CN114838154A - A kind of hydraulic forced sealing structure and sealing method for valve - Google Patents

Abstract

The invention relates to a hydraulic forced sealing structure and a sealing method for a valve, which comprises a valve body, a valve clack and an end cover, wherein the valve clack is arranged in an inner cavity of the valve body; the valve body is provided with an axial moving sealing sleeve which is controlled by a hydraulic control system to move back and forth, or to press a sealing surface on the valve clack or to leave the sealing surface on the valve clack. The invention can improve the sealing effect of the valve and prolong the service life of the valve.

Description

A kind of hydraulic forced sealing structure and sealing method for valve

technical field

The invention belongs to the technical field of valves, and in particular relates to a hydraulic forced sealing structure and a sealing method for valves, which are especially suitable for ball valves and gate valves.

Background technique

For ball valves and gate valves in use in the market, if the diameter and rated pressure are increased, the opening and closing torque will increase significantly, and the wear of the seal will be accelerated, and the wear of the seal will lead to the failure of the sealing function.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the prior art, the present invention proposes a hydraulic forced sealing structure for valves after careful research and repeated tests. The parts will not be worn by the valve disc, which not only prolongs the service life of the valve, but also solves the problem of laborious operation of large-diameter ball valves and gate valves.

Another object of the present invention is to provide a hydraulic forced sealing method for a valve.

In order to achieve the above objects, the present invention adopts the following technical solutions.

A hydraulic forced sealing structure for a valve, including a valve body, a valve disc and an end cover, the valve disc is arranged in the cavity of the valve body, the valve disc is connected with the valve disc drive mechanism outside the valve body, and one end of the end cap is The closing bolt is connected with the valve body, and the other end of the end cover is provided with a closing hole and a sealing end surface connected with the pipeline flange; the valve body is provided with an axially movable sealing sleeve, and one end of the axially movable sealing sleeve is used for sealing The sealing end corresponds to the sealing surface on the valve disc. The other end of the axially moving sealing sleeve is the hydraulic driving end, which is communicated with the hydraulic system through the oil hole, and is controlled by the hydraulic system to move the sealing axially. The back-and-forth translation of the sleeve; the translation action of the axially moving sealing sleeve and the movement of the valve disc are performed alternately.

The valve is a ball valve or a gate valve, the disc of the ball valve is a valve ball, the disc of the gate valve is a gate plate, the disc of the ball valve is connected with the disc drive mechanism outside the valve body through the ball valve drive shaft, and the disc of the gate valve passes through the gate valve. The valve stem is connected with the disc drive mechanism outside the valve body.

As a preferred solution of the present invention, the axially movable sealing sleeve is in the shape of a straight cylinder.

As a preferred solution of the present invention, the axially movable sealing sleeve is stepped.

As a preferred solution of the present invention, one axially movable sealing sleeve is provided on one side of the valve disc, and the axially movable sealing sleeve is translated under the action of hydraulic force, or compresses the sealing surface on the valve disc, or off the sealing surface on the disc.

As a preferred solution of the present invention, two axially movable sealing sleeves are provided, and the two axially movable sealing sleeves are respectively arranged on corresponding two sides of the valve flap, and move synchronously and in opposite directions; that is, the two shafts Under the action of hydraulic force, the moving sealing sleeve moves in the opposite direction or synchronously to compress the sealing surface on the valve disc;

A hydraulic forced sealing method for a valve, comprising the following steps:

The first step is to move the axially movable sealing sleeve first, so that the axially movable sealing sleeve and the valve disc move away from the sealing surface of the valve disc; in the second step, move the valve disc in place; The sealing sleeve makes the axial moving sealing sleeve tightly press the sealing surface of the valve disc to meet the sealing requirements.

In the first step, when there are two axially movable sealing sleeves, the two axially movable sealing sleeves are synchronously moved away from the sealing surface on the valve flap.

In the second step, when the valve is a ball valve, the valve flap rotates 90° around the axis of the ball valve drive shaft; when the valve is a gate valve, the valve flap moves up or down.

