Dry burning prevention control method for liquid heater

Abstract

The invention discloses a dry burning prevention control method for a liquid heater. The dry burning prevention control method comprises the following steps: 1) setting the detection temperature of a detection point; 2) heating by a heater, and stopping heating after reaching a detection temperature; 3) cooling for a duration T, and recording the temperature change value c of the detection point in the T time regularly; and 4) judging whether dry burning occurs or not according to the cooling speed of the detection point. Whether dry burning occurs or not is judged by detecting the response of the temperature during cooling, the detection points can be arranged on the vulnerable part, the temperature of the vulnerable part is directly controlled, the response speed is high, and damage caused by thermal shock can be effectively avoided; meanwhile, due to the fact that the determined temperature is adopted as the set point for starting cooling, the difference of whether liquid exists or not can be more obvious, and the judgment accuracy is improved; and the control mode is suitable for an all-glass kettle body, and through a low-power heating mode, components can be effectively prevented from being damaged.

Description

Technical field[0001]The invention relates to the technical field of heating equipment, and more particularly to a liquid heater anti-drying control method.Background technique[0002]Due to the convenience of electric kettle, health pot, their use is more common in modern families.[0003]Health pot or electric kettle is water through electric heating, with health pot as an example: a base and a pot body mounted on the base, the base is electrically connected to the pot, and heating. Existing common heating methods include heat generating tubes, thick film heating, electromagnetic film heating, and the like.[0004]The liquid heater prevents dryness when heating is a very important issue. If the control is not good, it causes damage to the equipment, and it will lead its fire.[0005]At present, the liquid heating products on the market are to prevent leakage liquid, so that the heat generating body is overheated, and the fire, etc. is set up. At present, the most common method is to use a...

AI Technical Summary

Problems solved by technology

At present, the most commonly used method is to use sudden jump as dry-burning protection. When the temperature exceeds a certain limit, the sudden jump will act and disconnect the power supply; but this method has certain defects, because there is a certain delay in the sudden jump action and The thermal inertia of the heating element makes it difficult to accurately control the protection temperature. This is more prominent for non-metallic bottoms with poor thermal conductivity, such as all-glass health pots, and the device is often damaged before the jump action.

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