Refrigerant leakage detection method and device, air conditioner and storage medium

Abstract

The invention discloses a refrigerant leakage detection method and device, an air conditioner and a storage medium, and the refrigerant leakage detection method comprises the steps that after the air conditioner is started and it is determined that a compressor operates normally, the compressor is controlled to operate at a first frequency for a first duration; after the compressor operates at the first frequency for a first duration, the return air superheat degree is determined according to the instantaneous current of the compressor and the indoor coil pipe temperature; after it is determined that the return air superheat degree is larger than or equal to the first preset value, whether the return air superheat degree is larger than a second preset value or not is determined, and the second preset value is larger than the first preset value; if the air return superheat degree is larger than a second preset value, it is determined that refrigerant leakage happens to the air conditioner; whether the air conditioner leaks or not can be determined through the instantaneous current of the compressor and the temperature of the indoor coil pipe, the cost of a plurality of refrigerant sensors can be saved, and the refrigerant detection cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a refrigerant leakage detection method, device, air conditioner and storage medium. Background Art

[0002] An air conditioner, that is, an air conditioner, is composed of four parts: a refrigeration (heating) cycle system, an air circulation and ventilation system, an electrical control system, and a box body, and is a mechanical device that keeps the air in the regulated space at a certain temperature, humidity, flow rate, cleanliness and freshness; generally, the refrigeration (heating) cycle system mainly compresses the refrigerant through a compressor to exchange heat with the air, so as to realize the refrigeration or heating of the air conditioner.

[0003] However, due to welding problems during the production process of the air conditioner and wear and corrosion during long-term operation, etc., it is possible for the refrigerant to leak during the use of the air conditioner, and the existing methods for detecting refrigerant leakage mainly set sensors at various positions of the air conditioner, resulting in an increase in production cost and a decrease in production efficiency. Summary of the Invention

[0004] The main purpose of the embodiments of the present invention is to provide a refrigerant leakage detection method, device, air conditioner and storage medium, aiming to improve the technical problem of high cost of refrigerant leakage detection in the existing technology.

[0005] The embodiments of the present invention provide a refrigerant leakage detection method, including:

[0006] After the air conditioner is turned on and it is determined that the compressor is operating normally, control the compressor to operate at a first frequency for a first duration;

[0007] After the compressor operates at the first frequency for the first duration, determine the suction superheat based on the instantaneous current of the compressor and the indoor coil temperature;

[0008] After determining that the suction superheat is greater than or equal to the first preset value, determine whether the suction superheat is greater than a second preset value, where the second preset value is greater than the first preset value;

[0009] If the suction superheat is greater than the second preset value, determine that the air conditioner has a refrigerant leakage.

[0010] In some embodiments of the present invention, the refrigerant leakage detection method further includes:

[0011] If the suction superheat is less than the first preset value, the compressor is controlled again to operate at the first frequency for the first duration, and the suction superheat is determined again according to the instantaneous current of the compressor and the indoor coil temperature until the suction superheat is greater than or equal to the first preset value.

[0012] In some embodiments of the present invention, the determining the suction superheat according to the instantaneous current of the compressor and the indoor coil temperature includes:

[0013] Determine the evaporation saturation temperature according to the indoor coil temperature;

[0014] Determine the suction temperature according to the evaporation saturation temperature and the instantaneous current of the compressor;

[0015] Determine the suction superheat according to the suction temperature and the evaporation saturation temperature.

[0016] In some embodiments of the present invention, the determining the evaporation saturation temperature according to the indoor coil temperature includes:

[0017] Determine the average tube temperature of the indoor coil within a preset time according to the indoor coil temperature;

[0018] Determine the evaporation saturation temperature according to the average tube temperature.

[0019] In some embodiments of the present invention, the determining the suction temperature according to the evaporation saturation temperature and the instantaneous current of the compressor includes:

[0020] Determine the suction temperature according to the instantaneous current of the compressor, the reference current and the evaporation saturation temperature.

[0021] In some embodiments of the present invention, the refrigerant leakage detection method further includes:

[0022] After determining that the air conditioner has refrigerant leakage, determine the indoor coil temperature change rate and the outdoor coil temperature change rate according to the indoor coil temperature and the outdoor coil temperature;

[0023] Determine the refrigerant leakage position of the air conditioner according to the indoor coil temperature change rate and the outdoor coil temperature change rate.

