JP2020133457A - Air blower - Google Patents

Abstract

To provide an inexpensive air blower capable of being prevented from being damaged while reducing its size and noise.SOLUTION: An air blower comprises a fan 1 rotating around a rotational axis along a traveling direction, and a fan shroud 2 capable of supporting the fan 1 rotatably around the rotational axis. The fan 1 comprises: a fan body 3 located on the rotational axis; a plurality of fan blades 4 extending from the outer peripheral surface of the fan body 3 along a radial direction, and arranged side by side in a circumferential direction; and a connecting ring 5 connecting the outer sides of the plurality of fan blades 4 in the radial direction. The fan shroud 2 has a stopper 20 that is arranged so as to face a heat exchanger 120 side of the connecting ring 5 in a direction of the rotational axis and restricts the displacement of the connecting ring 5 toward the heat exchanger 120 side.SELECTED DRAWING: Figure 4

Description

The present invention relates to a blower.

For example, a blower is provided behind the heat exchanger in the traveling direction for cooling a heat exchanger such as a radiator mounted on a vehicle. The blower comprises a motor, a fan attached to the motor, and a fan shroud that covers the perimeter of the fan. The fan includes a fan body attached to the rotating shaft of the motor, and a plurality of fan blades arranged radially from the outer peripheral surface of the fan body. The fan shroud is fixed to the vehicle body. The motor is fixed to the fan shroud.
Under such a configuration, when the fan rotates, air is drawn from the front of the heat exchanger in the traveling direction by the fan blades, and the wind passes through the heat exchanger and the fan in this order. By passing air through the heat exchanger in this way, cooling of the heat exchanger is promoted.

Japanese Patent No. 4534180 Japanese Unexamined Patent Publication No. 2010-25026 Japanese Patent No. 5364437

By the way, the blower may be bent and deformed under the influence of the wind. For example, if a fan blade that is particularly liable to bend and deform bends, the fan blade may come into contact with the heat exchanger, which may damage the heat exchanger and the blower. If, for example, the wall thickness of each part is increased in order to prevent the blower from bending and deforming, the size of the blower may increase and the noise during driving due to the increase in size may increase. In addition, there is a possibility that the manufacturing cost will increase due to the increase in size of the blower.

Therefore, the present invention provides an inexpensive blower that can prevent damage to the device while reducing the size and noise.

In order to solve the above problems, the blower device according to the present invention rotates around the rotation axis and blows wind from the first direction of the rotation axis toward the second direction opposite to the first direction. A fan to be generated and a fan shroud capable of rotatably supporting the fan around the rotation axis are provided, and the fan rotates from a fan body located on the rotation axis and an outer peripheral surface of the fan body. A plurality of fan blades extending along a radial direction orthogonal to the axis and arranged side by side in the circumferential direction around the rotation axis, and a connecting ring connecting the outer sides of the plurality of fan blades in the radial direction. The fan shroud is characterized by having a stopper that is arranged to face the connecting ring in the first direction of the connecting ring and regulates the displacement of the connecting ring in the first direction.

In the blower device according to the present invention, the fan shroud is arranged in a ring portion that surrounds the fan around the rotation axis and a fan support that is arranged at the center of the ring portion in the radial direction to support the fan. The fan is provided with a table and a shroud wall surface extending outward from the ring portion in the radial direction, and is provided on the surface of the fan support table in the second direction and protrudes toward the second direction. It is characterized by having a motor to which the main body is attached.

In the blower device according to the present invention, the connecting ring is arranged at the outermost end in the radial direction of the fan blade, and the connecting ring is stretched from the end in the second direction to the outside in the radial direction. The ring portion has an outer flange portion to be exposed, and the ring portion faces the outer flange portion in the direction of the rotation axis and functions as the stopper.

In the blower device according to the present invention, when the length of the connecting ring in the direction of the rotating axis is L1 and the length of the ring portion in the direction of the rotating axis is L2, the connecting ring and the ring portion are , L1 and L2 are formed so as to satisfy L1 / 2≤L2≤L1 / 3.

