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The reason why the refrigerator does not cool Refrigeration compressor purchase What is the reason why the refrigerator compressor heats and does not cool Refrigeration compressors are divided into several categories according to the working principle What are the requirements for refrigeration compressor installationThe working principle of piston compressor
Working principle of piston compressor First, the working principle of the compressor
When the crankshaft of the piston compressor rotates, the piston will reciprocate through the transmission of the connecting rod, and the working volume composed of the inner wall of the cylinder, the cylinder head and the top surface of the piston will periodically change. When the piston of the piston compressor starts to move from the cylinder head, the working volume in the cylinder gradually increases. At this time, the gas follows the intake pipe and pushes the intake valve to enter the cylinder until the working volume reaches the maximum , The intake valve is closed; when the piston of the piston compressor moves in the reverse direction, the working volume in the cylinder shrinks and the gas pressure increases. When the pressure in the cylinder reaches and is slightly higher than the exhaust pressure, the exhaust valve opens and the gas exits the cylinder Until the piston moves to the limit position, the exhaust valve closes. When the piston of the piston compressor moves again in the reverse direction, the above process repeats itself. In short, the crankshaft of the piston compressor rotates once, and the piston reciprocates once, and the intake, compression, and exhaust processes in the cylinder are successively completed, that is, a working cycle is completed. Second, the refrigeration process of the piston compressor
The refrigeration process is carried out in a closed closed system composed of ammonia compressor, cooler, regulating valve, evaporator, etc. After the ammonia liquid passes through the regulating valve to reduce the pressure and enter the evaporator, it absorbs the heat of the cooled medium and evaporates, so that the temperature of the medium Reduced to achieve the purpose of refrigeration; the evaporated ammonia gas is sucked back by the compressor and discharged into the cooler through compression, so that the ammonia gas cools down and condenses into ammonia liquid, and then enters the evaporator through the regulating valve to evaporate, so the cycle is repeated to achieve refrigeration the goal of. Piston compressor operation rules 1. Lubricating oil for air compressors is generally high in oil quality and contains oxidizing additives. It is not easy to be oxidized and deteriorated, not easy to foam, and has low residual carbon content and high flash point. Common users are:
A, 13" compressor oil (winter oil);
B, 19" compressor oil (summer oil);
2. Please keep the oil level within the red circle in the middle of the oil lens. Too much oil is added to waste the lubricating oil, and it is easy to carbonize the valve. Too little oil is often burned or worn due to poor lubrication. Therefore, the oil level should be kept within the original red range at any time;
3. When the oil color turns black or is contaminated with oil (about every 500 hours), please change the oil once;
4. When changing the oil, please unscrew the oil drain plug under the crankcase first, and use cardboard or other utensils to discharge the dirty oil. After the oil stain is poured out, tighten the oil plug (preferably coat the oil plug teeth) All-purpose glue or anti-leakage paste to prevent oil leakage), add new oil to the middle of the red garden of the island mirror after opening the fuel cap;
5. Please add new oil when running;
6. Avoid concentrated lubricating oil and its miscellaneous waste oil.
Precautions for operation of piston compressor 1. Check each part of the screw or nut for looseness;
2. Is the belt tight?
3. Whether the pipeline is normal and the oil level is appropriate;
4. Whether the wires and electrical switches are in compliance with the regulations and whether the limits are correct;
5. Whether the fulcrum of each caster has been fixed or stable;
6. Compression means that the pulley is easily turned by hand;
7. Before the compressor works, it is best to idle for more than 2 to 3 minutes, and then operate normally;
8. Check whether the running direction is the same as that indicated by the arrow. If it is not the same, please replace any two of the three power supplies with the three-phase motor;
9. Air cleaners should be regularly checked for contamination, and the filter cotton should be removed and cleaned (using gas oil) or replaced frequently to maintain a good air filtration effect;
10. After the daily use of the air compressor, the bucket drain valve should be unscrewed to remove the water and oil condensate accumulated in the bucket and remove it.
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