机械密封的分类2
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The classification of mechanical seals 机械密封的分类2
Steven_Tianjin
The classification of mechanical seals 机械密封的分类
If you like the brand of seal you are using have the manufacturer repair it at his facility, or purchase the spare parts from him to insure you will be getting the correct materials and tolerances. It does not make sense to do anything else. 如果你喜欢你正在使用的密封品牌在它的工厂中有制造商维修,或从他们购买备件来确 保你将得到正确的材料和误差.它对于其它事情没有意义 We will now look at the various methods of classifying mechanical seals and in the process learn which to specify for our applications. I will give a brief description of each type and list the most obvious advantages and disadvantages of each. Needless to say the advantage of one is almost always the disadvantage of the other 我们现在将看一下分类机械密封的不同方法,和在过程中学习哪个是为我们的应用指定 的.我将给出每种类型的简单描述,和列出每一个的最明显的优势和缺点.不用说,一个的 优点通常是另外一个的缺点
The classification of mechanical seals 机械密封的分类
The stationary seal The springs/bellows do not rotate with the shaft. 静止密封.弹簧和波纹管不随着轴旋转
Advantage. Misalignment and sealing fugitive emissions is not a problem unless the seal is cartridge mounted. Cartridge mounted stationary seals need some type of self aligning feature.
缺点.所有的密封元件必须抗泵送液体的侵蚀
If the product solidifies or crystallizes when the pump is stopped, the seal can become inoperable 当泵停止时,如果泵送的产品凝固或结晶,密封能变的不能运行
优点.除非密封是一个筒式安装,否则未对准和密封挥发散射不是一个问题.筒式安装静密封需 要一些类型的自对准特征
Disadvantage. Alignment requires that the rotary unit be absolutely square to the shaft and, in a cartridge seal, this is very difficult to accomplish because the cartridge tends to cock the face when the set screws are tightened to the shaft. 缺点.对准需要旋转单元与轴端绝对的成直角,在一个筒式密封中,这是非常困难来完成的,因 为当设置螺钉被紧固到轴时筒倾向于翘起
The classification of mechanical seals 机械密封的分类
Not your first choice in slurry applications because centrifugal force will not throw the solids away from the moveable components. Slurry is defined as solids in liquid. Their size and quantity are not important. 在浆状物的应用中不是你的首选,因为离心力将不能从移动的元件中甩出固体.奖状物定 义为液体中的固体.它们的尺寸和数量不是重要的 You must be careful when introducing cooling to this type of seal because the unit does not rotate, causing an uneven cooling of the lapped face. 当你引入冷却到这些类型的密封中时你必须当心,因为单元不旋转,引起重叠面上不均的 冷却 In recent years this seal has only been available in cartridge designs adding to the misalignment problem and increasing the initial cost considerably. 在最近的一些年中,这个密封已经仅仅被利用在筒式设计中,增加了未对准问题和相当的 增加初始的费用
The classification of mechanical seals 机械密封的分类
The inside mounted seal. All components are in the pumping fluid.
内侧安装密封,所有的元件在泵送的液体内
Advantage. The elastomer can move to a clean surface as the seal face wears. Centrifugal force throws solids away from the seal components allowing the lapped seal faces to stay in co 优势.随着密封面的磨损弹性体能够移到一个清洁的面.离心力从密封元件中甩出固体, 允许密封面保持在一起 Disadvantage. All the metal components must be corrosion resistant to the pumping fluid.
The classification of mechanical seals 机械密封的分类
The rotating seal. The springs/ bellows rotates with the shaft 旋转密封.弹簧/波纹管随着轴旋转
Advantage. Lowest cost and reasonably self cleaning, especially in those designs where the springs are located outside of the sealing fluid. 优势.最底的费用和适度的自清洁,特别是在那些设计中,那里弹簧位于密封液体的外面 Disadvantage. Sensitive to misalignment between the shaft and the stuffing box face. This causes the seal to move back and forth twice per shaft revolution. Gaskets and thermal expansion increase the misalignment problem. Most of these designs cannot pass 缺点.对轴和填料箱面之间的未对准敏感.这引起密封在轴的每转中向前和向后移动两次.垫圈 和热膨胀增加未对准的问题.这些设计中的大多数不能通过挥发散射测试a fugitive emissions test.
