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Heat transfer tube for heat exchanger, heat exchanger, refrigeration cycle device, and air conditioning device

A technology for heat exchangers and circulation devices, applied in the field of heat transfer tubes, can solve the problems of reduced close contact between heat transfer tubes and fins, reduced heat transfer performance, increased pressure loss, etc. The effect of elastic and improved close contact

Inactive Publication Date: 2012-10-03
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that, when the tube is expanded, the peak portion is crushed by the tube expander ball, and the tight contact between the heat transfer tube and the fins is reduced, and the pressure loss inside the tube becomes large, resulting in a decrease in heat transfer performance.

Method used

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  • Heat transfer tube for heat exchanger, heat exchanger, refrigeration cycle device, and air conditioning device
  • Heat transfer tube for heat exchanger, heat exchanger, refrigeration cycle device, and air conditioning device
  • Heat transfer tube for heat exchanger, heat exchanger, refrigeration cycle device, and air conditioning device

Examples

Experimental program
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Effect test

Embodiment approach 1

[0029] exist figure 1 Among them, the heat exchanger 1 is a finned tube type heat exchanger widely used as an evaporator or a condenser of a refrigeration device, an air conditioner, or the like.

[0030] The heat exchanger 1 is composed of a plurality of heat exchanger fins 10 and heat transfer tubes 20 . A through-hole 11 is provided in each of the plurality of fins 10 arranged in parallel at predetermined intervals, and the heat transfer tube 20 penetrates through the through-hole 11 . The heat transfer tube 20 becomes a part of the refrigerant circuit in the refrigerating cycle apparatus, and the heat of the refrigerant flowing inside the heat transfer tube 20 and the air flowing outside is transferred through the fins 10, thereby expanding the heat transfer area, and the refrigerant and the Air heat exchange is performed efficiently.

[0031] Such as figure 2 As shown, the tube inner surface of the heat transfer tube 20 is provided with grooves 21 and peaks 22 through...

Embodiment approach 2

[0042] Figure 6 The shape of the tube inner surface of the heat transfer tube 20 according to the second embodiment of the present invention is shown, and the structure of the heat exchanger 1 is the same as that of the first embodiment. In addition, the same code|symbol is attached|subjected to the part which plays the same or equivalent function as Embodiment 1 (it is also the same in the following embodiment). In this embodiment, the difference H between the groove portion 21 and the peak portion 22 after pipe expansion will be described.

[0043] Figure 7 The relationship between the difference between the groove portion 21 and the peak portion 22 after tube expansion (the peak portion 22a after tube expansion) and the heat exchange rate is shown. In the heat transfer tube 20, the groove portion 21 and the peak portion after tube expansion The larger the difference H between 22, the larger the surface area inside the tube, etc., and the higher the thermal conductivity....

Embodiment approach 3

[0046] Figure 8 The shape of the tube inner surface of the heat transfer tube 20 according to Embodiment 3 of the present invention is shown, and the straight line parallel to the tube axis direction and the groove part (spiral groove) 21 (peak part 22 ) of the tube inner surface of the heat transfer tube 20 extend. The angle (lead angle or torsion angle) γ formed by the direction is 10 degrees to 50 degrees.

[0047] Figure 9 The relationship between the lead angle γ of the groove portion (spiral groove) 21 of the heat transfer tube 20 and the heat exchange rate is shown. Basically, the lead angle γ of the groove portion (spiral groove) 21 of the heat transfer tube 20 is set at The range of 10° to 50° is because when the lower limit of the lead angle γ of the groove portion (spiral groove) 21 is 10° or less, the decrease in heat exchange rate becomes remarkable, and when the groove portion (spiral groove) When the upper limit of the lead angle γ of 21 is 50 degrees or mor...

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Abstract

High ridges (22a) and low ridges (22b) lower than the high ridges are helically provided on the inner surface of a tube (20) so as to be arranged in the axis direction thereof, and the high ridges (22a) and the low ridges (22b) have predetermined heights. The number of the high ridges (22a) is from 11 to 19, and the number of the low ridges (22b) which are formed between adjacent high ridges (22a) is from 3 to 6. The crests of the high ridges (22a) have, before the diameter of the tube is expanded, a trapezoidal cross-sectional shape having a flat top, and the ratio (W1 / D) between the width (W1) of the tip of the top and the outer diameter (D) of the heat transfer tube (20) is from 0.011 to 0.040 after the diameter of the tube is expanded. Also, the height of the high ridges (22a) before the diameter of the tube is expanded is greater by 0.04 mm or more than the height of the low ridges (22b).

Description

technical field [0001] The present invention relates to a heat transfer tube for a heat exchanger having grooves on the inner surface of the tube, a heat exchanger, a refrigeration cycle device, and an air conditioner. Background technique [0002] Conventionally, in heat exchangers used in refrigerators, air conditioners, heat pumps, etc., generally, a plurality of fins arranged side by side at predetermined intervals are provided with through holes, and the inner surface is arranged in the through holes. Slotted heat transfer tubes. The heat transfer tube becomes a part of the refrigerant circuit in the refrigeration cycle device, and the refrigerant (fluid) flows inside the tube. [0003] The grooves on the inner surface of the tube are processed so that the direction of the tube axis is at a certain angle to the direction in which the grooves extend. Here, grooves are formed to form irregularities on the inner surface of the pipe, and the spaces of the recesses are cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F1/40F28F1/32
CPCF28D2021/0071F28F1/32F28D1/0477F28F2275/125F25B39/00F28F1/40F28D2021/007
Inventor 李相武小野田彻松田拓也石桥晃
Owner MITSUBISHI ELECTRIC CORP
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