1. Oil leakage at the compressor end of the turbocharger caused by oil and gas accumulation at the outlet of the pressure shell: Check the turbocharger and confirm that it is a qualified product. Generally, the use of the turbocharger can be analyzed. If the environment is dusty and causes the air filter to block, resulting in a negative pressure of over 5.5kPa, it will cause oil leakage at the compressor end of the turbocharger; When a car is driving down a steep slope in a mountainous area, the biogas generator set will drive at a low speed without refueling for more than 15 minutes. If the gas seal cannot be established on the back of the medium pressure impeller of the turbocharger, forming a vacuum, it can also cause oil leakage at the compressor end of the turbocharger. As long as the air filter is regularly maintained, the idle 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. Excessive oil pressure can cause oil leakage in the supercharger: Excessive inlet oil pressure in the supercharger of biogas generator sets is also one of the reasons for oil leakage in the supercharger. When we confirm through inspection that the turbocharger is a qualified product and find that the oil pressure of the biogas generator set is much higher than the specifications in the manual, we need to check the lubrication system of the biogas generator set, whether the pressure regulating valve is stuck or malfunctioning, and if the oil pressure of the biogas generator set is normal, the oil leakage of the turbocharger 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 in the supercharger: The oil return of the supercharger of a biogas generator set is returned from the supercharger oil return pipe to the biogas generator set by the weight of the oil. If there is a contraction or blockage in the oil return pipe, the oil return of the supercharger will not be smooth, and oil leakage will occur at both ends of the supercharger. It should be ruled out that the oil return is not smooth, and the fault can be eliminated even if the turbocharger is intact.

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 stopping and starting of biogas generator units during construction: Frequent stopping and starting 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 intermediate shell oil return chamber, causing the turbocharger oil return chamber to shrink and the oil return is not smooth, resulting in oil leakage. It is necessary to check the integrity of all vulnerable parts 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. Severe gas leakage in the biogas generator unit can cause poor oil return of the turbocharger and oil leakage from the turbocharger. Some turbochargers have found oil leakage, even at both ends. After inspection, the turbocharger is qualified and the oil inlet and return are normal. After disassembly and inspection, it was found that there are thick oil stains and some hardening in the middle section of the turbocharger's main shaft. After cleaning, it was found that the middle section of the main shaft has turned pale yellow and there are also oil stains in the turbocharger's oil return pipe, From the above phenomenon, it can be inferred that the gas leakage of the biogas generator unit causes poor oil return of the turbocharger. Replace the four matching biogas generator sets to eliminate gas leakage from the biogas generator set, clean the turbocharger and return oil pipe, and eliminate the fault.