A gas-liquid linkage type self-adaptive pressure regulating mechanism

Abstract

The present invention discloses a gas-liquid linkage type adaptive pressure regulating mechanism. The inlet end of the gas-liquid linkage core valve is externally connected to a gas source inlet, and the outlet end of the gas-liquid linkage core valve is respectively connected to one end of two gas-liquid linkage tanks. The other ends of the two gas-liquid linkage tanks are respectively connected to the main hydraulic cylinder body. The gas-liquid linkage core valve is respectively connected to a two-position four-way manual valve. The oil port of the two-position four-way manual valve is connected to the oil port of a two-position three-way solenoid valve through a throttle valve. The handle of the two-position four-way manual valve is connected to a moving piston rod through a mechanical lever. The cylinder piston rod is movably arranged in the main hydraulic cylinder body, and the cylinder piston rod is fixedly connected to the moving piston rod. A compression spring is sleeved on the outer side wall of the cylinder piston rod. A plurality of hydraulic components are movably connected to the moving piston rod. This gas-liquid linkage type adaptive pressure regulating mechanism has a high degree of automation in structure, strong adaptability, and can simultaneously achieve two important functions of gas-liquid conversion and pressure regulation.

Description

Technical Field

[0001] The present invention relates to an adaptive pressure regulating mechanism in the field of natural gas pipeline transportation, and more particularly to a gas-liquid linkage type adaptive pressure regulating mechanism. Background Art

[0002] With the increasing popularity of natural gas in industry and life, the construction of natural gas pipe networks has developed rapidly. Among many pipeline devices, most of the actuators used to control the opening and closing of natural gas pipelines adopt the gas-liquid linkage form, using the existing high-pressure natural gas in the pipeline as the power source, and then converting it into a hydraulic transmission with a larger power density and a more stable output. Finally, hydraulic oil is used as the transmission medium to drive the actuator to perform the on / off valve action.

[0003] Actuators in the form of gas-liquid linkage are widely used in natural gas pipe networks due to the advantages of their own structure. However, due to the large fluctuations in the gas pressure in the natural gas pipeline in actual situations, the time difference required for the actuator to complete the open / close valve task is extremely large under high-pressure and low-pressure conditions. When the gas pressure in the pipeline is low, the actuator takes a long time to complete the open / close valve action. If an emergency occurs at this time, the actuator cannot cut off the natural gas pipeline as soon as possible, increasing the losses caused by the accident. In addition, a large number of pneumatic solenoid valves are used in the gas-liquid linkage actuators on the market, and many actuator failures are caused by the blockage of the pneumatic part solenoid valves due to the deposition of impurity particles in the natural gas. Summary of the Invention

[0004] In order to solve the problems in the background art, the present invention provides a gas-liquid linkage type adaptive pressure regulating mechanism that does not use any pneumatic solenoid valves and can adaptively adjust the output pressure while realizing gas-liquid conversion, improving the working efficiency of the gas-liquid linkage actuators on natural gas pipelines.

[0005] To achieve the above functional requirements, the present invention adopts the following technical solutions:

[0006] It includes a gas-liquid linkage core valve, a gas-liquid linkage tank, a two-position four-way manual valve, a throttle valve, a two-position three-way solenoid valve, a main hydraulic cylinder block, a compression spring, a cylinder piston rod, a moving piston rod, a fuel tank, an accumulator, an actuator, and a controller;

[0007] The inlet end of the gas-liquid linkage core valve is externally connected to the gas source inlet. The outlet end of the gas-liquid linkage core valve is respectively connected to one end of two gas-liquid linkage tanks. The other ends of the two gas-liquid linkage tanks are respectively communicated with the two end oil cavities of the main hydraulic cylinder block. The gas-liquid linkage core valve is respectively connected to oil port A and oil port B of the two-way four-port manual valve. The oil inlet port P of the two-way four-port manual valve is connected to the oil inlet port P of the two-way three-port solenoid valve through a throttle valve. The oil return port T of the two-way four-port manual valve is externally connected to the oil tank. The handle of the two-way four-port manual valve is connected to a moving piston rod through a mechanical lever. The main hydraulic cylinder block is located between the two moving piston rods. The cylinder piston rod is arranged in the main hydraulic cylinder block so as to be able to move back and forth along its own axis, and both ends of the cylinder piston rod extend out of the openings on both sides of the main hydraulic cylinder block. Both ends of the cylinder piston rod are respectively fixedly connected to the two moving piston rods. A compression spring is sleeved on the outer side wall of the cylinder piston rod. A number of hydraulic components are arranged at the position between the two moving piston rods, and each hydraulic component is movably connected to the moving piston rod through a cylinder piston rod;

[0008] The oil port B of the two-way three-port solenoid valve is externally connected to the oil tank. The electromagnetic end of the two-way three-port solenoid valve is electrically connected to the controller. The oil port A of the two-way three-port solenoid valve is respectively connected to the hydraulic component, the accumulator and the actuator. The hydraulic component is respectively connected to the accumulator, the actuator and the controller.

