The present invention relates to a compression device driven by an electric machine, for which a rotor (4) comprises a cylindrical magnet (5) and a binding ring (6), preferably non-magnetic. According to the invention, cylindrical magnet (5) is solid and cylindrical magnet (5) is fastened to a support piece (7) by means of binding ring (6), support piece (7) being fastened to one end of compression shaft (3).

A single-shaft turbo compressor having a rotor extending along an axis, an outer housing, static flow fittings, bearings for supporting the rotor, and at least one first shaft seal, wherein the rotor has a shaft and an impeller arranged on the shaft, wherein the static flow fittings have supply elements, intermediate elements and discharge elements, and wherein the outer housing has a casing part that is open at the end on both sides. A first cover of the outer housing is connected to a first shaft seal, wherein supply lines and discharge lines of the first shaft seal are provided extending through the first cover into a wall thickness of the casing part adjacent to the first cover.

A bolt fastening structure has an upper flange and a lower flange of a casing to which inner pressure is applied, the upper flange and the lower flange defining an abutting interface therebetween; a bolt hole formed through the abutting interface; and a counterbored portion formed asymmetric about a bolt hole center. The abutting interface includes a first region extending from a bolt hole inner side edge to an upper and lower flanges inner edge and being a region where the upper flange and the lower flange are in surface-to-surface contact with each other; and a partial contact region extending from a bolt hole outer side edge to an upper and lower flanges outer edge and being a region where the upper flange and the lower flange are partially in surface-to-surface contact with each other. In the partial contact region, the upper flange and the lower flange are in surface-to-surface contact with each other in a second region, and the first region is larger than the second region.

A compressor operates within a system having a cooling capacity below 60 tons. The compressor includes a hermetically sealed housing and a drive module and aero module within the housing. The drive module includes a motor, a rotor, and oil free bearings. The aero module has a centrifugal impeller driven by the drive module to compress a working fluid. The compressor is arranged such that the working fluid flows through the drive module before reaching the aero module.

Some embodiments of the disclosure provide a bearing installation and fixation structure and a compressor. The bearing installation and fixation structure includes: a rotatable shaft (7); a bearing (6), provided on the rotatable shaft (7) in a sleeving manner; and an axial locating member, provided on the rotatable shaft (7) in a sleeving manner and including a fixing connecting section (1) and an axial locating section (2) that are integrated with each other; the fixing connecting section (1) is detachably fixed on the rotatable shaft (7); and the axial locating section (2) limits a position of the bearing (6) axially.

The present disclosure relates to a flow generator. A flow generator according to an embodiment of the present disclosure may include: a suction portion into which air is suctioned; a fan introducing the air introduced into the suction portion in an axial direction to discharge the air in a radial direction; a fan housing in which the fan is installed and which guides the air discharged from the fan; and a cover surrounding the fan and the fan housing. The fan housing may include: a housing plate supporting the fan; a guide wall protruding from one surface of the housing plate to surround at least a portion of an outer circumference of the fan; a first fan passage provided between at least a portion of the outer circumference of the fan and the guide wall; a second fan passage which is provided between the outer circumference of the fan and the cover and through which the air passing through the first fan passage flows; and a discharge portion located outside an outer surface of the guide wall to discharge the air passing through the second fan passage.

An impeller includes: a disk having a first disk member that has a tubular shape centered on an axis, and a second disk member that has a tubular shape centered on the axis and is arranged on a first side of the first disk member in a direction of the axis; a blade that is formed integrally with the second disk member; and a cover that forms a flow passage between the cover and the second disk member by covering the blade from an outer peripheral side. A recessed portion, which is recessed from the first side toward a second side in the direction of the axis, is formed in an annular-shape around the axis in the first disk member.

A water-cooled compressor housing assembly for a turbocharger includes a compressor housing that defines an open-ended cavity extending axially downstream into the compressor housing, and a separately formed cover that is affixed to the compressor housing so as to close the open end of the cavity and thereby define a coolant passage for a liquid coolant to be circulated through. A coolant inlet and a coolant outlet are provided for supplying coolant into and exhausting coolant from the coolant passage. The compressor housing has a simplified geometry that is manufacturable by sand casting without needed a sand core for the coolant passage, or by die casting.

A centrifugal fan and an air conditioning apparatus are provided. The centrifugal fan includes a top plate, a baseplate, a motor, a flow guiding cover, and a plurality of blades. A motor mounting hole is disposed at a central position of the baseplate, and the motor has a motor housing. The motor housing is mounted on the motor mounting hole and is fastened to the baseplate, and the motor at least partially extends between the baseplate and top plate. The blades are fastened between the top plate and the baseplate, and the plurality of blades are disposed around the motor. The flow guiding cover is sheathed on an outer peripheral side of the motor housing, and is detachably mounted on the baseplate.

A blower wheel is provided with a base member having an axis of rotation and with a rotor of a generator, wherein the rotor is fixedly secured on the blower wheel. At least one magnet is arranged on the rotor. An inertia ring is fixedly secured on the base member at a spacing to the at least one magnet. The inertia ring is made of a first material having a first density and the base member is made of a second material having a second density. The first density is greater than the second density. An internal combustion engine is provided with such a blower wheel.