A system and method for testing an airpath control system

Abstract

The utility model relates to a kind of system and method for testing gas circuit control system, involve gas circuit test technical field, including filter C, pressure regulator, pressure relief valve, solenoid valve, gas cylinder A and gas cylinder B, valve a, pressure regulator, input gas pressure gauge, valve b, gas circuit pressure gauge, valve c are sequentially equipped in pipeline A between filter C and gas cylinder A, pipeline A between valve b, valve c is connected with pipeline B, the lower end of pipeline B is communicated with pipeline C, and the upper end is connected with the measuring point A of pneumatic servo mechanism;Valve e and solenoid valve are sequentially equipped on pipeline B, pipeline D is communicated between the communication place of pipeline A, pipeline B and valve e, and pipeline D is connected with the measuring point B of pneumatic servo mechanism;Valve d is equipped on pipeline D;Valve i, pressure relief valve, air-tightness test pressure gauge A, intercepting nozzle A, air-tightness test pressure gauge B, one-way valve C, valve f are sequentially equipped on pipeline C;The utility model has high work efficiency, strong reliability, meets the use requirement.

Description

Technical Field

[0001] This invention relates to the field of gas circuit testing technology, and in particular to a system and method for testing gas circuit control systems. Background Technology

[0002] Servo mechanisms, used to adjust the flight attitude of aircraft, are mainly classified into pneumatic servo mechanisms, hydraulic servo mechanisms, and electric servo mechanisms according to their control methods. Among them, pneumatic servo mechanisms are characterized by their relatively simple structure and fast response time, and are used in aircraft to a certain extent. A typical pneumatic servo mechanism mainly includes a pneumatic control system, an electrical control system, a body, cylinders and pistons, a rotating shaft, and other mechanical structures. The pneumatic control system is shown in the attached figure. Figure 1 As shown, the system consists of test inlet 1, first filter 2a, second filter 2b, pressure reducing valve 3, check valve A4, check valve B6, timing valve 8, refrigeration control valve 5, and five sets of switching valves. The flow direction of the refrigeration gas path is as follows: nitrogen enters from the input refrigeration port, passes through the refrigeration control valve 5, exits from the output refrigeration port, and then flows downward through check valve A4 and then to the right, passing through switching valve A7 to enter other branches. Switch valve A7 is a normally open two-position two-way valve. The flow direction of the working gas path is as follows: nitrogen enters from the left end through the first filter 2a. Alternatively, gas from test inlet 1 passes through another second filter 2b to the inlet of pressure reducing valve 3. After pressure reduction and output, one path passes through check valve B6 to the right-side switch valve A7 to reach other branches, while the other path passes through timing valve 8 and then downwards into switch valves B9, C10, D11, and E12. The gas from the output ends of switch valves B9, C10, D11, and E12 enters the piston chambers of cylinders A, B, C, and D, respectively.

[0003] Switching valves B9, C10, D11, and E12 are all two-position three-way solenoid valves, and their structures are shown in the attached diagram. Figure 2 As shown, each switching valve includes a coil A13, a spring 14, a valve seat 15, a plunger A17, and an O-ring 16. When not in operation, the input gas pressure, under the action of the spring 14, cannot flow into the output end through the sealing surface between the right end of the plunger A17 and the valve seat 15. When the switching valve is energized, the plunger A17 moves to the left against the spring force, and the sealing block at the left end of the plunger A17 seals the left end of the cavity in the middle of the valve seat 15, allowing the input gas to communicate with the output gas. The output gas then enters the piston chambers of the four cylinders, causing the pistons to rotate. Simultaneously, when the switching valve is de-energized, the plunger A17 moves to the left, and the right end of the plunger A17 returns to its original state, cutting off the input gas. At this time, the output gas communicates with the center hole at the left end and is discharged into the atmosphere. At this time, the pressure in the piston chamber of the cylinder is zero relative to the air pressure, i.e., it is connected to the atmosphere, and the rotating shaft stops rotating, completing one action.

[0004] Refrigeration control valve 5 is a two-position two-way solenoid valve, as shown in the attached document. Figure 3 As shown, the system includes a conical spring 18, a valve connector 19, a plunger B20, and a coil B21. When not in operation, the gas inlet pressure is input through the refrigeration input port. Under the action of the conical spring 18, the gas cannot pass through the sealing surface between the left end of the plunger B20 of the refrigeration control valve 5 and the valve connector 19 to enter the gas outlet. When the refrigeration control valve 5 is energized, the plunger B20 of the refrigeration control valve 5 moves to the right against the force of the conical spring 18, and the gas inlet and gas outlet are the same, so the gas is output and refrigeration is achieved.

[0005] The timing valve 8 is a two-position normally closed valve. After a certain set time of gas introduction, it becomes normally open. When the timing valve 8 is normally open, the gas flows through the timing valve 8 into the switching valves B9, C10, D11, and E12.

