Automatic pneumatic pump including a tank with inlet and outlet and a pump connected to the inlet
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United States of America Patent
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May 12, 1998
Grant Date -
N/A
app pub date -
Dec 24, 1996
filing date -
May 13, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An automatic pneumatic pump preferably used with a waste water disposal system is disclosed. The pump forcibly introduces sludge-laden liquid into a tank (30) and in turn feeds the liquid to a filter unit (F) for filtering off the sludge. The pump has one air pressure pipe (61) and two air exhaust pipes (62, 63) provided to the upper portion of the tank (30). The air pipes (61 to 63) include their solenoid valves (71 to 73) which are selectively opened in accordance with the liquid level inside the tank (30). An air compressor (C) is mounted to the air pressure pipe (61) and selectively operated during a time when the liquid level inside the tank (30) reduces from a top level to a bottom level (S.sub.1). A vacuum pump (P.sub.2) is mounted to the second air exhaust pipe (63) and selectively operated during a time when the liquid level inside the tank (30) increases from the bottom level (S1) to the top level (S.sub.2). A microcomputer controls the solenoid valves, air compressor, vacuum pump and liquid pump in response to signals output from liquid level and pressure sensing units.
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