Copper-aluminum transition terminal

Abstract

The utility model discloses a copper-aluminum transition terminal which comprises a copper crimping sheet, one end of the copper crimping sheet is provided with a copper bush, the other end of the copper bush is provided with a cylindrical clamping groove, an aluminum connecting sleeve used for accommodating an aluminum wire is arranged in the clamping groove, the aluminum connecting sleeve is in a circular truncated cone shape, and the diameter of the large-diameter end of the aluminum connecting sleeve is equal to the diameter of the clamping groove. The end face of the large-diameter end completely abuts against the copper bush, the copper bush located at the clamping groove can deform and completely wrap the aluminum connecting sleeve, and the outer circumferential face of the aluminum connecting sleeve makes face contact with the inner wall face of the copper bush. The copper-aluminum transition terminal is mainly characterized in that during electromagnetic pulse welding, the outer circumferential surface of the aluminum connecting sleeve and the inner wall of the copper bush are in complete face-to-face contact, air between the aluminum connecting sleeve and the copper bush can be completely exhausted, it is ensured that no copper-aluminum electrochemical reaction exists between the aluminum connecting sleeve and the copper bush, electrochemical corrosion is eradicated, the copper-aluminum transition terminal is not prone to breakage in the using process, and the service life of the copper-aluminum transition terminal is prolonged. The service life of the copper-aluminum transition terminal is prolonged, and the operation safety and reliability of power equipment are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting terminals, and in particular to a copper-aluminum transition terminal. Background Art

[0002] The copper-aluminum transition terminal is a terminal product that connects the aluminum conductor to the copper terminal of the equipment on the power transmission and distribution line. At present, the copper-aluminum transition terminal includes a copper terminal and an aluminum terminal. The copper terminal and the aluminum terminal are welded together by friction welding and stamped and machined.

[0003] For example, the authorization announcement number CN202294624U is a motor vehicle circuit system, including motor vehicle circuit equipment terminals on both sides; the motor vehicle circuit equipment terminals on each side are connected to the copper conductor at one end of the copper-aluminum transition terminal; the aluminum conductor at the other end of the copper-aluminum transition terminal is connected to the aluminum wire; the copper conductor and the aluminum conductor in the copper-aluminum transition terminal are integrated by a friction welding process. However, the above-mentioned connection by friction welding is easy to cause the welding process to be unstable during welding, resulting in a high scrap rate of the copper-aluminum transition terminal, and the copper-aluminum welding part is easy to break during installation and use, causing circuit failure; furthermore, friction welding takes a long time, and there are many burrs after welding, and the machining process requires a complex processing process and low efficiency. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a copper-aluminum transition terminal.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A copper-aluminum transition terminal comprises a copper crimping piece, one end of which is provided with a copper bushing, the other end of which is provided with a cylindrical slot, the slot containing an aluminum connecting sleeve for accommodating an aluminum wire, the aluminum connecting sleeve being truncated cone-shaped, the diameter of the large diameter end of which is equal to the diameter of the slot, and the end face of the large diameter end is completely in contact with the copper bushing, the copper bushing located at the slot can be deformed and completely wrapped around the aluminum connecting sleeve, and the outer circumferential surface of the aluminum connecting sleeve is in surface contact with the inner wall of the copper bushing.

[0007] Preferably, the copper crimping sheet is rectangular in shape and is provided with a mounting hole, and the mounting hole is circular.

[0008] Preferably, the copper bushing and the aluminum connecting sleeve are connected by electromagnetic pulse welding.

[0009] Preferably, the copper crimping sheet and the copper bushing are integrally formed.

[0010] Preferably, the copper crimping sheet and the copper bushing are made of T2 grade copper material.

[0011] Preferably, the aluminum connecting sleeve is made of 99.5% aluminum.

[0012] Preferably, a protrusion formed integrally therewith is provided on the outer circumferential surface of the copper bushing.

[0013] The beneficial effects of the utility model are mainly reflected in: the design is exquisite. During electromagnetic pulse welding, the outer circumference of the aluminum connecting sleeve is in full surface contact with the inner wall of the copper bushing, and the air between the two can be completely discharged, ensuring that there is no electrochemical reaction between the aluminum connecting sleeve and the copper bushing, eliminating electrochemical corrosion, making the copper-aluminum transition terminal not easy to break during use, increasing the service life of the copper-aluminum transition terminal and the safety and reliability of the operation of the power equipment. At the same time, since the aluminum connecting sleeve and the copper bushing are in full surface contact, the welding surface is significantly increased, and the stress phenomenon after welding is significantly reduced, so the mechanical strength is greatly improved, completely solving the defect of the copper-aluminum welding point of the existing copper-aluminum transition terminal, and ensuring the safety and reliability of the operation of the power equipment. In addition, the above does not require friction welding, and the production efficiency is high. The aluminum connecting sleeve and the copper bushing are in full contact, and its surface is completely covered by the copper bushing. During the installation and use process, direct contact with the aluminum wire is completely avoided, the connection is good, and the performance is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0015] Figure 1 : The structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0017] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0019] like Figure 1 As shown, the utility model discloses a copper-aluminum transition terminal, including a copper crimping piece 1, one end of the copper crimping piece 1 is provided with a copper bushing 2, the copper bushing 2 and the copper crimping piece 1 are made of T2 grade copper material, of course, other materials can also be used, all of which belong to the protection scope of the utility model. In a preferred embodiment, the copper crimping piece 1 and the copper bushing 2 are integrally formed, which can avoid the copper-aluminum transition terminal from being broken or damaged during later use, thereby extending the service life.

