Coil winding withstand voltage test device

Abstract

The invention discloses a coil winding withstand voltage test device, which comprises a coil winding fixing module, a jig module, a liftable water tank module and a liftable voltage module, and is characterized in that the coil winding fixing module is fixed on the jig module; the liftable voltage module comprises a liftable high-voltage end conductor and a liftable low-voltage end conductor which are electrically connected with the high-voltage end and the low-voltage end of the withstand voltage tester respectively; a water absorbing material is arranged on the low-voltage end conductor; the liftable water tank module is aligned with the liftable voltage module; the liftable water tank module ascends to the lower part of the high-voltage end conductor and the low-voltage end conductor before the test is started so as to allow the water absorbing material to absorb water and descends after water absorption is completed; the jig module drives the coil winding fixing module to rotate, so that the coil winding fixing module fixed with the coil winding is rotated to the position below the high-voltage end conductor and the low-voltage end conductor after the water absorption material completes water absorption, and the high-voltage end conductor and the low-voltage end conductor press a copper wire and a magnetic ring of the coil winding respectively; and after the voltage withstanding test is completed, the coil winding fixing module is rotated and transferred out of the test station.

Description

Technical Field

[0001] The invention relates to a coil winding withstand voltage test device, belonging to the technical field of automated withstand voltage test. Background Art

[0002] During the winding process of the coil winding in the automated equipment, there are some uncontrollable factors in the winding and straightening process that may damage the paint cell film on the outer surface of the copper wire. In the use environment where the coil winding has a voltage resistance requirement, the above situation will cause potential risks. Therefore, it is necessary to conduct a voltage resistance test on the wound coil winding to ensure that the product is qualified for voltage resistance and meets the performance safety standards.

[0003] The devices currently used for voltage withstand testing of coil windings are as follows: Figure 1 As shown, the test process requires manually placing multiple magnetic rings into the same water tank, pressing the magnetic ring copper wire into the high-voltage end, and starting the withstand voltage tester for testing. This test device and method has the following problems:

[0004] 1. When the test results of the same group (including multiple magnetic rings) show unqualified, multiple tests are required to manually pick out the unqualified products in the same group. The single test result cannot accurately and specifically identify a certain magnetic ring, which does not meet the use requirements of the automated assembly line;

[0005] 2. In manual inspection, the length of the copper wire immersed in water near the magnetic ring varies. The detection length is greater than the effective wire length used by the magnetic ring, which increases the withstand voltage detection range and has a high misjudgment rate.

[0006] Therefore, it is necessary to improve the existing coil winding withstand voltage test device to overcome the above problems. Summary of the invention

[0007] The main purpose of the present invention is to overcome the shortcomings of the prior art and to provide an automated coil winding withstand voltage test device to solve the problem that the existing test method cannot adapt to the automated assembly line and the withstand voltage detection misjudgment rate is relatively high.

[0008] A coil winding withstand voltage test device, comprising a coil winding fixing module, a fixture module, a liftable water tank module and a liftable voltage module, wherein the coil winding fixing module is fixed on the fixture module and is used to fix the coil winding to be tested; the liftable voltage module comprises a liftable high-voltage end conductor and a low-voltage end conductor, which are respectively electrically connected to the high-voltage end and the low-voltage end of a withstand voltage tester; a water-absorbing material is arranged on the low-voltage end conductor; the liftable water tank module is aligned with the liftable voltage module in the vertical direction; the liftable water tank module is used to lift the water tank module before the test starts. The jig module is used to drive the coil winding fixing module to rotate, so as to rotate the coil winding fixing module fixed with the coil winding to be tested to below the high-voltage end conductor and the low-voltage end conductor after the water absorbing material completes water absorption, and rotate the coil winding fixing module out of the test station after the withstand voltage test is completed; the high-voltage end conductor is used to press the copper wires on both sides of the coil winding magnetic ring located at the test station, and the low-voltage end conductor is used to press the magnetic ring of the coil winding located at the test station.

[0009] Furthermore, the coil winding fixing module includes a module body, a magnetic ring fixing part and a copper wire fixing part, the magnetic ring fixing part is located in the middle of the module body, the copper wire fixing part is respectively located at the two side edges of the middle of the module body, and the magnetic ring fixing part and the copper wire fixing part are parallel to each other in the length direction of the module body.

