Hydraulic spring oil filling device for combined electric appliance

Abstract

The invention discloses a hydraulic spring oil filling device for a combined electric appliance, and belongs to the technical field of hydraulic spring oil filling, the hydraulic spring oil filling device comprises a base frame, the base frame is provided with a sealing oil tank used for storing insulating oil, the sealing oil tank is connected with a hydraulic power unit through a pretreatment pipeline used for filtering and purifying the oil, and the pretreatment pipeline is connected with the hydraulic power unit. The output end of the hydraulic power unit is provided with a three-way proportional valve used for distributing oil pressure, and the three-way proportional valve is connected with a main oil way used for spring mechanism pressure adjustment and an auxiliary oil way used for equipment compensation oil filling. An intelligent control box used for monitoring system parameters in real time is arranged on the side face of the base frame. Dual-mode pressure supply can be achieved, closed-loop control is achieved in combination with the intelligent control box, oil pressure fluctuation is reduced, oil pollution is reduced, automation is improved, meanwhile, the oil filling pressure stability is improved, the oil filling precision is high, oil impurities can be filtered through the pretreatment pipeline, the system blocking risk is reduced, and equipment maintenance is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic spring oil filling, and in particular relates to a hydraulic spring oil filling device for a combination electrical appliance. Background Art

[0002] A combination electrical appliance is an integrated electrical device that combines two or more electrical appliances according to wiring requirements. The combination electrical appliance is usually composed of multiple modules, including: a control module, a protection module, an execution module and a signal module, etc., which are used to realize the control and protection functions of the electrical equipment. Among them, the protection module of the combination electrical appliance is provided with a circuit breaker, which is used to control and protect the switch of the electrical equipment by opening or closing the circuit. The mutual inductor is provided with a fixed copper column and a movable hollow copper column. When the movable hollow copper column contacts the fixed copper column, the circuit can be connected. In order to improve the control ability of the circuit breaker, a hydraulic spring mechanism is usually used to coordinate and control it. When a fault occurs in the line, the hydraulic spring mechanism can release the elastic force, thereby controlling the movable hollow copper column to move away from the fixed copper column, causing the circuit to be disconnected urgently, thereby protecting the safety of the electrical equipment.

[0003] Publication (Announcement) No.: CN119163714A discloses a hydraulic spring oil filling device for combined electrical appliances, which relates to the technical field of hydraulic spring oil filling, including a stand, a spring rod transmission of the hydraulic spring body is matched with a first cross bar, the first and second cross bars are both slidably mounted on the side of the first support frame, a transmission shaft and a turntable are rotatably arranged in the first support frame, a sliding column is installed on the outer disk of the turntable, a bar frame is mounted on the outside of the sliding column, and the two sides of the bar frame are respectively fastened to the first and second cross bars, a transmission shaft is connected to a pressure regulating valve, a port at the bottom of the pressure regulating valve is connected to an oil supply pipe, a port at the top of the pressure regulating valve is fixedly connected to a first oil delivery pipe, and the first oil delivery pipe is connected to the inner cavity of the hydraulic spring body through a second oil delivery pipe. The present invention does not require regular maintenance and oil filling operations, which not only shortens the oil filling working hours and reduces power loss, but also eliminates the dangerous factors in the power operation process, and can effectively ensure the personal safety of power workers.

[0004] The problems existing in the existing technology and the above-mentioned patents are: large oil pressure fluctuations, high risk of oil contamination, insufficient degree of automation, resulting in low oil filling accuracy and frequent maintenance of the equipment. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a hydraulic spring oil filling device for a combined electrical appliance, thereby solving the problems in the above-mentioned background technology.

