SCREW-TYPE VACUUM PUMP HAVING A DIRECT COOLING DEVICE

摘要

The present invention relates to a screw-type vacuum pump having a direct cooling device for directly cooling the inside of a rotor of the vacuum pump. The screw-type vacuum pump consists of: the rotor for generating a vacuum; a rotor shaft connected through a gear so as to transmit the rotation of a motor to the rotor so as to thereby rotate the rotor; and a fixed rotating shaft for supporting the rotation of the rotor. Cooling water for cooling the inside of the rotor may flow into injection and discharge tubes formed in the fixed rotating shaft so as to efficiently cool heat generated within the rotor. Further, a simplified structure in which the rotor is rotated by the fixed rotating shaft supported by a bearing inserted into the rotor may be provided, and a lubricant may be supplied to the bearing through a rotation screw of the rotor shaft so as to efficiently cool and lubricate the rotor.