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南昌航空大学科技学院毕业设计（论文）任务书I、毕业设计(论文)题目： 制育秧钵机设计II、毕 业设计(论文)使用的原始资料(数据)及设计技术要求： 设计一制育秧钵机，要求： （1）按规定的尺寸制出育秧钵； （2）每小时生产3000个左右； （3）结构简单，体积小，拖动功率小，维修方便，造价低。III、毕 业设计(论文)工作内容及完成时间：1. 收集资料、外文资料翻译、开题报告 第1周第2周2. 传动方案的确定 第3周第4周3. 参数确定及设计计算 第5周第7周4. 制育秧钵机装配图设计及零部件图设计 第8周第15周5. 撰写毕业设计论文 第16周第17周 、主 要参考资料：1 璞良贵，纪名刚主编.机械设计.第七版.北京：高等教育出版社，20012孙桓，陈作模主编.机械原理.第六版.北京：高等教育出版社，20023 成大先主编.机械设计手册.北京：化学工业出版社，20044 赵学田主编.机械设计自学入门.北京：冶金工业出版社，19825 Ye Zhonghe, Lan Zhaohui. Mechanisms and Machine Theory. Higher Education Press, 2001.7 航空与机械工程 系 机械设计制造及其自动化 专业类 0781052 班学生：黄志林 填写日期： 2011 年 01 月 03 日指导教师：助理指导教师(并指出所负责的部分)：机械设计制造及其自动化 系主任（签名）：附注:任务书应该附在已完成的毕业设计说明书首页。学士学位论文原创性声明本人声明，所呈交的论文是本人在导师的指导下独立完成的研究成果。除了文中特别加以标注引用的内容外，本论文不包含法律意义上已属于他人的任何形式的研究成果,也不包含本人已用于其他学位申请的论文或成果。对本文的研究作出重要贡献的个人和集体，均已在文中以明确方式表明。本人完全意识到本声明的法律后果由本人承担。作者签名： 日期：学位论文版权使用授权书本学位论文作者完全了解学校有关保留、使用学位论文的规定，同意学校保留并向国家有关部门或机构送交论文的复印件和电子版，允许论文被查阅和借阅。本人授权南昌航空大学科技学院可以将本论文的全部或部分内容编入有关数据库进行检索，可以采用影印、缩印或扫描等复制手段保存和汇编本学位论文。 作者签名： 日期：导师签名： 日期：毕业设计（论文）开题报告题目 制育秧钵机设计专 业 名 称 机械设计制造及其自动化班 级 学 号 078105212学 生 姓 名 黄 志 林指 导 教 师 吴 晖填 表 日 期 2011 年 01 月 03 日一、 题依据及意义 本次设计的目的是为了能综合运用本专业所学知识，融会贯通。巩固大学四年来所学专业基础知识和专业知识,并运用所学的冷冲机械设计与优化设计知识,解决机械设计中的实际问题,提高分析问题,解决实际问题的能力. 目前，建设社会主义新农村是我国的一项政策。在建设社会主义新农村的过程当中，提高农业机械的生产效率、降低农业机械的成本是不容忽略的。从这一个方面来说，本课题制育秧钵机的改进设计响应国家政策，是有利于农村发展的，具有长远的发展前景。 另一方面，通过本次设计提高外语、专业、计算机的综合能力，创新开发研究能力及严谨的工作作风，提高实际工作能力。着重是培养综合运用所学知识独立分析、设计、解决实际生产问题和其它一些综合能力，特别是工作能力，养成良好的工作态度、工作作风。另外，还可进一步熟悉有关标准和规范，能够熟练使用有关设计手册和熟悉编写技术文件和设计说明书，进一步提高科技写作的能力，加强对冲压工艺与模具设计的了解。 本次设计，根据给定的旧式育秧钵机机构，分析其工艺性及经济性，创新设计新的更合理的育秧钵机。在设计过程中，先进行设计调研，全面了解育秧钵机的发展现状和主要技术参数，从而使我在设计过程中具有较强的针对性，才能在设计正确合理的基础上敢于创新。二、 国内外研究概况及发张趋势（含文献综述） (一)国内外研究概况中国是个农业大国，在农业生产过程中培育良好的秧苗是一个重要的环节。育苗技术是农业科技一直关注的。随着现代农业机械的发展，良好的育苗器械是培育好育苗的关键。因此育秧钵机的研究与发展在近些年取得了显著的成就。下面是对育秧钵机相关资料的整理。 1.浙江理工大学机械工程系博士研究生杨文珍对圆盘式精密播种制钵机运动学进行优化设计。针对圆盘式精密播种制钵机钵体的定位精确、冲压机构和钵盘机构之间运动配合紧凑，易发生干涉等问题，在分析圆盘式精密播种制钵机工作原理的基础上，结合新的精密播种制钵工序，对制钵机的冲压机构和钵盘机构分别进行运动分析；研究两者的配合规律，推导出相应的位移方程，并在VB6.0平台上进行运动学仿真模拟，得到了避免机构发生干涉条件和满足机构运动要求的参数，实现了圆盘式精密播种制钵机的精密播种和营养钵体制造功能。机构运动仿真表明：冲压制钵的时间在一个运动周期内所占的比例应少于58.4%，制钵机可以避免干涉，实现精密播种和制造营养钵。 2.上海市农机局的下属农机研究所研制的ZB810型棉花育苗制钵机，机构紧凑、性能良好、适应田间作业。制成的钵体表面光滑、外紧内松、符合农业要求。育苗移栽后的棉花可全苗早发，增加伏前桃和伏桃，比其他移苗增产20%以上，劳动效率提高1-2倍。 3.我国制育秧钵机的发展历程和美国、日本等发达国家有一定的距离。我国在70年代才开始研制水稻传统育秧的半机械化及机械化插秧机和拔秧机。80年代后，引进日本技术，研制了带土苗育秧和插秧机械，而对播种机械研究较少。 4.随着机械制造技术的发展及加工技术与工艺的现代化，出现了轻便，可在不同时制育各种秧苗的制钵机。型制钵机边是其代表，这中制钵机是棉花、玉米、烤烟和蔬菜等农作物实施营养钵育苗移栽机械化技术的先进适用机具，属于种植业农业机械。该机由减速机构、搅土机构、间歇定位机构、曲柄滑块冲压等机构组成。(二)新老育钵机的比较 育秧钵最早是用手工制造的，其步骤如下： （1） 将肥料和土壤搅拌均匀，用筛子筛细； （2） 将上述土壤放入一个模子中； （3） 用一冲头将土壤冲紧，冲头下部有一凸头； （4） 再将模子托起，育秧钵被冲出； 1.老式制钵机 这种制作方法很像制作蜂窝煤。它的动作过程是这样的：电动机1经带传动、齿轮传动将动力和运动传给齿轮7。齿轮7一方面通过偏心销使运动经由连杆8传动滑动支架作上下移动，另方面齿轮7又由一对锥齿轮将运动传到端面凸轮离合器11（它和轴用导向键联接，不仅能随陬转动，而且还能在轴上移动）。若端面凸轮在旁边固定着的从动滚子10的强制下，向上抬起并压缩弹簧，离合器11就处在脱开状态，在其下面的齿轮9（和轴空套）就不会转动。当端面凸轮继续转到凸轮凹面与从动滚子10接触时，端面凸轮就会在弹簧力的作用下向下推移。是离合器啮合，运动就经过齿轮9带动转盘转动。当转到一定位置时，凸轮会再次转到凸轮面与滑轮接触，此时凸轮又会在滑轮的强制下使离合器再次脱开，齿轮9就会停止转动。这一过程恰好转盘转过60，而被定位销20销住，也就是在转盘停顿的时间里，滑动支架正好带着固定在它上面的压紧冲头和冲出冲头在模孔中作一次上下往复运动，以完成压紧和冲出一只育秧钵的过程。 这种制钵机有如下的缺点： （1） 结构复杂、零件较多； （2） 容易损坏、不易维修； （3） 造价较高。 2.新方案的形成 在设计新的制钵机时有下面几点值得改进： （1） 育秧钵机的压制压力较小，用手制造时估计冲击压力约为100公斤左右，故压紧机构可以设计得简单一些； （2） 老式制钵机的转盘是间歇运动，是靠端面凸轮离合器实现的。凸轮每转动60就停顿一次，机构比较复杂，凸轮不易制作，且容易失效，造价也高。