Pipeline-type long-period soaking aging evaluation system for simulating deep sea environment

Abstract

The invention discloses a pipeline-type long-period soaking aging evaluation system for a simulated deep sea environment. The system comprises a high-pressure test pipe, a waterway system and a data acquisition unit, the high-pressure testing pipe is a T-shaped three-way pipe, the left end of the high-pressure testing pipe is connected with a left flange cover, the right end is connected with a right flange cover, and the top end is connected with an upper flange cover; a to-be-tested sample is placed in the high-pressure test tube; the waterway system comprises a plunger water pump, a water inlet valve and a water return valve, the water inlet valve is connected to the left flange cover, the water return valve is connected to the upper flange cover, and the plunger water pump is connected with the water inlet valve and the water return valve through pipelines to form a closed loop; the exhaust valve and the back pressure valve are arranged on the upper flange cover; the drain valve is arranged on the lower flange cover; the data acquisition unit comprises a data acquisition unit and a pressure sensor, the pressure sensor is connected to the left flange cover and used for monitoring the pressure of water in the high-pressure test pipe, the pressure sensor is in signal connection with the acquisition unit, and the acquisition unit collects data monitored by the pressure sensor in real time.

Description

Technical Field

[0001] The invention belongs to the technical field of marine test equipment, and in particular relates to a pipeline-type simulated deep-sea environment long-period immersion aging evaluation system. Background Art

[0002] In the field of marine engineering, equipment and instruments for deep-sea diving, resource exploration, and underwater operations operate year-round in ocean environments hundreds or even thousands of meters deep. As ocean depth increases, the seawater pressure these equipment must withstand also increases significantly. A failure can not only damage the equipment but also incur high repair costs. Therefore, before formal commissioning, pressure bearing and sealing reliability tests must be conducted in simulated seawater depths to ensure the equipment's normal operation in the high-pressure deep-sea environment.

[0003] The deep-sea environment is vastly different from land or shallow waters. Its extreme high hydrostatic pressures pose significant challenges to the serviceability of materials and structures. Currently, research into the performance of deep-sea components under high-pressure conditions relies primarily on experimental setups. These devices simulate deep-sea high-pressure conditions, test components, and record their changes under these extreme conditions. This test data is crucial for the development and optimization of deep-sea equipment.

[0004] Existing deep-sea environmental experimental equipment mainly uses the compressibility of fluids to control pressure, thereby achieving high-pressure environment simulation. However, these devices generally have a defect: they cannot simulate the relatively high static pressure environment of the deep sea. This makes it difficult for the experimental results to fully reflect the performance of deep-sea components in a real service environment. In addition, current deep-sea simulation tests mostly use gas pressurization. Due to the compressibility of air, the simulated pressure has low accuracy and poor stability, and the pressurization adjustment is inconvenient. It is accompanied by large noise, which affects the reliability of the experiment and the operating experience. Therefore, these problems limit the accuracy and practicality of deep-sea environmental simulation tests and affect the reliability evaluation of deep-sea equipment. Summary of the Invention

[0005] The present invention provides a pipeline-type simulated deep-sea environment long-period immersion aging evaluation system, which aims to simultaneously simulate the high static pressure environment of seawater to improve the accuracy and practicality of deep-sea environment simulation tests.

[0006] To this end, the present invention adopts the following technical solutions: A pipeline-type simulated deep-sea environment long-term immersion aging evaluation system, including a high-pressure test pipe, a water system, and a data acquisition unit; The high-pressure test tube is a T-shaped three-way tube, the left end of the high-pressure test tube is connected to a left flange cover, the right end is connected to a right flange cover, and the top end is connected to an upper flange cover; the sample to be tested is placed in the high-pressure test tube; The water system includes a plunger water pump, an inlet valve and a return valve. The inlet valve is connected to the left flange cover, and the return valve is connected to the upper flange cover. The plunger water pump is connected to the inlet valve and the return valve through a pipe to form a closed loop; it also includes an exhaust valve and a back pressure valve provided on the upper flange cover, and a drain valve provided on the left flange cover; The data acquisition unit includes a data collector and a pressure sensor. The pressure sensor is connected to the left flange cover and is used to monitor the pressure of the water in the high-pressure test pipe. The pressure sensor is connected to the collector signal, and the collector collects the data monitored by the sensor in real time.

[0007] Furthermore, the data acquisition unit also includes an experiment recording touch screen, which includes a controller, a memory and a display. The controller draws a pressure dynamic curve according to the collected data and outputs it to the display for real-time display.

[0008] Furthermore, it also includes an equipment bracket, and the high-voltage test tube is fixed on the equipment bracket through a tubular clamp.

[0009] Furthermore, it also includes a touch screen bracket, the lower end of the touch screen bracket is connected to the equipment bracket, and the upper end of the touch screen bracket is connected to the experiment recording touch screen.

