CN216450820U - Copper-aluminum wiring terminal - Google Patents

Abstract

The utility model discloses a copper-aluminum wiring terminal which comprises a main body DT copper terminal and an aluminum plate, wherein the main body DT copper terminal comprises a round pipe end, a transition end and a flat end, the round pipe end, the transition end and the flat end are integrally formed through stamping, the aluminum plate is welded on the lower side of the flat end through brazing, and the aluminum plate and the flat end are provided with connecting holes which are same in size and coaxial. The utility model can improve the tensile and shear strength of the terminal, improve the problems of heating and breaking of the terminal, realize the lap joint of the copper-core stranded wire and the aluminum bar or the aluminum terminal, and simultaneously facilitate the installation and reduce the cost.

Description

Copper-aluminum wiring terminal

Technical Field

The utility model relates to the technical field of structural design of wire connecting devices, in particular to a novel copper-aluminum wiring terminal.

Background

The terminals of the power capacitor unit and the connection between the terminals and the aluminum busbar are connected by soft copper stranded wires. The soft copper stranded wire is directly lapped with the aluminum bar through a copper-aluminum connecting terminal or lapped with the aluminum bar through a copper terminal and a copper-aluminum transition piece.

1) In the first method, a conventional copper-aluminum wiring terminal (shown in figure 1) is fixed with an aluminum bar by using bolts, nuts, washers and the like;

2) in the second method, a copper-aluminum transition piece is added between the copper terminal and the aluminum bar through the copper wiring terminal, and then the copper-aluminum transition piece is fixed with the aluminum bar by using bolts, nuts, washers and the like (figure 2).

In the first method, the conventional copper-aluminum wiring terminal is made of two materials, namely copper and aluminum, at the flat plate end of the terminal, the welding surface is small, the welding strength is not high, the terminal bears low tensile force, and the copper-aluminum wiring terminal can crack when the tensile force is too large, so that the terminal generates heat. And the expansion coefficient of copper and aluminum is inconsistent, expansion with heat and contraction with cold, the wiring terminal is not uniformly expanded and extruded under the condition of environmental temperature fluctuation, the crack degree is further increased, and finally the fracture of the wiring terminal board is easily caused.

In the second method, if the contact surface is not treated, the conductive paste is not coated, the heating condition at the lap joint part is easily caused, and the copper-aluminum transition piece is used more, so that the installation link and the material cost are increased.

The existing copper-aluminum wiring terminal has the following three technical schemes:

1) the first technical scheme is as follows: copper aluminium binding post, including terminal main part, 15 one end of terminal main part is provided with well kenozooecium, and the other end is provided with crosses cab apron 13, and terminal main part 15 with cross to be connected through domatic 14 between the cab apron 13, terminal main part 15 with cross cab apron 13 and set up to the integral type structure, and terminal main part 15 with cross cab apron 13 and set up to aluminium matter structure, wiring board 11 sets up to copper structure, wiring board 11 is fixed through friction weld with crossing cab apron 13.

2) The second technical scheme is as follows: the copper-aluminum wiring terminal comprises an aluminum body 1 and a copper body 2. The aluminum body 1 is composed of an aluminum pipe 17, an aluminum connecting plate 12 and an aluminum fixing plate 16 which are integrally formed, and the copper body 2 is a flat plate and is provided on the upper surface of the aluminum fixing plate 16.

3) The third technical scheme is as follows: the copper-aluminum wiring terminal comprises an aluminum body 1 and a copper body 2. The aluminum body 1 is composed of an aluminum pipe 17, an aluminum connecting plate 12 and an aluminum fixing plate 16 which are integrally formed, and the copper body 2 is a flat plate and is provided on the lower surface of the aluminum fixing plate 16.

The above prior art solutions have the following drawbacks:

1. the first technical scheme is that aluminum is used as a main body, and a tubular end can only be connected with an aluminum core cable or a stranded wire, so that the limitation exists; and the welding surface of the transition plate 11 and the slope surface 13 is small, the welding strength is not enough, the copper-aluminum expansion coefficients are inconsistent, expansion with heat and contraction with cold are caused, the wiring terminal is not uniformly expanded and extruded under stress under the condition of environmental temperature fluctuation, the crack degree is further increased, and finally the fracture of the wiring terminal plate is easily caused.

2. In the second technical scheme, aluminum is used as a main body, and the tubular end can only be connected with an aluminum core cable or a stranded wire, so that the limitation exists; the copper body 2 is attached to the fixed surface of the aluminum fixing plate 13; the aluminum connecting plate 12 of the terminal is trapezoidal, which is not favorable for the lap joint of the terminal or the copper bar with larger distance from the hole to the edge.

