WO2019054140A1

WO2019054140A1 - Air blower device

Info

Publication number: WO2019054140A1
Application number: PCT/JP2018/030948
Authority: WO
Inventors: 秀岳太田; 広紀長瀬; 英里加池田
Original assignee: 株式会社ミツバ
Priority date: 2017-09-14
Filing date: 2018-08-22
Publication date: 2019-03-21
Also published as: JP2019052576A

Abstract

Provided is an air blower device that is able to efficiently cool the drive source of a fan. The present invention is provided with: a motor having an output shaft; a fan 20 that has a blade 22 and that is rotationally driven by the motor; a shroud 30 that has a cylindrical part 32, an air guiding part 35, and a motor mounting part 60; and a heat insulation plate 80 that is disposed on the side of positive pressure during rotation of the fan 20 relative to the fan 20 and the motor. The heat insulation plate 80 is provided with: a main plate 81 that has a radially inner part 85 overlapping with the motor when viewed in the axial direction and a radially outer part 86 extending from the radially inner part 85 to the radially outer side relative to the cylindrical part 32; and a side wall 82 that extends to the blade 22 side along the axial direction from the side edge of the radially outer part 86 of the side edges of the main plate 81. The side wall 82 is provided with a first side wall 82a that extends from a location, on the side edge of the radially outer part 86, oriented rearward of the rotation direction of the fan 20. A communication part 88 providing communication in the rotation direction of the fan 20 is formed in the first side wall 82a.

Description

Air blower

The present invention relates to a blower.

BACKGROUND Conventionally, there is a blower that cools a vehicle radiator using a cooling fan. In this type of blower, the fan is rotated by the power of the drive source, and the radiator is cooled by, for example, sucking air through the radiator (see, for example, Patent Document 1). Such a blower may be disposed between the radiator and the engine. In this case, as described in Patent Document 1, in order to prevent the drive source from receiving heat from the engine and becoming high temperature, a heat shield plate covering the drive source and blocking the heat from the engine is used. Provided.

JP, 2016-150640, A

However, in order to suppress the drive source from becoming high temperature, it is desirable not only to thermally isolate the drive source from the engine but also to actively cool the drive source.

Therefore, the present invention provides a blower capable of efficiently cooling a drive source of a fan.

The air blower according to the present invention comprises a drive source having an output shaft, a boss portion connected to the output shaft, and a blade projecting outward from the boss portion in the radial direction of the output shaft. A fan rotationally driven by the drive source, a cylindrical portion formed with a fan arrangement hole for arranging the fan, an air guide unit for guiding air sucked by the fan toward the fan arrangement hole, and the output A shroud having a drive source attachment portion provided inside the fan disposition hole and having the drive source attached thereto as viewed from the axial direction of the shaft, and disposed on the positive pressure side when the fan rotates relative to the fan and the drive source A first portion overlapping with the drive source when viewed from the axial direction, and a second portion extending radially outward from the first portion from the first portion 2 copies And the blade extending along the axial direction from the side edge of the second portion among the side edges of the main body portion, the main body portion having a surface intersecting with the axial direction and facing the blade, and A side wall portion extending to the side, and the side wall portion includes a rear side wall portion extending from a portion of the side edge of the second portion facing rearward in the rotational direction of the fan, and the rear side wall portion A communication portion communicating with the rotation direction of the fan is formed.

According to the present invention, the blower includes the shielding member disposed on the positive pressure side of the driving source and the fan during rotation of the fan than the fan, and the shielding member has a first portion overlapping the driving source when viewed from the axial direction. Since the main body is provided, when the engine is disposed on the positive pressure side with respect to the blower, the drive source can be thermally insulated by the first portion of the main body of the shielding member.
Furthermore, the main body portion of the shielding member includes a second portion extending radially outward from the first portion. In addition, the shielding member includes a side wall portion extending to the blade side along the axial direction from the side edge of the second portion among the side edges of the main body portion. Therefore, the air (wind) supplied from the rotating blade is received by the second part of the main body, and the air received by the second part is suppressed by the side wall from flowing out of the space on the blade side with respect to the second part. At the same time, the air received by the second part can be guided by the side wall toward the space on the drive source side with respect to the first part. Thus, air flows between the first portion and the drive source, so that the drive source can be cooled.
Here, the air supplied from the rotating blade flows in a direction inclined with respect to the axial direction. Specifically, the air supplied from the rotating blade flows from the rear to the front in the rotational direction of the fan as it is axially separated from the blade. In the present invention, the rear side wall portion is formed with the communication portion communicating in the rotational direction of the fan. For this reason, the air supplied from the blade flows into the space surrounded by the second portion of the main body and the side wall through the communication portion. Thereby, air can be efficiently flowed toward the first portion as compared with the configuration in which the communication portion is not formed in the rear side wall portion.
By the above, the air blower which can cool the drive source of a fan efficiently can be provided.

In the above-described air blower, the side wall portion includes a front side wall portion extending from a portion of the side edge of the second portion facing forward in the rotational direction of the fan, and the front side wall portion is formed of It is desirable that it is inward from the outside in the radial direction as it goes from the rear to the front in the rotational direction.

According to the present invention, the air flowing from the rear to the front in the rotational direction of the fan can be guided radially inward from the radially outer side while being received by the front side wall portion. Thus, the air received by the second portion can be efficiently guided toward the space on the drive source side with respect to the first portion.

In the above-described air blower, the drive source attachment portion includes an inner cylindrical portion surrounding the periphery of the drive source from the outer side in the radial direction, an outer cylindrical portion surrounding the inner cylindrical portion from the outer side in the radial direction, and the inner side. It is desirable that a plurality of spokes connecting between the cylindrical portion and the outer cylindrical portion and a closed portion close between a pair of spokes adjacent in the circumferential direction of the output shaft.

According to the present invention, the air flow between the inner cylinder and the outer cylinder in the drive source attachment portion is suppressed by the blocking portion to prevent air from flowing between the first portion of the shielding member and the drive source. It can control that the flow of Therefore, reduction in the cooling efficiency of the drive source can be suppressed.

In the above-mentioned air blower, it is desirable for the above-mentioned blockade part to be arranged in the position which does not overlap with the above-mentioned 2nd section seeing from the above-mentioned axial direction.

When the air which has flowed between the first portion and the drive source flows out between the first portion and the drive source, an area where the second portion is not provided around the first portion as viewed from the axial direction Flow out of According to the present invention, it is possible to prevent the air flowing out from between the first portion and the drive source from joining the air flowing between the inner cylindrical portion and the outer cylindrical portion by the blocking portion. Thereby, it can suppress that the flow of air between the 1st portion of a shielding member and a drive source worsens. Therefore, reduction in the cooling efficiency of the drive source can be suppressed.

In the air blower described above, it is preferable that the drive source attachment portion includes an opening communicating with the axial direction at a position overlapping the second portion when viewed from the axial direction.

According to the present invention, the air can be made to flow into the space on the blade side with respect to the second portion of the main body of the shielding member through the opening, so more air is directed to the space on the drive source side with respect to the first portion. It can flow. Therefore, the drive source can be cooled efficiently.

ADVANTAGE OF THE INVENTION According to this invention, the air blower which can cool the drive source of a fan efficiently can be provided.

It is a rear view which shows the air blower of embodiment. It is a perspective view showing a motor and a fan of an embodiment. It is a perspective view showing an air blower of an embodiment. It is a perspective view showing an air blower of an embodiment. It is a rear view which shows the air blower of embodiment. FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5; It is a rear view explaining the effect | action of the air blower of embodiment. It is explanatory drawing of an effect | action of the air blower of embodiment, Comprising: It is a schematic diagram which shows the VIII-VIII cross section of FIG.

Hereinafter, embodiments of the present invention will be described based on the drawings. In the following description, the front, rear, upper, lower, left, and right directions are the same as the front, rear, upper, lower, left, or right directions in the vehicle unless otherwise specified. In the figure, arrow UP is upward, arrow FR is forward (forward in traveling direction), and arrow LH is The left side is shown respectively.

The blower device 1 of the embodiment is mounted, for example, in an engine room of a car and cools a radiator. The radiator is disposed in front of the engine in the engine room, and the blower 1 is attached to the rear of the radiator. Thus, the blower is disposed between the radiator and the engine.

FIG. 1 is a rear view of the blower of the embodiment as viewed from the rear.
As shown in FIG. 1, the blower 1 includes a motor 10 as a drive source, a fan 20 rotationally driven by the motor 10, a shroud 30 forming an outer shell of the blower 1 and fixed to a radiator A heat shield plate 80 (shield member) which thermally isolates heat from the engine 10 and a wire harness 90 connected to the motor 10 are provided. In the following description, the front, rear, upper, lower, left, and right directions are the same as the front, rear, upper, lower, left, or right directions in a state where the shroud 30 is fixed to the radiator (fixed state of the shroud 30).

FIG. 2 is a perspective view showing the motor and the fan of the embodiment.
As shown in FIG. 2, the motor 10 includes a housing 11 for housing a stator and a rotor (not shown), an output shaft 12 (see FIG. 6) protruding from the housing 11, and a plurality (three in this embodiment) extending from the housing 11 And a motor connector 14 fixed to the housing 11. The housing 11 is formed in a cylindrical shape coaxial with the output shaft 12. The output shaft 12 extends in the front-rear direction, and protrudes forward from the housing 11 (see FIG. 6). That is, the axial direction of the output shaft 12 coincides with the front-rear direction. The plurality of fastening portions 13 extend from the outer peripheral surface of the housing 11 along the radial direction of the output shaft 12 (hereinafter simply referred to as the radial direction). The plurality of fastening portions 13 are provided at equal angular intervals in the circumferential direction of the output shaft 12 (hereinafter simply referred to as the circumferential direction). Each fastening portion 13 is formed with an insertion hole through which a screw is inserted. The motor connector 14 is fixed to the rear end of the housing 11. The motor connector 14 protrudes leftward from the circumferential surface of the housing 11.

The fan 20 is an axial fan. The fan 20 is rotationally driven by the motor 10. The fan 20 is driven to suck air through the radiator, and blows the sucked air toward the engine. The fan 20 protrudes radially outward from the outer peripheral surface of the boss portion 21 integrally with the bottomed cylindrical boss portion 21 coupled to the output shaft 12 of the motor 10 so as to allow power transmission and the boss portion 21. A plurality of (in this embodiment, seven) blades 22 and a cylindrical ring member 23 that annularly connects the radially outer end regions of the plurality of blades 22 are provided. The boss portion 21 is provided coaxially with the output shaft 12 of the motor 10. The boss portion 21 opens rearward and accommodates the front end portion of the housing 11 of the motor 10 inside.

Each of the blades 22 is inclined toward the front in the traveling direction of the vehicle as it goes from the rear to the front in the rotational direction of the fan 20 shown by the arrow A in FIG. Therefore, the rear surface of the blade 22 is a positive pressure surface in which the vicinity thereof becomes positive pressure when the fan 20 rotates, and the front surface of the blade 22 is a negative pressure surface in which the vicinity thereof becomes negative pressure when the fan 20 rotates. There is.
The ring member 23 annularly connects a position offset radially inward from the radially outer end of the blade 22. The ring member 23 is provided coaxially with the output shaft 12 of the motor 10.

Drawing 3 and Drawing 4 are perspective views showing an air blower of an embodiment.
As shown in FIGS. 3 and 4, the shroud 30 holds the motor 10 and is provided to cover the fan 20 from the outer peripheral side. The shroud 30 is a resin molded member, and is molded by injection molding using a mold. The shroud 30 is provided in a shroud main body 31 in which a fan disposition hole 33 for disposing the fan 20 is formed, a radiator fixing portion 41 provided in the shroud main body 31 and fixed to a radiator, and the shroud main body 31 The connector holding portion 48 for holding the connector 92, the main rib 50, the reinforcing rib 52 and the side wall rib 54 erected on the shroud main body 31, and the fan arrangement hole 33 seen from the front and rear direction Motor mounting portion 60 (drive source mounting portion) mounted, a plurality of stays 70 connecting the shroud main body 31 and the motor mounting portion 60, and a plurality of heat shield plate mounting seats 72A to which a heat shield plate 80 is mounted 72B and 72C.

As shown in FIG. 3, the shroud main body 31 includes a cylindrical portion 32 (cylindrical portion) and a wind guide portion 35.
The cylindrical portion 32 is formed in a cylindrical shape coaxial with the output shaft 12 (see FIG. 6) of the motor 10. A fan disposition hole 33 is formed inside the cylindrical portion 32. The fan arrangement hole 33 is formed in a circular shape as viewed from the front-rear direction. The cylindrical portion 32 surrounds the plurality of blades 22 of the fan 20.

The air guide 35 guides the air drawn by the fan 20 toward the fan arrangement hole 33. The air guide portion 35 includes a flange portion 36 projecting radially outward from the front end edge of the cylindrical portion 32 and a side wall portion 37 extending forward from the outer edge of the flange portion 36. The flange portion 36 is formed, for example, in a shape corresponding to the shape of the radiator, and faces the radiator in the front-rear direction. As shown in FIG. 1, the upper end edge of the flange portion 36 extends in the left-right direction. The left and right side edges of the flange portion 36 respectively extend vertically downward from the end portion of the upper end edge of the flange portion 36. The lower end edge of the flange portion 36 extends in a circular arc concentric with the output shaft 12 (see FIG. 6) of the motor 10. The connection portion between the lower end edge of the flange portion 36 and the left and right side edges is provided below the central axis of the output shaft 12 of the motor 10 and above the lower end of the cylindrical portion 32.

As shown in FIGS. 3 and 4, the side wall 37 extends from the entire outer periphery of the flange 36. That is, the side wall portion 37 includes an upper side wall portion 37a extending from the upper end edge of the flange portion 36, a left side wall portion 37b extending from the left side edge, a right side wall portion 37c extending from the right side edge, and a lower side wall portion extending from the lower end edge And 37d. The upper side wall 37a, the left side wall 37b, the right side wall 37c, and the lower side wall 37d are continuous with one another.

As shown in FIG. 1, the radiator fixing portion 41 includes an upper fixing portion 42 provided in the upper portion of the shroud main body 31 and

lower fixing portions

43A and 43B provided in the lower portion of the shroud main body 31.

The upper fixed portion 42 is provided in a pair at intervals in the left and right. The upper fixing portion 42 protrudes upward from the flange portion 36. The upper fixing portion 42 is formed in a triangular shape as viewed from the front and rear direction so that the width in the left and right direction becomes smaller as going from the lower side to the upper side. The upper end portion of the upper fixing portion 42 is rounded as viewed in the front-rear direction. The upper fixing portion 42 is formed with insertion holes 42 a through which bolts are respectively inserted.

The

lower fixing portions

43A and 43B are provided at intervals in the left and right. The

lower fixing portions

43A and 43B are a lower left fixing portion 43A provided on the left side and a lower right fixing portion 43B provided on the right side. The

lower fixing portions

43A and 43B are provided with a boss 44 provided at the lower end portion and projecting downward, and a connecting portion 45 for connecting the boss 44 to the lower side wall portion 37d (see FIG. 3) of the air guiding portion 35. .

As shown in FIG. 3, the connection portion 45 of each lower fixed

portion

43A, 43B is formed of a plurality of flat plate-shaped members extending from the lower side wall portion 37d. Specifically, the connecting portion 45 of the lower left fixing portion 43A includes a first member 45a, a second member 45b, a third member 45c, a fourth member 45d, and a fifth member 45e. The first member 45a extends upward from the boss 44 in the vertical direction, and is connected to the lower side wall 37d. The second member 45 b extends rightward and upward from the boss 44 and is connected to the lower end portion of the lower side wall portion 37 d. The third member 45c extends leftward and upward from the boss 44, and is connected to a connection between the lower side wall 37d and the left side wall 37b (see FIG. 4). The fourth member 45 d extends from the middle portion of the first member 45 a to the left and right along the left-right direction. The fourth member 45d is connected to the third member 45c at the left end and connected to the lower side wall 37d at the right end. The fifth member 45 e extends from the middle portion of the third member 45 c to the right along the left-right direction above the fourth member 45 d and is connected to the lower side wall 37 d.

The connecting portion 45 of the right lower fixing portion 43B includes a first member 45f, a second member 45g, a third member 45h, a fourth member 45i, a fifth member 45j, and a sixth member 45k. There is. The first member 45 f extends upward from the boss 44 in the vertical direction, and is connected to the lower side wall 37 d. The second member 45g extends leftward and upward from the boss 44, and is connected to the lower end of the lower side wall 37d. The third member 45h extends rightward and upward from the boss 44, and is connected to the connection between the lower side wall 37d and the right side wall 37c. The fourth member 45i extends from the middle portion of the first member 45f to the left and right along the left-right direction. The fourth member 45i is connected to the third member 45h at the right end and connected to the lower side wall 37d at the left end. The fifth member 45 j extends from the middle portion of the third member 45 h to the left and right along the left-right direction above the fourth member 45 i. The fifth member 45 j is connected to the third member 45 h at the right end, and is connected to the lower side wall 37 d at the left end. The sixth member 45 k extends in the vertical direction from the fourth member 45 i on the left side of the first member 45 f in the vertical direction. The sixth member 45 k is connected to the second member 45 g at the lower end portion, and is connected to the lower side wall portion 37 d at the upper end portion.

As shown in FIG. 4, the connector holding portion 48 is provided on the side surface of the connecting portion 45 of the lower left fixing portion 43A. The connector holding portion 48 is formed in a rectangular box shape. The connector holding portion 48 protrudes radially outward from the third member 45 c of the connecting portion 45 of the lower left fixing portion 43A.

As shown in FIG. 1, a plurality of main ribs 50 are provided. The main rib 50 is erected across the outer peripheral surface of the cylindrical portion 32 and the rear surface of the flange portion 36. The main ribs 50 extend radially from the cylindrical portion 32 in the radial direction. The main rib 50 is provided more than the stay 70.

As shown in FIG. 4, a plurality of (three in the present embodiment) reinforcing ribs 52 are provided for each upper fixing portion 42. The reinforcing rib 52 is erected across the rear surface of the flange portion 36 and the rear surface of the upper fixing portion 42. Each reinforcing rib 52 extends in a straight line. At least one of the reinforcing ribs 52 is continuous with the radially inner end of the main rib 50 at the radially inner end.

The side wall rib 54 is provided upright on the upper side wall 37a. The side wall ribs 54 extend in the left-right direction, and are connected to the left and right ends of each upper fixed portion 42.

FIG. 5 is a rear view showing the blower of the embodiment. Note that FIG. 5 illustrates the heat shield plate 80 in a removed state.
As shown in FIG. 5, the motor attachment portion 60 is formed to surround the motor 10. The motor 10 is fastened and fixed to the motor attachment portion 60. The motor mounting portion 60 includes an inner cylindrical portion 61 surrounding the rear end of the housing 11 of the motor 10 from the outer side in the radial direction, an outer cylindrical portion 62 surrounding the inner cylindrical portion 61 from the outer side in the radial direction, and an inner cylindrical portion 61 A plurality of spokes 63 connecting the outer cylindrical portion 62, a motor mounting seat 64 to which the motor 10 is attached, and a closing portion 67 closing between a pair of spokes 63 adjacent in the circumferential direction are provided.

6 is a cross-sectional view taken along line VI-VI of FIG.
As shown in FIGS. 5 and 6, the inner cylindrical portion 61 is formed in a cylindrical shape coaxial with the output shaft 12 of the motor 10. The inner cylindrical portion 61 surrounds the periphery of the rear end portion of the housing 11 of the motor 10. That is, the inner tubular portion 61 surrounds the housing 11 of the motor 10 at the rear of the boss portion 21 of the fan 20. The inner cylindrical portion 61 is provided with an enlarged diameter portion 61 a at a position overlapping the motor connector 14 of the motor 10 in the circumferential direction so as to avoid the motor connector 14 of the motor 10.

