JP2001165093A - Air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air blower of simple structure capable of providing a high capacity and reducing noise. SOLUTION: This air blower 1 comprises a number of vanes 17 disposed annularly therein, a centrifugal fan 11 blowing the air led from an air intake port 1 to the inside of a ring radially to the outside, a motor 13 drivingly rotating the centrifugal fan 11, and a cylindrical case 9 allowing the centrifugal fan 11 to be stored therein and forming an air blow passage. Air is blown from one opening 23 in the case 9 to the other opening 25. The centrifugal fan 11 is disposed with the air intake port 19 positioned facing toward one opening 23 of the case and with a rotating axis 27 positioned along the air blowing direction of the case 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for blowing air.

[0002]

2. Description of the Related Art Generally, an axial fan or a centrifugal fan is used as a blower. However, a centrifugal fan is often used in an air conditioner for a vehicle because a high air volume can be obtained at a low pressure. Have been.

As this type of blower, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 11-37096, a centrifugal fan is housed in a scroll case and is sent outward from the centrifugal fan in the circumferential direction. A blower that blows the wind from a scroll outlet is known.

[0004]

However, in the above-described conventional blower, the wind (induced flow) blown around the centrifugal fan by the scroll is guided. ) Cannot be guided, and specifically, the portion of about 60 degrees corresponding to the outlet cannot effectively guide the wind of the centrifugal fan, so that there is an inconvenience that the air volume cannot be improved accordingly. .

Further, various techniques for increasing the air volume have been proposed, but all have the problem that the configuration becomes complicated.

Further, in the air blower, various techniques related to noise reduction have been conventionally proposed, but further reduction of noise is desired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a blower having a simple structure capable of obtaining a high air volume and reducing noise.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a large number of blades are arranged in a ring shape, and a wind introduced into the inside of the ring from an air inlet is formed in a radial direction. A centrifugal fan that blows outward, a motor that rotationally drives the centrifugal fan, and a cylindrical case that houses the centrifugal fan and forms a ventilation passage, and that blows air from one opening of the case to the other opening. The apparatus, wherein the centrifugal fan comprises:
An air inlet is arranged toward one opening of the case, and a rotation axis is arranged along a blowing direction of the case.

According to the first aspect of the present invention, when the centrifugal fan is rotated by driving the motor, air is sucked from the air suction port of the centrifugal fan facing one opening of the cylindrical case, and the centrifugal fan is rotated. Introduce air inside,
The air is blown outward in the radial direction of the centrifugal fan. Since the blown air has a vector directed to the other opening (downstream side) of the case, the air is directed radially outward and obliquely downstream. Be blown out. The blown air is guided by the inner wall of the case and is blown to the downstream side of the case. In the present invention, the air blown from the entire periphery (360 degrees) of the centrifugal fan is guided by the inner wall of the case as it is, and the entire inner periphery of the case is used as the outlet as it is. The noise can be reduced.

In particular, since the centrifugal fan and the motor are housed in a case which is an air passage, sound is hardly leaked, and noise can be further reduced.

Further, since the centrifugal fan and the motor are merely housed in the case, the structure is simple. The centrifugal fan is arranged so that the suction port is directed to the upstream side in the blowing direction, so that the size of the apparatus is small. Can be achieved. In particular, if the duct forming the air passage is used as a case, the centrifugal fan and the motor can be stored in the duct as it is, so that the configuration can be further simplified.

According to a second aspect of the present invention, in the first aspect of the present invention, the case has a guide plate on its inner wall for guiding wind blown from the centrifugal fan toward the other opening. It is characterized by the following.

According to the second aspect of the present invention, the first aspect is provided.
The air blown radially outward from the centrifugal fan is guided to the downstream side of the case along the guide plate of the case, so that the air blowing efficiency is good.

According to a third aspect of the present invention, in the second aspect, the guide plate is curved in a radial direction from an outer periphery of the centrifugal fan toward an inner wall of the case. Is what you do.

