Sealing ring performance test system and method

Abstract

The invention provides a sealing ring performance test system and method. The sealing ring performance test system provided by the invention comprises a test tool which comprises an upper flange and a lower flange which are matched with each other, the lower flange is provided with a sealing groove and a leak detection hole communicated with the sealing groove, the sealing groove is formed in one side, facing the upper flange, of the lower flange and is used for installing a sealing ring to be tested, and the leak detection hole is communicated with the leak detection hole; one end of the leak detection hole is communicated with the sealing groove, the other end of the leak detection hole is used for detachably installing different performance testing devices, and the different performance testing devices comprise a cold and hot state leakage performance testing device, a water pressure performance testing device, a thermal cycle testing device and a stress relaxation testing device. The system and the method provided by the invention are used for testing the performance of the sealing ring and ensuring the sealing effect and the reliability of the sealing ring under the actual working condition.

Description

Technical Field

[0001] The present application relates to the field of sealing technology, and in particular to a sealing ring performance testing system and method. Background Art

[0002] As my country's nuclear power plants gradually develop in the direction of large capacity, high reliability and high safety, higher requirements are placed on nuclear power sealing. Therefore, it is particularly urgent to carry out independent research and development of sealing rings with high sealing performance.

[0003] Due to the harsh and complex application scenarios of sealing rings, places with high safety requirements such as nuclear power plants rely on sealing rings to prevent leakage and ensure the safety and stable operation of the system. Performance testing can verify the pressure resistance, temperature resistance and long-term reliability of the sealing ring, ensuring that it can meet the design requirements in actual applications and avoid safety hazards caused by sealing failure. In addition, performance testing can also optimize product design, improve its quality and service life, reduce maintenance and replacement costs, and enhance the competitiveness and dependence of independently developed products.

[0004] Therefore, there is an urgent need for a sealing ring performance testing system to implement performance testing of the sealing ring and ensure the sealing effect and reliability of the sealing ring under actual working conditions. Summary of the invention

[0005] In view of this, the present application provides a sealing ring performance testing system and method to implement performance testing of the sealing ring and ensure the sealing effect and reliability of the sealing ring under actual working conditions.

[0006] Specifically, the present application is implemented through the following technical solutions: The first aspect of the present application provides a sealing ring performance test system, the system comprising: a test fixture, comprising a matching upper flange and a lower flange, the lower flange being provided with a sealing groove and a leak detection hole connected to the sealing groove, the sealing groove being provided on a side of the lower flange facing the upper flange, for installing a sealing ring to be tested, one end of the leak detection hole being connected to the sealing groove, and the other end being used for detachably installing different performance test devices, the different performance test devices comprising a cold and hot state leakage performance test device, a water pressure performance test device, a thermal cycle test device and a stress relaxation test device; Hot and cold leakage performance test device, used to test the changing relationship between hot and cold load and displacement of the test fixture; Water pressure performance testing device, used to test the relationship between the leakage performance of the test fixture and the water pressure value; A thermal cycle test device, used to increase the temperature of the test fixture to a first preset threshold value, and reduce the temperature of the test fixture to a second preset threshold value, so as to detect the relationship between the leakage state of the test fixture and the temperature change; The stress relaxation testing device is used to provide a compressive load to the test fixture according to the changing relationship between the cold and hot state loads and displacements obtained by the cold and hot state leakage performance testing device, detect the load change of the test fixture after compression, and calculate the stress relaxation rate of the sealing ring.

[0007] A second aspect of the present application provides a sealing ring performance testing method, the method comprising: Performing a cold and hot state leakage performance test on the test fixture of the sealing ring, wherein the cold and hot state leakage performance test at least includes detecting the compression load and leakage rate of the test fixture at a first preset temperature and a second preset temperature, calculating the compression amount based on the detection result, and obtaining the change relationship between the cold and hot state load and displacement; Performing a water pressure performance test on the test fixture to test the relationship between the leakage performance of the test fixture and the water pressure value; Performing a thermal cycle test on the test tool, increasing the temperature of the test tool to the first preset temperature, and decreasing the temperature of the test tool to the second preset temperature, and detecting a relationship between a leakage state of the test tool and a temperature change; A stress relaxation test is performed on the test fixture, wherein the stress relaxation test includes determining a compression load according to the cold and hot leakage performance tests, applying a compression load to the test fixture, detecting a load change of the test fixture after compression, and calculating a stress relaxation rate of the sealing ring.

