Rotary pump with deformable pump ring

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).

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 maximum dimension (143) of the clamping element (114) in a circumferential direction.