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Improved heat transfer tube with grooved inner surface

An inner surface and outer surface technology used in the field of heat transfer tubes

Inactive Publication Date: 2003-12-24
WOLVERINE TUBE INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the designs take advantage of this void area to improve the heat transfer characteristics of the tube

Method used

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  • Improved heat transfer tube with grooved inner surface
  • Improved heat transfer tube with grooved inner surface
  • Improved heat transfer tube with grooved inner surface

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0053] Similar to prior art patterns, one embodiment of the inner surface pattern of the tube 10 of the present invention is shown in FIGS. The cross-sectional shape of the basic fin 12 can be assumed as Figure 6-11 Any shape disclosed, but preferably a triangular shape with sloped straight sides 14, rounded apex 16, and rounded edge 18 at the junction of straight side 14 and inner surface 20 of tube 10 (see Figure 4 ). Basic fin height H p It can vary depending on the diameter of the tube 10 and the particular application, but is preferably between 0.004-0.02 inches. like image 3 As shown, the base fins 12 may be positioned at a base fin angle Θ relative to the longitudinal axis 22 of the tube 10, the angle being between 0°-90°. The angle θ is preferably between 5°-50°, more preferably between 5°-30°. Finally, the number of elementary fins 12 positioned along the inner surface 20 of the tube 10, and the pitch P of the elementary fins p (determined as the distance mea...

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PUM

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Abstract

The inner surface of the tube (10) has a primary set of fins (12) and an intermediate sets of fins (26) positioned in the areas (24) between the primary fins (12) and at an angle relative to the primary fins (12). In a preferred embodiment of the inner surface tube design, the intermediate fins (26) are positioned relative to the primary fins (12) to result in a grid-like appearance. A first set of rollers creates the primary (12) and intermediate fin (26) designs on at least one side of a board. A second set of rollers may be used to further enhance the performance. After the desired pattern has been transferred onto the board with the rollers, the board is then formed and welded into a tube, so that, at a minimum, the inner surface design of the resulting tube includes the intermediate fins as contemplated by the present invention.

Description

technical field [0001] The present invention relates to a heat transfer tube that can be used in heat exchangers and other components in air conditioners, refrigerators and other similar devices. The present invention more particularly relates to a heat transfer tube having a grooved inner surface along which fins are formed to improve heat transfer performance. Background technique [0002] Heat transfer tubes with grooved inner surfaces were first used as evaporator tubes and condenser tubes in heat exchangers for air conditioners and refrigerators. It is known to provide heat transfer tubes with grooves and alternating fins on their inner surfaces. The grooves and fins cooperate to increase the turbulence of the flowing heat transfer medium, such as refrigerant, conveyed in the tubes. This turbulence will improve heat transfer performance. The grooves and fins also provide additional surface area and capillary action for additional heat exchange. This basic premise ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21C37/15F25B39/00F28F1/40
CPCF28F1/40Y10T29/4935
Inventor 诺尔曼R·克莱文杰P·托尔斯R·纳拉亚纳穆尔蒂
Owner WOLVERINE TUBE INC
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