[0024] In some embodiments of the present invention, the determining the refrigerant leakage position of the air conditioner according to the indoor coil temperature change rate and the outdoor coil temperature change rate includes:

[0025] If the indoor coil temperature change rate is inconsistent with the first standard change rate, it is determined that the indoor heat exchanger coil is leaking;

[0026] If the change rate of the outdoor coil temperature is inconsistent with the second standard change rate, it is determined that the outdoor heat exchanger coil leaks.

[0027] In some embodiments of the present invention, there is also provided a refrigerant leakage detection device, including:

[0028] An acquisition module, configured to acquire the instantaneous current of the compressor and the indoor coil temperature;

[0029] A judgment module, configured to judge whether the suction superheat is greater than or equal to a first preset value; and configured to judge whether the suction superheat is greater than a second preset value, where the second preset value is greater than the first preset value; and configured to judge whether the suction superheat is greater than the second preset value;

[0030] A control module, configured to, after the air conditioner is turned on and it is determined that the compressor is operating normally, control the compressor to operate at a first frequency for a first duration; and configured to, after the compressor operates at the first frequency for the first duration, determine the suction superheat according to the instantaneous current of the compressor and the indoor coil temperature; and configured to, when the suction superheat is greater than the second preset value, determine that the air conditioner has a refrigerant leakage.

[0031] In some embodiments of the present invention, there is also provided an air conditioner, including a memory and a processor, where the memory stores a computer program, and the processor is configured to run the computer program in the memory to execute the steps in the above refrigerant leakage detection method.

[0032] In some embodiments of the present invention, there is also provided a storage medium, where the storage medium stores a computer program, and the computer program is loaded and executed by a processor to execute the steps in the above refrigerant leakage detection method.

[0033] Embodiments of the present invention provide a refrigerant leakage detection method, device, air conditioner and storage medium. The refrigerant leakage detection method determines the suction superheat through the instantaneous current of the compressor and the indoor coil temperature, and then determines whether the air conditioner has a refrigerant leakage according to the suction superheat; that is, the present invention can determine whether the air conditioner leaks through the instantaneous current of the compressor and the indoor coil temperature, which can save the cost of multiple refrigerant sensors and reduce the refrigerant detection cost. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0035] Figure 1 Schematic flow chart of a refrigerant leakage detection method according to an embodiment of the present invention;

[0036] Figure 2 Schematic flow chart of a refrigerant leakage detection method according to the second embodiment of the present invention;

[0037] Figure 3 Schematic flow chart of a refrigerant leakage detection method according to the third embodiment of the present invention;

[0038] Figure 4 Schematic structural diagram of a refrigerant leakage detection device according to an embodiment of the present invention;

[0039] Figure 5 Schematic structural diagram of an air conditioner according to an embodiment of the present invention.

[0040] Reference numerals: 10, refrigerant leakage detection device; 100, acquisition module; 200, judgment module; 300, control module; 601, processor; 602, memory; 603, power supply; 604, input unit. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0043] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] As Figures 1 - 5 shown, the present invention provides a refrigerant leakage detection method, which includes:

[0046] S100, after the air conditioner is turned on and it is determined that the compressor is operating normally, control the compressor to operate at a first frequency for a first duration.

[0047] Among them, generally, the power and operating frequency of the compressor are determined by the voltage and current of the compressor, and then it is determined whether the compressor is operating normally. If the power and operating frequency of the compressor conform to the corresponding relationship, it is determined that the compressor is operating normally; if the power and operating frequency of the compressor do not conform to the corresponding relationship, it is determined that the compressor is not operating normally. Among them, the corresponding relationship generally means that each power corresponds to an operating frequency.

[0048] That is, after it is determined that the compressor is in a normal operating state, control the compressor to operate at the first frequency pre-stored in the controller of the air conditioner for a first duration according to the set duration, so as to adjust the suction superheat of the air conditioner to an appropriate range.

[0049] Specifically, for example, if the first frequency is 50 Hz and the first duration is 5 minutes, after it is determined that the air conditioner is turned on and the compressor is operating normally, control the compressor to operate at 50 Hz for 5 minutes.

