Enclosed sump pump

Details Enclosed sump pump Enclosed sump pump

1976-08-09

1978-05-02

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417 17, 417 38, 417 63, 417374, F04B 4106

Patent

active

040872041

ABSTRACT:
All of the components of a sump pump apparatus necessary to be in the sump are enclosed in a common case. In one embodiment, this case is of plastic and holds the motor means, the pump impeller and at least part of the water level sensors. The motor means is in a bell holding trapped air so that the water cannot reach the motor means. In one such embodiment the motor means is a single D.C. motor and in another embodiment it consists of a D.C. motor coupled by a one-way clutch to an A.C. motor which in turn is connected to the pump impeller. In each of these two embodiments, the water level sensor includes a tube having an open end in the bell to sample the air pressure in the bell and an end externally of the sump connected to a pressure actuated switch which turns on the motor means at a particular air pressure above ambient. Also within the bell is a float operated switch serving as a back-up to the air actuated switch. Using two motors, as mentioned above, the A.C. motor is turned on by an air pressure actuator at a lower air pressure above ambient than is the D.C. motor.
In another embodiment the case is cylindrical and elongated in the direction of its axis. The lower end of the case extends into the sump while the upper end stands above the sump. On the upper end are two motors, two pumps and the related controls. The intake lines for the pump extend down within the case into the sump, as do air pressure sampling tubes. One motor is turned on by a pressure actuated switch at a relatively low pressure above ambient while the other motor is turned on by a pressure actuated switch at a comparatively higher pressure over ambient.

REFERENCES:
patent: 1747357 (1930-02-01), Frenier
patent: 2281626 (1942-05-01), Smith
patent: 2756680 (1954-07-01), Rutschi
patent: 2902205 (1959-09-01), Parker
patent: 2918016 (1959-12-01), Olson
patent: 2939399 (1960-06-01), Rutschi
patent: 3264999 (1966-08-01), Tutthill
patent: 3656866 (1972-04-01), Hine, Jr. et al.
patent: 3726606 (1973-04-01), Peters
patent: 3941012 (1976-03-01), Mayer

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