Delivery pump
AssigneeSiemens Aktiengesellschaft
InventorsBernd Jäger, Peter Marx, Hans-Peter Osburg
Life of this patent
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Abstract
In a feed pump (2), guide vanes (9) fastened on a driven impeller (7) project into a recess (11) of a molding (8) annularly surrounding the impeller (7). The guide vanes (9) are located with a slight clearance opposite the wall of the recess (11). The guide vanes (9) can thereby have a particularly large surface. Moreover, a depositing of dirt in the radially outer region of the impeller (7) is avoided.
Claims3
A feed pump in particular a fuel pump, with a driven impeller (7, 24) rotating between two casing parts and carrying guide vanes delimiting at least one ring of vane chambers, with a part-annular channel arranged in the region of the vane chambers in the casing parts and extending from an inlet duct to an outlet duct, and with a fixed molding manufactured from a harder material than the impeller (7, 24) arranged on the outer circumference of the impeller, the molding having a recess adjacent to the part-annular channel, characterized in that the guide vanes (9, 30) project into the recess (11, 31) of the molding (8, 25) and are located with a slight clearance opposite the wall of the recess (11, 31).
A feed pump having a driven impeller manufactured from plastic, rotating between two casing parts and carrying guide vanes delimiting at least one ring of vane chambers, with a part annular channel arranged in the region of the vane chambers in the casing parts and extending from an inlet duct to an outlet duct and with a fixed molding arranged on the outer circumference of the impeller, the molding having a recess and in the region of the recess a wall made from metal or ceramic.
Dependencies are inferred from the claim text.