Hydrostatic pressure testing fixture

Abstract

The application relates to the technical field of LNG ship containment system detection, in particular to a hydrostatic pressure test tool which comprises a base, a pressure tank and an annular sealing piece. The base is used for bearing a to-be-detected module; the pressure tank is arranged on the base and is detachably connected with the base; one end of the pressure tank is provided with an opening and is sealed by the base; a test cavity for containing test liquid is formed between the base and the pressure tank; the annular sealing piece is sleeved on the outside of the to-be-detected module, the inside of the annular sealing piece is sealingly connected with the edge of the film, the outside of the annular sealing piece extends to the cooperation surface between the base and the pressure tank, and the outside of the annular sealing piece is sealingly abutted with the base and the pressure tank. The application can make the to-be-detected module accept inspection in the state close to the actual installation and loading, so that the comprehensive mechanical properties and structural reliability of the to-be-detected module can be more accurately evaluated.

Description

Technical Field

[0001] This application relates to the field of LNG ship containment system testing technology, and in particular to a hydrostatic pressure testing fixture. Background Technology

[0002] Liquefied natural gas (LNG) vessels are the core equipment for ocean-going natural gas transportation. Their cargo hold containment systems directly bear the functions of maintaining the low-temperature environment (approximately -163°C) inside the tanks and withstanding the static pressure and dynamic sloshing loads of the LNG cargo. Due to its advantages such as high cargo hold utilization and reasonable hull structural stress, membrane-type containment systems have become the mainstream technical solution for large LNG carriers.

[0003] Membrane-type containment systems typically employ a multi-layered composite structure. Taking the MARK III containment system as an example, it comprises, from the inside out: a membrane (stainless steel corrugated plate) in direct contact with LNG, a secondary insulation layer of flexible composite material, and an insulating enclosure composed of reinforced polyurethane foam and plywood. Each layer is ultimately fixed to the hull plating via adhesive bonding and mechanical anchoring. In actual operation, the containment system is installed modularly. Each module serves as a prefabricated unit, integrating the aforementioned functional layers. These modules are sequentially laid and assembled in the dry dock to form a complete bulkhead containment.

[0004] Current methods for quality verification and performance evaluation of enclosure systems primarily focus on testing the mechanical properties of the membrane itself. For example, by applying hydraulic or pneumatic loads to membrane samples, their deformation capacity, yield strength, and fatigue life under different pressure conditions are tested; or airtightness and tensile tests are performed on membrane welds to verify the quality of the weld joints. These testing methods focus on a single membrane component, where the membrane is in a free or simply constrained state under test conditions, which differs significantly from its actual working state within a complete module, supported by an insulating enclosure and bounded by boundary anchoring.

[0005] However, the mechanical response of the enclosure system during service is the result of the synergistic effect of each functional layer. Liquid cargo pressure is transmitted to the insulating housing via the membrane. The compression deformation characteristics of the insulating housing, the bending stiffness of the plywood panels, the interlayer bonding strength, and the constraint stiffness of the anchoring system all directly affect the actual deformation state and stress distribution of the membrane. Isolated testing of the membrane alone cannot reflect the coupling effect of factors such as insulation layer compression, interlayer shear transmission, and boundary constraints on the overall mechanical behavior of the module, making it difficult to accurately assess the structural integrity and deformation performance of the enclosure system module under actual liquid cargo loads.

[0006] Therefore, there is an urgent need for a device that can perform overall pressure testing on individual complete modules of an enclosure system, so that the module under test can be tested under conditions close to actual installation and load, thereby more accurately evaluating the comprehensive mechanical performance and structural reliability of the module under test. Summary of the Invention

[0007] To overcome the above-mentioned shortcomings, this application provides a hydrostatic pressure testing fixture.

[0008] The hydrostatic pressure testing fixture provided in this application adopts the following technical solution: A hydrostatic pressure testing fixture, comprising: The base is used to support the module under test. A pressure vessel is mounted on and detachably connected to the base; one end of the pressure vessel has an opening and is sealed by the base; a test chamber for containing test liquid is formed between the base and the pressure vessel. An annular seal is fitted onto the outside of the module under test. The inner side of the annular seal is sealed to the edge of the membrane of the module under test. The outer side of the annular seal extends to the mating surfaces of the base and the pressure tank, and seals against both the base and the pressure tank.

