A transformer oil waste oil recovery device

Abstract

The present invention relates to a waste transformer oil recovery device, which includes a recovery tank and a recovery pump connected by a connecting pipe. The input end of the recovery tank is connected to the drain pipe of the transformer through the connecting pipe and an adapter; the adapter includes an outer pipe, with an inner pipe inserted at one end and a sealing sleeve detachably connected at the other end. The outer side end of the inner pipe is communicated with the connecting pipe leading to the recovery tank, and the sealing sleeve is hermetically sleeved on the drain pipe through a tightening member. In the assembled state, a closed oil return chamber is formed inside the outer pipe, the inner pipe and the sealing sleeve; one end of the inner pipe is provided with a flange, and the flange is provided with an axially protruding clamping end. The inner pipe is provided with a return hole on the radially outer periphery of the clamping end, and the end of the inner pipe away from the clamping end is a knob end located outside the outer pipe. The present invention is beneficial to solving the problems that the connection structure between some existing waste oil recovery devices and transformers is inconvenient, and there is still a large area of oil dripping pollution after the removal of the recovery device.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer equipment maintenance, and particularly to a waste transformer oil recovery device. Background Art

[0002] Transformer oil, also known as insulating oil, is a liquid insulating material specifically used for power transformers and other high-voltage equipment. Its main functions include insulation, cooling, and arc extinction. Transformer oil plays a crucial role in transformers, ensuring the normal operation of equipment and extending its service life. Recycling the transformer oil in transformers can enable circular reuse, save usage costs, and avoid environmental pollution.

[0003] After a scrapped transformer is recycled, it is generally necessary to drain the transformer oil in the oil chamber and recover the transformer oil. Chinese Patent CN202310840648.9 discloses a transformer oil recovery device applied to a transformer, aiming to provide a transformer oil recovery device that is not only convenient for transformer oil recovery operations but also can effectively solve the problems of transformer oil spraying and splashing during the transformer oil recovery process, resulting in the pollution of the ground and the work clothes of operators and causing waste of transformer oil. It includes: an outer sleeve, a sealing gasket is provided on one end face of the outer sleeve, a connecting shaft hole is provided at the other end of the outer sleeve, and an oil pipe interface is provided on the side surface of the outer sleeve; a rotary disassembly rod, the rotary disassembly rod is rotatably arranged in the connecting shaft hole, and the rotary disassembly rod is rotatably and hermetically connected to the connecting shaft hole, and a polygonal inner hole is provided on the inner end face of the rotary disassembly rod; an outer sleeve fixer, the outer sleeve fixer fixes the outer sleeve on the outer side wall of the transformer and makes the sealing gasket closely abut against the outer side wall of the transformer; a recovery tank, the recovery tank is connected to the oil pipe interface through a connecting pipe.

[0004] In the above technical solution during the recovery process, it is necessary to use an outer sleeve fixer to fix the open end of the outer sleeve on the outer side wall of the transformer. In this way, first, the outer sleeve fixer needs to be wound around the transformer, and it is easy to slip and shift on the side away from the drain pipe during the tightening process, resulting in poor control of the fixing effect and great difficulty in single-person operation. Second, the outer sleeve directly abuts against the outer wall of the transformer, and its inner area will be filled with transformer oil during the waste oil recovery process, resulting in the adhesion of transformer oil to the entire drain pipe and part of the outer wall of the transformer, with a large oil adhesion area. There will still be a situation of dripping oil polluting the on-site environment after disassembly. Summary of the Invention

[0005] The present invention provides a waste transformer oil recovery device, which is conducive to solving the problems that the connection structure between some existing waste oil recovery devices and transformers is not convenient, and there is still a large area of dripping oil pollution after the recovery device is removed.