The classification of mechanical seals 机械密封的分类2
Steven_Tianjin
The classification of mechanical seals 机械密封的分类
If you like the brand of seal you are using have the manufacturer repair it at his facility, or purchase the spare parts from him to insure you will be getting the correct materials and tolerances. It does not make sense to do anything else. 如果你喜欢你正在使用的密封品牌在它的工厂中有制造商维修,或从他们购买备件来确 保你将得到正确的材料和误差.它对于其它事情没有意义 We will now look at the various methods of classifying mechanical seals and in the process learn which to specify for our applications. I will give a brief description of each type and list the most obvious advantages and disadvantages of each. Needless to say the advantage of one is almost always the disadvantage of the other 我们现在将看一下分类机械密封的不同方法,和在过程中学习哪个是为我们的应用指定 的.我将给出每种类型的简单描述,和列出每一个的最明显的优势和缺点.不用说,一个的 优点通常是另外一个的缺点
The classification of mechanical seals 机械密封的分类
The stationary seal The springs/bellows do not rotate with the shaft. 静止密封.弹簧和波纹管不随着轴旋转
Advantage. Misalignment and sealing fugitive emissions is not a problem unless the seal is cartridge mounted. Cartridge mounted stationary seals need some type of self aligning feature.
缺点.所有的密封元件必须抗泵送液体的侵蚀
If the product solidifies or crystallizes when the pump is stopped, the seal can become inoperable 当泵停止时,如果泵送的产品凝固或结晶,密封能变的不能运行
优点.除非密封是一个筒式安装,否则未对准和密封挥发散射不是一个问题.筒式安装静密封需 要一些类型的自对准特征
Disadvantage. Alignment requires that the rotary unit be absolutely square to the shaft and, in a cartridge seal, this is very difficult to accomplish because the cartridge tends to cock the face when the set screws are tightened to the shaft. 缺点.对准需要旋转单元与轴端绝对的成直角,在一个筒式密封中,这是非常困难来完成的,因 为当设置螺钉被紧固到轴时筒倾向于翘起
The classification of mechanical seals 机械密封的分类
Not your first choice in slurry applications because centrifugal force will not throw the solids away from the moveable components. Slurry is defined as solids in liquid. Their size and quantity are not important. 在浆状物的应用中不是你的首选,因为离心力将不能从移动的元件中甩出固体.奖状物定 义为液体中的固体.它们的尺寸和数量不是重要的 You must be careful when introducing cooling to this type of seal because the unit does not rotate, causing an uneven cooling of the lapped face. 当你引入冷却到这些类型的密封中时你必须当心,因为单元不旋转,引起重叠面上不均的 冷却 In recent years this seal has only been available in cartridge designs adding to the misalignment problem and increasing the initial cost considerably. 在最近的一些年中,这个密封已经仅仅被利用在筒式设计中,增加了未对准问题和相当的 增加初始的费用
The classification of mechanical seals 机械密封的分类
The inside mounted seal. All components are in the pumping fluid.
内侧安装密封,所有的元件在泵送的液体内
Advantage. The elastomer can move to a clean surface as the seal face wears. Centrifugal force throws solids away from the seal components allowing the lapped seal faces to stay in co 优势.随着密封面的磨损弹性体能够移到一个清洁的面.离心力从密封元件中甩出固体, 允许密封面保持在一起 Disadvantage. All the metal components must be corrosion resistant to the pumping fluid.
The classification of mechanical seals 机械密封的分类
The rotating seal. The springs/ bellows rotates with the shaft 旋转密封.弹簧/波纹管随着轴旋转
Advantage. Lowest cost and reasonably self cleaning, especially in those designs where the springs are located outside of the sealing fluid. 优势.最底的费用和适度的自清洁,特别是在那些设计中,那里弹簧位于密封液体的外面 Disadvantage. Sensitive to misalignment between the shaft and the stuffing box face. This causes the seal to move back and forth twice per shaft revolution. Gaskets and thermal expansion increase the misalignment problem. Most of these designs cannot pass 缺点.对轴和填料箱面之间的未对准敏感.这引起密封在轴的每转中向前和向后移动两次.垫圈 和热膨胀增加未对准的问题.这些设计中的大多数不能通过挥发散射测试a fugitive emissions test.