[0009] By adopting the above technical solution, the module under test is placed on a base, which supports its insulating housing. The inner side of the annular seal is sealed to the edge of the membrane, forming a sealed test chamber between the annular seal, the membrane, and the pressure tank on the side of the membrane away from the insulating housing. After injecting test fluid into the test chamber, the hydraulic load acts directly on the membrane surface. Under pressure, the membrane transfers the load to the insulating housing, which is supported by the base. This completely replicates the mechanical path of the containment system under actual service conditions, where the liquid cargo pressure is transferred layer by layer from the membrane through the insulating housing to the hull structure. This overcomes the shortcomings of existing technologies that only perform isolated pressure tests on the membrane and cannot reflect the collaborative load-bearing characteristics of each functional layer. Since the module under test participates in the pressure process with a complete multi-layer composite structure, the compression deformation of the insulating housing, the shear transfer between the interfaces of each layer, and the actual deformation state of the membrane under the constraint of the insulating housing can all be reflected in the test. This allows the test results to characterize the overall structural integrity of the module, rather than the isolated performance of a single membrane component. The outer side of the annular seal extends between the mating surfaces of the base and the pressure vessel, sealing against both. This achieves a reliable seal for the test chamber and provides a clamping constraint around the module under test, making its boundary conditions closely resemble the anchoring effect under actual ship installation. The pressure vessel and base are detachably connected, facilitating the loading, unloading, and replacement of modules of different specifications, thus improving the versatility and operational efficiency of the testing fixture.

[0010] Optionally, the annular seal includes an annular cylinder and an annular plate; the annular cylinder is sleeved on the outside of the module under test, and its inner wall is sealed to the edge of the film of the module under test; the annular plate is sleeved on the outside of the annular cylinder, and its inner side is sealed to the outer wall of the annular cylinder, and its outer side extends to the mating surface between the base and the pressure tank.

[0011] By adopting the above technical solution, the annular seal is decomposed into two independent functional components: an annular cylinder and an annular plate, thus achieving structural separation of the sealing connection function and the clamping sealing function. The annular cylinder is sleeved on the outside of the module under test, and its inner wall is sealed to the edge of the membrane. Because the annular cylinder has a cylindrical structure, its inner wall can form a circumferentially continuous and sufficiently large contact surface with the edge of the membrane, which is conducive to achieving a reliable sealing connection through processes such as welding. The annular plate is sleeved on the outside of the annular cylinder, and its inner side is sealed to the outer wall of the annular cylinder. The outer side of the annular plate extends to the mating surface between the base and the pressure vessel, bearing the clamping force of the base and the pressure vessel through a plate-like surface contact method, forming a stable surface seal.

[0012] Optionally, the base has a receiving groove on the side that mates with the pressure tank for accommodating the insulating box of the module under test, and the orthographic projection of the annular plate on the side of the base that mates with the pressure tank falls completely within the contour range of the side of the base that mates with the pressure tank.

[0013] By adopting the above technical solution, the insulating housing of the module under test is embedded in the receiving groove. The sidewall of the receiving groove forms a lateral positioning constraint on the insulating housing, simulating the lateral limiting effect of adjacent modules on the module under test under actual ship installation conditions, making the boundary conditions of the module under test closer to the actual service conditions. The orthographic projection of the annular plate on the side of the base used to mate with the pressure tank falls completely within the contour range of that surface, ensuring that when the pressure tank and the base are closed, the clamping force can be applied completely and evenly to the entire pressure-bearing area of ​​the annular plate. This avoids uneven pressure or stress concentration on the sealing surface caused by local suspension of the annular plate, ensuring the reliability and long-term stability of the seal between the annular plate and the base and pressure tank.

[0014] Optionally, the annular cylinder includes a straight section and a corrugated section; one end of the straight section is sealed to the edge of the film of the module under test, and the other end of the straight section is connected to the corrugated section; one end of the corrugated section opposite to the straight section is sealed to the annular plate, and the corrugated section is configured to have a preset elastic elongation at least along the axial direction of the annular cylinder.

[0015] By adopting the above technical solution, the annular cylinder is composed of a straight cylindrical section and a corrugated section connected in series. One end of the straight cylindrical section is sealed to the edge of the membrane, providing a rigid welding or adhesive substrate to ensure the structural strength and sealing integrity of the connection between the annular cylinder and the membrane. The corrugated section is located between the straight cylindrical section and the annular plate. When the hydraulic load in the test chamber acts on the membrane and causes the membrane to deform normally, the corrugated section can adaptively elongate along the axial direction, avoiding the annular cylinder from applying axial constraint force to the edge of the membrane through a rigid connection. If the annular cylinder is a rigid structure as a whole, it will share and absorb part of the pressure load that should be transmitted from the membrane to the insulation box during the membrane deformation process, resulting in the actual load borne by the insulation box being significantly lower than the hydraulic value in the test chamber, causing the test results to deviate from the actual working conditions. The elastic deformation capability of the corrugated section ensures that the edge of the membrane is not rigidly pulled by the annular cylinder during the compression process, and the hydraulic load can be transmitted to the insulation box more realistically and completely through the membrane, thereby improving the accuracy of the test data in characterizing the actual mechanical response of the enclosure system module.

[0016] Optionally, the pressure vessel includes a vessel body and a pressure plate; the vessel body has an opening at one end near the base, and the test chamber is formed between the inner cavity of the vessel body and the base; the pressure plate is disposed inside the vessel body, and the side of the pressure plate is in sealing contact with the inner wall of the vessel body; an annular shoulder is provided on the inner wall of the vessel body, one side of the pressure plate is in sealing contact with the annular shoulder, and the other side of the pressure plate is used to in sealing contact with the base; a through hole is provided on the pressure plate, penetrating both sides of the pressure plate; the outer side of the annular seal extends to the contact surface between the base and the pressure plate.

[0017] By adopting the above technical solution, when the test fluid is injected into the test chamber and pressurized, hydraulic pressure acts on the side of the pressure plate facing the annular shoulder. Because the annular shoulder acts as a stop and limit for the pressure plate, the hydraulic pressure in the test chamber generates a net pressure on the pressure plate towards the base. This net pressure is transmitted through the pressure plate to the annular seal, causing the annular seal to be clamped between the pressure plate and the base. Furthermore, the higher the pressure in the test chamber, the greater the clamping force exerted by the pressure plate on the annular seal, and the greater the pressure on the sealing surface between the annular seal and the pressure plate and base. This creates a self-reinforcing sealing effect, ensuring that the sealing reliability increases synchronously with the test pressure without the need for an additional pre-tightening mechanism. The connecting hole allows the test fluid to flow from the inner cavity of the tank to the space between the pressure plate and the base, directly acting on the membrane surface, ensuring the effective application of the hydraulic load.

[0018] Optionally, the orthographic projection of the connecting hole on the side of the base that mates with the pressure vessel falls entirely within the contour of the inner cavity of the annular cylinder.

[0019] By adopting the above technical solution, it is ensured that the test liquid flows out through the connecting hole and directly enters the space enclosed by the annular cylinder and acts on the effective test area of ​​the membrane. This avoids the test liquid flow directly impacting the sealing surface of the annular seal or flowing to the sealing area outside the annular cylinder. This ensures that the hydraulic load is applied evenly and accurately to the membrane surface, and also eliminates the erosion and interference of the liquid flow on the sealing structure, which is conducive to maintaining the long-term reliability of the seal.

[0020] Optionally, sealing rings are provided between the pressure plate and the inner wall of the tank, between the pressure plate and the annular shoulder, between the pressure plate and the annular seal, and between the base and the annular seal.

[0021] By adopting the above technical solution, the elastic deformation of the sealing ring can compensate for minor unevenness caused by machining tolerances, assembly gaps, or high-pressure deformation on each mating surface, ensuring that each mating surface maintains a reliable sealing state under high-pressure conditions. Multiple sealing rings form a hierarchical sealing defense line; even if a single sealing surface experiences minor leakage due to extreme conditions, adjacent sealing rings can prevent further leakage, improving the redundancy and safety margin of the overall sealing system of the test chamber.

[0022] Optionally, the tank body includes an inner tank and an outer tank spaced apart, with a vacuum cavity formed between the inner tank and the outer tank.

[0023] By adopting the above technical solution, the gas molecule density inside the vacuum chamber is extremely low, and the thermal conductivity approaches zero, effectively isolating the external environment from the test chamber through heat conduction and convection. When the test requires the use of a cryogenic test fluid to simulate the actual temperature conditions of LNG cargo, the vacuum chamber can significantly reduce the rate of heat intrusion into the test chamber, suppress temperature fluctuations and local vaporization of the test fluid, and maintain a stable temperature and pressure field within the test chamber, thereby improving the controllability of test conditions and the accuracy of test data under cryogenic conditions.

