Cooling air coditioner unit fault simulating and diagnosing system

Abstract

The cooling air conditioner unit fault simulating and diagnosing system consists of fault simulating unit and data acquisition subsystem communicating via data acquisition instrument and meter and PC. The key part is one air cooled heat pump unit with fault simulating function, and can set and simulate typical faulats of refrigerator unit easily to provide fault sample for the operation of diagnosis system. Main thermodynamic parameters are used as state characteristic quantities of operating refrigerator unit, and the characteristic quantities in different simulated fault states are real-time acquired via the data acqusition subsystem. The operation state of the refrigerator unit is distinguished via mode distinction to reach the aim of real-time monitoring and fault diagnosis of operating refrigerator unit.

Description

technical field [0001] The invention relates to a fault simulation and diagnosis system of a refrigerating and air-conditioning unit. In particular, it is a system that simulates common faults of refrigeration units, measures typical thermal parameters of refrigeration units during operation, and uses a pattern recognition method for fault diagnosis based on the measured thermal parameters. It belongs to the technical field of the combination of refrigeration and air conditioning and artificial intelligence. Background technique [0002] When the refrigeration and air-conditioning system fails, it is often in an abnormal operating state, or even the system stops operating. The most serious consequence is that it directly leads to damage to the system equipment. Second, as the system deviates from normal operating conditions, the comfort of the air-conditioned environment or the required freezing environment cannot be guaranteed. In addition, when the refrigeration and air-...

AI Technical Summary

Problems solved by technology

However, the air conditioning and refrigeration system is becoming more and more complex, the equipment tends to be diversified and large-scale, and the degree of self-control is increasing day by day.

However, when a failure actually occurs, the refrigeration unit will exhibit various characteristics instead of an absolute threshold, which creates a contradiction between alarm sensitivity and false alarm rate

Due to the diversity of refrigeration unit structures and the complexity of the relationship between fault symptoms and fault causes, that is, the same fault symptom often corresponds to multiple fault causes, and the same fault cause may have multiple fault symptoms. The fault diagnosis system of the refrigeration and air-conditioning system with signal threshold has a high false alarm rate and poor diagnosis effect

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