Copper-aluminum transition joint

Abstract

The utility model belongs to the technical field of electrical equipment, and discloses a copper-aluminum transition joint, which comprises a copper joint and an aluminum joint, the copper joint comprises a copper pipe and a first transition pipe, one end of the copper pipe is provided with a first opening, and the other end of the copper pipe is connected with the first transition pipe; the aluminum joint comprises an aluminum pipe and a second transition pipe, one end of the aluminum pipe is provided with a second opening, and the other end of the aluminum pipe is connected with the second transition pipe; the end, away from the first opening, of the first transition pipe is connected with the end, away from the second opening, of the second transition pipe, and the outer surface of the first transition pipe and the outer surface of the second transition pipe are coated with sprayed powder. According to the copper-aluminum transition joint provided by the utility model, connection is realized by utilizing different thermal expansion coefficients of the copper joint and the aluminum structure, and the outer surface of the copper-aluminum transition pipe is coated with the sprayed powder, so that a chemical battery is prevented from being formed at the joint of the copper wire and the aluminum wire, and the copper wire and the aluminum wire are stably connected.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical equipment, in particular to a copper-aluminum transition joint. Background Art

[0002] The external lines of the power grid overhead lines are mostly made of aluminum, and the internal lines are mostly made of copper. In the process of converting the external lines to the internal lines, the problem of connecting the copper wire and the aluminum wire to each other is inevitable. Due to the different electrochemical properties of copper and aluminum, the contact surface of the two metals is very easy to form an electrolyte in the connection gap under the joint action of water, carbon dioxide and other impurities in the air, which will make the copper, aluminum and the electrolyte between the gaps together form a chemical battery with copper as the positive electrode and aluminum as the negative electrode. However, during the connection and use of copper and aluminum wires, the aluminum in the chemical battery will gradually lose electrons and be oxidized, and the resistance of the copper-aluminum contact will continue to increase, which will cause the connection between the copper and aluminum wires to fail easily, and even cause fire accidents due to excessive resistance at the connection. Utility Model Content

[0003] The utility model provides a copper-aluminum transition joint, which is used to solve the problem that the connection between the copper wire and the aluminum wire is prone to form a chemical battery and fail. The copper-aluminum transition joint comprises a copper joint and an aluminum joint;

[0004] The copper joint comprises a copper tube and a first transition tube, one end of the copper tube is provided with a first opening, and the other end of the copper tube is connected to the first transition tube;

[0005] The aluminum joint comprises an aluminum tube and a second transition tube, one end of the aluminum tube is provided with a second opening, and the other end of the aluminum tube is connected to the second transition tube;

[0006] One end of the first transition pipe away from the first opening is connected to one end of the second transition pipe away from the second opening, and the outer surface of the first transition pipe and the outer surface of the second transition pipe are respectively coated with spray powder.

[0007] Furthermore, the copper tube and the first transition tube are made of red copper.

[0008] Furthermore, the aluminum tube and the second transition tube are made of aluminum.

[0009] Furthermore, a first accommodating cavity communicating with the first opening is provided in the copper tube, and a first wire connecting member is provided in the first accommodating cavity;

[0010] A second accommodating cavity communicating with the second opening is disposed in the aluminum tube, and a second wire connecting piece arranged opposite to the first wire connecting piece is disposed in the second accommodating cavity.

[0011] Further, the first wire connector includes a first through hole and a first screw, and the first screw is inserted into the first through hole;

[0012] The second wire connector includes a second through hole and a second screw, and the second screw is inserted into the second through hole.

[0013] Further, the first screw includes a first screw head and a first screw shaft, and the first screw shaft is provided with a first external thread;

[0014] The second screw comprises a second screw head and a second screw shank, and the second screw shank is provided with a second external thread;

[0015] The copper tube is provided with a first internal thread that cooperates with the first external thread, and the aluminum tube is provided with a second internal thread that cooperates with the second external thread.

[0016] Furthermore, the first screw head and the second screw head are respectively provided with grooves, and the grooves are in a straight shape or a cross shape.

