Roots vacuum pump unit
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The existing Roots vacuum pumps do not have oil pumps, two-stage pumps, or three-stage pumps, and they can achieve a pressure of 10 KPa. Now, it is desired to modify them so that the pressure can reach 5 KPa; I am not sure what approach would be appropriate.
Install a backflow valve, and the pressure can be adjusted as needed.
You might not have understood what I meant, master
Sorry, I typed it wrong :) You mean to reduce stress, right? I understand, so a loop is used. Another possibility is variable frequency drive for the motor.
Add a liquid ring vacuum pump at the front, in series
How can a oil-free vacuum pump reach a pressure of 10 KPa? Why is the quality of some pumps such poor?
It is planned to connect a first-stage Roots vacuum pump, but the effectiveness remains to be confirmed
You must have entered the wrong maximum pressure value; how can a Roots pump start at 10 kPa? You can choose to replace it with a pre-pump that has a lower ultimate pressure, or add a Roots pump
There must be a primary pump; otherwise, it’s impossible to start. And 10KPa? It can be achieved quite easily; an ordinary liquid ring pump is sufficient.
For the primary pump, an air-lift pump or a water-jet pump can be used; a ZJ150 Roots pump will suffice as the main pump to meet your requirements. However, it is also necessary to take into account the system’s evaporation rate. Welcome to communicate