What is an air conditioning compressor?
Air-conditioning compressor plays the role of compressing and driving refrigerant in air-conditioning refrigerant circuit. Air-conditioning compressors are generally installed on outdoor machines. The air-conditioning compressor pumps the refrigerant from the low-pressure area, sends it to the high-pressure area for cooling and condensation after compression, and radiates heat into the air through the fins, and the refrigerant also changes from gas to liquid, and the pressure rises.
The working loop of air conditioning compressor is divided into evaporation area (low pressure area) and condensation area (high pressure area). The indoor unit and outdoor unit of the air conditioner belong to the low pressure area or the high pressure area respectively (depending on the working state). Then the refrigerant flows from the high-pressure area to the low-pressure area, and is injected into the evaporator through the capillary tube. The pressure suddenly drops, and the liquid refrigerant immediately becomes gaseous, and a lot of heat in the air is absorbed through the heat sink. In this way, when the compressor of the air conditioner works continuously, it will continuously absorb the heat at one end of the low-pressure zone into the refrigerant, and then send it to the high-pressure zone to radiate into the air, thus playing the role of regulating the temperature.
Air conditioning compressor replacement method:
1. cut off the power supply: before replacing the compressor, be sure to cut off the power supply of the unit. Otherwise, there is a danger of electric shock. When the compressor power supply is removed, each wire and the corresponding terminal should be marked, so that the wiring can be resumed after maintenance.
2. Refrigerant discharge: Open the valves on the high and low pressure sides with hexagonal sleeves, and pay attention to the ventilation of the working environment to prevent the operator from choking; The release speed of refrigerant should not be too fast, so as to avoid the operator being frostbitten by refrigerant. If possible, the refrigerant should be recycled instead of directly discharged to protect the environment.
3. Remove the suction pipe and exhaust pipe: Before removing the suction pipe and exhaust pipe, ensure that the refrigerant in the system has been discharged. Heat the weld with gas welding, and pull out the suction pipe and exhaust pipe after the solder at the weld melts. During the whole welding process, nitrogen gas must be filled, and the pressure of nitrogen gas is 0.5 0.1kgf/cm2, so as to avoid the oxidation of copper tubes and the generation of scale. Also, pay attention to whether there are impurities and foreign bodies on the inner wall of copper tube, and remove them in time if there are any. When welding, pay attention to control the flame direction and avoid casing and sponge. Wires, etc.
4. Replace the compressor and connect the suction pipe and exhaust pipe: replace the new compressor. When handling the compressor, the inclination angle of the compressor shall not be greater than 45. When pulling out the rubber plug of the compressor, the exhaust pipe must follow the suction pipe closely, and the interval between pulling out the rubber plug and welding the pipeline should not exceed 10 minute to prevent air moisture and impurities from entering the system and affecting the performance of the unit. Before welding, remove impurities such as oil stain, oxide, burr, etc. on the surface of the connecting pipe and the joint to ensure that the surface of the welded joint is clean and dry. During the whole welding process, nitrogen shall be filled for protection, with the nitrogen pressure of 0.5 0.1kgf/cm2, and the nitrogen shall be ensured to reach the welding position, so as to avoid the oxidation of the copper tube at the welding place to produce scale. When welding, pay attention to control the flame direction and avoid casing and sponge. Wires, etc.
5. Pressure-maintaining leak detection: After the suction and exhaust pipes are welded, pressure-maintaining leak detection is required. The gas used for pressure maintenance can only be inert gases such as nitrogen and carbon dioxide, and it is forbidden to use air, oxygen, acetylene and refrigerant instead to avoid safety accidents. Before pressurization, the pressure detection instrument should be connected to the system pressure test and leak detection pipeline, and the compressed gas cylinder should be connected according to the safety requirements, and the opening of each valve in the system should be checked. If the pressure holding is unqualified, it means that there is leakage in the system. Be sure to check the system for leaks. Re-weld or repair welding after leakage investigation, and then repeat the above pressure maintaining steps until it is qualified.
6. Evacuation: After installation, pressure maintenance and leak detection, before any system needs to be filled with refrigerant, the system must be evacuated to exhaust air and moisture in the system. It is forbidden to purge the pipeline with refrigerant for emptying. This method is difficult to completely remove the air and moisture in the system, especially when the system pipeline is long. It is forbidden to use the exhaust gas generated by compressor operation to vacuum, which will cause the compressor to burn out. Vacuuming with a vacuum pump is the only way to ensure that the system removes air and moisture. When vacuumizing, the appropriate vacuum pump should be selected according to the length of refrigerant pipeline. The vacuum pump is too small, the vacuumizing time is too long, or the required vacuum degree cannot be reached.
7. Refrigerant filling: The filling amount of the unit should be calculated strictly according to the nameplate requirements and the length of the connecting pipeline between the internal and external machines. When filling, it is necessary to accurately measure the filling amount of refrigerant with an electronic scale. Refrigerant is charged into the liquid pipe side in the form of liquid, and the electronic scale is observed until the required amount is charged. If you can't add the system without turning it on, let the system run at full cooling load, and charge the refrigerant into the air pipe side in the form of gas, and observe the electronic scale until the required amount is charged.
8. Trial operation: restore the electric heating belt, temperature sensor and other electrical components of the compressor to their original positions. Restore the power supply and ensure that the equipment is well grounded. And gently push the compressor to see if it is reversed. Start the trial run. Listen to whether the compressor and fan have abnormal sound, whether the air conditioning modes are operating normally, and whether the unit current is within a reasonable range. After everything is normal, the unit maintenance is completed.
That's what Bian Xiao brought you. What is an air conditioning compressor? The whole content of the replacement method of air conditioning compressor.