| 摘要 |
A combination type humidifier with a heater and an ultrasonic vibrator has a system for preventing the ultrasonic vibrator from being thermally damaged due to a heat produced by the heater. First, a current humidity of a space, a water temperature of a humidifying chamber and a target humidity set by a user are detected. When the current humidity is higher than the target humidity, a fan motor begins to operate for a rapid heat loss. Otherwise, when the target humidity is higher than the current humidity, an error message concerning the setting of the target humidity is displayed and the fan motor is driven for a predetermined time (figure 3a). The heater is controlled so that the water temperature of the humidifying chamber is kept below a limit temperature that is set for protecting the ultrasonic vibrator, while the ultrasonic vibrator and the heater are simultaneously operated by a user's selection. Under these conditions, when a user selects a high vapour-producing "turbo" mode, the turbo mode is changed to a mode in which the quantity of produced vapour is less than in the turbo mode, and then the ultrasonic vibrator is operated (figures 3b and 3c). Alternatively, when the heater is not operated, and a low mode of vapour production is selected by the user, the mode is switched up to a higher vapour-producing mode (figure 3b). |
