Scroll device for compression or expansion

Abstract

A device for varying pressure of a fluid comprising a scroll case ( 11 ) containing a fixed scroll ( 12 ) and a mobile scroll ( 13 ) relatively to the case, and with admission (A) and outlet (B) ports for the fluid, characterized in that it comprises means for thermally insulating the scrolls.

1 . A device for varying pressure of a fluid, comprising a scroll case containing a fixed scroll and a mobile scroll relatively to the case, and with admission and outlet ports for the fluid, an orbiting bearing and means for thermally insulating the scrolls, wherein these thermally insulating means include the fixed scroll being separated from the scroll case and a tolerance ring, consisting of a bushing with a flexible radial thickness, being placed between a housing of the mobile scroll and the outer diameter of the orbiting bearing. 
     
     
         2 . The pressure variation device according to  claim 1 , wherein the thermal insulation means are provided by a space between the fixed scroll and the corresponding scroll case. 
     
     
         3 . The pressure variation device according to  claim 1 , wherein the thermal insulation means are also provided between the mobile scroll and the orbiting bearing. 
     
     
         4 . The pressure variation device according to  claim 1 , wherein the thermal insulation means comprise a separation disk placed at the bottom of the orbiting bearing which separates the mobile scroll from the rotating bearing by an insulation space. 
     
     
         5 . The pressure variation device according to  claim 1 , wherein the thermal insulating means comprise an insulating material placed between the orbiting bearing and the mobile scroll. 
     
     
         6 . The pressure variation device according to  claim 1 , wherein means for preventing thermal deformations of the scrolls are provided. 
     
     
         7 . The pressure variation device according to  claim 6 , wherein the means for preventing thermal deformations are formed by an expansion ring introducing a local force which deforms the mobile scroll in the direction opposite to its normal deformation direction. 
     
     
         8 . A scroll device including two coupled stages on a rotary shaft, at both ends of an intermediate electric power device, wherein the first stage is formed by a first pressure variation device according to  claim 1 , and wherein the second stage is formed by a second pressure variation device with second admission and outlet ports respectively decoupled from the admission and outlet ports of the first pressure variation device. 
     
     
         9 . The scroll device according to  claim 8 , wherein the first stage is attached in a scroll case and a transmission system is attached in a transmission case, and wherein thermal insulation means are provided between the stage and the transmission system, in the form of an insulation plate placed between the scroll case and the transmission case. 
     
     
         10 . The scroll device according to  claim 8 , wherein the second stage is connected in a series configuration to the first stage so that one of the two stages operates at a higher pressure than the other. 
     
     
         11 . The scroll device according to  claim 8 , wherein the second stage is connected in a parallel configuration to the first stage, so that both pressure variation devices are independent from each other. 
     
     
         12 . The scroll device according to  claim 8 , wherein the intermediate electric power device comprises a rotor and a stator, and wherein a hermetic sleeve is provided between the rotor and the stator. 
     
     
         13 . (canceled) 
     
     
         14 . The use of an apparatus according to  claim 8 , in an hybrid motor vehicle for producing electricity by recovering heat from waste exhaust gas of the engine of the vehicle. 
     
     
         15 . The use of an apparatus according to  claim 8 , for combined production of electricity and heat.