CN117108764A

CN117108764A - Pressure-controlled back pressure valve and control method thereof

Info

Publication number: CN117108764A
Application number: CN202311378600.7A
Authority: CN
Inventors: 张齐
Original assignee: Shanghai Longmeng Machinery Co ltd
Current assignee: Shanghai Longmeng Machinery Co ltd
Priority date: 2023-10-24
Filing date: 2023-10-24
Publication date: 2023-11-24
Anticipated expiration: 2043-10-24
Also published as: CN117108764B

Abstract

The invention relates to the technical field of valves and discloses a pressure control backpressure valve and a control method thereof, wherein the pressure control backpressure valve comprises a valve body and a valve bonnet connected with the valve body, a diaphragm member, a valve plug, a valve core, a damping member and a pressure regulating structure are arranged in the valve bonnet, a liquid flow hole is formed in the valve body, the diaphragm member is arranged between the valve bonnet and the valve body, the valve plug is arranged in the valve bonnet and connected with the diaphragm member, the valve plug is used for closing or opening the liquid flow hole, the valve core is connected with the valve plug, the damping member is used for providing magnetic attraction and acting on the valve core so as to push the valve plug to abut against the valve body and close the liquid flow hole, the pressure regulating structure is used for regulating the magnetic attraction of the valve core so as to regulate the closing pressure of the liquid flow hole by the valve plug, and when the valve core is pushed to be opened by the valve core by overcoming the closing pressure, the magnetic attraction is pushed by the valve core to move axially along the valve core. The damping piece provides stable magnetic attraction force, so that stable sealing pressure is provided, and the sealing pressure can be adjusted under the action of the pressure adjusting structure.

Description

Pressure-controlled back pressure valve and control method thereof

Technical Field

The invention relates to the technical field of valves, in particular to a back pressure valve controlled by pressure and a control method thereof.

Background

The back pressure valve is a pressure regulating valve element in a fluid line, which is capable of maintaining a downstream pressure when the fluid pressure in the line is unstable, and thus is widely used in various industrial and residential lines, or in pressure vessels.

The prior patent application publication No. CN115183035A discloses a back pressure valve which comprises a valve seat, a valve cover, a valve core component and an adjusting component; the side wall of the valve seat is respectively provided with an inlet channel and an outlet channel which are communicated with the inner wall and the outer wall; the valve cover is matched with the valve seat and forms a cavity with the valve seat; the valve core assembly is arranged in the valve seat and divides the cavity into a first accommodating cavity and a second accommodating cavity, and can seal a first port of the outlet channel far away from the outer wall of the valve seat; the adjusting component is positioned in the second accommodating cavity and comprises an elastic piece and a first limiting piece which are coaxially arranged, the first limiting piece is matched between the inner side wall surface of the valve cover, and the inner side wall surface of the valve cover limits the tendency of non-axial movement of the first limiting piece; the first limiting piece comprises a first limiting structure, one end of the elastic piece is connected with the valve core assembly, and the other end of the elastic piece is fixedly connected with the first limiting structure.

The back pressure valve can be used for adjusting the pressure value of the back pressure through the elastic piece in the adjusting component so as to carry out adjustment control according to the pressure required by the downstream, but the elastic piece is a spring, the spring can be used for fatigue along with the increase of the frequency of use, so that the attenuation of the elastic force is caused, the sealing effect of the valve core component in the back pressure valve is reduced, the fluid pressure of the outlet channel can not reach the expected pressure, and the back pressure valve for providing stable damping force for pressure control is needed, and can carry out adjustment control on the damping force according to the requirement of the downstream pressure.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide a back pressure valve controlled by pressure and a control method thereof, which have the effects of providing stable closing pressure and adjusting the closing pressure.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a pressure-controlled back pressure valve and a control method thereof, comprising:

the valve body is provided with a fluid inlet, a fluid outlet and a blind hole, a hole sleeve is arranged at the blind hole, and a liquid flow hole is formed in the hole sleeve;

further comprises:

the valve bonnet is connected with the valve body, and an inner cavity is formed in the valve bonnet;

the diaphragm piece is arranged between the valve cap and the valve body and divides the inner cavity into a liquid flow cavity and a valve control cavity;

the valve plug is arranged in the valve control cavity and is connected with the diaphragm piece;

the damping piece is arranged in the valve control cavity;

a valve core; the valve core is connected with the valve plug, and the damping piece is used for providing magnetic attraction and acting on the valve core so as to push the valve plug to abut against the valve body and seal the liquid flow hole;

the pressure regulating structure is used for regulating the magnetic attraction force applied to the valve core so as to regulate the closing pressure of the valve plug closing the hydraulic hole;

when the pressure at the fluid inlet in the valve body overcomes the closing pressure to push the valve plug to open, the valve plug is pushed to overcome the magnetic attraction and move along the axial direction of the valve plug.