[0010] Furthermore, it also includes a slot assembly for placing the sample to be tested, the slot assembly includes an upper sample holder and a lower sample holder; a contoured slot matching the shape of the sample to be tested is formed in the slot assembly, and an anti-slip pattern is provided on the inner surface of the slot.

[0011] The design principle of the present invention is: 1. Traditional gas pressurization systems suffer from large pressure fluctuations (±2 MPa) and are unable to simulate liquid hydrostatic pressure. This solution uses a plunger pump in a closed-loop pressurization loop to achieve continuous control from 0 to 22 MPa. A multi-stage pressure balancing structure also suppresses fluctuations to within ±0.05 MPa, significantly improving accuracy compared to traditional methods.

[0012] 2. The leakage rate of traditional flange seals at a pressure of 20MPa is greater than 1mL / min. This solution uses a three-way contact sealing system to significantly reduce the leakage rate. It also uses a pressure-adaptive structure to improve sealing performance with pressure, breaking through the high-pressure sealing bottleneck.

[0013] 3. Traditional fixtures cause plastic deformation of the specimen due to excessive clamping force. This solution achieves tool-free fixation through 3D-printed contoured clamping grooves. It also uses a self-aligning positioning structure to ensure coaxial deviation and make the stress of the clamping contact surface uniform.

[0014] 4. Conventional equipment mostly uses single mechanical protection. This solution is equipped with a 316L stainless steel pipe body with a yield strength ≥310MPa, and can also integrate triple protection of pressure relief and data recording (dual backup architecture) to extend the system life.

[0015] 5. This high-pressure testing device achieves precise, synchronized control of pressure parameters through a modular design. Its multi-level safety protection system ensures equipment reliability under extreme conditions. The combination of an innovative dynamic sealing structure and intelligent fluid control technology enables the system to combine high-precision data acquisition capabilities with industrial-grade safety standards, making it particularly suitable for critical applications such as deep-sea material evaluation and research on the evolution of deep-sea components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the evaluation system of the present invention; Figure 2 yes Figure 1 The main view; Figure 3 yes Figure 1 Left view of; Figure 4 yes Figure 1 Right view; Figure 5 It is a schematic structural diagram of the sample of the present invention; In the figure: 1-pressure sensor, 2-left flange cover, 3-experimental recording touch screen, 4-touch screen bracket, 5-tube fixture, 6-sample and sample holder, 7-high-pressure test tube, 8-safety overflow valve, 9-upper flange cover, 10-right flange cover, 11-plunger water pump, 12-equipment bracket, 13-exhaust valve, 14-return valve, 15-drain valve, 16-water inlet valve, 17-back pressure valve, 18-upper sample holder, 19-lower sample holder, 20-sample. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figure 1-4 As shown, a pipeline-type simulated deep-sea environment long-term immersion aging evaluation system includes four components: an experimental recording touch screen 3, a high-pressure test tube 7, a plunger water pump 11 and an equipment bracket 12.

[0018] The experimental recording touchscreen 3 is rigidly connected to the top of the equipment bracket 12 via an adjustable touchscreen bracket 4. Its built-in data acquisition module establishes a communication connection with the pressure sensor 1 via a shielded data transmission line. The touchscreen is equipped with a self-programmable data recording system that can simultaneously record dynamic pressure curves. It also provides real-time waveform display, data storage, and a USB 3.0 high-speed data interface, supporting real-time monitoring of experimental data and batch export of historical data.

[0019] The high-pressure test tube 7 is made of 316L austenitic stainless steel forged as a whole, and has the characteristics of high-pressure corrosion resistance and stress cracking resistance. The tube body adopts a three-way flange sealing structure: a left flange cover 2 with an axial pressure measuring channel is set on the left side, forming an embedded connection with the pressure sensor 1; an upper flange cover 9 with an integrated safety protection system is configured on the top, with a built-in spring preloaded safety relief valve 8. The valve body is provided with an automatic pressure relief function at a pressure threshold of 22MPa; a right flange cover 10 with a two-way fluid channel is set on the right side, and a split 3D printed sample card slot assembly is embedded in its sample channel, including an upper sample holder 18 and a lower sample holder 19. Figure 5 As shown, the sample holder is made of high-pressure resistant nylon composite material in one piece, and is provided with a contoured slot that matches the sample shape. An axial self-alignment structure is formed by a positioning boss, and an anti-slip pattern is provided on the inner surface of the slot. The radial pressure during the tightening of the flange cover is used to achieve tool-free fixation of the sample.

[0020] Each flange cover is connected to the tube body through eight sets of high-strength alloy nuts. Pre-tightened to a torque of 120 N·m using a digital torque wrench, PTFE gradient sealing rings are placed between the flange joints to form a pressure-compensating sealing system. The right flange cover 10 has a mounting cavity machined into the sample inlet end face, into which the sample holder assembly is inserted with a clearance fit. The axial compression of the flange sealing surface eliminates assembly tolerances, ensuring a coaxial deviation of ≤0.1 mm between the sample centerline and the tube axis.

