Device for high-voltage insulation test

Abstract

The invention discloses a device for a high-voltage insulation test, and the device comprises a test housing which is composed of an integrated welding frame at the bottom and a top plate at the top, and the integrated welding frame is connected with the top plate in a welding manner. The lifting type storage mechanism comprises a transverse plate fixedly connected between the inner walls of the two sides of the bottom of the integrated welding frame, a hydraulic telescopic rod is installed at the lower end of the transverse plate, the telescopic end of the hydraulic telescopic rod is fixedly connected with a lifting plate, and the upper end of the lifting plate is fixedly connected with a connecting cylinder capable of storing insulating oil; and a detection mechanism matched with the connecting cylinder is mounted at the lower end of the top plate. In the actual using process of the device, oil body feeding is conducted through the bottom, the overall anti-explosion performance is effectively improved, in addition, a heating and oil body moving structure is further arranged, the insulating oil state in the actual using environment is simulated, and the actual using requirement is better met.

Description

Technical Field

[0001] This invention relates to the field of insulating oil testing, and more particularly to an apparatus for high-voltage insulation testing. Background Technology

[0002] To ensure the safe use of transformer insulating oil, it is often necessary to test its electrical properties. To address this, invention CN118362848A discloses a transformer insulating oil performance testing device, relating to the field of electrical performance testing. The device includes a housing and a door. An oil-filling assembly, comprising a fixed ring and an oil cup, is installed inside the housing. A lifting assembly, including a pressure plate and a motor, is installed on the pressure plate and the housing. A testing assembly, including a high-voltage power supply and electrode rods, is also installed on the housing. A protective assembly, including a resistor and a retainer, is installed on the housing. This transformer insulating oil performance testing device allows carbon dioxide from a gas tank to enter the inside of the oil cup through a pipe, pushing the air in the oil cup through the inner flap of the outlet and expelling it outwards. This isolates the transformer insulating oil from oxygen, preventing combustion or even explosion caused by the high temperature generated after a breakdown current. It is suitable for performance testing of transformer insulating oil. However, the above solution still has the following problems; 1. The operating door of the above-mentioned device is located on the front side, and it is difficult to make the connection between the door and the device explosion-proof. Although a pressure relief structure is set, if the pressure inside the container increases too quickly and the pressure relief structure cannot relieve the pressure in time, or if the pressure relief structure malfunctions, there is still a risk of explosion. 2. The test was conducted in a static oil bath environment, but in actual working conditions, the insulating oil is in a dynamic circulation state accompanied by local temperature rise, which leads to a deviation between the test results and the actual insulation performance of the equipment. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device for high-voltage insulation testing. In actual use, this device utilizes the bottom to release oil, effectively improving the overall explosion-proof performance. In addition, it is equipped with a heating and oil movement structure to simulate the state of insulating oil in actual use environments, which better meets the actual use requirements.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An apparatus for high-voltage insulation testing includes a test housing consisting of an integral welded frame at the bottom and a top plate at the top, the integral welded frame and the top plate being connected by welding; and a lifting storage mechanism including a horizontal plate fixedly connected between the inner walls of the two sides of the bottom of the integral welded frame, a hydraulic telescopic rod installed at the lower end of the horizontal plate, a lifting plate fixedly connected to the telescopic end of the hydraulic telescopic rod, a connecting cylinder for storing insulating oil fixedly connected to the upper end of the lifting plate, and a detection mechanism cooperating with the connecting cylinder installed at the lower end of the top plate.

[0005] Preferably, the upper end of the lifting plate is fixedly connected with multiple guide rods, the upper ends of the multiple guide rods all penetrate the top plate and are slidably connected to the top plate, and a sealing door is installed on the front side of the bottom part of the integrated welded frame.

[0006] Preferably, the detection mechanism includes multiple connecting frames fixedly connected to the lower end of the top plate, and a fixing plate is fixedly connected to the lower end of the multiple connecting frames. A sealing column is fixedly connected to the lower end of the fixing plate. An annular rubber sealing gasket is provided on the outer side of the sealing column and cooperates with the inner side of the connecting cylinder. Two pressure electrodes are symmetrically installed at the lower end of the sealing column.

