CN115540200A

CN115540200A - Method and device for detecting refrigerant abnormity, air conditioner and storage medium

Info

Publication number: CN115540200A
Application number: CN202211032781.3A
Authority: CN
Inventors: 李海军; 李鹏辉; 赵国胜; 贾香慧; 周洪进; 杨青; 张润雨
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2022-12-30
Also published as: WO2024041014A1

Abstract

The application relates to the technical field of intelligent household appliances. A method for detecting the abnormality of refrigerant is disclosed, which is used in the heating operation of air conditioner. The method comprises the following steps: and under the condition that the continuous operation time length of the compressor is greater than or equal To the preset time length, detecting the current indoor environment temperature Tr, the current indoor coil temperature Tp and the current outdoor environment temperature To. When the air conditioner is a fixed-frequency type, the condition of refrigerant circulation is analyzed according to Tr, tp and the current state of the compressor. And analyzing the refrigerant circulation condition according To Tr, tp and To and the current state of the compressor under the condition that the air conditioner is an inverter type. And outputting prompt information of the abnormal refrigerant circulation under the condition of the abnormal refrigerant circulation. The method improves the accuracy of refrigerant leakage detection in a heating state. The application also discloses a device for detecting the refrigerant abnormity, an air conditioner and a storage medium.

Description

Method and device for detecting refrigerant abnormity, air conditioner and storage medium

Technical Field

The present invention relates to the field of intelligent household electrical appliance technologies, and for example, to a method and an apparatus for detecting refrigerant abnormality, an air conditioner, and a storage medium.

Background

At present, the refrigerant abnormity of the air conditioner is the most prominent and common problem in the after-sale feedback, and the system operation can be in an abnormal state after the refrigerant abnormity of the air conditioner. The refrigerant abnormity of the air conditioner directly affects the heating effect of the air conditioner, so the refrigerant abnormity detection is very necessary in the operation process of the air conditioner.

In order to solve the problem of the requirement for refrigerant abnormity detection in the heating operation working condition of the air conditioner, the related technology discloses a method for judging insufficient refrigerant of an air conditioner system and the air conditioner. The technology comprises the following steps: through the scheme of temperature difference between the inner coil and the inner environment, the temperature of the outer environment, control of the inner wind speed and repeated multiple judgment during heating, the characteristic of insufficient refrigerant can be effectively embodied and accurately judged in each use scene of the system, and abnormal faults can be fed back in time.

In the process of implementing the embodiment of the present disclosure, when it is found that the refrigerant is abnormal under the heating operation condition in the related art, the influence on the refrigerant abnormality detection result under the heating operation condition is not considered when the types of the air conditioners are different, the ranges of the current indoor coil temperatures are different, the ranges of the current outdoor environment temperatures are different, and the states of the compressors are different. Therefore, although the refrigerant abnormality detection under the heating operation condition can be performed in the related art, the detection method is not sensitive, misjudgment is easy to occur, and the detection accuracy of the refrigerant abnormality is low.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a method and a device for detecting refrigerant abnormity, an air conditioner and a storage medium, so as to improve the accuracy of refrigerant abnormity detection in a heating operation condition.

In some embodiments, the method comprises: under the condition that the continuous operation time length of the compressor is greater than or equal To the preset time length, detecting the current indoor environment temperature Tr, the current indoor coil temperature Tp and the current outdoor environment temperature To; under the condition that the air conditioner is of a fixed-frequency type, analyzing the condition of refrigerant circulation according to Tr, tp and the current state of the compressor; or, under the condition that the air conditioner is an inverter type, analyzing the condition of refrigerant circulation according To Tr, tp and To and the current state of the compressor; and outputting prompt information of the abnormal refrigerant circulation under the condition of the abnormal refrigerant circulation.

In the above embodiment, when the continuous operation time of the compressor is longer than or equal to the preset time, the logic analysis is performed on the air conditioners of different models respectively. And under the condition that the air conditioner is of a fixed-frequency type, judging the heat exchange quantity of the current air conditioner according to Tr and Tp, and simultaneously eliminating the misjudgment condition possibly occurring in the detection process by combining the current state of the compressor. And when the air conditioner is an inverter type, judging the current heat exchange amount of the air conditioner according To Tr and Tp, and judging the current state of the compressor according To Tr and To. And the misjudgment condition possibly occurring in the detection process is eliminated through the combination judgment and analysis of the heat exchange quantity and the current state of the compressor. The detection method is sensitive and reliable, can reduce the probability of misjudgment, and improves the accuracy of refrigerant abnormity detection in the heating operation working condition.

Optionally, analyzing the condition of the refrigerant cycle according to Tr, tp and the current state of the compressor includes: and if Tp meets the condition of starting defrosting operation, tp-Tr is less than or equal to T1, the compressor starts defrosting operation, and | Tr-Tp | is less than or equal to T1 in defrosting operation, the refrigerant circulation is judged to be abnormal. Wherein T1 is a first temperature threshold.

Optionally, analyzing the condition of the refrigerant cycle according to Tr, tp and the current state of the compressor includes: and if Tr and Tp meet the conditions of overheat protection or temperature-reaching shutdown of the compressor, and the compressor is not in the overheat protection state or the temperature-reaching shutdown state, determining that the refrigerant circulation is abnormal.

Optionally, tp satisfies conditions for initiating defrost operation, including: tp is less than Tep; wherein Tep is the coil temperature threshold.

Alternatively, tr, tp satisfy conditions for compressor over-temperature protection or warm-up shutdown, including: tp is more than or equal to Tep, and Tp-Tr is less than or equal to T2. Wherein T2 is the second temperature threshold.

Optionally, T1 < T2, and the T1, T2 are determined according to the Tp.

Optionally, determining T1, T2 from Tp includes: and determining T1 and T2 corresponding to Tp according to a preset corresponding relation.