[0010] Furthermore, the magnetic ring fixing portion includes a plurality of fixing points arranged along the length direction, and the copper wire fixing portion includes a plurality of groups of slots arranged along the length direction, each of the fixing points is used to fix the magnetic ring of a coil winding, and each group of the slots is used to clamp the copper wires on both sides of the magnetic ring of a coil winding.

[0011] Furthermore, a waterproof groove is arranged between two adjacent fixed acupoints; and a drainage groove is opened at the fixed acupoints.

[0012] Furthermore, the jig module includes a rotation drive mechanism and a jig movable seat connected to the rotation drive mechanism, and the jig movable seat can rotate under the drive of the rotation drive mechanism; the middle area of ​​the jig movable seat is used to be connected and fixed with the rotation drive mechanism, and the two end areas are respectively used to be connected and fixed with the coil winding fixing module.

[0013] Furthermore, copper wire end limiting units are provided on both sides of the coil winding fixing module on the jig moving seat, and when the coil winding is fixed on the coil winding fixing module, the ends of the copper wires on both sides of its magnetic ring do not exceed the outer edge of the copper wire end limiting units.

[0014] Furthermore, the voltage-adjustable module includes a voltage-end lifting mechanism, a conductor fixing seat connected to the voltage-end lifting mechanism, and the high-voltage-end conductor and the low-voltage-end conductor fixed to the lower surface of the conductor fixing seat.

[0015] Furthermore, the liftable water tank module is located below the conductor fixing seat and is aligned with the conductor fixing seat in the vertical direction; the liftable water tank module includes a water tank lifting mechanism and a water tank connected to the top of the water tank lifting mechanism, and the water tank can rise under the drive of the water tank lifting mechanism to allow the water-absorbing material to absorb water, and descend and reset after the water-absorbing material completes absorbing water.

[0016] Furthermore, the water tank comprises an inner tank and an outer tank surrounding the inner tank, the top of the inner tank is higher than the top of the outer tank; the inner tank is connected to a water inlet for holding water for the water-absorbing material to absorb; the outer tank is connected to a drain outlet.

[0017] Furthermore, the high-voltage end conductor includes a high-voltage end copper block and a low-voltage end copper block arranged on the lower surface of the conductor fixing seat, wherein the lower end surface of the low-voltage end copper block is processed with a groove for embedding the water-absorbing material, and the water-absorbing material protrudes from the lower end surface of the low-voltage end copper block when fixed in the groove.

[0018] The beneficial effects of the technical solution of the present invention include: the coil winding withstand voltage test device of the present invention fixes the coil winding to be tested through the coil winding fixing module, and then drives the coil winding fixing module to rotate through the fixture module, and can automatically travel between the test station and the station for placing / removing the coil winding; when the test station is idle, the water tank of the liftable water tank module rises to make the water absorbing material of the liftable voltage module absorb water, and after the water absorption is completed, the water tank descends to vacate the test station, and then the coil winding fixing module loaded with the coil winding is rotated to the test station, at this time, the low-voltage end conductor and the high-voltage end conductor of the liftable voltage module descend, respectively pressing the magnetic ring of the coil winding and the copper wires on both sides of the magnetic ring, and the tester can be turned on to perform the withstand voltage test. After the test is completed, the coil winding fixing module is rotated out of the test station by rotating the fixture module, and is ready to enter the next set of automatic tests, thereby realizing automated testing and meeting the requirements of automated assembly lines. The present invention arranges water-absorbing material at the low-pressure end to ensure that only a small section of copper wire with a fixed length around the magnetic ring is immersed in water, so as to control the length of the copper wire around the magnetic ring to be detected, thereby making the detection result more accurate and reducing the misjudgment rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of an existing coil winding withstand voltage test device.

[0020] Figure 2 It is a three-dimensional schematic diagram of a coil winding withstand voltage testing device according to an embodiment of the present invention.

[0021] Figure 3 It is a front view of the coil winding withstand voltage testing device according to an embodiment of the present invention.

[0022] Figure 4 It is a left view of the coil winding withstand voltage testing device according to an embodiment of the present invention.

[0023] Figure 5 Schematic diagram of a coil winding fixing module 1 in a coil winding withstand voltage testing device according to an embodiment of the present invention.

