An oil changing device for replacing insulating oil in heavily overloaded old transformers

Abstract

The present invention relates to an oil changing device for replacing insulating oil in a heavily overloaded old transformer. The oil changing device comprises a frame, an oil draining mechanism, an oil feeding mechanism and a transformer casing. Moving wheels are provided on the left and right sides of the frame, a storage box is provided on the left side below the frame, an oil draining mechanism and an oil feeding mechanism are provided on the left and right sides above the frame respectively, an oil purifying mechanism and an oil filtering mechanism are provided on the inner sides of the oil draining mechanism and the oil feeding mechanism respectively, a hydraulic lifting mechanism is provided below the oil draining mechanism and the oil feeding mechanism, an oil pump is provided above the hydraulic lifting mechanism, a second oil pipe is provided on the right side of the oil pump, a support is provided below the second oil pipe, a supporting roller is provided above the support, a double-tube adjusting mechanism is provided on the outside of the oil pump, a first bracket is provided in front of the double-tube adjusting mechanism, and a first oil pipe is provided above the double-tube adjusting mechanism. The oil changing device has the advantages of reasonable structure, convenient use, good oil changing effect, high oil changing efficiency and no influence on oil quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil-immersed transformer application equipment, and in particular relates to an oil changing device for replacing insulating oil in a heavily overloaded old transformer. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are the primary coil, the secondary coil, and the iron core (magnetic core). In electrical equipment and wireless circuits, it is often used to increase or decrease voltage, match impedance, and provide safety isolation. It is the basic equipment for power transmission and distribution and is widely used in industry, agriculture, transportation, urban communities, and other fields. Insulating oil is widely used in power transmission and transformation equipment such as transformers, oil circuit breakers, oil-filled cables, power capacitors, and bushings. It plays the role of insulation, cooling, and arc extinguishing, and can effectively maintain the normal operation of electrical equipment. After long-term operation, especially overload operation, the insulating oil of the transformer will inevitably deteriorate, the moisture content of the transformer oil will increase, the acid value will increase, the dielectric loss will increase, and the insulation capacity will decrease. Heavy overload old transformers need to be treated. The insulating oil of the old transformer is changed to ensure the transformer continues to operate safely. The current oil changing equipment uses an oil pump to fill the oil and a shared pipeline. There is no forced oil discharge, and the waste oil cannot be treated in time. Direct discharge will pollute the environment. It is also impossible to perform preliminary water removal on the newly replaced insulating oil, resulting in poor oil change effect, excessive water content in the oil, and other problems, affecting the performance of the insulating oil. In addition, the oil changing equipment cannot be adjusted according to the height of transformers of different heights, and a longer pipeline is required, which reduces the oil change efficiency, resulting in a longer oil change time and inconvenience in use. Therefore, it is very necessary to provide an oil changing device for replacing the insulating oil of heavily overloaded old transformers, which has a reasonable structure, is easy to use, has a good oil change effect, high oil change efficiency, and has no effect on oil quality. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide an oil changing device for replacing the insulating oil of a heavily overloaded old transformer with a reasonable structure, easy use, good oil changing effect, high oil changing efficiency and no effect on oil quality.

[0004] The object of the present invention is achieved in this way: an oil changing device for replacing insulating oil in a heavily overloaded old transformer comprises a frame, an oil draining mechanism, an oil feeding mechanism and a transformer box shell, movable wheels are provided on the left and right sides of the frame, a storage box is provided on the left side below the frame, an oil level gauge is provided inside the storage box, an oil draining mechanism and an oil feeding mechanism are respectively provided on the left and right sides above the frame, an oil purifying mechanism and an oil filtering mechanism are respectively provided on the inside of the oil draining mechanism and the oil feeding mechanism, a hydraulic lifting mechanism is provided below the oil draining mechanism and the oil feeding mechanism, an oil pump is provided above the hydraulic lifting mechanism, a second oil pipe is provided on the right side of the oil pump, a support is provided below the second oil pipe, a supporting roller is provided above the support, a double-tube adjusting mechanism is provided on the outside of the oil pump, the double-tube adjusting mechanism is connected to the oil pump through a first connecting pipe, a first bracket is provided in front of the double-tube adjusting mechanism, and a first oil pipe is provided above the double-tube adjusting mechanism.

