Scroll fluid machine

Abstract

An orbiting scroll 1 having a warp and a pair of fixed scrolls 2, 3 having a wrap are combined; a hollow orbiting shaft 1 D is provided at the center part of the orbiting scroll 1; a rotating shaft 6 passes through the hollow portion 1 E of the orbiting shaft 1 D; a pair of covers 7, 9 is provided on the outer surface side of the fixed scroll 2, 3; the rotating shaft 6 is rotatably supported by covers 7, 9; orbiting bearings 12, 14 are provided on both ends of the orbiting shaft 1 D; the orbiting bearings 12, 14 fit eccentric portions 6 A, 6 B provided on the rotating shaft 6; and a self-rotation prevention mechanism for the orbiting scroll 1 is provided at one end of the orbiting shaft 1 D.

1 . A scroll fluid machine constituted of a combination of an orbiting scroll that has a spiral wrap on both surfaces of a paneling and a pair of fixed scrolls that has a spiral wrap on one surface of a paneling, wherein
 a hollow orbiting shaft is provided at the center part of said orbiting scroll to pass through said fixed scroll;   a rotating shaft passes through the hollow portion of said orbiting shaft such that it is rotatably supported by a pair of covers provided on the outer surface side of said fixed scroll;   orbiting bearings are provided on both ends of said orbiting shaft to fit an eccentric portion provided on said rotating shaft;   and a self-rotation prevention mechanism of said orbiting scroll is provided on one end of said orbiting shaft.   
     
     
         2 . The scroll fluid machine according to  claim 1  wherein
 said eccentric portion is provided only at the position of said rotating shaft corresponding to said orbiting bearing, 
 and the intermediate portion between the eccentric portions of said rotating shaft is formed coaxially with the rotation center axis. 
 
     
     
         3 . The scroll fluid machine according to  claim 1  wherein
 said self-rotation prevention mechanism is constituted of a pair of fixed-side key grooves provided coupled with said fixed scroll on one side; 
 a pair of orbiting-side key grooves provided so as to cross orthogonally to said fixed-side key grooves in an orbiting bearing housing which is provided on said orbiting shaft to accommodate said orbiting bearing; 
 and an Oldham's ring having a pair of Oldham's keys fitting said fixed-side key grooves and a pair of Oldham's keys fitting said orbiting-side key grooves. 
 
     
     
         4 . The scroll fluid machine according to  claim 2  wherein
 said self-rotation prevention mechanism is constituted of a pair of fixed-side key grooves provided coupled with said fixed scroll on one side; 
 a pair of orbiting-side key grooves provided so as to cross orthogonally to said fixed-side key grooves in an orbiting bearing housing which is provided on said orbiting shaft to accommodate said orbiting bearing; 
 and an Oldham's ring having a pair of Oldham's keys fitting said fixed-side key grooves and a pair of Oldham's keys fitting said orbiting-side key grooves. 
 
     
     
         5 . The scroll fluid machine according to  claim 1  wherein
 a 1st balance weight is attached to said rotating shaft between said orbiting bearing at one end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said one cover; 
 and a 2nd balance weight is attached to said rotating shaft between said orbiting bearing at the other end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said the other cover. 
 
     
     
         6 . The scroll fluid machine according to  claim 2  wherein
 a 1st balance weight is attached to said rotating shaft between said orbiting bearing at one end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said one cover; 
 and a 2nd balance weight is attached to said rotating shaft between said orbiting bearing at the other end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said the other cover. 
 
     
     
         7 . The scroll fluid machine according to  claim 3  wherein
 a 1st balance weight is attached to said rotating shaft between said orbiting bearing at one end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said one cover; 
 and a 2nd balance weight is attached to said rotating shaft between said orbiting bearing at the other end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said the other cover. 
 
     
     
         8 . The scroll fluid machine according to  claim 4  wherein
 a 1st balance weight is attached to said rotating shaft between said orbiting bearing at one end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said one cover; 
 and a 2nd balance weight is attached to said rotating shaft between said orbiting bearing at the other end of said orbiting shaft and the rotating shaft bearing rotatably supporting said rotating shaft at said the other cover.