Oil-immersed transformer

Abstract

The utility model belongs to the field of transformers, and particularly relates to an oil-immersed transformer, which comprises a base, an oil tank and a winding assembly, the oil tank comprises a tank bottom, a tank wall, a tank edge and a tank cover, the outer side of the tank cover is provided with a bending part, the tail part of the bending part is provided with a welding part extending out of the tank wall, and the welding part is welded on the tank edge. A containing space is formed between the outer side of the tank cover and the tank edge, a sealing piece matched with the tank cover and the tank edge in a sealing mode is arranged in the containing space, and the welding part is separated from hydraulic oil in the oil tank through the sealing piece. The outer side of the tank cover is designed to be of a bent structure, the containing space is formed between the bent portion of the tank cover and the tank edge, the sealing piece is placed in the containing space, the sealing piece is made of high-temperature-resistant silicon rubber, the sealing piece can separate the welding portion from hydraulic oil in the oil tank, welding slag cannot enter the oil tank during welding, transformer oil cannot enter a welding area, and the welding effect is good. Acetylene can be prevented from being separated out of transformer oil due to high temperature, and the oiling test qualification rate of the transformer can be guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, specifically relating to an oil-immersed transformer. Background Technology

[0002] An oil-immersed transformer is a power transformer that uses insulating oil as both a cooling and insulating medium and is widely used in power systems. An oil-immersed transformer includes a core, windings, insulation system, oil tank, and cooling system.

[0003] The existing oil-immersed transformer tank is formed by welding the tank bottom, tank walls, tank edges, and tank cover. During the production process, the tank cover and tank edges are prone to deformation, and the tank cover and tank edges cannot fit completely, leaving gaps between them. During welding, welding slag can easily enter the oil tank, leading to a decrease in the transformer's insulation performance and even burning out the transformer. Moreover, the transformer oil entering the welding area will release acetylene due to the high temperature of welding, causing the transformer to fail the oiling test. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an oil-immersed transformer that can effectively solve the problem of welding slag entering the oil tank.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An oil-immersed transformer includes a base, an oil tank mounted on the base, and a winding assembly disposed within the oil tank. The oil tank includes a tank bottom, a tank wall, a tank edge, and a tank cover. The outer side of the tank cover has a bent portion, and the tail of the bent portion has a welded portion extending outside the tank wall. The welded portion is welded to the tank edge. An accommodating space is formed between the outer side of the tank cover and the tank edge. A sealing element that seals with the tank cover and the tank edge is disposed within the accommodating space. The sealing element separates the welded portion from the hydraulic oil inside the oil tank.

[0006] In some embodiments, the inner side of the box has a limiting portion that bends and extends into the box wall, and the limiting portion and the bending portion of the box cover form the accommodating space.

[0007] In some embodiments, the outer side of the box edge has an outer edge extending outward from the box wall, and the welding part is welded to the outer edge.

[0008] In some embodiments, the width of the outer edge is greater than the width of the welded portion.

[0009] In some embodiments, a plurality of heat sinks are arranged at intervals on the outer wall of the box, and a support column is provided at both ends of the plurality of heat sinks.

[0010] In some embodiments, the base includes two support plates symmetrically arranged on the bottom of the box, and each of the two support plates is provided with reinforcing ribs.

[0011] In some embodiments, the winding assembly includes two upper clamping plates, two lower clamping plates, an iron core, and three windings. The two upper clamping plates are clamped on both sides of one end of the iron core, and a first bolt is connected between the two upper clamping plates. The two lower clamping plates are clamped on both sides of the other end of the iron core, and a second bolt is connected between the two lower clamping plates. The three windings are arranged at intervals on the iron core.

[0012] In some embodiments, an insulating isolation plate is provided between two adjacent windings corresponding to the two upper clamping plates and the two lower clamping plates.

[0013] In some embodiments, the insulating isolation plate has multiple raised strips distributed on both sides facing the winding, and flow channels for transformer oil to circulate are formed between the multiple raised strips.

