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编号：23270745
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上传时间：2019-11-08
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认证信息
个人认证
李**（实名认证）
江苏
IP属地：江苏
30
积分
- 关 键 词：
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离心
水泵
设计
- 资源描述：
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离心式水泵的设计,离心,水泵,设计
- 内容简介：
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河南理工大学万方科技学院毕业论文附录：外文资料与中文翻译外文资料： Multistage high-pressured centrifugal pump axial force balancing unit research and applicationAbstract Multistage high-pressured gentrifugalism gathers the existence efficiency lowly。 The energy consumption high, the maintenance cost high question.uses one brand-new method。 “The dynamical equilibrium axial force” causes the multistage high-pressured centrifugal pump main axle through the establishment pressure chamber to do “the fluctuation condition” in the axial direction place to protect the plate and the u shape equalizing ring non-contact friction. Key word ： Axial force Pressure chamber Fluctuation Dense palace type damping flow channel The single suction two level of above high pressure centrifugal pumps display the rice the axial force. Affects the centrifugal pump seriously the normal work, under axial action of force, balance disc and balance disc contact friction. After wears to certain degree. The main axle, works the impeller to the water inlet traverse, the cause work impeller and the cabinet friction. The electric motor load enlarge, current capacity lifting drops, if does not replace the balance disc and the equalizing ring appears the electric motor overburning the phenomenon.Single suction high pressure centrifugal pump axial force production and influence, as well as existing solution.Two level of above high-pressured centrifugal pumps, along with lifting enhancement. The axial force increases unceasingly, for example: 90 lifting two levels of centrifugal pumps, the axial force is small, but the old style balance disc and the equalizing ring may use for a month the 460m lifting seven level of high-pressured centrifugal pump,。The axial force are big, the old style balance disc and the equalizing ring may use for a week. The axial force size has decided the old style balance disc and the equalizing ring service life.Pump lifting is higher,。The axial force is bigger, the service life lower axial force size affects the old style balance disc, The equalizing ring life as well as the labor ashamed impeller life. Affects electric motor power dissipation size old style balance disc as shown in Figure 1: Figure 1 old style balance disc, equalizing ring assembly schematic drawingThe balance disc rotates together which with the pump spindle abuts under the axial force function in and the pump body association on the same place equalizing ring, equalizing ring withstanding huge axial force.The link and the plate appear the serious attrition, Along with running time extension, when the attrition depth is 3 6mm, components migrations and so on axis, work impeller, axle sleeve, works the impeller and the pump body contact friction, the pump body and the impeller starts to wear, the electric motor consumed power increases, when wears 3mm (through observes electric motor and pump shaft coupling gap), with the pump straight association electric motor comes under the serious influence, appears burns down the electric motor the phenomenon.old style balance disc attrition as shown in Figure 2. Figure 2 old style balance disc attrition1. Axial force production Single suction type centrifugal pumps, regardless of the progression change all has the axial force, this is because the work impeller entrance spot is the low pressure exports and the work impeller back is a high pressure, in the work impeller front wheel cap, the latter wheel disk forms differential pressure this differential pressure, has formed the axial force, as shown in Figure 3: Figure 3 Differential pressure axial force schematic drawing2. Axial force sizes and directionAxial force size and two factors related:Is proportional with the differential pressure size, or said is proportional with the centrifugal pump exportation intensity of pressure and the entrance intensity of pressure difference.To the multistage high-pressured centrifugal pump, the intensity of pressure which the water pump exports quite is big, but the entrance intensity of pressure is at the negative pressure condition, causes the axial force by the intensity of pressure quite to be big. Is proportional with the area of