Brief introduction of adjustable temperature control switch
Its structure consists of bellows, temperature sensor (test tube), eccentric wheel and microswitch, forming a sealed induction system and a system for transmitting signal power. Control methods are generally divided into two types; ? One is controlled by the temperature change of the cooled object, mostly using steam pressure thermostat, and the other is controlled by the temperature difference change of the cooled object, mostly using electronic thermostat.
Thermostats are divided into mechanical types: steam pressure thermostat, liquid expansion thermostat, gas adsorption thermostat and metal expansion thermostat. Among them, the steam pressure thermostat can be divided into inflatable type, liquid-gas mixed type and liquid-filled type. This thermostat is the main mechanical type of household air conditioner. Electronic type is divided into: resistance thermostat and thermal resistance thermostat.
Function of circuit system: The function of air conditioning circuit system is to control the normal and multifunctional operation of air conditioner and protect the normal operation of compressor and fan motor.
The components of the circuit system mainly include: temperature controller, thermal protector, main control switch and running capacitor, and the running capacitor of the fan motor is fixed in the control box. The function of the temperature controller is only to control the start and stop of the compressor.
Steam pressure type
The action of bellows acts on the spring, and the elasticity of the spring is controlled by the knob on the control panel. The capillary tube is placed at the air inlet of the air conditioner to respond to the temperature of indoor circulating return air. When the room temperature rises to the set temperature, the temperature-sensitive agent gas in the capillary and bellows expands, which makes the bellows elongate and overcomes the elastic force of the spring to make the switch contact connected. At this point, the compressor runs and the system cools. Until the room temperature drops to the set temperature again, the temperature sensor gas contracts, and the bellows contracts with the spring to make the switch in the off position, thus cutting off the motor circuit of the compressor. Repeat this action, thus achieving the purpose of controlling the room temperature.
Electronic adjustable temperature controller
Electronic temperature controller (resistance type) is measured by resistance temperature sensing. Generally, there are platinum wire, copper wire, tungsten wire and semiconductor (thermistor, etc. ) as a temperature measuring resistor, these resistors have their own advantages and disadvantages. The sensors of household air conditioners are mostly thermistor type. Thermistor thermostat is made according to the principle of Wheatstone bridge. Connect power supply e to both ends of BD. According to Kirchhoff's law, when the resistance of the bridge is R 1×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 impedance of the thermistor R1changes with the rise or fall of the ambient temperature, which destroys the balance and leads to the output current between AC. Therefore, when constructing the thermostat, the temperature adjustment range and working temperature can be easily changed by selecting the appropriate thermistor.
Adjustable metal expansion thermostat
According to the principle that objects expand when heated and contract when cooled. Thermal expansion and cold contraction are characteristics of objects, but different objects have different degrees of thermal expansion and cold contraction. On both sides of the bimetal are conductors of different substances. Under the changing temperature, the bimetal is bent due to different expansion and contraction degrees, and touches the set contact or switch, so that the set circuit (protection) starts to work.
Conclusion: The above is the adjustable temperature control switch that Bian Xiao told you today. I believe that after reading the story of Bian Xiao, you have a simple understanding of the classification and introduction of adjustable temperature switches, right? The appearance of controllable temperature control switch has greatly liberated people's time. It can make people do several things in a limited time. This greatly improves people's work efficiency, and it is indeed a very good invention for today's fast-paced life.