Method of and apparatus for controlling the flow rate of...

A - Human Necessities – 01 – G

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341/38.5

A01G 27/00 (2006.01) B05B 12/08 (2006.01) B05B 12/10 (2006.01) B05B 17/04 (2006.01)

Patent

CA 1288841

ABSTRACT OF THE DISCLOSURE A method of controlling the flow rate of viscous fluid for feeding the fluid under pressure by an ON/OFF type spray gun with a constant-capacity type pump which comprises the steps of detecting the temperature and the pressure of the viscous fluid in a hose for coupling the pump with the gun when the fluid is not exhausted from the gun in an OFF mode, calculating viscous fluid supplying pressure to obtain a target set flow rate from preset temperature-supplying pressure characteristic data at the detected temperature, comparing the detected pressure of the fluid with the calculated supplying pressure to control the exhausting pressure of the pump so that the detected pressure coincides with the supplying pressure, and operating the pump at a constant speed to provide the target set flow rate. An apparatus for controlling the flow rate of viscous fluid for executing the above method is also provided. Thus, the method can always feed the viscous fluid at a constant flow rate even if the viscosity of the fluid varies due to temperature change and feed the fluid at a stable constant flow rate from immediately after the start of exhausting the fluid from a spray gun.

519244

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