TYPES OF TURBOMACHINE BEARINGS - METAL SLIDING BEARING "BABBITT" PATENT скачать в хорошем качестве

TYPES OF TURBOMACHINE BEARINGS - METAL SLIDING BEARING "BABBITT" PATENT

Did you like this content? Sign up at the link below to receive notification of new content like this: http://bit.ly/2JUC69O Join the WhatsApp Group: https://bit.ly/3FY3E6h Learn more about TURBIVAP: https://linktr.ee/turbivap Telegram list: https://t.me/turbinavapor contact: [email protected] #turbinaavapor #steamturbine #turbomachinery #powerplant 00:00 - Presentation 00:27 - Introduction Turbomachinery Sleeve Bearings 00:35 - Babbitt Bearings Function 00:50 - Assembly Slip Bearings 01:00 - Types of Sliding Bearings 01:30 - Hydrodynamic Bearing 02:18 - Hydrostatic Bearing 02:50 - Aerostatic Bearing 03:15 - Magnetic Bearings _________________________________________________ TYPES OF STEAM TURBINE BEARINGS - SLIDING BEARINGS WITH METAL PATENT "BABBITT" When we talk about bearings, there are basically 2 major groups: Sleeve bearings and rotary bearings, better known as bearings. As the subject here is turbomachinery, let's focus on plain bearings, which are the most used in turbines, right? Turbomachinery sliding bearings have a softer material coating inside than the bearing base, in our case this soft material is patent metal called babbitt, whose function is to support the rotor, dampen impacts and preserve the shaft surface, in addition to minimizing friction between the bearing and shaft, thus generating greater turbine efficiency. Sleeve bearings are pushed away or separated from the shaft by a thin layer of lubricant: oil or grease…in the case of turbines, almost always oil. Unlike rotary bearings, plain bearings support a rotating shaft, without the need for rolling elements, so the shaft slides over the bearing…hence the name plain bearing. Furthermore, the service life of a plain bearing is, theoretically, infinite, since there should be no contact between bearing and rotor in relative motion, that is, during standard turbine operation, thus ensuring long equipment operation. As not everything is flowers, in practice things are a little different!!!! Sleeve bearings can be further divided into the following groups: Hydrodynamic Bearings: which are produced in high strength material with an internal coated with patent metal and have a constant supply of a thin layer of lubricating oil between the shaft and this patent metal without significant oil pressure, thus avoiding friction between shaft and bearing. The lubrication pressure here is carried out by the rotation of the shaft itself. They are quite common and used in turbomachinery because they allow them to operate at high speeds and high loads, having a good cost-benefit ratio. A simple detail of the hydrodynamic bearing, but which makes all the difference in its operating principle, as we will see further on, is the existence of a small eccentricity between the center axes of the bearing and the turbine shaft. Hydrostatic Bearings: In these bearings, oil is continuously injected under high pressure into the system with the aid of a pump. Its application is more focused on equipment that needs high precision in the rotation movement and also more extreme loads. So, before starting a turbine with this type of bearing, the oil is pressurized, lifts the rotor and then the turbine starts operating, completely eliminating the contact between the shaft and the bearing. Aerostatic Bearings: I confess that I don't even know, I only know that it uses compressed air instead of oils or greases. Its accuracy is said to be very high, superior to hydrostatic bearings. This type of bearing also does not generate heat, but as we can imagine its manufacturing and maintenance costs are high, preventing its use on a large scale. Magnetic Bearings: These also do not use lubricants, they manage to keep the axle in suspension by the action of magnetic forces. There is already application in some more modern and robust rotating equipment, but its use is still very restricted.