Exhaust pipe

Abstract

An exhaust pipe comprises a pipe body formed therein with a silence chamber and an expansion chamber. A U-shaped gas inlet tube and a discharge tube are settled in the pipe body. The exhaust pipe facilitates smoothening waste gas discharge, generating appropriate exhaust back pressure and decreasing exhaust noise.

1 . An exhaust pipe, comprising:
 a closed pipe body, in which a partition defines at least one expansion chamber and at least one silence chamber that is filled with a sound absorbing material;   a U-shaped gas inlet tube, having a U-shaped body with a gas inlet and a gas outlet at two ends thereof, wherein the U-shaped body is fixed in and axially parallel to the closed tube, the gas inlet being opened to a pipe wall of the pipe body while the gas outlet is located in the expansion chamber, and the U-shaped body inside the silence chamber being wrapped by the sound absorbing material and formed with a plurality of noise elimination holes;   at least one discharge tube, having a tube body with a gas inlet and a gas outlet at two ends thereof, wherein the tube body is fixed in and axially parallel to the closed tube, a greater part of the tube body being located in the silence chamber and wrapped by the sound absorbing material, the gas inlet being located in the expansion chamber while the gas outlet is opened to the pipe wall of the pipe body, and the part of the tube body inside the silence chamber being formed with a plurality of noise elimination holes.   
   
   
       2 . The exhaust pipe of  claim 1 , wherein, the silence chamber has a capacity greater than a capacity of the expansion chamber. 
   
   
       3 . The exhaust pipe of  claim 1 , wherein, the partition is formed with a plurality of vents for gaseous convection. 
   
   
       4 . The exhaust pipe of  claim 1 , wherein, the gas inlet of the U-shaped gas inlet tube is opened to the pipe wall of a first end of the pipe body. 
   
   
       5 . The exhaust pipe of  claim 4 , wherein, the tube body of the discharge tube is in a U shape. 
   
   
       6 . The exhaust pipe of  claim 5 , wherein, the gas outlet of the discharge tube is opened to the pipe wall of the first end of the pipe body. 
   
   
       7 . The exhaust pipe of  claim 4 , wherein, the tube body of the discharge tube is in a straight shape. 
   
   
       8 . The exhaust pipe of  claim 7 , wherein, the gas inlet of the discharge tube is located in the expansion chamber and two ends of the tube body is formed with a respective gas outlet in which the gas outlets are opened to the pipe wall of the first end and a pipe wall of a second end of the pipe body, respectively. 
   
   
       9 . The exhaust pipe of  claim 7 , wherein, another partition in the pipe body defines another silence chamber that is also filled with a sound absorbing material, in which the expansion chamber is sandwiched between the two silence chambers. 
   
   
       10 . The exhaust pipe of  claim 9 , wherein, the partition is formed with a plurality of vents for gaseous convection. 
   
   
       11 . The exhaust pipe of  claim 10 , wherein, the gas inlet of the U-shaped air inlet tube is opened to a lateral wall of the pipe body.