Direct-blowing prevention control method and device of air conditioner

Abstract

The application discloses an anti-direct-blow control method and device of an air conditioner. The method comprises the following steps: in the anti-direct-blow mode, the pipe-in temperature of each branch of the evaporator of the air conditioner in a first predetermined time period is acquired, wherein each branch is a pipe line through which the refrigerant flows in the evaporator; when it is determined that the pipe-in temperature of each branch reaches the starting temperature of the refrigerant flow path adjustment mode, the opening degree of the control valve of the air conditioner is adjusted to adjust the amount of refrigerant entering the evaporator, so that the refrigerant heat exchange difference in each region of the evaporator is reduced to a predetermined temperature difference threshold. The application solves the technical problem that, in the related art, when the axial flow fan system with a double air outlet structure and the fixed-frequency compressor air conditioner enter the anti-direct-blow mode, the refrigerant heat exchange in the upper and lower parts of the evaporator has a large difference due to the reason that the rotating speed of the upper fan is increased and the rotating speed of the lower fan is reduced, the superheat degree of the refrigerant in the upper part is increased, the superheat degree of the refrigerant in the lower part is reduced, and frost appears in the lower part of the evaporator.

Description

Technical Field

[0001] This invention relates to the field of home appliance control technology, and more specifically, to a method and device for preventing direct airflow from an air conditioner. Background Technology

[0002] Currently, air conditioners generally adopt a dual-outlet structure, with guide grilles installed at both outlets. Due to the high air velocity of axial fans, especially with dual outlets, the airflow angle is wide, making it impossible for users to avoid the airflow by standing or sitting, which can cause discomfort. Even after shutting down one of the fans or reducing the fan speed to prevent the airflow from blowing on people, the evaporator cannot achieve good heat exchange, causing the temperature inside the evaporator tubes to continuously decrease over time, which can easily trigger the anti-freeze protection.

[0003] Regarding the aforementioned technologies, when axial fan systems with dual air outlets and fixed-frequency compressor air conditioners enter anti-direct-blow mode, the increased speed of the upper fan and decreased speed of the lower fan lead to a significant difference in refrigerant heat exchange between the upper and lower parts of the evaporator. This results in increased superheat in the upper part and decreased superheat in the lower part, causing frost to form on the lower part of the evaporator. Currently, no effective solution has been proposed. Summary of the Invention

[0004] This invention provides a method and apparatus for controlling direct airflow in an air conditioner, which at least solves the technical problem in related technologies where, when an axial fan system with a dual-outlet structure and a fixed-frequency compressor air conditioner enters the anti-direct airflow mode, the increased speed of the upper fan and decreased speed of the lower fan lead to a significant difference in refrigerant heat exchange between the upper and lower parts of the evaporator. This results in increased superheat of the refrigerant in the upper part and decreased superheat in the lower part, causing frost to form on the lower part of the evaporator.

[0005] According to one aspect of the present invention, an anti-direct-blow control method for an air conditioner is provided, comprising: upon receiving an anti-direct-blow command, controlling the air conditioner to enter an anti-direct-blow mode, wherein the anti-direct-blow command is used to instruct the air conditioner to enter the anti-direct-blow mode, wherein in the anti-direct-blow mode, the rotation speed of the upper fan of the air conditioner increases by a first preset value, and the rotation speed of the lower fan of the air conditioner decreases by a second preset value; in the anti-direct-blow mode, acquiring the pipe temperature of each branch of the evaporator of the air conditioner within a first predetermined time period, wherein each branch is a pipe through which refrigerant flows within the evaporator; when it is determined that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, adjusting the opening of a control valve of the air conditioner to adjust the amount of refrigerant entering the evaporator, thereby reducing the difference in refrigerant heat exchange in each region of the evaporator to a predetermined temperature difference threshold, wherein the control valve is used to control the amount of refrigerant entering the evaporator.

[0006] Optionally, upon receiving an anti-direct-blow command, controlling the air conditioner to enter the anti-direct-blow mode includes: controlling the first airflow guide grille corresponding to the upper fan and the second airflow guide grille corresponding to the lower fan to rotate to a set position in the anti-direct-blow mode; acquiring the first current speed of the upper fan and the second current speed of the lower fan; determining the first target speed of the upper fan and the second target speed of the lower fan in the anti-direct-blow mode; determining the first preset value based on the first target speed and the first current speed, and determining the second preset value based on the second target speed and the second target speed; controlling the upper fan to increase the first preset value based on the first current speed, and controlling the lower fan to decrease the second preset value based on the second current speed.

[0007] Optionally, determining that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode includes: acquiring the intermediate pipe temperature of the first heat exchange branch and the intermediate pipe temperature of the second heat exchange branch near the down fan within the first predetermined time period; determining that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode when the intermediate pipe temperature of the first heat exchange branch is not greater than a first preset temperature within the first predetermined time period, or when the intermediate pipe temperature of the second heat exchange branch is not greater than the first preset temperature within the first predetermined time period.

[0008] Optionally, when it is determined that the pipe temperature of each of the branches reaches the start-up temperature of the refrigerant flow path adjustment mode, the opening of the control valve of the air conditioner is adjusted, including: controlling the three-way valve of the air conditioner to be energized and reversed, so that the refrigerant flows from the refrigerant bypass pipe of the evaporator into at least two refrigerant inlet branches of each of the branches, wherein the three-way valve is located on the refrigerant outlet side of the evaporator and is used to control the flow direction of the refrigerant in a portion of the refrigerant outlet branches of each of the branches, the flow direction including one of the following: the refrigerant bypass pipe, the pipe where the main refrigerant outlet is located, the bypass pipe being used to transport the refrigerant in the portion of the refrigerant outlet branches to the at least two refrigerant inlet branches.

[0009] Optionally, when it is determined that the pipe temperature of each of the branches reaches the start-up temperature of the refrigerant flow path adjustment mode, the opening of the control valve of the air conditioner is adjusted, including: obtaining the outlet air temperature at the second guide grille corresponding to the down fan; determining the second preset temperature at the second guide grille corresponding to the down fan; determining the first temperature difference between the outlet air temperature at the second guide grille and the second preset temperature, and simultaneously determining the second temperature difference between the pipe temperatures of each of the branches; determining the target opening of the control valve based on the first temperature difference and the second temperature difference; controlling the opening of the control valve to adjust to the target opening to adjust the amount of refrigerant entering the evaporator, thereby reducing the difference in refrigerant heat exchange in each area of ​​the evaporator.

[0010] Optionally, the method for preventing direct airflow in the air conditioner further includes: controlling the control valve to close when the first temperature difference indicates that the temperature difference between the outlet air temperature at the second air guide grille and the second preset temperature is not less than a third preset temperature within a second predetermined time period.

[0011] Optionally, the anti-direct-blow control method of the air conditioner further includes: after the three-way valve is continuously energized for a set time, if the temperature inside the intermediate pipe of the first heat exchange branch and the intermediate pipe of the second heat exchange branch near the down fan are both not less than the set temperature, or the temperature difference between the outlet air temperature at the second guide grille corresponding to the down fan and the second preset temperature at the second guide grille is not greater than the temperature threshold, the air conditioner is controlled to exit the refrigerant flow path adjustment mode, wherein, when exiting the refrigerant flow path adjustment mode, the control valve is opened to the maximum opening degree and the three-way valve is de-energized.