[0007] Preferably, it further includes a gas-liquid flow mechanism, which includes two piston cylinders symmetrically fixedly connected to the upper end of a fixed plate. Each of the two piston cylinders is provided with a first piston block that can slide up and down. The lower end of each first piston block is elastically connected to the inner bottom of the piston cylinder through a second spring. The upper ends of the two first piston blocks are fixedly connected with connecting rods, and the upper ends of the two connecting rods are jointly fixedly connected with connecting strips.

[0008] Preferably, two vertical mounting plates are symmetrically fixedly connected to the upper end of the fixed plate. A drive motor is installed on the front side of the vertical mounting plate located on the front side. The output shaft of the drive motor passes through the front vertical mounting plate and is fixedly connected to a cam. The output shaft of the drive motor is fixedly connected to a rotating shaft, and the rear end of the rotating shaft is rotatably connected to the rear vertical mounting plate.

[0009] Preferably, the bottom spaces of both piston cylinders are connected to one-way pipes, and the other ends of both one-way pipes extend to the bottom of the fixed plate. The inner bottom spaces of both piston cylinders are connected to connecting channels, and the other ends of the two connecting channels are respectively connected to a first one-way channel and a second one-way channel. An electric heating ring is installed inside the second one-way channel. The other end of the first one-way channel is connected to the space above the fixed plate, and the other end of the second one-way channel is connected to the space below the fixed plate. A one-way valve for unidirectional fluid flow from bottom to top is installed inside the first one-way channel, and a one-way valve for unidirectional fluid flow from top to bottom is installed inside the second one-way channel.

[0010] Preferably, the connecting cylinder has a piston plate that can slide up and down inside, and the piston plate has a communication port. A manual valve is installed on the communication port. The inner bottom of the connecting cylinder is elastically connected to the piston plate by a first spring. The inner bottom of the connecting cylinder is connected to the outside through a circular opening. A first normally closed solenoid valve is installed inside the circular opening. A gas pressure sensor is installed on the side wall of the top space of the connecting cylinder. A display control panel is installed on the front side of the integrated welded frame. The display control panel is electrically connected to the gas pressure sensor and the first normally closed solenoid valve.

[0011] Preferably, a normally open solenoid valve is installed inside the first one-way channel, and a second normally closed solenoid valve is installed inside the second one-way channel.

[0012] Preferably, the inner top of the sealing column is provided with an installation groove, the upper end of the piston plate is fixedly connected with an abutment column, and a non-locking push switch is installed in the inner top of the installation groove. The non-locking push switch is electrically connected to the normally open solenoid valve and the second normally closed solenoid valve.

[0013] Preferably, a protective box is fixedly connected to the upper end of the top plate, and a columnar groove is provided on the right side of the protective box. A second piston block that can slide left and right is provided in the columnar groove. The left side of the second piston block is elastically connected to the left side wall of the columnar groove through a third spring. A pressure relief pipe is connected to the left side space of the columnar groove. A pressure relief valve is installed inside the pressure relief pipe. The other end of the pressure relief pipe passes through a sealing column.

[0014] Compared with the prior art, the beneficial effects of this invention are as follows: 1. The test housing of this invention is constructed by welding an integral frame and a top plate together. This integral welded structure possesses excellent explosion-proof performance. During the testing process, even in the event of an explosion, the integral welded frame and top plate can effectively withstand the blast impact, preventing fragments from flying and providing reliable safety protection for the entire device. This ensures the personal safety of operators and the safety of the surrounding environment, reducing losses caused by accidents.

[0015] 2. The testing mechanism, in conjunction with the gas-liquid flow mechanism, can achieve multiple testing modes. The normally open solenoid valve and the second normally closed solenoid valve, under different energizing states, can respectively achieve insulation testing by reducing the oxygen content of the testing environment to lower the possibility of explosion, simulating the flow state of insulating oil, and simulating the high-temperature flow state of insulating oil. This more comprehensively and realistically simulates the actual use environment of insulating oil, making the test results more consistent with reality.

