GCB型高速磁力泵系列开发

GCB型高速磁力驱动泵体积小、重量轻、无泄漏、安全可靠,能满足船舶、航空等特定场合的使用要求。本课题组开发了400Hz高速磁力泵系列,给出了该泵的系列参数,介绍了该系列泵的结构特点:隔离套和泵轴构成一体,是静止件;内磁钢和叶轮为一体,构成内磁转子。这种结构保证了泵机组尺寸小、重量轻。阐述磁力泵吸入口设置轴向可变位的导流栅解决高转速下易导致的汽蚀问题;设计采用了密集型聚磁磁性联轴器缩小了转子外径;利用冷却循环回路的压力降来平衡轴向力以及采用F50C新型耐磨滑动轴承提高泵的使用寿命等关键技术。经试验验证,本高速磁力泵抗汽蚀性能好、噪声低、运行平稳,可广泛推广应用。     

醋酸深加工装置釜液磁力泵的设计

分析了10万吨醋酸深加工装置中釜液磁力泵的使用特点,着重论述了高温强腐蚀条件下磁力泵的磁力联轴器、滑动轴承与推力盘的设计、制造问题。     

磁力泵滑动轴承磨损监测装置设计

针对磁力泵滑动轴承磨损发生后易造成隔离套磨穿事故的特点,设计了一种磁力泵滑动轴承磨损实时检测装置。简要介绍磁力泵滑动轴承磨损实时检测装置的工作原理,并对该检测装置零件设计进行了技术说明,最后对该装置实时监测的可行性进行了理论分析。分析表明该监测装置能够有效满足实时监测的设计要求,对提高磁力泵运行可靠性,减少工业事故的发生有着一定的实际意义。     

磁力泵推力滑动轴承失效分析及改进

对中石化安庆分公司丙烯腈装置磁力泵推力滑动轴承失效原因进行了分析,认为推力滑动轴承表面几何形状不合理导致难以形成流体动压润滑膜是失效的原因。将滑动摩擦表面改造成波浪形斜面,并通过数值模拟计算研究求出了最佳的斜面倾角。改造后的推力滑动轴承通过实际使用证明效果良好,延长了使用寿命。     

耐磨损径向滑动轴承结构设计及数值模拟研究

在磁力泵滑动轴承的实际设计过程中,应该综合考虑润滑、冷却、防止颗粒划伤等因素,同时兼顾泵的效率要求。基于轴瓦内侧开设导流槽、轴瓦分布圆孔的设计思路,设计了11种不同结构的磁力泵径向滑动轴承,并对其进行有限元计算,分析了不同结构径向滑动轴承的力学性能,初步总结了导流槽及轴瓦圆孔在自润滑轴承设计中的应用规律。     

衬塑磁力泵轴系相关结构的改进方法研究

磁力泵是一种利用磁性联轴器的磁力传动装置,实现扭矩无接触传递的一种无机械密封、无泄漏的工业用泵。金属磁力泵材料成本比较高,常用材料有304、316、316L、904、哈氏C等。衬塑磁力泵的出现正好解决性价比这一问题。衬塑磁力泵衬层材料是F46,此种材料耐酸碱性能优异,最大缺点是使用温度在80℃以下。     

磁力驱动泵设置监控系统分析

磁力泵是一种理想的满足环保要求的产品，尤其对于输送有毒、易燃、易爆的介质更是首选。磁力泵的可靠运行是设计和使用部门共同追求的目标，实施有效的监控是保证磁力泵可靠运行的必备条件。从电动机过载保护，轻载监控，抽空监控装置，滑动轴承磨损监控，过强振动监控，隔离套温升监控，冷却循环系统监控，止推盘轴向力监控八个方面提出监控的理由和方法，对磁力泵的选型和设计有一定的参考价值。     

多级双壳体磁力泵扬程降低原因分析及改进

在剧毒和易燃易爆高危介质工况,针对小流量高扬程的输送工况,在选型使用中往往采用多级双壳体磁力泵,而扬程的降低是多级双壳体磁力泵的最常见也是最难判断和解决的故障。总结了某公司多级双壳体磁力泵的使用和检修后扬程降低的原因分析和改造过程,通过单个叶轮压头损失、泵水力轨迹途中泄漏等几个环节有效测量和分析,排查出多级双壳体磁力泵扬程损失点,制定了一系列措施,并逐个提升材质耐腐蚀和耐磨性能,对检修安装过程进行优化改造,解决了由于介质腐蚀和冲刷引起的扬程降低的问题,在小流量高扬程的多级磁力泵、屏蔽泵、多级离心泵等的应用和检修方面有很好的借鉴推广意义。     

