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The elimination method of refrigeration system blockage

Troubleshooting of ice block

Ice block failure occurs in the refrigeration system because there is excess water in the system, so the entire refrigeration system must be dried. There are two ways to deal with it:

1. Use a drying oven to heat and dry each part. Remove the compressor, condenser, evaporator, capillary and return pipe in the refrigerant system from the refrigerator and put them into the drying oven for heating and drying. The temperature in the oven is about 120℃ and the drying time is 4 hours. Replace the new filter dryer, and then can be assembled and welded, pressure leak detection, vacuuming, filling refrigerant, test run and sealing. This method is the best way to eliminate the ice block fault, but it is only applicable to the warranty department of refrigerator manufacturers. General repair departments can use heating and extraction methods to eliminate the ice block fault.

2, the use of heating vacuum and secondary vacuum method to eliminate the moisture of refrigeration system components.

2 Troubleshooting dirty and blocking faults

There are two ways to eliminate the capillary blockage fault: one is to use high-pressure nitrogen gas combined with other methods to blow out the clogged capillary dirt, capillary blowing through, after cleaning and drying of the refrigeration system components, assembly and welding will remove the fault. If the capillary blockage is serious and the above method cannot remove the fault, the method of replacing the capillary is used to remove the fault, which is described as follows:

1, with high pressure nitrogen blow out dirt in the capillary: cut process pipe fluid, the capillary from the filter drier, welding pipe connected to the 3-way valve repair the compressor technology, the high pressure nitrogen filling the 0.6 ~ 0.8 MPa, and the capillary unbend carbonizing flame heating with gas welding, tube dirt carbide, under the effect of high pressure nitrogen blow out the dirt within the capillary. After the capillary was unblocked, 100 ml of carbon tetrachloride was added for aerating cleaning. The condenser can be cleaned with carbon tetrachloride on the pipe cleaning device. Then replace the filter dryer, then fill nitrogen leak detection, vacuum, and finally fill refrigerant.

2. Replace the capillary: if the dirt in the capillary can not be rushed out by the above method, the capillary can be replaced together with the low pressure tube. First, remove the low-pressure tube and capillary tube from the copper-aluminum joint in evaporator by gas welding. During disassembly and welding, the copper-aluminum joint should be wrapped with wet cotton yarn to prevent the aluminum tube from burning at high temperature.

The outlet of the capillary is not welded to the inlet of the evaporator at first. Repair valves and pressure gauges are installed at the inlet and outlet of the compressor. After the compressor runs, the air is inhaled from the low-pressure repair valve. If the pressure exceeds, the flow rate is too small, and a section of capillary can be cut off until the pressure is appropriate. If the pressure is too low, it means that the flow is too large. The capillary can be turned several times to increase the resistance of the capillary, or a capillary can be replaced. After the pressure is appropriate, the capillary can be welded with the inlet tube of the evaporator.

When welding the new capillary tube, the length of the copper and aluminum joint should be about 4 ~ 5cm to avoid welding blockage. When the capillary tube is welded with the filter dryer, the insertion length should be 2.5cm. If the capillary tube is inserted into the filter dryer too much, it is too close to the filter screen, and the tiny molecular sieve particles will enter the capillary tube and block it. If the capillary is inserted too little, impurities and molecular sieve particles during welding will enter the capillary and directly block the capillary channel. Therefore, the capillary is inserted into the filter, neither too much nor too little. Too much or too little poses a risk of blockage. Figure 6-11 shows the connection position between capillary and filter dryer.

3 Troubleshooting of oil blockage

Oil blocking fault, indicating that there is too much refrigerant oil in the refrigeration system, so as to affect the refrigeration effect, or even refrigeration, so it is necessary to clean the refrigerant oil in the system.

When the filter oil is blocked, a new filter should be replaced. At the same time, part of the refrigerant oil accumulated in the condenser should be blown out with high-pressure nitrogen. When nitrogen is passed, an electric hair dryer can be used to heat the condenser.