A Calculation Method of Critical Load of Parallel Shaft Gear Compressor

Abstract

A critical load calculation method of parallel-shaft tooth-typed compressor belongs to the field of rotating mechanical rotor dynamics and particularly includes following steps: (1) obtaining required parameters of critical loads of the parallel-shaft tooth-typed compressor; (2) calculating dynamic characteristic parameters of each gear output shaft under different powers according to the obtained parameters; (3) inputting the dynamic characteristic parameters into a dynamic equation and calculating a first-stage critical rotating speed, a second-stage critical rotating speed and a third-stage critical rotating speed of each gear output shaft under different powers through a transfer matrix method; (4) fitting the first-stage critical rotating speed, the second-stage critical rotating speed and the third-stage critical rotating speed of each gear output shaft under different powers through a polynomial to obtain fitting functions of each critical rotating speed; and (5) according to an operation rotating speed and the critical rotating speed fitting function of each gear output shaft, determining whether a critical rotating speed of each gear output shaft exists or not in design and calculating the particular critical rotating speed. The method is used for determining whether the critical load of each gear output shaft exists or not during design of the parallel-shaft tooth-typed compressor, thereby guiding a designer to optimize design of the compressor.

Description

Technical field [0001] The invention belongs to the technical field of rotor dynamics of rotating machinery, and relates to a method for calculating the critical load of a parallel shaft gear compressor. Background technique [0002] Parallel shaft gear compressors are widely used in compressing air and carbon dioxide in process industries such as petroleum and petrochemical due to their high operating efficiency and compact structure. In the actual operation process on site, it was found that the parallel shaft gear compressor was operating at rated speed due to excessive vibration due to the adjustment of the pneumatic load. The fault caused by this problem is the critical load fault. In the book Diagnosis and Self-healing of Mechanical Failures written by academician Gao Jinji, an expert in equipment failure diagnosis, discusses and studies critical load failures, and successfully solves the critical load failure of a parallel shaft gear compressor. [0003] Critical load failu...

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Problems solved by technology

[0003] The critical load fault is a fault of excessive vibration caused by the change of the operating conditions of the parallel shaft gear compressor. The change of the aerodynamic load due to the change of the inlet guide vane of the compressor affects the change of the rigidity of the compressed gas working rotor support bearing. , and the change of the bearing stiffness will affect the change of the critical speed of the rotor at each stage. When the critical speed of a certain stage coincides with the rated speed during the stiffness change process, resonance will be caused, resulting in abnormal vibration of the unit. Once the vibration is too large, it will Caused a car jump, resulting in the production being forced to stop

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