[0012] Optionally, the method for preventing direct airflow in the air conditioner further includes: when it is determined that the pipe temperature of any three branches in each of the branches is not greater than a fourth preset temperature within the first preset time period, controlling the air conditioner to enter an anti-freeze protection mode, wherein, in the anti-freeze protection mode, the compressor and outdoor fan of the air conditioner stop running, and the indoor fan and the sweeping fan of the air conditioner remain in their current state.

[0013] Optionally, the method for preventing direct airflow in the air conditioner further includes: calculating the total duration of the air conditioner in the anti-freeze protection mode; obtaining the pipe temperature of each branch in the anti-freeze protection mode during a third predetermined time period; and controlling the air conditioner to exit the anti-freeze protection mode when it is determined that the total duration of the air conditioner in the anti-freeze protection mode reaches the predetermined duration and the pipe temperature during the third predetermined time period is not less than a fifth preset temperature.

[0014] According to another aspect of the present invention, an anti-direct-blow control device for an air conditioner is also provided, comprising: a control unit, configured to control the air conditioner to enter an anti-direct-blow mode upon receiving an anti-direct-blow command, wherein the anti-direct-blow command is used to instruct the air conditioner to enter the anti-direct-blow mode, wherein in the anti-direct-blow mode, the rotational speed of the upper fan of the air conditioner increases by a first preset value, and the rotational speed of the lower fan of the air conditioner decreases by a second preset value; an acquisition unit, configured to acquire the pipe temperature of each branch of the evaporator of the air conditioner within a first predetermined time period in the anti-direct-blow mode, wherein each branch is a pipe through which refrigerant flows within the evaporator; and an adjustment unit, configured to adjust the opening of a control valve of the air conditioner when it is determined that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, thereby adjusting the amount of refrigerant entering the evaporator, so that the difference in refrigerant heat exchange in each region of the evaporator is reduced to a predetermined temperature difference threshold, wherein the control valve is used to control the amount of refrigerant entering the evaporator.

[0015] Optionally, the control unit includes: a first control module, configured to control the first guide grille corresponding to the upper fan and the second guide grille corresponding to the lower fan to rotate to a set position in the anti-direct-blow mode; a first acquisition module, configured to acquire the first current speed of the upper fan and the second current speed of the lower fan; a first determination module, configured to determine the first target speed of the upper fan in the anti-direct-blow mode and the second target speed of the lower fan in the anti-direct-blow mode; a second determination module, configured to determine the first preset value based on the first target speed and the first current speed, and to determine the second preset value based on the second target speed and the second target speed; and a second control module, configured to control the upper fan to increase the first preset value based on the first current speed, and to control the lower fan to decrease the second preset value based on the second current speed.

[0016] Optionally, the control unit includes: a second acquisition module, configured to acquire the intermediate pipe temperature of the first heat exchange branch closest to the down fan and the intermediate pipe temperature of the second heat exchange branch within the first predetermined time period; and a third determination module, configured to determine that the pipe temperature of each branch has reached the start-up temperature of the refrigerant flow path adjustment mode when the intermediate pipe temperature of the first heat exchange branch is not greater than a first preset temperature within the first predetermined time period, or when the intermediate pipe temperature of the second heat exchange branch is not greater than the first preset temperature within the first predetermined time period.

[0017] Optionally, the regulating unit includes: a third control module, used to control the energization and reversal of the three-way valve of the air conditioner, so that the refrigerant flows from the refrigerant bypass pipe of the evaporator into at least two refrigerant inlet branches in each of the branches, wherein the three-way valve is located on the refrigerant outlet side of the evaporator and is used to control the flow direction of the refrigerant in a portion of the refrigerant outlet branches in each of the branches, the flow direction including one of the following: the refrigerant bypass pipe, the pipe where the main refrigerant outlet is located, the bypass pipe being used to transport the refrigerant in the portion of the refrigerant outlet branches to the at least two refrigerant inlet branches.

[0018] Optionally, the adjustment unit includes: a third acquisition module for acquiring the outlet air temperature at the second guide grille corresponding to the downflow fan; a fourth determination module for determining a second preset temperature at the second guide grille corresponding to the downflow fan; a fifth determination module for determining a first temperature difference between the outlet air temperature at the second guide grille and the second preset temperature, and simultaneously determining a second temperature difference between the pipe temperatures of each branch; a sixth determination module for determining a target opening degree of the control valve based on the first temperature difference and the second temperature difference; and a fourth control module for controlling the opening degree of the control valve to adjust to the target opening degree, thereby adjusting the amount of refrigerant entering the evaporator and reducing the difference in refrigerant heat exchange in different areas of the evaporator.

[0019] Optionally, the anti-direct-blow control device of the air conditioner further includes: a fifth control module, used to control the control valve to close when the temperature difference between the outlet air temperature at the second air guide grille and the second preset temperature is not less than the third preset temperature within the second predetermined time period, as indicated by the first temperature difference value.

[0020] Optionally, the anti-direct-blow control device of the air conditioner further includes: a sixth control module, used to control the air conditioner to exit the refrigerant flow path adjustment mode after the three-way valve has been continuously energized for a set time, if the temperature inside the middle pipe of the first heat exchange branch and the middle pipe of the second heat exchange branch near the down fan are both not less than the set temperature, or the temperature difference between the outlet air temperature at the second guide grille corresponding to the down fan and the second preset temperature at the second guide grille is not greater than the temperature threshold. In the exiting the refrigerant flow path adjustment mode, the control valve is opened to the maximum opening degree and the three-way valve is de-energized.

[0021] Optionally, the anti-direct-blow control device of the air conditioner further includes: a seventh control module, used to control the air conditioner to enter the anti-freeze protection mode when it is determined that the pipe temperature of any three branches in each of the branches is not greater than the fourth preset temperature within the first preset time period. In the anti-freeze protection mode, the compressor and outdoor fan of the air conditioner stop running, and the indoor fan and the sweeping fan of the air conditioner remain in their current state.

[0022] Optionally, the anti-direct-blow control device of the air conditioner further includes: a statistics module, used to count the total duration of the air conditioner entering the anti-freeze protection mode; a fourth acquisition module, used to acquire the pipe temperature of each branch in the third predetermined time period during the anti-freeze protection mode; and an eighth control module, used to control the air conditioner to exit the anti-freeze protection mode when it is determined that the total duration of the air conditioner operating in the anti-freeze protection mode reaches the predetermined duration and the pipe temperature in the third predetermined time period is not less than a fifth preset temperature.

[0023] According to another aspect of the present invention, an air conditioner is also provided, which uses the anti-direct-blow control method of any one of the above-described air conditioners.

[0024] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes the anti-direct-blow control method for an air conditioner described in any one of the above embodiments.

[0025] According to another aspect of the present invention, a processor is also provided, the processor being configured to run a program, wherein the program, when running, executes the anti-direct-blow control method for an air conditioner as described in any one of the above embodiments.

