Self-gush-cleaning filter device
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United States of America Patent
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-
Mar 7, 2000
Grant Date -
N/A
app pub date -
Feb 3, 1998
filing date -
Aug 4, 1995
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A self-gush-cleaning filter device comprises a filter casing (1) provided with an inlet passage (a) and an outlet passage (d), a screen (11) disposed within the filter casing (1) so as to slide along the inner surface of the filter casing (1) in the flowing direction of a fluid, a foreign matter ejecting opening (15) being formed between the screen (11) and the inlet passage (a). A drive shaft (4) for driving the screen (11), a screen driving unit (3) for driving the drive shaft (4) so as to move the screen (11) quickly in a downstream direction in which the fluid flows from the inlet passage (a) toward the outlet passage (d) and to move the screen slowly in an upstream direction. An outlet shutoff valve (14) is disposed in the outlet passage (d) of the filter casing (1). The screen driving unit (3) is actuated after closing the outlet shutoff valve (14) to move the screen (11). When the screen (11) is moved quickly in the downstream direction, the fluid gushes from the downstream side through the screen (11) into the upstream side, and the foreign matters deposited on the screen (11) are removed from the screen (11) by the force of the gushing fluid.
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