JP3812536B2 - Centrifugal blower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centrifugal blower, and has an inside air introduction port for introducing vehicle interior air (hereinafter abbreviated as inside air) and an outside air introduction port for introducing vehicle outside air (hereinafter abbreviated as outside air). The present invention is effective when applied to a vehicle air conditioner of a two-layer flow type in which the inside air and the outside air can be separated and simultaneously sucked.
[0002]
[Prior art]
In a blower for an inside / outside air two-layer flow type air conditioner, the air sucked into the scroll casing from the suction port is divided into two flows by a duct and distributed to two fans (for example, refer to Patent Document 1). .
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-19445
[Problems to be solved by the invention]
FIG. 4 is a schematic diagram of a centrifugal blower used in a normal air conditioner that cannot separate the inside air and the outside air and sucks the rotational force generated by the motor 10 to the blade 21. The air sucked into the fan from the suction port by the flange portion 22 in the shape of a trumpet is guided (turned) toward the blade 21 and distributed to a plurality of blades arranged around the rotation axis.
[0005]
In the invention described in Patent Document 1, a centrifugal fan used in a normal air conditioner, that is, a fan for an internal / external air two-layer flow type air conditioner, is stacked in two stages in the axial direction. Therefore, the number of parts and assembly man-hours are large, and it is difficult to reduce the manufacturing cost.
[0006]
Therefore, as shown in FIG. 5, the inventor divides the air sucked into the fan from the suction port into two flows by the flange portion 22 of the fan, so that the air-conditioner for the inside / outside air two-layer flow type air conditioner is used. Although an attempt was made to reduce the manufacturing cost of the blower, the following problems may occur.
[0007]
That is, as described above, the air sucked into the fan is turned to the blade 21 side by the flange portion 22, but in the investigation product shown in FIG. 5, the air sucked from the outer diameter side of the suction port is Guided by the flange 22 and guided to the blade side.
[0008]
However, since there is no means for guiding the air sucked from the center side of the suction port to the blade 21 side, the sucked air collides with the motor 10 and turns to the blade 21 side, but peels off from the outer surface of the motor 10. There is a high possibility that the generated air will generate vortices, leading to vortex pressure loss and noise, leading to a reduction in blowing capacity.
[0009]
To solve this problem, it is only necessary to provide a flange portion on the motor 10 side of the fan 20. However, if a flange portion is also provided on the motor 10 side of the fan 220, the fan is integrally formed by die cutting in the vertical direction on the paper. It is difficult to reduce the manufacturing cost of the fan.
[0010]
In view of the above points, the present invention firstly provides a novel centrifugal blower different from the conventional one, and secondly, it is possible to integrally form a fan while reducing eddy pressure loss and noise. And
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a plurality of blades (21) arranged around a rotation axis in the invention described in claim 1, and the diameter of air sucked from one end in the axial direction is as follows. The centrifugal fan (20) that blows outward, the driving means (10) that rotates the fan (20), and the fan (20) are housed and sucked into one axial end of the fan (20). And a scroll casing (30) provided with a mouth (35). The fan (20) transmits the rotational force generated by the driving means (10) to the blade (21), and at the suction port (35). There is provided a hub (22) for dividing the air sucked into the fan (20) into two flows and guiding the air flow on one side to the blade (21), and further divided by the hub (22). The air flow on the other side Guide portion for guiding (21) (40), characterized in that provided in the scroll casing (30) side.
[0012]
As a result, the air flow on the other side separated by the hub (22) can be smoothly guided to the blade (21) without causing separation, so that two types of air can be blown without generating eddy pressure loss or noise. It becomes possible to do.
[0013]
Moreover, since the guide part (40) is provided not on the rotating fan (20) but on the non-rotating scroll casing (30) side, the fan (20) has two types for guiding the air flow in the direction of the rotation axis. There is no need to provide a hub.
[0014]
Therefore, since the fan (20) including the hub (22) can be easily integrally formed by die cutting in the rotation axis direction, the manufacturing cost of the fan (20) can be reduced.
[0015]
In the second aspect of the present invention, the drive means (10) is fixed to the scroll casing (30) at the other axial end of the fan (20), and the guide portion (40) is the scroll casing. Of the (30) side, the drive means (10) is provided on an attachment flange (11) for fixing the drive means (10) to the scroll casing (30).
