Submersible pumps

Details Submersible pumps Submersible pumps

1982-03-29

1984-11-27

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

417 44, F04B 4902, F04B 4906

Patent

active

044848625

ABSTRACT:
An apparatus for controlling the operation of a pump, especially a submersible pump, and particularly for controlling a water level in connection with cellar drainage pumps, comprises at least one level detector using the principle of acoustic impedance for detecting the presence or absence of liquid to be pumped, said level detector being electrically connected to a control circuit controlling a switching device for the pump.

REFERENCES:
patent: 1913557 (1933-06-01), Millar
patent: 2975347 (1961-03-01), Schaeffer
patent: 2990543 (1961-06-01), Rod
patent: 2995347 (1961-08-01), Rich
patent: 3825025 (1974-07-01), Samuel
patent: 3829241 (1974-08-01), Emeny
patent: 3889523 (1975-06-01), Nolte
patent: 4019072 (1977-04-01), Mifune
patent: 4176524 (1979-12-01), Kamiyama
patent: 4182363 (1980-01-01), Fuller
patent: 4193010 (1980-03-01), Kompanek

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