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Freeze dryer used in refrigeration compressors currently used in most high temperature hermetically sealedreciprocating compressor
, and its features are: compact, small size, light weight, small vibration, low noise, high energy efficiency ratio.As the sealed compressor motor and compressor body sealed in a steel shell, the electric motor in the refrigerant gas environments, cooling conditions were better, longer life expectancy.The lower part of the shell there is a specified number of oil, the compressor work, the ministries automatic oil supply, usually do not need to add oil.In the large cold and dry machine, also used semi-hermetic reciprocating or screw compressors, they feature large cooling power, the load can be adjusted to suit different needs.
2, heat exchanger, evaporator heat exchange in cold and dry in the main role is to use the evaporator to be cooled compressed air carried by the cold (for most users, this part of the waste cold is cold) and use this part of the cooling capacity to carry large amounts of cooling water vapor high temperature compressed air, thus reducing the cold-dry cooling system heat load mechanisms to achieve energy savings.On the other hand, low air temperature in the heat exchanger to be picked up, so that the outer wall of the exhaust pipe temperature is too low and will not appear due to condensation.
Evaporator iscold and dryparts of the main heat exchanger, compressed air is forced in the evaporator cooling, most of which water vapor condenses into liquid water cooling and discharged outside the machine, so that the compressed air to be dry.In the evaporator to the low pressure refrigerant vapor between the air and convection heat and mass transfer through the throttling device after the low-pressure liquid refrigerant in the evaporator in a phase of low-pressure refrigerant into steam, the process of absorption in the phase change around the heat so that the compressed air cooling.
In order to get higher as the heat transfer, heat transfer coefficient that is added to increase the heat of the heat transfer area, the dryer and the evaporator heat exchanger copper tube aluminum fin wall with a set of measures .Heat Exchange Copper Tube on both sets of fins can reduce the air after the impact of copper and brass to avoid rupture.
3, the condenser, the second condenser (back to pre-cooling heat)
In cold and dry in the condenser is the role of the refrigerant compressor discharge pressure, superheated refrigerant vapor into the cooling liquid refrigerant, so that the cooling process can be continuously carried out.As the refrigerant condenser exhaust heat includes the heat from the evaporator and draw power from the compression conversion over heat.Therefore, the condenser load is far greater than the evaporator, condenser, cold and dry sub-machine air-cooled (air-cooled condenser) and water cooled (water-cooled condenser) two.
Secondary condenser (back to pre-cooling heat) in the machine and the heat exchange function of the same, the difference is between high and low temperature heat exchanger is mainly compressed air heat exchanger, and condensing the second major use of compressed air and low temperature high-pressure part of the refrigeration system for cooling, so that to achieve sufficient cooling refrigerant, thereby enhancing the machine's cooling efficiency, while avoiding the bad machine condenser cooling caused by high jumping machine or machine failure.
4, cyclone (gas-water separator)
Cyclone separator is a kind of inertia, more used in gas-solid separation.Tangent direction along the cylinder wall of compressed air into the separator, which produces the rotation, mixed gases and water droplets also rotate along with the centrifugal force, the quality of large centrifugal force generated by large droplets, large droplets under the centrifugal force moves to the outer wall, hit the outer wall (and baffle) and then gather and grow up with gas separation.
5, the hot gas bypass valve in the cooling air in the evaporator, there are a large number of condensate precipitation.If the refrigerant evaporation temperature is too low, the copper surface temperature in the evaporator load conditions below the freezing point of water, the water will condense in the evaporator in the ice, severe airflow obstruction channel, so that gas pipeline paralysis.To prevent this from happening, the refrigerant evaporation temperature must be controlled.Its simple and effective measure is between the condenser and evaporator addition of a hot gas bypass valve, hot gas bypass valve piezometric pressure directly connected with the evaporation.When the evaporator pressure falls below a certain level, automatic hot gas bypass valve opens, the high temperature refrigerant in the condenser vapor directly into the evaporator to enhance the evaporation temperature, the ice block to avoid the phenomenon.
6, thermal expansion valve or capillary tube (throttle)
Expansion valve (capillary tube) is the cooling system throttle body.In cold and dry machine, evaporator refrigerant supply and regulator is achieved through the throttle body.Throttle body to high temperature and pressure liquid refrigerant from the evaporator.When the load changes, thermal expansion valve overheating by detecting the temperature to adjust the compressor suction valve opening degree, to control the supply of refrigerant into the evaporator.Capillary characteristics of the self-compensation, that is, when the pressure decreases, evaporation, both ends of the pressure will be increased accordingly, thereby increasing the amount of refrigerant into the evaporator.Capillary as simple structure, stable, cold and dry machine in a small universal application.
7, automatic drain valve in the refrigeration dryer, the condensation of condensate should be promptly discharged equipment, to avoid condensation of air moisture emissions do not increase in time in order to facilitate the discharge of water condensation on the device is equipped with automatic drain When the drain valve water valve cup water does not meet a certain height, the pressure of compressed air pressure will float off the drainage holes, it will not cause air leaks: water cup with the water level (cold and dry machine and at this time not water), float up to a certain height when they open the drainage hole, the cup under the effect of condensate in the air quickly from the plane.◎ used in addition to regular float type auto drain, but also often use e-automatic drain, drain time and twice this time interval can be adjusted drainage and high pressure capability, is quite common.
8, the operation of the filter drier refrigeration equipment, refrigerant and refrigerant oil because there is water, solid powder, dirt and other impurities, the situation is serious cause throttle orifice structure have dirty block.Therefore, for the liquid refrigerant pipe to be installed before the filter drier.In addition, moisture in the refrigerant cooling system of the most harmful.Of refrigerant, refrigeration oil and