CN109505560B

CN109505560B - Throttle constant pressure valve

Info

Publication number: CN109505560B
Application number: CN201710827352.8A
Authority: CN
Inventors: 韩光耀; 谢斌; 刘锦天; 许珂
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2017-09-14
Filing date: 2017-09-14
Publication date: 2021-09-28
Anticipated expiration: 2037-09-14
Also published as: CN109505560A

Abstract

The invention provides a throttling constant pressure valve. The throttle constant pressure valve includes: a valve body having a receiving cavity; the joint is arranged at the first end of the valve body and used for plugging the first end of the valve body; the throttling assembly is arranged in the accommodating cavity, the throttling assembly is provided with an inner cavity communicated with the accommodating cavity, the throttling assembly divides the accommodating cavity into a first cavity and a second cavity, the inner cavity is communicated with the first cavity, the throttling assembly is provided with a communicating state and a pressure maintaining state, when the throttling assembly is in the communicating state, the first cavity is communicated with the second cavity, and when the throttling assembly is in the pressure maintaining state, the first cavity is communicated with the second cavity in a disconnecting mode so as to maintain the pressure in the second cavity. The invention effectively solves the problem of large energy consumption when the throttling constant pressure valve needs to maintain pressure in the prior art.

Description

Throttle constant pressure valve

Technical Field

The invention relates to the technical field of oil field downhole operation, in particular to a throttling constant pressure valve.

Background

The throttling constant pressure valve is a common tool for oil field downhole operation and is generally used for providing pressure in a workover string. The throttling constant pressure valve is generally in a bell-mouth structure, and when fluid provided by a pump truck passes through the bell-mouth structure at a certain displacement, a throttling effect is formed, pressure is formed in a pipe column, and the pressure can be used for setting a packer or opening a tool.

However, the throttling constant pressure valve usually needs the pump truck to provide a certain displacement to form effective throttling pressure, once the pump truck stops working, the pressure in the throttling constant pressure valve disappears immediately, if the pressure in the throttling constant pressure valve needs to be continuously existed, the pump truck needs to be always in a running state, so that the energy consumption of downhole operation is large, and the energy waste is caused.

Disclosure of Invention

The invention mainly aims to provide a throttling constant pressure valve to solve the problem of high energy consumption when the throttling constant pressure valve needs to maintain pressure in the prior art.

In order to achieve the above object, the present invention provides a throttle constant pressure valve, comprising: a valve body having a receiving cavity; the joint is arranged at the first end of the valve body and used for plugging the first end of the valve body; the throttling assembly is arranged in the accommodating cavity, the throttling assembly is provided with an inner cavity communicated with the accommodating cavity, the throttling assembly divides the accommodating cavity into a first cavity and a second cavity, the inner cavity is communicated with the first cavity, the throttling assembly is provided with a communicating state and a pressure maintaining state, when the throttling assembly is in the communicating state, the first cavity is communicated with the second cavity, and when the throttling assembly is in the pressure maintaining state, the first cavity is communicated with the second cavity in a disconnecting mode so as to maintain the pressure in the second cavity.

Furthermore, a first communicating hole is formed in the side wall of the valve body, the first end of the joint extends into the valve body, a second communicating hole is formed in the side wall of the joint and is communicated with the first communicating hole, when the throttling assembly is in a communicated state, the inner cavity is completely or partially communicated with the second communicating hole, and when the throttling assembly is in a pressure maintaining state, the inner cavity is disconnected and communicated with the second communicating hole.

Further, a throttle assembly is slidably disposed within the receiving chamber, the throttle assembly comprising: the central tube is arranged in the accommodating cavity, a third through hole is formed in the tube wall of the central tube, when the throttling assembly is in a communicating state, the third through hole is completely or partially communicated with the second through hole, and when the throttling assembly is in a pressure maintaining state, the third through hole is disconnected and communicated with the second through hole.

Further, the throttle assembly further comprises: and the throttling component is arranged at one end of the central pipe, which is far away from the joint, is in a communication state when the flow rate of the fluid flowing through the throttling component is less than or equal to a preset value, and is in a pressure maintaining state when the flow rate of the fluid flowing through the throttling component is greater than or equal to the preset value.

Further, the throttling element is of a horn-shaped structure, and the flaring of the horn-shaped structure faces to the side far away from the joint.

Further, the joint further comprises: the first step surface is arranged on the inner wall of the joint, and the throttling assembly can be matched with the first step surface in a stopping mode in the sliding process of the throttling assembly.

Further, the throttle constant pressure valve further comprises: the inner wall of the joint is provided with a containing groove for containing the first sealing structure, and the third through hole is positioned on one side, close to the joint, of the first sealing structure when the first step surface is matched with the stop of the central pipe.

Further, the valve body still includes: and the second step surface is arranged on the pipe wall of the valve body so as to limit the throttling assembly in the accommodating cavity.

Further, the third through hole is completely communicated with the second communication hole when the second step surface is in stop fit with the throttling assembly.

Further, the throttle constant pressure valve further comprises: and the second sealing structure is sleeved on the central pipe and is arranged close to the second step surface.

Further, the number of the second sealing structures is one or more, and when the number of the second sealing structures is plural, the plural second sealing structures are arranged at intervals along the axial direction of the center pipe.

Further, the center tube includes: the body part is provided with the third through hole and can be matched with the first step surface in a stop way; the stopping part is provided with a step ring groove, the throttling element is arranged in the step ring groove and is in threaded connection with the stopping part, and the stopping part can be matched with the second step surface in a stopping way.

Further, the throttle constant pressure valve further comprises: the piece that resets sets up in the second cavity, and the one end butt of the piece that resets on the center tube, and the other end butt of the piece that resets is on the joint, and the piece that resets is used for providing the reset power to keeping away from joint one side motion for the center tube.

By applying the technical scheme of the invention, the throttling constant pressure valve comprises a valve body, a joint and a throttling component. Wherein the valve body has an accommodation chamber. The joint is arranged at the first end of the valve body and used for plugging the first end of the valve body. The throttling assembly is arranged in the accommodating cavity, the throttling assembly is provided with an inner cavity communicated with the accommodating cavity, the throttling assembly divides the accommodating cavity into a first cavity and a second cavity, the inner cavity is communicated with the first cavity, the throttling assembly is provided with a communicating state and a pressure maintaining state, when the throttling assembly is in the communicating state, the first cavity is communicated with the second cavity, and when the throttling assembly is in the pressure maintaining state, the first cavity is communicated with the second cavity in a disconnecting mode so as to maintain the pressure in the second cavity.

In this way, the power equipment transmits fluid to the accommodating cavity of the throttling constant pressure valve, and the throttling component in the accommodating cavity can be switched between a communication state and a pressure maintaining state under the condition of different flow rates of the power equipment. When the throttle constant pressure valve is in the pressurize state, the pressure in the second chamber remains unchanged, then the pipeline internal pressure that communicates with the second chamber is unchanged, and need not continuously provide flow in order to keep the pressure in the throttle constant pressure valve to the throttle constant pressure valve, and then need not continuously work to the power equipment that the throttle constant pressure valve provided flow, and then reduce operating system's whole energy consumption, the energy saving.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a cross-sectional view of an embodiment of a throttling pressure-equalizing valve according to the present invention.

Wherein the figures include the following reference numerals:

10. a valve body; 11. an accommodating chamber; 111. a first chamber; 112. a second chamber; 12. a first communication hole; 13. a second step surface; 20. a joint; 21. a second communication hole; 22. a first step surface; 31. a central tube; 311. a third through hole; 312. a body portion; 313. a stopper portion; 32. a throttle member; 33. an inner cavity; 41. a first seal structure; 42. a second seal structure; 50. a reset member.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless stated to the contrary, use of the directional terms "upper and lower" are generally directed to the orientation shown in the drawings, or to the vertical, or gravitational direction; likewise, for ease of understanding and description, "left and right" are generally to the left and right as shown in the drawings; "inner and outer" refer to the inner and outer relative to the profile of the respective member itself, but the above directional terms are not intended to limit the present invention.

In order to solve the problem that the energy consumption is large when the throttling constant pressure valve needs to maintain the pressure in the prior art, the application provides the throttling constant pressure valve.

