A safety valve performance test testing device and testing method

Abstract

The application discloses a safety valve performance test testing device and testing method, and a technical scheme is as follows: a workbench is provided with a testing transfer mechanism on the top and normal-temperature performance test mechanisms and low-temperature performance test mechanisms on the bottom; the testing transfer mechanism comprises two top plates fixed on the top of the workbench, a first lead screw and a second lead screw arranged between the two top plates, the two ends of the first lead screw are fixedly connected with the two top plates, the two ends of the first lead screw and the second lead screw are connected with the two top plates through bearings, one side of one of the top plates is fixedly provided with two motors, the output ends of the two motors are fixedly connected with the first lead screw and the second lead screw, a supporting plate is arranged on the top of the workbench, and two sliding blocks are fixedly arranged on the bottom of the supporting plate; the application has the advantages that various tests can be conveniently performed, the test efficiency is high, the safety valve can be conveniently transferred, the performance cost of normal temperature and low temperature is lower, and the application is convenient, fast, and high in precision.

Description

Technical Field

[0001] This invention relates to the field of safety valve performance testing technology, specifically to a safety valve performance testing device and testing method. Background Technology

[0002] A safety valve is a special valve that is normally closed under external force. When the pressure of the medium in the equipment or pipeline rises above a specified value, it discharges the medium to the outside of the system to prevent the pressure of the medium in the pipeline or equipment from exceeding the specified value. Safety valves belong to the category of automatic valves and are mainly used on boilers, pressure vessels, and pipelines to control the pressure to not exceed the specified value. They play an important role in protecting personal safety and equipment operation. Note that safety valves must undergo a pressure test before they can be used.

[0003] Existing pilot-operated safety valves are a type of valve used as overpressure protection devices on pressure vessels and pressure pipelines. The performance of safety valves directly affects the safe operation of pressure-bearing equipment and pipelines. Safety valve performance testing cannot accurately measure and verify the performance data of safety valves at room temperature and low temperature, which leads to increased testing costs. At the same time, safety valve performance testing can only test one type of performance, resulting in low testing efficiency. When conducting a second performance test, disassembly, installation, and transportation are relatively troublesome and inconvenient. Summary of the Invention

[0004] To address this issue, the present invention provides a safety valve performance testing device and method to solve the problems of safety valve performance testing, which cannot accurately measure and verify the performance data of safety valves at room temperature and low temperature, leading to increased testing costs. In addition, safety valve performance testing can only test one type of performance, resulting in low testing efficiency. Furthermore, when conducting a second performance test, disassembly, installation, and transportation are cumbersome and inconvenient.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a safety valve performance testing device and testing method, comprising a workbench, a test transfer mechanism on the top of the workbench, and a room temperature performance testing mechanism and a low temperature performance testing mechanism on the bottom of the workbench;

[0006] The test transfer mechanism includes two top plates, which are fixedly mounted on the top of the workbench. A first lead screw and a second lead screw are respectively provided between the two top plates. The two ends of the first lead screw are fixedly connected to the two top plates, and the two ends of the first and second lead screws are respectively connected to the two top plates via bearings. Two motors are fixedly mounted on one side of one of the top plates, and the output ends of the two motors are respectively fixedly connected to the first and second lead screws. A support plate is provided on the top of the workbench, and two sliders are fixedly mounted on the bottom of the support plate. The first and second lead screws pass through the two sliders and are threadedly connected to the sliders. An opening is provided on one side of the support plate. There are two sliding grooves, each with a sliding toothed plate inside. The sliding toothed plates are slidably connected to the grooves. Each of the two sliding toothed plates has a second gear on one side, and the two sliding toothed plates mesh with the two second gears respectively. Each of the two support plates has a connecting rod connected to one side via a bearing. The two connecting rods are fixedly connected to the two second gears respectively. Both connecting rods penetrate the side wall of the support plate. Each of the two connecting rods has a first gear fixedly connected to its other end. Two toothed plates are fixedly connected between the two top plates, and the two toothed plates mesh with the two first gears respectively. Each of the two sliding toothed plates has a fixing component on its top.

[0007] Preferably, the ambient temperature performance testing mechanism includes a second connecting pipe, which passes through the workbench and is fixedly connected to it. A second pressure sensor is fixedly installed on one side of the second connecting pipe. A pressure relief valve is fixedly connected to the bottom of the second connecting pipe. A ball valve is connected to one side of the pressure relief valve. A second test container is fixedly connected to one side of the ball valve. A through pipe is fixedly installed on one side of the second test container. A flow meter and a regulating valve are fixedly installed on one side of the through pipe. An air storage tank is fixedly connected to one end of the through pipe. A second air compressor is connected to one side of the air storage tank.