In the third step, when there are two axially movable sealing sleeves, the two axially movable sealing sleeves are synchronously moved toward each other in translation to compress the sealing surface on the valve flap.

The beneficial effects of the present invention are as follows:

The present invention provides a hydraulic forced sealing structure for a valve, wherein the valve is a ball valve or a gate valve, the valve disc of the ball valve is a valve ball, and the valve disc of the gate valve is a gate plate. An axially movable sealing sleeve is arranged on the upper part, and one end of the axially movable sealing sleeve is the sealing end, which corresponds to the sealing surface on the valve disc, and the other end is the hydraulic driving end, which is connected to the hydraulic system through the oil hole. The hydraulic system controls the reciprocating translation of the axially moving sealing sleeve, and the hydraulic system controls the reciprocating translation of the axially moving sealing sleeve. Compared with gear transmission or other mechanical transmission structures, the axial movement of the sealing sleeve can be ensured. The sealing end of the valve disc and the sealing surface of the disc must have a pressure ratio, which can greatly reduce the movement resistance of the disc, prolong the service life of the sealing pair, and reduce the manufacturing cost of the gate valve and the ball valve; in the valve body of the ball valve or gate valve A valve flap driving mechanism is arranged on the outside, and the valve flap driving mechanism controls the movement of the valve flap. The movement of the valve flap and the movement of the axially moving sealing sleeve are controlled in linkage and are carried out alternately. When opening or closing the valve, first translate the axially moving sealing sleeve, so that the sealing end of the axially moving sealing sleeve leaves the sealing surface on the valve disc, and then move the valve disc in place (the disc of the ball valve The disc moves up and down), after the disc moves in place, the axially moving sealing sleeve that left the disc is moved back so that the sealing end of the axially moving sealing sleeve is pressed against the sealing surface of the disc to meet the sealing requirements. . It can be seen that during the opening and closing process of the valve, the sealing surface on the axially moving sealing sleeve will not be worn or cut by the valve disc, and the valve disc moves without frictional resistance from the sealing surface. At the same time, due to the aging of the sealing material The weakening of its elastic modulus or the wear of the sealing surface will not affect the sealing ratio of the valve disc and the seal, and the sealing performance is reliable. Compared with the prior art, the technology of the invention not only ensures the sealing effect of the valve, but also prolongs the service life of the valve, and the opening and closing operation is more labor-saving.

Description of drawings

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the technology of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the technology of the present invention, and are not used to limit the technology of the present invention.

FIG. 1 is a schematic structural diagram of Embodiment 1 of a hydraulic forced sealing structure for a valve according to the present invention.

FIG. 2 is a schematic structural diagram of Embodiment 2 of a hydraulic forced sealing structure for a valve according to the present invention.

3 is a schematic structural diagram of Embodiment 3 of a hydraulic forced sealing structure for a valve according to the present invention.

4 is a schematic structural diagram of Embodiment 4 of a hydraulic forced sealing structure for a valve of the present invention.

5 is a schematic structural diagram of Embodiment 5 of a hydraulic forced sealing structure for a valve according to the present invention.

6 is a schematic structural diagram of Embodiment 6 of a hydraulic forced sealing structure for a valve according to the present invention.

7 is a schematic structural diagram of Embodiment 7 of a hydraulic forced sealing structure for a valve according to the present invention.

FIG. 8 is a schematic structural diagram of Embodiment 8 of a hydraulic forced sealing structure for a valve according to the present invention.

Markings in the figure: 1 is the left ball valve end cover; 2 is the ball valve body; 3 is the ball valve disc; 4 is the ball valve drive shaft; 5 is the seal; 6 is the axial moving sealing sleeve; 7 is the right ball valve end cover ; 8 is the left gate valve end cover; 9 is the gate valve body; 10 is the gate valve disc; 11 is the gate valve stem; 12 is the right gate valve end cover.

Detailed ways

Below in conjunction with the accompanying drawings, a hydraulic forced sealing structure for a valve of the present invention will be explained in more detail.

