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High finned heat-exchange tube and processing method thereof

A technology for heat exchange tubes and processing methods, which is applied in the field of processing high-fin heat exchange tubes and high-fin heat exchange tubes. Thermal performance and other issues, to achieve the effect of eliminating contact thermal resistance, simple method, and improved heat transfer coefficient

Active Publication Date: 2007-08-08
JIANGSU CUILONG PRECISION COPPER TUBE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] As known in the industry, only high-finned heat exchange tubes that meet the fin height of 5-15mm and reflect that the overall shape of the fins are petal-shaped or wavy are the options for obtaining the ultimate external heat exchange area. It is not and should not simply lengthen the height of the fins blindly, because the lengthy straight fins will cause the fluid to flow through the surface of the fins for a long distance, and the velocity and temperature boundary layer will be thicker, which will affect heat transfer. performance, in the above-mentioned published documents, except for the structure recommended by US2667337, all other patented technical solutions have this drawback
Yet, because US2667337 is welded on the metal circular tube with the helical fin that makes separately, therefore there are the above-mentioned three deficiencies, thereby constituted a big shortcoming on the structure

Method used

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  • High finned heat-exchange tube and processing method thereof
  • High finned heat-exchange tube and processing method thereof
  • High finned heat-exchange tube and processing method thereof

Examples

Experimental program
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Embodiment 1

[0037] The present invention will be further described below in conjunction with the given drawings and specific embodiments to facilitate understanding of the present invention, but does not constitute a limitation to the present invention.

[0038] A) Select a heat-treated pipe body 1 with a grade of TP2, a tensile strength of 230-240MPa, an elongation ≥ 40%, a HV value between 40-50, and a grain size ≥ 0.02mm. The outer surface of the pipe body 1 The diameter is 19mm and the inner diameter is 16.8mm;

[0039] B) Equipped with three sets of combined molds 8 shown in Figure 5, which are composed of the slotting die 5 shown in Figure 7, the straight fin forming die 6 and the corrugated fin forming die 7, the slotting die 5 is like a common cutting Sheets or cutting blades are used to cut grooves on the outer wall of the pipe body 1. Usually, each group of slotting dies 5 has multiple or multiple handles. In this embodiment, 26 dies are selected. Each group of straight fin form...

Embodiment 2

[0044] When the pipe body 1 described in step C) is placed on the three-roll rolling mill, an inner mold is set in the pipe body 1, the inner mold is a smooth cylindrical section, and the grooved mold 5 and the straight fin forming mold 6 are external Under the action of pulling the fins 2 outward, the inner wall of the tube body 1 forms a relatively shallow wavy shape extending toward the axis of the tube body 1 at a position corresponding to the outer fins 2 , as shown in FIG. 7 . The groove 4, the pipe body 1 with the groove 4, is more suitable for the fluid in the pipe that is relatively dirty and easily fouled or the flow resistance loss of the fluid in the pipe is not allowed to be too large. All the other are the same as the description of embodiment 1.

Embodiment 3

[0046] The height of the processed outer tooth sheet 2 is 5mm, the wing pitch is 2mm, the number of waves on the circumference is 3, the helix angle α formed by the inner fin 3 and the center line of the pipe body is 20°, and the inner fin 3 Take a high-finned heat exchange tube with a height of 0.2 mm as an example.

[0047] Only take the pipe body 1 of step A) as having an outer diameter of 19 mm and a wall thickness of 1.1 mm;

[0048] Only the thickness of the slotting die 5 in step B) is taken as 1.5 mm, and the size of the knife tip is gradually increased by 0.1 mm from 0.2 mm. There are 14 slotting dies 5 in each group, and the number of straight fin forming dies 6 in each group The thickness of each pair of straight fin forming dies 6 is 1.6mm, and each set of corrugated fin forming dies 7 is one, and the paired concave and flanges on the first and second die halves 7a, 7b The quantity is 6 pairs;

[0049] Adjust the feed distance of the three-roll rolling mill in st...

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Abstract

A high-fin heat exchange tube comprises a tube and external fins combined on the outer wall of tube. The external fins are extended along the axle of tube in screw shape on the outer wall of tube. The fins are shifted to two sides to form wave shape. The invention has the advantages that the outer wall of tube is formed by wave high fins, to strengthen the heat exchange and improve 10% of thermal conductivity. Compared with prior coiled-fin tube, the invention can eliminate the contact thermal resistance between the tube and fin root, the wave shape of high-fin is decided by the fins and the fin mould, to induce the airflow towards to the tube and backwards the tube along the radius of tube, with high horizontal interference on the airflow. The invention only arranges relative wave fin mould based on present technique.

Description

technical field [0001] The invention relates to a high-fin heat exchange tube, which is applied to an air cooler or radiator as an enhanced heat exchange component such as air-air, air-water, and air-oil, and also relates to the high-fin heat exchange tube The processing method belongs to the field of heat exchange components and manufacturing technology. Background technique [0002] High-finned tubes usually refer to finned tubes with a fin height of 5-15mm, which are generally rolled from single metal tubes or composite metal tubes such as aluminum tubes, steel-aluminum tubes, steel-stainless steel tubes, etc. The ribbed area is 5-12 times that of bare tubes, mainly used to enhance the heat transfer on the gas side. Generally, the total heat transfer coefficient is 50-100% higher than that of bare tubes. It is widely used in food drying, pharmaceutical, chemical, petrochemical, air cooling and other industries. [0003] Heat exchange tubes used in the above-mentioned fie...

Claims

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Application Information

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IPC IPC(8): F28F1/36F28F1/42B21D53/06B21D37/10
Inventor 陆明华张春明罗行
Owner JIANGSU CUILONG PRECISION COPPER TUBE CORP
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