Abstract: An air flow guide device for mounting on a heat dispensing fan includes a U-shaped frame and each of the three sides of the frame has a curve outer surface. A plate is connected between two distal ends of the frame and extends inclinedly from a top edge of the two distal ends of the frame, and a slot is defined between the two distal ends of the frame and the plate. Air flow smoothly flows over the curve smooth surfaces and is sucked by the fan. The plate prevents the exhausted air from being sucked by the fan.

Abstract: A cooling fan dust guard has provided on the inner side of fan blades ribs and recess that mutually form an overcut height difference with a bushing opening so to prevent the airflow carrying dust an easy ingression and even keep off the flying dust from entering into the spindle.

Abstract: A solar fan is disclosed. The solar fan includes a main body having an electric fan inside, and a plurality of solar cell arrays pivotally connected to the main body. Each of the solar cell arrays is pivotal between an outspread position and a folded position relative to the main body. A retainer is provided for holding the solar cell array in the outspread position. In addition, the solar cell arrays are electrically connected to the electric fan so as to supply power to the fan when being in sunlight.

Abstract: A blade for a cooling fan is formed on an outer periphery of a rotor of the cooling fan and is curved. The blade has a convex outer surface and a concave inner surface. A curved angle of the blade between a line through the center of the rotor and a root of the convex outer surface and a line through the root and a tip of the convex outer surface is between 30° to 40°. A plane surface is formed on the concave inner surface and at a distal end of the blade. A first cutout is defined at a bottom side and a proximate end of the blade. A second cutout is defined at the upper side and the distal end of the blade.

Abstract: A cooling fan has a housing. A stator is securely mounted in the housing and has a coil, an upper pole sheet and a lower pole sheet coaxially provided at a top and a bottom of the coil respectively. A circuit board is provided beneath the lower pole sheet. An oil-retaining bearing is mounted in the stator. A rotator is received in the housing and has a cap covering the stator. A spindle is formed at the center of the cap and inserted through the oil-retaining bearing. A dustproof disk is provided between the circuit board and the lower pole sheet and is received in the cap of the rotator. A gap between the circuit board and the cap is sealed by the dustproof disk, and dust will not enter into the rotator to block the oil-retaining bearing.

Abstract: A cooling fan has a housing with a chamber defined therein. The housing has a seat provided in the chamber, a sleeve made of non-magnetized material and formed on the seat, a self-lubricating bearing received in the sleeve, a magnetic ring provided at a top of the sleeve, and lubricant received between the bearing and the magnetic ring. A circuit board is provided on the seat and outside the sleeve. A coil is provided on the circuit board and outside the sleeve. A rotor is rotatably mounted on the sleeve. The rotor has a hollow body covering the coil and the circuit board. A spindle is formed at a center of the hollow body and extends through the magnetic ring and in the bearing. A gap is defined between the magnetic ring and the spindle. Magnetic liquid is received in the gap for preventing the lubricant from escaping.

Abstract: A bearing assembly for a heat dissipation fan includes a bearing and a cap. The bearing has multiple grooves peripherally defined in the cylindrical body and a room defined in the body to communicate with the through hole in the center of the body. The cap is securely mounted on top of the bearing so that lubricant is able to be stopped from further movement away from the room.

Abstract: A cooling fan dust guard has provided on the inner side of fan blades multiples of fins at equal distance from one another around the spindle to create disturbance as the fan blades rotate to outwardly expel the airflow so to prevent the airflow carrying dust an easy ingression of the dust into the spindle and help cool down the stator assembly.

Abstract: A cooling fan dust structure has provided on the end of the fan blade hood a recess that mutually forms an overcut height difference with a flange protruding from the peripheral of a motor base so to prevent the airflow carrying dust an easy ingression and even keep off the flying dust from entering into the spindle as the fan blade unit rotates.

Abstract: A heat dissipation fan has a casing, a stator, a lubricating bushing and a fan. The stator is secured to the casing with a sleeve. The lubricating bushing has lubricant contained therein and is mounted in the sleeve. The fan is rotatably mounted in the casing and has a permanent magnet to be a rotor. A shaft extends from the fan and through a passage defined through the lubricating bushing. A locking disk is securely mounted on the shaft to hold the lubricating bushing. An oil guide is arranged on the lubricating bushing. Accordingly, the air in the cavity can be released from the oil guide during the assembly of the dissipation fan. The oil guide can keep oil from flowing out of the sleeve and drying out the lubricating bushing. The useful life of the dissipation fan is prolonged.

Abstract: A blade for a cooling fan is formed on an outer periphery of a rotor of the cooling fan and is curved. The blade has a convex outer surface and a concave inner surface. A curved angle of the blade between a line through the center of the rotor and a root of the convex outer surface and a line through the root and a tip of the convex outer surface is between 30° to 40°. A plane surface is formed on the concave inner surface and at a distal end of the blade. A first cutout is defined at a bottom side and a proximate end of the blade. A second cutout is defined at the upper side and the distal end of the blade.

