论文总字数：25025字

摘 要

第一章 绪 论 6

1.1闸阀的定义及工作原理 6

1.1.1闸阀的分类 7

1.1.2闸阀的优缺点 7

1.2阀门设计的选题意义 7

1.3阀门的发展 7

第二章 双缸式气动楔式闸阀结构及使用事项 9

2.1工作原理 9

2.1.1双缸的工作方式 9

2.1.2自由控制关阀时间 9

2.1.3气缸耐腐蚀 9

2.1.4密封圈 9

2.2气动阀的结构 10

2.3气动阀的维护要求 10

第三章 阀门的设计与计算 11

3.1阀体的作用 11

3.2阀体的材料选择 11

3.3阀体的结构形式和制造方法 11

3.4确定阀体的相关尺寸参数 11

3.5结构设计与计算校核 12

3.6阀体壁厚的设计与计算 14

3.7中法兰的选择与计算校核 14

第四章闸板的设计与计算校核 20

4.1闸板密封面尺寸参数的选取 20

4.2阀体档宽的设计与计算 20

4.3闸板密封面比压的计算 20

4.4闸板尺寸的确定 21

4.5闸板强度的计算校核 22

第五章 阀杆的设计与计算校核 23

5.1阀杆的总轴向力计算 23

5.2阀杆的直径计算 24

5.3阀杆的稳定性校核 24

5.4阀杆的强度校核 26

5.5其余部分尺寸的确定 28

第六章 阀盖及填料装置的选择与计算 29

6.1填料压盖的选择与计算 29

6.2阀盖的选择与计算 33

6.3上密封座尺寸的设计 35

第七章 气缸的选择与计算校核 35

7.1气缸的直径计算和选择 35

7.2气缸的校核 36

第八章 其他主要零件的选择与校核 38

8.1手轮直径的确定 38

8.2滚动轴承的选择 38

8.3阀杆螺母的计算校核 39

第九章 设计成本的核算 41

9.1前期投资费用 41

9.2设备制造费用 41

9.3总结 42

参考文献 43

致 谢 45

摘要

阀门是生活中常见的一种东西，是组成管路中流体输送系统的成分之一。阀门的使用极广，只要和液体或气体有关的行业都离不开阀门的使用。我国还是以农业经济为基础，要想让农业发展有快速飞跃，与农业有关的部门就得发展迅速，如农药厂和农田水利排灌等部门，这必然会推动阀门的发展。

闸阀在管道上主要起切断作用，可以用来改变介质流动方向和通路断面、控制输送介质，具有节流、调节、分流、导流等功能，具有开关所需的力较小、介质流向不受限制、体形简单铸造工艺性好、结构长度小等优点。

我的毕业设计题目：双缸气动带手动楔式单闸板闸阀设计，其公称通径DN=200mm，公称压力PN5.0Mpa。主要是为了表达阐明楔式闸阀结构的特点，阀门在生活中的生产工作原理，以及气动、手动转换装置的特点。这次阀门设计包括通用标准部件和专业特殊应用部件的设计，以及阀门各部件尺寸的按标准选取、计算和强度校核，密封的设计是关键所在，另外阀杆的强度校核和稳定性校核也是重中之重不和或缺。

我把本次毕业设计课题分为以下几个步骤——1、根据课题给定的公称压力和公称直径确定阀门的基本结构 2、根据任务书进行设计计算3、对阀门结构各部件进行受力分析，并进行部件强度的计算，然后校核稳定性，根据前边的计算参数按标准选取各部件材料4、用Auto CAD绘制总装备图和所有的零部件图。

关键词：楔式闸阀密封面 气动带手动 计算和校核 绘图

Abstract

Valves are a common thing in life, and they are one of the components of the fluid delivery system that makes up the lines. Valves are widely used, whether in agriculture, industry, defense cutting-edge, or transportation, people's lives need a large number of various types of valves. Valves can be used to change the direction of media flow and path section, control the conveying medium, with throttle, adjustment, shunt, diversion and other functions. In the agricultural-based national economy, if you want to carry out agricultural technology transformation, we have to provide a lot of valves, such as: pesticide plants, farmland water conservancy drainage irrigation, electrification and other departments, valves are essential.

The gate valve mainly acts as a cut-off function on the pipe, is a valve that can move along the vertical direction of the center line of the path, with the advantages of less force required for the switch, small erosion of the sealing surface by the working medium when fully open, limited flow of media, good body shape simple casting process, small structure length and so on.

My graduation design topic: double-cylinder pneumatic belt manual wedge single gate gate valve design, its common name pass diameter DN , 200mm, nominal pressure PN5.0Mpa. This valve design includes the design of common standard components and special application components, as well as the valve component size according to the standard selection, calculation and strength verification, seal design is the key, in addition to the strength of the stem verification and stability of the core is also the most important.

I divided this graduation design topic into the following steps - 1, according to the subject given the nominal pressure and the nominal diameter to determine the basic structure of the valve 2, according to the task paper design calculation 3, the valve structure components for force analysis, and component strength calculation, and then the core stability, according to the previous calculation parameters according to the standard selection of component materials 4, with CAD Auto to draw the total equipment map and all parts map.

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