如果有办法在转盘转动的同时进行压紧和冲出动作，就可以取消定位装置和端面凸轮离合器专职，这样，动作和机构都比较简单、也不容易失效； （3） 搅拌叉19可以直接装在齿轮9的轴上、省掉一对锥齿轮； （4） 用转盘的方法将模孔转位，此方法比较见大，应该保留； （5） 传动机构比较简单，如有可能当然还可以设计得更简单一些。 这样，在参考老式制钵机的基础上加以改进，就形成了一个新的设计方法。3、 研究内容及实验方案 1.研究内容 电动机的选择，传动件的设计，执行机构的设计及设备零部件等的设计。 2.实验方案 （1）先查阅相关资料，掌握育秧钵机的大体机构；（2）对其运动及受力参数进行分析计算；（3）主要零件的强度校核；四、目标、主要特色及工作进度 目标：1）每小时能生产3000个左右；2）结构简单、体积小、拖动功率小、维修方便、造价低。 主要特色：结构简单、生产效率高、拆装方便、较好的制造工艺，性能稳定。 工作进度：1、 收集资料、外文资料翻译、开题报告 (第1周第2周)2、 传动方案的确定 (第3周第4周)3、 参数确定及设计计算 (第5周第7周)4、 制育秧钵机装配图设计及零部件图设计 (第8周第15周)5、 撰写毕业设计论文 (第8周第15周)五、参考文献1 杨文珍,陆秋君,赵匀. 圆盘式精密播种制钵机运动学优化设计. 浙江大学学报（农业与生命科学版）31（3）：346350,20052 杨文珍,赵 匀,陆秋君. 精密播种制钵机计算机分析与设计.中国农机化2004(1):31343 韩豹，马守义，韩许.2Z-2型玉米钵育苗移栽机的研制.现代化农业.1996(11):134 杨文珍,赵匀,李革,俞高红.播种制钵机的研究与展望.农机化研究.20031(1):56575 赵学田.自动机械自学入门. 北京：冶金工业出版社，19826 Patton W.J. Mechanical Power Transmission .New Jersey: Prentice-Hall, 19807 濮量贵，纪名刚.机械设计.7版.北京：高等教育出版社，20018 Mechanical Drive (Reference Issue).Machine Design. 52(14), 19809 庞启淮.小功率电动机应用技术手册.北京：机械工业出版社，199610 王世刚，张秀亲，苗淑杰.机械设计实践.哈尔滨：哈尔滨工程大学出版社，200311 徐灏.机械设计手册.2版. 北京：机械工业出版社，2001 12 陆玉,何在洲,佟延伟.机械设计课程设计.3版. 北京：机械工业出版社，200013 孙桓，陈作模主编.机械原理.6版. 北京：高等教育出版社，200114 机械设计手册编委会.机械设计手册.新版.北京：机械工业出版社，200415 林景凡，王世刚，李世恒.互换性与质量控制基础. 北京：中国科学技术出版社，199916 刘鸿文.材料力学.3版. 北京：机械工业出版社,1992南昌航空大学科技学院学士学位论文制育秧钵机设计学生姓名：黄志林 班级：0781052指导老师：吴晖摘要：老式制育秧钵机由蜂窝煤成型机改进得来，体积庞大，结构复杂，成本高，效率低。本设计从老式制育秧钵机出发，在传动系统和执行机构上都做了很大的改进。本机每小时能生产3000个钵体，可广泛应用于玉米、蔬菜、瓜果等秧苗的制钵。该机采用单相电动机做动力源，可在广大的农村使用，不用担心需要较高的动力电压的问题。文中较详细的设计了制育秧钵机的传动系统和执行机构，对各个零件做了具体的结构尺寸设计，并对受载荷较大的零件进行了精确的校核。包括齿轮、带轮、轴和轴承等零部件的校核。该机的设计大量运用标准件，大大缩短了设计工作量和降低了生产制造周期及成本。主要设计内容有：方案的确定；电机的选择；各轴的转速、功率和转矩计算；带、齿轮、及锥齿轮的设计与计算；轴的最小直径；带、齿轮、及锥齿轮的尺寸计算以及方案图、装配图和零件图的绘制。关键词：制育秧钵机 钵体 传动系统 执行机构 指导教师签名：Design of the legacy of seedlingsStudent: Huang zhi lin class : 0781052Supervisor : Wu huiAbstract: The old system of seedlings from the legacy of improvement in the briquettes machine, the size, structure complex, high cost and low efficiency. The design of the legacy from the old system of starting seedlings in the transmission system and executing agencies have done on a lot of improvement. The machine can produce per hour legacy of 4000, can be widely applied to corn, vegetables, fruits and other seedlings of the legacy system. The aircraft uses a single-phase motors to power source, can be used in the vast rural areas, need not worry about a higher power voltage problem. In a more detailed design of the system for the seedlings Bowl drive system and implementing agencies, the various parts to do a specific size of the structure design, and in the larger load of spare parts for the precise calibration. Including gear, pulley, and axle bearings and other parts of the check. The extensive use of the aircraft design standard parts, greatly reducing the workload of the design and lower manufacturing costs and manufacturing cycle. Main design elements include: the determination of the project, choice of Motor and the speed of every axial, the calculation of power and torque, the design and calculation of the belt or gear and the Bevel gear, the smallest diameter of axis, calculation to the size of belt wheel and gears and Bevel gear and protracting the drawing of the project and the assemblage and the part.Key words: the legacy of the legacy of seedlings Bowl transmission system Implementing agencies Signature of the Supervisor: IILow-cost wind