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Supermarket refrigerated showcase compressor cylinder repair method (three)
supermarket refrigerated showcase compressor cylinder repair method (three)
compressor shell welding method Before reinstalling and sealing, use high-pressure nitrogen to clean the compressor and carefully clean the compressor with gasoline The whole is welded after air drying. Electric welding is generally used for the sealing and welding of compressor shells, because electric welding has high welding strength, less heat influence inside the machine, and fast heat dissipation. Before welding, clean up the impurities caused by repairs. It is best to flush with refrigerated oil. Secondly, install the upper casing of the compressor to the original position according to the mark, and pad the bottom of the compressor on a flat iron plate. The iron plate is in good contact to avoid burning through the shell during welding. Connect the ground wire of the electric welder to the iron plate, adjust the current, use a common electrode, hold the welding clamp in your right hand, and hold the welding cap in your left hand for welding. There are two welding methods, vertical welding and horizontal welding, and the angle of the welding rod must be grasped well during welding. It depends on the installation method of the compressor upper and lower shells. Compressor butt vertical welding operation, the operation starts from the bottom welding of the supermarket refrigerated showcase. Beginners should use the pick-off arc welding method, that is, when the welding rod and the weld are melted into a point, immediately raise the arc (trigger the arc), and wait until it is completely cooled. When the welding rod falls, the second point is fused, and so on, the welding is carried out in three positions, namely, upward, vertical, and flat, until the circumferential welding is completed, and finally the welding slag is removed. If the weld has sand holes or slag inclusions, repair welding should be performed. Compressor butt joint vertical welding operation. Adjust the welding current (slightly larger than vertical welding) using continuous arc welding, that is, after one electrode is welded, use the second electrode to continue welding until the sealing is completed.
The compressor refrigerating oil should be replaced with the same refrigerating oil model, and the injection volume is 3/5 of the original refrigerating oil volume. If you continue to use the original refrigerating oil, the amount of oil must be increased by about 10%, not too much, so as not to hinder heat exchange with the refrigerant entering the refrigeration system. Mixing new and old refrigeration oil is not allowed.
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LAST:Supermarket refrigerated showcase compressor jam cylinder repair method (two) NEXT:After vacuuming, close the high-pressure valve and open the low-pressure valve. The refrigerating oil is pressed into the compressor by atmospheric pressure until it is injected to the requirement.
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