[0016]
In the third aspect of the present invention, the driving means (10) is fixed to the scroll casing (30) at the other axial end of the fan (20), and the guide portion (40) includes the driving means. It is formed so that the suction inlet (35) side may be covered among (10).
[0017]
Thus, air that has collided with the driving means (10) can be prevented from being peeled off at, for example, a stepped portion of the driving means (10), so that the hub (22) does not generate eddy pressure loss or noise. ) Can be guided to the blade (21) more smoothly, and the air blowing capacity can be increased.
[0018]
Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is a schematic view of a centrifugal blower 1 for an air-conditioner for a two-layer air flow type vehicle according to the present embodiment, and FIG. 2 is a top view of the fan 20 viewed from the inlet side.
[0020]
In the air conditioning casing connected to the downstream side of the air flow of the centrifugal blower 1, devices for adjusting the air temperature such as an evaporator, a heater core, and an air mix door are disposed.
[0021]
In FIG. 1, an electric motor 10 is a driving means for rotating a centrifugal fan 20, and the fan 20 has a plurality of blades 21 arranged around a rotation axis CL and has one end in the axial direction. It is an impeller which blows inhaled air toward the radially outward side. The motor 10 is fixed to a scroll casing 30 described later via a mounting flange 11 provided on the outer periphery of the motor housing.
[0022]
The hub 22 is an impeller main plate that transmits the rotational force of the motor 10 to the fan 20, that is, the blade 21. The hub 22 has a trumpet shape (a divergent shape) so that the diameter increases from the inlet 35 side toward the motor 10 side. The end portion of the blade 21 includes a flare portion 22a coupled to a substantially central portion in the longitudinal direction of the blade 21 and a flange portion 22b that connects the motor shaft 12 and the flare portion 22a. The flare portion 22a and the flange portion 22b are integrally formed of resin.
[0023]
For this reason, the air sucked into the fan 20 from the suction port 35 is divided into two flows by the flare portion 22a, and the air flow on the outer diameter side from the flare portion 22a is centered in the longitudinal direction of the blade 21 by the flare portion 22a. The air flow is guided to the suction port 35 side from the section, and the air flow on the center side from the flare section 22a collides with a portion of the motor 10 inserted into the fan 20 and turns to the motor 10 side from the longitudinal center part of the blade 21. Be made.
[0024]
As shown in FIG. 2, the flange portion 22 b is provided with an introduction port 22 c that introduces air flowing on the center side from the flare portion 22 a to the motor 10 side from the longitudinal center portion of the blade 21.
[0025]
Incidentally, in the present embodiment, the outside air taken in from the outside of the passenger compartment flows from the flare portion 22a on the center side, and the inside air taken in from the passenger compartment flows on the outer diameter side of the flare portion 22a.
[0026]
As shown in FIG. 1, the scroll casing 30 houses the fan 20 and constitutes an air passage that collects air blown from the fan 20. The air passage includes a first air passage in the air passage. A partition plate 33 that partitions the air passage 31 and the second air passage 32 is provided.
[0027]
Further, the scroll casing 30 is formed around the fan 20 in a spiral shape. In this embodiment, the cross-sectional areas of the first and second air passages 31 and 32 are logarithmically spiraled with respect to the winding angle. A suction port 35 through which air sucked by the fan 20 flows is provided on one end side in the axial direction, in the present embodiment, on the side opposite to the motor 10.
[0028]
The mounting flange 11 is integrally formed with a guide skirt portion 40 that smoothly guides the air that has flowed from the flare portion 22a toward the center and collided with the motor 10 to the blade 21. The guide skirt portion 40 has a suction port. It is formed in a trumpet shape (a divergent shape) so that the diameter increases as the distance from 35 increases. The guide skirt portion 40 is integrally formed with resin together with the mounting flange 11.
[0029]
Next, the function and effect of this embodiment will be described.
[0030]
The air sucked into the fan 20 from the suction port 35 is divided into two flows by the flare portion 22a, and the air flow on the outer diameter side from the flare portion 22a is not separated from the wall surface of the flare portion 22a and is separated into the blade 21. It is guided and blown into the first air passage 31.
[0031]
On the other hand, the air flow on the center side from the flare portion 22a collides with the motor 10 and flows through the wall surface of the motor 10 and flows into the guide skirt portion 40, and is not largely separated from the wall surface of the motor 10 and the wall surface of the guide skirt portion 40. The air is guided by the blade 21 and blown into the second air passage 32.