power can provide a new wind turbine Abstract: The first generation of commercial proliferation of enhanced wind turbine (DAWT) in New Zealand has just begun trial operation two years, if the developers to achieve the expected results, this new design of wind machines to be significantly reduced cost of wind power. New Zealand in the distance about 100 km Aokelannan the Waikaretu on top of a hill, a revolutionary new wind turbine is a two-year trial operation. The wind machines and the appearance of conventional wind turbine completely different compared to its height of 17 m, much like a Juwu squatted on the Peak, and the conventional wind turbine is a slender body, tall and towering over the top of the hill. This is put into operation the first generation of commercial proliferation of enhanced wind turbine (DAWT: diffuser augmented wind turbine), if the developers to achieve the expected results, will lead to significant reduction in the cost of wind power. During the trial the new wind turbine technology, can also test the proliferation of Central Cover new materials, high-strength fibers to strengthen the steel reinforced concrete. Such wind turbine on the ground referred to as concrete wind turbine. In business, it is called Vortec7 of wind machines, because it has a 7 m in diameter rotor. Wind machines from nearly 100 small investors, set up a private company - Vortec Energy Limited responsible for the design and construction, the company raised 3.5 million U.S. dollars development of the prototype. Vortec Energy Limited is currently being further raise about 700 million dollars to build two sets of rotor diameter of 20 m of the unit. One of the new units will be in areas of high wind speed test, probably in the vicinity of Wellington, New Zealand, the average wind speed in another area. South Australia state government said that the design has a lot of interest in Adelaide and will speed up the installation of an average wind speed near the crew, because the state government that is a rare wind of renewable energy, the need to promote technical breakthroughs-state advantage of the more Lower average wind speed resource development. Two new type of rotor diameter of 20 m of the unit after the successful operation, Vortec Energy Limited will consider the possibility of Nasdaq Stock Exchange. Vortec7 unit performance data show that the rotor diameter of 20 m below the design to 0.031 U.S. dollars / kWh the price of Internet access, it will enable New Zealand and wind power can compete existing power plants, and other new methods of power generation compared to more Competitive. If Vortec function of wind power generation in this price level, in the development of wind power will rapidly become a powerful new force. Vortec Energy Limited is the backing of entrepreneurs Robin Johannink, he successfully operating a series of operations, but also Pacific Lithium (an extract from seawater lithium companies) backing. Johannink, said Vortec technology is an international product, but the technology in the New Zealand stock market was on the recognition and attention is not too high, in this difficult market. Therefore Vortec Energy Limited is considering the Nasdaq in New York Stock Exchange listing is likely to achieve in 1999. A proliferation of technology U.S. aerospace giant Grumman Space Company (now Northrop Grumman Corporation) spent eight years developing the proliferation of technology and a proliferation of enhanced wind turbine technology patents. It was the spread of a detailed analysis of fluid dynamics and the use of a 5 m in the wind tunnel model confirmed the results. The proliferation of wind turbine rotor in the lower reaches, and its role as a wing, the rear rotor in a low-voltage parts. This suction effect effective in around the rotor speed multiplied. Conventional wind turbine rotor can only be effective use of wind around 60 percent. show a pattern of proliferation. The proliferation of economy is the key to the lowest cost to maximize the size. Wind tunnel studies show that in 45-degree-proliferation structure, the wall of surface wind flow may be two slot maintained by the jet. In the prototype, the total size of the spread of further reduction, through the use of general and exports in diameter than 30 percent of the arc structure, enhance the hardness of Central enclosures. So that the design has been chosen to receive the minimum amount of material the size of the greatest proliferation. Vortec Energy Limited was awarded the Northrop Grumman Corporation with the proliferation of technology for a period of 20 years of global patents and 20 patents since the right to update the permit. Northrop Grumman Corporation to retain their own internal use of the proliferation of technology rather than enhance the commercial market for wind rights. Kenneth Foreman, former Grumman Space research team leader, Vortec Energy Corporation for technical advice, Vortec Energy Limited access to the Grumman Space Research Group eight years on all the records, test reports and patents. 2 materials technology Grumman Space Research Group in the development of proliferation-enhancing technologies in the face of a problem is that commercial-scale wind turbine materials must have high strength and long life, low cost features. Have aluminum, glass fiber, steel and reinforced concrete for the traditional assessment and accounting, but the wind can not meet the requirements of economic development. In all the assessment materials, the most desirable is reinforced concrete, but the use of traditional reinforced concrete, the size of the spread of the wind-rated output can only meet 70 kW. As small-scale units can not enhance the diffusion of technology business development. New Zealand in the use of reinforced concrete towers and the construction of ocean-going boats such equipment has a long history. On this basis, the structural engineer Alexander and Associates in 20 years has developed a new product - high-strength fibers to strengthen the steel reinforced concrete. This new material bending strength is three times the low-carbon steel, basically do not need maintenance. This new material could be economic to build the proliferation of larger, so that there is sufficient wind machines and conventional wind turbine output of the competition. Prototype rotor diameter of 7 m, height of 17 m, the highest output for 1 MW. Will be the construction of two units using the rotor diameter of 20 m, high 52 m, and efforts to 3 MW. The proliferation of the use of two-tier 3 m 1m 