Patent ID: 8790097

Claim:
A refrigerant compressor comprising: a compression unit that is driven by rotation of a drive shaft passing through a center portion, the compression unit including a low-stage compression unit having a low-stage cylinder chamber that draws in and compresses a refrigerant, a high-stage compression unit having a high-stage cylinder chamber that draws in and further compresses the refrigerant compressed by the low-stage compression unit, and an interconnecting portion that connects the low-stage cylinder chamber and the high-stage cylinder chamber, the compression unit compressing the refrigerant in two stages such that a change in volume of the low-stage cylinder chamber discharging the refrigerant and a change in volume of the high-stage cylinder chamber drawing in the refrigerant are phase-shifted and a pressure pulsation loss is generated in the interconnecting portion; a discharge muffler provided in the interconnecting portion and comprising a ring-shaped discharge muffler space surrounding the drive shaft, wherein the refrigerant compressed in the low-stage cylinder chamber flows into the ring-shaped discharge muffler space via a discharge port and circulates in a forward circumferential direction in the ring-shaped discharge muffler space to reach a communication port for the high-stage cylinder chamber; and a discharge port rear guide provided in the ring-shaped discharge muffler space and arranged to partially block a flow path circulation flow of the refrigerant to the communication port in a reverse circumferential direction that is circumferentially opposite a flow path in the forward circumferential direction, wherein the refrigerant is prevented from flowing in the reverse circumferential direction, so that the refrigerant circulates in the forward circumferential direction in the ring-shaped discharge muffler space and the pressure pulsation loss in the interconnecting portion is reduced.