WO2012098652A1

WO2012098652A1 - Air blower and outdoor unit for air conditioner equipped with same

Info

Publication number: WO2012098652A1
Application number: PCT/JP2011/050844
Authority: WO
Inventors: 岸谷　哲志; 岩瀬　拓; 裕太橋本; 八木　浩作
Original assignee: 日立アプライアンス株式会社
Priority date: 2011-01-19
Filing date: 2011-01-19
Publication date: 2012-07-26
Also published as: JPWO2012098652A1; JP5752714B2

Abstract

Provided is an air blower which provides a design that does not cause the user concern, and with which the fan performance can be improved; also provided is an outdoor unit for an air conditioner equipped with this air blower. When seen from the direction of the rotational axis of a propeller fan (109), the gap (112) between the blade outer circumference (109d) of the propeller fan (109) and a discharge-side cylindrical part (110c) is formed larger than the gap (111) between the blade outer circumference (109d) and an intake-side cylindrical part (110b), and the intake-side cylindrical part (110b) is formed longer in the axial direction (G) than the discharge-side cylindrical part (110c). Furthermore, the radial deformation of the blades (109a) during rotation as well as manufacturing error, assembly error, and deformation due to changes over time are taken into consideration and the size of the gap (111) is set such that even when there is a disturbance during rotation of the propeller fan (109) the blade outer circumference (109d) and the intake-side cylindrical part (110b) do not make contact, and such that the gap (112) is greater than the gap (111) by at least 1.1 times.

Description

Blower and air conditioner outdoor unit equipped with the same

The present invention relates to a blower and an outdoor unit of an air conditioner equipped with the blower.

Patent Document 1 describes a blower device in which a suction side arc portion is formed on the suction side of a bell mouth provided on the outer side in the radial direction of the propeller fan, and a blow side arc portion is formed on the blow side. As a result, the growth of leakage flow in the gap between the outer periphery of the blade of the propeller fan and the bell mouth can be suppressed, and noise when the blade tip vortex collides with the fan guard can be reduced.

Japanese Patent No. 4140236

By the way, in recent years, for the purpose of energy saving, improvement in pressure performance, improvement in fan efficiency (work rate), and noise reduction for improvement in comfort of the propeller fan constituting the air blower have been raised as issues. It is known that all issues are closely related, and if there is a fan that aims to improve performance, solving any one of the issues will not only give good results to other issues. . Under such circumstances, as a noise reduction means, in addition to the technique described in Patent Document 1, it is generally known to reduce the leakage flow by reducing the gap between the propeller fan and the bell mouth as much as possible. ing. However, when the propeller fan is made of resin, the blades of the propeller fan are deformed by centrifugal force during rotation, so that there is a limit that the gap between the propeller fan and the bell mouth can be reduced. Conventionally, the minimum clearance between the propeller fan and the bell mouth has been determined in consideration of the radial component of the deformation and the secular change so that the propeller fan and the bell mouth do not contact during rotation. In addition, as a duct type in which the length of the bell mouth that overlaps (wraps) the propeller fan in the axial direction is increased, a means for improving the blowing performance is also generally known.

However, in the technique described in Patent Document 1, although the effect as a duct-type bell mouth can be expected, the gap between the propeller fan and the bell mouth is about the gap between the propeller fan 109 and the bell mouth 500 as shown in FIG. Since the maximum value (the trailing edge side blade outer periphery 109g) of the radial deformation (see reference numeral 113) of the blade 109a in the lap range (the position of the cylindrical portion 501) in the axial direction G is determined in consideration, further improvement of the blowing performance can be expected. There was no problem.

Further, in a propeller fan in which the leading edge of a general wing has a sickle shape, as shown in FIG. 9, the position (109g) on the trailing edge side of the wing outer periphery 109d is within the lap range of the propeller fan 109 and the bell mouth 500. The radial deformation at is larger than the radial deformation of the bell mouth suction side (109f) blade 109a. Therefore, since the gap between the propeller fan and the bell mouth is determined based on the outer peripheral position of the blade on the trailing edge side, when it is desired to further reduce the gap between the propeller fan 109 and the bell mouth 500, the blade that reduces the deformation of the propeller fan. Therefore, there is a problem that it is necessary to select a material thickness and material, which leads to cost increase. However, even if such a selection can be made, the gap between the propeller fan and the bell mouth looks small, and there is a problem that the propeller fan and the bell mouth are in contact with each other while the fan is rotating. .

The present invention solves the above-mentioned conventional problems, and can provide a design that does not make the user feel uneasy, and that can improve fan performance and an outdoor unit of an air conditioner equipped with the blower. The issue is to provide.

The present invention provides a blower device including a resin-made propeller fan, a fan motor that rotates the propeller fan, and a cylindrical bell mouth that surrounds the propeller fan, as viewed from the rotation axis direction of the propeller fan. The gap between the outer periphery of the blade of the propeller fan and the suction side cylindrical portion of the bell mouth is larger than the gap between the outer periphery of the blade and the outlet side cylindrical portion of the bell mouth, and The suction-side cylindrical portion is formed to have a long axial length, and the clearance between the suction-side cylindrical portion and the blade outer periphery is deformed in the radial direction due to the rotation of the blade facing the suction-side cylindrical portion, manufacturing error, and assembly. In consideration of all errors and deformation due to secular change, even if there is a disturbance during the rotation of the propeller fan, the blade outer periphery and the suction side cylindrical part are set to a value that does not contact, The gap between the blowout side cylindrical portion and the outer periphery of the blade is determined by taking into account all of radial deformation due to rotation of the blade facing the blowout side cylindrical portion, manufacturing error, assembly error, and deformation due to secular change. Even if there is a disturbance during the rotation of the fan, it is characterized by being 1.1 times or more of the value at which the outer periphery of the blade does not contact the blowout side cylindrical portion.

According to the present invention, a design that does not make the user feel uneasy can be provided, and the fan performance can be improved.

It is a front view which shows the air blower which concerns on 1st Embodiment. It is a perspective view which shows the air blower which concerns on 1st Embodiment. It is the P section enlarged view of FIG. It is QQ sectional drawing of FIG. It is sectional drawing which shows the air blower which concerns on 2nd Embodiment. It is sectional drawing which shows the air blower which concerns on 3rd Embodiment. It is a front view which shows the outdoor unit of the air conditioner which mounts the air blower which concerns on this embodiment. It is the schematic when the inside of the outdoor unit of FIG. 7 is seen from the upper part. It is sectional drawing which shows the conventional air blower. It is explanatory drawing which shows the problem in the outdoor unit of the air conditioner which mounts the conventional air blower.

Hereinafter, the

blower devices

101A, 101B, and 101C of the present embodiment and the outdoor unit 401 of the air conditioner including the same will be described with reference to FIGS. 4 to 6 show the positional relationship between the rotating propeller fan 109 and the

bell mouths

110, 200, and 300, and FIG. 8 shows the propeller fan 109 in a simplified manner. In the embodiment shown below, the diameter of the propeller fan 109 is about 450 to 650 mm, the upper limit value of the rotation speed of the propeller fan 109 is about 1200 rpm, and the thickness of the blade 109a is about It is 1 to 3 mm, and it is assumed that the deformation in the radial direction of the outer periphery 109 g of the trailing edge side blade at 1200 rpm is about 2 to 3 mm.

(First embodiment)
As shown in FIG. 1, the blower 101 A according to the first embodiment includes a fan motor 104 (see FIG. 2), a propeller fan 109, and a bell mouth 110.

The fan motor 104 serves as a drive source for rotationally driving the propeller fan 109, and is fixed to an outdoor unit 401 (see FIG. 8) to be described later via a motor clamp 103.

The propeller fan 109 has a hub 109s connected to a motor shaft (not shown) formed on the fan motor 104, and blades (fan blades) 109a, 109a, 109a formed on the outer peripheral surface of the hub 109s. is doing. The wings 109a are not limited to three but may be two or more than three.

A shaft hole (not shown) to which a motor shaft (not shown) is connected and fixed is formed in the hub 109s of the propeller fan 109. The propeller fan 109 is made of resin such as AS resin (acrylonitrile-styrene copolymer) containing glass fiber, PP resin (polypropylene) containing glass fiber, and is integrally formed by injection molding or the like.

In addition, the propeller fan 109 is rotated counterclockwise as indicated by a symbol W in FIG. 1, and the surface on the front side of the blade 109a becomes a pressure surface, and the surface on the back side becomes a negative pressure surface, thereby generating an air flow. As a result, air flows from the leading edge side 109b of the wing 109a toward the trailing edge side 109c.

2, the wing 109a has a substantially sickle shape, and is formed so as to be obliquely connected to the peripheral surface of the hub 109s with respect to the axial direction G. In addition, the front edge side 109b of the wing 109a is configured to protrude larger in the axial direction with respect to the hub 109s than the rear edge side 109c.

The bell mouth 110 is formed in a cylindrical shape so as to cover the outer periphery in the radial direction of the propeller fan 109, and is formed integrally with the plate-like bell mouth mounting plate 102 located in the front (front side) by press-molding a sheet metal. Has been. In FIG. 2, the front edge side 109b (the back side in the figure) is the air suction side, and the rear edge side 109c (the front side in the figure) is the air blowing side.

Further, the bell mouth 110 has a suction side cylindrical portion 110b and a blowout side cylindrical portion 110c, and is formed with diameters of φA and φB (φB> φA), respectively. The suction side cylindrical part 110 b and the blowout side cylindrical part 110 c are each formed concentrically with respect to the rotation center O of the propeller fan 109.

