RU2466319C1 - Differential pressure control device - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: differential pressure control device includes housing with detachable bottom, cover plate with holes covered in them, damper with through opening, which is located between housing and cover plate, lever acting on damper through roller, and spacer ring installed between cover plate and detachable bottom of the housing. In seats of housing bottom and cover plate, which seal the connections of damper and cover plate, damper and bottom of housing, sleeve from rigid antifriction material, in the ends of which there made are grooves of labyrinth seal; at that, the above ends form sealing surfaces. Edges of sleeves, which are adjacent to damper, have angle of tapering α≤60°. Sleeves made from rigid antifriction material with labyrinth seals and floating in the corresponding seats of bottom of housing and cover plate are spring-loaded on end faces relative to bottom of seats on the side that is opposite to labyrinth seals with stiff springs and thus pressed with labyrinth sealing surfaces to the damper plane. Sealing rings of round section, which are made from elastomer, are installed on diametrical surfaces of the cover plate and detachable bottom of the housing, which contact the sleeves.

EFFECT: enhanced reliability.

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Description

The invention relates to valves, designed to control the pressure drop of a liquid or gas medium and can be used in the oil and gas industry to control the level of a liquid medium in gas separators, as well as shutoff valves on production lines to shut off the flow or create a given pressure drop.

Known valve with a rotating plate (DE Patent No. 3538404 A1, 04/30/1987, F16K 3/06), comprising a housing with a blocked passage opening, consisting of two parts, between which a valve plate with a passage moves along an sealing surface with antifriction properties along an arc hole.

A disadvantage of the known gate valve is its short service life due to the rapid wear of the sealing surface with antifriction properties and, as a result of this, a partial loss of tightness of the interface between the plate and the sealing surface caused by the abrasive action of solid particles of natural gas or oil pollution on the sealing surfaces. Solid particles are captured by blunting the edges of the plate, mating with the sealing surfaces, when moving relative to the sealing surfaces, are held there and when moving cause deep scratches and grooves on the sealing surfaces.

A device for regulating the differential pressure (RU, patent No. 2191308 C2, 10.20.2002, F16K 3/06), comprising a housing with a blocked opening, a cover, a gate with a passage through the passage of a profiled shape located between the housing and the cover, sealing elements, the lever acting on the gate through the roller.

The disadvantages of the known device are:

- irrational design of the device, expressed in that the accuracy of the gap between the housing and the cover, designed to accommodate the gate between them, is not automatically ensured by the assembly of the mating elements, but requires adjustment;

- not enough technological design of the case for manufacture in small-scale production, the grinding process in the blind hole of the end face of the case mating with the gate is difficult;

- wear of the gate and, as a result, a partial loss of sealing between the gate and the sealing elements, caused by the fact that solid particles of natural gas or oil contaminants are caught by the blunting of the edges of the sealing elements mating with the surface of the gate and are brought under the sealing surface of the sealing element mating with with a gate, they partially penetrate into the body of the sealing element and are held in it, thereby forming, as it were, an abrasive tool that causes deep risk and on the sealing surface of the gate. This is possible due to the introduction of solid particles from the outside due to the significant flexibility of the material of the sealing elements, for example, an elastomer, determined by the functional purpose of the elements.

A device for regulating the differential pressure (RU, patent No. 2330202 C1, 07/27/2008, F16K 3/06), comprising a housing with a removable bottom and a lid with overlapping holes in them, a gate with a through hole, sealing elements, a lever, a roller . A spacer ring is installed between the housing and the cover. The gates of the gate and cover, gate and bottom of the housing are sealed with floating sealing elements. They are made in the form of bushings made of hard antifriction material. The bushings are spring-loaded with O-rings made of elastomer. At the ends of the bushings, grooves of the labyrinth seal are made. The edges of the bushings mating with the gate have a point angle α≤60 °.

A disadvantage of the known device is the loss of reliability, resource, tightness of the device during its operation. The disadvantage is that in the known device, the floating bushings with diametrical and axial clearances relative to the seats of the removable bottom and the cover are spring-loaded relative to the bottom of the seats by O-rings of elastomer, which during operation and contact with contaminants change their rigidity, shape and characteristics during transition the gate position between the Full Pass and Locked device states. This negatively affects the operation of the gate, leads to a change in torque on the lever associated with the gate, loss of reliability, resource and tightness of the known device.

This known device is the closest in technical essence and the achieved results to the claimed invention.

An object of the invention is to increase the reliability, resource and tightness of the device due to the use of mechanical end springs.

The technical task of the device for regulating the differential pressure, comprising a housing with a removable bottom, a cover with holes to be blocked in them, a gate with a through hole located between the housing and the cover, a lever acting on the gate through the roller, a spacer ring installed between the cover and the removable bottom case, and in the slots of the bottom of the case and cover, the sealing mates of the gate and cover, the gate and the bottom of the case, bushings of hard antifriction material, at the ends of which forming evasive surfaces, The grooves of the labyrinth seal and the cover of the bushings mating with the gate have a taper angle α≤60 °, which is solved according to the invention by the fact that the bottom of the housing made of hard antifriction material with labyrinth seals floating on the ends of the housing and the cover of the sleeve are spring-loaded relative to the bottom of the sockets opposite to the labyrinth seals, end hard springs and pressed, thereby, labyrinth sealing surfaces to the plane of the gate, and on the diametrical surfaces of the cover and removable bottom of the housing in contact with the bushings, O-rings of elastomer are installed.

The invention is illustrated by drawings.

Figure 1 - section aa along the axis of the device;

figure 2 - cross section BB along the plane of the gate;

figure 3 - callout With section aa;

figure 4 is a section GG on the bore of the gate.