According to the third aspect of the present invention, the second aspect is provided.
And the guide plate is curved along the vector of the air blown out from the centrifugal fan, so that the wind is efficiently guided.

According to a fourth aspect of the present invention, in the second or third aspect, the guide plate is provided on the inner wall side of the case from the convex surface of the guide plate to the concave surface side of the adjacent guide plate. It is characterized in that it has an auxiliary piece extending toward it.

According to the fourth aspect of the present invention, the second aspect is provided.
Or the effect described in 3 above, and when the air blown from the centrifugal fan is guided along the guide plate, the wind flowing along the convex surface can be prevented from separating from the convex surface. The fan efficiency can be improved and the noise at the natural frequency can be reduced. Furthermore, since it is not necessary to reduce the angle of the joint between the guide plate and the inner wall of the case, the die can be easily cut out in the manufacture of the case and the manufacture is easy.

[0018] The invention according to claim 5 is the invention according to claims 1 to 4.
In the invention according to any one of the above, the centrifugal fan is characterized in that a surface of the blade is a flat surface along a radial direction.

According to the fifth aspect of the present invention, the first aspect is provided.
In addition to the effects described in any one of (4) to (4), the so-called radial fan is used as the centrifugal fan, so that noise can be reduced.

The invention according to claim 6 is the invention according to claims 1 to 4
In the invention described in any one of the above, the centrifugal fan is characterized in that a blade surface is a curved surface inclined forward with respect to a rotation direction.

According to the sixth aspect of the present invention, there is provided the first aspect.
5 and the so-called multi-blade fan is used as the centrifugal fan, so that a predetermined air volume can be obtained at a low pressure, the fan efficiency is good, and the multi-blade fan is further improved. Is widely used,
Easy to manufacture.

The invention according to claim 7 is the invention according to claims 1 to 4.
In the invention described in any one of the above, the centrifugal fan is characterized in that a surface of the blade is a curved surface inclined backward with respect to a rotation direction.

According to the invention described in claim 7, according to claim 1,
In addition to the effects described in any one of (4) to (4), a so-called turbo fan is used as the centrifugal fan, so that high pressure and high air volume can be achieved.

[0024] The invention described in claim 8 is the invention according to claims 1 to 7.
In the invention according to any one of the above,
It is an air conditioning duct for vehicles in which at least an evaporator or a heater core is arranged.

According to the eighth aspect of the present invention, there is provided the first aspect.
In addition to the effects described in any one of (7) to (7), the configuration can be simplified because the air-conditioning duct that blows air to the evaporator can be used as a case.

[0026]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. First, a first embodiment of the present invention will be described with reference to FIGS. The blower 1 according to the embodiment of the present invention is mounted on a vehicle air conditioning duct 3.

The vehicle air-conditioning duct 3 includes an evaporator 5 and an evaporator case 7 in which the evaporator 5 is housed. The air blower 1 is provided upstream of the evaporator 5. Air flows through the air conditioning duct 3 from 1 to the evaporator 5.

The blower 1 includes a case 9, a centrifugal fan 11 and a motor 13 housed in the case 9.

The case 9 has a cylindrical shape and is connected to the evaporator case 7. The case 9 and the evaporator case 7 constitute the air conditioning duct 3.

The centrifugal fan 11 has a large number of blades 17 arranged in a ring around a cone 15, and an air suction port 19 is formed on the side facing the cone 15. The centrifugal fan 11 is an existing one generally used for a blower or the like. The centrifugal fan 11 has an air inlet 1
Air is introduced into the inside of the blade 17 arranged annularly from 9,
Blows air outward in the radial direction.

In this embodiment, the blade 17 is a so-called multi-blade fan, which is curved in the radial direction and has a curved concave surface facing upstream in the rotational direction.
In addition, the dimension in the radial direction is configured to be short.

A bell mouth 21 is provided on the air suction port 19 side.
Are formed to guide the suction of air.

The rotation axis 27 of the centrifugal fan 11 is arranged along the air blowing direction from the upstream opening (one opening) 23 to the downstream opening (the other opening) 25 of the case 9.

