Patent ID: 8109743

Claim:
A serially arranged axial flow fan unit comprising: a first axial flow fan including: a first motor; a plurality of first lead lines connected to the first motor; a first impeller rotatable about a center axis by the first motor; a first housing arranged to enclose the first motor and the first impeller, the first housing having a first recess extending from an inside to an outside of the first housing, the first recess being arranged in a first guide portion; and a plurality of first flange portions, the plurality of first flange portions including a first guide flange portion, the first recess being arranged adjacent to the first guide flange portion; and a second axial flow fan including: a second motor; a plurality of second lead lines connected to the second motor; a second impeller rotatable by the second motor; a second housing arranged to enclose the second motor and the second impeller, the second housing opposing the first housing and having a second recess extending from an inside to an outside of the second housing, the second recess being arranged in a second guide portion; and a plurality of second flange portions, the plurality of second flange portions including a second guide flange portion, the second recess being arranged adjacent to the second guide flange portion; wherein the first lead lines extend from the first housing through the first recess and the second lead lines extend from the second housing through the second recess; the first recess is spaced apart from or partially overlapped with the second recess along a circumferential direction; the plurality of first lead lines and the plurality of second lead lines are arranged directly adjacent to one another such that the plurality of first lead lines are drawn out of the axial flow fan unit through the first guide portion and the plurality of second lead lines are drawn out of the axial flow fan unit through the first guide portion and the second guide portion; and the first guide flange portion and the second guide flange portion being circumferentially aligned with one another, both the first guide portion and the second guide portion being arranged on a same circumferential side of the first guide flange portion and the second guide flange portion.