A sealing ring performance testing device and method

Abstract

The present application provides a sealing ring performance testing device and method, which belongs to the field of sealing technology. The device provided by the present application includes an upper pressure plate and a lower pressure plate arranged in opposition; a plurality of test fixtures; a displacement sensor; the sealing ring performance testing device is used to collect the deformation amount of sealing rings with different cross-sectional diameters under preset compression conditions and the change of load; the sealing ring performance testing device is connected to a water pressure testing device to collect the corresponding relationship between the cross-sectional diameter and the leakage pressure of the sealing ring under a preset compression load; the sealing ring performance testing device is connected to a compression rebound testing device to collect the sealing load of the sealing ring with different cross-sectional diameters under compression and unloading conditions under preset compression conditions. The sealing load changes with the compression amount and the sealing load changes with the leakage rate. The sealing ring performance testing device and method provided by the present application are used to test the performance of the sealing ring and ensure the sealing effect and reliability of the sealing ring in high-temperature and high-pressure helium media.

Description

Technical Field

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

[0002] The primary pressure vessel of the metal sealing ring for high temperature and high pressure helium medium consists of the reactor pressure vessel, the steam generator shell, and the hot gas duct shell. These three pressure vessels have a total of 6 pairs of large-sized connecting flanges (called main flanges). In the high temperature and high pressure helium medium metal sealing ring demonstration project (HTR-PM), these 6 pairs of flanges are sealed with double-pass metal O-rings, and their cross-sectional specifications are , with a silver-plated surface. In the subsequent 600MW high-temperature and high-pressure helium medium metal sealing ring project (HTR-PM600), for the sake of localization and other considerations, it is planned to replace all the metal O-rings used in HTR-PM with C-rings. However, the prerequisite for this replacement plan is that it will not affect the design of the main flange, including the cross-sectional dimensions of the flange, the specifications and quantity of the fasteners, etc. Therefore, it is necessary to test the performance of the C-ring to verify whether this C-ring can be successfully used in the environment of high-temperature and high-pressure helium medium without modifying the existing flange design. Summary of the invention

[0003] In view of this, the present application provides a sealing ring performance testing device and method to test the sealing ring performance and ensure the sealing effect and reliability of the sealing ring in a high-temperature and high-pressure helium medium.

[0004] Specifically, the present application is implemented through the following technical solutions:

[0005] A first aspect of the present application provides a sealing ring performance testing device, the device comprising an upper pressing plate and a lower pressing plate arranged opposite to each other;

[0006] A plurality of test fixtures are respectively and sequentially installed on the opposite surfaces of the upper pressing plate and the lower pressing plate to contact each other, the upper pressing plate and the lower pressing plate cooperate with each other, and the test fixture is compressed during the sealing ring performance test, the test fixture comprises an upper flange, a limit ring and a lower flange, the limit ring is arranged between the upper flange and the lower flange, the upper flange and the lower flange cooperate with each other, the limit ring thickness of each test fixture is different, and the thickness of each limit ring matches the cross-sectional diameter of the sealing ring to be tested;

[0007] A displacement sensor connected to the controller of the performance testing device to detect the distance between the upper pressing plate and the lower pressing plate;

[0008] The lower flange of the test fixture is also provided with a leak detection hole, one end of which is connected to the sealing ring to be tested, and the other end is provided on the side of the lower flange, and can be detachably connected to a water pressure test device and a compression rebound test device;

[0009] The sealing ring performance testing device is used to collect the deformation variation of the sealing rings with different cross-sectional diameters under preset compression conditions as a function of load; the sealing ring performance testing device is connected to the water pressure testing device to collect the corresponding relationship between the cross-sectional diameter and the leakage pressure of the sealing ring under a preset compression load; the sealing ring performance testing device is connected to the compression rebound testing device to collect the sealing load variation of the sealing rings with different cross-sectional diameters under compression and unloading conditions as a function of compression and the sealing load variation with leakage rate.

[0010] A second aspect of the present application provides a sealing ring performance testing method, the method comprising:

[0011] The air-tightness performance test fixture of the sealing ring is fixed based on the sealing ring performance test device, and the deformation variation of the sealing rings with different cross-sectional diameters during the compression and the rebound process with the load is detected to perform a line sealing load test. When the sealing ring is at a first thickness, adjacent springs are in contact without gaps;

[0012] The tooling that has undergone the load test is used as a water pressure test tooling, and based on the space in which the water pressure test device applies multiple levels of water pressure to the sealing ring, the corresponding relationship between the cross-sectional diameter and the leakage pressure under the preset compression load is determined to perform a water pressure test;

[0013] Based on the compression-rebound test device, the compression-rebound leakage rate test fixture of the sealing ring is fixed to detect the leakage of the sealing rings with different cross-sectional diameters during the compression and rebound processes, and the change of the sealing load of the sealing ring with the compression amount and the change of the sealing load with the leakage rate are determined to perform a compression-rebound leakage rate test.

