Test tank for testing electric insulation performance of enameled wire in low-voltage environment

Abstract

The invention discloses a test tank for testing the electrical insulation performance of an enameled wire in a low-voltage environment, and the test tank comprises a tank body which is provided with a bottom and is not provided with a cover, and the periphery of an opening of the tank body forms a bearing edge part for connection; the outline of the outer cover corresponds to the outline of the opening part of the tank body, and the outer cover is detachably connected with the bearing edge part of the tank body through a fastener, so that the stable assembly of the tank body and the outer cover is realized; according to the invention, through the arrangement of the sealing pieces and the communicating pieces, the bearing edge parts of the tank body and the outer cover are matched with the sealing pieces to form an exclusive high-air-tightness structure, so that a low-pressure environment can be directly supported without modifying an existing device, and the sealing pieces are arranged on the surface of the bottom of one side, facing the tank body, of the outer cover; the problem of pressure fluctuation caused by poor airtightness of an existing device is avoided, meanwhile, the two communicating pieces are in butt joint with the vacuumizing assembly and the air pressure monitoring assembly respectively, a complete closed loop of vacuumizing, pressure maintaining and monitoring is constructed, and target low pressure can be stably maintained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test tank for testing the electrical insulation performance of enameled wire in low-pressure environment, in particular to a test tank for testing the electrical insulation performance of enameled wire in low-pressure environment. BACKGROUND

[0002] The low-altitude economy can extend to the airspace not more than 3000 meters according to the characteristics and actual needs of different regions, such as long-range flight. Except for cities such as Lhasa and Xining with super high altitude, the altitudes of most cities in the east and central regions are usually below 1000 meters. Therefore, considering the use below 4000 meters, it can meet most use scenarios. However, the higher the altitude, the lower the atmospheric pressure. At an altitude of 4000 meters, the atmospheric pressure drops to about 61.6kPa, which is about 61% of the normal atmospheric pressure. Insulating materials are more likely to discharge in low-pressure environments and are more likely to experience electrical aging and electrical breakdown. In order to ensure the safety of the use of motors and electromagnetic valves in low-altitude environments, it is necessary to test the electrical insulation performance of enameled wire in low-pressure environments.

[0003] The existing electrical performance testing device cannot realize low-pressure environment testing. If the existing electrical performance testing device is modified, since the existing electrical insulation testing device is usually simple in airtight structure for the convenience of installing the sample wire, it is very difficult to maintain a constant pressure low-pressure environment. In order to perform low-pressure testing, the entire testing device must be modified for air tightness, and all insulation structures in the existing device must be strengthened, which is difficult. SUMMARY

[0004] The present application relates to the technical field of test tank for testing the electrical insulation performance of enameled wire in low-pressure environment, in particular to a test tank for testing the electrical insulation performance of enameled wire in low-pressure environment.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A test container for testing the electrical insulation performance of enameled wire in a low-voltage environment includes a container body with a bottom but no lid, the periphery of which forms a load-bearing edge for connection; an outer lid, the outer lid being correspondingly positioned to the outline of the opening of the container body, the outer lid being detachably connected to the load-bearing edge of the container body by fasteners, achieving a secure assembly of the container body and the outer lid; and a sealing element, the sealing element being disposed on the bottom surface of the outer lid facing the container body, when the outer lid and the container body are locked together by fasteners, the sealing element is pressed between the mating surfaces of the two, achieving a connection. The high airtightness seal ensures the stable maintenance of the low-pressure environment inside the tank; the test assembly, located at the bottom of the outer cover, is used to test the performance of the enameled wire under the low-pressure environment inside the tank; the connecting parts, which consist of two sets, are respectively sealed and inserted into the top of both sides of the outer cover. The conveying end of one set of the connecting parts is connected to a vacuum assembly for constructing the target low-pressure environment inside the tank, and the output end of the other set of the connecting parts is connected to a monitoring assembly for real-time monitoring and feedback of the gas pressure parameters inside the tank.

[0006] As a preferred technical solution, the fastener includes through holes opened on the bearing edge of the tank body and the top of the outer cover. Two sets of through holes in the same vertical position are each provided with a fastening bolt. The screw of each set of fastening bolts extends downward to the lower part of the bearing edge of the tank body and is threadedly connected to a fastening nut. Tightening the fastening nut causes its top to abut against the lower surface of the bearing edge of the tank body, while the screw head of the fastening bolt is pressed against the surface of the outer cover. The sealing element includes a sealing ring adhered to the bottom of the outer cover, and the top of the can body has a groove around the can opening that is adapted to the sealing ring.

[0007] As a preferred technical solution, the test assembly includes insulating tubes that are respectively sealed and inserted into the top of the left and right sides of the outer cover. Each set of insulating tubes has a terminal block sealed inside. The terminals of the two sets of terminals extend upward to the top of the outer cover and are respectively connected to the input and output terminals of the test equipment to form a test circuit. The crimping ends of the two sets of terminals extend downward to the bottom of the outer cover. Each crimping end of the two sets of terminals is connected to a multi-position connector. A stress application assembly for applying stress to the enameled wire under test is provided at the bottom of the outer cover and between the two sets of terminals. The multi-position connector includes conductive bases that are respectively crimped onto the crimp ends of two sets of terminals. The conductive bases are T-shaped, with both ends of the two sets of conductive bases extending forward and backward respectively. The bottom of each set of conductive bases is connected to multiple sets of connecting tubes for connecting enameled wires via detachable components. Each set of connecting tubes has a crimping component inside for crimping the enameled wire inserted inside to improve the connection strength with the connecting tube. The multi-position connector connects multiple enameled wires simultaneously through multiple sets of connecting tubes. With the help of a stress application component, it enables synchronous performance testing of multiple sets of enameled wires under the same low-voltage environment. At the same time, it enables comparative testing of different parameters through group connection, improving test efficiency and data reliability.

