Electrically controlled safety valve, control method, computer readable storage medium and program product

Abstract

The electric control safety valve, control method, computer readable storage medium and program product are used for preventing the pressure in the pressure container from exceeding the pressure limit, comprising a main valve, a valve island, a controller and a pressure sensor. The main valve is a pneumatic stop valve, the pneumatic control cavity of the main valve is communicated with the air outlet A of the valve island, the air inlet of the main valve is communicated with the pressure container, and the air outlet of the main valve is directly communicated with the atmosphere. The valve island is a composite normally open two-position three-way valve composed of three same electromagnetic valves, the air inlet P of the valve island is communicated with the pressure container, and the air outlets T2 and T3 of the valve island are both communicated with the atmosphere. The controller compares the pressure value of the pressure container collected by the pressure sensor with the safety valve opening and closing pressure value set by the program, controls the action of the electromagnetic valve in the valve island according to the control logic, realizes the opening and closing of the main valve, and completes the pressure control of the pressure container. The electric control safety valve provided by the application has high pressure control precision, a large pressure adjustable interval, large and adjustable air discharge flow, a fault redundancy function and no fluid-solid coupling vibration during air discharge.

Description

Technical Field

[0001] This application relates to the field of safety valve technology for launch vehicles, and in particular to an electrically controlled safety valve, a control method, a computer-readable storage medium, and a program product. Background Technology

[0002] Liquid-propellant launch vehicle pressurization and delivery systems introduce high-pressure gas into propellant tanks to ensure the engine propellant inlet pressure meets requirements. To prevent pressure exceeding the tank's pressure limit and excessive engine inlet pressure, safety valves are installed on the tanks. Existing liquid-propellant launch vehicles all use pilot-operated safety valves. While pilot-operated safety valves have a large venting flow rate, they contain multiple spring-oscillator systems. During venting, these systems are prone to coupling with the piping system and gas, generating fluid-structure interaction vibrations that can lead to product failure, and vibration suppression is difficult. Their pressure control accuracy is significantly affected by the launch vehicle's flight vibration environment, spring stiffness stability, and friction. Their adjustable pressure range is limited by the spring's adjustable stroke, resulting in a small adjustable range and low versatility. Furthermore, opening and closing failures are all single-point failures, lacking fault redundancy.

[0003] The Chinese invention patent for a cryogenic bellows pilot-operated safety valve (CN112815123B) discloses a technical solution for a cryogenic bellows pilot-operated safety valve with a spring that is not easily worn. However, this solution is essentially still based on the principle and structure of a traditional pilot-operated safety valve, and it still has the disadvantages of low pressure control accuracy, small adjustable pressure range, lack of fault redundancy function, and easy generation of fluid-structure interaction vibration.

[0004] Chinese invention patent CN105333183B discloses a technical solution for controlling the opening and closing of a safety valve by using an electromagnet based on the lever principle. The failure of the opening and closing action of this solution is a single point failure, without fault redundancy function, and adopts a direct-acting safety valve structure with a small venting flow.

[0005] Chinese invention patent CN115823485A discloses a safety valve structure that replaces the pilot valve of a pilot-operated safety valve with a two-position three-way solenoid valve, a pressure sensor, and a control system. However, the technical solution disclosed in this patent is still a single-point-of-failure structure, lacking fault redundancy, and its reliability is not significantly improved. Furthermore, it does not have an adjustable venting flow rate. Summary of the Invention

[0006] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide an electrically controlled safety valve and control method with high pressure control accuracy, large adjustable pressure range, large venting flow, adjustable venting flow, one degree of fault redundancy function, and no fluid-structure coupling vibration during the venting process.

[0007] The technical solution provided in this application is as follows:

[0008] An electrically controlled safety valve includes a main valve, a valve island, a controller, and a pressure sensor. The main valve has a pneumatic control chamber, an inlet, and a vent. The inlet is connected to a pressure vessel, and the vent is directly open to the atmosphere. When the pneumatic control chamber is pressurized, the vent closes, and the main valve is closed. When the pneumatic control chamber is depressurized, the inlet and vent connect, and the main valve is open. The valve island has a normally open outlet A, an inlet P, and normally closed vents T2 and T3. The pneumatic control chamber is connected to the normally open outlet A, the valve island inlet P is connected to the pressure vessel, and the normally closed vents T2 and T3 are both open to the atmosphere. The controller is connected to the valve island. The pressure sensor measures the pressure P inside the pressure vessel and transmits the pressure P to the controller. The controller compares the pressure P inside the pressure vessel with a preset safety valve opening / closing pressure value and controls the main valve's pneumatic control chamber's pressurization or depressurization pressure by controlling the valve island.