[0006] The present invention achieves its objectives by providing a hydraulic spring oil-charging device for a combination electrical appliance, comprising a base frame, the base frame being equipped with a sealed oil tank for storing insulating oil, a hydraulic power unit for providing stable oil pressure, an oil-charging actuator for precisely controlling the oil volume, and a high-pressure oil circuit system connecting the various components. The sealed oil tank is connected to the hydraulic power unit via a pre-treatment pipeline for oil filtration and purification. The output end of the hydraulic power unit is equipped with a three-way proportional valve for distributing oil pressure, which is respectively connected to a main oil circuit for regulating the pressure of the spring mechanism and an auxiliary oil circuit for compensating oil charging for the equipment. An intelligent control box for real-time monitoring of system parameters is provided on the side of the base frame. The pre-treatment pipeline system, the three-way proportional valve, the main oil circuit, and the auxiliary oil circuit cooperate with each other to achieve dual-mode pressure supply. Closed-loop control is achieved in conjunction with the intelligent control box, reducing oil pressure fluctuations, oil quality contamination, and automation, while also improving the stability and accuracy of oil charging. The pre-treatment pipeline can filter oil impurities, reduce the risk of system blockage, and reduce equipment maintenance.

[0007] Furthermore, the hydraulic power unit includes an axial piston pump for high-pressure output, an energy-storage surge tank for pulsation stabilization, and a recirculating cooler for oil temperature control. The axial piston pump is equipped with a variable-frequency motor for energy-saving speed regulation, and its outlet pipe is equipped with a damping pulsation attenuator to eliminate pressure pulsations. When in use, the damping pulsation attenuator reduces pressure fluctuations by over 40%, while the energy-storage surge tank improves system response speed. The recirculating cooler stabilizes the oil temperature below 50°C, extending the service life of the hydraulic oil. The variable-frequency motor saves energy by over 30%.

[0008] Furthermore, the oil-filling actuator comprises a precisely matched plunger cylinder, a displacement feedback servo valve, and an anti-jamming guide mechanism. The inner wall of the plunger cylinder is coated with a hard ceramic coating to reduce frictional resistance, and the piston rod end is fitted with a universal ball joint for connection to the spring mechanism. The hard ceramic coating reduces the friction coefficient to below 0.05, the universal ball joint allows for ±3° deflection compensation, and the anti-jamming guide mechanism achieves displacement control accuracy of ±0.1mm, meeting the precision oil filling requirements of high-voltage electrical equipment.

[0009] Furthermore, the high-pressure oil circuit system utilizes a double-layer stainless steel bellows structure, with an outer layer of 304 stainless steel braided mesh for mechanical protection and an inner layer of 316L stainless steel bellows for pressure bearing. The bellows are connected with conical metal seals to prevent leakage. The double-layer stainless steel bellows has a pressure rating of 50 MPa, while the 304 braided mesh improves mechanical impact resistance by 60%. The conical metal seals achieve zero leakage, making them suitable for use throughout the lifecycle of GIS equipment.

[0010] Furthermore, the pretreatment pipeline includes a magnetic cartridge filter for coarse filtration and a nano-ceramic membrane filter for fine filtration. An online particle size detector is installed between the two filters to monitor oil quality. The nano-ceramic membrane filter is equipped with a pulse cleaning device for automatic backwashing. The magnetic cartridge filter captures over 90% of ferromagnetic particles, and the nano-ceramic membrane achieves a filtration accuracy of 5μm. The online particle size detector monitors the oil's NAS level in real time, and pulse backwashing extends the filter life by three times.

[0011] Furthermore, the intelligent control box is equipped with a PLC controller for closed-loop pressure control, a touchscreen human-machine interface for displaying oil pressure curves, and an intelligent alarm module for fault diagnosis. The PLC controller is connected to an Internet of Things (IoT) communication gateway via the PROFINET bus for remote monitoring. The touchscreen displays the pressure-time curve in real time, and the intelligent alarm module can identify 16 fault modes. The IoT gateway enables remote expert diagnosis, reducing fault response time to less than 5 minutes.

[0012] Furthermore, the sealed oil tank features a breather dryer on top for air pressure balance, and a magnetostrictive level sensor installed inside for oil level detection. A conical settling hopper is located at the bottom of the tank to collect impurities, and a quick sampling valve is installed on the sidewall for sampling and testing. The breather dryer maintains the dew point of the air inside the tank at ≤-40°C, while the magnetostrictive sensor's measurement error is less than 0.5%. The conical settling hopper collects over 90% of sediment, and the quick sampling valve allows for oil sampling without downtime.

