罗茨风机经过日常维护检修，检修内容包括：轴承、油封更换，联轴器柱销更换，转子轴肩检查、刷镀（在合格范围，可不进行），转子动平衡，密封衬套、密封环清理检查，回装，转子间隙调整在合格范围内。罗茨风机空载运行正常，但带载后异响，以下为重点排查方向：

　　The Roots blower undergoes daily maintenance and repair, including replacement of bearings and oil seals, replacement of coupling pins, inspection and brushing of rotor shaft shoulders (within the qualified range, optional), rotor dynamic balancing, cleaning and inspection of sealing bushings and rings, reinstallation, and adjustment of rotor clearance within the qualified range. The Roots blower is running normally without load, but there is abnormal noise after being loaded. The following are the key troubleshooting directions:

　　1. 叶轮与机壳间隙异常（核心怀疑点）

　　1. Abnormal clearance between impeller and casing (core suspicion point)

　　冷态间隙过小：

　　Cold state gap too small:

　　手动盘车，偏紧的话可能是叶轮与机壳静态间隙过小（低于0.3mm），空载时勉强运转，带载后受热膨胀或气流推力导致叶轮位移，直接与机壳碰磨。

　　If the manual turning is too tight, it may be due to the static clearance between the impeller and the casing being too small (less than 0.3mm). When operating under no-load conditions, the impeller may experience displacement due to thermal expansion or airflow thrust after being loaded, resulting in direct friction with the casing.

　　处理：

　　handle:

　　停机冷却后，用塞尺测量叶轮与机壳的径向、轴向间隙（需按厂家标准，通常径向0.4-0.6mm，轴向0.3-0.6mm），同时还需测量转子之间的间隙，包括转子垂直间隙和转子平行间隙；若间隙过小，调整机壳定位销或垫片厚度或调整同步齿。

　　After the shutdown cooling, measure the radial and axial clearances between the impeller and the casing with a feeler gauge (according to the manufacturer's standard, usually 0.4-0.6mm in the radial direction and 0.3-0.6mm in the axial direction). At the same time, measure the clearances between the rotors, including the vertical clearance and parallel clearance of the rotors; If the gap is too small, adjust the thickness of the casing positioning pin or gasket or adjust the synchronous teeth.

　　叶轮轴弯曲/变形：

　　Bending/deformation of impeller shaft:

　　动平衡合格仅说明质量分布均匀，但若轴轻微弯曲，带载时受力变形会导致周期性摩擦。

　　The qualified dynamic balance only indicates that the mass distribution is uniform, but if the shaft is slightly bent, the deformation under load will cause periodic friction.

　　处理：

　　handle:

　　拆卸叶轮，用百分表测量轴的径向跳动（允许值一般≤0.05mm）；若超差，需校直或更换转子。

　　Disassemble the impeller and measure the radial runout of the shaft with a dial gauge (allowable value generally ≤ 0.05mm); If it exceeds the tolerance, it is necessary to straighten or replace the rotor.

　　2. 齿轮啮合异常（需拆检验证）

　　2. Abnormal gear meshing (requires disassembly and verification)

　　齿轮副装配问题：

　　Gear pair assembly issues:

　　更换轴承或油封时，若齿轮箱拆装后未精确复位，可能导致齿面接触不良或齿隙不均（标准齿隙0.1-0.3mm）。

　　When replacing bearings or oil seals, if the gearbox is not accurately reset after disassembly, it may result in poor tooth contact or uneven tooth clearance (standard tooth clearance 0.1-0.3mm).

　　处理：

　　handle:

　　拆开齿轮箱盖，用压铅法或塞尺测量齿隙；检查齿面是否有偏磨、点蚀（如有需更换齿轮）。

　　Remove the gearbox cover and measure the backlash using lead pressure or a feeler gauge; Check for eccentric wear and pitting on the tooth surface (if necessary, replace the gear).

　　同步齿轮轴向定位偏差：

　　Axial positioning deviation of synchronous gear:

　　轴承更换后若锁紧螺母未拧到位，齿轮轴向窜动会引起啮合错位，带载时异响明显。

　　If the locking nut is not tightened properly after bearing replacement, the axial movement of the gear will cause meshing misalignment, and there will be obvious abnormal noise under load.

　　处理：

　　handle:

　　检查齿轮轴向固定螺栓和锁紧螺母的预紧力；确保齿轮轴向游隙≤0.05mm。

　　Check the pre tightening force of the gear axial fixing bolts and locking nuts; Ensure that the axial clearance of the gear is ≤ 0.05mm.

　　3. 联轴器对中不良（隐藏风险）

　　3. Poor alignment of the coupling (hidden risk)

　　对中误差未消除：

　　The center error has not been eliminated:

　　仅更换柱销无法解决对中问题，负载时扭矩传递导致偏差放大，引发振动异响。

　　Simply replacing the column pin cannot solve the alignment problem, as torque transmission during loading causes deviation amplification and leads to vibration and abnormal noise.