[0008] Preferably, the low-temperature performance testing mechanism includes a first connecting pipe, which passes through the workbench and is fixedly connected to it. An insulation cover is fixedly installed on the top of the workbench. The first connecting pipe passes through the insulation cover and is fixedly connected to it. A ring tube is fixedly installed inside the insulation cover. Multiple nozzles are fixedly installed on the inner side of the ring tube. A liquid nitrogen bottle is fixedly installed on the top of the workbench. The output end of the liquid nitrogen bottle passes through the insulation cover and is fixedly connected to the ring tube. A drain pipe is fixedly installed on one side of the insulation cover, passing through one of the nozzles. A first low-temperature shut-off valve is fixedly connected to the bottom of the first connecting pipe. A first temperature sensor is fixedly installed on one side of the first connecting pipe. A butterfly valve is fixedly connected to the bottom of the first low-temperature shut-off valve. A second low-temperature shut-off valve is fixedly connected to the bottom of the butterfly valve. A first test container is fixedly installed at the bottom of the second low-temperature shut-off valve. A first pressure sensor is fixedly installed on the top of the first test container. A first air compressor is fixedly installed on one side of the first test container.

[0009] Preferably, the fixing component includes a fixing block, which is fixedly disposed on the top of the sliding toothed plate. Two telescopic rods are fixedly connected to one side of the fixing block, and a clamping plate is fixedly connected to the other end of the two telescopic rods. A pad is fixedly embedded on one side of the clamping plate, and a threaded rod is provided on one side of the clamping plate. The clamping plate and the threaded rod are connected by a bearing. The threaded rod passes through the fixing block and is threadedly connected to the fixing block. A knob is fixedly connected to one end of the threaded rod.

[0010] Preferably, a support platform is fixedly provided on the top of the support plate, and a safety valve body is provided on the top of the support platform. The safety valve body is in contact with the pad block, and a displacement sensor is provided on the top of the safety valve body.

[0011] Preferably, the workbench is fixedly connected to four support legs at its bottom corners.

[0012] Preferably, a second support base is fixedly provided at the bottom of the second test container.

[0013] Preferably, a first support base is fixedly provided at the bottom of the first test container, and a first base plate is fixedly provided on one side of the first support base, and the first base plate is fixedly provided at the bottom of the first air compressor.

[0014] Preferably, a third support base is fixedly provided at the bottom of the air storage tank, and a second base plate is fixedly provided on one side of the third support base. The second base plate is fixedly provided at the bottom of the second air compressor.

[0015] A test method for a safety valve performance testing device, the specific steps of which are as follows:

[0016] S1. Safety Valve Transfer: Place the safety valve on the support platform, turn the knob, the knob turns and drives the threaded rod to turn, the threaded rod moves and pushes the clamping plate to move, so that the two clamping plates fix the safety valve body. The pad is made of rubber to reduce friction. Start the motor, the motor drives the second lead screw to turn, the second lead screw turns and drives the slider to move, the slider drives the support plate to move. Since the first gear meshes with the toothed plate, the support plate moves and drives the first gear to move. During the movement of the support plate, the first gear is affected by the toothed plate to rotate. The first gear rotates and drives the connecting rod to rotate. The connecting rod rotates and drives the second gear to rotate. The second gear rotates and drives the sliding toothed plate to move. Since the fixed block is fixed on the top of the sliding toothed plate, when the support plate moves to one side, the sliding toothed plate and the fixed block on its top will be displaced on the support plate. The displacement direction is the same as the movement direction of the support plate, so that the sliding toothed plate drives the fixed block to move. The fixed block drives the telescopic rod to move, so that the clamping plate moves and drives the safety valve body to move. So that the safety valve body moves to the opening position of the support plate and connects with the first connecting pipe or the second connecting pipe.

[0017] S2. Low-Temperature Performance Test: The bottom of the safety valve body is connected to the first connecting pipe, and the safety valve body is fixed to the first connecting pipe with bolts. The liquid nitrogen cylinder is activated, and liquid nitrogen is pushed into the ring pipe through the cylinder and sprayed out through the nozzle onto the outside of the first connecting pipe. At the same time, the liquid nitrogen is stored inside the insulation shell. The liquid nitrogen cools the first connecting pipe and the gas inside it, controlling the temperature at the inlet of the safety valve body. The insulation shell protects the temperature from rising too quickly, effectively reducing the external temperature of the shell at the inlet of the safety valve body. The rate of temperature reduction can be controlled by controlling the spray volume. When the pressure reaches or exceeds the set pressure of the safety valve body, the first air compressor delivers... The medium is used to open the safety valve body. After the safety valve body is fully cooled by several opening and closing cycles, a low-temperature opening pressure test is conducted on the safety valve body. The pressure at which the safety valve body just opens under the action of the low-temperature medium is the opening pressure. After the safety valve body opens, the first low-temperature shut-off valve on the first test container is opened. When the pressure is released to 70% of the set pressure of the safety valve body, the first low-temperature shut-off valve is closed, allowing the low-temperature medium to naturally vaporize and the pressure to rise. The pressure in the first test container is maintained at 90% of the set pressure through the second low-temperature shut-off valve. The low-temperature sealing condition of the safety valve body can be obtained by observing the leakage at the outlet of the safety valve body. The first pressure sensor detects the pressure, and the first temperature sensor detects the temperature.

