Nitrogen charging device

Abstract

The nitrogen charging device comprises a nitrogen tank, a gas-liquid pressure cylinder, an oil tank, a power pump set, a control valve and a one-way valve. The gas-liquid pressure cylinder is connected with a gas outlet of the nitrogen tank and a gas inlet of the energy accumulator and used for converting hydraulic energy into nitrogen pressure, low-pressure nitrogen suction is achieved, and the nitrogen is pressurized and then pressed into the energy accumulator. The oil tank is used for storing hydraulic oil; the power pump set is arranged in the device and used for providing oil pressure, so that hydraulic oil in the oil tank flows into the gas-liquid pressure cylinder, and nitrogen in the gas-liquid pressure cylinder is pushed to be pressurized and enters the energy accumulator through the one-way valve. The control valve is connected with the gas-liquid pressure cylinder and the oil tank and used for releasing the oil pressure of the gas-liquid pressure cylinder when opened and establishing the oil pressure of the gas-liquid pressure cylinder when closed. According to the nitrogen charging device, when the pressure of the nitrogen tank is reduced, the nitrogen tank can still charge nitrogen into the energy accumulator, so that the nitrogen in the nitrogen tank can be fully used, waste is avoided, the labor intensity of workers is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of nitrogen filling equipment, and in particular to a nitrogen filling device. Background Art

[0002] Accumulators are widely used in hydraulic systems. With daily use, the nitrogen in the accumulator will leak, causing the nitrogen pressure to decrease. Therefore, it is necessary to replenish nitrogen to the accumulator during daily maintenance work.

[0003] Existing nitrogen charging devices generally use nitrogen charging from high-pressure nitrogen tanks to the target accumulator, and use the pressure difference to directly press the nitrogen into the accumulator. However, the nitrogen charging device has a single power source, a large volume, and is not easy to move, which is difficult for on-site use of vehicles. During the use of the existing device, once the high-pressure nitrogen tank is used many times, the pressure is reduced to the same as the nitrogen pressure in the target accumulator or slightly higher than the nitrogen pressure in the accumulator, the target accumulator will not be able to be charged with nitrogen. Although there is still a lot of nitrogen in the nitrogen tank, it can no longer be used, resulting in waste; in addition, in some special hydraulic industries, the accumulator pressure requirements are relatively high, such as requiring the accumulator pressure to reach 230 bar or above. The pressure of the commonly used nitrogen tanks on the market is only 120 bar at most, and it is impossible to charge nitrogen to the accumulator exceeding 120 bar. Therefore, in order to make full use of the nitrogen in the nitrogen tank, the pressure of the low-pressure nitrogen tank is pressed into the accumulator whose charging target exceeds the nitrogen tank. It is necessary for those skilled in the art to provide a nitrogen charging device in a timely manner that can cope with the situation where nitrogen cannot be charged on site when the nitrogen tank pressure is reduced. Utility Model Content

[0004] The purpose of the present application is to provide a nitrogen filling device, which can solve the problem that nitrogen cannot be filled when the pressure of the nitrogen tank is reduced, thereby avoiding the waste of nitrogen in the nitrogen tank and reducing production costs.

[0005] To achieve the above object, the present application provides a nitrogen charging device for charging nitrogen into an accumulator, comprising:

[0006] Nitrogen tank;

[0007] A gas-liquid booster cylinder, connecting the gas outlet of the nitrogen tank and the gas inlet of the accumulator;

[0008] The oil tank is connected to the gas-liquid booster cylinder through a power pump group or a control valve and is used to store hydraulic oil;

[0009] The power pump group is arranged in the device and is used to provide power so that the hydraulic oil in the oil tank flows into the gas-liquid booster cylinder to push the nitrogen in the gas-liquid booster cylinder into the accumulator;

[0010] The control valve connects the gas-liquid booster cylinder and the oil tank, and is used to release the oil pressure of the gas-liquid booster cylinder when opened and to establish the oil pressure of the gas-liquid booster cylinder when closed.

