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
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[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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