资源目录
压缩包内文档预览：
编号：30435230
类型：共享资源
大小：1.72MB
格式：ZIP
上传时间：2019-12-12
上传人：好资料QQ****51605
认证信息
个人认证
孙**（实名认证）
江苏
IP属地：江苏
12
积分
- 关 键 词：
-
中英文文献译文
外文
翻译
螺杆
压缩机
中英文
文献
译文
- 资源描述：
-
外文翻译--螺杆压缩机【中英文文献译文】,中英文文献译文,外文,翻译,螺杆,压缩机,中英文,文献,译文
- 内容简介：
-
中文译文螺杆压缩机螺杆压缩机的几何形状对称分布有一个巨大的吹孔面积不包括它任何压缩机应用在高或中等压力比参与。然而，对称分布的表现出奇的好在低高压压缩机中的应用。对圆形的轮廓，更多的细节可以发现马德克，1978。2.4.8 SRM的“A”型SRM”“曲线如图2.11所示。它保留了所有的有利的特征的对称外形像它的简单性的同时避免其主要的缺点，即，大吹孔面积。减少的主要目标气孔面积允许主门的尖点了转子产生他们的同行，在栅极和主转子摆线分别同行，剖面主要由界的门转子和一条线穿过门转子轴。主曲线的设置包括:D2C2,这是一个圆形的门转子与中心门口节圆,C2B2,这是一个圆在大门口转子,该中心位于外的节圆区域。这是一个新的功能实施的一些问题在一代的主旋翼同行,因为数学用于配置生成。当时通用传动装置不足。这偏心保证压力角的转子球不同于零,导致它的易于制造。 段是一个圆形的英航转子以其中心门在节圆。 扁平的叶边的主要和门出现生成EPI /圆内旋轮线，分别由G和H的门主转子组成。 是一个径向线GF2门口的转子。 这带来了同样的制造业的好处前面提到的圆偏心在最受欢迎的转子型线的评论2.4。图2.11 “A”型发动机31对面的叶侧。F2E2是一个圆的中心在大门口音高和最后,E2D2是一个圆的中心在门轴。 有关“A”简介的更多详细信息由 Amosov et al. 所出版的， 1977 年和作者： Rinder， 1979。 “一个”配置文件是一个很好的例子,一个好的和简单的想法如何进成一个复杂的结果。 因此,“一个”剖面是不断遭受 这导致变化的“C”剖面。这主要是生成改善剖面可制造性。 最后,一个完全新的配置文件“D”剖面生成了一个新的发展介绍在剖面传动装置 和增加门转子扭矩。尽管复杂，其最终形式的复杂性的“一个”剖面出现的最受欢迎的螺杆压缩机剖面,特别是在其专利过期。2.4.9 SRM的“D”简介SRM的“D”文件，如图2.12所示，是专门由界产生随着离转子节圆的中心。类似的演示类偏心圆的半径为R3的内圈。B1C1为偏心圆的半径为R1，其中，连同a1j1小圆弧的半径R2，位于主转子。g2h2在栅极转子和E2F2小圆弧栅上的圆弧转子。f2g2是产生的门转子相对大的圆弧在主旋翼的可能的最小曲率对应的曲线。两个圆弧，b2c2和f2g2确保在大曲率半径节圆的面积。这避免了高应力在转子接触区。图2.12 开关磁阻电机的“D”简介32 2螺杆压缩机的几何形状2.4.10 SRM的“G”简介。“G”配置文件介绍了SRM在上世纪十九年代作为一个对于“D”更换转子，如图2.13所示。相比“D”，“G”转子，转子具有两个额外的界的独特的特征在主转子叶顶区域，靠近分度圆。此功能提高了转子的接触和，此外，产生较短的密封线。这在图2.13中可以看到，其中一个转子的“G”简介通过分段h1i1仅在其扁平面特性。图2.13 开关磁阻电机的“G”简介2.4.11市“N”产生的转子型线架“N”转子由一架生成程序计算。这个区别来自另外的他们。在这种情况下，大吹孔面积，这是一个特征架产生的转子，所产生的高压力克服通过转子共轭程序是一侧的机架。这削弱了单一的适当的曲线的架子上。那么这样一架用于分析两个主要的门转子。该方法及其扩展应用由作者创造了许多不同的转子型线，他们中的一些应用通过斯托西奇等人，1986，和Hanjalic斯托西奇，1994。一个应用程序齿条的生成过程的描述斯托西奇，1996。以下内容是被生成的一个架子的简洁的描述“N”使腐坏者简介，典型使腐坏者的一个家庭中为空气的有效压缩设计描，共同 refrigerants 和一些过程气体。使腐坏者被生成按联合架子-rotor 的一代程序其特征是，以便为表现尽可能优化任何细节可能欣然地进一步被修改申请。33架子上所有主要的弧坐标在此相对在机架上的坐标系统。机架的叶分为几个弧。轮廓圆弧之间的分歧被表示为大写字母和每个弧分别定义，如图所示。2.14和2.15在那里架和转子所示。图2.14 生成的“N”型架图2.15 “N”转子的主曲线给出架34 2螺杆压缩机的几何形状所有的曲线给出了一个“弧”表述为：axp + byq = 1。因此，直线，圆，一组抛物线，椭圆和双曲线都容易描述通过选择一个适当的值的参数，B，P和Q。段的机架上的直线，EF是圆弧半径R，段FG是上渐开线直线，P = Q = 1，同时段生长激素对齿条啮合曲线生成的圆弧g2h2上内圈。段HJ齿条啮合曲线所产生的在主转子半径的圆弧h1j1。段JA是一个循环圆弧半径R上的齿条，AB是一个圆弧，可以是圆形或双曲线或抛物线，椭圆，段BC在齿条直线匹配的转子轮叶和CD的渐开线的圆弧架，半径为R3。“N”简介的更多详细信息可以被找到在 Stosic， 1994 年。2.4.12特色的“N”型示例的“N”在2-3，3-5，4-5，4-6，5-6形，5-7和6-7配置在图中给出。2.16图2.23。应该指出的是自动获得从一个计算机代码被所有的转子考虑简单地指定在主门转子叶数，和在一般型的叶曲线。各种改性分布是可能的。“N”型设计是一种妥协之间的完全密封，小吹孔面积，大位移，短。图2.16 “N”在2-3配置的转子图2.17 “N”在3-5配置的转子图2.18 “N”在4-5配置的转子图2.19 “N”在4-6配置的转子图2.20 “N”转子相对于“西格玛”，“D”和“开关磁阻电机转子旋风”图2.21 “N”在5-6配置的转子图2.22 “N”在5-7配置的转子图2.23 “N”在6 / 7配置的转子密封线,小关卷,渐开线转子接触和适当的门转子扭矩分配连同高转子机械刚度。叶的数量需要随指定的压缩机责任。 3/5安排最适合干空气压缩,4/5和5/6的石油淹没了压缩机和温和的压力差和6/7为高压和大内置体积比制冷应用程序。虽然一个转子型线的全面的评估需要不止一个几何评估，一些对“N”型可能是关键的功能通过与三个最流行的螺钉比较容易理解转子型线已经描述在这里，（一）“西格玛”轮廓的bammert，1979，（b）SRM的“D”轮廓的astberg 1982，和（c）“旋风”简介通过Hough变换和莫里斯，1984。所有这些转子如图2.20所示的地方可以看出，“N”的公司有一个更大的吞吐量和更严厉的门转子在所有情况下，当如吹孔面积等特点，有限体积和高压密封线的长度是相同。同时，低压密封线较短，但这不重要因为相应的间隙可以保持很小。吹孔面积可由尖端半径的调整控制无论是主要和门的门转子外径小于或等于中径。同时密封线可以保持很通过构建大部分从圆的中心转子型线短靠近分度圆。但是，在吹孔面积的减少将增加在平坦的转子侧的密封线长度。之间的一种折衷这些趋势，因此需要获得最好的结果。转子失稳往往是由在门转子扭矩分布引起的在一个完整的周期变化的方向。配置文件生成程序本文介绍了能够控制大门上的扭矩转子，从而避免这样的影响。此外，全齿之间的接触“N”转子使任何额外的接触载荷更容易被吸收比任何其他类型的转子。两个转子对图2.24所示第一个具有所谓的“负”的门转子扭矩的同时第二显示更常见的“积极”的扭矩。