Defrosting control method and device, air conditioner and computer readable storage medium

Abstract

The embodiment of the invention provides a defrosting control method and device, an air conditioner and a computer readable storage medium, and the defrosting control method comprises the steps that in response to reversing of a reversing valve and defrosting operation of the air conditioner, an indoor air guide plate is controlled to be closed; and after the indoor air guide plate is closed, the indoor fan is controlled to be started and operate at the preset rotating speed.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and in particular to a defrost control method, device, air conditioner and computer-readable storage medium. Background Art

[0002] In the related art, when the air conditioner ends the reverse cycle defrosting, the reversing valve needs to be reversed. There is a large pressure difference before and after the reversing of the reversing valve, which is easy to generate a large noise and transmit it to the room, causing a large noise disturbance to the user. Summary of the invention

[0003] The embodiments of the present application provide a defrost control method, device, air conditioner and computer-readable storage medium, which can eliminate or at least significantly reduce the switching noise of the reversing valve when the air conditioner ends reverse cycle defrosting, thereby improving the user experience.

[0004] In a first aspect, an embodiment of the present application provides a defrost control method, wherein the air conditioner is provided with a compressor, a reversing valve, an indoor air guide plate and an indoor fan, and the defrost control method comprises: in response to the reversing of the reversing valve and the air conditioner entering a defrost operation, controlling the indoor air guide plate to close; after the indoor air guide plate is closed, controlling the indoor fan to start and run at a preset speed; determining whether a condition for ending the defrost operation is met; in response to determining that the condition for ending the defrost operation is met, controlling the reversing valve to reverse again.

[0005] In some embodiments, the reversing valve is reversed and the air conditioner enters defrost operation, including: in response to meeting the defrost operation conditions, controlling the compressor to stop or reduce the frequency to a preset reversing frequency, and controlling the indoor fan to stop; after the compressor stops or reduces the frequency to a preset reversing frequency, and the indoor fan stops, controlling the reversing valve to reverse; after the reversing valve is reversed, controlling the compressor to start or increase the frequency from the preset reversing frequency to operate.

[0006] In some embodiments, controlling the compressor to start or to increase the frequency from the preset switching frequency to operate includes: determining whether the outdoor ambient humidity is less than or equal to a humidity threshold; in response to determining that the outdoor ambient humidity is less than or equal to the humidity threshold, controlling the compressor to start and operate at a first preset frequency, or controlling the compressor to increase the frequency from the preset switching frequency to a first preset frequency; in response to determining that the outdoor ambient humidity is greater than the humidity threshold, controlling the compressor to start and operate at a second preset frequency, or controlling the compressor to increase the frequency from the preset switching frequency to a second preset frequency; the first preset frequency is less than the second preset frequency, and the first preset frequency is greater than the preset switching frequency.

[0007] In some embodiments, the air conditioner is provided with an electronic expansion valve; after controlling the compressor to start or to increase the frequency from the preset switching frequency, the switching valve is switched and the air conditioner enters the defrost operation including: determining whether the outdoor ambient humidity is less than or equal to a humidity threshold; in response to determining that the outdoor ambient humidity is less than or equal to the humidity threshold, controlling the electronic expansion valve to operate at a first preset opening; in response to determining that the outdoor ambient humidity is greater than the humidity threshold, controlling the electronic expansion valve to operate at a second preset opening; the first preset opening is less than the second preset opening.

[0008] In some embodiments, after controlling the reversing valve to reverse again, the defrost control method includes: after a first preset time has passed since the reversing valve reversed again, controlling the indoor fan to turn off and determining whether the cold wind protection condition is met; in response to determining that the cold wind protection condition is met, controlling the indoor fan to start and controlling the indoor air guide plate to open.

[0009] In some embodiments, determining whether the anti-cold wind condition is met includes: determining whether the indoor heat exchanger temperature is greater than or equal to a temperature threshold; in response to determining that the indoor heat exchanger temperature is greater than or equal to the temperature threshold, determining that the anti-cold wind condition is met; in response to determining that the indoor heat exchanger temperature is less than the temperature threshold, determining that the anti-cold wind condition is not met.

[0010] In some embodiments, after determining that the defrost operation end condition is met and before controlling the reversing valve to reverse again, the defrost control method includes: controlling the compressor to stop or reduce the frequency to a preset reversing frequency.