[0005] The oil purification mechanism and the oil filtering mechanism are respectively connected to the oil discharge mechanism and the oil delivery mechanism through a second oil pipe. A fine filter is provided below the oil purification mechanism, a second bracket is provided above the fine filter, a heating and settling device is provided on the inner side of the second bracket, a coarse filter plate is provided inside the heating and settling device, temperature control devices are provided on the left and right sides below the heating and settling device, heating plates are provided at the contact points between the temperature control device and the heating and settling device, and the heating and settling device is connected to the fine filter through a second connecting pipe; the oil filtering mechanism includes a vacuum dehydration oil filter, and an active oil pipe is provided in front of the vacuum dehydration oil filter.

[0006] The fine filter adopts HN type fine filter, the coarse filter plate is of obtuse inverted "V" structure, the heating plate is of arc structure, and the vacuum dehydration oil filter adopts zjd-f type oil filter.

[0007] The hydraulic lifting mechanism includes a base and a workbench, a platform is provided on the workbench, an articulated lifting arm is provided between the base and the workbench, the parallel articulated lifting arms above the base are connected by parallel connecting rods, a mounting seat is provided above the base, a hydraulic rod is provided on the right side of the mounting seat, a cross bar is provided on the inner side of the hinge at both ends of the articulated lifting arm, a drive rod is provided on the inner side of the cross bar, and the drive rod is connected to the hydraulic rod through a connecting flange.

[0008] The dual-tube adjustment mechanism includes an inlet connected to the first oil pipe, a flow meter is provided below the inlet, branch pipes are provided on the left and right sides of the flow meter, oil tanks are provided below the branch pipes, valves are provided below the oil tanks, outlets connected to the first connecting pipe are provided below the valves, a controller is provided in front of the oil tank, and the controllers are connected to the valves through control lines.

[0009] A mounting flange is provided below the oil level gauge, three viewing windows are provided above the oil level gauge, a pressure relief valve is provided at the upper end of the oil level gauge, a locking frame is provided outside the pressure relief valve, the pressure relief valve is connected to the oil level gauge via the locking frame, and the locking frame is connected to the pressure relief valve via a locking screw.

[0010] Several detachable radiators are evenly arranged inside the transformer box from left to right, an oil drain valve is provided at the lower left side of the transformer box, an oil purifier is provided on the right side of the transformer box, a box cover is provided above the transformer box, several high and low voltage outlet insulating bushings are provided above the box cover, an oil conservator is provided on the right side of the box cover, an arc-shaped safety airway is provided above the oil conservator, and a desiccant is provided below the oil conservator.

[0011] The oil drain valve is connected to the oil drain mechanism through a corresponding first oil pipe, the oil purifier is connected to the oil delivery mechanism through a corresponding first oil pipe, and the oil level gauge is connected to the oil storage cabinet through a mounting flange.

[0012] Beneficial effects of the present invention: The present invention is an oil changing device for replacing insulating oil in heavily overloaded old transformers. During use, the oil drain mechanism is first connected to the oil drain valve through the first oil pipe, the oil drain valve is opened, and the old mineral oil in the transformer is accelerated and effectively extracted through the oil pump and the double-tube regulating mechanism, ensuring the oil drain flow rate and efficiency, and the extracted waste oil is sent to the temperature rising and settling device, and the large particle impurities in the waste oil are filtered through the coarse filter plate, and then the waste oil is left to stand by sedimentation to allow the impurities to fall and separate, and the waste oil is quickly settled by the temperature control device and the heating plate, which greatly shortens the sedimentation time. The higher the oil temperature, the smaller the viscosity, the easier it is for the impurities to fall, and the shorter the sedimentation time. The settled waste oil is treated by the fine filter The oil is then drained and the oil is re-used, which is environmentally friendly. When the oil is drained, the oil drain valve is closed, the oil level gauge is connected to the oil storage cabinet, the oil delivery mechanism is connected to the oil purifier through the first oil pipe, and new oil is injected into the vacuum dehydration oil filter through the source oil pipe. The oil pump and the double-tube regulating mechanism are used to deliver the new oil into the transformer through the oil purifier, thereby ensuring the oil delivery flow and efficiency. The new oil is subjected to multi-stage treatment by the vacuum dehydration oil filter and the oil purifier, thereby solving the problem of excessive water content in the oil, filtering and removing trace particulate impurities in the insulating oil, avoiding affecting the oil quality, and improving the oil changing effect. The present invention has the advantages of reasonable structure, convenient use, good oil changing effect, high oil changing efficiency, and no affecting the oil quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a front view of an oil changing device for replacing insulating oil in a heavily overloaded old transformer according to the present invention.

[0014] Figure 2 The figure is a schematic diagram of the internal structure of an oil changing device for replacing insulating oil in a heavily overloaded old transformer according to the present invention.

[0015] Figure 3 For the present invention Figure 2 Schematic diagram of part of the structure Figure 1 .

[0016] Figure 4 For the present invention Figure 2 Schematic diagram of part of the structure Figure 2 .

[0017] Figure 5 The present invention is a structural schematic diagram of a hydraulic lifting mechanism of an oil changing device for replacing insulating oil in a heavily overloaded old transformer.

[0018] Figure 6 For the present invention Figure 5 Stereoscopic image.

[0019] Figure 7 For the present invention Figure 6 Top view of .

[0020] Figure 8This is a structural schematic diagram of a double-tube regulating mechanism of an oil changing device for replacing insulating oil in a heavily overloaded old transformer according to the present invention.

[0021] Figure 9 The present invention is a structural schematic diagram of an oil level gauge of an oil changing device for replacing insulating oil in a heavily overloaded old transformer.

[0022] Figure 10 The present invention is a schematic diagram of the use status of an oil changing device for replacing insulating oil in a heavily overloaded old transformer.

[0023] In the figure: 1, frame 2, moving wheel 3, storage box 4, oil discharge mechanism 5, oil delivery mechanism 6, oil purification mechanism 7, oil filter mechanism 8, hydraulic lifting mechanism 81, base 82, workbench 821, platform 83, articulated lifting arm 84, connecting rod 85, mounting base 86, hydraulic rod 87, cross bar 88, driving rod 89, connecting flange 9, oil pump 10, double-tube adjustment mechanism 101, pipe inlet 102, flow meter 103, branch pipe 104, oil tank 105, controller 106, valve 107, pipe outlet 108, control line 11, first connecting pipe 12, first bracket 13, first oil Pipe 14, second oil pipe 15, support 16, support roller 17, oil level gauge 171, mounting flange 172, three-sided windows 173, pressure relief valve 174, lock frame 175, locking screw 18, fine filter 19, second bracket 20, heating and settling device 21, coarse filter plate 22, temperature control device 23, heating plate 24, second connecting pipe 25, vacuum dehydration oil filter 26, source oil pipe 27, transformer casing 28, detachable radiator 29, oil drain valve 30, oil purifier 31, box cover 32, high and low voltage outlet insulating sleeves 33, oil conservator 34, safety air duct 35, desiccant. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figure 1-10As shown, an oil changing device for replacing insulating oil in a heavily overloaded old transformer comprises a frame 1, an oil draining mechanism 4, an oil feeding mechanism 5 and a transformer casing 27. Moving wheels 2 are provided on both sides of the frame 1, a storage box 3 is provided on the left side below the frame 1, an oil level gauge 17 is provided inside the storage box 3, an oil draining mechanism 4 and an oil feeding mechanism 5 are provided on the left and right sides above the frame 1, an oil purifying mechanism 6 and an oil filtering mechanism 7 are provided inside the oil draining mechanism 4 and the oil feeding mechanism 5, and an oil level gauge 17 is provided below the oil draining mechanism 4 and the oil feeding mechanism 5. They are all provided with a hydraulic lifting mechanism 8, an oil pump 9 is provided above the hydraulic lifting mechanism 8, a second oil pipe 14 is provided on the right side of the oil pump 9, a support 15 is provided below the second oil pipe 14, and a support roller 16 is provided above the support 15. A double-tube adjustment mechanism 10 is provided on the outside of the oil pump 9, and the double-tube adjustment mechanism 10 is connected to the oil pump 9 through a first connecting pipe 11. A first bracket 12 is provided in front of the double-tube adjustment mechanism 10, and a first oil pipe 13 is provided above the double-tube adjustment mechanism 10.

[0027] The oil purification mechanism 6 and the oil filtering mechanism 7 are respectively connected to the oil discharge mechanism 4 and the oil delivery mechanism 5 through the second oil pipe 14. A fine filter 18 is provided below the oil purification mechanism 6, and a second bracket 19 is provided above the fine filter 18. A heating and settling device 20 is provided on the inner side of the second bracket 19. A coarse filter plate 21 is provided inside the heating and settling device 20. Temperature control devices 22 are provided on the left and right sides below the heating and settling device 20. A heating plate 23 is provided at the contact point between the temperature control device 22 and the heating and settling device 20. The heating and settling device 20 is connected to the fine filter 18 through a second connecting pipe 24; the oil filtering mechanism 7 includes a vacuum dehydration oil filter 25, and an active oil pipe 26 is provided in front of the vacuum dehydration oil filter 25.

[0028] For better effect, the fine filter 18 adopts HN type fine filter, the coarse filter plate 21 is an obtuse inverted "V" structure, the heating plate 23 is an arc structure, and the vacuum dehydration oil filter 25 adopts zjd-f type oil filter.

[0029] The present invention is an oil changing device for replacing insulating oil in heavily overloaded old transformers. During use, the oil drain mechanism is first connected to the oil drain valve 29 through the first oil pipe 13, and the oil drain valve 29 is opened. The old mineral oil in the transformer is accelerated and effectively extracted through the oil pump 9 and the double-tube regulating mechanism 10 to ensure the oil drain flow rate and efficiency. The extracted waste oil is then sent to the heating and settling device 20, and large particles of impurities in the waste oil are filtered through the coarse filter plate 21. The waste oil 20 is then allowed to stand by settling to allow the impurities to fall and separate. The temperature control device 22 and the heating plate 23 are used to achieve rapid settling of the waste oil, greatly shortening the settling time. The higher the oil temperature, the lower the viscosity, the easier it is for the impurities to fall, and the shorter the settling time. The settled waste oil is processed through the fine filter 18. The waste oil is reused, which is environmentally friendly. After the oil is drained, the oil drain valve 29 is closed, the oil level gauge 17 is installed and connected to the oil storage cabinet 33, the oil delivery mechanism is connected to the oil purifier 30 through the first oil pipe 13, and then new oil is injected into the vacuum dehydration oil filter 25 through the source oil pipe 26. The oil pump 9 and the double-tube regulating mechanism 10 are used to deliver the new oil into the transformer to ensure the oil delivery flow and efficiency. The new oil is subjected to multi-stage treatment by the vacuum dehydration oil filter 25 and the oil purifier 30 to solve the problem of excessive water content in the oil, filter and remove trace particulate impurities in the insulating oil, avoid affecting the oil quality, and improve the oil change effect. The present invention has the advantages of reasonable structure, easy use, good oil change effect, high oil change efficiency, and no impact on the oil quality.