Optionally, analyzing the condition of the refrigerant cycle according to Tr, tp and the current state of the compressor, further comprising: and if Tp meets the condition of starting the defrosting operation, and Tp-Tr is more than T1, starting the defrosting operation by the compressor, and | Tr-Tp | is more than T1 in the defrosting operation, judging that the refrigerant circulation is normal.

Optionally, analyzing the condition of the refrigerant cycle according To Tr, tp, to and the current state of the compressor includes: and if Tr, tp and To meet the condition of starting defrosting operation, tp-Tr is less than or equal To T3, the compressor starts defrosting operation, and | Tr-Tp | is less than or equal To T3 in defrosting operation, the refrigerant circulation is judged To be abnormal. Wherein T3 is a third temperature threshold.

Optionally, analyzing the condition of the refrigerant cycle according To Tr, tp, to and the current state of the compressor includes: and if Tr, tp and To meet the condition of starting the defrosting operation, tp-Tr is less than or equal To T3, the compressor does not start the defrosting operation, and the current outdoor coil temperature is equal To the initial outdoor coil temperature, the refrigerant circulation is judged To be abnormal.

Optionally, analyzing the condition of the refrigerant cycle according To Tr, tp, to and the current state of the compressor includes: and if Tr, tp and To meet the conditions of overheat protection or temperature-reaching shutdown of the compressor, and the compressor is not in the overheat protection state or the temperature-reaching shutdown state, determining that the refrigerant circulation is abnormal.

Alternatively, tr, tp, and To satisfy the condition for starting the defrosting operation, including: tr is more than T4, and T5 is more than or equal To and is less than T6. Wherein T4 is a fourth temperature threshold, T5 is a fifth temperature threshold, and T6 is a sixth temperature threshold.

Alternatively, tr, tp, and To satisfy conditions for compressor over-temperature protection or warm-up shutdown, including: tr is more than T4, to is more than or equal To T6, and Tp-Tr is less than or equal To T7. Wherein T7 is a seventh temperature threshold.

Optionally, T3 < T7, and said T3, T7 are determined from said To.

Optionally, determining T3, T7 according To the To includes: and determining T3 and T7 corresponding To according To the preset corresponding relation.

Optionally, analyzing the condition of the refrigerant cycle according To Tr, tp, to and the current state of the compressor, further comprising: and if Tr, tp and To meet the condition of starting the defrosting operation, tr-Tp is more than T3, the compressor starts the defrosting operation, and | Tr-Tp | is more than T3 in the defrosting operation, the refrigerant circulation is judged To be normal.

Optionally, analyzing the condition of the refrigerant cycle according To Tr, tp, to and the current state of the compressor, further comprising: and if Tr, tp and To meet the condition of starting defrosting operation, tr-Tp is greater than T3, the compressor does not start defrosting operation, and the current outdoor coil temperature is not equal To the initial coil temperature, the refrigerant circulation is judged To be normal.

Optionally, in a case that the refrigerant cycle is abnormal, the method further includes: controlling the compressor to stop; controlling the outer fan to stop; and controlling the inner fan to keep running.

Optionally, after controlling the compressor to stop, the method further includes: controlling the compressor to restart under the condition that the accumulated number of times of stopping the compressor is less than a preset value; and keeping the compressor in a stop state under the condition that the accumulated stop times of the compressor is greater than or equal to a preset value.

In some embodiments, the device is applied to the heating operation condition of the air conditioner, and comprises: a processor and a memory storing program instructions, the processor being configured to execute the method for detecting refrigerant anomalies as described above when executing the program instructions.

In some embodiments, the air conditioner includes a compressor, a heat exchanger, and a device for detecting refrigerant abnormality as described above.

In some embodiments, the storage medium stores program instructions that, when executed, perform the method for detecting refrigerant anomaly as described above.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic view of an air conditioner;

fig. 2 is a schematic diagram illustrating a method for detecting refrigerant anomaly according to an embodiment of the disclosure;

fig. 3 is a schematic diagram of another method for detecting refrigerant abnormality according to an embodiment of the disclosure;

fig. 4 is a schematic diagram of another method for detecting refrigerant abnormality according to an embodiment of the disclosure;

fig. 5 is a schematic diagram illustrating another method for detecting refrigerant anomaly according to an embodiment of the disclosure;

fig. 6 is a schematic diagram of another method for detecting refrigerant abnormality according to an embodiment of the disclosure;

fig. 7 is a schematic diagram of another method for detecting refrigerant abnormality according to an embodiment of the disclosure;

fig. 8 is a schematic diagram of an apparatus for detecting refrigerant abnormality according to an embodiment of the present disclosure.

Detailed Description

So that the manner in which the features and advantages of the embodiments of the present disclosure can be understood in detail, a more particular description of the embodiments of the disclosure, briefly summarized above, may be had by reference to the appended drawings, which are included to illustrate, but are not intended to limit the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and claims of the embodiments of the disclosure and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more, unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

The term "correspond" may refer to an association or binding relationship, and a corresponds to B refers to an association or binding relationship between a and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

At present, the refrigerant abnormity of the air conditioner is the most prominent and common problem in after-sale feedback, the system operation can be in an abnormal state after the refrigerant abnormity of the air conditioner, and the heating effect of the air conditioner can be directly influenced by the refrigerant abnormity of the air conditioner, so that the refrigerant abnormity detection is very necessary in the operation process of the air conditioner. In order to solve the problem of the requirement for refrigerant abnormity detection in the heating operation working condition of the air conditioner, the related technology discloses a method for judging the insufficient refrigerant of an air conditioner system and the air conditioner, and the method comprises the following steps: through the scheme of temperature difference between the inner coil and the inner environment, the temperature of the outer environment, control of the inner wind speed and repeated multiple judgment during heating, the characteristic of insufficient refrigerant can be effectively embodied and accurately judged in each use scene of the system, and abnormal faults can be fed back in time. However, in the related art, when the refrigerant abnormality under the heating operation condition is detected, the influence on the refrigerant abnormality detection result under the heating operation condition is not considered when the air conditioner is different in model and the current indoor coil temperature range, the current outdoor environment temperature range is different, and the state of the compressor is different, the detection method is insensitive, misjudgment is easy to occur, and the refrigerant abnormality detection accuracy is low.

