Noise reduction devices for blowers

Abstract

A noise reduction device for a blower includes a noise reduction member. The noise reduction member has a noise reduction chamber and a noise reduction opening defined therein, so that a part of air flowing into, through or out of the blower can enter the noise reduction chamber via the noise reduction opening.

1 . A blower comprising:
 a body housing having an air inlet portion and an air outlet portion defining an air inlet passage and an air outlet passage, respectively; and   a rotary fan disposed within the body housing;   wherein the body housing includes a noise reduction portion having a noise reduction chamber and a noise reduction hole; and   wherein the noise reduction chamber communicates with one of the air inlet passage and the air outlet passage via the noise reduction hole.   
     
     
         2 . The blower as in  claim 1 , wherein the noise reduction chamber is disposed in juxtaposed relationship with one of the air inlet passage and the air outlet passage. 
     
     
         3 . The blower as in  claim 1 , wherein the noise reduction chamber communicates with the air outlet passage via the noise reduction hole. 
     
     
         4 . The blower as in  claim 1 , wherein:
 the body housing is split into a left housing half and a right housing half joined together to form the body housing, the left housing half and the right housing half being positioned on a left side and a right side with respect to a direction of flow of air within one of the air inlet passage and the air outlet passage; and   the noise reduction portion is split into a left portion and a right portion corresponding to the left housing half and the right housing half, respectively.   
     
     
         5 . The blower as in  claim 4 , wherein:
 each of the left housing half and the right housing half is molded by resin,   the left housing half has a first portion and a first wall integrated with the first portion;   the right housing half has a second portion and a second wall integrated with the second portion;   the air outlet passage of the air outlet portion is defined between the first portion and the second portion; and   the noise reduction chamber and the noise reduction hole of the noise reduction portion are defined between the first wall and the second wait.   
     
     
         6 . The blower as in  claim 1 , wherein a volume of the noise reduction chamber and a diameter of the noise reduction hole are determined based on the number of fins of the fan and the rotational speed of the fan. 
     
     
         7 . A noise reduction device for a blower having a body housing and a rotary fan, the body housing having an air inlet portion and an air outlet portion defining an air inlet passage and an air outlet passage therein, respectively, and the rotary fan being disposed within the body housing; the noise reduction device comprising:
 a tubular member capable of mounting to one of the air inlet portion and the air outlet portion;   wherein the tubular member defines therein an air blowing passage, a noise reduction chamber and a noise reduction hole;   wherein the air blowing passage communicates with one of the air inlet passage and the air outlet passage when the tubular member is mounted to one of the air inlet portion and the air outlet portion;   wherein the noise reduction chamber communicates with the air blowing passage via the noise reduction hole.   
     
     
         8 . The noise reduction device as in  claim 7 , wherein the noise reduction chamber is disposed in juxtaposed relationship with the air blowing passage. 
     
     
         9 . A noise reduction device for a blower, comprising:
 a noise reduction member having a noise reduction chamber and a noise reduction opening defined therein, so that a part of air flowing into, through or out of the blower can enter the noise reduction chamber via the noise reduction opening.   
     
     
         10 . The noise reduction device as in  claim 9 , wherein the noise reduction member further includes an air blowing passage defined therein and communicating with the noise reduction chamber via the noise reduction opening, and air flowing into through or out of the blower can enter the air blowing passage. 
     
     
         11 . The noise reduction device as in  claim 10 , wherein the blower has a rotary fan for producing a stream of air, and a volume of the noise reduction chamber and a diameter of the noise reduction hole are determined based on the number of fins of the fan and the rotational speed of the fan. 
     
     
         12 . A blower comprising the noise reduction device as in  claim 9 , wherein:
 the blower includes a housing body having an air inlet portion and an air outlet portion defining an air inlet passage and an air outlet passage therein, respectively;   the noise reduction member is formed integrally with the housing body; and   the noise reduction opening communicates between the noise reduction chamber and one of the air inlet passage and the air outlet passage.