外文翻译--多级泵

Centrifugal pumps Introduction:it can reflect the multistage pumping station optimal operation guidelines for many. Optimal scheduling model. The model can be solved by dynamic programming the optimal unit commitment of all stations. Using the mathematical model to find the optimal operation combination. Dynamic programming, optimal scheduling problem of multi-stage pumping stations. Multistage pump by computer design and optimization of processing, the company has strong technical force, rich production experience and improve the detection means, to ensure product quality is stable and reliable. Multistage pump, horizontal, single suction multistage, segmental centrifugal pump. With high efficiency, wide range of performance, the safe operation of the smooth, low noise, long service life, convenient installation and repair etc. For the transport of water or similar physical and chemical properties in water and other liquids. You can change the pump flow components, sealing material form and increase the cooling system is used for conveying hot water, oil, corrosive or abrasive particles of the medium. Product implementation of JB / T1051-93 multistage rinsing centrifugal pump - Types and basic parameters of the standard. Key words: multistage pumping stations, optimal dispatching, dynamic programming, mathematical model. One, multistage pump structure multistage pumps mainly composed of a stator, rotor, bearings and seal of four parts: 1, multi-stage pump stator is mainly composed of a suction section, middle paragraph and out, such as guide vane component, there w ill be tension bolt clamping paragraphs, posing in studio. D type pump general level of aspiration, vertical spit up； used in oilfield w ater injection, pump inlet and outlet are vertical upw ard. DG type multistage pump, entrance are vertical upw ard. 3, multi-stage pump bearings by the bearing body, a bearing and a bearing gland components, bearings w ith grease or oil lubrication. 4, multi-level soft packing shaft seal sealing, mainly by w ater and the end cover of the sealed box body, filler, composed of the retaining ring. D type pump w ater pump w ater from the pressure of the w ater. DG type pump seal w ater from an external w ater supply. In 5, the multi-stage pump rotary pump through the flexible coupling driven directly by the original motivation. From the original motivation depends on the pump, pump is clockwise, D type DG pump is a horizontal single suction multi-stage centrifugal pump. For the transport of water ( containing impurity is less than 1%, particle size of less than0.1mm ) or similar physical and chemical properties in water and other liquids. D type pump for transporting medium temperature less than 80 DEG C, suitable for mine drainage, water flooding, factories and city to, drainage and other occasions. Oilfield water injection pump according to corrosion, pump using different materials. DG type pump for transporting medium temperature less than 105 DEG C, applicable to all kinds of boiler feed w ater Tw o tw o, multistage pump w ith single stage pump difference 1, single-stage pump is the only one of the pump impeller, the maximum lift is only 125meters； 2, pump refers to two or more than tw o of the pump