# US 2014/0193247 A1 · Impeller pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0193247 A1 - Document ID: US20140193247A1 - Status: Published application - Kind: A1 - Application number: 14/148,182 - Filed: 2014-01-06 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: E.G.O. Elektro-Geraetebau GmbH - Applicants: E.G.O Elektro-Geraetebau GmbH - Inventors: Joern Friedrichs; Tobias Albert; Volker Block - Web page: https://patentgrep.com/patent/US20140193247A1 ## CPC - F04D 29/426: {especially adapted for liquid pumps} - F04D 29/586: {specially adapted for liquid pumps} - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) ## Abstract An impeller pump has a pump casing including a pump chamber and an inlet and an outlet thereon and an impeller therein, and including a heating device for heating the conveyed medium, which heating device forms an external wall of the pump chamber. The pump chamber extends annularly around the impeller and away from the pump chamber floor, wherein the outlet leads off on a region of the pump chamber which, viewed in the axial direction of the impeller pump, is pointing away from the pump chamber floor. The cross-sectional area of the pump chamber decreases in the axial direction of the longitudinal center axis of the impeller pump away from the pump chamber floor toward the outlet by virtue of an obliquely inwardly inclined external wall. ## Claims ### Claim 1 An impeller pump for the conveyance of a medium, comprising: a pump casing comprising a pump chamber and an inlet and an outlet thereon; an impeller, disposed in said pump chamber, behind said inlet and before said outlet within a conveyance path; and a heating device for heating said conveyed medium, said heating device forming at least part of an external wall of said pump chamber, wherein said impeller is arranged on a pump chamber floor and, starting therefrom, said pump chamber extends annularly around said impeller and away from said pump chamber floor, and wherein said outlet leads off on a region of said pump chamber which, viewed in an axial direction of the impeller pump, is pointing away from said pump chamber floor, and wherein a cross-sectional area of said pump chamber decreases in said axial direction of a longitudinal center axis of said impeller pump away from said pump chamber floor and toward said outlet. ### Claim 2 (depends on 1) The impeller pump according to claim 1, wherein said cross-sectional area of said pump chamber decreases monotonously in said axial direction of said longitudinal center axis of said impeller pump away from said pump chamber floor toward said outlet. ### Claim 3 (depends on 1) The impeller pump according to claim 1, wherein said decrease is uniform, with an angle of an oblique external wall of said pump chamber to said longitudinal center axis of said impeller pump from 3° to 25°. ### Claim 4 (depends on 3) The impeller pump according to claim 3, wherein said angle of said oblique external wall of said pump chamber to said longitudinal center axis of said impeller pump ranges from 5° to 15°. ### Claim 5 (depends on 1) The impeller pump according to claim 1, wherein said heating device is tubular in configuration. ### Claim 6 (depends on 5) The impeller pump according to claim 5, wherein said heating device is rotationally symmetrical to said longitudinal center axis, wherein it is configured such that it tapers conically away from said pump chamber floor. ### Claim 7 (depends on 1) The impeller pump according to claim 1, wherein a radially inner wall of said pump chamber runs straight and parallel to said longitudinal center axis of said impeller pump, and with constant radius. ### Claim 8 (depends on 7) The impeller pump according to claim 7, wherein said radially inner wall of said pump chamber has constant shape. ### Claim 9 (depends on 1) The impeller pump according to claim 1, wherein said heating device extends from said pump chamber floor to just before an axial height of said outlet and overtops said impeller in an axial direction of said outlet. ### Claim 10 (depends on 9) The impeller pump according to claim 9, wherein said heating device extends from said pump chamber floor to just before said axial height of said outlet and overtops said impeller in said axial direction away from said outlet. ### Claim 11 (depends on 1) The impeller pump according to claim 1, wherein said heating device runs around at least a major part of said pump chamber. ### Claim 12 (depends on 11) The impeller pump according to claim 11, wherein said heating device runs fully around said pump chamber. ### Claim 13 (depends on 1) The impeller pump according to claim 1, wherein heating means are provided evenly distributed on said heating device, wherein an output per unit of area of said heating means, viewed over a basic region of said heating device, is the same. ### Claim 14 (depends on 1) The impeller pump according to claim 1, wherein said heating device, on a side lying outside said pump chamber, comprises heating means. ### Claim 15 (depends on 1) The impeller pump according to claim 1, wherein said inlet reaches into said pump chamber to just before said impeller. ### Claim 16 (depends on 15) The impeller pump according to claim 15, wherein said inlet ends at less than 50% of a height of said pump chamber in said axial direction.