Leakage testing device for oil-immersed transformer

Abstract

The utility model belongs to the field of testing of fluid sealing performance of transformers, and particularly relates to a leakage testing device for an oil-immersed transformer. In order to conveniently fix the transformer, the utility model provides the leakage testing device for the oil-immersed transformer. The leakage testing device for the oil-immersed transformer comprises a supporting piece, a front clamping mechanism, a rear clamping mechanism, a left clamping mechanism and a right clamping mechanism, the front clamping mechanism and the rear clamping mechanism are matched with the supporting piece in a guiding and moving mode in the front-back direction, and the left clamping mechanism and the right clamping mechanism are matched with the supporting piece in a guiding and moving mode in the left-right direction; the leakage testing device for the oil-immersed transformer further comprises a direct-acting driving mechanism with the output end capable of moving in the vertical direction and a rigid transmission part used for enabling the output end to be in transmission connection with the clamping mechanisms respectively, the direct-acting driving mechanism is located under the supporting part, one end of the rigid transmission part is hinged to the output end, and the other end of the rigid transmission part is hinged to the clamping mechanisms. One direct-acting driving mechanism is used for driving the four clamping mechanisms to move at the same time, and therefore the transformer can be fixed conveniently.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of fluid seal test of transformer, especially relate to a leak test device for oil immersed transformer. BACKGROUND

[0002] In the production process of the oil immersed transformer, the oil immersed transformer must be tested for leakage to prevent oil leakage of the oil immersed transformer during use.

[0003] The utility model discloses a kind of transformer pressure leak test devices, and the leak test device includes oil tank, the lower end of oil tank is communicated with the oil inlet pipe on transformer box body, the upper end of oil tank is equipped with gas pressure connector, and oil level gauge is equipped on oil tank.

[0004] When leak test is carried out using the above leak test device, high-pressure gas is introduced into the oil tank containing insulating oil through the gas pressure connector, and the oil in the oil tank enters the oil tank of the transformer through the oil inlet pipe. After a short period of time, the oil level in the oil tank stabilizes at a value, at this time, the transformer tank is filled with high-pressure insulating oil. Then, stand for 6-12 hours, observe whether the reading of the oil level gauge changes, if not, it proves that the transformer does not leak, if it changes, it proves that the transformer leaks.

[0005] When the above leak test device is used for testing, the transformer must be fixed on the test bench using the fixing clamp. In actual production process, since the transformer has multiple specifications, and different fixing clamps need to be used for each type of transformer, the test efficiency is low.

[0006] To solve the above problems, the utility model discloses a kind of transformer seal test device, and in the seal test device, four limit seats (equivalent to front clamping mechanism, rear clamping mechanism, left clamping mechanism and right clamping mechanism) for clamping the front, rear, left and right four sides of transformer are arranged on the placing disc (equivalent to support) for supporting transformer, each limit seat is provided with an adjusting bolt for driving the limit seat to approach the transformer, so that the four limit seats clamp the transformer together.

[0007] When the above seal test device is used for testing, the staff must manually screw each jack, so that the four limit seats clamp the transformer, which is very inconvenient to use. UTILITY MODEL CONTENTS

[0008] The utility model discloses a leak detection device for oil immersed transformer, which is used to solve the technical problem of inconvenient fixing of the transformer during the leak detection test.

[0009] To achieve the above object, the utility model provides a leak detection device for oil immersed transformer technical scheme is:

[0010] A leak detection device for oil immersed transformer, which comprises a support for supporting the oil immersed transformer, and a front clamping mechanism, a rear clamping mechanism, a left clamping mechanism and a right clamping mechanism for clamping the front, rear, left and right four sides of the oil immersed transformer respectively, the front clamping mechanism and the rear clamping mechanism are guided and moved in the front-rear direction in cooperation with the support, and the left clamping mechanism and the right clamping mechanism are guided and moved in the left-right direction in cooperation with the support; the leak detection device for oil immersed transformer further comprises a straight drive mechanism capable of moving in the up-down direction at the output end and a rigid transmission member for transmission connection of the output end and each clamping mechanism, the straight drive mechanism is located directly below the support, one end of the rigid transmission member is hinged to the output end, and the other end is hinged to the clamping mechanism, so as to drive each clamping mechanism to approach or move away from the oil immersed transformer simultaneously.