[0018] S3. Room Temperature Performance Test: Connect and fix the safety valve body through the second connecting pipe. Inject clean air with sufficient pressure into the air tank through the second air compressor. At the same time, the initial pressure in the second test container should be lower than 90% of the opening pressure of the safety valve body under test. Detect the valve disc height inside the safety valve body through the displacement sensor. Open the regulating valve to slowly increase the pressure in the second test container. When the safety valve body just shows displacement or continuous leakage, it is considered that the valve has opened. The pressure at this time is the opening pressure. Continue to inject pressure into the second test container. The pressure when the safety valve body is fully opened and discharged is the discharge pressure. The displacement of the valve disc at this time is the opening height. Close the regulating valve until the safety valve body under test returns to the sealed position due to the decrease in pressure in the second test container. The pressure at this time is the reseating pressure of the safety valve. Collect the opening pressure, discharge pressure, opening height, and reseating pressure. Detect the pressure through the second pressure sensor and the flow rate through the flow meter.

[0019] The embodiments of the present invention have the following advantages:

[0020] During the movement of the support plate, the first gear rotates under the influence of the toothed plate. The rotation of the first gear drives the connecting rod to rotate, the rotation of the connecting rod drives the second gear to rotate, the rotation of the second gear drives the sliding toothed plate to move, the sliding toothed plate drives the fixed block to move, the fixed block drives the telescopic rod to move, the clamping plate moves and drives the safety valve body to move, so that the safety valve body moves to the opening position of the support plate and docks with the first or second connecting pipe, which facilitates various performance tests, has high testing efficiency, and also facilitates the transfer of the safety valve.

[0021] Liquid nitrogen is pushed into the ring tube through a liquid nitrogen bottle and sprayed out through a nozzle onto the outside of the first connecting tube. At the same time, the liquid nitrogen is stored inside the insulation cover. The liquid nitrogen cools the first connecting tube and the gas inside it. The rate of temperature reduction can be controlled by controlling the amount of spray. This allows for both good pressure increase and effective maintenance of the temperature at the inlet of the tested safety valve, thus enabling better testing of low-temperature performance, more accurate data, and lower testing costs. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 A cross-sectional view of the overall structure provided for this invention;

[0026] Figure 3 Top view of the overall structure provided by the present invention;

[0027] Figure 4 This is a side sectional view provided by the present invention;

[0028] Figure 5 A perspective view of the test transport mechanism provided by the present invention;

[0029] Figure 6A cross-sectional view of the test transfer mechanism provided by the present invention;

[0030] Figure 7 Provided by the present invention Figure 2 Enlarged view of the structure of section A in the middle;

[0031] Figure 8 Provided by the present invention Figure 4 Enlarged view of the structure of section B in the middle.

[0032] In the diagram: 1. Workbench; 2. Top plate; 3. Toothed plate; 4. First lead screw; 5. Motor; 6. Second lead screw; 7. First connecting pipe; 8. Safety valve body; 9. Insulation cover; 10. Second connecting pipe; 11. Support leg; 12. Support plate; 13. Liquid nitrogen cylinder; 14. Drain pipe; 15. First test container; 16. First air compressor; 17. Support platform; 18. First base plate; 19. First support base; 20. Second test container; 21. Second support base; 22. Ring pipe; 23. Slider; 24. Pad; 25. Clamping plate; 26. Threaded rod; 27. 28. Telescopic rod; 29. ​​Knob; 30. Fixing block; 31. Slide groove; 32. Sliding toothed plate; 33. Connecting rod; 34. First gear; 35. Second gear; 36. Third support base; 37. Second base plate; 38. Second air compressor; 39. Air tank; 40. Regulating valve; 41. Through pipe; 42. First temperature sensor; 43. Butterfly valve; 44. Second low temperature shut-off valve; 45. First pressure sensor; 46. Ball valve; 47. Pressure relief valve; 48. Second pressure sensor; 49. Flow meter; 50. Displacement sensor; 51. Nozzle. Implementation

[0033] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] See attached document Figure 1-8 The present invention provides a safety valve performance testing device and testing method, including a workbench 1, a test transfer mechanism on the top of the workbench 1, and a normal temperature performance testing mechanism and a low temperature performance testing mechanism on the bottom of the workbench 1.

