根据多年经验总结，罗茨鼓风机长时间使用可能出现故障的常见原因主要包括断轴、轴承损坏、机组振动大、转子卡死、轴封泄漏等等。

　　Based on years of experience, the common causes of possible malfunctions in Roots blowers after prolonged use include shaft breakage, bearing damage, high unit vibration, rotor jamming, shaft seal leakage, and so on.

　　1、罗茨鼓风机故障原因分析

　　1. Analysis of the causes of Roots blower malfunction

　　转子与机壳或转子间摩擦是罗茨鼓风机的常见问题，若在运转中显示此问题，可能有着比较严重的机械振动与噪音。罗茨鼓风机经过较长时间停机后，频频出现叶轮卡涩的现象，锦工风机把问题的主要原因梳理为以下几大类。

　　Friction between the rotor and the casing or between the rotors is a common issue with Roots blowers. If this problem is displayed during operation, it may result in severe mechanical vibration and noise. After a long period of shutdown, the Roots blower frequently experiences impeller jamming. Jinggong Fan has classified the main causes of the problem into the following categories.

　　(1)转子分叶、合叶间隙有问题

　　(1) There is a problem with the clearance between rotor blades and blades

　　转子的分叶、合叶间隙有问题，运转中分叶、合叶间隙发生改变。两转子在低速转动的时候会出现撞击，导致转子间摩擦甚至卡阻。

　　There is a problem with the clearance between the rotor blades, which changes during operation. When the two rotors rotate at low speeds, they may collide, causing friction and even jamming between the rotors.

　　一旦运转中出现此机械故障，会使两转子间或转子与机壳出现撞击，发出强力的撞击声；产生振动变大，甚至能引起基础产生振动；同时摩擦部位温度在短时间内升高，甚至出现机壳发热烧红现象。

　　Once this mechanical failure occurs during operation, it will cause a strong impact sound between the two rotors or between the rotor and the casing; Generate increased vibration, and even cause vibration in the foundation; At the same time, the temperature of the friction area rises in a short period of time, and even the casing heats up and burns red.

　　(2)轴承损坏

　　(2) Bearing damage

　　风机运行工况差、油封损坏、装配间隙超标等都会导致轴承损坏，而轴承损坏会造成温度升高，轴承座温度也会增加，严重时会使轴承座变形。

　　Poor operating conditions of the fan, damage to the oil seal, and excessive assembly clearance can all lead to bearing damage. Bearing damage can cause an increase in temperature, and the temperature of the bearing seat can also increase. In severe cases, it can cause deformation of the bearing seat.

　　特别是轴承内外圈抱死时，轴承座与侧盖板受到较大的额外力，温度也会很高，轴承座与侧盖板受热不均，严重时造成侧盖板变形，出现裂纹。

　　Especially when the inner and outer rings of the bearing are locked, the bearing seat and side cover plate are subjected to significant external forces, and the temperature is also high. The uneven heating of the bearing seat and side cover plate can cause deformation and cracking of the side cover plate in severe cases.

　　轴径磨损，使轴与轴承内圈间隙过大，轴承座磨损使轴承座与轴承外圈间隙过大，都会造成转子卡涩或摩擦。特别是皮带连接的风机，主动轴由于受皮带拉力的作用，致使轴承座单向受力较大，容易出现皮带侧主动轴的轴承座单边磨损。

　　Wear of the shaft diameter can cause excessive clearance between the shaft and the inner ring of the bearing, and wear of the bearing seat can cause excessive clearance between the bearing seat and the outer ring of the bearing, both of which can cause rotor jamming or friction. Especially for fans connected by belts, the active shaft is subjected to significant unidirectional force on the bearing seat due to the tension of the belt, which can lead to unilateral wear of the bearing seat on the belt side of the active shaft.

　　(3)齿轮磨损

　　(3) Gear wear

　　齿轮磨损，齿轮侧间隙增大，将造成两转子位置发生变化，使主动转子与从动转子之间合叶间隙变小、分叶间隙增大，引起两转子互相碰撞、摩擦。

　　Gear wear and increased clearance on the gear side will cause a change in the position of the two rotors, resulting in a decrease in the clearance between the active rotor and the driven rotor and an increase in the clearance between the blades, causing the two rotors to collide and rub against each other.

　　2、罗茨鼓风机故障处理方式

　　2. Troubleshooting methods for Roots blower

　　(1)调节分合叶间隙

　　(1) Adjust the gap between the splitting and folding blades

　　用塞尺检查转子分、合叶间隙值，使其在标准范围内。检查调节间隙的背帽与螺栓，保证其完好性。

　　Use a feeler gauge to check the clearance value between the rotor and the blade, ensuring it is within the standard range. Check the back cap and bolts that adjust the gap to ensure their integrity.

　　要求：分叶间隙占总间隙的1/3，但不小于0.15mm；合叶间隙占总间隙的2/3，且要大于齿轮侧隙1.5倍。

　　Requirement: The blade clearance accounts for one-third of the total clearance, but not less than 0.15mm; the blade clearance accounts for two-thirds of the total clearance, and must be greater than 1.5 times the gear side clearance.

