Patent ID: 11872507
Assignee: BOLLFILTER NORDIC APS
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 0:
1. A filter candle for mounting in a backflush filter housing, the filter candle comprising:
a cylindrical filter wall which encloses an interior of the filter candle and which is formed by a filter medium through which fluid to be filtered may flow from the interior to an outside of the filter candle, the cylindrical filter wall having an inner diameter;
a first end and a second end of which at least one is open for fluid flow to the interior of the filter candle and a central axis extending between the first end and the second end;
a flushing element arranged in the interior of the filter candle and being rotatable about the central axis, the flushing element being divided into a flushing section provided with at least one flushing port for backflushing part of the cylindrical filter wall and a turbine section provided with a turbine for rotating the flushing element, the flushing section having a first end and a second end and being formed as a hollow shaft tapering from the first end to the second end, the at least one flushing port being provided in at least one flushing rib arranged on the hollow shaft and extending from the first to the second end of the flushing section, the turbine section having a first end and a second end and being formed as a hollow shaft tapering from the first end to the second end and the turbine being formed by turbine blades arranged on the outside of the hollow shaft of the turbine section, the first end of the flushing section being connected to the first end of the turbine section at a transition position, wherein
an outside of the flushing element forms a cylindrical restriction at the transition position for, during a backflushing operation, at least substantially restricting fluid flow from the flushing section to the turbine section between the cylindrical restriction and an inside of the cylindrical filter wall, and
the cylindrical restriction has an outer diameter being at least 85 percent of the inner diameter of the cylindrical filter wall.