Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver
Patent
1975-01-24
1976-02-10
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Responsive to accumulation of pumped liquid in receiver
417390, F04B 4900
Patent
active
039375960
ABSTRACT:
A liquid pump and control system for maintaining a predetermined level of liquid in a vessel comprising a liquid level sensing means, a variable displacement hydraulic pump, a control means connected to said liquid level sensing means and said variable hydraulic pump, a constant speed driving means connected to said variable hydraulic pump, a hydraulically actuated motor in fluid communication with said variable hydraulic pump and a liquid pump in fluid communication with said liquid vessel for evacuating fluid therefrom, said liquid pump connected and driven by said hydraulic motor. The liquid level sensing means within the liquid containing vessel determines the fluid level in the vessel, provides an electric signal to a variable displacement hydraulic pump which is driven by a constant speed electric motor. The variable volume output of the hydraulic pump is coupled to and drives the hydraulic motor at an RPM proportional to the pump volume. The hydraulic motor drives the fluid pump, the inlet of which is coupled in fluid communication with the vessel. Thus utilizing applicant's device the liquid pump will have a variable volume output to control the water level in a chamber such as a wet well, utilizing a constant speed electric drive.
REFERENCES:
patent: 2467398 (1949-04-01), Miller
patent: 3199793 (1965-03-01), Sabi
patent: 3393642 (1968-07-01), Kordim et al.
patent: 3587765 (1971-06-01), McFarland
patent: 3672793 (1972-06-01), Yowell
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