A motor 13 for driving the centrifugal fan 11 is disposed on the cone 15 side of the centrifugal fan 11.
The motor 13 is connected to the stay 2 extending from the inner wall of the case 9.
9 is held at the center of the case. By providing the stay 29 integrally with the case 9 in advance, the motor 13
Can be easily assembled.

In the present embodiment, the stays 29 are resin plates formed integrally with the case, and are provided at three positions (120 degrees) circumferentially equally divided from the inner wall of the case 9. . Each of the stays 29 has a plate surface oriented parallel to the air blowing direction to reduce ventilation resistance. Stay 29 is
It is preferable to reduce the air resistance by providing R (R) at the front end side and the rear end side in the blowing direction.

The motor 13 is provided with a register 31, which is an electronic component for controlling the driving of the motor 13, and the register 31 includes cooling fins 33. In the present embodiment, the register 31 is arranged in the case 9 and fixed to the motor 13, and the fins 33 are arranged in parallel to the air blowing direction. This prevents wind resistance and enhances cooling efficiency.

In the present embodiment, the centrifugal fan 11
Is simply arranged in the case 9 along the direction of air flow of the case 9 so that the configuration is simple and the assembly is also simple. Further, since the size of the blower 1 in the thickness direction (the direction of the rotation axis) of the centrifugal fan 11 is short, the installation space can be reduced.

In particular, since the centrifugal fan 11 is arranged in the case 9 constituting the air conditioning duct 3, the motor noise during driving can be kept in the case, and it is hard to leak outside, so that the noise can be reduced. it can.

Next, the operation of the first embodiment will be described. When the motor 13 is driven, the centrifugal fan 11 rotates about the rotation axis 27, and the air guided to the bell mouth 21 from the upstream opening of the case 9 is taken into the centrifugal fan 11. The air taken into the inside of the centrifugal fan 11 blows the wind from the radially inner side to the outer side over the entire periphery of the centrifugal fan 11.

The wind blown outward in the radial direction is
As shown by an arrow S in FIG. 1, since the vector has a vector directed to the downstream side, it is blown diagonally downstream. The wind blown obliquely toward the downstream side is guided along the inner wall surface of the cylindrical case 9 and is sent to the downstream side (evaporator 5 side).

Here, the blower 1 according to the present embodiment
The relationship between the air volume and the fan efficiency was measured, and the results are shown in FIG. In FIG. 3, the horizontal axis indicates the air volume and the vertical axis indicates the fan efficiency. The solid line indicates the present embodiment, and the broken line indicates the conventional blower. As is clear from the graph of FIG. 3, according to the present embodiment, the fan efficiency is superior to the conventional one in the region of the high air volume.

FIG. 4 shows the result of measuring the relationship between the air volume and the noise. FIG. 4 shows the air volume on the horizontal axis and the noise on the vertical axis. The solid line shows this embodiment, and the broken line shows a conventional blower. As is clear from the graph of FIG. 4, according to the present embodiment, the noise is lower than in the related art in the region of the high airflow.

Further, since a so-called multi-blade fan is used as the centrifugal fan, a predetermined air volume can be obtained at a lower pressure as compared with the case where another type of centrifugal fan is used, and the fan efficiency is good. In addition, since the multi-blade fan is widely used widely, it is easy to manufacture the blower 1.

Next, another embodiment of the present invention will be described. In the embodiment described below, parts having the same functions as those of the above-described embodiment are denoted by the same reference numerals. Accordingly, detailed description of the portions will be omitted, and points different from the above-described first embodiment will be mainly described.

The second embodiment shown in FIGS. 5 to 8 differs from the above-described embodiment in that a guide plate 37 is provided on the inner wall of the case 9. The guide plate 37 guides the wind blown from the centrifugal fan 11, and is curved radially from the outer periphery of the centrifugal fan 11 toward the inner wall of the case 9, and receives the wind received by the curved surface. Guided in the radial direction. In the present embodiment, four guide plates 37 are arranged at equal intervals on the inner wall of the case 9, but the shape and the number are not particularly limited. It is desirable that the angle of attack R (see FIG. 6) of the winding angle start portion 37a of the guide plate 37 be determined according to the target air volume.
For example, the angle of attack R may be equal to the outflow angle of the trailing edge of the blade 17. Further, the pitch between the guide plates 37 may be made unequal.

