Testing device and testing method for low-temperature area of safety valve

Abstract

The invention discloses a safety valve low-temperature area testing device and a testing method, relates to the technical field of valve detection, and particularly relates to performance testing of a low-temperature safety valve in liquid nitrogen and liquid helium temperature areas, such as take-off and sealing. The testing device comprises a low-temperature high-pressure tank, a low-temperature high-pressure tank input pipeline, a pressurizing pipeline, a cold jacket input pipeline, a low-temperature high-pressure tank output pipeline, a cold jacket output pipeline and a pre-cooling tank, the top of the low-temperature high-pressure tank is in sealed butt joint with a tested safety valve, and the periphery of the top of the low-temperature high-pressure tank is sleeved with a cold jacket; the pressurizing pipeline is provided with a first spiral section located in the pre-cooling tank and a second spiral section located in the low-temperature high-pressure tank. The testing device ensures that the inlet of the tested safety valve is in a testing medium temperature area through the cold jacket, and the pressurizing pipeline continuously provides cold energy while pressurizing the low-temperature high-pressure tank to prevent the temperature of the testing medium from rising, so that the temperature difference between the temperature of the inlet of the tested safety valve and the temperature of the testing medium is less than or equal to 30 DEG C; therefore, the working condition requirements of liquid helium low-temperature testing are met.

Description

Technical Field

[0001] The invention relates to the technical field of valve detection, and in particular to a low temperature zone testing device and a testing method for a safety valve. Background Art

[0002] Safety valve is an important safety device, which is mainly used to release pressure when the pressure exceeds a certain limit to protect the safety of equipment and personnel. With the continuous development of industrial technology, safety valve has become an indispensable safety device in various pressure vessel systems. In order to ensure the reliability and stability of the safety valve, it needs to be tested before use. The safety valve test bench is a device specially used for safety valve testing. However, conventional safety valve testing equipment cannot achieve performance testing under low temperature conditions, especially in the liquid helium temperature zone, and there is no mature and reliable testing equipment. Summary of the invention

[0003] The purpose of the present invention is to provide a safety valve low temperature zone test bench to solve the problem in the prior art that the safety valve cannot be effectively and reliably tested under low temperature conditions, especially in the liquid helium temperature zone.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A safety valve low temperature zone test device, comprising a low temperature and high pressure tank, a low temperature and high pressure tank input pipeline, a pressurizing pipeline, a cold jacket input pipeline, a low temperature and high pressure tank output pipeline and a cold jacket output pipeline, and a pre-cooling tank, wherein the top of the low temperature and high pressure tank is sealed and connected to the safety valve to be tested, and a cold jacket is provided on the outer periphery of the top of the low temperature and high pressure tank; the low temperature and high pressure tank is connected to a pre-cooling medium source or a test medium source through the low temperature and high pressure tank input pipeline, is connected to a pressurizing medium source through the pressurizing pipeline, and is connected to the outside world through the low temperature and high pressure tank output pipeline; the cold jacket is connected to the pre-cooling medium source or the test medium source through the cold jacket input pipeline, and is connected to the outside world through the cold jacket output pipeline; the pressurizing pipeline is provided with a first spiral section and a second spiral section that are connected to each other, the first spiral section is located inside the pre-cooling tank, and the second spiral section is located inside the low temperature and high pressure tank.

[0006] In an exemplary embodiment, the outlet of the cryogenic and high-pressure tank input pipeline extends to the bottom of the cryogenic and high-pressure tank, and the inlet of the cryogenic and high-pressure tank output pipeline is arranged at the top of the cryogenic and high-pressure tank.

[0007] In an exemplary embodiment, the pressurized pipeline extends to the bottom of the cryogenic and high-pressure tank through the second spiral section and then extends upward to the top of the cryogenic and high-pressure tank. The outlet of the pressurized pipeline is arranged at the top of the cryogenic and high-pressure tank.

[0008] In an exemplary embodiment, the low-temperature and high-pressure tank input pipeline and the cold jacket input pipeline converge into a main input pipeline at one end away from the low-temperature and high-pressure tank and the cold jacket.

