Posted to News on 22nd Nov 2007, 09:50
Miniature pumps deliver precise, smooth, pulse-less flows
Michael Smith Engineers is launching a new range of miniature, ultra-low-flow, positive displacement, micro annular gear pumps that are capable of dispensing a wide range of liquids with precise, smooth, pulse-less flow.
The ultra-compact HNP series pumps deliver liquids with a precision of CV
HNP micro annular gear pumps are constructed with an externally toothed internal rotor and an annular tooth external rotor, which are slightly eccentric to each other. During rotation of the rotors around their offset axis, the pumping chambers simultaneously increase on the suction side and decrease on the delivery side of the pump, resulting in a homogeneous flow rate being generated between the kidney-shaped inlet and outlet. This design principle, combined with careful material selection and high-precision manufacturing, facilitates the transfer of very low volumes with precise, smooth, pulse-less flows.
Other features and benefits include high differential pressures of up to 150bar for some models, achievable even with low-viscosity liquids, and long-service life, thanks to the use of materials such as wear-resistant tungsten carbide and ceramics.
The pumps are available in a choice of wetted materials and with various drive options; this, along with their compact size and small footprint, ensures they can be easily incorporated into the designs of many systems.
Typical applications for HNP pumps include robotics, micro-process and micro-reaction systems, analytical instrumentation, sampling, fuel cells, particle and DNA analysis, biological cell handling, ink jet printing, minimum quantity lubrication systems, aromatising, flavouring, PCB cooling and process intensification systems.
