SCM socket working condition simulation water pressure testing device and control method thereof

Abstract

This invention discloses a deep-sea equipment testing technology, aiming to provide a simulated hydrostatic testing device and its control method for SCM sockets. The key technical points include a device body for testing assemblies of SCM sockets and dry-plug sockets. The device body comprises: a watertight test fixture with a sealed oil cavity inside; an installation interface communicating with the oil cavity and used for installing the assembly on one side of the watertight test fixture; and an external connector communicating with the oil cavity and used for connecting an oil pipe on the other side of the watertight test fixture; an oil pipe configured as a flexible hose; an oil filling interface at one end of the oil pipe for filling with oil, and a sealed connection at the other end to the external connector on the watertight test fixture; the interior of the oil pipe and the oil cavity form a sealed oil tank filled with insulating oil; and a hydrostatic tank. This invention is applicable to the field of deep-sea equipment testing technology.

Description

Technical Field

[0001] This invention relates to a deep-sea equipment testing technology, and more specifically, to an SCM socket operating condition simulation water pressure testing device and its control method. Background Technology

[0002] Currently, withstand voltage tests on SCM sockets and their dry-plug sockets are typically conducted by placing the entire unit in a pressure testing tank. The traditional method involves filling the testing system with oil to simulate deep-sea pressure, but this method has the following drawbacks: 1. Requires a large amount of oil, resulting in high oil costs; 2. The pressure testing tank system can only test a small number of specimens at a time, resulting in low efficiency; 3. Conventional pressure testing systems mostly use water pressure testing, which is inconsistent with the oil pressure balance structure actually used in SCM, resulting in deviations between the test results and actual operating conditions.

[0003] Therefore, there is an urgent need for a testing solution that can more realistically, economically, and efficiently simulate the actual working environment of SCM sockets. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a simple, low-cost, and easy-to-operate SCM socket operating condition simulation water pressure testing device and its control method.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a water pressure testing device for simulating the working conditions of an SCM socket, comprising a device body for testing an assembly of an SCM socket and a dry-plug socket, characterized in that: the device body comprises: Watertight test fixture: It has a closed oil cavity inside. One side of the watertight test fixture is provided with an installation interface that communicates with the oil cavity and is used to install the assembly. The other side of the watertight test fixture is provided with an external connector that communicates with the oil cavity and is used to connect the oil pipe. Oil pipe: The oil pipe is configured as a flexible hose; one end of the oil pipe is provided with an oil filling interface for filling with oil, and the other end is sealed to an external connector provided on the watertight test fixture; the interior of the oil pipe and the oil cavity form a closed oil chamber, which is filled with insulating oil; the oil pipe is used to automatically adjust the closed oil chamber to balance the water pressure when the water pressure in the pressure tank changes, so that the oil pressure in the oil chamber is consistent with the water pressure in the pressure tank. Hydraulic tank: It is configured as a sealable pressure tank. The hydraulic tank is used to provide a preset hydraulic environment. The watertight test fixture and the oil pipe can be placed inside the hydraulic tank as a whole.

[0006] The present invention is further configured such that: a sealing ring is provided at the installation interface of the watertight test fixture, the sealing ring is used to seal the connection gap between the assembly and the watertight test fixture, and the ratio of the thickness of the sealing ring to the depth of the installation interface is 1:3-1:5.

