JPS5841656Y2 - Hermetic terminal with terminal board - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an airtight terminal having a terminal plate used as a cap for a relatively large power rectifier or the like.

As this type of airtight terminal, there is a structure shown in FIGS. 1 and 2.

In the figure, 1 is a metal outer ring, and there is a glass 2 inside it.
The pipe lead 3 is hermetically and insulatively sealed via the pipe lead 3.

This pipe lead 3 is made by brazing a right cylindrical metal member 5 to a metal inner ring 4 that is hermetically sealed to the glass 2, and fitting a round bar-shaped base 6a of a terminal plate 6 into the right cylindrical metal member 5. It is soldered together.

However, with such a configuration, there is a problem that the effective length of the right cylindrical metal member 5 that can be caulked is reduced by the length of the base 6a of the terminal plate 6 fitted to the right cylindrical metal member 5. There is a point.

FIG. 3 is a cross-sectional view of another example of an airtight terminal having a terminal plate.
Pinch the upper end of the long right cylindrical metal member 7 to connect the terminal plate 8.
It has a pipe lead 3a integrally formed with the pipe lead 3a.

This type of structure has the advantage that it is cheaper than the one shown in FIG. 2 because the terminal board is not a separate part, but the thickness of the terminal board 8 is the same as the thickness of the right cylindrical metal member 7. It has the disadvantage that it can only be doubled.

FIG. 4 is a sectional view of still another example of an airtight terminal having a terminal plate, showing the bottom part 9 of a bottomed cylindrical metal member 9 with a closed top end.
It has a pipe lead 3b on which a terminal plate 10 is brazed.

In such a configuration, the bottom 9 of the cylindrical metal member 9
Although a high airtightness can be obtained by using a, the cylindrical metal member 9 is expensive, and the effective length of the cylindrical metal member 9 is reduced by the thickness of the bottom portion 9a.

This idea was proposed in consideration of these points,
The pipe lead is formed by brazing a terminal plate member thicker than the inner diameter of the cylindrical metal member to the upper end of the cylindrical metal member.

Hereinafter, one embodiment of this invention will be described with reference to the drawings. In FIG. 5, reference numeral 11 denotes a metal outer ring made of iron, and a pipe lead 13 is inserted into the upper interior of the ring through a sealing glass 12 such as soda barium glass or soda lime glass. is sealed in an airtight and insulating manner.

This pipe lead 13 is made by brazing a right cylindrical metal member 15 made of copper or the like to a metal inner ring 14 made of an iron-nickel alloy to which a sealing glass 12 is hermetically sealed. The upper end of the metal member 15 has a wall thickness t equal to or greater than the inner diameter of the right cylindrical metal member 15 .

That is, it is formed by brazing the terminal plate members 16 having a relationship of t≧D.

According to such a configuration, since the right cylindrical metal member 15 is used, the cost is not only reduced, but also the right cylindrical metal member 1
5 can be made into an effective length, and the work of inserting the conductive wire from the semiconductor element into the inside of the right cylindrical metal member 15 and caulking and fixing it from the outside can be easily performed.

Furthermore, if the effective length is the same as the conventional one, the entire length of the pipe lead 3 can be made shorter than the conventional one.

Although the above embodiment describes a compression-sealed airtight terminal, it is also possible to use a matching method in which the metal outer ring 11 and the metal inner ring 14 are made of an iron-nickel-cobalt alloy, and the sealing glass 12 is made of borosilicate glass. It can also be applied to sealed hermetic terminals.

FIG. 6 is a sectional view of a hermetic terminal according to another embodiment of this invention.

In this embodiment, a long right cylindrical metal member 17 is formed of an iron-nickel alloy, and its lower end is directly sealed with the sealing glass 12, thereby creating a pipe lead 13a without the metal inner ring 14. It is something to be prepared for.

Even in such a configuration, the same effects as in the embodiment described above can be obtained.

Alternatively, the metal outer ring 11 and the right cylindrical member 17 may be made of an iron-nickel-cobalt alloy, and the sealing glass 12 may be made of borosilicate glass to form a matched sealed hermetic terminal.

Furthermore, although the above embodiment has been described with respect to an airtight terminal for a rectifier, the invention can also be applied to an airtight terminal for a thyristor having a pipe lead for a small-diameter gate terminal in addition to the pipe leads 13, 13a.

As described above, in this invention, the pipe lead is formed by brazing a terminal plate member thicker than the inner diameter of the cylindrical metal member to the upper end of the cylindrical metal member, so the effective length of the pipe lead is It is possible to provide an airtight terminal that is long and has a sufficiently thick terminal plate at a low cost.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional airtight terminal having a terminal plate as a rectifier cap, Fig. 2 is a sectional view taken along line II-II in Fig. 1, and Figs. 3 and 4 are conventional terminal plates. FIGS. 5 and 6 are cross-sectional views of other examples of airtight terminals having terminal plates according to different embodiments of this invention. 11... Metal outer ring, 12... Sealing glass, 13, 13 a... Pipe lead, 14.
...metal inner ring, 15.17...tubular metal member, 16...terminal plate member, D...inner diameter of tubular metal member, t. ...Thickness of the terminal board member.

Claims (1)

[Scope of utility model registration request] In an airtight terminal in which a pipe lead having a terminal plate is hermetically and insulated sealed inside a metal outer ring through glass, the pipe lead is attached to the upper end of a cylindrical metal member from the inside diameter of the cylindrical metal member. An airtight terminal having a terminal plate characterized in that it is formed by brazing thick terminal plate members.