原文：
          泵型号意义：如40LG12－15 40－进出口直径（mm） LG－高层建筑给水泵（高速） 12－流量（m3/h） 15-单级扬程（M） 200QJ20-108/8 200---表示机座号200 QJ---潜水电泵 20—流量20m3/h 108---扬程108M 8---级数8级 水泵的基本构成：电机、联轴器、泵头（体）及机座（卧式）。 水泵的主要参数有：流量， 用Q表示，单位是M3/H ，L/S。扬程，用H表示，单位是M。 对清水泵，必需汽蚀余量（M）参数非常重要，特别是用于吸上式供水设备时。 对潜水泵，额定电流参数（A）非常重要，特别是用于变频供水设备时。 电机 的主要参数：电机功率（KW），转速中开泵 （r/min），额定电压（V），额定电流（A）。

           联轴器 泵头（体_） 卧式机座 什么叫流量？用什么字母表示？用几种计量单位？如何换算？如何换算成重量及公式？ 答：单位时间内泵排出液体的体积叫流量，流量用Q表示，计量单位：立方米/小时（m3/h）,升/秒（l/s）, L/s=3.6 m3/h=0.06 m3/min=60L/min G=Qρ G为重量 ρ为液体比重 例:某台泵流量50 m3/h，求抽水时每小时重量？料浆泵水的比重ρ为1000公斤/立方米。 解：G=Qρ=50×1000(m3/h·kg/ m3)=50000kg / h=50t/h

        什么叫扬程？用什么字母表示？用什么计量单位？和压力的换算及公式？ 答：单位重量液体通过泵所获得的能量叫扬程。泵的扬程包括吸程在内，近似为泵出口和入口压力差。扬程用H表示，单位为米（m）。泵的压力用P表示，单位为Mpa（兆帕），H=P/ρ.如P为1kg/cm2，则H=（lkg/ cm2）/(1000kg/ m3) H=(1kg/ cm2)/(1000公斤/m3)=(10000公斤/m2)/1000公斤/m3=10m 1Mpa=10kg/c m2,H=(P2-P1)/ρ (P2=出口压力 P1=进口压力)

        什么叫泵的效率？公式如何？ 答：指泵的有效功率和轴功率之比。油泵 η=Pe/P 泵的功率通常指输入功率，即原动机传到泵轴上的功率，故又称轴功率，用P表示。 有效功率即：泵的扬程和质量流量及重力加速度的乘积。 Pe=ρg QH (W) 或Pe=γQH/1000 （KW） ρ：泵输送液体的密度（kg/m3） γ：泵输送液体的重度 γ=ρg （N/ m3） g：重力加速度（m/s） 质量流量 Qm=ρQ (t/h 或 kg/s)

        什么叫额定流量，额定转速，额定扬程？ 答：根据设定泵的工作性能参数进行水泵设计，而达到的最佳性能，定为泵的额定性能参数，通常指产品目录或样本上所指定的参数值。 如：50-125 流量12.5 m3/h为额定流量，扬程20m为额定扬程，转速2900转/分 为额定转速

        什么叫汽蚀余量？什么叫吸程？各自计量单位表示字母？ 答：泵在工作时液体在叶轮的进口处因一定真空压力下会产生汽体，汽化的气泡在液体质点的撞击运动下，对叶轮等金属表面产生剥蚀，液下泵从而破坏叶轮等金属，此时真空压力叫汽化压力，汽蚀余量是指在泵吸入口处单位重量液体所具有的超过汽化压力的富余能量。单位用米标注，用（NPSH）r。吸程即为必需汽蚀余量Δh：即泵允许吸液体的真空度，亦即泵允许的安装高度，单位用米。 吸程=标准大气压（10.33米）-汽蚀余量-安全量（0.5米） 标准大气压能压管路真空高度10.33米。 例如：某泵必需汽蚀余量为4.0米，求吸程Δh？ 解：Δh=10.33-4.0-0.5=5.83米

           什么是泵的特性曲线？包括几方面？有何作用？ 答：通常把表示主要性能参数之间关系的曲线称为离心泵的性能曲线或特性曲线，实质上，离心泵性能曲线是液体在泵内运动规律的外部表现形式，通过实测求得。特性曲线包括：流量-扬程曲线（Q-H），流量-效率曲线（Q-η），流量-功率曲线（Q-N），流量-汽蚀余量曲线（Q-（NPSH）r），性能曲线作用是泵的任意的流量点，都可以在曲线上找出一组与其相对的扬程，功率，效率和汽蚀余量值，潜水泵 这一组参数称为工作状态，简称工况或工况点，离心泵最高效率点的工况称为最佳工况点，最佳工况点一般为设计工况点。

        一般离心泵的额定参数即设计工况点和最佳工况点相重合或很接近。在实践选效率区间运行，即节能，又能保证泵正常工作，因此了解泵的性能参数相当重要。 什么是泵的全性能测试台？ 答：能通过精密仪器准确测试出泵的全部性能参数的设备为全性能测试台。国家标准精度为B级。流量用精密蜗轮流量计测定，扬程用精密压力表测定。吸程用精密真空表测定。功率用精密轴功率机测定。转速用转速表测定。效率根据实测值：n=rQ102计算。

“ Pump Basics ”是由中国隔膜泵网提供的水泵行业新闻，译文仅供参考。另外，中国隔膜泵网还提供相关产品搜索：隔膜泵型号、隔膜泵价格、隔膜泵技术、隔膜泵新闻、隔膜泵生产商等。

