Valve power assisting device

Abstract

The invention relates to the technical field of petroleum and natural gas extraction, in particular to a valve power assisting device. The valve power assisting device comprises an oil storage cylinder. A first cavity with pressure transmission liquid is formed between the outer wall of the piston cylinder and the inner wall of the oil storage cylinder; the piston cylinder comprises a second cavity and a third cavity, the second cavity and the third cavity are communicated with each other, and the second cavity and the third cavity are respectively communicated with the first cavity; the first piston is arranged in the second cavity, one end of the first piston is connected with the first transmission part, the second piston is arranged in the third cavity, and the end, away from the first piston, of the second piston is connected with the second transmission part; and when the first piston is subjected to the acting force of the first transmission part, the first piston moves towards the second piston, so that the pressure transmission liquid in the second cavity is pushed into the third cavity and the second piston is pushed to move, and the second transmission part outputs the acting force outwards. According to the valve power assisting device, the opening and closing efficiency of the valve can be improved.

Description

Technical Field

[0001] This application relates to the technical field of oil and gas exploitation, and particularly to a valve boosting device. Background Art

[0002] In the field of oil and gas exploitation, wellhead valves, as the core devices for pressure regulation, undertake the key function of safely reducing high-pressure natural gas to the tolerance range of downstream pipelines or equipment. Their reliability is directly related to the continuous production of oil and gas wells and on-site safety. Especially in high-pressure working conditions or emergency shutdown scenarios, whether the valve can be opened and closed in a timely and effective manner directly affects the accident prevention and control ability.

[0003] Existing valves usually achieve opening and closing through mechanical manual operation.

[0004] However, when the pressure in the well is too high, the torque for opening and closing the valve will also increase, which will bring inconvenience to on-site operation and affect the efficiency of valve opening and closing. Summary of the Invention

[0005] An embodiment of this application provides a valve boosting device, which helps to reduce the torque when manually opening and closing the valve, so as to improve the efficiency of valve opening and closing.

[0006] An embodiment of this application provides a valve boosting device for assisting in operating a valve, including: an oil storage cylinder; a piston cylinder disposed inside the oil storage cylinder, a first cavity is formed between the outer wall of the piston cylinder and the inner wall of the oil storage cylinder, and a pressure transmission fluid is provided in the first cavity; the piston cylinder includes: a second cavity and a third cavity, the size of the third cavity is larger than that of the second cavity, the second cavity and the third cavity are communicated with each other, and the second cavity and the third cavity are respectively communicated with the first cavity; a first piston and a second piston, the size of the second piston is larger than that of the first piston, the first piston is disposed inside the second cavity, one end of the first piston is connected to a first transmission member, the second piston is disposed inside the third cavity, and the end of the second piston away from the first piston is connected to a second transmission member; wherein, when the first piston is subjected to the force of the first transmission member, the first piston moves towards the second piston to push the pressure transmission fluid in the second cavity into the third cavity and push the second piston to move, so that the second transmission member outputs an external force.

[0007] In a possible implementation manner, the valve boosting device further includes: a piston cylinder head disposed at one end of the second cavity away from the third cavity, and the second cavity is communicated with the first cavity through the piston cylinder head.

[0008] In a possible implementation, a connection hole is provided on the piston cylinder head, and the first transmission member passes through the connection hole and is connected to the first piston; the piston cylinder head includes: a first connection portion, a through hole is provided on the first connection portion, and the through hole is used to communicate the first cavity and the second cavity; a second connection portion, the first connection portion and the second connection portion are sequentially arranged in the radially outward direction along the piston cylinder head, and a sealing groove is provided on the side surface of the second connection portion away from the first connection portion.

[0009] In a possible implementation, the first piston is of a cylindrical structure, at least a part of the first piston along the axial direction is in clearance fit with the second cavity; a threaded groove is provided at one end of the first piston close to the piston cylinder head, an external thread is provided on the first transmission member, and the first transmission member is in threaded fit with the first piston; a hydraulic ring groove is further provided on the side wall of the first piston, and when the hydraulic ring groove is opposite to the through hole, the pressure transmission fluid enters the hydraulic ring groove through the through hole.

