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Double-screw rotor set and vacuum pump

A rotor group and twin-screw technology, applied in the direction of rotary piston pumps, pumps, rotary piston/swing piston pump components, etc., can solve the problems of weakening the working efficiency of vacuum pumps, affecting the life of screw rotors, and large wear of screw rotors , to achieve the effect of satisfying dynamic balance, prolonging life and improving shaft efficiency

Active Publication Date: 2020-10-02
NINGBO BAOSI ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the flow resistance of the gas pulsating in the shell and passing through the valve, the gas will also rub against the moving parts in the vacuum pump, so that the inhaled gas consumes more energy, which weakens the working efficiency of the vacuum pump and wears the screw rotor. Larger, which greatly affects the life of the screw rotor

Method used

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  • Double-screw rotor set and vacuum pump
  • Double-screw rotor set and vacuum pump
  • Double-screw rotor set and vacuum pump

Examples

Experimental program
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Effect test

Embodiment 1

[0022] This embodiment discloses a twin-screw rotor group, including a male rotor and a female rotor. The number of teeth of the male and female rotors is 1, and the tooth shape is trapezoidal. The male rotor and the female rotor mesh with each other. The two-stage screw rotor composed of symmetrically connected variable-pitch screws, the initial pitch of one of the variable-pitch screws in the male rotor ps=70mm , the end pitch of the variable pitch screw pe=30mm, Rotor length L=200mm, Rotor Angle t=20rad, Axial position of variable pitch screw in male rotor z1=-(1000*(p1i- ((7t 2 ) / 100+ p1i 2 ) 0.5 )) / t ,in p1i is the axial position of the variable pitch screw in the male rotor z1 The pitch of the variable-pitch screw at the position; through the symmetrical characteristics of the two-stage screw rotor, the relationship between the pitch of the male rotor and its axial position can be obtained, and the relationship between the pitch of the female rotor and its...

Embodiment 2

[0024] This embodiment discloses a vacuum pump, which includes a "∞"-shaped cylinder intersecting two circles, a motor and a gear transmission system. A male rotor and a female rotor are arranged in the cylinder. The number of teeth of the male and female rotors is 1, and the tooth shape is trapezoidal. , the male rotor and the female rotor are meshed with each other. The male and female rotors are two-stage screw rotors composed of two variable-pitch screws symmetrically connected in opposite directions. The initial pitch of one of the variable-pitch screws in the male rotor is ps=70mm , the end pitch of the variable pitch screw pe=30mm, Rotor length L =200mm, Rotor Angle t=20rad, Axial position of variable pitch screw in male rotor z1=-(1000*(p1i- ((7t 2 ) / 100 +p1i 2 ) 0.5 )) / t ,in p1i is the axial position of the variable pitch screw in the male rotor z1 The pitch of the variable-pitch screw at the position; through the symmetrical characteristics of the ...

Embodiment 3

[0027] This embodiment discloses a vacuum pump, which includes a "∞"-shaped cylinder intersecting two circles, a motor and a gear transmission system. A male rotor and a female rotor are arranged in the cylinder. Both the male and female rotors have two teeth, and the tooth shape is trapezoidal. , the male rotor and the female rotor are meshed with each other. The male and female rotors are two-stage screw rotors composed of two variable-pitch screws symmetrically connected in opposite directions. The initial pitch of one of the variable-pitch screws in the male rotor is ps=70mm , the end pitch of the variable pitch screw pe=30mm, Rotor length L =200mm, Rotor Angle t=20rad, Axial position of variable pitch screw in male rotor z1=-(1000*(p1i- ((7t 2 ) / 100 +p1i 2 ) 0.5 )) / t ,in p1i is the axial position of the variable pitch screw in the male rotor z1 The pitch of the variable-pitch screw at the position; through the symmetrical characteristics of the two-stag...

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Abstract

The invention provides a double-screw rotor set. The double-screw rotor set is composed of two screw rotors meshing with each other, and each screw rotor is formed by symmetrically connecting two sections of variable-pitch screws opposite in rotation direction; the screw pitch of each variable-pitch screw meets a formula p = (pe-ps) / L<2> * z<2>, wherein p is the screw pitch of the variable-pitch screw, ps is an initial screw pitch of the variable-pitch screw, pe is an end screw pitch of the variable-pitch screw, L is the length of the variable-pitch screw, and z is an axial position of the variable-pitch screw; the axial position of each variable-pitch screw meets a formula z = p / (2pi) * t, wherein t is a rotation angle of the variable-pitch screw; and the axial position of each variable-pitch screw further meets a formula z =-(L * ((pi<2> * L<2> + (ps<2>-pe * ps) t<2>) <0.5>)-pi * L) / ((pe-ps) * t), wherein pi is the screw pitch of the variable-pitch screw at an axial position z of thevariable-pitch screw, and pi is reduced in a quadratic relation from ps to pe. The displacement of the screw rotor in a working cycle is twice the displacement of a common single screw rotor, so thatthe air exhaust efficiency is improved.

Description

technical field [0001] The invention relates to the field of mechanical engineering design, more specifically to a twin-screw rotor group and a vacuum pump. Background technique [0002] The vacuum pump is used to extract gas from the equipment, so that negative pressure is generated in the equipment, and the final pressure is close to 0. Dry twin-screw vacuum pump is an oil-free rotary machine, which inherits the advantages of simple and compact structure, stable operation, low mechanical vibration and noise, and easy maintenance of twin-screw machinery. It is widely used in aviation, electronics, petroleum and food processing and other fields. The core component of the twin-screw vacuum pump is a pair of screw rotors that mesh with each other and rotate in opposite directions. The motor is connected to the active screw rotor, and the driven screw rotor is driven to rotate in the cylinder through the synchronous gear. The screw rotor completes the process of suction, compr...

Claims

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Application Information

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IPC IPC(8): F04C18/16F04C29/12F04C29/00
CPCF04C18/16F04C29/00F04C29/12
Inventor 张炯焱卢阳张旭云王泉超
Owner NINGBO BAOSI ENERGY EQUIP
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