[0008] As a preferred technical solution, the stress application component includes an electric push rod fixedly installed at the bottom of the outer cover. The telescopic end of the electric push rod is connected to a limiting plate through a connector. The two ends of the limiting plate are arranged front and rear. The bottom of the limiting plate has multiple sets of linear and equidistantly arranged grooves. The bottom of the limiting plate is provided with an anti-detachment component for sealing the groove openings to prevent the enameled wire from coming out of its inner cavity. The multiple sets of grooves are arranged in a one-to-one correspondence with the multiple sets of connecting pipes of the multiple connecting components. The two ends of each enameled wire are respectively connected to the connecting pipes on the conductive seats on both sides, and the middle is embedded in the corresponding groove. The grooves form a vertical limit on the enameled wire to prevent the enameled wire from shifting or leaving the test position when stress is applied. The connector includes limiting rings fixedly installed at the top of both ends of the limiting plate. The inner cavities of the two sets of limiting rings are respectively slidably connected to sliders. A connecting strip is fixedly connected between the two sets of sliders. The top of the connecting strip is fixedly connected to the telescopic end of the electric push rod.

[0009] As a preferred technical solution, the anti-detachment component includes an installation groove formed at the bottom of the limiting plate and arranged along its length. An adapter rod is rotatably connected to one side of the installation groove. A limiting strip is fixedly sleeved on the surface of the adapter rod. A limiting bolt is passed through the bottom of the other end of the limiting strip. The screw of the limiting bolt can pass through the limiting strip and is threadedly connected to the inner wall of the top of the other side of the installation groove.

[0010] As a preferred technical solution, the crimping component includes crimping blocks respectively disposed in the inner cavity of each set of connecting pipes. One side of each set of connecting pipes is connected to an internally threaded pipe. The inner cavity of each set of internally threaded pipes is threaded with a push bolt. The end of each set of push bolts is fixedly connected to a linkage rod. The back of each set of crimping blocks is provided with an adapter groove corresponding to the linkage rod. Each set of linkage rods is rotatably connected to the inner cavity of the corresponding side adapter groove. Rotating the push bolt can push the crimping block to the other side to crimp the enameled wire.

[0011] As a preferred technical solution, the detachable component includes a threaded post fixedly installed on the top of the conduit. Each set of conductive seats has a threaded groove at the bottom and at the corresponding position of each set of threaded posts for threaded connection of the threaded post. Each set of threaded posts is threadedly connected to the inner cavity of the corresponding side threaded groove.

[0012] As a preferred technical solution, each set of conductive bases has an insulating rectangular tube on its outer surface. The bottom of the front and rear sides of each set of insulating rectangular tubes are respectively rotatably connected to fixing bolts. The screw of each set of fixing bolts passes through the corresponding side insulating rectangular tube upwards and is threaded to the bottom surface of the outer cover.

[0013] As a preferred technical solution, the connecting component includes connecting pipes respectively disposed on the top of both sides of the outer cover, with the opposite ends of the two sets of connecting pipes sealingly penetrating the outer cover downwards, and the opposite ends of the two sets of connecting pipes respectively connected to valves. The vacuum assembly includes a gas source connector pipe connected to the end of one of the valves, and the other end of the gas source connector pipe is connected to the vacuum equipment. The air pressure parameter monitoring component includes a three-way pipe connected to the ends of another set of valves. One branch of the three-way pipe is connected to a first pressure sensor, and the other branch of the three-way pipe is connected to an air pressure gauge.

[0014] As a preferred technical solution, an operation panel and a controller are installed on the lower side of the tank. The signal output terminal of the operation panel is electrically connected to the signal input terminal of the controller through a wire, and the signal output terminal of the first pressure sensor is electrically connected to the signal input terminal of the controller through a wire. A second pressure sensor is fixedly connected to the bottom of the connecting strip. The detection end of the second pressure sensor abuts against the top of the limiting plate. The signal output end of the second pressure sensor is connected to the signal input end of the controller through a remote transmission module. The signal input end of the electric push rod is electrically connected to the signal output end of the controller.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention, through the design of sealing and connecting components, forms a unique high-airtightness structure by cooperating with the bearing edges of the tank body and the outer cover to form a sealing component. It can directly support low-pressure environments without modifying existing devices, avoiding the pressure fluctuation problem caused by the poor airtightness of existing devices. At the same time, the two sets of connecting components are respectively connected to the vacuuming component and the pressure monitoring component to construct a complete closed loop of vacuuming, pressure holding, and monitoring, which can stably maintain the target low pressure and solve the pain point that existing devices still cannot maintain constant pressure after modification.