[0009] The gas-liquid linkage core valve described above includes a filter, a pressure sensor, a two-way three-port pilot-operated valve, a check valve and a core valve body; the filter, the pressure sensor, the two-way three-port pilot-operated valve and the check valve are all arranged inside the core valve body. The oil port A between the two two-way three-port pilot-operated valves is connected through a first pipeline. The oil port B between the two two-way three-port pilot-operated valves is connected through a second pipeline. The oil port P of the two two-way three-port pilot-operated valves is respectively connected to the two gas-liquid linkage tanks. The two two-way three-port pilot-operated valves are respectively connected to the two oil ports of the two-way four-port manual valve. The inlet end of the filter is externally connected to the gas source inlet, and the outlet end of the filter is communicated with the first pipeline. A pressure sensor and a check valve are respectively arranged on the first pipeline and the second pipeline.

[0010] The hydraulic component described above includes an oil cylinder control valve, a hydraulic oil cylinder block, a suction check valve and a discharge check valve. The inlet of the hydraulic oil cylinder block is connected to the oil tank through the suction check valve. The outlet of the hydraulic oil cylinder block is connected to the oil inlet port P of the oil cylinder control valve through the discharge check valve. The oil port A of the oil cylinder control valve is respectively connected to the oil port A of the two-way three-port solenoid valve, the accumulator and the actuator. The oil port B of the oil cylinder control valve is externally connected to the oil tank. The electromagnetic end of the oil cylinder control valve is electrically connected to the controller;

[0011] The hydraulic cylinder block is located between two moving piston rods. The cylinder block piston rod is arranged in the hydraulic cylinder block so that it can move back and forth along its own axis, and both ends of the cylinder block piston rod extend out of the openings on both sides of the hydraulic cylinder block. The two ends of the cylinder block piston rod are respectively fixedly connected to the two moving piston rods.

[0012] The compression spring is located outside the main hydraulic cylinder block and sleeved on the cylinder rod. One end of the compression spring is fixedly connected to the moving piston rod, and the other end is fixedly connected to one side of the main hydraulic cylinder block.

[0013] The oil port A of the two-position four-way manual valve is connected to the control oil port of a two-position three-way hydraulic control valve, and the oil port B of the two-position four-way manual valve is connected to the control oil port of another two-position three-way hydraulic control valve.

[0014] The main hydraulic cylinder block adopts a double-axis hydraulic cylinder.

[0015] The gas-liquid linkage core valve is a cartridge valve. All hydraulic components in the valve are inserted on the core valve body. In the gas-liquid linkage core valve, the normal position of the two-position three-way hydraulic control valve is that the oil inlet P and the oil port B are connected.

[0016] The accumulator has a certain pre-charge pressure inside, and provides pilot pressure oil for the gas-liquid linkage core valve when the pressure regulating mechanism is started for the first time.

[0017] The input medium of the gas-liquid linkage tank is filtered natural gas, and the output medium is hydraulic oil.

[0018] The throttling effect of the throttle valve needs to be manually adjusted according to the actual situation.

[0019] The moving piston rod, the cylinder rod and the cylinder block piston rod form a piston rod group. The cylinder rod is fixedly connected to the moving piston rod, and the movement of the cylinder rod can drive the piston rod group to move synchronously.

[0020] The normal position of the two-position three-way solenoid valve is the position where the oil port P and the oil port B are connected.

[0021] The handle of the two-position four-way manual valve is connected to the piston rod group through a mechanical lever. When the piston rod group moves to the left or right maximum displacement along with the piston rod, the two-position four-way manual valve will be switched to another working position.

[0022] The cylinder control valve is a two-position three-way solenoid valve, and its normal position is the position where the oil port P and the oil port B are connected.

