| 摘要 |
PROBLEM TO BE SOLVED: To enable an full-closed operation of a regenerative blower, and to improve cooling effect of a bearing. SOLUTION: Rotation of a main shaft 3 of an electric motor rotates an impeller 4 of a blower part 2 to make a plurality of blades 5 create wind, and the wind is boosted in a boost passage 9 of a casing 8. Heat is generated from the blower part 2 by adiabatic compression and friction, and is transferred to increase a temperature of the electric motor 1 or a bearing 25. In this case, since an electric motor part is full-closed type, air does not flow from the electric motor 1 and the blower part 2 into the bearing 25. The heat transferred from the blower part 2 is not cooled and is transferred to the bearing 25 in a thermally-saturated stationary state. By providing a bypass 26 to a casing 8 passing through a suction port 24 of the blower part 2 and the inside of the casing 8 to utilize a suction force of the blower part 2, outside air passes from a ventilation passage 27 through an outside air blowout port 28 and the bypass 26 to the suction port 24, as shown in an arrow in the figure. In the process, the outside air is blown to the bearing 25 to efficiently cooling the bearing 25. COPYRIGHT: (C)2004,JPO
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