CN213839571U

CN213839571U - Differential pressure regulating valve

Info

Publication number: CN213839571U
Application number: CN202022997041.6U
Authority: CN
Inventors: 李永达; 石良; 丁焕钦
Original assignee: Zhejiang Liyongda Refrigeration Machinery Co ltd
Current assignee: Zhejiang Liyongda Refrigeration Machinery Co ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-07-30
Anticipated expiration: 2030-12-11

Abstract

The utility model provides a pressure difference regulating valve relates to pump valve technical field among the refrigerating system, has solved the technical problem of the function that the pressure regulating valve that exists does not adjust the inlet outlet pressure differential among the prior art. The device comprises a valve body, a valve core, a piston, an adjusting device, a communicating piece and a pressure guide pipe, wherein the inside of the valve body is divided into an inlet cavity and an outlet cavity by a partition plate, and the piston can push the valve core and separate the valve core from a through hole; the diaphragm is arranged between the adjusting device and the communicating piece, the communicating piece is provided with a communicating cavity, when the pressure difference adjusting valve is in a valve opening state, the pressure of a medium in the inlet cavity to the diaphragm is larger than the pressure of the adjusting device to the diaphragm, the medium in the communicating cavity can enter the outlet cavity and can push the piston to move so as to separate the valve core from the through hole, the medium in the inlet cavity flows into the outlet cavity through a gap between the valve core and the through hole, part of the medium in the outlet cavity enters the adjusting device through the pressure guide pipe, and the pressure of the adjusting device to the diaphragm is increased.

Description

Differential pressure regulating valve

Technical Field

The utility model belongs to the technical field of pump valve technique among the refrigerating system and specifically relates to a pressure differential regulating valve is related to.

Background

The pressure regulating valve is also called self-operated balance valve, flow control valve, flow controller, dynamic balance valve and flow balance valve, and is a visual, simple and convenient flow regulating and controlling device. The flow can be directly set according to the design by applying the pressure regulating valve in the pipe network, the valve can automatically eliminate the residual pressure head of the pipeline and the flow deviation caused by pressure fluctuation under the action of water, the set flow is kept unchanged no matter how the system pressure changes, the functions of the valve enable the pipe network flow regulation to be completed at one time, the net regulation work is changed into simple flow distribution, and the hydraulic imbalance of the pipe network is effectively solved.

In the prior art, a spring arranged in a regulating device is used for counteracting the acting force of high-pressure liquid on a valve core in the regulating process of the pressure regulating valve and pushing the valve core to block a water inlet passage. In some pipelines, the pressure of a water outlet in a pressure regulating valve needs to be smaller than the pressure of a water inlet to meet the requirement of the pipelines, and at present, the existing pressure regulating valve does not have the function of regulating the pressure difference of the water inlet and the water outlet.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pressure differential regulating valve to the pressure regulating valve who exists does not have the technical problem who adjusts the function of inlet outlet pressure difference among the solution prior art. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a differential pressure regulating valve, including valve body, case, piston, adjusting device, intercommunication piece and connecting pipe, wherein, be provided with the division board in the valve body, the division board divide into inlet chamber and outlet chamber the valve body inside, be provided with the through-hole on the division board, inlet chamber and outlet chamber are linked together through the through-hole;

the valve core is connected with one end of the piston, the other end of the piston is in sealing contact with the inner wall of the outlet cavity, the piston can move on the inner wall of the outlet cavity, the valve core can block the through hole, and the piston can push the valve core and separate the valve core from the through hole;

the valve body is connected with the communicating piece in a sealing mode, the adjusting device is connected with the communicating piece in a sealing mode, a membrane is arranged between the adjusting device and the communicating piece, a communicating cavity is formed in the communicating piece, one end of the communicating cavity is communicated with the outlet cavity, the other end of the communicating cavity is communicated with the inlet cavity through a conduit, and the communicating cavity can be blocked by the membrane;

