JP3575557B2 - Blower - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a blower, for example, to a blower used for an air conditioner for a vehicle.
[0002]
[Prior art]
Conventionally, the shape of a flange stay of a blower motor has been cited as one of the causes of noise generation of a blower. The flange stay is intended to support the blower motor. However, depending on the shape of the flange stay, turbulence may occur in the air flow, which may cause noise and decrease the amount of blown air.
[0003]
The blower disclosed in Japanese Utility Model Publication No. 56-161196 uses an axial fan, and a stay of a fan shroud provided on the downstream side of the axial fan follows an air flow inclined with respect to the rotation axis of the axial fan. By adopting a long streamline shape, the air flow is rectified to reduce noise and increase the amount of blown air.
Also, in a centrifugal blower that sucks air from the motor side, a stay that supports the motor toward the air flow to be sucked is formed in a convex shape to reduce turbulence and reduce noise.
[0004]
[Problems to be solved by the invention]
However, the stay shape of the blower disclosed in Japanese Utility Model Publication No. 56-161196 has an effect of reducing noise in a blower using an axial fan and having a fan shroud downstream of the axial fan. However, the effect of reducing the occurrence of turbulence can be reduced even when used in a blower of a type that sucks air from the radial direction of the motor shaft, such as a blower used for a cooler installed in a place where the space in a car is limited. Since there is not much, it is difficult to reduce the noise and increase the air volume.
[0005]
When the stay is formed in a convex shape with respect to the air flow, it is assumed that the air flow is almost parallel to the rotation axis of the motor. It is difficult to reduce.
The present invention has been made to solve such a problem, and an object of the present invention is to provide a fan with low noise.
[0006]
[Means for Solving the Problems]
The blower according to claim 1 of the present invention for achieving the above object,
In a blower that sucks air from the motor side,
A fan for sucking and discharging the air is driven to rotate by the motor,
Having a stay that supports the motor while dividing the air intake port, and a motor support portion provided on the upstream side of the air flow from the fan,
At least one of the stays has a wing shape for diverting intake air sucked toward the stay from a diagonally lower side of a rotation axis of the motor toward the stay, and a direction of a rotation axis of the motor with respect to the intake air. It is characterized in that it is formed in a wing shape which is inclined so as to proceed to. Here, the wing shape refers to a shape in which the thickness gradually increases from both ends toward the center.
[0007]
A blower according to a second aspect of the present invention is the blower according to the first aspect, further comprising a guide member that introduces air to the motor support from one radial direction or one radial direction lower side of the motor. .
A blower according to a third aspect of the present invention is the blower according to the first or second aspect, wherein the blower is formed into a wing shape for dividing intake air, and is inclined in the same direction with respect to a circumferential direction of the motor support. It is characterized in that there are at least two stays.
[0008]
A blower according to a fourth aspect of the present invention is the blower according to the first, second or third aspect, wherein the stay formed in a wing shape for dividing the intake air is formed in an arc-shaped cross section. .
A blower according to a fifth aspect of the present invention is the blower according to the first, second, third, or fourth aspect, wherein a backflow suppressing unit that suppresses an amount of air flowing backward from the fan to the motor support is provided on the motor support. It is characterized by having.
[0009]
[Action and effect of the invention]
According to the blower according to the first aspect of the present invention, at least one of the stays of the motor supporting portion for supporting the motor is formed in a wing shape for diverting the intake air, so that the stay rectifies the intake air to the fan. Can be introduced. For this reason, since the occurrence of turbulence in the air flow can be reduced, the noise due to the blowing is reduced and the blowing amount is increased.
[0010]
According to the blower according to the second aspect of the present invention, by providing a guide member for introducing air into the motor support from one radial direction or one radial direction lower side of the motor, the axial size of the blower is reduced.
According to the blower according to the third aspect of the present invention, since there are at least two stays which are inclined in the same direction with respect to the circumferential direction of the motor support portion and are formed in the shape of a wing, the blower extends along the rotation direction of the motor. Since the sucked air flow is smoothly introduced to the fan side by the stay, noise can be further reduced.
[0011]
According to the blower according to the fourth aspect of the present invention, since the cross section of the wing-shaped stay is formed in an arc shape, the intake air can be rectified and the intake air can be smoothly guided in the motor axial direction. The lowering effect is further improved.
According to the blower according to the fifth aspect of the present invention, the backflow suppressing means for suppressing the amount of air flowing backward from the fan to the motor support portion is provided in the motor support portion, so that noise generated by the backflow can be reduced. .
