JPH09209960A - Valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the machinability of a valve seal mechanism part and facilitate the miniaturization of a valve by the simplification of a structure. SOLUTION: A doughnut plate shape elastic sheet 6 having a communication hole 8 for communicating a flow in port 10 with a valve room 2 is mounted and fixed on the bottom surface of the valve room 2 of the circumference of a fluid flow in port 10 installed on the bottom wall of the valve room 2. The valve seat 7 is made by the surface part of the valve room 2 side of this elastic sheet 6 and also push-pressed and stored to the valve seat 7 side by a spring so as to form the valve body 3 in the valve room 2 vertically and movably and a valve seal mechanism between the valve seat 7 and valve body. When a projection part 3a for constituting the valve seal mechanism is installed, it is installed on the bottom surface of the valve body 3 or valve seat 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve such as a relief valve, a closing valve, a check valve or the like used in a vehicle compressor.

[0002]

2. Description of the Related Art As a valve used in a conventional vehicle compressor or the like, for example, a relief valve as shown in FIG. 3 is known. As shown in FIG. 3, the valve body 51 of this relief valve is composed of a hexagonal bolt head-shaped portion 51a and a screw portion 51b. The threaded portion 51b is a gasket 63.
Through a housing 61 forming a high pressure chamber 62 of the compressor. Then, the relief valve is fixed to the housing 61 by this screwing.

On the other hand, a valve chamber 52 is formed inside the valve body 51, and a valve seat 57 consisting of an annular convex portion 57a is formed inside the bottom surface of the valve chamber 52. This valve seat 57 is the inlet 6
0 to the high pressure chamber 62. Further, inside the valve chamber 52, a valve body 53 having a rubber disc-shaped sheet 56 mounted on the bottom surface and a spring 55 for constantly pressing the valve body 53 toward the valve seat 57 are housed. . The spring 55 is supported by a disk 54 fitted to the valve body 51, and its spring force pushes the valve body 53 against the valve seat 57 against the gas pressure of the high pressure chamber 62 in a steady state. It is set to the extent that Therefore, the rubber disk-shaped elastic sheet 56 mounted on the bottom surface of the valve body 53 is attached to the valve seat 57.
The airtightness is maintained by being pressed by the convex portion 57a. The valve seal mechanism of the conventional valve is constructed as described above.

In such a structure, when the gas pressure in the high pressure chamber 62 rises to a predetermined value or more during the operation of the compressor, the gas pressure from the inflow port 60 overcomes the pressing force of the spring 55, and the valve Push the body 53 upwards. As a result, the high pressure chamber 62 is opened to the atmosphere through the relief hole 59 provided in the valve chamber 52 and the disk 54, and the abnormal pressure rise in the high pressure chamber 62 is prevented.

On the other hand, recent relief valves have been downsized in response to the demand for downsizing of vehicle compressors. For example, the height of the convex portion 57a of the valve seat 57 is 1 mm or less and the width thereof is about 0.5 mm, which is extremely small. For this reason, high precision has come to be required regarding the processing of the valve seat portion, for example, the surface roughness.

However, as described above, the conventional valve has the valve seat 57.
Since it is inside the bottom surface of the valve chamber 52, it was necessary to process at the bottom of the deep cylindrical hole. Therefore, workability is poor and there are many problems in securing the processing accuracy. Further, since the disk-shaped elastic sheet 56 is attached and fixed to the bottom surface of the valve body 53, a complicated circular process is required to form a shallow circular recess on the bottom surface of the valve body 53 and press-fit and adhere the elastic sheet 56 to this recess. I was trying.

The present invention has been made by paying attention to the problems existing in such conventional techniques. An object of the invention is to provide a valve having a valve seal mechanism having a simple structure and good workability.

[0008]

In order to achieve the above object, in the invention described in claim 1, a valve chamber is formed inside the valve body, and a fluid inlet is provided on the bottom wall of the valve chamber. A donut plate-shaped elastic sheet having a communication port for communicating the inflow port and the valve chamber is attached and fixed to the bottom surface of the valve chamber around the inflow port, and the surface portion of the elastic sheet on the valve chamber side is the valve seat. In addition, the valve body is housed in the valve chamber such that the valve body can be moved up and down, and is pressed toward the valve seat by spring pressure or the like so as to form a valve seal mechanism between the valve body and the valve seat. is there.

According to a second aspect of the present invention, in the valve according to the first aspect, an annular convex portion is formed on the bottom surface of the valve body, and the convex portion serves as a joint portion with the valve seat. It is a thing.

According to a third aspect of the invention, in the valve according to the first aspect, an annular convex portion is formed on the valve seat, and the convex portion serves as a joint portion with the valve body. is there.

According to the fourth aspect of the present invention, the first to third aspects are provided.
In any one of the valves described above, the communication port of the elastic sheet is made larger than the inflow port so that the elastic sheet does not protrude into the communication port.

