一种新型罗茨风机轴封的研制

本文介绍了一种新型罗茨风机的主轴组合密封，该密封在结构及设计思想上有一定的新颖性，对于各种工况的罗茨风机密封均有较好的推广使用价值，并已通过鉴定。     

罗茨风机动态特性数值分析

为改善罗茨风机动态特性,提高其运行的稳定性和安全性,针对某型罗茨风机进行了三维实体建模,采用商用计算软件ANSYS Work-bench对该罗茨风机整体结构进行了有限元数值分析,获得了罗茨风机转子系统和机体的模态特性及机体的谐响应特性,并分别给出了罗茨风机转子系统和机体的前6阶固有频率和固有振型以及机体的谐响应特性曲线。研究结果表明:罗茨风机振动变形量最大位置在支撑腿处,当激励频率为300～500Hz时,罗茨风机转子和机体的振动较大;当激励频率为400Hz时,振幅达到最大值。     

新型机械密封在输送沼气用罗茨鼓风机的应用

对目前国内输送沼气行业的前景进行了分析,并简单描述了普通罗茨风机的原理和密封结构,在此基础之上,对罗茨鼓风机进行结构设计和改进,最终设计出带有新型机械密封输送沼气用罗茨鼓风机,解决了危险介质沼气的密封问题,并改善了润滑油路,为罗茨风机在沼气及其他特殊介质的输送方面提供了一种可行的方案。     

罗茨风机噪声源识别与控制综述

本文针对罗茨风机噪声污染问题，系统分析了罗茨风机噪声源的特性及其产生机理，概述了罗茨风机噪声的控制方法与基本措施，阐述了低噪声罗茨风机的研究发展方向。     

影响罗茨风机性能的参数研究

针对罗茨风机在工业应用中噪声大且安全系数低的问题,在分析罗茨风机渐开线形状以及机壳形状设计原则的基础上,提出对应的改进罗茨风机性能的思路,并通过数值模拟分析的方式对渐开线型线及机壳形状影响罗茨风机性能的机理进行研究,得出提升罗茨风机性能的具体措施,为扩大罗茨风机应用范围奠定基础。     

德国艾珍机械(Aerzen)正式推出新一代节能型扭叶转子风机Delta Hybrid

德国艾珍新一代节能型扭叶转子风机Delta Hybrid,在苛刻环境中成功试运行3年,目前正式投入中国市场,并于2011年8月25日在上海成功举办了"德国Aerzen新一代节能型扭叶转子风机Delta Hybrid产品研讨会"。Delta Hybrid借助了艾珍在罗茨风机和螺杆压缩机分别143年和68年的制造经验,并成功结合二者的技术优势。     

罗茨风机的降噪措施

针对罗茨风机的强噪声问题,介绍了几种控制噪声的方法,以及折板式阻性消音器用于罗茨风机的良好效果.     

罗茨风机故障的原因分析和处理

针对化工装置罗茨风机频繁故障的问题进行了原因分析,发现检修时轴承锥形套未更换、止推轴承游隙不达标以及风机转速超标是造成风机故障的重要原因,采取减小电机皮带轮尺寸,配套更换轴承锥形套以及调整止推轴承游隙的措施后,罗茨风机运行状态良好,振动大幅下降,本文对处理罗茨风机类似问题有一定的借鉴意义。     

煤气输送用罗茨风机常见故障检修与维护

对LGA型罗茨风机的几种常见故障及检修维护方法进行了分析,提出具体的修理维护办法,对罗茨风机的日常运行管理、维护检修工作有参考价值。     

推介企业

山东省章丘鼓风机股份有限公司 山东省章丘鼓风机股份有限公司是专业生产罗茨鼓风机的大型企业,具有四十多年的罗茨鼓风机设计、制造技术和经验。     

Modification design method for an enveloping hourglass worm gear with consideration of machining and misalignment errors

The influences of machining and misalignment errors play a very critical role in the performance of the anti-backlash double-roller enveloping hourglass worm gear(ADEHWG).However,a corresponding efficient method for eliminating or reducing these errors on the tooth profile of the ADEHWG is seldom reported.The gear engagement equation and tooth profile equation for considering six different errors that could arise from the machining and gear misalignment are derived from the theories of differential geometry and gear meshing.Also,the tooth contact analysis(TCA) is used to systematically investigate the influence of the machining and misalignment errors on the contact curves and the tooth profile by means of numerical analysis and three-dimensional solid modeling.The research results show that vertical angular misalignment of the worm wheel(Δβ) has the strongest influences while the tooth angle error(Δα) has the weakest influences on the contact curves and the tooth profile.A novel efficient approach is proposed and used to minimize the effect of the errors in manufacturing by changing the radius of the grinding wheel and the approaching point of contact.The results from the TCA and the experiment demonstrate that this tooth profile design modification method can indeed reduce the machining and misalignment errors.This modification design method is helpful in understanding the manufacturing technology of the ADEHWG.     

