Method for calculating pipeline vibration fatigue life of frequency conversion air conditioner

Abstract

The invention relates to an air conditioner and provides a method for calculating the pipeline vibration fatigue life of a frequency conversion air conditioner. The working conditions of the frequency conversion air conditioner in the refrigerating season and the heating season every year and actual contributions of all frequency points to pipeline vibration need to be combined to estimate the pipeline vibration fatigue life of the frequency conversion air conditioner. The average operating frequency of the frequency conversion air conditioner is calculated through weighting, the working conditions of the frequency conversion air conditioner and the weights of all operating frequency points are determined, fatigue damage of pipelines of the frequency conversion air conditioner in a starting state, an operating state and a halt state within a year is calculated according to fatigue features of pipeline materials and tested vibration maximum stress values at all the frequency points, and the pipeline system vibration fatigue life of the frequency conversion air conditioner is calculated through accumulation of the fatigue damage. The method is suitable for the frequency conversion air conditioner.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a method for calculating the vibration fatigue life of a pipeline of an inverter air conditioner. Background technique [0002] At present, the air-conditioning industry generally uses pipeline stress-strain testing to evaluate pipeline vibration reliability and pipeline vibration life, usually based on the measured maximum stress value of pipeline vibration for evaluation and fatigue life calculation, if the maximum stress value exceeds the enterprise The default standard is regarded as unqualified, but the variable frequency air conditioner is different from the single frequency point working mode of the fixed frequency compressor. The quantities are not the same, and the probability of operation at each frequency point is also different during the normal operation of the air conditioner, so the calculation method for the vibration fatigue life of the inverter air conditioner pipeline is d...

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Problems solved by technology

However, a method for calculating the vibration fatigue life of the pipeline system for inverter air conditioners has not yet been proposed, and the calculation method for the vibration fatigue life of the inverter air conditioner pipeline in the enterprise is still based on the calculation method of the constant speed machine, that is, using a constant allowable Stress [σ] to estimate the vibration fatigue life of pipeline

[0003] With the formation of frequency conversion in the air-conditioning industry, the limitations of the calculation method for the vibration fatigue life of the pipeline of the frequency conversion air conditioner are more obvious. Reliability evaluation and design requirements, it is necessary to combine the actual working conditions of the inverter air conditioner and the actual contribution of each frequency point to the pipeline vibration to propose a method for accurately calculating the vibration fatigue life of the inverter air conditioner pipeline

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