[0024] Figure 6 Schematic diagram of a fixture module 2 in a coil winding withstand voltage test device according to an embodiment of the present invention.

[0025] Figure 7 Schematic diagram of a liftable water tank module 3 in a coil winding withstand voltage test device according to an embodiment of the present invention.

[0026] Figure 8 Schematic diagram of the voltage-raising and lowering module 4 in the coil winding withstand voltage testing device according to an embodiment of the present invention.

[0027] Explanation of the reference numerals: 100-magnetic ring, 101 copper wire; 1-coil winding fixing module, 11-fixed acupoint, 12-card slot, 13-waterproof slot; 2-jig module, 21-rotation drive mechanism, 210-base, 211-servo motor, 212-reducer, 213-bearing seat, 214-central rotating shaft, 215-end cover, 22-jig moving seat, 221, 222-coil winding fixing module seat, 223-foam sponge seat, 224-foam sponge; 3-liftable water tank module, 31-water tank lifting mechanism, 32-water tank, 321-water inlet, 322-drain outlet, 323-liquid level sensor, 324-peristaltic pump; 4-liftable voltage module, 41-voltage end lifting mechanism, 42-conductor fixing seat, 43-high voltage end conductor, 44-low voltage end conductor, 45-bottom plate, 46-water-absorbing sponge. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods and examples. It should be understood that the purpose of providing the examples is only to illustrate rather than to limit.

[0029] In addition, spatial orientation words such as "up", "down", "left", "right", "top" and "bottom" used in the description of the technical solution of the present invention are for the convenience of describing the relative position relationship between the components of the product, and do not mean that the product has only the orientation shown in the figure. In actual use, as the product orientation is different (for example, rotated 90 degrees or other orientations), the spatial related descriptions used to describe its orientation should also be interpreted in a similar manner.

[0030] The present invention provides a coil winding withstand voltage test device, please refer to Figures 2 to 4 The withstand voltage test device mainly includes four modules: a coil winding fixing module 1, a fixture module 2, a liftable water tank module 3 and a liftable voltage module 4. The coil winding fixing module 1 is fixed on the fixture module 2 to fix the coil winding to be tested. Figures 5 to 8 The structures and functions of the coil winding fixing module 1, the fixture module 2, the liftable water tank module 3 and the liftable voltage module 4 as well as the principle of their cooperation to realize the withstand voltage test are described in detail.

[0031] Please refer to Figure 5 , is a schematic diagram of an exemplary structural design of the coil winding fixing module 1. Figure 5 As shown, the coil winding fixing module 1 includes a module body, a magnetic ring fixing part and a copper wire fixing part, wherein the magnetic ring fixing part is located in the middle of the module body, and the copper wire fixing part is arranged at the left and right edges of the middle, that is, the left and right sides of the magnetic ring fixing part are respectively provided with the same copper wire fixing part (which can be recorded as the first copper wire fixing part and the second copper wire fixing part); and the magnetic ring fixing part and the first and second copper wire fixing parts are parallel to each other in the length direction of the module body. During the test, the magnetic ring 100 of the coil winding is fixed on the middle magnetic ring fixing part, and the copper wires 101 on both sides of the magnetic ring are respectively fixed on the copper wire fixing parts on both sides.

[0032] Continue to refer Figure 5 In some preferred embodiments, the magnetic ring fixing part includes a plurality of fixed acupoints 11 arranged along the length direction, the first copper wire fixing part and the second copper wire fixing part respectively include a plurality of groups of slots 12 arranged along the length direction, and the number of groups of slots of the first copper wire fixing part, the number of groups of slots of the second copper wire fixing part and the number of fixed acupoints 11 are equal; each fixed acupoint 11 can be used to fix a magnetic ring 100 of a coil winding, and a group of slots of the first copper wire fixing part and a group of slots of the second copper wire fixing part at the corresponding position can be used to clamp the copper wires 101 on both sides of the magnetic ring of a coil winding. Since there are two copper wires on both sides of the magnetic ring, a group of slots includes two slots. In a more preferred solution, a waterproof groove 13 is provided between two adjacent fixed acupoints to prevent the adjacent magnetic rings from being connected due to water flow during the withstand voltage test and causing misjudgment; further, a drainage groove is provided in the middle of the fixed acupoint 11, so that the excess water in the fixed acupoint can be discharged in time. In addition, the groove width of the copper wire slot can be about 0.1 mm greater than the diameter of the copper wire.

