A deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform

Abstract

The present invention relates to the technical field of deep-sea hydraulic reciprocating seals, and discloses a deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform, comprising: a tooling module and a static pressure module; the tooling module comprises a test cylinder, a seawater high-pressure chamber, and a reciprocating drive unit, wherein the test cylinder and the seawater high-pressure chamber are connected, and the reciprocating drive unit is respectively connected to the test cylinder and the seawater high-pressure chamber; the static pressure module comprises an air supply unit, an air drive pump, and an oil supply unit connected in sequence; the air drive pump is respectively connected to the test cylinder and the seawater high-pressure chamber. The present invention can effectively simulate the actual working conditions of deep-sea double-sided high pressure, can study the sealing performance of different system pressures and different marine environments, provides a bushing with a split groove structure, facilitates the disassembly and inspection of the tested seal, and can accurately and efficiently test the performance of various types of sealing rings.

Description

Technical Field

[0001] The present invention relates to the technical field of deep-sea hydraulic reciprocating seals, and in particular to a deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform. Background Art

[0002] Marine resources are an important part of natural resources. Among all kinds of marine resources, the deep seabed, ocean floor and subsoil at depths of 800-5000m contain abundant nodules, crusts, rare earths and other resources. They are the focus of future resource strategies. Deep-sea equipment plays a vital role in the development of these resources. In the process of deep-sea resource development and utilization, deep-sea high-pressure seals are an important foundation for breaking through the deep-sea high-pressure barrier to obtain deep-sea resources. Once the performance of seals fails in deep-sea environments, it will not only affect the completion of deep-sea operations, but may even cause safety hazards. Therefore, it is of great significance to study the sealing performance of seals under deep-sea working conditions. However, the existing sealing performance test equipment for seals is limited to single-sided high-pressure working conditions, and there is no test equipment for double-sided high-pressure working conditions. In addition, seals are generally installed in grooves, and the disassembly of seals generally requires destructive disassembly to remove them, which cannot be used for wear model verification. Summary of the Invention

[0003] In order to solve the problems existing in the background technology, the purpose of the present invention is to propose a deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform. The test platform provided by the present invention can not only simulate the working conditions of deep-sea double-sided high pressure, but also measure the friction force of the test seal and explore the change of friction force over time in reciprocating action, thereby obtaining the full-cycle evolution law of the seal friction performance, and verifying the accuracy of the reciprocating seal wear model through friction force simulation and experimental comparison.

[0004] The embodiment of the present invention provides a deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform, comprising:

[0005] Tooling module and static pressure module;

[0006] The tooling module includes a test cylinder, a seawater high-pressure chamber and a reciprocating drive unit, wherein the test cylinder and the seawater high-pressure chamber are connected, and the reciprocating drive unit is connected to the test cylinder and the seawater high-pressure chamber respectively;

[0007] The static pressure module includes an air supply unit, an air drive pump and an oil supply unit connected in sequence;

[0008] The air drive pump is connected to the test cylinder and the seawater high-pressure chamber respectively.

[0009] Furthermore, the test cylinder includes a test cylinder body, a piston rod and a first bushing, wherein the first bushing is provided on both sides of the test cylinder body, the piston rod passes through the test cylinder body through the first bushing, and a first high-pressure inlet is provided at the bottom of the test cylinder body;

[0010] The first bushing is a split groove structure, including a first split bushing and a second split bushing, and a test seal is provided at the groove formed by the first split bushing and the second split bushing.

[0011] Furthermore, the seawater high-pressure chamber includes a high-pressure chamber cylinder, a compensation rod, and a second bushing, wherein the second bushing is provided on both sides of the high-pressure chamber cylinder, the compensation rod passes through the cylinder wall on one side of the high-pressure chamber cylinder through the second bushing, the cylinder wall on the other side of the high-pressure chamber cylinder is arranged adjacent to and side by side with the test cylinder, and a second high-pressure inlet is provided on the top of the high-pressure chamber cylinder;

[0012] The diameter of the compensation rod is the same as that of the piston rod and is arranged on the same horizontal line;

[0013] A high-pressure cabin seal is provided between the compensation rod and the second bushing.