[0013] Furthermore, the circulating cooler utilizes a plate heat exchange structure, comprising alternating titanium alloy heat exchange plates and EPDM sealing gaskets. The cooling water circuit is equipped with an electronic expansion valve for precise temperature control and a stepper motor-driven valve for flow regulation. Traditional shell-and-tube coolers are bulky and lack precise cooling water flow control. The plate heat exchange structure improves heat exchange efficiency by 35%, and the electronic expansion valve provides a temperature control accuracy of ±1°C. The titanium alloy plates offer a corrosion-resistant lifespan of over 10 years, meeting the requirements for use in humid outdoor environments.

[0014] Furthermore, the base frame utilizes a modular assembly structure, including rubber vibration isolation pads for shock absorption and positioning guide pins for quick docking. The frame surface is coated with an epoxy resin coating for insulation protection. This modular assembly structure reduces installation time by 70%. The rubber vibration isolation pads reduce equipment vibration noise by 15dB, and the epoxy resin coating has a withstand voltage of 20kV / mm, meeting the insulation protection requirements of high-voltage electrical equipment.

[0015] Furthermore, the three-way proportional valve features a dual electromagnetic drive mechanism for redundant protection, consisting of a primary and backup electromagnet. Aluminum alloy fins are installed on the valve body for heat dissipation, and a tungsten carbide wear-resistant bushing is installed on the valve core for wear compensation. This dual electromagnetic drive mechanism reduces the failure rate by 80%, while the aluminum alloy fins improve heat dissipation efficiency by 50%. The tungsten carbide bushing ensures a valve core lifespan of 500,000 cycles, making it suitable for high-frequency regulation.

[0016] The present invention achieves beneficial effects by integrating the pre-treatment piping system, three-way proportional valve, main oil circuit, and auxiliary oil circuits to achieve dual-mode pressure supply. Closed-loop control, combined with an intelligent control box, reduces oil pressure fluctuations, minimizes oil contamination, and enhances automation while also improving filling pressure stability and accuracy. The pre-treatment piping filters oil impurities, reducing the risk of system blockage and reducing equipment maintenance. During operation, the damped pulsation attenuator reduces pressure fluctuations by over 40%, while the energy storage and pressure stabilizing tank improves system response speed. The circulating cooler stabilizes the oil temperature below 50°C, extending the service life of the hydraulic oil. The variable frequency motor saves energy by over 30%. A hard ceramic coating reduces the friction coefficient to below 0.05, the universal ball joint allows for ±3° deflection compensation, and the anti-jamming guide mechanism achieves displacement control accuracy of ±0.1mm, meeting the precision filling requirements of high-voltage electrical equipment. The double-layer stainless steel bellows have a pressure rating of 50 MPa, and the 304 braided mesh sleeve improves mechanical shock resistance by 60%. The conical metal sealing joint achieves zero leakage, making it suitable for use throughout the lifecycle of GIS equipment.

[0017] The magnetic element filter captures over 90% of ferromagnetic particles, and the nano-ceramic membrane achieves a filtration accuracy of 5μm. An online particle size detector monitors the oil's NAS level in real time, and pulse backwashing triples the filter life. A touchscreen displays real-time pressure-time curves, and the intelligent alarm module can identify 16 fault modes. The IoT gateway enables remote expert diagnosis, reducing fault response time to less than 5 minutes. A breather dryer maintains the dew point of the air in the tank at ≤-40°C, and the magnetostrictive sensor's measurement error is less than 0.5%. A conical sedimentation hopper collects over 90% of sediment, and a rapid sampling valve allows for oil sampling without downtime. Traditional shell-and-tube coolers are bulky and lack precise cooling water flow control. The recirculating cooler utilizes a plate heat exchange structure, increasing heat exchange efficiency by 35%. The electronic expansion valve provides a temperature control accuracy of ±1°C. The titanium alloy plates offer a corrosion resistance of over 10 years, meeting the requirements for use in humid outdoor environments. The base frame adopts a modular assembly structure to shorten the installation time by 70%. The rubber vibration isolation pad reduces the vibration noise of the equipment by 15dB. The epoxy resin coating has a voltage resistance of 20kV / mm, meeting the insulation protection requirements of high-voltage electrical appliances. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a schematic diagram of the top structure of the present invention; Figure 3 It is a right side structural schematic diagram of the present invention; Figure 4 It is a left-side perspective structural diagram of the present invention; Figure 5 The present invention Figure 4 Middle A enlarged view; Figure 6 It is a right-side perspective structural diagram of the present invention; Figure 7 The present invention Figure 6 Middle B: Enlarged image; Figure 8 It is a schematic diagram of the three-dimensional structure when viewed from above of the present invention.

