AIR-CONDITIONING DEVICE

摘要

An air-conditioning apparatus includes a refrigerant circuit including a low-pressure shell structure compressor into which a refrigerant flowing through an injection pipe flows, a first heat exchanger, a second heat exchanger, a first expansion device, a refrigerant flow switching device, and a second expansion device configured to allow the refrigerant which has passed through the first expansion device and flows from the second heat exchanger to the first heat exchanger to have an intermediate pressure, the compressor, the first heat exchanger, the second heat exchanger, the first expansion device, the refrigerant flow switching device, and the second expansion device being connected by pipes to constitute the refrigerant circuit, and further includes a controller that controls an amount of refrigerant flowing through the injection pipe into a compression chamber. While the first heat exchanger is allowed to function as a condenser, a part of a high-pressure refrigerant flowing from the first heat exchanger to the second heat exchanger is enabled to flow through the injection pipe, and while the first heat exchanger is allowed to function as an evaporator, a part of the refrigerant allowed to have the intermediate pressure by the second expansion device is enabled to flow through the injection pipe, such that a discharge temperature of the compressor is controlled so as not to become too high in any of cooling and heating operations.