[0014] The sealing ring performance testing device and method provided in this application realizes a comprehensive, accurate and efficient evaluation of the sealing ring performance through precise design and multifunctional combined testing methods. This device is not only suitable for research and development and quality control, but also can greatly improve the efficiency and accuracy of the test, reduce the risk of misjudgment caused by test limitations, and has important practical value for the development, selection and application of seals. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A structural diagram of the sealing ring performance testing device provided in this application;

[0016] Figure 2A partial schematic diagram of the compression-rebound test device provided in this application;

[0017] Figure 3 A structural diagram of the compression-rebound test device provided for this application;

[0018] Figure 4 A structural diagram of a sealing ring performance test device provided in this application for conducting a water pressure test;

[0019] Figure 5 A flow chart of the sealing ring performance testing method provided in this application;

[0020] Figure 6 A load-deformation curve diagram showing an exemplary embodiment of the present application;

[0021] in,

[0022] 1: Upper pressing plate;

[0023] 2: Lower pressure plate;

[0024] 3: Test fixture; 31: Upper flange; 32: Limiting ring; 33: Lower flange; 34: Leak detection hole;

[0025] 4: Sealing ring;

[0026] 5: Displacement sensor;

[0027] 6: Controller;

[0028] 7: Water pressure test device;

[0029] 8: Compression rebound test device;

[0030] 9: first inflatable outer cover;

[0031] 10: second inflatable outer cover;

[0032] 11: First exit;

[0033] 12: second valve; 1201: first port of the second valve; 1202: second port of the second valve;

[0034] 13: third valve; 1301: first port of the third valve; 1302: second port of the third valve;

[0035] 14: Helium tank;

[0036] 15: Vacuum pump;

[0037] 16: Second exit;

[0038] 17: First valve;

[0039] 18: Helium mass spectrometer leak detector;

[0040] 19: Leak detection hole;

[0041] 20: The fourth valve;

[0042] 21: sealing ring;

[0043] 22: Water pressure test pump;

[0044] 23: Exhaust valve;

[0045] 24: rubber ring;

[0046] 25: load sensor;

[0047] 26: Hydraulic cylinder. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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".

[0051] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0052] Figure 1 For the structural diagram of the sealing ring performance test device provided in this application, please refer to Figure 1 , the device provided in this embodiment includes an upper pressing plate 1 and a lower pressing plate 2 which are arranged opposite to each other;

[0053] A plurality of test fixtures 3 are respectively and sequentially installed on the opposite surfaces of the upper pressing plate 1 and the lower pressing plate 2 to contact each other. The upper pressing plate 1 and the lower pressing plate 2 cooperate with each other to compress the test fixture 3 during the sealing ring performance test. The test fixture 3 includes an upper flange 31, a limit ring 32 and a lower flange 33. The limit ring 32 is arranged between the upper flange 31 and the lower flange 33. The upper flange 31 and the lower flange 33 cooperate with each other. The limit ring 32 of each test fixture 3 has a different thickness, and the thickness of each limit ring 32 matches the cross-sectional diameter of the sealing ring 4 to be tested;

[0054] A displacement sensor 5 connected to a controller 6 of the performance testing device to detect the distance between the upper pressing plate 1 and the lower pressing plate 2;

[0055] The lower flange 31 of the test fixture 3 is also provided with a leak detection hole 34, one end of the leak detection hole 34 is connected to the sealing ring 4 to be tested, and the other end is provided on the side of the lower flange 33, and can be detachably connected to the water pressure test device 7 and the compression rebound test device 8;

[0056] The sealing ring performance testing device is used to collect the deformation variation of the sealing rings with different cross-sectional diameters under preset compression conditions as the load changes; the sealing ring performance testing device is connected to the water pressure testing device 7 to collect the corresponding relationship between the cross-sectional diameter and the leakage pressure of the sealing ring 4 under a preset compression load; the sealing ring performance testing device is connected to the compression rebound testing device 8 to collect the sealing load of the sealing ring 4 with different cross-sectional diameters under preset compression conditions, in the compression and unloading states, as well as the sealing load variation with the leakage rate.

[0057] It should be noted that the upper pressing plate 1 and the lower pressing plate 2 are arranged relative to each other and adjusted by mechanical means, and are used to compress the test fixture 3 and the sealing ring 4 therein during the test.

[0058] It should be noted that the thickness of each limiting ring 32 is different and is designed to match the cross-sectional diameter of the sealing ring to be tested, so as to facilitate simulation of compression conditions under different conditions.

[0059] Please continue to refer to Figure 1 The displacement sensor 5 is connected to the controller 6 of the performance test device to detect the distance between the upper platen 1 and the lower platen 2 in real time to monitor and control the compression amount. One end of the leak detection hole 34 is connected to the sealing ring 4 to be tested, and the other end is located on the side of the lower flange 33 and can be connected to the water pressure test device 7 or the compression rebound test device 8 to detect the sealing performance of the sealing ring 4.

[0060] Please continue to refer to Figure 1The sealing ring performance testing device is used to collect the deformation variation of the sealing rings with different cross-sectional diameters under preset compression conditions as a function of load, including:

[0061] Install any one of the multiple test fixtures 3 to the upper top surface of the lower pressing plate 2, the upper top surface is a surface arranged opposite to the upper pressing plate 1, the controller 6 controls the upper pressing plate 1 and the lower pressing plate 2 arranged opposite to each other to move relative to each other until the sealing ring 4 is compressed to the same thickness as the limit ring 32, and the controller 6 controls the upper pressing plate 1 and the lower pressing plate 2 to move in opposite directions;

[0062] The displacement sensor 5 detects the displacement change between the upper pressure plate 1 and the lower pressure plate 2, calculates the sealing ring shape variable according to the displacement change, calculates the linear sealing load of the sealing ring 4 according to the compression load provided by the controller 6, and obtains the change of the deformation of the sealing ring 4 with different cross-sectional diameters as the linear sealing load changes.

[0063] It should be noted that the load refers to the force or external force applied to an object, including the magnitude, direction and distribution of the force. Specifically, the controller 6 controls the upper pressure plate 1 and the lower pressure plate 2 to move in opposite directions, that is, the upper pressure plate 1 moves upward and the lower pressure plate 2 moves downward, gradually reducing the compression force on the sealing ring 4. Among them, the sealing ring 4 is compressed to the same thickness as the limit ring 32. In this process, the limit ring 32 plays a role of physical limitation to ensure compression to the preset thickness. It should also be noted that the deformation of sealing rings with different cross-sectional diameters under preset compression conditions varies with the change of linear sealing load. Specifically, the specific calculation method of the deformation variation with the linear sealing load will be introduced in detail below and will not be repeated here.

[0064] Figure 2 A partial schematic diagram of the compression rebound test device provided in this application, Figure 3 This is the structural diagram of the compression rebound test device provided for this application. Please also refer to Figure 2 and Figure 3 The compression rebound test device includes a first inflatable outer cover 9 and a second inflatable outer cover 10. The first and second inflatable outer covers are respectively arranged on the left and right sides of the test fixture. The first and second inflatable outer covers respectively cover the connection between the upper flange 31, the lower flange 33 and the limit ring 32 on the left and right sides of the test fixture 3. The first and second inflatable outer covers are sealed and connected to the test fixture through a rubber ring 24.

[0065] The first inflatable outer cover 9 has a first outlet 11 away from the surface in contact with the test fixture 3, and the first outlet 11 is connected to the first port 1201 of the second valve 12 and the first port 1301 of the third valve 13 through three-way valves respectively; the second port 1202 of the second valve 12 is connected to the helium bottle 14 for inputting helium into the vacuum environment of the test fixture 3; the second port 1302 of the third valve 13 is connected to the vacuum pump 15 for extracting the air in the test fixture 3;

[0066] The second inflatable cover 10 has a second outlet 16 on a surface away from the contact with the test tool 3, and the second outlet 16 is connected to the air through a first valve 17. Figure 3 It should also be noted that the compression-rebound test device also includes a load sensor 25 and a hydraulic cylinder 26 .

[0067] It should be noted that, considering that during the compression rebound test, the outside of the compression rebound test device 8 will be in an open state, when helium is sprayed on the outside of the test fixture 3, the helium mixes with the air and the concentration decreases. The helium with reduced concentration may affect the accuracy of the test. Therefore, an inflatable cover is installed on the outside of the compression rebound test device 8, wherein the inflatable cover is mainly composed of an aluminum cover, a valve, a rubber O-ring and other components. The sealing ring performance test device is mainly used to test the compression rebound performance of the sealing ring under different air pressure conditions. By changing the gas type and pressure in the test fixture, the actual working environment can be simulated to evaluate the performance of the sealing ring. It should also be noted that the three-way valve is a valve with three ports, which is used to control the flow direction of the fluid between different pipelines.

[0068] Please continue to refer to Figure 2 and Figure 3 The compression rebound test device 8 also includes a helium mass spectrometer leak detector 18, which is connected to the test fixture 3 through a leak detection hole 19. The compression rebound test device 8 includes a test state; in the test state, the upper pressure plate 1 and the lower pressure plate 2 perform relative movement and reverse movement, the fourth valve 20 and the second valve 12 are closed, the third valve 13 is opened, and the vacuum pump 15 extracts the air in the test fixture 3; the third valve 13 is closed, and the second valve 12 is opened to provide a helium environment with a concentration higher than a preset value; the helium mass spectrometer leak detector detects helium leakage.

[0069] It should be noted that the leak detection hole 19 is a hole provided on the lower flange of the test fixture and connected to the sealing ring to be tested at one end, and is specifically used to detect whether helium inside the test fixture leaks under the test state, so as to evaluate the sealing performance of the sealing ring.

[0070] It should also be noted that, under the test state, the upper pressure plate 1 and the lower pressure plate 2 move relative to each other to compress the sealing ring 21. Then, the upper pressure plate 1 and the lower pressure plate 2 move in the opposite direction to gradually unload the compressive force, simulating the state change of the sealing ring 21 under different loads. Specifically, at the beginning of the test, the fourth valve 20 and the second valve 12 are closed to ensure that helium and other external gases do not enter the test fixture 3, and then by opening the third valve 13, the vacuum pump 15 begins to extract the air in the test fixture 3 to form a near-vacuum environment, and after the vacuum environment is formed, the third valve 13 is closed, and the second valve 12 is opened to allow the helium in the helium bottle 14 to enter the test fixture 3 to provide a high-concentration helium environment. Among them, the concentration of helium is higher than the preset value, in order to improve the sensitivity and accuracy of the detection. In addition, helium molecules are very small and highly permeable, making them very suitable for detecting tiny leaks. The helium mass spectrometer leak detector 18 starts working in a high-concentration helium environment. It detects whether there is helium leakage in the test fixture 3, and evaluates the sealing performance of the sealing ring by detecting the helium leakage rate. For the specific working principle of the helium mass spectrometer leak detector, please refer to the description of the relevant technology, which will not be repeated here.

[0071] Figure 4 For the structural diagram of the sealing ring performance test device provided in this application for water pressure test, please refer to Figure 4 The water pressure test device includes: a water pressure test pump 22, which is connected to the test fixture 3 through the leak detection hole 19, and fills water into the test fixture 3 after the upper pressure plate 1 and the lower pressure plate 2 provide the preset compression load to the test fixture; an exhaust valve 23, which is arranged on the upper flange 31 and cooperates with the water pressure test pump 22 to exhaust the air in the test fixture 3 when the water pressure test pump 22 fills the test fixture 3 with water.

[0072] The water pressure test device can accurately simulate the working state of the sealing ring under water pressure conditions by precisely controlling the water pressure and air exhaust process. Through such tests, the sealing performance of the sealing ring in a high-pressure water environment can be effectively evaluated.

[0073] The sealing ring performance test device provided in this embodiment realizes a comprehensive, accurate and efficient evaluation of the sealing ring performance through precise design and multifunctional combined test methods. This device is not only suitable for research and development and quality control, but also can greatly improve the efficiency and accuracy of the test, reduce the risk of misjudgment caused by test limitations, and has important practical value for the development, selection and application of seals.

[0074] Figure 5 This is a flow chart of the sealing ring performance testing method provided in this application. Please refer to Figure 5 , the method comprising:

[0075] S501. Fix the air-tight performance test fixture of the sealing ring based on the sealing ring performance test device to detect the change of deformation of the sealing rings with different cross-sectional diameters during the compression and rebound processes with the load, so as to perform a line sealing load test. When the sealing ring is at the first thickness, adjacent springs are in contact without gap.

[0076] It should be noted that the process of conducting the test based on the sealing ring performance test device includes: after fixing the airtight performance test fixture of the sealing ring based on the sealing ring performance test device, using the rated load (for example, the rated load is 600KN) to control the helium pressure unit to pressurize the airtight performance test fixture of the sealing ring to achieve compression of the sealing ring, and when the sealing ring is compressed to the first thickness, the adjacent springs are in contact without gaps, that is, the height after compression is the design depth of the sealing groove of the sealing ring, and metal-to-metal contact is achieved, which can ensure that the sealing ring does not deform excessively under the maximum allowable compression. At this time, it starts to rebound slowly, and the changes in the sealing ring variables with the load during the entire compression and rebound process are recorded.

[0077] Specifically, detecting the change of deformation amount of the sealing ring with different cross-sectional diameters with load during the compression and the rebound process includes:

[0078] (1) Controlling the compression and rebound of the sealing ring based on the sealing ring performance testing device.

[0079] It should be noted that the sealing ring performance testing device can accurately apply and adjust the force acting on the sealing ring so that the sealing ring is compressed according to preset conditions, and after the compression load is released, the sealing ring performance testing device can accurately monitor and control the rebound process of the sealing ring.

[0080] (2) Detect the deformation and compression load during compression and rebound.

[0081] It should be noted that during the compression and rebound process, the displacement sensor is used to monitor the thickness change or displacement of the sealing ring in real time, so as to accurately measure the deformation of the sealing ring under different loads. The load sensor can be used to measure the force applied to the sealing ring during the compression and rebound process in real time. The load sensor is usually installed on the device that applies the compressive force, so that the force acting on the sealing ring can be directly measured.

[0082] (3) Calculate the line seal load based on the ratio of the circumference of the compressed seal ring to the compression load.

[0083] Specifically, the process may include: obtaining compression load data when the sealing ring is compressed to a first thickness; measuring the circumference of the center diameter of the sealing ring to obtain the circumference data of the center diameter of the sealing ring; and calculating the line sealing load based on the ratio of the circumference of the compressed sealing ring to the compression load.

[0084] Specifically, it can be expressed by the following formula:

[0085] Y=F / C;

[0086] Where, Y is the line seal load, in N / mm; F ​​is the load when compressed to metal-to-metal contact, in N; C is the circumference of the seal ring center diameter, in mm.

[0087] (4) Determine whether the line seal load test is passed based on the value of the line seal load during the compression and rebound process of the sealing ring.

[0088] It should be noted that one or more critical values ​​of the line sealing load can be set according to design requirements or industry standards. Specifically, these standard values ​​usually depend on the working pressure, temperature and use environment of the sealing ring in actual applications. Optionally, a minimum standard and a maximum standard can be set, wherein the minimum standard is used to determine the minimum line sealing load value that the sealing ring must reach during compression and rebound to ensure sealing performance; the maximum standard is used to avoid damage or failure of the sealing ring due to excessive compression. At this time, if the line sealing load value measured by the sealing ring during compression and rebound is always within the set qualified range (that is, between the minimum standard and the maximum standard), the sealing ring is judged to have passed the line sealing load test, otherwise it is unqualified.

[0089] S502, using the tooling that has undergone the load test as a water pressure test tooling, based on the space in which the water pressure test device applies multiple levels of water pressure to the sealing ring, determine the corresponding relationship between the cross-sectional diameter and the leakage pressure under a preset compression load to perform a water pressure test.

[0090] It should be noted that using the tooling that has undergone the load test as a hydraulic test tooling means that the hydraulic test is performed on the sealing ring after the sealing load test. The process of the hydraulic test is as follows: apply pressure to the hydraulic test tooling through the hydraulic pressure unit, and connect the water inlet of the hydraulic test tooling to the hydraulic test pump; use the hydraulic test pump to inject water into the hydraulic test tooling, and at the same time open the exhaust valve at the upper flange; after the hydraulic test tooling is filled with water, close the exhaust valve to increase and maintain pressure; after the test, reduce pressure and drain water, remove the load of the test machine, and check the state of the sealing ring after pressure.

[0091] Specifically, based on the space formed by the water pressure test device to apply multiple levels of water pressure to the sealing ring, the corresponding relationship between the cross-sectional diameter and the leakage pressure under the preset compression load is determined, including: detecting the first load when the sealing ring is compressed to the thickness of the limit ring; determining the adjustment load based on the product of the size of the sealing ring and the medium pressure of the water pressure test fixture; adding the first load and the adjustment load, and calculating the preset compression load according to the product of the sum and the safety factor. It should be noted that the first load can be measured by a load sensor, and then the size of the sealing ring is determined based on the middle diameter of the sealing ring, and multiplied by the obtained medium pressure of the water pressure test fixture to obtain the adjustment load (the additional load that needs to be applied under actual working conditions). For example, in one embodiment, the adjustment load is 1.1, and the preset compression load is finally calculated.

[0092] Specifically, it can be expressed by the following formula:

[0093] F=(π·R1 2 ×P+F 1 )×1.1;

[0094] Where F is the preset compression load; R1 is the median diameter of the sealing ring, in mm; P is the medium pressure of the water pressure test fixture, in MPa; F 1 The first load, in N.

[0095] It should also be noted that, based on the space formed by the water pressure test device to apply multiple levels of water pressure to the sealing ring, the corresponding relationship between the cross-sectional diameter and the leakage pressure under the preset compression load is determined, including:

[0096] (1) The water pressure test device at least includes a water pressure test pump, a first level of water pressure space is formed based on the water pressure test pump, and the water pressure test tool is arranged in the water pressure space.

