While the use of oil seals to retain lubrication in rotating machinery is common, bearing isolator labyrinth seal technology is often selected to protect bearings and lubrication. Manufacturers, repair facilities and users often select bearing isolators for use in harsh applications where conditions such as contamination, shaft misalignments and equipment vibrations are a concern to avoid frequent replacement. Bearing isolators can provide improved reliability and protection of the bearing and extend the mean time between failure (MTBF) of equipment. In a time when facility managers are focused on maintaining costs and limiting production losses due to downtime or unplanned outages is critical, bearing isolator labyrinth seals offer several benefits.
Benefits of Bearing Isolators
Bearing isolator labyrinth seals are used to protect the bearings and bearing lubrication in rotating equipment—such as electric motors, gearboxes, pumps and split pillow block bearings. In simple terms, a bearing isolator consists of a stationary component (stator) and a rotary component (rotor). The assembly of these components creates a narrow labyrinth path through the seal. This design prevents ingress of contaminants into a bearing arrangement.
In many instances, bearing isolators can fit in the same space as an oil seal without requiring modifications to the geometry of the seal location. There are several reasons why a bearing isolator would be selected as an OEM option or as a retrofit in existing equipment. Bearing isolators provide several benefits, including long service life and a noncontact seal configuration that will not damage shaft surfaces.
Contact lip oil seals are a simple solution to retain lubrication in rotating machinery. However, there can be limitations in performance and reliability. Initially, an oil seal can provide adequate sealing characteristics, but over time operating conditions, configuration and condition of the machine can contribute to wear—and eventual failure—of the seal. The average life of a commercial oil seal can be around 1,500 hours depending on application variables. A relatively clean application that meets or exceeds recommended operating parameters for the seal will likely allow for longer service life, compared to applications with harsh environments and increased misalignments, operating temperatures and shaft speeds. The good news is that the MTBF of rotating equipment can be improved and unscheduled shutdowns can be minimized with the use of a bearing isolator, potentially lasting the life of the equipment.
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