What are the common temperature switches?
First, vapor pressure type temperature switch
The action of the bellows acts on the spring, the spring of the spring is controlled by the knob on the control panel, and the capillary is placed at the chamber inhaled air in the air conditioner, and the temperature of the indoor cycle is reacted. When the room temperature rises to the modulated temperature, the thermostat gas in the capillary and the bellows expands, so that the bellows are elongated and overcome the spring stretch to turn the switch contact, at this time, the compressor is operated, the system is refrigerated until room temperature When it is reduced to the set temperature, the temperature of the temperature is contracted,
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the bellows shrinkage is operated with the spring, and the switch is turned off to cut the motor circuit of the compressor. This is repeatedly operated to achieve the purpose of controlling the temperature of the room.
Second, electronic temperature switch
Electronic temperature controller (resistance) is measured by a method of resistance temperature temperature, generally using platinum wire, copper wire, tungsten wire, and semiconductor (thermistor, etc.) to temperature resistance, these resistors have its advantages and disadvantages. . Most of the sensors of household air conditioners are in thermistor resistance.
The thermistor temperature controller is made according to the principle of Wheeth Bridge, and (left) is a Horsesden Bridge. At both ends of the BD, the power supply E is connected. According to the law of Kirhof, when the resistance R1 × R4 = R2 × R1 × R4 = R2 × R3 of the bridge, the potential of the two points, and there is no current between the outputs A and C. The size of the impedance R1 of the thermistor changes with the rise or decrease of the ambient temperature, so that the balance is damaged, and there is an output current between the ACs. Therefore, when constituting the thermostat, the temperature adjustment range and operating temperature can be easily changed by selecting the appropriate thermistor.
Third, metal expansion temperature switch
According to the principle of thermal expansion of the object. The thermal expansion is the commonality of the object, but the degree of thermal expansion of different objects is not the same. Two sides of the double gold tablets are conductors of different substances. At the temperature of the change, the double gold tablets are bent, and the set contacts or switches are hit, and the set circuit (protection) will begin.