[0006] The present invention is implemented as follows:

[0007] A waste transformer oil recovery device includes a recovery tank and a recovery pump connected by a connecting pipe. The input end of the recovery tank is connected to the drain pipe of the transformer through the connecting pipe and an adapter. The adapter includes an outer pipe. One end of the outer pipe is inserted with an inner pipe, and the other end is detachably connected with a sealing sleeve. The outer side end of the inner pipe is communicated with the connecting pipe leading to the recovery tank. The sealing sleeve is sleeved on the drain pipe through a tightening member. In the assembled state, a communicating closed oil return chamber is formed inside the outer pipe, the inner pipe and the sealing sleeve. One end of the inner pipe extending into the outer pipe is provided with a radially protruding flange. There is a sealing and limiting structure between the flange and the axially open end of the outer pipe. The radially inner side of the flange is provided with an axially protruding clamping end. The clamping end has a clamping groove adapted to the outer contour of the sealing bolt at the end of the drain pipe. The inner pipe is provided with a return hole around the radial periphery of the clamping end. The return hole constitutes a communicating structure between the inner cavities of the outer pipe and the inner pipe. One end of the inner pipe away from the clamping end is a knob end located outside the outer pipe. The radially inner side of the knob end is connected with a plug through a sealing bearing. A recovery oil pipe communicating with the inner cavity of the inner pipe is connected to the plug. The recovery oil pipe is communicated with the connecting pipe leading to the recovery tank.

[0008] On the basis of the above technical solution, the return hole is composed of a plurality of arc-shaped through holes.

[0009] On the basis of the above technical solution, the clamping end is of a similar n-shaped structure, and the clamping groove is of an open groove structure.

[0010] On the basis of the above technical solution, the axial two sides of the flange relative to the inner pipe are provided with a first extension part and a second extension part. The first extension part is on the same side as the clamping end, and the outer side surface of the first extension part is an arc-shaped curved surface.

[0011] On the basis of the above technical solution, the second extension part is of an L-shaped structure, and a bushing is arranged at its slot. The outer contour of the bushing is aligned with the outer contour of the flange.

[0012] On the basis of the above technical solution, the axially outer end of the knob end is provided with a rotating handle, and the axially inner end is provided with a radially protruding rotating insertion post.

[0013] On the basis of the above technical solution, the connection end of the outer pipe and the sealing sleeve is provided with a threaded ring for detachable threaded connection. One end of the sealing sleeve is hermetically clamped in the connection gap between the threaded ring and the outer pipe.

[0014] On the basis of the above technical solution, the sealing sleeve is made of an elastic material. A shaping cavity is arranged inside the sealing sleeve at the connection with the tightening member. A shaping member capable of bending and deforming is arranged inside the shaping cavity. A filler is arranged in the shaping cavity. After the tightening member is tightened, the shaping member and the filler can be closely packed inside the connection between the tightening member and the drain pipe to form a sealing filling structure.

[0015] Compared with the prior art, the present invention has at least the following advantages:

[0016] 1. The waste transformer oil recovery device of the present invention realizes quick and stable connection with the transformer drain pipe through a unique adapter design. The clamping method of the clamping end and the sealing bolt at the end of the drain pipe is simple and easy to operate, without complex fixing operations. A single person can easily complete the connection, greatly reducing the operation difficulty and working intensity. The connection of the entire adapter only requires sleeving the sealing sleeve on the drain pipe and fixing it by a tightening member. This connection method is not limited by the shape and size of the transformer main body and has wide applicability.

[0017] 2. After the removal of the recovery device, the problem of large-area oil dripping pollution existing in the prior art is effectively solved. By optimizing the structural design of the adapter, the contact area between the transformer oil and the outer wall of the transformer is reduced, and the amount of adhered oil is decreased. At the same time, the unique design of the sealing sleeve and the closed oil return chamber formed inside the outer pipe, inner pipe and sealing sleeve ensure the sealing performance of the transformer oil during the recovery process and prevent leakage. Even if there is a small amount of transformer oil residue, the adhesion area is greatly reduced, reducing the possibility of oil dripping pollution and the subsequent cleaning workload and the environmental pollution risk.

[0018] 3. The optimized design of the return hole enables the transformer oil to flow into the recovery tank more smoothly, reducing the flow resistance and improving the recovery efficiency. At the same time, the setting of components such as the sealing limit structure and the sealing bearing ensures the sealing performance during the recovery process, prevents the leakage of transformer oil, and improves the recovery quality. In addition, the operator can precisely control the recovery process by rotating the knob end, further enhancing the stability and reliability of the recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a schematic diagram of the overall structure of the waste transformer oil recovery device in an embodiment;

[0021] Figure 2 is Figure 1 the structural schematic diagram of the adapter in

[0022] Figure 3 is Figure 1 the partial cross-sectional view of the adapter in the assembled state;

[0023] Figure 4 is Figure 2 a schematic structural view of the inner tube;

[0024] Figure 5 is Figure 4 a sectional view of;

[0025] Figure 6 is Figure 3 a partially enlarged view of A in;

[0026] Figure 7 is Figure 3 a partially enlarged view of B in;

[0027] Figure 8 a schematic structural view of the shaping cavity in an embodiment.

