High-voltage hand-hole-opening-free type transformer bushing structure

Abstract

The utility model discloses a high-voltage hand-hole-opening-free type transformer bushing structure which comprises an upper conducting rod, a capacitor core and a porcelain bushing which are sequentially and coaxially arranged from inside to outside, the top of the capacitor core is concentrically and coaxially sleeved with a supporting cap, the supporting cap is in limiting fit with the top of the upper conducting rod through a fixing pin, and the upper conducting rod is sleeved with the porcelain bushing. One side of the supporting cap is in equipotential connection with the capacitor core through a lead, the top of the porcelain bushing is detachably provided with a voltage-sharing sealing cover, and the voltage-sharing sealing cover is in sealing fit with the porcelain bushing and the supporting cap through sealing rings. A third metal gasket, a second metal gasket and a first metal gasket are sequentially and detachably arranged at the top of the pressure-equalizing sealing cover in the axial direction, the upper conducting rod sequentially penetrates through the third metal gasket, the second metal gasket and the first metal gasket and is in sealing fit with the third metal gasket, the second metal gasket and the first metal gasket through sealing rings, and a lower conducting rod is detachably and coaxially arranged at the tail of the upper conducting rod; the installation stability is ensured, and meanwhile, hand hole opening-free installation is conveniently achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer supporting electrical equipment, in particular to a high voltage transformer bushing structure free of handholes. Background Art

[0002] The bushing is a device that connects the internal leads of the transformer to the external high-voltage wires, and plays the role of mechanical support, current carrying, sealing and ground insulation.

[0003] For guide-rod transformer bushings, a handhole is typically required in the side wall of the transformer housing to facilitate connection of the oil end of the bushing to the transformer. This creates a leakage point for the transformer and increases maintenance costs. For high-voltage bushings with longer dimensions and larger diameters, there may be insufficient space in the transformer housing to accommodate them when the transformer is compact.

[0004] At the same time, the traditional casing may be displaced when installed horizontally, resulting in damage to the sealing performance, and the entire device and the casing assembly are inconvenient to install and disassemble.

[0005] Based on the above phenomenon, there is an urgent need for a high-voltage hand-hole-free transformer bushing that does not require side holes to be opened on the transformer box. Utility Model Content

[0006] The utility model provides a high voltage transformer bushing structure without opening a hand hole, aiming to solve the problems that the existing rod-type transformer bushing needs to open a hand hole for installation, the sealing may be damaged, and the installation and disassembly are inconvenient.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A high-voltage transformer bushing structure without a handhole, comprising an upper conductive rod, a capacitor core and a porcelain sleeve coaxially arranged from the inside to the outside, the top of the capacitor core being concentrically and coaxially sleeved with a support cap, the support cap forming a limit fit with the top of the upper conductive rod through a fixing pin, and one side of the support cap forming an equipotential connection with the capacitor core through a lead, the top of the porcelain sleeve being detachably provided with a pressure-equalizing sealing cover, the pressure-equalizing sealing cover forming a sealing fit with the porcelain sleeve and the support cap through a sealing ring, the top of the pressure-equalizing sealing cover being detachably provided with a third metal washer, a second metal washer and a first metal washer in sequence along the axial direction, the upper conductive rod sequentially passes through the third metal washer, the second metal washer and the first metal washer, and the upper conductive rod and the third metal washer, the second metal washer and the first metal washer are all sealed through the sealing ring, the tail of the upper conductive rod being detachably coaxially provided with a lower conductive rod.

[0009] Preferably, a flange is coaxially provided on the outside of the middle bottom of the capacitor core, and the porcelain sleeve is coaxially sleeved on the outside of the capacitor core. The bottom of the porcelain sleeve is detachably fixed with the flange through a fourth bolt, and an insulating medium is filled between the porcelain sleeve and the capacitor core.

[0010] More preferably, the flange is provided with a measuring terminal.

[0011] Furthermore, a support cap is concentrically and coaxially sleeved on the top of the capacitor core, and an adhesive is provided between the inner wall of the support cap and the outer wall of the top of the capacitor core. The support cap is bonded and fixed to the capacitor core through the adhesive, and a sixth sealing ring is provided between the inner wall of the support cap and the outer wall of the capacitor core. The support cap is sealed to the capacitor core through the sixth sealing ring.

[0012] Furthermore, the support cap extends axially toward a side away from the capacitor core to form an extension portion, and the extension portion of the support cap is provided with a radially arranged fixing pin, which axially penetrates the support cap and is embedded in the upper conductive rod.

