Fed
the seal in axial direction
er
(cup seals)
Sealing Process / 密封原理
1
2
3
1 Uninstalled O-Ring / O型圈安装前
2 O-Ring installed / O型圈安装后
3 Installed O-Ring with pressure / O型圈安装后受力状况
பைடு நூலகம்
Sealing Process / 密封原理
3
Sealing Process / 密封原理
密封件
需密封的表面
流体相对运动方向
As a result of contacting loads, the elastic seal is pressed against the sealing surface / 密封件因受力 而贴紧密封表面，从而起到密封的效果
➢ Housing dimension / 沟槽尺寸 ➢ Side load / 侧向载荷 ➢ Velocity / 速度 ➢ Elasticity / 材料弹性 ➢ Pre-loading / 预紧力 ➢ …...
Seal types ：Classification based on basic radial pressure
Generated by a deformation of the flexible sealing lips (grooved rings)
Generated by a deformation of the entire seal cross-section (compact seals)
Generated by pre-tightening
Groove 凹槽
Pressure Dynamic lip 动态密封唇
Fluid
Dynamic sealing edge 动态密封边
Sealing Process / 密封原理
A Good Sealing System should be: 一个好的密封系统应该是
➢ Has to close the gap completely / 能够关闭整个 密封间隙 ➢ Must be able to follow axial movements of the seal housing / 必须可在密封沟槽内进行自我调整 ➢has to provide excellent dynamic as well as static tightness / 必须既具有良好的动密封，又具有 良好的静密封能力
Sealing Process / 密封原理
Sealing Factors 影响密封效果的因素
➢ Friction / 摩擦 ➢ Pressure / 工作压力 ➢ Medium / 工作介质 ➢ Temperature / 工作温度 ➢ Surface / 表面光洁度 ➢ Compound / 密封件材料
• Y Seal is the same sealing process as O-Ring / Y型圈的 密封原理与O型圈相同
• Contact stress determined with FEA / Y型圈的内部压力分 布情况
• Zero leakage can only be done at ideal situation / 零泄 漏只可在理想状态下实现
Parker 密封件技术交流会
Content 目录
• Parker Seal Group Introduction 密封集团介绍 • Sealing theory 密封原理 • Wiper, Rod seal, Piston Seal and Guide Ring
Introduction 防尘圈，杆封，活塞封和导向环的介绍 • Seal Application in several kinds cylinder 密封组 合在几种油缸中的应用 • Packing Failures Analysis 失效性分析
Sealing Process /密封原理
Principle and terminology relating to a rod seal prior to installation
Housing 沟槽
Tight fit 紧配合
Pressure loss Leakage
Rod
v (m/s)
Static sealing edge 静态密 封边 Static lip 静态密封唇
Sealing Process / 密封原理
A Good Sealing System should be: 一个好的密封系统应该是
➢ Should have lowest possible friction / 应具有尽 量低的摩擦力 ➢ Must offer an appropriate media resistance / 可 抵抗密封介质的腐蚀 ➢ Should have best wear and temperature resistance / 可抗磨损，具有较宽的工作温度范围 ➢ …...
按径向力产生方式分类：
All seals have a basic radial pressure in common to ensure tightness in pressureless condition. Seals can be divided into three groups depending on how their basic radial pressure is generated.
Basic Seal Theory Principles 基本密封原理
• Linear, Reciprocating Systems 线性,往复运动系统
• Rotating Shaft Systems旋转运动 系统
• For application where no leakage is allowed, a contact sealing element is used. 实际应用中，当不允许有泄漏发 生时，那么就必须应用一个密封 系统。