DE1984191U - CONNECTION OF AN ELECTRIC HIGH CURRENT CONTACT MADE FROM SINTER METAL. - Google Patents

Description

Daohau, 1.8 »July 1966 g / _r

G- e brau c Ii s in us tera η me 1 du η s '.

Bayerische Metallwerke A ₀ G ₉₃ 806 Dachauj Leitenweg 1

'Connection of a made of sintered metal, electrical heavy current contact *

Honor %

Ss is known j high- _{voltage contacts - especially contacts s} that work in oil load switches - to be made from tungsten and / or molybdenum with the addition of lower melting metals. The Kontaktgrundmetallj example, "as tungsten, are low-melting metals, such as copper silver _s, etc., are added, and the mixture is then pressed in molds under a high pressure required for molding and sintered.

Another "method is to produce a tungsten skeleton as the base metal, τ / whether a few percent of one or more lower melting metals are incorporated in powder form into the base metal. The pressing pressure depends on the desired porosity, which is kept in the pre-sintered base metal -Form piece that or the lower melting metal or metals are then segregated in a special operation under protective gas »It is also known that such contacts are so fully segregated * that an excess layer of a lower melting metal is created on the surface. This surface is machined and then connected to the contact carrier by means of a suitable hard solder. The hard solders used for this purpose have working temperatures of 60O ⁰ C to 1050 ⁰ G ₉

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with special deoxidizing special flux for soldering be taken · The tensile strength is "at appropriate . Solder "at about 35 kg / mm. -

For smaller contacts, this known type of soldering can be used as are designated without errors, provided that suitable Test methods are available that the pilot can use can be controlled

Larger contacts, which can be about 100 mm long and have a thickness of "up to 10 mm, have an unsafe soldered connection ₉ because after the soldering has cooled down, such large voltage differences arise between the contact pad and the contact carrier made of steel or a iron alloy, that the soldering can partially tear and the contact takes on a slightly curved shape »It does not matter whether the soldering is carried out in a protective gas furnace or with a gas burner or according to another known method Contact carrier to ₀ Every skilled person knows that a hundred percent soldering cannot be guaranteed despite the best solder and flux *

That a single contact has dropped off with a high-quality one Switching device can cause immeasurable damage. The invention aims to counteract the contact Secure waste and an almost tension-free / better one To create a soldered connection »

Pig, Fig. 1 shows a longitudinal section of the contact arrangement. fig. 2 a cross section and
■ Fig. 3 a top view.

Pig «, 4 the cross-section of a mutual contact fuse, Pig »5 the cross section of a contact with a dovetail« like fuse.

In! Ig. 1, the contact carrier is denoted by 1. The contact support 2 is connected to the contact carrier 1 in a known manner by brazing 3. To interrupt the stresses that occur, the contact support is provided with one or more expansion joints A ₅ aie divides the long contact into two or more contact blocks 10 ₉ 11 and 12, with the germinate peeping be so deep that only a relatively thin contact material layer 8 is present, which can be stretched in this state, so that the _s expansions or shrinkages, otherwise occurring at a large contact can be compensated.

The expansion joints 4 are in the contact pad 2 in front elaborated after soldering »To guide the contact surface the contact carrier 1 can be provided with lateral guide strips 9. Practice has shown that this results in the soldered Contacts have a straight and flat surface.

After soldering, each contact block 1O ₉ 11 and 12 is screwed to the contact carrier 1 with screws 5, the nut 7 being secured by a resilient washer or toothed washer 6. Be screwed thread of the support 1 and the G-ewindeende caulked or riveted in a known manner, so that with a possibly occurring risk of contact loosening the fixed screw completely, the solution and the falling e.ines contact excludes · ¹

Instead of ¥ screw connections, the fuses can take off. fixed rivet connections exist, which the contact pad 2 Secure on the contact carrier 1, as can the screw connections or rivets staggered. -3PaIIs "bores on the contact surface are undesirable, can the contact pad 13 according to Figo 4 on the two long sides the base with trapezoidal edges 14

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be formed, on which the side mowing strips 15 after the contact pad 13 has been soldered onto the carrier 16 to be flanged

Another fuse is shown in Fig. 5: The contact pad 2 receives on the soldering side 17 a dovetail »= 'shaped guide strip 18, which is in a longitudinal groove 20 of the Contact carrier 19 is guided and then the soldered connection is made «

Protection claims

Claims (4)

S _.._ q. h u t ζ a η s ρ r ü ρ h e ;; ■ 1. Connection of a sintered metal, electrical heavy current _contact} characterized in that the contact pad 2 is divided in length into two or more contact _{blocks 1O 5} 11, 12 and a coherent base plate 8 is present, which is on its entire surface by brazing 3 with the Contact carrier 1 is connected and the contact pad is additionally secured against loosening on the contact carrier by a mechanical connection. 2. Connection of an electrical high-voltage contact made of sintered metal according to claim 1, characterized in that the mechanical connection from screw ensembles 5> 6? 7 or from fixed het- » connections exist. 3ο connection of an atis sintered metal produced, electrical high- _{voltage contact according to claim 1 s,} characterized in that the contact pad 13 is formed on both longitudinal sides of the base with trapezoidal edges 14, on which both sides of the contact carrier 16 attached guide strips 15 are flanged. 4. Connection of a made of sintered metal, electrical heavy current contact according to claim 1, characterized characterized in that the contact pad 2 on its U-round surface 17 with a swallow tail-shaped Bar 18 is provided - the one on the contact carrier incorporated lut 20 is performed.