[0008] The sealing ring performance testing system and method provided in the present application include a test fixture composed of a matching upper flange and a lower flange. Among them, the lower flange is provided with a sealing groove and a leak detection hole connected to the sealing groove. The sealing groove is provided on the side of the lower flange facing the upper flange, and is used to install the sealing ring to be tested. One end of the leak detection hole is connected to the sealing groove, and the other end is used to detachably install different performance testing devices. The different performance testing devices include cold and hot state leakage performance testing devices, water pressure performance testing devices, thermal cycle testing devices and stress relaxation testing devices. Among them, the cold and hot state leakage performance testing device is used to test the changing relationship between the cold and hot state loads and displacements of the test fixture; the water pressure performance testing device is used to test the changing relationship between the leakage performance of the test fixture and the water pressure value; the thermal cycle testing device is used to detect the changing relationship between the leakage state of the test fixture and the temperature; the stress relaxation testing device is used to detect the load change of the test fixture after compression and calculate the stress relaxation rate of the sealing ring. In the performance test process of the sealing ring, starting from the environment of the nuclear power plant used, the ambient temperature of the nuclear power plant changes repeatedly, and the temperature difference is large. Compared with the fixed temperature environment, the repeatedly changing large difference environment will cause the performance of the sealing ring to decay. In order to improve the stability and durability of the sealing ring applied to the nuclear power plant scene, the present invention first realizes the leakage performance of the sealing ring under the cold and hot states of two temperatures with a difference greater than the threshold through the cold and hot cycle test, and then adds the cycle of heating and cooling tests. Starting from the nuclear power plant scene, it not only realizes the performance test under the temperature environment change with a large jump amplitude, but also realizes repeated and multiple stepped and large temperature changes. Through temperature changes, various working environments when the nuclear power plant scene is used are simulated, and the leakage performance of the sealing ring in various working scenarios is comprehensively tested, which fully guarantees the stability of the sealing ring. In addition, in the first aspect, a plurality of different test devices are designed for different performances of the sealing ring, and these multiple different test devices are integrated into a sealing ring performance test system. When determining the performance of the sealing ring to be tested, it is only necessary to open the test device corresponding to the performance in the sealing ring performance test system to realize the performance test of the sealing ring, which is convenient and fast. Secondly, when testing the different performances of the sealing ring, different test devices are designed, which can optimize the performance test process, improve the accuracy of the performance test, and allow different performance test items to be independently designed or implemented, which improves the flexibility and adaptability of the performance test and the overall test efficiency. Thirdly, through performance testing, the pressure resistance, temperature resistance and long-term reliability of the sealing ring can be verified to ensure that it can meet the design requirements in actual applications, avoid safety hazards caused by sealing failure, ensure the safety and stable operation of the system, ensure the sealing effect and reliability of the sealing ring under actual working conditions, ensure that the sealing ring can meet the stringent safety and performance requirements of nuclear power plants, reduce dependence on imported products, and enhance the independent guarantee capabilities of my country's nuclear power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of a test tooling according to an exemplary embodiment of the present application; Figure 2 This is a schematic structural diagram of a cold and hot state leakage performance testing device according to an exemplary embodiment of the present application; Figure 3 A schematic structural diagram of a water pressure performance testing device according to an exemplary embodiment of the present application; Figure 4 A schematic diagram of the structure of a thermal cycle test device shown in an exemplary embodiment of the present application; Figure 5 This is another structural schematic diagram of a thermal cycle testing device according to an exemplary embodiment of the present application; Figure 6 A schematic structural diagram of a stress relaxation testing device according to an exemplary embodiment of the present application; Figure 7 A flow chart of Embodiment 1 of the sealing ring performance testing method provided in the present application; Figure 8 A schematic diagram of a sealing characteristic curve shown in an exemplary embodiment of the present application; Description of reference numerals: 1: Test tooling 11: Upper flange 12: Lower flange 13: Sealing groove 14: Leak detection hole 15: Sealing ring 2: Cold and hot leakage performance test device 21: Helium mass spectrometer leak detector 22: Displacement sensor 23: Load sensor 24: Pressure gauge 25: Valve 26: Helium tank 3: Water pressure performance testing device 31: Hydraulic test pump 32: Pressure gauge 33: Load sensor 34: Displacement sensor 35: Exhaust valve 36: Water inlet valve 4: Thermal cycle test device 41: First thermal cycle test device 411: Circulation pump 412: Water storage device 413: Temperature control mechanism 414: Electric sprinkler valve 415: Electric water inlet valve 416: Plunger pump 417: Fuel tank 418: Electric exhaust valve 419: Electric drain valve 420: Safety valve 42: Second thermal cycle test device 421: Hydraulic pump 422: Leak Detector 423: Upper heating plate 424: Lower heating plate 425: Pressure gauge 426: Gas cylinder pressure gauge 427: Pressure reducing valve 428: Helium tank 429: Temperature measuring hole 430: Exhaust valve 431: Sealing ring 432: Induction heating furnace 5: Stress relaxation test device 51: Load sensor 52: Displacement sensor 6: Pressure structure 61: Upper clamping part 62: Lower clamping part 63: Hydraulic cylinder 64: Test console 65: Testing machine table DETAILED DESCRIPTION

[0010] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0011] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0012] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0013] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0014] The sealing ring performance test system provided in this embodiment comprises: a test fixture 1, comprising a matching upper flange 11 and a lower flange 12, wherein the lower flange 12 is provided with a sealing groove 13 and a leak detection hole 14 connected to the sealing groove 13, wherein the sealing groove 13 is provided on a side of the lower flange 12 facing the upper flange 11, and is used to install a sealing ring to be tested, wherein one end of the leak detection hole 14 is connected to the sealing groove 13, and the other end is used to detachably install different performance test devices, wherein the different performance test devices include a cold and hot leakage performance test device 2, a water pressure performance test device 3, a thermal cycle test device 4, and a stress relaxation test device 5; The hot and cold leakage performance test device 2 is used to test the changing relationship between the hot and cold loads and displacements of the test fixture 1; A water pressure performance testing device 3, used to test the relationship between the leakage performance of the test fixture 1 and the water pressure value; The thermal cycle test device 4 is used to increase the temperature of the test fixture 1 to a first preset threshold value, and reduce the temperature of the test fixture 1 to a second preset threshold value, so as to detect the relationship between the leakage state of the test fixture 1 and the temperature change; The stress relaxation testing device 5 is used to provide a compressive load to the test fixture 1 according to the changing relationship between the cold and hot state loads and displacements obtained by the cold and hot state leakage performance testing device 2, detect the load change of the test fixture 1 after compression, and calculate the stress relaxation rate of the sealing ring.

