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Temperature switch working principle and
The temperature switch is a switch that determines the on/off according to the te
Three control states of the temperature c
First, the vapor pressure type temperature control switch The action of the bello

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Three control states of the temperature control switch
Release Time:2019-03-08    Clicks:   
First, the vapor pressure type temperature control switch
    The action of the bellows acts on the spring. The spring force of the spring is controlled by the knob on the control panel. The capillary is placed at the air inlet of the air in the air conditioner to react to the temperature of the indoor return air. When the room temperature rises to the set temperature, the temperature sensor gas in the capillary tube and the bellows expands, the bellows is extended and the switch contact is turned on against the spring force of the spring. At this time, the compressor is running, the system is cooled, and the temperature is cooled. When it is lowered to the set temperature, the temperature-inducing gas shrinks, the bellows shrinks together with the spring, and the switch is placed in the off position to cut off the motor circuit of the compressor. This is repeated to achieve the purpose of controlling the temperature of the room.
Second, electronic temperature control switch
    The electronic temperature controller (resistive type) is measured by the method of resistance temperature sensing. Generally, white gold wire, copper wire, tungsten wire and semiconductor (thermistor, etc.) are used as temperature measuring resistors. These resistors have their own advantages and disadvantages. . Sensors for household air conditioners are mostly in thermistor type.
    The thermistor thermostat is based on the Wheatstone bridge principle (left) is the Wheatstone bridge. Connect the power supply E to both ends of the BD. According to Kirchhoff's law, when the resistance of the bridge is R1×R4=R2×R3, the potentials of the two points A and C are equal, and no current flows between the output terminals A and C. The magnitude of the resistance R1 of the thermistor changes as the ambient temperature rises or falls, causing the balance to be broken and an output current between the ACs. Therefore, when the thermostat is constructed, the temperature adjustment range and operating temperature can be easily changed by selecting an appropriate thermistor.
Third, metal expansion thermostat
    According to the principle of thermal expansion and contraction of objects. Thermal expansion and contraction are commonalities of objects, but different objects have different degrees of thermal expansion and contraction. The two sides of the double gold piece are conductors of different materials. At different temperatures, the double gold piece is bent due to the different degree of expansion and contraction, and the set contact or switch is touched, so that the set circuit (protection) starts working.

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