[0014] Furthermore, the reciprocating drive unit includes a first electric cylinder and a second electric cylinder that reciprocate synchronously, and the first electric cylinder and the second electric cylinder are respectively arranged on both sides of the test cylinder body and the high-pressure chamber cylinder body that are adjacent to each other;

[0015] The first electric cylinder is provided with a first push rod, which is connected to the piston rod through a force sensor. The second electric cylinder is provided with a second push rod, which is connected to the compensation rod.

[0016] Furthermore, the force sensor is connected to the first push rod and the piston rod through a force sensor connecting flange, and the second push rod is connected to the compensation rod through an electric cylinder connecting flange.

[0017] Furthermore, the tooling module also includes a workbench, which is arranged at the bottom of the tooling module, and the test cylinder, the seawater high-pressure chamber, the first electric cylinder and the second electric cylinder are respectively fixed on the workbench through bottom brackets.

[0018] Furthermore, the gas supply unit includes a gas source, a gas circuit switch and a triplex connected in sequence;

[0019] The air drive pump includes a first air drive pump and a second air drive pump;

[0020] The oil supply unit includes an oil tank, and a first oil suction filter and a second oil suction filter respectively connected to the oil tank;

[0021] Among them, the triplex is connected to the first air drive pump and the second air drive pump respectively, the first air drive pump is connected to the first oil suction filter and the test cylinder respectively, and the second air drive pump is connected to the second oil suction filter and the seawater high-pressure chamber respectively.

[0022] Furthermore, the air supply port of the first air drive pump is connected to the oil outlet of the triplex through a first pressure reducing valve, the oil inlet of the first air drive pump is connected to the first oil suction filter, and the oil outlet of the first air drive pump is connected to the first high-pressure inlet at the bottom of the test cylinder body;

[0023] The air supply port of the second air drive pump is connected to the oil outlet of the triplex through a second pressure reducing valve, the oil inlet of the second air drive pump is connected to the second oil suction filter, and the oil outlet of the second air drive pump is connected to the second high-pressure inlet at the top of the high-pressure chamber cylinder.

[0024] Furthermore, a first pressure maintaining switch is provided between the first air drive pump and the test cylinder, a first pressure sensor is provided between the first air drive pump and the first pressure reducing valve, and a first oil suction switch is provided between the first air drive pump and the first oil suction filter;

[0025] A second pressure maintaining switch is provided between the second air drive pump and the seawater high-pressure chamber, a second pressure sensor is provided between the second air drive pump and the second pressure reducing valve, and a second oil suction switch is provided between the second air drive pump and the second oil suction filter.

[0026] Furthermore, the oil supply unit further comprises an oil return filter, the oil return filter is connected to the oil tank, and the oil tank is provided with a liquid level gauge, a breathing filter and an oil drain switch;

[0027] A first pressure relief switch and a third pressure sensor are sequentially arranged between the first pressure maintaining switch and the test cylinder, a second pressure relief switch and a fourth pressure sensor are sequentially arranged between the second pressure maintaining switch and the seawater high-pressure chamber, and the first pressure relief switch and the second pressure relief switch are respectively connected to the return oil filter.

