A fan blade (1) has a front inflow edge (2) and a rear outflow edge (3). The fan blade (1) has an at least partially wavy inflow edge (4). The wavy inflow edge (4) forms a wave (W) with a specific three-dimensional waveform.

A fan blade (1) has a front inflow edge (2) and a rear outflow edge (3). The fan blade (1) has an at least partially wavy inflow edge (4). The wavy inflow edge (4) forms a wave (W) with a specific three-dimensional waveform.

A compressor is provided with: an impeller a housing configured to rotatably house the impeller and having an intake passage for introducing a gas to the impeller from outside the housing, a scroll passage for guiding the gas having passed through the impeller to the outside, and a bypass passage connecting the intake passage and the scroll passage so as to bypass the impeller; and a bypass valve having a valve body disposed in the bypass passage and capable of opening and closing the bypass passage. The valve body is configured to, in a fully closed state, separate the bypass passage into an inlet-side passage having a communication port communicating with the scroll passage and an outlet-side passage communicating with the intake passage. An inlet-side passage wall surface which defines the inlet-side passage includes at least an upstream passage wall surface portion connected to an upstream end of the communication port in a cross-sectional view of the housing taken along an axis of the impeller. The upstream passage wall surface portion is configured such that an angle between the upstream passage wall surface portion and an upstream scroll wall surface of a scroll passage wall surface which defines the scroll passage connected to the upstream end is less than 90 degrees.

A compressor is provided with: an impeller a housing configured to rotatably house the impeller and having an intake passage for introducing a gas to the impeller from outside the housing, a scroll passage for guiding the gas having passed through the impeller to the outside, and a bypass passage connecting the intake passage and the scroll passage so as to bypass the impeller; and a bypass valve having a valve body disposed in the bypass passage and capable of opening and closing the bypass passage. The valve body is configured to, in a fully closed state, separate the bypass passage into an inlet-side passage having a communication port communicating with the scroll passage and an outlet-side passage communicating with the intake passage. An inlet-side passage wall surface which defines the inlet-side passage includes at least an upstream passage wall surface portion connected to an upstream end of the communication port in a cross-sectional view of the housing taken along an axis of the impeller. The upstream passage wall surface portion is configured such that an angle between the upstream passage wall surface portion and an upstream scroll wall surface of a scroll passage wall surface which defines the scroll passage connected to the upstream end is less than 90 degrees.

An interface of a centrifugal fan includes an inlet shroud of an impeller and an air intake positioned adjacent the inlet shroud. The inlet shroud and the air intake cooperate to define a smooth flow path for an airflow entering the centrifugal fan.

An interface of a centrifugal fan includes an inlet shroud of an impeller and an air intake positioned adjacent the inlet shroud. The inlet shroud and the air intake cooperate to define a smooth flow path for an airflow entering the centrifugal fan.

A sealing system for a magnetic levitating centrifugal compressor, the magnetic levitating centrifugal compressor including a motor cavity and a motor shaft disposed within the motor cavity, an end of the motor shaft extends out from the motor cavity and is mounted with an impeller, the sealing system includes: a seal which is sleeved on the outer side of the motor shaft and is disposed between the impeller and the motor cavity; a first magnet which is fixed at the outer surface of the motor shaft; and a second magnet which is fixed at a side of the seal facing the motor shaft; the first magnet and the second magnet form a radial repulsive force in the radial direction of the motor shaft, so that the seal can be levitated in relative to the motor shaft and move therewith.

A sealing system for a magnetic levitating centrifugal compressor, the magnetic levitating centrifugal compressor including a motor cavity and a motor shaft disposed within the motor cavity, an end of the motor shaft extends out from the motor cavity and is mounted with an impeller, the sealing system includes: a seal which is sleeved on the outer side of the motor shaft and is disposed between the impeller and the motor cavity; a first magnet which is fixed at the outer surface of the motor shaft; and a second magnet which is fixed at a side of the seal facing the motor shaft; the first magnet and the second magnet form a radial repulsive force in the radial direction of the motor shaft, so that the seal can be levitated in relative to the motor shaft and move therewith.

A locking structure of a compressor impeller, which includes: a rotary shaft; a lock nut arranged on an end of the rotary shaft by means of a threaded connection and provided with waist-shaped holes extending along a circumferential direction thereof; an impeller sleeved on the end of the rotary shaft and located on an inner side of the lock nut, the impeller is provided with threaded holes in communication with the waist-shaped holes of the lock nut; a nose piece located on an outer side of the lock nut and provided with through holes in communication with the waist-shaped holes of the lock nut; and bolts passing through the through holes and the waist-shaped holes in turn into the threaded holes, thereby fixing the nose piece, the lock nut and the impeller together.

A compressor system includes a compressor housing and a driveshaft rotatably supported within the compressor housing. The compressor system further includes an impeller that imparts kinetic energy to incoming refrigerant gas upon rotation of the driveshaft, a thrust disk coupled to the driveshaft, and a bearing assembly mounted to the compressor housing. The impeller includes an impeller bore having an inner surface, and the thrust disk includes an outer disk and a hub. The bearing assembly rotatably supports the outer disk of the thrust disk. The hub is disposed within the impeller bore, and includes a hub outer surface in contact with the inner surface of the impeller bore. A first contact force between the hub outer surface and the inner surface of the impeller bore increases with increased rotational speed of the driveshaft.