Transformer vacuum oiling device with liquid level detection function

Abstract

The invention relates to the technical field of transformer oil injection, and particularly discloses a transformer vacuum oil injection device with a liquid level detection function, which comprises an oil tank, an oil pipe is mounted in the side wall of the oil tank, the oil pipe and an electromagnetic valve fixedly mounted on the outer side wall of the oil tank jointly form an oil injection channel, and the electromagnetic valve is communicated with external oil injection equipment. A cavity is further formed in the side wall of the oil tank, a plurality of adjusting plates capable of sliding are installed on the inner side wall of the cavity, and the adjusting plates can form a disc used for blocking the oil injection channel when sliding centripetally. The liquid level measuring device is switched between the two states, when the oil liquid level gradually rises to be close to the preset liquid level, the oil injection speed is reduced in time, so that the situation that the oil level exceeds or is lower than the preset oil level when oil injection of an oil tank is stopped due to the too high oil injection speed is avoided, oil is prevented from overflowing or damaging the internal structure of a transformer, and the safety of the transformer is improved. Or part of the winding is exposed in the air, so that the insulating property is reduced, and the risk of electrical faults is increased.

Description

Technical Field

[0001] The invention relates to the technical field of transformer oil filling, in particular to a transformer vacuum oil filling device with liquid level detection. Background Art

[0002] Transformer is a device used for electric energy conversion and is widely used in power systems. The cooling method of the transformer is crucial to its performance and life. At present, in the cooling system of the transformer, the cooling principle of the oil-immersed transformer usually involves mineral oil as the internal cooling medium, and the transformer oil also has an insulating effect, which can effectively isolate the high-voltage electric field inside the transformer and prevent current leakage. Therefore, vacuum oil filling should be used when filling the transformer with oil to avoid air or moisture affecting the insulation of the oil.

[0003] For example, Chinese patent number CN114823074B discloses a vacuum oil filling device for manufacturing amorphous alloy transformers, including a box with an oil meter, a partition fixedly connected to the inner wall of the box, the box is divided into an oil storage chamber and a working chamber by the partition, a connecting pipe for connecting to the transformer is provided in the middle of the upper surface of the box, and a protective box is fixedly connected to the lower surface of the box, and also includes: a filter assembly, located on one side of the box corresponding to the partition, for filtering the stored oil in the box. Through the arrangement of the box, partition, connecting pipe, oil supply assembly, moving assembly and lifting assembly, when the device needs to be used to vacuum oil the transformer, the staff only needs to start the lifting assembly to contact the moving assembly with the ground, so as to facilitate the staff to move the device to the designated position, thereby effectively improving the staff's handling efficiency, achieving the effect of saving time and effort, and being convenient and fast.

[0004] However, when the above-mentioned device is filling the transformer tank with oil, the filling speed cannot be regulated, so that the oil level cannot be accurately controlled when it is about to approach the preset oil level, resulting in too much or too little insulating oil. When the oil level overflows, it will cause damage to the internal structure of the transformer. When the oil level is lower than the preset oil level, part of the winding may be exposed to the air, resulting in a decrease in insulation performance and an increased risk of electrical failure. Summary of the invention

[0005] The object of the present invention is to provide a transformer vacuum oil filling device with liquid level detection to solve at least one technical problem existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a transformer vacuum oil filling device with liquid level detection, comprising an oil tank, an oil pipe is installed in the side wall of the oil tank, the oil pipe and a solenoid valve fixedly installed on the outer side wall of the oil tank together form an oil filling channel, the solenoid valve is connected to an external oil filling device, a cavity is also opened in the side wall of the oil tank, a plurality of slidable adjustment plates are installed on the inner side wall of the cavity, and the plurality of adjustment plates can form a disc for blocking the oil filling channel when sliding centrifugally, and can open the oil filling channel when sliding centrifugally;

[0007] It also includes a liquid level measuring component, which has two states. In state one, when the oil level approaches a preset level, the liquid level measuring component drives the adjusting plate to slide centripetally and gradually reduce the flow diameter of the oil injection channel. In state two, when the oil level reaches the preset level, the liquid level measuring component drives the adjusting plate to completely close the oil injection channel.

[0008] Preferably, the liquid level measuring assembly comprises a rotating disk rotatably mounted on the inner side wall of the cavity, a plurality of arc grooves corresponding to the adjustment plates are provided on one side wall of the rotating disk, a limit pin capable of sliding in the arc groove is provided on the outer wall of each adjustment plate, a curved groove is provided on the other side wall of the rotating disk, a sliding sleeve is slidably mounted in the cavity, a limit block capable of sliding in the curved groove is fixedly mounted on the side wall of the sliding sleeve, a sliding block is slidably mounted in the sliding sleeve, and a pressure plate capable of sliding along the inner side wall of the oil tank is fixedly mounted on the top surface of the sliding block;

[0009] The liquid level measurement assembly further comprises a first damper and a second damper for limiting the sliding block from sliding downward, and the resistance of the second damper is greater than that of the first damper.

[0010] Preferably, the first damping comprises an elastic member provided between the bottom end of the sliding block and the inner bottom surface of the sliding sleeve.

[0011] Preferably, the second damping includes a fixed sleeve fixedly mounted on the side wall of the rotating disk, an upper rotating handle fixedly mounted on one end of the fixed sleeve, a lower rotating handle also rotatably mounted on the end of the fixed sleeve, and a first tension spring is provided between the ends of the upper rotating handle and the lower rotating handle that are away from each other.

[0012] The top end face of said sliding arm is fixedly provided with a toothed plate, and the toothed plate is connected with a toothed plate by a threaded groove, and the toothed plate is connected with a toothed plate at two ends thereof of said toothed plate.

[0013] Preferably, a fixed sleeve is fixedly mounted on the inner wall of the connector, a plurality of rotation limit blocks in contact with the rotating shaft of the rotating wheel are fixed to the inner ring of the fixed sleeve, and the rotation limit blocks are all arranged to be inclined in the same direction.

[0014] Preferably, two shift pins are fixedly mounted on the side wall of the oil tank, and the upper rotating handle is located between the two shift pins. Pressure sensors are installed inside the two shift pins, and the part of the pressure sensor that passes through the oil tank is electrically connected to a warning light.

[0015] Preferably, a grip rod is rotatably mounted on the side wall of the oil tank, a portion of the grip rod that penetrates into the oil tank is fixedly connected to a shifting rod, and a portion of the grip rod that penetrates out of the oil tank is fixedly connected to a rotating handle.

[0016] Preferably, the external oil injection equipment includes a vacuum pump device, a filtering system, a vacuum system, a heater and a pressure release device.

[0017] Preferably, the top surface of the floating plate is provided with friction patterns which can increase contact friction.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention switches the liquid level measuring device between two groups of states. When the oil level gradually rises to a preset level, the oil filling rate is reduced in time to avoid the oil filling rate being too fast, resulting in the oil level exceeding or falling below the preset level when the oil tank is stopped from filling, affecting the cooling effect of the transformer, avoiding oil overflow or damage to the internal structure of the transformer, or exposing part of the winding to the air, resulting in a decrease in insulation performance and an increased risk of electrical failure.

[0020] 2. The present invention sets a first damper and a second damper for limiting the downward sliding of the sliding block, so that the oil level can maintain the maximum rate to fill the oil tank before triggering the liquid level measuring component, avoiding premature triggering of the liquid level measuring component and reducing the diameter of the oil filling channel.