influence, works the impeller diameter to be bigger, the area of pressure is bigger, the axial force is bigger.Seven level of high-pressured centrifugal pumps, if each level of differential pressures are consistent, the area of pressure is seven work impeller compression face sum product.Its general pressure may express is:F=In the formula of- in axial action in the impeller sum of all pressure; - in axial action in single work impeller intensity of pressure difference; - work impeller compression face sum product. The axial force direction along axial starts from the exportation to affect to the entrance.The function on each work impeller differential pressure is through the axial localization axle sleeve function on the main axle, on the main axle axial force is on many work impeller the differential pressure superimposition. （1）Axial force destructive effect axial force causes the following several aspdestructive effect:Attrition balance disc and equalizing ring. Breaks by rubbing the work impeller the front wheel disk, wears the pump body.Damage pump supporting bearing.The power loss increases, the efficiency is low.The dragging electric motor load enlarge, burns down the electric motor.In the single suction high pressure centrifugal pump practical work, the equalizing ring is fixes together in with organism, the balance disc makes high speed revolving along with the axis, has the reverse thrust with the balance disc and the equalizing ring contact to balance the axial force, because the balance disc and the equalizing ring wear (5-8mm), the axis and the work impeller to the population traverse, cause the work impeller and the pump body (substrate) the close contact, rubbed mutually, has formed the good coordination, Front exports the high pressure region the liquid to enter the wheel cap gap with difficulty, causes in the air inlet scoop front wheel cap function intensity of pressure is very small, but works the impeller after wheel disk and the high pressure region gap quite is big (5mm), the exportation intensity of pressure is not weaken affects on after wheel disk, forms the big axial force.The pump body is rubbed in under the axial force long time function by the impeller deep 5mm, the impeller front wheel coverlet rubs thinly.Figure 4 is the pump body is worked the condition which the impeller wears: Figure 4 Pump body attrition schematic drawing Sees from Figure 4: Is rubbed the depth moreover smoothly with the air inlet scoop contact pump body, at the same time the impeller front wheel cap wears also smooth.The work impeller front wheel cap crustification makes high speed revolving in the pump body.The moment of resistance causes the electric motor the power loss to increase even the overload, because the electric motor and the water pump are the straight association are very easy to burn down the electric motor.(2) Axial force destructive effect existing solutionHigh pressure centrifugal pump in order to overcome the axial force to adopt many and varied methods.Some use thrust bearing, some use hydraulic unit, some use double pump body solution, some use the balancing hole and the compensating pipe method on the work impeller, it has the characteristic respectively.The common method is uses the balance disc and the equalizing ring supports the axial force, is equal in a surface contact axial thrust bearing.But because a fixed high speed revolving, the pressure high, simultaneously in the liquid includes the pellet attrition to be very quick.in the dynamic balance process.After moves half year about time dismantles the new balance disc and the equalizing ring the observation, in the axial non-contact friction, works the impeller no longer with organism contact friction. 中文翻译：多级高压离心泵轴向力平衡装置研究与应用摘要：多级高压离心泵存在效率低、能耗高、维护成本高的问题。采用一种全新的方法，通过建立压力室“动态平衡轴向力”使多级高压离心泵主轴在轴向方向处于“浮动状态”保护盘与u形平衡环无接触摩擦。 关键词： 轴向力 压力室 浮动 密宫式阻尼流道单吸两级以上高压离心泵表现出米的轴向力严重影响离心泵的正常工作， 在轴向力作用下，平衡盘与平衡盘接触磨擦。当磨损至一定程度，主轴，工作叶轮向进水口方向移动，致使工作叶轮与机壳磨擦。电动机负载加大，流量扬程下降，若不更换平衡盘与平衡环则出现电动机烧毁的现象。单吸高压离心泵轴向力的产生和影响，以及现有的解决方法。两级以上高压离心泵，随着扬程的提高，轴向力不断增大，例如：90m扬程的二级离心泵，轴向力小，老式平衡盘与平衡环可使用一个月。而460m扬程的七级高压离心泵，轴向力大，老式平衡盘与平衡环可使用一个星期。轴向力的大小决定了老式平衡盘与平衡环的使用寿命。泵的扬程越高，轴向力越大，使用寿命越低轴向力的大小影响老式平衡盘，平衡环的寿命以及工怍叶轮的寿命。影响着电动机功率消耗的大小老式平衡盘如图1所示： 图1老式平衡盘、平衡环装配示意图 与泵轴一起回转的平衡盘在轴向力的作用下紧靠在与泵体联在一起的平衡环上，平衡环承受巨大的轴向力。环与盘出现严重磨损，随着运行时间的延长，当磨损深度为36mm时，轴、工作叶轮、轴套等零件移动，工作叶轮与泵体接触摩擦，泵体和叶轮开始磨损，电动机消耗功率增大，当磨损3mm(通过观察电动机与泵的联轴器的间隙)时，与泵直联的电动机将受到严重的影响，出现烧毁电动机的现象。老式平衡盘的磨损如图2 图2老式平衡盘磨损照片1轴向力的产生 单吸式离心泵，无论级数变化都存在着轴向力，这是因为工作叶轮入口部位是低压而出口及工作叶轮背部是高压，在工作叶轮的前轮盖，后轮盖形成压
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