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Micropumps for extreme pressures
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Mikrostrukturteknik.
2009 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

The objective of this thesis was to improve a paraffin actuated micropump design, to be able to pump against extreme pressures (above 100 bar). This was accomplished by initially studying the membrane activation, using video capturing. The micropump has been improved to withstand pressures high enough, to enable use in an high-performance liquid chromatography (HPLC) system. The micropump has been shown to pump against back pressures up to 150 bar, with a positive net-flow. This should be compared with the previously recorded maximum back pressure of 50 bar. The pumping against high back pressures was possible due to an increased understanding of the sealing of the membranes. This resulted in a new design that was manufactured and characterised. Without clamping the pump was measured to manage back pressures of 10 bar, and then starting to leak in a bond at the flow channel. With supporting clamping, the managed back pressures increased ten folded.

When measured on the different valves, pressure above 200 bar has been possible to withhold. Although the valves were below their maximum limit, the pressure was not possible to be further increased due to a limitation in the equipment, i.e. risk of damaging the connections. When examined after pressurised at extreme pressures (above 100 bar) several times, no signs of fatigue or damage of the membrane was seen.

A new behaviour of the valves was discovered. Above certain pressures some designs self sealed, i.e. withholding the pressure after the voltage was turned off. For these valves the pressure had to be released by some other means.

sted, utgiver, år, opplag, sider
2009. , s. 55
Serie
UPTEC Q, ISSN 1401-5773 ; 09016
Emneord [en]
Micropump, Micromechanics, Paraffin, Actuator, High-pressure pumping, Steel membrane
Emneord [sv]
Mikropump, Mikromekanik, Paraffin, Aktuator, Höga tryck, Stålmembran
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-110880OAI: oai:DiVA.org:uu-110880DiVA, id: diva2:278862
Presentation
2009-09-24, Ångström sal 4003, Uppsala, 14:15 (svensk)
Uppsök
Technology
Veileder
Examiner
Tilgjengelig fra: 2009-12-01 Laget: 2009-11-30 Sist oppdatert: 2009-12-01bibliografisk kontrollert

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