3. In the third technical scheme, aluminum is used as a main body, and the tubular end can only be connected with an aluminum core cable or a stranded wire, so that the limitation exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a copper-aluminum wiring terminal, which aims to overcome the problems in the prior art, can improve the tensile and shear strength of the terminal, improve the problems of heating and breaking of the terminal, realize the lap joint of a copper core stranded wire and an aluminum bar or an aluminum terminal, and is convenient to install and low in cost.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a copper aluminium binding post, includes main part DT copper terminal and aluminum plate, main part DT copper terminal includes pipe end, transition end and flush end, pipe end, transition end and flush end pass through punching press integrated into one piece, aluminum plate welds the downside at the flush end through brazing, and aluminum plate and the flush end on be provided with the same and coaxial connecting hole of size.

Further, the lower surfaces of the round pipe end, the transition end and the flat end are located on the same plane.

Further, the transition end adopts a circular arc structure.

Further, the free end of the round tube end is provided with a flare.

Further, the thickness of the aluminum plate is 1-1.5 mm.

Further, when the copper-aluminum wiring terminal is used, the copper-aluminum wiring terminal is connected with the aluminum bar or the aluminum terminal through the bolt inserted into the connecting hole, and the free end of the bolt is provided with the nut.

Further, a gasket is arranged between the bolt and the upper side of the flat end.

Further, a flat pad and an elastic pad are sequentially arranged between the screw cap and the lower side of the aluminum plate.

Compared with the prior art, the utility model has the following beneficial technical effects:

the copper-aluminum wiring terminal takes copper as a main body, so that the copper-core cable is conveniently lapped with an aluminum terminal or an aluminum bar, and the defect that the existing copper-aluminum wiring terminal can only be connected with the aluminum-core cable is overcome; the problem that a transition piece needs to be added when the copper terminal is connected with the aluminum terminal when the copper terminal is adopted is also solved.

Furthermore, the aluminum plate is welded below the flat end by brazing, so that the welding area is increased, the welded joint is good in forming, good in conductivity and corrosion resistance and good in tensile and shear resistance; the risk of the copper-aluminum wiring terminal breaking at the copper-aluminum welding seam is avoided.

Furthermore, the lower surface of the flat end, the transition end and the lower surface of the round pipe end are positioned on the same plane, and the transition end or the round pipe end can be directly placed on other terminals, so that the copper-aluminum wiring terminal can be tightly contacted with other terminals or busbars, and no gap is generated between the flat end and other terminals. Be convenient for and the mounting hole is connected from the great terminal of terminal limit distance or copper bar, can not let transition end or pipe end influence flush end and mounting hole from being connected of the great terminal of terminal limit distance.

Furthermore, the round pipe end flaring provided by the utility model is convenient for inserting a plurality of strands of soft copper stranded wires.

Furthermore, the utility model has simple and convenient installation, saves the copper-aluminum transition piece and reduces the material cost.

Drawings

FIG. 1 is a schematic view of a conventional terminal block; wherein (a) is a front view; (b) is a top view;

FIG. 2 is a schematic view of a conventional terminal connection;

FIG. 3 is a schematic structural diagram of a first prior art solution;

FIG. 4 is a schematic structural diagram of a second prior art;

FIG. 5 is a schematic structural diagram of a third prior art solution;

FIG. 6 is a schematic structural view of the copper-aluminum connection terminal of the present invention; wherein (a) is a front view; (b) is a top view;

fig. 7 is a schematic view of the connection mode of the copper-aluminum connection terminal of the utility model.

In the figure, 1, an aluminum body; 2. a copper body; 10. an aperture; 11. a wiring board; 12. an aluminum connecting plate; 13. a transition plate; 14. a slope surface; 15. a terminal main body; 16. an aluminum fixing plate; 17. making a pipe from aluminum; 3. connecting holes; 4. an aluminum plate; 5. a main body DT copper terminal; 6. an aluminum row or terminal; 7. a bolt; 8. a nut; 2-1, round tube end; 2-2, flat end; 2-3, transition end; 2-4, flaring.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model relates to a copper-aluminum wiring terminal which comprises a main body DT copper terminal 5 and an aluminum plate 4. The aluminum plate 4 is fixed below the flat end 2-2 through brazing, the contact surface of copper and aluminum is large, the connection is reliable, the overall tensile strength is high, and the aluminum plate is not easy to break. The internal chamfer at the 2-1 part of the round pipe end of the copper-aluminum wiring terminal plays a role in reaming and is convenient for connection with a soft copper stranded wire. The copper-aluminum integration is convenient to install, the use of copper-aluminum transition pieces is reduced, and the cost is reduced.

