JPH08230452A - Blow-out device for air conditioner for car - Google Patents

Abstract

PURPOSE: To provide a blow-out device for an air conditioner for car, with which it is possible to preclude generation of wind cutting sounds from a shutter valve. CONSTITUTION: A blow-out device for an air conditioner for car is equipped with a shutter valve 2 held in the body 1 of an air conditioner case in such a way as capable of opening and closing and a seal material 4 which is installed at the shutter valve 2, whose upper and lower edges 5, 6 are put in slide contact with the inner surface of the case body 1 at the time of full closing, and lower edge 6 approaches the rear edge 3a of a housing 3, wherein surface unevenness is provided at the lower edge 6 of the seal material 4 of the shutter valve 2.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A conventional blowout device for a vehicle air conditioner will be described below.

As shown in FIG. 14, when the air conditioning case body 1 is fully closed, the upper edge 2a is located on the supply duct side behind the air conditioning case body 1, and the lower edge 2b is the rear edge 3a of the housing 3 on the outlet side. BACKGROUND ART A blowout device for a vehicle air conditioner in which shutter valves 2 located close to each other are horizontally mounted is known.

[0004]

However, in the structure of the vehicle air conditioner of this type, the flow velocity of the airflow F passing through the lower edge 2b of the shutter valve 2 is high immediately before the shutter valve 2 is completely sealed. The blown air flow vibrates according to the law of nature, and the rear edge 3 of the housing 3
There is a problem that a vortex flow a is generated upon hitting a, and an edge sound and an aeolian sound (aerodynamic sound), which are annoying wind noises, are generated.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a blowing device for an air conditioner for a vehicle, which prevents the generation of wind noise due to a shutter valve.

[0006]

In order to achieve this object, a blowing device for an air conditioner for a vehicle according to the present invention is provided with a shutter valve that is openably and closably held in an air conditioning case body, and is attached to the shutter valve. In a blowing device for a vehicle air conditioner, the upper and lower edges of which are in sliding contact with the inner surface of the air conditioning case when fully closed, and the lower edge of which is close to the rear edge of the housing. It has the structure which formed the part.

[0007]

With this configuration, Karman vortices having different frequencies are generated in the air currents having different flow velocities generated by the uneven portions formed on the sealing material of the shutter valve, so that the mutual Karman vortices are offset to each other, and the silencing effect is obtained. . In addition, the Karman vortex, which is the sound source, is disturbed because a vortex with another frequency generated by the vortex flow generation structure arranged on the inlet side of the air conditioning case is added to the Karman vortex generated after the airflow passes through the shutter valve. Wind noise can be muted.

[0008]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings. The same parts as those shown in the conventional example are designated by the same reference numerals.

FIG. 1 is a sectional view of a blowout device for a vehicle air conditioner in the first embodiment, and FIG. 2 is a perspective view of a shutter valve. In the figure, 1 is an air conditioning case, 2 is a shutter valve, and 4 is a sealing material.

As shown in FIGS. 1 and 2, a housing 3 for changing the wind direction is rotatably held in front of the air conditioning case body 1 (to the left in the drawing). Further, a shutter valve 2 is mounted in the air conditioning case body 1 so as to pivot from a horizontal fully open position to a fully closed position shown in the drawing to open and close a passage of the air flow F. Sealing material 4 is attached to both ends of the shutter valve 2, and a continuous trapezoidal uneven portion 7 is formed on a lower edge 6 of the sealing material 4.
When the shutter valve 2 is fully closed, the sealing material 4
The upper end edge 5 and the lower end edge 6 are set to be in sliding contact with the inner surface of the air conditioning case body 1, respectively.

The operation of the blowing device of the vehicle air conditioner configured as above will be described.

As shown in FIG. 3, when the housing 3 is particularly downward (position A), when the shutter valve 2 is moved from the fully open position to the vicinity of the fully closed position (position B), the sealing material 4 is provided.
The upper and lower edges 5 and 6 are in sliding contact with the inner surface of the air conditioning case body 1, and at the same time, the lower edge 6 is close to the rear edge 3 a of the housing 3.
At this time, a Karman vortex is generated near the rear edge 3a of the housing 3 after the airflow F passes through the lower edge of the shutter valve 2, but a trapezoidal uneven portion 7 continuous to the lower edge 6 of the sealing material 4 is formed.
Therefore, two kinds of air currents having different flow velocities are generated in the concave portion 7a and the convex portion 7b, and Karman vortices a and b having different frequencies are generated in the air currents.
Cancels each other to create a sound-deadening effect and prevent wind noise.