the outlet cavity is communicated with the adjusting device through the pressure guide pipe, and part of the medium in the outlet cavity enters the adjusting device through the pressure guide pipe and can apply pressure to the diaphragm;

the pressure difference regulating valve has an open valve state and a closed valve state, when the pressure difference regulating valve is in the open valve state, the pressure of a medium in the inlet cavity to the diaphragm is larger than the pressure of the regulating device to the diaphragm, part of the medium in the inlet cavity enters the communicating cavity through the guide pipe and can push the diaphragm to enable the communicating cavity to be communicated, the medium in the communicating cavity can enter the outlet cavity and can push the piston to move to enable the valve core and the through hole to be separated, the medium in the inlet cavity flows into the outlet cavity through a gap between the valve core and the through hole, and part of the medium in the outlet cavity enters the regulating device through the pressure guide pipe to increase the pressure of the regulating device to the diaphragm.

Optionally, adjusting device includes upper bonnet, elastic component, pressure adjustment spare and last bonnet, upper bonnet with a intercommunication sealing connection, upper bonnet with the export chamber passes through the connecting pipe is linked together, the elastic component is located in the upper bonnet just the one end butt of elastic component is in on the diaphragm, the other end of elastic component with pressure adjustment spare is connected just the pressure adjustment spare can be adjusted the elastic component is used in elastic force on the diaphragm, the free end of pressure adjustment spare can stretch out upper bonnet, upper bonnet with upper bonnet threaded connection just the upper bonnet can cover the free end of pressure adjustment spare.

Optionally, the elastic element includes an adjusting spring, a lower spring seat, an upper spring seat, a steel ball and a slider, the upper end of the adjusting spring is connected to the upper spring seat, the lower end of the adjusting spring is connected to the lower spring seat, the steel ball is located between the slider and the lower spring seat, and the slider abuts against the diaphragm.

Optionally, the pressure adjusting part includes pressure adjusting rod, first bolt and first gasket, first bolt with first gasket is all inlayed in the upper valve lid, the pressure adjusting rod passes in proper order first bolt with first gasket and with the elastic component is connected, the pressure adjusting rod with first bolt threaded connection.

Optionally, still include the needle valve, the needle valve is located the side of connecting piece, the one end of needle valve can insert in the connecting piece just the needle valve with the intercommunication chamber is linked together, the needle valve can be connected with measuring device.

Optionally, the piston comprises a piston rod and a piston block, the piston rod is fixedly connected with the piston block, the free end of the piston rod is connected with the valve core, the piston block is in sealing contact with the inner wall of the outlet cavity, and the cross-sectional area of the piston block is larger than that of the piston rod;

the piston block is provided with a pressure relief hole.

Optionally, the valve further comprises a manual valve opening device, the manual valve opening device is connected with the valve body in a sealing mode, the manual valve opening device is connected with the valve core, and the valve core can be pulled to be separated from the through hole by the manual valve opening device.

Optionally, the manual valve opening device includes a lower valve cap, a manual valve rod, a stop collar, a second bolt, a second gasket, and a lower valve cap, the lower valve cap is connected to the valve body in a sealing manner, the stop collar is embedded in the valve core, the second bolt and the second gasket are embedded in the lower valve cap, the stop collar is sleeved on one end of the manual valve rod and limits the manual valve rod to be detached from the stop collar, a free end of the manual valve rod passes through the second gasket, the second bolt and the lower valve cap, and a free end of the manual valve rod extends out of the lower valve cap, the manual valve rod is connected to the second bolt in a threaded manner, and the lower valve cap is connected to the lower valve cap in a threaded manner and can cover the free end of the manual valve rod.

Optionally, the valve element includes a positioning column, a connecting piece and a limiting plate, one side of the connecting piece is fixedly connected to the positioning column, the other side of the connecting piece is fixedly connected to the limiting plate, the limiting plates are distributed along a circumferential direction of the connecting piece, the piston abuts against the connecting piece, and the limiting plate and the piston are located on the same side of the connecting piece;

and the positioning column is internally provided with a mounting hole.

