The invention relates to a fluid pump that has an electric motor with a shaft and an impeller with an outer diameter, that is connected to the shaft for conjoint rotation. A maximum volumetric flow and a maximum pressure difference (dp) can be generated in the fluid pump by the rotating impeller. A characteristic index number (K) for the fluid pump is greater than 350 kW/m.sup.2. The index number (K) corresponds to the product of the maximum volumetric flow and the maximum pressure difference in the fluid pump divided by the square of the outer diameter of the impeller.

A heat-dissipation fan includes a rotary assembly and a plurality of rotary cylinders mounted on an outer surface of the rotary assembly to serve as cylindrical fan blades of the heat-dissipation fan. The rotary assembly includes a plurality of first electrical conducting units and a second electrical conducting unit. The rotary cylinders move along with the rotary assembly when the latter rotates and are correspondingly electrically connected to the first electrical conducting units to be rotatable about their respective centerlines.

A motor-compressor unit for sub-sea applications, including a pressure casing, and an electric motor housed in a motor compartment formed in the pressure casing and a compressor housed in a compressor compartment formed in the pressure casing. A shaft drivingly connects the electric motor and the compressor. At least one magnetic bearing rotatingly supports the shaft and a control system is provided for controlling the magnetic bearing. The control system is housed in a control system compartment structurally connected to and supported by the pressure casing.

A motor-compressor unit for sub-sea applications, including a pressure casing, and an electric motor housed in a motor compartment formed in the pressure casing and a compressor housed in a compressor compartment formed in the pressure casing. A shaft drivingly connects the electric motor and the compressor. At least one magnetic bearing rotatingly supports the shaft and a control system is provided for controlling the magnetic bearing. The control system is housed in a control system compartment structurally connected to and supported by the pressure casing.

A fan includes a shell, a hub and an impeller. The base cover and the cover plate are arranged in parallel, and the side shell is arranged between the base cover and the cover plate. The cover plate is provided with an air inlet connected with the accommodating chamber and having a diameter smaller than a diameter of the impeller, and the side shell is provided with an air outlet connected with the accommodating chamber. The hub is pivotally installed in the accommodating chamber, the hub and the air inlet are arranged coaxially, and the impeller is arranged in the accommodating chamber and connected with the hub to produce air flow. The cover plate is defined as a first arrangement zone with a plurality of first auxiliary air inlet holes provided. The fan can increase air volume and suppress air leakage.

A fan includes a shell, a hub and an impeller. The base cover and the cover plate are arranged in parallel, and the side shell is arranged between the base cover and the cover plate. The cover plate is provided with an air inlet connected with the accommodating chamber and having a diameter smaller than a diameter of the impeller, and the side shell is provided with an air outlet connected with the accommodating chamber. The hub is pivotally installed in the accommodating chamber, the hub and the air inlet are arranged coaxially, and the impeller is arranged in the accommodating chamber and connected with the hub to produce air flow. The cover plate is defined as a first arrangement zone with a plurality of first auxiliary air inlet holes provided. The fan can increase air volume and suppress air leakage.

In accordance with embodiments of the present disclosure, a blower module assembly may include a housing, a blower mechanically coupled to the housing, and an airflow guide mechanically coupled between the housing and the blower. The blower may be mechanically coupled to the housing, may have an intake and an exhaust, and may be configured to move air from the intake to the exhaust. The airflow guide may be mechanically coupled between the housing and the blower, may have a solid region and a plenum region such that the border between the solid region and the plenum region is defined by a portion of an arcuate cylinder. The housing, the blower, and the airflow guide may be arranged such that a plenum is defined by surfaces of the housing, the blower, and the portion of the arcuate cylinder, the plenum adjacent to the intake.

In accordance with embodiments of the present disclosure, a blower module assembly may include a housing, a blower mechanically coupled to the housing, and an airflow guide mechanically coupled between the housing and the blower. The blower may be mechanically coupled to the housing, may have an intake and an exhaust, and may be configured to move air from the intake to the exhaust. The airflow guide may be mechanically coupled between the housing and the blower, may have a solid region and a plenum region such that the border between the solid region and the plenum region is defined by a portion of an arcuate cylinder. The housing, the blower, and the airflow guide may be arranged such that a plenum is defined by surfaces of the housing, the blower, and the portion of the arcuate cylinder, the plenum adjacent to the intake.

Radial fan has tapered tongue geometry, impeller with impeller blades extending in radial direction about axis of rotation, and volute casing accommodating impeller rotatable about axis of rotation. Impeller blades each have a radially outward end edge, and end edges directly adjacent in circumferential direction that span an imaginary surface therebetween. Volute casing has outlet port for radially ejecting a fluid flow by impeller that is delimited in circumferential direction about axis of rotation by a tongue. At transition to a spiraled casing part of volute casing, the tongue has radially inward inner edge with two sections transitioning into one another via an extremum at a transition point. At least one section is inclined relative to axis of rotation and/or relative to radially outward end edges of impeller blades and intersects with at least one radially outward end edge and adjacent lateral surface up to its center in radial direction.

Radial fan has tapered tongue geometry, impeller with impeller blades extending in radial direction about axis of rotation, and volute casing accommodating impeller rotatable about axis of rotation. Impeller blades each have a radially outward end edge, and end edges directly adjacent in circumferential direction that span an imaginary surface therebetween. Volute casing has outlet port for radially ejecting a fluid flow by impeller that is delimited in circumferential direction about axis of rotation by a tongue. At transition to a spiraled casing part of volute casing, the tongue has radially inward inner edge with two sections transitioning into one another via an extremum at a transition point. At least one section is inclined relative to axis of rotation and/or relative to radially outward end edges of impeller blades and intersects with at least one radially outward end edge and adjacent lateral surface up to its center in radial direction.