Nitrogen charging and discharging system for energy accumulator

Abstract

The invention relates to the technical field of energy storage, in particular to a nitrogen charging and discharging system for energy accumulators, comprising: an energy storage unit comprising a plurality of energy accumulators and a plurality of nitrogen charging devices connected with the energy accumulators, each nitrogen charging device comprising a driver, a push rod and a valve body, the push rod being driven by the driver for plugging or opening the valve body; the nitrogen matrix comprises a plurality of nitrogen cylinders and a plurality of stop valves arranged on the opening sides of the nitrogen cylinders; the pressurizing unit comprises a pressurizing mechanism and one-way valve sets arranged on the upstream and downstream of the pressurizing mechanism, the input end of the pressurizing mechanism is connected to the nitrogen matrix, and the output end of the pressurizing mechanism is connected to the nitrogen charging device. According to the scheme, the defect that in the prior art, manual operation is tedious in the nitrogen charging and deflating process of an energy accumulator in a hydraulic system is overcome, automatic nitrogen charging and deflating are achieved, and the charging efficiency and the system operation stability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of energy storage, and in particular to an accumulator nitrogen charging and discharging system. Background Art

[0002] As an important energy storage component in the hydraulic system, the accumulator needs to be pre-filled with nitrogen at a certain pressure during its operation to ensure the normal operation of the system.

[0003] Traditional nitrogen filling methods usually involve manual operation, that is, connecting the high-pressure nitrogen cylinder to the input end of the booster (such as a pneumatic or gas-liquid booster) through a pipeline, and then connecting the output end of the booster to the nitrogen filling tool through a pipeline, and finally the nitrogen filling tool is directly connected to the charging port of the accumulator.

[0004] For accumulators with large capacity and high pressure requirements, due to the limited capacity of a single nitrogen bottle, a booster device is often required to meet higher pressure requirements, and the nitrogen bottle may need to be replaced frequently to complete the entire charging process. This process is not only inefficient, but also increases the frequency of manual intervention, resulting in a low degree of automation. Summary of the invention

[0005] The present invention provides an accumulator nitrogen charging and discharging system, which is used to solve the defect of cumbersome manual operation in the nitrogen charging and discharging process of the accumulator in the hydraulic system in the prior art, realizes automatic nitrogen charging and discharging, and improves the charging efficiency and the stability of the system operation.

[0006] The present invention provides an accumulator nitrogen charging and discharging system, comprising: an energy storage unit, comprising a plurality of accumulators and a plurality of nitrogen charging devices connected to the accumulators, the nitrogen charging devices comprising a driver, a push rod and a valve body, the push rod being driven by the driver and used for blocking or opening the valve body; a nitrogen matrix, comprising a plurality of nitrogen cylinders and a plurality of stop valves arranged on the opening sides of the nitrogen cylinders; a boosting unit, comprising a boosting mechanism and a one-way valve group arranged upstream and downstream of the boosting mechanism, the input end of the boosting mechanism being connected to the nitrogen matrix, and the output end of the boosting mechanism being connected to the nitrogen charging device.

[0007] According to one embodiment of the present invention, the driver is a linear stepping motor; the linear stepping motor is equipped with an encoder to detect the linear displacement of the push rod in real time.

[0008] According to one embodiment of the present invention, a temperature sensor is provided on the accumulator for monitoring the temperature change of the accumulator during the nitrogen charging process.

[0009] According to one embodiment of the present invention, the energy storage unit includes a plurality of first gas-controlled one-way valves connected to the valve body of the nitrogen charging device, wherein the outlet side of the first gas-controlled one-way valve faces the nitrogen charging device, and is used to prevent the gas loss of the accumulator in a closed state; a first pressure sensor is provided on the valve body, and is used to monitor and feedback the pressure state of the accumulator in real time.

