Thermostat, the full name of temperature controller, also called temperature control switch, temperature protector, is divided into two types: mechanical type and electronic type. It is mainly based on the temperature change of the working environment. Physical deformation occurs inside the switch, thereby Some special effects are produced, and the on or off action is generated – a series of automatic control components, or different principles of electronic components under different temperatures and working states to provide temperature data to the circuit for the circuit to collect temperature data. Thermostat control principle – Introduction to the working principle of the thermostat The temperature controller is a kind of automatic adjustment device realized by the principle of thermal expansion and contraction of temperature-sensing liquid and incompressibility of liquid, which can make the temperature in the box within the specified range. internal changes. It transmits the temperature to the temperature controller through the temperature protector, and the temperature controller issues switch commands to control the operation of the equipment to achieve the ideal temperature and energy saving effect.
Thermostats have a very wide range of applications, and are used in many products such as home appliances, motors, refrigeration or heating according to different types of thermostats.
There are generally two control methods; one is controlled by the temperature change of the object to be cooled, mostly using a vapor pressure temperature controller, and the other is controlled by the temperature difference change of the object to be cooled, mostly using an electronic temperature controller. controller.
It adopts fuzzy control technology such as PID control, P (Proportional) proportional + I (Integral) integral + D (Differential) differential control.
Thermostats are widely used in various home appliances, such as refrigerators, water dispensers, water heaters, coffee pots, etc. The quality of the thermostat directly affects the safety, performance and life of the whole machine, and is a very critical component. Among the many technical indicators of thermostats, life is one of the most important technical indicators to measure thermostat products. The home appliance standard stipulates that the life of the thermostat is at least 10,000 times, and some home appliances, such as the thermostat that controls the motor-compressor in refrigerator products, and some thermostats in the liquid-filled radiator require at least 100,000 times. The standard GB14536.10-2008/IEC60730-2-9:2004 corresponding to household thermostats makes detailed provisions on the life test of thermostats
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