Twin-type scroll fluid machine

Abstract

The present invention provides a twin-type scroll fluid machine that achieves downsizing and weight reduction. The twin scroll fluid machine 1 according to the present invention engages with a center support shaft 24 and a pair of swirling scrolls 31 and 41 provided at both ends of the center support shaft 24 as respective sweirling scrolls 31 and 41 . In the twin scroll fluid machine 1 that includes a pair of fixed scrolls 33 and 43 defining a pair of compression chambers 32 and 42 , the center support shaft 24 is eccentrically fixed and forms part of a motor section. A drive shaft 21 to which a rotor 22 is fixed; an inner housing 20 which rotatably fixes the drive shaft 21 and fixes a stator 22 that constitutes a part of a motor disposed opposite to the rotor 22 ; An Oldham mechanism 36 is provided between the inner housing 20 and the swirling scrolls 31 and 41.

1 . A twin-type scroll fluid machine comprising a central support shaft, a pair of swirling scrolls provided at both ends of the central support shaft, and a pair of fixed scrolls that engage with the respective swirling scrolls to form a pair of compression chambers, characterized by comprising: a drive shaft to which the central support shaft is eccentrically fixed and to which the rotor of the motor is fixed; an inner housing to which the drive shaft is rotatably fixed and to which the stator of the motor, which is arranged opposite the rotor, is fixed; and an oldham mechanism arranged between the inner housing and the swirling scroll. 
     
     
         2 . The twin-type scroll fluid machine according to  claim 1 , characterized in that:
 the inner housing is composed of a first and a second housing that are axially split, and the stator is sandwiched and secured by the first and the second housing.   
     
     
         3 . The twin-type scroll fluid machine according to  claim 1 , characterized in that the central support rod has a through hole connecting the compression chamber on one side thereof with the compression chamber on the other side thereof. 
     
     
         4 . The twin-type scroll fluid machine according to  claim 1 , characterized in that each swirling scroll is connected and fixed by a plurality of peripheral support rods located at predetermined intervals near the periphery of each swirling scroll, and that each connected swirling scroll is movable in the thrust direction thereof. 
     
     
         5 . The twin-type scroll fluid machine according to  claim 2 , characterized in that the central support rod has a through hole connecting the compression chamber on one side thereof with the compression chamber on the other side thereof. 
     
     
         6 . The twin-type scroll fluid machine according to  claim 2 , characterized in that each swirling scroll is connected and fixed by a plurality of peripheral support rods located at predetermined intervals near the periphery of each swirling scroll, and that each connected swirling scroll is movable in the thrust direction thereof. 
     
     
         7 . The twin-type scroll fluid machine according to  claim 5 , characterized in that each swirling scroll is connected and fixed by a plurality of peripheral support rods located at predetermined intervals near the periphery of each swirling scroll, and that each connected swirling scroll is movable in the thrust direction thereof.