图2.24 “N”负转矩，左、右正扭矩，2.4.13鼓风机转子型线风机配置文件，如图2.25所示是对称的。因此，只有一个季度需要指定以定义整个转子。它由两段，在转子叶尖端和直的一个很小的圈子线。圆线的幻灯片和生成，而直线生成渐开线。图2.25 风机简介英文原文Screw CompressorThe Symmetric profile has a huge blow-hole area which excludes it from any compressor applicat -ion where a high or even moderate pressure ratio is involved. However, the symmetric profile per -forms surprisingly well in low pressure compressor applications.More details about the circular p -rofile can be found in Margolis, 1978.2.4.8 SRM “A” ProfileThe SRM “A” profile is shown in Fig. 2.11. It retains all the favourable features of the symmetric profile like its simplicity while avoiding its main disadvantage,namely, the large blow-hole area. The main goal of reducing the blow hole area was achieved by allowing the tip points of the main and gate rotors to generate their counterparts, trochoids on the gate and main rotor respectively. T -he “A” profile consists mainly of circles on the gate rotor and one line which passes through the gate rotor axis.The set of primary curves consists of: D2C2, which is a circle on the gate rotor with the centre on the gate pitch circle, and C2B2, which is a circle on the gate rotor, the centre of whi ch lies outside the pitch circle region.This was a new feature which imposed some problems in the generation of its main rotor counterpart, because the mathematics used for profile generation at tha -t time was insufficient for general gearing. This eccentricity ensured that the pressure angles on th -e rotor pitches differ from zero, resulting in its ease of manufacture. Segment BA is a circle on th -e gate rotor with its centre on the pitch circle. The flat lobe sides on the main and gate rotors weregenerated as epi/hypocycloids by points G on the gate and H on the main rotor respectively. GF2 is a radial line at the gate rotor. This brought the same benefits to manufacturing as the previously mentioned circle eccentricity onFig. 2.11 SRM “A” Profile2.4 Review of Most Popular Rotor Profiles 31 the opposite lobe side. F2E2 is a circle with the cent -re on the gate pitch and finally, E2D2 is a circle with the centre on the gate axis.More details on t -he “A” profile are published by Amosov et al., 1977 and by Rinder, 1979.The “A” profile is a go od example of how a good and simple idea evolved into a complicated result. Thus the “A” pro file was continuously subjected to changes which resulted in the “C” profile. This was mainly gen erated to improve the profile manufacturability. Finally, a completely new profile, the“D” profile was generated to introduce a new development in profile gearing and to increase the gate rotor tor -que.Despite the complexity of its final form the “A” profile emerged to be the most popular scre -w compressor profile, especially after its patent expired.2.4.9 SRM “D” ProfileThe SRM “D” profile, shown in Fig. 2.12, is generated exclusively by circles with the centres off the rotor pitch circles.Similar to the Demonstrator, C2D2 is an eccentric circle of radius r3 onthe gate rotor. B1C1 is an eccentric circle of radius r1, which, together withthe small circular arc A1J1 of radius r2, is positioned