[0021] 3. The present invention detects that when the liquid level is about to reach a preset level through the pressure of the oil on the pressure plate, the torque of the first tension spring on the upper rotating handle and the lower rotating handle is zero, and further oil is added to the oil tank until the oil level reaches the preset level. The tension of the first tension spring is used to instantly rotate the rotating disk to the maximum rotation position, and at the same time, the adjustment plate is driven to slide centripetally quickly to complete the closure, thereby completing the blocking of the oil filling channel, thereby achieving the purpose of accurately controlling the oil level and preventing the liquid level from being higher or lower than the preset level. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a cross-sectional view of the three-dimensional structure of the present invention;

[0024] Figure 3 Schematic diagram of the three-dimensional structure of the cavity in the present invention;

[0025] Figure 4 It is a side cross-sectional view of the present invention;

[0026] Figure 5 Schematic diagram of the three-dimensional exploded structure of the liquid level measurement component in the present invention Figure 1 ;

[0027] Figure 6 Schematic diagram of the three-dimensional exploded structure of the liquid level measurement component in the present invention Figure 2 ;

[0028] Figure 7 It is a three-dimensional structural schematic diagram of the lower rotating handle and its related structures of the present invention;

[0029] Figure 8 It is a three-dimensional structural cross-sectional view of the lower rotating handle and its related structures of the present invention;

[0030] Fig. 9 It is a schematic diagram of the fixed sleeve shaft and its internal structure of the present invention.

[0031] In the figure: 1. oil tank; 2. grip; 3. pressure sensor; 4. solenoid valve; 5. cavity; 6. adjustment plate; 7. rotating disk; 8. fixed sleeve; 9. upper rotating handle; 10. sliding sleeve; 11. pressure plate; 12. arc groove; 13. bent groove; 14. sliding block; 15. lower rotating handle; 16. resistance plate; 17. cutting groove; 18. sliding cylinder; 19. sliding ring; 20. connector; 21. rotating wheel; 22. compression spring; 23. fixed pin shaft; 24. fixed bushing; 25. rotating limit block; 26. lever; 27. floating plate; 28. first tension spring; 29. ​​second tension spring; 30. bushing; 31. piston rod; 32. elastic pin; 33. contact piece. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0033] See also Figures 1 to 9 The present invention provides a technical solution: a transformer vacuum oil filling device with liquid level detection, comprising an oil tank 1, an oil pipe is installed in the side wall of the oil tank 1, the oil pipe and the electromagnetic valve 4 fixedly installed on the outer side wall of the oil tank 1 together form an oil filling channel, the electromagnetic valve 4 is connected to an external oil filling device, and a cavity 5 is also opened in the side wall of the oil tank 1, and a plurality of slidable adjustment plates 6 are installed on the inner side wall of the cavity 5, and the plurality of adjustment plates 6 can form a disc for blocking the oil filling channel when sliding centrifugally, and can open the oil filling channel when sliding centrifugally;

[0034] It also includes a liquid level measuring component, which has two states. In state one, when the oil level approaches a preset level, the liquid level measuring component drives the adjusting plate 6 to slide centripetally and gradually reduce the flow diameter of the oil injection channel. In state two, when the oil level reaches the preset level, the liquid level measuring component drives the adjusting plate 6 to completely close the oil injection channel.

[0035] When the device is in use, the external oil filling device is first connected to the solenoid valve 4, and then the solenoid valve 4 is opened, and the oil tank 1 is evacuated by the external oil filling device to remove the gas and moisture inside the oil tank 1. After the vacuuming is completed, the vacuum in the oil tank 1 is maintained by the external oil filling device, and oil is filled into the oil tank 1. When the liquid level measuring component detects that the oil level is close to the preset liquid level, the liquid level measuring component drives the adjustment plate 6 to slide centripetally to reduce the flow diameter of the oil filling channel, and as the oil level gets closer and closer to the preset liquid level, the flow diameter is also reduced synchronously, until the oil level reaches the preset liquid level, the liquid level measuring component switches to state two, and completely closes the oil filling channel by driving the adjustment plate 6, and then closes the solenoid valve 4 to complete the oil filling in the oil tank 1.

