JPS6244263Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wind direction plate drive device for an air outlet,
In particular, the present invention relates to a drive device that causes a wind direction plate to perform an extremely smooth periodic oscillating motion using air pressure from an air pressure source.

BACKGROUND ART Conventionally, a device having the following structure has been used as a device for driving a wind direction plate of an air outlet used in an air conditioner for an automobile or the like. That is, a pneumatic operating mechanism such as a diaphragm is caused to reciprocate by alternately switching between negative pressure from a negative pressure source such as an engine manifold and atmospheric pressure using a response valve such as a pachyume switch mechanism consisting of a piston and a cylinder. This automatically caused the wind direction plate to oscillate. When switching between the negative pressure port and the atmospheric pressure port of the vacuum switch mechanism, the piston is mechanically moved by a lever that moves in conjunction with the movement of the wind direction plate. It was something that would be manipulated.

However, if the negative pressure from the negative pressure source is directly applied to the pneumatic actuating mechanism, the swinging movement of the wind direction plate will pass quickly, and the air pressure flow path between the pneumatic actuating mechanism and the vacuum switch mechanism will It was necessary to provide an orifice to dampen sudden changes in air pressure in the pneumatically actuated mechanism.
As a result, the movement speed of the piston in the vacuum switch mechanism becomes slow, and there are times when the piston remains blocking the negative pressure port and no negative pressure is applied, which stops the movement of the wind direction plate. This resulted in a major drawback, as it became impossible to start the engine again.

The present invention has been developed in view of the above-mentioned circumstances, and the problem is that the response valve blocks the air pressure outlet of the air pressure source during the swinging movement of the wind direction plate, causing the operation of the wind direction plate to stop. It is an object of the present invention to provide a wind direction plate drive device that enables smooth and reliable swinging movement of the wind direction plate.

In order to achieve this object, the present invention automatically oscillates the wind direction plate of the air outlet in accordance with the reciprocating motion of the pneumatic operating mechanism that is activated depending on whether or not air pressure is applied. On the other hand, the air pressure from the pneumatic source applied to the pneumatic actuation mechanism is periodically released to the atmosphere by a response valve consisting of a piston and a cylinder, which is mechanically actuated in response to the movement of the wind direction plate. , in a wind direction plate drive device configured to alternately apply and non-apply pneumatic pressure to the pneumatic actuating mechanism, an orifice is provided on the pneumatic flow path between the pneumatic actuating mechanism and the response valve; A pressure accumulating means is provided between the orifice and the response valve to alleviate sudden changes in air pressure in the mechanism, and the air pressure from the air pressure source is temporarily stored in the pressure accumulating means. It is something to do.

Thus, according to the present invention, an orifice is provided on the pneumatic flow path between the pneumatic actuation mechanism and the response valve, and a pressure accumulating means for temporarily storing air pressure is provided between the orifice and the response valve. As a result, a pressure difference is temporarily maintained between the pneumatic actuating mechanism and the pressure accumulating means. This eliminates the situation where the wind direction board remains blocked and the swinging motion of the wind direction board is stopped, and it becomes possible to continue the reliable swinging motion of the wind direction board smoothly.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an air direction plate driving device for an air outlet according to the present invention will be described in detail with reference to the drawings.

First, in FIG. 1, reference numeral 2 is an air outlet of an air conditioner for an automobile, and an appropriate number of wind direction plates are provided rotatably around a support shaft 4 erected at the air outlet 2. 6 is pivoted at each end on the same side by a pin 8 to a connecting plate 10, which in turn is pivoted to a rod 14 by a pin 12. A telescoping diaphragm 18 of a diaphragm mechanism 16 serving as a pneumatic actuation mechanism is connected to the rod 14. Therefore, when the rod 14 moves left and right in FIG. 1 due to expansion and contraction of the diaphragm 18, the connecting plate 10 is also moved left and right, and each wind direction plate 6 is rotated by a predetermined angle around the support shaft 4. It's summery. In addition, 20 is a compression coil spring, and the diaphragm 18
The diaphragm 18 is located in the negative pressure chamber 21 on the left side (FIG. 1) and is constantly biased to push the diaphragm 18 to the right.

