罗茨鼓风机，也称作罗茨风机，英文名Roots blower，系属容积回转鼓风机，利用两个或者三个叶形转子在气缸内作相对运动来压缩和输送气体的回转压缩机。这种鼓风机结构简单，制造方便，适用于低压力场合的气体输送和加压，也可用作真空泵。

Roots blower, also known as roots blower, is a volume rotary blower, which uses two or three blade rotors to make relative movement in the cylinder to compress and deliver gas. The blower has the advantages of simple structure and convenient manufacture. It is suitable for gas transmission and pressurization in low pressure occasions. It can also be used as a vacuum pump.

罗茨鼓风机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。

Roots blower is a volume rotary blower. The compressor keeps the two rotors engaged by the synchronous gear at the shaft end of the rotor. Each concave curved part on the rotor forms a working volume with the inner wall of the cylinder. During the rotation of the rotor, the gas is taken away from the suction port. When it is moved near the exhaust port and connected with the exhaust port, the pressure in the working volume suddenly rises due to the backflow of gas with higher pressure, and then the gas is transmitted to the exhaust channel. The two rotors are not in contact with each other, and they are sealed by tightly controlled gap, so the discharged gas is not polluted by lubricating oil.

其更大 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。

Its biggest feature is that when the pressure is adjusted within the allowable range, the flow has little change, the pressure selection range is very wide, and it has the characteristics of forced gas transmission. The medium does not contain oil during transportation. The utility model has the advantages of simple structure, convenient maintenance, long service life and small vibration of the whole machine.

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，更高 可达2.1，可以多级串联使用。

Vacuum pump. The pulsation of air velocity and pressure caused by periodic suction, exhaust and instantaneous constant volume compression will produce large aerodynamic noise. In addition, the clearance between rotors and between rotor and cylinder will cause gas leakage, resulting in reduced efficiency. The exhaust volume of Roots blower is 0.15 ~ 150 m3 / min and the speed is 150 ~ 3000 rpm. The single-stage pressure ratio is usually less than 1.7, up to 2.1, and can be used in series.

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