Gas separation – With separating media bypass or system gas pressure relief – Valved bypass means
Patent
1988-05-09
1989-09-19
Spitzer, Robert
Gas separation
With separating media bypass or system gas pressure relief
Valved bypass means
55387, 55475, 55513, 55517, 55DIG33, 422122, B01D 5304
Patent
active
048677701
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a filter cartridge such as may be incorporated in a mask to be worn by personnel operating in hazardous industrial environments, the cartridge serving to remove harmful gases/vapours from air to be inhaled by the user.
Filter cartridges for fulfilling the above function are already known and comprise a layer of granular carbon (for adsorbing harmful gases/vapours) and frequently also a filter element (usually of glass-fibre paper) for removing particulate matter. At least one porous retaining element is provided between the carbon and the filter element for retaining the carbon in position. However, the known cartridges are relatively complicated to manufacture. Thus one known cartridge is produced by introducing the carbon and the porous element into a cylindrical metal housing followed by rolling a circumferential groove in the outside of the housing so that an inner circumferential ridge is formed to retain the porous element in position. Subsequently, the filter element for removing particulate matter is introduced into the housing, located in position by an O-ring seal provided between the housing and the peripheral edge of the filter element a grill is provided on top of the filter element, and the top of the housing is turned over to form a lip to retain the grill and filter element in position.
It is an object of the present invention to provide a filter cartridge which is of simplified construction as compared to the prior art cartridges.
According to the present invention there is provided a filter cartridge incorporating a layer of granular material for adsorbing gases and/or vapours retained in position by a porous retaining element, the cartridge having an air inlet and an air outlet to allow passage of air through the cartridge, the cartridge comprising a housing and a closure element closing the housing, the closure element being associated with a compression element which during assembly of the closure element on the housing acts against the retaining element to compress the granular material.
The filter cartridge preferably also includes a filter element for the removal of particulate matter.
Preferably the compression element is a flange provided around the closure element and located within the housing. Preferably also this filter element for particulate material (when used) is located within the bounds of said flange.
The invention will be further described by way of example only with reference to the accompanying drawings, in which:
FIG. 1 is an exploded view of one embodiment of filter cartridge in accordance with the invention;
FIG. 2 is a sectional view of the housing of the cartridge shown in FIG. 1;
FIG. 3 is a part sectional view (on the line III--III of FIG. 4) of the closure element of the cartridge shown in FIG. 1;
FIG. 4 is a top plan view of the closure element shown in FIG. 3;
FIG. 5 is an underside plan view of the closure element shown in FIG. 3; and
FIG. 6 is a sectional view of the assembled cartridge.
Referring to FIG. 1, the illustrated cartridge 1 comprises a plastics housing 2, a plastics closure element 3, and an arrangement 4 of filter elements which will be described in more detail below.
Housing 2 is illustrated in FIG. 2 and will be seen to comprise an open-topped generally cylindrical body 5 with a base 6 in which is an aperture 7 bounded by a screw-threaded abutment 8. Base 6 slopes slightly (e.g. at 21/2.degree.) from body 5 to aperture 7 and fins 6a are provided on the base 6 to provide a level support for filter elements 4.
Closure element 3 is illustrated in FIGS. 3 to 5 and will be seen to comprise a generally circular top portion 9, a first annular flange 10 provided generally around, but slightly inwardly of, the peripheral edge region of top portion 9, and a second annular flange 11 encircling flange 10. As will be seen from FIG. 3, flange 10 is of greater height than flange 11, for reasons which will be described. Additionally, the outer diameter of flange 10 is slightly less than the inner diameter of body 5 of housi
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Protector Safety Limited
Spitzer Robert
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