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

Description

TECHNICAL FIELD[0001]The present invention relates to a fluid machinery used by being incorporated into a Rankine cycle or the like, in particular, relates to a fluid machinery that is provided with an expander that generates power by expansion of a refrigerant, and a piston pump that pumps the refrigerant.BACKGROUND ART[0002]As a fluid machinery incorporated into a Rankine cycle, a pump-integrated expander in which an expander that generates power by expansion of a refrigerant is integrally connected to a pump that pumps the refrigerant has been known (for example, see Patent Document 1). Inventors have considered adopting a piston pump, with high volumetric efficiency from a low rotational speed area to a high rotational speed area, as a pump of the fluid machinery of this type. In this case, a liquid-phase refrigerant drawn into the piston pump might flow into a crank chamber, and thus, there may be a concern over degradation of a lubrication state of each sliding section in the ...

AI Technical Summary

Benefits of technology

The patent is about a fluid machinery system that reduces the amount of liquid-phase refrigerant in the crank chamber, which prevents the refrigerant from gasifying and potentially decreasing the efficiency of the piston pump or causing a lubrication problem. The system achieves this by allowing the refrigerant outlet section to communicate with the crank chamber. This reduces the risk of gasification and maintains the piston pump's performance.

Problems solved by technology

In this case, a liquid-phase refrigerant drawn into the piston pump might flow into a crank chamber, and thus, there may be a concern over degradation of a lubrication state of each sliding section in the crank chamber.

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