Method of making a centrifugal pump impeller
AssigneeBühler Motor GmbH
InventorHarald Rausch
Life of this patent
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Abstract
A method for producing a centrifugal pump impeller having a base plate, which is a single piece with pump blades and a cover plate, which consists of a thermoplastic material, wherein contact areas are available, which are heated and melted by means of ultrasonic excitation and form a close bonded connection after cool-down. The objective of the invention is to ensure inherent stability with the individual parts and a simple and reliable pre-assembly as well as a fixed mechanical connection, wherein only a small amount of excitation energy is required, with a centrifugal pump impeller comprising a base plate and cover plate.
Claims16
A method for producing a centrifugal pump impeller that has a base plate, which is a single piece with multiple pump blades each having a minimum wall thickness d1 and a cover plate consisting of thermoplastic material, with the cover plate having meltable ribs with a maximum width d2 at its base, the ribs being aligned with the pump blades and are significantly narrower at their ends facing the pump blades than at their base and the maximum width d2 of the ribs is significantly smaller than the minimum wall thickness d1 of the pump blades, the method comprising the steps of:
- providing a base plate;
- providing a cover plate;
- aligning the cover plate with respect to the base plate;
- placing a sonotrode at the cover plate and pressing it against the base plate;
- creating friction heat in the contact areas between the ribs and the pump vanes, thus melting the ribs;
- feeding of the cover plate in the direction of the pump vanes in order to create a close connection of the areas adjacent to one another;
- and
- displacing excess material into an area between the pump vanes and the cover plate.
A method for producing a centrifugal pump impeller that has a base plate, which is a single piece with multiple pump blades each having a minimum wall thickness d1 and a cover plate consisting of thermoplastic material, with the cover plate having meltable ribs with a maximum width d2 at its base, the ribs being aligned with the pump blades and are significantly narrower at their ends facing the pump blades than at their base and the maximum width d2 of the ribs is significantly smaller than the minimum wall thickness d1 of the pump blades, the method comprising the steps of:
- providing a base plate;
- providing a cover plate;
- aligning the cover plate with respect to the base plate;
- placing an oscillation excitation device at the cover plate and pressing it against the base plate;
- creating friction heat in the contact areas between the ribs and the pump vanes, thus melting the ribs;
- feeding of the cover plate in the direction of the pump vanes in order to create a close connection of the areas adjacent to one another;
- and
- displacing excess material into an area between the pump vanes and the cover plate.
Dependencies are inferred from the claim text.