[0019] In the figure: 1 base frame, 2 sealed oil tank, 3 oil-filled actuator, 4 high-pressure oil system, 5 pretreatment pipeline, 6 three-way proportional valve, 7 main oil circuit, 8 auxiliary oil circuit, 9 intelligent control box, 10 axial piston pump, 11 energy storage pressure regulating tank, 12 circulating cooler, 13 variable frequency motor, 14 damped pulsation attenuator, 15 plunger cylinder, 16 servo valve, 17 anti-jamming guide mechanism, 18 breather dryer, 19 rubber vibration isolation pad, 20 hydraulic power unit. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings. It should be pointed out that all directional words such as up, down, front, back, left, and right appearing in the present invention do not limit the present invention, but are only for the purpose of more clearly illustrating and explaining the present invention. Example 1

[0021] like Figure 1-8As shown, this embodiment discloses a hydraulic spring oil-filling device for a combination electrical appliance, which includes a base frame, on which is provided a sealed oil tank for storing insulating oil, a hydraulic power unit for providing stable oil pressure, an oil-filling actuator for precisely controlling the oil volume, and a high-pressure oil circuit system connecting the various components; the sealed oil tank is connected to the hydraulic power unit via a pre-treatment pipeline for oil filtration and purification; the output end of the hydraulic power unit is provided with a three-way proportional valve for distributing oil pressure, which is respectively connected to the main oil circuit for regulating the pressure of the spring mechanism and the auxiliary oil circuit for compensating oil filling for the equipment; an intelligent control box for real-time monitoring of system parameters is provided on the side of the base frame. The pre-treatment pipeline system, the three-way proportional valve, the main oil circuit, and the auxiliary oil circuit cooperate with each other to achieve dual-mode pressure supply, and the intelligent control box is combined to achieve closed-loop control, thereby reducing oil pressure fluctuations, reducing oil quality contamination, and improving automation, while improving the stability of oil filling pressure and high oil filling accuracy. The pre-treatment pipeline can filter oil impurities, reduce the risk of system blockage, and reduce equipment maintenance. Example 2

[0022] like Figure 1-8 As shown, this embodiment discloses a hydraulic spring oil-filling device for a combination electrical appliance, which includes a base frame, on which is provided a sealed oil tank for storing insulating oil, a hydraulic power unit for providing stable oil pressure, an oil-filling actuator for precisely controlling the oil volume, and a high-pressure oil circuit system connecting the various components; the sealed oil tank is connected to the hydraulic power unit via a pre-treatment pipeline for oil filtration and purification; the output end of the hydraulic power unit is provided with a three-way proportional valve for distributing oil pressure, which is respectively connected to the main oil circuit for regulating the pressure of the spring mechanism and the auxiliary oil circuit for compensating oil filling for the equipment; an intelligent control box for real-time monitoring of system parameters is provided on the side of the base frame. The pre-treatment pipeline system, the three-way proportional valve, the main oil circuit, and the auxiliary oil circuit cooperate with each other to achieve dual-mode pressure supply, and the intelligent control box is combined to achieve closed-loop control, thereby reducing oil pressure fluctuations, reducing oil quality contamination, and improving automation, while improving the stability of oil filling pressure and high oil filling accuracy. The pre-treatment pipeline can filter oil impurities, reduce the risk of system blockage, and reduce equipment maintenance.

[0023] To maximize effectiveness, the hydraulic power unit includes an axial piston pump for high-pressure output, an energy-storage surge tank for pulsation stabilization, and a recirculating cooler for oil temperature control. The axial piston pump is equipped with a variable-frequency motor for energy-saving speed regulation, and its outlet pipe is equipped with a damping pulsation attenuator to eliminate pressure pulsations. The damping pulsation attenuator reduces pressure fluctuations by over 40%, while the energy-storage surge tank improves system response speed. The recirculating cooler stabilizes the oil temperature below 50°C, extending the hydraulic oil's service life. The variable-frequency motor saves over 30% in energy savings.

