Patent ID: 11898563
Assignee: NIDEC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 4:
5. An axial fan comprising:
a housing that surrounds a vertically extending central axis, and includes an upper housing in an axially upper portion and a lower housing in an axially lower portion;
an upper motor that is accommodated in the upper housing and rotates an upper impeller about the central axis; and
a lower motor that is accommodated in the lower housing and rotates a lower impeller about the central axis; wherein
the upper housing includes a cylindrical upper peripheral wall covering the upper impeller and the upper motor from a radially outer side;
the lower housing includes a cylindrical lower peripheral wall covering the lower impeller and the lower motor from the radially outer side;
the lower peripheral wall includes lower engaging portions defined at a curved portion of a radially outermost surface of the lower housing;
the upper peripheral wall includes upper engaging portions defined at a curved portion of a radially outermost surface of the upper housing;
at least one of the lower engaging portions extends in parallel with a curved portion of a radially outermost surface of the lower housing;
at least one of the upper engaging portions extends in parallel with a curved portion of a radially outermost surface of the upper housing; and
at least one of the upper engaging portions engages with at least one of the lower engaging portions to affix the upper housing to the lower housing.