[0097] It should be noted that the hydraulic test device includes at least one hydraulic test pump, through which a closed space to which multiple levels of water pressure can be applied is formed inside the test fixture, and the sealing ring is placed in this space and tested under different water pressures. At the beginning of the test, the hydraulic test pump adjusts the water pressure in the space to the first predetermined water pressure level.

[0098] (2) After maintaining the pressure for a first preset time, detecting leakage of the sealing ring.

[0099] It should be noted that after reaching the first preset water pressure level, the water pressure is maintained for a certain period of time (called the first preset time). During this period of time, the water pressure is stable and no further pressurization is performed, the purpose of which is to observe the sealing performance of the sealing ring under stable pressure.

[0100] After the pressure holding stage, check whether the sealing ring is leaking. Leak detection is usually done by detecting whether there is water seepage outside the sealing ring or monitoring pressure changes through internal sensors.

[0101] (3) If the sealing ring leaks, the corresponding relationship between the cross-sectional diameter and the leakage pressure under a preset compression load is determined according to the diameter of the sealing ring.

[0102] It should be noted that if leakage of the sealing ring is found during the pressure holding stage, the corresponding relationship between the cross-sectional diameter of the sealing ring and the leakage pressure under this preset compression load is determined based on the previously measured sealing ring diameter and the current water pressure level.

[0103] (4) If the sealing ring does not leak, the pressure level of the water pressure space is increased at intervals of a first preset pressurization step, and the process returns to the pressure maintaining step.

[0104] If the sealing ring does not leak at the current water pressure level, the water pressure is further increased. During pressurization, the pressure is increased to the next level at intervals of a predetermined pressurization step length (ie, the water pressure value increased each time is fixed).

[0105] At the new water pressure level, the pressure is maintained and leak detection is performed again. This process is repeated until a leak is found or the set maximum water pressure level is reached.

[0106] Such a testing process can effectively evaluate the sealing performance of the sealing ring under various pressure conditions, especially by detecting leakage to determine its limit performance and ensure the reliability of the sealing ring in actual use.

[0107] S503. Fix the compression-rebound leakage rate test fixture of the sealing ring based on the compression-rebound test device, detect the leakage of the sealing rings with different cross-sectional diameters during the compression and rebound processes, determine the change of the sealing load of the sealing ring with the compression amount and the change of the sealing load with the leakage rate, so as to perform a compression-rebound leakage rate test.

[0108] It should be noted that the process of the compression rebound test is as follows: based on the compression rebound test device, the compression rebound leakage rate test fixture of the sealing ring is fixed; the air inlet of the compression rebound leakage rate test fixture is connected to the helium mass spectrometer leak detector; the sealing ring is compressed with a rated load, and the sealing cavity of the compression rebound leakage rate test fixture is evacuated to a vacuum state using the helium mass spectrometer leak detector during compression; based on the helium mass spectrometer leak detector, the load point where the leakage rate is a preset threshold during the compression and evacuation of the gas is recorded, and a load-deformation curve is drawn.

[0109] Specifically, the compression-rebound test device at least includes a helium mass spectrometer leak detector, which detects the leakage of the sealing rings with different cross-sectional diameters during the compression and rebound processes, and determines the change of the sealing load of the sealing ring with the compression amount and the change of the sealing load with the leakage rate, including:

[0110] (1) Controlling the compression and rebound of the sealing ring based on the load test device.

[0111] For details, please refer to the above description and will not be repeated here.

[0112] (2) The interior of the compression rebound test fixture is evacuated to a vacuum state based on the helium mass spectrometer leak detector, and helium is sprayed outside the compression rebound test fixture.

[0113] It should be noted that a helium mass spectrometer leak detector is used to evacuate the interior of the compression rebound test fixture into a vacuum state, and helium is sprayed outside the test fixture. In this way, if there is any leakage in the sealing ring, the helium will enter the vacuum fixture through the leakage point and be detected by the helium mass spectrometer.

[0114] (3) Detecting the deformation and compression load during compression and rebound, and the leakage rate of the compression rebound test fixture.

[0115] It should be noted that a displacement sensor can be used to monitor the deformation during compression and rebound, a load sensor can be used to detect the compression load of the process, and a helium mass spectrometer leak detector can be used to measure the leakage rate of the sealing ring under different compression states.

[0116] (4) Calculating the linear sealing load according to the ratio of the circumference of the compressed sealing ring to the compression load, and determining how the sealing load of the sealing ring changes with the compression amount.

[0117] Specifically, the line sealing load can be calculated by dividing the circumference of the sealing ring by the applied compression load (see the above description). Then, a load-deformation curve can be drawn according to the change of the sealing load of the sealing ring with the compression amount.

