Rotary pump with deformable pump ring

Patent metadata

Field	Value
Publication number	US-10677059-B2
Application number	US-201615557125-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Apr 29, 2015
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

The invention relates to a pump device ( 10 ) for pumping a fluid ( 13 ), comprising: a pump housing ( 12 ) having an annular portion ( 22 ); a pump ring ( 14 ), which is deformable and defines an annular pump chamber ( 57 ) at least in some portions; a first connection ( 51 ) and a second connection ( 52 ), said first connection ( 51 ) and said second connection ( 52 ) being in fluid communication with the pump chamber ( 57 ); an eccentric ( 18 ), which is designed to be rotatable relative to the pump housing ( 12 ) and which is arranged such in the pump device ( 10 ) that the eccentric ( 18 ), depending on a current rotational position of the eccentric ( 18 ), deforms the pump ring ( 14 ) in such a way that the pump ring ( 14 ) presses at least partially against the annular portion ( 22 ) in order to pump, by way of a rotation of the eccentric ( 18 ), the fluid ( 13 ) along the pump chamber ( 57 ) from the first connection ( 51 ) to the second connection ( 52 ) depending on the current rotational position of the eccentric; and a clamping element ( 114 ), which is designed to statically press the pump ring ( 14 ) against the annular portion ( 22 ) of the pump housing ( 12 ) in a clamping link region ( 45 ). The pump ring ( 14 ) has at least one recess ( 47 ) for accommodating at least part of the clamping element ( 114 ), said recess ( 47 ) being dimensioned such that in each rotational position of the eccentric ( 18 ) at least in some portions a distance ( 48 ) between the radially inner side ( 50 ) of the clamping element ( 114 ) and the pump ring ( 14 ) is provided.

First claim

The invention claimed is:

1. Pump device ( 10 ) for pumping a fluid ( 13 ), with
a pump housing ( 12 ) comprising an annular portion ( 22 ),
a pump ring which is deformable and defines an annular pump chamber ( 57 ), at least in some portions,
a first connection ( 51 ) and a second connection ( 52 ), said first connection ( 51 ) and said second connection ( 52 ) being in fluid communication with the pump chamber ( 57 ),
an eccentric ( 18 ) which is configured to be rotatable relative to the pump housing ( 12 ) and which is arranged in the pump device ( 10 ) such that, depending on a current rotational position of the eccentric ( 18 ), the eccentric ( 18 ) deforms the pump ring ( 14 ) in such a way that the pump ring ( 14 ) presses at least partially against the annular portion ( 22 ) in order, by way of a rotation of the eccentric ( 18 ), to pump the fluid ( 13 ) along the pump chamber ( 57 ) from the first connection ( 51 ) to the second connection ( 52 ) depending on the current rotational position of the eccentric, and
a clamping element ( 114 ) which is configured to statically press the pump ring ( 14 ) against the annular portion ( 22 ) of the pump housing ( 12 ) in a clamping element region ( 45 ),
wherein the pump ring ( 14 ) has at least one recess ( 47 ) for accommodating at least part of the clamping element ( 114 ),
said recess ( 47 ) being dimensioned such that, in each rotational position of the eccentric ( 18 ), a distance ( 48 ) is provided, at least in some portions, between the radially inner side ( 50 ) of the clamping element ( 114 ) and the pump ring ( 14 ).

2. Pump device according to claim 1 , wherein a volume of the recess ( 47 ) in a region between the radially inner side ( 50 ) of the clamping element ( 114 ) and the pump ring ( 14 ) changes during each rotation as a function of a current rotational position of the eccentric.

3. Pump device according to claim 1 , wherein the pump chamber ( 57 ) is formed between the pump ring ( 14 ) and the annular portion ( 22 ).

4. Pump device according to claim 1 , wherein the clamping element ( 114 ) is configured to press at least a part of the pump ring ( 14 ) in the clamping element region ( 45 ) between the first connection and the second connection statically against the annular portion ( 22 ) and, in consequence, to reduce or prevent a fluid flow between the first connection and the second connection via the clamping element region ( 45 ).

5. Pump device according to claim 1 , wherein
a pump ring support ( 16 ) is firmly connected with the pump ring ( 14 ) and has at least one pump ring support recess ( 49 ) in a circumferential region of the at least one recess ( 47 ) of the pump ring ( 14 ).

6. Pump device according to claim 5 , wherein the at least one pump ring support recess ( 49 ) is configured such that the clamping element ( 114 ) engages, at least in predetermined rotational positions of the eccentric ( 18 ), in the at least one pump ring support recess ( 49 ).

7. Pump device according to claim 5 , wherein
the at least one pump ring support recess ( 49 ) is rounded at respective ends of the pump ring support recess ( 49 ).

