The disclosure provides rotary machines that include, in one embodiment, a shaft defining a central axis A, the shaft having a first end and a second end. The shaft can have a first gearbox disposed thereon defining one or more cavities therein. At least one contour is slidably received into an arcuate cavity in an exterior surface of the gearbox. The contour has a convex outer surface that cooperates with an inwardly facing curved surface of a housing to form a working volume. A gearbox mechanism consisting of gears, crankshafts, bearings and connecting rod creates an oscillatory motion 2 times per revolution such that the contour can navigate about the arcuate cavity without contacting the cavity at a high rate of rotating speed. Thus, said working volume can expand and compresses twice per rotatable shaft revolution.

A refrigerant compressor reserves lubricating oil in a sealed container, and accommodates therein an electric component, and a compression component which is driven by the electric component and compresses a refrigerant. At least one of slide members included in the compression component is made of an iron-based material, and an oxide coating film comprising a composition A portion, a composition B portion, and a composition C portion is provided on a slide surface of the iron-based material. The composition A portion is a portion containing diiron trioxide (Fe.sub.2O.sub.3) which is more in quantity than other substances, and is, for example, an outermost portion (160a). The composition B portion is a portion containing triiron tetraoxide (Fe.sub.3O.sub.4) which is more in quantity than other substances and containing a silicon (Si) compound, and is, for example, an intermediate portion (160b). The composition C portion is a portion containing triiron tetraoxide (Fe.sub.3O.sub.4) which is more in quantity than other substances and containing silicon (Si) which is more in quantity than silicon (Si) of the composition B portion, and is, for example, an inner portion (160c).

A compressor may include a shell, a compression mechanism, a driveshaft, a motor assembly, and a stator support member. The compression mechanism is disposed within the shell. The driveshaft drivingly is engaged with the compression mechanism. The motor assembly may be disposed within the shell and is drivingly engaged with the driveshaft. The motor assembly includes a rotor and a stator. The stator is fixed relative to the shell. The rotor may include an axially extending portion and a radially extending portion. The axially extending portion may be disposed radially outward relative to the stator. The radially extending portion may engage the driveshaft and may be disposed axially between the stator and the compression mechanism. The stator support member may be fixed relative to the shell and the stator. The stator support member may extend longitudinally through at least a portion of the stator.

A roticulating thermodynamic apparatus (100) having a first fluid flow section (111) and a second fluid flow section (115). The first fluid flow section (111) is configured for the passage of fluid between a first port (114a) and second port (114b) via a first chamber (134a). The second fluid flow section (115) is configured for the passage of fluid between a third port (116a) and a fourth port (116b) via a second chamber (134, 234b). The second port (114b) is in fluid communication with the third port (116a) via a first heat exchanger (302a).

A roticulating thermodynamic apparatus (100) having a first fluid flow section (111) and a second fluid flow section (115). The first fluid flow section (111) is configured for the passage of fluid between a first port (114a) and second port (114b) via a first chamber (134a). The second fluid flow section (115) is configured for the passage of fluid between a third port (116a) and a fourth port (116b) via a second chamber (134, 234b). The second port (114b) is in fluid communication with the third port (116a) via a first heat exchanger (302a).

An apparatus comprising: a shaft (18) rotatable about a first rotational axis (30); an axle (20) defining a second rotational axis (32); a first piston member (22) extending from the axle (20) towards a distal end of the shaft (18); a rotor (16) carried on the axle (20); the rotor (16) comprising a first chamber (34a); a housing (12) having a wall defining a cavity (26); a first magnetic guide feature (52); a second magnetic guide feature (50); whereby: the rotor (16) and axle (20) are rotatable with the shaft (18) around the first rotational axis (30); the rotor (16) is pivotable about the axle (20) to permit relative pivoting motion between the rotor (16) and the first piston member (22) as the rotor rotates about the first rotational axis (30); and at least one of the first magnetic guide feature (52) and second magnetic guide feature (50) comprises an electromagnet to pivot the rotor (16) about the axle (20) relative to the first piston member (22).

An apparatus comprising: a shaft (18) rotatable about a first rotational axis (30); an axle (20) defining a second rotational axis (32); a first piston member (22) extending from the axle (20) towards a distal end of the shaft (18); a rotor (16) carried on the axle (20); the rotor (16) comprising a first chamber (34a); a housing (12) having a wall defining a cavity (26); a first magnetic guide feature (52); a second magnetic guide feature (50); whereby: the rotor (16) and axle (20) are rotatable with the shaft (18) around the first rotational axis (30); the rotor (16) is pivotable about the axle (20) to permit relative pivoting motion between the rotor (16) and the first piston member (22) as the rotor rotates about the first rotational axis (30); and at least one of the first magnetic guide feature (52) and second magnetic guide feature (50) comprises an electromagnet to pivot the rotor (16) about the axle (20) relative to the first piston member (22).

Volumetric compressor (1) for collection and/or treatment equipment of material in liquid, solid, dusty or muddy form. The compressor (1) comprises an operative chamber (50), defining a suction section and an exhaust section of a first fluid, a first header (61) and a second header (62), which delimit said chamber (50) on opposite parts along a longitudinal axis (101). The compressor further comprises at least two rotors (80, 80) with lobes (81, 81) housed in the chamber (50), each rotor (80, 80) rotating about a rotation axis (108, 108) substantially parallel to said longitudinal axis (101). The lobes of each rotor develop according to a helical profile. Furthermore, each of the headers (61,62) defines at least one injection opening (71, 71,72,72) communicating with a feeding device (150) of a second fluid.

A refrigerant compressor comprises an electric component; and a compression component which is driven by the electric component and compresses a refrigerant. At least one of slide members included in the compression component is made of an iron-based material. An oxide coating film (150) is provided on a slide surface of the iron-based material, the oxide coating film including a first portion (151), a second portion (152), and/or a third portion (153). The first portion (151) contains at least fine crystals (155). The second portion (152) contains columnar grains (156). The third portion (153) contains layered grains (157).

A compressor and waste heat recovery system is disclosed in which mechanical work from a prime mover along with work generated from the waste heat recovery system are used to operate the compressor. A gas producing system is heated by waste heat from operation of the compressor to produce a stream of gas used to drive a turbine. The turbine is in work communication with the compressor. In one embodiment the gas producing system is a metal hydride. An overrunning clutch can be used with the turbine. In one form multiple gas producing systems are used, one of which to emit gas while the other is used to receive and capture the emitted gas.