Vacuum pump exhaust pipe muffler and refrigerator having same

Abstract

A muffler comprising a hollow cavity enclosed by a first bottom surface, a second bottom surface and a side wall, the side wall connects the first bottom surface with the second bottom surface, an air inlet at one end of the hollow cavity and an air outlet at the other end of the hollow cavity; the cavity is divided into a plurality of chambers in an axial direction, the chambers comprise a first chamber adjacent to the first bottom surface, a second chamber adjacent to the second bottom surface and an intermediate chamber located between the first chamber and the second chamber, the air inlet is in gas communication with the intermediate chamber, and the air outlet is in gas communication with the first chamber.

What is claimed is: 
     
         1 . A muffler comprising:
 a hollow cavity enclosed by a first bottom surface, a second bottom surface and a side wall, the side wall connects the first bottom surface with the second bottom surface;   an air inlet at one end of the muffler and an air outlet at the other end of the muffler;   the cavity is divided into a plurality of chambers in an axial direction, the chambers comprise a first chamber adjacent to the first bottom surface, a second chamber adjacent to the second bottom surface and an intermediate chamber located between the first chamber and the second chamber, the air inlet is in gas communication with the intermediate chamber, the intermediate chamber is in gas communication with the second chamber, the first chamber is in gas communication with the second chamber, and the air outlet is in gas communication with the first chamber.   
     
     
         2 . The muffler according to  claim 1 , wherein at least part of the chambers has different volumes. 
     
     
         3 . The muffler according to  claim 1 , wherein further comprises a first duct, a second duct, a third duct and a fourth duct, the first duct is communicated with the air inlet and the intermediate chamber, the second duct is communicated with the intermediate chamber and the second cavity, the third duct is communicated with the first chamber and the second chamber, and the fourth duct is communicated with the first chamber and the air outlet. 
     
     
         4 . The muffler according to  claim 3 , wherein the first duct, the second duct, the third duct and the fourth duct are arranged in turn in an air path direction. 
     
     
         5 . The muffler according to  claim 1 , wherein there is at least one the intermediate chamber. 
     
     
         6 . A muffler comprising a housing, wherein the housing is enclosed to form a hollow cavity, an air inlet is arranged at a proximal end of the housing, an air outlet is arranged at a distal end of the housing, the cavity is divided into a plurality of chambers from the proximal end to the distal end, the chambers comprise a first chamber positioned relatively adjacent to the proximal end, a second chamber positioned relatively adjacent to the distal end and an intermediate chamber located between the first chamber and the second chamber, the air inlet is in gas communication with the intermediate chamber, the intermediate chamber is in gas communication with the second chamber, the first chamber is in gas communication with the second chamber, and the air outlet is in gas communication with the first chamber. 
     
     
         7 . The muffler according to  claim 6 , wherein at least part of the chambers has different volumes. 
     
     
         8 . The muffler according to  claim 6 , wherein further comprising a first duct, a second duct, a third duct and a fourth duct, the first duct is communicated with the air inlet and the intermediate chamber, the second duct is communicated with the intermediate chamber and the second cavity, the third duct is communicated with the first chamber and the second chamber, and the fourth duct is communicated with the first chamber and the air outlet. 
     
     
         9 . The muffler according to  claim 3 , wherein the first duct, the second duct, the third duct and the fourth duct are arranged in turn in an air path direction. 
     
     
         10 . A refrigerator comprising a sealed box receiving a vacuum pump, wherein the refrigerator further comprises the muffler according to  claim 1 , and the vacuum pump is connected with the muffler.