The importance of refrigeration compressors in the entire cold storage refrigeration system is self-evident, I believe everyone knows. Next, I will watch the Xiaobian teach you to turn things around.
If a large amount of water vapor or refrigerant is drawn into the refrigeration compressor,Semi-Hermetic Compressor & Condensing Units it may cause frost on the cylinder head of the refrigeration compressor. Even worse, it can even cause crankcase frosting. So what is the source of water vapor or refrigerant entering the refrigeration compressor? There are two main points:
The opening of the thermal expansion valve is too large, or the installation of the temperature sensor package and the looseness of the fixing are loose. Mainly because the temperature sensor package may feel the temperature is too high in this case, which causes the valve core to open automatically;
The thermal expansion valve mainly reflects the superheat at the outlet of the evaporator, and the refrigerant flow rate of the evaporator is automatically adjusted if there is a deviation in the degree of superheat at the outlet of the evaporator.
When the value detected by the transmitter deviates from the given value, the physical quantity of the transmitter changes. It also produces enough energy to directly push the actuator. The position change of the general actuator and the set parameters are directly linked.
In the previous content, we repeatedly introduced the superheat expansion valve according to the balance method, generally divided into two types: internal balance type thermal expansion valve and external balance type thermal expansion valve. The liquid refrigerant absorbs heat in the evaporation of the evaporator and then completely vaporizes when it flows to the evaporator outlet. And usually accompanied by a certain degree of superheat. The temperature sensing cylinder of the thermal expansion valve is generally in close contact with the outlet pipe of the evaporator, so that the temperature of the evaporator outlet is felt.