JP3453763B2 - Blowers for air conditioners for vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for a vehicle air conditioner, and more particularly to a shape of an inside / outside air switching damper. 2. Description of the Related Art A conventional air blower of a vehicle air conditioner includes:
As shown in FIG. 4, there is a damper shaft 5 of the inside / outside air switching damper 4 which is shifted to the left or right with respect to the center 7a of the sirocco fan 7 (dimension A in the drawing) due to layout. When the shaft 5 is displaced from the center 7a of the sirocco fan 7 as described above, the tip 1
A shift (dimension B in the drawing) also occurs between the reference numeral 2 and the left end of the circular opening 9 in the drawing. [0003] Thus, the damper 4
When a deviation (dimension B) occurs between the tip 12 of the circular opening 9 and the left end of the circular opening 9 in the figure, for example, the inside / outside air switching damper 4 closes the outside air suction port 2 as shown by the two-dot chain line in the figure. In the case of the inside air mode, the tip 12 of the damper 4 reduces the opening area of the circular opening 9, thereby increasing the ventilation resistance at the opening 9 and, as a result, reducing the amount of air blown into the vehicle interior. Or the noise rises. Here, a method is conceivable in which the operating angle θ of the damper 4 is increased so that the opening area of the circular opening 9 is not reduced in the inside air mode. Is located in the upper part of the drawing, and as a result, the sirocco fan 7 draws in air through the gap between the damper tip 12 and the portion 1a of the blower case 1. Therefore, in order to prevent this, it is necessary to provide a wall for filling the gap between the portion 1a and the damper tip 12. Then, conversely, when the outside air mode is set as shown by the solid line in the figure, there is a problem that this wall becomes a cause of ventilation resistance and the amount of air blown into the vehicle interior is reduced. 4
Cannot be increased. If there is a displacement (dimension B) between the tip end 12 of the damper and the left end of the circular opening 9 in the figure, the air flow does not become smooth as shown by the arrow in FIG. This has led to problems such as a reduction in the amount of air blow or generation of noise. SUMMARY OF THE INVENTION Accordingly, the present invention provides a blower for a vehicle air conditioner which can reduce the amount of air blown into a vehicle interior and prevent noise generation without increasing the operating angle of an inside / outside air switching damper. With the goal. In order to achieve the above object, the present invention provides a blower case having an inside air suction port and an outside air suction port, a blower case disposed in the blower case, and the inside air suction port. An inside / outside air switching damper that opens and closes an opening and the outside air intake port, a damper shaft rotatably supported by the blower case and connected to the inside / outside air switching damper, and a damper shaft provided downstream of the inside / outside air switching damper. And a fan whose own center is shifted to the left or right with respect to the damper shaft, and a fan that blows air into the vehicle interior by its own rotation, and a downstream of the inside / outside air switching damper and an upstream of the fan And a partition wall formed with a circular opening for taking the air from the inside air intake port or the outside air intake port into the fan. And a part of the inside / outside air switching damper swells in a bowl shape in one direction along the circular shape of the circular opening. According to the present invention, when the inside / outside air switching damper closes one of the inside air suction port and the outside air suction port, the bowl-shaped portion of the inside / outside air switching damper is partitioned by a partition. Since the circular opening is opened along the circular shape of the circular opening formed in the wall, air from the inside air intake port or the outside air intake port can smoothly pass through almost all of the circular opening. As a result, it is possible to prevent a reduction in the amount of air blown into the vehicle interior and the generation of noise. As described above, according to the present invention, a reduction in the amount of air blown into the vehicle interior and the generation of noise are prevented.
The interior of the vehicle can be placed in a comfortable air-conditioned state. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention. In one embodiment of the present invention, as shown in FIG. 1, an outside air suction port 2 and an inside air suction port 3 are formed in a blower case 1. In the blower case 1, a damper shaft 5 rotatably disposed with respect to the blower case 1 and connected to the inside / outside air switching damper 4 is disposed in a direction perpendicular to the plane of the drawing. The inside / outside air switching damper 4 alternately opens and closes the outside air suction port 2 and the inside air suction port 3 to suck air from inside air or outside air. Downstream of the inside / outside air switching damper 4 is provided a sirocco fan 7 driven by the rotation of a blower motor 6 to blow air into the vehicle interior. The center 7a of the sirocco fan 7 is shifted to the left with respect to the damper shaft 5. This shift (offset) is denoted by A as shown in the figure. A partition wall 8 is provided upstream of the sirocco fan 7 and downstream of the inside / outside air switching damper 4. The partition wall 8 is formed with a circular opening 9 (bell mouth) for smoothly taking air from the outside air suction port 2 or the inside air suction port 3 into the sirocco fan 7. In one embodiment, a part of the surface of the damper 4 is provided with an inflated portion in one direction along the circular shape of the circular opening 9. This is shown in FIG. As shown in FIG. 2B, the inside / outside air switching damper 4 includes a damper body 4a and a packing 4b for sealing. An inflated portion 10 is formed on a part of the surface of the damper 4, and the curvature of the inflated portion 10 in the direction perpendicular to the sheet of FIG.
