Fan and dust collector

The utility model provides a fan and a dust collector wherein the fan comprises: a housing, the housing comprises a cavity and a first opening, the cavity is communicated with the first opening; the motor is arranged on the shell and comprises a driving shaft; the first fan is arranged on the driving shaft and located in the cavity; the second fan is arranged on the driving shaft and located in the cavity, and the second fan is far away from the first opening relative to the first fan; the diffuser is arranged in the cavity; and under the condition that the motor works, airflow sequentially passes through the first fan, the diffuser and the second fan. 本实用新型提出了一种风机和吸尘器，其中，风机包括：壳体，壳体包括腔体和第一开口，腔体和第一开口相连通；电机，设于壳体，电机包括驱动轴；第一风扇，设置在驱动轴上，位于腔体内；第二风扇，设置在驱动轴上，位于腔体内，第二风扇相对于第一风扇远离近第一开口；扩压器，设置在腔体内；其中，电机工作的情况下，气流依次通过第一风扇、扩压器和第二风扇。