[0009] The valve island includes three normally open two-position three-way solenoid valves: solenoid valve DF1, solenoid valve DF2, and solenoid valve DF3. All three valves are connected to a controller, which controls their energized or de-energized states. Solenoid valve DF1 has a normally open outlet A1, an inlet P1, and a normally closed vent T1. When energized, outlet A1 and vent T1 are connected, while inlet P1 is disconnected. When de-energized, outlet A1 and inlet P1 are connected, while vent T1 is disconnected. Solenoid valve DF2 has a normally open outlet A2, an inlet P2, and a normally closed vent T1. T2, when energized, has normally open outlet A2 and normally closed vent T2 connected, while inlet P2 is not connected. When de-energized, normally open outlet A2 and inlet P2 are connected, while normally closed vent T2 is not connected. Solenoid valve DF3 has normally open outlet A3, inlet P3, and normally closed vent T3. When energized, normally open outlet A3 and normally closed vent T3 are connected, while inlet P3 is not connected. When de-energized, normally open outlet A3 and inlet P3 are connected, while normally closed vent T3 is not connected. Normally open outlet A is connected to normally open outlet A1, inlet P1 is connected to normally open outlet A3, inlet P2 and inlet P3 are connected to the pressure vessel, and normally open outlet A2 is connected to normally closed vent T1.

[0010] The main valve includes a valve body, a valve disc, and a bellows. An air inlet and an air outlet are located in the valve body. One end of the bellows is connected to the inner wall of the main valve, and the other end is connected to the valve disc. When the valve disc contacts the air outlet, the main valve closes, and a pneumatic control chamber is formed inside the bellows.

[0011] The main valve also includes a spring, one end of which is connected to the inner wall of the main valve and the other end is connected to the valve disc to supplement the sealing force required for the valve disc to seal under low pressure.

[0012] The main valve also includes a limiting ring, which is located inside the bellows. One end of the limiting ring is connected to the inner wall of the main valve and is used to limit the valve disc.

[0013] The height of the limiting ring is adjustable so that the maximum opening of the main valve is adjustable.

[0014] A control method for an electrically controlled safety valve includes:

[0015] S1: Set the shut-off pressure P from low to high according to the pressure control requirements. 关 1. Open pressure P 开 Open pressure P under fault condition g ;

[0016] S2: Set the pressure vessel pressure P to the fault condition opening pressure P. g A comparison is made when the pressure vessel pressure P is less than the fault-condition opening pressure P. g If the opening is normal, execute the normal branch program of S3; otherwise, if the opening is faulty, execute the faulty branch program of S4.

[0017] S3: The normal branch procedure includes: comparing the pressure vessel pressure P with the shutdown pressure P. 关 1. Open pressure P 开 Compare;

[0018] When the pressure vessel pressure P is less than the closing pressure P 关 When the solenoid valves DF1, DF2, and DF3 are de-energized, the system returns to S2.

[0019] When the pressure P of the pressure vessel is greater than the opening pressure P 开 When the solenoid valves DF1 and DF2 are energized, and the solenoid valve DF3 is de-energized, the main valve opens and the gas in the pressure vessel is discharged to the atmosphere through the vent, returning to S2.

[0020] When the pressure P of the pressure vessel is at the closing pressure P 关 and opening pressure P 开 During this period, control solenoid valves DF1 and DF2 remain in the previous energized state, which is either energized or de-energized. Solenoid valve DF3 is de-energized, and the process returns to S2.

[0021] S4: Fault branch procedure includes: comparing pressure vessel pressure P with shutdown pressure P. 关 Fault condition opening pressure P g The comparison showed that the pressure vessel pressure P was greater than the fault-condition opening pressure P. gAt that time, S41 is performed, and the comparison result shows that the pressure vessel pressure P is at the closing pressure P. 关 Open pressure P under fault condition g During this period, S42 is performed, and the comparison result shows that the pressure vessel pressure P is less than the closing pressure P. 关 At that time, proceed with S43;

[0022] S41: Control solenoid valves DF1 and DF2 to be de-energized, solenoid valve DF3 to be energized, return to S4;

[0023] S42: Control solenoid valves DF1 and DF2 to be de-energized, solenoid valve DF3 remains in the previous energized state, and return to S4;

[0024] S43: Control solenoid valves DF1, DF2, and DF3 to de-energize, then return to S2.