[0030] Example 2

[0031] like Figure 1-10 As shown, an oil changing device for replacing insulating oil in a heavily overloaded old transformer comprises a frame 1, an oil draining mechanism 4, an oil feeding mechanism 5 and a transformer casing 27. Moving wheels 2 are provided on both sides of the frame 1, a storage box 3 is provided on the left side below the frame 1, an oil level gauge 17 is provided inside the storage box 3, an oil draining mechanism 4 and an oil feeding mechanism 5 are provided on the left and right sides above the frame 1, an oil purifying mechanism 6 and an oil filtering mechanism 7 are provided inside the oil draining mechanism 4 and the oil feeding mechanism 5, and an oil level gauge 17 is provided below the oil draining mechanism 4 and the oil feeding mechanism 5. They are all provided with a hydraulic lifting mechanism 8, an oil pump 9 is provided above the hydraulic lifting mechanism 8, a second oil pipe 14 is provided on the right side of the oil pump 9, a support 15 is provided below the second oil pipe 14, and a support roller 16 is provided above the support 15. A double-tube adjustment mechanism 10 is provided on the outside of the oil pump 9, and the double-tube adjustment mechanism 10 is connected to the oil pump 9 through a first connecting pipe 11. A first bracket 12 is provided in front of the double-tube adjustment mechanism 10, and a first oil pipe 13 is provided above the double-tube adjustment mechanism 10.

[0032] The oil purification mechanism 6 and the oil filtering mechanism 7 are respectively connected to the oil discharge mechanism 4 and the oil delivery mechanism 5 through the second oil pipe 14. A fine filter 18 is provided below the oil purification mechanism 6, and a second bracket 19 is provided above the fine filter 18. A heating and settling device 20 is provided on the inner side of the second bracket 19. A coarse filter plate 21 is provided inside the heating and settling device 20. Temperature control devices 22 are provided on the left and right sides below the heating and settling device 20. A heating plate 23 is provided at the contact point between the temperature control device 22 and the heating and settling device 20. The heating and settling device 20 is connected to the fine filter 18 through a second connecting pipe 24; the oil filtering mechanism 7 includes a vacuum dehydration oil filter 25, and an active oil pipe 26 is provided in front of the vacuum dehydration oil filter 25.

[0033] For better effect, the fine filter 18 adopts HN type fine filter, the coarse filter plate 21 is an obtuse inverted "V" structure, the heating plate 23 is an arc structure, and the vacuum dehydration oil filter 25 adopts zjd-f type oil filter.

[0034] The hydraulic lifting mechanism 8 includes a base 81 and a workbench 82, a platform 821 is provided on the workbench 82, an articulated lifting arm 83 is provided between the base 81 and the workbench 82, and the parallel articulated lifting arms 83 above the base 81 are connected by parallel connecting rods 84, a mounting seat 85 is provided above the base 81, a hydraulic rod 86 is provided on the right side of the mounting seat 85, a cross bar 87 is provided on the inner side of the hinge at both ends of the articulated lifting arm 83, a drive rod 88 is provided on the inner side of the cross bar 87, and the drive rod 88 is connected to the hydraulic rod 86 through a connecting flange 89.

[0035] The dual-tube adjustment mechanism 10 includes an inlet 101 connected to the first oil pipe 13, a flow meter 102 is provided below the inlet 101, branch pipes 103 are provided on the left and right sides of the flow meter 102, oil tanks 104 are provided below the branch pipes 103, valves 106 are provided below the oil tanks 104, and outlets 107 connected to the first connecting pipe 11 are provided below the valves 106. A controller 105 is provided in front of the oil tanks 104, and the controller 105 is connected to the valve 106 via a control line 108.

[0036] A mounting flange 171 is provided below the oil level gauge 17, three windows 172 are provided above the oil level gauge 17, a pressure relief valve 173 is provided at the upper end of the oil level gauge 17, a locking frame 174 is provided outside the pressure relief valve 173, the pressure relief valve 173 is connected to the oil level gauge 17 via the locking frame 174, and the locking frame 174 is connected to the pressure relief valve 173 via a locking screw 175.

[0037] Several detachable radiators 28 are evenly arranged inside the transformer casing 27 from left to right, an oil drain valve 29 is provided at the lower left side of the transformer casing 27, an oil purifier 30 is provided on the right side of the transformer casing 27, a box cover 31 is provided above the transformer casing 27, several high and low voltage outlet insulating bushings 32 are provided above the box cover 31, an oil conservator 33 is provided on the right side of the box cover 31, an arc-shaped safety air duct 34 is provided above the oil conservator 33, and a desiccant 35 is provided below the oil conservator 33.