Example 1

As shown in Figure 1, a hydraulic forced sealing structure for a valve, when used for a ball valve, includes the left ball valve end cover 1, the right ball valve end cover 7, the ball valve body 2, the ball valve disc 3, the ball valve transmission Shaft 4 and seal 5, the ball valve disc 3 is arranged in the inner cavity of the ball valve body 2, one end of the left ball valve end cover 1 and the right ball valve end cover 7 are connected with the ball valve body 2 through the closing bolt, and the other end is connected with the ball valve body 2. There is a handle hole and a sealing end face connected with the pipeline flange, and the ball valve disc 3 is connected with the disc drive mechanism outside the ball valve body 2 through the ball valve drive shaft 4; the ball valve body 2 is provided with an axial moving seal Sleeve 6, the structure of the axially movable sealing sleeve is a straight cylinder, one end of the axially movable sealing sleeve 6 is the sealing end, the sealing end corresponds to the sealing surface on the valve disc, and the other end of the axially movable sealing sleeve 6 is a liquid The hydraulic drive end is connected with the hydraulic system through the oil hole, and the hydraulic system controls the reciprocating translation of the axially movable sealing sleeve; when the ball valve is closed, the fluid pressure of the hydraulic system is used to drive the axially movable sealing sleeve 6 to translate, Press down the ball valve disc 3, and ensure that the sealing end of the axially moving sealing sleeve 6 and the sealing surface of the ball valve disc 3 have a specific pressure to meet the required sealing pressure; when the ball valve is opened, the fluid pressure in the pipeline is used to drive the axial movement The sealing sleeve 6 translates and leaves the ball valve disc 3, and ensures that the sealing ends of the axially moving sealing sleeve 6 do not contact each other when the ball valve disc 3 moves, which not only ensures that the sealing surfaces are not worn or cut by each other, but also greatly reduces the The movement resistance torque of the ball valve disc 3.

Two axially movable sealing sleeves 6 are provided, and the two axially movable sealing sleeves are respectively arranged on the corresponding two sides of the ball valve disc 3 , and the moving actions of the two axially movable sealing sleeves are synchronous and opposite. There are three steps to open or close the valve: the first step is to move the axially movable sealing sleeve 6 first, so that the axially movable sealing sleeves on both sides of the ball valve disc 3 are moved away from the sealing surfaces on both sides of the ball valve disc 3; In the second step, the ball valve disc 3 is rotated 90° around the axis of the ball valve drive shaft 4; in the third step, the axially moving sealing sleeve 6 is moved back so that the axially moving sealing sleeves on both sides of the ball valve disc 3 are tightly pressed against The sealing surfaces on both sides of the ball valve disc 3 meet the sealing requirements.

Example 2

As shown in FIG. 2, a hydraulic forced sealing structure for a valve, when used for a ball valve, the structure of the axially movable sealing sleeve 6 is stepped, and the matching surface on the corresponding ball valve body 2 is also set to Step-shaped, when the valve is closed, the fluid pressure of the hydraulic system is used to drive the axial moving sealing sleeve 6 to translate, press the ball valve disc 3, and ensure the sealing ratio between the sealing end of the axially moving sealing sleeve 6 and the sealing surface of the ball valve disc 3 When the valve is opened, the fluid pressure in the pipeline and the fluid pressure of the hydraulic system are used to drive the axially moving sealing sleeve 6 to translate, leaving the ball valve disc 3, and other specific structures are the same as those in Embodiment 1.

Example 3

As shown in Figure 3, a hydraulic forced sealing structure for a valve, the axially movable sealing sleeve 6 is provided with one, and other specific structures are the same as those in Embodiment 1.

Example 4

As shown in Figure 4, a hydraulic forced sealing structure for a valve, the axially movable sealing sleeve 6 is provided with one, and other specific structures are the same as those in Embodiment 2.