on the main rotor. G2H2is a small circular arc on the gate rotor and E2F2 is a circular arc on the gaterotor. F2G2 is a relatively large circular arc on the gate rotor which produces a corresponding curve of the smallest possible curvature on the main rotor.Both circular arc, B2C2 and F2G2 ensure a large radius of curvature in the pitch circle area. This avoids high stresses in the rotor contact region.Fig. 2.12 SRM “D” ProfileThe “G” profile was introduced by SRM in the late nineteen nineties as a replacement for the “D” rotor and is shown in Fig. 2.13. Compared with the“D” rotor, the “G” rotor has the unique feature of two additional circles in the addendum area on both lobes of the main rotor, close to the pitch circle.This feature improves the rotor contact and, additionally, generates shorter sealing lines. This can be seen in Fig. 2.13, where a rotor featuring “G” profile characteristics only on its flat side through segment H1I1 is presented.Fig. 2.13 SRM “G” Profile2.4.11 City “N” Rack Generated Rotor Profile “N” rotors are calculated by a rack generation procedure. This distinguishes them from any others. In this case, the large blow-hole area, which is a characteristic of rack generated rotors, is overcome by generating the high pressure side of the rack by means of a rotor conjugate procedure. This undercuts the single appropriate curve on the rack. Such a rack is then used for profiling both the main and the gate rotors. The method and its extensions were used by the authors to create a number of different rotor profiles, some of them used by Stosic et al., 1986, and Hanjalic and Stosic, 1994. One of the applications of the rack generation procedure is described in Stosic, 1996.The following is a brief description of a rack generated “N” rotor profile,typical of a family of rotor profiles designed for the efficient compression of air,common refrigerants and a number of process gases. The rotors are generated by the combined rack-rotor generation procedure whose features are such that it may be readily modified further to optimize performance for any specific application.2.4 Review of Most Popular Rotor Profiles 33The coordinates of all primary arcs on the rack are summarized here relative to the rack coordinate system. The lobe of the rack is divided into several arcs. The divisions between the profile arcs are denoted by capital letters and each arc is defined separately, as shown in the Figs. 2.14 and 2.15 where the rack and the rotors are shown.Fig. 2.14 Rack generated “N” ProfileFig. 2.15 “N” rotor primary curves given on rack34 2 Screw Compressor Geometry All curves are given as a “general arc” expressed as: axp + byq = 1. Thus straight lines, circles, parabolae, ellipses and hyperbolae are all easily described by selecting appropriate values for parameters a, b, p and q.Segment DE is a straight line on the rack, EF is a circular arc of radius r4,segment FG is a straight line for the upper involute, p = q = 1, while segment GH on the rack is a meshing curve generated by the circular arc G2H2 on the gate rotor. Segment HJ on the rack is a meshing curve generated by the circular arc H1J1 of radius