impeller, the maximum can lift more than125 m； Multistage pump head in a single-stage pump needs must be equipped w ith tw o motor case, through an increase in the number of impeller w ith four motors, w hich can increase pump life and reduce the noise of the unit, but the multistage pump repair relative single stage pump is a little difficult. In3, the actual needs of pump head is less than 125 meters, the area under the pumping station, pump prices ( in general multi-stage pump prices than the high single-stage pump ), and other factors to consider in the selection of a single-stage pump or pump. With the development of technology, single-stage impeller pump can pump by increasing the speed to increase the pump head, instead of multistage pump, but the price is a little. In three, the multi-stage pump maintenance and operations management attention Pump pow er to be divided into tw o areas with the machine, the machine, the main maintenance records of the previous tune out than you know . The second is the aspect of pow er, to understand the pow er of each pump motor, control system of his understanding of a certain four multistage pump maintenance and operations management attention Pump pow er to be divided into tw o areas with the machine, the machine, the main maintenance records of the previous tune out than you know . The second is the aspect of pow er, to understand the pow er of each pump motor, control system of his understanding of a certain. Five stage pump parameter D and DG series multi stage centrifugal pumps 流量： 6.3450 立方米每小时 扬程 75685 米 HEAD: 75685 米 Capacity:6.3450 立方米每小时 电机 功率： 5.51050kw Motor power： 5.51050kw 产品标准： JB/T1051-93 Product standard： JB/T1051-93 The examination of multistage pump, pipeline and combined w ith or w ithout loosening. Manual rotation of multistage pump, multistage pump is flexible at. The bearing body, to join the bearing lubricating oil, the oil level should observe subject at the center line, the lubricating oil should be replaced or supplemented. The multistage pump, unscrew the diversion plug, pouring w ater diversion ( or lead paste ). For, close outlet pipeline valve and outlet pressure gauge and vacuum gauge. In, move the motor, look at the motor turning right or not. As a long-term disabled, multistage pump, the pump all open, dry moisture, the rotating part and joint coated w ith grease. He tried to control multistage pump, flow and head in signs marked on the range, to ensure that the multistage pump at maximum efficiency point operation, in order to achieve maximum energy saving effect. The, multistage pump during operation, bearing temperature can not be higher than ambient temperature35C, the highest temperature not exceeding80C. If, as is found in multistage pump w ith abnormal sound should stop and check the reason. I, multistage pump to stop, and then close the valve, pressure gauge, then stop the motor. We, multistage pump at w ork within the first month,100 hours after the replacement of lubricants, later every500 hours, changing time. In daily life, multi-stage pumps often adjust gland packing leakage, ensure indoor normal ( to drop out as appropriate ). Province, regularly check the pump shaft sleeve wear condition, wear a larger should be replaced