Bi-directional blowers for cooling computers

A computer system, comprising:

• a case defining a first vent, a second vent, and a third vent;
• a heat source in the case;
• a heat dissipating device inside the case, the heat dissipating device comprising:
• a motor;
• a rotary unit mounted on the motor;
• a housing receiving the motor and the rotary unit, wherein:
• the housing defines a hot air inlet, a hot air outlet, a cold air inlet, and a cold air outlet, the hot air inlet being coupled to an interior of the case, the hot air outlet being coupled to the first vent, the cold air inlet being coupled to the second vent, the cold air outlet being coupled to the third vent through the interior of the case.

A heat dissipating device, comprising:

• a motor;
• a rotary unit, comprising:
• a hub mounted to the motor;
• blades extending from the hub;
• a housing receiving the motor and the rotary unit, wherein:
• the housing defines an inlet and an outlet;
• the housing comprises a partition, the partition being close to outer ends of the blades, the partition being located between the hot air inlet and the hot air outlet.

A cooling module, comprising:

• a heat sink comprising fins;
• a round duct mounted adjacent to a first side of the heat sink, the round duct comprising a dividing wall abutting the fins of the heat sink;
• a heat dissipating device mounted adjacent to a second side of the heat sink, the device comprising:
• a motor;
• a rotary unit, comprising:
• a hub mounted to the motor;
• blades extending from the hub;
• a housing receiving the motor and the rotary unit, wherein:
• the housing defines a cold air inlet, a cold air outlet, a hot air inlet, and a hot air outlet, the cold air outlet and the hot air outlet abutting the fins of the heat sink;
• the housing comprises a first partition and a second partition, the first partition being located close to outer ends of the blades, the first partition being located between the cold air inlet and the hot air outlet, the second partition being located between the cold air outlet and the hot air inlet, the first and the second partitions dividing the housing into (1) a first channel coupling the cold air inlet and the cold air outlet and (2) a second channel coupling the hot air inlet and the hot air outlet and