CN111350871A

CN111350871A - Valve shaft sealing device

Info

Publication number: CN111350871A
Application number: CN201811569161.7A
Authority: CN
Inventors: 章文忠
Original assignee: Hubei Taihe Petrochemical Equipment Co ltd
Current assignee: Hubei Taihe Petrochemical Equipment Co ltd
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2020-06-30

Abstract

A valve shaft sealing device comprises a valve body, a valve shaft and a gland, wherein an annular groove is formed in the valve body around the valve shaft, the gland blocks an opening at the upper end of the groove, two groups of expansion assemblies are arranged in the groove, the two groups of expansion assemblies push the two groups of expansion assemblies to abut against the gland and the bottom surface of the groove respectively through a plurality of springs, and the groove is communicated with the input end of the valve body through a liquid inlet pipe; the expansion assembly comprises two rubber rings, and the end faces of the two rubber rings, which are in mutual contact, are inclined planes. The invention is used for solving the problems that the pressure of the pipeline is increased and the pipeline circulating medium leaks from the valve shaft.

Description

Valve shaft sealing device

Technical Field

The invention relates to a valve shaft sealing device.

Background

At present, a valve shaft of a valve is generally sealed by packing, such as oil-immersed packing, graphite and rubber combined sealing packing, but in practical application, when a packing gland is adjusted, a general pipeline is in a normal pressure state, and a worker loads the sealing packing through the gland until a pipeline circulating medium cannot leak from the valve shaft, and then stops loading the gland; the gland can not be pressed and held too tightly, and the friction force applied to the gland by the sealing filler is too large due to the fact that the gland is pressed and held too tightly, so that the valve shaft is difficult to axially rotate or axially move, the valve opening torsion is increased, and the labor intensity of workers is improved; however, when the medium is conveyed in the pipeline, the pressure of the pipeline is instantaneously increased due to the temperature change of the circulating medium, the vibration of the plunger, the sudden start and stop of a front-stage valve and a rear-stage valve or a pump, and the flowing medium of the pipeline often breaks through the sealing of the sealing filler and leaks from the valve shaft.

Disclosure of Invention

The invention aims to provide a valve shaft sealing device, which is used for solving the problems that the pressure of a pipeline is increased and a pipeline circulating medium leaks from a valve shaft.

In order to solve the above problems, the technical solution to be solved by the present invention is:

a valve shaft sealing device comprises a valve body, a valve shaft and a gland, wherein an annular groove is formed in the valve body around the valve shaft, the gland blocks an opening at the upper end of the groove, two groups of expansion assemblies are arranged in the groove, the two groups of expansion assemblies push the two groups of expansion assemblies to abut against the gland and the bottom surface of the groove respectively through a plurality of springs, and the groove is communicated with the input end of the valve body through a liquid inlet pipe; the expansion assembly comprises two rubber rings, and the end faces of the two rubber rings, which are in mutual contact, are inclined planes.

And a circle of steel gasket is arranged on the inclined plane where the two rubber rings contact in the expansion assembly, and the two steel gaskets are attached together.

Install manometer, booster and check valve on the feed liquor pipe, the booster includes the cylinder body, is equipped with the piston in the cylinder body, is connected with the screw rod in cylinder body one end, and the piston terminal surface is connected with screw rod one end through universal bulb, and the screw rod other end and handle fixed connection, feed liquor pipe and cylinder body intercommunication pass through the pressure release pipe at the feed liquor pipe and communicate the valve body output, install the stop valve on the pressure release pipe.

The invention has the technical effects that: when the pressure of the pipeline rises suddenly, the medium flowing in the pipeline enters the cutting groove, the medium rising suddenly is utilized to push the two rubber rings in the expansion assembly to move radially, so that the cutting groove is fully filled with the two rubber rings, the valve shaft is sealed, and the sealing performance is better when the pressure of the pipeline is higher; on the other hand, two sets of expansion assembly compare current packing seal, and is little with valve shaft area of contact, and frictional force reduces, and the valve moment of opening and close will be little.

Drawings

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic cross-sectional view of the present invention,

FIG. 2 is a schematic cross-sectional view taken along line A-A in FIG. 1,

fig. 3 is a schematic cross-sectional view of a supercharger according to the present invention.

In the figure: the valve comprises a valve body 1, a valve shaft 2, a gland 3, a rubber ring 4, a spring 5, a liquid inlet pipe 6, a supercharger 7, a one-way valve 8, a pressure relief pipe 9, a stop valve 10, a cutting groove 11, a gasket 12, a pressure gauge 13, a cylinder 71, a piston 72, a universal ball 73, a screw 74 and a handle 75.