[0028] Reference numerals in the figure: 100, adapter; 110, outer tube; 1101, first inner cavity; 111, limiting flange; 112, threaded ring; 120, inner tube; 1201, second inner cavity; 121, flange; 1211, first extension; 1212, second extension; 122, clamping end; 1221, clamping groove; 123, return hole; 124, knob end; 1241, handle; 1242, rotary insertion post; 125, bushing; 130, sealing sleeve; 1301, third inner cavity; 131, shaping cavity; 132, shaping part; 133, filler; 140, tightening part; 150, plug; 151, oil outlet through hole; 160, sealed bearing; 170, recovery oil pipe; 200, recovery tank; 300, recovery pump; 400, connecting pipe; 500, transformer; 510, drain pipe; 520, sealing bolt. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention.

[0030] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to an element or there may be intermediate elements present simultaneously. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Embodiment 1: With reference to Figures 1-7 As shown, this embodiment discloses a transformer oil waste oil recovery device, aiming to solve the problems that the connection structure between the existing waste oil recovery device and the transformer is not convenient, and there is still a large area of oil dripping pollution after the recovery device is removed. By optimizing the structural design of the recovery device, the connection convenience and stability with the transformer are improved, the oil dripping phenomenon during the recovery process is reduced, the environmental pollution risk is lowered, and the overall efficiency and quality of the transformer oil waste oil recovery are enhanced.

[0034] The recovery device specifically includes a coupler, a connecting pipe 400, a recovery tank 200 and a recovery pump 300. Among them, the recovery tank 200 serves as the storage structure for the recovery of transformer oil. The recovery pump 300 is an external air pump, which is connected to the top of the recovery tank 200 through the connecting pipe 400 and is used to discharge the air in the recovery tank 200 according to the threshold parameters during the recovery process, so that a negative pressure state conducive to the input of waste oil is formed inside the recovery tank 200. In other embodiments, the recovery pump 300 can adopt an internal structure. The input end of the recovery tank 200 is connected to the drain pipe 510 of the transformer 500 through the connecting pipe 400 and the coupler 100.

[0035] With reference to Figure 2 As shown, the coupler 100 includes an outer pipe 110, an inner pipe 120, a sealing sleeve 130, a tightening member 140, a plug 150 and a recovery oil pipe 170.

[0036] One end of the outer pipe 110 is inserted with an inner pipe 120, and the other end is detachably connected with a sealing sleeve 130. The outer side end of the inner pipe 120 is communicated with a connecting pipe 400 leading to the recovery tank 200. The sealing sleeve 130 is hermetically sleeved on the oil discharge pipe 510 through a tightening member 140. The inner sides of the outer pipe 110, the inner pipe 120 and the sealing sleeve 130 are respectively a first inner cavity 1101, a second inner cavity 1201 and a third inner cavity 1301. In the assembled state, the first inner cavity 1101, the second inner cavity 1201 and the third inner cavity 1301 inside the outer pipe 110, the inner pipe 120 and the sealing sleeve 130 form a communicating closed oil return chamber, ensuring that the oil of the transformer 500 can smoothly flow from the oil discharge pipe 510 into the recovery tank 200 and avoiding leakage.

[0037] Combined with Figures 3-5 , one end of the inner pipe 120 extending into the inner part of the outer pipe 110 is provided with a radially outwardly convex flange 121. The flange 121 is an annular structure located on the outer surface of the inner pipe 120 and is an integral structure with the inner pipe 120. A sealing and limiting structure is provided between the flange 121 and the axial opening end of the outer pipe 110. The opening of the outer pipe 110 for inserting the inner pipe 120 is provided with a radially inwardly bent limiting flange 111. The limiting flange 111 and the flange 121 axially constitute the sealing and limiting structure, which can prevent the inner pipe 120 from falling off when sliding axially relative to the outer pipe 110. It should be noted that the radially inner wall of the limiting flange 111 is closely attached to the outer side wall of the inner pipe 120, which can play an adequate sealing and leakage prevention effect on the premise of ensuring relative sliding. In other embodiments, the sealing effect can be further improved by setting corresponding sealing rings.

