CN109072942B

CN109072942B - Air supply device

Info

Publication number: CN109072942B
Application number: CN201780026064.0A
Authority: CN
Inventors: 岛本昌和
Original assignee: Nidec Servo Corp
Current assignee: Nidec Advanced Motor Corp
Priority date: 2016-04-28
Filing date: 2017-04-28
Publication date: 2020-07-03
Anticipated expiration: 2037-04-28
Also published as: JPWO2017188436A1; WO2017188436A1; CN109072942A

Abstract

In the blower device according to one aspect of the present invention, the lead cable is drawn out from the inside of the housing portion to the outside of the housing portion through the cable drawing passage. The sealing material is disposed inside the housing portion and on the cable lead-out passage. The cable guide part comprises: a 1 st projection projecting from an inner side surface on one side in the circumferential direction in the cable lead-out passage and extending in the axial direction; and a 2 nd projection projecting from an inner side surface of the other circumferential side in the cable lead-out passage and extending in the axial direction. The tube has: a 1 st recess which is provided on an outer surface of the pipe, is recessed in a circumferential direction, and has a 1 st projection inserted therein; and a 2 nd concave portion which is provided on an outer side surface of the pipe, is recessed in the circumferential direction, and is inserted with the 2 nd convex portion. The 1 st projection is in contact with a portion constituting the 1 st recess in the outer side surface of the tube, and the 2 nd projection is in contact with a portion constituting the 2 nd recess in the outer side surface of the tube.

Description

Air supply device

Technical Field

The present invention relates to an air blowing device.

Background

Conventionally, there is known a blower having a circuit board provided with an electronic circuit for supplying a predetermined current to a stator winding. For example, in the blower disclosed in japanese laid-open patent publication No. 2002-5093, a lead wire for supplying power is connected to a circuit board.

However, in the case where the blower as described above is used in, for example, a communication base station or the like, the blower is installed outdoors. Therefore, it is necessary to cover the circuit board with a sealing material and to apply a waterproof measure and a dustproof measure to the blower.

In order to cover the circuit board with the sealing material, a method of flowing a liquid sealing material into a housing portion for housing the circuit board in the blower and curing the sealing material is considered. Here, the blower is provided with a cable guide portion for leading out a lead wire connected to the circuit board to the outside of the blower. Therefore, the sealing material flowing into the housing may leak to the outside of the blower through the cable guide. If the sealing material leaks, the sealing of the circuit board may be insufficient. Further, the air volume characteristics of the blower may be degraded by the leaked sealing material.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide an air blower having a structure capable of suppressing leakage of a sealing material.

An air blowing device according to an exemplary embodiment of the present invention includes: an impeller rotatable about a central axis extending in one direction; a motor that is disposed axially below the impeller and rotates the impeller about the central axis; a circuit board, at least a part of which is axially overlapped with the motor and is electrically connected with the motor; a lead cable having a lead electrically connected to the circuit board and a tube covering the lead; a motor support portion having an accommodating portion arranged on an axial lower side of the motor and accommodating the circuit board, and supporting the motor from the axial lower side; a casing which is disposed radially outward of the motor support portion and circumferentially surrounds the impeller and the motor; a plurality of ribs connecting the motor support portion and the housing; a cable guide portion extending from the motor support portion toward the housing along the rib; and a sealing material covering at least a part of the circuit board. The cable guide portion has a cable drawing passage that extends in an extending direction in which the cable guide portion extends and that opens at both ends in the extending direction of the cable guide portion, a 1 st opening portion on the motor support portion side of the cable drawing passage opens into the housing portion, a 2 nd opening portion on the case side of the cable drawing passage opens out of the housing portion, the lead cable is drawn out from the inside of the housing portion to the outside of the housing portion via the cable drawing passage, and the sealing material is disposed in the housing portion and the cable drawing passage, the cable guide portion having: a 1 st projection projecting from an inner side surface on one side in the circumferential direction in the cable lead-out passage and extending in the axial direction; and a 2 nd projection projecting from an inner side surface on the other side in the circumferential direction in the cable lead-out passage and extending in the axial direction. The tube has: a 1 st recessed portion provided on an outer side surface of the pipe, recessed in a circumferential direction, and into which the 1 st raised portion is inserted; and a 2 nd concave portion provided on an outer side surface of the pipe, recessed in a circumferential direction, and into which the 2 nd convex portion is inserted. The 1 st projection contacts a portion of the outer side surface of the tube constituting the 1 st recess, and the 2 nd projection contacts a portion of the outer side surface of the tube constituting the 2 nd recess.

According to one aspect of the present invention, there is provided an air blower having a structure capable of suppressing leakage of a sealing material.

The above and other features, elements, steps, features and advantages of the present invention will be more clearly understood from the following detailed description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings.

Drawings

Fig. 1 is a sectional view showing an air blowing device of the present embodiment.

Fig. 2 is a bottom view of the blower of the present embodiment as viewed from below.

Fig. 3 is a perspective view of a portion of the blower of the present embodiment as viewed from below.

Fig. 4 is a bottom view of a part of the blower of the present embodiment as viewed from below.

Fig. 5 is a view showing the cable guide and the lead cable according to the present embodiment, and is a V-V sectional view in fig. 4.

Fig. 6 is a bottom view of the cable guide and the lead cable of the present embodiment, as viewed from below.

Fig. 7 is a cross-sectional view showing a cable guide and a lead cable according to another example of the present embodiment.

