A sealing structure of an oil-immersed transformer

Abstract

The utility model relates to a kind of sealing structure of oil-immersed transformer, including oil-immersed transformer box, butt joint along, upper cover and sealing rubber strip, butt joint along is fixed in oil-immersed transformer box top, upper cover is detachably connected on butt joint along, the butt joint along is integrally connected with high-low convex along body, convex along is integrally connected on high-low convex along body, the bottom of the upper cover is equipped with butt joint gap, butt joint gap includes butt joint chamber and sealing chamber, high-low convex along body is located in butt joint chamber, sealing flange is fixed in sealing chamber, the sealing rubber strip is located in sealing chamber, the bottom of the sealing rubber strip has accommodating gap, convex along is located in accommodating gap, the top of the sealing rubber strip has sealing gap, the sealing flange is located in this sealing gap and is clamped. The sealing structure of the oil-immersed transformer, high-low convex along body, butt joint gap and the cooperation of sealing rubber strip form labyrinth sealing structure, effectively prevent external liquid invasion and internal oil leakage.

Description

Technical Field

[0001] This utility model relates to the field of oil-immersed transformer technology, specifically to a sealing structure for an oil-immersed transformer. Background Technology

[0002] An oil-immersed transformer is a type of transformer in which the iron core and windings are immersed in insulating oil. It utilizes the high insulation and heat dissipation properties of oil to achieve efficient operation. Its main structure includes the iron core, windings, oil tank, radiator, and protection devices (such as gas relays).

[0003] As a commonly used and important piece of equipment in power systems, the sealing performance of oil-immersed transformers directly affects their operational safety and service life. Currently, most common sealing structures for oil-immersed transformers adopt simple planar seals or single-layer sealing strip structures, which have insufficient sealing performance and pose a risk of external moisture infiltration or internal insulating oil leakage. When these situations occur, they can easily lead to safety hazards such as decreased insulation performance, equipment short circuits, or even fires. Therefore, a sealing structure for oil-immersed transformers is proposed. Utility Model Content

[0004] Based on the above description, this utility model provides a sealing structure for an oil-immersed transformer, which solves the technical problems pointed out in the background art.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A sealing structure for an oil-immersed transformer includes an oil-immersed transformer housing, a mating edge, a top cover, and a sealing strip. The mating edge is fixed to the top of the oil-immersed transformer housing, and the top cover is detachably connected to the mating edge. The mating edge is integrally connected with high and low convex edges, and a raised edge is integrally connected to the high and low convex edges. The bottom of the upper cover is provided with a docking notch, which includes a docking chamber and a sealing chamber. The high and low convex bodies are located in the docking chamber, and a sealing flange is fixed in the sealing chamber. The sealing strip is located in the sealing chamber. The bottom of the sealing strip has a receiving notch, and the protruding edge is located in the receiving notch. The top of the sealing strip has a sealing notch, and the sealing flange is snapped into this sealing notch.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the high and low convex edge body has an upper high plane and an upper low plane, and the convex edge is integrally connected to the upper high plane.

[0008] Furthermore, the sealing flange is located in the middle of the top of the sealing chamber.

[0009] Furthermore, the outer side of the upper cover is fixed with an edge, and a bolt is threaded between the edge and the mating edge. A locking nut is threaded on the outer side of the bolt and is tightly attached to the lower surface of the mating edge.

[0010] Furthermore, a sealing cavity one is formed on the upper low plane, and a sealing cavity two corresponding to the sealing cavity one is formed at the bottom of the upper cover, and a sealing strip is fitted between the sealing cavity one and the sealing cavity two.

[0011] Furthermore, the cross-sections of both the first and second sealing cavities are semi-circular.

[0012] Furthermore, a flange block is fixed to the bottom of the first sealing cavity and the top of the second sealing cavity, and a recessed notch corresponding to the two sets of flange blocks is opened on the outer side of the sealing strip, so that the flange block can be accommodated in the recessed notch.

[0013] Furthermore, the flange block at the bottom of the first sealing cavity is located in the middle of the first sealing cavity, and the flange block at the top of the second sealing cavity is located in the middle of the second sealing cavity.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. The sealing structure of this oil-immersed transformer forms a labyrinth-type sealing structure through the cooperation of high and low convex edges, mating notches and sealing strips, which effectively prevents external liquid intrusion and internal oil leakage.

