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概述 
3300 XL 25 mm 传感器系统由独立的25 mm 探头、延伸电缆和3300 XL 25 mm 前置器组成。0.787 V/mm(20 mV/mil)的输出使系统的线性范围达12.7 mm(500 mil)。由于具有这样的线性范围，3300 XL 25 mm 传感器系统适用于测量中到大型蒸汽透平发电机上由于透平转子和机器定子（壳体）膨胀率不同所引起的差胀（DE）。


胀差测量 
胀差测量由两个电涡流传感器实现，测量与推力轴承有一定距离的凸缘或斜面。典型的传感器安装方式包括： 
两个传感器测量凸缘的同一侧。
两个补偿式输入传感器分别测量凸缘的相对一侧，有效地使可测量的DE 范围加倍。
两个传感器中至少有一个传感器测量转子的一个斜面，另一个传感器测量一个独立斜面或转子上的不同位置，以补偿径向移动。这种安装方式会对测量引入某些误差，但是能够测量比补偿式测量更长的总DE 距离。
安装方式需要根据可用的靶面尺寸、预计的转子轴向位移量以及机器内部（凸缘相对于斜面）的DE 靶面类型。当可用的凸缘高度足够时，应采用两个传感器测量凸缘的同一侧这种安装方式。两个传感器将提供互为冗余的测量。


系统兼容性 
3300 XL 25mm 探头具有多种壳体配置形式，可以代替所有标准的7200 25mm、7200 35mm 和25mm DE 传感器系统（包括侧面和尾部引出探头）。前置器的输出也与7200和25mm DE 系统的输出相同，使用户在升级时不需要修改任何监测器组态。当升级以前的系统时，传感器系统的每个组件（探头、延伸电缆和前置器）必须全部替换成 3300 XL 25mm 的组件。


趋近式探头和延伸电缆 
3300 XL 25 mm 探头设计用于苛刻的蒸汽透平DE 环境。它能在高达200°C（392°F）的温度下持续运行并保持精度，还可以承受250°C（482°F）的间歇高温。25 mm 探头前后密封，并使用FluidLoc电缆（所有标准25mm 探头），防止湿气进入探头端部。特殊的高温ClickLoc接头也是探头和延伸电缆的标准配置。每个探头和电缆都带有接头保护器和一次性接头保护器安装工具，确保接头不受污染。探头头部上的ClickLoc接头具有可拆卸的衬套，帮助在紧密间隙内缠绕电缆。 
3300 XL 25mm 探头有多种探头壳体形式，包括11/4-12 或11/2-12 英制螺纹、M30×2 或M39×1.5 公制螺纹或侧面或尾部引出探头带有1.06 或1.50 英寸直径无螺纹探头壳体。此外，有螺纹的3300 XL 25mm 探头壳体在标准供货中提供带有预钻安全线孔的锁紧螺母。 


前置器 
3300 XL 25mm 前置器1 与我们以前的3300 XL 前置器具有同样性。其紧凑的结构
既可采用高密度DIN 导轨安装形式，也可采用更传统的面板安装形式。改进的RFI/EMI抗干扰性使3300 XL 前置器不需要任何特殊的安装考虑即可达到欧洲电磁兼容性许可。RFI 抗干扰性还可以防止传感器系统受到周围高频无线电信号的干扰。前置器上SpringLoc端子带不需要特殊的安装工具，使现场连线更迅速、更坚固。
注： 
1.  前置器从工厂供货时已经过AISI4140钢校准。也可以按用户的要求对其它靶面材料进行校准。


安装附件 
在安装过程中以及安装后必须定期对传感器系统的正确运行进行校验，校验方法是移动传感器系统以模拟凸缘的运动。这种方法需要通过安装支架使传感器系统相对于轴转子和凸缘滑动。
对于单个传感器和补偿式输入的25 mm 差胀传感器应用，可订购可选的3300 XL 滑动支架。该支架可使传感器系统的校验更容易，并能够调整探头间隙，使传感器系统在线性范围内滑动。滑动支架的底板安装在差胀凸缘附近的透平壳体内表面上。探头安装
在附着于滑板上的探头座上。滑板在底板上滑动，并通过螺栓和安全导线固定在底板上。在校验和安装传感器时，松开将滑板固定在底板上的绑带，移动滑板和探头。千分表校验组件通过测量滑板的运动为校验提供参考。3300 XL 滑动支架帮助确保传感器系统与转子对中并垂直。