[0036] In this way, by switching the liquid level measuring device between the two groups of states, when the oil level gradually rises to close to the preset level, the oil filling rate is timely reduced to avoid the oil filling rate being too fast, resulting in the oil level exceeding or falling below the preset oil level when the oil tank 1 is stopped from filling, thereby affecting the cooling effect of the transformer, avoiding oil overflow or damage to the internal structure of the transformer, or exposing part of the winding to the air, resulting in a decrease in insulation performance and an increased risk of electrical failure.

[0037] Further, the liquid level measuring assembly includes a rotating disk 7 rotatably mounted on the inner side wall of the cavity 5, a plurality of arc grooves 12 corresponding to the adjustment plates 6 are provided on one side wall of the rotating disk 7, and a limit pin capable of sliding in the arc groove 12 is provided on the outer wall of each adjustment plate 6, a curved groove 13 is provided on the other side wall of the rotating disk 7, a sliding sleeve 10 is slidably mounted in the cavity 5, and a limit block capable of sliding in the curved groove 13 is fixedly mounted on the side wall of the sliding sleeve 10, a sliding block 14 is slidably mounted in the sliding sleeve 10, and a pressure plate 11 capable of sliding along the inner side wall of the oil tank 1 is fixedly mounted on the top surface of the sliding block 14;

[0038] The liquid level measurement assembly further includes a first damper and a second damper for limiting the sliding block 14 from sliding downward, and the resistance of the second damper is greater than that of the first damper.

[0039] According to the above embodiment, a specific embodiment of a liquid level measurement assembly is provided. Figure 5 and Figure 6When the oil level in the oil tank 1 gradually rises, the pressure of the insulating oil on the pressure plate 11 becomes greater and greater, and the pressure plate 11 is pressed to slide downward. Since the resistance of the second damping is greater than the first damping, before the oil level rises to trigger the state of the liquid level measuring component, the pressure plate 11 and the sliding block 14 slide downward and will not contact the bottom of the sliding sleeve 10, that is, at this time, the downward sliding of the pressure plate 11 cannot drive the sliding sleeve 10 to slide downward together, so as to avoid the liquid level measuring component being triggered too early and reducing the oil filling rate in advance, resulting in a reduction in the overall oil filling rate and an increase in the oil filling time, thereby increasing the operating cost of the device. When the oil level approaches the preset level, the pressure plate 11 and the sliding block 14 move downward. When the sliding sleeve 10 breaks through the first damping, it drives the sliding sleeve 10 to slide downward. At this time, the liquid level measurement component triggers stage one and the pressure plate 11 slides downward to enter the resistance range of the second damping. When the sliding sleeve 10 slides downward, it drives the limit block to slide in the curved groove 13 and drives the rotating disk 7 to start rotating. When the rotating disk 7 rotates, it drives the limit pin on the outer wall of the adjusting plate 6 to slide in the arc groove 12, so that the adjusting plate 6 slides centripetally together, reducing the diameter of the oil injection channel and thus reducing the oil injection rate. When the oil level reaches the preset level, the liquid level measurement component triggers state two, and the adjusting plate 6 slides centripetally to form a disc and completes the blocking of the oil injection channel, stopping the oil injection into the oil tank 1.

[0040] In this way, by setting the first damping and the second damping for limiting the sliding block 14 from sliding downward, the oil level can maintain the maximum rate to fill the oil tank 1 before triggering the liquid level measurement component, avoiding the liquid level measurement component from being triggered in advance and reducing the diameter of the oil filling channel.

[0041] Furthermore, the first damping includes an elastic member provided between the bottom end of the sliding block 14 and the inner bottom surface of the sliding sleeve 10 .

[0042] According to the above embodiment, a specific implementation of the first damping is provided, by means of an elastic member between the bottom end of the sliding block 14 and the inner bottom surface of the sliding sleeve 10, it can be ensured that the downward movement of the pressure plate 11 before the oil level triggers the liquid level measuring component state 1 will not drive the sliding sleeve 10 to slide down together, and when the pressure of the oil on the pressure plate 11 completely breaks through the resistance of the elastic member, that is, the liquid level measuring component is triggered to state 1, the downward movement of the pressure plate 11 will drive the sliding sleeve 10 to slide down together.

