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The reason for the lack of oil in the compressor of the Ozone aging test chamber

The reason for the lack of oil in the compressor of the Ozone aging test chamber

We know that the Ozone aging test chamber also needs to install a refrigeration compressor. If the Ozone aging test chamber compressor is short of oil, it will affect the normal operation of temperature and humidity. In severe cases, the compressor will be stuck or the compressor will be worn out. , then what is the reason for the lack of oil in the Ozone aging test chamber compressor?


Ozone aging test chamber compressor lacks oil due to foaming during compressor shutdown:


The refrigerant oil in the Ozone aging test chamber compressor is more or less miscible with the refrigerant gas, and this miscibility is related to pressure and temperature. According to the principles of thermodynamics, it is well known that a gas can transfer from the hottest place to the coldest place in the system. During shutdown, the compressor is the coldest part in the system. Therefore, after the oil is fully saturated, the refrigerant will sink to the bottom of the compressor casing. The consequence will be wear or seizure of compressor parts.


The second situation is due to the poor oil return of the compressor of the Ozone aging test chamber, which leads to the lack of oil in the compressor:


A small portion of the oil is mixed with the refrigerant gas and circulated in the system. In order to avoid the accumulation of oil in the system and ensure the maximum flow rate of refrigerant circulation in the pipeline. It is generally believed that it is permissible for the oil-gas mixture to circulate in the system with a mass flow rate of refrigerant gas below 1%. For example, a 1.5HP compressor might have 1 kg of oil circulating per hour, which means 1.2 times the oil charge is circulating through the system. The compressor manufacturer selects and certifies certain refrigeration oil in order to obtain good mutual solubility between refrigerant and oil. However, the mechanical design must provide good oil return to the compressor with the minimum refrigerant gas flow rate, that is, the pipe size, especially the suction pipe size, must be carefully selected. That is, the diameter of the pipe must be balanced between pressure drop and good oil return.

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When the compressor starts, the suction pressure drops, so that the refrigerant in the oil can be decomposed, or the refrigerant sinking at the bottom of the compressor shell evaporates from the oil, bringing out a large amount of oil. At this time, the compressor casing is quickly filled with foam (a mixture of oil and refrigerant), which is sucked through the cylinder and flows out of the compressor. The full amount of oil can flow out of the compressor within seconds. So even if the system is well designed, if the press cannot return oil, its mechanical parts will wear out badly.


Therefore, when the Ozone aging test chamber compressor is short of oil, the user needs to find out in time and replenish the special refrigeration oil for the compressor in time to avoid unnecessary failures and maintenance due to the lack of oil in the compressor. How to find out if the Ozone aging test chamber compressor is short of oil? When the compressor has abnormal noise or starts frequently, it needs to attract the attention of our users.


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