[0011] In a second aspect, an embodiment of the present application provides a defrost control device, comprising a first control circuit, which is configured to perform the following operations: in response to the air conditioner entering a defrost operation, controlling the indoor air guide plate to close; after the indoor air guide plate is closed, controlling the indoor fan to start and run at a preset speed.

[0012] In a third aspect, an embodiment of the present application provides an air conditioner, comprising: a compressor, a reversing valve, an indoor air guide plate and an indoor fan; a memory storing a computer program; and a processor, wherein the computer program, when executed by the processor, implements the defrost control method provided in any of the above embodiments.

[0013] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is loaded by a processor to execute the steps in the defrost control method described above.

[0014] The defrost control method provided in the embodiment of the present application sequentially controls the indoor air guide plate to close and the indoor fan to start running after the reversing valve is reversed and the air conditioner enters the defrost operation, and utilizes the indoor fan to continuously inhale indoor air to exchange heat with the indoor heat exchanger, thereby maintaining a high pressure in the indoor heat exchanger during the defrost operation and preventing the air conditioner from blowing cold air into the room; and after the air conditioner ends the defrost operation and the reversing valve is reversed again, the high-temperature and high-pressure gaseous refrigerant output by the compressor will flow to the indoor heat exchanger through the reversing valve, and the indoor heat exchanger is still in a high-pressure state after the reversing valve is reversed, so the pressure difference of the indoor heat exchanger before and after the reversing valve is reversed is not much, which can effectively eliminate or at least reduce to a large extent the pressure difference of the reversing valve before and after the reversing, thereby eliminating or at least reducing to a large extent the switching noise caused by the large pressure difference before and after the reversing, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a flow chart of a defrost control method provided by some embodiments of the present application;

[0017] Figure 2 is a partial flow chart of a defrost control method provided by some embodiments of the present application;

[0018] Figure 3 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0019] Figure 4 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0020] Figure 5 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0021] Figure 6 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0022] Figure 7 is another partial flow chart of the defrost control method provided by some embodiments of the present application;

[0023] Figure 8 This is a connection structure diagram of an air conditioner provided in some embodiments of the present application.

[0024] Description of main component symbols:

[0025] 1-air conditioner, 10-compressor, 20-reversing valve, 30-indoor heat exchanger, 40-outdoor heat exchanger, 50-indoor fan, 60-indoor air guide plate, 70-indoor air outlet, 80-electronic expansion valve. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0028] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0029] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0030] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0031] like Figure 1 As shown, in the first aspect, an embodiment of the present application provides a defrost control method for performing defrost control on an air conditioner 1. The defrost control method includes S20 to S50, which can eliminate or at least significantly reduce the switching noise of the reversing valve 20 when the air conditioner 1 ends the reverse cycle defrosting, thereby improving the user experience.

[0032] like Figure 8 As shown, here, the air conditioner 1 is provided with a compressor 10, a reversing valve 20, an indoor air guide plate 60 and an indoor fan 50, and the indoor air guide plate 60 is used to open or close the indoor air outlet 70. In addition, the air conditioner 1 is also provided with an indoor heat exchanger 30 and an outdoor heat exchanger 40, the indoor heat exchanger 30 is located on the indoor side, and the outdoor heat exchanger 40 is located on the outdoor side. The type of the air conditioner 1 can be determined according to actual needs, and can be, for example, a wall-mounted air conditioner, a cabinet air conditioner, a window air conditioner, etc., which is not limited in the embodiments of the present application.

[0033] S20: In response to the reversing of the reversing valve 20 and the air conditioner 1 entering the defrosting operation, the indoor air guide plate 60 is controlled to be closed.

[0034] Before the reversing valve 20 is switched, the air conditioner 1 is in the heating operation mode. The refrigerant output by the compressor 10 first enters the reversing valve 20 and is discharged from the other valve port of the reversing valve 20. After flowing through the indoor heat exchanger 30 and the outdoor heat exchanger 40 in sequence, it returns to the reversing valve 20 from another valve port of the reversing valve 20, and then returns to the compressor 10 through the reversing valve 20.