技术规格 
在没有另外注明时，以下关于3300 XL 25 mm前置器、延伸电缆和探头的技术规格是在下
列条件下得到的：温度0°C～+45°C（+32°F～+113°F），－24Vdc 电源供电，10KΩ负载，直径不小于61 mm (2.4 in)的AISI4140 钢被测靶面，探头间隙为7.0mm (275 mils)。其精度和可互换性指标不适用于未经本特利内华达AISI 4140 钢靶面校准的传感器系统。​

本特利传感器探头330851-02-000-050-10-01-CN，美国BENTLY探头，本特利电涡流传感器探头；本特利胀差测量探头；​

本特利Bently探头，3300XL 25mm 电涡流探头
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本特利BENTLY电涡流传感器系统附件
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27474-01 石碳螺纹探头安装支架
27474-04  石碳螺纹探头安装支架
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本特利BENTLY速度-位移转换器
9513-02
46687-01
本特利Bently高温两线传感器，速度传感器
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​鼓风机主要由下列六部分组成：电机、空气过滤器、鼓风机本体、空气室、底座（兼油箱）、滴油嘴。鼓风机靠汽缸内偏置的转子偏心运转，并使转子槽中的叶片之间的容积变化将空气吸入、压缩、吐出。在运转中利用鼓风机的压力差自动将润滑送到滴油嘴，滴入汽缸内以减少摩擦及噪声，同时可保持汽缸内气体不回流，此类鼓风机又称为滑片式鼓风机。


鼓风机的结构组成
靠转动叶轮上叶片的动力作用将能量传递给连续流动的流体或靠流体传出的能量推动叶片旋转的装置，称为叶轮机械。在叶轮机械中，转动叶片对流体做正功或负功，使流体的压力升高或降低。叶轮机械分为两大类：一类是工作机，流体从其中吸收功率增加压头或水头，如叶片式泵和通风机；另一类是原动机，流体在其中膨胀、降低压力或水头产生功率，如汽轮机和水轮机。人们把原动机称为透平，而把工作机成为叶片式流体机械。


目前的高炉鼓风机均采用叶片式风机，主要有离心式和轴流式两大类。离心鼓风机具有结构简单，运行可靠，设计点效率高，噪声较小等优点。离心式高炉鼓风机在中国有比较成熟的制造和使用经验，400m3以下的高炉在工业落后的地区和国家使用较为广泛。但随着高炉的增大，离心鼓风机的调节损失、外形尺寸及风机重量等都有较大幅度的增加，这就给制造、运输、安装和维护等带来很大的困难，而且同时还受到旋转件——叶轮材料强 度、主轴刚度、电机启动等因素的限制，又使该风机运行的可靠性和经济性有所降低。而轴流式鼓风机具有结构紧凑、体积小、重量轻、负荷调节性好、使用范围宽、风机转动惯量小、电机易启动等特点，所以在大型化和现代化高炉上被广泛使用。中国在500m3以上的高炉中广泛采用了轴流鼓风机, 在制造和运行方面也积累了一定的经验。


单极高速离心鼓风机在设计上采用了三元流动设计理论，使单极离心式鼓风机效率高达82%以上，远优于多极离心鼓风机，在结构上采用了轴向进气导叶调节装置，在恒定压力下，流量调节为额定电流的 65%~105%，单台流量调节范围45%-100%，使得在低负荷条件下运行也有较高的效率，这是低速多极鼓风机和罗茨鼓风机所没有的优点。由于单极高速离心鼓风机具有体积小、重量轻、效率高、节约能源、性能范围调节广泛和自动化水平高等特点，目前已是污水处理行业曝气鼓风机的主流产品。


单级高速离心风机的工作原理是：原动机通过轴驱动叶轮高速旋转，气流由进口轴向进入高速旋转的叶轮后变成径向流动被加速，然后进入扩压腔，改变流动方向而减速，这种减速作用将高速旋转的气流中具有的动能转化为压能（势能），使风机出口保持稳定压力。


离心鼓风机又称透平鼓风机，气体在旋转的叶轮作用下，获得压力和流速的增大，可以实现连续送风。其工作原理为当电机转动从而带动风机叶轮旋转，气体在离心力的作用下甩出并改变流向，动能转换为静压能，从排气口排出气体，同时在叶轮间形成一定负压，使外界气体在大气压的作用下补入，达到连续鼓风的目的。离心鼓风机根据叶轮数量分为多级离心鼓风机和单级离心鼓风机。多级低速离心鼓风机正常是指转子在2只或2只以上的叶轮串联在同一根主轴上，至多可有八级风叶，转子转速为3000~3600r/min的离心式鼓风机闹。离心鼓风机一般选用进口节流调节流量与压力，使风机在较低的功率下运行，不需要放风调节，且能保持同额定工况基本相同的高效率，用于压力流量都不稳定的工况。