[0007] A control method for an SCM socket operating condition simulation water pressure testing device, characterized by comprising the following steps: S1. Installation of the product under test: Assemble the SCM socket and the dry plug socket into an assembly, and install it on the installation interface of the watertight test fixture by means of threaded connection or snap-fit ​​connection, ensuring that there are no visible gaps in the connection gap; S2. Oil pipe connection and oil filling: Connect the oil pipe to the external joint of the watertight test fixture, connect the micro pump to the oil filling interface, and inject an appropriate amount of insulating oil into the oil pipe and the oil cavity. After the oil filling is completed, remove the micro pump. S3. Water pressure tank sealing: After the oil filling is completed, put the entire device into the water pressure tank, then close the sealing door of the water pressure tank and lock the sealing door through the locking mechanism; S4. Water pressure loading and balancing: Start the pressurization system of the water pressure tank to gradually increase the water pressure in the water pressure tank to the preset target water pressure at a rate of 0.5-1MPa / min. At the same time, the oil pipe balances the oil pressure in the oil chamber of the watertight test fixture with the water pressure in the water pressure tank. During the loading process, record the water pressure value of the water pressure tank and the oil pressure value of the oil chamber of the watertight test fixture every 5 minutes, calculate the difference between the two. If the difference continues to exceed the set threshold, trigger the alarm mechanism to stop the test and notify the operator. S5. Pressure Holding and Monitoring: When the difference between the oil pressure in the oil chamber of the watertight test fixture and the water pressure in the water pressure tank is <0.1MPa, the pressure holding stage begins. The pressure holding time is set to 30min. During the pressure holding process, the water pressure fluctuation in the water pressure tank and the oil pressure fluctuation in the oil chamber of the watertight test fixture are monitored in real time. If the water pressure fluctuation exceeds ±0.05MPa or the oil pressure fluctuation exceeds ±0.03MPa within 10 consecutive minutes, the system is deemed to have a leakage risk. S6. Leakage check: Observe whether there is oil seepage on the surface of the oil chamber of the watertight test fixture, and at the same time check whether there is oil dripping at the connection of the oil pipe. If there is oil seepage or dripping, the test is deemed unqualified. If not, proceed to the next step. S7. Pressure Relief and Sampling: Activate the pressure relief system of the pressure tank to reduce the water pressure inside the pressure tank to normal pressure at a rate of 1-2 MPa / min, open the sealing door of the pressure tank, and take out the product to be tested. S8. Appearance and Electrical Testing: Perform an appearance inspection on the removed product to observe whether the assembly has physical damage, deformation, cracks or leakage. Then perform electrical testing, which includes insulation resistance testing and withstand voltage testing. If both tests are qualified, the test is deemed qualified; otherwise, the test is deemed unqualified.

[0008] The present invention is further configured such that: in step S5, the control method for pressure holding and monitoring is as follows: When the pressure holding begins, the reference oil pressure value Pv is set as the oil pressure value of the oil chamber of the watertight test fixture, and the reference water pressure value Ps is set as the water pressure value of the water pressure tank; The water pressure value P0 of the water pressure tank and the oil pressure value P of the oil cavity of the watertight test fixture are collected in real time, and the oil pressure change rate RP=(P-Pv) / Pv and the water pressure change rate RP0=(P0-Ps) / Ps are calculated. If RP > 0.005 and the duration exceeds 5 minutes, and RP0 > 0.003 and the duration exceeds 5 minutes, it is determined that the system leakage has caused the oil pressure and water pressure to rise synchronously, triggering an alarm and stopping the pressure holding, then proceeding to S6; If RP < -0.005 and the duration exceeds 5 minutes, and RP0 < -0.003 and the duration exceeds 5 minutes, it is determined that there is air intake or oil leakage in the system, causing the oil pressure and water pressure to drop synchronously, triggering an alarm and stopping pressure holding, and proceeding to S6; If |RP|≤0.005, |RP0|≤0.003, but |RP-RP0|>0.002, and the duration exceeds 10 minutes, it is determined that there is a local leak or blockage in the oil cavity of the oil pipe or watertight test fixture, triggering an alarm and switching to S6; If none of the above situations occur, maintain the pressure and continue monitoring.