[0010] In a possible implementation, the second cavity includes a first section and a second section along its axial direction, the inner diameter of the first section is smaller than the inner diameter of the second section; the first piston abuts against the inner wall of the first section, and there is a gap between the first piston and the inner wall of the second section, and the first piston is configured to, when moving from the first section to the second section, squeeze the pressure transmission fluid in the hydraulic ring groove into the second section.

[0011] In a possible implementation, a flow passage is provided between the second cavity and the third cavity, and a check valve is provided in the flow passage.

[0012] In a possible implementation, the check valve includes a mounting groove, a limiting groove and a check valve ball, the check valve ball is arranged in the mounting groove, the limiting groove is arranged at one end of the mounting groove close to the third cavity, and the limiting groove is used to limit the movement range of the check valve ball.

[0013] In a possible implementation, a first return hole is provided on the third cavity, and the third cavity is connected to the first cavity through the first return hole; the oil storage cylinder further includes a through hole and a plug, the through hole penetrates the oil storage cylinder and corresponds to the first return hole, and the plug is configured to, when the first piston moves towards the third cavity, the plug blocks the through hole and the first return hole, and when the first piston moves away from the third cavity, the plug conducts the first return hole.

[0014] In a possible implementation, a second return hole is further provided on the third cavity. The first return hole and the second return hole are distributed along the axial direction of the third cavity. The first return hole is located between the flow passage and the second return hole. The second piston is adapted to move between the first return hole and the second return hole.

[0015] In a possible implementation, the oil storage cylinder further includes an oil storage cylinder body and an oil storage cylinder cover. The oil storage cylinder cover is hermetically connected to the oil storage cylinder body through a fastener.

[0016] The valve boosting device provided by the present application forms a hydraulic amplification effect by utilizing the cross-sectional area difference between the second cavity and the third cavity, converts the small force applied by the operator on the first transmission member into a multiplied mechanical force output by the second transmission member, effectively reduces the torque required for manual operation, and improves the efficiency of valve opening and closing. At the same time, the closed-loop flow path of the pressure transmission fluid between the three cavities can avoid the risk of external leakage, and the integrated structure of the piston cylinder and the oil storage cylinder maintains the installation compatibility with the existing manual wheel disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0018] Figure 1 is a schematic structural diagram of the valve boosting device provided by the present application;

[0019] Figure 2 is a schematic structural diagram of the first transmission member provided by the present application;

[0020] Figure 3 is a schematic structural diagram of the oil storage cylinder cover provided by the present application;

[0021] Figure 4 is a schematic structural diagram of the piston cylinder cover provided by the present application;

[0022] Figure 5 is a schematic structural diagram of the first piston provided by the present application;

[0023] Figure 6 is a schematic structural diagram of the piston cylinder provided by the present application;

[0024] Figure 7 is a schematic structural diagram of the check valve provided by the present application.

[0025] DESCRIPTION OF REFERENCE NUMERALS:

[0026] 1 - Valve boosting device;

[0027] 10 - Oil storage cylinder; 11 - Oil storage cylinder body; 12 - Oil storage cylinder cover; 13 - Flow - through hole; 14 - Plug

[0028] 20 - Piston cylinder; 21 - Second cavity; 211 - First section; 212 - Second section; 22 - Third cavity; 221 - First return hole; 222 - Second return hole; 23 - First piston; 231 - Hydraulic ring groove; 24 - Second piston; 25 - Flow - through channel; 26 - Check valve; 261 - Installation groove; 262 - Limiting groove; 263 - Check valve ball

[0029] 30 - First cavity

[0030] 40 - First transmission part

[0031] 50 - Second transmission part

[0032] 60 - Piston cylinder cover; 61 - Connection hole; 62 - First connection part; 621 - Through - hole; 63 - Second connection part; 631 - Sealing groove

[0033] Through the above - mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed embodiments

[0034] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0035] As shown in the background art, existing valves usually achieve opening and closing by means of mechanical manual operation. However, when the pressure in the well is too high, the torque for opening and closing the valve will also increase, which will bring inconvenience to on - site operation and affect the efficiency of valve opening and closing. It should be understood that mechanical valves need to transmit torque through devices such as handwheels, valve stem threads, and extension levers.

