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 fata

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

Example Embodiment

[0034] Example 1

[0035] First, the outer diameter of the tube is 4-10mm, the depth of the groove (d) is 0.1-0.3mm, the helix angle of the groove is 10-30°, the fin tip angle (α) is 20-40°, and the number of grooves is 30 In the range of ~80, through the same copper pipe rolling process as in the past, various pipes with spiral grooves on the inner wall (2) were trial-produced. After that, the same as in Fig. 1, the pipe expansion rate was 4~7%. Assemble the tubes (2) into the aluminum fins (4) to make heat exchangers respectively.

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

Example Embodiment

[0038] Example 2

[0039] In the same way as in Example 1, a trial-produced pipe with a spiral groove on the inner wall with an outer diameter between 6 and 9.52 mm was made by rolling copper pipes, and the base wall thickness (t) was changed, and then two rows of 8 were made by mechanical expansion. Section of the heat exchanger. Using the reduction in fin height (d) defined in Figure 2 for the fin deformation shape of the inner wall fin (14) caused by mechanical expansion (δ f ) And the reduction in base wall thickness (δ t ), the reduction in the height of the fin after the tube expansion (δ f ) And the reduction in base wall thickness (δ t ), and enter the results and the dimensions of the trial-produced various tubes before expansion into the table below:

[0040] Example of the invention

[0041] It can be seen from the results in Table 1 that each of the trial-manufactured tubes related to Examples 1 to 4 of the present invention is due to the decrease in base w...

Example Embodiment

[0042] Example 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, the test tubes of Example 4 and Comparative Example 6 of the present invention shown in Table 1 above were used to implement individual heat exchangers manufactured separately Performance evaluation. That is, using the measurement conditions shown in Table 2 below, while circulating a cooling medium as shown in FIG. 4 or FIG. 5, the evaporation test or the condensation test that reflects the performance of the heat exchanger unit was performed according to a known method. The evaporation capacity (refrigeration capacity) and condensing capacity (heating capacity) of each heat exchanger unit are shown in Fig. 6 and Fig. 7 respectively as the heat exchange amount-former wind speed graph.

[0044] Test

[0045] In Figure 6, the relationship between the evaporation capacity of the heat exchanger constructed us...

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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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