[0009] The present invention is further configured such that, in step S7, the depressurization and sampling include: When the pressure relief system is started, the initial pressure relief rate is set to 1.5 MPa / min. At the same time, the water pressure value P0 in the pressure tank and the oil pressure value P in the oil chamber of the watertight test fixture are monitored, and the difference ΔP between the two is calculated. If ΔP > 0.2 MPa and lasts for more than 5 seconds, it is determined that the oil circuit balance was disrupted during the pressure relief process, including but not limited to oil pipe blockage; then the pressure relief rate is reduced to 0.8 MPa / min until ΔP ≤ 0.2 MPa. If the pressure relief rate is too fast, causing water pressure fluctuations to exceed ±0.1MPa or oil pressure fluctuations to exceed ±0.05MPa for more than 3 seconds, the pressure relief rate is deemed unreasonable. The pressure relief rate is then adjusted to 1MPa / min, and pressure relief continues until the water pressure drops to normal atmospheric pressure. When the water pressure drops to normal pressure (P0≤0.01MPa) and the oil pressure drops to a level close to the water pressure (P≤0.02MPa), the pressure relief is considered complete, and the sealed door is opened to remove the tested product.

[0010] The beneficial effects of this invention are: 1. By integrating a watertight test fixture, oil pipes, and a pressure tank, this invention accurately replicates the actual underwater operating conditions of SCM sockets. The sealed oil chamber and oil pipes form a sealed oil tank filled with an appropriate amount of insulating oil, effectively protecting the electrical components of the tested assembly and preventing short circuits and insulation failures during water pressure testing. The installation interface is compatible with the assembly, and external connectors can be quickly and sealed to the oil pipes. The entire device can be placed inside a sealed, pressure-bearing pressure tank, completely simulating the underwater pressure environment, and simultaneously testing multiple assemblies. Because the oil pipes are designed as flexible hoses, they can transmit pressure and thus match the water pressure changes in the pressure tank in real time, achieving pressure balance. This solves the problem of oil and water pressure imbalance in traditional testing devices, ensuring that the test pressure is highly consistent with the actual operating conditions, significantly improving the authenticity of the test results. This invention has a simple structure, high integration, low cost, and strong adaptability, and can efficiently complete the watertightness performance testing of assemblies.

[0011] 2. The SCM socket operating condition simulation water pressure testing device of this invention achieves efficient sealing of the gap between the assembly and the fixture by optimizing the ratio of the sealing ring thickness to the installation interface depth by 1:3-1:5. This prevents leakage of insulating oil from the sealed oil tank and avoids external water pressure from seeping into the oil cavity and interfering with the test pressure. This ratio design allows the sealing ring to obtain the best compression deformation. If it is too thick, it will easily cause the assembly to deform and loosen. If it is too thin, the seal will fail. The precise ratio takes into account both sealing performance and assembly accuracy, reducing pressure leakage problems during the test process from the root, ensuring accurate and reliable test data, simplifying product assembly operations, improving testing efficiency and the long-term stability of the device.

[0012] 3. Control Method of SCM Socket Operating Condition Simulation Hydrostatic Testing Device This method constructs a standardized, end-to-end SCM socket hydrostatic testing system, encompassing product installation, oil filling, sealing, load balancing, pressure holding monitoring, leak detection, pressure release sampling, and electrical testing. It features rigorous logic, simple operation, and a short cycle time, improving testing efficiency. A pressurization rate of 0.5-1 MPa / min and a depressurization rate of 1-2 MPa / min prevent sudden pressure changes from damaging the product. The 30-minute pressure holding time meets industry standards. Combined with pressure monitoring, visual inspection, and electrical testing, it comprehensively assesses product performance. This method exhibits low human error, high automation, and accurate simulation of underwater operating conditions. The accurate test structure makes it suitable for batch testing, significantly improving testing efficiency while ensuring the safety of both the product and the device.

[0013] 4. In this invention, by setting a benchmark pressure value and calculating the pressure change rate, accurate fault identification and graded alarms are achieved. It can quickly distinguish between abnormalities such as overall leakage, air intake, and local blockage, strictly control the fluctuation threshold, and avoid ineffective pressure holding and fault expansion. This method abandons the drawbacks of traditional single pressure monitoring, judges local minor faults by the difference in the rate of change, greatly improves the monitoring accuracy, can detect potential leakage hazards in a timely manner, and ensures that the pressure holding data is true and effective. Automated monitoring reduces the error of manual inspection, the judgment standard is clear, and the accuracy of watertightness test results is effectively improved. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the SCM socket working condition simulation water pressure test device of the present invention.

