JPH0232506B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in discharge pressure regulating valves.

In the discharge pressure regulating valve, a ball is arranged opposite to the valve seat, and an elastic pressing means is provided to press the ball against the valve seat, and the pressing force is adjusted to adjust the discharge pressure of the passing fluid by the valve. be adjusted. When fluid flows in from the valve seat opposite the ball and flows out toward the valve side, so-called valve noise may occur. It is most noticeable at the neutral point, especially when the valve begins to open.

An object of the present invention is to prevent the above-mentioned valve noise. Valve noise is thought to be caused by the mutual influence of waves generated when fluid passes through the valve, vibration of the valve, and resonance.

Conventionally, in the structure of the above-mentioned discharge pressure regulating valve, when arranging the ball to face the valve seat, efforts have been made to maintain the ball on the center line of the valve seat. For example, in order to vertically displace the ball on the center axis of the valve seat, the ball is spot welded to a guide vane material that is slidably disposed along the cylindrical surface in the axial direction, and the ball and the guide vane material are integrally assembled. It is structured as a valve main body. This configuration was intended to maintain the center and absorb vibrations. The ball exerts a pressing force on the valve seat through a suitable elastic material such as a bellows or a coil spring.

However, in reality, with the above-mentioned valve body configuration, it has been experienced that the above-mentioned center maintenance, complete valve occlusion, and prevention of valve noise by vibration prevention are extremely difficult to achieve, and are problematic in themselves.

The present invention was derived from attempts at various solutions to the above problem. The object of the present invention is to provide a discharge pressure regulating valve which is based on the conventional structure and improved upon, eliminates valve noise, and completely closes the valve.

In the present invention, the ball, which is the main body of the valve, is rotatably attached to the concave hole from the spherical surface of the guide vane material, thereby improving the accuracy of closing the valve seat. By abutting the rectifying element, it helps maintain the center position of the ball, prevents vibration, and suppresses resonance, and the annular flow path formed between the valve seat and the cylindrical element improves fluid flow. A valve that performs a rectifying action and an equalizing action on the flow on the ball surface, and can effectively prevent valve noise while completely closing the valve through the joint action of the rectifying element and the guide vane material opposed to and in contact with the ball. Provides a ringing prevention device.

Next, the present invention will be explained with reference to embodiments shown in the drawings.
The illustrated discharge pressure regulating valve is a pressure regulating valve for pressurized refrigerant used in room coolers, refrigerators, and the like.

A valve is shown in which an inflow pipe 2 is connected to the lower part of the main body 1, an outflow pipe 3 is connected to the side thereof, and a ball 4 is used as a valve body in a passage communicating therebetween.

The ball 4 is placed opposite the valve seat 21.
The ball comes into contact with a guide vane member 5, which is arranged so as to be able to slide up and down with its outer edge in contact with the cylindrical inner surface extending upwardly of the valve chamber 20, and presses the ball downward toward the valve seat using a pressing means to be described later. It is provided.

The central portion of the guide vane material 5 is provided to hold the ball 4 in a concave cavity 5a made of a spherical surface that is in contact with the ball 4, and the ball 4 can freely rotate therebetween without any play.

In the conventional structure of the above-mentioned ball valve, a ball is placed in the center of a guide vane material similar to the above, and this is spot-welded to form a valve main body that can freely slide vertically by integrating the guide vane material and the ball. It was something that had been done.

Next, a bellows 6 is disposed between the guide vane material 5 and the guide 9, and the guide 9 is placed between the bellows receiver 7 and the spring receiver 12 that support the bellows 6.
A rod 8 is provided passing through it. The guide 9 is fixed to the main body 1 and guides the rod 8 slidably in the direction of the center line.

The lower end surfaces of the bellows 6 and the bellows receiver 7 are
A spherical concave cavity 6a matching the concave cavity 5a of the guide vane material 5 is provided in the bellows 6, and a concave cavity 7a is provided in the bellows receiver 7, respectively, to maintain the position of the ball 4 in the center line direction.

The spring box 10 extends above the main body 1, and along its inner surface, a guide vane material 13 that helps the spring receiver 12 slide in the center line direction is in contact with the spring box 10 at its peripheral edge, and the above-mentioned A coil spring 11 is provided to hold a spring receiver 12, and a coil spring 11 is provided between the spring receiver 12 and the adjustment screw 14. The pressure of the spring 11 is arbitrarily adjusted by the adjusting screw 14, and the pressing force is applied to the spring 4.