[0014] In some embodiments, positioning grooves are provided on the two upper clamping plates and the two lower clamping plates at the ends of the insulating isolation plate, and the ends of the insulating isolation plate are respectively engaged in the positioning grooves, thus forming a snap-fit ​​engagement between the insulating isolation plate and the two upper clamping plates and the two lower clamping plates.

[0015] The beneficial effects of this utility model are as follows: The outer side of the cover adopts a bent structure design, and an accommodating space is formed between the bent part of the cover and the edge of the cover. A sealing element is placed in the accommodating space. The sealing element is made of high-temperature resistant silicone rubber. The sealing element can separate the welding part from the hydraulic oil in the oil tank. During welding, the welding slag will not enter the oil tank, and the transformer oil will not enter the welding area. This can prevent the transformer oil from releasing acetylene due to high temperature and ensure the pass rate of the transformer oiling test. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a structural diagram of an embodiment of the present utility model;

[0018] Figure 2 This is a front view of the winding assembly according to an embodiment of the present utility model;

[0019] Figure 3 This is a left view of the winding assembly according to an embodiment of the present invention;

[0020] Figure 4 This is a front view of the insulating isolation plate according to an embodiment of the present utility model. Detailed Implementation

[0021] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0023] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0025] like Figure 1As shown, an oil-immersed transformer includes a base 1, an oil tank 2 mounted on the base 1, and a winding assembly 3 disposed within the oil tank 2. The oil tank 2 includes a tank bottom 21, a tank wall 22, a tank edge 23, and a tank cover 24. The outer side of the tank cover 24 has a bent portion 241, and the tail of the bent portion 241 has a welded portion 242 extending outside the tank wall 22. The welded portion 242 is welded to the tank edge 23. An accommodating space 200 is formed between the outer side of the tank cover 24 and the tank edge 23. A sealing element 25 is disposed within the accommodating space 200 to seal and cooperate with the tank cover 24 and the tank edge 23. The sealing element 25 separates the welded portion 242 from the hydraulic oil 26 inside the oil tank 2. The outer side of the tank cover adopts a bent structure design, forming an accommodating space between the bent part of the cover and the tank edge. A sealing element, made of high-temperature resistant silicone rubber, is placed within this space. This sealing element separates the welded part from the hydraulic oil in the tank, preventing weld slag from entering the tank and transformer oil from entering the welded area. This avoids the release of acetylene from the transformer oil at high temperatures, ensuring the transformer's oiling test pass rate. The inner side of the tank edge 23 has a limiting part 231 that bends inward towards the tank wall 22. An accommodating space 200 is formed between the limiting part 231 and the bent part 241 of the tank cover 24. The limiting part limits the sealing element, thus ensuring the sealing performance between the sealing element and the tank cover and tank edge. The outer side of the tank edge 23 has an outer edge 232 that extends outward towards the tank wall 22. The welded part 242 is welded to the outer edge 232. The width of the outer edge 232 is greater than the width of the welded part 242. The welding section is welded to the outer edge of the enclosure, facilitating the welding of the enclosure cover to the enclosure edge. Multiple heat dissipation fins 221 are spaced apart on the outer wall of the enclosure 22, with support columns 222 at both ends of each fin. The heat dissipation fins facilitate transformer cooling, and the support columns reinforce the fins, improving their overall strength. The base 1 includes two symmetrically arranged support plates 11 on the enclosure bottom 21, each with reinforcing ribs 111. The base employs a double-support plate structure design, facilitating the handling of the transformer, and the reinforcing ribs on the support plates enhance their overall strength.