[0028] The present invention provides a deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform. Compared with the existing technology, the present invention can effectively simulate the actual working conditions of deep-sea double-sided high pressure. By adjusting the pressure in the test cylinder and the pressure in the seawater high-pressure chamber, the sealing performance under different system pressures and different marine environments can be studied. In addition, by configuring a compensation rod at the right end of the seawater high-pressure chamber, the first electric cylinder and the second electric cylinder reciprocate synchronously to ensure that the pressure in the seawater high-pressure chamber is constant, and the seawater in the high-pressure chamber is prevented from being squeezed by the piston rod, causing pressure fluctuations in the chamber and causing test deviations. At the same time, the bushing is made into a split groove structure, which facilitates the disassembly and testing of the tested seal, solves the problem that the wear model cannot be verified due to damage when the general seal is disassembled, and can accurately and efficiently test the performance of various types of sealing rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 2 is a schematic structural diagram of a test platform according to an embodiment of the present invention;

[0030] Figure 2 yes Figure 1 Schematic diagram of the structure of the tooling module;

[0031] Figure 3 yes Figure 2 A partial cross-sectional view of the first bushing;

[0032] Figure 4 yes Figure 1 Schematic diagram of the structure of the medium static pressure module. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0034] See also Figure 1 An embodiment of the present invention proposes a deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform, including: a tooling module 100 and a static pressure module 200, wherein the tooling module 100 includes a test cylinder 110, a seawater high-pressure chamber 120 and a reciprocating drive unit 130, and the static pressure module 200 includes an air supply unit, an air drive pump and an oil supply unit. The specific structures of these two modules are described in detail below with reference to the accompanying drawings.

[0035] See also Figure 2The structure of the test cylinder 110 in the tooling module 100 includes a test cylinder body 117, a piston rod 116 and a first bushing. The first bushing is arranged on both sides of the test cylinder body 117. The piston rod 116 crosses the test cylinder body 117 through the first bushing. There is no piston inside the test cylinder body 117. Its cavity is connected and is a single cavity. A first high-pressure inlet 118 is opened on the bottom side of the test cylinder body 117. The cylinder is filled with high-pressure seawater. The static pressure output by the static pressure module 200 can simulate the system pressure in the deep-sea cavity.

[0036] The first bushing of the test cylinder 110 is a split groove structure, including a first split bushing 111 and a second split bushing 112. Figure 3 It can be seen that a groove appears after the first split bushing 111 and the second split bushing 112 are combined. This groove is used to place test seals 114 and 115. The test seals 114 and 115 are respectively placed in the first bushings on both sides of the test cylinder body 117 to test their sealing performance. This split design facilitates the installation and disassembly of the seals, solving the problem that the general seals are damaged when disassembled and cannot be verified for the wear model.

[0037] The seawater high-pressure chamber 120 includes a high-pressure chamber cylinder body 123, a compensation rod 125 and a second bushing 121. The second bushing 121 is arranged on both sides of the high-pressure chamber cylinder body 123. The compensation rod 125 passes through the cylinder wall on one side of the high-pressure chamber cylinder body 123 through the second bushing 121. The cylinder wall on the other side of the high-pressure chamber cylinder body 123 is arranged adjacent to and side by side with the test cylinder body 117 and is connected by threads. A second high-pressure inlet 124 is provided at the top of the high-pressure chamber cylinder body 123. The entire seawater high-pressure chamber cylinder body 123 is a through cavity without a piston. The cavity is filled with high-pressure seawater. The static pressure output by the static pressure module 200 can simulate the external seawater environmental pressure in the deep sea. The compensation rod 125 and the piston rod 116 have the same diameter and are both on the same horizontal line. A high-pressure chamber seal 122 is provided between the compensation rod 125 and the second bushing 121.

[0038] The reciprocating drive unit 130 includes a first electric cylinder 131 and a second electric cylinder 132 that reciprocate synchronously. The first electric cylinder 131 and the second electric cylinder 132 are respectively arranged on both sides of the adjacent test cylinder body 117 and the high-pressure chamber body 123. The first push rod 138 on the first electric cylinder 131 is coaxially connected to one end of the force sensor 134 through the force sensing connecting flange 133. The other end of the force sensor 134 is coaxially connected to the piston rod 116 through the force sensor connecting flange 133. The second push rod 139 on the second electric cylinder 132 is coaxially connected to the compensation rod 125 through the electric cylinder connecting flange 135. The synchronous reciprocating motion of the first electric cylinder 131 and the second electric cylinder 132 can make the compensation rod 125 and the piston rod 116 move synchronously, thereby effectively preventing the reciprocating motion of the piston rod 116 from squeezing the seawater in the seawater high-pressure chamber 120, causing pressure fluctuations in the chamber, and ensuring that the pressure in the seawater high-pressure chamber 120 is constant.

