Roughing pump method for a positive displacement pump

摘要

In order to provide a simple and energy-efficient rough pumping method for a displacement pump (10), intended to generate a maximum differential pressure (ΔPmax) between the inlet (18) and the outlet (20) of the displacement pump (10), the rotational speed (Ω) of the displacement pump (10) is adjusted such that the maximum differential pressure (ΔPmax) to be generated that the power input (3, 4) of the displacement pump (10) approximates the minimum power (2) physically required for compressing the gas in order to establish the maximum differential pressure (ΔPmax).

主权项

1. A rough pumping method for a displacement pump, configured to generate a maximum differential pressure between an inlet and an outlet of the displacement pump, a rotational speed (Ω) of the displacement pump being adjusted to a maximum differential pressure to be generated such that a power input of the displacement pump approximates a minimum power physically required for compressing a pumped gas in order to establish the maximum differential pressure, wherein the rotational speed (Ω) for reaching the maximum differential pressure is set using a relationshipΩ=CIVS⁢(PoutPin,min-1)⁢Ωmax,wherein
VS is the compressor swept capacity of the displacement pump, CI is the back-leakage conductance within the pump, Pout is the outlet pressure of the displacement pump, Pin,min is the minimum inlet pressure of the displacement pump that is to be generated, ΔPmax=Pout−Pin,min, and Ωmax is the maximum rotational speed of the displacement pump with Ω<Ωmax.