[0043] Furthermore, the second damping includes a fixed sleeve 8 fixedly mounted on the side wall of the rotating disk 7, an upper rotating handle 9 is fixedly mounted on one end of the fixed sleeve 8, a lower rotating handle 15 is also rotatably mounted on the end of the fixed sleeve 8, and a first tension spring 28 is provided between the ends of the upper rotating handle 9 and the lower rotating handle 15 that are away from each other.

[0044] According to the above embodiment, a specific implementation of the second damping is provided. Figure 4When the liquid level measuring component is in the trigger state 1, the rotation of the rotating disk 7 needs to break through the resistance of the first tension spring 28 to drive the upper rotating handle 9 to rotate clockwise, that is, the pressure of the oil on the pressure plate 11 is greater than the tension of the first tension spring 28. Due to the rising liquid level, the floating plate 27 gradually breaks through the tension of the second tension spring 29 and floats to contact with the lower rotating handle 15 and limits its rotation. At this time, under the action of the first tension spring 28, the upper rotating handle 9 rotates clockwise while driving the lower rotating handle 15 to rotate counterclockwise until the upper rotating handle 9 and the lower rotating handle 15 are in the same straight line. At this time, the rotation torque of the first tension spring 28 on the upper rotating handle 9 and the lower rotating handle 15 is zero. When the oil level reaches the preset oil level, the upper rotating handle 9 and the lower rotating handle 15 rotate further, and quickly approach each other under the action of the first tension spring 28, pulling the adjustment plate 6 to quickly slide centripetally to complete the closure, thereby completing the blocking of the oil filling channel.

[0045] In this way, when the liquid level is about to reach the preset level through the pressure of the oil on the pressure plate 11, the rotational torque of the first tension spring 28 on the upper rotating handle 9 and the lower rotating handle 15 is made zero, and further oil is added to the oil tank 1 until the oil level reaches the preset level. The tension of the first tension spring 28 is used to instantly rotate the rotating disk 7 to the maximum rotation position, and at the same time drive the adjustment plate 6 to slide centripetally quickly to complete the closing, thereby completing the blocking of the oil filling channel, thereby achieving the purpose of accurately controlling the oil level and preventing the liquid level from being higher or lower than the preset level.

[0046] Furthermore, a slot 17 is provided at one end of the lower rotating handle 15, a sliding cylinder 18 is provided in the slot 17, a fixed pin 23 is fixedly installed between the side walls on both sides of the slot 17, and a through slot for the fixed pin 23 to rotate and slide is provided on the outer surface of the sliding cylinder 18, elastic pins 32 that can limit the rotation of the sliding cylinder 18 are also fixedly installed on the side walls on both sides of the slot 17, a sleeve 30 is rotatably installed on the outer wall of the fixed pin 23, a piston rod 31 is fixedly connected to the bottom end of the sleeve 30, a piston cavity for the piston rod 31 to be inserted is also provided in the sliding cylinder 18, and the bottom surface of the piston cavity is fixed. A contact piece 33 is installed, a sliding ring 19 is slidably installed on the outer wall of the sliding cylinder 18, a connector 20 is fixedly installed on the bottom end of the sliding cylinder 18, a compression spring 22 is provided between the sliding ring 19 and the connector 20, a rotating wheel 21 that can only rotate in one direction is installed in the connector 20, a floating plate 27 is slidably installed on the inner wall of the oil tank 1, a second tension spring 29 is provided between the bottom of the floating plate 27 and the bottom surface of the oil tank 1, a resistance plate 16 is horizontally slidably installed on the inner wall of the oil tank 1, a straight groove is opened in the resistance plate 16, and a pin rod that can slide in the straight groove is fixedly installed on the side wall of the lower rotating handle 15.

