WO2018110107A1

WO2018110107A1 - Flexible conductor, and vacuum circuit breaker using flexible conductor

Info

Publication number: WO2018110107A1
Application number: PCT/JP2017/038628
Authority: WO
Inventors: 優馬周藤; 山田　博; 高尚丸山
Original assignee: 三菱電機株式会社
Priority date: 2016-12-15
Filing date: 2017-10-26
Publication date: 2018-06-21
Also published as: JPWO2018110107A1

Abstract

Conventional resistance-welded flexible conductors have the problem of high material cost because a plating treatment is conducted not just on a conducting surface, but on other surfaces as well. The present invention provides a flexible conductor (4) formed from a plurality of copper strips (1), wherein both end portions (1a, 1b) of the plurality of copper strips (1) are bonded to each other to constitute connecting portions (CPa, CPb), a copper plate piece (2)obtained by plating a member such as a flat copper material is welded to outer surfaces of the connecting portions (CPa, CPb), and the copper plate piece (2) is provided only in places corresponding to the conducting surface (3) of the connecting portions (CPa, CPb).

Description

Vacuum breaker using flexible conductor and flexible conductor

The present invention relates to a flexible conductor formed by overlapping flat copper materials made of a plurality of copper strips and the like, and having a connection portion at an end of the flat copper material, and a vacuum circuit breaker using the flexible conductor. Is.

Conventional resistance-welded flexible conductors used in vacuum circuit breakers are formed by superimposing flat copper materials consisting of multiple copper strips with a rectangular cross section, and plating the entire top and bottom copper strips These are processed and welded. The completed resistance welding flexible conductor has a structure in which the entire upper and lower portions of the resistance welding flexible conductor are plated.
Further, a technique is known in which a terminal piece and a copper piece covered with plating are welded in a circuit breaker using a multicore conductor wire, although it is not a vacuum circuit breaker (see Patent Document 1).

JP 2000-149755 A (paragraphs [0073] to [0075], FIGS. 13 to 15)

The outer surface of the resistance-welded flexible conductor is plated with a rare material (eg, silver, tin, etc.) to prevent copper oxidation and to increase the allowable temperature rise limit of the connection surface. However, since rare materials are used for parts other than the current-carrying surfaces that are not necessary, the material cost is increased.
An object of the present invention is to provide a flexible conductor that can reduce the amount of rare materials (eg, silver, tin, etc.) used.

The above-mentioned patent document 1 shows that a copper piece covered with a terminal portion and plating is welded. However, in this patent document 1, a flexible conductor is composed of a multi-core wire, which is acceptable. The flexible conductor portion and the terminal portion are composed of members having different shapes. On the other hand, the flexible conductor of the present invention is formed by superposing a plurality of flat copper materials made of copper strips, etc., and forming a terminal portion using the same member as the flat copper material superposed on a plurality of sheets. is doing.

The flexible conductor according to the present invention is formed by stacking a plurality of flat copper materials extending in a predetermined direction, and connecting the flat copper materials to each other at the ends of the flat copper material to form a connection portion. In addition, a copper plate piece that is plated on the same member as the flat copper material is provided, and the copper plate piece is bonded to the outer surface of the connection portion and provided only at a location corresponding to the current-carrying surface of the connection portion. It is characterized by that.

According to the flexible conductor according to the present invention, the amount of the rare material (silver, tin, etc.) used for the plating process is provided by providing the plated copper plate piece only at the portion corresponding to the current-carrying surface of the connection part. Can be reduced. Moreover, the copper plate part piece has the effect that the member can be shared by using the same member as the flat copper material.

