The thermostat, according to the temperature change of the working environment, physically deforms inside the switch, which produces some special effects, and generates a series of automatic control elements that are turned on or off, or electronic components at different temperatures and working conditions. Different principles 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: I. Jump-type thermostat: This type of thermostat is a new type of bimetal temperature controller. It is mainly used as a series of thermal fuses when various electric heating products have overheating protection. As a level of protection. The thermal fuse acts as a secondary protection for the overheating of the heating element when the sudden temperature controller fails or fails, which effectively prevents the heating element from burning out and the fire accident caused by it.
Second, the liquid expansion type thermostat: when the temperature of the controlled object changes, the material (usually a liquid) in the temperature sensing part of the thermostat will generate the corresponding physical phenomenon of thermal expansion and contraction (volume change). The capsules connected with the warm part expand or contract. Based on the lever principle, the switch is used to switch on and off to achieve the purpose of constant temperature. The liquid expansion temperature controller has the performance characteristics of accurate temperature control, stable and reliable, small temperature difference between start and stop, large temperature control adjustment range, and large overload current. Liquid expansion thermostat is mainly used in temperature control occasions such as home appliance industry, electric heating equipment and refrigeration industry.
Third, the pressure type thermostat, the thermostat changes the temperature of the controlled temperature into a change in space pressure or volume through a closed inner temperature-sensing temperature-sensing temperature package and capillary. The elastic element and fast instantaneous mechanism can automatically close the contacts to achieve the purpose of automatic temperature control. It consists of a temperature sensing part, a temperature setting main body part, a micro switch that performs opening and closing, or an automatic damper. Pressure type thermostat is suitable for occasions such as refrigeration appliances (such as refrigerators and freezers) and heaters.
Fourth, electronic temperature controller, electronic temperature controller (resistive type) is measured by resistance temperature sensing method, generally using platinum wire, copper wire, tungsten wire and thermistor as temperature measuring resistance, these resistance Each has its own points. Most home air conditioners use thermistors.
Steam Working principle: steam pressure The action of the bellows acts on the spring. The elastic force of the spring is controlled by the knob on the control board. The capillary tube is placed at the air outlet of the indoor air intake of the air conditioner and responds to the temperature of the indoor return air. When the room temperature rises to the set temperature, the temperature-sensing agent gas in the capillary tube and the bellows expands, which makes the bellows extend and overcome the elastic force of the spring to switch on the switch contacts. At this time, the compressor runs and the system cools until the room temperature When the temperature drops to the set temperature, the temperature of the temperature-sensing bag shrinks, the bellows shrinks and moves together with the spring, and the switch is placed in the off position to cut off the motor circuit of the compressor. Repeat this action to achieve the purpose of controlling the room temperature.
Electronic Electronic temperature controller (resistive type) is measured by resistance temperature sensing method. Generally, platinum wire, copper wire, tungsten wire and semiconductor (thermistor, etc.) are used as temperature measuring resistors. These resistors have their own advantages and disadvantages . The sensors of home air conditioners are mostly thermistor type. Suitable for floor heating control.