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AssigneeParker-Hannifin Corporation
InventorsMarko Kangasniemi, Tuomo Koivula
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The invention relates to a method for cleaning a filter element (9) located in a filtering chamber (10, 11) and to a filter implementing the method. The filter includes an inlet (4) leading to the inlet side (10) of the filtering chamber, an outlet (6) starting from the outlet side (11) of the chamber, and a flow passage (13), which connects the chamber inlet side preferably to atmospheric pressure and by means of which a pressure difference can be generated between the different sides of the filter element in order to produce a flow impulse detaching solid matter accumulated on the element. In accordance with the invention, the inlet side (10) of the filtering chamber is connected in a first step to a confined buffer chamber (14) under lower pressure, the pressure equalisation between the chambers producing a flow impulse cleaning the filter element (9), after which the buffer chamber can be connected to atmospheric pressure. Such two-step pressure drop during cleaning of the filter element allows use of the elements in high-pressure hydraulic systems without exposing the element to risk of damage.
A method for cleaning a filter element (9) located in a filtering chamber, in which, after interruption of the filtering flow from the inlet side (10) of the filtering chamber through the element to the outlet side (11) of the chamber, the chamber inlet side is connected with a lower pressure in order to generate a pressure difference instantaneously between the different sides of the element and in order to produce a flow impulse detaching solid matter accumulated on the element surface, wherein the filtering chamber is connected with a confined buffer chamber (14) under lower pressure than the filtering chamber so that pressure equalisation between the filtering chamber inlet side (10) and the buffer chamber generates a pressure difference in the filtering chamber and a flow impulse between the different sides of the filter element (9).
A filter comprising a filtering chamber, a filter element (9) located in the filtering chamber and dividing the chamber into an inlet and outlet side (10, 11), an inlet (4) for flow to be filtered on the chamber inlet side, an outlet (6) for filtered flow on the chamber outlet side, and a flow passage (13) connecting the chamber inlet side to lower pressure during cleaning of the element in order to generate a pressure difference instantaneously between the different sides of the element and to produce a flow impulse detaching solid matter accumulated on the element surface, wherein said filter includes a confined buffer chamber (14), which can be brought to a pressure below the pressure prevailing in said filtering chamber (10, 11) and which can be connected through said flow passage (13) to the filtering chamber for pressure equalisation between the filtering chamber inlet side (10) and the buffer chamber and for generation of a pressure difference between the different sides of the filter element (9).
Dependencies are inferred from the claim text.