Cover arrangement for electrolytic capacitors

DETAILED DESCRIPTION The combinations of the features recited by the Patent claims 1 and 3 are provided in order to achieve the objects of the invention.
Advantageous refinements and developments of the invention are further recited in the dependent claims.
In particular, the solution according to the invention is based on the idea that a pressure-tight can closure can be formed by means of a cover part with a hard-paper core having suitable attachments or fittings or by means of an elastomeric cover part which closure complies with the stringent requirements relating to mechanical and chemical resistance, rotation protection of the connecting elements and placement of a valve element.
In order to achieve this, a first embodiment of the invention comprises a cover part that has a hard-paper core which is coated externally with respect to the can with an elastomerically flexible sealing layer and internally with respect to the can with a chemically resistant material layer wherein an elastomeric molding is arranged internally with respect to the can and is provided with at least one aperture which is aligned with an aperture in the cover part.
A connecting element and/or a valve element fit through the aligned apertures corresponding thereto and have an external circumferential collar and internal circumferential collar wherein the collars press the sealing layer and the molding therebetween in an axially force-fitting manner such that the aperture is sealed in a gas-tight manner.
According to a preferred feature of the embodiment, the cover part and the molding rest flat against one another and each have a plurality of apertures which are aligned with one another for receiving the connection elements and/or valve elements.
A second embodiment of the invention provides that the cover part is composed of an elastomeric material and that the connecting element and/or the valve element have external circumferential and internal circumferential collars which press outer and inner surfaces of the elastically flexible cover therebetween in an axially force-fitting manner