As shown in FIG. 3, in the blower 101 _A , a gap 111 indicated by a gap GA is formed between the blade outer periphery 109 d of the propeller fan 109 and the suction side cylindrical portion 110 b of the bell mouth 110. Further, blower 101A is a gap 112 shown in the gap _{G B} between the outlet side cylindrical portion 110c of the blade outer peripheral 109d bell mouth 110 of the propeller fan 109 is formed. Thus, the air blower 101A is formed so that the gap 112 (gap G _B ) is wider than the gap 111 (gap G _A ).

FIG. 4 shows the bell mouth 110 in a QQ cross section and schematically shows the wing 109a so that the positional relationship between the bell mouth 110 and the wing outer periphery 109d becomes clear. As shown in FIG. 4, the suction-side cylindrical portion 110b of the bell mouth 110 is formed to have a length L _A in the axial direction G. Further, the blowing side cylindrical portion 110c of the bell mouth 110 is formed to have a length L _B in the axial direction G. The length L _A and the length L _B are set so that L _A > L _B. Further, the blow-side end portion of the blow-out side cylindrical portion 110c is substantially (approximately) positioned on the radial extension of the trailing edge-side blade outer periphery 109g of the blade 109a as indicated by a circle in FIG.

The bell mouth 110 has a suction R (suction curved surface) 110a formed on the suction side of the suction side cylindrical portion 110b. The suction R110a is formed so as to increase in diameter with increasing distance from the suction-side cylindrical portion 110b with respect to the axial direction G.

Further, as shown by a circle in FIG. 4, the end portion on the suction side of the bell mouth 110 is an axial center blade outer periphery 109f that is substantially intermediate between the leading edge side blade outer periphery 109e and the trailing edge side blade outer periphery 109g of the blade outer periphery 109d. positioned. The leading edge side blade outer periphery 109e is a portion located on the outermost peripheral side of the leading edge side 109b of the blade 109a, as indicated by a circle in FIG.

Further, the bell mouth 110 has a tapered portion 110d formed at the boundary between the suction side cylindrical portion 110b and the blowout side cylindrical portion 110c. The tapered portion 110d is formed so that the diameter of the bell mouth 110 gradually increases from the suction side to the blowout side.

In the present embodiment, the bell mouth 110 is described by taking as an example a configuration in which the tapered portion 110d is provided. However, the configuration is not limited to such a shape, and the tapered portion 110d is not provided. May be. That is, the suction side cylindrical portion 110b and the blowout side cylindrical portion 110c may be connected to each other through a stepped portion. However, even in the case where the tapered portion 110d is not provided, the suction side cylindrical portion 110b and the blowout side cylindrical portion 110c so that the length L _A > the length L _B , as in the embodiment provided with the tapered portion 110d. Set the length of.

Further, a blowing part 110e larger than the diameter of the blowing side cylindrical part 110c is formed on the blowing side from the blowing side cylindrical part 110c. The blowing part 110e is formed in an L-shaped cross section, the suction side is formed integrally with the blowing side of the blowing side cylindrical part 110c, and the blowing side is formed integrally with the bell mouth mounting plate 102.

By the way, in the air blower 101A, when the propeller fan 109 rotates, a centrifugal force determined by the mass and rotation speed of the blade 109a is generated, and stress is generated at a portion supporting the blade 109a, that is, a boundary portion between the blade 109a and the hub 109s. To do. The blade 109a is attached to the outer peripheral surface of the hub 109s obliquely with respect to the axial direction (see FIG. 2). During rotation, a force is generated that deforms the front edge side 109b and the rear edge side 109c in a horizontal direction. Further, since the front edge side 109b of the wing 109a protrudes more in the axial direction than the rear edge side 109c with respect to the hub 109s, the deformation of the front edge side 109b of the wing 109a is deformed as shown by a two-dot chain line 113 in FIG. , Larger than the deformation of the trailing edge 109c of the wing 109a. Note that the axial center blade outer periphery 109f of the blade 109a is a position that overlaps with the boundary between the blade 109a and the hub 109s in the radial direction and is close to the center of gravity of the blade 109a, so that deformation is minimized.

_A gap 111 (gap G _A ) between the suction-side cylindrical portion 110b and the blade outer periphery 109d includes a deformation F1, a manufacturing error F2, an assembly error F3, and a deformation F4 due to the secular change of the blade 109a facing the suction-side cylindrical portion 110b. In consideration of all of the above, even if there is a disturbance F5 during the rotation of the propeller fan 109, the blade outer periphery 109d is set to a value (distance) at which the suction side cylindrical portion 110b does not contact.

The deformation F1 due to rotation refers to deformation generated by centrifugal force generated by the rotation of the propeller fan 109 in the W direction (see FIG. 1). The centrifugal force is determined by mass m × radius r × rotational speed ω ² .

Manufacturing error F2 refers to an error that occurs when molding is performed using a mold, for example. Note that the manufacturing error F2 includes not only an error that occurs when a mold is used, but also an error that occurs when a method that does not use a mold, for example, cutting and manufacturing.

