Theoretical study on the pumping mechanism of a dry scroll vacuum pump

The influence of the end part of the scroll on the pumping characteristics and indicated power of the oil free scroll vacuum pump is considered. With the help of developed mathematical model of the scroll pump dependence of pumping speed on the inlet pressure at different curvature radii of the scroll end part and compression duration is obtained. The influence of compression duration on the ultimate pressure and delivery rate is examined. Dependence of the indicated power on the inlet pressure at different number of scroll wraps and compression duration is calculated. SUMMARY FIGURE 1: Types of scroll end parts; a) identical end parts; b) different end parts. a) b) VAKUUM Vol. 30 Nr. 6 Dezember 2018 ViP 25 FIGURE 7: The ultimate pressure vs compression duration at different number of scroll wraps.FIGURE 8: Delivery rate vs compression duration at different number of scroll wraps and the inlet pressure 25 kPa. Dr. Sergey Salikeev1978, mechanical engineer, Associate Professor,

Section: Mathematical Model Of the Pumpmentioning

confidence: 99%

Scroll Geometry of Scroll Vacuum Pump

Raykov¹,

Бурмистров²,

Salikeev³

et al. 2018

“…The most part of such studies involves development of mathematical models of a scroll mechanism working in regime of a scroll compressor [1][2][3][4][5]. Scroll vacuum pumps studies [6][7][8] are considerably fewer. That is why the development of mathematical model of scroll pump working process is topical.…”

Section: Problem Formulation and Assumptionsmentioning

confidence: 99%

Mathematical model of working process of oil free scroll vacuum pump

Бурмистров¹,

Salikeev²,

Raykov³

et al. 2017

Summary A mathematical model of oil free scroll machine working in vacuum conditions is considered. Differential equations and main assumptions in the model are presented. Four types of control volumes are specified. The model takes into consideration heat exchange between the pump working elements, change of clearances due to thermal deformations, and mobility of the scroll element wall in calculation of leakage. The comparison of the calculated values of the pumping speed with experimental values obtained at different rotation speed of the driveshaft is carried out.

“…Originally, such models were developed for scroll compressors [2,3]. Later on working process mathematical models were developed for scroll vacuum pumps [4,5].…”

Section: Introductionmentioning

confidence: 99%

Study of oil free scroll vacuum pump characteristics

Tyurin¹,

Бурмистров²,

Salikeev³

et al. 2020

Summary To verify the mathematical model of a scroll vacuum pump working process, an experimental unit for obtaining indicator diagrams was developed. The pump was modified to install gauges to measure quick‐varying pressures in the working chambers of the pump at different operating modes. The dependence of pressure on the rotation angle of the drive shaft at different inlet pressures is obtained. Comparison of experimental and calculated data shows convergence within 15 %.