[0118] Figure 6 For a load-deformation curve diagram of an exemplary embodiment of the present application, please refer to Figure 6, where Y0 is the sealing load of the sealing ring when it reaches the initial sealing state, N / mm; Y1 is the sealing load of the sealing ring when it is unloaded from the compression state e2 until the seal fails, N / mm; Y2 is the sealing load of the sealing ring when the seal is maintained and corresponds to the compression state e2, N / mm; e0 is the compression amount of the sealing ring corresponding to the initial sealing state, mm; e1 is the compression amount of the sealing ring corresponding to the unloading from the compression state e2 until the seal fails, mm; e'1 is the permanent deformation of the sealing ring when the load drops to zero, mm; e2 is the optimal compression amount of the sealing ring corresponding to the sealing state to maintain the sealing state, mm.

[0119] (5) Determine the change of the sealing load with the leakage rate according to the load value corresponding to the leakage rate of the compression rebound test tooling when the leakage rate reaches a preset threshold.

[0120] It should be noted that during the test, when the leakage rate reaches a preset threshold, the corresponding compression load is recorded. This value reflects the maximum load that the sealing ring can withstand when it reaches the limit leakage state. By comparing the changes in the sealing load and the leakage rate, the leakage performance of the sealing ring under different load levels can be determined.

[0121] The sealing ring performance testing method provided in this embodiment can comprehensively and accurately evaluate the performance of the sealing ring and ensure its safety and reliability under various complex working conditions.

[0122] Optionally, the test method provided in the present application may also include transient tests, air pressure tests, repeated compression rebound, and leakage rate tests. The specific implementation principles are similar to the above contents and will not be repeated here.

[0123] 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.

[0124] 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.

[0125] 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 device, characterized in that: include: An upper pressing plate and a lower pressing plate arranged opposite to each other; A plurality of test fixtures are respectively and sequentially installed on the opposite surfaces of the upper pressing plate and the lower pressing plate to contact each other, the upper pressing plate and the lower pressing plate cooperate with each other, and the test fixture is compressed during the sealing ring performance test, the test fixture comprises an upper flange, a limit ring and a lower flange, the limit ring is arranged between the upper flange and the lower flange, the upper flange and the lower flange cooperate with each other, the limit ring thickness of each test fixture is different, and the thickness of each limit ring matches the cross-sectional diameter of the sealing ring to be tested; A displacement sensor connected to the controller of the performance testing device to detect the distance between the upper pressing plate and the lower pressing plate; The lower flange of the test fixture is also provided with a leak detection hole, one end of which is connected to the sealing ring to be tested, and the other end is provided on the side of the lower flange, and can be detachably connected to a water pressure test device and a compression rebound test device; The sealing ring performance testing device is used to collect the deformation variation of the sealing rings with different cross-sectional diameters under preset compression conditions as a function of load; the sealing ring performance testing device is connected to the water pressure testing device to collect the corresponding relationship between the cross-sectional diameter and the leakage pressure of the sealing ring under the preset compression load; The sealing ring performance testing device is connected to the compression rebound testing device to collect the changes of the sealing load of the sealing ring with the compression amount and the changes of the sealing load with the leakage rate under the preset compression conditions and under the compression and unloading states of the sealing rings with different cross-sectional diameters; The sealing ring performance testing device is used to collect the deformation variation of the sealing rings with different cross-sectional diameters under preset compression conditions as a function of load, including: Install any one of the multiple test fixtures to the top surface of the lower pressing plate, the top surface is a surface arranged opposite to the upper pressing plate, the controller controls the upper pressing plate and the lower pressing plate arranged opposite to each other to move relative to each other until the sealing ring is compressed to the same thickness as the limiting ring, and the controller controls the upper pressing plate and the lower pressing plate to move in opposite directions; The displacement sensor detects the displacement change between the upper pressing plate and the lower pressing plate, calculates the deformation of the sealing ring according to the displacement change, calculates the linear sealing load of the sealing ring according to the compression load provided by the controller, and obtains the deformation of the sealing ring with different cross-sectional diameters as the linear sealing load changes; The compression rebound test device comprises a first and a second inflatable outer cover, which are respectively arranged on the left and right sides of the test fixture, and the first and the second inflatable outer cover respectively cover the upper flange, the lower flange and the connection between the limit ring on the left and right sides of the test fixture, and the first and the second inflatable outer cover are sealed and connected to the test fixture through a rubber ring; The first inflatable outer cover has a first outlet away from the surface in contact with the test tooling, the first outlet is connected to the first ports of the second valve and the third valve respectively through a three-way valve, the second port of the second valve is connected to a helium bottle for inputting helium into the vacuum environment in the test tooling; the second port of the third valve is connected to a vacuum pump for extracting air from the test tooling; The second inflatable housing has a second outlet away from the surface contacting the test fixture, and the second outlet is connected to air through a first valve.

