SEALING FOR PUMPS
PRECISION MACHINING ACHIEVES NO-CONTACT SEALING FOR PUMPS
Precision parts supplied by Bauer Springs Ltd, are used extensively in the manufacture of vane cell pumps as widely specified within the European automotive industry. Pump assemblies comprise rotors, vanes and housings which are manufactured to dimensional tolerances of less than two microns. They are part of common-rail injection pumps used in vehicle power assisted steering, as well as fuel injection equipment where high pressures of up to 1350 bar can be experienced.
Bauer Springs have considerable experience in precision blanking and grinding, combined with a capacity for high volume production. This ensures that they are able to supply quality components, held to very close tolerance limits, for use in a wide range of engineering applications where product performance and reliability are paramount.
Christian Bauer, parent company of Bauer Springs Ltd, is claimed to be the worlds only manufacturing supplier of pump vanes to miniature dimensions. These are produced from high-speed and roller bearing grade steels, in a range of sizes, either with or without notches to suit varying rotor radii assemblies.
The clearance tolerances of the vanes moving within the rotor slots present a great production challenge, which involves precision engineering covering evenness, parallelism, both angular and dimensional stability together with surface roughness, all to be maintained within the micron range. Rotors are mounted eccentrically within a housing and the vanes, operating with pinpoint accuracy under centrifugal force and spring pressure, create a no-contact seal with the housing so that the pumps run both quietly and with high efficiency.
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