[0016] This invention, through the setup of the test components, the wrapping of the terminals with insulating tubes, and the setting of the rectangular tubes for isolation, forms a double insulation barrier, effectively blocking the electrical connection between the conductive base and the outer cover / can body. This prevents high-voltage test signals from being conducted through metal parts, ensuring operator safety and the accuracy of test data. Furthermore, the T-shaped conductive base of the multi-position connector, in conjunction with multiple sets of connecting tubes, can simultaneously connect multiple enameled wires, enabling synchronous performance testing under the same low-voltage environment. Additionally, by grouping samples with different parameters, comparative tests can be directly conducted without the need for multiple test environment setups, significantly improving test efficiency and data comparability. Simultaneously, the positional adaptation of the stress application component and the multi-position connector allows mechanical stress to be precisely applied to each test sample, achieving coupled testing of low-voltage environment, mechanical stress, and electrical performance, filling the functional gap of traditional single-environment or single-stress testing.

[0017] This invention utilizes a stress application component. An electric push rod transmits traction force through a connector, and a slider slides vertically along the inner cavity of a limiting ring. This effectively constrains the direction of the traction force, ensuring that stress is applied axially along the enameled wire. This avoids sample bending or uneven stress distribution caused by non-axial forces, improving the accuracy of stress loading. Simultaneously, multiple grooves on the limiting plate correspond one-to-one with the wiring conduits of multiple connectors, working in conjunction with anti-detachment components to vertically limit the middle of the enameled wire. This prevents sample displacement or detachment from the test position during stress loading, ensuring consistent stress on each sample and providing structural assurance for the consistency of simultaneous testing of multiple samples. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the test tank for testing the electrical insulation performance of enameled wires in a low-voltage environment according to the present invention. Figure 2 This is a structural schematic diagram from another perspective of the present invention; Figure 3 This is a schematic diagram of the tank body of the present invention; Figure 4 This is a schematic diagram of the structure of the outer cover of the present invention; Figure 5 This is a bottom view of the outer cover of the present invention. Figure 6 This is a schematic diagram of the conductive base of the present invention; Figure 7 This is a cross-sectional view of the threaded column of the present invention; Figure 8 This is a schematic diagram of the connecting strip of the present invention.

[0019] In the picture: 100. Tank body; 101. Outer cover; 102. Fastening bolts; 103. Fastening nuts; 104. Control panel; 105. Controller; 106. Slot; 107. Through hole; 108. Sealing ring; 200. Connecting pipe; 201. Valve; 202. Gas source connector; 203. T-connector; 204. First pressure sensor; 205. Pressure gauge; 300. Terminal block; 301. Insulating tube; 302. Conductive base; 303. Threaded groove; 304. Threaded post; 305. Connecting tube; 306. Hexagonal ring; 308. Wire clamp; 309. Adapter groove; 310. Push bolt; 311. Linkage rod; 312. Internal threaded tube; 400. Isolation rectangular tube; 401. Fixing bolt; 500. Voltage adapter; 501. Electric push rod; 502. Limiting plate; 503. Connecting strip; 504. Limiting ring; 505. Second pressure sensor; 506. Slider; 507. Groove; 508. Mounting slot; 509. Adapter rod; 510. Limiting strip; 511. Limiting bolt. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-8This embodiment provides a test tank for testing the electrical insulation performance of enameled wire in a low-pressure environment. The tank includes a tank body 100, which is bottomless and has a load-bearing edge formed around its opening for connection; an outer cover 101, which corresponds to the outline of the opening of the tank body 100 and is detachably connected to the load-bearing edge of the tank body 100 via fasteners, achieving a secure assembly between the tank body 100 and the outer cover 101; a sealing element, located on the bottom surface of the outer cover 101 facing the tank body 100, which is pressed between the contact surfaces of the outer cover 101 and the tank body 100 when locked together by fasteners, achieving a high airtight seal at the connection point and ensuring the stable maintenance of the low-pressure environment inside the tank; and a test assembly, located at the bottom of the outer cover 101, used to test the enameled wire under low-pressure conditions inside the tank. The performance of the device is tested and verified. The device has two sets of connecting parts, which are respectively sealed and inserted into the top of the two sides of the outer cover 101. The conveying end of one set of connecting parts is connected to a vacuuming component for constructing the target low-pressure environment inside the tank, and the output end of the other set of connecting parts is connected to a monitoring component for real-time monitoring and feedback of the air pressure parameters inside the tank 100. Through the setting of the sealing parts and connecting parts, the bearing edge of the tank 100 and the outer cover 101 cooperate with the sealing parts to form a dedicated high airtight structure. It can directly support the low-pressure environment without modifying the existing device, avoiding the pressure fluctuation problem caused by the poor airtightness of the existing device. At the same time, the two sets of connecting parts are respectively connected to the vacuuming component and the air pressure monitoring component to construct a complete closed loop of vacuuming, pressure holding and monitoring, which can stably maintain the target low pressure and solve the pain point that it is still difficult to maintain constant pressure after the existing device is modified.

[0022] The fasteners include through holes 107 formed on the bearing edge of the tank 100 and the top of the outer cover 101. Two sets of through holes 107 in the same vertical position are each provided with fastening bolts 102. The screw of each set of fastening bolts 102 extends downward to the lower part of the bearing edge of the tank 100 and is threadedly connected to a fastening nut 103. Tighten the fastening nut 103 so that its top abuts against the lower surface of the bearing edge of the tank 100, and at the same time press the screw head of the fastening bolt 102 against the surface of the outer cover 101. The sealing component includes a sealing ring 108 bonded to the bottom of the outer cover 101, and a groove 106 adapted to the sealing ring 108 is provided on the top of the tank body 100 and around the tank opening. Through the setting of fasteners, the reverse clamping force of the nut and the screw head makes the outer cover 101 and the bearing edge of the tank body 100 fit tightly together, with high connection strength and convenient disassembly and assembly, which is suitable for the need for frequent opening and sample changing during the test. Moreover, the sealing component adopts the fitting design of sealing ring 108 and groove 106, which significantly improves the sealing area and sealing performance of the contact surface compared with simple planar sealing, effectively preventing the gas exchange between the low-pressure environment inside the tank and the outside atmosphere, avoiding the impact of air pressure fluctuations on test accuracy, and providing key support for the long-term stable maintenance of the low-pressure environment.

