Anti-freezing control method and device for air conditioner, air conditioner and storage medium

Abstract

The application relates to the technical field of air conditioners, and discloses an anti-freezing control method for an air conditioner. Refrigerant flowing through a main refrigerant flow path flows into indoor heat exchange coils through an indoor heat exchanger inlet after being subjected to a flow splitting treatment. The method comprises the following steps: in the case that the air conditioner is operated in an anti-freezing mode, obtaining a temperature value of the indoor heat exchanger inlet and a temperature value of the indoor heat exchange coils; according to the matching condition of the temperature value of the indoor heat exchanger inlet and a first target temperature range and the matching condition of the temperature value of the indoor heat exchange coils and a second target temperature range, obtaining a target frequency of a compressor; and controlling the compressor to operate at the target frequency, so as to realize anti-freezing protection of the indoor heat exchanger. The application can comprehensively meet the anti-freezing requirements of the refrigerant inlet pipe and the middle coils of the indoor heat exchanger, and reduce the adverse effects of the anti-freezing protection operation on refrigeration of the air conditioner. The application further discloses an anti-freezing control device for an air conditioner, an air conditioner and a storage medium.

Description

Technical Field

[0001] This application relates to the field of air conditioner technology, such as an anti-freeze control method and device for air conditioners, an air conditioner, and a storage medium. Background Technology

[0002] Currently, when an air conditioner is running in cooling mode, if the indoor heat exchanger frosts or freezes, it will affect the air conditioner's cooling capacity, resulting in a decrease in cooling efficiency, or even the blowing of water or ice. Therefore, how to achieve anti-freeze protection when the air conditioner is running in cooling mode is a technical problem that urgently needs to be solved.

[0003] Related technology discloses a control method for air conditioner anti-freezing. The air conditioner includes an indoor heat exchanger and a compressor. A first sensor for detecting the refrigerant inlet pipe temperature is installed at the inlet of the indoor heat exchanger, and a second sensor for detecting the temperature of the middle pipe of the indoor heat exchanger is installed in the middle section. The control method includes: acquiring the refrigerant inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger when the air conditioner is operating in cooling mode; determining whether a preset anti-freezing condition is met based on the minimum pipe temperature between the refrigerant inlet pipe temperature and the middle pipe temperature; and, in response to the minimum pipe temperature meeting the preset anti-freezing condition, determining and controlling the air conditioner to switch to the corresponding anti-freezing mode based on the minimum pipe temperature. Wherein, if the minimum pipe temperature meets the first temperature condition, the anti-freezing mode includes reducing the compressor frequency. Thus, the above control method adds a temperature sensor at the refrigerant inlet pipe of the indoor heat exchanger to detect the refrigerant inlet pipe temperature before the refrigerant flows into the multiple heat exchange pipes of the indoor heat exchanger. Furthermore, the minimum pipe temperature among the refrigerant inlet pipe temperature and the middle pipe temperature of the indoor heat exchanger is used to determine the anti-freezing condition, which effectively improves the real-time sensing of the overall temperature status of the indoor heat exchanger and can also respond promptly to the freezing of local heat exchange pipes in the indoor heat exchanger.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] When the air conditioner is running in cooling mode, the refrigerant inlet pipe temperature is lower than the middle coil temperature. The anti-freezing requirements for the refrigerant inlet pipe and the middle coil of the indoor heat exchanger differ, resulting in situations where the refrigerant inlet pipe requires anti-freezing protection while the middle coil of the indoor heat exchanger does not. In this case, if anti-freezing protection is triggered, it will reduce the heat exchange capacity of the indoor heat exchanger, affecting the air conditioner's cooling performance.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides an anti-freeze control method, apparatus, air conditioner, and storage medium for an air conditioner, which integrates the anti-freeze requirements of the refrigerant inlet pipe and the central coil of the indoor heat exchanger, and reduces the adverse effects of performing anti-freeze protection operations on the air conditioner's cooling performance.

