Filter apparatus
First Claim
1. A filter apparatus for contaminated air containing contaminents such as dust particles and smoke, said apparatus comprising:
- an apparatus housing (6) having upright sides and a top side, said apparatus housing (6) having a suction opening (44) for the contaminated air and an external air exhaust (33) for filtered air;
means in the housing defining a flow path connecting said suction opening (44) and said air exhaust (33), said flow path defining a flow direction;
a suction fan (8) having an inlet (13) and an outlet (14), said suction fan (8) being interposed in said flow path between a suction part and a pressure part of the flow path;
at least two filter units (39, 36, 38, 26,
34) interposed in said flow path between said suction opneing (44) and said air exhaust (33), at least one of said filter units having at least one flat filter (39,
38) covering at least a part of a cross-section of a flat filter housing (35) disposed in the flow path, wherein a cartridge filter (3) having a plurality of parallel-connected filter cartridges (26) is provided downstream along the flow direction from the flat filter (39,
38) and the outlet (14) of the suction fan in the pressure part of the flow path, said cartridge filter (3) having an inlet base (23) mounted on a top side of the housing.
1 Assignment
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Accused Products
Abstract
A filter apparatus, particularly for filtering air containing fumes is provided on the inlet side to an exhaust fan (8), electrostatic filters (36) and a flat test filter (38) immediately following the latter. On the outlet side of the exhaust fan (8) a cartridge filter (3) with a plurality of parallel filter cartridges (26) in the flow path is provided. In the flow path directly upstream of the test filter 38, as well as between outlet (14) and the inlet of cartridge filter (3), the pressure is measured by in each case one pressure indicating device (53, 54). When the electrostatic filter (36) becomes saturated, the contamination relatively rapidly increases the flow resistance of test filter (38), which is indicated by a pressure change between the electrostatic filter (36) and the test filter (38). If electrostatic filter (36) is not cleaned, then contamination then increases the flow resistance of cartridge filter (13), which is indicated by a pressure change in the flow path directly upstream of the cartridge filter (3). If there is still no cleaning or replacement of electrostatic filter (36), then the flow resistance becomes higher than the suction force of exhaust fan (8), so that the fact that no further suction is taking place is made immediately apparent.
56 Citations
21 Claims
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1. A filter apparatus for contaminated air containing contaminents such as dust particles and smoke, said apparatus comprising:
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an apparatus housing (6) having upright sides and a top side, said apparatus housing (6) having a suction opening (44) for the contaminated air and an external air exhaust (33) for filtered air; means in the housing defining a flow path connecting said suction opening (44) and said air exhaust (33), said flow path defining a flow direction; a suction fan (8) having an inlet (13) and an outlet (14), said suction fan (8) being interposed in said flow path between a suction part and a pressure part of the flow path; at least two filter units (39, 36, 38, 26,
34) interposed in said flow path between said suction opneing (44) and said air exhaust (33), at least one of said filter units having at least one flat filter (39,
38) covering at least a part of a cross-section of a flat filter housing (35) disposed in the flow path, wherein a cartridge filter (3) having a plurality of parallel-connected filter cartridges (26) is provided downstream along the flow direction from the flat filter (39,
38) and the outlet (14) of the suction fan in the pressure part of the flow path, said cartridge filter (3) having an inlet base (23) mounted on a top side of the housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification