CN113623818B - Heating mode fluorine deficiency detection method and device, air conditioner and computer readable storage medium - Google Patents

Abstract

The present invention provides a method, a device, an air conditioner, and a computer-readable storage medium for detecting fluorine deficiency in a heating mode. The control method is used for an air conditioner, and the detection method includes: starting up, selecting a heating mode, and detecting an inlet temperature of an outdoor heat exchanger. T ₁ and the outlet temperature T ₂ , and calculate the temperature difference value ΔT=T ₂ -T ₁ between the two to determine whether the actual temperature difference value ΔT is above the preset temperature difference value ΔT _threshold , if so, according to the first preset time t ₁ Defrost times n judges whether the air conditioner lacks fluorine. The present invention firstly determines whether the air conditioner may be in a state of lack of fluorine by detecting the temperature difference between the inlet and outlet of the outdoor heat exchanger, and then further determines whether the air conditioner is in a state of lack of fluorine through the number of defrosting times of the air conditioner within the first preset time under different outdoor ambient temperatures. Whether the air conditioner is deficient in fluorine or not, the present invention determines whether the air conditioner is deficient in fluorine through secondary judgment, so that the detection result is more accurate, and the judgment result is also more accurate, which overcomes the situation that the fluorine deficiency and false protection are prone to occur in the prior art, and greatly improves the User experience.

Description

Fluorine deficiency detection method, device, air conditioner and computer-readable storage medium in heating mode

technical field

The present invention relates to the field of air conditioners, and in particular, to a method and device for detecting fluorine deficiency in a heating mode, an air conditioner and a computer-readable storage medium.

Background technique

Fluorine plays a vital role as a refrigerant in air conditioners. Fluorine absorbs the heat of the cooling medium (water or air, etc.) in the evaporator and vaporizes it, and transfers the heat to the surrounding air or water in the condenser. Condensation can adjust the temperature. Therefore, in order to ensure the normal adjustment of the temperature, the fluorine content in the air conditioner is very important. The lack of fluorine is also a common fault in the use of the air conditioner. , not only the cooling and heating effect is poor, the electric energy is wasted, but also the compressor will be overheated. Long-term overheating will not only reduce the insulation performance and reliability of the motor, shorten the life of the motor, but also reduce the lubricating ability of the lubricating oil, and even cause lubrication. Oil carbonization and acid hydrolysis can damage the compressor and affect the life of the air conditioner.

The existing air conditioners mainly use the temperature difference value of the inner tube or the power comparison to judge the fluorine deficiency protection. In fact, the temperature difference value of the inner tube is simply used as the judgment condition for the fluorine deficiency protection. The slow change of the temperature of the lower inner tube is easy to cause the fluorine deficiency to malfunction, and the accuracy is not high; and most of the current air conditioners only trigger the fluorine deficiency protection function in the cooling mode, and the fluorine deficiency protection function is triggered when there is no fluorine deficiency or a small amount of fluorine deficiency. It is easy to be mistakenly protected in this case.

In view of this, the present invention is proposed.

SUMMARY OF THE INVENTION

The problem solved by the present invention is that in the prior art, most of the air conditioners only trigger the fluorine deficiency protection function in the cooling mode, and it is easy to misprotect when there is no fluorine deficiency or a small amount of fluorine deficiency.

In order to solve the above problems, the present invention discloses a method for detecting fluorine deficiency in a heating mode, which is used in an air conditioner. The detection method includes: starting the machine, selecting a heating mode, and detecting the inlet temperature T1 and outlet temperature T _of the outdoor heat exchanger ₂ , and calculate the temperature difference value ΔT=T ₂ -T ₁ between the two to determine whether the actual temperature difference value ΔT is above the preset temperature difference value ΔT _threshold , and if so, judge the air conditioner according to the number of defrosts n within the first preset time t ₁ Whether the device is deficient in fluorine.

The preset temperature difference value ΔT _threshold is set to help make a preliminary judgment on whether there may be a lack of fluorine. If this method is used alone, it is prone to misjudgment. It needs to cooperate with further judgment methods for accurate judgment. When heating, the fluorine in the outdoor heat exchanger will be fully vaporized, and its circulation speed will increase, which will lead to an increase in the frosting speed of the outdoor heat exchanger. Therefore, the number of defrosts n of the air conditioner within the preset time _t1 is compared The theoretical defrosting times n ₀ will also increase. According to this point, it can be accurately judged whether the air conditioner is deficient in fluorine, so that the air conditioner can respond in time, avoid long-term operation of the compressor under the condition of lack of fluorine, and avoid misjudgment. Abnormal shutdown improves the user experience and effectively protects the safety of the compressor.

