Variable speed pump system with a hydropneumatic buffer/pressure

Details Variable speed pump system with a hydropneumatic buffer/pressure Variable speed pump system with a hydropneumatic buffer/pressure

1995-04-25

1998-01-13

Thorpe, Timothy

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

417 12, 417 442, 417 20, F04B 4900

Patent

active

057072116

ABSTRACT:
A fluid pressure control system which is usable to control pressure in a fluid distribution system includes a variable speed drive coupled to a pump. A hydropneumatic tank is coupled to the distribution system. In normal operation, the variable speed drive actuates the pump so as to maintain pressure in the system. Under low flow conditions, a control unit, using the variable speed drive energizes the pump so as to pump fluid into and pressurize the hydropneumatic tank. The control unit then shuts off the pump. Pressure is maintained in the system, until a predetermined, lower, set point is reached as a result of pressure in the hydropneumatic tank.

REFERENCES:
patent: 3639081 (1972-02-01), Gray et al.
patent: 3775025 (1973-11-01), Maher, Jr. et al.
patent: 4259038 (1981-03-01), Jorgensen et al.
patent: 4281968 (1981-08-01), Akers
patent: 4290735 (1981-09-01), Sulko
patent: 5253982 (1993-10-01), Niemiec et al.
patent: 5381667 (1995-01-01), Worley et al.

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