A turbo fluid machine includes a rotating member having a bearing-contact surface; an operating part configured to rotate together with the rotating member to compress and discharge a fluid; a housing accommodating the rotating member and the operating part; and a foil bearing having a bearing surface that faces the bearing-contact surface and supporting the rotating member such that the rotating member is rotatable relative to the housing. At least one of the bearing-contact surface or the bearing surface has thereon a coating layer. The coating layer comprises polyamide-imide serving as a binder resin and molybdenum disulfide serving as a solid lubricant. A mass ratio of molybdenum disulfide to polyamide-imide is 0.42 or more.

A radial foil bearing includes: a bearing housing provided with an insertion hole; a top foil accommodated in the insertion hole; and a cover attached to an end surface of the bearing housing in an axial direction in which the insertion hole extends, wherein the top foil is rolled in a cylindrical shape in a state where two ends of the top foil intersect such that the two ends of the top foil are pulled out toward the bearing housing, and the cover faces, in the axial direction, at least either one of the two ends of the top foil, and an engagement member attached to the bearing housing and engaging with the top foil.

This aerodynamic foil bearing has a sleeve (4) inside which are arranged: a foil referred to as the top foil (16), and a bump foil (14) arranged between the top foil (16) and the sleeve (4), a foil (12) of viscoelastic material arranged between an inner face of the sleeve (4) and the bump foil (14).

A journal air bearing is provided. The bearing includes a top foil configured to receive the shaft, an intermediate foil disposed radially outboard the top foil, and a journal sleeve disposed radially outboard the intermediate foil. The intermediate foil defines a plurality of holes configured to act as a vent to communicate fluid to an increased supply area to an air film.

A compressor assembly, a vapor compression system incorporating the same, and a method for operating the vapor compression system are provided. The compressor assembly includes a motor for driving a rotating shaft, a foil bearing for supporting the rotating shaft, a compression mechanism for increasing the pressure of a working fluid, a supply line in fluid communication with the compression mechanism, and a heating apparatus for heating the working fluid. The supply line is configured for injecting the working fluid (e.g., from downstream of the compression mechanism) toward the foil bearing. The method provides for the monitoring of the temperature of the working fluid. When the temperature of the working fluid is less than 3° F. of superheat it is heated prior to being injected toward the foil bearing. The heating of the working fluid prevents, or at least mitigates, liquid from being transferred to the foil bearing.

An air foil journal bearing can entirely restrain movement of a buffer member, which is provided inside a bearing housing in a direction of a shaft of the bearing. The air foil journal bearing includes: the bearing housing having a hollow part into which the shaft is inserted, wherein a first stopping groove is formed at an inner circumferential surface of the hollow part and a second stopping groove is formed at the inner circumferential surface of the hollow part along at least a part of an entire circumference of the hollow part; a top foil provided in the hollow part and configured to have a shape covering the shaft; and the buffer member provided between the hollow part and the top foil and elastically supporting the top foil.

A compliant foil radial bearing (100) comprising: a bushing (110) comprising a bore defined therethrough; a spring foil (120, 130) arranged to conform to a radially inner surface of the bore; a fluid foil (140, 150) arranged to conform to a radially inner surface of the spring foil for rotatably receiving a rotor, wherein: the spring foil comprises one or more retaining portions (160) arranged to extend axially and radially outside the radially inner surface of the bore.

Provided is an air foil journal bearing including a bearing housing; a bump foil disposed inside the bearing housing, having an uneven-shaped elastic bump, having one end coupled and fixed to the bearing housing in the circumferential direction, and having the other end formed as a free end; an outer top foil disposed inside the bump foil; an inner top foil disposed inside the outer top foil; and a middle top foil interposed between the outer top foil and the inner top foil, and coupled and fixed to the bearing housing, thereby preventing deviation of the free end of the bump foil in the width direction due to vibration occurring when a rotor is rotated at a high speed.

A fluid machine includes a rotary shaft, an operation body configured to discharge fluid by rotation of the rotary shaft, a housing accommodating the rotary shaft and the operation body, and a foil bearing disposed in the housing rotatably supporting the rotary shaft. The foil bearing includes a cylindrical bearing housing, a top foil between the bearing housing and the rotary shaft, and a bump foil between the bearing housing and the top foil and elastically supporting the top foil. The bearing housing has a protrusion protruding inwardly in a radial direction from the bearing housing. The protrusion includes an abutment surface configured to restrict deformation of the bump foil to an elastic range not to reach a plastic range by abutting against the top foil or the bump foil when the top foil is displaced outwardly in the radial direction of the bearing housing.

A compliant foil radial bearing (100) comprising: a bushing (110) comprising a bore defined therethrough; a spring foil (120, 130) arranged to conform to a radially inner surface of the bushing; a fluid foil (140, 150) arranged to conform to a radially inner surface of the spring foil for rotatably receiving a rotor, wherein: the radially inner surface of the bore comprises a plurality of axially oriented pads arranged around the circumference thereof.