[0038] A axially outwardly convex clamping end 122 is provided on the radially inner side of the flange 121. The clamping end 122 has a clamping groove 1221 adapted to the outer contour of the sealing bolt 520 at the end of the oil discharge pipe 510. The clamping end 122 is of a similar n-shaped structure, and the clamping groove 1221 is of an open groove structure. The clamping end 122 of the similar n-shaped structure can better adapt to the outer contour of the sealing bolt 520 at the end of the oil discharge pipe 510 and provide a stable clamping effect. The open groove structure of the clamping groove 1221 facilitates the insertion and clamping of the sealing bolt 520 at the end of the oil discharge pipe 510. The operator does not need to accurately align, and only needs to roughly align the sealing bolt 520 at the end of the oil discharge pipe 510 with the clamping groove 1221 and push it in to complete the clamping, greatly simplifying the connection process and improving the work efficiency.

[0039] Such as Figure 4As shown, a return hole 123 is provided on the outer periphery of the inner tube 120 in the radial direction of the clamping end 122. The return hole 123 forms a communication structure between the outer tube 110 and the internal cavity of the inner tube 120. The return hole 123 is composed of a number of arc-shaped through holes. This design has many advantages. The shape of the arc-shaped through holes can optimize the flow path of the oil of the transformer 500, reduce the flow resistance, enable the oil of the transformer 500 to enter the inner tube 120 more smoothly through the return hole 123, and improve the recovery efficiency. At the same time, the combination of multiple arc-shaped through holes can increase the return area, ensure that the oil of the transformer 500 can be discharged in time and fully during the recovery process, avoid the accumulation of the oil of the transformer 500 in the outer tube 110 due to poor return, and further reduce the possibility of oil dripping. At the same time, the return hole 123 is provided on the outer periphery of the clamping end 122 in the radial direction, so that the clamping end 122 will not affect the normal communication function of the return hole 123 before and after the disassembly of the sealing bolt 520 in the internal space.

[0040] One end of the inner tube 120 away from the clamping end 122 is a knob end 124 located outside the outer tube 110. A plug 150 is connected to the inner side in the radial direction of the knob end 124 through a sealing bearing 160. The plug 150 can rotate relative to the knob end 124 so that the twisting movement of the knob end 124 will not interfere with the connection structure on the plug 150. An oil outlet through hole 151 with a through hole structure is provided on the plug 150. The oil outlet through hole 151 is connected to a recovery oil pipe 170 communicating with the inner cavity of the inner tube 120. The recovery oil pipe 170 is communicated with a connecting pipe 400 leading to a recovery tank 200. An outer end in the axial direction of the knob end 124 is provided with a rotating handle 1241, and an inner end in the axial direction of the rotation is provided with a radially protruding rotating insertion post 1242. The design of the rotating handle 1241 facilitates the operator to hold or rotate the knob end 124 through an external wrench, increasing the convenience of operation. The setting of the rotating insertion post 1242 can be used in cooperation with other auxiliary tools. For example, when a large torque is required to control the recovery process, tools such as a wrench or a long pipe can be connected through the rotating insertion post 1242, further improving the flexibility and controllability of the operation.

[0041] Furthermore, in combination with Figure 6As shown, on the two axial sides of the flange 121 relative to the inner tube 120, there are a first extension part 1211 and a second extension part 1212. The first extension part 1211 is on the same side as the clamping end 122. The outer side surface of the first extension part 1211 is an arc-shaped curved surface. The structural design of the arc-shaped curved surface can play a guiding role in the waste oil return path, improving the efficiency of the waste oil flowing through the return hole 123. The second extension part 1212 is in an L-shaped structure, and a bushing 125 is arranged at its slot. The radial outer contour of the bushing 125 is aligned with the outer contour of the flange 121. The L-shaped second extension part 1212, in cooperation with the first extension part 1211, increases the strength and stability of the flange 121, and also increases the axial distance of the overall outer contour of the flange 121, improving the sliding stability of the inner tube 120 relative to the outer tube 110 and reducing the occurrence of tilting and offset. The setting of the bushing 125 can further reduce the wear on the inner wall of the outer tube 110 and extend the service life of the adapter 100.

