Integrated self-operated isovolumetric exchange device and control method

Abstract

The invention relates to an integrated self-operated isovolumetric exchange device and a control method. The isometric exchange device comprises a driving cylinder, a main cylinder, an auxiliary cylinder, a main cylinder left liquid inlet one-way valve, a main cylinder right liquid inlet one-way valve, a main cylinder left liquid outlet one-way valve, a main cylinder right liquid outlet one-way valve, an auxiliary cylinder left liquid inlet one-way valve, an auxiliary cylinder right liquid inlet one-way valve, an auxiliary cylinder left liquid outlet one-way valve, an auxiliary cylinder right liquid outlet one-way valve, a driving cylinder pressure reducing valve, a driving cylinder back pressure valve and a main cylinder pressure reducing valve. The system comprises a two-position four-way hydraulic control reversing valve, a driving cylinder left cavity overflow valve, a driving cylinder right cavity overflow valve, a driving cylinder left cavity one-way valve, a driving cylinder right cavity one-way valve, a driving liquid inlet pressure meter, a driving liquid outlet pressure meter and a main cylinder liquid inlet pressure meter. According to the application, a medium drives the cylinder body to mechanically move to realize synchronous, equivalent and reverse flow of main circulating water and replenishing liquid of the cold spring simulation cabin, so that the energy consumption and complexity of the system are effectively reduced, and the working efficiency and reliability are improved.

Description

Technical Field

[0001] This application relates to the technical field of equal-volume exchange devices in marine engineering, and in particular to an integrated self-powered equal-volume exchange device and its control method. Background Technology

[0002] The integrated self-powered equal-volume exchange device is used for water replacement in the land cold spring simulation chamber. The high-pressure water in the main circulation of the cold spring simulation chamber is depressurized and then enters the low-pressure pipeline. After the low-pressure water is degassed, the amount of concentrated brine or fresh water injected needs to be controlled according to the salinity to maintain the salinity of the cold spring simulation chamber water and prevent sudden changes in water salinity from causing cell dehydration or rupture, which could lead to biological stress, death, or drastic changes in community structure.

[0003] Currently, the existing technology of diverting water to regulate salinity and then remixing involves diverting a portion of the water from the main circulation, adjusting the salinity in the bypass regulation module, and then pumping it back into the main circulation. This method requires an additional injection pump and an independent metering and control system, and continuously consumes external energy.

[0004] Therefore, we propose an integrated self-powered equal-volume exchange device and its control method. Summary of the Invention

[0005] To address the shortcomings of existing production technologies, the applicant provides an integrated self-powered equal-volume exchange device and control method. This device directly exchanges water in its original position using only the energy of the mechanical actuator and the main circulating water itself, effectively reducing system energy consumption and complexity, and improving work efficiency and reliability.

[0006] The technical solution adopted in this application is as follows: An integrated self-operated equal-volume exchange device includes a drive cylinder, a main cylinder, an auxiliary cylinder, a main cylinder left inlet check valve, a main cylinder right inlet check valve, a main cylinder left outlet check valve, a main cylinder right outlet check valve, an auxiliary cylinder left inlet check valve, an auxiliary cylinder right inlet check valve, an auxiliary cylinder left outlet check valve, an auxiliary cylinder right outlet check valve, a drive cylinder pressure reducing valve, a drive cylinder back pressure valve, a main cylinder pressure reducing valve, a two-position four-way hydraulic control directional valve, a drive cylinder left chamber overflow valve, a drive cylinder right chamber overflow valve, a drive cylinder left chamber check valve, a drive cylinder right chamber check valve, a drive inlet pressure gauge, a drive outlet pressure gauge, and a main cylinder inlet pressure gauge. The drive cylinder is a double-rod hydraulic cylinder, with the left and right chambers having equivalent areas. The piston rod at one end of the drive cylinder is connected to the piston rod of the main cylinder through a main connecting sleeve, and the piston rod at the other end of the drive cylinder is connected to the piston rod of the auxiliary cylinder through a secondary connecting sleeve. The main cylinder is a double-rod hydraulic cylinder, with the left and right chambers having equivalent areas. The auxiliary cylinder is a double-rod hydraulic cylinder, with the left and right chambers of the auxiliary cylinder and the main cylinder having equivalent areas. The left and right chambers of the main cylinder are connected to the output terminals of the left and right inlet check valves of the main cylinder via pipes, respectively. The input terminals of the left and right inlet check valves of the main cylinder are connected to the same end of the main cylinder inlet pressure gauge via pipes. The other end of the main cylinder inlet pressure gauge is connected to the output terminal of the main cylinder pressure reducing valve. The input terminal of the main cylinder pressure reducing valve is connected to the main liquid inlet via a pipe. The left and right chambers of the main cylinder are connected to the input terminals of the left and right outlet check valves of the main cylinder via pipes, respectively. The output terminals of the left and right outlet check valves of the main cylinder are connected to the main liquid outlet via pipes, respectively. The overflow port of the main cylinder inlet pressure gauge is connected to the auxiliary liquid outlet via a pipe. The left and right chambers of the auxiliary cylinder are connected to the output terminals of the left and right inlet check valves of the auxiliary cylinder through pipes, respectively. The input terminals of the left and right inlet check valves of the auxiliary cylinder are connected to the auxiliary liquid inlet through pipes, respectively. The left and right chambers of the auxiliary cylinder are connected to the input terminals of the left and right outlet check valves of the auxiliary cylinder through pipes, respectively. The output terminals of the left and right outlet check valves of the auxiliary cylinder are connected to the auxiliary liquid outlet through pipes, respectively. The left chamber of the drive cylinder is connected to the input end of the overflow valve of the left chamber of the drive cylinder, the output end of the one-way valve of the left chamber of the drive cylinder, and the working port A of the two-position four-way hydraulic control directional valve through pipes respectively; the output end of the overflow valve of the left chamber of the drive cylinder and the input end of the one-way valve of the left chamber of the drive cylinder are connected to the left input end of the valve core of the two-position four-way hydraulic control directional valve through pipes respectively; the inlet P of the two-position four-way hydraulic control directional valve is connected to the drive inlet pressure gauge and the drive cylinder pressure reducing valve in series through pipes. The right chamber of the drive cylinder is connected to the input end of the right chamber overflow valve, the output end of the right chamber check valve, and the working port B of the two-position four-way hydraulic directional valve via pipes; the output end of the right chamber overflow valve and the input end of the right chamber check valve are connected to the right input end of the valve core of the two-position four-way hydraulic directional valve via pipes; the return port T of the two-position four-way hydraulic directional valve is connected to the drive outlet pressure gauge and the drive cylinder back pressure valve in series via pipes and then to the drive return port; the overflow port of the drive cylinder pressure reducing valve is connected to one end of the drive outlet pressure gauge via a pipe.

