A high-precision and low-leakage safety valve

Abstract

The present invention discloses a high-precision and low-leakage safety valve, whose structure includes a safety valve body, an electromagnetic device inside the valve body, a power generation device inside the pipeline, a pressure switch and a magnetorheological fluid sealing device. The electromagnetic device uses electromagnetic force to drive the valve core to close quickly, eliminating the return delay; the power generation device inside the pipeline uses the kinetic energy of the pressure-relieving fluid to cut the magnetic induction lines to charge the capacitor, realizing self-power supply; the pressure switch monitors the pressure of the inlet pipeline in real time, triggering the standby, pressure-relieving and return control logics; the magnetorheological fluid sealing device adjusts the deformation of the magnetorheological fluid through the magnetic field, dynamically compensating the sealing gap to ensure excellent sealing effect. This safety valve has a simple structure, low energy consumption and stable operation, significantly reducing the leakage risk and being applicable to complex and harsh working conditions.

Description

Technical Field

[0001] This application relates to the technical field of valves, and specifically relates to a high-precision and low-leakage safety valve. Background Art

[0002] Spring-loaded safety valves are widely used in fields such as aerospace, nuclear power, and chemical engineering, mainly for overpressure protection of pressure systems. When the system pressure is too high, the spring-loaded safety valve can be opened in a timely manner to discharge the excess medium, so as to avoid catastrophic consequences such as the rupture of pressure vessels and pipelines; when the system pressure decreases, the spring-loaded safety valve is in a closed state, and the seal is achieved through the contact between the valve flap and the valve seat, thereby avoiding excessive pressure loss. Due to the influence of factors such as fluid force, when the system pressure is lower than the set pressure, the safety valve cannot close quickly, resulting in pressure loss. To improve the accuracy and sealing performance of the safety valve, it is necessary to accurately sense and quickly close the valve core when the system pressure decreases, and enhance its sealing performance to reduce leakage caused by damage to the sealing surface. Furthermore, the safety valve can respond quickly to reduce system pressure loss. At the same time, without human intervention and without affecting the normal operation of the safety valve, the pressure is automatically detected to achieve precise valve core closing and enhanced sealing. The present invention can achieve self-sufficiency in electric energy, does not require an external power supply, is suitable for the use scenario of safety valves in harsh and complex environments, and can improve the stability of the system. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a high-precision and low-leakage safety valve to solve the problems raised in the above background art.

[0004] According to one aspect of the present application, a high-precision and low-leakage safety valve includes a safety valve, an in-valve electromagnet device, an in-pipe power generation device, a pressure switch, and a magnetorheological fluid sealing device. The safety valve is the main body and the in-valve electromagnet device is installed inside it. The in-valve electromagnet device is used to forcibly drive the safety valve to close quickly through electromagnetic force to eliminate the return delay. The inlet position of the safety valve is fixedly connected to an inlet pipe, and the in-pipe power generation device is installed in the inlet pipe. The in-pipe power generation device is connected to a capacitor, and the in-pipe power generation device is used to cut magnetic induction lines by using the kinetic energy of the pressure-relieving fluid to generate electricity and charge the capacitor to achieve self-sufficiency of electric energy. A pressure switch is installed at a branch on one side of the inlet pipe. The pressure switch is electrically connected to the in-valve electromagnet device and the magnetorheological fluid sealing device respectively. The capacitor can provide electric energy for the in-valve electromagnet device and the magnetorheological fluid sealing device. The pressure switch is used to monitor the pressure of the inlet pipe and trigger the control logic of the three stages of the standby process, pressure-relieving process, and return process of the safety valve. One end of the magnetorheological fluid sealing device is connected to the inlet pipe in a communicating manner and the other end is connected to the safety valve in a communicating manner. The magnetorheological fluid sealing device is used to adjust the deformation of the magnetorheological fluid through a magnetic field to compensate for the sealing gap to achieve dynamic leakage sealing.

