Oil-immersed transformer capable of enhancing winding heat dissipation

Abstract

The invention relates to the technical field of transformers, in particular to an oil-immersed transformer capable of enhancing winding heat dissipation, which comprises a triangular shell, a lifting block is arranged at the bottom end in the triangular shell, a triangular isolation frame is mounted at the upper end of the lifting block, the triangular isolation frame and the triangular shell are concentrically arranged, an iron core is arranged in the triangular isolation frame, and a winding is arranged in the triangular isolation frame. The iron cores are arranged in a triangular shape, a core column of the iron core at the same end is sleeved with an insulating cylinder, and the insulating cylinder is sleeved with a winding structure; when the transformer works, heat generated by the winding structure on the insulating cylinder exchanges heat with insulating oil to cool the winding structure, and then due to the arrangement of the triangular isolation frame, the insulating oil flows according to a directional path to form circulation, so that the insulating oil is better cooled, and the heat dissipation effect on the winding structure is enhanced.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and in particular to an oil-immersed transformer that enhances winding heat dissipation. Background Technology

[0002] Oil-immersed transformers use oil as the primary insulation and cooling medium. They are a new type of high-performance transformer with a more rational structure and superior performance. Their three-dimensional wound core, with its three core columns arranged in an equilateral triangle, eliminates air gaps in the magnetic circuit, resulting in tighter winding, uniform and shortest lengths for the three magnetic circuits, and a cross-sectional area closer to a circle. This further improves performance, reduces losses and noise, achieves three-phase balance, and reduces third harmonic components. This product is more suitable for power grid upgrades in urban and rural areas, industrial and mining enterprises, and is also suitable for combined transformers and prefabricated substation transformers.

[0003] For example, an oil-immersed transformer with announcement number CN220731301U includes a transformer body; an oil tank for storing oil; an oil conservator installed on the side wall of the oil tank, and along the height direction of the oil-immersed transformer, the oil tank has a top wall and a bottom wall arranged opposite each other, the distance between the oil conservator and the top wall being smaller than the distance between the oil conservator and the bottom wall; and a connecting pipe connecting the oil tank and the oil conservator. Therefore, the oil-immersed transformer according to the above-mentioned prior art effectively avoids the oil conservator occupying the space above the oil tank, which is beneficial to reducing the height of the oil-immersed transformer and also to reducing the length of the connecting pipe, thus achieving the effect of reducing the cost of the oil-immersed transformer.

[0004] However, the above-mentioned existing technologies still have some defects in terms of transformer heat dissipation: 1. In the above-mentioned existing technologies, the transformer body is installed in the first receiving cavity, and the first receiving cavity stores oil for insulating the transformer body from the oil tank and for cooling the transformer body. However, while the oil cools the transformer body, uneven oil temperature in the cavity is likely to occur, affecting its heat dissipation effect.

[0005] 2. In the prior art, when the pressure in the first receiving cavity changes, the oil in the second receiving cavity flows to the second interface through the conduit under the action of the pressure difference, and then enters the first receiving cavity to achieve the effect of replenishing the oil, thereby maintaining the pressure in the first receiving cavity. If the transformer body generates high heat due to a fault and causes a fire, the fire is easy to spread along the oil, and there is no function to deal with dangers in extreme situations.

[0006] Based on this, and given the above viewpoints, there is still room for improvement in existing technologies for transformer heat dissipation. Summary of the Invention

[0007] To solve the above-mentioned technical problems, this application provides an oil-immersed transformer with enhanced winding heat dissipation, adopting the following technical solution: An oil-immersed transformer for enhancing winding heat dissipation includes a triangular housing. An oil supply pipe is provided at the upper end of the triangular housing and connects to the interior of the triangular housing. High-voltage bushings and low-voltage bushings are respectively provided on both sides of the top of the triangular housing. A lifting block is provided at the bottom of the interior of the triangular housing. A triangular isolation frame is installed on the upper end of the lifting block and is concentrically arranged with the triangular housing. An iron core is provided inside the triangular isolation frame and the iron cores are arranged in a triangular pattern. An insulating cylinder is sleeved on the core column of the iron core at the same end, and a winding structure is sleeved on the insulating cylinder.

[0008] Preferably, the upper end of the lifting block is provided with a fixing component, which includes a lower fixing frame provided at the upper end of the lifting block and an upper fixing frame provided at the side end of the upper yoke of the iron core. Fixing plates are slidably provided at the side ends of the lower fixing frame and the upper fixing frame, and the lower yoke of the iron core is clamped and fixed by the lower fixing frame and the fixing plates, and the upper yoke of the iron core is clamped and fixed by the upper fixing frame and the fixing plates. A number of clamping bolts are connected between the lower fixing frame and the fixing plates and between the upper fixing frame and the fixing plates.

[0009] Preferably, a connecting component is provided between the upper fixed frames. The connecting component includes a first connecting plate provided at one end of the upper fixed frame and a second connecting plate provided at the other end of the upper fixed frame. A sliding hole is provided between the first connecting plate and the second connecting plate. A fixing pin is slidably disposed in the sliding hole, and a fixing bolt is provided at the upper end of the fixing pin.

[0010] Preferably, a connecting cylinder is provided in the middle of the lifting block, and the upper and lower ends of the connecting cylinder penetrate the triangular shell.

[0011] Preferably, an insulating connecting pipe is provided at the upper end of the insulating cylinder, and the insulating connecting pipe communicates with the inside of the connecting cylinder. A connecting main pipe is vertically provided inside the connecting cylinder, and the insulating connecting pipe is connected to the inside of the connecting main pipe. The neutral wire in the insulating cylinder is led out through the insulating connecting pipe and the connecting main pipe.

[0012] Preferably, a temperature sensor is connected in series on the main connecting pipe, and a neutral wire sleeve is provided at the upper end of the main connecting pipe.

[0013] Preferably, the connecting cylinder is provided with an isolation device, the isolation device including a mounting plate disposed at the upper end of the triangular isolation frame, a sliding column disposed at the upper end of the mounting plate, an isolation cover slidably disposed on the sliding column, the sliding column and the isolation cover are connected by a hot melt ring, and the isolation cover is provided with a plurality of pressure relief holes.

[0014] Preferably, the isolation device further includes connecting columns arranged circumferentially around the isolation cover, and an isolation cover is provided at the lower end of the connecting columns. The lower end of the isolation cover is provided with a clearance groove corresponding to the lifting block.

[0015] Preferably, the isolation device further includes a locking component disposed on the connecting column and the side wall of the triangular isolation frame. The locking component includes a limiting block disposed circumferentially on the side wall of the triangular isolation frame. A sliding groove is provided at the side end of the connecting column, and a sliding wedge is slidably disposed in the sliding groove. The sliding wedge is connected to the bottom of the sliding groove by a return spring.

[0016] Preferably, each side wall of the triangular shell is provided with a mounting frame, and the mounting frame is provided with a heat dissipation plate evenly arranged, and the heat dissipation plates on the same side are fixedly connected by a connecting rod.

[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. In this invention, when the transformer is working, the heat generated by the winding structure on the insulating cylinder exchanges heat with the insulating oil to cool the winding structure. Then, due to the setting of the triangular isolation frame, the insulating oil flows along a directional path to form a circulation, which allows the insulating oil to be cooled better and enhances the heat dissipation effect on the winding structure.

[0018] 2. When the winding structure overheats abnormally and catches fire, the isolation cover slides downward under the action of gravity to cover the upper end of the triangular isolation frame. At the same time, the isolation cover blocks the gap between the triangular isolation frame and the bottom of the triangular shell, so that a sealed space is formed inside the triangular isolation frame, preventing the entry of air and achieving the purpose of preventing fire and extinguishing fire.

[0019] 3. By placing the neutral wire inside the connecting cylinder, this invention avoids abnormal heating of the neutral wire caused by the heating of the winding structure. At the same time, the temperature sensor detects the temperature at the neutral point. Since the center point should not be significantly heated under normal circumstances, an alarm is issued when the temperature sensor detects that the neutral point is overheated. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a structural diagram of the lifting block, triangular isolation frame, iron core, insulating cylinder and winding structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the fixing component of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of the connecting component of the present invention.