The blower according to the present invention includes a plurality of stays provided on the front surface of the shroud wall surface in the first direction and straddling the fan support base and the shroud wall surface, and the outer flange portion and the outer flange portion in the direction of the rotation axis. When the distance between the ring portion is L3 and the distance between the connecting ring and the stay in the direction of the rotation axis is L4, the outer flange portion, the ring portion and the stay are at a distance L3. It is characterized in that L4 is formed so as to satisfy L3 <L4.

The blower according to the present invention is characterized in that the outer flange portion, the ring portion, and the stay are formed so that the distance L4 satisfies L4 ≧ L1 / 2.

The blower according to the present invention includes a fan that rotates around a rotation axis and generates wind from a first direction of the rotation axis toward a second direction opposite to the first direction, and the fan. A fan shroud that can be rotatably supported around the rotation axis is provided, and the fan shroud has a ring portion that surrounds the fan around the rotation axis and a diameter of the ring portion that is orthogonal to the rotation axis. A fan support base arranged in the center of the direction for supporting the fan, a shroud wall surface extending outward from the ring portion in the radial direction, and the fan support base provided on the front surface of the shroud wall surface in the first direction. A plurality of stays straddling the shroud wall surface and the front surface of the shroud wall surface are formed so as to project in the first direction, and the shroud wall surface is formed from the vicinity of the outer peripheral portion of the ring portion along the radial direction. A plurality of ribs extending to the vicinity of the outer peripheral edge and arranged side by side in the circumferential direction around the rotation axis are provided, and a plurality of ribs adjacent to each other in the circumferential direction are defined as θ. The rib is formed so as to satisfy 20 ° ≦ θ ≦ 25 °.

The blower according to the present invention is characterized in that the stay extends from the outer peripheral surface of the fan support base to the outer peripheral surface of the shroud wall surface.

According to the present invention, the wind device can be miniaturized, noise during driving can be reduced, and damage to the blower and heat exchanger can be prevented. Further, the manufacturing cost can be reduced by downsizing the blower.

The perspective view which illustrates the vehicle of the automobile in embodiment of this invention. A side view of a heat exchanger and a blower according to an embodiment of the present invention. The plan view which saw the blower device in embodiment of this invention from the rear. FIG. 3 is a cross-sectional view taken along the line AA of FIG. The plan view which shows the state which removed the fan of FIG. The plan view which saw the blower device in embodiment of this invention from the front.

Next, an embodiment of the present invention will be described with reference to the drawings.

(Vehicle and blower)
FIG. 1 is a perspective view illustrating a vehicle 100 of an automobile equipped with a blower 110. FIG. 2 is a side view of the heat exchanger (radiator) 120 and the blower 110. In FIG. 1, the heat exchanger 120 is not shown for the sake of clarity.
As shown in FIGS. 1 and 2, the blower 110 is used to cool the heat exchanger 120 and the like of the vehicle 100. In the following description, the vehicle 100 is simply forward in the traveling direction (corresponding to the first direction in the claims), simply rearward in the traveling direction (corresponding to the second direction in the claims), and simply upward in the gravity direction. , The lower part in the direction of gravity is simply referred to as the lower part. In the following description, it is assumed that the front, rear, upper, and lower directions of the blower 110 refer to the directions in which the blower 110 is attached to the vehicle 100. Further, when facing forward, the right side is simply called the right side, and the left side is simply called the left side. FIG. 2 is a side view of the heat exchanger 120 and the blower 110 as viewed from the left side of the vehicle.

In the vehicle 100, the engine 105 is mounted in the engine room 101 in front of the vehicle interior, and the heat exchanger 120 is mounted in front of the engine 105. A blower 110 is provided to circulate the forced cooling air to the heat exchanger 120 so as to face the ventilation surface (rear surface) of the radiator. For example, two blower devices 110 are arranged side by side in the vehicle width direction of the vehicle 100. Since these blower devices 110 have the same configuration, in the following description, only one of the two blower devices 110 will be described, and the description of the other will be omitted.

(Blower)
The blower 110 forms a motor 111 as a drive source, a fan 1 rotationally driven by the motor 111, and an outer shell of the blower 110, and is fixed to the engine room 101 of the vehicle 100, the heat exchanger 120, or the like. It is equipped with a shroud 2. As the motor 111, for example, a brushed DC motor is used. The motor 111 has a rotor 112. The rotation shaft 113 of the rotor 112 projects rearward (see also FIG. 5). A fan 1 is attached to the rotating shaft 113 of the rotor 112.
In the following description, the direction of the rotation axis C of the motor 111 (rotation axis 113) is simply referred to as an axial direction, the rotation direction of the motor 111 is referred to as a circumferential direction, the rotation axis C, and the direction orthogonal to the circumferential direction is referred to as a radial direction. ..

(fan)
FIG. 3 is a plan view of the blower 110 as viewed from the rear.
As shown in FIG. 3, the fan 1 is a so-called axial fan. The fan 1 is rotated by the motor 111 so as to suck air from the front through the heat exchanger 120. The fan 1 has a substantially bottomed tubular fan body 3 located coaxially with the rotation axis C. The fan main body 3 is attached to the tip end (rear end) of the rotating shaft 113 with the opening 3a facing the heat exchanger 120 side (front, first direction). The motor 111 is housed in the fan body 3.

A plurality of fan blades 4 extending outward in the radial direction are integrally molded on the outer peripheral surface of the fan body 3. The fan blades 4 are arranged radially so as to be evenly spaced in the circumferential direction.
The radial outer ends of each fan blade 4 are connected via a substantially cylindrical connecting ring 5. The connecting ring 5 constitutes the outer peripheral portion of the fan 1.

FIG. 4 is a cross-sectional view taken along the line AA of FIG.
The connecting ring 5 is integrally formed with an outer flange portion 6 projecting outward in the radial direction at a rear end (second direction) opposite to the heat exchanger 120.

(Fan shroud)
FIG. 5 is a plan view showing a state in which the fan 1 of FIG. 3 is removed. FIG. 6 is a plan view of the blower 110 as viewed from the front.
As shown in FIGS. 3 to 6, the fan shroud 2 has a substantially cylindrical ring portion (mouse) 7 surrounding the periphery of the connecting ring 5 of the fan 1 and a substantially circular circle arranged in the radial center of the ring portion 7. The main configuration is a plate-shaped fan support base 8 and a shroud wall surface (general surface) 9 extending radially outward from the outer peripheral surface of the ring portion 7.

The ring portion 7 is arranged coaxially with the rotation axis C. Further, the ring portion 7 is arranged at a position where it overlaps with the connecting ring 5 of the fan 1 in the radial direction. Further, the ring portion 7 is arranged at a position facing the outer flange portion 6 of the fan 1 in the axial direction. That is, the outer flange portion 6 of the fan 1 is located behind the ring portion 7 on the opposite side of the heat exchanger 120. An inner flange portion 10 projecting inward in the radial direction is integrally formed at the rear end of the ring portion 7. The inner flange portion 10 and the outer flange portion 6 of the fan 1 are opposed to each other in the axial direction. Further, the connecting ring 5 of the fan 1 is located radially inside the inner peripheral edge of the inner flange portion 10.

The shroud wall surface 9 has a curved connecting portion 11 that gradually expands outward in the radial direction from the front end of the ring portion 7 toward the front, and a curved connecting portion 11 that gradually expands from the end opposite to the ring portion 7 of the curved connecting portion 11 toward the front. The inclined surface 12 extending linearly outward in the direction and the rising portion 13 bent and extended along the axial direction from the end opposite to the curved connecting portion 11 of the inclined surface 12 are integrally molded.

