JPS59108285A - Bus duct connecting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a bus duct connection device.

In general, a bus duct connection device includes a housing 1.as shown in FIGS. 1 and 2. ] The tip ends of plate-shaped conductors 2 housed in A were brought into contact with each other and fixed with connecting bolts 3.

However, when using this method, the contact surface of the conductor 2 needed to be subjected to electrical contact surface treatment such as silver plating in order to maintain electrically stable contact over a long period of time.

In addition, due to the heat cycle caused by energization, the dimensions of the tightening part change due to the difference in the thermal expansion coefficients of the conductor 2 and the connecting bolt 3. If 1C (1 and contact pressure) J decreases, the contact resistance will increase, and if the discharge continues as it is, the increased contact resistance will generate heat, and in the worst case scenario, the unit will burst into flames. There was a danger of it happening.

In order to prevent this, it was necessary to carry out retightening inspections on a regular basis. This inspection required a large amount of time and man-hours, and had the disadvantage that a power outage was required while the bus duct line was being inspected.

The purpose of the present invention is to eliminate the two drawbacks mentioned above, and to prevent the electrical contact between the two conductors G from becoming poor or mechanically loosening, thereby significantly reducing the number of maintenance and connection work compared to the conventional method. The object of the present invention is to provide a bus duct connection device that can reduce the number of connections.

In the present invention, the front end surfaces of the side conductors that are connected to each other are made to face each other, and the front end of the image is fitted into a U-shaped connection piece, and the U-shaped opening edge of the connection piece and each conductor are fixed by welding. That's what happens.

Hereinafter, an embodiment of the bus duct connecting device of the present invention will be explained with reference to FIGS. 3 to 5, with the circuit portions having the same reference numerals as those of the conventional device.

A conductor 2 made of copper or aluminum has its tip end faces facing each other, and its tip end is fitted into a U-shaped connecting piece 5 made of the same material as the conductor 2.
The opening edge of the connecting piece 5 and the conductor 2 are welded in the longitudinal direction by a welding part 5, and a gap G is provided at the abutting part on the tip end surface of the conductor 2, as shown in FIG. You can also do this.

In addition, bus tacts are often installed in relatively narrow areas for the purpose of making effective use of buildings.

For this reason, welding work can often only be performed from the top or bottom surface, and therefore, the weld build-up position is often limited to one direction of the conductor 2.

As a result, when welding only the upper part of the conductor 2 as shown in Figs. 6 and 7 (even if the current carrying capacity is sufficient, the deformation as shown by the dashed line in Fig. 6) may occur. , or as shown in FIG. 8, it may deform from the state shown in FIG. This makes it possible to prevent the above deformation.

Alternatively, the welding connection between the connecting piece 3 and the two conductors 2 may be made by connecting one side of the opposing conductor 2 and the connecting piece 3 at the factory, and then welding the opposite side at the installation site. good.

In this way, the bus dug 1 to the connection device of this embodiment abuts the end faces of the conductor and fits into the U-shaped connection heath, and connects the opening edge of the connection piece and the conductor in the longitudinal direction by welding, so that mechanically strong transmission can be achieved. The capacitance is large and the electrical connection is sufficient, eliminating the need for the conventional work of removing waste and treating the electrically connected surfaces.

Therefore, the number of work hours for connection and maintenance can be reduced, and power outages due to waste cotton can be eliminated. In the case of connection from port 1, there is no need to provide a large space between the minnow parts, so the mutual distance can be reduced accordingly, and the connection part can be formed compactly. In addition, it is possible to provide a gap G between the conductors whose end faces face each other, absorb errors during installation, and sufficiently deal with minor changes in route length due to changes in tiers, etc. There is an advantage that it can also be done.

As described above, the bus duct connection device of the present invention prevents the connection between the two conductors from becoming electrically unstable or mechanically loosening, and the number of work hours for connection and maintenance can be significantly reduced compared to conventional methods. This is part one of determining the effect that can be achieved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the housing part of a conventional bus duct.
2 is a plan view of the connecting portion of the bus duct shown in FIG. 1, FIG. 3 is a plan view showing an embodiment of the bus duct connecting device of the present invention, and FIG. 4 is a connecting portion of the set of conductors shown in FIG. 3. 5 is an enlarged cross-sectional view taken along the V-V arrow in FIG. 4, and FIGS. 6, 7, and 8 are U
Figure 6 shows the deformation in the case of welding without attaching the letter-shaped connecting piece, and Figure 6 is an explanatory diagram of deformation from the solid line as shown by the dashed-dotted line, and Figure 8 is an explanatory diagram of deformation due to welding as shown in Figure 7. . 1.1A: housing, 2: conductor, 4: connection piece.

Claims (1)

[Claims] In the connection of the bus duct 1~ that connects the ends of the plate-shaped conductors stored in the housing, the end surfaces of the side conductors are faced to each other, and the front end of the image is inserted into a U-shaped connection piece. The bus dug 1~connection device is characterized in that the U-shaped frontage edge of the connection piece and the side conductor are fixed by welding.