Detailed Description

As shown in fig. 1 and 2, a valve shaft sealing device comprises a valve body 1, a valve shaft 2 and a gland 3, wherein an annular cutting groove 11 is arranged in the valve body 1 around the valve shaft 2, the gland 3 seals an opening at the upper end of the cutting groove 11, two groups of expansion assemblies are arranged on the cutting groove 11, the two groups of expansion assemblies pass through a plurality of springs 5, the springs 5 are uniformly distributed around the axis of the valve shaft 2, the springs 5 push the two groups of expansion assemblies to respectively abut against the bottom surfaces of the gland 3 and the cutting groove 11, and the cutting groove 11 is communicated with the input end of the valve body 1; the expansion component comprises two rubber rings 4, and the end faces of the two rubber rings 4, which are in contact with each other, are inclined planes.

The working principle of the invention is as follows: when the pressure of a pipeline for installing the valve is at normal pressure, the medium pressure in the pipeline and the spring 5 jointly push the two rubber rings 4 in the expansion assembly to move radially, so that the two rubber rings 4 fill the cutting groove 11, and the valve shaft 2 is prevented from leaking under normal pressure; when the temperature of a medium in the pipeline rises and the pressure of the pipeline rises suddenly after a front-stage valve or a pump is opened suddenly, the pressure of the medium in the cutting groove 11 also rises suddenly, so that the two rubber rings 4 are forced to move further radially, the pressure applied to the inner wall of the cutting groove 11 and the pressure applied to the outer wall of the valve shaft 2 by the two rubber rings 4 also rise, and the valve shaft 2 is further sealed, namely, the higher the pressure of the pipeline is, the higher the pressure applied to the inner wall of the cutting groove 11 and the pressure applied to the valve shaft 2 by the two rubber rings 4 are, and the better the valve shaft 2 is.

In the expansion assembly, the middle parts of the inclined planes of the two rubber rings 4 which are contacted with each other are provided with a circle of steel gaskets 12, and the two steel gaskets 12 are attached together. The two steel gaskets 12 can reduce the friction force between the two rubber rings 4, so that the two rubber rings 4 can move radially.

Install manometer 13, booster 7 and check valve 8 on feed liquor pipe 6, booster 7 includes cylinder 71, is equipped with piston 72 in the cylinder 71, is connected with screw rod 74 at cylinder 71 one end, and the piston 72 terminal surface is connected with screw rod 74 one end through universal bulb 73, and the screw rod 74 other end and handle 75 fixed connection, feed liquor pipe 6 and cylinder 71 intercommunication, at feed liquor pipe 6 through the pressure release pipe 9 intercommunication valve body 1 output, install stop valve 10 on pressure release pipe 9.

When the pipe is vibrated by plunger, the pressure of the pipe changes at high frequency, for example, 0.7-1 Mpa/s, the two rubber rings 4 are frequently expanded and contracted, a small amount of medium leaks out of the valve shaft 2 under the suction and discharge effects of the rubber rings 4, at this time, the piston 72 can be pushed to move by manually rotating the handle 75, the medium in the cylinder 71 is forcibly pushed into the cutting groove 11, the pressure of the medium in the cutting groove 11 is greater than 1Mpa, the expansion assembly is locked, so that the rubber rings 4 cannot be pushed to move and the one-way valve 8 cannot be conducted even if the highest pressure of the pipe is 1Mpa, and the rubber rings 4 can be kept to stably seal the valve shaft 2, so that the medium is prevented from leaking from gaps of the valve shaft 2; when the valve needs to be opened, the stop valve 10 can be opened to release the medium in the cutting groove 11, so that the friction force applied to the valve shaft 2 by the rubber ring 4 is weakened, and the valve is convenient to open.

Claims

1. The utility model provides a valve shaft sealing device, includes valve body (1), valve shaft (2) and gland (3), encircles and is equipped with annular grooving (11) in valve body (1) around valve shaft (2), and gland (3) are with grooving (11) upper end opening shutoff, its characterized in that: two groups of expansion components are arranged on the cutting groove (11), the two groups of expansion components push the two groups of expansion components to respectively abut against the bottom surfaces of the gland (3) and the cutting groove (11) through a plurality of springs (5), and the cutting groove (11) is communicated with the input end of the valve body (1) through a liquid inlet pipe (6); the expansion assembly comprises two rubber rings (4), and the end faces of the two rubber rings (4) which are in mutual contact are inclined planes.

2. The valve shaft sealing device of claim 1, wherein: a circle of steel gasket (12) is arranged on the inclined plane where the two rubber rings (4) are in contact in the expansion assembly, and the two steel gaskets (12) are attached together.

3. The valve shaft sealing device of claim 1, wherein: install manometer (13), booster (7) and check valve (8) on feed liquor pipe (6), booster (7) include cylinder body (71), are equipped with piston (72) in cylinder body (71), are connected with screw rod (74) at cylinder body (71) one end, and piston (72) terminal surface is connected with screw rod (74) one end through universal bulb (73), and the screw rod (74) other end and handle (75) fixed connection, feed liquor pipe (6) and cylinder body (71) intercommunication, pass through pressure release pipe (9) intercommunication valve body (1) output in feed liquor pipe (6), install stop valve (10) on pressure release pipe (9).