Further, the value of the ΔT _threshold is between 3°C and 5°C.

The value of the ΔT _threshold is related to the energy efficiency of the air conditioner. Due to the difference in the compressor power and the amount of refrigerant in the air conditioner, the temperature difference between the inlet and outlet of the outdoor unit of the air conditioner will be different during operation. Set the corresponding ΔT _threshold value.

Further, "judging whether the air conditioner lacks fluorine according to the number of defrosts n within the first preset time _t1 " specifically includes: recording the number of defrosts n of the air conditioner within the first preset time _t1 , and calculating the number of defrosts. The difference Δn=nn ₀ determines whether the defrosting times difference Δn is above the preset defrosting times difference Δn _threshold , and if so, judges that the air conditioner lacks fluorine; where n ₀ is the theoretical defrosting times, which is a preset value.

When the air conditioner lacks fluorine, the fluorine in the outdoor heat exchanger will be fully vaporized during heating, so that the outdoor heat exchanger is in a state of overheating, thereby increasing the flow rate of fluorine. The frost formation rate of the heat exchanger increases, so the difference between the number of defrosts n of the air conditioner within the preset time t ₁ compared to the theoretical number of defrosts n ₀ will also increase significantly, according to which it can be accurately judged whether the air conditioner is Fluorine deficiency greatly improves the accuracy of fluorine deficiency judgment compared with the prior art.

Further, the theoretical defrosting times n ₀ is negatively correlated with the outdoor ambient temperature T, and the preset defrosting times difference Δn _threshold is negatively correlated with the outdoor ambient temperature.

With the decrease of the outdoor ambient temperature T, the frosting cycle of the air conditioner decreases, which will lead to an increase in the number of defrosting times. The defrosting operation is performed frequently, and the detection method can be set accordingly to accurately detect the fluorine deficiency of the air conditioner.

Further, when T>5°C, Δn _threshold =1; when -5°C≤T≤5°C, Δn _threshold =3; when T<5°C, Δn _threshold =5.

Because the theoretical defrosting times n ₀ and the actual defrosting times n of the air conditioner at different temperatures are significantly different, by setting the Δn _threshold at different outdoor ambient temperatures T, the air conditioner can be accurately judged at different outdoor temperatures. Whether the air conditioner lacks fluorine, thereby significantly improving the accuracy of the air conditioner lack of fluoride judgment.

Further, the value range of the first preset time _t1 is 3 to 5 hours.

Since the outdoor heat exchanger of the air conditioner needs to undergo frost and defrost for a certain period of time, if the value of t ₁ is too small, the air conditioner may not be defrosted or only defrosted once, which is not conducive to the lack of fluorine in the air conditioner. It is judged that there may be a problem of lack of fluorine but not detected. If the value of t ₁ is too large, although the air conditioner can accurately detect whether the air conditioner is lack of fluorine, this setting may cause the compressor to be lacking in fluorine for a long time. Operation, is not conducive to the service life of the compressor.

Further, when the air conditioner is judged to be deficient in fluorine, the fluorine deficient protection function is performed.

This setting can ensure the normal shutdown of the air conditioner when the system is deficient in fluorine, thereby effectively protecting the compressor and improving the reliability of the air conditioning system.

The invention also discloses a fluorine deficiency detection device in a heating mode, comprising: a temperature acquisition module, the temperature acquisition module is at least used to detect the inlet temperature T ₁ , the outlet temperature T ₂ of the outdoor heat exchanger and the outdoor temperature in the heating mode. ambient temperature T;

The defrosting counting module is used to count the defrosting times n of the air conditioner within the first preset time _t1 ;

The calculation module is used to calculate the temperature difference ΔT=T ₂ -T ₁ between the inlet temperature T ₁ and the outlet temperature T ₂ of the outdoor heat exchanger; and calculate the number of defrosts between the actual defrost times n and the theoretical defrost times n ₀ of the air conditioner difference Δn=nn ₀ ;

The judgment module is used for judging the magnitude relationship between the actual temperature difference value ΔT and the preset temperature difference value ΔT _threshold , as well as judging the magnitude relationship between the defrosting times difference value Δn and the preset defrosting times difference value Δn _threshold , and inputting the judgment result into the control module ;

The control module sends out a control instruction according to the judgment result input by the judgment module, and the control instruction is used for fluorine deficiency detection in the heating mode.