[0024] Figure 5This is a schematic diagram of the structure of the connecting cylinder, insulating connecting pipe, connecting main pipe, temperature sensor and neutral line bushing of the present invention.

[0025] Figure 6 This is a schematic diagram of the structure between the mounting frame, heat sink, and connecting rod of the present invention.

[0026] Figure 7 This is a schematic diagram of the isolation device of the present invention.

[0027] Figure 8 This is a schematic diagram of the locking component of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 11. Triangular shell; 12. Oil pipeline; 13. High-pressure bushing; 14. Low-pressure bushing; 21. Lifting block; 22. Triangular isolation frame; 23. Iron core; 24. Insulating cylinder; 25. Winding structure; 3. Fixing assembly; 31. Lower fixing frame; 32. Upper fixing frame; 33. Fixing clamp; 34. Clamping bolt; 4. Connecting assembly; 41. First connecting plate; 42. Second connecting plate; 43. Sliding hole; 44. Fixing pin; 45. Fixing bolt; 5. 1. Connecting cylinder; 52. Insulating connecting pipe; 53. Connecting main pipe; 54. Temperature sensor; 55. Neutral wire sleeve; 6. Isolation device; 61. Mounting plate; 62. Sliding column; 63. Isolation cover; 64. Hot melt ring; 65. Pressure reducing hole; 66. Connecting column; 67. Isolation cover; 68. Clearance groove; 7. Locking assembly; 71. Limiting block; 72. Sliding groove; 73. Sliding wedge; 74. Return spring; 81. Mounting frame; 82. Heat sink; 83. Connecting rod. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1 to 8 This application will be described in further detail.

[0030] This application discloses an oil-immersed transformer that enhances winding heat dissipation. It can enhance the convection of insulating oil inside the transformer to improve the heat dissipation effect. In the event of an abnormal internal temperature and fire, it can isolate the entry of outside air to extinguish the fire.

[0031] Example 1: refer to Figure 1 An oil-immersed transformer for enhancing winding heat dissipation includes a triangular housing 11, an oil pipe 12 is provided at the upper end of the triangular housing 11 and the oil pipe 12 connects to the interior of the triangular housing 11, and a high-voltage bushing 13 and a low-voltage bushing 14 are respectively provided on both sides of the top of the triangular housing 11.

[0032] In actual use, the oil supply pipe 12 is connected to the external oil conservator to adjust the volume change of the insulating oil inside the triangular housing 11, isolate air and moisture, and ensure the performance of the insulating oil. The lower end of the high voltage bushing 13 is connected to the high voltage winding lead inside the triangular housing 11, and the lower end of the low voltage bushing 14 is connected to the low voltage lead bushing inside the triangular housing 11.

[0033] refer to Figure 2 A lifting block 21 is provided at the bottom of the triangular shell 11. A triangular isolation frame 22 is installed on the upper end of the lifting block 21, leaving a gap at one end between the triangular isolation frame 22 and the bottom of the triangular shell 11 to facilitate the convection of insulating oil. The triangular isolation frame 22 and the triangular shell 11 are concentrically arranged. An iron core 23 is provided inside the triangular isolation frame 22, and the iron cores 23 are arranged in a triangular pattern. An insulating cylinder 24 is sleeved on the core column of the iron core 23 at the same end. A winding structure 25 is sleeved on the insulating cylinder 24. The windings are arranged concentrically, with the low-voltage winding and the high-voltage winding arranged from the inside to the outside.

[0034] When this transformer is working, the heat generated by the winding structure 25 on the insulating cylinder 24 heats the insulating oil inside the triangular isolation frame 22. Under the convection of the insulating oil, the heated insulating oil flows upward and flows to the outside of the triangular isolation frame 22 after cooling. The cold insulating oil on the outside of the triangular isolation frame 22 replenishes the inside of the triangular isolation frame 22, forming a circulation. This allows the insulating oil to flow along a directional path, enhancing the heat dissipation effect on the winding structure 25.