[0035] The test transfer mechanism includes two top plates 2, which are fixedly mounted on the top of the workbench 1. A first lead screw 4 and a second lead screw 6 are respectively provided between the two top plates 2. The two ends of the first lead screw 4 are fixedly connected to the two top plates 2, and the two ends of the first lead screw 4 and the second lead screw 6 are respectively connected to the two top plates 2 via bearings. Two motors 5 are fixedly mounted on one side of one of the top plates 2, and the output ends of the two motors 5 are respectively fixedly connected to the first lead screw 4 and the second lead screw 6. A support plate 12 is provided on the top of the workbench 1, and two sliders 23 are fixedly mounted on the bottom of the support plate 12. The first lead screw 4 and the second lead screw 6 pass through the two sliders 23 and are threadedly connected to the sliders 23. Two grooves are provided on one side of the support plate 12. 30. Each of the two sliding grooves 30 is provided with a sliding toothed plate 31, which is slidably connected to the sliding groove 30. Each of the two sliding toothed plates 31 is provided with a second gear 34 on one side, and the two sliding toothed plates 31 mesh with the two second gears 34 respectively. Each of the two support plates 12 is connected to a connecting rod 32 by a bearing on one side, and the two connecting rods 32 are fixedly connected to the two second gears 34 respectively. Each of the two connecting rods 32 passes through the side wall of the support plate 12. Each of the two connecting rods 32 is fixedly connected to a first gear 33 at the other end. Two toothed plates 3 are fixedly connected between the two top plates 2, and the two toothed plates 3 mesh with the two first gears 33 respectively. Each of the two sliding toothed plates 31 is provided with a fixing component on its top.

[0036] In this embodiment, the motor 5 is started, which drives the lead screw 6 to rotate. The lead screw 6 rotates and drives the slider 23 to move. The slider 23 drives the support plate 12 to move. Since the first gear 33 meshes with the toothed plate 3, the support plate 12 moves and drives the first gear 33 to move. During the movement of the support plate 12, the first gear 33 rotates due to the influence of the toothed plate 3. The first gear 33 rotates and drives the connecting rod 32 to rotate. The connecting rod 32 rotates and drives the second gear 34 to rotate. The second gear 34 rotates and drives the sliding toothed plate 31 to move. Since the fixed block 29 is fixed on the top of the sliding toothed plate 31, when the support plate 12 moves to one side, the sliding toothed plate 31 and the fixed block 29 on its top will be displaced on the support plate 12. The displacement direction is the same as the movement direction of the support plate 12. The sliding toothed plate 31 drives the fixed block 29 to move. The fixed block 29 drives the telescopic rod 27 to move. The clamping plate 25 moves and drives the safety valve body 8 to move. The safety valve body 8 moves to the opening position of the support plate 12 and docks with the first connecting pipe 7 or the second connecting pipe 10.

[0037] To achieve the purpose of low-temperature performance testing, this device adopts the following technical solution: The low-temperature performance testing mechanism includes a first connecting pipe 7, which penetrates the workbench 1 and is fixedly connected to it. A thermal insulation cover 9 is fixedly installed on the top of the workbench 1. The first connecting pipe 7 penetrates the thermal insulation cover 9 and is fixedly connected to it. A ring pipe 22 is fixedly installed inside the thermal insulation cover 9. Multiple nozzles 51 are fixedly installed on the inner side of the ring pipe 22. A liquid nitrogen bottle 13 is fixedly installed on the top of the workbench 1. The output end of the liquid nitrogen bottle 13 penetrates the thermal insulation cover 9 and is fixedly connected to the ring pipe 22. A drain pipe 14 is fixedly installed on one side of the thermal insulation cover 9, penetrating one of the nozzles 22. A first low-temperature shut-off valve 42 is fixedly connected to the bottom of the first connecting pipe 7. A first temperature sensor 41 is fixedly installed on one side of the first connecting pipe 7. The bottom of the first low-temperature shut-off valve 42 is fixedly connected to... A butterfly valve 43 is connected, and a second cryogenic shut-off valve 44 is fixedly connected to the bottom of the butterfly valve 43. A first test container 15 is fixedly mounted on the bottom of the second cryogenic shut-off valve 44, and a first pressure sensor 45 is fixedly mounted on the top of the first test container 15. A first air compressor 16 is fixedly mounted on one side of the first test container 15. The medium is supplied through the first air compressor 16. The safety valve 8 is opened. After the safety valve 8 is fully cooled by several opening and closing cycles, a cryogenic opening pressure test is conducted on the safety valve 8. The pressure at which the safety valve 8 is just opened under the action of the cryogenic medium is the opening pressure. After the safety valve 8 opens, the first cryogenic shut-off valve 42 on the first test container 15 is opened, and the pressure is released to 70% of the set pressure of the safety valve 8. When the first low-temperature shut-off valve 42 is closed, the low-temperature medium is allowed to naturally vaporize and the pressure rises. The pressure inside the first test container 15 is maintained at 90% of the set pressure through the second low-temperature shut-off valve 44. The low-temperature sealing condition of the safety valve body 8 can be obtained by observing the leakage at the outlet of the safety valve body 8. The first pressure sensor 45 detects the pressure and the first temperature sensor 41 detects the temperature.