[0015] 2. In further design, the sealing structure of this oil-immersed transformer is further improved by forming a double seal through sealing rubber strips and sealing strips, which further enhances the sealing reliability. Attached Figure Description

[0016] Figure 1 A schematic diagram of the sealing structure of an oil-immersed transformer provided for an embodiment of this utility model; Figure 2 for Figure 1 A cross-sectional structural diagram of the central protrusion and its connecting structure; Figure 3 for Figure 1 A cross-sectional view of the central sealing strip; Figure 4 for Figure 1 A partial structural diagram of the cross-section of the docking gap; Figure 5 for Figure 1 A cross-sectional view of the upper and middle covers and their connecting structures from the front. Figure 6 This is a partial structural diagram of an embodiment of the present invention with a flange block.

[0017] The attached diagram lists the components represented by each number as follows: 1. Oil-immersed transformer enclosure; 2. Butt joint edge; 21. High and low raised edges; 211. Upper high plane; 212. Upper low plane; 213. Raised edge; 214. Sealing cavity one; 3. Top cover; 31. Butt joint notch; 311. Butt joint chamber; 312. Sealing chamber; 313. Sealing flange; 32. Edge; 33. Sealing cavity two; 4. Sealing strip; 41. Accommodation notch; 42. Sealing notch; 5. Bolt; 6. Locking nut; 7. Sealing strip; 71. Recessed notch; 8. Flange block. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0019] like Figure 1 As shown, the sealing structure of an oil-immersed transformer in this embodiment includes an oil-immersed transformer housing 1, which is used to accommodate transformer components, such as upper and lower clamps, and structures such as transformer cores and coils disposed between the upper and lower clamps. The transformer components are existing technology and will not be described in detail here. A mating edge 2 is fixed on the oil-immersed transformer housing 1, and an upper cover 3 is detachably disposed on the mating edge 2.

[0020] like Figure 2-5 As shown, to enhance the sealing performance between the tank 1 and the top cover 3 of the oil-immersed transformer, it is necessary to seal the mating edge 2 and the top cover 3. Therefore, the sealing structure of the oil-immersed transformer is further designed. A high and low convex edge 21 is integrally connected to the mating edge 2. The high and low convex edge 21 has an upper high plane 211 and an upper low plane 212. A raised edge 213 is integrally connected to the upper high plane 211. A mating notch 31 is provided at the bottom of the top cover 3. The mating notch 31 includes a mating chamber 311 and a sealing chamber 312. After the top cover 3 is installed, the high and low protruding edge 21 is adapted to be located in the docking chamber 311. A sealing flange 313 is fixedly installed in the sealing chamber 312. The sealing structure of the oil-immersed transformer also includes a sealing strip 4. The sealing strip 4 is located in the sealing chamber 312. The bottom of the sealing strip 4 has a receiving notch 41. The protruding edge 213 is located in the receiving notch 41. The sealing strip 4 is snapped onto the outside of the protruding edge 213 through the receiving notch 41. The top of the sealing strip 4 has a sealing notch 42. The sealing flange 313 is snapped onto this sealing notch 42.

[0021] In addition, an edge 32 is fixed to the outer side of the top cover 3, and a bolt 5 is threaded between the edge 32 and the mating edge 2. A locking nut 6 is threaded to the outer side of the bolt 5, and the locking nut 6 is in close contact with the lower surface of the mating edge 2.

[0022] With this design, the high and low convex edges 21, the mating notch 31 and the sealing strip 4 form a labyrinth seal between the mating edge 2 and the top cover 3, which has excellent sealing performance. External rainwater is not easy to enter the oil-immersed transformer tank 1, and internal oil is not easy to leak from between the mating edge 2 and the top cover 3.

[0023] In addition, a semi-circular sealing cavity 214 is provided on the upper low plane 212, and a sealing cavity 33 corresponding to the sealing cavity 214 is provided at the bottom of the upper cover 3. A sealing strip 7 is fitted between the sealing cavity 214 and the sealing cavity 33.