The inner cylindrical portion 61 includes a top wall portion 61 b that covers the entire of the motor 10 in the left-right direction from above. The top wall 61 b is an upper half of the inner cylindrical portion 61. The rear end edge 61 c of the top wall portion 61 b is located rearward (positive pressure side) of the housing 11 of the motor 10. When the rear end 61c of the top wall 61b is positioned rearward of the housing 11 of the motor 10, the rear end 61c of the top wall 61b coincides with the rear end of the housing 11 of the motor 10 in the front-rear direction. Also includes the state. That is, the top wall portion 61 b overlaps the entire rear end of the housing 11 of the motor 10 as viewed in the vertical direction. In the present embodiment, the rear end edge 61 c of the top wall 61 b is formed at a position coincident with the rear end of the housing 11 of the motor 10 in the front-rear direction, and the rear end edge of the lower half of the inner cylindrical portion 61 is the motor 10 It is formed in front of the rear end of the housing 11. The front end edge of the inner cylindrical portion 61 is formed at the same position in the front-rear direction over the entire circumference.

The outer cylindrical portion 62 is formed in a cylindrical shape larger in diameter than the inner cylindrical portion 61 and coaxial with the output shaft 12 of the motor 10. The outer cylindrical portion 62 is arranged with a space in the radial direction with respect to the inner cylindrical portion 61. The front end edge of the outer cylindrical portion 62 is formed at the same position in the front-rear direction as the front end edge of the inner cylindrical portion 61 over the entire circumference. The rear end edge of the outer cylindrical portion 62 is formed at the same position in the front-rear direction as the rear end edge 61 c of the top wall portion 61 b of the inner cylindrical portion 61 over the entire circumference.

As shown in FIG. 5, the plurality of spokes 63 are formed in a plate shape extending in the front-rear direction. The plurality of spokes 63 are connected to the outer peripheral surface of the inner cylindrical portion 61 and the inner peripheral surface of the outer cylindrical portion 62, respectively. The plurality of spokes 63 are arranged such that at least a portion thereof is separated from the adjacent spokes 63 respectively.

As shown in FIG. 6, the front end surface of each spoke 63 is formed at the same position as the front end edge of the inner cylindrical portion 61 and the outer cylindrical portion 62 in the front-rear direction. Of the end faces of the spokes 63 facing the rear, the radially inner end is formed at the same position as the rear end edge of the lower half of the inner cylindrical portion 61 in the front-rear direction. Of the end faces of the respective spokes 63 directed to the rear, the radially outer end is formed at the same position as the rear end edge of the outer cylindrical portion 62 in the front-rear direction. Thus, the spokes 63 are formed such that the dimension in the front-rear direction gradually increases as going from the inner side to the outer side in the radial direction.

As shown in FIG. 5, the motor mounting seats 64 are provided in the same number (three in the present embodiment) as the plurality of fastening portions 13 (see FIG. 2) of the motor 10. Each motor mounting seat 64 is provided at a position corresponding to the plurality of fastening portions 13 of the motor 10. Each motor mounting seat 64 is connected to the inner cylindrical portion 61 and the outer cylindrical portion 62. Each motor mounting seat 64 is formed so as to fill the space between the pair of spokes 63 adjacent in the circumferential direction when viewed from the front-rear direction. The fastening portion 13 of the motor 10 is disposed on the front of each motor mounting seat 64 from the front, and is fastened and fixed by screws.

A plurality of blocking portions 67 are provided. Each closing portion 67 is formed in a flat plate shape extending perpendicularly to the front-rear direction (see FIG. 6). Each closing portion 67 blocks communication in the front-rear direction between a pair of spokes 63 adjacent in the circumferential direction. The location where the blocking portion 67 is provided will be described later.

The plurality of stays 70 radially extend from the outer cylindrical portion 62 of the motor attachment portion 60 along the radial direction. The radially outer end of each stay 70 is continuous with the radially inner end of the main rib 50 of the shroud body 31.

As shown in FIGS. 3 and 4, a plurality of heat shield

plate mounting seats

72A, 72B, 72C are provided on the shroud main body 31 and the motor mounting portion 60. The plurality of heat shield

plate mounting seats

72A, 72B, 72C are a first mounting seat 72A provided on the shroud main body 31, and a second mounting seat 72B and a third mounting seat 72C provided on the motor mounting portion 60. is there. The plurality of heat shield

plate mounting seats

72A, 72B, 72C are formed in a cylindrical shape protruding rearward. The plurality of heat shield

plate mounting seats

72A, 72B, 72C are provided at positions corresponding to heat shield plate fixing portions 83 described later of the heat shield plate 80, respectively.

