JPH0595015U - Conductor for winding wire of electrical equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To construct a winding lead-out conductor that connects between an aluminum winding conductor and a copper conductor without plating for electrolytic corrosion prevention. [Structure] A winding-side conductor 16 made of aluminum or an aluminum alloy and a drawing-side conductor 17 made of copper are friction-welded to form a winding-drawing conductor 15. Winding side conductor 1
A connecting portion 16a for connecting a winding conductor is formed on the wire 6, and a screw hole is provided in the shaft core portion of the lead-out side conductor 17. When connecting the lead-out side conductor 17 to the center conductor 5 of the bushing 2, the screw provided on the center conductor 5 is directly screwed into the screw hole of the lead-out side conductor 17.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a conductor for drawing out a winding wire of an electric device used for connecting a winding wire of an electric device such as a transformer to a metal fitting made of copper such as a terminal fitting and a central conductor of a bushing.

[0002]

[Prior Art]

 When aluminum or aluminum alloy is used for the winding conductor of electric equipment such as a transformer, if the winding conductor is connected to a copper conductor such as a terminal metal fitting or the center conductor of a bushing, aluminum and copper are different. The metal contact causes an electrolytic corrosion effect, which corrodes the connection part.

In order to prevent this, conventionally, a connection structure as shown in FIG. 3 has been adopted. In FIG. 3, reference numeral 1 is a winding conductor drawn out from the end portion of a winding (not shown), and this winding conductor is made of aluminum or aluminum alloy. Reference numeral 2 denotes a bushing attached to a case 3 accommodating an electric device. The bushing is attached to a porcelain bushing 4, a central conductor 5 provided through the porcelain bushing 4, and an outer end portion of the central conductor 5. It consists of terminal fittings 6. A screw is provided on the outer circumference of the end of the central conductor 5 of the bushing on the electric device side, and the central conductor 5 is fastened to the porcelain tube 4 by a nut 7 screwed onto the screw.

Reference numeral 8 denotes a winding lead-out conductor formed of the same material as that of the winding conductor 1 in an inverted L shape. This winding lead-out conductor has a hole through which the center conductor passes, as shown in FIG. 8a is formed at one end, and a plating layer 8b for preventing electrolytic corrosion is formed so as to cover a portion of the conductor 8 near one end.

The winding drawing conductor 8 is arranged with the end portion of the center conductor 5 fitted in the hole 8 a, and is brought into contact with the nut 9 screwed into the threaded portion of the center conductor 5, It is connected to the central conductor 5 by tightening a nut 11 screwed to the end of the screw portion of No. 5. In order to prevent the nut 11 from bending, one or several disc-shaped spring washers 12 as shown in FIG. 5 are inserted between the nut 11 and the lead conductor 8.

[0006]

[Problems to be solved by the device]

 Since the winding conductor 1 made of aluminum or an aluminum alloy is connected to the portion 8c near the other end of the winding drawing conductor 8 shown in FIG. 3 by welding or the like, the plating layer 8b is avoided by avoiding this portion 8c. Need to be formed. Therefore, when forming the plating layer 8b, it is necessary to mask the portion 8c which is not subjected to the plating treatment, which is troublesome.

Further, in order to form a plated layer for preventing electrolytic corrosion, it is necessary to sequentially perform a plurality of plating treatments such as zinc plating, nickel plating, and tin plating on aluminum, so that the number of man-hours for the plating treatment is large. It was unavoidable that the number of conductors 8 was very large and the manufacturing cost of the conductor 8 for drawing out the winding wire was high.

Further, since the winding lead-out conductor 8 is made of aluminum, if the nut 11 is tightened when connecting the conductor to the central conductor 5 of the bushing, the conductor 8 is deformed over time. As a result, the tightening force of the nut may decrease, and the contact resistance between the winding drawing conductor 8 and the center conductor 5 may increase. Therefore, conventionally, it is necessary to insert a special disc spring 12 as shown in FIG. 5 between the nut 11 and the winding drawing conductor 8 to maintain the tightening force of the nut 11, so that the number of parts is large. There was a problem of becoming.

