Flow rate control system in fluid supply and drain apparatus

Details Flow rate control system in fluid supply and drain apparatus Flow rate control system in fluid supply and drain apparatus

1986-10-24

1988-01-19

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

With condition responsive control of pump fluid valve

417295, F04B 4900

Patent

active

047202459

ABSTRACT:
The present invention relates to a flow rate control system in an apparatus for supplying and draining fluid such as air and water, etc. and particularly in a fluid suply and drain apparatus comprising a motor for driving fluid flowing apparatus such as a fan and a flow rate control device such as a damper which is capable of shielding the flow path. The number of the rotations of motor is controlled step by step in accordance with the flow rate of fluid flowing through a flowing path on the occasion of operating the motor with the variable frequency power supply of which the output frequency changes depending on a command request of the fluid flowing apparatus as a load, also controls the flow rate control device in accordance with deviation between the command request from the load and a staircase control input to the variable frequency power supply even when the flow rate changes minutely at each step. Fine control of the desired flow rate is achieved by adjusting the number of rotations of motor and the amount of the opening angle of the flow rate control device.

REFERENCES:
patent: 3007414 (1961-11-01), Long et al.
patent: 4181099 (1980-01-01), Binstock
patent: 4225289 (1980-09-01), Borhoff
patent: 4566289 (1986-01-01), Iizuka et al.

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