[0007] Its further features are: The opening pressure of the left inlet check valve and the right inlet check valve of the auxiliary cylinder is less than or equal to the pressure at the inlet of the auxiliary cylinder; the opening pressure of the left outlet check valve and the right outlet check valve of the auxiliary cylinder is greater than the pressure at the inlet of the auxiliary cylinder.

[0008] The opening pressure of the left inlet check valve of the auxiliary cylinder is less than or equal to the pressure at the inlet of the auxiliary cylinder; the opening pressure of the left outlet check valve of the auxiliary cylinder is greater than the pressure at the inlet of the auxiliary cylinder.

[0009] The opening pressures of the left inlet check valve and the right inlet check valve of the main cylinder are equal; the opening pressures of the left outlet check valve and the right outlet check valve of the main cylinder are equal.

[0010] The opening pressure of the left inlet check valve of the main cylinder is less than or equal to the set pressure of the main cylinder pressure reducing valve, and the opening pressure of the left outlet check valve of the main cylinder is greater than the set pressure of the main cylinder pressure reducing valve.

[0011] The drive cylinder piston rod, main cylinder piston rod, and auxiliary cylinder piston rod are all integral structures.

[0012] The drive cylinder, main cylinder, and auxiliary cylinder are installed concentrically.

[0013] The piston strokes of the drive cylinder, main cylinder, and auxiliary cylinder are equal.

[0014] The effective piston areas of the main cylinder and auxiliary cylinder are equal.

[0015] This application also discloses a control method for an integrated self-powered equal-volume exchange device. Using the aforementioned integrated self-powered equal-volume exchange device, the method includes the following control flow: S1, Power and replenishment fluid input for the equal-volume exchange device: The main circulation high-pressure water inlet of the cold seep simulation chamber is connected to the high-pressure injection pump outlet via a pipeline, and the high-pressure injection pump inlet is connected to the auxiliary liquid outlet via a pipeline; the main circulation high-pressure water outlet of the cold seep simulation chamber is connected to the high-pressure back pressure valve inlet via a pipeline, and the high-pressure back pressure valve outlet is connected to the drive liquid inlet via a pipeline; the drive liquid return port is connected to the degassing module inlet via a pipeline, and the degassing module outlet is connected to the liquid injection inlet via a pipeline. The opening pressures of the main cylinder left inlet check valve and the main cylinder right inlet check valve are both 0.05 MPa; the opening pressures of the main cylinder left outlet check valve and the main cylinder left outlet check valve are both 0.3 MPa; the opening pressures of the auxiliary cylinder left inlet check valve and the auxiliary cylinder right inlet check valve are both 0.05 MPa; the opening pressures of the auxiliary cylinder left outlet check valve and the auxiliary cylinder right outlet check valve are both 0.3 MPa; the set pressure of the drive cylinder pressure reducing valve is 0.9 MPa; the set pressure of the drive cylinder back pressure valve is 0.3 MPa; the set pressure of the main cylinder pressure reducing valve is 0.2 MPa; the opening pressures of the drive cylinder left chamber overflow valve and the drive cylinder right chamber overflow valve are both 0.8 MPa; and the opening pressures of the drive cylinder left chamber check valve and the drive cylinder right chamber check valve are both 0.05 MPa. S2, the piston of the equal-volume exchange device moves to the right during operation: When the two-position four-way hydraulic control directional valve is in the right position, the high-pressure water in the cold spring simulation chamber enters the pressure reducing valve of the drive cylinder through the high-pressure back pressure valve and the drive inlet to be reduced to low-pressure water. The low-pressure water enters the inlet P of the two-position four-way hydraulic control directional valve through the drive inlet pressure gauge, and then flows out from the working port A of the two-position four-way hydraulic control directional valve. The low-pressure water enters the left chamber of the drive cylinder, pushing the piston of the drive cylinder to move to the right. The liquid in the right chamber of the drive cylinder flows into the working port B of the two-position four-way hydraulic control directional valve and flows out from the return port T of the two-position four-way hydraulic control directional valve. It then flows through the drive outlet pressure gauge and the drive cylinder back pressure valve into the drive return port. The piston rod of the drive cylinder drives the piston of the auxiliary cylinder to move to the right through the auxiliary connecting sleeve. The volume of the left chamber of the auxiliary cylinder increases and the volume of the right chamber of the auxiliary cylinder decreases. The replenishment liquid in the auxiliary liquid inlet enters the left chamber of the auxiliary cylinder through the left inlet check valve of the auxiliary cylinder. When the liquid pressure in the right chamber of the auxiliary cylinder reaches the opening pressure of the right outlet check valve of the auxiliary cylinder (0.3 MPa), it flows to the auxiliary liquid outlet. At the same time, the piston rod of the drive cylinder drives the piston of the main cylinder to move to the right through the main connecting sleeve, the volume of the left chamber of the main cylinder increases, and the volume of the right chamber of the main cylinder decreases. The liquid in the drive return port forms degassed low-pressure water after passing through the degassing module. The degassed low-pressure water enters the main cylinder pressure reducing valve through the main liquid inlet and then enters the left chamber of the main cylinder through the main cylinder inlet pressure gauge and the main cylinder left inlet check valve. When the liquid pressure in the right chamber of the main cylinder reaches the opening pressure of the main cylinder right outlet check valve of 0.3MPa, it flows to the main liquid outlet. When the piston of the drive cylinder moves to the right, the pressure between the left chamber of the drive cylinder and the working port A of the two-position four-way hydraulic directional valve continues to increase. When the pressure exceeds the set opening pressure of the relief valve in the left chamber of the drive cylinder (0.8 MPa), the liquid flowing out of the working port A of the two-position four-way hydraulic directional valve flows into the left input end of the valve core of the two-position four-way hydraulic directional valve through the relief valve in the left chamber of the drive cylinder, thereby pushing the valve core of the two-position four-way hydraulic directional valve to move to the right, and the two-position four-way hydraulic directional valve switches to the left position, and the check valve in the left chamber of the drive cylinder opens. S3, the piston of the equal-volume exchange device moves to the left during operation: When the two-position four-way hydraulic control directional valve is in the left position, the high-pressure water in the cold spring simulation chamber enters the pressure reducing valve of the drive cylinder through the high-pressure back pressure valve and the drive inlet to reduce the pressure and become low-pressure water. The low-pressure water enters the inlet P of the two-position four-way hydraulic control directional valve through the drive inlet pressure gauge, and then flows out from the working port B of the two-position four-way hydraulic control directional valve. The low-pressure water enters the right chamber of the drive cylinder, pushing the piston of the drive cylinder to move to the left. The liquid in the left chamber of the drive cylinder flows into the working port A of the two-position four-way hydraulic control directional valve and flows out from the return port T of the two-position four-way hydraulic control directional valve. It then flows through the drive outlet pressure gauge and the drive cylinder back pressure valve into the drive return port. The piston rod of the drive cylinder drives the piston of the auxiliary cylinder to move to the left through the auxiliary connecting sleeve. The volume of the right chamber of the auxiliary cylinder increases and the volume of the left chamber of the auxiliary cylinder decreases. The replenishment liquid in the auxiliary liquid inlet enters the right chamber of the auxiliary cylinder through the right inlet check valve of the auxiliary cylinder. When the liquid pressure in the left chamber of the auxiliary cylinder reaches the opening pressure of the left outlet check valve of the auxiliary cylinder (0.3MPa), it flows to the auxiliary liquid outlet. At the same time, the piston rod of the drive cylinder drives the piston of the main cylinder to move to the left through the main connecting sleeve, the volume of the right chamber of the main cylinder increases, and the volume of the left chamber of the main cylinder decreases. The liquid in the drive return port forms degassed low-pressure water after passing through the degassing module. The degassed low-pressure water enters the main cylinder pressure reducing valve through the main liquid inlet and then enters the right chamber of the main cylinder through the main cylinder inlet pressure gauge and the right inlet check valve of the main cylinder. When the liquid pressure in the left chamber of the main cylinder reaches the opening pressure of the left outlet check valve of the main cylinder (0.3MPa), it flows to the main liquid outlet. When the piston of the drive cylinder moves to the left, the pressure between the right chamber of the drive cylinder and the working port B of the two-position four-way hydraulic directional valve continues to increase. When the pressure exceeds the set opening pressure of the relief valve in the right chamber of the drive cylinder (0.8 MPa), the liquid flowing out of the working port B of the two-position four-way hydraulic directional valve flows into the right input end of the valve core of the two-position four-way hydraulic directional valve through the relief valve in the right chamber of the drive cylinder, thereby pushing the valve core of the two-position four-way hydraulic directional valve to move to the left. After the two-position four-way hydraulic directional valve switches to the right position, the check valve in the right chamber of the drive cylinder opens. S4. Repeat S2 to S3. The equal-volume exchange device synchronously and equally completes the discharge of the main circulating water and the injection of replenishing liquid in the cold spring simulation chamber.