[0009] In some embodiments, the refrigerant flowing through the main refrigerant flow path is diverted and then flows into the indoor heat exchange coil through the indoor heat exchanger inlet. The method includes: when the air conditioner is operating in anti-freeze mode, obtaining the temperature value of the indoor heat exchanger inlet and the temperature value of the indoor heat exchange coil; obtaining the target frequency of the compressor based on the matching of the indoor heat exchanger inlet temperature value and a first target temperature range, and the matching of the indoor heat exchange coil temperature value and a second target temperature range; and controlling the compressor to operate at the target frequency to achieve anti-freeze protection of the indoor heat exchanger.

[0010] In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to execute, when running the program instructions, the antifreeze control method for an air conditioner as described above.

[0011] In some embodiments, the air conditioner includes: a main refrigerant flow path, configured with a first sensor for detecting the temperature value at the inlet of the indoor heat exchanger; an indoor heat exchanger, configured with an indoor heat exchange coil and a second sensor for detecting the temperature value of the indoor heat exchange coil, wherein refrigerant flowing through the main refrigerant flow path passes through the inlet of the indoor heat exchanger and is diverted to flow into the indoor heat exchange coil to achieve heat exchange; and an anti-freeze control device for the air conditioner as described above is installed in the indoor heat exchanger.

[0012] In some embodiments, the storage medium stores program instructions that, when executed, perform the anti-freeze control method for an air conditioner as described above.

[0013] The anti-freezing control method, apparatus, air conditioner, and storage medium for air conditioners provided in this disclosure can achieve the following technical effects:

[0014] This embodiment of the disclosure can determine whether anti-freeze protection is required for the indoor heat exchanger inlet based on the matching of the indoor heat exchanger inlet temperature value with a first target temperature range, and determine whether anti-freeze protection is required for the indoor heat exchanger coil based on the matching of the indoor heat exchanger coil temperature with a second target temperature range. The target frequency of the compressor is then determined by combining the above matching conditions, ensuring that the compressor's operating frequency can accommodate the anti-freeze protection requirements of both the indoor heat exchanger inlet and the indoor heat exchanger coil, thereby reducing the adverse effects on air conditioner cooling caused by anti-freeze protection operations.

[0015] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0017] Figure 1 This is a schematic diagram of the structure of an air conditioner provided in an embodiment of this disclosure;

[0018] Figure 2 This is a schematic diagram of an anti-freezing control method for an air conditioner provided in an embodiment of this disclosure;

[0019] Figure 3 This is a schematic diagram of another anti-freezing control method for an air conditioner provided in an embodiment of this disclosure;

[0020] Figure 4 This is a schematic diagram of another anti-freezing control method for an air conditioner provided in an embodiment of this disclosure;

[0021] Figure 5 This is a schematic diagram of another anti-freezing control method for an air conditioner provided in an embodiment of this disclosure;

[0022] Figure 6 This is a schematic diagram of an anti-freeze control device for an air conditioner provided in an embodiment of this disclosure;

[0023] Figure 7 This is a schematic diagram of an air conditioner provided in an embodiment of this disclosure.

[0024] Figure label:

[0025] 10: Main refrigerant flow path; 10a: First sensor;

[0026] 20: Indoor heat exchanger; 20a: Second sensor;

[0027] 30: First distributor;

[0028] 40: Second distributor;

[0029] 300: Anti-freeze control device for air conditioners;

[0030] 400: Processor; 401: Memory; 402: Communication interface; 403: Bus;

[0031] 600: Air conditioner. Detailed Implementation

[0032] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0033] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0034] Unless otherwise stated, the term "multiple" means two or more.

