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旋片式真空泵（簡稱旋片泵）是一種油封式機(jī)械真空泵。其工作壓強(qiáng)范圍為101325~1.33×10-2（Pa）屬于低真空泵。它可以單使用，也可以作為其它高真空泵或超高真空泵的前級泵。它已廣泛地應(yīng)用于冶金、機(jī)械、軍工、電子、化工、輕工、石油及醫(yī)藥等生產(chǎn)和科研部門。

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氣體，若附有氣鎮(zhèn)裝置，還可以抽除一定量的可凝性氣體。但它不適于抽除含氧過高的，對金屬有腐蝕性的、對泵油會起化學(xué)反應(yīng)以及含有顆粒塵埃的氣體。

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.

??旋片泵是真空技術(shù)中比較基本的真空獲得設(shè)備之一。旋片泵多為中小型泵。旋片泵有單級和雙級兩種。所謂雙級，就是在結(jié)構(gòu)上將兩個單級泵串聯(lián)起來。一般多做成雙級的，以獲得較高的真空度。 旋片泵的抽速與入口壓強(qiáng)的關(guān)系規(guī)定如下：在入口壓強(qiáng)為1333Pa、1.33Pa和1.33×10-1（Pa）下，其抽速值分別不得低于泵的名義抽速的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.

??旋片泵主要由泵體、轉(zhuǎn)子、旋片、端蓋、彈簧等組成。在旋片泵的腔內(nèi)偏心地安裝一個轉(zhuǎn)子，轉(zhuǎn)子外圓與泵腔內(nèi)表面相切（二者有很小的間隙），轉(zhuǎn)子槽內(nèi)裝有帶彈簧的二個旋片。旋轉(zhuǎn)時，靠離心力和彈簧的張力使旋片頂端與泵腔的內(nèi)壁保持接觸，轉(zhuǎn)子旋轉(zhuǎn)帶動旋片沿泵腔內(nèi)壁滑動。

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.

??兩個旋片把轉(zhuǎn)子、泵腔和兩個端蓋所圍成的月牙形空間分隔成A、B、C三部分，如圖所示。當(dāng)轉(zhuǎn)子按箭頭方向旋轉(zhuǎn)時，與吸氣口相通的空間A 的容積是逐漸增大的，正處于吸氣過程。而與排氣口相通的空間C的容積是逐漸縮小的，正處于排氣過程。居中的空間B的容積也是逐漸減小的，正處于壓縮過程。由于空間A的容積是逐漸增大（即膨脹），氣體壓強(qiáng)降低，泵的入口處外部氣體壓強(qiáng)大于空間A內(nèi)的壓強(qiáng)，因此將氣體吸入。當(dāng)空間A與吸氣口隔時，即轉(zhuǎn)至空間B的位置，氣體開始被壓縮，容積逐漸縮小，比較后與排氣口相通。當(dāng)被壓縮氣體超過排氣壓強(qiáng)時，排氣閥被壓縮氣體推開，氣體穿過油箱內(nèi)的油層排至大氣中。由泵的連續(xù)運轉(zhuǎn)，達(dá)到連續(xù)抽氣的目的。如果排出的氣體通過氣道而轉(zhuǎn)入另一級（低真空級），由低真空級抽走，再經(jīng)低真空級壓縮后排至大氣中，即組成了雙級泵。這時總的壓縮比由兩級來負(fù)擔(dān)，因而提高了極限真空度。

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.