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A conical screw rotor and its twin screw vacuum pump

A conical screw and rotor technology, used in rotary piston pumps, pumps, pump components, etc., can solve the problem of small exhaust volume, no suction volume, and no maximum increase in the internal volume ratio of the screw rotor and pumping speed. and other problems, to achieve the effect of reducing exhaust volume, compact structure and short axial dimension

Inactive Publication Date: 2017-11-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent (CN101351646A) discloses a conical screw rotor. In order to increase the internal volume ratio of the screw rotor, the outer diameter of the screw rotor is larger on the low-pressure side end face, and the outer diameter of the screw rotor is smaller on the high-pressure side end face. A large internal volume ratio is achieved within a short axial dimension; the screw rotor proposed in the above patent does not achieve the maximum suction volume and the minimum exhaust volume, that is, it does not maximize the internal volume ratio and pumping speed of the screw rotor

Method used

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  • A conical screw rotor and its twin screw vacuum pump
  • A conical screw rotor and its twin screw vacuum pump
  • A conical screw rotor and its twin screw vacuum pump

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] Such as figure 1 Shown is the cross-sectional profile and axial distance diagram of the conical screw rotor, the conical screw rotor consists of the suction section L 1 , Compression section L 2 and exhaust section L 3 Composition, suction section L 1 , Compression section L 2 and exhaust section L 3 The range of the helical expansion angle τ is 0≤τ≤τ a , τ a ≤τ≤τ b and τ b ≤τ≤τ c ;Inspiratory section L 1 and exhaust section L 3 For equal pitch, suction section L 1 and exhaust section L 3 Compression section L is used between 2 Make transition, compression segment L 2 It is a variable pitch; the formulas of the axial distance H(τ) and the pitch P(τ) of the screw rotor are as follows:

[0040]

[0041] Among them, τ is the helix expansion angle, rad; for the whole screw rotor, the value range of the helix expansion angle τ is 0≤...

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Abstract

The invention discloses a conical screw rotor and a double-screw vacuum pump thereof and belongs to the field of dry double-screw vacuum pumps. The conical screw rotor comprises a suction section, a compression section and an exhaust section, wherein molded lines of cross sections of the suction section, the compression section and the exhaust section change continuously along spiral spread angles; the molded lines with uniform pitches and uniform cross sections are adopted in the suction section and the exhaust section of the conical screw rotor, the molded lines with variable pitches and variable cross sections are adopted in the compression section of the conical screw rotor; spiral spread directions of a main screw rotor I and an auxiliary screw rotor II are opposite; the main screw rotor I and the auxiliary screw rotor II can be meshed correctly at work; the screw rotor can form a big suction volume and a small exhaust volume in a short axial dimension, thus the inner volume ratio of the screw rotor is improved to the maximum degree. The screw rotor has the advantages of high inner volume ratio, compact structure, short axial dimension and low processing difficulty, and improves the limit vacuum degree and the pumping speed of the double-screw vacuum pump.

Description

technical field [0001] The invention relates to a dry twin-screw vacuum pump, in particular to a conical screw rotor suitable for the dry twin-screw vacuum pump and the twin-screw vacuum pump. Background technique [0002] Dry twin-screw vacuum pump is a positive displacement vacuum pump, which has the advantages of large gas volume, compact structure, high reliability, long life and good dynamic balance. It is widely used in chemical, pharmaceutical, semiconductor and food industries; the screw rotor is a dry type The core component of the twin-screw vacuum pump, the sealing performance, efficiency, and area utilization coefficient of the screw rotor directly affect the pumping speed and ultimate vacuum of the twin-screw vacuum pump. [0003] Patent (CN101351646A) discloses a conical screw rotor. In order to increase the internal volume ratio of the screw rotor, the outer diameter of the screw rotor is larger on the low-pressure side end face, and the outer diameter of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C18/16
CPCF04C18/084F04C18/16F04C2250/201
Inventor 王君刘宏杰张凌红
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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