[0026] In this embodiment of the invention, upon receiving an anti-direct-blow command, the air conditioner is controlled to enter the anti-direct-blow mode. The anti-direct-blow command instructs the air conditioner to enter this mode. In the anti-direct-blow mode, the speed of the air conditioner's upper fan increases by a first preset value, and the speed of the air conditioner's lower fan decreases by a second preset value. In the anti-direct-blow mode, the pipe temperatures of each branch of the air conditioner's evaporator are acquired within a first predetermined time period. Each branch is a pipe through which refrigerant flows within the evaporator. When it is determined that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, the opening of the air conditioner's control valve is adjusted to regulate the amount of refrigerant entering the evaporator, thereby reducing the refrigerant heat exchange difference between different areas of the evaporator to a predetermined temperature difference threshold. The control valve is used to control the amount of refrigerant entering the evaporator. The technical solution provided by this invention enables the adjustment of the refrigerant flow path by detecting the pipe temperature of each branch of the evaporator through a temperature sensor, thereby increasing the heat transfer coefficient. This alleviates the uneven heat exchange and attenuation of the evaporator caused by a reduction in regional airflow, allowing the air conditioner to operate normally within a certain low-temperature range without shutting down due to freezing protection in some areas. This achieves the technical effect of improving the operational stability of the air conditioner. Furthermore, it solves the technical problem in related technologies where axial flow fan systems with dual air outlets and fixed-frequency compressor air conditioners enter the anti-direct-blow mode. This is because the speed of the upper fan increases while the speed of the lower fan decreases, resulting in a large difference in refrigerant heat exchange between the upper and lower parts of the evaporator. The superheat of the refrigerant in the upper part increases while the superheat of the refrigerant in the lower part decreases, leading to frost formation on the lower part of the evaporator. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a hardware structure block diagram of a mobile terminal for an air conditioner anti-direct-blow control method according to an embodiment of the present invention;

[0029] Figure 2 This is a flowchart of an air conditioner anti-direct-blow control method according to an embodiment of the present invention;

[0030] Figure 3 This is a side view of an air conditioner according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the evaporator flow path according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the front of an air conditioner according to an embodiment of the present invention;

[0033] Figure 6This is a flowchart of an optional air conditioner anti-direct-blow control method according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of an air conditioner's anti-direct-blow control device according to an embodiment of the present invention. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention 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 so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] As described in the background section, when related technologies employ axial fan systems with dual air outlets and fixed-frequency compressor air conditioners enter anti-direct-blow mode, the increased speed of the upper fan and decreased speed of the lower fan lead to a significant difference in refrigerant heat exchange between the upper and lower parts of the evaporator. The superheat of the refrigerant in the upper part increases, while the superheat in the lower part decreases, resulting in frost formation on the lower part of the evaporator. Furthermore, because the frequency of the fixed-frequency compressor cannot be changed, the compressor is stopped during anti-freeze protection to raise the evaporator's internal pipe temperature, resulting in frequent start-stop cycles and lower air conditioner stability. To address these shortcomings, this invention provides an anti-direct-blow control method and apparatus for air conditioners.

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0039] The methods and embodiments provided in this invention can be executed on a mobile terminal, a computer terminal, or a similar computing device. Taking running on a mobile terminal as an example, Figure 1This is a hardware structure block diagram of a mobile terminal for an air conditioner's anti-direct-blow control method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0040] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the anti-direct-blow control method for an air conditioner in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one instance, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0041] According to an embodiment of the present invention, a method embodiment of an air conditioner anti-direct blowing control method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0042] Figure 2This is a flowchart of an air conditioner anti-direct-blow control method according to an embodiment of the present invention, such as... Figure 2 As shown, the method for preventing direct airflow in this air conditioner includes the following steps:

[0043] Step S202: Upon receiving the anti-direct-blow command, control the air conditioner to enter the anti-direct-blow mode. The anti-direct-blow command is used to instruct the air conditioner to enter the anti-direct-blow mode. In the anti-direct-blow mode, the speed of the air conditioner's upper fan increases by a first preset value, and the speed of the air conditioner's lower fan decreases by a second preset value.

[0044] Figure 3 This is a side view of an air conditioner according to an embodiment of the present invention, as shown below. Figure 3 As shown, the air conditioner includes: an evaporator 301, a motor 303, a motor 305, a fan blade 307 connected to the motor 303, a fan blade 309 connected to the motor 305, a guide grille 311 corresponding to the fan blade 307, and a guide grille 313 corresponding to the fan blade 309. Here, the motor 303 drives the fan blade 307 to rotate and blow air, and the motor 305 drives the fan blade 309 to rotate and blow air. The air is blown out through the guide grille 311 and the guide grille 313.

[0045] In this embodiment, if a user feels the airflow is too strong and wants to avoid being directly blown by the air conditioner while it is running, they can trigger a physical button on the air conditioner or send a command to control one of the air conditioner's fans to turn off or reduce its speed. At this time, the air conditioner enters the anti-direct-blow mode.

[0046] Step S204: In the anti-direct-blow mode, obtain the pipe temperature of each branch of the evaporator of the air conditioner during the first predetermined time period, wherein each branch is the pipe through which the refrigerant flows in the evaporator.

[0047] In this embodiment, the pipe temperature of each branch of the evaporator of the air conditioner can be obtained over a continuous period of time in the anti-direct-blow mode to determine whether it is necessary to enter the refrigerant flow path adjustment mode.

[0048] Figure 4 This is a schematic diagram of the evaporator flow path according to an embodiment of the present invention, as shown below. Figure 4As shown, taking a 7-in-7-outflow path as an example, the evaporator's outlet branches include refrigerant outlet branch 1, refrigerant outlet branch 2, refrigerant outlet branch 3, refrigerant outlet branch 4, refrigerant outlet branch 5, refrigerant outlet branch 6, and refrigerant outlet branch 7; the evaporator's inlet branches include refrigerant inlet branch 1, refrigerant inlet branch 2, refrigerant inlet branch 3, refrigerant inlet branch 4, refrigerant inlet branch 5, refrigerant inlet branch 6, and refrigerant inlet branch 7. A three-way valve and a main refrigerant outlet are also installed on the outlet side; a one-way valve 2 and a control valve, and a main refrigerant inlet are also installed on the inlet side. A one-way valve 1 is installed on the refrigerant bypass path. When the control valve is open and the three-way valve is de-energized, a 7-in-7-outflow path distribution is formed; when the three-way valve is energized, refrigerant outlet branch 4 and refrigerant outlet branch 6 form a bypass path, merging into refrigerant inlet branch 5 and refrigerant inlet branch 7.

[0049] It should be noted that the location of the refrigerant inlet branch corresponds to the refrigerant inlet branch, and some refrigerant inlet branches are not shown in the figure.

[0050] Step S206: When the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, adjust the opening of the control valve of the air conditioner to adjust the amount of refrigerant entering the evaporator, so that the heat exchange difference of refrigerant in each area of ​​the evaporator is reduced to a predetermined temperature difference threshold. The control valve is used to control the amount of refrigerant entering the evaporator.

[0051] In this embodiment, when the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, the opening of the control valve on the inlet side of the air conditioner will be adjusted to regulate the amount of refrigerant entering the evaporator, so that the heat exchange difference of the refrigerant in each area of ​​the evaporator is reduced to the preset temperature difference threshold, thereby ensuring the refrigerant flow rate of each branch of the evaporator and having a certain degree of superheat.