[0025] The energizing states of solenoid valves DF1 and DF2 as described in S3 when maintaining the previous energizing state include:

[0026] The pressure vessel pressure P rises to the shut-off pressure P 关 and opening pressure P 开 When the pressure vessel pressure P is between these values, the pressure P is at the closing pressure P. 关 and opening pressure P 开 The previous state was when the pressure vessel pressure P was less than the closing pressure P. 关 At this time, solenoid valves DF1 and DF2 remain de-energized;

[0027] The pressure vessel pressure P drops to the shut-off pressure P 关 and opening pressure P 开 When the pressure vessel pressure P is between these values, the pressure P is at the closing pressure P. 关 and opening pressure P 开 The previous state was when the pressure vessel pressure P was greater than the opening pressure P. 开 Solenoid valves DF1 and DF2 remain energized;

[0028] The energized state of the control solenoid valve DF3 as described in S42 when it maintains the previous energized state includes:

[0029] The pressure vessel pressure P rises to the shut-off pressure P 关 Open pressure P under fault condition g When the pressure vessel pressure P is between these values, the pressure P is at the closing pressure P. 关 Open pressure P under fault condition g The previous state was when the pressure vessel pressure P was less than the closing pressure P. 关 At this time, solenoid valve DF3 remains de-energized;

[0030] The pressure vessel pressure P drops to the shut-off pressure P 关 Open pressure P under fault condition g When the pressure vessel pressure P is between these values, the pressure P is at the closing pressure P. 关 Open pressure P under fault condition g The previous state was when the pressure vessel pressure P was greater than the fault-state opening pressure P. g At this time, solenoid valve DF3 remains energized.

[0031] A computer program product includes a computer program / instructions that, when executed by a processor, implement the steps of the method described above.

[0032] A computer-readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implement the steps of the method described above.

[0033] In summary, this application includes at least the following beneficial technical effects:

[0034] 1) This invention provides an electrically controlled safety valve, including a main valve, a valve island, a controller, and a pressure sensor. It adopts electromechanical technology, and the pressure control accuracy is only affected by the measurement accuracy of the pressure sensor. The measurement accuracy of existing pressure sensors is much higher than that of mechanical safety valves. Therefore, the electrically controlled safety valve provided by this invention has high pressure control accuracy.

[0035] 2) The present invention provides an electrically controlled safety valve and its control program. By modifying the relevant parameters of the control program, the opening pressure and closing pressure of the electrically controlled safety valve can be changed. The pressure adjustment is convenient, the pressure adjustment range is large, and the versatility is strong. It does not have the disadvantage that the pressure adjustment range of mechanical safety valves is limited by the adjustable stroke of the spring.

[0036] 3) The present invention provides an electrically controlled safety valve and its control program, which controls the opening and closing of the main valve through the valve island, that is, controls the large airflow through the main valve through the small airflow through the valve island, resulting in a large venting flow rate; and the limit ring is designed with a height adjustable structure, which can realize the adjustable venting flow rate.

[0037] 4) The present invention provides an electrically controlled safety valve and its control program. The valve island is a composite normally open two-position three-way valve composed of three identical normally open two-position three-way solenoid valves. Combined with its control program, it realizes a first-degree fault redundancy function and has high reliability. The main solenoid valves are solenoid valve DF1 and solenoid valve DF2. The first-degree fault redundancy function means that even if the main solenoid valve is damaged, it can still be used normally through the valve island structure and control method of this patent.

[0038] 5) The present invention provides an electrically controlled safety valve and its control program, which only works in two extreme positions: closed and maximum opening. There are no degrees of freedom of the spring-oscillator system that would cause resonance, and there is no fluid-structure coupling vibration during the venting process. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of an electrically controlled safety valve according to a preferred embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the main valve in a preferred embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the valve island in a preferred embodiment of the present invention;

[0042] Figure 4 This is a control logic diagram of an electrically controlled safety valve control program according to a preferred embodiment of the present invention;

[0043] Figure 5 A PLC control program for an electrically controlled safety valve, which is a preferred embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram illustrating the normal opening principle of an electrically controlled safety valve according to a preferred embodiment of the present invention.

[0045] Figure 7 This is a schematic diagram illustrating the normal closing principle of an electrically controlled safety valve according to a preferred embodiment of the present invention.

[0046] Figure 8 This is a schematic diagram illustrating the opening failure principle of an electrically controlled safety valve solenoid valve (DF1) that fails to operate when energized, according to a preferred embodiment of the present invention.

[0047] Figure 9 This is a schematic diagram illustrating the fault-solving principle for an electrically controlled safety valve solenoid valve (DF1) that fails to open when energized, according to a preferred embodiment of the present invention.

[0048] Figure 10 This is a schematic diagram illustrating the opening failure principle of an electrically controlled safety valve solenoid valve (DF2) that fails to operate when energized, according to a preferred embodiment of the present invention.

[0049] Figure 11 This is a schematic diagram illustrating a fault-solving principle for an electrically controlled safety valve solenoid valve (DF2) that fails to open when energized, according to a preferred embodiment of the present invention.

[0050] Figure 12 This is a schematic diagram illustrating the closing principle of an electrically controlled safety valve solenoid valve (DF1) that fails to return to its original position after power failure, according to a preferred embodiment of the present invention.

[0051] Figure 13 This is a schematic diagram illustrating the closing principle of an electrically controlled safety valve solenoid valve (DF2) that fails to return to its original position after power failure, according to a preferred embodiment of the present invention.