It is a schematic side view of the vacuum circuit breaker using the flexible conductor in Embodiment 1 which concerns on this invention. It is the schematic from the side for demonstrating the flexible conductor in Embodiment 1 which concerns on this invention. It is a side view explaining the principal part of the flexible conductor in Embodiment 1 which concerns on this invention. It is a perspective view for demonstrating the flexible conductor in Embodiment 2 which concerns on this invention. It is a perspective view for demonstrating the flexible conductor in Embodiment 3 which concerns on this invention. It is a perspective view for demonstrating the flexible conductor in Embodiment 4 which concerns on this invention. It is the schematic from the side for demonstrating the flexible conductor in Embodiment 5 which concerns on this invention.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view schematically showing a configuration of a vacuum circuit breaker 100 using a flexible conductor 4. FIG. 2 is a schematic side view for explaining the flexible conductor 4. FIG. 3 is a side view for explaining a main part of the flexible conductor 4.

In FIG. 1, a cylindrical vacuum valve 10 showing a blocking portion of the vacuum circuit breaker 100 accommodates a fixed contact 10 a and a movable contact 10 b that are arranged to face each other in the vacuum vessel. The fixed conductor 10c connected to the fixed contact 10a is led upward and connected to the fixed contact side main circuit conductor 11. On the other hand, the movable conductor 10d connected to the movable contact 10b is led out downward and connected to the movable contact side main circuit conductor 12 by the flexible conductor 4. The movable conductor 10d is configured to be movable up and down by the insulating rod 13, and the fixed contact 10a and the movable contact 10b are opened and closed by moving the movable contact 10b up and down via the movable conductor 10d.

As shown in FIG. 2, the configuration of the flexible conductor 4 in Embodiment 1 of the present invention is a copper strip 1 that is a flat copper material, and an energizing portion that has an area equivalent to the energizing surface 3 of the connecting portion of the flexible conductor. It consists of a copper plate piece 2. The current-carrying copper plate piece 2 is plated on both the front and back surfaces and disposed on the current-carrying surfaces 3 of the connection portions CPa and CPb at both

ends

1 a and 1 b of the copper strip 1. Then, a plurality of copper strips 1 stacked in the range of the welded portion 5 shown in FIG. 3 are resistance-welded to each other, and the current-carrying copper plate piece 2 is integrally resistance-welded to the connection portions CPa and CPb of the copper strip 1.
If the copper strip 1 can be welded, the number of sheets can be freely polymerized up to 1000. However, usually 100 to 400 sheets are polymerized. As the dimensions of the flexible conductor 4, a width of 10 to 200 mm and a length of 50 to 200 mm can be freely manufactured. However, normally used ones have a width of 40 to 100 mm and a length of about 100 to 200 mm. The current-carrying copper plate piece 2 has a width of about 40 to 100 mm and a length of about 15 to 40 mm.
In the figure, the energization surface 3 indicated by a two-dot chain line indicates the energization range of the connecting portions CPa and CPb, and does not mean a physical energization surface. The connecting portions CPa and CPb of the flexible conductor 4 are electrically contact-coupled with the movable conductor 10d of the movable contact 10b and the movable contact side main circuit conductor 12 by pressure contact, and the coupling region is assumed as the energizing surface 3. It is what.
Moreover, in FIG. 3, what was shown by the arrow (welding) shows a welding range, and the line extended below from the welding part 5 is a dimension line which shows a welding range.
In the above description, the copper strip 1 is used as the flat copper material, but a copper foil can be used instead of the copper strip. As for the difference between copper strip and copper foil, as defined in JIS standard JIS H 0500, the copper strip has a uniform wall thickness of 0.1 mm or more, a rectangular cross section, and is supplied in a slit coil shape. The copper foil refers to a rolled product that is supplied in a slit coil shape with a uniform wall thickness of less than 0.1 mm, a rectangular cross section. About the flat copper material which consists of copper foils, the thing of the board thickness of 0.05 mm or more is applicable as the flexible conductor 4. FIG. As described above, in the JIS standard, the cross-sectional shape of the copper strip or the copper foil is a rectangular cross-section and is a quadrangular shape, but in the first embodiment, the corners on both sides in the width direction of the flat copper material, that is, When the cross-sectional shape of the flat copper material is composed of a plane portion parallel to each other and a plate thickness portion side surface at both end portions in the width direction, the intersection of the plane portion and the plate thickness portion side surface includes a rounded portion. . The same applies to each of the following embodiments.