[0052] As described above, in this embodiment of the invention, upon receiving an anti-direct-blow command, the air conditioner is controlled to enter the anti-direct-blow mode. The anti-direct-blow command instructs the air conditioner to enter this mode. In the anti-direct-blow mode, the speed of the air conditioner's upper fan increases by a first preset value, and the speed of the air conditioner's lower fan decreases by a second preset value. In the anti-direct-blow mode, the pipe temperatures of each branch of the air conditioner's evaporator are obtained within a first predetermined time period, where each branch is a pipe through which the refrigerant flows within the evaporator. When it is determined that the pipe temperature of each branch reaches the starting temperature of the refrigerant flow path adjustment mode, the refrigerant flow path is adjusted... The opening degree of the control valve of the air conditioner is adjusted to regulate the amount of refrigerant entering the evaporator, so that the difference in refrigerant heat exchange in different areas of the evaporator is reduced to a predetermined temperature difference threshold. The control valve is used to control the amount of refrigerant entering the evaporator. It realizes the adjustment of the refrigerant flow path by detecting the pipe temperature of each branch of the evaporator through temperature sensors, thereby increasing the heat transfer coefficient, mitigating the uneven heat exchange and attenuation of the evaporator caused by the reduction of regional air volume, and enabling the air conditioner to operate normally within a certain low temperature range without shutting down due to freezing protection in some areas. This achieves the technical effect of improving the operational stability of the air conditioner.

[0053] Therefore, the technical solution provided by the embodiments of the present invention solves the technical problem in the related art where, when an axial flow fan system with a dual air outlet structure and a fixed-frequency compressor air conditioner enters the anti-direct-blow mode, the speed of the upper fan increases while the speed of the lower fan decreases, resulting in a large difference in refrigerant heat exchange between the upper and lower parts of the evaporator. This leads to an increase in the superheat of the refrigerant in the upper part and a decrease in the superheat in the lower part, causing frost to form on the lower part of the evaporator.

[0054] According to the above embodiments of the present invention, when receiving an anti-direct-blow command, controlling the air conditioner to enter the anti-direct-blow mode may include: controlling the first airflow guide grille corresponding to the upper fan and the second airflow guide grille corresponding to the lower fan to rotate to a set position in the anti-direct-blow mode; acquiring the first current speed of the upper fan and the second current speed of the lower fan; determining the first target speed of the upper fan in the anti-direct-blow mode and the second target speed of the lower fan in the anti-direct-blow mode; determining a first preset value based on the first target speed and the first current speed, and determining a second preset value based on the second target speed and the second target speed; controlling the upper fan to increase the first preset value based on the first current speed, and controlling the lower fan to decrease the second preset value based on the second current speed.

[0055] Figure 5 This is a schematic diagram of the front of an air conditioner according to an embodiment of the present invention, as shown below. Figure 5 As shown, the air conditioner has two air outlets, one above and one below, and each outlet is equipped with a guide grille 51 (i.e., Figure 3 The flow guide grille 311) and flow guide grille 52 (i.e., Figure 3(The air guide grille 313 in the middle). That is, the air conditioner provided in the embodiment of the present invention includes two fan systems, upper and lower, which can realize three-dimensional air supply from the top and bottom, and the upper and lower air outlets can be controlled independently.

[0056] In this embodiment, when the air conditioner receives an anti-direct-blow command, it controls the first airflow guide grille corresponding to the upper fan and the second airflow guide grille corresponding to the lower fan to rotate to their respective set positions, that is, to their program setting points. Furthermore, it controls the upper fan to increase its speed by a certain amount from its current setting, and the lower fan to decrease its speed by a certain set value from its current setting.

[0057] According to the above embodiments of the present invention, determining that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode includes: acquiring the intermediate pipe temperature of the first heat exchange branch and the intermediate pipe temperature of the second heat exchange branch near the down fan within a first predetermined time period; when the intermediate pipe temperature of the first heat exchange branch is not greater than a first preset temperature within the first predetermined time period, or when the intermediate pipe temperature of the second heat exchange branch is not greater than the first preset temperature within the first predetermined time period, determining that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode.

[0058] In this embodiment, when it is determined that the pipe temperature of each branch of the air conditioner reaches the start-up temperature of the refrigerant flow path adjustment mode, the pipe temperature of the middle pipe of the first heat exchange branch and the pipe temperature of the middle pipe of the second heat exchange branch, which are closer to the down fan, can be obtained within a certain period of time. When it is determined that the pipe temperature of the middle pipe of the first heat exchange branch is not greater than the preset temperature for a continuous period of time, or the pipe temperature of the middle pipe of the second heat exchange branch is not greater than the preset temperature for a continuous period of time, it is determined that the pipe temperature of each branch has reached the start-up temperature of the refrigerant flow path adjustment mode.

[0059] by Figure 4 Taking the 7-inlet, 7-outlet evaporator as an example, in the anti-direct-blow mode, the intermediate temperature T of the 6th heat exchange branch (i.e., the aforementioned first heat exchange branch) is detected. m6 The intermediate temperature T between the 7th heat exchange branch (i.e., the aforementioned second heat exchange branch) and the 7th heat exchange branch. m7 When T is detected for 30 consecutive seconds m6 ≤3℃ or T m7 When the temperature is ≤3℃, determine that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path regulation mode.

[0060] According to the above embodiments of the present invention, when it is determined that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, adjusting the opening of the control valve of the air conditioner may include: controlling the three-way valve of the air conditioner to be energized and reversed, so that the refrigerant flows from the refrigerant bypass pipe of the evaporator into at least two refrigerant inlet branches in each branch, wherein the three-way valve is provided on the refrigerant outlet side of the evaporator and is used to control the flow direction of the refrigerant in a portion of the refrigerant outlet branches in each branch, the flow direction including one of the following: refrigerant bypass pipe, pipe where the refrigerant main outlet is located, the bypass pipe is used to transport the refrigerant in a portion of the refrigerant outlet branches to at least two refrigerant inlet branches.

[0061] In this embodiment, the intermediate temperature T of the sixth heat exchange branch is detected. m6 The intermediate temperature T of the 7th heat exchange branch m7 When T is detected for 30 consecutive seconds m6 ≤3℃ or T m7 When the temperature is ≤3℃, the three-way valve is energized and reversed. The refrigerant flows from the bypass passage into the refrigerant inlet branch 5 and the refrigerant inlet branch 7, instead of flowing to the main refrigerant outlet. This bypass allows the refrigerant at the outlet to re-enter the heat exchanger, enhancing the flow state inside the tube, increasing the refrigerant mass flow rate in the low dryness zone, and improving the flow boiling heat transfer coefficient.

[0062] In other words, since the heat exchange of the refrigerant in the lower part of the evaporator is relatively small, the change in dryness at the inlet and outlet is not significant. The refrigerant at the outlet is still in a state of low dryness, with a large mass flow rate and a small pressure drop. By bypassing the refrigerant at the outlet to re-enter the heat exchanger, the heat exchange energy can be enhanced, the flow state inside the tube can be strengthened, the refrigerant mass flow rate in the low dryness zone can be increased, and the flow boiling heat transfer coefficient can be improved.

[0063] like Figure 4 In the 7-inlet, 7-outlet evaporator shown, refrigerant inlet branch 5 and refrigerant inlet branch 7 are located in the lower half and upper half of the refrigerant inlet of the evaporator, respectively. The refrigerant flows into refrigerant inlet branch 5 and refrigerant inlet branch 7 through the refrigerant bypass, which can quickly reduce the temperature difference of the refrigerant in the evaporator, prevent large differences in heat exchange of the refrigerant in the upper and lower parts of the evaporator, and improve the operating stability of the air conditioner.

