US 4,157,899 AGranted

Pulsed backflush air filter

AssigneeCEA Carter-Day Company

InventorBruce M. Wheaton

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Abstract

A cleaning system for sleeve-type air filters featuring top removal of sleeves of the filtering media and increased filtering capacity, using sharply pulsed backflushing air of short duration from a single source for cleaning the sleeves which requires substantially less power and simpler mechanical structure than conventional filters of similar capacity. Filter sleeves depend from clean air outlet ports which are arrayed in concentric rings in a porting plate in closely-spaced relation one from the next at uniform circular and radial pitches allowing more sleeves to be packed in the porting plate which separates the clean air section from the dusty air section of said filter and more capacity from the same size filter than was heretofore possible. A tank is repetitively charged with air to a set pressure by a pump and the pressurized air is released by a pulse generating valve for distribution of the air to said sleeves for backflushing at essentially random frequency. Each sleeve in the filter receives, on the average, one pulse of cleaning air every 2 to 5 minutes.

Claims12

Dependent claims

A gas filter apparatus having a housing body including a dusty gas section with an inlet thereto and a clean gas section with an outlet therefrom, the improvement comprising:

(a) a porting plate mounted in said body separating the dusty gas section from the clean gas section and having a plurality of concentric rings of ports in said porting plate which are circularly-spaced thereon at approximately uniform pitch, each port in a ring having a filter media sleeve depending therefrom;
(b) a means mounted on said body for generating pulses of backflushing gas from a single source at a predetermined frequency having an outlet therefrom;
and
(c) a rotary backflushing gas pulse distributing means extending radially across and spaced above the concentric rings of ports in said porting plate within the clean gas section having an inlet in fluid communication with the outlet of said backflushing gas pulse generator means and a plurality of radially-spaced orifices therefrom, each of said orifices being spaced to rotationally traverse over and successively fluid communicate with each of the ports in a like radially spaced concentric ring;
whereby each port in each ring successively registers with the corresponding orifice in the backflushing gas pulse distributing means as it rotates over the port plate at a frequency which is not an even multiple of the pulse generating frequency of said pulse generator means.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/840,820Filed 11 Oct 1977
Granted: 12 Jun 1979
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B01D 46/04
Particle separators, e.g. dust precipitators, having hollow filters made of flexible material: cleaning filters
B01D 46/0046
For feeding: provoking a tangential stream
B01D 46/4272
Auxiliary equipment or operation thereof: special valve constructions adapted to filters or filter elements
B01D 46/71
By acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter: with pressurised gas, e.g. pulsed air