A pressurized treatment gas supply device has a lower enclosure and an upper enclosure. The air outlet is formed by part of the upper enclosure and lower enclosure and the gas outlet direction is tangent to the outer surface of the enclosure. The lower enclosure is has an annular wall A and an outer wall. The space between the outer wall and the upper enclosure wall forms a gas path leading to the gas outlet. A motor is located on the inner side of the lower enclosure. The output shaft end of motor is arranged on the lower enclosure and output shaft of the motor is connected to an impeller. An gas inlet structural member is arranged on the lower enclosure, the end that opposite to impeller is axial air inlet end. The noise silencing chamber is formed between the top of air inlet structural member and the annular frame.

Blowers having noise reduction features are provided. A blower may include a main body defining an airflow path therethrough, the main body extending between and defining an inlet end and an outlet end. The blower may further include an inlet muffler provided at the inlet end. The inlet muffler includes a plurality of inlet ports, each of the plurality of inlet ports including a peripheral surface defining a port aperture therethrough. At least one of the plurality of inlet ports further includes a damper material provided on the peripheral surface of the at least one inlet port and further defining the port aperture therethrough.

The present invention provides a silencer, including: a silencer housing having an annular plate-like structure, with an annular mounting chamber formed therein; a silencing pad disposed in the mounting chamber; and a positioning portion disposed on the silencer housing and used for fastening the silencer housing. The silencer according to the embodiment of the present invention has an integrated structure, and can desirably avoid the problem of mounting unflatness in a separated structure. Moreover, the silencing pad therein is disposed to surround the entire silencer, which can provide a sound absorption and noise reduction effect more efficiently.

A centrifugal fan includes: a fan blades; and a scroll casing housing the fan, the scroll casing including a discharge portion, and a scroll portion including a side wall, a circumferential wall, and a tongue portion. In the circumferential wall, at a first end between the circumferential wall and the tongue portion, and at a second end between the circumferential wall and the discharge portion, a distance between an axis of the rotational shaft and the circumferential wall is equal to a distance between the axis of the rotational shaft and a standard circumferential wall, and is greater than or equal to the distance between the first end and the second end of the circumferential wall, the circumferential wall including a plurality of extended portions between the first end and the second end of the circumferential wall.

The invention relates to a compressor, in particular a gas compressor, for instance for a turbocharger, for compressing a gaseous fluid, having a compressor housing (40) in which a compressor wheel (41) is rotatably arranged, wherein the compressor housing (40) has a gas intake manifold (43), via which gas can be fed to the compressor wheel (41), a compressor duct (42) being provided, via which the compressed gas can be discharged from the compressor wheel (41), an adjustment device (60) being arranged in the area of the gas intake manifold (43), wherein the adjustment device (60) has orifice elements (70), which can be adjusted linearly between a closed position and an open position, and by means of which the opening cross-section of the gas intake manifold (43) in a duct area can be varied in order to form a minimum opening cross-section (Ömin) in the closed position and a maximum opening cross-section (Ömax) in the open position, wherein in each case two adjacent orifice elements (70) have sealing segments (73.1, 76.1) which, in the closed position, face each other, in particular rest against each other. To be able to reduce the noise emissions in such a compressor in a simple and effective manner, provision is made according to the invention that the orifice elements (70) can be adjusted into a retracted operating position, in which body areas of the orifice elements (70) at least in some areas delimit a recess, in particular a circumferential groove, in the gas intake manifold (43) to form a resonator, in particular a Helmholtz resonator, and wherein provision may in particular be made that the orifice elements (70) can be adjusted, preferably continuously, between several retracted operating positions.

A fan wheel has a hub cup and a plurality of blades extending radially outward from an outer wall of the hub cup, which is in particular at least substantially cylindrical. Each blade has a leading edge and a trailing edge, wherein for at least one blade, the progression of a relative position of the blade's leading edge and/or the progression of a relative position of the blade's trailing edge has an aperiodically wave-like shape. There is also described a radiator fan module with a fan wheel of the type described above, and a motor vehicle with such a radiator fan module.

An air-sending device includes a propeller fan, a bell mouth surrounding an outer periphery of the propeller fan, a fan grille disposed downstream of the bell mouth and including a plurality of first crosspieces. An edge of the air outlet of the bell mouth includes a varying portion whose distance from a rotation axis of the propeller fan varies. In a cross-section of any of the plurality of first crosspieces that is perpendicular to a longitudinal direction of the any of the plurality of first crosspieces, a virtual line segment connecting an upstream side end portion and a downstream side end portion is defined as a first virtual line segment. At the portions of the plurality of first crosspieces disposed on the inner circumference side of the varying portion, the angle between a virtual line segment parallel to the rotation axis and the first virtual line segment is changed.

The self-ventilated motor (10) comprises a casing (12) having an air inlet opening (18) and an air outlet opening (20) and delimiting an air passage between the air inlet opening (18) and the air outlet opening (20), drive means (13) comprising a shaft (22) housed in the casing (12), a ventilation propeller (24) connected to the shaft (22) upon rotation and housed in the air passage, and a noise reduction device (26). The noise reduction device (26) comprises a first noise reduction member (28), attached to the casing (12) at the air inlet opening (18), a second noise reduction member (30) arranged on the ventilation propeller (24), and a third noise reduction member (32) fixed to the casing (12) at the air outlet opening (20).

A blowing apparatus includes a blowing unit, a first circuit board, a second circuit board, a top casing, a middle casing, and a bottom casing. The bottom casing has an intake hole. The middle casing has a nozzle to which a tube is attached, and also has an exhaust hole inside the nozzle. The exhaust hole is connected to a mask, with the tube interposed therebetween. The blowing unit includes a fan and a motor configured to rotate the fan. The blowing unit is located in a region between the first circuit board and the second circuit board. The first circuit board intersects a rotation axis of the fan. The first circuit board covers the blowing unit as viewed from the top casing in plan view of the first circuit board.

A hand-guided working apparatus has a radial fan. The radial fan includes a fan impeller and an air duct, which has a spiral portion surrounding the fan impeller and has a duct cross section, which increases in the air flow direction. An outlet funnel portion adjoins the spiral portion, widens in a funnel shape in the air flow direction and has a radially inner boundary wall and a radially outer boundary wall. The outlet funnel portion ends in an air outlet opening, the outlet width of which is smaller than an outside diameter of the fan impeller. The radially inner and/or the radially outer boundary wall of the outlet funnel portion has a curvature opposed to that of the spiral portion. An intermediate wall is arranged in the outlet funnel portion, between the radially inner and the radially outer boundary wall. The intermediate wall extends with a curvature opposed to that of the spiral portion and divides the outlet funnel portion into two component portions, each widening in the shape of a funnel in the air flow direction.