Research On A New Type Of Rotary Vacuum Pump

Rotary vane vacuum pump is an elementary equipment in vacuum technology, and is applied in many fieds. It can be either singly used to get low vacuum, or combined with other rough or fine vacuum pumps as backing pump. Compared with the other vacuum pumps, the rotary vane vacuum pump has the advantages in miniature, light weight, low noise and minimum vibration. In present, rotary vane vacuum pump has come into wide use in many fields, such as Metallurgy, Machinery Manufacturing, Electronic and Chemical industry Etc.The inside of cylinder was called as stator profile and it can effect vane's transport. The paper reseached stator profile of rotary vane vacuum pump by mathematics, analyzed of the equation of stator profile for the rotary vane vacuum pump. So stator profile is one of the key design for the rotary vane vacuum pump.In this paper, the structure of rotary vacuum pump is first described, then analys the effect factor of the rotary vane pump's performance. The main problems of present products are described in detail, which include ultimate vacuum, pumping efficiency, noise, oil injection, etc. By analyzing these problems, the solving plans and the design target are given. Secondly, Come up with the problem of pumping speed,the new construction method of stator curve and the new structure of rotary Vane vacuum pump are given. The mathematic model of new curve isdetermined and the mathematical eqution on the calculation of the sectional area of the working chamber is given too, conclude the evolution of the sectional area of the working chamber with rotation angle. Summarized the relationships between pumping speed and rotor diameter. The vacuum pump's pumping speed and motion characteristics are analyzed, it is compared with the old curve to determine the feasibility of the new stator curve. Lastly, set up the math model of the vacuum pump 's practical working process, which is using the first thermodynamics law and the conservation of mass.