Further, when the winding lead-out conductor 8 and the winding conductor 1 are connected by welding, in order to prevent the plating layer 8b from being destroyed by heat applied to the conductor 8 during welding, Since it is necessary to lengthen the length of the portion 8c which is not subjected to the winding, it is unavoidable that the length of the winding drawing conductor 8 becomes long.

[0010]

[Means for Solving the Problems]

 The present invention relates to a winding lead-out conductor of an electric device for connecting a winding conductor of an electric device made of aluminum or an aluminum alloy and a copper conductor.

The winding lead-out conductor according to the present invention comprises a winding-side conductor made of aluminum or an aluminum alloy and a copper-made lead-out side conductor friction-welded to the winding-side conductor. The winding-side conductor is provided with a winding-conductor connecting portion to which the winding conductor is connected, and the lead-out-side conductor is provided with a screw hole into which a screw for connecting the copper conductor is screwed.

The screw for connecting the copper conductor may be provided on the copper conductor itself or may be a screw provided separately from the copper conductor.

Friction welding means welding two members by frictional heat generated at the contact portions of the two parts when the two metal members are brought into contact with each other at a predetermined pressure while being relatively rotated.

[0014]

[Action]

 As described above, when aluminum or an aluminum alloy and copper are friction-welded, the oxide film of aluminum is completely removed during welding, so that the electrical resistance of the connection between the two is extremely small. When aluminum or aluminum alloy and copper are friction-welded, the joint strength between them is so strong that they do not break. Therefore, according to the present invention, it is possible to obtain a winding drawing conductor having ideal electrical and mechanical characteristics.

Further, since the aluminum or aluminum alloy and the copper form an alloy at the friction-welded joint, there is no possibility of electrolytic corrosion occurring at the joint.

[0016]

【Example】

 1 (A) and 1 (B) show an embodiment of the present invention. FIG. 1 (A) is drawn out from a terminal portion of a winding wire of an electric device such as a transformer housed in a case 3. The winding conductor 1 and the central conductor of the bushing 2 attached to the case 3 are connected by the winding conductor 15 according to the present invention. The bushing 2 is similar to that shown in FIG. The central conductor 5 including the metal fitting 6 is fastened to the porcelain bushing 4 by tightening a nut 7 screwed into a screw portion provided on the central conductor.

As shown in FIGS. 2A, 2B and 2C, the winding lead-out conductor 15 according to the present invention includes a winding side conductor 16 made of aluminum or an aluminum alloy and the winding side conductor 16. And a copper-made lead-out side conductor 17 friction-welded to. In this embodiment, the winding-side conductor 16 and the extraction-side conductor 17 are both made of a round bar, and both materials are brought into contact with each other at a predetermined pressure while being relatively rotated while sharing the central axis. And friction welded. A screw hole 17a is formed in the shaft core of the lead-out side conductor 17 and opens at the end face of the lead-out side conductor. The screw hole 17a may be formed after the winding side conductor 16 and the extraction side conductor 17 are friction-welded, or may be formed in advance before the both are friction-welded.

After the conductor 16 on the winding side and the conductor 17 on the lead-out side are friction-welded, the tip of the conductor 16 on the winding side is crushed by pressing to form a flat winding conductor connecting portion 16a.

The winding drawing conductor 15 is connected to the central conductor 5 by screwing a threaded portion of the central conductor 5 of the bushing into a screw hole 17 a provided in the drawing side conductor 17. A lock nut 18 is screwed into the threaded portion of the center conductor 5, and the lock nut is tightened with respect to the lead-out side conductor 17 to prevent the winding lead-out conductor 15 from loosening.