As shown in fig. 1, the throttle constant pressure valve of the present embodiment includes a valve body 10, a joint 20, and a throttle assembly. Wherein the valve body 10 has a receiving chamber 11. The fitting 20 is disposed at a first end of the valve body 10 and is configured to close off the first end of the valve body 10. The throttling assembly is arranged in the accommodating cavity 11, the throttling assembly is provided with an inner cavity 33 communicated with the accommodating cavity 11, the accommodating cavity 11 is divided into a first cavity 111 and a second cavity 112 by the throttling assembly, the inner cavity 33 is communicated with the first cavity 111, the throttling assembly is provided with a communicating state and a pressure maintaining state, when the throttling assembly is in the communicating state, the first cavity 111 is communicated with the second cavity 112, and when the throttling assembly is in the pressure maintaining state, the first cavity 111 is disconnected from the second cavity 112 so as to maintain the pressure in the second cavity 112.

The power equipment transmits fluid to the accommodating cavity 11 of the throttling constant pressure valve, and the throttling component in the accommodating cavity 11 can be switched between a communication state and a pressure maintaining state under the condition of different flow rates of the power equipment. When the throttle constant pressure valve is in the pressurize state, the pressure in the second chamber 112 remains unchanged, then the pipeline internal pressure that communicates with the second chamber 112 is unchanged, and need not continuously provide flow in order to keep the pressure in the throttle constant pressure valve to the throttle constant pressure valve, and then need not continuously work to the power equipment that the throttle constant pressure valve provided flow, and then reduce operating system's whole energy consumption, the energy saving.

In this embodiment, the power plant is a pump body structure. Fluid is pumped into the pipeline through the pump body structure through the throttling constant pressure valve.

Optionally, the valve body 10 is threadedly connected to the adapter 20. The threaded connection enables the installation or the disassembly of the two to be easier, and further reduces the labor intensity of workers.

As shown in fig. 1, a first communication hole 12 is formed in a sidewall of the valve body 10, a first end of the joint 20 extends into the valve body 10, a second communication hole 21 is formed in a sidewall of the joint 20, and the second communication hole 21 communicates with the first communication hole 12, such that the inner chamber 33 is completely or partially communicated with the second communication hole 21 when the throttle assembly is in a communicating state, and the inner chamber 33 is disconnected from the second communication hole 21 when the throttle assembly is in a pressure maintaining state. Thus, when the throttling assembly is in the communicating state, the fluid in the inner cavity 33 can enter the second chamber 112 through the second communicating hole 21 and pass out of the first communicating hole 12 to enter the pipeline communicated with the valve body 10, and then the transmission of the fluid is realized. The structure is simple and easy to process.

Specifically, the side wall of the part of the joint 20 extending into the valve body 10 is provided with a second communication hole 21 communicating with the first communication hole 12. When liquid pumped by the pump body structure enters the accommodating cavity 11 and the inner cavity 33, the throttling assembly is in a communicated state, and the liquid in the inner cavity 33 and the accommodating cavity 11 can enter the second chamber 112 through the second communication hole 21 and enter a pipeline communicated with the valve body 10 through the first communication hole 12. Along with the increase of the pumping flow, the pressure value generated on the throttling component continuously increases, when the pressure value reaches a preset value, the throttling component is switched to a pressure maintaining state, at the moment, the inner cavity 33 is disconnected from the second communication hole 21, the liquid flow in the second chamber 112 is not changed, the pressure in the second chamber 112 is kept unchanged, and the throttling constant pressure valve plays a pressure maintaining role. Therefore, the pump body structure does not need to pump liquid to the throttling constant pressure valve, and the pump body structure does not need to operate, so that the energy consumption of the system is reduced, and the energy is saved.

As shown in fig. 1, a throttle assembly is slidably disposed in the accommodating chamber 11, and the throttle assembly includes a center tube 31. The central tube 31 is disposed in the accommodating chamber 11, a third through hole 311 is disposed on a tube wall of the central tube 31, when the throttling assembly is in a communicating state, the third through hole 311 is completely or partially communicated with the second through hole 21, and when the throttling assembly is in a pressure maintaining state, the third through hole 311 is disconnected from the second through hole 21. Therefore, the switching of the working state of the throttling component is realized by controlling the on-off state of the third through hole 311 and the second through hole 21, so that the throttling component is easier and simpler to operate by workers, and the labor intensity of the workers is further reduced.