Through the cooperation between the above modules, during the heating operation of the air conditioner, the temperature difference ΔT between the inlet and outlet of the outdoor heat exchanger is used to preliminarily determine whether the air conditioner may be deficient in fluorine, and then through the first preset time t ₁ The defrosting times n of the air conditioner are accurately judged twice, so as to accurately detect whether the air conditioner lacks fluorine. The detection method is simple and practical, and greatly improves the accuracy of the air conditioner lack of fluorine detection.

The present invention also discloses an air conditioner, comprising a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, the above-mentioned heating mode defect is realized. Fluorine detection method.

The air conditioner has the same advantages as the above-mentioned method for detecting fluorine deficiency in a heating mode relative to the prior art, and details are not described herein again.

The present invention also discloses a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program is read and run by a processor, the above-mentioned heating mode of fluorine deficiency can be realized Detection method.

Compared with the prior art, the method, device, air conditioner and computer-readable storage medium for detecting fluorine deficiency in heating mode according to the present invention have the following advantages:

When the air conditioner is in the heating mode, the present invention firstly determines whether the air conditioner may be in a fluorine-deficient state by detecting the temperature difference between the inlet and outlet of the outdoor heat exchanger, and then determines whether the air conditioner may be in a fluorine-deficient state by detecting the temperature difference between the outdoor heat exchangers. The number of defrosting times is 100%, to further judge whether the air conditioner is deficient in fluorine, and the present invention determines whether the air conditioner is deficient in fluorine through secondary judgment, so that the detection result is more accurate, and the judgment result is also more accurate, which overcomes the defects that are prone to occur in the prior art. The situation of fluorine misprotection greatly improves the user experience.

Description of drawings

FIG. 1 is a schematic flowchart of a method for detecting fluorine deficiency in a heating mode according to an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are some, but not all, of the embodiments of the present invention. The specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention. It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

A method, device, air conditioner, and computer-readable storage medium for detecting fluorine deficiency in a heating mode according to embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Example 1

This embodiment provides a method for detecting fluorine deficiency in a heating mode, which is used in an air conditioner. As shown in FIG. 1 , the detection method includes: starting the machine, selecting a heating mode, and detecting the inlet temperature T1 and outlet temperature _of the outdoor heat exchanger T ₂ , and calculate the temperature difference value ΔT=T ₂ -T ₁ between the two to determine whether the actual temperature difference value ΔT is above the preset temperature difference value ΔT _threshold , and if so, judge according to the number of defrosts n within the first preset time t ₁ Whether the air conditioner lacks fluorine.

The specific steps are:

Step S1: start up;

Step S2: select the heating mode;

Step S3: Detect the inlet temperature T ₁ and outlet temperature T ₂ of the outdoor heat exchanger, and calculate the temperature difference between them ΔT=T ₂ −T ₁ ;

Step S4: judging whether the actual temperature difference value ΔT is above the preset temperature difference value ΔT _threshold , and if so, go to step S5;

Step S5: If so, determine whether the air conditioner is deficient in fluorine according to the number of defrosts n within the first preset time _t1 , if yes, execute step S6, if not, return to step S3;

Step S6: performing the fluorine deficiency protection function.

Normally, when the air conditioner is in the heating mode, in order to prevent the compressor from returning liquid, the refrigerant in the outdoor heat exchanger needs to be completely vaporized before entering the compressor. Ideally, when ΔT=0 When , it means that the outdoor heat exchanger has reached the equilibrium state of complete gasification of fluorine. However, considering the loss of heat along the way during the fluorine cycle, ΔT is usually required to be above 0, so as to avoid damage caused by the inhalation of liquid by the compressor. However, when ΔT is high to a certain level, it means that the overheating of the outdoor heat exchanger is too high, and the amount of fluorine during the cycle is insufficient. This situation may be caused by the lack of fluorine in the system, or it may be caused by other reasons. Therefore, the preset temperature difference value ΔT _threshold can be set to help make a preliminary judgment on whether there may be a lack of fluorine. If this method is used alone, it is prone to misjudgment, and further judgment methods are needed to make accurate judgments. When the air conditioner lacks fluorine When heating, the fluorine in the outdoor heat exchanger will be fully vaporized, and the increase in its circulation speed will lead to an increase in the frosting speed of the outdoor heat exchanger, so the number of defrosting times of the air conditioner within the preset time t ₁ Compared with the theoretical defrosting times n ₀ , n will also increase. According to this point, it is possible to accurately determine whether the air conditioner is deficient in fluorine, so that the air conditioner can respond in time, avoid the long-term operation of the compressor under the condition of lack of fluorine, and avoid errors. The abnormal shutdown caused by the judgment improves the user experience and effectively protects the use safety of the compressor. It should be noted that the fluorine deficiency protection function described in this embodiment generally refers to the detection After the lack of fluorine, the air conditioner shuts down protectively in order to effectively protect the compressor and improve the reliability of the air conditioner system.

