A centrifugal blower includes a blower base, multiple blades fastened to the blower base, a hub integrated to a central portion of the blower base, and a top shroud to provide surrounding coverage to the multiple blades. The centrifugal blower is housed within an evaporator. The centrifugal blower may operate at operating speeds that are lower than those of typical or currently known implementations while generating an airflow that meets or even exceeds those of the typical or currently known implementations.

The present disclosure provides a vacuum pump with which size and weight reduction, improvement of workability, and cost reduction can be realized. Electrical connection between a pump main body that has a rotor supported by a magnetic bearing and a control unit that controls the drive of the pump main body is established by a flexible printed wiring board configured by printing an electric circuit on a surface of a sheet-like insulating substrate.

An impeller for a viscous flow fan includes a hub having a longitudinal axis, and a plurality of ring-shaped wave blades disposed about and coupled to a perimeter of the hub, the wave blades disposed in a parallel and spaced apart from one another along the longitudinal axis by a blade gap. Each wave blade includes a center coincident with the longitudinal axis, an inner perimeter, an outer perimeter, and a wave-like cross-section about the perimeter of the hub in a direction perpendicular to the longitudinal axis, wherein at least a portion of the inner perimeter of at least one of the wave blades is spaced from the perimeter of the hub to form an air intake gap.

An impeller includes a main plate, an annular side plate and blades. The blades each have: an inner circumferential end; an outer circumferential end; a sirocco blade portion formed as a forward-swept blade portion, and having an outlet angle that is greater than 90 degrees; and a turbo blade portion formed as a swept-back blade portion and including the inner circumferential end. The blades include a first blade portion and a second blade portion that are provided on respective sides of the main plate. The impeller including a region in which a first inter-blade distance is greater than a second inter-blade distance, where an inlet-blade distance is a distance between any adjacent two of the blades in the circumferential direction, the first inter-blade distance is the inter-blade distance of the first blade portion, and the second inter-blade distance is the inter-blade distance of the second blade portion.

A fan wheel (1) has a bottom disc (4), a cover disc (3) and impeller blades (2) arranged around a rotation axis (RA) of the fan wheel (1). The blades, in each case, extend over a blade length from a blade leading edge (5) to a blade trailing edge (6). The impeller blades (2) are divided into a front section (10), rear section (12) and transition section (11). The front section (10), extends proceeding from the blade leading edge (5) in the direction of the blade trailing edge (6). The rear section (12) extends proceeding from the blade trailing edge (6), in the direction of the blade leading edge (5). The transition section (11) forms a transition between the front section (10) and the rear section (12). The impeller blades (2) are formed with opposite curvature in the course from the bottom disc (4) to the cover disc (3) in the front section (10) and the rear section (12).

Embodiments of the invention provide a blowing apparatus comprising a body including an impeller equipped with vanes including an opening therein to allow air to pass through the vane when the impeller is rotating.

The present invention relates to a blower. A blower according to an embodiment of the present invention comprises: a lower case having a suction hole in through which air flow; an upper case which is disposed at the upper side of the lower case and which has a discharge port through which the air is discharged; a fan motor for providing rotating force; and a fan disposed inside the lower case and fixed to a motor shaft of the fan motor, wherein the fan includes: a hub having an outer surface, which is extended to be inclined at a first angle with respect to the motor shaft; a plurality of blades coupled to the hub; and a shroud having an inner surface which is extended to be inclined, with respect to the motor shaft, at a second angle that is greater than the first angle, and which faces the outer surface of the hub with respect to the blade, and thus the air discharged from the fan can change into an ascending current.

A centrifugal fan includes first blades and second blades connected via a separation plate. A side plate supports the first blades located on one side in an axial direction, and a main plate supports the second blades on the other side in the axial direction. The separation plate has an inner diameter larger than or equal to an outer diameter of the main plate and larger than or equal to a largest inner diameter of the second blade. The separation plate has an outer diameter smaller than or equal to an inner diameter of the side plate and smaller than or equal to a smallest outer diameter of the first blade.

An impeller apparatus includes a housing, an impeller, and a heat generation member. The housing includes an air duct formed in the housing. The air duct includes a first air duct and a second air duct successively connected to each other. The second air duct has a non-blocking area. The impeller is arranged in the first air duct. The heat generation member is rotatably arranged in the second air duct and has a blocking state and a non-blocking state. In the blocking state, the heat generation member blocks the second air duct, in the non-blocking state, the heat generation member is accommodated in the non-blocking area and does not block the second air duct.