As shown in fig. 1, an air conditioner generally includes a circulation loop. Wherein, the circulation loop comprises a compressor 11, an outdoor heat exchanger 12, a throttling device 13, an indoor heat exchanger 14 and a four-way valve 15. The air conditioner further includes an electronic control device (not shown) for controlling the operation of the circulation loop, the electronic control device including a processor. The processor is used for controlling the compressor, adjusting the throttling device 13 and other electric control components, thereby realizing various functions of the air conditioner.

The embodiment of the disclosure provides a method and a device for detecting refrigerant abnormity, an air conditioner and a storage medium, so as to improve the accuracy of refrigerant abnormity detection under the heating operation condition.

In the air conditioner described with reference to fig. 1, an embodiment of the present disclosure provides a method for detecting refrigerant abnormality. The method is applied to a fixed-frequency type air conditioner. As shown in fig. 2, the method includes:

s201, the processor detects the current indoor environment temperature Tr and the current indoor coil temperature Tp under the condition that the continuous operation time of the compressor is longer than or equal to the preset time.

Wherein, tr and Tp can be detected by a plurality of temperature sensors arranged on the air conditioner.

The temperature sensor for detecting the Tr is arranged at the position of the air inlet of the indoor unit of the air conditioner, so that the Tr obtained by detection is more accurate. The temperature sensor for detecting Tp is arranged at the position of the coil pipe of the indoor unit of the air conditioner, and the real-time temperature detected by the temperature sensor is taken as Tp.

When the continuous operation time of the compressor is longer than or equal to the preset time, the air conditioner starts to heat for a period of time, and the air conditioner enters a stable state. The temperature sensor also enters a stable operation state, and the detected Tr and Tp are relatively stable. Alternatively, if the preset time period is greater than or equal to 20 minutes (min), the detected Tr and Tp are more stable and reliable.

S202, the processor analyzes the condition of the refrigerant circulation according to Tr, tp and the current state of the compressor.

Under the condition that the air conditioner is a fixed-frequency type and is in heating operation, the processor can accurately analyze the refrigerant circulation condition according to the temperature abnormal conditions expressed by Tp and Tr under the condition and the current state of the compressor.

And S203, when the refrigerant circulation is abnormal, the processor outputs prompt information of the refrigerant circulation abnormality.

In the above embodiment, when the continuous operation time of the compressor is longer than or equal to the preset time, the logic analysis is performed on the air conditioner of the fixed-frequency type. And judging the heat exchange quantity of the current air conditioner according to Tr and Tp, and eliminating misjudgment possibly occurring in the detection process by combining the current state of the compressor. The detection method is sensitive and reliable, can reduce the probability of misjudgment, and improves the accuracy of refrigerant abnormity detection in the heating operation working condition.

Optionally, the outputting, by the processor, the prompt message of the abnormal refrigerant circulation includes: and the abnormal circulation of the refrigerant is prompted through an indicator lamp. For example, the indicator lights flash, or the indicator lights show a particular color.

Optionally, the outputting, by the processor, the prompt message of the abnormal refrigerant circulation includes: prompting and displaying the preset time of the fault code of the refrigerant circulation abnormity through a display screen; or the display screen directly displays the refrigerant abnormal preset time. And recording the fault information to the memory after prompting the information. More specifically, the preset time is 3min to 6min. Therefore, the judgment result is more stable, and meanwhile, the information of the refrigerant circulation abnormity can be timely and intuitively fed back to the user.

Optionally, the processor analyzes the condition of the refrigerant cycle according to Tr, tp and the current state of the compressor, and comprises: and if Tp meets the condition of starting the defrosting operation, and Tp-Tr is less than or equal to T1, starting the defrosting operation by the compressor, and | Tr-Tp | is less than or equal to T1 in the defrosting operation, judging that the refrigerant circulation is abnormal.

Wherein T1 is a first temperature threshold. It should be noted that T1 should not be set too large or too small. Alternatively, T1 may be, but is not limited to, between 2 ℃ and 4 ℃. More specifically, T1 is 2 ℃,3 ℃ or 4 ℃. If T1 is set too large, the difference between Tp and Tr and the absolute value of the difference may be less than or equal to T1, but at this time, it cannot be said that the heat exchange amount of the air conditioner is low currently. In this case, the air conditioner may not have a refrigerant circulation abnormality, and erroneous determination may easily occur. If T1 is set too small, it is difficult to detect a difference between Tp and Tr, that is, it is difficult to detect a refrigerant circulation abnormality. Therefore, the refrigerant circulation abnormity detection can be well realized by setting the T1 in the temperature interval, no misjudgment can be caused, and no detection omission can be caused when the refrigerant circulation is abnormal, so that the accuracy of the refrigerant circulation abnormity detection result is ensured.

If the refrigerant circulation is normal, the difference between Tp and Tr is larger when the condition of starting defrosting operation is met under the heating operation working condition of the air conditioner. In addition, the compressor may be subject to starting defrost. In the case where defrosting is started, the absolute value of the difference between Tp and Tr is large at the time of defrosting operation.

When the condition of starting defrosting operation is met under the heating operation working condition of the air conditioner, if the difference value between Tp and Tr is small, the compressor starts defrosting, and the absolute value of the difference value between Tp and Tr is small during defrosting operation, the condition that the refrigerant circulation of the air conditioner is abnormal can be judged.

Optionally, analyzing the condition of the refrigerant cycle according to Tr, tp and the current state of the compressor includes: and if Tr and Tp meet the conditions of overheat protection or temperature-reaching shutdown of the compressor, and the compressor is not in the overheat protection state or the temperature-reaching shutdown state, judging that the refrigerant circulation is abnormal.