The assembly error F3 is an error that occurs when the propeller fan 109 is attached to the fan motor 104, an error that occurs when the fan motor 104 is attached to the motor clamp 103, and the motor clamp 103 is installed in the unit (an outdoor unit 401 described later). Including errors in

The deformation F4 due to secular change includes, for example, deformation due to temperature change as well as deformation due to resin deterioration. For example, in the case of Japan, there are four seasons, and the wing 109a is deformed during rotation by being repeatedly used between summer and winter or by being used for a long time (reference numeral 113 in FIG. 4). It has the property of approaching. For example, after five years, the initial shape of the wing 109a is not maintained, and it becomes an extended shape.

The disturbance F5 means a gap for preventing the propeller fan 109 from contacting the bell mouth 110 even if the wing 109a is missing during the rotation of the propeller fan 109. That is, even if the blades 109a are missing during the rotation of the propeller fan 109, the propeller fan 109 continues to rotate. At this time, the motor clamp 103 supporting the fan motor 104 also vibrates. 110 may come into contact. The gap is determined in consideration of such disturbance F5. The disturbance F5 includes not only the case described above but also a case where an impact (within the range of common sense) is given by the user to the outdoor unit 401 as described later.

Thus, the necessary minimum gap 111 between the suction side cylindrical portion 110b and the blade outer periphery 109d is determined based on an expression represented by (F1 + F2 + F3 + F4 + F5 + G1). Note that G1 in the above formula is a gap necessary for the case where (F1 + F2 + F3 + F4 + F5) is considered that the wing 109a and the bell mouth 110 are in contact with each other and the bell mouth 110 and the wing 109a are not in contact with each other.

On the other hand, the gap 112 (gap G _B ) between the blowout-side cylindrical portion 110c and the blade outer periphery 109d is caused by the deformation F1, the manufacturing error F2, the assembly error F3, and the secular change due to the rotation of the blade 109a facing the blowout-side cylindrical portion 110c. In consideration of all deformations F4, even if there is a disturbance F5 during the rotation of the propeller fan 109, it is set to 1.1 times or more of the value (distance) at which the blade outer periphery 109d does not contact the suction side cylindrical portion 110b. Note that F1, F2, F3, F4, F5, and G1 are set based on the same conditions as in the case of the gap 111 described above.

Thus, the necessary minimum gap 112 between the blowout side cylindrical portion 110c and the blade outer periphery 109d is determined based on an expression expressed by (F1 + F2 + F3 + F4 + F5 + G1) × 1.1 or more. In addition, “1.1 (times) or more” shown in the above expression is solved that the user feels uneasy that the propeller fan 109 is in contact with the bell mouth 110 while the propeller fan 109 is rotating. It is a value (multiple) necessary to do.

That is, when the user looks at the blower 101A from the axial direction, the blowout side cylindrical part 110c is positioned on the near side of the suction side cylindrical part 110b, so that the blower side cylindrical part 110c and the propeller fan 109 are The gap 112 is the closest position. For this reason, the user's impression of how far the bell mouth 110 is from the propeller fan 109 depends on the gap 112. Therefore, while the gap 111 between the suction side cylindrical portion 110b and the blade outer periphery 109d is set to (F1 + F2 + F3 + F4 + F5 + G1), the clearance 112 between the blowout side cylindrical portion 110c and the blade outer periphery 109d is for giving a sense of security. (F1 + F2 + F3 + F4 + F5 + G1) × 1.1 or more is formed so that the gap 112 on the blowing side is wider than the gap 111 on the suction side. In other words, the gap 112 is 1.1 times the gap 111 or more. Even if the gap 112 of the blow-out side cylindrical part 110c is 1.1 times or more than the gap 111 of the suction-side cylindrical part 110b, the gap 111 of the suction-side cylindrical part 110b can be formed narrower than before. It becomes, because it is longer than the further the length L _B of the length L _a of the suction-side cylindrical part 110b are outlet side cylindrical portion 110c, it is possible to achieve an improvement of the fan performance than conventional. In addition, the upper limit value of the multiple to be multiplied by (F1 + F2 + F3 + F4 + F5 + G1) for the gap 112 between the blowout-side cylindrical portion 110c and the blade outer periphery 109d can be set as appropriate within a range in which improvement in fan performance can be achieved.

As described above, the air blower 101A according to the first embodiment includes the blade outer periphery 109d of the propeller fan 109 and the suction side cylindrical portion 110b of the bell mouth 110 when viewed from the rotation axis direction (axial direction G) of the propeller fan 109. The gap 112 between the blade outer periphery 109d and the blowout cylindrical portion 110c of the bell mouth 110 is formed larger than the gap 111. Thus, by providing the suction side cylindrical portion 110b at a position facing the portion where the radial deformation (see reference numeral 113 in FIG. 4) of the blade 109a of the propeller fan 109 is small, the suction side cylindrical portion 110b and the propeller fan 109 This gap 111 can be made smaller than the gap 115 (gap G _C , see FIG. 9) conventionally determined by the outer periphery 109g of the trailing edge side wing.