[0024] Optionally, it also includes a connecting assembly for detachably connecting the base and the pressure tank. The connecting assembly includes a first flange, a second flange, and a plurality of connecting parts. The first flange is disposed on the base, the second flange is disposed on the pressure tank and abuts against the first flange, and the plurality of connecting parts are used for detachably connecting the first flange and the second flange.

[0025] By adopting the above technical solution, the flange connection structure ensures that the connection force between the base and the pressure vessel is evenly distributed circumferentially, guaranteeing that the mating surfaces maintain uniform clamping pressure under high-pressure conditions without localized opening or uneven loading. Multiple connectors are arranged circumferentially at intervals, allowing for adjustments to the preload of each connector to meet different pressure ratings. Furthermore, the detachable nature of the connectors enables rapid separation and reassembly of the base and pressure vessel, facilitating the loading, unloading, and replacement of the module under test, thus improving operational efficiency and the reusability of the tooling.

[0026] Optionally, the pressure tank is provided with an inlet / outlet at the bottom and a pressure balance port at the top.

[0027] By adopting the above technical solution, the inlet and outlet are located at the bottom of the pressure tank. During injection, the test liquid gradually fills the test chamber from bottom to top, which helps to continuously drive residual gas in the chamber upwards and discharge it through the pressure balance port at the top of the pressure tank. This avoids residual air bubbles in the test chamber interfering with the uniformity of the hydraulic load and ensures that the load distribution on the diaphragm surface is uniform and consistent. The pressure balance port is located at the top of the pressure tank. After the injection and venting are completed, a pressure sensor or safety valve can be connected to achieve real-time monitoring of the pressure in the test chamber and overpressure safety protection during the test, improving the controllability and safety of the test process.

[0028] In summary, this application includes the following beneficial technical effects: 1. Through the coordinated cooperation of the insulating box supporting the module under test on the base, the pressure tank forming a test chamber with the base, and the inner side of the annular seal sealing the edge of the membrane, the hydraulic load is directly applied to the membrane surface and then transferred to the base layer by layer through the insulating box. This completely reproduces the mechanical transmission path of the liquid cargo pressure from the membrane through the insulating box to the hull structure under actual service conditions. It overcomes the shortcomings of the existing technology, which only performs isolated pressure tests on the membrane and cannot reflect the compression deformation of the insulating box, the shear transmission between layers, and the collaborative bearing characteristics of each functional layer. It realizes a true assessment of the overall structural integrity and deformation performance of a single complete module of the enclosure system under near-actual installation and loading conditions. 2. By setting a corrugated part in the annular cylinder and making it have a preset elastic elongation at least along the axial direction of the annular cylinder, the corrugated part adaptively elongates when the membrane undergoes normal deformation under hydraulic load. This avoids the annular cylinder sharing the pressure load that should be transmitted from the membrane to the insulation box in a rigid connection manner, so that the hydraulic load is transmitted to the insulation box more completely through the membrane, thereby improving the accuracy of the test data in characterizing the actual mechanical response of the enclosure system module. 3. By setting a pressure plate inside the pressure tank and using an annular shoulder to prevent and limit the backflow of the pressure plate, the hydraulic pressure in the test chamber generates a net pressure on the pressure plate towards the base. This net pressure is transmitted through the pressure plate to the annular seal, causing the sealing surface pressure between the seal and the pressure plate and the base to increase synchronously with the test pressure, forming a self-reinforcing sealing effect. This ensures the sealing reliability under high pressure conditions without the need for an additional pre-tightening mechanism. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the hydrostatic pressure testing fixture according to an embodiment of this application.

[0030] Figure 2 This is an exploded view of the hydrostatic pressure testing fixture according to an embodiment of this application.

[0031] Figure 3 This is a schematic diagram of the internal structure of the hydrostatic pressure testing fixture according to an embodiment of this application.

[0032] Figure 4 yes Figure 3 A magnified view of part A in the middle.

[0033] Explanation of reference numerals in the attached drawings: 100, Module under test; 101, Insulating box; 102, Membrane; 1, Base; 11, Receiving groove; 2, Pressure tank; 21, Tank body; 211, Inner tank body; 212, Outer tank body; 213, Vacuum chamber; 214, Annular shoulder; 22, Pressure plate; 221, Connecting hole; 23, Liquid inlet / outlet; 24, Pressure balance port; 3, Annular seal; 31, Annular cylinder; 311, Straight cylinder section; 312, Corrugated section; 32, Annular plate; 4, Connecting assembly; 41, First flange; 42, Second flange; 43, Connecting piece; 5, Sealing ring; 6, Test chamber. Detailed Implementation

[0034] The following combination Figures 1-4 This application will be described in further detail.

