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Heat transfer tube and heat exchanger with inner surface groove

A heat transfer tube, inner surface technology, applied in heat exchange equipment, tubular elements, lighting and heating equipment, etc., can solve problems such as the reduction of heat exchange performance of heat exchangers, reduce fin crushing, ensure heat exchange performance, The effect of stabilizing heat transfer performance

Inactive Publication Date: 2011-12-21
HITACHI CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there is also the following problem. As described in the above-mentioned Patent Document 1, if a spiral fin having a fin height lower than that of a spiral fin formed at a constant height is produced, the spiral fin described in the above-mentioned Patent Document 1 will be different from the spiral fin described in the above-mentioned Patent Document 1. Compared with the fins, the heat transfer performance of the heat exchanger is reduced

Method used

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  • Heat transfer tube and heat exchanger with inner surface groove
  • Heat transfer tube and heat exchanger with inner surface groove
  • Heat transfer tube and heat exchanger with inner surface groove

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0032] The overall structure of the heat transfer tube

[0033] in figure 1 and figure 2 Here, the reference numeral 1 indicating the entirety schematically indicates the typical heat transfer tube with an inner groove of the first embodiment. The heat transfer tube 1 is made of a copper-based material such as copper or copper alloy, or an aluminum-based material such as aluminum or aluminum alloy, and has a tube main body 2 formed of a round tube.

[0034] Such as figure 1 and figure 2 As shown, the inner surface of the tube main body 2 is formed with a plurality of fins 3,..., 3 helically processed in the tube axis O direction (tube length direction). The pipe main body 2 of the illustrated example has an outer diameter do of 6.35 mm and a minimum inner diameter di of 5.61 mm. The groove bottom thickness Tw of the portion of the pipe main body 2 where the fin 3 is not present is set to 0.22 mm.

[0035] The internal structure of the heat transfer tube

[0036] The fin 3 of the h...

no. 2 approach

[0052] Heat Exchanger

[0053] Reference image 3 , image 3 The outline of fabricating a heat exchanger using the heat transfer tube 1 formed as described above is illustrated as an example. According to the figure, the aluminum thin plate-shaped fins 10 are arranged in parallel, punched and punched to have a through hole 11 with a diameter larger than the outer diameter of the heat transfer tube 1, and inserted into the tube according to a conventional method through the through hole 11 The surface of the heat transfer tube 1 is formed by roll forming and bending into a U-shape. At this time, a gap 12 is formed between the outer surface of the heat transfer tube 1 and the through hole 11 of the thin plate-shaped fin 10.

[0054] The tube expansion mandrel 20 is inserted into the heat transfer tube 1 along the tube length direction of the heat transfer tube 1 by pressing the rod 21, and the heat transfer tube 1a is expanded to form the tube expansion heat transfer tube 1a, and th...

Embodiment

[0063] Hereinafter, as more specific embodiments of the present invention, examples and comparative examples are given, and reference is made to Figure 4 ~ Figure 6 And Table 1 to Table 6, the heat transfer tube with inner groove is described in detail. In addition, in this embodiment, a typical example of a heat transfer tube with an inner groove is given, but the present invention is of course not limited to these embodiments.

[0064] Dimensions of heat transfer tube with internal groove

[0065] Using the original copper tube, the inner surface of the tube was roll-formed according to the conventional method. The fin height difference was 0.01mm, the fin height difference was 0.02mm, and the fin height difference was 0.03 under the size conditions shown in Table 1 below. 4 kinds of heat transfer tubes with a fixed height of mm and fins. As shown in Table 1 below, the average outer diameter, minimum inner diameter, bottom thickness, number of grooves, fin top angle, spiral an...

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Abstract

The present invention provides a heat transfer tube with inner surface grooves capable of reducing crushing and falling of the top of fins during tube expansion processing, and a heat exchanger with excellent heat exchange performance. For the heat transfer tube (1) with internal grooves, the ratio (Hf1 / Hf2) of the height (Hf1) of the highest first fin (4) to the height (Hf2) of the lowest second fin (5) is set as Below 1.15. The height difference between the height (Hf1) of the highest first fin (4) and the height (Hf2) of the lowest second fin (5) is set to be 0.02 mm or less.

Description

Technical field [0001] The present invention relates to a heat transfer tube with an inner surface groove and a heat exchanger with excellent heat exchange performance suitable for the case where a refrigerant flows in a tube to exchange heat with a fluid outside the tube. Background technique [0002] As an example of a heat exchanger suitable for air conditioners, refrigerators, etc., there is a plate fin tube (plate fin tube, プレ一トフインチユ一ブ) type heat exchanger in which the refrigerant is placed in the tube The flow causes the refrigerant to evaporate or condense, thereby exchanging heat with the fluid outside the tube. [0003] This plate-finned tube heat exchanger has a plurality of plate-shaped fins arranged in parallel at a certain interval, and heat transfer tubes are inserted into through holes formed by penetrating the plate-shaped fins and expanded. And formed. The heat exchanger with this structure exchanges heat between the fluid flowing between the plurality of plate-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F1/40
Inventor 二条广树法福守
Owner HITACHI CABLE
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