Detailed Description

As shown in fig. 1, the blower 10 of the present embodiment includes an impeller 20 rotatable about a center axis J extending in one direction, a motor 30, a motor support 40, a circuit board 80, a casing 50, a plurality of ribs 60, a cable guide 70, a lead cable 81, and a sealing material 90. In the present embodiment, one direction in which the central axis J extends is the vertical direction. In addition, the Z-axis direction shown in each drawing indicates the vertical direction.

In the following description, a direction parallel to the central axis J may be simply referred to as an "axial direction", a radial direction about the central axis J may be simply referred to as a "radial direction", and a circumferential direction about the central axis J may be simply referred to as a "circumferential direction". In the axial direction, the axially upper side may be simply referred to as "upper side" and the axially lower side may be simply referred to as "lower side". The vertical direction, the upper side, and the lower side are names used for explanation only, and do not limit the actual positional relationship and direction. In each drawing, the positive side in the Z-axis direction represents the upper side, and the negative side in the Z-axis direction represents the lower side.

The impeller 20 includes an impeller cup 21 and a plurality of blades 22, the impeller cup 21 is formed in a cylindrical shape having a downward opening, and the plurality of blades 22 are arranged along a circumferential direction on an outer circumferential surface of the impeller cup 21.

The motor 30 is disposed axially below the impeller 20, and rotates the impeller 20 about the central axis J. The motor 30 is disposed inside the impeller cup 21. In the present embodiment, the motor 30 rotates the impeller 20 counterclockwise, for example, when viewed from above. In the following description, a side on which the blades 22 in the circumferential direction advance, that is, a side that advances clockwise when viewed from below may be referred to as a "downstream side", and a side opposite to the side on which the blades 22 in the circumferential direction advance, that is, a side that advances counterclockwise when viewed from below may be referred to as an "upstream side".

The motor 30 includes a shaft 31, a stator 34, a rotor cup 32, and a rotor magnet 33. The shaft 31 extends in the axial direction around the center axis J. The shaft 31 is inserted radially inward of a stator support 41 described later. The shaft 31 is rotatably supported by a radially inner surface of the stator support portion 41 via a bearing. An impeller cup 21 is fixed to the upper end of the shaft 31. The stator 34 is annular and surrounds the shaft 31 in the circumferential direction. The stator 34 is fixed to the outer peripheral surface of the stator support portion 41. The fixing method of the stator 34 is not particularly limited, and fitting, bonding, press-fitting, and the like are available. The stator 34 is electrically connected to the circuit board 80.

The rotor cup 32 is cylindrical with a downward opening, and is disposed radially outward of the stator 34. The upper portion of the rotor cup 32 is disposed radially inward of the impeller cup 21. The rotor cup 32 is fixed to the impeller cup 21. The fixing structure of the rotor cup 32, the impeller cup 21, and the shaft 31 is not limited to this. Rotor magnet 33 is fixed to the inner circumferential surface of rotor cup 32. That is, rotor magnet 33 is fixed to impeller 20 via rotor cup 32. The rotor magnet 33 is, for example, cylindrical. The rotor magnet 33 is opposed to the stator 34 with a gap in the radial direction on the outer side in the radial direction of the stator 34.

The rotor cup 32 is cylindrical and open at the lower side, and is provided radially outside the stator 34. The upper portion of the rotor cup 32 is disposed radially inward of the impeller cup 21. The rotor cup 32 is fixed to the impeller cup 21. Rotor magnet 33 is fixed to the inner circumferential surface of rotor cup 32. That is, rotor magnet 33 is fixed to impeller 20 via rotor cup 32. For example, the rotor magnet 33 has a cylindrical shape. The rotor magnet 33 is opposed to the stator 34 with a gap in the radial direction on the outer side in the radial direction of the stator 34.

The motor support portion 40 supports the motor 30 from the lower side. The motor support portion 40 has a housing portion 42 and a stator support portion 41. The accommodating portion 42 is shaped like a cup opened to the upper side in the axial direction. The accommodating portion 42 accommodates the circuit board 80. The accommodating portion 42 is disposed axially below the motor 30.

The accommodating portion 42 has: a bottom surface portion 42a that expands in the radial direction; and a cup-shaped cylindrical portion 42b extending upward from the radially outer edge of the bottom surface portion 42 a. The bottom surface portion 42a has a bottom surface portion through hole 42c that penetrates the bottom surface portion 42a in the axial direction. The bottom surface portion through hole 42c is provided in the radial outer edge of the bottom surface portion 42 a. As shown in fig. 2, the bottom through hole 42c has a substantially rectangular shape when viewed in the axial direction.

As shown in fig. 1, the cylindrical portion 42b circumferentially surrounds the stator 34, the rotor cup 32, and the radially outer side of the lower end of the rotor magnet 33. The stator support portion 41 extends axially upward from the bottom surface portion 42 a. The stator support portion 41 is cylindrical with the center axis J as the center.

The circuit board 80 has a plate shape extending in the radial direction. The circuit board 80 is disposed radially inward of the cylindrical portion 42 b. The circuit board 80 is disposed below the motor 30, and at least a part of the circuit board 80 overlaps the motor 30 in the axial direction. The circuit board 80 is fixed to the motor support portion 40, for example. The coil of the stator 34 is connected to the circuit board 80. Thereby, the circuit board 80 is electrically connected to the motor 30.

