RU2484434C1 - Gas pressure control valve - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: strong spring 7 fitted on spherical bearing 10 transmits its force to membrane 4 via disc 8 located thereon and provided with ledge 9 to rule out membrane skew decreasing cycle life. Prior to tightening spring 7 by screw 11, damper plate 5 is centred at plate spring 6 and contracted by spring force to maintain invariable friction during pressure control valve operation thanks to uniform butt between plate 5 and faces of plate spring 6. Pusher 3 is rigidly arranged inside and at the centre of ledge 9 of disc 8 to transmit force to valve 2 composed of ball to ensure precision of maintained controlled parameters so that valve warp.

EFFECT: higher stability and precision.

1 dwg

Description

The invention relates to automatic devices for regulating gas pressure and can be used in power engineering.

Gas pressure regulators are known which, in order to eliminate fluctuations in the controlled pressure, have a movable barrier (spring ball) in the channel between the outlet cavity and the cavity of the sensing element (see, for example, US Pat. No. 325,376, CL 137-4848) or a valve mounted on a sensitive an element that overlaps the channels located between the output cavity and the cavity of the sensing element. The valve is connected to the regulatory body by a stem (see, for example, USSR copyright certificate No. 890370, G05D 16/06, 1979).

Such valves do not have high reliability and are laborious to work out, because when the inlet pressure or gas flow changes, the regulator opens or closes, which leads to a change in the stroke of the valve mounted on the sensing element (see, for example, copyright certificate No. 890370), and therefore the damping efficiency is impaired. In addition, there is unstable friction between the stem and the body during operation, which impairs the accuracy of maintaining the outlet pressure, and the gap serves as a source of contamination during gas flow and failure to operate.

A gas pressure reducer is also known, including a valve located in the housing, a control membrane and an adjustment spring, characterized in that in order to stabilize the operation, it is equipped with a damper made in the form of an elastic plate polyhedron forming a friction pair with a plate rigidly connected to the shutter (see , for example, USSR copyright certificate No. 219970 dated 05/07/1966 - prototype of the invention).

The disadvantage of a gas pressure reducer according to copyright certificate No. 219970 is due to the fact that the same plate part serves both for alignment with respect to the membrane and for alignment with respect to the leaf spring, which is impossible. As a result, the centering of the spring force acting on the sensing element is not ensured, therefore, the membrane and pusher can be deformed, which during operation will lead to a deterioration in the accuracy of maintaining the controlled pressure, destruction of the membrane and failure of the gearbox. In addition, the power spring, which has permissible distortions of the ends during manufacture, acting directly on the plate, will not allow the plate to concentrate on the leaf spring, therefore, the force acting on the face will be uneven, which will lead to wear of individual faces and failure of the damper. The poppet valve according to copyright certificate No. 219970 when the pusher is skewed, creates increased leakage and violates the accuracy of maintaining the adjustable pressure.

The invention is aimed at improving the stability, stability and accuracy of the gearbox.

For this, the known gearbox, unlike the prototype, is equipped with a disk with a protrusion centered on the membrane and tightly connected with it, a damper plate centered by a leaf spring is mounted on the protrusion of the disk with a gap and pressed by a power spring to the disk through a spherical bearing, inside and in the center of the protrusion the spring-loaded valve pusher is rigidly mounted, and the valve is made in the form of a ball. The essence of the invention lies in the fact that a power spring mounted on a spherical bearing transfers its force to the membrane through a disk centered on the membrane with a protrusion, and thereby eliminates the bias of the membrane, which reduces cyclopress. The damper plate, until the spring is tightened with a screw, is centered on the leaf spring, then it is pressed by the spring force and stable friction is maintained throughout the entire gear operation, due to the same adherence of the plate to the leaf spring faces, which ensures dynamic stability and a long gear life.

A pusher is rigidly installed inside and in the center of the protrusion, which transfers the force to the valve in the form of a ball, which ensures the accuracy of maintaining the adjustable parameter, since the valve is skewed.

With this design of the gearbox, the centering of the plate at the same time on two surfaces is eliminated, as a result of which this design has a stable value of the damper force, and the use of a valve in the form of a ball provides high tightness and accuracy of maintaining the adjustable pressure. The gearbox also has a long runtime without breaking the membrane.

The invention is illustrated in the drawing, which shows a gas pressure reducer, General view.

The gearbox contains the following basic elements:

- housing 1 with tips A and B for the supply and removal of gas;

- an actuating element of a spring-loaded valve 2, seat B and pusher 3;

- the sensitive element is the membrane 4;

- a mechanical damper in the form of a friction pair: plate 5 - leaf spring 6; provides dynamic stability of the mobile system during operation;

- pressure adjuster in the form of a power spring 7;

- a disk 8 with a protrusion 9, on which a damper plate 5 is mounted with a gap E, centered by a leaf spring 6. Inside and in the center of the protrusion, the pusher 3 of the valve 2 is made, which is made in the form of a ball;

- spherical bearing 10, through which the plate 5 of the damper is pressed by a spring 7 to the disk 8;

- adjusting screw 11.

When the gearbox is operating, the high-pressure gas enters the gearbox tip A, passes into the cavity G, from where it passes through the throttle gap formed between the edge of the seat B and the spherical surface of the valve 2 into the cavity D, where it acts on the sensitive element - the membrane 4, and is discharged to to the consumer through the tip B.

The pressure in the cavity D is a controlled pressure and is automatically maintained equal to the setting pressure, which is determined by the tightening force of the master spring 7, using the screw 11.

When the adjustable pressure does not match the pressure of the gear setting on the membrane 4, forces arise that move it and valve 2 in contact with it through the needle 3, changing the area of the throttle slit of the gear. In this case, the adjustable pressure also changes in the direction of decreasing the mismatch with the setting pressure. The plate 5 is centered only by the leaf spring 6, which does not affect the alignment of the efforts of the master spring 7. This provides increased stability, stability and accuracy of the gearbox.

Claims (1)

A gas pressure reducer, comprising an actuator made of a spring-loaded valve, seat and pusher, a sensing element in the form of a metal membrane, a damping element made of a plate and a leaf spring, a pressure adjuster in the form of a power spring, characterized in that it is equipped with a disk with a protrusion centered on the membrane and hermetically connected with it, a damper plate centered by a leaf spring is mounted on the ledge of the disk with a gap, the plate is pressed by a power spring to the disk through a spherical bearing, inside and in the center of the protrusion a spring-loaded valve pusher is rigidly mounted, and the valve is made in the form of a ball.