JPH05155234A - Blast device for air conditioner of car - Google Patents

Abstract

PURPOSE:To provide a car air conditioner which can prevent a reduction in blast quantity into a car room and control the occurrence of noise without enlarging the working angle of a damper. CONSTITUTION:A swelled part 10 is formed at a part on the surface of an inside-outside air changing over damper 4. The form of the swelled part 10 is set up to have the almost same curvature as that of a circular opening part 9. Thus, when the damper 4 takes its position in a two-dot chain line in the drawing, the damper 4 can not reduce the opening area of the circular opening part 9, and blast quantity into a car room therefore does not decrease. In addition, since air entering at an inside-air suction port 3 flows smoothly along the curved face of the swelled part to the circular opening part, the occurrence of noise can be controlled.

Description

Detailed Description of the Invention

[0001]

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 the shape of an inside / outside air switching damper.

[0002]

2. Description of the Related Art A conventional air conditioning system for a vehicle has a
As shown in FIG. 4, in some cases, the damper shaft 5 of the inside / outside air switching damper 4 is displaced to the left or right with respect to the center 7a of the sirocco fan 7 (dimension A in the figure). Further, when the shaft 5 is displaced with respect to the center 7a of the sirocco fan 7 in this way, the tip portion 1 of the damper 4 is
A deviation (dimension B in the drawing) also occurs between 2 and the left end of the circular opening 9 in the drawing.

[0003]

As described above, the damper 4 is
When there is a deviation (dimension B) between the tip portion 12 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 indicated by the chain double-dashed line in the figure. In the inside air mode, the tip portion 12 of the damper 4 reduces the opening area of the circular opening 9, which increases the ventilation resistance in the opening 9 and, as a result, reduces the amount of air blown into the vehicle interior. Or there was a problem that the noise increased.

Here, it is conceivable to increase the operating angle θ of the damper 4 so as not to reduce the opening area of the circular opening 9 in the inside air mode, but in this case, the tip portion 12 of the damper 4 is naturally used. Therefore, the sirocco fan 7 sucks in air through the gap between the damper tip portion 12 and the blower case 1a portion as a result. Therefore, in order to prevent this, it becomes necessary to provide a wall for filling the gap between the portion 1a and the damper tip portion 12. On the contrary, when the outside air mode shown by the solid line in the figure is entered, this wall causes ventilation resistance, which reduces the amount of air blown into the passenger compartment. Four
It is not possible to increase the operating angle θ of.

If there is a deviation (dimension B) between the damper tip 12 and the left end of the circular opening 9 in the figure, the air flow will not be smooth as shown by the arrow in FIG. However, this has caused problems such as a reduction in air flow or noise generation.

Therefore, the present invention provides a blower for an air conditioner for a vehicle, which can reduce the amount of blown air into the passenger compartment and prevent noise without increasing the operating angle of the inside / outside air switching damper. With the goal.

[0007]

In order to achieve the above object, the present invention provides a blower case having an inside air intake port and an outside air intake port, the inside air intake port and the inside air intake port and the inside air intake port. An inside / outside air switching damper that opens and closes an outside air intake port, a damper shaft rotatably supported with respect to the blower case and connected to the inside / outside air switching damper, and provided downstream of the inside / outside air switching damper, and The center of itself is offset to the left or right with respect to the damper shaft, and a fan that blows air into the passenger compartment by its rotation, and a portion that is 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 intake port or the outside air intake port into the fan, and Some of the serial in outside air switching damper is its gist the blower of a vehicular air conditioner which bulges bowl type in one direction along the circular of the circular opening.

[0008]

In the present invention, when the inside / outside air switching damper closes one of the inside air intake port and the outside air intake port, the bowl-shaped bulging portion of the inside / outside air switching damper is formed on the partition wall. Since the circular opening is opened along the circular shape of the formed circular opening, the air from the inside air inlet or the outside air inlet can smoothly pass through almost all of the circular opening. As a result, it is possible to prevent a decrease in the amount of air blown into the vehicle interior and the generation of noise.

[0009]

As described above, according to the present invention, the reduction of the amount of air blown into the passenger compartment and the generation of noise are prevented.
The vehicle interior space can be brought to a comfortable air conditioning state.

[0010]

Embodiments 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, a blower case 1 is formed with an outside air suction port 2 and an inside air suction port 3. Further, inside the blower case 1, a damper shaft 5 rotatably arranged with respect to the blower case 1 and connected to an inside / outside air switching damper 4 is arranged in a direction perpendicular to the paper surface. Then, 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 the inside air or the outside air.