[0035] After the reversing valve 20 is reversed, the air conditioner 1 can enter the defrosting operation. The refrigerant output by the compressor 10 first enters the reversing valve 20 and is discharged from the other valve port of the reversing valve 20. After passing through the outdoor heat exchanger 40 and the indoor heat exchanger 30 in sequence, it returns to the reversing valve 20 from another valve port of the reversing valve 20 and returns to the compressor 10 through the reversing valve 20. At this time, the refrigerant condenses and defrosts in the outdoor heat exchanger 40, and evaporates and absorbs heat in the indoor heat exchanger 30. When the indoor air guide plate 60 is closed, the indoor air outlet 70 is in a closed state to prevent the indoor air outlet 70 from blowing cold air into the room during the defrosting process.

[0036] S30: After the indoor air guide plate 60 is closed, the indoor fan 50 is controlled to start and run at a preset speed.

[0037] After the indoor air guide plate 60 is closed, the indoor fan 50 can be controlled to start, so as to draw indoor air into the indoor side of the air conditioner 1, and use the continuously drawn indoor air and the indoor heat exchanger 30 for heat exchange, so that the refrigerant continuously evaporates and absorbs heat in the indoor heat exchanger 30, so that the refrigerant continuously transforms into low-temperature and high-pressure steam in the indoor heat exchanger 30, thereby making the indoor heat exchanger 30 always maintain a high pressure during the defrosting operation. The value of the preset speed can be determined according to actual needs, and the embodiment of the present application does not limit this; for example, the preset speed can be the minimum speed of the indoor fan 50.

[0038] S40: Determine whether the defrosting operation end condition is met.

[0039] During the defrost operation of the air conditioner 1, it can continuously monitor whether the defrost operation end conditions are met, so that the defrost can be terminated in time when the defrost operation end conditions are met, so that the air conditioner 1 can resume heating to better meet the user's heating needs.

[0040] S50: In response to determining that the defrosting operation end condition is satisfied, the reversing valve 20 is controlled to be reversed again.

[0041] When it is determined that the defrosting operation end condition is met, the reversing valve 20 can be controlled to reverse again, so that the refrigerant in the air conditioner 1 is reversed again and enters the heating cycle, so that the air conditioner 1 switches back to the heating operation. Before the reversing valve 20 is reversed again, the refrigerant in the indoor heat exchanger 30 is low-temperature and high-pressure steam, so that the indoor heat exchanger 30 maintains a relatively high pressure during the defrosting operation; and after the reversing valve 20 is reversed again, the high-temperature and high-pressure gaseous refrigerant output by the compressor 10 flows to the indoor heat exchanger 30 through the reversing valve 20, so that the indoor heat exchanger 30 still maintains a high pressure state close to that before the reversing valve 20 is reversed, which can eliminate or at least greatly reduce the pressure difference of the indoor heat exchanger 30 before and after the reversing valve 20, thereby effectively eliminating or at least greatly reducing the pressure difference of the reversing valve 20 before and after the reversing, thereby eliminating or at least greatly reducing the reversing noise caused by the large pressure difference before and after the reversing, and improving the user experience.

[0042] Compared with the related art, the defrost control method provided in the embodiment of the present application sequentially controls the indoor air guide plate 60 to close and the indoor fan 50 to start operation after the reversing valve 20 is reversed and the air conditioner 1 enters the defrost operation, and utilizes the indoor fan 50 to continuously inhale indoor air to exchange heat with the indoor heat exchanger 30, thereby maintaining a high pressure in the indoor heat exchanger 30 during the defrost operation and preventing the air conditioner 1 from blowing cold air into the room; and after the air conditioner 1 ends the defrost operation and the reversing valve 20 is reversed again, the high-temperature and high-pressure gaseous refrigerant output by the compressor 10 will flow to the indoor heat exchanger 30 through the reversing valve 20, and the indoor heat exchanger 30 is still in a high-pressure state after the reversing valve 20 is reversed, so the pressure difference of the indoor heat exchanger 30 before and after the reversing valve 20 is not much, which can effectively eliminate or at least greatly reduce the pressure difference of the reversing valve 20 before and after the reversing, thereby eliminating or at least greatly reducing the reversing noise caused by the large pressure difference before and after the reversing, thereby improving the user experience.

