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US 4,935,126 AGranted
Filtering apparatus
OwnerMordeki Droriinventor
Life of this patent
Estimating the term…
Abstract
A fluid filter comprising a housing defining a fluid inlet and a fluid outlet, a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis, and backflushing means for removing filtered out sediment from the filter element comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head.
Claims48
A fluid filter comprising:
- a housing defining a fluid inlet and a fluid outlet;
- a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis;
- and
- backflushing means for removing filtered out sediment from the filter element, said backflushing means comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head,
- said fluid filter also comprising a filter aid material located within said housing and in engagement with the upstream surface of said filter element.
2 more elements
A fluid filter comprising:
- a housing defining a fluid inlet and a fluid outlet;
- a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis;
- and
- backflushing means for removing filtered out sediment from the filter element, said backflushing means comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head,
- wherein said rotating head comprises at least one fluid outlet arranged to provide an eccentrically directed stream for driving the rotating head in said rotational motion.
2 more elements
A fluid filter comprising:
- a housing defining a fluid inlet and a fluid outlet;
- a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stck of filter disks defining a hollow volume interiorly thereof and a longitudinal axis;
- and
- backflushing means for removing filtered out sediment from the filter element, said backflushing means comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head, and wherein said filter element is characterized in that the stack of filter disks comprises a plurality of co-operating filter disk defining a plurality of paired co-operating filter surfaces, comprising:
- a first surface defining a plurality of spaced, generally circumferentially extending raised line portions separated by generally circumferentially extending grooves;
- and
- a second surface defining a plurality of generally radially extending fingers each outlined by a raised line portion, the exterior of the fingers communicating with either one of the upstream side or the downstream side and the interiors of the fingers communicating with the other one of the upstream side or the downstream side,
- said fluid filter also comprising a filter aid located within said housing and in engagement with the upstream surface of said filter element, and wherein said filter aid is a material selected from the group consisting of diatomaceous earth, plastic-coated diatomaceous earth, diatomaceous silica, bentonites, carbon, asbestos, cellulose, perlite, pumice, pumicite, obsidian, pitchstone, volcanic ash, volcanic glass, attapulgite clay, wood pulp, fly ash, kieselguhr, a combination of perlite and diatomaceous earth, or calcium hypochlorite.
5 more elements
A fluid filter comprising:
- a housing defining a fluid inlet and a fluid outlet;
- a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stck of filter disks defining a hollow volume interiorly thereof and a longitudinal axis;
- and
- backflushing means for removing filtered out sediment from the filter element, said backflushing means comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head, wherein said filter element comprises a multiplicity of disk-like elements of a porous material separated by a multiplicity of grooved spacer disk elements, each spacer disk element defining axially tapered generally radially extending grooves, said fluid filter also comprising a filter aid located within said housing and in engagement with the upstream surface of said filter element.
1 more element
A fluid filter comprising:
- a housing defining a fluid inlet and a fluid outlet;
- a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis;
- and
- backflushing means for removing filtered out sediment from the filter element, said backflushing means comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head,
- wherein said filter element comprises a multiplicity of disk-like elements of a porous material separated by a multiplicity of grooved spacer disk elements, each spacer disk element defining axially tapered generally radially extending grooves, wherein said grooves defined by each of said multiplicity of spacer disk elements comprise, on a first side of the spacer disk element, axially tapered generally radially extending grooves opening to a downstream side, and on a second side of the spacer disk element, axially tapered generally radially extending grooves opening to an upstream side, and wherein for each spacer disk element there are defined first and second peripheral sealing rims on the first side of the spacer disk element and third and fourth peripheral sealing rims on the second side of the spacer disk element for providing sealing engagement with said porous material interposed between adjacent stacked disks, whereby fluid entering an individual one of said grooves from the upstream side of the filter element during normal filtering may only exit the groove via the porous material to the downstream side of the filter element and whereby fluid entering an individual one of said grooves from the downstream side of the filter element during backflushing can only exit the groove via the porous material to the upstream side of the filter element.
2 more elements
A fluid filter comprising:
- a housing defining a fluid inlet and a fluid outlet;
- a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis;
- and
- backflushing means for removing filtered out sediment from the filter element, said backflushing means comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head,
- wherein said jet comprises a concentrated, relatively high pressure flow of backflushing liquid directed to the filter element from the downstream side thereof to the upstream side thereof and wherein said nozzle assembly is arranged to be movable axially, generally parallel to the longitudinal axis, such that the relatively high pressure flow sequentially engages different regions of the filter element for sequential backflushing thereof, said filter also comprising a filter aid located within said housing and in engagement with the upstream surface of said filter element, said filter aid being selected from the group consisting of diatomaceous earth, plastic-coated diatomaceous earth, diatomaceous silica, bentonites, carbon, asbestos, cellulose, perlite, pumice, pumicite, obsidian, pitchstone, volcanic ash, volcanic glass, attapulgite clay, wood pulp, fly ash, kieselguhr, a combination of perlite and diatomaceous earth, and calcium hypochlorite.
2 more elements
A fluid filter comprising:
- a housing defining a fluid inlet and a fluid outlet;
- a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis;
- and
- backflushing means for removing filtered out sediment from the filter element, said backflushing means comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head, wherein said backflushing means comprises means for providing a concentrated, relatively high pressure flow of backflushing liquid to the filter element directed from the downstream side to the upstream side and arranged to be movable axially, generally parallel to the longitudinal axis, such that the relatively high pressure flow sequentially engages different regions of the filter element for sequential backflushing thereof, wherein said means for providing comprises a fluid discharge device arranged for axial movement along the hollow volume in communication with the downstream side,
- and wherein said fluid discharge device comprises fluid driven means for providing rotation of the relatively high pressure flow about the longitudinal axis.
2 more elements
A fluid filter comprising:
- a housing defining a fluid inlet and a fluid outlet;
- a filter element defining an upstream surface communicating with the fluid inlet and a downstream cylindrical surface communicating with the fluid outlet, the filter element comprising a stack of filter disks defining a hollow volume interiorly thereof and a longitudinal axis;
- and
- backflushing means for removing filtered out sediment from the filter element, said backflushing means comprising an axially displaceable backflushing nozzle assembly disposed within the hollow volume comprising a rotating head coupled to the fluid inlet and having fluid outlet means, arranged to provide a generally radially directed pressurized jet and rotational motion of the rotating head,
- wherein said stack of filter disks is disposed with in the housing for separating solid particles from a fluid flowing between the filter disks from the upstream side of the filter element to the downstream side thereof and characterized in that the stack comprises a plurality of co-operating filter disks defining a plurality of paired co-operating filter surfaces, comprising a first surface defining a first array of grooves, extending in a first orientation, and a second surface defining an undulating strip defining a second array of grooves facing the first array of grooves and extending in a second orientation, skewed with respect to the first orientation, one side of the undulating strip communicating with the upstream side and the other side of the undulating strip communicating with the downstream side.
2 more elements
Dependencies are inferred from the claim text.