双螺杆泵的用途和优点
The purpose and advantages of twin-screw pump
由双螺杆泵的原理知道，对于外置轴承的双螺杆泵，通过轴承定位，两根螺杆在衬套中互不接触，齿侧之间保持恒定的间隙（其间隙值由工况及泵本身规格决定），螺杆外圆与衬套内圆面也保持恒定的间隙不变。两根螺杆的传动由同步齿轮完成。齿轮箱中有独立的润滑，与泵工作腔隔开。这种结构的优点大大拓宽了双螺杆泵的使用范围，即：除了输送润滑性良好的介质外，还可输送大量的非润滑性介质，各种粘度（高粘度可达3*106mm/s）的介质以及具有腐蚀性（酸、碱等性质），磨蚀性的液体。
The principle known by the twin-screw pump for the external bearing twin-screw pump, through the bearing positioning, two screws in the bush is not in contact with each other, the tooth side of the gap between the constant (the gap value from working conditions and pump their own specification decisions), screw cylindrical with a round face, bush also maintained constant within the gap unchanged. 2 screw transmission gears from the synchronization to complete. Gear box has a separate lubrication, with the pump working chamber separated. The advantages of this structure greatly broadened the use of twin-screw pump, that is: In addition to conveying a good lubricating medium, it can also transport a large number of non-lubricating medium, various viscosity (peak viscosity of up to 3 * 106mm / s), as well as corrosive media (acids, alkalis and other properties), abrasive liquids.
双螺杆泵由于其恒定间隙的存在以及型线上的特点，其属于非密封型容积泵，因此除了输送纯液体外，还可输送气体和液体的混合物，即汽液混输，这也是双螺杆泵非常独特的优点之一。
Twin-screw clearance because of its constant presence, as well as in-line characteristics, it belongs to the non-vented type displacement pump, so apart from conveying a pure liquid, it can also transport a mixture of gases and liquids, namely, vapor-liquid mixed transportation, which is double - screw very unique strengths.
双螺杆泵由于结构的独特设计，可以自吸而无须专门的自吸装置，而且由于轴向输送轴流速度较小而具备很强的吸上能力即很小的NPSHr值。
Twin-screw pump due to the unique design of the structure can be self-priming without specific self-priming device, and because the axial axial transmission speed of smaller and has strong suction capacity, or the small NPSHr value.
双螺杆泵还可干转。由于运动部件在工作时互不接触，因此短时的干转不会破坏泵元件，这种特点给自动控制的流程提供了极大的方便，但干运转时间受多种因素限制，一般很短。
Twin-screw pump can also be dry transfer. As the moving parts do not touch each other at work, so would not undermine short-term dry transfer pump components, such characteristics to the automation of the process provides a great convenience, but the dry running time limited by many factors, generally a very short .
另外双螺杆泵在输送过程中无剪切，无乳化作用，因此不会破坏分子链结构和工况流程中所形成的特定的流体性质，并且由于传动依靠同步齿轮，泵运转噪音低，振动小，工作平稳。
Another twin-screw pump in the course of transmission without shear, non-emulsifying effect, it will not destroy the structure and working conditions of molecular chains formed by processes specific fluid properties, and because relying on synchronous transmission gear, pump operation, low noise, vibration a small, smooth. |