[0033] Please refer to Figure 6 , is a schematic diagram of an exemplary structural design of the fixture module 2. Figure 6As shown, the jig module 2 includes a rotating drive mechanism 21 and a jig moving seat 22 connected to the rotating drive mechanism 21. The jig moving seat 22 can rotate synchronously under the drive of the rotating drive mechanism 21. The middle area of ​​the jig moving seat 22 is used to connect and fix with the rotating drive mechanism 21. The two end areas can respectively fix a coil winding fixing module, that is, a double station. When the coil winding fixing module on one side is tested, the coil winding fixing module on the other side can load or unload the coil winding. A coil winding fixing module seat 221, 222 can be fixed at each of the two end areas, and then the two coil winding fixing modules are fixed to the two coil winding fixing module seats 221 and 222 respectively.

[0034] Continue to refer Figure 6 In some preferred embodiments, the fixture moving seat 22 is provided with copper wire end limit units on both sides of the coil winding fixing module seats 221 and 222 (i.e., on both sides of the two coil winding fixing modules), respectively, for fixing the copper wire ends on both sides of the magnetic ring of the coil winding on the coil winding fixing module 1. Specifically, the copper wire end limit units may include, for example, a foam sponge seat 223 and a plurality of high temperature resistant foam sponges 224 fixed on the foam sponge seat 223, and the positions of the foam sponges 224 correspond to the positions of the fixed acupuncture points and the card slots on the coil winding fixing module 1, and are in a straight line. When the coil winding is fixed on the coil winding fixing module 1, the tail ends of the copper wires on both sides of the magnetic ring are placed on the foam sponge, the ends of the copper wires do not extend beyond the foam sponge, and the height of the copper wires from the plane of the high temperature resistant foam sponge is about ±1 mm.

[0035] Continue to refer Figure 6 In some preferred embodiments, the rotation drive mechanism 21 of the fixture module 2 includes a base 210, a servo motor 211, a reducer 212, a bearing seat 213, a central rotating shaft 214 and an end cover 215. The base 210 is fixed, the reducer 212 is connected to the base 210 by bolts, the servo motor 211 is connected to the reducer 212, and the bearing seat 213 is connected to the base 210; the fixture moving seat 22 is connected to the end cover 215; the central rotating shaft 214 passes through the bearing seat 213, one end is connected to the servo motor 211 by a flat key, and the other end is connected to the end cover 215 by a flat key, and the fixture moving seat 22 is driven to rotate by the servo motor 211.

[0036] refer to Figure 7 , is a schematic diagram of an exemplary structural design of the liftable water tank module 3. Figure 7As shown, the liftable water tank module 3 includes a water tank lifting mechanism 31 and a water tank 32 connected to the top of the water tank lifting mechanism, and the water tank 32 can rise / fall under the drive of the water tank lifting mechanism 31. The water tank lifting mechanism 31 can be, for example, a lifting cylinder. The water tank 32 includes an inner tank and an outer tank surrounding the outer periphery of the inner tank, wherein the top of the inner tank is higher than the top of the outer tank, the inner tank is flush with the bottom of the outer tank, the inner tank is connected to a water inlet 321, and the outer tank is connected to a drain 322. In addition, the water tank is also equipped with a liquid level sensor 323 for detecting the liquid level of the inner tank. The liquid level of the inner tank needs to be maintained at the highest level, and the overflowed water is collected by the outer tank and discharged to the water tank through the drain (not shown in the figure); when the liquid level of the inner tank is lower than the highest level and needs to be replenished, water is pumped from the water tank through the water inlet 321 into the inner tank through the peristaltic pump 324, and there is a water cycle of inner tank-outer tank-water tank-inner tank.

[0037] refer to Figure 8 , is a schematic diagram of an exemplary structural design of the voltage-adjustable module 4. Figure 8 As shown, the voltage-adjustable module 4 includes a voltage-end lifting mechanism 41, a conductor fixing seat 42 connected to the voltage-end lifting mechanism 41, and a high-voltage end conductor 43 and a low-voltage end conductor 44 fixed to the lower surface of the conductor fixing seat 42, wherein the high-voltage end conductor 43 and the low-voltage end conductor 44 can be, for example, copper blocks, the high-voltage end copper block is used to be electrically connected to the high-voltage end of the withstand voltage tester, and the low-voltage end copper block is used to be electrically connected to the low-voltage end of the withstand voltage tester.

