Heat transfer pipe with internal threads

A heat transfer tube and internal thread technology, which is applied to the field of internal thread heat transfer tubes, can solve the problems of low heat transfer performance with thin and high teeth.

Active Publication Date: 2008-01-30
GOLDEN DRAGON PRECISE COPPER TUBE GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for the evaporator tube, the heat transfer performance of the thin and tall teeth is not very prominent

Method used

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  • Heat transfer pipe with internal threads

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Embodiment Construction

[0005] The present invention will be described in detail in conjunction with the above-mentioned drawings. The inner surface of the heat transfer tube is provided with evenly distributed helical teeth 1 of the same height. The cross section of the tooth is a Y-shaped tooth, and the two sides of the tooth are concave arcs. The top of the tooth is two convex arcs (see Figure 1); another structure of the Y-shaped tooth is a concave fold line on both sides of the tooth, and the tooth top is a concave fold line (see Figure 2); the cavity The width γ of the mouth is 0.01-0.25 mm, and the maximum width of the cavity is larger than γ (see Figures 1 and 2). The tooth height Hf1 is 0.06-0.3mm, Hf2 is 0.06-0.3mm, Hf1 and Hf2 can be equal or unequal, the bottom thickness TW of the tooth is 0.15-0.6mm, and the addendum angle α is 15°-180°. For the φ4-7mm heat transfer tube of the room air conditioner, the number of circumferential teeth of the helical teeth is 30-150, the tooth height is 0...

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Abstract

The invention relates to an inner screw heat transmission pipe, belonging to the heat transmission element. The invention is purposed to realize high heat transmission efficiency in condensation and high heat transmission efficiency in evaporation. The invention comprises: the inner surface of said pipe has screw teeth whose sections are in Y-shape and the nearby two teeth have an open chamber; the heights of two side wall of tooth are different or same while the biggest width between nearby two chambers is bigger than the width of chamber; the screw angle beta of screw tooth ranges between 0-30 degrees; The number of screw teeth of inner surface ranges from 30-200; and the width between nearby chamber opens ranges from 0.01-0.25mm. The invention can apply cold-warm indoor air conditioner.

Description

technical field [0001] The invention relates to a heat transfer element, in particular to an internal thread heat transfer tube for refrigeration and air conditioning equipment. Background technique [0002] Currently used single refrigerant (such as R22), and heat transfer tubes in refrigeration and air conditioners with mixed refrigerants (such as R407C or R410A), most of them use internally threaded tubes with simple helical teeth on the inner surface. In order to further improve the heat transfer coefficient, at this stage, various manufacturers are developing the teeth of this internally threaded pipe in the direction of thinner and taller. Through a large amount of experimental data and video recording of the experimental process, it is found that when the thin tall teeth are used as condenser tubes, compared with ordinary teeth, the heat transfer coefficient of the inner surface is indeed greatly improved. This is in line with the GREGORIG effect of the condensation-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F1/40F25B39/04
Inventor 王凯程骥王学印杜艳德冯振国
Owner GOLDEN DRAGON PRECISE COPPER TUBE GROUP
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