A type of bushing for American-style transformers

Abstract

This utility model relates to the field of American transformer technology, specifically a bushing for American transformers, including an oil tank cover plate. A gasket is fitted onto the oil tank cover plate, and a conductive rod is inserted into the gasket. A porcelain sleeve is fitted onto the conductive rod, and a sealing mechanism is fitted onto the bottom of the porcelain sleeve. The sealing mechanism includes retaining rings and protrusions. Two retaining rings are fitted onto the bottom end of the porcelain sleeve near the gasket, and the two retaining rings are engaged with each other. A gasket is fixed on each retaining ring, and a protrusion is fixedly installed at both ends of each retaining ring. Insert blocks are fitted onto the two sets of protrusions, and insert rods are fitted into the insert blocks and protrusions. Rotating blocks are threaded onto both ends of each insert rod. The retaining rings fit snugly against the bottom of the porcelain sleeve, ensuring that the retaining rings are stably embedded in the gaskets, forming a three-dimensional sealing interface. The gaskets fill the microscopic gaps between the retaining rings and the porcelain sleeve, enhancing the sealing effect and preventing leakage of the medium inside the bushing while also preventing external contaminants from entering.

Description

Technical Field

[0001] This utility model relates to a bushing, specifically a bushing for American-style transformers, belonging to the field of American-style transformer technology. Background Technology

[0002] In the operation of American-style transformers, bushings are key components, undertaking the important functions of conducting current and providing electrical insulation. The electrical energy of the high-voltage winding inside the transformer is conducted through the conductive rod to the external terminal at the top of the bushing, and then connected to the external high-voltage power grid, forming a current path. The conductive rod must have good conductivity and maintain reliable insulation from the insulating bushing body to prevent current leakage. The insulating bushing body isolates the high-voltage conductive rod from the transformer tank and the surrounding environment, using the high resistance characteristics of the insulating material to prevent current breakdown.

[0003] However, during the long-term operation of a transformer, electromagnetic vibrations and external mechanical impacts may cause the part where the bushing porcelain bushing and the gasket on the oil tank cover plate are engaged to loosen, resulting in a slight relative displacement between the bushing and the gasket. This can disrupt the tight seal between the sealing surfaces, leading to oil leakage in the transformer tank. Furthermore, the intrusion of external moisture and impurities can reduce insulation performance and even cause equipment failure. Utility Model Content

[0004] The purpose of this utility model is to provide a special bushing for American-style transformers in order to solve the above problems. The retaining ring fits snugly to the bottom of the porcelain bushing, ensuring that the retaining ring is stably embedded in the gasket to form a three-dimensional sealing interface. The gasket fills the microscopic gap between the retaining ring and the porcelain bushing, enhancing the sealing effect. This not only prevents the leakage of the medium inside the bushing, but also prevents external contaminants from entering.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a bushing for American-style transformers, comprising an oil tank cover plate, a washer fitted onto the oil tank cover plate, a conductive rod inserted into the washer, a porcelain sleeve fitted onto the conductive rod, a sealing mechanism fitted onto the bottom of the porcelain sleeve, the sealing mechanism comprising retaining rings and protrusions, two retaining rings fitted onto the bottom end of the porcelain sleeve near the washer, the two retaining rings being fitted together, a washer fixed onto the retaining ring, and protrusions fixedly installed at both ends of the retaining ring, insert blocks fitted onto the two sets of protrusions, insert rods fitted into the insert blocks and protrusions, and rotating blocks threaded onto both ends of the insert rods.

[0006] Preferably, the retaining ring is arranged with an arc surface structure, the gasket contacts the ceramic sleeve, and the width of the insert is greater than the width of the two protrusions.

[0007] Preferably, the sealing mechanism further includes a groove, and the gasket is provided with a groove near the bottom end of the ceramic sleeve. The groove is arranged in a ring structure, and a retaining ring is engaged with the groove.

[0008] Preferably, a bead is fitted onto the conductive rod near the top of the ceramic sleeve, and the part of the ceramic sleeve that contacts the bead has an arc-shaped structure.

[0009] Preferably, a ceramic ring is engaged with the part of the conductive rod near the top of the adhesive bead, and a set of limiting blocks abut against the ceramic ring.

[0010] Preferably, each of the limiting blocks is threadedly connected to the conductive rod, and a terminal block is installed between the two sets of limiting blocks.

[0011] Preferably, the terminal block is sleeved on the side wall of the conductive rod, and the terminal block is located on the conductive rod near the ceramic ring.

[0012] Preferably, a retaining plate is engaged with the conductive rod near the bottom of the washer, and the retaining plate abuts against the washer.