　　合叶为主动转子的啮合面向被动转子有靠近的趋势；分叶为主动转子的啮合面向被动转子有远离的趋势。若转子分、合叶间隙不合适，可调整齿套与轮毂或齿轮与轴的周向相对角度。

　　The meshing surface of the active rotor tends to approach the passive rotor; The meshing surface of the active rotor tends to move away from the passive rotor. If the clearance between the rotor blades is not suitable, the circumferential relative angle between the gear sleeve and the hub or between the gear and the shaft can be adjusted.

　　转子分叶、合叶的调整是罗茨鼓风机检修的关键部分，直接决定着检修质量的好坏。不同类型的罗茨鼓风机，有不同的调节形式。轴与齿轮为锥型无键连接时，一般通过调节轴与齿轮周向相对位置；轴与齿轮为键连接时，一般通过调节从动齿轮与轮毂的相对位置。

　　The adjustment of rotor blade splitting and merging is a key part of the maintenance of Roots blower, which directly determines the quality of maintenance. Different types of Roots blowers have different adjustment forms. When the shaft and gear are connected in a tapered keyless manner, the relative position of the shaft and gear in the circumferential direction is generally adjusted; When the shaft is connected to the gear as a key, it is generally achieved by adjusting the relative position between the driven gear and the wheel hub.

　　风机正常运转过程中，随着齿轮磨损，间隙都会地发生变化，其中合叶间隙趋向减小，分叶间隙趋向增大。在调整两叶轮的工作间隙时，应预先将合叶间隙适当调大，一般合叶间隙是分叶间隙的2倍。

　　During the normal operation of the fan, as the gears wear, the clearance will change, with the closing clearance tending to decrease and the splitting clearance tending to increase. When adjusting the working clearance of the two impellers, the clearance between the blades should be appropriately increased in advance. Generally, the clearance between the blades is twice that of the clearance between the blades.

　　叶轮间隙调整时，首先将叶片转到与水平方向呈45°的位置，此时两叶轮的间隙即为分叶或合叶间隙。

　　When adjusting the clearance between the impellers, first rotate the blades to a position at a 45 ° angle to the horizontal direction. At this point, the clearance between the two impellers is the split or combined clearance.

　　现场调节时，一般用同样厚度的塞尺固定在两转子间，并将两转子固定，再装入主动齿轮，并将从动齿轮的标记对准主动齿的标记压入轴上，依次装上齿轮挡圈，止动垫圈和紧固螺帽。调整好后再用塞尺测量分叶间隙与合叶间隙的实际大小，如不合适重新调整，直到符合标准。

　　When adjusting on site, a feeler gauge of the same thickness is generally used to fix between the two rotors, and the two rotors are fixed. Then, the driving gear is installed, and the mark of the driven gear is aligned with the mark of the driving gear and pressed onto the shaft. The gear retaining ring, stop washer, and fastening nut are installed in sequence. After adjustment, use a feeler gauge to measure the actual size of the clearance between the dividing and closing blades. If it is not suitable, readjust it until it meets the standard.

　　(2)更换轴承

　　(2) Replace bearings

　　检查侧盖板是否变形有裂纹。变形不严重，可打磨高点；变形严重则更换侧盖板；如有裂纹，可进行补焊。

　　Check if the side cover plate is deformed or cracked. The deformation is not severe and can be polished to a higher point; If the deformation is severe, replace the side cover plate; If there are cracks, they can be repaired by welding.

　　检查轴承座与轴径是否磨损。如果轴磨损，一般进行补焊；如果轴承座磨损，单独的轴承座一般更换新件，不进行修理；轴承座与侧盖板为一体时，则补焊轴承座，使其配合间隙达到技术要求。

　　Check if the bearing seat and shaft diameter are worn. If the shaft is worn, it is generally repaired by welding; If the bearing seat is worn, the individual bearing seat is generally replaced with a new part without repair; When the bearing seat is integrated with the side cover plate, the bearing seat should be welded to meet the technical requirements for the fitting clearance.

　　(3)检查齿侧间隙，更换齿轮

　　(3) Check the tooth clearance and replace the gear

　　用红丹粉检查齿轮啮合部位的接触面积。检查齿侧间隙的方法有打表法、塞尺法、压铅丝法。

　　Check the contact area of the gear meshing part with red lead powder. The methods for checking the tooth flank clearance include marking method, feeler gauge method, and lead wire pressing method.

　　标准要求：侧隙0.10~0.18mm、啮合部位在齿面中部，齿表接触面积沿齿高方向不小于50%，沿齿宽方向不小于70%。若检测结果不符合要求，需更换齿轮。

　　Standard requirements: Side clearance of 0.10~0.18mm, meshing position in the middle of the tooth surface, tooth surface contact area not less than 50% along the tooth height direction, and not less than 70% along the tooth width direction. If the test results do not meet the requirements, the gear needs to be replaced.

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