Hot/cold water mixing device

Details Hot/cold water mixing device Hot/cold water mixing device

G - Physics

05

D

236/3

G05D 23/185 (2006.01) G05D 23/13 (2006.01)

Patent

CA 1272707

ABSTRACT OF THE DISCLOSURE A hot/cold water mixing device includes a hot water supply valve disposed in a hot water feed pipe for regulating the amount of hot water passing therethrough, a cold water supply valve disposed in a cold water feed pipe for regulating the amount of cold water passing therethrough, a water mixture pipe connected between the hot and cold water feed pipes and a water outlet, and a control mechanism for controlling an actuating mechanism to open and close the hot and cold water supply valves complementarily to each other. The control mechanism has a mechanism for storing a plurality of characteristics including, at least, a first characteristic having a relatively small gain with respect to the difference between a desired temperature for water discharged from the water outlet and the temperature of water in the water mixture pipe, and a second characteristic having a relatively large gain with respect to the difference, a characteristic selecting and maintaining mechanism for selecting and maintaining the second characteristic when the absolute value of the difference exceeds a relatively large value and for selecting and maintaining the first characteristic when the sign of the difference is inverted, and a mechanism for determining the speed at which the hot water supply valve and the cold water supply valve are opened and closed, according to the selected characteristic. The control mechanism controls the

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