30mm of high-strength steel fiber reinforced concrete slab of reinforced composite formed. First laminate along the complex framework of the necessary two-way Wancheng surface and fixed in place. The second laminate on top, bending, and then filling in the foundation board surface two-way lock. Qu then these panels bonded together, and the hardened edge of dealing with a proliferation of segment. Complete assembly of the proliferation of good before the Academy of Engineering, University of Auckland in the single-plate assembly and a good segment of the spread of the stress test samples. 3 equipment balance In addition to enhancing the proliferation of technology and materials technology, wind machines are all conventional. Rotor equipped with a fixed pitch of the four leaves, leaves for the welding of the steel structure, the surface material for glass fiber. David Brown through a rotor speed gearbox or a conventional drivers 1 200min-1, 400V of the ABB companys synchronous generator, inverter generators running. Rotor, gearbox and generator () from the U.S. New World Power Company (New World Power) to provide. Frequency AC-DC rectifier first, and then the inverter for AC 50 Hz, the step-up transformer into the local electricity company 11 kV power grid. Rectifier / converter equipment from Auckland company Santon Technology Co., Ltd. design and manufacture, the company battery chargers and speed drive manufacturers have years of experience. Taking into account the proliferation of size, needs a large and stable foundation to prevent the wind loads and seismic, Lodging. Equipment was installed to a large-diameter circular orbit, the wind machine can along its 360-degree rotation, the rotating device on track with the wind control system for electrical devices (). This arrangement provides the foundation for stability. Because this type of wind turbine could avoid the proliferation of high winds and a protective cover from the rotor impact on the ability of strong winds, which do not need to control a simple design of the rotor blade pitch. This makes this type of wind turbine is very suitable for use in windy areas, and maintenance is very small. 4 design advantages The proliferation of enhanced wind machines compared with conventional wind turbine has many advantages, including: Low noise. Conventional wind turbine noise from the maximum speed at the top of the rotor and blade-through to the pillars. In Vortec unit, the rotor was a high-density material covered by the (proliferation of), which prevent the noise from the rotor end of the field radiation and therefore did not, as with conventional equipment, a major pillar of the noise. Less land. On the same terms of energy output, Vortec unit compared with conventional wind turbine requires less space, reducing the land purchase and rental costs. Without affecting the landscape. Vortec unit easily painted various colors, when watched from a distance when integrated with a variety of backgrounds, equipment Dunzuo the shape and undulating mountain village is coordination. Decay may gust. The proliferation of increase in output at the same time, but also as a way throttle, the peak wind gust decay, thus reducing the rotor to withstand the fluctuations and drive away from the stress. Birds