[0016] 3. In the event of a rapid expansion due to an oil explosion, the pressure relief valve and pipe inside the protective box can promptly inject oil into the space on the left side of the columnar groove, using the third spring to buffer and store some of the oil; simultaneously, the piston plate inside the connecting cylinder moves down to compress the first spring, further buffering and storing the oil. This dual buffering protection mechanism, combined with the integrated welded test housing, effectively improves the overall safety of the device and reduces the damage caused by an explosion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a device for high-voltage insulation testing proposed in this invention; Figure 2 for Figure 1 Cross-sectional view; Figure 3 A schematic diagram showing the fit between the inspection structure and the connecting cylinder; Figure 4 for Figure 3 Top view; Figure 5 for Figure 4 AA-direction cross-section diagram; Figure 6 for Figure 5 Enlarged view of point C; Figure 7 for Figure 4 BB-direction cross-section diagram; Figure 8 This is an enlarged schematic diagram of the testing organization; Figure 9 for Figure 8 A schematic diagram of the front side of the cross-sectional structure.

[0018] In the diagram: 1. Integrated welded frame; 2. Display control panel; 3. Sealed door; 4. Top plate; 5. Horizontal plate; 6. Hydraulic telescopic rod; 7. Lifting plate; 8. Guide rod; 9. Electric heating ring; 10. U-shaped plate; 11. Connecting cylinder; 12. Protective box; 13. Pressure relief pipe; 14. Pressure relief valve; 15. Fixing plate; 16. Connecting frame; 17. Piston plate; 18. First spring; 19. Abutting column; 20. Connecting port; 21. Round port; 22. Pressurizing electrode; 23. One-way pipe; 24. Connecting strip; 25. Sealing column; 26. Mounting groove; 27. Non-locking push switch; 28. Gas pressure sensor; 29. ​​Piston cylinder; 30. Connecting rod; 31. First piston block; 32. Second spring; 33. Columnar groove; 34. Second piston block; 35. Third spring; 36. Vertical mounting plate; 37. Drive motor; 38. Cam; 39. Rotating shaft; 40. Connecting channel; 41. First one-way channel; 42. Second one-way channel. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] Reference Figures 1-9 A device for high-voltage insulation testing includes a test housing, which is composed of an integral welded frame 1 at the bottom and a top plate 4 at the top. The integral welded frame 1 and the top plate 4 are connected by welding. A sealing door 3 is installed on the front side of the bottom part of the integral welded frame 1. As one embodiment of the present invention, a lifting storage mechanism is also included. The lifting storage mechanism includes a horizontal plate 5 fixedly connected between the inner walls of both sides of the bottom of the integrated welded frame 1. A hydraulic telescopic rod 6 is installed at the lower end of the horizontal plate 5. A lifting plate 7 is fixedly connected to the telescopic end of the hydraulic telescopic rod 6. A connecting cylinder 11 for storing insulating oil is fixedly connected to the upper end of the lifting plate 7. When inserting or removing insulating oil from the connecting cylinder 11, the sealing door 3 can be opened, and then the hydraulic telescopic rod 6 can be retracted to its maximum extent. At this time, the connecting cylinder 11 will move down to its lowest position, allowing the operator to perform corresponding operations. During the testing process, the hydraulic telescopic rod 6 can be extended to its maximum extent, at which point the cylinder 11 is in the... Figure 2 In this location, even in the event of an explosion, the safety of the entire device can be guaranteed by utilizing the explosion-proof performance of the integrated welded frame 1 and the top plate 4. Multiple guide rods 8 are fixedly connected to the upper end of the lifting plate 7. The upper ends of the multiple guide rods 8 all penetrate the top plate 4 and are slidably connected to the top plate 4. The use of guide rods 8 makes the up-and-down movement of the lifting storage mechanism more stable.