[0043] like Figure 2 As shown, in some embodiments, before S20, the defrost control method may include S11 to S13 to make the reversing valve 20 reverse and make the air conditioner 1 enter the defrost operation.

[0044] S11: In response to the defrosting operation condition being met, the compressor 10 is controlled to stop or reduce the frequency to a preset switching frequency, and the indoor fan 50 is controlled to stop.

[0045] When the defrosting operation conditions are met, it means that the frost on the outdoor heat exchanger 40 has had a significant impact on the normal heating of the air conditioner 1, and defrosting is required as soon as possible. At this time, the compressor 10 and the indoor fan 50 can be controlled to shut down respectively, so that the reversing valve 20 can be safely reversed when the compressor 10 is shut down; or, the operating frequency of the compressor 10 can be controlled to be lower than the preset reversing frequency, and the indoor fan 50 can be controlled to shut down, so that the reversing valve 20 can be reversed in a safe state without the compressor 10 shutting down. The preset reversing frequency can be pre-set in the air conditioner 1, and the specific value of the preset reversing frequency can be determined according to actual needs, and the embodiment of the present application does not limit this.

[0046] S12: After the compressor 10 is stopped or the frequency is reduced to a preset reversing frequency, and the indoor fan 50 is stopped, the reversing valve 20 is controlled to be reversing.

[0047] S13: After the reversing valve 20 is reversed, the compressor 10 is controlled to start or to increase the frequency from the preset reversing frequency. If the compressor 10 is in a stopped state at this time, the compressor 10 can be controlled to start and operate at a preset frequency; if the compressor 10 is operating at a preset reversing frequency at this time, the operating frequency of the compressor 10 can be controlled to increase from the preset reversing frequency to the preset frequency.

[0048] By setting S11 to S13, it can be ensured that the reversing valve 20 is reversed in a safe state, thereby increasing the safety and reliability of the air conditioner 1 during reversal.

[0049] In some examples, the preset frequency may include a first preset frequency and a second preset frequency. The first preset frequency and the second preset frequency may be pre-set in the air conditioner 1 and may be set according to different frosting severity and frost layer thickness. The first preset frequency is less than the second preset frequency, so that the compressor 10 may perform different operating states according to different frosting conditions, thereby matching different defrosting heat requirements and pressure requirements. Figure 3 As shown, here, S13 may include S131 to S133.

[0050] S131: Determine whether the outdoor ambient humidity is less than or equal to a humidity threshold.

[0051] Here, the outdoor environment humidity can be measured in real time by a humidity sensor or a temperature and humidity sensor disposed outdoors, or can be obtained through a data network such as the Internet. The humidity threshold can be pre-set in the air conditioner 1 to determine the level of outdoor environment humidity, and further can be used to determine the severity of frost and the thickness of the frost layer on the outdoor heat exchanger 40.

[0052] S132: In response to determining that the outdoor ambient humidity is less than or equal to the humidity threshold, controlling the compressor 10 to start and operate at a first preset frequency, or controlling the compressor 10 to increase the frequency from the preset switching frequency to the first preset frequency.

[0053] S133: In response to determining that the outdoor ambient humidity is greater than the humidity threshold, controlling the compressor 10 to start and operate at a second preset frequency, or controlling the compressor 10 to increase the frequency from the preset switching frequency to the second preset frequency.

[0054] When the outdoor ambient humidity is less than or equal to the humidity threshold, it indicates that the severity of frost on the outdoor heat exchanger 40 is relatively light and the thickness of the frost layer is relatively small. If the compressor 10 is in a shutdown state at this time, the compressor 10 can be controlled to start and operate at a first preset frequency with a smaller frequency; if the compressor 10 is operating at a preset reversing frequency at this time, the operating frequency of the compressor 10 can be controlled to increase from the preset reversing frequency to the first preset frequency with a smaller frequency. The operating frequency of the compressor 10 is set to be relatively small. On the one hand, it can match the current smaller defrosting heat demand and avoid power consumption waste. On the other hand, it can reduce the output pressure of the compressor 10 and further reduce the pressure difference of the indoor heat exchanger 30 before and after the reversing valve 20, thereby effectively eliminating or at least greatly reducing the reversing noise caused by the large pressure difference before and after the reversing, and improving the user experience.

