Anti-flooding sewage grinder pump liquid level control system in separately mounted canister
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United States of America Patent
Stats
-
Apr 24, 1990
Grant Date -
N/A
app pub date -
Sep 25, 1989
filing date -
Sep 25, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An anti-flooding sewage grinder pump liquid level control system in a separately mounted canister is provided for installation within and controlling operation of a sewage grinder pump installed within a sewage collection tank. Within the control canister, pneumatically operated electric control switches for controlling on/off operation of the sewage grinder pump and for redundant pump down of alarm high level flooding conditions, are provided. The control switches are mounted within one or more diving bell-type containment vessels for preventing flooding of the electric control switches in case of surge overloads of liquid sewage or failure of the primary on/off pneumatic/electrical control switch. In the event of flooding, the containment vessel will pressurize air in the top of the containment vessel and will actuate the alarm level control switch. The alarm level control switch is wired to provide redundant excitation to the sewage grinder pump motor. As a consequence, alarm liquid level conditions are pumped down to just above the normal operating range of the sewage grinder pump cyclically as long as the condition continues. The pressurized air trapped within the diving bell-type containment vessel also will prevent rising of the flood waters within the containment vessel so as to protect the control switches from being flooded. As a result, the system will continue to operate even during alarm flood conditions to pump down the collection tank cyclically without requiring separate service measures to do so. After pump down of the contents of the collection tank to below alarm levels, the system automatically will return to its normal on/off control operating mode without requiring service or maintenance of any kind. During any flooding condition while the alarm level control switch is on, an alarm light is continuously lighted and a user option alarm sound signal is sounded even after the pump down to below the alarm high level occurs.
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