[0013] Specifically, the top of the porcelain sleeve is coaxially fixed with the pressure-equalizing sealing cover by a third bolt, the bottom end face of the pressure-equalizing sealing cover is provided with a second sealing ring, and the bottom of the pressure-equalizing sealing cover forms a sealing fit with the top of the porcelain sleeve through the second sealing ring, the extension part of the support cap passes through the pressure-equalizing sealing cover, and a fifth sealing ring is provided at the penetration point of the pressure-equalizing sealing cover, and the support cap forms a sealing fit with the pressure-equalizing sealing cover through the fifth sealing ring.

[0014] More specifically, spring contact fingers are coaxially and concentrically provided inside the pressure-equalizing sealing cover, and the spring contact fingers surround the outer wall of the supporting cap.

[0015] Specifically, a third metal washer is coaxially and concentrically provided on the top of the pressure-equalizing sealing cover via a second bolt, a first sealing ring is provided on the bottom end surface of the third metal washer, the third metal washer forms a sealing fit with the pressure-equalizing sealing cover via the first sealing ring, and the top of the support cap is embedded in the third metal washer without penetrating therethrough;

[0016] A second metal washer is coaxially and concentrically provided on the top of the third metal washer through the first bolt, a fourth sealing ring is provided on the bottom end surface of the second metal washer, and the second metal washer forms a sealing fit with the third metal washer through the fourth sealing ring, a third sealing ring is provided in the inner hole wall of the second metal washer, and the second metal washer forms a sealing fit with the upper conductive rod through the third sealing ring;

[0017] A first metal washer is provided on the top of the second metal washer through a first screw, a third sealing ring is provided in the inner hole wall of the first metal washer, and the first metal washer forms a sealing fit with the upper conductive rod through the third sealing ring.

[0018] In more detail, the second metal washer is detachably provided with a fastener, and the second metal washer forms a compression-locking fit with the upper conductive rod through the fastener.

[0019] Preferably, the upper conductive rod and the lower conductive rod are concentrically and coaxially socket-fitted, and the socket-fitted portion is locked by a second screw.

[0020] Beneficial effects of the utility model:

[0021] 1. This bushing has a simple structure and is easy to operate, which reduces the cost of bushing replacement and maintenance costs. This bushing can be designed while ensuring that the size of the lower conductive rod remains unchanged on site. When replacing on site, the lower conductive rod and the transformer are already connected and fixed. In this case, you only need to reach into the transformer oil tank with a special tool without removing the lower conductive rod and fix the upper conductive rod to the lower conductive rod with screws.

[0022] 2. This structure uses a conductive rod that extends directly, which reduces the production cost of the bushing while ensuring reliable connection and operation of the bushing;

[0023] 3. This type of casing uses a support cap as a transition structure to facilitate the installation of the casing assembly. It also ensures sealing effect through multi-stage sealing, fixes the position of the conductive rod, and uses spring contacts and leads to achieve equal potential, thus achieving highly reliable operation and preventing the occurrence of false connections.

[0024] 4. The bushing design of this structure can reduce costs while not only solving the problem that the bushing size should not be too thick due to the compact size of high-voltage transformers, but also solving the risk of an additional leakage point caused by opening a side hole on the transformer box. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial cross-sectional front view of the utility model;

[0026] Figure 2 This is an enlarged schematic cross-sectional view of the mounting location of the support cap of the present invention;

[0027] In the figure: 1. First metal washer; 2. Second metal washer; 3. Fastener; 4. Third metal washer; 5. Fixing pin; 6. Support cap; 7. Pressure-equalizing sealing cover; 8. Insulating medium; 9. Lead wire; 10. Porcelain sleeve; 11. First screw; 12. First bolt; 13. Second bolt; 14. First sealing ring; 15. Third bolt; 16. Second sealing ring; 17. Third sealing ring; 18. Fourth sealing ring; 19. Fifth sealing ring; 20. Adhesive; 21. Sixth sealing ring; 22. Spring contact finger; 23. Flange; 24. Measuring terminal; 25. Upper conductive rod; 26. Lower conductive rod; 27. Capacitor core; 28. Second screw; 29. ​​Fourth bolt. DETAILED DESCRIPTION

[0028] As follows, embodiments are further described with reference to the accompanying drawings.