Specifically, the central tube 31 extends into the joint 20, so that the third through hole 311 on the wall of the central tube 31 is located inside the second communication hole 21, and thus, the worker can switch the on-off state of the third through hole 311 and the second communication hole 21 by adjusting the depth of the central tube 31 extending into the joint 20. The structure is simple and easy to assemble.

As shown in fig. 1, the throttle assembly further includes a throttle 32. Wherein, a throttling element 32 is arranged at one end of the central tube 31 far away from the joint 20, when the flow rate of the liquid flowing through the throttling element 32 is less than or equal to a preset value, the throttling element is in a communication state, and when the flow rate of the liquid flowing through the throttling element 32 is greater than or equal to the preset value, the throttling element is in a pressure maintaining state. Different pressures are generated on the orifice 32 due to different flow rates of the liquid flowing through the orifice, and the pressures can act on the center pipe 31 to move the center pipe 31 in the axial direction thereof, thereby switching the communication state between the third communication hole 311 and the second communication hole 21.

Specifically, the liquid flowing through the orifice 32 can generate a certain pressure on the orifice 32, the pressure is transmitted to the center pipe 31 through the orifice 32, and the center pipe 31 is moved in the axial direction thereof, and then the third communication hole 311 moves together with the center pipe 31, that is, the third communication hole 311 moves relative to the second communication hole 21, and thus switching of the communication state of the third communication hole 311 and the second communication hole 21 is achieved. When the flow rate of the liquid flowing through the orifice 32 is less than or equal to a predetermined value, the pressure generated on the orifice 32 is insufficient to displace the center pipe 31, and the relative positions of the third communication hole 311 and the second communication hole 21 are not changed, and the throttle constant pressure valve is still in a communication state. Along with the increase of the liquid flow, when the flow rate of the liquid flowing through the throttling element 32 is larger than or equal to a preset value, the central pipe 31 is displaced, the relative position of the third through hole 311 and the second through hole 21 is changed, when the central pipe 31 moves to the state that the third through hole 311 is disconnected from the second through hole 21, the throttling constant pressure valve is in a pressure maintaining state, at the moment, the throttling constant pressure valve is closed, the liquid pressure in the first chamber 111 is not changed, the pressure in the second chamber 112 is kept unchanged, and the pump body structure is not required to continue to operate. When the throttling constant pressure valve is required to be decompressed, the throttling constant pressure valve is opened, so that the third through hole 311 is communicated with the second communication hole 21 again, and the throttling constant pressure valve is in a communicated state again.

As shown in fig. 1, the orifice 32 has a trumpet-like structure, and the flaring of the trumpet-like structure faces away from the joint 20. In this way, in the process of the liquid flowing through the throttling element 32, pressure is generated in the necking section of the trumpet-shaped structure, the pressure acts on the central pipe 31, and then the movement of the central pipe 31 is realized, so that the throttling constant pressure valve can be switched between the communication state and the pressure maintaining state. In addition, the structure is simple and easy to process.

As shown in fig. 1, the fitting 20 also includes a first step surface 22. Wherein the first step surface 22 is arranged on the inner wall of the joint 20, and the throttling component can be in stop fit with the first step surface 22 in the sliding process of the throttling component. Thus, the first step surface 22 serves to limit the movement of the center pipe 31. The limiting structure is simple in structure and easy to process.

Specifically, in the process that the central tube 31 moves towards the joint 20 along the axial direction thereof, the central tube 31 moves to be disconnected from the third communication hole 311 and the second communication hole 21 and then continues to move due to the action of the liquid pressure until the central tube 31 is in stop fit with the first step surface 22, so that the position of the central tube 31 in the accommodating cavity 11 is not changed any more, the liquid pressure in the second chamber 112 is not changed any more, and the throttling constant pressure valve is in a pressure maintaining state.

As shown in fig. 1, the throttle constant pressure valve further includes a first seal structure 41. Wherein, the inner wall of the joint 20 is provided with a receiving groove for receiving the first sealing structure 41, and the third through hole 311 is located on the side of the first sealing structure 41 close to the joint 20 when the first step surface 22 is in stop fit with the central tube 31. Like this, the throttle constant pressure valve adopts side seal, utilizes the mode realization of third through-hole 311 business turn over first seal structure 41 on the joint 20 to seal, communicate for form the slip seal face between joint 20 and the center tube 31, and then make the seal of throttle constant pressure valve or communicate more portably, easily.

