DE1490111C - Power feedthrough in which a power feedthrough conductor is melted into a tubular metal part formed from a metal plate by means of a glass bead - Google Patents

Description

Graphite cylinder at the same time to center the conductor 2. These conductors are at their lower ends taken in a holder, but the spherical shape of the pearl solely by gravity is achieved at a precisely determined heating temperature of the glass.

The metal part 1 is formed from a sheet of Fernico metal with a thickness of 1.5 mm so that tubular parts 1 are formed by deep drawing and punching, in each of which a preformed body 7 consisting of pressed and sintered powder of crystallizing glass is inserted will. The required number of conductors 2 with a diameter of 2.3 mm each is inserted into a holder, whereupon the metal part with the bodies 7 made of crystallizing glass is placed over the conductors. The disks 8 made of pressed and sintered powder of a non-crystallizing glass are then pushed over the conductors so that they come to rest on the body 7. Then a graphite cylinder is pushed over the ladder, which presses on the disks 8, whereupon the whole thing in an oven to 97O ⁰ C in such a way

is heated so that the body 7 softens and forms a spherical end 6, and the glass 8 a forms a well-adhering layer over the wide end of the glass part 7, so that the glass bead 5 consists of two Types of glass.

The glass of the body 7 can have the following composition:

3.5 percent by weight K ₂ O, 3 percent by weight Al ₂ O ₃ , 81.5 percent by weight SiO ₂ , 12 percent by weight Li ₂ O.

The glass of the disc 8 can consist of:

69.4 percent by weight SiO ₂ , 8.1 percent by weight Na ₂ O, 6.7 percent by weight K ₂ O, 5.4 percent by weight Al ₂ O ₃ , 0.1 percent by weight Fe ₂ O ₃ ,

10.3 weight percent BaO.

The adhesion of the latter glass can be improved by adding a small amount of cobalt oxide will.

1 sheet of drawings

Claims (3)

According to the pearl of two different types of glass. '.'; ■ '' V; The tubular metal part is covered with a glass 1. Current feedthrough filled with a type of metal that flows less easily, e.g. B. consists of a plate, with one or more current 5 the addition of ceramic powder, but preferably lead-through conductor by means of glass beads in a slightly crystallizing type of glass is used. Metal plate-shaped tubular metal parts This part of the bead is fused in a spherical shape at the narrow end and the bead is shaped at the narrow end without the glass being spherical over the metal edge of the tubular metal part, characterized by the fact that each Pearl (5) OK while at the other end there is good adhesion with two types of glass (7,8). '.' ■: - _? the conductor 'is achieved because the pearl on this 2. Current feedthrough according to claim 1, instead of a non-crystallizing glass layer characterized in that the one at the narrow end is at the temperature at which the crystal-spherical Part (6) of the bead (5) from a sizing glass just has a well-spherical end crystallizing type of glass (7) and the wide 15 forms, flows well and adheres to the conductor. End of the pearl (5) from a layer of not The invention is based on a drawing crystallizing glass (8). ^: explained in more detail. It shows 3. Current feedthrough according to claim 1 or 2, F i g. 1 a known embodiment of a characterized in that the spherical implementation, End (6) of the pearl (5) within the edge of the 20 F i g. 2 such an implementation with a partial tubular metal part (1) lies. . wise melted pearl, F i g. 3 an implementation according to the invention, before the glass is melted and F i g. 4 shows an implementation according to the invention 35 after melting the glass bead. In Fig. 1, the pearl 3 is well melted, so that at the wide end of the tubular part a The invention relates to a current through-good fusion with the metal parts 1 achieved guide, which consists of a metal plate, where is. At the narrow end there is a spherical part 4 one or more current feedthrough conductors stood by means of 30, but the glass over the edge of the Glass beads run away in tubular metal part 1 formed from the metal plate. It shaped metal parts are melted and the result is that, because the expansion coefficient Pearl at the narrow end of the tubular part of spherical glass and metal for the purpose of achieving a is shaped. Such power feedthroughs are z. B ..: Pressure meltdowns are chosen differently, jumps known from British patent specification 769 219. 35 occur in the spherical part 4 of the pearl 3, since the With such power feedthroughs, the metal edge of the end of the tubular part must be it must be ensured that the surface of the glass bead is within the glass. has a sufficiently long creepage distance. To the glass bead 5 according to F i g. 2 heated in such a way that To be able to keep the dimensions small is that a spherical ,, part 6 is created, in which the Pearl therefore at the narrow end of the tubular metal 40 glass not over the edge of the tubular part 1 part _;> designed spherical. The diameter of the.. Runs away, so there is none at the wide end tubular part can on the side of its over- good adhesion with the conductor 2 and the metal of the gangs in the metal plate will be larger, so that the part. Although in this case the glass of the spherical Pearl there can be flat ..;,. _: . . ., -, shaped part6 of the pearl5 does not jump, the Since the current leadthroughs of such lead-throughs will leak because the glass is not correct guides exposed to large mechanical forces with the conductor 2 is fused. are, the pearl is preferably made of a single In the embodiment of the invention according to umpteen, ... slightly crystallizing types of glass. the F i g. 3 and 4 is next to the preferably from '^; ^ · '= D'abeί ■ · ■ rritί ■ -abel ⁱ ' dfö ■ "SchW ^ e ^ ίgkät '■ äΉΪί ■■ ^% däß · ■ dίe ■ PeΓliB · ^; -' pressed and sintered powder of a crystallized with further melting through, the preformed body 7 existing at the narrow end 50 of the glass of the tubular metal part drops too far down a z. B. pressed and sintered glass powder and over the metal edge of this part, the existing perforated disc8 runs over .the conductor2 as a result of being pushed onto the glass by the metal edge, which together form the glass bead 5. Forces exerted jumps in glass, on: körinen ..:.? > That ^! easier flowing, not crystallizing ^ glass 8 When the pearl is less deeply melted 55 forms a well-adhering, closure of the wide is, the spherical part does not run over the end of the bead 5 at the temperature that is necessary the metal edge of the tubular part away, so is the bead 5 in FIG. 4 shown shape that cracking of the glass is avoided, but to give the glass of the spherical end 6 there is then no good adhesion of the bead over the edge of the tubular at the wide end of the glass on the conductor, whereby the passage 60 part 1 runs away. So here is the danger leadership can leak. Jumping of the spherical part 6 of the pearl 5 The aim of the invention is the production of a avoided and nevertheless by means of the glass layer 8 Implementation, with great strength due to a well-adhering closure at the wide end of the bead 5 Application of a pearl made of crystallized glass and scored. To get the desired shape of the surface To get a good adhesion of the bead to the metal part 65 of the glass, a graphite cylinder is used is, but without the glass pushed over the metal edge over the conductor that the glass 8 as a result the narrow end runs away. its own weight. If the transit This object is achieved in that the inventive guide part contains a plurality of conductors 2, which is used