If the refrigerant circulation is normal, the compressor is in an overheat protection state or a temperature-reaching shutdown state when the condition of overheat protection or temperature-reaching shutdown of the compressor is met under the heating operation working condition of the air conditioner.

When the condition of overheat protection or temperature-reaching shutdown of the compressor is met under the heating operation working condition of the air conditioner, if the compressor is not in the state of overheat protection or temperature-reaching shutdown, the occurrence of refrigerant circulation abnormity of the air conditioner can be judged.

Optionally, tp satisfies conditions for initiating defrost operation, including: tp is less than Tep.

Wherein Tep is the coil temperature threshold. More specifically, tep is more than or equal to 30 ℃ and less than or equal to 40 ℃. Therefore, the current state of the compressor is judged more accurately according to the Tep.

Under the heating operation condition of the air conditioner, when Tp is less than Tep, the Tp is low. When Tp is low, it can be judged that the condition for starting the defrosting operation is satisfied at this time.

Alternatively, tr, tp satisfy conditions for compressor over-temperature protection or warm-up shutdown, including: tp is more than or equal to Tep, and Tp-Tr is less than or equal to T2. Wherein Tep is the coil temperature threshold.

Wherein T2 is the second temperature threshold. Note that T2 should not be set too large or too small. Alternatively, T2 may be, but is not limited to, between 5 ℃ and 7 ℃. More specifically, T2 is 5 ℃, 6 ℃ or 7 ℃. If T1 is set too large, the difference between Tp and Tr may be smaller than or equal to T2, but it cannot be said that the heat exchange amount of the current air conditioner is low. In this case, the air conditioner may not have a refrigerant circulation abnormality, and erroneous determination may easily occur. If T2 is set too small, it is difficult to detect a difference between Tp and Tr, that is, it is difficult to detect a refrigerant circulation abnormality. Therefore, the T2 is set in the temperature interval, refrigerant circulation abnormity detection can be well realized, misjudgment can not occur, detection omission can not occur when the refrigerant circulation is abnormal, and the accuracy of the refrigerant circulation abnormity detection result is ensured.

Under the heating operation condition of the air conditioner, when Tp is more than or equal to Tep, the Tp is higher. When Tp is high and the difference between Tp and Tr is small, the current heat exchange effect of the air conditioner is poor. And then the condition that the compressor is possibly overheat-protected or shutdown at the temperature can be judged.

Optionally, T1 < T2, and the T1, T2 are determined according to the Tp.

When Tp is in different temperature intervals, the difference between Tp and Tr is different. The higher Tp indicates that the heat exchange effect of the air conditioner under the heating operation condition is better, and the larger the difference value between Tp and Tr is. And the values of T1 and T2 are determined according to Tp, and when Tp is in different temperature ranges, T1 and T2 are set respectively, so that the detection result is more accurate and sensitive.

Optionally, the processor determines T1, T2 from the Tp, including: and determining T1 and T2 corresponding to Tp according to a preset corresponding relation.

More specifically, an optional correspondence between Tp and T1 is shown in table 1. An alternative correspondence between Tp and T2 is shown in table 2.

TABLE 1

Tp(℃)	T1(℃)
		28≤Tp＜30	4
26≤Tp＜28	3
		24≤Tp＜26	2

TABLE 2

Tp(℃)	T2(℃)
		34≤Tp＜36	7
32≤Tp＜34	6
		30≤Tp＜32	5

When the condition of starting defrosting operation is met under the heating operation working condition of the air conditioner, if the difference value between Tp and Tr is large, the compressor starts defrosting, and the absolute value of the difference value between Tp and Tr is also large during defrosting operation, which indicates that the current air conditioner is high in heat exchange amount and good in heat exchange effect, the normal circulation of the refrigerant of the air conditioner can be judged.

Referring to fig. 3, another method for detecting refrigerant abnormality is provided in the embodiments of the present disclosure. The method is applied to a fixed-frequency type air conditioner and comprises the following steps:

s301, the processor detects the current indoor environment temperature Tr and the current indoor coil temperature Tp under the condition that the continuous operation time of the compressor is longer than or equal to the preset time.

S302, the processor analyzes the condition of the refrigerant circulation according to Tr, tp and the current state of the compressor.

And S303, under the condition that the refrigerant circulation is abnormal, the processor outputs prompt information of the refrigerant circulation abnormality.

S304, the processor controls the compressor to stop; the processor controls the external fan to stop; the processor controls the inner fan to keep running.

Under the condition that the refrigerant circulation is judged to be abnormal, the processor controls the compressor to stop and the external fan to stop, so that the air conditioner can be ensured to operate in a stable and safe environment, and the problem of refrigerant circulation abnormity caused by continuous flow of the refrigerant is avoided to be more serious. For example, under the condition of refrigerant leakage, the compressor and the external fan are controlled to stop, so that the environment pollution caused by the refrigerant leakage can be avoided, and the energy is saved. The processor controls and keeps the inner fan to operate, so that the air conditioner can keep the heating effect through the operation of the inner fan under the condition that the compressor and the outer fan are stopped. Therefore, the problem that the user experience is influenced by the fact that the indoor heating effect is greatly influenced by the abnormal condition of refrigerant circulation is avoided.

S305, after the compressor is controlled to stop, the processor judges whether the stop frequency accumulation of the compressor is less than a preset value. If yes, entering S306; if not, the process proceeds to S307.

And S306, controlling the compressor to restart to operate by the processor.

S307, the processor keeps the compressor in a shutdown state.

In order to further confirm that the air conditioner has refrigerant circulation abnormity, the air conditioner can be started again to repeatedly carry out the judgment until the accumulated number of times of stopping the compressor is greater than or equal to the preset value. The number of times of refrigerant cycle abnormality is determined to be large based on the above conditions, indicating that the refrigerant cycle abnormality is likely to occur. Therefore, the refrigerant circulation abnormity is detected for multiple times, and the detection result is more accurate and reliable. When the detection result confirms that the refrigerant circulation is abnormal, the compressor should be kept stopped, and the problem of refrigerant circulation abnormality caused by continuous flow of the refrigerant is avoided to be more serious. And after the information is prompted, the fault information is recorded in a memory, so that after-sale maintenance is facilitated.

