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​Classification of Small Thermostats

A small thermostat is simply a temperature control machine, but its function is far from as simple as its name. The scope of application of small thermostats is very wide, and industries such as home appliances and motors need to use it. In order to adapt to various working environments, there are also many types of small thermostats. Next, I will introduce you to several of them.


1. Sudden jump thermostat


The sudden jump thermostat in the types of small thermostats is a new product of the bimetal thermostat. It mainly used as overheat protection for various electric heating products and usually connects in series with thermal fuse. Sudden jump thermostat serves as the primary protection. The thermal fuse acts as a secondary protection when the sudden jump thermostat fails or fails to cause the heating element to overheat, effectively preventing the burning of the heating element and the resulting fire accident.


2. Liquid expansion thermostat


When the temperature of the controlled object changes, the substance (usually liquid) in the temperature-sensing part of the thermostat will expand and contract with heat (volume change), and the bellows connected with the temperature-sensing part will expand or shrink. Based on the lever principle, the switch is driven on and off to achieve the purpose of constant temperature. The liquid 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. The liquid expansion thermostat in the types of thermostat is mainly used for temperature control occasions such as the household appliance industry, electric heating equipment, and refrigeration industry.


3. Pressure thermostat


The pressure type thermostat converts the change of the controlled temperature into the change of the space pressure or volume through a closed temperature bulb and capillary tube filled with a temperature-sensitive working medium. When the temperature setting value is reached, the contact is automatically closed through the elastic element and the fast instantaneous mechanism to achieve the purpose of automatic temperature control. It is composed of a temperature sensing part, a temperature setting main body, a micro switch or an automatic damper for opening and closing. The pressure type thermostat in the thermostat type is suitable for refrigeration appliances (such as refrigerators and freezers, etc.) and heaters.


4. Electronic temperature control


The electronic temperature controller (resistance type) is measured by the resistance temperature sensing method. Generally, platinum wire, copper wire, tungsten wire and thermistor are used as temperature measuring resistors. These resistors have their own advantages and disadvantages. General household air conditioners mostly use thermistor type.


5. Digital thermostat

The digital electronic temperature controller is an accurate temperature detection controller that can digitally quantify the temperature. Digital thermostats generally use NTC thermal sensors or thermocouples as temperature detection elements. Its principle is: the NTC thermal sensors or thermocouples are designed into the corresponding circuits, and the NTC thermal sensors or thermocouples change with temperature changes. Corresponding voltage and current changes will be generated, and then the changed voltage and current will be detected and quantified by the microcontroller, and corresponding control will be done. The digital temperature controller has the characteristics of high accuracy, good sensitivity, intuitiveness, and convenient operation.


As long as you have set the temperature you want, the small thermostat can control the temperature through the control device, so as to achieve the effect you want. Different types of thermostats have different functions, characteristics and scope of application. You can choose the type of thermostat suitable for use according to different needs.