Example 5

As shown in Figure 5, a hydraulic forced sealing structure for a valve, when used for a gate valve, includes a left gate valve end cover 8, a right gate valve end cover 12, a gate valve body 9, a gate valve disc 10, and a seal 5 and the gate valve stem 11, the gate valve disc 10 is arranged in the inner cavity of the gate valve body 9, one end of the left gate valve end cover 8 and the right gate valve end cover 12 is connected with the gate valve body 9 by the closing bolt, and the other end is connected with the gate valve body 9. There is a closing hole and a sealing end face connected with the pipeline flange, and the gate valve disc 10 is connected with the valve disc drive mechanism outside the gate valve body 9 through the gate valve stem 11; the gate valve body 9 is provided with an axially movable seal Sleeve 6, the structure of the axially movable sealing sleeve is a straight cylinder; one end of the axially movable sealing sleeve 6 is a sealing end, and the sealing end corresponds to the sealing surface on the valve disc, and the other end of the axially movable sealing sleeve 6 is a liquid The hydraulic drive end is connected with the hydraulic system through the oil hole, and the hydraulic system controls the reciprocating translation of the axially movable sealing sleeve; when the gate valve is closed, the fluid pressure of the hydraulic system is used to drive the axially movable sealing sleeve 6 to translate, Compress the gate valve disc 10, and ensure that the sealing end of the axially moving sealing sleeve 6 and the sealing surface of the gate valve disc 10 meet the necessary sealing pressure ratio; when the gate valve is opened, the fluid pressure in the pipeline is used to drive the axial movement The sealing sleeve 6 moves in translation and leaves the gate valve disc 10, and ensures that the sealing ends of the axially moving sealing sleeve 6 do not contact each other when the gate valve disc 10 moves, which can not only ensure that the sealing surfaces are not worn or cut by each other, but also greatly reduce Movement resistance of the gate valve disc 10.

Two axially movable sealing sleeves 6 are provided, and the two axially movable sealing sleeves are respectively disposed on the corresponding two sides of the gate valve disc 10 , and the moving actions of the two axially movable sealing sleeves are synchronous and opposite. There are three steps to open or close the valve: the first step is to move the axially movable sealing sleeve 6 first, so that the axially movable sealing sleeves on both sides of the gate valve disc 10 are moved away from the sealing surfaces on both sides of the gate valve disc 10; The second step is to move the gate valve disc 10 in place; the third step is to move back the axially movable sealing sleeve 6 so that the axially movable sealing sleeves on both sides of the gate valve disc 10 are pressed against the sealing surfaces on both sides of the gate valve disc 10 , to meet sealing requirements.

Example 6

As shown in Figure 6, a hydraulic forced sealing structure for valves, the axially movable sealing sleeve 6 has a stepped structure, and the corresponding mating surface on the valve body 9 of the gate valve is also set to a stepped shape, and the valve is closed. At the same time, the fluid pressure of the hydraulic system is used to drive the axially moving sealing sleeve 6 to translate, compress the gate valve disc 10, and ensure that the sealing end of the axially moving sealing sleeve 6 and the sealing surface of the gate valve disc 10 meet the sealing requirements. Specific pressure; when the valve is opened, the fluid pressure in the pipeline and the fluid pressure of the hydraulic system are used to drive the axially moving sealing sleeve 6 to translate and leave the gate valve disc 10. Other specific structures are the same as those in Embodiment 5.

Example 7

As shown in Figure 7, a hydraulic forced sealing structure for a valve, one of the axially movable sealing sleeves 6 is provided, and other specific structures are the same as those in Embodiment 5.

Example 8

As shown in Figure 8, a hydraulic forced sealing structure for a valve, the axially movable sealing sleeve 6 is provided with one, and other specific structures are the same as the embodiment 6.

The installation methods, connection methods or setting methods of all the above-mentioned components are common mechanical connection methods. The sliding/rotational fixation means that they do not fall off in the sliding/rotating state, and the specific structure, model and coefficient index of all the components are Its own technology can be implemented as long as it can achieve its beneficial effects, so it will not be repeated here.

For the convenience of description, the above-mentioned "left", "right", "up" and "down" are consistent with the left, right, upper and lower directions of the accompanying drawings, but do not limit the structure of the present invention. , the terms "comprising", "comprising" are intended to encompass a non-exclusive inclusion, which includes other elements not expressly listed, or which are also inherent to such a process, method, article or apparatus.

The above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced to achieve The same technical effect; as long as it meets the needs of use, it all falls within the protection scope of the present invention.

Claims (10)

1. A hydraulic forced sealing structure for a valve, comprising a valve body, a valve disc and an end cap, the valve disc is arranged in the cavity of the valve body, the valve disc is connected with the valve disc drive mechanism outside the valve body, and one end of the end cap is By connecting the closing bolt with the valve body, the other end of the end cover is provided with a closing hole and a sealing end surface connected with the pipeline flange; it is characterized in that the valve body is provided with an axially movable sealing sleeve, and the axially movable sealing sleeve is provided on the valve body. One end of the sleeve is the sealing end, and the sealing end corresponds to the sealing surface on the valve disc. The other end of the axially moving sealing sleeve is the hydraulic driving end, which is communicated with the hydraulic system through the oil hole, and is connected by the hydraulic system. The reciprocating translation of the axially moving sealing sleeve is controlled; the translational movement of the axially moving sealing sleeve and the movement of the valve flap are alternately performed. 2. The hydraulic forced sealing structure for a valve according to claim 1, wherein the valve is a ball valve or a gate valve, the valve disc of the ball valve is a valve ball, and the valve disc of the gate valve is a gate plate, The disc of the ball valve is connected with the disc drive mechanism outside the valve body through the ball valve drive shaft, and the disc of the gate valve is connected with the disc drive mechanism outside the valve body through the gate valve stem. 3 . The hydraulic forced sealing structure for a valve according to claim 1 , wherein the axially movable sealing sleeve is in the shape of a straight cylinder. 4 . 4 . The hydraulic forced sealing structure for a valve according to claim 1 , wherein the axially movable sealing sleeve is stepped. 5 . 5. A hydraulic forced sealing structure for a valve according to claim 1, characterized in that one axially movable sealing sleeve is provided on one side of the valve flap, and one axially movable sealing sleeve is installed in the liquid Translate under the action of force, or press the sealing surface on the disc, or leave the sealing surface on the disc. 6 . The hydraulic forced sealing structure for a valve according to claim 1 , wherein two axially movable sealing sleeves are provided, and the two axially movable sealing sleeves are respectively arranged on the corresponding positions of the valve disc. 7 . On both sides, and move synchronously and in opposite directions; that is, the two axially moving sealing sleeves move in the opposite direction under the action of hydraulic force or synchronously translate, pressing the sealing surface on the valve disc; or synchronously translate in opposite directions, leaving the seal on the valve disc noodle. 7. A hydraulic forced sealing method for a valve, characterized in that it comprises the following steps: The first step is to move the axially movable sealing sleeve first, so that the axially movable sealing sleeve and the valve disc move away from the sealing surface of the valve disc; in the second step, move the valve disc in place; The sealing sleeve makes the axial moving sealing sleeve tightly press the sealing surface of the valve disc to meet the sealing requirements. 8. A method for hydraulic forced sealing of a valve according to claim 7, wherein in the first step, when two axially movable sealing sleeves are arranged, the two axially movable sealing sleeves are Synchronously translate back and forth away from the sealing surface on the disc. 9. A kind of hydraulic forced sealing method for valve according to claim 7, it is characterized in that in the described second step, when the valve is a ball valve, the valve flap rotates 90° around the axis of the ball valve drive shaft ; When the valve is a gate valve, the disc moves up or down. 10 . The method for hydraulic forced sealing of a valve according to claim 7 , wherein in the third step, when two axially movable sealing sleeves are set, the two axially movable sealing sleeves are 10 . Simultaneously move towards each other to compress the sealing surface on the disc.

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