JPH0547253A - Roller contact shoe - Google Patents

Abstract

PURPOSE:To improve the joint ratio of silver brazing in a roller contact shoe for switch using a silver sintered alloy. CONSTITUTION:A roller contact shoe 4 for switch is formed by molding a flat silver sintered alloy layer 1 and a base metal layer 3 of a conductive material which are mutually brazed with a silver solder 2 into a recessed form. The joint ratio between the layers 1 and 3 is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller contactor for a switch such as a disconnector or a circuit breaker, which uses a sintered silver alloy.

[0002]

2. Description of the Related Art FIG. 5 shows a structure in which a conventional roller contactor is used in a rotation range portion of a disconnector which is an example of a switch. As shown in the figure, the upper contact bowl 12 is fixed by bolts to a support 15 in which a bearing 14 is inserted, and can rotate with a shaft 16 arranged at the center of the upper contact bowl 12. Further, the lower contact bowl 13 is the lower contact bowl 1
A support 17 to which a shaft 16 arranged in the center of 3 is fixed
It is fixed by bolts. As a result, both the upper contact bowl 12 and the lower contact bowl 13 are rotatable about the shaft 16 as a rotation axis. On the other hand, the roller contactor 11 electrically connects between the upper contact bowl 12 and the lower contact bowl 13, and the pair of roller contacts 11 are concentrically arranged between the upper contact bowl 12 and the lower contact bowl 13. A large number of them are arranged and pressed against the contact portions of the upper contact bowl 12 and the lower contact bowl 13 by the compression springs 18. As a result, the roller contactor 11 follows the rotation of the upper contact bowl 12 between the upper contact bowl 12 and the lower contact bowl 13 due to the opening / closing operation of the disconnector, and constitutes a rolling contact. As shown in FIG. 3, the roller contactor 11 used for the rotary hinge portion of the disconnecting switch is composed of a silver sintered alloy layer 6, a base metal layer 8 of a conductive material, and a silver brazing layer 7, The layer 6 and the base metal layer 8 of the current-carrying material are each formed into a concave shape of the roller contactor 11, and thereafter the silver sintered alloy layer 6 and the base metal layer 8 are connected to the electrodes 9a,
9b pressurizes and heats and joins.

[0003]

However, in the roller contactor 11, the ratio (bonding ratio) in which the silver sintered alloy layer 6 and the base metal layer 8 are bonded and integrated by the silver brazing layer 7 is as follows.
It is affected by the processing accuracy of the joint surface between the silver sintered alloy layer 6 and the base metal layer 8. That is, as shown in FIG. 4A, when the diameter of the joining surface of the base metal layer 8 is smaller than the diameter of the joining surface of the silver sintered alloy layer 6, the case shown in FIG. As shown, when there is an angle difference between the concave bent angle of the joint surface of the silver sintered alloy layer 6 and the concave bent angle of the joint surface of the base metal layer 8 A gap is generated on the surface, and this portion becomes a defective portion that cannot be joined by the silver brazing layer 7. As described above, the conventional roller contactor 11 has a problem that the bonding rate between the silver sintered alloy layer 6 and the base metal layer 8 is poor. Therefore, an object of the present invention is to obtain a switch roller contactor having a good bonding ratio between the silver sintered alloy layer 6 and the base metal layer 8.

[0004]

The roller contact of the present invention solves the above problems by forming a flat plate-shaped silver-sintered alloy layer brazed with silver and a base metal layer of a conductive material into a concave shape. did.

[0005]

In the roller contact of the present invention, the silver brazing is carried out in a flat plate state, so that the molten silver brazing material is filled between the silver sintered alloy and the base of the conductive material without any gap.

[0006]

FIG. 1 is a sectional view of a roller contactor for a switch according to this embodiment. The roller contactor 4 is composed of a silver sintered alloy layer 1 with a silver braze 2 and a base metal layer 3 of a conductive material in a flat plate state,
The ends are formed into the concave shape of the bending roller contacts. This roller contactor 4 has a diameter of the base metal layer 3 which is equal to that of the silver sintered alloy layer 1
The diameter is about 1 mm smaller than the diameter. For this reason,
The melted material 2 with silver brazing protruding to the outside during heating stably rises to the stepped portion due to the difference in diameter,
It is less likely that defective joints at the end face due to defective silver brazing will occur. The concave bending angle A is preferably 50 ° or less. When the bending angle A is 50 ° or less, cracks do not occur on the surface of the roller contactor 4, but as the bending angle A exceeds 50 °, the rate of occurrence of cracks increases.

Next, based on FIGS. 2 (a) and 2 (b),
A method of manufacturing the roller contactor 4 of the present invention will be described.
First, as shown in FIG. 2A, a silver braze is applied between a circular flat plate-shaped silver sintered alloy layer 1 and a base metal layer 3 made of a circular flat plate-shaped current-carrying material having a diameter smaller than this by about 1 mm. Material 2
Insert. Then, the flat plate-shaped upper and lower electrodes 5a, 5b
Then, the silver-sintered alloy layer 1, the silver-brazed layer 2 and the base metal layer 3 of the current-carrying material are laminated and integrated by pressurizing and heating with. Next, the silver-sintered alloy layer 1, the silver brazing layer 2, and the base metal layer 3 which are laminated and integrated are pressed by the uneven electrodes 10a and 10b as shown in FIG. 2B. Mold the roller contact into the roller contact shape.

FIG. 6 is a diagram showing a silver brazing joint rate of a roller contactor and establishment of its occurrence. As you can see in the figure,
The product of the present invention has a higher bonding rate than the conventional product, and most of the products of the present invention were good with respect to the threshold value C of the product having a good bonding ratio and the defective product.

[0009]

As described above, in the roller contactor for a switch of the present invention, the bonding rate with silver brazing is improved and the number of defective products due to defective bonding is small.

[Brief description of drawings]

FIG. 1 is a sectional view of a roller contact of the present invention.

FIG. 2 is a diagram showing a method for manufacturing a roller contact according to the present invention.

FIG. 3 is a diagram showing a method for attaching a silver braze to a roller contactor according to the prior art.

FIG. 4 is a diagram showing an example of a joint failure situation of a conventional product.

FIG. 5 is a cross-sectional view of a disconnector rotary hinge portion.

FIG. 6 is a comparison diagram showing a bonding rate with silver brazing and establishment of occurrence of a product of the present invention and a conventional product.

[Explanation of symbols] 1,6 Sintered silver alloy 2,7 Silver brazing material 3,8 Base metal 4,11 Roller contactor

Claims (1)

[Claims] 1. A roller contactor for a switch, which is formed by molding a flat plate-shaped silver-sintered alloy layer brazed with silver and a base metal layer of a conductive material into a concave shape.