CN112556095A

CN112556095A - Method and device for preventing air conditioner evaporator from freezing and air conditioner

Info

Publication number: CN112556095A
Application number: CN202011335596.2A
Authority: CN
Inventors: 张强; 孙治国; 王秀霞
Original assignee: Zhengzhou Haier Air Conditioner Co ltd
Current assignee: Zhengzhou Haier Air Conditioner Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-03-26

Abstract

The application relates to the technical field of intelligent household appliances and discloses a method for preventing an air conditioner evaporator from freezing. The coils are respectively arranged on a plurality of flow paths of the evaporator, and after the temperatures of the coils are obtained, a first target temperature is selected to represent the current integral icing condition of the evaporator. When the first target temperature meets the anti-freezing condition, the air conditioner can be controlled to execute an anti-freezing protection mode corresponding to the first target temperature, so that the anti-freezing protection of the evaporator of the air conditioner can be still performed when the temperature of the single flow path of the air conditioner is too high. The application also discloses a device and an air conditioner for preventing the air conditioner evaporator from freezing.

Description

Method and device for preventing air conditioner evaporator from freezing and air conditioner

Technical Field

The application relates to the technical field of intelligent household appliances, in particular to a method and a device for preventing an air conditioner evaporator from freezing and an air conditioner.

Background

In the prior art, when an air conditioner works in a refrigeration or dehumidification mode, the air conditioner needs to be protected from freezing, in the prior art, a plurality of freezing protection temperatures are set, when a coil sensor detects that different freezing protection temperatures are reached, the air conditioner enters different processing stages of freezing protection, and a compressor is subjected to frequency reduction or shutdown. And when the temperature of the coil pipe rises to different recovery temperatures, the operation of the refrigeration or dehumidification mode is recovered.

In the practical application process, the number of the evaporator branches is usually N, the evaporator coil of the indoor unit is usually only one and is only placed on a single flow path, the integral icing condition of the evaporator cannot be reflected only through the temperature change condition of the single flow path, and the anti-freezing protection effect of the air conditioner is limited, so that the refrigeration and dehumidification effects are influenced, and even the condition that the indoor unit is damaged due to the fact that the indoor unit is excessively iced and dropped can occur possibly.

Disclosure of Invention

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

The embodiment of the disclosure provides a method and a device for preventing an evaporator of an air conditioner from freezing and the air conditioner, and aims to solve the technical problems that when the temperature of a flow path is too high due to differences of different working conditions, air volume distribution and the like of an internal machine evaporator, the detected temperature of a coil cannot reflect the integral freezing condition of the evaporator, and the anti-freezing protection of the air conditioner cannot be performed.

In some embodiments, the method comprises: obtaining temperatures of a plurality of coils; determining a first target temperature from the temperatures of the plurality of coils; and when the first target temperature meets the preset anti-freezing condition, controlling the air conditioner to execute an anti-freezing protection mode associated with the first target temperature.

In some embodiments, the apparatus comprises: an obtaining module configured to obtain temperatures of a plurality of coils; a determination module configured to determine a first target temperature from the temperatures of the plurality of coils; and the control module is configured to control the air conditioner to execute an anti-freezing protection mode associated with the first target temperature when the target temperature meets a preset anti-freezing condition.

In some embodiments, the apparatus comprises: a processor and a memory storing program instructions, the processor being configured to, upon execution of the program instructions, perform the aforementioned method for anti-freeze protection of an air conditioner evaporator.

In some embodiments, the air conditioner includes: the device for preventing the air conditioner evaporator from freezing is disclosed.

The method and the device for preventing the air conditioner evaporator from freezing and the air conditioner provided by the embodiment of the disclosure can realize the following technical effects: the coils are respectively arranged on a plurality of flow paths of the evaporator, and after the temperatures of the coils are obtained, a first target temperature is selected to represent the current integral icing condition of the evaporator. When the first target temperature meets the anti-freezing condition, the air conditioner can be controlled to execute an anti-freezing protection mode corresponding to the first target temperature, so that the anti-freezing protection of the evaporator of the air conditioner can be still performed when the temperature of the single flow path of the air conditioner is too high.

