泵

Pump was a positive circular shell, inhalation mouth and pump outlet are at the top of the shell.

泵壳呈正圆形，吸入口和排出口均在泵壳的顶部。

At pump start before the shell and the water pump tube must be filled with water, the air This is because there is existence, the population vacuum pump can not create and maintain.

水泵在启动以前，泵壳和吸水管内必须先充满水，这是因为有空气存在的情况下，泵吸人口真空无法形成和保持。

Role is to prevent the pump shell along the axis of leakage of liquid or air leakage into the pump outside shell.

作用是防止泵壳内液体沿轴漏出或外界空气漏入泵壳内。

Pump casing lined with hardened steel, stainless steel, plastic or ceramic to protect the pump shell.

泵壳内衬硬化钢，不锈钢、塑料或者陶瓷以保护泵壳。

Role is to prevent the pump shell leakage of liquid along the axis or outside air leakage into the pump shell.

作用是防止泵壳内液体沿轴漏出或外界空气漏入泵壳内。

Centrifugal pump flow rate as a pressure change much, while the volume of pump flow rate as a pressure change was small, and the centrifugal pump shaft power decreases with the head of the law to improve the contrary, the volume of the pump shaft power with the pressure increase and increase.

离心泵流量随压力改变很大，而容积泵流量随压力改变却很小，与离心泵的轴功率随扬程提高而减小的规律相反，容积泵的轴功率随压力的提高而增大。

When proceeding pump testing, we collect a good many parameters, and figure out the pump gross head, pump shaft power, NPSH and other parameters. Different units of those parameters are used in different countries, and sometimes the customer asks for the test data of special media. Making a test of every medium of the same pump is not realistic, and the costs will be increase, so we convert the units of the data, and figure out the testing data according to different customer's special requirements. We reduced costs and got good remarks from the corporation through the application of unit conversion technology.

水泵试验时，要采集诸多参数，并且根据这些参数计算出扬程、轴功率、NPSH等数值，不同国家这些参数采用的单位不同，企业必须能够按照客户要求的单位提供试验数据；并且有时客户要求得到水泵在特殊介质下进行试验得出的试验数据，同一台泵在每种介质下都做一遍试验不太现实，而且会提高企业的生产成本，提出将采集的数据进行单位换算，根据不同国家或者客户的特殊要求求出泵的试验数据，在实际应用中节省了试验成本，得到了企业的好评。

Because the traditional design of the pump shaft and its strength calibration are quite tedious, it is extremely necessary and imminent to develop a set of convenience and dependable CAD software to improve the quality and efficiency of shaft part in the pump and to achieve the combination of the pump shaft intensity calibration and AutoCAD.

鉴于泵轴传统手工设计和强度校核的繁琐，开发一套方便、可靠的适用于水泵轴类零件强度校核的CAD系统以提高泵轴类零件设计的质量与效率，实现轴的强度校核计算与AutoCAD技术的结合就显得非常迫切和必要。

In pumping high-viscosity oil, with the increase of the shaft speed, the efficiency of the pump at the optimum operating point is improved, and the flow rate and hoisting height at the optimum efficiency point rises, therefore the rated speed of the viscous oil pump should be remarkably higher than that of the water pump.

输送高粘油时，随着泵轴转速的提高，离心泵最优工况点的效率提高，最佳效率点的流量和扬程也相应提高，因此，输送粘油用的泵的设计转速必须比水泵有较大幅度的提高。

The twin vortex at the tip clearance of hub side and the asymmetric recirculation at wall of inlet duct are also observed. 4 The mass-weighted average of flow parameter at inlet and outlet of every passage of impeller changes with different positions. In addition to the above, with the unsteady method, the head rise, shaft power and efficiency have been predicted well.

再次，采用整机非定常计算准确预测了三种工况下部分流泵的扬程、轴功率和效率；发现了叶轮进出口质量加权平均的速度、压力、动量矩的宏观不变特性；蜗壳内流动的非定常性对部分流泵的外特性有重要的影响。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。