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Internal thread heat-transferring pipe

A heat transfer tube and internal thread technology, applied in the field of heat transfer tubes, can solve problems such as increasing flow resistance, and achieve the effects of strengthening condensation and boiling heat transfer, reducing included angle, and strengthening disturbance

Inactive Publication Date: 2003-03-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the currently commonly used three-dimensional micro-finned tubes improve the heat transfer performance, they inevitably have the negative effect of increasing the flow resistance, which offsets the benefits of using high-efficiency heat transfer tubes to a certain extent.

Method used

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Embodiment Construction

[0010] The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0011] See figure 1 In the present invention, 40 to 70 spiral main teeth 1 and spiral main teeth 1'of different heights are arranged periodically and uniformly on the inner surface of the heat transfer tube. The rib height Ht of the spiral main tooth 1 is 0.15 to 0.3 mm, and The height ratio Ht / Hb of the spiral main tooth 1 to the spiral main tooth 1'is 1:0.4~0.95. For the 9.52mm heat transfer tube commonly used in room air conditioners, the tooth height is preferably 0.20~0.27mm. The spiral main tooth The number of teeth is preferably 50 to 70. For the 7mm heat transfer tube commonly used in room air conditioners, the tooth height is preferably 0.10 to 0.24 mm, and the number of teeth of the spiral main tooth is preferably 40 to 60. The top end is provided with uniformly arranged grooves 3. The length of the gro...

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Abstract

The present invention provides one kind of internal thread heat-transferring pipe for use in the condenser and evaporator of refrigerating equipment and air conditioning equipment with single or mixed refrigerant. In the inner surface of the heat-transferring pipe, there are homogeneously arranged main screw teeth in different height and the relatively higher main screw teeth have miniature protuberance formed in the top. The alternate arrangement of the main screw teeth in different height can reinforce the disturbance to boiling and condensing heat exchange, reduce the heat boundary layer, reduce the angle between the speed vector and the temperature gradient vector, coordinate the speed field and temperature field, strengthen the boiling and condensing heat exchange and raise heat transferring efficiency.

Description

1. Technical Field [0001] The invention relates to a heat transfer tube, in particular to an internally threaded heat transfer tube for condensers and evaporators in refrigeration and air-conditioning equipment using single and mixed refrigerants as working materials. 2. Background technology [0002] At present, single refrigerants, such as HCFC-22, and mixed refrigerants, such as R407c and R410A, are used for condensing and evaporating heat transfer tubes in refrigerators and air conditioners. Most of them use heat transfer tubes with a single spiral groove on the inner surface. The tube, this kind of heat transfer tube with a single spiral groove on its inner surface (hereinafter referred to as a two-dimensional micro-fin tube), has better heat transfer performance than a light tube (US Patent No. 4044797). Since then, many documents and patents have optimized the combination of several characteristic parameters of the internal tooth profile of the tube (U.S. Patent No. 4,658,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F1/40
Inventor 陶文铨刘星唐桂华唐上朝
Owner XI AN JIAOTONG UNIV
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