Disclosed is an air compressing apparatus with a bearing wear-causing thrust reducing/compensating unit, and more specifically, to an air compressing apparatus with a bearing wear-causing thrust reducing/compensating unit that reduces or compensates thrust generated due to high-speed rotation of an air-compression impeller formed in the air compressing apparatus, thereby maximizing a service life and durability of the air compressing apparatus.

A method of controlling, by a controller for a compressor (200), pressure at plurality of magnetic motor thrust bearings (360, 370) for a motor (280) disposed within a housing (220) for the compressor (200), wherein the motor (280) and an impeller (270) are disposed on a compressor shaft (260) within the housing, the method including: monitoring current at each of the plurality of magnetic motor thrust bearings (360, 370), controlling a flow regulator (400) in a bypass loop (380) for the impeller (270) to decrease flow through the bypass loop when a first current in a first of the plurality of magnetic motor thrust bearings (360, 370) exceeds a second current in a second of the plurality of magnetic motor thrust bearings (360, 370), and controlling the flow regulator (400) to increase flow through the bypass loop (380) when the second current exceeds the first current.

A rotary machine is provided with a plurality of impellers (3) which have a disk (31) rotating with a rotary shaft (2), the impellers being arranged side by side; and a casing (4) in which a casing flow passage (43) is formed to distribute a working medium therein. An impeller (3) disposed farthest away from a second side in the axial direction is disposed in a space communicating with an upstream part of the casing flow passage (43), and a protrusion portion (5) protruding from a back side (311) of the disk (31). The protrusion portion (5) has a sealing surface (51) which is formed to be parallel to an outer surface (21) of the rotary shaft (2) to seal a gap between itself and the casing (4), and a pressure receiving surface (51) which extends from the outer surface (21) to the sealing surface (51).

The balancing and sealing piston for an integrated motor compressor comprising a balancing piston designed to be mounted on a shaft of the motor compressor to compensate for the differential pressure being applied to the wheels of a compression section of the motor compressor between the suction pressure and the discharge pressure, and a sealing device surrounding the balancing piston and designed to be mounted on the case of the motor compressor to render the compression section tight. It furthermore comprises a gas extraction port, the axial position of the extraction port being determined such that the pressure value of the extracted gas is equal to a predetermined value less than the value of the discharge pressure.

A rotating machine includes: a rotary shaft that is configured to rotate about a center axis; an impeller that is fixed to the rotary shaft and that is configured to compress a working fluid by integrally rotating with the rotary shaft; a casing that covers the rotary shaft; a first seal portion that is disposed at a position away from the impeller in a center axis direction of the rotary shaft and that is configured to seal a portion between the rotary shaft and the casing with a seal gas; a second seal portion that is disposed between the impeller and the first seal portion and that is configured to seal a portion between the rotary shaft and the casing; and a gas supply path through which the seal gas is introduced into the first seal portion.

The balancing system has a balancing body to be mounted on a rotor of a turbomachine and a sealing ring to be mounted on a stator of the turbomachine; the sealing ring is arranged around the balancing body so that the balancing body can rotate about a rotation axis, thus there is a clearance between the body and the ring; furthermore, there is an arrangement for changing an axial position of the sealing ring during operation of the turbomachine so that the clearance can be adjusted. The possibility of adjusting clearance during operation of the turbomachine, such balancing system provides a good balancing action with a small leakage and a small risk of mechanical interference at any time during operation of the turbomachine.

A rotary machine according to at least one embodiment is configured such that, in a region on an opposite side to a thrust collar across a key in an axial direction, a defective portion is provided on one of an outer circumferential surface of a shaft, or a surface of the shaft along a radial direction or a surface of a holding member along the radial direction, or at least a part of a section having the surface along the radial direction is formed by a material having a Young's modulus lower than a Young's modulus in another section.

A centrifugal compressor comprises an impeller including a hub and a plurality of blades. The hub is provided with a through hole. The hub has an external radial surface having an inner external radial surface and an outer external radial surface. The outer external radial surface is formed closer to a back surface than an imaginary curved surface having as a radius a radius of curvature of the inner external radial surface at a radially outer edge thereof.

A centrifugal compressor comprises a rotation shaft, an impeller, and a casing. The impeller has a hub and a plurality of blades. The casing has an opposite surface facing a back surface of the hub, and a projection projecting from the opposite surface toward the impeller. The hub is provided with an accommodation space that accommodates the projection. The accommodation space includes a through hole penetrating the hub from the back surface toward an external radial surface. The through hole opens while avoiding the blades.

A pumping arrangement includes first and second multistage pumps. Each pump includes a housing with a pump unit, the housing includes a pump inlet and a pump outlet, the pump unit includes a plurality of impellers to convey fluid from the pump inlet to the pump outlet, and a pump shaft extending from a drive end to a non-drive end, each impeller mounted to the pump shaft. The second multistage pump includes a first mechanical seal having a process side facing the pump unit. The pump outlet of the first multistage pump connected to the pump inlet of the second multistage pump, so that the first multistage pump and the second multistage pump are arranged in series. The process side of the first mechanical seal of the second multiphase pump is in fluid communication with the pump inlet of the first multistage pump.