Oil drain connector of an oil-immersed transformer and transformer thereof

Abstract

The application relates to the technical field of transformer parts, and discloses a draining joint of an oil-immersed transformer and a transformer thereof, which comprises a mounting frame, an oil control part is arranged on the mounting frame, the oil control part comprises an oil pillow, one end of the oil pillow is provided with an oil separation disc in a connecting mode, a butt joint ring is fixedly connected to the oil pillow, an oil feeding pipe is communicated with the oil pillow, an oil outlet part is arranged on the oil separation disc, the oil outlet part comprises an oil outlet pipe, the oil outlet pipe is communicated with and mounted on the oil separation disc, a slope sleeve disc is sleeved on the oil outlet pipe, a sealing part is arranged on the butt joint ring, the sealing part comprises a sealing disc, the draining joint and the oil-immersed transformer, the rotatable oil outlet pipe head and components thereof, a series of mechanical linkages are used to realize the oil draining function, the draining joint can be repeatedly used, compared with the prior art emergency draining joint which uses the mode of breaking glass to quickly drain oil, the mode that the draining joint cannot be recycled is avoided, the rotatable oil outlet pipe head avoids frequent replacement of the joint, and the maintenance cost is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of transformer components, in particular to an oil drain joint of an oil-immersed transformer and the transformer thereof. Background Art

[0002] Oil-immersed transformers are widely used in power systems, using insulating oil to dissipate heat and provide insulation. During transformer operation and maintenance, regular replacement of the insulating oil is crucial to ensuring proper operation. This requires the use of an oil drain connector to facilitate both the discharge and refilling of the oil.

[0003] According to the Chinese patent announcement number CN216133733U, the patent relates to an oil drain joint of a transformer and a transformer, including an oil pipe, a cover plate and a glass seal. One end of the oil pipe has a first flange, and the other end of the oil pipe is used to connect to the oil tank of the transformer. The cover plate is annular and is coaxially mounted on the first flange. The glass seal is clamped between the first flange and the cover plate, and the glass seal can cover the pipe opening of the oil pipe and the inner circle of the cover plate. By breaking the glass seal within the inner circle of the cover plate, the pipe opening of the oil pipe and the inner circle of the cover plate can be connected. The annular cover plate cooperates with the first flange on the oil pipe to clamp a glass seal to seal the pipe opening of the oil pipe. The cover plate can provide sufficient support strength to ensure sealing. When the oil is drained in an emergency, the glass seal can be broken to achieve rapid oil draining.

[0004] The oil level in a transformer fluctuates depending on the ambient temperature and its own heat generation. In hot seasons, high ambient temperatures can reduce the transformer's heat dissipation efficiency, causing the oil level to rise rapidly. This can create a safety hazard, potentially exceeding the critical point, requiring timely oil draining. The emergency oil drain connector in the aforementioned patent uses broken glass to quickly drain the oil, making it impossible to recycle the connector, increasing costs. After draining, the connector also needs to be replaced, reducing maintenance efficiency. Therefore, an oil drain connector for an oil-immersed transformer and a transformer thereof are proposed to address the aforementioned issues. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the deficiencies in the prior art, the present invention provides an oil drain connector for an oil-immersed transformer and a transformer thereof, which solves the problem that high ambient temperature may reduce the heat dissipation efficiency of the transformer, thereby causing the oil level to rise rapidly and resulting in a safety hazard of the oil level being higher than the critical point.

[0007] (2) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an oil drain joint of an oil-immersed transformer, comprising a mounting frame, an oil control part is provided on the mounting frame, the oil control part comprises an oil pillow, one end of the oil pillow is opened and connected to an oil separator, a docking ring is fixedly connected to the oil pillow, an upper oil pipe is connected to the oil pillow, an oil outlet part is provided on the oil separator, the oil outlet part comprises an oil outlet pipe, the oil outlet pipe is connected and installed on the oil separator, a slot is connected on the oil outlet pipe, a slope sleeve disc is sleeved on the oil outlet pipe, a sealing part is provided on the docking ring, the sealing part comprises a sealing disc, the sealing disc is inserted in the oil pillow and installed on the docking ring, a steering hole and a ring groove are provided on the sealing disc, an emergency part is provided on the sealing disc, the emergency part comprises a transparent cover, a rotating edge is connected to the transparent cover, the rotating edge is rotatably connected in the ring groove, an oil drain pipe head is connected and installed on the transparent cover, and an oil inlet pipe is slidably connected in the steering hole.

[0009] Preferably, an oil level detector is installed on the oil pillow, an oil filling port is installed on the oil pillow, a clamp is hinged on the oil pillow, an oil return pipe is installed on the oil pillow, the end of the oil return pipe is bent and extended and fixedly connected to the upper oil pipe, the oil return pipe is connected to the upper oil pipe, and a one-way valve is installed on the oil return pipe.

[0010] Preferably, there are two oil outlet parts, and the oil outlet pipes in the two oil outlet parts are connected to the oil pillow through the oil separator, and a central hole is opened on the sealing plate.

[0011] Preferably, the oil inlet pipe 1 is fixedly connected to the transparent cover and is connected thereto, the oil inlet pipe 1 extends into the oil pillow and is provided with an oil inlet pipe 2, a chuck is installed on the oil inlet pipe 2, the oil inlet pipe 2 is plugged into the card slot through the chuck, the oil inlet pipe 2 is connected to the oil outlet pipe through the chuck, a pipe cover is installed on the oil drain pipe head, the oil drain pipe head is clamped in the clamp, a sliding disk is fixedly sleeved on the oil inlet pipe 1, the oil inlet pipe 1 is slidably connected to the oil inlet pipe 2 through the sliding disk, and a tension spring is elastically connected between the sliding disk and the oil inlet pipe 2.

[0012] Preferably, a driving part is provided on the transparent cover, and the driving part includes a driving rod. The driving rod is fixed and passes through both sides of the transparent cover. The driving rod is rotatably connected in the middle hole and extends into the oil pillow. A slot is provided on the driving rod and a handwheel is installed.

[0013] Preferably, the oil separator is rotatably connected to a rotating shaft 1, the rotating shaft 1 is fixedly connected to an insert block, the insert block is plugged into a slot, and the rotating shaft 1 is also fixedly sleeved with a gear 1.

[0014] Preferably, a switching part is provided on the oil pillow, and the switching part includes a second rotating shaft, and the second rotating shaft is rotatably connected to the oil separator, and a fixed sleeve on the second rotating shaft is provided with a second gear, and a sliding box is installed on the oil pillow, and a sliding hole is opened on the oil pillow, and a limiting rod is fixedly connected inside the oil pillow, and a sliding sleeve on the limiting rod is provided with an L-shaped tooth arm, and the L-shaped tooth arm is engaged with the second gear, and an L-shaped support arm is fixedly connected to the L-shaped tooth arm, and a sealing plate is fixedly connected to the L-shaped tooth arm, and the L-shaped tooth arm and the L-shaped support arm are slidably connected in the slide box through the sliding hole.

[0015] Preferably, there are two switching parts, and the two switching parts are symmetrically arranged with respect to each other.

[0016] Preferably, the two gears 2 in the two switching parts are engaged with gear 1, and the two sealing plates in the two switching parts are horizontally aligned with the two slots in the two oil outlet parts, respectively, one of the sealing plates is away from the chuck, and the other sealing plate is inserted into the inner wall of the slot, the outer wall of the chuck is a slope structure, and the slope angle of the chuck is the same as the slope angle of the two slope sleeve discs.

[0017] An oil-immersed transformer comprises a transformer body, an oil drain valve is installed on the chassis of the transformer body, the oil pillow is installed on a mounting frame, the mounting frame is installed on the chassis of the transformer body, and the upper oil pipe is connected and installed on the chassis of the transformer body.

