罗茨鼓风机（Roots blower），又称容积式鼓风机，是一种通过两个渐开线叶形转子在气缸内相对运动实现气体压缩与输送的机械设备。其工作原理与齿轮泵相似——机壳内有两个特殊形状的转子（常为腰形或“8”字形），两转子与机壳之间的缝隙很小，使转子能自由转动而泄漏出彩少。两个转子旋转方向相反，依靠同步齿轮啮合驱动。当转子旋转时，转子与机壳之间形成的工作室容积发生周期性变化，从而实现气体的吸入、压缩和排出。罗茨鼓风机属容积回转鼓风机，每个转子相当于只有两个齿的齿轮。

Roots blower, also known as positive displacement blower, is a mechanical device that compresses and transports gas through the relative motion of two involute blade rotors in a cylinder. Its working principle is similar to that of a gear pump - there are two specially shaped rotors (often waist shaped or "8" - shaped) inside the casing, and the gap between the two rotors and the casing is very small, allowing the rotors to rotate freely with minimal leakage. The two rotors rotate in opposite directions and are driven by synchronous gear meshing. When the rotor rotates, the working chamber volume formed between the rotor and the casing undergoes periodic changes, thereby achieving gas suction, compression, and discharge. Roots blower is a volumetric rotary blower, where each rotor is equivalent to a gear with only two teeth.

罗茨鼓风机的主要结构包括电机、同步齿轮、两个叶形转子、机壳和轴承等。电机为风机提供动力，齿轮通过啮合驱动转子旋转。按转子的形状，罗茨鼓风机分为两叶型和三叶型。三叶型转子每转动一次由两个转子进行三次吸、排气，与二叶型相比，气体脉动减少，负荷变化小，机械强度高，噪声更低，振动也更小。三叶型因吸排气频率高而具备更低的振动噪声。

The main structure of a Roots blower includes a motor, synchronous gears, two blade rotors, a casing, and bearings. The motor provides power to the fan, and gears drive the rotor to rotate through meshing. According to the shape of the rotor, Roots blowers are divided into two blade and three blade types. The three bladed rotor undergoes three suction and exhaust cycles with two rotors per rotation. Compared to the two bladed rotor, the three bladed rotor has reduced gas pulsation, smaller load changes, higher mechanical strength, lower noise, and smaller vibration. The three leaf type has lower vibration noise due to its high suction and exhaust frequency.

罗茨鼓风机在非常高设计压力范围内，管网阻力变化时流量变化很小。当系统压力变化时，鼓风量基本不变，这一“强制输气”特性是其区别于离心风机的重要特征。罗茨鼓风机风量受转速控制，风量调整可通过变频调速进行，变频后风压可以维持。相比离心风机，罗茨鼓风机适用于高压小流量场景。其设计遵循JB/T 8941.1标准，无故障运行时间不低于6000小时。罗茨鼓风机可输送清洁空气、煤气及惰性气体，压比通常低于1.7，排气量覆盖0.15-150立方米/分。

The flow rate of Roots blower changes very little when the pipe network resistance changes within the maximum design pressure range. When the system pressure changes, the blowing volume remains basically unchanged, and this "forced gas transmission" characteristic is an important feature that distinguishes it from centrifugal fans. The air volume of Roots blower is controlled by the speed, and the air volume can be adjusted through frequency conversion speed regulation. After frequency conversion, the air pressure can be maintained. Compared to centrifugal fans, Roots blowers are suitable for high-pressure low flow scenarios. Its design follows the JB/T 8941.1 standard, and the fault free operation time is not less than 6000 hours. Roots blower can deliver clean air, coal gas, and inert gases, with a pressure ratio typically below 1.7 and an exhaust volume ranging from 0.15 to 150 cubic meters per minute.

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