Hydraulic drive hydrogen compressor oil cylinder circulating system

Abstract

The utility model provides a hydraulic drive hydrogen compressor oil cylinder circulation system which comprises a hydraulic drive hydrogen compressor, a hydraulic drive assembly, a heater and an oil change assembly, the heater is arranged in an oil tank of the hydraulic drive assembly, and the oil change assembly comprises an oil change pipeline and an oil change control valve. The oil changing pipeline is connected with at least one of the first cavity and the second cavity of the hydraulic drive hydrogen compressor and an oil tank of the hydraulic drive assembly, and the oil changing control valve is arranged on the oil changing pipeline. When the temperature of the hydraulic oil is low, the heater and an oil pump of the hydraulic drive assembly are started firstly, and an oil change control valve is controlled to be opened, so that the hydraulic oil heated by the heater replaces the hydraulic oil originally located in the hydraulic drive hydrogen compressor; therefore, when the liquid-driven hydrogen compressor is started, hydraulic oil entering the liquid-driven hydrogen compressor is at the normal working temperature, and the problems that an oil cylinder circulating system of the liquid-driven hydrogen compressor is difficult to start under the low-temperature condition and damage is caused to equipment are solved.

Description

Technical Field

[0001] This utility model relates to the field of compressor hydraulic system technology, and in particular to a liquid-driven hydrogen compressor cylinder circulation system. Background Technology

[0002] The liquid-driven hydrogen compressor equipment consists of two parts: a hydraulic station and a compressor. The hydraulic station provides pressure to the compressor to drive it to work, and the compressor provides power to pressurize the gas.

[0003] Generally, liquid-driven hydrogen compressor equipment is installed in open-air environments such as power stations. In northern regions with winters and large diurnal temperature variations, the ambient temperature is low at night. Hydraulic oil has viscosity characteristics, which change with temperature. In low ambient temperatures, when the equipment is not running at night, the viscosity of the hydraulic oil increases, reducing its fluidity. The hydraulic oil in the cylinders of the liquid-driven hydrogen compressor experiences reduced fluidity at low temperatures. This can lead to poor circulation in the compressor's hydraulic system, difficulty starting, and prolonged periods of abnormal operation, causing damage to the equipment, significantly reducing its lifespan, and in severe cases, rendering the equipment unusable and forcing shutdowns and production stoppages. Utility Model Content

[0004] The purpose of this invention is to solve the problem that the existing liquid-driven hydrogen compressor cylinder circulation system is prone to damage to the equipment when started at low temperatures.

[0005] To solve the above-mentioned technical problems, this utility model provides a liquid-driven hydrogen compressor cylinder circulation system, including a liquid-driven hydrogen compressor, a hydraulic drive assembly, a heater, and an oil change assembly. The liquid-driven hydrogen compressor includes a cylinder body, a drive-side piston, and a drive rod. The drive-side piston is movably disposed within the cylinder body, dividing the interior of the cylinder body into a first chamber and a second chamber. The drive rod is connected to the drive-side piston. The hydraulic drive assembly includes an oil tank, an oil pump, an oil inlet control valve, and an oil inlet pipe. The oil inlet pipe is connected to the oil tank, the first chamber, and the second chamber. The oil pump and the oil inlet control valve are both connected to the oil inlet pipe, and the oil pump is disposed within the oil inlet control valve. The oil inlet control valve is located between the control valve and the oil tank; the oil inlet control valve is used to control the oil tank to connect to the first cavity or the second cavity through the oil inlet pipe; a heater is disposed in the oil tank for heating the hydraulic oil in the oil tank; the oil changing assembly includes an oil changing pipeline and an oil changing control valve, the oil changing pipeline connects to at least one of the first cavity and the second cavity and the oil tank, and when the oil inlet pipe is connected to the first cavity, the oil changing pipeline is at least connected to the first cavity, or when the oil inlet pipe is connected to the second cavity, the oil changing pipeline is at least connected to the second cavity; the oil changing control valve is disposed on the oil changing pipeline to control the on / off state of the oil changing pipeline.

[0006] In some embodiments of this application, the oil change pipeline is connected to both the first cavity and the second cavity, and the oil change control valve can control the connection between the first cavity and the oil tank and the connection between the second cavity and the oil tank.

[0007] In some embodiments of this application, the oil change pipeline includes a first oil change pipeline and a second oil change pipeline. The first oil change pipeline connects the first cavity and the oil tank, and the second oil change pipeline connects the second cavity and the oil tank. The oil change control valve includes a first oil change control valve and a second oil change control valve. The first oil change control valve is connected in series with the first oil change pipeline to control the on / off state of the first oil change pipeline, and the second oil change control valve is connected in series with the second oil change pipeline to control the on / off state of the second oil change pipeline.

[0008] In some embodiments of this application, the cylinder block is provided with a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port and the second oil port are spaced apart and are both connected to the first cavity. The third oil port and the fourth oil port are spaced apart and are both connected to the second cavity. The first oil port and the third oil port are respectively connected to the oil inlet pipe, and the second oil port and the fourth oil port are connected to the oil change pipe.

[0009] In some embodiments of this application, the oil inlet control valve is a reversing valve; the oil inlet control valve includes a first interface, a second interface, a third interface, and a fourth interface; the oil inlet control valve can switch to a first state where the first interface is connected to the second interface and the third interface is connected to the fourth interface, or switch to a second state where the first interface is connected to the third interface and the second interface is connected to the fourth interface; the oil inlet pipeline includes a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline, the first pipeline connecting the oil tank and the first interface, the second pipeline connecting the second interface and the first cavity, the third pipeline connecting the third interface and the second cavity, and the fourth pipeline connecting the fourth interface and the oil tank; the oil pump is connected in series on the first pipeline.

[0010] In some embodiments of this application, the oil inlet control valve can also be switched to a third state in which the first interface, the second interface, the third interface, and the fourth interface are not connected to each other; the hydraulic drive assembly also includes an overflow pipeline and an overflow valve, the overflow pipeline is connected to the first pipeline and the oil tank, and the overflow valve is disposed on the overflow pipeline.

[0011] In some embodiments of this application, the hydraulic drive assembly further includes a check valve and an accumulator. The check valve is connected in series with the first pipeline and is located between the oil pump and the oil inlet control valve. The accumulator is connected to the first pipeline and is located between the check valve and the oil inlet control valve.

[0012] In some embodiments of this application, the hydraulic drive assembly further includes a cooler, which is disposed on the fourth pipe or the oil tank.