[0021] In one embodiment of the present invention, a detection mechanism that cooperates with the connecting cylinder 11 is installed at the lower end of the top plate 4. The detection mechanism includes multiple connecting frames 16 fixedly connected to the lower end of the top plate 4. The lower ends of the multiple connecting frames 16 are fixedly connected to a fixing plate 15. A sealing column 25 is fixedly connected to the lower end of the fixing plate 15. An annular rubber sealing gasket is provided on the outer side of the sealing column 25 to ensure sliding sealing and cooperate with the inner side of the connecting cylinder 11. Two pressure electrodes 22 are symmetrically installed at the lower end of the sealing column 25. The insulation detection operation of the insulating oil can be performed by activating the pressure electrodes 22.

[0022] In one embodiment of the present invention, a gas-liquid flow mechanism is also included. This mechanism includes two piston cylinders 29 symmetrically fixedly connected to the upper end of a fixed plate 15. Each piston cylinder 29 contains a first piston block 31 that can slide up and down. The lower end of each first piston block 31 is elastically connected to the inner bottom of the piston cylinder 29 via a second spring 32. A connecting rod 30 is fixedly connected to the upper end of each of the two first piston blocks 31. A connecting strip 24 is fixedly connected to the upper end of both connecting rods 30. Two vertical mounting plates 36 are symmetrically fixedly connected to the upper end of the fixed plate 15. A drive motor 37 is mounted on the front side of the vertical mounting plate 36. The output shaft of the drive motor 37 passes through the front vertical mounting plate 36 and is fixedly connected to a cam 38. The output shaft of the drive motor 37 is fixedly connected to a rotating shaft 39. The rear end of the rotating shaft 39 is rotatably connected to the rear vertical mounting plate 36. Under the elastic action of the second spring 32, the lower end of the connecting bar 24 will always abut against the cam 38. In this way, as the cam 38 rotates, the connecting bar 24 can move up and down back and forth, and then the connecting rod 30 can be used to make the two first piston blocks 31 move up and down back and forth. The bottom spaces of both piston cylinders 29 are connected to one-way pipes 23, and the other ends of both one-way pipes 23 extend to the bottom of the fixed plate 15. The inner bottom spaces of both piston cylinders 29 are connected to connecting channels 40. The other ends of the two connecting channels 40 are respectively connected to a first one-way channel 41 and a second one-way channel 42. An electric heating ring 9 is installed inside the second one-way channel 42. The other end of the first one-way channel 41 is connected to the space above the fixed plate 15, and the other end of the second one-way channel 42 is connected to the space below the fixed plate 15. A one-way valve for fluid to flow unidirectionally from bottom to top is installed inside the first one-way channel 41, and a one-way valve for fluid to flow unidirectionally from top to bottom is installed inside the second one-way channel 42. A normally open solenoid valve is installed inside the first one-way channel 41, and a second normally closed solenoid valve is installed inside the second one-way channel 42. In this method, with both the normally open and normally closed solenoid valves de-energized, the first one-way channel 41 is open, and the second one-way channel 42 is sealed. In this state, as the first piston block 31 reciprocates up and down, the fluid direction is from the top space of the connecting cylinder 11, the bottom space of the piston cylinder 29, the connecting channel 40, and the first one-way channel 41 to the outside. This method is used to extract the top space of the connecting cylinder 11, thereby reducing the oxygen content in the detection environment, reducing the possibility of combustion, and further reducing the possibility of explosion. With both the normally open and normally closed solenoid valves energized, the first one-way channel 41 is sealed, and the second one-way channel 42... With the unidirectional channel 42 open, as the first piston block 31 moves up and down repeatedly, the resulting fluid flows through the top space of the connecting cylinder 11, the bottom space of the piston cylinder 29, the connecting channel 40, and the second unidirectional channel 42 into the interior of the connecting cylinder 11. In this state, the insulating oil flows, simulating insulation testing under the condition of the insulating oil in flow, which is more in line with actual testing requirements. After a period of time, the electric heating ring 9 is activated, and the flowing insulating oil is in a state of rising temperature. In this state, insulation testing under the high temperature condition of the insulating oil can be simulated, further approaching the actual use state of the insulating oil, making the testing effect more realistic.

