Copper-aluminum welding structure of transformer

Abstract

The utility model relates to the technical field of transformers, in particular to a transformer copper-aluminum welding structure which comprises an enameled aluminum wire and a copper wire, an aluminum wire welding position is arranged at one end of the enameled aluminum wire, the aluminum wire welding position is an aluminum wire with an enameled layer removed, a first tinned copper wire is tightly wound on the surface of the aluminum wire with the enameled layer removed, and a second tinned copper wire is tightly wound on the surface of the first tinned copper wire. A copper wire welding position is arranged at one end of the copper wire, an oxide layer on the surface of the copper wire is removed from the copper wire welding position, a second tinned copper wire is tightly wound on the surface of the copper wire with the oxide layer on the surface of the copper wire removed, the aluminum wire welding position and the copper wire welding position are in lap joint, and a third tinned copper wire is tightly wound at the lap joint. According to the utility model, the tinned copper wires 1 and 2 with the diameter of 0.5 mm are wound at the welding positions of the enameled aluminum wire and the copper wire, the tinned copper wire 1 and the tinned copper wire 2 at the lap joint are bundled by tightly winding the tinned copper wire 3 and then are put into a tin furnace together for tinning, so that the tin layer at the welding position is uniform and firm; the problem of interface oxidation during welding of the copper wire and the aluminum wire is effectively solved, and the reliability of a welding joint is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field especially relates to a transformer copper aluminium welding structure. BACKGROUND

[0002] In the transformer manufacturing process, the welding of copper wire and aluminum wire is very important. However, the physical and chemical properties of copper and aluminum are significantly different, and direct welding can cause interface oxidation, insufficient welding strength and other problems, resulting in poor reliability of the welded joint. The traditional mechanical connection or welding method using an intermediate transition layer has the disadvantages of complex process, high cost, unstable welding quality and the like. Therefore, it is urgent to develop a simple, reliable and low-cost copper-aluminum wire welding structure. SUMMARY

[0003] The utility model provides a kind of transformer copper aluminium welding structure, by pre-plating tin and the mode of winding tin-plated copper wire, effectively solve the interface oxidation problem when copper-aluminum wire is welded, improve the strength and reliability of the welded joint, while meeting the large-scale production demand.

[0004] The technical scheme of the utility model is as follows: a kind of transformer copper aluminium welding structure, including enameled aluminium wire and copper wire, one end of the enameled aluminium wire is provided with aluminium wire welding position, the aluminium wire welding position is the aluminium wire of removing enameled layer, the surface of the aluminium wire of removing enameled layer is tightly wound with tin-plated copper wire one, one end of the copper wire is provided with copper wire welding position, the copper wire welding position is the copper wire of removing copper wire surface oxide layer, the surface of the copper wire of removing copper wire surface oxide layer is tightly wound with tin-plated copper wire two, the aluminium wire welding position and the copper wire welding position are overlapped, and tin-plated copper wire three is tightly wound at the overlapping place.

[0005] Further, the diameters of the tin-plated copper wire one, the tin-plated copper wire two and the tin-plated copper wire three are all 0.5 mm.

[0006] By winding the tin-plated copper wire one with a diameter of 0.5 mm at the enameled aluminium wire welding position first, the welding contact area is increased, and the welding strength is improved.

[0007] The tin-plated copper wire one and the tin-plated copper wire two at the overlapping place are bundled together by tightly winding the tin-plated copper wire three and then put into a tin furnace for tin plating, to ensure that the tin layer at the welding part is uniform and firm.

[0008] Further, the overlapping length is 10-20 mm.

[0009] Further, the cross section of the enameled aluminium wire is 3 mm 2 -12 mm 2 .

[0010] Further, the winding lengths of the tin-plated copper wire one and the tin-plated copper wire two are 10-20 mm.

[0011] The preparation of the transformer copper-aluminum wire welding structure comprises the following steps:

[0012] 1. Pretreatment of enameled aluminum wire: remove the enamel layer at the welding position of the enameled aluminum wire to expose the aluminum wire surface.

[0013] 2. Wrapping tinned copper wire: wrap a 0.5mm diameter tinned copper wire around the exposed aluminum wire surface to ensure that the tinned copper wire is in close contact with the aluminum wire.

[0014] 3. Aluminum wire pre-tinning treatment: pre-tinning treatment is performed on the end of the enameled aluminum wire wrapped with tinned copper wire to evenly cover the aluminum wire and tinned copper wire surfaces with a layer of tin.

[0015] 4. Copper wire pretreatment: clean the end of the copper wire to be welded to remove surface oxidation layer and impurities.

[0016] 5. Copper pre-tinning treatment: wrap a 0.5mm diameter tinned copper wire around the exposed aluminum wire surface to ensure that the tinned copper wire is in close contact with the aluminum wire.

[0017] 6. Welding operation: overlap the tinned aluminum wire and copper wire, wrap a 0.5mm diameter tinned copper wire around the overlap to maintain appropriate pressure, and place it in a tin furnace to ensure the firmness and conductivity of the welded joint.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1. The utility model effectively solves the interface oxidation problem during copper-aluminum wire welding by wrapping tinned copper wire and pre-tinning treatment, improving the reliability of the welded joint.

