Excessive temperature rise is a common fault in the operation of screw air compressor, screw air compressor is always running at high temperature, which will seriously affect the exhaust volume and service life of the machine. When the temperature rise is too high, high temperature shutdown failure will occur. The causes are:

1. Temperature sensor failure. Failure of the temperature sensor will cause the PLC to falsely report that the temperature is too high, causing a shutdown.

2. Ambient temperature factors. The screw air compressor head outlet temperature is usually set at about 110°C, while the head outlet temperature is equal to the ambient temperature plus 60°C. The temperature of the head outlet is equal to the ambient temperature plus 60°C. Pit ventilation environment is poor, most of the high temperature is caused by this.

3. Temperature control valve failure. Temperature control valve in the compressor cold start, can make the oil bypass the cooler directly into the main head, accelerate the rise in oil temperature, to prevent condensation in the compressor, in the compressor after normal operation, according to the oil temperature can be adjusted to flow through the cooler and the ratio of the oil volume of the evening road, to control the temperature of the oil injection. If the temperature control valve is damaged or the action is not sensitive, it will make a large number of high-temperature oil without the cooler directly circulating into the host head, resulting in high host temperature.