Pulsation and noise reduction on external gear pumps
Resaerch Task/Objectives
Comparison of the pulsation resulting from SFS and DFS
External Gear Pumps (EGP) are cost effective and sturdy displacement units for multi-purpose usage. But noise generation due to the pulsating flow resulting from the pressure drop in the moving sealing of the gear is one of the most serious drawbacks. The piping system around the pump is triggered by pressure pulsation and transmits the noise further on. This leads to the need for significant noise and pulsation reduction of gear pumps.
Approach/Results
Comparison of the pulsation resulting from SFS and DFS
A Double-Flank Sealing (DFS) was developed as an effective measure to reduce noise and pressure pulsation. Thus, the pressure fluctuation could be reduced to a quarter of that magnitude which results in a single-flank-sealing (SFS) of the same pump. This significant reduction of the pulsation can be achieved by redesigning the tooth flanks in a way that the sealing contact of the teeth flanks is not only resulting by the contact of the teeth flanks of the pressure loaded tooth pair, but also by the contact of the teeth flanks of the unloaded tooth pair at the same time. The reduction of pressure fluctuations by 75%, which was found in numerical simulations (CFD) was proven experimentally.
The presented research activities are part of the project "Improvement of pressure reversing on external gear pumps by means of computational fluid dynamics (CFD)"
(Ref. No. He2715/10-1). The authors would like to thank the German Research Foundation (DFG) for the financial support.
Funded by:
