Method and apparatus for liquid supply

Details Method and apparatus for liquid supply Method and apparatus for liquid supply

1978-04-26

1979-12-18

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

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

417 12, 417 36, 417 53, F04B 4106

Patent

active

041792424

ABSTRACT:
A method and an apparatus for liquid supply use a pressure tank and a plurality of pumps. When the pressure or liquid quantity in the pressure tank has decreased below a predetermined level, a preceding or regular pump starts. When the demand is too large for this pump, another pump in standby position starts, too. The regular pump continues running for a predetermined period of time after the start, even if the pressure or liquid quantity in the pressure tank has returned to a predetermined level, whereas the standby comes to a stop upon such recovery. In this manner the frequency of starting the pumps is minimized so as to avoid overheating of pump-driving motors and reduce the power consumption.

REFERENCES:
patent: 1819774 (1931-08-01), Durdin, Jr.
patent: 2628995 (1953-02-01), Shanklin
patent: 3148622 (1964-09-01), LeVan et al.

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