JP2003324818A - Flexible lead - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate flow of a current to a section which is not functioning effectively as a current-carrying part, and to enhance work efficiency at assembling. <P>SOLUTION: In a flexible lead comprising a laminate 24, where thin band- shaped copper foils are stacked in layers and is arranged in loop form, with both its ends connected to a lead conductor where a variety of switches are fixed and with its substantially middle connected to a movable conductor 7, a conductive connector 26 is shaped, in cross section, like a U-shape which consists of opposition pieces 27 and a coupling piece 28, having coupled the ends on one side each of both those opposition pieces 27 with each other; the end face on the other sides of both opposition pieces 27 is open 29; and a connection to be connected to both conductors 19 and 7 of the laminate 24 is inserted between both opposition pieces 27 from the opening 29; and the connector 26 bypasses both the outermost layer copper foils of the connection to each other. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible lead made of a laminate in which thin strips of copper foil are stacked in layers, and more specifically, to open and close a vacuum circuit breaker at both ends. The present invention relates to a flexible lead that is connected to a fixed lead conductor of equipment and has a substantially middle portion connected to a movable conductor and arranged in a loop. 2. Description of the Related Art A conventional example in which this type of flexible lead is applied to a vacuum circuit breaker will be described with reference to FIGS. 1 is a circuit breaker of a switchgear storage type, 2 is a frame made of an insulating material erected on a base 3 of the circuit breaker 1, 4 is a three-phase vacuum valve supported on the frame 2, 5 is a vacuum valve 4 , 6 is a movable contact that comes into contact with and separates from the fixed contact 5, 7 is a movable conductor connected to the movable contact 6, and 8 is an umbrella-shaped insulator made of an insulator connected to the lower end of the movable conductor 7. Is a concatenation of Reference numeral 9 denotes an operation lever rotatably provided on the gantry 3, one end of which is connected to an operation device and moves up and down.
Reference numeral 10 denotes an operation body connected to the other end of the operation lever 9;
Is a receiving plate of the operating body 10, the shaft portion 12 of the connecting body 8 is inserted into a through hole of the receiving plate 11, and a nut 13 is fixed to a lower end of the shaft portion 12. Reference numeral 14 denotes a spring provided between the connecting body 8 and the receiving plate 11, and as shown in the figure, when the operating body 10 is located below, the movable contact 6 separates from the fixed contact 5 and the operating body In a state where 10 is positioned above, the movable contact 6 is joined to the fixed contact 5 and pressed by the spring 14. Reference numeral 15 denotes a fixed conductor connected to the fixed contact 5, and 16 denotes an upper main circuit contact at the tip of the fixed conductor 15, which contacts a main circuit contact 17 in the switchgear. [0005] Reference numeral 18 denotes a support fixed to the inside of the frame 2, which is located horizontally in the left opening of the frame 2, and has bolt holes formed vertically. Reference numeral 19 denotes a lead conductor positioned below and parallel to the fixed conductor 15, and 20 denotes a lead conductor 19.
The lower surface is joined to the support 18, a bolt from below the support 18 is screwed into a tap hole of the mount 20, and the lead conductor 19 is connected to the support 18 via the support 18. It is fixed to the frame 2. Reference numeral 21 denotes a lower main circuit contact at the leading end of the lead conductor 19, which is in contact with a main circuit contact 22 in the switchgear. Reference numeral 23 denotes a flexible lead made of a laminated body 24 in which thin strip-shaped copper foils are stacked in layers. The copper foils at both ends are adhered to each other by soldering, rivets, etc. 7, the flexible leads 23 are bolted to the upper and lower surfaces of the lead-out conductor 19, and the flexible leads 23 are arranged in a loop. Since the flexible lead 23 has flexibility, the fixed lead conductor 19 and the movable conductor 7 moving up and down can be connected by the bending deformation, and the flexible lead 23 is connected between the two conductors 19 and 7. When the large current flows at the time of a short circuit or the like, the electromagnetic force generated in the flexible lead 23 is canceled in the vertical direction, and the swing of the lead conductor 19 is prevented. In the conventional flexible lead 23, since an oxide film is easily formed on the surface of the laminated copper foil, the contact resistance between the copper foils increases, and the movable conductor 7 or the lead Current does not easily flow through the copper foil at a position distant from the contact surface with the conductor 19, and thus does not function effectively as a conducting part. Therefore, even if the cross section of the flexible lead is enlarged, the current that actually flows is concentrated on the contact surfaces of the conductors 7 and 19, and there is a problem that heat generation increases and the temperature rises. It is also conceivable that a flexible lead is inserted through a tubular body having a rectangular cross section, the tubular body is positioned at an intermediate portion of the flexible lead, and bolts are inserted through the tubular body and the flexible lead to connect to the movable conductor. However, it is difficult to insert a flexible lead through the cylinder, and the cylinder has to be moved to the middle part of the lead. An object of the present invention is to provide a flexible lead which facilitates current flow even in a portion not effectively functioning as a current-carrying portion and improves workability in assembling, taking the above points into consideration. And In order to achieve the above object, the present invention is directed to a drawer conductor comprising a laminated body in which thin strip-shaped copper foils are stacked in layers, and both ends of which are fixed to switches and the like. In the flexible lead arranged in a loop, the middle part is connected to the movable conductor, and the conductive connection body includes an opposing piece and a connecting piece connecting one end of the opposing pieces, The connecting portion connected to the two conductors of the laminate is inserted between the opposing pieces from the opening, the connecting portion being formed in a U-shaped cross section with an opening between the other ends of the opposing pieces opened. Thus, the space between the outermost copper foils on both sides of the connection portion is bypassed. In the flexible lead according to the present invention having the above-described structure, the conductive connecting member includes an opposing piece and a connecting piece connecting one end of each of the opposing pieces. Is formed in a U-shaped cross section with an opening, and a connecting portion connected to the lead conductor and the movable conductor of the copper foil laminate is inserted between both opposing pieces from the opening of the connecting member, and both ends of the connecting portion are connected by the connecting member. Since the space between the outer copper foils is bypassed, current flows not only in the copper foil near the contact surface that is in direct contact with the conductor, but also in the copper foil on the opposite side of the contact surface, effectively functioning as a conducting part. , The energizing area can be increased, the temperature rise can be reduced, and each connecting portion of the laminate can be easily inserted into the opening on the opposite side of the connecting member having a U-shaped cross section. Sex is greatly improved. An embodiment of the present invention will be described with reference to FIG. The flexible lead 25 is composed of a laminated body 24 in which thin strip-shaped copper foils are stacked in layers, and conductive connectors 26 having a U-shaped cross section are provided at both ends and substantially at both sides of an intermediate portion. The conductive connecting body 26 is formed of an opposing piece 27 and a connecting piece 28 connecting one end of each of the opposing pieces 27.
An opening 29 is formed between the other end of the opposing piece 27. Each connecting member 26 is connected to an opposing piece 27 through an opening 29.
The laminate 24 is inserted therebetween, and the connection body 26 bypasses between both outermost copper foils of the laminate 24. The laminates 24 at both ends and almost the middle of the flexible lead 25 and the respective connecting bodies 26 are fastened and fixed with rivets 30, and the bolts 3 are formed in the opposing pieces 27 and the laminate 24.
1 are formed in communication. Since the connecting body 26 has a U-shaped cross section, the connecting body 26 can be very easily inserted into the laminated body 24 from the opening 29 at the side end of each of the opposing pieces 27. Accordingly, workability at the time of assembling the flexible lead 25 is improved. Next, the flexible lead 25 is
A case where the present invention is applied to a vacuum circuit breaker will be described with reference to FIGS. In these figures, the same reference numerals as those in FIGS. 4 and 5 indicate the same or corresponding elements,
The only difference is the flexible lead 25. As described above, the flexible lead 25 is provided with the conductive connecting members 26 on both ends connected to the lead conductor 19 and on both sides of the connection portion substantially at the intermediate portion connected to the movable conductor 7. The connecting body 26 at the substantially middle portion is provided to face the side surface of the movable conductor 7 by bolting via a flat washer and a spring washer, and both ends are connected to the upper and lower surfaces of the lead-out conductor 19 by a flat washer and a spring. The flexible leads 25 are connected by bolts via washers, and the flexible leads 25 are arranged in a loop. Since the connection body 26 bypasses between the outermost copper foils on both sides of the connection portion, current flows not only into the copper foil on the conductors 7 and 19 but also on the copper foil on the opposite side, and is effective as a current-carrying portion. To work. In the above-described embodiment of the flexible lead 25, the conductive connecting members 26 are provided on both sides of the connecting portion of the laminated body 24. May be provided. Since the present invention is configured as described above, it has the following effects. The conductive connector 26 is formed of an opposing piece 27 and a connecting piece 28 connecting one end of each of the opposing pieces 27, and is formed in a U-shaped cross section with an opening 29 between the other ends of the opposing pieces 27, A connection portion connected to the lead conductor 19 and the movable conductor 7 of the copper foil laminate 24 is inserted between the two opposing pieces 27 from the opening 29 of the connection body 26, and the connection body 26 connects the two outermost copper foils of the connection portion. Is bypassed, so that current flows not only into the copper foil near the contact surface in direct contact with the conductors 19 and 7 but also into the copper foil on the side opposite to the contact surface, effectively functioning as a conducting part. The energizing area can be increased, the temperature rise can be reduced, and each connecting portion of the laminated body 24 can be easily inserted into the opening 29 of the facing piece 27 of the connecting body 26 having a U-shaped cross section. Workability at the time can be remarkably improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, wherein A is a front view, and B is
Is a plan view, and C is a left side view. FIG. 2 is a front view when the flexible lead of FIG. 1 is applied to a vacuum circuit breaker. FIG. 3 is a plan view cut along the line SS in FIG. 2; FIG. 4 is a front view when the conventional example is applied to a vacuum circuit breaker. FIG. 5 is a plan view cut along the line SS of FIG. 4; [Description of Reference Code] 7 Movable conductor 19 Leader conductor 24 Laminated body 25 Flexible lead 26 Conductive connector 27 Opposing piece 28 Connecting piece 29 Opening

Claims (1)

Claims: 1. A laminate comprising thin strips of copper foil stacked in layers, both ends of which are connected to a lead conductor to which switches are fixed, and a substantially intermediate portion is connected to a movable conductor. A flexible lead arranged in a loop, wherein the conductive connecting body is formed of an opposing piece and a connecting piece connecting one end of the opposing pieces, and a cross section is opened between the other ends of the opposing pieces. A connection part formed in a U-shape and connected to the two conductors of the laminate is inserted between the two opposing pieces from the opening, and the connection body bypasses between both outermost copper foils of the connection part. Flexible lead characterized by doing.