As a further development of the invention, the valve element comprises a core rod and a magnetic element, which is arranged coaxially to the core rod.

As a further improvement of the invention, the pressure regulating structure comprises a driving motor and a transmission assembly, wherein the transmission assembly is used for connecting the driving motor with the damping piece or connecting the driving motor with the valve core, and the driving motor is used for regulating the relative positions of the damping piece and the valve core through the transmission assembly so as to regulate the magnitude of the magnetic attraction force born by the valve core.

As a further improvement of the valve cap, a limiting support is further arranged in the valve cap and used for limiting the valve core when the valve plug opens the hydraulic hole, and at the moment, the damping piece keeps magnetic attraction to the valve core and the magnetic attraction is smaller than the closing pressure.

As a further improvement of the present invention, a retainer is further attached to the valve plug for connecting the diaphragm member to the valve plug and retaining the diaphragm member in connection with the valve plug when opening or closing the hydraulic orifice.

As a further improvement of the invention, the transmission assembly comprises a screw sleeve, a gear ring and a transmission gear, wherein an installation seat is arranged in the valve cap, the gear ring is arranged in the installation seat, rolling parts are respectively arranged on two sides of the gear ring, the damping parts are arranged in the screw sleeve, the screw sleeve is in threaded connection with the inner diameter of the gear ring, the driving motor is arranged in the valve cap, the transmission gear is fixedly connected with an output shaft of the driving motor in a coaxial manner, and the transmission gear is meshed with the gear ring.

As a further improvement of the invention, the transmission assembly comprises a speed reducer, a guide seat and a screw rod, one end of the core rod is in threaded connection with the valve plug, the other end of the core rod is provided with a mounting groove, the guide seat is in sliding connection with the mounting groove, the magnetic force piece is arranged in the guide seat, the driving motor is arranged on the valve cap and is connected with the input end of the speed reducer, one end of the screw rod is fixedly connected with the output end of the speed reducer coaxially, the other end of the screw rod is in threaded connection with the guide seat, and the driving motor is used for driving the screw rod to rotate and driving the guide seat to slide along the mounting groove so as to adjust the relative position of the magnetic force piece and the damping piece.

As a further improvement of the invention, the liquid flow hole is provided with a pressure sensor which is used for sensing the sealing pressure of the valve plug, the back pressure valve also comprises a regulating processor, the valve cap is provided with a mounting cavity for the processor to mount, the valve cap is provided with a display, the regulating processor is internally provided with a monitoring module and a regulating module, the monitoring module is internally provided with a monitoring strategy, the monitoring strategy comprises the mode of regulating a damping piece, acquiring the pressure range of the sealing pressure, forming pressure data and sending the pressure data to the display for displaying the value of the pressure range, and the regulating module is internally provided with a regulating strategy, wherein the regulating strategy comprises the magnetic attraction force applied by the regulating valve plug and is displayed on the display, and when the set sealing pressure is received, a regulating signal is generated to control the regulating structure to regulate the sealing pressure.

A control method of a back pressure valve controlled by pressure comprises the following steps:

selecting a valve core, assembling the valve core with the valve plug, placing a diaphragm piece on the valve body, connecting the valve plug with the diaphragm piece, sleeving a valve cap, and connecting the valve cap with the valve body so as to separate an inner cavity to form a liquid flow cavity and a valve control cavity under the action of the diaphragm piece;

selecting a damping piece, and sleeving the damping piece into the valve control cavity along the valve core;

installing a pressure regulating structure so that the pressure regulating structure is used for regulating the relative position between the damping piece and the valve core;

setting a sealing pressure on the display, and adjusting the relative position between the damping piece and the valve core through the pressure adjusting structure, so that the pressure sensor senses the sealing pressure conducted by the valve plug and displays the value of the sealing pressure on the display, and when the display displays that the value of the sealing pressure is consistent with the preset value of the sealing pressure, the pressure adjusting structure is controlled to stop, and at the moment, the magnetic attraction provided by the damping piece is equal to the preset sealing pressure.