[0023] In one embodiment of the present invention, a piston plate 17 that can slide up and down is provided inside the connecting cylinder 11. A communication port 20 is provided on the piston plate 17, and a manual valve is installed on the communication port 20 to facilitate the subsequent discharge of oil. The inner bottom of the connecting cylinder 11 is elastically connected to the piston plate 17 by a first spring 18. The inner bottom of the connecting cylinder 11 is connected to the outside through a round opening 21. A first normally closed solenoid valve is installed inside the round opening 21. A gas pressure sensor 28 is installed on the side wall of the top space of the connecting cylinder 11. A display control panel 2 is installed on the front side of the integrated welded frame 1. The display control panel 2 is electrically connected to the gas pressure sensor 28 and the first normally closed solenoid valve. Furthermore, the first normally closed solenoid valve can also be manually controlled to open and close by the display control panel 2. In the initial detection state, such as Figure 5 As shown, the oil is located above the piston plate 17 and its height is not higher than the abutting column 19. At this time, the first normally closed solenoid valve is de-energized and sealed, and the round port 21 is sealed. After the drive motor 37 starts, the space at the top of the connecting cylinder 11 is continuously drawn away, causing the gas pressure at the top of the connecting cylinder 11 to continuously decrease. When the gas pressure is less than the threshold set by the gas pressure sensor 28, the display control panel 2 will control the first normally closed solenoid valve to be energized for a period of time. During this period, because the first normally closed solenoid valve is energized and conducts, and the round port 21 is open, the piston plate 17 moves up under the action of negative pressure, and finally the abutting column 19 abuts against the non-locking push switch 27, and the one-way tube 23 is inserted into the oil to facilitate the subsequent circulation of the oil.

[0024] In one embodiment of the present invention, the inner top of the sealing column 25 is provided with an installation groove 26, and the upper end of the piston plate 17 is fixedly connected with an abutment column 19. A non-locking push switch 27 is installed in the inner top of the installation groove 26. The non-locking push switch 27 is electrically connected to the normally open solenoid valve and the second normally closed solenoid valve. When the non-locking push switch 27 is triggered, it will energize both the normally open solenoid valve and the second normally closed solenoid valve.

[0025] In one embodiment of the present invention, a protective box 12 is fixedly connected to the upper end of the top plate 4. A columnar groove 33 is provided on the right side of the protective box 12. A second piston block 34 that can slide left and right is provided in the columnar groove 33. The left side of the second piston block 34 is elastically connected to the left side wall of the columnar groove 33 through a third spring 35. A pressure relief pipe 13 is connected to the left side space of the columnar groove 33. A pressure relief valve 14 is installed inside the pressure relief pipe 13. A check valve is also installed at the pressure relief pipe 13 to ensure that the oil can only be discharged in one direction through the pressure relief pipe 13. The other end of the pressure relief pipe 13 passes through a sealing column 25. If an oil explosion still occurs, the valve will be sealed. In the case of rapid expansion, the liquid pressure will exceed the threshold of the pressure relief valve 14. It will be injected into the space on the left side of the columnar groove 33 through the pressure relief valve 14 and the pressure relief pipe 13. The oil can be buffered and stored by the buffer of the third spring 35. Similarly, the piston plate 17 will also move down and compress the first spring 18, buffering and storing some oil at the same time. Combined with the integrated welded frame 1 and the top plate 4 of the device itself, the overall safety is effectively improved. In addition, it should be noted that the rear side of the protective box 12 is also provided with an oil drain port with a manual valve (not shown) for easy release later.

