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Elliptical-arc-shaped Roots rotor

An elliptical arc and rotor technology, applied in the field of elliptical arc Roots rotors, can solve the problems of many curved segments, complicated rotor processing, and unsmooth connection of curves, etc.

Inactive Publication Date: 2016-12-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the commonly used Roots rotor profiles include arc and circular involute combined profiles, cycloid rotor profiles, and arc rotor profiles; in order to further improve its performance, the application numbers are 200610155911.7, 201310479887.2, 201310122325.2 The Chinese patent has improved the commonly used Roots rotor profile. Although the area utilization rate of the rotor has been improved after the improvement, there are problems that the curves cannot be connected smoothly and there are too many curve segments, which leads to the rotor being damaged during the working process. Increased leakage and complex rotor machining issues

Method used

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  • Elliptical-arc-shaped Roots rotor

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0050] Such as figure 1 As shown, it is the proposed elliptical arc-shaped Roots rotor diagram. The profile line of the left Roots rotor (1) is composed of four curves connected smoothly from the beginning to the end, which are as follows: the first elliptical arc segment A 1 B 1 C 1 , the first ellipse arc conjugate envelope C 1 D. 1 E. 1 , the second ellipse arc segment E 1 f 1 G 1 and the second elliptic arc conjugate envelope G 1 h 1 A 1 , which is characterized by: connection point A 1 、C 1 ,E 1 , G 1 are located on the pitch circle, ∠A 1 o 1 B 1 =∠C 1 o 1 B 1 =45°, ∠E 1 o 1 B 1 =∠G 1 o 1 B 1 =135°; the first ellipse arc segment A 1 B 1 C 1 Symmetric about the x-axis, the conjugate envelope of the first ellipse arc C 1 D. 1 E. 1 Symmetric about the y axis, the first ellipse arc segment A 1 B 1 C 1 around pitch cir...

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Abstract

The invention discloses an elliptical-arc-shaped Roots rotor, and belongs to the technical field of Roots vacuum pumps. A molded line of a left-side Roots rotor (1) is composed of four sections of curves which are in smooth connection end to end, wherein the molded line sequentially comprises: a first elliptical arc section A1B1C1, a first elliptical arc conjugated envelope curve C1D1E1, a second elliptical arc section E1F1G1 and a second elliptical arc conjugated envelope curve G1H1A1; two identical Roots rotors can realize accurate engagement in a synchronous and incongruous double-rotary movement process; the elliptical-arc-shaped Roots rotor disclosed by the invention has the advantages of good air tightness, high area utilization rate, a large range of a ratio of a rotor excircle radius R1 to a pitch radius R2 and convenience for machining.

Description

technical field [0001] The invention relates to a Roots vacuum pump, in particular to an elliptical-arc Roots rotor suitable for the Roots vacuum pump. Background technique [0002] The Roots vacuum pump is a rotary fluid machine, through which two Roots rotors that can mesh with each other perform synchronous counter-rotational double-rotational motion, and generate a vacuum at the suction end to form a pressure difference, thereby realizing the suction and discharge of gas; the Roots rotor The composition line and its conjugate meshing characteristics have a great influence on the area utilization of the rotor and the sealing performance and operating efficiency of the Roots vacuum pump. Therefore, the reasonable design of the Roots rotor line is very important. [0003] At present, the commonly used Roots rotor profiles include arc and circular involute combined profiles, cycloid rotor profiles, and arc rotor profiles; in order to further improve its performance, the appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C18/14
CPCF04C18/14F04C2240/20
Inventor 王君刘瑞青崔冬崔峰张新述赵峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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