Blower apparatus
This blower apparatus includes an air blowing portion, a motor portion, and a housing. The housing includes an air inlet and an air outlet. The air blowing portion includes a plurality of flat plates arranged with an axial gap defined between adjacent ones of the flat plates; and a spacer arranged between the flat plates. A rotating portion of the motor portion includes a hub including a flat plate holding portion arranged to hold at least one of the flat plates. An air flow is generated between the flat plates by viscous drag of surfaces of the flat plates and a centrifugal force. With the spacer being arranged between the flat plates, the axial gap can be adjusted. Since at least one of the flat plates is held by the flat plate holding portion, the air blowing portion is able to stably rotate.
1. A blower apparatus comprising:
an air blowing portion arranged to rotate about a central axis extending in a vertical direction;
a motor portion arranged to rotate the air blowing portion; and
a housing arranged to house the air blowing portion and the motor portion; wherein
the housing includes:
an air inlet arranged above the air blowing portion, and arranged to pass through a portion of the housing in an axial direction; and
an air outlet arranged to face in a radial direction at at least one circumferential position radially outside of the air blowing portion;
the air blowing portion includes:
a plurality of flat plates arranged in the axial direction with an axial gap defined between adjacent ones of the flat plates; and
one or a plurality of spacers each of which is arranged in a region in the axial gap between axially adjacent ones of the flat plates, the region covering a portion of a radial extent of the axial gap;
the motor portion includes:
a stationary portion including an armature; and
a rotating portion including a magnet arranged radially outside of the armature, and a hub arranged to hold the magnet; and
the hub includes:
a top plate portion arranged to cover an upper side of the armature;
a magnet holding portion arranged to extend downward from the top plate portion to assume a cylindrical shape, and arranged to hold the magnet with an inner circumferential surface thereof; and
a flat plate holding portion arranged to extend radially on a radially outer side of the magnet holding portion, and hold at least one of the flat plates.
2. The blower apparatus according to claim 1 , wherein the hub includes:
a hub body member including the top plate portion and the magnet holding portion; and
a flange member including the flat plate holding portion.
3. The blower apparatus according to claim 1 , wherein at least one of the spacers defines a portion of the flat plate holding portion.
4. The blower apparatus according to claim 3 , wherein
the air blowing portion includes the plurality of spacers; and
the spacers include a bottom spacer arranged at a lowest position of all the spacers, the bottom spacer defining a portion of the flat plate holding portion.
5. The blower apparatus according to claim 3 , wherein
the air blowing portion includes the plurality of spacers; and
the spacers include a top spacer arranged at a highest position of all the spacers, the top spacer defining a portion of the flat plate holding portion.
6. The blower apparatus according to claim 3 , wherein
the air blowing portion includes three or more of the spacers;
the spacers include:
a top spacer arranged at a highest position of all the spacers;
a bottom spacer arranged at a lowest position of all the spacers; and
one or a plurality of intermediate spacers arranged between the top spacer and the bottom spacer; and
at least one of the intermediate spacers defines a portion of the flat plate holding portion.
7. The blower apparatus according to claim 1 , wherein a center of the air inlet is arranged to coincide with the central axis.
8. The blower apparatus according to claim 1 , wherein
the stationary portion further includes a bearing housing;
the rotating portion further includes a shaft and a bearing member;
the bearing housing and a combination of the shaft and the bearing member are arranged to have a lubricating fluid therebetween;
the bearing housing and the rotating portion are arranged to together define a gap defining a seal portion therebetween, the seal portion having a surface of the lubricating fluid defined therein; and
in the seal portion, a distance between the bearing housing and the rotating portion is arranged to increase with increasing distance from the surface of the lubricating fluid.
9. The blower apparatus according to claim 1 , wherein the motor portion further includes a ball bearing arranged to connect the rotating portion to the stationary portion such that the rotating portion is rotatable with respect to the stationary portion.
10. The blower apparatus according to claim 1 , wherein the housing includes a plurality of the air outlets at a plurality of circumferential positions.