[0011] In some embodiments, a time relay and a controller connected to the time relay are also included. After the set time of the time relay is reached, the time relay sends a signal, and the controller controls the control valve to be powered on and closed.

[0012] In some embodiments, a first electronic pressure switch is also included, which is connected to the oil inlet line of the gas-liquid booster cylinder. The first electronic pressure switch is used to detect the pressure of the oil inlet line of the gas-liquid booster cylinder, so as to control the control valve to lose power and open through the controller when the pressure of the oil inlet line of the gas-liquid booster cylinder exceeds the set pressure of the first electronic pressure switch.

[0013] In some embodiments, a second electronic pressure switch is also included, which is connected to the air outlet pipe of the gas-liquid booster cylinder. The second electronic pressure switch is used to detect the pressure of the air outlet pipe of the gas-liquid booster cylinder, so that when the pressure of the air outlet pipe of the gas-liquid booster cylinder exceeds the set pressure of the second electronic pressure switch, the control valve is controlled by the controller to open and the power pump group is closed.

[0014] In some embodiments, the power pump group is one or both of an electric motor pump group and a diesel pump group.

[0015] In some embodiments, the motor pump group and the diesel pump group are arranged in the device and connected in parallel to the oil inlet pipeline of the gas-liquid booster cylinder.

[0016] In some embodiments, an air intake check valve and an air intake stop valve are provided on the connecting pipeline between the nitrogen tank and the gas-liquid booster cylinder, and an air outlet check valve and an air outlet stop valve are provided on the connecting pipeline between the gas-liquid booster cylinder and the accumulator.

[0017] In some embodiments, it also includes a pressure regulating pipeline and / or a safety pipeline. The pressure regulating pipeline connects the oil inlet pipeline of the gas-liquid booster cylinder and the oil tank, and a pressure regulating valve is provided on the pressure regulating pipeline. The safety pipeline connects the oil inlet pipeline of the gas-liquid booster cylinder and the oil tank, and a safety valve is provided on the safety pipeline.

[0018] In some embodiments, a throttle valve is provided on the pipeline where the control valve is located.

[0019] In some embodiments, it also includes a movable body and a box body arranged on the movable body, the nitrogen tank is arranged on the box body, and the gas-liquid booster cylinder and the oil tank are both arranged in the box body.

[0020] Compared with the above background technology, the nitrogen charging device provided in the embodiment of the present application is used to charge nitrogen into the accumulator, and the nitrogen charging device includes a nitrogen tank, a gas-liquid booster cylinder, an oil tank, a power pump group and a control valve. Among them, the gas-liquid booster cylinder connects the gas outlet of the nitrogen tank and the gas inlet of the accumulator, and the gas-liquid booster cylinder is used to convert hydraulic energy into gas energy; the oil tank is used to store hydraulic oil; the power pump group is arranged in the device, and the power pump group is used to provide power so that the hydraulic oil in the oil tank flows into the gas-liquid booster cylinder to push the nitrogen in the gas-liquid booster cylinder into the accumulator; the control valve connects the gas-liquid booster cylinder and the oil tank, and the control valve is used to release the oil pressure of the gas-liquid booster cylinder when it is opened and to establish the oil pressure of the gas-liquid booster cylinder when it is closed.

[0021] It can be understood that when the pressure of the nitrogen tank is much higher than that of the accumulator, there is no need to start the power pump group, and the accumulator can be directly charged with nitrogen; when the pressure decreases, the power pump group is started to supply oil. At this time, the control valve is controlled to open to make the oil circuit where the control valve is located unobstructed, and the nitrogen in the nitrogen tank flows into the gas-liquid booster cylinder. When the pressure is constant, the control valve is closed, and the oil enters the hydraulic cavity of the gas-liquid booster cylinder under the action of the power pump group, pushing the piston of the gas-liquid booster cylinder upward, thereby pushing the nitrogen entering the gas-liquid booster cylinder into the accumulator; after the pressure reaches a certain value, the control valve is opened again to release the pressure, and the nitrogen pushes the piston downward to store gas in the gas-liquid booster cylinder and enter the next cycle.

