supermarket refrigerated showcase » article > display freezer > The blow-in and air-tightness of the walk-in cooler refrigeration system
The blow-in and air-tightness of the walk-in cooler refrigeration system
The blow-in and air-tightness of the walk-in cooler refrigeration system
After the blow-in refrigeration system is installed, it is inevitable that there will be welding slag, rust, oxide scale and other impurities in the system. If it is not cleaned up, impurities will damage the valve core when the refrigeration device is running; passing through the cylinder, the mirror surface of the cylinder will be roughened; passing through the filter, the filter will be blocked. For this reason, the system must be blown carefully before trial operation of the refrigeration device. Generally, 0.5-0.6MPa compressed air or nitrogen is used for blowing pollution. In situations where there is no compressed air or nitrogen, a refrigeration compressor can also be used instead, but the discharge temperature of the refrigeration compressor should not exceed 125°C during use, otherwise it will reduce the viscosity of the lubricating oil and cause damage to the moving parts of the compressor. The blow-in of the walk-in cooler system should be carried out in stages. The high-pressure system should be blown first, followed by the low-pressure system. The lower part of the sewage outlet should be selected respectively. Put a piece of clean white paper on the drain outlet. When there is no stain on the paper, it can be considered that the system has been blown clean. In addition, when the refrigeration system is overhauled, it is also necessary to use compressed air to blow off the remaining oil and impurities in the system. In order to dissolve the greasy dirt and facilitate its discharge, pour an appropriate amount of trichloroethylene into the system, and blow the dirt into the air after the greasy dirt is dissolved. Ethylene trioxide is harmful to the human body. Therefore, please pay attention to indoor ventilation when using it and keep the operator away.
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