机械密封自学教材.ppt

密封培训 JohnCrane Tech(Tianjin) Co.,Ltd 培训内容概述 密封基础知识 密封系统知识 密封的安装要求 密封的失效大致判断 与客户技术人员进行交流 Concepts of Mechanical Seals机械密封概念 The Basic Sealing Problem:Preventing Leakage基本的密封问题: 防止泄漏 The Concept of anEnd Face Mechanical Seal机械密封端面的概念 Required Features必须的特征 Small axial clearance小的轴向间隙 Self adjusting自调节 A Flexible Seal Flexible 机械密封 Hydrostatic loading流体静力学负荷 Secondary sealing elements辅助密封 Replaceable parts可替换的部件 An Example of a Complete Seal Simply put, a mechanical seal is:简单的说,机械密封就是: 1. A wearable, stationary, primary sealing element 一个耐磨,静止的密封件 2. A wearable, rotating, primary sealing element 一个耐磨,旋转的密封件 3. A secondary sealing element 二次密封 4. A mechanical loading device to press primary sealing elements 1 and 2 against one another, and 使件1和件2相互贴合的机械装置 5. Auxiliary components to complete seal 辅助密封 The Sealing Interface密封接触面 The Sealing Interface密封面 Lubrication Purpose:润滑目的 Separate surfaces分离两个面 Prevent contact of high surface points 防止出现面接触 Reduce friction/heat generation减少摩擦/生热 Process Fluid Acts as Lubricant Between Faces流体在两个面之间充当润滑剂的过程 Without Lubrication, Faces Run Dry And Overheat 没有润滑干运转导致过热 Heat Generation 生热 Rubbing摩擦 Viscous Shear粘性剪切力 Heat Transfer热传递 Conduction传导 Convection对流 Flushing冷冲洗 Removes Heat带走热量 Replenishes Cool Clean Lubricating Liquid 补充润滑液 Primary Seal: Flush基本密封:冲洗 Primary Seal: Flush基本密封:冲洗 Primary Seal: Quench 基本密封:急冷 API Piping Plans API 冲洗方案 第二部分 API Piping Plans API 冲洗方案 API 682 2nd Edition API 682 第二版New Piping Plans 新的冲洗方案 Plan 14 (Plan 11+13) 冲洗方案14 Plan 53’s - Arrangement 3, Contacting Wet (CW) Seals 53 方案-排列方案3，接触式湿密封 53a – traditional configuration 传统构造 53b – bladder accumulator 蓄能器 53c – piston pot/ accumulator 活塞/蓄能器 Containment Seal 二次辅助密封 Plan 72 – Arrangement 2 w/ Containment Seal (CS) Plan 75 – Arrangement 2 w/ Containment Seal (CS) Plan 76 – Arrangement 2 w/ Containment Seal (CS) Gas Barrier Seals 气体 Plan 74 – Arrangement 3, Non-Contacting (NC) Seals排列方式3，非接触式密封 Plan 53a (