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、机油压力过高会引起增压器漏油：沼气发电机组增压器的进油压力过高也是引起增压器漏油的原因之一。当我们经检查确认增压器是合格品，而又发现沼气发电机组的机油压远高于说明书的规定，则要检查沼气发电机组的润滑系统，调压阀是否卡死或失灵，沼气发电机组的机油压力正常了，增压器的漏油即可排除。

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、回油不畅会造成增压器漏油：沼气发电机组增压器的回油是靠油的自重从增压器回油管回入沼气发电机组中，如果回油管出现缩节和阻塞，增压器的回油不畅，增压器会出现两端渗漏机油。应排除回油不畅，在增压器完好的情况下，故障也即排除。

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、沼气发电机组在施工中频繁停车起动：沼气发电机组在施工中频繁停车起动，会引起增压器中间壳涡轮端结焦；同时引起中间壳回油腔结焦，使增压器回油腔缩小回油不畅产生漏油，应检查各易损件是否完好，并清除结焦。

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、沼气发电机组窜气严重会造成增压器的回油不畅、增压器漏油：有些增压器发现漏油甚至两端漏油，经检查增压器是合格品，进油回油也正常，再进行拆检发现增压器主轴中段有很厚的油垢还有些发硬，铲除清洗后发现主轴中段变淡黄色且增压器回油管中亦有油垢，从以上现象可以判断为沼气发电机组窜气引起增压器的回油不畅。更换沼气发电机组四配套排除沼气发电机组下窜气，对增压器、回油管进行清洗，故障即可排除。

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.