As a further improvement of the invention, the closing pressure is monitored in real time when fluid is detected at the fluid inlet of the valve body;

monitoring fluid pressure at the fluid inlet, and controlling the valve plug to open the hydraulic orifice according to the monitored fluid pressure;

if the liquid flow hole is opened after the closing pressure is not detected or the liquid flow hole is not opened after the closing pressure is detected, the regulating processor controls the pressure regulating structure to correct and regulate the magnetic attraction force, so that the valve plug is pushed to open the liquid flow hole when the fluid pressure breaks through the closing pressure, and the valve core is driven to move along the valve control cavity.

The invention has the beneficial effects that:

1. the valve is characterized in that a damping piece is arranged in the valve control cavity to provide stable magnetic attraction force for the valve core, the valve core is connected with the valve plug, so that the valve plug seals the liquid flow hole under the action of the magnetic attraction force, the sealing pressure of the valve plug seals the liquid flow hole and the magnetic attraction force are equal, when the magnetic attraction force born by the valve core is regulated by the relative position regulating valve core through the pressure regulating structure, the regulation of the sealing pressure is realized, when the fluid pressure of the fluid inlet breaks through the sealing pressure, the liquid flow hole is opened, at the moment, the valve plug moves to drive the valve core to move, the relative position between the valve core and the damping piece is changed, the magnetic attraction force born by the valve core is weakened, the valve plug is opened stably, so that fluid can enter the fluid outlet through the liquid flow cavity, and if the pressure of the fluid inlet is reduced, the valve core gradually seals the liquid flow hole under the action of the magnetic attraction force, and the circulation of the fluid is cut off;

2. the type of the damping member and the valve core can be adjusted according to the use environment of the back pressure valve and the pressure range of the fluid outlet, so that the damping member can provide enough magnetic attraction force for controlling the valve plug to close the liquid flow hole.

Drawings

FIG. 1 is a schematic perspective view of a back pressure valve;

FIG. 2 is an exploded view of a back pressure valve in accordance with the first embodiment;

FIG. 3 is a cross-sectional isometric view of a back pressure valve in accordance with one embodiment;

FIG. 4 is a schematic cross-sectional view of a back pressure valve in accordance with one embodiment;

FIG. 5 is an exploded view of a back pressure valve in a second embodiment;

FIG. 6 is a cross-sectional isometric view of a back pressure valve in accordance with a second embodiment;

FIG. 7 is a schematic cross-sectional view of a back pressure valve in accordance with a second embodiment;

FIG. 8 is a system diagram of a conditioning process;

FIG. 9 is a flow chart of a system in which the regulating module controls the regulating control of the pressure regulating structure.

Reference numerals: 1. a valve body; 11. a fluid inlet; 12. a fluid outlet; 13. a blind hole; 14. a hole sleeve; 15. a liquid flow hole; 16. a fluid flow chamber; 17. a valve controlled cavity; 2. a valve cap; 21. a limit bracket; 22. a pipe sleeve; 23. a mounting base; 24. a support base; 25. a guide bracket; 26. an inner cavity; 3. a diaphragm member; 4. a valve plug; 41. a holder; 5. a damping member; 6. a valve core; 61. a core bar; 62. a magnetic member; 7. a pressure regulating structure; 8. a driving motor; 9. a transmission assembly; 91. a screw sleeve; 92. a gear ring; 93. a transmission gear; 94. a speed reducer; 95. a guide seat; 951. a base; 952. a cover body; 96. a screw; 10. a display; 20. and a protective sleeve.

Detailed Description

The invention will now be described in further detail with reference to the drawings and examples. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

Example 1

Referring to fig. 1 to 4, in order to provide a specific embodiment of a back pressure valve with pressure control according to the present invention, the back pressure valve comprises a valve body 1 and a valve cap 2 connected to the valve body 1, wherein the valve body 1 and the valve cap 2 are made of carbon steel and are nickel plated, and the valve cap 2 is connected to the valve body 1 by a threaded connection and a flange connection. The valve body 1 is provided with a fluid inlet 11, a fluid outlet 12 and a blind hole 13, a hole sleeve 14 is arranged at the blind hole 13, a liquid flow hole 15 is arranged on the hole sleeve 14, the hole sleeve 14 is in threaded connection with the blind hole 13, an inner cavity 26 is formed in the valve cap 2, a protective sleeve 20 is further in threaded connection with the valve cap 2, and a rotary direction indication mark is arranged on the protective sleeve 20.