[0010] According to one embodiment of the present invention, the nitrogen matrix includes a second gas-controlled one-way valve, the outlet side of the second gas-controlled one-way valve faces the nitrogen bottle, and is used to prevent the gas loss of the nitrogen matrix in a closed state; a second pressure sensor is arranged between the stop valve and the second gas-controlled one-way valve, and is used to monitor and feedback the pressure state of the nitrogen bottle in real time.

[0011] According to one embodiment of the present invention, a third gas-controlled one-way valve is provided on the pipeline between the energy storage unit and the boosting unit, and the inlet side of the third gas-controlled one-way valve is connected to the nitrogen recovery system.

[0012] According to one embodiment of the present invention, a straight pipeline is further provided between the energy storage unit and the nitrogen matrix, the straight pipeline is connected in parallel with the boosting unit, and a one-way valve with its outlet side facing the nitrogen matrix is ​​provided on the straight pipeline; the boosting unit includes a fourth gas-controlled one-way valve, the inlet side of the fourth gas-controlled one-way valve is connected to the inlet end of the boosting mechanism, and the outlet side of the fourth gas-controlled one-way valve faces the nitrogen matrix; the straight pipeline is provided with a fifth gas-controlled one-way valve, and the outlet side of the fifth gas-controlled one-way valve faces the energy storage unit.

[0013] According to one embodiment of the present invention, the boosting unit includes at least two groups of boosting mechanisms operating alternately.

[0014] According to one embodiment of the present invention, the boosting mechanism includes an oil pump, an electromagnetic reversing valve and a boosting cylinder; the oil pump is used to output hydraulic flow; the electromagnetic reversing valve is arranged between the oil pump and the boosting cylinder, and the electromagnetic reversing valve is respectively connected to the rod chamber and the rodless chamber of the boosting cylinder.

[0015] According to one embodiment of the present invention, the boost mechanism further comprises: a safety valve disposed downstream of the oil pump; and / or a cooler disposed on an oil return path of the boost mechanism.

[0016] The accumulator nitrogen charging and discharging system provided by the present invention realizes efficient and safe nitrogen filling and releasing by integrating an energy storage unit, a nitrogen matrix and a boosting unit. The energy storage unit includes a plurality of accumulators and their matching nitrogen charging devices, each of which contains a push rod operated by a driver to block or open a valve body, thereby realizing precise control of the nitrogen inlet and outlet; the nitrogen matrix is ​​composed of a number of nitrogen cylinders with stop valves; the boosting unit includes a boosting mechanism and a one-way valve group arranged upstream and downstream thereof, which is responsible for compressing the low-pressure nitrogen to the high pressure required by the accumulator, and ensuring that the nitrogen flows in a predetermined direction to prevent backflow. This system not only simplifies the traditional manual nitrogen charging process, greatly improves the nitrogen charging efficiency and the safety of operation, but also reduces maintenance costs and time, making the operation of the entire hydraulic system more reliable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a modular schematic diagram of the accumulator nitrogen charging and discharging system provided by the present invention.

[0019] Figure 2 It is a structural schematic diagram of a nitrogen charging device of an accumulator nitrogen charging and discharging system provided by the present invention.

[0020] Reference numerals: 10. Nitrogen charging device; 11. Driver; 12. Push rod; 13. Valve body; 14. First pressure sensor; 15. Temperature sensor; 21. Nitrogen cylinder; 22. Stop valve; 23. Second pressure sensor; 31. First gas-controlled one-way valve; 32. Second gas-controlled one-way valve; 33. Third gas-controlled one-way valve; 34. Fourth gas-controlled one-way valve; 35. Fifth gas-controlled one-way valve; 40. Straight-through pipeline; 51. Oil pump; 52. Solenoid reversing valve; 53. Booster cylinder; 54. Safety valve; 55. Cooler. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0023] Combine the following Figure 1 to Figure 2 The specific embodiment of the accumulator nitrogen charging and discharging system of the present invention is described.