An arm 22 erected on the rod 14 is inserted into a long hole 28 at the end of a rod 26 (piston) fitted in a vacuum switch 24 as a response valve. As shown in FIG. 2, the vacuum switch 24 has a negative pressure port 30 connected to the negative pressure source 29 and a connection port 32 connected to the diaphragm mechanism 16.
An O-ring 36 is fitted into each of the two ring-shaped grooves 34 provided to maintain the air pressure.This allows the rod 26 to airtightly move inside the cylinder 38 of the vacuum switch 24, whose both ends communicate with the atmosphere. It is designed so that it can be slid easily. Note that the distance L is set to be slightly larger than the axial center distance R between the ports 30 and 32.

The negative pressure port 30 is connected to the negative pressure source 2 via a normal ON-OFF switch 42 via a pipe 40.
9 (engine manifold),
The connection port 32 includes a pipe 44, a surge tank 46, a pipe 54, an orifice 48, and a pipe 5.
6 to the negative pressure inlet 50 of the diaphragm mechanism 16
It is connected to. This surge tank 4
6 (pressure accumulating means) is simply a cylindrical air reservoir that is compressed when the air pressure is high and expands when the pressure is low, and serves to temporarily store air and adjust the air pressure. This is a normal regulating valve that regulates the flow rate of air.

In the wind direction plate driving device for the air outlet configured in this way, as shown in FIG. , through the connection port 32, and further via the pipe 44 to the surge tank 46, the pipe 54, the orifice 48, and the pipe 5.
6, the negative pressure chamber 21 is reached through the negative pressure introduction port 50, and negative pressure is applied thereto. At this time, surge tank 4
6 and orifice 48, this negative pressure chamber 2
1 is slowly changed from the initial atmospheric pressure state to negative pressure.

In this way, when the negative pressure chamber 21 reaches a predetermined level of negative pressure, the diaphragm 18 contracts to the left against the biasing force of the compression coil spring 20 due to the pressure difference, and the rod 14 and, by extension, the connecting plate 10 also move to the left. As a result, the wind direction plate 6 is rotated counterclockwise. (Figure 3).

Then, when the rod 14 moves to the left by a predetermined amount, the arm 22 moves toward the rod 2 as shown in FIG.
When the rod 14 contacts the left end of the elongated hole 28 of 6 and further moves to the left, the arm 22 moves the rod 26 to the left, as shown by the dotted line, and the right O-ring 36 reaches above the opening 52 of the connection port 32 and closes the opening 52. Then, the negative pressure is cut off at the opening 52 and does not reach the surge tank 46, the orifice 48, and the negative pressure chamber 21. However, because there is an orifice 48, the moment the hole is closed, the surge tank 46
The pressure in the negative pressure chamber 21 is a pressure P ₁ which is equal to that of the negative pressure source 29, while the pressure in the negative pressure chamber 21 is a pressure P ₂ intermediate between the negative pressure of the negative pressure source 29 and atmospheric pressure. Therefore, the pressure in the negative pressure chamber 21 changes from P ₂ to P ₃ after the opening 52 is closed.

That is, _P3 = ( _P1V1 + _P2V2 ) / _V1 + _V2 , where _V1 is the volume of the surge tank ₄₆ and _the pipe 44, and _V2 is the volume of the negative pressure chamber 21 and the pipe 54 and the pipe 55.
In this way, the negative pressure in the negative pressure chamber 21 changes from _P2 to _P3 even after the opening 52 is closed, so that the rod 14 is pushed leftward in accordance with this change in pressure, and therefore the O-ring 36 overcomes the opening 52 and is moved to the left of the opening 52 (the position of the O-ring shown by the dotted line). Then, the opening 52 is opened to the atmosphere.

In this way, when the connection port 32 is opened to the atmosphere, the pressure in the negative pressure chamber 21 gradually approaches atmospheric pressure, and the diaphragm 18 is stretched to the right by the biasing force of the compression coil spring 20, as shown in FIG. As shown, the rod 14 and the connecting plate 10 are moved to the right and the wind direction plate 6 is rotated clockwise. When the arm 22 comes into contact with the right end of the elongated hole 28 and then pushes the rod 26 to the right, the O-ring 36 closes the opening 52. At this time, the pressure in the surge tank 46 is P ₀ equal to atmospheric pressure, and the negative pressure chamber 21
Since the pressure in the negative pressure chamber 21 is P ₂ which is lower than the atmospheric pressure, the pressure in the negative pressure chamber 21 is further reduced to P ₂ after the opening 52 is closed.
It changes up to P ₄ .