[0011] Further, each clamping mechanism comprises an elastic buffer mechanism for direct contact with the oil immersed transformer, and each elastic buffer mechanism comprises an elastic member; for the left clamping mechanism and the right clamping mechanism, the elastic member can be deformed in the left-right direction, and for the front clamping mechanism and the rear clamping mechanism, the elastic member can be deformed in the front-rear direction.

[0012] Further, for any clamping mechanism, the clamping mechanism further comprises a moving seat connected with the rigid transmission member, the elastic buffer mechanism comprises a clamping member for direct contact with the oil immersed transformer, and the elastic member is arranged between the clamping member and the moving seat.

[0013] Further, for any clamping mechanism, a guide hole is arranged on the moving seat, the axial direction of the guide hole is the same as the moving direction of the moving seat, a guide rod is arranged on the clamping member and guided by the guide hole, and the elastic member is a compression spring sleeved on the guide rod.

[0014] Further, a through hole is arranged on the support and penetrates the support in the up-down direction, and a slide rail is arranged on the hole wall of the through hole; for any clamping mechanism, the clamping mechanism comprises a moving seat connected with the rigid transmission member, and the moving seat is guided and slidably connected with the support through the slide rail.

[0015] Further, the one end of each rigid transmission member hinged to the output end is located on the same circumference.

[0016] Further, the straight driving mechanism comprises a driving disc, a screw rod and a driving motor, the screw rod extends in the up-down direction, the driving disc is provided with a threaded hole matched with the screw rod, the driving motor is used for driving the screw rod to rotate to control the up-down movement of the driving disc, and the driving disc constitutes the output end.

[0017] Further, the screw rod is fixedly connected with a worm wheel, the axis of the worm wheel coincides with the axis of the screw rod, and the driving motor is drivingly connected with a worm gear.

[0018] Further, the support is provided with an oil delivery pump, and the oil delivery pump is provided with an oil delivery pipe connected with the oil inlet pipe of the oil-immersed transformer leak detection device.

[0019] Further, the oil delivery pipe is provided with a pressure sensor used for detecting the oil pressure in the oil delivery pipe.

[0020] The oil-immersed transformer leak detection device has the advantages that: the oil-immersed transformer leak detection device is an improved invention, and compared with the prior art, in the oil-immersed transformer leak detection device, the output end of the straight driving mechanism directly drives the synchronous movement of the front, rear, left and right four clamping mechanisms, and only one action of the output end can complete the clamping of the transformer, thereby facilitating the fixing of the transformer.

[0021] When the oil-immersed transformer leak detection device is used to perform a leak detection test, after the transformer is placed on the support, the output end of the straight driving mechanism starts to move downward, in the process of the downward movement of the output end, since the size of the rigid transmission member is unchanged, the clamping mechanisms gradually approach the transformer until the clamping mechanisms clamp the transformer, and after the test is completed, only the output end of the straight driving mechanism needs to move upward, and the clamping mechanisms can release the transformer, which is very convenient to use and is beneficial to shorten the time for fixing and releasing the transformer, thereby shortening the time of single test and improving the production efficiency of the oil-immersed transformer. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic view of the oil-immersed transformer leak detection device of the utility model;

[0023] Figure 2 It is a structural schematic view of the oil-immersed transformer leak detection device of the utility model after omitting part of the structure;

[0024] Figure 3 It is Figure 2 It is an enlarged view of structure at A in the middle;

[0025] Figure 4 It is a structural schematic view of the straight driving mechanism, the rigid transmission member and the clamping mechanism in the oil-immersed transformer leak detection device of the utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Test bench; 11. Support component; 111. Perforation; 1111. Slide rail; 2. Oil-immersed transformer; 3. Clamping mechanism; 31. Moving seat; 32. Clamping component; 33. Guide rod; 34. Compression spring; 4. Direct drive mechanism; 41. Lead screw; 42. Drive disc; 43. Worm gear; 44. Drive motor; 45. Worm; 5. Rigid transmission component; 6. Oil pump; 7. Oil pipe; 8. Pressure sensor; 9. Controller. Detailed Implementation

[0028] To address the problems in the background technology, the core inventive concept of this utility model is to utilize a direct-drive mechanism to simultaneously drive the movement of four clamping mechanisms (front, rear, left, and right), thereby conveniently fixing the transformer, shortening the time required to fix and release the transformer, and improving the production efficiency of the transformer.

[0029] The present invention will be further described in detail below with reference to the embodiments.

