How to deal with the blockage of industrial chillers

How to deal with the blockage of industrial chillers

Usually, after a long period of use of the industrial chiller, some failures will inevitably occur. Among them, the blockage caused by the inlet and outlet of the capillary will affect the working status of the entire equipment and cause the cooling performance to decrease. At this time, users need to deal with the fault in time, and then let's learn about the method to deal with the blockage of the industrial chiller.

1. The method of cleaning the evaporator pipeline is to disconnect the power supply of the industrial chiller, open the process pipe nozzle on the compressor, disconnect the air return pipe connected to the compressor, and install a repair valve. And use a welding tool to seal a small section of copper tube tail left on the low pressure end of the compressor. Then disconnect the connection between the drying filter and the capillary, disconnect the connection between the compressor and the evaporator, and install a repair valve at the inlet of the evaporator, charge the refrigerant from the return pipe into the evaporator, and discharge it from the capillary. When the refrigerant is discharged, stop charging. At this time, the dry ammonia gas is injected into the evaporator from the return pipe at a pressure of 1 MPa, so that the high-pressure brick-mixed ammonia gas and the refrigerant are discharged from the capillary tube. After the capillary port has no misty cooling spray, stop charging Ammonia. Because the dry ammonia has the effect of absorbing moisture, it absorbs the moisture in the evaporator and the capillary tube, and takes the moisture out of the system along with the circulation. Moreover, the refrigerant has the characteristics of lipophilicity, which can be used to accumulate The refrigerating oil and other impurities in the pipeline are also discharged out of the system along with the circulation.

2. The method of cleaning the condenser pipeline is to separate the compressor and condenser connection of the industrial chiller, install a repair valve at the condenser inlet, fill the condenser with refrigerant, and discharge it from the dry filter port , Stop charging when refrigerant is discharged from the outlet of the filter dryer. Use 1MPa high-pressure dry ammonia gas from the repair valve into the condenser. After 2 minutes, when it is confirmed that no dirt and moisture are discharged, stop charging the dry ammonia gas and close the ammonia cylinder valve. The purpose of this is to extract the moisture and refrigerating oil in the condenser and make it out of the system.

　　3. The specific method of leak detection is to first connect the condenser return pipe port of the industrial chiller and the compressor process port, weld it with a silver electrode, and then replace the dry filter. At the same time, inject from the compressor process port, and then soak it in soapy water, check whether there is any leakage in the welding port of the whole system by observing whether there are bubbles coming out, if there are bubbles coming out, let go of the ammonia gas, and re-welding with a silver electrode , Repeat the above inspection steps of injecting gas to observe bubbles until no bubbles emerge and no leakage.

4. Connect a pressure vacuum gauge to the compressor process nozzle of the industrial chiller, and connect the valve head with a pressure-resistant hose to the vacuum pump to vacuum the system. The time is about 1 hour. When the pressure in the system drops to -0.1MPa At the following time, stop vacuuming, close the pressure gauge valve, remove the vacuum pump, connect the refrigerant cylinder, and charge the system with refrigerant in gas form. When the charge amount reaches 80% of the total, stop the charge and connect Power supply, start compression, after 10 minutes, refill refrigerant until the required total amount is reached, and then test the machine for more than 3 hours to see if there is any blockage and the temperature drop in the box is normal. If it is normal, you can adjust the process nozzle Carry out sealing treatment.