[0015] Specifically, the sealing ring performance testing system is used to test various performances of the sealing ring, and includes a test tool 1 . Figure 1 This is a schematic diagram of the structure of a test tooling according to an exemplary embodiment of the present application. Figure 1The test fixture 1 includes an upper flange 11 and a lower flange 12, which cooperate with each other and are fastened together by a fixing device (such as bolts) to form a closed cavity. The lower flange 12 is provided with a sealing groove 13 and a leak detection hole 14, and the sealing groove 13 and the leak detection hole 14 are connected to each other. The sealing groove 13 is arranged on the side of the lower flange 12 facing the upper flange 11, and is used to install the sealing ring to be tested. The sealing ring to be tested is installed in the sealing groove 13. When the upper flange 11 and the lower flange 12 are fastened together, the sealing ring is pressed, thereby ensuring the tightness inside the test fixture 1. One end of the leak detection hole 14 is connected to the sealing groove 13, and the other end is used for detachably installing different performance test devices. Different performance tests can be performed on the sealing ring through the leak detection hole 14.

[0016] Furthermore, the test fixture 1 also includes two sealing rings 15, and the side of the lower flange 12 facing the upper flange 11 has two grooves, and the two grooves are respectively arranged on both sides of the sealing groove 13, and the two sealing rings 15 correspond to the two grooves, and the sealing rings 15 are squeezed between the upper flange 11 and the lower flange 12.

[0017] In specific implementation, the sealing ring to be tested is installed in the sealing groove 13 of the lower flange 12, and the two sealing rings 15 are respectively installed in the grooves on both sides of the sealing groove 13. The upper flange 11 and the lower flange 12 are tightly connected by a fastening device (such as bolts). During this process, the sealing ring and the two sealing rings 15 are compressed at the same time to form a multiple sealing structure. The corresponding performance testing device is connected through the leak detection hole 14, and a certain pressure or vacuum condition is applied to test the performance of the sealing ring. The multiple sealing design ensures that no medium leakage occurs during the test process, ensuring the stability of the test environment and the accuracy of the results.

[0018] Furthermore, the performance testing device is used to test different performances of the sealing ring, and includes a cold and hot state leakage performance testing device 2, a water pressure performance testing device 3, a thermal cycle testing device 4 and a stress relaxation testing device 5. Among them, the cold and hot state leakage performance testing device 2 is used to test the changing relationship between the cold and hot state loads and displacements of the test fixture 1. The water pressure performance testing device 3 is used to test the changing relationship between the leakage performance of the test fixture 1 and the water pressure value. The thermal cycle testing device 4 is used to increase the temperature of the test fixture 1 to a first preset threshold value, and reduce the temperature of the test fixture 1 to a second preset threshold value, so as to detect the changing relationship between the leakage state of the test fixture 1 and the temperature. The stress relaxation testing device 5 is used to provide a compressive load to the test fixture 1 according to the changing relationship between the cold and hot state loads and displacements obtained by the cold and hot state leakage performance testing device 2, detect the load change of the test fixture 1 after compression, and calculate the stress relaxation rate of the sealing ring.

[0019] Optionally, the system further includes a pressure structure 6, which includes an upper clamping portion 61, a lower clamping portion 62 arranged opposite to the upper clamping portion 61, and a hydraulic cylinder 63 arranged at the bottom of the lower clamping portion, and the test tool 1 is clamped between the upper clamping portion 61 and the lower clamping portion 62.

[0020] Furthermore, the pressure structure 6 further includes a test console 64 and a test machine table 65. The test console 64 is connected to the test tool 1, and the test machine table 65 is used to place the test tool 1.

[0021] Furthermore, the hydraulic cylinder is used to apply pressure to the test fixture 1. The pressure structure 6 is used to apply a load to the test fixture 1 when the sealing ring is subjected to a performance test. When the performance of the test is different, the load applied to the test fixture 1 by the pressure structure 6 is also different. When the sealing ring is subjected to a cold and hot state leakage performance test, the pressure structure 6 applies a plurality of preset loads to the test fixture 1 to control the compression and rebound of the test fixture 1.

[0022] Figure 2 This is a schematic diagram of the structure of a cold and hot leakage performance test device 2 shown in an exemplary embodiment of the present application. Figure 2 The cold and hot state leakage performance testing device 2 comprises: A helium mass spectrometer leak detector 21, connected to the leak detection hole 14, for detecting the leakage rate of the test fixture 1 when the load on the test fixture 1 reaches any one of the plurality of preset amplitudes; A displacement sensor 22, one end of which is connected to the upper clamping portion 61 and the other end of which is connected to the lower clamping portion 62, for detecting the displacement of the test fixture 1 under different temperatures and compression loads, and calculating the changing relationship between the cold and hot loads and displacements; The cold and hot state leakage performance testing device 2 is also used to determine the compression amount of the sealing ring when it is in the initial sealing state according to the changing relationship between the cold and hot state loads and displacements.

[0023] The plurality of preset amplitudes at least include a first preset amplitude and a second preset amplitude, and the second preset amplitude exceeds N times the first preset amplitude, where N is a positive integer greater than 8. For example, the first preset amplitude may be room temperature, and the second preset amplitude may be 350°. Based on the adjustment of different temperature amplitudes, the working environment with multiple large jump amplitudes in the scenario where the sealing ring is used in a nuclear power plant is directly simulated, and the performance of the sealing ring is tested to improve the stability of the sealing ring in a large-scale changing environment.

[0024] For details, please refer to Figure 2The cold and hot state leakage performance test device 2 includes a helium mass spectrometer leak detector 21 and a displacement sensor 22. The helium mass spectrometer leak detector 21 is connected to the leak detection hole 14 of the test fixture 1, one end of the displacement sensor 22 is connected to the upper clamping part 61 of the pressure structure 6, and the other end of the displacement sensor 22 is connected to the lower clamping part 62 of the pressure structure 6.

[0025] Furthermore, the helium mass spectrometer leak detector 21 is used to detect the leakage rate of the test fixture 1 when the load on the test fixture 1 reaches a preset amplitude. The displacement sensor 22 is used to detect the displacement of the test fixture 1 under different temperatures and compression loads, and calculate the changing relationship between the cold and hot loads and displacements. The cold and hot leakage performance test device 2 is also used to determine the compression of the sealing ring when it is in the initial sealing state based on the calculated changing relationship between the cold and hot loads and displacements.