[0024] like Figure 1 and Figure 2 As shown, the present invention provides an accumulator nitrogen charging and discharging system, comprising: an energy storage unit, comprising a plurality of accumulators and a plurality of nitrogen charging devices 10 connected to the accumulators, the nitrogen charging device 10 comprising a driver 11, a push rod 12 and a valve body 13, the push rod 12 is driven by the driver 11, and is used to block or open the valve body 13; a nitrogen matrix, comprising a plurality of nitrogen bottles 21 and a plurality of stop valves 22 arranged on the opening sides of the nitrogen bottles 21; a booster unit, comprising a booster mechanism and a one-way valve group arranged upstream and downstream of the booster mechanism, the input end of the booster mechanism is connected to the nitrogen matrix, and the output end of the booster mechanism is connected to the nitrogen charging device 10.

[0025] Specifically, the energy storage unit includes a plurality of accumulators and their supporting nitrogen charging devices 10, each of which contains a push rod 12 operated by a driver 11 to block or open a valve body 13, so as to achieve precise control of the nitrogen inlet and outlet; the nitrogen matrix is ​​preferably composed of a plurality of nitrogen bottles 21 with stop valves 22; the booster unit includes a booster mechanism and a one-way valve group arranged upstream and downstream thereof, which is responsible for compressing the low-pressure nitrogen to the high pressure required by the accumulator, and ensuring that the nitrogen flows in a predetermined direction to prevent backflow. The system is suitable for a hydraulic test system that needs to adjust the nitrogen charging pressure of the accumulator frequently, and the number of nitrogen charging devices 10, nitrogen bottles 21 and the specifications of the booster unit to be installed are determined according to the number and volume of the system accumulators. Preferably, the nitrogen charging device 10, the nitrogen matrix and the booster unit can be conveniently combined and moved through a modular design, so as to achieve application in a variety of scenarios, thereby enhancing the flexibility and adaptability of the system.

[0026] The accumulator nitrogen charging and discharging system may also include a measurement and control unit, which may include a host computer software, a slave computer PLC (programmable logic controller), and various sensors for real-time acquisition and monitoring of key parameters such as temperature and pressure, and for automated control of each unit. Specifically, the measurement and control unit can monitor all variables in the entire nitrogen charging and discharging process, such as nitrogen pressure, temperature changes, and the status of each valve, to ensure the safety and accuracy of the operation. In addition, the nitrogen charging rate can be automatically adjusted or an alarm can be triggered according to preset conditions, further improving the intelligence and reliability of the system. Through the host computer software, users can remotely monitor and manage the nitrogen charging process, obtain real-time data reports, and optimize the operating process, thereby significantly improving work efficiency and reducing the possibility of human errors.

[0027] According to an accumulator nitrogen charging and discharging system of the present invention, the driver 11 is a linear stepper motor; the linear stepper motor is equipped with an encoder to detect the linear displacement of the push rod 12 in real time. Specifically, the linear stepper motor achieves precise positioning and speed control of the movement of the push rod 12 by precisely controlling the number and frequency of current pulses. The built-in encoder can feedback the actual position information of the push rod 12 to ensure that it moves accurately according to the preset instructions, thereby reliably blocking or opening the valve body 13. The high-resolution displacement data provided by the encoder not only enhances the response accuracy of the system, but also enables the system to detect and compensate for any possible mechanical errors or external interference, ensuring the consistency and reliability of long-term operation.

[0028] In addition, the nitrogen charging device 10 opens the valve body 13 through a stepper motor, which significantly reduces the need for manual operation. The encoder built into the linear stepper motor can calculate the step distance through linear displacement, accurately control the distance the motor extends and retracts, and realize closed-loop precise control. This design allows the system to automatically adjust the opening size as needed, flexibly adjust the flow rate, and optimize the nitrogen charging process. Especially in hydraulic systems, when the system pressure changes, the corresponding accumulator nitrogen charging pressure should also be adjusted accordingly to achieve the best effect. At the same time, considering the impact of changes in weather temperature on the use effect of the accumulator, the nitrogen charging system of the present invention can dynamically adjust the nitrogen charging pressure according to environmental conditions to ensure the stability and performance of the system.