Is substantially equal to the curvature of the circular opening 9 indicated by. Next, the operation of the above configuration will be described. When the inside / outside air switching damper 4 is in the position indicated by the two-dot chain line in FIG. 1, that is, in the inside air mode in which the outside air intake port 2 is closed, the bulging portion 10 of the damper 4 moves through the circular opening 9 of the partition wall 8 and its circle. Open along the shape. FIG. 3 shows the positional relationship between the bulging portion 10 and the circular opening 9 at this time. Here, FIG. 3 is a schematic diagram schematically showing the positional relationship between the bulging portion 10 of the damper 4 and the circular opening 9 when the apparatus of FIG. 1 is viewed from below in the figure. By providing the inflated portion 10 in the inside / outside air switching damper 4 as in one embodiment, the inflated portion 10 is provided.
The gap (dimension C in the figure) between the front end 11 of FIG. 1 and the left end of the circular opening 9 in FIG. 1 can be made smaller than the conventional gap (dimension B in the figure). That is, the opening area of the circular opening 9 is not reduced by the damper 4, so that the air from the inside air inlet 3 can pass through almost the entire surface of the circular opening 9, so that the amount of air blown into the vehicle interior decreases. Can be eliminated. Further, as shown in FIG.
1 and the curvature of the circular opening 9 are substantially equal.
Is smoothly introduced into the circular opening along the curvature of the inflated portion. As a result, generation of noise can be suppressed. Even when the inside / outside air switching damper 4 is at the position indicated by the solid line in FIG. 1, that is, in the outside air mode in which the inside air suction port 3 is closed, the opening area of the circular opening 9 is not reduced by the bulging portion 10. Absent. This is because the damper shaft 5 is shifted from the center 7a of the sirocco fan 7 to the right side in the figure by the dimension A in the first place. That is, when the damper 4 closes the inside air suction port 3, the position of the tip 12 of the damper 4 is shifted to the right side in the figure with respect to the circular opening 9, so that the expansion formed on the left side of the damper 4 slightly in the figure. The leading end 11 of the only portion 10 is located at a position substantially facing the right end of the circular opening 9 in the drawing. In the above-described embodiment, the case where the center of the sirocco fan 7 is shifted to the left side in FIG. 1 with respect to the damper shaft 5 is described. . In this case, if the bulging direction of the bulging portion is set to the inside air suction port 3 side opposite to the embodiment, the same effect as in the embodiment can be obtained. In the above embodiment, a sirocco fan is used as a fan. However, a similar effect can be obtained by using a turbo fan.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of the present invention. 2A is a front view of an inside / outside air switching damper used in the embodiment, FIG. 2B is a right side view of FIG. 2A, and FIG. 2C is a side view of the inside / outside air switching damper. It is a perspective view. FIG. 3 is a schematic diagram schematically showing a positional relationship between a bulge portion and a circular opening when the device of FIG. 1 is viewed from below in the figure. FIG. 4 is a cross-sectional view showing a blower of a conventional vehicle air conditioner. FIG. 5 is a schematic diagram showing a flow of air in the conventional device. [Description of Signs] 1 Blower case 2 Outside air suction port 3 Inside air suction port 4 Inside / outside air switching damper 5 Damper shaft 7 Sirocco fan 8 Partition wall 9 Circular opening 10 Inflated part

Claims (1)

(57) Claims 1. A blower case having an inside air suction port and an outside air suction port, and disposed in the blower case and opening and closing the inside air suction port and the outside air suction port. An inside / outside air switching damper; a damper shaft rotatably supported by the blower case and connected to the inside / outside air switching damper; a damper shaft provided downstream of the inside / outside air switching damper, and a center of the damper A fan that is displaced to the left or right with respect to the shaft, and that blows air into the vehicle cabin by its own rotation, disposed at a portion downstream of the inside / outside air switching damper and upstream of the fan, and A partition wall formed with a circular opening for taking in the air from the inside air suction port or the outside air suction port into the fan, and a part of the inside / outside air switching damper Blows in a bowl shape in one direction along the circular shape of the circular opening.