Electric water heater water boiling and anti-dry-heating control method

The technology of an electric water heater and a control method, which is applied to fluid heaters, lighting and heating equipment, etc., can solve the problems of increasing the cost of heating elements, accelerated oxidation of the surface of the heating plate, and high production costs, and achieve the effect of eliminating dry burning

Active Publication Date: 2014-03-26
深圳市北鼎晶辉科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dry burning causes adverse phenomena such as accelerated oxidation of the surface of the heating plate to occur
The water boiling and anti-dry technology of some electric water heaters such as electric water heaters, electric kettles, electric steamers, and electric saucepans have deficiencies: 1. There must be a temperature sensor or liquid level detection protruding from the surface of the heating element point, its biggest disadvantage is that it is necessary to make holes on the heating element, and make a special temperature sensor with a metal shell, and then strictly seal this temperature sensor on the heating element; 2. When the anti-dry function works, the wat

Method used

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  • Electric water heater water boiling and anti-dry-heating control method

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Embodiment 1

[0035]Embodiment 1: An electronic kettle is equipped with a control circuit board with a microprocessor chip as the core component. Two temperature sensors are installed on the back side of the chassis of the heating plate, and one of them is installed on the heating plate. The edge of the plate (it can also be installed in the center of the heating plate), this point is in the early stage of the end of water boiling, the temperature is lower, and the other is installed near the middle of the heating plate heating wire (but not close to it), this point is at the end of the water In the early stage of boiling, the temperature is higher. (in order to reduce the influence of kettle inclination, two temperature sensors are preferably contained on the same diameter position of the garden type heating plate). After power-on and initialization, the microprocessor detects the temperature of two points through the temperature sensor, and can calculate the average value per second after...

Embodiment 2

[0036] Embodiment two: an electronic water kettle is equipped with a control circuit board with a microprocessor as the core component, a temperature sensor is contained in the middle part of the heating wire near the heating plate (but not next to it), and another temperature sensor is placed in the water. Compared with the first embodiment, this embodiment only has a different placement position of a temperature sensor, and the judging state and control process and method are the same as the first embodiment.

Embodiment 3

[0037] Embodiment 3: The electric steamer of the pan bottom structure, the bottom of the pan and the contact part of the water are flat, unlike some steamers with protrusions on the bottom (the protrusions are embedded with temperature sensors to detect dry burning), nor are they like some There is a temperature sensor at the bottom of the electric water heater and the like that is in contact with the water. The temperature sensor of this electric steamer is placed on the backside of the bottom of the heating plate, one of which is installed near the opening of the heating wire near the edge of the heating plate. This point is in the early stage of water boiling, and the temperature is low, and the other is installed near the middle of the heating wire of the heating plate. (But not in contact with the heating wire), this point is at the early stage of water boiling, and the temperature is higher. Likewise, a control circuit board with a microprocessor chip as the core compone...

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Abstract

The invention provides an electric water heater water boiling and anti-dry-heating control method, and relates to an electric water heater water boiling and dry-heating judgment and control method. The method includes the following steps that (A) a control circuit board with a micro processor chip as a core is arranged in an electric water heater; (B) two temperature sensors for detecting water temperature are placed in the electric water heater, one is far away from a heating tube, and the other one is near the heating tube, but is not contact with the heating tube; (C) temperatures of two measurement points are detected in real time; (D) the temperature difference of the two measurement points is calculated through a micro processor; (E) the temperature difference is compared with a previous temperature difference to obtain a temperature difference development trend; (F) the temperature difference development trend is judged, if the temperature difference development trend is rising, lowering and mild changing, it is indicated that water is boiling, and accordingly a heating power supply is turned off or a start of needed boiling time is formed, and if the temperature difference development trend is lowering, mild changing and rising, it is indicated that dry heating is to occur, and accordingly the heating supply can be turned off or water is supplemented. In the heating process of water, the dry-heating phenomenon can be truly eliminated.

Description

technical field [0001] The invention relates to a method for judging and controlling water boiling and dry burning of an electric water heater. Background technique [0002] At present, the methods commonly used in the industry to judge water boiling are as follows: 1. In mechanical electric kettles, water vapor is generated after the water boils to push the steam switch; 2. In electronic electric water heaters, the temperature sensor senses the boiling point temperature. Third, in the electronic electric water heater, the temperature change rate of the current temperature at a certain point related to the water temperature compared with the previous temperature is used to judge the boiling of the water. The anti-dry methods commonly used in the industry include: 1. Place a switch composed of bimetallic strips at the bottom of the heating pan, heat in an anhydrous state, the temperature at the bottom of the heating pan rises sharply, and the bimetallic strip switches actuate...

Claims

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Application Information

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IPC IPC(8): F24H9/20
Inventor 张默晗王耀伦罗雁冰
Owner 深圳市北鼎晶辉科技有限公司
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