[0005] Preferably, the safety valve includes an upper valve cover, an adjusting nut, a connecting nut, a valve body, an upper gasket, a spring, a lower gasket, a valve core, a valve seat, a centering ball, and a valve flap. The upper end opening of the valve body is fixedly connected to the upper valve cover. A connecting nut is fixedly provided at the inner connection part of the valve body and the upper valve cover. The adjusting nut is fixedly provided in the middle of the connecting nut. A through hole is opened in the middle of the adjusting nut and the rod part of the valve core passes through the through hole. A spring is sleeved on the outer peripheral side of the rod part of the valve core. The upper and lower ends of the spring are respectively provided with an upper gasket and a lower gasket. The upper gasket abuts against the adjusting nut, and the lower gasket abuts against the head of the valve core. The in-valve electromagnet device is arranged at the position of the outer peripheral side of the rod part of the valve core inside the valve body. The valve core slides inside the valve body. A centering ball is embedded at the center of the head of the valve core. A valve flap is embedded at the head of the valve core below the centering ball. The lower end opening of the valve body is fixedly connected to the valve seat. The upper end opening of the valve seat abuts against the valve flap at the head of the valve core and is located at the pressure-relieving port of the valve body. The lower end opening of the valve seat is connected to the inlet pipe in a communicating manner. A magnetorheological fluid internal flow channel is also opened inside the valve seat. One end of the magnetorheological fluid internal flow channel is connected to the magnetorheological fluid sealing device in a communicating manner, and the other end of the magnetorheological fluid internal flow channel is connected to the contact part between the upper end of the valve seat and the valve flap in a communicating manner.

[0006] Preferably, the electromagnetic device inside the valve body includes an electromagnetic coil and a push magnet. The electromagnetic coil is sleeved on the upper position of the outer peripheral side of the valve core rod portion, and its upper end is fixedly connected to the connecting nut. The push magnet is sleeved on the lower position of the outer peripheral side of the valve core rod portion, and its lower end is fixedly connected to the lower washer. The same poles of the electromagnetic coil and the push magnet are arranged oppositely. The electromagnetic coil is electrically connected to the pressure switch, and the capacitor provides electrical energy for the electromagnetic coil.

[0007] Preferably, the in-pipe power generation device includes a rotating blade, a rotating magnet, a bearing, an in-pipe support, and a pipe-wrapped coil. The in-pipe support is horizontally and fixedly installed inside the inlet pipe. The rotating blade is rotatably installed on the in-pipe support through a bearing. A rotating magnet is fixedly provided at the central axis portion of the rotating blade. The rotating blade can drive the rotating magnet to rotate along its central axis. A pipe-wrapped coil is wound on the outer side wall of the inlet pipe at the position of the rotating magnet. The pipe-wrapped coil is connected to the capacitor.

[0008] Preferably, the magneto-fluid sealing device includes a sealing coil, a magneto-fluid pipe, a magneto-fluid storage tank, and a solenoid valve. The sealing coil is cooperatively connected with the valve seat. One end of the magneto-fluid pipe is connected to the inlet pipe in a communicating manner, and the other end of the magneto-fluid pipe is connected to the magneto-fluid inner flow path in a communicating manner. The magneto-fluid storage tank and the solenoid valve are respectively arranged on the magneto-fluid pipe, and the solenoid valve is installed at a position close to the magneto-fluid inner flow path. The magneto-fluid storage tank is provided with magneto-fluid. The solenoid valve and the sealing coil are electrically connected to the pressure switch, and the capacitor provides electrical energy for the solenoid valve and the sealing coil.

[0009] A working method of a high-precision and low-leakage safety valve includes a standby process, a pressure relief process, and a return process. The specific processes are as follows:

[0010] The standby process is as follows: Initially, the pressure switch is closed and the capacitor discharges. The valve flap is closely attached to the upper end of the valve seat. The inlet pipe is filled with pressure, and the magneto-fluid storage tank is pressurized through the magneto-fluid pipe. The solenoid valve is powered on and opened, and the magneto-fluid enters the magneto-fluid inner flow path of the valve seat. The sealing coil is powered on to deform the magneto-fluid, so that the valve core head forms a seal with the magneto-fluid.