[0035] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0036] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0037] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0038] Combination Figure 1As shown, this embodiment of the present disclosure provides an air conditioner, including an indoor unit and an outdoor unit. The outdoor unit includes a compressor and a main refrigerant flow path 10. The main refrigerant flow path 10 is equipped with a first sensor 10a. The indoor unit includes multiple indoor heat exchangers 20. Each indoor heat exchanger 20 is equipped with an indoor heat exchange coil and a second sensor 20a for detecting the temperature value of the indoor heat exchange coil. The refrigerant flowing through the main refrigerant flow path 10 enters the indoor heat exchanger inlet and is then diverted before flowing into the indoor heat exchange coil. Both the first sensor 10a and the second sensor 20a are temperature sensors. Optionally, the main refrigerant flow path 10, after entering the indoor heat exchanger inlet, is diverted by a first distributor 30 and then flows into the indoor heat exchange coil. The refrigerant flowing through the indoor heat exchange coil undergoes heat exchange treatment and is then merged by a second distributor 40 before flowing back into the main refrigerant flow path 10. Optionally, the first sensor 10a is installed at the inlet of the first distributor 30, and the first sensor 10a is used to detect the temperature value at the inlet of the indoor heat exchanger 20.

[0039] The air conditioner provided in this embodiment uses a first sensor to obtain the temperature value of the inlet of the indoor heat exchanger, thus obtaining the temperature of the pipes flowing into the indoor heat exchanger. Simultaneously, a second sensor obtains the temperature value of the indoor heat exchange coil, thus obtaining the temperature of the indoor heat exchanger itself. In this way, this embodiment can combine the temperature conditions before and after refrigerant diversion, improving the accuracy of temperature detection.

[0040] Combination Figure 2 As shown, this disclosure provides an anti-freezing control method for an air conditioner, including:

[0041] S01, when the air conditioner is running in anti-freeze mode, the processor obtains the temperature value of the indoor heat exchanger inlet and the temperature value of the indoor heat exchanger coil.

[0042] S02, the processor obtains the target frequency of the compressor based on the matching of the indoor heat exchanger inlet temperature value with the first target temperature range and the matching of the indoor heat exchange coil temperature value with the second target temperature range.

[0043] S03, the processor controls the compressor to run at the target frequency to achieve anti-freeze protection for the indoor heat exchanger.

[0044] The anti-freeze control method for air conditioners provided in this disclosure can determine whether anti-freeze protection is needed at the indoor heat exchanger inlet based on the matching of the indoor heat exchanger inlet temperature with a first target temperature range, and determine whether anti-freeze protection is needed for the indoor heat exchanger coil based on the matching of the indoor heat exchanger coil temperature with a second target temperature range. The target frequency of the compressor is then determined by combining the above matching conditions, ensuring that the compressor's operating frequency meets the anti-freeze protection requirements of both the indoor heat exchanger inlet and the indoor heat exchanger coil, thereby reducing the adverse effects on air conditioner cooling caused by anti-freeze protection operations.

[0045] Combination Figure 3 As shown, the processor obtains the compressor's target frequency based on the matching between the indoor heat exchanger inlet temperature and the first target temperature range, and the matching between the indoor heat exchange coil temperature and the second target temperature range, including:

[0046] S11, the processor determines the first frequency change rate based on the matching of the temperature value at the inlet of the indoor heat exchanger with the first target temperature range.

[0047] S12, the processor determines the second frequency change rate based on the matching of the indoor heat exchange coil temperature value with the second target temperature range.

[0048] S13, the processor obtains the target frequency of the compressor based on the current frequency, the first frequency change rate, and the second frequency change rate.

[0049] Among them, T imin T imax These represent the lower and upper threshold values ​​of the first target temperature range, respectively. T pmin T pmax These represent the lower and upper threshold values ​​of the second target temperature range, respectively. First target temperature range = [T] imin ,T imax ), second target temperature range = [T pmin ,T pmax ), T pmin =T imin - T, T pmax =T imax - T, T represents T pmin With T imin The difference, and represent T pmax With T imax The difference and T>0℃.

[0050] Thus, when the air conditioner is operating in cooling mode, the temperature at the indoor heat exchanger inlet is lower than the temperature of the indoor heat exchanger coil. Therefore, different target temperature ranges are set for the indoor heat exchanger inlet and the indoor heat exchanger coil. Simultaneously, the upper threshold of the first target temperature range is higher than the upper threshold of the second target temperature range, and the lower threshold of the first target temperature range is higher than the lower threshold of the second target temperature range. Compared to control methods used in related technologies, this avoids premature triggering of anti-freeze protection.