[0015] Figure 2 This is a schematic diagram of the watertight test fixture and tubing assembly after assembly.

[0016] Figure 1-2 Reference numerals in the attached drawings: 1. Watertight test fixture; 2. Oil chamber; 3. Installation interface; 4. External connector; 5. Oil pipe; 6. Oil filling interface; 7. Sealed oil tank; 8. Insulating oil; 9. Hydraulic tank. Detailed Implementation

[0017] Reference Figure 1-2 The embodiments of the SCM socket working condition simulation water pressure test device and its control method of the present invention are further described.

[0018] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0019] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0020] Figures 1 to 2 The device shown is a simulated water pressure testing device for an SCM socket, comprising a device body for testing an assembly of an SCM socket and a dry-plug socket, characterized in that: the device body comprises: Watertight test fixture 1: It has a closed oil cavity 2 inside. One side of the watertight test fixture 1 is provided with an installation interface 3 that communicates with the oil cavity 2 and is used to install the assembly. The other side of the watertight test fixture 1 is provided with an external connector 4 that communicates with the oil cavity 2 and is used to connect the oil pipe 5. Oil pipe 5: The oil pipe 5 is configured as a flexible hose; one end of the oil pipe 5 is provided with an oil filling interface 6 for filling with oil, and the other end is sealed to an external connector 4 provided on the watertight test fixture 1; the interior of the oil pipe 5 and the oil cavity 2 form a closed oil chamber 7, the closed oil chamber 7 is filled with insulating oil 8, and the oil pipe 5 is used to automatically adjust the closed oil chamber 7 to balance the water pressure when the water pressure in the pressure tank 9 changes, so that the oil pressure in the oil cavity 2 is consistent with the water pressure in the pressure tank 9; Hydraulic tank 9: It is configured as a sealable pressure tank. The hydraulic tank 9 is used to provide a preset hydraulic environment. The watertight test fixture 1 and the oil pipe 5 can be placed inside the hydraulic tank 9 as a whole. By integrating the watertightness test fixture 1, oil pipe 5, and water pressure tank 9, the actual underwater operating conditions of the SCM socket are accurately reproduced. The sealed oil chamber 7 formed by the sealed oil cavity 2 and the oil pipe 5 is filled with an appropriate amount of insulating oil 8, which can effectively protect the electrical components of the tested assembly and eliminate short circuits and insulation failures during water pressure testing. The installation interface 3 is adapted to the assembly, and the external connector 4 can quickly seal and connect the oil pipe 5. The entire device can be placed inside the sealed and pressure-bearing water pressure tank 9, completely simulating the underwater pressure environment, and testing multiple assemblies simultaneously. Since the oil pipe 5 is set as a flexible hose, it can transmit pressure and thus match the water pressure changes in the water pressure tank 9 in real time, achieving pressure balance. This solves the defect of oil pressure and water pressure imbalance in traditional testing devices, ensuring that the test pressure is highly consistent with the actual operating conditions, and greatly improving the authenticity of the test results. This invention has a simple structure, high integration, low cost, and strong adaptability, and can efficiently complete the watertightness performance testing of assemblies.

[0021] The mounting interface 3 of the watertight test fixture 1 is provided with a sealing ring. The sealing ring is used to seal the connection gap between the assembly and the watertight test fixture 1, and the ratio of the thickness of the sealing ring to the depth of the mounting interface 3 is 1:3-1:5. By optimizing the ratio of the sealing ring thickness to the installation interface 3 depth (1:3-1:5), efficient sealing of the gap between the assembly and the fixture is achieved. This prevents leakage of insulating oil 8 from the sealed oil tank 7 and avoids external water pressure from seeping into the oil cavity 2 and interfering with the test pressure. This ratio design allows the sealing ring to achieve optimal compression deformation. If it is too thick, it will easily cause the assembly to deform and loosen. If it is too thin, the seal will fail. The precise ratio balances sealing performance and assembly accuracy, reducing pressure leakage problems during the test process from the root, ensuring accurate and reliable test data, simplifying product assembly operations, and improving testing efficiency and the long-term stability of the device.

