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A Method of Reducing the Unbalance of Screw Rotor by Stretching and Thickening

A rotor unbalanced, rotor technology, applied in rotary piston/swing piston pump components, rotary piston pumps, rotary piston machinery, etc., can solve the problems of screw rotor corrosion, incomplete exhaust, gas backflow, etc. , to achieve the effect of improving the ultimate vacuum, reducing the unbalance, and smoothing the suction and exhaust.

Active Publication Date: 2022-02-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the destruction of the top surface of the teeth, the rotor will cause additional gaps, which will affect the ultimate vacuum that the screw pump can achieve, affect the sealing performance of the rotor, and cause uneven coating on the surface of the screw rotor, which seriously damages the rotor. Surface structure, at the same time, when pumping corrosive gas or gas containing particles, it will cause gas or debris residue at the top surface of the screw rotor teeth, which will affect the normal operation of the screw pump, and even corrode the screw rotor, reducing the screw pump life
[0005] The screw rotor also has a cavity or other similar shapes on the end face of the exhaust side, which will result in missing segments in the tooth profile of the exhaust end face, which cannot achieve a complete meshing effect, which will cause the gas to reach the end face of the exhaust side. At this time, the exhaust hole may not be opened or closed, which will cause the gas backflow in the screw rotor, and the final result will make the exhaust of the screw pump not smooth or complete during operation, which will affect the ultimate vacuum of the screw pump.

Method used

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  • A Method of Reducing the Unbalance of Screw Rotor by Stretching and Thickening

Examples

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Effect test

Embodiment 1

[0054] A method of reducing the unbalance of equal-pitch screw rotors by stretching and thickening. The end surface profile of the rotor body 6 is as follows: figure 1 As shown, it is composed of addendum circle 1, long epicycloid 2, dedendum circle 3, Archimedes spiral 4, and Archimedes spiral conjugate line 5, which is an asymmetric curve. The parameters of the screw rotor are as follows: addendum circle radius R t =78mm, root circle radius R f =30mm, the number of rotor leads m=4.5, the rotor lead is P=100mm, the total length of the rotor profile part Z=P×m=450mm, the steps are as follows:

[0055] Step 1: In figure 1 In the coordinates shown, the cross-sectional area A of the rotor end profile line 0 =0.01027034m 2 , the inertia tensor of the rotor is read out by Solidworks software as I xz =-1296181g·mm 2 , I yz =-14523069g·mm 2 , the eccentric angle of the rotor inertia tensor is calculated as

[0056]

[0057] The centroid coordinates (x 0 ,y 0 ) for x 0 ...

Embodiment 2

[0071] A method for reducing the unbalance of a gradually variable-pitch screw rotor by stretching and thickening. The end surface profile of the rotor body 6 is as follows: figure 1 As shown, it is composed of addendum circle 1, dedendum circle 3, long epicycloid 2, Archimedes spiral 4, and conjugate line 5 of Archimedes spiral, which is an asymmetrical curve. The parameters of a certain type of screw rotor are as follows: Addendum circle radius R t =78mm, root circle radius R f = 30mm, the number of rotor leads m = 4.5, the exhaust end is extended by 3.8mm for the convenience of processing, the total length of the rotor profile part Z = 318.8mm, the rotor lead gradually changes from 100mm to 40mm. Adopt the dynamic balance design method of the variable pitch rotor of the present invention, the steps are as follows:

[0072] Step 1: In figure 1 In the coordinates shown, the cross-sectional area A of the rotor end profile line 0 =0.01027034m 2 , the inertia tensor of the ...

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Abstract

The invention discloses a method for reducing the unbalance of a screw rotor by stretching and thickening. The screw rotor includes a rotor body, which is characterized in that a first thickened area and a second thickened area are processed on the rotor body, Both the first thickened area and the second thickened area are obtained by axially stretching and thickening based on the section of the rotor body where they are located. Compared with the prior art, the present invention has the following advantages: it is not necessary to punch holes on the tooth top surface of the rotor, avoiding gas leakage, and does not affect the normal meshing and gas delivery of the two rotors; Without any changes, it will not affect the normal suction and exhaust of the screw rotor; it can avoid the backflow of gas, achieve smooth suction and exhaust, and can also improve the ultimate vacuum of the screw pump.

Description

technical field [0001] The invention relates to the field of screw vacuum pumps, in particular to a method for reducing the unbalance of screw rotors by stretching and thickening. Background technique [0002] The screw vacuum pump is a kind of dry vacuum pump. When working, the two screw rotors in the pump cavity rotate synchronously and at high speed in reverse, thereby performing the process of suction and exhaust. Due to the unique structural characteristics of the screw vacuum pump, the operation process is stable and reliable, and an oil-free, clean, and high-vacuum environment can be obtained. Therefore, it is widely used in the fields of semiconductors, microelectronics, aerospace, and thin film industries. The screw vacuum pump has a compact structure, there is no direct contact between the rotor and the rotor, and between the rotor and the pump chamber, there is no friction inside and no oil lubrication and sealing are required, the leakage of the pump body clearan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C25/02F04C18/107F04C29/00
CPCF04C25/02F04C18/107F04C29/00F04C2240/20F04C2240/807
Inventor 干蜀毅李斌余清州冯绅绅高明燚舒晓冬
Owner HEFEI UNIV OF TECH
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