[0035] This application discloses a hydrostatic pressure testing fixture for performing overall pressure testing on a single complete module of an LNG ship containment system, allowing the module under test to be inspected under conditions close to actual installation and loading. It should be noted that the terms "annular," "annular cylinder," and "annular plate" mentioned in this application refer to a continuous, closed contour structure formed in the circumferential direction, and do not specifically refer to a perfectly circular cross-section.

[0036] Reference Figure 1 and Figure 2 In this embodiment, the hydrostatic pressure test fixture includes a base 1, a pressure tank 2, an annular seal 3, and a connecting assembly 4.

[0037] The base 1 is a plate-shaped or block-shaped metal component with sufficient structural strength, used to support the module under test 100. A receiving groove 11 is provided on the side of the base 1 that mates with the pressure tank 2. The shape and size of the receiving groove 11 are adapted to the outer contour of the insulating box 101 of the module under test 100.

[0038] In use, the insulating box 101 of the module under test 100 is embedded in the receiving groove 11. The bottom surface of the insulating box 101 is supported by the bottom of the receiving groove 11, and the side of the insulating box 101 is laterally limited by the groove wall of the receiving groove 11, thereby simulating the support of the inner shell plate of the ship on the insulating box 101 and the lateral constraint of the adjacent module on the module under test in the actual ship installation state.

[0039] Pressure tank 2 is located above base 1 and is detachably connected to base 1. One end of pressure tank 2 has an opening, and the opening of pressure tank 2 faces base 1 and is sealed by base 1. A test chamber 6 for containing test liquid is formed between base 1 and pressure tank 2.

[0040] The annular seal 3 is sleeved on the outside of the module to be tested 100. The inner side of the annular seal 3 is sealed to the edge of the membrane 102. The outer side of the annular seal 3 extends to the mating surface between the base 1 and the pressure tank 2, and seals against both the base 1 and the pressure tank 2.

[0041] The connecting assembly 4 is used to detachably connect the base 1 and the pressure tank 2. The connecting assembly 4 includes a first flange 41, a second flange 42, and a plurality of connecting parts 43. The first flange 41 is fixed to the outer periphery of the base 1, and the second flange 42 is fixed to the outer periphery of the open end of the pressure tank 2.

[0042] When the pressure tank 2 is placed above the base 1, the second flange 42 is vertically aligned with the first flange 41. Multiple connecting pieces 43 are arranged circumferentially at intervals for detachable connection of the first flange 41 and the second flange 42. The connecting pieces 43 can be a combination of bolts and nuts; the bolts pass sequentially through corresponding through holes on the first flange 41 and the second flange 42 and are then tightened by the nuts. The multiple connecting pieces 43 are evenly distributed circumferentially, ensuring that the connection force between the base 1 and the pressure tank 2 acts evenly circumferentially, guaranteeing uniform clamping pressure on the mating surfaces under high-pressure conditions.

[0043] Reference Figure 3 and Figure 4 Specifically, the pressure vessel 2 includes a vessel body 21 and a pressure plate 22. The vessel body 21 is a cylindrical structure that is closed at one end and open at the other end, and the vessel body 21 abuts against the base 1 with the open end facing the base 1. The test chamber 6 is formed between the inner cavity of the vessel body 21 and the base 1, and the outer side of the annular seal 3 extends to the abutment surface between the base 1 and the pressure plate 22.

[0044] An annular shoulder 214 is provided on the inner wall of the tank body 21, and the annular shoulder 214 extends continuously along the circumference of the tank body 21. A pressure plate 22 is provided in the inner cavity of the tank body 21, and the pressure plate 22 is a plate-shaped component adapted to the cross-sectional shape of the inner cavity of the tank body 21. The side of the pressure plate 22 is in sealing contact with the inner wall of the tank body 21, the side of the pressure plate 22 facing the closed end of the tank body 21 is in sealing contact with the annular shoulder 214, and the side of the pressure plate 22 facing the base 1 is used to seal contact with the base 1. A through hole 221 is provided on the pressure plate 22, which connects the space between the inner cavity of the tank body 21 above the pressure plate 22 and the space between the base 1 below the pressure plate 22.