[0006] Currently, for the above-mentioned pneumatic control system, there is a need to design a testing system and testing method that can test the airtightness of the refrigeration control valve, the performance of the pressure reducing valve, the working performance of the switching valve, the working performance of the pneumatic control system, and the overall airtightness of the pneumatic control system. This has become a basic requirement for those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a system and method for testing a pneumatic control system.

[0008] The technical solution adopted in this invention is:

[0009] A system for testing a pneumatic control system includes a filter C, a pressure regulator, a pressure relief valve, a solenoid valve, gas cylinder A, and gas cylinder B. On pipeline A between filter C and gas cylinder A, valve a, a pressure regulator, an input pressure gauge, valve b, a pneumatic pressure gauge, and valve c are sequentially installed. Pipeline B connects to the section between valves b and c. The lower end of pipeline B is connected to pipeline C, and the upper end is connected to the measuring point A of a pneumatic servo mechanism. Valve e and a solenoid valve are sequentially installed on pipeline B. Pipeline D connects to valve e at the junction of pipelines A and B. Pipeline D is connected to the measuring point B of the pneumatic servo mechanism. Valve d is installed on pipeline D. Pipeline C is equipped with valve i, pressure relief valve, air tightness test pressure gauge A, shut-off nozzle A, air tightness test pressure gauge B, one-way valve C, and valve f in sequence. The measuring point C of the pneumatic servo mechanism is connected to gas cylinder B through pipeline E. Pipeline E is equipped with valve g, valve h, pressure protector, and leak detection pressure gauge in sequence.

[0010] The system for testing the pneumatic control system has one end of pipe C connected to pipe A and located between the input pressure gauge and valve b, and the lower end of pipe B connected between check valve C and valve f.

[0011] The system for testing the gas circuit control system is provided with a pressure sensor on the pneumatic servo mechanism.

[0012] The system for testing the gas circuit control system is provided with a cut-off nozzle B on the valve g.

[0013] A testing method for testing a gas circuit control system, comprising airtightness testing of a refrigeration control valve in the gas circuit control system, performance testing of a pressure reducing valve, working performance testing of a switch valve, working performance testing of the gas circuit control system, and overall airtightness testing of the gas circuit control system, a measurement point C of the pneumatic servo mechanism is communicated with the switch valve A in the gas circuit control system, a measurement point A is communicated with a nitrogen inlet at a left end of the gas circuit control system, a measurement point B is connected with an input refrigeration port of the gas circuit control system, and a stop valve is arranged on an output refrigeration port and is in a stop state, the switch valve A is in a normally open state during testing, and the testing method comprises the following steps:

[0014] S1, airtightness testing of the refrigeration control valve

[0015] Valves a, b and d are opened, valves i, f, h, e and c are closed, valve g is adjusted from a middle position to a lower position to be in an open state, and is communicated with a pressure protector, a leak detection pressure gauge and a gas cylinder B, at this time, pressure passes through a filter C, valves a, b and d to the measurement point B in sequence, is input to the refrigeration control valve in the gas circuit control system, and the refrigeration control valve is in a closed state, if there is a gas leak, the gas enters the measurement point C through a one-way valve A and the switch valve A, is output to the valve g and the leak detection pressure gauge, the pressure of the pressure regulator is adjusted to P1 MPa, pressure is maintained for t minutes, and the pressure of the leak detection pressure gauge does not decrease by more than ΔP1 MPa, at this time, it is indicated that the refrigeration control valve is qualified under the pressure P1.

[0016] S2, performance testing of the pressure reducing valve

[0017] Valves a, b and h are opened, valves i, f and d are closed, valve g is in a closed state at the middle position, the pressure of the pressure regulator is adjusted to P2 MPa, valve c is slowly opened, valve e and an electromagnetic valve are opened, and the gas enters the measurement point A through the filter C, valves a, b, e and the electromagnetic valve in sequence, the gas entering the measurement point A passes through a nitrogen inlet at a left end of the gas circuit control system, a first filter, the pressure reducing valve, a one-way valve B and the switch valve A in sequence, is output from the measurement point C of the pneumatic servo mechanism, and the output pressure of the pressure reducing valve in the gas circuit control system is tested by the pressure sensor, and the output pressure does not change by more than ΔP2 MPa, which is qualified.