Specifically, when the first step surface 22 is in stop engagement with the center tube 31, the third through hole 311 is located on the side of the first seal structure 41 close to the joint 20. Above-mentioned setting can guarantee that third feed opening 311 and second feed opening 21 break off the intercommunication completely when the throttle constant pressure valve is in the pressurize state, can not have liquid rethread second feed opening 21 and get into in the second chamber 112, and then improve the pressurize effect of throttle constant pressure valve.

Alternatively, the number of the first seal structures 41 is one or more, and when the number of the first seal structures 41 is plural, the plural first seal structures 41 are provided at intervals in the axial direction of the joint 20. As shown in fig. 1, the number of the first seal structures 41 is two, and the two first seal structures 41 are provided at intervals in the axial direction of the joint 20. Above-mentioned setting can improve first seal structure 41's sealed effect, and then the pressurize effect of reinforcing throttle constant pressure valve, then the pump body structure can be closed when throttle constant pressure valve is in the pressurize state, reduces the energy consumption, improves energy utilization.

Optionally, the first sealing structure 41 is a sealing packing. The sealing packing has the characteristics of high temperature resistance, stable sealing performance, high reliability, convenience in use and installation and the like, so that the throttling constant pressure valve is better in pressure maintaining performance and higher in reliability.

As shown in fig. 1, the valve body 10 further includes a second step surface 13. Wherein the second step surface 13 is provided on the pipe wall of the valve body 10 to restrain the throttle assembly within the accommodating chamber 11. Thus, the second step surface 13 serves to limit the movement of the center pipe 31. The limiting structure is simple in structure and easy to process.

Specifically, when the throttle constant pressure valve does not need the pressurize, when needing to carry out the pressure release promptly, open the throttle constant pressure valve, then center tube 31 moves in the direction of keeping away from joint 20 along its axis direction orientation for third through-hole 311 communicates with second intercommunicating pore 21 once more, and until center tube 31 and second step face 13 backstop cooperation, third through-hole 311 communicates with second intercommunicating pore 21 completely this moment, and then the position of center tube 31 in holding chamber 11 no longer changes, and the throttle constant pressure valve is in the connected state.

As shown in fig. 1, the throttle pressure regulator valve further includes a second seal structure 42. The second sealing structure 42 is sleeved on the central tube 31 and is disposed close to the second step surface 13. In this way, the second sealing structure 42 is arranged to enable the second chamber 112 to be in a completely sealed state when the throttling assembly is in the pressure maintaining state, so that the pressure maintaining effect of the throttling constant pressure valve is improved.

Optionally, the second seal 42 is a seal packing. The sealing packing has the characteristics of high temperature resistance, stable sealing performance, high reliability, convenience in use and installation and the like, so that the throttling constant pressure valve is better in pressure maintaining performance and higher in reliability.

Alternatively, the number of the second seal structures 42 is one or more, and when the number of the second seal structures 42 is plural, the plural second seal structures 42 are provided at intervals in the axial direction of the center pipe 31. As shown in fig. 1, the number of the second seal structures 42 is two, and the two second seal structures 42 are provided at intervals in the axial direction of the center pipe 31. Above-mentioned setting can improve the sealed effect of second seal structure 42, and then the pressurize effect of reinforcing throttle constant pressure valve, then the pump body structure can be closed when throttle constant pressure valve is in the pressurize state, reduces the energy consumption, improves energy utilization.

As shown in fig. 1, the center tube 31 includes a body 312 and a stopper 313. The third through hole 311 is disposed on the body 312, and the body 312 can be in stop fit with the first step surface 22. The stopping portion 313 has a step ring groove, the throttling element 32 is disposed in the step ring groove and is in threaded connection with the stopping portion 313, and the stopping portion 313 can be in stopping fit with the second step surface 13. The structure is simple, and the processing and the assembly are easy. In addition, the threaded connection is simple, so that the throttling element 32 and the central tube 31 can be assembled or disassembled more conveniently, and the labor intensity of workers is reduced.