Moreover, since the air blower 101A according to the first embodiment is configured such that the suction side cylindrical portion 110b having a small gap 111 is longer in the axial direction than the blowout side cylindrical portion 110c, the effect of the duct type bell mouth 110 is achieved. It is possible to improve the air blowing performance.

Further, in the blower 101A according to the first embodiment, the gap 111 between the suction side cylindrical portion 110b and the blade outer periphery 109d is deformed F1, production error F2, and assembly error due to the rotation of the blade 109a facing the suction side cylindrical portion 110b. In consideration of all of F3 and deformation F4 due to secular change, even if there is a disturbance F5 during the rotation of the propeller fan 109, the blade outer periphery 109d and the suction side cylindrical portion 110b are set to a value that does not contact, and the blowout side cylinder The gap between the portion 110c and the blade outer periphery 109d takes into account all of the deformation F1, the manufacturing error F2, the assembly error F3, and the deformation F4 due to secular change of the blade facing the blowout cylindrical portion, and the propeller fan. Even if there is a disturbance F5 during the rotation of 109, the blade outer periphery 109d and the blowout side cylindrical portion 110c are set to be 1.1 times or more than the value at which they do not contact. One in which the. Thus, since the gap 112 of the blow-out side cylindrical portion 110c is formed to be larger than the gap 111 of the suction-side cylindrical portion 110b, the user can move the propeller fan 109 and the bell mouth 110 during the rotation of the propeller fan 109. You can eliminate feelings of anxiety about contact.

Thus, according to 1st Embodiment, the design which does not make a user feel uneasy can be provided. In addition, according to the first embodiment, the suction-side gap 111 (gap G _A ) is formed even if the blowing-side gap 112 (gap G _B ) is formed wider than before so as not to make the user feel uneasy. Since the length L _A of the suction side cylindrical portion 110b is longer than the length L _B of the blowout side cylindrical portion 110c, the fan performance can be improved.

(Second Embodiment)
FIG. 5 is a cross-sectional view showing a blower according to the second embodiment. The blower 101B according to the second embodiment has a configuration in which a bell mouth 200 is used instead of the bell mouth 110 of the blower 101A according to the first embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

As shown in FIG. 5, the bell mouth 200 gradually increases the diameter (diameter φB of the bell mouth 110) of the blowout side cylindrical portion 110c of the first embodiment from the suction side to the blowout side of the blowout side cylindrical portion 110c. The blowout side round cylindrical portion 201c is used. The round shape R1 facing the blade outer periphery 109d of the blow-off round cylindrical portion 201c is desirably formed so as to follow the radial deformation of the blade 109a of the propeller fan 109 indicated by a two-dot chain line 113 in FIG.

In the bell mouth 200, the suction side cylindrical portion 201b is formed on the suction side of the blowout side round cylindrical portion 201c as in the first embodiment, and the suction R201a is formed on the suction side of the suction side cylindrical portion 201b. . In addition, on the blowout side of the bell mouth 200, a blowout R201e having a diameter increasing (the diameter from the center O of the propeller fan 109 is enlarged) from the blowout side of the blowout round cylindrical portion 201c to the bellmouth mounting plate 102 is formed. .

Further, when the length in the axial direction G of the suction side cylindrical portion 201b is L _A and the length in the axial direction G of the blowout side round cylindrical portion 201c is L _B , L _A > L _B is formed. Yes. In addition, the reference | standard of the blowing side of the blowing side round cylindrical part 201c is set to the position which substantially overlaps with the trailing edge side blade | wing outer periphery 109g of the wing | blade 109a in radial direction. In the second embodiment, the tapered portion 201d is formed between the suction side cylindrical portion 201b and the blowout side round cylindrical portion 201c. However, as described in the first embodiment, the tapered portion 201d is not provided. There may be.

Further, a gap 112 (gap G _B ) between the blowing-side round cylindrical portion 201c and the propeller fan 109 (blade outer periphery 109d) is opposite to the bell mouth 200 and the propeller facing each other at the position S1 on the most blowing side of the blade outer periphery 109d of the propeller fan 109. It is set with the fan 109. Here, the position of “opposing bell mouth 200” is a position S1 on the radial extension of the trailing edge side blade outer periphery 109g of the blade 109a. That is, the gap 112 is disturbed during the rotation of the propeller fan 109 in consideration of all of the radial deformation F1 due to the rotation of the blade 109a at the position S1, the manufacturing error F2, the assembly error F3, and the deformation F4 due to secular change. Even if there is F5, it is set to 1.1 times or more of the value at which the blade outer periphery 109d and the blowout side round cylindrical portion 201c do not contact.

