Steam Turbine Support Bearing
Date:2016/7/12 20:12:42 Visits: Author:Dongfang YOYIK Engineering Co; Ltd,China Steam Turbine Support Bearing Manufacturer
DESCRIPTION
Function of Supporting Bearing:
Bear the weight of the rotor;
High force due to unbalanced mass of the bearing rotor;
Determine the radial position of the rotor.
Working Principle of Supporting Bearing:
The high-speed rotating rotor journal carries lubricating oil with a certain viscosity below the journal, forming an oil film that supports the rotor. The rotor journal is surrounded by lubricating oil, which avoids dry friction between the rotor journal and the bearing surface.
SUPPORTING BEARING TYPES
(1) Cylindrical bearing
The commonly used circular wedge bearing has an oil inlet near the split surface of the lower bearing (upstream of the journal rotation direction), and when the journal rotates, only one oil wedge can be formed. This type of bearing is called a single oil wedge circular simple bearing, which may experience instability.
(2) Three oil wedge bearing
There are oil inlet ports on both sides of the vertical position of the lower bearing, and there is also an oil inlet port on the upper bearing. When the journal rotates, it can form three oil wedges, so it is called a three oil wedge bearing. This type of bearing may experience instability.
(3) Elliptical bearing
The short diameter in the vertical direction is slightly smaller than the long diameter in the horizontal direction, and there is an oil inlet near the midpoint of the lower bearing (upstream of the journal rotation direction). When the journal rotates, two oil wedges can be formed, and this type of bearing may also experience instability.
(4) Tilting pad bearing
The bearing shell is composed of several arc segments that can rotate around its pivot point. The gap between each bearing segment serves as the oil inlet for the bearing. When the journal rotates, each bearing bush forms an oil wedge. This type of bearing automatically aligns well to the neutral and will not experience instability.
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