[0013] In some embodiments of this application, the hydraulic cylinder circulation system of the liquid-driven hydrogen compressor further includes a temperature sensor, which is disposed inside the oil tank and is used to detect the temperature of the hydraulic oil in the oil tank.

[0014] In some embodiments of this application, the oil pump includes a motor, a hydraulic pump, a pump frame, and shock absorbers. A plurality of shock absorbers are spaced apart on the pump frame, and the pump frame is connected to a component for mounting the oil pump via the shock absorbers. The motor and the hydraulic pump are both fixed on the pump frame, and the rotating shaft of the hydraulic pump is drivenly connected to the output shaft of the motor.

[0015] As can be seen from the above technical solution, the beneficial effects of this utility model are as follows:

[0016] The hydraulic cylinder circulation system of the liquid-driven hydrogen compressor of this application includes a liquid-driven hydrogen compressor, a hydraulic drive assembly, a heater, and an oil changing assembly. The hydraulic drive assembly is connected to the liquid-driven hydrogen compressor and provides hydraulic oil to drive the liquid-driven hydrogen compressor to work. The heater is connected to the oil tank and heats the hydraulic oil. The oil changing assembly includes an oil changing pipeline and an oil changing control valve. The oil changing pipeline connects to at least one of the first chamber and the second chamber and the oil tank. The first chamber or the second chamber connected to the oil changing pipeline is connected to the oil tank through an oil inlet pipe, so that the oil tank, the liquid-driven hydrogen compressor, and the oil changing pipeline form a circulation loop. The oil changing control valve is located on the oil changing pipeline. When the hydraulic oil temperature is low, by starting the heater and the oil pump of the hydraulic drive component, and controlling the opening of the oil change control valve, the hydraulic oil heated by the heater enters the liquid-driven hydrogen compressor under the action of the oil pump. The hydraulic oil originally located in the liquid-driven hydrogen compressor is replaced by hydraulic oil at normal operating temperature through the oil change pipeline. This ensures that the hydraulic oil entering the liquid-driven hydrogen compressor when it starts is at normal operating temperature. Moreover, the liquid-driven hydrogen compressor does not need to be started when replacing the low-temperature hydraulic oil, avoiding the problems of difficulty in starting the hydraulic cylinder circulation system of the liquid-driven hydrogen compressor under low temperature conditions and damage to the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the hydraulic cylinder circulation system of a liquid-driven hydrogen compressor in one embodiment.

[0018] Figure 2 This is a schematic diagram of the structure of a liquid-driven hydrogen compressor in one embodiment.

[0019] Figure 3 This is a schematic diagram of the structure of a hydraulic drive assembly in one embodiment.

[0020] Figure 4 This is a schematic diagram of the oil inlet control valve in one embodiment.

[0021] Figure 5 This is a schematic diagram of the structure of an oil pump in one embodiment.

[0022] Figure 6 This is a schematic diagram of the oil change assembly in one embodiment.

[0023] The reference numerals in the attached drawings are explained as follows: 1-Liquid-driven hydrogen compressor; 11-Cylinder; 111-Liquid chamber; 1111-First chamber; 1112-Second chamber; 112-Hydrogen chamber; 113-Inlet; 114-Outlet; 115-First oil port; 116-Second oil port; 117-Third oil port; 118-Fourth oil port; 12-Drive side piston; 13-Drive rod; 14-Hydrogen side piston; 15-Inlet check valve; 16-Outlet check valve; 2-Hydraulic drive assembly; 21-Oil tank; 22-Oil pump; 221-Motor; 222-Hydraulic pump; 223-Pump frame; 224-Shock absorber; 23-Inlet control valve; 231-First interface; 232-Second interface; 233-Third interface; 234-Fourth interface; 235-Second interface; 236-Second interface; 237-Second interface; 238-Second interface; 239-Second interface; 220-Second interface; 231-First interface; 232-Second interface; 233-Third interface; 234-Second interface; 235-Second interface; 236-Second interface; 237-Second interface; 238-Second interface; 239-Second interface; 220-Second interface; 231-Second interface; 232-Second interface; 233-Second interface; 234-Second interface; 235-Second interface; 236-Second interface; 2 Four-port; 24-Inlet pipe; 241-First pipe; 242-Second pipe; 243-Third pipe; 244-Fourth pipe; 25-Overflow pipe; 26-Overflow valve; 3-Heater; 4-Oil change assembly; 41-Oil change pipe; 411-First oil change pipe; 412-Second oil change pipe; 42-Oil change control valve; 421-First oil change control valve; 422-Second oil change control valve; 51-Check valve; 52-Accumulator; 53-Control valve; 54-Inlet oil filter; 55-Return oil filter; 56-Pressure transmitter; 57-Pressure gauge; 58-Cooler; 61-Temperature sensor; 62-Magnetic rod; 63-Air filter; 64-Replenishment control valve; 65-Level controller; 66-Level gauge. Detailed Implementation

[0024] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0025] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) 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. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0026] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Existing liquid-driven hydrogen compressor cylinder circulation systems typically consist of only the liquid-driven hydrogen compressor and a hydraulic drive assembly. The hydraulic drive assembly connects to the liquid-driven hydrogen compressor and provides it with power, enabling the compressor to continuously pressurize hydrogen. However, existing liquid-driven hydrogen compressors cannot replace the hydraulic oil inside when not in operation. Furthermore, the viscosity of the hydraulic oil increases and its fluidity decreases at low temperatures, leading to poor circulation and starting difficulties in the liquid-driven hydrogen compressor cylinder circulation system. Prolonged abnormal operation can damage the equipment, significantly reducing its lifespan, and in severe cases, causing equipment failure and production shutdown.

[0028] See Figure 1 To address the above issues, this application proposes a hydraulic cylinder circulation system for a liquid-driven hydrogen compressor, comprising a liquid-driven hydrogen compressor 1, a hydraulic drive assembly 2, a heater 3, and an oil changing assembly 4. The hydraulic drive assembly 2 is connected to the liquid-driven hydrogen compressor 1 and provides it with operating power. The heater 3 can be an electric heater or a heat exchanger; preferably, the heater 3 in this application is an explosion-proof electric heater. The heater 3 is located within the oil tank 21 of the hydraulic drive assembly 2 and is used to heat the hydraulic oil within the tank 21. The oil changing assembly 4 includes an oil changing pipeline 41 and an oil changing control valve 42. The oil changing pipeline 41 is connected to the liquid-driven hydrogen compressor 1, and the oil changing control valve 42 is located on the oil changing pipeline 41 to control the on / off state of the oil changing pipeline 41. When the temperature of the hydraulic oil in the liquid-driven hydrogen compressor 1 is too low, the oil change control valve 42 is opened and the hydraulic drive component 2 is operated, so that the hydraulic drive component 2 provides hydraulic oil of a suitable temperature to the liquid-driven hydrogen compressor 1 and replaces the low-temperature hydraulic oil originally located in the liquid-driven hydrogen compressor 1, so that the hydraulic oil inside the liquid-driven hydrogen compressor 1 has a higher temperature when it starts up.

[0029] When replacing the hydraulic oil in the liquid-driven hydrogen compressor 1, the liquid-driven hydrogen compressor 1 does not need to perform any action. That is, the hydraulic oil circulation system of the liquid-driven hydrogen compressor can replace the hydraulic oil in the liquid-driven hydrogen compressor 1 without starting the liquid-driven hydrogen compressor 1. This avoids the problem of starting difficulties and damage to the equipment caused by the increased viscosity and reduced fluidity of the hydraulic oil in the liquid-driven hydrogen compressor cylinder circulation system at low temperatures.

[0030] For details, please refer to Figure 2 The liquid-driven hydrogen compressor 1 includes a cylinder 11, a drive-side piston 12 and a drive rod 13, and a hydrogen-side piston 14. The cylinder 11 has a liquid chamber 111 and a hydrogen chamber 112. The drive-side piston 12 is slidably connected inside the liquid chamber 111 of the cylinder 11, dividing the liquid chamber 111 into a first chamber 1111 and a second chamber 1112. The hydrogen-side piston 14 is slidably connected inside the hydrogen chamber 112 of the cylinder 11. The drive rod 13 connects the drive-side piston 12 and the hydrogen-side piston 14. The cylinder 11 has an inlet 113 and an outlet 114 at the hydrogen chamber 112. An inlet check valve 15 is provided at the inlet 113 to restrict the gas to flow only into the hydrogen chamber 112. An outlet check valve 16 is provided at the outlet 114 to restrict the gas to flow only out of the hydrogen chamber 112.

[0031] The working principle of the liquid-driven hydrogen compressor 1 is as follows: When hydraulic oil enters the first chamber 1111, the pressurized oil pushes the drive-side piston 12 towards the second chamber 1112. This drives the hydrogen-side piston 14 via the drive rod 13, increasing the volume of the hydrogen chamber 112 and creating a negative pressure. Hydrogen is then drawn into the hydrogen chamber 112 under this negative pressure. When hydraulic oil enters the second chamber 1112, the pressurized oil pushes the drive-side piston 12 towards the first chamber 1111. This drives the hydrogen-side piston 14 via the drive rod 13, decreasing the volume of the hydrogen chamber 112 and compressing and pressurizing the hydrogen within. Thus, by driving the drive-side piston 12 to reciprocate within the liquid chamber 111, continuous pressurization of the hydrogen is achieved.

[0032] exist Figure 2In the illustrated embodiment, two hydrogen chambers 112 are provided, and the two hydrogen chambers 112 are located on opposite sides of the axial direction of the liquid chamber 111. Each hydrogen chamber 112 is slidably connected to a hydrogen-side piston 14. The middle part of the drive rod 13 is fixedly connected to the drive-side piston 12, and the two ends of the drive rod 13 are respectively connected to the hydrogen-side pistons 14 located in the two hydrogen chambers 112, so that the drive rod 13 simultaneously drives the two hydrogen-side pistons 14 to move. When the pressurized oil pushes the drive-side piston 12 toward the second chamber 1112, the volume of the hydrogen chamber 112 near the first chamber 1111 increases, creating a negative pressure. Under this negative pressure, hydrogen is drawn into the chamber. The hydrogen in the hydrogen chamber 112 near the second chamber 1112 is pressurized by the hydrogen-side piston 14 and discharged from the hydrogen chamber 112. Conversely, when the pressurized oil pushes the drive-side piston 12 toward the first chamber 1111, the volume of the hydrogen chamber 112 near the second chamber 1112 increases, creating a negative pressure. Under this negative pressure, hydrogen is drawn into the chamber. The hydrogen in the hydrogen chamber 112 near the first chamber 1111 is pressurized by the hydrogen-side piston 14 and discharged from the hydrogen chamber 112. Thus, by driving the piston 12 on the drive side to reciprocate within the liquid chamber 111 through hydraulic oil, continuous pressurization of hydrogen is achieved. Moreover, hydrogen is pressurized twice in one reciprocating motion of the piston 12 on the drive side, thereby improving pressurization efficiency.

[0033] In other embodiments, the positions of the hydrogen chamber 112 and the liquid chamber 111 are interchanged, i.e., two liquid chambers 111 are provided, and the two liquid chambers 111 are located on opposite sides of the hydrogen chamber 112 along its axial direction. Each liquid chamber 111 has a drive-side piston 12 slidably connected inside it. The middle part of a drive rod 13 is fixedly connected to a hydrogen-side piston 14, and both ends of the drive rod 13 are connected to the drive-side pistons 12 located in the two liquid chambers 111, respectively. This allows the two drive-side pistons 12 and the hydrogen-side piston 14 to move synchronously, so that when the hydraulic oil drives the drive-side piston 12, it drives the hydrogen-side piston 14 to compress the hydrogen. Alternatively, only one liquid chamber 111 and one hydrogen chamber 112 are provided. Figure 2 The liquid-driven hydrogen compressor 1 has a hydrogen chamber 112 on one side of the liquid chamber 111.

[0034] It should be noted that the cylinder 11, which is provided with the liquid chamber 111 and the hydrogen chamber 112, can be a single integrated structure, meaning that both the liquid chamber 111 and the hydrogen chamber 112 are simultaneously provided on one cylinder 11. Alternatively, the cylinder 11 can be a separate structure, meaning that the cylinder 11 comprises a separate liquid cylinder and a hydrogen cylinder, with the hydrogen cylinder and liquid cylinder fixedly connected. The hydrogen-side piston 14 is correspondingly positioned to correspond to the hydrogen cylinder.

[0035] The cylinder body 11 is provided with a first oil port 115, a second oil port 116, a third oil port 117, and a fourth oil port 118. The first oil port 115 and the second oil port 116 are spaced apart and both communicate with the first cavity 1111. The third oil port 117 and the fourth oil port 118 are spaced apart and both communicate with the second cavity 1112. The first oil port 115 and the third oil port 117 are used to connect to the hydraulic drive assembly 2, thereby enabling the hydraulic drive assembly 2 to supply hydraulic oil to the first cavity 1111 or the second cavity 1112. The second oil port 116 and the fourth oil port 118 are used to connect to the oil changing pipeline 41, thereby enabling the hydraulic oil in the first cavity 1111 or the second cavity 1112 to be discharged. In some embodiments, only one of the second oil port 116 and the fourth oil port 118 may be provided.

[0036] Preferably, the first oil port 115 and the second oil port 116 are located on opposite sides of the first cavity 1111, such that the hydraulic oil entering the first cavity 1111 from the first oil port 115 pushes the hydraulic oil originally stored in the first cavity 1111 in the direction of flowing towards the second oil port 116. Therefore, the hydraulic oil originally stored in the first cavity 1111 flows out from the second oil port 116 first, improving the hydraulic oil replacement effect. Similarly, the third oil port 117 and the fourth oil port 118 are located on opposite sides of the second cavity 1112, such that the hydraulic oil entering the second cavity 1112 from the third oil port 117 pushes the hydraulic oil originally stored in the second cavity 1112 in the direction of flowing towards the fourth oil port 118. Therefore, the hydraulic oil originally stored in the second cavity 1112 flows out from the fourth oil port 118 first, improving the hydraulic oil replacement effect.

[0037] See 1 and Figure 3 The hydraulic drive assembly 2 includes an oil tank 21, an oil pump 22, an oil inlet control valve 23, and an oil inlet pipe 24. The oil inlet pipe 24 is connected to the oil tank 21, the first cavity 1111, and the second cavity 1112. The oil pump 22 and the oil inlet control valve 23 are both connected to the oil inlet pipe 24, and the oil pump 22 is located between the oil inlet control valve 23 and the oil tank 21. The oil inlet control valve 23 is used to control the oil tank 21 to communicate with the first cavity 1111 or the second cavity 1112 through the oil inlet pipe 24, so that the oil tank 21 can provide hydraulic oil to the first cavity 1111 and also provide hydraulic oil to the second cavity 1112.

[0038] exist Figure 1 , Figure 2 and Figure 4In the embodiment shown, the oil inlet control valve 23 is a reversing valve; the oil inlet control valve 23 includes a first interface 231, a second interface 232, a third interface 233, and a fourth interface 234; the oil inlet control valve 23 can switch to a first state where the first interface 231 is connected to the second interface 232 and the third interface 233 is connected to the fourth interface 234, or switch to a second state where the first interface 231 is connected to the third interface 233 and the second interface 232 is connected to the fourth interface 234.

[0039] The oil inlet pipe 24 includes a first pipe 241, a second pipe 242, a third pipe 243, and a fourth pipe 244. The first pipe 241 connects the oil tank 21 and the first interface 231. The second pipe 242 connects the second interface 232 and the first oil port 115, which communicates with the first cavity 1111. The third pipe 243 connects the third interface 233 and the third oil port 117, which communicates with the second cavity 1112. The fourth pipe 244 connects the fourth interface 234 and the oil tank 21. The oil pump 22 is connected in series with the first pipe 241.

[0040] During normal operation of the liquid-driven hydrogen compressor 1, when the oil inlet control valve 23 switches to the first state where the first interface 231 and the second interface 232 are connected, and the third interface 233 and the fourth interface 234 are connected, and the oil pump 22 is in operation, the hydraulic oil inside the oil tank 21 enters the first chamber 1111 in sequence through the first pipe 241, the oil inlet control valve 23, and the second pipe 242 under the action of the oil pump 22. The hydraulic oil in the second chamber 1112 flows back to the oil tank 21 through the third pipe 243 and the fourth pipe 244, thereby pushing the drive-side piston 12 to move towards the second chamber 1112. When the oil inlet control valve 23 switches to the second state, where the first port 231 and the third port 233 are connected, and the second port 232 and the fourth port 234 are connected, and the oil pump 22 is in operation, the oil pump 22 draws the hydraulic oil from the oil tank 21 through the first pipe 241, the oil inlet control valve 23, and the third pipe 243 into the second chamber 1112. The hydraulic oil in the first chamber 1111 flows back to the oil tank 21 through the second pipe 242 and the fourth pipe 244, thereby pushing the drive-side piston 12 towards the first chamber 1111. By controlling the oil inlet control valve 23 to repeatedly switch between the first and second states, the continuous operation of the liquid-driven hydrogen compressor 1 is achieved.

[0041] The oil inlet control valve 23 can also switch to a third state in which the first port 231, the second port 232, the third port 233, and the fourth port 234 are not connected to each other. When the oil inlet control valve 23 is in the third state, the liquid-driven hydrogen compressor 1 is in standby mode, and the first chamber 1111 and the second chamber 1112 are in a pressure-holding state, so that the hydrogen entering the hydrogen chamber 112 cannot push the drive-side piston 12 to move, thus preventing the drive-side piston 12 from moving due to external forces (such as hydrogen pressure) in the low-temperature hydraulic oil environment.

[0042] In other embodiments, an oil inlet pipe and an oil return pipe are provided between the first cavity 1111 and the oil tank 21, and between the second cavity 1112 and the oil tank 21. Both oil inlet pipes are connected to the oil tank 21 via the oil pump 22. The oil inlet control valve 23 includes four shut-off valves, which are respectively located on the two oil inlet pipes and the two oil return pipes. Thus, through the control of the four shut-off valves, the hydraulic drive assembly 2 can also provide hydraulic oil for the operation of the liquid-driven hydrogen compressor 1.

[0043] The hydraulic drive assembly 2 also includes an overflow pipe 25 and an overflow valve 26. The overflow pipe 25 is connected to the first pipe 241 and the oil tank 21, and the overflow valve 26 is installed on the overflow pipe 25. The overflow valve 26 can be set to a maximum hydraulic pressure. When the hydraulic pressure in the first pipe 241 exceeds the set maximum hydraulic pressure, some hydraulic oil flows back to the oil tank 21 through the overflow pipe 25, thus maintaining the hydraulic pressure in the first pipe 241 within a safe range. In particular, when the oil inlet control valve 23 is in the third state, the first pipe 241, the overflow pipe 25, and the oil tank 21 form an internal circulation structure, which maintains the pressure of the hydraulic cylinder circulation system of the liquid-driven hydrogen compressor within a safe pressure range.

[0044] In an alternative embodiment, when the oil inlet control valve 23 is in the third state, the first interface 231 and the fourth interface 234 can also be in a connected state, so that the hydraulic oil in the first pipe 241 flows back to the oil tank 21 from the fourth pipe 244 after passing through the first interface 231 and the fourth interface 234 of the oil inlet control valve 23.

