Fault state automatic monitoring and self-repairing voltage regulator and its fault determination method

Abstract

The present invention discloses a voltage regulator with automatic fault status monitoring and self-repairing function, which relates to the technical field of voltage regulators for gas pipelines. The present invention monitors the pressure difference between the upper cavity and the lower cavity of the diaphragm through a differential pressure transmitter, monitors the displacement of the valve stem through a displacement transmitter, monitors the outlet pressure through a pressure transmitter, and monitors the operating parameters of the voltage regulator in real time. By the changes in some operating parameters of the voltage regulator, the type of fault and the faulty component are judged. At the same time, for faults such as diaphragm rupture and sealing valve flap detachment, self-repairing methods are provided to avoid accidents of equipment shutdown caused by the voltage regulator shutting down due to faults, and reduce the problem of reducing the safety of natural gas pipeline transportation.

Description

Technical Field

[0001] The present invention relates to the technical field of gas pipeline regulators, and more specifically to a regulator with automatic fault monitoring and self-repairing functions. Background Art

[0002] The pressure control system of a natural gas transmission station mainly consists of a safety shut-off valve, a monitoring regulator, and a working regulator. The valve body of the working regulator is connected to the pipeline behind the monitoring regulator through a flange. The pre-stage and control pilot on the valve body are connected to the pipeline after working pressure regulation through a pressure guiding signal conduit, receiving the downstream feedback control pressure, controlling the valve opening of the regulator, and controlling the downstream pressure within the set range, so as to provide a stable natural gas transmission pressure of "working set value" for the downstream pipeline gas supply pressure during normal operation.

[0003] For example, in the utility model patent with the publication date of March 15, 2022, the publication number of CN216046895U, and the name of "Manual and Automatic Integrated Intelligent Self-acting Regulator System", this utility model patent includes a regulation component, a pressure regulation control cabinet, an outlet section pressure transmitter, a main regulator, and a pilot. The regulation component is respectively connected to the solenoid valve and the pressure transmitter in the pressure regulation control cabinet, and is used to collect the pressure value of the pressure transmitter and control the on-off of the solenoid valve in the pressure regulation control cabinet. This application optimizes the inlet pipeline and the pressure relief pipeline in the pressure regulation control cabinet, so that the regulation component can realize the gear change to adjust the pressure regulation range of the regulator and achieve one-key regulation.

[0004] Currently, the regulators applied to gas pipelines do not have the functions of fault monitoring and self-repairing. When a fault occurs in the regulator, such as a diaphragm rupture, a sealing valve flap falling off, etc., in order to prevent the leakage of the transported medium and pressure out of control, the regulator can only be cut off. When a fault occurs and the regulator is closed, it will cause an accident of equipment shutdown, reducing the safety of natural gas pipeline transportation.

[0005] After a fault occurs in the above-mentioned type of regulator, it is impossible to distinguish the type of fault, and it is not clear which component fails to cause the regulator to shut down and stop transportation. Generally, it is necessary for workers to disassemble and check each component one by one before they can find out, which brings great difficulties to the fault troubleshooting of the regulator, takes a long time, and greatly affects the transportation of natural gas. Summary of the Invention

[0006] In order to overcome the defects and deficiencies existing in the above-mentioned prior art, the present invention provides a voltage regulator with automatic fault status monitoring and self-repairing function. The object of the present invention is to solve the problems in the above-mentioned prior art that the voltage regulator cannot monitor the fault status of the voltage regulator, cannot judge the faulty components through the operating parameters of the voltage regulator, resulting in accidents of equipment shutdown after a fault occurs, and reducing the safety of natural gas pipeline transportation. The voltage regulator of the present invention monitors the pressure difference between the upper chamber and the lower chamber of the diaphragm through a differential pressure transmitter, monitors the displacement of the valve stem through a displacement transmitter, monitors the outlet pressure through a pressure transmitter, and monitors the operating parameters of the voltage regulator in real time. By changing some operating parameters of the voltage regulator, the type of fault and the faulty components are judged. At the same time, for faults such as diaphragm rupture and sealing valve flap detachment, self-repairing methods are provided to avoid accidents of equipment shutdown caused by the voltage regulator shutting down due to faults, and reduce the problems of reducing the safety of natural gas pipeline transportation.

[0007] In order to solve the problems existing in the above-mentioned prior art, the present invention is realized through the following technical solutions.

