The determination of the invisible fault of the screw air compressor computer excludes the technician of the air compressor station of the former Xianyou Northwest Cotton Group Co., Ltd., Xianyang 712000, Shaanxi, China. The Atlas Copco Company, which was put into operation in early 1990, manufactured the New Type 451 two-stage compression. The oil screw air compressor is stable and stable after 16 years of operation. The structure of the machine is compact, the maintenance is convenient, and the failure rate is relatively low. However, as the age of use increases, some invisible faults will occur from time to time, and it is difficult to determine the exclusion. For example, in 2006, we checked in the work, and the judgments of the special faults found in the case were exceptionally concealed and difficult to find.

1 failure phenomenon I air compressor station 3 air compressor computer display intermediate cooler pressure is only 1.213; obviously the aircraft is in abnormal operation. Before the failure, the electric raft 1 showed a small room cooler pressure of 2. Hunger.

Left and right, the other technical parameters show no significant changes in the technical parameters before the occurrence of the fault, and can basically be judged as normal.

2 Reason analysis and inspection According to the technical manual provided by the equipment manufacturer and our work experience analysis, the possible causes of the failure are as follows: 2.1 Air inlet filter is blocked. The computer display filter pressure difference is 1591. ; greatly lower than the set limit of 0.441, and the warning light is not shelled. In order to confirm the replacement of the new filter test, the fault remains the same.

2.2 Intercooler safety valve leakage After careful inspection of the machine intercooler safety valve, no leakage run phenomenon was found.

2.3 There is air leakage at the gasket on the pipeline between the low pressure and high pressure air compressor. After repeated inspection, no air leakage is found.

The repair time is on the circulating water inlet pipe line, and a pressure switch is added. When the circulating water pressure is lower than 0.38, the alarm will be issued, so that the operator can, and the 4 production schedule is adjusted to adjust the circulating water pressure.

Improve the upstream cooling system of circulating hydrogen to ensure that the hydrogen into the compressor temperature does not exceed the design. When the weather is hot and the ambient temperature is high, we can increase the circulating hydrogen into the compressor by increasing the air-cooling fan of the reaction product. The degree is lower than that of the inspection according to the inspection and maintenance procedures to ensure the quality of maintenance.

After a period of observation, it was found that the quality of the overhaul machine determines the quality of the compressor hall. Therefore, when the compressor is overhauled, we communicate with the maintenance fitter in time to explain the structure and function of the accessories. After communicating with the fitter, they understand the importance of the quality of the repair. During the overhaul, the maintenance procedures were carefully followed, which greatly improved the quality of maintenance and improved the continuous running time of the compressor to about 6 months.

Wear and failure are set for a certain period of time. After a period of observation, we decided that when the compressor runs for 6000! Check and replace the piston ring of the compressor.

It is required to discharge the liquid dispensing tank in time when the compressor is operated.

When the pressure difference between the front and rear of the compressor inlet filter is greater than 0.2 and 1, the cleaning of the inlet filter, 4 improved efficiency, mining, after the above measures, the compressor exhaust temperature is often too high to solve the problem. In actual operation, the exhaust gas temperature is lower than 100, and the service life of the suction and exhaust valves of the key consumable parts of the compressor has been replaced. Now, even the failure rate of the purely running three left-thousand-shrinking machines has been noticeably lowered. Greatly reduced the maintenance cost of the compressor, the reason for the frequent jumps of the Ingersoll Rand air compressor. Li Juan Henan Province Zhongyuan Dahua Group Co., Ltd. Polyamine Company, Henan Fuyang 4570441 Working principle and characteristics Screw compressor is the use of yin and yang The rotors mesh with each other and rotate at a high speed to produce a volume change, thereby obtaining compressed air at a rated pressure.

The screw air compressor has the following characteristics: Due to the high-speed rotation of the screw-compressor yin and yang rotors, each compression chamber is exhausted at the rotation circumference, and its exhaust frequency is very high, reaching 15202500 servant exhaust with almost no pulsation; screw compressor movement The parts are few, only the yin and yang rotors make a rotary motion, so the damage parts are small, the reliability is reliable, the screw compressor is easy to maintain, and the air filter oil filter oil separator is regularly maintained, which is light in weight and easy to remove. The components are not matched with the accuracy requirements. The maintenance cycle can be up to the control system. The screw compressor is unattended design and its operation is fully automated. From the perspective of equipment installation, the screw compressor adopts the overall box type, and the operation process is not Unbalanced force, so you don't need a big foundation, you can put it on the ground.

From the principle of the screw compressor, the exhaust gas quality test runs the efficiency of the running parts, the reliability of the operation of the equipment, the advancement of the installation and maintenance convenience. Screw compressors are superior to piston compressors. This is also the root cause of the screw compressor, the generation of live compressors.

2.4 The pipe between the intercooler and the unloader or the low-pressure balance piston has a leak or breakage. The throttle valve is not fully open. The compressed air leaks through the high-pressure unloading valve. After repeated inspection, the intercooler and the unloader or the low-pressure balance piston are found. There is a broken air leak between the tubes. At the same time, we also removed the 7 unloader assembly and carried out, checked, and repeatedly pushed the smashing piston by hand, the operation was flexible, the leather cap was intact, and the throttle valve plate was opened and lived.

2.5 The damage to the tube leading to the 18 intercooler pressure sensor is checked by the checker without damage and leakage.

2.618 Pressure sensor failure Replace the new sensor test, the fault remains.

2.7 The low-voltage rotor is not working properly. The machine was just replaced on May 3, 2006, after the replacement of the high and low voltage, and the sound was not abnormal. And running smoothly. The possibility of low-voltage rotor failure can be ruled out by experience.

3 Fault handling According to the above analysis, it is known that the above reasons are excluded. Only the computer may be suspected. Then we removed the 3 computer and exchanged it with the computer, and then started to observe it! The computer display 1 is the same as the data displayed by the computer before the failure of the machine, and the fault phenomenon completely disappears. The computer intercooler pressure term transferred to the 3 machine is significantly smaller than 1.2. The other technical parameters are normal, and it is also the same as the machine exchange, which is also the same. It can be determined that the computer system is partially faulty, resulting in the distortion of the display parameters. , replace the computer, the machine resumes normal operation.

4 knot, the language through the air compressor due to local failure of the brain caused by some of the technical parameters of the distortion of the soft fault phenomenon, under normal circumstances is difficult to judge and find, here we use the exclusion method to eliminate the final inference may be broken Due to the obstacle, we get the following!

Due to the compact design of this type of screw air compressor, it is extremely hot in the course of its operation, especially in the summer. The position of the computer is close to the body, often working at high temperatures. In addition, the computer has been used for a long time, and some components slowly begin to age. It often happens that computer-like distortion and misjudgment even lead to downtime and other phenomena deserve attention.

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