The housing 50 is disposed radially outward of the motor support portion 40. As shown in fig. 1 and 2, the housing 50 has a square cylindrical shape extending in the axial direction. The casing 50 circumferentially surrounds the impeller 20 and the motor 30 from the radially outer side. In fig. 1, the lower end of the casing 50 is located at the same position in the axial direction as the lower end of the motor support 40. In fig. 2, the outer shape of the casing 50 is substantially square when viewed from the axial direction. The housing 50 has corner portions 50a arranged at four corners. The corner portion 50a has a substantially triangular shape when viewed in the axial direction. The lower surface of the corner portion 50a has a slant surface portion 50b at a radially inner portion, and the slant surface portion 50b is located at an upper side as going from a radially outer side to a radially inner side. A cable fixing portion 51 for fixing the lead cable 81 is provided on one of the corner portions 50 a.

The plurality of ribs 60 connect the motor support 40 and the housing 50. More specifically, the plurality of ribs 60 connect the outer peripheral surface of the accommodating portion 42 and the radially inner side surface of the housing 50. The plurality of ribs 60 are arranged at equal intervals in the circumferential direction. The radially outer end of the rib 60 is connected to the radially inner side of the casing 50. More specifically, the radially outer end of the rib 60 is connected to the circumferential end of the inclined surface portion 50 b. In fig. 2, 8 ribs 60 are provided. The 8 ribs 60 are connected to both circumferential ends of the 4 inclined surface portions 50b, respectively.

The ribs 60 extend in a direction inclined with respect to the radial direction when viewed from the axial direction. In fig. 2, the rib 60 is curved in the circumferential direction when viewed from the axial direction. More specifically, the rib 60 is curved from the radially inner side toward the radially outer side to the upstream side. The rib 60 is formed of a plurality of portions having different curvatures, for example.

The rib 60 has a blade shape having a wind receiving surface 60a inclined with respect to the axial direction. The wind receiving surface 60a is an inclined surface that faces the impeller 20 side of the rib 60 so that the axially lower end edge is positioned on the downstream side in the rotation direction of the impeller 20 than the axially upper end edge in any radial cross section. The upper end of the wind receiving surface 60a is connected to the lower end of the wind receiving surface 60a by a flat surface or a smooth curved surface. The ribs 60 function as stationary blades for rectifying the wind transmitted by the impeller 20.

The cable guide 70 extends from the motor support 40 toward the housing 50 along the rib 60. More specifically, the cable guide 70 extends while being bent from the outer peripheral surface of the housing 42 toward the radially inner side surface of the housing 50 toward the upstream side. The end of the cable guide 70 on the side of the housing 50 is located radially inward of the radially inner surface of the housing 50. The cable guide 70 is connected to a downstream side of one of the ribs 60 among the plurality of ribs 60.

As shown in fig. 3 and 4, the cable guide 70 has a cable drawing passage 70 a. The cable lead-out passage 70a extends along the extending direction in which the cable guide 70 extends. The cable lead-out passage 70a extends in a direction inclined with respect to the radial direction when viewed from the axial direction. The cable lead-out passage 70a is curved in the circumferential direction when viewed in the axial direction. The cable drawing path 70a is open at both ends in the extending direction of the cable guide 70.

In addition, in the present specification, the "extending direction of the cable guide portion" includes a direction in which a curve C1 extends, the curve C1 connecting the circumferential centers of the cable guide portions at each radial position when viewed from the axial direction. In the following description, the extending direction of the cable guide 70 is simply referred to as "extending direction".

The 1 st opening 70b of the cable drawing passage 70a on the motor support portion 40 side opens into the housing portion 42. The 1 st opening 70b is connected to the bottom through hole 42 c. The 2 nd opening 70c of the cable drawing passage 70a on the side of the housing 50 opens to the outside of the housing 42. The 2 nd opening 70c faces the radially inner surface of the housing 50 with a gap therebetween.

The cable drawing passage 70 has a large size in the width direction perpendicular to both the extending direction and the axial direction at both ends of the cable drawing passage 70a in the extending direction, that is, the 1 st opening 70b and the 2 nd opening 70 c. As shown in fig. 3, in the present embodiment, the cable drawing passage 70a is a groove having a 3 rd opening 70d on the lower side in the axial direction. The cable drawing passage 70a may be a groove that opens upward in the axial direction.

In addition, in the present specification, the "width direction" includes a direction in which a line segment C2 perpendicular to the curve C1 extends when viewed from the axial direction. In fig. 4, only 1 line segment C2 is representatively shown, but the line segment C2 is defined in accordance with the position in the extending direction of each curve C1. In fig. 4, the direction in which the line segment C2 extends differs according to the position of the extending direction of the curve C1.

The cable guide 70 has a connection projection 74. The connection projection 74 projects from the inner surface of the cable drawing passage 70 a. The plurality of connecting projections 74 are provided at intervals in the extending direction. The number of the connecting projections 74 is, for example, 3. The connecting projection 74 has a U-shape that opens toward the 3 rd opening 70 d.

As shown in fig. 5, the connection convex portion 74 is formed by connecting the 1 st convex portion 71, the 2 nd convex portion 72, and the 3 rd convex portion 73. That is, the cable guide 70 has the 1 st, 2 nd, and 3 rd

convex portions

71, 72, and 73. In the present embodiment, since 3 connecting convex portions 74 are provided, 3 convex portions 1, 2, and 3 are provided for each of the

convex portions

71, 72, and 73. That is, the cable guide 70 has a plurality of 1 st convex portions 71, a plurality of 2 nd convex portions 72, and a plurality of 3 rd convex portions 73.

