罗茨鼓风机原理系属容积回转鼓风机。这种压缩机靠转子轴端的同步齿轮使两转子保持啮合。转子上每一凹入的曲面部分与气缸内壁组成工作容积，在转子回转过程中从吸气口带走气体，当移到排气口附近与排气口相连通的瞬时，因有较高压力的气体回流，这时工作容积中的压力突然升高，然后将气体输送到排气通道。两转子互不接触，它们之间靠严密控制的间隙实现密封，故排出的气体不受润滑油污染。

The principle of Roots blower belongs to the category of volumetric rotary blower. This type of compressor relies on synchronous gears at the rotor shaft end to keep the two rotors in mesh. Each concave curved surface on the rotor forms a working volume with the inner wall of the cylinder. During the rotation of the rotor, gas is taken away from the intake port. When it is moved to the vicinity of the exhaust port and connected to the exhaust port, there is a sudden increase in pressure in the working volume due to the reflux of high-pressure gas. Then, the gas is transported to the exhaust channel. The two rotors are not in contact with each other and are sealed by a tightly controlled gap, so the discharged gas is not contaminated by lubricating oil.

罗茨鼓风机的特点其最大的特点是使用时当压力在允许范围内加以调节时流量之变动甚微，压力选择范围很宽，具有强制输气的特点。输送时介质不含油。结构简单、维修方便、使用寿命长、整机振动小。

The biggest feature of Roots blower is that when the pressure is adjusted within the allowable range during use, the flow rate changes very little, the pressure selection range is wide, and it has the characteristic of forced gas transmission. The medium does not contain oil during transportation. Simple structure, easy maintenance, long service life, and low overall vibration.

真空泵。由于周期性的吸、排气和瞬时等容压缩造成气流速度和压力的脉动，因而会产生较大的气体动力噪声。此外，转子之间和转子与气缸之间的间隙会造成气体泄漏，从而使效率降低。罗茨鼓风机的排气量为0.15~150立方米/分，转速为 150~3000转/分。单级压比通常小于1.7，最高可达2.1，可以多级串联使用。

Vacuum pump. Due to periodic suction, exhaust, and instantaneous isochoric compression, there are fluctuations in airflow velocity and pressure, resulting in significant aerodynamic noise. In addition, the gaps between rotors and between rotors and cylinders can cause gas leakage, thereby reducing efficiency. The exhaust volume of Roots blower is 0.15~150 cubic meters per minute, and the speed is 150~3000 revolutions per minute. The single-stage pressure ratio is usually less than 1.7 and can reach up to 2.1, and can be used in series in multiple stages.

罗茨鼓风机主要输送介质为清洁空气，清洁煤气，二氧化硫及其他惰性气体，特殊气体行业(煤气、天然气、沼气、二氧化碳、二氧化硫等)及高压工况的首选产品。鉴于具有上述特点，因而能广泛适应冶金、化工、化肥、石化、仪器、建材行业。

Roots blower is mainly used to transport clean air, clean coal gas, sulfur dioxide and other inert gases. It is the preferred product for special gas industries (coal gas, natural gas, biogas, carbon dioxide, sulfur dioxide, etc.) and high-pressure working conditions. Given the above characteristics, it can be widely adapted to the metallurgical, chemical, fertilizer, petrochemical, instrument, and building materials industries.

罗茨鼓风机按转子的形状，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，气体脉动性小，振动也小，噪声低.

Roots blowers are divided into two blade and three blade types according to the shape of the rotor. The three bladed rotor undergoes three suction and exhaust cycles with two rotors per rotation. Compared with the two blade type, the gas pulsation is smaller, the vibration is also smaller, and the noise is lower

罗茨鼓风机与离心风机的区别比较大:

The difference between Roots blower and centrifugal fan is quite significant:

⒈工作原理不同，离心风机用的是曲线风叶，靠离心力将气体甩到机壳处，而罗茨风机用的是两个8字形的风叶，它们间的间隙很小，靠两个叶片的挤压，将气体挤至出气口。

1. The working principle is different. Centrifugal fans use curved blades to throw gas to the casing by centrifugal force, while Roots fans use two 8-shaped blades with a small gap between them. The gas is squeezed to the outlet by the compression of the two blades.

⒉由于工作原理不同，一般它们的工作压力不同，罗茨风机的出气压力比较高，而离心风机比较小。

2. Due to different working principles, their working pressures are generally different. Roots blowers have a higher outlet pressure, while centrifugal blowers have a smaller pressure.

⒊风量不同，一般罗茨风机用在风量要求不大但压力要求较高的地方，而离心风机用在压力要求低，风量要求大的地方。

3. Different air volumes. Generally, Roots blowers are used in places where air volume requirements are not high but pressure requirements are high, while centrifugal blowers are used in places where pressure requirements are low and air volume requirements are high.

⒋制造精度不一样，罗茨风机要求的精度很高，对装配要求也很严，而离心风机比较松。

4. The manufacturing accuracy is different. Roots blowers require high precision and strict assembly requirements, while centrifugal blowers are relatively loose.

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