[0029] like Figure 1~Figure 2 As shown, as a preferred embodiment 1, a high-voltage transformer bushing structure without a handhole is provided, comprising an upper conductive rod 25, a capacitor core 27 and a porcelain sleeve 10 coaxially arranged from the inside to the outside, the top of the capacitor core 27 is concentrically and coaxially sleeved with a support cap 6, the support cap 6 forms a limited fit with the top of the upper conductive rod 25 through a fixing pin 5, and one side of the support cap 6 forms an equipotential connection with the capacitor core 27 through a lead 9, the top of the porcelain sleeve 10 is detachably provided with a pressure-equalizing sealing cover 7, the pressure-equalizing sealing cover 7 forms a sealing fit with the porcelain sleeve 10 and the support cap 6 through a sealing ring, and the support cap 6 is sealed. Perform the transition, connect the various components, and use the lead 9 to connect the support cap 6 and the residual capacitor core 27 to the same potential. The top of the pressure-equalizing sealing cover 7 is detachably provided with a third metal washer 4, a second metal washer 2 and a first metal washer 1 in the axial direction. The upper conductive rod 25 passes through the third metal washer 4, the second metal washer 2 and the first metal washer 1 in sequence, and the upper conductive rod 25 and the third metal washer 4, the second metal washer 2 and the first metal washer 1 are all sealed through the sealing ring. The tail of the upper conductive rod 25 is detachably coaxially provided with a lower conductive rod 26, and adopts a split structure, which is convenient for installation and disassembly without opening a hand hole.

[0030] A flange 23 is coaxially and concentrically provided on the outside of the middle and bottom of the capacitor core 27. The porcelain sleeve 10 is coaxially and concentrically sleeved on the outside of the capacitor core 27. The bottom of the porcelain sleeve 10 is detachably fixed with the flange 23 through a fourth bolt 29. An insulating medium 8 is filled between the porcelain sleeve 10 and the capacitor core 27 to ensure the fixed installation of the porcelain sleeve 10.

[0031] The flange 23 is provided with a measuring terminal 24 for easy measurement.

[0032] A support cap 6 is concentrically and coaxially sleeved on the top of the capacitor core 27, and an adhesive 20 is provided between the inner wall of the support cap 6 and the outer wall of the top of the capacitor core 27. The support cap 6 is bonded and fixed with the capacitor core 27 through the adhesive 20, and a sixth sealing ring 21 is provided between the inner wall of the support cap 6 and the outer wall of the capacitor core 27. The support cap 6 is sealed with the capacitor core 27 through the sixth sealing ring 21 to ensure fixed installation and sealing effect.

[0033] The support cap 6 extends axially toward the side away from the capacitor core 27 to form an extension portion, and a radially arranged fixing pin 5 is provided on the extension portion of the support cap 6. The fixing pin 5 axially penetrates the support cap 6 and is embedded in the upper conductive rod 25 to facilitate fixing and positioning the position of the upper conductive rod 25.

[0034] The top of the porcelain sleeve 10 is coaxially fixed with the pressure-equalizing sealing cover 7 by a third bolt 15. The bottom end face of the pressure-equalizing sealing cover 7 is provided with a second sealing ring 16, and the bottom of the pressure-equalizing sealing cover 7 forms a sealing fit with the top of the porcelain sleeve 10 through the second sealing ring 16. The extension of the support cap 6 passes through the pressure-equalizing sealing cover 7, and a fifth sealing ring 19 is provided at the penetration point of the pressure-equalizing sealing cover 7. The support cap 6 forms a sealing fit with the pressure-equalizing sealing cover 7 through the fifth sealing ring 19 to ensure the sealing effect.

[0035] The pressure-equalizing sealing cover 7 is coaxially and concentrically provided with spring contact fingers 22 , and the spring contact fingers 22 surround the outer wall of the support cap 6 to ensure that the pressure-equalizing sealing cover 7 is tightly installed.

[0036] The top of the pressure-equalizing sealing cover 7 is coaxially and concentrically provided with a third metal washer 4 via a second bolt 13. The bottom end surface of the third metal washer 4 is provided with a first sealing ring 14. The third metal washer 4 forms a sealing fit with the pressure-equalizing sealing cover 7 through the first sealing ring 14. The top of the support cap 6 is embedded in the third metal washer 4 without penetrating through it.

[0037] A second metal washer 2 is coaxially and concentrically provided on the top of the third metal washer 4 via a first bolt 12. A fourth sealing ring 18 is provided on the bottom end surface of the second metal washer 2. The second metal washer 2 forms a sealed fit with the third metal washer 4 via the fourth sealing ring 18. A third sealing ring 17 is provided in the inner hole wall of the second metal washer 2. The second metal washer 2 forms a sealed fit with the upper conductive rod 25 via the third sealing ring 17.