As shown in fig. 4, the 1 st projection 71 projects from the upstream inner surface 70e of the cable drawing passage 70 a. The 2 nd projection 72 projects from the inner surface 70f on the downstream side in the cable drawing passage 70 a. The 1 st projection 71 and the 2 nd projection 72 extend in the axial direction.

As shown in fig. 5, the 1 st projection 71 and the 2 nd projection 72 are disposed so as to be axially spaced upward from the end of the cable drawing passage 70a on the 3 rd opening 70d side.

As shown in fig. 4, in each of the connecting convex portions 74, the 1 st convex portion 71 and the 2 nd convex portion 72 are opposed with a gap in the circumferential direction. In the present embodiment, since the cable drawing passage 70a is curved in the circumferential direction when viewed from the axial direction, the 1 st projection 71 and the 2 nd projection 72 that are opposed in the circumferential direction are located at positions different from each other in the extending direction. That is, the cable guide 70 has the 1 st projection 71 and the 2 nd projection 72 whose positions in the extending direction are different from each other. In the present embodiment, the positions of the 31 st convex portions 71 and the 32 nd convex portions 72 in the extending direction are different from each other, and the 1 st convex portions 71 and the 2 nd convex portions 72 are alternately provided when passing through the cable drawing passage 70a along the extending direction.

As shown in fig. 6, the sectional shape of the 1 st projection 71 is a substantially rectangular shape with rounded corners. That is, the 1 st projection 71 has a curved surface portion 71a at the corner. The cross-sectional shape of the 2 nd projection 72 is also the same as the cross-sectional shape of the 1 st projection 71, which is not shown. That is, the 1 st projection 71 and the 2 nd projection 72 have curved surfaces.

As shown in fig. 5, the 3 rd projection 73 projects from an inner surface 70g facing axially downward in the cable drawing passage 70 a. As shown in fig. 4, the 3 rd projection 73 extends in the substantially circumferential direction. The 3 rd convex portions 73 are arranged at equal intervals in the radial direction. As shown in fig. 5, the 3 rd convex portion 73 connects the upper end of the 1 st convex portion 71 and the upper end of the 2 nd convex portion 72.

As shown in fig. 1, the lead cable 81 is connected to the circuit board 80. As shown in fig. 1 and 2, the lead cable 81 is drawn out from the inside of the housing portion 42 to the outside of the housing portion 42 through the cable drawing passage 70 a. More specifically, the lead cable 81 is guided from the bottom through hole 42c into the cable drawing path 70a through the 1 st opening 70b, and is drawn out from the 2 nd opening 70c to the outside of the housing portion 42. The lead cable 81 led to the outside is fixed to the cable fixing portion 51 of the housing 50, and led to a position radially outward of the housing 50.

The lead cable 81 has a lead 82 and a tube 83. The lead 82 is electrically connected to the circuit board 80. The lead 82 is connected to the lower surface of the circuit board 80. The lead 82 is provided in plural, for example. In fig. 1, 4 leads 82 are provided. The tube 83 covers the lead 82. In the present embodiment, the tube 83 covers the bundled plurality of leads 82. The tube 83 has insulation properties. The tube 83 is, for example, a heat shrinkable tube. The plurality of leads 82 are covered with a tube 83 before heat shrinkage, and the tube 83 is heated. In a state where the tube 83 is thermally shrunk to some extent, the lead cable 81 is inserted into the cable drawing passage 70a from the 3 rd opening 70 d. Thereby, the lead cable 81 is inserted into the cable drawing passage 70 a. The structure of the pipe 83 will be described in detail later.

As shown in fig. 1 and 5, the sealing member 90 is disposed inside the housing portion 42 and on the cable drawing path 70 a. In fig. 1, the sealing material 90 is filled in a lower portion of the inside of the housing portion 42. The sealing material 90 covers at least a portion of the circuit board 80. In fig. 1, the circuit board 80 is embedded in the sealing material 90, and the sealing material 90 covers the entire circuit board 80. The sealing material 90 is, for example, silicone.

As shown in fig. 1 and 5, the sealing material 90 flows into the accommodating portion 42 from above in a liquid state. At this time, the auxiliary tool F is disposed on the lower surface of the motor support portion 40. The auxiliary tool F closes the bottom surface portion through hole 42c and the 3 rd opening 70d from below. This can prevent the liquid sealing material 90 that has flowed into the interior of the housing portion 42 from leaking downward through the bottom portion through hole 42c and the 3 rd opening 70 d. After the liquid sealant 90 is poured, the sealant 90 is cured.

Next, the structure of the tube 83 will be described in detail. As shown in fig. 5, the pipe 83 has a 1 st recess 84a, a 2 nd recess 84b, and a 3 rd recess 84 c. The 1 st, 2 nd, and 3

rd recesses

84a, 84b, and 84c are provided on the outer surface of the pipe 83. The 1 st recessed portion 84a is a recessed portion recessed in the circumferential direction and into which the 1 st projecting portion 71 is inserted. The 2 nd concave portion 84b is a concave portion that is recessed in the circumferential direction and into which the 2 nd convex portion 72 is inserted.

