Trouble analysis and troubleshooting methods of industrial chiller compressor hot

In the process of repairing industrial chillers, we often encounter the problem of hot shrinking machines. Today, we will briefly analyze the cause of the formation.

From the analysis of the actual test system, the question of pressure and temperature you mentioned is roughly like this:

1. Too much refrigerant at a certain level causes the exhaust pressure and exhaust temperature to increase;

If the amount of refrigerant reaches a certain level, the exhaust temperature may rise and fall, and the exhaust pressure will continue to rise;

At this time, the suction pressure will increase with the increase of the exhaust pressure;

The evaporation pressure increases, and the corresponding "evaporation pressure corresponds to the saturation temperature" (usually referred to as "evaporation temperature") increases;

Because the amount of evaporation is constant, the flow of refrigerant becomes larger, so the suction superheat of the compressor drops. Industrial chiller is a kind of cooling water equipment that can provide constant temperature, constant current and constant pressure. The temperature of the return water of the chiller should not be higher than 40 degrees. The higher the return water temperature, the greater the damage to the compressor.

The compressor is in an overload operating condition. Industrial chiller is a kind of cooling water equipment that can provide constant temperature, constant current and constant pressure. The temperature of the return water of the chiller should not be higher than 40 degrees. The higher the return water temperature, the greater the damage to the compressor.

Under such conditions, the compressor can easily cause "exhaust pressure maintenance" and "compressor overload maintenance"

2. If there is too little refrigerant, the exhaust temperature will rise, which is caused by the recovery of the suction temperature of the compressor and the increase of the suction overheating;

When the exhaust pressure drops, the corresponding suction pressure will also drop;

The evaporation pressure drops, the corresponding evaporation temperature drops, and the compression oil temperature rises;

Excessive exhaust temperature maintenance easily occurs in this situation. Industrial chillers are used in the cooling of molding molds of plastic processing machinery, which can greatly improve the surface finish of plastic products, reduce surface marks and internal stress of plastic products, make the products do not shrink or deform, facilitate the demolding of plastic products, and accelerate product shaping, thereby Greatly improve the production efficiency of plastic molding machines. The selection of screw chillers should be considered in accordance with the cooling load and usefulness. For refrigeration systems with long periods of time under low-load operating conditions, multi-head plug compressors or screw compressors should be selected for easy conditioning and energy saving.