Heat-transfer tube with groove on inwall and method for manufacturing heat exchanger using the heat-transfer tube

A manufacturing method and heat exchanger technology, applied in heat exchange equipment, tubular elements, lighting and heating equipment, etc., can solve the problems of reduced condensation performance, insufficient performance, difficult condensation performance, etc., and achieve the effect of suppressing deformation

Inactive Publication Date: 2007-05-23
SUMITOMO LIGHT METAL INDS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In particular, the influence of fin deformation during such mechanical expansion on heat exchange performance is significant during condensing operation. Therefore, heat transfer for heat exchangers used in indoor units of room air conditioners that place emphasis on heating performance In spite of this, this becomes the main cause of the fatal underperformance
Among them, until now, for tubes with grooves on the inner wall, it has been more difficult to improve condensation performance than to improve evaporation performance
From this situation, the reduction of condensation performance due to the deformation of the fins during the above-mentioned mechanical expansion is also a big problem.

Method used

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  • Heat-transfer tube with groove on inwall and method for manufacturing heat exchanger using the heat-transfer tube
  • Heat-transfer tube with groove on inwall and method for manufacturing heat exchanger using the heat-transfer tube
  • Heat-transfer tube with groove on inwall and method for manufacturing heat exchanger using the heat-transfer tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First, the outer diameter of the tube is 4-10mm, the depth (d) of the groove is 0.1-0.3mm, the helix angle of the groove is 10-30°, the fin top angle (α) is 20-40°, and the number of grooves is 30 In the range of ~80, through the same copper tube rolling process as in the past, various tubes (2) with spiral grooves on the inner wall were trial-manufactured, and then mechanically expanded at a tube expansion rate of 4 to 7% as in Figure 1. Tubes, assemble the tubes (2) into the aluminum fins (4) to make heat exchangers respectively.

[0036] Next, the aluminum fins (4) were removed from the obtained heat exchanger, and the tubes (2) with inner spiral grooves after tube expansion were sampled to investigate the base wall thickness of each. As a result, it can be found that for tubes whose base wall thickness (t) is reduced by 8 μm or more after tube expansion compared with the base wall thickness (t) before tube expansion, fin deformation such as fin destruction or fin lo...

Embodiment 2

[0039] As in Example 1, a tube with a spiral groove on the inner wall with an outer diameter between 6 and 9.52 mm was trial-produced by rolling a copper tube, and the base wall thickness (t) was changed, and two rows of 8 tubes were further produced by mechanical expansion. segment heat exchanger. Utilize in Fig. 2 the reduction (δ f ) and the reduction of base wall thickness (δ t ), to detect the decrease in fin height after tube expansion (δ f ) and the reduction of base wall thickness (δ t ), record the results and the dimensions of the trial-manufactured tubes before expansion into the table below:

[0040] Example of the invention

[0041] As can be seen from the results in Table 1, each of the trial pipes related to Examples 1 to 4 of the present invention is due to the base wall thickness reduction (δ t ) is above 8μm, so the fin after tube expansion is destroyed (δ f ) is less than 9 μm, therefore, it can be considered that the effect of sufficiently ...

Embodiment 3

[0043] In order to confirm the influence of the effect of preventing fin deformation during tube expansion on the performance of the heat exchanger, using the trial tubes of Example 4 of the present invention and Comparative Example 6 shown in Table 1 above, the individual heat exchangers produced separately were tested. performance evaluation. That is, using the measurement conditions shown in Table 2 below, in the case of circulating the cooling medium as shown in Figure 4 or Figure 5, an evaporation test or a condensation test that reflects the performance of the heat exchanger as a single unit is implemented according to a known method, and the investigation is carried out. The evaporation capacity (cooling capacity) and condensation capacity (warming capacity) in each heat exchanger unit are shown in Fig. 6 and Fig. 7 respectively as heat exchange capacity-front wind speed curves.

[0044] test

evaporate

condensation

air side

dry bulb temperatu...

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PUM

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Abstract

A technology for manufacturing the heat transfer tube with slotted inner surface and the heat exchanger unit said heat transfer tube is disclosed. Multiple slots whose depth is 0.1-0.3 mm are made on the inner surface of a tube whose external diameter is 4-10 mm while the fins between adjacent slots, which has a certain height, are formed.

Description

technical field [0001] The present invention relates to a heat transfer tube with grooves on the inner wall constituting a heat exchanger used in refrigeration and air conditioners represented by air conditioners and a method for manufacturing a heat exchanger using the heat transfer tube, especially to a heat transfer tube with grooves on the inner wall The technology of suppressing the deformation of the inner wall fins during the mechanical expansion of the tube. Background technique [0002] Conventionally, as a heat transfer tube with grooves on the inner wall used in refrigerators and air conditioners represented by air conditioners, the following structure has been known. Helical grooves, between which are formed inner wall fins of a set height. Such a tube with grooves on the inner wall is used in a heat exchanger, and the structure of the heat exchanger is as follows: in the state where a plurality of heat transfer tubes extend in the horizontal direction, aluminum...

Claims

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Application Information

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IPC IPC(8): F28F1/40B21D39/20B21D53/08
Inventor 佐佐木直荣近藤隆司柿山史郎
Owner SUMITOMO LIGHT METAL INDS LTD
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