Method for detecting air conditioner refrigerant leakage and air conditioner

Abstract

The invention provides a method for detecting air conditioner refrigerant leakage and an air conditioner. The method comprises the following steps: S1, detecting the fault condition of a compressor before the air conditioner is started; and if the compressor operates normally, executing the step S2; S2, starting the air conditioner to operate, and judging refrigerant leakage conditions in advancethrough refrigerant pressure; and if the pre-judgment result is to be determined, executing the step S3; and S3, calculating the refrigerant remain and further judging the refrigerant leakage conditions. The method for detecting the air conditioner refrigerant leakage and the air conditioner have the advantages of high detection precision and low misjudgment rate.

Description

technical field [0001] The invention relates to the technical field of air-conditioning equipment, in particular to a method for detecting leakage of air-conditioning refrigerant and an air conditioner. Background technique [0002] During the installation process and long-term use of the air conditioner, the pipeline may be damaged due to poor sealing, bending, long-term corrosion or other external force majeure, resulting in leakage of the air conditioner refrigerant. From a fundamental point of view, the leakage of refrigerant is manifested by the reduction of refrigerant flow. Insufficient refrigerant volume will degrade the performance of the air conditioner, making the compressor run in a poor condition. In severe cases, the compressor may even burn out and the air conditioner may explode situation, which poses a greater security risk. [0003] In order to prevent refrigerant leakage, most of the existing technologies prevent refrigerant leakage by adopting more reaso...

AI Technical Summary

Problems solved by technology

However, the corresponding leak detection method has not been improved accordingly, that is, the method of one-time judgment on a single air-conditioning parameter should not be used for leak detection, but should be judged by comprehensively applying the parameters of various air-conditioning systems to avoid The misjudgment of air-conditioning refrigerant leakage caused the air-conditioning to repeatedly shut down for protection

[0004] In recent years, although there have been many detection methods that comprehensively apply the parameters of various air-conditioning systems to judge refrigerant leakage, most of these methods reduce the "threshold" that triggers refrigerant leakage, that is, set a relatively low threshold to improve detection. Accuracy, although this improves the detection sensitivity to a certain extent, but the misjudgment rate is also increased. During the use of the air conditioner, the air conditioner will frequently shut down for protection due to the detection of "refrigerant leakage", which will cause great inconvenience to users. It has the disadvantages of low detection accuracy and high false positive rate

In addition, improper setting of detection parameters will also affect the accuracy of refrigerant leakage

[0005] For example, the Chinese patent with application number 201610887673.2 provides a method for detecting refrigerant leakage of an inverter air conditioner based on speed interval parameters. This method judges the leakage of refrigerant based on the temperature variation of the indoor heat exchanger, but this method has the following defects: First, the temperature change usually needs to be operated for a certain period of time before the accurate and effective data can be obtained; second, the factors affecting the temperature change of the indoor heat exchanger are complex and diverse, such as the temperature difference between the inner and outer sides of the heat exchanger, heat transfer Therefore, the accuracy of this method for refrigerant leakage detection is very limited, and misjudgment is prone to occur.

This method judges the refrigerant leakage by converting the refrigerant concentration into a voltage. Although the detection accuracy is improved to a certain extent, it still has the following defects: First, the refrigerant is judged by the refrigerant gas concentration in the indoor environment. When the outdoor unit When leakage occurs in the medium refrigerant loop, it cannot be detected; secondly, the concentration of refrigerant gas in the indoor environment is greatly affected by the indoor area, ventilation conditions, start-up time, etc., and the judgment of refrigerant leakage is only based on the first voltage after the conversion of the refrigerant gas concentration , low detection accuracy

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