Serial axial fan

摘要

A fan includes a first motor portion, a first impeller fixed to a first rotating portion of the first motor portion, a second motor portion arranged along a central axis of the first motor portion, a second impeller fixed to a second rotating portion of the second motor portion, a tubular wind channel portion arranged to surround the first and second impellers, and support ribs arranged to join the wind channel portion to the first and second motor portions. The first impeller includes first blades arranged in a circumferential direction about the central axis and the second impeller includes second blades arranged in the circumferential direction, a rotation direction of the second impeller is opposite to a rotation direction of the first impeller. A surface of each first blade which faces the second impeller is concave. A surface of each second blade which faces the first impeller is concave.

主权项

1. A serial axial fan comprising:
a first motor portion including a first rotating portion; a first impeller fixed to the first rotating portion of the first motor portion; a second motor portion arranged along a central axis of the first motor portion, and including a second rotating portion; a second impeller fixed to the second rotating portion of the second motor portion; a tubular wind channel portion arranged to surround outer circumferences of the first and second impellers; and a plurality of support ribs arranged to join the wind channel portion to both the first and second motor portions; wherein the first impeller includes a plurality of first blades arranged in a circumferential direction about the central axis, and the second impeller includes a plurality of second blades arranged in the circumferential direction; each of the first and second impellers is configured to be rotatable in both directions, and a rotation direction of the second impeller is always opposite to a rotation direction of the first impeller; a portion of a surface of each of the plurality of first blades, the surface facing the second impeller, is concave, and a portion of a surface of each of the plurality of second blades, the surface facing the first impeller, is concave; the plurality of support ribs are located between the first and second impellers; an edge of each of the plurality of first blades on an opposite side with respect to the second impeller includes an inclined portion configured to become progressively more distant from the second impeller with increasing distance from the central axis; and an edge of each of the plurality of the second blades on an opposite side with respect to the first impeller includes an inclined portion configured to become progressively more distant from the first impeller with increasing distance from the central axis.