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PUMP DEVICE

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

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