The inclined surface 12 is formed in a substantially rectangular shape whose outer shape is long in the left-right direction when viewed from the axial direction. That is, the inclined surface 12 forms four downward inclined surfaces 14 from the curved connecting portion 11 toward the two long sides 12a and the two short sides 12b. At the connecting portion of each downward slope surface 14, four ridge lines 15 are formed on the rear surface 12c on the rear side. Further, the rising portion 13 is also formed in a substantially rectangular frame shape that is long in the left-right direction when viewed from the axial direction so as to correspond to the outer shape of the inclined surface 12.

As will be shown in detail in FIG. 6, a plurality of ribs 16 are formed so as to project forward on the front surface 12d on the front side of the inclined surface 12 (downward inclined surface 14). Each rib 16 extends along the radial direction over the entire inclined surface 12. That is, the rib 16 extends from the vicinity of the outer peripheral portion of the ring portion 7 to the vicinity of the rising portion 13 forming the outer peripheral edge of the shroud wall surface 9. Further, the ribs 16 are arranged at equal intervals in the circumferential direction and are arranged radially when viewed from the axial direction. When the distance between the ribs 16 adjacent to each other in the circumferential direction is θ, the ribs 16 are formed.
20 ° ≤ θ ≤ 25 ° ・ ・ ・ (1)
It is formed to satisfy.
The interval θ is an angle between straight lines along the radial direction. Since each rib 16 is formed along the radial direction, the angle between the ribs 16 adjacent to each other in the circumferential direction is the interval θ.

The fan support base 8 is arranged at substantially the same position as the rising portion 13 in the axial direction. The outer diameter D1 of the fan support base 8 is sufficiently smaller than the inner diameter D2 of the ring portion 7. The fan support base 8 is supported by the shroud wall surface 9 via a plurality of stays 17 straddling the fan support base 8 and the shroud wall surface 9.

More specifically, the stay 17 has a stay main body 18 extending along the radial direction from the outer peripheral surface of the fan support base 8 to the inner peripheral surface of the ring portion 7 when viewed from the axial direction, and the diameter of the stay main body 18. A reinforcing stay 19 extending along the extending direction of the stay body 18 from the outer end in the direction to the rising portion 13 (the outer peripheral surface of the shroud wall surface 9) is integrally molded. The reinforcing stay 19 is connected to the front surface 12d of the inclined surface 12. The plurality of stays 17 are arranged radially when viewed from the axial direction. The motor 111 is fixed to the rear surface 8a on the rear side of the fan support base 8 supported by such a stay 17.

Here, as shown in FIG. 4, when the axial length of the connecting ring 5 is L1 and the axial length of the ring portion 7 is L2, the connecting ring 5 has lengths L1 and L2 of L1. / 2 ≤ L2 ≤ L1 / 3 ... (2)
It is formed to satisfy.

Further, when the distance between the outer flange portion 6 and the ring portion 7 in the axial direction is L3 and the distance between the connecting ring 5 and the stay 17 in the axial direction is L4, the outer flange portion 6 and the ring portion 7 The distances L3 and L4 are L3 <L4 ... (3)
It is formed to satisfy.
Further, the outer flange portion 6 and the ring portion 7 have a distance L4 of L4 ≧ L1 / 2 ... (4).
It is formed to satisfy.

(Action of blower)
Next, the operation of the blower 110 will be described.
By driving the motor 111, the fan 1 rotates via the rotating shaft 113. Then, air is drawn in from the front of the heat exchanger 120, and the wind passes in the order of the heat exchanger 120 and the fan 1. More specifically, the wind is drawn into the ring portion 7 along the front surface 12d of the inclined surface 12 in the fan shroud 2. After that, the wind flows backward through the fan 1. By passing air through the heat exchanger 120 in this way, cooling of the heat exchanger 120 is promoted.

Here, a plurality of ribs 16 are formed on the front surface 12d of the inclined surface 12. These ribs 16 increase the mechanical strength of the fan shroud 2. In addition to this, the ribs 16 adjacent to each other in the circumferential direction are formed so that the interval θ satisfies the above equation (1). Therefore, a plurality of small air vortices are generated between the ribs 16 adjacent to each other in the circumferential direction. This vortex facilitates the flow of wind on the front surface 12d of the inclined surface 12. Further, the fan blade 4 of the fan 1 is provided with a substantially cylindrical connecting ring 5 at the outer end in the radial direction. Therefore, the connecting ring 5 serves as a guide and air is efficiently taken into the fan 1.