Further, by lining the tongue of the angle-of-attack portion 37a of the guide plate 37, noise can be further reduced.

In the second embodiment, the same effects as those of the first embodiment can be obtained, and a high air volume can be obtained. That is, the relationship between the rotation speed of the centrifugal fan and the airflow was measured, and the results are shown in FIG. FIG.
In the graph, the horizontal axis indicates the rotation speed of the centrifugal fan 11, and the vertical axis indicates the air volume. The solid line indicates the present embodiment, and the broken line indicates a conventional blower. As is clear from the graph of FIG. 4, according to the present embodiment, it is apparent that a higher air volume than in the related art is obtained in all the rotation speed regions.

FIGS. 9 and 10 show a third embodiment.
In the third embodiment, a radial fan 41 is used instead of the multi-blade fan used as the centrifugal fan of the first embodiment.
Is used. This radial fan 41 is shown in FIG.
As shown in (1), the point that the annularly arranged blades 17 are formed in a flat plate shape along the radial direction is different.

By using such a radial fan 41, the noise can be further reduced as shown in FIG. 10 showing the relationship between the air volume and the noise. In addition, FIG.
The horizontal axis indicates the air volume, and the vertical axis indicates the noise. The solid line indicates the present embodiment, and the broken line indicates the conventional blower.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

For example, in the second embodiment, the guide plate 37 disposed on the inner wall of the case has a curved plate shape as shown in FIGS. May be provided with an auxiliary piece 43. In this case, the guide plate 37 and the auxiliary piece 43 may serve as the case 9 without forming a space surrounded by the case 9, the guide plate 37, and the auxiliary piece 43. According to these configurations, when the wind blown from the centrifugal fan 11 is guided along the guide plate, the wind flowing along the convex surface can be prevented from separating from the convex surface, so that the fan efficiency can be improved. Can be improved and noise at the natural frequency can be reduced. Further, the guide plate 37
It is not necessary to reduce the angle of the joint between the case and the inner wall of the case 9, so that the mold can be easily cut out in the manufacture of the case. When it is configured, it is easier to remove the mold, and the manufacturing is easier.

Further, as shown in FIG.
May be attached to the stay 29 that holds the motor 13.

The centrifugal fan 11 is not limited to the multi-blade fan and the radial fan described above, but may be a turbo fan. Here, the turbo fan refers to a blade in which the blades 17 are inclined backward in the rotation direction and are curved in a convex shape. When a so-called turbo fan is used as the centrifugal fan, high pressure and high air volume are possible.

[0054]

According to the first aspect of the present invention, the inner wall of the case guides the wind blown from the entire periphery (360 degrees) of the centrifugal fan, and the entire inner periphery of the case is used as the outlet. In addition, a high air volume can be obtained, pressure loss can be reduced, and noise can be reduced.

Since the centrifugal fan and the motor are housed in the case, which is a ventilation passage, sound hardly leaks and noise can be further reduced.

Since only the centrifugal fan and the motor are housed in the case, the configuration is simple. The centrifugal fan has a configuration in which the suction port is directed to the upstream side in the blowing direction, so that the size of the apparatus can be reduced. Can be planned.

According to the invention described in claim 2, according to claim 1
And the air blown radially outward from the centrifugal fan is efficiently guided by the guide plate toward the downstream side in the blowing direction, so that the blowing efficiency is good.

According to the invention described in claim 3, according to claim 2
And the guide plate is curved along the vector of the air blown from the centrifugal fan, so that the air can be efficiently blown.