As shown in FIG. 1, the heat shield plate 80 is disposed so as to cover a part of the fan disposition hole 33 of the shroud main body 31 and at least a part of the motor 10 from the rear. The heat shield plate 80 is formed of, for example, a single metal plate by press molding or the like. Heat shield plate 80 is fixed to main plate 81 (main body) facing fan 20 in the front-rear direction, side wall 82 (side wall) extending forward from a part of the outer edge of main plate 81, and shroud 30 And a heat shield fixing portion 83.

The main plate 81 is formed in a flat plate shape extending perpendicularly to the front-rear direction. On the main plate 81, a front surface 81b (see FIG. 7) which is orthogonal to the front-rear direction and faces the blade 22 of the fan 20 is formed. The main plate 81 has a diameter inner portion 85 (first portion) overlapping with the motor 10 when viewed from the front and rear direction, and a diameter outer portion 86 extending from the diameter inner portion 85 to the outside of the cylindrical portion 32 of the shroud main body 31 along a predetermined radial direction And a second part). The boundary between the radially inner portion 85 and the radially outer portion 86 matches the inner circumferential surface of the inner cylindrical portion 61 of the motor attachment portion 60 as viewed in the front-rear direction. The main plate 81 is provided with a plurality of beads 81 a. The plurality of beads 81 a extend parallel to each other along the predetermined radial direction across the radial inner portion 85 and the radial outer portion 86.

The radial inner portion 85 is formed to cover most of the motor 10 as viewed in the front-rear direction. The radial inside 85 thermally isolates the motor 10 from the engine disposed behind the blower 1. The upper portion of the radial inner portion 85 protrudes to a position radially outward of the inner peripheral surface of the inner cylindrical portion 61 and radially inward of the outer cylindrical portion 62 when viewed in the front-rear direction. The lower right portion of the inner diameter portion 85 is formed to expose the inner side of the inner cylindrical portion 61 when viewed in the front-rear direction.

The radial outer portion 86 blocks the flow of the air sent by the fan 20 in the front-rear direction at a position behind (on the pressure side) the fan 20. The radially outer portion 86 includes both

side edges

86a and 86c extending along the predetermined radial direction, and a leading edge 86b connecting the both

sides

86a and 86c at the tip of the radially outer portion 86. The side edges 86 a and 86 c are a rear edge 86 a facing rearward in the rotational direction of the fan 20 (the direction indicated by arrow A in the drawing) and a front edge 86 c facing forward in the rotational direction of the fan 20. The rear side edge 86 a extends forward in the rotational direction of the fan 20 from the radially inner side toward the outer side. The front edge 86c extends rearward in the rotational direction as it goes from the inner side to the outer side in the radial direction. The leading edge 86 b connects the radially outer end of the rear edge 86 a and the radially outer end of the front edge 86 c. The leading end edge 86 b extends in a direction substantially orthogonal to the predetermined radial direction. The leading edge 86 b is disposed outside the fan disposition hole 33 of the shroud body 31.

As shown in FIGS. 3 and 4, the side wall 82 extends forward from the outer edge of the radial outer portion 86 along the front-rear direction. Thus, the side wall 82 suppresses the wind received by the main plate 81 from flowing out of the space in front of the main plate 81. The side wall 82 includes a first side wall 82a (rear side wall portion) extending from the rear side edge 86a of the radial outer portion 86, a second side wall 82b extending from the entire leading edge 86b of the radial outer side 86, and a front side edge 86c of the radial outer side 86. And a third side wall 82c (front side wall portion) extending from the whole.

The first side wall 82 a extends from a portion of the rear side edge 86 a of the radial outer portion 86 ranging from the radial middle portion to the radial inner end portion. The radially outer end of the first side wall 82 a is provided radially outward of the outer cylindrical portion 62 of the motor attachment portion 60. The second side wall 82b and the third side wall 82c are continuous with each other. The third side wall 82c follows the shape of the front edge 86c of the radial outer portion 86, and proceeds radially inward from the radially outer side as advancing from the rear to the front in the rotational direction of the fan 20.

With such a configuration, the heat shield plate 80 has a portion where the side wall 82 is not provided on the rear side of the main plate 81 in the rotational direction of the fan 20. In other words, the first side wall 82 a is formed with a communicating portion 88 which is a notch and communicates in the rotational direction of the fan 20.

The heat shield plate fixing portion 83 includes a first heat shield plate fixing portion 83 a fixed to the shroud main body 31, a second heat shield plate fixing portion 83 b fixed to the motor mounting portion 60, and a third heat shield plate fixing portion 83 c. And have. The heat shield fixing portion 83 extends from the side edge of the main plate 81 toward the front, and then protrudes outward in the radial direction. The heat shield plate fixing portion 83 is formed with an insertion hole through which a screw is inserted. The first heat shield plate fixing portion 83 a is provided at the radially outer end of the radial outer portion 86. A portion of the first heat shield plate fixing portion 83a is shared with the second side wall 82b. The first heat shield plate fixing portion 83 a is fastened and fixed to a first mounting seat 72 </ b> A provided on the shroud main body 31. The second heat shield plate fixing portion 83 b is provided at an end of the heat shield plate 80 opposite to the first heat shield plate fixing portion 83 a. The second heat shield plate fixing portion 83 b is a motor attachment portion 60. It is fastened and fixed to the 2nd attachment seat 72B provided in. The third heat shield plate fixing portion 83 c is provided at the radially inner end portion of the radial outside 86. A part of the third heat shield plate fixing portion 83c is shared with the first side wall 82a. The third heat shield plate fixing portion 83 c is fastened and fixed to a third mounting seat 72 </ b> C provided in the motor mounting portion 60.