[0008] The present invention provides a voltage regulator with automatic fault status monitoring and self-repairing function, and the voltage regulator includes

[0009] A differential pressure transmitter for monitoring the change of the pressure difference between the upper chamber and the lower chamber of the diaphragm;

[0010] A displacement transmitter for monitoring the displacement of the valve stem;

[0011] A pressure transmitter for monitoring the pressure of the medium at the outlet of the voltage regulator;

[0012] A vibration sensor for monitoring the vibration parameters of the voltage regulator;

[0013] A central processing unit that is respectively connected to the differential pressure transmitter, the displacement transmitter, the pressure transmitter and the vibration sensor, and real-time receives the parameter data transmitted by the differential pressure transmitter, the displacement transmitter, the pressure transmitter and the vibration sensor, and judges the fault status based on the received parameter data;

[0014] The diaphragm assembly of the voltage regulator includes a diaphragm and a recovery tray. The recovery tray is slidably and sealedly assembled on the upper membrane cover of the voltage regulator, and the diaphragm is fixed between the upper membrane cover and the lower membrane cover; both the diaphragm and the recovery tray are fixedly assembled with the valve stem; a cavity Ⅰ is formed between the recovery tray and the diaphragm, and a diaphragm upper chamber is formed by the cooperation of the recovery tray and the upper membrane cover; a recovery hole communicating the diaphragm upper chamber and the cavity Ⅰ is provided on the recovery tray, and a one-way valve assembly for preventing the pressure in the cavity Ⅰ from flowing to the diaphragm upper chamber is assembled on the recovery hole;

[0015] A sealing valve flap is arranged on the valve seat of the pressure regulator, and a sealing valve port that cooperates with the sealing valve flap to form a sealing pair is arranged at the bottom of the valve core; a recovery valve port is formed on the outer edge of the top of the valve seat, and the recovery valve port cooperates with the inner edge surface of the sealing valve port at the bottom of the valve core to form a recovery sealing pair; when the sealing valve flap is in a normal state, after the sealing port is sealed with the sealing valve flap, there is a set interval between the recovery valve port and the recovery valve port at the bottom of the valve core.

[0016] In the present invention, the central processing unit collects various operating parameters of the pressure regulator, continuously improves various data in its storage data path, and can perform self-learning according to the operating parameters during the normal operation of the pressure regulator.

[0017] The central processing unit collects the moving speed and distance of the valve stem during the normal use of the pressure regulator through a displacement transmitter, and collects the speed of change and the high and low values of the change of the outlet pressure of the pressure regulator during the normal use of the pressure regulator through a pressure transmitter, and forms a pressure curve. When the central processing unit monitors through the displacement transmitter that the moving speed of the valve stem suddenly stops or moves rapidly, and at the same time the central processing unit monitors through the pressure transmitter that the outlet pressure fluctuation of the pressure regulator exceeds the normal range, it proves that a jamming fault has occurred in the valve core.

[0018] The central processing unit collects the pressure difference between the upper chamber and the lower chamber of the diaphragm during the normal operation of the pressure regulator through a differential pressure transmitter. During the normal operation of the pressure regulator, the pressure difference value between the upper chamber and the lower chamber of the diaphragm will not exceed a value, and there will be a pressure difference value (that is, there is a pressure difference); when the displacement transmitter monitors that the position of the valve stem is at the lowest value, the pressure difference value will be in a state of 0. When the pressure regulator is operating normally, if the pressure difference between the upper chamber and the lower chamber of the diaphragm suddenly decreases and the position of the valve stem is not at the lowest value, it proves that the diaphragm is broken.

[0019] After the diaphragm ruptures, the lower chamber of the diaphragm communicates with chamber I, and the pressure in the lower chamber of the diaphragm acts on the check valve of the recovery tray. The check valve cuts off the recovery hole between chamber I and the upper chamber of the diaphragm. At this time, the function of the diaphragm will be replaced by the recovery tray, the fault is eliminated, and the pressure regulator automatically resumes operation.

[0020] The central processing unit collects the vibration parameters of the pressure regulator and the gas through a vibration sensor. The vibration parameters include vibration frequency and amplitude; when the vibration frequency increases or decreases, combined with the change of the position of the valve stem monitored by the displacement transmitter and the change of the outlet pressure of the pressure regulator monitored by the pressure transmitter, it can be judged whether the pressure regulator is in a fault state.

[0021] When the sealing valve flap is damaged or falls off, the valve core and the valve stem will continue to move downward until the valve core restores the sealing point, that is, when the restoring valve port formed by the outer edge of the top of the valve seat cooperates with the inner edge surface of the sealing valve port at the bottom of the valve core to form a restoring sealing pair, secondary sealing is achieved, and the working state of the pressure regulator is restored to automatically eliminate the fault. Since the stroke of the valve stem increases, the displacement transmitter monitors that the position of the valve stem is below the lowest value and gives a fault diagnosis result.