[0011] The pressure relief process is as follows: When the pressure in the inlet pipe reaches the set pressure, the pressure switch disconnects, the valve core opens, the fluid in the inlet pipe flows, drives the rotating blade and the rotating magnet to rotate, the pipe-wrapped coil cuts the magnetic induction line to charge the capacitor, and the solenoid valve loses power and closes, so that the magneto-fluid in the magneto-fluid storage tank remains inside without loss.

[0012] The return process is as follows: The pressure in the inlet pipe is lower than the set pressure, the pressure switch closes and the capacitor discharges. The valve core rebounds slowly due to the resistance of the fluid force. The electromagnetic coil is energized to generate an electromagnetic force, which generates an electromagnetic repulsive force on the push magnet, thereby pushing the valve core downward to move, so that the valve flap quickly and tightly fits with the upper end of the valve seat. There is pressure in the inlet pipe and the magnetic fluid storage tank is pressurized. The solenoid valve is energized and opened, so that the magnetic fluid enters the inner flow path of the magnetic fluid. The sealing coil is energized to deform the magnetic fluid, so that a seal is formed between the valve core head and the magnetic fluid.

[0013] The advantages of this application compared with the prior art are as follows:

[0014] 1. By using the electromagnet device in the valve body and forcibly driving the valve core to close through electromagnetic force, the delay phenomenon in the return process of the traditional safety valve can be eliminated, so that the sealing state can be quickly restored when the system pressure decreases. At the same time, the magnetic fluid sealing device realizes the dynamic compensation of the sealing gap by regulating the deformation of the magnetic fluid through the magnetic field, ensuring an excellent sealing effect between the valve core head and the sealing medium and greatly reducing the leakage risk;

[0015] 2. The adopted in-pipe power generation device can utilize the kinetic energy of the pressure-relieving fluid to charge the capacitor by cutting the magnetic induction lines with the rotating blades and the rotating magnet, realizing self-supply of electric energy. This design not only eliminates the dependence on external power supplies, but also ensures the long-term stable operation of the safety valve in harsh and complex environments, further improving the reliability of the overall system;

[0016] 3. By setting a pressure switch, the control logic for three stages of standby, pressure relief and return is realized. The system can monitor the pressure change in the inlet pipe in real time, accurately judge the operating state and trigger corresponding actions, so that it can not only ensure rapid pressure release during overpressure, but also timely close the valve core when the pressure recovers, avoiding unnecessary energy loss or safety hazards caused by pressure fluctuations in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of a high-precision and low-leakage safety valve according to an embodiment of the present application.

[0018] Figure 2 is a schematic diagram of the internal structure of the safety valve body of a high-precision and low-leakage safety valve according to an embodiment of the present application.

[0019] Figure 3 is a schematic diagram of the internal structure of the electromagnet device in the valve body of a high-precision and low-leakage safety valve according to an embodiment of the present application.

[0020] Figure 4It is a schematic internal structure diagram of a power generation device inside a pipeline of a high-precision and low-leakage safety valve according to an embodiment of the present application.

[0021] Figure 5 It is a perspective view of a power generation device inside a pipeline of a high-precision and low-leakage safety valve according to an embodiment of the present application.

[0022] Figure 6 It is a schematic internal structure diagram of a magneto-fluid sealing device of a high-precision and low-leakage safety valve according to an embodiment of the present application.

