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Thermostat (Thermostat), according to the temperature change of the working environment, physical deformation occurs inside the switch, resulting in some special effects, a series of automatic control components that produce on or off actions, or electronic components at different temperatures, Different principles of the working state are used to provide temperature data to the circuit for the circuit to collect temperature data. According to the manufacturing principle of the thermostat, the thermostat is divided into:
1. Kick-type thermostat: The models of various Knock-type thermostats are collectively referred to as KSD, such as KSD301, KSD302, etc. This thermostat is a new type of bimetal thermostat, mainly used as a variety of electric heaters When the product has overheat protection, it is usually used in series with the thermal fuse, and the jump thermostat is used as the primary protection. The thermal fuse acts as a secondary protection when the sudden jump thermostat fails or fails, causing the electric heating element to overheat, effectively preventing the electric heating element from being burned out and the resulting fire accident. [1]
2. expansion thermostat: It is a physical phenomenon (volume change) that causes the material (usually liquid) in the temperature sensing part of the thermostat to have corresponding thermal expansion and contraction when the temperature of the controlled object changes. The bellows with the warm parts connected together expands or contracts. Based on the lever principle, it drives the switch on and off to achieve the purpose of constant temperature. The expansion thermostat has the characteristics of accurate temperature control, stability and reliability, small temperature difference between start and stop, large temperature control adjustment range, and large overload current. expansion thermostats are mainly used in temperature control occasions such as home appliance industry, electric heating equipment, and refrigeration industry.
3. Pressure-type thermostat, the thermostat changes the change of the controlled temperature into the change of the space pressure or volume through the closed temperature bulb and capillary filled with the temperature-sensing working medium. When the temperature set value is reached, the The elastic element and the quick momentary mechanism automatically close the contacts to achieve the purpose of automatic temperature control. It consists of three parts: a temperature sensing part, a temperature setting main body, a microswitch or an automatic damper that performs opening and closing. Pressure thermostats are suitable for refrigeration appliances (such as refrigerators, freezers, etc.) and heaters.
Fourth, electronic temperature controller, electronic temperature controller (resistance type) is measured by the method of resistance temperature sensing. Generally, platinum wire, copper wire, tungsten wire and thermistor are used as temperature measuring resistors. Each has its pros and cons. Most household air conditioners use thermistor type.