[0022] In order to better achieve the invention object of the present invention, it further has the following technical features:

[0023] An assembly groove for assembling the one-way valve assembly is provided on the restoring tray, and the restoring hole communicates with the bottom of the assembly groove and the cavity Ⅰ.

[0024] Furthermore, the one-way valve assembly includes a one-way valve seat, a steel ball and a spring. The one-way valve seat is assembled on the assembly groove, the steel ball is placed in the assembly groove, and the spring is arranged between the steel ball and the bottom of the assembly groove. Through the structure of the one-way valve assembly, when the diaphragm ruptures, the pressure in the lower cavity of the diaphragm enters the cavity Ⅰ, and the pressure in the lower cavity of the diaphragm acts on the steel ball through the restoring hole. Under the action of the spring and the pressure in the lower cavity of the diaphragm, the steel ball is blocked on the one-way valve seat to prevent the pressure in the lower cavity of the diaphragm from entering the upper cavity of the diaphragm. When the steel ball blocks the one-way valve seat, the restoring tray replaces the ruptured diaphragm, and the pressure regulator automatically resumes operation.

[0025] Meanwhile, when the diaphragm works normally (without rupture), the pressure in the upper cavity of the diaphragm acts on the steel ball, and together with the self-weight of the steel ball, the spring is compressed, causing the steel ball to leave the one-way valve seat. The restoring hole communicates the upper cavity of the diaphragm with the cavity Ⅰ, and the pressure in the upper cavity of the diaphragm enters the cavity Ⅰ and acts on the diaphragm.

[0026] Furthermore, one end of the restoring hole communicating with the assembly groove protrudes from the bottom of the assembly groove. The protruding amount of this protruding part should be greater than the height when the spring is compressed to the maximum, so that the steel ball can cooperate with this protruding hole position to block this hole position, avoiding the sudden increase of the pressure in the upper cavity of the diaphragm and entering the cavity Ⅰ to damage the diaphragm.

[0027] The sealing valve port is formed by the outer edge of the valve core protruding from the bottom of the valve core. A slope is formed between the inner edge of the outer edge of the valve core and the bottom of the valve core, and this slope is the inner edge surface of the sealing valve port.

[0028] The restoring valve port is formed by the outer edge of the valve seat protruding from the sealing valve flap. The outer edge of the valve seat has an inverted conical structure, and the outer edge of the valve seat cooperates with the slope of the inner edge of the sealing valve port to form a hard sealing pair.

[0029] The vibration sensor is assembled on the top of the pressure regulator.

[0030] The displacement transmitter is assembled on the upper diaphragm cover of the pressure regulator. The acquisition rod of the displacement transmitter is inserted into the upper cavity of the diaphragm through the upper diaphragm cover and is connected to the recovery tray.

[0031] The pressure transmitter is arranged on the connecting pipeline between the upper cavity of the diaphragm and the pipeline downstream of the outlet of the pressure regulator.

[0032] The second aspect of the present invention provides a fault determination method for a fault state automatic monitoring and self-repairing pressure regulator, and the method includes

[0033] The central processing unit collects the moving speed and distance of the valve stem during the normal use of the pressure regulator in real time through the displacement transmitter and stores them;

[0034] The central processing unit collects the change of the outlet pressure of the pressure regulator during the normal use of the pressure regulator in real time through the pressure transmitter, forms a pressure curve and stores it;

[0035] The central processing unit collects the change of the pressure difference between the upper cavity and the lower cavity of the diaphragm during the normal operation of the pressure regulator in real time through the differential pressure transmitter and stores it;

[0036] The central processing unit collects the vibration parameters during the normal operation of the pressure regulator in real time through the vibration sensor and stores them;

[0037] When the central processing unit monitors that the moving speed of the valve stem suddenly stops or moves rapidly through the displacement transmitter, and at the same time the central processing unit monitors that the fluctuation of the outlet pressure of the pressure regulator exceeds the normal range through the pressure transmitter, it indicates that a stuck valve core fault occurs;

[0038] When the central processing unit monitors that the pressure difference value between the upper cavity and the lower cavity of the diaphragm suddenly decreases through the differential pressure transmitter, and at the same time the central processing unit monitors that the valve stem is not in the lowest position through the displacement transmitter, it indicates that a diaphragm rupture fault occurs;

[0039] When the central processing unit monitors that the position of the valve stem is below the lowest value through the displacement transmitter, it indicates that a damage or detachment fault of the sealing valve flap occurs;

[0040] When the central processing unit monitors that the change of the vibration parameters of the pressure regulator exceeds the normal range through the vibration sensor, and then in combination with the change of the valve stem position monitored by the displacement transmitter and the change of the outlet pressure of the pressure regulator monitored by the pressure transmitter, it is judged whether the pressure regulator is in a fault state.