[0036] In view of this, the present application provides a valve boosting device, which utilizes the cross-sectional area difference between the second cavity and the third cavity to form a hydraulic amplification effect, converts the small force applied by the operator on the first transmission member into the multiplied mechanical force output by the second transmission member, effectively reduces the torque required for manual operation, and improves the efficiency of valve opening and closing. At the same time, the closed-loop flow path of the pressure transmission fluid among the three cavities can avoid the risk of external leakage, and the integrated structure of the piston cylinder and the oil storage cylinder maintains the installation compatibility with the existing manual wheel disc.

[0037] Reference is made below Figure 1 、 Figure 2 to describe a valve boosting device 1 provided by an embodiment of the present application for oil and gas extraction.

[0038] The valve boosting device 1 includes an oil storage cylinder 10 and a piston cylinder 20. A pressure transmission fluid is provided in the oil storage cylinder 10. The piston cylinder 20 can be disposed within the oil storage cylinder 10. And there is a gap between the piston cylinder 20 and the oil storage cylinder 10. That is, a first cavity 30 is formed between the outer wall of the piston cylinder 20 and the inner wall of the oil storage cylinder 10. The first cavity 30 is filled with the pressure transmission fluid.

[0039] The piston cylinder 20 includes a second cavity 21, a third cavity 22, a first piston 23 and a second piston 24. The second cavity 21 and the third cavity 22 communicate with each other. And the second cavity 21 and the third cavity 22 communicate with the first cavity 30 respectively. Among them, the size of the third cavity 22 is larger than that of the second cavity 21.

[0040] Further, the first piston 23 is disposed within the second cavity 21. The second piston 24 is disposed within the third cavity 22. And the size of the second piston 24 is larger than that of the first piston 23. Among them, one end of the first piston 23 can be connected to the first transmission member 40. The end of the second piston 24 away from the first piston 23 can be connected to the second transmission member 50. When the first piston 23 is subjected to the force of the first transmission member 40, the first piston 23 can move towards the second piston 24 to push the pressure transmission fluid in the second cavity 21 into the third cavity 22 and push the second piston 24 to move, so that the second transmission member 50 outputs an acting force externally. In a specific implementation process, the second transmission member 50 can apply an acting force to the valve core to drive the valve core to move, ensuring reliable opening and closing of the valve under high pressure.

[0041] Optionally, a handwheel may be provided at one end of the first transmission member 40. The operator drives the first transmission member 40 to rotate circumferentially by rotating the handwheel. Further, a threaded groove is provided at one end of the first piston 23. External threads may be provided at the other end of the first transmission member 40. In this way, the first transmission member 40 can be in threaded engagement with the first piston 23. Moreover, the first transmission member 40 can pass through the oil storage cylinder 10 and be threadedly connected to the first piston 23. Threads are also provided at the portion of the oil storage cylinder 10 in contact with the first transmission member 40 to convert the circumferential rotational movement of the first transmission member 40 into an axial feed movement, thereby pushing the first piston 23 to move.

[0042] It can be understood that for the valve boosting device 1 provided in the embodiment of the present application, the hydraulic amplification effect is formed by the cross-sectional area difference between the second cavity 21 and the third cavity 22, converting the small force applied by the operator on the first transmission member 40 into the multiplied mechanical force output by the second transmission member 50, effectively reducing the torque required for manual operation to improve the efficiency of valve opening and closing. At the same time, the closed-loop flow path of the pressure transmission fluid among the three cavities can avoid the risk of external leakage, and the integrated structure of the piston cylinder 20 and the oil storage cylinder 10 maintains the installation compatibility with the existing manual wheel disc.