As shown in fig. 1, the throttle pressure regulator valve further includes a reset member 50. Wherein the restoring element 50 is disposed in the second chamber 112, and one end of the restoring element 50 abuts on the central tube 31, and the other end of the restoring element 50 abuts on the joint 20, the restoring element 50 is used for providing restoring force to the central tube 31, and the restoring force moves to the side far away from the joint 20. Thus, the above-described arrangement of the returning member 50 makes it easier and quicker to return the throttle constant pressure valve to the communicating state again.

Optionally, the return member 50 is a spring. The spring is the standard component, can reduce the processing cost of throttle constant pressure valve.

In this application, the specific working process of the throttling constant pressure valve is as follows:

when liquid pumped by the pump body structure enters the inner cavity 33, the throttling assembly is in a communication state, the third through hole 311 on the central pipe 31 is communicated with the second communication hole 21 on the joint 20, and the liquid in the inner cavity 33 can pass through the third through hole 311, enter the second chamber 112 through the second communication hole 21 and then enter a pipeline communicated with the valve body 10 through the first communication hole 12. When liquid passes through the throttling element 32 at a certain displacement, throttling pressure difference is formed due to the fact that the cross section of the throttling element 32 is reduced, the pressure difference acts on the central pipe 31 to push the central pipe 31 to move towards the joint 20 in the axial direction of the central pipe 31, the throttling pressure difference generated on the throttling element 32 is continuously increased along with the increase of the pumping flow, the acting force applied on the central pipe 31 is also continuously increased, meanwhile, the resetting element 50 is compressed, and elastic potential energy is stored on the resetting element 50. As long as the liquid flow rate does not reach the predetermined value, the third through hole 311 of the center pipe 31 does not move to the first seal structure 41 of the joint 20, and the third through hole 311 is kept in communication with the second communication hole 21.

When the pressure value reaches a predetermined value, namely after the third through hole 311 is disconnected from the second communicating hole 21, the central tube 31 continues to move towards the joint 20 under the action of liquid pressure until the central tube 31 is matched with the first step surface 22 on the joint 20 in a stop manner, at the moment, the third through hole 311 is completely disconnected from the second communicating hole 21, the second chamber 112 is a dead space, the pressure in a pipeline communicated with the second chamber 112 does not change any more, the throttling constant pressure valve is in a pressure maintaining state, and a worker can close the pump body structure to reduce energy consumption and save energy. Meanwhile, the staff closes the throttling constant pressure valve.

When the staff need carry out the pressure release to the throttle constant pressure valve, open pump body structure simultaneously, then center tube 31 moves towards the direction of keeping away from joint 20 under the reset force effect of piece 50 that resets for distance between third through-hole 311 and the second intercommunicating pore 21 constantly shortens, until the cooperation of the second step face 13 backstop on center tube 31 and the valve body 10, third through-hole 311 communicates with second intercommunicating pore 21 completely this moment, then the throttle constant pressure valve is in the connected state once more, can normal operating.

In this embodiment, the throttling constant pressure valve does not adopt a ball or check valve to hold pressure, so that the circulation mode of the liquid is not affected, and any positive and negative circulation can be realized. Wherein, the liquid flows into the containing cavity 11, and the direction of the liquid flowing through the first communication hole 12 and entering other pipelines is the positive circulation direction; the liquid enters the containing cavity 11 from other pipelines through the first communication hole 12, and the direction of the liquid flowing out from the containing cavity 11 is the reverse circulation direction.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

power equipment is to the intracavity transmission liquid that holds of throttle constant pressure valve, and under the condition of power equipment's different flow, the throttle subassembly that holds the intracavity can switch between the state of intercommunication and pressurize state. When the throttle constant pressure valve is in the pressurize state, the pressure in the second chamber remains unchanged, then the pipeline internal pressure that communicates with the second chamber is unchanged, and need not continuously provide flow in order to keep the pressure in the throttle constant pressure valve to the throttle constant pressure valve, and then need not continuously work to the power equipment that the throttle constant pressure valve provided flow, and then reduce operating system's whole energy consumption, the energy saving.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A throttling pressure-sustaining valve, comprising:

a valve body (10) having a housing chamber (11);

the joint (20) is arranged at the first end of the valve body (10) and is used for sealing the first end of the valve body (10);