[0052] In the picture, cable, Pressure tapping tube, Valve island envelope, power ups, Gas flow lines.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1. Main valve; 11. Air inlet; 12. Air outlet; 13. Pneumatic control chamber; 14. Valve body; 15. Valve disc; 16. Bellows; 17. Spring; 18. Limit ring; 2. Valve island; 21. Solenoid valve (DF1); 22. Solenoid valve (DF2); 23. Solenoid valve (DF3); 3. Controller; 4. Pressure sensor. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0056] Example 1

[0057] This embodiment provides an electrically controlled safety valve, see below. Figure 1 As shown, it includes a main valve 1, a valve island 2, a controller 3, and a pressure sensor 4.

[0058] See Figure 2 As shown, the main valve 1 is a pneumatic shut-off valve, including an air inlet 11, an air outlet 12, a pneumatic control chamber 13, a valve body 14, a valve disc 15, a bellows 16, a spring 17, and a limit ring 18. The pressure-sensing diameter of the bellows 16 should be larger than the diameter of the air outlet 12, dividing the inner cavity of the main valve 1 into the pneumatic control chamber 13 and the air outlet channel, while simultaneously initiating a sealing function. The valve disc 15 is connected to the free end of the bellows 16 and forms a sealing pair with the air outlet 12. The spring force of the spring 17 supplements the sealing force required for the valve disc 15 to seal under low pressure, ensuring the reliability of the low-pressure seal. The limit ring 18 controls the maximum opening degree of the main valve 1. When the pneumatic control chamber 13 is pressurized, the main valve 1 remains closed. When the pneumatic control chamber 13 is not pressurized, the valve disc 15 opens under the action of the gas pressure in the air outlet channel of the main valve 1 and quickly opens to the maximum opening degree, pressing against the limit ring 18.

[0059] Preferably, in this embodiment, the limiting ring 18 is designed with an adjustable height structure, thereby enabling the maximum opening degree of the main valve 1 to be adjustable.

[0060] See Figures 1-2 As shown, the pneumatic control chamber 13 of the main valve 1 is connected to the normally open outlet A of the valve island 2 through a pressure tapping pipe, the inlet 11 of the main valve 1 is connected to the pressure vessel, and the outlet 12 of the main valve 1 is directly connected to the atmosphere.

[0061] See Figure 3 As shown, valve island 2 is a composite normally open two-position three-way valve composed of three identical normally open two-position three-way solenoid valves, including solenoid valve (DF1) 21, solenoid valve (DF2) 22, and solenoid valve (DF3) 23. Solenoid valves (DF1) 21, (DF2) 22, and (DF3) 23 have identical structures. Taking solenoid valve (DF1) 21 as an example, solenoid valve (DF1) 21 has a normally open outlet port A1, an inlet port P1, and a normally closed vent port T1. When energized, the normally open outlet port A1 and the normally closed vent port T1 are connected, while the inlet port P1 is not connected. When de-energized, the normally open outlet port A1 and the inlet port P1 are connected, while the normally closed vent port T1 is not connected; that is, when energized... Figure 3 The left side frame of the solenoid valve (DF1) 21 is in a state of no power. Figure 3 The right frame status of the solenoid valve (DF1)21.

[0062] See Figures 1-3 As shown, the air inlet P1 of solenoid valve (DF1) 21 is connected to the normally open air outlet A3 of solenoid valve (DF3) 23 via a pressure tapping pipe. The normally open air outlet A1 of solenoid valve (DF1) 21 is connected to the pneumatic control chamber 13 of the main valve 1 via a pressure tapping pipe. The normally closed air vent T1 of solenoid valve (DF1) 21 is connected to the normally open air outlet A2 of solenoid valve (DF2) 22 via a pressure tapping pipe. The air inlet P2 of solenoid valve (DF2) 22 and the air inlet P3 of solenoid valve (DF3) 23 are connected to the air inlet P of valve island 2 via pressure tapping pipes. The normally closed air vent T2 of solenoid valve (DF2) 22 and the normally closed air vent T3 of solenoid valve (DF3) 23 are directly open to the atmosphere. The electrical interfaces of solenoid valve (DF1) 21, solenoid valve (DF2) 22, and solenoid valve (DF3) 23 are connected to the controller 3 via cables.

[0063] The air inlet P of valve island 2 is connected to the pressure vessel.

[0064] See Figure 1 As shown, pressure sensor 4 transmits the pressure value of the pressure vessel to controller 3;

[0065] The controller 3 compares the pressure value of the pressure vessel with the safety valve opening and closing pressure value set in the program, and controls the three solenoid valves in the valve island 2 to operate according to the control logic. This controls the inflation or deflation pressure of the pneumatic control chamber 13 of the main valve 1, thereby enabling the main valve 1 to open and close, release air, or stop releasing air, thus completing the pressure control of the pressure vessel.

