Refrigeration cycle apparatus

Patent metadata

Field	Value
Publication number	US-11859882-B2
Application number	US-202217948410-A
Country	US
Kind code	B2
Filing date	Sep 20, 2022
Priority date	Mar 27, 2020
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

A refrigeration cycle apparatus uses a sensor that measures temperature of a plurality of refrigerant pipes in a contactless manner. A refrigeration cycle apparatus includes a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, an expansion mechanism, and a use-side heat exchanger are connected in sequence. The refrigeration cycle apparatus includes a temperature detector that detects temperatures at a plurality of points in a contactless manner, and a heat-source-side controller. At least one heat-source-side heat exchanger and the use-side heat exchanger includes a plurality of refrigerant pipes through which refrigerant to be heat-exchanged flows, and a flow rate adjuster. The flow rate adjuster adjusts flow rate of the refrigerant flowing through each of the plurality of refrigerant pipes. The temperature detector detects respective temperatures of the plurality of refrigerant pipes. The heat-source-side controller controls the flow rate adjustment unit based on the temperatures detected by the temperature detector.

First claim

The invention claimed is:

1. A refrigeration cycle apparatus including a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, an expansion mechanism, and a use-side heat exchanger are connected in sequence, the refrigeration cycle apparatus comprising:
a temperature detector, including at least one radiation thermometer that measures an intensity of infrared or visible light emitted from a surface, that detects temperatures at a plurality of points in a contactless manner; and
a controller, wherein
at least one of the heat-source-side heat exchanger and the use-side heat exchanger includes
a plurality of refrigerant pipes through which refrigerant to be heat-exchanged flows,
a branch unit in which the flow of the refrigerant to be heat-exchanged is distributed to the plurality of refrigerant pipes,
a flow rate adjustment unit including a valve capable of adjusting a flow rate of the refrigerant flowing through each of the plurality of refrigerant pipes, and
a header in which the flows of the refrigerant distributed to the plurality of refrigerant pipes and heat-exchanged in the heat-source-side heat exchanger are joined together,

the temperature detector detects, for each of the plurality of refrigerant pipes, surface temperatures at a plurality of points near an outlet of a respective refrigerant pipe,
the controller controls the flow rate adjustment unit on the basis of the temperatures detected by the temperature detector so that the surface temperatures near the outlets of the plurality of refrigerant pipes become uniform, and
the controller detects, on the basis of the temperatures detected at the plurality of points along a respective refrigerant pipe by the temperature detector, a decrease in the surface temperatures of the refrigerant pipes due to leakage of refrigerant from the refrigerant pipes, to identify a failure caused in the respective refrigerant pipes.

2. The refrigeration cycle apparatus according to claim 1 , wherein
the flow rate adjuster includes the valve whose opening degree is adjustable, the valve being disposed in at least one of the plurality of refrigerant pipes, and
the controller adjusts the opening degree of each valve on the basis of the temperatures detected by the temperature detector.

3. The refrigeration cycle apparatus according to claim 1 , wherein the temperature detector detects the temperatures of the plurality of refrigerant pipes by performing a surface measurement using an array sensor.

4. The refrigeration cycle apparatus according to claim 1 , wherein the temperature detector detects the temperatures of the plurality of refrigerant pipes by performing a line measurement while scanning with a single sensor.

5. The refrigeration cycle apparatus according to claim 1 , wherein
the controller
controls the flow rate adjuster so that, when the heat-source-side heat exchanger or the use-side heat exchanger functions as a heat absorber, the flow rate of the refrigerant flowing through a pipe having a relatively high temperature among the plurality of refrigerant pipes increases or the flow rate of the refrigerant flowing through a pipe having a relatively low temperature among the plurality of refrigerant pipes decreases, and
controls the flow rate adjuster so that, when the heat-source-side heat exchanger or the use-side heat exchanger functions as a radiator, the flow rate of the refrigerant flowing through a pipe having a relatively high temperature among the plurality of refrigerant pipes decreases or the flow rate of the refrigerant flowing through a pipe having a relatively low temperature among the plurality of refrigerant pipes increases.