[0030] Specific embodiments of the leak testing device for oil-immersed transformers provided by this utility model:

[0031] like Figures 1-4 As shown, in a basic specific embodiment, the leak testing device for an oil-immersed transformer includes a support member 11 for supporting the oil-immersed transformer 2 and front clamping mechanisms, rear clamping mechanisms, left clamping mechanisms, and right clamping mechanisms for clamping the front, rear, left, and right sides of the oil-immersed transformer 2 respectively. The front and rear clamping mechanisms are guided and moved in a front-rear direction with the support member 11, and the left and right clamping mechanisms are guided and moved in a left-right direction with the support member 11. The leak testing device also includes a direct-drive mechanism 4 whose output end can move in a vertical direction and a rigid transmission member 5 for transmitting power between the output end and each clamping mechanism 3. The direct-drive mechanism 4 is located directly below the support member 11. One end of the rigid transmission member 5 is hinged to the output end, and the other end is hinged to the clamping mechanism 3, so that the output end simultaneously drives each clamping mechanism 3 to move closer to or away from the oil-immersed transformer 2. The rigid transmission member 5 can be a transmission rod, transmission plate, or other transmission structure, as long as the dimensions of the rigid transmission member 5 do not change significantly during operation. Figures 1-4 In the specific embodiment shown, the support member 11 is a support plate, which is part of the test bench 1. However, in other specific embodiments, the support member 11 can also be a support block or other structures. The specific structure of the support member 11 is not limited in this utility model, as long as the support member 11 can support the oil-immersed transformer 2.

[0032] Preferably, the ends of each rigid transmission component 5 that are hinged to the output end are all located on the same circumference, resulting in a simple structure.

[0033] But in other specific ways, for two rigid transmission members 5 articulated with left and right clamping mechanisms, the distance between the two rigid transmission members 5 and one end of the output end articulated is closer; for two rigid transmission members 5 articulated with front and rear clamping mechanisms, the distance between the two rigid transmission members 5 and one end of the output end articulated is farther.

[0034] Need to be specially pointed out is that, regardless of in which specific embodiment, when the lengths of all rigid transmission members 5 are the same, since the distance from the output end to the support 11 is the same, the movement speed of different clamping mechanisms 3 connected with different rigid transmission members 5 is the same.

[0035] Compared with the prior art, in the utility model, the output end of the direct drive mechanism 4 directly drives the synchronous movement of the four front, rear, left and right clamping mechanisms 3, and only one action of the output end is needed to complete the clamping of the transformer, which is convenient for fixing the transformer.

[0036] When the leak test is carried out by using the oil-immersed transformer leak test device provided by the utility model, after the transformer is placed on the support 11, the output end of the direct drive mechanism 4 starts to move downward, in the process of the downward movement of the output end, since the size of the rigid transmission member 5 is unchanged, each clamping mechanism 3 gradually approaches the transformer until each clamping mechanism 3 clamps the transformer; after the test is completed, only the output end of the direct drive mechanism 4 needs to be moved upward, and each clamping mechanism 3 can release the transformer, which is very convenient to use, and is beneficial to shorten the time for fixing and releasing the transformer, thereby shortening the time of single test and improving the production efficiency of the oil-immersed transformer 2.

[0037] In order to facilitate the person skilled in the art to understand the clamping mechanism 3 in the utility model, the clamping mechanism 3 is mainly introduced below.

[0038] In order to make the oil-immersed transformer leak test device applicable to more types of transformers, in one specific embodiment, each clamping mechanism 3 comprises an elastic buffer mechanism for directly contacting the oil-immersed transformer 2, and each elastic buffer mechanism comprises an elastic member; for the left and right clamping mechanisms, the elastic member can be deformed in the left-right direction, and for the front and rear clamping mechanisms, the elastic member can be deformed in the front-rear direction.

[0039] When the clamping mechanism 3 clamps the transformer, there are the following two cases:

[0040] The first case: the four clamping mechanisms 3 simultaneously contact the transformer, and then the elastic member is deformed, so that all the elastic buffer mechanisms clamp the transformer at the same time.

[0041] The second case: two clamping mechanisms 3 (which can be front and rear clamping mechanisms or left and right clamping mechanisms) first contact the transformer, then the elastic members in the elastic buffer mechanism in contact with the transformer are deformed until the other two clamping mechanisms 3 contact the transformer, and then the elastic members continue to deform, so that all the elastic buffer mechanisms simultaneously clamp the transformer.