In this embodiment, "judging whether the air conditioner lacks fluorine according to the number of defrosts n within the first preset time _t1 " specifically includes:

Record the defrosting times n of the air conditioner within the first preset time t ₁ , calculate the defrosting times difference Δn=nn ₀ , and determine whether the defrosting times difference Δn is above the preset defrosting times difference Δn _threshold , if so Then it is judged that the air conditioner lacks fluorine; wherein n ₀ is the theoretical defrosting times, which is a preset value.

That is, step S5 specifically includes:

Step S51 : record the number of defrosts of the air conditioner within the first preset time t ₁ , and calculate the difference in the number of defrosts Δn=nn ₀ ;

Step S52: Determine whether the defrosting times difference Δn is above the preset defrosting times difference Δn _threshold , if so, determine that the air conditioner lacks fluorine, and go to step S6; if not, return to step S3.

When the air conditioner lacks fluorine, the fluorine in the outdoor heat exchanger will be fully vaporized during heating, so that the outdoor heat exchanger is in a state of overheating, thereby increasing the flow rate of fluorine. The frost formation rate of the heat exchanger increases, so the difference between the number of defrosts n of the air conditioner within the preset time t ₁ compared to the theoretical number of defrosts n ₀ will also increase significantly, according to which it can be accurately judged whether the air conditioner is Fluorine deficiency greatly improves the accuracy of fluorine deficiency judgment compared with the prior art.

In some of the embodiments, the theoretical defrosting times n ₀ is negatively correlated with the outdoor ambient temperature T, and the preset defrosting times difference Δn _threshold is negatively correlated with the outdoor ambient temperature, that is, when the outdoor ambient temperature T When increasing, the _threshold of the difference Δn between the theoretical number of defrosts n ₀ and the preset number of defrosts gradually decreases, and when the outdoor ambient temperature decreases, the _threshold of the difference Δn between the theoretical number of defrosts n ₀ and the preset number of defrosts gradually increases. With the decrease of the outdoor ambient temperature T, the frosting cycle of the air conditioner decreases, which will lead to an increase in the number of defrosting times. The defrosting operation is performed frequently, and the detection method can be set accordingly to accurately detect the fluorine deficiency of the air conditioner.

As an embodiment of the present invention, when T>5°C, Δn _threshold =1; when -5°C≤T≤5°C, Δn _threshold =3; when T<5°C, Δn _threshold =5. Because the theoretical defrosting times n ₀ and the actual defrosting times n of the air conditioner at different temperatures are significantly different, by setting the Δn _threshold at different outdoor ambient temperatures T, the air conditioner can be accurately judged at different outdoor temperatures. Whether the air conditioner lacks fluorine, thereby significantly improving the accuracy of the air conditioner lack of fluoride judgment.

In some of the embodiments, the value of the ΔT _threshold is between 3 and 5°C. Specifically, the value of the ΔT _threshold is related to the energy efficiency of the air conditioner, because the compressor power and the amount of refrigerant in the air conditioner The temperature difference between the inlet and outlet of the outdoor unit of the air conditioner will be different during operation. In one embodiment, the ΔT _threshold of the high-energy-efficiency model is 3°C, and the ΔT _threshold of the low-energy-efficiency model is 5°C. ℃, the ΔT _threshold of the medium-energy-efficiency model is 4℃, and usually when the actually detected ΔT ≥ the ΔT _threshold , it can be preliminarily determined that the air conditioner may be deficient in fluorine.