[0038] A first metal washer 1 is provided on the top of the second metal washer 2 through a first screw 11 , and a third sealing ring 17 is provided in the inner hole wall of the first metal washer 1 . The first metal washer 1 forms a sealed fit with the upper conductive rod 25 through the third sealing ring 17 .

[0039] The top of the device is sealed axially through a step-by-step sealing structure to enhance the sealing effect.

[0040] The second metal washer 2 is detachably provided with a fastener 3, and the second metal washer 2 forms a compression-locking fit with the upper conductive rod 25 through the fastener 3, which facilitates locking the upper conductive rod 25 and prevents the conductive rod from loosening.

[0041] The upper conductive rod 25 and the lower conductive rod 26 are concentrically and coaxially socket-fitted, and the socket-fitted portion is locked by a second screw 28, which facilitates installation and disassembly and facilitates installation without drilling holes.

[0042] The working principle of this utility model:

[0043] This device is connected to each component through the support cap 6, and the lead 9 is used to connect the support cap 6 and the residual capacitor core 27 with the same potential, which is convenient for use and installation, and further ensures the firmness and stability of the installation to prevent false connection. Multi-stage sealing is performed through the pressure-equalizing sealing cover 7, the third metal gasket 4, the second metal gasket 2 and the first metal gasket 1 to ensure the sealing effect. The tail of the internal upper conductive rod 25 is detachably coaxially provided with a lower conductive rod 26, and adopts a split structure, which is convenient for installation and disassembly without opening a hand hole.

[0044] A sixth sealing ring 21 is provided inside the support cap 6 and fixed to the capacitor core 27 via an adhesive 20. After being fixed, the support cap 6 and the capacitor core 27 are connected to the same potential via a lead 9. The flange 23 is fixed to the capacitor core 27. The porcelain sleeve 10 and the flange 23 are fixed by a fourth bolt 29. A second sealing ring 16, two fifth sealing rings 19, and a spring contact finger 22 are provided on the pressure-equalizing sealing cover 7. The pressure-equalizing sealing cover 7 is fixed by a third bolt 15. An insulating medium 8 is filled inside the porcelain sleeve 10 and the capacitor core 27. Finally, the measuring terminal 24 is mounted on the flange 23. The above parts form a whole bushing (hereinafter referred to as the "bushing component").

[0045] Fix the lower conductive rod 26 and the upper conductive rod 25 with the screw 2 with serial number 28, align the through hole on the upper conductive rod 25 with the through hole on the support cap 6, and then insert the fixing pin 5; then set a first sealing ring 14 at the end of the pressure-equalizing sealing cover 7, and fix the third metal washer 4 with the second bolt 13; then lock the upper conductive rod 25 with the fastener 3, and then insert a third sealing ring 17 in the axial direction of the conductive rod, and insert a fourth sealing ring 18 at the end of the second metal washer 2, and fix the second metal washer 2 and the third metal washer 4 with the first bolt 12; insert a third sealing ring 17 in the axial direction of the conductive rod, and fix the first metal washer 1 to the second metal washer 2 with the first screw 11.

[0046] During on-site installation, fix the lower conductive rod 26 inside the transformer, insert it into the transformer oil tank through a special tool, fix it to the upper conductive rod 25 through the second screw 28, drop the bushing component as a whole on the transformer oil tank, align the through hole on the upper conductive rod 25 with the through hole on the support cap 6, and then insert the fixing pin 5; the remaining steps are the same as the assembly steps.

Claims

1. A high voltage transformer bushing structure without opening a handhole, comprising an upper conductive rod (25), a capacitor core (27) and a porcelain sleeve (10) coaxially arranged from the inside to the outside, characterized in that: The top of the capacitor core (27) is concentrically and coaxially sleeved with a support cap (6), the support cap (6) forms a limited fit with the top of the upper conductive rod (25) through a fixing pin (5), and one side of the support cap (6) forms an equipotential connection with the capacitor core (27) through a lead (9), and the top of the porcelain sleeve (10) is detachably provided with a pressure-equalizing sealing cover (7), the pressure-equalizing sealing cover (7) forms a sealing fit with the porcelain sleeve (10) and the support cap (6) through a sealing ring, and the pressure-equalizing sealing cover (7) A third metal washer (4), a second metal washer (2) and a first metal washer (1) are detachably provided on the top in sequence along the axial direction. The upper conductive rod (25) passes through the third metal washer (4), the second metal washer (2) and the first metal washer (1) in sequence, and the upper conductive rod (25) and the third metal washer (4), the second metal washer (2) and the first metal washer (1) are all sealed by a sealing ring. A lower conductive rod (26) is detachably provided coaxially at the tail of the upper conductive rod (25).

