1. Oil leakage at the compressor end of the supercharger caused by oil and gas accumulation at the pressure housing outlet: Check the supercharger and confirm that the supercharger is a qualified product. Generally, it can be analyzed from the use of the supercharger. If the dust in the operating environment is large, causing the air filter to block and causing a negative pressure of over 5.5kPa, it will cause oil leakage at the compressor end of the supercharger; When a car is driving down a steep slope in a mountainous area, the biogas generator unit will drive at a low speed for more than 15 minutes without the fuel filler door. Failure to establish a gas seal on the back of the medium pressure impeller of the supercharger to form a vacuum can also cause oil leakage at the compressor end of the supercharger. As long as the air filter is regularly maintained, the idling time of the biogas generator set should not be too long, and this false oil leakage phenomenon can be eliminated.

2. High oil pressure can cause oil leakage in the supercharger: High oil inlet pressure in the supercharger of biogas generator sets is also one of the reasons for oil leakage in the supercharger. When we confirm that the supercharger is a qualified product through inspection and find that the oil pressure of the biogas generator unit is much higher than the specification, we should check whether the lubrication system of the biogas generator unit and the pressure regulating valve are stuck or malfunctioning. If the oil pressure of the biogas generator unit is normal, the oil leakage from the supercharger can be eliminated.

 

3. Poor oil return can cause oil leakage from the supercharger: The oil return from the supercharger of a biogas generator unit is returned from the supercharger oil return pipe to the biogas generator unit by the weight of the oil. If the oil return pipe is shrunk or blocked, the oil return from the supercharger is not smooth, and oil leakage occurs at both ends of the supercharger. It should be ruled out that the oil return is not smooth, and if the supercharger is intact, the fault should be eliminated.

 

4. Frequent shutdown and startup of biogas generator units during construction: Frequent shutdown and startup of biogas generator units during construction can cause coking at the turbine end of the turbocharger intermediate casing; At the same time, it causes coking in the oil return cavity of the intermediate housing, which causes the oil return cavity of the supercharger to shrink and the oil return is not smooth, resulting in oil leakage. It is necessary to check whether all vulnerable parts are in good condition and remove coking.

 

5. Serious gas channeling in biogas generator units can cause poor oil return from the supercharger and oil leakage from the supercharger: Some superchargers have found oil leakage, even at both ends. Upon inspection, the supercharger is qualified, and the oil inlet and return are also normal. After disassembly and inspection, it is found that there are thick oil stains and some hardening in the middle section of the supercharger's main shaft. After cleaning, it is found that the middle section of the main shaft turns pale yellow and there are also oil stains in the supercharger's oil return pipe, From the above phenomenon, it can be judged that the blowby of the biogas generator unit causes the oil return of the supercharger to be blocked. Replace the four matching biogas generator sets to eliminate the downward blowby of the biogas generator set, and clean the supercharger and oil return pipe. The fault can be eliminated.