[0041] Compared with the prior art, the beneficial technical effects brought by the present invention are shown in:

[0042] 1. The pressure regulator of the present invention monitors the pressure difference between the upper cavity and the lower cavity of the diaphragm through a differential pressure transmitter, monitors the displacement of the valve stem through a displacement transmitter, monitors the outlet pressure through a pressure transmitter, and monitors the operating parameters of the pressure regulator in real time. The fault type and faulty components are determined by the changes in some operating parameters of the pressure regulator. At the same time, a self-repair method is provided for faults such as diaphragm rupture and sealing valve disc detachment, thereby avoiding accidents of equipment shutdown caused by the closure of the pressure regulator due to faults, and reducing the safety of natural gas transportation through pipelines.

[0043] 2. When the vibration parameter change of the voltage regulator exceeds the normal range monitored by the vibration sensor, the present invention determines whether the voltage regulator is in a fault state by combining the change of the valve stem position monitored by the displacement transmitter and the change of the outlet pressure of the voltage regulator monitored by the pressure transmitter. Through the determination of the fault state, it is concluded whether the fault is self-repaired.

[0044] 3. The fault status automatic monitoring and self-repairing voltage regulator of the present invention can determine and record the fault type and the faulty component when a fault occurs, and can complete self-repair at the same time without affecting the normal operation of the equipment. When the equipment is under maintenance, the fault can be repaired once and for all.

[0045] 4. The central processing unit of the present invention collects the operating parameters of the voltage regulator in normal working state, performs data self-learning and storage, and once a monitored operating parameter exceeds the fluctuation range of the voltage regulator in normal working state, a fault judgment can be made. Compared with the method of setting a fixed threshold, this method makes the fault judgment of the voltage regulator more flexible and changeable, avoiding the situation where a certain operating parameter exceeds the fixed threshold due to special circumstances and causing misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of the self-repairing voltage regulator of the present invention;

[0047] Figure 2 It is a structural schematic diagram of a one-way valve assembly in the self-repairing pressure regulator of the present invention;

[0048] Figure 3 It is a schematic diagram of the secondary sealing structure of the valve core and the valve seat in the self-repairing pressure regulator of the present invention;

[0049] Reference numerals: 1, upper chamber of diaphragm; 2, lower chamber of diaphragm; 3, differential pressure transmitter; 4, valve stem; 5, displacement transmitter; 6, regulator outlet; 7, pressure transmitter; 8, vibration sensor; 9, central processing unit; 10, diaphragm; 11, recovery tray; 12, upper membrane cover; 13, lower membrane cover; 14, chamber I; 15, recovery hole; 16, check valve assembly; 17, valve seat; 18, valve core; 19, sealing valve flap; 20, sealing valve port; 21, recovery valve port; 22, inner edge surface of sealing valve port; 23, assembly groove; 24, check valve seat; 25, steel ball; 26, spring; 27, connecting pipeline. Detailed implementation manners

[0050] The technical solutions of the present invention will be further elaborated in detail below in conjunction with the accompanying drawings of the specification. It should be noted here that the description of these implementation manners is used to help understand the present invention, but does not constitute a limitation on the present invention. In addition, the technical features involved in the various implementation manners of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time, and it can also represent electrical connection, unless otherwise specified in this article.

[0052] Referring to the attached Figure 1 As shown in the figure, this embodiment provides a regulator with automatic fault state monitoring and self-repairing function, and the regulator includes

[0053] A differential pressure transmitter 3 for monitoring the differential pressure change between the upper chamber 1 of the diaphragm and the lower chamber 2 of the diaphragm;

[0054] A displacement transmitter 5 for monitoring the displacement of the valve stem 4;

[0055] A pressure transmitter 7 for monitoring the medium pressure at the outlet 6 of the regulator;

[0056] A vibration sensor 8 for monitoring the vibration parameters of the regulator;

[0057] A central processing unit 9 which is respectively connected to the differential pressure transmitter 3, the displacement transmitter 5, the pressure transmitter 7 and the vibration sensor 8, and real-time receives the parameter data transmitted by the differential pressure transmitter 3, the displacement transmitter 5, the pressure transmitter 7 and the vibration sensor 8, and judges the received parameter data to obtain the fault state;