[0023] There are a total of n hydraulic cylinder barrels, and the piston areas of each cylinder are different. The specific number of hydraulic cylinder barrels and the piston areas are determined by the actual working conditions. Different combinations of hydraulic cylinder barrels form different hydraulic cylinder groups. Suppose there are 2 hydraulic cylinders numbered A1 and A2 respectively, and the piston areas are taken as a and 2a respectively, then the total piston area is 3a. By combining different hydraulic cylinder barrels, the equivalent piston area of the hydraulic cylinder group can vary arbitrarily in multiples of a within the range of a - 3a.

[0024] In the described hydraulic cylinder barrel, the oil suction ports of the left and right chambers are connected to the oil tank through oil suction check valves, and the oil discharge ports are connected to each other through oil discharge check valves and then jointly connected to the oil inlet P of the oil cylinder control valve.

[0025] The described controller is a digital controller used to control each solenoid valve. According to the feedback signal of the pressure sensor, the controller determines the start and stop of the pressure regulating mechanism and the magnification of pressure amplification by controlling the solenoid valve.

[0026] In the present invention, the gas-liquid linkage tank converts the input pressure gas into an isobaric liquid; the controller automatically selects different hydraulic cylinder groups according to the pressure of the input gas. Different combinations of hydraulic cylinder barrels amplify the input pressure and then output it, so that the output pressure can vary in multiple levels; the gas-liquid linkage core valve realizes the switching of the air flow circuit along with the movement of the piston rod group, enabling the main hydraulic cylinder to act alternately left and right, so that the gas-liquid linkage tank does not need to replenish oil. This gas-liquid linkage type of adaptive pressure regulating mechanism has a high degree of automation and strong adaptability. It can simultaneously realize two important functions of gas-liquid conversion and pressure regulation, and the pressure regulation can also automatically select different hydraulic cylinder groups according to the pressure fluctuation of the input gas to control the output pressure range. In practical applications, double-acting hydraulic cylinder groups with different pressure regulation ranges and pressure regulation accuracies can be designed according to different working conditions, which has practical engineering significance of being easy to integrate and process.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. The present invention is a gas-liquid linkage type of adaptive pressure regulating mechanism, which can simultaneously realize gas-liquid conversion and pressure increase.

[0029] 2. The present invention can improve the adaptability of the pressure regulating mechanism by increasing the types and quantities of hydraulic cylinders, so that natural gas gases with different pressures can obtain appropriate pressure amplification after passing through the pressure regulating mechanism, and the output pressure of the pressure regulating mechanism can be maximally matched with the external load.

[0030] 3. The present invention can realize multi-level adjustment of output pressure. The maximum pressure amplification factor is the ratio of the equivalent piston area of ​​the main hydraulic cylinder to the smallest equivalent piston area in the hydraulic cylinder, and the minimum pressure amplification factor is the ratio of the equivalent piston area of ​​the main hydraulic cylinder to the largest equivalent piston area in the hydraulic cylinder.

[0031] 4. The present invention converts the gas source pressure into liquid pressure in advance through a clever design, so that the present invention and the actuator parts that need to be connected in actual use do not need to use pneumatic solenoid valves, completely eliminating the failure caused by the blockage of the pneumatic solenoid valve, and can greatly reduce the failure rate of the actuator that controls the opening and closing of the natural gas pipeline using the present invention. In addition, since hydraulic oil is still cleaner and has better lubricity than filtered natural gas, the maintenance required for the equipment using the present invention will also be greatly reduced, which can save labor.

[0032] 5. The present invention adopts digital control, has a high degree of automation and a fast response speed, and is suitable for natural gas pipelines that require rapid response of equipment in emergency situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the gas-liquid linkage type adaptive pressure regulating mechanism.

[0034] Figure 2 It is a schematic diagram of the internal structure of the gas-liquid linkage core valve.

[0035] Figure 3 It is a schematic diagram of air intake from one side when the gas-liquid linkage type adaptive pressure regulating mechanism is in working state.

[0036] Figure 4 It is a schematic diagram of air intake from the other side when the gas-liquid linkage type adaptive pressure regulating mechanism is in working state.