[0045] The end of the overflow pipe 25 that is away from the first pipe 241 can be directly connected to the fourth pipe 244, which can shorten the pipe length required for the overflow pipe 25.

[0046] See Figure 5The oil pump 22 includes a motor 221, a hydraulic pump 222, a pump frame 223, and shock absorbers 224. The pump frame 223 is equipped with multiple spaced shock absorbers 224, and is connected to the installation site or component of the oil pump 22 via the shock absorbers 224. Both the motor 221 and the hydraulic pump 222 are fixed to the pump frame 223, and the shaft of the hydraulic pump 222 is connected to the output shaft of the motor 221, allowing the motor 221 to drive the hydraulic pump 222. The vibrations generated during the operation of the motor 221 and the hydraulic pump 222 are absorbed by the shock absorbers 224, preventing damage to the installation site of the oil pump 22 and reducing noise. The hydraulic pump 222 is connected in series to the first pipeline 241, enabling it to pump hydraulic oil from the oil tank 21 to the liquid-driven hydrogen compressor 1. It should be noted that the oil pump 22 may also consist only of the motor 221 and the hydraulic pump 222, without the pump frame 223 and shock absorbers 224. The motor 221 and the hydraulic pump 222 can be connected by a coupling or directly.

[0047] For example, the pump frame 223 has a flat plate structure, and shock absorbers 224 are provided at the four corners of the bottom surface, and the pump frame 223 is supported by the shock absorbers 224. The motor 221 and the hydraulic pump 222 are fixed to the top surface of the pump frame 223. The vibration generated by the motor 221 and the hydraulic pump 222 when they are working is absorbed by the shock absorbers 224 and will not be transmitted to the ground.

[0048] See Figure 1 and Figure 2 The hydraulic drive assembly 2 also includes a check valve 51, which is connected in series with the first pipe 241 and located between the oil pump 22 and the oil inlet control valve 23 to prevent the hydraulic oil in the liquid-driven hydrogen compressor 1 from flowing back through the first pipe 241 into the oil tank 21.

[0049] The hydraulic drive assembly 2 also includes an accumulator 52, which is connected to the first pipe 241. The accumulator 52 is used to adjust the pressure of the hydraulic oil in the first pipe 241, so that the pressure of the hydraulic oil entering the liquid-driven hydrogen compressor 1 is more stable. Preferably, the accumulator 52 is located between the check valve 51 and the oil inlet control valve 23, that is, the accumulator 52 is located on the side of the check valve 51 away from the oil pump 22, so that when the oil pump 22 stops working, the hydraulic oil in the accumulator 52 will not flow back to the oil tank 21 through the first pipe 241, thereby achieving pressure maintenance of the accumulator 52.

[0050] A control valve 53 can also be connected in series between the accumulator 52 and the first pipeline 241. The control valve 53 is used to control the on / off connection between the accumulator 52 and the first pipeline 241. When the accumulator 52 needs to be replaced, the hydraulic oil leakage of the first pipeline 241 can be avoided by closing the control valve 53.

[0051] The hydraulic drive assembly 2 also includes an inlet filter 54, which is connected in series on the first pipe 241 and located between the oil pump 22 and the check valve 51. This allows the hydraulic oil in the tank 21 and the oil pump 22 to be filtered by the inlet filter 54, preventing impurities in the hydraulic oil from entering downstream equipment (such as the accumulator 52, the inlet control valve 23, and the liquid-driven hydrogen compressor 1) and causing damage. It should be noted that the inlet filter 54 can also be located at the end of the first pipe 241 near the tank 21, so that the hydraulic oil in the tank 21 passes through the inlet filter 54 before passing through the oil pump 22.

[0052] In one embodiment, a return oil filter 55 is connected in series on the fourth pipe 244, and the return oil filter 55 is located downstream of the overflow pipe 25, so that the hydraulic oil discharged from the liquid-driven hydrogen compressor 1 and the hydraulic oil after passing through the overflow valve 26 both pass through the return oil filter 55. Thus, one return oil filter 55 can filter the hydraulic oil discharged from the liquid-driven hydrogen compressor 1 and the hydraulic oil after passing through the overflow valve 26, eliminating the need for multiple return oil filters 55, making the structure simpler and the cost lower.

[0053] In one embodiment, the hydraulic oil passing through the oil change assembly 4 may not pass through the return oil filter 55. Since the hydraulic oil is discharged from the oil change assembly 4 into the oil tank 21 only when its temperature is low, and the viscosity of the hydraulic oil is higher at lower temperatures, setting the hydraulic oil passing through the oil change assembly 4 to not pass through the return oil filter 55 reduces the possibility of clogging the return oil filter 55. When the liquid-driven hydrogen compressor 1 needs to be cleaned, the hydraulic oil in the liquid-driven hydrogen compressor 1 is directly discharged to the outside of the oil tank 21 through the oil change assembly 4, and there is no need to filter the hydraulic oil passing through the oil change assembly 4.

[0054] The hydraulic drive assembly 2 also includes a pressure transmitter 56, which is connected to the first pipeline 241 and to the end of the overflow pipeline 25 near the first pipeline 241. This allows the pressure transmitter 56 to detect the pressure of the first pipeline 241 and thus accurately adjust the set pressure value of the overflow valve 26 and accurately control the working pressure of the liquid-driven hydrogen compressor 1 based on the signal from the pressure transmitter 56.

[0055] In one embodiment, the hydraulic drive assembly 2 further includes a pressure gauge 57 connected to the first pipe 241, so that the working pressure of the liquid-driven hydrogen compressor 1 can be directly obtained through the pressure gauge 57.

[0056] The hydraulic drive assembly 2 also includes a cooler 58, which is disposed on the fourth pipe 244 or the oil tank 21. During continuous operation, the liquid-driven hydrogen compressor 1 generates heat, causing the hydraulic oil temperature to rise. Connecting the cooler 58 in series with the fourth pipe 244 or placing it in the oil tank 21 cools the hydraulic oil, maintaining it at an optimal operating temperature. The cooler 58 can be a heat exchanger or a thermoelectric cooler.

[0057] The hydraulic cylinder circulation system of the liquid-driven hydrogen compressor also includes a temperature sensor 61, which is installed inside the oil tank 21. The temperature sensor 61 is used to detect the temperature of the hydraulic oil in the oil tank 21. When the temperature of the hydraulic oil is lower than the first preset temperature value set by the user, the heater 3 is activated to heat the hydraulic oil. When the temperature of the hydraulic oil is higher than the third preset temperature value set by the user, the cooler 58 is activated to cool the hydraulic oil. The third preset temperature value is greater than the first preset temperature value.