[0064] Figure 6 This is a flowchart of an optional anti-direct-blow control method for an air conditioner according to an embodiment of the present invention, such as... Figure 6 As shown, the pipe temperature Tmi (i = 1, 2…7) of each branch of the evaporator can be detected by a temperature sensor, and then it can be determined whether Tmi is detected continuously for 30 seconds. m6 ≤3℃ or T m7 ≤3℃; if so, it enters variable flow path mode and the three-way valve reverses; otherwise, heat exchange is performed according to a fixed flow rate.

[0065] According to the above embodiments of the present invention, when it is determined that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, the opening degree of the control valve of the air conditioner is adjusted, including: obtaining the outlet air temperature at the second guide grille corresponding to the down fan; determining the second preset temperature at the second guide grille corresponding to the down fan; determining the first temperature difference between the outlet air temperature at the second guide grille and the second preset temperature, and simultaneously determining the second temperature difference between the pipe temperatures of each branch; determining the target opening degree of the control valve based on the first temperature difference and the second temperature difference; controlling the opening degree of the control valve to adjust to the target opening degree to adjust the amount of refrigerant entering the evaporator, so as to reduce the difference in refrigerant heat exchange in each area of ​​the evaporator.

[0066] In this embodiment, it is possible to detect, such as Figure 5 The outlet air temperature T at the guide grille 52 shown 出风2 The set temperature T at this location 设定 According to the outlet air temperature T 出风2 Set temperature T 设定 And the pipe temperature T of each branch mi The opening degree is adjusted by comprehensively judging the difference, so as to ensure the refrigerant flow in each branch of the evaporator and a certain degree of superheat.

[0067] According to the above embodiments of the present invention, the method for preventing direct airflow in the air conditioner may further include: when the first temperature difference indicates that the temperature difference between the outlet air temperature at the second air guide grille and the second preset temperature is not less than the third preset temperature within a second predetermined time period, the control valve is closed.

[0068] In this embodiment, when the temperature difference between the outlet air temperature at the second guide grille and the second preset temperature is determined to be greater than the preset temperature difference, the control valve can be controlled to close.

[0069] For example, if ΔT = (T) is detected continuously for 1 minute 设 -T 出风2 When the temperature is ≥10℃, the control valve is closed.

[0070] According to an embodiment of the present invention, the method for preventing direct airflow in the air conditioner may further include: after the three-way valve is continuously energized for a set time, if the temperature inside the intermediate pipe of the first heat exchange branch near the lower fan and the temperature inside the intermediate pipe of the second heat exchange branch are both not less than the set temperature, or the temperature difference between the outlet air temperature at the second guide grille corresponding to the lower fan and the second preset temperature at the second guide grille is not greater than the temperature threshold, the air conditioner is controlled to exit the refrigerant flow path adjustment mode, wherein, when exiting the refrigerant flow path adjustment mode, the control valve is opened to the maximum opening degree and the three-way valve is de-energized.

[0071] like Figure 6 As shown, after the three-way valve is continuously energized for 10 minutes, if T... m6 ≥7℃ and Tm7 If the temperature is ≥7℃, the air conditioner will exit the refrigerant flow path adjustment mode; alternatively, it can be set to (T 设 -2℃)≤T 出风2 When the air conditioner exits the refrigerant flow path adjustment mode, the control valve opens to its maximum opening, the three-way valve is de-energized, and the variable flow path control is disengaged.

[0072] According to the above embodiments of the present invention, the anti-direct-blow control method of the air conditioner may further include: when it is determined that the pipe temperature of any three branches in each branch does not exceed a fourth preset temperature within a first preset time period, controlling the air conditioner to enter an anti-freeze protection mode, wherein, in the anti-freeze protection mode, the compressor and outdoor fan of the air conditioner stop running, and the indoor fan and the sweeping fan of the air conditioner remain in their current state.

[0073] In this embodiment, during cooling or dehumidification mode, the compressor starts 10 minutes after activation, such as... Figure 6 As shown, when T is detected continuously for 1 minute 蒸 When the temperature is ≤0℃, the air conditioner will enter the anti-freeze protection mode. In anti-freeze protection mode, the air conditioner's compressor and outdoor fan will stop running, while the indoor fan and sweeping fan will remain in their current state.

[0074] According to the above embodiments of the present invention, the method for preventing direct airflow in an air conditioner further includes: calculating the total duration of the air conditioner entering the anti-freeze protection mode; obtaining the pipe temperature of each branch within a third predetermined time period during the anti-freeze protection mode; and controlling the air conditioner to exit the anti-freeze protection mode when it is determined that the total duration of the air conditioner operating in the anti-freeze protection mode reaches the predetermined duration and the pipe temperature within the third predetermined time period is not less than a fifth preset temperature.

[0075] In this embodiment, if the compressor has been stopped for a period of time and the temperature inside the pipes of each branch of the evaporator is not lower than the predetermined temperature, the compressor is controlled to exit the anti-freeze protection mode.

[0076] like Figure 6 As shown, when Tmi≥10℃ is detected and the compressor has been running for 6 minutes, the compressor is controlled to exit the anti-freeze protection mode, and each branch of the evaporator exchanges heat according to the fixed flow path.

[0077] As can be seen from the above, the technical solution provided by the above embodiments of the present invention solves the problem of preventing air conditioner freezing in the anti-direct-blow mode of a dual-axial flow fan system air conditioner when the regional air volume decreases. This solves the problem of anti-freeze protection caused by reduced wind speed, allowing the air conditioner to operate normally within a certain low-temperature range without stopping due to freezing protection, thus alleviating temperature fluctuation problems. There are two scenarios: ① When the evaporator pipe temperature does not reach the anti-freeze protection temperature threshold, the control valve opens and the three-way valve is de-energized, forming a 7-inlet, 7-outlet flow path distribution; ② When the evaporator pipe temperature reaches the anti-freeze protection temperature threshold, the control valve adjusts its opening according to the pipe temperature of each branch, forming a variable flow path, reducing or preventing refrigerant from the total refrigerant inlet from entering the evaporator inlet 5 and inlet 7. This control method for alleviating frost formation on the evaporator surface and reducing anti-freeze protection under the anti-direct-blow function detects the pipe temperature of each branch of the evaporator using a temperature sensor. Based on the temperature difference between the indoor ambient temperature and the set temperature, and the pipe temperature of each branch of the evaporator, the flow path of the evaporator and the refrigerant flow rate of each branch are changed.

[0078] Therefore, the air conditioner anti-direct-blow control method provided in this embodiment of the invention can adjust the refrigerant flow path by detecting the pipe temperature of each branch of the evaporator through a temperature sensor, thereby increasing the heat transfer coefficient and alleviating the uneven heat exchange and attenuation caused by regional airflow reduction. This allows the air conditioner to operate normally within a certain low-temperature range and will not shut down due to freezing protection in some areas. Furthermore, by adding a bypass, the refrigerant that has experienced uneven heat exchange can be re-integrated with the refrigerant at the distributor pipe and returned to the evaporator for heat exchange. By merging and splitting the flow paths, the number of flow paths in the evaporator is changed. By varying the flow paths of the evaporator and the refrigerant flow rate in the branch paths, the problem of freezing protection caused by reduced airflow speed is solved, allowing the air conditioner to operate normally within a certain low-temperature range without shutting down due to freezing protection, thus mitigating temperature fluctuation problems.

