The existing notebook computer fan configuration structure includes a computer housing, a heat sink, a heat source and an axial fan, wherein the housing has an air inlet on the bottom surface and an air outlet on the side surface; The heat sink is in a long shape and is covered in the shell corresponding to the air inlet part and forms a heat dissipation chamber with the shell after being assembled in the shell, and an air outlet is formed at an open end of the heat sink and corresponding to the air outlet part of the shell after being assembled; the heat source abuts against the top surface of the heat sink; The axial fan is arranged in the heat dissipation chamber in parallel corresponding to the air inlet. However, the existing fan placement method has the following disadvantages:1.vertical backflow of the fan:the fan is arranged in parallel between the air inlet part and the heat radiating surface of the heat radiating seat, so that the air inlet direction of the fan is vertical as indicated by the arrow, which is easy to cause vertical backflow rebounding at the air inlet source. 2.easy to generate larger noise:the backflow of the wind source interferes with the fan blades and easily causes larger noise. 3.Shorten the life of the fan:The fan bearing directly contacts with the side of the heat sink facing the heat source and is easily damaged by heating, thus shortening the service life.

          The technical problem to be solved by the non-backflow low-noise fan is to provide a non-backflow low-noise computer cooling fan which can reduce backflow, reduce noise and increase the service life of the fan. The non-backflow low-noise computer cooling fan comprises a computer shell, a cooling seat, a heat source and an axial fan, wherein the shell is provided with a first air inlet part and an air outlet part; The heat sink is growing and is covered in the shell corresponding to the air inlet and forms an open heat sink with the shell corresponding to the end of the air outlet. a heat source abutting against the heat sink; The axial fan is assembled in the heat dissipation chamber corresponding to the air inlet part, and the axial fan is arranged at a deflection angle in the heat dissipation chamber so as to reduce the return flow of the air source entering the first air inlet part. It mainly deflects the fan by an angle to reduce fan backflow, and an air inlet part is additionally arranged on one side of the shell to increase the overall air inlet area, i.e.increase the heat dissipation area and prolong the service life.