[0035] refer to Figure 3 The diagram shows the structure of the fixing component 3 of the present invention. In order to fix the iron core 23 to the inside of the triangular isolation frame 22, the upper end of the lifting block 21 is provided with the fixing component 3. The fixing component 3 includes a lower fixing frame 31 provided at the upper end of the lifting block 21 and an upper fixing frame 32 provided at the upper yoke side end of the iron core 23. Fixing clamps 33 are slidably provided at the side ends of the lower fixing frame 31 and the upper fixing frame 32. The lower yoke of the iron core 23 is clamped and fixed by the lower fixing frame 31 and the fixing clamps 33, and the upper yoke of the iron core 23 is clamped and fixed by the upper fixing frame 32 and the fixing clamps 33. Several clamping bolts 34 are connected between the lower fixing frame 31 and the fixing clamps 33 and between the upper fixing frame 32 and the fixing clamps 33. After the silicon steel sheets are stacked to form the iron core 23, the fixing clamps 33 clamp the upper yoke and the lower yoke of the iron core 23 respectively by the clamping bolts 34, so that the iron core 23 is fixed inside the triangular isolation frame 22.

[0036] refer to Figure 4The diagram shows the structure of the connecting component 4 of the present invention. In order to connect the upper yokes of adjacent iron cores 23 and form an integral spatial structure to enhance its stability, a connecting component 4 is provided between the upper fixed frames 32. The connecting component 4 includes a first connecting plate 41 provided at one end of the upper fixed frame 32 and a second connecting plate 42 provided at the other end of the upper fixed frame 32. Sliding holes 43 are respectively opened between the first connecting plate 41 and the second connecting plate 42. A fixing pin 44 is slidably provided in the sliding hole 43, and a fixing bolt 45 is provided at the upper end of the fixing pin 44.

[0037] When connecting the upper yoke of adjacent iron cores 23, the fixing bolts 45 are passed through the sliding holes 43 of the first connecting plate 41 and the second connecting plate 23, and the fixing pins 44 are slid according to the position of the iron cores 23. Then the fixing bolts 45 are tightened to fix them. At this time, the iron cores 23 together form a rigid space truss structure. This structure has high mechanical stability and will not tilt due to vibration.

[0038] refer to Figure 5 To bring out the neutral wire from the winding for connection to the power grid, a connecting cylinder 51 is provided in the middle of the lifting block 21, and the upper and lower ends of the connecting cylinder 51 penetrate the triangular shell 11. An insulating connecting pipe 52 is provided at the upper end of the insulating cylinder 24, and the insulating connecting pipe 52 connects to the inside of the connecting cylinder 51. A connecting main pipe 53 is vertically provided inside the connecting cylinder 51. The insulating connecting pipe 52 is connected to the inside of the connecting main pipe 53 to avoid the heat inside the triangular shell 11 affecting the performance of the neutral wire in the insulating connecting pipe 52. The neutral wire in the insulating cylinder 24 is led out through the insulating connecting pipe 52 and the connecting main pipe 53, which facilitates the grounding of the neutral wire and its connection to the power grid. A temperature sensor 54 is connected in series on the connecting main pipe 53. The temperature sensor 54 detects the temperature at the neutral point. Since the center point should not be significantly heated under normal circumstances, an alarm is issued when the temperature sensor 54 detects that the neutral point is overheated. A neutral wire sleeve 55 is provided at the upper end of the connecting main pipe 53.

[0039] refer to Figure 6 In order to ensure that the insulating oil inside the triangular shell 11 can dissipate heat fully, each side wall of the triangular shell 11 is provided with a mounting frame 81, and a heat dissipation plate 82 is provided on the mounting frame 81 to increase the heat dissipation area. The heat dissipation plates 82 on the same side are fixedly connected by a connecting rod 83 to enhance the stability between the heat dissipation plates 82.