Optionally, the valve further comprises a seat returning spring, the seat returning spring is located in the inlet cavity, the seat returning spring is sleeved on the valve core, and the elastic force of the seat returning spring enables the valve core to move until the valve core blocks the through hole.

The utility model provides a pair of pressure difference regulating valve, exert certain pressure to the diaphragm earlier with adjusting device, the part medium in the oral cavity of entering enters into the intercommunication intracavity through the pipe, exert pressure to the diaphragm, when this pressure is greater than adjusting device to the pressure that the diaphragm was exerted, diaphragm shift position makes the intercommunication chamber switch on, can let the medium in the intercommunication intracavity enter into the pressure intracavity and remove the promotion piston, and then the piston promotes the case and removes, makes the case with the through-hole is separated, and pressure difference regulating valve just is in the open valve state, and then the medium in the oral cavity of entering can flow into the outlet chamber through the clearance between case and the through-hole, and the part medium in the oral cavity of going out can enter into adjusting device through the pressure pipe simultaneously, increases the pressure to the diaphragm, and the pressure of the remaining medium in the outlet chamber can be less than the pressure of the medium in the oral cavity of entering, and then the inlet outlet that can form pressure regulating valve has the condition of pressure difference, the technical problem that a pressure regulating valve in the prior art does not have the function of regulating the pressure difference of a water inlet and a water outlet is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a sectional view of a differential pressure regulating valve according to an embodiment of the present invention;

fig. 2 is a front view of a differential pressure regulating valve provided in an embodiment of the present invention;

FIG. 1, valve body; 11. a partition plate; 12. an inlet chamber; 13. an outlet chamber; 14. a dust cover; 2. a valve core; 21. a positioning column; 211. mounting holes; 22. a connecting member; 23. a limiting plate; 3. a piston; 31. a piston rod; 32. a piston block; 321. a pressure relief vent; 4. an adjustment device; 41. an upper valve cover; 42. an elastic member; 421. adjusting the spring; 422. a lower spring seat; 423. an upper spring seat; 424. steel balls; 425. a slider; 43. a pressure regulating member; 431. a pressure regulating rod; 432. a first bolt; 433. a first gasket; 44. an upper bonnet; 5. a communicating member; 51. a communicating cavity; 6. a membrane; 7. a needle valve; 8. a manual valve opening device; 81. a lower valve cover; 82. a manual valve stem; 83. a limiting sleeve; 84. a second bolt; 85. a second gasket; 86. a lower bonnet; 9. a return spring; 10. a conduit; 20. a valve seat; 30. and a pressure guide pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like are used in an orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is also to be understood that the terms "mounted", "connected" and "connected", unless expressly specified or limited otherwise, are intended to be interpreted broadly, as meaning either a fixed connection or a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

The utility model provides a pressure difference regulating valve, including valve body 1, case 2, piston 3, adjusting device 4, communicating piece 5 and connecting pipe 30, wherein, be provided with division board 11 in the valve body 1, division board 11 is the bending structure, division board 11 divides into intake chamber 12 and outlet chamber 13 with the valve body 1 inside, be provided with the through-hole on division board 11, intake chamber 12 and outlet chamber 13 are linked together through the through-hole, intake chamber 12 can be linked together with the feed liquor pipeline, outlet chamber 13 can be linked together with the liquid outlet pipeline, the port of intake chamber 12 and outlet chamber 13 both adopts flange to add the cover structure to can cover with shield 14;