[0047] According to the above implementation, it can be seen that Figure 4When the liquid level measurement component triggers state 2, that is, after the adjustment plate 6 completely blocks the oil filling channel, the oil tank 1 is left still until the insulating oil reaches the use standard, and then the transformer is started and the insulating oil in the oil tank 1 is circulated in the oil tank 1 through the external circulation pump. The insulating oil absorbs the excess heat of the transformer and dissipates the heat through the heat sink outside the oil tank 1. Since the insulating oil will gradually age when circulating in the oil tank 1 for heat dissipation, the aging of the insulating oil will cause the viscosity of the insulating oil to gradually increase. Therefore, when the insulating oil in the oil tank 1 flows, it will drive the resistance plate 16 to move continuously to the left. Since the elastic pins 32 on both sides of the groove 17 are inserted into the grooves provided on the outer surface of the sliding cylinder 18, please refer to the specific Figure 7 and Figure 8 , so that the sliding cylinder 18 and the lower rotating handle 15 are in the same straight line and rotate clockwise together. At this time, the wheel 21 rolls along the surface of the floating plate 27. If the insulating oil ages normally, the increasing viscosity makes the insulating oil push the resistance plate 16 more and more when it flows through the resistance plate 16, until the lower rotating handle 15 is reset under the tension of the first tension spring 28. This indicates that the insulating oil has aged too much, making it unable to complete the heat dissipation and insulation of the transformer. At this time, the unit should be suspended, and the insulating oil should be further tested or replaced.

[0048] If the resistance plate 16 suddenly slides to the right during the process of sliding to the left, it indicates that the insulating oil may decompose due to overheating, resulting in a sudden decrease in viscosity. This change can be used as a warning signal for overheating. Since the wheel 21 can only roll in one direction, when the lower rotating handle 15 drives the sliding cylinder 18 to rotate counterclockwise, the excessive friction between the wheel 21 and the floating plate 27 will cause the elastic pin 32 to slip out of the groove on the outer surface of the sliding cylinder 18, releasing the rotation limit of the sliding cylinder 18. The sliding cylinder 18 starts to rotate under the action of the compression spring 22, and drives the piston rod 31 to rise, disengage from the contact piece 33, and issue a warning through the external structure electrically connected to the contact piece 33 to avoid further decomposition of the insulating oil and reduce the insulation. At this time, the unit operation should be suspended to further test the insulating oil or replace the insulating oil.

[0049] Furthermore, a fixed sleeve 24 is fixedly mounted on the inner wall of the connector 20 , and a plurality of rotation limit blocks 25 in contact with the rotating shaft of the rotating wheel 21 are fixed to the inner ring of the fixed sleeve 24 , and the rotation limit blocks 25 are all inclined in the same direction.

[0050] According to the above implementation, it can be seen that Fig. 9 When the shaft of the rotating wheel 21 rotates clockwise, the rotation limit block 25 is inclined in the rotation direction of the shaft and will not hinder the rotation of the rotating wheel 21. When the shaft of the rotating wheel 21 rotates counterclockwise, the rotation limit block 25 cannot reach a vertical state, which increases the friction with the shaft and makes the rotating wheel 21 unable to rotate, completing the unidirectional rotation restriction of the rotating wheel 21 mentioned above.

[0051] Furthermore, two shift pins are fixedly installed on the side wall of the oil tank 1, and the upper rotating handle 9 is located between the two shift pins. Pressure sensors 3 are installed inside the two shift pins, and the part of the pressure sensor 3 that passes through the oil tank 1 is electrically connected to a warning light.

[0052] According to the above implementation, it can be seen that Figure 4 When the upper rotating handle 9 is rotated to contact the right gear pin, it indicates that the adjustment plate 6 has been completely closed and the oil filling pipeline has been blocked, and the warning light electrically connected to the pressure sensor 3 is used to remind the outside world. At this time, the solenoid valve 4 can be closed. When the upper rotating handle 9 is rotated to contact the left gear pin, it indicates that the aging of the insulating oil has reached the limit of use. The warning light electrically connected to the pressure sensor 3 is used to remind the outside world. At this time, the unit must be shut down immediately to further test the insulating oil or replace the insulating oil.