More specifically, the preset value can be set according to actual requirements, and when the refrigerant cycle abnormality detection requirement is strict, the preset value can be set to 3 times, 2 times or less; when the requirement for detecting the abnormal refrigerant circulation is not particularly strict, the preset value can be set to 4 times, 5 times or more, and when the abnormal refrigerant circulation occurs for many times, the compressor is kept in a stop state.

Referring to fig. 4, another method for detecting refrigerant abnormality is provided in the embodiments of the present disclosure. The method is applied to a fixed-frequency type air conditioner and comprises the following steps:

s401, the processor detects the current indoor environment temperature Tr and the current indoor coil temperature Tp under the condition that the continuous operation time of the compressor is more than or equal to 20 min.

S402, the processor analyzes the condition of the refrigerant circulation according to the Tr, the Tp and the current state of the compressor.

And S403, tp is less than 30 ℃, tp-Tr is less than or equal to 3 ℃, the compressor starts defrosting operation, and | Tr-Tp | is less than or equal to 3 ℃ during defrosting operation, and the processor judges that the refrigerant circulation is abnormal.

S404, tp is more than or equal to 30 ℃, tp-Tr is less than or equal to 5 ℃, the compressor is not in an overheat protection state or in a temperature-reaching shutdown state, and the processor judges that the refrigerant circulation is abnormal.

And S405, outputting prompt information of the abnormal refrigerant circulation by the processor under the condition of the abnormal refrigerant circulation.

S406, the processor controls the compressor to stop; the processor controls the external fan to stop; the processor controls the inner fan to keep running.

And S407, after the compressor is controlled to stop, judging whether the stop times of the compressor are accumulated to be less than 3 times by the processor. If yes, entering S408; if not, the process proceeds to S409.

And S408, controlling the compressor to restart to operate by the processor.

S409, the processor keeps the compressor in a stop state.

In the above embodiment, when the continuous operation time of the compressor is longer than or equal to 20min, the detected Tr and Tp are more stable and accurate, and the detection result of the refrigerant abnormality of the fixed-frequency type air conditioner is more accurate.

And judging whether the compressor starts defrosting operation or not according to the Tp of less than 30 ℃. And judging that the heat exchange effect of the current air conditioner is poor according to the condition that Tp-Tr is less than or equal to 3 ℃ and | Tr-Tp is less than or equal to 3 ℃ in the defrosting operation, and further judging that the refrigerant circulation is abnormal. And judging that the compressor is possibly in an overheat protection state or a temperature-reaching shutdown state according to the condition that Tp is more than or equal to 30 ℃ and Tp-Tr is less than or equal to 5 ℃. Under the condition that the compressor is possibly in an overheating protection state or a temperature-reaching shutdown state, the compressor is not in the overheating protection state or the temperature-reaching shutdown state, and then the refrigerant circulation abnormity can be judged. The embodiment eliminates the possible misjudgment condition in the detection process.

In addition, whether the stop times of the compressor are less than 3 times is judged, and the purpose is to further confirm the abnormal refrigerant circulation of the air conditioner. The above determination is repeated again in the case of less than 3 times until the cumulative number of compressor stops is greater than or equal to 3 times. The method is sensitive and reliable, can reduce the probability of misjudgment and improve the accuracy of refrigerant abnormity detection in the heating operation working condition.

In conjunction with the air conditioner described in fig. 1, another method for detecting refrigerant abnormality is provided in the embodiments of the present disclosure. The method is applied to the inverter type air conditioner. As shown in fig. 5, the method includes:

s501, the processor detects the current indoor environment temperature Tr, the current indoor coil temperature Tp and the current outdoor environment temperature To when the continuous operation time of the compressor is longer than or equal To the preset time.

The temperature sensor for detecting To is arranged outside the outdoor heat exchanger of the air conditioner To detect the current outdoor environment temperature in real time.

S502, the processor analyzes the condition of the refrigerant circulation according To Tr, tp and To and the current state of the compressor.

Under the condition that the air conditioner is of an inverter type and is in heating operation, the processor can accurately analyze the refrigerant circulation condition according To the temperature abnormal conditions expressed by Tp and Tr under the condition and the current state of the compressor analyzed according To Tr and To.

And S503, when the refrigerant circulation is abnormal, the processor outputs prompt information of the refrigerant circulation abnormality.

In the above embodiment, when the continuous operation time period of the compressor is longer than or equal to the preset time period, the logic analysis is performed on the inverter type air conditioner. And judging the current heat exchange amount of the air conditioner according To Tr and Tp, and judging the current state of the compressor according To Tr and To. And the misjudgment condition possibly occurring in the detection process is eliminated through the combination judgment of the heat exchange quantity and the current state of the compressor. The detection method is sensitive and reliable, can reduce the probability of misjudgment, and improves the accuracy of refrigerant abnormity detection in the heating operation working condition.

Optionally, analyzing the condition of the refrigerant cycle according To Tr, tp, to and the current state of the compressor includes: and if Tr, tp and To meet the condition of starting the defrosting operation, and Tp-Tr is less than or equal To T3, starting the defrosting operation by the compressor, and | Tr-Tp | is less than or equal To T3 in the defrosting operation, judging that the refrigerant circulation is abnormal.