[0043] In a possible implementation manner, referring to Figure 1 , Figure 4 , the valve boosting device 1 further includes a piston cylinder head 60. The piston cylinder head 60 may be provided at one end of the second cavity 21 away from the third cavity 22. Moreover, the second cavity 21 communicates with the first cavity 30 through the piston cylinder head 60. Optionally, the second cavity 21 and the piston cylinder head 60 may be connected by flange bolts. Alternatively, the second cavity 21 and the piston cylinder head 60 may also be sealed by a composite of a metal sheet and an elastomer. The second cavity 21 and the piston cylinder head 60 may be sealed by a metal ring. And a flexible graphite winding gasket may be filled outside the metal ring.

[0044] In a possible implementation manner, referring to Figure 1 , Figure 4 , a connection hole 61 is provided on the piston cylinder head 60. The first transmission member 40 can pass through the oil storage cylinder 10 and be connected to the first piston 23 through the connection hole 61.

[0045] Furthermore, the piston cylinder head 60 includes a first connecting portion 62 and a second connecting portion 63. The first connecting portion 62 and the second connecting portion 63 are arranged in sequence in the radially outward direction of the piston cylinder head 60. That is, the first connecting portion 62 is disposed in the middle of the piston cylinder head 60. The second connecting portion 63 is disposed at the edge portion of the piston cylinder head 60. And, a sealing groove 631 is provided on the second connecting portion 63. Specifically, the sealing groove 631 is provided on the side surface of the second connecting portion 63 away from the first connecting portion 62. In order to realize the communication between the first cavity 30 and the second cavity 21, a through hole 621 is provided in the first connecting portion 62.

[0046] Optionally, the first connecting portion 62 and the second connecting portion 63 may be annular boss structures. The second connecting portion 63 may be in interference fit with the inner wall of the oil storage cylinder 10. The through holes 621 on the first connecting portion 62 may be multiple. The multiple through holes 621 may be circumferentially spaced apart along the first connecting portion 62. Or, the multiple through holes 621 may be arranged in a spiral on the circumference of the first connecting portion 62 to guide the tangential flow of the fluid. And, the diameters of the multiple through holes 621 may gradually change along the flow direction of the fluid to adapt to the dynamic change of the flow rate. In addition, a metal filter element may be provided in each through hole 621 to filter impurities that may exist in the pressure transmission fluid.

[0047] In a possible implementation manner, referring to Figure 1 、 Figure 5 , the first piston 23 may be a cylindrical structure. A part of the structure of the first piston 23 may be in clearance fit with the second cavity 21. Specifically, at least a part of the first piston 23 along the axial direction is in clearance fit with the second cavity 21. For example, the first piston 23 may be a dumbbell-shaped structure. That is, the middle dimension of the first piston 23 is smaller than the dimensions of both ends of the first piston 23. Specifically, a hydraulic ring groove 231 is provided on the side wall of the middle part of the first piston 23. In this way, both ends of the first piston 23 can be respectively attached to the inner wall of the second cavity 21. And the hydraulic ring groove 231 of the first piston 23 may be in clearance fit with the second cavity 21 to form a space that can store the pressure transmission fluid. And, when the hydraulic ring groove 231 is opposite to the through hole 621, the pressure transmission fluid can enter the hydraulic ring groove 231 through the through hole 621.

[0048] It can be understood that both ends of the first piston 23 are closely attached to the inner wall of the second cavity 21 to form a reliable axial seal and reduce the lateral leakage of the pressure transmission fluid; a circular gap is formed between the hydraulic ring groove 231 in the middle of the first piston 23 and the second cavity 21, which can provide a temporary storage space for the pressure transmission fluid when the piston moves. When the through hole 621 corresponds to the hydraulic ring groove 231 in position, the pressure transmission fluid can enter the hydraulic ring groove 231 through the through hole 621 to achieve pressure balance in the second cavity 21.