[0009] In an exemplary embodiment, a first valve is provided on the total input pipeline, a second valve is provided on the low-temperature and high-pressure tank input pipeline, a third valve is provided on the pressurizing pipeline, a fourth valve is provided on the low-temperature and high-pressure tank output pipeline, and a fifth valve is provided on the cold jacket output pipeline.

[0010] In an exemplary embodiment, the system further includes a low-temperature and high-pressure tank backup output pipeline connected to the interior of the low-temperature and high-pressure tank, and a sixth valve is disposed on the low-temperature and high-pressure tank backup output pipeline.

[0011] In an exemplary embodiment, it further includes a pressure measuring pipeline provided with a pressure detection element, and the pressure measuring pipeline is connected to a position inside the low-temperature and high-pressure tank close to the safety valve to be tested.

[0012] In an exemplary embodiment, a first temperature detection element is disposed on the top of the cryogenic and high-pressure tank, and the first temperature detection element is located within the wrapping range of the cold jacket; a second temperature detection element is disposed on the bottom of the cryogenic and high-pressure tank.

[0013] In an exemplary embodiment, a vacuum insulation test tank is further included, wherein the low-temperature and high-pressure tank is arranged inside the vacuum insulation test tank; and an evacuation valve is arranged on the vacuum insulation test tank.

[0014] The present invention also provides a safety valve low temperature zone testing method, using the above-mentioned safety valve low temperature zone testing device, comprising the following steps:

[0015] S1. Pass precooling medium into the low temperature and high pressure tank for precooling;

[0016] S2. The test medium is introduced into the low-temperature and high-pressure tank until the pre-cooling medium in the low-temperature and high-pressure tank is completely discharged and the low-temperature and high-pressure tank is filled with the test medium;

[0017] S3. Introduce the test medium into the cooling jacket and keep it flowing to maintain cooling;

[0018] S4. Introduce a pressurizing medium into the low-temperature and high-pressure tank to pressurize the low-temperature and high-pressure tank;

[0019] S5. The safety valve under test suddenly opens to exhaust air, and the pressure value at the time of the sudden opening is recorded.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The safety valve cryogenic test inspection standard stipulates that the temperature difference between the inlet of the tested safety valve and the test medium is ≤30℃ to meet the working condition requirements of liquid helium cryogenic test. The cold jacket installed on the top of the cryogenic and high-pressure tank can ensure that the temperature at the inlet of the tested safety valve is in the temperature zone of the test medium, such as the liquid helium temperature zone, the liquid nitrogen temperature zone, the liquid hydrogen temperature zone, etc. The temperature of the test medium in other areas of the cryogenic and high-pressure tank will gradually increase during the test. The present invention provides a precooling tank and allows the first spiral section of the pressurized pipeline to flow through the precooling tank, so as to fully precool the pressurized medium in the pressurized pipeline. The precooled pressurized medium then flows through the second spiral section in the cryogenic and high-pressure tank, and continuously provides cold energy during the pressurization of the cryogenic and high-pressure tank to prevent the temperature of the test medium in other areas of the cryogenic and high-pressure tank from rising, thereby ensuring that the temperature difference between the inlet of the tested safety valve and the test medium is ≤30℃ to meet the working condition requirements of liquid helium cryogenic test. The present invention can realize the performance test of the cryogenic safety valve in the liquid helium temperature zone (4K, -269°C) with a test pressure within 2 inches and lower than the specification of 16Barg, and meet the performance test conditions of the cryogenic safety valve in the liquid nitrogen, liquid hydrogen and liquid helium temperature zones. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of a safety valve low temperature zone testing device disclosed in a specific embodiment of the present invention;

[0024] Figure 2 for Figure 1 A top view of

[0025] Figure 3 for Figure 2 Middle AA section view;

[0026] Figure 4 for Figure 3 Enlarged view of the middle D part;

[0027] Figure 5 for Figure 3 Enlarged view of middle E part;

[0028] Figure 6 for Figure 2 Middle BB section view;

[0029] Figure 7 for Figure 2 Middle CC section view;

[0030] Figure 8 It is a structural schematic diagram of a cold jacket disclosed in a specific embodiment of the present invention;