Referring to fig. 5, the structure of the present invention is schematically illustrated, which includes a main body DT copper terminal 5 and an aluminum plate 4. The main body DT copper terminal 2 is formed by punching a round pipe end 2-1 (copper pipe), a flat end 2-2 and a transition end 2-3 into a whole. The lower surface of the flat end 2-2 and the lower surfaces of the round pipe end 2-1 and the transition end 2-3 are on the same plane, so that the lap joint area can be increased, and the transition end or the round pipe end can be directly placed on other terminals, so that the terminal can be in close contact with other terminals or busbars, and no gap is generated between the flat end and other terminals. Be convenient for and the mounting hole is connected from the great terminal of terminal limit distance or copper bar, can not let transition end or pipe end influence flush end and mounting hole from being connected of the great terminal of terminal limit distance. The transition end 2-3 is arc-shaped, so that the copper pipe is prevented from being broken during stamping. Chamfering is carried out in the pipe orifice of the round pipe end 2-1, the pipe orifice is enlarged to form a flared opening 2-4, and the insertion of multiple strands of soft copper stranded wires is facilitated. And processing an aluminum plate 4 according to the shape and the size of the flat end 2-2 of the main DT copper terminal 2, wherein the thickness of the aluminum plate is 1-1.5 mm. The aluminum plate is thin, the aluminum plate 1 is welded on the lower surface of the flat end 2-2 by brazing, the aluminum plate is welded with the whole flat end 2-2, the welding surface is enlarged, and the connecting hole 3 is formed after the welding is complete, so that the flat end 2-2 of the DT copper terminal and the hole of the aluminum plate 1 are ensured to be on the same axis, and the phenomenon that the size of the formed hole is reduced due to overflow of a brazing filler metal of a welding seam at the connecting hole when the connecting hole is firstly formed and then welded can be avoided; or the brazing filler metal at the connecting hole is insufficient, a gap is formed between the flat end 2-2 and the aluminum plate 1, the contact resistance is increased, and the phenomenon of operation heating is caused. And finally, carrying out surface treatment.

The brazing filler metal is used as an intermediate medium to weld copper and aluminum together, metallurgical reaction occurs in the welding process, the brazing filler metal permeates into molecular structures of the copper material and the aluminum material through capillary action, so that the welding is firmer, and the brazing temperature is lower than the melting temperature of the welding, so that the welded joint is better in forming, and good in conductivity and corrosion resistance. Compared with the prior art, the aluminum plate is welded below the flat end of the integral copper terminal, the integrity of the terminal is unchanged, the tensile and shear resistance performance is good, and the condition that the terminal is broken at the position of a copper-aluminum welding seam can be avoided.

The copper-aluminum wiring terminal provided by the utility model takes copper as a main body, so that the copper-core cable is conveniently lapped with an aluminum terminal or an aluminum bar, and the defect that the existing copper-aluminum wiring terminal can only be connected with the aluminum-core cable is overcome.

Referring to fig. 6, after the copper-aluminum wiring terminal is formed, the copper-aluminum wiring terminal is directly lapped with an aluminum bar or an aluminum terminal 6 by using a bolt 7, a nut 8 and related components, so that the connection is convenient, the use of copper-aluminum transition pieces can be reduced, and the cost is reduced.

The above description is only one embodiment of the present invention, and not all or only one embodiment, and any equivalent alterations to the technical solutions of the present invention, which are made by those skilled in the art through reading the present specification, are covered by the claims of the present invention.

Claims (8)

1. The copper-aluminum wiring terminal is characterized by comprising a main body DT copper terminal (5) and an aluminum plate (4), wherein the main body DT copper terminal (5) comprises a round pipe end (2-1), a transition end (2-3) and a flat end (2-2), the round pipe end (2-1), the transition end (2-3) and the flat end (2-2) are integrally formed through punching, the aluminum plate (4) is welded on the lower side of the flat end (2-2) through brazing, and the aluminum plate (4) and the flat end (2-2) are provided with connecting holes (3) which are the same in size and coaxial.

2. A copper-aluminum terminal according to claim 1, characterized in that the lower surfaces of the round pipe end (2-1), the transition end (2-3) and the flat end (2-2) are located on the same plane.

3. A copper-aluminium terminal according to claim 1, characterised in that the transition ends (2-3) are of circular arc configuration.

4. A copper-aluminium terminal according to claim 1, characterised in that the free end of the round tube end (2-1) is provided with a flared mouth (2-4).

5. The copper-aluminum wire connecting terminal according to claim 1, wherein the thickness of the aluminum plate (4) is 1-1.5 mm.

6. The copper-aluminum wire connecting terminal according to claim 1, characterized in that, in use, the copper-aluminum wire connecting terminal is connected with an aluminum bar or an aluminum terminal (6) through a bolt (7) inserted in the connecting hole (3), and a nut (8) is arranged at the free end of the bolt (7).

7. A copper-aluminium terminal according to claim 6, characterised in that a spacer is arranged between the bolt (7) and the upper side of the flat end (2-2).

8. The copper-aluminum connecting terminal according to claim 6, characterized in that a flat pad and a spring pad are arranged between the nut (8) and the underside of the aluminum plate (4) in sequence.

Images