Active solid-state devices (e.g. – transistors – solid-state diode – Housing or package – Multiple housings
Patent
1995-01-12
1996-09-24
Crane, Sara W.
Active solid-state devices (e.g., transistors, solid-state diode
Housing or package
Multiple housings
257688, 257689, 257730, 257727, 257726, H01L 2302, H01L 2348, H01L 2334, H01L 2304
Patent
active
055593712
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an arrangement for a preassembled structure of disc cell semiconductors that can be pressure-contacted, and including a plurality of insulating pipes each being provided at one end with a flange. The insulating pipes loosely fix the stacked module together. The insulating pipes receive studs for pressure fixation of the stacked module together. A common holding plate at a first end of said stacked module receives the insulating pipes. The holding plate has a lower side in engagement with the flanges of the insulating pipes. A common insulator is provided at a second end of the stacked module. The insulating pipes are guided through the common insulator. A tightening strap causes a frictional lockup connection between the stacked module and the insulating pipes to axially secure the stacked module. Thus, the arrangement is for loosely securing a stacked module of disc cell semiconductors.
Preassembled modules that need only be positioned, screwed in place and connected at the point of installation without any particular assembly problems can be formed from such arrangements.
A voltage cell structure that has been used for years in rail operations comprises column-like disc cell semiconductors stacked loosely between end plates, associated terminal tags, and end-side cooling cells and insulating cells that are first secured in a stable manner by two or three studs and receive the necessary pressure contacting via a common compression spring plate during final assembly. The specific looseness of the preassembled structure requires axial securing to prevent the individual parts from falling apart, which is achieved by means of a tightening strap that extends through lateral holes of an end-side insulator. The studs, and more precisely their covering insulating pipes, are thereby enclosed. The module is prevented from falling apart by frictional lockup.
It has been seen that this loose fixation is inadequate for many built-in or disassembled items. Particularly in heavy, preassembled voltage cell structures, the frictional lockup of the axial securing can be overcome by the components' own weight. The result is that the module either falls apart into its individual components, or becomes so loose that the conventional centering pins between the components slip out of their counter-centering bores, which cannot be easily seen from the outside. During final assembly, improperly seated centering pins cause the destruction of the contiguous disc cell semiconductor. The effect cannot even be eliminated through strong prestress of the tightening strap.
SUMMARY OF THE INVENTION
The object of the invention, finally, is to prevent the structure from falling apart with the consequence of requiring readjustment work, and possibly even destruction of the semiconductors if care is not used during final assembly. The special object lies in an improved fixation.
This is accomplished by providing a holding plate and a common insulator that are axially and movably guided via the insulating pipes. The holding plate is supported on the flanges of the insulating pipes via a plurality of spring elements. A frictional lockup element is associated with the common insulator to permit limited movement in the axial direction.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in detail below with reference to schematic embodiments.
Shown are in:
FIG. 1 view of a voltage cell structure of the invention in halved section;
FIG. 2 top view of FIG. 1 along section line II--II;
FIG. 3 a schematic, enlarged view of detail III from FIG. 1 (sectional view);
FIG. 4 side view of a known clamping device for one-sided cooling;
FIG. 5 top view of the clamping device of FIG. 4.
DETAILED DESCRIPTION OF THE INVENTION
The known voltage cell structure used as the point of departure is illustrated in FIGS. 4 and 5. A stacked columnar structure is visible that comprises a centering plate 1 having on the one side (here at the very top) a contiguous, triangular insulator 2 for one-sided
REFERENCES:
patent: 3654528 (1972-04-01), Barkan
Feldhusen Joerg
Von Der Heydt Bernd
AEG Schienenfahrzeuge GmbH
Clark Jhihan
Crane Sara W.
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