[0016] The beneficial effects of this application are as follows: This application features a compact and reasonable structure, convenient operation, and easier overall integrated operation. Through a uniquely constructed purely mechanical equal-volume exchange and metering system, it achieves synchronous, equal-volume, and reverse flow of the main circulating water and replenishment liquid in the cold spring simulation chamber solely by relying on the medium itself to drive the mechanical movement of the cylinder. This effectively reduces system energy consumption and complexity, and improves working efficiency and reliability.

[0017] In addition, this application also has the following advantages: (1) The drive cylinder, main cylinder, and auxiliary cylinder are all double-rod equal-area hydraulic cylinders. The effective piston area and stroke of the main and auxiliary cylinders are completely consistent. The three cylinders are concentrically installed and the piston rods are rigidly connected as a whole. From a mechanical structure perspective, this ensures that the liquid discharge of the main cylinder and the liquid injection of the auxiliary cylinder are completely synchronized and the delivery volume is absolutely equal. In high-pressure closed environments such as cold spring simulation chambers, zero-deviation exchange of "discharged main circulating water volume = injected replenishment liquid volume" can be achieved, completely avoiding the drastic pressure changes in the chamber caused by flow mismatch in traditional replenishment or discharge systems, and ensuring the pressure stability of the simulation experimental environment and the accuracy of experimental data.

[0018] (2) Relying on the system pressure change after the piston of the drive cylinder reaches the end of the stroke, the reversing action is automatically completed. No independent control system is required throughout the process, which can reduce energy consumption. It also avoids the pain points of easy failure of electronic control components and easy interference of signals under special working conditions such as high pressure, humidity, explosion protection, and deep sea simulation, which greatly reduces the system failure rate and can achieve long-term unattended continuous and stable operation. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the equal-volume exchange device of this application.

[0020] Figure 2 This is a schematic diagram of the operation of the equal-volume exchange device of this application.

[0021] Among them: 2. Main cylinder left inlet check valve; 3. Main cylinder right inlet check valve; 4. Main cylinder left outlet check valve; 5. Main cylinder right outlet check valve; 6. Auxiliary cylinder left inlet check valve; 7. Auxiliary cylinder right inlet check valve; 8. Auxiliary cylinder left outlet check valve; 9. Auxiliary cylinder right outlet check valve; 10. Drive cylinder pressure reducing valve; 11. Drive cylinder back pressure valve; 12. Main cylinder pressure reducing valve; 13. Two-position four-way hydraulic control directional valve; 14. Drive cylinder left chamber overflow valve; 15. Drive cylinder right chamber overflow valve; 16. Left chamber check valve of drive cylinder; 17. Right chamber check valve of drive cylinder; 18. Drive inlet pressure gauge; 19. Drive outlet pressure gauge; 20. Main cylinder inlet pressure gauge; 21. Drive inlet; 22. Drive return port; 23. Main liquid inlet; 24. Main liquid outlet; 25. Auxiliary liquid inlet; 26. Auxiliary liquid outlet; 27. Main connecting sleeve; 28. Auxiliary connecting sleeve; 29. ​​Degassing module; 30. High-pressure injection pump; 31. High-pressure back pressure valve; 32. Cold spring simulation chamber; 101. Drive cylinder; 102. Main cylinder; 103. Auxiliary cylinder. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0028] like Figure 1 , Figure 2As shown, an integrated self-powered equal-volume exchange device includes a drive cylinder 101, a main cylinder 102, and an auxiliary cylinder 103. The drive cylinder 101 is a double-rod hydraulic cylinder, with its left and right chambers having equivalent areas. The piston rod at one end of the drive cylinder 101 is connected to the piston rod of the main cylinder 102 via a main connecting sleeve 27, and the piston rod at the other end of the drive cylinder 101 is connected to the piston rod of the auxiliary cylinder 103 via a secondary connecting sleeve 28. The main cylinder 102 is also a double-rod hydraulic cylinder, with its left and right chambers having equivalent areas. The auxiliary cylinder 103 is also a double-rod hydraulic cylinder, with its left and right chambers having equivalent areas to the main cylinder 102.

[0029] The equal volume exchange device also includes a main cylinder left inlet check valve 2, a main cylinder right inlet check valve 3, a main cylinder left outlet check valve 4, a main cylinder right outlet check valve 5, an auxiliary cylinder left inlet check valve 6, an auxiliary cylinder right inlet check valve 7, an auxiliary cylinder left outlet check valve 8, an auxiliary cylinder right outlet check valve 9, a drive cylinder pressure reducing valve 10, a drive cylinder back pressure valve 11, a main cylinder pressure reducing valve 12, a two-position four-way hydraulic control directional valve 13, a drive cylinder left chamber overflow valve 14, a drive cylinder right chamber overflow valve 15, a drive cylinder left chamber check valve 16, a drive cylinder right chamber check valve 17, a drive inlet pressure gauge 18, a drive outlet pressure gauge 19, and a main cylinder inlet pressure gauge 20; The left and right chambers of the main cylinder 102 are connected to the output terminals of the left inlet check valve 2 and the right inlet check valve 3 of the main cylinder via pipes, respectively. The input terminals of the left inlet check valve 2 and the right inlet check valve 3 of the main cylinder are connected to the same end of the main cylinder inlet pressure gauge 20 via pipes. The other end of the main cylinder inlet pressure gauge 20 is connected to the output terminal of the main cylinder pressure reducing valve 12. The input terminal of the main cylinder pressure reducing valve 12 is connected to the main liquid inlet 23 via a pipe. The left and right chambers of the main cylinder 102 are connected to the input terminals of the left outlet check valve 4 and the right outlet check valve 5 of the main cylinder via pipes, respectively. The output terminals of the left outlet check valve 4 and the right outlet check valve 5 of the main cylinder are connected to the main liquid outlet 24 via pipes, respectively. The overflow port of the main cylinder inlet pressure gauge 20 is connected to the auxiliary liquid outlet 26 via a pipe. The left and right chambers of the auxiliary cylinder 103 are connected to the output end of the left inlet check valve 6 and the output end of the right inlet check valve 7 of the auxiliary cylinder through pipes, respectively. The input end of the left inlet check valve 6 and the input end of the right inlet check valve 7 of the auxiliary cylinder are connected to the auxiliary liquid inlet 25 through pipes, respectively. The left and right chambers of the auxiliary cylinder 103 are connected to the input end of the left outlet check valve 8 and the input end of the right outlet check valve 9 of the auxiliary cylinder through pipes, respectively. The output end of the left outlet check valve 8 and the output end of the right outlet check valve 9 of the auxiliary cylinder are connected to the auxiliary liquid outlet 26 through pipes, respectively. The left chamber of the drive cylinder 101 is connected to the input end of the left chamber overflow valve 14, the output end of the left chamber check valve 16, and the working port A of the two-position four-way hydraulic control directional valve 13 via pipes; the output end of the left chamber overflow valve 14 and the input end of the left chamber check valve 16 are connected to the left input end of the valve core of the two-position four-way hydraulic control directional valve 13 via pipes; the inlet P of the two-position four-way hydraulic control directional valve 13 is connected to the drive inlet pressure gauge 18 and the drive cylinder pressure reducing valve 10 in series via pipes and then to the drive inlet 21. The right chamber of the drive cylinder 101 is connected to the input end of the right chamber overflow valve 15, the output end of the right chamber check valve 17, and the working port B of the two-position four-way hydraulic control directional valve 13 via pipes; the output end of the right chamber overflow valve 15 and the input end of the right chamber check valve 17 are connected to the right input end of the valve core of the two-position four-way hydraulic control directional valve 13 via pipes; the return port T of the two-position four-way hydraulic control directional valve 13 is connected to the drive outlet pressure gauge 19 and the drive cylinder back pressure valve 11 in series via pipes and then to the drive return port 22; the overflow port of the drive cylinder pressure reducing valve 10 is connected to one end of the drive outlet pressure gauge 19 via a pipe. The opening pressures of the auxiliary cylinder left inlet check valve 6 and the auxiliary cylinder right inlet check valve 7 are equal, and the opening pressures of the auxiliary cylinder left outlet check valve 8 and the auxiliary cylinder right outlet check valve 9 are equal.

[0030] The opening pressure of the auxiliary cylinder left inlet check valve 6 and the auxiliary cylinder right inlet check valve 7 is less than or equal to the pressure at the auxiliary cylinder inlet port 25; the opening pressure of the auxiliary cylinder left outlet check valve 8 and the auxiliary cylinder right outlet check valve 9 is greater than the pressure at the auxiliary cylinder inlet port 25.

[0031] The opening pressures of the left inlet check valve 2 and the right inlet check valve 3 of the main cylinder are equal; the opening pressures of the left outlet check valve 4 and the right outlet check valve 5 of the main cylinder are equal.

[0032] The opening pressure of the left inlet check valve 2 and the right inlet check valve 3 of the main cylinder is less than or equal to the set pressure of the main cylinder pressure reducing valve 12, and the opening pressure of the left outlet check valve 4 and the right outlet check valve 5 of the main cylinder is greater than the set pressure of the main cylinder pressure reducing valve 12.