According to the air blower 101B according to the second embodiment, the suction side cylindrical portion 201b is provided at a position facing a portion where the radial deformation (see reference numeral 113 in FIG. 5) of the blade 109a of the propeller fan 109 is small, thereby The gap 111 between the side cylindrical portion 201b and the propeller fan 109 can be made smaller than before. Further, according to the blower 101B, the length _{L A} of the small suction-side cylindrical portion 201b of the gap 111, since it is configured to be longer in the axial direction than the outlet side round cylindrical portion 201c, the duct type bellmouth 200 The improvement of the ventilation performance which is the effect of this can be aimed at. Furthermore, according to the blower 101B, the gap 112 of the blow-out side round cylindrical portion 201c is formed to be larger than the gap 111 of the suction-side cylindrical portion 201b, so that the user can rotate the propeller fan 109 while the propeller fan 109 is rotating. It is possible to eliminate the feeling of anxiety that the bell mouth 110 may come into contact. That is, according to the second embodiment, as in the first embodiment, it is possible to provide a design that does not make the user feel uneasy, and it is possible to improve fan performance.

(Third embodiment)
FIG. 6 is a cross-sectional view showing a blower according to the third embodiment. The blower 101C according to the third embodiment has a configuration in which a bell mouth 300 is used instead of the bell mouth 110 of the blower 101A according to the first embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

As shown in FIG. 6, the bell mouth 300 has a round cylinder in which the diameter (inner diameter) of the bell mouth 300 facing the wing outer periphery 109 d of the propeller fan 109 gradually increases from the suction side to the outlet side of the bell mouth 300. Part 301b. Further, a suction R301a is formed on the suction side of the round cylindrical portion 301b as in the first and second embodiments, and a round cylindrical portion is provided on the outlet side of the round cylindrical portion 301b as in the second embodiment. A blowout R301c is formed that expands from the blowout side of 301b to the bell mouth mounting plate 102 (the diameter from the center O of the propeller fan 109 increases).

Further, the gap 112 (gap G _B ) between the round cylindrical portion 301b and the propeller fan 109 (blade outer periphery 109d) is the bell mouth 300 and the propeller fan 109 that are opposed to each other at the position S2 on the most blowing side of the blade outer periphery 109d of the propeller fan 109. And set between. Here, the position of the “opposing bell mouth 300” is the position of the bell mouth 300 that wraps (overlaps) in the axial direction G with the blade outer periphery 109d from the leading edge side blade outer periphery 109e to the trailing edge side blade outer periphery 109g. It is position S2 on the most blowing side among the portions. That is, the gap 112 is disturbed during the rotation of the propeller fan 109 in consideration of all of the radial deformation F1, the manufacturing error F2, the assembly error F3, and the deformation F4 due to aging due to the rotation of the blade 109a at the position S2. Even if there is F5, it is set to 1.1 times or more the value at which the blade outer periphery 109d and the round cylindrical portion 301b do not contact each other.

By the way, the round cylindrical portion 301b is not a cylindrical shape having the same diameter in the axial direction like the suction side cylindrical portion 110b and the blowout side cylindrical portion 110c of the first embodiment, but the deformation of the propeller fan 109 (blade 109a) or the like ( F1 + F2 + F3 + F4 + F5 + G1) is a substantially round shape R2. However, in the case of such a substantially round shape R2, the gap between the blade outer periphery 109d and the round cylindrical portion 301b is constant at any position in the axial direction during the rotation of the propeller fan 109. However, the anxiety that the propeller fan 109 and the bell mouth 300 are in contact with each other cannot be resolved. Therefore, in the third embodiment, the clearance between the trailing edge side blade outer periphery 109g of the blade 109a and the round cylindrical portion 301b is set based on the formula ((F1 + F2 + F3 + F4 + F5 + G1) × 1.1 or more). The clearance between the round cylindrical portion 301b upstream of the trailing edge side blade outer periphery 109g and the propeller fan 109 includes all of the radial deformation F1, the manufacturing error F2, the assembly error F3 due to the rotation of the blade 109a, and the deformation F4 due to secular change. Considering this, it is preferable that the value be set to less than 1.1 times the value at which the blade outer periphery 109d does not contact the round cylindrical portion 301b even if there is a disturbance F5 during the rotation of the propeller fan 109. Note that the substantially round shape R2 is not limited to a circular arc (R) having a strict cross section, but includes a substantially R shape formed from a curve, a taper, or the like.