r2 on the main rotor. Segment JA is a circular arc of radius r on the rack, AB is an arc which can be either a circle or a parabola, a hyperbola or an ellipse, segment BC is a straight line on the rack matching the involute on the rotor round lobe and CD is a circular arc on the rack, radius r3.More details of the “N” profile can be found in Stosic, 1994.2.4.12 Characteristics of “N” ProfileSample illustrations of the “N” profile in 2-3, 3-5, 4-5, 4-6, 5-6, 5-7 and 6-7 configurations are given in Figs. 2.16 to Fig. 2.23. It should be noted that all rotors considered were obtained automatically from a computer code by simply specifying the number of lobes in the main and gate rotors, and the lobe curves in the general form.A variety of modified profiles is possible. The “N” profile design is a compromise between full tightness, small blow-hole area, large displacement.Fig. 2.16 “N” Rotors in 2-3 configurationFig. 2.17 “N” Rotors in 3-5 configurationFig. 2.18 “N” Rotors in 4-5 configurationFig. 2.19 “N” Rotors in 4-6 configurationFig. 2.20 “N” Rotors compared with “Sigma”, SRM “D” and “Cyclon” rotorsFig. 2.21 “N” Rotors in 5-6 configurationFig. 2.22 “N” Rotors in 5-7 configurationFig. 2.23 “N” rotors in 6/7 configurationsealing lines, small confined volumes, involute rotor contact and proper gate rotor torque distribution together with high rotor mechanical rigidity.The number of lobes required varies according to the designated compressor duty. The 3/5 arrangement is most suited for dry air compression, the 4/5 and 5/6 for oil flooded compressors with a moderate pressure differenceand the 6/7 for high pressure and large built-in volume ratio refrigeration applications.Although the full evaluation of a rotor profile requires more than just a geometric assessment, some of the key features of the “N” profile may be readily appreciated by comparing it with three of the most popular screwrotor profiles already described here, (a) The “Sigma” profile by Bammert,1979, (b) the SRM “D” profile by Astberg 1982, and (c) the “Cyclon” profile by Hough and Morris, 1984. All these rotors are shown in Fig. 2.20 where it can be seen that the “N” profiles have a greater throughput and a stiffer gate rotor for all cases when other characteristics such as the blow-hole area, confined volume and high pressure sealing line lengths are identical.Also, the low pressure sealing lines are shorter, but this is less important because the corresponding clearance can be kept small.The blow-hole area may be controlled by adjustment of the tip radii on both the main and gate rotors and also by making the gate outer diameter equal to or less than the pitch diameter. Also the sealing lines can be kept very short by constructing most of t
- 温馨提示:
1: 本站所有资源如无特殊说明，都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等，如果需要附件，请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸，网页内容里面会有图纸预览，若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对用户上传分享的文档内容本身不做任何修改或编辑，并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容，请与我们联系，我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
人人文库网所有资源均是用户自行上传分享，仅供网友学习交流，未经上传用户书面授权，请勿作他用。
川公网安备: 51019002004831号