8. Pump device according to claim 1 , wherein
the clamping element ( 114 ) is supported on the pump housing ( 12 ) on both axial sides of the pump ring ( 14 ).

9. Pump device according to claim 1 , wherein the clamping element ( 114 ) is, at a first axial end ( 117 ), chamfered on the radially outer side ( 121 ), in order to make it possible to introduce the clamping element ( 114 ) into the recess ( 47 ) in a material-friendly manner.

10. Pump device according to claim 1 , wherein the clamping element ( 114 ) is, at a first axial end ( 117 ), chamfered on the radially inner side ( 122 ) in order to make possible a gradual alignment of the clamping element ( 114 ) on the pump housing ( 12 ) when pushing in the clamping element ( 114 ).

11. Pump device according to claim 1 , wherein
the clamping element ( 114 ) has a conical cross section, a curved outer surface and/or a radial outer surface adjacent respective points of contact with the pump ring ( 14 ).

12. Pump device according to claim 1 , wherein
the radially outer sides of the clamping element ( 114 ) are rounded off and/or curved adjacent respective points of contact with the pump ring ( 14 ).

13. Pump device according to claim 1 , further comprising
a drive ( 140 ) which is configured to rotate the eccentric ( 18 ) in such a way that the fluid ( 13 ) is transported along the pump chamber ( 57 ) from the first connection ( 51 ) to the second connection ( 52 ).

14. Pump device according to claim 1 , wherein
the recess ( 47 ) has a contour in the region radially within the clamping element ( 114 ) which includes a bulge ( 53 ) in both circumferential directions.

15. Pump device according to claim 1 , wherein the stiffness of the pump ring ( 14 ) in the clamping element region ( 45 ) is less than in the region outside of the clamping element region ( 45 ), in order to facilitate a positioning of the eccentric ( 18 ) relative to the clamping element region ( 45 ).

16. Pump device according to claim 1 , which is in fluid communication with an exhaust gas treatment system ( 130 ) of an internal combustion engine.

17. Pump device ( 10 ) for pumping a fluid ( 13 ), with
a pump housing ( 12 ) comprising an annular portion ( 22 ),
a pump ring which is deformable and defines an annular pump chamber ( 57 ), at least in some portions,
a first connection ( 51 ) and a second connection ( 52 ), said first connection ( 51 ) and said second connection ( 52 ) being in fluid communication with the pump chamber ( 57 ),
an eccentric ( 18 ) which is configured to be rotatable relative to the pump housing ( 12 ) and which is arranged in the pump device ( 10 ) such that, depending on a current rotational position of the eccentric ( 18 ), the eccentric ( 18 ) deforms the pump ring ( 14 ) in such a way that the pump ring ( 14 ) presses at least partially against the annular portion ( 22 ) in order, by way of a rotation of the eccentric ( 18 ), to pump the fluid ( 13 ) along the pump chamber ( 57 ) from the first connection ( 51 ) to the second connection ( 52 ) depending on the current rotational position of the eccentric, and
a clamping element ( 114 ) which is configured to statically press the pump ring ( 14 ) against the annular portion ( 22 ) of the pump housing ( 12 ) in a clamping element region ( 45 ),
wherein the pump ring ( 14 ) has at least one recess ( 47 ) for accommodating at least part of the clamping element ( 114 ),
said recess ( 47 ) being dimensioned such that, in each rotational position of the eccentric ( 18 ), a distance ( 48 ) is provided, at least in some portions, between the radially inner side ( 50 ) of the clamping element ( 114 ) and the pump ring ( 14 ),
wherein the recess ( 47 ) has a contour in the region radially within the clamping element ( 114 ) which includes a bulge ( 53 ) in both circumferential directions, and
wherein the contour of the recess ( 47 ) in the region radially within the clamping element ( 114 ) has a greater maximum dimension ( 141 ) in a circumferential direction than the radial dimension ( 142 ) of the radially inner side ( 50 ) of the clamping element ( 114 ).

18. Pump device according to claim 16 , wherein
the pump housing ( 12 ) has a snap-locking element ( 27 ) which is configured to snap into engagement on introduction of the clamping element ( 114 ) into the pump housing ( 12 ) and to secure the clamping element ( 114 ) axially.

Assignees

• Ebm Papst St Georgen Gmbh & Co Kg
• Ebm—Papst St Georgen Gmbh & Co Kg

Inventors

• Ghodsi-Khameneh Hassan
• Hahn Alexander

Classifications

• F01N3/10

  by thermal or catalytic conversion of noxious components of exhaust · CPC title

• F04C2240/30

  Casings or housings · CPC title

• F01N2610/1433

  Pumps · CPC title

• F01C5/02 Primary

  the resiliently-deformable wall being part of the inner member, e.g. of a rotary piston · CPC title

• F04C2210/1083

  Urea · CPC title