Conventionally, instead of the current-carrying copper plate piece 2, among the plurality of copper strips 1, plating was performed so as to cover the entire surface of the upper and lower copper strips 1. However, the connection portions CPa and CPb are energized. It is possible to reduce the amount of rare materials (silver, tin, etc.) used for the plating process by providing the current-carrying copper plate piece 2 plated only on the surface 3. By using a thin copper plate having the same thickness as that of the copper strip 1, the current-carrying copper plate piece 2 has the effect of reducing the amount of rare materials used in the plating process and sharing the copper strip 1 with the members.

As described above, the flexible conductor 4 according to the first embodiment of the present invention is formed by overlapping a plurality of long flat copper materials made of the copper strip 1 extending in a predetermined direction, and both end portions 1a of the copper strip 1 are formed. 1b, a plurality of copper strips 1 superposed on each other are joined together. The both

end portions

1a and 1b are configured with a connection portion CPa for the movable contact 10b and a connection portion CPb for the movable contact side main circuit conductor 12. Then, the current-carrying copper plate piece 2 plated with a rare material such as silver or tin is joined to the upper outer surface of the connection portions CPa and CPb by welding, and the current-carrying copper plate piece 2 is functionally plated. Is applied by resistance welding only to the portions corresponding to the current-carrying surfaces 3 of the connection portions CPa and CPb, and the plating treatment corresponding to the current-carrying surface 3 on the upper surface of the current-carrying copper plate piece 2 is provided. The surface area thus formed is the same as the area of the region indicated by the current-carrying surface 3.
Due to this configuration, a rare material (silver, tin, etc.) used for the plating process is provided by providing the current-carrying part copper plate piece 2 that has been plated only at the required portions of the current-carrying surface 3 in the connection parts CPa and CPb. It is possible to reduce the amount used. Moreover, the current-carrying copper plate piece 2 uses a thin copper plate having the same thickness as the flat copper material made of the copper strip 1, thereby reducing the amount of rare materials used for the plating process and sharing the copper strip 1 and the members. There is an effect that can be made. A copper foil may be used as a flat copper material instead of the copper strip 1.

Further, the vacuum circuit breaker 100 using the flexible conductor 4 according to the first embodiment of the present invention moves the movable contact 10b up and down, and the vacuum valve 10 having the fixed contact 10a and the movable contact 10b in the vacuum vessel. The insulating rod 13 is connected to the connecting portion CPa provided at one end to the movable contact 10b side, and the connecting portion CPb provided at the other end is connected to the flexible contact 4 connected to the movable contact side main circuit conductor 12; And the fixed contact 10a and the movable contact 10b are opened and closed by the vertical movement of the insulating rod 13, and the flexible conductor 4 includes a plurality of long flat copper materials made of copper strips 1 extending in a predetermined direction. A flat copper material made of a plurality of copper strips 1 which are formed by overlapping each other and overlapped at both ends 1a and 1b of the copper strip 1 is joined to each other by resistance welding. The both

end portions

1a and 1b are configured with a connection portion CPa for the movable contact 10b and a connection portion CPb for the movable contact side main circuit conductor 12. Then, the current-carrying copper plate piece 2 plated with a rare material such as silver or tin is joined to the upper outer surface of the connection portions CPa and CPb by resistance welding, and the current-carrying copper plate piece 2 is functionally plated. It is made to be provided by bonding by resistance welding only at locations corresponding to the current-carrying surfaces 3 of the connection parts CPa and CPb that require treatment, and plating corresponding to the current-carrying surface 3 on the upper surface of the current-carrying part copper plate piece 2. The area of the treated surface is the same as the area of the region indicated by the current-carrying surface 3.
Due to this configuration, a rare material (silver, tin, etc.) used for the plating process is provided by providing the current-carrying part copper plate piece 2 that has been plated only at the required portions of the current-carrying surface 3 in the connection parts CPa and CPb. It is possible to reduce the amount used, and the current-carrying copper plate piece 2 uses a thin copper plate with the same thickness as the flat copper material made of copper strip 1, thereby reducing the amount of rare materials used in the plating process. In addition, there is an effect that it is possible to provide the vacuum circuit breaker 100 using the flat conductor made of the plurality of copper strips 1 and the flexible conductor 4 capable of sharing the member. As a result, the cost can be reduced by about 5% compared to the conventional structure. In addition, as a flat copper material instead of the copper strip 1, a copper foil may be used.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a perspective view for explaining the flexible conductor 4 in the second embodiment.
The configuration other than the specific configuration described in the second embodiment is the same as the configuration in the first embodiment.

