论文总字数：21371字

摘 要

球阀是以球体作为封锁件的主要割断类阀门。本设计是以固定球球阀为设计对象，主要介绍了固定球球阀的基本原理，结构组成与一些它的特点。固定球球阀的设计计算包括很多内容，包括阀门主要通用零件的设计计算和球阀专用零件的计算，这其中又有强度.应力等校核。其中，阀门的密封是设计的关键一环，另外阀杆的设计计算也是一个重点。结合任务书的要求，完成设计计算书与图纸绘制，最终能够了解阀门产品的设计和检验方法。

关键词：固定球球阀 设计计算 结构设计 强度校核

DN350,PN40 Design of fixed ball valve

Abstrac

Ball valve is the main trancated valve with the ball as the closing part. This design takes the fixed ball valve as the design object, mainly introduces the basic principle, structure and some characteristics of the fixed ball valve. The design and calculation of the fixed ball valve includes many contents, including the design and calculation of the main general parts of the valve and the special parts of the ball valve, which also includes the evaluation strength and stress. Among them, the valve seal is a key part of the design, and the design and calculation of the valve stem is also a key point. According to the requirements of the specification, complete the design calculation and drawing, and finally understand the design and inspection methods of valve products

Key Words: Fixed ball valve; design calculation ; Structural design; Strength check

目 录

摘要····················································I

ABSTRACT ··············································II

第一章 绪论············································1

1.1 引言···············································1

1.2 阀门行业发展情况···································1

1.3 球阀的发展历史·····································2

1.4 本设计主要研究内容·································2

第二章 球阀的基本原理·································3

2.1 球阀的特点·········································3

2.2 固定球球阀特点·····································3

第三章 固定球球阀的设计与计算·······················5

3.1 设计基本参数与要求·································5

3.1.1基本参数 ······································ 5

3.1.2 结构设计要求···································5

3.1.3 强度计算部分要求·······························6

3.2 固定球球阀通道截面直径和球体直径的确定·············6

3.2.1 固定球球阀通道截面直径的选择···················6

3.2.2 球体的半径选择·································6

3.3 固定球球阀的密封比压计算···························7

3.3.1 密封面设计比压的计算···························7

3.3.2 密封面必须比压·································9

3.4阀座自动泄压的计算，根据活动套筒外径来确定是否合格·9

3.5 固定球球阀转矩的计算·······························10

3.5.1 阀座密封圈跟球体之间的摩擦力矩·················10

3.5.2 阀杆填料的摩擦转矩的计算·······················10

3.5.3 阀杆台肩跟止推垫之间的摩擦力矩·················11

3.5.4 阀杆轴承摩擦力矩的计算·························11

3.6 固定球球阀滑动轴承的承载能力的计算·················12

3.7 固定球球阀阀杆与球体接触面部分的强度计算··········13

3.8 固定球球阀的阀杆强度校核···························14

3.9 驱动装置的选择·····································16

第四章 固定球球阀主要通用零件的设计计算············17

4.1 阀体壁厚的计算······································17

4.2 阀体中法兰连接的计算································18

4.2.1 螺栓和双头螺柱的强度计算························18

4.2.2 法兰的强度计算··································20

4.3 填料装置的计算······································22

4.3.1 填料箱孔的主要尺寸参数··························22

4.3.2 填料装置主要零件的强度校验······················22

第五章 固定球球阀设计的成本核算······················25

5.1 人工成本············································25

5.2 设备制造费用········································25

第六章 总结 ············································26

参考文献·················································27

致谢 ····················································29

第一章 绪论

1.1 引言

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