[0038] To achieve the purpose of room temperature performance testing, this device adopts the following technical solution: The room temperature performance testing mechanism includes a second connecting pipe 10, which passes through the workbench 1 and is fixedly connected to the workbench 1. A second pressure sensor 48 is fixedly installed on one side of the second connecting pipe 10. A pressure relief valve 47 is fixedly connected to the bottom of the second connecting pipe 10. A ball valve 46 is connected to one side of the pressure relief valve 47. A second test container 20 is fixedly connected to one side of the ball valve 46. A through pipe 40 is fixedly installed on one side of the second test container 20. A flow meter 49 and a regulating valve 39 are fixedly installed on one side of the through pipe 40. A gas storage tank 38 is fixedly connected to one end of the through pipe 40. A second air compressor 37 is connected. The regulating valve 39 is opened to slowly increase the pressure in the second test container 20. When the safety valve body 8 just shows displacement or continuous leakage, it is considered that the valve has been opened. The pressure at this time is the opening pressure. Continue to inject pressure into the second test container 20. The pressure when the safety valve body 8 is fully opened and discharged is the discharge pressure. The displacement of the valve disc at this time is the opening height. Close the regulating valve 39 until the tested safety valve body 8 returns to the sealed position due to the decrease in pressure in the second test container 20. The pressure value at this time is the reseating pressure of the safety valve. The opening pressure, discharge pressure, opening height and reseating pressure are collected. The pressure is detected by the second pressure sensor 48 and the flow rate is detected by the flow meter 49.

[0039] To achieve the purpose of fixation, this device adopts the following technical solution: The fixing component includes a fixing block 29, which is fixedly disposed on the top of the sliding toothed plate 31. Two telescopic rods 27 are fixedly connected to one side of the fixing block 29, and a clamping plate 25 is fixedly connected to the other end of the two telescopic rods 27. A pad 24 is fixedly embedded on one side of the clamping plate 25, and a threaded rod 26 is provided on one side of the clamping plate 25. The clamping plate 25 and the threaded rod 26 are connected by a bearing. The threaded rod 26 passes through the fixing block 29 and is fixed to the top of the sliding toothed plate 31. The fixed block 29 is threadedly connected, and a knob 28 is fixedly connected to one end of the threaded rod 26. A support platform 17 is fixedly provided on the top of the support plate 12. A safety valve body 8 is provided on the top of the support platform 17. The safety valve body 8 is in contact with the pad block 24. A displacement sensor 50 is provided on the top of the safety valve body 8. Rotating the knob 28 will cause the threaded rod 26 to rotate, which will move the threaded rod 26 and push the clamping plate 25 to move, so that the two clamping plates 25 fix the safety valve body 8. The pad block 24 is made of rubber to reduce friction.

[0040] To achieve the supporting purpose, the device adopts the following technical solution: support legs 11 are fixedly connected to the four corners of the bottom of the workbench 1; a second support base 21 is fixedly provided at the bottom of the second test container 20; a first support base 19 is fixedly provided at the bottom of the first test container 15; a first base plate 18 is fixedly provided on one side of the first support base 19; the first base plate 18 is fixedly provided at the bottom of the first air compressor 16; a third support base 35 is fixedly provided at the bottom of the air tank 38; a second base plate 36 is fixedly provided on one side of the third support base 35; the second base plate 36 is fixedly provided at the bottom of the second air compressor 37. The support legs 11 provide support; the second support base 21 provides support for the second test container 20; the first base plate 18 provides support for the first air compressor 16; the first support base 19 provides support for the first test container 15; the third support base 35 provides support for the air tank 38; and the second base plate 36 provides support for the second air compressor 37.

