Gas separation – With means facilitating transportability or handling of... – Handle feature for apparatus or part thereof
Patent
1981-06-15
1983-04-05
Nozick, Bernard
Gas separation
With means facilitating transportability or handling of...
Handle feature for apparatus or part thereof
55481, 55502, 55504, 55506, 55DIG9, B01D 4600
Patent
active
043789838
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a housing for the mounting of high efficiency particulate arresting (HEPA) filters used, inter alia, in microbiological isolation facilities. The filters typically form part of air conditioning or ventilation systems used in heating, cooling or ventilation of environments which are microbiologically contaminated or sterile.
HEPA filters are usually of multiple pleated construction. The nature and relationship of the pleats may vary but the filters are commonly comparatively bulky and of generally box-like form. A long standing difficulty has been to provide an installation for satisfactorily mounting HEPA filters in such a way that the installation will not negate the rated performance of the filter (for example, an arrestance efficiency of 99.97% or 99.99% when challenged with a mono disperse cloud of 0.3 micro meter Dioctyl Phthalate droplets) while on the one hand allowing easy access for installation of the filter and for leak testing in situ, and on the other permitting acceptable gaseous decontamination. This is measured by achieving a complete kill of a known number of spores of the micro organism Bacillus subtilis var niger.
The present invention accordingly provides a housing for mounting HEPA filters, comprising:
an open-ended tubular casing;
slide structure within said casing for slidably mounting a HEPA filter from one of the ends of the casing to a position intermediate said ends;
baffle means disposed to divide the interior of said casing into respective chambers which, on mounting of the filter in said slide structure are gastight isolated from each other except by way of the filter and which are accessible from a respective one of the open ends of the casing;
gas intake/exhaust ports for each of said chambers;
a pair of cover members for closing the respective open-ends of the casing, each of which cover members includes a flange complementary to the associated end of the casing; and
respective clamp and seal means for clamping the cover members to said casing to effect gastight engagement of said flanges with the respective ends of the casing.
The cover members are preferably of shallow convex configuration and may be provided with a pair of spaced handles to facilitate their application to and removal from the housing. Each clamp and seal means may comprise a band arranged to be clamped about the respective flange and a sealing ring arranged to seat between the flange and the associated end of the casing.
Said slide structure may comprise a set of guide rails secured to the inside surface of said casing so as to extend parallel to the centre axis thereof. The rails may define four corner edge tracks for a rectangular HEPA filter and are advantageously of lipped W-configuration. Such structure may be secured wholly within one of said chambers and advantageously includes means for fastening the filter in firm engagement with said baffle means.
The tubular casing is advantageously of circular or elliptical cross-section and may include a pair of co-axial but axially displaced tubular parts joined but separated by an annular extension of said baffle means.
The invention will be further described, by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 is a side elevational view of a HEPA filter housing constructed in accordance with the invention;
FIG. 2 is a partly exploded vertical axial cross-section through the housing shown in FIG. 1, without the HEPA filter in place;
FIG. 3 is a less detailed view similar to that of FIG. 2 but showing the housing installed in a building with the HEPA filter and associated butterfly isolating valves connected in place.
FIG. 4 is an end elevational view from the left in FIG. 1;
FIG. 5 is a cross-section on the line 5--5 in FIG. 1 with a filter in place;
FIG. 6 is a cross-section on the line 6--6 in FIG. 2;
FIG. 7 is an enlargement of the region X of FIG. 2;
FIGS. 8 and 9 are enlargements of portions of FIGS. 2 and 5 respectively, depicting portion of the filter slide structure, but showing the filter
REFERENCES:
patent: 4023944 (1977-05-01), Beane
patent: 4247315 (1981-01-01), Neumann
Nozick Bernard
The Commonwealth of Australia
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