Gas separation – With nonliquid cleaning means for separating media – Solid agent cleaning member movingly contacts apparatus
Patent
1984-08-09
1986-04-08
Nozick, Bernard
Gas separation
With nonliquid cleaning means for separating media
Solid agent cleaning member movingly contacts apparatus
55334, 55337, 55367, 55379, 55380, 55416, 55429, 55432, 55487, 55498, B01D 5000
Patent
active
045810508
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention refers to a dust collector comprising two communicating casings or tubes a first one of which is arranged to receive dust-laden air from outside and separate therefrom at least coarser particles or components by collecting these at a bottom of the tube, while the second tube embraces a filter unit arranged to separate the remaining particles from the pre-purified air arriving from the first tube before the air leaves the collector, the two tubes being interconnected by means of a conduit extending between the tops of the tubes. Particularly, though not exclusively, the invention refers to dust collectors of the type which are designed for industrial use, e.g. for cleaning building work places, factory floors or the like.
BACKGROUND ART
A dust collector of the above-mentioned type is previously known by the U.S. Pat. No. 3,146,081. In that apparatus the dust-laden air is taken into the coarse separating tube through a duct which extends radially out from the cylindrical tube wall and enters the tube at a point situated below a conical deflector which converges downwardly and is attached to the inside of the tube in order to divide the same in upper and lower chambers. By this design the air taken in will get a turbulent uncontrolled movement which results in a very great fraction of the dust or solid components in the air accompanying the same past the deflector and into the subsequent filter unit. Therefore the latter tends to be rapidly clogged. Further the filter unit consists of a single bag which either--in case it is manufactured with a loose fibre structure--will let a great fraction of fine particles through, or--in case it is manufactured with a fine fibre structure--is clogged extremely rapidly.
BRIEF DISCLOSURE OF THE INVENTION
The present invention aims at eliminating the above-mentioned disadvantages and producing a dust collector which is capable of effectively cleaning air from extremely coarse as well as extremely fine components while maintaining a long lifetime of the filter unit. According to the invention this is achieved by the facts that the first tube consists of a cyclone including an air intake duct which is located in the vicinity of the top of the tube and which, in a manner known per se, extends tangentially in relation to the tube so as to set the sucked-in air in a circulating movement directed downwardly towards the bottom of the tube, as well as a conical funnel which is located between said intake duct and the bottom of the tube and the greatest diameter of which is smaller than the diameter of the tube in order to allow the air to pass the funnel and the inside of the tube, said funnel converging upwardly towards the top of the tube so as to pick up at the lower part thereof the pre-purified air flowing up from the bottom of the tube and pass it on to the second tube through said interconnecting conduit, and that the filter unit in the second tube includes at least two concentrically in each other arranged bag- or shall-like filter elements the interior one of which serves as a coarse filter first receiving the accepted air from the cyclone tube, said element having a relatively loose structure, while the exterior one serves as a fine- or micro-filter having a more compact structure than the coarse filter, said coarse filter and fine filter respectively being mountable as well as dismountable as one single integral unit in said second tube.
By the fact that one of the two tubes consists of a cyclone the dust collector according to the invention will give a very effective coarse separation (in practice 70% or more) of the solid particles contained in the incoming air; meaning that the accepted air which is passed on to the filter unit will contain only a comparatively small fraction of contaminations. Hence it follows that the filter unit will get a long lifetime. By the fact that the filter unit is composed of a coarse filter first receiving the air coming in from the cyclone tube as well as a fine filter arranged on the outside of the
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patent: 2467503 (1949-04-01), Scriven
patent: 2596807 (1952-05-01), Dippel
patent: 2729303 (1956-01-01), McMahan
patent: 3146081 (1964-08-01), Emdy
patent: 3172743 (1965-03-01), Kowalewski
patent: 3240000 (1966-03-01), Hayes et al.
patent: 3308609 (1967-03-01), McCullock
patent: 3543325 (1970-12-01), Hamrick
patent: 4229193 (1980-10-01), Miller
patent: 4467494 (1984-08-01), Jones
Industriell Arbetshygien i Soderhamn AB
Nozick Bernard
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