[0022] A control method for an SCM socket operating condition simulation water pressure testing device, characterized by comprising the following steps: S1. Installation of the product under test: Assemble the SCM socket and the dry plug socket into an assembly, and install it on the installation interface 3 of the watertight test fixture 1 by means of threaded connection or snap-fit ​​connection, ensuring that there are no visible gaps in the connection gap; S2. Connection and filling of oil pipe 5: Connect the oil pipe 5 to the external connector 4 of the watertight test fixture 1, connect the micro pump to the oil filling interface 6 and inject an appropriate amount of insulating oil 8 into the oil pipe 5 and the oil cavity 2. After filling, remove the micro pump. S3, Sealing of water pressure tank 9: After the oil filling is completed, put the entire device into the water pressure tank 9, and then close the sealing door of the water pressure tank 9 and lock the sealing door through the locking mechanism; S4. Water pressure loading and balancing: Start the pressurization system of the water pressure tank 9 to gradually increase the water pressure in the water pressure tank 9 to the preset target water pressure at a rate of 0.5-1MPa / min. At the same time, the oil pipe 5 balances the oil pressure in the oil chamber 2 of the watertight test fixture 1 with the water pressure in the water pressure tank 9. During the loading process, record the water pressure value of the water pressure tank 9 and the oil pressure value in the oil chamber 2 of the watertight test fixture 1 every 5 minutes, calculate the difference between the two, and if the difference continues to exceed the set threshold, trigger the alarm mechanism to stop the test and notify the operator. S5. Pressure Holding and Monitoring: When the difference between the oil pressure in the oil chamber 2 of the watertight test fixture 1 and the water pressure in the water pressure tank 9 is <0.1MPa, the pressure holding stage begins. The pressure holding time is set to 30min. During the pressure holding process, the water pressure fluctuation in the water pressure tank 9 and the oil pressure fluctuation in the oil chamber 2 of the watertight test fixture 1 are monitored in real time. If the water pressure fluctuation exceeds ±0.05MPa or the oil pressure fluctuation exceeds ±0.03MPa within 10 consecutive minutes, the system is deemed to have a leakage risk. S6. Leakage check: Observe whether there is oil seepage on the surface of the oil cavity 2 of the watertight test fixture 1, and at the same time check whether there is oil dripping at the connection of the oil pipe 5. If there is oil seepage or dripping, the test is deemed unqualified. If not, proceed to the next step. S7. Pressure relief and sampling: Activate the pressure relief system of the pressure tank 9 to reduce the water pressure inside the pressure tank 9 to normal pressure at a rate of 1-2 MPa / min, open the sealing door of the pressure tank 9, and take out the product to be tested. S8. Appearance and Electrical Testing: Perform an appearance inspection on the removed product to observe whether the assembly has physical damage, deformation, cracks or leakage. Then perform electrical testing, which includes insulation resistance testing and withstand voltage testing. If both tests are qualified, the test is deemed qualified; otherwise, the test is deemed unqualified. This method establishes a standardized, end-to-end hydrostatic testing system for SCM sockets, encompassing product installation, oil filling, sealing, load balancing, pressure monitoring, leak detection, pressure relief sampling, and electrical testing. It features rigorous logic, ease of operation, and a short cycle time, significantly improving testing efficiency. A pressurization rate of 0.5-1 MPa / min and a depressurization rate of 1-2 MPa / min prevent sudden pressure changes from damaging the product. The 30-minute pressure holding time meets industry standards. Combined with pressure monitoring, visual inspection, and electrical testing, it comprehensively assesses product performance. This method minimizes human error, boasts a high degree of automation, accurately simulates underwater conditions, and provides a precise test structure, making it suitable for batch testing and significantly improving testing efficiency while ensuring the safety of products and equipment.