[0066] Example 2

[0067] Based on the same inventive concept, this embodiment also provides a control method for an electrically controlled safety valve, including the following:

[0068] See Figure 4As shown, the control program sets the shut-off pressure P from low to high according to the pressure control requirements. 关 1. Open pressure P 开 Fault condition opening pressure P g The controller 3 receives the pressure P of the pressure vessel transmitted by the pressure sensor 4, and opens the pressure P in case of a fault. g A comparison is made, and the result is used to determine whether an opening failure has occurred. The failure occurs when the pressure vessel pressure P is less than the fault-state opening pressure P. g If the opening is normal, execute the normal branch program; otherwise, if the opening is faulty, execute the faulty branch program.

[0069] The normal branching procedure will compare the pressure vessel pressure P with the shut-off pressure P. 关 1. Open pressure P 开 Comparison: When the pressure vessel pressure P is less than the closing pressure P... 关 When the pressure vessel pressure P is greater than the opening pressure P, the solenoid valves (DF1) 21, (DF2) 22, and (DF3) 23 are de-energized. 开 When the program controls solenoid valves (DF1) 21 and (DF2) 22 to be energized, solenoid valve (DF3) 23 is de-energized; when the pressure vessel pressure P is at the closing pressure P... 关 1. Open pressure P 开 During this period, the program controls solenoid valves (DF1) 21 and (DF2) 22 to remain energized, while solenoid valve (DF3) 23 is de-energized; then the program returns to the main program and opens pressure P in the fault state. g The comparison points are looped through;

[0070] The fault branch procedure compares the pressure vessel pressure P with the shut-off pressure P. 关 Fault condition opening pressure P g Comparison: When the pressure vessel pressure P is less than the closing pressure P... 关 When the program controls solenoid valves (DF1) 21, (DF2) 22, and (DF3) 23 to be de-energized; when the pressure vessel pressure P is greater than the fault condition opening pressure P... g When the program controls solenoid valves (DF1) 21 and (DF2) 22 to be de-energized, solenoid valve (DF3) 23 is energized; when the pressure vessel pressure P is at the closing pressure P... 关 Fault condition opening pressure P g During this period, the program controls solenoid valves (DF1) 21 and (DF2) 22 to be de-energized, while solenoid valve (DF3) 23 remains energized. Then, the program returns to the pressure comparison point in the fault branch program and loops until the pressure vessel pressure P is less than the closing pressure P. 关When the program returns to the main program and the fault status is activated, pressure P is opened. g The comparison points are looped.

[0071] See Figure 5 As shown, a PLC control program ladder diagram for an electrically controlled safety valve is provided. Output channel Y00 controls the energization or de-energization of solenoid valve (DF1) 21, output channel Y001 controls the energization or de-energization of solenoid valve (DF2) 22, and output channel Y002 controls the energization or de-energization of solenoid valve (DF3) 23. A self-locking program maintains the solenoid valve in its previous state, and an interlocking program selects the branch program. D0 represents the pressure vessel pressure P, and D10 represents the closing pressure P. 关 D20 indicates that the opening pressure P is... 开 D30 indicates that the fault condition opens the pressure P. g .

[0072] Example 3

[0073] Based on the same inventive concept, the specific working process of this embodiment will be described in detail, including the following:

[0074] See Figure 4 As shown, initially, the pressure P inside the pressure vessel increases from zero. When the pressure P inside the pressure vessel is less than the closing pressure P... 关 When the fault is detected, the program first determines that there is no fault and executes the normal branch program. The normal branch program controls solenoid valves (DF1) 21, (DF2) 22, and (DF3) 23 to be de-energized. At this time, the main valve 1 remains closed. Then the program returns to the main program and opens the pressure P in the fault state. g The comparison points are looped through;

[0075] When the pressure vessel pressure P rises to the shut-off pressure P 关 1. Open pressure P 开 During this period, the normal branch program controls solenoid valves (DF1) 21 and (DF2) 22 to remain energized, while solenoid valve (DF3) 23 is de-energized. That is, solenoid valves (DF1) 21, (DF2) 22, and (DF3) 23 are not energized. At this time, main valve 1 remains closed. Then, the program returns to the main program and opens the pressure P in the fault state. g The comparison points are looped through;

[0076] When the pressure P of the pressure vessel rises to the opening pressure P 开 Fault condition opening pressure P g During this period, the normal branch program controls solenoid valves (DF1) 21 and (DF2) 22 to be energized, while solenoid valve (DF3) 23 is de-energized. At this time, refer to... Figure 6As shown, the gas inside the pressure vessel cannot enter the pneumatic control chamber 13 of the main valve 1 through valve island 2. Simultaneously, the gas in the pneumatic control chamber 13 of the main valve 1 is discharged to the atmosphere through valve island 2. The gas pressure in the venting channel of the main valve 1 overcomes the spring force of spring 17, causing valve disc 15 of the main valve 1 to open rapidly to its maximum opening. The gas inside the pressure vessel is discharged to the atmosphere through the venting channel of the main valve 1, preventing the gas pressure inside the pressure vessel from continuing to rise. Then, the program returns to the main program and opens the pressure P in the fault state. g The comparison points are looped through;