The blower 101C according to the third embodiment is configured such that the diameter of the bell mouth 300 facing the blade outer periphery 109d of the propeller fan 109 gradually increases from the suction side to the blow side of the bell mouth 300, and The clearance between the bell mouth 300 and the propeller fan 109 at the position S2 on the most blowing side of the bell mouth 300 facing the blade outer periphery 109d of the propeller fan 109 is formed into a radial deformation F1 due to the rotation of the blade 109a at the position S2. In consideration of all of the error F2, the assembly error F3, and the deformation F4 due to secular change, 1.1 times the value at which the blade outer periphery 109d does not contact the round cylindrical portion 301b even if there is a disturbance F5 during the rotation of the propeller fan 109 That's it. Thereby, it becomes possible to make the clearance gap between the round cylindrical part 301b and the propeller fan 109 smaller than before, and the ventilation performance which is the effect of the duct type bell mouth 300 can be aimed at. Further, according to the blower 101C, the gap at the position S2 on the most blown side of the round cylindrical portion 301b is formed to be larger than the gap on the upstream side of the position S2, so that the rotation of the propeller fan 109 is performed. It is possible to eliminate the user's anxiety that the propeller fan 109 and the bell mouth 110 are in contact with each other. That is, according to the third embodiment, as in the first embodiment and the second embodiment, it is possible to provide a design that does not make the user feel uneasy and to improve fan performance.

Next, the outdoor unit 401 of the air conditioner provided with the blower 101A will be described with reference to FIGS. 7 and 8, the illustration of the fan guard is omitted. In the following description, the case where the blower 101A of the present embodiment is applied to the lateral blow type outdoor unit 401 will be described as an example, but the present invention can be applied to an upper blow type outdoor unit, and the same effect can be obtained. Obtainable. In FIGS. 7 and 8, the case where the blower 101 A is applied is described as an example, but the blowers 101 B and 101 C of the other embodiments described above can be similarly applied.

As shown in FIG. 7, in the outdoor unit 401, the bottom plate 402, the top plate 403, the front plate 404, the back plate 405 (see FIG. 8), and the

side plates

406 and 406 constitute the outer wall 410 of the outdoor unit 401. Further, the bell mouth 110 of the present embodiment described above is integrally configured by sheet metal molding with the front plate 404 of the outer wall 410. Thus, by forming the front plate 404 and the bell mouth 110 integrally, the cost can be reduced compared to the case where the front plate 404 and the bell mouth 110 are configured separately.

As shown in FIG. 8, in the outer wall 410, a heat exchanger 407, a propeller fan 109, a fan motor 104 that rotates the propeller fan 109, a compressor 408, a control device that controls the fan motor 104 and the compressor 408 ( Etc.) are arranged. In such an outdoor unit 401, the heat exchanger 407 is formed in an L shape when viewed from above on the back surface and one side surface in the outer wall 410, so that the heat exchange performance can be improved. In addition, the heat exchange performance of the heat exchanger 407 provided on the side surface is impaired by providing the suction side position of the bell mouth 110 at a substantially intermediate portion in the axial direction G (see FIG. 2) of the propeller fan 109. Can be reduced.

In the outdoor unit 401, the heat exchanger 407, the propeller fan 109, the fan motor 104, and the like constitute a blower chamber 411, and the compressor 408, a control device (not shown), and the like constitute a machine room 412. . The blower chamber 411 and the machine chamber 412 are partitioned by a partition plate 413. Further, an indoor unit (not shown) connected to the outdoor unit 401 is configured with a known unit including an indoor heat exchanger, an expansion valve, and the like, and is connected to the outdoor unit 401 via a refrigerant pipe.

Thus, according to the outdoor unit 401 to which the air blower 101A of the present embodiment is applied, the air blowing performance can be improved as compared with the case where the conventional bell mouth 500 (see FIG. 9) is applied. The rotation speed of the propeller fan 109 can be reduced as compared with the conventional one, and thus the blowing noise can be reduced.

By the way, as shown in FIG. 10, for example, during the rain 601 in winter, when the rainwater 602 accumulated (attached) on the top plate 503 or the front plate 504 of the outdoor unit 501 flows, the rainwater 602 is at the position of the bell mouth 500. Flows and hangs down on the trailing edge of the propeller fan 109. At this time, when the outside air temperature becomes 0 ° C. or lower, there is a possibility that the space between the bell mouth 500 and the rear edge side blade outer periphery 109g is frozen (603). When the operation of the outdoor unit 510 is started in such a state of freezing (603), the propeller fan 109 may break as soon as the propeller fan 109 rotates (because it is made of resin).

In addition, such icing phenomenon is caused by the fact that the temperature of the propeller fan 109 is 0 ° C. or lower even when it rains when the outside air temperature is approximately 0 ° C. during winter operation. It also occurs during frost operation. That is, during the heating operation, very cold wind is emitted from the outdoor unit 510. Therefore, when the outside air temperature is 0 ° C. or lower, if air or rain is sucked from the heat exchanger 507 side, the heat exchanger 507 is frozen. Will do. If icing is performed in this way, heating operation cannot be performed, so defrosting operation must be performed. Since the heat exchanger 507 is heated during the defrosting operation, the ice melts. At this time, since the propeller fan 109 is stopped, an icicle is generated, and the gap between the propeller fan 109 and the bell mouth 500 is filled. Thereafter, when the propeller fan 109 rotates, the propeller fan (blade) may break.