[0042] By providing the elastic buffer mechanism, the leak testing device for oil-immersed transformers can be applied to the transformer in the second case, thereby increasing the number of types of transformers to which the leak testing device for oil-immersed transformers can be applied.

[0043] In other specific embodiments, the clamping mechanism 3 can also not include an elastic member, in which case the four clamping mechanisms 3 must simultaneously contact the transformer (i.e., only applicable to the transformer in the first case).

[0044] In the case where the clamping mechanism 3 includes an elastic member, in one specific embodiment, for any clamping mechanism 3, the clamping mechanism 3 further includes a moving seat 31 in transmission connection with the rigid transmission member 5, the elastic buffer mechanism includes a clamping member 32 for direct contact with the oil-immersed transformer 2, and the elastic member is arranged between the clamping member 32 and the moving seat 31, which is simple in structure. Among them, the clamping member 32 is preferably a clamping plate and a clamping block.

[0045] Preferably, in one specific embodiment, for any clamping mechanism 3, the moving seat 31 is provided with a guide hole, the axial direction of the guide hole is the same as the moving direction of the moving seat 31, the clamping member 32 is provided with a guide rod 33 in guiding cooperation with the guide hole, and the elastic member is a compression spring 34 sleeved on the guide rod 33, which is arranged between the clamping member 32 and the moving seat 31, which is simple in structure.

[0046] In other specific embodiments, the guide hole is a through hole, one end of the guide rod 33 is connected with a stopper (such as a nut) after passing through the guide hole, the elastic member is a tension spring sleeved on the guide rod 33, and the tension spring is arranged between the stopper and the moving seat 31, and the two ends of the tension spring are fixedly connected with the stopper and the moving seat 31 by welding or the like.

[0047] In other specific embodiments, an elastic pad can also be directly arranged on the side of the moving seat 31 close to the oil-immersed transformer 2, and the elastic pad constitutes the elastic member and the elastic buffer mechanism.

[0048] In order to simplify the structure and facilitate the guiding and moving cooperation of the support 11 and the clamping mechanism 3, as a specific embodiment, the support 11 is provided with a through hole 111 penetrating through the support 11 in the up-down direction, and the hole wall of the through hole 111 is provided with a sliding rail 1111; for any clamping mechanism 3, the clamping mechanism 3 comprises a moving seat 31 in transmission connection with the rigid transmission member 5, and the moving seat 31 is in guiding and sliding cooperation with the support 11 through the sliding rail 1111, and the structure is simple.

[0049] In the specific embodiment shown in the specific embodiment, the hinge of the moving seat 31 and the rigid transmission member 5 is located below the through hole 111. Figure 3

[0050] In other specific embodiments, the hinge of the moving seat 31 and the rigid transmission member 5 can also be located in the through hole 111, at this time, the thickness of the support 11 is relatively thick, and the through hole 111 is also used for avoiding the rigid transmission member 5.

[0051] In other specific embodiments, the upper end surface of the support 11 is provided with a dovetail groove, the dovetail groove is located on both sides of the through hole 111, the moving seat 31 is in guiding and sliding cooperation with the support 11 through the dovetail groove, the hinge of the moving seat 31 and the rigid transmission member 5 is located above the support 11, and the through hole 111 constitutes an avoiding hole for avoiding the rigid transmission member 5.

[0052] In other specific embodiments, tracks can also be arranged on both sides of the through hole 111, and the moving seat 31 is provided with walking wheels capable of walking along the tracks, at this time, the moving seat 31 is in guiding and rolling cooperation with the support 11 through the tracks.

[0053] In the utility model, the guiding and moving cooperation mode of the support 11 and each clamping mechanism 3 is not limited, as long as each clamping mechanism 3 can cooperate with the support 11, so that each clamping mechanism 3 can only move in the left-right direction or the front-rear direction (at this time, each clamping mechanism 3 cannot move in the up-down direction).

[0054] In order to facilitate the person skilled in the art to understand the direct drive mechanism 4 in the utility model, the direct drive mechanism 4 is mainly introduced below.