[0026] Furthermore, the cold and hot leakage performance test device also includes a load sensor 23, a pressure gauge 24, a valve 25, and a helium cylinder 26. The load sensor 23 is used to detect the compression load of the test fixture 1, the pressure gauge 24 is used to detect the pressure of the test fixture 1, the valve 25 is used to control the load on the test fixture 1, and the helium cylinder 26 is used to provide helium to the test fixture 1.

[0027] Figure 3 This is a schematic diagram of the structure of a water pressure performance testing device 3 shown in an exemplary embodiment of the present application. Figure 3 , the water pressure performance testing device 3 comprises: A water pressure test pump 31 is connected to the leak detection hole 14 and is used to inject water into the sealing groove 13. The air in the sealing groove 13 is exhausted through the exhaust hole so that the sealing groove 13 is filled with water. The pressure gauge 32 is disposed between the leak detection hole 14 and the water pressure test pump 31 and is used to detect the pressure of the test fixture 1 during the water injection process and determine the leakage performance based on the pressure change.

[0028] For details, please refer to Figure 3 The hydraulic performance testing device 3 includes a hydraulic test pump 31 and a pressure gauge 32. The hydraulic test pump 31 is connected to the leak detection hole 14 of the test fixture 1. The pressure gauge 32 is arranged between the leak detection hole 14 of the test fixture 1 and the hydraulic test pump 31.

[0029] Furthermore, when the sealing ring is subjected to a water pressure performance test, the pressure-applying structure 6 is used to apply pressure to the test fixture 1. The upper flange 11 of the test fixture 1 includes an exhaust hole, which is communicated with the sealing groove 13.

[0030] The water pressure test pump 31 is used to inject water into the sealing groove 13. At the same time, the air in the sealing groove 13 is discharged under the action of the exhaust hole, and the sealing groove 13 is filled with water. The pressure gauge 32 is used to detect the pressure of the test fixture 1 during the water injection process and determine the leakage performance based on the pressure change. Further, after completing the water pressure performance test, the sealing ring can be taken out and its appearance characteristics can be detected to determine whether it is damaged, thereby determining its leakage performance.

[0031] Furthermore, the water pressure performance testing device 3 also includes a load sensor 33, a displacement sensor 34, an exhaust valve 35, and a water inlet valve 36. The load sensor 33 is used to detect the compressive load on the test fixture 1, and the displacement sensor 34 is used to detect the displacement of the test fixture 1 during the water pressure performance test. The exhaust valve 35 and the water inlet valve 36 work together to control the amount of water injected into the test fixture 1.

[0032] Specifically, the thermal cycle testing device 4 includes a first thermal cycle testing device 41 and a second thermal cycle testing device 42 . Figure 4 This is a schematic diagram of the structure of a first thermal cycle testing device 41 according to an exemplary embodiment of the present application. Figure 4 The first thermal cycle testing device 41 includes a circulation pump 411, a water storage device 412 and a temperature control mechanism 413 arranged in the water storage device 412 for controlling the temperature of the liquid in the water storage device 412, the water outlet of the water storage device 412 is connected to the water inlet of the circulation pump 411, the water outlet of the circulation pump 411 is connected to the leak detection hole 14, the water inlet of the water storage device 412 is connected to the drainage hole of the upper flange 11, and the drainage hole is connected to the sealing groove 13.

[0033] Specifically, due to the different pressures on the test fixture 1, the thermal cycle test device 4 includes a first thermal cycle test device 41 and a second thermal cycle test device 42. When the pressure on the test fixture 1 is lower than the preset value, the thermal cycle test is performed on the sealing ring based on the first thermal cycle test device 41. When the pressure on the test fixture 1 is higher than the preset value, the thermal cycle test is performed on the sealing ring based on the second thermal cycle test device 42.

[0034] Furthermore, the first thermal cycle test device 41 includes a circulation pump 411, a water storage device 412, and a temperature control mechanism 413. The temperature control mechanism 413 is arranged in the water storage device 412, the water outlet of the water storage device 412 is connected to the water inlet of the circulation pump 411, the water outlet of the circulation pump 411 is connected to the leak detection hole 14 of the test fixture 1, the water inlet of the water storage device 412 is connected to the drainage hole of the upper flange 11 of the test fixture 1, and the drainage hole of the upper flange 11 is connected to the sealing groove 13. The temperature control mechanism 413 is used to control the temperature of the liquid in the water storage device 412 to control the temperature of the test fixture 1.

[0035] Furthermore, the first thermal cycle test device further includes an electric spray valve 414, an electric water inlet valve 415, a plunger pump 416, an oil tank 417, an electric exhaust valve 418, an electric drain valve 419, and a safety valve 420. The electric spray valve 414, the electric water inlet valve 415, the electric exhaust valve 418, the electric drain valve 419, and the safety valve 420 work together to control the amount of liquid in the first thermal cycle test device and the temperature to which the test fixture 1 is subjected. The plunger pump 416 is used to suck oil from the oil tank 417 and replenish the water storage device 412 with liquid.

[0036] Figure 5 This is a schematic diagram of the structure of a second thermal cycle testing device 42 according to an exemplary embodiment of the present application. Figure 5 The second thermal cycle test device 42 includes a water pressure pump 421, a leak detector 422, an upper heating plate 423 and a lower heating plate 424. The test fixture 1 is clamped between the upper heating plate 423 and the lower heating plate 424. The water outlet of the water pressure pump 421 is connected to the leak detection hole 14, and the leak detector 14 is connected to the exhaust hole of the upper flange 1.

