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Heat exchanger and refrigeration device

A technology for heat exchangers and refrigeration devices, applied in the field of refrigeration devices and heat exchangers, can solve problems such as poor compatibility and reduced heat transfer performance, and achieve the effects of increasing contact area, promoting heat transfer, and ensuring the amount of oil returned

Inactive Publication Date: 2009-09-02
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because this oil has poor compatibility with carbon dioxide, it is easy to form the oil film in the heat transfer tube of the heat exchanger
Therefore, in a heat exchanger used in a refrigeration unit using carbon dioxide as a refrigerant, the heat transfer performance is significantly reduced due to the formation of an oil film

Method used

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  • Heat exchanger and refrigeration device
  • Heat exchanger and refrigeration device

Examples

Experimental program
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Effect test

no. 1 approach 》

[0075] The heat exchanger according to the first embodiment of the present invention is used in a refrigeration device 1 that performs a vapor compression refrigeration cycle. The refrigeration system according to the first embodiment constitutes an air conditioner 1 capable of switching between indoor cooling and heating.

[0076]

[0077] like figure 1 As shown, the air conditioning device 1 includes a refrigerant circuit 10 filled with refrigerant. The refrigerant circuit 10 is filled with carbon dioxide as a refrigerant. In this air conditioner 1, polyalkylene glycol (PAG), which is a polar oil, acts as lubricating oil (refrigerating machine oil) for lubricating each sliding portion of the compressor 11 . And, this PAG flows into the refrigerant circuit 10 together with the refrigerant discharged from the compressor 11 . Therefore, in the refrigerant circuit 10, carbon dioxide as a refrigerant and PAG as refrigerating machine oil circulate together. In addition, in t...

no. 2 approach 》

[0097] In the heat exchangers 12 and 13 according to the second embodiment of the present invention, the structure of the heat transfer tube 22 is different from that of the first embodiment. Specifically, as Figure 7 As shown, a plurality of oil grooves 25 are formed in the heat transfer tube 22 of the second embodiment, and the number of the oil grooves 25 is more than that of the first embodiment. Similar to the first embodiment, the oil groove 25 extends in the axial direction of the heat transfer tube 22 .

[0098] In addition, in the second embodiment, the lipophilic layer 27 made of lipophilic material is formed on the bottom surface 25b of the oil groove 25 by surface coating. In addition, examples of lipophilic materials constituting the lipophilic layer 27 include water glass, acrylic, epoxy resin, polyvinyl alcohol, and the like. On the other hand, an oil-repellent layer 28 made of an oil-repellent material is formed on the entire inner wall surface of the heat t...

no. 3 approach 》

[0105] In the heat exchangers 12 and 13 according to the third embodiment of the present invention, the structure of the heat transfer tube 22 is different from the above-mentioned first and second embodiments. Specifically, as Figure 9As shown, a plurality of oil grooves 25 extending in a “V” shape are formed on the inner wall surface of the heat transfer tube 22 of the third embodiment. The V-shaped oil groove 25 is formed by connecting the top ends of a pair of grooves 25c, 25c inclined to the axial direction of the heat transfer tube 22 . In addition, each oil groove 25 is arranged in the axial direction of the heat transfer tube 22, and is spaced apart from each other at predetermined intervals. In addition, in each oil groove 25 , a “V”-shaped tip portion 25 d formed by connecting a pair of grooves 25 c and 25 c faces the refrigerant outflow side of the heat transfer tube 22 . That is, the “V”-shaped top ends 25d of the respective oil grooves 25 are directed to the sa...

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Abstract

The invention provides a heat exchanger and refrigeration device. An oil grooves (25) for collecting oil and causing it to flow are formed in the inner peripheral surface of a heat transmission tube (22) of heat exchangers (12, 13) so as to extend in the direction of the axis of the heat transmission tube (22).

Description

technical field [0001] The present invention relates to a heat exchanger used in a refrigerating device performing a refrigerating cycle and a refrigerating device having the heat exchanger, in particular to a scheme for promoting heat transfer of the heat exchanger. Background technique [0002] Conventionally, refrigerating devices that perform a vapor compression refrigeration cycle are known, and such refrigerating devices are widely used in air conditioners, water heaters, and the like. [0003] For example, the air conditioner disclosed in Patent Document 1 has a refrigerant circuit in which a compressor, an outdoor heat exchanger, an expander, and an indoor heat exchanger are connected. In this refrigerant circuit, carbon dioxide is filled as a refrigerant. [0004] In the cooling operation of the air conditioner, the refrigerant compressed by the compressor to a critical pressure or higher flows through the outdoor heat exchanger. In the outdoor heat exchanger, the...

Claims

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Application Information

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IPC IPC(8): F28F1/40F25B1/00F25B39/00
CPCF28D1/0477F28F1/32F28F17/005F25B39/00F25B43/02F28F13/185F28F1/40
Inventor 吉冈俊金铉永笠井一成织谷好男
Owner DAIKIN IND LTD
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