KR102112888B1 - Blower device - Google Patents

Abstract

The outer surface 61 of the boss portion 60 of the propeller fan 50 has an upstream end 62, an upstream surface 64 extending toward the outer side in a rotational radial direction toward the downstream side, and an upstream surface ( It includes a downstream portion 67 positioned downstream of the downstream end 65 of 64, and a downstream surface 66 connecting the downstream end 65 and downstream portion 67 of the upstream surface 64. The downstream surface 66 has a shape extending along a direction parallel to the rotation axis 80.

Description

Blower device {BLOWER DEVICE}

The present invention relates to a blowing device, and more particularly, to a blowing device for rotating a propeller fan using a drive motor.

In Japanese Utility Model Publication No. Hei 05-088404 (Patent Document 1) and Japanese Patent Publication No. 2010-125134 (Patent Document 2), an invention relating to a hair dryer is disclosed. A blower such as a hair dryer includes a drive motor and a propeller fan. The propeller fan is attached to the output shaft of the drive motor. The propeller fan rotates by receiving rotational power from a drive motor, and generates airflow flowing from the suction port toward the discharge port.

Publication of Japanese Utility Model Publication No. 05-088404 Japanese Patent Publication No. 2010-125134

An object of the first and second inventions is to provide a blower capable of suppressing foreign matter such as hair or dust sucked with air from the intake port from being entangled with the output shaft of the drive motor. It is an object of the third invention to provide a blower capable of suppressing noise generation from a propeller fan.

A blowing device based on a certain aspect of the first aspect of the present invention includes a wind path forming member including an intake port and a discharge port, an output shaft, a driving motor installed inside the air path forming member, a boss portion attached to the output shaft, and the It includes a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor, and the propeller fan receives rotational power from the drive motor and rotates around an imaginary axis of rotation. Generates an air stream flowing from the suction port toward the discharge port on the downstream side, and the outer surface of the boss portion is continuous with the upstream end positioned most upstream and the upstream end and toward the downstream side. The upstream surface having a shape extending toward the outside in the radial direction of rotation of the propeller fan, and the upstream surface A downstream portion located on the downstream side of the downstream end, and a downstream surface connecting the downstream end and the downstream portion of the upstream surface, the downstream surface extending in a direction parallel to the rotation axis, or It has a shape that extends toward the inside of the rotational radial direction rather than the parallel direction as it goes toward the downstream portion.

A blowing device based on another aspect of the first aspect of the present invention includes a wind path forming member including an intake port and a discharge port, an output shaft, a driving motor installed inside the air path forming member, a boss portion attached to the output shaft, and the It includes a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor, and the propeller fan receives rotational power from the drive motor and rotates around an imaginary axis of rotation. Generates an air stream flowing from the suction port toward the discharge port on the downstream side, and the outer surface of the boss portion is located at the most upstream side, and has an upstream end having a planar shape, and is continuous at the outer edge of the upstream end. And the shape extending along a direction parallel to the rotation axis, or toward the downstream side An upstream surface having a shape extending toward an inner side in a rotational radial direction of the propeller fan than a parallel direction, a downstream portion located on the downstream side of a downstream end portion of the upstream surface, and the downstream end and the downstream portion of the upstream surface It includes a downstream surface for connecting, the downstream surface has a shape extending toward the inside of the radial direction of rotation than the parallel direction toward the downstream portion.

A blowing device based on a certain aspect of the second aspect of the present invention includes a wind path forming member including a suction port and a discharge port, an output shaft, a driving motor installed inside the air path forming member, a boss portion attached to the output shaft, and the It includes a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor, and the propeller fan receives rotational power from the drive motor and rotates around an imaginary axis of rotation. Generates an air flow flowing from the suction port toward the discharge port on the downstream side, and the wing portion includes a wing tip portion positioned at the tip in the rotational direction of the propeller fan, and from the blade tip portion to the outer surface of the boss portion. Extending, forming a front edge of the wing in the direction of rotation An edge portion, a trailing edge portion extending from the outer surface of the boss portion toward the outer side in the radial direction of rotation of the propeller fan, and forming a rear edge of the blade portion in the rotation direction, the blade tip portion and the trailing portion The outermost end of the wing portion in the direction parallel to the rotation axis, having an outer periphery connecting the outer end and forming an outer periphery of the wing portion in the radial direction of rotation, and the If the height dimension between the root position of the leading edge is ha, and the height dimension between the position of the most downstream side of the wing and the position of the tip of the wing is hb, the value of hb / ha is 1.5 or more.

A blowing device based on another aspect of the second aspect of the present invention includes a wind path forming member including a suction port and a discharge port, an output shaft, a drive motor installed inside the air path forming member, a boss portion attached to the output shaft, and the It includes a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor, and the propeller fan receives rotational power from the drive motor and rotates around an imaginary axis of rotation. Generates an air flow flowing from the suction port toward the discharge port on the downstream side, and the wing portion includes a wing tip portion positioned at the tip in the rotational direction of the propeller fan, and from the blade tip portion to the outer surface of the boss portion. Extending, forming a front edge of the wing in the direction of rotation An edge portion, a trailing edge portion extending from the outer surface of the boss portion toward the outer side in the radial direction of rotation of the propeller fan, and forming a rear edge of the blade portion in the rotation direction, the blade tip portion and the trailing portion The outer end portion is connected, and has an outer peripheral portion forming an outer periphery of the wing portion in the rotational radial direction, and the air passage forming member has an inner wall portion and a concave portion formed to be concave from the inner wall portion, and the rotating shaft In the direction parallel to, the most downstream side of the recess is located at the upstream side than the most downstream portion of the boss portion, and is located downstream of the wing tip portion of the wing portion, In the direction parallel to the axis of rotation, the most upstream portion of the recess is the wing It is located on the upstream side of the tip of the wing.

A blower device based on another aspect of the second aspect of the present invention includes a wind path forming member including a suction port and a discharge port, an output shaft, a driving motor installed inside the air path forming member, and a boss portion attached to the output shaft, and It includes a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor, the propeller fan receives rotational power from the drive motor and rotates up and down around a virtual axis of rotation. The air flow flowing from the suction port on the side toward the discharge port on the downstream side, and the wing portion includes the blade tip portion positioned at the tip of the propeller fan in the rotational direction, and the outer surface of the boss portion from the blade tip portion. Extending to form a front edge of the wing in the rotational direction A leading edge portion, a trailing edge portion extending from the outer surface of the boss portion toward the outer side in the radial direction of rotation of the propeller fan, and forming a rear edge of the wing portion in the rotational direction, the blade tip portion and the trailing edge portion The outer end of the blade is connected, and has an outer periphery forming an outer periphery of the wing in the rotational radial direction, and the air passage forming member is located on the downstream side of the first inner wall portion and the first inner wall portion. In the direction parallel to the rotation axis, the most upstream portion of the second inner wall portion is greater than the most downstream portion of the boss portion. It is located on the upstream side, and is located on the downstream side of the wing tip portion of the wing portion.

The blower according to the third aspect of the present invention includes a wind path forming member including a suction port and a discharge port, an output shaft, a drive motor installed inside the air path forming member, a boss portion attached to the output shaft, and the boss portion It includes a wing portion provided on the surface, and has a propeller fan disposed on the inlet side than the drive motor, and the propeller fan receives rotational power from the drive motor and rotates around an imaginary axis of rotation. Generates airflow flowing from the downstream side toward the discharge port, is disposed on the downstream side of the propeller fan, and further includes a rectifying blade having an upstream edge portion on the upstream side, wherein the wing portion is rotated in the direction of rotation of the propeller fan. The tip of the wing positioned at the tip of the edge, and the boss from the tip of the wing. The leading edge portion extending to the outer surface of the, forming the front edge of the wing portion in the rotation direction, and extending from the outer surface of the boss portion toward the outer side in the radial direction of rotation of the propeller fan, the rotating direction A trailing edge portion forming a rear edge of the wing portion, an outer edge portion connecting the wing tip portion and the outer edge portion of the trailing edge portion, and forming an outer periphery of the wing portion in the rotational radial direction; and Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade is in a direction parallel to the rotation axis toward one of them while looking at them in a direction perpendicular to the rotation axis in a state where they are opposed to each other. A gap is formed between them when virtually moving along and contacting each other When they are viewed in the parallel direction with respect to the rotation axis in a state in which the shapes and / or these are opposed to each other, they have a shape in which only a part of them intersect.

According to the first and second inventions, it is possible to obtain a blower capable of suppressing foreign matter such as hair or dust sucked with air from the intake port from being entangled with the output shaft of the drive motor. According to the third invention, it is possible to obtain a blower capable of suppressing the generation of noise from a propeller fan.

1 is a cross-sectional view showing a blowing device in Comparative Example 1.
FIG. 2 is an enlarged cross-sectional view of an area surrounded by line II in FIG. 1.
3 is a side view showing a propeller fan used in the blowing device in Comparative Example 1. FIG.
4 is a plan view showing a propeller fan used in the blower in Comparative Example 1.
5 is a cross-sectional view showing a state when the propeller fan used in the blower in Comparative Example 1 is rotating.
6 is a view schematically showing a state in which a part of air flowing along the outer surface of the boss portion used in the blower in Comparative Example 1 is sucked into the boss portion.
7 is a view schematically showing a state in which a part of air flowing along the outer surface of the boss portion used in the blower in the modification example of Comparative Example 1 is sucked into the boss portion.
8 is a view schematically showing a state in which a part of air flowing along the outer surface of the boss portion used in the blower device in another modification of Comparative Example 1 is sucked into the boss portion.
9 is a cross-sectional view showing a blowing device according to the first embodiment.
10 is an enlarged cross-sectional view of an area surrounded by X-rays in FIG. 9.
11 is a side view showing a propeller fan used in the blowing device according to the first embodiment.
12 is a plan view showing a propeller fan used in the blowing device according to the first embodiment.
13 is a cross-sectional view showing a state when the propeller fan used in the blowing device according to the first embodiment is rotating.
14 is a diagram schematically showing a state when the boss portion used in the blowing device in the first embodiment is rotating.
15 is a diagram schematically showing a boss portion in a first modification example of the first embodiment.
16 is a diagram schematically showing a boss portion in a second modification of the first embodiment.
17 is a diagram schematically showing a boss portion in a third modification of the first embodiment.
18 is a diagram schematically showing a boss portion in a fourth modification of the first embodiment.
19 is a diagram schematically showing a boss portion in a fifth modification of the first embodiment.
20 is a diagram schematically showing a boss portion in a sixth modification example of the first embodiment.
21 is a diagram schematically showing a boss portion in a seventh modification example of the first embodiment.
22 is a diagram schematically showing a boss portion in an eighth modification example of the first embodiment.
23 is a diagram schematically showing a boss portion in a ninth modification example of the first embodiment.
24 is a diagram schematically showing a boss portion in a tenth modification example of the first embodiment.
25 is a diagram schematically showing a boss portion in an eleventh modification example of the first embodiment.
26 is a diagram schematically showing a boss portion in a twelfth modification of the first embodiment.
27 is a diagram schematically showing a boss portion used in Experimental Example 1 according to the first embodiment.
28 is a diagram showing the conditions and results of Experimental Example 1 according to the first embodiment, and shows the relationship between the cabinet at the upstream end and the number of hairs rolled into the output shaft of the drive motor.
29 is a diagram showing the conditions and results of Experimental Example 1 according to the first embodiment, and shows the relationship between the value of h / (H + h) and the number of hairs rolled on the output shaft of the drive motor.
30 is a diagram schematically showing a boss portion used in Experimental Example 2 according to the first embodiment.
31 is a diagram showing the conditions and results of Experimental Example 2 according to the first embodiment, and shows the relationship between the value of h / (H + h) and the number of hairs rolled into the output shaft of the drive motor.
32 shows h / (H in the case of Experimental Example 2 according to the first embodiment, when the average value of the number of curled hairs is two, and the cabinet value of the upstream end portion and the average value of the number of curled hairs is two. It is a diagram showing the relationship between the values of + h).
33 is a side view showing a propeller fan used in the blower device in Comparative Example 2. FIG.
34 is a cross-sectional view showing a state when the propeller fan used in the blower in Comparative Example 2 is rotating.
35 is a side view showing a propeller fan used in the blowing device according to the second embodiment.
36 is a cross-sectional view showing a state when the propeller fan used in the blowing device according to the second embodiment is rotating.
37 is a diagram showing the conditions and results of Experimental Example 3 according to the second embodiment, and shows the relationship between the value of hb / ha and the number of hairs rolled on the output shaft of the drive motor.
38 is a diagram partially showing a blowing device used in Experimental Example 4 according to the second embodiment.
39 is a diagram showing the conditions and results of Experimental Example 4 according to the second embodiment.
40 is a plan view showing a propeller fan used in the blowing device in Comparative Example 3. FIG.
41 is a plan view showing a propeller fan according to the first modification example of the second embodiment.
42 is a plan view showing a state when the propeller fan according to the first modification example of the second embodiment is rotating.
43 is a diagram partially showing a blowing device according to a second modified example of the second embodiment.
44 is a diagram partially showing a blowing device according to a third modification example of the second embodiment.
Fig. 45 is a plan view showing a propeller fan and a rectifying blade in the third embodiment (showing a state in which the propeller fan is not attached to the drive motor).
46 is a plan view showing a propeller fan and a commutator blade in the third embodiment (showing a state in which the propeller fan is attached to the drive motor).
Fig. 47 is a plan view showing an enlarged area surrounded by the XK 'line in Fig. 46.
48 is a diagram showing the conditions and results of Experimental Example 5 according to the third embodiment.
49 is a plan view schematically showing a propeller fan and a rectifying blade in the first modification of the third embodiment.
50 is a plan view schematically showing a propeller fan and a commutator blade in a second modification of the third embodiment.
51 is a plan view schematically showing a propeller fan and a commutator blade in a third modification of the third embodiment.
Fig. 52 is a plan view schematically showing a propeller fan and a commutator blade in a fourth modified example of the third embodiment.
53 is a plan view schematically showing a propeller fan and a commutator blade in a fifth modified example of the third embodiment.
54 is a plan view schematically showing a propeller fan and a rectifying blade in a sixth modification of the third embodiment.
55 is a plan view schematically showing a propeller fan and a rectifying blade in a seventh modification of the third embodiment.
56 is a plan view schematically showing a wing portion of a propeller fan and an upstream edge portion of a rectifying blade in the eighth modification of the third embodiment.
57 is a plan view schematically showing a wing portion of a propeller fan and an upstream edge portion of a rectifying blade in a ninth modification of the third embodiment.
58 is a plan view schematically showing a wing portion of a propeller fan and an upstream edge portion of a rectifying blade in a tenth modification of the third embodiment.
59 is a plan view schematically showing a wing portion of a propeller fan and an upstream edge portion of a rectifying blade in the eleventh modification of the third embodiment.
60 is a plan view schematically showing a wing portion of a propeller fan and an upstream edge portion of a rectifying blade in a twelfth modification of the third embodiment.
61 is a plan view schematically showing a wing portion of a propeller fan and an upstream edge portion of a rectifying blade in a thirteenth modification of the third embodiment.
Fig. 62 is a plan view schematically showing a wing portion of a propeller fan and an upstream edge portion of a rectifying blade in a 14th modification of the third embodiment.
63 is a plan view schematically showing a wing portion of a propeller fan and an upstream edge portion of a rectifying blade in a fifteenth modification of the third embodiment.
64 is a plan view schematically showing a wing portion of a propeller fan and an upstream edge portion of a rectifying blade in a sixteenth modification of the third embodiment.
65 is a cross-sectional view showing a propeller fan and a rectifying blade in the fourth embodiment.
66 is an enlarged cross-sectional view of the propeller fan and rectifying blade in the fourth embodiment.
67 is a diagram showing the conditions and results of Experimental Example 6 according to the fourth embodiment.
68 is a cross-sectional view showing a propeller fan and a rectifying blade in the first modification of the fourth embodiment.
69 is a cross-sectional view showing a propeller fan and a rectifying blade in a second modification example of the fourth embodiment.
70 is a cross-sectional view showing a propeller fan and a rectifying blade in a third modification example of the fourth embodiment.
71 is a cross-sectional view showing a propeller fan and a rectifying blade in a fourth modified example of the fourth embodiment.
72 is a cross-sectional view showing a propeller fan and a rectifying blade in a fifth modified example of the fourth embodiment.
73 is a side view schematically showing a wing portion and a rectifying blade of a propeller fan according to a sixth modification example of the fourth embodiment.
74 is a side view schematically showing a wing portion and a rectifying blade of a propeller fan according to a seventh modification example of the fourth embodiment.
75 is a side view schematically showing a wing portion and a rectifying blade of a propeller fan according to an eighth modification example of the fourth embodiment.
76 is a side view schematically showing a wing portion and a rectifying blade of a propeller fan according to a ninth modification example of the fourth embodiment.
77 is a side view schematically showing a wing portion and a rectifying blade of a propeller fan according to a tenth modification example of the fourth embodiment.
78 is a side view schematically showing a wing portion and a rectifying blade of a propeller fan according to an eleventh modification of the fourth embodiment.
79 is a side view schematically showing a wing portion and a rectifying blade of a propeller fan according to a twelfth modification of the fourth embodiment.
80 is a side view schematically showing a wing portion and a rectifying blade of a propeller fan according to a thirteenth modification example of the fourth embodiment.
81 is a side view schematically showing a wing portion and a rectifying blade of a propeller fan according to a fourth modified example of the fourth embodiment.

[Comparative Example 1]

Before explaining each embodiment and each experimental example based on this invention, the comparative example 1 which concerns on this invention is demonstrated. In the description of this comparative example, the same reference numerals are given to the same parts and equivalent parts, and overlapping descriptions may not be repeated.

(Blowing device 100)

1 is a cross-sectional view showing a blowing device 100 in this comparative example. The blower device 100 includes a main body portion 10 and a gripping portion 20. The gripping portion 20 is a portion gripped by a user. On the surface of the gripping portion 20, an operation portion 23 is provided. The distal end portion 21 of the gripping portion 20 is rotatably attached to the main body portion 10. A power cord 24 is provided at the rear end portion 22 of the gripping portion 20.

The main body portion 10 includes an outer case 11, an inner case 12, a driving motor 30, a propeller fan 50Z, a rectifying blade 40Z, and a heater 17. The outer case 11 and the inner case 12 each have a substantially cylindrical shape. The outer case 11 has an inlet opening 13 and an outlet opening 14. The inlet opening 13 communicates with the outlet opening 14, and an air passage is formed between the inlet opening 13 and the outlet opening 14.

The inner case 12 as the air passage forming member is disposed inside the outer case 11. The inner case 12 has an inlet 15 and an outlet 16. In the state in which the inner case 12 is disposed inside the outer case 11, the suction port 15 is located on the side of the inlet opening 13 of the outer case 11, and the discharge port 16 is the outer case 11 ) Is located on the outlet opening 14 side.

The driving motor 30, the propeller fan 50Z, and the rectifying blade 40Z are installed inside the inner case 12. The motor support part 44 (refer FIG. 2) is provided inside the rectifying blade 40Z. The drive motor 30 is supported by a motor support 44. The drive motor 30 is arranged such that its output shaft 31 (see FIG. 2) is substantially parallel to the longitudinal direction of the main body 10.

The propeller fan 50Z is attached to the drive motor 30. The propeller fan 50Z is disposed on the suction port 15 side rather than the drive motor 30. The propeller fan 50Z is arranged such that the rotational axis of the propeller fan 50Z (refer to the rotational axis 80 in FIG. 2) is substantially parallel to the longitudinal direction of the main body 10. The driving motor 30 rotates the propeller fan 50Z by being supplied with electric power through the power cord 24.

The propeller fan 50Z receives rotational power from the drive motor 30 and rotates around the rotational shaft, and the inlet opening 13 on the upstream side and the outlet 16 and outlet opening 14 on the downstream side from the inlet 15 ) To generate air flow (air flow). The heater 17 is disposed on the outlet opening 14 side than the propeller fan 50Z.

FIG. 2 is an enlarged cross-sectional view of an area surrounded by line II in FIG. 1. For convenience of illustration, the cross-sectional view of FIG. 2 is illustrated such that the intake port 15 is located above the ground and the discharge port 16 is located below the ground. As described above, the driving motor 30, the propeller fan 50Z, and the rectifying blade 40Z are installed inside the inner case 12. The motor support part 44 is provided inside the rectifying blade 40Z.

The motor support 44 has a peripheral wall 44A, a bottom wall 44B, and a hole 44C. The peripheral wall 44A has a cylindrical shape. The central axis of the peripheral wall 44A and the central axis of the inner case 12 are located substantially on the same straight line. The bottom wall 44B has a disk shape and is provided so as to close the end portion on the upstream side of the peripheral wall 44A. The hole 44C is provided in the center of the bottom wall 44B. When the drive motor 30 is fitted inside the peripheral wall 44A, the output shaft 31 of the drive motor 30 protrudes from the hole 44C toward the upstream side.

The rectifying blade 40Z is disposed downstream from the propeller fan 50Z. The rectifying blade 40Z includes a plate-shaped portion 42. The plate-shaped portion 42 extends radially from the outer surface of the motor support portion 44 (peripheral wall 44A) toward the outside. The plate-shaped portions 42 are arranged at intervals in the circumferential direction so as not to lower the flow rate of the air flow flowing from the suction port 15 toward the discharge port 16. The plate-shaped portion 42 has an upstream edge portion 43 on the upstream side. The upstream edge portion 43 of this comparative example has a planar shape and extends in a direction perpendicular to the rotation axis 80 of the propeller fan 50Z.

(Propeller fan (50Z))

3 is a side view showing the propeller fan 50Z. 4 is a plan view showing the propeller fan 50Z. The propeller fan 50Z is integrally produced as a resin molded article by, for example, synthetic resin such as AS (acrylonitrile-styrene) resin. The propeller fan 50Z receives rotational power from the drive motor 30 (see FIG. 2) and rotates in the direction of the arrow AR1 around the rotation shaft 80 (see FIG. 3).

2 to 4, the propeller fan 50Z includes a boss portion 60Z and seven wing portions 70Z. The propeller fan 50Z in this comparative example has a shape of rotational symmetry. The rotational symmetry described herein is a rotation angle of 2π / n radians (n is a positive integer, n = 7 in this comparative example) when the propeller fan 50Z is rotated around the rotation axis 80. It means the property that the same figure is repeated. The propeller fan 50Z rotates one of the wing portions 70Z around the rotation axis 80 at a rotation angle of 360/7 = about 51.4 °, and then another wing portion 70Z adjacent to the wing portion 70Z. ).

(Boss part (60Z))

The boss unit 60Z rotates in the direction of the arrow AR1 around the virtual rotation axis 80 by receiving rotational power from the drive motor 30. The boss portion 60Z includes an outer surface 61, an inner surface 68, and a bearing portion 69. The boss portion 60Z has a rotationally symmetrical shape as a whole, and the outer surface 61 of the boss portion 60Z has a hemispherical shape as a whole. An upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan 50Z is rotating, the rotating shaft 80 is formed to pass through the upstream end 62.

A mainstream surface 63 is formed at an intermediate position of the outer surface 61 in a direction parallel to the rotation shaft 80. The mainstream surface 63 has a shape of a hemispherical surface continuous to the upstream end 62, and extends so as to expand in diameter toward the outside in the radial direction of rotation of the propeller fan 50Z as it faces the downstream side. A downstream portion 67 is formed at a position on the outermost side of the outermost surface 61. The downstream portion 67 is located at the downstream end of the main surface 63. When the downstream portion 67 is viewed in a plan view (see FIG. 4), the downstream portion 67 has a circular shape.

The inner surface 68 of the boss portion 60Z is formed inside the outer surface 61. The bearing portion 69 has a cylindrical shape and is installed at a central position of the inner surface 68. The bearing part 69 is a part which connects the propeller fan 50Z to the output shaft 31 (refer FIG. 2) of the drive motor 30 (refer FIG. 2).

(Wing part (70Z))

The seven blades 70Z are provided on the outer surface 61 of the boss portion 60Z, and have a shape extending from the outer surface 61 toward the outside in the rotational radial direction of the propeller fan 50Z. The seven-wing part 70Z has the same shape. The seven-wing part 70Z is arrange | positioned at equal intervals in the rotation direction (arrow AR1 direction) of the propeller fan 50Z.

When the seven blades 70Z rotate in the direction of the arrow AR1 around the rotation shaft 80, the seven blades 70Z rotate integrally with the boss portion 60Z. The air flows from the intake port 15 (see FIG. 2) to the discharge port 16 (see FIG. 2) by rotating the seven blades 70Z around the rotation shaft 80 (from the upper side in FIG. 3 to the lower side). Airflow).

3 and 4, the wing portion 70Z includes a wing tip portion 71, a leading edge portion 72, a root portion 73, a trailing edge portion 74, a wing trailing edge portion 75, and an outer peripheral portion 76 ). The blade tip portion 71 is located at the most distal end (front side) in the rotation direction (arrow AR1 direction) of the propeller fan 50Z. The leading edge portion 72 extends from the wing tip portion 71 to the outer surface 61 of the boss portion 60Z, and forms the leading edge portion of the wing portion 70Z in the rotation direction. The leading edge portion 72 of this comparative example extends so as to almost follow the direction perpendicular to the rotational axis 80 of the propeller fan 50Z (see Fig. 3). The root portion 73 is formed between the wing portion 70Z and the outer surface 61 of the boss portion 60Z (boundary line).