[0031] Fig. 9 for Figure 8 A cross-sectional view of

[0032] Among them, 1. vacuum insulation test tank; 2. support leg; 3. evacuation valve; 4. temperature measurement channel; 5. second valve; 6. low temperature and high pressure tank output pipeline; 7. fourth valve; 8. low temperature and high pressure tank spare output pipeline; 9. sixth valve; 10. tested safety valve; 11. pressure measuring pipeline; 12. pressure detection element; 13. safety valve; 14. third valve; 15. pressurization pipeline; 16. pre-cooling tank; 17. first valve; 18. total input pipeline; 19. test bracket; 20. fifth valve; 21. cold jacket output pipeline; 22. first spiral section; 23. flange; 24. cold jacket; 25. first temperature detection element; 26. first fixing device; 27. second spiral section; 28. second fixing device; 29. ​​second temperature detection element; 30. low temperature and high pressure tank; 31. low temperature and high pressure tank input pipeline; 32. cold jacket input pipeline; 33. filter; 34. reinforcement rib; 35. guide plate. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. People familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0035] It should also be noted that in the embodiments of the present application, the same figure mark is used to represent the same component or the same part.

[0036] The purpose of the present invention is to provide a safety valve low temperature zone testing device to solve the problem in the prior art that it is impossible to perform effective and reliable performance testing on the safety valve under low temperature conditions, especially in the liquid helium temperature zone.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Please refer to Figures 1 to 9 This embodiment provides a safety valve low temperature zone test device. For details, please refer to Figure 3 and Figure 4 , including a cryogenic and high-pressure tank 30, the top of which is sealed and docked with the safety valve 10 to be tested, which can be achieved through a flange 23 and a sealing ring. A filter 33 is provided at the through hole of the flange 23 to prevent liquid or particulate impurities from entering the safety valve 10 to be tested. A cold jacket 24 is provided on the outer periphery of one end of the cryogenic and high-pressure tank 30 close to the safety valve 10 to be tested, which is used to provide a low-temperature zone at the inlet of the safety valve 10 to be tested, such as a liquid helium temperature zone, a liquid nitrogen temperature zone, a liquid hydrogen temperature zone, etc. The cooling medium in the cold jacket 24 adopts the test medium used in the safety valve performance test, which is used to simulate the working environment of storing or transporting the medium in actual work.

[0039] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 , and also includes a low-temperature and high-pressure tank input pipeline 31, a pressurizing pipeline 15, a cold jacket input pipeline 32, a low-temperature and high-pressure tank output pipeline 6 and a cold jacket output pipeline 21.

[0040] The cryogenic and high-pressure tank input pipeline 31 is used to connect the cryogenic and high-pressure tank 30 with the precooling medium source or the test medium source. When the cryogenic and high-pressure tank input pipeline 31 connects the cryogenic and high-pressure tank 30 with the precooling medium source, it is used to precool the interior of the cryogenic and high-pressure tank 30 from room temperature to the precooling temperature; when the cryogenic and high-pressure tank input pipeline 31 connects the cryogenic and high-pressure tank 30 with the test medium source, the test medium is introduced into the cryogenic and high-pressure tank 30 to squeeze out the precooling medium inside the cryogenic and high-pressure tank 30, and the cryogenic and high-pressure tank 30 is filled with the test medium, providing a simulated environment for the performance test of the safety valve. The precooling medium generally uses liquid nitrogen with a lower cost, and the test medium selects low-temperature media such as liquid helium, liquid hydrogen, and liquid nitrogen according to the test requirements.

[0041] The low-temperature and high-pressure tank output pipeline 6 is used to connect the low-temperature and high-pressure tank 30 with the outside world so that the pre-cooling medium can be discharged smoothly. When the test medium is input, if the test medium flows out from the outlet, it means that the test medium has filled the low-temperature and high-pressure tank 30, and then the input is stopped.

[0042] Specifically, the outlet of the cryogenic and high-pressure tank input pipeline 31 extends to the bottom of the cryogenic and high-pressure tank 30, so that the precooling medium or the test medium is poured in from the bottom of the cryogenic and high-pressure tank 30, and the inlet of the cryogenic and high-pressure tank output pipeline 6 is set at the top of the cryogenic and high-pressure tank 30. When the test medium is poured in from the bottom through the cryogenic and high-pressure tank input pipeline 31, the precooling medium is squeezed upward, so that the precooling medium enters the cryogenic and high-pressure tank output pipeline 6 from the inlet at the top and is then discharged.

[0043] The pressurized pipeline 15 is used to connect the cryogenic and high-pressure tank 30 and the pressurized medium source. After the test simulation environment is stable, the inside of the cryogenic and high-pressure tank 30 is pressurized to a certain pressure value to make the safety valve 10 under test jump suddenly, thereby testing whether the jump pressure of the safety valve 10 under test is qualified. The pressurized medium connected by the pressurized pipeline 15 is generally in the form of gas corresponding to the test medium, such as helium, hydrogen, nitrogen, etc.

[0044] The cold jacket input pipeline 32 is used to connect the cold jacket 24 and the test medium source. Under the cooling effect of the cold jacket 24 filled with the test medium, the temperature at the inlet of the safety valve 10 under test is in the low temperature zone of the test medium, such as the liquid helium temperature zone, the liquid nitrogen temperature zone, the liquid hydrogen temperature zone, etc. The cold jacket output pipeline 21 is used to connect the cold jacket 24 and the outside world. It is opened at the same time as the cold jacket input pipeline 32 so that the test medium keeps flowing in the cold jacket 24, continuously providing cold energy, so that the temperature at the inlet of the safety valve 10 under test is always in the low temperature zone of the test medium.

[0045] Please refer to Figure 8 and Fig. 9 The cooling jacket 24 is provided with guide plates 35 staggered up and down, which can make the cooling medium flow in an S-shaped path along the height direction of the cooling jacket 24. The S-shaped flowing cooling medium can keep the temperature of the high and low places in the package range of the cooling jacket 24 balanced, and will not cause the cooling medium to accumulate at the bottom of the cooling jacket 24 and then flow out from the high places, resulting in uneven temperatures above and below. In addition, the temperature of each part of the cooling jacket 24 can be ensured to be as uniform as possible by appropriately accelerating the flow rate of the cooling medium, provided that the refrigeration effect is guaranteed.

[0046] The safety valve cryogenic test inspection standard stipulates that the temperature difference between the inlet of the tested safety valve 10 and the temperature of the test medium is ≤30℃ to meet the working condition requirements of the liquid helium cryogenic test. The cold jacket 24 set on the top of the cryogenic and high-pressure tank 30 can ensure that the temperature at the inlet of the tested safety valve 10 is in the temperature zone of the test medium, while the temperature of the test medium in other areas of the cryogenic and high-pressure tank 30 will gradually increase during the test due to the influence of the external environment. Please refer to Figure 3 In this embodiment, a precooling tank 16 is provided, and the precooling tank 16 is used to fill the precooling medium. The pressurizing pipeline 15 is provided with a first spiral section 22 and a second spiral section 27. The first spiral section 22 is located inside the precooling tank 16, so that the pressurized medium in the pressurizing pipeline 15 is first precooled and then enters the low-temperature and high-pressure tank 30. In the process of pressurizing the low-temperature and high-pressure tank 30, cold energy is continuously provided to the test medium in the low-temperature and high-pressure tank 30 to prevent the temperature of the test medium in other areas of the low-temperature and high-pressure tank 30 from rising, thereby ensuring that the temperature difference between the inlet of the safety valve 10 under test and the temperature of the test medium is ≤30°C, thereby meeting the working condition requirements of the liquid helium low-temperature test. The spiral tube is used to extend the flow path and flow time of the pressurizing pipeline 15 in the precooling tank 16, improve the heat exchange effect, and fully cool the pressurized medium in the pressurizing pipeline 15. The second spiral section 27 is located inside the cryogenic and high-pressure tank 30. Similarly, the spiral tube is used to extend the flow path and flow time of the pressurized pipeline 15 in the cryogenic and high-pressure tank 30, thereby improving the heat exchange effect, so that the cold energy of the cooled pressurized medium can be fully absorbed by the gradually heated test medium in the cryogenic and high-pressure tank 30, so that the temperature of the test medium in the cryogenic and high-pressure tank 30 is always maintained within the qualified range.

