Air-conditioning apparatus with regulation of injection flow rate
First Claim
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1. An air-conditioning apparatus having a refrigeration cycle including a compressor, a first heat exchanger, a first expansion device, and a plurality of second heat exchangers that are connected by pipes, the air-conditioning apparatus comprising:
- a suction-injection pipe configured to introduce, into a suction side of the compressor, injection refrigerant that is drawn from a refrigerant flow passage through which refrigerant that transfers heat in the first heat exchanger or the second heat exchangers circulates, wherein the injection refrigerant is in a liquid or a two-phase state;
a second expansion device arranged at the suction-injection pipe;
a controller configured to regulate, by controlling an opening degree of the second expansion device, a suction-injection flow rate of the injection refrigerant into the suction side of the compressor through the suction-injection pipe;
a first branching unit configured to draw refrigerant from the refrigerant flow passage in a case in which the refrigerant flows from the first heat exchanger to the first expansion device;
a second branching unit configured to draw refrigerant from the refrigerant flow passage in a case in which the refrigerant flows from the first expansion device to the first heat exchanger;
a branch pipe configured to connect the first branching unit with the second branching unit, wherein the branch pipe is connected to the suction-injection pipe at a connection portion;
a first conduction device arranged between the first branching unit and the connection portion; and
a second conduction device arranged between the second branching unit and the connection portion.
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Abstract
An air-conditioning apparatus includes a suction-injection pipe that introduces a refrigerant in a liquid or two-phase state into a suction side of a compressor, an expansion device that is arranged at the suction-injection pipe, and a controller that regulates the suction-injection flow rate of a refrigerant introduced into the suction side of the compressor through the suction-injection pipe by controlling the opening degree of the expansion device.
28 Citations
18 Claims
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1. An air-conditioning apparatus having a refrigeration cycle including a compressor, a first heat exchanger, a first expansion device, and a plurality of second heat exchangers that are connected by pipes, the air-conditioning apparatus comprising:
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a suction-injection pipe configured to introduce, into a suction side of the compressor, injection refrigerant that is drawn from a refrigerant flow passage through which refrigerant that transfers heat in the first heat exchanger or the second heat exchangers circulates, wherein the injection refrigerant is in a liquid or a two-phase state; a second expansion device arranged at the suction-injection pipe; a controller configured to regulate, by controlling an opening degree of the second expansion device, a suction-injection flow rate of the injection refrigerant into the suction side of the compressor through the suction-injection pipe; a first branching unit configured to draw refrigerant from the refrigerant flow passage in a case in which the refrigerant flows from the first heat exchanger to the first expansion device; a second branching unit configured to draw refrigerant from the refrigerant flow passage in a case in which the refrigerant flows from the first expansion device to the first heat exchanger; a branch pipe configured to connect the first branching unit with the second branching unit, wherein the branch pipe is connected to the suction-injection pipe at a connection portion; a first conduction device arranged between the first branching unit and the connection portion; and a second conduction device arranged between the second branching unit and the connection portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification