How to choose Bearing Isolator (protector) ?

2018-10-30 14:48:20

  The advantages of the Bearing Isolator compared with the traditional seal forms are gradually recognized by the market. The continuous demand from the end user has prompted more OEMs to consider this new sealing solution, such as pump, motor, gearbox, fan, steam turbine and so on. Although some standard design bearing isolator can be used in some common devices, bearing isolator itself is a product with customized design. Wrong design structure selection will bring a lot of trouble to the maintenance of the equipment in the future.How to select the bearing isolator correctly can be considered from the following aspects:

  1. Lubrication: Oil lubrication, splash lubrication, oil mist lubrication, oil and gas lubrication, immersion lubrication, etc., the corresponding structural design shall be selected according to different lubrication methods.If the bearing isolator for splash lubrication is used in immersion lubrication, leakage will occur.

  2. Axial motion.The clearance of the bearing isolation stationary and rotating ring is determined according to the range of motion of the device shaft.Insufficient consideration of shaft runout, static ring and bearing will contact in operation, result in friction or deformation.Due to insufficient consideration of axial channeling momentum, the isolator is at risk of falling out from the end cover or causing the rotor/stator ring to detach.

  3. Installation.The press fit of interference fits is popular in the market, but it has higher requirements on the equipment bore size tolerance. If the equipment is modified, poor tolerance precision control will cause installation difficulties.Strong vibration, large - size equipment, recommended flange installation.

  4. Operating environment. If the external conditions such as humidity, heavy pollution, etc., the protective structure of the isolator should be improved .

  5. Material selection. Choose metal material or non-metal material, not only from the economic point of view, but also to take consider comprehensively corrosion resistance, heat dissipation performance, thermal deformation, the existence of electric spark, installation and others.

  6. Design experience of the manufacturer.The practical application experience of bearing isolator manufacturer is the biggest guarantee of sealing performance.