[0037] In the figure: 1. Gas-liquid linkage core valve; 2. Gas-liquid linkage tank; 3. Two-position four-way manual valve; 4. Throttle valve; 5. Two-position three-way solenoid valve; 6. Main hydraulic cylinder body; 7. Compression spring; 8. Cylinder piston rod; 9. Moving piston rod; 10. Cylinder control valve; 11. Hydraulic cylinder body; 12. Oil suction check valve; 13. Oil discharge check valve; 14. Oil tank; 15. Accumulator; 16. Actuator; 17. Controller; 1-1. Filter; 1-2. Pressure sensor; 1-3. Two-position three-way hydraulic control valve; 1-4. Check valve; 1-5. Core valve body. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] like Figure 1As shown in the figure, it includes a gas-liquid linkage core valve 1, a gas-liquid linkage tank 2, a two-position four-way manual valve 3, a throttle valve 4, a two-position three-way solenoid valve 5, a main hydraulic cylinder block 6, a compression spring 7, a cylinder piston rod 8, a moving piston rod 9, a fuel tank 14, an accumulator 15, an actuator 16 and a controller 17;

[0040] The inlet end of the gas-liquid linkage core valve 1 is externally connected to a gas source inlet. The outlet end of the gas-liquid linkage core valve 1 is respectively connected to one end of two gas-liquid linkage tanks 2. The other ends of the two gas-liquid linkage tanks 2 are respectively communicated with the oil cavities at both ends of the main hydraulic cylinder block 6. The gas-liquid linkage core valve 1 is respectively connected to the oil ports A and B of the two-position four-way manual valve 3. The oil port P of the two-position four-way manual valve 3 is connected to the oil port P of the two-position three-way solenoid valve 5 through the throttle valve 4. The oil port T of the two-position four-way manual valve 3 is externally connected to the fuel tank 14. The handle of the two-position four-way manual valve 3 is connected to a moving piston rod 9 through a mechanical lever. The main hydraulic cylinder block 6 is located between the two moving piston rods 9. The cylinder piston rod 8 is arranged in the main hydraulic cylinder block 6 so as to be able to move back and forth along its own axis, and both ends of the cylinder piston rod 8 extend out of the openings on both sides of the main hydraulic cylinder block 6. Both ends of the cylinder piston rod 8 are respectively fixedly connected to the two moving piston rods 9. That is, ports are provided on both sides of the main hydraulic cylinder block 6. Both ends of the cylinder piston rod 8 respectively pass through the ports on both sides of the main hydraulic cylinder block 6 and are respectively fixedly connected to the two moving piston rods 9. A compression spring 7 is sleeved on the outer side wall of the cylinder piston rod 8. A number of hydraulic components are arranged at the position between the two moving piston rods 9, and each hydraulic component is movably connected to the moving piston rod 9 through a cylinder piston rod;

[0041] The oil port B of the two-position three-way solenoid valve 5 is externally connected to the fuel tank 14. The electromagnetic end of the two-position three-way solenoid valve 5 is electrically connected to the controller 17. The oil port A of the two-position three-way solenoid valve 5 is respectively connected to the hydraulic component, the accumulator 15 and the actuator 16. The hydraulic component is respectively connected to the accumulator 15, the actuator 16 and the controller 17.

[0042] As Figure 2As shown in the figure, the gas-liquid linkage core valve 1 includes a filter 1-1, a pressure sensor 1-2, a two-position three-way hydraulic control valve 1-3, a check valve 1-4, and a core valve body 1-5; the filter 1-1, the pressure sensor 1-2, the two-position three-way hydraulic control valve 1-3, and the check valve 1-4 are all arranged inside the core valve body 1-5. The oil ports A of the two two-position three-way hydraulic control valves 1-3 are connected by a first pipeline, the oil ports B of the two two-position three-way hydraulic control valves 1-3 are connected by a second pipeline, the oil ports P of the two two-position three-way hydraulic control valves 1-3 are respectively connected to two gas-liquid linkage tanks 2, the two two-position three-way hydraulic control valves 1-3 are respectively connected to two oil ports of a two-position four-way manual valve 3. The inlet end of the filter 1-1 is externally connected to a gas source inlet, and the outlet end of the filter 1-1 is communicated with the first pipeline. A pressure sensor 1-2 and a check valve 1-4 are respectively arranged on the first pipeline and the second pipeline.

[0043] The hydraulic component includes an oil cylinder control valve 10, a hydraulic oil cylinder body 11, a suction check valve 12, and a discharge check valve 13. The inlet of the hydraulic oil cylinder body 11 is connected to a fuel tank 14 through the suction check valve 12, and the outlet of the hydraulic oil cylinder body 11 is connected to the oil inlet P of the oil cylinder control valve 10 through the discharge check valve 13. The oil port A of the oil cylinder control valve 10 is respectively connected to the oil port A of a two-position three-way solenoid valve 5, an accumulator 15, and an actuator 16. The oil port B of the oil cylinder control valve 10 is externally connected to the fuel tank 14, and the electromagnetic end of the oil cylinder control valve 10 is electrically connected to a controller 17.