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
4 and 5 show an embodiment in which the blower of the present invention is applied to a centrifugal multi-blade blower for a rear cooler of a passenger car.
A rear cooler is mounted between a rear tray behind a rear seat of a passenger car and an upper surface of a fuel tank below the rear tray. As can be seen from FIGS. 4 and 5, it can be understood that the rear cooler installed particularly on the rear side of the passenger car is thin overall because of the limited installation space.
[0013]
An air inlet 31 communicating with the vehicle interior is formed at a portion of the case 30 connected to the rear tray at one end, and an air filter 41 is attached below the air inlet 31. A duct 32 is provided between the air filter 41 and the centrifugal blower 1 to guide the intake air, and introduces air taken in from the air intake 31 into the multi-blade blower 1. As shown in FIGS. 6 and 7, the duct 32 has a triangular cross section of the air flow path. The opening 32a of the duct 32 is formed substantially parallel to the rear tray, and the deepest portion 32b of the duct 32 is shifted in the direction of arrow A in FIGS.
[0014]
The multi-blade blower 1 includes a motor mounting unit 10, a motor 20, and a multi-blade fan 21. An evaporator 42 is provided on the air outlet side of the multi-blade blower 1, and the outlet side of the evaporator 42 is branched into two ducts and connected to air outlets 51 and 52, respectively. The air outlets 51 and 52 are arranged so that the air blows to the rear seats through air outlets located above both rear side doors of the passenger compartment.
[0015]
Next, the configuration of the motor mounting portion 10 of the multi-blade blower 1 will be described in detail with reference to FIGS.
The motor mounting portion 10 includes stays 11, 12, 13, a motor fixing portion 14, a flange 15, a flat plate portion 16, and an annular cover 17. In addition, since these components are integrally formed of resin, there is an effect that the assembling work of the motor mounting portion 10 can be easily performed.
[0016]
The stays 11, 12, and 13 extend radially from the fixing portion 14 for fixing the motor 20 at intervals of 120 ° from each other, and connect the fixing portion 14 and the flange 15. As shown in FIGS. 2 and 3, the stay 12 is formed in an arcuate cross-section, and the inner peripheral surface 12 a formed in a concave curved shape is opposed to the circumferential direction of the motor mounting portion 10. It extends downward. The radius of the inner peripheral surface 12a is set to 21.5 mm, and the radius of the outer peripheral surface 12b is set to 17.5 mm. The inclination angle θ of the stay 12 with respect to the rotation axis of the motor 20 is 60 °. The stay 11 is formed in substantially the same wing shape as the stay 12, and an inner peripheral surface formed in a concave curved surface like the stay 12 is opposed to the circumferential direction of the mounting portion 10 so as to be opposed to the rotation axis of the motor 20. On the other hand, it is inclined at θ = 60 °. The reason why the stays 11 and 12 are formed into a wing shape in which the central portion is swelled more than both ends is to reduce the noise and to improve the strength of the stay. The stay 13 is formed in a flat plate shape.
[0017]
The fixing portion 14 is formed in a bowl shape, and is provided with a through hole 14a at the center thereof, which can pass through the rotation shaft 20a of the motor 20. The motor 20 is wrapped in the fixed portion 14 through the rotary shaft 20a in the through hole 14a, and is fixed to the fixed portion 14 by screws 60.
The flange 15 is formed in an annular shape so as to form an air inlet on the radially inner side, and connects the outer peripheral portion to the annular cover 17. The annular cover 17 is provided with a triangular mounting portion 18 protruding radially outward, and the motor mounting portion 10 is fixed to the case 30 by screwing the mounting portion 18 to a rear cooler case 30.
[0018]
A flat plate portion 16 serving as a backflow suppressing means is provided on the inner peripheral side of the flange 15 on the back side in the air suction direction. The flat plate portion 16 is formed on the downstream side of the air flow of the stay 13 in a bow shape symmetrical with respect to the stay 13. The flat plate portion 16 is provided so as to suppress the air flow which tends to flow backward from the multi-blade fan 21 side to the motor mounting portion 10 side shown in FIG. 4 and to prevent the air from being sent to the position where the reverse flow is generated.
[0019]
Next, the air flow of the rear cooler will be described.
The air sucked in from the air inlet 31 removes dust contained in the air by the air filter 41 and is introduced into the duct 32. A lot of air flows into the duct 32 on the arrow A side in FIGS. 6 and 7, and is sucked into the stay 12 side of the multi-blade blower 1 as shown in FIG.
