Tilting-pad bearing used for rotors

Abstract

The invention relates to the technical field of bearings, in particular to a tilting-pad bearing used for rotors. The tilting-pad bearing comprises a shell, a plurality of bearing pads and a plurality of non-bearing pads. Second gaskets used for keeping the rotors and the corresponding bearing pads balanced and stable are arranged on the bearing pads. First gaskets used for keeping the rotors and the corresponding non-bearing pads balanced and stable and used for increasing pre-loading values of the corresponding non-bearing pads are arranged on the non-bearing pads. The thickness of the first gaskets is larger than the thickness of the second gaskets. The tilting-pad bearing is simple in structure and high in practicability.

Description

technical field [0001] The invention relates to the technical field of bearings, in particular to a tilting pad bearing for a rotor. Background technique [0002] Tilting pad support bearings are usually composed of 3 to 5 or more arc-shaped pads that can tilt freely on the fulcrum, so they are also called live multi-pad support bearings, and also called swing pad bearings. Because its pads can swing freely with the speed, load and bearing temperature, multiple oil wedges are formed around the journal. And the pressure of each oil film always points to the center, which has high stability. It can be used in turbo compressors, expanders, gearboxes, water pumps and other occasions. [0003] At present, due to market demand, the span of the rotor is getting longer and longer, the diameter of the rotor is getting bigger and bigger, the weight of the rotor is getting heavier, and the working speed of the unit is getting higher and higher. Correspondingly, such as the rotor insta...

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Problems solved by technology

[0003] At present, due to market demand, the span of the rotor is getting longer and longer, the diameter of the rotor is getting bigger and bigger, the weight of the rotor is getting heavier, and the working speed of the unit is getting higher and higher. Correspondingly, such as the rotor installed on the steam turbine rotor The weight and shape of the tilting pad bearings also increase accordingly. During the use of the conventional tilting pad bearings used in the installation of steam turbine rotors in the prior art, as the span of the rotor becomes longer, the diameter of the rotor becomes larger, the rotor The increase in mass, the higher and higher operating speed of the unit, and the increase in the weight and size of the tilting pad bearings lead to the fact that after the tilting pad bearings are installed on the rotor, the center of the rotor deviates from the bearing due to the gravity of the rotor or the external load. center e (as in Figure 1-Figure 4 As shown), the gap between the non-loaded part of the pad and the rotor becomes larger, which in turn leads to the weakening of the oil film stiffness and oil film damping of the non-loaded part of the pad, resulting in the weakening of the stability of the pad; if the deviation e is too large, it will lead to non-loaded The state between the bearing tile surface and the journal is larger in the middle and smaller on both sides (such as figure 2 As shown), it is easy to form a negative pressure during the working process, which makes the oil film force of this part of the tile unstable during the working process, and the tile swings irregularly

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