羅茨鼓風(fēng)機(jī)（Roots blower），又稱容積式鼓風(fēng)機(jī)，是一種通過(guò)兩個(gè)漸開(kāi)線葉形轉(zhuǎn)子在氣缸內(nèi)相對(duì)運(yùn)動(dòng)實(shí)現(xiàn)氣體壓縮與輸送的機(jī)械設(shè)備。其工作原理與齒輪泵相似——機(jī)殼內(nèi)有兩個(gè)特殊形狀的轉(zhuǎn)子（常為腰形或“8”字形），兩轉(zhuǎn)子與機(jī)殼之間的縫隙很小，使轉(zhuǎn)子能自由轉(zhuǎn)動(dòng)而泄漏出彩少。兩個(gè)轉(zhuǎn)子旋轉(zhuǎn)方向相反，依靠同步齒輪嚙合驅(qū)動(dòng)。當(dāng)轉(zhuǎn)子旋轉(zhuǎn)時(shí)，轉(zhuǎn)子與機(jī)殼之間形成的工作室容積發(fā)生周期性變化，從而實(shí)現(xiàn)氣體的吸入、壓縮和排出。羅茨鼓風(fēng)機(jī)屬容積回轉(zhuǎn)鼓風(fēng)機(jī)，每個(gè)轉(zhuǎn)子相當(dāng)于只有兩個(gè)齒的齒輪。

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.

羅茨鼓風(fēng)機(jī)的主要結(jié)構(gòu)包括電機(jī)、同步齒輪、兩個(gè)葉形轉(zhuǎn)子、機(jī)殼和軸承等。電機(jī)為風(fēng)機(jī)提供動(dòng)力，齒輪通過(guò)嚙合驅(qū)動(dòng)轉(zhuǎn)子旋轉(zhuǎn)。按轉(zhuǎn)子的形狀，羅茨鼓風(fēng)機(jī)分為兩葉型和三葉型。三葉型轉(zhuǎn)子每轉(zhuǎn)動(dòng)一次由兩個(gè)轉(zhuǎn)子進(jìn)行三次吸、排氣，與二葉型相比，氣體脈動(dòng)減少，負(fù)荷變化小，機(jī)械強(qiáng)度高，噪聲更低，振動(dòng)也更小。三葉型因吸排氣頻率高而具備更低的振動(dòng)噪聲。

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.

羅茨鼓風(fēng)機(jī)在非常高設(shè)計(jì)壓力范圍內(nèi)，管網(wǎng)阻力變化時(shí)流量變化很小。當(dāng)系統(tǒng)壓力變化時(shí)，鼓風(fēng)量基本不變，這一“強(qiáng)制輸氣”特性是其區(qū)別于離心風(fēng)機(jī)的重要特征。羅茨鼓風(fēng)機(jī)風(fēng)量受轉(zhuǎn)速控制，風(fēng)量調(diào)整可通過(guò)變頻調(diào)速進(jìn)行，變頻后風(fēng)壓可以維持。相比離心風(fēng)機(jī)，羅茨鼓風(fēng)機(jī)適用于高壓小流量場(chǎng)景。其設(shè)計(jì)遵循JB/T 8941.1標(biāo)準(zhǔn)，無(wú)故障運(yùn)行時(shí)間不低于6000小時(shí)。羅茨鼓風(fēng)機(jī)可輸送清潔空氣、煤氣及惰性氣體，壓比通常低于1.7，排氣量覆蓋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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