In addition to this, the connecting ring 5 and the ring portion 7 of the fan shroud 2 are arranged at overlapping positions in the radial direction. Since the ring portion 7 of the connecting ring 5 and the fan shroud 2 is formed so that the distance L4 between the connecting ring 5 and the stay 17 in the axial direction satisfies the above equation (4), the connecting ring 5 and the ring portion 7 are formed. 7 and 7 are surely overlapped in the radial direction. Therefore, air is surely taken into the fan 1.
Here, the connecting ring 5 and the ring portion 7 are formed so that the axial length L1 of the connecting ring 5 and the axial length L2 of the ring portion 7 satisfy the above equation (2). Therefore, it is possible to prevent an extra load from being applied to the blower 110 while ensuring the air volume of the blower 110.

When the wind flows through the fan 1 from the front to the rear, the fan 1 receives a reaction force toward the front. Therefore, the fan blade 4 tends to bend and deform in the radial direction toward the front with the root on the fan body 3 side as a fulcrum (see arrow Y1 in FIG. 4).
Here, the outer flange portion 6 is integrally molded with the connecting ring 5 provided on the fan blade 4. The outer flange portion 6 is arranged to face the ring portion 7 (inner flange portion 10) of the fan shroud 2 in the axial direction. Therefore, when the fan blade 4 tries to bend and deform, the outer flange portion 6 of the connecting ring 5 comes into contact with the ring portion 7 of the fan shroud 2. That is, the ring portion 7 functions as a stopper 20 that regulates the forward displacement of the connecting ring 5. As a result, the bending deformation of the fan blade 4 is suppressed. Moreover, in the outer flange portion 6 and the ring portion 7, the distance L3 between the outer flange portion 6 and the ring portion 7 in the axial direction and the distance L4 between the connecting ring 5 and the stay 17 in the axial direction are as described above. It is formed so as to satisfy the equation (3). Therefore, it is possible to prevent the connecting ring 5 and the stay 17 from coming into contact with each other before the connecting ring 5 and the ring portion 7 come into contact with each other.

As described above, in the above-described embodiment, the substantially cylindrical connecting ring 5 is provided at the radial outer end of the fan blade 4. On the other hand, the fan shroud 2 is provided with a ring portion 7 (stopper 20) that regulates the displacement of the connecting ring 5 to the front (heat exchanger 120 side). Therefore, the displacement of the connecting ring 5 can be regulated by the ring portion 7 without thickening the fan blade 4 which is particularly easily bent and deformed. As a result, the bending deformation of the fan blade 4 can be suppressed, and the contact between the heat exchanger 120 and the fan blade 4 can be reliably prevented. Therefore, it is possible to prevent damage to the blower 110 and the heat exchanger 120 while reducing the size and cost of the blower 110. Further, the noise during driving can be suppressed by downsizing the blower 110.

Moreover, in the outer flange portion 6 and the ring portion 7, the distance L3 between the outer flange portion 6 and the ring portion 7 in the axial direction and the distance L4 between the connecting ring 5 and the stay 17 in the axial direction are as described above. It is formed so as to satisfy (3). Therefore, it is possible to prevent the connecting ring 5 and the stay 17 from coming into contact with each other before the connecting ring 5 and the ring portion 7 come into contact with each other.

Further, in the blower device 110, the motor 111 is arranged on the rear surface 8a of the fan support base 8. The rotating shaft 113 of the motor 111 is projected rearward, and the fan main body 3 is attached to the protruding portion. The motor 111 is housed in the fan body 3. In this way, the shaft length of the blower 110 can be shortened by effectively utilizing the inside of the fan body 3. Therefore, the blower 110 can be miniaturized, and noise during driving can be suppressed.
Further, when the fan 1 and the motor 111 are arranged as described above, as a result, the fan shroud 2 is located on the heat exchanger 120 side of the fan blade 4. However, since the bending deformation of the fan blade 4 is suppressed as described above, damage to the blower 110 and the heat exchanger 120 can be prevented.