[0041] A test method for a safety valve performance testing device, the specific steps of which are as follows:

[0042] S1. Safety Valve Transfer: Place the safety valve on the support platform 17, turn the knob 28. The knob 28 rotates and drives the threaded rod 26 to rotate, causing the threaded rod 26 to move and push the clamping plate 25 to move, so that the two clamping plates 25 fix the safety valve body 8. The pad 24 is made of rubber to reduce friction. Start the motor 5. The motor 5 drives the second lead screw 6 to rotate. The second lead screw 6 rotates and drives the slider 23 to move. The slider 23 drives the support plate 12 to move. Since the first gear 33 meshes with the toothed plate 3, the movement of the support plate 12 will drive the first gear 33 to move. During the movement of the support plate 12, the first gear 33 rotates under the influence of the toothed plate 3. The rotating mechanism drives the connecting rod 32 to rotate, which in turn drives the second gear 34 to rotate. The second gear 34 then drives the sliding toothed plate 31 to move. Since the fixed block 29 is fixedly mounted on the top of the sliding toothed plate 31, when the support plate 12 moves to one side, the sliding toothed plate 31 and the fixed block 29 on its top will be displaced on the support plate 12. The displacement direction is consistent with the moving direction of the support plate 12, causing the sliding toothed plate 31 to drive the fixed block 29 to move. The fixed block 29 then drives the telescopic rod 27 to move, causing the clamping plate 25 to move and drive the safety valve body 8 to move. The safety valve body 8 moves to the opening position of the support plate 12 and connects with the first connecting pipe 7 or the second connecting pipe 10.

[0043] S2. Low-Temperature Performance Test: The bottom of the safety valve body 8 is connected to the first connecting pipe 7, and the safety valve body 8 is fixed to the first connecting pipe 7 with bolts. The liquid nitrogen cylinder 13 is activated, and liquid nitrogen is pushed into the ring pipe 22 through the liquid nitrogen cylinder 13. It is then sprayed out through the nozzle 51 and sprayed onto the outside of the first connecting pipe 7. At the same time, the liquid nitrogen is stored inside the insulation cover 9. The liquid nitrogen cools the first connecting pipe 7 and the gas inside it, thereby controlling the temperature at the inlet of the safety valve body 8. The insulation cover 9 protects the temperature so that it does not rise rapidly, effectively reducing the temperature at the inlet of the safety valve body 8. The temperature outside the shell can be controlled by controlling the amount of spray. When the pressure reaches and exceeds the set pressure of the safety valve body 8, the medium is delivered through the first air compressor 16, and the safety valve body 8 opens. After the safety valve body 8 is fully cooled by several opening and closing cycles, a low-temperature opening pressure test is conducted on the safety valve body 8. The pressure at which the safety valve body 8 just opens under the action of the low-temperature medium is the opening pressure. After the safety valve body 8 opens, the first low-temperature shut-off valve 42 on the first test container 15 is opened. When the pressure is released to 70% of the set pressure of the safety valve body 8, the first low-temperature shut-off valve 42 is closed, allowing the low-temperature medium to naturally vaporize and the pressure to rise. Through the second low-temperature shut-off valve 44, the pressure in the first test container 15 is maintained at 90% of the set pressure. The low-temperature sealing condition of the safety valve body 8 can be obtained by observing the leakage at the outlet of the safety valve body 8. The first pressure sensor 45 detects the pressure, and the first temperature sensor 41 detects the temperature.

[0044] S3. Room Temperature Performance Test: Connect and fix the safety valve body 8 to the second connecting pipe 10. Inject clean air with sufficient pressure into the air tank 38 through the second air compressor 37. At the same time, the initial pressure in the second test container 20 should be lower than 90% of the opening pressure of the safety valve body 8 under test. Detect the valve disc height inside the safety valve body 8 through the displacement sensor 50. Open the regulating valve 39 to slowly increase the pressure in the second test container 20. When the safety valve body 8 just shows displacement or continuous leakage, it is considered that the valve has opened. The pressure at this time is the opening pressure. Continue to inject pressure into the second test container 20. The pressure when the safety valve body 8 is fully opened and discharged is the discharge pressure. The displacement of the valve disc at this time is the opening height. Close the regulating valve 39 until the safety valve body 8 under test returns to the sealed position due to the decrease in pressure in the second test container 20. The pressure at this time is the reseating pressure of the safety valve. Collect the opening pressure, discharge pressure, opening height, and reseating pressure. Detect the pressure through the second pressure sensor 48 and the flow rate through the flow meter 49.

