Motor assembly and vacuum cleaner having the same

Abstract

A motor assembly includes: a suction motor; at least one inner casing adapted to enclose at least a part of the suction motor; and at least one outer casing configured to enclose at least a part of the at least one inner casing, wherein a diffusion passage is formed between the at least one inner casing and the at least one outer casing and has an average cross-section that gradually increases to allow air to diffuse therein.

1 . A motor assembly, comprising: 
 a motor;    at least one inner casing adapted to enclose at least a part of the motor; and    at least one outer casing configured to enclose at least a part of the at least one inner casing,    wherein a diffusion passage is formed between the at least one inner casing and the at least one outer casing and has an average cross-section that gradually increases to allow air to diffuse therein.    
   
   
       2 . The motor assembly as claimed in  claim 1 , wherein the average cross-section gradually increases along a direction of air flow.  
   
   
       3 . The motor assembly as claimed in  claim 1 , wherein the at least one inner casing comprises: 
 a first inner casing having a first air passing hole through which air is drawn into the motor; and    a second inner casing having a second air passing hole through which air is discharged to the diffusion passage.    
   
   
       4 . The motor assembly as claimed in  claim 3 , wherein a third air passing hole is formed in the at least one outer casing opposite to the second air passing hole, and air is discharged from the diffusion passage through the third air passing hole.  
   
   
       5 . A vacuum cleaner, comprising: 
 a cleaner body having an air suction pipe and a discharge pipe;    a motor disposed at the cleaner body;    at least one inner casing configured to enclose at least a part of the motor and to enable fluid communication with the air suction pipe; and    at least one outer casing enclosing at least a part of the inner casing and configured to enable fluid communication with the air discharge pipe,    wherein a diffusion passage is formed between the at least one inner casing and the at least one outer casing and has an average cross-section that gradually increases to allow the air to diffuse therein.    
   
   
       6 . The vacuum cleaner as claimed in  claim 5 , wherein the average cross-section gradually increases along a direction of air flow.  
   
   
       7 . The vacuum cleaner as claimed in  claim 5 , wherein the at least one inner casing comprises: 
 a first inner casing having a first air passing hole through which air is drawn into the motor; and    a second inner casing having a second air passing hole through which air is discharged to the diffusion passage.    
   
   
       8 . The vacuum cleaner as claimed in  claim 7 , wherein a third air passing hole is formed in the at least one outer casing opposite to the second air passing hole, and air is discharged from the diffusion passage through the third passing hole.  
   
   
       9 . The vacuum cleaner as claimed in  claim 8 , wherein the air discharge pipe is disposed adjacent to the third air passing hole.  
   
   
       10 . A motor assembly, comprising: 
 at least one motor;    at least one first casing configured to enclose at least a part of the at least one motor;    at least one second casing configured to enclose at least a part of the at least one first casing; and    means for diffusing air.    
   
   
       11 . The motor assembly as claimed in  claim 10 , wherein the at least one first casing includes means for drawing air into the at least one motor.  
   
   
       12 . The motor assembly as claimed in  claim 11 , wherein the at least one first casing includes means for discharging air to the means for diffusing.  
   
   
       13 . The motor assembly as claimed in  claim 10 , wherein the at least one first casing includes means for discharging air to the means for diffusing.  
   
   
       14 . A vacuum cleaner, comprising: 
 a cleaner body;    at least one motor disposed of the cleaner body;    at least one first casing configured to enclose at least a part of the at least one motor;    at least one second casing configured to enclose at least a part of the at least one first casing; and    means for diffusing air.    
   
   
       15 . The vacuum cleaner as claimed in  claim 14 , wherein the at least one first casing includes means for drawing air into the at least one motor.  
   
   
       16 . The vacuum cleaner as claimed in  claim 15 , wherein the at least one first casing includes means for discharging air to the means for diffusing.  
   
   
       17 . The vacuum cleaner as claimed in  claim 14 , wherein the at least one first casing includes means for discharging air to the means for diffusing.