| CPC F04D 19/007 (2013.01) [F04D 19/002 (2013.01); F04D 25/06 (2013.01); F04D 29/023 (2013.01); F04D 29/056 (2013.01)] | 9 Claims |
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1. An axial fan comprising a first fan unit and a second fan unit,
wherein each of the first fan unit and the second fan unit includes a rotor, a motor, a housing, and a bearing,
the rotor includes an impeller cup configured to rotate about a rotation axis, and a fan extending radially from the impeller cup,
the motor is provided inside the impeller cup,
the housing includes a housing portion housing the rotor, and a base portion supporting the motor, the bearing being configured to rotatably support the rotor relative to the base portion,
a connection portion is provided to an axial end surface of the base portion and on an inner peripheral side relative to the impeller cup,
the first fan unit and the second fan unit are connected to each other via the connection portions in a direction of the rotation axis,
the connection portion of the first fan unit is a round tubular part extending in the direction of the rotation axis,
the connection portion of the second fan unit has a round tubular shape extending in the direction of the rotation axis,
the connection portions are connected to each other by an engagement of an inner peripheral surface of the connection portion of the first fan unit and an outer peripheral surface of the connection portion of the second fan unit,
an inner diameter of an inner peripheral surface of the connection portion of the second fan unit is larger than an outer diameter of the bearing,
each of the base portions includes a bushing supporting the bearing, and
the connection portion is an integral part of an axial end surface of each of the bushing.
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