Half-volute single-suction fan

A half-volute single-suction fan comprises a shell, an exhaust inlet is fixedly connected to the middle of the front side of the shell, a support is fixedly connected to the lower portion of the rear side of the shell, a motor is fixedly connected to the top of the support, a rotating shaft of the motor is coaxially and fixedly connected with an impeller, the impeller is located in the shell, and the longitudinal section of the shell is in an arch shape. A rectangular opening is formed in the top end of the shell, and the top end of the rectangular opening extends upwards to form an air outlet; the length of the inner side of the air outlet is larger than the maximum diameter of the impeller, and the length of the outer side of the air outlet is not larger than the maximum outer diameter of the shell. The fan of the vacuum sweeper effectively solves the problems that air blown out by an existing fan of the vacuum sweeper is too strong, and noise of the blown air is large. 一种半蜗壳单吸风机，包括壳体，壳体前侧中部固定连接有有吸风口，壳体后侧下部