Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1989-04-10
1990-03-06
Hart, Charles
Gas separation
Means within gas stream for conducting concentrate to collector
55343, 55344, 55361, 55470, 55473, 55DIG3, B01D 4604
Patent
active
049062590
ABSTRACT:
A pre-filter apparatus for use in conjunction with a vacuum cleaner, and which is used to pre-filter the dirt and dust-filled air by a method of negative pressure filtration in order to substantially reduce the volume of air suspending the same amount of dirt before it enters the vacuum cleaner bag, and to continously self-clean the pre-filter. The result is to obtain air without small, filter-clogging particulates by first aggregating them into larger particles before they get to the vacuum cleaner bag so that what enters the vacuum cleaner bag are big clumps which would not have many small particles that can effectively clog up the filter bag. The invention includes the concept of having a smaller suction force siphon off some air through various pre-filter membranes while a larger suction force pulls the dirt particles away from the pre-filter membranes by a negative pressure to keep them continuously clean and maintain their filtration efficiency.
REFERENCES:
patent: 4735639 (1988-04-01), Johnstone
Hart Charles
Rozsa Thomas I.
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