The trailing edge portion 74 extends from the outer surface 61 of the boss portion 60Z toward the outside in the radial direction of rotation, and the wing portion 70Z in the rotation direction (arrow AR1 direction) of the propeller fan 50Z Form the rear edge of the. In the case where the propeller fan 50Z is viewed from the direction orthogonal to the rotating shaft 80 (that is, when the propeller fan 50Z is viewed from the side), the trailing edge portion 74 of this comparative example is a propeller fan 50Z It extends along a direction perpendicular to the rotation axis 80 of (see Fig. 3). The blade rear end portion 75 is formed at the outermost end portion (outer end portion) of the trailing edge portion 74 in the radial direction of rotation. The outer periphery portion 76 connects the blade tip portion 71 and the blade rear end portion 75 to form an outer periphery of the blade portion 70Z in the radial direction of rotation.

More specifically, the wing portion 70Z has a sickle shape with the wing tip portion 71 as the tip. The wing portion 70Z has a shape in which the width in the direction along the rotational direction between the leading edge portion 72 and the trailing edge portion 74 gradually decreases as it faces the inner side in the radial direction of rotation. In other words, the wing portion 70Z has a shape in which the width in the direction along the rotational direction between the leading edge portion 72 and the trailing edge portion 74 gradually increases as it goes outward in the radial direction of rotation.

The leading edge portion 72 is located in the front side of the rotation direction (arrow AR1 direction) of the wing portion 70Z, and forms the leading edge portion of the wing portion 70Z in the rotation direction. In the case where the propeller fan 50Z is viewed in a direction parallel to the rotation axis 80 (that is, when the propeller fan 50Z is viewed in a plane), the leading edge portion 72 is rotated among the root portions 73 With the front end portion as the starting point, it extends in a substantially linear shape from the inside in the radial direction to the outside in the same direction. As described above, in the case where the propeller fan 50Z is viewed from the direction orthogonal to the rotating shaft 80 (that is, when the propeller fan 50Z is viewed from the side), the leading edge portion 72 of this comparative example is: The propeller fan 50Z extends substantially in a direction perpendicular to the rotational axis 80 (see FIG. 3).

The blade tip portion 71 is located at the most distal end (front side) of the blade portion 70Z in the rotational direction (arrow AR1 direction), and at the outermost side of the rotational radial direction in the leading edge portion 72. Located. The wing tip portion 71 is a portion where the leading edge portion 72 and the outer peripheral portion 76 are connected, and is a portion where the radius of curvature is minimized between the leading edge portion 72 and the outer peripheral portion 76.

The trailing edge portion 74 is located on the rear side of the rotation direction (arrow AR1 direction) of the wing portion 70Z, and forms a rear edge of the wing portion 70Z in the rotation direction. In the case where the propeller fan 50Z is viewed in a direction parallel to the rotational shaft 80 (that is, when the propeller fan 50Z is viewed in a plane), the trailing edge portion 74 is rotated in the root portion 73 With the rear end portion as a starting point, it extends in a substantially linear shape from the inside in the radial direction to the outside in the same direction. As described above, in the case where the propeller fan 50Z is viewed from the direction orthogonal to the rotation shaft 80 (that is, when the propeller fan 50Z is viewed from the side), the trailing edge portion 74 of this comparative example is: It extends in a linear shape along a direction perpendicular to the rotation axis 80 of the propeller fan 50Z (see Fig. 3).

The blade rear end portion 75 is located at the outermost side in the radial direction of rotation in the trailing edge portion 74. The wing rear end portion 75 is a portion where the trailing edge portion 74 and the outer peripheral portion 76 are connected, and is a portion where the radius of curvature is minimized between the trailing edge portion 74 and the outer peripheral portion 76. In the propeller fan 50Z of this comparative example, the wing front end portion 71 and the wing rear end portion 75 are located substantially on the same circle.

The outer periphery 76 extends along the rotational direction of the wing portion 70Z (the circumferential direction centering on the rotation axis 80), and is installed to connect between the wing tip portion 71 and the blade rear end portion 75 do. The outer peripheral edge portion 76 of this comparative example extends in a circular arc shape between the blade tip portion 71 and the blade trailing portion 75 as a whole. In other words, when the propeller fan 50Z is viewed in a direction parallel to the rotational axis 80 (that is, when the propeller fan 50Z is viewed in a plane), the rotational axis 80 (upstream end 62 and wing) The dimension between the tip portion 71 and the dimension between the rotating shaft 80 (upstream end portion 62) and the blade rear end portion 75 are set to the same value.

The wing tip portion 71, the leading edge portion 72, the root portion 73, the trailing edge portion 74, the trailing edge portion 75, and the outer peripheral portion 76 form a periphery of the wing portion 70Z. A wing surface of the wing portion 70Z is formed on the entire inner side of the area surrounded by the periphery. The wing surface of the wing portion 70Z has a shape in which the leading edge portion 72 is located upstream in the direction in which the airflow flows, and the trailing edge portion 74 is located in the downstream side in the direction in which the airflow flows. . In other words, as the wing surface of the wing portion 70Z is directed from the leading edge portion 72 to the trailing edge portion 74, the suction port 15 (see FIG. 2) side to the discharge port 16 (see FIG. 2) side It is formed so as to be smoothly curved as a whole (see FIG. 3).

When the propeller fan 50Z is rotating, a positive pressure surface is formed on a surface of the wing surface of the wing portion 70Z on the discharge port 16 side, and a negative pressure surface is formed on a surface of the suction port 15 of the wing surface. . When the propeller fan 50Z is rotating, the wing surface of the wing portion 70Z generates airflow flowing from the suction port 15 toward the discharge port 16. When the propeller fan 50Z is rotating, as air flow occurs on the wing surface, a pressure distribution that is relatively large in the positive pressure surface and relatively small in the negative pressure surface occurs.

5 is a cross-sectional view showing a state when the propeller fan 50Z is rotating. The propeller fan 50Z receives rotational power from the drive motor 30, rotates in the direction of the arrow AR1, and generates air flow (see arrow DR1) flowing from the inlet 15 to the outlet 16. As indicated by arrow DR1, air flow from the intake port 15 flows from the upstream side to the downstream side while following the wing surface of the wing portion 70Z and the outer surface 61 of the boss portion 60Z.

As the wing portion 70Z rotates, a wing tip vortex is generated in the vicinity of the wing tip portion 71 (see FIGS. 3 and 4) of the wing portion 70Z (see arrow DR3). This blade tip vortex is generated so that the vicinity of the blade tip portion 71 is the tip, and extends toward the rear side in the rotational direction (arrow AR1 direction).

On the other hand, when the propeller fan 50Z is rotating, the air existing inside the boss portion 60Z is also rotated by the inner surface 68 of the boss portion 60Z. Centrifugal force is generated in the air existing inside the boss portion 60Z as it rotates. Negative pressure is generated in the vicinity of the downstream portion 67 of the boss portion 60Z by air flowing through the space where the centrifugal force is generated and the space where the wing portion 70Z is not provided around the boss portion 60Z. . A vortex (see arrow DR2) is generated in the vicinity of the downstream portion 67 of the boss portion 60Z by the action of this negative pressure.

As indicated by the arrow DR2, a part of the air (arrow DR1) flowing along the outer surface 61 receives the action of this vortex and changes direction around the downstream portion 67 of the boss portion 60Z, and It flows toward the surface 68 to be sucked into the interior of the boss portion 60Z.

6 is a diagram schematically showing a state in which a part of air flowing along the outer surface 61 is sucked into the inside of the boss portion 60Z. As indicated by the arrow DR4 in FIG. 6, since the outer surface 61 of the boss portion 60Z has a hemispherical shape as a whole, part of the air flowing along the outer surface 61 is a boss portion 60Z. The direction changes around the downstream portion 67 of the flow, and flows to be sucked inside the boss portion 60Z.

When the blowing device 100 (see FIG. 1) is being used, foreign matter such as hair or dust may be sucked in with air from the inlet opening 13 (see FIG. 1) inside the blowing device 100. Foreign matter, such as hair, is carried by the air flow indicated by the arrow DR4 (see FIG. 6) and sucked inside the boss portion 60Z. When foreign matter such as hair is entangled in the output shaft 31 of the driving motor 30, not only the blowing efficiency is lowered, but also foreign matter such as hair may cause a malfunction.

(Boss part (60ZA))

Referring to FIG. 7, the same phenomenon as described above may also occur in the boss portion 60ZA. The outer surface 61 of the boss portion 60ZA has a cylindrical shape as a whole. The outer surface 61 of the boss portion 60ZA includes an upstream end 62, a mainstream surface 63, and a downstream portion 67. The upstream end 62 is located at the most upstream side of the boss portion 60ZA, and has a planar shape. The mainstream surface 63 is continuous to the outer edge of the upstream end 62 and has a shape extending along a direction parallel to the rotation axis 80. The downstream portion 67 is located at the downstream end of the main surface 63.

When the propeller fan is rotating, the air existing inside the boss portion 60ZA is also rotated by the inner surface of the boss portion 60ZA. Centrifugal force is generated in the air existing inside the boss portion 60ZA as it is rotated. A negative pressure is generated in the vicinity of the downstream portion 67 of the boss portion 60ZA by the air through which the centrifugal force is generated and the air flowing through the space where the wing portion is not provided around the boss portion 60ZA. In the vicinity of the downstream portion 67 of the boss portion 60ZA, a vortex is generated by the action of this negative pressure.

As indicated by arrow DR4, since the outer surface 61 of the boss portion 60ZA has a cylindrical shape as a whole, a part of the air flowing along the outer surface 61 is a downstream portion of the boss portion 60ZA. The direction is changed around (67) and flows to be sucked into the interior of the boss portion (60ZA). Foreign matter, such as hair, may be carried by the air flow indicated by the arrow DR4 and sucked inside the boss portion 60ZA, and may be entangled with the output shaft 31 of the drive motor 30.

(Boss part (60ZB))

Referring to Fig. 8, the same phenomenon as described above may also occur in the boss portion 60ZB. The outer surface 61 of the boss portion 60ZB has a shape of a conical surface as a whole. The outer surface 61 of the boss portion 60ZB includes an upstream end 62, a mainstream surface 63, and a downstream portion 67. The upstream end 62 is located at the most upstream side of the boss portion 60ZB. The mainstream surface 63 continues to the upstream end 62 and extends so as to expand in diameter toward the outside in the radial direction of rotation as it faces the downstream side. The downstream portion 67 is located at the downstream end of the main surface 63.

When the propeller fan is rotating, the air existing inside the boss portion 60ZB is also rotated by the inner surface of the boss portion 60ZB. Centrifugal force is generated in the air existing inside the boss portion 60ZB as it is rotated. A negative pressure is generated in the vicinity of the downstream portion 67 of the boss portion 60ZB by the air through which the centrifugal force is generated and the air flowing through the space where the wing portion is not provided around the boss portion 60ZB. A vortex is generated in the vicinity of the downstream portion 67 of the boss portion 60ZB by the action of this negative pressure.

As indicated by the arrow DR4, since the outer surface 61 of the boss portion 60ZB has a conical shape as a whole, a part of the air flowing along the outer surface 61 is a downstream portion of the boss portion 60ZB ( 67), the direction changes, and flows to be sucked into the interior of the boss portion 60ZB. Foreign matter, such as hair, may be carried by the air flow indicated by the arrow DR4 and sucked inside the boss portion 60ZB, and may be entangled with the output shaft 31 of the drive motor 30.

[Embodiment]

Hereinafter, each embodiment and each experimental example based on this invention are demonstrated, referring drawings. In the description of each embodiment and each experimental example, when referring to the number and amount, etc., the scope of the present invention is not necessarily limited to the number and the amount, etc., unless otherwise specified. In the description of each embodiment and each experimental example, the same reference numerals are given to the same parts and corresponding parts, and overlapping descriptions may not be repeated. Unless otherwise specified, it is intended from the beginning to use a combination of the structures shown in each embodiment and the structures shown in each experimental example as appropriate.

[Embodiment 1]

(Blow device 200)

9 is a cross-sectional view showing a blowing device 200 according to the present embodiment. The blower device 200 includes a main body portion 10 and a gripping portion 20. The gripping portion 20 is a portion gripped by a user. On the surface of the gripping portion 20, an operation portion 23 is provided. The distal end portion 21 of the gripping portion 20 is rotatably attached to the main body portion 10. A power cord 24 is provided at the rear end portion 22 of the gripping portion 20.

When using the blower device 200, the main body portion 10 and the gripping portion 20 generally form an approximately T-shaped or approximately L-shaped shape. When receiving the blower device 200, the gripping portion 20 may rotate to a position along the main body portion 10. When the grip portion 20 is folded, the blower device 200 can be easily accommodated.

The main body portion 10 includes an outer case 11, an inner case 12, a driving motor 30, a propeller fan 50, a rectifying blade 40, and a heater 17. The outer case 11 and the inner case 12 each have a substantially cylindrical shape. The outer case 11 has an inlet opening 13 and an outlet opening 14. The inlet opening 13 communicates with the outlet opening 14, and an air passage is formed between the inlet opening 13 and the outlet opening 14.

The inner case 12 as the air passage forming member is disposed inside the outer case 11. The inner case 12 has an inlet 15 and an outlet 16. In the state in which the inner case 12 is disposed inside the outer case 11, the suction port 15 is located on the side of the inlet opening 13 of the outer case 11, and the discharge port 16 is of the outer case 11 It is located on the outlet opening 14 side.

The drive motor 30, the propeller fan 50, and the rectifying blade 40 are installed inside the inner case 12. Inside the rectifying blade 40, a motor support 44 (see Fig. 10) is provided. The drive motor 30 is supported by a motor support 44. The drive motor 30 is arranged such that its output shaft 31 (see FIG. 10) is substantially parallel to the longitudinal direction of the main body 10.

The propeller fan 50 is attached to the drive motor 30. The propeller fan 50 is disposed on the suction port 15 side rather than the drive motor 30. The propeller fan 50 is disposed such that the rotational axis of the propeller fan 50 (refer to the rotational axis 80 in FIG. 10) is substantially parallel to the longitudinal direction of the main body 10. The driving motor 30 is supplied with electric power through the power cord 24, thereby rotating the propeller fan 50.

The propeller fan 50 receives rotational power from the drive motor 30 and rotates around the rotation shaft, and the inlet opening 13 on the upstream side and the outlet 16 and outlet opening 14 on the downstream side from the inlet 15 A flow of air (air flow) is generated. The heater 17 is disposed on the outlet opening 14 side than the propeller fan 50.

The operating state of the heater 17 is switched by operating the operation unit 23. When the heater 17 is ON, warm air is blown out from the outlet opening 14. When the heater 17 is in the OFF state, cold air is blown out from the outlet opening 14. The operating state of the heater 17 may include a mode in which the ON state and the OFF state are periodically switched. By changing the temperature of the wind blown out from the outlet opening 14 over time, it becomes possible to cool the heated scalp with cold air, trim the heated and spread hair, form a cuticle on the hair, or the like.

10 is an enlarged cross-sectional view of an area surrounded by X-rays in FIG. 9. For convenience in the illustration, the cross-sectional view of FIG. 10 is illustrated such that the intake port 15 is located above the ground and the discharge port 16 is located below the ground. As described above, the driving motor 30, the propeller fan 50, and the rectifying blade 40 are installed inside the inner case 12. A motor support 44 is installed inside the rectifying blade 40.

The motor support 44 has a peripheral wall 44A, a bottom wall 44B, a hole 44C, and an annular wall 46. The peripheral wall 44A has a cylindrical shape. The central axis of the peripheral wall 44A and the central axis of the inner case 12 are located substantially on the same straight line. The bottom wall 44B has a disk shape and is provided so as to close the end portion on the upstream side of the peripheral wall 44A. The hole 44C is provided at the center of the bottom wall 44B. When the drive motor 30 is fitted inside the peripheral wall 44A, the output shaft 31 of the drive motor 30 protrudes from the hole 44C toward the upstream side. The annular wall 46 is provided on the surface on the upstream side of the bottom wall 44B, and surrounds the periphery of the output shaft 31 at a distance from the output shaft 31.

The rectifying blade 40 is disposed downstream of the propeller fan 50. The rectifying wing 40 includes a plate-shaped portion 42. The plate-shaped portion 42 extends radially from the outer surface of the motor support portion 44 (peripheral wall 44A) toward the outside. The plate-shaped portions 42 are arranged at intervals in the circumferential direction so as not to lower the flow rate of the air flow flowing from the suction port 15 toward the discharge port 16. The plate-shaped portion 42 has an upstream edge portion 43 on the upstream side. The upstream edge portion 43 of the present embodiment has a planar shape and extends in a direction perpendicular to the rotation axis 80 of the propeller fan 50.

(Propeller fan 50)

11 is a side view showing the propeller fan 50. 12 is a plan view showing the propeller fan 50. The propeller fan 50 is integrally produced as a resin molded article by, for example, a synthetic resin such as AS (Acrylonitrile-Styrene) resin. The propeller fan 50 receives rotational power from the drive motor 30 (see FIG. 10) and rotates in the direction of the arrow AR1 around the rotation shaft 80 (see FIG. 11).

10 to 12, the propeller fan 50 includes a boss portion 60 and three wings 70. The propeller fan 50 in this embodiment has a shape of rotation symmetry. The rotational symmetry described herein is a rotation angle of 2π / n radians (n is a positive integer and n = 3 in this embodiment) when the propeller fan 50 is rotated around the rotation axis 80. It means the property that the same figure is repeated. When the propeller fan 50 rotates one of the wing parts 70 around the rotation axis 80 at a rotation angle of 360/3 = 120 °, another wing part 70 adjacent to the wing part 70 Has the property of overlapping.

The propeller fan 50 may be manufactured, for example, by twisting a sheet of sheet metal, or may be made of an integral thin object formed with a curved surface. In these cases, the propeller fan may have a structure in which three wing portions 70 are joined to the separately formed boss portion 60. The propeller fan 50 may be provided with the wing part 70 of several sheets other than three sheets, or may be provided with the wing part 70 of only one piece. When the propeller fan 50 is provided with only one wing portion 70, a weight as a balancer may be installed on the opposite side of the wing portion 70 with respect to the rotating shaft 80.

(Boss part (60))

The boss unit 60 rotates in the direction of the arrow AR1 around the virtual rotation shaft 80 by receiving rotational power from the drive motor 30. The boss portion 60 includes an outer surface 61, an inner surface 68 and a bearing portion 69. The boss portion 60 has a shape of rotational symmetry as a whole.

The outer surface 61 of the boss portion 60 includes an upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, a downstream surface 66, and a downstream portion 67. The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan 50 is rotating, the rotation shaft 80 is formed to pass through the upstream end 62. The upstream surface 64 has a shape of a substantially conical surface continuous to the upstream end 62, and extends so as to expand in diameter toward the outside in the radial direction of rotation of the propeller fan 50 toward the downstream side.

The shape of the substantially conical surface described herein means a shape of a surface in which the cross-sectional shape in the direction along the rotation axis 80 of the upstream surface 64 is substantially straight. The substantially conical surface also includes a case in which the portion near the upstream end 62 of the upstream surface 64 and the portion near the downstream end 65 of the upstream surface 64 are appropriately curved. The shape of the upstream surface 64 may be formed so as to be curved as a whole, as long as it extends toward the outer side in the radial direction of rotation of the propeller fan 50 as it faces the downstream side, and the conical surface is close to the axis. The shape curved in the direction and the shape curved in the direction away from the axis are also included in the "approximately conical surface".

In other words, the outer surface 61 of the boss portion 60 may be formed to be curved from the upstream surface 64 toward the downstream surface 66, and bent from the upstream surface 64 toward the downstream surface 66. It may be formed. The shape of the upstream surface 64 has the shape of a hemispherical surface continuous to the upstream end 62 and rotates the propeller fan 50 as it faces the downstream side (downstream end 65 of the upstream surface 64). You may extend so that it may expand in diameter toward the radially outer side.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. When the downstream end 65 of the upstream surface 64 is viewed in a plan view (see FIG. 12), the downstream end 65 of the upstream surface 64 has a circular shape. The downstream portion 67 (see FIG. 11) is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this embodiment is located on the most downstream side as a whole of the outer surface 61. The outer surface 61 may have another portion on the downstream side of the downstream portion 67.

The downstream surface 66 is formed to connect the downstream end 65 of the upstream surface 64 and the downstream portion 67. The downstream face 66 of the present embodiment has a cylindrical shape as a whole and extends along a direction parallel to the rotation shaft 80. The inner surface 68 of the boss portion 60 is formed inside the outer surface 61. The bearing portion 69 has a cylindrical shape and is provided at a central position on the inner surface 68. The bearing part 69 is a part which connects the propeller fan 50 to the output shaft 31 (refer FIG. 10) of the drive motor 30 (refer FIG. 10).

10, when the propeller fan 50 is attached to the output shaft 31 of the drive motor 30, in the direction parallel to the rotation shaft 80, the bottom wall 44B of the motor support 44 ) And the output shaft 31 are located on the upstream side of the most downstream portion (downstream portion 67) of the boss portion 60. In other words, the portion of the motor support portion 44 near the bottom wall 44B, the bottom wall 44B, and the output shaft 31 are arranged to be covered by the inner surface 68 of the boss portion 60.

(Wing part (70))

The three wing portions 70 are provided on the outer surface 61 of the boss portion 60 and have a shape extending from the outer surface 61 toward the outside in the rotational radial direction of the propeller fan 50. The three wings 70 have the same shape. The three blades 70 are arranged at equal intervals in the rotational direction of the propeller fan 50 (arrow AR1 direction).

When the three blades 70 rotate in the direction of the arrow AR1 around the rotation axis 80, the three blades 70 rotate integrally with the boss portion 60. The air flows from the intake port 15 (see FIG. 10) to the discharge port 16 (see FIG. 10) by rotating the three blades 70 around the rotation shaft 80 (from the upper side in FIG. 11 to the lower side). Air flow).

11 and 12, the wing portion 70 includes a wing tip portion 71, a leading edge portion 72, a root portion 73, a trailing edge portion 74, a wing rear end portion 75, and an outer peripheral portion 76 ). The wing tip portion 71 is located at the most distal end (front side) in the rotation direction (arrow AR1 direction) of the propeller fan 50. The leading edge portion 72 extends from the tip end portion 71 of the wing to the outer surface 61 of the boss portion 60, and forms the leading edge portion of the wing portion 70 in the rotational direction. The leading edge portion 72 of the present embodiment extends from the outer surface 61 of the boss portion 60 toward the outer side in the rotational radial direction (see FIG. 11). The root portion 73 is formed between the wing portion 70 and the outer surface 61 of the boss portion 60 (border line).

The trailing edge portion 74 extends from the outer surface 61 of the boss portion 60 toward the outside in the radial direction of rotation, and the wing portion 70 in the rotational direction of the propeller fan 50 (arrow AR1 direction) Form the rear edge of the. The trailing edge portion 74 of this embodiment extends from the outer surface 61 of the boss portion 60 toward the outside in the rotational radial direction slightly toward the front side (see FIG. 11). The blade rear end portion 75 is formed at the outermost end portion (outer end portion) of the trailing edge portion 74 in the radial direction of rotation. The outer periphery portion 76 connects the blade tip portion 71 and the blade rear portion 75 to form an outer periphery of the blade portion 70 in the rotational radial direction.

More specifically, the wing portion 70 has a pointed shape in a sickle shape with the tip end portion 71 of the wing. The wing portion 70 has a shape in which the width in the direction along the rotational direction between the leading edge portion 72 and the trailing edge portion 74 decreases relatively rapidly as it faces the inner side in the radial direction of rotation. In other words, the wing portion 70 has a shape in which the width in the direction along the rotational direction between the leading edge portion 72 and the trailing edge portion 74 increases relatively rapidly as it faces outward in the radial direction of rotation.

The leading edge portion 72 is located on the front side of the blade portion 70 in the rotational direction (arrow AR1 direction), and forms the leading edge portion of the blade portion 70 in the rotational direction. In the case where the propeller fan 50 is viewed from a direction parallel to the rotation axis 80 (that is, when the propeller fan 50 is viewed in a plane), the leading edge portion 72 is rotated in the root portion 73 With the front end portion as the starting point, the outer surface 61 of the boss portion 60 extends toward the front side in the rotational direction as it goes outward in the rotational radial direction. In the case where the propeller fan 50 is viewed from the direction orthogonal to the rotational shaft 80 (that is, when the propeller fan 50 is viewed from the side), the leading edge portion 72 of the present embodiment is the root portion 73 ), Starting from the front end portion in the rotational direction, and extending from the outer surface 61 of the boss portion 60 to the outside in the rotational radial direction, extends toward the upstream side in the direction in which the airflow flows (FIG. 11) Reference).

The blade tip portion 71 is located at the most distal end (front side) of the blade portion 70 in the rotational direction (arrow AR1 direction), and at the outermost side of the rotational radial direction in the leading edge portion 72. Located. The wing tip portion 71 is a portion where the leading edge portion 72 and the outer peripheral portion 76 are connected, and is a portion where the radius of curvature is minimized between the leading edge portion 72 and the outer peripheral portion 76.

The trailing edge portion 74 is located on the rear side of the blade portion 70 in the rotational direction (arrow AR1 direction), and forms a rear edge of the blade portion 70 in the rotational direction. In the case where the propeller fan 50 is viewed in a direction parallel to the rotation axis 80 (that is, when the propeller fan 50 is viewed in a plane), the trailing edge portion 74 is rotated among the root portions 73 With the rear end portion as the starting point, it extends from the inside in the radial direction toward the outside in the same direction. In the case where the propeller fan 50 is viewed from the direction orthogonal to the rotating shaft 80 (in other words, when the propeller fan 50 is viewed from the side), the trailing edge portion 74 of the present embodiment includes the root portion 73 ), From the outer surface 61 of the boss portion 60 toward the outside in the radial direction of rotation, with the rear end in the rotational direction as the starting point, extends slightly toward the upstream side in the direction in which the air flows (Fig. 11).

The blade rear end portion 75 is located at the outermost side in the radial direction of rotation in the trailing edge portion 74. The wing rear end portion 75 is a portion to which the trailing edge portion 74 and the outer peripheral portion 76 are connected, and is a portion where the radius of curvature is minimized between the trailing edge portion 74 and the outer peripheral portion 76.

The outer periphery portion 76 extends along the rotational direction of the wing portion 70 (a peripheral direction centered on the rotation shaft 80), and is installed to connect between the wing tip portion 71 and the blade rear end portion 75 do. The outer periphery portion 76 of this embodiment extends substantially in a circular arc shape between the blade tip portion 71 and the blade trailing portion 75 as a whole. In the case where the propeller fan 50 is viewed in a direction parallel to the rotational shaft 80 (that is, when the propeller fan 50 is viewed in a plane), the rotational shaft 80 (upstream end 62 and wing tip 71 )) Is smaller than the dimension between the rotating shaft 80 (upstream end 62 and blade rear end 75).

The wing tip portion 71, the leading edge portion 72, the root portion 73, the trailing edge portion 74, the trailing edge portion 75, and the outer peripheral portion 76 form a periphery of the wing portion 70. A wing surface of the wing portion 70 is formed on the entire inner side of the area surrounded by the periphery. The wing surface of the wing portion 70 has a shape in which the leading edge portion 72 is located on the upstream side in the direction in which the air flows, and the trailing edge portion 74 is located on the downstream side in the direction in which the air flows. . In other words, as the wing surface of the wing portion 70 faces the trailing edge portion 74 from the leading edge portion 72, the discharge port 16 (see Fig. 10) side from the suction port 15 (see Fig. 10) side. It is formed so as to be smoothly curved as a whole (see FIG. 11).

When the propeller fan 50 is rotating, a positive pressure surface is formed on the surface of the wing surface side of the wing surface of the wing portion 70, and a negative pressure surface is formed on the surface of the suction port 15 of the wing surface. . When the propeller fan 50 is rotating, the wing surface of the wing portion 70 generates airflow flowing from the suction port 15 toward the discharge port 16. When the propeller fan 50 is rotating, as the air flow occurs on the wing surface, a pressure distribution that is relatively large in the positive pressure surface and relatively small in the negative pressure surface occurs.

(Actions and effects)

13 is a cross-sectional view showing a state when the propeller fan 50 is rotating. 14 is a diagram schematically showing a state when the boss portion 60 is rotating. 13 and 14, the propeller fan 50 receives rotational power from the drive motor 30 (see FIG. 10), rotates in the direction of the arrow AR1, and discharges from the intake port 15 (see FIG. 10) ( 16) A flow of air (see arrow DR5) is generated toward (see FIG. 10). As indicated by the arrow DR5, air flow from the intake port 15 flows from the upstream side to the downstream side, along the wing surface of the wing portion 70 and the outer surface 61 of the boss portion 60.

The air flowing through the space where the wing portion 70 is not provided around the boss portion 60 flows along the upstream surface 64 of the outer surface 61 on the upstream side. On the other hand, the air flowing through the space where the wing portion 70 is not provided around the boss portion 60 does not blur so as to follow the downstream surface 66 of the outer surface 61 on the downstream side, and the outer surface Under the action of the centrifugal force from 61, it peels off from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion 70 is not provided around the boss portion 60 flows outward in the radial direction of rotation from the outer surface 61 on the downstream side (see arrow DR5).

As the air flows in the direction of the arrow DR5, a vortex indicated by the arrow DR6 occurs between the flow of the air and the downstream face 66 of the boss portion 60. This vortex occurs when a part of the air is separated from the air flowing in the direction of the arrow DR5, and the separated part of the air is subjected to the action of centrifugal force from the outer surface 61. Most of this vortex is generated at a position on the upstream side of the downstream portion 67 of the boss portion 60. This vortex does not change in direction around the downstream portion 67 of the boss portion 60, and does not flow to be sucked into the interior of the boss portion 60 toward the inner surface 68 side.

When the blowing device 200 (see FIG. 9) is being used, foreign matter such as hair or dust may be sucked in with air from the inlet opening 13 (see FIG. 9) inside the blowing device 200. When the hair sucked from the inlet opening 13 (see FIG. 9) is hair on the body, the hair stays in place without being entangled with the output shaft 31 of the drive motor 30. The hair can be easily pulled out from the inside of the blower 200 by being pulled upstream.

In the case where the hair sucked from the inlet opening 13 (see Fig. 9) is hair, foreign matter such as hair flows on the downstream side as it is carried by the air flow indicated by the arrow DR5 (see Figs. 13 and 14). There is almost no foreign matter such as hair entangled with the output shaft 31 of the drive motor 30. Therefore, according to the blower apparatus 200 (refer FIG. 1) of this embodiment, it is possible to effectively suppress that the blowout efficiency is not lowered and that a failure is caused by foreign matter such as hair.

As described above (see FIG. 10), when the propeller fan 50 is attached to the output shaft 31 of the drive motor 30, in the direction parallel to the rotation shaft 80, the bottom wall of the motor support 44 The 44B and the output shaft 31 are located on the upstream side of the most downstream side portion (downstream portion 67) of the boss portion 60. In other words, the portion of the motor support portion 44 near the bottom wall 44B, the bottom wall 44B, and the output shaft 31 are arranged to be covered by the inner surface 68 of the boss portion 60. It is further suppressed that foreign matter such as hair is entangled with the output shaft 31.

(First modification)

15 is a diagram schematically showing the boss portion 60A in the first modification of the first embodiment. The outer surface 61 of the boss portion 60A includes an upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, a downstream surface 66, and a downstream portion 67. The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the upstream end 62. The upstream surface 64 has a shape of a substantially conical surface continuous to the upstream end 62, and extends so as to expand in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60A is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream face 66 of this modification has a conical shape as a whole, and extends toward the inner side in the radial direction of rotation rather than in a direction parallel to the rotation shaft 80 as it faces the downstream portion 67.

In other words, the external shape of the portion including the downstream surface 66 of the boss portion 60A has a shape of a substantially truncated cone that shrinks in diameter as it faces the downstream portion 67. The shape of a truncated cone means a three-dimensional shape of a conical shape obtained by dividing the cone in a plane parallel to the bottom surface, and not the cone. The shape of the substantially truncated cone described herein means not only the shape of the side surface (the shape of the downstream surface 66) that is substantially straight, but also the vicinity of the downstream end 65 of the downstream surface 66. Also included is the case where the portion near the downstream portion 67 of the portion and / or the downstream surface 66 is appropriately curved. The shape of the downstream surface 66 of the present modified example may be formed so as to be curved as a whole, if it extends so as to decrease in diameter toward the inner side in the rotational radial direction toward the downstream side, the downstream surface 66 is close to the rotation axis. A shape curved in a direction to be curved, and a shape curved in a direction away from the rotational axis of the downstream face 66 are also included in the "approximate shape of a truncated cone".

When the propeller fan is rotating, airflow from the intake port flows as indicated by arrow DR5. The air flowing through the space where the wing portion is not provided around the boss portion 60A flows along the upstream surface 64 of the outer surface 61 on the upstream side, and on the downstream side the outer surface 61. It does not flow to follow the downstream face 66 of, and peels off the outer surface 61 in the vicinity of the downstream end 65 of the upstream face 64. The air flowing through the space where the wing portion is not provided around the boss portion 60A flows outward in the radial direction of rotation from the outer surface 61 on the downstream side (see arrow DR5).

As the air flows in the direction of the arrow DR5, a vortex as indicated by the arrow DR6 occurs between the air flow and the downstream surface 66 of the boss portion 60A. Most of this vortex is generated at a position upstream of the downstream portion 67 of the boss portion 60A. This vortex does not change direction around the downstream portion 67 of the boss portion 60A, and does not flow to be sucked into the interior of the boss portion 60A. Therefore, even when the boss portion 60A is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(Second modification)

16 is a diagram schematically showing the boss portion 60B1 in the second modified example of the first embodiment. The outer surface 61 of the boss portion 60B1 includes an upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, a downstream surface 66, and a downstream portion 67. The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the upstream end 62. The upstream surface 64 has a shape of a substantially conical surface continuous to the upstream end 62, and extends so as to expand in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60B1 is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream face 66 of this modification has a first downstream face 66A and a second downstream face 66B. The first downstream surface 66A extends in a direction orthogonal to the rotation shaft 80. The second downstream surface 66B has a shape of a cylindrical surface continuous to the first downstream surface 66A, and extends in a direction parallel to the rotation shaft 80. As a whole of the downstream surface 66, it extends while bending toward the inside of the rotational radial direction rather than in a direction parallel to the rotation shaft 80 as it goes toward the downstream portion 67.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60B1 flows along the upstream surface 64 of the outer surface 61 on the upstream side, and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60B1 flows outward in the radial direction of rotation from the outer surface 61 on the downstream side.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60B1. Most of this vortex occurs at a position upstream of the downstream portion 67 of the boss portion 60B1. This vortex does not change direction around the downstream portion 67 of the boss portion 60B1, and does not flow to be sucked inside the boss portion 60B1. Therefore, even when the boss portion 60B1 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(Third variant)

17 is a diagram schematically showing the boss portion 60B2 in the third modification example of the first embodiment. The outer surface 61 of the boss portion 60B2 includes an upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, a downstream surface 66, and a downstream portion 67. The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the upstream end 62. The upstream surface 64 has a shape of a substantially hemispherical surface continuous to the upstream end 62, and extends so as to extend in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60B2 is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream surface 66 of this modification has a shape of a substantially conical surface that continues to the downstream end 65 of the upstream surface 64 and rotates more than the direction parallel to the rotation axis 80 as it faces the downstream portion 67 It extends linearly to shrink in diameter toward the inner side in the radial direction.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60B2 flows along the upstream surface 64 of the outer surface 61 on the upstream side and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60B2 flows outward in the rotational radial direction from the outer surface 61 on the downstream side.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60B2. Most of this vortex is generated at a position upstream of the downstream portion 67 of the boss portion 60B2. This vortex does not change direction around the downstream portion 67 of the boss portion 60B2, and does not flow to be sucked inside the boss portion 60B2. Therefore, even when the boss portion 60B2 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(Fourth modification)

18 is a diagram schematically showing the boss portion 60B3 in the fourth modification of the first embodiment. The outer surface 61 of the boss portion 60B3 includes an upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, a downstream surface 66, and a downstream portion 67. The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the upstream end 62. The upstream surface 64 has a shape of a substantially hemispherical surface continuous to the upstream end 62, and extends so as to extend in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60B3 is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream face 66 of this modification has a first downstream face 66A and a second downstream face 66B. The first downstream surface 66A extends in a direction orthogonal to the rotation shaft 80. The second downstream surface 66B has a shape of a cylindrical surface continuous to the first downstream surface 66A, and extends in a direction parallel to the rotation shaft 80. As a whole of the downstream surface 66, it extends while bending toward the inside of the rotational radial direction rather than in a direction parallel to the rotation shaft 80 as it goes toward the downstream portion 67.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60B3 flows along the upstream surface 64 of the outer surface 61 on the upstream side, and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60B3 flows outward in the radial direction of rotation from the outer surface 61 on the downstream side.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60B3. Most of this vortex is generated at a position on the upstream side of the downstream portion 67 of the boss portion 60B3. This vortex does not change direction around the downstream portion 67 of the boss portion 60B3, and does not flow to be sucked inside the boss portion 60B3. Therefore, even when the boss portion 60B3 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(Fifth modification)

19 is a diagram schematically showing the boss portion 60B4 in the fifth modification of the first embodiment. The outer surface 61 of the boss portion 60B4 includes an upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, a downstream surface 66, and a downstream portion 67. The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the upstream end 62. The upstream surface 64 has a shape of a substantially hemispherical surface continuous to the upstream end 62, and extends so as to extend in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60B4 is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream surface 66 of this modification extends in an arc shape toward the inside of the rotational radial direction rather than the direction parallel to the rotation axis 80 as it faces the downstream portion 67. The downstream surface 66 of this modification has an arc shape that is concave inward as it faces the downstream portion 67.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60B4 flows along the upstream surface 64 of the outer surface 61 on the upstream side and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60B4 flows outward in the rotational radial direction from the outer surface 61 on the downstream side.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60B4. Most of this vortex is generated at a position upstream of the downstream portion 67 of the boss portion 60B4. This vortex does not change direction around the downstream portion 67 of the boss portion 60B4, and does not flow to be sucked inside the boss portion 60B4. Therefore, even when the boss portion 60B4 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(Sixth modification)

20 is a diagram schematically showing the boss portion 60C in the sixth modification of the first embodiment. The outer surface 61 of the boss portion 60C includes an upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, a downstream surface 66, and a downstream portion 67. The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the upstream end 62. The upstream surface 64 has a shape of a substantially hemispherical surface continuous to the upstream end 62, and extends so as to extend in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60C is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream face 66 of this modification has a first downstream face 66A and a second downstream face 66B. The first downstream surface 66A extends in an arc shape toward the inside of the rotational radial direction rather than in a direction parallel to the rotation axis 80 as it faces the downstream side. The first downstream face 66A of this modification has an arc-shaped shape that convexes outward as it faces the downstream side. The second downstream surface 66B extends in a direction parallel to the rotation axis 80 with the downstream end of the first downstream surface 66A as a starting point, and further on the downstream side, a direction parallel to the rotation axis 80 Rather, it extends in an arc shape toward the inside in the radial direction of rotation. The downstream portion of the second downstream surface 66B of this modification has an arcuate shape that convexes outward as it faces the downstream side.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60C flows along the upstream surface 64 of the outer surface 61 on the upstream side, and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60C flows on the downstream side in the radial direction outside of the outer surface 61.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60C. Most of this vortex is generated at a position on the upstream side of the downstream portion 67 of the boss portion 60C. This vortex does not change direction around the downstream portion 67 of the boss portion 60C, and does not flow to be sucked into the interior of the boss portion 60C. Therefore, even when the boss portion 60C is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(Seventh modification)

21 is a diagram schematically showing the boss portion 60D1 in the seventh modification example of the first embodiment. The outer surface 61 of the boss portion 60D1 has an upstream end 62, an outer rim 62T of the upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, and a downstream surface (66) and a downstream portion (67). The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61 and has a planar shape. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the center of the upstream end 62. The upstream surface 64 has a shape of a substantially conical surface continuous to the outer edge 62T of the upstream end 62, and extends so as to expand in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side. .

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60D1 is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream face 66 of this modification has a first downstream face 66A and a second downstream face 66B. The first downstream surface 66A extends in a direction orthogonal to the rotation shaft 80. The second downstream surface 66B has a shape of a cylindrical surface continuous to the first downstream surface 66A, and extends in a direction parallel to the rotation shaft 80. As a whole of the downstream surface 66, it extends while bending toward the inside of the rotational radial direction rather than in a direction parallel to the rotation shaft 80 as it goes toward the downstream portion 67.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60D1 flows along the upstream surface 64 of the outer surface 61 on the upstream side and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60D1 flows on the downstream side in the radial direction outside of the outer surface 61.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60D1. Most of this vortex occurs at a position upstream of the downstream portion 67 of the boss portion 60D1. This vortex does not change direction around the downstream portion 67 of the boss portion 60D1, and does not flow to be sucked into the boss portion 60D1. Therefore, even when the boss portion 60D1 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(Example 8)

22 is a diagram schematically showing the boss portion 60D2 in the eighth modification example of the first embodiment. The outer surface 61 of the boss portion 60D2 includes an upstream end 62, an outer rim 62T of the upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, and a downstream surface (66) and a downstream portion (67). The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61 and has a planar shape. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the center of the upstream end 62. The upstream surface 64 has a shape of a substantially conical surface continuous to the outer edge 62T of the upstream end 62, and extends so as to expand in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side. .

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60D2 is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream surface 66 of this modification extends in an arc shape toward the inside of the rotational radial direction rather than in a direction parallel to the rotation axis 80 as it faces the downstream side. The downstream surface 66 of this modification has an arc-shaped shape that convexes outward as it faces the downstream side.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60D2 flows along the upstream surface 64 of the outer surface 61 on the upstream side and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60D2 flows outward in the rotational radial direction from the outer surface 61 on the downstream side.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60D2. Most of this vortex is generated at a position upstream of the downstream portion 67 of the boss portion 60D2. This vortex does not change direction around the downstream portion 67 of the boss portion 60D2, and does not flow to be sucked into the boss portion 60D2. Therefore, even when the boss portion 60D2 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(9th modification)

23 is a diagram schematically showing the boss portion 60D3 in the ninth modification example of the first embodiment. The outer surface 61 of the boss portion 60D3 has an upstream end 62, an outer rim 62T of the upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, and a downstream surface (66) and a downstream portion (67). The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61 and has a planar shape. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the center of the upstream end 62. The upstream surface 64 has a shape of a substantially conical surface continuous to the outer edge 62T of the upstream end 62, and extends so as to expand in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side. .

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream surface 66 of the boss portion 60D3 is also formed to connect the downstream end 65 of the upstream surface 64 and the downstream portion 67. The downstream surface 66 of this modification extends in an arc shape toward the inside of the rotational radial direction rather than in a direction parallel to the rotation axis 80 as it faces the downstream side. The downstream surface 66 of this modification has an arc shape that is concave inward as it faces the downstream side.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60D3 flows along the upstream surface 64 of the outer surface 61 on the upstream side and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60D3 flows on the downstream side in the radial direction outside of the outer surface 61.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60D3. Most of this vortex occurs at a position upstream of the downstream portion 67 of the boss portion 60D3. This vortex does not change direction around the downstream portion 67 of the boss portion 60D3, and does not flow to be sucked into the boss portion 60D3. Therefore, even when the boss portion 60D3 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(Third modification)

24 is a diagram schematically showing the boss portion 60E1 in the tenth modification example of the first embodiment. The outer surface 61 of the boss portion 60E1 includes an upstream end 62, an outer edge 62T of the upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, and a downstream surface (66) and a downstream portion (67). The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61 and has a planar shape. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the center of the upstream end 62. The upstream surface 64 has a shape of a substantially cylindrical surface continuous to the outer edge 62T of the upstream end 62 and extends in a direction parallel to the rotation axis 80.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60E1 is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream surface 66 of the present modification has a shape of a substantially conical surface that continues to the downstream end 65 of the upstream surface 64, and rotates in the radial direction rather than in a direction parallel to the rotation axis 80 as it faces the downstream side. It extends in a linear shape to shrink in diameter toward the inside.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60E1 flows along the upstream surface 64 of the outer surface 61 on the upstream side and on the downstream side. In, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60E1 flows outward in the rotational radial direction from the outer surface 61 on the downstream side.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60E1. Most of this vortex occurs at a position upstream of the downstream portion 67 of the boss portion 60E1. The vortex does not change direction around the downstream portion 67 of the boss portion 60E1, and does not flow to be sucked into the boss portion 60E1. Therefore, even when the boss portion 60E1 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(11th modified example)

25 is a diagram schematically showing the boss portion 60E2 in the eleventh modification example of the first embodiment. The outer surface 61 of the boss portion 60E2 includes an upstream end 62, an outer edge 62T of the upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, and a downstream surface (66) and a downstream portion (67). The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61 and has a planar shape. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the center of the upstream end 62. The upstream surface 64 has a shape of a substantially cylindrical surface continuous to the outer edge 62T of the upstream end 62, and extends along a direction parallel to the rotation axis 80 as it faces the downstream side.

The downstream end 65 of the upstream surface 64 is formed at the position of the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60E2 is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream face 66 of this modification has a first downstream face 66A and a second downstream face 66B. The first downstream surface 66A extends in a direction orthogonal to the rotation shaft 80. The second downstream surface 66B has a shape of a substantially conical surface continuous to the first downstream surface 66A, and as it faces the downstream side, the diameter toward the inside of the rotational radial direction is higher than the direction parallel to the rotation axis 80. It extends in a straight line to shrink. As a whole of the downstream surface 66, it extends while bending toward the inside of the rotational radial direction rather than in a direction parallel to the rotation shaft 80 as it goes toward the downstream portion 67.

When the propeller fan is rotating, the air flowing through the space where the wing portion is not provided around the boss portion 60E2 flows along the upstream surface 64 of the outer surface 61 on the upstream side and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60E2 flows outward in the rotational radial direction from the outer surface 61 on the downstream side.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60E2. Most of this vortex occurs at a position upstream of the downstream portion 67 of the boss portion 60E2. This vortex does not change direction around the downstream portion 67 of the boss portion 60E2, and does not flow to be sucked inside the boss portion 60E2. Therefore, even when the boss portion 60E2 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

(12th modified example)

26 is a diagram schematically showing the boss portion 60E3 in the twelfth modification of the first embodiment. The outer surface 61 of the boss portion 60E3 has an upstream end 62, an outer edge 62T of the upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, and a downstream surface (66) and a downstream portion (67). The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61 and has a planar shape. When the propeller fan is rotating, the rotating shaft 80 is formed to pass through the center of the upstream end 62. The upstream surface 64 has the shape of a substantially conical surface that continues to the outer edge 62T of the upstream end 62, and as it faces the downstream side, the inner side of the rotational radius direction is larger than the direction parallel to the rotation axis 80. It extends in a linear shape to shrink in diameter toward it.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this modified example is located at the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60E3 is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream face 66 of this modification has a first downstream face 66A and a second downstream face 66B. The first downstream surface 66A extends in a direction orthogonal to the rotation shaft 80. The second downstream surface 66B has a shape of a cylindrical surface continuous to the first downstream surface 66A, and extends in a direction parallel to the rotation shaft 80. As a whole of the downstream surface 66, it extends while bending toward the inside of the rotational radial direction rather than in a direction parallel to the rotation shaft 80 as it goes toward the downstream portion 67.

When the propeller fan is rotating, air flowing through the space where the wing portion is not provided around the boss portion 60E3 flows along the upstream surface 64 of the outer surface 61 on the upstream side and downstream. On the side, it does not flow to follow the downstream surface 66 of the outer surface 61, and peels from the outer surface 61 in the vicinity of the downstream end 65 of the upstream surface 64. The air flowing through the space where the wing portion is not provided around the boss portion 60E3 flows outward in the rotational radial direction from the outer surface 61 on the downstream side.

A vortex is generated between the air flow and the downstream face 66 of the boss portion 60E3. Most of this vortex occurs at a position upstream of the downstream portion 67 of the boss portion 60E3. This vortex does not change direction around the downstream portion 67 of the boss portion 60E3, and does not flow so as to be sucked inside the boss portion 60E3. Therefore, even when the boss portion 60E3 is used, it is possible to effectively suppress the occurrence of a failure caused by foreign matter such as hair because the blowing efficiency does not decrease.

[Experimental Example 1]

27 to 29, Experimental Example 1 and its results according to Embodiment 1 (FIGS. 9 to 14) described above will be described. In this experimental example, a boss portion 60F as shown in Fig. 27 was used. The boss portion 60F has a shape substantially the same as that of the boss portion 60 (see FIG. 14) in the first embodiment. Specifically, the outer surface 61 of the boss portion 60F includes an upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, a downstream surface 66, and a downstream portion 67 It includes.

The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan is rotating, a rotating shaft 80 (not shown) is formed to pass through the upstream end 62. The upstream surface 64 has a shape of a substantially conical surface continuous to the upstream end 62, and extends so as to expand in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this experimental example is located on the most downstream side as a whole of the outer surface 61. The downstream face 66 of the boss portion 60F is also formed to connect the downstream end 65 of the upstream face 64 and the downstream portion 67. The downstream surface 66 of the present experimental example has a shape of a cylindrical surface continuous to the downstream end 65 of the upstream surface 64 and extends in a direction parallel to the rotation axis 80.

The upstream end 62 of the boss portion 60F has an inner angle θ1. The upstream surface 64 of the boss portion 60F has a height dimension H in a direction parallel to the rotation shaft 80 (not shown). The downstream surface 66 of the boss portion 60F has a height dimension h in a direction parallel to the rotation shaft 80 (not shown). The downstream surface 66 of the boss portion 60F has an outer diameter D1. In this experimental example, the inner angle θ1 and the height dimension H were treated as variable values (see FIGS. 28 and 29). The height dimension h and the outer diameter D1 were treated as fixed values. The value of the height dimension h is 10 mm, and the value of the outer diameter D1 is 40 mm.

The inner angle θ1 of the upstream end 62 was changed from 0 ° to 170 °, and accordingly, the height dimension H of the upstream surface 64 was also changed. A propeller fan having a plurality of types of boss portions 60F having different inner angles θ1 was prepared, and the propeller fan was placed in a cylindrical case together with a drive motor. While rotating the propeller fan, 1000 hairs were flowed from the upstream side to the downstream side. The operation of shedding 1000 hairs for each propeller fan was repeated 5 times, and the average number of hairs rolled into the output shaft of the drive motor was calculated.

