Abstract: A thermal food storage cabinet has a sealed box with a thermally insulated compartment, a freezer compartment and a refrigeration compartment, a compressor, a condenser, evaporator and thermal expansion valve. The thermally insulated compartment has a heat-conducting panel. The compressor, the evaporator and the thermal expansion valve are mounted in the thermal food storage cabinet to cool the freezer compartment and the refrigeration compartment. The condenser is mounted on the heat-conducting panel so heat dissipated by the condenser can flow into the thermally insulated compartment.

Abstract: A driving circuit of an AC fan motor has an AC to DC converter, a current detecting unit, a step-down divider, a motor driving unit, two windings each having many coils and a harmonic wave elimination unit. The AC to DC converter converts AC power to high voltage DC power. The motor driving unit is connected to the step-down divider to obtain low voltage DC power to operate. The two windings are directly connected to the AC to DC converter through the current wave detect unit to obtain the high voltage DC power. Therefore, the current wave detecting unit can response current changes of windings and then an operator can simulate present current wave of the windings to determine the present operating status of the AC fan motor.

Abstract: A method for combining heat conductive tubes and heat dissipating fins includes the steps of positioning heat conductive tubes, extending the heat conductive tubes through holes in a very first heat dissipating fin, placing solder rings around each of the heat conductive tubes and between the heat conductive tubes and the very first heat dissipating fin, repeating the heat conductive tube extending step and the solder ring placing step until the solder rings are placed between the heat conductive tubes and a very last heat dissipating fin and heating a combination of the heat conductive tubes, the heat dissipating fins and the solder rings to melt the solder rings so as to secure engagement between the heat conductive tubes and the heat dissipating fins.

Abstract: A cooling appliance for cooling hot beverages has a base, a heat conducting bar and an electric fan. The heat conducting bar is mounted securely in the base. The electric fan is attached to the base. The heat conducting bar extends into the hot beverages and transmits heat to the base. The electric fan blows air to cool the base. Therefore the cooling appliance can cool the hot beverage in a very short time.

Abstract: A negative ions generating circuit design with decreasing high frequency noise includes a power indication circuit, an oscillation circuit, an amplifying circuit and a radial frequency filtering circuit. The power indicating circuit, the oscillation circuit and the amplifying circuit are used for generating negative ions. The radial frequency filtering circuit has a capacitance to be utilized for limiting the high frequency in a coil so that the high frequency will not be amplified by through the transistor of the oscillation circuit. The coil creates an inductance to limit the high frequency so as to effectively eliminate the high frequency created by the oscillation circuit.

Abstract: A shaft sleeve of a DC brushless fan has a cylindrical body, an upper space, a lubricant cavity, a recess, a partition and a longitudinal outer edge. The upper space is formed in the top of the cylindrical body. The lubricant cavity is defined in the cylindrical body and communicates with the upper space. The recess is defined in the bottom. The partition is formed inside of the cylindrical body and between the lubricant cavity and the recess. The longitudinal outer edge is formed around the recess. When the longitudinal outer edge of the shaft sleeve is pressed into a through hole in a frame, a force is generated in the longitudinal outer edge to securely hold the longitudinal outer edge in the frame. Therefore, a strength of a joint between the shaft sleeve and the frame is increased.

Abstract: A DC brushless fan motor driving circuit has a Hall PWM signal generator, a speed signal generator, a PWM driver and a full-bridge switching circuit. The Hall PWM signal generator obtains a Hall sine wave signal from an external Hall sensor and converts the Hall sine wave signal to a varied Hall PWM signal. The speed signal generator is connected to an external PWM input signal to set speed of a fan motor and a low speed voltage to determine a present speed setting signal. The speed signal generator further obtains the varied Hall PWM signal to compare the present speed setting signal to generate a SPWM signal to the PWM driver. The PWM driver outputs a SPWM signal to the full-bridge switching circuit and then coil current is formed close to a sine wave signal to decrease the electromagnetic noise.

Abstract: A desk lamp with multi-function includes a lamp body, a negative ion generator, a thermostatic cup holder and an integrated power controller. The lamp body includes a lamp base, a lamp arm and a lamp shade. The negative ion generator is disposed inside the lamp body. The thermostatic cup holder is disposed inside the lamp base and has an exposed heat transmission pad. The integrated power controller is disposed inside the lamp base and has a plurality of power switch respectively and electrically connected to the lamp shade, the negative ion generator and the thermostatic cup holder to integrate the powers with a power plug.

Abstract: A fan device includes a casing having a recess defined in a first side thereof so as to receive a fan unit therein, and a hole defined through a second side of the casing. An outlet is defined in a side of the casing. The fan unit includes a first ring and a motor is located at a center of the first ring. A plurality of inner blades extend from an inner periphery of the first ring and a plurality of outer blades extend from an outer periphery and an underside of the first ring. The inner plates are connected to the motor. The fan device sucks air from both sides of the casing and the air flows out from the outlet smoothly.

Abstract: A pulse adjusting protective circuit includes a driving circuit, a running detecting circuit and a pulse trigger circuit. When the driving circuit cannot work normally, the running detecting circuit will output signals to make the pulse trigger circuit output pulse(s) for testing motor. The period of the pulse can be adjusted to control the current flowing during driving motor. The current flowing during testing motor is less than normal operation.