[0023] The test assembly includes insulating tubes 301 that are respectively sealed and inserted into the top of the left and right sides of the outer cover 101. Each set of insulating tubes 301 has a terminal block 300 sealed inside. The terminals of the two sets of terminals 300 extend upward to the top of the outer cover 101 and are respectively connected to the input and output terminals of the test equipment to form a test circuit. The wire-pressing ends of the two sets of terminals 300 extend downward to the bottom of the outer cover 101. Each set of terminals 300 has multiple connectors connected to its wire-pressing ends. A stress-applying assembly for applying stress to the enameled wire under test is provided at the bottom of the outer cover 101 and between the two sets of terminals 300. The multi-position connector includes conductive seats 302 that are respectively crimped onto the crimping ends of two sets of terminals 300. The conductive seats 302 are T-shaped, with both ends of the two sets of conductive seats 302 extending forward and backward respectively. The bottom of each set of conductive seats 302 is connected to multiple sets of connecting tubes 305 for connecting enameled wires via detachable components. Each set of connecting tubes 305 has a crimping component inside for crimping the enameled wire inserted inside to improve the connection firmness with the connecting tube 305. The multi-position connector connects multiple enameled wires simultaneously through multiple sets of connecting tubes 305. With the help of the stress application component, it enables synchronous performance testing of multiple sets of enameled wires under the same low-voltage environment. At the same time, it enables comparative testing of different parameters through group connection, improving test efficiency and data reliability. Through the setting of the test component, the insulating tube 301 wraps around and insulates the terminals 300. The rectangular tube 400 forms a double insulation barrier, effectively blocking the electrical connection between the conductive base 302 and the outer cover 101 and the tank 100, preventing high-voltage test signals from being conducted through metal parts, ensuring operator safety and the accuracy of test data. Furthermore, the T-shaped conductive base 302 with multiple connectors, in conjunction with multiple sets of wiring tubes 305, can simultaneously connect multiple enameled wires, enabling synchronous performance testing under the same low-voltage environment. Samples with different parameters can also be connected by grouping, allowing for direct comparative testing without the need for multiple test environment setups, significantly improving test efficiency and data comparability. At the same time, the positional adaptation of the stress application component and the multiple connectors ensures that mechanical stress can be precisely applied to each test sample, achieving coupled testing of low-voltage environment, mechanical stress, and electrical performance, filling the functional gap of traditional single-environment or single-stress testing.

[0024] The stress application component includes an electric push rod 501 fixedly installed at the bottom of the outer cover 101. The telescopic end of the electric push rod 501 is connected to a limiting plate 502 through a connector. The two ends of the limiting plate 502 are arranged front and rear. The bottom of the limiting plate 502 has multiple sets of linear and equidistantly arranged grooves 507. The bottom of the limiting plate 502 is provided with an anti-detachment component for sealing the opening of the groove 507 to prevent the enameled wire from coming out of its inner cavity. The multiple sets of grooves 507 are arranged in a one-to-one correspondence with the multiple sets of wiring tubes 305 of the multiple connecting components. The two ends of each enameled wire are respectively connected to the wiring tubes 305 on the two conductive seats 302 on both sides, and the middle is embedded in the corresponding groove 507. The grooves 507 form a vertical limit on the enameled wire to prevent the enameled wire from shifting or leaving the test position when stress is applied. The connector includes limiting rings 504 fixedly installed at the top of both ends of the limiting plate 502. Slider 506s are slidably connected to the inner cavities of the two sets of limiting rings 504, and a connecting strip 503 is fixedly connected between the two sets of sliders 506. The top of the connecting strip 503 is fixedly connected to the telescopic end of the electric push rod 501. Through the stress application component, the electric push rod 501 transmits traction force through the connector. The slider 506 slides vertically along the inner cavity of the limiting ring 504, effectively constraining the direction of the traction force and ensuring that the stress is applied axially along the enameled wire. This avoids sample bending or uneven stress distribution caused by non-axial forces, improving the accuracy of stress loading. Simultaneously, multiple grooves 507 of the limiting plate 502 correspond one-to-one with the wiring tubes 305 of the multiple connectors, working with anti-detachment components to achieve vertical limiting in the middle of the enameled wire, preventing sample displacement or detachment from the test position during stress loading. This ensures consistent stress state for each sample, providing structural assurance for the consistency of simultaneous testing of multiple samples.

