The objective of the research is to increase the operation efficiency of milking machine UDS-3B. The study was focused on the impact of technological and design parameters of vacuum apparatus for pasture complexes (diameter of vacuum-pipe, number of simultaneously plugged milking units, temperature of working fluid) on the operational process of the liquid-packed ring vacuum pump with a frequency converter in order to substantiate the rational combination of technological and design parameters providing automated regulation of power net frequency and therefore the frequency of the pump rotor rotation depending on the number of simultaneously plugged milking units accounting for zootechnic requirements. During the study a plant for automated regulation of power net frequency and rotation frequency of vacuum-pump rotor depending on the number of plugged milking units was developed. The results of experimental study were processed by well-known methods of math analysis using computer software. Data processing results in math model which reflects the dependence of power expending by electric motor while liquid-packed ring vacuum pump operating from the number of simultaneously plugged milking units and inside diameter of vacuum-pipe. The analysis of simulating results showed that the greatest impact on power expending by electric motor at the vacuum pump operating had the number of simultaneously plugged milking units and inside diameter of vacuum-pipe; while the number of plugged milking units decreased from six to two, the power expending by electric motor also decreased and minimal values of power were achieved at the greatest values of inside diameter of vacuum-pipe; at simultaneous plugging of two to six milking units an optimal temperature of working fluid was 20–25 °Ñ, and diameter – 0.0614 m.
Keywords: milking machine, vacuum, liquid-packed ring vacuum pump, experiment, between-blade space, rotor.