[0033] The piston rods of drive cylinder 101, main cylinder 102, and auxiliary cylinder 103 are all integral structures.

[0034] Drive cylinder 101, main cylinder 102, and auxiliary cylinder 103 are installed concentrically.

[0035] The piston strokes of drive cylinder 101, main cylinder 102, and auxiliary cylinder 103 are equal.

[0036] The effective piston areas of the main cylinder 102 and the auxiliary cylinder 103 are equal.

[0037] The moving speeds of the pistons in drive cylinder 101, main cylinder 102, and auxiliary cylinder 103 can be adjusted by adjusting the opening of the drive cylinder pressure reducing valve 10 and the drive cylinder back pressure valve 11.

[0038] The piston movement direction of drive cylinder 101, main cylinder 102, and auxiliary cylinder 103 is automatically switched and controlled by two-position four-way hydraulic control directional valve 13, drive cylinder left chamber check valve 16, drive cylinder right chamber check valve 17, drive cylinder left chamber overflow valve 14, and drive cylinder right chamber overflow valve 15.

[0039] A control method for an integrated self-powered equal-volume exchange device, using the aforementioned equal-volume exchange device, includes the following control flow: S1, Power and replenishment fluid input for the equal-volume exchange device: The main circulation high-pressure water inlet of the cold seep simulation chamber 32 is connected to the outlet of the high-pressure injection pump 30 via a pipeline, and the inlet of the high-pressure injection pump 30 is connected to the auxiliary liquid outlet 26 via a pipeline; the main circulation high-pressure water outlet of the cold seep simulation chamber 32 is connected to the inlet of the high-pressure back pressure valve 31 via a pipeline, and the outlet of the high-pressure back pressure valve 31 is connected to the drive liquid inlet 21 via a pipeline; the drive liquid return port 22 is connected to the inlet of the degassing module 29 via a pipeline, and the outlet of the degassing module 29 is connected to the liquid injection inlet 23 via a pipeline; The opening pressures of the main cylinder left inlet check valve 2 and the main cylinder right inlet check valve 3 are both 0.05 MPa; the opening pressures of the main cylinder left outlet check valve 4 and the main cylinder left outlet check valve 5 are both 0.3 MPa; the opening pressures of the auxiliary cylinder left inlet check valve 6 and the auxiliary cylinder right inlet check valve 7 are both 0.05 MPa; the opening pressures of the auxiliary cylinder left outlet check valve 8 and the auxiliary cylinder right outlet check valve 9 are both 0.3 MPa; the set pressure of the drive cylinder pressure reducing valve 10 is 0.9 MPa; the set pressure of the drive cylinder back pressure valve 11 is 0.3 MPa; the set pressure of the main cylinder pressure reducing valve 12 is 0.2 MPa; the opening pressures of the drive cylinder left chamber overflow valve 14 and the drive cylinder right chamber overflow valve 15 are both 0.8 MPa; and the opening pressures of the drive cylinder left chamber check valve 16 and the drive cylinder right chamber check valve 17 are both 0.05 MPa. S2, the piston of the equal-volume exchange device moves to the right during operation: When the two-position four-way hydraulic control directional valve 13 is in the right position, the high-pressure water in the cold spring simulation chamber 32 enters the driving cylinder pressure reducing valve 10 through the high-pressure back pressure valve 31 and the driving inlet 21 to reduce pressure and become low-pressure water. The low-pressure water enters the inlet P of the two-position four-way hydraulic control directional valve 13 through the driving inlet pressure gauge 18, and then flows out from the working port A of the two-position four-way hydraulic control directional valve 13. The low-pressure water enters the left chamber of the driving cylinder 101, pushing the piston of the driving cylinder 101 to move to the right. The liquid in the right chamber of the driving cylinder 101 flows into the working port B of the two-position four-way hydraulic control directional valve 13 and flows out from the return port T of the two-position four-way hydraulic control directional valve 13. It then flows through the driving outlet pressure gauge 19 and the driving cylinder back pressure valve 11 to enter the driving return port 22. The piston rod of the drive cylinder 101 drives the piston of the auxiliary cylinder 103 to move to the right through the auxiliary connecting sleeve 28. The volume of the left chamber of the auxiliary cylinder 103 increases and the volume of the right chamber of the auxiliary cylinder 103 decreases. The replenishment liquid in the auxiliary liquid inlet 25 enters the left chamber of the auxiliary cylinder 103 through the auxiliary cylinder left inlet check valve 6. When the liquid pressure in the right chamber of the auxiliary cylinder 103 reaches the opening pressure of the auxiliary cylinder right outlet check valve 9 (0.3 MPa), it flows to the auxiliary liquid outlet 26. Meanwhile, the piston rod of the drive cylinder 101 drives the piston of the main cylinder 102 to move to the right through the main connecting sleeve 27, increasing the volume of the left chamber of the main cylinder 102 and decreasing the volume of the right chamber of the main cylinder 102. The liquid in the drive return port 22 forms degassed low-pressure water after passing through the degassing module 29. The degassed low-pressure water enters the main cylinder pressure reducing valve 12 through the main liquid inlet 23 and is then stabilized before entering the left chamber of the main cylinder 102 through the main cylinder inlet pressure gauge 20 and the main cylinder left inlet check valve 2. When the liquid pressure in the right chamber of the main cylinder 102 reaches the opening pressure of the main cylinder right outlet check valve 5 (0.3 MPa), it flows to the main liquid outlet 24. When the piston of the drive cylinder 101 moves to the right, the pressure between the left chamber of the drive cylinder 101 and the working port A of the two-position four-way hydraulic control valve 13 continues to increase. When the pressure exceeds the set opening pressure of the relief valve 14 in the left chamber of the drive cylinder (0.8 MPa), the liquid flowing out of the working port A of the two-position four-way hydraulic control valve 13 flows into the left input end of the valve core of the two-position four-way hydraulic control valve 13 through the relief valve 14 in the left chamber of the drive cylinder, thereby pushing the valve core of the two-position four-way hydraulic control valve 13 to move to the right. The two-position four-way hydraulic control valve 13 switches to the left position, and the one-way valve 16 in the left chamber of the drive cylinder opens. S3, the piston of the equal-volume exchange device moves to the left during operation: When the two-position four-way hydraulic control directional valve 13 is in the left position, the high-pressure water in the cold spring simulation chamber 32 enters the driving cylinder pressure reducing valve 10 through the high-pressure back pressure valve 31 and the driving inlet 21 to reduce pressure and become low-pressure water. The low-pressure water enters the inlet P of the two-position four-way hydraulic control directional valve 13 through the driving inlet pressure gauge 18, and then flows out from the working port B of the two-position four-way hydraulic control directional valve 13. The low-pressure water enters the right chamber of the driving cylinder 101, pushing the piston of the driving cylinder 101 to move to the left. The liquid in the left chamber of the driving cylinder 101 flows into the working port A of the two-position four-way hydraulic control directional valve 13 and flows out from the return port T of the two-position four-way hydraulic control directional valve 13, and flows through the driving outlet pressure gauge 19 and the driving cylinder back pressure valve 11 to enter the driving return port 22. The piston rod of the drive cylinder 101 drives the piston of the auxiliary cylinder 103 to move to the left through the auxiliary connecting sleeve 28. The volume of the right chamber of the auxiliary cylinder 103 increases and the volume of the left chamber of the auxiliary cylinder 103 decreases. The replenishment liquid in the auxiliary liquid inlet 25 enters the right chamber of the auxiliary cylinder 103 through the auxiliary cylinder right inlet check valve 7. When the liquid pressure in the left chamber of the auxiliary cylinder 103 reaches the opening pressure of the auxiliary cylinder left outlet check valve 8 (0.3 MPa), it flows to the auxiliary liquid outlet 26. Meanwhile, the piston rod of the drive cylinder 101 drives the piston of the main cylinder 102 to move to the left through the main connecting sleeve 27, increasing the volume of the right chamber of the main cylinder 102 and decreasing the volume of the left chamber of the main cylinder 102. The liquid in the drive return port 22 forms degassed low-pressure water after passing through the degassing module 29. The degassed low-pressure water enters the main cylinder pressure reducing valve 12 through the main liquid inlet 23 and is then stabilized before entering the right chamber of the main cylinder 102 through the main cylinder inlet pressure gauge 20 and the main cylinder right inlet check valve 3. When the liquid pressure in the left chamber of the main cylinder 102 reaches the opening pressure of the main cylinder left outlet check valve 4 (0.3 MPa), it flows to the main liquid outlet 24. When the piston of the drive cylinder 101 moves to the left, the pressure between the right chamber of the drive cylinder 101 and the working port B of the two-position four-way hydraulic control valve 13 continues to increase. When the pressure exceeds the set opening pressure of the right chamber overflow valve 15 of the drive cylinder (0.8 MPa), the liquid flowing out of the working port B of the two-position four-way hydraulic control valve 13 flows into the right input end of the valve core of the two-position four-way hydraulic control valve 13 through the right chamber overflow valve 15 of the drive cylinder, thereby pushing the valve core of the two-position four-way hydraulic control valve 13 to move to the left. After the two-position four-way hydraulic control valve 13 switches to the right position, the one-way valve 17 of the right chamber of the drive cylinder opens. S4. Repeat S2 to S3. The equal volume exchange device synchronously and equally completes the discharge of main circulating water and the injection of replenishing liquid in the cold spring simulation chamber 32.