[0058] The oil tank 21 has an internal cavity for storing hydraulic oil. A heater 3 is located within the cavity of the oil tank 21. Before replacing the hydraulic oil in the liquid-driven hydrogen compressor 1, the heater 3 is activated first. Once the hydraulic oil in the oil tank 21 is heated to a second preset temperature set by the user (the second preset temperature is higher than the first preset temperature but lower than the third preset temperature), the oil pump 22 is then activated to replace the hydraulic oil in the liquid-driven hydrogen compressor 1. This configuration ensures that when the oil pump 22 is activated, the hydraulic oil entering the oil pump 22 has a higher temperature, lower viscosity, and greater fluidity, thereby reducing the energy consumption of the oil pump 22.

[0059] The oil tank 21 is also equipped with a magnetic rod 62, which can attract metal debris in the hydraulic oil, preventing metal debris from entering the liquid-driven hydrogen compressor 1 and affecting the movement of the drive-side piston 12, and preventing metal debris from entering the liquid-driven hydrogen compressor 1 and easily causing damage to the drive-side piston 12.

[0060] The top surface or upper side of the oil tank 21 is provided with a pressure balance port that communicates with the cavity of the oil tank 21. The pressure balance port is used to allow external air to enter the cavity to balance the pressure inside and outside the oil tank 21. An air filter 63 is provided on the pressure balance port of the oil tank 21, so that the air entering the oil tank 21 must pass through the air filter 63 to prevent dust from the outside air from entering the oil tank 21 and causing impurities to mix into the hydraulic oil.

[0061] The oil tank 21 is connected to a storage tank for storing hydraulic oil via a pipeline. The hydraulic oil in the storage tank is used to replenish the hydraulic oil in the oil tank 21. A replenishment control valve 64 is installed on the pipeline between the oil tank 21 and the storage tank. A level controller 65 is also installed inside the oil tank 21, and the level controller 65 is electrically connected to the replenishment control valve 64. The level controller 65 detects the hydraulic oil level in the oil tank 21 and controls the opening and closing of the replenishment control valve 64, thereby controlling the flow of hydraulic oil between the oil tank 21 and the storage tank. When the hydraulic oil level in the oil tank 21 is lower than a set level, the level controller 65 controls the replenishment control valve 64 to open, automatically replenishing the oil tank 21 with hydraulic oil from the storage tank. When the hydraulic oil level in the oil tank 21 reaches the set level, the level controller 65 controls the replenishment control valve 64 to close, stopping the replenishment of hydraulic oil to the oil tank 21.

[0062] In one embodiment, a level gauge 66 is provided on the oil tank 21, and the user can intuitively know the amount of hydraulic oil in the oil tank 21 through the level gauge 66.

[0063] See Figure 6 The oil change assembly 4's oil change line 41 is connected to the oil tank 21 and also to at least one of the first cavity 1111 and the second cavity 1112. When the oil inlet pipe is connected to the first cavity, the oil change line is at least connected to the first cavity, so that the oil tank 21, the oil inlet pipe 24, the first cavity 1111, and the oil change line 41 form a circulation channel; or when the oil inlet pipe is connected to the second cavity, the oil change line is at least connected to the second cavity, so that the oil tank 21, the oil inlet pipe 24, the second cavity 1112, and the oil change line 41 form a circulation channel, or a circulation channel can be formed between the oil tank 21, the oil inlet pipe 24, the first cavity 1111, and the oil change line 41, as well as between the oil tank 21, the oil inlet pipe 24, the second cavity 1112, and the oil change line 41. An oil change control valve 42 is installed on the oil change pipeline 41 to control the opening and closing of the oil change pipeline 41. When it is necessary to replace the hydraulic oil in the liquid-driven hydrogen compressor 1, the oil change control valve 42 opens to connect either the first chamber 1111 or the second chamber 1112 to the oil tank 21 through the oil change pipeline 41, or to connect both the first chamber 1111 and the second chamber 1112 to the oil tank 21 through the oil change pipeline 41. When it is not necessary to replace the hydraulic oil in the liquid-driven hydrogen compressor 1, the oil change control valve 42 closes to disconnect the oil change pipeline 41 from the first chamber 1111, the second chamber 1112, and the oil tank 21, thereby allowing the hydraulic oil to push the drive-side piston 12 to move so that the liquid-driven hydrogen compressor 1 can operate normally.

[0064] Specifically, the oil change pipeline 41 includes a first oil change pipeline 411 and a second oil change pipeline 412. The two ends of the first oil change pipeline 411 are connected to the second oil port 116 of the first cavity 1111 and the oil tank 21, respectively. The two ends of the second oil change pipeline 412 are connected to the fourth oil port 118 of the second cavity 1112 and the oil tank 21. That is, the oil change pipeline 41 is connected to both the first cavity 1111 and the second cavity 1112. The oil change control valve 42 includes a first oil change control valve 421 and a second oil change control valve 422. The first oil change control valve 421 is connected in series with the first oil change pipeline 411 to control the opening and closing of the first oil change pipeline 411. The second oil change control valve 422 is connected in series with the second oil change pipeline 412 to control the opening and closing of the second oil change pipeline 412.

[0065] When the hydraulic oil in the first chamber 1111 needs to be replaced, the first oil change control valve 421 is opened, the inlet control valve 23 is switched to the state where the first interface 231 and the second interface 232 are connected, and the oil pump 22 is started, so that the hydraulic oil in the oil tank 21 enters the first chamber 1111 through the first pipe 241 to replace the hydraulic oil in the first chamber 1111. The replaced hydraulic oil flows back to the oil tank 21 through the first oil change pipe 411. When the hydraulic oil in the second chamber 1112 needs to be replaced, the second oil change control valve 422 is opened, the inlet control valve 23 is switched to the state where the first interface 231 and the third interface 233 are connected, and the oil pump 22 is started, so that the hydraulic oil in the oil tank 21 enters the second chamber 1112 through the first pipe 241 to replace the hydraulic oil in the second chamber 1112. The replaced hydraulic oil flows back to the oil tank 21 through the second oil change pipe 412. It should be noted that when replacing the hydraulic oil in the first chamber 1111, the second oil change control valve 422 can also be in the open state; when replacing the hydraulic oil in the second chamber 1112, the first oil change control valve 421 can also be in the open state. In this embodiment, the first oil change control valve 421 and the second oil change control valve 422 can both be shut-off valves, or the first oil change control valve 421 and the second oil change control valve 422 can form an integrated three-position four-way directional valve.

