| 摘要 |
A vacuum pump comprising a cylindrical pump casing for accommodation of a rotor; a ring fitting part provided at an air inlet area of the pump casing; a C-shaped ring of character C configuration devoid of portion of a ring member, fitted to the ring fitting part; and a protective net for prevention of foreign matter fitted to the air inlet area by means of the C-shaped ring. As end portions of the C-shaped ring in the state of being fitted to the pump casing are arranged overlapping each other in the circumferential direction thereof, there can be inhibited any deformation of the protective net for prevention of foreign matter by air inrush and avoided detachment of the protective net for prevention of foreign matter from the pump casing. |
