Abstract: A centrifugal fan module, a heat dissipation device having the same and an electric device having the heat dissipation device are provided, in which the heat dissipation device includes a fin module and a centrifugal fan module including a volute-shaped frame and a centrifugal fan pivoted in the volute-shaped frame. The volute-shaped frame includes an air inlet, a larger air outlet and a smaller air outlet. The air inlet and the smaller air outlet are both on the same surface of the volute-shaped frame. The larger air outlet is coupled to the fin module. The smaller air outlet is arranged correspondingly to a maximum wind-speed flowing path of the centrifugal fan.

Abstract: A centrifugal fan is provided. The centrifugal fan includes a housing, a driving device, and blades. The housing includes a circular base and at least two struts. Each of the struts physically connects the circular base and the remainder of the housing, and each of the struts includes two peripheral edges. The driving device is placed on the circular base. Each of the blades has an arc shape and the blades are located in the housing. The driving device rotates the blades. The two peripheral edges of each of the struts form orthogonal curves with the blades.

Abstract: A heat dissipation module includes a heat dissipation device, a resilient bracket and a cylindrically shaped nut. The heat dissipation device is attached to a heat generating component. The cylindrically shaped nut has an arc surface and two circular surfaces. A screw hole is formed on one of the two circular surfaces and an engraved slot is formed on the arc surface. The resilient bracket is secured to the heat dissipation device at an end and has a U-shaped cutout at an opposite end, wherein the U-shaped cutout has a constricted opening for receiving the cylindrically shaped nut. The U-shaped cutout engages with the engraved slot.

Abstract: A centrifugal fan includes a spiral-shaped housing with a driving mechanism and multiple internally mounted centrifugal impellers. The driving mechanism is mounted on a circular base. At least two support brackets links the circular base to the spiral-shaped housing, wherein profiles of the support brackets are involute curves based upon the circular base. The multiple centrifugal impellers, driven by the driving mechanism, suck airflow into the spiral-shaped housing through void spaces among the support brackets. The centrifugal impellers are perpendicular to the support bracket profiles.

Abstract: The invention provides a heat-dissipation device and a heat-dissipation method thereof. The electronic device includes a heat source, a thermal interface material (TIM) in contact with the heat source, a heat-dissipation module in contact with the thermal interface material, and an elastic member pushing the heat-dissipation module toward the heat source. The elastic member includes a base and a compressible portion extending from the base, whereby a force, applied to the compressible portion, is transmitted to and uniformly distributed on the base. The heat-dissipation method includes the steps of overlapping a thermal interface material and a heat-dissipation module on the heat source, and exerting a force toward the heat source to the heat-dissipation module.

Abstract: A centrifugal fan includes a spiral-shaped housing with a driving mechanism and multiple internally mounted centrifugal impellers. The driving mechanism is mounted on a circular base. At least two support brackets links the circular base to the spiral-shaped housing, wherein profiles of the support brackets are involute curves based upon the circular base. The multiple centrifugal impellers, driven by the driving mechanism, suck airflow into the spiral-shaped housing through void spaces among the support brackets. The centrifugal impellers are perpendicular to the support bracket profiles.

Abstract: A centrifugal fan includes a spiral housing, a driving mechanism and multiple internally mounted impellers. The driving mechanism and the centrifugal impeller, rotated by the driving mechanism, are installed in the spiral housing. A spiral flow channel is defined between the centrifugal impeller and the spiral housing. When the centrifugal impeller rotates, airflow is sucked axially into the spiral housing through an inlet opening and moves along each blade of the centrifugal impeller into the spiral flow channel. The centrifugal impeller includes a hub and multiple blades. Each blade is secured to the hub at one end and has at least one vertical convex strip or vertical concave strip at an opposite end, wherein the vertical convex strip or vertical concave strip on each of blade disturbs the airflow across thereof and reduces narrow-band noise.

Abstract: A centrifugal fan is described. The centrifugal fan is suitable for a portable electrical apparatus. A tongue shape is formed from a volute sidewall of a casing of the centrifugal fan and non-parallel to a rotational axis of blades. Therefore, when the blades rotate to generate a wake flow to blow on a surface of the volute sidewall at the tongue shape, noise generated by the centrifugal fan can be decreased.

Abstract: An extended fin array has a main heat-dissipation module and an extended heat-dissipation module. The main heat-dissipation module and the extended heat-dissipation module are stacked to increase the effective convective area to increase the heat-dissipation effect. The extended heat-dissipation module is in the main heat-dissipation module when the heat amount generated by an electronic device is normal. The extended heat-dissipation module extends out from the main heat-dissipation module to increase the heat convection area when the heat amount generated by the electronic device is large.

Abstract: A heat-dissipating structure. The heat-dissipating structure comprises a plurality of first and second conductive plates. Each first conductive plate has a first base surface, a first reference surface and a first main disturbing portion disposed on the first base surface and the first reference surface, and each second conductive plate has a second base surface, a second reference surface and a first sub disturbing portion disposed on the second base surface and the second reference surface. A middle passage, formed between two adjacent first and second conductive plates by facing the second base surface of the second conductive plate to the first reference surface of the first conductive plate, provides airflow passing therethrough with uniform flow resistance.