[0022] Compared with the traditional nitrogen charging device, the nitrogen charging device provided in the embodiment of the present application, by adding a power source, can ensure that when the pressure of the nitrogen tank is reduced, the nitrogen tank can still charge the accumulator with nitrogen. In this way, the nitrogen in the nitrogen tank can be fully utilized to avoid waste, thereby reducing the labor intensity of workers, further shortening the working time, and thus reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] FIG1 is a nitrogen filling principle diagram of a nitrogen filling device in an embodiment of the present application;

[0025] FIG2 is a schematic diagram of multiple power sources of a nitrogen charging device in an embodiment of the present application;

[0026] FIG3 is a schematic diagram of the external structure of a nitrogen filling device in an embodiment of the present application;

[0027] FIG4 is a schematic diagram of an electrical control panel of the box in FIG3 ;

[0028] FIG. 5 is a schematic diagram of the hydraulic and nitrogen integrated panel of the box in FIG. 3 .

[0029] in:

[0030] 1. Motor pump group; 2. Pump oil non-return valve; 3. Safety valve; 4. Pressure regulating valve; 5. Throttle valve; 6. Control valve; 7. First electronic pressure switch; 8. Gas-liquid booster cylinder; 9. Inlet non-return valve; 10. Outlet non-return valve; 11. Inlet stop valve; 12. Pressure gauge; 13. Second electronic pressure switch; 14. Outlet stop valve; 15. Air filter; 16. Liquid level gauge; 17. Fuel tank; 18. Suction filter; 19. Return oil filter; 20. Diesel pump group; 21. Accumulator; 22. Nitrogen tank; 23. Box; 2301-Electrical control panel; 2302-Hydraulic and nitrogen integrated panel; 24. Movable body. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] It should be noted that the directional words such as "upper end, lower end, left side, right side" described below are all defined based on the drawings in the specification.

[0034] Please refer to Figures 1 to 5, Figure 1 is a nitrogen charging principle diagram of the nitrogen charging device in the embodiment of the present application; Figure 2 is a schematic diagram of the multiple power sources of the nitrogen charging device in the embodiment of the present application; Figure 3 is a schematic diagram of the external structure of the nitrogen charging device in the embodiment of the present application; Figure 4 is a schematic diagram of the electrical control panel of the box in Figure 3; Figure 5 is a schematic diagram of the hydraulic and nitrogen comprehensive panel of the box in Figure 3.

[0035] The nitrogen charging device provided in the embodiment of the present application is used to charge nitrogen into the accumulator 21 , and the nitrogen charging device includes a nitrogen tank 22 , a gas-liquid booster cylinder 8 , an oil tank 17 , a power pump group and a control valve 6 .

[0036] Among them, the gas-liquid booster cylinder 8 connects the air outlet of the nitrogen tank 22 and the air inlet of the accumulator 21, and the gas-liquid booster cylinder 8 is used to convert hydraulic energy into gas energy; the oil tank 17 is connected to the gas-liquid booster cylinder 8 through the power pump group or the control valve 6, and the oil tank 17 is used to store hydraulic oil; the power pump group is arranged in the box body 23, and the power pump group is used to provide power so that the hydraulic oil in the oil tank 17 flows into the gas-liquid booster cylinder 8, so as to promote the nitrogen in the gas-liquid booster cylinder 8 to enter the accumulator 21; the control valve 6 connects the gas-liquid booster cylinder 8 and the oil tank 17, and the control valve 6 is used to release the oil pressure of the gas-liquid booster cylinder 8 when opened to facilitate the inflow of low-pressure nitrogen, and to establish the oil pressure of the gas-liquid booster cylinder 8 when closed to pressurize the nitrogen and input it into the accumulator.