Therefore, by applying the air blower 101A of the present embodiment (the same applies to the

air blowers

101B and 101C) to the outdoor unit 401 of the air conditioner, the rear edge side wing outer periphery 109g of the propeller fan 109 and the bell mouth 110 opposed thereto are provided. In order to prevent freezing, the gap 112 (see FIG. 4) is 1.1 times or more the gap 115 (see FIG. 9) between the conventional bell mouth 500 and the propeller fan 109, which is the minimum necessary gap. It becomes possible to enhance the effect.

In this embodiment, the outdoor unit 401 of the air conditioner has been described as an example. However, the present invention is not limited to this and may be applied to a ventilation fan or the like.

101A, 101B, 101C Air blower 102 Bell mouth mounting plate 103 Motor clamp 104 Fan motor 109 Propeller fan 109a Blade

109b Front edge

109c Trailing edge 109d Blade outer periphery 109e Front edge side blade outer periphery 109g Rear edge side blade outer periphery 109s Hub 110 Bellmouth 110a Suction R
110b suction-side cylindrical portion 110c clearance between outlet side cylindrical portion 110d tapered portion 110e opening edge 111 blade outer periphery suction-side cylindrical portion of the bell mouth _(G A)
112 wing outer periphery and a gap between the outlet side cylindrical portion of the bell mouth _(G B)
113 Line representing outer peripheral shape of rotating blade 200 Bellmouth 201a Suction R
201b Suction side cylindrical portion 201c Blow-out side round cylindrical portion 201d Taper portion 201e Blowout R
300 Bellmouth 301a Suction R
301b Round cylindrical part 301c
401 Outdoor unit of air conditioner 402 Bottom plate 403 Top plate 404 Front plate 405 Back surface 406 Side surface 407 Heat exchanger 408 Compressor G Axial direction W Fan rotation direction

Claims

In a blower provided with a resin propeller fan, a fan motor that rotates the propeller fan, and a cylindrical bell mouth that surrounds the propeller fan,
When viewed from the rotation axis direction of the propeller fan, a gap between the outer periphery of the propeller fan and the suction side cylindrical portion of the bell mouth is formed to be larger than the clearance between the outer periphery of the blade and the blowout side cylindrical portion of the bell mouth. And while forming the length of the axial direction of the suction side cylindrical part longer than the blowout side cylindrical part,
The gap between the suction side cylindrical portion and the outer periphery of the blade is determined based on the propeller fan in consideration of all radial deformation due to rotation of the blade facing the suction side cylindrical portion, manufacturing error, assembly error, and deformation due to secular change. Even if there is a disturbance during the rotation of the blade, the blade outer periphery and the suction side cylindrical portion are set to a value that does not contact, and
The gap between the blowout side cylindrical portion and the outer periphery of the blade is determined based on the propeller fan in consideration of all radial deformation due to rotation of the blade facing the blowout side cylindrical portion, manufacturing error, assembly error, and deformation due to secular change. Even if there is a disturbance during the rotation of the air blower, the blower is characterized by being 1.1 times or more the value at which the outer periphery of the blade and the blowout side cylindrical portion do not contact each other.
The blowout cylindrical portion of the bell mouth is formed so that the diameter of the bellmouth gradually increases from the suction side to the blowout side of the blowout cylindrical portion, and
The gap between the bell mouth and the propeller fan facing each other at the position on the most blowing side of the outer periphery of the blade of the propeller fan is due to radial deformation due to rotation of the blade at the position, manufacturing error, assembly error, and secular change. In consideration of all deformations, even if there is a disturbance during the rotation of the propeller fan, the blade outer periphery and the blow-out side cylindrical portion are 1.1 times or more of the values that do not contact each other. Item 1. The air blower according to item 1.
In a blower provided with a resin propeller fan, a fan motor that rotates the propeller fan, and a cylindrical bell mouth that surrounds the propeller fan,
The diameter of the bell mouth facing the outer periphery of the wing of the propeller fan is configured to gradually increase from the suction side of the bell mouth toward the blowing side, and
The gap between the bell mouth and the propeller fan facing each other at the position on the most blowing side of the outer periphery of the blade of the propeller fan is a radial deformation due to rotation of the blade at the position, a manufacturing error, an assembly error, and a deformation due to secular change. In consideration of all of the above, the blower characterized in that it is 1.1 times or more the value at which the outer periphery of the blade and the blowout side cylindrical portion do not contact even if there is a disturbance during the rotation of the propeller fan.
An outdoor unit for an air conditioner comprising the blower device according to any one of claims 1 to 3.
The outdoor unit of an air conditioner according to claim 4, wherein the bell mouth and the parts constituting the outer wall of the outdoor unit are integrally formed by sheet metal molding.