[0049] In a possible implementation, referring to Figure 1 , Figure 6 , the second cavity 21 may include a first section 211 and a second section 212. Among them, the first section 211 and the second section 212 may be distributed along the axial direction of the second cavity 21. The first section 211 may be disposed close to the piston cylinder head 60, and the second section 212 may be disposed close to the third cavity 22. And, the inner diameter of the first section 211 is smaller than the inner diameter of the second section 212. Further, both ends of the first piston 23 may be in contact with the inner wall of the first section 211. And there may be a gap between both ends of the first piston 23 and the inner wall of the second section 212. In this way, the first piston 23 may be configured to squeeze the pressure transmission fluid in the hydraulic ring groove 231 into the second section 212 when moving from the first section 211 to the second section 212.

[0050] It can be understood that the first section 211 of the second cavity 21 has a smaller inner diameter, and close contact with both ends of the first piston 23 can form a dynamic seal to reduce the leakage of the pressure transmission fluid. When the first piston 23 moves from the first section 211 to the second section 212, the gap formed between both ends of it and the inner wall of the second section 212 allows the pressure transmission fluid stored in the hydraulic ring groove 231 to be squeezed into the second section 212, thereby pushing the second piston 24 to move. The stepped cavity structure of the second cavity 21 guides the directional flow of the pressure transmission fluid through the inner diameter difference to optimize the pressure transmission efficiency, while reducing the frictional resistance during the piston movement and improving the smoothness of the valve opening and closing operation.

[0051] In a possible implementation, referring to Figure 1 , Figure 6 , Figure 7 , a flow passage 25 is provided between the second cavity 21 and the third cavity 22. A check valve 26 is also provided in the flow passage 25. Optionally, the flow passage 25 may be an expanding conical flow passage to reduce the flow resistance.

[0052] It can be understood that the check valve 26 only allows the pressure transmission fluid to flow from the second cavity 21 to the third cavity 22, and prevents the pressure transmission fluid in the third cavity 22 from flowing back into the second cavity 21 in the reverse direction, so as to prevent the ineffective circulation of the pressure transmission fluid caused by the backflow and ensure the pressure stability in the oil storage cylinder 10. In addition, the check valve 26 can also block the backflow of particulate matter (such as metal debris) in the third cavity 22 to reduce the wear of the first piston 23 in the second cavity 21.

[0053] In a possible implementation, referring to Figure 7The check valve 26 includes a mounting groove 261, a limiting groove 262 and a check valve ball 263. The check valve ball 263 is arranged in the mounting groove 261. The limiting groove 262 is arranged at one end of the mounting groove 261 close to the third cavity 22. The limiting groove 262 is used to limit the range of movement of the check valve ball 263. In the specific implementation process, when the pressure in the second cavity 21 increases, the pressure transmission fluid will push the check valve ball 263 to move toward the third cavity 22, so that it will break away from the sealing surface at the outlet end of the mounting groove 261; the valve ball slides axially in the mounting groove 261 to the maximum displacement position allowed by the limiting groove 262. At this time, the annular wall of the limiting groove 262 or the blocking valve ball continues to move to form a stable flow channel, and the pressure transmission fluid enters the third cavity 22 through the annular gap between the check valve ball 263 and the inner wall of the mounting groove 261. In this state, the check valve ball 263 is suspended in the installation groove 261, and is kept in the middle position by the fluid dynamic pressure of the pressure transmission fluid to avoid hard contact with the groove wall. When the pressure is balanced or a reverse pressure difference occurs, the check valve ball 263 quickly returns to its position under the action of gravity to block the backflow. The limit groove 262 ensures that the check valve ball 263 moves within a controllable range through mechanical constraints, which can not only ensure smooth forward flow, but also prevent excessive displacement from causing sealing failure.

[0054] In one possible implementation, reference Figure 1 , Figure 6 , a first reflux hole 221 is provided on the third cavity 22. The third cavity 22 can be connected to the first cavity 30 through the first reflux hole 221. The oil storage cylinder 10 also includes a through-hole 13 and a plug 14. The through-hole 13 runs through the oil storage cylinder 10 and corresponds to the first reflux hole 221. The plug 14 is used to block the through-hole 13 and the first reflux hole 221. The plug 14 is configured such that when the first piston 23 moves toward the third cavity 22, the plug 14 blocks the through-hole 13 and the first reflux hole 221, and when the first piston 23 moves away from the third cavity 22, the plug 14 conducts the first reflux hole 221.