The valve body 1 is provided with the diaphragm piece 3 with the inner chamber 26 separation formation liquid flow chamber 16 and valve accuse chamber 17 between valve cap 2, be connected with valve plug 4 on the diaphragm piece 3, be provided with damping piece 5 in the valve accuse chamber 17, case 6 and pressure regulating structure 7, case 6 is connected with valve plug 4, damping piece 5 is used for providing magnetic attraction and acts on case 6, make case 6 drive valve plug 4 seal liquid flow hole 15, the valve plug 4 is the same with the magnitude of magnetic attraction to liquid flow hole 15 confined closure force, pressure regulating structure 7 is used for adjusting damping piece 5 and valve plug 6's relative position, thereby adjust the magnitude of the magnetic attraction that valve plug 6 received and adjust valve plug 4 to liquid flow hole 15's closure pressure, owing to the stable magnetic attraction control valve plug 4's that adopts, make confined stability high, be difficult for causing the problem that the closure pressure to fade along with the use number of times, when the fluid pressure of fluid inlet 11 breaks through pushing against the pressure, valve plug 4 opens liquid 15, make the fluid flow through liquid flow hole 16 and into fluid outlet 12 keep stable outflow pressure. The valve plug 4 is further connected with a retainer 41, and the retainer 41 is in threaded connection with the valve plug 4 and is used for fixedly connecting the diaphragm member 3 with the valve plug 4, so that the diaphragm member 3 keeps connected with the valve plug 4 when the hydraulic hole 15 is opened or closed.

The valve core 6 comprises a core bar 61 and a magnetic member 62, the magnetic member 62 is coaxially arranged in the core bar 61, the damping member 5 and the magnetic member 62 are permanent magnets respectively, the damping member 5 is arranged outside the core bar 61 and is arranged along the circumferential direction of the core bar 61, at this time, the damping member 5 can be an annular permanent magnet, a plurality of rectangular permanent magnets can be arranged along the circumferential array outside the core bar 61, the magnetic member 62 is partially positioned in the damping member 5, the magnetic pole of the magnetic member 62 penetrating out of the damping member 5 is opposite to the magnetic pole of the damping member 5, so that the damping member 5 is used for attracting the magnetic member 62, and when the relative positions of the magnetic member 62 and the damping member 5 are regulated, as the interaction between the magnetic poles is influenced by the distance, when the distance between the magnetic poles of the magnetic member 62 and the damping member 5 is increased, the magnetic attraction is gradually reduced, and conversely when the distance between the magnetic poles is reduced, the magnetic attraction is gradually increased. A limit bracket 21 is further disposed in the valve cap 2, the limit bracket 21 is used for limiting the maximum displacement of the core bar 61, and when the core bar 61 is in contact with the limit bracket 21, the damping member 5 keeps providing magnetic attraction to the core bar 61, so that when the core bar 61 is not acted by external force, the magnetic attraction provided by the damping member 5 drives the core bar 61 to reset, and the valve plug 4 closes the hydraulic hole 15.

The pressure regulating structure 7 includes driving motor 8 and drive assembly 9, driving motor 8 adopts servo motor, drive assembly 9 is used for connecting driving motor 8 and damping piece 5, drive assembly 9 includes swivel nut 91, ring gear 92 and drive gear 93, be provided with mount pad 23 in the valve cap 2, the ring gear 92 sets up in mount pad 23, the both sides of ring gear 92 are provided with the rolling element respectively, make the ring gear 92 be fixed in the valve cap 2 under the spacing effect of mount pad 23, and the frictional force when making the ring gear 92 rotate under the effect of rolling element reduces, and can rotate in the mount pad 23, the rolling element is selected as the ball, a plurality of rolling elements are inlayed respectively to the both sides of ring gear 92, thereby reduce the rotatory frictional force of ring gear 92. The motor chamber has been seted up to one side of valve cap 2 to the motor chamber runs through one side outer wall of valve cap 2, at valve cap 2 outer wall connection motor cover, thereby conveniently dismouting to driving motor 8, driving motor 8's coaxial fixed connection drive gear 93 of output shaft, in one side of drive gear 93 extends to valve accuse chamber 17, the arc wall has been seted up towards one side of drive gear 93 at mount pad 23, the part that drive gear 93 extends to valve accuse intracavity 17 penetrates in the arc wall and meshes with ring gear 92, make drive ring gear 92 rotate under driving motor 8 drives the pivoted effect of drive gear 93. The inner diameter of the gear ring 92 is in threaded connection with the threaded sleeve 91, the damping piece 5 is embedded in the threaded sleeve 91 in a tight fit connection mode, when the closing pressure needs to be adjusted, the driving motor 8 drives the transmission assembly 9 to move, the damping piece 5 is driven to move along the axial direction of the core rod 61, the distance between the damping piece 5 and the magnetic piece 62 is adjusted, the magnetic attraction is adjusted, and the closing pressure adjusting effect is achieved.