[0050] S200. After the compressor operates at the first frequency for the first duration, determine the suction superheat according to the instantaneous current of the compressor and the indoor coil temperature.

[0051] Among them, after the compressor operates according to the set program, obtain the instantaneous current of the compressor and the indoor coil temperature to determine the suction superheat.

[0052] Among them, the indoor coil temperature is the temperature of the indoor heat exchanger coil.

[0053] S300. After determining that the suction superheat is greater than or equal to the first preset value, determine whether the suction superheat is greater than the second preset value, where the second preset value is greater than the first preset value.

[0054] Among them, both the first preset value and the second preset value are data pre-stored in the air conditioner controller. After determining the suction superheat, first compare the suction superheat with the first preset value. If the suction superheat is less than the first preset value, generally determine that the suction superheat is invalid data and the suction superheat needs to be recalculated; after determining that the suction superheat is greater than or equal to the first preset value, then compare the suction superheat with the second preset value, and judge whether the air conditioner leaks according to the comparison result between the second preset value and the suction superheat.

[0055] S301. If the suction superheat is greater than the second preset value, determine that the refrigerant in the air conditioner leaks.

[0056] For example, when the second preset value is 8°C, if the suction superheat is 10°C, it is determined that the refrigerant in the air conditioner leaks.

[0057] It can be understood that the refrigerant leakage detection method determines the suction superheat through the instantaneous current of the compressor and the indoor coil temperature, and then determines whether the air conditioner leaks refrigerant according to the suction superheat; that is, the present invention can determine whether the air conditioner leaks through the instantaneous current of the compressor and the indoor coil temperature, which can save the cost of multiple refrigerant sensors and reduce the refrigerant detection cost.

[0058] In some embodiments, the refrigerant leakage detection method further includes:

[0059] S250. If the suction superheat is less than the first preset value, control the compressor to run at the first frequency for the first duration again, and determine the suction superheat again according to the instantaneous current of the compressor and the indoor coil temperature until the suction superheat is greater than the first preset value.

[0060] That is, after the compressor is first controlled to run at the first frequency for the first duration, if the determined suction superheat is less than the first preset value, control the compressor to run at the first frequency for the first duration again and determine the new suction superheat. If the newly determined suction superheat is still less than the first preset value, repeat the above steps to determine the suction superheat until the suction superheat is greater than or equal to the first preset value.

[0061] Specifically, for example, the first preset value is 5°C and the second preset value is 8°C. If the suction superheat degree determined after the compressor is first controlled to operate at the first frequency for the first duration is 6°C, then the suction superheat degree (6°C) is directly compared with the second preset value (8°C) to determine whether the air conditioner has a leakage. If the suction superheat degree determined after the compressor is first controlled to operate at the first frequency for the first duration is 4°C, then the compressor is controlled to operate at the first frequency for the first duration again, and the suction superheat degree determined again. If the suction superheat degree determined for the second time is greater than or equal to the first preset value (5°C), then the newly determined suction superheat degree is compared with the second preset value (8°C). If the suction superheat degree determined for the second time is less than the first preset value (5°C), then the compressor is controlled to operate at the first frequency for the first duration again, and the suction superheat degree determined again, until the determined suction superheat degree is greater than the first preset value (5°C), and then the suction superheat degree is compared with the second preset value.

[0062] In some embodiments, in S200, determining the suction superheat degree according to the instantaneous current of the compressor and the indoor coil temperature includes:

[0063] S210, determining the evaporation saturation temperature according to the indoor coil temperature.

[0064] Wherein, the indoor coil temperature is the coil temperature of the indoor heat exchanger, and is generally obtained in real time through a temperature sensor arranged on the coil of the indoor heat exchanger.

[0065] S220, determining the suction temperature according to the evaporation saturation temperature and the instantaneous current of the compressor.

[0066] Wherein, the suction temperature generally has a proportional relationship with the current of the compressor, that is, when the suction temperature of the compressor increases, the load of the compressor increases, and further causes the current of the compressor to increase. Therefore, the suction temperature can be determined according to the instantaneous current of the compressor and the evaporation saturation temperature.

[0067] S230, determining the suction superheat degree according to the suction temperature and the evaporation saturation temperature.