[0024] Further design, such as Figure 6 As shown, a flange block 8 is fixed to the bottom of the sealing cavity 1 214 and the top of the sealing cavity 2 33. The outer side of the sealing strip 7 is provided with a recessed notch 71 corresponding to the two sets of flange blocks 8, so that the flange blocks 8 can be accommodated in the recessed notch 71. It should be noted that the flange block 8 at the bottom of the sealing cavity 1 214 is located in the middle of the sealing cavity 1 214, and the flange block 8 at the top of the sealing cavity 2 33 is located in the middle of the sealing cavity 2 33. In addition, after the top cover 3 is installed, both the sealing strip 4 and the sealing strip 7 are in a compressed state.

[0025] This design creates a second sealing point, achieving double sealing and further enhancing the sealing performance of the oil-immersed transformer's sealing structure.

[0026] In summary, the first seal is formed by the high and low convex edges 21, the mating notch 31, and the sealing strip 4, and a labyrinth seal is formed between the mating edge 2 and the top cover 3. In addition, the first sealing cavity 214, the second sealing cavity 33, the sealing strip 7, and the flange block 8 form a second seal, so that the sealing structure of the oil-immersed transformer forms a double seal with excellent sealing performance. External rainwater is not easy to enter the oil-immersed transformer tank 1, and internal oil is not easy to leak from the mating edge 2 and the top cover 3.

[0027] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A sealing structure for an oil-immersed transformer, characterized in that, It includes an oil-immersed transformer housing (1), a mating edge (2), a top cover (3), and a sealing strip (4). The mating edge (2) is fixed to the top of the oil-immersed transformer housing (1), and the top cover (3) is detachably connected to the mating edge (2). The mating edge (2) is integrally connected with a high and low convex edge body (21), and a raised edge (213) is integrally connected to the high and low convex edge body (21). The bottom of the upper cover (3) is provided with a docking notch (31), which includes a docking chamber (311) and a sealing chamber (312). The high and low convex body (21) is located in the docking chamber (311), and a sealing flange (313) is fixed in the sealing chamber (312). The sealing strip (4) is located in the sealing chamber (312). The bottom of the sealing strip (4) has a receiving notch (41), and the raised edge (213) is located in the receiving notch (41). The top of the sealing strip (4) has a sealing notch (42), and the sealing flange (313) is fitted in this sealing notch (42).

2. The sealing structure of an oil-immersed transformer according to claim 1, characterized in that: The high and low convex edge body (21) has an upper high plane (211) and an upper low plane (212), and the convex edge (213) is integrally connected to the upper high plane (211).

3. The sealing structure of an oil-immersed transformer according to claim 2, characterized in that: The sealing flange (313) is located in the middle of the top of the sealing chamber (312).

4. The sealing structure of an oil-immersed transformer according to claim 3, characterized in that: The outer side of the cover (3) is fixed with an edge (32), and a bolt (5) is threaded between the edge (32) and the mating edge (2). A locking nut (6) is threaded on the outer side of the bolt (5), and the locking nut (6) is close to the lower surface of the mating edge (2).

5. The sealing structure of an oil-immersed transformer according to claim 4, characterized in that: A sealing cavity 1 (214) is provided on the upper low plane (212), and a sealing cavity 2 (33) corresponding to the sealing cavity 1 (214) is provided at the bottom of the upper cover (3). A sealing strip (7) is installed between the sealing cavity 1 (214) and the sealing cavity 2 (33).

6. The sealing structure of an oil-immersed transformer according to claim 5, characterized in that: Both the first sealing cavity (214) and the second sealing cavity (33) have semi-circular cross sections.

7. The sealing structure of an oil-immersed transformer according to claim 6, characterized in that: The bottom of the first sealing cavity (214) and the top of the second sealing cavity (33) are each fixed with a flange block (8). The outer side of the sealing strip (7) is provided with a recessed notch (71) corresponding to the two sets of flange blocks (8), so that the flange block (8) can be accommodated in the recessed notch (71).

8. The sealing structure of an oil-immersed transformer according to claim 7, characterized in that: The flange block (8) at the bottom of the first sealing cavity (214) is located in the middle of the first sealing cavity (214), and the flange block (8) at the top of the second sealing cavity (33) is located in the middle of the second sealing cavity (33).

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