Rotary compressor and method for manufacturing a rotary compressor

Abstract

A rotary compressor and a method for manufacturing a rotary compressor are provided. The rotary compressor may include a first case in which a stator may be provided, and a second case provided at one side of the first case and to which a compression mechanism may be coupled. The second case may include a first extension to which the compression mechanism may be welded, a step that extends to be stepped from the first extension, and a second extension that extends from the step. The second extension may be welded to the first case.

What is claimed is: 
     
         1 . A rotary compressor, comprising:
 a first case in which a stator is provided; and   a second case provided at one side of the first case and to which a compression mechanism is coupled, wherein the second case includes:
 a first extension to which the compression mechanism is coupled; 
 a step that extends to be stepped from the first extension; and 
 a second extension that extends from the step, wherein the second extension is coupled to the first case. 
   
     
     
         2 . The rotary compressor according to  claim 1 , wherein the step and an end of the first case are spaced apart from each other. 
     
     
         3 . The rotary compressor according to  claim 2 , wherein the second case is coupled to a lower side of the first case, and wherein a top surface of the step and a lower end of the first case are spaced apart from each other. 
     
     
         4 . The rotary compressor according to  claim 1 , further including a lower cover integrated with the second case to define an outer appearance of a lower portion of the second case. 
     
     
         5 . The rotary compressor according to  claim 1 , wherein the step extends from the first extension in a direction in which an inner diameter of the second case increases. 
     
     
         6 . The rotary compressor according to  claim 5 , wherein the compression mechanism includes a cylinder in which a roller is accommodated, and wherein the cylinder has an outer diameter less than an outer diameter of the stator. 
     
     
         7 . The rotary compressor according to  claim 5 , wherein the compression mechanism includes a cylinder in which a roller is accommodated, and wherein the cylinder has a same outer diameter as the stator. 
     
     
         8 . The rotary compressor according to  claim 1 , wherein the step extends from the first extension in a direction in which an inner diameter of the second case decreases. 
     
     
         9 . The rotary compressor according to  claim 8 , wherein the compression mechanism includes a cylinder in which a roller is accommodated, and wherein the cylinder has an outer diameter greater than an outer diameter of the stator. 
     
     
         10 . The rotary compressor according to  claim 8 , wherein the first extension is welded to the compression mechanism, and wherein the second extension is welded to the first case. 
     
     
         11 . The rotary compressor according to  claim 10 , further including a first welding provided between an outer circumferential surface of the first case and an inner circumferential surface of the second extension. 
     
     
         12 . The rotary compressor according to  claim 10 , further including a second welding provided on the first extension and coupled to the compression mechanism. 
     
     
         13 . The rotary compressor according to  claim 1 , further including a hook protrusion that protrudes inward from the first extension to support the compression mechanism. 
     
     
         14 . The rotary compressor according to  claim 4 , further including an upper cover coupled to the first case to define an outer appearance of an upper portion of the first case. 
     
     
         15 . A method for manufacturing a rotary compressor, the method comprising:
 installing a stator in a first case;   installing a compression mechanism including a rotor in a second case;   coupling a suction pipe to the second case;   attaching the compression mechanism to the second case;   assembling the first case with the second case to adjust an air gap between the stator and the rotor; and   attaching the first and second cases to each other.   
     
     
         16 . The method according to  claim 15 , wherein the second case includes a step which is bent to extend radially, and wherein the assembling of the first and second cases includes locating an end of the first case at a position which is spaced apart from the step. 
     
     
         17 . The method according to  claim 15 , wherein the installing of the compression mechanism in the second case includes supporting the compression mechanism on a hook protrusion of the second case. 
     
     
         18 . The method according to  claim 15 , wherein a lower cover that defines an outer appearance of a lower portion of the second case is integrated with the second case. 
     
     
         19 . The method according to  claim 15 , further including coupling an upper cover to the first case. 
     
     
         20 . The method according to  claim 15 , wherein the attaching the compression mechanism to the second case includes welding the compression mechanism to the second case. 
     
     
         21 . The method according to  claim 15 , wherein the attaching the first and second cases to each other includes welding the first and second cases to each other. 
     
     
         22 . A rotary compressor manufactured according to the method of  claim 15 .