[0023] Reference numerals: 1, safety valve; 101, upper valve cover; 102, adjusting nut; 103, connecting nut; 104, valve body; 105, upper gasket; 106, spring; 107, lower gasket; 108, valve core; 109, valve seat; 110, centering ball; 111, valve flap; 2, electromagnet device inside the valve body; 21, electromagnetic coil; 22, push magnet; 3, power generation device inside the pipeline; 31, inlet pipeline; 32, rotating blade; 33, rotating magnet; 34, bearing; 35, support inside the pipeline; 36, pipeline-wrapping coil; 4, pressure switch; 5, magneto-fluid sealing device; 51, sealing coil; 52, magneto-fluid pipeline; 53, magneto-fluid storage tank; 54, solenoid valve. Detailed implementation manners

[0024] In order to make the content of the present application easier to be clearly understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the Figure 1 accompanying drawings, and the words "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0025] As Figures 1 to 6As shown in the figure, a high-precision and low-leakage safety valve includes a safety valve 1, an electromagnetic device 2 inside the valve body, a power generation device 3 inside the pipeline, an inlet pipeline 31, a pressure switch 4, and a magnetorheological fluid sealing device 5; the electromagnetic device 2 inside the valve body is used to forcibly drive the safety valve 1 to close quickly through electromagnetic force to eliminate the return delay; the power generation device 3 inside the pipeline is used to cut the magnetic induction lines by the kinetic energy of the pressure-relieving fluid to generate electricity and charge a capacitor to achieve self-supply of electrical energy; the pressure switch 4 is used to monitor the pressure of the inlet pipeline 31 and trigger the control logic of the three stages of the standby process, pressure-relieving process, and return process of the safety valve 1; the magnetorheological fluid sealing device 5 is used to compensate the sealing gap by regulating the deformation of the magnetorheological fluid through a magnetic field to achieve dynamic leakage sealing; among them, the safety valve 1 includes an upper valve cover 101, an adjusting nut 102, a connecting nut 103, a valve body 104, an upper gasket 105, a spring 106, a lower gasket 107, a valve core 108, a valve seat 109, a centering ball 110, and a valve flap 111; the electromagnetic device 2 inside the valve body includes an electromagnetic coil 21 and a push magnet 22; the power generation device 3 inside the pipeline includes a rotating blade 32, a rotating magnet 33, a bearing 34, a support 35 inside the pipeline, and a pipeline-wrapped coil 36; the magnetorheological fluid sealing device 5 includes a sealing coil 51, a magnetorheological fluid pipeline 52, a magnetorheological fluid storage tank 53, and a solenoid valve 54.