Wherein T3 is a third temperature threshold. It should be noted that T3 should not be set too large or too small. Alternatively, T3 may be, but is not limited to, between 2 ℃ and 4 ℃. More specifically, T2 is 2 ℃,3 ℃ or 4 ℃. If T3 is set too large, the difference between Tp and Tr and the absolute value of the difference may be less than or equal to T3, but at this time, it cannot be said that the heat exchange amount of the air conditioner is low currently. In this case, the air conditioner may not have a refrigerant circulation abnormality, and erroneous determination may easily occur. If T3 is set too small, it becomes difficult to detect a difference between Tp and Tr, that is, it becomes difficult to detect a refrigerant circulation abnormality. Therefore, the T3 is set in the temperature interval, refrigerant circulation abnormity detection can be well realized, misjudgment can not occur, detection omission can not occur when the refrigerant circulation is abnormal, and the accuracy of the refrigerant circulation abnormity detection result is ensured.

When the condition of starting defrosting operation is met under the heating operation working condition of the air conditioner, if the difference value between Tp and Tr is small, the compressor starts defrosting, and the absolute value of the difference value between Tp and Tr is small during defrosting operation, the air conditioner can be judged to have refrigerant circulation abnormity.

If the refrigerant circulation is normal, the difference between Tp and Tr is larger when the condition of starting defrosting operation is met under the heating operation working condition of the air conditioner. In addition, the compressor may not be defrost activated. In the event that defrost is not initiated, the current outdoor coil temperature is not equal to the initial outdoor coil temperature.

When the condition of starting defrosting operation is met under the heating operation working condition of the air conditioner, if the difference value of Tp and Tr is small, the compressor does not start defrosting operation, and the current outdoor coil temperature is equal to the initial outdoor coil temperature, the condition that the air conditioner has refrigerant circulation abnormity can be judged. When the air conditioner is a frequency converter type, the temperature of the current outdoor coil pipe is more stable. Therefore, the current outdoor coil temperature and the initial outdoor coil temperature are selected for judgment, and the judgment result can be more accurate.

If the refrigerant circulation is normal, the compressor is in the state of overheat protection or temperature-reaching shutdown when the condition of overheat protection or temperature-reaching shutdown of the compressor is met under the heating operation working condition of the air conditioner.

Alternatively, tr, tp, and To satisfy the condition for starting the defrosting operation, including: tr is more than T4, and T5 is more than or equal To and is less than T6.

Wherein T4 is a fourth temperature threshold. It should be noted that the setting of T4 should not be too low. Alternatively, T4. Gtoreq.5 ℃. More particularly, T4 is 5 ℃, 6 ℃ or 7 ℃. If T4 is set to less than 5 c, for example, if T4 is set to 4 c, the determination of the current state of the compressor may be affected. Therefore, the T4 is set to be more than or equal to 5 ℃, so that the detection in the temperature range can be more accurate.

T5 is a fifth temperature threshold, and T6 is a sixth temperature threshold. Optionally, T5 is more than or equal to-5 ℃ and T6 is more than or equal to 10 ℃. More specifically, T5 is-5 ℃, -4 ℃ or-3 ℃; t6 is 10 ℃, 11 ℃ or 12 ℃. When To is in the range of-5 ℃ To 10 ℃, whether the compressor enters a defrosting state can be judged more intuitively.

Under the heating operation condition, when Tr is greater than T4 and To is low, the condition of starting defrosting operation can be judged To be met.

Alternatively, tr, tp, and To satisfy conditions for compressor over-temperature protection or warm-up shutdown, including: tr is more than T4, to is more than or equal To T6, and Tp-Tr is less than or equal To T7.

Wherein T7 is a seventh temperature threshold. Note that T7 should not be set too large or too small. Alternatively, T7 may be, but is not limited to, between 5 ℃ and 7 ℃. More specifically, T2 is 5 ℃, 6 ℃ or 7 ℃. If T7 is set too large, the difference between Tp and Tr may be less than or equal to T7, but at this time, it cannot be said that the heat exchange amount of the air conditioner is low currently. In this case, the air conditioner may not have a refrigerant circulation abnormality, and erroneous determination may easily occur. If T7 is set too small, it is difficult to detect a difference between Tp and Tr, that is, it is difficult to detect a refrigerant circulation abnormality. Therefore, by setting T7 in the temperature range, refrigerant circulation abnormality detection can be realized well, and detection omission does not occur either when refrigerant circulation is abnormal or when refrigerant circulation is abnormal, thereby ensuring the accuracy of the refrigerant circulation abnormality detection result.

Under the heating operation condition, when Tr is larger than T4, to is higher, and the difference value between Tp and Tr is smaller, the air conditioner shows that the heat exchange effect generated by the air conditioner at present is poor. And then the compressor can be judged to be possibly in the state of overheat protection or warm shutdown.

Optionally, T3 < T7, and said T3, T7 are determined from said To.

When To is in different temperature intervals, the difference between Tp and Tr is different. The higher To indicates that the heat exchange effect of the air conditioner under the heating operation working condition is better, and the larger the difference value between Tp and Tr is. And determining the values of T3 and T7 according To, and respectively setting T3 and T7 when To is in different temperature ranges, so that the detection result is more accurate and sensitive.

Optionally, the processor determines T3, T7 according To the To, including: and the processor determines T3 and T7 corresponding To according To the preset corresponding relation.

More specifically, an optional correspondence relationship between To and T3 is shown in table 3. An alternative correspondence between To and T7 is shown in table 4.

TABLE 3

To(℃)	T3(℃)
		5≤To＜10	4
0≤To＜5	3
		-5≤To＜0	2

TABLE 4

To(℃)	T7(℃)
		30≤To＜25	7
20≤To＜15	6
		15≤To＜10	5

When the condition of starting defrosting operation is met under the heating operation working condition of the air conditioner, if the difference value of Tp and Tr is large, the compressor starts defrosting, and the absolute value of the difference value of Tp and Tr is also large during defrosting operation, which indicates that the heat exchange quantity of the current air conditioner is high and the heat exchange effect is good, the normal circulation of the refrigerant of the air conditioner can be judged.