[0066] In one embodiment, when the liquid-driven hydrogen compressor 1 is in a stopped state, the drive-side piston 12 is exactly at the position where the volume of the first chamber 1111 is zero or the volume of the second chamber 1112 is zero. Therefore, when replacing the hydraulic oil in the liquid-driven hydrogen compressor 1, only the hydraulic oil in the corresponding chamber needs to be replaced. In this embodiment, the oil replacement pipeline 41 is connected to the corresponding chamber.

[0067] For example, the oil change line 41 is connected to the second oil port 116 of the first chamber 1111. Each time the liquid-driven hydrogen compressor 1 stops, the control valve 23 switches to the first state where the first port 231 and the second port 232 are connected. This ensures that after each shutdown, the hydraulic oil remains in the first chamber 1111, while the volume of the second chamber 1112 is zero, meaning no hydraulic oil remains in the second chamber 1112. When it is necessary to replace the hydraulic oil in the liquid-driven hydrogen compressor 1, the oil change control valve 42 is opened, the oil inlet control valve 23 is switched to the first state where the first port 231 and the second port 232 are connected, and the oil pump 22 is started, thus replacing all the hydraulic oil in the liquid-driven hydrogen compressor 1. Conversely, the oil change line 41 is connected to the fourth oil port 118 of the second chamber 1112. When the liquid-driven hydrogen compressor 1 is shut down, the oil inlet control valve 23 is switched to the second state, connecting the first interface 231 and the third interface 233. This ensures that after each shutdown, the hydraulic oil remains in the second chamber 1112, while the volume of the first chamber 1111 is zero, meaning no hydraulic oil remains in the first chamber 1111. When it is necessary to replace the hydraulic oil in the liquid-driven hydrogen compressor 1, the oil replacement control valve 42 is opened, the oil inlet control valve 23 is switched to the second state, connecting the first interface 231 and the third interface 233, and the oil pump 22 is started, thus replacing all the hydraulic oil in the liquid-driven hydrogen compressor 1.

[0068] A method for replacing hydraulic oil in a hydraulic cylinder circulation system of a liquid-driven hydrogen compressor includes the following steps:

[0069] S10: Obtain the temperature of the hydraulic oil detected by the temperature sensor 61. When the temperature of the hydraulic oil is lower than the first preset temperature value, control the heater 3 to start. The first preset temperature value is set by the user. When the temperature of the hydraulic oil is lower than the first preset temperature value, the viscosity of the hydraulic oil is high and the flow rate is low.

[0070] S20: When the temperature of the hydraulic oil is higher than the second preset temperature value or after the heater 3 has been started for a set time, control the oil change control valve 42 to open and start the oil pump 22.

[0071] The hydraulic oil temperature can be detected by temperature sensor 61 to determine if it meets the normal operating temperature requirements of the liquid-driven hydrogen compressor 1. Specifically, by acquiring the hydraulic oil temperature detected by temperature sensor 61, if the hydraulic oil temperature is higher than a second preset temperature value (the second preset temperature value is greater than the first preset temperature value; when the hydraulic oil temperature is higher than the second preset temperature value, the hydraulic oil viscosity is low and its flow is high, which is suitable for driving the liquid-driven hydrogen compressor 1 normally), the hydraulic oil in the liquid-driven hydrogen compressor 1 is replaced. Alternatively, the heating time of the hydraulic oil in the oil tank 21 by heater 3 can be used to determine if the hydraulic oil in the oil tank 21 meets the normal operating temperature requirements of the liquid-driven hydrogen compressor 1. The user-set heating time of heater 3 can be obtained through calculation. That is, based on the amount of hydraulic oil in the oil tank 21, the hydraulic oil temperature, and the power of heater 3, the time required to heat the hydraulic oil to the second preset temperature value can be calculated. The user-set heating time of heater 3 can also be obtained based on experience or experimental data.

[0072] S30: After the oil pump 22 has been in operation for a preset time, the oil change control valve 42 is closed, and the liquid-driven hydrogen compressor 1 is started. The preset operating time of the oil pump 22 can be obtained from experience or experimental data, or it can be calculated based on the volume of the liquid chamber 111 of the liquid-driven hydrogen compressor 1, the power of the oil pump 22, and the lengths of the first pipe 241, the second pipe 242, and the third pipe 243 between the oil tank 21 and the liquid-driven hydrogen compressor 1. The heater 3 can be turned off when the temperature of the hydraulic oil is higher than the second preset temperature value, after the liquid-driven hydrogen compressor 1 is started, or after the liquid-driven hydrogen compressor 1 has been started for a set time.

[0073] The above method enables automatic replacement of the cryogenic hydraulic oil in the liquid-driven hydrogen compressor 1, making operation more convenient.

[0074] In other embodiments, the user can also judge the temperature of the hydraulic oil based on experience and manually perform the oil change. For example, when the temperature is low and the liquid-driven hydrogen compressor 1 has not been working for a long time, the temperature of the hydraulic oil in the oil tank 21 is usually low, and the user can directly perform the oil change manually. For example, the heater 3 is started first. After the heater 3 has been running for a certain period of time, the oil change control valve 42 is opened and the oil pump 22 is started. After the oil pump 22 has been working for a certain period of time, the oil change control valve 42 is closed to complete the replacement of the low-temperature hydraulic oil in the liquid-driven hydrogen compressor 1, thereby starting the liquid-driven hydrogen compressor 1.

[0075] When the liquid-driven hydrogen compressor 1 needs cleaning, the user can perform a manual oil change. Specifically, connect the end of the oil change line 41 away from the liquid-driven hydrogen compressor 1 to the waste oil collection tank, then control the oil change control valve 42 to open and start the oil pump 22. Then, control the oil inlet control valve 23 to switch states so that the hydraulic oil in the oil tank 21 enters the hydraulic oil in the liquid-driven hydrogen compressor 1, thereby cleaning the liquid-driven hydrogen compressor 1.