[0037] It can be understood that when the pressure of the nitrogen tank 22 is much higher than that of the accumulator 21, there is no need to start the power pump group, and the accumulator 21 can be directly charged with nitrogen; when the pressure decreases, the power pump group is started to supply oil. At this time, the control valve 6 is opened to make the oil circuit where the control valve 6 is located unobstructed, and the nitrogen in the nitrogen tank 22 flows into the gas-liquid booster cylinder 8. When the pressure is constant, the control valve 6 is closed, and the oil enters the hydraulic cavity of the gas-liquid booster cylinder 8 under the action of the power pump group, pushing the piston of the gas-liquid booster cylinder 8 upward, thereby pushing the nitrogen entering the gas-liquid booster cylinder 8 into the accumulator 21; after the pressure reaches a certain value, the control valve 6 is opened again to release the pressure, and the nitrogen pushes the piston to move downward, thereby storing gas in the gas-liquid booster cylinder 8 and entering the next cycle.

[0038] Compared with the traditional nitrogen charging device, the nitrogen charging device provided in the embodiment of the present application, by adding a power source, can ensure that when the pressure of the nitrogen tank 22 is reduced, the nitrogen tank 22 can still charge the accumulator 21 with nitrogen. In this way, the nitrogen in the nitrogen tank 22 can be fully utilized to avoid waste, thereby reducing the labor intensity of workers, further shortening the working time, and thus reducing production costs.

[0039] In addition, the power source of the nitrogen charging device can be multiple power sources, for example, the power pump group can be one or both of the motor pump group 1 and the diesel pump group 20. Preferably, the motor pump group 1 and the diesel pump group 20 are arranged in the box body 23 and connected in parallel to the oil inlet pipeline of the gas-liquid booster cylinder 8, and the oil circuits where the motor pump group 1 and the diesel pump group 20 are located are provided with an oil pumping check valve 2. When there is an external force impact, the oil pumping check valve 2 is used to protect the motor pump group 1 or the diesel pump group 20. That is to say, the motor pump group 1 and the diesel pump group 20 can choose to provide power so that the hydraulic oil in the oil tank 17 is pumped into the gas-liquid booster cylinder 8.

[0040] In this way, when the nitrogen pressure in the accumulator 21 is insufficient, it is necessary to supplement the nitrogen pressure in the accumulator 21. The device uses a vehicle-mounted DC power supply or a battery-driven motor to drive a hydraulic pump, or uses a diesel pump group 20 to transfer hydraulic energy through the gas-liquid booster cylinder 8 to achieve the input of high-pressure nitrogen into the air bag of the target accumulator 21.

[0041] The use of multiple power sources can avoid maintenance difficulties caused by extreme situations (such as the vehicle having no generator, etc.), further reduce production and maintenance costs and workers' labor intensity, and further shorten working hours.

[0042] In some embodiments, the nitrogen filling device further includes a time relay and a controller, wherein the controller is connected to the time relay, and after the set time of the time relay is reached, the time relay sends a signal, and the controller controls the control valve 6 to be powered on and closed.

[0043] It should be noted that the control valve 6 is a solenoid valve, which is a two-position two-way solenoid valve. The solenoid valve is normally in the open state, that is, the solenoid valve is normally in the lower position, and the oil circuit is unblocked. When the solenoid valve is energized and switches to the upper position, the control valve 6 is closed and the oil circuit is disconnected. In other words, the solenoid valve establishes oil pressure when it is energized and releases oil pressure when it is de-energized.

[0044] Specifically, press the system start button, select the switch, start the motor pump group 1 or the diesel pump group 20, and at the same time, the time relay starts timing (the power-on time can be adjusted). When the time relay setting time is reached, the controller controls the solenoid valve to be powered, and the solenoid valve switches to the upper position. At this time, the solenoid valve is closed, the oil circuit is disconnected, and pressure is built up. In this way, under the power of the motor pump group 1 or the diesel pump group 20, the hydraulic oil in the oil tank 17 enters the hydraulic chamber of the gas-liquid booster cylinder 8, and the piston in the gas-liquid booster cylinder 8 begins to rise, pressing the nitrogen into the accumulator 21.