Optionally, analyzing the condition of the refrigerant cycle according To Tr, tp, to and the current state of the compressor, further comprising: and if Tr, tp and To meet the condition of starting defrosting operation, tr-Tp is more than T3, the compressor does not start defrosting operation, and the current outdoor coil temperature is not equal To the initial outdoor coil temperature, the refrigerant circulation is judged To be normal.

When the condition of starting defrosting operation is met under the heating operation working condition of the air conditioner, if the difference value of Tp and Tr is large, the compressor does not start defrosting, and the current outdoor coil temperature is not equal to the initial outdoor coil temperature, the heat exchange quantity of the current air conditioner is high, the heat exchange effect is good, and the condition that the refrigerant circulation of the air conditioner is normal can be judged.

Referring to fig. 6, another method for detecting refrigerant abnormality is provided in the embodiments of the present disclosure. The method is applied to an inverter type air conditioner and comprises the following steps:

s601, the processor detects the current indoor environment temperature Tr, the current indoor coil temperature Tp and the current outdoor environment temperature To when the continuous operation time of the compressor is longer than or equal To the preset time.

S602, the processor analyzes the condition of the refrigerant circulation according To Tr, tp and To and the current state of the compressor.

And S603, outputting prompt information of the abnormal refrigerant circulation by the processor under the condition of the abnormal refrigerant circulation.

S604, the processor controls the compressor to stop; the processor controls the external fan to stop; the processor controls the inner fan to keep running.

And S605, after the compressor is controlled to stop, the processor judges whether the stop frequency accumulation of the compressor is less than a preset value. If yes, entering S606; if not, the process proceeds to S607.

And S606, controlling the compressor to restart to operate by the processor.

S607, the processor maintains the compressor in a shutdown state.

In order to further confirm that the air conditioner has refrigerant circulation abnormity, the air conditioner can be started again to repeatedly carry out the judgment until the accumulated number of times of stopping the compressor is greater than or equal to the preset value. The refrigerant circulation abnormality is determined to be more frequently according to the above conditions, which indicates that the refrigerant circulation abnormality is more likely. Therefore, the refrigerant circulation abnormity is detected for multiple times, and the detection result is more accurate and reliable. When the detection result confirms that the refrigerant circulation is abnormal, the compressor should be kept stopped, and the problem of refrigerant circulation abnormality caused by continuous flow of the refrigerant is avoided to be more serious. And after the information is prompted, the fault information is recorded in a memory, so that after-sale maintenance is facilitated.

More specifically, the preset value can be set according to actual requirements, and when the refrigerant circulation abnormity detection requirement is strict, the preset value can be set to 3 times, 2 times or less; when the requirement for detecting the abnormal refrigerant circulation is not particularly strict, the preset value can be set to 4 times, 5 times or more, and when the abnormal refrigerant circulation occurs for many times, the compressor is kept in a stop state.

Referring to fig. 7, another method for detecting refrigerant abnormality is provided in the embodiments of the present disclosure. The method is applied to an inverter type air conditioner and comprises the following steps:

s701, under the condition that the continuous operation time of the compressor is longer than or equal To 20min, the processor detects the current indoor environment temperature Tr, the current indoor coil temperature Tp and the current outdoor environment temperature To.

S702, the processor analyzes the condition of the refrigerant circulation according To Tr, tp and To and the current state of the compressor.

S703, tr is more than 5 ℃, to is more than or equal To minus 5 ℃ and less than 10 ℃, tp-Tr is less than or equal To 3 ℃, the compressor starts defrosting operation, and | Tr-Tp | is less than or equal To 3 ℃ in defrosting operation, and the processor judges that refrigerant circulation is abnormal.

And S704, wherein Tr is more than 5 ℃, to is more than or equal To-5 ℃ and less than 10 ℃, tp-Tr is less than or equal To 3 ℃, the compressor does not start defrosting operation, the current outdoor coil temperature is equal To the initial outdoor coil temperature, and the processor judges that the refrigerant circulation is abnormal.

S705, tr is more than 5 ℃, to is more than or equal To 10 ℃, tp-Tr is less than or equal To 5 ℃, the compressor is not in overheat protection or in a temperature-reaching shutdown state, and the processor judges that the refrigerant circulation is abnormal.

And S706, under the condition that the refrigerant circulation is abnormal, the processor outputs prompt information of the refrigerant circulation abnormality.

S707, the processor controls the compressor to stop; the processor controls the external fan to stop; the processor controls the inner fan to keep running.

And S708, after the compressor is controlled to stop, the processor judges whether the stop times of the compressor are accumulated to be less than 3 times. If yes, go to S709; if not, the process proceeds to S710.

And S709, controlling the compressor to restart by the processor.

S710, the processor keeps the compressor in a stop state.

In the above embodiment, when the continuous operation time of the compressor is longer than or equal To 20min, the detected Tr, tp and To are more stable and accurate, and the detection result of the refrigerant abnormality of the inverter type air conditioner is more accurate.

Judging whether the compressor starts defrosting operation or not according To the conditions that Tr is more than 5 ℃, and To is more than or equal To minus 5 ℃ and less than 10 ℃. Under the condition of starting defrosting, judging that the heat exchange effect of the current air conditioner is poor according to the condition that Tp-Tr is less than or equal to 3 ℃ and | Tr-Tp | is less than or equal to 3 ℃ during defrosting operation, and further judging that the refrigerant circulation is abnormal. And under the condition that defrosting is not started, judging that the heat exchange effect of the current air conditioner is poor according to the condition that Tp-Tr is less than or equal to 3 ℃ and the current outdoor coil temperature is equal to the initial outdoor coil temperature, and further judging that the refrigerant circulation is abnormal. And judging that the compressor is possibly in an overheat protection state or a temperature-reaching shutdown state according To the conditions that Tr is more than 5 ℃, to is more than or equal To 10 ℃, and Tp-Tr is less than or equal To 5 ℃. Under the condition that the compressor is possibly in an overheating protection state or a temperature-reaching shutdown state, the compressor is not in the overheating protection state or the temperature-reaching shutdown state, and then the refrigerant circulation abnormity can be judged. The embodiment eliminates the possibility of misjudgment in the detection process.