[0068] Wherein, the suction superheat degree is ΔT, the suction temperature is T R , the evaporation saturation temperature is T ES , wherein ΔT = T R - T ES .

[0069] In some embodiments, S210, determining the evaporation saturation temperature according to the indoor coil temperature, includes:

[0070] S211, determining the average tube temperature of the indoor coil within a preset time according to the indoor coil temperature.

[0071] Among them, generally, the indoor coil temperature is obtained multiple times through a temperature sensor within a preset time, and based on the multiple obtained indoor coil temperatures, the average pipe temperature of the indoor coil within the preset time is determined.

[0072] Specifically, for example, if the preset time is 2 minutes, the indoor coil temperature is obtained every 30s and recorded as T 1 , T 2 ,... T n , then the average pipe temperature is:

[0073] S212. Determine the evaporation saturation temperature according to the average pipe temperature.

[0074] Among them, after determining the average pipe temperature T T , it is necessary to select the corresponding compensation value according to the ambient temperature and the refrigerant type, compensate the average pipe temperature, and then determine the evaporation saturation temperature. The ambient temperature here is the indoor ambient temperature.

[0075] That is, the evaporation saturation temperature T ES = T T + ΔT C .

[0076] Among them, ΔT C is the compensation temperature determined based on the ambient temperature and the refrigerant type, and generally can be found and determined according to the corresponding relationship pre-stored in the air conditioner controller.

[0077] In some embodiments, S220. Determine the suction gas temperature according to the evaporation saturation temperature and the instantaneous current of the compressor, including:

[0078] Determine the suction gas temperature according to the instantaneous current of the compressor, the reference current, and the evaporation saturation temperature.

[0079] Among them, the reference current is generally determined according to the ambient temperature. The ambient temperature here is the outdoor ambient temperature. That is, the reference current A R = k * T E + ΔA C ; where T E is the outdoor ambient temperature, ΔA C is the compressor current correction value, generally determined according to the self-parameters of the compressor and pre-stored in the air conditioner controller. k is the compensation coefficient pre-stored in the air conditioner controller, and is generally also determined according to the self-parameters of the compressor.

[0080] Generally, during the development and debugging process of the air conditioner, multiple sets of instantaneous currents of the compressor and the corresponding ambient temperatures are obtained through simulation, and according to the multiple sets of simulation data, the curve function of the corresponding current and ambient temperature is fitted, and then k and ΔA C are determined.

[0081] Generally, there is a corresponding relationship among the evaporation saturation temperature, the suction gas temperature, the instantaneous current of the compressor, and the reference current, that is Then it can be determined where A I is the instantaneous current of the compressor, that is, the suction gas temperature can be determined according to the instantaneous current of the compressor, the reference current, and the evaporation saturation temperature.

[0082] In some embodiments, the refrigerant leakage detection method further includes:

[0083] S400. After determining that the air conditioner has refrigerant leakage, determine the indoor coil temperature change rate and the outdoor coil temperature change rate according to the indoor coil temperature and the outdoor coil temperature.

[0084] Among them, to determine the indoor coil temperature change rate, generally collect the indoor coil temperature at the start time point of the set time and the indoor coil temperature at the end time point of the set time, so as to calculate the temperature change rate indoors within the set time. Specifically, for example, the set time is t, the indoor coil temperature at the start time point of the set time is T in0 , and the indoor coil temperature at the end time point of the set time is T in1 , then the indoor coil temperature change rate within t time where α t is the indoor coil temperature change rate.

[0085] Similarly, referring to the above content, collect the outdoor coil temperature at the start time point of the set time and the outdoor coil temperature at the end time point of the set time, so as to calculate the outdoor temperature change rate within the set time. Specifically, for example, the set time is t, the outdoor coil temperature at the start time point of the set time is T out0 , and the outdoor coil temperature at the end time point of the set time is T out1 , then the outdoor coil temperature change rate within t time where β t is the outdoor coil temperature change rate.

[0086] S500. Determine the refrigerant leakage location of the air conditioner according to the indoor coil temperature change rate and the outdoor coil temperature change rate.

