JP2002054757A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase close adhesion property of a valve by plastically deforming a valve seat by pressing in a valve service consisting of the valve opening and closing a flow of fluid and the valve seat. SOLUTION: In the valve device consisting of the valve seat and the valve opening and closing a flow of fluid flowing through the valve seat, a valve seat part 24a in which either of a valve receive face of the valve seat 24 and a pressing face of the valve 22 adheres closely to an outer shape of the valve is provided on the valve receive face by pressing a pressing face 22a of a corresponding valve or a valve receive face of a corresponding valve seat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device for preventing leakage of a valve by increasing the tightness of a control valve or other valves used for controlling a discharge amount of a variable displacement compressor, for example.

[0002]

2. Description of the Related Art For example, in an air conditioner for an automobile, a compressor (compressor) constituting the refrigeration cycle is driven by being directly connected to an engine of the automobile by a belt or the like. The capacity cannot be adjusted by controlling the rotation speed of the compressor. Therefore, in this type of refrigeration cycle, a variable displacement compressor that can adjust the cooling capacity by changing the discharge amount of the refrigerant without being limited by the number of revolutions of the engine or the like is used.

In the variable displacement compressor 3, for example, a tilting plate 5 having a variable tilt angle is rotated about a rotary shaft 6 in a hermetically formed crank chamber 4 to perform tilting motion. The refrigerant in the suction chamber 8 is sucked into the cylinder 7 a and compressed by the piston 7 that reciprocates in conjunction with the movement, and then discharged to the discharge chamber 9. The discharge amount of the refrigerant discharged from the discharge chamber 9 is changed by changing the inclination angle of the tilting plate 5 according to the difference between the pressure in the crank chamber 4 and the pressure in the suction chamber 8.

In this type of variable displacement compressor, a control valve is generally used to change the inclination angle of the tilting plate 5 according to the pressure difference as described above to change the discharge amount. . As this type of control valve, for example, Japanese Patent Application Laid-Open
There is one described in Japanese Patent No. 166086. That is, the control valve controls a valve unit that opens and closes communication between the discharge chamber 9 and the crank chamber 4.

[0005] The valve section on the high pressure side is normally opened and closed by a valve drive section. In addition, as the valve drive unit, for example, there is a valve drive unit that uses a solenoid that is energized by an external signal or the like. In this case, the opening and closing control is performed by energizing a coil.

[0006]

The conventional control valve described above has the following disadvantages. For example, when a ball valve is used as a valve, even if at least one of the valve and the valve seat is inclined, the seating portion of the ball valve is always circular, so that the adhesion is high. However, when a taper valve is used as a valve, if at least one of the valve and the valve seat is inclined, the seating portion of the taper valve does not become a circle, so that the adhesion becomes low, and the efficiency of the compressor due to valve leakage and valve leakage is reduced. However, there were drawbacks such as a decrease in

Therefore, the present invention is not limited to a control valve, and is an expansion valve or other valve, which is a valve device comprising a valve for opening and closing a fluid flow and a valve seat, wherein the valve seat is plastically deformed by pressing. Accordingly, it is an object to provide a valve seat portion having improved adhesion to a valve.

[0008]

According to the present invention, there is provided a valve device comprising a valve seat and a valve for opening and closing a fluid flowing through the valve seat. One of the pressing surfaces of the valve presses the corresponding valve pressing surface or the corresponding valve seat valve receiving surface to provide a valve seat portion in close contact with the outer shape of the valve on the valve receiving surface. Features.

Here, in the above-mentioned pressing, one of the valve and the valve seat is pressed, for example, against the valve seat of a body made of a metal material to form a valve seat by plastically deforming the valve. A valve is pressed against a valve seat of a body made of a synthetic resin and plastically deformed to form a valve seat. Further, as described above, one of the valve receiving surface of the valve seat and the valve seat pressing surface of the valve is pressed against the valve seat pressing surface of the corresponding valve or the valve receiving surface of the corresponding valve seat, so that the valve seat pressing is performed. The adhesion between the surface and the valve receiving surface can be remarkably increased. As a result, it is possible to reliably prevent the leakage of the refrigerant in the valve closed state in the valve section on the high pressure side where the pressure of the refrigerant is large. The valve here is a concept including a jig for forming a valve seat.