As shown in fig. 6, the inner surface of the 1 st concave portion 84a is in close contact with the 1 st convex portion 71. That is, the 1 st projection 71 contacts a portion constituting the 1 st recess 84a in the outer side surface of the pipe 83. Similarly, the inner surface of the 2 nd concave portion 84b is in close contact with the 2 nd convex portion 72. That is, the 2 nd convex portion 72 contacts a portion constituting the 2 nd concave portion 84b in the outer side surface of the tube 83. Therefore, the tube 83 contacts the cable guide 70 from the inside of the cable drawing passage 70a via the 1 st projection 71 and the 2 nd projection 72 on both sides in the circumferential direction. Thereby, the sealing material 90 is blocked by the contact portion between the tube 83 and the 1 st convex portion 71 and the 2 nd convex portion 72. Accordingly, the liquid sealing material 90 flowing into the housing portion 42 can be prevented from leaking from the 2 nd opening 70c to the outside of the cable drawing passage 70 a. Further, entry of water droplets and the like from the outside through the cable lead-out passage 70a can be suppressed.

For example, if the sealing material 90 leaks from the 2 nd opening 70c, the position of the upper surface of the sealing material 90 shown in fig. 1 is lowered, and the circuit board 80 may be exposed. Therefore, the waterproof and dustproof properties of the blower may be insufficient. In contrast, according to the present embodiment, since the sealing material 90 can be prevented from leaking, the circuit board 80 can be prevented from being exposed while the position of the upper surface of the sealing material 90 is prevented from being lowered. At the same time, the gap for water inflow from the outside can be eliminated. Accordingly, the drop in the water resistance and dust resistance of the blower 10 can be suppressed.

Further, for example, if the sealing material 90 leaking from the 2 nd opening 70c is cured in a state of being attached to the outer surface of the cable guide 70, the flow of the wind transmitted from the impeller 20 is blocked by the cured sealing material 90, which may cause a reduction in the air volume characteristic of the blower 10. In contrast, according to the present embodiment, since the leakage of the sealing material 90 can be suppressed, the drop in the air volume characteristics of the blower device 10 can be suppressed.

For example, the following methods may also be considered: when the sealing material 90 leaks from the 2 nd opening 70c to expose the circuit board 80, the sealing material 90 is cured and then flows into the circuit board 80 again to cover the circuit board 80. However, in this case, since the step of flowing the sealing material 90 is required to be performed twice, the number of steps for manufacturing the blower increases. Also, for example, the following methods may be considered: before the sealing material 90 is poured into the housing portion 42, the 2 nd opening 70c of the cable drawing path 70a is sealed by some method, thereby suppressing the leakage of the sealing material 90 from the 2 nd opening. However, in this case, the step of sealing the 2 nd opening 70c is also required, and the number of steps for manufacturing the blower increases. Therefore, there is a problem that the labor, time, and cost for manufacturing the blower device increase. In contrast, according to the present embodiment, since the lead cable 81 is disposed in the cable lead-out passage 70a, leakage of the sealing material 90 can be suppressed, and thus, increase in labor, time, and cost for manufacturing the blower device 10 can be suppressed.

As described above, the 1 st projection 71 and the 2 nd projection 72 are provided at positions different from each other in the extending direction of the cable guide 70. Therefore, bending stress in the width direction can be applied to the lead cable 81, and the lead cable 81 can be pressed more firmly against the 1 st and 2 nd

convex portions

71 and 72. This can further suppress leakage of the sealing material 90. Further, by providing the 1 st projection 71 and the 2 nd projection 72 which are different from each other in the extending direction position, it is possible to suppress a part of the cable drawing passage 70a from being narrowed in the extending direction. This facilitates insertion of the lead cable 81 into the cable drawing passage 70 a.

The rib 60 and the cable drawing passage 70a extend in a direction inclined with respect to the radial direction when viewed from the axial direction. Therefore, when the lead cable 81 is looped from the circuit board 80 to the cable fixing portion 51, bending stress is applied to the lead cable 81 by passing through the cable drawing passage 70 a. This makes it easy to press the lead cable 81 more firmly against the 1 st and 2 nd

convex portions

71 and 72. Thus, the leakage of the sealing material 90 can be more suppressed.

The rib 60 and the cable drawing passage 70a are curved in the circumferential direction when viewed from the axial direction. Therefore, by passing the linear lead cable 81 through the cable drawing passage 70a in a natural state, the lead cable 81 bends along the cable drawing passage 70a, and the lead cable 81 is pressed more firmly against the 1 st projection 71 and the 2 nd projection 72. Thus, the leakage of the sealing material 90 can be more suppressed.

Further, since the 1 st projection 71 and the 2 nd projection 72 are provided in plural numbers, leakage of the sealing material 90 can be further suppressed.

Further, in the case where the ribs 60 have a blade shape and function as stationary blades as in the present embodiment, if the dimension in the extending direction of the cable guide 70 is too large, the rectifying effect by the ribs 60 may be hindered by the cable guide 70, and the air volume characteristic of the blower may be reduced. Therefore, the dimension of the cable guide 70 in the extending direction is preferably relatively small. However, in this case, the distance from the housing portion 42 to the 2 nd opening 70c becomes short, and the sealing material 90 easily leaks from the 2 nd opening 70 c. Further, since the 2 nd opening 70c is opened to the outside of the housing portion 42 on the radial inner side of the casing 50, the leaked sealing material 90 more easily affects the air volume characteristic of the blower in the case where the sealing material 90 leaks. Therefore, when the rib 60 has a blade shape, the effect of suppressing the leakage of the sealing material 90 described above is obtained particularly greatly.

