羅茨鼓風機原理系屬容積回轉鼓風機。這種壓縮機靠轉子軸端的同步齒輪使兩轉子保持嚙合。轉子上每一凹入的曲面部分與氣缸內壁組成工作容積，在轉子回轉過程中從吸氣口帶走氣體，當移到排氣口附近與排氣口相連通的瞬時，因有較高壓力的氣體回流，這時工作容積中的壓力突然升高，然后將氣體輸送到排氣通道。兩轉子互不接觸，它們之間靠嚴密控制的間隙實現密封，故排出的氣體不受潤滑油污染。

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.

羅茨鼓風機的特點其最大的特點是使用時當壓力在允許范圍內加以調節時流量之變動甚微，壓力選擇范圍很寬，具有強制輸氣的特點。輸送時介質不含油。結構簡單、維修方便、使用壽命長、整機振動小。

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、排氣和瞬時等容壓縮造成氣流速度和壓力的脈動，因而會產生較大的氣體動力噪聲。此外，轉子之間和轉子與氣缸之間的間隙會造成氣體泄漏，從而使效率降低。羅茨鼓風機的排氣量為0.15~150立方米/分，轉速為 150~3000轉/分。單級壓比通常小于1.7，最高可達2.1，可以多級串聯使用。

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.

羅茨鼓風機主要輸送介質為清潔空氣，清潔煤氣，二氧化硫及其他惰性氣體，特殊氣體行業(煤氣、天然氣、沼氣、二氧化碳、二氧化硫等)及高壓工況的首選產品。鑒于具有上述特點，因而能廣泛適應冶金、化工、化肥、石化、儀器、建材行業。

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.

羅茨鼓風機按轉子的形狀，羅茨鼓風機分為兩葉型和三葉型。三葉型轉子每轉動一次由 兩 個轉子進行三 次吸、排氣。與二葉型相比，氣體脈動性小，振動也小，噪聲低.

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

羅茨鼓風機與離心風機的區別比較大:

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

⒈工作原理不同，離心風機用的是曲線風葉，靠離心力將氣體甩到機殼處，而羅茨風機用的是兩個8字形的風葉，它們間的間隙很小，靠兩個葉片的擠壓，將氣體擠至出氣口。

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，一般它們的工作壓力不同，羅茨風機的出氣壓力比較高，而離心風機比較小。

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風量不同，一般羅茨風機用在風量要求不大但壓力要求較高的地方，而離心風機用在壓力要求低，風量要求大的地方。

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制造精度不一樣，羅茨風機要求的精度很高，對裝配要求也很嚴，而離心風機比較松。

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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