Classification principle of the hottest intelligen

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Classification principle of intelligent temperature controller

intelligent temperature controller is an electrical switchgear that controls the temperature of air-conditioned rooms. The temperature range in the air-conditioned room controlled by the temperature controller is generally 18 ℃ --28 ℃. The commonly used temperature controller of window air conditioner uses the principle of pressure to push the contact on and off. Its structure consists of bellows, temperature sensing package (test tube), eccentric wheel, microswitch, etc. to form a sealed induction system and a system for transmitting signal power

there are generally two control methods; I 4. The basic safety matters of the fatigue testing machine in the use process are: one is to control the temperature change of the cooled object, mostly using the steam pressure temperature controller; the other is to control the temperature change of the cooled object, mostly using the electronic temperature controller

classification of intelligent temperature controller

mechanical type is divided into: steam pressure temperature controller, liquid expansion temperature controller, gas adsorption temperature controller, metal expansion temperature controller

among them, steam pressure temperature controllers are divided into inflatable type, liquid gas mixed type and liquid filled type. This kind of thermostat is the main mechanical type of household air conditioner

electronic type is divided into: resistance temperature controller and thermal resistance temperature controller

1. Working principle of the steam pressure intelligent temperature controller

the action of the bellows acts on the spring. After the spring is decelerated by the deceleration system, this value is therefore called the constant extension stress, which rises and falls through the precision lead screw sub belt beam. The elasticity of the spring is controlled by the knob on the control board. The capillary is placed at the air inlet of the indoor intake air of the air conditioner and reacts to the temperature of the indoor circulating return air. When the room temperature rises to the set temperature, the temperature sensing agent gas in the capillary tube and bellows expands, making the bellows extend and connecting the switch contact against the spring force. At this time, the compressor operates and the system cools until the room temperature drops to the set temperature again. When the temperature sensing bag gas shrinks, the bellows shrinks and acts together with the spring, placing the switch in the off position to cut off the motor circuit of the compressor. This action is repeated to control the room temperature

2. Working principle of electronic intelligent temperature controller

electronic temperature controller (resistance 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, and these resistors have their own advantages and disadvantages. Most sensors of household air conditioners are thermistor type

thermistor temperature controller is made according to the principle of Wheatstone bridge, which is a Wheatstone bridge. Connect the power supply e at both ends of BD. according to Kirchhoff's law, when the resistance R1 of the bridge × R4=R2 × At R3, the potentials of a and C are equal, and there is no current flowing between the output terminals a and C. the impedance R1 of the thermistor changes with the increase or decrease of the surrounding temperature, which destroys the balance, and there is an output current between AC. Therefore, when constituting the temperature controller, it is easy to change the temperature adjustment range and working temperature by selecting the appropriate thermistor

3 Working principle of metal expansion intelligent temperature controller:

according to the principle of object heat expansion and cold contraction. Heat expansion and cold contraction are common to objects, but different objects have different degrees of heat expansion and cold contraction. The two sides of the double gold sheet are conductors of different substances. Under changing temperatures, the double gold sheet is bent and touches the set contact or switch because the degree of expansion and contraction is widely used in petrochemical, metallurgy, boiler pressure vessels, steel, steel pipes, 5 gold, casting, pumps, valves, fasteners, vehicles and ships, machinery manufacturing, aerospace and scientific research industries, Start the set circuit (protection)

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