Precision gears Cut Pump Noise

High-pressure hydraulic pumps are known to create a significant amount of noise within pumping systems. Designers are working on ways to reduce the amount of noise these pumps make. Noise comes from two major sources, mechanical operation and pressure pulsations. The article discusses how to reduce the impact of the noisy, energy wasting pressure pulsations. Formerly, pressure pulsations have been reduced by using expensive pump enclosures, using pipes instead of hoses, or adding attenuators. However, a new pump is now available that eliminates the need for these work-around solutions. The new continuous-contact pumps have special rotor profiles that help balance internal forces better. This design differs from conventional pumps which compress fluid between the gears to create sharp rises in pressure. The continuous-contact pump is a hybrid screw pump that does not create the sharp pressure rises. The screws keep the fluid moving at a path parallel to the axes of rotation and therefore the noise created by pressure pulsations is reduced. Screw type pumps are not generally rated for high pressures, however the design of this pump allows for pressures of 240-280 bar.  Read the full article at Machine Design.  

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