[0045] In some embodiments, the nitrogen filling device also includes a first electronic pressure switch 7 and a second electronic pressure switch 13. The first electronic pressure switch 7 is connected to the oil inlet pipeline of the gas-liquid booster cylinder 8, and the first electronic pressure switch 7 is used to detect the pressure of the oil inlet pipeline of the gas-liquid booster cylinder 8, so that when the pressure of the oil inlet pipeline of the gas-liquid booster cylinder 8 exceeds the set pressure of the first electronic pressure switch 7, the control valve 6 is controlled by the controller to lose power and open; the second electronic pressure switch 13 is connected to the air outlet pipeline of the gas-liquid booster cylinder 8, and the second electronic pressure switch 13 is used to detect the pressure of the air outlet pipeline of the gas-liquid booster cylinder 8, so that when the pressure of the air outlet pipeline of the gas-liquid booster cylinder 8 exceeds the set pressure of the second electronic pressure switch 13, the control valve 6 is controlled by the controller to lose power and open, and the power pump group is closed.

[0046] Specifically, under the power of the motor pump group 1 or the diesel pump group 20, as the hydraulic oil in the oil tank 17 is pumped into the hydraulic chamber of the gas-liquid booster cylinder 8, when the pressure in the gas-liquid booster cylinder 8 exceeds the set pressure of the first electronic pressure switch 7, the first electronic pressure switch 7 sends a signal, the solenoid valve loses power and opens, and pressure relief is achieved (pressure relief is used to allow the nitrogen in the nitrogen tank 22 to enter the gas storage chamber in the gas-liquid booster cylinder 8), and the time relay starts timing (the set time is adjustable); further, after the set time of the time relay is reached, the time relay sends a signal, the solenoid valve is powered on and closed, pressure is established, and the nitrogen in the gas-liquid booster cylinder 8 continues to be pressed into the accumulator 21. This cycle continues until the nitrogen pressure in the accumulator 21 reaches the required nitrogen filling pressure.

[0047] Finally, when the set pressure of the second electronic pressure switch 13 is reached, the second electronic pressure switch 13 sends a signal, the solenoid valve loses power and opens, the motor pump group 1 or the diesel pump group 20 is closed, and the nitrogen filling is completed.

[0048] It should be noted that the above-mentioned controller can be a PLC, and the switching function of the time relay and the control function of the PLC are contents well known to those skilled in the art, and are not the focus of protection of this application. The focus of this application is to realize the function of automatic nitrogen filling through the connection relationship between the controller, the time relay and each actuator (power pump group, control valve 6) and the dual power source.

[0049] In some embodiments, in order to ensure the stability and safety of nitrogen filling, an intake check valve 9 and an intake stop valve 11 are provided on the connecting pipeline between the nitrogen tank 22 and the gas-liquid booster cylinder 8, and an outlet check valve 10 and an outlet stop valve 14 are provided on the connecting pipeline between the gas-liquid booster cylinder 8 and the accumulator 21.

[0050] Among them, the air inlet check valve 9 only allows the nitrogen in the nitrogen tank 22 to enter the gas-liquid booster cylinder 8, and does not allow the nitrogen in the gas-liquid booster cylinder 8 to enter the nitrogen tank 22. The air outlet check valve 10 only allows the nitrogen in the gas-liquid booster cylinder 8 to enter the accumulator 21, and does not allow the nitrogen in the accumulator 21 to enter the gas-liquid booster cylinder 8. The air inlet stop valve 11 is a switch that can realize the output of nitrogen in the nitrogen tank 22, and the air outlet stop valve 14 is a switch that can realize the entry of nitrogen in the accumulator 21. A pressure gauge 12 can also be set on the pipeline between the air inlet stop valve 11 and the nitrogen tank 22 to monitor the pressure of the nitrogen tank 22 in real time.

[0051] In some embodiments, it also includes a pressure regulating pipeline and / or a safety pipeline. The pressure regulating pipeline connects the oil inlet pipeline of the gas-liquid booster cylinder 8 and the oil tank 17, and a pressure regulating valve 4 is provided on the pressure regulating pipeline. The safety pipeline connects the oil inlet pipeline of the gas-liquid booster cylinder 8 and the oil tank 17, and a safety valve 3 is provided on the safety pipeline.