　　处理：

　　handle:

　　使用激光对中仪重新校准联轴器（径向/轴向偏差≤0.05mm）；检查地脚螺栓是否松动，底座是否水平。

　　Use a laser alignment instrument to recalibrate the coupling (radial/axial deviation ≤ 0.05mm); Check if the anchor bolts are loose and if the base is level.

　　4. 密封件安装过紧（摩擦阻力）

　　4. Tight installation of seals (frictional resistance)

　　油封预紧力过大：

　　Excessive pre tightening force of oil seal:

　　新换油封若安装时过度压紧，会导致轴与密封件摩擦阻力增大，空载尚可运行，带载后摩擦加剧产生异响。

　　If the newly replaced oil seal is excessively tightened during installation, it will cause an increase in frictional resistance between the shaft and the seal, which can still operate under no-load conditions. However, after being loaded, friction will intensify and produce abnormal noise.

　　处理：

　　handle:

　　检查轴与油封接触面是否有过热发蓝痕迹；重新安装油封，确保轴向压力均匀（可涂抹润滑脂减少摩擦）。

　　Check whether there are signs of overheating and bluing on the contact surface between the shaft and the oil seal; Reinstall the oil seal to ensure even axial pressure (lubricating grease can be applied to reduce friction).

　　轴承座压板接触：

　　Bearing seat pressure plate contact:

　　在轴承座回装过程中，压板安装错误，出现重叠部分，首次空载时可运行，带载后轴向力增大，将产生异响，此时再次空载，异响不会消失。

　　During the reinstallation process of the bearing seat, the pressure plate was installed incorrectly, resulting in overlapping parts. It can be operated under no-load for the first time, but when loaded, the axial force increases, causing abnormal noise. At this time, when unloaded again, the abnormal noise will not disappear.

　　处理：

　　handle:

　　检查轴承座压板是否有重叠部分；轴承外圈是否干净，压板翘起的一面轴承外圈会存有油，压实的则不会。

　　Check if there are overlapping parts on the bearing seat pressure plate; Is the outer ring of the bearing clean? The raised side of the pressure plate may contain oil on the outer ring of the bearing, but if it is compacted, it will not.

　　5. 系统气动问题（需排除背压异常）

　　5. Pneumatic issues with the system (excluding abnormal back pressure)

　　出口管路设计缺陷：

　　Defects in export pipeline design:

　　若管路存在急弯、缩径或消音器堵塞，带载时气流脉动频率与风机激发频率共振，产生气动噪声。

　　If there are sharp bends, reduced diameters, or blocked silencers in the pipeline, the pulsating frequency of the airflow under load will resonate with the excitation frequency of the fan, generating aerodynamic noise.

　　处理：

　　handle:

　　检查管路压力是否异常波动（安装压力表监测）；在风机出口加装柔性膨胀节或调整管路布局；检查出口单向阀是否可正常启闭；出口消音器是否内部异物或损坏。

　　Check for abnormal fluctuations in pipeline pressure (install pressure gauges for monitoring); Install flexible expansion joints or adjust pipeline layout at the outlet of the fan; Check if the one-way valve at the outlet can be opened and closed normally; Is there any foreign object or damage inside the outlet muffler.

　　排查步骤优先级建议

　　Suggestions for prioritizing troubleshooting steps

　　紧急停机检查：

　　Emergency stop inspection:

　　拆卸进出口管道，手动盘车感受阻力是否均匀，定位摩擦点；

　　Dismantle the import and export pipelines, manually rotate the disc to check if the resistance is uniform, and locate the friction points;

　　测量叶轮静态间隙，对比厂家标准。

　　Measure the static clearance of the impeller and compare it with the manufacturer's standard.

　　齿轮箱开盖检查：

　　Gearbox cover opening inspection:

　　检查齿面接触痕迹（正常应居中无偏磨），测量齿隙。

　　Check the contact marks on the tooth surface (normally centered without eccentric wear), and measure the tooth clearance.

　　联轴器对中复测：

　　Coupling centering retest:

　　使用专业工具校准，确保对中精度

　　Use professional tools for calibration to ensure alignment accuracy

　　若上述排查仍未解决，需考虑机壳变形（长期运行热应力导致）或材料疲劳（叶轮微观裂纹），建议进行三维坐标检测或渗透探伤或返厂维修。

　　If the above investigation still does not solve the problem, it is necessary to consider the deformation of the casing (caused by long-term operation thermal stress) or material fatigue (micro cracks in the impeller). It is recommended to perform three-dimensional coordinate testing or penetrant testing or return to the factory for repair.

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