[0032]
Therefore, two types of air can be smoothly guided to the blade 21 and blown indoors without generating eddy pressure loss and noise.
[0033]
Further, since the guide skirt portion 40 is provided not on the rotating fan 20 but on the non-rotating scroll casing 30 side, that is, on the mounting flange 11, it is necessary to provide the guide skirt portion 40 on two types of flare-shaped guide portion fans 20 in the direction of the rotation axis CL. There is no.
[0034]
Therefore, since the fan 20 including the hub 22 can be easily integrally formed by die cutting in the direction of the rotation axis CL, that is, the vertical direction in FIG. 1, the manufacturing cost of the fan 20 can be reduced.
[0035]
As described above, according to the present embodiment, it is possible to obtain the centrifugal blower 1 having a high blower capacity and suitable for an air-conditioner for an inside / outside air two-layer flow type vehicle while reducing the manufacturing cost of the fan 20. it can.
[0036]
(Second Embodiment)
In this embodiment, as shown in FIG. 3, a guide skirt portion 40 is provided on the scroll casing 30 side so as to cover the entire portion of the motor 10 inserted into the fan 20, that is, the suction port 35 side of the motor 10. It is a thing.
[0037]
As a result, it is possible to prevent the air colliding with the motor 10 from being peeled off at the stepped portion of the motor 10, so that the air flowing from the flare portion 22a to the center side can be further reduced without generating eddy pressure loss and noise. The air can be smoothly guided to the blade 21 and the air blowing capacity can be increased.
[0038]
(Other embodiments)
In the above-described embodiment, the present invention is applied to the vehicle air conditioner, but the application of the present invention is not limited to this.
[0039]
In the above-described embodiment, the guide skirt portion 40 is provided on the mounting flange 11. However, in the present invention, the guide skirt portion 40 is provided on the side of the scroll casing 30 that does not rotate. Needless to say, the guide skirt portion 40 may be provided.
[0040]
Further, the flange 22b may be an axial fan so that air can be easily guided from the central portion in the longitudinal direction of the blade 21 to the motor 10 side.
[0041]
Further, in the above-described embodiment, the outside air taken in from the outside of the passenger compartment flows from the flare portion 22a and the inside air taken from the passenger compartment flows from the flare portion 22a to the outer diameter side. For example, the inside air may flow toward the center side from the flare portion 22a, and the outside air may flow toward the outer diameter side from the flare portion 22a.
[Brief description of the drawings]
FIG. 1 is a schematic view of a centrifugal blower according to a first embodiment of the present invention.
FIG. 2 is a top view of the fan according to the first embodiment of the present invention viewed from the inlet side.
FIG. 3 is a schematic view of a centrifugal blower according to a second embodiment of the present invention.
FIG. 4 is a schematic view of a centrifugal blower according to a conventional technique.
FIG. 5 is a schematic diagram of a centrifugal blower related to trial manufacture examination.
[Explanation of symbols]
10 ... Electric motor, 20 ... Fan, 21 ... Blade, 22 ... Hub,
22a ... Flare part, 22b ... Flange part, 30 ... Scroll casing,
33 ... partition plate, 40 ... guide skirt part.

Claims (3)

A centrifugal fan (20) having a plurality of blades (21) arranged around the rotation axis, and blowing out the air sucked from one end in the axial direction toward the radially outer side;
Drive means (10) for rotating the fan (20);
The fan (20) is housed, and the fan (20) has a scroll casing (30) provided with a suction port (35) on one end side in the axial direction,
The fan (20) transmits the rotational force generated by the drive means (10) to the blade (21), and air sucked into the fan (20) from the suction port (35) is 2 A hub (22) is provided to guide the air flow on one side to the blade (21) by dividing it into two flows;
Further, the centrifugal blower characterized in that a guide portion (40) for guiding the air flow on the other side divided by the hub (22) to the blade (21) is provided on the scroll casing (30) side. . The drive means (10) is fixed to the scroll casing (30) at the other axial end of the fan (20),
Further, the guide portion (40) is provided on an attachment flange (11) for fixing the drive means (10) to the scroll casing (30) on the scroll casing (30) side. The centrifugal blower according to claim 1. The drive means (10) is fixed to the scroll casing (30) at the other axial end of the fan (20),
Furthermore, the said guide part (40) is formed so that the said inlet (35) side may be covered among the said drive means (10), The centrifugal air blower of Claim 1 or 2 characterized by the above-mentioned.

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