A CAD System for Twin-Screw Compressors

Thie paper introduc11 the theoretical atad1 aad practical application• of a cOJDpubr-aided duiga I CAD) 171hm far twia-nrew compreuora. The 171hm include• three parte: the ealeul~tion of the reometrical param1ter1 of the rotou: the • imulatioa of Ue compru1or workilir procUIIIi and Ue optimi$&tion of the design parameter• of the campreeeor. The 171tem has been uaed in the de1irn of ee,eral air aad refrireraat twia-•crew comprea1ora. Aad the reaalta are TerJ eati1factory. INTRODUCTION The demand for t•ia-ecrew campres1ora is lacrea•l•r becauae of their adTaatara• euch •• compact con•tructioa, hirh reliability aad low fibration. And the7 haTe to be deaigaed to meet Y&riou• a•are• aach 11 ''''rer operating conditiou, looger uniu life ud 1horter period of pr'odut denlopment. Howeur, the coauatioul duira 111thod c111' t maet theu demand• nry ••ll. Ia reaeat Je&rl, we h&Je •••air•d 10111 eiraificant achi1T.ment1 ia .computer eimulatioa for ecrew compr111or workiar proceaaea, new rotor profile de•ira. and de,elopmeat of 10111 apecial a•are machin••· etc. The k11 hchlloloriu hue been gruped to optimize thl coauuctioa paramehu, caculate fore·u act iar on the rotou acnratelJ, 11d match the operaiiar par1111hu rationally. A eomple~a CAD 111~em for twia-•crew compr111ora i1 lltabli1h1d. THE CAD SYSTEII Fig. 1 abo•• the main coaatructioa and flow chart of ~he eya,em. It ia 1117 to be underatood and modified because of the sof~waree in ~he 111tem are iadepeadeot relatiTely. The procram• are all prtaented in FOITIAN lauruare aad no OJ! microcompuhu. Calculatioo of Geome~rical Paramet•r• In Fig.t. the length of contact llu, ana utillnHoa coefficient, blow hole area, and en i ty nlam• are all r•om•U ical paramehu of the rotors. The calculation of theae parameters ie ~he fir1t etep to aimulate the eGIIJpre110r workiar procuua and predict rotor profi h performaaee pnlimiur i h.