[0087] It can be understood that in the pipeline system, fluid leakage usually affects the area near the leakage point first and then gradually affects more distant areas. That is, when refrigerant leaks, the flow rate near the refrigerant leakage point will change first, which will cause the heat exchange effect in this area to change, and then cause the temperature change rate to deviate from the normal situation. Therefore, the indoor coil temperature change rate and the outdoor coil temperature change rate can be used.

[0088] In some embodiments, in S500, determining the refrigerant leakage location of the air conditioner according to the indoor coil temperature change rate and the outdoor coil temperature change rate includes:

[0089] S510, if the indoor coil temperature change rate is inconsistent with the first standard change rate, it is determined that the indoor heat exchanger coil is leaking.

[0090] Wherein, the first standard change rate is the normal temperature change rate of the indoor coil temperature within the corresponding time when the refrigerant does not leak; if the indoor coil temperature change rate is inconsistent with the first standard change rate, it can be determined that the indoor heat exchanger coil has refrigerant leakage; on the contrary, if the indoor coil temperature change rate is consistent with the first standard change rate, it can be determined that the indoor heat exchanger coil has no refrigerant leakage.

[0091] S520, if the outdoor coil temperature change rate is inconsistent with the second standard change rate, it is determined that the outdoor heat exchanger coil is leaking.

[0092] Similarly, the second standard change rate is the normal temperature change rate of the outdoor coil temperature within the corresponding time when the refrigerant does not leak. If the outdoor coil temperature change rate is inconsistent with the second standard change rate, it can be determined that the outdoor heat exchanger coil has refrigerant leakage; on the contrary, if the outdoor coil temperature change rate is consistent with the second standard change rate, it can be determined that the outdoor heat exchanger coil has no leakage.

[0093] In some embodiments, an indoor coil temperature change model based on time and the indoor coil temperature change rate can be established according to the indoor coil temperature change rate and compared with the first standard change model. If the indoor coil temperature change model is consistent with the first standard change model, it can be determined that the indoor heat exchanger coil has no leakage. If the indoor coil temperature change model is inconsistent with the first standard change model, it can be determined that the indoor heat exchanger coil has refrigerant leakage.

[0094] Wherein, the first standard change model is an indoor coil temperature change rate model established based on the indoor coil when the refrigerant does not leak.

[0095] In some embodiments, an outdoor coil temperature change model based on time and the outdoor coil temperature change rate can be established according to the outdoor coil temperature change rate and compared with the second standard change model. If the outdoor coil temperature change model is consistent with the second standard change model, it can be determined that the outdoor heat exchanger coil has no leakage. If the outdoor coil temperature change model is inconsistent with the second standard change model, it can be determined that the outdoor heat exchanger coil has refrigerant leakage.

[0096] Wherein, the second standard change model is an outdoor coil temperature change rate model established based on the outdoor coil when the refrigerant does not leak.

[0097] In some embodiments, the present invention further provides a refrigerant leakage detection device 10, including an acquisition module 100, a judgment module 200, and a control module 300. The acquisition module 100 is configured to acquire the instantaneous current of the compressor and the indoor coil temperature. The judgment module 200 is configured to judge whether the suction superheat is greater than or equal to a first preset value. The judgment module 200 is further configured to judge whether the suction superheat is greater than a second preset value, where the second preset value is greater than the first preset value. The judgment module 200 is further configured to judge whether the suction superheat is greater than the second preset value. The control module 300 is configured to control the compressor to operate at a first frequency for a first duration after the air conditioner is turned on and it is determined that the compressor is operating normally. The control module 300 is further configured to determine the suction superheat according to the instantaneous current of the compressor and the indoor coil temperature after the compressor operates at the first frequency for the first duration. The control module 300 is further configured to determine that the air conditioner has refrigerant leakage when the suction superheat is greater than the second preset value.