In Embodiment 1, although it was the structure which performs a plating process on both the front and back of the electricity supply part copper plate piece 2, in Embodiment 2, it says that only the one surface of the front and back of the electricity supply part copper plate piece 2 is plated. It has a configuration. In the example shown in FIG. 4, the back side of the current-carrying copper plate piece 2 is a surface 6 that is not plated, and the front side is a surface 7 that is plated. The current-carrying copper plate piece 2 plated only on one side is welded to the current-carrying surface 3 portion of the flexible conductor 4.

According to the second embodiment, the flexible conductor 4 is used in a state in which the energization function is ensured if the plating process is performed only on the surface of the energization portion copper plate piece 2 with respect to the energization surface of the connection destination. As a result, the amount of the rare material used for the plating process can be further reduced as compared with the first embodiment.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a perspective view for explaining the flexible conductor 4 in the third embodiment.
The configuration other than the specific configuration described in the third embodiment is the same as the configuration in the first embodiment or the second embodiment described above.

In the first embodiment, the shape of the energizing surface 3 in the connection portions CPa and CPb of the flexible conductor 4 is a quadrangle as shown in FIG. Usually, the shape of the current-carrying surface 3 of the connecting part is often a quadrangle, and in accordance with this, in the first embodiment, the shape of the current-carrying part copper plate piece 2 is also a square.
However, if it is a shape that can be welded to a plurality of copper strips 1, the shape of the current-carrying copper plate piece 2 for performing the plating treatment can be freely changed. The shape is not limited to a rectangle, and may be a polygon such as a pentagon or a hexagon. For vacuum circuit breakers with high rated voltage and above medium pressure, semi-circular shape is selected rather than polygonal shape in order to improve the insulation performance by securing the spatial distance or relaxing the electric field strength while downsizing. May be. For example, a semicircular shape as shown in FIG.

According to the third embodiment, as shown in FIG. 5, the shape of the current-carrying copper plate piece 2 to be plated according to the shape of the current-carrying surface 3 of the connecting portion of the flexible conductor 4 is a square, a semicircle, or the like. It is possible to change freely, and there is an effect that the degree of freedom can be improved.

Embodiment 4 FIG.
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a perspective view for explaining the flexible conductor 4 in the fourth embodiment.
The configuration other than the specific configuration described in the fourth embodiment is the same as the configuration in any of the first to third embodiments described above.

In Embodiment 1, the current-carrying part copper plate piece 2 having the same area as the current-carrying surface 3 in the connection parts CPa and CPb of the flexible conductor 4 is used. Speaking of the function of connection, it is ideal that the current-carrying surface 3 of the connection parts CPa and CPb and the current-carrying part copper plate piece 2 have the same shape and area, but the current-carrying surface 3 of the connection parts CPa and CPb. It is also possible to use a current-carrying copper plate piece 2 that is larger or smaller than the area. Embodiment 4 of this invention is a structure which can change the magnitude | size of the electricity supply part copper plate piece 2 freely, as shown in FIG. Specifically, it can be changed in the range of 50% to 200% of the energization area.

According to the fourth embodiment, it is possible to manufacture the flexible conductor 4 by freely changing the size of the current-carrying copper plate piece 2, and there is an effect that the degree of freedom of manufacturing work can be improved.

Embodiment 5 FIG.
A fifth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a schematic side view for explaining the flexible conductor in the fifth embodiment.
The configuration other than the specific configuration described in the fifth embodiment is the same as the configuration in any of the first to fourth embodiments described above.