[0079] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0080] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0081] According to embodiments of the present invention, an anti-direct-blow control device for an air conditioner for implementing the above-described anti-direct-blow control method for an air conditioner is also provided. Figure 7 This is a schematic diagram of an air conditioner's anti-direct-blow control device according to an embodiment of the present invention, as shown below. Figure 7 As shown, the anti-direct-blow control device of the air conditioner may include: a control unit 71, an acquisition unit 73, and an adjustment unit 75. The anti-direct-blow control device of the air conditioner will be described below.

[0082] The control unit 71 is used to control the air conditioner to enter the anti-direct-blow mode when it receives the anti-direct-blow command. The anti-direct-blow command is used to instruct the air conditioner to enter the anti-direct-blow mode. In the anti-direct-blow mode, the speed of the air conditioner's upper fan increases by a first preset value, and the speed of the air conditioner's lower fan decreases by a second preset value.

[0083] The acquisition unit 73 is used to acquire the pipe temperature of each branch of the evaporator of the air conditioner during a first predetermined time period in the anti-direct-blow mode, wherein each branch is a pipe through which the refrigerant flows in the evaporator.

[0084] The regulating unit 75 is used to adjust the opening of the control valve of the air conditioner when the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path regulating mode, so as to regulate the amount of refrigerant entering the evaporator, so that the difference in refrigerant heat exchange in each area of ​​the evaporator is reduced to a predetermined temperature difference threshold. The control valve is used to control the amount of refrigerant entering the evaporator.

[0085] It should be noted that the control unit 71, the acquisition unit 73, and the adjustment unit 75 mentioned above correspond to steps S202 to S206 in the above embodiments. The three units and the corresponding steps implement the same instances and application scenarios, but are not limited to the content disclosed in the above embodiments.

[0086] As can be seen from the above, in the solution described in the above embodiments of the present invention, the control unit can control the air conditioner to enter the anti-direct-blow mode when it receives the anti-direct-blow command. The anti-direct-blow command is used to instruct the air conditioner to enter the anti-direct-blow mode. In the anti-direct-blow mode, the speed of the air conditioner's upper fan increases by a first preset value, and the speed of the air conditioner's lower fan decreases by a second preset value. Then, the acquisition unit acquires the pipe temperature inside each branch of the air conditioner's evaporator within a first predetermined time period in the anti-direct-blow mode, where each branch is the pipe through which the refrigerant flows within the evaporator. Finally, the adjustment unit determines that the pipe temperature inside each branch reaches the refrigerant flow... When the starting temperature of the circuit adjustment mode is reached, the opening of the control valve of the air conditioner is adjusted to regulate the amount of refrigerant entering the evaporator. This reduces the difference in refrigerant heat exchange between different areas of the evaporator to a predetermined temperature difference threshold. The control valve controls the amount of refrigerant entering the evaporator. By detecting the pipe temperature of each branch of the evaporator through a temperature sensor, the flow path of the refrigerant is adjusted, increasing the heat transfer coefficient. This alleviates the uneven heat exchange and attenuation caused by regional reduction in air volume, allowing the air conditioner to operate normally within a certain low-temperature range and preventing shutdown due to freezing protection in some areas. This achieves the technical effect of improving the operational stability of the air conditioner.

[0087] Therefore, the technical solution provided by the embodiments of the present invention solves the technical problem in the related art where, when an axial flow fan system with a dual air outlet structure and a fixed-frequency compressor air conditioner enters the anti-direct-blow mode, the speed of the upper fan increases while the speed of the lower fan decreases, resulting in a large difference in refrigerant heat exchange between the upper and lower parts of the evaporator. This leads to an increase in the superheat of the refrigerant in the upper part and a decrease in the superheat in the lower part, causing frost to form on the lower part of the evaporator.

[0088] Optionally, the control unit includes: a first control module for controlling the first guide grille corresponding to the upper fan and the second guide grille corresponding to the lower fan to rotate to a set position in the anti-direct-blow mode; a first acquisition module for acquiring the first current speed of the upper fan and the second current speed of the lower fan; a first determination module for determining the first target speed of the upper fan in the anti-direct-blow mode and the second target speed of the lower fan in the anti-direct-blow mode; a second determination module for determining a first preset value based on the first target speed and the first current speed, and determining a second preset value based on the second target speed and the second target speed; and a second control module for controlling the upper fan to increase the first preset value based on the first current speed and controlling the lower fan to decrease the second preset value based on the second current speed.

[0089] Optionally, the control unit includes: a second acquisition module, used to acquire the temperature inside the intermediate pipe of the first heat exchange branch closest to the down fan and the temperature inside the intermediate pipe of the second heat exchange branch within a first predetermined time period; and a third determination module, used to determine that the pipe temperature of each branch has reached the start-up temperature of the refrigerant flow path adjustment mode when the temperature inside the intermediate pipe of the first heat exchange branch is not greater than a first preset temperature within the first predetermined time period, or when the temperature inside the intermediate pipe of the second heat exchange branch is not greater than the first preset temperature within the first predetermined time period.

[0090] Optionally, the regulating unit includes: a third control module, used to control the energization and reversal of the three-way valve of the air conditioner, so that the refrigerant flows from the refrigerant bypass pipe of the evaporator into at least two refrigerant inlet branches in each branch, wherein the three-way valve is located on the refrigerant outlet side of the evaporator and is used to control the flow direction of the refrigerant in a portion of the refrigerant outlet branches in each branch, the flow direction including one of the following: refrigerant bypass pipe, pipe where the main refrigerant outlet is located, the bypass pipe is used to transport the refrigerant in a portion of the refrigerant outlet branches to at least two refrigerant inlet branches.

[0091] Optionally, the adjustment unit includes: a third acquisition module for acquiring the outlet air temperature at the second guide grille corresponding to the down fan; a fourth determination module for determining a second preset temperature at the second guide grille corresponding to the down fan; a fifth determination module for determining a first temperature difference between the outlet air temperature at the second guide grille and the second preset temperature, and simultaneously determining a second temperature difference between the pipe temperatures of each branch; a sixth determination module for determining a target opening degree of the control valve based on the first temperature difference and the second temperature difference; and a fourth control module for controlling the opening degree of the control valve to adjust to the target opening degree, thereby adjusting the amount of refrigerant entering the evaporator and reducing the difference in refrigerant heat exchange in different areas of the evaporator.

[0092] Optionally, the anti-direct-blow control device of the air conditioner further includes: a fifth control module, used to control the control valve to close when the temperature difference between the outlet air temperature at the second air guide grille and the second preset temperature is not less than the third preset temperature during the second predetermined time period, according to the first temperature difference value.

[0093] Optionally, the anti-direct-blow control device of the air conditioner further includes: a sixth control module, used to control the air conditioner to exit the refrigerant flow path adjustment mode after the three-way valve has been continuously energized for a set time. If the temperature inside the middle pipe of the first heat exchange branch and the middle pipe of the second heat exchange branch near the lower fan are both not less than the set temperature, or the temperature difference between the outlet air temperature at the second guide grille corresponding to the lower fan and the second preset temperature at the second guide grille is not greater than the temperature threshold, the control valve is opened to the maximum opening degree and the three-way valve is de-energized.