[0044] The hydraulic oil cylinder body 11 is located between two moving piston rods 9. The cylinder piston rod is arranged in the hydraulic oil cylinder body 11 so that it can move back and forth along its own axis, and both ends of the cylinder piston rod extend out of the openings on both sides of the hydraulic oil cylinder body 11. Both ends of the cylinder piston rod are respectively fixedly connected to the two moving piston rods 9, that is, there are ports on both sides of the hydraulic oil cylinder body 11, and both ends of the cylinder piston rod respectively pass through the ports on both sides of the hydraulic oil cylinder body 11 and are respectively fixedly connected to the two moving piston rods 9.

[0045] The compression spring 7 is located outside the main hydraulic oil cylinder body 6 and sleeved on the oil cylinder piston rod 8. One end of the compression spring 7 is fixedly connected to the moving piston rod 9, and the other end of the compression spring 7 is fixedly connected to one side of the main hydraulic oil cylinder body 6. The compression spring 7 is used to improve the response speed of the oil cylinder piston rod 8.

[0046] The oil port A of the two-position four-way manual valve 3 is connected to the control oil port of a two-position three-way hydraulic control valve 1-3, and the oil port B of the two-position four-way manual valve 3 is connected to the control oil port of the other two-position three-way hydraulic control valve 1-3.

[0047] The main hydraulic oil cylinder body 6 adopts a double-axis hydraulic oil cylinder.

[0048] The oil output ends of two gas-liquid linkage tanks 2 with the same characteristics are respectively connected to the left and right oil chambers of the main hydraulic cylinder block 6. When the main hydraulic cylinder block 6 is initially started, the cylinder piston rod 8 should be located at the end on either side.

[0049] The moving piston rod 9, the cylinder piston rod 8 and the cylinder block piston rod form a piston rod group. The function of the gas-liquid linkage core valve 1 is to switch the air flow circuit with the movement of the piston rod group under the cooperation of the two-position four-way manual valve 3, so that the main hydraulic cylinder block 6 can act alternately left and right, so that the gas-liquid linkage tank 2 does not need to be refueled. The gas-liquid linkage core valve 1 has a total of six ports, one port is connected to the air source, one port leads to the air, two ports are pilot oil ports, and two ports are connected to the gas-liquid linkage tank 2. The handle of the two-position four-way manual valve 3 is connected to the moving piston rod 9 through a mechanical lever. When the moving piston rod 9 moves to the maximum displacement on the left or right with the cylinder piston rod 8, the two-position four-way manual valve 3 will be switched to another working position.

[0050] By increasing the type and quantity of the hydraulic cylinder block 11, the pressure regulation accuracy of the mechanism can be improved and the pressure regulation range can be expanded.

[0051] In the specific implementation, the accumulator 15 has a certain pre-charge pressure. Since the normal position state of the gas-liquid linkage core valve 1 is the air circuit closed state, that is, both two-position three-way hydraulic control valves 1-3 inside the gas-liquid linkage core valve 1 are in the state where the oil port A is closed and the oil port P is connected to the oil port B, so when the pressure regulating mechanism is initially started without output, the accumulator 15 provides the pilot oil to open the air circuit of the gas-liquid linkage core valve 1, that is, the oil port P of the two-position three-way hydraulic control valve 1-3 is connected to the oil port A.

[0052] When the natural gas passes through the gas-liquid linkage core valve 1 for filtration and then flows to the gas-liquid linkage tank 2, the gas-liquid linkage tank 2 converts the pressure gas into pressure oil with the same pressure. The pressure oil drives the cylinder piston rod 8 in the main hydraulic cylinder block 6 to drive the piston rod 8 and the cylinder block piston rod on the entire piston rod group to move synchronously. With the cooperation of the controller 17, the oil cylinder control valve 10 opens, and finally the hydraulic cylinder block 11 outputs the pressure oil after pressure regulation. The pressure oil after pressure regulation flows to the actuator 16, the accumulator 15 and the gas-liquid linkage core valve 1 respectively; flowing to the actuator 16 can directly drive the actuator to act; flowing to the accumulator 15 can store energy, and when other parts of the pressure regulating mechanism fail, it can also drive the actuator 16 to act in an emergency to provide reliability guarantee; and a small part flows to the gas-liquid linkage core valve 1 through the two-position three-way solenoid valve 5, the throttle valve 4 and the two-position four-way manual valve 3 that are conducted under the action of the controller 17 as the pilot oil to open another air circuit of the gas-liquid linkage core valve 1, so that the main hydraulic cylinder block 6 acts alternately left and right, and the pressure regulation process can be repeated.