[0029] In order to adapt to different application scenarios and technical requirements, the driver 11 of the nitrogen filling device 10 can be not only a linear stepper motor, but also a proportional electromagnet. The proportional electromagnet can also provide precise opening control to meet the system's flexibility requirements for flow regulation.

[0030] According to an accumulator nitrogen charging and discharging system of the present invention, a temperature sensor 15 is provided on the accumulator for monitoring the temperature change of the accumulator during the nitrogen charging process. Specifically, the temperature sensor 15 collects temperature data inside or on the surface of the accumulator in real time, and feeds this information back to the measurement and control unit of the system. By continuously monitoring temperature changes, the system can prevent thermal stress damage, that is, when rapid pressure changes cause temperature fluctuations, the nitrogen charging rate is adjusted in time to avoid damage to the accumulator material; at the same time, the nitrogen charging rate is optimized, and the nitrogen charging speed is dynamically adjusted based on temperature feedback to ensure a safe and efficient nitrogen charging process, such as automatically slowing down the nitrogen charging speed when it is detected that the temperature rises too fast.

[0031] Because the gas compression during the charging process will cause the accumulator temperature to rise, when the temperature exceeds a certain threshold (such as 50°C), the system should stop charging and allow natural cooling, and then continue charging after the temperature drops to a safe range. This mechanism not only protects the accumulator from high temperature damage, but also ensures the safety and efficiency of the nitrogen charging process.

[0032] In addition, the temperature sensor 15 also ensures gas quality, maintains the best state of nitrogen by precisely controlling the temperature, and improves the working efficiency and reliability of the accumulator; realizes automatic control, combines with PLC (programmable logic controller) or host computer software, and uses temperature data to trigger preset actions or alarms, such as automatically stopping nitrogen filling or issuing a warning to notify maintenance personnel when the temperature exceeds the set range; supports data analysis and predictive maintenance, and the temperature data accumulated over a long period of time can be used to analyze the health status of the accumulator, help predict potential failures and arrange preventive maintenance, and reduce unexpected downtime.

[0033] According to an accumulator nitrogen charging and discharging system of the present invention, the energy storage unit includes a plurality of first gas-controlled one-way valves 31 connected to the valve body 13 of the nitrogen charging device 10, the outlet side of the first gas-controlled one-way valve 31 faces the nitrogen charging device 10, and is used to prevent the gas loss of the accumulator in the closed state; the valve body 13 is provided with a first pressure sensor 14, which is used to monitor and feedback the pressure state of the accumulator in real time. Specifically, in the energy storage unit, the inlet side of the first gas-controlled one-way valve 31 faces away from the nitrogen charging device 10, and the outlet side faces the nitrogen charging device 10. When the first gas-controlled one-way valve 31 is in the closed state, it works as a traditional one-way valve to prevent the high-pressure gas in the accumulator from flowing out through the nitrogen charging device 10 in the reverse direction, ensuring that the gas will not be accidentally lost during non-nitrogen charging or shutdown. When gas recovery or system maintenance is required, the first gas-controlled one-way valve 31 is opened by a control signal to allow the gas to flow in both directions, so that the excess nitrogen can be safely recovered from the accumulator to the nitrogen recovery system, or the gas can be allowed to return to the nitrogen charging device 10 under certain circumstances. In addition, the first pressure sensor 14 provided on the nitrogen charging device 10 can continuously monitor the actual pressure value in the accumulator and transmit the data to the measurement and control unit in real time to ensure the safety and accuracy of the nitrogen charging process.