[0021] The tube body utilizes a four-point dynamic balance fixation scheme, secured orthogonally to the equipment support 12 via four sets of tubular clamps 5 with shock-absorbing pads to ensure axial stability. A dual-channel fluid control system is integrated into the bottom of the tube body, comprising an inlet valve 16 and a return valve 14, each connected to the plunger water pump 11 via a high-pressure metal hose to form a closed-loop connection. The upper flange cover 9 incorporates a multi-stage pressure control module, comprising an exhaust valve 13, a return valve 14, and a back-pressure valve 17, to achieve dynamic balance control of the internal pressure of the tube body. The return valve 14 forms a circulation loop with the plunger pump inlet via a pressure-resistant conduit, forming an environmentally friendly closed-loop treatment system for the experimental medium.

[0022] The specific operation process of this high-voltage measurement experimental system is implemented as follows: first, the sample is installed. The test sample 20 is embedded in the upper sample holder 18 and the lower sample holder 19 of the split 3D printed sample slot assembly according to the contour. The positioning boss is used to achieve axial self-alignment of the sample, and the anti-slip grooves on the inner surface of the slot prevent displacement; open the right flange cover 10 of the high-voltage test tube 7, and use a digital torque wrench to loosen eight groups of high-strength alloy nuts in diagonal order with a torque of 120 N·m; after the slot assembly containing the sample is placed in the installation cavity of the right flange cover 10 with a clearance fit, the nuts are re-tightened in diagonal order, and a pressure self-compensating seal is formed by a polytetrafluoroethylene gradient sealing ring.

[0023] Open the exhaust valve 13 connected to the water inlet valve 16 and the upper flange cover 9, and loosen the back pressure valve 17; start the plunger water pump 11 to inject the medium into the pipe body through the spiral flow channel of the left flange cover 2 to suppress turbulent interference; after the exhaust valve 13 continuously discharges liquid, close it, and increase the pressure in steps to the target pressure (≤20MPa) through the back pressure valve 17. At the same time, the safety relief valve 8 automatically releases the pressure when it reaches 22MPa, and the dynamic equilibrium pressure fluctuation is ≤0.5MPa.

[0024] Pressure sensor 1 transmits the pressure signal in real time via a shielded data transmission line to the experimental recording touchscreen 3, which has a built-in self-programming system to record the dynamic curve. After the experiment, the drain valve 15 and the exhaust valve 13 are opened to drain the residual medium. After the system pressure returns to zero, the right flange cover 10 is disassembled in reverse. The sample is quickly removed using the anti-slip grooves, completing the entire process.

Claims

1. A pipeline-type simulated deep-sea environment long-term immersion aging evaluation system, characterized in that: It includes a high-pressure test tube (7), a water system, and a data acquisition unit; The high-pressure test tube (7) is a T-shaped three-way tube, the left end of the high-pressure test tube (7) is connected to a left flange cover (2), the right end is connected to a right flange cover (10), and the top end is connected to an upper flange cover (9); the sample to be tested is placed in the high-pressure test tube (7); The water system comprises a plunger water pump (11), a water inlet valve (16) and a water return valve (14), wherein the water inlet valve (16) is connected to the left flange cover (2), and the water return valve (14) is connected to the upper flange cover (9), and the plunger water pump (11) is connected to the water inlet valve (16) and the water return valve (14) via a pipeline to form a closed loop; and further comprises an exhaust valve (13) and a back pressure valve (17) provided on the upper flange cover (9), and a drain valve (15) provided on the left flange cover; The data acquisition unit comprises a data collector and a pressure sensor (1). The pressure sensor (1) is connected to the left flange cover (2) and is used to monitor the pressure of the water body in the high-pressure test pipe (7). The pressure sensor (1) is connected to the collector signal, and the collector collects the data monitored by the sensor in real time.

2. The pipeline-type simulated deep-sea environment long-term immersion aging evaluation system according to claim 1 is characterized in that: The data acquisition unit further comprises an experiment recording touch screen (3), which comprises a controller, a memory and a display. The controller draws a pressure dynamic curve according to the collected data and outputs it to the display for real-time display.

3. The pipeline-type simulated deep-sea environment long-term immersion aging evaluation system according to claim 2 is characterized in that: It also includes an equipment bracket (12), and the high-voltage test tube (7) is fixed on the equipment bracket (12) via a tube clamp (5).

4. The pipeline-type simulated deep-sea environment long-term immersion aging evaluation system according to claim 3 is characterized in that: It also includes a touch screen bracket (4), the lower end of the touch screen bracket (4) is connected to the equipment bracket (12), and the upper end of the touch screen bracket (4) is connected to the experiment recording touch screen (3).

5. The pipeline-type simulated deep-sea environment long-term immersion aging evaluation system according to claim 3 is characterized in that: The invention also includes a slot assembly for placing the sample to be tested, the slot assembly includes an upper sample holder (18) and a lower sample holder (19); a contoured slot matching the shape of the sample to be tested is formed in the slot assembly, and an anti-slip pattern is provided on the inner surface of the slot.

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