[0040] Example 2: refer to Figure 7Based on Embodiment 1, when the winding structure 25 catches fire due to abnormal heating, an isolation device 6 is provided on the connecting cylinder 51 to isolate the air and achieve the effect of extinguishing the fire. The isolation device 6 includes a mounting plate 61 located at the upper end of the triangular isolation frame 22. A sliding post 62 is provided at the upper end of the mounting plate 61, and an isolation cover 63 is slidably mounted on the sliding post 62. The isolation cover 63 slides downward to block the opening at the upper end of the triangular isolation frame 22. The connection between the sliding post 62 and the isolation cover 63 is achieved by a hot melt ring 64. When the temperature is too high, the hot melt ring 64 loses its ability to control the sliding post. The connection between the column 62 and the isolation cover 63 is as follows: the isolation cover 63 is provided with several pressure relief holes 65 to prevent the internal insulating oil of the triangular isolation frame 22 from expanding and exploding due to excessive internal temperature. The isolation device 6 also includes a connecting column 66 arranged circumferentially around the isolation cover 63. The lower end of the connecting column 66 is provided with an isolation cover 67. The isolation cover 67 slides downward to block the gap between the triangular isolation frame 22 and the bottom of the triangular shell 11. The lower end of the isolation cover 67 is provided with a relief groove 68 corresponding to the lifting block 21, so that the isolation cover 67 can slide to the bottom of the triangular shell 11.

[0041] When the winding structure 25 overheats abnormally and ignites the insulating oil inside the triangular isolation frame 22, the hot melt ring 64 melts under the high temperature and loses its fixing function to the sliding post 62 and the isolation cover 63. The isolation cover 63 slides down under the action of gravity to cover the upper end of the triangular isolation frame 22. At the same time as the isolation cover 63 slides down, the connecting post 66 and the isolation cover 67 slide down simultaneously. The isolation cover 67 blocks the gap between the triangular isolation frame 22 and the bottom of the triangular shell 11, so that a sealed space is formed inside the triangular isolation frame 22, preventing the entry of air to achieve the purpose of preventing fire and extinguishing fire.

[0042] refer to Figure 8 This is a schematic diagram of the locking component 7 of the present invention. In order to prevent the insulating oil from being pushed open again due to excessive internal temperature of the triangular isolation frame 22 after the isolation cover 63 and the isolation cover 67 block the upper and lower ends of the triangular isolation frame 22, the isolation device 6 also includes a locking component 7 provided on the connecting column 66 and the side wall of the triangular isolation frame 22. The locking component 7 includes a limiting block 71 circumferentially provided on the side wall of the triangular isolation frame 22. A sliding groove 72 is provided on the side end of the connecting column 66. A sliding wedge 73 is slidably provided in the sliding groove 72. The sliding wedge 73 is connected to the bottom of the sliding groove 72 by a return spring 74.

[0043] When the isolation cover 63 moves downward, the sliding wedge 73 on the connecting post 66 passes the limiting block 71 and is located at the lower end of the limiting block 71. At this time, the lower end of the limiting block 71 abuts against the sliding wedge 73, restricting the sliding of the connecting post 66 and thus allowing the isolation cover 63 and the isolation shield 67 to move upward.

[0044] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An oil-immersed transformer for enhancing winding heat dissipation, comprising a triangular housing (11), wherein an oil supply pipe (12) is provided at the upper end of the triangular housing (11) and the oil supply pipe (12) connects to the interior of the triangular housing (11), and a high-voltage bushing (13) and a low-voltage bushing (14) are respectively provided on both sides of the top of the triangular housing (11), characterized in that: A lifting block (21) is provided at the bottom of the triangular shell (11). A triangular isolation frame (22) is installed at the top of the lifting block (21). The triangular isolation frame (22) is concentrically arranged with the triangular shell (11). An iron core (23) is provided inside the triangular isolation frame (22). The iron cores (23) are arranged in a triangular pattern. An insulating cylinder (24) is sleeved on the core column of the iron core (23) at the same end. A winding structure (25) is sleeved on the insulating cylinder (24).

