Abstract: A centrifugal fan includes a fan frame (20), and a stator (30) and a rotor (40) received in the fan frame. The fan frame includes a bottom base (22), an opposite top cover (21) and a side wall (23) interconnecting the bottom base and the top cover. A first air inlet (24a) is defined in the top cover and a second air inlet (24b) is defined in the bottom base. The rotor includes a hub (41) and a plurality of blades (42) extending from an outer periphery of the hub. An air flow channel (48) is formed between an outer periphery of the blades and the side wall of the fan frame. A cylindrical wall (26, 26a) is formed around one of the first air inlet and the second air inlet to guide airflow from the first and second air inlets into the air flow channel and block the airflow in the air flow channel from flowing back towards the first and second air inlets.

Abstract: A cooling fan (20) includes a housing (22) and an impeller (24). The housing has a base (221), a sidewall (222) extending from a periphery of the base with an air outlet (226) defined therein, and a cap (223) covering the sidewall. The impeller has a plurality of blades (242) rotatably received in the housing for generating an airflow. An air channel (225) is formed between tip portions of the blades and an inner face of the sidewall. The air outlet has a near section (226A) and a far section (226C). The airflow first reaches the near section and then the far section. The base of the housing has a protrusion (227) extending into the air outlet for guiding the airflow flowing towards the far section from the near section of the air outlet.

Abstract: A heat dissipation device includes a fan (200), a first wire collection structure (280) and a second wire collection structure (290). The fan (200) includes a frame (210) and an impeller (240) disposed in the frame (210). The first wire collection structure (280) is formed on the frame (210) to collect wires (270) of the fan (200). The second wire collection structure (290) is formed on the frame (210) and configured for collecting wires (460) of another component other than the fan (200).

Abstract: A cooling fan includes a frame (100) and an impeller (200) having a plurality of blades (240) disposed in the frame (100). The frame (100) has a cap (120) with an air inlet (122), a base (140) and a sidewall (160) extending from a periphery of the base (140) with an air outlet (180) defined therein. The cap (120) is mounted on the sidewall (160) with a chamber formed between the cap (120), the base (140) and the sidewall (160). A curved tongue portion (190) is formed on the sidewall (160) in vicinity of the air outlet (180). A protrusion (124) is formed on the cap (120) in vicinity of the curved tongue portion (190) and protrudes into the air inlet (122).

Abstract: A heat dissipation apparatus (10) for dissipating heat from a heat-generating electronic component includes a fin assembly (12) and a centrifugal blower (14). The fin assembly includes a plurality of laminar fins (121) thermally connecting with the heat-generating electronic component to absorb heat therefrom. The centrifugal blower provides an airflow flowing through the fin assembly to take heat away therefrom. The centrifugal blower includes a housing (141), a cover (142) disposed on the housing, and a rotor (143) rotatably received in a space formed between the housing and the cover. The fins of the fin assembly are disposed in the housing of the centrifugal blower and stacked together along a direction substantially parallel to a rotation axis (A) of the rotor.

Abstract: A cooling fan includes a frame (100) and an impeller (200) with blades (240) disposed in the frame (100). The frame (100) has a base (140) and a sidewall (160) extending from a periphery of the base (140) with an air outlet (180) defined therein. The base (140) has an air inlet (142) and a vent hole (148) defined therein. The vent hole (148) is near the air outlet (180) and between tip portions of the blades (240) and the sidewall (160). In a preferred embodiment, the base (140) has a supporting portion (144) disposed in the air inlet (142). Two ribs (146) extend from a periphery of the supporting portion (144) towards the base (140). One of the ribs (146) is arranged adjacent to the air outlet (180) and has a changeable width which is gradually increased along a direction from the supporting portion (144) to the base (140).

Abstract: A cooling fan (100) includes a housing (50) and an impeller (20) rotatably received in the housing. The housing includes a bottom base (52) and a top cover board (59). The impeller includes a plurality of fan blades (25). A bump (58) extends upwardly from the base and surrounds a portion of an outer periphery of the impeller for blocking a portion of an airflow generated by the impeller and rebounded from the housing from entering the fan blades via a bottom of the fan blades.

Abstract: A centrifugal fan includes a fan frame (20) and a fan impeller (10) received in the fan frame. The fan impeller includes a hub (12) and a plurality of fan blades (14) extending radially from an outer periphery of the hub. Each of the fan blades has a leeward lateral surface (144a) and an opposite windward lateral surface (144b) as the fan impeller rotates. At least one of the fan blades has a rib (146) protruding longitudinally and outwardly from the leeward lateral surface of the fan blade. The rib is located adjacent to an outmost free end of the fan blade and adapted for blocking an airflow generated by the fan impeller to flow back towards the fan blades of the fan impeller.

Abstract: A centrifugal fan includes a fan frame (20) and an impeller (40) received in the fan frame. The impeller includes a hub (41) having a circular top wall (410) and a cylindrical side wall (412) extending downwardly from a rim of the circular top wall, a plurality of blades (42) extending radially from the side wall of the hub and a blade ring (44). The blade ring includes an annular top plate (441), a cylindrical sidewall (442) extending downwardly from an outer periphery of the top plate, and a flange (443) extending outwardly from a bottom of the cylindrical sidewall. The blade ring is arranged on top surfaces of the blades received in an air inlet (24a) defined in a top surface of the fan frame, and the top plate of the blade ring and the top surface of the fan frame are coplanar with each other.

