Matched oppositely-embedded copper bar piece for dry-type transformer
By designing the copper busbar body into an outlet section, a bending section, and a welding section, and combining rectangular and trapezoidal segment structures, the problem of wasted copper busbar welding parts was solved, achieving efficient utilization of the copper busbar and improved mechanical stability.
Patent Information
- Application Number
- CN202520331762.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-27
AI Technical Summary
The welding of copper busbars in existing dry-type transformers results in significant waste during winding, leading to high production costs and insufficient mechanical stability.
The copper busbar body is designed to include a lead-out section, a bending section, and a welding section. The welding section consists of rectangular and trapezoidal segments, with the trapezoidal segments gradually increasing in cross-sectional area. The inner and outer copper busbars are connected by fasteners to ensure current carrying capacity and mechanical stability.
This reduces copper busbar waste, lowers production costs, improves copper busbar utilization and mechanical stability, and ensures effective current collection.
Smart Images
Figure CN223927186U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transformer technology, specifically to a mating interlocking copper busbar for dry-type transformers. Background Technology
[0002] Transformer copper busbars are one of the most important conductive components inside a transformer, primarily used to connect various electrical parts such as windings, bushings, and grounding terminals. Due to their excellent conductivity, high mechanical strength, and good corrosion resistance, copper busbars are widely used in power equipment.
[0003] Currently, when winding copper foil in dry-type transformers, the copper foil and copper busbars need to be connected by welding at the beginning and end to draw current. The current carrying capacity of the copper busbar must meet the cross-sectional area requirement of the total current, meaning the cross-sectional area of the copper busbar should not be less than the current-carrying cross-sectional area of the copper foil. However, in existing technology, the copper busbar is usually rectangular, and during copper foil winding, a single copper busbar is typically welded directly onto the copper foil. This results in the cross-sectional area of the copper busbar at the welded part being much larger than the current-carrying cross-sectional area of the copper foil, leading to significant copper busbar waste and increased production costs. Therefore, this invention proposes a mating, interlocking copper busbar component for dry-type transformers to reduce copper busbar waste during the production of copper foil windings. Utility Model Content
[0004] The main purpose of this utility model is to provide a matching interlocking copper busbar for dry-type transformers to reduce copper busbar waste during the production of copper foil windings.
[0005] To achieve the above objectives, the present invention proposes a mating interlocking copper busbar component for a dry-type transformer, comprising a copper busbar body and fasteners; the copper busbar body includes a lead-out portion, a bending portion, and a welding portion connected in sequence; the lead-out portion and the welding portion are parallel to each other; the lead-out portion is used to connect other electrical equipment; the welding portion is used to weld the copper foil of the winding so that the copper busbar body is connected to the winding; the welding portion includes a rectangular segment and a trapezoidal segment; the trapezoidal segment is a right-angled trapezoid; one end of the rectangular segment is connected to the bending portion, the other end of the rectangular segment is connected to a right-angled side of the trapezoidal segment, and the other right-angled side of the trapezoidal segment is flush with the rectangular segment; the side length of the trapezoidal segment connecting to the rectangular segment is greater than the side length of the trapezoidal segment away from the rectangular segment, and the sum of the side lengths of the trapezoidal segment connecting to the rectangular segment and the side length of the trapezoidal segment away from the rectangular segment is equal to the length of the rectangular segment; the fasteners are used to connect two copper busbar bodies located on the outer and inner sides of the winding.
[0006] Preferably, the end of the lead-out portion away from the bending portion is provided with a plurality of first connecting holes, which are used to connect other electrical equipment; the first connecting holes are arranged in a rectangular pattern.
[0007] Preferably, a second connecting hole is provided at one end of the lead-out portion near the bending portion; the second connecting hole of the copper busbar body located on the inner side of the winding is directly opposite to the second connecting hole of the copper busbar body located on the outer side of the winding; the fastener passes through the two directly opposite second connecting holes in sequence to connect the two copper busbar bodies located on the inner and outer sides of the winding.
[0008] Preferably, the fastener includes an abutment groove, a through rod, an insulating post, and a nut; the abutment groove is a U-shaped groove; the copper busbar body located inside the winding is located within the abutment groove, and all three inner walls of the abutment groove abut against the copper busbar body; the through rod is vertically disposed on the inner bottom wall of the abutment groove, and the through rod passes through two second connecting holes in sequence; the end of the through rod away from the abutment groove is provided with a thread, the nut is connected to the thread, and the nut abuts against the copper busbar body located outside the winding; the insulating post is sleeved on the through rod, and both ends of the insulating post abut against two copper busbar bodies respectively.
[0009] Preferably, the nut includes a nut body and a screwing portion disposed on the upper side of the nut body; the nut body is threaded onto the through rod; the number of screwing portions is two, and the two screwing portions are symmetrically disposed at both ends of the nut body.
[0010] Preferably, the welded portion has a through-hole; the weld hole is trapezoidal, and the shape of the weld hole is consistent with that of the trapezoidal segment.
[0011] Preferably, the sidewall of the copper busbar body located inside the winding and welded to the copper foil is a plane, and the sidewall and the adjacent two sidewalls are provided with chamfers; the sidewall of the copper busbar body away from the copper foil is a plane.
[0012] Preferably, the sidewall of the copper busbar body located outside the winding that is welded to the copper foil is an arc surface, and the sidewall of the copper busbar body away from the copper foil is also an arc surface.
[0013] Preferably, the angle between the bent portion and the lead-out portion is an obtuse angle; the angle between the bent portion and the welded portion is an obtuse angle.
[0014] Preferably, the walls of the welding holes are chamfered.
[0015] In the technical solution of this utility model, the welded part of the copper busbar body includes a rectangular segment and a trapezoidal segment. The cross-sectional area of the trapezoidal segment gradually increases towards the rectangular segment, which can meet the current convergence at different positions of the copper busbar, ensuring the current carrying capacity of the copper busbar and preventing the function of the copper busbar from being affected. At the same time, compared with traditional copper busbars, it can also save material and improve the actual utilization rate of the copper busbar. The sum of the side length of the trapezoidal segment connecting the rectangular segment and the side of the trapezoidal segment away from the rectangular segment is equal to the length of the rectangular segment. This allows two identical copper busbar bodies to be obtained by simple cutting of one rectangular copper busbar, simplifying processing and reducing production costs. The two copper busbar bodies located on the outer and inner sides of the winding are connected by the fasteners to fix the relative positions of the inner and outer copper busbars, so that the copper busbar remains relatively stable during operation and enhances mechanical stability. In summary, the mating embedded copper busbar component for dry-type transformers can improve the utilization rate of copper busbars, save material, reduce production costs, and improve mechanical stability during operation. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0017] Figure 1 This is a front view structural diagram of the mating embedded copper busbar component for dry-type transformers according to this utility model.
[0018] Figure 2 This is a side view of the mating embedded copper busbar component for a dry-type transformer according to the present invention.
[0019] Figure 3 This is a schematic diagram of the working process of the mating embedded copper busbar component for dry-type transformers according to this utility model.
[0020] Figure 4 This is a structural schematic diagram of the fastener for mating and inserting copper busbars used in dry-type transformers according to this utility model.
[0021] Figure 5 This is a cross-sectional view at point AA of the first embodiment of the mating embedded copper busbar for dry-type transformers according to the present invention.
[0022] Figure 6 This is a cross-sectional view at point AA of the second embodiment of the mating embedded copper busbar for dry-type transformers according to the present invention.
[0023] Figure 7 This is a schematic diagram showing the cutting process of the mating embedded copper busbar component for dry-type transformers according to this utility model.
[0024] Explanation of icon numbers:
[0025] 1-Copper busbar body; 11-Lead-out part; 12-Bending part; 13-Welding part; 14-First connecting hole; 15-Second connecting hole; 16-Welding hole; 2-Fastener; 21-Abutting groove; 22-Through rod; 221-Thread; 23-Nut; 231-Nut body; 232-Tightening part; 24-Insulating post; 3-Winding.
[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0027] 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.
[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0029] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0031] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0032] This utility model proposes a mating interlocking copper busbar for dry-type transformers.
[0033] Please refer to Figures 1 to 7 The mating interlocking copper busbar for a dry-type transformer includes a copper busbar body 1 and a fastener 2. The copper busbar body 1 includes a lead-out portion 11, a bent portion 12, and a welding portion 13 connected in sequence. The lead-out portion 11 and the welding portion 13 are parallel to each other. The lead-out portion 11 is used to connect other electrical equipment. The welding portion 13 is used to weld the copper foil of the winding 3 so that the copper busbar body 1 is connected to the winding 3. The welding portion 13 includes a rectangular segment and a trapezoidal segment. The trapezoidal segment is a right-angled trapezoid. One end of the rectangular segment is connected to... Connecting to the bending portion 12, the other end of the rectangular segment is connected to one right-angled side of the trapezoidal segment, and the other right-angled side of the trapezoidal segment is flush with the rectangular segment; the side length of the trapezoidal segment connected to the rectangular segment is greater than the side length of the trapezoidal segment away from the rectangular segment, and the sum of the side lengths of the trapezoidal segment connected to the rectangular segment and the side length of the trapezoidal segment away from the rectangular segment is equal to the length of the rectangular segment; the fastener 2 is used to connect the two copper busbar bodies 1 located on the outer and inner sides of the winding 3.
[0034] In the technical solution of this utility model, the welding part 13 of the copper busbar body 1 includes a rectangular segment and a trapezoidal segment. The cross-sectional area of the trapezoidal segment gradually increases towards the rectangular segment, which can meet the current convergence at different positions of the copper busbar, ensuring the current carrying capacity of the copper busbar and ensuring that the function of the copper busbar is not affected. At the same time, compared with traditional copper busbars, it can also save material and improve the actual utilization rate of the copper busbar. The sum of the side length of the trapezoidal segment connecting the rectangular segment and the side of the trapezoidal segment away from the rectangular segment is equal to the length of the rectangular segment. This allows two identical copper busbar bodies 1 to be obtained by simple cutting of one rectangular copper busbar, simplifying processing and reducing production costs. The two copper busbar bodies 1 located on the outer and inner sides of the winding 3 are connected by the fastener 2 to fix the relative positions of the inner and outer copper busbars, so that the copper busbar remains relatively stable during operation and enhances mechanical stability. In summary, the mating embedded copper busbar component for dry-type transformers can improve the utilization rate of copper busbars, save material, reduce production costs, and improve mechanical stability during operation.
[0035] Specifically, the widths of the lead-out portion 11, the bent portion 12, and the rectangular segment are equal, which is the normal width of the copper busbar. Please refer to... Figure 7 When the copper busbar body 1 is cut, two copper busbar bodies 1 can be joined together to form a rectangular copper plate. Compared with the traditional copper busbar cutting method, it can save rectangular copper plate material equivalent to the length of one trapezoidal segment.
[0036] Furthermore, the surface of the copper busbar body 1 needs to be tin-plated by 15-20 micrometers using an electroplating process, which can ensure that it does not turn black at a high temperature of 180 degrees Celsius; the lead-out part 11 is embossed to improve contact reliability.
[0037] Preferably, the end of the lead-out portion 11 away from the bending portion 12 is provided with a plurality of first connecting holes 14, the first connecting holes 14 being used to connect other electrical equipment; the first connecting holes 14 are arranged in a rectangular pattern.
[0038] Specifically, the first connecting hole 14 is a circular hole with a diameter of 18 mm. In this embodiment, there are four first connecting holes 14. Furthermore, the first connecting hole 14 can also be an oblong hole.
[0039] Preferably, a second connecting hole 15 is provided at one end of the lead-out portion 11 near the bending portion 12; the second connecting hole 15 of the copper busbar body 1 located inside the winding 3 is directly opposite to the second connecting hole 15 of the copper busbar body 1 located outside the winding 3; the fastener 2 passes through the two directly opposite second connecting holes 15 in sequence to connect the two copper busbar bodies 1 located inside and outside the winding 3. Specifically, the second connecting hole 15 is located on the centerline of the copper busbar body 1; the second connecting hole 15 is a round hole.
[0040] Preferably, the fastener 2 includes an abutment groove 21, a through rod 22, an insulating post 24, and a nut 23; the abutment groove 21 is a U-shaped groove; the copper busbar body 1 located inside the winding 3 is located in the abutment groove 21, and all three inner walls of the abutment groove 21 abut against the copper busbar body 1; the through rod 22 is vertically disposed on the inner bottom wall of the abutment groove 21, and the through rod 22 passes through two second connecting holes 15 in sequence; the end of the through rod 22 away from the abutment groove 21 is provided with a thread 221, the nut 23 is connected to the thread 221, and the nut 23 abuts against the copper busbar body 1 located outside the winding 3; the insulating post 24 is sleeved on the through rod 22, and both ends of the insulating post 24 abut against two copper busbar bodies 1 respectively.