[0039] In order to ensure the stability of the device, a workbench 137 is also set at the bottom of the tooling module 100. The first electric cylinder 131 and the second electric cylinder 132 are fixed to the workbench through the electric cylinder support block 136 at the bottom. The two ends of the test cylinder 110 are fixed to the workbench 137 through the test cylinder support 119, and the two ends of the seawater high-pressure chamber 120 are fixed to the workbench 137 through the high-pressure chamber support 126.

[0040] See also Figure 4 The air supply unit of the static pressure module 200 includes a low-pressure air source 201, an air circuit switch 202 installed at the outlet of the low-pressure air source 201, and a triplet (i.e., an air filter, a pressure reducing valve, and an oil mist collector) 203 connected to the air circuit switch; the air drive pump includes a first air drive pump 208 and a second air drive pump 209; the oil supply unit includes an oil tank 210, a first oil suction filter 214 and a second oil suction filter 215 connected to the oil tank 210, and an oil return filter 224 connected to the oil tank 210.

[0041] The oil outlet of the triplex 203 is connected to the air supply ports of the first and second air drive pumps 208 and 209, respectively, via a first precision pressure reducing valve 204 and a second precision pressure reducing valve 205. A first pressure sensor 206 and a second pressure sensor 207 are installed in the pipelines between the two air drive pumps and the two precision pressure reducing valves. The oil outlets of the first and second oil suction filters 214 and 215 are connected to the oil inlets of the first and second air drive pumps 208 and 209, respectively, via first and second oil suction switches 216 and 217. The oil outlets of the two air drive pumps are connected to the high-pressure inlet 118 of the test cylinder 110 and the high-pressure inlet 124 of the seawater high-pressure chamber 120, respectively, via first and second pressure-maintaining switches 218 and 219. A third pressure sensor 220 and a fourth pressure sensor 221 are installed in the pipelines between the high-pressure inlet 118 and 124 of the test cylinder 110 and the high-pressure inlet 124 of the seawater high-pressure chamber 120, respectively, and the two pressure-maintaining switches. The pressure measurement points are located on the chamber to ensure accurate and reliable measurement data. A first pressure relief switch 222 and a second pressure relief switch 223 are installed on the pipelines between the two pressure-maintaining switches and the two pressure sensors. Both pressure relief switches are connected to the oil inlet of a return oil filter 224. Furthermore, to enhance the safety and stability of the device's operation, a level gauge 212, a breathing filter 213, and an oil drain switch 211 are also installed on the oil tank.

[0042] The static pressure module 200 provided by the present invention can simultaneously provide the intracavity system pressure and the seawater high-pressure chamber pressure required for seal testing, and adopts two sets of independent air-driven pumps to output static pressure respectively, thereby ensuring the pressure stability in the two cavities.

[0043] The following describes the process of the sealing performance test conducted on this platform in conjunction with the specific structure of the above-mentioned test platform. Before conducting the high-pressure sealing performance test based on the test platform provided by the present invention, the static pressure module 200 is first used to adjust the cavity system pressure P required for the seal test. s and seawater hyperbaric chamber pressure P h During the reciprocating motion, the first test seal 114 and the second test seal 115 are installed face to face, one seal is in the outward stroke, and the other seal is in the inward stroke. The value of the force sensor 134 includes the force of the seawater pressure in the seawater high-pressure chamber 120 acting on the piston rod 116 and the friction force between the first test seal 114 and the second test seal 115, as shown in the following formula:

[0044] F=P h ×A0+F1+F2

[0045] Combine Figure 2 It can be seen that F is the value of the force sensor 134, P his the pressure of the seawater high-pressure chamber 120, A0 is the cross-sectional area of ​​the piston rod 116, F1 is the friction force between the first test seal 114 and the piston rod 116, and the first test seal 114 only bears the system pressure P in the test cylinder 110 s , F2 is the friction force between the second test seal 115 and the piston rod 116, and the second test seal 115 is also subjected to the system pressure P s and the hyperbaric chamber pressure P h In other words, the present invention can effectively simulate the actual working conditions of deep-sea double-sided high pressure. By adjusting the pressure in the test cylinder and the pressure in the seawater high-pressure chamber, the sealing performance under different system pressures and different marine environments can be studied. In addition, by configuring a compensation rod at the right end of the seawater high-pressure chamber, the first electric cylinder and the second electric cylinder move back and forth synchronously, ensuring a constant pressure in the seawater high-pressure chamber, and preventing the seawater in the high-pressure chamber from being squeezed by the piston rod, causing pressure fluctuations in the chamber and causing deviations in our test.

[0046] Finally, according to the working conditions of the two seals, the friction forces are calculated respectively using the seal lubrication mechanism model, and the simulated friction force values ​​are compared with the test results to carry out model verification. The specific model verification process can refer to the conventional model verification process and will not be described in detail here.

[0047] Moreover, since the present invention provides a split bushing, the advantages of the split bushing can also be utilized to remove the test seal, obtain the overall wear amount through weighing measurement before and after wear, and compare it with the simulation results obtained by reciprocating seal profile wear detection to verify the accuracy of the constructed wear model. In other words, the test platform of the present invention can be combined with a variety of seal wear test methods to further improve the accuracy of the test.

[0048] In summary, an embodiment of the present invention provides a deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform, comprising: a tooling module and a static pressure module; the tooling module comprises a test cylinder, a seawater high-pressure chamber and a reciprocating drive unit, wherein the test cylinder and the seawater high-pressure chamber are connected, and the reciprocating drive unit is respectively connected to the test cylinder and the seawater high-pressure chamber; the static pressure module comprises an air supply unit, an air drive pump and an oil supply unit connected in sequence; the air drive pump is respectively connected to the test cylinder and the seawater high-pressure chamber. The present invention can effectively simulate the actual working conditions of deep-sea double-sided high pressure, and can study the sealing performance of different system pressures and different marine environments. The compensation rod structure ensures that the pressure in the seawater high-pressure chamber is constant, thereby improving the accuracy of the test. At the same time, a split groove structure bushing is provided to facilitate the disassembly and inspection of the tested seal, solving the problem that the wear model cannot be verified due to the damage of the general seal during disassembly, and can accurately and efficiently test the performance of various types of sealing rings.

[0049] Each embodiment in this specification is described in a progressive manner. The same or similar parts of each embodiment can be directly referenced to each other. Each embodiment focuses on the differences from other embodiments. It should be noted that the technical features of the above embodiments can be combined in any way. To keep the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-described embodiments merely represent several preferred implementations of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art could make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be based on the scope of protection of the claims.