after. , multi-stage pump in the w inter season, when in use, after stopping the pump body, low er drain plug unscrew medium placed net. To prevent the frost crack. , the motor is started, when the multi-stage pump of normal operation, to open the outlet pressure gauge and vacuum pump as the show proper pressure, gradually open the gate, at the same time to check the electrical load. Seven stage pump classification Multistage pump series, according to the different appearance is divided into: vertical and horizontal multistage pump. In accordance with the lumber is divided into: stainless steel multi-stage pump, multistage pump, LG Da multistage pump. Eight stage pump w orking principle: Multistage pump is a centrifugal pump, but also depend on the rotation of the impeller centrifugal force in the acquisition, thus materials. Gas density to be the scope of work of mechanical vacuum pumps w as drawn out, thereby gaining high vacuum. In the multi-stage pump body w ith the right amount of w ater as the working fluid. When the impeller rotates clockwise direction, the w ater was thrown around the impeller, due to the effect of centrifugal force, the water decided to form a pump cavity such as the shape similar to the thickness of the closed ring. The next part of the water ring coincides with the inner surface of the impeller w heel tangent, w ater ring coincides with the inner surface of the upper leaves of the top contact ( in fact the leaves in the w ater ring within a certain depth). At this point the impeller w heel and the w ater form a crescent-shaped space between the rings, and this space has been divided into the impeller and blades of an equal number of a number of small. If the low er 0degrees as a starting point, then the impeller rotating180 degrees in front of the cavity volume from small to large, and w ith the end of the suction mouth is communicated, the gas is inhaled, when the suction end and the inlet cavity is isolated； w hen the impeller continues to rotate, the small chamber by a small change, make the gas is compressed； w hen the cavity connected with the exhaust port, the gas w ill be discharged out of the pump. To sum up, the multi-stage pump is a pump chamber on the changes in volume to achieve suction, compression and exhaust, so it can be a variable volume pump. Multistage pump can be used for petroleum, chemical, machinery, mining, light industry, medicine and food, and many other industrial sectors. In industrial production in many processes, such as vacuum filter, vacuum diversion, the vacuum feed, vacuum evaporation, vacuum concentration, vacuum and vacuum degassing resurgence, multistage pumps are w idely used. Pumping flammable, explosive gas, can also be pumping gas containing dust, moisture, therefore, water ring pump applications is increasing. Fault: w ater pump suction pressure gauge and vacuum gauge pointer severe beating Reason. 1perfusion diversion is not enough The 2pipeline and meter joint leakage 3smoke w ay too high Method. The 1check valve or w ater leakage. Hire foot diversion 2 tightening the air leakage 3 low er high w ater Fault: w ater pump suction vacuum meter show s high vacuum Reason. The 1valve is not open or has been blocked The 2pipeline resistance is too large The 3filter clogging Method. The 1check valve 2 replacing absorbent 3clean the filter. Fault: pressure gauge pressure but still no w ater Reason. The 1 outlet pipe resistance is too large 2w rong direction of rotation The 3outlet pipe valve open 4impeller blocked Method. 