Abstract: A thermal module includes a centrifugal fan (20) and a fin unit (30). The centrifugal fan includes a casing (21) and a rotor (22) received in the casing. The casing defines an air outlet (24) through which an airflow generated by the fan flows, the air outlet having a front side outlet section (24a), a rear side outlet section (24b) and a central outlet section (24c) between the front side outlet section and the rear side outlet section. The fin unit includes a plurality of fins arranged across the air outlet of the fan. The fins arranged at the front side outlet section and the rear side outlet section of the air outlet have a longer length than the fins arranged at the central outlet section of the air outlet.

Abstract: A thermal module includes a centrifugal fan (10), a fin assembly (20) disposed at an air outlet of the centrifugal fan and two heat pipes (30, 40). The fin assembly includes a plurality of fins (21) connected together. Each fin has a front surface (212) and a rear surface (213) opposite the front surface. An elongated protruding member (218) is formed on the fin and protrudes from the rear surface towards the front surface. A recessed concave (219) corresponding to the protruding member is defined in the rear surface of the fin. At least one slit is defined along the protruding member and communicates with the concave. The protruding member divides the fin into first and second fin portions (20a, 20b). The two heat pipes thermally interconnect the first and second fin portions with two heat generating electronic components, respectively.

Abstract: A heat dissipation apparatus (100) includes a centrifugal blower (20) and a heat dissipater (10). The centrifugal blower includes a casing (22), a stator accommodated in the casing, and a rotor (24) rotatable disposed around the stator. The casing includes a base wall (224), a sidewall (226) surrounding the base wall and a cover (222) attached to the sidewall. The sidewall defines an air outlet (221) therein. An air channel (223) is formed between blades (242) of the rotor and an inner surface of the sidewall of the casing. The heat dissipater is made of porous material and disposed at the air outlet of the centrifugal blower. The heat dissipater has a tongue portion (12) extending into a part of the air channel.

Abstract: An impeller (10) for a cooling fan includes a hub (20) having a circular wall (22) and an annular sidewall (24) extending upwardly from a periphery of the circular wall, and a plurality of blades (30) extending radially from the sidewall of the hub. Each of the blades includes a first portion (32) near the hub and a second portion (34) away from the hub, wherein each of the second portions has a pair of opposite ribs (36) formed on two lateral sides thereof, thereby reducing a noise level generated by the impeller when the impeller rotates.

Abstract: A thermal module includes a centrifugal blower (10), a heat sink (20) mounted to an air outlet (11) of the centrifugal blower, a heat pipe (40) connecting the heat sink with a heat generating electronic component, and a resilient clip (80) for mounting the heat pipe onto the heat generating electronic component. The resilient clip includes an M-shaped pressing portion (82) disposed above an evaporation section (44) of the heat pipe, a plate portion (83) disposed at one end of the pressing portion for being fixed to a sidewall (53d), and an abutting portion (85) disposed at the other end of the pressing portion and including an abutting plate (85b) for abutting against a bottom surface of another sidewall (53b).

Abstract: An impeller (10) for a cooling fan includes a hub (20) having a circular wall (22) and an annular sidewall (24) extending downwardly from a rim of the circular wall, and a plurality of blades (30) extending radially from the sidewall of the hub. Each of the blades includes a first portion (32) near the hub and a second portion (34) away from the hub, wherein each of the first portions is identical to an adjacent one of the first portions, and each of the second portions is different from an adjacent one of the second portions regarding a height thereof, thereby reducing a noise level of the impeller when the it operates.

Abstract: A centrifugal blower (10) includes a casing (12) and a rotor (14) rotatable disposed in the casing. The casing includes a base plate (121), a sidewall (122) extending from the base plate and a cover (123) covering the sidewall. The sidewall is a multilayer structure and includes a first section (128a) and a second section (128c). A distance between a central axis (A) of the rotor and an inner surface of the second section is greater than that between the central axis of the rotor and an inner surface of the first section. The first section is located below a mother board (20) and the second section sits on a top surface of the motherboard when the centrifugal blower is mounted to the mother board.

Abstract: A heat dissipation device includes a cooling fan (15) defining an air inlet and an air outlet (157) oriented perpendicular to the air inlet; a metal foam (11) is arranged in the air outlet of the cooling fan, and a heat pipe (13) has a condensing end (131) being thermally attached to the metal foam. The metal foam forms numerous open cells (118). A plurality of guiding holes (116) are defined in the metal foam facing to a rotor (153) of the cooling fan for an airflow generated by the cooling fan to flow therethrough. The guiding hole (116) has a size larger that that of the open cell (118). The guiding hole has an outer end opened to an outside of the cooling fan (15).

Abstract: A thermal module (100) includes a centrifugal blower (20), a heat dissipater (10) and a plurality of heat transfer plates (34). The centrifugal blower includes a casing (22), a stator accommodated in the casing, and a rotor (24) rotatably disposed around the stator. The casing includes a base wall (224) and a sidewall (222) surrounding the base wall. The sidewall defines an air outlet (221) in front of the rotor. The heat dissipater is made of porous material and disposed at the air outlet of the centrifugal blower. The heat transfer plates extend into the heat dissipater so as to increase heat transfer efficiency between a heat generating electronic component and the heat dissipater.

Abstract: A thermal module includes a roll cage mounted to an enclosure of an electronic product, a centrifugal blower, and a fin assembly. The centrifugal blower is disposed in the roll cage and includes a housing integrally formed with the roll cage and defining an air outlet therein, a cover attached to the housing to cooperatively define a receiving chamber therebewteen, and a rotor rotatably disposed in the receiving chamber for producing an airflow. The fin assembly is disposed at the air outlet of the blower to perform heat convection with the airflow flowing therethrough.