[0041] All three inner walls of the abutment groove 21 abut against the copper busbar body 1, meaning the copper busbar body 1 can be locked within the abutment groove 21. The through rod 22 passes through the inner and outer copper busbars sequentially and connects to the nut 23, thus connecting the inner and outer copper busbars together via the fastener 2. Compared to the prior art where bolt connections pass through the inner and outer copper busbars, requiring a wrench to restrict the rotation of the bolt nut before tightening the nut, this is clearly more convenient and efficient. Furthermore, the insulating post 24 abuts against the inner and outer copper busbars on both sides, fixing their relative positions and resisting vibrations, thus improving the mechanical stability of the structure.
[0042] The length of the through rod 22 is determined according to the distance between the two copper busbars, and the fastener 2 can also be used to connect two copper busbars that are close to each other.
[0043] Preferably, the nut 23 includes a nut body 231 and a screwing part 232 disposed on the upper side of the nut body 231; the nut body 231 is threaded onto the through rod 22; the number of screwing parts 232 is two, and the two screwing parts 232 are symmetrically disposed at both ends of the nut body 231.
[0044] Specifically, the nut body 231 is a hexagonal nut. The tightening part 232 is provided on the upper side of the nut body 231, so that the nut 23 can be tightened by using a wrench or by manually tightening the tightening part 232, which makes installation more convenient and efficient.
[0045] Preferably, the welding part 13 is provided with a welding hole 16 through it; the welding hole 16 is trapezoidal, and the shape of the welding hole 16 is consistent with that of the trapezoidal segment.
[0046] The welding hole 16 is used to increase the welding area between the copper busbar body 1 and the copper foil, so as to make the connection between the copper busbar and the copper foil more stable. In specific operation, after the edge of the copper busbar is welded to the copper foil, it can also be welded to the middle of the copper foil through the welding hole 16. Specifically, the welding hole 16 is a trapezoidal hole, with the wider section of the trapezoidal hole close to the rectangular section and the narrower section of the trapezoidal hole far away from the rectangular section, which is more conducive to ensuring that the cross-sectional area of the copper busbar meets the current carrying requirements.
[0047] Preferably, the sidewall of the copper busbar body 1 located inside the winding 3, where it is welded to the copper foil, is a plane, and the sidewall and the adjacent two sidewalls are provided with chamfers; the sidewall of the copper busbar body 1 away from the copper foil is a plane. This arrangement makes it easier for one side of the inner busbar to make close contact with the copper foil during winding, and the other side is more conducive to contact with the foil winding machine, while the chamfer helps to reduce stress concentration and improve electrical safety.
[0048] Preferably, the sidewall of the copper busbar body 1 located outside the winding 3 that is welded to the copper foil is an arc surface, and the sidewall of the copper busbar body 1 that is away from the copper foil is also an arc surface.
[0049] This arrangement facilitates close contact between the outer busbar and the copper foil. Specifically, the sidewall of the copper busbar body 1 located outside the winding 3, where it is welded to the copper foil, is a concave surface, while the sidewall of the copper busbar body 1 away from the copper foil is a convex surface.
[0050] Preferably, the angle between the bent portion 12 and the lead-out portion 11 is an obtuse angle; the angle between the bent portion 12 and the welded portion 13 is also an obtuse angle. Obtuse angles facilitate connection between the inner and outer leads and other electrical equipment. Specifically, the obtuse angle is 115°.
[0051] Preferably, a chamfer is provided between the walls of the welding hole 16. The chamfer facilitates welding operations, improves welding results, and reduces stress concentration. Specifically, the chamfer is a rounded chamfer with a diameter of 5 mm.
[0052] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.
Claims
1. A mating pair of embedded copper bar pieces for a dry-type transformer, characterized by, The application relates to a copper bar body (1) and a fastener (2); the copper bar body (1) comprises a leading-out part (11), a bending part (12) and a welding part (13) which are sequentially connected; the leading-out part (11) and the welding part (13) are parallel to each other; the leading-out part (11) is used for connecting other electrical equipment; the welding part (13) is used for welding copper foils of a winding (3) so that the copper bar body (1) is connected to the winding (3); the welding part (13) comprises a rectangular section and a trapezoidal section; the trapezoidal section is a right-angled trapezoid; one end of the rectangular section is connected to the bending part (12), the other end of the rectangular section is connected to one right-angled side of the trapezoidal section, and the other right-angled side of the trapezoidal section is flush with the rectangular section; the length of one side of the trapezoidal section connected to the rectangular section is greater than the length of one side of the trapezoidal section away from the rectangular section, and the sum of the lengths of the two sides of the trapezoidal section is equal to the length of the rectangular section; the fastener (2) is used for connecting two copper bar bodies (1) located on the outer side and the inner side of the winding (3).
2. The mating pair of embedded copper bar members for a dry-type transformer of claim 1, wherein, A plurality of first connecting holes (14) are arranged at the end of the leading-out part (11) away from the bending part (12); the first connecting holes (14) are used for connecting other electrical equipment; and the first connecting holes (14) are arranged in a rectangular distribution.
3. The mating pair of embedded copper bar members for a dry-type transformer of claim 1, wherein, A second connecting hole (15) is arranged at the end of the leading-out part (11) close to the bending part (12); the second connecting hole (15) of the copper bar body (1) located on the inner side of the winding (3) is opposite to the second connecting hole (15) of the copper bar body (1) located on the outer side of the winding (3); and the fastener (2) sequentially penetrates through the two opposite second connecting holes (15) to connect the two copper bar bodies (1) located on the inner side and the outer side of the winding (3).
4. The mating pair of embedded copper bar members for a dry-type transformer of claim 3, wherein, The fastener (2) comprises an abutting groove (21), a penetrating rod (22), an insulating column (24) and a nut (23); the abutting groove (21) is a U-shaped groove; the copper bar body (1) located on the inner side of the winding (3) is located in the abutting groove (21), and the three inner walls of the abutting groove (21) abut against the copper bar body (1); the penetrating rod (22) is vertically arranged on the inner bottom wall of the abutting groove (21), and sequentially penetrates through the two second connecting holes (15); one end of the penetrating rod (22) away from the abutting groove (21) is provided with a screw thread (221), the nut (23) is connected to the screw thread (221), and the nut (23) abuts against the copper bar body (1) located on the outer side of the winding (3); and the insulating column (24) is sleeved on the penetrating rod (22), and the two ends of the insulating column (24) abut against the two copper bar bodies (1) respectively.
5. The mating pair of embedded copper bar members for a dry-type transformer of claim 4, wherein, The nut (23) comprises a nut body (231) and a screwing part (232) arranged on the upper side of the nut body (231); the nut body (231) is threadedly sleeved on the through rod (22); the screwing part (232) is in number of two, and the two screwing parts (232) are symmetrically arranged at the two ends of the nut body (231).
6. The mating pair of embedded copper bar members for a dry-type transformer of claim 1, wherein, The welding part (13) is provided with a welding hole (16) penetrating through; the welding hole (16) is in a trapezoidal shape, and the welding hole (16) is consistent with the shape of the trapezoidal section.
7. The mating pair of embedded copper bar members for a dry-type transformer of claim 1, wherein, The side wall of the copper bar body (1) which is welded with the copper foil and is located inside the winding (3) is a plane, and the side wall and the two adjacent side walls are provided with inclined chamfers; the side wall of the copper bar body (1) which is away from the copper foil is a plane.
8. The mating pair of embedded copper bar members for a dry-type transformer of claim 1, wherein, The side wall of the copper bar body (1) which is welded with the copper foil and is located outside the winding (3) is a circular arc surface, and the side wall of the copper bar body (1) which is away from the copper foil is a circular arc surface.
9. The mating pair of embedded copper bar members for a dry-type transformer of claim 1, wherein, The included angle between the bending part (12) and the leading-out part (11) is an obtuse angle; the included angle between the bending part (12) and the welding part (13) is an obtuse angle.
10. The mating pair of embedded copper bar members for a dry-type transformer of claim 6, wherein, The hole walls of the welding hole (16) are provided with chamfers.