In the case where the synthetic resin forming the valve or the valve seat is pressed to be plastically deformed into a predetermined shape, the plastic may be softened if necessary. In this case, softening is performed by, for example, ultrasonic vibration, high-frequency heating, or heating by ordinary heat conduction, heat transfer, or the like. Furthermore, when the valve is a metal ball valve, it can be plastically deformed by pressing to further improve the adhesion to the valve seat.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a control valve for a variable displacement compressor according to the present invention will be described below with reference to FIGS.
Is constituted by combining the valve-side member 1 and the valve-drive-side member 40.

The valve side member 1 includes a body 11 made of metal or synthetic resin, a filter 12 for removing foreign matter such as metal powder, a shaft 13, a disk 14,
It comprises a spring support 15 and a spring 16.

In FIG. 1, at the upper end of the body 11,
First communication path 17 communicating with discharge chamber 9 in use state
And a second communication passage 1 also communicating with the crank chamber 4.
8 is provided at an intermediate portion of the body 11, and further, a third communication passage 19 communicating with the suction chamber 8 is formed. A fourth communication passage 20 communicating with the first communication passage 17, the second passage 18 and the third passage 19 is formed in the center of the body 11 in the axial direction. , A ball valve or the like.

In a combined state as shown in FIGS. 1 and 2, a diaphragm 59 as a pressure-sensitive member is sandwiched between the valve-side member 1 and the valve-driving-side member 40, and the airtightness is further improved. Therefore, a seal 33 is attached.

In FIG. 1, a valve 22 such as a ball valve is accommodated in a valve seat 24 provided at an upper portion of the body 11 and at an upper end of a fourth communication passage 20, and the valve seat 24 is further pressed. By performing (coining) processing, the valve 22 is plastically deformed into a shape that exactly matches the outer shape of the valve 22. An example of the pressing process will be described below with reference to FIGS.

FIG. 3 shows a front end portion of the body 11 forming the valve side member 1 before pressing. From this state, as shown in FIG. 4, the pressing surface 22a, which is the outer surface of the valve 22 such as a ball valve, is brought into contact with the valve receiving surface (contact surface with the valve) of the valve seat 24, and the pressing surface of the valve is 22a is pressed so as to be in close contact with the valve seat portion 24a having a more precise shape.
Is formed on the valve receiving surface.

In this embodiment, the valve seat 24 and the valve 22 are each made of metal. In the case of the body 11 made of a synthetic resin, the material of the body 11 forming the valve seat 24 is heated and softened and pressed by high-frequency heating, heating by general heat conduction and heat transfer, or ultrasonic vibration. May go. In this case, it is of course possible to perform the pressing without softening.

By the above-described pressing, the valve seat 2 formed temporarily on the body 11 made of, for example, a synthetic resin or metal.
By pressing the valve 22 with the pressing surface 22a of the valve 22, the plastic deformation is performed so that the valve 22 comes into close contact with the pressing surface 22a, and as shown in FIG. A more accurate valve seat 24a can be formed.

When the valve 22 is seated on the valve seat portion 24a, the contact area between the valve 22 and the valve seat portion 24a increases when the valve is closed, and the tightness between them is further improved to enhance the sealing performance. This can prevent valve leakage.

A valve 22 such as a ball valve and a valve seat 24 functioning as a high-pressure side valve portion function to open and close the communication between the discharge chamber 9 and the crank chamber 4. That is, the first communication passage 17 communicating with the discharge chamber 9 and the second communication passage 17 communicating with the crank chamber 4.
The communication with the communication path 18 via the fourth communication path 20 is opened and closed. Further, the communication through the fourth communication path 20 between the second communication path 18 and the third communication path 19 communicating with the suction chamber 8 is opened and closed.

In the compressor of the embodiment having the above-described configuration, the tilt angle of the tilting plate 5 is large, and when the discharge amount of the compressor is large, the valve 22 is closed and the pressure in the compressor is reduced by the suction chamber 8.
It is almost equal to the internal pressure.

In the control valve of this embodiment, as described above, the close contact between the valve 22 and the valve seat 24a is further enhanced by pressing, so that leakage of the refrigerant can be reliably prevented.

With respect to another example of the pressing (coining) processing shown in FIGS. 6 to 8, a valve device including a valve or valve seat forming jig having a tapered portion and a valve seat will be described.
In this example, ultrasonic vibration or high-frequency heating is used together during the pressing.

