The characteristics of the throttle device of refrigerant in refrigeration equipment

first of all, the high pressure liquid refrigerant throttling depressurization, guarantee the pressure differential between the condenser and evaporator, so that the liquid refrigerant in the evaporator in the requirements of the low pressure evaporation heat, so as to achieve the aim of refrigeration decompression; At the same time, the gaseous refrigerant in the condenser at a given pressure down hot, condensation.

second, adjust into the evaporator refrigerant flow, in order to adapt to the change of the evaporator heat load, the refrigeration unit to work more effectively. In view of the throttle body has the function of the control into the evaporator liquid refrigerant mass flow, so sometimes also called a flow control mechanism. Also, it makes high pressure liquid refrigerant throttling depressurization, the refrigerant is a valve hole into wet steam boiling, therefore is also called the throttle or expansion valve. Commonly used throttle body has the following kinds: manual type expansion valve, the ball float valve, thermal expansion valve and capillary a expansion valve, manual type manual type expansion valve are of a similar structure and normal cut-off valve is the valve core to have needle cone or Ⅴ cone of gap. Stem with fine thread, when rotating the handwheel, can make the valve opening or alkali, increase slowly, ensure good regulation performance. Its marked characteristics is not easy to bad. Management according to the change of the heat load of evaporator and other factors, to manually adjust the expansion valve opening, therefore, the management of trouble, and need higher experience, in the recent more adopt expansion valve automatically, and manual expansion valve on the bypass pipe, only as a supplementary role. Second, the ball float valve ball float valve is used to more full liquid type evaporator, the evaporator liquid level is asked to keep a certain height, is in keeping with the characteristics of the ball float valve. According to the liquid refrigerant flow is different, it can be divided into straight-through and straight-through type two kinds, they each have advantages and disadvantages. Straight-through expansion valve supply evaporator liquid, first of all, all through the float chamber, and then through the tube into the evaporator liquid balance, so it has the characteristics of simple structure, but the float chamber of the liquid level fluctuation is bigger, is larger on the impact of the valve core, valve core is easy to damage; At times, we need a balance of large diameter pipe. Non cut-through floating ball valve, valve body, the floating ball room refrigerant without float chamber after the throttle, but along the pipeline directly into the evaporator, therefore, float chamber liquid surface is smooth, but complex in construction and installation. Third, thermal expansion valve and ball float valve is different, it is not by controlling liquid level, but control the degree of superheat of refrigerant evaporator export gas to control the refrigerant flow into the evaporator. Because some of the area of the evaporator must be used to make gaseous refrigerant overheating, so it is widely used in air conditioning or cryogenic system ( Especially the freon refrigeration system) All the full liquid type evaporator. Thermal expansion valve type because the balance in a different way, or that the evaporation pressure to mold piece inside the cavity under way is different, can have internal balance and external balance type two kinds. Capacity is one of the important parameters for thermal expansion valve, so we must know the main prison element affecting the capacity: 1. The pressure difference between the expansion valve and 2. Evaporation temperature. 3. Refrigerant super-cooling degree. Thermal expansion valve installation position must be near the evaporator, the body should be vertically, not tilt, more can't reverse installation. Mainly thermal package installation, usually the wind on the suction pipe, close to the wall, bandage tightly, remove oxide skin contact point should be clean, bared metal pipe ecru, when necessary as a protective layer, a layer of aluminum paint to prevent rust. Four, capillary capillary is according to the 'gas liquid ratio is very easy by' the principle of work. Its ability mainly depends on the entrance of capillary fluid for the state of the refrigerant and capillary geometry size. With the increase of inlet pressure capillary fluid production capacity increase, increasing the length of the capillary, narrow diameter, reduce feed liquid ability accordingly. Capillary has its advantages, simple structure, no moving parts, the price is low, use it when it's not installed accumulator system; Filling the refrigerant is less; And after the compressor shut down, the pressure inside the condenser and evaporator can rapidly balance automatically, reduce the load of the motor when it is started. The disadvantages of it is its poor regulation performance, its ability of feed liquid can't along with the fluctuation of condition adjustment.

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