[0077] When the pressure vessel pressure P drops to the shut-off pressure P 关 1. Open pressure P 开 During this period, the normal branch program controls solenoid valves (DF1) 21 and (DF2) 22 to remain energized, while solenoid valve (DF3) 23 is de-energized. In other words, solenoid valves (DF1) 21 and (DF2) 22 are energized, while solenoid valve (DF3) 23 is de-energized. At this time, main valve 1 remains open, continuing to vent the pressure vessel. Then, the program returns to the main program and opens pressure P in the fault state. g The comparison points are looped through;

[0078] When the pressure vessel pressure P drops below the closing pressure P 关 During this time, the normal branch program controls solenoid valves (DF1) 21, (DF2) 22, and (DF3) 23 to be de-energized. At this point, refer to... Figure 7 As shown, gas in the pressure vessel enters the pneumatic control chamber 13 of the main valve 1 through valve island 2. Simultaneously, the gas in the pneumatic control chamber 13 of the main valve 1 can no longer be discharged to the atmosphere through valve island 2. The valve disc 15 of the main valve 1 closes under the combined action of the gas pressure in the pneumatic control chamber 13 and the spring force of spring 17. That is, the main valve 1 is closed, and the gas in the pressure vessel can no longer be discharged to the atmosphere through the main valve 1. Then, the program returns to the main program and opens the pressure P in the fault state. g The comparison points are looped.

[0079] When the pressure P of the pressure vessel rises to the opening pressure P 开 Fault condition opening pressure P g During normal operation, solenoid valves (DF1) 21 and (DF2) 22 are energized, while solenoid valve (DF3) 23 is de-energized. If solenoid valve (DF1) 21 fails to operate despite being energized, refer to [the relevant documentation]. Figure 8 As shown, the gas inside the pressure vessel still enters the pneumatic control chamber 13 of the main valve 1 through valve island 2. Simultaneously, the gas in the pneumatic control chamber 13 of the main valve 1 cannot be discharged to the atmosphere through valve island 2, causing the main valve 1 to fail to open, resulting in an opening failure. The pressure P in the pressure vessel continues to rise; when the pressure P continues to rise to a level greater than the opening pressure P under the failure condition... gAt this point, the program determines that an opening fault has occurred and executes the fault branch program. This fault branch program de-energizes solenoid valves (DF1) 21 and (DF2) 22, while energizing solenoid valve (DF3) 23. See [link / description here]. Figure 9 As shown, the gas in the pressure vessel cannot enter the pneumatic control chamber 13 of the main valve 1 through the valve island 2. At the same time, the gas in the pneumatic control chamber 13 of the main valve 1 is discharged to the atmosphere through the valve island 2. The gas pressure in the venting channel of the main valve 1 overcomes the spring force of the spring 17 and causes the valve disc 15 of the main valve 1 to open, and quickly open to the maximum opening. The gas in the pressure vessel is discharged to the atmosphere through the venting channel of the main valve 1 to prevent the gas pressure in the pressure vessel from continuing to rise. The fault recovery is successful. Then the program returns to the program point of pressure comparison in the fault branch program for looping.

[0080] During the execution of the fault branch procedure, the pressure vessel pressure P drops to the shut-off pressure P. 关 Fault condition opening pressure P g During this period, the fault branch program controls solenoid valves (DF1) 21 and (DF2) 22 to be de-energized, while solenoid valve (DF3) 23 remains in the previous energized state. That is, solenoid valves (DF1) 21 and (DF2) 22 are de-energized, while solenoid valve (DF3) 23 is energized. At this time, main valve 1 remains open, continuing to exhaust gas from the pressure vessel.

[0081] During the execution of the fault branch procedure, the pressure vessel pressure P drops below the shut-off pressure P. 关 When the faulty branch program controls solenoid valves (DF1) 21, (DF2) 22, and (DF3) 23 to be de-energized, refer to [the relevant documentation]. Figure 7 As shown, when main valve 1 is closed, the gas inside the pressure vessel can no longer be discharged to the atmosphere through main valve 1. Then the program returns to the main program and opens the pressure P in the fault state. g The comparison points are looped through;

[0082] Similarly, when the pressure P of the pressure vessel rises to the opening pressure P... 开 Fault condition opening pressure P g During normal operation, the normal branch program controls solenoid valves (DF1) 21 and (DF2) 22 to be energized, while solenoid valve (DF3) 23 is de-energized. If solenoid valve (DF2) 22 malfunctions due to energization failure, the faulty branch program controls solenoid valves (DF1) 21 and (DF2) 22 to be de-energized, while solenoid valve (DF3) 23 is energized. The program can still perform remedial actions. See details below. Figure 10 , Figure 11 As shown;