[0038] The oil drain valve 29 is connected to the oil drain mechanism 4 through the corresponding first oil pipe 13 , the oil purifier 30 is connected to the oil delivery mechanism 5 through the corresponding first oil pipe 13 , and the oil level gauge 17 is connected to the oil storage cabinet 33 through the mounting flange 171 .

[0039] The present invention is an oil changing device for replacing insulating oil in a heavily overloaded old transformer. During use, the oil drain mechanism is first connected to the oil drain valve 29 through the first oil pipe 13, and the oil drain valve 29 is opened. The old mineral oil in the transformer is accelerated and effectively extracted through the oil pump 9 and the double-tube regulating mechanism 10 to ensure the oil drain flow rate and efficiency. The extracted waste oil is sent to the heating and settling device 20, and the large particles of impurities in the waste oil are filtered through the coarse filter plate 21. The waste oil 20 is then left to stand by sedimentation to allow the impurities to fall and separate. The temperature control device 22 and the heating plate 23 are used to achieve rapid sedimentation of the waste oil, greatly shortening the sedimentation time. The higher the oil temperature, the smaller the viscosity, the easier it is for the impurities to fall, and the shorter the sedimentation time. The waste oil after degrading is processed through the fine filter 18 and reused, which is environmentally friendly. When the oil is drained, the oil drain valve 29 is closed, the oil level gauge 17 is installed and connected to the oil storage cabinet 33, the oil delivery mechanism is connected to the oil purifier 30 through the first oil pipe 13, and then new oil is injected into the vacuum dehydration oil filter 25 through the source oil pipe 26, and the new oil is delivered to the transformer by the oil pump 9 and the double-tube regulating mechanism 10 to ensure the oil delivery flow and efficiency. The new oil is subjected to multi-stage treatment by the vacuum dehydration oil filter 25 and the oil purifier 30 to solve the problem of excessive water content in the oil, filter and remove trace particulate impurities in the insulating oil, avoid affecting the oil quality, and improve the oil change effect. The present invention is actually used During use, the height can also be adjusted by the hydraulic lifting mechanism 8. The hydraulic rod 86 drives the articulated lifting arm 83 to move through the driving rod 88, so that the articulated lifting arms 83 on both sides rise or fall, thereby realizing the rise or fall of the workbench 82. The connecting rod 84 and the cross bar 87 provide stable support for the articulated lifting arm 83 to ensure safe and reliable operation of the lifting work. Since the articulated lifting arm 83 and the connecting rod 84 are arranged in parallel, the hydraulic rod 86 drives the articulated lifting arm 83 to rise to a height that is multiple times the height, thereby achieving a height adjustment effect. It can be applied to the replacement of transformer insulating oil at different heights, shortening the length of the first oil pipe 13, and saving oil draining or oil delivery. time, improves work efficiency, and is highly practical; the double-tube adjustment mechanism 10 can further improve work efficiency; during the oil delivery process, the oil level is monitored in real time by the oil level gauge 17. When a blue mark appears in the three-sided windows 172 on the upper part of the oil level gauge 17, the oil level is above the tank cover 31, and it is a normal oil level. If a red mark appears in the three-sided windows 172, the oil level is below the tank cover 31, and the oil level is abnormal and needs to be replenished. The pressure relief valve 173 at the top of the oil level gauge 17 can be opened in time to release the pressure after the pressure rises, so as to prevent danger and improve safety performance. The present invention has the advantages of reasonable structure, easy use, good oil change effect, high oil change efficiency, and no effect on oil quality.