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

Drawings

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

FIG. 1 is a schematic diagram of a method for freeze protection of an air conditioner evaporator according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a coil placement location provided by embodiments of the present disclosure;

FIG. 3 is a schematic view of an apparatus for providing anti-freeze protection for an air conditioner evaporator according to an embodiment of the present disclosure;

fig. 4 is a schematic view of another device for anti-freeze protection of an air conditioner evaporator according to an embodiment of the disclosure.

Reference numerals:

1: a second coiled tube; 2: a first coil.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

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

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

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

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

Fig. 1 is a schematic view of a method for preventing freezing of an air conditioner evaporator according to an embodiment of the present disclosure, and in conjunction with fig. 1, the embodiment of the present disclosure provides a method for preventing freezing of an air conditioner evaporator, including:

and S11, obtaining the temperatures of the plurality of coils.

S12, a first target temperature is determined according to the temperatures of the plurality of coils.

And S13, controlling the air conditioner to execute an anti-freezing protection mode associated with the first target temperature when the first target temperature meets the preset anti-freezing condition.

The air conditioner in the embodiment of the present disclosure may be a hanging type air conditioner, a cabinet type air conditioner, etc., or any combination thereof.

In step 11, the temperatures of a plurality of coils are acquired.

In the scheme, when the air conditioner is in a low-temperature state for refrigerating operation, the surface of the indoor evaporator is frosted, and when the temperature of the indoor heat exchanger is reduced to be below 0 ℃ and lasts for a period of time, the outdoor unit stops operating. In order to prevent the evaporator from freezing due to too low temperature, the running condition of the air conditioner can be determined by acquiring the temperatures of the plurality of coil pipes, and then whether the air conditioner needs to be protected against freezing is judged. Thereby avoiding the damage of the air conditioner caused by the long-time operation of the air conditioner under the low temperature state.

In step 12, a first target temperature may be determined based on the temperatures of the plurality of coils.

In the scheme, after the temperatures of the plurality of coils are obtained, in order to determine whether the evaporator of the current air conditioner needs to be protected against freezing, a first target temperature capable of representing the freezing condition of the current air conditioner needs to be determined in the temperatures of the plurality of coils. In one example, the first target temperature may be determined based on the temperature of the individual coils under standard operating conditions, e.g., ambient temperature not less than 30 ℃. Under low-temperature working conditions, for example, when the ambient temperature is lower than 30 ℃, in order to avoid the situation that the temperature of the first coil is too high to represent the freezing condition of the current air-conditioning evaporator, the first target temperature can be determined according to the temperatures of the plurality of coils. Therefore, the accuracy of data acquisition is ensured, and the situation that the user is influenced due to untimely anti-freezing protection caused by data acquisition errors is prevented.

In step 13, when the first target temperature meets a preset anti-freezing condition, controlling the air conditioner to execute an anti-freezing protection mode associated with the first target temperature.

In the scheme, the anti-freezing condition can be preset for the air conditioning evaporator when the air conditioning equipment leaves the factory.

In one example, a reference value of the coil temperature may be preset in advance, and it may be determined that the air conditioner evaporator satisfies a preset anti-freezing condition when the first target temperature is not higher than the preset reference value.

In another example, according to the usage situation of the air conditioner, when the anti-freezing protection of the evaporator of the air conditioner is required, the time required for the anti-freezing protection of the evaporator is preset in advance, and when the time is reached, it is determined that the evaporator of the air conditioner meets the preset anti-freezing condition.

In both the above two modes, the air conditioner is controlled to execute the anti-freezing protection mode associated with the first target temperature under the condition that the anti-freezing condition is met.