In the present embodiment, since the 2 nd opening 70c faces the radially inner surface of the housing 50 with a gap therebetween as described above, the dimension of the cable guide 70 in the extending direction can be reduced as compared with the case where the cable guide 70 is connected to the radially inner surface of the housing 50. Thus, when the lead cable 81 is looped from the circuit board 80 to the cable fixing portion 51, the lead cable 81 is inserted through the cable drawing passage 70a, so that bending stress is easily applied to a part of the lead cable 81. Therefore, the lead cable 81 is easily pressed more firmly against the 1 st and 2 nd

convex portions

71 and 72. Thus, the leakage of the sealing material 90 can be more suppressed. Further, since the cable guide 70 is relatively short, the rectifying effect by the rib 60 is less likely to be inhibited by the cable guide 70, and a decrease in the air volume characteristic of the blower 10 can be suppressed.

Further, for example, when the lead cable 81 is inserted into the cable drawing passage 70a, if the outer surface of the tube 83 is damaged by contact with the inner surface of the cable drawing passage 70a, the contact between the tube 83 and the 1 st projection 71 and the 2 nd projection 72 may be insufficient. In this case, the effect of suppressing the leakage of the sealing material 90 may be reduced.

In contrast, as described above, the 1 st opening 70b and the 2 nd opening 70c have large cable drawing passages 70a in the width direction. Therefore, the degree of freedom in disposing the lead cable 81 in the 1 st opening 70b and the 2 nd opening 70c is large, and the lead cable 81 is easily routed to the cable drawing path 70 a. This makes it easy to insert the lead cable 81 into the cable drawing passage 70a, and prevents excessive load from being applied to the tube 83 due to friction or the like. Thus, the tube 83 can be prevented from being damaged. As a result, the sealing material 90 can be prevented from leaking due to damage of the tube 83. The sealing material 90 can be suppressed from leaking. Moreover, the lead cable 81 is easily inserted into the cable drawing passage 70a, and the ease of assembly of the blower device 10 can be improved.

Further, since the cable drawing passage 70a is a groove, the lead cable 81 can be inserted from the 3 rd opening 70d as described above. This makes it easier to insert the lead cable 81 into the cable drawing passage 70a, and damage to the tube 83 can be suppressed. Therefore, the leakage of the sealing material 90 can be more suppressed. Further, the ease of assembly of the blower device 10 can be further improved.

Further, the 1 st projection 71 and the 2 nd projection 72 are disposed apart from the end of the cable drawing passage 70a on the 3 rd opening 70d side toward the side opposite to the 3 rd opening 70d in the axial direction. Therefore, when the lead cable 81 is inserted into the cable drawing passage 70a from the 3 rd opening 70d, the lead cable 81 is easily inserted into the cable drawing passage 70 a. This can further prevent the tube 83 from being damaged. Thus, the leakage of the sealing material 90 can be more suppressed. Further, the ease of assembly of the blower device 10 can be further improved.

The 1 st projection 71 and the 2 nd projection 72 have curved surfaces. Therefore, when the lead cable 81 is inserted into the cable drawing passage 70a, the contact portions of the tube 83 with the 1 st projection 71 and the 2 nd projection 72 can be suppressed from being damaged. This can further suppress leakage of the sealing material 90.

As shown in fig. 6, the tube 83 contacts the inner side surfaces 70e and 70f on both sides in the circumferential direction in the cable drawing passage 70a at a position different from the positions where the 1 st projection 71 and the 2 nd projection 72 are arranged. That is, the outer surface of the tube 83 is in contact with the cable guide 70 from the inside of the cable drawing passage 70a, except for the portions in contact with the respective convex portions. Therefore, the contact area between the tube 83 and the cable guide 70 can be increased, and the leakage of the sealing material 90 can be further suppressed.

Further, as in the present embodiment, when the 1 st protruding portion 71 and the 2 nd protruding portion 72 are arranged at different positions in the extending direction, when the pressure pipe 83 is pressed in the width direction by the 2 nd protruding portion 72, a portion of the pressing pipe 83 becomes a portion of the inner surface 70e where the 1 st protruding portion 71 is not arranged. Therefore, the tube 83 is easily brought into contact with the portion of the inner surface 70e other than the portion where the 1 st projection 71 is disposed. Similarly, when the tube 83 is pressed in the width direction by the 1 st convex portion 71, the portion of the inner surface 70f where the 2 nd convex portion 72 is not disposed is a portion where the tube 83 is pressed. Therefore, the tube 83 is easily brought into contact with the portion of the inner surface 70f other than the portion where the 2 nd convex portion 72 is arranged.

In fig. 6, the position of the inner surface 70e different from the position where the 1 st projection 71 is arranged includes the 1 st projections 71. That is, the tube 83 is in contact with the inner surface 70e of the cable drawing passage 70a on one circumferential side between the 1 st projections 71 in the extending direction. Although not shown, the position of the inner surface 70f different from the position where the 2 nd convex portion 72 is disposed includes the position between the 2 nd convex portions 72. That is, the tube 83 contacts the inner surface 70f on the other circumferential side in the cable drawing passage 70a between the 2 nd projecting portions 72 in the extending direction. Therefore, the sealing material 90 can be blocked between the 1 st convex portions 71 and between the 2 nd convex portions 72, and leakage of the sealing material 90 can be further suppressed.