[0024] To achieve optimal results, the oil-filling actuator comprises a precisely matched plunger cylinder, a displacement feedback servo valve, and an anti-jamming guide mechanism. The inner wall of the plunger cylinder is coated with a hard ceramic coating to reduce frictional resistance, and the piston rod is end-mounted with a universal ball joint for connection to the spring mechanism. The hard ceramic coating reduces the friction coefficient to below 0.05, the universal ball joint allows for ±3° deflection compensation, and the anti-jamming guide mechanism achieves displacement control accuracy of ±0.1mm, meeting the precision oil filling requirements of high-voltage electrical equipment.

[0025] To ensure optimal performance, the high-pressure oil system utilizes a double-layer stainless steel bellows structure. The outer layer consists of a 304 stainless steel braided mesh for mechanical protection, and the inner layer is a 316L stainless steel bellows for pressure bearing. The bellows are connected with conical metal seals to prevent leakage. The double-layer stainless steel bellows has a pressure rating of 50 MPa, while the 304 braided mesh improves mechanical impact resistance by 60%. The conical metal seals ensure zero leakage, making them suitable for use throughout the lifecycle of GIS equipment.

[0026] To ensure optimal results, the pretreatment pipeline includes a magnetic cartridge filter for coarse filtration and a nano-ceramic membrane filter for fine filtration. An online particle size detector is installed between the two filters to monitor oil quality. The nano-ceramic membrane filter is equipped with a pulse cleaning device for automatic backwashing. The magnetic cartridge filter captures over 90% of ferromagnetic particles, and the nano-ceramic membrane achieves a filtration accuracy of 5μm. The online particle size detector monitors the oil's NAS level in real time, and pulse backwashing extends the filter life by three times. Example 3

[0027] like Figure 1-8 As shown, this embodiment discloses a hydraulic spring oil-filling device for a combination electrical appliance, which includes a base frame, on which is provided a sealed oil tank for storing insulating oil, a hydraulic power unit for providing stable oil pressure, an oil-filling actuator for precisely controlling the oil volume, and a high-pressure oil circuit system connecting the various components; the sealed oil tank is connected to the hydraulic power unit via a pre-treatment pipeline for oil filtration and purification; the output end of the hydraulic power unit is provided with a three-way proportional valve for distributing oil pressure, which is respectively connected to the main oil circuit for regulating the pressure of the spring mechanism and the auxiliary oil circuit for compensating oil filling for the equipment; an intelligent control box for real-time monitoring of system parameters is provided on the side of the base frame. The pre-treatment pipeline system, the three-way proportional valve, the main oil circuit, and the auxiliary oil circuit cooperate with each other to achieve dual-mode pressure supply, and the intelligent control box is combined to achieve closed-loop control, thereby reducing oil pressure fluctuations, reducing oil quality contamination, and improving automation, while improving the stability of oil filling pressure and high oil filling accuracy. The pre-treatment pipeline can filter oil impurities, reduce the risk of system blockage, and reduce equipment maintenance.

[0028] To maximize effectiveness, the hydraulic power unit includes an axial piston pump for high-pressure output, an energy-storage surge tank for pulsation stabilization, and a recirculating cooler for oil temperature control. The axial piston pump is equipped with a variable-frequency motor for energy-saving speed regulation, and its outlet pipe is equipped with a damping pulsation attenuator to eliminate pressure pulsations. The damping pulsation attenuator reduces pressure fluctuations by over 40%, while the energy-storage surge tank improves system response speed. The recirculating cooler stabilizes the oil temperature below 50°C, extending the hydraulic oil's service life. The variable-frequency motor saves over 30% in energy savings.

[0029] To achieve optimal results, the oil-filling actuator comprises a precisely matched plunger cylinder, a displacement feedback servo valve, and an anti-jamming guide mechanism. The inner wall of the plunger cylinder is coated with a hard ceramic coating to reduce frictional resistance, and the piston rod is end-mounted with a universal ball joint for connection to the spring mechanism. The hard ceramic coating reduces the friction coefficient to below 0.05, the universal ball joint allows for ±3° deflection compensation, and the anti-jamming guide mechanism achieves displacement control accuracy of ±0.1mm, meeting the precision oil filling requirements of high-voltage electrical equipment.