In the technical solution provided in the embodiment of the present disclosure, the anti-freeze protection mode associated with the first target temperature is different according to the difference of the first target temperature. Specifically, when the determined first target temperature is less than 3 ℃, the frequency of the air conditioner compressor may be controlled to decrease at a rate of 1HZ per second. When the determined first target temperature is greater than 3 ℃ and less than 5 ℃, the frequency of the air conditioner compressor may be controlled to decrease at a rate of 0.1HZ per second. When the determined first target temperature is greater than 5 ℃ and less than 6 ℃, the frequency of the air conditioner compressor may be controlled to remain unchanged. When the determined first target temperature is greater than 6 ℃ and less than 9 ℃, the frequency of the air conditioner compressor may be controlled to increase at a rate of 0.1HZ per second. It can be understood that the threshold value for determining the anti-freezing protection mode associated with the first target temperature, the frequency adjustment value of the air conditioner compressor in the anti-freezing protection mode, and the like may be determined according to actual usage requirements, and this may not be specifically limited by the embodiment of the present disclosure.

By adopting the method for preventing the air conditioner evaporator from freezing provided by the embodiment of the disclosure, the coils are respectively arranged on the plurality of flow paths of the evaporator, and after the temperatures of the plurality of coils are obtained, the first target temperature is selected to represent the current integral icing condition of the evaporator. When the first target temperature meets the anti-freezing condition, the air conditioner can be controlled to execute an anti-freezing protection mode corresponding to the first target temperature, so that the anti-freezing protection of the evaporator of the air conditioner can be still performed when the temperature of the single flow path of the air conditioner is too high.

Alternatively, in order to obtain a coil temperature that can characterize an evaporator freeze condition, of the temperatures of the plurality of coils, the lowest coil temperature may be determined as the first target temperature.

For example, three coils are provided on the evaporator, and the temperatures of the three coils are taken to be 5 ℃, 7 ℃ and 3 ℃, respectively. The determination of 3 c is determined as the first target temperature of the air conditioner evaporator. By the scheme, when the temperatures of the other two coils are too high, the first target temperature can be accurately determined to perform anti-freezing protection on the air conditioner evaporator.

Alternatively, in order to determine the arrangement positions of the plurality of coils, in this embodiment, the plurality of coils may be arranged on different flow paths, and when the number of coils is two, the first coil is arranged at the lower part of the evaporator, and the second coil is arranged at the middle part of the evaporator.

Fig. 2 is a schematic diagram of a coil arrangement position provided by an embodiment of the present disclosure, and in this scheme, as shown in fig. 2, since the flow directions of the refrigerant in the cooling mode and the heating mode are opposite in the evaporator, the optimal coil temperature representing the refrigeration condition of the evaporator can be obtained by arranging the first coil 2 and the second coil 1 at the lower part and the middle part of the evaporator. Specifically, when the ambient temperature is not lower than 30 ℃, the anti-freezing protection can be performed through an anti-freezing mode corresponding to the temperature of the first coil 2. When the ambient temperature is lower than 30 ℃, the anti-freezing protection can be carried out through an anti-freezing protection mode corresponding to the lowest temperature value of the first coil 2 and the second coil 1.

Optionally, in order to obtain an accurate coil temperature, in the present embodiment, the temperatures of the plurality of coils are obtained when the compressor of the air conditioner operates for a first preset time.

In this scheme, confirmed the trigger condition who obtains a plurality of coil pipe temperatures, guaranteed to carry out the acquirement of coil pipe temperature at reasonable time, guaranteed the validity that data acquisition has prevented that interior coil pipe temperature sensor from avoiding extravagant resource because of acquireing the influence of temperature data to self life-span many times, effectively practiced thrift the electric energy.

Further, in order to avoid the limited anti-freezing protection effect of the air conditioner evaporator, the first target temperature can be determined according to the working condition of the evaporator in the scheme.

In one example, the condition that the ambient temperature is lower than the preset temperature can be determined as a special condition by a preset temperature value, for example, the preset temperature is set to 30 ℃, and when the ambient temperature of the evaporator is lower than 30 ℃, a plurality of coil temperatures are obtained. With this scheme, can acquire the temperature of a plurality of coils when the ambient temperature of evaporimeter work is less than the default, guarantee the accuracy that data acquisition.

