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Enamel coating heating tube and manufacture for electric water heater

An electric water heater and a manufacturing method technology, applied to water heaters, ohmic resistance heating parts, heating elements, etc., can solve the problems of destroying the enamel layer, damaging the insulating material of the insulating terminal, coating the enamel on the electric heating pipe, etc. Layer dense, extended protection time, strong bonding effect

Active Publication Date: 2005-07-27
A O SMITH CHINA WATER HEATER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the structure of the electric heating pipe cannot be coated with enamel by conventional processes
Because, if the enamel is applied after the electric heating tube is formed, the high temperature in the sintering process will inevitably damage the insulating material in the insulating terminal; and if the enamel is applied first, and then the electric heating wire and the insulating terminal in the tube are installed, the electric heating tube will be damaged later. In the process of shrinking and bending, the enamel layer is bound to be damaged due to deformation

Method used

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  • Enamel coating heating tube and manufacture for electric water heater
  • Enamel coating heating tube and manufacture for electric water heater

Examples

Experimental program
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Effect test

Embodiment 1

[0025] This embodiment is an electric water heater enamel coating (also known as Jingui) heating tube with a power of 2 kilowatts, which is manufactured by the following steps:

[0026] 1) Put the heating wire into the metal tube, and fill it with quartz sand insulating and heat-conducting material;

[0027] 2) Install insulating terminals at both ends to isolate the heating wire from the metal tube shell;

[0028] 3)' lengthen and reduce the diameter of the metal pipe;

[0029] 3) Bend the assembled metal tube into a U shape;

[0030] 4) Dip the outer surface of the metal tube into the enamel slurry to coat, and the coating thickness is controlled at 0.4-0.6mm;

[0031] 5) Electric heating, according to the enamel sintering process, the electric heating temperature is controlled at 800-900°C, and the holding time is 10 minutes (usually controlled at 8-12 minutes), so that the enamel paint coated on the outer surface of the metal tube is sintered into a dense and solid ename...

Embodiment 2

[0035] This embodiment is an enamel-coated heating tube for an electric water heater of 1.5 kilowatts, and its manufacturing method is basically the same as that of the embodiment, except that:

[0036] 1), the metal tube shell 3 is bent into an L shape, and the insulating terminal 1 is firmly connected with the bowl-shaped flange joint 2 for installation;

[0037] 2), the enamel paint is applied to the surface of the L-shaped metal tube shell 3 by spraying;

[0038] 3) Due to its low electric power, it is necessary to take heat preservation measures when heating with electricity.

[0039] Its use effect is the same as that of Embodiment 1, and will not be described in detail.

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Abstract

The enamel-coated heating pipe for electric water heater is shaped into bending state. The heating wire isolating from outside casing of metal pipe by insulated terminal is installed in the pipe. The insulating heat-conductance material is filled into the space between the heating wire and outside casing of metal pipe. The key point of the invention is: after the enamel paint is coated on external surface of metal pipe, the temperature of electric heating and holding time are controlled in accordance with enamel agglomeration technology.

Description

technical field [0001] The invention relates to a heating device for an electric water heater, and also relates to a manufacturing method of the heating device, which belongs to the technical field of household appliances. Background technique [0002] With the continuous improvement of people's quality of life, electric water heaters have entered thousands of households and become one of the most commonly used household appliances. The heating device is usually a curved electric heating tube. The tube is equipped with a heating wire isolated from the metal tube shell through an insulating terminal. The space between the heating wire and the metal tube shell is filled with insulating heat-conducting materials such as magnesia quartz sand. Electric water heaters are very convenient to use, but the descaling and anticorrosion of electric heating devices is always a major technical problem. [0003] In order to solve this problem, people have been trying to find new coating ma...

Claims

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Application Information

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IPC IPC(8): F24H1/00H05B3/06H05B3/50H05B3/52
Inventor 丁威邱步王建宝万华新鞠平
Owner A O SMITH CHINA WATER HEATER CO LTD
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