The line L1 in Fig. 28 shows the relationship between the inner angle θ1 and the number of hairs rolled into the output shaft of the drive motor. The horizontal axis in FIG. 28 represents the inner angle θ1 of the upstream end 62 of the boss portion 60F. The vertical axis in Fig. 28 represents the average number of hairs rolled into the output shaft of the drive motor. This average value is an average value when the operation of shedding 1000 hairs is repeated 5 times.

As shown in line L1, it can be seen that as the value of the inner angle θ1 is increased from 10 °, the curling of the hair is rapidly decreased. It can be seen that when the cabinet angle θ1 is 50 ° or more, curling of the hair hardly occurs. Accordingly, it can be seen that the inner angle θ1 at the upstream end 62 of the boss portion 60F may be 50 ° or more.

Line L2 in FIG. 29 represents the relationship between the value of h / (H + h) and the number of hairs rolled into the output shaft of the drive motor. The horizontal axis in FIG. 29 represents a value obtained by dividing the height dimension h of the downstream surface 66 by (height dimension H + height dimension h). This height dimension H is the height dimension H of the upstream surface 64 obtained when the inner angle θ1 of the upstream end 62 is changed from 0 ° to 170 °. The value of h / (H + h) is the height dimension of the downstream surface 66 occupied in the total height (H + h) of the boss portion 60F in the direction parallel to the rotation shaft 80 (not shown) It is the ratio of h. The vertical axis in Fig. 29 shows the average value of the number of hairs rolled into the output shaft of the drive motor. This average value is an average value when the operation of shedding 1000 hairs is repeated 5 times.

As indicated by the line L2, it can be seen that as the value of h / (H + h) is increased from 0.05, the curling of the hair decreases rapidly. It can be seen that when h / (H + h) is 0.2 or more, curling of the hair hardly occurs. Therefore, it turns out that the value of h / (H + h) should just be 0.2 (= 1/5) or more. In other words, it can be seen that the ratio of the height dimension h of the downstream face 66 occupied among the total heights H + h of the boss portion 60F may be 1/5 or more.

In addition, even if the value of the inner angle θ1 is less than 50 °, the height dimension h of the downstream surface 66 is secured to some extent, so that curling of the hair can be suppressed. Even if the height dimension h of the downstream surface 66 is less than 1/5 of the total height, if the inner angle θ1 has a certain value and the flow has a shape to peel off the outer surface 61, the curling of the hair is It can be suppressed. Therefore, the characteristics of the inner angle θ1 and the characteristics of h / (H + h) may be applied independently to the boss portion 60F.

[Experimental Example 2]

30 and 31, Experimental Example 2 and its results according to Embodiment 1 (FIGS. 9 to 14) described above will be described. In this experimental example, a boss portion 60G as shown in Fig. 30 was used. The boss portion 60G has a shape substantially the same as that of the boss portion 60 (see FIG. 14) in the first embodiment. Specifically, the outer surface 61 of the boss portion 60G includes an upstream end 62, an upstream surface 64, a downstream end 65 of the upstream surface 64, a downstream surface 66, and a downstream portion 67 It includes.

The upstream end 62 is formed at the position of the most upstream side (vertex) of the outer surface 61. When the propeller fan is rotating, a rotating shaft 80 (not shown) is formed to pass through the upstream end 62. The upstream surface 64 has a shape of a substantially conical surface continuous to the upstream end 62, and extends so as to expand in diameter toward the outside in the radial direction of rotation of the propeller fan as it faces the downstream side.

The downstream end 65 of the upstream surface 64 is formed at the position on the most downstream side of the upstream surface 64. The downstream portion 67 is located further downstream than the downstream end 65 of the upstream surface 64. The downstream portion 67 of this experimental example is located on the most downstream side as a whole of the outer surface 61. The downstream surface 66 of the boss portion 60G is also formed to connect the downstream end 65 of the upstream surface 64 and the downstream portion 67. The downstream surface 66 of the present experimental example has a shape of a cylindrical surface continuous to the downstream end 65 of the upstream surface 64 and extends in a direction parallel to the rotation axis 80.

The upstream end 62 of the boss portion 60G has an inner angle θ2. The upstream surface 64 of the boss portion 60G has a height dimension H in a direction parallel to the rotation shaft 80 (not shown). The downstream surface 66 of the boss portion 60G has a height dimension h in a direction parallel to the rotation shaft 80 (not shown). The downstream surface 66 of the boss portion 60G has an outer diameter D2. In this experimental example, the values of the inner angle θ2 were set to three types of 150 °, 98 °, and 60 ° (see FIG. 31). The value of the outer diameter D2 is 40 mm (fixed value).

When the value of the inner angle θ2 is 150 °, the value of the height dimension H is 5.36 mm. When the value of the inner angle θ2 is 98 °, the value of the height dimension H is 17.39 mm. When the value of the inner angle θ2 is 60 °, the value of the height dimension H is 34.64 mm. The height dimension h was treated as a variable value (see FIG. 31).

A propeller fan having three types of boss portions 60G having an internal angle θ2 of 150 °, 98 °, and 60 ° was prepared, and the propeller fan was placed in a cylindrical case together with a drive motor. While rotating the propeller fan, 1000 hairs were flowed from the upstream side to the downstream side. For each propeller fan, the operation of shedding 1000 hairs was repeated 5 times, and the average value of the number of hairs rolled into the output shaft of the drive motor was calculated.

Line L3 in FIG. 31 shows the relationship between the value of h / (H + h) and the number of hairs rolled into the output shaft of the drive motor when the value of the inner angle θ2 is 150 °. The line L4 in Fig. 31 shows the relationship between the value of h / (H + h) and the number of hairs rolled into the output shaft of the drive motor when the value of the inner angle θ2 is 98 °. Line L5 in FIG. 31 shows the relationship between the value of h / (H + h) and the number of hairs rolled into the output shaft of the drive motor when the value of the inner angle θ2 is 60 °. The horizontal axis in Fig. 29 represents the value obtained by dividing the height dimension h of the downstream surface 66 by the height dimension H + height dimension h. The vertical axis in FIG. 31 represents the average value of the number of hairs rolled into the output shaft of the drive motor. This average value is an average value when the operation of shedding 1000 hairs is repeated 5 times.

As shown in lines L3 to L5, it can be seen that as the value of h / (H + h) is increased from 0.05, the curling of the hair is rapidly decreased. It can be seen that when h / (H + h) is 0.2 or more, curling of the hair hardly occurs. Therefore, it turns out that the value of h / (H + h) should just be 0.2 (= 1/5) or more. In other words, it can be seen that the ratio of the height dimension h of the downstream face 66 occupied among the total heights H + h of the boss portion 60G may be 1/5 or more.

On the other hand, as shown in lines L3 to L5, as the value of h / (H + h) is made larger, it can be seen that the number of curled hairs is slightly increased. With reference to the line L3, when the value of the inner angle θ2 is 150 °, when the value of h / (H + h) exceeds 0.88, the average value of the number of curled hairs becomes two or more. With reference to the line L4, when the value of the inner angle θ2 is 98 °, if the value of h / (H + h) exceeds 0.63, the average value of the number of curled hairs is two or more. With reference to the line L5, when the value of the inner angle θ2 is 60 °, if the value of h / (H + h) exceeds 0.37, the average value of the number of curled hairs is two or more.

Fig. 32 is a diagram showing the relationship between the value of the inner angle θ2 when the average number of curled hairs is two, and the value of h / (H + h) when the average number of curled hairs is two. As shown in Fig. 32, the value of the inner angle θ2 when the average value of the number of curled hairs is two, and the value of h / (H + h) when the average value of the number of curled hairs is two are approximately It can be seen that it is changing linearly. Line L6 in FIG. 32 shows the relationship between the value of the inner angle θ2 when the average number of curled hairs is two, and the value of h / (H + h) when the average value of the curled hairs is two. It is an approximate straight line. This approximation curve is expressed by the expression "h / (H + h) = 0.0501 x Cabinet θ2max + 0.0056", and the determination coefficient is 0.989.

Therefore, the ratio of the height dimension h of the downstream surface 66 occupied in the total height H + h of the boss portion 60G may be 1/5 or more, and the hair is rolled into the output shaft of the drive motor. When it is desired to further suppress, it can be seen that it is more preferable that the maximum value of the cabinet θ2 is set so that the relationship expressed by the expression “h / (H + h) = 0.0501 × Cabinet θ2max + 0.0056” holds.

[Comparative Example 2]

(Propeller fan (50Z1))

33, the propeller fan 50Z1 in this comparative example is demonstrated. The propeller fan 50Z1 includes a boss portion 60Z1 and a wing portion 70Z1. The propeller fan 50Z1 has substantially the same shape as the propeller fan 50Z (see FIGS. 3 and 5) in Comparative Example 1 described above.

In the direction parallel to the rotation shaft 80, the wing portion 70Z1 of the propeller fan 50Z1 has a height dimension haz and a height dimension hbz. The height dimension haz is in the direction parallel to the rotation shaft 80, at the most downstream position in the wing portion 70Z1 (the position of the trailing edge portion 74 in the wing portion 70Z1), and the leading edge portion It is the dimension between the positions of the base 72H of 72. The height dimension hbz is a dimension between the position of the most downstream side in the blade portion 70Z1 and the position of the blade tip portion 71 in the direction parallel to the rotation shaft 80.

As described in Comparative Example 1 described above, the leading edge portion 72 of this comparative example extends so as to substantially follow the direction perpendicular to the rotation axis 80 of the propeller fan 50Z1. In the wing portion 70Z1, the value of hbz / haz is 1.05.

34 is a cross-sectional view showing a state when the propeller fan 50Z1 is rotating. The propeller fan 50Z1 receives rotational power from the drive motor 30, rotates in the direction of the arrow AR1, and generates airflow (see arrow DR1) flowing from the inlet 15 to the outlet 16. As indicated by the arrow DR1, the air flow from the intake port 15 flows from the upstream side to the downstream side while following the wing surface of the wing portion 70Z1 and the outer surface 61 of the boss portion 60Z1.

As described in Comparative Example 1 described above, as the blade portion 70Z1 rotates, a blade tip vortex is generated in the vicinity of the blade tip portion 71 of the blade portion 70Z1 (see arrow DR3). This blade tip vortex is generated so that the vicinity of the blade tip portion 71 is the tip, and extends toward the rear side in the rotational direction (arrow AR1 direction).

The position of the wing tip portion 71 of the wing portion 70Z1 is closer to the position of the downstream end portion of the wing portion 70Z1 (the position of the trailing edge portion 74 is closer to that of the second embodiment described later). Therefore, in the propeller fan 50Z1, between the position where the blade tip vortex is indicated by arrow DR3 and the position where the vortex occurs near the downstream end (rear edge 74) of the wing portion 70Z1 indicated by arrow DR2. The distance is short.

In the propeller fan 50Z1, the width W10 of the air passage through which the air from the suction port 15 can flow smoothly toward the discharge port 16 is narrow, and the incident angle θ10 of the air to the inner wall surface of the inner case 12 is larger or larger It is. The angle of incidence θ10 described herein means an angle formed between the direction in which the air flows and the inner wall surface of the inner case 12 when the air from the inlet 15 contacts the inner wall surface of the inner case 12. do.

When air from the intake port 15 contacts the inner wall surface of the inner case 12, the flow toward the outer side in the radial direction of rotation collides against the inner wall surface of the inner case 12 and is reflected. The air flowing along the outer surface 61 is carried by the flow from the reflected outside to flow back into the inside. Therefore, when the propeller fan 50Z1 provided with the wing portion 70Z1 is used, it is difficult to restrain foreign matter such as hair from being entangled with the output shaft 31 of the drive motor 30.

[Embodiment 2]

(Propeller fan (50H))

35, the propeller fan 50H in this embodiment is demonstrated. The propeller fan 50H includes a boss portion 60H and a wing portion 70H. The propeller fan 50H has a shape substantially the same as that of the propeller fan 50 in the first embodiment described above (see FIG. 11).

In the direction parallel to the rotation axis 80, the wing portion 70H of the propeller fan 50H has a height dimension ha and a height dimension hb. The height dimension ha is in the direction parallel to the rotating shaft 80, at the most downstream position in the wing portion 70H (the origin of the trailing edge portion 74 in the wing portion 70H), and the leading edge portion It is the dimension between the positions of the base 72H of 72. The height dimension hb is a dimension between the position of the most downstream side in the wing section 70H and the position of the tip end section 71 in the direction parallel to the rotation shaft 80.

As described in the first embodiment described above, in the case where the propeller fan 50H is viewed from the direction orthogonal to the rotational shaft 80 (that is, when the propeller fan 50H is viewed from the side), the former The edge portion 72 is the upstream side of the direction in which the airflow flows from the outer surface 61 of the boss portion 60 toward the outside of the rotational radial direction, starting from the front end portion in the rotational direction of the root portion 73. It is extended toward. In the wing portion 70H, the value of hb / ha is 2.20.

36 is a cross-sectional view showing a state when the propeller fan 50H is rotating. The propeller fan 50H receives rotational power from the drive motor 30, rotates in the direction of the arrow AR1, and generates air flow (see arrow DR1) flowing from the intake port 15 toward the discharge port 16. As indicated by the arrow DR1, air flow from the intake port 15 flows from the upstream side to the downstream side while following the wing surface of the wing portion 70H and the outer surface 61 of the boss portion 60H.

As described in the first embodiment described above, as the blade portion 70H rotates, a blade tip vortex is generated in the vicinity of the blade tip portion 71 of the blade portion 70H (see arrow DR3). This blade tip vortex is generated so that the vicinity of the blade tip portion 71 is the tip, and extends toward the rear side in the rotational direction (arrow AR1 direction).

Compared to the case of Comparative Example 2 described above, the position of the wing tip portion 71 of the wing portion 70H is far from the position of the downstream end of the wing portion 70H. Therefore, in the propeller fan 50H, between the position where the blade tip vortex is indicated by arrow DR3 and the position where the vortex occurs near the downstream end (rear edge 74) of the wing portion 70H indicated by arrow DR6. The distance is long.

In the propeller fan 50H, the width W11 of the air passage through which the air from the intake port 15 can flow smoothly toward the discharge port 16 is wider than the above width W10 (see FIG. 34), and the inner case 12 It is smaller than the incidence angle θ11 of air to the inner wall surface of or the incident angle θ10 (see FIG. 34). The incidence angle θ11 described herein means an angle formed between the direction in which the air flows and the inner wall surface of the inner case 12 when the air from the inlet 15 contacts the inner wall surface of the inner case 12 do.

When the air from the inlet 15 contacts the inner wall surface of the inner case 12, the flow toward the outer side in the radial direction of rotation is hardly reflected even if it touches the inner wall surface of the inner case 12. The air flowing along the outer surface 61 does not enter the inside, and the air contacting the inner wall surface of the inner case 12 flows toward the downstream side as it is. Therefore, when the propeller fan 50H provided with the wing portion 70H is used, it is possible to effectively suppress foreign substances such as hair from being entangled in the output shaft 31 of the drive motor 30.

[Experimental Example 3]

Referring to Fig. 37, Experimental Example 3 and its results according to Embodiment 2 (Figs. 35 and 36) described above will be described. In this example of experiment, the value of the height dimension ha was set to 15 mm, and the value of the height dimension hb was changed from 15 mm to 35 mm. A propeller fan having a plurality of types of boss portions 60H (see FIG. 35) having different hb / ha values was prepared, and the propeller fan was placed in a cylindrical case together with a drive motor. While rotating the propeller fan, 1000 hairs were flowed from the upstream side to the downstream side. For each propeller fan, the operation of shedding 1000 hairs was repeated 5 times, and the average value of the number of hairs rolled into the output shaft of the drive motor was calculated.

Line L10 in FIG. 37 shows the relationship between the value of hb / ha and the number of hairs rolled into the output shaft of the drive motor. The horizontal axis in Fig. 37 represents the value of hb / ha of the boss portion 60H. The vertical axis in Fig. 37 shows the average number of hairs rolled into the output shaft of the drive motor. This average value is an average value when the operation of shedding 1000 hairs is repeated 5 times.

As indicated by the line L10, it can be seen that as the value of hb / ha is increased from 1.0, the curling of the hair is rapidly decreased. It can be seen that when the value of hb / ha is 1.5 or more, curling of the hair hardly occurs. Therefore, it can be seen that the value of hb / ha of the boss portion 60H may be 1.5 or more.

[Experimental Example 4]

38 and 39, Experimental Example 4 and its results according to Embodiment 2 (FIGS. 35 and 36) described above will be described. In this example, in the direction parallel to the rotation axis 80, the value of the minimum clearance CL (narrowest clearance) formed between the wing portion 70H and the rectifying blade 40 is 0.5 mm to 9.5 mm. Changed to

A plurality of propeller fans having different minimum clearance CL values were prepared, and the propeller fans were placed in a cylindrical case together with a drive motor. While rotating the propeller fan, 1000 hairs were flowed from the upstream side to the downstream side. For each propeller fan, the operation of shedding 1000 hairs was repeated 5 times, and the average value of the number of hairs rolled into the output shaft of the drive motor was calculated. On the other hand, while rotating the propeller fan, the air volume was measured on the downstream side of the cylindrical case.

Line L20 in FIG. 39 shows the relationship between the value of the minimum clearance CL and the number of hairs rolled into the output shaft of the drive motor. Line L21 in FIG. 39 shows the relationship between the value of the minimum clearance CL and the air volume measured on the downstream side of the cylindrical case. Referring to the lines L20 and L21, it can be seen that when the value of the minimum clearance CL is greater than about 3 mm, the air volume at the same rotational speed decreases and the number of hair curling increases. It can be seen that when the value of the minimum clearance CL is 3 mm or less (for example, 2.27 mm), the air volume at the same rotational speed is not lowered, so that it is possible to further suppress the number of hair curling.

[Comparative Example 3]

(Propeller fan (50Z2))

40 is a plan view showing a propeller fan 50Z2 of Comparative Example 3 according to Embodiment 2 (see FIG. 35) described above. The propeller fan 50Z2 includes a boss portion 60Z2 and a wing portion 70Z2. The propeller fan 50Z2 has substantially the same shape as the propeller fan 50Z (see FIG. 4) in Comparative Example 1 described above.

As described in Comparative Example 1 described above, the wing front end 71 and the wing rear end 75 of this comparative example are located on the same circle C10. The outer periphery portion 76 extends in an arc shape along the rotational direction of the wing portion 70Z2 (the circumferential direction around the rotation axis 80). When the propeller fan 50Z2 is viewed in a direction parallel to the rotational axis 80 (that is, when the propeller fan 50Z2 is viewed in a plane), the rotational axis 80 (upstream end 62) and wing tip ( The dimension between 71 and the dimension between the rotating shaft 80 (upstream end 62) and the blade rear end 75 is the same value.

In the state where the propeller fan 50Z2 is stopped, the wing tip portion 71 of the wing portion 70Z2 is located above the circle C10. On the other hand, in the state where the propeller fan 50Z2 is rotating, a large moment (inertia force) acts on the wing surface of the wing tip portion 71 side of the wing portion 70Z2. The wing surface of the wing front end portion 71 side of the wing portion 70Z2 is elastically deformed so as to extend toward the outside in the radial direction of rotation. When the propeller fan 50Z2 is made of a resin molded article, the amount of elastic deformation is further increased. In order to avoid the wing tip 71 from interfering with the inner wall of the inner case 12, it is necessary to increase the inner diameter of the inner case 12.

(First modification)

41 is a plan view showing a propeller fan 50J in the first modification to Embodiment 2 (see FIG. 35) described above. The propeller fan 50J includes a boss portion 60J and a wing portion 70J. As described above, the value of hb / ha of the boss portion 60H (see FIG. 35) may be 1.5 or more. According to the above structure, curling of the hair hardly occurs. On the other hand, when the value of hb / ha is increased, the amount of elastic deformation of the wing surface of the wing portion also increases when the propeller fan is rotating.

As shown in Fig. 41, the outer periphery 76 of the propeller fan 50J in this modification extends toward the inside from the outside in the radial direction of rotation as it faces the blade tip 71. Have In the case where the propeller fan 50J is viewed in a direction parallel to the rotational axis 80 (that is, when the propeller fan 50J is viewed in a plane), the rotational axis 80 (upstream end 62) and the wing tip ( The dimension R1 between 71 is smaller than the dimension R2 between the rotating shaft 80 (upstream end 62) and the blade rear end 75.

Referring to Fig. 42, in the state where the propeller fan 50J is stopped, the wing tip portion 71 of the wing portion 70J is not located above the circle C10, but is located inside the rotational radius direction than the circle C10 ( See the dashed-dotted line in Figure 42). On the other hand, in the state where the propeller fan 50J is rotating, a large moment (inertia force) acts on the wing surface of the wing tip portion 71 side of the wing portion 70J. The wing surface of the wing end portion 70J side of the wing end portion 71 is elastically deformed so as to extend toward the outside in the radial direction of rotation (see arrow DR10). When the propeller fan 50J is made of a resin molded article, the amount of elastic deformation is further increased.

In the propeller fan 50J of this modification, the blade tip portion 71 is located in advance in the radial direction of rotation. Even if the wing surface on the wing tip portion 71 side of the wing portion 70J is elastically deformed so as to extend outward in the radial direction of rotation, interference with the inner wall of the inner case 12 is suppressed. When the propeller fan 50J is rotating at a predetermined number of revolutions, the wing of the propeller fan 50J is rotated so that the portion near the wing tip portion 71 of the outer periphery portion 76 rotates substantially along the circumferential direction (circle C10). The portion 70J may be designed in advance. According to this configuration, high blowing efficiency can be obtained within a range where the wing portion 70J does not interfere with the inner wall of the inner case 12.

(Second modification)

43 is a cross-sectional view partially showing a blowing device according to a second modification to Embodiment 2 (see FIGS. 35 and 36) described above. The air blower of this modified example is provided with the inner case 12A (air path forming member). The inner case 12A has an inner wall portion 12A1 and a concave portion 12W formed to be concave in the inner wall portion 12A1 toward the outside in the radial direction of rotation of the propeller fan 50J. The concave portion 12W has an annular shape, and the air passage in the inner case 12A is wide in the concave portion 12W and narrow in the inner wall portion 12A1.

In the direction parallel to the rotation axis 80, the most downstream portion 12W1 of the concave portion 12W is the downstream portion 67 in the most downstream portion (boss portion 60J) of the boss portion 60J. It is located on the upstream side. In Fig. 43, for convenience, the position of the downstream portion 67 of the boss portion 60J in a direction parallel to the rotation shaft 80 is indicated by the line LL1.

On the other hand, the extension line LL2 is obtained by virtually extending the tangent formed in the portion near the wing tip portion 71 of the wing surface of the wing portion 70J toward the outside in the radial direction of rotation. In the inner case 12A of this modification, in the direction parallel to the rotation shaft 80, the most downstream portion 12W1 of the recess 12W is on the downstream side (the discharge port 16 side) than the extension line LL2. Located. Further, in the direction parallel to the rotation shaft 80, the most upstream portion 12W2 of the concave portion 12W is located on the upstream side (intake port 15 side) than the extension line LL2.

As the wing portion 70J rotates, a wing tip vortex is generated in the vicinity of the wing tip portion 71 of the wing portion 70J (see arrow DR3). This blade tip vortex is generated so that the vicinity of the blade tip portion 71 is the tip, and extends toward the rear side in the rotational direction (arrow AR1 direction). By providing a portion (a concave portion 12W) in which the air passage is widened in the vicinity of the blade tip portion 71 in the inner case 12, the blade tip vortex enters the concave portion 12W by the action of centrifugal force, and the inner case It occurs in the part near the recessed part 12W compared with the case where the recessed part 12W is not provided in (12).

Also in the air blower of this modification, between the position where the blade tip vortex is indicated by arrow DR3 and the position where the vortex is generated near the downstream end (rear edge 74) of the wing portion 70J indicated by arrow DR6. The distance is longer than in the case of Comparative Example 2 (see FIG. 34) described above. The width of the air passage through which the air from the intake port 15 can flow smoothly toward the discharge port 16 is wider than the width W10 (see FIG. 34) of Comparative Example 2, and the air relative to the inner wall surface of the inner case 12A. The angle of incidence is smaller than the angle of incidence θ10 of Comparative Example 2 (see FIG. 34).

When the air from the intake port 15 contacts the inner wall surface of the inner case 12A, the flow toward the outer side in the radial direction of rotation is hardly reflected even if it touches the inner wall surface of the inner case 12A. The air flowing along the outer surface 61 does not enter the inside, and the air contacting the inner wall surface of the inner case 12A flows toward the downstream side as it is. Therefore, even in the blower of the present modification, it is possible to effectively suppress foreign matters such as hair from being entangled with the output shaft 31 of the drive motor 30.

In the inner case 12A of this modification, the most downstream portion 12W1 of the concave portion 12W is upstream of the most downstream portion (the downstream portion 67 in the boss portion 60J) of the boss portion 60J. Located on the side, the most downstream portion 12W1 of the concave portion 12W is located on the downstream side (the discharge port 16 side) than the extension line LL2, and the most upstream portion 12W2 of the concave portion 12W is It is located on the upstream side (intake port 15 side) of the extension line LL2. It is not limited to this structure, and the inner case 12A of this modification may be configured as follows.

