单螺杆泵的选型要点
Selection of points of single-screw pump
1.单螺杆泵的压力确定：
1. Single-screw pump pressure to determine:
单螺杆泵大输出压力是根据衬套级数即衬套的导程数来确定：
Single-screw pump maximum output pressure is under the bush bush the lead of the series that the numbers to determine:
1级：高工作压力为0.6 MPa；
Level 1: maximum working pressure of 0.6 MPa;
2级：高工作压力为1.2 MPa；
2: maximum working pressure of 1.2 MPa;
4级：高工作压力为2.4 MPa；
Level 4: maximum working pressure of 2.4 MPa;
由于输送介质情况不同，对于含有严重磨损性的介质，请参照表一选择衬套级数。
As the transmission medium is different, for containing severe wear resistance of the medium, please refer to Table 1 Selected bush series.
2.单螺杆泵转速的选择：
2. Single-screw pump speed options:
单螺杆泵由于其结构特点，大部分使用在输送较高粘度的液体及含有颗粒的液体，因此其转数的选择非常关键，根据经验，列出表二、表三，您可根据具体情况综合考虑。
Single-screw pump because of its structural features, mostly used in the transportation of liquids and higher viscosity of the liquid containing the particles, so the choice of rotation is critical, according to experience, listed in Table 2, Table 3, you can depending on of comprehensive consideration.
3.单螺杆泵衬套橡胶材料的选择：
3. Single-screw bush rubber material selection:
单螺杆泵衬套为橡胶制品，也是单螺杆泵的一个易损件，它的选择好坏，直接影响衬套的寿命，一般正常情况下衬套的寿命为3-6个月，如果选用不当，衬套可能从钢管中脱落或橡胶掉块。所以要求我们对橡胶的基本特性及橡胶对各种不同介质的适应性有所了解，根据我们的经验列出表四、表五。
Rubber bushing for single-screw pump is a single-screw pump wearing parts, it is the choice of good or bad directly affects the lining of the life, under normal conditions of life bush 3-6 months, if the chosen properly, the lining may be detached from the steel or rubber blocks away. So, asked us to the basic characteristics of rubber and rubber on the adaptability of a variety of different media have to understand, according to our experience are listed in Table 4, Table 5.
4.材料组合选择：
4. Materials Portfolio Selection:
输送不同性质的介质，需不同材料组合。
Transport different types of media, be combinations of different materials.
5.性能表：
5. Performance Table:
一般单螺杆泵的性能表或特性曲线都是以20C清水为介质（粘度为1cst）时的数据，对于输送不同粘度下的流量与轴功率不同。
General single-screw pump performance curves are based on tables or 20C of water as a medium (viscosity 1cst) when the data for the transmission of different viscosities of different flow and shaft power.
6.轴封：
6. Seal:
根据需要和输送介质，可采用机械密封和填料密封两种，且这两种结构具有互换性。
According to needs and delivery medium, can be used two kinds of mechanical seals and packing seal, and the structure of these two kinds of interchangeability.
7.泵的驱动方式：
7. Pump driven by:
由于单螺杆泵为低速泵，泵的驱动方式较多，一般有低速电机直联（6级、8级）、齿轮减速电机驱动、无级变速电机驱动等方式。
As the single-screw pump for the low-speed pump, pump-driven approach more, generally have low-speed motor Direct (6, 8 grade), Gear motor drive, variable speed motor drive, etc..
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