[0045] The pressure tank 2 has an inlet / outlet port 23 at its bottom, which is used to connect to an external hydraulic supply system to inject and discharge the test liquid. The pressure tank 2 has a pressure balance port 24 at its top. Specifically, the inlet / outlet port 23 is located on the side wall of the tank body 21 near the base 1, and the pressure balance port 24 is located on the end face of the tank body 21 away from the base 1. Both the inlet / outlet port 23 and the pressure balance port 24 are equipped with valves for controlling the switch.

[0046] During injection, the test fluid enters through the inlet / outlet 23 and gradually fills the inner cavity of the tank 21 and the test chamber 6 from bottom to top. Residual gas in the cavity is continuously driven upward and discharged through the pressure balance port 24, avoiding interference from residual air bubbles on the uniformity of hydraulic load. After the injection and venting are completed, the pressure balance port 24 can be connected to a pressure sensor to monitor the pressure in the test chamber 6 in real time, or connected to a safety valve to achieve overpressure protection.

[0047] During the test, the test fluid is injected into the inner cavity of the tank 21 through the inlet / outlet 23. The test fluid flows through the connecting hole 221 to the space between the pressure plate 22 and the base 1, filling the test cavity 6. Since the hydraulic pressure within the test cavity 6 acts simultaneously on both the side of the pressure plate 22 facing the base 1 and the side facing the annular shoulder 214, and the annular shoulder 214 acts as a stop and limit for the pressure plate 22, preventing it from moving away from the base 1, the hydraulic pressure within the test cavity 6 generates a net pressure on the pressure plate 22 towards the base 1. This net pressure causes the pressure plate 22 to self-reinforce the sealing structure between itself and the base 1; the higher the test pressure, the greater the clamping force.

[0048] Preferably, the tank 21 includes an inner tank 211 and an outer tank 212 spaced apart, with a vacuum cavity 213 formed between the inner tank 211 and the outer tank 212. The gas in the vacuum cavity 213 is evacuated to an extremely low pressure state. The extremely low thermal conductivity of the vacuum isolates the external environment from the test cavity 6, thus preventing heat from entering the test cavity 6 when a cryogenic test liquid is used to simulate the actual temperature conditions of LNG cargo, and maintaining a stable temperature and pressure field within the test cavity 6.

[0049] Reference Figure 3 and Figure 4 Specifically, the annular seal 3 includes an annular cylinder 31 and an annular plate 32; the annular cylinder 31 is an annular cylindrical component whose inner cavity shape matches the outer contour of the module to be tested 100, and the annular plate 32 is an annular plate component whose inner hole shape matches the outer contour of the annular cylinder 31.

[0050] The annular cylinder 31 is sleeved on the outside of the module to be tested 100. The inner wall of the annular cylinder 31 is sealed to the edge of the diaphragm 102. The sealing connection can be achieved by welding or gluing. The outer side of the annular plate 32 extends radially outward to the mating surface between the base 1 and the pressure plate 22 of the pressure tank 2. The inner wall of the annular cylinder 31 can form a circumferentially continuous and sufficiently large contact surface with the edge of the diaphragm 102, which is beneficial for the implementation of welding or gluing processes and the guarantee of joint quality. The outer side of the annular plate 32 is clamped to the base 1 by the pressure plate 22, realizing the circumferential sealing of the test chamber 6.

[0051] Preferably, the orthographic projection of the connecting hole 221 on the side of the base 1 that is used to cooperate with the pressure tank 2 falls completely within the contour range of the inner cavity of the annular cylinder 31, ensuring that the test liquid flows out through the connecting hole 221 and directly enters the space enclosed by the annular cylinder 31 and acts on the effective test area of ​​the membrane 102, avoiding the liquid flow impacting the sealing surface.

[0052] Reference Figure 3 and Figure 4 In this embodiment, the annular cylinder 31 includes a straight cylindrical portion 311 and a corrugated portion 312. The straight cylindrical portion 311 has a smooth cylindrical wall structure with a uniform cross-section. The inner wall of one end of the straight cylindrical portion 311 is sealed to the edge of the film 102 by welding or adhesive bonding, providing a flat and rigid substrate for the welding or adhesive bonding process. The other end of the straight cylindrical portion 311 is connected to the corrugated portion 312. The cylindrical wall of the corrugated portion 312 is corrugated, forming alternating peaks and troughs along the axial direction of the annular cylinder 31. The end of the corrugated portion 312 opposite to the straight cylindrical portion 311 is sealed to the inner side of the annular plate 32. The corrugated portion 312 is configured to have a predetermined elastic elongation at least along the axial direction of the annular cylinder 31, that is, the corrugated portion 312 can elongate a certain distance within the elastic range in the axial direction of the annular cylinder 31.