In this embodiment, the value range of the first preset time t ₁ is 3 to 5 hours. Preferably, the t ₁ =4 hours. The above time range is determined by the technical personnel of the present application according to actual experiments. Obtained, because the outdoor heat exchanger of the air conditioner needs to undergo a certain period of time for frosting and defrosting, if the value of t ₁ is too small, the air conditioner may not be defrosted or only defrosted once, which is not conducive to the lack of fluorine in the air conditioner. Judging from the situation, there may be a problem of lack of fluorine but not detected. If the value of t ₁ is too large, although it can accurately detect whether the air conditioner lacks fluorine, this setting may cause the compressor to lack fluorine. Running for a long time is not conducive to the service life of the compressor.

As a preferred embodiment, after the air conditioner is turned on for a second preset time t ₂ , the inlet temperature T ₁ and the outlet temperature T ₂ of the outdoor heat exchanger are detected again. That is, after the air conditioner is turned on for a second preset time t2, the fluorine deficiency detection of the air conditioner starts. The value range of the second preset time _t2 is 6 to 10 minutes, preferably 8 minutes. When the air conditioner is turned on, the compressor has just started, and the running state of the air conditioner is not stable. At this time, the temperature difference between the inlet and outlet of the outdoor heat exchanger is prone to fluctuations. When the air conditioner runs for the second preset time _t2 , the compressor operation tends to stable, and the temperature difference between the inlet and outlet of the outdoor heat exchanger is also in a relatively stable state. At this time, starting the fluorine deficiency detection of the air conditioner can obtain more accurate detection results.

In this embodiment, when it is judged that the air conditioner is deficient in fluorine, the fluorine deficient protection function is performed. This setting can ensure the normal shutdown of the air conditioner when the system is deficient in fluorine, thereby effectively protecting the compressor and improving the reliability of the air conditioning system. .

Optionally, when the air conditioner performs the fluorine deficiency protection function, a prompt message will be issued at the same time to remind the user that the air conditioner is in a state of fluorine deficiency, so that it can be filled with fluorine in time, thereby ensuring the normal operation of the air conditioner. The prompt information includes but Not limited to voice, beep, text display, code display, and in the air conditioner with WIFI function, the prompt information can also be a notification message in the APP or sent to the mobile terminal in the form of short message, and the mobile terminal includes but It is not limited to mobile phones and tablet computers, so that users can timely know that the air conditioner is in a fluorine-deficient state.

It should be noted that the method for detecting fluorine deficiency in heating mode provided in this embodiment can be used for both fixed frequency air conditioners and variable frequency air conditioners. There are few settings for temperature and pressure detection in the outdoor unit of the fixed-frequency air conditioner. Therefore, the method for detecting fluorine deficiency in the heating mode provided in this embodiment is preferably used for the fixed-frequency air conditioner.

Example 2

This embodiment discloses a heating mode fluorine deficiency detection device, and the heating mode fluorine deficiency detection device is used to implement the heating mode fluorine deficiency detection method described in Embodiment 1.

The heating mode fluorine deficiency detection device includes:

A temperature acquisition module, which is at least used to detect the inlet temperature T ₁ , the outlet temperature T ₂ and the outdoor ambient temperature T of the outdoor heat exchanger in the heating mode; in some embodiments, the temperature acquisition module is a temperature sensor or temperature sensor;

The defrosting counting module is used to count the defrosting times n of the air conditioner within the first preset time _t1 ;

The calculation module is used to calculate the temperature difference ΔT=T ₂ -T ₁ between the inlet temperature T ₁ and the outlet temperature T ₂ of the outdoor heat exchanger; and calculate the number of defrosts between the actual defrost times n and the theoretical defrost times n ₀ of the air conditioner difference Δn=nn ₀ ;

The judgment module is used for judging the magnitude relationship between the actual temperature difference value ΔT and the preset temperature difference value ΔT _threshold , as well as judging the magnitude relationship between the defrosting times difference value Δn and the preset defrosting times difference value Δn _threshold , and inputting the judgment result into the control module ;

The control module sends out a control instruction according to the judgment result input by the judgment module, and the control instruction is used for fluorine deficiency detection in the heating mode.

Through the cooperation between the above modules, during the heating operation of the air conditioner, the temperature difference ΔT between the inlet and outlet of the outdoor heat exchanger is used to preliminarily determine whether the air conditioner may be deficient in fluorine, and then through the first preset time t ₁ The defrosting times n of the air conditioner are accurately judged twice, so as to accurately detect whether the air conditioner lacks fluorine. The detection method is simple and practical, and greatly improves the accuracy of the air conditioner lack of fluorine detection.