[0026] In this invention, the insulating oil to be tested is placed into the connecting cylinder 11. At this time, the oil is above the piston plate 17 and its height is not higher than the abutting column 19. The first normally closed solenoid valve is de-energized and in a sealed state, and the round opening 21 is sealed. The sealing door 3 is opened, and the hydraulic telescopic rod 6 is activated to retract to its maximum extent. The connecting cylinder 11 moves down to the lowest position with the lifting plate 7, and the operator performs the oil placement operation. The hydraulic telescopic rod 6 is then activated to extend to its maximum extent, and the connecting cylinder 11 moves up to a suitable position, such as... Figure 2 As shown; When the drive motor 37 is started, its output shaft drives the cam 38 to rotate. Under the elastic action of the second spring 32, the connecting bar 24 moves back and forth up and down with the rotation of the cam 38, causing the two first piston blocks 31 to move back and forth up and down inside the piston cylinder 29 via the connecting rod 30. With both the normally open and normally closed solenoid valves de-energized, the fluid direction is from the top space of the connecting cylinder 11, the bottom space of the piston cylinder 29, the connecting channel 40, and the first one-way channel 41 to the outside, thus drawing away the top space of the connecting cylinder 11, reducing the oxygen content in the detection environment, and reducing the possibility of combustion and explosion. During the evacuation process, the gas pressure in the top space of the connecting cylinder 11 continuously decreases. When the gas pressure is lower than the threshold set by the gas pressure sensor 28, the display control panel 2 controls the first normally closed solenoid valve to be energized for a period of time, and the circular port 21 is opened. Under the action of negative pressure, the piston plate 17 moves upward and finally causes the abutment column 19 to press against the non-locking push switch 27, and the one-way tube 23 is inserted into the oil to facilitate the subsequent oil circulation. After the non-locking push switch 27 is triggered, the normally open solenoid valve and the second normally closed solenoid valve... All solenoid valves are energized, the first one-way channel 41 is sealed, and the second one-way channel 42 is open. With both the normally open and normally closed solenoid valves energized, as the first piston block 31 moves up and down reciprocally, the fluid direction is from the top space of the connecting cylinder 11, the bottom space of the piston cylinder 29, the connecting channel 40, and the second one-way channel 42 to the inside of the connecting cylinder 11. At this time, by activating the pressure electrode 22, the insulation detection operation of the insulating oil can be performed, realizing the circulation of the insulating oil and simulating the insulation detection under the state of insulating oil flow. After a period of time, the electric heating ring 9 is activated to heat the flowing insulating oil, simulating the insulation test under the high temperature flow state of the insulating oil, which is more in line with the usage environment; If an oil explosion and rapid expansion eventually occur, and the liquid pressure exceeds the threshold of the pressure relief valve 14, the oil will be injected into the space on the left side of the columnar groove 33 through the pressure relief pipe 13. The third spring 35 will buffer and store some of the oil. At the same time, the piston plate 17 will move down, compressing the first spring 18 to buffer and store some of the oil. Together with the integrated welded frame 1 and the top plate 4, the overall safety will be improved.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An apparatus for high-voltage insulation testing, characterized in that, include: The test housing is composed of an integral welded frame (1) at the bottom and a top plate (4) at the top. The integral welded frame (1) and the top plate (4) are connected by welding. The lifting storage mechanism includes a horizontal plate (5) fixedly connected between the inner walls of the bottom two sides of the integrated welded frame (1). A hydraulic telescopic rod (6) is installed at the lower end of the horizontal plate (5). A lifting plate (7) is fixedly connected to the telescopic end of the hydraulic telescopic rod (6). A connecting cylinder (11) for storing insulating oil is fixedly connected to the upper end of the lifting plate (7). A detection mechanism that cooperates with the connecting cylinder (11) is installed at the lower end of the top plate (4).

2. The apparatus for high-voltage insulation testing according to claim 1, characterized in that, The upper end of the lifting plate (7) is fixedly connected to multiple guide rods (8), the upper ends of the multiple guide rods (8) all penetrate the top plate (4) and are slidably connected to the top plate (4), and a sealing door (3) is installed on the front side of the bottom part of the integrated welded frame (1).

3. The apparatus for high-voltage insulation testing according to claim 1, characterized in that, The detection mechanism includes multiple connecting frames (16) fixedly connected to the lower end of the top plate (4). The lower ends of the multiple connecting frames (16) are fixedly connected to a fixing plate (15). The lower end of the fixing plate (15) is fixedly connected to a sealing column (25). The outer side of the sealing column (25) is provided with an annular rubber sealing gasket, which cooperates with the inner side of the connecting cylinder (11). Two pressure electrodes (22) are symmetrically installed at the lower end of the sealing column (25).