[0042] As Figure 2 and Figure 7 shown, at the connection end of the outer tube 110 and the seal sleeve 130, there is a threaded ring 112 with a detachable threaded connection. One end of the seal sleeve 130 is hermetically clamped in the connection gap between the threaded ring 112 and the outer tube 110. This detachable threaded connection method facilitates the installation and replacement of the seal sleeve 130. When the seal sleeve 130 is worn or aged due to long-term use, the threaded ring 112 can be simply unscrewed to easily replace the new seal sleeve 130, reducing the maintenance cost. At the same time, the hermetic clamping design ensures the sealing between the seal sleeve 130 and the outer tube 110, preventing the leakage of transformer oil from the connection. After the other end of the seal sleeve 130 is sleeved on the drain pipe 510, it is tightly fixed by a tightening member 140 on the periphery, achieving the effect of sealed connection. The tightening member 140 specifically adopts components such as a hoop or a clamp, which are prior arts. Their specific structures and working principles will not be elaborated here. Those skilled in the art can select and implement from the prior arts according to the actual operation situation. It should be noted that the seal sleeve 130 is made of a flexible material, such as waterproof nylon cloth, rubber, etc., facilitating the operation of sleeving it on the drain pipe 510.

[0043] In the specific implementation process, first open the oil filling hole at the top of the transformer 500 to connect its oil chamber with the external space. First, wind the open side of the sealing sleeve 130 around the drain pipe 510 so that the sealing bolt 520 at the end of the drain pipe 510 is in the third inner cavity 1301. In this process, by adjusting the overall position and angle of the outer pipe 110 and the inner pipe 120 of the adapter 100, the clamping end 122 is nested on the sealing bolt 520. Subsequently, use the tightening member 140 to seal and connect the open side of the sealing sleeve 130 to the drain pipe 510. At this time, the first inner cavity 1101, the second inner cavity 1201, and the third inner cavity 1301 form a sealed return inner cavity. With the cooperation of the operation of the recovery pump 300 and the connection relationship of the recovery tank 200 and the connecting pipe 400, the sealed return inner cavity can be constructed into a negative pressure state in advance. Subsequently, rotate the inner pipe 120 by turning the knob end 124. In this process, since the clamping end 122 is clamped and fixed to the sealing bolt 520 by the clamping groove 1221, the sealing bolt 520 can be unscrewed. After unscrewing, pull the inner pipe 120 outwards appropriately to drive the sealing bolt 520 away from the end of the drain pipe 510, providing a more sufficient oil outlet gap. Subsequently, under the negative pressure state, the waste oil in the transformer 500 can flow through the drain pipe 510 into the first inner cavity 1101 and the third inner cavity 1301, and enter the second inner cavity 1201 through the return hole 123, and then enter the recovery oil pipe 170 and the connecting pipe 400 through the oil outlet through hole 151 and enter the recovery tank 200. By optimizing the structural design of the adapter 100, the contact area between the transformer oil of the transformer 500 and the outer wall of the transformer 500 is reduced, and the amount of adhered oil is reduced. At the same time, the unique design of the sealing sleeve 130 and the closed oil return chamber formed inside the outer pipe 110, the inner pipe 120, and the sealing sleeve 130 ensure the tightness of the transformer oil during the recovery process and avoid leakage. Even if there is a small amount of transformer oil residue, its adhesion area is greatly reduced, reducing the possibility of oil dripping pollution, reducing the subsequent cleaning workload and the environmental pollution risk.

