Circulating pump unit

Details Circulating pump unit Circulating pump unit

1981-06-11

1984-03-13

Look, Edward K.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

F04B 4906

Patent

active

044364865

ABSTRACT:
A circulating pump unit comprising a pump and a motor for heating and service water installations, in which the motor is settable to at least two different speeds of rotation by means of a rotation speed switch. According to the invention the motor (1) couples automatically and independently of the operational speed (n) set on the rotation speed switch (3), after switching off or switching on of the unit by means of a start-up switch (5) overriding the rotation speed switch to the rotation speed (n3) with maximum start-up moment (M3) and starts at this rotation speed and after a pre-determined time switches over to the operational rotation speed set on the rotation speed switch. Thereby the circulating pump unit will give a reliable start of the pump also after a standstill for a long time.

REFERENCES:
patent: 1752892 (1930-04-01), Cumberland
patent: 1920749 (1933-08-01), Hutt
patent: 1952299 (1934-03-01), Valkenburg
patent: 3069068 (1962-12-01), Hansen
patent: 4030009 (1977-06-01), Halsted

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