Device including a compact spray nozzle for cleaning a filter cloth in a disc filter

Patent metadata

Field	Value
Publication number	US-9938159-B2
Application number	US-201113879256-A
Country	US
Kind code	B2
Filing date	Oct 7, 2011
Priority date	Oct 21, 2010
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A device is provided for cleaning a filter cloth that forms a part of a filter element in a rotary disc filter. The device includes a flush tube and a spray nozzle operatively connected to the flush tube for receiving a cleaning fluid from the flush tube and directing the cleaning fluid onto the filter cloth.

First claim

The invention claimed is:

1. A rotary disc filter comprising: at least first and second adjacent and parallel filter elements forming a part of the rotary disc filter and including filter cloth for filtering water; a device for cleaning the filter cloth comprising at least one flush tube having a central axis that is located generally between the first and second adjacent and parallel filter elements and wherein the central axis of the flush tube lies in a plane that is parallel to the first and second parallel filter elements; outlets in the flush tube; first and second spray nozzles associated with the flush tube and operatively connected to the outlets of the flush tube for permitting cleaning liquid to flow from the flush tube to the first and second spray nozzles; each of the first and second spray nozzles including an outlet opening and an angled redirecting channel for redirecting the cleaning fluid in a direction towards the filter cloth of one of the first or second parallel filter elements; the first and second spray nozzles arranged around the flush tube; wherein the outlet opening of the first spray nozzle is directed towards the first filter element; wherein the outlet opening of the second spray nozzle is directed towards the second filter element; wherein the flush tube and the first and second spray nozzles are disposed in an operative cleaning position between and inside the first and second filter elements and wherein the first spray nozzle is operative to direct the cleaning fluid onto the first filter element and the second spray nozzle is operative to direct the cleaning fluid onto the second filter element, and wherein in said operative cleaning position, the shortest distance between the outlet opening of the first spray nozzle and the first filter element is larger than half the distance between the first and second filter elements and wherein the shortest distance between the outlet opening of the second spray nozzle and the second filter element is larger than half the distance between the first and second filter elements; and wherein the outlet openings of each of the first and second spray nozzles is located behind said plane relative to the direction of the cleaning fluid emitted by each outlet opening.

2. The rotary disc filter of claim 1 wherein the first and second spray nozzles are arranged directly on the flush tube.

3. The rotary disc filter of claim 1 wherein respective spray nozzles are detachably connected to an adapter that is supported at least indirectly by the flush tube.

4. The rotary disc filter of claim 1 wherein each outlet of the flush tube is operative to direct the cleaning fluid to a respective spray nozzle, and wherein the cleaning fluid passing through the outlet moves in a direction opposite the movement of the cleaning fluid dispersed through the outlet opening of the respective spray nozzle.

5. The rotary disc filter of claim 3 wherein the adapter includes the angled redirecting channel.

6. The rotary disc filter of claim 1 wherein the flush tube is moveable within an area defined by the circumference of the filter elements.

7. The rotary disc filter of claim 1 wherein the spacing between the first and second parallel filter elements is less than 16 cm.

8. The rotary disc filter of claim 1 wherein the outlet opening of the spray nozzles is between 7 and 8 cm from the filter cloth to be cleaned by the spray nozzles.

9. A rotary disc filter comprising:
first and second parallel filter elements with each filter element including filter cloth for filtering water;
a cleaning device for spraying a cleaning fluid onto the filter cloth, the cleaning device comprising:
i. a flush tube having a central axis which extends between the first and second parallel filter elements and wherein the central axis of the flush tube lies in a plane that is parallel to the first and second parallel filter elements;
ii. an outlet for permitting the cleaning fluid to flow from the flush tube;
iii. a first spray nozzle aimed at the first filter element and operatively connected to the outlet such that the cleaning fluid flows from the flush tube through the outlet into the first spray nozzle;
iv. an angled redirecting channel forming a part of the cleaning device for distributing the cleaning fluid in a general direction towards the first filter element that the first spray nozzle is aimed towards;
v. the first spray nozzle including an outlet opening aimed at the first filter element; and
vi. wherein the outlet opening of the first spray nozzle is located behind said plane relative to the first filter element and the first spray nozzle and relative to the direction of the cleaning fluid emitted by the first spray nozzle; and
wherein the flush tube and the first spray nozzle are disposed in an operative cleaning position between and inside the first and second filter elements and wherein the first spray nozzle is operative to direct the cleaning fluid from the first spray nozzle onto the first filter element and wherein in said operative cleaning position the outlet opening of the first spray nozzle is located a distance from the first filter element which is larger than half the distance between the first and second parallel filter elements.

10. The rotary disc filter of claim 9 wherein the cleaning device includes an adapter configured to be secured to the flush tube and wherein the adapter includes the outlet and the angled redirecting channel.

11. The rotary disc filter of claim 10 wherein the first spray nozzle is detachably secured to the adapter.

12. The rotary disc filter of claim 9 wherein the outlet for permitting the cleaning fluid to flow from the flush tube is oriented in a direction other than towards said first filter element that the first spray nozzle is aimed towards.

Assignees

• Larsson Per
• Veolia Water Solutions & Tech

Inventors

• Larsson Per

Classifications

• B01D33/155

  the filtering surface being parallel to the rotation axis · CPC title

• B01D33/23

  Construction of discs or component sectors thereof · CPC title

• B01D33/21 Primary

  with hollow filtering discs transversely mounted on a hollow rotary shaft · CPC title

• C02F1/001 Primary

  Processes for the treatment of water whereby the filtration technique is of importance (C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00) · CPC title

• B01D33/215

  the filtering discs being fixed inwardly on a rotating construction · CPC title