[0051] It should be noted that, because the inlet temperature of the indoor heat exchanger is not equal to the temperature of the indoor heat exchange coil, in cooling mode, the inlet temperature of the indoor heat exchanger is lower than the temperature of the indoor heat exchange coil. If T... imin With T imax Setting a small target temperature range, or setting the same target temperature range for both the indoor heat exchanger inlet and the indoor heat exchanger coil, will prematurely trigger anti-freeze protection. Therefore, this embodiment sets different target temperature ranges for the indoor heat exchanger inlet and the indoor heat exchanger coil. Meanwhile, T imin Higher than T pmin And T imax Higher than T pmax This is to avoid prematurely triggering the anti-freeze protection.

[0052] Optionally, 2℃≤ T≤3℃. It should be noted that... The specific value of T can be set according to the actual anti-freeze requirements.

[0053] Optionally, combined Figure 4 As shown, the processor obtains the compressor's target frequency based on the current frequency, the first frequency change rate, and the second frequency change rate, including:

[0054] S21, the processor adjusts the current frequency according to the first frequency change rate to obtain the first frequency.

[0055] In this step, the first frequency change rate is greater than zero and less than or equal to 0.5 Hz / s.

[0056] S22, the processor adjusts the current frequency according to the second frequency change rate to obtain the second frequency.

[0057] In this step, the second frequency change rate is greater than zero and less than or equal to 0.5 Hz / s.

[0058] S23, the processor selects the minimum value between the first frequency and the second frequency as the target frequency of the compressor.

[0059] As an example, the first frequency change rate is 0.2 Hz / s. The second frequency change rate is 0.5 Hz / s. The processor adjusts the current frequency according to the first frequency change rate to obtain the first frequency, including: the processor decreasing the current frequency by 0.2 Hz / s to obtain the first frequency. The processor adjusts the current frequency according to the second frequency change rate to obtain the second frequency, including: the processor decreasing the current frequency by 0.5 Hz / s to obtain the second frequency.

[0060] Thus, in this embodiment, the current frequency is adjusted according to a first frequency change rate to obtain a first frequency, and the current frequency is adjusted according to a second frequency change rate to obtain a second frequency. The minimum of the two is selected as the target frequency of the compressor. When the air conditioner is in low-temperature cooling mode, if the maximum of the two values ​​is selected as the target frequency of the compressor, the compressor frequency will decrease too quickly, resulting in a significant deterioration in cooling performance. Therefore, in this embodiment, under low-temperature cooling conditions, the minimum of the two values ​​is selected as the target frequency of the compressor, achieving a small adjustment of the compressor frequency. This balances the anti-freezing protection requirements of both the indoor heat exchanger inlet and the indoor heat exchange coil, ensuring the cooling effect of the air conditioner.

[0061] Optionally, the processor determines the first frequency change rate based on the matching between the indoor heat exchanger inlet temperature and the first target temperature range, including:

[0062] Processor in T imin ≤T i <T imax In this case, the rate of change of the first frequency is determined to be 0.

[0063] Processor in T limin ≤T i <T imin In this case, the rate of change of the first frequency is determined. f.

[0064] Processor in T i <T limin In this case, determine that the compressor should be shut down.

[0065] Among them, T i This indicates the temperature value at the inlet of the indoor heat exchanger, T. limin This represents the first lower limit critical value.

[0066] Thus, in T imin ≤T i <T imax This indicates that the temperature at the indoor heat exchanger inlet is within the first target temperature range, eliminating the need for anti-freeze protection and compressor frequency adjustment. At T... limin ≤T i <T iminWhen the temperature at the inlet of the indoor heat exchanger is lower than the lower limit threshold of the first target temperature range but greater than or equal to the first lower limit critical value, it is necessary to fine-tune the compressor frequency to achieve anti-freeze protection at the inlet of the indoor heat exchanger, and determine the first frequency change rate. f. In T i <T limin When the temperature at the inlet of the indoor heat exchanger is lower than the first lower limit threshold, it indicates that the temperature at the inlet of the indoor heat exchanger is extremely low. At this time, it is not advisable to continue running the cooling mode. Therefore, the compressor is shut down. Thus, this embodiment of the present disclosure can set the frequency change rate based on the matching between the temperature at the inlet of the indoor heat exchanger and the first target temperature range and the first lower limit threshold, thereby achieving precise adjustment of the compressor frequency at the inlet of the indoor heat exchanger.

[0067] Optionally, the processor determines the second frequency change rate based on the matching between the indoor heat exchange coil temperature and the second target temperature range, including:

[0068] Processor in T pmin ≤T p <T pmax In this case, the rate of change of the second frequency is determined to be 0.

[0069] Processor in T lpmin ≤T p <T pmin In this case, determine the rate of change of the second frequency. f.

[0070] Processor in T p <T lpmin In this case, determine that the compressor should be shut down.

[0071] Among them, T p This indicates the temperature value of the indoor heat exchange coil, T. lpmin Indicates the second lower limit critical value and T lpmin =T limin - T.

[0072] Thus, in T pmin ≤T p <T pmax This indicates that the temperature of the indoor heat exchange coil is within the second target temperature range, requiring no anti-freeze protection and no adjustment of the compressor frequency. At T... lpmin ≤T p <T pmin When the temperature of the indoor heat exchange coil is below the lower limit threshold of the second target temperature range but greater than or equal to the second lower limit critical value, it is necessary to fine-tune the compressor frequency to achieve anti-freeze protection for the indoor heat exchange coil and determine the second frequency change rate. f. In Tp <T lpmin When the temperature of the indoor heat exchange coil is lower than the second lower limit threshold, it indicates that the temperature of the indoor heat exchange coil is extremely low. At this time, it is not advisable to continue running the cooling mode. Therefore, the compressor is shut down. Thus, this embodiment of the present disclosure can set the frequency change rate based on the matching between the temperature of the indoor heat exchange coil and the second target temperature range and the second lower limit threshold, thereby achieving precise adjustment of the compressor frequency of the indoor heat exchange coil.

[0073] Combination Figure 5 As shown, this disclosure provides another anti-freezing control method for air conditioners, including:

[0074] S31, when the air conditioner is running in anti-freeze mode, the processor obtains the temperature value of the indoor heat exchanger inlet and the temperature value of the indoor heat exchanger coil.

[0075] S32, the processor obtains the target frequency of the compressor based on the matching of the temperature value of the indoor heat exchanger inlet with the first target temperature range and the matching of the temperature value of the indoor heat exchanger coil with the second target temperature range.

[0076] S33, the processor controls the compressor to operate at a target frequency to achieve anti-freeze protection for the indoor heat exchanger.

[0077] S34, the processor re-acquires the new temperature value of the indoor heat exchanger inlet and the new temperature value of the indoor heat exchanger coil.

[0078] S35, the processor's new temperature value at the indoor heat exchanger inlet is greater than or equal to T. imax +2℃ and the new temperature of the indoor heat exchange coil is greater than or equal to T. imax - At T+2℃, the anti-freeze mode will be stopped.

[0079] The anti-freeze control method for air conditioners provided in this disclosure embodiment continuously monitors the temperature value at the inlet of the indoor heat exchanger and the temperature value of the indoor heat exchange coil after controlling the compressor to run at the target frequency, and only monitors the temperature value at the inlet of the indoor heat exchanger when the new temperature value is greater than or equal to T. imax +2℃ and the new temperature of the internal heat exchange coil is greater than or equal to T. imax - At T+2℃, it was confirmed that anti-freeze protection at the indoor heat exchanger inlet and the indoor heat exchanger coil had been successfully achieved. Therefore, the anti-freeze mode was discontinued. Thus, this embodiment of the present disclosure can provide anti-freeze protection for air conditioners operating under low-temperature cooling conditions, based on the anti-freeze requirements reflected by the temperature values ​​at the indoor heat exchanger inlet and the indoor heat exchanger coil, thereby preventing frost or even freezing of the indoor heat exchanger and minimizing the adverse effects of frost or freezing on the air conditioner's cooling performance.

