The invention relates to a pump device for pumping a liquid, comprising a hydraulics housing (12, 212), in which a pump ring (14, 214), a pump ring support (16, 216) and an eccentric (18), which can be driven by a shaft (20), are accommodated. The hydraulics housing (12, 212) has an annular portion (22, 222) and a first and a second lateral section (24, 26, 224), the two lateral sections (24, 26,224) being arranged opposite each other. The pump ring (14, 214) is mounted between the two lateral sections (24, 26, 224) of the hydraulics housing (12, 212) at least in some portions. On a side facing away from the pump ring support (16, 216), two first projections (28, 228), which run in the axial direction of the shaft (20), are each in contact with one of the two lateral sections (24, 26, 224).

The invention relates to a pump device for pumping a liquid having a hydraulics housing (12), in which a pump ring (14), a pump ring support (16), and an eccentric (18) are accommodated, which eccentric is to be driven by a shaft (20), which defines an axial and a radial direction, wherein the pump ring (14) has a first axial side (45) and a second axial side (47), wherein the hydraulics housing (12) comprises an annular portion (22) and a first and a second lateral section (24, 26), wherein the two lateral sections (24, 26) are arranged opposite each other, wherein the pump ring (14) is arranged, at least in some portions, between the two lateral sections (24, 26) of the hydraulics housing (12), and wherein on the first axial side (45) and the second axial side (47), the profile of the pump ring (14) in each case follows a contour with an S-formed curve (32) with a convex section (34) and a concave section (36), wherein the convex section (34) lies further outwards in a radial direction of the shaft (20) in comparison with the concave section (36).

The invention relates to a pump device for pumping a liquid having a hydraulics housing (12), in which a pump ring (14), a pump ring support (16), and an eccentric (18) are accommodated, which eccentric is to be driven by a shaft (20), which defines an axial and a radial direction, wherein the pump ring (14) has a first axial side (45) and a second axial side (47), wherein the hydraulics housing (12) comprises an annular portion (22) and a first and a second lateral section (24, 26), wherein the two lateral sections (24, 26) are arranged opposite each other, wherein the pump ring (14) is arranged, at least in some portions, between the two lateral sections (24, 26) of the hydraulics housing (12), and wherein on the first axial side (45) and the second axial side (47), the profile of the pump ring (14) in each case follows a contour with an S-formed curve (32) with a convex section (34) and a concave section (36), wherein the convex section (34) lies further outwards in a radial direction of the shaft (20) in comparison with the concave section (36).

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.

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.

The invention relates to a pump device for pumping a liquid, comprising a hydraulics housing (12), in which a pump ring (14) with a contact surface (46), a pump ring support (16) and an eccentric (18), which can be driven by a shaft (20), are accommodated, said shaft defining an axial and a radial direction. The hydraulics housing (12) has an annular portion (22) and a first and a second lateral section (24, 26), the two lateral sections (24, 26) being arranged opposite each other. The pump ring (14) is mounted between the two lateral sections (24, 26) of the hydraulics housing (12) at least in some portions. The profile of the contact surface (46) has a contour with a curvature that changes at least in portions, and specifically in such a way that the curvature increases at least in some portions towards the ends of the contact surface (46).

The invention relates to a pump device for pumping a liquid, comprising a hydraulics housing (12), in which a pump ring (14) with a contact surface (46), a pump ring support (16) and an eccentric (18), which can be driven by a shaft (20), are accommodated, said shaft defining an axial and a radial direction. The hydraulics housing (12) has an annular portion (22) and a first and a second lateral section (24, 26), the two lateral sections (24, 26) being arranged opposite each other. The pump ring (14) is mounted between the two lateral sections (24, 26) of the hydraulics housing (12) at least in some portions. The profile of the contact surface (46) has a contour with a curvature that changes at least in portions, and specifically in such a way that the curvature increases at least in some portions towards the ends of the contact surface (46).

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.

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.

A stator for a progressive cavity pump or motor includes a stator housing having a longitudinal axis. In addition, the stator includes a stator insert of a material moulded within the housing. The stator housing includes an outer tube having an inner surface. The stator housing also includes a plurality of framework elements disposed on the inner surface of the outer tube. Further, the stator housing includes at least one recess in the inner surface of the outer tube. The conjunction of the framework elements and the at least one recess define a plurality of chambers receiving insert material therein whereby the insert material is mechanically fixed axially, radially and torsionally within the outer tube.