Delivery pump
AssigneeSiemens Aktiengesellschaft
InventorsBernd Jager, 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.
Claims9
A feed pump, in particular a fuel pump, with a driven impeller 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 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).
The feed pump as claimed in at least one of the preceding claims, characterized in that the guide vanes (9, 30) project beyond an outer edge (21, 27) of the impeller (7, 24) by at least half their height.
The feed pump as claimed in at least one of the preceding claims, characterized in that the outer edge (21, 27) of the impeller (7, 24) and the radially inward-pointing edge (12, 26) of the molding (8, 25) are located with an intended clearance opposite one another.
The feed pump as claimed in at least one of the preceding claims, characterized in that the molding (8) has at least two ring elements (19, 20).
The feed pump as claimed in at least one of the preceding claims, characterized in that the impeller (24) has a two-layer configuration.
The feed-pump as claimed in at least one of the preceding claims, characterized in that the molding (8, 25) is manufactured from a harder material than the impeller (7, 24).
The feed pump as claimed in at least one of the preceding claims, characterized in that, in the case of an impeller (7, 24) manufactured from plastic, the molding (8, 25) has in the region of the recess (11, 31) a wall made from metal or ceramic.
Dependencies are inferred from the claim text.