[0018] S3, working performance testing of the switch valve

[0019] The switch valve B, the switch valve C, the switch valve D, the switch valve E are normally working, the valve a, the valve b, the valve h are opened, the valve i, the valve f, the valve d are closed, the pressure of the pressure regulator is adjusted to P4 MPa, the valve c, the valve e are opened, the gas passes through the filter C, the valve a, the valve b, the valve e, the electromagnetic valve in turn and enters the measuring point A, the gas entering the measuring point A passes through the first filter, the pressure reducing valve, the check valve B, the switch valve A in turn and is output from the measuring point C; the gas entering the measuring point A also passes through the first filter, the pressure reducing valve, the timing valve and enters the switch valve B, the switch valve C, the switch valve D, the switch valve E; the valve g is in the open state of the upper position, the gas communicates with the cut-off nozzle B, the cut-off nozzle B simulates the pressure load, at this time, the electromagnetic coils of the switch valve B, the switch valve C, the switch valve D, the switch valve E in the gas circuit control system are inputted with step signals respectively, the opening and closing of the switch valve B, the switch valve C, the switch valve D, the switch valve E are controlled, the P4 MPa pressure is output through the output end of the switch valve B, the switch valve C, the switch valve D, the switch valve E, the gas enters the piston cavity of the cylinder A, the cylinder B, the cylinder C, the cylinder D respectively, the piston drives the rotating shaft of the crank connecting rod structure and the elastic load added on the rotating shaft to rotate, at this time, the current change time of the switch valve B, the switch valve C, the switch valve D, the switch valve E coil is collected and measured, whether the response time of the switch valve B, the switch valve C, the switch valve D, the switch valve E is qualified is judged;

[0020] S4, performance test of the gas circuit control system

[0021] Open valve a, valve b, valve h, close valve i, valve f, valve d, adjust the pressure of the pressure regulator to P3 MPa, open valve c, valve e, the gas passes through filter C, valve a, valve b, valve e, electromagnetic valve in turn after entering the measuring point A, valve g is in the upper position of the open state, communicated with the cutting nozzle B, the gas entering the measuring point A passes through the left end of the gas path control system nitrogen inlet, the first filter, pressure reducing valve, check valve B, on-off valve A in turn, the gas is output from the measuring point C of the pneumatic servo mechanism to the cutting nozzle B to simulate the pressure load; the gas entering the measuring point A also passes through the first filter, pressure reducing valve, check valve B, timing valve into on-off valve B, on-off valve C, on-off valve D, on-off valve E in turn, at this time, the electromagnetic coils of on-off valve B, on-off valve C, on-off valve D, on-off valve E in the gas path control system are input PWM signals, high frequency control on-off valve B, on-off valve C, on-off valve D, on-off valve E open and close, P3 MPa pressure through the output end of on-off valve B, on-off valve C, on-off valve D, on-off valve E gas respectively enters the piston cavity of cylinder A, cylinder B, cylinder C, cylinder D, the piston drives the rotating shaft of the crank connecting rod structure and the elastic load added on the rotating shaft to rotate in one direction or two directions; the rotating shaft is connected with the analog load and the coaxial feedback potentiometer, the instantaneous time change of the rotating shaft and the corresponding instantaneous angular position change are detected through the feedback potentiometer voltage change signal, and whether the time change and the corresponding instantaneous angular position change are qualified is judged, and then the working performance of the gas path control system is tested;

[0022] S5、test the overall gas tightness of the gas path control system

[0023] Close valve b, valve c, valve f, valve d, valve h, open valve a, valve e, valve i, valve g to the closed state of the middle position, the gas through filter C, valve a, pressure regulator, valve i, gas tightness test pressure gauge A, cut-off nozzle A, gas tightness test pressure gauge B, check valve C, valve e, electromagnetic valve in turn into the measuring point A, that is, into the first filter, pressure reducing valve, check valve B, check valve A, timing valve, on-off valve A, on-off valve B, on-off valve C, on-off valve D, on-off valve E in the left end of the gas path control system, adjust the pressure of the pressure regulator to P5 MPa, at this time the whole gas path control system is in the same state as measuring point A and isolated from the atmosphere; if any gas valve in the gas path control system, such as pressure reducing valve, check valve B, check valve A, timing valve, on-off valve A, on-off valve B, on-off valve C, on-off valve D, on-off valve E, check valve near the test inlet and cut-off valve at the output refrigeration appears leakage, the pressure values of gas tightness test pressure gauge B and gas tightness test pressure gauge A are inconsistent; after stable work, if the difference between gas tightness test pressure gauge B and gas tightness test pressure gauge A is not more than ΔP5 MPa, it indicates that the overall gas tightness test of the pneumatic servo mechanism is qualified; during the test, the sealing test of on-off valve B, on-off valve C, on-off valve D and on-off valve E respectively when they are opened and closed needs to be carried out.

