How to choose roots vacuum unit

How to choose roots vacuum unit?

How to choose a good roots vacuum machine? What should we pay attention to? But to choose a Roots vacuum machine, you need to choose the right pressure, otherwise it will not work for the enterprise. Here is a small compilation to share the knowledge about roots vacuum machine for you.

It is very important to choose the speed ratio between roots pump and the front pump of roots pump vacuum unit. Because the compression ratio of Robo pump is very limited. This compression ratio determines the capacity of the previous pump, because the compression ratio is the inverse ratio of the pumping speed of the two pumps. Generally, the compression ratio is within 2-10. In addition, we should consider the requirements of pre pumping time. Vacuum equipment is used as auxiliary equipment in all kinds of mechanical equipment. If the normal working time is much longer than the pre pumping time, a smaller front stage pump can be selected (the compression ratio can be larger). If the vacuum is larger and it is required to pre pump quickly, a larger front stage pump will be used. Sometimes, in order to give full play to the efficiency of the equipment, a larger pre pumping pump is installed in front of the unit, which is stopped after normal operation, and maintained by a smaller pre pump, so as to save power. How to choose roots vacuum unit?

The requirements for the ultimate pressure of Roots vacuum pump unit are also necessary to be considered when selecting the front stage pump. The high requirements for the ultimate vacuum degree (up to 1 × 10-3 PA ~ 1 × 10-2 PA pressure) generally select the two-stage rotary vane oil seal mechanical pump or two-stage sliding Yan mechanical pump as the front stage pump. The mechanical pump with single-stage oil seal can be used as the front pump when the limit vacuum is between (1 × 10-2Pa ~ 1 × 10-1pa), and the reciprocating vacuum pump or liquid ring vacuum pump can be used as the front pump when the limit vacuum is between 133 ~ 1333pa.

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