6. The refrigeration cycle apparatus according to claim 2 , wherein the temperature detector detects the temperatures of the plurality of refrigerant pipes by performing a surface measurement using an array sensor.

7. The refrigeration cycle apparatus according to claim 2 , wherein the temperature detector detects the temperatures of the plurality of refrigerant pipes by performing a line measurement while scanning with a single sensor.

8. The refrigeration cycle apparatus according to claim 2 , wherein the temperature detector measures respective surface temperatures of the plurality of refrigerant pipes.

9. The refrigeration cycle apparatus according to claim 3 , wherein the temperature detector measures respective surface temperatures of the plurality of refrigerant pipes.

10. The refrigeration cycle apparatus according to claim 4 , wherein the temperature detector measures respective surface temperatures of the plurality of refrigerant pipes.

11. The refrigeration cycle apparatus according to claim 2 , wherein
the controller
controls the flow rate adjuster so that, when the heat-source-side heat exchanger or the use-side heat exchanger functions as a heat absorber, the flow rate of the refrigerant flowing through a pipe having a relatively high temperature among the plurality of refrigerant pipes increases or the flow rate of the refrigerant flowing through a pipe having a relatively low temperature among the plurality of refrigerant pipes decreases, and
controls the flow rate adjuster so that, when the heat-source-side heat exchanger or the use-side heat exchanger functions as a radiator, the flow rate of the refrigerant flowing through a pipe having a relatively high temperature among the plurality of refrigerant pipes decreases or the flow rate of the refrigerant flowing through a pipe having a relatively low temperature among the plurality of refrigerant pipes increases.

12. The refrigeration cycle apparatus according to claim 3 , wherein
the controller
controls the flow rate adjuster so that, when the heat-source-side heat exchanger or the use-side heat exchanger functions as a heat absorber, the flow rate of the refrigerant flowing through a pipe having a relatively high temperature among the plurality of refrigerant pipes increases or the flow rate of the refrigerant flowing through a pipe having a relatively low temperature among the plurality of refrigerant pipes decreases, and
controls the flow rate adjuster so that, when the heat-source-side heat exchanger or the use-side heat exchanger functions as a radiator, the flow rate of the refrigerant flowing through a pipe having a relatively high temperature among the plurality of refrigerant pipes decreases or the flow rate of the refrigerant flowing through a pipe having a relatively low temperature among the plurality of refrigerant pipes increases.

13. The refrigeration cycle apparatus according to claim 4 , wherein
the controller
controls the flow rate adjuster so that, when the heat-source-side heat exchanger or the use-side heat exchanger functions as a heat absorber, the flow rate of the refrigerant flowing through a pipe having a relatively high temperature among the plurality of refrigerant pipes increases or the flow rate of the refrigerant flowing through a pipe having a relatively low temperature among the plurality of refrigerant pipes decreases, and
controls the flow rate adjuster so that, when the heat-source-side heat exchanger or the use-side heat exchanger functions as a radiator, the flow rate of the refrigerant flowing through a pipe having a relatively high temperature among the plurality of refrigerant pipes decreases or the flow rate of the refrigerant flowing through a pipe having a relatively low temperature among the plurality of refrigerant pipes increases.

Assignees

• Daikin Ind Ltd

Inventors

• Kaji Ryuhei
• Fujino Hirokazu
• Furusho Kazuhiro

Classifications

• F25B41/20 Primary

  Disposition of valves, e.g. of on-off valves or flow control valves (expansion valves F25B41/31) · CPC title

• F25B13/00

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

• F25B49/02 Primary

  for compression type machines, plants or systems · CPC title

• F25B39/028

  having distributing means · CPC title

• F25B41/48

  for flow path resistance control on the downstream side of the diverging point, e.g. by an orifice · CPC title