The integral back pressure valve can determine the extreme value range of the closing pressure of the valve plug 4 on the liquid flow hole 15 by selecting the sizes of the damping piece 5 and the magnetic piece 62, determine the adjusting range between the damping piece 5 and the magnetic piece 62 according to the extreme value range, and determine the sizes and the number of teeth of the gear ring 92 and the transmission gear 93 according to the adjusting range so as to realize accurate control on the position of the damping piece 5. Since the force between the damping member 5 and the magnetic member 62 is maintained as a magnetic attraction force so that the closing pressure is fixed after fixing the position between the damping member 5 and the magnetic member 62, the movement stroke of the valve plug 4 has the maximum displacement position since the valve plug 4 is connected to the diaphragm member 3. When the back pressure valve works, the valve plug 4 is pushed to open the liquid flow hole 15 when the fluid pressure at the fluid inlet 11 breaks through the pushing pressure, and the breaking through pushing pressure means that the fluid pressure is larger than the pushing pressure, for example: when the pushing pressure is 10N, the valve plug 4 is pushed to open when the fluid pressure reaches 10N or more. Because the core rod 61 is connected with the valve plug 4, when the valve plug 4 opens the liquid flow hole 15, the core rod 61 is driven to move along the axial direction, after the core rod 61 moves, the relative position between the damping piece 5 and the magnetic piece 62 is changed, the magnetic attraction force is reduced at the moment, but the magnetic attraction force is kept, so that the liquid pressure is stable at break-through pushing pressure or keeps the opening of the liquid flow hole 15 when the liquid pressure is consistent with the magnetic attraction force after the core rod 61 moves, but when the liquid pressure is smaller than the pushing pressure, the valve plug 4 can rapidly close the liquid flow hole 15 under the action of the magnetic attraction force, and when the liquid flow hole 15 is closed, the core rod 61 is reset, and the closing pressure is kept at the preset closing pressure at the moment.

The spacing bracket 21 is connected with the valve cap 2 through a screw 96, the screw 96 is provided with a pipe sleeve 22, one end of the pipe sleeve 22 is abutted against the valve cap 2, the other end is abutted against the spacing bracket 21, the spacing between the spacing bracket 21 and the valve cap 2 can be adjusted when the pipe sleeve 22 with different sizes is replaced, the position of the spacing bracket 21 is adjusted according to the minimum closing pressure set after the selection and the opening maximum displacement position of the valve plug 4, the position of the spacing bracket 21 is adjusted at the moment, when the valve plug 4 is opened and moved to the maximum displacement position, the core rod 61 is abutted against the spacing bracket 21, and at the moment, the damping piece 5 and the magnetic piece 62 still keep magnetic attraction, so that the whole back pressure valve works in the state of the minimum closing pressure, when the pressure of the fluid inlet 11 is smaller than the closing pressure, the damping force attraction core rod 61 is reset to move, and the valve plug 4 is driven to close the liquid flow hole 15.

Example two

Referring to fig. 5 to 7, the first difference between the present embodiment and the first embodiment is that a supporting seat 24 is disposed in the valve control cavity 17, the supporting seat 24 is fixedly connected with the valve cap 2, the damping member 5 is disposed in the supporting seat 24 in a tight-fit connection manner, a guiding bracket 25 is also fixed in the valve control cavity 17, a core bar 61 is disposed along the guiding bracket 25, a rib is disposed on a wall of the core bar 61, and a rib groove for sliding the rib is disposed in the guiding bracket 25, so that when the valve plug 4 opens the hydraulic hole 15, the core bar 61 moves along the guiding bracket 25. The transmission assembly 9 comprises a speed reducer 94, a guide seat 95 and a screw rod 96, wherein one end of a core rod 61 is in threaded connection with a valve plug 4, an installation groove is formed in the other end of the core rod 61, the installation groove is formed in the axial direction of the core rod 61, the guide seat 95 is in sliding connection with the installation groove, the guide seat 95 comprises a seat body 951 and a cover body 952, a straight groove is further formed in the inner wall of the core rod 61, a straight edge which is in sliding connection with the straight groove is arranged on the outer wall of the seat body 951, a magnetic member 62 is arranged in the seat body 951, the cover body 952 is connected with the seat body 951 through a screw, the magnetic member 62 is used for fixing the magnetic member 62, a driving motor 8 is arranged on the valve cap 2 and is connected with the input end of the speed reducer 94, one end of the screw rod 96 is in coaxial fixed connection with the output end of the speed reducer 94, the other end of the screw rod is in threaded connection with one end of the cover 952, which is away from the seat body 951, and the depth of the opening screw thread in the cover 952 is larger than the width of the screw rod 96 and the threaded connection with the cover body. When the driving motor 8 is decelerated by the decelerator 94, the screw 96 is driven to rotate, and as the screw 96 is in threaded connection with the cover 952 and the straight edge on the base 951 is in sliding connection with the straight groove, the screw 96 drives the cover 952 to move along the axis of the core rod 61 in the mounting groove, thereby driving the magnetic member 62 to adjust along the position of the core rod 61, thereby realizing the adjustment of the relative position between the damping member 5 and the magnetic member 62, adjusting the magnitude of the magnetic attraction force, and achieving the effect of adjusting the sealing pressure.

