Rotary compressor

Abstract

A rotary compressor ( 100 ) includes a casing ( 1 ), an electric motor ( 2 ) and a compression mechanism ( 3 ), in which the electric motor ( 2 ) includes a stator core ( 21 ) and a rotor core ( 22 ), the compression mechanism ( 3 ) includes an air cylinder assembly ( 31 ) and a main bearing ( 32 ) connected to a side end face of the cylinder assembly ( 31 ) adjacent to the electric motor ( 2 ), the largest distance between a side end face of the stator core ( 21 ) adjacent to the first end wall ( 111 ) and the first end wall ( 111 ) is denoted by Dst, the smallest distance between a side end face of the rotor core ( 22 ) adjacent to the first end wall ( 111 ) and a side end face of a flange portion ( 321 ) of the main bearing ( 32 ) at one side adjacent to the first end wall ( 111 ) is denoted by Drt, in which Dst and Drt satisfy a relationship: 0.335≤Dst/Drt≤0.838.

1 . A rotary compressor comprising:
 a casing, two ends of the casing in an axial direction having a first end wall and a second end wall respectively;   an electric motor disposed in the casing and comprising a stator core and a rotor core, wherein in the axial direction of the casing, the largest distance between a side end face of the stator core adjacent to the first end wall and the first end wall is denoted by Dst;   a compression mechanism disposed in the casing and located at one side of the electric motor far away from the first end wall, the compression mechanism comprising an air cylinder assembly and a main bearing, the main bearing being connected to a side end face of the cylinder assembly adjacent to the electric motor, wherein in the axial direction of the casing, the smallest distance between a side end face of the rotor core adjacent to the first end wall and a side end face of a flange portion of the main bearing adjacent to the first end wall is denoted by Drt;   wherein, Dst and Drt satisfy a relationship: 0.335≤Dst/Drt≤0.838.   
     
     
         2 . The rotary compressor according to  claim 1 , wherein Dst and Drt further satisfy a relationship: 0.568≤Dst/Drt≤0.680. 
     
     
         3 . The rotary compressor according to  claim 1 , wherein an air hole is formed on and throughout the rotor core and a central axis of the air hole is parallel to a rotation axis of the rotor core. 
     
     
         4 . The rotary compressor according to  claim 3 , wherein the air holes are axisymmetrically distributed about a first diameter of the rotor core and a width D of the air hole in a first diameter direction satisfies a relationship: 0.204 mm≤D≤0.480 mm. 
     
     
         5 . The rotary compressor according to  claim 4 , wherein D further satisfies a relationship: 0.404 mm≤D≤0.460 mm. 
     
     
         6 . The rotary compressor according to  claim 3 , wherein a contour of a cross section of the air hole is a curve or a combination of a curve and a straight line. 
     
     
         7 . The rotary compressor according to  claim 3 , wherein in a rotation axis direction of the rotor core, the cross section of the air hole has the same shape and dimension. 
     
     
         8 . The rotary compressor according to  claim 3 , wherein a plurality of air holes are provided and evenly spaced apart from one another along a circumferential direction of the rotor core. 
     
     
         9 . The rotary compressor according to  claim 8 , wherein each air hole has the same shape and dimension. 
     
     
         10 . The rotary compressor according to  claim 1 , wherein the rotor core is rotatably disposed inside the stator core. 
     
     
         11 . The rotary compressor according to  claim 4 , wherein a contour of a cross section of the air hole is a curve or a combination of a curve and a straight line. 
     
     
         12 . The rotary compressor according to  claim 5 , wherein a contour of a cross section of the air hole is a curve or a combination of a curve and a straight line. 
     
     
         13 . The rotary compressor according to  claim 4 , wherein in a rotation axis direction of the rotor core, the cross section of the air hole has the same shape and dimension. 
     
     
         14 . The rotary compressor according to  claim 5 , wherein in a rotation axis direction of the rotor core, the cross section of the air hole has the same shape and dimension. 
     
     
         15 . The rotary compressor according to  claim 6 , wherein in a rotation axis direction of the rotor core, the cross section of the air hole has the same shape and dimension. 
     
     
         16 . The rotary compressor according to  claim 4 , wherein a plurality of air holes are provided and evenly spaced apart from one another along a circumferential direction of the rotor core. 
     
     
         17 . The rotary compressor according to  claim 5 , wherein a plurality of air holes are provided and evenly spaced apart from one another along a circumferential direction of the rotor core. 
     
     
         18 . The rotary compressor according to  claim 6 , wherein a plurality of air holes are provided and evenly spaced apart from one another along a circumferential direction of the rotor core. 
     
     
         19 . The rotary compressor according to  claim 7 , wherein a plurality of air holes are provided and evenly spaced apart from one another along a circumferential direction of the rotor core. 
     
     
         20 . The rotary compressor according to  claim 2 , wherein the rotor core is rotatably disposed inside the stator core.