As shown in FIG. 5, in the wire harness 90, the connector 91 at one end is connected to the motor connector 14 of the motor 10, and the connector 92 at the other end is held by the connector holding portion 48 (see FIG. 4). The wire harness 90 is disposed between the inner cylindrical portion 61 and the outer cylindrical portion 62 of the motor mounting portion 60 in order from one end to the other end, and then the heat shield plate 80 (see FIG. It extends radially outward while being held by a stay 70 provided at a position overlapping with 1).

Here, the position of the closed portion 67 of the motor attachment portion 60 will be described in detail.
As shown in FIGS. 1 and 5, the blocking portion 67 is provided at a position not overlapping the outer diameter 86 of the main plate 81 of the heat shield plate 80 when viewed from the front-rear direction. That is, the blocking portion 67 is not provided at a position overlapping the diameter outer portion 86 of the main plate 81 of the heat shield plate 80 when viewed from the front-rear direction. Thus, the motor mounting portion 60 is provided with an opening 65 communicating in the front-rear direction at a position overlapping the outer diameter 86 of the main plate 81 of the heat shield plate 80 when viewed from the front-rear direction. The opening 65 is a portion sandwiched by the spokes 63 adjacent in the circumferential direction.

Next, the operation of the air blower 1 of the present embodiment will be described.
The blower 1 includes a heat shield plate 80 disposed rearward of the motor 10 and the fan 20. The heat shield plate 80 includes the main plate 81 having the inner diameter 85 overlapping the motor 10 when viewed from the front-rear direction. Therefore, when the engine is disposed at the rear with respect to the blower 1, the heat shield plate 80 The motor 10 can be thermally insulated by the radial inside 85.

FIG. 7 is a rear view illustrating the operation of the blower of the embodiment. In FIG. 7, the heat shield plate 80 is indicated by an imaginary line.
As shown in FIG. 7, in the blower 1, when the fan 20 is rotated, the wind flows from the front toward the rear inside the fan disposition hole 33. The main plate 81 of the heat shield plate 80 includes a radially outer portion 86 extending radially outward from the radially inner portion 85. Further, the heat shield plate 80 is provided with a side wall 82 extending to the blade 22 side (forward) along the front-rear direction from the side edge of the diameter outer portion 86 among the side edges of the main plate 81. Therefore, the air (wind) supplied from the rotating blade 22 is received by the outer diameter 86 of the main plate 81, and the air received by the outer diameter 86 is discharged from the space on the blade 22 side with respect to the outer diameter 86. Thus, the air received by the outside of the diameter 86 can be guided by the side wall 82 toward the space on the motor 10 side (forward) with respect to the inside of the diameter 85 while being suppressed. As a result, air flows between the inner diameter 85 and the motor 10, so that the motor 10 can be cooled.

FIG. 8 is an explanatory view of the operation of the air blower of the embodiment, and is a schematic view showing a VIII-VIII cross section of FIG.
Here, as shown in FIG. 8, the air supplied from the rotating blade 22 flows along a direction inclined with respect to the front-rear direction. Specifically, the air supplied from the rotating blade 22 is directed from the rear to the front in the rotational direction of the fan 20 (the direction indicated by the arrow A in the figure) as being separated from the blade 22 along the front-rear direction Flow. In the present embodiment, a communication portion 88 communicating with the rotation direction of the fan 20 is formed on the first side wall 82a. Therefore, the air supplied from the blade 22 flows into the space surrounded by the main plate 81 and the side wall 82 through the communication portion 88. Thus, air can flow efficiently toward the inner diameter 85 as compared with the configuration in which the communication portion is not formed on the first side wall.
By the above, the air blower 1 which can cool the motor 10 efficiently can be provided.

Further, the third side wall 82c is directed radially inward from the radially outer side as advancing from the rear in the rotational direction of the fan 20 to the front. According to this configuration, the air flowing from the rear to the front in the rotational direction of the fan 20 can be guided radially inward from the radially outer side while being received by the third side wall 82c. Thus, the air received by the outer diameter 86 can be efficiently guided toward the space on the motor 10 side with respect to the inner diameter 85.

Further, the motor attachment portion 60 includes a plurality of spokes 63 connecting between the inner cylindrical portion 61 and the outer cylindrical portion 62, and a closing portion 67 closing the pair of spokes 63 adjacent in the circumferential direction. . According to this configuration, the blocking portion 67 suppresses the flow of air through the space between the inner cylindrical portion 61 and the outer cylindrical portion 62 in the motor attachment portion 60, and the inner diameter 85 of the heat shield plate 80 and the motor 10 It can control that the flow of the air between and is disturbed. Therefore, it can suppress that the cooling efficiency of the motor 10 falls.