[0040] The above description is an explanation of this application and not a limitation thereof. The scope of this application is defined by the claims. Within the scope of protection of this application, any form of modification may be made.

Claims

1. An integrated self-powered equal-volume exchange device, characterized in that, Includes drive cylinder (101), main cylinder (102), auxiliary cylinder (103), main cylinder left inlet check valve (2), main cylinder right inlet check valve (3), main cylinder left outlet check valve (4), main cylinder right outlet check valve (5), auxiliary cylinder left inlet check valve (6), auxiliary cylinder right inlet check valve (7), auxiliary cylinder left outlet check valve (8), auxiliary cylinder right outlet check valve (9), drive cylinder pressure reducing valve (10), drive cylinder back pressure valve (11), main cylinder pressure reducing valve (12), two-position four-way hydraulic control directional valve (13), drive cylinder left chamber overflow valve (14), drive cylinder right chamber overflow valve (15), drive cylinder left chamber check valve (16), drive cylinder right chamber check valve (17), drive inlet pressure gauge (18), drive outlet pressure gauge (19), and main cylinder inlet pressure gauge (20). The drive cylinder (101) is a double-rod hydraulic cylinder. The left and right chambers of the drive cylinder (101) have equivalent areas. The piston rod at one end of the drive cylinder (101) is connected to the piston rod of the main cylinder (102) through the main connecting sleeve (27). The piston rod at the other end of the drive cylinder (101) is connected to the piston rod of the auxiliary cylinder (103) through the auxiliary connecting sleeve (28). The main cylinder (102) is a double-rod hydraulic cylinder. The left and right chambers of the main cylinder (102) have equivalent areas. The auxiliary cylinder (103) is a double-rod hydraulic cylinder. The left and right chambers of the auxiliary cylinder (103) and the main cylinder (102) have equivalent areas. The left and right chambers of the main cylinder (102) are connected to the output end of the left inlet check valve (2) and the output end of the right inlet check valve (3) of the main cylinder through pipes. The input end of the left inlet check valve (2) and the input end of the right inlet check valve (3) of the main cylinder are connected to the same end of the main cylinder inlet pressure gauge (20) through pipes. The other end of the main cylinder inlet pressure gauge (20) is connected to the output end of the main cylinder pressure reducing valve (12). The input end of the main cylinder pressure reducing valve (12) is connected to the main liquid inlet (23) through pipes. The left and right chambers of the main cylinder (102) are connected to the input end of the left outlet check valve (4) and the input end of the right outlet check valve (5) of the main cylinder through pipes. The output end of the left outlet check valve (4) and the output end of the right outlet check valve (5) of the main cylinder are connected to the main liquid outlet (24) through pipes. The overflow port of the main cylinder inlet pressure gauge (20) is connected to the auxiliary liquid outlet (26) through pipes. The left and right chambers of the auxiliary cylinder (103) are connected to the output end of the left inlet check valve (6) and the output end of the right inlet check valve (7) of the auxiliary cylinder through pipes respectively. The input end of the left inlet check valve (6) and the input end of the right inlet check valve (7) of the auxiliary cylinder are connected to the auxiliary liquid inlet (25) through pipes respectively. The left and right chambers of the auxiliary cylinder (103) are connected to the input end of the left outlet check valve (8) and the input end of the right outlet check valve (9) of the auxiliary cylinder through pipes respectively. The output end of the left outlet check valve (8) and the output end of the right outlet check valve (9) of the auxiliary cylinder are connected to the auxiliary liquid outlet (26) through pipes respectively. The left chamber of the drive cylinder (101) is connected to the input end of the left chamber overflow valve (14), the output end of the left chamber check valve (16), and the working port A of the two-position four-way hydraulic control directional valve (13) through pipes respectively; the output end of the left chamber overflow valve (14) and the input end of the left chamber check valve (16) are connected to the left input end of the valve core of the two-position four-way hydraulic control directional valve (13) through pipes respectively; the inlet P of the two-position four-way hydraulic control directional valve (13) is connected to the drive inlet pressure gauge (18) and the drive cylinder pressure reducing valve (10) in series through pipes and then connected to the drive inlet (21); The right chamber of the drive cylinder (101) is connected to the input end of the right chamber overflow valve (15), the output end of the right chamber check valve (17), and the working port B of the two-position four-way hydraulic control directional valve (13) through pipes; the output end of the right chamber overflow valve (15) and the input end of the right chamber check valve (17) are connected to the right input end of the valve core of the two-position four-way hydraulic control directional valve (13) through pipes; the return port T of the two-position four-way hydraulic control directional valve (13) is connected to the drive outlet pressure gauge (19) and the drive cylinder back pressure valve (11) in series through pipes and then connected to the drive return port (22); the overflow port of the drive cylinder pressure reducing valve (10) is connected to one end of the drive outlet pressure gauge (19) through pipes.

