Control method and control system capable of preventing liquid heating equipment from parching

Abstract

The invention provides a control method and a control system, which can continuously detect temperature change in liquid heating equipment and calculate out temperature increasing rate. The temperature increasing rate is used for comparing with a set threshold value to judge whether parching happens. In order to avoid mistaken errors caused by factors of water level fluctuation and the like, the control method and the control system can collect data continuously for three times to judge whether parching happens. Simultaneously, light-emitting diode display lamps are utilized to give fault alarm to users to remind users of examining a water heater and a pipeline. The control method and the control system can judge whether parching happens according to speed of temperature rise in the liquid heating equipment to protect electrical heating, prolong service life of equipment, provide safety guarantee for using the liquid heating equipment and prevent safety accidents from happening.

Description

technical field [0001] The present invention relates to a control method and system for liquid heating equipment, and more specifically, to a control method and system for preventing dry heating of liquid heating equipment. Background technique [0002] With the development of society, the application of liquid heating equipment is becoming more and more common. However, when liquid heating equipment such as a water heater overheats, it can be dangerous, especially if the liquid boils dry. The heat accumulation may cause damage to the equipment, and even cause a fire or cause burns to the user. In the current prior art, for electric heating in water heaters or other hot water equipment, a thermostat is usually connected in series to the main circuit of the control power supply. When the water temperature reaches or exceeds the protection value, the thermostat is disconnected to cut off the power supply. If the electric heating is dry-burned, only when the dry-burning temper...

AI Technical Summary

Problems solved by technology

[0004] 1. When there is no water or insufficient water in the system, the electric heating cannot be judged normally and dry burning occurs, which will affect the life of the electric heating, and more importantly, the safety problem cannot be guaranteed;

[0005] 2. If the contacts of the thermostat are stuck due to excessive current, the electric heating will always be energized and work, which may eventually cause a safety accident due to excessive temperature;

[0006] 3. The user cannot be notified when a fault such as dry burning occurs, and the fault is not discovered and resolved in time, which poses a threat to the safety of the user;

[0007] 4. The existing method of detecting temperature through sensors is to protect immediately as soon as the temperature rise exceeds the limit, which cannot avoid the influence of sensor detection error or pressure-induced water level fluctuations, resulting in frequent shutdown of electric heating and affecting use

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