2. The device according to claim 1, characterized in that The compression rebound test device also includes a helium mass spectrometer leak detector, which is connected to the test tooling through a leak detection hole. The compression-rebound test device includes a test state; In the test state, the upper pressing plate and the lower pressing plate perform relative motion and reverse motion, the fourth valve and the second valve are closed, the third valve is opened, and the vacuum pump extracts the air in the test fixture; The third valve is closed and the second valve is opened to provide a helium environment with a concentration higher than a preset value; The helium mass spectrometer leak detector detects helium leaks.

3. The device according to claim 1, characterized in that The water pressure test device comprises: A water pressure test pump is connected to the test fixture through a leak detection hole, and fills the test fixture with water after the upper pressure plate and the lower pressure plate provide a preset compression load to the test fixture; The exhaust valve is arranged on the upper flange and cooperates with the water pressure test pump to exhaust the air in the test tooling when the water pressure test pump fills the test tooling with water.

4. A sealing ring performance testing method, applied to the device as described in any one of claims 1 to 3, characterized in that: The method comprises: The air-tightness performance test fixture of the sealing ring is fixed based on the sealing ring performance test device, and the deformation variation of the sealing rings with different cross-sectional diameters during the compression and rebound process with the load is detected to perform a line sealing load test. When the sealing ring is at a first thickness, adjacent springs are in contact without gaps; The tooling that has undergone the load test is used as a water pressure test tooling, and based on the space in which the water pressure test device applies multiple levels of water pressure to the sealing ring, the corresponding relationship between the cross-sectional diameter and the leakage pressure under the preset compression load is determined to perform a water pressure test; Based on the compression-rebound test device, the compression-rebound leakage rate test fixture of the sealing ring is fixed to detect the leakage of the sealing rings with different cross-sectional diameters during the compression and rebound processes, and the change of the sealing load of the sealing ring with the compression amount and the change of the sealing load with the leakage rate are determined to perform a compression-rebound leakage rate test.

5. The method according to claim 4, characterized in that The detecting of the change of deformation amount of the sealing ring with different cross-sectional diameters with load during the compression and the rebound process includes: Controlling the compression and rebound of the sealing ring based on the sealing ring performance testing device; Detect deformation and compression load during compression and rebound; Calculating a line seal load according to a ratio of a circumference of the compressed seal ring to the compression load; Whether the line sealing load test is passed is determined based on the value of the line sealing load during the compression and rebound process of the sealing ring.

6. The method according to claim 4, characterized in that The forming of a space for applying multiple levels of water pressure to the sealing ring based on the water pressure test device and determining the corresponding relationship between the cross-sectional diameter and the leakage pressure under a preset compression load comprises: Detecting a first load when the sealing ring is compressed to the thickness of the limit ring; determining an adjustment load based on the product of the size of the sealing ring and the medium pressure of the water pressure test fixture; The first load and the adjustment load are added, and the preset compression load is calculated according to the product of the sum and the safety factor.

7. The method according to claim 4, characterized in that The forming of a space for applying multiple levels of water pressure to the sealing ring based on the water pressure test device and determining the corresponding relationship between the cross-sectional diameter and the leakage pressure under a preset compression load comprises: The hydraulic test device at least comprises a hydraulic test pump, a first horizontal hydraulic pressure space is formed based on the hydraulic test pump, and the hydraulic test tool is arranged in the hydraulic pressure space; After maintaining the pressure for a first preset time, detecting leakage of the sealing ring; If the sealing ring leaks, determining the corresponding relationship between the cross-sectional diameter and the leakage pressure under a preset compression load according to the diameter of the sealing ring; If the sealing ring does not leak, the pressure level of the water pressure space is increased at intervals of a first preset pressurization step length, and the process returns to the pressure maintaining step.

8. The method according to claim 4, characterized in that The compression-rebound test device at least includes a helium mass spectrometer leak detector, which detects the leakage of the sealing rings with different cross-sectional diameters during the compression and rebound processes, and determines the change of the sealing load of the sealing ring with the compression amount and the change of the sealing load with the leakage rate, including: Controlling the compression and rebound of the sealing ring based on the sealing ring performance testing device; The inside of the compression rebound test tool is evacuated to a vacuum state based on the helium mass spectrometer leak detector, and helium is sprayed outside the compression rebound test tool; Detecting the deformation and compression load during compression and rebound, and the leakage rate of the compression rebound test fixture; Calculating the linear sealing load according to the ratio of the circumference of the compressed sealing ring to the compression load, and determining the change of the sealing load of the sealing ring with the compression amount; The change of the sealing load with the leakage rate is determined according to the corresponding load value when the leakage rate of the compression rebound test tooling reaches a preset threshold.

Images