Filter with axially shiftable rotating backwash selector

Details Filter with axially shiftable rotating backwash selector Filter with axially shiftable rotating backwash selector

1975-07-29

1977-11-22

Miles, Tim R.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Filter cleaning

210107, 210333A, B01D 2926

Patent

active

040595188

ABSTRACT:
A filter assembly including a housing with a plurality of individual filter units circumferentially arranged within the housing. The housing is compartmented to channel a contaminated fluid to be filtered in a filtering direction through the filter units, from one end thereof to the other. A rotatable, conduit-like backwash arm is disposed in at least one end of the housing for sealed engagement with the contaminated fluid inlet, end of a filter unit and for receiving a backwashing fluid flow therefrom. A rotatable discharge pipe connects to the outlet end of the arm and extends from the housing through a rotary-axial bearing and seal unit thereon, and is coaxially arranged with respect to the circumferential array of filter units. A rotation indexing unit adjacent the housing engages the discharge pipe for angularly shifting said backwash arm from filter unit to filter unit and thereby for backwashing of said filter units in a desired sequence. An axial shift unit engages the discharge pipe for axially shifting the backwash arm away from the filter units preparatory to each angular shift, and for axially shifting the backwash arm into sealed engagement with a new filter unit following such an angular shift. A control coordinates actuation of the rotational indexing unit and axial shift unit for sequentially backwashing filter units of the array. In a modification, a rotatable backwash arm is provided at each end of the array of filter units, movement of the arms being synchronized and the arms being axially opposed for sequentially backwashing the filter unit with a backwashing fluid other than the filtered fluid. In a further modification, the axial shift unit comprises a camming device directly responsive to rotation of the discharge pipe for carrying out the axial shifting of the backwash arm.

REFERENCES:
patent: 808922 (1906-01-01), Herrick
patent: 1919288 (1933-07-01), Bath
patent: 3169109 (1965-02-01), Hirs
patent: 3703465 (1972-11-01), Reece et al.
Adams' Water Strainer--Bulletin 1901, pp. 36 and 4.

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