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Due to the leakage of the interstage seal, the pressure on the impeller wheel cover side is reduced and the pressure on the wheel side is increased, so that the axial force is increased; and the back pressure of the pipe network is increased due to the K480 turbine compressor, resulting in the wheel side The increase in pressure also increases the axial force F. Thus, due to the increase of the axial force, the balance system of the original axial force is broken, and the rotor is offset to the thrust bearing. If the oil pressure between the thrust disk and the thrust block cannot cancel the increased axial force, the thrust of the rotor The disc will inevitably stick to the thrust block and dry friction, causing the thrust block alloy to wear and the shaft displacement to climb until it jumps.
The thrust bearing is actually a bearing that combines the supporting action and the thrust action. The axial force of the K480 turbine compressor is borne by the thrust bearing. The thrust block and the thrust plate have a gap of 01250135mm to facilitate the formation of the oil film, and the thrust block can swing. When the thrust plate rotates at a high speed, the lubricating oil is brought into the gap between the thrust plate and the thrust block, thereby generating dynamic oil pressure to balance the axial force. During maintenance, if the following conditions occur in the assembly of the thrust bearing, such as the inner diameter axis of the thrust bearing and the verticality of the thrust ring surface exceed the tolerance requirements; the parallelism of the two sides of the thrust ring exceeds the tolerance requirement; the bearing pin does not have a positioning function; The mid-section contact surface is not smooth or staggered; the bearing is clamped in the bearing seat; the thickness of the thrust block is inconsistent, which affects the uniform distribution of the axial force on the thrust block and the bearing capacity of the oil film. The displacement is stable.
The reasons for the increase of the shaft displacement of the K480 turbo compressor are various. It is required that the chemical personnel should be careful in the operation and find out the problems in time; the maintenance workers should be serious in the maintenance, especially in balancing, aligning and installing. Thrust bearings.
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