Air-conditioning apparatus

Patent metadata

Field	Value
Publication number	US-11460229-B2
Application number	US-201916976568-A
Country	US
Kind code	B2
Filing date	Apr 11, 2019
Priority date	Apr 12, 2018
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

An air-conditioning apparatus includes a refrigerant circuit that is formed of an outdoor unit and an indoor unit connected through indoor/outdoor connection pipes. The outdoor unit includes a compressor, an outdoor heat exchanger, and an expansion valve. The indoor unit includes an indoor heat exchanger. Combustible refrigerant is used as refrigerant flowing through the refrigerant circuit. The outdoor unit includes a refrigerant filling-dedicated connection port to fill the refrigerant and an evacuation-dedicated connection port to evacuate the refrigerant inside the refrigerant circuit. The refrigerant filling-dedicated connection port is provided inside a machine chamber that accommodates the compressor and the expansion valve, and the evacuation-dedicated connection port is provided outside the machine chamber.

First claim

The invention claimed is:

1. An air-conditioning apparatus including a refrigerant circuit that is formed of an outdoor unit and an indoor unit connected through indoor/outdoor connection pipes, the outdoor unit including a compressor, an outdoor heat exchanger, and an expansion valve, the indoor unit including an indoor heat exchanger, wherein
combustible refrigerant is used as refrigerant flowing through the refrigerant circuit, and
the outdoor unit includes a refrigerant filling-dedicated connection port to fill the refrigerant and an evacuation-dedicated connection port to evacuate the refrigerant inside the refrigerant circuit, the refrigerant filling-dedicated connection port being provided inside a machine chamber that accommodates the compressor and the expansion valve, the evacuation-dedicated connection port being provided outside the machine chamber.

2. The air-conditioning apparatus of claim 1 , wherein a charge valve to which a quick joint of a refrigerant filling tool is connected is used as the refrigerant filling-dedicated connection port.

3. The air-conditioning apparatus of claim 1 , wherein a refrigerant filling-dedicated connection port is attached to a pipe connecting a suction side of the compressor and a gas pipe closing valve that is provided to a pipe between the suction side of the compressor and the indoor heat exchanger.

4. The air-conditioning apparatus of claim 3 , wherein
the outdoor unit further includes a refrigerant flow switch configured to switch a flow of the refrigerant discharged from the compressor, and
the refrigerant filling-dedicated connection port is attached to a pipe connecting the refrigerant flow switch and the suction side of the compressor.

5. The air-conditioning apparatus of claim 3 , wherein
the outdoor unit further includes a refrigerant flow switch configured to switch a flow of the refrigerant discharged from the compressor, and
the refrigerant filling-dedicated connection port is attached to a pipe connecting the gas pipe closing valve and the refrigerant flow switch.

6. The air-conditioning apparatus of claim 1 , wherein
the outdoor unit further includes, inside the machine chamber, a housing unit that has an internal space shut off from an internal space of the machine chamber, and
the refrigerant filling-dedicated connection port is housed in the housing unit.

7. The air-conditioning apparatus of claim 6 , wherein
the housing unit includes an opening port surface communicating with outside of the outdoor unit, and a lid provided to cover the opening port surface, and
the lid is provided with a communication hole communicating with the outside.

8. The air-conditioning apparatus of claim 6 , wherein the lid includes a display unit configured to display that the refrigerant filling-dedicated connection port is housed in the housing unit.

9. The air-conditioning apparatus of claim 1 , wherein the refrigerant filling-dedicated connection port includes a cap provided with a hexagonal fastening groove.

10. The air-conditioning apparatus of claim 1 , wherein the refrigerant filling-dedicated connection port includes a hexagonal cap.

11. The air-conditioning apparatus of claim 1 , wherein the evacuation-dedicated connection port is configured such that the refrigerant can be evacuated, via the evacuation-dedicated connection port, from the refrigerant circuit to outside the refrigerant circuit.

12. The air-conditioning apparatus of claim 1 , wherein:
the outdoor unit further comprises an outer shell, and
an inner side of the outer shell faces the machine chamber and an outer side of the outer shell faces away from the machine chamber.

13. The air-conditioning apparatus of claim 12 , wherein the evacuation-dedicated connection port is located outside the machine chamber on the outer side of the outer shell and the refrigerant filling-dedicated connection port is located inside the machine chamber on the inner side of the outer shell.

Assignees

• Mitsubishi Electric Corp

Inventors

• Makino Hiroaki

Classifications

• F25B2345/001

  Charging refrigerant to a cycle · CPC title

• F25B2400/12

  Inflammable refrigerants · CPC title

• F25B2345/006

  characterised by charging or discharging valves · CPC title

• F25B13/00

  Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02) · CPC title

• F16L37/23 Primary

  by means of balls · CPC title