一般来说三叶罗茨鼓风机，各部位间隙在20℃时的静态理论值为：

　　1、叶轮与叶轮之间的间隙0.4-~0.5mm;

　　2、叶轮与叶壳之间的径向间隙0.2~0.3mm;

　　3、叶轮与左、右墙板之间的轴向间隙0.3~0.4mm(左墙板间隙必须大于右墙板间隙0.05mm以上)，同步齿轮的啮合间隙0.08~0.16mm。

　　Generally speaking, for a three-blade Roots blower, the static theoretical values of the clearances between various parts at 20℃ are as follows: 1. The clearance between impellers is 0.4-~0.5mm; 2. The radial clearance between the impeller and the casing is 0.2~0.3mm; 3. The axial clearance between the impeller and the left and right wallboards is 0.3~0.4mm (the clearance with the left wallboard must be at least 0.05mm greater than that with the right wallboard), and the meshing clearance of the synchronous gears is 0.08~0.16mm.

　　三叶罗茨风机的检修：

　　我们认为三叶罗茨鼓风机工作间隙的调整是罗茨风机整个检修过程中非常重要，掌握起来难度也比较大，通过分析罗茨风机的结构原理，叶轮在旋转一周的过程中，在士45°的位置上(指叶轮压力角与水平线成士45°角度时，两叶轮之间的间隙是两叶轮之间最关键的间隙，

　　且有两个+45°和两个-45°位置，在这些位置上，两叶轮最大轴向剖面刚好处于相对平行状态，因此这个角度就是调整三叶罗茨鼓风机工作间隙的最佳位置。

　　Maintenance of three-blade Roots blower: We believe that adjusting the working clearance of a three-blade Roots blower is crucial in the entire maintenance process of Roots blowers, and it is also relatively difficult to master. By analyzing the structural principle of the Roots blower, we find that during one rotation of the impeller, at the ±45° position (referring to when the pressure angle of the impeller forms an angle of ±45° with the horizontal line), the clearance between the two impellers is the most critical one. There are two +45° and two -45° positions, at which the maximum axial cross-section of the two impellers is just in a relatively parallel state. Therefore, this angle is the optimal position for adjusting the working clearance of a three-blade Roots blower.

　　罗茨风机有下面三个方面的间隙需要在安装时进行调整：

　　1. 主动转子与从动转子之间的间隙；

　　2. 主动转子和从动转子与机壳内表面的径向间隙；

　　3. 主动转子和从动转子两端平面与墙板轴向平面的间隙。这些间隙，一般在风机说明书中均有规定。间隙过小时，则容易发热，而使两转子发生摩擦，反之，间隙过大时，则使风机的性能降低。

　　The Roots blower requires adjustments to the clearances in the following three aspects during installation: 1. The clearance between the driving rotor and the driven rotor; 2. The radial clearance between the driving rotor and the driven rotor, as well as the inner surface of the casing; 3. The clearance between the flat surfaces at both ends of the driving rotor and the driven rotor, and the axial flat surface of the wallboard. These clearances are generally specified in the blower's instruction manual. If the clearance is too small, it is prone to generate heat, causing friction between the two rotors. Conversely, if the clearance is too large, it will degrade the performance of the blower.

　　因此，风机机体内转子与机壳部分的间隙调整，是整个安装中的关键。三叶罗茨鼓风机各部分间隙调整的如何，将会直接影响机器的性能，若调整的偏差较大时，甚至会产生机械事故。

　　Therefore, the adjustment of the clearance between the rotor and the casing within the fan body is crucial in the entire installation process. The adjustment of clearances in various parts of the three-blade Roots blower will directly affect the performance of the machine. If the adjustment deviation is significant, it may even lead to mechanical accidents.

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