| 摘要 |
PURPOSE: A dry vacuum pump is provided to control the vacuum degree of the vacuum pump by sequentially mounting a plurality of cylinders formed with gas discharging rotors. CONSTITUTION: A dry vacuum pump includes a rear cover formed with a cooling water inlet(30) on an outer peripheral surface and cooling water channels(32-42) for guiding cooling water introduced via the cooling water inlet to circulate respective cylinders and intermediate covers, a motor housing(8) formed with spiral cooling water circulation holes on the outer peripheral surface, and a front cover formed with an outlet of the cooling water circulation hole. The cooling water channels are respectively formed inside and outside gas channels(24) formed in the rear and intermediate covers, and flow tubes(43) which connect the cooling water channels to each other penetrates the gas channels for cooling compression gas. An additional adaptor(52) connects the cooling water outlet to the cooling water circulation holes. The outlet of the cooling water circulation hole is connected to the cooling water inlet of the rear cover by a cooling water tube(11). The cooling water tube is mounted with a cooling element(10) for forcible circulation of the cooling water to cool a water pump and the cooling water, thereby simultaneously cooling respective parts of the vacuum pump and gas compressed by screws.
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