Example III

Referring to fig. 2, 8 and 9, the present embodiment provides a back pressure valve controlled by pressure, which is different from the second embodiment in that the back pressure valve further includes a pressure sensor and a regulating processor, the pressure sensor is disposed on one side of the liquid flow hole 15, and the pressure sensor is used for sensing the closing pressure when the valve plug 4 closes the liquid flow hole 15, and forming a closing pressure value signal. The bonnet 2 is provided with an installation cavity for installing a regulating processor, and the outer side wall of the bonnet 2 is also provided with a display 10, wherein the display 10 is used for displaying the closed pressure value and the set extreme value range. The regulation and control processor is internally provided with a monitoring module and an adjusting module, the monitoring module is internally provided with a monitoring strategy, the adjusting module is internally provided with an adjusting strategy, the pressure regulating structure 7 is used for controlling the magnetic attraction force to be regulated based on the monitoring module for monitoring the sealing pressure and displaying the sealing pressure on the display 10, and the adjusting module is used for regulating the sealing pressure value.

The monitoring module is also internally provided with a simulation model and an input unit, the input unit is used for inputting model data of the damping piece 5 and the magnetic piece 62 after the model selection is determined, the model data comprises thickness information, length information and magnetic flux information, the simulation model is used for calling the model data, a simulation image is formed according to the model data, the simulation image is used for simulating and displaying the damping piece 5 and the magnetic piece 62, magnetic induction lines are established, magnetic poles are displayed on the simulation image, magnetic force distribution and magnetic force values of the damping piece 5 and the magnetic piece 62 at different positions are simulated according to the simulation image, the position of the maximum magnetic attraction force is marked with the maximum mark, the position of the minimum magnetic attraction force is marked with the minimum mark, the distance value when the maximum mark and the minimum mark are obtained is used as a travel distance, the magnetic attraction force when the maximum mark is obtained, and the magnetic attraction force when the minimum mark is obtained.

The monitoring strategy specifically comprises the following steps:

and (3) taking and recording model data, simultaneously taking the maximum magnetic attraction force and the minimum magnetic attraction force, assigning the maximum magnetic attraction force as the maximum value of the sealing pressure, assigning the minimum magnetic attraction force as the minimum value of the sealing pressure, and displaying the maximum value and the minimum value of the sealing pressure in the display 10. When the back pressure valve is in operation, the real-time closing pressure of the pressure sensor is acquired and the real-time closing pressure value is displayed on the display 10.

The input unit is also used for inputting a closing pressure value, and the regulation strategy specifically comprises:

and taking the sealing pressure value and the real-time sealing pressure input through the input unit, performing difference processing according to the input sealing pressure value and the real-time sealing pressure value to obtain a pressure difference value, generating an adjusting signal according to the pressure difference value to control the pressure adjusting structure 7 to adjust the relative position between the damping piece 5 and the magnetic piece 62, and if the pressure difference value is a negative value, representing that the real-time sealing pressure value is larger than the input sealing pressure value, controlling the pressure adjusting structure 7 to adjust the relative distance between the damping piece 5 and the magnetic piece 62 to increase so as to reduce the real-time sealing pressure value, and stopping adjusting when the input sealing pressure value is reached. If the pressure difference is positive, the input closing pressure value is larger than the real-time closing pressure value, and the relative distance between the damping element 5 and the magnetic element 62 is adjusted to be reduced, so that the real-time closing pressure value is increased.