Further, a plurality of ribs 16 are formed on the front surface 12d of the inclined surface 12 in the fan shroud 2. These ribs 16 can increase the mechanical strength of the fan shroud 2. In addition to this, the ribs 16 are formed so that the distance K between the ribs 16 adjacent to each other in the circumferential direction satisfies the above formula (1). Therefore, the wind easily flows on the front surface 12d of the inclined surface 12, the driving efficiency of the blower 110 can be improved, and the noise at the time of driving the blower 110 can be reliably suppressed.

Further, the fan blade 4 of the fan 1 is provided with a substantially cylindrical connecting ring 5 at the outer end in the radial direction. Therefore, the connecting ring 5 serves as a guide and air is efficiently taken into the fan 1. Therefore, the air volume of the blower 110 can be reliably secured. Further, if attention is paid only from the viewpoint of the air volume of the blower 110, even if the ring portion 7 is abolished, it is possible to secure a sufficient air volume by the connecting ring 5.

Further, the connecting ring 5 and the ring portion 7 of the fan shroud 2 are arranged at overlapping positions in the radial direction. Since the connecting ring 5 and the stay 17 are formed so that the distance L4 between the connecting ring 5 and the stay 17 in the axial direction satisfies the above equation (4), the connecting ring 5 and the ring portion 7 are formed in the radial direction. Will surely overlap. Since the connecting ring 5 and the ring portion 7 surely overlap each other in the radial direction, air can be surely taken into the fan 1. Moreover, the connecting ring 5 and the ring portion 7 are formed so that the axial length L1 of the connecting ring 5 and the axial length L2 of the ring portion 7 satisfy the above equation (2). Therefore, it is possible to prevent an extra load from being applied to the blower 110 while ensuring the air volume of the blower 110.

Further, the stay 17 is composed of a stay main body 18 and a reinforcing stay 19. The reinforcing stay 19 can more reliably increase the mechanical strength of the shroud wall surface 9. Therefore, the blower 110 can be made smaller more reliably.

The present invention is not limited to the above-described embodiment, and includes various modifications of the above-described embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the blower 110 is used for cooling the heat exchanger 120 and the like of the vehicle 100 has been described. However, the present invention is not limited to this, and the blower 110 can be used as various cooling devices.

Further, in the above-described embodiment, the case where the motor 111 is fixed to the rear surface 8a of the fan support base 8 and the rotating shaft 113 of the motor 111 is projected rearward has been described. Then, the case where the fan main body 3 is attached to the protruding portion has been described. However, the present invention is not limited to this, and the motor 111 may be fixed to the front surface in front of the fan support base 8 and the rotating shaft 113 may be projected forward. Then, the fan main body 3 may be attached to the protruding portion.

Further, in the above-described embodiment, the case where the ring portion 7 of the fan shroud 2 is made to function as the stopper 20 for restricting the forward displacement of the connecting ring 5 has been described. However, the present invention is not limited to this, and the fan shroud 2 may be provided with a stopper 20 separately. Further, the stopper 20 does not have to be cylindrical, as long as the displacement of the connecting ring 5 to the front can be regulated. For example, a plurality of protrusions may be arranged in the circumferential direction, and these protrusions may be used as the stopper 20.

Further, in the above-described embodiment, the case where the connecting ring 5 is provided at the radial outer end of the fan blade 4 has been described. However, the present invention is not limited to this, and the connecting ring 5 may be provided at an arbitrary position in the radial direction of the fan blade 4. The stopper 20 may be arranged on the connecting ring 5 according to the position.