[0034] According to an accumulator nitrogen charging and discharging system of the present invention, the nitrogen matrix includes a second gas-controlled one-way valve 32, the outlet side of the second gas-controlled one-way valve 32 faces the nitrogen cylinder 21, and is used to prevent the gas loss of the nitrogen matrix in the closed state; a second pressure sensor 23 is arranged between the stop valve 22 and the second gas-controlled one-way valve 32, which is used to monitor and feedback the pressure state of the nitrogen cylinder 21 in real time. Preferably, the nitrogen matrix is ​​a plurality of nitrogen cylinders 21 connected in parallel, and the gas-controlled one-way valve is used as the total output control switch of all nitrogen cylinders 21, and the stop valve 22 of each nitrogen cylinder 21 controls the opening and closing of each nitrogen cylinder 21 separately.

[0035] Specifically, the nitrogen matrix is ​​composed of a plurality of nitrogen cylinders 21 to form a whole. The nitrogen matrix includes a second gas-controlled one-way valve 32, whose inlet side faces away from the nitrogen matrix (i.e., toward the outside) and whose outlet side faces the inside of the nitrogen matrix. In the closed state, the second gas-controlled one-way valve 32 prevents nitrogen from being lost from the nitrogen matrix, ensuring that nitrogen does not flow back into other parts of the system during non-use or when the nitrogen cylinder 21 is switched. Each nitrogen cylinder 21 is equipped with a separate stop valve 22, which can independently control the opening and closing of each nitrogen cylinder 21, thereby realizing flexible gas supply management. A second pressure sensor 23 is arranged between the stop valve 22 and the second gas-controlled one-way valve 32, which is used to monitor the pressure state of the nitrogen matrix in real time and feed the data back to the measurement and control unit.

[0036] According to an accumulator nitrogen charging and discharging system of the present invention, a third gas-controlled one-way valve 33 is provided on the pipeline between the energy storage unit and the boosting unit, and the inlet side of the third gas-controlled one-way valve 33 is connected to the nitrogen recovery system. Specifically, a third gas-controlled one-way valve 33 is provided on the pipeline between the energy storage unit and the boosting unit, and its inlet side is connected to the nitrogen recovery system, and the outlet side faces the boosting unit. Under normal operating conditions, the third gas-controlled one-way valve 33 is in a closed state and works as a traditional one-way valve to ensure that nitrogen can only flow from the boosting unit to the energy storage unit, and cannot flow back to the boosting unit, thereby preventing pressure fluctuations and possible damage to the boosting equipment. When nitrogen recovery or system maintenance is required, the third gas-controlled one-way valve 33 is opened by a control signal to allow two-way flow of gas, so that excess nitrogen can be safely recovered from the energy storage unit to the nitrogen recovery system, or in certain circumstances, nitrogen can be allowed to return to the system from the nitrogen recovery system, thereby supporting the flexibility and versatility of the system.

[0037] According to an accumulator nitrogen charging and discharging system of the present invention, a straight-through pipeline 40 is further provided between the energy storage unit and the nitrogen matrix, the straight-through pipeline 40 is connected in parallel with the boosting unit, and a one-way valve with the outlet side facing the nitrogen matrix is ​​provided on the straight-through pipeline 40; the boosting unit includes a fourth gas-controlled one-way valve 34, the inlet side of the fourth gas-controlled one-way valve 34 is connected to the inlet end of the boosting mechanism, and the outlet side of the fourth gas-controlled one-way valve 34 faces the nitrogen matrix; the straight-through pipeline 40 is provided with a fifth gas-controlled one-way valve 35, and the outlet side of the fifth gas-controlled one-way valve 35 faces the energy storage unit. The accumulator nitrogen charging and discharging system of this embodiment allows the gas flow path to be flexibly selected according to actual needs, and an efficient nitrogen filling and recovery process is achieved by precisely controlling each gas-controlled one-way valve and the nitrogen charging device 10.