[0018] (3) Beneficial effects

[0019] Compared with the prior art, the present invention provides an oil drain connector for an oil-immersed transformer and a transformer thereof, which has the following beneficial effects:

[0020] 1. The oil drain connector of the oil-immersed transformer and the transformer thereof adopt the oil drain connector and the oil-immersed transformer, the rotatable oil drain pipe head and its components, realize the oil draining function through a series of mechanical linkages, and are reusable. Compared with the emergency oil drain connector in the prior art that uses the method of breaking glass to quickly drain the oil, which makes the oil drain connector unable to be recycled, the rotatable oil drain pipe head avoids frequent replacement of connectors, effectively reducing maintenance costs.

[0021] 2. The oil drain connector of the oil-immersed transformer and its transformer use an oil level detector to monitor the oil level of the oil conservator in real time. In conjunction with the emergency unit, drive unit and switching unit, when the oil level is too high due to high temperature, the oil drain operation can be quickly realized and the oil outlet part can be automatically switched on and off. There is no need to replace the connector as cumbersome as in the existing technology, which greatly improves maintenance efficiency.

[0022] 3. The oil drain connector of the oil-immersed transformer and its transformer adopt automatic lubrication to ensure the stability of components. During the on-off switching process of the oil outlet part, the oil leaked from the oil outlet pipe will spill onto components such as gears, providing automatic lubrication for these components, reducing component wear, ensuring their stability in use, and extending their service life.

[0023] 4. The oil drain joint of the oil-immersed transformer and its transformer are connected to the upper oil pipe with an oil return pipe, and a one-way valve is installed at the bent end, which can replenish the oil leaked when the oil outlet is switched into the oil pillow, avoiding oil loss, ensuring the stability of the oil volume inside the transformer, and maintaining normal insulation and heat dissipation functions.

[0024] 5. The oil drain connector of the oil-immersed transformer and its transformer use a transparent cover made of transparent material from the emergency department, which makes it easy to observe the oil flow. Combined with the monitoring data of the oil level detector, it can more reasonably judge the safety of oil use, discover potential problems in time and take measures.

[0025] 6. The oil drain connector of the oil-immersed transformer and the transformer thereof adopt a sloped outer wall structure of the chuck at both ends of the oil inlet pipe, which has the same slope angle as the slope sleeve. When the chuck is inserted into the slot, the slope fits tightly and can effectively press against the oil outlet pipe, ensuring the sealing of the oil when it is connected and preventing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of an oil drain connector for an oil-immersed transformer and the overall structure of the transformer proposed by the present invention;

[0027] Figure 2 This is a schematic diagram of the oil drain connector of an oil-immersed transformer and the other side of the transformer as a whole, as proposed by the present invention;

[0028] Figure 3 This is a schematic structural diagram of an oil drain connector for an oil-immersed transformer and its transformer oil control unit proposed by the present invention;

[0029] Figure 4 This is a schematic diagram of the internal structure of an oil drain connector of an oil-immersed transformer and its transformer oil conservator proposed by the present invention;

[0030] Figure 5 This is a schematic structural diagram of an oil drain connector of an oil-immersed transformer and a transformer switching part thereof proposed by the present invention;

[0031] Figure 6 This is a schematic diagram of the oil drain connector of an oil-immersed transformer and its L-shaped tooth arm structure proposed by the present invention;

[0032] Figure 7 This is a schematic structural diagram of an oil drain connector for an oil-immersed transformer and its transformer sealing and emergency parts proposed by the present invention;

[0033] Figure 8 This is a schematic structural diagram of an oil drain connector for an oil-immersed transformer and its transformer sealing portion proposed by the present invention;

[0034] Figure 9 This is a diagram showing the connection between the oil drain connector of an oil-immersed transformer and its emergency and drive parts.

[0035] Figure 10 This is an exploded view of an oil drain connector of an oil-immersed transformer and its first and second oil inlet pipes;

[0036] Figure 11 This is a connection diagram of an oil drain connector for an oil-immersed transformer and its transformer chuck and slot proposed by the present invention.