That is, in the direction parallel to the rotation axis 80, the most downstream portion 12W1 of the concave portion 12W is the most downstream portion of the boss portion 60J (the downstream portion 67 in the boss portion 60J) ), And the most downstream portion 12W1 of the concave portion 12W is lower than the blade tip portion 71 of the wing portion 70J of the propeller fan 50J (the discharge outlet 16 side) In addition, the most upstream side portion 12W2 of the concave portion 12W is located upstream (the suction port 15 side) than the wing tip portion 71 of the wing portion 70J of the propeller fan 50J. In this way, the inner case 12A of the present modification may be configured.

Even with the inner case 12A having such a configuration, the flow toward the outside in the radial direction of rotation when the air from the inlet 15 contacts the inner wall surface of the inner case 12A, the inner wall surface of the inner case 12A Even if it comes into contact with, it is hardly reflected. The air flowing along the outer surface 61 does not enter the inside, and the air contacting the inner wall surface of the inner case 12A flows toward the downstream side as it is. As a result, it becomes possible to effectively suppress foreign matters such as hair from being entangled with the output shaft 31 of the drive motor 30.

(Third variant)

44 is a cross-sectional view partially showing a blowing device in a third modification to Embodiment 2 (see FIGS. 35 and 36) described above. The air blower of this modified example is provided with the inner case 12B (air path forming member). The inner case 12B has a first inner wall portion 12B1 and a second inner wall portion 12B2. The second inner wall portion 12B2 is located downstream (the discharge port 16 side) than the first inner wall portion 12B1, and has a narrower air passage area than the first inner wall portion 12B1. A step is formed between the first inner wall portion 12B1 and the second inner wall portion 12B2, and the air passage in the inner case 12B is wide in the first inner wall portion 12B1, and the second inner wall portion 12B2 It is narrowed in.

In the direction parallel to the rotation shaft 80, the most upstream portion 12BB of the second inner wall portion 12B2 is the most downstream portion of the boss portion 60J (the downstream portion 67 in the boss portion 60J) )). In Fig. 44, for convenience, the position of the downstream portion 67 of the boss portion 60J in the direction parallel to the rotation shaft 80 is indicated by the line LL1.

On the other hand, the extension line LL2 is obtained by virtually extending the tangent formed in the portion near the wing tip portion 71 of the wing surface of the wing portion 70J toward the outside in the radial direction of rotation. In the inner case 12B of this modified example, in the direction parallel to the rotation shaft 80, the most upstream portion 12BB of the second inner wall portion 12B2 is downstream from the extension line LL2 (the discharge port 16 side) ).

As the wing portion 70J rotates, a wing tip vortex is generated in the vicinity of the wing tip portion 71 of the wing portion 70J (see arrow DR3). This blade tip vortex is generated so that the vicinity of the blade tip portion 71 is the tip, and extends toward the rear side in the rotational direction (arrow AR1 direction). By providing a portion (a step between the first inner wall portion 12B1 and the second inner wall portion 12B2) in the vicinity of the wing tip portion 71 in the inner case 12, the wing tip vortex is centrifugal By action, it enters into the step between the first inner wall portion 12B1 and the second inner wall portion 12B2, and occurs in a portion near the first inner wall portion 12B1 as compared to the case where no step is installed in the inner case 12 do.

Also in the air blower of this modification, between the position where the blade tip vortex is indicated by arrow DR3 and the position where the vortex occurs near the downstream end (rear edge 74) of the wing portion 70J indicated by arrow DR6. The distance is longer than in the case of Comparative Example 2 (see FIG. 34) described above. The width of the air passage through which the air from the intake port 15 can flow smoothly toward the discharge port 16 is wider than the width W10 (see FIG. 34) of Comparative Example 2, and the air relative to the inner wall surface of the inner case 12B The angle of incidence is smaller than the angle of incidence θ10 of Comparative Example 2 (see FIG. 34).

When the air from the intake port 15 contacts the inner wall surface of the inner case 12B, the flow toward the outside in the radial direction of rotation is hardly reflected even if it touches the inner wall surface of the inner case 12B. The air flowing along the outer surface 61 does not enter the inside, and the air contacting the inner wall surface of the inner case 12B flows toward the downstream side as it is. Therefore, even in the blower of the present modification, it is possible to effectively suppress foreign matters such as hair from being entangled with the output shaft 31 of the drive motor 30.

In the inner case 12B of this modification, the most upstream part 12BB of the second inner wall part 12B2 is the downstream part 67 in the most downstream part (boss part 60J) of the boss part 60J. It is located on the upstream side, and further, the most upstream portion 12BB of the second inner wall portion 12B2 is located on the downstream side (the discharge port 16 side) than the extension line LL2. This configuration is not limited, and the inner case 12B of the present modification may be configured as follows.

That is, in the direction parallel to the rotation axis 80, the most upstream portion 12BB of the second inner wall portion 12B2 is in the most downstream portion (boss portion 60J) of the boss portion 60J. Located on the upstream side of the downstream portion 67, and the most upstream portion 12BB of the second inner wall portion 12B2 is on the downstream side of the wing tip portion 71 of the wing portion 70J of the propeller fan 50J ( The inner case 12B of this modified example may be configured so as to be located at the discharge port 16 side).

Even with the inner case 12B having such a configuration, when the air from the inlet 15 contacts the inner wall surface of the inner case 12B, the flow toward the outside in the radial direction of rotation is the inner wall surface of the inner case 12B. Even if it comes into contact with, it is hardly reflected. The air flowing along the outer surface 61 does not enter the inside, and the air contacting the inner wall surface of the inner case 12B flows toward the downstream side as it is. As a result, it becomes possible to effectively suppress foreign matters such as hair from being entangled with the output shaft 31 of the drive motor 30.

[Embodiment 3]

45 is a plan view showing a propeller fan 50K and a rectifying blade 40K in this embodiment. In FIG. 45, the state when the bearing part 69 of the propeller fan 50K is attached to the output shaft 31 of the drive motor 30 (not shown) is shown. 46 is a plan view showing a state when the propeller fan 50K is attached to the drive motor 30 (not shown). Fig. 47 is a plan view showing an enlarged area surrounded by the XK 'line in Fig. 46.

(Propeller fan (50K))

45 to 47, the propeller fan 50K includes a boss portion 60K and a wing portion 70K, and the propeller fan 50 in the first embodiment described above (see FIG. 12). It has almost the same shape. The propeller fan 50K is attached to the output shaft 31 of the drive motor as indicated by the arrow DR50 in FIG. 45.

45 and 47, when the propeller fan 50K is viewed in a direction parallel to the rotation axis 80 (not shown) (that is, when the propeller fan 50K is viewed in a plane), the reference line LA and a virtual straight line LB (third virtual straight line) are formed. The reference line LA is connected to the innermost portion 79 of the trailing edge portion 74 of the wing portion 70K and the rotating shaft 80 (upstream end portion 62) in the radial direction of rotation of the propeller fan 50K. It is a virtually obtained straight line.

The virtual straight line LB is in the radial direction of rotation of the propeller fan 50K, in the innermost portion 79 of the trailing edge portion 74 of the wing portion 70K, and in the radial direction of rotation of the propeller fan 50K It is a straight line obtained virtually by connecting the outermost portion (wing rear end portion 75) of the trailing edge portion 74 of the portion 70K. An angle θA is formed between the reference line LA and the virtual straight line LB.

(Rectified wing (40K))

As shown in FIG. 45, in the blower of this embodiment, five commutation blades 40K are used. The plate-shaped portion 42 of the rectifying blade 40K extends radially from the outer surface of the motor support portion 44 toward the outside. The five plate-shaped portions 42 are arranged at intervals in the circumferential direction so as not to lower the flow rate of the air flow flowing from the suction port toward the discharge port. The plate-shaped portion 42 has an upstream edge portion 43 on the upstream side. The upstream rim portion 43 of this embodiment has a planar shape and extends along a direction perpendicular to the rotation axis 80 (not shown) of the propeller fan 50K.

45 and 47, when the rectifying blade 40K is viewed from a direction parallel to the rotation axis 80 (not shown) (that is, when the rectifying blade 40K is viewed in a plane), the reference line LC and virtual straight LD (fourth virtual straight) are formed. The reference line LC is connected to the innermost portion 47 of the upstream rim portion 43 of the rectifying blade 40K and the rotating shaft 80 (output shaft 31) in the radial direction of rotation of the propeller fan 50K. It is a virtually obtained straight line.

The virtual straight LD is in the radial direction of rotation of the propeller fan 50K, in the innermost portion 47 of the upstream rim portion 43 of the rectifying blade 40K, and in the radial direction of rotation of the propeller fan 50K, It is a straight line obtained virtually by connecting the outermost portion 48 of the upstream rim portion 43 of the rectifying blade 40K. An angle θB is formed between the reference line LC and the virtual straight line LD.

Referring to Fig. 47, in the blower of the present embodiment, the value of the angle θA is 43 °, and the value of the angle θB is -13 °. When the imaginary straight lines LB and LD are extended toward the front side in the rotational direction than the reference lines LA and LC, the angles θA and θB become positive values. When the imaginary straight lines LB and LD are extended toward the rear side in the rotational direction than the reference lines LA and LC, the angles θA and θB become negative values. In the blower of the present embodiment, when the difference between the angles θA and θB is θC, the angle difference θC = 43-(-13) = 56 °.

For example, suppose the angle difference θC = 0 °. In this case, the virtual straight line LB formed along the trailing edge portion 74 of the wing portion 70K and the virtual straight line LD formed along the upstream edge portion 43 of the rectifying blade 40K extend toward each other in the same direction. It has a shape. When the rear edge portion 74 of the wing portion 70K and the upstream edge portion 43 of the rectifying blade 40K are opposed to each other, and they are viewed in a direction parallel to the rotating shaft 80 (in other words, a propeller fan ( 50K), the rear edge portion 74 of the wing portion 70K and the upstream edge portion 43 of the rectifying blade 40K overlap most or completely.

When the rear edge portion 74 of the wing portion 70K and the upstream edge portion 43 of the rectifying blade 40K are faced with each other, and they are viewed in a plane, when they are completely overlapped with each other, rotation of the propeller fan 50K The noise generated at the time increases. In the blower of the present embodiment, since the angle difference θC = 56 °, noise generation from the propeller fan 50K is effectively suppressed.

[Experimental Example 5]

Referring to Fig. 48, Experimental Example 5 and its results according to Embodiment 3 (Figs. 45 to 47) described above will be described. In this experimental example, the angle formed in the upstream rim portion 43 of the rectifying blade 40K while the value of the angle θA (see FIG. 47) formed on the trailing edge portion 74 of the wing portion 70K is fixed. The value of θB (see FIG. 47) was changed. 48 is a diagram showing the relationship between the angle difference θC obtained at that time and noise. As described above, the angle difference θC means a difference between the angles θA and θB. In this example, the value of the angle difference θC was changed from 0 ° to 120 ° by changing the value of the angle θB (see FIG. 47).

In the line L30 in FIG. 48, the imaginary straight line LD formed on the upstream edge portion 43 of the rectifying blade 40K has a rear side in the rotational direction than the virtual straight line LB formed on the trailing edge portion 74 of the wing portion 70K. The relationship between the angle difference θC and noise in the case of facing (the case as shown in Fig. 47) is shown. In the line L31 in FIG. 48, the imaginary straight line LD formed on the upstream rim portion 43 of the rectifying blade 40K has a front side in the rotational direction than the virtual straight line LB formed on the trailing edge portion 74 of the wing portion 70K. The relationship between the angle difference θC and noise in the case of facing is shown.

With reference to the lines L30 and L31, it can be seen that as the value of the angle difference θC is increased from 0 °, the noise rapidly decreases. When the value of the angle difference θC is 10 ° or more and 90 ° or less, it can be seen that the generation of noise is greatly suppressed. Therefore, the value of the angle difference θC, that is, the angle formed by the virtual straight line LD formed on the upstream edge portion 43 of the rectifying blade 40K and the virtual straight line LB formed on the trailing edge portion 74 of the wing portion 70K. It can be seen that 10 ° or more and 90 ° or less.

The reason is that when airflow flows between the trailing edge portion 74 of the wing portion 70K and the upstream edge portion 43 of the rectifying blade 40K, it is difficult for the airflow to be disturbed, and the rectifying blade 40K By following, the airflow can flow smoothly toward the downstream side, so that the trailing edge portion 74 of the wing portion 70K passes through a portion facing the upstream edge portion 43 of the rectifying blade 40K, so-called peak sound. It is considered that this is difficult to occur. In addition, when the value of the angle difference θC is 130 ° or more, the length of the rectifying blade 40K becomes longer, so that the overlapping time between the wing portion 70K and the rectifying blade 40K increases, and the effect of reducing noise is The result is slightly less.

(First modification)

49 is a plan view schematically showing a propeller fan 50L1 and a rectifying blade 40L1 in the first modification of the third embodiment. The propeller fan 50L1 has a boss portion 60L1 and a wing portion 70L1. When the propeller fan 50L1 is viewed in a plane, the trailing edge portion 74 of the wing portion 70L1 has a substantially straight shape. A virtual straight line LB is formed on the trailing edge portion 74 of the wing portion 70L1, similarly to the third embodiment described above.

When the rectifying blade 40L1 is viewed in a plane, the upstream edge portion 43 of the rectifying blade 40L1 extends along the rotational radial direction. A virtual straight line LD is formed on the upstream edge portion 43 of the rectifying blade 40L1, as in the third embodiment described above. The upstream edge portion 43 (virtual straight line LD) of the rectifying blade 40L1 extends toward the rear side in the rotational direction than the trailing edge portion 74 (virtual straight line LB) of the wing portion 70L1.

Also in the case of this modification, the value of the angle difference θC, that is, the virtual straight line LD formed on the upstream edge portion 43 of the rectifying blade 40L1 and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70L1 When the angle formed by the LB is 10 ° or more and 90 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing the noise generated from the propeller fan 50L1 It becomes possible.

(Second modification)

50 is a plan view schematically showing a propeller fan 50L2 and a rectifying blade 40L2 in the second modification of the third embodiment. The propeller fan 50L2 has a boss portion 60L2 and a wing portion 70L2. When the propeller fan 50L2 is viewed in a plan view, the trailing edge portion 74 of the wing portion 70L2 has a substantially straight shape, and the front side in the rotational direction toward the outer circumferential side (the inner case 12 side). It is extended toward. A virtual straight line LB is formed on the trailing edge portion 74 of the wing portion 70L2, similarly to the third embodiment described above.

When the rectifying blade 40L2 is viewed in a plane, the upstream rim portion 43 of the rectifying blade 40L2 has a substantially straight shape, and the rear side in the rotational direction toward the outer circumferential side (inner case 12 side). It is extended toward. A virtual straight line LD is formed in the upstream edge portion 43 of the rectifying blade 40L2, as in the third embodiment described above. The upstream edge portion 43 (virtual straight line LD) of the rectifying blade 40L2 extends toward the rear side in the rotational direction than the trailing edge portion 74 (virtual straight line LB) of the wing portion 70L2.

Also in the case of this modification, the value of the angle difference θC, that is, the virtual straight line LD formed on the upstream edge portion 43 of the rectifying blade 40L2 and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70L2 When the angle formed by the LB is 10 ° or more and 90 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing noise generated from the propeller fan 50L2 It becomes possible.

(Third variant)

51 is a plan view schematically showing the propeller fan 50L3 and the rectifying blade 40L3 in the third modification of the third embodiment. The propeller fan 50L3 has a boss portion 60L3 and a wing portion 70L3. When the propeller fan 50L3 is viewed in a plane, the trailing edge portion 74 of the wing portion 70L3 has a substantially straight shape and extends along the radial direction of rotation. A virtual straight line LB is formed on the trailing edge portion 74 of the wing portion 70L3, similarly to the third embodiment described above.

When the rectifying blade 40L3 is viewed in a plane, the upstream rim portion 43 of the rectifying blade 40L3 has an arcuate shape, and the rear side in the rotational direction toward the outer circumferential side (inner case 12 side). It is extended toward. In the upstream edge portion 43 of the rectifying blade 40L3, a virtual straight line LD is formed as in the third embodiment described above. The upstream edge portion 43 (virtual straight line LD) of the rectifying blade 40L3 extends toward the rear side in the rotational direction than the trailing edge portion 74 (virtual straight line LB) of the wing portion 70L3.

Also in the case of this modification, the value of the angle difference θC, that is, the virtual straight line LD formed on the upstream edge portion 43 of the rectifying blade 40L3 and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70L3 When the angle formed by the LB is 10 ° or more and 90 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing noise generated from the propeller fan 50L3 It becomes possible.

(Fourth modification)

52 is a plan view schematically showing a propeller fan 50L4 and a rectifying blade 40L4 in a fourth modification of the third embodiment. The propeller fan 50L4 has a boss portion 60L4 and a wing portion 70L4. When the propeller fan 50L4 is viewed in a plane, the trailing edge portion 74 of the wing portion 70L4 has a curved shape, and a part of the radial direction of rotation is concave toward the front side of the rotational direction. A virtual straight line LB is formed on the trailing edge portion 74 of the wing portion 70L4, similarly to the third embodiment described above.

When the rectifying blade 40L4 is viewed in a plane, the upstream rim portion 43 of the rectifying blade 40L4 has a straight shape, and the rear side in the rotation direction is directed toward the outer circumferential side (inner case 12 side). It is extended toward. In the upstream edge portion 43 of the rectifying blade 40L4, a virtual straight line LD is formed as in the third embodiment described above. The upstream edge portion 43 (virtual straight line LD) of the rectifying blade 40L4 extends toward the rear side in the rotational direction than the trailing edge portion 74 (virtual straight line LB) of the wing portion 70L4.

Also in the case of this modification, the value of the angle difference θC, that is, the virtual straight line LD formed on the upstream edge portion 43 of the rectifying blade 40L4 and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70L4 When the angle formed by the LB is 10 ° or more and 90 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing noise generated from the propeller fan 50L4 It becomes possible.

(Fifth modification)

53 is a plan view schematically showing the propeller fan 50L5 and the rectifying blade 40L5 in the fifth modification of the third embodiment. The propeller fan 50L5 has a boss portion 60L5 and a wing portion 70L5. When the propeller fan 50L5 is viewed in a plane, the trailing edge portion 74 of the wing portion 70L5 has a linear shape and extends along the radial direction of rotation. A virtual straight line LB is formed on the trailing edge portion 74 of the wing portion 70L5, similarly to the third embodiment described above.

When the rectifying blade 40L5 is viewed in a plane, the upstream rim portion 43 of the rectifying blade 40L5 has a curved shape, and the front side in the rotational direction toward the outer circumferential side (inner case 12 side). It is extended toward. In the upstream edge portion 43 of the rectifying blade 40L5, a virtual straight line LD is formed as in the third embodiment described above. The upstream edge portion 43 (virtual straight line LD) of the rectifying blade 40L5 extends toward the front side in the rotational direction than the trailing edge portion 74 (virtual straight line LB) of the wing portion 70L5.

Also in the case of this modification, the value of the angle difference θC, that is, the virtual straight line LD formed on the upstream edge portion 43 of the rectifying blade 40L5 and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70L5 When the angle formed by the LB is 10 ° or more and 90 ° or less, it becomes possible to effectively suppress noise generated from the propeller fan 50L5.

(Sixth modification)

54 is a plan view schematically showing a propeller fan 50L6 and a rectifying blade 40L6 in a sixth modification of the third embodiment. The propeller fan 50L6 has a boss portion 60L6 and a wing portion 70L6. When the propeller fan 50L6 is viewed in a plane, the trailing edge portion 74 of the wing portion 70L6 has a straight shape and extends along the radial direction of rotation. A virtual straight line LB is formed on the trailing edge portion 74 of the wing portion 70L6, similarly to the third embodiment described above.

When the rectifying blade 40L6 is viewed in a plane, the upstream rim portion 43 of the rectifying blade 40L6 has a straight shape, and the front side in the rotational direction is directed toward the outer circumferential side (inner case 12 side). It is extended toward. A virtual straight line LD is formed on the upstream edge portion 43 of the rectifying blade 40L6, as in the third embodiment described above. The upstream edge portion 43 (virtual straight line LD) of the rectifying blade 40L6 extends toward the front side in the rotational direction than the trailing edge portion 74 (virtual straight line LB) of the wing portion 70L6.

Also in the case of this modification, the value of the angle difference θC, that is, the virtual straight line LD formed on the upstream edge portion 43 of the rectifying blade 40L6 and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70L6 When the angle formed by the LB is 10 ° or more and 90 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing noise generated from the propeller fan 50L6 It becomes possible.

(Seventh modification)

55 is a plan view schematically showing a propeller fan 50L7 and a rectifying blade 40L7 in a seventh modification of the third embodiment. The propeller fan 50L7 has a boss portion 60L7 and a wing portion 70L7. When the propeller fan 50L7 is viewed in a plane, the trailing edge portion 74 of the wing portion 70L7 has a linear shape and extends along the radial direction of rotation. A virtual straight line LB is formed on the trailing edge portion 74 of the wing portion 70L7 as in the third embodiment described above.

When the rectifying blade 40L7 is viewed in a plane, the upstream rim portion 43 of the rectifying blade 40L7 has a straight shape, and the rear side in the rotational direction is directed toward the outer circumferential side (the inner case 12 side). It is extended toward. A virtual straight line LD is formed in the upstream edge portion 43 of the rectifying blade 40L7, as in the third embodiment described above. The upstream edge portion 43 (virtual straight line LD) of the rectifying blade 40L7 extends toward the rear side in the rotational direction than the trailing edge portion 74 (virtual straight line LB) of the wing portion 70L7.

Also in the case of this modification, the value of the angle difference θC, that is, the virtual straight line LD formed on the upstream edge portion 43 of the rectifying blade 40L7 and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70L7 Since the angle formed by the LB is 10 ° or more and 90 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing noise generated from the propeller fan 50L7 It becomes possible.

(Example 8)

56 is a plan view schematically showing the wing portion 70M1 of the propeller fan and the upstream edge portion 43 of the rectifying blade in the eighth modification of the third embodiment. When the wing portion 70M1 is viewed in a plane, the trailing edge portion 74 of the wing portion 70M1 has an arc shape and is curved in a convex shape toward the rear side in the rotational direction. When the upstream edge portion 43 of the rectifying blade is viewed in a plane, the upstream edge portion 43 has a straight shape.

Each of the trailing edge portion 74 of the wing portion 70M1 and the upstream edge portion 43 of the rectifying blade, when viewed in a direction parallel to the rotating shaft 80 (not shown) in a state where they are opposed to each other, Only some of them have a cross shape. Also in the case of this modification, since the airflow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(9th modification)

57 is a plan view schematically showing the wing portion 70M2 of the propeller fan and the upstream edge portion 43 of the rectifying blade in the ninth modification of the third embodiment. When the wing portion 70M2 is viewed in a plane, the trailing edge portion 74 of the wing portion 70M2 has an arcuate shape and is curved in a concave shape toward the front side in the rotational direction. When the upstream edge portion 43 of the rectifying blade is viewed in a plane, the upstream edge portion 43 has a straight shape.

Each of the trailing edge portion 74 of the wing portion 70M2 and the upstream edge portion 43 of the rectifying blade, when viewed in a direction parallel to the rotating shaft 80 (not shown) in a state where they are opposed to each other, Only some of them have a cross shape. Also in the case of this modification, since the airflow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(Third modification)

58 is a plan view schematically showing the wing portion 70M3 of the propeller fan and the upstream edge portion 43 of the rectifying blade in the tenth modification of the third embodiment. When the wing portion 70M3 is viewed in a plane, the trailing edge portion 74 of the wing portion 70M3 has a curved shape, and a part of the radial direction of rotation is formed to be concave toward the front side in the rotational direction. When the upstream edge portion 43 of the rectifying blade is viewed in a plane, the upstream edge portion 43 has a straight shape.

Each of the trailing edge portion 74 of the wing portion 70M3 and the upstream edge portion 43 of the rectifying blade, when they are viewed in a direction parallel to the rotating shaft 80 (not shown) while facing each other, Only some of them have a cross shape. Also in the case of this modification, since the airflow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(11th modified example)

59 is a plan view schematically showing the wing portion 70M4 of the propeller fan and the upstream edge portion 43 of the rectifying blade in the eleventh modification of the third embodiment. When the wing portion 70M4 is viewed in a plane, the trailing edge portion 74 of the wing portion 70M4 has a curved shape, and a part of the radial direction of rotation is formed to protrude toward the rear side of the radial direction of rotation. When the upstream edge portion 43 of the rectifying blade is viewed in a plane, the upstream edge portion 43 has a curved shape and is curved in a convex shape toward the front side in the rotational direction.

Each of the trailing edge portion 74 of the wing portion 70M4 and the upstream edge portion 43 of the rectifying blade, when viewed in a direction parallel to the rotating shaft 80 (not shown) in a state where they are opposed to each other, Only some of them have a cross shape. Also in the case of this modification, since the airflow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(12th modified example)

60 is a plan view schematically showing the wing portion 70M5 of the propeller fan and the upstream edge portion 43 of the rectifying blade in the twelfth modification of the third embodiment. When the wing portion 70M5 is viewed in a plane, the trailing edge portion 74 of the wing portion 70M5 has an arc shape and is curved in a convex shape toward the rear side in the rotational direction. When the upstream edge portion 43 of the rectifying blade is viewed in a plane, the upstream edge portion 43 has a curved shape and is curved in a convex shape toward the front side in the rotational direction.

