Fluid Machinery

Abstract

A fluid machinery including: an expander that generates power by expansion of refrigerant; and a piston pump that pumps the refrigerant, and capable of reducing a decrease in lubrication performance of a mechanical sliding section in a crank chamber of the piston pump. A fluid machinery 29 A includes an expander unit (scroll expander) 60 A that generates power by expansion of refrigerant, and a pump unit (piston pump) 50 A that pumps the refrigerant. A rotating shaft 28 of the fluid machinery 29 A functions as an output shaft of the expander unit 60 A and a drive shaft of the pump unit 50 A. The rotating shaft 28 has a crank section 28 a housed in the crank chamber 72 A. A refrigerant outlet chamber 78 A, through which the expanded refrigerant is discharged from the expander unit 60 A, communicates with the crank chamber 72 A via a bearing 71 b , a housing space of a driven crank mechanism 80 , and an anti-rotation member 77.

1 . A fluid machinery comprising:
 an expander that generates power by expansion of a refrigerant; and   a piston pump that pumps the refrigerant,   wherein a refrigerant outlet chamber through which the refrigerant after expansion is discharged from the expander communicates with a crank chamber of the piston pump.   
     
     
         2 . The fluid machinery according to  claim 1 ,
 wherein the refrigerant outlet chamber and the crank chamber communicate with each other within a housing that houses the expander and the piston pump.   
     
     
         3 . The fluid machinery according to  claim 2 ,
 wherein the refrigerant after expansion, which has been discharged to the refrigerant outlet chamber from the expander, is discharged to the outside of the housing through the crank chamber.   
     
     
         4 . The fluid machinery according to  claim 2 ,
 wherein the refrigerant outlet chamber and the crank chamber communicate with each other via a bearing section that rotatably supports a rotating shaft having a function as an output shaft of the expander and a function as a drive shaft of the piston pump.   
     
     
         5 . The fluid machinery according to  claim 4 ,
 wherein the expander is a scroll expander,   the refrigerant outlet chamber and the crank chamber communicate with each other via the bearing section and an anti-rotation member that prevents rotation of an orbiting scroll in the scroll expander.   
     
     
         6 . The fluid machinery according to  claim 1 ,
 wherein a communication passage through which the refrigerant outlet chamber and the crank chamber communicate with each other is provided.   
     
     
         7 . The fluid machinery according to  claim 1 ,
 wherein a generator motor is provided between the expander and the piston pump.   
     
     
         8 . The fluid machinery according to  claim 7 ,
 wherein the refrigerant outlet chamber and the crank chamber communicate with each other via the generator motor.