a throttle assembly provided in the accommodating chamber (11), the throttle assembly having an inner chamber (33) communicating with the accommodating chamber (11), and the throttle assembly dividing the accommodating chamber (11) into a first chamber (111) and a second chamber (112), the inner chamber (33) communicating with the first chamber (111), the throttle assembly having a communicating state in which the first chamber (111) communicates with the second chamber (112) and a pressure holding state in which the first chamber (111) is disconnected from the second chamber (112) to hold a pressure in the second chamber (112);

a first communication hole (12) is formed in the side wall of the valve body (10), a second communication hole (21) is formed in the side wall of the joint (20), and the second communication hole (21) is communicated with the first communication hole (12); the throttle assembly is slidably disposed within the receiving chamber (11), the throttle assembly comprising:

the central tube (31) is arranged in the accommodating cavity (11), a third through hole (311) is formed in the tube wall of the central tube (31), when the throttling assembly is in the communication state, the third through hole (311) is completely or partially communicated with the second communication hole (21), and when the throttling assembly is in the pressure maintaining state, the third through hole (311) is disconnected and communicated with the second communication hole (21).

2. The throttle constant pressure valve according to claim 1, characterized in that a first end of the joint (20) protrudes into the valve body (10), the inner chamber (33) is completely or partially communicated with the second communication hole (21) when the throttle assembly is in the communication state, and the inner chamber (33) is disconnected from the second communication hole (21) when the throttle assembly is in the pressure holding state.

3. The throttle pressure valve according to claim 1, wherein the throttle assembly further comprises:

a throttle member (32) provided on an end of the center pipe (31) remote from the joint (20), the throttle member being in the communicating state when a flow rate of the fluid flowing through the throttle member (32) is less than or equal to a predetermined value, the throttle member being in the pressure holding state when the flow rate of the fluid flowing through the throttle member (32) is greater than the predetermined value.

4. A throttling pressure-equalizing valve according to claim 3, characterized in that the throttling element (32) is of a trumpet-like structure, and the flaring of the trumpet-like structure is directed towards the side remote from the fitting (20).

5. A throttling pressure-equalizing valve according to claim 3, characterized in that said joint (20) further comprises:

the first step surface (22) is arranged on the inner wall of the joint (20), and the throttling assembly can be matched with the first step surface (22) in a stopping mode in the sliding process of the throttling assembly.

6. The throttling pressure-stabilizing valve according to claim 5, further comprising:

the inner wall of the joint (20) is provided with a containing groove for containing the first sealing structure (41), and when the first step surface (22) is matched with the stop of the central pipe (31), the third through hole (311) is positioned on one side, close to the joint (20), of the first sealing structure (41).

7. A throttling pressure-equalizing valve according to claim 5, characterized in that said valve body (10) further comprises:

and the second step surface (13) is arranged on the pipe wall of the valve body (10) to limit the throttling assembly in the accommodating cavity (11).

8. A throttling pressure-stabilizing valve according to claim 7, characterized in that said third through hole (311) is fully communicated with said second communication hole (21) when said second step face (13) is fitted with said throttling assembly stopper.

9. The throttling pressure-stabilizing valve according to claim 7, further comprising:

and the second sealing structure (42) is sleeved on the central pipe (31) and is close to the second step surface (13).

10. A throttling and pressure-equalizing valve according to claim 9, characterized in that the number of the second sealing structures (42) is one or more, and when the number of the second sealing structures (42) is plural, the plural second sealing structures (42) are arranged at intervals in the axial direction of the center pipe (31).

11. A throttling pressure-equalizing valve according to claim 7, characterized in that said central tube (31) comprises:

the body part (312), the third through hole (311) is arranged on the body part (312), and the body part (312) can be in stop fit with the first step surface (22);

the stopping part (313) is provided with a step ring groove, the throttling piece (32) is arranged in the step ring groove and is in threaded connection with the stopping part (313), and the stopping part (313) can be matched with the second step surface (13) in a stopping way.

12. The throttle pressure valve according to claim 1, further comprising:

the resetting piece (50) is arranged in the second chamber (112), one end of the resetting piece (50) abuts against the central tube (31), the other end of the resetting piece (50) abuts against the joint (20), and the resetting piece (50) is used for providing resetting force for the central tube (31) to move to the side far away from the joint (20).