[0026] like Figure 2 , 3As shown in Figure 4, the winding assembly 3 includes two upper clamping plates 31, two lower clamping plates 32, an iron core 33, and three windings 34. The two upper clamping plates 31 clamp the two sides of one end of the iron core 33, and a first bolt 35 connects the two upper clamping plates 31. The two lower clamping plates 32 clamp the two sides of the other end of the iron core 33, and a second bolt 36 connects the two lower clamping plates 32. The three windings 34 are arranged at intervals on the iron core 33. The winding assembly adopts a modular structure design, which is conducive to the modular assembly of the transformer and improves assembly efficiency. An insulating isolation plate 37 is provided between the two upper clamping plates 31 and the two lower clamping plates 32, and between adjacent windings 34. The insulating isolation plate can play an insulating and isolating role, thereby improving the three-phase insulation performance of the winding assembly.

[0027] like Figure 2 , 4 As shown, the insulating isolation plate 37 has multiple protrusions 371 distributed on both sides facing the winding 34, and flow channels 370 are formed between the multiple protrusions 371 to allow transformer oil 26 to flow. The transformer oil can flow within the flow channels, thereby improving the heat dissipation performance of the transformer. Positioning grooves 300 are respectively provided on the two upper clamping plates 31 and the two lower clamping plates 32 corresponding to both ends of the insulating isolation plate 37. The two ends of the insulating isolation plate 37 are respectively engaged in the positioning grooves 300, forming a snap-fit ​​engagement between the insulating isolation plate 37 and the two upper clamping plates 31 and the two lower clamping plates 32. The insulating isolation plate is assembled with the upper and lower clamping plates in a snap-fit ​​manner, which helps to improve the assembly efficiency of the winding assembly.

[0028] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. An oil-immersed transformer, comprising a base, an oil tank mounted on the base, and a winding assembly disposed within the oil tank, characterized in that: The oil tank includes a bottom, walls, edges, and a cover. The cover has a bent portion on its outer side, and the tail of the bent portion has a welded portion extending out of the walls. The welded portion is welded to the edges. An accommodating space is formed between the outer side of the cover and the edges. A sealing element is provided in the accommodating space to seal against the cover and edges. The sealing element separates the welded portion from the hydraulic oil in the tank.

2. The oil-immersed transformer according to claim 1, characterized in that: The inner side of the box has a limiting part that bends and extends into the box wall, and the limiting part and the bending part of the box cover form the accommodating space.

3. The oil-immersed transformer according to claim 2, characterized in that: The outer side of the box edge has an outer edge extending outward from the box wall, and the welding part is welded to the outer edge.

4. The oil-immersed transformer according to claim 3, characterized in that: The width of the outer edge is greater than the width of the welded part.

5. The oil-immersed transformer according to claim 1, characterized in that: The outer wall of the box is provided with a plurality of heat sinks arranged at intervals, and each of the plurality of heat sinks is provided with a support column at both ends.

6. The oil-immersed transformer according to claim 1, characterized in that: The base includes two support plates symmetrically arranged on the bottom of the box, and each of the two support plates is provided with reinforcing ribs.

7. The oil-immersed transformer according to claim 1, characterized in that: The winding assembly includes two upper clamping plates, two lower clamping plates, an iron core, and three windings. The two upper clamping plates are clamped on both sides of one end of the iron core, and a first bolt connects the two upper clamping plates. The two lower clamping plates are clamped on both sides of the other end of the iron core, and a second bolt connects the two lower clamping plates. The three windings are arranged at intervals on the iron core.

8. The oil-immersed transformer according to claim 7, characterized in that: An insulating isolation plate is provided between the two upper clamping plates and the two lower clamping plates, corresponding to two adjacent windings.

9. The oil-immersed transformer according to claim 8, characterized in that: The insulating isolation plate has multiple raised strips distributed on both sides of the winding, and flow channels for transformer oil to circulate are formed between the multiple raised strips.

10. The oil-immersed transformer according to claim 8 or 9, characterized in that: The two upper clamping plates and the two lower clamping plates are respectively provided with positioning grooves at both ends of the insulating isolation plate. The two ends of the insulating isolation plate are respectively engaged in the positioning grooves, forming a snap-fit ​​connection between the insulating isolation plate and the two upper clamping plates and the two lower clamping plates.

Images