[0038] Specifically, when the accumulator is newly installed, the upper computer software controls the PLC to open the second gas-controlled one-way valve 32 of the nitrogen matrix, the fourth gas-controlled one-way valve 34 of the booster unit, and the first gas-controlled one-way valve 31 in front of each nitrogen-charging device 10, and controls the driver 11 of each nitrogen-charging device 10 to push the push rod 12 to open the valve body 13. At this time, the high-pressure nitrogen (generally 13-15MPa) in the nitrogen cylinder 21 automatically passes through the booster unit in the standby state and enters the accumulator until the pressure of the nitrogen cylinder 21 and the accumulator is equal.

[0039] When the above process is completed or the pressure of the accumulator is higher than the pressure of the nitrogen bottle 21, the PLC controls the boosting unit to start, and the low-pressure nitrogen in the nitrogen matrix is ​​boosted and pushed into the accumulator. After the first pressure sensor 14 detects the target pressure, the system stops nitrogen filling, the nitrogen filling device 10 retracts the stepper motor push rod 12, closes the valve body 13 of the nitrogen filling device 10, stops the boosting unit, and closes the second gas-controlled one-way valve 32 and the fourth gas-controlled one-way valve 34. Next, open the third gas-controlled one-way valve 33 to remove the excess pressure in the system, and finally close all open gas-controlled one-way valves to ensure that the system is in a safe state.

[0040] When it is necessary to reduce the accumulator pressure for nitrogen recovery, the valve body 13 is opened by controlling the nitrogen charging device 10, and the first pressure sensor 14 detects the pressure change, and then opens the first gas-controlled one-way valve 31, the fourth gas-controlled one-way valve 34 and the fifth gas-controlled one-way valve 35 in front of each accumulator, so that the nitrogen is reversely charged to the nitrogen bottle 21 along the straight pipeline 40. The second pressure sensor 23 monitors the pressure of the nitrogen bottle 21 in real time. When the pressure of the nitrogen bottle 21 reaches the rated pressure, the fourth gas-controlled one-way valve 34 and the fifth gas-controlled one-way valve 35 are closed to prevent overpressure. If it is necessary to further release nitrogen to reach the target pressure, the nitrogen can also be released by opening the third gas-controlled one-way valve 33 until the requirements are met. In this way, the system realizes an efficient and safe nitrogen recovery function, ensuring the effective use of resources and environmental friendliness.

[0041] Through this solution, the nitrogen filling and deflation process of the accumulator is highly automated. Only when the nitrogen in the nitrogen cylinder 21 matrix is ​​exhausted and needs to be replaced, the operator needs to manually open or close the stop valve 22, which significantly reduces the direct contact between the operator and the high-pressure nitrogen cylinder 21, not only improving safety, but also greatly improving work efficiency. The automated control system takes over most of the operations, ensuring the accuracy and stability of the nitrogen filling and deflation process, reducing the risk of human error, and simplifying daily maintenance work.

[0042] According to an accumulator nitrogen charging and discharging system of the present invention, the boosting unit includes at least two groups of boosting mechanisms that operate alternately. Preferably, the boosting unit of this solution includes multiple gas-liquid boosting cylinders 53 in parallel, and the action interval time of the multiple boosting cylinders 53 is controlled by PLC (programmable logic controller) to achieve a continuous boosting process. PLC accurately controls the working cycle of each boosting cylinder 53 to ensure that they start and stop in turn at the optimal time interval, thereby providing a stable and continuous supply of high-pressure nitrogen. This method not only improves the boosting efficiency, but also reduces the mechanical stress caused by frequent starting and stopping, and further enhances the reliability and durability of the system.

