A hand vacuum cleaner may include a suction motor and fan assembly that is positioned downstream of a pre-motor filter. A post motor filter may be positioned downstream of the suction motor and fan assembly and may be in the lower end of the hand vacuum cleaner and an energy storage member may be in an upper end of the handle.

An upright vacuum cleaner with one or more features, such as a top opening rigid container, a headlight, a replaceable power cord a motor housing suspended within the vacuum to reduce noise and/or vibration a clutch assembly with a RPM sensor, and/or one or more filter plates to improve airflow.

A cyclone separation device includes a cyclone chamber for separating dirt from incoming air, a dirt collecting chamber arranged adjacent to the cyclone chamber for collecting dirt particles separated from air, and a dirt duct between the cyclone chamber and the dirt collecting chamber for allowing dirt particles to exit the cyclone chamber into the dirt collecting chamber. To reduce the generation of noise-generating air vortices, the dirt duct has an edge protruding into a direction at an angle to the dirt duct at an exit ridge of the cyclone chamber that is first encountered by the air rotating in the cyclone chamber. Preferably, the edge is formed by a tangential extension of a wall of the cyclone chamber. A vacuum cleaner advantageously includes such a cyclone separation device.

A cleaning device includes an improved structure in which cleaning performance can be improved. The cleaning device includes an inhalation unit to generate inhalation force to inhale air into a main body, wherein the inhalation unit includes: an impeller that is rotatable; an impeller cover having an inlet damper formed therein; and a return channel coupled to the impeller cover so that the impeller can be accommodated in the return channel, wherein the return channel includes: an inner frame; and an outer frame placed at an outer side of the inner frame so as to be spaced apart from the inner frame, and a plurality of wings are disposed between the inner frame and the outer frame.

An electric powered work machine according to one aspect of the present disclosure includes a first and a second digital filters, a control sound source, an error sensor, and a characteristics adjustor. The first digital filter includes a series of taps and generates a control signal. The control sound source produces an artificial noise in accordance with the control signal. The error sensor converts a synthesized sound of the artificial noise and a target noise at a canceling location to an error signal. The second digital filter includes N taps and generates a filtered reference signal. The characteristics adjustor uses the error signal and the filtered reference signal to adjust a coefficient of each tap of M taps in the series of taps. Each of M and N is a positive integer satisfying M<N.

A cleaner reduces noise. The cleaner includes a motor assembly including a motor and a fan rotatable about a rotation axis with a rotational force generated by the motor, a cover surrounding the motor assembly, a guide that guides air from the fan at least partially to an outer surface of the cover, and a rib assembly that guides the air guided by the guide at least partially in a circumferential direction about the rotation axis along the outer surface of the cover.

Provided is a structure including a sound absorption section provided in an air flow path on an exhaust side of a fan, traversing a joint portion between a first main housing and a second main housing. The sound absorption section has a double wall structure including an inner wall facing the air flow path and an outer wall spaced outward from the inner wall. A sound absorption member is interposed in a sound absorption chamber between the inner wall and the outer wall of the sound absorption section. A communication hole communicating with the air flow path and the sound absorption chamber is formed in the inner wall of the sound absorption section at a position away from the joint portion.

An improved shop vacuum with wet/dry capability uses a vacuum tube that terminates in a space between the canister and the vacuum compartment such that the substance and content exiting the vacuum tube is not directly opposed the negative pressure source. This allows the substance to drain into the canister in a more controlled and less volatile condition, reducing splashing and entrainment of the substance. Moreover, a second exit for the vacuum has been added to the canister to improve the efficiency of the vacuum and the overall performance of the device.

Ergonomic gripping mechanisms of handheld air movement apparatuses are provided. A handheld air movement apparatus may include a handle portion and a tool portion. The handle portion may include a grip, a trigger, and a handle pivot. The grip may have first and second ends. The trigger may be positioned toward the first end of the grip and the handle pivot may be positioned toward the second end of the grip. The tool portion may include a housing, a nozzle coupled to the housing, and a handle connection base. The tool portion may provide air movement into and/or out of the nozzle in response to a signal received from the trigger of the handle portion. The handle connection base of the tool portion may be pivotally coupled to the handle portion at the handle pivot to provide directional height adjustment of the tool portion with respect to the handle portion.

A vacuum cleaner (1; 1B) includes a housing (2; 100) that houses a fan (7) and a motor (8), which generates power that rotates the fan (7); one or more air-exhaust ports (10), which is provided in at least a portion of the housing (2; 100); and a sound-absorbing member (33) having a through hole (33). The sound-absorbing member (33) is disposed in an interior space of the housing (2; 100) so as to face the air-exhaust port(s) (10).