In the first to fourth embodiments, the current-carrying part copper plate piece 2 is welded to the part corresponding to the current-carrying surface 3, but the part to be plated as shown in FIG. The flexible conductor 4 is manufactured by performing the plating process only on the portion corresponding to one current-carrying surface 3 on the uppermost surface of the plurality of copper strips 1 instead of the piece 2.
When the current-carrying surface 3 of the connecting portion is required on the lower surface, the plating process is performed on the portion that becomes the current-carrying surface of the lowermost connecting portion. The reason for adopting such a configuration is that, in the case of a current-carrying surface that has been subjected to plating, the allowable temperature rise value can be set high in the standard, and the degree of freedom in design is improved. For example, when the connecting portion (current-carrying surface) is a copper base (no plating treatment), the allowable temperature rise value is 50 ° C., whereas it is 75 ° C. for silver plating, 65 ° C. for tin plating, and the like. As a plating method, when the plating solution is infiltrated after the polymerization of the copper strip 1 and plating is performed, the plating solution remains between the polymerized copper strips 1 and causes rust. Therefore, plating is performed before polymerization.

According to the fifth embodiment, there is no need to separately provide the current-carrying part copper plate piece 2, so that there is an effect that the material to be used can be further reduced. Moreover, the allowable temperature rise value can be set high by performing the plating treatment.

In the present invention, within the scope of the invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

1 copper strip, 2 energizing part copper plate piece, 3 energizing surface, 4 flexible conductor, 5 welded part, 6 unplated surface, 7 plated surface, 10 vacuum valve, 10a fixed contact, 10b Movable contact, 10c fixed conductor, 10d movable conductor, 11 fixed contact side main circuit conductor, 12 movable contact side main circuit conductor, 13 insulating rod, 100 vacuum circuit breaker.

Claims

In the flexible conductor formed by overlapping a plurality of flat copper materials extending in a predetermined direction and joining the flat copper materials to each other at the end portions of the flat copper material, the flat copper material A copper plate piece plated on the same member, and the copper plate piece is bonded to the outer surface of the connection portion and provided only at a location corresponding to the current-carrying surface of the connection portion. Flexible conductor.
2. The flexible conductor according to claim 1, wherein the copper plate portion is plated on only one side.
The shape of the copper plate piece is changed in accordance with the shape of the current-carrying surface of the connecting portion of the flexible conductor, and is made the same as the shape of the current-carrying surface. Flexible conductor.
2. The shape of the copper plate piece is selected from a plurality of polygonal or semicircular shapes according to the shape of the current-carrying surface of the connecting portion of the flexible conductor. Item 3. The flexible conductor according to Item 2.
The shape of the copper plate piece is a combination of a plurality of polygonal or semicircular shapes depending on the shape of the current-carrying surface of the connecting portion of the flexible conductor. The flexible conductor according to claim 2.
In the flexible conductor formed by overlapping a plurality of flat copper materials extending in a predetermined direction and joining the flat copper materials to each other at an end of the flat copper material, A flexible conductor, wherein only one portion corresponding to the current-carrying surface of the connecting portion in one outermost surface of a flat copper material is plated.
A vacuum valve having a fixed contact and a movable contact in a vacuum vessel, an insulating rod for moving the movable contact up and down, and a flexible one end connected to the movable contact side and the other end connected to the main circuit conductor A vacuum circuit breaker using a flexible conductor that opens and closes the fixed contact and the movable contact by the vertical movement of the insulating rod, wherein the flexible conductor is a plurality of flattened members extending in a predetermined direction. It is formed by overlapping copper materials, the flat copper materials are joined to each other at the ends of the flat copper materials, and the connecting portion is connected to the movable contact side and the main circuit conductor, and the flat copper material A copper plate piece plated on the same member is joined to the outer surface of the connection portion, and the copper plate piece is provided only at a location corresponding to the current-carrying surface of the connection portion. Vacuum circuit breaker using a conductor.