[0043] Further, according to an accumulator nitrogen charging and discharging system of the present invention, the boosting mechanism includes an oil pump 51, an electromagnetic reversing valve 52 and a boosting cylinder 53; the oil pump 51 is used to output hydraulic flow; the electromagnetic reversing valve 52 is arranged between the oil pump 51 and the boosting cylinder 53, and the electromagnetic reversing valve 52 is respectively connected to the rod chamber and the rodless chamber of the boosting cylinder 53. Specifically, the hydraulic flow provided by the oil pump 51 drives the boosting cylinder 53 to convert the pressure and compress the low-pressure nitrogen to the required high-pressure state. The electromagnetic reversing valve 52 is responsible for controlling the flow direction of the hydraulic oil and controlling the movement direction of the piston of the boosting cylinder 53 by changing the direction of the oil circuit. When the electromagnetic reversing valve 52 switches to the rod chamber return oil position, the piston of the boosting cylinder 53 is pushed to compress the nitrogen; and when the electromagnetic reversing valve 52 switches to the rodless chamber return oil position, the piston returns to prepare for the next compression. Through this precise hydraulic control system, the boosting mechanism can efficiently and stably complete the nitrogen boosting task and meet the accumulator's demand for high-pressure nitrogen.

[0044] When the initial nitrogen filling process is completed or the accumulator pressure is higher than the pressure of the nitrogen bottle 21, the system starts the oil pump 51 through PLC control, and controls the action of the electromagnetic reversing valve 52 through time to ensure the alternating operation of the booster cylinder 53. Specifically, while one booster cylinder 53 is pushing the cylinder, the other booster cylinder 53 performs the cylinder closing action, thereby realizing the uninterrupted filling process of nitrogen. The booster cylinder 53 compresses the low-pressure nitrogen and pushes it into the accumulator, ensuring a stable supply of high-pressure nitrogen. When the first pressure sensor 14 detects that the accumulator has reached the target pressure, the system automatically stops the nitrogen filling process. At this time, the nitrogen charging device 10 retracts the push rod 12, closes the valve body 13, stops the action of the electromagnetic reversing valve 52, and turns off the oil pump 51. Subsequently, the system closes the fourth gas-controlled one-way valve 34 and the fifth gas-controlled one-way valve 35, and opens the third gas-controlled one-way valve 33 to remove the excess pressure in the system. Finally, all previously opened gas-controlled one-way valves are closed to ensure that the system is in a safe state.

[0045] Further, according to an accumulator nitrogen charging and discharging system of the present invention, the boosting mechanism further includes: a safety valve 54, which is arranged downstream of the oil pump 51; and / or a cooler 55, which is arranged on the oil return path of the boosting mechanism. Among them, the safety valve 54 is arranged downstream of the oil pump 51 to prevent the hydraulic pressure in the system from being too high and ensure the safety of operation. When the system pressure exceeds the preset safety threshold, the safety valve 54 automatically opens to release excess hydraulic oil to avoid damage to key components such as the oil pump 51, the electromagnetic reversing valve 52 and the boosting cylinder 53. The cooler 55 is arranged on the oil return path of the boosting mechanism to reduce the temperature of the hydraulic oil and prevent the oil temperature from being too high during long-term operation. The hydraulic system will generate heat during the boosting process. If the heat is not dissipated in time, the high temperature may cause problems such as the degradation of hydraulic oil performance and aging of seals, affecting the stability and efficiency of the system. The cooler 55 maintains the hydraulic oil in a suitable working temperature range by forcibly cooling the return oil, thereby ensuring the long-term stable operation of the system and extending the service life of the hydraulic oil and related components.

[0046] The present invention realizes the comprehensive automation of nitrogen filling, recovery and deflation processes, significantly reduces manual operation, and improves personnel safety and work efficiency. By using an encoded stepper motor to accurately control the opening and closing of the valve body 13 of the nitrogen filling device 10, the problem of damage to the valve body 13 or inaccurate resetting is avoided, ensuring the accuracy and reliability of the operation. The entire nitrogen filling pipeline design does not need to overcome the resistance of the one-way valve, making the nitrogen filling process smoother, reducing the pressure fluctuation caused by pushing the one-way valve, and further improving the stability and safety of the system. In addition, the system supports the recycling and reuse of nitrogen, which not only saves resources but also reduces operating costs. Key components such as the nitrogen filling device 10 and the booster cylinder 53 in the system can be flexibly configured according to specific needs, enhancing the adaptability and expansibility of the system. This modular design enables the system to quickly respond to different application scenarios and working conditions, providing higher flexibility and convenience.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An accumulator nitrogen charging and discharging system, characterized in that: include: An energy storage unit, comprising a plurality of accumulators and a plurality of nitrogen charging devices connected to the accumulators, wherein the nitrogen charging devices comprise a driver, a push rod and a valve body, wherein the push rod is driven by the driver and is used to block or open the valve body; A nitrogen matrix, comprising a plurality of nitrogen cylinders and a plurality of stop valves disposed on the opening sides of the nitrogen cylinders; The boosting unit comprises a boosting mechanism and a one-way valve group arranged upstream and downstream of the boosting mechanism, wherein the input end of the boosting mechanism is connected to the nitrogen matrix, and the output end of the boosting mechanism is connected to the nitrogen charging device.

