When it comes to thermostatic switches, let's first understand how a switch is defined? From the literal meaning of the understanding is to open and close, it is our daily life will come into contact with a device, it can also refer to an electronic component that can make the circuit open, make the current interrupt or make it flow to other circuits. The temperature control switch is a kind of temperature according to the surrounding environment to adjust the opening or closing of a kind of automatic control elements, can be said to be very convenient and practical, and by the majority of consumers praise and love. Today we will focus on the temperature control switch what characteristics and contains what kinds.
Temperature control switch features
New temperature control switch, including the shell, zero, fire input, zero, fire output and control? Switch, characterized by the control switch and the firewire output connected in series between the interthermal temperature relay and heating element, the use of the load shunt, the physical changes in the load caused by temperature changes through the heating element introduced into the interthermal temperature relay for measurement and control, the distance between the switch and the load is unrestricted, eliminating the switch and the load between the mutual influence of the switch and the load, and in addition, due to the sensing element and the load is not direct contact In addition, because the sensing element is not in direct contact with the load, the load will not have frequent starting phenomenon, with reliable operation, simple lines, easy to use features, can be widely used in a variety of electrical equipment.
Types of temperature control switches
1, vapor pressure type
The action of the bellows acts on the spring, the spring's elasticity is controlled by the knob on the control board, the capillary tube is placed in the air conditioning unit indoor inhalation of air at the air outlet, the indoor circulation of the temperature of the return air to react. When the room temperature rises to the set temperature, the capillary tube and bellows in the temperature-sensitive agent gas expansion, so that the bellows elongation and overcome the spring elasticity of the switch contacts on, the compressor is running, the system refrigeration, until the room temperature falls to the set temperature, the temperature-sensitive package of gas contraction, bellows contraction and the spring with the action of the switch is placed in the off position, so that the compressor motor circuit is cut off. This repeated action, so as to achieve the purpose of controlling the room temperature.
2, electronic
Electronic temperature controller (resistive) is the use of resistance to measure the method of temperature sensing, generally using platinum wire, copper wire, tungsten wire and semiconductors (thermistors, etc.) for the temperature measurement resistance, these resistors have their advantages and disadvantages. Household air conditioning sensors are mostly thermistor type. Connected to the power supply E at both ends of the BD, according to Kirchhoff's law, when the bridge resistance R1 × R4 = R2 × R3, the potential of A and C points are equal, there is no current flow between the output terminal A and C, the size of the impedance of the thermistor R1 with the rise or fall of the surrounding temperature, so that the balance is disturbed, there is an output current between the AC. Therefore, in the composition of the thermostat, you can easily change the temperature adjustment range and operating temperature by selecting the appropriate thermistor
3, metal expansion type
Based on the principle of thermal expansion and contraction of the object. Thermal expansion and contraction is the object of the **** nature, but the degree of thermal expansion and contraction of different objects is not the same. The two sides of the double gold sheet is a conductor of different substances, in the changing temperature due to the degree of expansion and contraction is not the same and make the double gold sheet bending, touching the set contacts or switches, so that the set circuit (protection) began to work.
Temperature adjustment switch can be said to be widely used in indoor air conditioning, according to its unique working principle, when the indoor temperature is lower than a certain threshold value we set, will automatically turn off the air conditioning; and when the indoor temperature is higher than a certain set value, will automatically open the air conditioning. It can be said that it is very intelligent, so that consumers are free from subsequent worries. Through the above introduction, we understand that the temperature adjustment switch is divided into vapor pressure type, electronic type, metal expansion type three, no matter for which one, its working principle is the same, you can choose according to their own favorite.