2. The oil-immersed transformer for enhanced winding heat dissipation according to claim 1, characterized in that: The upper end of the lifting block (21) is provided with a fixing component (3). The fixing component (3) includes a lower fixing frame (31) provided at the upper end of the lifting block (21) and an upper fixing frame (32) provided at the upper yoke side end of the iron core (23). The lower fixing frame (31) and the upper fixing frame (32) are both slidably provided with fixing plates (33). The lower yoke of the iron core (23) is clamped and fixed by the lower fixing frame (31) and the fixing plates (33). The upper yoke of the iron core (23) is clamped and fixed by the upper fixing frame (32) and the fixing plates (33). Several clamping bolts (34) are connected between the lower fixing frame (31) and the fixing plates (33) and between the upper fixing frame (32) and the fixing plates (33).

3. An oil-immersed transformer for enhanced winding heat dissipation according to claim 2, characterized in that: A connecting component (4) is provided between the upper fixed frames (32). The connecting component (4) includes a first connecting plate (41) provided at one end of the upper fixed frame (32) and a second connecting plate (42) provided at the other end of the upper fixed frame (32). A sliding hole (43) is provided between the first connecting plate (41) and the second connecting plate (42). A fixing pin (44) is slidably provided in the sliding hole (43). A fixing bolt (45) is provided at the upper end of the fixing pin (44).

4. An oil-immersed transformer for enhancing winding heat dissipation according to claim 1, characterized in that: The lifting block (21) is provided with a connecting cylinder (51) in the middle, and the upper and lower ends of the connecting cylinder (51) pass through the triangular shell (11).

5. An oil-immersed transformer for enhancing winding heat dissipation according to claim 4, characterized in that: An insulating connecting pipe (52) is provided at the upper end of the insulating cylinder (24), and the insulating connecting pipe (52) is connected to the inside of the connecting cylinder (51). A connecting main pipe (53) is vertically arranged inside the connecting cylinder (51). The insulating connecting pipe (52) is connected to the inside of the connecting main pipe (53), and the neutral wire in the insulating cylinder (24) is led out through the insulating connecting pipe (52) and the connecting main pipe (53).

6. An oil-immersed transformer for enhancing winding heat dissipation according to claim 5, characterized in that: A temperature sensor (54) is connected in series on the main connecting pipe (53), and a neutral wire sleeve (55) is provided at the upper end of the main connecting pipe (53).

7. An oil-immersed transformer for enhancing winding heat dissipation according to claim 4, characterized in that: An isolation device (6) is provided on the connecting cylinder (51). The isolation device (6) includes a mounting plate (61) located on the upper end of the triangular isolation frame (22). A sliding column (62) is provided on the upper end of the mounting plate (61). An isolation cover (63) is slidably provided on the sliding column (62). The connection between the sliding column (62) and the isolation cover (63) is connected by a hot melt ring (64). A number of pressure relief holes (65) are provided on the isolation cover (63).

8. An oil-immersed transformer for enhancing winding heat dissipation according to claim 7, characterized in that: The isolation device (6) also includes a connecting column (66) arranged circumferentially on the isolation cover (63). The lower end of the connecting column (66) is provided with an isolation cover (67). The lower end of the isolation cover (67) is provided with a relief groove (68) corresponding to the lifting block (21).

9. An oil-immersed transformer for enhancing winding heat dissipation according to claim 8, characterized in that: The isolation device (6) further includes a locking component (7) provided on the connecting column (66) and the side wall of the triangular isolation frame (22). The locking component (7) includes a limiting block (71) circumferentially provided on the side wall of the triangular isolation frame (22). A sliding groove (72) is provided on the side end of the connecting column (66). A sliding wedge (73) is slidably provided in the sliding groove (72). The sliding wedge (73) is connected to the bottom of the sliding groove (72) by a return spring (74).

10. An oil-immersed transformer for enhancing winding heat dissipation according to claim 1, characterized in that: Each side wall of the triangular shell (11) is provided with a mounting frame (81), and a heat sink (82) is provided on the mounting frame (81). The heat sinks (82) on the same side are fixedly connected by a connecting rod (83).

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