1check or short pipe string 2check motor tw o-phase intermodulation. 3open the outlet valve 4 clearance of impeller in the dirt Fault: can not reach the design flow Reason. 1air In 2 due to low er the w ater level submerged depth is not enough, 3 impeller w ith blockage The 4 rotor part of serious wear Method. 1check the leak site and exclusion 2 extended suction pipe. Deepen the depth of submergence 3 removing and drops in addition to foreign body 4replacing sealing bad Failure: excessive pump pow er consumption Reason. 1packing pressed too tight and fever. The2stream is too large The 3rotary body and the shell has rubbed The 4 pump bearing w ear 5shaft bending Method. 1appropriate relaxation 2off a small valve opening 3w hole 4bearing replacement 5 replacement or correction Fault: pump vibration increase Reason. 1local clogging impeller 2 impeller damage 3little capacity 4pump shaft and the motor are not concentric 5bearing damage 6mixed air cavitation. Method. 1 removing foreign body removal 2more change 3 slightly open outlet valve 4point centering 5more change 6 the change of suction. Improving w ater absorption tube Ten multistage pump installation This type pump installed in addition to meet the general installation technical requirements, should also pay attention to the follow ing points: In 1, the motor and the pump assembly is installed, should w ill pump coupling end axial pull out, and stay35mm end clearance values, to ensure that the pump and motor coupling betw een two axial clearance value. Note : identification of plate leveling, good equipment levels after grouting Caution: to make a successful installation, coupling adjustment must be correct, flexible coupling can compensate for any obvious disorders. Disorders may cause rapid w ear, noise, vibration and equipment damage. Therefore, coupling must be in to limit adjustment. Be careful: measures must be taken to support pump import and export pipeline, to prevent the import and export pump overload In 2, the pump and motor shaft center line should be at the same horizontal line. In 3, the pump can w ithstand the internal force, not w ithstanding any external force. Multistage pump starting, running, stopping ( a ) starting: Warning: for the safety, please do not go beyond the pump nameplate conditions of operation, so as not to endanger the safety of equipment and operators. In order to ensure the operation and repair pumps and other moves smoothly, please refer to the instruction manual. In 1, the pump before starting moving rotor disk, to check w hether the flexible rotor. 2, check the shift motor and pump consistent turning. 3, close pump outlet valve, pressure gauge plug, used for conveying liquid or vacuum system to exclude the suction pipe and pump in the air ( no empty run ). 