Claims

1. An oil changing device for replacing insulating oil in heavily overloaded old transformers, comprising a frame, an oil drain mechanism, an oil delivery mechanism, and a transformer housing, characterized in that: The frame is provided with movable wheels on both sides, a storage box is provided on the left side below the frame, an oil level gauge is provided inside the storage box, an oil discharge mechanism and an oil delivery mechanism are provided on the left and right sides above the frame respectively, an oil purification mechanism and an oil filter mechanism are provided inside the oil discharge mechanism and the oil delivery mechanism respectively, a hydraulic lifting mechanism is provided below the oil discharge mechanism and the oil delivery mechanism, an oil pump is provided above the hydraulic lifting mechanism, a second oil pipe is provided on the right side of the oil pump, a support is provided below the second oil pipe, a supporting roller is provided above the support, a double-tube adjusting mechanism is provided on the outside of the oil pump, the double-tube adjusting mechanism is connected to the oil pump through a first connecting pipe, a first bracket is provided in front of the double-tube adjusting mechanism, and a first oil pipe is provided above the double-tube adjusting mechanism; The oil purification mechanism and the oil filtering mechanism are respectively connected to the oil discharge mechanism and the oil delivery mechanism through a second oil pipe. A fine filter is provided below the oil purification mechanism, a second bracket is provided above the fine filter, a heating and settling device is provided inside the second bracket, a coarse filter plate is provided inside the heating and settling device, temperature control devices are provided on both sides below the heating and settling device, heating plates are provided at the contact points between the temperature control device and the heating and settling device, and the heating and settling device is connected to the fine filter through a second connecting pipe; the oil filtering mechanism includes a vacuum dehydration oil filter, and an active oil pipe is provided in front of the vacuum dehydration oil filter; The dual-tube adjustment mechanism includes an inlet connected to the first oil pipe, a flow meter is provided below the inlet, branch pipes are provided on the left and right sides of the flow meter, oil tanks are provided below the branch pipes, valves are provided below the oil tanks, outlets connected to the first connecting pipe are provided below the valves, a controller is provided in front of the oil tank, and the controllers are connected to the valves through control lines.

2. The oil changing device for replacing insulating oil in a heavily overloaded old transformer according to claim 1, characterized in that: The fine filter adopts HN type fine filter, the coarse filter plate is of obtuse inverted "V" structure, the heating plate is of arc structure, and the vacuum dehydration oil filter adopts zjd-f type oil filter.

3. The oil changing device for replacing insulating oil in a heavily overloaded old transformer according to claim 1, characterized in that: The hydraulic lifting mechanism includes a base and a workbench, a platform is provided on the workbench, an articulated lifting arm is provided between the base and the workbench, the parallel articulated lifting arms above the base are connected by parallel connecting rods, a mounting seat is provided above the base, a hydraulic rod is provided on the right side of the mounting seat, a cross bar is provided on the inner side of the hinge at both ends of the articulated lifting arm, a drive rod is provided on the inner side of the cross bar, and the drive rod is connected to the hydraulic rod through a connecting flange.

4. The oil changing device for replacing insulating oil in a heavily overloaded old transformer according to claim 1, characterized in that: A mounting flange is provided below the oil level gauge, three viewing windows are provided above the oil level gauge, a pressure relief valve is provided at the upper end of the oil level gauge, a locking frame is provided outside the pressure relief valve, the pressure relief valve is connected to the oil level gauge via the locking frame, and the locking frame is connected to the pressure relief valve via a locking screw.

5. The oil changing device for replacing insulating oil in a heavily overloaded old transformer according to claim 1, characterized in that: Several detachable radiators are evenly arranged inside the transformer box from left to right, an oil drain valve is provided at the lower left side of the transformer box, an oil purifier is provided on the right side of the transformer box, a box cover is provided above the transformer box, several high and low voltage outlet insulating bushings are provided above the box cover, an oil conservator is provided on the right side of the box cover, an arc-shaped safety airway is provided above the oil conservator, and a desiccant is provided below the oil conservator.

6. The oil changing device for replacing insulating oil in a heavily overloaded old transformer according to claim 5, characterized in that: The oil drain valve is connected to the oil drain mechanism through a corresponding first oil pipe, the oil purifier is connected to the oil delivery mechanism through a corresponding first oil pipe, and the oil level gauge is connected to the oil storage cabinet through a mounting flange.

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