The influence of temperature on refrigeration compressor
Influence of exhaust temperature
In summer, the discharge temperature of the compressor is relatively high and cannot be touched by hands. According to national standards, the exhaust temperature of the R22 refrigeration system should not exceed 150 degrees Celsius. It is an abnormal condition if it exceeds this temperature line. The reason for the excessively high exhaust temperature is the excessively high suction temperature of the compressor or the excessively high condensing temperature, so attention must be paid. The exhaust temperature is too low, and the exhaust pipe is not hot when touching the exhaust pipe by hand. This indicates that the suction temperature is extremely low, and the compressor may be running in a wet stroke or in a running state with relatively little system working fluid. The wet stroke of the compressor is easy to damage the valve structure; the refrigerant runs in very rare conditions, which will affect the heat dissipation of the motor windings and accelerate the aging of the insulating material.
The effect of housing temperature changes on the compressor and refrigeration system
The temperature field of the casing of the fully enclosed reciprocating piston compressor can be divided into two parts: a. The upper casing is affected by the inhaled vapor, and the temperature is relatively low, and it is in the slightly hot or slightly cooler range. There may be dew condensation on the surface of the casing around the pipe. B. The heat generated by the motor in the lower casing and the frictional heat carried by the refrigerating oil are mainly carried out of the casing by steam.
1) The influence and cause of the case temperature is too high
The surface temperature of the case exceeds the normal range, mainly because the suction temperature of the refrigeration system is too high (above 15 degrees Celsius). Excessively hot steam enters the compressor and absorbs the heat in the casing to make the temperature of the steam higher, thereby increasing the temperature of the casing. The temperature of the superheated steam rises very high, and the temperature of the casing also rises very high, which is not good for the cooling of the oil. This will affect the lubrication of the moving parts, accelerate the wear, and cause the bearing to seize (seize) in severe cases. It will also cause the exhaust temperature to rise.
2) The influence and reason of the case temperature is too low
The surface temperature of the case is lower than the normal range because the suction temperature is too low (below 15 degrees Celsius). It is beneficial to the cooling of refrigerating oil and motor windings, but the cooling capacity has decreased. When the suction temperature is particularly low, most of the casing will be condensed, and there is a danger of liquid shock. This is a fatal blow to the compressor and special attention should be paid. At the same time, a large amount of refrigerant is dissolved in the refrigerating oil, which is not conducive to the lubrication of moving parts.
Generally, consumers use hand feel to detect the temperature of a semi-hermetic refrigeration compressor because it is not very convenient to use a thermometer. If an abnormal temperature is found in the use of a semi-hermetic refrigeration compressor, it needs to be dealt with in time.