凸轮激波复式活齿传动的结构及齿形分析

提出一种新颖的大速比传动装置——凸轮激波复式滚动活齿传动装置，该传动装置由一级NGW型行星传动机构与一级凸轮激波的二齿差滚动活齿传动机构串联组成。对其传动原理、传动比及传动特性进行了分析，以此为基础设计了装置的传动结构。导出了中心内齿轮的齿形方程，给出了齿形计算示例，并进一步分析了相关参数对齿形几何性质的影响。     

Parametric analysis of the end face engagement worm gear

A novel specific type of worm drive, so-called end face engagement worm gear(EFEWD), is originally presented to minimize or overcome the gear backlash. Different factors, including the three different types, contact curves, tooth profile, lubrication angle and the induced normal curvature are taken into account to investigate the meshing characteristics and create the profile of a novel specific type of worm drive through mathematical models and theoretical analysis. The tooth of the worm wheel is very specific with the sine-shaped tooth which is located at the alveolus of the worm and the tooth profile of a worm is generated by the meshing movement of the worm wheel with the sine-shaped tooth, but just the end face of the worm(with three different typical meshing types) is adapted to meshing, and therefore an extraordinary manufacturing methods is used to generate the profile of the end face engagement worm. The research results indicates that the bearing contacts of the generated conjugate hourglass worm gear set are in line contacts, with certain advantages of no-backlash, high precision and high operating efficiency over other gears and gear systems besides the end face engagement worm gear drive may improve bearing contact, reduce the level of transmission errors and lessen the sensitivity to errors of alignment. Also, the end face engagement worm can be easily made with superior meshing and lubrication performance compared with the conventional techniques. In particular, the meshing and lubrication performance of the end face engagement worm gear by using the end face to meshing can be increased over 10% and 7%, respectively. This investigate is expect to provide a new insight on the design of the future no-backlash worm drive for industry.     

Mathematical model and manufacture programming of loxodromic-type normal circular-arc spiral bevel gear

In this paper, loxodromic-type normal circular-arc spiral bevel gear is proposed as a novel application of the circular-arc tooth profile at the gear transmission with intersecting axes. Based on the principle of molding-surface conjugation, the study develops a mathematical model for the tooth alignment curve and the computational flow at the design stage to enable the generation of the tooth surface. Machining of the tooth surface is then carried out to determine the interference-free tool path of the numerical control (NC). Moreover, a pair of loxodromic-type normal circular-arc spiral bevel gears is manufactured on computer numerical control (CNC) machine tools. The proposed theory and method are experimentally investigated, and the obtained results primarily reflect the superior performance of the proposed novel gear.     

数控齿轮加工机床的在机测量系统

基于齿轮渐开线轮廓面的构型机理和数控齿轮加工机床的运动功能,提出了一种齿轮在机测量方法,并开发了相应的在机测量系统。该方法在不增加额外的测量系统机械机构的情况下,充分利用数控机床自身的高速、高精密和高可靠性的伺服运动实现渐开线齿轮的齿形、齿向及齿距等误差项目的在机测量。在机测量实验表明了该系统的有效性和可行性,是齿轮在机测量中高效率、高精度、低成本的解决方案,构成了数控机床质量保证系统中的一个重要环节。     

双摆线钢球减速器齿廓曲线参数的选择

以双摆线钢球减速器设计中的核心部分--摆线槽齿廓曲线的参数方程为主线,对这一新型减速器齿廓曲线的主要设计参数进行了分析,得出了各参数在这种减速器设计中的选择原则.     

外啮合齿轮马达齿廓测试方法研究

外啮合齿轮马达工作时产生的压力流量脉动是马达工作噪声的主要来源，而研究马达降噪的一个方法是利用齿轮马达模型分析优化齿廓曲线与齿轮啮合容积的动态关系。目前研究中的模型一般采用标准的渐开线或摆线进行仿真，而未体现齿廓曲线由于变位和加工误差对齿轮啮合容积的动态特性的影响。提出一种采用激光位移传感器对外啮合齿轮马达齿廓进行非接触测量的方法，搭建了齿形测试装置并采用MATLAB/C语言建立实际齿廓曲线，从而得到轮齿的齿形信息。试验结果对比了实际与理论马达齿轮齿廓，实现了齿廓测量，并提出改进齿轮马达非接触测量精度的方法。     

采用包络法计算刀具刃口齿形

为了提高刀具的齿形精度,采用包络法计算刀具刃口齿形。根据二次包络环面蜗杆成型原理,提出了用包络法建立蜗轮齿面数学模型的方法,推导了蜗轮在中间平面齿形方程,即刀具刃口齿形方程,并利用MATLAB软件绘制出刀具刃口齿形。基于逆向工程的思想,用Pro/E软件建立了蜗杆三维模型。结果表明:蜗杆齿槽在轴向截面齿形与包络法计算得到的刀具刃口齿形一致。     

Dynamic interaction between contact loads and tooth wear of engaged plastic gear pairs

This study investigates the interaction between the dynamic contact load and the tooth profile wear of POM and Nylon 66 plastic gear pairs. A dynamic model of a plastic gear pair is presented. This model incorporates the effects of position-varying tooth mesh stiffness, damping ratio, load sharing, tooth profile wear and temperature on the dynamic contact load. The tooth wear equation developed by Flodin and Andersson [Simulation of mild wear in spur gears. Wear 1997;207:16–23] is utilized to simulate tooth wear and tooth profile variation. The variation of the contact load generated by the cumulative tooth profile wear is simulated and examined. A computational algorithm is developed to simulate the interaction between a dynamic contact load and tooth profile wear. Numerical results demonstrate that the dynamic load histogram of an engaged plastic gear pair can change markedly due to tooth wear.     

圆弧齿廓谐波齿轮传动齿形设计中的几个问题

谐波齿轮传动采用圆弧齿廓后,可以改善柔轮齿根的应力状况和传动的啮合质量,提高承载能力和扭转刚度。本文首先计算出柔轮采用圆弧齿廓时,刚轮与之共轭的理论齿廓,通过用拟合圆弧对其进行逼近,得到拟合误差的变化规律;最后指出在开发双圆弧齿廓谐波齿轮传动时,应首先合理确定波发生器形式和柔轮径向变形量系数。