Abstract: A heat dissipation device for dissipating heat form a heat source includes a control unit, a sensor, a first heat dissipation module, a second heat dissipation module, and a driving mechanism. The sensor electrical connects with the control unit and detects a temperature of the heat source, and reports the temperature to the control unit. The second heat dissipation module is retractably connected to the first heat dissipation module. The driving mechanism is electrically connected to the control unit and the second heat dissipation module. When the temperature exceeds a first temperature, the control unit informs the driving mechanism to extend away from the second heat dissipation module with respect to the first heat dissipation module.

Abstract: An aluminum extruded fin set includes a substrate and a plurality of dissipation fins mounted upright on it. There are gaps between heat dissipation fins. Each dissipation fin is divided into three child dissipation fins by two slanted cutouts. The child dissipation fin between two slanted cutouts is bent toward the gap between heat dissipation fins. When airflow passes by the gaps, the airflow velocity distribution is modified due to the bent child dissipation fins and the noise spectrum distribution is modified as well. Such a Hay-stack noise spectrum distribution is more comfortable for the listener than a conventional one.

Abstract: A heat dissipation device is described. The heat dissipation device is suitable for electrical equipment, and particularly for a notebook computer. The heat dissipation device has a cooling fan and a plurality of heat dissipation fins. The heat dissipation fins are disposed at an outlet of the cooling fan to exhaust heat on the heat dissipation fins with airflow generated by the cooling fan. Each of spaces between the adjacent heat dissipation fins is determined so as to make the airflow velocity uniform. A preferred predetermined space is about C1×1/(V2?1), where V is an original airflow velocity at the adjacent heat dissipation fins and C1 is a coefficient.

Abstract: A staggered fin array has a plurality of dissipation fins disposed upright on a substrate. Each dissipation fin has at least one staggered structure at one side or on opposite sides thereof. The staggered structure has two stair structures. Each stair structure has many step surfaces parallel to the airflow direction. An interval surface is formed between adjacent step surfaces. The interval surface is designed as an opening. No more than two leading ledges, formed by the openings, are formed in a single airflow route.

Abstract: The invention provides a heat-dissipation device and a heat-dissipation method thereof. The electronic device includes a heat source, a thermal interface material (TIM) in contact with the heat source, a heat-dissipation module in contact with the thermal interface material, and an elastic member pushing the heat-dissipation module toward the heat source. The elastic member includes a base and a compressible portion extending from the base, whereby a force, applied to the compressible portion, is transmitted to and uniformly distributed on the base. The heat-dissipation method includes the steps of overlapping a thermal interface material and a heat-dissipation module on the heat source, and exerting a force toward the heat source to the heat-dissipation module.

Abstract: A centrifugal fan is described. The centrifugal fan is suitable for a portable electrical apparatus. A tongue shape is formed from a volute sidewall of a casing of the centrifugal fan. The volute sidewall is formed with at least one groove substantially extending horizontally at the tongue shape. Therefore, when the blades rotate to generate a wake flow to blow on a surface of the volute sidewall at the tongue shape, noise generated by the centrifugal fan can be reduced.

Abstract: A heat dissipation device for dissipating heat form a heat source includes a control unit, a sensor, a first heat dissipation module, a second heat dissipation module, and a driving mechanism. The sensor electrical connects with the control unit and detects a temperature of the heat source, and reports the temperature to the control unit. The second heat dissipation module is retractably connected to the first heat dissipation module. The driving mechanism is electrically connected to the control unit and the second heat dissipation module. When the temperature exceeds a first temperature, the control unit informs the driving mechanism to extend away from the second heat dissipation module with respect to the first heat dissipation module.

Abstract: A staggered fin array has a plurality of dissipation fins disposed upright on a substrate. Each dissipation fin has at least one staggered structure at one side or on opposite sides thereof. The staggered structure has two stair structures. Each stair structure has many step surfaces parallel to the airflow direction. An interval surface is formed between adjacent step surfaces. The interval surface is designed as an opening. No more than two leading ledges, formed by the openings, are formed in a single airflow route.

Abstract: An aluminum extruded fin set includes a substrate and a plurality of dissipation fins mounted upright on it. There are gaps between heat dissipation fins. Each dissipation fin is divided into three child dissipation fins by two slanted cutouts. The child dissipation fin between two slanted cutouts is bent toward the gap between heat dissipation fins. When airflow passes by the gaps, the airflow velocity distribution is modified due to the bent child dissipation fins and the noise spectrum distribution is modified as well. Such a Hay-stack noise spectrum distribution is more comfortable for the listener than a conventional one.

Abstract: A centrifugal fan with a resonant silencer has a centrifugal impeller and an outer housing. The outer housing has an inlet, an outlet and a resonant silencer. An inlet is positioned along an axial direction of the centrifugal impeller. An outlet is positioned along a radial direction of the centrifugal impeller. The resonant silencer, extended from a cut-off, can reduce noise caused by a vortex. The resonant silencer can be I- or L-shaped. The cut-off can be covered by a net filter, which isolates the resonant silencer from the flow motivated by the centrifugal impeller.