Patent ID: 7753661

Claim:
A vacuum pump which generates vacuum by sucking and discharging a gas, comprising: a pump case for the vacuum pump; a thread pump stator that supports the pump case; a base that supports the thread pump stator; a stator column formed integrally with the base; a rotor arranged so as to cover the stator column; rotating blades provided in multiple stages at the outer periphery of the rotor; and a cooling water pipe buried in the wall of the stator column, one end of the cooling water pipe being branched into a plurality of water inlet ports and another end of the cooling water pipe being branched into a plurality of water outlet ports, wherein one water inlet port and one water outlet port are communicated with an outside of the vacuum pump at a side surface of the base, and another water inlet port and another water outlet port are communicated with the outside of an vacuum pump at a bottom surface of the base.