Claims

1. A deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform, characterized by: include: Tooling module and static pressure module; The tooling module includes a test cylinder, a seawater high-pressure chamber and a reciprocating drive unit, wherein the test cylinder and the seawater high-pressure chamber are connected, and the reciprocating drive unit is connected to the test cylinder and the seawater high-pressure chamber respectively; The static pressure module includes an air supply unit, an air drive pump and an oil supply unit connected in sequence; The air drive pump is connected to the test cylinder and the seawater high-pressure chamber respectively; The test cylinder includes a test cylinder body, a piston rod, and a first bushing, wherein the first bushing is provided on both sides of the test cylinder body, the piston rod passes through the test cylinder body through the first bushing, and a first high-pressure inlet is provided at the bottom of the test cylinder body; The first bushing is a split groove structure, including a first split bushing and a second split bushing, and a test seal is provided at the groove formed by the first split bushing and the second split bushing; The seawater high-pressure chamber includes a high-pressure chamber cylinder, a compensation rod, and a second bushing. The second bushing is provided on both sides of the high-pressure chamber cylinder. The compensation rod passes through the cylinder wall on one side of the high-pressure chamber cylinder through the second bushing. The cylinder wall on the other side of the high-pressure chamber cylinder is arranged adjacent to and parallel to the test cylinder. A second high-pressure inlet is provided on the top of the high-pressure chamber cylinder. The diameter of the compensation rod is the same as that of the piston rod and is arranged on the same horizontal line; A high-pressure cabin seal is provided between the compensation rod and the second bushing; The reciprocating drive unit includes a first electric cylinder and a second electric cylinder that reciprocate synchronously, wherein the first electric cylinder and the second electric cylinder are respectively arranged on both sides of the test cylinder body and the high-pressure chamber cylinder body that are adjacent to each other; The first electric cylinder is provided with a first push rod, which is connected to the piston rod through a force sensor. The second electric cylinder is provided with a second push rod, which is connected to the compensation rod.

2. The deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform according to claim 1 is characterized in that: The force sensor is connected to the first push rod and the piston rod through a force sensor connecting flange, and the second push rod is connected to the compensation rod through an electric cylinder connecting flange.

3. The deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform according to claim 1 is characterized in that: The tooling module further includes a workbench, which is arranged at the bottom of the tooling module. The test cylinder, the seawater high-pressure chamber, the first electric cylinder, and the second electric cylinder are respectively fixed to the workbench through bottom brackets.

4. The deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform according to claim 1 is characterized in that: The gas supply unit includes a gas source, a gas circuit switch and a triplex connected in sequence; The air drive pump includes a first air drive pump and a second air drive pump; The oil supply unit includes an oil tank, and a first oil suction filter and a second oil suction filter respectively connected to the oil tank; Among them, the triplex is connected to the first air drive pump and the second air drive pump respectively, the first air drive pump is connected to the first oil suction filter and the test cylinder respectively, and the second air drive pump is connected to the second oil suction filter and the seawater high-pressure chamber respectively.

5. The deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform according to claim 4 is characterized in that: The air supply port of the first air drive pump is connected to the oil outlet of the triplex through a first pressure reducing valve, the oil inlet of the first air drive pump is connected to the first oil suction filter, and the oil outlet of the first air drive pump is connected to the first high-pressure inlet at the bottom of the test cylinder body; The air supply port of the second air drive pump is connected to the oil outlet of the triplex through a second pressure reducing valve, the oil inlet of the second air drive pump is connected to the second oil suction filter, and the oil outlet of the second air drive pump is connected to the second high-pressure inlet at the top of the high-pressure chamber cylinder.

6. The deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform according to claim 5 is characterized in that: A first pressure maintaining switch is provided between the first air drive pump and the test cylinder, a first pressure sensor is provided between the first air drive pump and the first pressure reducing valve, and a first oil suction switch is provided between the first air drive pump and the first oil suction filter; A second pressure maintaining switch is provided between the second air drive pump and the seawater high-pressure chamber, a second pressure sensor is provided between the second air drive pump and the second pressure reducing valve, and a second oil suction switch is provided between the second air drive pump and the second oil suction filter.

7. The deep-sea double-sided high-pressure reciprocating seal friction and wear performance test platform according to claim 6 is characterized in that: The oil supply unit further includes an oil return filter, which is connected to the oil tank. The oil tank is provided with a liquid level gauge, a breathing filter and an oil drain switch. A first pressure relief switch and a third pressure sensor are sequentially arranged between the first pressure maintaining switch and the test cylinder, a second pressure relief switch and a fourth pressure sensor are sequentially arranged between the second pressure maintaining switch and the seawater high-pressure chamber, and the first pressure relief switch and the second pressure relief switch are respectively connected to the return oil filter.

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