Gas separation – Specific media material – Ceramic or sintered
Reexamination Certificate
1998-10-30
2001-02-06
Simmons, David A. (Department: 1724)
Gas separation
Specific media material
Ceramic or sintered
C055S522000, C055S528000
Reexamination Certificate
active
06183530
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The subject matter of the invention is a filter unit for exchangeable insertion in the housing of a filter system, comprising the following features:
(a) the filter unit has a supporting component provided for supporting the filter unit in the housing and having a first side and an opposite, second side, the first side being provided facing the clean gas space of the housing for installation therein;
(b) a multiplicity of individual, hollow filter elements, each having an outer afflux surface for fluid to be filtered and an open surface portion for the outflow of filtered fluid from the interior of the filter element, is united with the supporting component in such a manner that the filter elements are located substantially in their entirety on the second side of the supporting component and provide good utilization of the space on the second side of the supporting component;
(c) the filter elements are inherently stable filter elements composed with porously sintered together particles;
(d) the unification of the filter elements and the supporting component is effected in common for the filter elements by a casting resin covering the filter elements on the outside with a height of at least 1 cm each and constricting the open surface portions of the filter elements at the most to a slight extent, the casting resin preferably constituting at the same time the supporting component of the filter unit.
2. Description of Related Art
Filter units for exchangeable insertion in the housing of filter systems are known in a variety of forms. In a frequently employed form, the filter element proper consists of a paper web or fibrous web folded in zigzag manner, which e.g. is brought into a total circular-annular configuration and which at both face ends thereof is received in the housing of the filter system in sealed manner.
In addition thereto, inherently stable filter elements are known which are composed with porously sintered together plastics particles and are substantially the shape of a hollow, flat, right parallelepiped open on one side (DE 42 11 529 A1). Such filter elements, in a multiplicity thereof, so far have not been united together by a casting resin so as to provide an exchangeable filter unit.
SUMMARY OF THE INVENTION
Inherently stable filter elements composed with porously sintered together particles can be produced in a considerable size—as compared with filter elements of other types. The invention provides a filter unit in which such filter elements, in a multiplicity thereof, are combined in advantageous manner in terms of manufacture so as to form an exchangeable filter unit. The common casting resin covers surface areas of the filter elements in such a manner that a filter unit united in stable manner results.
The casting resin preferably constitutes at the same time the supporting component of the filter unit. However, as an alternative it is possible that the supporting component additionally contains a force-receiving member, e.g. a metal plate, covered on one side or on both sides by the casting resin.
The filter unit preferably comprises at least four filter elements.
The supporting component, as seen in viewing direction towards its first side, preferably is of circular or rectangular, in particular square shape.
The filter elements each preferably have substantially the configuration of a hollow, flat, right parallelepiped open on one side, the two large faces of the right parallelepiped having preferably a corrugated or a zigzag path. The corrugated or zigzag path is preferably such that the “wave crests” and “apexes”, respectively, extend substantially at right angles to the second side of the supporting component.
According to a preferred development of the invention, the filter elements are composed with sintered together plastics particles, preferably polyethylene particles, which is advantageous in terms of manufacture.
The filter elements, at their afflux surfaces, are preferably provided with a finer-pore coating. Due to this, the filter elements are capable of operating in accordance with the principle of surface filtration so that filtered-out particles do not penetrate into the depth of the material of the filter element and clog the filter element. Filter elements having a finer-pore coating can be cleaned off more easily by the counter-flow pulse principle. The finer-pore coating can be established preferably by fibers and/or particles smaller than those particles of which the filter element main body is composed.
It is possible to provide on the first side of the supporting component a transition piece for providing an, in terms of flow, advantageous transition to a cross-section of flow of different size and/or different geometry. Typical examples are a transition to a smaller cross-section of flow and a transition from a rectangular supporting component to a round cross-section of flow.
The filter unit according to the invention preferably is a filter unit of considerable size. The filter elements, as measured along the viewing direction towards the second side of the supporting component, preferably have a height of at least 50 cm. As seen in the viewing direction towards the first side of the supporting component, the supporting component preferably has a plan view surface area of at least 900 cm
2
.
REFERENCES:
patent: 3950152 (1976-04-01), Guon
patent: 4370376 (1983-01-01), Gangal et al.
patent: 4979969 (1990-12-01), Herding
patent: 5547481 (1996-08-01), Herding et al.
patent: 4211529A1 (1992-04-01), None
patent: 44 18 032 A1 (1995-12-01), None
patent: 0 250 801 (1988-01-01), None
patent: 931062 (1963-07-01), None
patent: WO 96/13320 (1996-05-01), None
Adlhoch Hans-Joachim
Herding Urs
Herding GmbH Filtertechnik
Pham Minh-Chau T.
Simmons David A.
Spencer George H.
Venable
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