Refrigerant compressor and heat pump apparatus

摘要

A device that enhances compressor efficiency by reducing pressure losses in a discharge muffler space into which is discharged a refrigerant compressed by a compression unit. A low-stage discharge muffler space is formed in the shape of a ring around a drive shaft. In the low-stage discharge muffler space, a communication port flow guide is provided so as to cover a predetermined area of an opening of a communication port from a side of a flow path in a reverse direction out of two flow paths in different directions around the drive shaft from a discharge port through which is discharged the refrigerant compressed by a low-stage compression unit to the communication port through which the refrigerant flows out. The communication port flow guide transforms a direction of a flow into a direction of a connecting flow path.

主权项

1. A refrigerant compressor configured by stacking a plurality of compression units and an intermediate partition plate in a direction of a drive shaft, the plurality of compression units being driven by rotation of the drive shaft passing through a center portion, each of the plurality of compression units drawing a refrigerant into a cylinder chamber and compressing the refrigerant in the cylinder chamber, and the intermediate partition plate being positioned between the cylinder chamber of one of the plurality of compression units and the cylinder chamber of another one of the plurality of compression units, the refrigerant compressor comprising:
a discharge muffler that defines, as a ring-shaped space around the drive shaft, a discharge muffler space including a discharge port through which the refrigerant compressed at a predetermined compression unit of the plurality of compression units is discharged from the cylinder chamber of that compression unit, and a communication port through which the refrigerant discharged through the discharge port flows out to a different space; a connecting flow path that passes through the intermediate partition plate in the direction of the drive shaft, and guides the refrigerant from the discharge muffler space through the communication port to the different space; a communication port flow guide that is formed to protrude into the ring-shaped space to cover a predetermined area of an opening portion of the communication port in the discharge muffler space; and a discharge port rear guide that is positioned closer to the discharge port than to the communication port in a flow path in a reverse direction out of two flow paths from the discharge port to the communication port in different directions around the drive shaft in the ring-shaped discharge muffler space, the discharge port rear guide preventing the refrigerant discharged through the discharge port from flowing in the reverse direction, wherein the discharge port rear guide prevents the refrigerant from flowing in the reverse direction, thereby causing the refrigerant to circulate in a forward direction in the ring-shaped discharge muffler space, and wherein the communication port flow guide and the discharge port rear guide are configured such that a pressure loss caused by the communication port flow guide and the discharge port rear guide in a circulation flow of the refrigerant around the drive shaft in the ring-shaped discharge muffler space is smaller when the refrigerant circulates in the forward direction than in the reverse direction.