[0020] In this preferred embodiment, the outer circumferential surface of the copper bushing 2 is provided with a protrusion 21 integrally formed therewith, and the arrangement of the protrusion 21 can facilitate the installation and positioning of the copper-aluminum transition terminal, greatly improve the positioning efficiency, and have a wide applicability. The copper crimping piece 1 is rectangular and has a mounting hole 11 thereon, and the mounting hole 11 is circular.

[0021] The other end of the copper bushing 2 is provided with a cylindrical slot 3, and the slot 3 contains an aluminum connection sleeve 4 for accommodating the aluminum wire 5, and the aluminum connection sleeve 4 is made of 99.5% aluminum. In the above, the aluminum connection sleeve 4 is truncated cone-shaped, and the diameter of its large diameter end 41 is equal to the diameter of the slot 3, and the end face of the large diameter end 41 is completely in contact with the copper bushing 2. The copper bushing 2 located at the slot 3 can be deformed during electromagnetic pulse welding and completely wrapped on the aluminum connection sleeve 4, and the outer circumferential surface of the aluminum connection sleeve 4 is in surface contact with the inner wall of the copper bushing 2.

[0022] The above design is ingenious. During electromagnetic pulse welding, the outer circumferential surface of the aluminum connection sleeve 4 is in full surface contact with the inner wall of the copper bushing 2, and the air between the two can be completely discharged, ensuring that there is no electrochemical reaction between the aluminum connection sleeve 4 and the copper bushing 2, eliminating electrochemical corrosion, making the copper-aluminum transition terminal not easy to break during use, increasing the service life of the copper-aluminum transition terminal and the safety and reliability of the operation of the power equipment. At the same time, since the aluminum connection sleeve 4 and the copper bushing 2 are in full surface contact, the welding surface is significantly increased, and the stress phenomenon after welding is significantly reduced, so the mechanical strength is greatly improved, completely solving the defect of the copper-aluminum welding of the existing copper-aluminum transition terminal. The defect of the fracture phenomenon at the copper-aluminum welding point ensures the safety and reliability of the operation of the power equipment. In addition, the above does not require friction welding, and the production efficiency is high. The aluminum connection sleeve 4 is in full contact with the copper bushing 2, and its surface is completely covered by the copper bushing 2. During the installation and use process, direct contact with the aluminum wire is completely avoided, and the connection is good and the performance is stable.

[0023] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0024] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A copper-aluminum transition terminal, comprising a copper crimping piece (1), characterized in that: A copper bushing (2) is provided at one end of the copper crimping piece (1), and a cylindrical slot (3) is provided at the other end of the copper bushing (2). An aluminum connecting sleeve (4) for accommodating an aluminum wire (5) is built into the slot (3). The aluminum connecting sleeve (4) is truncated cone-shaped, and the diameter of its large diameter end (41) is equal to the diameter of the slot (3). The end surface of the large diameter end (41) is completely in contact with the copper bushing (2). The copper bushing (2) located at the slot (3) can be deformed to completely wrap around the aluminum connecting sleeve (4), and the outer circumferential surface of the aluminum connecting sleeve (4) is in surface contact with the inner wall of the copper bushing (2).

2. The copper-aluminum transition terminal according to claim 1, characterized in that: The copper crimping sheet (1) is rectangular in shape and is provided with a mounting hole (11), wherein the mounting hole (11) is circular in shape.

3. The copper-aluminum transition terminal according to claim 1, characterized in that: The copper bushing (2) and the aluminum connecting sleeve (4) are connected by electromagnetic pulse welding.

4. The copper-aluminum transition terminal according to claim 1, characterized in that: The copper crimping sheet (1) and the copper bushing (2) are integrally formed.

5. The copper-aluminum transition terminal according to claim 1, characterized in that: The copper crimping sheet (1) and the copper bushing (2) are made of T2 grade copper material.

6. The copper-aluminum transition terminal according to claim 1, characterized in that: The aluminum connecting sleeve (4) is made of 99.5% aluminum.

7. The copper-aluminum transition terminal according to claim 1, characterized in that: The outer circumferential surface of the copper bushing (2) is provided with a protrusion (21) formed integrally therewith.

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