Each of the trailing edge portion 74 of the wing portion 70M5 and the upstream edge portion 43 of the rectifying blade, when they are viewed in a direction parallel to the rotating shaft 80 (not shown) in a state where they are opposed to each other, Only some of them have a cross shape. Also in the case of this modification, since the airflow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(13th modification)

Fig. 61 is a plan view schematically showing the wing portion 70M6 of the propeller fan and the upstream edge portion 43 of the rectifying blade in the thirteenth modification of the third embodiment. When the wing portion 70M6 is viewed in a plane, the trailing edge portion 74 of the wing portion 70M6 has a linear shape and extends along the rotational radial direction. When the upstream edge portion 43 of the rectifying blade is viewed in a plane, the upstream edge portion 43 has a curved shape and is curved in a convex shape toward the front side in the rotational direction.

Each of the trailing edge portion 74 of the wing portion 70M6 and the upstream edge portion 43 of the rectifying blade, when viewed in a direction parallel to the rotating shaft 80 (not shown) in a state where they are opposed to each other, Only some of them have a cross shape. In the case of this modification, since the airflow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(Variation 14)

Fig. 62 is a plan view schematically showing the wing portion 70M7 of the propeller fan and the upstream edge portion 43 of the rectifying blade in the fourteenth modification of the third embodiment. When the wing portion 70M7 is viewed in a plane, the trailing edge portion 74 of the wing portion 70M7 has a straight shape and extends along the rotational radial direction. When the upstream edge portion 43 of the rectifying blade is viewed in a plane, the upstream edge portion 43 has a curved shape and is curved in a concave shape toward the rear side in the rotation direction.

Each of the trailing edge portion 74 of the wing portion 70M7 and the upstream edge portion 43 of the rectifying blade, when viewed in a direction parallel to the rotating shaft 80 (not shown) in a state where they are opposed to each other, Only some of them have a cross shape. Also in the case of this modification, since the airflow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(15th modification)

63 is a plan view schematically showing the wing portion 70M8 of the propeller fan and the upstream edge portion 43 of the rectifying blade in the fifteenth modification of the third embodiment. When the wing portion 70M8 is viewed in a plane, the trailing edge portion 74 of the wing portion 70M8 has a curved shape, and a part of the radial direction of rotation is formed to be concave toward the front side in the rotational direction. When the upstream edge portion 43 of the rectifying blade is viewed in a plane, the upstream edge portion 43 has a straight shape.

Each of the trailing edge portion 74 of the wing portion 70M8 and the upstream edge portion 43 of the rectifying blade, when viewed in a direction parallel to the rotating shaft 80 (not shown) in a state where they are opposed to each other, Only some of them have a cross shape. Also in the case of this modification, since the airflow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(16th modification)

64 is a plan view schematically showing the wing portion 70M9 of the propeller fan and the upstream edge portion 43 of the rectifying blade in the sixteenth modification of the third embodiment. When the wing portion 70M9 is viewed in a plane, the trailing edge portion 74 of the wing portion 70M9 has an arcuate shape and is curved in a concave shape toward the front side in the rotational direction. When the upstream edge portion 43 of the rectifying blade is viewed in a plane, the upstream edge portion 43 has a circular arc shape and is curved in a concave shape toward the rear side in the rotational direction.

Each of the trailing edge portion 74 of the wing portion 70M9 and the upstream edge portion 43 of the rectifying blade, when they are viewed in a direction parallel to the rotating shaft 80 (not shown) while facing each other, Only some of them have a cross shape. Also in the case of this modification, since the airflow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

[Embodiment 4]

65 is a cross-sectional view showing a propeller fan 50N and a rectifying blade 40N in the present embodiment. 66 is an enlarged cross-sectional view showing the propeller fan 50N and the rectifying blade 40N in this embodiment.

(Propeller fan (50N))

65 and 66, the propeller fan 50N includes a boss portion 60N and a wing portion 70N, and the propeller fan 50 in the first embodiment described above (see FIG. 10). It has almost the same shape.

As shown in FIG. 66, when the propeller fan 50N is viewed from the direction perpendicular to the rotation axis 80 (not shown) (that is, when the propeller fan 50N is viewed from the side), the baseline LP and the virtual A straight line LQ (first virtual straight line) is formed. The reference line LP passes through the innermost portion 79 of the trailing edge portion 74 of the wing portion 70N in the radial direction of rotation of the propeller fan 50N, and is further connected to the rotation axis 80 of the propeller fan 50N. It is an imaginary straight line extending in a direction perpendicular to the.

The virtual straight line LQ is in the radial direction of rotation of the propeller fan 50N, in the radial direction of the innermost portion 79 of the trailing edge portion 74 of the wing portion 70N, and in the rotational radius direction of the propeller fan 50N It is a straight line obtained virtually by connecting the outermost portion (wing rear end portion 75) of the trailing edge portion 74 of the portion 70N. An angle θP is formed between the reference line LP and the virtual straight line LQ.

(Rectified wing (40N))

As shown in FIG. 66, when the rectifying blade 40N is viewed from a direction perpendicular to the rotation axis 80 (not shown) (that is, when the rectifying blade 40N is viewed from the side), the reference line LR and virtual A straight line LS (second virtual straight line) is formed. The reference line LR passes through the innermost portion 47 of the upstream rim portion 43 of the rectifying blade 40N in the radial direction of rotation of the propeller fan 50N, and is connected to the rotating shaft 80 of the propeller fan 50N. It is an imaginary straight line extending in a direction perpendicular to the.

The virtual straight line LS is in the radial direction of rotation of the propeller fan 50N, in the innermost portion 47 of the upstream rim portion 43 of the rectifying blade 40N, and in the radial direction of rotation of the propeller fan 50N, It is a straight line obtained virtually by connecting the outermost portion 48 of the upstream rim portion 43 of the rectifying blade 40N. An angle θQ (not shown; angle θQ = 0 ° in the present embodiment) is formed between the reference line LR and the virtual straight line LS.

In the blower of the present embodiment, the value of the angle θP is 23 °, and the value of the angle θQ is 0 °. When the virtual straight lines LQ and LS are extended toward the upstream side (the side of the suction port 15) in the direction in which the air flows, the angles θP and θQ become positive values than the reference lines LP and LR. When the imaginary straight lines LQ and LS are extended toward the downstream side (the side of the discharge port 16) in the direction in which the air flows, the angles θP and θQ become negative values than the reference lines LP and LR. In the blower of the present embodiment, when the difference between the angles θP and θQ is θT, the angle difference θT = 23-0 = 23 °.

Suppose, for example, that the angle difference θT = 0 °. In this case, the virtual straight line LQ formed along the trailing edge portion 74 of the wing portion 70N and the virtual straight line LS formed along the upstream edge portion 43 of the rectifying blade 40N have a parallel relationship, They have a shape extending toward the same direction. Looking at them in a direction perpendicular to the rotating shaft 80 in a state where the rear edge portion 74 of the wing portion 70N and the upstream edge portion 43 of the rectifying blade 40N are opposed to each other (in other words, propeller fan 50N ), When one of them is virtually moved along the direction parallel to the rotational axis 80 toward the other of them to contact each other (see arrow AR2 in FIG. 65), the gap between them Is not formed.

On the other hand, in the blower of the present embodiment, the angle difference θT = 23 °. Looking at them in a direction perpendicular to the rotating shaft 80 in a state where the rear edge portion 74 of the wing portion 70N and the upstream edge portion 43 of the rectifying blade 40N are opposed to each other (in other words, propeller fan 50N ) From the side), when one of these is virtually moved along the direction parallel to the rotational axis 80 toward the other of them to contact each other (see arrow AR2 in Fig. 65), the gap S between them (See FIG. 65). Therefore, in the blower of the present embodiment, noise generation from the propeller fan 50N is effectively suppressed.

[Experimental Example 6]

Referring to FIG. 67, Experimental Example 6 and its results according to Embodiment 4 (FIGS. 65 and 66) described above will be described. In this experimental example, the angle formed in the upstream rim portion 43 of the rectifying blade 40N while the value of the angle θP (see FIG. 66) formed on the trailing edge portion 74 of the wing portion 70N is fixed. The value of θQ (not shown in FIG. 66; see FIGS. 69 to 71) was changed. 67 is a diagram showing the relationship between the angle difference θT obtained at that time and noise. As described above, the angle difference θT means a difference between the angle θP and the angle θQ. The gap between the wing portion 70N and the rectifying blade 40N was set to a fixed value of 2.27 mm in the narrowest portion.

The line L40 in FIG. 67 is a direction in which the virtual straight line LS formed in the upstream edge portion 43 of the rectifying blade 40N flows more than the virtual straight line LQ formed in the trailing edge portion 74 of the wing portion 70N. The relationship between the angle difference θT and noise in the case facing the upstream side (the case as shown in FIGS. 70 and 72) is shown. The line L41 in FIG. 67 is a direction in which the virtual straight line LS formed in the upstream edge portion 43 of the rectifying blade 40N flows more than the virtual straight line LQ formed in the trailing edge portion 74 of the wing portion 70N. The relationship between the angle difference θT and noise in the case of facing the downstream side (a case as shown in FIGS. 66, 68, 69 and 71) is shown.

Referring to the line L40 and the line L41, it can be seen that as the value of the angle difference θT is increased from 0 °, the noise is rapidly reduced. When the value of the angle difference θT is 10 ° or more and 80 ° or less, it can be seen that generation of noise is greatly suppressed. Therefore, the angle difference θT, that is, the angle formed by the virtual straight line LS formed on the upstream edge portion 43 of the rectifying blade 40N and the virtual straight line LQ formed on the trailing edge portion 74 of the wing portion 70N. It can be seen that 10 ° or more and 80 ° or less.

This is because, when airflow flows between the trailing edge portion 74 of the wing portion 70N and the upstream edge portion 43 of the rectifying blade 40N, the airflow is less likely to be disturbed, and the rectifying blade 40N As it follows, the airflow can flow smoothly toward the downstream side, so that the so-called peak sound when the trailing edge portion 74 of the wing portion 70N passes through the portion facing the upstream edge portion 43 of the rectifying blade 40N. It is considered that this is difficult to occur.

In addition, when the upstream edge portion 43 of the rectifying blade 40N is not perpendicular to the rotation axis 80, but is formed so that the trailing edge portion 74 of the wing portion 70N is largely inclined, the value of the angle difference θT Cases of more than 90 ° are also considered. Although it is usually difficult to make such a shape, even if it is made, when the value of the angle difference θT exceeds 80 °, since the distance between the rectifying blade 40N and the wing portion 70N is greatly reduced, a swirl component is generated. It has been obtained that there is a loss due to failure to recover, and the effect of reducing noise is slightly reduced.

(First modification)

68 is a cross-sectional view showing the propeller fan 50P and the rectifying blade 40P in the first modification of the fourth embodiment. The propeller fan 50P has a boss portion 60P and a wing portion 70P. When the propeller fan 50P is viewed from the side, the trailing edge portion 74 of the wing portion 70P has a curved shape and is formed to protrude toward the downstream side in the direction in which the airflow flows as it goes outward. A virtual straight line LQ is formed on the trailing edge portion 74 of the wing portion 70P, similar to the fourth embodiment described above.

When the rectifying blade 40P is viewed from the side, the upstream edge portion 43 of the rectifying blade 40P extends in a direction perpendicular to the rotation axis 80. A virtual straight line LS is formed on the upstream edge portion 43 of the rectifying blade 40P, as in the fourth embodiment described above. The upstream edge portion 43 (virtual straight line LS) of the rectifying blade 40P extends toward the downstream side in the direction in which the air flows, than the trailing edge portion 74 (virtual straight line LQ) of the wing portion 70P.

Also in the case of this modification, looking at them in a direction perpendicular to the rotation axis 80 in a state where the trailing edge portion 74 of the wing portion 70P and the upstream edge portion 43 of the rectifying blade 40P are opposed to each other (again) In other words, when the propeller fan 50P is viewed from the side), when one of these is virtually moved along the direction parallel to the rotational axis 80 toward the other of them and brought into contact with each other, a gap is formed between them. .

Also in the case of this modification, the value of the angle difference θT, that is, the virtual straight line LS formed on the upstream edge portion 43 of the rectifying blade 40P and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70P When the angle formed by the LQ is 10 ° or more and 80 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing noise generated from the propeller fan 50P It becomes possible.

(Second modification)

69 is a cross-sectional view showing the propeller fan 50Q and the rectifying blade 40Q in the second modification of the fourth embodiment. The propeller fan 50Q has a boss part 60Q and a wing part 70Q. When the propeller fan 50Q is viewed from the side, the trailing edge portion 74 of the wing portion 70Q has a linear shape and extends along a direction perpendicular to the rotation shaft 80. A virtual straight line LQ is formed on the trailing edge portion 74 of the wing portion 70Q, similarly to the fourth embodiment described above.

When the rectifying blade 40Q is viewed from the side, the upstream rim portion 43 of the rectifying blade 40Q has a straight shape and extends toward the downstream side in the direction in which the air flows as it goes outward. A virtual straight line LS is formed on the upstream edge portion 43 of the rectifying blade 40Q, as in the above-described fourth embodiment. The upstream edge portion 43 (virtual straight line LS) of the rectifying blade 40Q extends toward the downstream side in the direction in which the air flows, than the trailing edge portion 74 (virtual straight line LQ) of the wing portion 70Q.

Also in the case of this modification, looking at them in a direction perpendicular to the rotating shaft 80 in a state where the trailing edge portion 74 of the wing portion 70Q and the upstream edge portion 43 of the rectifying blade 40Q are opposed to each other (again In other words, when the propeller fan 50Q is viewed from the side), when one of these is virtually moved along the direction parallel to the rotational axis 80 toward the other of them and brought into contact with each other, a gap is formed between them. .

Also in the case of this modification, the value of the angle difference θT, that is, the virtual straight line LS formed on the upstream edge portion 43 of the rectifying blade 40Q and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70Q. Since the angle formed by the LQ is 10 ° or more and 80 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing the noise generated from the propeller fan 50Q It becomes possible.

(Third variant)

70 is a cross-sectional view showing a propeller fan 50R and a rectifying blade 40R in the third modification of the fourth embodiment. The propeller fan 50R has a boss portion 60R and a wing portion 70R. When the propeller fan 50R is viewed from the side, the trailing edge portion 74 of the wing portion 70R has a straight shape and extends along a direction perpendicular to the rotation shaft 80. A virtual straight line LQ is formed on the trailing edge portion 74 of the wing portion 70R, similarly to the fourth embodiment described above.

When the rectifying blade 40R is viewed from the side, the upstream rim portion 43 of the rectifying blade 40R has a linear shape and extends toward the upstream side in the direction in which the air flows as it goes outward. A virtual straight line LS is formed on the upstream edge portion 43 of the rectifying blade 40R, as in the fourth embodiment described above. The upstream edge portion 43 (virtual straight line LS) of the rectifying blade 40R extends toward the upstream side in the direction in which air flows, than the trailing edge portion 74 (virtual straight line LQ) of the wing portion 70R.

Also in the case of this modification, looking at them in a direction perpendicular to the rotation axis 80 in a state where the trailing edge portion 74 of the wing portion 70R and the upstream edge portion 43 of the rectifying blade 40R are opposed to each other (again) In other words, when the propeller fan 50R is viewed from the side), when one of them is virtually moved along the direction parallel to the rotational axis 80 toward the other of them and brought into contact with each other, a gap is formed between them. .

Also in the case of this modification, the value of the angle difference θT, that is, the virtual straight line LS formed on the upstream edge portion 43 of the rectifying blade 40R and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70R Since the angle formed by the LQ is 10 ° or more and 80 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing the noise generated from the propeller fan 50R It becomes possible.

(Fourth modification)

71 is a cross-sectional view showing a propeller fan 50S and a rectifying blade 40S in the fourth modification example of the fourth embodiment. The propeller fan 50S has a boss portion 60S and a wing portion 70S. When the propeller fan 50S is viewed from the side, the trailing edge portion 74 of the wing portion 70S has a curved shape and extends toward the upstream side in the direction in which the air flows as it goes outward. A virtual straight line LQ is formed on the trailing edge portion 74 of the wing portion 70S, as in the fourth embodiment described above.

When the rectifying blade 40S is viewed from the side, the upstream rim portion 43 of the rectifying blade 40S has a linear shape and extends toward the downstream side in the direction in which the air flows as it goes outward. A virtual straight line LS is formed on the upstream edge portion 43 of the rectifying blade 40S, as in the above-described fourth embodiment. The upstream edge portion 43 (virtual straight line LS) of the rectifying blade 40S extends toward the downstream side in the direction in which the air flows, than the trailing edge portion 74 (virtual straight line LQ) of the wing portion 70S.

Also in the case of this modified example, looking at them in a direction perpendicular to the rotating shaft 80 in a state where the trailing edge portion 74 of the wing portion 70S and the upstream edge portion 43 of the rectifying blade 40S are opposed to each other (again) In other words, when the propeller fan 50S is viewed from the side), when one of these is virtually moved along the direction parallel to the rotational axis 80 toward the other of them and brought into contact with each other, a gap is formed between them. .

Also in the case of this modification, the value of the angle difference θT, that is, the virtual straight line LS formed on the upstream edge portion 43 of the rectifying blade 40S and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70S When the angle formed by the LQ is 10 ° or more and 80 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing noise generated from the propeller fan 50S It becomes possible.

(Fifth modification)

72 is a cross-sectional view showing a propeller fan 50T and a rectifying blade 40T in the fifth modification of the fourth embodiment. The propeller fan 50T has a boss portion 60T and a wing portion 70T. When the propeller fan 50T is viewed from the side, the trailing edge portion 74 of the wing portion 70T has a curved shape extending toward the downstream side in the direction in which the airflow flows, and the airflow flows as it goes outward. It is formed to be concave toward the upstream side of the direction. A virtual straight line LQ is formed on the trailing edge portion 74 of the wing portion 70T, similarly to the fourth embodiment described above.

When the rectifying blade 40T is viewed from the side, the upstream rim portion 43 of the rectifying blade 40T has a straight shape and extends toward the upstream side in the direction in which the air flows as it goes outward. A virtual straight line LS is formed on the upstream edge portion 43 of the rectifying blade 40T, as in the fourth embodiment described above. The upstream edge portion 43 (virtual straight line LS) of the rectifying blade 40T extends toward the upstream side in the direction in which the air flows, than the trailing edge portion 74 (virtual straight line LQ) of the wing portion 70T.

Also in the case of this modified example, looking at them in a direction perpendicular to the rotating shaft 80 in a state where the trailing edge portion 74 of the wing portion 70T and the upstream edge portion 43 of the rectifying blade 40T are opposed to each other (again In other words, when the propeller fan 50T is viewed from the side), when one of these is virtually moved along the direction parallel to the rotational axis 80 toward the other of them and brought into contact with each other, a gap is formed between them. .

Also in the case of this modification, the value of the angle difference θT, that is, the virtual straight line LS formed on the upstream edge portion 43 of the rectifying blade 40T and the virtual straight line formed on the trailing edge portion 74 of the wing portion 70T Since the angle formed by the LQ is 10 ° or more and 80 ° or less, it is difficult to generate a so-called peak sound because airflow can flow smoothly toward the downstream side. As a result, effectively suppressing noise generated from the propeller fan 50T It becomes possible.

(Sixth modification)

73 is a side view schematically showing a wing portion 70U1 and a rectifying blade 40U1 of a propeller fan according to a sixth modification example of the fourth embodiment. When the wing portion 70U1 of the propeller fan is viewed from the side, the trailing edge portion 74 of the wing portion 70U1 has an arcuate shape and is curved convex toward the downstream side in the direction in which the air flows. When the rectifying blade 40U1 is viewed from the side, the upstream rim 43 has a straight shape and extends in a direction perpendicular to the rotation axis 80.

Also in the case of this modification, looking at them in a direction perpendicular to the rotation axis 80 in a state where the trailing edge portion 74 of the wing portion 70U1 and the upstream edge portion 43 of the rectifying blade 40U1 face each other (again) In other words, when the propeller fan is viewed from the side), when one of them is virtually moved along the direction parallel to the rotation axis 80 (the direction of the arrow AR2) toward the other of them and brought into contact with each other, the gap S between them Is formed. Since the air flow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(Seventh modification)

74 is a side view schematically showing the wing portion 70U2 and the rectifying blade 40U2 of the propeller fan in the seventh modification of the fourth embodiment. When the wing portion 70U2 of the propeller fan is viewed from the side, the trailing edge portion 74 of the wing portion 70U2 has an arcuate shape and is curved in a concave shape toward the upstream side in the direction in which the air flows. When the rectifying blade 40U2 is viewed from the side, the upstream rim 43 has a straight shape.

Also in the case of this modification, looking at them in the direction perpendicular to the rotating shaft 80 in a state where the trailing edge portion 74 of the wing portion 70U2 and the upstream edge portion 43 of the rectifying blade 40U2 are opposed to each other (again) In other words, when the propeller fan is viewed from the side), when one of them is virtually moved along the direction parallel to the rotation axis 80 (the direction of the arrow AR2) toward the other of them and brought into contact with each other, the gap S between them Is formed. Since the airflow can flow smoothly toward the downstream side, so-called peak sounds are hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(Example 8)

75 is a side view schematically showing the wing portion 70U3 and the rectifying blade 40U3 of the propeller fan in the eighth modification example of the fourth embodiment. When the wing portion 70U3 of the propeller fan is viewed from the side, the trailing edge portion 74 of the wing portion 70U3 has a curved shape and is formed so as to protrude toward the downstream side in the direction in which the air flows as it goes outward. The part of the radial direction of rotation is formed to be concave toward the upstream side in the direction in which the air flows. When the rectifying blade 40U3 is viewed from the side, the upstream rim 43 has a straight shape.

Also in the case of this modification, looking at them in the direction perpendicular to the rotating shaft 80 in a state where the trailing edge portion 74 of the wing portion 70U3 and the upstream edge portion 43 of the rectifying blade 40U3 are opposed to each other (again) In other words, when the propeller fan is viewed from the side), when one of them is virtually moved along the direction parallel to the rotation axis 80 (the direction of the arrow AR2) toward the other of them and brought into contact with each other, the gap S between them Is formed. Since the air flow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(9th modification)

76 is a side view schematically showing the wing portion 70U4 and the rectifying blade 40U4 of the propeller fan in the ninth modification example of the fourth embodiment. When the wing portion 70U4 of the propeller fan is viewed from the side, the trailing edge portion 74 of the wing portion 70U4 has a curved shape, and a part of the radial direction of rotation protrudes toward the downstream side in the direction in which the airflow flows. Is formed. When the rectifying blade 40U4 is viewed from the side, the upstream rim 43 has an arcuate shape and is curved convex toward the upstream side in the direction in which the air flows.

Also in the case of this modification, looking at them in a direction perpendicular to the rotation axis 80 in a state where the trailing edge portion 74 of the wing portion 70U4 and the upstream edge portion 43 of the rectifying blade 40U4 are opposed to each other (again) In other words, when the propeller fan is viewed from the side), when one of them is virtually moved along the direction parallel to the rotation axis 80 (the direction of the arrow AR2) toward the other of them and brought into contact with each other, the gap S between them Is formed. Since the air flow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(Third modification)

77 is a side view schematically showing the wing portion 70U5 and the rectifying blade 40U5 of the propeller fan in the tenth modification example of the fourth embodiment. When the wing portion 70U5 of the propeller fan is viewed from the side, the trailing edge portion 74 of the wing portion 70U5 has an arcuate shape and is curved convex toward the downstream side in the direction in which the air flows. When the rectifying blade 40U5 is viewed from the side, the upstream rim 43 has an arcuate shape and is curved convex toward the upstream side in the direction in which the air flows.

Also in the case of this modified example, looking at them in a direction perpendicular to the rotating shaft 80 in a state where the trailing edge portion 74 of the wing portion 70U5 and the upstream edge portion 43 of the rectifying blade 40U5 are opposed to each other (again) In other words, when the propeller fan is viewed from the side), when one of them is virtually moved along the direction parallel to the rotation axis 80 (the direction of the arrow AR2) toward the other of them and brought into contact with each other, the gap S between them Is formed. Since the air flow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(11th modified example)

78 is a side view schematically showing the wing portion 70U6 and the rectifying blade 40U6 of the propeller fan in the eleventh modification of the fourth embodiment. When the wing portion 70U6 of the propeller fan is viewed from the side, the trailing edge portion 74 of the wing portion 70U6 has a linear shape and extends along a direction orthogonal to the rotation shaft 80. When the rectifying blade 40U6 is viewed from the side, the upstream rim 43 has an arcuate shape and is curved convex toward the upstream side in the direction in which the air flows.

