1、羅茨風機是一種容積式鼓風機。羅茨風機通過一對轉子的“嚙合”將進氣口隔開，轉子由一對同步齒輪傳動，做反方向運動，將吸入的氣體壓縮并從吸氣口推至排氣口。氣體到達排氣口的瞬間，因排氣側高壓氣體的回流而被加壓提升壓力，從而完成氣體輸送。

2、離心風機是利用高速旋轉的葉輪將氣體加速，使動能轉換成勢能（壓力），從而完成氣體輸送的。

3、羅茨風機與離心風機的工作原理不同，風機的基本結構也不相同。

4、離心風機是根據動能轉換為勢能的原理，利用高速旋轉的葉輪將氣體加速，然后減速、改變流向，使動能轉換成勢能（壓力）。在單級離心風機中，氣體從軸向進入葉輪，氣體流經葉輪時改變成徑向，然后進入擴壓器。在擴壓器中，氣體改變了流動方向造成減速，這種減速作用將動能轉換成壓力能。壓力增高主要發生在葉輪中，其次發生在擴壓過程。在多級離心風機中，用回流器使氣流進入下一葉輪，產生更高壓力。

1. Roots blower is a positive displacement blower. Roots blower separates the air inlet through the "engagement" of a pair of rotors. The rotor is driven by a pair of synchronous gears and moves in the opposite direction to compress the inhaled gas and push it from the suction inlet to the exhaust outlet. At the moment when the gas reaches the exhaust port, it will be pressurized to increase the pressure due to the backflow of high-pressure gas at the exhaust side, thus completing the gas transmission.

2. The centrifugal fan uses high-speed rotating impeller to accelerate the gas and convert kinetic energy into potential energy (pressure), thus completing the gas transmission.

3. The working principle of Roots blower is different from that of centrifugal blower, and the basic structure of blower is also different.

4. According to the principle of converting kinetic energy into potential energy, the centrifugal fan uses high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction, so that kinetic energy can be converted into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to the radial direction when it flows through the impeller, and then enters the diffuser. In the diffuser, the gas changes the flow direction and causes deceleration, which converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller, and secondly in the diffusion process. In a multistage centrifugal fan, a reflux device is used to make the air flow enter the next impeller to generate higher pressure.