| 摘要 |
PURPOSE:To improve the volume efficiency of a dry Roots blower through reducing its temperature by providing a cooling-water circulating hole in the shaft center of the rotating shaft of the dry Roots blower so as to supply cooling water to the inside of a rotor. CONSTITUTION:In the main rotating shaft 13 and the subsidiary rotating shaft 14 of a dry Roots blower cooling-water circulating holes 13a, 14a are provided respectively. One end of each of these cooling-water circulating holes 13a, 14a is connected the cavity within an impeller, that is, a rotor 12, and the other end to a cooling-water supply chamber and a cooling-water discharge chamber on both sides. The cooling water supplied through a cooling-water supply hole 20 to the cooling-water supply chamber goes through each of these cooling-water circulating holes 13a, 14a to the cavity within the rotor 12, and hereupon, the cooling water, which becomes warm and light in specific gravity, is concentrated by a centrifugal force and then discharged through each of these cooling-water circulating holes 13a, 14a, a cooling mater discharge chamber and a cooling- water exhaust port 21 to the outside.
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