Research On Key Technology Of Energy Saving In Vacuum System

As a means to realize automation, vacuum system has been widely used in production. There are two kinds of devices utilized to generate vacuum-vacuum pump and vacuum generator. Only under specific situations can these two kinds of devices make full use of their own advantages. At present, the selection of vacuum pump and vacuum generator are very blind. Therefore unreasonable type selection and design can lead to lower work efficiency and a widespread loss of energy. In order to overcome the two drawbacks, the selected energy criterion formula of vacuum pump and vacuum generator have been put forward after the experimental and theoretical researches on energy consumption conducted under the actual working conditions. The main research work in this paper is presented as follows:(1) Establishing the mathematical models of vacuum pump and vacuum generator respectively to research the effects of vacuum system parameters on energy consumption. The results of the stimulation of vacuum pump demonstrate that vacuum pump power Pi depends on the intake port pressure Pv, the exhaust port pressure Pout, and Pi changes in the extraction process; The results of the stimulation of vacuum generator demonstrate that vacuum generator power P2 is proportional to the supply pressure Ps, the effective throat area At1 and Pi is independent of the other parameters.(2) Building the unsteady flow volume experimental systems for vacuum pump and vacuum generator. First, experimental study on the main parameters that effect vacuum pump power P1 and vacuum generator power P2, get the the change law of Pi and P2 in different parameters; Second measure the discharge characteristic curves that determine the pumping capacity of the two different systems, providing the basic data for future study.(3) Deduing the formula of Pv and t to establish the degree of vacuum for the two different systems, and the formula indicates the maximum suction flow rate and maximum vacuum are the key parameters that affect pumping capacity of the two vacuum systems. Put forward the dimensionless number Sr to judge the influence degree of vacuum components flow resistance to the pumping capacity of the two vacuum systems. The formula of Pv and t can be used to calculate the the maximum flow rate and maximum vacuum that vacuum system should meet.(3) Building the constant volume experimental systems for vacuum pump and vacuum generator for testing the energy under actual working conditions where the TON and TOFF are different. The analysis, conclusion and summarization of the data from the experiment prove that only under the particular conditions can the two vacuum systems highlight their own advantages respectively. On top of that, the formula(based on energy consumption optimization) is first put forward to judge the selection of vacuum pump or vacuum generator is obtained. When the vacuum system work rhythm meets k>k*, choose the vacuum generator to save energy; when the vacuum system work rhythm meets k<k*, choose vacuum pump to save energy.