A centrifugal pump assembly includes a pump head, a pump base defining a pump inlet and a pump outlet, a fluid outlet channel from the pump head to the pump outlet, impellers, defining an impeller fluid channel between an impeller inlet and outlet and connected with one of rotor shaft segments including a positive fit coupling for torque transfer between at least two rotor shaft segments, and one or more pump stage housing segments arranged between the pump base and the pump head. The pump stage housing segments have a structure defining a guide passage for receiving pumped fluid from the impeller outlet of the impellers and for guiding pumped fluid to the impeller inlet of another one of the impellers or to the pump head. The pump stage housing segments each have a structure defining at least a part of a wall section of the fluid outlet channel.

A centrifugal compressor is shown, comprising: an impeller; a rotatably mounted diffuser surrounding the impeller; and a driving arrangement configured to drive the impeller and diffuser to rotate in opposing directions.

A centrifugal pump sealing structure is provided. In one aspect, one sealing member is provided at a position where leakage paths from a fluid compression space between a middle housing and a cover and an electric component installation space between the middle housing and a lower housing are connected. Then, the two spaces are sealed. The number of sealing members is reduced, so that the internal structure becomes simpler and the assembly of the sealing member becomes easier.

Compressor rotor structure for turbomachinery, such as a compressor, is provided. Disclosed embodiments can benefit from sealing sleeves that may be arranged to inhibit passage onto respective hirth couplings of process fluid being processed by the compressor. The sealing sleeves may be affixed to adjoining structures (e.g., adjoining impeller bodies) by way of a slip fit connection to one of the adjoining structures and an interference fit connection with respect to the other adjoining structure, which is conducive to a user-friendly assembly of the sealing sleeves with the adjoining structures.

A centrifugal fan including an impeller housing and an impeller. The impeller housing has an accommodation space, an air inlet and an air outlet. The air inlet and the air outlet are connected to the accommodation space. The impeller is located in the accommodation space. The impeller includes a hub, a plurality of blades, and at least one heat conductive annular portion. The hub is rotatably disposed in the impeller housing. The plurality of blades are connected to an outer circumferential surface of the hub. The at least one heat conductive annular portion is connected to the plurality of blades.

A ceiling-inserted fan includes a case having an air inlet on a bottom surface of the case and an air outlet on a side surface of the case, an adapter plate having a rectangular opening and forming at least part of the side surface of the case, a duct-connecting adapter protruding outward the adapter plate and an air-sending part for directing air from the air inlet to the air outlet. The duct-connecting adapter is separated from the adapter plate and includes a sealing section that contacts with a peripheral section of the rectangular opening inside the case and a locking section that contacts with the peripheral section of the rectangular opening outside the case. The sealing section and the locking section removably holds the peripheral section.

The present disclosure relates to an electric pump including a housing defining an inlet and an outlet. The electric pump includes a rotor and stator within the housing. The rotor is liquid cooled by working fluid of the pump and the stator is positioned in a dry chamber that is sealed to prevent the working fluid from entering the dry chamber. A heat exchanger is used to cool the stator. An impeller driven by the rotor draws working fluid into the housing through the inlet. The working fluid passes through the heat exchanger to draw heat from the stator before reaching the impeller. The working fluid is discharged from the housing through the outlet by the impeller.

A blower motor is provided and includes a support assembly provided with a first stop step surface, a stator assembly disposed in the support assembly, a rotor assembly disposed in the stator assembly and an end cover disposed on the stator assembly and abutted against the support assembly and provided with a second stop step surface. The rotor assembly includes a rotating shaft and two ends of the rotating shaft are respectively provided with a first bearing and a second bearing. A resilient gasket is provided on one of the first stop step surface and the second stop step surface. The bearings are positioned by springs and cooperate with the resilient gasket to apply a tightening force to the bearings, which can reduce clearances in the bearings and effectively prevent balls in the bearings from making noise under a high-frequency vibration.

Rotor systems including an engine shaft, a forward hub, a rear hub, a rotor disk arranged between the forward hub and the rear hub, and a seal tube configured to define a forward hub compartment and a rear hub compartment. The forward hub compartment is defined forward of the rotor disk and the rear hub compartment is defined aft of the rotor disk. The seal tube is connected at a forward end to at least one of the rotor disk and the engine shaft and at a rear end to at least one of the rear hub and the engine shaft and the seal tube includes at least one axial compliance element configured to enable axial extension and compression of the seal tube in an axial direction along the engine shaft.

Provided are a vacuum pump and an adapter used in the vacuum pump that are capable of responding to various changes in specifications at low cost. A turbo-molecular pump includes a base, a stator blade that is provided above the base in an axial direction of a rotor, a rotor blade that is integrally attached to the rotor, a housing that is formed in a cylindrical shape, and accommodates the stator blade and is integrally attached to the base, and an adapter that is replaceable depending on a type of the stator blade, the rotor blade, or the housing, and that is detachably mounted on the base and is configured to support the stator blade in the axial direction.