Process for potting components in an impregnating compound

Details Process for potting components in an impregnating compound Process for potting components in an impregnating compound

1994-12-09

1997-09-23

Utech, Benjamin

Coating processes

Electrical product produced

427294, 4273855, 118 501, 118642, B05D 512

Patent

active

056702035

DESCRIPTION:

BRIEF SUMMARY
FIELD

The invention relates to a process for potting components in an impregnating composition which does not set at room temperature but which at elevated temperature (e.g. 60.degree. to 80.degree. C.) sets in a short time (e.g., in less than 30 minutes).
The invention furthermore relates to an apparatus for the practice of the method, consisting of a holding tank for a potting composition, a feeder connected to the holding tank, which discharges within a preferably evacuated potting chamber above the component or components to be potted; a transport system carrying through the potting chamber the component or the components disposed, for example, on a pallet, while the potting chamber is a single chamber or comprises three treatment chambers formed by dividing walls, a forechamber or first chamber for entrance through an airlock, a main chamber for potting, and an output chamber for output through an airlock.


STATE OF THE ART

In a printed publication of Verfahrenstechnik Hubers GmbH, 4290 Bocholt, entitled "Vakuumgie.beta.harzanlagen," on page 9 a three-chamber automatic potting machine is described, in which, in addition to the main chamber in which the potting composition is cured in a vacuum by heat treatment, still another chamber is provided for the preliminary treatment and for admitting through an airlock the molds situated on a pallet, and an additional airlock chamber for the discharge and after-treatment of the potted components.
The individual chambers are connected together by vacuum-tight vertically sliding gates, so that the potting chamber located in the center does not have to be vented after the process has ended and then re-evacuated.
This time-saving procedure permits very large numbers of units to be potted all automatically through single and multiple potting spouts.
This shows clearly that the use of three-chamber vacuum ovens in itself pertains to the state of the art, even though details are not to be found in this publication.
It is the aim of the present invention to improve on this state of the art and especially to use it for modified methods of procedure.
In addition, mention is to be made of printed disclosures which likewise originate with the applicant and which deal with some aspects of the present invention. Thus, DE 38 03 419 A1 shows an apparatus for the metered dispensing of a plurality of portions of viscous substances, such as potting resin, in which potting apparatus are disposed also within a vacuum or subatmospheric pressure chamber above containers for receiving the portions of viscous substances. Nothing, however, is stated in this disclosure about the further treatment. In the disclosure additional disclosures are named as state of the art, but they tell nothing, either, about the further process after the dispensing and the potting of components.
A vacuum chamber used for potting is shown with special clarity in DE 30 19 509 A1 in which a precursor type of the potting apparatus represented in the prospectus referred to above is explained. Attention is called to these disclosures, therefore, in regard to details of the potting process, so that there is no need for any further explanation thereof in the following description.
It is common to all of the said disclosures that a two-component material is used, which is hardened by putting the two components in contact with one another. Lately, however, efforts have been made to develop potting compositions which are ready-mixed, so that the necessity of dispensing the individual components or ingredients of the mixture can be eliminated, resulting in considerable simplification.
The use of single-component material, however, has resulted not just in simplifications because of eliminating the arrangement of several holding tanks, and the setting up of apparatus for the precise metering and mixing of the materials; another advantage is that such a single-component material is less toxic, in contrast to the formerly used multi-component materials in which one of the components is comparatively very toxic before i

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patent: 5157820 (1992-10-01), Frederick

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