Orbital pump with reinforcing ring

A pump (1) for delivering a liquid, comprising:

• a pump housing (2) having at least one inlet (3), at least one outlet (4) and an inner circumferential face (13);
• a drive shaft (45) defining a geometric axis (23) and axial direction (24) of the pump (1);
• an eccentric (5) arranged within the pump housing (2), the eccentric (5) being movable in eccentric fashion relative to the pump housing (2) about the geometric axis (23), the eccentric (5) having an outer face (6);
• a deformable element (7) arranged in a pump gap (11) between the inner circumferential face (13) of the pump housing (2) and the outer face (6) of the eccentric (5);
• and
• a delivery duct (8) extending from the at least one inlet (3) to the at least one outlet (4) by the deformable element (7) and by the inner circumferential face (13) of the pump housing (2),
• wherein the deformable element (7) is pressed against the pump housing (2) along at least one section (14) of the delivery duct (8) by the outer face (6) of the eccentric (5) such that at least one displaceable seal (9) of the delivery duct (8) and at least one closed pump volume (10) are formed in the delivery duct (8), the at least one displaceable seal (9) and the closed pump volume (10) being displaceable along the delivery duct (8) from the inlet (3) to the outlet (4) by a movement of the eccentric (5) for the delivery of the liquid, and
• wherein the pump (1) has a stiffening ring (28) on the deformable element (7), and wherein a first coefficient of thermal expansion of the stiffening ring (28) is lower than a third coefficient of thermal expansion of the pump housing (2).