Working principle and effect:

the connection mode of the damping piece 5 and the magnetic piece 62 is determined through the selection, the pressure regulating structure 7 is determined, the pressure regulating structure 7 is installed, the input unit is used for inputting the expected sealing pressure value, the relative positions of the damping piece 5 and the magnetic piece 62 are controlled and regulated through the pressure regulating structure 7, so that the valve plug 4 presses against the pressure sensor and displays real-time sealing pressure on the display 10, and the damping piece 5 and the magnetic piece 62 are accurately regulated to the positions consistent with the input sealing pressure value. When the fluid pressure of the fluid inlet 11 breaks through the sealing pressure, the fluid flow hole 15 is opened, at the moment, the valve plug 4 moves to drive the valve core 6 to move, the relative position between the valve core 6 and the damping piece 5 is changed, the magnetic attraction force born by the valve core 6 is weakened, the valve plug 4 is in a stable position after being opened, fluid can enter the fluid outlet 12 through the fluid flow cavity 16, and if the pressure of the fluid inlet 11 is reduced, the valve core 6 gradually seals the fluid flow hole 15 under the action of the magnetic attraction force, so that the circulation of the fluid is blocked. It is achieved that the type of damping member 5 and valve element 6 can be adjusted depending on the environment of use of the back pressure valve and the pressure range of the fluid outlet 12, so that the damping member 5 can provide sufficient magnetic attraction for controlling the closure of the valve plug 4 to the flow orifice 15.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.

Claims

1. A pressure controlled back pressure valve comprising:

the valve comprises a valve body (1), wherein the valve body (1) is provided with a fluid inlet (11), a fluid outlet (12) and a blind hole (13), a hole sleeve (14) is arranged at the blind hole (13), and a liquid flow hole (15) is formed in the hole sleeve (14);

the method is characterized in that: further comprises: the valve bonnet (2) is connected with the valve body (1), and an inner cavity (26) is formed in the valve bonnet (2);

a diaphragm member (3), wherein the diaphragm member (3) is arranged between the valve cap (2) and the valve body (1), and the diaphragm member (3) divides the inner cavity (26) into a liquid flow cavity (16) and a valve control cavity (17);

the valve plug (4) is arranged in the valve control cavity (17) and is connected with the diaphragm piece (3);

the damping piece (5) is arranged in the valve control cavity (17);

a valve core (6); the valve core (6) is connected with the valve plug (4), and the damping piece (5) is used for providing magnetic attraction and acting on the valve core (6) so as to push the valve plug (4) to prop against the valve body (1) and seal the liquid flow hole (15);

the pressure regulating structure (7) is used for regulating the magnetic attraction force received by the valve core (6) so as to regulate the closing pressure of the valve plug (4) for closing the liquid flow hole (15);

when the valve plug (4) is pushed to be opened by the pressure at the fluid inlet (11) in the valve body (1) against the closing pressure, the valve core (6) is pushed to overcome the magnetic attraction and move along the axial direction of the valve core (6).

2. A pressure controlled back pressure valve according to claim 1, wherein: the valve core (6) comprises a core rod (61) and a magnetic force piece (62), wherein the magnetic force piece (62) and the core rod (61) are coaxially arranged.

3. A pressure controlled back pressure valve according to claim 2, wherein: the pressure regulating structure (7) comprises a driving motor (8) and a transmission assembly (9), wherein the transmission assembly (9) is used for connecting the driving motor (8) with the damping piece (5) or connecting the driving motor (8) with the valve core (6), and the driving motor (8) adjusts the relative positions of the damping piece (5) and the valve core (6) through the transmission assembly (9) so as to adjust the size of the magnetic attraction force received by the valve core (6).

4. A pressure controlled back pressure valve according to claim 3, wherein: still be provided with spacing support (21) in valve cap (2), spacing support (21) are used for valve plug (4) to carry out spacingly to case (6) when opening hydraulic flow hole (15), and damping piece (5) keep to the magnetic attraction of case (6) and magnetic attraction be less than the closure pressure this moment.

5. A pressure controlled back pressure valve according to claim 3 or 4, wherein: the valve plug (4) is also connected with a retainer (41), and the retainer (41) is used for connecting the diaphragm piece (3) with the valve plug (4) and keeping the diaphragm piece (3) connected with the valve plug (4) when the hydraulic hole (15) is opened or closed.