2. The integrated self-powered equal-volume exchange device as described in claim 1, characterized in that: The opening pressure of the auxiliary cylinder left inlet check valve (6) and the auxiliary cylinder right inlet check valve (7) is less than or equal to the pressure of the auxiliary cylinder inlet (25); the opening pressure of the auxiliary cylinder left outlet check valve (8) and the auxiliary cylinder right outlet check valve (9) is greater than the pressure of the auxiliary cylinder inlet (25).

3. The integrated self-powered equal-volume exchange device as described in claim 2, characterized in that: The opening pressure of the left inlet check valve (6) of the auxiliary cylinder is less than or equal to the pressure of the inlet (25) of the auxiliary cylinder; the opening pressure of the left outlet check valve (8) of the auxiliary cylinder is greater than the pressure of the inlet (25) of the auxiliary cylinder.

4. The integrated self-powered equal-volume exchange device as described in claim 1, characterized in that: The opening pressures of the left inlet check valve (2) and the right inlet check valve (3) of the main cylinder are equal; the opening pressures of the left outlet check valve (4) and the right outlet check valve (5) of the main cylinder are equal.

5. The integrated self-powered equal-volume exchange device as described in claim 4, characterized in that: The opening pressure of the left inlet check valve (2) of the main cylinder is less than or equal to the set pressure of the main cylinder pressure reducing valve (12), and the opening pressure of the left outlet check valve (4) of the main cylinder is greater than the set pressure of the main cylinder pressure reducing valve (12).

6. The integrated self-powered equal-volume exchange device as described in claim 1, characterized in that: The piston rods of the drive cylinder (101), the main cylinder (102), and the auxiliary cylinder (103) are all integral structures.

7. The integrated self-powered equal-volume exchange device as described in claim 1, characterized in that: The drive cylinder (101), main cylinder (102), and auxiliary cylinder (103) are installed concentrically.

8. The integrated self-powered equal-volume exchange device as described in claim 1, characterized in that: The piston strokes of the drive cylinder (101), main cylinder (102), and auxiliary cylinder (103) are equal.

9. The integrated self-powered equal-volume exchange device as described in claim 1, characterized in that: The effective piston areas of the main cylinder (102) and the auxiliary cylinder (103) are equal.

