外文翻译--离心泵问题的解决方案

Centrifugal pump question solution 1. to design the brand-new installment balance axial force Balancing unit request to design “the dense palace type damping flow channel pressure chamber” from pump delivery chamber design flow channel direct introduction high pressure Shui Daoxin, establishes one to be possible to change the pressure chamber intensity of pressure the installment dynamical equilibrium axial force.Entire design diagram as shown in Figure 5. Figure 6.5 dense palace type positive Nepal flow channel pressure chamber 1. Pump body 2. guide pulley 3. impeller 4. high pressure water population 5. axle sleeves 6.Protect plate 7, lO. axial seal the 8.U shape balance disc 9. water outlets 2. Axial force balancing unit principle of work Directs the high-pressured water from the water pump delivery chamber the fixed restricting, enters the pressure chamber through the restricting flow channel, the pressure chamber which rotates together along with the axis is composed by the fixed protection plate and the u shape balance disc, high pressure liquid effects Yu Uxing the balance disc surface, is opposite with the axial force direction, counterbalances mutually, balanced axial force. Releases the liquid from the damping flow channel which flows to return to the pump the entrance.The work impeller, the u shape balance disc and the main axle are the fixed relations, the government leader directive force is big, the entire wrap equipment towards left moves, causes the dense palace type flow channel cross section to reduce, the resistance enlarge releases the current capacity to reduce, causes the pressure chamber pressure enlarge, causes the balance force enlarge by the balanced axial force. The government leader directive force is small, works the impeller, the u shape balance disc and the main axle towards left moves few, the dense palace type flow channel overflow cross sectional area is big, the resistance reduces releases the current capacity to increase, the pressure chamber intensity of pressure reduces, the balance force reduces.The balance force changes along with the axial force change, causes two strength to be balanced throughout, guaranteed on the axis the impeller and the pump body, protect the plate and the balance disc not axial attrition. 3. Designs the dense palace type damping flow channel shape control pressure chamber pressure the size Dense palace type damping flow channel shape, the size size must consider the intensity of pressure the change process carries on the design, as shown in Figure 6 the resistance flow channel to divide into two parts. Figure 6.6 the resistance flow channel schematic drawing 1.Ring-like slit damping flow channel 2. has the ascent damping flow channel (1) Ring-like slit damping flow channel end motion small its damping change is not big, may regard as the constant. (2) Ras ascent damping flow channel its axial displacement definitely to be possible to obtain the slit closure the most major applied pressure, has the biggest reacting force. 4.Balance disc area of influence design Old style balance disc dependence support, the balanced axial force does not consider the area of influence the size, but the new style balancing unit must estimate the area of influence the size.After experiments and calculates: When introduces intensity of pressure when affects the intensity of pressure consistently with on the final level impeller after wheel disk, the balance disc area of influence with the impeller area is consistent. Third, design installment test result Experiment object for the multistage high-pressured centrifugal pump, the model is: DG155-67?7.The test result is: (1) Reduces obviously with other water pump movement comparison noise, the vibration reduces. (2)Exports pressure gauge reading 4MPa, reduces about 8% compared to the original water pump. (3) Ampere meter reading interphase current is 400A, compared to reduces about originally 20%. (4) Has slightly from the water outlet observation current capacity reduces, but is not obvious. (5) Main axle in axial has the slight fluctuation, is at the dynamical equilibrium condition. (6) After moves for half year, lends the balancing unit observation not axial to wear, oneself attains successfully. 