Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Polarity-responsive
Patent
1997-09-19
1999-01-26
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Polarity-responsive
335 80, 335 82, 335 86, 335128, 335129, 335132, 335202, 335278, H01H 5122
Patent
active
058642706
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an electromagnetic relay having an insulating wall which is arranged between the magnet system on one side and the contact arrangement on the other side with a plurality of insulating layers. In addition, the invention relates to a method for producing such a relay.
Specific minimum distances must be maintained by insulation for safe electrical isolation between those parts of a relay which are at mains voltage, on the one hand, and other parts which can be touched and the metal parts of the magnetic circuit. This minimum distance is controlled by appropriate standards and regulations. For example, the insulating distances can be implemented by simple insulation by means of an integral insulating wall, in which case this insulating wall must not have less than a specific minimum thickness. Another option is for the insulating wall to be formed from, for example, at least three individual layers, the wall thickness of these individual layers then no longer being specified. The dielectric strength of the individual layers must then be verified separately in each case. With the increasing requirement for miniaturization of electrical components in general and relays in particular, attempts are therefore being made to comply with the insulation requirements by the formation of multilayer insulating walls having individual layers which are as thin as possible.
For example, the Utility Model DE 9210790 U1 proposes that base insulation and additional insulation with appropriate dielectric strength values be formed by two cap parts which are interleaved in one another. However, the production and folding of these cap parts requires complex procedures and, in addition, does not provide optimum space utilization either.
A relay of the type mentioned initially has also already been described in Utility Model DE 8914910 U1. An insulating wall which comprises three insulating layers is implemented, inter alia, there in that two walls having an intermediate pocket are formed on a first insulating part, it being possible to plug the third wall, in the form of a film, into the pocket. Thus, in this case, the film must be produced, cut and inserted as an additional part. In order to ensure problem-free insertion of this film, the gap width in the pocket may not be chosen to be indefinitely small.
The object of the present invention is therefore to design a relay of the type mentioned initially such that an insulating wall having a plurality of layers can be designed to be as thin as possible and can be produced in a manner which is as simple as possible.
SUMMARY OF THE INVENTION
This is achieved according to the invention in that the insulating wall is formed from a wall base having at least one insulating gap which extends in a plane provided for an insulating layer, and in that the insulating layer is formed in the insulating gap by insulating material which is inserted in liquid form and is subsequently cured.
As a result of the design according to the invention, only a single molding is thus necessary which forms, for example, two insulating layers with the said gap, it also being possible for this wall base to be an integral part of a relay base body which, for example, is fitted with the magnet system and/or accommodates the contact elements. One or even more additional insulating layers are formed simply by inserting the liquid insulating material into the gap or into the gaps. Depending on the circumstances, this may not require an additional manufacturing step, since liquid potting compounds generally have to be inserted anyway, in order to seal the relay.
An additional insulating layer can, for example, also be produced by inserting the liquid insulating material into a base body gap, which is otherwise intended for accommodating a contact support. In this case, it is only necessary to ensure that the contact support is positioned in the gap on the side remote from the required insulating wall, such that the contact support does not adversely affect the formation of the multilayer insu
REFERENCES:
patent: 4761627 (1988-08-01), Bell
patent: 5204647 (1993-04-01), Nagamoto et al.
Donovan Lincoln
Nguyen Tuyen T.
Siemens Aktiengesellschaft
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