Optionally, when the ambient temperature is not lower than the preset temperature, the temperature of the second coil pipe is obtained, and anti-freezing protection is performed according to the temperature of the second coil pipe.

For example, when the obtained ambient temperature is 40 ℃, the temperature of the second coil is obtained, and an anti-freezing protection mode associated with the temperature of the second coil is executed, so that the anti-freezing protection effect of the evaporator is ensured, and the condition that the evaporator freezes to damage the internal machine is prevented.

Optionally, after the air conditioner executes the anti-freezing protection mode, in order to determine the current state of the evaporator, when the air conditioner operates in the anti-freezing protection mode for a second preset time period, the temperatures of the plurality of coils are obtained. Determining a second target temperature according to the temperatures of the plurality of coils; and when the second target temperature does not meet the preset anti-freezing condition, stopping running the anti-freezing protection mode.

In the scheme, the second preset time can be preset in advance according to the habit of the user for using the air conditioner so as to judge the temperature change condition of the plurality of coil pipes after the air conditioner operates for a period of time in the anti-freezing and cleaning protection mode, and the second target temperature is determined according to the changed temperatures of the plurality of coil pipes. And determining whether the air conditioner needs to continue to perform anti-freezing protection or not according to the specific value of the second target temperature, and stopping running the anti-freezing protection mode when the current air conditioner does not need to perform anti-freezing protection. The resource waste caused by the fact that the air conditioner is still protected from being frozen and cleaned when the temperature of the coil pipe is too high is avoided.

Further, when the second target temperature meets a preset anti-freezing condition, the air conditioner is controlled to execute an anti-freezing protection mode associated with the second target temperature.

In the scheme, after the second target temperature is determined to meet the preset anti-freezing condition, the anti-freezing protection mode associated with the second target temperature is determined through the specific value of the second target temperature, and the air conditioner is controlled to execute the anti-freezing protection mode, so that the anti-freezing protection mode of the air conditioner can be adjusted through the change condition of the temperature of the coil pipe, and the stable operation of the air conditioner is ensured.

In practical application, when the ambient temperature is lower than 30 ℃, after the air-conditioning compressor operates for a first preset time, the temperature of the first coil pipe is obtained to be 4 ℃, the temperature of the second coil pipe is obtained to be 2 ℃, and then the first target temperature is determined to be 2 ℃. And judging whether the first target temperature meets a preset anti-freezing condition, and determining an anti-freezing protection mode associated with 2 ℃ as a mode for controlling the frequency of the air conditioner compressor to be reduced at a speed of 1HZ per second after the first target temperature meets the preset anti-freezing condition. And after the anti-freezing cleaning mode is operated for a second preset time, acquiring the temperature of the first coil pipe again as 14 ℃, the temperature of the second coil pipe as 10 ℃, and further determining that the second target temperature is 10 ℃. And ending the anti-freezing cleaning mode after judging that the second target temperature does not meet the anti-freezing cleaning protection condition.

Fig. 3 is a schematic diagram of an apparatus for anti-freeze protection of an air conditioner evaporator according to an embodiment of the present disclosure, and in conjunction with fig. 3, the embodiment of the present disclosure provides an apparatus for anti-freeze protection of an air conditioner evaporator, which includes an obtaining module 21, a determining module 22, and a control module 23. The obtaining module 21 is configured to obtain temperatures of the plurality of coils; the determination module 22 is configured to determine a first target temperature from the temperatures of the plurality of coils; the control module 23 is configured to control the air conditioner to perform an anti-freeze protection mode associated with the first target temperature when the target temperature satisfies a preset anti-freeze condition.