Also in the case of this modification, looking at them in the direction perpendicular to the rotating shaft 80 in a state where the trailing edge portion 74 of the wing portion 70U6 and the upstream edge portion 43 of the rectifying blade 40U6 are opposed to each other (again In other words, when the propeller fan is viewed from the side), when one of them is virtually moved along the direction parallel to the rotation axis 80 (the direction of the arrow AR2) toward the other of them and brought into contact with each other, the gap S between them Is formed. Since the airflow can flow smoothly toward the downstream side, so-called peak sounds are hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(12th modified example)

79 is a side view schematically showing the wing portion 70U7 and the rectifying blade 40U7 of the propeller fan in the twelfth modification of the fourth embodiment. When the wing portion 70U7 of the propeller fan is viewed from the side, the trailing edge portion 74 of the wing portion 70U7 has a linear shape and extends along a direction orthogonal to the rotation shaft 80. When the rectifying blade 40U7 is viewed from the side, the upstream rim 43 has an arcuate shape and is curved in a concave shape toward the downstream side in the direction in which the air flows.

Also in the case of this modified example, looking at them in a direction perpendicular to the rotating shaft 80 in a state where the trailing edge portion 74 of the wing portion 70U7 and the upstream edge portion 43 of the rectifying blade 40U7 are opposed to each other (again In other words, when the propeller fan is viewed from the side), when one of them is virtually moved along the direction parallel to the rotation axis 80 (the direction of the arrow AR2) toward the other of them and brought into contact with each other, the gap S between them Is formed. Since the air flow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(13th modification)

80 is a side view schematically showing the wing portion 70U8 and the rectifying blade 40U8 of the propeller fan in the thirteenth modification of the fourth embodiment. When the wing portion 70U8 of the propeller fan is viewed from the side, the trailing edge portion 74 of the wing portion 70U8 has a curved shape, and a part of the radial direction of rotation is concave toward the upstream side in the direction in which the airflow flows. Is formed. When the rectifying blade 40U8 is viewed from the side, the upstream rim 43 has a straight shape.

Also in the case of this modification, looking at them in a direction perpendicular to the rotation axis 80 in a state where the trailing edge portion 74 of the wing portion 70U8 and the upstream edge portion 43 of the rectifying blade 40U8 are opposed to each other (again In other words, when the propeller fan is viewed from the side), when one of them is virtually moved along the direction parallel to the rotation axis 80 (the direction of the arrow AR2) toward the other of them and brought into contact with each other, the gap S between them Is formed. Since the air flow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(Variation 14)

81 is a side view schematically showing the wing portion 70U9 and the rectifying blade 40U9 of the propeller fan according to the fourteenth modification of the fourth embodiment. When the wing portion 70U9 of the propeller fan is viewed from the side, the trailing edge portion 74 of the wing portion 70U9 has an arcuate shape and is curved in a concave shape toward the upstream side in the direction in which the air flows. When the rectifying blade 40U9 is viewed from the side, the upstream rim 43 has an arcuate shape and is curved in a concave shape toward the downstream side in the direction in which the air flows.

Also in the case of this modified example, looking at them in a direction perpendicular to the rotation axis 80 in a state where the trailing edge portion 74 of the wing portion 70U9 and the upstream edge portion 43 of the rectifying blade 40U9 are opposed to each other (again) In other words, when the propeller fan is viewed from the side), when one of them is virtually moved along the direction parallel to the rotation axis 80 (the direction of the arrow AR2) toward the other of them and brought into contact with each other, the gap S between them Is formed. Since the air flow can flow smoothly toward the downstream side, so-called peak sound is hardly generated, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

(Other modified examples)

In each of the above-described embodiments and each modification, the propeller fan and the rectifying blade used in the blower may be provided with only the features according to the above-described third embodiment (including each modification), and the above-described embodiment Only features according to 4 (including each modification) may be provided, or both of these features may be provided. When the blower is equipped with both features of the third and fourth embodiments, noise generation can be further reduced.

If the number of blades used in the propeller fan is M and the number of rectifying blades is N, both M and N are prime numbers, and a relationship of 2M ± 1 = N or 2N ± 1 = M may be established. For example, when the number M of wings is three, the number N of rectifying wings may be seven. Examples of other combinations include 7 and 13, 3 and 5, 5 and 11, and the like. When this relationship is established, the peak sound is less likely to occur, and as a result, it is possible to effectively suppress noise generated from the propeller fan.

In each of the above-described embodiments and respective modifications, the blower may be provided with an ion generating portion inside the body portion 10 (see FIG. 9). By putting ions in the wind sent by the propeller fan, it is possible to impart wettability and gloss to the hair and scalp. In addition, the generation of static electricity by the ions may be suppressed and the damage to the hair may be reduced.

In each of the above-described embodiments and respective modifications, the blower may be provided with a light-emitting portion. In this case, the light emitting unit includes a light source such as an LED (light emitting diode) disposed in the main body 10 (see FIG. 9) and a light guiding member formed of a synthetic resin material having light transmittance such as acrylic for guiding light of the light source. Have

This light emitting unit can be used as a display means of the operation mode of the blower as a hair dryer. For example, an operating state such as red in a state in which hot air is being blown by using a heater, green in a state in which cold air is being blown without using a heater, and blue in a state in which an ion emitting part is operating and ions are being discharged, etc. Depending on the color can be changed. In this case, a plurality of light sources corresponding to each color are mounted, and the control circuit controls light emission of the plurality of light sources. It is also possible to blink the light source by the control circuit, to control the blinking interval, or to change the light emission intensity, and it is also possible to set these light emission modes in correspondence with various operation modes.

[bookkeeping]

Each of the above-described embodiments can be summarized as follows.

(Annex 1)

A wind path forming member including an inlet and an outlet, and

A drive motor including an output shaft and installed inside the air passage forming member,

It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,

The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,

The outer surface of the boss portion,

An upstream end most located on the upstream side,

An upstream surface that is continuous to the upstream end and extends outward in the radial direction of rotation of the propeller fan as it faces the downstream side,

A downstream portion located on the downstream side of the downstream end of the upstream surface,

A downstream surface connecting the downstream end of the upstream surface and the downstream part

Including,

The downstream surface has a shape extending along a direction parallel to the rotation axis, or a shape extending toward the inside of the rotational radial direction than the parallel direction toward the downstream portion.

(Bookkeeping 2)

A wind path forming member including an inlet and an outlet, and

A drive motor including an output shaft and installed inside the air passage forming member,

It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,

The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,

The outer surface of the boss portion,

An upstream end located at the most upstream side and having a planar shape,

A shape that is continuous to the outer edge of the upstream end and extends in a direction parallel to the rotation axis, or a shape extending toward the inner side in the radial direction of rotation of the propeller fan as directed toward the downstream side. Upstream surface having,

A downstream portion located on the downstream side of the downstream end of the upstream surface,

And a downstream surface connecting the downstream end of the upstream surface and the downstream portion,

The downstream surface has a shape extending toward the inner side of the radial direction of rotation rather than the parallel direction toward the downstream portion.

(Annex 3)

The upstream surface has a shape of a substantially conical surface that expands in diameter as it faces the downstream side,

The blowing device according to Appendix 1, wherein the downstream surface has a shape extending along the parallel direction with respect to the rotation axis.

(Annex 4)

The blowing device according to Annex 3, wherein the inner cabinet at the upstream end of the boss portion is 50 ° or more.

(Bookkeeping 5)

If the height dimension in the parallel direction with respect to the rotation axis of the upstream surface is H, and the height dimension in the parallel direction with respect to the rotation axis of the downstream surface is h, h / (H + h ) Has a value of 1/5 or more, the blowing device according to any one of notes 1 to 4.

(Bookkeeping 6)

The upstream surface has a shape of a substantially conical surface that expands in diameter as it faces the downstream side,

The blower according to Appendix 1, wherein the downstream surface has a shape of a substantially conical surface that shrinks in diameter as it faces the downstream side.

(Bookkeeping 7)

The blowing device according to any one of notes 1 to 6, wherein the outer surface of the boss portion is formed to be curved from the upstream surface toward the downstream surface.

(Bookkeeping 8)

The blowing device according to any one of notes 1 to 6, wherein the outer surface of the boss portion is formed to bend from the upstream surface toward the downstream surface.

(Bookkeeping 9)

The wing portion,

A blade tip positioned at the tip of the propeller fan in the rotational direction;

A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;

A trailing edge portion extending from the outer surface of the boss portion toward the outer side in the rotational radial direction and forming a rear edge of the wing portion in the rotational direction;

An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,

In the parallel direction with respect to the rotational axis, the height dimension between the position of the most downstream side in the wing portion and the root position of the leading edge portion is called ha, and the position of the most downstream side in the wing portion If the height dimension between the position of the tip of the blade and hb is hb, the value of hb / ha is 1.5 or more, the blowing device according to any one of Supplements 1 to 8.

(Bookkeeping 10)

The wing portion,

A blade tip positioned at the tip of the propeller fan in the rotational direction;

A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;

A trailing edge portion extending from the outer surface of the boss portion toward the outer side in the rotational radial direction and forming a rear edge of the wing portion in the rotational direction;

An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,

The air passage forming member,

The inner wall part,

Has a concave portion formed to be concave from the inner wall portion,

In the direction parallel to the axis of rotation, the most downstream side of the recess is located at the upstream side than the most downstream side of the boss portion, and further downstream of the wing tip of the wing portion. And

The blower according to any one of Supplementary Notes 1 to 8, wherein in the direction parallel to the rotation axis, the most upstream portion of the concave portion is located on the upstream side of the wing tip portion of the wing portion.

(Bookkeeping 11)

The wing portion,

A blade tip positioned at the tip of the propeller fan in the rotational direction;

A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;

A trailing edge portion extending from the outer surface of the boss portion toward the outer side in the rotational radial direction and forming a rear edge of the wing portion in the rotational direction;

An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,

The air passage forming member,

A first inner wall portion,

Located on the downstream side than the first inner wall portion, and has a second inner wall portion having a narrower passage area than the first inner wall portion,

In the direction parallel to the rotation axis, the most upstream portion of the second inner wall portion is located on the upstream side of the most downstream portion of the boss portion, and further downstream of the wing tip portion of the wing portion. The blowing device according to any one of Supplementary Notes 1 to 8, which is located at.

(Bookkeeping 12)

The said outer periphery part has the shape extended toward the inside from the outer side in the said rotational radial direction as it faces the said blade tip part, The blower apparatus in any one of annexes 9-11.

(Bookkeeping 13)

When the propeller fan is rotating, a portion of the wing portion near the tip of the blade is elastically deformed by the action of centrifugal force, and a portion near the tip of the blade of the outer periphery is rotated to substantially follow the circumferential direction. Blower according to Annex 12.

(Bookkeeping 14)

It is disposed on the downstream side than the propeller fan, and further comprising a rectifying blade having an upstream edge portion on the upstream side,

Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while viewing them in a direction perpendicular to the rotation axis in a state in which they are opposed to each other, the one of them toward the other side of the parallel to the rotation axis A shape in which gaps are formed between them when they are virtually moved along one direction and brought into contact with each other, and / or when they are viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other, only a part of them cross each other. The blowing device according to any one of notes 10 to 13, having a shape.

(Bookkeeping 15)

When viewed from the direction perpendicular to the axis of rotation,

A first virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,

A second virtual straight line is formed so as to connect the innermost part of the upstream rim of the rectifying blade in the rotational radial direction and the outermost part of the upstream rim of the rectifying blade in the rotating radial direction,

The blowing device according to Annex 14, wherein the angle formed by the first virtual straight line and the second virtual straight line is 10 ° or more and 80 ° or less.

(Bookkeeping 16)

When viewed from the parallel direction with respect to the axis of rotation,

A third virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,

A fourth virtual straight line is formed so as to connect the innermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction and the outermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction,

The blowing device according to Annex 14 or 15, wherein the angle formed by the third virtual straight line and the fourth virtual straight line is 10 ° or more and 90 ° or less.

(Bookkeeping 17)

Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while looking at them in the perpendicular direction with respect to the rotation axis in a state where they are opposed to each other, the one of them toward the other side of the A shape in which gaps are formed between them when they are virtually moved along a parallel direction to contact each other, and a shape in which only a part of them intersect when viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other. The blowing device according to any one of Supplementary Notes 14 to 16.

(Bookkeeping 18)

If the number of wings is M, and the number of rectification wings is N,

The blowing device according to any one of notes 14 to 17, wherein both M and N are prime numbers and a relationship of 2M ± 1 = N or 2N ± 1 = M is established.

(Bookkeeping 19)

The blowing device according to any one of notes 14 to 18, wherein in the direction parallel to the rotation axis, the narrowest gap formed between the wing portion and the rectifying blade is 3 mm or less.

(Bookkeeping 20)

The blower according to any one of Supplements 1 to 19, wherein in the direction parallel to the rotation axis, the output shaft is located on the upstream side of the boss portion at the most downstream portion.

(Bookkeeping 21)

A wind path forming member including an inlet and an outlet, and

A drive motor including an output shaft and installed inside the air passage forming member,

It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,

The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,

The wing portion,

A blade tip positioned at the tip of the propeller fan in the rotational direction;

A leading edge portion extending from the tip end of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;

A trailing edge portion extending from the outer surface of the boss portion toward the outside in the radial direction of rotation of the propeller fan, and forming a rear edge of the wing portion in the rotation direction;

An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,

In the direction parallel to the rotation axis, the height dimension between the most downstream position and the leading edge position in the blade section is called ha, and the most downstream position in the wing section is If the height dimension between the positions of the tip of the wing is hb, the value of hb / ha is 1.5 or more, and the blowing device.

(Bookkeeping 22)

A wind path forming member including an inlet and an outlet, and

A drive motor including an output shaft and installed inside the air passage forming member,

It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,

The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,

The wing portion,

A blade tip positioned at the tip of the propeller fan in the rotational direction;

A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;

A trailing edge portion extending from the outer surface of the boss portion toward the outside in the radial direction of rotation of the propeller fan, and forming a rear edge of the wing portion in the rotation direction;

An outer periphery that connects the front end of the wing and the outer end of the trailing edge, and forms an outer periphery of the wing in the radial direction of rotation,

The air passage forming member,

The inner wall part,

Has a concave portion formed to be concave from the inner wall portion,

In the direction parallel to the rotational axis, the most downstream side of the recess is located on the upstream side of the boss portion most downstream, and further on the downstream side of the wing portion of the wing tip. ,

In the direction parallel to the rotation axis, the most upstream portion of the concave portion is located on the upstream side of the blade tip than the blade tip portion.

(Bookkeeping 23)

A wind path forming member including an inlet and an outlet, and

A drive motor including an output shaft and installed inside the air passage forming member,

It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,

The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,

The wing portion,

A blade tip positioned at the tip of the propeller fan in the rotational direction;

A leading edge portion extending from the tip end of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;

A trailing edge portion extending from the outer surface of the boss portion toward the outside in the radial direction of rotation of the propeller fan, and forming a rear edge of the wing portion in the rotation direction;

An outer periphery that connects the front end of the wing and the outer end of the trailing edge, and forms an outer periphery of the wing in the radial direction of rotation,

The air passage forming member,

A first inner wall portion,

Located on the downstream side than the first inner wall portion, and has a second inner wall portion having a narrower passage area than the first inner wall portion,

In the direction parallel to the rotation axis, the most upstream portion of the second inner wall portion is located on the upstream side of the most downstream portion of the boss portion, and further on the downstream side of the wing tip portion of the wing portion. Located, blower.

(Bookkeeping 24)

The said outer periphery part has the shape extended toward the inside from the outer side in the said rotational radial direction as it faces the said blade tip part, The blowing apparatus in any one of annexes 21-23.

(Bookkeeping 25)

When the propeller fan is rotating, a portion of the wing portion near the tip of the blade is elastically deformed by the action of centrifugal force, and a portion near the tip of the blade of the outer periphery is rotated to substantially follow the circumferential direction. Blower according to Annex 24.

(Bookkeeping 26)

The outer surface of the boss portion,

An upstream end most located on the upstream side,

An upstream surface which is continuous to the upstream end and extends toward the outside in the radial direction of the propeller fan as it faces the downstream side,

A downstream portion located on the downstream side of the downstream end of the upstream surface,

And a downstream surface connecting the downstream end of the upstream surface and the downstream portion,

The downstream surface has a shape extending along the parallel direction with respect to the rotation axis, or a shape extending toward the inside of the rotational radial direction than the parallel direction toward the downstream portion. The blower described in any one.

(Bookkeeping 27)

The outer surface of the boss portion,

The upper end which is located at the most upstream side and has a planar shape,

It is continuous to the outer rim of the upstream end and extends along the parallel direction with respect to the axis of rotation, or extends toward the inside of the rotational radial direction of the propeller fan than toward the parallel direction toward the downstream side. An upstream surface having a shape of

A downstream portion located on the downstream side of the downstream end of the upstream surface,

And a downstream surface connecting the downstream end of the upstream surface and the downstream portion,

The blower according to any one of annexes 21 to 25, wherein the downstream surface has a shape extending toward the inside of the rotational radial direction rather than the parallel direction toward the downstream portion.

(Bookkeeping 28)

The upstream surface has a shape of a substantially conical surface that expands in diameter as it faces the downstream side,

The blowing device according to Annex 26, wherein the downstream surface has a shape extending along the parallel direction with respect to the rotation axis.

(Bookkeeping 29)

The cabinet at the upstream end of the boss portion is 50 ° or more,

Blower according to Annex 28.

(Bookkeeping 30)

If the height dimension in the parallel direction with respect to the rotation axis of the upstream surface is H, and the height dimension in the parallel direction with respect to the rotation axis of the downstream surface is h, h / (H + h ) Has a value of 1/5 or more, the blowing device according to any one of notes 26 to 29.

(Bookkeeping 31)

The upstream surface has a shape of a substantially conical surface that expands in diameter as it faces the downstream side,

The blowing device according to note 26, wherein the downstream surface has a shape of a substantially conical surface that shrinks in diameter as it faces the downstream side.

(Bookkeeping 32)

The blowing device according to any one of notes 26 to 31, wherein the outer surface of the boss portion is formed to be curved from the upstream surface toward the downstream surface.

(Bookkeeping 33)

The blowing device according to any one of notes 26 to 31, wherein the outer surface of the boss portion is formed to bend from the upstream surface toward the downstream surface.

(Bookkeeping 34)

It is disposed on the downstream side than the propeller fan, and further comprising a rectifying blade having an upstream edge portion on the upstream side,

Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while viewing them in a direction perpendicular to the rotation axis in a state in which they are opposed to each other, the one of them toward the other side of the parallel to the rotation axis A shape in which gaps are formed between them when they are virtually moved along one direction and brought into contact with each other, and / or when they are viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other, only a part of them cross each other. The blowing device according to any one of notes 26 to 33, having a shape.

(Bookkeeping 35)

When viewed from the direction perpendicular to the axis of rotation,

A first virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,

A second virtual straight line is formed so as to connect the innermost part of the upstream rim of the rectifying blade in the rotational radial direction and the outermost part of the upstream rim of the rectifying blade in the rotating radial direction,

The blowing device according to Annex 34, wherein the angle formed by the first virtual straight line and the second virtual straight line is 10 ° or more and 80 ° or less.

(Bookkeeping 36)

When viewed from the parallel direction with respect to the axis of rotation,

A third virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,

A fourth virtual straight line is formed so as to connect the innermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction and the outermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction,

The blowing device according to Annex 34 or 35, wherein the angle formed by the third virtual straight line and the fourth virtual straight line is 10 ° or more and 90 ° or less.

(Bookkeeping 37)

Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while looking at them in the perpendicular direction with respect to the rotation axis in a state where they are opposed to each other, the one of them toward the other side of the A shape in which a gap is formed between them when virtually moving along a parallel direction and contacting each other, and a shape in which only a part of them intersect when viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other The blowing device according to any one of notes 34 to 36.

(Bookkeeping 38)

If the number of wings is M, and the number of rectification wings is N,

Both M and N are prime numbers, and the blowing device according to any one of notes 34 to 37, wherein a relationship of 2M ± 1 = N or 2N ± 1 = M is established.

(Bookkeeping 39)

The blower according to any one of Annex 34 to 38, wherein the narrowest gap formed between the blade portion and the rectifying blade in the direction parallel to the rotation axis is 3 mm or less.

(Bookkeeping 40)

The blower according to any one of annexes 21 to 39, wherein in the direction parallel to the rotation axis, the output shaft is located on the upstream side of the boss portion at the most downstream portion.

(Bookkeeping 41)

A wind path forming member including an inlet and an outlet, and

A drive motor including an output shaft and installed inside the air passage forming member,

It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,

The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,

It is disposed on the downstream side than the propeller fan, and further comprising a rectifying blade having an upstream edge portion on the upstream side,

The wing portion,

A blade tip positioned at the tip of the propeller fan in the rotational direction;

A leading edge portion extending from the tip end of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;

A trailing edge portion extending from the outer surface of the boss portion toward the outside in the radial direction of rotation of the propeller fan, and forming a rear edge of the wing portion in the rotation direction;

An outer periphery that connects the front end of the wing and the outer end of the trailing edge, and forms an outer periphery of the wing in the radial direction of rotation,

Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade is parallel to the rotation axis toward one of them while looking at them in a direction perpendicular to the rotation axis in a state where they face each other. A shape in which gaps are formed between them when they are virtually moved along a direction to contact each other, and / or a shape where only a part of them intersect when they are viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other Having a blower.

(Bookkeeping 42)

When viewed from the direction perpendicular to the axis of rotation,

A first virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,

A second virtual straight line is formed so as to connect the innermost part of the upstream rim of the rectifying blade in the rotational radial direction and the outermost part of the upstream rim of the rectifying blade in the rotating radial direction,

The blowing device according to Appendix 1, wherein the angle formed by the first virtual straight line and the second virtual straight line is 10 ° or more and 80 ° or less.

(Bookkeeping 43)

When viewed from the parallel direction with respect to the axis of rotation,

A third virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,

A fourth virtual straight line is formed so as to connect the innermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction and the outermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction,

The blowing device according to Annex 41 or 42, wherein the angle formed by the third virtual straight line and the fourth virtual straight line is 10 ° or more and 90 ° or less.

(Bookkeeping 44)

Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while looking at them in the perpendicular direction with respect to the rotation axis in a state where they are opposed to each other, the one of them toward the other side of the A shape in which a gap is formed between them when virtually moving along a parallel direction and contacting each other, and a shape in which only a part of them intersect when viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other The blowing device according to any one of Appendixes 41 to 43.

(Bookkeeping 45)

If the number of wings is M, and the number of rectification wings is N,

The blowing device according to any one of annexes 41 to 44, wherein both M and N are prime numbers and a relationship of 2M ± 1 = N or 2N ± 1 = M is established.

(Bookkeeping 46)

The blower according to any one of annexes 41 to 45, wherein in the parallel direction with respect to the rotation axis, the narrowest gap formed between the wing portion and the rectifying blade is 3 mm or less.

(Bookkeeping 47)

The blower according to any one of annexes 41 to 46, wherein in the direction parallel to the rotation axis, the output shaft is located on the upstream side of the boss portion at the most downstream portion.

(Bookkeeping 48)

In the parallel direction with respect to the rotational axis, the height dimension between the position of the most downstream side in the wing portion and the root position of the leading edge portion is called ha, and the position of the most downstream side in the wing portion If the height dimension between the position of the tip of the blade and hb is hb, the value of hb / ha is 1.5 or more, the blowing device according to any one of annexes 41 to 47.

(Bookkeeping 49)

The air passage forming member,

The inner wall part,

Has a concave portion formed to be concave from the inner wall portion,

In the direction parallel to the axis of rotation, the most downstream side of the recess is located at the upstream side than the most downstream side of the boss portion, and further downstream of the wing tip of the wing portion. And

The blower according to any one of annexes 41 to 47, in the direction parallel to the rotation axis, the most upstream portion of the concave portion is located on the upstream side of the wing tip portion of the wing portion.

(Bookkeeping 50)

The air passage forming member,

A first inner wall portion,

Located on the downstream side than the first inner wall portion, and has a second inner wall portion having a narrower passage area than the first inner wall portion,

In the direction parallel to the rotation axis, the most upstream portion of the second inner wall portion is located on the upstream side of the most downstream portion of the boss portion, and further downstream of the wing tip portion of the wing portion. The blower device as described in any one of annexes 41-47 located in.

(Bookkeeping 51)

The blower according to any one of Supplements 48 to 50, wherein the outer periphery has a shape that extends from the outside in the radial direction toward the inside in the direction of the blade tip.

(Bookkeeping 52)

When the propeller fan is rotating, a portion of the wing portion near the tip of the blade is elastically deformed under the action of centrifugal force, and a portion near the tip of the blade of the outer periphery is rotated to substantially follow the circumferential direction. The blowing device according to Appendix 51.

(Bookkeeping 53)

The outer surface of the boss portion,

An upstream end most located on the upstream side,

An upstream surface which is continuous to the upstream end and extends toward the outside in the radial direction of the propeller fan as it faces the downstream side,

A downstream portion located on the downstream side of the downstream end of the upstream surface,

And a downstream surface connecting the downstream end of the upstream surface and the downstream portion,

The downstream surface has a shape extending along the parallel direction with respect to the rotation axis, or a shape extending toward the inside of the rotational radial direction than the parallel direction toward the downstream portion. The blower described in any one.

(Bookkeeping 54)

The outer surface of the boss portion,

The upper end which is located at the most upstream side and has a planar shape,

It is continuous to the outer rim of the upstream end and extends along the parallel direction with respect to the axis of rotation, or extends toward the inside of the rotational radial direction of the propeller fan than toward the parallel direction toward the downstream side. An upstream surface having a shape of

A downstream portion located on the downstream side of the downstream end of the upstream surface,

And a downstream surface connecting the downstream end of the upstream surface and the downstream portion,

The blower according to any one of annexes 41 to 52, wherein the downstream surface has a shape extending toward the inside of the rotational radial direction rather than the parallel direction toward the downstream portion.

