BACKGROUND

Field of Invention

Embodiments disclosed herein relate to a scroll compressor.

Background Information

JP 2018-009537 A discloses a scroll compressor that is of a low-pressure shell type and has a symmetric wrap structure. This compressor includes two scrolls. The scrolls include spiral bodies (wraps) having symmetrical spiral shapes. When the compressor sucks in a gas refrigerant for compressing the gas refrigerant, part of the gas refrigerant flows into a first suction chamber defined by the two scrolls, through a first refrigerant guide port connected to a suction pipe, while the remaining gas refrigerant flows into a second suction chamber defined by the two scrolls, through a second refrigerant guide port connected to the suction pipe. The first refrigerant guide port and the second refrigerant guide port are disposed opposite each other with a rotation axis in between. The refrigerant guide ports are bored in a frame fixing a fixed scroll of the two scrolls to a hermetic container (a casing).

SUMMARY

A first aspect provides a scroll compressor having a symmetric wrap structure and being fully hermetic. The scroll compressor includes fixed and movable scrolls, a crank shaft configured to rotate about a rotation axis to drive the movable scroll, a motor configured to rotate the crank shaft, and a casing having an internal space defined to accommodate the fixed scroll, the movable scroll, the crank shaft, and the motor. The fixed scroll includes a fixed-side flat plate and a fixed-side wrap having a spiral shape and extending from a front face of the fixed-side flat plate. The movable scroll includes a movable-side flat plate and a movable-side wrap having a spiral shape and extending from a front face of the movable-side flat plate. The casing includes an oil reservoir configured to retain a refrigerating machine oil, the oil reservoir being located on a bottom of the internal space, and a motor space configured to accommodate the motor, the motor space serving as a low-pressure space into which a low-pressure gas refrigerant is sucked externally. The fixed scroll and the movable scroll define a first compression chamber surrounded by the front face of the fixed-side flat plate, the front face of the movable-side flat plate, an inner peripheral face of the fixed-side wrap, and an outer peripheral face of the movable-side wrap. The fixed scroll and the movable scroll define a second compression chamber surrounded by the front face of the fixed-side flat plate, the front face of the movable-side flat plate, an outer peripheral face of the fixed-side wrap, and an inner peripheral face of the movable-side wrap. The fixed scroll and the movable scroll are disposed in an upper part of the internal space in the casing. The fixed scroll has a first passage configured to guide the gas refrigerant in the low-pressure space to the first compression chamber and the second compression chamber. The movable scroll has a second passage configured to guide the gas refrigerant in the low-pressure space to the first compression chamber. The gas refrigerant that has passed through the first passage and the gas refrigerant that has passed through the second passage flows into the first compression chamber. The gas refrigerant that has passed through the first passage also flows into the second compression chamber.