Example 3

This embodiment discloses an air conditioner, and the air conditioner includes the heating mode fluorine deficiency detection device described in Embodiment 2.

The air conditioner disclosed in this embodiment includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, the one described in Embodiment 1 is implemented. Fluorine deficiency detection method in heating mode.

The air conditioner has the same advantages as the method for detecting fluorine deficiency in a heating mode described in Embodiment 1 over the prior art, which will not be repeated here.

Example 4

This embodiment discloses a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is read and executed by a processor, a heating mode as described in Embodiment 1 is implemented. Fluorine deficiency detection method.

Although the present invention is disclosed above, the present invention is not limited thereto. In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc., is meant to incorporate the embodiments A particular feature, structure, material, or characteristic described by an example or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (8)

1. A method for detecting fluorine deficiency in a heating mode, characterized in that, for an air conditioner, the detection method comprises: starting the machine, selecting a heating mode, detecting the inlet temperature T ₁ and outlet temperature T ₂ of the outdoor heat exchanger, and Calculate the temperature difference value ΔT=T ₂ -T ₁ between the two, and determine whether the actual temperature difference value ΔT is above the preset temperature difference value ΔT _threshold , and if so, determine whether the air conditioner is lacking according to the number of defrosts n within the first preset time t ₁ fluorine; Wherein, "judging whether the air conditioner lacks fluorine according to the number of defrosts n in the first preset time _t1 " specifically includes: Record the defrosting times n of the air conditioner within the first preset time t ₁ , calculate the defrosting times difference Δn=nn ₀ , and determine whether the defrosting times difference Δn is above the preset defrosting times difference Δn _threshold , if so Then it is judged that the air conditioner lacks fluorine; wherein n ₀ is the theoretical defrosting times, which is a preset value; The theoretical defrosting times n ₀ is negatively correlated with the outdoor ambient temperature T, and the preset defrosting times difference Δn _threshold is negatively correlated with the outdoor ambient temperature. 2 . The method for detecting fluorine deficiency in heating mode according to claim 1 , wherein the value of the ΔT threshold is between 3°C and 5°C. 3 . 3. The method for detecting fluorine deficiency in heating mode according to claim 1, characterized in that, When T>5℃, Δn _threshold =1; When -5℃≤T≤5℃, Δn _threshold =3; When T<5°C, Δn _threshold =5. 4 . The method for detecting fluorine deficiency in a heating mode according to claim 1 , wherein the value of the first preset time t ₁ ranges from 3 to 5 hours. 5 . 5 . The method for detecting lack of fluorine in heating mode according to claim 4 , wherein when the air conditioner is judged to be lack of fluorine, a protection function of lack of fluorine is performed. 6 . 6. A heating mode fluorine deficiency detection device, using the heating mode fluorine deficiency detection method according to any one of claims 1-5, characterized in that, comprising: a temperature acquisition module, the temperature acquisition module is at least used to detect the inlet temperature T ₁ , the outlet temperature T ₂ and the outdoor ambient temperature T of the outdoor heat exchanger in the heating mode; The defrosting counting module is used to count the defrosting times n of the air conditioner within the first preset time _t1 ; The calculation module is used to calculate the temperature difference ΔT=T ₂ -T ₁ between the inlet temperature T ₁ and the outlet temperature T ₂ of the outdoor heat exchanger; and calculate the number of defrosts between the actual defrost times n and the theoretical defrost times n ₀ of the air conditioner difference Δn=nn ₀ ; The judgment module is used for judging the magnitude relationship between the actual temperature difference value ΔT and the preset temperature difference value ΔT _threshold , as well as judging the magnitude relationship between the defrosting times difference value Δn and the preset defrosting times difference value Δn _threshold , and inputting the judgment result into the control module ; The control module sends out a control instruction according to the judgment result input by the judgment module, and the control instruction is used for fluorine deficiency detection in the heating mode. 7. An air conditioner, characterized in that it comprises a computer-readable storage medium and a processor stored with a computer program, and when the computer program is read and run by the processor, it realizes any one of claims 1-5. The described method for detecting fluorine deficiency in heating mode. 8. A computer-readable storage medium, characterized in that, the computer-readable storage medium stores a computer program, and when the computer program is read and run by a processor, the computer program realizes the method as claimed in any one of claims 1-5. A method for detecting fluorine deficiency in heating mode.

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