[0055] Optionally, the plug 14 can be a conical structure. The plug 14 is provided with a hexagon socket bolt hole to facilitate the installation and adjustment of the position of the plug 14. The plug 14 is also provided with a sealing groove 631 to further ensure the sealing effect. The front end of the plug 14 can be processed into a conical surface with a certain angle, and cooperate with the conical seat on the inner wall of the through hole 13 and the first return hole 221. In addition, the plug 14 can also have a built-in disc spring to provide radial pressure to ensure that the conical surface fits. Further, in order to improve the sealing performance, the outer wall of the plug 14 can also be grooved, and a fluororubber O-ring can be embedded in the groove. Alternatively, the plug 14 can be provided with an external thread, and the inner wall of the through hole 13 and the first return hole 221 is provided with an internal thread. In this way, the plug 14 can be threadedly matched with the through hole 13 and the first return hole 221. Alternatively, the plug 14 can be magnetically matched with the through hole 13 and the first return hole 221.

[0056] In the specific implementation process, the plug 14 is used to block the flow-through hole 13 and the first return hole 221, blocking the return path of the third cavity 22 to the first cavity 30, forcing all the pressure transmission fluid to enter the third cavity 22 and push the second piston 24 to move, avoiding energy loss. The plug 14 can avoid the reverse flow of the pressure transmission fluid and the resulting pressure fluctuations during the driving stage (such as the valve closing stage), ensuring the stability of the output force. After the plug 14 releases the blockage, the pressure transmission fluid in the third cavity 22 can return to the first cavity 30 through the first return hole 221 to replenish the cavity in the first cavity 30.

[0057] In a possible implementation manner, referring to Figure 1 , Figure 6 , a second return hole 222 is further provided on the third cavity 22. The first return hole 221 and the second return hole 222 can be spaced apart on the third cavity 22. Specifically, the first return hole 221 and the second return hole 222 can be distributed along the axial direction of the third cavity 22. The first return hole 221 can be located between the flow-through channel 25 and the second return hole 222. And the second piston 24 is adapted to move between the first return hole 221 and the second return hole 222. Optionally, chamfers can be provided at both ends of the second piston 24 to facilitate the movement of the second piston 24.

[0058] In the specific implementation process, when the second piston 24 is pushed by the pressure transmission fluid and moves towards the second return hole 222, by opening the plug 14, the pressure transmission fluid can flow back to the first cavity 30 through the first return hole 221, realizing staged pressure relief in the high-pressure stage. As the pressure transmission fluid flows back to the first cavity 30 through the first return hole 221, the second piston 24 gradually moves towards the first return hole 221 direction, and then the second return hole 222 is opened. The pressure transmission fluid in the first cavity 30 can flow back into the third cavity 22 through the second return hole 222, and further push the second piston 24 towards the first return hole 221 direction to realize the rapid reset of the second piston 24.

[0059] In a possible implementation manner, referring to Figure 1 , Figure 3, the oil storage cylinder 10 further includes an oil storage cylinder body 11 and an oil storage cylinder cover 12. The oil storage cylinder cover 12 is hermetically connected to the oil storage cylinder body 11 through fasteners to ensure the sealing performance of the oil storage cylinder 10. Optionally, the oil storage cylinder cover 12 is provided with a countersunk hexagon socket head hole and a threaded hole. The fasteners can pass through the countersunk hexagon socket head hole and the threaded hole to fix the oil storage cylinder body 11 and the oil storage cylinder cover 12. Multiple threaded holes can be provided on the oil storage cylinder cover 12. The multiple threaded holes can be distributed at intervals along the circumferential direction of the oil storage cylinder cover 12. Further, a groove is provided on one side of the oil storage cylinder cover 12. The shape of the groove can be adapted to the piston cylinder cover 60 to be used for pressing the piston cylinder cover 60. In addition, a sealing groove 631 is also provided inside the oil storage cylinder cover 12 to ensure the sealing effect of the part where the oil storage cylinder 10 contacts the first transmission member 40. Similarly, a sealing groove 631 is also provided inside the oil storage cylinder body 11 to ensure the sealing effect of the part where the oil storage cylinder body 11 contacts the second transmission member 50.