[0025] The anti-detachment component includes an installation groove 508 formed at the bottom of the limiting plate 502 and extending along its length. A connecting rod 509 is rotatably connected to one side of the groove 508. A limiting strip 510 is fixedly sleeved on the surface of the connecting rod 509. A limiting bolt 511 passes through the bottom of the other end of the limiting strip 510. The screw of the limiting bolt 511 can pass through the limiting strip 510 and is threaded to the inner wall of the top of the other side of the installation groove 508. With the anti-detachment component, rotating the limiting strip 510 can cover the opening of the groove 507. The bolt locks the fastened part, making the operation simple and efficient. It is suitable for the frequent sample assembly and disassembly requirements in the test. The synergistic effect of the limiting strip 510 and the groove 507 forms a dual constraint of lateral closure and vertical limitation on the enameled wire. Even under a large traction force, it can effectively prevent the enameled wire from coming out of the groove 507, avoid test interruption or data distortion caused by sample displacement, and ensure the stability of the test process.

[0026] The crimping component includes crimping blocks 308 respectively disposed within the inner cavity of each set of connecting pipes 305. Each set of connecting pipes 305 has an internally threaded pipe 312 connected to one side. Each set of internally threaded pipes 312 has a threaded push-in bolt 310 threadedly connected to its inner cavity. Each push-in bolt 310 has a fixed connecting rod 311 at its end. Each set of crimping blocks 308 has a corresponding adapter groove 309 on its back. Each set of connecting rods 311 is rotatably connected to the inner cavity of the corresponding adapter groove 309. Rotating the push-in bolt 310 can push the crimping block 308 towards the other side. The wire is crimped by pushing from one side. With the crimping component, rotating the push bolt 310 can push the crimping block 308 to move along the inner cavity of the connector 305. The crimping block 308 clamps the wire through the cooperation between itself and the inner wall of the connector 305. No special crimping tool is required, making the operation convenient. At the same time, the adjustable design of the crimping block 308 can adapt to enameled wires of different diameters, ensuring a tight crimp without damaging the insulation layer of the sample. Furthermore, the tight crimping effect can ensure the continuity of conductivity during electrical performance testing, avoid test signal fluctuations caused by poor contact, and improve the reliability of the data.

[0027] The detachable component includes a threaded post 304 fixedly installed on the top of the connector 305. Each set of conductive bases 302 has a threaded groove 303 at the bottom and corresponding position of each set of threaded posts 304 for threaded connection of the threaded post 304. Each set of threaded posts 304 is threaded to the inner cavity of the corresponding side threaded groove 303. Each set of connectors 305 has a hexagonal ring 306 connected to the bottom. Through the setting of the detachable component, the threaded post 304 and the threaded groove 303 of the conductive base 302 can be detachably connected. Different specifications of connectors 305 can be quickly replaced according to testing requirements, and it can be adapted to enameled wire samples of various wire diameters or types without modifying the overall structure of multiple connectors, which significantly improves the versatility of the equipment.

[0028] Each conductive base 302 has an insulating rectangular tube 400 on its outer surface. Each insulating rectangular tube 400 has a fixing bolt 401 rotatably connected to its front and rear bottom sides. The bolt of each fixing bolt 401 extends upward through the corresponding insulating rectangular tube 400 and is threaded to the bottom surface of the outer cover 101. The insulating rectangular tube 400, positioned on the outer surface of the conductive base 302, effectively blocks the electrical connection between the conductive base 302 and the metal part of the outer cover 101. Combined with the insulating tube 301 providing insulation protection for the terminals 300, a double insulation barrier is formed, avoiding the risk of leakage during high-voltage testing and ensuring test safety and data accuracy. Furthermore, the fixing bolts 401 firmly connect the insulating rectangular tube 400 to the bottom of the outer cover 101, indirectly achieving stable installation of the conductive base 302. This prevents displacement of the conductive base 302 due to vibration of the electric push rod 501 or airflow disturbance during testing, ensuring the stability of the electrical connection and sample fixation.

[0029] The connecting component includes connecting pipes 200 respectively disposed on the top of both sides of the outer cover 101. The opposite ends of the two sets of connecting pipes 200 respectively seal downwards and penetrate the outer cover 101. The opposite ends of the two sets of connecting pipes 200 are respectively connected to valves 201. The vacuum assembly includes a gas source connector 202 pipe connected to the end of one of the valves 201. The other end of the gas source connector 202 pipe is connected to the vacuum equipment. The pressure parameter monitoring component includes a three-way pipe 203 connected to the end of another set of valves 201. One branch of the three-way pipe 203 is connected to a first pressure sensor 204, and the other branch is connected to a pressure gauge 205. Through the cooperation of the connecting parts with the vacuuming component and the pressure parameter monitoring component, and the design of the connecting pipe 200 and the valve 201, the start and stop of vacuuming and depressurization can be flexibly controlled. This facilitates the adjustment of the rate of change of air pressure inside the tank according to the test requirements, avoiding the impact of sudden rises and falls in air pressure on the sample or equipment. The air source connector 202 of the vacuuming component facilitates quick docking with external vacuuming equipment. The three-way pipe 203 of the pressure monitoring component connects to both the first pressure sensor 204 and the pressure gauge 205, realizing dual monitoring and verification of air pressure parameters. This avoids misjudgments caused by the failure of a single monitoring component and provides data support for the precise control of low-pressure environments.

[0030] Among them, valve 201 can be a solenoid valve, which can be purchased on the market, so its model is not limited here.

[0031] The first pressure sensor 204 can be selected as SMC PSE540-01-R-20MPa.