According to the invention set forth in claim 4, according to claim 2
Or the effect described in 3 above, and when the wind blown from the centrifugal fan is guided along the guide plate, it is possible to prevent the wind flowing along the convex surface from separating from the convex surface, The fan efficiency can be improved and the noise at the natural frequency can be reduced. Furthermore, since it is not necessary to reduce the angle of the joint between the guide plate and the inner wall of the case, the die can be easily cut out in the manufacture of the case, and the manufacture is easy.

According to the invention described in claim 5, according to claim 1
And the effect according to any one of (4) to (4),
Since a so-called radial fan is used as the centrifugal fan, noise can be reduced.

According to the invention of claim 6, according to claim 1,
And the effect according to any one of (4) to (4),
Since a so-called multi-blade fan is used as the centrifugal fan, a predetermined air volume can be obtained at low pressure, the fan efficiency is good, and the multi-blade fan is widely used, so that it is easy to manufacture a blower. .

According to the invention of claim 7, according to claim 1,
And the effect according to any one of (4) to (4),
Since a so-called turbo fan is used as the centrifugal fan, high pressure and high air volume are possible.

According to the invention of claim 8, according to claim 1,
And the effect according to any one of (1) to (7),
Since the air-conditioning duct for blowing air to the evaporator can be used as a case, the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a vehicle air-conditioning duct equipped with a blower according to a first embodiment.

FIG. 2 is a cross-sectional view of the blower shown in FIG.

FIG. 3 is a graph showing a relationship between an air volume and a fan efficiency of the blower shown in FIG.

FIG. 4 is a graph showing the relationship between the air volume and noise of the blower shown in FIG.

FIG. 5 is a longitudinal sectional view of a vehicle air conditioning duct equipped with a blower according to a second embodiment.

FIG. 6 is a perspective view of the blower shown in FIG.

FIG. 7 is a cross-sectional view of the blower shown in FIG.

8 is a graph showing the relationship between the number of rotations and the air volume of the air blower shown in FIG.

FIG. 9 is a cross-sectional view of a blower according to a third embodiment.

10 is a graph showing the relationship between the air volume and noise of the air blower shown in FIG.

FIG. 11 is a perspective view of a blower according to another embodiment.

FIG. 12 is a cross-sectional view of the blower shown in FIG.

FIG. 13 is a longitudinal sectional view of a vehicle air conditioning duct according to another embodiment.

[Description of Signs] 1 blower 3 vehicle air-conditioning duct 5 evaporator 9 case 11 centrifugal fan 13 motor 17 blade 19 air suction port 23 upstream opening (one opening) 23 downstream opening (other opening) 37 guide plate 41 Radial fan 43 auxiliary piece

Claims (8)

[Claims] 1. A centrifugal fan for arranging a large number of blades in a ring shape and blowing air introduced into the ring from an air suction port to a radial outside, a motor for rotating and driving the centrifugal fan, and a centrifugal fan housed therein. A cylindrical case forming a blower passage, wherein the blower blows air from one opening of the case to the other opening, wherein the centrifugal fan directs an air suction port toward one opening of the case. Wherein the rotation axis is arranged along the air blowing direction of the case. 2. The blower according to claim 1, wherein the case has a guide plate on an inner wall thereof for guiding wind blown from a centrifugal fan toward the other opening. 3. The blower according to claim 2, wherein the guide plate is curved radially from an outer periphery of the centrifugal fan toward an inner wall of the case. 4. The guide plate according to claim 2, further comprising an auxiliary piece extending from a convex surface of the guide plate toward a concave surface of the adjacent guide plate on the inner wall side of the case. 4. The blower according to 3. 5. The blower according to claim 1, wherein the centrifugal fan has a blade having a flat surface along a radial direction. 6. The blower according to claim 1, wherein the centrifugal fan has a blade surface that is a curved surface that is inclined forward in the rotation direction. 7. The blower according to claim 1, wherein the blade of the centrifugal fan has a curved surface that is inclined backward with respect to the rotation direction. 8. The blower according to claim 1, wherein the case is an air conditioning duct for a vehicle in which at least an evaporator or a heater core is arranged.