F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
F16K 31/70 (2006.01) G05D 23/13 (2006.01)
Patent
CA 2128725
ABSTRACT OF THE DISCLOSURE The present invention provides a combination faucet which compensates for a temperature deviation of an actual temperature of water mixture from a target temperature by pressing a movable valve disc (70) for determining a mixing ratio of hot water to cold water with a temperature-sensitive coil spring (80). The temperature-sensitive coil spring (80) is composed of such a material that varies a spring constant of the temperature-sensitive coil spring (80) according to a temperature change. When the temperature control only by the temperature-sensitive coil spring (80) can not sufficiently compensate for the temperature deviation, feed-back control is executed for completely eliminating the temperature deviation. A control gain K of the feed-back control is determined according to a variation of the spring constant of the temperature-sensitive coil spring (80) for preventing an undesirable hunting. When the temperature deviation is eliminated by the feed-back control, the relationship between a target temperature and a current pre-load adjustment quantity is stored. The stored relationship is used to determine a pre-load adjustment quantity when the same target temperature is set. At a start of spouting water mixture or on a variation of the target temperature, the feed-back control is not executed until the temperature deviation becomes smaller than a threshold value TR1. This effectively prevents hot water from abruptly spouting after completion of spouting dead water.
Eki Toshio
Ohtsuka Toshiharu
Dennison Associates
Toto Ltd.
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