Two-stage compression sliding vane vacuum pump driven by rotary ring

The invention discloses a two-stage compression sliding vane vacuum pump driven by a rotary ring. The vacuum pump is composed of a front end cover (1), a rotary ring cover (2), a rotary ring (3), slide vanes (4), a cylinder (5) and a rear end cover (6), wherein the outer cylinder shape line (503) and the inner cylinder shape line (504) are all smooth, and the radius of curvature is continuous; thefront end cover (1), the rotary ring cover (2), the rotary ring (3) and the cylinder (5) form six cavity bodies with different volumes, the volume of the three cavities on the outer side of the rotary ring (3) is the same, and the volume of the three cavities on the inner side of the rotary ring (3) is the same. According to the vacuum pump, the exhaust amount can be increased, the inner volume ratio is improved, the clearance volume is reduced, the volume utilization rate and the vacuum degree of the vacuum pump are improved, and the stress condition of the sliding vanes is improved. 本发明公开了一种转环驱动的两级压缩滑片式真空泵，该真空泵由前端盖