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Automatic scale cleaning method for electric heating tube in electric water heater

An electric water heater, automatic cleaning technology, applied in the direction of deformation cleaning, combustion cleaning, cleaning heat transfer devices, etc., can solve the problems of shortening the service life of electric heating tubes, wasting resources, burning electric heating tubes, etc., to ensure heat exchange efficiency and prolong use Longevity and resource saving effect

Inactive Publication Date: 2003-11-26
麦广树
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing electric water heater is to place the electric heating tube in the water tank to directly heat the cold water in the water tank. The disadvantage is that the heat exchange efficiency between the electric heating tube and the water in the water tank will be greatly reduced after a period of use, and may even burn the electric heater. The reason is that the impurities in the tap water become scale and accumulate on the surface of the electric heating tube after being heated, and the thermal conductivity of the scale is low. Therefore, when the scale on the surface of the electric heating tube accumulates to a certain extent, it will reduce the heat between the electric heating tube and the water. Exchange efficiency, when the scale is too thick, the electric heating tube burns the heating wire because the internal heat cannot be dissipated in time, which shortens the service life of the electric heating tube and wastes resources
[0003] The electric heating tube in the electric water heater is easy to accumulate scale, which has been a problem since the electric water heater, and people have been looking for a solution to prevent scale accumulation or automatically remove scale; as in the Chinese patent announcement on October 20, 1999 Just disclosed the patent application that announcement number is CN2344711Y, application number is 98221230, is called " electric water heater ", discloses the structure of a kind of typical electric water heater in this patent application, and this electric water heater is to install a magnesium in the water tank Rods are used to prevent the electric heating tube from accumulating scale. The disadvantage is that periodic manual maintenance (replacement of magnesium rods) is required; because the service life of magnesium rods is short, it must be replaced every once in a while, and its service life varies with water quality and specific use. Depending on the time, people cannot know when the magnesium rod needs to be replaced. Even if the "electric water heater power-on working time accumulation timer" disclosed on the Chinese patent announcement CN2387568Y announced on July 12, 2000 cannot be determined when the magnesium rod should be replaced Because the life of the magnesium rod varies with the water quality, and even if the time to replace the magnesium rod can be determined, it must be replaced manually, so the method of using magnesium rods to prevent scale is not ideal

Method used

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  • Automatic scale cleaning method for electric heating tube in electric water heater
  • Automatic scale cleaning method for electric heating tube in electric water heater
  • Automatic scale cleaning method for electric heating tube in electric water heater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A method for automatically removing scale from an electric heating tube in an electric water heater.

[0029] There is a clock in the controller; the controller has a preset time setting value for removing scale at 3 o'clock in the morning on the first day of each quarter every year; when the clock runs to 3 o'clock in the morning on the first day of each quarter, the controller will The following descaling work:

[0030] In the first step, the controller opens the electric control valve 401 on the balance air pipe 4 so that the water tank 1 communicates with the atmosphere, and at the same time controls the two-position three-way electric control valve at the station two (such as figure 1 ), the water in the water tank 1 is discharged through the side hole 603, the water inlet pipe 6 and the drain pipe 7, and when the water level drops to the sensing position of the low water level sensor, the electric heating tube has been exposed to the air in the water...

Embodiment 2

[0034] Embodiment 2: A method for automatically removing scale from an electric heating tube in an electric water heater.

[0035] The controller is equipped with an accumulative timer for the electric water heater; the controller is equipped with a set value when the accumulative working time of the electric water heater reaches 100 days; when the counting value of the timer reaches 100 days, the controller performs the following work of removing scale :

[0036] In the first step, the controller opens the electric control valve 401 on the balance air pipe 4 so that the water tank 1 communicates with the atmosphere, and at the same time controls the two-position three-way electric control valve at the station two (such as figure 1 ), the water in the water tank 1 is discharged through the side hole 603, the water inlet pipe 6 and the drain pipe 7, and when the water level drops to the sensing position of the low water level sensor, the electric heating tube has been exposed to ...

Embodiment 3

[0041] Embodiment 3: A method for automatically removing scale from an electric heating tube in an electric water heater.

[0042] The controller is equipped with an accumulative timer for the electric heating tube of the electric water heater; the controller sets the cumulative working time of the electric heating tube to 100 hours as the set value; when the timer value reaches 100 hours, the controller performs the following steps to remove scale operate:

[0043] Step 1: The controller resets the working accumulation timer of the electric heating tube of the electric water heater;

[0044] In the second step, the controller opens the electric control valve 401 on the balance air pipe 4 to make the water tank 1 communicate with the atmosphere, and simultaneously controls the two-position three-way electric control valve to the station two (such as figure 1 ), the water in the water tank 1 is discharged through the side hole 603, the water inlet pipe 6 and the drain pipe 7, ...

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Abstract

The automatic descaling method for electric heating tube in electric water heater features that descaling condition is set in the controller, and when the condition is fulfilled the controller completes the following steps: draining water from the electric water heater to expose the electric heating tube in air; powering the electric heating tube instantaneously to raise the temperature of the scale on the surface of the electric heating tube; opening the water inlet valve to make cold water shower to the scale; shutting down the power source to make the electric water heater return to ready state after the water level raises to certain value.

Description

Technical field: [0001] The invention relates to a scale removal method, in particular to an automatic scale removal method for an electric heating tube in an electric water heater. Background technique: [0002] The existing electric water heater is to place the electric heating tube in the water tank to directly heat the cold water in the water tank. The disadvantage is that the heat exchange efficiency between the electric heating tube and the water in the water tank will be greatly reduced after a period of use, and may even burn the electric heater. The reason is that the impurities in the tap water become scale and accumulate on the surface of the electric heating tube after being heated, and the thermal conductivity of the scale is low. Therefore, when the scale on the surface of the electric heating tube accumulates to a certain extent, it will reduce the heat between the electric heating tube and the water. Exchange efficiency, when the scale is too thick, the elect...

Claims

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Application Information

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IPC IPC(8): F28G5/00F28G11/00
Inventor 麦广树
Owner 麦广树
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