Description
The liquid expansion type thermostat is a commonly used thermostat. It achieves temperature control by regulating the volume change of the internal liquid. It consists of a lower fixed part, an upper hydraulic part, and a capillary tube.
The rotary switch of the liquid expansion type thermostat is equipped with a temperature probe. When the set required temperature is reached, the liquid inside the temperature probe will expand due to the heat source.
This expansion (increased pressure) causes the partition inside the mechanical temperature control switch to act, blocking the power supply and stopping the power supply. When the temperature drops, the liquid inside the temperature probe shrinks (the pressure drops), the internal partition will return to its original position, and the power supply will continue without being blocked.
The liquid expansion design in the temperature controller is based on the principle that when the temperature of the controlled object changes, the liquid in the temperature-sensing part will undergo volume changes according to the principle of thermal expansion and contraction.
One of the major advantages of the liquid expansion type thermostat is its high temperature control accuracy, which can stably and reliably maintain the set temperature and has a relatively small temperature difference between starting and stopping. In addition, it also has a wide adjustment range and can adapt to different temperature control requirements. The characteristic of large overload current also makes it perform well when dealing with high-power electrical appliances and electric heating equipment.
This type thermostat is widely used in the home appliance industry, electric heating equipment and refrigeration industry, and is a key component for ensuring the normal operation of equipment and temperature control. Whether it is household appliances or industrial equipment, liquid expansion thermostats play a crucial role in maintaining stable temperature.
The refrigerator at home suddenly stopped cooling, and the temperature of the water heater was always inaccurate. Understanding the principle of the liquid expansion thermostat allows you to troubleshoot over 80% of the problems by yourself. The first step is to look at the temperature sensing part, which is a small metal rod inserted into the inner wall of the refrigerator or the water tank of the water heater. It contains a special liquid. When the temperature changes, this liquid will expand or contract like a blown-up balloon. The second step is pressure transmission,the change in liquid volume will be transmitted through a capillary tube that is thinner than a straw to the diaphragm. This diaphragm is like a breathing metal sheet. When it is compressed, it will deform. In the third step, the switch controls. As soon as the diaphragm moves, it will drive the small lever, causing the circuit contacts to open. Once the temperature drops, the liquid contracts and the diaphragm rebounds. The circuit then automatically reconnects.
The Role of Capillary Tube in Temperature Control Switch
The capillary tube plays a crucial role in the liquid expansion type thermostat. It not only senses changes in the ambient temperature but also converts these changes into mechanical actions to control the circuit's on-off state. By precisely controlling the temperature-sensitive liquid inside the capillary tube, the liquid expansion type temperature control switch can accurately act at the set temperature point, achieving effective temperature control.
Application Note
When using this thermostat, the following points should be noted: Firstly, make sure that the capillary tube is in close contact with the temperature sensing part to improve the accuracy of temperature sensing; Secondly, avoid squeezing or bending the capillary tube with external force, as this may affect its normal operation; Finally, regularly inspect and maintain the temperature control switch to ensure its long-term stable operation.
In conclusion, the liquid expansion type thermostat plays a crucial role in the temperature control system.
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