Low-noise bladeless fan

Abstract

A low-noise bladeless fan includes a base, a nozzle at the top of the base and noise-reduction components located within the base. The noise-reduction components include a first noise-reduction component, a second noise-reduction component and a third noise-reduction component. The first noise-reduction component is located at an interface between air outlets and an internal passage for airflow reduces noise by isolating, obstructing and separating noise created inside the outer casing. The second noise-reduction component is disposed within an impeller fixture reduces noise by absorbing noise created inside the outer casing. Through-holes are disposed in the bottom of the outer casing act as the third noise-reduction component and also reduce noise. The arrangement of noise-reduction components can reduce noise created in the fan, thereby cooling users with natural and soft wind.

1 . A low-noise bladeless fan, comprising a base provided with an impeller fixture and a nozzle located at the top of the base, wherein,
 the nozzle comprises an internal passage for receiving airflow through air outlets and an exhaust port, the internal passage is annular and forms a continuous loop or pipe within the nozzle, the exhaust port comprises a conical region tapered to an exit;   being a component which is internally hollow and provided with through-holes in the outer wall thereof, the impeller fixture contiguously or alternately surrounds the impeller, with one of the possible shapes thereof being annular;   within the base, noise-reduction components are set and comprise: a first noise-reduction component, and a second noise-reduction component. Wherein the first noise-reduction component is set on the inner wall of the outer casing, at the interface between the air outlets and the internal passage, and in the space between the outer side of the impeller and the inner wall of the outer casing, for isolating, obstructing and separating noise created inside the outer casing during the operation of the fan;   the second noise-reduction component is disposed within the impeller fixture, with its position and shape matching the position and the shape of the impeller fixture, for absorbing noise created inside the outer casing.   
     
     
         2 . The low-noise bladeless fan as claimed in  claim 1 , wherein,
 the nozzle extends substantially orthogonally about the axis to define an opening, the opening having a shape which is circular in an inner track thereof and egg-shaped in an outer track thereof.   
     
     
         3 . The low-noise bladeless fan as claimed in  claim 1 , wherein,
 the first noise-reduction component is trapezoidally distributed from the outer casing to the air outlets along the inner wall of the outer casing, with the sectional area in the vicinity of the air outlets smaller than the sectional area in the vicinity of the air inlets, and there is a gap between the first noise-reduction component and the impeller.   
     
     
         4 . The low-noise bladeless fan as claimed in  claim 3 , wherein,
 the first noise-reduction component is made of steel plates, lead plates, brick walls or other materials of a greater density.   
     
     
         5 . The low-noise bladeless fan as claimed in  claim 4 , wherein,
 the first noise-reduction component is made of one of the materials or any combination of several of them.   
     
     
         6 . The low-noise bladeless fan as claimed in  claim 2 , wherein,
 the first noise-reduction component is trapezoidally distributed from the outer casing to the air outlets along the inner wall of the outer casing, with the sectional area in the vicinity of the air outlets smaller than the sectional area in the vicinity of the air inlets, and there is a gap between the first noise-reduction component and the impeller.   
     
     
         7 . The low-noise bladeless fan as claimed in  claim 6 , wherein,
 the first noise-reduction component is made of steel plates, lead plates, brick walls or other materials of a greater density.   
     
     
         8 . The low-noise bladeless fan as claimed in  claim 7 , wherein,
 the first noise-reduction component is made of one of the materials or any combination of several of them.   
     
     
         9 . The low-noise bladeless fan as claimed in  claim 1 , wherein,
 the second noise-reduction component is entirely or partially filled within the impeller fixture.   
     
     
         10 . The low-noise bladeless fan as claimed in  claim 9 , wherein,
 the second noise-reduction component is made of slag wool, blankets or other porous sound-absorbing materials.   
     
     
         11 . The low-noise bladeless fan as claimed in  claim 10 , wherein,
 the second noise-reduction component is made of one of the materials or any combination of several of them.   
     
     
         12 . The low-noise bladeless fan as claimed in  claim 2 , wherein,
 the second noise-reduction component is entirely or partially filled within the impeller fixture.   
     
     
         13 . The low-noise bladeless fan as claimed in  claim 12 , wherein,
 the second noise-reduction component is made of slag wool, blankets or other porous sound-absorbing materials.   
     
     
         14 . The low-noise bladeless fan as claimed in  claim 13 , wherein,
 the second noise-reduction component is made of one of the materials or any combination of several of them.   
     
     
         15 . The low-noise bladeless fan as claimed in  claim 1 , wherein,
 the noise-reduction components further comprise a third noise-reduction component which is through-holes disposed in the bottom of the outer casing.   
     
     
         16 . The low-noise bladeless fan as claimed in  claim 2 , wherein,
 the noise-reduction components further comprise a third noise-reduction component which is through-holes disposed in the bottom of the outer casing.