Pump with speed controller responsive to temperature

Details Pump with speed controller responsive to temperature Pump with speed controller responsive to temperature

1991-03-12

1992-10-27

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Responsive to pump or pump fluid temperature

417 45, F04D 1500

Patent

active

051584360

ABSTRACT:
The pump unit is provided, in particular for heating and cooling installations. The speed of the pump unit may be altered by changing the operating frequency of a frequency converter feeding the electric motor and which forms a structural unit with the pump unit. As soon as the pump unit has reached a parameter characterizing the thermal overload of the same, the frequency converter is controlled in a manner so as to reduce the speed, the reduced speed n' being greater or equal to half the normal speed n.

REFERENCES:
patent: 2518597 (1950-08-01), Brooks
patent: 3232519 (1966-02-01), Long
patent: 5066197 (1991-11-01), Champagne
Chem.-Ing.-Tech. 60(1988)Nr. 1,S 43-46.

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