The company supplies Atlas, Ingersoll Rand, Fu Sheng, Kobelco Sullair, Hitachi and other first-tier brands of air compressor filter (air filter, oil filter, oil and gas separator), air compressor parts, air compressor oil air compressor oil, air compressor supplies, air compressor sales maintenance 

 Ingersoll Rand twin-screw fuel injection air compressor is used on site, displacement of 40m3/min, Model ML-250, the motor power 250KW, supply pressure is 0.7MPa. 

 In July this year, the machine during operation, the host exhaust temperature suddenly appeared 110 ℃, high temperature while jumping machine. Check the hydraulic system without leakage, check the oil and gas separator, the oil is slightly lower than normal, so the fuel to the normal oil level, after the boot light differential host the exhaust gas temperature fluctuates between 90 ℃ ~ 94 ℃, the other everything works normal. About running a week later, the high temperature tripping. Again check the hydraulic system leaks, oil level is normal. For this phenomenon, the thermostatic valve, broken valve oil, and oil cooler to do a comprehensive inspection. Thermostatic valve check: thermostatic valve placed in the temperature of boiling water about 65 ℃, observation found that the thermostatic valve to open, no stuck phenomenon, it is excluded. Off the oil valve solenoid valve check: off the oil valve springs, seals, and valve body parts intact, the bad, the electromagnet core knock hurt stuck coil resistance is normal, so exclude. 

 The oil cooler fouling, clogging, has ruled out the factors of the cooling water and cooling water pressure. This device is with other several devices share the same out of the water pipe to control the amount of water into the export cooling valve check intact, it is excluded. 

 Beating phenomenon frequent host for the machine in operation exhaust temperature between 90 ℃ ~ 94. After the shutdown temperature is still frequent fluctuations. Suspected to host the exhaust temperature sensor. Therefore, replacement of a temperature sensor, start again host the exhaust temperature is still frequent beating between 90 ℃ to 94 ℃, but beating the highest temperature is below 110 ℃ at 6 ℃ high temperature jump machine settings. Therefore, to exclude the temperature sensor. 

 Observed for 3 consecutive days and found no high-temperature jump machine phenomenon in this device. The Host exhaust pressure with the constantly changing, beating between 0.1 ~ 0.4Bar. Infer is due to host the exhaust pressure of frequent changes in host temperature fluctuations. Analyzed as follows: 

 The instability of the host exhaust host of yin and yang between the rotor meshing gap changes caused by the host in the suction, compression, displacement changes the exhaust process, leading to the frequent fluctuation of the exhaust pressure. However, the discharge pressure caused by changes in the host operating cooling fuel instability, and suddenly a small neglect, lack of yin and yang rotor cooling oil in motion hosts high exhaust temperature. For this reason the investigation and confirmed the operation of the host head sound is abnormal, intermittent "could fool, rushing" abnormal sound, based on past experience, the initial judgment before transferred to the bearings are badly worn, and need replaced. This equipment operation time of 31,667 hours, has come to overhaul the maintenance period. Host nose open front bearing sleeve is worn between the ball and within the outer sleeve with too much space. After overhaul, the host re-boot test host passive exhaust pressure narrowed to 0.1 to 0.2Bar between host exhaust gas temperature fluctuation range of IC ~ 3C2 between. Compared to the overhaul, the fluctuation range is decreased. Equipment, continuous operation a week later, again the high exhaust temperature jump machine. Therefore exclude the high exhaust temperature and host exhaust pressure fluctuations associated. 

 Host the beating of the exhaust gas temperature in the end in order to further find out which part, so the temperature compared to the actual measurement of the host of the exhaust gas temperature monitor using the thermometer display. 

 Found by measuring: (choose a total of five measurement points, Table 1) from the above data that: the actual host exhaust temperature display temperature existence of the 1.7 C-3 9 ° C difference △ T. While a host of other equipment exhaust gas temperature display the temperature difference △ T max does not exceed 1 ℃. Infer from another part of the heat to a host of exhaust temperature sensor. The display temperatures in excess of the actual temperature of the host exhaust. 

 Scrutinizing found to control the power supply board, a capacitor exception, its tail exposed part has been split to three parts and the middle part of the bulge. 

 This capacitor in the power supply board work, since in itself has been damaged, itself part of the heat generated by the sensor passed to the control computer parts, making the control computer part of the misconception that host high exhaust temperature and tripping. This component to work slowly to produce heat, a part of dissemination to the outside air, part of the pass control of the computer part. Power board installed in the body of the control cabinet air compressor, there is a big vibration device at runtime, to some extent, to speed up the dissemination of the capacitor to generate heat, the heat generated can not pass the control computer, which leads to the display frequent hosts on the exhaust gas temperature fluctuations. With the passage of time more and more heat generated by the capacitor, when set in the control computer 110 ℃, the machine will automatically jump to the machine. Capacitor generated heat to the part of the sensor temperature reaches 8 ℃, 7 days (168 hours), this is the equipment after the shutdown, until the bulk capacitor to produce the heat lost to restart to run continuously for a week or so, the machine repeated high temperature jump machine. 

 Precaution 

 This infrequent failure of electronic components, make regular checks in the usual routine maintenance to improve the efficiency of maintenance and ensure that the machine reliability. 

 Summarize the reasons for the high exhaust gas temperature of the air compressor host is multi-faceted, having problems to a comprehensive analysis of cool thinking. The power board is relatively rare reason, has given concealed. Encountered a similar problem did not identify the main reason one by one problem point for investigation, especially their uncertainties can be used comparative law analysis (ie with good components, or the normal operation of equipment), replace method (ie replacing suspected components) with a good component for authentication, be ruled out.