[0058] The diaphragm assembly of the pressure regulator includes a diaphragm 10 and a recovery tray 11. The recovery tray 11 is slidably and sealingly assembled on the upper diaphragm cover 12 of the pressure regulator. The diaphragm 10 is fixed between the upper diaphragm cover 12 and the lower diaphragm cover 13. Both the diaphragm 10 and the recovery tray 11 are fixedly assembled with the valve stem 4. A cavity Ⅰ 14 is formed between the recovery tray 11 and the diaphragm 10, and the recovery tray 11 and the upper diaphragm cover 12 cooperate to form an upper diaphragm cavity 1. A recovery hole 15 communicating the upper diaphragm cavity 1 with the cavity Ⅰ 14 is provided on the recovery tray 11, and a one-way valve assembly 16 that prevents the pressure in the cavity Ⅰ 14 from flowing into the upper diaphragm cavity 1 is assembled on the recovery hole 15.

[0059] A sealing valve flap 19 is provided on the valve seat 17 of the pressure regulator. A sealing valve port 20 that cooperates with the sealing valve flap 19 to form a sealing pair is provided at the bottom of the valve core 18. A recovery valve port 21 is formed at the outer edge of the top of the valve seat 17. The recovery valve port 21 and the inner edge surface 22 of the sealing valve port at the bottom of the valve core 18 cooperate to form a recovery sealing pair. When the sealing valve flap 19 is in the normal state, after the sealing port is sealed with the sealing valve flap 19, there is a set interval between the recovery valve port 21 and the recovery valve port 21 at the bottom of the valve core 18.

[0060] In this embodiment, the central processor 9 collects various operating parameters of the pressure regulator, continuously improves various data in its storage data path, and can perform self-learning according to the operating parameters during the normal operation of the pressure regulator.

[0061] The central processor 9 collects the moving speed and distance of the valve stem 4 during the normal use of the pressure regulator through the displacement transmitter 5, and collects the speed and high and low values of the pressure change at the outlet 6 of the pressure regulator during the normal use of the pressure regulator through the pressure transmitter 7, and forms a pressure curve. When the central processor 9 monitors that the moving speed of the valve stem 4 suddenly stops or moves rapidly through the displacement transmitter 5, and at the same time the central processor 9 monitors that the pressure fluctuation at the outlet 6 of the pressure regulator exceeds the normal range through the pressure transmitter 7, it proves that a jamming fault has occurred in the valve core 18.

[0062] The central processor 9 collects the pressure difference between the upper diaphragm cavity 1 and the lower diaphragm cavity 2 during the normal operation of the pressure regulator through the differential pressure transmitter 3. During the normal operation of the pressure regulator, the pressure difference value between the upper diaphragm cavity 1 and the lower diaphragm cavity 2 will not exceed a value, and there will be a pressure difference value (i.e., there is a pressure difference). When the displacement transmitter 5 monitors that the position of the valve stem 4 is at the lowest value, this pressure difference value will be in the state of 0. When the pressure regulator is operating normally, if the pressure difference value between the upper diaphragm cavity 1 and the lower diaphragm cavity 2 suddenly decreases and the position of the valve stem 4 is not at the lowest value, it proves that the diaphragm 10 is ruptured.

[0063] When the diaphragm 10 ruptures, the lower chamber 2 of the diaphragm communicates with the chamber I 14. The pressure in the lower chamber 2 of the diaphragm acts on the check valve in the restoring tray 11, and the check valve cuts off the restoring hole 15 between the chamber I 14 and the upper chamber 1 of the diaphragm. At this time, the function of the diaphragm 10 will be replaced by the restoring tray 11, the troubleshooting is completed, and the voltage regulator automatically resumes operation.

[0064] The central processing unit 9 collects the vibration parameters of the voltage regulator and the gas through the vibration sensor 8. The vibration parameters include the vibration frequency and amplitude. When the vibration frequency increases or decreases, combined with the change of the position of the valve stem 4 monitored by the displacement transmitter 5 and the change of the pressure at the outlet 6 of the voltage regulator monitored by the pressure transmitter 7, it can be judged whether the voltage regulator is in a fault state.

[0065] When the sealing valve flap 19 is damaged or falls off, the valve core 18 and the valve stem 4 will continue to move downward until the valve core 18 returns to the sealing point, that is, when the restoring valve port 21 formed by the outer edge of the top of the valve seat 17 cooperates with the inner edge surface 22 of the sealing valve port at the bottom of the valve core 18 to form a restoring sealing pair, secondary sealing is achieved, and the working state of the voltage regulator is restored to automatically eliminate the fault. And due to the increased stroke of the valve stem 4, the displacement transmitter 5 monitors that the position of the valve stem 4 is below the lowest value and gives a fault diagnosis result.

