Precautions for copper capillary
- 2019-03-07-

There is no refrigerant inside the copper capillary tube. The running water and the drain pipe are attached to the transpirator.Copper capillaryIt is the throttling component in the refrigeration system, which mainly plays the throttling and pressure reduction effect. In the refrigeration system, the liquid from the condenser will encounter greater resistance when passing through the fine copper capillary tube, so the flow of liquid refrigerant is reduced, which limits the flow of refrigerant into the evaporator and keeps the condenser relatively stable The pressure difference between the two ends of the copper capillary tube is also stable, so that the pressure of the refrigerant entering the evaporator is reduced, and sufficient transpiration and heat absorption are carried out to achieve the purpose of refrigeration (Note: the copper capillary tube generally adopts an inner diameter of about 0.6 to 2.0 mm The length of the copper tube is determined according to the flow rate determined after the performance of the refrigeration system is matched).
Precautions for the use of copper capillary:
1. The amount of Freon filled into the system must be accurate. Once the diameter and length of the copper capillary tube are selected, its liquid supply capacity is fixed.
2. On the high-pressure side pipeline of the refrigeration cycle, there should be no place where the refrigerant tends to accumulate, so as to prevent the liquid from flowing into the evaporator when the compressor is stopped, and it is likely to cause liquid hammer when it is restarted. Therefore, the refrigeration system should not be equipped with a liquid reservoir.
3. Set a filter before the copper capillary to prevent the inner hole of the copper capillary from being blocked by dust in the system (called dirty blocking).
4. The moisture in the refrigeration system should be strictly controlled within the regulated range to prevent ice blockage at the outlet end of the low temperature.
5. Since the refrigerant liquid flows from the condenser into the copper capillary tube, it maintains a relatively high temperature in most of the tube length, and is only colder at the end. Therefore, in refrigerators and other refrigeration equipment, the 70cm long section of the copper capillary near the condenser is often welded or wrapped with the suction pipe of the compressor to form a regenerator, allowing the condensate to exchange heat with the low-temperature refrigerant vapor. Not only can the suction of the compressor be overheated to ensure dry compression, but also the condensate can be overcooled, reducing the generation of flash vapor in the copper capillary tube, and then increasing the liquid supply and increasing the cooling capacity.
6. According to needs, several copper capillary tubes can be used in parallel. At this time, it is necessary to use a dispenser, and through careful adjustment, the working conditions of several copper capillary tubes are basically the same.
7. The copper capillary tube must be cleaned and dried, and the flow rate of each copper capillary tube must be measured before it can be used.