Abstract: A protective circuit for a supersonic humidifier includes a compare circuit to obtain working voltage at two terminals of an ultrasonic vibrating member to decide whether the humidifier is to be continued to operate or stopped so as to protect it from burning up. The protective circuit does not utilize a vibration needle, a float, a magnetic switch and a HALL IC used in conventional humidifiers.

Abstract: A fan blade includes a shaft base and plural wind guiders formed integral with the shaft base. The wind guiders are fixed spaced apart equidistantly on the peripheral edge of the shaft base. Each wind guider is formed integral with one or more than one netted portions, and each netted portion is fixed with non-woven cloth having sticky material fixed thereon. The sticky surface of the non-woven cloth is applied with activated carbon, or fragrant material able to give out fragrance or material able to remove bad smell in air. The fan blade has functions of filtering dust in air and giving out fragrance.

Abstract: A liquid heating device includes a heater having its front and rear end respectively connected with two output terminals of a control circuit. When the control circuit is started, the heater will immediately generate high temperature to let the liquid inside heated up fast to a proper temperature, or boiled or converted into vapor, conforming to practicability.

Abstract: A coffee maker includes a body provided with a water storing space and a handle, and a heater positioned under the water storing space. The heater is made of an insulating plate and an electrically heating film formed on a lower surface of the insulating plate. Then the heat generated by the electrically heating film heats up the water in the water storing space of the body for making coffee.

Abstract: A liquid heating device includes a pump for pumping liquid, and a helical heating tube receiving liquid sent by the pump. The two ends of the helical heating tube are connected with two terminals of electric power, and when a control system is started, the helical heating tube is heated up to produce high heat to heat up the liquid therein to a proper temperature, to boil it up or change it into vapor for practical use.

Abstract: An electric heater includes a metal plate, an insulating plate, and an electrothermal film thermally plated on a lower surface of the insulating plate. The electrothermal film generates high temperature, which is then transmitted through the insulating plate to the metal plate. Then the metal plate is heated up to high temperature for use. Then the electric heater is effective, quite safe to use, and adaptable for various electric appliances.

Abstract: An electric heater with a sensor for preventing no-water heating includes a heating plate and/or a metal plate fixed on the heating plate, a heating film electro-plated on a lower surface of the heating plate, and a water level probe, or a sensing electrode, or a water level sensor and a temperature fuse fixed with the heating plate. The water level probe, the sensing electrode or the water level sensor produces alteration of electric potential in case of the water level becoming very low, triggering a switch of an A/D amplifying circuit automatically cutting off power of the heating film.

Abstract: A water level control device for a humidifier includes a housing, a control electric circuit in the housing, and a mist produce, a water tank, a mist chamber on the water tank, a water level detector and a float in the water tank. The float has a magnet inside, and the water level detector has a Hall Effect Digital switch, which has two faces to activate with the magnet of the float when the float rises or descends together with the water level in the water tank. Then the Hall switch is turned on or off to inform the water level high or low, protecting the humidifier from damage caused in case of no water in the water tank.

Abstract: A vaporizer includes a pump for pumping liquid stored in a liquid store tank, a helical vaporizing tube, and a control system connected to two ends of the vaporizing tube for functioning to make the vaporizing tube produce high temperature so as to heat up swiftly liquid flowing through the helical vaporizing tube and finally vaporize liquid at the outlet end of the vaporizing tube, with the liquid in the helical vaporizing tube never reversely flowing back to the pump owing to low temperature of liquid at the inlet end of the helical vaporizing tube.

Abstract: A device for detecting the rotating speed of a fan motor includes a motor and a gear case fixed on the front side of the motor. Plural gears engaging with one another are provided in the gear case and one of them is embedded with a permanent magnet and further a magnetic inductive element is also installed inside the gear case to cooperate with the permanent magnet for operating together to detect the rotating speed of the motor.

Abstract: A liquid heating device includes a pump for pumping liquid, and a helical heating tube receiving liquid sent by the pump. The two ends of the helical heating tube are connected with two terminals of electric power, and when a control system is started, the helical heating tube is heated up to produce high heat to heat up the liquid therein to a proper temperature, to boil it up or change it into vapor for practical use.

Abstract: A vaporizer includes a pump for pumping liquid stored in a liquid store tank, a helical vaporizing tube, and a control system connected to two ends of the vaporizing tube for functioning to make the vaporizing tube produce high temperature so as to heat up swiftly liquid flowing through the helical vaporizing tube and finally vaporize liquid at the outlet end of the vaporizing tube, with the liquid in the helical vaporizing tube never reversely flowing back to the pump owing to low temperature of liquid at the inlet end of the helical vaporizing tube.

Abstract: An electric fan capable to rotate for 360 degrees includes a control device consisting of a left and a right shell combined together. The shells have a L-shaped steel plate inside to fix a motor and a speed-reducing device. The speed-reducing device has its spindle fitted with the fixed shaft of a clutch having bead hole for receiving two steel beads and a spring. A shaft sleeve has bead grooves for receiving two aforesaid steel beads and firmly fitted in a copper sleeve by a bolt screwing through a bolthole and resting against a concave groove of the stand post. The shells further have a shaft groove for receiving the upper half portion of the stand post, thus, the upper half portion is actuated by the control device to rotate with an angle from 0 degree to 360 degrees.

Abstract: An electric fan capable to rotate for 360 degrees includes a control device consisting of a left and a right shell combined together. The shells have a L-shaped steel plate inside to fix a motor and a speed-reducing device. The speed-reducing device has its spindle fitted with the fixed shaft of a clutch having bead hole for receiving two steel beads and a spring. A shaft sleeve has bead grooves for receiving two aforesaid steel beads and firmly fitted in a copper sleeve by a bolt screwing through a bolthole and resting against a concave groove of the stand post. The shells further have a shaft groove for receiving the upper half portion of the stand post, thus, the upper half portion is actuated by the control device to rotate with an angle from 0 degree to 360 degrees.

Abstract: A device for detecting the rotating speed of a fan motor includes a motor and a gear case fixed on the front side of the motor. Plural gears engaging with one another are provided in the gear case and one of them is embedded with a permanent magnet and further a magnetic inductive element is also installed inside the gear case to cooperate with the permanent magnet for operating together to detect the rotating speed of the motor.

Abstract: A fan head-swinging device includes a speed reducer and a DC motor. The speed reducer consists of plural gears engaging with each other. The DC motor is fixed behind a housing of a fan, having a spindle fixed on with a small gear engaging with one of the plural gears of the speed reducer. So the shaft of that gear may rotate with a very slow speed suitable to the fan head to swing right and left for a proper angle by controlling the DC motor.

Abstract: A fan head-swinging device includes a speed reducer and a DC motor. The speed reducer consists of plural gears engaging with each other. The DC motor is fixed behind a housing of a fan, having a spindle fixed on with a small gear engaging with one of the plural gears of the speed reducer. So the shaft of that gear may rotate with a very slow speed suitable to the fan head to swing right and left for a proper angle by controlling the DC motor.

Abstract: A protective circuit for a supersonic humidifier includes a compare circuit to obtain working voltage at two terminals of an oscillator to decide whether the humidifier is to be continued to operate or stopped so as to protect it from burning up. The protective circuit does not utilize a vibration needle, a float, a magnetic switch and a HALL IC used in conventional humidifiers.

Abstract: A humidifier includes a float positioned at a water outlet of a water tank, and a body containing a water level sensor functioning with the float rising and falling with the level of the water in a water chamber in the body to drive the water level sensor in case of the water level falling to the lowest to turn off the humidifier. Then the water tank is simplified in its structure and making the humidifier safe to use.