[0017] Furthermore, the inner diameter of the copper tube is the same as the outer diameter of the first transition tube, and the inner diameter of the aluminum tube is the same as the outer diameter of the second transition tube.

[0018] Furthermore, the thermal expansion coefficient of the copper joint is greater than the thermal expansion coefficient of the aluminum joint.

[0019] Furthermore, the material of the powder spraying is a non-metallic insulating material.

[0020] Compared with the prior art, the utility model provides a copper-aluminum transition joint, including a copper joint and an aluminum joint, which realizes connection by utilizing the different thermal expansion coefficients of the copper joint and the aluminum structure, and is coated with powder on the outer surface of the copper-aluminum transition tube to prevent the formation of a chemical battery at the connection between the copper wire and the aluminum wire, thereby stably connecting the copper wire and the aluminum wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a copper-aluminum transition joint provided in an embodiment of the utility model;

[0022] Figure 2 A first cross-sectional view of a copper-aluminum transition joint provided in an embodiment of the utility model;

[0023] Figure 3 A second cross-sectional view of a copper-aluminum transition joint provided in an embodiment of the utility model.

[0024] Among them, 10 is a copper joint, 11 is a copper tube, 12 is a first transition tube, 13 is a first opening, 20 is an aluminum joint, 21 is an aluminum tube, 22 is a second transition tube, 23 is a second opening, 30 is a powder coating protective layer, 40 is a first accommodating cavity, 41 is a first wire connecting piece, 411 is a first through hole, 412 is a first screw, 413 is a first screw head, 414 is a first screw rod, 415 is a first external thread, 50 is a second accommodating cavity, 51 is a second wire connecting piece, 511 is a second through hole, 512 is a second screw, 513 is a second screw head, 514 is a second screw rod, and 515 is a second external thread. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] In order to make the description of the disclosed content more detailed and complete, the following is an illustrative description of the implementation method and specific examples of the utility model; however, this is not the only form of implementing or using the specific examples of the utility model. The implementation method covers the features of multiple specific examples and the method steps and their sequence for constructing and operating these specific examples. However, other specific examples can also be used to achieve the same or equal functions and step sequences. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0028] In the description of the embodiments of the present invention, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two, and other quantifiers are similar. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention, and the embodiments of the present application and the features in the embodiments may be combined with each other without conflict.

[0029] In order to solve the problem that the connection between the existing copper wire and the aluminum wire is prone to form a chemical battery and fail, the utility model provides a copper-aluminum transition joint, please refer to Figure 1 , is a structural schematic diagram of a copper-aluminum transition joint provided by an embodiment of the utility model, the copper-aluminum transition joint comprises a copper joint 10 and an aluminum joint 20; the copper joint comprises a copper tube 11 and a first transition tube 12, one end of the copper tube 11 is provided with a first opening 13, and the other end of the copper tube 11 is connected to the first transition tube 12; the aluminum joint 20 comprises an aluminum tube 21 and a second transition tube 22, one end of the aluminum tube 21 is provided with a second opening 23, and the other end of the aluminum tube 21 is connected to the second transition tube 22; an end of the first transition tube 12 away from the first opening 13 is connected to an end of the second transition tube 22 away from the second opening 23, and the outer surfaces of the first transition tube 12 and the outer surfaces of the second transition tube 22 are respectively coated with spray powder.

[0030] Specifically, in the embodiment of the utility model, first, the outer surfaces of the first transition tube 12 and the second transition tube 22 are cleaned; secondly, the copper joint 10 and the aluminum joint 20 are heated to a certain temperature to cause the copper metal and the aluminum metal to expand. When a certain temperature is reached, the connecting surfaces of the first transition tube 12 and the second transition tube 22 are contacted together and a certain pressure is applied to make the connecting surfaces fully contact; then, the pressure of the first transition tube 12 and the second transition tube 22 is kept unchanged, and the temperature is gradually reduced until the copper-aluminum transition joint is cooled to room temperature. During the cooling process, the first transition tube 12 and the second transition tube 22 will produce slight deformation, thereby achieving connection; finally, the surface of the copper-aluminum transition joint is powder-sprayed by a powder spraying process, and a powder-sprayed protective layer 30 is formed on the outer surfaces of the first transition tube 12 and the second transition tube 22, so that the connection between the copper-aluminum transition joint is completely sealed by the powder-sprayed protective layer 30 and completely isolated from the air. In the embodiment of the utility model, the copper-aluminum transition joint utilizes the different thermal expansion coefficients of the copper joint 10 and the aluminum joint 20 to achieve connection, and powder is coated on the outer surface of the copper-aluminum transition tube to prevent the formation of a chemical battery at the connection between the copper wire and the aluminum wire, thereby stably connecting the copper wire and the aluminum wire.