[0055] In the specific embodiment shown in the specific embodiment, the direct drive mechanism 4 comprises a driving disc 42, a lead screw 41 and a driving motor 44, the lead screw 41 extends in the up-down direction, the driving disc 42 is provided with a threaded hole in threaded cooperation with the lead screw 41, the driving motor 44 is used for driving the lead screw 41 to rotate, so as to control the up-down movement of the driving disc 42, and the driving disc 42 constitutes the output end. Figures 2-4

[0056] ​​Under the premise that the drive motor 44 rotates at the same speed, when the pitch on the lead screw 41 is different, the speed of the drive disk 42 moving up and down is different, which makes the speed of the clamping mechanism 3 moving horizontally different, so as to facilitate the adjustment of the movement speed of the clamping mechanism 3.

[0057] Preferably, in one specific embodiment, a worm gear 43 is fixedly connected to the lead screw 41, the axis of the worm gear 43 coincides with the axis of the lead screw 41, and a worm 45 is driven and connected to the drive motor 44, with the worm 45 and worm gear 43 engaging in a transmission cooperation. In this case, the lower end of the lead screw 41 is rotatably mounted on the test bench 1 via a bearing to ensure that the lead screw 41 does not move up and down; the drive motor 44 is arranged horizontally (or the axis of the output shaft of the drive motor 44 is perpendicular to the axis of the lead screw 41), thereby reducing the height of the entire leak testing device for oil-immersed transformers, making the structure of the entire leak testing device for oil-immersed transformers more compact and improving space utilization.

[0058] In other specific embodiments, the direct drive mechanism 4 may also be composed of a drive motor 44 and a reducer. The drive motor 44 is arranged vertically, and the axis of the output shaft of the drive motor 44 coincides with the axis of the lead screw 41. The output shaft of the drive motor 44 is connected to the reducer for transmission, and the output end of the reducer is hinged to the rigid transmission member 5.

[0059] In other specific embodiments, the direct drive mechanism 4 can also be an electric telescopic rod, with the output end of the electric telescopic rod hinged to the rigid transmission member 5.

[0060] In other specific embodiments, the direct drive mechanism 4 can also be a direct drive mechanism 4 such as a direct drive cylinder, a direct drive electric cylinder, or a direct drive hydraulic cylinder, which will not be described in detail here.

[0061] To facilitate leak testing of the oil-immersed transformer 2, the following accessories are also provided on the support member 11 in this utility model:

[0062] exist Figure 1 In the specific embodiment shown, an oil pump 6 is installed on the support member 11, and the oil pump 6 is equipped with an oil pipe 7 for connecting to the oil inlet pipe of the leak testing device for the oil-immersed transformer. Preferably, a pressure sensor 8 for detecting the oil pressure inside the oil pipe 7 is also installed on the oil pipe 7.

[0063] In use Figure 1 When conducting a leak test in the specific implementation shown, firstly, connect the oil outlet pipe of the oil depot to the oil pump 6, and connect the oil pipe 7 to the oil inlet pipe; then, pump high-voltage insulating oil into the oil tank of the oil-immersed transformer 2 through the oil pump 6 and the oil pipe 7; then, turn off the oil pump 6 and wait for an appropriate time; finally, check whether there is any oil leakage in the oil-immersed transformer 2.

[0064] When the pressure sensor 8 is installed on the oil delivery pipe 7, after the oil delivery pump 6 is closed and waits for a suitable time, if the reading of the pressure sensor 8 does not change significantly, it proves that the oil-immersed transformer 2 does not leak oil; if the reading of the pressure sensor 8 changes significantly, it proves that the oil-immersed transformer 2 leaks oil, at this time, the staff also needs to check the oil-immersed transformer 2 to determine the location of the oil leakage.

[0065] In the specific embodiments shown in the specific embodiments, the test bench 1 is also provided with a controller 9, through which the working state of the oil delivery pump 6 and the driving motor 44 can be conveniently controlled. Figures 1-4

[0066] In other specific embodiments, the test bench 1 can not be provided with the controller 9, and the staff controls the working state of the driving motor 44 and the oil delivery pump 6 through the remote controller.

[0067] In other specific embodiments, the pressure sensor 8 can also not be provided on the oil delivery pipe 7, at this time, after the oil delivery pump 6 is closed and waits for a suitable time, the staff needs to check the oil-immersed transformer 2 to determine whether the transformer leaks oil.

[0068] In other specific embodiments, the oil-immersed transformer leak detection device can also not include the oil delivery pipe 7 and the oil delivery pump 6, and the oil delivery pipe 7 and the oil delivery pump 6 are located on the test site.

