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A twin-screw vacuum pump rotor profile

A rotor profile, vacuum pump technology, applied in the direction of pumps, pump components, rotary piston pumps, etc., can solve problems such as poor sealing performance, affecting the service life of screw vacuum pumps, and long contact lines.

Active Publication Date: 2021-07-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the traditional screw vacuum pump screw rotor end surface molding lines have long contact lines, can not completely eliminate the leakage triangle, and poor sealing performance. Affect the service life of the screw vacuum pump

Method used

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  • A twin-screw vacuum pump rotor profile
  • A twin-screw vacuum pump rotor profile
  • A twin-screw vacuum pump rotor profile

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Experimental program
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Effect test

Embodiment Construction

[0021] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0022] Depend on image 3 It can be seen that the tooth profile of the screw rotor section is mainly composed of long epicycloid AB with a radius of R f The dedendum circle BC, the hoop cord CD, the hoop cord conjugate envelope DE and the radius R t Composed of addendum circle EA, and the hoop cable line and the hoop cable line conjugate envelope intersect at point D, by figure 1 , figure 2 visible image 3 The formation mechanism of each curve in .

[0023] The formation mechanism of the long epicycloid AB is: the base circle 1 and the rolling circle 2 whose radii are both the size of the pitch circle, and t...

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Abstract

The invention discloses a twin-screw vacuum pump rotor profile, which is characterized in that the rotor profile is composed of five sections of curves, which are long epicycloids AB in the counterclockwise direction, and the radius is R f The dedendum circle BC, the hoop cord CD, the hoop cord conjugate envelope DE and the radius R t The addendum circle EA, where, R t +R f =2r, r is the pitch circle radius of the screw rotor. Compared with the prior art, the present invention has the following advantages: it overcomes the deficiencies of the prior art, breaks through the limitations of existing screw vacuum pump rotor end surface profile line area utilization rate, large leakage triangle, etc., and provides a screw vacuum pump rotor end surface type The line enriches the types of screw vacuum pump rotor end surface profiles, and solves the technical problems of traditional screw rotors such as air leakage at the front and rear stages and poor sealing performance.

Description

technical field [0001] The technical field of the screw vacuum pump of the present invention particularly relates to a screw rotor profile of a twin-screw vacuum pump. Background technique [0002] Dry screw vacuum pumps are widely used because of their high pumping speed, high ultimate vacuum, no oil pollution, no friction effect due to non-contact of pumping functional parts, and ability to adapt to harsh working conditions. The screw vacuum pump relies on a pair of intermeshing screw rotors inside to engage and rotate to realize the suction, compression and exhaust process of the vacuum environment gas, so as to continuously pump the gas from the vacuum chamber to the atmosphere. The screw rotor is the core part of the screw vacuum pump, which is helically formed by the end profile. The quality of the end profile directly affects performance parameters such as pumping speed and ultimate vacuum degree of the screw vacuum pump. Most of the traditional screw vacuum pump sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C18/16F04C25/02
CPCF04C18/084F04C18/16F04C25/02F04C2240/20F04C2250/20
Inventor 干蜀毅李斌刘明昆汪亮柴晓彤刘星洲
Owner HEFEI UNIV OF TECH