Heat dissipation module and flow direction controlling structure thereof
A heat dissipation module includes a first heat dissipation apparatus, a second heat dissipation apparatus, and a flow direction controlling structure. The first heat dissipation apparatus and the second heat dissipation apparatus are symmetrically disposed. The flow direction controlling structure has several rotatable elements disposed between the first heat dissipation apparatus and the second heat dissipation apparatus. Each of the rotatable elements has a fixed end and a correspondingly movable end for guiding airflow. The rotatable elements can be sheet-shaped, wing-shaped, arc-shaped or nonlinear in cross section. The thickness of the rotatable elements varies or decreases from the fixed end to the movable end. The rotatable elements overlap an adjacent rotatable element so as to selectively seal the heat dissipation apparatuses. The heat dissipation module and the flow direction controlling structure control airflow, remain overall outlet scope, reduce noise and improve heat dissipation efficiency of the module.
1. A heat dissipation module, comprising:
a housing;
at least two impellers disposed in the housing; and
a flow direction controlling structure, comprising a limiting element and a plurality of rotatable elements disposed at an outlet of the housing;
wherein each of the rotatable elements comprises a fixed end and a correspondingly movable end, for guiding airflow;
wherein the impellers comprise a first impeller and a second impeller, and when outlet pressure of corresponding to the first impeller and the second impeller are different, the movable ends of the rotatable elements deflect to the first impeller or the second impeller to change outlet areas of the first impeller and the second impeller, and when the first impeller and the second impeller are in operation, the limiting element limits the movable ends of the rotatable elements from deflecting to the first impeller or the second impeller.
2. The heat dissipation module as claimed in claim 1 , wherein a cross section of each of the rotatable elements is sheet-shaped, wing-shaped, arc-shaped or nonlinear.
3. The heat dissipation module as claimed in claim 1 , wherein each of the rotatable elements overlaps an adjacent rotatable element so as to selectively seal the impellers.
4. heat dissipation module as claimed in claim 1 , wherein when the first impeller malfunctions, the movable ends of the rotatable elements are forced by air flow generated by the second impeller and deflect to the first impeller to prevent backflow from entering the first impeller.
5. The heat dissipation module as claimed in claim 1 , wherein one of the rotatable elements acts as an isolation wall between the first impeller and the second impeller, so that the first impeller and the second impeller respectively connect to a individual tunnel.
6. The heat dissipation module as claimed in claim 1 , wherein the flow direction controlling structure is modularly and rotatably disposed and detachably attached in one or more positions between the first impeller and the second impeller.
7. The heat dissipation module as claimed in claim 1 , wherein the heat dissipation module is a parallel fan.
8. The heat dissipation module as claimed in claim 1 , wherein a thickness of each of the rotatable elements varies from the fixed end to the movable end, or the thickness of each of the rotatable elements decreases from the fixed end to the movable end.