DE2146061A1 - CONDUCTING EXPANSION PIECE - Google Patents

Description

Current-conducting expansion piece The invention relates to a conductive expansion piece for aluminum pipes.

To compensate for the linear expansion of busbars when heated expansion bands made of foils are known, which are screwed between two busbars or welded. In the case of high-current rails, several of these expansion bands are usually required can be used in parallel in order to obtain the required current-carrying capacity. These expansion bands require a lot of space, especially with insulated rails with small center distances is often not available.

There are still compensating pieces with sliding, resilient contacts of various designs known. Such compensating pieces can be found at Conductors made of aluminum because of the poor contact properties of this material do not use immediately. In this case it would have to be B.

Cupal material is welded to the aluminum rails, What may not be possible due to a lack of facilities during assembly. One Another option would be to electroplate the ends of the aluminum rails with a precious metal to cover; this is difficult with long busbars.

The task is therefore to create an electrically conductive expansion piece for aluminum pipes with good contact properties and little space requirements. It is achieved according to the invention in that in each end of each other to be connected aluminum tubes a cylindrical Eupfer socket with contact lamellar strips is in a press fit, and that a cylindrical copper contact bridge with Eontaktlamellenbänder is mounted in a sliding fit inside the copper bushing.

The invention is explained in more detail below with reference to a drawing.

In the case of the solution according to the invention, a contact area is first made Copper is produced, which may or may not be galvanically silvered or with another Precious metal is plated.

The contact surface consists of a copper socket 4, which is commercially available Contact lamella belts 2 driven into one end of the aluminum tubes 1 in a press fit will. The webs of the bronze contact lamellar strips are twisted and produce thus the required contact pressure between the outer cylinder of the copper socket 4 and the inner cylinder of the aluminum pipe 1. In particular, the one used Press fit the bars dig into the soft aluminum.

The contact surface for the sliding contact is now the inner cylinder the copper socket. With the help of a cylindrical contact bridge 5 made of copper and Contact lamellar belts 3 in a sliding fit are now two ends of aluminum tubes connected with each other. There is so much space between the ends of the aluminum tubes left as the maximum linear expansion requires. Because of the use of Despite the smaller diameter, copper for the contact bridge is approximately the same same current carrying capacity achieved as with aluminum tubes.

Because all parts of this expansion piece are inside the aluminum tube additional space is not required, neither in the longitudinal direction nor on the circumference. Any rail insulation that may be present can be fitted with a sleeve in a known manner get connected.

3 pages description 2 patent claims 1 sheet of drawings with 1 Fig.

Claims (2)

Patent claims: 1., Conductive expansion piece for aluminum pipes, characterized in, that in each end of the aluminum tubes to be connected there is a cylindrical Copper socket with lamellar strips in a press fit, and that a cylindrical Copper contact bridge with lamellar strips inside the Xupfer socket in a sliding fit is stored. 2. Conductive expansion piece according to claim 1, characterized in that that, if necessary, the copper socket is coated with a noble metal.