[0031] As a further preferred embodiment, the copper tube 11 and the first transition tube 12 are made of red copper. In the embodiment of the utility model, since red copper has good electrical conductivity, thermal conductivity and weldability, and has good corrosion resistance in the atmosphere, the copper tube 11 and the first transition tube 12 can be made into copper joints through cold and hot plastic processing.

[0032] As a further preferred embodiment, the aluminum tube 21 and the second transition tube 22 are made of aluminum. In the embodiment of the utility model, the copper-aluminum transition joint is made of two different materials, one end is made of copper, and the other end is made of aluminum. When in use, the copper head is connected to the copper wire, and the aluminum head is connected to the aluminum wire, so that the copper wire and the aluminum wire are connected to the same potential during on-site wiring, and no chemical battery is formed between the wire and the joint.

[0033] As a further preferred option, please refer to Figure 2 , is a first cross-sectional view of a copper-aluminum transition joint provided by an embodiment of the utility model, wherein the copper tube 11 is provided with a first accommodating cavity 40 communicating with the first opening 13, and the first accommodating cavity 40 is provided with a first wire connector 41; the aluminum tube 21 is provided with a second accommodating cavity 50 communicating with the second opening 23, and the second accommodating cavity 50 is provided with a second wire connector 51 arranged opposite to the first wire connector 41. In the embodiment of the utility model, the copper joint 10 and the aluminum joint 20 are respectively provided with wire connectors for connecting the copper joint 10 with the copper wire and the aluminum joint 20 with the aluminum wire.

[0034] As a further preferred option, please refer to Figure 3 , which is a second cross-sectional view of a copper-aluminum transition joint provided by an embodiment of the utility model, the first wire connector 41 includes a first through hole 411 and a first screw 412, and the first screw 412 is inserted into the first through hole 411; the second wire connector 51 includes a second through hole 511 and a second screw 512, and the second screw 512 is inserted into the second through hole 511. In the embodiment of the utility model, a through hole is provided in the wire connector for placing external copper wires and aluminum wires, and the copper wires and aluminum wires are fixed in the wire connector by screws.

[0035] As a further preferred embodiment, the first screw 412 includes a first screw head 413 and a first screw rod 414, and the first screw rod 414 is provided with a first external thread 415; the second screw 512 includes a second screw head 513 and a second screw rod 514, and the second screw rod 514 is provided with a second external thread 515; the copper tube 11 is provided with a first internal thread (not shown in the figure) that cooperates with the first external thread 415, and the aluminum tube 21 is provided with a second internal thread (not shown in the figure) that cooperates with the second external thread 515, wherein the external thread on the screw cooperates with the internal threads of the copper tube and the aluminum tube, so that the screw is fixed in the copper tube and the aluminum tube.

[0036] As a further preferred embodiment, the first screw head 413 and the second screw head 513 are respectively provided with grooves, and the grooves are in a straight line or a cross shape. In the embodiment of the utility model, grooves are provided on the screw heads to facilitate tightening and fixing the screws.

[0037] As a further preferred embodiment, the inner diameter of the copper tube 11 is the same as the outer diameter of the first transition tube 12, and the inner diameter of the aluminum tube 21 is the same as the outer diameter of the second transition tube 22. In the embodiment of the utility model, the copper tube and the aluminum tube are integrally formed with the transition tube, and the inner diameters of the copper tube and the aluminum tube are the same as the outer diameter of the transition tube, so as to prevent the generation of electrolyte in the gap between the copper tube and the transition tube.