4, check the pump and motor coupling bolt tightness and security situation around the pump, pump is ready to start state. Warning: in the fitted coupling guard, equipment to operate, ignore this point w ill cause casualties. In 5, starting the pump, to pump in normal operation, the pressure gauge cocks, slowly open the outlet valve, outlet pressure gauge control according to the given lift pump. ( tw o) running: In 1, this type of pump inner balance mechanism to balance axial force balance device, balance liquid outflow , equilibrium liquid balance pipe is connected to the suction section by. In 2, the rolling bearing of the pump w ith cooling device, pump operation must be before the cooling w ater pipes are connected. Bearing temperature rise reflects the variation of the pump assembly quality, bearing temperature rise shall not be higher than the ambient temperature of 35DEG C, the highest temperature shall not be higher than 75DEG c. Warning: not suitable lubrication equipment operation, may cause fever, bearing fracture, pump blockage and equipment damage, and the operator is injured. In 3, this type of pump rotor operation in the presence of a certain axial w alk, should ensure that the motor and the pump shaft coupling betw een two end surface clearance. 4, pump during operation shall be inspected regularly impeller, seal ring, sets of guide vanes, balance disc, the w ear sleeve, w orn seriously shall timely replacement. Warning: do not try to rotating machinery repair, maintenance or cleaning near, it w ill endanger the personal safety of operating personnel. 5, the user should be based on specific circumstances set out a detailed operating procedures. ( three) parking: parking should first before clearance gauge cock, then slow ly close the exit gate, to the exit gate closed to stop after motor 多级泵 导读：能反映多级泵站优化运行调度的准则很多。优化调度模型的建立。上述模型可由动态规划求解出各级站的最优开机组合。运用数学模型找到最优的运行组合。动态规划，多级泵站优化调度问题研究。 多级泵采用计算机设计和优化处理，公司拥有雄厚的技术力量、丰富的生产经验和完善的检测手段，从而保证产品质量的稳定可靠。多级泵、卧式、单吸多级、分段式离心泵。具有效率高、性能范围广、运行安全平稳、噪音低、寿命长、安装维修方便等特点。供输送清水或物理化学性质类似于水的其它液体。也可以通过改变泵过流部件材质、密封形式和增加冷却系统 用于输送热水、油类、腐蚀性或含磨粒的介质。产品执行 JB/T1051-93多级清水离心泵型式与基本参数标准。 关键词：多级泵站，优化调度，动态规划，数学模型 一、 多级泵结构 多级泵主要由定子、转子、轴承和轴封四大部分组成： 1、多级泵定子部分主要由吸入段、中段、吐出段和导叶等组成，有拉紧螺栓将各段夹紧，构成工作室。 D 型泵一般水平吸入，垂直向上吐出；用于是油田注水时，泵进出口均垂直向上。 DG 型多级泵出、入口均垂直向上。 2、多级泵转子部分主要由轴、叶轮、平衡盘和轴套等组成。轴向力由平 衡盘平衡。 3、多级泵轴承主要由轴承体、轴承和轴承压盖等组成，轴承用油脂或稀油润滑。 4、多级泵轴封采用软填料密封，主要由进水段和尾盖上的密封函体、填料、挡水圈等组成。 D 型泵水封水来源于泵内的压力水。 DG 型泵水封水来源于外部供水。 5、多级泵转动 泵通过弹性联轴器由原动机直接驱动。从原动机端看泵，泵为顺时针方向旋转 D 、 DG 型泵是卧式单吸多级节段式离心泵。供输送清水（含杂质量小于 1% ，颗粒度小于 0.1mm ）或物理化学性质类似于水的其它液体。 D 型泵输送介质温度小于 80 ，适用于矿山排水、油田注水、工厂和城市给、排水等场合。油田注水泵根据介质的腐蚀性，泵采用不同的材质。 DG 型泵输送介质温度小于 105 ，适用于各种锅炉给水。 二 二 、 多级泵与单级泵区别 1、单级泵是指只有一只叶轮的泵，最高扬程只有 125 米； 2、多级泵是指有两只或两只以上叶轮的泵，最高扬程可以超过 125 米； 多级泵在单级泵扬程需要必须配两级电机的情况下，可以通过增加叶轮个数来配用四级电机，从而可以提高泵使用寿命和降低机组噪音，但是多级泵维修相对单级泵来说要困难一点。 3、在 泵实际需要扬程小于 125 米时，可根据泵房面积、泵价格（多级泵一般比单级泵价格偏高）、等因素综合考虑该选用单级泵还是多级泵。 随着技术的进步，单级叶轮的泵可通过提高泵的转速来提高泵的扬程，可代替多级泵，只是价格贵一点。 三、多级泵的管理维护及作业注意事项 泵要分为电与机两个方面，对于机的方面，主要把以前的维护记录调出来比对一下就知道了。 其次就是电的方面了 ，要了解每台泵电机的功率，对他的控制系统有一定的了解四 多级泵的管理维护及作业注意事项 泵要分为电与机两个方面，对于机的方面，主要把以前的维护记录 调出来比对一下就知道了。 其次就是电的方面了 ，要了解每台泵电机的功率，对他的控制系统有一定的了解。 五 多级泵参数 D and DG series multi stage centrifugal pumps 流量： 6.3450 立方米每小时 扬程 75685 米 HEAD: 75685 米 Capacity:6.3450 立方米每小时 电机功率： 5.51050kw Motor power： 5.51050kw 产品标准： JB/T1051-93 Product standard： JB/T1051-93 六 多级泵系列的维护与保养： 、检查多级泵管路及结合处有无松动现象。用手转动多级泵，试看多级泵是否灵活。 、向轴承体内加入轴承润滑机油，观察油位应在油标的中心线处，润滑油应及时更换或补充。 