[0024] The test method of the system for testing the gas path control system, in step S3, the standard for judging whether the response time of on-off valve B, on-off valve C, on-off valve D and on-off valve E is qualified is: under the simulated load, whether the time Δt1 when the current changes from 0 to I1 when the valve core is attracted by the energized coil of on-off valve B, on-off valve C, on-off valve D and on-off valve E is ≤t1, and whether the time Δt2 when the current changes from I1 to 0 when the valve core is released by the de-energized coil is ≤t2; yes for qualified, no for unqualified, wherein, Δt 1、 Δt2 is the actual response time, t 1、 t2 is the set allowable response time.

[0025] The test method of the system for testing the gas path control system, in step S4, when testing the working performance of the gas path control system, the method for testing the performance of the timing valve is: the electromagnetic valve is started as the timing zero point, and the opening time is recorded as t3; under the condition that on-off valve B is pre-energized, the response time t4 of the gas pushing the piston to drive the rotating shaft and the feedback potentiometer is recorded through the first filter, pressure reducing valve, check valve B, timing valve and on-off valve B, whether the difference Δty between t4 and t3 meets the pre-set value to judge the performance of the timing valve, yes for qualified, no for unqualified.

[0026] In the test method for the system of testing the gas circuit control system, during the overall air tightness test of the gas circuit control system in step S5, a pressure relief valve is connected to the pipeline C between valve i and the air tightness test pressure gauge A to ensure that the pressure of pipeline C is within the set range.

[0027] Due to the adoption of the technical solution described above, the present invention has the following advantages:

[0028] The system and method for testing pneumatic control systems described in this invention can perform airtightness testing on cooling control valves, performance testing on pressure reducing valves, performance testing on switching valves, performance testing on the pneumatic control system, and overall airtightness testing on existing pneumatic servo mechanisms. It is highly efficient, reliable, and meets the requirements for use. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the air circuit control system in an existing pneumatic servo mechanism;

[0030] Figure 2 This is a schematic diagram of the internal structure of the switching valve in the pneumatic control system;

[0031] Figure 3 This is a schematic diagram of the internal structure of the cooling control valve in the gas circuit control system;

[0032] Figure 4 This is a schematic diagram of the test principle of the gas circuit control system of this invention.

[0033] In the diagram: 1. Test inlet; 2a. First filter; 2b. Second filter; 3. Pressure reducing valve; 4. Check valve A; 5. Cooling control valve; 6. Check valve B; 7. Switch valve A; 8. Timing valve; 9. Switch valve B; 10. Switch valve C; 11. Switch valve D; 12. Switch valve E; 13. Coil A; 14. Spring; 15. Valve seat; 16. O-ring; 17. Plunger A; 18. Conical spring; 19. Valve connector; 20. Plunger B; 21. Coil B; 22. Filter C; 23. Valve a; 24. Pressure regulator; 25. Input pressure gauge; 26. Valve b; 27. Air path 28. Pressure gauge; 29. ​​Valve c; 30. Gas cylinder A; 31. Valve f; 32. Check valve C; 33. Air tightness test pressure gauge B; 34. Air tightness test pressure gauge A; 35. Pressure relief valve; 36. Valve i; 37. Valve d; 38. Valve e; 39. Solenoid valve; 40. Pneumatic servo mechanism; 41. Pressure sensor; 42. Cut-off nozzle B; 43. Pressure protector; 44. Valve h; 45. Leak detection pressure gauge; 46. Gas cylinder B; 47. Cut-off nozzle A; 48. Pipeline A; 49. Pipeline B; 50. Pipeline C; 51. Pipeline D; 52. Pipeline E. Detailed Implementation

[0034] The present invention will be further explained and described below with reference to the accompanying drawings and embodiments. However, this should not be construed as limiting the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0035] Combined with appendix Figure 4 The system for testing the pneumatic control system includes a filter C22, a pressure regulator 24, a pressure relief valve 34, a solenoid valve 38, a gas cylinder A29, and a gas cylinder B46. On the pipeline A48 between the filter C22 and the gas cylinder A29, valves a23, 24, an input pressure gauge 25, b26, 27, and c28 are sequentially installed. Pipeline B49 connects to the pipeline between valves b26 and c28. The lower end of pipeline B49 is connected to pipeline C50, and the upper end is connected to the measuring point A of the pneumatic servo mechanism 39. Valve e37 and a solenoid valve are sequentially installed on pipeline B49. 38. Pipeline D51 connects the junction of pipelines A48 and B49 to valve e37. Pipeline D51 is connected to the measuring point B of the pneumatic servo mechanism 39. Valve d36 is installed on pipeline D51. Pipeline C50 is sequentially equipped with valve i35, pressure relief valve 34, air tightness test pressure gauge A33, shut-off nozzle A47, air tightness test pressure gauge B32, one-way valve C31, and valve f30. The measuring point C of the pneumatic servo mechanism 39 is connected to gas cylinder B46 through pipeline E52. Pipeline E52 is sequentially equipped with valve g41, valve h44, pressure protector 43, and leak detection pressure gauge 45.