[0066] As an implementation manner of this embodiment, referring to the attached Figure 2 As shown in the figure, an assembly groove 23 for assembling the check valve assembly 16 is provided on the restoring tray 11, and the restoring hole 15 communicates with the bottom of the assembly groove 23 and the chamber I 14.

[0067] Furthermore, the check valve assembly 16 includes a check valve seat 24, a steel ball 25 and a spring 26. The check valve seat 24 is assembled on the assembly groove 23, the steel ball 25 is placed in the assembly groove 23, and the spring 26 is arranged between the steel ball 25 and the bottom of the assembly groove 23. Through the structure of the check valve assembly 16, when the diaphragm 10 ruptures, the pressure in the lower chamber 2 of the diaphragm enters the chamber I 14. The pressure in the lower chamber 2 of the diaphragm acts on the steel ball 25 through the restoring hole 15. Under the action of the spring 26 and the pressure in the lower chamber 2 of the diaphragm, the steel ball 25 is blocked on the check valve seat 24 so that the pressure in the lower chamber 2 of the diaphragm enters the upper chamber 1 of the diaphragm. When the steel ball 25 blocks the check valve seat 24, the restoring tray 11 replaces the ruptured diaphragm 10, and the voltage regulator automatically resumes operation.

[0068] At the same time, when the diaphragm 10 is working normally (without rupture), the pressure in the upper chamber 1 of the diaphragm acts on the steel ball 25. Coupled with the self-gravity of the steel ball 25, the spring 26 is compressed, so that the steel ball 25 leaves the check valve seat 24, the restoring hole 15 communicates the upper chamber 1 of the diaphragm with the chamber I 14, and the pressure in the upper chamber 1 of the diaphragm enters the chamber I 14 and acts on the diaphragm 10.

[0069] As another implementation manner of this embodiment, one end of the recovery hole 15 communicating with the assembly groove 23 protrudes from the bottom of the assembly groove 23. The protruding amount of this protruding part should be greater than the height when the spring 26 is compressed to the maximum, so that the steel ball 25 can cooperate with this protruding hole position to block this hole position, avoiding the sudden increase of the pressure in the upper chamber 1 of the diaphragm and entering the cavity Ⅰ14 to damage the diaphragm 10.

[0070] As another implementation manner of this embodiment, as shown in the attached Figure 3 As shown in the figure, the sealing valve port 20 is formed by the outer edge of the valve core 18 protruding from the bottom of the valve core 18. A slope is formed between the inner edge of the outer edge of the valve core 18 and the bottom of the valve core 18, and this slope is the inner edge surface 22 of the sealing valve port. The recovery valve port 21 is formed by the outer edge of the valve seat 17 protruding from the sealing valve flap 19. The outer edge of the valve seat 17 is in an inverted conical structure, and the outer edge of the valve seat 17 cooperates with the slope of the inner edge of the sealing valve port 20 to form a hard sealing pair.

[0071] As another implementation manner of this embodiment, referring to the attached drawings of the specification Figure 1 As shown in the figure, the vibration sensor 8 is assembled on the top of the pressure regulator. The displacement transmitter 5 is assembled on the upper diaphragm cover 12 of the pressure regulator. The acquisition rod of the displacement transmitter 5 is inserted into the upper chamber 1 of the diaphragm from the upper diaphragm cover 12 and is connected to the recovery tray 11. The pressure transmitter 7 is arranged on the connecting pipeline 27 between the upper chamber 1 of the diaphragm and the pipeline downstream of the outlet 6 of the pressure regulator.

[0072] As another preferred embodiment of the present invention, referring to the attached drawings of the specification Figure 1 As shown in the figure, this embodiment discloses a fault determination method for a fault state automatic monitoring and self-repairing type pressure regulator, and this method includes

[0073] The central processing unit 9 collects the moving speed and distance of the valve stem 4 during the normal use of the pressure regulator in real time through the displacement transmitter 5 and stores them;

[0074] The central processing unit 9 collects the pressure change at the outlet 6 of the pressure regulator during the normal use of the pressure regulator in real time through the pressure transmitter 7, forms a pressure curve, and stores it;

[0075] The central processing unit 9 collects the differential pressure change between the upper chamber 1 and the lower chamber 2 of the diaphragm during the normal operation of the pressure regulator in real time through the differential pressure transmitter 3 and stores it;

[0076] The central processing unit 9 collects the vibration parameters during the normal operation of the pressure regulator in real time through the vibration sensor 8 and stores them;