[0060] Optionally, in order to fix the piston cylinder 20, a fixing groove is further provided at one end of the oil storage cylinder body 11 away from the oil storage cylinder cover 12. The fixing groove can fix the piston cylinder 20. Specifically, the fixing groove can be connected to the third cavity 22 of the piston cylinder 20. The outer wall of the third cavity 22 can be in interference fit with the fixing groove to achieve sealing and fixing.

[0061] The process of opening and closing the valve by the valve assist device 1 will be described in detail below. In the valve closing stage, the operator can rotate the handwheel to drive the first transmission member 40 to rotate. Due to the threaded fit between the first transmission member 40 and the oil storage cylinder cover 12, its rotational motion is converted into an axial movement, and then the first piston 23 is pushed to move in the direction of the second piston 24 (i.e., the direction of the third cavity 22). When the first piston 23 moves, the pressure transmission fluid in the second cavity 21 is squeezed and enters the third cavity 22 along the flow passage 25. Since the check valve 26 is provided in the flow passage 25, it can ensure that the pressure transmission fluid flows into the third cavity 22 unidirectionally and pushes the second piston 24 to move, while blocking the reverse flow. As the pressure transmission fluid continues to be injected into the third cavity 22, the second piston 24 is affected by the hydraulic thrust and drives the second transmission member 50 to move axially. The second transmission member 50 is connected to the valve core, and based on Pascal's principle, the amplified hydraulic force is transmitted to the valve core to achieve the labor-saving closing of the valve.

[0062] During the valve opening stage, the operator rotates the handwheel in the reverse direction to reset the first piston 23 to its initial position. And the plug 14 is set to the conducting state. At this time, the pressure transmission fluid in the third cavity 22 flows back to the first cavity 30 of the oil storage cylinder 10 through the first return hole 221 and the flow hole 13, thereby causing the second piston 24 to move towards the second cavity 21. As the second piston 24 moves towards the second cavity 21, the second return hole 222 gradually opens, and thus the pressure transmission fluid in the first cavity 30 can flow back reversely into the third cavity 22, so as to assist the second piston 24 to move towards the second cavity 21. The movement of the second piston 24 towards the second cavity 21 can also drive the second transmission member 50 to move reversely to drive the valve to open.

[0063] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0064] The devices or elements referred to in the embodiments of the present application or implied must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise precisely and specifically specified.

[0065] The terms "first", "second", "third", "fourth", etc. (if any) in the description of the specification, claims and the above drawings of the embodiments of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0066] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0067] The term "a plurality of" in this article refers to two or more. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0068] It should be understood that the various numerical numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application.

[0069] It should be understood that in the embodiments of the present application, the magnitude of the sequence numbers of the above processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0070] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0071] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A valve assist device (1) for assisting in the operation of a valve, characterized in that, Comprising: An oil storage cylinder (10); A piston cylinder (20), disposed within the oil storage cylinder (10), a first cavity (30) being formed between the outer wall of the piston cylinder (20) and the inner wall of the oil storage cylinder (10), and a pressure transmission fluid being provided within the first cavity (30); The piston cylinder (20) includes: A second cavity (21) and a third cavity (22), the size of the third cavity (22) being larger than that of the second cavity (21), the second cavity (21) and the third cavity (22) being in communication with each other, and the second cavity (21) and the third cavity (22) being respectively in communication with the first cavity (30); A first piston (23) and a second piston (24), the size of the second piston (24) being larger than that of the first piston (23), the first piston (23) being disposed within the second cavity (21), one end of the first piston (23) being connected to a first transmission member (40), the second piston (24) being disposed within the third cavity (22), and the end of the second piston (24) remote from the first piston (23) being connected to a second transmission member (50); Wherein, when the first piston (23) is subjected to the acting force of the first transmission member (40), the first piston (23) moves towards the second piston (24) to push the pressure transmission fluid within the second cavity (21) into the third cavity (22) and push the second piston (24) to move, such that the second transmission member (50) outputs an acting force externally.