(Bookkeeping 55)

The upstream surface has a shape of a substantially conical surface that expands in diameter as it faces the downstream side,

The blower device according to note 53, wherein the downstream surface has a shape extending along the parallel direction with respect to the rotation axis.

(Bookkeeping 56)

The blowing device according to annex 55, wherein the cabinet at the upstream end of the boss portion is 50 ° or more.

(Bookkeeping 57)

If the height dimension in the parallel direction with respect to the rotation axis of the upstream surface is H, and the height dimension in the parallel direction with respect to the rotation axis of the downstream surface is h, h / (H + h ) Has a value of 1/5 or more, as described in any one of annexes 53 to 56.

(Bookkeeping 58)

The upstream surface has a shape of a substantially conical surface that expands in diameter as it faces the downstream side,

The blowing device according to note 53, wherein the downstream surface has a shape of a substantially conical surface that shrinks in diameter as it faces the downstream side.

(Bookkeeping 59)

The blowing device according to any one of notes 53 to 58, wherein the outer surface of the boss portion is formed to be curved from the upstream surface toward the downstream surface.

(Bookkeeping 60)

The blowing device according to any one of notes 53 to 58, wherein the outer surface of the boss portion is formed to bend from the upstream surface toward the downstream surface.

In the above, each embodiment and each experimental example based on the present invention have been described, but each embodiment and each experimental example disclosed this time is an example in all respects and is not restrictive. The technical scope of the present invention is described by the claims, and is intended to include all changes within the meaning and range equivalent to the claims.

10: main body
11: outer case
12, 12A, 12B: inner case (furnace forming member)
12A1: Inner wall part
12B1: first inner wall part
12B2: second inner wall part
12BB, 12W1, 12W2, 47, 48, 79: part
12W: recess
13: entrance opening
14: exit opening
15: inlet
16: outlet
17: heater
20: gripping part
21: tip
22: rear end
23: Control panel
24: power cord
30: drive motor
31: output shaft
40, 40K, 40L1, 40L2, 40L3, 40L4, 40L5, 40L6, 40L7, 40N, 40P, 40Q, 40R, 40S, 40T, 40U1, 40U2, 40U3, 40U4, 40U5, 40U6, 40U7, 40U8, 40U9, 40Z: Commutator wings
42: plate shape
43: upstream border
44: motor support
44A: Perimeter wall
44B: Bottom Wall
44C: hole
46: Fantasy Wall
50, 50H, 50J, 50K, 50L1, 50L2, 50L3, 50L4, 50L5, 50L6, 50L7, 50N, 50P, 50Q, 50R, 50S, 50T, 50Z, 50Z1, 50Z2: Propeller fan
60, 60A, 60B1, 60B2, 60B3, 60B4, 60C, 60D1, 60D2, 60D3, 60E1, 60E2, 60E3, 60F, 60G, 60H, 60J, 60K, 60L1, 60L2, 60L3, 60L4, 60L5, 60L6, 60L7, 60N, 60P, 60Q, 60R, 60S, 60T, 60Z, 60Z1, 60Z2, 60ZA, 60ZB: Boss section
61: outer surface
62: upstream end
62T: outer rim
63: mainstream
64: upstream side
65: downstream end
66: downstream
66A: 1st downstream side
66B: Second downstream
67: downstream
68: inner surface
69: bearing
70, 70H, 70J, 70K, 70L1, 70L2, 70L3, 70L4, 70L5, 70L6, 70L7, 70M1, 70M2, 70M3, 70M4, 70M5, 70M6, 70M7, 70M8, 70M9, 70N, 70P, 70Q, 70R, 70S, 70T, 70U1, 70U2, 70U3, 70U4, 70U5, 70U6, 70U7, 70U8, 70U9, 70Z, 70Z1, 70Z2: wing
71: wing tip
72: leading edge
72H: Source
73: Origin
74: trailing edge
75: rear end of the wing
76: Outsourcing
80: rotating shaft
100, 200: blower
AR1: Arrow (rotation direction)
AR2, DR1, DR2, DR3, DR4, DR5, DR6, DR10, DR50: Arrow
C10: Won
CL: Minimum clearance
D1, D2: outer diameter
Hh, ha, haz, hb, hbz, R1, R2: dimensions
L1, L2, L3, L4, L5, L6, L10, L20, L21, L30, L31, L40, L41, LL1: Line
LA, LC, LP, LR: baseline
LB: Virtual straight line (third virtual straight line)
LD: Virtual straight line (4th virtual straight line)
LQ: Virtual straight line (first virtual straight line)
LS: Virtual straight line (second virtual straight line)
LL2: extension
S: clearance
W10, W11: width
θ1, θ2: Cabinet
θ10, θ11: incident angle
θA, θB, θP, θQ: angle
θC, θT: angle difference

Claims (60)

A wind path forming member including an inlet and an outlet, and
A drive motor including an output shaft and installed inside the air passage forming member,
It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,
The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,
The outer surface of the boss portion,
An upstream end most located on the upstream side,
An upstream surface that is continuous to the upstream end and extends outward in the radial direction of rotation of the propeller fan as it faces the downstream side,
A downstream portion located on the downstream side of the downstream end of the upstream surface,
A downstream surface connecting the downstream end of the upstream surface and the downstream part
Including,
The downstream surface has a shape extending along a direction parallel to the rotation axis, or a shape extending toward the inside of the rotational radius direction than the parallel direction toward the downstream portion,
The wing portion,
A blade tip positioned at the tip of the propeller fan in the rotational direction;
A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;
A trailing edge portion extending from the outer surface of the boss portion toward the outer side in the rotational radial direction and forming a rear edge of the wing portion in the rotational direction;
An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,
In the parallel direction with respect to the rotation axis, when comparing the height of each of the upstream surface and the downstream surface, the height of the upstream surface is higher than the height of the downstream surface,
The leading edge root portion, which is the origin of the leading edge portion, is connected to the boss portion at the upstream surface, the trailing edge root portion source, which is the origin of the trailing edge portion, is connected to the boss portion at the downstream side, and the leading edge root portion is rotated more than the trailing edge portion. A blower that is installed inside in a radial direction. A wind path forming member including an inlet and an outlet, and
A drive motor including an output shaft and installed inside the air passage forming member,
It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,
The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,
The outer surface of the boss portion,
The upper end which is located at the most upstream side and has a planar shape,
A shape that is continuous to the outer edge of the upstream end and extends in a direction parallel to the rotation axis, or a shape extending toward the inner side in the radial direction of rotation of the propeller fan as directed toward the downstream side. Upstream surface having,
A downstream portion located on the downstream side of the downstream end of the upstream surface,
A downstream surface connecting the downstream end of the upstream surface and the downstream part
Including,
The downstream surface has a shape that extends toward the inside of the rotational radial direction rather than the parallel direction toward the downstream portion,
The wing portion,
A blade tip positioned at the tip of the propeller fan in the rotational direction;
A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;
A trailing edge portion extending from the outer surface of the boss portion toward the outer side in the rotational radial direction and forming a rear edge of the wing portion in the rotational direction;
An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,
In the parallel direction with respect to the rotation axis, when comparing the height of each of the upstream surface and the downstream surface, the height of the upstream surface is higher than the height of the downstream surface,
The leading edge root portion, which is the origin of the leading edge portion, is connected to the boss portion at the upstream surface, the trailing edge root portion source, which is the origin of the trailing edge portion, is connected to the boss portion at the downstream side, and the leading edge root portion is rotated more than the trailing edge portion. A blower that is installed inside in a radial direction. According to claim 1,
The upstream surface has a shape of a conical surface that expands in diameter as it faces the downstream side,
The downstream surface has a shape extending along the parallel direction with respect to the rotating shaft, the blowing device. According to claim 3,
The blower device of which the internal angle at the said upstream end of the said boss part is 50 degrees or more. The method according to any one of claims 1 to 4,
If the height dimension in the parallel direction with respect to the rotation axis of the upstream surface is H, and the height dimension in the parallel direction with respect to the rotation axis of the downstream surface is h, h / (H + h ) Value is 1/5 or more, blower. According to claim 1,
The upstream surface has a shape of a conical surface that expands in diameter as it faces the downstream side,
The downstream surface has a shape of a conical surface that shrinks in diameter as it faces the downstream side. The method according to any one of claims 1 to 4,
The outer surface of the boss portion is formed to be curved toward the downstream surface from the upstream surface. The method according to any one of claims 1 to 4,
The outer surface of the boss portion is formed to be bent from the upstream surface toward the downstream surface. The method according to any one of claims 1 to 4,
In the parallel direction with respect to the rotation axis, a height dimension between the position of the most downstream side in the wing portion and the root position of the leading edge portion is called a, and the position of the most downstream side in the wing portion is If the height dimension between the position of the blade tip and b is b, the value of hb / ha is 1.5 or more. The method according to any one of claims 1 to 4,
The air passage forming member,
The inner wall part,
Has a concave portion formed to be concave from the inner wall portion,
In the direction parallel to the axis of rotation, the most downstream side of the recess is located at the upstream side than the most downstream side of the boss portion, and further downstream of the wing tip of the wing portion. And
In the direction parallel to the rotation axis, the most upstream portion of the concave portion is located on the upstream side of the blade tip than the blade tip portion. The method according to any one of claims 1 to 4,
The air passage forming member,
A first inner wall portion,
Located on the downstream side than the first inner wall portion, and has a second inner wall portion having a narrower passage area than the first inner wall portion,
In the direction parallel to the rotation axis, the most upstream portion of the second inner wall portion is located on the upstream side of the most downstream portion of the boss portion, and further downstream of the wing tip portion of the wing portion. Located in, blower. The method according to any one of claims 1 to 4,
The said outer periphery part has a shape extended toward the inside from the outer side in the said rotational radial direction as it faces the said blade tip part. The method of claim 12,
When the propeller fan is rotating, a portion of the wing portion near the tip of the blade is elastically deformed by the action of centrifugal force, and a portion near the tip of the blade of the outer periphery is rotated to substantially follow the circumferential direction. Blower. The method according to any one of claims 1 to 4,
It is disposed on the downstream side than the propeller fan, and further comprising a rectifying blade having an upstream edge portion on the upstream side,
Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while viewing them in a direction perpendicular to the rotation axis in a state in which they are opposed to each other, the one of them toward the other side of the parallel to the rotation axis A shape in which gaps are formed between them when they are virtually moved along one direction and brought into contact with each other, and / or when they are viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other, only a part of them cross each other. A blower having a shape. The method of claim 14,
When viewed from the direction perpendicular to the axis of rotation,
A first virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,
A second virtual straight line is formed so as to connect the innermost part of the upstream rim of the rectifying blade in the rotational radial direction and the outermost part of the upstream rim of the rectifying blade in the rotating radial direction,
The angle formed by the first virtual straight line and the second virtual straight line is 10 ° or more and 80 ° or less. The method of claim 14,
When viewed from the parallel direction with respect to the axis of rotation,
A third virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,
A fourth virtual straight line is formed so as to connect the innermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction and the outermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction,
The angle formed by the third virtual straight line and the fourth virtual straight line is 10 ° or more and 90 ° or less. The method of claim 14,
Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while looking at them in the perpendicular direction with respect to the rotation axis in a state where they are opposed to each other, the one of them toward the other side of the A shape in which a gap is formed between them when virtually moving along a parallel direction and contacting each other, and a shape in which only a part of them intersect when viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other Having, blower. The method of claim 14,
If the number of wings is M, and the number of rectification wings is N,
Both M and N are prime numbers, and the blower apparatus has a relationship of 2M ± 1 = N or 2N ± 1 = M. The method of claim 14,
In the parallel direction with respect to the rotation axis, the narrowest gap formed between the blade portion and the rectifying blade is 3 mm or less. The method according to any one of claims 1 to 4,
In the parallel direction with respect to the rotation axis, the output shaft is located at the upstream side of the boss portion more than the downstream portion. A wind path forming member including an inlet and an outlet, and
A drive motor including an output shaft and installed inside the air passage forming member,
It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,
The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,
The wing portion,
A blade tip positioned at the tip of the propeller fan in the rotational direction;
A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;
A trailing edge portion extending from the outer surface of the boss portion toward the outside in the radial direction of rotation of the propeller fan, and forming a rear edge of the wing portion in the rotation direction;
An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,
In the direction parallel to the rotation axis, the height dimension between the most downstream position and the leading edge position in the blade section is called ha, and the most downstream position in the wing section is If the height dimension between the positions of the tip of the wing is hb, the value of hb / ha is 1.5 or more, and the blowing device. A wind path forming member including an inlet and an outlet, and
A drive motor including an output shaft and installed inside the air passage forming member,
It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,
The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,
The wing portion,
A blade tip positioned at the tip of the propeller fan in the rotational direction;
A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;
A trailing edge portion extending from the outer surface of the boss portion toward the outside in the radial direction of rotation of the propeller fan, and forming a rear edge of the wing portion in the rotation direction;
An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,
The air passage forming member,
The inner wall part,
Has a concave portion formed to be concave from the inner wall portion,
In the direction parallel to the rotational axis, the most downstream side of the recess is located on the upstream side of the boss portion most downstream, and further on the downstream side of the wing portion of the wing tip. ,
In the direction parallel to the rotation axis, the most upstream portion of the concave portion is located on the upstream side of the blade tip than the blade tip portion. A wind path forming member including an inlet and an outlet, and
A drive motor including an output shaft and installed inside the air passage forming member,
It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,
The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,
The wing portion,
A blade tip positioned at the tip of the propeller fan in the rotational direction;
A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;
A trailing edge portion extending from the outer surface of the boss portion toward the outside in the radial direction of rotation of the propeller fan, and forming a rear edge of the wing portion in the rotation direction;
An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,
The air passage forming member,
A first inner wall portion,
Located on the downstream side than the first inner wall portion, and has a second inner wall portion having a narrower passage area than the first inner wall portion,
In the direction parallel to the rotation axis, the most upstream portion of the second inner wall portion is located on the upstream side of the most downstream portion of the boss portion, and further on the downstream side of the wing tip portion of the wing portion. Located, blower. The method according to any one of claims 21 to 23,
The said outer periphery part has a shape extended toward the inside from the outer side in the said rotational radial direction as it faces the said blade tip part. The method of claim 24,
When the propeller fan is rotating, a portion of the wing portion near the tip of the blade is elastically deformed by the action of centrifugal force, and a portion near the tip of the blade of the outer periphery is rotated to substantially follow the circumferential direction. Blower. The method according to any one of claims 21 to 23,
The outer surface of the boss portion,
An upstream end most located on the upstream side,
An upstream surface which is continuous to the upstream end and extends toward the outside in the radial direction of the propeller fan as it faces the downstream side,
A downstream portion located on the downstream side of the downstream end of the upstream surface,
And a downstream surface connecting the downstream end of the upstream surface and the downstream portion,
The downstream surface has a shape that extends along the parallel direction with respect to the rotation axis, or a shape that extends toward the inside of the rotational radial direction rather than the parallel direction toward the downstream portion. The method according to any one of claims 21 to 23,
The outer surface of the boss portion,
The upper end which is located at the most upstream side and has a planar shape,
It is continuous to the outer rim of the upstream end and extends along the parallel direction with respect to the axis of rotation, or extends toward the inside of the rotational radial direction of the propeller fan than toward the parallel direction toward the downstream side. An upstream surface having a shape of
A downstream portion located on the downstream side of the downstream end of the upstream surface,
And a downstream surface connecting the downstream end of the upstream surface and the downstream portion,
The downstream surface has a shape extending toward the inner side of the radial direction of rotation rather than the parallel direction toward the downstream portion. The method of claim 26,
The upstream surface has a shape of a conical surface that expands in diameter as it faces the downstream side,
The downstream surface has a shape extending along the parallel direction with respect to the rotating shaft, the blowing device. The method of claim 28,
The blower device of which the internal angle at the said upstream end of the said boss part is 50 degrees or more. The method of claim 26,
If the height dimension in the parallel direction with respect to the rotation axis of the upstream surface is H, and the height dimension in the parallel direction with respect to the rotation axis of the downstream surface is h, h / (H + h ) Value is 1/5 or more, blower. The method of claim 26,
The upstream surface has a shape of a conical surface that expands in diameter as it faces the downstream side,
The downstream surface has a shape of a conical surface that shrinks in diameter as it faces the downstream side. The method of claim 26,
The outer surface of the boss portion is formed to be curved toward the downstream surface from the upstream surface. The method of claim 26,
The outer surface of the boss portion is formed to be bent from the upstream surface toward the downstream surface. The method of claim 26,
It is disposed on the downstream side than the propeller fan, and further comprising a rectifying blade having an upstream edge portion on the upstream side,
Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while viewing them in a direction perpendicular to the rotation axis in a state in which they are opposed to each other, the one of them toward the other side of the parallel to the rotation axis A shape in which gaps are formed between them when they are virtually moved along one direction and brought into contact with each other, and / or when they are viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other, only a part of them cross each other. A blower having a shape. The method of claim 34,
When viewed from the direction perpendicular to the axis of rotation,
A first virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,
A second virtual straight line is formed so as to connect the innermost part of the upstream rim of the rectifying blade in the rotational radial direction and the outermost part of the upstream rim of the rectifying blade in the rotating radial direction,
The angle formed by the first virtual straight line and the second virtual straight line is 10 ° or more and 80 ° or less. The method of claim 34,
When viewed from the parallel direction with respect to the axis of rotation,
A third virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,
A fourth virtual straight line is formed so as to connect the innermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction and the outermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction,
The angle formed by the third virtual straight line and the fourth virtual straight line is 10 ° or more and 90 ° or less. The method of claim 34,
Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while looking at them in the perpendicular direction with respect to the rotation axis in a state where they are opposed to each other, the one of them toward the other side of the A shape in which a gap is formed between them when virtually moving along a parallel direction and contacting each other, and a shape in which only a part of them intersect when viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other Having, blower. The method of claim 34,
If the number of wings is M, and the number of rectification wings is N,
Both M and N are prime numbers, and the blower apparatus has a relationship of 2M ± 1 = N or 2N ± 1 = M. The method of claim 34,
In the parallel direction with respect to the rotation axis, the narrowest gap formed between the blade portion and the rectifying blade is 3 mm or less. The method according to any one of claims 21 to 23,
In the parallel direction with respect to the rotation axis, the output shaft is located at the upstream side of the boss portion more than the downstream portion. A wind path forming member including an inlet and an outlet, and
A drive motor including an output shaft and installed inside the air passage forming member,
It includes a boss portion attached to the output shaft and a wing portion provided on the outer surface of the boss portion, and has a propeller fan disposed on the inlet side than the drive motor,
The propeller fan receives the rotational power from the drive motor and rotates around an imaginary axis of rotation to generate an airflow flowing from the intake port on the upstream side toward the discharge port on the downstream side,
It is disposed on the downstream side than the propeller fan, and further comprising a rectifying blade having an upstream edge portion on the upstream side,
The wing portion,
A blade tip positioned at the tip of the propeller fan in the rotational direction;
A leading edge portion extending from the tip end portion of the blade to the outer surface of the boss portion and forming a front edge of the blade portion in the rotation direction;
A trailing edge portion extending from the outer surface of the boss portion toward the outside in the radial direction of rotation of the propeller fan, and forming a rear edge of the wing portion in the rotation direction;
An outer circumferential portion which connects the front end portion of the wing portion and the outer end portion of the trailing edge portion, and forms an outer circumferential edge of the wing portion in the rotational radial direction,
Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade is parallel to the rotation axis toward one of them while looking at them in a direction perpendicular to the rotation axis in a state where they face each other. A shape in which gaps are formed between them when they are virtually moved along a direction to contact each other, and / or a shape where only a part of them intersect when they are viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other Having a blower. The method of claim 41,
When viewed from the direction perpendicular to the axis of rotation,
A first virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,
A second virtual straight line is formed so as to connect the innermost part of the upstream rim of the rectifying blade in the rotational radial direction and the outermost part of the upstream rim of the rectifying blade in the rotating radial direction,
The angle formed by the first virtual straight line and the second virtual straight line is 10 ° or more and 80 ° or less. The method of claim 41 or 42,
When viewed from the parallel direction with respect to the axis of rotation,
A third virtual straight line is formed so as to connect the innermost portion of the trailing edge portion of the wing portion in the rotational radius direction and the outermost portion of the trailing portion of the wing portion in the rotational radius direction,
A fourth virtual straight line is formed so as to connect the innermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction and the outermost portion of the upstream rim portion of the rectifying blade in the rotation radius direction,
The angle formed by the third virtual straight line and the fourth virtual straight line is 10 ° or more and 90 ° or less. The method of claim 41 or 42,
Each of the trailing edge portion of the wing portion and the upstream edge portion of the rectifying blade, while looking at them in the perpendicular direction with respect to the rotation axis in a state where they are opposed to each other, the one of them toward the other side of the A shape in which a gap is formed between them when virtually moving along a parallel direction and contacting each other, and a shape in which only a part of them intersect when viewed in the parallel direction with respect to the rotation axis in a state where they are opposed to each other Having, blower. The method of claim 41 or 42,
If the number of wings is M, and the number of rectification wings is N,
Both M and N are prime numbers, and the blower apparatus has a relationship of 2M ± 1 = N or 2N ± 1 = M. The method of claim 41 or 42,
In the parallel direction with respect to the rotation axis, the narrowest gap formed between the blade portion and the rectifying blade is 3 mm or less. The method of claim 41 or 42,
In the parallel direction with respect to the rotation axis, the output shaft is located at the upstream side of the boss portion more than the downstream portion. The method of claim 41 or 42,
In the parallel direction with respect to the rotational axis, the height dimension between the position of the most downstream side in the wing portion and the root position of the leading edge portion is called ha, and the position of the most downstream side in the wing portion If the height dimension between the position of the tip of the blade and hb is hb, the value of hb / ha is 1.5 or more. The method of claim 41 or 42,
The air passage forming member,
The inner wall part,
Has a concave portion formed to be concave from the inner wall portion,
In the direction parallel to the axis of rotation, the most downstream side of the recess is located at the upstream side than the most downstream side of the boss portion, and further downstream of the wing tip of the wing portion. And
In the direction parallel to the rotation axis, the most upstream portion of the concave portion is located on the upstream side of the blade tip than the blade tip portion. The method of claim 41 or 42,
The air passage forming member,
A first inner wall portion,
Located on the downstream side than the first inner wall portion, and has a second inner wall portion having a narrower passage area than the first inner wall portion,
In the direction parallel to the rotation axis, the most upstream portion of the second inner wall portion is located on the upstream side of the most downstream portion of the boss portion, and further downstream of the wing tip portion of the wing portion. Located in, blower. The method of claim 48,
The said outer periphery part has a shape extended toward the inside from the outer side in the said rotational radial direction as it faces the said blade tip part. The method of claim 51,
When the propeller fan is rotating, a portion of the wing portion near the tip of the blade is elastically deformed by the action of centrifugal force, and a portion near the tip of the blade of the outer periphery is rotated to substantially follow the circumferential direction. Blower. The method of claim 41 or 42,
The outer surface of the boss portion,
An upstream end most located on the upstream side,
An upstream surface which is continuous to the upstream end and extends toward the outside in the radial direction of the propeller fan as it faces the downstream side,
A downstream portion located on the downstream side of the downstream end of the upstream surface,
And a downstream surface connecting the downstream end of the upstream surface and the downstream portion,
The downstream surface has a shape that extends along the parallel direction with respect to the rotation axis, or a shape that extends toward the inside of the rotational radial direction rather than the parallel direction toward the downstream portion. The method of claim 41 or 42,
The outer surface of the boss portion,
The upper end which is located at the most upstream side and has a planar shape,
It is continuous to the outer rim of the upstream end and extends along the parallel direction with respect to the axis of rotation, or extends toward the inside of the rotational radial direction of the propeller fan than toward the parallel direction toward the downstream side. An upstream surface having a shape of
A downstream portion located on the downstream side of the downstream end of the upstream surface,
And a downstream surface connecting the downstream end of the upstream surface and the downstream portion,
The downstream surface has a shape extending toward the inner side of the radial direction of rotation rather than the parallel direction toward the downstream portion. The method of claim 53,
The upstream surface has a shape of a conical surface that expands in diameter as it faces the downstream side,
The downstream surface has a shape extending along the parallel direction with respect to the rotating shaft, the blowing device. The method of claim 55,
The blower device of which the internal angle at the said upstream end of the said boss part is 50 degrees or more. The method of claim 53,
If the height dimension in the parallel direction with respect to the rotation axis of the upstream surface is H, and the height dimension in the parallel direction with respect to the rotation axis of the downstream surface is h, h / (H + h ) Value is 1/5 or more, blower. The method of claim 53,
The upstream surface has a shape of a conical surface that expands in diameter as it faces the downstream side,
The downstream surface has a shape of a conical surface that shrinks in diameter as it faces the downstream side. The method of claim 53,
The outer surface of the boss portion is formed to be curved toward the downstream surface from the upstream surface. The method of claim 53,
The outer surface of the boss portion is formed to be bent from the upstream surface toward the downstream surface.

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