[0047] Specifically, the first spiral section 22 can be set to be a straight line in and a spiral out, or a spiral in and a straight line out, or a spiral in and a spiral out. Similarly, the second spiral section 27 can also be set to be a straight line down and a spiral up, or a spiral down and a straight line up, or a spiral down and a spiral up. The second spiral section 27 in this embodiment is preferably set to first extend downward to the bottom of the low-temperature and high-pressure tank 30 through the spiral section, and then extend upward to the top of the low-temperature and high-pressure tank 30 through the straight section, and the outlet of the pressurized pipeline 15 is set at the top of the low-temperature and high-pressure tank 30. The advantage of such a setting is that during the downward extension of the pressurized pipeline 15, the pressurized medium inside the pressurized pipeline 15 and the test medium outside the pressurized pipeline 15 are fully exchanged with heat through the second spiral section 27. After reaching the bottom of the low-temperature and high-pressure tank 30, the pressurized medium inside the pressurized pipeline 15 absorbs a certain amount of heat, the temperature rises, and flows to the top of the low-temperature and high-pressure tank 30 as soon as possible through the straight section, and enters the low-temperature zone formed by the cold jacket 24, so as to reduce the secondary heat exchange in the upstream process and minimize the influence of the thermal short circuit phenomenon in the heat exchange process.

[0048] Furthermore, the cryogenic and high-pressure tank input pipeline 31 and the cold jacket input pipeline 32 are converged into a total input pipeline 18 at one end away from the cryogenic and high-pressure tank 30 and the cold jacket 24, and the total input pipeline 18 is connected to a precooling medium source or a test medium source. When the total input pipeline 18 is connected to the precooling medium source, it is used to precool the interior of the cryogenic and high-pressure tank 30 and the cold jacket 24 from room temperature to the precooling temperature; when the total input pipeline 18 is connected to the test medium source, it is used to pass the test medium into the cryogenic and high-pressure tank 30 and the cold jacket 24 to provide a simulated environment for the performance test of the safety valve.

[0049] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 A first valve 17 is provided on the total input pipeline 18, a second valve 5 is provided on the low-temperature and high-pressure tank input pipeline 31, a third valve 14 is provided on the pressurizing pipeline 15, a fourth valve 7 is provided on the low-temperature and high-pressure tank output pipeline 6, and a fifth valve 20 is provided on the cold jacket output pipeline 21.

[0050] During precooling, the main input pipeline 18 is connected to the precooling medium source, the first valve 17, the second valve 5, the fourth valve 7, and the fifth valve 20 are opened, and the third valve 14 is closed. The precooling medium is introduced into the low-temperature and high-pressure tank 30 and the cooling jacket 24 for precooling until the precooling medium flows out of the low-temperature and high-pressure tank output pipeline 6 and the cooling jacket output pipeline 21, and the first valve 17 and the second valve 5 are closed.

[0051] When the test medium is introduced into the low-temperature and high-pressure tank 30 and the cold jacket 24, the main input pipeline 18 is connected to the test medium source, the first valve 17, the second valve 5, the fourth valve 7, and the fifth valve 20 are opened, and the third valve 14 is closed until the test medium flows out of the low-temperature and high-pressure tank output pipeline 6 and the cold jacket output pipeline 21. The second valve 5 and the fourth valve 7 are closed to block the circulation of the test medium in the low-temperature and high-pressure tank input pipeline 31 and the low-temperature and high-pressure tank output pipeline 6, and the first valve 17 and the fifth valve 20 remain open to keep the low-temperature test medium circulating in the cold jacket 24.

[0052] During the test, the second valve 5 and the fourth valve 7 remain closed, the first valve 17 and the fifth valve 20 remain open, and the third valve 14 is opened to introduce the pressurized medium into the low-temperature and high-pressure tank 30 for pressurization.