[0037] Figure: 1. Mounting frame; 2. Transformer body; 3. Oil control unit; 31. Oil pillow; 32. Oil level detector; 33. Oil separator; 34. Docking ring; 35. Oil return pipe; 36. Upper oil pipe; 37. Check valve; 38. Clamp; 4. Oil outlet; 41. Oil outlet pipe; 42. Clamping groove; 43. Slope sleeve; 5. Sealing unit; 51. Sealing disc; 52. Steering hole; 53. Center hole; 54. Ring groove; 6. Emergency unit; 61. Transparent cover; 62. Turning edge; 63 , oil drain pipe head; 64, pipe cover; 65, oil inlet pipe 1; 66, slide plate; 67, oil inlet pipe 2; 68, tension spring; 69, chuck; 7, driving unit; 71, driving rod; 72, slot; 73, handwheel; 74, rotating shaft 1; 75, insert; 76, gear 1; 8, switching unit; 81, rotating shaft 2; 82, gear 2; 83, slide box; 84, sliding hole; 85, limit rod; 86, L-shaped gear arm; 87, L-shaped support arm; 88, sealing plate; 9, oil drain valve. DETAILED DESCRIPTION

[0038] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] See also Figure 1-11The present invention provides a technical solution: an oil drain joint of an oil-immersed transformer, comprising a mounting frame 1, on which an oil control part 3 is provided, the oil control part 3 including an oil pillow 31, one end of the oil pillow 31 is opened and connected to an oil separator 33, a docking ring 34 is fixedly connected to the oil pillow 31, an upper oil pipe 36 is communicated with the oil pillow 31, an oil level detector 32 is installed on the oil pillow 31, which monitors the oil level of the oil pillow 31 during normal operation, and an oil filling port is connected and installed on the oil pillow 31, which is used for refueling and leak repairing during normal use, a clamp 38 is hinged on the oil pillow 31, an oil return pipe 35 is connected and installed on the oil pillow 31, the end of the oil return pipe 35 is bent and extended and fixedly connected to the upper oil pipe 36, the oil return pipe 35 is communicated with the upper oil pipe 36, a one-way valve 37 is installed on the oil return pipe 35, and the oil return pipe 35 collects the oil overflowing into the opening of the oil pillow 31 and returns it to replenish the oil pillow 31.

[0040] In the present invention, an oil outlet portion 4 is provided on the oil separator 33 for emergency outflow of oil under thermal expansion. The oil outlet portion 4 includes an oil outlet pipe 41, which is connected and installed on the oil separator 33. A slot 42 is connected to the oil outlet pipe 41, and a slope sleeve 43 is sleeved on the oil outlet pipe 41. A sealing portion 5 is provided on the docking ring 34. The sealing portion 5 includes a sealing disk 51, which is inserted into the oil pillow 31 and installed on the docking ring 34. A steering hole 52 and an annular groove 54 are provided on the sealing disk 51. There are two oil outlet portions 4. The oil outlet pipes 41 in the two oil outlet portions 4 are connected to the oil pillow 31 through the oil separator 33, and a center hole 53 is provided on the sealing disk 51.

[0041] In this embodiment, an emergency portion 6 is provided on the sealing disk 51 for emergency discharge of oil under thermal expansion. The emergency portion 6 includes a transparent cover 61. The transparent material makes it easy to observe the flow of oil. The transparent cover 61 is connected to a rotating edge 62, which is rotatably connected to the annular groove 54. The transparent cover 61 is connected to an oil drain pipe head 63. An oil inlet pipe 1 65 is slidably connected to the steering hole 52. The oil inlet pipe 1 65 is fixedly connected to the transparent cover 61 and is connected in communication. The oil inlet pipe 1 65 extends into the oil pillow 31 and is provided with an oil inlet pipe 2 67. A chuck 69 is installed on the oil inlet pipe 2 67. The second oil inlet pipe 67 is inserted into the card slot 42 through the chuck 69, and the second oil inlet pipe 67 is connected to the oil outlet pipe 41 through the chuck 69. A pipe cover 64 is installed on the oil drain pipe head 63, and the oil drain pipe head 63 is clamped in the clamp 38. The clamp 38 limits the oil drain pipe head 63 to prevent free flipping. A sliding plate 66 is fixed on the oil inlet pipe 1 65, and the oil inlet pipe 1 65 is slidably connected to the oil inlet pipe 2 67 through the sliding plate 66. A tension spring 68 is elastically connected between the sliding plate 66 and the oil inlet pipe 2 67. The oil inlet pipe 2 67 can elastically slide on the oil inlet pipe 1 65 and maintain a seal without oil leakage.

