Composite heat-dissipating device

摘要

A composite heat-dissipating device is provided for significantly increasing the number and size of blades so as to enhance the heat-dissipating performance. The composite heat-dissipating device is constructed by a plurality of impellers (1,1'), each of which includes a plurality of blades (12). When the plurality of impellers (1,1') are assembled together, the plurality of blades (12) are arranged around the hub of the composite heat-dissipating device and there is an overlapped region formed between every two adjacent blades (12).