Abstract A method and apparatus for cleaning a fabric tubular type filter element in a dust collector by imparting a momentary pneumatic pulse to the filter element at predetermined intervals. The pulse is imparted to the filter by reversing the direction of the air flow through it and immediately thereafter restoring normal flow of air through the filter element, all within a period of a fraction of a second. The apparatus includes a high speed electric motor having an extension on its shaft which is directly coupled to a valve member through a screw and nut coupling. The valve member is movable in a direction extending axially of the motor axis and is disposed between two aligned but spaced apart valve seats, one of which is in communication with a source of less-than-air pressure and the other of which is in communication with the atmosphere. As the valve moves from one seat to the other, communication between the filter element and the source of less-than-air pressure is shut off and simultaneously the filter element is in communication with the atmosphere. The motor is reversed as soon as the valve shuts off the source of less-thanair pressure and the valve seat is immediately returned to its original position, where it shuts off communication between the filter element and the atmosphere. The motor is actuated at cyclic intervals by any one of various forms of timing or pressure responsive devices.
A bag-type filtration device for removing particulates from a gaseous stream comprising: a. a sealed housing having an inlet for the gaseous stream and a plurality of outlet apertures formed in said housing through which cleaned gases are discharged; b. a plurality of bag-shaped filtering elements which are tautly disposed and arranged in the housing with the mouths of said bags being fixed into said outlet apertures so that the gases from the inlet gaseous stream pass inward through the walls of the bags while particulates are collected on the exteriors of said bags; c. a conduit which is in gaseous-flow communication with said outlet apertures and which extends exteriorly to said housing, said conduit having a closed end and a pair of aligned opposed openings formed through its walls adjacent said closed end, one of said openings of said pair being open to the atmosphere; d. means for inducing a gaseous flow at less-than-atmosphereic air pressure, said flow-inducing means being connected in gaseous-flow communication with the other opening of said pair; e. a valve member arranged within said conduit and mounted on a shaft stem for selective movement from one side to the other of said conduit between said pair of openings, said valve member having opposite surfaces defining faces which are adapted for alternatively closing respective ones of said openings of said pair; f. linearly exTensible reversible electric motor means including a motor shaft connected to said valve member by means including said shaft stem for selectively reciprocally moving said valve across said conduit, thereby to place the interiors of said filtering elements alternatively in communication with the atmosphere and with said flow inducing means.
Claim 2
Dependent Claim
277 words
A bag-type filtration device for removing particulates from a gaseous stream comprising: a. a sealed housing having an inlet for the gaseous stream and a plurality of outlet apertures formed in said housing through which cleaned gases are discharged; b. a plurality of bag-shaped filtering elements which are tautly disposed and arranged in the housing with the mouths of said bags being fixed into said outlet apertures so that the gases from the inlet gaseous stream pass inward through the walls of the bags while particulates are collected on the exteriors of said bags; c. a conduit which is in gaseous-flow communication with said outlet apertures and which extends exteriorly to said housing, said conduit having a closed end and a pair of aligned opposed openings formed through its walls adjacent said closed end, one of said openings of said pair being open to the atmosphere; d. means for inducing a gaseous flow at less-than-atmosphereic air pressure, said flow-inducing means being connected in gaseous-flow communication with the other opening of said pair; e. a valve member arranged within said conduit and mounted on a shaft stem for selective movement from one side to the other of said conduit between said pair of openings, said valve member having opposite surfaces defining faces which are adapted for alternatively closing respective ones of said openings of said pair; f. linearly exTensible reversible electric motor means including a motor shaft connected to said valve member by means including said shaft stem for selectively reciprocally moving said valve across said conduit, thereby to place the interiors of said filtering elements alternatively in communication with the atmosphere and with said flow inducing means.