[0053] Furthermore, a grip rod 2 is rotatably mounted on the side wall of the fuel tank 1 , a portion of the grip rod 2 that penetrates into the fuel tank 1 is fixedly connected to a lever 26 , and a portion of the grip rod 2 that penetrates out of the fuel tank 1 is fixedly connected to a rotating handle.

[0054] According to the above embodiment, if the aging of the insulating oil during the use of the transformer does not increase the viscosity of the insulating oil to drive the lower rotating handle 15 to cross the first tension spring 28 where the torque is zero, that is, the insulating oil can still be used normally afterwards, at this time, because the lower rotating handle 15 does not drive the upper rotating handle 9 to reset together, the adjustment plate 6 is still in a closed state under the action of the first tension spring 28, and the upper rotating handle 9 and the lower rotating handle 15 can be reset together by rotating the rotating handle, so that the adjustment plate 6 slides centrifugally to release the blockage of the oil injection channel.

[0055] Furthermore, the external oil injection equipment includes a vacuum pump device, a filtering system, a vacuum system, a heater and a pressure release device.

[0056] According to the above implementation, it can be known that the oil filling and vacuuming of the oil tank 1 can be completed by cooperating with the vacuum pump equipment, the filtering system, the vacuum system, the heater and the pressure release device. The specific work flow can be realized by those skilled in the art, so it will not be described in detail in this case.

[0057] Furthermore, the top surface of the floating plate 27 is provided with friction patterns that can increase contact friction.

[0058] According to the above embodiment, by setting friction grooves that can increase contact friction on the top surface of the floating plate 27, when the resistance plate 16 slides to the right, the sliding cylinder 18 can more easily break through the restriction of the elastic pin 32 to release the rotation restriction, thereby avoiding desensitization of the device to a small degree of dissolution of the insulating oil.

[0059] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transformer vacuum oil filling device with liquid level detection, comprising an oil tank (1), characterized in that: An oil pipe is installed in the side wall of the oil tank (1), and the oil pipe and a solenoid valve (4) fixedly installed on the outer side wall of the oil tank (1) together form an oil injection channel, and the solenoid valve (4) is connected to an external oil injection device. A cavity (5) is also opened in the side wall of the oil tank (1), and a plurality of slidable adjustment plates (6) are installed on the inner side wall of the cavity (5), and the plurality of adjustment plates (6) can form a disk for blocking the oil injection channel when sliding centrifugally, and can open the oil injection channel when sliding centrifugally; It also includes a liquid level measuring component, which has two states: in state one, when the oil level approaches a preset level, the liquid level measuring component drives the adjusting plate (6) to slide centripetally and gradually reduce the flow diameter of the oil injection channel; in state two, when the oil level reaches the preset level, the liquid level measuring component drives the adjusting plate (6) to completely close the oil injection channel.

2. The transformer vacuum oil filling device with liquid level detection according to claim 1 is characterized in that: The liquid level measuring assembly comprises a rotating disk (7) rotatably mounted on the inner side wall of the cavity (5); a plurality of arc grooves (12) corresponding to the adjustment plates (6) are provided on one side wall of the rotating disk (7); a limit pin capable of sliding in the arc groove (12) is provided on the outer wall of each adjustment plate (6); a curved groove (13) is provided on the other side wall of the rotating disk (7); a sliding sleeve (10) is slidably mounted in the cavity (5); a limit block capable of sliding in the curved groove (13) is fixedly mounted on the side wall of the sliding sleeve (10); a sliding block (14) is slidably mounted in the sliding sleeve (10); a pressure plate (11) capable of sliding along the inner side wall of the oil tank (1) is fixedly mounted on the top surface of the sliding block (14); The liquid level measurement assembly also includes a first damper and a second damper for limiting the sliding block (14) from sliding downward, and the resistance of the second damper is greater than that of the first damper.

