Lubrication structure in a scroll type compressor

Abstract

The oil passage for lubricating a seal means, which separates a high discharge pressure area inside a compressor and a low pressure area inside the compressor with a surface of a rotating member, can be eliminated. A lip seal 37 , which is interposed between a center housing 12 and a circumferential surface of a rotating shaft 14 , is prevented from being withdrawn from an insertion hole 121 by a circlip 38 . A support portion 122 , which forms a part of the insertion hole 121 and supports the lip seal 37 , extends out into a motor housing 13 . An outlet port 324 of a discharge passage 32 is directed to the top portion of the support portion 122 and the circlip 38.

1 . A lubrication structure in a scroll type compressor, wherein: 
 a fixed scroll, on the base of which a fixed scroll wall is formed, is opposed to a mobile scroll, on the base of which a mobile scroll wall is formed;    a hermetic space, the volume of which decreases according to the periodical revolution of the mobile scroll, is formed between the mobile scroll wall at the mobile scroll side that periodically revolves without self-rotation and the fixed scroll wall; and    the mobile scroll is designed so as to periodically revolve when a rotational force of a rotating shaft is transmitted to a periodical revolution mechanism in order to periodically revolve the mobile scroll;    comprising a seal means which separates the discharge pressure area inside the compressor and other pressure area inside the compressor with the surface of a rotating member; and    a discharge passage provided inside the rotating member;    wherein the outlet port of the discharge passage is directed to at least one of the support portion supporting the seal means and the seal means.    
     
     
         2 . A lubrication structure in a scroll type compressor as set forth in    claim 1   , wherein the rotating member is a rotating shaft and the seal means is a lip seal.  
     
     
         3 . A lubrication structure in a scroll type compressor as set forth in    claim 2   , wherein the outlet port of the discharge passage is open to the circumferential surface of the rotating shaft.  
     
     
         4 . A lubrication structure in a scroll type compressor as set forth in    claim 2   , wherein the periodical revolution mechanism comprises an eccentric shaft integrally rotating with the rotating shaft and a transmission means of an eccentric rotation, which is interposed between the eccentric shaft and the mobile scroll and transmits the eccentric rotation of the eccentric shaft to the mobile scroll, and 
 wherein the discharge passage continues in and penetrates through the eccentric shaft and the rotation shaft.    
     
     
         5 . A lubrication structure in a scroll type compressor as set forth in    claim 1    of the present invention, wherein a discharge port is provided on the mobile scroll base and the back pressure chamber is provided on the back side of the mobile scroll base and the discharge port is open to the back pressure chamber and the inlet port of the discharge passage is open to the back pressure chamber.