US 6,641,737 B2Granted

Vertical filter

AssigneeAshbrook Corporation

InventorsYongming Xia, James E. Thompson, Jeffrey S. Devine

Life of this patent

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Abstract

A liquid filtering apparatus is placed in a vessel having a bed of filtration material and an intake for introducing unfiltered liquid, that includes a washbox, an airlifting tube extending from the washbox and including an intake end and means for introducing a primary gas to the airlifting tube, the airlifting tube passing through a central pipe, which extends from just below the washbox to a position just above the intake end. At least one screen cartridge is oriented in a generally angular downward direction in the bed and is in communication with an effluent chamber defined in part by the outer surface of the central pipe. A reject line extends from the washbox, and an effluent collector extends from the effluent chamber. A method of filtering and cleaning the filtration material is also disclosed.

Claims18

Dependent claims

A method of filtering liquid and continuously cleaning an associated filter bed comprising:

(a) placing a liquid filtering apparatus in a vessel having a bed of filtration material and introducing unfiltered liquid into an upper region of the vessel;
(b) filtering the unfiltered liquid through the bed in a downward direction;
(c) collecting filtered liquid in at least one screen cartridge, and conveying the filtered liquid upward into an effluent chamber;
(d) removing the filtered liquid from the effluent chamber by way of an effluent collector;
(e) withdrawing a mixture of filtered liquid and dirtied filtration material from a lower portion of the bed of filtration material by way of an airlifting tube;
(f) washing the dirtied filtration material by deflecting the mixture off of a surface and separating the dirt from the filtration material;
(g) collecting the dirt and liquid separated in step (f) and removing it by way of a reject line;
and
(h) depositing the washed filtration material to the top of the bed of filtration material.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/237,554Filed 9 Sep 2002 · continuation in part
Priority: 20 Apr 2000
Published: US 2003/0066792 A110 Apr 2003
Granted: 4 Nov 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B01D 36/02
Filter circuits or combinations of filters with other separating devices: combinations of filters of different kinds
B01D 24/30
With the filter bed moving during the filtration: translation
B01D 24/42
Feed or discharge devices: for discharging filtrate
B01D 24/4684
By moving the filtering element: using spray devices

Family

Application09/553,511Parent of this division · filed 20 Apr 2000
Application09/966,317Parent of this continuation-in-part · filed 27 Sep 2001
US 2003/0066792 A1Pre-grant publication · published 10 Apr 2003
US 6,517,712 B2Parent of this continuation-in-part
Application09/966,317Parent of this division
US 6,319,413 B1Parent of this division
US 2002/0036164 A1Published application
US 6,641,737 B2This patent

From the US filing history. Foreign family members aren’t listed.