Airflow generator

Abstract

The disclosure provides an airflow generator. The airflow generator includes a casing, a fan blade and a muffling part. The casing has an air inlet, an air outlet, an accommodating space and a bypass opening connected to one another. The fan blade is disposed in the accommodating space. The muffling part is located outside the accommodating space and is disposed at the bypass opening. The muffling part has an airflow channel, and the airflow channel is connected to the accommodating space via the bypass opening. The fan blade is capable of sucking ambient air into the accommodating space via the air inlet so as to create an air current throughout the accommodating space and to force the air current to flow into the airflow channel via the bypass opening.

What is claimed is: 
     
         1 . An airflow generator, comprising:
 a casing having an air inlet, an air outlet, an accommodating space and a bypass opening connected to one another;   a fan blade disposed in the accommodating space, and   a muffling part located outside the accommodating space and disposed at the bypass opening, the muffling part having an airflow channel, and the airflow channel connected to the accommodating space via the bypass opening;   wherein, the fan blade is capable of sucking ambient air into the accommodating space via the air inlet so as to create an air current throughout the accommodating space and to force the air current to flow into the airflow channel via the bypass opening.   
     
     
         2 . The airflow generator according to  claim 1 , further comprising a porous member, the porous member disposed at the bypass opening and having a plurality of pores connected to the accommodating space and the airflow channel. 
     
     
         3 . The airflow generator according to  claim 1 , wherein the airflow channel has a length equal to one fourth of a wavelength of a blade passing frequency of the fan blade. 
     
     
         4 . The airflow generator according to  claim 1 , wherein the casing comprises a first plate, a second plate and a side wall, the first plate and the second plate are respectively connected to two opposite sides of the side wall, the first plate, the second plate and the side wall together form the accommodating space and the air outlet, the air inlet is located on the first plate, the bypass opening is located on the side wall, the bypass opening divides the side wall into a first wall section and a second wall section, the second wall section comprises a connecting portion and a tongue portion connected to each other, the connecting portion is located between and connected to the bypass opening and the tongue portion. 
     
     
         5 . The airflow generator according to  claim 4 , wherein a reference line is defined to pass through a rotating axis of the fan blade and to be perpendicular to a plane where the air outlet is located, and the bypass opening and the tongue portion are respectively located at two opposite sides of the reference line. 
     
     
         6 . The airflow generator according to  claim 1 , wherein the muffling part comprises a longer side plate, a shorter side plate, a upper plate, a lower plate and an end plate, the longer side plate comprises an extension part and a guiding part connected to each other, the longer side plate, the shorter side plate, the upper plate, the lower plate and the end plate together form the airflow channel, the extension part of the longer side plate, the shorter side plate, the upper plate and the lower plate are respectively connected to sides of the end plate, and the guiding part of the longer side plate, the shorter side plate, the shorter side plate, the upper plate and the lower plate are respectively connected to edges of the bypass opening. 
     
     
         7 . The airflow generator according to  claim 1 , wherein the muffling part and the casing are of one piece. 
     
     
         8 . The airflow generator according to  claim 1 , wherein the muffling part is detachably mounted on the casing. 
     
     
         9 . The airflow generator according to  claim 1 , wherein the muffling part is a made of a hard material. 
     
     
         10 . The airflow generator according to  claim 1 , wherein the muffling part is a made of a soft material. 
     
     
         11 . The airflow generator according to  claim 1 , wherein the porous member is a sponge.