[0037] Specifically, the second thermal cycle test device 42 includes a hydraulic pump 421, a leak detector 422, an upper heating plate 423 and a lower heating plate 424. The test fixture 1 is sandwiched between the upper heating plate 423 and the lower heating plate 424, the water outlet of the hydraulic pump 421 is connected to the leak detection hole 14 of the test fixture 1, and the leak detector 14 is connected to the exhaust hole of the upper flange 1 of the test fixture 1. The test fixture 1 is heated by the upper heating plate 423 and the lower heating plate 424 to control the temperature of the test fixture 1.

[0038] Furthermore, the second thermal cycle test device 42 also includes a pressure gauge 425, a gas cylinder pressure gauge 426, a pressure reducing valve 427, a helium cylinder 428, a temperature measuring hole 429, an exhaust valve 430, a sealing ring 431, and an induction heating furnace 432. Among them, the induction heating furnace 432 is used to heat the test fixture 1, and the temperature measuring hole 429 is used to detect the temperature of the test fixture. The pressure reducing valve 427 and the exhaust valve 430 are used to control the internal air pressure of the test fixture 1. The pressure gauge 425 and the gas cylinder pressure gauge 426 are used to detect the pressure of the test fixture 1.

[0039] Figure 6 This is a schematic diagram of the structure of a stress relaxation testing device 5 shown in an exemplary embodiment of the present application. Figure 6 , the stress relaxation testing device 5 comprises: The load sensor 51 is arranged between the lower clamping portion 62 and the hydraulic cylinder 63, and is arranged directly below the test fixture 1. It is used to detect the load change of the test fixture 1 after the test fixture 1 is subjected to the target compression load for a preset period of time, and calculate the stress relaxation rate of the sealing ring based on the load change.

[0040] For details, please refer to Figure 6 The stress relaxation test device 5 includes a load sensor 51. The load sensor 51 is disposed between the lower clamping portion 62 of the pressure structure 6 and the hydraulic cylinder 63, and is disposed directly below the test fixture 1.

[0041] Furthermore, the stress relaxation testing device 5 also includes a displacement sensor 52 , a test fixture 1 , a sealing ring 15 , a test control console 64 , a test machine table 65 , an upper clamping part 61 , a lower clamping part 62 , and a hydraulic cylinder 63 .

[0042] Furthermore, when the sealing ring is subjected to a stress relaxation test, the pressure structure 6 is used to determine the target compression load for compressing the sealing ring to a preset state according to the changing relationship between the cold and hot state loads and displacements obtained by the cold and hot state leakage performance testing device, provide the target compression load to the test fixture 1, and maintain it for a preset time.

[0043] The load sensor 51 is used to detect the load change of the test fixture 1 after the test fixture 1 is subjected to the target compressive load for a preset time period, and calculate the stress relaxation rate of the sealing ring based on the load change.

[0044] The displacement sensor 52 is used to detect the displacement change of the test fixture 1 after the test fixture 1 is subjected to the target compressive load for a preset period of time.

[0045] The sealing ring performance test system provided in this embodiment includes a test fixture composed of a matching upper flange and a lower flange. Among them, the lower flange is provided with a sealing groove and a leak detection hole connected to the sealing groove. The sealing groove is provided on the side of the lower flange facing the upper flange, and is used to install the sealing ring to be tested. One end of the leak detection hole is connected to the sealing groove, and the other end is used to detachably install different performance test devices. The different performance test devices include cold and hot state leakage performance test devices, water pressure performance test devices, thermal cycle test devices and stress relaxation test devices. Among them, the cold and hot state leakage performance test device is used to test the changing relationship between the cold and hot state loads and displacements of the test fixture; the water pressure performance test device is used to test the changing relationship between the leakage performance of the test fixture and the water pressure value; the thermal cycle test device is used to detect the changing relationship between the leakage state of the test fixture and the temperature; the stress relaxation test device is used to detect the load change of the test fixture after compression, and calculate the stress relaxation rate of the sealing ring. In the first aspect, a plurality of different test devices are designed for different performances of the sealing ring, and these multiple different test devices are integrated into a sealing ring performance test system. When determining the performance of the sealing ring to be tested, it is only necessary to open the test device corresponding to the performance in the sealing ring performance test system to implement the performance test of the sealing ring, which is convenient and quick. On the second aspect, when testing different performances of the sealing ring, different test devices are designed, which can optimize the performance test process and improve the accuracy of the performance test. Different performance test items can be independently designed or implemented, which improves the flexibility and adaptability of the performance test and improves the overall test efficiency. The present invention tests the performance of the sealing ring under various working scenarios of nuclear power plants, realizes the independent development of the performance test system, gets rid of the dependence on imports, and improves the stability and durability of the sealing ring performance under the working scenarios of repeated and large temperature changes in nuclear power plants.

[0046] Corresponding to the aforementioned embodiment of a sealing ring performance testing system, the present application also provides an embodiment of a sealing ring performance testing method.

[0047] Figure 7 This is a flow chart of Example 1 of the sealing ring performance testing method provided in this application. The method provided in this embodiment includes: S701. Perform hot and cold state leakage performance tests on the test fixture of the sealing ring, wherein the hot and cold state leakage performance tests at least include detecting the compression load and leakage rate of the test fixture at a first preset temperature and a second preset temperature, calculating the compression amount based on the detection results, and obtaining the changing relationship between the hot and cold state load and the displacement.

[0048] Specifically, hot and cold loads refer to the compressive loads of the test fixture at different temperatures. Hot and cold leakage performance tests are used to detect the compressive loads and displacements of the test fixture at different temperatures to determine the changing relationship between hot and cold loads and displacements.