离心式鼓风机的工作原理与离心式通风机相似，只是空气的压缩过程通常是经过几个工作叶轮（或称几级）在离心力的作用下进行的。鼓风机有一个高速转动的转子，转子上的叶片带动空气高速运动，离心力使空气在渐开线形状的机壳内，沿着渐开线流向风机出口，高速的气流具有一定的风压。新空气由机壳的中心进入补充。


空气悬浮离心鼓风机是一种全新概念的离心鼓风机，借鉴航空、航天器的涡轮发动机，应用空气悬浮技术，采用了“高速直联电机”和“空气悬浮轴承"这两个核心技术，改善了传统单级高速涡轮鼓风机的转速齿轮联轴器、冷却系统和油润滑系统等，大大提高了产品的技术性能及运行可靠性。




齿轮箱应用范围广泛，例如在风力发电机组中的应用，齿轮箱是在风力发电机组中应用很广泛的一个重要的机械部件。其主要功用是将风轮在风力作用下所产生的动力传递给发电机并使其得到相应的转速。
通常风轮的转速很低，远达不到发电机发电所要求的转速，必须通过齿轮箱齿轮副的增速作用来实现，故也将齿轮箱称之为增速箱。


齿轮箱承受来自风轮的作用力和齿轮传动时产生的反力，必须具有足够的刚性去承受力和力矩的作用，防止变形，保证传动质量。齿轮箱箱体的设计应按照风电机组动力传动的布局安排、加工和装配条件、便于检查和维护等要求来进行。随着齿轮箱行业的不断飞速发展，越来越多的行业和不同的企业都运用到了齿轮箱，也有越来越多的企业在齿轮箱行业内发展壮大。


齿轮箱有如下的作用：
1、加速减速,就是常说的变速齿轮箱。
2、改变传动方向，例如我们用两个扇形齿轮可以将力垂直传递到另一个转动轴。
3、改变转动力矩。同等功率条件下，速度转的越快的齿轮,轴所受的力矩越小，反之越大。
4、离合功能：我们可以通过分开两个原本啮合的齿轮,达到把发动机与负载分开的目的。比如刹车离合器等。
5、分配动力。例如我们可以用一台发动机，通过齿轮箱主轴带动多个从轴，从而实现一台发动机带动多个负载的功能。

电涡流传感器在大型旋转机械中的应用
电涡流传感器系统广泛应用于电力、石油、化工、冶金等行业和一些科研单位。对汽轮机、水轮机、鼓风机、压缩机、空分机、齿轮箱、大型冷却泵等大型旋转机械轴的径向振动、轴向位移、键相器、轴转速、胀差、偏心、以及转子动力学研究和零件尺寸检验等进行在线测量和保护。

电涡流传感器能静态和动态地非接触、高线性度、高分辨力地测量被测金属导体距探头表面的距离。它是一种非接触的线性化计量工具。电涡流传感器能准确测量被测体（必须是金属导体）与探头端面之间静态和动态的相对位移变化。电涡流传感器的原理是，通过电涡流效应的原理，准确测量被测体(必须是金属导体)与探头端面的相对位置，其特点是长期工作可靠性好、灵敏度高、抗干扰能力强、非接触测量、响应速度快、不受油水等介质的影响，常被用于对大型旋转机械的轴位移、轴振动、轴转速等参数进行长期实时监测，可以分析出设备的工作状况和故障原因，有效地对设备进行保护及预维修。


传感器经常作为自动化产品的一部分，在我们日常生产生活中扮演着重要角色。它是现代科技的前沿技术，其水平高低也是衡量一个国家科技发展水平的重要标志之一。市面上的传感器多种多样，玲琅满目，可供我们选择的有很多。电感涡流传感器等众多高性能传感器，被大量应用在各行各业。特别是机床行业，以及汽车制造等行业更是应用广泛，是国内外公认的具有发展前途的高技术产业。


在高速旋转机械和往复式运动机械的状态分析，振动研究、分析测量中，对非接触的高精度振动、位移信号，能连续准确地采集到转子振动状态的多种参数。如轴的径向振动、振幅以及轴向位置。从转子动力学、轴承学的理论上分析，大型旋转机械的运动状态，主要取决于其核心—转轴，而电涡流传感器，能直接非接触测量转轴的状态，对诸如转子的不平衡、不对中、轴承磨损、轴裂纹及发生摩擦等机械问题的早期判定，可提供关键的信息。电涡流传感器以其长期工作可靠性好、测量范围宽、灵敏度高、分辨率高、响应速度快、抗干扰力强、不受油污等介质的影响、结构简单等优点，在大型旋转机械状态的在线监测与故障诊断中得到广泛应用 。