One application of Roots vacuum pump in refrigerator maintenance is to use vacuum pump to empty the refrigerator, which is the most effective method. Roots vacuum pump is used in the maintenance of refrigerator, which provides the basis for the vacuum pumping of vacuum pump. Using vacuum pump to repair refrigerator has two functions: one is inflation pressure, which is to leak refrigeration system; the other is vacuum cleaner, which is to prepare for refrigerant injection. That’s why roots vacuum pumps are needed in refrigerators.
How to use roots vacuum pump to vacuum refrigerator?
First, start the refrigerator’s own compressor until the compressor reaches a certain temperature, and feel the heat by hand. Then stop (or not stop). The vacuum pump or maintenance compressor is piped to the process pipe and vacuum is started. For about half an hour, use the lighter light to align with the exhaust port of the maintenance compressor. If the flame is stable, the vacuum in the system can be considered to meet the requirements. Then stop the suction and close the three-way valve. Screw off the pipette and repair the compressor connector, connect the fluorine bottle and fill the system with a small amount of refrigerant. Close the three-way valve. Start your own refrigerator compressor for a few minutes. Then connect the filling pipe to the suction end of the maintenance compressor, open the three-way valve, and then evacuate. It takes about half an hour to completely remove air and water from the system. The refrigerant can then be charged as usual.
How it works: we know that the evaporation rate of water is related to pressure and temperature. The evaporation rate is faster at lower pressure and higher temperature. Due to the high humidity in summer, when the air is used to pressurize the refrigerator, water will enter the system. When vacuumizing, the compressor will start to use the heat generated by the compressor to heat the water in the system to accelerate evaporation. At this point, it is easier to pump water from the vacuum. General maintenance compressor is used in refrigerator, its power is limited, and it is difficult to get ideal vacuum. If the system is filled with a small amount of refrigerant or the roots vacuum pump is used near the ideal vacuum pump, the refrigerant in the system may be much larger than the ratio of water to air. It can easily extract air and water to make the vacuum in the system meet the requirements.
Roots pump water ring pump device is widely used in vacuum system of chemistry, food sublimation and high altitude simulation test. This kind of combination unit can be divided into the following types: Roots pump water ring pump; roots pump water ring pump atmospheric pump unit; roots pump water ring pump parallel mechanical vacuum pump.
The importance of Roots vacuum pump in refrigerator maintenance lies in whether it can maintain the most favorable vacuum, which is the standard to measure the operation of vacuum equipment and has a great impact on the safety and economy of refrigerator. When the condensing equipment is running, if the roots vacuum pump is not tight, the air will leak and the vacuum degree will be reduced. At the same time, the partial pressure of air increases. Since the solubility of air is proportional to its partial pressure, more air is dissolved in water and the oxygen content of the condensate increases.
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