Abstract: A cooling fan has a housing. A stator is securely mounted in the housing and has a coil, an upper pole sheet and a lower pole sheet coaxially provided at a top and a bottom of the coil respectively. A circuit board is provided beneath the lower pole sheet. An oil-retaining bearing is mounted in the stator. A rotator is received in the housing and has a cap covering the stator. A spindle is formed at the center of the cap and inserted through the oil-retaining bearing. A dustproof disk is provided between the circuit board and the lower pole sheet and is received in the cap of the rotator. A gap between the circuit board and the cap is sealed by the dustproof disk, and dust will not enter into the rotator to block the oil-retaining bearing.

Abstract: A control circuit for a brushless motor has a power conversion unit having a rectifier connected to a power source to convert input AC power to DC power and a filter having an output terminal connected to coils of the motor to provide converted DC power to the coils, a Hall element to detect phase changes in the coils of the motor and then output a signal, wherein the Hall element has an input terminal connected to the power conversion unit; and a driver IC having an input terminal connected to the Hall element for receiving the output signal from the Hall element and output terminals respectively connected to the coils to control operation of the coils.

Abstract: A heat dissipation fan has a casing, two fans and multiple stationary blades. The fans are co-axially rotatably mounted in the casing. Multiple rotating blades are arranged around the outer periphery of each fan. The stationary blades are secured in the casing and between the rotating blades of the two fans. The angle of the rotating blades on both of the fans is the same. The angle of the stationary blades is perpendicular to that of the passing rotating blades. Accordingly, the airflow generated by the dissipation fan will be enhanced with the multiple layers of rotating blades. The stationary blades reverse the direction of the airflow. The dissipating effect of the dissipation fan is further increased.

Abstract: A fastener has a leg, a foot, an elastic portion and a flange formed on the leg, wherein the elastic portion has a ring around the leg and two bow arms oppositely connects two sides of the ring with two sides of the leg. The flange is higher than the ring of the elastic on the leg, so that the movement of the bow arms is limited by the flange. Therefore the fastener ensures the bow arms has elasticity after installation into the heat sink.

Abstract: A bearing assembly for a heat dissipation fan includes a bearing and a cap. The bearing has multiple grooves peripherally defined in the cylindrical body and a room defined in the body to communicate with the through hole in the center of the body. The cap is securely mounted on top of the bearing so that lubricant is able to be stopped from further movement away from the room.

Abstract: A buffer pad is provided for use in an electric fan that has a blade assembly and a spindle extending from the blade assembly and rotatably supported in a bearing. The spindle further has a distal end extending beyond the bearing. The inventive buffer pad includes a wear-resistant piece for abutting the distal end of the spindle, and a resilient body adapted to be held in place within the electric fan for resiliently supporting the wear-resistant piece. The buffer pad can absorb vibrations generated by the rotary blade assembly.

Abstract: A heat dissipation fan that has a casing, a stator and a fan. The stator is pressed onto a sleeve secured in the casing. The stator has a coil and two pole disks respectively abutting opposite sides of the coil. A low-friction member is mounted in the sleeve. The fan is rotatably mounted in and around the stator inside the casing. A permanent magnet is mounted in the fan to make the fan a rotor. A shaft securely attached to the fan extends from the fan and passes through the low-friction member. The permanent magnet has an axial height shorter than that of the coil of the stator. The permanent magnet has a horizontal central line axially displaced from a horizontal central line of the coil of the stator. Accordingly, the fan with the shaft will not move axially during the operation of the heat dissipation fan. Power loss will be avoided.

Abstract: A heat dissipation fan that has a casing, a stator and a fan. The stator is pressed onto a sleeve secured in the casing. The stator has a coil and two pole disks respectively abutting opposite sides of the coil. A low-friction member is mounted in the sleeve. The fan is rotatably mounted in and around the stator inside the casing. A permanent magnet is mounted in the fan to make the fan a rotor. A shaft securely attached to the fan extends from the fan and passes through the low-friction member. The permanent magnet has an axial height shorter than that of the coil of the stator. The permanent magnet has a horizontal central line axially displaced from a horizontal central line of the coil of the stator. Accordingly, the fan with the shaft will not move axially during the operation of the heat dissipation fan. Power loss will be avoided.

Abstract: An air flow guide device for mounting on a heat dispensing fan includes a U-shaped frame and each of the three sides of the frame has a curve outer surface. A plate is connected between two distal ends of the frame and extends inclinedly from a top edge of the two distal ends of the frame, and a slot is defined between the two distal ends of the frame and the plate. Air flow smoothly flows over the curve smooth surfaces and is sucked by the fan. The plate prevents the exhausted air from being sucked by the fan.