Vacuum pump gas phase outlet
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For the gas outlet of a vacuum pump provided by a certain manufacturer, the pipe diameter is larger than that of the inlet. What is the typical pressure at the gas outlet of a vacuum pump?
When no requirement is specified, the vacuum pump outlet is at normal pressure or slightly positive pressure. So it makes little sense for the diameter of the gas outlet pipe to be larger than that of the inlet.
Thank you, I thought the same thing. However, I asked a senior chief engineer at the factory, and he said it was negative pressure.
How to vent negative pressure? The so-called vacuum pumps that cannot discharge directly into the atmosphere can usually only be used as primary pumps, requiring a pre-evacuation pump to assist with gas removal.
In my operating condition, the outlet of the vacuum pump is not connected to a vent, but rather to an exhaust gas treatment system; there is indeed a fan in that exhaust gas treatment system. However, taking into account the challenges associated with waste gas treatment, I discussed this with the client and confirmed that the vacuum pump outlet should be at a slight positive pressure.
Isn’t that quite normal? The worst thing that can happen to a vacuum pump is pressure buildup at the outlet; that’s why the outlet diameter is one size larger than the inlet diameter
Is it normal? Is it correct? I have seen vacuum systems where the outlet is smaller than the inlet, but I have never seen one where the outlet is larger than the inlet. Vacuum pumps handle compressible fluids, and depending on the compression ratio, the volumetric flow rate at the outlet is much smaller than that at the inlet. This does not take into account the reduction in gaseous material caused by the liquefaction of the condensable components. Why is a smaller volumetric flow rate requiring a larger channel area?
The outlet pressure of the Edward dry vacuum pump is not greater than 5 psi
Thank you; it’s basically at normal pressure or low pressure