[0077] When the central processing unit 9 monitors through the displacement transmitter 5 that the moving speed of the valve stem 4 suddenly stops or moves rapidly, and at the same time the central processing unit 9 monitors through the pressure transmitter 7 that the pressure fluctuation at the outlet 6 of the pressure regulator exceeds the normal range, it indicates that a jamming fault occurs in the valve core 18;

[0078] When the central processing unit 9 monitors that the pressure difference between the upper chamber 1 and the lower chamber 2 of the diaphragm suddenly decreases through the differential pressure transmitter 3, and at the same time the central processing unit 9 monitors that the valve stem 4 is not in the lowest position through the displacement transmitter 5, it indicates that a rupture fault has occurred in the diaphragm 10;

[0079] When the central processing unit 9 monitors through the displacement transmitter 5 that the position of the valve stem 4 is below the lowest value, it indicates that a damage or detachment fault has occurred in the sealing valve flap 19;

[0080] When the central processing unit 9 monitors through the vibration sensor 8 that the change in the vibration parameters of the pressure regulator exceeds the normal range, and then combines with the change in the position of the valve stem 4 monitored by the displacement transmitter 5 and the change in the pressure at the outlet 6 of the pressure regulator monitored by the pressure transmitter 7, it determines whether the pressure regulator is in a fault state.

[0081] The central processing unit 9 collects the operating parameters of the pressure regulator in the normal operating state, conducts data self-learning and storage. Once a certain operating parameter monitored exceeds the fluctuation range during the normal operation of the pressure regulator, a fault determination can be made. Compared with the method of setting a fixed threshold, the fault determination of the pressure regulator is more flexible and variable, avoiding misjudgment caused by a certain operating parameter exceeding the fixed threshold due to special circumstances.

[0082] For the display of the fault state, according to the type of the fault and the component where the fault occurs, different alarm methods can be used for display. For example, the central processing unit 9 is connected to a display, and there is a virtual model of the pressure regulator in the central processing unit 9. According to the type of the fault and the component where the fault occurs, the fault alarm is carried out by highlighting the faulty component in the virtual model, so as to remind the operator which component has what kind of fault, reduce the time for the operator to troubleshoot the fault, and improve the maintenance efficiency.

Claims

1. A voltage regulator with automatic fault status monitoring and self - repair function, characterized in that, the voltage regulator includes: a differential pressure transmitter (3) for monitoring the change of the differential pressure between the upper chamber (1) and the lower chamber (2) of the diaphragm; a displacement transmitter (5) for monitoring the displacement of the valve stem (4); a pressure transmitter (7) for monitoring the medium pressure at the outlet (6) of the voltage regulator; a vibration sensor (8) for monitoring the vibration parameters of the voltage regulator; a central processing unit (9) which is respectively connected to the differential pressure transmitter (3), the displacement transmitter (5), the pressure transmitter (7) and the vibration sensor (8), and receives in real time the parameter data transmitted by the differential pressure transmitter (3), the displacement transmitter (5), the pressure transmitter (7) and the vibration sensor (8), and judges the received parameter data to obtain the fault status; the diaphragm assembly of the voltage regulator includes a diaphragm (10) and a recovery tray (11). The recovery tray (11) is slidably and sealedly assembled on the upper membrane cover (12) of the voltage regulator. The diaphragm (10) is fixed between the upper membrane cover (12) and the lower membrane cover (13). Both the diaphragm (10) and the recovery tray (11) are fixedly assembled with the valve stem (4). A cavity Ⅰ (14) is formed between the recovery tray (11) and the diaphragm (10). The recovery tray (11) and the upper membrane cover (12) cooperate to form the upper chamber (1) of the diaphragm. A recovery hole (15) communicating the upper chamber (1) of the diaphragm with the cavity Ⅰ (14) is provided on the recovery tray (11), and a check valve assembly (16) for preventing the pressure in the cavity Ⅰ (14) from flowing to the upper chamber (1) of the diaphragm is assembled on the recovery hole (15); a sealing valve flap (19) is provided on the valve seat (17) of the voltage regulator, and a sealing valve port (20) which cooperates with the sealing valve flap (19) to form a sealing pair is provided at the bottom of the valve core (18). A recovery valve port (21) is formed at the outer edge of the top of the valve seat (17), and the recovery valve port (21) cooperates with the inner edge surface (22) of the sealing valve port at the bottom of the valve core (18) to form a recovery sealing pair. When the sealing valve flap (19) is in the normal state, after the sealing port is sealed with the sealing valve flap (19), there is a set interval between the recovery valve port (21) and the recovery valve port (21) at the bottom of the valve core (18).

