Fluid filtration system with helical filter element

摘要

The invention provides a filter element for a fluid filtration system, particularly for piston cooling jets used in reciprocating piston engines. The filter element is formed from a length of filter material arranged helically in a substantially tubular form. By applying a torque the length of filter material is resiliently expandable to a fitting position in which opposing longitudinal edges of the length are spaced apart from each other. The filter element is then fitted over a fluid chamber of the filtration system and allowed to retract to a rest position in which the opposing longitudinal edges are close or in contact. In the rest position the filter element surrounds the fluid chamber and covers a fluid inlet of the fluid chamber. The filter element of the invention can be used to apply local filtration, and can be readily removed for cleaning or replacement by reversing the fitting process.