10. A control method for an integrated self-powered equal-volume exchange device, using an integrated self-powered equal-volume exchange device as described in any one of claims 1-9, characterized in that, The control flow includes the following: S1, Power and replenishment fluid input for the equal-volume exchange device: The main circulation high-pressure water inlet of the cold spring simulation chamber (32) is connected to the outlet of the high-pressure injection pump (30) through a pipeline, and the inlet of the high-pressure injection pump (30) is connected to the auxiliary liquid outlet (26) through a pipeline; the main circulation high-pressure water outlet of the cold spring simulation chamber (32) is connected to the inlet of the high-pressure back pressure valve (31) through a pipeline, and the outlet of the high-pressure back pressure valve (31) is connected to the drive liquid inlet (21) through a pipeline; the drive liquid return port (22) is connected to the inlet of the degassing module (29) through a pipeline, and the outlet of the degassing module (29) is connected to the liquid injection inlet (23) through a pipeline; The opening pressures of the main cylinder left inlet check valve (2) and the main cylinder right inlet check valve (3) are both 0.05 MPa; the opening pressures of the main cylinder left outlet check valve (4) and the main cylinder left outlet check valve (5) are both 0.3 MPa; the opening pressures of the auxiliary cylinder left inlet check valve (6) and the auxiliary cylinder right inlet check valve (7) are both 0.05 MPa; and the opening pressures of the auxiliary cylinder left outlet check valve (8) and the auxiliary cylinder right outlet check valve (9) are both 0.3 MPa. a. The set pressure of the driving cylinder pressure reducing valve (10) is 0.9MPa, the set pressure of the driving cylinder back pressure valve (11) is 0.3MPa, the set pressure of the main cylinder pressure reducing valve (12) is 0.2MPa, the opening pressure of the driving cylinder left chamber overflow valve (14) and the driving cylinder right chamber overflow valve (15) is 0.8MPa, and the opening pressure of the driving cylinder left chamber check valve (16) and the driving cylinder right chamber check valve (17) is 0.05MPa. S2, the piston of the equal-volume exchange device moves to the right during operation: When the two-position four-way hydraulic control directional valve (13) is in the right position, the high-pressure water from the cold spring simulation chamber (32) enters the driving cylinder pressure reducing valve (10) through the high-pressure back pressure valve (31) and the driving inlet (21) to reduce pressure and become low-pressure water. The low-pressure water enters the inlet P of the two-position four-way hydraulic control directional valve (13) through the driving inlet pressure gauge (18), and then flows out from the working port A of the two-position four-way hydraulic control directional valve (13). The low-pressure water enters the left chamber of the driving cylinder (101), pushing the piston of the driving cylinder (101) to move to the right. The liquid in the right chamber of the driving cylinder (101) flows into the working port B of the two-position four-way hydraulic control directional valve (13) and flows out from the return port T of the two-position four-way hydraulic control directional valve (13). It then flows through the driving outlet pressure gauge (19) and the driving cylinder back pressure valve (11) into the driving return port (22). The piston rod of the drive cylinder (101) drives the piston of the auxiliary cylinder (103) to move to the right through the auxiliary connecting sleeve (28). The volume of the left chamber of the auxiliary cylinder (103) increases, and the volume of the right chamber of the auxiliary cylinder (103) decreases. The replenishment liquid in the auxiliary liquid inlet (25) enters the left chamber of the auxiliary cylinder (103) through the auxiliary cylinder left inlet check valve (6). When the liquid pressure in the right chamber of the auxiliary cylinder (103) reaches the opening pressure of the auxiliary cylinder right outlet check valve (9) of 0.3MPa, it flows to the auxiliary liquid outlet (26). At the same time, the piston rod of the drive cylinder (101) drives the piston of the main cylinder (102) to move to the right through the main connecting sleeve (27), the volume of the left chamber of the main cylinder (102) increases, and the volume of the right chamber of the main cylinder (102) decreases. The liquid in the drive return port (22) forms degassed low-pressure water after passing through the degassing module (29). The degassed low-pressure water enters the main cylinder pressure reducing valve (12) through the main liquid inlet (23) and is stabilized. Then it enters the left chamber of the main cylinder (102) through the main cylinder inlet pressure gauge (20) and the main cylinder left inlet check valve (2). When the liquid pressure in the right chamber of the main cylinder (102) reaches the opening pressure of the main cylinder right outlet check valve (5) of 0.3MPa, it flows to the main liquid outlet (24). When the piston of the drive cylinder (101) moves to the right, the pressure between the left chamber of the drive cylinder (101) and the working port A of the two-position four-way hydraulic control valve (13) continues to increase. When the pressure exceeds the set opening pressure of the relief valve (14) of the left chamber of the drive cylinder (0.8MPa), the liquid flowing out of the working port A of the two-position four-way hydraulic control valve (13) flows into the left input end of the valve core of the two-position four-way hydraulic control valve (13) through the relief valve (14) of the left chamber of the drive cylinder, thereby pushing the valve core of the two-position four-way hydraulic control valve (13) to move to the right, and the two-position four-way hydraulic control valve (13) switches to the left position, and the one-way valve (16) of the left chamber of the drive cylinder opens. S3, the piston of the equal-volume exchange device moves to the left during operation: When the two-position four-way hydraulic control directional valve (13) is in the left position, the high-pressure water from the cold spring simulation chamber (32) enters the driving cylinder pressure reducing valve (10) through the high-pressure back pressure valve (31) and the driving inlet (21) to reduce pressure and become low-pressure water. The low-pressure water enters the inlet P of the two-position four-way hydraulic control directional valve (13) through the driving inlet pressure gauge (18), and then flows out from the working port B of the two-position four-way hydraulic control directional valve (13). The low-pressure water enters the right chamber of the driving cylinder (101), pushing the piston of the driving cylinder (101) to move to the left. The liquid in the left chamber of the driving cylinder (101) flows into the working port A of the two-position four-way hydraulic control directional valve (13) and flows out from the return port T of the two-position four-way hydraulic control directional valve (13), and flows through the driving outlet pressure gauge (19) and the driving cylinder back pressure valve (11) to enter the driving return port (22). The piston rod of the drive cylinder (101) drives the piston of the auxiliary cylinder (103) to move to the left through the auxiliary connecting sleeve (28). The volume of the right chamber of the auxiliary cylinder (103) increases, and the volume of the left chamber of the auxiliary cylinder (103) decreases. The replenishment liquid in the auxiliary liquid inlet (25) enters the right chamber of the auxiliary cylinder (103) through the auxiliary cylinder right inlet check valve (7). When the liquid pressure in the left chamber of the auxiliary cylinder (103) reaches the opening pressure of the auxiliary cylinder left outlet check valve (8) of 0.3MPa, it flows to the auxiliary liquid outlet (26). At the same time, the piston rod of the drive cylinder (101) drives the piston of the main cylinder (102) to move to the left through the main connecting sleeve (27), the volume of the right chamber of the main cylinder (102) increases, and the volume of the left chamber of the main cylinder (102) decreases. The liquid in the drive return port (22) passes through the degassing module (29) to form degassed low-pressure water. The degassed low-pressure water enters the main cylinder pressure reducing valve (12) through the main liquid inlet (23) and is stabilized. Then it enters the right chamber of the main cylinder (102) through the main cylinder inlet pressure gauge (20) and the main cylinder right inlet check valve (3). When the liquid pressure in the left chamber of the main cylinder (102) reaches the opening pressure of the main cylinder left outlet check valve (4) of 0.3MPa, it flows to the main liquid outlet (24). When the piston of the drive cylinder (101) moves to the left, the pressure between the right chamber of the drive cylinder (101) and the working port B of the two-position four-way hydraulic control valve (13) continues to increase. When the pressure exceeds the set opening pressure of the right chamber overflow valve (15) of the drive cylinder (0.8MPa), the liquid flowing out of the working port B of the two-position four-way hydraulic control valve (13) flows into the right input end of the valve core of the two-position four-way hydraulic control valve (13) through the right chamber overflow valve (15) of the drive cylinder, thereby pushing the valve core of the two-position four-way hydraulic control valve (13) to move to the left. After the two-position four-way hydraulic control valve (13) switches to the right position, the one-way valve (17) of the right chamber of the drive cylinder opens. S4. Repeat S2 to S3. The equal volume exchange device synchronously and equally completes the main circulating water discharge and replenishment injection of the cold spring simulation chamber (32).

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