PUMP DEVICE

• US 20200132065A1
• Filed: 06/12/2018
• Published: 04/30/2020
• Est. Priority Date: 07/21/2017
• Status: Active Grant

• Current Assignee: Ebm-Papst St Georgen GmbH & Company KG (Ebm-Papst Mulfingen GmbH & Company KG)
• Original Assignee: Ebm-Papst St Georgen GmbH & Company KG (Ebm-Papst Mulfingen GmbH & Company KG)
• Inventors: GHODSI-KHAMENEH, Hassan, HAUER, Daniel, LAUFER, Wolfgang, BRAXMAIER, Markus
• Granted Patent: US 11,306,710 B2
• Time in Patent Office: Days
• CPC Class Codes: F01C 5/02 the resiliently-deformable wall being part of the inner member, e.g. of a rotary piston
• CPC Class Codes: F04B 43/08 having tubular flexible members F04B43/12 takes precedence
• CPC Class Codes: F04B 43/123 using an excenter as the squeezing element
• CPC Class Codes: F04C 2210/1083 Urea
• CPC Class Codes: F04C 2240/30 Casings or housings
• CPC Class Codes: F04C 5/00 Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable such pumps specially adapted for elastic fluids F04C18/00

Abstract

A pump device (10) for pumping a fluid, having a hydraulic enclosure (12) that comprises an annular section, a pump ring (14) that is deformable and which defines an annular pump chamber at least in certain regions, a pump ring carrier (16) that is solidly connected to the pump ring (14), a first connector and a second connector, which first connector and which second connector are in fluid communication with the pump chamber, wherein the pump device (10) is set up in such a way that at least one measure influences a parking position of an eccentric (18) such that said parking position is preferred in the region of a clamping member (114), the measure being selected from: a) at least one recess in the hydraulic housing, which recess locally widens the chamber for the pump ring (14) in the axial direction, b) a geometry of the pump ring carrier (16), in which the pump ring carrier (16) has an enlarged diameter on its inner side facing the eccentric (18) in the angular region of the clamping member (114), and c) a geometric configuration of the pump ring (14), which, in the non-installed state of the pump ring (14), provides in one region at least a reduced strength of the pump ring (14), said region being in the clamping member region in the installed state of the pump ring (14), resulting in a reduced axial pressing action of the pump ring (14) in the clamping member region.

Claims

1. A pump device (10, 500) for pumping a fluid,

having a hydraulic enclosure (12, 200, 508) that comprises an annular section, a pump ring (14, 400, 506) that is deformable and defines an annular pump chamber (57) at least in certain regions,

a pump ring carrier (16, 300, 504) that is solidly connected to the pump ring (14), a first connector (51) and a second connector (52), which first connector (51) and which second connector (52) are in fluid communication with the pump chamber (57),

an eccentric (18, 502), which must be driven by a shaft (20) defining an axial and a radial direction such that the eccentric (18, 502) is rotatable relative to the hydraulic enclosure (12, 200, 508), wherein the eccentric (18, 502) is arranged in the pump device (10, 500) in such a manner that the eccentric (18, 502) deforms the pump ring (14, 400, 506) as a function of a current rotating position of the eccentric (18, 502) in such a manner that the pump ring (14, 400, 506) presses against the annular section (22) at least in certain regions in order to convey the fluid along the pump chamber (57) from the first connector (51) to the second connector (52), depending on the current rotating position of the eccentric (18, 502), by rotating the eccentric (18, 502),

a clamping member (114), designed to statically press the pump ring (14, 400, 506) against the annular section (22) of the hydraulic enclosure (12, 200, 508) in a clamping member region (45),

wherein the pump device (10, 500) is adapted such that by way of at least one measure, a parking position of the eccentric (18, 502) is affected such that it is preferred in the region of the clamping member (114), the measure being selected from:

a) at least one recess (202) in the hydraulic enclosure (12, 200, 508) that locally widens the space for the pump ring (14, 400, 506) in the axial direction,

b) a geometry of the pump ring carrier (16, 300, 504) that is such that the pump ring carrier (16, 300, 504) features an enlarged diameter (304) on its interior side facing the eccentric (18, 502) in the angular region of the clamping member (114), and

c) a geometric configuration of the pump ring (14, 400, 506) which provides at least for a reduced strength of the pump ring (14, 400, 506) in one region in the non-installed state of the pump ring (14, 400, 506), this region being in the clamping member region (45) in the installed state of the pump ring (14, 400, 506), resulting in a reduced axial pressing action of the pump ring (14, 400, 506) in the clamping member region (45).

2. A pump device according to claim 1, in which measure a provides for the at least one recess (202) in the hydraulic enclosure (12, 200, 508) to be graded.

3. A pump device according to claim 1, in which measure a provides for the at least one recess (202) in the hydraulic enclosure (12, 200, 508) to be continuous.

4. A pump device according to claim 1, in which the measure a) provides that the at least one recess (202) in a convex area (204) of the hydraulic enclosure (12, 200, 508) is provided.

5. A pump device according to claim 1, in which the measure a) provides that two recesses (202) are provided, and are provided opposite in the axial direction in the hydraulic enclosure (12, 200, 508).

6. A pump device according to claim 1, in which the measure b) provides that the pump ring carrier (16, 300, 504) features an enlarged diameter on its outer side facing the eccentric (18, 502) in the angular region of the clamping member (114).

7. A pump device according to claim 1, in which the measure c) provides that the pump ring (14, 400, 506) is embodied such that it features an asymmetrical mound in its non-installed state.

8. A pump device according to claim 1, in which the clamping member (114) is designed to statically press at least a portion of the pump ring (14, 400, 506) against the annular section (22) in the clamping member region (45) between the first connector (51) and the second connector (52), and as a result to reduce or prevent a flow of fluid between the first connector (51) and the second connector (52) via the clamping member region (45).

9. A pump ring for a pump device (10, 500), in particular a pump device (10, 500) according to claim 1, in which the pump ring (14, 400, 506) provides for a reduced strength of the pump ring (14, 400, 506) in one region, said region being in the clamping member region (45) in the installed state of the pump ring (14, 400, 506), resulting in a reduced axial pressing action of the pump ring (14, 400, 506) in the clamping member region (45).

10. A pump ring according to claim 9, featuring an asymmetrical mound.