译文：
             Pump Model significance: such as the 40LG12-15 40 - inlet and outlet diameter (mm) LG-rise building to the pump (high speed) 12 - Flow (m3 / h) 15 - Single lift (M) 200QJ20-108 / 8 200 --- that Frame 200 QJ --- Submersible Pump 20 - flow of 20m3 / h 108 --- lift 108M 8 --- Series 8 Pump basic components: motor, coupling, pump head (body) and base (horizontal). Pump main parameters are: flow, with Q that the unit is the M3 / H, L / S. Head, with H said, the unit is M. On clean water pumps, required NPSH Pneumatic and electric diaphragm pumps(M) parameter is very important, especially for absorbing the water supply equipment. Of the submersible pump, rated current parameter (A) is very important, especially for frequency of water supply equipment. Motor Specifications: Motor Power (KW), speed (r / min), Rated voltage (V), rated current (A). Coupling the pump head (body _) Horizontal base What traffic? What letters? In several units of measurement? How to convert? How to convert weight and formula? A: The unit of time is called the size of the pump discharge fluid flow, flow with Q that the units of measurement: cubic meters / hour (m3 / h), l / s (l / s), L / s = 3.6 m3 / h = 0.06 m3/min = 60L/min G = Qρ G ratio for the weight of liquid ρ Example: A pump flow of 50 m3 / h, the weight per hour of pumping demand? The proportion of water, ρ is 1000 kg / cubic meter. Solution: G = Qρ = 50 × 1000 (m3 / h · kg / m3) = 50000kg / h = 50t / h What is lift? What letters? What unit of measurement? And pressure of the conversion and the formula? A: The unit weight of the liquid through the pump energy obtained is called lift. Including suction lift pump Sweage pumps &Sludge pumpsincluded, similar to the pump outlet and inlet pressure difference. Head, H, units in meters (m). Pressure pump with a P said, in units of Mpa (MPa), H = P / ρ. If P is 1kg/cm2, then H = (lkg / cm2) / (1000kg / m3) H = (1kg / cm2) / (1000 kg / m3) = (10000 公斤 / m2) / 1000 公斤 / m3 = 10m 1Mpa = 10kg / c m2, H = (P2-P1) / ρ (P2 = outlet pressure P1 = inlet pressure) What is the efficiency of the pump? How the formula? A: The pump means the ratio of effective power and shaft power. η = Pe / P Pump power usually refers to the input power, which reached the shaft on the original motive power, it is also known as shaft power, with P said. Effective power that is: pump head and the mass flow rate and the acceleration of gravity of the product. Pe = ρg QH (W) or Pe = γQH/1000 (KW) ρ: the density of pumping liquid (kg/m3) γ: pumping liquid severe γ = ρg (N / m3) g: acceleration due to gravity (m / s) Mass flow rate Qm = ρQ (t / h or kg / s) What is the rated flow, rated speed, rated head? A: According to set performance parameters of the pump pumps designed to achieve the best performance, set performance parameters for the rated pump, usually a product catalog or samples on the specified parameters. As :50-125 flow 12.5 m3 / h rated Multi-stage pumpsflow and head 20m rated head, rotational speed 2900 r / into the rated speed What NPSH? What is suction? Each unit of measurement that letter? A: The pump impeller at work at the entrance of liquid due to a certain vacuum pressure will produce vapor, vaporization of the air bubbles in the liquid particle movement under the impact of the impeller and other metal surface erosion, thus undermining the impeller and other metal, then vacuum pressure is called vaporization pressure, NPSH is the entrance to the unit weight in pumping liquids with pressure more than the surplus energy of vaporization. Marked in meters, using (NPSH) r. Suction shall be required NPSH Δh: the suction pump to allow liquid vacuum, which allows the installation of the pump height in meters. Suction = standard atmospheric pressure (10.33 m) - NPSH - safe level (0.5 m) Standard atmospheric pressure to high vacuum pressure pipe 10.33 meters. For example: a pump required NPSH of 4.0 m, seeking suction Δh? Solution: Δh = 10.33-4.0-0.5 = 5.83 米 What is a pump characteristic curve? Covers the following areas? Them? A: Usually the main performance parameters that the relationship between the curve known as the centrifugal pump performance curve or characteristic curve, in essence, centrifugal pump performance curve is the motion of the liquid in the external manifestations of the law, obtained by measurement. Curve include: flow - lift curve (QH),Slurry pumps flow rate - efficiency curve (Q-η), flow rate - the power curve (QN), flow rate - NPSH curve (Q-(NPSH) r), the role of the performance curve arbitrary point of the pump flow rate, can find a group in the curve relative to its head, power, efficiency and cavitation than money, this set of parameters known as the working state, referred to as conditions or operating point, centrifugal pump conditions the maximum efficiency point as the best situation, the best situation for the design condition generally. The rated parameters of the general pump design point and the best situation coincides with or Other pumpsvery close. In practice, the efficiency of interval running the election, that is energy saving, but also ensures that the pump work correctly, so understand the important performance parameters of the pump. What is the full performance of the pump test bench? A: through precision instruments accurately measuring all performance parameters of the pump equipment for the whole test bench. National standards for the B-level accuracy. Determination of flow meter with precision worm gear, head measured with a precision pressure gauge. Suction measured with a precision vacuum table. Power measured with a precision shaft power machine. Speed measured with a tachometer. Efficiency according to measured values: n = rQ102 calculation.

原文来源：http://www.1gemobeng.com/

2010-09-01 06:59

返回