Adopt an outside box a type,can move two wing types,inhale lubricant automatically,reduce wear away,keep a long-last high vacuum,efficiency high,the physical volume is small,the horse power is few.

採用外箱型，可動兩翼式，自動吸入潤滑油，減少磨損，保持長久高真空度、效率高、體積小、馬力少。