[0026] Specifically, the upper end opening of the valve body 104 is fixedly connected to the upper valve cover 101. A connecting nut 103 is fixedly provided at the inner connection part of the valve body 104 and the upper valve cover 101. An adjusting nut 102 is fixedly provided in the middle of the connecting nut 103. A through hole is provided in the middle of the adjusting nut 102, and the rod part of the valve core 108 passes through the through hole. A spring 106 is sleeved on the outer peripheral side of the rod part of the valve core 108. Upper and lower washers 105 and 107 are respectively arranged at the upper and lower ends of the spring 106. The upper washer 105 abuts against the adjusting nut 102, and the lower washer 107 abuts against the head of the valve core 108. The electromagnetic coil 21 is sleeved at a position near the upper part of the outer peripheral side of the rod part of the valve core 108, and its upper end is fixedly connected to the connecting nut 103. The push magnet 22 is sleeved at a position near the lower part of the outer peripheral side of the rod part of the valve core 108, and its lower end is fixedly connected to the lower washer 107. The electromagnetic coil 21 and the push magnet 22 are arranged with the same poles facing each other, so that after the electromagnetic coil 21 is energized to generate electromagnetic force, an electromagnetic repulsive force is generated with the push magnet 22, thereby pushing the valve core 108 downward to make the valve flap 111 quickly and tightly fit against the upper end of the valve seat 109. The valve core 108 slides in the valve body 104. A centering ball 110 is embedded at the center of the head of the valve core 108. A valve flap 111 is embedded at the head of the valve core 108 below the centering ball 110. The lower end opening of the valve body 104 is fixedly connected to the valve seat 109. The upper end opening of the valve seat 109 abuts against the valve flap 111 at the head of the valve core 108 and is located at the pressure relief port of the valve body 104. The lower end opening of the valve seat 109 is connected to the inlet pipe 31 in a communicating manner. An in-pipe bracket 35 is horizontally and fixedly installed inside the inlet pipe 31. A rotating blade 32 is rotatably installed on the in-pipe bracket 35 through a bearing 34. A rotating magnet 33 is fixedly provided at the central axis part of the rotating blade 32, and their central axes coincide. The rotating blade 32 can drive the rotating magnet 33 to rotate along its central axis. A pipe-wrapping coil 36 is wound on the outer side wall of the inlet pipe 31 at the position of the rotating magnet 33. The pipe-wrapping coil 36 is connected to a capacitor. In a specific implementation, when the pressure in the inlet pipe 31 reaches the set pressure, the valve core 108 of the safety valve 1 opens, and the fluid in the inlet pipe 31 flows, thereby driving the rotating blade 32 and the rotating magnet 33 to rotate, so that the magnetic field generated by the rotating magnet 33 rotates, and then the pipe-wrapping coil 36 cuts the magnetic induction line, making the coil generate an induced electromotive force to charge the capacitor. A magnetic fluid internal flow channel is also provided inside the valve seat 109. One end of the magnetic fluid internal flow channel is connected to one end of the magnetic fluid pipe 52 in a communicating manner. The other end of the magnetic fluid internal flow channel is connected to the contact part between the upper end of the valve seat 109 and the valve flap 111. The other end of the magnetic fluid pipe 52 is connected to the inlet pipe 31 in a communicating manner. A magnetic fluid storage tank 53 and a solenoid valve 54 are respectively arranged on the magnetic fluid pipe 52, and the solenoid valve 54 is installed at a position close to the magnetic fluid internal flow channel. A magnetic fluid is provided in the magnetic fluid storage tank 53. The sealing coil 51 is connected to the valve seat 109 in a matching manner;A pressure switch 4 is installed at a branch on one side of the inlet pipe 31. The electromagnetic coil 21, the solenoid valve 54, and the sealing coil 51 are electrically connected to the pressure switch 4 respectively. The capacitor supplies electrical energy to the electromagnetic coil 21, the solenoid valve 54, and the sealing coil 51.

[0027] A working method of a high-precision and low-leakage safety valve includes a standby process, a pressure relief process, and a return process. The specific processes are as follows:

[0028] The standby process is as follows: Initially, the pressure switch 4 is in a closed state and the capacitor discharges. The valve flap 111 is in close contact with the upper end of the valve seat 109. The inlet pipe 31 is filled with pressure and pressurizes the magnetic fluid storage tank 53 through the magnetic fluid pipe 52. The solenoid valve 54 is energized and opened by the discharge of the capacitor. The magnetic fluid enters the inner flow channel of the magnetic fluid in the valve seat 109 through the magnetic fluid pipe 52. And the sealing coil 51 is energized by the discharge of the capacitor, so that the magnetic fluid in the inner flow channel of the magnetic fluid deforms, so that the head of the valve core 108 forms a seal with the magnetic fluid. At this time, there is no fluid flow in the inlet pipe 31, and the rotating blades 32 and the rotating magnets 33 in the in-pipe power generation device 3 are stationary;

[0029] The pressure relief process is as follows: When the pressure in the inlet pipe 31 reaches the set pressure, the pressure switch 4 is in an open state, the valve core 108 of the safety valve 1 opens, the fluid in the inlet pipe 31 flows, driving the rotating blades 32 and the rotating magnets 33 to rotate. Thus, the pipe-wrapped coil 36 cuts the magnetic induction line to charge the capacitor. Since the pressure switch 4 is in an open state, the capacitor does not discharge, and the solenoid valve 54 of the magnetic fluid sealing device 5 loses power and closes. Thus, the magnetic fluid in the magnetic fluid storage tank 53 remains inside without loss;

