Device diagnosis device, freezing cycle device, fluid circuit diagnosis method, device monitoring system, and freezing cycle monitoring system

Abstract

A failure diagnosis apparatus for a refrigerating cycle had a problem that it has a low precision because the fluid is treated, and it is difficult to detect a foretaste of failure, absorb individual differences of real machine in the failure determination, and determine a cause of failure. Also, no cheap and practical diagnosis apparatus and method are provided. A plurality of instrumentation amounts concerning the refrigerant such as the pressure and temperature of the refrigerating cycle apparatus or other instrumentation amounts are detected, the state quantities such as composite variables are acquired by making the arithmetic operation on these instrumentation amounts, and whether the apparatus is normal or abnormal is judged employing the arithmetic operation results. If learning is made during the normal operation, a current state is judged, and if learning is made by compulsorily performing the abnormal operation, or if the abnormal operating condition is operated during the current operation, a failure foretaste such as a critical operation can be made from a change in the Mahalanobis distance. Thereby, the secure diagnosis can be implemented with a simple constitution.

Description

technical field [0001] The present invention relates to technologies related to fault diagnosis and monitoring of equipment such as compressors of refrigerating cycle equipment used in refrigeration equipment and air-conditioning equipment, fluid circuits, blowers, and other equipment and equipment. Background technique [0002] As the fault diagnosis of air conditioners, the technology of taking control data such as sensors, set values, and abnormal signals, and then using operating data such as pressure and temperature to store the sequence of operating states under each fault in the microcomputer for fault diagnosis is available. proposal. Refer to Patent Document 1 (JP-A-2-110242 (FIGS. 4 to 11)). On the other hand, attempts to use the Mahalonobis distance as a multivariate analysis method are often made in fault diagnosis. In the past, the signal of the vibration sensor was compared with the normal state. Referring to Patent Document 2 (Japanese Unexamined Patent Publ...

AI Technical Summary

Problems solved by technology

[0005] Although the previous attempts to use control data such as sensors, set values, and abnormal signals, and then use operating data such as pressure and temperature to perform fault diagnosis of the operating state of each fault can judge extreme abnormal states, but there are still problems that cannot be achieved accurately. Questions like good installation

For example, even if an abnormal signal is generated from the alarm unit when the measured value exceeds the preset allowable limit value, it only pays attention to the threshold value of specific operating data, and cannot capture subtle and complex data changes including the entire refrigeration cycle device, so it cannot Possibility detection of abnormality at the moment when the omen of failure appears

[0006] In addition, in order to improve the accuracy, it is necessary to take in too much data and make judgments assuming various states, not only the sensor needs to replace the microcomputer every time the capacity of the microcomputer increases and the target device is changed, etc., it is too expensive , since the threshold value of failure judgment is determined according to the design value or the test of a specific machine, this decision takes a lot of time, and the individual difference of the actual machine cannot be considered, and the possibility of false detection is high

[0007] In addition, even if a multivariate analysis method is adopted, it cannot be put to practical use because the determination of the threshold value is insufficient, or the countermeasure requires a large amount of data, and the cause of the failure cannot be identified, and the monitoring and maintenance for the failure cannot be quickly handled.

[0008] In addition, in the conventional refrigeration cycle apparatus, in order to measure the mixing of air bubbles into the liquid surface of the liquid container or the refrigerant liquid flowing out from the liquid container, it is necessary to install a special sensor for special data, and there are some very expensive devices. problems

[0009] In addition, conventional refrigerating cycle equipment has a problem that it is difficult to install in conventional refrigerating cycle equipment because a special sensor for necessary data is incorporated in the equipment.

[0010] In addition, conventional refrigerating cycle devices detect refrigerant leakage after the amount of refrigerant leakage reaches the limit where normal cooling capacity can be maintained, so there are problems such as being unable to detect refrigerant leakage early and to take countermeasures before reaching the limit.

[0011] In addition, conventional refrigerating cycle devices have the problem of not being able to differentiate between refrigerant leakage and other abnormalities because specific data are used to detect refrigerant leakage.

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