1 ... Fan, 2 ... Fan shroud, 3 ... Fan body, 4 ... Fan blade, 5 ... Connecting ring, 6 ... Outer flange part, 7 ... Ring part, 8 ... Fan support base, 8a ... Rear surface (face), 9 ... Shroud wall surface, 12 ... inclined surface, 12d ... front surface, 13 ... rising part (outer peripheral surface), 16 ... rib, 17 ... stay, 20 ... stopper, 100 ... vehicle, 110 ... blower, 111 ... motor, 113 ... rotating shaft , 120 ... Heat exchanger, C ... Rotating axis

Claims (8)

A fan that rotates around the rotation axis and generates wind from the first direction of the rotation axis to the second direction opposite to the first direction.
A fan shroud capable of rotatably supporting the fan around the axis of rotation,
With
The fan
The fan body located on the rotation axis and
A plurality of fan blades extending from the outer peripheral surface of the fan body along a radial direction orthogonal to the rotation axis and arranged side by side in the circumferential direction around the rotation axis.
A connecting ring that connects the radial outer sides of the plurality of fan blades,
With
The fan shroud is a blower device that is arranged to face the connecting ring in the first direction of the connecting ring and has a stopper that regulates the displacement of the connecting ring in the first direction. The fan shroud
A ring portion that surrounds the fan around the rotation axis,
A fan support base arranged in the center of the ring portion in the radial direction to support the fan,
A shroud wall surface extending outward from the ring portion in the radial direction,
With
The blower according to claim 1, further comprising a motor provided on the surface of the fan support base in the second direction and having the fan body attached to a rotating shaft protruding toward the second direction. apparatus. The connecting ring is arranged at the outermost end in the radial direction of the fan blade.
The connecting ring has an outer flange portion that projects outward in the radial direction from the end portion in the second direction.
The blower according to claim 2, wherein the ring portion faces the outer flange portion in the direction of the rotation axis and functions as the stopper. When the length of the connecting ring in the direction of the rotation axis is L1 and the length of the ring portion in the direction of the rotation axis is L2, the lengths L1 and L2 of the connecting ring and the ring portion are L1. / 2≤L2≤L1 / 3
The blower according to claim 3, wherein the blower is formed so as to satisfy the above conditions. A plurality of stays provided on the front surface of the shroud wall surface in the first direction and straddling the fan support base and the shroud wall surface are provided.
When the distance between the outer flange portion and the ring portion in the direction of the rotation axis is L3 and the distance between the connecting ring and the stay in the direction of the rotation axis is L4, the outer flange portion , The ring portion and the stay have distances L3 and L4 of L3 <L4.
The blower according to claim 3 or 4, wherein the blower is formed so as to satisfy the above conditions. The distance L4 of the outer flange portion, the ring portion, and the stay is L4 ≧ L1 / 2.
The blower according to claim 5, wherein the blower is formed so as to satisfy the above conditions. A fan that rotates around the rotation axis and generates wind from the first direction of the rotation axis to the second direction opposite to the first direction.
A fan shroud capable of rotatably supporting the fan around the axis of rotation,
With
The fan shroud
A ring portion that surrounds the fan around the rotation axis,
A fan support base arranged in the center of the ring portion in the radial direction orthogonal to the rotation axis and for supporting the fan,
A shroud wall surface extending outward from the ring portion in the radial direction,
A plurality of stays provided on the front surface of the shroud wall surface in the first direction and straddling the fan support base and the shroud wall surface.
The front surface of the shroud wall surface is formed so as to project in the first direction, and extends along the radial direction from the vicinity of the outer peripheral portion of the ring portion to the vicinity of the outer peripheral edge of the shroud wall surface. Multiple ribs arranged side by side in the circumferential direction around the axis of rotation,
With
When the distance between the ribs adjacent to each other in the circumferential direction is θ, the plurality of ribs are
20 ≤ θ ≤ 25 °
A blower characterized by being formed so as to satisfy. The blower according to any one of claims 5 to 7, wherein the stay extends from the outer peripheral surface of the fan support base to the outer peripheral surface of the shroud wall surface.

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