Therefore, in the illustrated example, the pressing force of the ball 4 is applied by a forward pressing means consisting of the bellows 6 and the spring 11. However, the above-mentioned pressing means may be freely replaced with appropriate means according to the purpose.

A rectifying element that comes into contact with the ball 4 is provided within the hole diameter of the valve seat 21 . The rectifying element is the inflow pipe 2
A cylindrical element 22 that presses against the ball 4 and an elastic means that applies the above-mentioned pressure to the cylindrical element 22 are provided in the fluid inflow direction. That is, the coil spring 23
is inserted between the cylindrical element 22 and a spring receiver 24 fixed to the inflow pipe 2.

The cylindrical element 22 is made of a cylindrical body having an outer diameter less than the hole diameter of the valve seat 21, and its upper edge abuts against the ball 4 in an annular manner. The upper edge is basically on a plane perpendicular to the center line of the cylindrical member 22, and maintains the cylindrical member 22 on the center line of the ball 4 and, in turn, on the center line of the valve seat 21. As shown in the illustrated example, the contact edge with the ball 4 is chamfered at an appropriate angle on the inner surface of the cylindrical element 22, so that the contact of the ball 4 can be stabilized.

The spring receiver 24 is an annular member that maintains the spring 23 on the center line and does not obstruct the inflow of fluid.

Thus, the cylindrical element 22 interacts with the ball 4 to maintain its position on the center line, and forms an annular flow path 25 with an appropriate clearance between the cylindrical element 22 and the valve seat 21. Further, the auxiliary spring 23 acts in the opposite direction on the positive pressing means consisting of the bellows 6 and the spring 11, and the spring strength is such that the cylindrical element 22 is always pressed against the ball 4 in accordance with the displacement of the ball 4. This is sufficient to bring it into contact with the For example, when the positive pressing force is 7 kg, the pressing force of the auxiliary spring is 0.5 kg.

Therefore, the setting of the discharge pressure is performed exclusively by adjusting the positive pressing pressure using the adjusting screw 14, and when fluid with a pressure exceeding the set pressure flows into the inflow pipe 2, the ball 4 is It opens from the valve seat 21, flows into the valve chamber 20, and is discharged from the outflow valve 3. Through the openings of the valve seat 21 and the ball 4, that is, the openings determined by the balance between the positive pressing force and the fluid pressure, the discharge pressure is reduced and flows out at a constant pressure due to the flow resistance of the fluid.

Although it is not necessary to follow the example of a refrigeration circuit such as a room cooler, the valve part tends to vibrate when fluid flows in. It is known that valve noise is most likely to occur especially at the neutral point when the valve begins to open.
Furthermore, when the fluid is gas, it is likely to cause friction noise at the valve part, and when the fluid is a gas-liquid mixture, it is unstable and tends to generate vibrations.
All of these issues require countermeasures.

Since the present invention is constructed as described above,
The ball, which is the main body of the valve, is rotatably attached to a concave spherical surface of the guide vane material, improving the accuracy of closing the valve seat.On the opposite side of the ball is a rectifying element made of a cylindrical element. The annular flow path formed between the valve seat and the cylindrical element helps to maintain the center position of the ball, prevents vibration, and suppresses resonance. It has the feature of equalizing the flow on the surface and effectively preventing valve noise while completely closing the valve due to the joint action of the guide vane material and the rectifying element which are opposed to and abutted against the ball.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a discharge pressure regulating valve according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main body of the valve. 2...Inflow pipe, 3...Outflow pipe, 4...Ball,
5... Guide vane material, 5a... Concave hole of guide vane material,
6...Bellows, 11...Spring, 21...
Valve seat, 22... cylindrical element, 23... auxiliary spring, 25... annular flow path.

Claims (1)

[Claims] 1. A concave hole made of a spherical surface is formed in the center of a guide vane material whose outer edge is slidably disposed in contact with the inner surface of the valve body, and a ball is rotatably held in the concave hole made of a spherical surface without any play. The ball is pressed against the valve seat by an elastic pressing means, and the ball has an outer diameter less than the valve seat hole diameter and the end edge is formed so as to form an annular flow path within the valve seat hole diameter between the ball and the valve seat. A valve noise prevention device for a discharge pressure regulating valve, characterized in that a rectifying element consisting of a cylindrical element annularly abutting the ball is pressed against the ball by an auxiliary spring opposing the elastic pressing means.