Air conditioning apparatus and outdoor unit

Patent metadata

Field	Value
Publication number	US-2022214081-A1
Application number	US-201917614235-A
Country	US
Kind code	A1
Filing date	Jul 22, 2019
Priority date	Jul 22, 2019
Publication date	Jul 7, 2022
Grant date	—

Abstract

In an air conditioning apparatus, heat exchange is conducted between refrigerant passing through a first high-temperature-side flow path and refrigerant passing through a first low-temperature-side flow path of a cooler, and between refrigerant passing through a second high-temperature-side flow path and refrigerant passing through a second low-temperature-side flow path of the cooler. A switching device switches between first/second refrigerant circuits. In the first circuit, an inlet of the first high-temperature-side flow path is formed downstream of the first low-temperature-side flow path with respect to an outlet of the first high-temperature-side flow path, and in the second refrigerant circuit, an inlet of the second high-temperature-side flow path is formed downstream of the second low-temperature-side flow path with respect to an outlet of the second high-temperature-side flow path.

First claim

1 . An air conditioning apparatus comprising:
a compressor that compresses a refrigerant; a pressure-reducing device that reduces a pressure of the refrigerant; a heat source-side heat exchanger that makes heat exchange to be conducted between the refrigerant and a heat source-side heat medium; a load-side heat exchanger that makes heat exchange to be conducted between the refrigerant and a load-side heat medium; a cooler that cools the refrigerant; a flow path switching device that switches a refrigerant circuit in which the refrigerant circulates; and a refrigerant piping that connects the compressor, the pressure-reducing device, the heat source-side heat exchanger, the load-side heat exchanger, the cooler, and the flow path switching device, wherein the high-temperature-side flow path includes a first high-temperature-side flow path and a second high-temperature-side flow path, the low-temperature-side flow path includes a first low-temperature-side flow path and a second low-temperature-side flow path, heat exchange is conducted between the refrigerant passing through the first high-temperature-side flow path and the refrigerant passing through the first low-temperature-side flow path, and heat exchange is conducted between the refrigerant passing through the second high-temperature-side flow path and the refrigerant passing through the second low-temperature-side flow path, the flow path switching device switches between a first refrigerant circuit in which the refrigerant circulates in order of the compressor, the heat source-side heat exchanger, the first high-temperature-side flow path, the pressure-reducing device, the load-side heat exchanger, the first low-temperature-side flow path, and the compressor, and a second refrigerant circuit in which the refrigerant circulates in order of the compressor, the load-side heat exchanger, the second high-temperature-side flow path, the pressure-reducing device, the heat source-side heat exchanger, the second low-temperature-side flow path, and the compressor, wherein in the first refrigerant circuit, an inlet port of the first high-temperature-side flow path is formed at a place located downstream of the refrigerant flowing through the first low-temperature-side flow path with respect to an outlet port of the first high-temperature-side flow path, and in the second refrigerant circuit, an inlet port of the second high-temperature-side flow path is formed at a place located downstream of the refrigerant flowing through the second low-temperature-side flow path with respect to an outlet port of the second high-temperature-side flow path.

2 . The air conditioning apparatus according to claim 1 ,
wherein the refrigerant flowing from the heat source-side heat exchanger to the first high-temperature-side flow path in the first refrigerant circuit is in a gas-liquid two-phase state, and the refrigerant flowing from the load-side heat exchanger to the second high-temperature-side flow path in the second refrigerant circuit is in a gas-liquid two-phase state.

3 . The air conditioning apparatus according to claim 1 ,
wherein the refrigerant flowing from the first high-temperature-side flow path to the pressure-reducing device in the first refrigerant circuit is in a liquid state, and the refrigerant flowing from the second high-temperature-side flow path to the pressure-reducing device in the second refrigerant circuit is in a liquid state.

4 - 6 . (canceled)

7 . The air conditioning apparatus according to claim 1 ,
wherein in the first refrigerant circuit, the refrigerant circulates in order of the compressor, the heat source-side heat exchanger, the first high-temperature-side flow path, the pressure-reducing device, the second high-temperature-side flow path, the load-side heat exchanger, one of the first low-temperature-side flow path and the second low-temperature-side flow path, the other of the first low-temperature-side flow path and the second low-temperature-side flow path, and the compressor, and in the second refrigerant circuit, the refrigerant circulates in order of the compressor, the load-side heat exchanger, the second high-temperature-side flow path, the pressure-reducing device, the first high-temperature-side flow path, the heat source-side heat exchanger, one of the first low-temperature-side flow path and the second low-temperature-side flow path, the other of the first low-temperature-side flow path and the second low-temperature-side flow path, and the compressor.

8 . The air conditioning apparatus according to claim 1 ,
wherein in the first refrigerant circuit, a flow direction of the refrigerant flowing through the first high-temperature-side flow path is opposite to a flow direction of the refrigerant flowing through the first low-temperature-side flow path, and in the second refrigerant circuit, a flow direction of the refrigerant flowing through the second high-temperature-side flow path is opposite to a flow direction of the refrigerant flowing through the second low-temperature-side flow path.

9 . (canceled)

10 . The air conditioning apparatus according to claim 1 ,
wherein the cooler includes a first piping forming the low-temperature-side flow path and a second piping forming the high-temperature-side flow path, the second piping being spirally wound around the first piping.

11 . The air conditioning apparatus according to claim 1 ,
wherein the refrigerant is a flammable refrigerant.

12 . The air conditioning apparatus according to claim 1 ,
wherein the refrigerant is R290.

13 . The air conditioning apparatus according to claim 8 ,
wherein a chiller oil of the compressor is polyalkylene glycol.

14 . An outdoor unit comprising:
a compressor that compresses a refrigerant; a pressure-reducing device that reduces a pressure of the refrigerant; a heat source-side heat exchanger that makes heat exchange to be conducted between the refrigerant and a heat source-side heat medium; a cooler that cools the refrigerant; a flow path switching device that switches a refrigerant circuit in which the refrigerant circulates; a refrigerant piping that connects the compressor, the pressure-reducing device, the heat source-side heat exchanger, the cooler, and the flow path switching device; a first piping connection portion connected to one end portion of a load-side heat exchanger flow path via a piping, the load-side heat exchanger flow path being formed in a load-side heat exchanger that makes heat exchange to be conducted between the refrigerant and a load-side heat medium; and a second piping connection portion connected to the other end portion of the load-side heat exchanger flow path via a piping, wherein a high-temperature-side flow path and a low-temperature-side flow path are formed in the cooler,
the high-temperature-side flow path includes a first high-temperature-side flow path and a second high-temperature-side flow path,
the low-temperature-side flow path includes a first low-temperature-side flow path and a second low-temperature-side flow path, heat exchange is conducted between the refrigerant passing through the first high-temperature-side flow path and the refrigerant passing through the first low-temperature-side flow path, and heat exchange is conducted between the refrigerant passing through the second high-temperature-side flow path and the refrigerant passing through the second low-temperature-side flow path, wherein the flow path switching device switches between a first refrigerant circuit and a second refrigerant circuit, the first refrigerant circuit that flows the refrigerant in order of the second piping connection portion, the firs

Assignees

• Mitsubishi Electric Corp

Inventors

• Makino Hiroaki
• Ishida Hirotaka

Classifications

• F25B40/02

  Subcoolers · CPC title

• F25B2313/02741

  using one four-way valve · CPC title

• F25B13/00 Primary

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

• F25B2313/006

  two pipes connecting the outdoor side to the indoor side with multiple indoor units · CPC title

• F25B25/005

  using primary and secondary systems · CPC title