What type roots vacuum unit? _

in general, the compression of single roots vacuum pump is small, in order to make the roots vacuum unit can achieve higher vacuum degree and the extraction rate of bigger, then using many sets of roots vacuum pump and the backing pump in series roots vacuum unit to meet the requirements of high vacuum, then how roots vacuum unit selection? Under constant Chen Gong only to share knowledge about roots vacuum unit selection.

roots vacuum pump and the backing pump pumping speed ratio

roots pump vacuum unit roots pump and the backing pump of the choice of pumping speed ratio is very important. Because luo bo's pump compression ratio is limited. The compression ratio determines the capacity of pump before the more, because of the compression ratio is the inverse ratio of pumping speed. General compression ratio selection within 2 ~ 10. The other should consider requirements for drainage when asked. Vacuum equipment as auxiliary equipment used in all kinds of mechanical equipment. If the normal working hours than drainage time, smaller backing pump (optional Compression ratio is larger) If the vacuum smothering is bigger. But also for drainage, soon with larger backing pump. Sometimes in order to better play to the efficiency of the equipment, before the unit is equipped with a drainage pump, stopped it after normal work, and with smaller backing pump to maintain, this is done to save power.

2 with vacuum and work pressure should satisfy the limit of vacuum equipment vacuum and pressure requirements.

the roots vacuum pump units of extreme pressure requirement, must consider backing water pump is choice, higher requirements for ultimate vacuum ( 1 x 10 - 3 Pa ~ 1×10 - 2 pa pressure) Generally choose double rotary vane seal mechanical pump or double slide yan mechanical water pump as the backing pump. Ultimate vacuum requirement in ( 1×10- 2 pa ~ 1×10 - 1Pa) Can choose between a single stage oil seal mechanical pump as the backing pump, ultimate vacuum requirements between 133 ~ 1333 pa can choose reciprocating vacuum pump or liquid ring vacuum pump as the backing pump.

was elected with a reciprocating or thick liquid ring type vacuum pump is regarded as the backing pump of the roots vacuum pump, pumping speed of pump before 1/2 - general for roots vacuum pump 1/4, cannot too big, otherwise will make the compression ratio is too big, cause the roots vacuum pump exhaust temperature is high and can't work normally. When choosing backing pump must also consider is whether the corrosive medium in the smoke gas, whether they contain non-condensable gas, is a lot of or trace. If they contain corrosive gases. Will not be able to choose oil seal mechanical pump, oil seal mechanical pump is not suitable for pumping of contains a lot of condensable vapor gas, otherwise will soon the sealing liquid emulsification, trace of condensable vapor ejector contains gas, also must use the device with a gas ballast oil seal mechanical pump as the backing pump.

in order to obtain the low inlet pressure ( 1 - 100pa) High extraction rate, can use a roots vacuum pump as another roots vacuum pump former level 3 or 4 sets of pump, roots vacuum water pump at this time ask the pumping speed ratio generally between 2 ~ 5.

3, according to the actual working condition to choose suitable roots vacuum unit configuration.

is pumped gas composition, environment and process will have different configuration options.

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