2. The accumulator nitrogen charging and discharging system according to claim 1, characterized in that: The driver is a linear stepping motor; The linear stepper motor is equipped with an encoder to detect the linear displacement of the push rod in real time.

3. The accumulator nitrogen charging and discharging system according to claim 1, characterized in that: The accumulator is provided with a temperature sensor for monitoring the temperature change of the accumulator during the nitrogen charging process.

4. The accumulator nitrogen charging and discharging system according to claim 1, characterized in that: The energy storage unit comprises a plurality of first gas-controlled one-way valves connected to the valve body of the nitrogen charging device, wherein the outlet side of the first gas-controlled one-way valve faces the nitrogen charging device and is used to prevent the gas from being lost from the accumulator in a closed state; The valve body is provided with a first pressure sensor for real-time monitoring and feedback of the pressure state of the accumulator.

5. The accumulator nitrogen charging and discharging system according to claim 1, characterized in that: The nitrogen matrix comprises a second gas-controlled one-way valve, the outlet side of the second gas-controlled one-way valve faces the nitrogen bottle, and is used to prevent gas loss in the nitrogen matrix in a closed state; A second pressure sensor is provided between the stop valve and the second gas-controlled one-way valve for real-time monitoring and feedback of the pressure state of the nitrogen cylinder.

6. The accumulator nitrogen charging and discharging system according to claim 1, characterized in that: A third gas-controlled one-way valve is arranged on the pipeline between the energy storage unit and the boosting unit, and an inlet side of the third gas-controlled one-way valve is connected to a nitrogen recovery system.

7. The accumulator nitrogen charging and discharging system according to any one of claims 1 to 6, characterized in that: A straight pipeline is also provided between the energy storage unit and the nitrogen matrix, the straight pipeline is connected in parallel with the booster unit, and a one-way valve with its outlet facing the nitrogen matrix is ​​provided on the straight pipeline; The boosting unit comprises a fourth gas-controlled one-way valve, the inlet side of the fourth gas-controlled one-way valve is connected to the inlet end of the boosting mechanism, and the outlet side of the fourth gas-controlled one-way valve faces the nitrogen matrix; The straight-through pipeline is provided with a fifth air-controlled one-way valve, and the outlet side of the fifth air-controlled one-way valve faces the energy storage unit.

8. The accumulator nitrogen charging and discharging system according to claim 7, characterized in that: The boosting unit comprises at least two groups of boosting mechanisms which operate alternately.

9. The accumulator nitrogen charging and discharging system according to claim 7, characterized in that: The boosting mechanism includes an oil pump, an electromagnetic reversing valve and a boosting cylinder; The oil pump is used to output hydraulic flow; The electromagnetic reversing valve is arranged between the oil pump and the boosting cylinder, and the electromagnetic reversing valve is respectively connected to the rod chamber and the rodless chamber of the boosting cylinder.

10. The accumulator nitrogen charging and discharging system according to claim 9, characterized in that: The boosting mechanism also includes: a safety valve, arranged downstream of the oil pump; And / or, a cooler is arranged on the oil return path of the supercharging mechanism.

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