[0038] As a further preferred embodiment, the thermal expansion coefficient of the copper joint 10 is greater than the thermal expansion coefficient of the aluminum joint 20. In the embodiment of the utility model, due to the difference in expansion coefficients of copper metal and aluminum metal, the expansion coefficient of copper metal is greater than the expansion coefficient of aluminum metal, and copper and aluminum produce slight deformation during heating and cooling to achieve connection.

[0039] As a further preferred embodiment, the powder spraying material is a non-metallic insulating material. In the embodiment of the utility model, a powder spraying process is added at the connection of the copper-aluminum transition joint, and the powder spraying material is a non-metallic insulating material, which effectively prevents the formation of electrochemical cells.

[0040] The utility model discloses a copper-aluminum transition joint, including a copper joint and an aluminum joint; the copper joint includes a copper tube and a first transition tube, one end of the copper tube is provided with a first opening, and the other end of the copper tube is connected to the first transition tube; the aluminum joint includes an aluminum tube and a second transition tube, one end of the aluminum tube is provided with a second opening, and the other end of the aluminum tube is connected to the second transition tube; an end of the first transition tube away from the first opening is connected to an end of the second transition tube away from the second opening, and the outer surfaces of the first transition tube and the outer surfaces of the second transition tube are respectively coated with powder. The utility model utilizes the different thermal expansion coefficients of the copper joint and the aluminum structure to achieve connection, and the outer surface of the copper-aluminum transition tube is coated with powder, which prevents the formation of a chemical battery at the connection between the copper wire and the aluminum wire, thereby stably connecting the copper wire and the aluminum wire.

[0041] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0042] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A copper-aluminum transition joint, characterized in that: Includes copper and aluminum connectors; The copper joint comprises a copper tube and a first transition tube, one end of the copper tube is provided with a first opening, and the other end of the copper tube is connected to the first transition tube; The aluminum joint comprises an aluminum tube and a second transition tube, one end of the aluminum tube is provided with a second opening, and the other end of the aluminum tube is connected to the second transition tube; One end of the first transition pipe away from the first opening is connected to one end of the second transition pipe away from the second opening, and the outer surface of the first transition pipe and the outer surface of the second transition pipe are respectively coated with spray powder.

2. The copper-aluminum transition joint according to claim 1, characterized in that: The copper tube and the first transition tube are made of red copper.

3. The copper-aluminum transition joint according to claim 1, characterized in that: The aluminum tube and the second transition tube are made of aluminum.

4. The copper-aluminum transition joint according to claim 3 is characterized in that: A first accommodating cavity communicating with the first opening is provided in the copper tube, and a first wire connecting piece is provided in the first accommodating cavity; A second accommodating cavity communicating with the second opening is disposed in the aluminum tube, and a second wire connecting piece arranged opposite to the first wire connecting piece is disposed in the second accommodating cavity.

5. The copper-aluminum transition joint according to claim 4, characterized in that: The first wire connector includes a first through hole and a first screw, and the first screw is inserted into the first through hole; The second wire connector includes a second through hole and a second screw, and the second screw is inserted into the second through hole.

6. The copper-aluminum transition joint according to claim 5, characterized in that: The first screw comprises a first screw head and a first screw shaft, and the first screw shaft is provided with a first external thread; The second screw comprises a second screw head and a second screw shank, and the second screw shank is provided with a second external thread; The copper tube is provided with a first internal thread that cooperates with the first external thread, and the aluminum tube is provided with a second internal thread that cooperates with the second external thread.

7. The copper-aluminum transition joint according to claim 6, characterized in that: The first screw head and the second screw head are respectively provided with grooves, and the grooves are in a straight shape or a cross shape.

8. The copper-aluminum transition joint according to claim 7, characterized in that: The inner diameter of the copper tube is the same as the outer diameter of the first transition tube, and the inner diameter of the aluminum tube is the same as the outer diameter of the second transition tube.

9. The copper-aluminum transition joint according to claim 1, characterized in that: The thermal expansion coefficient of the copper joint is greater than the thermal expansion coefficient of the aluminum joint.

10. The copper-aluminum transition joint according to claim 1, characterized in that: The material of the powder spraying is a non-metallic insulating material.

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