2. The valve boosting device (1) according to claim 1, characterized in that, The valve assist device (1) further includes: a piston cylinder head (60), the piston cylinder head (60) being disposed at the end of the second cavity (21) remote from the third cavity (22), and the second cavity (21) being in communication with the first cavity (30) through the piston cylinder head (60).

3. The valve boosting device (1) according to claim 2, characterized in that, A connection hole (61) is formed in the piston cylinder head (60), and the first transmission member (40) passes through the connection hole (61) and is connected to the first piston (23); The piston cylinder head (60) includes: A first connection portion (62), a through hole (621) being formed in the first connection portion (62) for communicating the first cavity (30) and the second cavity (21); A second connection portion (63), the first connection portion (62) and the second connection portion (63) being sequentially disposed in a direction radially outward along the piston cylinder head (60), and a sealing groove (631) being provided on the side surface of the second connection portion (63) remote from the first connection portion (62).

4. The valve boosting device (1) according to any one of claims 3, characterized in that, The first piston (23) has a cylindrical structure, and at least a part of the first piston (23) in the axial direction is in clearance fit with the second cavity (21); A threaded groove is formed at one end of the first piston (23) close to the piston cylinder head (60), an external thread is provided on the first transmission member (40), and the first transmission member (40) is in threaded fit with the first piston (23); The side wall of the first piston (23) is also provided with a hydraulic ring groove (231). When the hydraulic ring groove (231) is opposite to the through hole (621), the pressure transmission fluid enters the hydraulic ring groove (231) through the through hole (621).

5. The valve assist device (1) according to claim 4, characterized in that, The second cavity (21) includes a first section (211) and a second section (212) along its axial direction. The inner diameter of the first section (211) is smaller than that of the second section (212). The first piston (23) abuts against the inner wall of the first section (211), and there is a gap between the first piston (23) and the inner wall of the second section (212). The first piston (23) is configured to squeeze the pressure transmission fluid in the hydraulic ring groove (231) into the second section (212) when moving from the first section (211) to the second section (212).

6. The valve boosting device (1) according to any one of claims 1-5, characterized in that, A flow passage (25) is provided between the second cavity (21) and the third cavity (22), and a check valve (26) is arranged in the flow passage (25).

7. The valve assist device (1) according to claim 6, characterized in that, The check valve (26) includes a mounting groove (261), a limiting groove (262) and a check valve ball (263). The check valve ball (263) is arranged in the mounting groove (261), and the limiting groove (262) is arranged at one end of the mounting groove (261) close to the third cavity (22). The limiting groove (262) is used to limit the movement range of the check valve ball (263).

8. The valve boosting device (1) according to claim 7, characterized in that, A first return hole (221) is arranged on the third cavity (22), and the third cavity (22) is connected to the first cavity (30) through the first return hole (221). The oil storage cylinder (10) further includes a through hole (13) and a plug (14). The through hole (13) penetrates the oil storage cylinder (10) and corresponds to the first return hole (221). The plug (14) is configured to block the through hole (13) and the first return hole (221) when the first piston (23) moves towards the third cavity (22), and conduct the first return hole (221) when the first piston (23) moves away from the third cavity (22).

9. The valve assist device (1) according to claim 8, characterized in that, A second return hole (222) is further arranged on the third cavity (22). The first return hole (221) and the second return hole (222) are distributed along the axial direction of the third cavity (22). The first return hole (221) is located between the flow passage (25) and the second return hole (222). The second piston (24) is adapted to move between the first return hole (221) and the second return hole (222).

10. The valve assist device (1) according to any one of claims 1-5, characterized in that, The oil storage cylinder (10) further includes an oil storage cylinder body (11) and an oil storage cylinder cover (12). The oil storage cylinder cover (12) is hermetically connected to the oil storage cylinder body (11) through a fastener.

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