1. Water pump working condition change analysis Passes through a period of time movement water pump to be in the main parameter current capacity, the intensity of pressure which the steady state displays has the drop, the power dissipation drops similarly.Its biggest merit was the new balancing unit had guaranteed the work impeller, the bearing, the balancing unit and so on the vulnerable long-term use, the service, the maintenance, the management cost straight line dropped. 2. High-pressured centrifugal pump overall effectiveness index, volumetric efficiency analysis The water pump overall effectiveness index may divide into the mechanical efficiency, the volumetric efficiency and the hydraulic efficiency, after because new design balancing unit contact friction elimination, mechanical efficiency enhancement.Uses the new balancing unit work impeller the front wheel cap no longer the wheel cap and the pump substrate has the gap with the pump substrate friction before, has divulging under the differential pressure function, simultaneously enters in the work impeller after wheel disk similar existence gap high pressure Water Classic axle sleeve gap to the pressure chamber in. Moreover to the pressure chamber in finally returns to the pump from the water pump exportation introduction high-pressured water the entrance.Increased front wheel disk divulging from the divulging angle new style balancing unit, establishes the pressure chamber to need the high-pressured water therefore causes the volumetric efficiency drop. 3. Promotion volumetric efficiency measure multistage high pressure centrifugal pump divulging quite many, after uses the new balancing unit to have to use the packing assembly seal to the work impeller front wheel cap spot, may establish the dense palace type seal packing collar to reduce divulging.The new balancing unit resistance flow channel design, the pressure chamber area of influence size design affects the backflow quantity size, the backflow quantity smaller volumetric efficiency is higher. The reasonable design and the good material quality as well as the precise processing manufacture may cause the backflow quantity control in the ideal scope. Fourth, conclusion Operates the flow channel from the delivery chamber to direct the high-pressured water directly to protect in the pressure chamber which the plate and the u shape balance disc forms, produces the reverse thrust and the axial force direction are opposite, the reverse thrust size the resistance size decided by “the dense palace type flow channel”, the resistance is big, the reverse thrust is big； The resistance is small, the reverse thrust is small.But “the dense palace type flow channel” the resistance size and the axial force size is proportional. Government leader directive force great time causes the pump spindle, increases to the induction port traverse, the dense palace type flow channel cross sectional area reduces, the resistance enlarge, the pressure chamber pressure increases the reverse thrust to increase.But the government leader directive force small time main axle reduces to the induction port travel motion, the dense palace type flow channel resistance reduces, the pressure chamber pressure reduces, the reverse thrust reduces. pump spindle directive force follow the relations, or said is along with changes the relations, the axial force increases the reverse thrust to increase, causes the reverse thrust to be equal to the axial force throughout, self-balancing axial force.Observes the pump main axle in the pump practical work in axial to have certain about migration (fluctuation), It reflects the reverse thrust and the axial force 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. 离心泵问题的解决方案 1设计全新装置平衡轴向力 平衡装置要求从泵的压出室设计流道直接引入高压水到新设计的“密宫式阻尼流道压力室”，建立一个可改变压力室压强的装置来动态平衡轴向力。整个设计简图如图 5所示。 图 6.5密宫式阻尼流道压力室 1.泵体 2.导轮 3.叶轮 4.高压水入口 5.轴套 6.保护 盘 7、 10.轴向密封 8.U形平衡盘 9.出水口 2轴向力平衡装置工作原理 把高压水从水泵的压出室引到固定保护套，通过保护套的流道进入到压力室，压力室由固定的保护盘和随轴一起回转的 u形平衡盘组成，高压液体作用于 u形平衡盘表面，与轴向力方向相反，相互抵消，平衡轴向力。从阻尼流道泄流出来的液体返回泵的入口处。工作叶轮、 u形平衡盘与主轴是固定关系，当轴向力大的时候，整套装置向左移动，使密宫式流道断面减小，阻力加大泄 流量减小，导致压力腔压力加大，使平衡力加大以平衡轴向力。当轴向力小的时候，工作叶轮、 u形平衡盘 与主轴向左移动少，密宫式流道过流断面面积大，阻力减小泄流量增加，压力室压强降低，平衡力减小。平衡力随着轴向力的变化而改变，始终使二力平衡，保证轴上的叶轮与泵体、保护盘与平衡盘无轴向的磨损。 3设计密宫式阻尼流道形状控制压力室压力的大小 密宫式阻尼流道形状、尺寸大小要考虑压强的变化过程来进行设计，如图 6所示阻力流道分为两部分。 图 6.6 阻力流道示意图 1.环形缝隙阻尼流道 2.有斜度的阻尼流道 (1)环形缝隙阻尼流道轴向移动小其阻尼变化不大，可看成常数。 (2)有斜度的阻尼流道其轴向位移完全可以把缝隙关闭获得最大的作用压力，产生最大反作用力。 4平衡盘作用面积设计 老式平衡盘依靠支撑，平衡轴向力不考虑作用面积的大小，而新式平衡装置必须估算作用面积的大小。经过试验与计算得：当引入的压强与最后级叶轮的后轮盘上作用压强一致时，平衡盘的作用面积跟叶轮的面积一致。 三、设计装置试验结果 试验对象为的多级高压离心泵，型号为： DG155-67 7。试验结果为： (1)与其他台水泵运行比较噪声明显降低，振动减小。