[0023] In S5, the control method for pressure holding and monitoring is as follows: When the pressure holding begins, the reference oil pressure value Pv is set to the oil pressure value of the oil chamber 2 of the watertight test fixture 1, and the reference water pressure value Ps is set to the water pressure value of the water pressure tank 9; The water pressure value P0 of the water pressure tank 9 and the oil pressure value P of the oil chamber 2 of the watertight test fixture 1 are collected in real time, and the oil pressure change rate RP=(P-Pv) / Pv and the water pressure change rate RP0=(P0-Ps) / Ps are calculated. If RP > 0.005 and the duration exceeds 5 minutes, and RP0 > 0.003 and the duration exceeds 5 minutes, it is determined that the system leakage has caused the oil pressure and water pressure to rise synchronously, triggering an alarm and stopping the pressure holding, then proceeding to S6; If RP < -0.005 and the duration exceeds 5 minutes, and RP0 < -0.003 and the duration exceeds 5 minutes, it is determined that there is air intake or oil leakage in the system, causing the oil pressure and water pressure to drop synchronously, triggering an alarm and stopping pressure holding, and proceeding to S6; If |RP|≤0.005, |RP0|≤0.003, but |RP-RP0|>0.002, and the duration exceeds 10 minutes, it is determined that there is a local leak or blockage in the oil chamber 2 of the oil pipe 5 or the watertight test fixture 1, triggering an alarm and switching to S6; If none of the above situations occur, maintain the pressure and continue monitoring; By setting a baseline pressure value and calculating the pressure change rate, this method enables accurate fault identification and graded alarms. It can quickly distinguish between anomalies such as overall leakage, air intake, and local blockage, strictly control fluctuation thresholds, and avoid ineffective pressure holding and fault expansion. This method abandons the drawbacks of traditional single pressure monitoring, and judges local minor faults by the difference in the rate of change, which greatly improves the monitoring accuracy and can detect potential leakage in time, ensuring that the pressure holding data is true and valid. Automated monitoring reduces the error of manual inspection, the judgment criteria are clear, and the accuracy of watertightness test results is effectively improved.

