Oil discharge reducing device for scroll compressor

Abstract

An oil discharge reducing device for a scroll compressor comprises: a refrigerant guiding mechanism for guiding a refrigerant gas of high pressure discharged through a discharge opening of the fixed scroll to a rotor of the driving motor; and an oil separating mechanism penetrated through the rotor and for separating oil contained in the refrigerant gas by a centrifugal force caused by the rotation of the rotor while the refrigerant gas guided by the refrigerant guiding mechanism cools the driving motor as it flows though the driving motor. According to this, an amount of oil leaked to outside of the compressor is minimized, and the driving motor constituting the compressor can be effectively cooled.

1 . An oil discharge reducing device for a scroll compressor, the scroll compressor comprising: a casing filled with oil at the bottom face thereof; a driving motor mounted to the casing and for generating a rotary force; a main frame fixed and coupled to the casing; a fixed scroll located at a predetermined interval from the main frame; and a orbiting scroll positioned between the fixed scroll and the main frame, and interlocked with the fixed scroll, 
 wherein the oil discharge device comprises:    a refrigerant guiding mechanism for guiding a refrigerant gas of high pressure discharged through a discharge opening of the fixed scroll to a rotor of the driving motor; and    an oil separating mechanism penetrated through the rotor and for separating oil contained in the refrigerant gas by a centrifugal force caused by the rotation of the rotor while the refrigerant gas guided by the refrigerant guiding mechanism cools the driving motor as it flows though the driving motor.    
   
   
       2 . The device of  claim 1 , wherein the refrigerant guiding mechanism comprises a first flow pathway formed at one side of the fixed scroll and a second flow pathway penetrated through the main frame so that the refrigerant having passed through the first flow pathway faces the upper side of the rotor.  
   
   
       3 . The device of  claim 1 , wherein the second flow pathway comprises a first vertical hole vertically formed on the outer circumferential surface of the main frame so as to be communicated with the first pathway, a horizontal hole horizontally formed extended from the first vertical hole and a second vertical hole vertically formed extended from the horizontal hole.  
   
   
       4 . The device of  claim 2 , wherein a guide member for guiding the refrigerant gas flown out through the second flow pathway to the upper side of the rotor is located on the lower surface of the main frame and in the upper side of the rotor.  
   
   
       5 . The device of  claim 4 , wherein the guide member is formed in a cylindrical shape.  
   
   
       6 . The device of  claim 4 , wherein the guide member is formed integral with the main frame.  
   
   
       7 . The device of  claim 1 , wherein the oil separating mechanism is a through flow channel penetrated through the rotor in that is penetrated through the rotor in its lengthwise direction.  
   
   
       8 . The device of  claim 7 , wherein the rotor is composed of: a rotor body constructed as a cylindrical laminated body that a plurality of circular thin plates are laminated, having a plurality of slots penetrated as a circular arc shape along a circumferential direction of the laminated body, and having a shaft insertion hole at a center of the laminated body; and an upper end ring and a lower end ring coupled to both sides of the rotor body, and the through flow channel is composed of: a plurality of first holes penetrated through the upper end ring and communicated with the slots; and a plurality of second holes penetrated through the lower end ring and communicated with the slots.  
   
   
       9 . The device of  claim 8 , wherein the rotor is formed poles by the plurality of slots when the driving motor is operated.  
   
   
       10 . The device of  claim 8 , wherein the first holes are positioned at the center of the slots.  
   
   
       11 . The device of  claim 8 , wherein the second holes are consist of gas discharge holes located at the center of the slots and oil discharge holes located at both ends of the slots, respectively.  
   
   
       12 . The device of  claim 11 , wherein the gas discharge holes and the first holes are positioned on the same line, respectively.  
   
   
       13 . The device of  claim 11 , wherein an oil separating plate is formed on the lower surface of the lower end ring which is partitioned off into the gas discharge holes and the oil discharge holes for preventing gas and oil from being mixed.  
   
   
       14 . The device of  claim 13 , wherein the oil separating plate is formed in a cylindrical shape having a predetermined length.  
   
   
       15 . The device of  claim 7 , wherein the through flow channel consists of a plurality of oil separating grooves penetrated in the lengthwise direction of the rotor on the inner circumferential surface of the shaft insertion hole of the rotor into which the rotary shaft is pressingly fit.  
   
   
       16 . The device of  claim 15 , wherein the sections of the oil separating grooves are formed in a constant manner.  
   
   
       17 . The device of  claim 15 , wherein the oil separating grooves are formed in a manner that the sectional area gradually increases so that the outlet side is larger than the inlet side.