the valve core 2 is connected with one end of the piston 3, the other end of the piston 3 is in sealing contact with the inner wall of the outlet cavity 13, the piston 3 can move on the inner wall of the outlet cavity 13, the piston 3 is positioned in the position far away from the port in the outlet cavity 13, and simultaneously, the outlet cavity 13 is divided into two parts by the piston 3 in the moving process, namely a containing cavity and a pressure cavity, the containing cavity is directly communicated with the liquid outlet pipeline, the medium in the inlet cavity 12 directly enters the containing cavity through the through hole, the medium in the pressure cavity is used for providing piston pressure, further pushing the piston, the medium in the pressure chamber flows in from the communicating chamber 51, the containing chamber is communicated with the pressure chamber through the pressure relief hole 321, the valve core 2 can block the through hole, the piston 3 can push the valve core 2 and separate the valve core 2 from the through hole, the medium in the inlet cavity 12 can be enabled to flow into the outlet cavity 13 from the position where the valve core 2 is separated from the through hole;

the upper end of the valve body 1 is hermetically connected with a communicating piece 5, the adjusting device 4 is hermetically connected with the communicating piece 5, a membrane 6 is arranged between the adjusting device 4 and the communicating piece 5, the membrane 6 is made of stainless steel, a communicating cavity 51 is arranged inside the communicating piece 5, one end of the communicating cavity 51 is communicated with an outlet cavity 13, the other end of the communicating cavity 51 is communicated with an inlet cavity 12 through a conduit 10, the conduit 10 is positioned in the valve body 1, the communicating cavity 51 can be blocked by the membrane 6, the communicating cavity 51 is divided into a central communicating cavity and a lateral communicating cavity, the central communicating cavity is communicated with the outlet cavity 13, the lateral communicating cavity is communicated with the inlet cavity 12 through the conduit 10, the central communicating cavity is communicated with the lateral communicating cavity, the central communicating cavity can be blocked by the membrane 6, the central communicating cavity is not communicated with the lateral communicating cavity, the central communicating cavity is also provided with the valve seat 20, the valve seat 20 is of a hollow structure, and the valve seat 20 can be blocked by the membrane 6, the communication chamber 51 can be blocked;

the outlet cavity 13 is communicated with the adjusting device 4 through a pressure guide pipe 30, a first hole is formed in the containing cavity, a second hole is formed in the upper valve cover 41, joints are arranged on the first hole and the second hole, two ends of the pressure guide pipe 30 are respectively connected with the joints on the first hole and the second hole through nuts, part of the medium in the containing cavity enters the upper valve cover 41 through the pressure guide pipe 30 and can apply pressure to the diaphragm 6, so that the pressure of the medium in the containing cavity is reduced and is smaller than that of the medium in the inlet cavity 12, and the phenomena of large pressure in the liquid inlet pipeline and small pressure in the liquid outlet pipeline are formed;

when the differential pressure regulating valve is in the valve-opening state, the pressure of the medium in the inlet cavity 12 to the membrane 6 is greater than the pressure of the regulating device 4 to the membrane 6, so that the membrane 6 is far away from the end face of the valve seat 20, and further the communication cavity 51 is communicated, part of the medium in the inlet cavity 12 enters the communication cavity 51 through the conduit 10 and can push the membrane 6 to conduct the communication cavity 51, the medium in the communication cavity 51 can enter the outlet cavity 13 and can push the piston 3 to move so as to separate the valve core 2 from the through hole, the medium in the inlet cavity 12 flows into the outlet cavity 13 through a gap between the valve core 2 and the through hole, part of the medium in the outlet cavity 13 enters the regulating device 4 through the pressure guide pipe 30, the pressure of the regulating device 4 to the membrane 6 is increased, and further the pressure of the regulating spring 421 to the membrane 6 can be relieved; when the differential pressure regulating valve is in a valve closing state, the pressure of the medium in the inlet cavity 12 to the membrane 6 is smaller than the pressure of the regulating device 4 to the membrane 6, so that the valve seat 20 is blocked by the membrane 6 again, the communicating cavity 51 is blocked, and then the medium in the inlet cavity 12 cannot enter the upper part of the outlet cavity 13 through the communicating cavity 51, so that the piston 3 cannot be pushed to move, and then the valve core 2 blocks the through hole, so that the medium in the inlet cavity 12 cannot flow into the outlet cavity 13 through a gap between the valve core 2 and the through hole. The utility model provides a pair of pressure difference regulating valve, exert certain pressure to diaphragm 6 earlier adjusting device 4, part medium in the import chamber 12 enters into the intercommunication chamber 51 through pipe 10, exert pressure to diaphragm 6, when this pressure is greater than adjusting device 4 and to the pressure that diaphragm 6 applyed, diaphragm 6 shift position makes intercommunication chamber 51 switch on, can let the medium in the intercommunication chamber 51 enter into the pressure chamber and go to promote piston 3, and then piston 3 promotes case 2 and removes, make case 2 with the through-hole part is separately, pressure difference regulating valve just is in the open valve state, and then the medium in the import chamber 12 can flow into export chamber 13 through the clearance between case 2 and the through-hole, part medium in the export chamber 13 can enter into adjusting device 4 through pressure pipe 30 simultaneously, increase the pressure to diaphragm 6, the pressure of the remaining medium in the export chamber 13 can be less than the pressure of the medium in the import chamber 12, and then the condition that the water inlet and the water outlet of the pressure regulating valve have pressure difference can be formed, so that the technical problem that the pressure regulating valve in the prior art does not have the function of regulating the pressure difference of the water inlet and the water outlet is solved.

