| 摘要 |
The invention relates to a continuous-action filtering method, a filtering apparatus, as well as to the use of the discussed apparatus as an automatic filter in the fuel or lubrication system of an engine. According to the invention, the apparatus comprises three filtering units (2, 5), having a common inlet channel (7) for a flow to be filtered, a common outlet channel for a filtered flow, as well as a common valve element (9) provided with flow connections (10) for controlling the flow in such a manner that the filtering units are in operation one at a time. An essential feature in the operation of the valve element (9) is its ability to rotate around its axis and, furthermore, its ability to move between two different positions, the two filtering units (2) being operable alternately by rotating the valve element and the third filtering unit (5) being operable by moving the valve. The valve element is constituted e.g. by a cylindrical, axially movable spindle (9), which is also rotatable around its axis. In an automatic filter, the two filtering units (2) can be used for a normal filtering process, wherein, with one of the units in operation at a given time, the other is subjected to a backflush, and the third unit (5) is set in operation as said two units are being serviced.
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