That is, _P4 = ( _P0V1 + _P2V2 ) / _V1 + _V2 , _{where V1 and V2} are as defined above.

In this way, as the pressure in the negative pressure chamber 21 changes, the rod 14 is further pushed to the right, and the O-ring 36 is moved to the right (the O-ring position indicated by the dotted line) over the opening 52. It will be done. The diaphragm mechanism 16 is then connected to the negative pressure source 29, and the entire apparatus is returned to its original state as shown in FIG. 3.

In this way, while the ON-OFF switch 42 is turned on, the above-mentioned operation is repeated, and the wind direction plate 6 makes periodic oscillating movements at a predetermined angle in clockwise and counterclockwise directions. Not only can the swinging speed be adjusted to a suitable low speed using the orifice 48, but even if the moving speed of the rod 26 is slow, the vacuum switch 24 closes the negative pressure supply path. There is no risk of stopping the movement of the wind direction plate 6, and smooth swinging motion of the wind direction plate 6 is possible at all times.

In addition, in the above-mentioned embodiment, the air outlet of an automobile air conditioner was explained, but the present invention is not limited to this in any way. Applicable to

Further, although an example is shown in which a surge tank 46 is provided between the diaphragm mechanism 16 and the vacuum switch 24, which can appropriately adjust the air pressure, it is also possible to provide other pressure accumulating means to accumulate air pressure. It is.

Furthermore, the surge tank 46 and orifice 48
Although it is separate from the above, it can also be integrated into a compact structure. That is, as shown in FIG. 6, a small chamber 64 is provided inside the orifice side outlet 62 of the surge tank 60.
The right side wall of the surge tank 60 is made of a sintered metal plate 66 having a large number of small holes, and the surge tank 60 and the sintered metal plate 66 as an orifice are integrated.

Further, although the present invention has shown an example in which a negative pressure source 29 is applied, it is generally possible to apply a positive pressure source.

In addition, it goes without saying that various modifications and improvements can be made to the present invention based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the arrangement of an embodiment of the wind direction plate drive device according to the present invention, Fig. 2 is a sectional view of a vacuum switch, and Figs. 3 to 5 are explanatory diagrams of its operation. , Figure 3 is Bakyume Switch 2
4 shows the state immediately before the rod 26 moves from the right end to the left, and FIG.
Figure 5 shows the state immediately before the rod 26 closes the frontage 5 and moves further to the left.
2 is a diagram illustrating a state immediately before the robot moves further to the right. FIG. 6 is a sectional view of another embodiment of the present invention in which a surge tank and an orifice are integrated. 2: Air outlet, 6: Wind direction plate, 10: Connection plate,
14: Rod, 16: Diaphragm mechanism (pneumatic actuation mechanism), 24: Vacuum switch (response valve), 26: Rod (piston), 29: Negative pressure source (air pressure source), 30: Negative pressure port, 32: Connection Port, 38: Cylinder, 46, 60: Surge tank (pressure accumulation means), 48: Orifice, 66: Sintered metal (orifice).

Claims (1)

[Claims for Utility Model Registration] (1) The wind direction plate of the air outlet is automatically oscillated in accordance with the reciprocating motion of a pneumatic operating mechanism that is activated depending on whether or not air pressure is applied; The air pressure from the air pressure source applied to the pneumatic actuation mechanism is periodically released to the atmosphere by a response valve consisting of a piston and cylinder that is mechanically actuated in response to the movement of the wind direction plate, and the air pressure is In a wind direction plate drive device configured to alternately apply and non-apply pneumatic pressure to an operating mechanism, an orifice is provided on a pneumatic flow path between the pneumatic operating mechanism and the response valve, so that the pneumatic pressure in the pneumatic operating mechanism is controlled. The air blower is characterized in that a pressure accumulation means is provided between the orifice and the response valve, and the air pressure from the air pressure source is temporarily stored in the pressure accumulation means. Exit wind deflector drive. (2) The device according to claim 1, wherein the pressure accumulating means is a surge tank. (3) The device according to claim 1 or 2, wherein the orifice and the pressure accumulating means are constructed separately or integrally.