[0049] In specific implementation, the cold and hot state leakage performance test includes: performing a compression test on the test tooling with step-by-step pressurization at a first preset temperature and a second preset temperature, respectively, to detect the leakage rate in real time; the first preset temperature is room temperature, and the second preset temperature is N times higher than the room temperature, where N is a positive integer greater than 1; calculating the compression amount of the sealing ring according to the compression load values ​​corresponding to multiple preset leakage rates; and obtaining the changing relationship between the cold and hot state load and the displacement based on the compression amount and the compression load value.

[0050] Specifically, the first preset temperature and the second preset temperature are set according to actual needs, and this embodiment is not limited to this. It should be noted that the first preset temperature is room temperature. For example, in one embodiment, the first preset temperature is 25°C. The second preset temperature is N times higher than the first preset temperature, and N is set according to actual needs. For example, the second preset temperature is 100°C. The preset leakage rate is set according to actual needs, and this embodiment is not limited to this.

[0051] In specific implementation, the temperature of the cold and hot state leakage performance test device is controlled at a first preset temperature. The initial pressure of the cold and hot state leakage performance test device is set, and a compression test is performed on the test fixture under the initial pressure. The compression load of the sealing ring in the compression test is measured based on the load sensor, and the leakage rate of the sealing ring in the compression test is detected based on the helium mass spectrometer leak detector. Among them, the initial pressure is set according to actual needs, and this is not limited in this embodiment. For example, in one embodiment, the initial pressure is 10KN. After the test is completed, the initial pressure is increased, and the compression test is repeated until the pressure of the cold and hot state leakage performance test device reaches the target pressure, and the test stops.

[0052] Similarly, the temperature of the hot and cold leakage performance testing device is controlled at a second preset temperature. The initial pressure of the hot and cold leakage performance testing device is set, and a compression test is performed on the test fixture under the initial pressure. The compression load of the sealing ring in the compression test is measured based on the load sensor, and the leakage rate of the sealing ring in the compression test is detected based on the helium mass spectrometer leak detector. Among them, the initial pressure is set according to actual needs, and this is not limited in this embodiment. For example, in one embodiment, the initial pressure is 10KN. After the test is completed, the initial pressure is increased, and the compression test is repeated until the pressure of the hot and cold leakage performance testing device reaches the target pressure and the test stops.

[0053] Furthermore, based on the leakage rate of each sealing ring, when the leakage rate is determined to be a preset leakage rate, the compression load of the corresponding sealing ring is used, and the displacement of the test fixture is detected based on the displacement sensor. Based on the compression amount and compression load under each pressure, a sealing characteristic curve is drawn using a graphical tool (such as Excel or Matplotlib) with the compression amount as the horizontal axis and the compression load as the vertical axis. The sealing characteristic curve represents the changing relationship between the cold and hot loads and the displacement. Figure 8 This is a schematic diagram of a sealing characteristic curve shown in an exemplary embodiment of the present application. Figure 8 , where e0 represents the compression of the sealing ring in the initial sealing state, in mm; e1 represents the compression of the sealing ring when unloading from the compression state to the sealing failure state, in mm; e1' represents the permanent compression of the sealing ring when unloading to the initial sealing state, in mm; e2 represents the optimal compression of the sealing ring when maintaining the sealing state (working point compression), in mm; ec represents the overload compression, in mm; Y0 represents the required compression load per unit length of the sealing ring in the initial sealing state, in N / mm; Y1 represents the compression load per unit length of the sealing ring when unloading from the compression state to the sealing failure state, in N / mm; Y2 represents the compression load per unit length of the sealing ring when maintaining the seal and corresponding to the compression state, in N / mm.

[0054] S702, performing a water pressure performance test on the test fixture to test the relationship between the leakage performance of the test fixture and the water pressure value.

[0055] Specifically, the water pressure performance test is used to detect the leakage performance of the test fixture under different water pressures.

[0056] In specific implementation, the water pressure performance test includes: injecting water into the test fixture and expelling air at the same time to make the test fixture full of water; increasing the pressure to multiple preset states in stages, and detecting the leakage state of the test fixture under the preset states; based on the water pressure in the preset states and the leakage state of the test fixture, obtaining the changing relationship between the leakage performance of the test fixture and the water pressure value.

[0057] Specifically, the plurality of preset states are distinguished based on the pressure of the test fixture, and each preset state corresponds to a different pressure.

[0058] In specific implementation, water is injected into the test fixture, and the exhaust valve is opened during water injection to drain the air in the device so that it is in a full water state. Furthermore, a compression test is performed on the sealing ring using a water pressure performance testing device under the initial pressure, and the pressure change of the sealing ring before and after compression is measured based on a pressure gauge to determine whether its pressure change is within the first preset difference. If the pressure change of the sealing ring is within the first preset difference, it is determined that the leakage performance of the sealing ring is poor. Furthermore, the initial pressure is increased, and the compression test process is repeated until the pressure value of the test fixture before the test reaches the target pressure value (the target pressure value is set according to actual needs, for example, in one embodiment, the target pressure value is 30MPa). Based on the water pressure value and leakage performance of the corresponding test fixture under each preset state, the changing relationship between the leakage performance and the water pressure value of the test fixture is determined.

[0059] It should be noted that, if the pressure change of the test fixture exceeds the first preset difference under any preset state, it is determined that the leakage performance of the sealing ring is good and the sealing ring needs to be adjusted.

[0060] S703, performing a thermal cycle test on the test tooling, increasing the temperature of the test tooling to the first preset temperature, and decreasing the temperature of the test tooling to the second preset temperature, and detecting the relationship between the leakage state of the test tooling and the temperature change.

[0061] Specifically, the thermal cycle test is used to detect the leakage performance of the test fixture at different temperatures.

[0062] In specific implementation, the thermal cycle test includes: filling the test tool with water, controlling the ambient temperature of the test tool to the first preset temperature at a heating rate greater than a preset threshold; increasing the water pressure in the test tool and maintaining the pressure for a first preset time; lowering the temperature of the test tool to the second preset temperature, returning to the heating step until the number of cycles reaches a preset threshold; during the cycle, detecting the leakage state of the test tool to obtain the relationship between the leakage state and the temperature change.