In addition, whether the number of times of stopping the compressor is less than 3 times is judged, and the purpose is to further confirm the abnormal refrigerant circulation of the air conditioner. The above determination is repeated again in the case of less than 3 times until the cumulative number of compressor stops is greater than or equal to 3 times. The method is sensitive and reliable, can reduce the probability of misjudgment, and improves the accuracy of refrigerant abnormity detection in the heating operation working condition.

With reference to fig. 8, an apparatus for detecting refrigerant anomaly according to an embodiment of the present disclosure includes a processor (processor) 800 and a memory (memory) 801. Optionally, the device for detecting refrigerant abnormality may further include a Communication Interface (Communication Interface) 802 and a bus 803. The processor 800, the communication interface 802, and the memory 801 may communicate with each other via a bus 803. Communication interface 802 may be used for the transfer of information. The processor 800 may call logic instructions in the memory 801 to execute the method for detecting refrigerant abnormality according to the above embodiment.

In addition, the logic instructions in the memory 801 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as a stand-alone product.

The memory 801 is used as a storage medium for storing software programs, computer executable programs, and program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 800 executes functional applications and data processing by executing program instructions/modules stored in the memory 801, that is, implements the method for detecting refrigerant abnormality in the above embodiments.

The memory 801 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 801 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides an air conditioner, which comprises the device for detecting the refrigerant abnormity.

The embodiment of the disclosure provides a storage medium, which stores computer-executable instructions configured to execute the method for detecting refrigerant abnormality.

The storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium. A non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description for example only and are not limiting upon the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising a" \8230; "does not exclude the presence of additional like elements in a process, method or apparatus comprising the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. A method for detecting refrigerant abnormity is applied to the heating operation working condition of an air conditioner, and is characterized by comprising the following steps:

under the condition that the continuous operation time length of the compressor is greater than or equal To the preset time length, detecting the current indoor environment temperature Tr, the current indoor coil temperature Tp and the current outdoor environment temperature To;

under the condition that the air conditioner is a fixed-frequency type, analyzing the refrigerant circulation condition according to Tr, tp and the current state of the compressor; or, under the condition that the air conditioner is an inverter type, analyzing the condition of refrigerant circulation according To Tr, tp and To and the current state of the compressor;

and outputting prompt information of the abnormal refrigerant circulation under the condition of the abnormal refrigerant circulation.

2. The method of claim 1, wherein analyzing the refrigerant cycle based on Tr, tp and the current state of the compressor comprises:

if Tp meets the condition of starting defrosting operation, and Tp-Tr is less than or equal to T1, and the compressor starts defrosting operation, and | Tr-Tp | is less than or equal to T1 in defrosting operation, the refrigerant circulation is judged to be abnormal; and/or the presence of a gas in the gas,

if Tr and Tp meet the conditions of overheat protection or temperature-reaching shutdown of the compressor, and the compressor is not in overheat protection or temperature-reaching shutdown state, determining that the refrigerant circulation is abnormal;

wherein T1 is a first temperature threshold.

3. The method of claim 2 wherein Tp satisfies conditions for initiating defrost operation, including:

Tp＜Tep；

wherein Tep is the coil temperature threshold.

4. The method of claim 2, wherein Tr, tp satisfies conditions for compressor over-temperature protection or warm-up shutdown, including:

tp is more than or equal to Tep, and Tp-Tr is less than or equal to T2;

wherein Tep is the coil temperature threshold and T2 is the second temperature threshold.

5. The method of claim 1, wherein analyzing the refrigerant cycle based on Tr, tp, to and the current state of the compressor comprises:

if Tr, tp and To meet the condition of starting defrosting operation, and Tp-Tr is less than or equal To T3, starting defrosting operation by the compressor, and | Tr-Tp | is less than or equal To T3 in defrosting operation, judging that the refrigerant circulation is abnormal; and/or the presence of a gas in the atmosphere,

if Tr, tp and To meet the condition of starting defrosting operation, tp-Tr is less than or equal To T3, the compressor does not start defrosting operation, and the current outdoor coil temperature is equal To the initial outdoor coil temperature, the refrigerant circulation is judged To be abnormal; and/or the presence of a gas in the atmosphere,

if Tr, tp and To meet the conditions of overheat protection or temperature-reaching shutdown of the compressor, and the compressor is not in the overheat protection state or the temperature-reaching shutdown state, determining that the refrigerant circulation is abnormal;

wherein T3 is a third temperature threshold.

6. The method of claim 5 wherein Tr, tp and To satisfy conditions for initiating defrost operation include:

tr is more than T4, and T5 is more than or equal To T and is less than T6;

wherein T4 is a fourth temperature threshold, T5 is a fifth temperature threshold, and T6 is a sixth temperature threshold.

7. The method of claim 5, wherein Tr, tp, and To satisfy conditions for compressor over-temperature protection or warm-up shutdown, including:

tr is more than T4, to is more than or equal To T6, and Tp-Tr is less than or equal To T7;

wherein T4 is a fourth temperature threshold, T5 is a fifth temperature threshold, T6 is a sixth temperature threshold, and T7 is a seventh temperature threshold.

8. The method according to any one of claims 1 to 7, wherein in case of an abnormal refrigerant cycle, the method further comprises:

controlling the compressor to stop;

controlling the external fan to stop;

and controlling the inner fan to keep running.

9. An apparatus for detecting refrigerant abnormality, applied to a heating operation condition of an air conditioner, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the method for detecting refrigerant abnormality according to any one of claims 1 to 8 when executing the program instructions.

10. An air conditioner comprising a compressor and a heat exchanger, characterized by further comprising the device for detecting refrigerant abnormality according to claim 9.

11. A storage medium storing program instructions which, when executed, perform a method for detecting refrigerant anomalies as claimed in any one of claims 1 to 8.