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US 2008/0175729 A1Published application
Axial flow fan
AssigneeNidec Corporation
InventorsYoshihisa KATO, Suguru YAMADA
Life of this patent
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Abstract
An axial flow fan includes a housing, a plurality of rotor vanes that rotate inside the housing, and a plurality of sheet-like stationary vanes that are disposed below the rotor vanes and fixed to the housing. The axial flow fan includes a motor that is connected to the rotor vanes and rotates the rotor vanes about a central axis. Each stationary vane has a projecting portion projecting axially upward from a sidewall of a base portion. The projecting portion of each stationary vane has an inner side surface on the central axis side. When a stator part is attached to the housing, the outer side surface of a circuit board radially meets the inner side surfaces. The circuit board axially meets the axially upper end surface of the sidewall of the base portion.
Claims13
An axial flow fan comprising:
- a base portion centered on a central axis, being hollow and approximately cylindrical, and having an open end at its top end;
- a circuit board arranged to axially face the base portion;
- an armature arranged above the circuit board;
- an impeller cup which is hollow and approximately cylindrical about the central axis and has an open end at its bottom end, the open end of the impeller cup facing the open end of the base portion;
- a field-generating magnet fixed to an inner side surface of the impeller cup and arranged to generate together with the armature a torque about the central axis;
- a bearing portion arranged to support the impeller cup in a rotatable manner about the central axis relative to the base portion;
- a plurality of rotor vanes extending radially from an outer side surface of the impeller cup and arranged to generate an axial airflow by rotating together with the impeller cup, the rotor vanes being inclined with respect to the central axis;
- and
- a stationary vanes extending radially from an outer side surface of the base portion and being inclined with respect to the central axis toward an opposite direction to the inclination direction of the rotor vanes, wherein
- the stationary vanes project from a top of a sidewall defining the outer side surface of the base portion, and
- an outer side surface of the circuit board is in radial contact with an envelope defined by connecting inner side surfaces of portions of the stationary vanes above the top of the sidewall of the base portion.
8 more elements
An axial flow fan comprising:
- a base portion being hollow and approximately cylindrical about a central axis, and having an open end at its top end;
- a circuit board arranged to axially face the base portion;
- an armature arranged above the circuit board;
- an impeller cup which is hollow and approximately cylindrical about the central axis and has an open end at its bottom end, the open end of the impeller cup facing the open end of the base portion;
- a field-generating magnet fixed to an inner side surface of the impeller cup and arranged to generate together with the armature a torque about the central axis;
- a bearing portion arranged to support the impeller cup in a rotatable manner about the central axis relative to the base portion;
- a plurality of rotor vanes extending radially from an outer side surface of the impeller cup and arranged to generate an axial airflow by rotating together with the impeller cup, the rotor vanes being inclined with respect to the central axis;
- and
- a stationary vanes extending radially from an outer side surface of the base portion and being inclined with respect to the central axis toward an opposite direction to the inclination direction of the rotor vanes, wherein
- a distance between an outer side surface of the circuit board and the central axis is approximately the same as or larger than a distance between the outer side surface of the base portion and the central axis.
7 more elements
An axial flow fan comprising:
- a base portion centered on a central axis, being hollow and approximately cylindrical, and having an open end at its top end;
- a circuit board arranged to axially face the base portion;
- an armature arranged above the circuit board;
- an impeller cup which is hollow and approximately cylindrical about the central axis and has an open end at its bottom end, the open end of the impeller cup facing the open end of the base portion;
- a field-generating magnet fixed to an inner side surface of the impeller cup and arranged to generate together with the armature a torque about the central axis;
- a bearing portion arranged to support the impeller cup in a rotatable manner about the central axis relative to the base portion;
- and
- a plurality of rotor vanes extending radially from an outer side surface of the impeller cup and arranged to generate an axial airflow by rotating together with the impeller cup, wherein
- a plurality of locking portions are circumferentially arranged on a top of a sidewall of the base portion which defines an outer side surface of the base portion, and
- an outer peripheral edge of the circuit board is locked by the locking portions.
7 more elements
Dependencies are inferred from the claim text.