Apparatus for controlling quantity of feeding oil of inverter compressor

Abstract

An oil feed controller of an inverter compressor controls the quantity of feeding oil to prevent excess oil from being fed to a compression part when rotational speed of a rotation shaft is increased. The oil feed controller includes an installation hole formed in the rotation shaft to communicate with an oil passage of the rotation shaft, a bypass formed in the rotation shaft to communicate with the leading end of the installation hole, and an oil feeding controlling part installed in the installation hole to close the bypass when the rotation shaft rotates at low speed and to open the bypass when the rotation shaft rotates at high speed such that the quantity of oil ascending to the compression part through the oil passage is controlled.

1 . An oil feed controller of an inverter compressor comprising: 
 a rotation shaft rotated by an inverter driving part and having an oil passage formed in the axial direction;    an oil feed pump installed at the lower side of the rotation shaft to feed oil reserved in a shell to a compression part through the oil passage; and    an oil feed controlling part installed in the rotation shaft to communicate with the oil passage and controlling the quantity of oil ascending to the compression part through the oil passage according to rotational speed of the rotation shaft.    
   
   
       2 . The oil feed controller of an inverter compressor as set forth in  claim 1 , wherein the oil feed controlling part has an installation hole formed in the rotation shaft to communicate with the oil passage, and a bypass formed in the rotation shaft to communicate with a leading end of the installation shaft.  
   
   
       3 . The oil feed controller of an inverter compressor as set forth in  claim 2 , further comprising: 
 a weight stopper formed between the leading end of the installation hole and the oil passage;    a weight contacting a wall of the weight stopper and installed in the installation hole to slide outward of the installation hole due to centrifugal force of the rotation shaft; and    an elastic pressing part installed in the installation hole to elastically press the weight.    
   
   
       4 . The oil feed controller of an inverter compressor as set forth in claims  3 , wherein the elastic pressing part comprises: 
 a spring installed in the installation hole to contact a surface of the weight; and    a fixing member attached to the outer circumference of the rotation shaft to fix the spring and to close a rear end of the installation hole.    
   
   
       5 . The oil feed controller of an inverter compressor as set forth in  claim 2 , wherein the bypass is upwardly inclined from the leading end of the installation hole to the outer circumference of the rotation shaft.  
   
   
       6 . The oil feed controller of an inverter compressor as set forth in  claim 2 , wherein the installation hole is horizontally formed to be perpendicular to the oil passage.  
   
   
       7 . The oil feed controller of an inverter compressor as set forth in  claim 3 , wherein the weight stopper is formed by a leading wall of the installation hole corresponding to a surface of the weight to closely contact the surface of the weight and has an oil introducing passage to communicate the oil passage with the installation hole.  
   
   
       8 . The oil feed controller of an inverter compressor as set forth in  claim 3 , wherein a width of the weight is wider than a width of a lower opening of the bypass communicated with the installation hole such that oil is prevented from entering a space between the elastic pressing part and the weight.  
   
   
       9 . The oil feed controller of an inverter compressor as set forth in  claim 7 , wherein an upper inclined groove is formed in the upper side of the oil introducing passage of the weight stopper toward the lower end of the bypass and a lower inclined groove is formed in the lower side of the oil introducing passage of the weight stopper toward the lower end of the bypass such that oil smoothly flows from the oil passage to the bypass.  
   
   
       10 . The oil feed controller of an inverter compressor as set forth in  claim 9 , wherein the weight further includes an inclined surface formed in the upper side of the weight at an angle to face the lower end of the bypass such that oil smoothly flow from the oil passage to the bypass.  
   
   
       11 . An oil feed controller of an inverter compressor comprising: 
 a rotation shaft rotated by an inverter driving part and having an oil passage formed in the axial direction;    an oil feed pump installed at the lower side of the rotation shaft to feed oil reserved in a shell to a compression part through the oil passage;    an installation groove formed in the lower end of the rotation shaft and having an upper side to communicate with the oil passage;    an insertion member inserted into and fixed in the installation groove and having an oil feeding passage formed in the axial direction and communicating with the oil passage; and    an oil feed controlling part installed in the oil feeding passage, formed in the upper side of the insertion member to communicate with the oil passage, and controlling the quantity of oil ascending to the compression part through the oil passage by reducing the cross section of the oil passage as rotational speed of the rotation shaft is increased.    
   
   
       12 . The oil feed controller of an inverter compressor as set forth in  claim 11 , wherein the oil feed controlling part comprises: 
 a sliding groove formed in the upper side of the insertion member to communicate with the oil passage;    an eccentric weight inserted into the sliding groove to slide along the sliding groove;    an elastic member installed between a surface of the eccentric weight and a wall of the sliding groove and elastically supporting the eccentric weight to closely contact the other wall of the sliding groove.    
   
   
       13 . The oil feed controller of an inverter compressor as set forth in  claim 12 , wherein the eccentric weight is shifted from the center of the rotation shaft to the elastic member due to elastic force of the elastic member.  
   
   
       14 . The oil feed controller of an inverter compressor as set forth in  claim 12 , wherein the elastic member comprises a spring having one end connected to the surface of the eccentric weight and the other end connected to the wall of the sliding groove.  
   
   
       15 . The oil feed controller of an inverter compressor as set forth in  claim 12 , further comprising a bypass formed in a wall of the sliding groove, which the surface of the eccentric weight closely contacts, and penetrating the rotation shaft.  
   
   
       16 . The oil feed controller of an inverter compressor as set forth in  claim 12 , wherein the sliding groove is horizontally formed to be perpendicular to the oil passage.  
   
   
       17 . The oil feed controller of an inverter compressor as set forth in  claim 12 , further comprising a guide for supporting the eccentric weight to be located between the wall of the sliding groove and the surface of the eccentric weight and for guiding the eccentric weight to horizontally move.  
   
   
       18 . The oil feed controller of an inverter compressor as set forth in  claim 17 , wherein the guide comprises: 
 a guide hole horizontally penetrating the eccentric weight; and    a guide rod inserted into the guide hole to slide and horizontally installed in a wall of the sliding groove.