[0045] The above description is merely a preferred embodiment of the present invention. Any person skilled in the art can modify the present invention or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent substitutions made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A safety valve performance testing device, comprising a workbench (1), characterized in that: The top of the workbench (1) is provided with a test transfer mechanism, and the bottom of the workbench (1) is provided with a normal temperature performance test mechanism and a low temperature performance test mechanism; The test transfer mechanism includes two top plates (2), which are fixedly mounted on the top of the workbench (1). A first lead screw (4) and a second lead screw (6) are respectively provided between the two top plates (2). The two ends of the first lead screw (4) and the second lead screw (6) are respectively connected to the two top plates (2) through bearings. Two motors (5) are fixedly mounted on one side of one of the top plates (2). The output ends of the two motors (5) are respectively fixedly connected to the first lead screw (4) and the second lead screw (6). Two support plates (12) are provided on the top of the workbench (1). Slider blocks (23) are fixedly mounted on the bottom of the two support plates (12). The first lead screw (4) and the second lead screw (6) pass through the sliders (23) and are threadedly connected to the sliders (23). Two grooves (30) are opened on one side of the support plate (12). Sliding toothed plates (31) are provided inside the sliding groove (30). The sliding toothed plates (31) are slidably connected to the sliding groove (30). A second gear (34) is provided on one side of each of the two sliding toothed plates (31). The two sliding toothed plates (31) mesh with the two second gears (34) respectively. A connecting rod (32) is connected to one side of each of the two support plates (12) through a bearing. The two connecting rods (32) are fixedly connected to the two second gears (34) respectively. The two connecting rods (32) penetrate the side wall of the support plate (12). A first gear (33) is fixedly connected to the other end of each of the two connecting rods (32). Two toothed plates (3) are fixedly connected between the two top plates (2). The two toothed plates (3) mesh with the two first gears (33) respectively. A fixing component is provided on the top of each of the two sliding toothed plates (31). The ambient temperature performance testing mechanism includes a second connecting pipe (10), which passes through the workbench (1) and is fixedly connected to the workbench (1). A second pressure sensor (48) is fixedly installed on one side of the second connecting pipe (10). A pressure relief valve (47) is fixedly connected to the bottom of the second connecting pipe (10). A ball valve (46) is connected to one side of the pressure relief valve (47). A second test container (20) is fixedly connected to one side of the ball valve (46). A through pipe (40) is fixedly installed on one side of the second test container (20). A flow meter (49) and a regulating valve (39) are fixedly installed on one side of the through pipe (40). An air storage tank (38) is fixedly connected to one end of the through pipe (40). A second air compressor (37) is connected to one side of the air storage tank (38). The low-temperature performance testing mechanism includes a first connecting pipe (7), which passes through the workbench (1) and is fixedly connected to the workbench (1). A heat insulation cover (9) is fixedly installed on the top of the workbench (1). The first connecting pipe (7) passes through the heat insulation cover (9) and is fixedly connected to the heat insulation cover (9). A ring pipe (22) is fixedly installed inside the heat insulation cover (9). Multiple nozzles (51) are fixedly installed on the inner side of the ring pipe (22). A liquid nitrogen bottle (13) is fixedly installed on the top of the workbench (1). The output end of the liquid nitrogen bottle (13) passes through the heat insulation cover (9) and is fixedly connected to the ring pipe (22). A drain pipe is fixedly installed on one side of the heat insulation cover (9). 14), the drain pipe (14) passes through one of the top plates (2), the bottom end of the first connecting pipe (7) is fixedly connected to a first low temperature shut-off valve (42), a first temperature sensor (41) is fixedly provided on one side of the first connecting pipe (7), a butterfly valve (43) is fixedly connected to the bottom of the first low temperature shut-off valve (42), a second low temperature shut-off valve (44) is fixedly connected to the bottom of the butterfly valve (43), a first test container (15) is fixedly provided at the bottom of the second low temperature shut-off valve (44), a first pressure sensor (45) is fixedly provided at the top of the first test container (15), and a first air compressor (16) is fixedly provided on one side of the first test container (15). The fixing component includes a fixing block (29), which is fixedly mounted on the top of the sliding toothed plate (31). Two telescopic rods (27) are fixedly connected to one side of the fixing block (29), and a clamping plate (25) is fixedly connected to the other end of the two telescopic rods (27). A pad (24) is fixedly embedded on one side of the clamping plate (25), and a threaded rod (26) is provided on one side of the clamping plate (25). The clamping plate (25) and the threaded rod (26) are connected by a bearing. The threaded rod (26) passes through the fixing block (29) and is threadedly connected to the fixing block (29). A knob (28) is fixedly connected to one end of the threaded rod (26).

2. The safety valve performance testing device according to claim 1, characterized in that: The support plate (12) is fixedly provided with a support platform (17) on the top. The support platform (17) is provided with a safety valve body (8) on the top. The safety valve body (8) is in contact with the pad (24). The safety valve body (8) is provided with a displacement sensor (50) on the top.

3. The safety valve performance testing device according to claim 1, characterized in that: The workbench (1) is fixedly connected to four support legs (11) at the bottom corners.

4. The safety valve performance testing device according to claim 1, characterized in that: The second test container (20) is fixedly provided with a second support base (21) at the bottom.

5. The safety valve performance testing device according to claim 1, characterized in that: The first test container (15) is fixedly provided with a first support base (19) at the bottom, and a first base plate (18) is fixedly provided on one side of the first support base (19). The first base plate (18) is fixedly provided at the bottom of the first air compressor (16).