[0080] Optionally, the processor determines whether the air conditioner should operate in anti-freeze mode as follows:

[0081] The processor obtains the outdoor temperature value T. ao ;

[0082] Processor in T ao ≤T threshold In this case, execute the anti-freeze mode.

[0083] Among them, 8℃≤T threshold ≤16℃.

[0084] Thus, in embodiments of this disclosure, when the outdoor temperature is low, for example, when the air conditioner is installed in spaces with cooling needs such as monitoring rooms and control rooms, excessively high indoor fan speeds can cause discomfort to users in these spaces. Therefore, to ensure user comfort, the indoor fan speed is set to a low value. In this situation, low indoor fan speed operation can lead to insufficient heat exchange in the indoor heat exchanger, making it prone to frost or even ice formation. Therefore, embodiments of this disclosure... ao ≤T threshold When this occurs, the anti-freeze mode is activated to prevent the indoor heat exchanger from freezing as described above.

[0085] In practical applications, the anti-freeze control method for air conditioners specifically implements the following steps:

[0086] S101: When the air conditioner is operating in anti-freeze mode, the processor obtains the temperature value T at the inlet of the indoor heat exchanger. i and the temperature value T of the indoor heat exchange coil p .

[0087] S102: Confirmed, T limin ≤T i <T imin Then the rate of change of the first frequency is determined to be f, and according to f adjusts the current frequency to obtain the first frequency.

[0088] S103: Confirmed, T pmin ≤T p<T pmax If the rate of change of the second frequency is determined to be 0, then the current frequency is determined as the second frequency.

[0089] S104: The processor selects the minimum value between the first frequency and the second frequency as the target frequency and controls the compressor to run at the target frequency to achieve anti-freeze protection for the indoor heat exchanger.

[0090] S105: The processor reacquires the new temperature value T at the indoor heat exchanger inlet. i *and the new temperature value T for the indoor heat exchange coil. p *

[0091] S106, confirmed, T i *≥T imax +2℃ and T p *≥T imax - If the temperature is T+2℃, the anti-freeze mode will be deactivated.

[0092] Combination Figure 6 As shown, this disclosure provides an anti-freeze control device 300 for an air conditioner, including a processor 400 and a memory 401. Optionally, the device may further include a communication interface 402 and a bus 403. The processor 400, communication interface 402, and memory 401 can communicate with each other via the bus 403. The communication interface 402 can be used for information transmission. The processor 400 can call logical instructions in the memory 401 to execute the anti-freeze control method for an air conditioner described in the above embodiment.

[0093] Furthermore, the logic instructions in the aforementioned memory 401 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0094] The memory 401, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 400 executes functional applications and data processing by running the program instructions / modules stored in the memory 401, thereby implementing the anti-freezing control method for air conditioners in the above embodiments.

[0095] The memory 401 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 401 may include high-speed random access memory and may also include non-volatile memory.

[0096] Combination Figure 7 As shown, this disclosure provides an air conditioner 600, including: a main refrigerant flow path, an indoor heat exchanger, and the aforementioned anti-freeze control device 300 for the air conditioner. The main refrigerant flow path is equipped with a first sensor for detecting the temperature value at the inlet of the indoor heat exchanger. The indoor heat exchanger is equipped with an indoor heat exchange coil and a second sensor for detecting the temperature value of the indoor heat exchange coil. The refrigerant flowing through the main refrigerant flow path passes through the inlet of the indoor heat exchanger and is then diverted into the indoor heat exchange coil to achieve heat exchange. The anti-freeze control device 300 for the air conditioner is installed in the indoor heat exchanger. The installation relationship described herein is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the anti-freeze control device 300 for the air conditioner can be adapted to feasible product bodies to achieve other feasible embodiments.

