An eccentric screw pump with a rotor, which forms a conveyor screw, and a stator, which forms a screw thread and in which the rotor circulates during a conveying operation. The stator includes a single-part or multipart stator housing, in which a stator lining made of an elastomer material is located, said lining forming the screw thread. The stator lining forms a projection at least on one side in the direction along the pump longitudinal axis, said projection protruding from the stator housing such that a free force introduction surface is formed. A force can be applied via the free force introduction surface, said force compressing the stator lining into the stator housing so that the stator lining is transversely elongated in the stator housing, leading to a constriction of the screw thread. The projection can be surrounded by a mobile support tube which is moved relative to the stator housing in the direction along the longitudinal axis of the stator housing for compression purposes.

A pump assembly comprises an inlet, an outlet and a housing having an inlet aperture in fluid connection with the inlet, and an outlet aperture in fluid connection with the outlet. A rotor located within the housing is shaped to form with an interior surface of the housing a chamber. On rotation of the rotor, the chamber conveys fluid from the inlet aperture to the outlet aperture. The housing carries a seal located in the inlet and urged into contact with the rotor to prevent the passage of fluid past the rotor from the outlet to the inlet. Center lines of the inlet and the outlet are parallel to one another. The outlet can be formed by linear movement of a mold core.

The invention relates to a screw spindle pump, with a housing (2) which surrounds a delivery chamber (5), two spindles (7, 8), namely a drive spindle (7) and an opposed running spindle (8), a housing insert (6) which is arranged in the housing (2) and in which the spindles (7, 8) are accommodated, at least one bearing element (13, 13), which is connected to the housing insert (6) and on which bearings (12) of the spindles (7, 8) are arranged, and with at least one housing cover (14, 14), closing a housing opening. It is the object of the invention to provide a screw spindle pump at which maintenance and inspection work can be carried out more simply and cost-effectively. The invention achieves this object in that the bearing element (13, 13) together with the housing insert (6) and the spindles (7, 8) accommodated therein forms a unit (15) which, after the housing cover (14, 14) is taken off, is removable from the housing (2) through the housing opening.

A pump includes a housings and a rotor capable of rotating within the housing. The rotor engages an interior surface of the housing in use, with at least two radially-inward shaped surfaces on the rotor forming respective chambers with the interior surface. In use, the chambers transport fluid from an inlet in the housing to an outlet in the housing as the rotor rotates. A seal provided between the inlet and the outlet will engage each of the shaped surfaces to prevent fluid passing from the outlet to the inlet as each shaped surface travels from the outlet to the inlet. The rotor includes a surface portion extending axially and circumferentially between respective edges of the shaped surfaces. On planes normal to an axis of rotation of the rotor, the surface portion of the rotor has a greater curvature than that of the interior surface of the housing.

A sliding vane pump is provided including a pump assembly having a housing with a fluid inlet and a fluid outlet formed therein, a lining member received in the housing defining a substantially cylindrical inner surface and a rotor arranged inside the lining member, defining a substantially cylindrical outer surface. The inner surface of the lining member and outer surface of the rotor define a working space therebetween. The pump assembly also comprises a plurality of vanes received in slots formed about the rotor outer surface. Each vane is arranged to slide in the radical direction with respect to the rotor such that an outer edge of the vane contacts the lining member inner surface, thereby dividing the working space into working chambers. Rotation of the rotor draws fluid from the fluid inlet working into the working chambers, which is ejected into the fluid outlet.

A uniaxial eccentric screw pump includes: a stator having a through hole 8a whose inner surface is formed in a female screw shape; a rotor that is a male screw shaft body inserted into the through hole of the stator; a plurality of shims that are arranged on a radially outside of the stator in a range from one end to the other end of the stator, are in surface contact with an outer surface of the stator, are capable of compressing the stator by moving radially inward with respect to the stator, and have, on an outer surface, an inclined surface gradually inclined radially inward or outward toward one end; and an adjustment member that is movable in an axial direction with respect to the stator and has a pressing part that can press the inclined surface of each of the shims.

A scroll compressor includes a plurality of fixing protrusions that are provided spaced apart from each other in a key that constitutes an Oldham ring, and an orbiting scroll, to which the key is coupled, or a ring body of the Oldham ring may be provided with a plurality of fixing grooves which are spaced part from each other and into which the plurality of fixing protrusions are respectively inserted and fixed.

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.

The non-lubricated compressor (10) for compressing a gas, comprises: a stationary stator (12) with a housing (18) comprising a rotor cavity (20) delimited by a bottom wall (22), a top wall (24), and a lateral wall (26) connecting said bottom wall (22) and said top wall (24), a rotor element (14) arranged for rotation about an axis (z) within the rotor cavity (20) for compressing a gas therein, a self-supporting sealing element (16) arranged within the rotor cavity (20), wherein the sealing element (16) is made of an abradable carbon material, and comprises a wall portion (34) arranged on an inner surface of the lateral wall (26) of the rotor cavity (20).

A pump for conveying a fluid includes a casing with a casing inner wall, a pump interior, an inlet opening, an outlet opening, a displacement assembly, and a radial protective element arranged in the pump interior in order to line at least one radial section of the pump interior, the radial protective element bearing against a radial section of the casing inner wall. A fastening element is provided which can be arranged in a fastening position in which the fastening element bears against an edge of the radial protective element and in the process fastens the radial protective element in the pump interior, wherein the fastening element has a longitudinal extent which extends from a first axial end of the pump interior along a recess arranged in the casing inner wall.