Assembly structure of transformer
By employing a spliced side pressure plate structure and a U-shaped steel plate design in the oil-immersed transformer, the problems of coil deformation and easy bolt damage were solved, resulting in a more stable connection and a lighter transformer structure.
Patent Information
- Application Number
- CN202520149067.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-01-22
AI Technical Summary
Oil-immersed transformer coils are not stiff enough during sudden short circuits and are prone to deformation. Furthermore, existing bolted connections are easily damaged, affecting the structural load-bearing capacity.
The side pressure plate structure is spliced and connected, and the side pressure plate is fixed by upper and lower clamps and tie rods to avoid bolt connection. Combined with U-shaped steel plate structure, it can improve strength and reduce weight.
It improves the connection stability of the side pressure plates, prevents bolts from loosening, enhances the structural load-bearing capacity, and reduces production costs and weight.
Smart Images
Figure CN223871322U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of transformer accessories, and in particular to an assembly structure for a transformer. Background Technology
[0002] The ability of oil-immersed transformer coils to withstand sudden short circuits has always been a key and challenging aspect of transformer design and manufacturing. Unlike resin-cast dry-type transformer coils, oil-immersed transformer coils rely solely on adhesive paper and fasteners for bonding between layers during winding. This results in insufficient overall coil stiffness and bonding strength, making the coils susceptible to deformation or even damage from the immense short-circuit force during a sudden short circuit.
[0003] The phase gaps in oil transformer coils are relatively small, and the core columns restrict their movement, making them less prone to deformation during short circuits. However, the outer coils of phases A and C are subjected to outward electromagnetic forces during short circuits, making them susceptible to bulging deformation. Currently, side pressure plates are mostly used on the outer sides of phases A and C to prevent coil deformation. The connection between the side pressure plates and the clamps is generally via bolts. This exposes the bolts to shear forces, making them prone to shear failure and significantly weakening the structure's load-bearing capacity. Utility Model Content
[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an assembly structure for a transformer to solve one or more problems in the prior art.
[0005] To achieve the above objectives, the technical solution of this utility model is as follows:
[0006] An assembly structure for a transformer includes an upper clamp, a lower clamp, and a side pressure plate disposed between the upper clamp and the lower clamp. An upper stop block is provided on the end of the side pressure plate facing the upper clamp, and a lower stop block is provided on the end of the side pressure plate facing the lower clamp. The upper clamp has a first mounting groove adapted to the upper stop block, and the lower clamp has a second mounting groove adapted to the lower stop block. The upper stop block is inserted into the first mounting groove, and the lower stop block is inserted into the second mounting groove. The upper clamp and the lower clamp are connected together by a pull screw.
[0007] With the above solution, the side pressure plate is connected between the upper clamp and the lower clamp by splicing. Then, the upper clamp and the lower clamp are used to ensure that the side pressure plate is continuously pressured by the upper clamp and the lower clamp, so that the side pressure plate can be stably connected to the clamp without bolts.
[0008] Furthermore, the upper clamping member includes two symmetrically arranged first fittings and a side screw for connecting the two first fittings, and the lower clamping member includes two symmetrically arranged second fittings and a side screw for connecting the two second fittings. The first fittings and the second fittings have the same structure, the upper end block and the lower end block have the same cross-section in the horizontal direction, and the first mounting groove and the second mounting groove are mounting grooves with the same structure.
[0009] With the above solution, the upper and lower clamps have the same structure and can be manufactured using the same production equipment, which can effectively reduce production costs and make assembly simpler.
[0010] Furthermore, both the first and second accessories are bent parts, each including a first horizontal section, a second horizontal section, and a vertical section. The vertical section connects the first and second horizontal sections, the first horizontal section is parallel to the second horizontal section, the mounting groove is formed on the first horizontal section, the vertical section is used to connect with the side threaded rod, and the second horizontal section is used to connect with the pull threaded rod.
[0011] The above solution results in a Z-shaped bending component with strong load-bearing capacity, which can reduce the thickness of the steel plate and lower production costs.
[0012] Furthermore, the two ends of the first horizontal segment protrude from the corresponding two ends of the second horizontal segment in the length direction, and the mounting groove is formed on the end of the first horizontal segment.
[0013] Furthermore, multiple notches are provided on the second horizontal segment, and the multiple notches are arranged at intervals along the length direction of the second horizontal segment.
[0014] The above solution provides space for the low-voltage coil copper busbar, making the overall structure more compact and reducing the overall transformer body size.
[0015] Furthermore, the side pressure plate is a bent plate with a U-shaped cross-section, and the upper and lower stop blocks are both located on the folded edge of the side pressure plate.
[0016] The above scheme can improve the strength of the steel plate under lateral pressure, thereby allowing the use of thinner steel plates and effectively reducing the weight of the vessel.
[0017] Furthermore, the height of the upper stop block is greater than the depth of the mounting groove, and the height of the lower stop block is less than or equal to the depth of the mounting groove.
[0018] With the above solution, after the upper stop block is inserted into the mounting slot of the upper clamp, its top will protrude from the upper clamp. This makes it less likely for the upper stop block to detach from the corresponding mounting slot when the upper clamp vibrates during transformer operation, thus ensuring a stable connection between the side pressure plate and the clamp.
[0019] Compared with existing technologies, the beneficial technical effects of this utility model are as follows: the side pressure plates are spliced and connected without bolts, preventing bolts from loosening and falling off due to vibration during transformer operation, thus affecting transformer operation; the side pressure plates adopt a "U"-shaped structure, which improves the strength of the steel plate under lateral pressure, allowing the use of thinner steel plates and effectively reducing the weight of the transformer body. The assembly structure is simple, easy to operate, and easy to assemble and disassemble. Attached Figure Description
[0020] Figure 1 This diagram illustrates the application of an assembly structure for a transformer provided in an embodiment of the present invention.
[0021] Figure 2 A schematic diagram of the structure of the side pressure plate provided in an embodiment of the present invention is shown.
[0022] Figure 3 A schematic diagram of the upper clamp provided in an embodiment of the present invention is shown.
[0023] Figure 4 for Figure 1 A magnified view of A in the middle.
[0024] Reference numerals: 1. Upper clamp; 11. First mounting groove; 12. First horizontal section; 13. Second horizontal section; 14. Vertical section; 15. Notch; 2. Lower clamp; 3. Side pressure plate; 31. Upper stop block; 32. Lower stop block; 4. Pull screw; 5. Side screw. Detailed Implementation
[0025] An assembly structure for a transformer, see [link / reference] Figure 1 This system, applied to the body of a three-phase distribution transformer, includes an upper clamp 1, a lower clamp 2, and a side pressure plate 3 disposed between the upper clamp 1 and the lower clamp 2. The upper clamp 1 clamps the upper yoke of the core, and the lower clamp 2 clamps the lower yoke of the core. There are two side pressure plates 3, located on opposite sides of the transformer body along its length, and each side pressure plate 3 applies pressure to the corresponding coil towards the center of the transformer body.
[0026] See Figure 1 , Figure 2 The side pressure plate 3 is a U-shaped bent plate, comprising a main body and two folded edges. An upper stop block 31 and a lower stop block 32 are respectively provided at both ends of the folded edges. Both the upper and lower stop blocks 31 are integrally formed with the folded edges, and the upper stop blocks 31 of both folded edges are located at the same end of the side pressure plate 3. The upper and lower stop blocks 31 and 32 have the same cross-section in the horizontal direction, but the height of the upper stop block 31 is greater than the height of the lower stop block 32. Due to the structural difference between the upper and lower stop blocks 31 and 32, when using the side pressure plate 3, it is necessary to ensure that the upper stop block 31 faces upwards.
[0027] See Figure 1 The upper clamp 1 includes two symmetrically arranged first parts and a side screw 5 for connecting the two first parts, and the lower clamp 2 includes two symmetrically arranged second parts and a side screw 5 for connecting the two second parts. The first and second parts have the same structure and are both bent parts.
[0028] See Figure 3 The bent component includes a first horizontal segment 12, a second horizontal segment 13 and a vertical segment 14. The vertical segment 14 is connected between the first horizontal segment 12 and the second horizontal segment 13. The first horizontal segment 12 is parallel to the second horizontal segment 13.
[0029] The two ends of the first horizontal segment 12 protrude beyond the corresponding ends of the second horizontal segment 13 in the length direction, and mounting grooves are formed on the protruding ends of the first horizontal segment 12. The height of the upper stop block 31 is greater than the depth of the mounting groove, and the height of the lower stop block 32 is less than or equal to the depth of the mounting groove. In this embodiment, the height of the lower stop block 32 is equal to the depth of the mounting groove. When the bent part is used in the upper clamp 1, the mounting groove is defined as a first mounting groove 11 for the upper stop block 31 to be inserted, and as... Figure 4 As shown, the top of the upper stop 31 protrudes from the first mounting groove 11. When the bent part is used in the lower clamp 2, the corresponding mounting groove is defined as a second mounting groove for the lower stop 32 to be inserted.
[0030] The second horizontal section 13 has multiple notches 15 and multiple first positioning holes for the pull screw 4 to pass through. The notches 15 and the first positioning holes are arranged alternately along the length of the second horizontal section 13.
[0031] The vertical section 14 has a second positioning hole for the side screw 5 to pass through, and there are two second positioning holes, which are located at both ends of the vertical section 14 along its length.
[0032] The assembly process is as follows: Use the side screw 5 to connect two bent parts as the lower clamp 2. Place the iron core with the coil on the lower clamp 2. Place the lower end blocks 32 of the side pressure plates 3 on both sides into the second mounting slots of the lower clamp 2. Use straps to tie the two side pressure plates 3 so that the side pressure plates 3 are perpendicular to the lower clamp 2. Install the upper clamp 1 to ensure that the upper end blocks 31 of the side pressure plates 3 are placed in the mounting slots of the upper clamp 1. After the upper clamp 1 is installed, tighten the pull screw 4 between the upper clamp 1 and the lower clamp 2. Insert cardboard between the side pressure plates 3 and the coil so that the coil directly abuts against the side pressure plates 3.
[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0034] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. An assembly structure for a transformer, characterized in that: The device includes an upper clamp (1), a lower clamp (2), and a side pressure plate (3) disposed between the upper clamp (1) and the lower clamp (2). The side pressure plate (3) has an upper end stop (31) on the end facing the upper clamp (1) and a lower end stop (32) on the end facing the lower clamp (2). The upper clamp (1) has a first mounting groove (11) adapted to the upper end stop (31), and the lower clamp (2) has a second mounting groove adapted to the lower end stop (32). The upper end stop (31) is inserted into the first mounting groove (11), and the lower end stop (32) is inserted into the second mounting groove. The upper clamp (1) and the lower clamp (2) are connected together by a pull screw (4).
2. The assembly structure of a transformer as described in claim 1, characterized in that: The upper clamp (1) includes two symmetrically arranged first accessories and a side screw (5) for connecting the two first accessories. The lower clamp (2) includes two symmetrically arranged second accessories and a side screw (5) for connecting the two second accessories. The first accessories and the second accessories have the same structure. The upper end block (31) and the lower end block (32) have the same cross-section in the horizontal direction. The first mounting groove (11) and the second mounting groove are mounting grooves with the same structure.
3. The assembly structure of a transformer as described in claim 2, characterized in that: Both the first and second accessories are bent parts. The bent parts include a first horizontal section (12), a second horizontal section (13), and a vertical section (14). The vertical section (14) is connected between the first horizontal section (12) and the second horizontal section (13). The first horizontal section (12) is parallel to the second horizontal section (13). The mounting groove is opened on the first horizontal section (12). The vertical section (14) is used to connect with the side screw (5). The second horizontal section (13) is used to connect with the pull screw (4).
4. The assembly structure of a transformer as described in claim 3, characterized in that: The two ends of the first horizontal segment (12) protrude from the two ends of the second horizontal segment (13) in the length direction, and the mounting groove is opened on the end of the first horizontal segment (12).
5. The assembly structure of a transformer as described in claim 3, characterized in that: The second horizontal segment (13) has multiple notches (15) arranged at intervals along the length of the second horizontal segment (13).
6. The assembly structure of a transformer as described in claim 1, characterized in that: The side pressure plate (3) is a bent plate with a U-shaped cross-section, and the upper end block (31) and the lower end block (32) are both located on the folded edge of the side pressure plate (3).
7. The assembly structure of a transformer as described in claim 2, characterized in that: The height of the upper stop (31) is greater than the depth of the mounting groove, and the height of the lower stop (32) is less than or equal to the depth of the mounting groove.