By adopting the device for protecting the evaporator of the air conditioner from freezing and cleaning, provided by the embodiment of the disclosure, the coils can be respectively arranged on a plurality of flow paths of the evaporator, and after the temperatures of the plurality of coils are obtained, a first target temperature is selected to represent the current integral icing condition of the evaporator. And when the first target temperature meets the anti-freezing condition, the air conditioner can be controlled to execute an anti-freezing protection mode corresponding to the first target temperature, so that the anti-freezing protection of the evaporator of the air conditioner can be still performed when the temperature of the single flow path of the air conditioner is overhigh.

Fig. 4 is a schematic view of another device for anti-freeze protection of an air conditioner evaporator according to an embodiment of the present disclosure, and in conjunction with fig. 4, an embodiment of the present disclosure provides a device for anti-freeze protection of an air conditioner evaporator, which includes a processor (processor)100 and a memory (memory) 101. Optionally, the apparatus may also include a Communication Interface (Communication Interface)102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may invoke logic instructions in the memory 101 to perform the method for air conditioner evaporator freeze protection of the above-described embodiments.

In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.

The memory 101, which is a computer-readable storage medium, may be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by executing program instructions/modules stored in the memory 101, that is, implements the method for anti-freeze protection of an air conditioner evaporator in the above-described embodiment.

The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides an air conditioner, which comprises the device for protecting the evaporator of the air conditioner from freezing and cleaning.

Embodiments of the present disclosure provide a computer-readable storage medium having stored thereon computer-executable instructions configured to perform the above-described method for anti-freeze protection of an air conditioner evaporator.

Embodiments of the present disclosure provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described method for anti-freeze protection of an air conditioner evaporator.

The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.

The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.

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

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

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

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

Claims

1. A method for frost protection of an air conditioning evaporator, said evaporator being provided with a plurality of coils, said method comprising:

obtaining temperatures of the plurality of coils;

determining a first target temperature from the temperatures of the plurality of coils;

and when the first target temperature meets a preset anti-freezing condition, controlling the air conditioner to execute an anti-freezing protection mode associated with the first target temperature.

2. The method of claim 1, wherein determining a first target temperature from the temperatures of the plurality of coils comprises:

among the temperatures of the plurality of coils, the coil temperature that is the lowest is determined as a first target temperature.

3. The method of claim 1, wherein the plurality of coils are disposed on different flow paths, the plurality of coils comprising:

the first coil is arranged at the lower part of the evaporator;

and the second coil is arranged in the middle of the evaporator.

4. The method of claim 1, further comprising:

and when the compressor of the air conditioner runs for a first preset time, obtaining the temperatures of the plurality of coils.

5. The method of claim 3, further comprising:

and acquiring the working ambient temperature of the evaporator, and acquiring the temperatures of the plurality of coils when the ambient temperature is lower than a preset temperature.

6. The method of claim 5, further comprising:

and when the ambient temperature is not lower than the preset temperature, acquiring the temperature of the second coil pipe, and performing anti-freezing protection according to the temperature of the second coil pipe.

7. The method according to any one of claims 1 to 6, further comprising, after the air conditioner performs the anti-freeze protection mode:

when the air conditioner is operated in the anti-freezing protection mode for a second preset time, obtaining the temperatures of the plurality of coil pipes;

determining a second target temperature based on the temperatures of the plurality of coils;

and when the second target temperature does not meet the preset anti-freezing condition, stopping running the anti-freezing protection mode.

8. An apparatus for freeze protection of an air conditioning evaporator, comprising:

an obtaining module configured to obtain temperatures of a plurality of coils;

a determination module configured to determine a first target temperature from the temperatures of the plurality of coils;

a control module configured to control the air conditioner to execute an anti-freeze protection mode associated with the first target temperature when the target temperature satisfies a preset anti-freeze condition.

9. An apparatus for anti-freeze protection of an air conditioner evaporator, comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for anti-freeze protection of an air conditioner evaporator according to any one of claims 1 to 7 when executing the program instructions.

10. An air conditioner characterized in that it comprises a device for frost protection of the evaporator of an air conditioner according to claim 9.