[0053] The two gas outlets of the gas-liquid linkage core valve 1 are respectively connected to the inlet ends of two gas-liquid linkage tanks 2 with the same parameters such as model size. The outlets of the two gas-liquid linkage tanks 2 are respectively connected to the left and right oil chambers of the main hydraulic cylinder block 6, so that the total amount of liquid in the two gas-liquid linkage tanks 2 and the main hydraulic cylinder block 6 always remains unchanged, and the oil only flows back and forth between them.

[0054] Compression springs 7 are installed at both ends of the main hydraulic cylinder block 6. The compression springs 7 can improve the response speed of the piston rod 8 and make the piston rod 8 automatically return to the middle position in the non-pressure state.

[0055] The moving piston rod 9 connects the cylinder piston rod 8 of the main hydraulic cylinder block 6 and the cylinder piston rod of the hydraulic cylinder block 11. When hydraulic oil enters the main hydraulic cylinder block 6 and makes the cylinder piston rod 8 of the main hydraulic cylinder block 6 move left and right, under the action of the moving piston rod 9, the cylinder piston rods matching the respective hydraulic cylinder blocks 11 will all move synchronously, so that the hydraulic oil in each hydraulic cylinder block 11 outputs hydraulic oil with a changed pressure after passing through the oil discharge check valve 13 and the oil cylinder control valve 10.

[0056] In addition, the moving piston rod 9 and the handle of the two-position four-way manual valve 3 are connected by a mechanical lever. The movement of the moving piston rod 9 is transmitted to the handle of the two-position four-way manual valve 3 through the mechanical lever, so as to realize the alternating operation of the two gas-liquid linkage tanks 2, so that the hydraulic oil in the gas-liquid linkage tanks 2 and the main hydraulic cylinder block 6 does not need to be replenished and flows back and forth in the two chambers of the two gas-liquid linkage tanks 2 and the corresponding main hydraulic cylinder block 6. When the moving piston rod 9 on the left side of the main hydraulic cylinder block 6 moves to the rightmost side along with the cylinder piston rod 8, the two-position four-way manual valve 3 will be switched to the state where the oil port AP is connected and the oil port TB is connected; on the contrary, when the moving piston rod 9 moves to the leftmost side along with the piston rod 8, the two-position four-way manual valve 3 will be switched to the state where the oil port AT is connected and the oil port PB is connected.

[0057] Both chambers of each hydraulic cylinder block 11 can suck oil from the low-pressure oil tank 14 through the oil suction check valve 12, and at the same time are also connected to an oil cylinder control valve 10 through the oil discharge check valve 13. The oil cylinder control valve 10 is used to control whether the hydraulic cylinder block 11 outputs pressure. When it is necessary for the hydraulic cylinder block 11 to be in the working state, that is, the hydraulic cylinder block 11 can output pressure externally, at this time the controller 17 opens the oil cylinder control valve 10, that is, the oil port P of the oil cylinder control valve 10 is communicated with the oil port A. When it is necessary for the hydraulic cylinder block 11 to be in the non-working state, that is, the hydraulic cylinder block 11 does not need to output pressure externally, at this time the controller 17 closes the oil cylinder control valve 10, that is, the oil port P of the oil cylinder control valve 10 is communicated with the oil port B, so that the hydraulic oil discharged from the hydraulic cylinder block 11 flows back to the low-pressure oil tank 14.

[0058] Figure 3The figure shows the situation when natural gas enters from the gas path of the gas-liquid actuated core valve 1 on the left. Assuming this state is the initial movement state, at this time, the piston rod 8 of the main hydraulic cylinder block 6 is located at the leftmost side. First, the natural gas enters the gas-liquid actuated core valve 1 from the gas source inlet and reaches the port A position of the two two-way three-position hydraulic control valves 1-3 after being filtered by the filter 1-1. The pressure sensor 1-2 detects the gas pressure in real time and transmits the pressure data to the controller 16; the controller 16 automatically selects and opens the appropriate oil cylinder control valve 10 according to the current pressure situation, and makes the two-way three-position solenoid valve 5 conduct. The pre-charged pressure oil in the accumulator 15 enters the gas-liquid actuated core valve 1 as the pilot oil through the loop where the two-way three-position solenoid valve 5, the throttle valve 4 and the port A and port P of the two-way four-position manual valve 3 are connected, connecting the port P and port A of the two-way three-position hydraulic control valve 1-3 on the left side. Then, the gas enters the gas-liquid actuated tank 2 through the already-conducted two-way three-position hydraulic control valve 1-3 on the left side. The gas-liquid actuated tank 2 converts the gas pressure into the same liquid pressure and inputs the pressure oil into the left oil chamber of the main hydraulic cylinder block 6. The oil on the right side of the main hydraulic cylinder block 6 is pressured and flows into the gas-liquid actuated tank 2 on the right side. The residual gas in the gas-liquid actuated tank 2 on the right side enters the air through the PB circuit of the two-way three-position hydraulic control valve on the right side and the check valve 1-4. Finally, driven by the pressure oil, the piston rod in the main hydraulic cylinder block 6 drives all the piston rods on the entire moving piston rod 9 to move synchronously to the rightmost side. During this process, the left oil chamber of the hydraulic cylinder block 11 sucks oil from the low-pressure oil tank 14 through the oil suction check valve 12, and the right oil chamber outputs pressure oil through the oil discharge check valve 13 and the oil cylinder control valve 10. The pressure-regulated pressure oil flows to the actuator 16, the accumulator 15 and the gas-liquid actuated core valve 1 respectively. When the moving piston rod 9 moves to the rightmost side, the handle of the two-way four-position manual valve 3 is toggled under the action of the mechanical lever, and the working position of the two-way four-position manual valve 3 is switched to the state where port P and port B are connected and port A and port T are connected.

[0059] As Figure 4 shown, for Figure 3 After the working state shown ends, the working position of the two-way four-position manual valve 3 is switched, so that the gas-liquid actuated core valve 1 is switched from the left gas path being conducted to the right gas path being conducted and the left side being closed. The natural gas enters the gas-liquid actuated tank 2 on the right side from the AP oil path where the two-way three-position hydraulic control valve 1-3 on the right side of the gas-liquid actuated core valve 1 is conducted. Similarly, the gas-liquid actuated tank 2 transports the pressure oil to the right oil chamber of the main hydraulic cylinder block 6. The oil on the left side of the main hydraulic cylinder block 6 is pressured and flows into the gas-liquid actuated tank 2 on the right side. The residual gas in the gas-liquid actuated tank 2 on the left side enters the air through the PB circuit of the two-way three-position hydraulic control valve on the left side and the check valve 1-4. The remaining process is the same as Figure 3Similarly as shown, finally, the hydraulic cylinder group composed of multiple hydraulic cylinder bodies 11 outputs the pressure oil after pressure regulation through the conducting oil cylinder control valve 10. When the two-way four-way manual valve 3 also follows the movement of the piston rod 9 to the leftmost side, it is switched to the working position where the oil port A is connected to the oil port P and the oil port B is connected to the oil port T, and the working state of the pressure regulating mechanism will reach Figure 3 the state shown.

[0060] Combined with Figure 3 and Figure 4 these two states, the two processes shown are alternately carried out multiple times. If the gas pressure changes during the process, the controller 17 will automatically adjust and open the appropriate oil cylinder control valve 10. The continuous operation of the pressure regulating mechanism can supplement the pressure of the accumulator and continuously output the driving pressure to drive the actuator to act.

[0061] In the above solution, the case described takes the combination of 2 hydraulic cylinders as an example, but multiple hydraulic cylinders can be selected according to needs in specific implementation, depending on the specific situation.

[0062] The technical solution of the present invention is not limited to the limitations of the above specific embodiments. Any technical deformation made according to the technical solution of the present invention shall be included within the protection scope of the present invention.