[0032] Among them, an operation panel 104 and a controller 105 are installed on the lower side of the tank body 100. The signal output terminal of the operation panel 104 is electrically connected to the signal input terminal of the controller 105 through a wire. The signal output terminal of the first pressure sensor 204 is electrically connected to the signal input terminal of the controller 105 through a wire. The controller 105 can be a DSP controller 105, specifically the TMS320F2812.

[0033] A second pressure sensor 505 is fixedly connected to the bottom of the connecting strip 503. The detection end of the second pressure sensor 505 abuts against the top of the limiting plate 502. The signal output end of the second pressure sensor 505 is connected to the signal input end of the controller 105 through a remote transmission module. The signal input end of the electric push rod 501 is electrically connected to the signal output end of the controller 105. Through the settings of the operation screen 104 and the controller 105, the operation screen 104 and the controller 105 provide users with a convenient human-machine interface. Commands can be directly issued and test parameters can be displayed in real time without frequent manual intervention, reducing the complexity of operation. The dual pressure sensors collect air pressure and traction force data in real time, realizing the synchronous monitoring of environmental parameters and stress parameters. Furthermore, the second pressure sensor 505 feeds back stress data through the remote transmission module. The controller 105 controls the extension and retraction state of the electric push rod 501 based on the data closed loop to ensure that the traction force is stable within the preset range. The electrical connection between the electric push rod 501 and the controller 105 realizes the automation of stress loading, avoids the error of manual loading, and significantly improves the test accuracy and repeatability.

[0034] The bottom of the outer cover 101 is equipped with a voltage adapter 500. The power cord of the voltage adapter 500 passes through the outer cover 101 through the cooperation of the wire guide, silicone rubber sealing plug and clamping bolt, thereby supplying power to the voltage adapter 500. At the same time, the voltage adapter 500 has two power supply modules, which are used to supply power to the electric push rod 501 and the second pressure sensor 505 respectively. The two power supply modules are GRB2412D-5W-B for powering the electric actuator 501 and LTM8064IY-PBF for powering the second pressure sensor 505.

[0035] The second pressure sensor 505 can be selected as Zemic H3-C3-100N-3B.

[0036] Working principle; First, after removing the outer cover 101, strip the insulation layer from both ends of the enameled wire to be tested and insert them into the wiring tubes 305 at the bottom of the conductive seats 302 on both sides. Then, rotate the push bolts 310 on the side of the wiring tubes 305, and push the wire pressing block 308 to move along the inner cavity of the wiring tubes 305 through the linkage rod 311.

[0037] If multiple sets of samples need to be tested simultaneously or comparative tests are to be carried out, the threaded post 304 and threaded groove 303 at the bottom of the conductive base 302 can be used to replace the wire-diameter connecting tube 305, and multiple enameled wires can be connected to different connecting tubes 305 to form independent test branches. Subsequently, the middle part of the enameled wire is embedded in the groove 507 at the bottom of the limiting plate 502. The adapter rod 509 is rotated so that the limiting strip 510 covers the opening of the groove 507. The limiting bolt 511 is screwed in to lock the anti-dislodgement component. Through the synergistic effect of the groove 507 and the limiting strip 510, the enameled wire is prevented from shifting or coming out when under stress loading. At this point, the outer cover 101 is closed, so that the sealing ring 108 at the bottom of the outer cover 101 is embedded in the slot 106 at the top of the tank body 100. The outer cover 101 and the through hole 107 on the bearing edge of the tank body 100 are aligned, the fastening bolt 102 is inserted and the fastening nut 103 is tightened. Through the reverse clamping force of the nut and the bolt head, the outer cover 101 and the tank body 100 are sealed and locked, providing a high airtightness foundation for the construction of a low-pressure environment. Connect the gas source connector 202 of the vacuum assembly to the vacuum equipment, and connect the terminals of the wiring terminal 300 to the input and output terminals of the test equipment respectively to form a complete electrical performance test circuit. Start the operation panel 104 and controller 105, check the signal connection status of the first pressure sensor 204, the second pressure sensor 505 and the electric push rod 501, and send a "low-pressure environment construction command" to the controller 105 through the operation panel 104. The controller 105 drives the vacuum equipment to start and opens the valve 201 of the corresponding connecting part at the same time. The air in the tank is drawn out through the connecting pipe 200, valve 201 and air source connector 202, so that the air pressure is gradually reduced. The first pressure sensor 204 collects the gas pressure data inside the tank in real time and transmits it to the controller 105 through a wire. When the gas pressure drops to the preset target value, the controller 105 automatically shuts down the vacuuming equipment and the corresponding valve 201 and enters the pressure holding state. The pressure gauge 205 serves as a redundant monitoring component, simultaneously displaying the pressure inside the tank and forming a dual verification with the data from the first pressure sensor 204. The precise loading and feedback of mechanical stress, the setting and execution of stress parameters, are achieved by inputting the target traction force parameters through the operation screen 104. The controller 105 transmits the command to the electric push rod 501. The telescopic end of the electric push rod 501 extends downward, causing the connecting bar 503 to move downward synchronously. The sliders 506 at both ends of the connecting bar 503 slide vertically along the inner cavity of the limiting ring 504, thereby ensuring that the traction force is applied along the axial direction of the enameled wire, which in turn pushes the limiting plate 502 to pull the enameled wire downward. The second pressure sensor 505 at the bottom of the stress closed-loop control connecting bar 503 detects the traction force in real time and feeds the data back to the controller 105 through the remote transmission module. When the traction force reaches the preset value, the controller 105 instructs the electric push rod 501 to stop extending and retracting to maintain stress stability. The remote transmission module can be installed on the outer wall of the tank and connected to the second pressure sensor 505 through a cable with a sealed connector. It adopts a low-power wireless module with an operating frequency of 433MHz, which is compatible with signal penetration through the metal tank wall.