The device for controlling the differential pressure comprises a housing 1 with a removable bottom 2 with a blocked hole 3, a gate 4 with a through hole 5, a cover 6 with a blocked hole 7. The cover 6 and the removable bottom 2 are mounted in the housing 1 by thrust flat spring rings 8. Between the cover 6 and a removable bottom 2, a distance ring 9 is installed, in the gap between the cover 6 and the removable bottom 2 of the housing 1, determined by the thickness of the distance ring 9, a slide 4 is installed, which is installed with the possibility of transmitting torque through hexagon 10 to the roller 11, at the end which is mounted with the possibility of transmitting torque to a flat lever 12 located in the plane of the slit of the removable bottom 2. The gaps between the housing 1, the cover 6 and the removable bottom 2 are sealed with round rings of elastomer 13, the gap between the roller 11 and the removable bottom 2 is also sealed with a round ring of elastomer 14. Under the ends of the hexagon 10, support washers 10a are made of antifriction material, which absorb the axial load from the roller 11. The set screw 15 and pin 16 are used to fix the relative position relative to each other: body 1, bottom 2, cover 6 and the distance ring 9. In the sockets 17 of the removable bottom 2 and cover 6 are installed with diametrical and axial clearances relative to the sockets 17, providing the possibility of "swimming", the sealing elements 18 in the form of bushings 19 of hard antifriction material, for example antifriction bronze or composites based on fluoropolymers. The bushings 19 are spring-loaded relative to the bottom of the seats 17 with end hard springs 20 and are pressed by the sealing surface 21 to the gate 4. At the end of the sleeve 19, which forms the sealing surface 21, grooves 22 of the labyrinth seal are made. The edges 23 of the bushings 19 have a point angle α≤60 °. On the diametrical surfaces of the cover 6 and the removable bottom 2 of the housing 1 in contact with the bushings 19, O-rings 24 of round cross-section are made of elastomer.

The device operates as follows. The flat lever 12 of the gate 4 is rotated in the gap between the cover 6 and the removable bottom 2. The passage hole 5 of the gate 4 is combined with the overlapped holes 3 and 7 and thereby open the full passage of the working medium through the device. When turning to the other side of the gate 4, the passage hole 5 is first partially aligned with the overlapping holes 3 and 7, thereby adjusting the cross-section of the channel for the passage of the working fluid flow, providing resistance to create the necessary pressure drop of the working fluid flow in the device. With a further rotation of the gate 4, the openings 3, 7 are blocked by the blind portion of the gate 4. The device is locked. The magnitude and accuracy of the gap between the removable bottom 2, the cover 6 and the gate 4 is formed by the difference in thicknesses and thickness tolerances of the distance ring 9 and the gate 4 and is realized when assembling the device. The size of the gap, on the one hand, should provide free movement and coordination of the position of the gate 4 in space, on the other hand, to prevent the penetration of contaminants into the cavity of the device at transitional positions of the gate 4 between the states of the All Wheel Drive and Locked devices. The suction effect of the flow of the working medium through a partially open passage channel also prevents the penetration of contaminants into the cavity of the device. The implementation of the removable bottom 2 of the housing 1 as a separate part facilitates the processing of grinding its surface, mating with the gate 4.

The sleeve 19 of the sealing elements 18 with the sealing surface 21 is pressed against the gate 4 by the differential pressure of the medium on the sleeve 19 and the elastic force of the end hard springs 20.

O-rings 24 of round cross-section made of elastomer, mounted on the diametrical surfaces of the cover 6 and the removable bottom 2 of the housing 1, seal the interface with the bushings 19. The ability of the sleeve 19 to “swim” in the socket 17 provides a force of uniform pressure on the gate 4 of the sleeve 19 and its uniform grinding to the mating surface, which leads to a backlash-free fit, which guarantees reliable sealing of the mating of the gate 4 and the bushings 19. Grooves 22 of the labyrinth seal but increase the reliability of the seal.

The edges 23 of the sleeve 19 are self-sharpening and constantly remain sharp in the future when rubbing the sleeve 19 to the gate 4 due to the fact that the angle of sharpening of the edge 23 is α≤60 °. The acute-angled edge 23 tightly adjoins the surface of the gate 4, cleans all contaminants carried away by the flow of the working medium from the surface of the gate 4, and prevents the penetration of contaminants into the joint between the sleeve 19 and the gate 4.

The use of the invention will improve the reliability, life and tightness of the device for the pressure drop of the working fluid stream, used as shutoff valves on production lines during transportation of natural gas and oil.

The simplicity of the design of the device and the reliability of its operation will ensure widespread use of the invention.

Claims (1)

A device for controlling the differential pressure, comprising a housing with a removable bottom, a cover with holes to be blocked in them, a gate with a through hole located between the housing and the cover, a lever acting on the gate through the roller, a spacer ring installed between the cover and the removable bottom of the housing, and in the nests of the bottom of the housing and the cover, the sealing mates of the gate and the cover, the gate and the bottom of the housing, the bushings of hard antifriction material, in the ends of which forming sealing surfaces grooves are made of the seal and the edges of the bushings, mating with the gate, have a taper angle α≤60 °, characterized in that the floating in the corresponding sockets of the bottom of the housing and the cover of the sleeve of hard antifriction material with labyrinth seals at the ends are spring-loaded relative to the bottom of the nests from the side opposite the labyrinth seals , end hard springs and pressed, thereby, labyrinth sealing surfaces to the plane of the gate, and on the diametrical surfaces of the cover and the removable bottom of the housing in contact with the bushings, tanovleny O-rings made of elastomer.

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