Downstream of the inside / outside air switching damper 4, a sirocco fan 7 is provided which is 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 displaced to the left with respect to the damper shaft 5. The amount of this offset (offset) is A as shown in the figure.

A partition wall 8 is provided at a portion upstream of the sirocco fan 7 and downstream of the inside / outside air switching damper 4. Further, the partition wall 8 is formed with a circular circular opening 9 (bell mouth) for smoothly taking in air from the outside air intake port 2 or the inside air intake port 3 into the sirocco fan 7.

In one embodiment, a bulge portion having a shape along the circular shape of the circular opening 9 is provided in one direction on a part of the surface of the damper 4. This is shown in FIG. As shown in FIG. 2B, the inside / outside air switching damper 4 includes a damper body 4a and a seal packing 4b. A bulge portion 10 is formed on a part of the surface of the damper 4, and the curvature of the bulge portion 10 in the direction perpendicular to the paper surface of FIG.
It is almost 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 at the position indicated by the chain double-dashed 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 causes the circular opening 9 of the partition wall 8 to form a circle. Open along the shape. The positional relationship between the bulge portion 10 and the circular opening 9 at this time is shown in FIG. Here, FIG. 3 is a schematic diagram schematically showing the positional relationship between the expanded portion 10 of the damper 4 and the circular opening 9 when the apparatus of FIG. 1 is viewed from below in the drawing.

As in one embodiment, the expansion portion 10 is provided in the inside / outside air switching damper 4 so that the expansion portion 10 is expanded.
The gap (dimension C in the figure) between the tip portion 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). In other words, the damper 4 does not reduce the opening area of the circular opening 9, and therefore the air from the inside air inlet 3 can pass through almost the entire surface of the circular opening 9, thus reducing the amount of air blown into the vehicle interior. Can be eliminated.

Further, as shown in FIG. 3, the bulge portion 10
1 and the curvature of the circular opening 9 are substantially equal,
The air from the inside air suction port 3 is smoothly introduced into the circular opening along the curvature of the bulging portion. As a result, generation of noise can be suppressed.

Even when the inside / outside air switching damper 4 is in the position shown by the solid line in FIG. 1, that is, in the outside air mode in which the inside air inlet 3 is closed, the expansion area 10 does not reduce the opening area of the circular opening 9. Absent. This is because the damper shaft 5 is originally displaced from the center 7a of the sirocco fan 7 by the dimension A on the right side in the drawing. That is, when the damper 4 closes the inside air intake port 3, the position of the tip portion 12 of the damper 4 shifts to the right side in the figure with respect to the circular opening 9, so that the expansion formed slightly to the left side of the damper 4 in the figure. The tip portion 11 of the only portion 10 is at a position facing the right end portion of the substantially circular opening 9 in the drawing.

Further, in the above embodiment, the case where the center of the sirocco fan 7 is displaced to the left side in FIG. 1 with respect to the damper shaft 5 has been described, but it can be applied to the case where the center is displaced to the right side. .. In this case, the same effect as that of the first embodiment can be obtained by setting the direction of bulge of the bulge portion to the inside air suction port 3 side, which is the opposite of that of the first embodiment.

Further, although the sirocco fan is used as the fan in the above embodiment, the same effect can be obtained by using a turbo fan.

[Brief description of 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. 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 apparatus of FIG. 1 is viewed from below in the figure.

FIG. 4 is a cross-sectional view showing a conventional air blower for a vehicle air conditioner.

FIG. 5 is a schematic diagram showing the flow of air in the conventional device.

[Explanation of symbols]

 1 Blower case 2 Outside air intake port 3 Inside air intake port 4 Inside / outside air switching damper 5 Damper shaft 7 Sirocco fan 8 Partition wall 9 Circular opening 10 Expansion part

Claims (1)

[Claims] 1. A blower case having an inside air intake port and an outside air intake port, an inside / outside air switching damper disposed in the blower case and opening / closing the inside air intake port and the outside air intake port, and the blower case. A damper shaft that is rotatably supported with respect to the inside and outside air switching damper, and a damper shaft that is provided downstream of the inside and outside air switching damper and whose center is offset 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 fan that is arranged downstream of the internal / external air switching damper and upstream of the fan, and that has the internal air intake port or the external air intake port. A partition wall formed with a circular opening for taking in the air from the inside into the fan, and a part of the inside / outside air switching damper is a circle of the circular opening. Blower apparatus for a vehicle air-conditioning system, characterized in that bulges bowl type in one direction along the Jo.