[0053] As a preferred solution of this embodiment, the diameters of the total input pipeline 18, the low-temperature and high-pressure tank input pipeline 31, and the cold jacket input pipeline 32 are larger than the diameter of the pressurizing pipeline 15. In order to allow the precooling medium and the test medium to quickly fill the low-temperature and high-pressure tank 30 and the cold jacket 24 during the precooling stage and the stage of passing the test medium into the low-temperature and high-pressure tank 30 and the cold jacket 24, the diameters of the total input pipeline 18, the low-temperature and high-pressure tank input pipeline 31, and the cold jacket input pipeline 32 are set as large as possible within a reasonable range; in order to improve the pressure adjustment accuracy during the test stage, the diameter of the pressurizing pipeline 15 is set as small as possible within a reasonable range.

[0054] This embodiment is also provided with a cryogenic and high-pressure tank backup output pipeline 8 connected to the interior of the cryogenic and high-pressure tank 30, which is used to prevent the backup pipeline of the cryogenic and high-pressure tank 30 from malfunctioning. A sixth valve 9 is provided on the cryogenic and high-pressure tank backup output pipeline 8, and the opening and closing timing of the sixth valve 9 is the same as that of the fourth valve 7 on the cryogenic and high-pressure tank output pipeline 6.

[0055] It also includes a pressure measuring pipeline 11, on which a pressure detection element 12 is arranged. The pressure measuring pipeline 11 is connected to the position inside the low-temperature high-pressure tank 30 near the safety valve 10 to be tested, and is used to confirm whether the pressure in the tank meets the test requirements, read the pressure when the safety valve 10 to be tested suddenly jumps during the test phase, confirm whether the performance of the safety valve 10 to be tested can withstand the required pressure, and record the pressure change after the safety valve 13 suddenly jumps. When the reading of the pressure detection element 12 reaches the limit working pressure value, the fourth valve 7 on the pressurizing pipeline 15 is closed in time to stop pressurizing.

[0056] Furthermore, a safety valve 13 for ensuring safe operation is provided on the pressure measuring pipeline 11. Note that the safety valve 13 is a standard safety valve, not the safety valve 10 to be tested in this embodiment.

[0057] A first temperature detection element 25 is arranged on the top of the cryogenic and high-pressure tank 30, and the first temperature detection element 25 is located within the wrapping range of the cold sleeve 24. A second temperature detection element 29 is arranged on the bottom of the cryogenic and high-pressure tank 30. The first temperature detection element 25 and the second temperature detection element 29 are used to read the temperature at the inlet of the tested safety valve 10 and the bottom of the cryogenic and high-pressure tank 30 in real time during the test phase to ensure that the temperature difference between the two is within the range of 30°C.

[0058] Specifically, a first fixing device 26 for mounting the first temperature detection element 25 is provided on the top of the cryogenic and high-pressure tank 30, and a second fixing device 28 for mounting the second temperature detection element 29 is provided on the bottom of the cryogenic and high-pressure tank 30. A plurality of fixing parts for fixing the temperature detection elements are provided at different heights of the first fixing device 26 and the second fixing device 28 to achieve adjustable positions of the temperature detection elements. At the same time, one or more temperature detection elements other than the first temperature detection element 25 and the second temperature detection element 29 may be provided to detect the temperatures at multiple different positions in the cryogenic and high-pressure tank 30 to ensure that the temperature during the test is in a normal state.

[0059] In order to further ensure the low temperature environment of the detection experiment, the present embodiment also includes a vacuum insulation test tank 1, and a low temperature and high pressure tank 30 is arranged inside the vacuum insulation test tank 1. The low temperature and high pressure tank 30 and the vacuum insulation test tank 1 can be arranged in an integrated manner or in a separate and detachable manner. The vacuum insulation test tank 1 is provided with an evacuation valve 3 and a temperature measurement channel 4. The evacuation valve 3 is used to evacuate the inside of the vacuum insulation test tank 1; the temperature measurement channel 4 extends to the inside of the low temperature and high pressure tank 30, and the leads of the first temperature detection element 25 and the second temperature detection element 29 are led out from the temperature measurement channel 4 and connected to the computer.