3. The transformer vacuum oil filling device with liquid level detection according to claim 2 is characterized in that: The first damping comprises an elastic member arranged between the bottom end of the sliding block (14) and the inner bottom surface of the sliding sleeve (10).

4. The transformer vacuum oil filling device with liquid level detection according to claim 2 is characterized in that: The second damping comprises a fixed sleeve (8) fixedly mounted on the side wall of the rotating disk (7), an upper rotating handle (9) being fixedly mounted on one end of the fixed sleeve (8), a lower rotating handle (15) being rotatably mounted on the end of the fixed sleeve (8), and a first tension spring (28) being provided between the ends of the upper rotating handle (9) and the lower rotating handle (15) which are away from each other.

5. The transformer vacuum oil filling device with liquid level detection according to claim 4 is characterized in that: A slot (17) is provided at one end of the lower rotating handle (15), a sliding cylinder (18) is provided in the slot (17), a fixed pin shaft (23) is fixedly installed between the side walls on both sides of the slot (17), and a through slot for the fixed pin shaft (23) to rotate and slide is provided on the outer surface of the sliding cylinder (18), elastic pins (32) that can limit the rotation of the sliding cylinder (18) are also fixedly installed on the side walls on both sides of the slot (17), a shaft sleeve (30) is rotatably installed on the outer wall of the fixed pin shaft (23), a piston rod (31) is fixedly connected to the bottom end of the shaft sleeve (30), a piston cavity for the piston rod (31) to be inserted is also provided in the sliding cylinder (18), and a contact piece is fixedly installed on the bottom surface of the piston cavity (33), a sliding ring (19) is slidably mounted on the outer wall of the sliding cylinder (18), a connector (20) is fixedly mounted on the bottom end of the sliding cylinder (18), a compression spring (22) is provided between the sliding ring (19) and the connector (20), a rotating wheel (21) that can only rotate in one direction is installed in the connector (20), a floating plate (27) is slidably mounted on the inner wall of the oil tank (1), a second tension spring (29) is provided between the bottom of the floating plate (27) and the bottom surface of the oil tank (1), a resistance plate (16) is horizontally slidably mounted on the inner wall of the oil tank (1), a straight groove is provided in the resistance plate (16), and a pin rod that can slide in the straight groove is fixedly mounted on the side wall of the lower rotating handle (15).

6. The transformer vacuum oil filling device with liquid level detection according to claim 5 is characterized in that: A fixed sleeve (24) is fixedly mounted on the inner wall of the connector (20), and a plurality of rotation limit blocks (25) in contact with the rotating shaft of the rotating wheel (21) are fixed to the inner ring of the fixed sleeve (24), and the rotation limit blocks (25) are all arranged to be inclined in the same direction.

7. The transformer vacuum oil filling device with liquid level detection according to claim 5 is characterized in that: Two shift pins are fixedly mounted on the side wall of the oil tank (1), and the upper rotating handle (9) is located between the two shift pins. Pressure sensors (3) are mounted inside the two shift pins, and the portion of the pressure sensor (3) that passes through the oil tank (1) is electrically connected to a warning light.

8. The transformer vacuum oil filling device with liquid level detection according to claim 1, characterized in that: A grip rod (2) is rotatably mounted on the side wall of the oil tank (1); the portion of the grip rod (2) that penetrates into the oil tank (1) is fixedly connected to a lever (26); and the portion of the grip rod (2) that penetrates out of the oil tank (1) is fixedly connected to a rotating handle.

9. The transformer vacuum oil filling device with liquid level detection according to any one of claims 1 to 8, characterized in that: The external oil injection equipment includes a vacuum pump device, a filtering system, a vacuum system, a heater and a pressure release device.

10. The transformer vacuum oil filling device with liquid level detection according to claim 5, characterized in that: The top surface of the floating plate (27) is provided with friction patterns which can increase contact friction.

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