In the case where 3 of the 1 st projection 71 and 3 of the 2 nd projection 72 are provided, as in the present embodiment, when the dimension of the cable drawing passage 70a in the extending direction is relatively short, it is easy to dispose the 1 st projection 71 and the 2 nd projection 72 at an appropriate interval. This allows the lead cable 81 to be appropriately brought into contact with both of the 1 st and 2 nd

convex portions

71 and 72 and the respective convex portions on the inner surface of the cable drawing passage 70 a. Thus, the leakage of the sealing material 90 can be more suppressed.

The 3 rd recessed portion 84c is a recessed portion recessed toward the lower side in the axial direction and into which the 3 rd projecting portion 73 is inserted. The inner surface of the 3 rd concave portion 84c is in close contact with the 3 rd convex portion 73. That is, the 3 rd convex portion 73 contacts a portion constituting the 3 rd concave portion 84c in the outer side surface of the tube 83. Therefore, the sealing material 90 is blocked by the contact portion between the tube 83 and the 3 rd convex portion 73. Accordingly, the passage of the sealing material 90 through the cable drawing passage 70a can be suppressed in the axial direction, and the leakage from the 2 nd opening 70c to the outside of the cable drawing passage 70a can be further suppressed.

Further, since the 3 rd convex portion 73 connects the upper end of the 1 st convex portion 71 and the upper end of the 2 nd convex portion 72, the passage of the sealing material 90 between the 1 st convex portion 71 and the 3 rd convex portion 73 and between the 2 nd convex portion 72 and the 3 rd convex portion 73 can be suppressed. This can further suppress leakage of the sealing material 90. Further, since the plurality of connecting convex portions 74 connecting the 1 st convex portion 71, the 2 nd convex portion 72, and the 3 rd convex portion 73 are provided, the leakage of the sealing material 90 can be further suppressed.

For example, when the lead cable 81 is inserted into the cable drawing passage 70a, the outer surface of the tube 83 is pressed by the 1 st convex portion 71, the 2 nd convex portion 72, and the 3 rd convex portion 73 and is plastically deformed, thereby forming the 1 st concave portion 84a, the 2 nd concave portion 84b, and the 3 rd concave portion 84 c. As described above, for example, the tube 83 is thermally contracted, and the lead cable 81 is pushed into the cable drawing passage 70 a. At this time, since the tube 83 is heated, it is relatively flexible and the concave portions are easily formed by the convex portions.

The present invention is not limited to the above-described embodiments, and other configurations may be adopted. In the following description, the same components as those described above are denoted by the same reference numerals as appropriate, and the description thereof will be omitted.

The number of the 1 st projections 71 and the number of the 2 nd projections 72 are not particularly limited, and may be 2 or less, or 4 or more. The number of 1 st projections 71 and the number of 2 nd projections 72 may be different from each other. Further, only 1 of the 1 st projection 71 and the 2 nd projection 72 or both may be provided. When 1 of the 1 st projection 71 and the 2 nd projection 72 are provided, the 1 st projection 71 and the 2 nd projection 72 may be located at the same position in the extending direction.

The number of the 3 rd convex portions 73 is not particularly limited, and may be 2 or less, or 4 or more. The number of 3 rd convex portions 73 may be different from the number of 1 st convex portions 71 and the number of 2 nd convex portions 72. The 3 rd convex portion 73 may not be connected to the 1 st convex portion 71 and the 2 nd convex portion 72. The 3 rd projection 73 may not be provided.

The cable drawing passage 70a may not be a groove. In this case, the cable drawing passage 70a may be a passage closed all around. The cable drawing passage 70a may be linear or may not be inclined with respect to the radial direction when viewed from the axial direction. The rib 60 may be linear or may not be inclined with respect to the radial direction when viewed from the axial direction. The ribs 60 may not be blade-shaped.

The 1 st and 2 nd

convex portions

71 and 72 may have the structures of the 1 st and 2 nd

convex portions

171 and 172 shown in fig. 7. In the axial direction, the projecting height of the end 171a of the 1 st projection 171 on the 3 rd opening 70d side and the end 172a of the 2 nd projection 172 on the 3 rd opening 70d side becomes smaller from the axial upper side toward the axial lower side. Therefore, when the lead cable 81 is inserted into the cable drawing passage 70a from the 3 rd opening 70d, the lead cable 81 is easily inserted into the cable drawing passage 70 a. This can further prevent the tube 83 from being damaged. Thus, the sealing material 90 can be suppressed from leaking.

The surface of end 171a on the cable drawing passage 70a side and the surface of end 172a on the cable drawing passage 70a side are inclined flat surfaces. The surface of end 171a on the cable drawing passage 70a side and the surface of end 172a on the cable drawing passage 70a side may be curved surfaces. The lower end of the end portion 171a and the lower end of the end portion 172a are located at the same position in the axial direction as the lower end of the cable guide portion 170. Similarly to the configuration shown in fig. 5, the lower end of the end portion 171a and the lower end of the end portion 172a may be disposed apart from the end portion of the cable drawing passage 70a on the 3 rd opening 70d side toward the side opposite to the 3 rd opening 70 d.

The above-described structures can be appropriately combined within a range not inconsistent with each other.

