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US 5,591,240 AGranted
Powder paint booth backflow filter apparatus
OwnerHermann Ophardt, Heiner Ophardtinventors
Life of this patent
Estimating the term…
Abstract
A novel filtering apparatus particularly adapted for a transportable, modular powder spray painting booth with backflow cleaning capability by having two sets of filters each associated with a separate output chamber such that in normal use, a vacuum draws air from the paint booth through both filters and in backflow use, the same vacuum draws air through one filter in a normal filtering manner but with the air first drawn through the other filter in a backflow manner.
Claims19
An apparatus for depositing particulate matter on an article comprising,
- housing chamber means for housing said article while said particulate matter is deposited thereon,
- collection chamber means for collecting excess particulate matter entrained in gas, the collection chamber means including first outlet means, and second outlet means,
- inletway means providing gaseous communication between said housing chamber and said collection chamber means,
- inlet valve means operable to assume an open position permitting gas flow from said housing chamber means through said inletway means into the collection chamber means, and a closed position closing said inletway means,
- vacuum means for evacuating said collection chamber means to a negative pressure,
- particulate matter filtration means comprising first filter means across said first outlet means and second filter means across said second outlet means,
- first conduit means including first conduit valve means operable to selectively connect the first outlet means to either:
- (a) said vacuum means, whereby said vacuum means draws gas outwardly from said collection chamber means through said first filter means via said first outlet means, or
- (b) a first source of gas at a pressure above pressure drawn by said vacuum means, whereby the first conduit means permits gas from the first source of gas to backflow into the collection chamber means through the first filter means via said first outlet means,
- second conduit means including second conduit valve means operable to selectively connect the second outlet means to either:
- (a) said vacuum means, whereby said vacuum means draws gas outwardly from said collection chamber means through the second filter means via the second outlet means, or
- (b) a second source of gas at a pressure above pressure drawn by the vacuum means, whereby the second conduit means permits gas from the second source of gas to backflow into the collection chamber means through the second filter means via said second outlet means.
9 more elements
An apparatus for electrostatically depositing powder on an article therein and for recovering surplus powder comprising:
- housing chamber means for housing said article, and having a lower hopper section,
- collection chamber means for collecting said surplus powder and including an upper chamber portion opening downwardly into a lower chamber portion, first outlet means, and second outlet means,
- the lower hopper portion of the collection chamber means located under the lower hopper section of the housing chamber means, and the collection chamber means in communication with the housing chamber means by an inletway means providing communication downwardly from the lower hopper section of the housing chamber means into the collection chamber means,
- the inletway means communicating with the collection chamber means such that powder passing through the inletway means which is not entrained by moving air drops under gravity from the inletway means into the lower hopper portion of the collection chamber means,
- inlet valve means operable to either permit or prevent air and said powder to flow from the housing chamber means through the inletway means into the collection chamber means,
- vacuum conduit means for connection to vacuum means for evacuating said collection chamber means to a negative pressure,
- powder filtration means comprising first filter means across said first outlet means and second filter means across said second outlet means,
- first conduit means including first conduit valve means operable to selectively connect the first outlet means to either:
- (a) said vacuum conduit means, whereby said vacuum means draws air outwardly from said collection chamber means through said first filter means via said first outlet means and powder entrained by said air is retained on said first filter means, or
- (b) a source of air at a pressure above pressure drawn by said vacuum means, whereby the first conduit means permits air to backflow into the collection chamber means through the first filter means via said first outlet means to dislodge powder retained on said first filter means,
- second conduit means including second conduit valve means operable to selectively connect the second outlet means to either:
- (a) said vacuum conduit means, whereby said vacuum means draws air outwardly from said collection chamber means through the second filter means via the second outlet means and powder entrained by said air is retained on said second filter means, or
- (b) a source of air at a pressure above pressure drawn by the vacuum means, whereby the second conduit means permits air to backflow into the collection chamber.
10 more elements
Dependencies are inferred from the claim text.