Hydraulic system of hydraulic drive compressor

Abstract

The utility model relates to the technical field of hydraulic compressors, in particular to a hydraulic system of a hydraulic compressor. Comprising an oil tank, an oil outlet of the oil tank is connected with an oil inlet of a variable displacement piston pump through a low-pressure oil pipeline, one branch of the oil outlet of the variable displacement piston pump is connected with an energy accumulator through a high-pressure oil pipeline and a one-way valve, and the other branch of the oil outlet of the variable displacement piston pump is connected with an oil inlet of an electromagnetic reversing valve. An oil outlet of the electromagnetic directional valve is connected with the hydraulic drive compressor through oil inlet and outlet pipelines, the electromagnetic directional valve is further connected with an oil return opening of the oil tank through an oil return pipeline, and a shuttle valve is arranged between the two oil inlet and outlet pipelines and connected with the variable displacement piston pump through a variable displacement oil pipeline. Pressure oil in the oil inlet and outlet pipeline can enter the shuttle valve and then enter the variable displacement piston pump through the variable displacement oil pipeline, a terminal pressure oil signal is provided for the variable displacement piston pump, the variable displacement piston pump can conduct power adjustment according to the pressure change of the terminal pressure oil, the pressure of the terminal pressure oil is kept stable, and therefore stable work of the hydraulic drive compressor is guaranteed.

Description

Technical field:

[0001] The utility model relates to the technical field of liquid-driven compressors, in particular to a hydraulic system for a liquid-driven compressor. Background technology:

[0002] At present, when a compressor pressurizes gas, it drives the piston inside the compressor to reciprocate through a drive mechanism to achieve gas pressurization. The drive mechanism includes a crankshaft connecting rod or hydraulic drive. When hydraulically driven, the current hydraulic system still has the following shortcomings in actual use: First, because the liquid-driven compressor requires high-pressure oil to drive the piston to compress the gas, a plunger pump is required in the hydraulic system to pressurize the hydraulic oil. The power of ordinary plunger pumps is constant and cannot be adjusted according to the pressure changes of the terminal hydraulic oil. It is easy for the terminal hydraulic oil pressure to be too high or insufficient, thereby affecting the stable operation of the liquid-driven compressor. Second, when the plunger pump stops working due to a fault, there is no other pressure-replenishing equipment in the hydraulic system, and the high-pressure oil supply is interrupted. The liquid-driven compressor can only stop and wait, which affects the compression efficiency. Third, the temperature of the hydraulic oil in the hydraulic system cannot be too high or too low, and there are certain requirements for the cleanliness of the hydraulic oil. Otherwise, it is easy to affect the life of various components. Currently, there is no good solution to the above problems.

[0003] In summary, the above-mentioned problems in the hydraulic system of the liquid-driven compressor have become technical difficulties that need to be solved urgently in the industry. Utility model content:

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a liquid-driven compressor hydraulic system, which solves the problem of excessive or insufficient pressure of the terminal hydraulic oil in the previous hydraulic system and solves the problem of no other pressure-replenishing equipment in the previous hydraulic system.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A hydraulic system for a liquid-driven compressor includes an oil tank, the oil outlet of the oil tank is connected to the oil inlet of a variable piston pump via a low-pressure oil pipeline, the oil outlet of the variable piston pump is connected to an accumulator via a high-pressure oil pipeline and a branch after a one-way valve, and the other branch is connected to the oil inlet of an electromagnetic reversing valve, the oil outlet of the electromagnetic reversing valve is connected to the liquid-driven compressor via inlet and outlet oil pipelines, the electromagnetic reversing valve is also connected to the oil return port of the oil tank via an oil return pipeline, a shuttle valve is provided between the two inlet and outlet oil pipelines, and the shuttle valve is connected to the variable piston pump via a variable oil pipeline.

[0007] A high-pressure filter is provided on the high-pressure oil pipeline near the variable piston pump.

[0008] A safety valve is provided on one side of the pipeline of the accumulator.

[0009] An overflow valve and a pressure sensor are provided on the high-pressure oil pipeline between the one-way valve and the electromagnetic reversing valve.

[0010] An oil return filter is provided on the oil return pipeline near the oil tank.

[0011] The side wall of the oil tank is provided with a coil type water cooler, a heater is provided in the oil tank, and a liquid level gauge, a liquid level sensor and a temperature sensor are also provided on the oil tank.