[0098] In some embodiments, the present invention further provides an air conditioner, which may include components such as a processor 601 with one or more processing cores, a memory 602 with one or more computer-readable storage media, a power supply 603, and an input unit 604. Those skilled in the art can understand that the above structure of the air conditioner does not constitute a limitation to the air conditioner, and it may include more or fewer components, or combine certain components, or arrange different components. Among them:

[0099] The processor 601 is the controller of the air conditioner, connecting various parts of the entire air conditioner through various interfaces and lines, and executing various functions of the air conditioner and processing data by running or executing software programs and / or modules stored in the memory 602, and calling data stored in the memory 602, so as to perform overall monitoring of the air conditioner. Optionally, the processor 601 may include one or more processing cores; preferably, the processor 601 may integrate an application processor 601 and a modulation and demodulation processor 601, where the application processor 601 mainly processes the operating system, user interface, and computer programs, etc., and the modulation and demodulation processor 601 mainly processes wireless communication. It can be understood that the above modulation and demodulation processor 601 may not be integrated into the processor 601 either.

[0100] The memory 602 can be used to store software programs and modules. The processor 601 executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, computer programs required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the server. In addition, the memory can include high-speed random access memory and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory can also include a memory controller to provide the processor 601 with access to the memory.

[0101] The air conditioner further includes a power supply 603 for supplying power to each component. Preferably, the power supply 603 can be logically connected to the processor 601 through a power management system, so as to implement functions such as management of charging, discharging, and power consumption management through the power management system. The power supply can also include any components such as one or more DC or AC power supplies, a recharge system, a power failure detection circuit, a power converter or inverter, and a power status indicator.

[0102] The air conditioner may further include an input unit 604, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0103] Although not shown, the air conditioner may further include a display unit, etc., which will not be elaborated here. Specifically, in this embodiment, the processor 601 in the air conditioner will load the executable files corresponding to the processes of one or more computer programs into the memory 602 according to the following instructions, and the processor 601 will run the computer programs stored in the memory 602 to perform the following steps:

[0104] After the air conditioner is turned on and it is determined that the compressor is running normally, control the compressor to run at a first frequency for a first duration;

[0105] After the compressor runs at the first frequency for the first duration, determine the suction superheat degree according to the instantaneous current of the compressor and the indoor coil temperature;

[0106] After it is determined that the suction superheat degree is greater than or equal to a first preset value, determine whether the suction superheat degree is greater than a second preset value, where the second preset value is greater than the first preset value;

[0107] If the suction superheat degree is greater than the second preset value, it is determined that the air conditioner has a refrigerant leak.

[0108] By performing the above steps, the suction superheat is determined based on the instantaneous current of the compressor and the indoor coil temperature, and then whether the air conditioner has refrigerant leakage is determined according to the suction superheat; that is, the present invention can determine whether the air conditioner has leakage through the instantaneous current of the compressor and the indoor coil temperature, which can save the cost of multiple refrigerant sensors and reduce the refrigerant detection cost.

[0109] Those of ordinary skill in the art can understand that all or part of the steps in any of the above methods can be completed by a computer program or by controlling related hardware through a computer program. The computer program can be stored in a computer-readable storage medium and loaded and executed by the processor 601.

[0110] In some embodiments, the present invention also provides a storage medium storing a computer program, and the computer program is loaded and executed by a processor to perform the following steps:

[0111] After the air conditioner is turned on and it is determined that the compressor is running normally, control the compressor to run at a first frequency for a first duration;

[0112] After the compressor runs at the first frequency for the first duration, determine the suction superheat according to the instantaneous current of the compressor and the indoor coil temperature;

[0113] After it is determined that the suction superheat is greater than or equal to a first preset value, determine whether the suction superheat is greater than a second preset value, where the second preset value is greater than the first preset value;

[0114] If the suction superheat is greater than the second preset value, it is determined that the air conditioner has refrigerant leakage.

[0115] By performing the above steps, the suction superheat is determined based on the instantaneous current of the compressor and the indoor coil temperature, and then whether the air conditioner has refrigerant leakage is determined according to the suction superheat; that is, the present invention can determine whether the air conditioner has leakage through the instantaneous current of the compressor and the indoor coil temperature, which can save the cost of multiple refrigerant sensors and reduce the refrigerant detection cost.

[0116] Those of ordinary skill in the art can understand that any reference to a memory, storage, database, or other medium used in the embodiments provided by the present invention may include non-volatile and / or volatile memories. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0117] Since the computer program stored in this storage medium can execute the steps in the refrigerant leakage detection method in any one of the embodiments provided by the present invention, the beneficial effects achievable by the refrigerant leakage detection method in any one of the embodiments provided by the present invention can be realized. For details, see the previous embodiments and will not be elaborated here.