[0083] When the pressure vessel pressure P drops below the closing pressure P 关During normal branching, solenoid valves (DF1) 21, (DF2) 22, and (DF3) 23 are not energized. If solenoid valve (DF1) 21 experiences a power failure and fails to return to its original position, refer to [the relevant documentation]. Figure 12 As shown, it can still ensure that the gas in the pressure vessel enters the pneumatic control chamber 13 of the main valve 1 through valve island 2. At the same time, the gas in the pneumatic control chamber 13 of the main valve 1 can no longer be discharged to the atmosphere through valve island 2. The valve disc 15 of the main valve 1 closes under the combined action of the gas pressure in the pneumatic control chamber 13 and the spring force of spring 17. That is, the main valve 1 is closed, and the gas in the pressure vessel can no longer be discharged to the atmosphere through the main valve 1. Then the program returns to the main program and opens the pressure P in the fault state. g The comparison points are looped through;

[0084] Similarly, when the pressure P in the pressure vessel drops below the closing pressure P... 关 During normal operation, solenoid valves (DF1) 21, (DF2) 22, and (DF3) 23 are not energized. If solenoid valve (DF2) 22 fails to return to its original position after being de-energized, the main valve 1 will still remain closed. See details... Figure 13 As shown.

[0085] This embodiment also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the above-described control method.

[0086] A computer-readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implement the steps of the method described above.

[0087] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0088] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

Claims

1. An electrically controlled safety valve, characterized in that: It includes a main valve (1), a valve island (2), a controller (3) and a pressure sensor (4). The main valve (1) is provided with a pneumatic control chamber (13), an air inlet (11) and an air outlet (12). The air inlet (11) is connected to the pressure vessel, and the air outlet (12) is directly connected to the atmosphere. When the pneumatic control chamber (13) is pressurized, the air outlet (12) is closed, and the main valve (1) is in the closed state. When the pneumatic control chamber (13) is depressurized, the air inlet (11) and the air outlet (12) are connected, and the main valve (1) is in the open state. The valve island (2) is provided with a normally open outlet A, an inlet P, a normally closed vent T2 and a normally closed vent T3. The pneumatic control chamber (13) is connected to the normally open outlet A. The valve island inlet P is connected to the pressure vessel. The normally closed vent T2 and normally closed vent T3 are both open to the atmosphere. The controller (3) is connected to the valve island (2), and the pressure sensor (4) is used to measure the pressure P inside the pressure vessel and transmit the pressure P of the pressure vessel to the controller (3); The controller (3) compares the pressure P of the pressure vessel with the preset safety valve opening and closing pressure value, and controls the inflation or deflation pressure of the main valve pneumatic control chamber (13) by controlling the valve island (2); The valve island includes three normally open two-position three-way solenoid valves, namely solenoid valve DF1, solenoid valve DF2 and solenoid valve DF3. Solenoid valve DF1, solenoid valve DF2 and solenoid valve DF3 are all connected to the controller (3). The controller (3) is used to control solenoid valve DF1, solenoid valve DF2 and solenoid valve DF3 to be in an energized state or an unenergized state. Solenoid valve DF1 has a normally open outlet port A1, an inlet port P1, and a normally closed vent port T1. When energized, the normally open outlet port A1 and the normally closed vent port T1 are connected, while the inlet port P1 is disconnected. When de-energized, the normally open outlet port A1 and the inlet port P1 are connected, while the normally closed vent port T1 is disconnected. Solenoid valve DF2 has a normally open outlet port A2, an inlet port P2, and a normally closed vent port T2. When energized, the normally open outlet port A2 and the normally closed vent port T2 are connected... When the valve is powered on, the inlet P2 is disconnected. When the valve is de-energized, the normally open outlet A2 is connected to the inlet P2, and the normally closed vent T2 is disconnected. The solenoid valve DF3 has a normally open outlet A3, an inlet P3, and a normally closed vent T3. When the valve is powered on, the normally open outlet A3 and the normally closed vent T3 are connected, and the inlet P3 is disconnected. When the valve is de-energized, the normally open outlet A3 and the inlet P3 are connected, and the normally closed vent T3 is disconnected. Normally open vent A is connected to normally open vent A1, vent P1 is connected to normally open vent A3, vent P2 and vent P3 are connected to the pressure vessel, and normally open vent A2 is connected to normally closed vent T1.

