Axial-flow fan with double impellers

摘要

An axial flow fan with double impellers has a first (5) and a second (33) case. Each case has a suction opening (15, 41), an impeller, (7, 35) and a discharge opening (17, 57). The first case is on the discharge side connected to the suction side of the second case. First and second mounting structures (29, 31) are formed on the discharge side of the first case (5). Corresponding first and second mounting structures (53, 55) are formed on the suction side of the second case (33). When in an assembled state, the first and second mounting structures on the first and second cases are in mutual engagement to prevent the first (5) and second (33) cases from becoming separated.