[0038] Continue to refer Figure 8 In some preferred embodiments, the voltage end lifting mechanism 41 can be a lifting cylinder, and a lifting cylinder is connected to the left and right sides of the lower surface of the conductor fixing seat 42 respectively to jointly realize the lifting of the conductor fixing seat 42. The two lifting cylinders are fixed on a bottom plate 45, and the lifting cylinder of the water tank is also fixed on the bottom plate 45. The water tank and its lifting cylinder are located directly below the conductor fixing seat 42, so that the water tank can face the low-voltage end copper block. A groove is provided on the lower end surface of the low-voltage end copper block, and a water-absorbing material such as a water-absorbing sponge 46 is embedded in the groove, and the water-absorbing sponge 46 protrudes from the lower end surface of the low-voltage end copper block.

[0039] In a specific embodiment, Figure 2The state shown is recorded as the initial state, at which the water tank lifting cylinder is closed, the water tank is at the initial position, and the lifting cylinder of the voltage end lifting mechanism is opened. The coil winding to be tested is placed on the coil winding fixing module, wherein the magnetic ring 101 is placed in the fixed acupuncture point 11, and the copper wire 101 is stuck in the card slot 12; then, the fixture module 2 drives the coil winding fixing module on which the product to be tested has been placed to rotate 90° counterclockwise for the first time, and rotates to a state where the length direction of the fixture moving seat is parallel to the length direction of the conductor fixing seat and the water tank. At this time, the water tank lifting cylinder is opened, and the water tank is raised to a predetermined position and stays for a period of time (for example, 1 to 2 seconds) and then lowered. This process allows the water-absorbing material such as a sponge embedded in the low-voltage end to absorb water; then, the fixture module 2 continues to rotate 90° counterclockwise for the second time, so that the coil winding fixing module loaded with the product to be tested is transferred to the bottom of the conductor fixing seat, the voltage end lifting cylinder is closed, the high-voltage end copper block presses the copper wires on both sides of the coil winding, and the low-voltage end copper block presses the magnetic ring to achieve electrical connection, and the withstand voltage tester is powered on to detect the withstand voltage capacity of the coil winding. After staying for 2-3S, the voltage end lifting cylinder rises. While this test process is in progress, the coil winding fixing module on the other side of the fixture moving seat can simultaneously load the product to be tested. Then the fixture module 2 rotates 90° counterclockwise for the third time to bring the coil winding fixing module carrying the tested product out of the test station. At this time, the water tank lifting cylinder opens, and the water tank rises and stays for 1-2S before descending. This process allows the low-voltage end copper block to absorb water like a sponge. Then the fixture module 2 rotates 90° counterclockwise for the fourth time, so that the coil winding fixing module on the other side, which has been loaded with the product to be tested, is transferred to the test station and the same test process is carried out. This is repeated to achieve automated withstand voltage testing.

[0040] The withstand voltage test device of the embodiment of the present invention has the following characteristics:

[0041] 1) Use water as the medium to wet the periphery of the magnetic ring (low-voltage end), and connect the copper wire end to the high-voltage end to achieve conduction and detect whether the copper wire of the coil winding is damaged.

[0042] 2) The coil winding is fixed on a special device, and the magnetic ring and copper wire are placed on different sides to facilitate the distinction between the high and low voltage ends.

[0043] 3) The low-voltage end retains water by dipping a sponge in water, making it easier to squeeze it around the magnetic ring during the withstand voltage test.

[0044] 4) Fix the coil winding on a special device and move it to the corresponding positions of the high and low voltage ends. The high and low voltage ends move to contact the coil winding copper wire and magnetic ring to complete the withstand voltage test detection method.