[0042] It is worth noting that a driving part 7 is provided on the transparent cover 61, and the driving part 7 includes a driving rod 71. The driving rod 71 is fixed through both sides of the transparent cover 61, and the driving rod 71 is rotatably connected in the middle hole 53 and extends into the oil pillow 31. A slot 72 is provided on the driving rod 71 and a handwheel 73 is installed. A rotating shaft 74 is rotatably connected to the oil separator 33, and an insert block 75 is fixedly connected to the rotating shaft 74. The insert block 75 is plugged into the slot 72, and a gear 76 is also fixedly sleeved on the rotating shaft 74.

[0043] It is worth noting that a switching portion 8 is provided on the oil pillow 31, and the switching portion 8 includes a second rotating shaft 81, which is rotatably connected to the oil separator 33, and a fixed sleeve is provided with a second gear 82 on the second rotating shaft 81. A slide box 83 is installed on the oil pillow 31, and a sliding hole 84 is opened on the oil pillow 31. A limit rod 85 is fixedly connected to the oil pillow 31, and a sliding sleeve is provided on the limit rod 85. An L-shaped tooth arm 86 is provided on the limit rod 85. The limit rod 85 ensures the stability of the movement of the L-shaped tooth arm 86 and provides force support. The L-shaped tooth arm 86 is engaged with the second gear 82, and an L-shaped support arm 87 is fixedly connected to the L-shaped support arm 87. There is a sealing sheet 88, and the L-shaped tooth arm 86 and the L-shaped support arm 87 are slidably connected in the slide box 83 through the sliding hole 84. There are two switching parts 8, and the two switching parts 8 are symmetrically arranged. The two gear twos 82 in the two switching parts 8 are engaged with the gear one 76. The two sealing sheets 88 in the two switching parts 8 are horizontally aligned with the two card grooves 42 in the two oil outlet parts 4 respectively. One of the sealing sheets 88 is away from the chuck 69, and the other sealing sheet 88 is inserted into the inner wall of the card groove 42. The outer wall of the chuck 69 is a slope structure, and the slope angle of the chuck 69 is the same as the slope angle of the two slope sleeves 43.

[0044] An oil-immersed transformer includes a transformer body 2. An oil drain valve 9 is installed on the chassis of the transformer body 2. The oil drain valve 9 on the chassis of the transformer body 2 is used for routine oil draining maintenance. During normal operation, oil circulates between the transformer body 2 and an oil pillow 31. The oil pillow 31 is installed on a mounting frame 1, and the mounting frame 1 is installed on the chassis of the transformer body 2. An upper oil pipe 36 is connected and installed on the chassis of the transformer body 2.

[0045] Working principle: When the high temperature environment causes the insulating oil in the oil pillow 31 to expand due to heat and exceed the threshold line, the insulating oil will enter the oil outlet pipe 41 on the oil separator 33, and the oil will enter the oil inlet pipe 2 67 and the oil inlet pipe 1 65 along the oil outlet pipe 41 and then flow into the transparent cover 61. The safety of the oil can be more reasonably judged by the monitoring of the oil level detector 32 and the oil level in the transparent cover 61, and the clamp 38 is flipped open to release the oil drain pipe head 63.

