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

Abstract

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.

Description

technical field [0001] The invention belongs to the field of vacuum pumps, in particular to a two-stage compression vane type vacuum pump driven by a rotary ring. Background technique [0002] The sliding vane vacuum pump is a volumetric fluid machine, relying on the continuous operation of the sliding vane in the pump chamber, the gas is sucked in and compressed by the suction port, and finally discharged from the exhaust port; Its advantages are widely used in metallurgy, electronics, medicine, and automobile industries; its key technology is the inner cavity shape of the pump cavity, and the shape of the inner cavity of the pump cavity directly affects the working performance of the vacuum pump. The common working cavity of the sliding vane vacuum pump is single cavity or double cavity. This kind of sliding vane vacuum pump has relatively small displacement and internal volume, and the ultimate vacuum degree of the vacuum pump is low. [0003] With the increase of the ap...

AI Technical Summary

Problems solved by technology

[0003] With the increase of the application area of ​​the vacuum pump, the requirements for the vacuum degree of the vacuum pump are also increasing. The concentric double-wave ring multi-sliding vane rotor machine proposed in the patent with the publication number CN277724 adopts the cavity profile constructed by the cosine function curve. The swivel divides the inner and outer cavity to realize a two-stage structure, which increases the flow rate of the liquid that can be transported and improves the stress of the slide; however, the change in the shape line vector is small, which is not conducive to increasing the internal volume ratio; the transmission disc There is relative movement between the cover and the cover, increasing the leakage

Images