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US 2009/0155104 A1Published application
Contra-rotating axial flow fan unit
AssigneeNidec Corporation
InventorsHidenobu Takeshita, Tomotsugu Sugiyama, Tsukasa Takaoka
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Abstract
An axial flow fan unit includes an intake side axial flow fan, an exhaust side axial flow fan, and at least one intermediate axial flow fan. Each of the axial flow fans includes an impeller having blades rotatable about a central rotation axis, a motor arranged to rotate the intake side impeller, and a housing having an inner circumferential surface that surrounds the impeller. The rotational direction of the impeller in the intermediate axial flow fan is different from that of the impellers adjacent thereto.
Claims21
An axial flow fan unit comprising:
- an intake side axial flow fan including:
- an intake side impeller arranged to rotate about a central rotation axis and having intake side blades;
- an intake side motor arranged to rotate the intake side impeller;
- and
- an intake side housing having an inner circumferential surface that surrounds the intake side impeller;
- an exhaust side axial flow fan including:
- an exhaust side impeller arranged to rotate about the central rotation axis and having exhaust side blades;
- an exhaust side motor arranged to rotate the exhaust side impeller;
- and
- an exhaust side housing having an inner circumferential surface that surrounds the exhaust side impeller;
- and
- at least one intermediate axial flow fan arranged between the intake side axial flow fan and the exhaust side axial flow fan, each of the at least one intermediate axial flow fan including:
- an intermediate impeller arranged to rotate about the central rotation axis and having intermediate blades;
- an intermediate motor arranged to rotate the intermediate impeller;
- and
- an intermediate housing having an inner circumferential surface that surrounds the intermediate impeller;
- wherein a rotational direction of the intermediate impeller is different from that of the impellers adjacent thereto.
14 more elements
Dependencies are inferred from the claim text.