Abstract: A cooling appliance for cooling hot beverages has a base, a heat conducting bar and an electric fan. The heat conducting bar is mounted securely in the base. The electric fan is attached to the base. The heat conducting bar extends into the hot beverages and transmits heat to the base. The electric fan blows air to cool the base. Therefore the cooling appliance can cool the hot beverage in a very short time.

Abstract: A dehumidifying device has a hollow body. An air inlet and an air outlet are respectively defined in two opposed sides of the body. A heat exchanger and a blower are provided in an airflow passage which is formed between the air inlet and the air outlet. A water passage is provided under the heat exchanger and a reservoir is provided under the water passage so that water which is condensed by the present invention can be purified for drinking etc.

Abstract: A heat dissipating fan assembly includes a frame provided with multiple ventilation holes, a sleeve on top of a bottom face defining the receiving space and having a connection hole and two opposed retainers formed on a top peripheral edge of the sleeve, a bearing, a stator securely mounted around the sleeve and having a coil set mounted on a circuit board and a rotor having a hollow casing, multiple blades formed on an outer periphery of the hollow casing and a bearing shaft hole defined in a bottom face of the hollow casing to securely receive therein the bearing shaft, the bearing shaft hole having a mediate portion provided with a diameter larger than that of the bearing shaft such that extension of the bearing shaft into the bearing shaft hole reduces possibility of damage to the bearing shaft.

Abstract: A rotor for a cooling fan has a hollow hub having an open lower end. A permanent magnet is received in the hub. A rod is received in the hub and extends downwards. Multiple vanes are evenly formed around the periphery of the hollow hub and extend radially. Multiple notches are respectively defined at edges of the vanes and adjacent to the hollow hub. When the airflow is compressed by the rotation of the vanes, the airflow can be led to a desired direction via the notches. Whereby, the pressures between adjacent vanes are even thereby preventing the collision between the airflow and interior components of the cooling fan, so that the noise is avoided.

Abstract: A driving circuit of an AC fan motor has an AC to DC converter, a regulated voltage divider, a motor driving unit, two windings each having many coils and a harmonic wave suppression unit. The AC to DC converter converts AC power to high voltage DC power. Since the motor driving unit requires low voltage DC power, the motor driving unit is connected to the AC to DC converter through the regulated voltage divider. The two windings are directly connected to the AC to DC converter to obtain the high voltage DC power. Therefore, when the motor driving unit drives the windings, a large current will pass through the winding to increase rotation ration. Since each winding has many coils, the large current can be held in a suitable range to prevent the winding from being damaged by the large current.

Abstract: A balance adjusted fan mainly includes a hub, a shaft and a plurality of blades. The hub has a ring-wall and a top wall, and the shaft is connected to the top wall. The ring-wall has a plurality of socket holes that can be formed on the top edge, the bottom edge or the outside surface of the ring-wall. The blades are formed on the outside surface of the ring-wall. When the fan rotates in unbalance, at least a balance weight can be connected in one of the socket hole in an appropriate position that opposes to the heavier side of the hub to stabilize the rotation balance of the fan.

Abstract: A cooling fan with dual blade sets has an impeller formed by a rotatable hub, a stator assembly, and a shell. A plurality of mini blades and a plurality of guide blades are respectively formed on a bottom surface and an external surface of the rotatable hub. The impeller has a plurality of holes defined on the bottom surface being arranged in a circle adjacent to the mini blades. Therefore when the impeller rotates, the mini blades are able to drive out the heat in an inner space between the impeller and the shell through the holes to outside.

Abstract: A heat-dissipating fan for electronic equipment has a frame, a stator, an impeller, a top cover and an enlarged discharge port. The frame has a bottom, a sidewall and a volute. The sidewall is formed on the bottom and has an open front and a top surface that is either parallel to or diverges from the bottom of the frame toward the open front. The volute is defined inside the sidewall. The stator is mounted on the bottom in the frame. The impeller is mounted rotatably on the stator inside the frame. The top cover is mounted on the sidewall and has an inlet and an optional recessed segment. The enlarged discharge port reduces the back pressure on air passing through the volute.

Abstract: A fan device includes a casing having a recess defined in a first side thereof so as to receive a fan unit therein, and a hole defined through a second side of the casing. An outlet is defined in a side of the casing. The fan unit includes a first ring and a motor is located at a center of the first ring. A plurality of inner blades extend from an inner periphery of the first ring and a plurality of outer blades extend from an outer periphery and an underside of the first ring. The inner plates are connected to the motor. The fan device sucks air from both sides of the casing and the air flows out from the outlet smoothly.

Abstract: A fan device includes a base having a recess in which a fan unit is received. A hole is defined through a second side of the base and a first outlet is defined in an end of the base. The fan unit includes two rings and a motor is located at a center of the first ring. A plurality of inner blades extend from an inner periphery of the first ring and are connected to the motor. A plurality of outer blades connected between the two rings. The air flow is sucked and blown out by a larger volume so as to efficiently remove heat from CPU.