[0063] Specifically, the preset threshold is set according to actual needs, and this embodiment does not limit this. The first preset temperature and the second preset temperature are set according to actual needs, and this embodiment does not limit this. The first preset duration is set according to actual needs, and this embodiment does not limit this.

[0064] In specific implementation, water is injected into the test fixture, and the exhaust valve is opened to drain the air in the device during water injection, so that it is in a full water state. Further, water pressure is injected into the sealing ring using a thermal cycle test device at the initial temperature, and the pressure change of the sealing ring within the first preset time before and after compression is measured based on a pressure gauge to determine whether its pressure change is within the preset difference. If the pressure change of the sealing ring is within the preset difference, it is determined that the leakage performance of the sealing ring is poor. Further, the temperature is increased based on the temperature increase rate of the preset threshold, and the process of injecting water pressure is repeated until the temperature of the test fixture before the test reaches the first preset temperature. Further, the temperature of the test fixture before the test is lowered to the second preset temperature, and the process of injecting water pressure is repeated in a cycle. Based on the temperature and leakage state corresponding to each compression of the test fixture during the cycle, the relationship between the leakage state and the temperature change of the test fixture is determined.

[0065] S704, performing a stress relaxation test on the test fixture, wherein the stress relaxation test includes determining a compression load according to the cold and hot leakage performance tests, applying a compression load to the test fixture, detecting a load change of the test fixture after compression, and calculating a stress relaxation rate of the sealing ring.

[0066] Specifically, the stress relaxation test is used to detect the load change of the test fixture under different compression loads and determine the stress relaxation rate of the sealing ring.

[0067] In a specific implementation, the stress relaxation test includes: determining the maximum compression load of the sealing ring according to the cold and hot leakage performance tests, and determining the maximum compression load as the compression load applied to the test fixture; maintaining the compression load for a second preset time; releasing the compression load and detecting the residual load of the test fixture; and calculating the stress relaxation rate of the sealing ring based on the residual load and the compression load.

[0068] Specifically, combined with the above description, the maximum compression load of the sealing ring is determined based on the cold and hot leakage performance test, that is, the corresponding compression load when the sealing ring is in the target sealing state. Please continue to refer to Figure 2 The target sealing state refers to the sealing state of the sealing ring, that is, the maximum compression load of the sealing ring refers to Figure 2 Y2 in.

[0069] In a specific implementation, the stress relaxation test device is controlled to compress the test fixture under the maximum compression load of the sealing ring for a second preset time. During the compression process, the corresponding residual load is measured based on the load sensor. Based on the applied compression load and the residual load, the stress relaxation rate is calculated, that is, the difference between the compression load and the residual load is determined as the residual load difference; the quotient of the residual load difference and the compression load is determined as the stress relaxation rate. Furthermore, based on the magnitude relationship between the stress relaxation rate and the first preset threshold, the sealing effect of the sealing ring is determined. When the stress relaxation rate is less than the preset threshold, the sealing effect of the sealing ring is determined to be good; when the stress relaxation rate is greater than the preset threshold, the sealing effect of the sealing ring is determined to be poor.

[0070] The sealing ring performance test method provided in this embodiment designs different performance test methods for different performance of the sealing ring, wherein the test jig is subjected to cold and hot state leakage performance tests to obtain the changing relationship between cold and hot state loads and displacements; the test jig is subjected to water pressure performance tests to test the changing relationship between the leakage performance of the test jig and the water pressure value; the test jig is subjected to thermal cycle tests to detect the changing relationship between the leakage state of the test jig and the temperature; and the test jig is subjected to stress relaxation tests to calculate the stress relaxation rate of the sealing ring. On the one hand, when testing different performances of the sealing ring, different test methods are designed, which can optimize the performance test process and improve the accuracy of the performance test. Different performance test methods can be independently designed or implemented, which improves the flexibility and adaptability of the performance test and improves the overall test efficiency. Secondly, performance testing can verify the pressure resistance, temperature resistance and long-term reliability of the sealing ring, ensure that it can meet the design requirements in actual applications, avoid safety hazards caused by sealing failure, ensure the safe and stable operation of the system, ensure the sealing effect and reliability of the sealing ring under actual working conditions, ensure that the sealing ring can meet the stringent safety and performance requirements of nuclear power plants, reduce dependence on imported products, and enhance the independent guarantee capabilities of my country's nuclear power equipment.

[0071] The method of this embodiment can be used to execute the steps of the system embodiment. The specific implementation principles and processes are similar and will not be repeated here.

[0072] The implementation process of the functions and effects of each unit in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, and will not be repeated here.

[0073] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A sealing ring performance testing system, It is characterized in that The system comprises: a test fixture, comprising an upper flange and a lower flange that match each other, the lower flange being provided with a sealing groove and a leak detection hole connected to the sealing groove, the sealing groove being provided on a side of the lower flange facing the upper flange, and being used to install a sealing ring to be tested, one end of the leak detection hole being connected to the sealing groove, and the other end being used to detachably install different performance test devices, the different performance test devices comprising a cold and hot state leakage performance test device, a water pressure performance test device, a thermal cycle test device and a stress relaxation test device; Hot and cold leakage performance test device, used to test the changing relationship between hot and cold load and displacement of the test fixture; Water pressure performance testing device, used to test the relationship between the leakage performance of the test fixture and the water pressure value; A thermal cycle test device, used to increase the temperature of the test fixture to a first preset threshold value, and reduce the temperature of the test fixture to a second preset threshold value, so as to detect the relationship between the leakage state of the test fixture and the temperature change; The stress relaxation testing device is used to provide a compressive load to the test fixture according to the changing relationship between the cold and hot state loads and displacements obtained by the cold and hot state leakage performance testing device, detect the load change of the test fixture after compression, and calculate the stress relaxation rate of the sealing ring.