As an alternative embodiment, the adjusting device 4 includes an upper bonnet 41, an elastic member 42, a pressure adjusting member 43 and an upper bonnet 44, the upper bonnet 41 is connected with the communicating member 5 in a sealing manner, the diaphragm 6 is located between the upper bonnet 41 and the communicating member 5, and a gasket is disposed at a position where both the upper bonnet 41 and the communicating member 5 contact the diaphragm 6, in order to prevent the medium in the communicating member 5 from flowing into the upper bonnet 41 through the diaphragm 6, the upper bonnet 41 is communicated with the outlet chamber 13 through the pressure guide pipe 30, the elastic member 42 is located in the upper bonnet 41, and one end of the elastic member 42 abuts against the diaphragm 6, in order to apply an elastic force to the diaphragm 6, the other end of the elastic member 42 is connected with the pressure adjusting member 43, and the pressure adjusting member 43 can adjust the elastic force of the elastic member 42 acting on the diaphragm 6, the pressure adjusting member 43 can set the elastic force of the elastic member 42 acting on the diaphragm 6, and only when the pressure of the medium in the inlet chamber 12 on the diaphragm 6 is greater than the set elastic force, the pressure difference regulating valve is in an open state, the free end of the pressure regulating member 43 can extend out of the upper bonnet 41, so as to facilitate the regulation of the elastic force, the upper bonnet 41 is in threaded connection with the upper bonnet 44, the upper bonnet 44 can cover the free end of the pressure regulating member 43, and the upper bonnet 44 is used for protecting the pressure regulating member 43.

As an optional implementation manner, the elastic member 42 includes an adjusting spring 421, a lower spring seat 422, an upper spring seat 423, a steel ball 424 and a sliding block 425, the upper end of the adjusting spring 421 is connected to the upper spring seat 423, the end of the pressure adjusting rod 431 is connected to the upper spring seat 423, the lower end of the adjusting spring 421 is connected to the lower spring seat 422, the steel ball 424 is located between the sliding block 425 and the lower spring seat 422, the sliding block 425 abuts against the diaphragm 6, the side wall of the sliding block 425 is matched with the inner wall of the upper valve cover 41, so that the sliding block 425 is prevented from shaking, and the sliding block 425 directly applies pressure to the diaphragm 6.

As an alternative embodiment, the pressure adjusting member 43 includes a pressure adjusting rod 431, a first bolt 432 and a first washer 433, the first bolt 432 and the first washer 433 are both embedded in the upper bonnet 41, the first washer 433 is provided with a packing layer, the pressure adjusting rod 431 sequentially passes through the first bolt 432 and the first washer 433 and is connected with the upper spring seat 423, the pressure adjusting rod 431 is in threaded connection with the first bolt 432, the pressure adjusting rod 431 is rotated to move the pressure adjusting rod 431 in a direction approaching or separating from the adjusting spring 421, so that the adjusting spring 421 can be compressed, the compression amount of the adjusting spring 421 can be adjusted according to the movement amount of the pressure adjusting rod 431, and further, the elastic force of the adjusting spring 421 can be adjusted.