[0076] The hydraulic cylinder circulation system of the liquid-driven hydrogen compressor of this application includes a liquid-driven hydrogen compressor 1, a hydraulic drive assembly 2, a heater 3, and an oil changing assembly 4. The hydraulic drive assembly 2 is connected to the liquid-driven hydrogen compressor 1 and provides hydraulic oil to drive the liquid-driven hydrogen compressor 1 to work. The heater 3 is connected to the oil tank 21 and heats the hydraulic oil. The oil changing assembly 4 includes an oil changing pipeline 41 and an oil changing control valve 42. The oil changing pipeline 41 is connected to at least one of the first cavity 1111 and the second cavity 1112 and the oil tank 21. The first cavity 1111 or the second cavity 1112 connected to the oil changing pipeline 41 is connected to the oil tank 21 through an oil inlet pipe 24, so that the oil tank 21, the liquid-driven hydrogen compressor 1, and the oil changing pipeline 41 form a circulation loop. The oil changing control valve 42 is provided on the oil changing pipeline 41. When the hydraulic oil temperature is low, the oil pump 22 of the heater 3 and hydraulic drive assembly 2 is started, and the oil change control valve 42 is opened. The hydraulic oil heated by the heater 3 enters the liquid-driven hydrogen compressor 1 under the action of the oil pump 22. The hydraulic oil originally located in the liquid-driven hydrogen compressor 1 is replaced by hydraulic oil at normal operating temperature through the oil change pipeline 41. This achieves the replacement of the low-temperature hydraulic oil in the liquid-driven hydrogen compressor 1 with hydraulic oil at normal operating temperature. As a result, the hydraulic oil entering the liquid-driven hydrogen compressor 1 when it starts is at normal operating temperature. Moreover, the liquid-driven hydrogen compressor 1 does not need to be started when replacing the low-temperature hydraulic oil, thus avoiding the problems of difficulty in starting the hydraulic cylinder circulation system of the liquid-driven hydrogen compressor at low temperatures and damage to the equipment.

[0077] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A hydraulic cylinder circulation system for a liquid-driven hydrogen compressor, characterized in that, include: A liquid-driven hydrogen compressor includes a cylinder, a drive-side piston, and a drive rod. The drive-side piston is movably disposed within the cylinder and divides the interior of the cylinder into a first chamber and a second chamber. The drive rod is connected to the drive-side piston. A hydraulic drive assembly includes an oil tank, an oil pump, an inlet control valve, and an inlet pipe. The inlet pipe is connected to the oil tank, a first cavity, and a second cavity. The oil pump and the inlet control valve are both connected to the inlet pipe, and the oil pump is positioned between the inlet control valve and the oil tank. The inlet control valve controls the oil tank to communicate with either the first cavity or the second cavity via the inlet pipe. A heater is installed inside the oil tank for heating the hydraulic oil inside the oil tank; An oil change assembly includes an oil change line and an oil change control valve. The oil change line connects to at least one of the first cavity and the second cavity, as well as the oil tank. When the oil inlet pipe is connected to the first cavity, the oil change line is at least connected to the first cavity; or when the oil inlet pipe is connected to the second cavity, the oil change line is at least connected to the second cavity. The oil change control valve is disposed on the oil change line to control the on / off state of the oil change line.

2. The hydraulic cylinder circulation system for a liquid-driven hydrogen compressor according to claim 1, characterized in that, The oil change pipeline is connected to both the first cavity and the second cavity, and the oil change control valve can control the connection between the first cavity and the oil tank and the connection between the second cavity and the oil tank.

3. The hydraulic cylinder circulation system for a liquid-driven hydrogen compressor according to claim 2, characterized in that, The oil change pipeline includes a first oil change pipeline and a second oil change pipeline. The first oil change pipeline connects the first cavity and the oil tank, and the second oil change pipeline connects the second cavity and the oil tank. The oil change control valve includes a first oil change control valve and a second oil change control valve. The first oil change control valve is connected in series to the first oil change pipeline to control the opening and closing of the first oil change pipeline. The second oil change control valve is connected in series to the second oil change pipeline to control the opening and closing of the second oil change pipeline.

4. The hydraulic cylinder circulation system for a liquid-driven hydrogen compressor according to claim 3, characterized in that, The cylinder body is provided with a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port and the second oil port are spaced apart and are both connected to the first cavity. The third oil port and the fourth oil port are spaced apart and are both connected to the second cavity. The first oil port and the third oil port are respectively connected to the oil inlet pipe, and the second oil port and the fourth oil port are connected to the oil change pipe.

5. The hydraulic cylinder circulation system for a liquid-driven hydrogen compressor according to claim 1, characterized in that, The oil inlet control valve is a reversing valve; the oil inlet control valve includes a first interface, a second interface, a third interface and a fourth interface; the oil inlet control valve can switch to a first state where the first interface and the second interface are connected and the third interface and the fourth interface are connected, or switch to a second state where the first interface and the third interface are connected and the second interface and the fourth interface are connected. The oil inlet pipe includes a first pipe, a second pipe, a third pipe, and a fourth pipe. The first pipe connects the oil tank and the first interface, the second pipe connects the second interface and the first cavity, the third pipe connects the third interface and the second cavity, and the fourth pipe connects the fourth interface and the oil tank. The oil pump is connected in series with the first pipeline.

6. The hydraulic cylinder circulation system for a liquid-driven hydrogen compressor according to claim 5, characterized in that, The oil inlet control valve can also be switched to a third state in which the first, second, third and fourth interfaces are not connected to each other. The hydraulic drive assembly also includes an overflow pipe and an overflow valve. The overflow pipe is connected to the first pipe and the oil tank, and the overflow valve is disposed on the overflow pipe.

7. The hydraulic cylinder circulation system for a liquid-driven hydrogen compressor according to claim 5, characterized in that, The hydraulic drive assembly also includes a check valve and an accumulator. The check valve is connected in series on the first pipeline and is located between the oil pump and the oil inlet control valve. The accumulator is connected to the first pipeline and is located between the check valve and the oil inlet control valve.

8. The hydraulic cylinder circulation system for a liquid-driven hydrogen compressor according to claim 5, characterized in that, The hydraulic drive assembly also includes a cooler, which is disposed on the fourth pipe or the oil tank.

9. The hydraulic cylinder circulation system for a liquid-driven hydrogen compressor according to claim 1, characterized in that, The hydraulic cylinder circulation system of the liquid-driven hydrogen compressor also includes a temperature sensor, which is installed inside the oil tank and is used to detect the temperature of the hydraulic oil in the oil tank.

10. The hydraulic cylinder circulation system for a liquid-driven hydrogen compressor according to claim 1, characterized in that, The oil pump includes a motor, a hydraulic pump, a pump frame, and shock absorbers. Multiple shock absorbers are spaced apart on the pump frame, and the pump frame is connected to the components for mounting the oil pump through the shock absorbers. The motor and the hydraulic pump are both fixed on the pump frame, and the shaft of the hydraulic pump is drivenly connected to the output shaft of the motor.

Images