Filter system with backflush

A filter system according to any one of the preceding claims, wherein the filter element and the backflush device are configured to move relative to each other to provide the backflush fluid flow across a filter surface of the filter element.

A filter system according to any one of the preceding claims, wherein the filter element comprises a generally cylindrical filter element that is configured to rotate about its longitudinal axis to provide the backflush fluid flow across the curved surface of the filter element.

A filter system according to any one of the preceding claims, wherein the filter element defines an internal volume in which the backflush device is disposed, and the filter system is configured to provide filtration by passing a fluid to be filtered from an external volume surrounding the filter element through at least the portion of a filter surface of the filter element into the internal volume of the filter element.

A filter system according to any one of the preceding claims, wherein the backflush device is disposed within the filter element and configured to provide the backflush fluid flow radially outwards through at least the portion of a filter surface of the filter element.

A filter system according to any one of the preceding claims, wherein a surface of the backflush device comprising the at least two outlets is substantially coplanar with a filter surface of the filter element.

A filter system according to any one of the preceding claims, wherein the spacing between the at least two outlets of the backflush device and the filter element is 15 mm or less, preferably 10 mm or less, for example 5 mm or less.

A filter system according to any one of the preceding claims, wherein the backflush device is configured to provide a backflush fluid flow spanning a longitudinal length of the filter element so that relative movement of the backflush device and filter element can provide the backflush fluid flow across substantially all of a filter surface of the filter element.

A filter system according to any one of the preceding claims, wherein the filter element is configured to support a filtration means attached and sealed around the periphery of a filter surface of the filter element to cover a filter surface of the filter element, for example wherein the filter element comprises a generally cylindrical filter element and a filtration means can be attached and sealed around the upper and lower circumferences of the filter element.

A filter system according to any one of the preceding claims, wherein the backflush device comprises one or more baffles arranged at the periphery of the at least two separate outlets, the baffles configured to direct a flow of backflush fluid within the backflush device towards the at least two separate outlets, for example wherein the at least two separate outlets are separated by one or more baffles that extend from an external surface comprising the at least two outlets towards an internal volume of the backflush device.

A filter system according to any one of the preceding claims, wherein the backflush device comprises an elongate body configured to receive a flow of backflush fluid, the at least two separate outlets configured to permit a flow of backflush fluid radially from an internal volume of the elongate body through an outward-facing surface of the elongate body, wherein the at least two separate outlets are angularly offset from each other relative to a longitudinal axis of the elongate body.

A filter system according to any one of the preceding claims, wherein the at least two outlets are arranged along a straight or curved line on the surface of the backflush device to provide the backflush fluid flow along the length of the straight or curved line.

A filter system according to any one of the preceding claims, wherein the backflush device is coupled at a central shaft within a generally cylindrical filter element and extends radially therefrom towards the curved surface of the filter element.

A filter system comprising a filter element and a backflush device, wherein:

• the filter element comprises one or more elongate supporting portions for supporting a filtration means;
• and
• the backflush device comprises an elongate outlet configured to provide a backflush fluid flow through the filter element such that the backflush fluid flow intersects the filter element along a line that is non-parallel with the one or more elongate supporting portions, wherein the spacing between the elongate outlet of the backflush device and the filter element is 15 mm or less.