Drainage Device with a Low-Noise Radiator Fan for Air-Conditioning Equipment

Abstract

A drainage device with a low-noise radiator fan for air-conditioning equipment is disclosed to include a housing, a motor, a radiator fan, a drainage shell, and a drainage blade. The motor is mounted in the housing. The radiator fan includes a plate member, fan blades arranged at a bottom side of the plate member around the border area, and a ring cap covering the fan blades at a bottom side and having an air passage hole at the center thereof. Thus, the ring cap forces hot air to flow through the air passage hole of the ring cap into the inside of the radiator fan to prevent wind shear disturbance, enabling the intake flow of hot air to be further guided by the fan blades to the atmosphere to significantly reduce the level of air exhaust noise.

1 . A drainage device with a low-noise radiator fan for air-conditioning equipment, comprising:
 a housing comprising a bottom shell and a cover shell, said cover shell comprising a plurality of vent holes spaced around the periphery thereof;   a motor mounted in said cover shell of said housing and having a driving shaft;   a radiator fan mounted in said cover shell above said motor, said radiator fan comprising a plate member located at a top side thereof, a plurality of fan blades circumferential bowed and equiangularly arranged at a bottom side of said plate member around the border area thereof, a ring cap covering said fan blades at a bottom side opposite to said plate member, said ring cap comprising an air passage hole at the center thereof;   a drainage shell mounted in said bottom shell with a concave thereof facing upward; and   a drainage blade mounted in said drainage shell;   wherein the driving shaft is mounted in said housing and axially inserted through the center of said radiator fan and the center of said motor and the center of said drainage blade and connected therewith for synchronous rotation.   
     
     
         2 . The drainage device with a low-noise radiator fan for air-conditioning equipment as claimed in  claim 1 , wherein the border edge of the cross section of the inner perimeter of said air passage hole is circularly arched. 
     
     
         3 . The drainage device with a low-noise radiator fan for air-conditioning equipment as claimed in  claim 1 , wherein the diameter of said air passage hole is smaller than the diameter of the space surrounded by said fan blades. 
     
     
         4 . The drainage device with a low-noise radiator fan for air-conditioning equipment as claimed in  claim 1 , wherein said radiator fan further comprises a flange extending around the outer perimeter of said ring cap.