新型材质滑动轴承在磁力泵的应用

对96%醋酸装置开车过程中,脱水进料工位的磁力泵,在实际运行过程中存在滑动轴承易碎的问题进行了分析并采用新型材质对滑动轴承进行改造,经运转检验,改造效果良好。     

磁力泵冲洗润滑管路和延长滑动轴承寿命的措施

本文针对磁力泵的结构和冲洗润滑管路的特点，分析冲洗润滑管路对滑动轴承和内外磁钢的影响，并提出了相应的防范措施。     

短玻纤填充PTFE复合材料磨损性能研究

用机械共混、冷压成型和烧结的方法制备了不同质量分数(10％～40％)的短玻纤填充PTFE复合材料样品。用MM-200型磨损试验机评价了不同样品在于摩擦定载荷条件下的磨损性能；用扫描电子显微镜(SEM)对试样的磨损表面进行了观察分析。结果表明：在所采用的实验条件下，随短玻纤含量的增加，抗磨损性能先增大后减小，在含量为30％取得最佳抗磨损性能。     

Performance study based on inner flow field numerical simulation of magnetic drive pumps with different rotate speeds

Magnetic drive pump has gotten great achievement and has been widely used in some special fields.Currently,the researches on magnetic drive pump have focused on hydraulic design,bearing,axial force in China,and a new magnetic drive pump with low flow and high head have been developed overseas.However,low efficiency and large size are the common disadvantages for the magnetic drive pump.In order to study the performance of high-speed magnetic drive pump,FLUENT was used to simulate the inner flow field of magnetic drive pumps with different rotate speeds,and get velocity and pressure distributions of inner flow field.According to analysis the changes of velocity and pressure to ensure the stable operation of pump and avoid cavitation.Based on the analysis of velocity and pressure,this paper presents the pump efficiency of magnetic drive pumps with different rotated speeds by calculating the power loss in impeller and volute,hydraulic loss,volumetric loss,mechanical loss and discussing the different reasons of power loss between the magnetic drive pumps with different rotated speeds.In addition,the magnetic drive pumps were tested in a closed testing system.Pressure sensors were set in inlet and outlet of magnetic drive pumps to get the pressure and the head,while the pump efficiency could be got by calculating the power loss between the input power and the outlet power.The results of simulation and test were similar,which shows that the method of simulation is feasible.The proposed research provides the instruction to design high-speed magnetic drive pump.     

人工心脏泵磁悬浮转子非线性特性及控制方法研究

引入滑动模态变结构控制，对转子转速大于6000r／min时转子产生的颤振及转子在强干扰下产生的新的平衡位置等非线性效应进行控制。以轴向为例取切换函数，滑动模态按指数律趋向原点，推导出了等效控制方程。用电锤给轴向磁悬浮转子施加冲击干扰，观察变结构控制的结果，发现系统在短暂调整后即恢复平衡位置，渐近稳定，说明采用变结构控制的适应性较好。利用变结构控制对内部参数变动和外部扰动作用不变这一显著特点，可有利于控制血液应力及粘弹性等非线性因素造成的转子扰动，从而使得系统数学模型的不准确性、实际系统的不确定性及镇定的复杂性得以解决。     

A cost-effective extracorporeal magnetically-levitated centrifugal blood pump employing a disposable magnet-free impeller

In the field of rotary blood pumps, contactless support of the impeller by a magnetic bearing has been identified as a promising method to reduce blood damage and enhance durability. The authors developed a two-degrees-of-freedom radial controlled magnetic bearing system without a permanent magnet in the impeller in order that a low-cost disposable pump-head for an extracorporeal centrifugal blood pump could be manufactured more easily. Stable levitation and contactless rotation of the 'magnet-free' impeller were realized for a prototype blood-pump that made use of this magnetic bearing. The run-out of the impeller position at between 1000 r/min and 3000 r/min was less than 40 microm in the radial-controlled directions. The total power consumption of the magnetic bearing was less than 1 W at the same rotational speeds. When the pump was operated, a flow rate of 5 l/min against a head pressure of 78.66 kPa was achieved at a rotational speed of 4000 r/min, which is sufficient for extracorporeal circulation support. The proposed technology offers the advantage of low-cost mass production of disposable pump heads.     