[0020]
The air sucked toward the stay 12 from the obliquely lower side in the radial direction of the rotating shaft 20a is rectified while being diverted to the inner peripheral surface 12a side and the outer peripheral surface 12b side by the wing-shaped stay 12. The intake air changes its direction in the direction of the rotating shaft 20a while suppressing the generation of turbulence. Since the inner peripheral surface 12a is formed in a concave shape inclined so as to advance in the direction of the rotation axis 20a with respect to the intake air, the intake air can be smoothly guided in the direction of the rotation axis 20a without generating turbulent flow. . Part of the air that has not been guided toward the multi-blade fan 21 on the inner peripheral surface 12a is guided along the outer peripheral surface 20b toward the rotation axis 20a. The air flow that could not be introduced to the multi-blade fan 21 by the stay 12 is guided by the inner peripheral wall of the duct 32 and goes around to the stay 11 side. The air flowing around the stay 11 is rectified by the stay 11 formed in a blade shape, and is guided to the inner peripheral surface to be smoothly guided to the multi-blade fan 21 side. The air discharged from the multi-blade fan 21 to the outside in the radial direction of the multi-blade fan 21 is introduced into the evaporator 42, and the air cooled by the evaporator 42 is blown into the passenger compartment from the air outlets 51 and 52.
[0021]
Next, FIG. 8 shows an experimental result of measuring the blowing noise when the inclination angle θ of the stay was changed. FIG. 8 shows a noise value (overall value) measured 200 mm above the air intake 31 of the rear cooler shown in FIGS. 4 and 5.
As can be seen from FIG. 8, when 30 ° ≦ θ ≦ 75 °, the noise is 53.7 db or less, which is a desirable measurement result. Further, when 45 ° ≦ θ ≦ 65 °, the noise is 53.2 db or less, which is a more desirable measurement result.
[0022]
In the present embodiment, by utilizing the extra space in the fan axis direction more effectively, it is effective in a layout where there is no extra space in the fan axis direction such as a rear cooler of a passenger car, and the size in the fan axis direction is reduced. By doing so, the size of the blower can be reduced. Therefore, it can be attached to a small space portion in the fan axial direction such as a rear cooler.
[0023]
In this embodiment, the centrifugal multi-blade fan 21 is used as a fan. However, in the present invention, a fan having any shape may be used as long as air is sucked and discharged. For example, an axial fan may be used. Is also possible.
[Brief description of the drawings]
FIG. 1 is a plan view of a blower according to an embodiment of the present invention.
FIG. 2 is a front view of a blower according to an embodiment of the present invention.
FIG. 3 is a sectional view taken along line III-III of FIG. 1;
FIG. 4 is a configuration diagram showing a layout example in which the blower of the present embodiment is mounted on a rear cooler of a passenger car.
FIG. 5 is a view as seen in the direction of arrow V in FIG. 4;
FIG. 6 is a plan view showing a duct for guiding air to the multi-blade blower of the present embodiment.
FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;
FIG. 8 is a characteristic diagram illustrating a relationship between a stay inclination angle and noise according to the present embodiment.
[Explanation of symbols]
1 multi-blade blower (blower)
10 Motor mounting parts 11, 12, 13 Stay 15 Flange 16 Flat plate part (backflow suppressing means)
20 Motor 21 Multi-blade fan (fan)
31 air intake 32 duct (guide member)
51, 52 Air outlet

Claims (5)

In a blower that sucks air from the motor side,
A fan for sucking and discharging the air is driven to rotate by the motor,
Having a stay that supports the motor while dividing the air intake port, and a motor support portion provided on the upstream side of the air flow from the fan,
At least one of the stays has a wing shape for diverting intake air sucked toward the stay from a diagonally lower side of a rotation axis of the motor toward the stay, and a direction of a rotation axis of the motor with respect to the intake air. A blower characterized in that it is formed in a wing shape that is inclined so as to proceed to . The blower according to claim 1, further comprising a guide member that introduces air into the motor support from one radial direction or one radial direction lower side of the motor. 3. The blower according to claim 1, wherein at least two stays are formed in a blade shape for dividing intake air, and are inclined in the same direction with respect to a circumferential direction of the motor support. 4. The blower according to claim 1, wherein the stay formed in a wing shape for dividing the intake air is formed in an arc-shaped cross section. 5. The blower according to claim 1, wherein a backflow suppressing unit that suppresses a flow rate of air flowing backward from the fan to the motor support is provided in the motor support. 6.

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