Abstract: The present invention relates to a fan blade structure and a centrifugal fan. The centrifugal fan comprises a fan case having a first inlet and an outlet and a fan blade structure received in the fan case. The fan blade structure comprises a hub and a plurality of blades disposed at the outer edge of the hub. Each of the blades has a first portion and a second portion. A virtual line extends vertically between the first portion and the second portion. The surface area of the first portion is larger than or smaller than that of the second portion. An outside space which is not vertical to a first inlet plane around the first inlet is formed between one side of the second portion of each of the blades and the inner side of the side wall of the fan case.

Abstract: The present invention relates to a fan blade structure and a centrifugal fan. The centrifugal fan comprises a fan case having a first inlet and an outlet and a fan blade structure received in the fan case. The fan blade structure comprises a hub and a plurality of blades disposed at the outer edge of the hub. Each of the blades has a first portion and a second portion. A virtual line extends vertically between the first portion and the second portion. The surface area of the first portion is larger than or smaller than that of the second portion. An outside space which is not vertical to a first inlet plane around the first inlet is formed between one side of the second portion of each of the blades and the inner side of the side wall of the fan case.

Abstract: A thermal module includes a heat sink and a cooling fan. The heat sink has a main body, from an outer periphery thereof a plurality of radiating fins and at least one fixing section are outward extended. The fixing section is provided on one lateral side with at least one first mating part. The cooling fan has a housing having a blade hub arranged therein. The housing is provided on one side facing toward the heat sink with at least one second mating part and an axially raised wall portion. The raised wall portion is pressed against the heat sink to thereby define a space between the cooling fan and the heat sink. The cooling fan and the heat sink can be quickly assembled together through engagement of the first and the second mating part with one another to reduce the material and labor costs of the thermal module.

Abstract: A cooling fan includes a base having a hollow bearing cup for receiving a bearing therein, a motor winding support mounted to a top of the bearing cup, and a blade hub mounted atop the motor winding support. The bearing cup is externally provided with channels and stop portions communicating with the channels. Each of the stop portions includes a recess and a projection. The motor winding support is internally provided with stoppers corresponding to the stop portions. Each of the radial stoppers includes a raised portion for engaging with the recess, and a sideward extended portion for abutting on a bottom of the projection. The motor winding support can be rotated to lock to the bearing cup through engagement of the stop portions with the radial stoppers. No glue dispensing is needed, and the problems of a deformed bearing and noise during fan operation are avoided.

Abstract: A thermal module includes a heat sink and a cooling fan. The heat sink has a main body, from an outer periphery thereof a plurality of radiating fins and at least one fixing section are outward extended. The fixing section is provided on one lateral side with at least one first mating part. The cooling fan has a housing having a blade hub arranged therein. The housing is provided on one side facing toward the heat sink with at least one second mating part and an axially raised wall portion. The raised wall portion is pressed against the heat sink to thereby define a space between the cooling fan and the heat sink. The cooling fan and the heat sink can be quickly assembled together through engagement of the first and the second mating part with one another to reduce the material and labor costs of the thermal module.

Abstract: A cooling fan includes a base having a hollow bearing cup for receiving a bearing therein, a motor winding support mounted to a top of the bearing cup, and a blade hub mounted atop the motor winding support. The bearing cup is externally provided with channels and stop portions communicating with the channels. Each of the stop portions includes a recess and a projection. The motor winding support is internally provided with stoppers corresponding to the stop portions. Each of the radial stoppers includes a raised portion for engaging with the recess, and a sideward extended portion for abutting on a bottom of the projection. The motor winding support can be rotated to lock to the bearing cup through engagement of the stop portions with the radial stoppers. No glue dispensing is needed, and the problems of a deformed bearing and noise during fan operation are avoided.