[0038] The groove 507 of the limiting plate 502 forms a vertical limit on the enameled wire, and together with the lateral locking of the anti-detachment component, it ensures that the stress is only applied to the enameled wire along the axial direction, avoiding test errors caused by unexpected stress. The continuity and insulation protection test equipment for the electrical performance coupling test circuit of enameled wire applies a test voltage to the enameled wire through the terminal 300. The current is conducted to the enameled wire through the terminal 300, conductive base 302, and connecting pipe 305 on one side, and then flows back to the test equipment through the connecting pipe 305, conductive base 302, and terminal 300 on the other side, forming a complete test circuit. The insulating rectangular tube 400 on the outer surface of the conductive base 302 blocks the electrical connection between the conductive base 302 and the outer cover 101. Together with the insulating tube 301 wrapping the terminal 300, it prevents high voltage from being conducted through the metal outer cover 101 or the can 100, thus ensuring test safety and data accuracy. The T-shaped conductive base 302 extends to the front and rear sides in a structure that, together with multiple sets of connecting pipes 305, can simultaneously apply the same low-voltage environment and stress conditions to multiple enameled wires to achieve synchronous performance testing. If enameled wires with different parameters, such as different wire diameters and different insulation layer materials, are connected in groups, comparative tests can be carried out directly to intuitively analyze the influence of variables on insulation performance. Finally, a pressure relief command is sent through the operation panel 104, the controller 105 opens the valve 201 of the connecting part, slowly adds air into the tank to atmospheric pressure, loosens the fastening nut 103 to remove the outer cover 101, loosens the limit bolt 511 of the anti-detachment part, and takes out the enameled wire after testing, thus completing the sample replacement or test termination.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test container for testing the electrical insulation performance of enameled wires in a low-voltage environment, characterized in that, include: The tank body (100) is a bottomless structure with a bottom and a capless design, and the periphery of its opening forms a load-bearing edge for connection. The outer cover (101) is provided in a manner corresponding to the opening contour of the tank body (100). The outer cover (101) is detachably connected to the bearing edge of the tank body (100) by fasteners, thereby achieving a stable assembly of the tank body (100) and the outer cover (101). A sealing element is provided on the bottom surface of the outer cover (101) facing the tank body (100). When the outer cover (101) and the tank body (100) are locked together by fasteners, the sealing element is pressed between the two mating surfaces to achieve a high airtight seal at the connection and ensure the stable maintenance of the low-pressure environment inside the tank. The test assembly is located at the bottom of the outer cover (101) and is used to test the performance of the enameled wire under low pressure in the tank. The connecting element has two sets, which are respectively sealed and inserted into the top of both sides of the outer cover (101). The conveying end of one set of the connecting element is connected to a vacuum assembly for constructing a target low-pressure environment inside the tank, and the output end of the other set of the connecting element is connected to a monitoring assembly for real-time monitoring and feedback of the air pressure parameters inside the tank (100).

2. The test container for testing the electrical insulation performance of enameled wire in a low-voltage environment according to claim 1, characterized in that: The fasteners include through holes (107) opened on the bearing edge of the tank (100) and the top of the outer cover (101). Two sets of through holes (107) in the same vertical position are provided with fastening bolts (102). The screw of each set of fastening bolts (102) extends downward to the lower part of the bearing edge of the tank (100) and is threaded with a fastening nut (103). Tighten the fastening nut (103) so that its top abuts against the lower surface of the bearing edge of the tank (100), and at the same time, the screw head of the fastening bolt (102) is pressed against the surface of the outer cover (101). The sealing element includes a sealing ring (108) bonded to the bottom of the outer cover (101), and a groove (106) adapted to the sealing ring (108) is provided on the top of the can body (100) and around the can opening.

3. The test container for testing the electrical insulation performance of enameled wire in a low-voltage environment according to claim 2, characterized in that: The test assembly includes insulating tubes (301) that are respectively sealed and inserted into the top of the left and right sides of the outer cover (101). Both sets of insulating tubes (301) are sealed and inserted with terminals (300). The terminals of the two sets of terminals (300) extend upward to the top of the outer cover (101) and are respectively connected to the input and output terminals of the test equipment to form a test circuit. The wire-pressing ends of the two sets of terminals (300) extend downward to the bottom of the outer cover (101). The wire-pressing ends of the two sets of terminals (300) are connected to multiple connectors. A stress-applying assembly for applying stress to the enameled wire under test is provided at the bottom of the outer cover (101) and between the two sets of terminals (300). The multi-position connector includes conductive bases (302) that are respectively crimped to the crimp ends of two sets of terminals (300). The conductive bases (302) are T-shaped, and the two ends of the two sets of conductive bases (302) extend forward and backward respectively. The bottom of the two sets of conductive bases (302) are respectively connected to multiple sets of connecting tubes (305) for connecting enameled wires through detachable parts. Each set of connecting tubes (305) is provided with a crimping part for crimping the enameled wire inserted into it to improve the connection firmness with the connecting tube (305). The multi-position connector connects multiple enameled wires simultaneously through multiple sets of connecting tubes (305). With the help of the stress application component, the synchronous performance test of multiple sets of enameled wires under the same low-voltage environment can be realized. At the same time, the comparison test of different parameters can be realized through group connection, thereby improving the test efficiency and data reliability.