[0024] In step S7, depressurization and sampling include: When the pressure relief system is started, the initial pressure relief rate is set to 1.5 MPa / min. At the same time, the water pressure value P0 in the water pressure tank 9 and the oil pressure value P in the oil chamber 2 of the watertight test fixture 1 are monitored, and the difference ΔP between the two is calculated. If ΔP > 0.2 MPa and lasts for more than 5 seconds, it is determined that the oil circuit balance was disrupted during the pressure relief process, including but not limited to blockage of oil pipe 5; then reduce the pressure relief rate to 0.8 MPa / min until ΔP ≤ 0.2 MPa. If the pressure relief rate is too fast, causing water pressure fluctuations to exceed ±0.1MPa or oil pressure fluctuations to exceed ±0.05MPa for more than 3 seconds, the pressure relief rate is deemed unreasonable. The pressure relief rate is then adjusted to 1MPa / min, and pressure relief continues until the water pressure drops to normal atmospheric pressure. When the water pressure drops to normal pressure, i.e., P0≤0.01MPa and the oil pressure drops to a level close to the water pressure, i.e., P≤0.02MPa, the pressure relief is considered complete, and the sealed door is opened to remove the product being tested. This method achieves intelligent and stable high-pressure relief control, with an initial rate of 1.5 MPa / min balancing efficiency and safety. It monitors the water and oil pressure differences and fluctuations in real time, automatically adjusting the rate to avoid problems such as oil circuit imbalance, valve failure, and oil pipe blockage caused by excessively rapid pressure relief. A clear atmospheric pressure determination standard ensures thorough pressure relief, preventing residual pressure from interfering with product sampling and testing, and protecting the tested assembly and device from impact damage throughout the process. This method offers controllable pressure relief and timely fault response, improving operational safety after high-pressure testing, ensuring the accuracy of subsequent product testing, and adapting to the pressure relief requirements after deep-sea high-pressure simulation. The above description is only a preferred embodiment of the present invention and is not intended to limit the invention. Ordinary changes and substitutions made by those skilled in the art within the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for simulating water pressure testing of an SCM socket under operating conditions, comprising a device body for testing an assembly of an SCM socket and a dry-plug socket, characterized in that: The device body includes: Watertight test fixture (1): It has a closed oil cavity (2) inside. One side of the watertight test fixture (1) is provided with an installation interface (3) that communicates with the oil cavity (2) and is used to install the assembly. The other side of the watertight test fixture (1) is provided with an external connector (4) that communicates with the oil cavity (2) and is used to connect the oil pipe (5). Oil pipe (5): The oil pipe (5) is configured as a flexible hose; one end of the oil pipe (5) is provided with an oil filling interface (6) for filling with oil, and the other end is sealed to an external connector (4) provided on the watertight test fixture (1); the inside of the oil pipe (5) forms a closed oil chamber (7) with the oil cavity (2), and the closed oil chamber (7) is filled with insulating oil (8). The oil pipe (5) is used to automatically adjust the closed oil chamber (7) to balance the water pressure when the water pressure in the pressure tank (9) changes, so that the oil pressure in the oil cavity (2) is consistent with the water pressure in the pressure tank (9); Hydraulic tank (9): It is configured as a sealable pressure tank. The hydraulic tank (9) is used to provide a preset water pressure environment. The watertight test fixture (1) and the oil pipe (5) can be placed inside the hydraulic tank (9) as a whole.

2. The SCM socket operating condition simulation water pressure testing device according to claim 1, characterized in that, The mounting interface (3) of the watertight test fixture (1) is provided with a sealing ring. The sealing ring is used to seal the connection gap between the assembly and the watertight test fixture (1), and the ratio of the thickness of the sealing ring to the depth of the mounting interface (3) is 1:3-1:

5.

3. A control method applicable to the SCM socket operating condition simulation water pressure testing device according to any one of claims 1-2, characterized in that, Includes the following steps: S1. Installation of the product under test: Assemble the SCM socket and the dry plug socket into an assembly, and install it on the installation interface (3) of the watertight test fixture (1) by means of threaded connection or snap-fit ​​connection, ensuring that there are no visible gaps in the connection gap; S2, oil pipe (5) connection and oil filling: connect the oil pipe (5) to the external connector (4) of the watertight test fixture (1), use a micro pump to connect to the oil filling interface (6) and inject an appropriate amount of insulating oil (8) into the oil pipe (5) and the oil cavity (2), and remove the micro pump after the oil filling is completed. S3, Water pressure tank (9) sealing: After the oil filling is completed, put the whole set of equipment into the water pressure tank (9), and then close the sealing door of the water pressure tank (9) and lock the sealing door through the locking mechanism; S4. Water pressure loading and balancing: Start the pressurization system of the water pressure tank (9) to gradually increase the water pressure in the water pressure tank (9) to the preset target water pressure at a rate of 0.5-1MPa / min. At the same time, the oil pipe (5) balances the oil pressure in the oil chamber (2) of the watertight test fixture (1) with the water pressure in the water pressure tank (9). During the loading process, record the water pressure value of the water pressure tank (9) and the oil pressure value of the oil chamber (2) of the watertight test fixture (1) every 5 minutes and calculate the difference between the two. If the difference continues to exceed the set threshold, the alarm mechanism is triggered to stop the test and notify the operator. S5. Pressure Holding and Monitoring: When the difference between the oil pressure in the oil chamber (2) of the watertight test fixture (1) and the water pressure in the water pressure tank (9) is <0.1MPa, the pressure holding stage is entered. The pressure holding time is set to 30min. During the pressure holding process, the water pressure fluctuation in the water pressure tank (9) and the oil pressure fluctuation in the oil chamber (2) of the watertight test fixture (1) are monitored in real time. If the water pressure fluctuation exceeds ±0.05MPa or the oil pressure fluctuation exceeds ±0.03MPa within 10 consecutive minutes, the system is judged to have a leakage risk. S6. Leakage check: Observe whether there is oil seepage on the surface of the oil cavity (2) of the watertight test fixture (1), and at the same time check whether there is oil dripping at the connection of the oil pipe (5). If there is oil seepage or dripping, the test is deemed unqualified. If not, proceed to the next step. S7. Depressurization and Sampling: Start the depressurization system of the pressure tank (9) to reduce the water pressure in the pressure tank (9) to normal pressure at a rate of 1-2 MPa / min, open the sealing door of the pressure tank (9), and take out the product to be tested. S8. Appearance and Electrical Testing: Perform an appearance inspection on the removed product to observe whether the assembly has physical damage, deformation, cracks or leakage. Then perform electrical testing, which includes insulation resistance testing and withstand voltage testing. If both tests are qualified, the test is deemed qualified; otherwise, the test is deemed unqualified.

