气动笼式调节阀设计终421.docVIP

第一章绪论 PAGE2 / NUMPAGES30 气动笼式调节阀的设计 摘要 先进的现代化工业是以生产自动化为标志的。从自动化系统的发展历史和进步来看，技术工具的变革起着极为重要的作用。各种先进的控制手段虽然不断出现，但基本的控制规律没有改变，而技术工具的变化则是日新月异。调节阀作为自动化系统中关键的技术工具之一也正经历着更新换代。 本论文在详细调查和研究的基础上，分析了目前调节阀行业的发展状况和技术水平，分析了国外先进产品的技术特点和技术优势， 结合本企业的实际情况及国内市场的需求，借鉴国内外调节阀的先进技术，设计了新型的具有特色的气动笼式调节阀。 本设计中解决的关键技术和创新点有：阀体S 型流线型流道设计，减少压降损失，阀体流通能力强，流量大；阀芯的上导向式设计，减少调节阀泄漏点，优化结构，降低成本；更接近理想的阀芯型面设计，流量特性曲线精度更高，提供更大的可调范围。 相信不久的将来，随着各方面技术的不断成熟和发展，会有更先进的调节阀出现。 关键词：笼式调节阀; 阀体流道 ;阀内件结构; 流量 ;可调范围 气动笼式调教阀毕业设计 ABSTRACT  Automation of manufacture is the symbol of advanced modern industry. In view of the development history and improvement of automatic system, the technical tools have taken an important role in it. Many kinds of control methods have been introduced to control system. Though its basic control rule is invariable, technical tools change with each passing day. As a key technical tool of automatic system, control valve is regenerating. Based on detailed investigation and study, the article analyzes development and technical level of control valve, and analyzes technical characteristic and advantages of foreign product. Also, the article analyzes shortages of conventional control valve. Considering our company’s reality and demands of domestic market, the article prefers to design a new type of single-seated control valve of its own features by introducing advanced technique from foreign control valve. The article describes total design project and confirmation of key parameters of the single seated control valve of Wuzhong Instrument Co., Ltd.. And after trail-manufacture, we did some tests. The article analyzes the data gotten from the tests either. Key techniques and innovations: “S” type flow channel is to lower pressure loss, to strengthen flow capability of the valve body and to increase flow. Up-guide structure of valve plug is to decrease leakage points of the control valve, to optimize structure and to lower cost. Perfect outline design of plug provides higher precision of flow