As an optional implementation mode, the air conditioner further comprises a needle valve 7, the needle valve 7 is located on the side face of the communicating piece 5, one end of the needle valve 7 can be inserted into the communicating piece 5, the needle valve 7 is communicated with the side communicating cavity, the needle valve 7 can be connected with a measuring device, the measuring device can detect the change of pressure in the inlet cavity 12 through the needle valve 7, the needle valve 7 comprises a needle valve body, a valve core and a nut, one end of the needle valve body extends into the side communicating cavity, the needle valve body is matched and connected with the side communicating cavity, the valve core is located in the needle valve body, and the nut is sleeved at the other end of the needle valve body.

As an alternative embodiment, the piston 3 includes a piston rod 31 and a piston block 32, the piston rod 31 is fixedly connected with the piston block 32, the free end of the piston rod 31 is connected with the valve core 2, the piston block 32 is in sealing contact with the inner wall of the outlet cavity 13, the medium entering the outlet cavity 13 from the communicating cavity 51 is used for applying pressure to the piston block 32, and the cross-sectional area of the piston block 32 is larger than that of the piston rod 31, so as to better push the valve core 2;

the piston block 32 is provided with a pressure relief hole 321, and when the differential pressure regulating valve enters a closed state from an open state, part of the medium is left in the communication cavity 51 and the pressure cavity, and the part of the medium flows into the accommodating cavity from the pressure relief hole 321 and further flows into the liquid outlet pipeline.

As an optional embodiment, the pressure difference regulating valve further comprises a manual valve opening device 8, the manual valve opening device 8 is connected with the valve body 1 in a sealing mode, the manual valve opening device 8 is connected with the valve core 2, and the manual valve opening device 8 can pull the valve core 2 to be separated from the through hole, so that a user can open the pressure difference regulating valve forcibly due to emergency.

As an alternative embodiment, the manual valve opening device 8 includes a lower bonnet 81, a manual valve rod 82, a limit sleeve 83, a second bolt 84, a second gasket 85 and a lower bonnet 86, the lower bonnet 81 is connected with the lower end of the valve body 1 in a sealing manner, the limit sleeve 83 is embedded in the valve core 2, the second bolt 84 and the second gasket 85 are embedded in the lower bonnet 81, a packing layer is arranged in the second gasket 85, the limit sleeve 83 is sleeved on one end of the manual valve rod 82 and the limit sleeve 83 limits the manual valve rod 82 to be separated from the limit sleeve 83, the free end of the manual valve rod 82 passes through the second gasket 85, the second bolt 84 and the lower bonnet 81 and extends out of the lower bonnet 81, the manual valve rod 82 is connected with the second bolt 84 in a threaded manner, the lower bonnet 86 is connected with the lower bonnet 81 in a threaded manner, the lower bonnet 86 can cover the free end of the manual valve rod 82, when the manual valve rod 82 is rotated, so that the manual valve rod 82 moves in a direction far away from the through hole, and then the valve core 2 is driven to move through the limiting sleeve 83, so that the valve core 2 is separated from the through hole, and the medium in the inlet cavity 12 flows to the outlet cavity 13.

As an optional embodiment, the valve core 2 includes a positioning column 21, a connecting piece 22 and limiting plates 23, one side of the connecting piece 22 is fixedly connected with the positioning column 21, the other side of the connecting piece 22 is fixedly connected with the limiting plates 23, the limiting plates 23 are distributed along the circumferential direction of the connecting piece 22, a gap exists between two adjacent limiting plates 23, so as to facilitate medium circulation, the piston 3 abuts against the connecting piece 22, and the limiting plates 23 and the piston 3 are located on the same side of the connecting piece 22;

the positioning column 21 is internally provided with an installation hole 211, the limiting sleeve 83 is embedded in the installation hole 211, one end of the manual valve rod 82 extends into the installation hole 211, the diameter of the end part of the manual valve rod 82 is larger than that of the limiting sleeve 83, and the end part of the manual valve rod 82 cannot be drawn out of the limiting sleeve 83 but can drive the limiting sleeve 83 to move.