Claims

1. An air supply device includes:

an impeller rotatable about a central axis extending in one direction;

a motor disposed axially below the impeller and configured to rotate the impeller about the central axis;

a circuit board, at least a part of which is axially overlapped with the motor and is electrically connected with the motor;

a lead cable having a lead electrically connected to the circuit board and a tube covering the lead;

a motor support portion which is arranged at the lower side of the motor in the axial direction, has an accommodating portion for accommodating the circuit board, and supports the motor from the lower side of the shaft;

a casing which is disposed radially outward of the motor support portion and circumferentially surrounds the impeller and the motor;

a plurality of ribs connecting the motor support portion and the housing;

a cable guide portion extending from the motor support portion toward the housing along the rib; and

a sealing material covering at least a portion of the circuit board,

it is characterized in that the preparation method is characterized in that,

the cable guide portion has a cable lead-out passage extending along an extending direction in which the cable guide portion extends and opened at both ends of the extending direction of the cable guide portion,

the 1 st opening of the cable outlet passage on the motor support portion side opens into the housing portion,

a 2 nd opening portion on the housing side of the cable drawing path opens to the outside of the housing portion,

the lead cable is drawn out from the inside of the housing portion to the outside of the housing portion via the cable draw-out passage,

the sealing material is disposed inside the housing portion and on the cable lead-out passage,

the cable guide part comprises:

a 1 st projection projecting from an inner side surface on one side in the circumferential direction in the cable lead-out passage and extending in the axial direction; and

a 2 nd projection projecting from an inner side surface on the other side in the circumferential direction in the cable lead-out passage and extending in the axial direction,

the tube has:

a 1 st recessed portion provided on an outer side surface of the pipe, recessed in a circumferential direction, and into which the 1 st raised portion is inserted; and

a 2 nd concave portion provided on an outer side surface of the pipe, recessed in a circumferential direction, and inserted with the 2 nd convex portion,

the 1 st projection is in contact with a portion constituting the 1 st recess in the outer side surface of the tube,

the 2 nd convex part is in contact with a part constituting the 2 nd concave part in the outer side surface of the tube.

2. The air supply arrangement according to claim 1,

the cable guide has the 1 st projection and the 2 nd projection that are different in position from each other in the extending direction.

3. The air supply apparatus according to claim 1 or 2,

the rib and the cable lead-out passage extend in a direction inclined with respect to the radial direction when viewed from the axial direction.

4. The air supply arrangement according to claim 3,

the rib and the cable lead-out passage are curved in the circumferential direction when viewed in the axial direction.

5. The air supply arrangement according to claim 4,

the ribs are in the shape of blades having wind receiving surfaces inclined with respect to the axial direction.

6. The air supply arrangement according to claim 1,

the tube is in contact with inner surfaces of the cable drawing passage on both circumferential sides at positions different from positions where the 1 st projection and the 2 nd projection are arranged.

7. The air supply arrangement according to claim 1,

the cable guide has a plurality of the 1 st projections and a plurality of the 2 nd projections.

8. The air supply arrangement of claim 7,

the number of the 1 st projection and the number of the 2 nd projection are 3 respectively.

9. The air supply arrangement of claim 7,

the tube is in contact with an inner side surface of one circumferential side of the cable lead-out passage between the extending directions of the 1 st projections and in contact with an inner side surface of the other circumferential side of the cable lead-out passage between the extending directions of the 2 nd projections.

10. The air supply arrangement according to claim 1,

the cable guide portion has a 3 rd projecting portion projecting from an inner side surface facing an axially lower side in the cable drawing passage,

the pipe has a 3 rd recessed portion, the 3 rd recessed portion is provided on an outer surface of the pipe, and the 3 rd raised portion is inserted while being recessed toward an axially lower side,

the 3 rd convex portion is in contact with a portion constituting the 3 rd concave portion in the outer side surface of the tube.

11. The air supply arrangement of claim 10,

the 3 rd convex part connects the axial upper end of the 1 st convex part with the axial upper end of the 2 nd convex part.

12. The air supply arrangement of claim 11,

a plurality of connecting projections are provided at intervals in the extending direction, and the connecting projections are formed by connecting the 1 st projection, the 2 nd projection, and the 3 rd projection.

13. The air supply arrangement according to claim 1,

the 2 nd opening is opposed to a radially inner surface of the housing with a gap therebetween.

14. The air supply arrangement according to claim 1,

the dimension of the cable drawing passage in the width direction perpendicular to both the extending direction and the axial direction increases toward both ends of the cable drawing passage in the extending direction.

15. The air supply arrangement according to claim 1,

the cable drawing passage is a groove having a 3 rd opening at an axial lower side.

16. The air supply arrangement of claim 15,

the 1 st projection and the 2 nd projection are arranged apart from the end of the cable drawing passage on the 3 rd opening side in the axial direction toward the upper side in the axial direction.

17. The air supply arrangement of claim 15,

in the axial direction, the projecting height of the end portion on the 3 rd opening portion side of the 1 st convex portion and the end portion on the 3 rd opening portion side of the 2 nd convex portion becomes smaller from the axial upper side toward the axial lower side.

18. The air supply arrangement according to claim 1,

the 1 st projection and the 2 nd projection have curved surfaces.

19. The air supply arrangement according to claim 1,

the motor has:

an annular stator electrically connected to the circuit board; and

a rotor magnet disposed radially outside the stator and fixed to the impeller,

the accommodating part is a cylinder with a bottom part and an opening towards the upper side in the axial direction,

the motor support portion has a stator support portion extending from a center of the bottom surface portion toward an axially upper side,

the stator is fitted and fixed to an outer peripheral surface of the stator support portion.