SUBSTANTIATION OF THE PARAMETERS OF VACUUM PUMPING FACILITIES WITH A PULSING ACTIVE FLOW

Abstract

Vacuum pumping devices designed for dosing, mixing, transporting and distributing feed; milking cows; milk processing and other technological processes in agriculture are among the main components of the technological processes of animal husbandry. In order to improve the technical characteristics of vacuum pumping devices, widely used in all industries, it is proposed to use a pulsating jet apparatus installed on the suction port of a liquid ring vacuum pump. To characterize a stationary flow, the reduced velocity and the Reynolds number are usually used, and in the case of a pulsating flow, the relative frequency and relative amplitude of the pulsations are added to them, which are necessary to determine the design and technological parameters. One of the main design parameters of the operation of a jet vacuum pumping device is the ejection coefficient, the increase of which is achieved by deliberately violating the stationary mode of material flow by adding a pulsating device. The object of experimental research was a jet apparatus with a pulsating active flow. As an interrupting mechanism for an ejector with a pulsating active flow, it is advisable to use a ball-shaped valve made of various materials, which, due to the pressure drop and a return spring, can pulsate at a frequency of 90 ... 100 beats/min. During the experiments, the change in the supply of a water-ring vacuum pump with a pulsating jet apparatus was determined depending on the materials of the ball-type valve (steel, rubber and textolite), the suction pressure (1; 5; 10; 20; 30; 40; 50; 60 kPa), valve pulsation frequency (85; 100; 115; 130 beats/min) and ejector inlet pressure (20; 30; 50; 60 kPa). The best result is noted when using a valve in the form of a ball made of steel. In this variant, the supply of a water ring vacuum pump with a pulsating jet apparatus is increased to 14.5 m3/min, and the maximum supply is provided at a pulsation frequency of 90...100 beats/min