As an optional embodiment, a return seat spring 9 is further included, the return seat spring 9 is located in the inlet chamber 12, the return seat spring 9 is sleeved on the valve core 2, the other end of the return seat spring 9 is connected to the lower valve cover 81, and when the differential pressure regulating valve enters the valve closing state from the valve opening state, the elastic force of the return seat spring 9 can move the valve core 2 until the valve core 2 blocks the through hole.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A differential pressure regulating valve is characterized by comprising a valve body (1), a valve core (2), a piston (3), a regulating device (4), a communicating piece (5) and a pressure guide pipe (30), wherein,

a partition plate (11) is arranged in the valve body (1), the partition plate (11) divides the interior of the valve body (1) into an inlet cavity (12) and an outlet cavity (13), a through hole is formed in the partition plate (11), and the inlet cavity (12) is communicated with the outlet cavity (13) through the through hole;

the valve core (2) is connected with one end of the piston (3), the other end of the piston (3) is in sealing contact with the inner wall of the outlet cavity (13), the piston (3) can move on the inner wall of the outlet cavity (13), the valve core (2) can block the through hole, and the piston (3) can push the valve core (2) and can separate the valve core (2) from the through hole;

the valve body (1) is connected with the communicating piece (5) in a sealing mode, the adjusting device (4) is connected with the communicating piece (5) in a sealing mode, a membrane (6) is arranged between the adjusting device (4) and the communicating piece (5), a communicating cavity (51) is arranged inside the communicating piece (5), one end of the communicating cavity (51) is communicated with the outlet cavity (13), the other end of the communicating cavity (51) is communicated with the inlet cavity (12) through a conduit (10), and the communicating cavity (51) can be blocked by the membrane (6);

the outlet cavity (13) is communicated with the adjusting device (4) through the pressure guide pipe (30), and part of the medium in the outlet cavity (13) enters the adjusting device (4) through the pressure guide pipe (30) and can apply pressure to the diaphragm (6);

the pressure difference regulating valve has an open valve state and a closed valve state, when the pressure difference regulating valve is in the open valve state, the pressure of a medium in the inlet cavity (12) to the diaphragm (6) is greater than the pressure of the regulating device (4) to the diaphragm (6), part of the medium in the inlet cavity (12) enters the communicating cavity (51) through the conduit (10) and can push the diaphragm (6) to conduct the communicating cavity (51), the medium in the communicating cavity (51) can enter the outlet cavity (13) and can push the piston (3) to move so as to separate the valve core (2) from the through hole, the medium in the inlet cavity (12) flows into the outlet cavity (13) through a gap between the valve core (2) and the through hole, and part of the medium in the outlet cavity (13) enters the regulating device (4) through the pressure guide pipe (30), increasing the pressure of the regulating device (4) against the diaphragm (6).

2. The differential pressure regulating valve according to claim 1, wherein the regulating device (4) comprises an upper valve cover (41), an elastic member (42), a pressure regulating member (43) and an upper valve cap (44), the upper valve cover (41) is connected with the communicating member (5) in a sealing manner, the upper valve cover (41) is communicated with the outlet cavity (13) through the pressure guide pipe (30), the elastic member (42) is positioned in the upper valve cover (41) and one end of the elastic member (42) abuts on the diaphragm (6), the other end of the elastic member (42) is connected with the pressure regulating member (43) and the pressure regulating member (43) can regulate the elastic force of the elastic member (42) acting on the diaphragm (6), the free end of the pressure regulating member (43) can extend out of the upper valve cover (41), the upper valve cover (41) is in threaded connection with the upper valve cap (44) and the upper valve cap (44) can cover the pressure regulating member (6) (43) The free end of (a).