[0045] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art of the present invention, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A coil winding withstand voltage test device, characterized in that: It comprises a coil winding fixing module (1), a fixture module (2), a liftable water tank module (3) and a liftable voltage module (4), wherein the coil winding fixing module (1) is fixed on the fixture module (2) and is used to fix the coil winding to be tested; The voltage-adjustable module (4) comprises an adjustable high-voltage end conductor and an adjustable low-voltage end conductor, which are electrically connected to the high-voltage end and the low-voltage end of the withstand voltage tester respectively; a water-absorbing material is arranged on the low-voltage end conductor; The liftable water tank module (3) and the liftable voltage module (4) are aligned in the vertical direction; The liftable water tank module (3) is used to rise before the test starts to allow the water absorbing material to absorb water, and to fall after the water absorption is completed; The jig module (2) is used to drive the coil winding fixing module (1) to rotate, so that after the water absorbing material has completed absorbing water, the coil winding fixing module (1) fixed with the coil winding to be tested is rotated to below the high-voltage end conductor and the low-voltage end conductor, and after the withstand voltage test is completed, the coil winding fixing module (1) is rotated and moved out of the test station; the high-voltage end conductor is used to press the copper wires on both sides of the coil winding magnetic ring located at the test station, and the low-voltage end conductor is used to press the magnetic ring of the coil winding located at the test station.

2. The coil winding withstand voltage test device according to claim 1, characterized in that: The coil winding fixing module (1) comprises a module body, a magnetic ring fixing portion and a copper wire fixing portion, wherein the magnetic ring fixing portion is located in the middle of the module body, and the copper wire fixing portion is located at two side edges of the middle of the module body, and the magnetic ring fixing portion and the copper wire fixing portion are parallel to each other in the length direction of the module body.

3. The coil winding withstand voltage test device according to claim 2, characterized in that: The magnetic ring fixing portion comprises a plurality of fixing points (11) arranged along the length direction, and the copper wire fixing portion comprises a plurality of groups of clamping grooves (12) arranged along the length direction, each of the fixing points being used to fix a magnetic ring (100) of a coil winding, and each group of the clamping grooves being used to clamp the copper wires (101) on both sides of the magnetic ring of a coil winding.

4. The coil winding withstand voltage test device according to claim 3, characterized in that: A waterproof groove (13) is arranged between two adjacent fixed acupuncture points; and a drainage groove is provided at each fixed acupuncture point.

5. The coil winding withstand voltage test device according to claim 1, characterized in that: The jig module (2) comprises a rotary drive mechanism and a jig movable seat connected to the rotary drive mechanism, and the jig movable seat can rotate under the drive of the rotary drive mechanism; the middle area of ​​the jig movable seat is used to be connected and fixed to the rotary drive mechanism, and the two end areas are respectively used to be connected and fixed to the coil winding fixing module (1).

6. The coil winding withstand voltage test device according to claim 5, characterized in that: Copper wire end limiting units are arranged on both sides of the coil winding fixing module (1) on the jig moving seat, and when the coil winding is fixed on the coil winding fixing module (1), the ends of the copper wires on both sides of the magnetic ring do not exceed the outer edges of the copper wire end limiting units.

7. The coil winding withstand voltage test device according to claim 1, characterized in that: The voltage-liftable module (4) comprises a voltage-end lifting mechanism, a conductor fixing seat connected to the voltage-end lifting mechanism, and the high-voltage-end conductor and the low-voltage-end conductor fixed to the lower surface of the conductor fixing seat.

8. The coil winding withstand voltage test device according to claim 7, characterized in that: The liftable water tank module (3) is located below the conductor fixing seat and is aligned with the conductor fixing seat in the vertical direction; the liftable water tank module (3) comprises a water tank lifting mechanism and a water tank connected to the top of the water tank lifting mechanism; the water tank can be lifted up by the water tank lifting mechanism to allow the water absorbing material to absorb water, and can be lowered and reset after the water absorbing material has finished absorbing water.

9. The coil winding withstand voltage test device according to claim 8, characterized in that: The water tank comprises an inner tank and an outer tank surrounding the inner tank, wherein the top of the inner tank is higher than the top of the outer tank; the inner tank is connected with a water inlet for containing water for the water absorbing material to absorb; the outer tank is connected with a drain outlet.

10. The coil winding withstand voltage test device according to claim 7, characterized in that: The high-voltage end conductor includes a high-voltage end copper block and a low-voltage end copper block arranged on the lower surface of the conductor fixing seat, wherein the lower end surface of the low-voltage end copper block is processed with a groove for embedding the water-absorbing material, and the water-absorbing material protrudes from the lower end surface of the low-voltage end copper block when fixed in the groove.

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