Gas separation – Two or more separators
Patent
1992-02-11
1992-11-03
Nozick, Bernard
Gas separation
Two or more separators
55498, 55502, B01D 4600
Patent
active
051605198
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a filter device for filtering a gaseous medium, comprising a filter housing with an inlet opening and an outlet opening for the medium, a filter element enclosed in the housing and disposed between said openings, and a pipe stub coupled to the outlet opening of the housing for coupling to a gas conduit, said pipe stub extending through the outlet opening and having a portion extending into the interior of the housing, which portion has a surface which can form a sealing surface against a seal on the filter element.
A common type of air filter for internal combustion engines has a cylindrical filter housing with the outlet opening at one end. The pipe stub for connecting the filter to an intake conduit is fixed to the housing end plate and the filter element, which typically has a tubular filter body, abuts with one end against the end surface surrounding the outlet with a seal therebetween, which is compressed when the filter body is pressed against the outlet end plate by the other end plate of the housing, which serves as a cover when in place.
These axially sealing filters have a major disadvantage. Due to the fact that the filter must be fitted between the housing end plates, special attention must be paid to the axial dimension of the filter element and the filter housing. Any deviations can result in leakage or damage to the filter element.
A known solution to this problem is to seal the filter element radially. The filter element is provided on its inner lateral surface at its outlet end with a radial sealing ring, which seals against the pipe end forming an extension of the outlet stub extending into the filter housing. Thus the only requirement as to axial fit is that the filter seal must enter the stub.
The requirement of a pipe end extending into the filter housing, against which the filter element seals, creates, however, production technical problems. For instance, an inwardly directed cylindrical surface cannot be produced by blow moulding of the housing. A solution to this problem, which is described in U.S. Pat. No. 4,720,292, for example, is to make the outlet stub separately from the filter housing and to fix it to the outlet end plate in such a manner that the end portion of the outlet stub extends into the filter housing.
The purpose of the present invention is, starting from the known solution mentioned above, to achieve a filter device of the type described by way of introduction which is simple to manufacture and assemble and which provides a good stress distribution between the outlet stub and the filter housing as well as providing an effective seal between the stub and an intake conduit coupled thereto.
This is achieved according to the invention by virtue of the fact that an elastic angular element is placed between the edge of the outlet opening and the outer surface of the pipe stub and extends axially out over the pipe stub to form a seal between the pipe stub and a gas conduit coupled thereto.
According to a preferred embodiment of the filter device according to the invention, the elastic angular element is provided on its exterior with a peripheral groove, into which there extends an edge portion of the housing surrounding the outlet opening.
This makes assembly quite simple. An elastic element, e.g. in the form of a rubber sleeve, is folded radially, is inserted into the outlet opening of the housing and is allowed to expand so that the edge portion slips into the groove. The outlet stub is then inserted into the sleeve which is thus fixed in its expanded state. Thus a single element serves as an elastic fixing means for the pipe stub, as a vibration absorbing means between the intake conduit and the filter housing and as a sealing device between the pipe and the intake conduit as well as compensating means for variations in the axial dimensions.
The invention will be described in more detail below with reference to examples shown in the accompanying drawings, of which
FIG. 1 shows a longitudinal section through the upper half of a filter de
REFERENCES:
patent: 3616618 (1971-11-01), Gronholz et al.
patent: 4720292 (1988-01-01), Engle et al.
Klippare Sten
Svensson Per
AB Volvo
Nozick Bernard
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