2. The electrically controlled safety valve according to claim 1, characterized in that: The main valve (1) includes a valve body (14), a valve disc (15) and a bellows (16). An air inlet (11) and an air outlet (12) are located on the valve body (14). One end of the bellows (16) is connected to the inner wall of the main valve (1) and the other end is connected to the valve disc (15). When the valve disc (15) contacts the air outlet (12), the main valve (1) closes, and a pneumatic control chamber (13) is formed inside the bellows (16).

3. The electrically controlled safety valve according to claim 2, characterized in that: The main valve (1) also includes a spring (17), one end of which is connected to the inner wall of the main valve (1) and the other end is connected to the valve disc (15) to supplement the sealing force required for the valve disc (15) to seal under low pressure.

4. An electrically controlled safety valve according to claim 2, characterized in that: The main valve (1) also includes a limiting ring (18), which is located inside the bellows (16). One end of the limiting ring (18) is connected to the inner wall of the main valve (1) to limit the valve disc (15).

5. An electrically controlled safety valve according to claim 4, characterized in that: The height of the limiting ring (18) is adjustable so that the maximum opening of the main valve (1) is adjustable.

6. A control method for an electrically controlled safety valve according to any one of claims 1-5, characterized in that, include: S1: Set the shut-off pressure P from low to high according to the pressure control requirements. 关 1. Open pressure P 开 Open pressure P under fault condition g ; S2: Set the pressure vessel pressure P to the fault condition opening pressure P. g A comparison is made when the pressure vessel pressure P is less than the fault-condition opening pressure P. g If the opening is normal, execute the normal branch program of S3; otherwise, if the opening is faulty, execute the faulty branch program of S4. S3: The normal branch procedure includes: comparing the pressure vessel pressure P with the shutdown pressure P. 关 1. Open pressure P 开 Compare; When the pressure vessel pressure P is less than the closing pressure P 关 When the solenoid valves DF1, DF2, and DF3 are de-energized, the system returns to S2. When the pressure P of the pressure vessel is greater than the opening pressure P 开 When the solenoid valves DF1 and DF2 are energized, the solenoid valve DF3 is not energized. At this time, the main valve (1) is opened, and the gas in the pressure vessel is discharged to the atmosphere through the vent (12) and returns to S2. When the pressure P of the pressure vessel is at the closing pressure P 关 and opening pressure P 开 During this period, control solenoid valves DF1 and DF2 remain in the previous energized state, which is either energized or de-energized. Solenoid valve DF3 is de-energized, and the process returns to S2. S4: Fault branch procedure includes: comparing pressure vessel pressure P with shutdown pressure P. 关 Fault condition opening pressure P g The comparison showed that the pressure vessel pressure P was greater than the fault-condition opening pressure P. g At that time, S41 is performed, and the comparison result shows that the pressure vessel pressure P is at the closing pressure P. 关 Open pressure P under fault condition g During this period, S42 is performed, and the comparison result shows that the pressure vessel pressure P is less than the closing pressure P. 关 At that time, proceed with S43; S41: Control solenoid valves DF1 and DF2 to be de-energized, solenoid valve DF3 to be energized, return to S4; S42: Control solenoid valves DF1 and DF2 to be de-energized, solenoid valve DF3 remains in the previous energized state, and return to S4; S43: Control solenoid valves DF1, DF2, and DF3 to de-energize, then return to S2.

7. The control method according to claim 6, characterized in that, The energizing states of solenoid valves DF1 and DF2 as described in S3 when maintaining the previous energizing state include: The pressure vessel pressure P rises to the shut-off pressure P 关 and opening pressure P 开 When the pressure vessel pressure P is between these values, the pressure P is at the closing pressure P. 关 and opening pressure P 开 The previous state was when the pressure vessel pressure P was less than the closing pressure P. 关 At this time, solenoid valves DF1 and DF2 remain de-energized; The pressure vessel pressure P drops to the shut-off pressure P 关 and opening pressure P 开 When the pressure vessel pressure P is between these values, the pressure P is at the closing pressure P. 关 and opening pressure P 开 The previous state was when the pressure vessel pressure P was greater than the opening pressure P. 开 Solenoid valves DF1 and DF2 remain energized; The energized state of the control solenoid valve DF3 as described in S42 when it maintains the previous energized state includes: The pressure vessel pressure P rises to the shut-off pressure P 关 Open pressure P under fault condition g When the pressure vessel pressure P is between these values, the pressure P is at the closing pressure P. 关 Open pressure P under fault condition g The previous state was when the pressure vessel pressure P was less than the closing pressure P. 关 At this time, solenoid valve DF3 remains de-energized; The pressure vessel pressure P drops to the shut-off pressure P 关 Open pressure P under fault condition g When the pressure vessel pressure P is between these values, the pressure P is at the closing pressure P. 关 Open pressure P under fault condition g The previous state was when the pressure vessel pressure P was greater than the fault-state opening pressure P. g At this time, solenoid valve DF3 remains energized.

8. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method described in any of claims 6-7.

9. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method described in any of claims 6-7.

Images