3. The differential pressure regulating valve according to claim 2, wherein the elastic member (42) comprises a regulating spring (421), a lower spring seat (422), an upper spring seat (423), a steel ball (424) and a sliding block (425), the upper end of the regulating spring (421) is connected with the upper spring seat (423), the lower end of the regulating spring (421) is connected with the lower spring seat (422), the steel ball (424) is located between the sliding block (425) and the lower spring seat (422), and the sliding block (425) abuts against the diaphragm (6).

4. The differential pressure regulating valve according to claim 2, wherein the pressure regulating member (43) comprises a pressure regulating rod (431), a first bolt (432) and a first washer (433), the first bolt (432) and the first washer (433) are embedded in the upper valve cover (41), the pressure regulating rod (431) passes through the first bolt (432) and the first washer (433) in sequence and is connected with the elastic member (42), and the pressure regulating rod (431) is in threaded connection with the first bolt (432).

5. The differential pressure regulating valve according to claim 1, further comprising a needle valve (7), wherein the needle valve (7) is located on the side surface of the communicating member (5), one end of the needle valve (7) can be inserted into the communicating member (5) and the needle valve (7) is communicated with the communicating chamber (51), and the needle valve (7) can be connected with a measuring device.

6. The differential pressure regulating valve according to claim 1, wherein the piston (3) comprises a piston rod (31) and a piston block (32), the piston rod (31) is fixedly connected with the piston block (32), the free end of the piston rod (31) is connected with the valve core (2), the piston block (32) is in sealing contact with the inner wall of the outlet cavity (13), and the cross-sectional area of the piston block (32) is larger than that of the piston rod (31);

the piston block (32) is provided with a pressure relief hole (321).

7. The differential pressure regulating valve according to claim 1, further comprising a manual valve opening device (8), wherein the manual valve opening device (8) is connected with the valve body (1) in a sealing manner, the manual valve opening device (8) is connected with the valve core (2), and the manual valve opening device (8) can pull the valve core (2) away from the through hole.

8. The differential pressure regulating valve according to claim 7, wherein the manual valve opening device (8) comprises a lower valve cover (81), a manual valve rod (82), a limit sleeve (83), a second bolt (84), a second gasket (85) and a lower valve cap (86), the lower valve cover (81) is connected with the valve body (1) in a sealing manner, the limit sleeve (83) is embedded in the valve core (2), the second bolt (84) and the second gasket (85) are embedded in the lower valve cover (81), the limit sleeve (83) is sleeved on one end of the manual valve rod (82) and limits the manual valve rod (82) to be separated from the limit sleeve (83), the free end of the manual valve rod (82) passes through the second gasket (85), the second bolt (84) and the lower valve cover (81), and the free end of the manual valve rod (82) extends out of the lower valve cover (81), the manual valve rod (82) is in threaded connection with the second bolt (84), the lower valve cap (86) is in threaded connection with the lower valve cap (81), and the lower valve cap (86) can cover the free end of the manual valve rod (82).

9. The differential pressure regulating valve according to claim 1, wherein the spool (2) comprises a positioning column (21), a connecting piece (22) and a limiting plate (23), one side of the connecting piece (22) is fixedly connected with the positioning column (21), the other side of the connecting piece (22) is fixedly connected with the limiting plate (23), the limiting plates (23) are distributed along the circumferential direction of the connecting piece (22), the piston (3) abuts against the connecting piece (22), and the limiting plate (23) and the piston (3) are positioned on the same side of the connecting piece (22);

and a mounting hole (211) is formed in the positioning column (21).

10. The differential pressure regulating valve according to claim 1, further comprising a return seat spring (9), wherein the return seat spring (9) is located in the inlet chamber (12), the return seat spring (9) is sleeved on the valve core (2), and the elastic force of the return seat spring (9) can move the valve core (2) until the valve core (2) blocks the through hole.