A multi-layer composite bush sliding bearing with an oil injection cavity

Abstract

The invention discloses a multi-layer composite bearing bush sliding bearing with an oil filling chamber. The multi-layer composite bearing bush sliding bearing comprises a bearing bush, a shaft neck and a bearing base, wherein the bearing bush is a composite bearing bush which consists of an inner bearing bush and an outer bearing bush, an arc-shaped groove-shaped oil filling chamber is formed in the outer wall of the lower end of the inner bearing bush, and an inner bearing bush thin-wall part is formed between the oil filling chamber and the inner wall of the inner bearing bush; the outer bearing bush coaxially and closely sleeves the inner bearing bush, an oil filling hole communicated with the oil filling chamber is formed in the inner bearing bush, and high-pressure oil is filled into the oil filling chamber by virtue of the oil filling hole; oil inlets are formed in the upper bearing base and the composite bearing bush, the oil inlets are communicated with a wedge-shaped chamber, and common-pressure lubricating oil is injected through the oil inlets; after the lubricating oil is injected, when the shaft neck rotates, and the thin bearing bush thin-wall part is incapable of generating plastic deformation due to an oil film force generated by the lubricating oil; when an external load borne by the shaft neck is high, the bearing bush thin-wall part generates plastic deformation due to the pressure generated by the high-pressure oil, the thickness of the oil film is decreased, and the oil film damping rigidity and the critical speed of a rotor are improved.

Description

technical field [0001] The invention relates to a sliding bearing, in particular to a multi-layer composite bearing pad sliding bearing with an oil injection cavity, which is suitable for large-scale high-speed and heavy-load occasions. Background technique [0002] With the rapid development of construction machinery towards high speed and heavy load, sliding bearings are widely used in large steam turbines and other rotating machinery. Compared with rolling bearings, sliding bearings have the advantages of high load capacity, good vibration resistance, stable and reliable operation, low noise, and long life. The oil film formed in sliding bearings makes the sliding surfaces separated by lubricating oil without direct contact, which can be greatly improved. Reduce friction loss and surface wear, thereby increasing the life of the bearing; in addition, a lubricating oil film with a certain vibration-absorbing ability is conducive to improving the stability and accuracy of be...

AI Technical Summary

Problems solved by technology

For example: when the steam turbine is running at high speed, when the stiffness and damping of the sliding bearing is small, it is easy to cause the steam turbine rotor system to vibrate violently, causing damage to the steam turbine rotor and other unit accidents

[0003] At present, the following methods are generally used to improve the stiffness and damping of the bearing by changing the structure of the bearing pad and journal of the sliding bearing: 1. The stiffness and damping of the bearing can be improved by changing the curvature radius of the bearing pad, but the curved surface processing of the bearing pad is not easy to achieve ; 2. Multiple oil wedges are formed by non-circular modification of the journal to improve the stiffness and damping effect of the bearing, but this is only suitable for the occasion where the journal is fixed and does not rotate; 3. By opening an oil groove on the outer ring of the bearing bush, the Oil grooves of different widths are used to change the bearing rigidity, but processing oil grooves of different widths is not easy for bearings that are already in operation; 4. Connect the elastic pad to the outer ring of the bearing pad with bolts, and add washers to the elastic pad and the bearing pad , so as to adjust the oil film gap between the bearing bush and the journal to affect the stiffness and damping of the bearing, but this method is also inconvenient to implement for the installed bearing

5. The control system controls the expansion and contraction of the execution unit screw to adjust the gap between the tiltable pad and the journal to change the stiffness and damping of the bearing. This method realizes intelligent operation and is convenient, but the structure is complex and there are certain difficulties in realization.

[0004] Therefore, although the current improvements in the structure of sliding bearings can improve the stiffness and damping of the bearings, there are problems such as complex structures, difficult processing, and inconvenient operation.

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