An arc turbine system includes an elliptical housing, a rotor having two sliding channels positioned centrically to the housing, and two sliding arcs disposed within the rotor sliding channels and slide therein. The sliding arcs are engaging the housing simultaneously at both ends in a near friction-free environment supported by repulsion force of like-pole magnets. Four chambers disposed within two static chambers between the rotor and the long-axis of said housing, the two static chambers further include proper inlet and outlet ports configured to allow fluid and gas flow into and flow out of the static chambers. The system configured in two distinct settings for two distinct uses. 1) To generate dense rotating energy with optimum efficiency, and high power-to-weight ratio by burning fuel and 2) to pump, compress, vacuum, convey, pressurize, turbocharge, allow precision and micro-movement of gas and liquid, conversion of pressurized gas and liquid to rotating energy, all with optimum efficiency, near-zero vibration, near-zero friction, capability of handling all viscous fluids and 100% increased flow rate using dual inlet and dual outlet ports.

The invention relates to an external gear machine (1) in particular an external gear pump or an external gear motor, having at least two gears (3, 4) that mesh with each other in external engagement, wherein the gears (3, 4) are surrounded by a housing (10), wherein one gear (4) has at least one bearing journal (7, 8) and the other gear (3) has a driving or driven journal (5), which are in each case mounted in a bearing bushing (38) so as to respectively be rotatable about a rotation axis (13, 14), wherein a bearing sleeve pp with an anti-twist element is arranged in the bearing bushing (38). In order to improve the external gear machine, in particular with regard to the materials that can be used for producing the bearing bushings and/or the service life, the anti-twist element of the bearing sleeve is arranged in a through-hole of the bearing bushing and is combined with a filter device and/or throttle device via which a working medium of the external gear machine (1) reaches the bearing sleeve.

Disclosed is a liquid pumping device, including a first component, a second component and a third component, wherein the second component moves relative to the first component in a fixed manner; a medium inlet and a medium outlet not in communication with each other are provided in a contact surface of the first component in liquid tightness sliding fit with the second component; a groove is provided in a contact surface of the second component in liquid tightness sliding fit, and the groove moves along a fixed path in the range of the contact surface in liquid tightness sliding fit; and the movement path of the groove respectively passes the medium inlet, the medium outlet and the third component, the third component is arranged on the side of the medium outlet in the forward movement direction of the groove, and when the groove moves forward through the third component, the part of the third component entering the groove extrudes the medium in the groove to the medium outlet. The quantification of liquid by the device of the present invention is determined by the groove, and the principle facilitates the control of the output precision of the pump.

An apparatus for a submersible screw pump includes a cylindrical rotor located inside of a cylindrical stator. The rotor has a screw thread formed in an opposite direction in relation to screw threads of the stator. The external surface of the rotor has a curvilinear shape and the internal surface of the stator has semicircular shapes without rectangular edges. These surface features of the rotor and stator obtain high speed performance for the apparatus with reduced vortices. A gap between the internal surface of the stator and the external surface of the rotor is 0.1-0.2 millimeters. A unloading thrust bearing is attached to a rotor shaft positioned between an intake thrust bearing and the intake end of the rotor. A cavity in the unloading thrust bearing is configured to receive production fluid from the discharge end of the rotor.

A compressor is provided and may include a shell, a hub, an insert, and at least one collar. The hub may be disposed within the shell and define an axis of rotation. The hub may include an axially extending aperture. The insert may be disposed within the aperture. The at least one collar may be disposed about the hub.

A progressing cavity device operates as a motor to impart torque to a bit. A stator of the device defines an internal profile having uphole stages with a first dimension being less than a second dimension of downhole stage. A rotor has an external profile with a constant outer dimension along its length. Disposed in the stator, the rotor defines cavities with the stator and is rotatable with pumped fluid progressing in the cavities from the uphole to downhole to transfer torque to the drive toward the downhole end. Although the rotor is subjected at the downhole end to a reactive torque from the bit, the interference fit of the rotor's constant dimension with the stator's downhole stages is less than with the uphole stages, which can mitigate issues with heat buildup in the downhole stages. The device can also operates as a progressing cavity pump.

A mud motor stator or a pump comprising of a tubular outer portion; a number of lobes extending radially inwardly from the tubular outer portion, at least one of which comprises a skeletal structure and method for producing a mud motor stator or a pump comprising of placing material and bonding the material together in a pattern dictated by the design shape of the stator or pump.

A mud motor stator or a pump comprising of a tubular outer portion; a number of lobes extending radially inwardly from the tubular outer portion, at least one of which comprises a skeletal structure and method for producing a mud motor stator or a pump comprising of placing material and bonding the material together in a pattern dictated by the design shape of the stator or pump.

A scroll compressor includes a first scroll and a second scroll engaged with the first scroll to form a compression chamber with the first scroll while performing an orbiting movement with respect to the first scroll. A frame is fixed to a side of the first scroll with the second scroll interposed between the frame and the first scroll and the frame supporting the second scroll in an axial direction. An Oldham ring includes a ring portion and a key portion protruding from the ring portion. The key portion is slidably coupled to a key recess in the frame or the second scroll to enable the second scroll to perform the orbiting movement, and the key portion of the Oldham ring is formed of the same material as the second scroll. A wear preventing member is provided between the key portion and the key recess.

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.