[0053] When the hydraulic load in the test chamber 6 acts on the membrane 102 to cause it to deform in the normal direction, the corrugated part 312 will elastically elongate accordingly. This avoids the rigid constraint of the annular cylinder 31 from sharing the pressure load that should be transmitted from the membrane 102 to the insulating box 101, and ensures that the test data can truly reflect the mechanical response of the enclosure system module.

[0054] Preferably, sealing rings 5 ​​are provided between the pressure plate 22 and the inner wall of the inner tank 211, between the pressure plate 22 and the annular shoulder 214, between the pressure plate 22 and the upper surface of the annular plate 32 of the annular seal 3, and between the base 1 and the lower surface of the annular plate 32 of the annular seal 3.

[0055] The sealing ring 5 can be made of an elastic material that is resistant to low temperatures and hydraulic media, such as fluororubber or polytetrafluoroethylene (PTFE) sealing rings. Each sealing ring 5 on each mating surface forms an independent sealing barrier. Its elastic deformation can compensate for minor unevenness on the mating surfaces caused by machining tolerances and high-pressure deformation, ensuring that all mating surfaces maintain a reliable sealing state under high-pressure conditions. Multiple sealing rings 5 ​​form a hierarchical sealing defense line, improving the redundancy and safety margin of the overall sealing system of the test chamber 6.

[0056] The implementation principle of this application embodiment is as follows: Before the test, the insulating box 101 of the module under test 100 is embedded in the receiving groove 11 of the base 1, with the film 102 facing upwards. The annular cylinder 31 is sleeved on the outside of the module under test 100, so that the inner wall of the straight cylinder 311 is aligned with the edge of the film 102, and the two are sealed together by welding or adhesive bonding. The annular plate 32 is sleeved on the outside of the annular cylinder 31 and sealed to the end of the corrugated part 312, and the annular plate 32 extends horizontally to the surface of the base 1 outside the receiving groove 11.

[0057] Subsequently, the pressure tank 2 is hoisted above the base 1, with the open end of the tank body 21 facing downwards. The pressure plate 22 falls with the tank body 21 until its lower surface is in contact with the upper surface of the annular plate 32. The tank body 21 continues to fall so that the second flange 42 aligns with the first flange 41, and the two are locked together by multiple connecting pieces 43. At this point, under its own weight and the pre-tightening force of the connecting pieces 43, the pressure plate 22 clamps the annular plate 32 between itself and the base 1, and the sealing rings 5 ​​on each mating surface are deformed under pressure to form an initial seal.

[0058] During the test, test liquid is injected into the inner cavity of the tank 21 through the inlet / outlet port 23. The test liquid flows through the connecting hole 221 into the test cavity 6 between the pressure plate 22 and the base 1, directly contacting and immersing the surface of the membrane 102. Liquid is continuously injected and the gas in the cavity is discharged through the pressure balance port 24. After the cavity is completely filled with test liquid, the pressure balance port 24 is closed, and the pressure is continued to be increased to the target test pressure.

[0059] During pressurization, the hydraulic pressure within the test chamber 6 acts uniformly on the entire exposed surface of the membrane 102. Under pressure, the membrane 102 undergoes normal deformation, transferring the load to the insulating housing 101 below. The insulating housing 101 then undergoes compressive deformation, supported by the bottom of the receiving groove 11. The corrugated portion 312 adaptively elongates axially with the normal deformation of the membrane 102, without generating additional rigid constraint forces on the edges of the membrane 102. Simultaneously, the hydraulic pressure within the test chamber 6 generates a net pressure on the pressure plate 22 towards the base 1. This net pressure causes the clamping force of the pressure plate 22 on the annular plate 32 to increase synchronously with the test pressure, forming a self-reinforcing seal and ensuring the sealing reliability of the test chamber 6 under high-pressure conditions.

[0060] During the test, the deformation state of the thin film 102 can be monitored by strain gauges or displacement sensors arranged on the surface of the thin film 102, and the pressure value in the test chamber 6 can be monitored by pressure sensors, thereby obtaining the mechanical response data of the module under test 100 under different pressure conditions and evaluating its overall structural integrity and deformation performance.