Therefore, in the valve constructed as described above, it is not necessary to process the valve seat that requires precision finishing in the valve chamber formed inside the valve body. Particularly, in the valve according to claim 1, by mounting the elastic seat on the bottom surface of the valve chamber, a valve seat can be formed in the passage from the inlet to the valve chamber. Further, the valve seat bottom is complicated for mounting the elastic seat. Since it is not necessary to perform machining in various steps, workability is extremely improved in combination with the ease of machining the valve seat.

In the valve according to the second aspect of the present invention, since the convex portion requiring precise finishing is formed on the bottom surface of the valve body, the convex portion can be machined when the valve body is machined alone. Therefore, workability is improved and it becomes easy to secure the processing accuracy.

In the valve according to the third aspect, when the elastic sheet is molded, the convex portion may be integrally molded at the same time, and the working operation can be simplified.

In the valve according to the fourth aspect, when the fluid enters the valve chamber from the inlet, the dynamic pressure of the fluid is not applied to the elastic sheet, and the elastic sheet is not deformed or separated.

[0016]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described below with reference to FIG. This first embodiment embodies the present invention in a relief valve used in a vehicle compressor.

As shown in FIG. 1, the valve body 1 comprises a hexagonal bolt head-shaped portion 1a and a screw portion 1b. Inside thereof, a substantially cylindrical cavity is provided, and this cavity serves as a valve chamber 2. .
The bottom wall of the valve chamber 2 is provided with an inflow port 10 for a refrigerant as a fluid. Further, a donut plate-shaped elastic sheet 6 is fixed to the inside of the bottom surface of the valve chamber 2 by means such as press fitting, adhesion, baking, etc. to the valve chamber. The central hole of the elastic sheet 6 functions as a communication port 8 that connects the inflow port 10 and the valve chamber 2. The inflow port 10 and the communication port 8 are circular through holes, and the communication port 8 has a larger diameter. Further, as the material of the elastic sheet 6, a rubber product for sealing, more specifically, a material which is difficult to swell with a refrigerant, for example, hydrogenated nitrile butadiene is used.
The surface portion of the elastic seat 6 on the valve chamber 2 side is used as a valve seat 7.

The valve body 3 is housed in the valve chamber 2 above the valve seat 7 with a gap 2a left between the valve chamber 3 and the side wall of the valve chamber 7, and is constantly valved by the pressing force of the spring 5 supported by the disc 4. It is pressed toward the seat 7. In addition, the convex portion 3 is provided on the bottom surface of the valve body 3.
a is formed, and the convex portion 3a is used as a joint between the valve body 3 and the valve seat 7 to form a sealing mechanism of this valve. The disk 4 has a dish-like structure and has a plurality of small-diameter gas escape holes 9, and is caulked to an opening above the valve chamber 2.

The relief valve constructed as described above is provided with the gasket 1 with respect to the high pressure housing 11 of the vehicle compressor.
It is screwed via 3. The gasket 13 may be appropriately changed to another sealing member such as an O-ring. Therefore, the gas pressure in the high-pressure chamber 12 acts on the valve body 3 so as to oppose the pressing force of the spring 5, but in a normal operating state, the airtight seal between the valve body 3 and the valve seat 7 is maintained. When the pressure of the high pressure gas rises to a predetermined value, the spring 5
The spring force of the spring 5 is set so that the valve body 3 is pushed upward against the pressing force of.

Next, the operation of the relief valve constructed as above will be described. In the vehicular compressor using the above relief valve, when the cooling load becomes excessive due to an increase in the outside air temperature and the pressure of the high pressure gas rises to a predetermined value, the pushing force of the valve body 3 by the high pressure gas pushes the spring 5. Overcome the pressure and push the valve body 3 upward to open the valve. When the valve is opened, the high pressure gas in the high pressure chamber 12 is allowed to flow into the inlet 1.
0, the void 2a, and the valve chamber 2 to flow out from the escape hole 9 to the atmosphere, the pressure in the high-pressure chamber 12 is reduced, and the danger due to an abnormal rise in gas pressure is avoided. Then, when the pressure in the high pressure chamber 12 decreases, the pressing force of the spring 5 again overcomes the gas pressure in the high pressure chamber 12, and the valve is closed.

According to the present embodiment configured as described above, the following excellent effects are exhibited. (A) When the pressure in the high pressure chamber 12 reaches a predetermined value during the operation of the compressor, the valve body 3 of the relief valve is moved upward against the pressing force of the spring 5, and the relief valve 9 is moved from the inflow port 10 to the escape hole 9. The passage in the valve body 1 is opened, and the high-pressure gas in the high-pressure chamber 12 is released to the outside. Therefore, the risk of abnormally high pressure inside the compressor is avoided.

(B) Since the valve seat 7 is formed on the valve chamber 2 side surface of the donut plate-like elastic sheet 6 fixed to the bottom surface of the valve chamber 2, it is formed as a cylindrical hole as in the conventional case. In addition, it is not necessary to perform high-precision machining on the bottom surface of the valve chamber, the workability is remarkably improved, and the valve can be easily downsized.