[0013] Preferably, a positioning block is threadedly installed on the part of the conductive rod near the abutment, the positioning block is arranged in a regular hexagonal structure, and the positioning block abuts against the abutment.

[0014] The beneficial effects of this utility model are as follows: Two retaining rings are used to engage along the arc surface of the bottom end of the ceramic sleeve, ensuring that the gasket on the retaining ring is in close contact with the surface of the ceramic sleeve. During installation, the elastic deformation of the gasket can be felt by pressing the retaining ring by hand to ensure that the two fit together. The gasket contacts the ceramic sleeve, and its elastic deformation fills the tiny gaps between the retaining ring and the ceramic sleeve, further enhancing the sealing effect and preventing the retaining ring from causing wear to the surface of the ceramic sleeve. When the ends of the two retaining rings are in contact, the protrusions fixed at both ends of the retaining rings also abut together, allowing the insert to be inserted into the two sets of protrusions. This ensures that the insert completely covers the protrusions, and the width of the insert is greater than the combined width of the two protrusions, thereby ensuring a stable wrapping of the protrusions. Then insert the insertion rod, allowing it to pass through the inner wall of the insertion block and the protrusion. Screw the rotating blocks into both ends of the insertion rod and slowly rotate the rotating blocks by hand until they are tight. The rotating blocks can tighten the retaining rings by tightening them, so that the two retaining rings fit tightly together, ensuring the stability of the sealing assembly and facilitating installation, disassembly and maintenance. Align the bottom end of the porcelain bushing with the assembled retaining rings with the inside of the washer, and slowly press down on the porcelain bushing to make the retaining rings snap into place. This completes the initial positioning of the porcelain bushing. The two arc-shaped retaining rings cooperate with the washer to tightly wrap the bottom of the porcelain bushing, increasing the contact area between the porcelain bushing and the washer, forming a ring seal, and effectively preventing transformer oil leakage and the intrusion of external impurities. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the connection structure between the conductive rod and the terminal block of this utility model;

[0017] Figure 3 for Figure 2 The diagram shown is an enlarged view of the structure of part A.

[0018] Figure 4 This is a schematic diagram of the connection structure between the conductive rod and the ceramic sleeve of this utility model;

[0019] Figure 5 This is a schematic diagram of the connection structure between the washer and the abutment of this utility model;

[0020] Figure 6 This is a schematic diagram of the connection structure between the conductive rod and the positioning block of this utility model.

[0021] In the diagram: 1. Fuel tank cover; 2. Washer; 3. Sealing mechanism; 301. Snap ring; 302. Insert block; 303. Insert rod; 304. Rotating block; 305. Protrusion; 306. Gasket; 307. Slot; 4. Porcelain sleeve; 5. Porcelain ring; 6. Limiting block; 7. Conductive rod; 8. Terminal block; 9. Adhesive bead; 10. Positioning block; 11. Abutment. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-6As shown, a bushing for an American-style transformer includes an oil tank cover plate 1. A washer 2 is snapped onto the oil tank cover plate 1. A conductive rod 7 is inserted into the washer 2. A porcelain sleeve 4 is sleeved onto the conductive rod 7. A sealing mechanism 3 is snapped onto the bottom of the porcelain sleeve 4. The sealing mechanism 3 includes retaining rings 301 and protrusions 305. Two retaining rings 301 are snapped onto the bottom end of the porcelain sleeve 4 near the washer 2. The two retaining rings 301 are snapped together. A gasket 306 is fixed on the retaining ring 301. Protrusions 305 are fixedly installed at both ends of the retaining ring 301. Insert blocks 302 are snapped onto the two sets of protrusions 305. Insert rods 303 are snapped onto the insert blocks 302 and protrusions 305. Both ends of 03 are threaded with rotating blocks 304. The retaining ring 301 is arranged with an arc surface structure. The gasket 306 contacts the ceramic sleeve 4. The width of the insert block 302 is greater than the width of the two protrusions 305. The washer 2 is provided with a groove 307 near the bottom of the ceramic sleeve 4. The groove 307 is arranged with an annular structure, and the retaining ring 301 is engaged in the groove 307. When the ends of the two retaining rings 301 are in contact, the protrusions 305 fixed at both ends of the retaining rings 301 also abut together, so that the insert block 302 is inserted into the two sets of protrusions 305, ensuring that the insert block 302 completely covers the protrusions 305. The width of the insert block 302 is greater than the width of the two protrusions 305 together, thereby ensuring stable wrapping of the protrusions 305.