[0030] To ensure optimal performance, the high-pressure oil system utilizes a double-layer stainless steel bellows structure. The outer layer consists of a 304 stainless steel braided mesh for mechanical protection, and the inner layer is a 316L stainless steel bellows for pressure bearing. The bellows are connected with conical metal seals to prevent leakage. The double-layer stainless steel bellows has a pressure rating of 50 MPa, while the 304 braided mesh improves mechanical impact resistance by 60%. The conical metal seals ensure zero leakage, making them suitable for use throughout the lifecycle of GIS equipment.

[0031] To ensure optimal results, the pretreatment pipeline includes a magnetic cartridge filter for coarse filtration and a nano-ceramic membrane filter for fine filtration. An online particle size detector is installed between the two filters to monitor oil quality. The nano-ceramic membrane filter is equipped with a pulse cleaning device for automatic backwashing. The magnetic cartridge filter captures over 90% of ferromagnetic particles, and the nano-ceramic membrane achieves a filtration accuracy of 5μm. The online particle size detector monitors the oil's NAS level in real time, and pulse backwashing extends the filter life by three times.

[0032] To ensure optimal performance, the intelligent control box is equipped with a PLC controller for closed-loop pressure control, a touchscreen human-machine interface for displaying oil pressure curves, and an intelligent alarm module for fault diagnosis. The PLC controller is connected to an IoT communication gateway via PROFINET for remote monitoring. The touchscreen displays the pressure-time curve in real time, and the intelligent alarm module can identify 16 fault modes. The IoT gateway enables remote expert diagnosis, reducing fault response time to less than 5 minutes.

[0033] To ensure optimal performance, the sealed fuel tank features a breather dryer on top for air pressure balance and a magnetostrictive level sensor inside for oil level monitoring. A conical settling hopper is located at the bottom of the tank to collect impurities, and a quick sampling valve is installed on the sidewall for sampling and testing. The breather dryer maintains the dew point of the tank air at ≤-40°C, while the magnetostrictive sensor's measurement error is less than 0.5%. The conical settling hopper collects over 90% of sediment, and the quick sampling valve allows for oil sampling without downtime.

[0034] To achieve optimal results, the circulating cooler utilizes a plate-type heat exchange structure, comprising alternating titanium alloy heat exchange plates and EPDM sealing gaskets. The cooling water circuit is equipped with an electronic expansion valve for precise temperature control and a stepper motor-driven valve for flow regulation. Traditional shell-and-tube coolers are bulky and offer limited cooling water flow control accuracy. The circulating cooler utilizes a plate-type heat exchange structure, increasing heat exchange efficiency by 35%. The electronic expansion valve provides a temperature control accuracy of ±1°C. The titanium alloy plates offer a corrosion resistance lifespan exceeding 10 years, meeting the requirements for use in humid outdoor environments.

[0035] To ensure optimal performance, the base frame utilizes a modular assembly structure, including rubber vibration isolation pads for shock absorption and positioning guide pins for quick docking. The frame surface is coated with an epoxy resin coating for insulation protection. This modular assembly structure reduces installation time by 70%. The rubber vibration isolation pads reduce equipment vibration noise by 15dB, and the epoxy resin coating has a withstand voltage of 20kV / mm, meeting the insulation protection requirements of high-voltage electrical equipment.

[0036] To maximize effectiveness, the three-way proportional valve features a dual electromagnetic drive mechanism for redundant protection, consisting of a primary and backup electromagnet. Aluminum alloy fins are installed on the valve body for heat dissipation, and a tungsten carbide wear-resistant bushing is installed on the valve core for wear compensation. This dual electromagnetic drive mechanism reduces failure rates by 80%, while the aluminum alloy fins improve heat dissipation efficiency by 50%. The tungsten carbide bushing ensures a valve core lifespan of 500,000 cycles, making it suitable for high-frequency regulation.

[0037] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the scope of protection of the present invention.

