Cantilever connecting structure for roots pump or screw pump

Abstract

The invention discloses a cantilever connecting structure for a roots pump or a screw pump. The cantilever connecting structure comprises an outer shell, a bearing end cover, a driving shaft rotor and a cantilever rotor, wherein the driving shaft rotor is connected with a driving positioning sleeve, and a circular boss is arranged on the driving positioning sleeve; the cantilever rotor comprises a linear rotor, a transition cylinder and a cantilever rotor positioning ring; the cantilever rotor positioning ring is fixedly connected with the driving positioning sleeve; and the cantilever rotor is sleeved with the outer shell, the bearing end cover is arranged at the outer side of the driving shaft rotor, a first step is arranged in the bearing end cover, a second step is arranged on the outer surface of the driving shaft rotor, a bearing cavity is formed between the first step and the second step, and a bearing is installed in the bearing cavity. The cantilever connecting structure overcomes the defects in the prior art, the cantilever rotor positioning ring is matched with the driving positioning sleeve, the driving positioning sleeve is matched with the driving shaft rotor, the rigidity of the cantilever rotor can be ensured, the overall performance of the cantilever rotor can be kept, the machining requirement of the cantilever rotor is greatly lowered, and embedded matching of an extended shaft and the rotor is not needed any more.

Description

technical field [0001] The invention relates to the technical field of Roots pumps, in particular to a connection structure of a cantilever shaft or a rotor using a rotor hybrid cantilever structure or a cantilever structure for Roots vacuum pumps, Roots blowers, screw vacuum pumps and multi-stage dry vacuum pumps. In particular, it relates to a cantilever connection structure for a Roots pump or a screw pump. Background technique [0002] Most of the traditional Roots vacuum pumps, Roots blowers, screw vacuum pumps and other types of multi-stage dry vacuum pumps adopt a non-cantilever structure, that is, the impeller in the pump chamber and the two ends of the shaft are respectively supported by bearings and realize rotation. . The biggest advantage of this traditional mode is that the weight of the rotor is evenly distributed on the bearings at both ends, and the bearings at both ends are fixed in the bearing cavity, so the stability of the intermediate rotor and the mini...

AI Technical Summary

Problems solved by technology

[0006] However, the biggest problem with the use of cantilever rotors is that according to the principle of the force arm, the bearing-less end of the shaft and the rotor lacks stability. When rotating at high speed, it is easy to have a huge jump, resulting in the failure of the adjacent rotors to mesh.

Moreover, the installation method of the cantilever rotor is relatively complicated. First of all, it must meet the end face clearance and the azimuth. The more common cantilever method is a through shaft, the impeller is sleeved on the shaft, and the azimuth is ensured by a key.

At this moment, the strength of the cantilever shaft and the length of the cantilever are very critical. If the cantilever is too long, all the weight of the rotor will be loaded on the shaft, and the greater the torque will be, the beating cannot be guaranteed when rotating.

And because it is a cantilever shaft, the shaft cannot use a larger diameter to meet the rigidity

So this structure must be very unstable

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