[0030] The return process is as follows: When the pressure in the inlet pipe 31 is lower than the set pressure, the pressure switch (4) closes and the capacitor discharges. The valve core 108 in the safety valve 1 is not rebounded in time under the influence of the fluid force, the valve flap 111 is not in contact with the upper end of the valve seat 109, and the electromagnetic coil 21 in the inner electromagnet device 2 in the valve body is energized to generate an electromagnetic force, generating an electromagnetic repulsive force on the pushing magnet 22, so as to push the valve core 108 to move downward, so that the valve flap 111 is quickly and closely attached to the upper end of the valve seat 109. At this time, there is pressure in the inlet pipe 31 and the magnetic fluid storage tank 53 is pressurized through the magnetic fluid pipe 52. The solenoid valve 54 is energized and opened by the discharge of the capacitor, so that the magnetic fluid enters the inner flow channel of the magnetic fluid in the valve seat 109, and the sealing coil 51 is energized to make the magnetic fluid in the inner flow channel of the magnetic fluid deform, so that the head of the valve core 108 forms a seal with the magnetic fluid.

[0031] In one embodiment, the working method of the safety valve further includes a magnetic fluid sealing and pressure resistance method, an in-pipe flow force power generation method, and an inner electromagnet magnetic fluid compensation and automatic opening method, which are specifically as follows:

[0032] Magnetic fluid sealing pressure resistance method: Under normal circumstances, the solenoid valve 54 is de-energized and closed. The magnetic fluid in the magnetic fluid storage tank 53 cannot be compensated by gas pressure. When the solenoid valve 54 is energized and opened, the gas pressure compensates the magnetic fluid; at the same time, the valve core 108 closes, and the sealing coil 51 on the valve seat 109 is energized. The magnetic fluid in the internal flow channel of the magnetic fluid is deformed by the electromagnetic force, so as to achieve the sealing effect;

[0033] The relationship between the magnetic fluid sealing pressure resistance and the pressure difference inside and outside the valve seat 109 is as follows:

[0034]

[0035] Among them, is the fluid pressure difference, is the magnetic permeability, H is the magnetic field strength, and M is the magnetization intensity;

[0036] Ignoring the influence of external forces and its own surface tension on the magnetic liquid, and not considering its internal degrees of freedom and assuming that the magnetic liquid is an incompressible liquid, the magnetic fluid sealing pressure resistance formula is obtained from the fluid motion equation and the Bernoulli equation as follows:

[0037]

[0038] Among them, is the saturation magnetization intensity of the magnetic liquid, and are the maximum and minimum magnetic flux densities at the boundary of the magnetic liquid respectively.

[0039] In-pipe flow force power generation method: The gas in the inlet pipe 31 drives the rotating blade 32 to rotate at an angular velocity ω. The rotating magnet 33 is fixed on the rotating blade 32, and the pipe-wrapping coil 36 is wrapped around the inlet pipe 31. Since the rotating magnet 33 rotates, the magnetic field rotates, causing the pipe-wrapping coil 36 to cut the magnetic induction line, so that the pipe-wrapping coil 36 generates an induced electromotive force to charge the capacitor;

[0040] The relationship between the rotor angular velocity ω and the fluid flow rate q is as follows:

[0041]

[0042] Among them, r is the average radius of the rotating blade 32, α is the angle between the rotating blade 32 and the axis, c is a constant, and A is the flow cross-sectional area of the rotating blade 32. At this time, the electromotive force is:

[0043]

[0044] Among them, is the peak value of the induced electromotive force, n is the number of turns of the coil, B is the magnetic induction intensity, S is the coil area, and ω is the angular velocity of the rotor rotation.