6. A pressure controlled back pressure valve according to claim 5, wherein: the transmission assembly (9) comprises a threaded sleeve (91), a gear ring (92) and a transmission gear (93), wherein an installation seat (23) is arranged in the valve cap (2), the gear ring (92) is arranged in the installation seat (23), rolling elements are respectively arranged on two sides of the gear ring (92), a damping element (5) is arranged in the threaded sleeve (91), the threaded sleeve (91) is in threaded connection with the inner diameter of the gear ring (92), a driving motor (8) is arranged in the valve cap (2), the transmission gear (93) is fixedly connected with an output shaft of the driving motor (8) in a coaxial mode, and the transmission gear (93) is meshed with the gear ring (92).

7. A pressure controlled back pressure valve according to claim 5, wherein: the transmission assembly (9) comprises a speed reducer (94), a guide seat (95) and a screw rod (96), wherein one end of a core rod (61) is in threaded connection with a valve plug (4), an installation groove is formed in the other end of the core rod, the guide seat (95) is in sliding connection with the installation groove, a magnetic part (62) is arranged in the guide seat (95), a driving motor (8) is arranged on a valve cap (2) and is connected with the input end of the speed reducer (94), one end of the screw rod (96) is fixedly connected with the output end of the speed reducer (94) coaxially, the other end of the screw rod is in threaded connection with the guide seat (95), the driving motor (8) is used for driving the screw rod (96) to rotate and drives the guide seat (95) to slide along the installation groove so as to adjust the relative position of the magnetic part (62) and a damping part (5).

8. A pressure controlled back pressure valve according to claim 6 or 7, wherein: the hydraulic valve is characterized in that a pressure sensor is arranged at the position of the liquid flow hole (15), the pressure sensor is used for sensing the sealing pressure of the valve plug (4), the back pressure valve further comprises a regulating processor, an installation cavity for the installation of the processor is arranged on the valve cap (2), a display (10) is arranged on the valve cap (2), a monitoring module and a regulating module are arranged in the regulating processor, a monitoring strategy is arranged in the monitoring module, the monitoring strategy comprises a model of a damping piece (5) and is used for acquiring the sealing pressure range, pressure data are formed and sent to the display (10) to be used for displaying the numerical value of the sealing pressure range, a regulating strategy is arranged in the regulating module, the regulating strategy comprises magnetic attraction force received by the regulating valve plug (6) and is displayed on the display (10), and a regulating signal is generated to control the regulating structure (7) to regulate the sealing pressure when the set sealing pressure is received.

9. A control method of a pressure-controlled back pressure valve, based on the pressure-controlled back pressure valve according to claim 8, characterized in that:

selecting a valve core (6), assembling the valve core (6) with a valve plug (4), placing a diaphragm piece (3) on the valve body (1), connecting the valve plug (4) with the diaphragm piece (3), sleeving a valve cap (2) and connecting the valve cap (2) with the valve body (1), so that an inner cavity (26) is separated to form a liquid flow cavity (16) and a valve control cavity (17) under the action of the diaphragm piece (3);

selecting a damping piece (5), and sleeving the damping piece (5) into a valve control cavity (17) along a valve core (6);

installing a pressure regulating structure (7) so that the pressure regulating structure (7) is used for regulating the relative position between the damping piece (5) and the valve core (6);

setting a sealing pressure on a display (10), adjusting the relative position between a damping piece (5) and a valve core (6) through a pressure adjusting structure (7), so that a pressure sensor senses the sealing pressure conducted by a valve plug (4) and displays the value of the sealing pressure on the display (10), and when the display (10) displays that the value of the sealing pressure is consistent with the preset value of the sealing pressure, controlling the pressure adjusting structure (7) to stop, wherein the magnetic attraction provided by the damping piece (5) is equal to the preset sealing pressure.

10. The control method of a pressure-controlled back pressure valve according to claim 9, characterized in that:

monitoring the closing pressure in real time when a fluid is detected at the fluid inlet (11) of the valve body (1);

monitoring the fluid pressure at the fluid inlet (11) and controlling the valve plug (4) to open the hydraulic orifice (15) in dependence of the monitored fluid pressure;

if the liquid flow hole (15) is opened after the closing pressure is not detected, or the liquid flow hole (15) is not opened after the closing pressure is detected, the regulating processor controls the pressure regulating structure (7) to correct and regulate the magnetic attraction force, so that the valve plug (4) is pushed to open the liquid flow hole (15) when the fluid pressure breaks through the closing pressure, and the valve core (6) is driven to move along the valve control cavity (17).