In addition, the blocking portion 67 is disposed at a position not overlapping the diameter outer portion 86 when viewed in the front-rear direction. According to this configuration, when the air flowing between the inner diameter 85 and the motor 10 flows out from between the inner diameter 85 and the motor 10, the outer diameter 86 of the periphery of the inner diameter 85 when viewed from the front-rear direction Flow out of areas not provided. According to the present embodiment, it is possible to prevent the air flowing out from between the radial inner portion 85 and the motor 10 from joining the air flowing between the inner cylindrical portion 61 and the outer cylindrical portion 62 by the blocking portion 67. Thereby, it can suppress that the flow of the air between diameter inside 85 of heat shield plate 80 and motor 10 worsens. Therefore, it can suppress that the cooling efficiency of the motor 10 falls.

Further, the motor attachment portion 60 includes an opening 65 communicating in the front-rear direction at a position overlapping the outer diameter 86 when viewed from the front-rear direction. According to this configuration, the air can be made to flow into the space on the blade 22 side with respect to the diameter outer portion 86 of the main plate 81 of the heat shield plate 80 through the opening 65. More air can flow. Therefore, the motor 10 can be cooled efficiently.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope.
For example, although the blower is used for cooling the radiator in the above embodiment, the blower according to the present invention is not limited to the radiator cooling, and may be for cooling other devices. .

Moreover, in the said embodiment, although the communication part 88 formed in the 1st side wall 82a is a notch, it is not limited to this, A through-hole formed in the 1st side wall may be sufficient as a communication part.
Moreover, in the said embodiment, although the front surface 81b orthogonal to the front-back direction is formed in the main plate 81 of the heat insulation board 80, it is not limited to this. It is sufficient that the main plate of the heat shield plate is formed with a surface that intersects in the front-rear direction and faces the blade 22 of the fan 20 and can receive the air supplied from the fan 20.

In addition, without departing from the spirit of the present invention, it is possible to replace components in the above-described embodiment with known components as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Air blower 10 ... Motor (drive source) 12 ... Output shaft 20 ... Fan 21 ... Boss part 22 ... Blade 30 ... Shroud 32 ... Cylindrical part (tube part) 35 ... Air guide part 33 ... Fan arrangement hole 60 ... Motor attachment Parts (Drive source attachment part) 61 ... Inner cylindrical part 61b ... Top wall part 62 ... Outer cylindrical part 63 ... Spokes 65 ... Opening part 67 ... Blocked part 80 ... Heat shield plate (Shielding member) 81 ... Main plate (Main part) 82 side wall (side wall portion) 82a first side wall (rear side wall portion) 82 c third side wall (front side wall portion) 85 diameter inside (first portion) 86 diameter outside (second portion) 88 communication portion

Claims

A drive source having an output shaft;
A fan having a boss portion connected to the output shaft, and a blade projecting outward from the boss portion in the radial direction of the output shaft, the fan being rotationally driven by the drive source;
The cylinder portion in which the fan arrangement hole for arranging the fan is formed, the air guide portion which guides the air taken in by the fan toward the fan arrangement hole, and the fan arrangement hole viewed from the axial direction of the output shaft A shroud having a drive source attachment portion provided inside the drive source and having the drive source attached thereto;
A shielding member disposed closer to the positive pressure side of the fan when the fan rotates than the fan and the drive source;
Equipped with
The shielding member is
A first portion overlapping with the drive source when viewed from the axial direction, and a second portion extending outward from the first portion in the radial direction from the first portion, and intersect the axial direction and also intersect the axial direction A body portion having a surface facing the blade;
Among the side edges of the main body portion, a side wall portion extending from the side edge of the second portion along the axial direction to the blade side;
Equipped with
The side wall portion includes a rear side wall portion extending from a portion of the side edge of the second portion facing rearward in the rotational direction of the fan,
The rear side wall portion is formed with a communicating portion communicating in the rotational direction of the fan.
A blower characterized in that.
The side wall portion includes a front side wall portion extending from a forward facing position in a rotational direction of the fan at a side edge of the second portion,
The front side wall portion is directed inward from the radially outer side as advancing from the rear to the front in the rotational direction of the fan.
The air blower according to claim 1, characterized in that:
The drive source attachment portion is
An inner cylindrical portion surrounding the periphery of the drive source from the outer side in the radial direction;
An outer cylindrical portion surrounding the inner cylindrical portion from the outer side in the radial direction;
A plurality of spokes connecting the inner cylindrical portion and the outer cylindrical portion;
A closed portion closing between a pair of spokes adjacent in the circumferential direction of the output shaft;
Equipped with
The air blower according to claim 1 or 2, characterized in that:
The blocking portion is disposed at a position not overlapping the second portion when viewed in the axial direction.
The air blower according to claim 3, characterized in that:
The drive source attachment portion includes an opening communicating with the axial direction at a position overlapping the second portion when viewed from the axial direction.
The air blower according to claim 3 or 4 characterized by things.