旋片式真空泵（简称旋片泵）是一种油封式机械真空泵。其工作压强范围为101325~1.33×10-2（Pa）属于低真空泵。它可以单使用，也可以作为其它高真空泵或超高真空泵的前级泵。它已广泛地应用于冶金、机械、军工、电子、化工、轻工、石油及医药等生产和科研部门。
Rotary vane vacuum pump (referred to as rotary vane pump) is a kind of oil seal mechanical vacuum pump. Its working pressure range is 101325~1.33 x 10-2 (Pa), which belongs to low vacuum pump. It can be used alone or as a front pump for other high vacuum pumps or ultra high vacuum pumps. It has been widely used in metallurgical, mechanical, military, electronic, chemical, light industry, petroleum and pharmaceutical production and research departments.
旋片泵可以抽除密封容器中的干燥气体，若附有气镇装置，还可以抽除一定量的可凝性气体。但它不适于抽除含氧过高的，对金属有腐蚀性的、对泵油会起化学反应以及含有颗粒尘埃的气体。
Rotary vane pump can pump dry gas in a sealed container, with gas ballast if the device can also be pumped condensable gas in a certain amount. But it is not suitable for pumping oxygen containing high, corrosive to metal, chemical reaction to pump oil and gas containing particles of dust.
旋片泵是真空技术中比较基本的真空获得设备之一。旋片泵多为中小型泵。旋片泵有单级和双级两种。所谓双级，就是在结构上将两个单级泵串联起来。一般多做成双级的，以获得较高的真空度。 旋片泵的抽速与入口压强的关系规定如下：在入口压强为1333Pa、1.33Pa和1.33×10-1（Pa）下，其抽速值分别不得低于泵的名义抽速的95%、50%和20%。
Rotary vane pump is a basic vacuum to obtain equipment. Rotary vane pumps are mostly medium and small pumps. There are two types of rotary vane pumps: single stage and double stage. The so-called double stage, is in the structure of the two single-stage pumps connected in series. It is usually made of two stages to obtain higher vacuum. The relationship between the pumping speed and the inlet pressure of the rotary vane pump is as follows: at the inlet pressure of 1333Pa, 1.33Pa and 1.33 x 10-1 (Pa), the pumping speed shall not be less than 95%, 50% and 20% of the nominal pumping speed of the pump, respectively.
旋片泵主要由泵体、转子、旋片、端盖、弹簧等组成。在旋片泵的腔内偏心地安装一个转子，转子外圆与泵腔内表面相切（二者有很小的间隙），转子槽内装有带弹簧的二个旋片。旋转时，靠离心力和弹簧的张力使旋片顶端与泵腔的内壁保持接触，转子旋转带动旋片沿泵腔内壁滑动。
Rotary vane pump mainly by the pump, rotor, rotary vane, end cover, spring etc.. A rotor is installed eccentrically in the cavity of the rotary vane pump, the outer circle of the rotor is tangent to the surface of the pump cavity (two small gaps), and two rotors with a spring are installed in the rotor slot. During the rotation, the centrifugal force and the tension of the spring keep the contact between the top of the rotary blade and the inner wall of the pump cavity, and the rotor rotates to drive the vane to slide along the inner wall of the pump cavity.
两个旋片把转子、泵腔和两个端盖所围成的月牙形空间分隔成A、B、C三部分，如图所示。当转子按箭头方向旋转时，与吸气口相通的空间A 的容积是逐渐增大的，正处于吸气过程。而与排气口相通的空间C的容积是逐渐缩小的，正处于排气过程。居中的空间B的容积也是逐渐减小的，正处于压缩过程。由于空间A的容积是逐渐增大（即膨胀），气体压强降低，泵的入口处外部气体压强大于空间A内的压强，因此将气体吸入。当空间A与吸气口隔时，即转至空间B的位置，气体开始被压缩，容积逐渐缩小，比较后与排气口相通。当被压缩气体超过排气压强时，排气阀被压缩气体推开，气体穿过油箱内的油层排至大气中。由泵的连续运转，达到连续抽气的目的。如果排出的气体通过气道而转入另一级（低真空级），由低真空级抽走，再经低真空级压缩后排至大气中，即组成了双级泵。这时总的压缩比由两级来负担，因而提高了极限真空度。
Two rotary vane rotor, the pump chamber and two end caps surrounded by crescent shaped space is divided into A, B and C three parts, as shown in figure. When the rotor rotates in the direction of the arrow, the volume of the space A communicating with the suction port is gradually increasing, and it is in the process of suction. The volume of the space C, which is communicated with the exhaust port, is gradually shrinking and is in the exhaust process. The volume of B in the center space is also gradually decreasing, and it is in the compression process. Because the volume of the space A is gradually increasing (expansion), the gas pressure decreases, and the gas pressure at the entrance of the pump is greater than the pressure in the space A, so the gas is sucked into the air. When the space A is separated from the suction port, that is, to the position of the space B, the gas begins to be compressed, the volume gradually shrinks, and finally communicates with the exhaust port. When the compressed gas exceeds the exhaust pressure, the exhaust valve is pushed by the compressed gas, and the gas passes through the oil layer in the tank to the atmosphere. The continuous operation of the pump, to achieve the purpose of continuous pumping. If the exhaust gas passes through the airway to another level (low vacuum level), it is pulled out from the low vacuum stage, then compressed back to the atmosphere through the low vacuum stage, which forms a two-stage pump. At this point, the total compression ratio is supported by two levels, thereby increasing the limit vacuum.