(C) Since the valve seat 7 is formed on the donut plate-like elastic sheet 6 as described above and the convex portion 3a is formed on the bottom surface of the valve body 3, it is important for the valve opening / closing function of the valve. There is also the processing of the convex part that requires precise finishing,
The valve body 3 can be machined when it is machined as a single body, and in combination with the improvement of workability, high-precision finishing is ensured and the sealing function can be improved.

(D) Since the elastic sheet 6 is fixed to the bottom surface of the valve chamber 2 formed as a cylindrical hole by press fitting, bonding, baking, or the like, the elastic sheet can be stored in a conventional manner. There is no need to form parts and the structure of the valve is simplified.

(E) Since the diameter of the communication port 8 of the donut plate-shaped elastic sheet 6 is made larger than the diameter of the fluid inlet port 10 of the valve body, the elastic sheet 6 is inserted into the inlet port 10 when the valve is operated.
It is not affected by the dynamic pressure of the flowing gas emitted from the. Therefore, peeling and deformation of the elastic sheet 6 are unlikely to occur.

(F) Since the toroidal plate-shaped elastic sheet 6 is made of hydrogenated nitrile butadiene, the swelling deterioration due to the refrigerant is small and the durability of the elastic sheet 6 is good.

Next, a second embodiment of the present invention will be described with reference to FIG. In this second embodiment, FIG.
As shown in FIG. 3, the bottom surface of the valve body 3 is configured to be flat, and on the other hand, a convex portion 7a is formed on the surface portion of the elastic seat 6 on the valve chamber side, that is, the periphery of the communication port 8 of the valve seat 7. The top of 7a is a joint with the valve body 3.

According to the second embodiment constructed as described above, the convex portion 7a, which is important for the valve sealing mechanism, can be integrally formed when the elastic sheet 6 made of rubber or the like is formed, and the workability is remarkably improved. To do.

The present invention can be embodied with the following modifications. (1) Embodying the present invention in a relief valve for applications other than a vehicle compressor. (2) Embodying the present invention as a valve other than a relief valve, for example, a closing valve or a check valve. (3) Although the present invention has been described as a screw-in fixed type valve, it should be embodied as a type in which piping is connected to the inflow port. (4) Change the elastic sheet to another sealing material.

[0030]

Since the present invention is constructed as described above, it has the following effects. According to the invention described in claim 1, precision machining in the valve chamber is not required, workability is improved, and miniaturization of the valve is easily supported.

According to the second aspect of the invention, the convex portion of the valve sealing mechanism that requires precision finishing is provided on the bottom surface side of the valve body, so that it is easy to secure the processing accuracy.

According to the third aspect of the present invention, since the convex portion important for the valve sealing mechanism is provided on the elastic sheet, it is possible to integrally form the elastic sheet at the time of forming the elastic sheet, and the working operation can be simplified.

According to the fourth aspect of the invention, since the elastic sheet is not affected by the dynamic pressure of the fluid when the high pressure gas is released, the elastic sheet is not adversely affected by peeling or deformation.

[Brief description of drawings]

FIG. 1 is a sectional view showing a valve of a first embodiment.

FIG. 2 is a partial cross-sectional view showing a valve of the second embodiment.

FIG. 3 is a sectional view showing a conventional valve.

[Explanation of symbols]

1 ... Valve body, 2 ... Valve chamber, 3 ... Valve body, 3a ... Convex portion, 4 ...
Disc, 5 ... Spring, 6 ... Elastic seat, 7 ... Valve seat, 7a
... Convex portion, 8 ... Communication port, 9 ... Escape hole, 10 ... Inflow port,
11 ... Compressor housing, 12 ... High pressure chamber, 13 ...
gasket.

Front page continued (72) Inventor Yuka Hirano 2-chome Toyota-cho, Kariya city, Aichi Prefecture Toyota Industries Corporation

Claims (4)

[Claims] 1. A valve chamber is formed inside a valve body, a fluid inlet is provided in a bottom wall of the valve chamber, and the inlet and the valve chamber are communicated with a bottom face of the valve chamber around the inlet. A donut plate-shaped elastic sheet having a communication port for mounting is fixedly mounted, and the valve seat side surface portion of the elastic seat is used as a valve seat, and the valve body can be moved up and down in the valve chamber, and the valve seat. A valve which is pressed against the valve seat side by spring pressure or the like so as to form a valve sealing mechanism between the valve and the valve, and is housed. 2. An annular convex portion is formed on the bottom surface of the valve body,
The valve according to claim 1, wherein the convex portion is a joint portion with the valve seat. 3. The valve according to claim 1, wherein an annular convex portion is formed on the valve seat, and the convex portion is a joint portion with the valve body. 4. The valve according to claim 1, wherein a communication port of the elastic sheet is made larger than the inflow port so that the elastic sheet does not protrude into the communication port.