[0036] Specifically, one end of pipe C50 is connected to pipe A48 and is located between the input pressure gauge 25 and valve b26, while the lower end of pipe B49 is connected between check valve C31 and valve f30.

[0037] Specifically, a pressure sensor 40 is provided on the pneumatic servo mechanism 39.

[0038] Specifically, a flow-blocking nozzle B42 is provided on valve g41.

[0039] Combined with appendix Figures 1-4 The method for testing the pneumatic control system includes testing the airtightness of the cooling control valve, the performance of the pressure reducing valve, the working performance of the switching valve, the working performance of the pneumatic control system, and the overall airtightness of the pneumatic control system. The measurement point C of the pneumatic servo mechanism 39 is connected to... Figure 1 The on / off valve A7 in the gas circuit control system is connected, and the measuring point A is connected to... Figure 1The nitrogen inlet on the left side of the gas path control system is connected. Measurement point B is connected to the input cooling port of the gas path control system. The output cooling port is equipped with a shut-off valve, which is in the shut-off state. When output cooling is applied, the shut-off valve is in the open state. During testing, the switch valve A7 is in the normally open state. The specific steps include:

[0040] S1, Air tightness test of refrigeration control valve 5

[0041] Open valves a23, b26, and d36; close valves i35, f30, h44, e37, and c28. Adjust valve g41 from the middle position to the lower position to open it, connecting it to pressure protector 43, leak gauge 45, and gas cylinder B46. At this time, pressure passes sequentially through filter C22, valve a23, valve b26, and valve d36 to measuring point B, and is input to the refrigeration control valve 5 in the gas circuit control system. The refrigeration control valve 5 is in the closed state. If there is a leak, the gas passes through check valve A4 and switch valve A7 to enter measuring point C; it is output to valve g41 and leak gauge 45. Adjust the pressure of regulator 24 to P1MPa, hold the pressure for t minutes, and if the pressure drop of leak gauge 45 is not greater than ΔP1MPa, it indicates that the refrigeration control valve 5 is qualified under the action of pressure P1.

[0042] S2, Performance test of pressure reducing valve

[0043] Open valves a23, b26, and h44; close valves i35, f30, and d36; place valve g41 in the closed position (middle position); adjust the pressure of regulator 24 to P2MPa; slowly open valve c28; open valve e37 and solenoid valve 38; the gas passes through filter C22, valve a23, valve b26, valve e37, and solenoid valve 38 in sequence before entering measurement point A; the gas entering measurement point A passes through the nitrogen inlet at the left end of the gas path control system, the first filter 2a, pressure reducing valve 3, check valve B6, and switch valve A7 in sequence; and is output from measurement point C of pneumatic servo mechanism 39. The pressure sensor 40 tests the output pressure of pressure reducing valve 3 in the gas path control system; the output pressure change is not greater than ΔP2MPa to be considered qualified.

[0044] S3. Performance test of the switching valve

[0045] Switch valves B9, C10, D11, and E12 operate normally. Valves a23, b26, and h44 are opened, while valves i35, f30, and d36 are closed. The pressure of regulator 24 is adjusted to P4MPa. Opening valves c28 and e37 allows the gas to pass sequentially through filter C22, valve a23, valve b26, valve e37, and solenoid valve 38 before entering measuring point A. The gas entering measuring point A then passes sequentially through the first filter 2a, pressure reducing valve 3, and check valve B6. Switch valve A7 outputs from measuring point C; the gas entering measuring point A also sequentially passes through the first filter 2a, pressure reducing valve 3, and timing valve 8 before entering switch valves B9, C10, D11, and E12; valve g41 is in the open position at the top, and the gas is connected to the choke nozzle B42, which simulates a pressure load. At this time, step signals are input to the solenoid coils of switch valves B9, C10, D11, and E12 in the gas circuit control system, controlling switch valve B9. The opening and closing of switching valves C10, D11, and E12 allows gas at a pressure of P4MPa to flow through the output terminals of switching valves B9, C10, D11, and E12 into the piston chambers of cylinders A, B, C, and D, respectively. The pistons drive the crankshaft and the elastic load on it to rotate. During this process, the time of current change in the coils of switching valves B9, C10, D11, and E12 is collected and measured to determine the operation of switching valves B9 and C11. 0. Are the response times of switching valves D11 and E12 up to standard? The standard for judging whether the response times of switching valves B9, C10, D11, and E12 are up to standard is: under simulated load, when the coils of switching valves B9, C10, D11, and E12 are energized and the valve cores are engaged, is the time Δt1 for the current to change from 0 to I1 ≤ t1? And when the coils are de-energized and the valve cores are released, is the time Δt2 for the current to change from I1 to 0 ≤ t2? If yes, it is up to standard; otherwise, it is down to standard. Where Δt... 1、 Δt2 is the actual response time, t 1、 t2 is the set allowable response time;