[0045] Automatic opening method for internal electromagnet magnetohydrodynamic compensation: Under normal circumstances, the pressure switch 4 is closed, the air flow in the inlet pipe 31 flows, the power generation device 3 in the pipe generates electricity, and the capacitor is charged; when the pressure in the inlet pipe 31 reaches the set pressure, the pressure switch 4 is disconnected; when the pressure in the inlet pipe 31 is lower than the set pressure, the pressure switch 4 is closed, causing the capacitor to discharge, so that the electromagnetic coil 21, the solenoid valve 54, and the sealing coil 51 are energized, and the valve core 108 receives a downward thrust, causing the valve flap 111 to close; the solenoid valve 54 opens, and the magnetohydrodynamic is replenished; the sealing coil 51 is energized to apply a force to the magnetohydrodynamic in the magnetohydrodynamic flow channel to deform it, thereby playing a sealing role.

[0046] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, and are not intended to limit them. Although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that without departing from the spirit and scope defined by the claims of the present application, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features.

Claims

1. A high-precision low-leakage safety valve, characterized in that: The invention comprises a safety valve (1), an electromagnet device (2) in a valve body, an in-pipe power generation device (3), a pressure switch (4) and a magnetic fluid sealing device (5), wherein the safety valve (1) is a main body and the electromagnet device (2) in the valve body is installed therein, an inlet pipe (31) is fixedly connected to the inlet position of the safety valve (1), the in-pipe power generation device (3) is installed in the inlet pipe (31), the in-pipe power generation device (3) is connected to a capacitor, a pressure switch (4) is installed at a branch on one side of the inlet pipe (31), the pressure switch (4) is electrically connected to the electromagnet device (2) in the valve body and the magnetic fluid sealing device (5) respectively, the capacitor provides electric energy to the electromagnet device (2) in the valve body and the magnetic fluid sealing device (5), one end of the magnetic fluid sealing device (5) is connected to the inlet pipe (31) and the other end is connected to the safety valve (1); The safety valve (1) comprises an upper valve cover (101), an adjusting nut (102), a connecting nut (103), a valve body (104), an upper gasket (105), a spring (106), a lower gasket (107), a valve core (108), a valve seat (109), a centering ball (110) and a valve flap (111); an upper opening of the valve body (104) is fixedly connected to the upper valve cover (101); a connecting nut is fixedly provided at the connection between the inner side of the valve body (104) and the inner side of the upper valve cover (101). (103), an adjusting nut (102) is fixedly arranged in the middle of the connecting nut (103), a through hole is opened in the middle of the adjusting nut (102) and the stem of the valve core (108) passes through the through hole, and a spring (106) is sleeved on the outer peripheral side of the stem of the valve core (108), and an upper washer (105) and a lower washer (107) are respectively arranged at the upper and lower ends of the spring (106), and the upper washer (105) is in conflict with the adjusting nut (102), and the lower washer (107) is in conflict with the valve core (108). The electromagnet device (2) in the valve body is arranged at the outer peripheral side of the stem of the valve core (108) in the valve body (104); the valve core (108) is slidably arranged in the valve body (104); a centering ball (110) is embedded in the center of the head of the valve core (108); a valve flap (111) is embedded in the head of the valve core (108) below the centering ball (110); the lower end opening of the valve body (104) is fixedly connected to the valve seat (109); The upper opening of the valve seat (109) contacts the valve flap (111) at the head of the valve core (108) and is located at the pressure relief port of the valve body (104); the lower opening of the valve seat (109) is connected to the inlet pipe (31); a magnetic fluid inner flow channel is also provided inside the valve seat (109); one end of the magnetic fluid inner flow channel is connected to the magnetic fluid sealing device (5); and the other end of the magnetic fluid inner flow channel is connected to the contact point between the upper end of the valve seat (109) and the valve flap (111).

2. A high-precision low-leakage safety valve according to claim 1, characterized in that: The electromagnet device (2) in the valve body comprises an electromagnetic coil (21) and a pushing magnet (22), wherein the electromagnetic coil (21) is sleeved on the upper position of the outer peripheral side of the stem of the valve core (108) and its upper end is fixedly connected to the connecting nut (103), and the pushing magnet (22) is sleeved on the lower position of the outer peripheral side of the stem of the valve core (108) and its lower end is fixedly connected to the lower gasket (107), and the same poles of the electromagnetic coil (21) and the pushing magnet (22) are arranged opposite to each other, the electromagnetic coil (21) is electrically connected to the pressure switch (4), and the capacitor provides electrical energy to the electromagnetic coil (21).