[0097] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described anti-freezing control method for an air conditioner.

[0098] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0099] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0100] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0101] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0102] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0103] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for preventing freezing in air conditioners, characterized in that, The refrigerant flowing through the main refrigerant path passes through the inlet of the indoor heat exchanger and is then diverted into the indoor heat exchange coil. The method includes: When the air conditioner is running in anti-freeze mode, obtain the temperature value of the indoor heat exchanger inlet and the temperature value of the indoor heat exchanger coil. The target frequency of the compressor is obtained based on the matching between the temperature value at the inlet of the indoor heat exchanger and the first target temperature range, as well as the matching between the temperature value of the indoor heat exchange coil and the second target temperature range. Control the compressor to operate at the target frequency to achieve anti-freeze protection for the indoor heat exchanger; The step of obtaining the compressor's target frequency based on the matching between the indoor heat exchanger inlet temperature and the first target temperature range, and the matching between the indoor heat exchange coil temperature and the second target temperature range, includes: The first frequency change rate is determined based on the matching between the temperature value at the inlet of the indoor heat exchanger and the first target temperature range; The second frequency change rate is determined based on the matching between the indoor heat exchange coil temperature and the second target temperature range; The current frequency is adjusted according to the first frequency change rate to obtain the first frequency; The current frequency is adjusted according to the rate of change of the second frequency to obtain the second frequency; The minimum value between the first frequency and the second frequency is selected as the target frequency of the compressor. Wherein, the first target temperature range = [T imin ,T imax ), second target temperature range = [T pmin ,T pmax ), T pmin =T imin - T, T pmax =T imax - T, T>0℃.

2. The method according to claim 1, characterized in that, The step of determining the first frequency change rate based on the matching between the indoor heat exchanger inlet temperature and the first target temperature range includes: In T imin ≤T i <T imax In this case, the rate of change of the first frequency is determined to be 0; In T limin ≤T i <T imin In this case, the rate of change of the first frequency is determined. f; In T i <T limin In this case, determine that the compressor should be shut down; Among them, T i This indicates the temperature value at the inlet of the indoor heat exchanger, T. limin This represents the first lower limit critical value.

3. The method according to claim 1, characterized in that, The step of determining the second frequency change rate based on the matching between the indoor heat exchange coil temperature and the second target temperature range includes: In T pmin ≤T p <T pmax In this case, the rate of change of the second frequency is determined to be 0; In T lpmin ≤T p <T pmin In this case, determine the rate of change of the second frequency. f; In T p <T lpmin In this case, determine that the compressor should be shut down; Among them, T p This indicates the temperature value of the indoor heat exchange coil, T. lpmin Indicates the second lower limit critical value and T lpmin =T limin - T.

4. The method according to claim 1, characterized in that, 2℃≤ T≤3℃。 5. The method according to any one of claims 1 to 4, characterized in that, After the compressor is controlled to operate at the target frequency, the following is also included: Retrieve the new temperature values ​​of the indoor heat exchanger inlet and the indoor heat exchanger coils; The new temperature value at the inlet of the indoor heat exchanger is greater than or equal to T. imax +2℃ and the new temperature of the indoor heat exchange coil is greater than or equal to T. imax - At T+2℃, the anti-freeze mode will be stopped.

6. An anti-freeze control device for an air conditioner, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running the program instructions, the anti-freezing control method for an air conditioner as described in any one of claims 1 to 5.

7. An air conditioner, characterized in that, include: The main refrigerant flow path is equipped with a first sensor for detecting the temperature value at the inlet of the indoor heat exchanger; The indoor heat exchanger is equipped with an indoor heat exchange coil and a second sensor for detecting the temperature of the indoor heat exchange coil. Refrigerant flowing through the main refrigerant path enters the indoor heat exchanger inlet and is then diverted before flowing into the indoor heat exchange coil to achieve heat exchange. The anti-freeze control device for an air conditioner as described in claim 6 is installed in the indoor heat exchanger.

8. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the anti-freezing control method for air conditioners as described in any one of claims 1 to 5.

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