2. The system according to claim 1, It is characterized in that The test fixture also includes two sealing rings. The lower flange has two grooves on the side facing the upper flange. The two grooves are respectively arranged on both sides of the sealing groove. The two sealing rings correspond to the two grooves, and the sealing rings are squeezed between the upper flange and the lower flange.

3. The system according to claim 1, It is characterized in that The system further comprises a pressure-applying structure, the pressure-applying structure comprising an upper clamping part, a lower clamping part arranged opposite to the upper clamping part, and a hydraulic cylinder arranged at the bottom of the lower clamping part, the test fixture is clamped between the upper clamping part and the lower clamping part; the pressure-applying structure applies a plurality of preset amplitude loads to the test fixture during the cold and hot state leakage performance test to control the compression and rebound of the test fixture; The hydraulic cylinder is capable of applying pressure to the test fixture.

4. The system according to claim 3, It is characterized in that The cold and hot state leakage performance testing device comprises: a helium mass spectrometer leak detector connected to the leak detection hole, and used for detecting the leakage rate of the test fixture when the load on the test fixture reaches any one of the multiple preset amplitudes; A displacement sensor, one end of which is connected to the upper clamping part and the other end of which is connected to the lower clamping part, for detecting the displacement of the test fixture under different temperatures and compression loads, and calculating the changing relationship between the cold and hot loads and displacements; The cold and hot state leakage performance testing device is also used to determine the compression amount of the sealing ring when it is in the initial sealing state according to the changing relationship between the cold and hot state loads and displacements.

5. The system according to claim 3, It is characterized in that The upper flange includes an exhaust hole, and the exhaust hole is communicated with the sealing groove; The pressure-applying structure applies pressure to the test fixture during a water pressure performance test; The water pressure performance testing device comprises: A water pressure test pump is connected to the leak detection hole and is used to inject water into the sealing groove. The air in the sealing groove is discharged through the exhaust hole so that the sealing groove is filled with water. The pressure gauge is arranged between the leak detection hole and the water pressure test pump, and is used to detect the pressure of the test fixture during the water injection process, and determine the leakage performance based on the pressure change.

6. The system according to claim 1, It is characterized in that The thermal cycle test device comprises a first thermal cycle test device and / or a second thermal cycle test device; The first thermal cycle test device comprises a circulation pump, a water storage device and a temperature control mechanism disposed in the water storage device for controlling the temperature of the liquid in the water storage device, the water outlet of the water storage device is communicated with the water inlet of the circulation pump, the water outlet of the circulation pump is communicated with the leak detection hole, the water inlet of the water storage device is communicated with the drainage hole of the upper flange, and the drainage hole is communicated with the sealing groove; The second thermal cycle testing device includes a water pressure pump, a leak detector, an upper heating plate and a lower heating plate, the test fixture is arranged between the upper heating plate and the lower heating plate, the water outlet of the water pressure pump is connected to the leak detection hole, and the leak detector is connected to the exhaust hole of the upper flange.

7. The system according to claim 3, It is characterized in that During the stress relaxation test, the pressure structure determines the target compression load for compressing the sealing ring to a preset state according to the changing relationship between the cold and hot state loads and displacements obtained by the cold and hot state leakage performance testing device, provides the target compression load to the test fixture, and maintains it for a preset time; The stress relaxation testing device comprises: A load sensor is arranged between the lower clamping portion and the hydraulic cylinder and directly below the test fixture, and is used to detect the load change of the test fixture after the test fixture is subjected to the target compression load for a preset period of time, and calculate the stress relaxation rate of the sealing ring based on the load change.

8. A sealing ring performance testing method, It is characterized in that The method comprises: Performing a cold and hot state leakage performance test on the test fixture of the sealing ring, wherein the cold and hot state leakage performance test at least includes detecting the compression load and leakage rate of the test fixture at a first preset temperature and a second preset temperature, calculating the compression amount based on the detection result, and obtaining the change relationship between the cold and hot state load and displacement; Performing a water pressure performance test on the test fixture to test the relationship between the leakage performance of the test fixture and the water pressure value; Performing a thermal cycle test on the test tool, increasing the temperature of the test tool to the first preset temperature, and decreasing the temperature of the test tool to the second preset temperature, and detecting a relationship between a leakage state of the test tool and a temperature change; A stress relaxation test is performed on the test fixture, wherein the stress relaxation test includes determining a compression load according to the cold and hot leakage performance tests, applying a compression load to the test fixture, detecting a load change of the test fixture after compression, and calculating a stress relaxation rate of the sealing ring.

9. The method according to claim 8, It is characterized in that The cold and hot leakage performance test includes: The test fixture is subjected to a compression test with step-by-step pressurization at a first preset temperature and a second preset temperature, respectively, to detect the leakage rate in real time; the first preset temperature is room temperature, and the second preset temperature is N times higher than the room temperature, where N is a positive integer greater than 1; Calculating the compression amount of the sealing ring according to the compression load values ​​corresponding to the plurality of preset leakage rates; Based on the compression amount and the compression load value, the changing relationship between the cold and hot state loads and the displacement is obtained.

10. The method according to claim 8, It is characterized in that The thermal cycle test includes: Filling the test fixture with water, and controlling the ambient temperature of the test fixture to the second preset temperature at a heating rate greater than a preset threshold; Increasing the water pressure in the test fixture and maintaining the pressure for a first preset time; Lowering the temperature of the test fixture to room temperature, and returning to the temperature raising step until the number of cycles reaches a preset threshold; During the cycle, the leakage state of the test fixture is detected to obtain the relationship between the leakage state and the temperature change.

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