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Reciprocating pump is a positive displacement pump is dependent on the piston pump cylinder for reciprocating motion to change the volume of work, so as to achieve the purpose of transmission fluid.

往复泵是容积式泵的一种，是依靠泵缸内的活塞作往复运动来改变工作容积，从而达到输送液体的目的。

Sales of the main varieties have INVIKTA, TEKNA, Series electromagnetic diaphragm metering pump; SPRING Series-PS1, PS2-type motor-driven plunger metering pump, MS1, MS0-type motor-driven mechanical diaphragm metering pump; PH / ORP-line control apparatus, Dosing device integration, fluid Dosing systems, and other related accessories.

销售的主要品种有INVIKTA、TEKNA、系列电磁隔膜式计量泵；SPRING系列-PS1、PS2型马达驱动柱塞式计量泵，MS1、MS0型马达驱动机械隔膜式计量泵；PH/ORP在线控制仪器、一体化加药装置、流体投药系统、相关配件等。

Vacuum pump used in the Stainless steel chemical centrifugal pump winter season, parking, the need to turn on the water pump drain plug screw to open the lower part of the media put the net.

真空泵在寒冬季节使用时，停车后，需将泵体下部放水螺塞拧开将介质放净。

The result shows that pump efficiency is increased to above 70% and pump inspection period is above 4 months, obviously higher than that of conventional gas drainage recovery by pump, which meets the demand of gas drainage recovery.

结果表明，应用新的配套技术后泵效在70%以上、检泵周期超过4个月，明显高于常规机抽排水采气技术水平，较好地满足了机抽排水采气的需要。

Based on the theory on the design of the solid liquid two-phase flow centrifugal pumps and considering the characteristics of the soil under water and the operation characteristics of the dredge pump, the design method of the dredge pump impeller is presented, the corresponding Visual Basic program is developed and the solid model of impeller is also created by using Pro/E. The parameterized design of the slurry pump is realized.

本文在现有的固液两相流泵设计理论的基础上，针对疏浚工程土质特性和疏浚泥泵工作特点，提出了疏浚泥泵叶轮的设计方法，开发了相应的Visual Basic程序，并应用Pro/E进行了叶轮实体造型，实现了疏浚泥泵叶轮的参数化设计。

The influence of the eccentricity mass moment, position of mass center and the bearing stiffness to the vibration characteristics of the rotor system is discussed in detail; 3. To verify the exactness of FEM and learn the principle of vibration of dredge pump further, The orbit of the rotor shaft of the pump in the dredger is measured, the measurement results show: the repeat of the orbit of the rotor shaft is very bad when dredge pump is in the dredging mud condition.

模态分析确定了泥泵的振动特性；谐响应分析确定了泥泵转子轴在偏心力的作用下轴截面处的最大响应位移；研究了转子轴的质心位置、轴承刚度和质量偏心矩对转子轴振动特性的影响； 3、采用轴心轨迹法，实船测量了泥泵轴工作时振动响应值。

An ejector or jet pump motor may be a separate unit mounted on the pump or the end bell of the motor may be part of the pump.

引射泵或射流泵的发动机可能是在泵上悬挂的一个独立单元，或者发动机的端盖是泵的一部分。

In case that vacuum pump stops working or power supply is suddenly broken off, valve will be cosed automatically to keep the vacuum system vacuum and the air charged into the cavity of vacuum pump, thus to prevent pump oil from reverse flow that can pollute the vacuum system.

使真空系统保持真空并将大气充入泵腔内，从而避免泵油逆向流动而污染真空系统。

With the technology, improve manufacturing processes and quality materials to choose from, small-scale rotor vane vacuum pump can be directly linked with the motor shaft, speed can be as high as 1450 r / min, significantly increased the pump rate and reduced exhaust pump.

随着技术的发展、制造工艺的完善和优质材料的选用，小型滑片真空泵的转轴可与电动机轴直联，转速可高达1450转／分，大大提高了泵的抽气速率和减轻了泵的重量。

As the molecular pump pumping speed for water vapor is only with the diameter cryopump pumping speed of the quarter, so molecular pump exhaust pump longer time than low temperature.

由于分子泵对水蒸气的抽速仅为同口径低温泵抽速的四分之一，所以分子泵的排气时间比低温泵长。

According to our present broadcasting situation,the thesis proposes using new technology to update and reform the present HFC. It also suggests broadcasting using self-advantage and arranging EPON in order to win the supermarket.

论文从我国广电的现状出发，结合实际，积极倡导采用新技术更新、改造我国现有的HFC网络；倡导广电现阶段利用自身优势，部署EPON网络来赢取市场。

A new general kinetic equation was derived in which the effect of the removal of condensation water was taken into account completely, and was applied to the polyesterification kinetic study of AA/HPHP and AA/NPG. It was found that the reaction order of self-catalyzed polyesterification was not constant. For these polyesterifications, the reaction order was 2.5 at a low temperature, while 3.0 at a high temperature.

考虑缩合水的排除对反应体系的影响，用体积浓度单位推导出一个新的聚酯反应总包动力学方程，并应用到AA/HPHP和AA/NPG两个聚酯化反应的动力学研究中，研究发现，自催化聚酯反应的反应级数并不是固定值，对于AA/HPHP和AA/NPG两个聚酯化反应而言，低温时反应级数为2.5，高温时反应级数为3.0。