[0024] As a technical optimization of this utility model, a bead 9 is fitted onto the part of the conductive rod 7 near the top of the ceramic sleeve 4. The part of the ceramic sleeve 4 that contacts the bead 9 has an arc-shaped structure. A ceramic ring 5 is fitted onto the part of the conductive rod 7 near the top of the bead 9. A set of limiting blocks 6 abuts on the ceramic ring 5. The arc-shaped structure design of the part of the ceramic ring 5 that contacts the bead 9 allows for better fit with the bead 9, improving the sealing and insulation of the top.

[0025] As a technical optimization of this utility model, the limiting blocks 6 are all threadedly connected to the conductive rods 7, and a terminal block 8 is installed between the two sets of limiting blocks 6. The terminal block 8 is sleeved on the side wall of the conductive rod 7, and the terminal block 8 is located on the conductive rod 7 near the ceramic ring 5. The upper end of the sleeve is connected to the busbar, cable or overhead line of the external high-voltage power grid through the terminal block 8, so as to transmit the high-voltage power output of the transformer to the power grid and complete the output of power.

[0026] As a technical optimization of this utility model, a stop piece 11 is engaged and installed on the part of the conductive rod 7 near the bottom end of the washer 2. The stop piece 11 abuts against the washer 2. A positioning block 10 is threadedly installed on the part of the conductive rod 7 near the stop piece 11. The positioning block 10 is arranged in a regular hexagonal structure and abuts against the stop piece 11. The positioning block 10 is screwed in and rotated with a wrench so that the positioning block 10 abuts against the stop piece 11, thereby tightening the bottom end of the conductive rod 7 and ensuring that the conductive rod 7 does not move up and down.

[0027] In use, this utility model first aligns the washer 2 with the mounting groove on the tank cover plate 1, and slowly engages it, ensuring that the washer 2 is fully fitted to the mounting groove without any looseness or misalignment. The washer 2 engages with the tank cover plate 1, providing a mounting base for the porcelain bushing 4 and the conductive rod 7. Furthermore, its own material's sealing properties assist the retaining ring 301 in enhancing the overall sealing performance at the connection between the tank cover plate 1 and the porcelain bushing 4, reducing the risk of transformer oil leakage. Next, two retaining rings 301 are taken and engaged along the arc surface of the bottom end of the porcelain bushing 4, ensuring that the gasket 306 on the retaining ring 301 is in close contact with the surface of the porcelain bushing 4. During installation, the elastic deformation of the gasket 306 can be felt by pressing the retaining ring 301 to ensure a proper fit. The gasket 306 contacts the porcelain bushing 4, using its elastic deformation to fill the gap left by the retaining ring 306. The tiny gap between 01 and the porcelain sleeve 4 further enhances the sealing effect while preventing the retaining ring 301 from causing wear on the surface of the porcelain sleeve 4. When the ends of the two retaining rings 301 contact, the protrusions 305 fixed at both ends of the retaining rings 301 also abut together, inserting the insert block 302 into the two sets of protrusions 305, ensuring that the insert block 302 completely covers the protrusions 305. The width of the insert block 302 is greater than the width of the two protrusions 305 together, thus ensuring a stable wrapping of the protrusions 305. Then, the insert rod 303 is inserted, passing through the inner wall of the insert block 302 and the protrusions 305. The rotating block 304 is screwed into both ends of the insert rod 303. The rotating block 304 is slowly rotated by hand until it is tight. The rotating block 304 can tighten the retaining ring 301 by tightening it, so that the two retaining rings The 301 rings fit tightly, ensuring the stability of the sealing assembly and facilitating installation, disassembly, and maintenance. The bottom end of the porcelain sleeve 4, with the retaining ring 301 assembled, is aligned with the groove 307 inside the washer 2. The porcelain sleeve 4 is slowly pressed down, causing the retaining ring 301 to engage with the groove 307, thus completing the initial positioning of the porcelain sleeve 4. The two arc-shaped retaining rings 301, in conjunction with the annular groove 307, tightly wrap around the bottom of the porcelain sleeve 4, increasing the contact area with the porcelain sleeve 4 and the washer 2, initially forming an annular seal, effectively preventing transformer oil leakage and the intrusion of external impurities. Then, the conductive rod 7 is inserted from the top of the porcelain sleeve 4, with the porcelain sleeve 4 fitted onto the conductive rod 7, effectively preventing current leakage and ensuring the electrical safety of the transformer operation. The conductive rod 7 passes through the washer 2, ensuring that the conductive rod 7 is in a position... With the conductive rod 7 in a vertical, straight position, after the bottom end of the conductive rod 7 extends an appropriate length beyond the washer 2, the abutment 11 can be snapped into place at its bottom end. The abutment 11 is located near the bottom end of the conductive rod 7, so that the abutment 11 contacts the surface of the washer 2, initially supporting the conductive rod 7. Next, the positioning block 10 is screwed in, and the positioning block 10 is rotated with a wrench so that the positioning block 10 contacts the abutment 11, thereby tightening the bottom end of the conductive rod 7 and ensuring that the conductive rod 7 does not move up and down. The adhesive bead 9 is picked up with tweezers and snapped into the arc-shaped part of the conductive rod 7 near the top of the ceramic sleeve 4. The adhesive bead 9 is gently pressed to make it fit tightly against the ceramic sleeve 4, which facilitates the subsequent installation of the ceramic ring 5. The arc-shaped structure design of the contact part between the ceramic ring 5 and the adhesive bead 9 can better fit with the adhesive bead 9, improving the sealing and insulation of the top.Screw in the limiting block 6 so that it abuts against the ceramic ring 5, ensuring a tight fit between the ceramic ring 5 and the adhesive bead 9. Finally, attach the terminal block 8 to the conductive rod 7 near the limiting block 6, ensuring good contact between the terminal block 8 and the conductive rod 7. Then, use another limiting block 6 to fix and limit its position. During the use of the high-voltage bushing, the high-voltage winding lead-out from the transformer tank connects to the conductive rod 7 inside the high-voltage bushing, transferring the high voltage generated by the winding to the conductive rod 7. The ceramic sleeve 4 surrounding the conductive rod 7 can withstand the high voltage difference between the winding and the tank, and also improves the electric field distribution, preventing excessive local electric field strength that could lead to insulation breakdown. The upper end of the bushing connects to the busbar, cable, or overhead line of the external high-voltage power grid via the terminal block 8, transferring the high-voltage electrical energy output from the transformer to the power grid, thus completing the power output.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bushing for American transformers comprising an oil tank cover plate (1), characterized in that: A gasket (2) is fitted onto the oil tank cover (1). A conductive rod (7) is inserted into the gasket (2). A ceramic sleeve (4) is fitted onto the conductive rod (7). A sealing mechanism (3) is fitted onto the bottom of the ceramic sleeve (4). The sealing mechanism (3) includes a retaining ring (301) and a protrusion (305). Two retaining rings (301) are fitted onto the bottom end of the ceramic sleeve (4) near the gasket (2). The two retaining rings (301) are fitted together. A gasket (306) is fixed on the retaining ring (301). A protrusion (305) is fixedly installed on both ends of the retaining ring (301). An insert block (302) is fitted onto the two sets of protrusions (305). An insert rod (303) is fitted onto the insert block (302) and the protrusion (305). A rotating block (304) is threaded onto both ends of the insert rod (303).