After the winding lead-out conductor 15 is connected to the center conductor 5 of the bushing, the winding-side conductor 16 is made of aluminum or an aluminum alloy in the winding conductor connecting portion 16a at the tip of the winding-side conductor 16 (the winding lead-out conductor). The winding conductor 1 (of the same material as 15) is connected by welding.

When the winding lead-out conductor 15 is configured as described above, it is not necessary to perform a troublesome plating process, and thus the cost of the winding lead-out conductor can be reduced. Further, since the screw for connecting the copper conductor is directly screwed into the screw hole 17a of the lead-out conductor 17 made of copper, the tightening force can be maintained without using a disc spring. Therefore, the number of parts can be reduced, and the cost of the lead-out portion of the winding conductor can be reduced.

Further, as described above, when aluminum or aluminum alloy and copper are friction-welded to each other, the two form an alloy and are joined, so that there is no possibility of causing electrolytic corrosion at the joint portion between the two. In addition, the mechanical joining strength between the two can be increased, and a conductor for drawing out a winding wire having excellent mechanical and electrical characteristics can be obtained.

In the above example, a round bar is used as the material of the winding-side conductor 16 and the extraction-side conductor 17, but these materials may be of any shape that can be rotated by a friction welding machine.

Further, the winding conductor connecting portion 16a may have any shape suitable for connecting the winding conductor 1 by welding or the like.

In the above embodiment, the case where the winding conductor 1 and the central conductor of the bushing are connected has been taken as an example, but an appropriate copper conductor other than the central conductor of the bushing, for example, a terminal fitting made of copper. The winding lead-out conductor of the present invention can also be applied to the case where an aluminum winding conductor is connected to.

[0026]

[Effect of the device]

 As described above, according to the present invention, since the winding-side conductor made of aluminum or aluminum alloy and the extraction-side conductor made of copper are friction-welded, there is no risk of electrolytic corrosion and the electrical resistance is extremely high. It is possible to obtain a conductor for pulling out a winding which is extremely small and has a sufficiently high mechanical strength.

Further, according to the present invention, the lead-side conductor is connected to the copper conductor by directly screwing the screw for connecting the copper conductor into the screw hole provided in the lead-side conductor, so that a disc spring is not used. However, the required tightening force can be maintained and the number of parts can be reduced.

[Brief description of drawings]

FIG. 1A is a front view showing an example in which a winding conductor and a center conductor of a bushing are connected by a winding drawing conductor according to the present invention. FIG. 6B is a side view of a main portion showing a connecting portion between the winding lead conductor and the winding conductor shown in FIG.

2 (A), (B) and (C) are a front view, a side view and a top view, respectively, showing an embodiment of a winding lead-out conductor of the present invention.

FIG. 3 is a front view showing a state in which a winding conductor and a central conductor of a bushing are connected by a conventional winding drawing conductor.

FIG. 4 is a perspective view of a winding lead-out conductor used in the example of FIG.

5 is a front view showing a disc spring used in the example of FIG. 3. FIG.

[Explanation of symbols]

1 Winding conductor made of aluminum or aluminum alloy 2 Bushing 4 Insulator tube 5 Bushing center conductor (copper conductor) 6 Terminal fitting 15 Winding lead conductor 16 Winding side conductor made of aluminum or aluminum alloy 17 Leading side conductor made of copper 17a screw hole

Claims (1)

[Scope of utility model registration request] 1. A winding-out conductor for an electric device, which connects between a copper conductor and a winding conductor for an electric device made of aluminum or an aluminum alloy, comprising a winding-side conductor made of aluminum or aluminum alloy and the winding. And a lead-out conductor made of copper friction-welded to the wire-side conductor, the winding-side conductor is provided with a winding conductor connecting portion to which the winding conductor is connected, and the lead-out side conductor is provided with the copper conductor. A conductor for drawing out a winding wire of an electric device, which is provided with a screw hole for screwing a screw for connecting with each other.