[0094] Optionally, the anti-direct-blow control device of the air conditioner further includes: a seventh control module, used to control the air conditioner to enter the anti-freeze protection mode when it is determined that the pipe temperature of any three branches in each branch does not exceed the fourth preset temperature within a first preset time period. In the anti-freeze protection mode, the compressor and outdoor fan of the air conditioner stop running, while the indoor fan and the sweeping fan of the air conditioner remain in their current state.

[0095] Optionally, the anti-direct-blow control device of the air conditioner further includes: a statistics module for calculating the total duration of the air conditioner in anti-freeze protection mode; a fourth acquisition module for acquiring the pipe temperature of each branch during a third predetermined time period in anti-freeze protection mode; and an eighth control module for controlling the air conditioner to exit anti-freeze protection mode when the total duration of the air conditioner in anti-freeze protection mode reaches the predetermined duration and the pipe temperature during the third predetermined time period is not lower than the fifth preset temperature.

[0096] According to another aspect of the present invention, an air conditioner is also provided, which uses the anti-direct-blow control method of any of the above-described air conditioners.

[0097] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes the air conditioner anti-direct-blow control method of any of the above.

[0098] Optionally, in this embodiment, the computer-readable storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any communication device in a group of communication devices.

[0099] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: upon receiving an anti-direct-blow command, controlling the air conditioner to enter an anti-direct-blow mode, wherein the anti-direct-blow command is used to instruct the air conditioner to enter the anti-direct-blow mode, in which the speed of the air conditioner's upper fan increases by a first preset value, and the speed of the air conditioner's lower fan decreases by a second preset value; in the anti-direct-blow mode, acquiring the pipe temperature of each branch of the air conditioner's evaporator within a first predetermined time period, wherein each branch is a pipe through which refrigerant flows within the evaporator; when it is determined that the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, adjusting the opening of the air conditioner's control valve to adjust the amount of refrigerant entering the evaporator, so that the difference in refrigerant heat exchange in each area of ​​the evaporator is reduced to a predetermined temperature difference threshold, wherein the control valve is used to control the amount of refrigerant entering the evaporator.

[0100] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: controlling the first guide grille corresponding to the upper fan and the second guide grille corresponding to the lower fan to rotate to a set position in the anti-direct-blow mode; acquiring the first current speed of the upper fan and the second current speed of the lower fan; determining the first target speed of the upper fan in the anti-direct-blow mode and the second target speed of the lower fan in the anti-direct-blow mode; determining a first preset value based on the first target speed and the first current speed, and determining a second preset value based on the second target speed and the second target speed; controlling the upper fan to increase the first preset value based on the first current speed, and controlling the lower fan to decrease the second preset value based on the second current speed.

[0101] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the temperature inside the intermediate pipe of the first heat exchange branch closest to the down fan and the temperature inside the intermediate pipe of the second heat exchange branch within a first predetermined time period; when the temperature inside the intermediate pipe of the first heat exchange branch is not greater than a first preset temperature within the first predetermined time period, or when the temperature inside the intermediate pipe of the second heat exchange branch is not greater than the first preset temperature within the first predetermined time period, determining that the pipe temperature of each branch has reached the start-up temperature of the refrigerant flow path adjustment mode.

[0102] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: controlling the three-way valve of the air conditioner to be energized and reversed, so that refrigerant flows from the refrigerant bypass pipe of the evaporator into at least two refrigerant inlet branches in each branch, wherein the three-way valve is located on the refrigerant outlet side of the evaporator and is used to control the flow direction of refrigerant in a portion of the refrigerant outlet branches in each branch, the flow direction including one of the following: refrigerant bypass pipe, pipe where the main refrigerant outlet is located, the bypass pipe is used to transport the refrigerant in a portion of the refrigerant outlet branches to at least two refrigerant inlet branches.

[0103] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the outlet air temperature at the second guide grille corresponding to the down fan; determining a second preset temperature at the second guide grille corresponding to the down fan; determining a first temperature difference between the outlet air temperature at the second guide grille and the second preset temperature, and simultaneously determining a second temperature difference between the pipe temperatures of each branch; determining a target opening degree of the control valve based on the first temperature difference and the second temperature difference; controlling the opening degree of the control valve to adjust to the target opening degree to adjust the amount of refrigerant entering the evaporator, thereby reducing the difference in refrigerant heat exchange in different areas of the evaporator.

[0104] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the first temperature difference indicates that the temperature difference between the outlet air temperature at the second guide grille and the second preset temperature is not less than the third preset temperature within a second predetermined time period, the control valve is controlled to close.

[0105] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: after the three-way valve is continuously energized for a set time, if the temperature inside the intermediate pipe of the first heat exchange branch near the lower fan and the temperature inside the intermediate pipe of the second heat exchange branch are both not less than the set temperature, or the temperature difference between the outlet air temperature at the second guide grille corresponding to the lower fan and the second preset temperature at the second guide grille is not greater than the temperature threshold, the air conditioner is controlled to exit the refrigerant flow path adjustment mode, wherein, when exiting the refrigerant flow path adjustment mode, the control valve is opened to the maximum opening degree and the three-way valve is de-energized.

[0106] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when it is determined that the pipe temperature of any three branches in each branch does not exceed a fourth preset temperature within a first preset time period, the air conditioner is controlled to enter an anti-freeze protection mode, wherein, in the anti-freeze protection mode, the air conditioner's compressor and outdoor fan stop running, and the air conditioner's indoor fan and sweeping fan remain in their current state.

[0107] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: counting the total duration of the air conditioner entering the anti-freeze protection mode; obtaining the pipe temperature of each branch during a third predetermined time period in the anti-freeze protection mode; and controlling the air conditioner to exit the anti-freeze protection mode when it is determined that the total duration of the air conditioner operating in the anti-freeze protection mode has reached the predetermined duration and the pipe temperature during the third predetermined time period is not less than a fifth preset temperature.

[0108] According to another aspect of the present invention, a processor is also provided, which is used to run a program, wherein the program executes the air conditioner anti-direct-blow control method described above.