2. A bushing for a transformer of the American type according to claim 1, characterized in that: The retaining ring (301) is arranged in an arc-shaped structure, the gasket (306) contacts the ceramic sleeve (4), and the width of the insert (302) is greater than the width of the two protrusions (305).

3. A bushing for a transformer of the American type according to claim 1, characterized in that: The sealing mechanism (3) further includes a groove (307). The gasket (2) is provided with a groove (307) near the bottom of the ceramic sleeve (4). The groove (307) is arranged in a ring structure, and a retaining ring (301) is engaged and installed in the groove (307).

4. The bushing for American-style transformers according to claim 1, characterized in that: The conductive rod (7) is fitted with a bead (9) near the top of the ceramic sleeve (4), and the part of the ceramic sleeve (4) that contacts the bead (9) has an arc-shaped structure.

5. A bushing for American-style transformers according to claim 4, characterized in that: The conductive rod (7) is engaged with a ceramic ring (5) near the top of the adhesive bead (9), and a set of limiting blocks (6) are abutted on the ceramic ring (5).

6. A bushing for American-style transformers according to claim 5, characterized in that: The limiting blocks (6) are all threadedly connected to the conductive rods (7), and terminals (8) are installed between the two sets of limiting blocks (6).

7. A bushing for American-style transformers according to claim 6, characterized in that: The terminal block (8) is sleeved on the side wall of the conductive rod (7), and the terminal block (8) is located on the conductive rod (7) near the ceramic ring (5).

8. A bushing for American-style transformers according to claim 1, characterized in that: The conductive rod (7) is fitted with a stop piece (11) near the bottom of the washer (2), and the stop piece (11) abuts against the washer (2).

9. A bushing for American-style transformers according to claim 8, characterized in that: A positioning block (10) is threadedly installed on the part of the conductive rod (7) near the abutment (11). The positioning block (10) is arranged in a regular hexagonal structure and abuts the abutment (11).

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