2. The high voltage transformer bushing structure without handholes according to claim 1, characterized in that: A flange (23) is coaxially and concentrically provided on the outside of the middle and bottom portion of the capacitor core (27). The porcelain sleeve (10) is coaxially and concentrically sleeved on the outside of the capacitor core (27). The bottom of the porcelain sleeve (10) is detachably fixedly fitted with the flange (23) via a fourth bolt (29). An insulating medium (8) is filled between the porcelain sleeve (10) and the capacitor core (27).

3. The high voltage transformer bushing structure without handholes according to claim 2, characterized in that: A measuring terminal (24) is provided on the flange (23).

4. The high voltage transformer bushing structure without handholes according to claim 3, characterized in that: A support cap (6) is coaxially and concentrically sleeved on the top of the capacitor core (27); an adhesive (20) is provided between the inner wall of the support cap (6) and the outer wall of the top of the capacitor core (27); the support cap (6) and the capacitor core (27) are bonded and fixed together by the adhesive (20); and a sixth sealing ring (21) is provided between the inner wall of the support cap (6) and the outer wall of the capacitor core (27); the support cap (6) and the capacitor core (27) are sealed together by the sixth sealing ring (21).

5. The high voltage transformer bushing structure without handholes according to claim 4, characterized in that: The support cap (6) extends axially toward a side away from the capacitor core (27) to form an extension portion, and a radially arranged fixing pin (5) is provided on the extension portion of the support cap (6). The fixing pin (5) penetrates the support cap (6) axially and is then embedded in the upper conductive rod (25).

6. The high voltage transformer bushing structure without handholes according to claim 5, characterized in that: The top of the porcelain sleeve (10) is fixedly mounted coaxially with the pressure-equalizing sealing cover (7) by a third bolt (15); a second sealing ring (16) is provided on the bottom end face of the pressure-equalizing sealing cover (7); and the bottom of the pressure-equalizing sealing cover (7) forms a sealing fit with the top of the porcelain sleeve (10) through the second sealing ring (16); an extension of the support cap (6) passes through the pressure-equalizing sealing cover (7), and a fifth sealing ring (19) is provided at the position where the pressure-equalizing sealing cover (7) is passed through; and the support cap (6) forms a sealing fit with the pressure-equalizing sealing cover (7) through the fifth sealing ring (19).

7. The high voltage transformer bushing structure without handholes according to claim 6, characterized in that: A spring contact finger (22) is coaxially and concentrically provided inside the pressure-equalizing sealing cover (7), and the spring contact finger (22) surrounds the outer wall of the support cap (6).

8. The high voltage transformer bushing structure without handholes according to claim 7, characterized in that: The top of the pressure-equalizing sealing cover (7) is coaxially and concentrically provided with a third metal washer (4) via a second bolt (13); the bottom end surface of the third metal washer (4) is provided with a first sealing ring (14); the third metal washer (4) forms a sealing fit with the pressure-equalizing sealing cover (7) via the first sealing ring (14); the top of the support cap (6) is embedded in the third metal washer (4) without penetrating through it; A second metal washer (2) is coaxially and concentrically provided on the top of the third metal washer (4) via a first bolt (12); a fourth sealing ring (18) is provided on the bottom end face of the second metal washer (2); the second metal washer (2) forms a sealing fit with the third metal washer (4) via the fourth sealing ring (18); a third sealing ring (17) is provided in the inner hole wall of the second metal washer (2); the second metal washer (2) forms a sealing fit with the upper conductive rod (25) via the third sealing ring (17); A first metal washer (1) is provided on the top of the second metal washer (2) via a first screw (11), a third sealing ring (17) is provided in the inner hole wall of the first metal washer (1), and the first metal washer (1) forms a sealing fit with the upper conductive rod (25) via the third sealing ring (17).

9. The high voltage transformer bushing structure without handholes according to claim 8, characterized in that: The second metal washer (2) is detachably provided with a fastener (3), and the second metal washer (2) forms a press-locking fit with the upper conductive rod (25) via the fastener (3).

10. The high voltage transformer bushing structure without handholes according to claim 9, characterized in that: The upper conductive rod (25) and the lower conductive rod (26) are coaxially socket-fitted, and the socket-fitted portion is locked by a second screw (28).

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