[0069] In other specific embodiments, with reference to the Chinese utility model patent with authorization announcement No. CN213842560U, an oil pressure tank is provided on the support 11 of the utility model, the lower end of the oil pressure tank is connected with the oil delivery pipe 7 for connecting with the oil inlet pipe, the upper end of the oil pressure tank is provided with a gas pressure connector, and the oil pressure tank is provided with an oil level gauge.

[0070] Finally, it needs to be pointed out that the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments without paying creative labor, or make equivalent replacement to part of the technical features, or organically combine different specific embodiments, so as to combine the specific embodiments given in the Figures 1-4 of course, those skilled in the art can also combine the specific embodiments not given in the remaining drawings of the specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.​

Claims

1. A leak testing device for an oil-immersed transformer, comprising a support for supporting an oil-immersed transformer and a front clamping mechanism, a rear clamping mechanism, a left clamping mechanism, and a right clamping mechanism for clamping four side surfaces of the oil-immersed transformer, respectively, characterized in that, The front clamping mechanism and the rear clamping mechanism are guided and moved along the front-rear direction with the support, and the left clamping mechanism and the right clamping mechanism are guided and moved along the left-right direction with the support; the oil-immersed transformer leak detection device further comprises a direct-acting driving mechanism capable of moving along the up-down direction, and a rigid transmission member for transmission connection of the output end and each clamping mechanism, the direct-acting driving mechanism is located directly below the support, one end of the rigid transmission member is hinged to the output end, and the other end is hinged to the clamping mechanism, so as to drive the output end to simultaneously drive each clamping mechanism to approach or move away from the oil-immersed transformer.

2. The leak testing device for oil-immersed transformers according to claim 1, characterized in that, Each clamping mechanism comprises an elastic buffer mechanism for direct contact with the oil-immersed transformer, and each elastic buffer mechanism comprises an elastic member; for the left clamping mechanism and the right clamping mechanism, the elastic member can be deformed along the left-right direction, and for the front clamping mechanism and the rear clamping mechanism, the elastic member can be deformed along the front-rear direction.

3. The leak testing device for oil-immersed transformers according to claim 2, characterized in that, For any clamping mechanism, the clamping mechanism further comprises a moving seat in transmission connection with the rigid transmission member, the elastic buffer mechanism comprises a clamping member for direct contact with the oil-immersed transformer, and the elastic member is arranged between the clamping member and the moving seat.

4. The leak testing device for oil immersed transformers according to claim 3, characterized in that, For any clamping mechanism, a guide hole is arranged on the moving seat, the axial direction of the guide hole is the same as the moving direction of the moving seat, a guide rod is arranged on the clamping member in guide cooperation with the guide hole, and the elastic member is a compression spring sleeved on the guide rod.

5. The leak testing device for oil immersed transformers according to claim 1 or 2, characterized in that, A through hole is arranged on the support and penetrates the support along the up-down direction, and a slide rail is arranged on the hole wall of the through hole; for any clamping mechanism, the clamping mechanism comprises a moving seat in transmission connection with the rigid transmission member, and the moving seat is guided and slidably connected with the support through the slide rail.

6. The leak testing device for oil-immersed transformers according to any one of claims 1 to 4, characterized in that, The hinged end of each rigid transmission member to the output end is located on the same circumference.

7. The leak detection device for oil-immersed transformers according to any one of claims 1 to 4, characterized in that, The direct-acting driving mechanism comprises a driving disc, a screw rod and a driving motor, the screw rod extends along the up-down direction, a threaded hole is arranged on the driving disc in screw cooperation with the screw rod, the driving motor is used to drive the screw rod to rotate, so as to control the up-down movement of the driving disc, and the driving disc constitutes the output end.

8. The leak testing device for oil immersed transformers according to claim 7, characterized in that, A worm wheel is fixedly connected to the screw rod, the axis of the worm wheel coincides with the axis of the screw rod, a driving motor is in transmission connection with a worm, and the worm is in transmission cooperation with the worm wheel.

9. The leak detection device for oil-immersed transformers according to any one of claims 1 to 4, characterized in that, An oil pump is mounted on the support, and the oil pump is provided with an oil delivery pipe connected with the oil inlet pipe of the oil-immersed transformer leak detection device.

10. The leak detection device for oil immersed transformers according to claim 9, characterized in that, A pressure sensor is mounted on the oil delivery pipe and used to detect the oil pressure in the oil delivery pipe.

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