[0061] After the test, the test liquid is discharged through the inlet / outlet 23, the connector 43 is disassembled, the pressure tank 2 is lifted off, and the module to be tested 100 is taken out to complete the test.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hydrostatic pressure testing fixture, characterized in that, include: Base (1) is used to support the module under test (100). A pressure tank (2) is disposed on the base (1) and detachably connected to the base (1); one end of the pressure tank (2) is provided with an opening and is sealed by the base (1); a test chamber (6) for containing test liquid is formed between the base (1) and the pressure tank (2). An annular seal (3) is fitted on the outside of the module to be tested (100). The inner side of the annular seal (3) is sealed to the edge of the film (102) of the module to be tested (100). The outer side of the annular seal (3) extends to the mating surface between the base (1) and the pressure tank (2) and is sealed to both the base (1) and the pressure tank (2). The annular seal (3) includes an annular cylinder (31) and an annular plate (32); the annular cylinder (31) is sleeved on the outside of the module to be tested (100), and its inner wall is sealed to the edge of the film (102) of the module to be tested (100); the annular plate (32) is sleeved on the outside of the annular cylinder (31), and its inner side is sealed to the outer wall of the annular cylinder (31), and its outer side extends to the mating surface between the base (1) and the pressure tank (2); The base (1) has a receiving groove (11) for accommodating the insulating box (101) of the module to be tested (100) on one side for cooperating with the pressure tank (2). The orthographic projection of the annular plate (32) on the side of the base (1) for cooperating with the pressure tank (2) falls completely within the outline of the side of the base (1) for cooperating with the pressure tank (2). The pressure tank (2) has an inlet / outlet port (23) at the bottom and a pressure balance port (24) at the top.

2. The hydrostatic pressure testing fixture according to claim 1, characterized in that: The annular cylinder (31) includes a straight cylindrical portion (311) and a corrugated portion (312); one end of the straight cylindrical portion (311) is sealed to the edge of the film (102) of the module under test (100), and the other end of the straight cylindrical portion (311) is connected to the corrugated portion (312); the end of the corrugated portion (312) facing away from the straight cylindrical portion (311) is sealed to the annular plate (32), and the corrugated portion (312) is configured to have a preset elastic elongation at least along the axial direction of the annular cylinder (31).

3. The hydrostatic pressure testing fixture according to claim 1, characterized in that: The pressure tank (2) includes a tank body (21) and a pressure plate (22); the tank body (21) is open at one end near the base (1), and the test chamber (6) is formed between the inner cavity of the tank body (21) and the base (1); the pressure plate (22) is located inside the tank body (21), and the side of the pressure plate (22) is sealed against the inner wall of the tank body (21); an annular shoulder (214) is provided on the inner wall of the tank body (21), one side of the pressure plate (22) is sealed against the annular shoulder (214), and the other side of the pressure plate (22) is used to seal against the base (1), and a through hole (221) is provided on the pressure plate (22) through both sides; the outer side of the annular seal (3) extends to the abutment surface between the base (1) and the pressure plate (22).

4. The hydrostatic pressure testing fixture according to claim 3, characterized in that: The orthographic projection of the connecting hole (221) on the side of the base (1) that mates with the pressure tank (2) falls entirely within the contour of the inner cavity of the annular cylinder (31).

5. The hydrostatic pressure testing fixture according to claim 3, characterized in that: A sealing ring (5) is provided between the pressure plate (22) and the inner wall of the tank (21), between the pressure plate (22) and the annular shoulder (214), between the pressure plate (22) and the annular seal (3), and between the base (1) and the annular seal (3).

6. The hydrostatic pressure testing fixture according to claim 3, characterized in that: The tank (21) includes an inner tank (211) and an outer tank (212) spaced apart, and a vacuum cavity (213) is formed between the inner tank (211) and the outer tank (212).

7. The hydrostatic pressure testing fixture according to claim 1, characterized in that: It also includes a connecting assembly (4) for detachably connecting the base (1) and the pressure tank (2), the connecting assembly (4) including a first flange (41), a second flange (42) and a plurality of connectors (43); the first flange (41) is disposed on the base (1), the second flange (42) is disposed on the pressure tank (2) and docks with the first flange (41), and the plurality of connectors (43) are used for detachably connecting the first flange (41) and the second flange (42).

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