As shown in FIG. 6, a metal cone-shaped valve or a metal valve as shown in FIG. 7 is attached to a valve seat 61 provided on a body 60a of a valve member 60 made of synthetic resin from a state before pressing. By pressing the jig 65 for forming the valve seat, the valve seat 61 is pressed.
a is formed.

When heating by vibrating using ultrasonic waves, horns 71a and 65 of the valve seat forming jig become horns. In the case of heating using high frequency, 65 is a heating section.

The valve seat 61 provided on the body 60a to which the cone-shaped valve or valve seat forming jig 65 is in close contact is softened by ultrasonic vibration or high-frequency heating, and the valve or valve seat forming jig 65 is moved to the valve seat. When pressed in the direction, the pressing surface 65a of the valve presses the valve receiving surface (contact surface with the valve) of the valve seat 61, and the valve seat 61 is plastically deformed in accordance with the shape of the valve 65, and the degree of adhesion is increased. Valve seat 6 with raised and more accurate shape
1a is formed by a pressing surface 65a which is the outer surface of the valve. Thereby, the adhesion between the valve or the jig 65 and the valve seat 61a is further enhanced, and valve leakage can be prevented.

In the above, an example has been described in which the valve seat of the body constituting the valve side member of the high pressure side valve portion is subjected to press working. Needless to say, both the valve portions on the side may be similarly pressed. Further, although the control valve has been described as an embodiment of the present invention, the present invention can be applied to other valves.

[0028]

As described above, according to the present invention, the valve seat is pressed against the pressure receiving surface of the valve seat and is plastically deformed. Since the valve is provided on the receiving surface, the adhesion of the valve can be remarkably enhanced, the leakage of refrigerant from between the valve and the valve seat portion is eliminated, and various valves such as a control valve for a variable displacement compressor are efficiently used. There is an advantage that can be driven.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a non-energized state of a control valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an energized state of the control valve for a variable displacement compressor shown in FIG.

FIG. 3 is an explanatory diagram showing an example of a pressing process in a high-pressure side valve portion of the control valve in FIG. 1 and showing an unprocessed state in which a part is omitted.

FIG. 4 is an explanatory view showing an example of a pressing process in the valve portion and showing a processing state of a valve seat by the pressing process, which is partially omitted.

FIG. 5 is an explanatory view showing an example of the pressing process in the valve portion and showing a state after the end of the process in which a valve or a valve seat forming jig to be pressed by the partially omitted pressing process is removed.

FIG. 6 is a cross-sectional view showing another example of the pressing process and showing an unprocessed state.

FIG. 7 is a cross-sectional view showing another example of the pressing process and showing a processing state of the valve seat by the pressing process.

FIG. 8 is a cross-sectional view showing another example of the pressing process, showing a state after the valve seat has been processed by the pressing process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve side member 11 Body 22 Valve 22a Pressing surface 24 Valve seat 24a Valve seat portion 60 Valve side member 60a Body 61 Valve seat 61a Valve seat portion 65 Valve or valve seat forming jig 65a Pressing surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Iku Kobayashi 1211-4 Nukudacho, Hachioji-shi, Tokyo F-term in KG Inc. (reference) 3H052 AA01 BA02 CA17 CA19 CB18 EA11 3H058 AA04 BB03 CA20 CA22 CB18 EE17 EE18 3H071 AA06 BB01 CC28 CC31 DD11 EE07 3H106 DA05 DA13 DA23 DB02 DB12 DB23 DB32 DC04 EE39 GB11 GB18 JJ03 JJ05 KK17 KK23

Claims (5)

[Claims] 1. A valve device comprising a valve seat and a valve for opening and closing a fluid flowing through the valve seat, wherein one of a valve receiving surface of the valve seat or a pressing surface of the valve is a pressing surface of a corresponding valve or a corresponding pressing surface of the valve. A valve device, wherein a valve seat portion that is in close contact with the outer shape of the valve is provided on the valve receiving surface by pressing the valve receiving surface of the valve seat to be pressed. 2. At least one of said valve or valve seat is
2. The valve device according to claim 1, wherein the valve device is formed of a synthetic resin. 3. The valve or valve seat heats and softens and presses the material constituting the valve or valve seat,
3. The valve device according to claim 1, wherein a valve seat portion having improved adhesion to a valve is provided on a pressure receiving surface of the valve seat. 4. The valve device according to claim 1, wherein the valve is a metal ball valve. 5. The valve device according to claim 1, wherein the valve is a jig for forming a valve seat.