4. The apparatus for high-voltage insulation testing according to claim 1, characterized in that, It also includes a gas-liquid flow mechanism, which includes two piston cylinders (29) symmetrically fixedly connected to the upper end of the fixed plate (15). Each of the two piston cylinders (29) is provided with a first piston block (31) that can slide up and down. The lower end of each first piston block (31) is elastically connected to the inner bottom of the piston cylinder (29) through a second spring (32). The upper ends of the two first piston blocks (31) are fixedly connected with connecting rods (30), and the upper ends of the two connecting rods (30) are fixedly connected with connecting strips (24).

5. The apparatus for high-voltage insulation testing according to claim 4, characterized in that, Two vertical mounting plates (36) are symmetrically fixedly connected to the upper end of the fixed plate (15). A drive motor (37) is installed on the front side of the vertical mounting plate (36) located on the front side. The output shaft of the drive motor (37) passes through the front vertical mounting plate (36) and is fixedly connected to a cam (38). The output shaft of the drive motor (37) is fixedly connected to a rotating shaft (39). The rear end of the rotating shaft (39) is rotatably connected to the rear vertical mounting plate (36).

6. The apparatus for high-voltage insulation testing according to claim 5, characterized in that, The bottom spaces of both piston cylinders (29) are connected to one-way pipes (23), and the other ends of both one-way pipes (23) extend to the bottom of the fixed plate (15). The inner bottom spaces of both piston cylinders (29) are connected to connecting channels (40). The other ends of the two connecting channels (40) are respectively connected to a first one-way channel (41) and a second one-way channel (42). An electric heating ring (9) is installed inside the second one-way channel (42). The other end of the first one-way channel (41) is connected to the space above the fixed plate (15), and the other end of the second one-way channel (42) is connected to the space below the fixed plate (15). A one-way valve for fluid to flow unidirectionally from bottom to top is installed inside the first one-way channel (41), and a one-way valve for fluid to flow unidirectionally from top to bottom is installed inside the second one-way channel (42).

7. The apparatus for high-voltage insulation testing according to claim 6, characterized in that, The connecting cylinder (11) is provided with a piston plate (17) that can slide up and down. The piston plate (17) has a communication port (20) and a manual valve is installed on the communication port (20). The inner bottom of the connecting cylinder (11) is elastically connected to the piston plate (17) by a first spring (18). The inner bottom of the connecting cylinder (11) is connected to the outside through a round opening (21). A first normally closed solenoid valve is installed inside the round opening (21). A gas pressure sensor (28) is installed on the side wall of the top space of the connecting cylinder (11). A display control panel (2) is installed on the front side of the integrated welding frame (1). The display control panel (2) is electrically connected to the gas pressure sensor (28) and the first normally closed solenoid valve.

8. The apparatus for high-voltage insulation testing according to claim 7, characterized in that, The first one-way channel (41) is equipped with a normally open solenoid valve, and the second one-way channel (42) is equipped with a second normally closed solenoid valve.

9. The apparatus for high-voltage insulation testing according to claim 8, characterized in that, The sealing column (25) has an installation groove (26) on its inner top. The piston plate (17) is fixedly connected to an abutment column (19). The installation groove (26) has a non-locking push switch (27) installed on its inner top. The non-locking push switch (27) is electrically connected to the normally open solenoid valve and the second normally closed solenoid valve.

10. The apparatus for high-voltage insulation testing according to claim 9, characterized in that, A protective box (12) is fixedly connected to the upper end of the top plate (4). A columnar groove (33) is provided on the right side of the protective box (12). A second piston block (34) that can slide left and right is provided in the columnar groove (33). The left side of the second piston block (34) is elastically connected to the left side wall of the columnar groove (33) through a third spring (35). A pressure relief pipe (13) is connected to the left side space of the columnar groove (33). A pressure relief valve (14) is installed inside the pressure relief pipe (13). The other end of the pressure relief pipe (13) passes through a sealing column (25).

Images