RU2384875C1 - Pressure controller - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention refers to control accessories, particularly to automatic pressure controllers. The pressure controller consists of a case, of inlet and outlet branches, of a filter, of output and input cavities, of a membrane interacting with a spring-loaded rod and sealing the rod relative to environment on the side of the output cavity, of a gate, and of a seat set with a gap relative to the gate and dividing the internal cavity of the case to input and output cavities. The second membrane pressure tight attached to the case and rod is additionally inserted into the pressure controller. Effective area of the membrane is equal to area of flow section of the seat. A plastic bushing is installed between the gate and the second membrane; the bushing travels relative to the case and is equipped with fluoroplastic insertions with lengthwise channels arranged along generatrix and operating as guides; the channels communicate the input cavity with the cavity under the second membrane. Also the fluoroplastic insertions are spring loaded with a rubber ring installed inside the bushing.

EFFECT: increased reliability and service life of controller, ensuring stability of damping by means of controller at input pressure pulsations and at rapid changes of fluid consumption.

2 dwg

Description

The invention relates to control valves, in particular to automatic pressure regulators.

Known pressure regulators according to patents of the Russian Federation No. 2206116, 2168754, 2117980, 2141128, US patents No. 3960358, 4264961, German patents No. 3432494, 4030104, etc.

Known pressure regulators, for example, according to the certificate for utility model RU 11353, operating according to a circuit not unloaded from inlet pressure fluctuations ("unloaded circuit"). The disadvantage of this kind of devices is a large regulatory error.

Known pressure regulator according to the application No. 2005112244, where the regulator is made according to the "unloaded scheme". This technical solution is taken as a prototype.

The device comprises a housing, inlet and outlet nozzles, a saddle, a filter, a seal, a shutter, a spring-loaded membrane, a collector, a nozzle for flushing the device.

The disadvantage of the prototype is the presence of a sealing rod seal, subject to wear due to friction during movement of the rod, and, as a result, a change in the damping force during rod oscillations until the seal leaks.

The objective of the invention is to increase reliability and increase the resource of the regulator, ensuring the stability of damping with pulsations of the inlet pressure and with sharp changes in fluid flow through the regulator.

The problem is solved in that in a pressure regulator comprising a housing, inlet and outlet nozzles, a filter, inlet and outlet cavities, a first membrane that interacts with a spring-loaded stem, and which seals the stem with respect to the environment from the outlet cavity side and is a sensitive element of the regulator, a shutter, a saddle located with a gap with respect to the shutter and dividing the internal cavity of the housing into the inlet and outlet cavities, a second membrane is introduced, which is sealed to the housing and the stem, providing tightness of the stem with respect to the environment from the side of the inlet cavity, and its effective area is equal to the area of the saddle passage area, which makes the controller circuit “unloaded”, i.e. independent of inlet pressure.

In addition, a plastic sleeve is installed between the shutter and the second membrane with fluoroplastic inserts inserted along the generatrix, having longitudinal channels for communicating the inlet cavity with a cavity under the second membrane. The liners are spring-loaded with a rubber ring mounted inside the sleeve. The liners act as a damping element for damping the oscillations of the shutter during regulation.

Figure 1 shows the proposed flow controller, figure 2 is a section along aa of the sleeve 14, the rubber ring 18, the insert 16 (rotated), where:

1 - housing;

2 - inlet pipe;

3 - outlet pipe;

4 - filter;

5 - a glass;

6 - a saddle;

7 - input cavity;

8 - output cavity;

9 - spring;

10 - stock;

11 - shutter;

12 - the first membrane;

13 - the second membrane;

14 - sleeve;

15 - grooves;

16 - insert;

17 - a submembrane cavity of the second membrane;

18 - a rubber ring.

The pressure regulator includes a housing 1, input 2 and output 3 nozzles, filter 4, input 7 and output 8 of the cavity, the first membrane 12, interacting with the spring rod 10 and the sealing rod 10 with respect to the environment from the side of the outlet cavity 8, the shutter 11, a saddle 6 located with a gap with respect to the shutter 11 and dividing the internal cavity of the housing into the input 7 and output 8 of the cavity, the second membrane 13, which is sealed to the housing 1 and the stem 10, ensuring the tightness of the stem 10 with respect to the environment from the side the passage cavity 7, and its effective area is equal to the passage area of the seat 6. Furthermore, between the shutter 11 and the second membrane 13, a plastic sleeve 14 is installed, having fluoroplastic liners 16 with longitudinal channels 17 for communicating the inlet cavity 7 with a cavity under the second membrane 13. The liners 16 are spring-loaded with a rubber ring mounted inside the sleeve 14.

The proposed regulator works as follows.

The liquid through the inlet pipe 2 of the housing 1 and the filter 4 enters the inlet cavity 7 of the pressure regulator and through the gap between the valve 11 and the seat 6 into the outlet cavity 8 and then into the outlet pipe 3.

With increasing fluid pressure in the outlet cavity 8, the force arising on the first membrane 12 increases and through the rod 10, overcoming the friction force of the liners 16 on the cup 5, is transmitted to the spring 9, compressing it. The gap between the valve 11 and the seat 6 decreases, increasing the resistance to fluid flow, thereby reducing the pressure in the outlet cavity 8.

With a decrease in pressure in the outlet cavity 8, the spring 9 brings the rod 10, the valve 11 and both membranes 12 and 13 to their original position.

When moving the sleeve 5 fixed on the rod 10 of the sleeve 14 relative to the glass 5 fixed in the housing 1, the liquid enters the submembrane cavity 17 of the second membrane 13 through the grooves of the sleeve 15, which ensures damping of the “shutter 11 - rod 10 - spring 9” system relative to the regulator case 1.

Fluoroplastic liners 16, spring-loaded with a rubber ring 18 and interacting with the cup 5, provide a linear movement of the rod 10, and the friction force arising from this creates an additional damping force.

Thus, the introduction of a second membrane, as well as a plastic sleeve with liners and channels, avoids wear of the movable seals and makes it possible to ensure damping stability with pulsations of the inlet pressure and with sharp changes in the flow rate of the liquid through the regulator and increase the life of the regulator.

All parts of the regulator are manufactured using well-known and industry-proven technologies.

Claims (1)

A pressure regulator comprising a housing, inlet and outlet nozzles, a filter, inlet and outlet cavities, a membrane interacting with a spring-loaded stem and sealing the stem with respect to the environment from the outlet cavity side, a shutter, a seat located with a gap with respect to the shutter and separating the internal cavity of the housing to the input and output cavities, characterized in that a second membrane is inserted into it, sealed tightly to the housing and the stem, ensuring the stem is leakproof with respect to the environment with orons of the entrance cavity, and its effective area is equal to the saddle passage area, and between the shutter and the second membrane there is a plastic sleeve that can be moved relative to the housing, which has fluoroplastic inserts with longitudinal channels forming guides for communicating the entrance cavity with a cavity under the second membrane while fluoroplastic liners are spring-loaded with a rubber ring mounted inside the sleeve.

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