2. The voltage regulator with automatic fault status monitoring and self - repair function according to claim 1, characterized in that: an assembly groove (23) for assembling the check valve assembly (16) is provided on the recovery tray (11), and the recovery hole (15) communicates the bottom of the assembly groove (23) with the cavity Ⅰ (14).

3. The voltage regulator with automatic fault status monitoring and self - repair function according to claim 2, characterized in that: the check valve assembly (16) includes a check valve seat (24), a steel ball (25) and a spring (26). The check valve seat (24) is assembled on the assembly groove (23), the steel ball (25) is placed in the assembly groove (23), and the spring (26) is arranged between the steel ball (25) and the bottom of the assembly groove (23).

4. The voltage regulator with automatic fault status monitoring and self - repair function according to claim 2 or 3, characterized in that: one end of the recovery hole (15) communicating with the assembly groove (23) protrudes from the bottom of the assembly groove (23).

5. The automatic fault state monitoring and self-repairing voltage regulator according to any one of claims 1-3, characterized in that: The sealing valve port (20) is formed by the outer edge of the valve core (18) protruding from the bottom of the valve core (18). A slope is formed between the inner edge of the outer edge of the valve core (18) and the bottom of the valve core (18), and this slope is the inner edge surface (22) of the sealing valve port.

6. The automatic fault state monitoring and self-repairing voltage regulator according to claim 5, characterized in that: The recovery valve port (21) is formed by the outer edge of the valve seat (17) protruding from the sealing valve flap (19). The outer edge of the valve seat (17) is in an inverted conical structure, and the outer edge of the valve seat (17) cooperates with the slope of the inner edge of the sealing valve port (20) to form a hard sealing pair.

7. The automatic fault state monitoring and self-repairing voltage regulator according to claim 1, 2, 3 or 6, characterized in that: The vibration sensor (8) is assembled on the top of the voltage regulator.

8. The automatic fault state monitoring and self-repairing voltage regulator according to claim 1, 2, 3 or 6, characterized in that: The displacement transmitter (5) is assembled on the upper diaphragm cover (12) of the voltage regulator. The acquisition rod of the displacement transmitter (5) is inserted into the upper diaphragm chamber (1) from the upper diaphragm cover (12) and is connected to the recovery tray (11).

9. The automatic fault state monitoring and self-repairing voltage regulator according to claim 1, 2, 3 or 6, characterized in that: The pressure transmitter (7) is arranged on the connecting pipeline (27) between the upper diaphragm chamber (1) and the pipeline downstream of the outlet (6) of the voltage regulator.

10. The fault determination method of the automatic fault state monitoring and self-repairing voltage regulator according to any one of claims 1-9, characterized in that: This method includes: The central processing unit (9) collects the moving speed and distance of the valve stem (4) during the normal use of the voltage regulator in real time through the displacement transmitter (5) and stores them; The central processing unit (9) collects the pressure change at the outlet (6) of the voltage regulator during the normal use of the voltage regulator in real time through the pressure transmitter (7), forms a pressure curve and stores it; The central processing unit (9) collects the differential pressure change between the upper diaphragm chamber (1) and the lower diaphragm chamber (2) during the normal operation of the voltage regulator in real time through the differential pressure transmitter (3) and stores it; The central processing unit (9) collects the vibration parameters during the normal operation of the voltage regulator in real time through the vibration sensor (8) and stores them; When the central processing unit (9) monitors that the moving speed of the valve stem (4) suddenly stops or moves rapidly through the displacement transmitter (5), and at the same time the central processing unit (9) monitors that the pressure fluctuation at the outlet (6) of the voltage regulator exceeds the normal range through the pressure transmitter (7), it indicates that a jamming fault has occurred in the valve core (18); When the central processing unit (9) monitors that the differential pressure value between the upper diaphragm chamber (1) and the lower diaphragm chamber (2) suddenly decreases through the differential pressure transmitter (3), and at the same time the central processing unit (9) monitors that the valve stem (4) is not in the lowest position through the displacement transmitter (5), it indicates that a rupture fault has occurred in the diaphragm (10); When the central processing unit (9) monitors through the displacement transmitter (5) that the position of the valve stem (4) is below the lowest value, it indicates that there is a damage or detachment fault in the sealing valve flap (19); When the central processing unit (9) monitors through the vibration sensor (8) that the change in the vibration parameters of the pressure regulator exceeds the normal range, and then combines with the change in the position of the valve stem (4) monitored by the displacement transmitter (5) and the change in the pressure at the outlet (6) of the pressure regulator monitored by the pressure transmitter (7), it determines whether the pressure regulator is in a fault state.

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