Internal thread heat-transferring pipe
A technology of heat transfer tubes and internal threads, which is applied in the field of heat transfer tubes, can solve the problems of increasing flow resistance, and achieve the effect of strengthening condensation and boiling heat transfer, reducing included angle, and coordinating velocity field and temperature gradient field
Inactive Publication Date: 2005-05-04
XI AN JIAOTONG UNIV
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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.
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[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 , the present invention is provided with 40 to 70 long helical main teeth 1 and short helical main teeth 1' of different heights that are periodically and evenly distributed on the inner surface of the heat transfer tube, and the rib height Ht of the long helical main teeth 1 is 0.15 to 0.3 mm, and the ratio Ht / Hb of the height of the long helical main tooth 1 to the short helical main tooth 1′ is 1:0.4~0.95, for the φ9.52mm heat transfer tube commonly used in room air conditioners, the tooth height is preferably 0.20~0.27 mm, the number of teeth of the helical main teeth is preferably 50-70. For the φ7mm heat transfer tubes commonly used in room air conditioners, the tooth height is preferably 0.10-0.24mm, and the number of teeth of the helical main teeth is preferably 40-60. The top of t...
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The invention provides a heat transfer tube with internal threads, which is used in condensers and evaporators of refrigeration and air conditioning equipment using single and mixed refrigerants. Helical main teeth with different heights are uniformly arranged on the inner surface of the heat transfer tube, wherein the top of the higher helical main teeth is processed with tiny protrusions. The length of the protrusion is longer than its width, and the length of the protrusion is equal to the length of the groove formed on the broken helical main tooth. Since the helical main teeth in the heat transfer tube of the present invention adopt the arrangement of high teeth and low teeth, it is beneficial to strengthen the disturbance of boiling and condensation heat transfer, so that the thermal boundary layer can be effectively thinned, and the velocity vector and temperature The included angle of the gradient vector decreases, which makes the velocity field and the temperature gradient field more harmonious, thereby enhancing the condensation and boiling heat transfer. The heat transfer performance of phase-change heat in refrigeration and air-conditioning equipment is improved, and the flow resistance in the tube is reduced, thereby reducing the volume of refrigeration and air-conditioning equipment and reducing product costs.
Description
1. Technical field [0001] The invention relates to a heat transfer tube, in particular to an internal thread heat transfer tube used in condensers and evaporators in refrigeration and air-conditioning equipment with single and mixed refrigerants as working substances. 2. Background technology [0002] At present, the condensation and evaporation heat transfer tubes in refrigerators and air conditioners using a single refrigerant, such as HCFC-22, and mixed refrigerants, such as R407c and R410A, mostly use heat transfer tubes with a single spiral groove on the inner surface Tube, this kind of heat transfer tube with a single spiral groove on the inner surface (hereinafter referred to as two-dimensional micro-finned tube), has a good heat transfer performance compared to the plain tube (US Patent No. 4044797). Since then, many documents and patents have optimized the combination of several characteristic parameters of the tooth profile in the tube (US Patent No. 4658892). Wit...
Claims
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IPC IPC(8): F28F1/40
Inventor 陶文铨刘星唐桂华唐上朝
Owner XI AN JIAOTONG UNIV