[0109] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0110] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0111] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0112] 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 units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0113] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0114] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several 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 methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0115] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for controlling direct airflow prevention in an air conditioner, characterized in that, include: Upon receiving an anti-direct-blow command, the air conditioner is controlled to enter the anti-direct-blow mode. The anti-direct-blow command is used to instruct the air conditioner to enter the anti-direct-blow mode. In the anti-direct-blow mode, the speed of the air conditioner's upper fan increases by a first preset value, and the speed of the air conditioner's lower fan decreases by a second preset value. In the anti-direct-blow mode, the pipe temperature of each branch of the evaporator of the air conditioner is obtained within a first predetermined time period, wherein each branch is a pipe through which the refrigerant flows in the evaporator. The system acquires the temperatures inside the intermediate pipes of the first heat exchange branch and the second heat exchange branch, which are located near the down fan, within the first predetermined time period. When the temperature inside the intermediate pipe of the first heat exchange branch is not greater than a first preset temperature within the first predetermined time period, or when the temperature inside the intermediate pipe of the second heat exchange branch is not greater than the first preset temperature within the first predetermined time period, and the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, the system adjusts the opening of the control valve of the air conditioner to regulate the amount of refrigerant entering the evaporator, thereby reducing the refrigerant heat exchange difference between different areas of the evaporator to a predetermined temperature difference threshold. The control valve is used to control... The amount of refrigerant entering the evaporator, wherein, when it is determined that the pipe temperature of each of the branches reaches the start-up temperature of the refrigerant flow path adjustment mode, the opening of the control valve of the air conditioner is adjusted, including: controlling the three-way valve of the air conditioner to be energized and reversed, so that the refrigerant flows from the refrigerant bypass pipe of the evaporator into at least two refrigerant inlet branches of each of the branches, wherein the three-way valve is located on the refrigerant outlet side of the evaporator and is used to control the flow direction of the refrigerant in a portion of the refrigerant outlet branches of each of the branches, the flow direction including one of the following: the refrigerant bypass pipe, the pipe where the main refrigerant outlet is located, the bypass pipe being used to transport the refrigerant in the portion of the refrigerant outlet branches to the at least two refrigerant inlet branches; Specifically, when it is determined that the pipe temperature of each of the branches reaches the start-up temperature of the refrigerant flow path adjustment mode, the opening of the control valve of the air conditioner is adjusted, including: obtaining the outlet air temperature at the second guide grille corresponding to the down fan; determining the second preset temperature at the second guide grille corresponding to the down fan; determining the first temperature difference between the outlet air temperature at the second guide grille and the second preset temperature, and simultaneously determining the second temperature difference between the pipe temperatures of each of the branches; determining the target opening of the control valve based on the first temperature difference and the second temperature difference; controlling the opening of the control valve to adjust to the target opening to adjust the amount of refrigerant entering the evaporator, thereby reducing the difference in refrigerant heat exchange in different areas of the evaporator; This also includes: when the first temperature difference indicates that the temperature difference between the outlet air temperature at the second guide grille and the second preset temperature is not less than the third preset temperature within the second predetermined time period, the control valve is controlled to close.

2. The method for preventing direct airflow in an air conditioner according to claim 1, characterized in that, Upon receiving a direct-blow protection command, the air conditioner is controlled to enter direct-blow protection mode, including: Control the first guide grille corresponding to the upper fan and the second guide grille corresponding to the lower fan to rotate to the set position in the anti-direct-blow mode; Obtain the first current rotational speed of the upper fan, and simultaneously obtain the second current rotational speed of the lower fan; Determine the first target speed of the upper fan in the anti-direct-blow mode, and simultaneously determine the second target speed of the lower fan in the anti-direct-blow mode; The first preset value is determined based on the first target speed and the first current speed, and the second preset value is determined based on the second target speed and the second target speed. The upper fan is controlled to increase the first preset value based on the first current speed, while the lower fan is controlled to decrease the second preset value based on the second current speed.

3. The method for preventing direct airflow in an air conditioner according to claim 1, characterized in that, Also includes: After the three-way valve is continuously energized for a set time, if the temperature inside the middle pipe of the first heat exchange branch and the middle pipe of the second heat exchange branch near the down fan are both not less than the set temperature, or the temperature difference between the outlet air temperature at the second guide grille corresponding to the down fan and the second preset temperature at the second guide grille is not greater than the temperature threshold, the air conditioner is controlled to exit the refrigerant flow path adjustment mode. When exiting the refrigerant flow path adjustment mode, the control valve is opened to the maximum opening degree and the three-way valve is de-energized.

4. The method for preventing direct airflow in an air conditioner according to claim 1, characterized in that, Also includes: When it is determined that the pipe temperature of any three branches in each of the branches does not exceed a fourth preset temperature within a first preset time period, the air conditioner is controlled to enter the anti-freeze protection mode. In the anti-freeze protection mode, the compressor and outdoor fan of the air conditioner stop running, while the indoor fan and the sweeping fan of the air conditioner remain in their current state.

5. The method for preventing direct airflow in an air conditioner according to claim 4, characterized in that, Also includes: The total duration for which the air conditioner enters the anti-freeze protection mode is recorded; Under the anti-freeze protection mode, the pipe temperature of each branch is obtained within a third predetermined time period; When the total duration of the air conditioner operating in the anti-freeze protection mode reaches a predetermined duration, and the pipe temperature during the third predetermined time period is not lower than the fifth preset temperature, the air conditioner is controlled to exit the anti-freeze protection mode.

6. A direct-blow protection control device for an air conditioner, characterized in that, include: The control unit is used to control the air conditioner to enter the anti-direct-blow mode when it receives an anti-direct-blow command. The anti-direct-blow command is used to instruct the air conditioner to enter the anti-direct-blow mode. In the anti-direct-blow mode, the speed of the air conditioner's upper fan increases by a first preset value, and the speed of the air conditioner's lower fan decreases by a second preset value. The acquisition unit is used to acquire the pipe temperature of each branch of the evaporator of the air conditioner during a first predetermined time period in the anti-direct-blow mode, wherein each branch is a pipe through which the refrigerant flows in the evaporator. An adjustment unit is configured to acquire the temperatures inside the intermediate pipes of the first heat exchange branch and the second heat exchange branch near the down fan within the first predetermined time period; when the temperature inside the intermediate pipe of the first heat exchange branch is not greater than a first preset temperature within the first predetermined time period, or when the temperature inside the intermediate pipe of the second heat exchange branch is not greater than the first preset temperature within the first predetermined time period, and the pipe temperature of each branch reaches the start-up temperature of the refrigerant flow path adjustment mode, the unit adjusts the opening of the control valve of the air conditioner to adjust the amount of refrigerant entering the evaporator, so that the refrigerant heat exchange difference in each area of ​​the evaporator is reduced to a predetermined temperature difference threshold. The control valve is used to... To control the amount of refrigerant entering the evaporator, wherein, when it is determined that the pipe temperature of each of the branches reaches the start-up temperature of the refrigerant flow path adjustment mode, the opening of the control valve of the air conditioner is adjusted, including: controlling the three-way valve of the air conditioner to be energized and reversed, so that the refrigerant flows from the refrigerant bypass pipe of the evaporator into at least two refrigerant inlet branches of each of the branches, wherein the three-way valve is located on the refrigerant outlet side of the evaporator and is used to control the flow direction of the refrigerant in a portion of the refrigerant outlet branches of each of the branches, the flow direction including one of the following: the refrigerant bypass pipe, the pipe where the main refrigerant outlet is located, the bypass pipe being used to transport the refrigerant in the portion of the refrigerant outlet branches to the at least two refrigerant inlet branches; The adjustment unit includes: a third acquisition module for acquiring the outlet air temperature at the second guide grille corresponding to the downflow fan; a fourth determination module for determining a second preset temperature at the second guide grille corresponding to the downflow fan; a fifth determination module for determining a first temperature difference between the outlet air temperature at the second guide grille and the second preset temperature, and simultaneously determining a second temperature difference between the pipe temperatures of each branch; a sixth determination module for determining a target opening degree of the control valve based on the first temperature difference and the second temperature difference; and a fourth control module for controlling the opening degree of the control valve to adjust to the target opening degree, thereby adjusting the amount of refrigerant entering the evaporator and reducing the difference in refrigerant heat exchange in different areas of the evaporator. The air conditioner's anti-direct-blow control device further includes a fifth control module, used to control the control valve to close when the temperature difference between the outlet air temperature at the second air guide grille and the second preset temperature is not less than the third preset temperature within a second predetermined time period, as indicated by the first temperature difference value.

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