[0044] Example 2: On the basis of Example 1, combined with Figure 8As shown, in this embodiment, the sealing sleeve 130 is made of an elastic material (rubber). Inside the connection between the sealing sleeve 130 and the tightening member 140, there is a shaping cavity 131. Inside the shaping cavity 131, there is a shaping member 132 that can be bent and deformed. The shaping member 132 is made of a thin aluminum sheet and has a smooth outer periphery after grinding. Inside the shaping cavity 131, there is a filler 133. In this embodiment, the filler 133 is made of plasticine. After the tightening member 140 is tightened, the shaping member 132 and the filler 133 can be tightly packed inside the inner side of the connection between the tightening member 140 and the drain pipe 510, forming a sealed filling structure. The sealing sleeve 130 made of an elastic material can better adapt to the shape of the drain pipe 510 and provide a good sealing effect. The combination of the shaping cavity 131, the shaping member 132, and the filler 133 further enhances the sealing performance. When the tightening member 140 is tightened, the shaping member 132 and the filler 133 can be bent and deformed according to the shape of the drain pipe 510 and tightly fill the inner side of the connection, effectively preventing the leakage of transformer oil and reducing the risk of oil dripping pollution.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A waste transformer oil recovery device, characterized in that, It includes a recovery tank (200) and a recovery pump (300) connected by a connecting pipe (400). The input end of the recovery tank (200) is connected to the drain pipe (510) of the transformer (500) through the connecting pipe (400) and an adapter (100). The adapter (100) includes an outer pipe (110). One end of the outer pipe (110) is inserted with an inner pipe (120), and the other end is detachably connected with a sealing sleeve (130). The outer side end of the inner pipe (120) is communicated with the connecting pipe (400) leading to the recovery tank (200). The sealing sleeve (130) is hermetically sleeved on the drain pipe (510) through a tightening member (140). In the assembled state, a communicated closed oil return chamber is formed inside the outer pipe (110), the inner pipe (120) and the sealing sleeve (130). One end of the inner pipe (120) extending into the inner part of the outer pipe (110) is provided with a radially protruding flange (121). A sealing and limiting structure is provided between the flange (121) and the axially open end of the outer pipe (110). The radially inner side of the flange (121) is provided with an axially protruding clamping end (122). The clamping end (122) has a clamping groove (1221) adapted to the outer contour of the sealing bolt (520) at the end of the drain pipe (510). The inner pipe (120) is provided with a return hole (123) on the radially outer periphery of the clamping end (122). The return hole (123) constitutes a communication structure between the inner chambers of the outer pipe (110) and the inner pipe (120). One end of the inner pipe (120) away from the clamping end (122) is a knob end (124) located outside the outer pipe (110). The radially inner side of the knob end (124) is connected with a plug (150) through a sealing bearing (160). A recovery oil pipe (170) communicating with the inner cavity of the inner pipe (120) is connected to the plug (150). The recovery oil pipe (170) is communicated with the connecting pipe (400) leading to the recovery tank (200).

2. The waste oil recovery device for transformer oil according to claim 1, wherein, The return hole (123) is composed of a plurality of arc-shaped through holes.

3. The waste oil recovery device for transformer oil according to claim 1, wherein, The clamping end (122) is of a similar n-shaped structure, and the clamping groove (1221) is of an open groove structure.

4. A transformer oil waste oil recovery device according to claim 1, characterized in that, On the two axial sides of the flange (121) relative to the inner pipe (120), there are a first extension part (1211) and a second extension part (1212). The first extension part (1211) is on the same side as the clamping end (122), and the outer side surface of the first extension part (1211) is an arc-shaped curved surface.

5. The waste oil recovery device for transformer oil according to claim 4, wherein, The second extension part (1212) is of an L-shaped structure, and a bushing (125) is arranged at its slot hole. The radially outer contour of the bushing (125) is aligned with the outer contour of the flange (121).

6. The waste oil recovery device for transformer oil according to claim 1, wherein The axially outer side end of the knob end (124) is provided with a rotating handle (1241), and the axially inner side end of the rotation is provided with a radially protruding rotating insertion post (1242).

7. The waste oil recovery device for transformer oil according to claim 1, wherein, The connection end of the outer pipe (110) and the sealing sleeve (130) is provided with a threaded ring (112) for detachable threaded connection. One end of the sealing sleeve (130) is hermetically clamped in the connection gap between the threaded ring (112) and the outer pipe (110).

8. A transformer oil waste oil recovery device according to claim 1, characterized in that, The sealing sleeve (130) is made of an elastic material. An internal shaping cavity (131) is provided at the connection between the sealing sleeve (130) and the tightening member (140). An internally disposed shaping member (132) capable of being bent and deformed is provided inside the shaping cavity (131). A filler (133) is disposed inside the shaping cavity (131). After the tightening member (140) is tightened, the shaping member (132) and the filler (133) can be tightly packed inside the connection between the tightening member (140) and the drain pipe (510) to form a sealing and filling structure.

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