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Sectional variable-section screw rotor

A segmented, variable cross-section technology, applied in the direction of rotary piston pumps, rotary piston machines, machines/engines, etc., can solve problems such as insufficient interstage sealing performance, insufficient suction volume, and reduced ultimate vacuum degree , to achieve the effect of broadening the application range and field and improving the internal volume ratio

Pending Publication Date: 2019-09-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

[0003] Chinese patent, publication number CN105971877A, discloses a conical screw rotor and its twin-screw vacuum pump; it is characterized in that: the two screw rotors of the twin-screw vacuum pump are segmented, and the volume of the working chamber changes gradually, but the teeth on the suction side If the width is too large, the area utilization rate is not large enough, the suction volume is not large enough, the tooth width on the exhaust side is too small, and the interstage sealing performance is not high enough; this leads to the reduction of the pumping speed of the twin-screw vacuum pump, the internal volume ratio is not high enough, and the limit Reduced vacuum

Method used

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  • Sectional variable-section screw rotor
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  • Sectional variable-section screw rotor

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Embodiment Construction

[0061] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0062] Such as figure 1 Shown is a left-handed cross-sectional profile line (1001) composition graph of the left-handed screw rotor (100). The left-handed section profile (1001) of the left-handed screw rotor (100) is composed of left-handed addendum arc AB, left-handed circular involute BC, left-handed first cycloid CD, left-handed dedendum arc DE and left-handed second cycloid EA .

[0063] Such as figure 2 As shown, it is a composition curve diagram of the right-handed section profile (2001) of the right-handed screw rotor (200). The right-handed section profile (2001) of the right-handed screw rotor (200) consists of right-handed addendum arc ab, right-handed circular involute bc, right-handed first cycloid cd, right-handed root arc de and right-handed It is composed of the second cycloid ea.

[0064] At the same axial position, the radius r o...

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Abstract

The invention discloses a sectional variable-section screw rotor. A left rotation screw rotor (100) and a right rotation screw rotor (200) are arranged in sections and can be rightly engaged with eachother; screw pitch of each screw rotor has sectional continuous change; section lines have sectional continuous change; each section line is formed by five curved lines which are connected from end to end; types of the section lines are unchanged; area utilization coefficients of the section lines of two screw rotors are gradually increased from a first axial position I-I to a ninth axial position IX-IX; the volume of a formed operation cavity is gradually increased, and the center distance remains unchanged; tooth widths of the two screw rotors are small on an air absorption side; tooth widths of the two screw rotors are large on an air exhausting side; good inter-stage sealing performance is achieved. The sectional variable-section screw rotor has high pumping speed, ultimate vacuum degree and internal volume ratio under the same axial length; and the application range and the application field of the sectional variable-section screw rotor are more extensive.

Description

technical field [0001] The invention relates to a twin-screw vacuum pump, in particular to a segmented variable-section screw rotor suitable for the twin-screw vacuum pump. Background technique [0002] Twin-screw vacuum pump is a dry oil-free vacuum pump with compact structure, stable operation and wide application range. It is widely used in semiconductor, chemical, food and pharmaceutical fields. The core component of the twin-screw vacuum pump is a pair of screw rotors that mesh with each other. The characteristics of the screw rotors determine the performance of the twin-screw vacuum pump. Driven by the synchronous gear, the screw rotors rotate in different directions in the pump chamber, thereby completing the process of gas suction, pressurization and discharge, and achieving the purpose of pumping vacuum. The tooth width, pitch change mode and area utilization of the screw rotor directly determine the pumping speed, internal volume ratio and ultimate vacuum of the t...

Claims

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Application Information

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IPC IPC(8): F04C18/16F04C25/02
CPCF04C18/084F04C18/16F04C25/02F04C2240/20
Inventor 王君沙润东谈庆鹏武萌崔淑洁李宏鑫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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