Patent ID: 8317110
Filing Date: 2012-11-27
Classification: G05D,Y10T

Abstract:
1. A water-and-hot-water mixing device comprising: a mixing valve which includes a valve element which is movably arranged in the mixing valve and is configured to regulate openings of respective inflow ports for hot water and water which are supplied to the mixing valve by way of predetermined flow passages corresponding to a position of the valve element in the moving direction of the valve element, and is configured to discharge mixed water made of the hot water and the water obtained by mixing the hot water and the water flown into the mixing valve from the inflow ports; a temperature setting operation part which is configured to set a predetermined temperature which is a target value with respect to a temperature of the mixed water; a temperature sensor which is configured to detect a temperature of the mixed water flown out from the mixing valve; a supply-hot-water temperature sensor which is configured to detect a temperature of the hot water supplied to the mixing valve; and a controller which is configured to perform a feedback control for controlling the mixing valve such that mixed water of the predetermined temperature is obtained as the mixed water by outputting a control signal for moving the valve element with respect to the mixing valve based on the predetermined temperature and a temperature of the mixed water detected by the temperature sensor, wherein the controller is configured to start the feedback control when the controller determines that a change amount of the temperature of the hot water per unit time detected by a hot-water supply temperature sensor is not more than a fixed value and the temperature of the hot water detected by the hot-water supply temperature sensor is not lower than the predetermined temperature.