6. The safety valve performance testing device according to claim 1, characterized in that: The bottom of the gas storage tank (38) is fixedly provided with a third support base (35), and a second base plate (36) is fixedly provided on one side of the third support base (35). The second base plate (36) is fixedly provided at the bottom of the second air compressor (37).

7. A test method for a safety valve performance testing device based on any one of claims 1-6, characterized in that: The specific steps are as follows: S1. Safety valve transfer: Place the safety valve on the support platform (17), turn the knob (28), the knob (28) rotates and drives the threaded rod (26) to rotate, so that the threaded rod (26) moves and pushes the clamping plate (25) to move, so that the two clamping plates (25) fix the safety valve body (8). The pad (24) is made of rubber to reduce friction. Start the motor (5), the motor (5) drives the second lead screw (6) to rotate, the second lead screw (6) rotates and drives the slider (23) to move, the slider (23) drives the support plate (12) to move. Since the first gear (33) meshes with the toothed plate (3), the support plate (12) moves and drives the first gear (33) to move. During the movement of the support plate (12), the first gear (33) rotates under the influence of the toothed plate (3). 3) Rotate and drive the connecting rod (32) to rotate. The connecting rod (32) rotates and drives the second gear (34) to rotate. The second gear (34) rotates and drives the sliding tooth plate (31) to move. Since the fixed block (29) is fixed on the top of the sliding tooth plate (31), when the support plate (12) moves to one side, the sliding tooth plate (31) and the fixed block (29) on its top will be displaced on the support plate (12). The displacement direction is consistent with the moving direction of the support plate (12), so that the sliding tooth plate (31) drives the fixed block (29) to move. The fixed block (29) drives the telescopic rod (27) to move, so that the card plate (25) moves and drives the safety valve body (8) to move. So that the safety valve body (8) moves to the opening position of the support plate (12) and docks with the first connecting pipe (7) or the second connecting pipe (10). S2. Low-temperature performance test: The bottom of the safety valve body (8) is connected to the first connecting pipe (7). The safety valve body (8) and the first connecting pipe (7) are fixed by bolts. The liquid nitrogen bottle (13) is started, and liquid nitrogen is pushed into the ring pipe (22) through the liquid nitrogen bottle (13). It is sprayed out through the nozzle (51) and sprayed on the outside of the first connecting pipe (7). At the same time, the liquid nitrogen is stored inside the heat insulation shell (9). The liquid nitrogen cools the first connecting pipe (7) and the gas inside it, and controls the temperature at the inlet of the safety valve body (8). The temperature will not rise quickly due to the protection of the heat insulation shell (9). It can effectively reduce the temperature outside the shell at the inlet of the safety valve body (8). The rate of temperature reduction can be controlled by controlling the amount of spray. When the pressure reaches and exceeds the set pressure of the safety valve body (8), the first air compressor (16) delivers the liquid nitrogen. The medium is delivered, the safety valve body (8) is opened, and after the safety valve body (8) is fully cooled by several opening and closing, a low temperature opening pressure test of the safety valve body (8) is conducted. The pressure when the safety valve body (8) is just opened under the action of the low temperature medium is the opening pressure. After the safety valve body (8) jumps, the first low temperature shut-off valve (42) on the first test container (15) is opened. When the pressure is released to 70% of the set pressure of the safety valve body (8), the first low temperature shut-off valve (42) is closed, and the low temperature medium is allowed to naturally vaporize and the pressure rises through the second low temperature shut-off valve (44) so ​​that the pressure in the first test container (15) is maintained at 90% of the set pressure. The low temperature sealing condition of the safety valve body (8) can be obtained by observing the leakage at the outlet of the safety valve body (8). The first pressure sensor (45) detects the pressure, and the first temperature sensor (41) detects the temperature. S3. Room temperature performance test: Connect and fix the second connecting pipe (10) to the safety valve body (8). Inject clean air with sufficient pressure into the air tank (38) through the second air compressor (37). At the same time, the initial pressure in the second test container (20) should be lower than 90% of the opening pressure of the safety valve body (8) under test. Detect the valve disc height inside the safety valve body (8) through the displacement sensor (50). Open the regulating valve (39) and slowly increase the pressure in the second test container (20). When the safety valve body (8) just shows displacement or continuous leakage, it is considered that the valve has stopped operating. Open the valve. The pressure at this time is the opening pressure. Continue to inject pressure into the second test container (20). The pressure when the safety valve body (8) is fully opened and discharged is the discharge pressure. The displacement of the valve disc at this time is the opening height. Close the regulating valve (39) until the safety valve body (8) under test returns to the sealed position due to the decrease in pressure in the second test container (20). The pressure value at this time is the reseating pressure of the safety valve. Collect the opening pressure, discharge pressure, opening height and reseating pressure. Detect the pressure through the second pressure sensor (48) and the flow meter (49) detect the flow.

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