[0012] An air filter is installed on the top of the oil tank, and an oil drain ball valve is provided on one side of the bottom of the oil tank.

[0013] The high-pressure oil pipeline, the inlet and outlet oil pipelines, and the variable oil pipeline are all provided with pressure measuring joints.

[0014] The utility model adopts the above solution and has the following advantages:

[0015] By setting up a variable piston pump, the variable piston pump is connected to the shuttle valve between the two inlet and outlet oil pipelines through a variable oil pipeline. The pressure oil in the inlet and outlet oil pipelines can enter the shuttle valve and then enter the variable piston pump through the variable oil pipeline, providing the terminal pressure oil signal to the variable piston pump. The variable piston pump can adjust the power according to the pressure change of the terminal pressure oil to maintain the pressure of the terminal pressure oil stable, thereby ensuring the stable operation of the liquid-driven compressor; by setting up an accumulator, the high-pressure oil discharged from the variable piston pump can enter the accumulator for storage. The accumulator is responsible for providing high-pressure hydraulic oil after the variable piston pump stops working, so that the liquid-driven compressor can still complete the necessary actions; the coil-type water cooler and heater on the oil tank can maintain the temperature of the hydraulic oil constant to prevent the hydraulic oil temperature from being too high or too low. The high-pressure filter and return oil filter can filter the hydraulic oil in the system. The air filter can prevent impurities in the air from contaminating the hydraulic oil to ensure the cleanliness of the hydraulic oil and thus ensure the service life of each component. Description of the drawings:

[0016] Figure 1 It is a schematic diagram of the structural principle of the utility model.

[0017] In the figure, 1. oil tank, 2. low-pressure oil pipeline, 3. variable piston pump, 4. high-pressure oil pipeline, 5. one-way valve, 6. accumulator, 7. solenoid reversing valve, 8. inlet and outlet oil pipelines, 9. hydraulic drive compressor, 10. return oil pipeline, 11. shuttle valve, 12. variable oil pipeline, 13. high-pressure filter, 14. safety valve, 15. overflow valve, 16. pressure sensor, 17. return oil filter, 18. coil-type water cooler, 19. heater, 20. liquid level gauge, 21. liquid level sensor, 22. temperature sensor, 23. air filter, 24. oil drain ball valve, 25. pressure measuring joint. Specific implementation method:

[0018] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, a hydraulic system of a liquid-driven compressor includes an oil tank 1, the oil outlet of the oil tank 1 is connected to the oil inlet of a variable piston pump 3 via a low-pressure oil pipeline 2, the oil outlet of the variable piston pump 3 is connected to an accumulator 6 via a high-pressure oil pipeline 4 and a one-way valve 5, and the other branch is connected to the oil inlet of an electromagnetic reversing valve 7, the oil outlet of the electromagnetic reversing valve 7 is connected to a liquid-driven compressor 9 via an inlet and outlet oil pipeline 8, and the electromagnetic reversing valve 7 is also connected to the oil return port of the oil tank 1 via an oil return pipeline 10, a shuttle valve 11 is provided between the two inlet and outlet oil pipelines 8, and the shuttle valve 11 is connected to the variable piston pump 3 via a variable oil pipeline 12.

[0020] A high-pressure filter 13 is provided on the high-pressure oil pipeline 4 near the variable piston pump 3. The high-pressure filter 13 can filter the high-pressure oil to ensure the cleanliness of the hydraulic oil.

[0021] A safety valve 14 is provided on one side of the pipeline of the accumulator 6. The safety valve 14 can prevent the accumulator 6 from having excessive pressure, thus playing a role of safety protection.

[0022] A relief valve 15 and a pressure sensor 16 are provided on the high-pressure oil pipeline 4 between the one-way valve 5 and the electromagnetic reversing valve 7. The pressure sensor 16 can detect the high-pressure oil signal at any time. The relief valve 15 can play an overflow protection role when the high-pressure oil pressure is too high to prevent the system pressure from overloading.

[0023] A return oil filter 17 is provided on the return oil pipeline 10 near the oil tank 1 , and the return oil filter 17 can filter the return oil to ensure the cleanliness of the hydraulic oil.

[0024] A coil-type water cooler 18 is provided on the side wall of the oil tank 1, and a heater 19 is provided in the oil tank 1. The coil-type water cooler 18 and the heater 19 can keep the temperature of the hydraulic oil constant to prevent the hydraulic oil temperature from being too high or too low. A liquid level gauge 20, a liquid level sensor 21 and a temperature sensor 22 are also provided on the oil tank 1 to monitor the liquid level and temperature of the hydraulic oil in real time.