[0052] Among them, the pressure regulating valve 4 is used to adjust the hydraulic system pressure (set to 27MPa), and the safety valve 3 is used to protect all components of the system and limit the maximum system pressure (31.5MPa).

[0053] In some embodiments, a throttle valve 5 is provided on the pipeline where the control valve 6 is located. The throttle valve 5 acts as a loop buffer to reduce the impact caused by pressure.

[0054] In addition, an oil suction filter 18 can be connected to the oil inlet pipeline of the power pump group, and the oil suction filter 18 can filter impurities in the hydraulic oil from entering the oil pump. A return oil filter 19 is set on the return oil pipeline of the solenoid valve, the pressure regulating valve 4, and the safety valve 3. The return oil filter 19 can filter impurities in the hydraulic system from entering the oil tank 17. At the same time, an air filter 15 is set on the oil tank 17. The air filter 15 can filter moisture in the air to prevent the hydraulic oil from emulsifying. Of course, a liquid level gauge 16 can also be set in the oil tank 17, and the liquid level gauge 16 can observe the oil level of the oil tank 17.

[0055] In some embodiments, the nitrogen charging device further includes a movable vehicle body 24 and a box body 23 disposed on the movable vehicle body 24 , the nitrogen tank 22 is disposed on the box body 23 , and the gas-liquid booster cylinder 8 and the oil tank 17 are both disposed in the box body 23 .

[0056] For ease of operation, an electrical control panel 2301 is provided on the box body 23, and the electrical control panel 2301 has:

[0057] "Motor on" switch: can start motor pump group 1;

[0058] "Motor off" switch: can turn off motor pump group 1;

[0059] "Power indicator light": When the motor pump group 1 is started, the power indicator light is on; when the motor pump group 1 is shut down, the power indicator light is off;

[0060] "Solenoid valve energized and de-energized" switch: can control whether the hydraulic unit builds up pressure;

[0061] "Emergency stop switch": When encountering an emergency, you can press the emergency stop switch to stop the equipment immediately;

[0062] “Manual to automatic switch”: can switch between manual and automatic operation modes.

[0063] The box 23 is also provided with a hydraulic and nitrogen integrated panel 2302, which is provided with:

[0064] "Oil pressure" display meter: can observe the oil pressure and set the pressure switch signal;

[0065] "Pressure regulating valve": can adjust the oil pressure;

[0066] "Accumulator pressure" display: can observe the nitrogen pressure in the accumulator 21 and set the pressure switch signal;

[0067] "Nitrogen tank / bottle pressure" display: can observe the pressure of nitrogen tank 22;

[0068] “Connect nitrogen source”: connect to the air inlet of the gas-liquid booster cylinder 8;

[0069] "Connect to accumulator": connect to the outlet of the gas-liquid booster cylinder 8;

[0070] “Gas outlet stop valve”: to prevent nitrogen leakage when disassembling the accumulator 21;

[0071] “Inlet stop valve”: can open and close the nitrogen cylinder.

[0072] The nitrogen filling process is described in detail below:

[0073] 1. Before nitrogen filling, connect one end of a long tube to the gas outlet on the panel of the box 23, and the other end to the accumulator 21; connect one end of a short tube to the gas inlet on the panel of the box 23, and the other end to the nitrogen tank 22.

[0074] 2. Check the air outlet stop valve 14 and the air inlet stop valve 11, and keep them both open at this time.

[0075] 3. The pressure of the pressure regulating valve 4 has been set and cannot be adjusted without authorization, otherwise the consequences will be at your own risk.

[0076] 4. Press the power button on the panel, the device starts running and the power indicator light is always on.

[0077] ① The oil pressure electromagnetic switch does not need to be adjusted;

[0078] ② Nitrogen tank 22 pressure displays the nitrogen tank 22 pressure;

[0079] ③ The pressure of the accumulator 21 must be adjusted according to the required pressure (when the operation indicator light is on, press the on / off key, press the SET key, when the lower limit indicator light is on, set the lower limit value according to the required pressure, the lower limit value is the required pressure of the nitrogen tank 22, set it, press the SET key, when the upper limit indicator light is on, set the upper limit value according to the required pressure, the upper limit value is greater than the required pressure by 10kg / cm², setting is complete). The indicator light is on, indicating that the pressure can be set at this time.

