冷干机属于气动系统中的气源处理元件。冷干机由制冷压缩机、冷凝器、蒸发器、膨胀阀这几部分组成。冷干机按照冷却的方式分为了水冷型与气冷型这两种；按进气温度分为常温进气型与高温进气型；按工作压力分普通型、中、高压型。还有许多特殊规格的冷干机能用来处理非空气类介质。接下来介绍一下冷干机工作原理。
冷干机属于气动系统中的气源处理元件。冷干机由制冷压缩机、冷凝器、蒸发器、膨胀阀这几部分组成。冷干机按照冷却的方式分为了水冷型与气冷型这两种；按进气温度分为常温进气型与高温进气型；按工作压力分普通型、中、高压型。还有许多特殊规格的冷干机能用来处理非空气类介质。接下来介绍一下冷干机工作原理。
冷干机工作原理
冷冻式压缩空气干燥机通过冷却降温，使压缩空气中的水蒸气凝结成液滴，从而达到减少含湿量的目的，凝结出的液滴经过排水系统排出干燥机。压缩空气进入干燥机的预冷器中，在预冷器里，进入的热空气被出去的冷空气先冷却降温一部分，这就减少了系统的负荷。预冷后的空气然后进入蒸发器，在这里，空气放出的热量被冷媒吸收，冷却到预先设定的温度。
空气被冷却后就使水蒸气凝结成液滴，并通过汽水分离器从空气中分离出来，又经自动排水器排出机外，离开汽水分离器后，冷空气进入预热器的壳程，与入口热空气进行热交换在被加热到大约与入口空气相差10℃后离开干燥机。这种再加热防止外部出口空气管路和下游管路的二次结露，还增加了空气的能量，提高了效用。此外，压缩空气经过干燥机后，其中的大直径固体尘粒都已经被滤除，气源品质达到清洁、干燥的要求。空气先经预冷器降温除去一部分水，再经蒸发器大幅度降温除去大量的水，通过挡水板或汽水分离器把冷凝水排到隔污桶，再经排水器排出。
冷干机工作过程
制冷压缩机将蒸发器内的低压(低温)制冷剂吸人压缩机汽缸内，制冷剂蒸汽经过压缩，压力、温度同时升高；高压高温的制冷剂蒸汽被压至冷凝器，在冷凝器内．温度较高的制冷剂蒸汽与温度比较低的冷却水或空气进行热交换．制冷剂的热量被水或空气带走而冷凝下来，制冷剂蒸汽变成了液体。这部分液体再被输送至膨胀阀，经过膨胀触节流成了低温低压的液体并进^蒸发器；在蒸发器内低温、低压的制冷剂液体吸收压缩空气的热量而蒸发，而压缩空气得到冷却后凝结出大量的液体水；蒸发器中的制冷剂蒸汽叉被压缩机吸走，这样制冷剂便在系统中经过压缩、冷凝、节流、蒸发这样四个过程，从而完成了一个循环。
以上就是为大家介绍的冷干机工作原理了，在使用的过程中要经常去检查制冷系统，定期擦除设备表面的油污和尘埃。清除地面上的灰尘及油污，保持冷干机周围环境的整洁。以确保冷干机能长时间的正常工作。
The air source processing element in the pneumatic system. The cooling and drying machine is composed of refrigeration compressor, condenser, evaporator and expansion valve. According to the way of cooling, the cold-drying machine is divided into water-cooled type and air-cooled type. According to the intake temperature, it is divided into normal temperature intake type and high temperature intake type. According to the working pressure of the general type, medium, high pressure type. There are also a number of special specifications of cooling and drying machines to deal with non-air media. Next, introduce the working principle of the cold dryer.
Working principle of cold dryer
Refrigerated compressed air dryer through cooling, so that the compressed air vapor condenses into droplets, so as to achieve the purpose of reducing the moisture content, condensed droplets through the drainage system out of the dryer. Compressed air enters the dryer's pre-cooler, in the pre-cooler, the incoming hot air is cooled by the cold air out of the first part, this reduces the load on the system. The precooled air then enters the evaporator, where the heat from the air is absorbed by the refrigerant and cooled to a predetermined temperature.
After the air is cooled, the water vapor condenses into droplets, which are separated from the air through the soda separator and discharged from the machine through the automatic drain. After leaving the soda separator, the cold air enters the shell side of the preheater and conducts heat exchange with the hot air at the inlet. After being heated to about 10℃ different from the inlet air, it leaves the dryer. This reheating prevents secondary condensation in external outlet air lines and downstream air lines, and increases the energy and utility of the air. In addition, after the compressed air passes through the dryer, the large diameter solid dust particles are filtered out, and the air source quality meets the requirements of cleaning and drying. Air cooling by pre-cooler to remove part of the water, and then by the evaporator large cooling to remove a lot of water, through the baffle plate or soda separator to drain the condensed water to the pollution bucket, and then through the drainage device.
The working process of the cold dryer
The refrigerating compressor absorbs the low pressure (low temperature) refrigerant in the evaporator into the compressor cylinder, and the refrigerant steam is compressed, and the pressure and temperature rise at the same time. High pressure and high temperature refrigerant vapor is pressed into the condenser, inside the condenser. Higher temperature refrigerant vapor and lower temperature cooling water or air heat exchange. The heat from the refrigerant is carried away by water or air and condenses. The refrigerant vapor turns into a liquid. This part of the liquid is then transferred to the expansion valve, through the expansion of contact throttle into low temperature and low pressure liquid parallel to the evaporator; In the evaporator, the refrigerant liquid at low temperature and low pressure absorbs heat from the compressed air and evaporates, while the compressed air is cooled and condenses a large amount of liquid water. The refrigerant vapor fork in the evaporator is sucked away by the compressor, so the refrigerant goes through the four processes of compression, condensation, throttling and evaporation in the system, thus completing a cycle.
The above is for you to introduce the working principle of the cold dryer, in the use of the process to often check the refrigeration system, regularly wipe the equipment surface oil and dust. Remove dirt and grease from the floor and keep the surrounding area clean. To ensure that the cold - dry function long - term normal work.