[0025] An air filter 23 is installed on the top of the oil tank 1 to prevent impurities in the air from contaminating the hydraulic oil. A drain ball valve 24 is provided on one side of the bottom of the oil tank 1 .

[0026] The high-pressure oil pipeline 4, the inlet and outlet oil pipelines 8, and the variable oil pipeline 12 are all provided with pressure measuring joints 25, which can be connected to pressure measuring elements for pressure measurement.

[0027] Working principle:

[0028] During operation, the hydraulic oil in the oil tank 1 enters the variable displacement piston pump 3 through the low-pressure oil line 2. The hydraulic oil is pressurized in the variable displacement piston pump 3 to form high-pressure oil, which is then transported backward through the high-pressure oil line 4. A check valve 5 prevents the high-pressure oil from flowing back. One branch of the high-pressure oil enters the accumulator 6 for storage, while the other branch enters the solenoid reversing valve 7. The high-pressure oil is then supplied to the hydraulic compressor 9 through the inlet and outlet oil lines 8. The solenoid reversing valve 7 controls the flow of high-pressure oil, driving the hydraulic compressor 9. The returned hydraulic oil enters the oil tank 1 through the return oil line 10, forming a closed-loop circulation of hydraulic oil. The pressurized oil in the inlet and outlet oil lines 8 enters the shuttle valve 11 and then enters the variable displacement piston pump 3 through the variable oil line 12, providing the variable displacement piston pump 3 with a terminal pressure oil signal. The variable displacement piston pump 3 can adjust its power according to the pressure changes of the terminal pressure oil to maintain a stable terminal pressure, thereby ensuring the stable operation of the hydraulic compressor 9. After the variable piston pump 3 stops working, the accumulator 6 can continue to supply high-pressure hydraulic oil to the electromagnetic reversing valve 7, so that the liquid-driven compressor 9 can still complete the necessary actions.

[0029] The above specific implementation methods cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or transformation made to the implementation methods of the present utility model falls within the protection scope of the present utility model.

[0030] Anything not described in detail in the present invention is well known to those skilled in the art.

Claims

1. A hydraulic system for a liquid-driven compressor, characterized in that: It includes an oil tank, the oil outlet of the oil tank is connected to the oil inlet of the variable plunger pump through a low-pressure oil pipeline, the oil outlet of the variable plunger pump is connected to the accumulator through a high-pressure oil pipeline and a branch after the one-way valve, and the other branch is connected to the oil inlet of the electromagnetic reversing valve, the oil outlet of the electromagnetic reversing valve is connected to the liquid-driven compressor through the inlet and outlet oil pipelines, the electromagnetic reversing valve is also connected to the oil return port of the oil tank through the return oil pipeline, a shuttle valve is provided between the two inlet and outlet oil pipelines, and the shuttle valve is connected to the variable plunger pump through the variable oil pipeline.

2. A hydraulic system for a liquid-driven compressor according to claim 1, characterized in that: A high-pressure filter is provided on the high-pressure oil pipeline near the variable piston pump.

3. The hydraulic system of a liquid-driven compressor according to claim 1, characterized in that: A safety valve is provided on one side of the pipeline of the accumulator.

4. The hydraulic system of a liquid-driven compressor according to claim 1, characterized in that: An overflow valve and a pressure sensor are provided on the high-pressure oil pipeline between the one-way valve and the electromagnetic reversing valve.

5. The hydraulic system of a liquid-driven compressor according to claim 1, characterized in that: An oil return filter is provided on the oil return pipeline near the oil tank.

6. The hydraulic system of a liquid-driven compressor according to claim 1, characterized in that: The side wall of the oil tank is provided with a coil type water cooler, a heater is provided in the oil tank, and a liquid level gauge, a liquid level sensor and a temperature sensor are also provided on the oil tank.

7. The hydraulic system of a liquid-driven compressor according to claim 1, characterized in that: An air filter is installed on the top of the oil tank, and an oil drain ball valve is provided on one side of the bottom of the oil tank.

8. The hydraulic system of a liquid-driven compressor according to claim 1, characterized in that: The high-pressure oil pipeline, the inlet and outlet oil pipelines, and the variable oil pipeline are all provided with pressure measuring joints.

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