A heat dissipation fan is generally fixedly arranged on the inner side of the back plate of the existing computer case, and a ventilation area formed by densely distributed ventilation holes is arranged at the back plate relative to heat dissipation fan , and the area of the ventilation area is equivalent to that of the heat dissipation fan. The heat dissipation efficiency of the above-mentioned structure is not high, and due to the close distance between the heat dissipation fan and the ventilation area, larger noise will be caused by the impact of airflow during ventilation.

The purpose of the heat dissipation scheme is to provide a fan heat dissipation device in a computer case, which can improve the heat dissipation efficiency of the fan in the computer case and reduce noise generated by airflow.

The heat dissipation scheme provides a fan heat dissipation device in a computer case, which is characterized in that a heat dissipation fan is fixedly arranged on the back plate of the case, a ventilation area corresponding to the fan area is arranged on the back plate of the case opposite to the heat dissipation fan, and a plurality of ventilation holes are densely distributed in the ventilation area, and the fan heat dissipation device is characterized in that the back plate at the ventilation area protrudes outward in a boss shape.

The fan heat dissipation device in the computer case of the heat dissipation scheme is characterized in that a heat dissipation fan is fixedly arranged on the back plate of the case, and a ventilation area protruding towards the outer side of the back plate in a boss shape is arranged on the back plate of the case opposite to the heat dissipation fan; when wind flows from the inside of the case to the outside of the case, the wind beam is shrunk by the boss resistance, changes the flow direction, and is discharged out of the case through a ventilation hole; and through comparative tests, the ventilation resistance can be reduced a lot, so that the heat dissipation efficiency can be improved. In addition, as the distance between the heat dissipation fan and the ventilation area increases, the noise caused by airflow impact during ventilation will be greatly reduced.