[0046] S4. Performance test of the gas circuit control system

[0047] Open valves a23, b26, and h44; close valves i35, f30, and d36; adjust the pressure of regulator 24 to P3MPa; open valves c28 and e37; the gas passes sequentially through filter C22, valve a23, valve b26, valve e37, and solenoid valve 38 before entering measurement point A; valve g41 is in the open position at the top, communicating with the shut-off nozzle B42; the gas entering measurement point A passes sequentially through the nitrogen inlet at the left end of the gas path control system, the first filter 2a, pressure reducing valve 3, and single... Gas is output from measuring point C of pneumatic servo mechanism 39 via valve B6 and switching valve A7, and flows to throttling nozzle B42 to simulate pressure load. Gas entering measuring point A also sequentially passes through first filter 2a, pressure reducing valve 3, one-way valve B6, and timing valve 8 into switching valves B9, C10, D11, and E12. At this time, PWM signals are input to the solenoid coils of switching valves B9, C10, D11, and E12 in the gas circuit control system, respectively, to control the switching valves B9, C10, D11, and E12 at high frequency. The opening and closing of valves D11 and E12 allows the P3MPa pressure gas to enter the piston chambers of cylinders A, B, C, and D respectively through the output terminals of valves B9, C10, D11, and E12. The pistons drive the crankshaft and the elastic load on it to rotate in one or opposite directions. The shaft is connected to a simulated load and a coaxial feedback potentiometer. The instantaneous time change and corresponding instantaneous angular position change of the shaft are detected by the voltage change signal from the feedback potentiometer. Based on the time change and the corresponding instantaneous... The performance of the pneumatic control system is tested by checking whether the rotation angle position is qualified. The method for testing the performance of the timing valve 8 is as follows: the start of the solenoid valve 38 is the zero point of timing, and the opening time is recorded as t3. With the switching valve B9 pre-energized, the response time of the gas passing through the first filter 2a, pressure reducing valve 3, one-way valve B6, timing valve 8, and switching valve B9 to push the piston, drive the rotating shaft, and activate the feedback potentiometer is recorded as t4. The performance of the timing valve 8 is judged by whether the difference Δty between t4 and t3 meets the preset value. If it is qualified, it is qualified; otherwise, it is unqualified.

[0048] S5. Overall airtightness test of the air circuit control system.

[0049] Close valves b26, c28, f30, d36, and h44; open valves a23, e37, and i35; and close valve g41 to its middle closed position. Gas sequentially passes through filter C22, valve a23, pressure regulator 24, valve i35, airtightness test pressure gauge A33, shut-off nozzle A47, airtightness test pressure gauge B32, check valve C31, valve e37, and solenoid valve 38 before entering measurement point A. This point then enters the left-hand side of the gas control system, passing through the first filter 2a, pressure reducing valve 3, check valve B6, check valve A4, timing valve 8, switching valve A7, switching valve B9, switching valve C10, switching valve D11, and switching valve E12. The pressure regulator 24 is adjusted to P5MPa. At this point, the entire gas control system is in the same state as measurement point A, isolated from the atmosphere. If the pressure reducing valve 3, check valve B6, and check valve A4 in the gas control system... If any of the following valves leaks: timing valve 8, switching valve A7, switching valve B9, switching valve C10, switching valve D11, switching valve E12, the one-way valve near test inlet 1, and the shut-off valve at the output cooling outlet, the pressure of the airtightness test pressure gauge B32 will be inconsistent with that of the airtightness test pressure gauge A33. After the operation stabilizes, if the difference between the airtightness test pressure gauge B32 and the airtightness test pressure gauge A33 is not greater than ΔP5MPa, it indicates that the overall airtightness test of the pneumatic servo mechanism 39 is qualified. During the test, it is also necessary to conduct a sealing test on the opening and closing control of switching valves B9, C10, D11, and E12, that is, to check the seal between the left and right ends of plunger A17 and valve seat 15. A pressure relief valve 34 is connected to the pipeline C50 between valve i35 and airtightness test pressure gauge A33 to ensure that the pressure of pipeline C50 is within the set range.

[0050] The parts of this invention not described in detail are prior art.

[0051] The embodiments selected herein for the purpose of disclosing the inventive objectives are currently considered suitable; however, it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of this concept and invention.

