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A twisted-lobe Roots rotor and its design method, compressor and expander

A design method and rotor technology, applied in the direction of machine/engine, rotary piston machine, design optimization/simulation, etc., can solve the problems of single parameter, increase of twisted-blade Roots rotor profile, limited area utilization, etc. The effect of improving the area utilization coefficient, improving the thermodynamic performance, and solving the problems of miniaturization and high efficiency

Active Publication Date: 2022-01-25
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a twisted-lobe Roots rotor and its The design method and the compressor and expander can increase the parameter design space of the twisted-lobe roots rotor profile and improve the area utilization factor of the twisted-lobe roots rotor profile

Method used

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  • A twisted-lobe Roots rotor and its design method, compressor and expander
  • A twisted-lobe Roots rotor and its design method, compressor and expander
  • A twisted-lobe Roots rotor and its design method, compressor and expander

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Embodiment

[0068] A design method for a twisted-lobe Roots rotor, comprising the following steps:

[0069] 1) Determine pitch circle radius R p , the target aspect ratio and the number of teeth n. In this example, Take 1.4.

[0070] 2) Generate meshing line bus S 1 , S 1 is the arc segment L of the original arc type line 1 m 1 Corresponding meshing lines, such as Figure 4 shown. S 1 aspect ratio satisfy is the maximum diameter-to-spacing ratio when the tooth curve just does not produce undercutting phenomenon, when n=4, It can be seen that the original arc profile cannot reach the target diameter-to-spacing ratio requirements. in this example Take 1.32. Let the tangent point of the yin and yang rotor pitch circle be O p , in the coordinate system X p o p Y p Medium, L 1 m 1 Segment corresponding to meshing line S 1 parametric equation for:

[0071]

[0072] in, is the arc segment L 1 m 1 The tooth curve equation, is the corresponding meshing a...

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Abstract

A twisted-lobe Roots rotor and its design method are the same as those of a compressor and an expander, including a female rotor and a male rotor with the same structure, and a single-tooth profile A of the end surface profile of the female rotor 1 B 1 C 1 D. 1 E. 1 f 1 G 1 h 1 I 1 The arc segments A connected in sequence 1 B 1 , compound curve segment B 1 C 1 , compound curve segment C 1 D. 1 , arc segment D 1 E. 1 , arc segment E 1 f 1 , compound curve segment F 1 G 1 , compound curve segment G 1 h 1 , arc segment H 1 I 1 Composed; the complete profile line consists of a single tooth profile around the origin of the rotor profile line O 1 Rotate and then connect end to end, and repeat n times to form, n represents the number of teeth of the profile; the two rotors can achieve correct meshing during the process of rotating and meshing. The invention also provides a design method of the twisted-lobe Roots rotor and a compressor and an expander using the rotor. The invention overcomes the shortcoming of insufficient design parameter space of the original twisted-lobe Roots profile, breaks through the value limitation of the diameter-to-distance ratio of the original profile, and improves the area utilization factor.

Description

technical field [0001] The invention belongs to the field of rotor design, and in particular relates to a twisted-lobe Roots rotor, a design method thereof, a compressor and an expander. Background technique [0002] Twisted-lobe Roots compressor is a rotary compressor. Its core components are two intermeshing rotors. Through the synchronous rotary motion of the two rotors, the process of suction, compression and exhaust is completed. The compressor has many advantages such as high speed, low noise, reliable operation, and simple processing. It is mostly used in medium and low pressure gas transportation occasions, especially in petrochemical, pharmaceutical, electronics, and aerospace fields. [0003] The profile line of the rotor end surface of the twisted lobe Roots compressor has a significant impact on the performance of the whole machine. At present, the commonly used end face shape line is arc-arc envelope line type, such as figure 1 As shown, its main parameters ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C29/00F04C18/12G06F30/17G06F30/28F01C1/12F01C21/08
CPCF04C18/082F04C18/126G06F30/17G06F30/28F01C1/082F01C1/126F01C21/08F04C2240/20F04C2250/20
Inventor 韦炜何志龙李丹童孙崇洲王嘉辰
Owner XI AN JIAOTONG UNIV
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