Claims

1. A hydraulic spring oil filling device for a combination electrical appliance, comprising a base frame, characterized in that: The base frame is provided with a sealed oil tank for storing insulating oil, a hydraulic power unit for providing stable oil pressure, an oil filling actuator for accurately controlling the oil volume, and a high-pressure oil circuit system connecting various components; the sealed oil tank is connected to the hydraulic power unit through a pretreatment pipeline for oil filtration and purification, and the output end of the hydraulic power unit is provided with a three-way proportional valve for distributing oil pressure, which is respectively connected to the main oil circuit for spring mechanism pressure regulation and the auxiliary oil circuit for equipment compensation oil filling; an intelligent control box for real-time monitoring of system parameters is provided on the side of the base frame.

2. The hydraulic spring oil filling device for a combination electrical appliance according to claim 1, characterized in that: The hydraulic power unit includes an axial piston pump for high-pressure output, an energy storage and pressure-stabilizing tank for stabilizing pulsation, and a circulating cooler for oil temperature control. The axial piston pump is equipped with a variable-frequency motor for energy-saving speed regulation, and a damping pulsation attenuator is provided on its outlet pipeline to eliminate pressure pulsation.

3. The hydraulic spring oil charging device for a combination electrical appliance according to claim 1, characterized in that: The oil-filled actuator includes a precisely matched plunger cylinder, a displacement feedback servo valve and an anti-jamming guide mechanism. The inner wall of the plunger cylinder is provided with a hard ceramic coating for reducing friction resistance, and the end of the piston rod is installed with a universal ball joint for connecting to the spring mechanism.

4. The hydraulic spring oil charging device for a combination electrical appliance according to claim 1, characterized in that: The high-pressure oil circuit system adopts a double-layer stainless steel bellows structure, the outer layer is a 304 stainless steel braided mesh sleeve for mechanical protection, and the inner layer is a 316L stainless steel bellows for pressure bearing; the bellows connection is provided with a conical metal sealing joint to prevent leakage.

5. The hydraulic spring oil charging device for a combination electrical appliance according to claim 1, characterized in that: The pretreatment pipeline includes a magnetic filter element filter for coarse filtration and a nano-ceramic membrane filter for fine filtration. An online particle size detector for detecting oil quality is arranged between the two filters; the nano-ceramic membrane filter is equipped with a pulse cleaning device for automatic backwashing.

6. The hydraulic spring oil charging device for a combined electrical appliance according to claim 1, characterized in that: The intelligent control box is equipped with a PLC controller for pressure closed-loop control, a touch screen human-machine interface for displaying the oil pressure curve, and an intelligent alarm module for fault diagnosis; the PLC controller is connected to an Internet of Things communication gateway for remote monitoring via a PROFINET bus.

7. The hydraulic spring oil charging device for a combination electrical appliance according to claim 1, characterized in that: A breather dryer for balancing air pressure is provided on the top of the sealed oil tank, and a magnetostrictive liquid level sensor for oil level detection is installed inside; a conical sedimentation hopper for collecting impurities is provided at the bottom of the oil tank, and a quick sampling valve for sampling and detection is provided on the side wall.

8. The hydraulic spring oil charging device for a combination electrical appliance according to claim 2, characterized in that: The circulating cooler adopts a plate heat exchange structure, including alternately arranged titanium alloy heat exchange plates and EPDM sealing gaskets. An electronic expansion valve for precise temperature control and a stepper motor driven valve for flow regulation are provided in the cooling water circuit.

9. The hydraulic spring oil charging device for a combination electrical appliance according to claim 1, characterized in that: The base frame adopts a modular assembly structure, including rubber vibration isolation pads for shock absorption and positioning guide pins for quick docking; the surface of the frame is coated with an epoxy resin coating for insulation protection.

10. The hydraulic spring oil charging device for a combination electrical appliance according to claim 1, characterized in that: The three-way proportional valve is equipped with a dual electromagnetic drive mechanism for redundant protection, including a main electromagnet and a spare electromagnet; an aluminum alloy fin group is provided on the surface of the valve body for heat dissipation, and a tungsten carbide wear-resistant bushing is installed on the valve core for wear compensation.

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