[0020] 2. The welded joint has high mechanical strength and conductivity, fully meeting the high requirements of the transformer on the welded joint. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural diagram of the utility model;

[0022] Figure 2 is a structural diagram of the enameled aluminum wire of the utility model;

[0023] Figure 3 is a structural diagram of the copper wire of the utility model;

[0024] Figure 4 is a structural diagram of the enameled aluminum wire and copper wire overlap method of the utility model;

[0025] The reference signs of the individual parts in the drawing are as follows: 1 - enameled aluminum wire, 2 - copper wire, 3 - aluminum wire welding position, 4 - copper wire welding position, 5 - tin-plated copper wire one, 6 - tin-plated copper wire two, 7 - tin-plated copper wire three. DETAILED DESCRIPTION

[0026] It is first to be noted that in the different described embodiments identical parts are provided with identical reference signs or identical component names, wherein the disclosure contained in the entire description is to be transferred by its meaning to the identical parts having the identical reference signs or identical component names. The chosen position indications in the description, such as for example upper, lower, lateral, etc., also refer to the directly described and shown drawing and are to be transferred by their meaning to the new position in case of a change of position.

[0027] The utility model will be further explained by the drawing and the embodiment below, but not as the basis of the restriction to the utility model.

[0028] Reference Figures 1-4 The utility model provides a kind of copper aluminum welding structure of transformer, including enameled aluminum wire 1 and copper wire 2, the one end of enameled aluminum wire 1 is provided with aluminum wire welding position 3, aluminum wire welding position 3 is the aluminum wire of removing enameled layer, the aluminum wire of removing enameled layer is tightly wound with tin-plated copper wire one 5 on surface, the one end of copper wire 2 is provided with copper wire welding position 4, copper wire welding position 4 is the copper wire of removing copper wire surface oxide layer, the copper wire of removing copper wire surface oxide layer is tightly wound with tin-plated copper wire two 6 on surface, aluminum wire welding position 3 and copper wire welding position 4 are overlapped, and tin-plated copper wire three 7 is tightly wound at the overlapping place.

[0029] The diameter of tin-plated copper wire one 5, tin-plated copper wire two 6 and tin-plated copper wire three 7 is all 0.5mm.

[0030] By winding diameter 0.5mm tin-plated copper wire one 5 at enameled aluminum wire welding position first, increase welding contact area, improve welding strength.

[0031] Tin-plated copper wire one 5 and tin-plated copper wire two 6 at the overlapping place are tied together after being tightly wound with tin-plated copper wire three 7, and then put into tin furnace to be tinned, to ensure that tin layer of welding part is uniform and firm.

[0032] Overlapping length is 10-20mm.

[0033] The cross section of enameled aluminum wire is 3mm 2 -12mm 2 .

[0034] The winding length of tin-plated copper wire one 5 and tin-plated copper wire two 6 is 10-20mm.

[0035] The preparation of the copper aluminum wire welding structure of transformer of the utility model includes the following steps:

[0036] 1. Pre-treatment of enameled aluminum wire: At the welding position of the enameled aluminum wire, remove the enameled layer to expose the aluminum wire surface.

[0037] 2. Wrapping tinned copper wire: Wrap a 0.5mm diameter tinned copper wire around the exposed aluminum wire surface, ensuring that the tinned copper wire is in close contact with the aluminum wire.

[0038] 3. Aluminum wire pre-tinning treatment: Perform a pre-tinning treatment on the end of the enameled aluminum wire wrapped with the tinned copper wire, resulting in a uniform tin layer covering the surfaces of both the aluminum wire and the tinned copper wire.

[0039] 4. Copper wire pre-treatment: Clean the end of the copper wire to be welded to remove surface oxidation and impurities.

[0040] 5. Copper pre-tinning treatment: Wrap a 0.5mm diameter tinned copper wire around the exposed aluminum wire surface, ensuring that the tinned copper wire is in close contact with the aluminum wire.

[0041] 6. Welding operation: Overlap the tinned aluminum wire and copper wire, wrap a 0.5mm diameter tinned copper wire around the overlap to maintain appropriate pressure, and place it in a tin furnace to ensure the strength and conductivity of the welded joint.

[0042] The above is only a preferred example of the present application, and is not a limitation on the form and substance of the present application. Any equivalent changes and modifications made in accordance with the spirit of the present application shall be considered within the scope of the present application.

Claims

1. A transformer copper-aluminum solder joint structure, characterized by: The application relates to a kind of wire, including enameled aluminium wire and copper wire, one end of the enameled aluminium wire is provided with aluminium wire welding position, the aluminium wire welding position is the aluminium wire of removing enameled layer, the surface of the aluminium wire of removing enameled layer is tightly wound with tin-plated copper wire one, one end of the copper wire is provided with copper wire welding position, the copper wire welding position is the copper wire of removing copper wire surface oxide layer, the surface of the copper wire of removing copper wire surface oxide layer is tightly wound with tin-plated copper wire two, the aluminium wire welding position and the copper wire welding position are overlapped, and tin-plated copper wire three is tightly wound at the overlapping place.

2. The transformer copper-aluminum solder joint structure of claim 1, wherein: The diameter of the tin-plated copper wire one, the tin-plated copper wire two and the tin-plated copper wire three is 0.5mm.

3. The transformer copper-aluminum weld structure of claim 1, wherein: The overlapping length is 10-20mm.

4. The transformer copper-aluminum solder joint structure of claim 2, wherein: The enameled aluminum wire cross section 3mm 2 - 12mm 2 .

5. The transformer copper-aluminum weld structure of claim 3, wherein: The winding length of the tin-plated copper wire one and the tin-plated copper wire two is 10-20mm.

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