4. The test container for testing the electrical insulation performance of enameled wire in a low-voltage environment according to claim 3, characterized in that: The stress application assembly includes an electric push rod (501) fixedly installed at the bottom of the outer cover (101). The telescopic end of the electric push rod (501) is connected to a limiting plate (502) through a connector. The two ends of the limiting plate (502) are arranged front and back. The bottom of the limiting plate (502) has multiple sets of linear and equidistant grooves (507). The bottom of the limiting plate (502) is provided with an anti-detachment component for sealing the opening of the groove (507) to prevent the enameled wire from coming out of its inner cavity. The multiple sets of grooves (507) are arranged in a one-to-one correspondence with the multiple sets of connecting pipes (305) of the multiple connecting components. The two ends of each enameled wire are respectively connected to the connecting pipes (305) on the conductive seats (302) on both sides, and the middle is embedded in the corresponding groove (507). The groove (507) forms a vertical limit on the enameled wire to prevent the enameled wire from shifting or leaving the test position when stress is applied. The connector includes limiting rings (504) fixedly installed at the top of both ends of the limiting plate (502). The inner cavities of the two sets of limiting rings (504) are respectively slidably connected to sliders (506). A set of connecting strips (503) is fixedly connected between the two sets of sliders (506). The top of the connecting strip (503) is fixedly connected to the telescopic end of the electric push rod (501).

5. A test container for testing the electrical insulation performance of enameled wires in a low-voltage environment according to claim 4, characterized in that: The anti-detachment component includes an installation groove (508) formed at the bottom of the limiting plate (502) and arranged along its length. A transition rod (509) is rotatably connected to one side of the installation groove (508). A limiting strip (510) is fixedly sleeved on the surface of the transition rod (509). A limiting bolt (511) is passed through the bottom of the other end of the limiting strip (510). The screw of the limiting bolt (511) can pass through the limiting strip (510) and is threaded to the top inner wall of the other side of the installation groove (508).

6. The test container for testing the electrical insulation performance of enameled wire in a low-voltage environment according to claim 3, characterized in that: The crimping component includes crimping blocks (308) respectively disposed in the inner cavity of each set of connecting pipes (305). Each set of connecting pipes (305) is connected to an internal threaded pipe (312) on one side. Each set of internal threaded pipes (312) is threadedly connected to a push bolt (310) in the inner cavity. Each set of push bolts (310) is fixedly connected to a linkage rod (311) at the end. Each set of crimping blocks (308) has an adapter groove (309) corresponding to the linkage rod (311) on its back. Each set of linkage rods (311) is rotatably connected to the inner cavity of the corresponding side adapter groove (309). Rotating the push bolt (310) can push the crimping block (308) to the other side to crimp the enameled wire.

7. A test container for testing the electrical insulation performance of enameled wires in a low-voltage environment according to claim 3, characterized in that: The detachable component includes a threaded post (304) fixedly installed on the top of the connector (305). Each set of conductive bases (302) has a threaded groove (303) at the bottom and at the corresponding position of each set of threaded posts (304) for threaded connection of the threaded post (304). Each set of threaded posts (304) is threadedly connected to the inner cavity of the corresponding side threaded groove (303).

8. A test container for testing the electrical insulation performance of enameled wires in a low-voltage environment according to claim 3, characterized in that: Each set of conductive bases (302) has an isolation rectangular tube (400) on its outer surface. Each set of isolation rectangular tubes (400) has a fixing bolt (401) rotatably connected to the bottom of the front and rear sides. The screw of each set of fixing bolts (401) passes through the corresponding side isolation rectangular tube (400) upward and is threaded to the bottom surface of the outer cover (101).

9. A test container for testing the electrical insulation performance of enameled wires in a low-voltage environment according to claim 1, characterized in that: The connecting component includes connecting pipes (200) respectively disposed on the top of both sides of the outer cover (101). The opposite ends of the two sets of connecting pipes (200) are respectively sealed downward through the outer cover (101), and the opposite ends of the two sets of connecting pipes (200) are respectively connected to valves (201). The vacuum assembly includes a gas source connector (202) pipe connected to the end of one of the valves (201), and the other end of the gas source connector (202) pipe is connected to the vacuum equipment. The air pressure parameter monitoring component includes a three-way pipe (203) connected to the end of another set of valves (201), one branch of the three-way pipe (203) is connected to a first pressure sensor (204), and the other branch of the three-way pipe (203) is connected to a pressure gauge (205).

10. A test container for testing the electrical insulation performance of enameled wire in a low-voltage environment according to claims 1 to 9, characterized in that: An operation panel (104) and a controller (105) are installed on the lower side of the tank (100). The signal output terminal of the operation panel (104) is electrically connected to the signal input terminal of the controller (105) through a wire. The signal output terminal of the first pressure sensor (204) is electrically connected to the signal input terminal of the controller (105) through a wire. The bottom of the connecting strip (503) is fixedly connected to a second pressure sensor (505). The detection end of the second pressure sensor (505) abuts against the top of the limiting plate (502). The signal output end of the second pressure sensor (505) is connected to the signal input end of the controller (105) through a remote transmission module. The signal input end of the electric push rod (501) is electrically connected to the signal output end of the controller (105).

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