[0046] The drive rod 71 is driven to rotate by the handwheel 73, and the slot 72 drives the rotating shaft 74 to rotate through the plug block 75, prompting the gear 1 76 to rotate accordingly, and the oil drain pipe head 63 rotates to face downward and open the pipe cover 64. The oil inlet pipe 1 65 drives the oil inlet pipe 2 67 to rotate, and drives the chuck 69 to disengage from the slot 42. The chuck 69 moves in a curve to the oil outlet pipe 41 below. The slope of the chuck 69 fits the slope of the slope sleeve 43 and moves, squeezing the tension spring 68. After the chuck 69 is stuck in the slot 42 below, the chuck 69 is prompted to press against the oil outlet pipe 41 to ensure the sealing of the connection. When the chuck 69 is subjected to thermal expansion and contraction, the tension spring 68 can adaptively compensate for the resistance force to further improve the sealing. At this time, the oil in the oil pillow 31 will flow into the transparent cover 61 along the oil outlet pipe 41, and the oil overflowed by thermal expansion will be discharged urgently to restore it to the safe oil level line in the oil pillow 31.

[0047] After the oil drain pipe head 63 rotates from top to bottom, gear 1 76 drives the two gears 2 82 to rotate synchronously, and drives the L-shaped support arm 87 to move horizontally through the L-shaped tooth arm 86, and moves along the sliding hole 84 in the sliding box 83, prompting the sealing piece 88 originally located at the bottom to move away from the lower groove 42, making room for the connection of the chuck 69, and the sealing piece 88 originally located at the top is inserted into the upper groove 42, blocking the upper oil outlet pipe 41 to prevent continuous oil leakage, thereby realizing automatic on-off switching of the oil outlet part 4.

[0048] During the on-off switching period, the oil leaked from the oil outlet pipe 41 will flow into the space between the oil separator 33 and the sealing plate 51 in the oil pillow 31, and then be replenished to the upper oil pipe 36 through the return oil pipe 35 to avoid the loss of oil in the oil pillow 31. The one-way valve 37 ensures the stability of the one-way flow of the insulating oil and avoids backflow. In addition, the oil leaked from the oil outlet pipe 41 will be sprinkled on the gear 76 and other components, providing automatic lubrication effect for these components, thereby ensuring the stability of these components in use.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

Claims

1. An oil drain connector for an oil-immersed transformer, comprising a mounting frame (1), characterized in that: An oil control portion (3) is provided on the mounting frame (1), and the oil control portion (3) includes an oil pillow (31). One end of the oil pillow (31) is open and connected to an oil separator (33). A docking ring (34) is fixedly connected to the oil pillow (31), and an upper oil pipe (36) is connected to the oil pillow (31). An oil outlet portion (4) is provided on the oil separator (33), and the oil outlet portion (4) includes an oil outlet pipe (41). The oil outlet pipe (41) is connected to and mounted on the oil separator (33), a clamping groove (42) is connected to the oil outlet pipe (41), and a sloped sleeve disc (43) is sleeved on the oil outlet pipe (41); A sealing portion (5) is provided on the docking ring (34), and the sealing portion (5) includes a sealing disc (51). The sealing disc (51) is inserted into the oil pillow (31) and installed on the docking ring (34). A steering hole (52) and an annular groove (54) are provided on the sealing disc (51); An emergency part (6) is provided on the sealing disc (51), and the emergency part (6) includes a transparent cover (61). A rotating edge (62) is connected to the transparent cover (61), and the rotating edge (62) is rotatably connected in the annular groove (54). An oil drain pipe head (63) is connected and installed on the transparent cover (61), and an oil inlet pipe (65) is slidably connected in the steering hole (52).

2. The oil drain connector for an oil-immersed transformer according to claim 1, characterized in that: An oil level detector (32) is installed on the oil pillow (31), an oil filling port is connected to the oil pillow (31), a clamp (38) is hinged on the oil pillow (31), an oil return pipe (35) is connected to the oil pillow (31), an end of the oil return pipe (35) is bent and extended and fixedly connected to the upper oil pipe (36), the oil return pipe (35) is connected to the upper oil pipe (36), and a one-way valve (37) is installed on the oil return pipe (35).

3. The oil drain connector for an oil-immersed transformer according to claim 2, characterized in that: There are two oil outlet parts (4), and the oil outlet pipes (41) in the two oil outlet parts (4) are both connected to the oil pillow (31) through the oil separator (33). The sealing plate (51) is provided with a central hole (53).