Claims

1. A system for testing a gas circuit control system, comprising a filter C, a pressure regulator, a pressure relief valve, a solenoid valve, a gas cylinder A and a gas cylinder B; characterized in that: Valve a, pressure regulator, input gas pressure gauge, valve b, gas path pressure gauge, valve c are sequentially arranged on pipeline A between filter C and gas cylinder A, pipeline A between valve b and valve c is communicated with pipeline B, the lower end of pipeline B is communicated with pipeline C, and the upper end is connected with the measuring point A of the pneumatic servo mechanism; one end of pipeline C is communicated with pipeline A and located between the input gas pressure gauge and valve b, and the lower end of pipeline B is connected between the one-way valve C and valve f; valve e and electromagnetic valve are sequentially arranged on pipeline B, pipeline D is communicated between the communication position of pipeline A and pipeline B and valve e, pipeline D is connected with the measuring point B of the pneumatic servo mechanism, and valve d is arranged on pipeline D; valve i, pressure relief valve, air tightness test pressure gauge A, cut-off nozzle A, air tightness test pressure gauge B, one-way valve C and valve f are sequentially arranged on pipeline C; the measuring point C of the pneumatic servo mechanism is connected with gas cylinder B through pipeline E, valve g, valve h, pressure protector and leak detection pressure gauge are sequentially arranged on pipeline E; the measuring point C of the pneumatic servo mechanism is communicated with the on-off valve A in the gas path control system, the measuring point A is communicated with the nitrogen inlet at the left end of the gas path control system, and the measuring point B is connected with the input refrigeration port of the gas path control system.

2. The system for testing a gas path control system of claim 1, wherein: A pressure sensor is arranged on the pneumatic servo mechanism.

3. The system for testing a gas path control system of claim 1, wherein: A cut-off nozzle B is arranged on valve g.

4. A test method for testing a gas circuit control system, using the system for testing a gas circuit control system according to any one of claims 1 to 3, characterized in that: The measuring point C of the pneumatic servo mechanism is communicated with the on-off valve A in the gas path control system, the measuring point A is communicated with the nitrogen inlet at the left end of the gas path control system, and the measuring point B is connected with the input refrigeration port of the gas path control system, and a stop valve is arranged on the output refrigeration port in the stop state, the on-off valve A is in the open state during testing, and the specific steps include the following steps: S1, refrigeration control valve air tightness test Valve a, valve b and valve d are opened, valve i, valve f, valve h, valve e and valve c are closed, valve g is adjusted from the middle position to the lower position to be in the open state, and is communicated with the pressure protector, leak detection pressure gauge and gas cylinder B, at this time, pressure is sequentially passed through filter C, valve a, valve b, valve d to measuring point B, input to the refrigeration control valve in the gas path control system, the refrigeration control valve is in the closed state, if there is leakage, the gas passes through one-way valve A and on-off valve A and enters measuring point C; output to valve g and leak detection pressure gauge, adjust the pressure of the pressure regulator to P1 MPa, keep pressure for t minutes, the pressure of the leak detection pressure gauge does not decrease by not more than ΔP1 MPa, at this time, it indicates that the refrigeration control valve is qualified under the pressure P1; S2, performance test of pressure reducing valve Open valve a, valve b, valve h, close valve i, valve f, valve d, valve g is in the middle position of the closed state, adjust the pressure of the pressure regulator to P2 MPa, slowly open valve c, open valve e and solenoid valve, the gas enters the measuring point A in turn through the filter C, valve a, valve b, valve e, solenoid valve, the gas entering the measuring point A passes through the nitrogen inlet at the left end of the gas path control system, the first filter, the pressure reducing valve, the check valve B, the on-off valve A in turn, and is output by the measuring point C of the pneumatic servo mechanism, the output pressure of the pressure reducing valve in the gas path control system is tested by the pressure sensor, and the output pressure change is not greater than ΔP2 MPa, which is qualified; S3, on-off valve performance test On-off valve B, on-off valve C, on-off valve D, on-off valve E work normally, open valve a, valve b, valve h, close valve i, valve f, valve d, adjust the pressure of the pressure regulator to P4 MPa, open valve c, valve e, the gas enters the measuring point A in turn through the filter C, valve a, valve b, valve e, solenoid valve, the gas entering the measuring point A passes through the first filter, the pressure reducing valve, the check valve B, the on-off valve A in turn, and is output from the measuring point C; the gas entering the measuring point A also passes through the first filter, the pressure reducing valve, the timing valve into on-off valve B, on-off valve C, on-off valve D, on-off valve E; valve g is in the upper position of the open state, the gas communicates with the intercepting nozzle B, the intercepting nozzle B simulates the pressure load, at this time, the electromagnetic coils of on-off valve B, on-off valve C, on-off valve D, on-off valve E in the gas path control system are inputted with step signals respectively, the opening and closing of on-off valve B, on-off valve C, on-off valve D, on-off valve E are controlled, P4 MPa pressure is output through the gas output end of on-off valve B, on-off valve C, on-off valve D, on-off valve E, and the gas enters the piston cavity of cylinder A, cylinder B, cylinder C, cylinder D respectively, the piston drives the rotating shaft of the crank connecting rod structure and the elastic load on the rotating shaft to rotate, at this time, the current change time of on-off valve B, on-off valve C, on-off valve D, on-off valve E coil is collected and measured, whether the response time of on-off valve B, on-off valve C, on-off valve D, on-off valve E is qualified is judged; S4, gas path control system performance test Open valve a, valve b, valve h, close valve i, valve f, valve d, adjust the pressure of the pressure regulator to P3 MPa, open valve c, valve e, gas through filter C, valve a, valve b, valve e, electromagnetic valve in turn after entering the measuring point A, valve g in the upper position of the open state, with the intercept nozzle B, into the measuring point A of the gas in turn through the left end of the nitrogen inlet, the first filter, pressure reducing valve, check valve B, switch valve A, gas from the pneumatic servo mechanism measuring point C output, to the intercept nozzle B analog pressure load; Into the measuring point A of the gas also by the first filter, pressure reducing valve, check valve B, timing valve into switch valve B, switch valve C, switch valve D, switch valve E, at this time the switch valve B, switch valve C, switch valve D, switch valve E in the pneumatic control system of electromagnetic coil respectively input PWM signal, high frequency control switch valve B, switch valve C, switch valve D, switch valve E open and close, P3 MPa pressure through switch valve B, switch valve C, switch valve D, switch valve E output end gas respectively into the piston cavity of cylinder A, cylinder B, cylinder C, cylinder D, piston driven crank connecting rod structure of the shaft and the elastic load on the shaft to rotate in one direction or two directions; The shaft is connected with the analog load and the coaxial feedback potentiometer, the instantaneous time change and the corresponding instantaneous angular position change of the shaft are detected through the feedback potentiometer voltage change signal, and the working performance of the pneumatic control system is tested according to whether the time change and the corresponding instantaneous angular position change are qualified; S5, test the overall air tightness of the pneumatic control system Close valve b, valve c, valve f, valve d, valve h, open valve a, valve e, valve i, valve g to the middle position of the closed state, gas through filter C, valve a, pressure regulator, valve i, air tightness test pressure gauge A, intercept nozzle A, air tightness test pressure gauge B, check valve C, valve e, electromagnetic valve in turn after entering the measuring point A, that is, into the first filter, pressure reducing valve, check valve B, check valve A, timing valve, switch valve A, switch valve B, switch valve C, switch valve D, switch valve E in the pneumatic control system left end, adjust the pressure of the pressure regulator to P5 MPa, at this time the whole pneumatic control system is in the same state as measuring point A and isolated from the atmosphere; If any of the pressure reducing valve, check valve B, check valve A, timing valve, switch valve A, switch valve B, switch valve C, switch valve D, switch valve E in the pneumatic control system, the check valve close to the test inlet and the intercept valve at the output refrigeration appear leakage, the pressure values of air tightness test pressure gauge B and air tightness test pressure gauge A are inconsistent; After stable work, the difference between air tightness test pressure gauge B and air tightness test pressure gauge A is not more than ΔP5 MPa, indicating that the overall air tightness test of the pneumatic servo mechanism is qualified; During the test, the sealing test of switch valve B, switch valve C, switch valve D and switch valve E respectively when opening and closing is also needed.

5. The method of testing a gas path control system of claim 4, wherein: In step S3, the criteria for judging whether the response times of the on-off valves B, C, D and E are qualified or not is: whether the time Δt1 for the current to change from 0 to I1 when the coil of the on-off valves B, C, D and E is powered to attract the valve core, and the time Δt2 for the current to change from I1 to 0 when the coil is powered off to release the valve core, are ≤t1 and ≤t2 respectively under the simulated load; yes for qualified, no for unqualified, wherein, Δt1 and Δt2 are the actual response times, t1 and t2 are the set allowable response times. 1、 Δt2 is the actual response time, t 1、 t2 is the set allowable response time.

6. The test method of testing a gas path control system of claim 4, wherein: In the working performance test of the gas circuit control system in step S4, the performance test method of the timing valve is as follows: the electromagnetic valve starting is the timing zero point, and the opening time is recorded as t3; under the condition that the switch valve B is pre-powered, the response time of the gas passing through the first filter, the pressure reducing valve, the one-way valve B, the timing valve, the switch valve B, the piston, the rotating shaft and the feedback potentiometer is recorded as t4, and whether the difference Δty between t4 and t3 meets the requirement of the pre-set value is used to judge the performance of the timing valve, which is qualified or unqualified.

7. The method of testing a gas circuit control system of claim 4, wherein: In the overall gas tightness test of the gas circuit control system in step S5, a pressure relief valve is connected to the pipeline C between the valve i and the gas tightness test pressure gauge A, so as to ensure that the pressure of the pipeline C is within the set range.

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