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US 2019/0376515 A1Published application
Multi-stage rotary lobe pump
AssigneeLeybold Aktiengesellschaft
InventorDieter Kolvenbach
Life of this patent
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Abstract
A multistage Roots pump comprise a plurality of pump chambers in a pump housing. They constitute respective pump stages, wherein each pump stage comprises two two-toothed rotary pistons. The pump stages are separated from each other by partition walls. In the partition walls essentially radially extending connecting ducts are arranged. The connecting ducts are connected with an inflow chamber whose inflow opening has a larger cross-section than the connecting ducts.
Claims19
A multistage Roots pump, comprising
- a plurality of pump chambers defined by a pump housing in which pump chambers two two-toothed rotary pistons are arranged for configuring a pump stage,
- partition walls separating said adjacent pump stages from each other, and
- connecting ducts arranged in said partition walls and connecting said adjacent pump stages with each other,
- wherein said connecting ducts are connected with an axial inflow chamber into which the delivered medium flows from said pump chamber of a pump stage through an inflow opening, and
- wherein said inflow opening has a larger cross-section than said connecting duct.
2 more elements
Dependencies are inferred from the claim text.