[0080] ④ After nitrogen charging is completed, first close the nitrogen tank 22, then loosen the top needle of the nitrogen charging head of the accumulator 21 to discharge the residual pressure (open the exhaust port of the nitrogen charging head), and finally remove the hose.

[0081] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0082] The above is a detailed introduction to the nitrogen filling device provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the scheme and its core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A nitrogen charging device for charging nitrogen into an accumulator, characterized in that: include: Nitrogen tank; A gas-liquid booster cylinder, connecting the gas outlet of the nitrogen tank and the gas inlet of the accumulator; An oil tank connected to the gas-liquid booster cylinder via a power pump group or a control valve, and used for storing hydraulic oil; A power pump group is arranged in the device and is used to provide power so that the hydraulic oil in the oil tank flows into the gas-liquid booster cylinder to push the nitrogen in the gas-liquid booster cylinder to enter the accumulator; The control valve connects the gas-liquid booster cylinder and the oil tank, and is used to release the oil pressure of the gas-liquid booster cylinder when opened to facilitate the inflow of low-pressure nitrogen, and to establish the oil pressure of the gas-liquid booster cylinder when closed to pressurize the nitrogen and input it into the accumulator.

2. The nitrogen filling device according to claim 1, characterized in that: It also includes a time relay and a controller connected to the time relay. After the set time of the time relay is reached, the time relay sends a signal, and the controller controls the control valve to be powered on and closed.

3. The nitrogen filling device according to claim 2, characterized in that: It also includes a first electronic pressure switch, which is connected to the oil inlet pipeline of the gas-liquid booster cylinder. The first electronic pressure switch is used to detect the pressure of the oil inlet pipeline of the gas-liquid booster cylinder so as to control the control valve to open by the controller when the pressure of the oil inlet pipeline of the gas-liquid booster cylinder exceeds the set pressure of the first electronic pressure switch.

4. The nitrogen filling device according to claim 2, characterized in that: It also includes a second electronic pressure switch, which is connected to the air outlet pipe of the gas-liquid booster cylinder. The second electronic pressure switch is used to detect the pressure of the air outlet pipe of the gas-liquid booster cylinder, so that when the pressure of the air outlet pipe of the gas-liquid booster cylinder exceeds the set pressure of the second electronic pressure switch, the control valve is controlled by the controller to open and the power pump group is closed.

5. The nitrogen filling device according to any one of claims 1 to 4, characterized in that: The power pump group is one or both of a motor pump group and a diesel pump group.

6. The nitrogen filling device according to claim 5, characterized in that: The motor pump group and the diesel pump group are arranged in the device and connected in parallel to the oil inlet pipeline of the gas-liquid boosting cylinder.

7. The nitrogen filling device according to claim 1, characterized in that: An air inlet check valve and an air inlet stop valve are arranged on the connecting pipeline between the nitrogen tank and the gas-liquid booster cylinder, and an air outlet check valve and an air outlet stop valve are arranged on the connecting pipeline between the gas-liquid booster cylinder and the accumulator.

8. The nitrogen filling device according to claim 1, characterized in that: It also includes a pressure regulating pipeline and / or a safety pipeline, wherein the pressure regulating pipeline connects the oil inlet pipeline of the gas-liquid booster cylinder and the oil tank, and a pressure regulating valve is provided on the pressure regulating pipeline; the safety pipeline connects the oil inlet pipeline of the gas-liquid booster cylinder and the oil tank, and a safety valve is provided on the safety pipeline.

9. The nitrogen filling device according to claim 1, characterized in that: A throttle valve is arranged on the pipeline where the control valve is located.

10. The nitrogen filling device according to claim 1, characterized in that: It also includes a movable vehicle body and a box body arranged on the movable vehicle body, the nitrogen tank is arranged on the box body, and the gas-liquid booster cylinder and the oil tank are both arranged in the box body.

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