Abstract: A compressor cover covering a delivery fan radially outwardly discharging a fluid from an axial direction by rotating around the axis, the compressor cover comprising: a cover body including a tubular part in which a tubular inner peripheral surface along the axis and a shroud surface disposed on an axially downstream side of the tubular inner peripheral surface and expands in diameter toward the downstream side are formed; and a sleeve including an outer tube having an outer peripheral surface fitted to the tubular inner peripheral surface, an inner tube disposed on a radially inner side of the outer tube and defines a recirculation flow path in which a portion of the fluid circulates between the inner tube and the outer tube, and a plurality of struts disposed at intervals in the peripheral direction.

Abstract: An impeller wheel according to an embodiment includes a hub, a plurality of long blades disposed on a circumferential surface of the hub, the plurality of long blades extending from an inlet portion to an outlet portion of fluid and a plurality of short blades each disposed on the circumferential surface of the hub, the plurality of short blades extending from a downstream side of leading edges of the plurality of the long blades to the outlet portion in a flow passage formed between adjacent long blades of the plurality of long blades. In the impeller wheel, an expression ?2s,full<?2s,spl is satisfied, where ?2s,full and ?2s,spl are respectively blade angles on tip side edges of the plurality of long blades and the plurality of short blades at the outlet portion.

Abstract: A centrifugal compressor includes an impeller, a diffuser flow passage forming portion forming an annular diffuser flow passage on a downstream side of the impeller, a plurality of small chord-pitch ratio diffuser blades disposed in the diffuser flow passage at intervals in a circumferential direction of the impeller, and a flow passage dividing annulus extending to the diffuser flow passage along a radial direction of the impeller, and dividing the diffuser flow passage into a hub-side flow passage and a shroud-side flow passage.

Abstract: This compressor wheel (3) is provided with a disc (22) which is formed in a disc shape and provided to be rotatable around a central axis (C); and a plurality of blades (23) provided on a disc surface (22f) facing a first side in the central axis (C) direction with an interval in a circumferential direction around the central axis (C). A rear surface (22r) of the disc (22) facing a second side in the central axis (C) direction has a convex curved surface (25) which is convex toward the second side in the central axis (C) direction at least part of a center portion of the disc (22).

Abstract: A rotating machine includes a rotating body configured to rotate around a central axis, and a casing configured to accommodate at least a part of the rotating body, and the casing, includes a main section made of a metallic material, and a high-porosity section made of the same material as the main section and having a porosity higher than the main section.

Abstract: The present invention provides a method for producing a casing for a compressor, the method including an intake-side casing molding process of molding an intake portion and a first main body portion of a scroll portion by integral molding of resin; an impeller-side casing molding process of integrally molding a second main body portion of the scroll portion and a diffuser portion by a resin molding metal mold used in the intake-side casing molding process; a die sliding process of combining the intake portion and the first main body portion which have been integrally molded, and the second main body portion and the diffuser portion which have been integrally molded, by slide of the resin molding metal mold; and a secondary molding process of joining the intake portion and the first main body portion, and the second main body portion and the diffuser portion combined with each other by resin.

Abstract: An object is to provide a fluid machine whereby it is possible to improve performance, for example, expand a flow-rate operation rage with a simplified shape of an intake pipe. A fluid machine includes an impeller mounted to a rotation shaft, a housing which houses the impeller rotatably, and an intake pipe for supplying a fluid to the housing. The intake pipe includes at least a first bend portion disposed on a first plane, and a second bend portion disposed at a downstream side of the first bend portion and on a second plane which is different from the first plane. The second bend portion includes an upstream section having a center axis oriented along a center axis of a downstream section of the first bend portion and a downstream section having a center axis oriented along an axial direction of the impeller at a front of the impeller. The intake pipe has a constant cross-sectional shape from an upstream end of the first bend portion to a downstream end of the second bend portion.

Abstract: A housing is formed with an impeller side communicating passage extending from an impeller chamber in a direction including a component of an outer side in a radial direction, circulating channels extending from the impeller side communicating passage in a direction including a component of a front side in the axial direction, and a suction side communicating passage communicating with the circulating channel and a suction channel that guides a gas into the impeller chamber. A radial dimension from an axis to a communicating position at which each of the circulating channels communicates with the suction side communicating path is larger than a radial dimension from the axis to a communication position with the impeller side communicating path in the circulating channel. A channel area of the circulating passage at a communicating position for the suction side communicating passage is larger than a channel area of the circulating channel at a communicating position for the impeller side communicating passage.

Abstract: Provided is a compressor cover that covers a delivery fan which outwardly discharges in the radial direction a fluid sucked in from an axial direction by rotating around the axis, the compressor cover comprising: a cover body that includes a tubular part in which a tubular inner peripheral surface along the axis and a shroud surface that is disposed on an axially downstream side of the tubular inner peripheral surface and expands in diameter toward the downstream side are formed; and a sleeve that includes an outer tube having an outer peripheral surface that is fixed to the tubular inner peripheral surface, an inner tube that is disposed on a radially inner side of the outer tube and defines a recirculation flow path in which a portion of the fluid that is sucked in by the delivery fan circulates between the inner tube and the outer tube, and a plurality of struts that are disposed at intervals in the peripheral direction so as to connect the outer tube and the inner tube, thereby partitioning the recirculat

Abstract: A cooling structure for a bearing housing for a turbocharger is provided. The cooling structure is configured so that the cooling structure has improved productivity, the occurrence of heat soak-back is reduced, and the cooling structure has improved cooling performance. The cooling structure cools both a bearing housing 13 and a bearing 52 by cooling water flowing through an annular cooling water path 13f formed in the bearing housing 13, and is provided with: a water path inlet 13h for supplying the cooling water and a water path outlet 13j for discharging the cooling water, which are provided in the bearing housing 13 to communicate with the annular cooling water path 13f; and a partial partition 14a in the bearing housing 13 to partially close a water path which forms the shortest route between the water path inlet 13h and the water path outlet 13j.

Abstract: Provided is a centrifugal compressor impeller which is characterized in that leading edges 7a on a shroud side of splitter blades 7 are offset from a circumferentially equidistant position between full blades 5R and 5F toward a suction side Sb of the full blade 5F, and trailing edges 7b on a hub side of the splitter blades 7 are offset from a circumferentially equidistant position between the full blades toward the suction side Sb of the full blade 5F, so that a tip leakage vortex W flowing from a tip clearance between the tips of the full blades 5F and the shroud toward the leading edges 7a of the splitter blades 7 flows over the leading edges 7a of the splitter blades 7.

Abstract: An object is to provide a fluid machine whereby it is possible to improve performance, for example, expand a flow-rate operation rage with a simplified shape of an intake pipe. A fluid machine includes an impeller mounted to a rotation shaft, a housing which houses the impeller rotatably, and an intake pipe for supplying a fluid to the housing. The intake pipe includes at least a first bend portion disposed on a first plane, and a second bend portion disposed at a downstream side of the first bend portion and on a second plane which is different from the first plane. The second bend portion includes an upstream section having a center axis oriented along a center axis of a downstream section of the first bend portion and a downstream section having a center axis oriented along an axial direction of the impeller at a front of the impeller. The intake pipe has a constant cross-sectional shape from an upstream end of the first bend portion to a downstream end of the second bend portion.

Abstract: It is intended to provide a cooling structure for a bearing housing for a turbocharger, the cooling structure being configured so that the cooling structure is manufactured with improved productivity, the occurrence of heat soak-back is reduced, and the cooling structure has improved cooling performance. The cooling structure is configured to cool both a bearing housing 13 and a bearing 52 by cooling water flowing through an annular cooling water path 13f formed in the bearing housing 13, and is provided with: a water path inlet 13h for supplying the cooling water and a water path outlet 13j for discharging the cooling water, which are provided in the bearing housing 13 so as to communicate with the annular cooling water path 13f and a partial partition 14a in the bearing housing 13 to partially close a water path which forms the shortest route between the water path inlet 13h and the water path outlet 13j.

Abstract: Provided is a centrifugal compressor impeller which is characterized in that leading edges 7a on a shroud side of splitter blades 7 are offset from a circumferentially equidistant position between full blades 5R and 5F toward a suction side Sb of the full blade 5F, and trailing edges 7b on a hub side of the splitter blades 7 are offset from a circumferentially equidistant position between the full blades toward the suction side Sb of the full blade 5F, so that a tip leakage vortex W flowing from a tip clearance between the tips of the full blades 5F and the shroud toward the leading edges 7a of the splitter blades 7 flows over the leading edges 7a of the splitter blades 7.