3. A high-precision low-leakage safety valve according to claim 2, characterized in that: The in-pipe power generation device (3) comprises a rotating blade (32), a rotating magnet (33), a bearing (34), an in-pipe support (35) and a pipe wrapping coil (36); the in-pipe support (35) is horizontally fixedly installed inside the inlet pipe (31); the rotating blade (32) is rotatably installed on the in-pipe support (35) via the bearing (34); a rotating magnet (33) is fixedly installed on the central axis of the rotating blade (32); the rotating blade (32) can drive the rotating magnet (33) to rotate along its central axis; a pipe wrapping coil (36) is wound around the outer wall of the inlet pipe (31) at the position of the rotating magnet (33); and the pipe wrapping coil (36) is connected to the capacitor.

4. A high-precision low-leakage safety valve according to claim 3, characterized in that: The magnetic fluid sealing device (5) comprises a sealing coil (51), a magnetic fluid pipeline (52), a magnetic fluid storage tank (53) and a solenoid valve (54); the sealing coil (51) is cooperatively connected to the valve seat (109); one end of the magnetic fluid pipeline (52) is connected to the inlet pipeline (31); the other end of the magnetic fluid pipeline (52) is connected to the inner flow channel of the magnetic fluid; the magnetic fluid storage tank (53) and the solenoid valve (54) are respectively arranged on the magnetic fluid pipeline (52); the solenoid valve (54) is installed at a position close to the inner flow channel of the magnetic fluid; the magnetic fluid storage tank (53) contains magnetic fluid; the solenoid valve (54) and the sealing coil (51) are electrically connected to the pressure switch (4); and the capacitor provides electrical energy to the solenoid valve (54) and the sealing coil (51).

5. A method for operating a high-precision low-leakage safety valve according to claim 4, characterized in that: It includes the standby process, pressure relief process and return process. The specific process is as follows: The standby process is as follows: initially, the pressure switch (4) is closed and the capacitor is discharged, the valve flap (111) is tightly fitted to the upper end of the valve seat (109), the inlet pipe (31) is filled with pressure and the magnetic fluid storage tank (53) is pressurized through the magnetic fluid pipe (52), the solenoid valve (54) is energized to open, the magnetic fluid enters the magnetic fluid flow channel of the valve seat (109), the sealing coil (51) is energized to deform the magnetic fluid, so that the head of the valve core (108) forms a seal with the magnetic fluid; The pressure relief process is as follows: when the pressure in the inlet pipe (31) reaches the set pressure, the pressure switch (4) is disconnected, the valve core (108) is opened, the fluid in the inlet pipe (31) flows, driving the rotating blades (32) and the rotating magnet (33) to rotate, the pipe wraps the coil (36) to cut the magnetic flux lines to charge the capacitor, and the solenoid valve (54) loses power and closes, so that the magnetic fluid in the magnetic fluid storage tank (53) is kept inside without loss; The return process is as follows: the pressure in the inlet pipe (31) is lower than the set pressure, the pressure switch (4) is closed and the capacitor is discharged, the valve core (108) is hindered by the fluid force and rebounds slowly, the electromagnetic coil (21) is energized to generate electromagnetic force, and an electromagnetic repulsive force is generated on the pushing magnet (22), thereby pushing the valve core (108) to move downward, so that the valve flap (111) and the upper end of the valve seat (109) are quickly and tightly fitted, the inlet pipe (31) has pressure and pressurizes the magnetic fluid storage tank (53), the electromagnetic valve (54) is energized to open, so that the magnetic fluid enters the magnetic fluid flow channel, the sealing coil (51) is energized to deform the magnetic fluid, so that the head of the valve core (108) and the magnetic fluid form a seal.

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