A scroll compressor includes a compressor housing, an orbiting scroll member and non-orbiting scroll member intermeshed to form a compression chamber, a discharge pressure chamber, an intermediate pressure chamber. The housing includes a lower portion, a first intermediate cap, a second intermediate cap, and an upper portion. The discharge pressure chamber configured to receiving a discharge pressure fluid from the compression chamber. The intermediate pressure chamber fluidly connecting an intermediate pressure fluid inlet port and an intermediate pressure fluid injection port of the non-orbiting scroll member. A method injecting an intermediate pressure fluid into a compression chamber of a scroll compressor includes disposing the intermediate pressure fluid in an intermediate pressure chamber. The method also includes injecting the intermediate pressure fluid in the intermediate pressure chamber through the intermediate pressure fluid injection port into the compression chamber.

The invention relates to a dual-spindle helical spindle pump with a single-entry design, comprising a pump housing (11) which has a pump portion (12), a bearing portion (13) and a gear portion (14) with a gear chamber, wherein the bearing portion (13) and the pump portion (12) are designed separately from one another, comprising a feed housing part (50) as a component of the pump portion (12) in which two feed screws (17, 18) are provided, said feed screws having flanks (46) and being arranged on shafts (15, 16) in a feed space (51), wherein the shafts (15, 16) are mounted in the bearing portion (13) (external bearing system) and extend into the gear portion (14), and wherein the feed housing part (50) has at least one feed portion (52) with an inner wall (58) which faces the outer face (59) of the feed screws (17, 18). The invention provides that at least one separating element (60), which is in contact with at least one portion of the outer face (59) of the feed screws (17, 18), is between the inner wall (58) of the feed portion (52) and the outer face (59) of the feed screws (17, 18), at least in the region (57) of the feed screws (17, 18), and in that the separating element (60) is floatingly mounted in the feed housing part (50) relative to the inner wall (58) of the feed portion (52).

An electric screw coolant pump for integration into a temperature control circuit of an assembly of which the temperature is to be controlled. An accommodation housing includes a feeder line and a return line of the temperature control circuit, which open into a cavity. A part of the cavity surrounds a spindle housing and communicates with an outlet opening of the spindle housing as well as the feeder line. A sealing element, which provides a seal between a suction side and a pressure side, is arranged towards an end surface of the axial end of the inserted spindle housing.

Some embodiments are directed to a positive displacement pump having an eccentric piston, comprising a tube having a first end and a second end that is terminated by a cylinder secured to a delivery zone, the tube including an intake opening and a delivery opening, a drive shaft extending between the transmission zone and the tube, a piston arranged in the delivery zone and mounted in a sliding manner at the end of the shaft, being pressed against the cylinder by an elastic presser so as to prevent fluid displacement between the tube and the delivery zone when the pump is dry, and the elastic presser is provided to press the piston against the cylinder when the pump is running under load.

The subject matter of this specification can be embodied in, among other things, a rotary vane actuator. A rotor assembly includes longitudinal vanes disposed radially on a central shaft, with each vane connected at their ends to a circular plates secured to the shaft. Each vane has an outer edge, wherein the shaft, a surface of each plate, and the vanes define interior pockets in the rotor assembly. A stator assembly includes two stator elements each having a first longitudinal edge and a second longitudinal edge.

A sealing arrangement between a rotating plane surface on a rotor and a machine housing prevents flow of process fluid between an internal volume and an external volume of the machine housing. The sealing arrangement includes a piston arrangement, and a sealing bearing ring between the piston arrangement and the rotating plane surface. A fluid supply line supplies pressurized lubrication fluid through the machine housing to a piston cavity, wherein the piston arrangement further includes piston fluid channels and the bearing sealing ring includes lubrication conduits through the bearing sealing ring, corresponding with the piston fluid channels. The pressurized lubrication fluid is arranged for moving the piston arrangement against the sealing bearing ring and thus moving the sealing bearing ring against the sealing surface thus forming a sealing arrangement.

An internal gear pump (100) comprises: a rotor/torque ring comprising an internally lobed (140) rotor (130) and a torque ring (120) extending beyond at least a first end (134) of the rotor; an externally lobed (160) idler (150) encircled by the rotor; a hollow shaft (190) supporting the idler; a pressure relief element (200) positioned to shift between a first condition and a second condition; and a spring (210) biasing the pressure relief element toward the first condition from the second condition. The torque ring has at least one pressure relief port (240A, 240B) positioned so that: in the first condition, the pressure relief element blocks a path from an interior volume (235) of the pump to the pressure relief port; and in the second condition, relative to the first condition the pressure relief element does not block the path.

An eccentric screw pump for pumping fluids or flowing conveying media from a suction side to a pressure side, which includes a rotor and a stator, the stator being flexible and is connected to the pump housing on one side, in particular on the suction side. The rotor is connected to the drive shaft by means of an articulation. When the eccentric screw pump is in the idle state, there is no sealing contact at least in areas between the rotor and the stator in the sealing areas. When the eccentric screw pump is in the operating state, the stator is surrounded, at least in sections and/or, essentially, on the periphery by the conveying medium. The rotor and the stator are brought into contact with each other in the operating state along the sealing area.

The invention relates to a lobe pump with a. a housing (10), having an inlet (11) and an outlet (12) for the medium to be pumped, b. at least one lobe (20), which is mounted in the housing (10) so as to be drivable and rotatable and which has at least two conveying vanes (22) provided with a contour, which lobe conveys the medium to be delivered from the inlet (11) to the outlet (12), c. and one sealing element (30) per lobe (20), which is mounted on a sealing body (42) and runs over the contour of the lobe (20) during rotation of the lobe (20) and performs an outward travel movement from a minimum diameter of the lobe (20) to a maximum diameter of the lobe (20) and an inward travel movement from the maximum diameter of the lobe (20) to the minimum diameter of the lobe (20) on different sides of the conveying vanes (22), wherein d. the distance which the sealing element (30) covers on the inward travel side (221) of the conveying vane (22) during the inward travel movement is smaller than the distance on the outward travel side (222) during the outward travel movement.

The invention relates to a dual-spindle helical spindle pump with a single-entry design, comprising a pump housing (11) which has a pump portion (12), a bearing portion (13) and a gear portion (14) with a gear chamber, wherein the bearing portion (13) and the pump portion (12) are designed separately from one another, comprising a feed housing part (50) as a component of the pump portion (12) in which two feed screws (17, 18) are provided, said feed screws having flanks (46) and being arranged on shafts (15, 16) in a feed space (51), wherein the shafts (15, 16) are mounted in the bearing portion (13) (external bearing system) and extend into the gear portion (14), and wherein the feed housing part (50) has at least one feed portion (52) with an inner wall (58) which faces the outer face (59) of the feed screws (17, 18). The invention provides that at least one separating element (60), which is in contact with at least one portion of the outer face (59) of the feed screws (17, 18), is between the inner wall (58) of the feed portion (52) and the outer face (59) of the feed screws (17, 18), at least in the region (57) of the feed screws (17, 18), and in that the separating element (60) is floatingly mounted in the feed housing part (50) relative to the inner wall (58) of the feed portion (52).