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    External balance thermal expansion valve

    External balance thermal expansion valve The difference between the external balance type thermal expansion valve and the internal balance type in structure and installation is that the space under the diaphragm of the external balance type valve is not in communication with the outlet of the valve, but a small diameter balance tube is used to communicate with the evaporator outlet Connected, so that the pressure of the refrigerant acting under the diaphragm is not Po at the inlet of the evaporator after throttling, but the pressure Pc at the outlet of the evaporator. When the diaphragm is balanced by force, it is Pg = Pc + Pw. The opening degree of the valve is not affected by the flow resistance in the evaporator coil tube, thereby overcoming the shortcomings of the internal balance type, and the external balance type is mostly used in the occasion where the resistance of the evaporator coil is large. Generally, the superheat of steam when the expansion valve is closed is called the superheat of closing. The superheat of closing is also equal to the superheat of opening when the valve hole starts to open. The closing superheat degree is related to the pretension of the spring, and its size can be adjusted by the adjusting rod. The superheat when the spring is adjusted to the loosest is called the minimum closed superheat; on the contrary, the superheat when the spring is adjusted to the tightest is called the maximum closed superheat. Generally, the minimum closing superheat of the expansion valve is not more than 2 ℃, and the maximum closing superheat is not less than 8 ℃. For internally balanced thermal expansion valves, the evaporating pressure acts under the diaphragm. If the resistance of the evaporator is relatively large, there is a large flow resistance loss when the refrigerant flows in some evaporators, which will seriously affect the thermal expansion valve. The working performance of the evaporator increases the superheat degree of the evaporator outlet, the superheat degree increases, and the utilization of the heat transfer area of the evaporator is unreasonable. For externally balanced thermal expansion valves, the pressure acting under the diaphragm is the outlet pressure of the evaporator, which is no longer the evaporation pressure, and the situation is improved.

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    External balance thermal expansion valve

    06/14/2020

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    Electronic expansion valve

    06/14/2020

    Electronic expansion valve

    Electronic expansion valve The electronic expansion valve is a speed type and is used in an intelligently controlled inverter air conditioner. The advantages of the electronic expansion valve are: large flow adjustment range; high control accuracy; suita器2䀀ￜ皥䖒皦즠Ʋ煔क़㲈Ʋ䌁皦ᮔDž༬皧煞क़Ѐ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥

    Cold storage operation management and compressor common fault handling

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    Capillary

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    As the core system of the cold storage, what equipment does the refrigeration system contain

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