4. The oil drain connector for an oil-immersed transformer according to claim 3, characterized in that: The oil inlet pipe 1 (65) is fixedly connected to the transparent cover (61) and is connected thereto. The oil inlet pipe 1 (65) extends into the oil pillow (31) and is provided with an oil inlet pipe 2 (67). A chuck (69) is installed on the oil inlet pipe 2 (67). The oil inlet pipe 2 (67) is plugged into the card slot (42) through the chuck (69). The oil inlet pipe 2 (67) is connected to the oil outlet pipe (41) through the chuck (69). A pipe cover (64) is installed on the oil drain pipe head (63). The oil drain pipe head (63) is clamped in the clamp (38). A sliding disc (66) is fixedly sleeved on the oil inlet pipe 1 (65). The oil inlet pipe 1 (65) is slidably connected to the oil inlet pipe 2 (67) through the sliding disc (66). A tension spring (68) is elastically connected between the sliding disc (66) and the oil inlet pipe 2 (67).

5. The oil drain connector for an oil-immersed transformer according to claim 4, characterized in that: The transparent cover (61) is provided with a driving portion (7), and the driving portion (7) includes a driving rod (71). The driving rod (71) is fixedly passed through both sides of the transparent cover (61), and the driving rod (71) is rotatably connected in the middle hole (53) and extends into the oil pillow (31). The driving rod (71) is provided with a slot (72) and is equipped with a hand wheel (73).

6. The oil drain connector for an oil-immersed transformer according to claim 5, characterized in that: The oil separator (33) is rotatably connected to a rotating shaft (74), and an insert block (75) is fixedly connected to the rotating shaft (74). The insert block (75) is plugged into the slot (72), and a gear (76) is fixedly sleeved on the rotating shaft (74).

7. The oil drain connector for an oil-immersed transformer according to claim 6, characterized in that: The oil pillow (31) is provided with a switching part (8), and the switching part (8) includes a second rotating shaft (81), the second rotating shaft (81) is rotatably connected to the oil separator (33), the second rotating shaft (81) is fixedly sleeved with a second gear (82), a slide box (83) is installed on the oil pillow (31), a sliding hole (84) is opened on the oil pillow (31), a limiting rod (85) is fixedly connected inside the oil pillow (31), the limiting rod (85) is slidingly sleeved with an L-shaped tooth arm (86), the L-shaped tooth arm (86) is meshed with the second gear (82), the L-shaped tooth arm (86) is fixedly connected to an L-shaped support arm (87), the L-shaped support arm (87) is fixedly connected to a sealing plate (88), and the L-shaped tooth arm (86) and the L-shaped support arm (87) are slidably connected in the slide box (83) through the sliding hole (84).

8. The oil drain connector for an oil-immersed transformer according to claim 7, characterized in that: There are two switching parts (8), and the two switching parts (8) are arranged symmetrically with each other.

9. The oil drain connector for an oil-immersed transformer according to claim 8, characterized in that: The two gears 2 (82) in the two switching parts (8) are both engaged with the gear 1 (76), and the two sealing sheets (88) in the two switching parts (8) are respectively arranged to be horizontally aligned with the two grooves (42) in the two oil outlet parts (4), one of the sealing sheets (88) is away from the chuck (69), and the other sealing sheet (88) is inserted into the inner wall of the groove (42), and the outer wall of the chuck (69) is a slope structure, and the slope angle of the chuck (69) is the same as the slope angle of the two slope sleeves (43).

10. An oil-immersed transformer, the oil drain connector of an oil-immersed transformer according to claim 9, characterized in that: The invention comprises a transformer body (2), an oil drain valve (9) is installed on the chassis of the transformer body (2), the oil pillow (31) is installed on the mounting frame (1), the mounting frame (1) is installed on the chassis of the transformer body (2), and the upper oil pipe (36) is connected and installed on the chassis of the transformer body (2).

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