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Double-sided coil pipe enamel process and double-sided coil-pipe

A process method and enamel technology, applied in the field of coil surface coating, to achieve the effect of firm bonding, prolonging service life, and being conducive to corrosion resistance and scale prevention

Active Publication Date: 2007-09-05
A O SMITH CHINA WATER HEATER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps create better ways for coolers used in industrial processes without being affected or losing their effectiveness due to rustiness caused from water droplets hitting them overtime during use. By doing this it provides cost savings compared to other technologies like plasma coatings and laser welding techniques.

Problems solved by technology

This patented problem addressed by this patents relates to improving the quality of an insulating layer on smaller diameter metal wires used in electric power transmission systems that are prone to rust or damage caused by external factors such as rainwater. Current methods involve applying two layers - either separately applied at different times over each other (two sides) or simultanously onto both surfaces before heat treatment. However, these techniques can be challenged because they often lead to uneven coverage between the inside walls of the wire loops being treated.

Method used

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  • Double-sided coil pipe enamel process and double-sided coil-pipe
  • Double-sided coil pipe enamel process and double-sided coil-pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The double-sided enamel coil of this embodiment is shown in Figure 1. The steel coil body 1 is composed of a low-carbon seamless steel pipe, two reinforcing ribs welded and fixed on both sides of the steel coil and lifting lugs at both ends of the reinforcing ribs. It is used for hanging during sintering in the furnace, which can prevent deformation and facilitate enamel coating. The low-carbon seamless steel coil has a total length of 16m. It can be seen from FIG. 2 that the inner and outer walls of the steel coil pipe body 1 coated with enamel have enamel layers 2 and 3 respectively. The thickness of the outer enamel layer 2 of the steel pipe is between 0.18-0.36mm; the thickness of the inner enamel layer is between 0.05-0.15mm. The above thickness can not only ensure the anti-corrosion and anti-scaling performance, but also help to ensure the quality of coating.

[0025] The entire surface coating process is:

[0026] 1) Clean the inner surface - use an acid-resis...

Embodiment 2

[0036] The basic situation of this embodiment is the same as that of Embodiment 1. The difference is that the metal substrate of the coil is thick-walled stainless steel with a total length of 8m.

[0037] Therefore, the enamel coating and sintering of the inner tube are only performed once, and the sintering temperature is controlled at 900°C-1100°C. Experiments show that the final surface coating effect is basically the same as that of Example 1.

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Abstract

A process for small-diameter coil pipe double-sided enamel is carried out by cleaning internal surface, grouting for inner pipe, enamel sintering for inner pipe, cleaning external surface, coating enamel onto external surface, enamel sintering for external pipe and forming coil pipes with sintered enamel coatings on internal and external surfaces. The enamel layer is compact, metal pipe substrates are firm. It has long life and excellent anti-scale function.

Description

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Claims

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Application Information

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Owner A O SMITH CHINA WATER HEATER CO LTD
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