、拧下多级泵泵体的引水螺塞，灌注引水（或引浆）。 、关好出水管路的闸阀和出口压力表及进口真空表。 、点动电机，试看电机转向是否正确。 、多级泵长期停用，需将泵全部拆开，擦干水分，将转动部位及结合处涂以油脂装好。 、尽量 控制多级泵的流量和扬程在标牌上注明的范围内，以保证多级泵在最高效率点运转，才能获得最大的节能效果。 、多级泵在运行过程中，轴承温度不能超过环境温度 35C，最高温度不得超过 80C 。 、如发现多级泵有异常声音应立即停车检查原因。 、多级泵要停止使用时，先关闭闸阀、压力表，然后停止电机。 、多级泵在工作第一个月内，经 100 小时更换润滑油，以后每个 500小时，换油一次。 、多级泵经常调整填料压盖，保证填料室内的滴漏情况正常（以成滴漏出为宜）。 、定期检查多级泵轴套 的磨损情况，磨损较大后应及时更换。 、多级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。防止冻裂。 、开动电机，当多级泵正常运转后，打开出口压力表和进口真空泵视其显示出适当压力后，逐渐打开闸阀，同时检查电机负荷情况。 七 多级泵的分类 多级泵系列很多，按照外观不同分为：立式多级泵和卧式多级泵。 按照制材不同分为：不锈钢多级泵、 lg 多级泵、 da 多级泵。 八 多级泵的工作原理： 多级泵是离心泵的一种，也是依靠叶轮的旋转在获取离心力，从而物料。待气体密度 达到机械真空泵的工作范围而被抽出 ,从而逐渐获得高真空。 在多级泵体中装有适量的水作为工作液。当叶轮按顺时针方向旋转时，水被叶轮抛向四周，由于离心力的作用，水形成了一个决定于泵腔形状的近似于等厚度的封闭圆环。水环的下部分内表面恰好与叶轮轮毂相切，水环的上部内表面刚好与叶片顶端接触（实际上叶片在水环内有一定的插入深度）。此时叶轮轮毂与水环之间形成一个月牙形空间，而这一空间又被叶轮分成和叶片数目相等的若干个小腔。 如果以叶轮的下部 0为起点，那么叶轮在旋转前 180时小腔的容积由小变大，且与端面上的吸 气口相通，此时气体被吸入，当吸气终了时小腔则与吸气口隔绝；当叶轮继续旋转时，小腔由大变小，使气体被压缩；当小腔与排气口相通时，气体便被排出泵外。 综上所述，多级泵是靠泵腔容积的变化来实现吸气、压缩和排气的，因此它是可以变容积的离心泵。 多级泵可用于石油、化工、机械、矿山、轻工、医药及食品等许多工业部门。在工业生产的许多工艺过程中，如真空过滤、真空引水、真空送料、真空蒸发、真空浓缩、真空回潮和真空脱气等，多级泵得到广泛的应用。可抽除易燃、易爆的气体，此外还可抽除含尘、含水的气体，因此，水环泵应用日益增 多。 九 多级泵的常见问题 ？ 故障：水泵不吸水压力表和真空表指针剧烈跳动 原因： 1.灌注引水不够 2.管路与仪表联接处漏气 3.吸程过高 方法： 1.检查底阀是否漏水 .再雇足引水 2.拧紧漏气处 3.降低吸水高度 故障：水泵不吸水真空表表示高度真空 原因： 1.底阀没有打开或己堵塞 2.吸水管路阻力太大 3.过滤器堵塞 方法： 1.检査底阀 2.更换吸水 3.清理过滤器 故障：压力表有压力但仍 不出水 原因： 1.出水管阻力太大 2.旋转方向不对 3.出口管阀门未开 4.叶轮堵塞 方法： 1.检査或缗短水管 2.检査电机 .两相互调 3.打开出口阀 4.清除叶轮内的污物 故障：达不到设计流量 原因： 1.有空气吸入 2.由于水位降低 .淹没深度不够， 3.叶轮内有异物堵塞 4.转子部分严重磨损 方法： 1.检査漏气部位并排除 2.延长吸水管 .加深淹深度 3.拆卸并滴除异物 4.更换密封坏 故障：泵消耗功率过大 原因： 1.填料压得过紧 .并发热 2.流置过大 3.回转体与壳体有碰擦 4.泵轴承磨损 5.泵轴弯曲 方法： 1.适当放松 2.关小闸阀开度 3.修 整 4.更换轴承 5.更换或校正 故障：泵振动加大 原因： 1.叶轮局部有堵塞 2.叶轮破损 3.流量过小 4.泵轴与电动机不同心 5.轴承破损 6.混入空气 .发生汽蚀 方法： 1.拆卸清除 异物 2.更 换 3.稍开出口阀 4.定点找正 5.更 换 6.改变吸入位 .改善吸水管 十 多级泵的安装使用 本型泵安装时除满足一般安装技术要求外，还应当注意以下几点： 1、 电机与水泵组合安装时，应当将泵联轴器端的轴向外拉出，并再留 3 5mm 端面间隙值，以保证泵和电机两联轴器之间的轴向间隙值。 注意： 确定底板调平，设备水平度良好后再进行灌浆 小心： 为使安装成功，联轴器调整必须正确，挠性联轴器不能补偿任何明显的失调。失调可能引起快速的磨损、噪音、振动和对 设备的损坏。因此，联轴器必须在所给限度内调整。 小心： 必须采取措施支撑泵的进出口管道，防止泵进出口负荷过大 2、 泵与电机轴的中心线应在同一水平直线上。 3、 泵只能承受自身内力，不能承受任何外力。 多级泵的起动、运行、停车 (一 )起动： 警告： 为了操作者的安全起见，请勿超越泵铭牌的条件进行操作，以免危及设备和操作人员的安全。为保证操作和维修泵及其它动作的顺利进行，请参考说明书进行。 1、 泵起动前应先盘动转子，检查转子是否灵活。 2、 检查电机转向是否与泵的 转向一致。 3、 关闭泵出口闸阀、压力表旋塞，用输送的液体或真空系统排除吸 入管和泵体内的空气（严禁空车启动运行）。 4、 检查泵与电机联接螺栓的松紧度和泵周围的安全情况，使泵处于准备起动状态。 警告： 在装好联轴器护罩后，设备才能操作，忽略该点会引起人员伤亡。 5、 起动泵，待泵运转正常后，打开压力表旋塞，慢慢开启出口闸阀，按出口压力表读数控制泵给定的扬程。 (二 )运行： 1、 本型泵靠内平衡机构平衡轴向力，平衡装置有平衡液体流出，平衡液体由平衡水管接至吸入段。 2、 本型泵滚动轴承均有冷却装置，水泵运行前必须将冷却水管连接好。轴承温升变化反映了泵的装配质量，轴承温升不得高于环境温度 35 ，最高温度不应高于 75 。 警告： 对未适当润滑的设备进行操作，可能引起轴承发热、断裂、泵的堵转和设备的损坏，并使操作人员受到人身伤害。 3、 本型泵转子在运行中存在一定的轴向游动，应保证电机和水泵两联轴器端面间的间隙值。 4、 泵在运行期间应当定期检查叶轮、密封环、导叶套、平衡盘、轴套的磨损情况，磨损量过大应当及时更换。 警告： 请勿尝试在旋转机械附近进行维修、保 养或清理，否则会危及操作人员人身安全。 5、 用户应根据具体情况订出较详细的操作规程。 (三 )停车：停车前应当先关压力表旋塞，再慢慢关闭出口闸阀，待出口闸阀关闭完毕后才能停电机 十一 泵站优化 导读：能反映多级泵站优化运行调度的准则很多。优化调度模型的建立。上述模型可由动态规划求解出各级站的最优开机组合。运用数学模型找到最优的运行组合。动态规划，多级泵站优化调度问题研究。 关键词：多级泵站，优化调度，动态规划，数学模型 1.介绍 随着工业生产力的提高 , 水泵广泛应用于国民经济的各个 部门，供水系统的规模也在不 断扩大 ,复杂性也随之提高。正是水泵的广泛应用 ,使得水泵的能耗约占全国 由于吴堡工业园区供水系统这个项目处于可研阶段，实测数据缺乏，本模型验证只能采用设计数据进行优化横沟到慕家塬三级泵站的最优开机方案，并与设计数据进行分析比较，得到优化结果。 计算过程运用 Flex 语言编程进行求解，采用可视化界面，对各级泵站进行优化计算。下列 多级离心泵 的工作原理与地面 离心泵 一样，当 电机 带动轴上的 叶轮 高速旋转时，充满在叶轮内的液体在 离心力 的作用下，从叶轮中心沿着叶片间的 流道 甩向叶轮的四周，由于液体受到叶片的作用，使压力和速度同时增加，经过导壳的流道而被引向次一级的叶轮，就是这样原理，逐次地流过所有的叶轮和导壳，进一步使液体的压力能量增加。将每个叶轮逐级叠加之后，就获得一定 扬程 ，将井 下液体举升