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Geometry of screw compressor rotors and their tools

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第4期12卷 310-326页

作者： nikola stosic Ian K.SMITH Ahmed KOVACEVIC Elvedin MUJIC Centre for Positive Displacement Compressors City University London

This paper presents a method of general geometrical definitions of screw machine rotors and their manufacturing *** describes the details of lobe shape specification,and focuses on a new lobe profile,which yields a larger cross-sectional area and shorter sealing lines resulting in higher delivery rates for the same tip speed.A well proven mathematical model was used to determine the optimum profile,compressor housing size,and compressor ports to achieve the superior compressors.

关键词： Geometry of screw compressors Rotor lobe profile Cutting tools

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MULTIFUNCTIONAL SCREW COMPRESSOR ROTORS

MULTIFUNCTIONAL SCREW COMPRESSOR ROTORS

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第四届压缩机与制冷国际会议

作者： nikola stosic Ian K.Smith Ahmed Kovacevic Centre for Positive Displacement Compressor Technology City University London EC1V OHB U.K. Centre for Positive Displacement Compressor Technology City University London EC1V OHB U.K. Centre for Positive Displacement Compressor Technology City University London EC1V OHB U.K.

＜正＞For many years the authors have been investigating the use of twin screw machines to fulfil both the expansion and compression. One of potential advantages of screw machines over other types of positive displacement machine is their ability to perform both the compression and expansion functions simultaneously, using only one pair of rotors, A further feature is the use of the rotors which seal on both contacting surfaces so that the same profile may be used both for the expander and the compressor sections. By using the same profile for both, the compressor and expander rotors can be machined or ground in a single cutting operation and then separated by machining a parting slot in them on completion of the lobe formation. Moreover, in such a case, by proper location of the machine ports, pressure loads and thereby, mechanical friction losses will be less than if the two functions are performed in separate machines. Fields of application of such machines are replacement of the throttle valve in refrigeration and air conditioning plants, high-pressure application, fuel cells, multistage compression or expansion and, really, any other application where simultaneous compression and expansion are required. One example of such unusual, but convenient application is the compressor capacity control by partial expanding of compressed gas.

关键词： Screw Compressor Screw Expander Compression and Expansion on one Rotor Pair

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