FIGS. 4 to 6 are perspective views of another seal member 4 having variously shaped irregular portions. FIG. 4 shows a corrugated uneven portion 1.
1, FIG. 5 is a sawtooth-shaped uneven portion 12, and FIG. 6 is a dovetail-shaped uneven portion 13.
An example of the sealing material 4 provided with is shown.

(Embodiment 2) FIG. 7 is a perspective view of an air conditioning case body of a blowout device of a vehicle air conditioner in a second embodiment.
As shown in the drawing, the formation of the uneven portion 7 of the sealing material 4 of the shutter valve 2 is the same as that of the first embodiment, but the grid-shaped ridges 8 parallel to the air flow direction are provided on the duct connection side of the air conditioning case body 1.
The eddy current generating structure consisting of
8a has a tapered shape.

Next, the operation of this blowing device will be described.

As shown in FIG. 8, a vortex b having a different frequency due to the uneven portion 7 of the seal member 4 is added to the Karman vortex a generated after the air flow F passes through the lower edge of the shutter valve 2.
In addition to these two types of Karman vortices a and b, a vortex flow generating structure 8
Since the vortex c generated by is added, the silencing effect is further improved.

FIG. 9 shows the experimental data. As can be seen from this data, an annoying wind noise is generated at the position immediately before the shutter valve 2 is fully closed.
There is a considerable sound deadening effect only by forming the above structure, and the sound deadening effect is further improved by providing the vortex flow generating structure 8 in the air conditioning case body 1.

10 to 13 are perspective views of another vortex flow generating structure 8 having various shapes. In FIG. 10, the center is divided by a horizontal rail 14, and a grid 15 is provided under the partition.
In FIG. 11, a baffle plate 16 is erected at the entrance of the air conditioning case body 1. Further, FIG. 12 shows a net 17 stretched instead of the lattice of FIG. 10, and FIG. 13 shows a zigzag lattice 18 provided instead of the net of FIG.

[0019]

As described above, according to the present invention, the shutter valve which is openably and closably held in the air conditioning case body, and the shutter valve which is attached to the shutter valve, has its upper and lower edges slidably contacting the inside surface of the air conditioning case when fully closed. In a blowing device of an air conditioner for a vehicle, which comprises a sealing material whose lower end edge is close to a rear edge of the housing, by forming an uneven portion on the lower end edge of the sealing material of the shutter valve, different flow velocities caused by the uneven portion are formed. Since Karman vortices with different frequencies are generated in the air flow, the mutual Karman vortices are canceled out, and a sound deadening effect is obtained. In addition, since a vortex having another frequency generated by the vortex generation structure is added to the Karman vortex generated after the airflow passes through the shutter valve, it is possible to disturb the Karman vortex that is the sound source and muffle the wind noise. An air conditioner blowout device is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a blowing device for a vehicle air conditioner according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a shutter valve of the blowing device of the vehicle air conditioner.

FIG. 3 is an operation explanatory view of the blowing device of the vehicle air conditioner.

FIG. 4 is a perspective view of another shutter valve having a wave-shaped uneven portion.

FIG. 5 is a perspective view of another shutter valve in which the saw-toothed concavo-convex portion is formed.

FIG. 6 is a perspective view of another shutter valve in which the dovetail-shaped uneven portion is formed.

FIG. 7 is a perspective view of a rear portion of an air conditioning case body of a blowing device for a vehicle air conditioner according to a second embodiment of the present invention.

FIG. 8 is an operation explanatory view of the blowing device of the vehicle air conditioner.

FIG. 9 is a chart showing experimental data of a blowing device of the vehicle air conditioner.

FIG. 10 is a perspective view of another eddy current generation structure in which the horizontal rail and the grid are formed.

FIG. 11 is a perspective view of another eddy current generation structure in which the baffle plate is formed.

FIG. 12 is a perspective view of another eddy current generation structure forming the net.

FIG. 13 is a perspective view of another eddy current generation structure having the same zigzag grid.

FIG. 14 is an operation explanatory view of a conventional blowout device for an air conditioner for a vehicle.

[Explanation of symbols]

 1 Air-conditioning case body 2 Shutter valve 3 Housing 4 Sealing material 5 Upper edge 6 Lower edge 7 Concavo-convex portion 8 Lattice-shaped protrusions (vortex flow generation structure)

Claims (2)

[Claims] 1. A shutter valve that is openably and closably held in the air conditioning case, and is attached to the shutter valve so that the upper and lower edges are in sliding contact with the inside of the air conditioning case and the lower edge is the rear edge of the housing when fully closed. A blowing device for an air conditioner for a vehicle, comprising: a sealing material adjacent to each other, wherein a concavo-convex portion is formed on a lower end edge of the sealing material for the shutter valve. 2. The blowout device for an air conditioner for a vehicle according to claim 1, wherein a vortex flow generating structure is disposed on the inlet side of the air conditioning case body.