[0118] For the specific implementation of each of the above operations, reference can be made to the previous embodiments and will not be elaborated here.

[0119] In the above embodiments, the descriptions of the various embodiments each have their own focuses. For the parts not elaborated in a certain embodiment, reference can be made to the detailed descriptions of other embodiments above and will not be elaborated here.

[0120] The above are only optional embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the application concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A refrigerant leakage detection method, characterized in that: The refrigerant leakage detection method comprises: After the air conditioner is turned on and it is determined that the compressor is operating normally, controlling the compressor to operate at a first frequency for a first period of time; After the compressor runs at the first frequency for the first time period, determining the return air superheat according to the instantaneous current of the compressor and the indoor coil temperature; After determining that the return air superheat is greater than or equal to a first preset value, determining whether the return air superheat is greater than a second preset value, wherein the second preset value is greater than the first preset value; If the return air superheat is greater than the second preset value, it is determined that a refrigerant leak occurs in the air conditioner.

2. The refrigerant leakage detection method according to claim 1, characterized in that: The refrigerant leakage detection method further comprises: If the return air superheat is less than the first preset value, the compressor is controlled again to run at the first frequency for the first time period, and the return air superheat is determined again based on the instantaneous current of the compressor and the indoor coil temperature until the return air superheat is greater than or equal to the first preset value.

3. The refrigerant leakage detection method according to claim 1, characterized in that: Determining the return air superheat according to the instantaneous current of the compressor and the indoor coil temperature includes: Determining the evaporation saturation temperature according to the indoor coil temperature; Determining the return air temperature according to the evaporation saturation temperature and the instantaneous current of the compressor; The return air superheat is determined according to the return air temperature and the instantaneous current of the compressor.

4. The refrigerant leakage detection method according to claim 3, characterized in that: Determining the evaporation saturation temperature according to the indoor coil temperature includes: Determine the average temperature of the indoor coil within a preset time according to the indoor coil temperature; The evaporation saturation temperature is determined according to the average tube temperature.

5. The refrigerant leakage detection method according to claim 3, characterized in that: Determining the return air temperature according to the evaporation saturation temperature and the instantaneous current of the compressor includes: The return air temperature is determined according to the instantaneous current of the compressor, the reference current and the evaporation saturation temperature.

6. The refrigerant leakage detection method according to claim 1, characterized in that: The refrigerant leakage detection method further comprises: After determining that the air conditioner has a refrigerant leak, determining the indoor coil temperature change rate and the outdoor coil temperature change rate according to the indoor coil temperature and the outdoor coil temperature; The refrigerant leakage position of the air conditioner is determined according to the indoor coil temperature change rate and the outdoor coil temperature change rate.

7. The refrigerant leakage detection method according to claim 6, characterized in that: The step of determining the refrigerant leakage position of the air conditioner according to the indoor coil temperature change rate and the outdoor coil temperature change rate comprises: If the indoor coil temperature change rate is inconsistent with the first standard change rate, it is determined that the indoor heat exchanger coil is leaking; If the outdoor coil temperature change rate is inconsistent with the second standard change rate, it is determined that the outdoor heat exchanger coil is leaking.

8. A refrigerant leakage detection device, characterized in that: include: An acquisition module, used for acquiring instantaneous current of the compressor and indoor coil temperature; A judgment module, used to judge whether the return air superheat is greater than or equal to a first preset value; and used to determine whether the return air superheat is greater than a second preset value, wherein the second preset value is greater than the first preset value; and used to determine whether the return air superheat is greater than the second preset value; A control module, for controlling the compressor to run at a first frequency for a first period of time after the air conditioner is turned on and it is determined that the compressor is operating normally; and for determining the return air superheat according to the instantaneous current of the compressor and the indoor coil temperature after the compressor runs at the first frequency for the first period of time; and for determining that a refrigerant leak occurs in the air conditioner when the return air superheat is greater than the second preset value.

9. An air conditioner, characterized in that: The air conditioner includes a memory and a processor, the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the steps in the refrigerant leakage detection method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium stores a computer program, and the computer program is loaded and executed by the processor to execute the steps in the refrigerant leakage detection method according to any one of claims 1 to 7.

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