基于永磁悬推力轴承的磁力泵轴向力平衡方法

针对磁力泵在运行过程中产生的轴向力平衡问题,通过对磁力泵轴向力的分析,提出了采用永磁悬浮推力轴承来替代普通推力轴承的方法,彻底解决了磁力泵工作现场推力轴承磨损与破裂的问题,实现了磁力泵无接触传动,降低了噪声和功率损失,提高了磁力泵的工作效率和使用寿命。     

核电站余热排出泵轴承体的受热分析

余热排出泵是核电站中核岛安全停堆的重要保障,而轴承体又是余热排出泵的安全稳定运行的关键部件。应用传热学理论,分析了轴承体的受热状态,结果表明余热排出泵内高温流体的热量通过泵轴传递到轴承体,再加上轴承的高速旋转摩擦产生的热量,使轴承体的温度过高,影响轴承体的安全稳定运行,须采用循环水进行冷却。根据传热学和能量守恒原理,分析了循环冷却水量与出口水温的关系,为循环水量的确定提供了参考。     

润滑油添加剂对聚合物及其复合材料摩擦磨损性能的影响

利用MHK-500型环-块磨损试验机研究了二烷基二硫代磷酸锌(ZDDP)对几种聚合物及其复合材料-金属摩擦副油润滑摩擦磨损性能的影响。结果表明,液体石蜡中的ZDDP对尼龙66(PA66)及聚酰亚胺(PI)-GCr15轴承钢摩擦副的摩擦系数影响不大,但却使聚四氟乙烯(PTEE)及其复合材料-GCr15轴承钢摩擦副的摩擦系数略有降低。PTEE及其复合材料-GCr15轴承钢摩擦副表面的ZDDP吸附膜具有一定的抗磨作用,它大幅度降低了Pb、PbO及MoS     

高速加工机床主轴支承系统的研究

介绍高速加工机床用电主轴的特性及应用现状，分析加工机床电主轴系统的理想结构、陶瓷球轴承、电磁浮轴承、液体动静压轴承的特性及其在高速主轴单元中的应用，并以高速数控随动曲轴磨床的主轴支承系统设计为例，说明如何选用设计合适的高速加工机床主轴支承系统。     

Rolling Contact Fatigue Evaluation of Advanced Bearing Steels with and Without the Oil Anti-Wear Additive Tricresyl Phosphate

The effect of the oil anti-wear additive tricresyl phosphate (TCP) on rolling contact fatigue (RCF) life of advanced bearing steels—AISI VIMVAR M50, CSS 42L, Pyrowear 675, and Cronidur 30 was investigated with silicon nitride balls at 177 °C and at a maximum Hertzian stress of 5.5 GPa. TCP at 1% additive concentration was blended into a synthetic polyol ester turbine engine lubricant basestock having a nominal viscosity of 3 cSt at 100 °C. Additionally, the basestock was fortified with the anti-oxidants dioctyl-diphenyl amine (DODPA) and phenyl-α-napthyl amine (PANA) at 1% concentration each. The presence of TCP has a measurable positive effect on RCF life and wear. Also, all the advanced bearing materials exhibited superior fatigue life compared to conventional bearing steel M50, both with and without TCP. The study indicates that current gas turbine lubricant formulations with TCP have positive effects on fatigue life and wear performance of M50, Pyrowear 675, CSS 42L, and Cronidur 30.     

整形方式对卷制滑动轴承精度特性的影响

针对高压齿轮泵用卷制滑动轴承的高精度要求,研究了三层复合材料卷制滑动轴承整形工艺技术,对比分析了3种整形方式及其整形效果,由分析可知:采用内撑外箍贯穿式整形不仅能够使三层复合材料卷制滑动轴承达到理想的几何精度,而且对于改善表面自润滑材料的附着性,提高卷制滑动轴承的综合使用性能也有良好的促进作用。