less impact. Despite the wind function painted different colors to reduce the visual impact, but the bird flew near the very eye-catching, no birds impact of the rapidly rotating blades of the wind machine accident. Infrastructure costs and low-cost power generation. Wind machines use a very simple set pitch leaves, or do not need to pitch control brake control system. This will significantly reduce maintenance costs, particularly in New Zealands strong winds, and the equipment available to ensure a high rate. 5 prospects Rotor diameter of 7 m prototype wind turbine will be conducted six months of trial operation, the control system carefully debug and verify the design parameters. Initial measurements showed that the wind turbine rotor wind speed increased about 1.72 times, and this Grumman Space Research Group in the calculation of 0.5 m and their model on the results of wind tunnel test match. Vortec Energy companies have access to New Zealand Science and Technology Research Fund of the Ministry of business development funding of about 350,000 U.S. dollars to pay for six months the cost of the trial period. Surveillance and testing programme of technical support from the Industrial Research Ltd (Industrial Research Ltd.) Advisory Group and the University of Auckland (Auckland Uniservices) provide, in addition to the invitation of the British wind energy consulting international experts Garrad Hassan independent inspection and monitoring unit Vortec7 the trial operation Plan. Table 1 gives the Vortec unit future development programmes. If the pilot programme of the results coincides with the expected future proliferation of enhanced wind machines will become a global wind power development plan a major part, can be widely used in other developing regions. Support the technology although investors to bear high-risk, but it may be high returns. 能提供低成本风电的新型风力机 - 【摘要】第一代商用扩散体增强型风力机(DAWT)在新西兰刚开始两年试运行，如果开发者的预期结果得以实现，这种新设计的风力机可促使风电成本大幅度降低。 在距新西兰奥克兰南约100km的Waikaretu的一座小山顶上，一台革命性的新型风力机正在进行为期两年的试运行。这座风力机的外观与常规风力机相比完全不同，其高度为17m，很象一巨物蹲在山顶上，而常规风力机则为一细长体，高高地矗立在山顶上。 这是投入运行的第一代商用扩散体增强型风力机(DAWT: diffuser augmented wind turbine)，如果开发者的预期结果得以实现，将导致风力发电成本大幅度降低。在试验新的风力机技术的同时，也可以试验扩散体环罩的新材料、高强钢丝纤维加强的钢筋混凝土。此种风力机在当地被称为混凝土风力机。在商业上，它被称为Vortec7型风力机，因为它有一个7m直径的转子。 风力机由近100家小型投资商组建的私人公司-Vortec能源有限公司负责设计和建设，该公司筹集了350万美元开发原型机。Vortec能源有限公司目前正在进一步筹集约700万美元，拟建设两台转子直径为20m的机组。其中一台新机组将在高风速地区试验，很可能在新西兰的惠灵顿附近，另一台在平均风速区。南澳大利亚州政府已对设计表示了很大的兴趣并将在Adelaide附近加速安装平均风速机组，因为州政府认为风力是一种少有的可再生能源，需要从技术上突破来带动州内占优势的较低平均风速资源的开发。 两台新型的转子直径20m的机组成功地运行后，Vortec能源有限公司将考虑在Nasdaq股票交易所上市的可能性。Vortec7机组的性能数据表明，转子直径20m的设计能够以低于0.031美元/kWh的价格上网，它将使风力发电可与新西兰现有的电厂相竞争，与其它新的发电方式相比，更具竞争力。如果Vortec型风力机能以这种价格水平发电，在风电开发中它将迅速成为一股强大的新生力量。 Vortec能源有限公司的后盾是企业家Robin Johannink，他成功地经营着一系列业务，也是Pacific Lithium公司（一家从海水中提取锂的公司）的后盾。Johannink先生讲Vortec技术是一项国际产品，但该技术在新西兰股票市场上所获得的认可和重视还不太高，难以在此上市。因此Vortec能源有限公司正在考虑在纽约的Nasdaq交易所上市，很可能在1999年实现。 1 扩散体技术 美国的航天巨头Grumman空间公司（现在的Northrop Grumman公司）花费了8年时间开发扩散体技术并拥有扩散体增强型风力机技术的专利。它进行了扩散体流体动力学的详细分析，并使用一5m的模型在风洞中证实了分析结果。扩散体位于风力机转子的下游，其作用就象一个机翼，在转子后部产生低压部位。这种抽吸效应有效地使转子周围的风速成倍增加。常规的风力机只能有效地利用转子周围风速的60%左右。示出了扩散体的流态。 扩散体经济性的关键在于以最低成本获得最大的尺寸。风洞研究表明在45度扩散体结构中，内壁附面流可由两级风槽射流所维持。在该原型中，扩散体的总尺寸进一步减少，通过采用总长与出口直径比为30%的弧形结构，环罩硬度增强。使已选择的设计以最低的材料用量获
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