4. The control method of the SCM socket operating condition simulation water pressure test device according to claim 3, characterized in that, In S5, the control method for pressure holding and monitoring is as follows: When the pressure holding begins, the reference oil pressure value Pv is set to the oil pressure value of the oil chamber (2) of the watertight test fixture (1), and the reference water pressure value Ps is set to the water pressure value of the water pressure tank (9); Real-time acquisition of water pressure value P0 of the water pressure tank (9) and oil pressure value P of oil chamber (2) of watertight test fixture (1), and calculation of oil pressure change rate RP=(P-Pv) / Pv, water pressure change rate RP0=(P0-Ps) / Ps; If RP > 0.005 and the duration exceeds 5 minutes, and RP0 > 0.003 and the duration exceeds 5 minutes, it is determined that the system leakage has caused the oil pressure and water pressure to rise synchronously, triggering an alarm and stopping the pressure holding, then proceeding to S6; If RP < -0.005 and the duration exceeds 5 minutes, and RP0 < -0.003 and the duration exceeds 5 minutes, it is determined that there is air intake or oil leakage in the system, causing the oil pressure and water pressure to drop synchronously, triggering an alarm and stopping pressure holding, and proceeding to S6; If |RP|≤0.005, |RP0|≤0.003, but |RP-RP0|>0.002, and the duration exceeds 10 minutes, it is determined that there is a local leak or blockage in the oil chamber (2) of the oil pipe (5) or the watertight test fixture (1), triggering an alarm and switching to S6; If none of the above situations occur, maintain the pressure and continue monitoring.

5. The control method of the SCM socket operating condition simulation water pressure test device according to claim 3, characterized in that, In step S7, depressurization and sampling include: When the pressure relief system is started, the initial pressure relief rate is set to 1.5 MPa / min. At the same time, the water pressure value P0 in the water pressure tank (9) and the oil pressure value P in the oil chamber (2) of the watertight test fixture (1) are monitored, and the difference ΔP between the two is calculated. If ΔP > 0.2MPa and lasts for more than 5 seconds, it is determined that the oil circuit balance is disrupted during the pressure relief process, including but not limited to the blockage of oil pipe (5); then reduce the pressure relief rate to 0.8MPa / min until ΔP ≤ 0.2MPa; If the pressure relief rate is too fast, causing water pressure fluctuations to exceed ±0.1MPa or oil pressure fluctuations to exceed ±0.05MPa for more than 3 seconds, the pressure relief rate is deemed unreasonable. The pressure relief rate is then adjusted to 1MPa / min, and pressure relief continues until the water pressure drops to normal atmospheric pressure. When the water pressure drops to normal pressure (P0≤0.01MPa) and the oil pressure drops to a level close to the water pressure (P≤0.02MPa), the pressure relief is considered complete, and the sealed door is opened to remove the tested product.

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