[0060] A reinforcing rib 34 is provided between the inner wall of the vacuum insulation test tank 1 and the outer wall of the low-temperature and high-pressure tank 30, and a support leg 2 is provided at the bottom of the vacuum insulation test tank 1. A test bracket 19 is provided on one side of the vacuum insulation test tank 1. Since there are many components provided on the pressure measuring pipeline 11 and the weight is large, the test bracket 19 is specially provided to support the pressure measuring pipeline 11.

[0061] Embodiment 2

[0062] This embodiment provides a method for testing the low temperature zone of a safety valve 13, using the low temperature zone testing device for the safety valve 13 described in the first embodiment, including the following steps:

[0063] Preparation before testing: Install the safety valve 10 to be tested on the flange 23, start the evacuation valve 3, evacuate the vacuum insulation test tank 1, and when the vacuum degree reaches the process requirement, close the evacuation valve 3. The computer is connected to the leads of the first temperature detection element 25 and the second temperature detection element 29 in the temperature measurement pipeline, collects the initial temperature data, and confirms whether the initial temperature is normal.

[0064] S1. The total input pipeline 18 is connected to the pre-cooling medium source, the first valve 17 of the total input pipeline 18, the second valve 5 of the cryogenic and high-pressure tank input pipeline 31, the fourth valve 7 of the cryogenic and high-pressure tank output pipeline 6, and the fifth valve 20 of the cooling jacket output pipeline 21 are opened, the third valve 14 of the pressurizing pipeline 15 is closed, and the pre-cooling medium is introduced into the cryogenic and high-pressure tank 30 and the cooling jacket 24 for pre-cooling until the pre-cooling medium flows out of the cryogenic and high-pressure tank output pipeline 6 and the cooling jacket output pipeline 21, and the first valve 17 of the total input pipeline 18 and the second valve 5 of the cryogenic and high-pressure tank input pipeline 31 are closed.

[0065] S2. The total input pipeline 18 is connected to the test medium source, the first valve 17 of the total input pipeline 18, the second valve 5 of the cryogenic and high-pressure tank input pipeline 31, the fourth valve 7 of the cryogenic and high-pressure tank output pipeline 6, and the fifth valve 20 of the cold jacket output pipeline 21 are opened, the third valve 14 of the pressurizing pipeline 15 is closed, and the test medium is introduced into the cryogenic and high-pressure tank 30 and the cold jacket 24 until the test medium flows out of the cryogenic and high-pressure tank output pipeline 6 and the cold jacket output pipeline 21, the second valve 5 of the cryogenic and high-pressure tank input pipeline 31 and the fourth valve 7 of the cryogenic and high-pressure tank output pipeline 6 are closed to block the circulation of the test medium in the cryogenic and high-pressure tank input pipeline 31 and the cryogenic and high-pressure tank output pipeline 6, and the first valve 17 of the total input pipeline 18 and the fifth valve 20 of the cold jacket output pipeline 21 remain open to keep the low-temperature test medium circulating in the cold jacket 24.

[0066] S3. Open the third valve 14 of the pressurizing pipeline 15 to introduce the pressurized medium precooled by the precooling tank 16 into the low-temperature and high-pressure tank 30 to pressurize the low-temperature and high-pressure tank 30 .

[0067] S4. The safety valve 10 under test suddenly jumps and opens to exhaust gas, and the pressure value of the pressure detection element 12 during the sudden jump is recorded; after exhausting gas, the safety valve 10 under test falls back and closes, and continues to increase pressure to perform the next sudden jump and exhaust gas; the pressure values ​​of the safety valve 10 under test suddenly jumping 5 times are recorded in total.

[0068] S5. Maintain the pressure above 90% of the set value for 6 minutes, close the third valve 14 of the pressurizing pipeline 15, and the test is completed.

[0069] In S4 and S5, the reading T of the first temperature detection element 25 is recorded in real time. 1 and the reading T of the second temperature detection element 29 2 , T 2 -T 1 The test process is normal when the temperature is ≤30℃.

[0070] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0072] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0073] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0074] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0075] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0076] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A safety valve low temperature zone testing device, characterized in that: It includes a low-temperature and high-pressure tank, a low-temperature and high-pressure tank input pipeline, a pressurizing pipeline, a cold jacket input pipeline, a low-temperature and high-pressure tank output pipeline and a cold jacket output pipeline, and a pre-cooling tank. The top of the low-temperature and high-pressure tank is sealed and connected to the safety valve to be tested, and a cold jacket is provided on the outer periphery of the top of the low-temperature and high-pressure tank; the low-temperature and high-pressure tank is connected to a pre-cooling medium source or a test medium source through the low-temperature and high-pressure tank input pipeline, is connected to a pressurizing medium source through the pressurizing pipeline, and is connected to the outside world through the low-temperature and high-pressure tank output pipeline; the cold jacket is connected to the pre-cooling medium source or the test medium source through the cold jacket input pipeline, and is connected to the outside world through the cold jacket output pipeline; the pressurizing pipeline is provided with a first spiral section and a second spiral section that are connected to each other, the first spiral section is located inside the pre-cooling tank, and the second spiral section is located inside the low-temperature and high-pressure tank.

2. The safety valve low temperature zone testing device according to claim 1, characterized in that: The outlet of the low-temperature and high-pressure tank input pipeline extends to the bottom of the low-temperature and high-pressure tank, and the inlet of the low-temperature and high-pressure tank output pipeline is arranged at the top of the low-temperature and high-pressure tank.

3. The safety valve low temperature zone testing device according to claim 1, characterized in that: The pressurized pipeline extends to the bottom of the cryogenic and high-pressure tank through the second spiral section and then extends upward to the top of the cryogenic and high-pressure tank. The outlet of the pressurized pipeline is arranged at the top of the cryogenic and high-pressure tank.

4. The safety valve low temperature zone testing device according to claim 1, characterized in that: The low-temperature and high-pressure tank input pipeline and the cold jacket input pipeline are converged into a total input pipeline at one end away from the low-temperature and high-pressure tank and the cold jacket.

5. The low temperature zone testing device for safety valve according to claim 4 is characterized in that: A first valve is arranged on the total input pipeline, a second valve is arranged on the low-temperature and high-pressure tank input pipeline, a third valve is arranged on the pressurizing pipeline, a fourth valve is arranged on the low-temperature and high-pressure tank output pipeline, and a fifth valve is arranged on the cold jacket output pipeline.

6. The safety valve low temperature zone testing device according to claim 1, characterized in that: It also includes a low-temperature and high-pressure tank spare output pipeline connected to the interior of the low-temperature and high-pressure tank, and a sixth valve is arranged on the low-temperature and high-pressure tank spare output pipeline.

7. The safety valve low temperature zone testing device according to claim 1, characterized in that: It also includes a pressure measuring pipeline provided with a pressure detection element, and the pressure measuring pipeline is connected to a position inside the low-temperature and high-pressure tank close to the safety valve to be tested.

8. The safety valve low temperature zone testing device according to claim 1, characterized in that: A first temperature detection element is disposed on the top of the cryogenic and high-pressure tank, and the first temperature detection element is located within the wrapping range of the cold jacket; a second temperature detection element is disposed on the bottom of the cryogenic and high-pressure tank.

9. The low temperature zone testing device for a safety valve according to any one of claims 1 to 8, characterized in that: It also includes a vacuum insulation test tank, the low-temperature and high-pressure tank is arranged inside the vacuum insulation test tank; and the vacuum insulation test tank is provided with an evacuation valve.

10. A safety valve low temperature zone testing method, characterized in that: The use of the safety valve low temperature zone testing device according to any one of claims 1 to 9 comprises the following steps: S1. Pass precooling medium into the low temperature and high pressure tank for precooling; S2. The test medium is introduced into the low-temperature and high-pressure tank until the pre-cooling medium in the low-temperature and high-pressure tank is completely discharged and the low-temperature and high-pressure tank is filled with the test medium; S3. Introduce the test medium into the cooling jacket and keep it flowing to maintain cooling; S4. Introduce a pressurizing medium into the low-temperature and high-pressure tank to pressurize the low-temperature and high-pressure tank; S5. The safety valve under test suddenly opens to exhaust air, and the pressure value at the time of the sudden opening is recorded.

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