Claims

1. An air-liquid linkage type adaptive pressure regulating mechanism, characterized in that: it includes an air-liquid linkage core valve (1), an air-liquid linkage tank (2), a two-position four-way manual valve (3), a throttle valve (4), a two-position three-way solenoid valve (5), a main hydraulic cylinder block (6), a compression spring (7), a cylinder piston rod (8), a moving piston rod (9), a fuel tank (14), an accumulator (15), an actuator (16) and a controller (17); The inlet end of the air-liquid linkage core valve (1) is externally connected to an air source inlet, and the outlet end of the air-liquid linkage core valve (1) is respectively connected to one end of two air-liquid linkage tanks (2). The other ends of the two air-liquid linkage tanks (2) are respectively communicated with the oil cavities at both ends of the main hydraulic cylinder block (6). The air-liquid linkage core valve (1) is respectively connected to the oil ports A and B of the two-position four-way manual valve (3). The oil inlet P of the two-position four-way manual valve (3) is connected to the oil inlet P of the two-position three-way solenoid valve (5) through the throttle valve (4). The oil return port T of the two-position four-way manual valve (3) is externally connected to the fuel tank (14). The handle of the two-position four-way manual valve (3) is connected to a moving piston rod (9) through a mechanical lever. The main hydraulic cylinder block (6) is located between two moving piston rods (9). The cylinder piston rod (8) is arranged in the main hydraulic cylinder block (6) so as to be movable back and forth along its own axis, and both ends of the cylinder piston rod (8) extend out of the openings on both sides of the main hydraulic cylinder block (6). Both ends of the cylinder piston rod (8) are respectively fixedly connected to two moving piston rods (9). A compression spring (7) is sleeved on the outer side wall of the cylinder piston rod (8). A plurality of hydraulic components are arranged at the position between the two moving piston rods (9), and each hydraulic component is movably connected to the moving piston rod (9) through a cylinder piston rod; The oil port B of the two-position three-way solenoid valve (5) is externally connected to the fuel tank (14). The electromagnetic end of the two-position three-way solenoid valve (5) is electrically connected to the controller (17). The oil port A of the two-position three-way solenoid valve (5) is respectively connected to the hydraulic component, the accumulator (15) and the actuator (16). The hydraulic component is respectively connected to the accumulator (15), the actuator (16) and the controller (17); The described gas-liquid linkage core valve (1) includes a filter (1-1), a pressure sensor (1-2), a two-position three-way hydraulic control valve (1-3), a check valve (1-4), and a core valve body (1-5); the filter (1-1), the pressure sensor (1-2), the two-position three-way hydraulic control valve (1-3), and the check valve (1-4) are all arranged inside the core valve body (1-5). The oil ports A of the two two-position three-way hydraulic control valves (1-3) are connected by a first pipeline, the oil ports B of the two two-position three-way hydraulic control valves (1-3) are connected by a second pipeline, the oil ports P of the two two-position three-way hydraulic control valves (1-3) are respectively connected to two gas-liquid linkage tanks (2), the two two-position three-way hydraulic control valves (1-3) are respectively connected to two oil ports of a two-position four-way manual valve (3), the inlet end of the filter (1-1) is externally connected to a gas source inlet, the outlet end of the filter (1-1) is communicated with the first pipeline, and a pressure sensor (1-2) and a check valve (1-4) are also respectively arranged on the first pipeline and the second pipeline.

2. An adaptive pressure regulating mechanism of a gas-liquid linkage type according to claim 1, characterized in that: The described hydraulic component includes an oil cylinder control valve (10), a hydraulic oil cylinder body (11), a suction check valve (12), and a discharge check valve (13). The inlet of the hydraulic oil cylinder body (11) is connected to an oil tank (14) through the suction check valve (12), the outlet of the hydraulic oil cylinder body (11) is connected to the oil inlet P of the oil cylinder control valve (10) through the discharge check valve (13), the oil port A of the oil cylinder control valve (10) is respectively connected to the oil port A of a two-position three-way solenoid valve (5), an accumulator (15), and an actuator (16), the oil port B of the oil cylinder control valve (10) is externally connected to the oil tank (14), and the electromagnetic end of the oil cylinder control valve (10) is electrically connected to a controller (17); The hydraulic oil cylinder body (11) is located between two moving piston rods (9). The cylinder piston rod is arranged in the hydraulic oil cylinder body (11) so as to be movable back and forth along its own axis, and both ends of the cylinder piston rod extend out of the openings on both sides of the hydraulic oil cylinder body (11), and both ends of the cylinder piston rod are fixedly connected to the two moving piston rods (9) respectively.

3. An adaptive pressure regulating mechanism of a gas-liquid linkage type according to claim 1, characterized in that: The described compression spring (7) is located outside the main hydraulic oil cylinder body (6) and sleeved on the oil cylinder piston rod (8). One end of the compression spring (7) is fixedly connected to the moving piston rod (9), and the other end of the compression spring (7) is fixedly connected to one side of the main hydraulic oil cylinder body (6).

4. An adaptive pressure regulating mechanism of a gas-liquid linkage type according to claim 1, characterized in that: The oil port A of the two-position four-way manual valve (3) is connected to the control oil port of a two-position three-way hydraulic control valve (1-3), and the oil port B of the two-position four-way manual valve (3) is connected to the control oil port of the other two-position three-way hydraulic control valve (1-3).

5. An adaptive pressure regulating mechanism of a gas-liquid linkage type according to claim 1, characterized in that: The described main hydraulic oil cylinder body (6) adopts a double-axis hydraulic oil cylinder.

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