Do you know the difference between a blower and a vacuum pump?

 The blower refers to the fan whose boost pressure is 10~200kpa, usually the inlet is normal pressure, or slightly positive or negative pressure. The conveying gas is air or other medium. The range of pressure increase allowed by different blowers varies greatly. Under normal circumstances, such as the Roots blower allows a maximum pressure increase of 100kpa, the screw blower allows a pressure increase of 250kpa, and the single-stage high-speed centrifugal blower is 120kpa. The above refers to a single stage boost. Vacuum pump inlet is negative pressure, can be from gauge pressure 0 to absolute pressure 1xpa. The general working pressure of a single pump is a rough vacuum state (the working pressure is greater than 1330pa), and the establishment of a higher pressure routine requires a variety of pumps to work together. When the blower transmits different gases, different sealing methods and fluid materials should be adopted for different gas properties. The blower cannot simply be used as a vacuum pump. Due to different compression characteristics, temperature rise characteristics, sealing methods, although the blower and vacuum pump machine design principle is roughly the same, but in the details are very different. Such as gap design, strength design, sealing method, material selection, etc., should take different design ideas.