If the constant temperature and humidity test chamber compressor is short of oil, the result is that the compressor is stuck or early wear occurs. The lack of oil in the compressor can be explained by the following two reasons: 1. The compressor returns to oil is not good; 2. The compressor is foaming during shutdown. (1) The compressor is not good for oil return: A small portion of the oil is mixed with the refrigerant gas and circulated in the system. In order to avoid accumulation of oil in the system and to ensure the maximum refrigerant circulation flow rate in the pipeline. It is generally believed that it is permissible to circulate the oil and gas mixture in the system at a mass flow rate of less than 1% of the refrigerant gas. For example, a 1.5 HP compressor may have a cycle of 1 kg of oil per hour, which means that 1.2 times the amount of oil fill is circulated within the system. The compressor manufacturer selects and certifies certain refrigeration oils in order to obtain good mutual solubility of refrigerant and oil. However, the mechanical design must provide a good return of the compressor with a minimum flow rate of refrigerant gas, that is, the size of the pipe, especially the size of the suction line, must be carefully selected. That is, the diameter of the pipe must be balanced between pressure drop and good oil return. Here we recommend the following minimum refrigerant flow rate: for the horizontal line (and the sloped line) the refrigerant flow rate is 4m/s. The refrigerant flow rate to the rising line is 8m/s. However, the maximum flow rate must be less than 15m/s to reduce the pressure drop and avoid refrigerant flow noise. For pipes less than 30 meters long, there is no need to set a trap. It is recommended to install a horizontal pipe with a downhill slope of 0.8 cm per meter in the direction of refrigerant flow. (2) Foaming during constant temperature and humidity test chamber compressor shutdown The refrigerant oil in the compressor is more or less miscible with the refrigerant gas. This mutual solubility is related to the pressure and temperature. According to the principles of thermodynamics, it is well known that a gas can be transferred from the hottest place in the system to the coldest place. The situation is that during the shutdown, the compressor is the coldest part in the system. Therefore, after the oil reaches full saturation, the refrigerant sinks to the bottom of the compressor casing. The consequence will be that the compressor parts are worn or stuck. This will be further analyzed below. 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 casing evaporates from the oil, bringing out a large amount of oil. At this point the compressor housing is quickly filled with foam (oil and refrigerant mixture) and sucked through the cylinder and out of the compressor. All oil can flow out of the compressor in seconds. Therefore, even if the system design is very good, if the press can not return oil, its mechanical parts will be seriously worn.
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