[0055] When the outdoor ambient humidity is greater than the humidity threshold, it indicates that the severity of frost on the outdoor heat exchanger 40 is relatively serious and the thickness of the frost layer is relatively large. If the compressor 10 is in a shutdown state at this time, the compressor 10 can be controlled to start and operate at a second preset frequency with a larger frequency; if the compressor 10 is operating at a preset reversing frequency at this time, the operating frequency of the compressor 10 can be controlled to increase from the preset reversing frequency to the second preset frequency with a larger frequency. The operating frequency of the compressor 10 is set to be relatively large, which can increase the output pressure and operating power of the compressor 10, thereby better matching and meeting the current large defrosting heat demand, and effectively and quickly eliminating the frost layer of the outdoor heat exchanger 40.

[0056] In some examples, the air conditioner 1 may be provided with an electronic expansion valve 80. The electronic expansion valve 80 may be provided between the outdoor heat exchanger 40 and the indoor heat exchanger 30, and is used to throttle and expand the refrigerant. When the air conditioner 1 is in the heating operation mode, the electronic expansion valve 80 is used to throttle the refrigerant output from the indoor heat exchanger 30, so that the refrigerant enters the outdoor heat exchanger 40 after throttling; when the air conditioner 1 is in the defrosting operation mode, the electronic expansion valve 80 is used to throttle the refrigerant output from the outdoor heat exchanger 40, so that the refrigerant enters the indoor heat exchanger 30 after throttling. Figure 4 As shown, here, the defrost control method may include S131 ′ to S133 ′.

[0057] S131': Determine whether the outdoor ambient humidity is less than or equal to a humidity threshold.

[0058] S132 ′: In response to determining that the outdoor ambient humidity is less than or equal to the humidity threshold, controlling the electronic expansion valve 80 to operate at a first preset opening degree.

[0059] S133 ′: In response to determining that the outdoor ambient humidity is greater than the humidity threshold, controlling the electronic expansion valve 80 to operate at a second preset opening degree.

[0060] Here, the first preset opening and the second preset opening can be pre-set in the air conditioner 1 and set according to different frosting severity and frost layer thickness. The first preset opening is smaller than the second preset opening, so that the electronic expansion valve 80 can perform different operating states according to different frosting conditions, thereby improving the evaporation heat absorption performance of the indoor heat exchanger 30, thereby matching the current defrosting heat demand.

[0061] When the outdoor ambient humidity is less than or equal to the humidity threshold, it indicates that the severity of frost on the outdoor heat exchanger 40 is low and the thickness of the frost layer is small. At this time, the electronic expansion valve 80 can be controlled to operate at a first preset opening with a smaller opening. The opening of the electronic expansion valve 80 is set to be smaller. On the one hand, it can match the current smaller defrosting heat demand and avoid power consumption. On the other hand, it can weaken the evaporation heat absorption effect of the indoor heat exchanger 30 and reduce the pressure of the indoor heat exchanger 30 during the defrosting operation, and further reduce the pressure difference of the indoor heat exchanger 30 before and after the reversing valve 20, thereby effectively eliminating or at least greatly reducing the reversing noise caused by the large pressure difference before and after the reversing, and improving the user experience.

[0062] When the outdoor ambient humidity is greater than the humidity threshold, it indicates that the frost on the outdoor heat exchanger 40 is more serious and the thickness of the frost layer is larger. At this time, the electronic expansion valve 80 can be controlled to operate at a second preset opening with a larger opening. The opening of the electronic expansion valve 80 is set to be larger, which can increase the evaporation heat absorption effect of the indoor heat exchanger 30, thereby matching the current larger defrosting heat demand, increasing the condensation defrosting effect of the outdoor heat exchanger 40, and thus effectively and quickly eliminating the frost layer of the outdoor heat exchanger 40.

[0063] For example, when it is determined that the outdoor ambient humidity is less than or equal to the humidity threshold, the electronic expansion valve 80 may be controlled to operate at the first preset opening, but the compressor 10 may not be controlled to operate at the first preset frequency, that is, S132 is not executed, but only S132' is executed. When it is determined that the outdoor ambient humidity is greater than the humidity threshold, the electronic expansion valve 80 may be controlled to operate at the second preset opening, but the compressor 10 may not be controlled to operate at the second preset frequency, that is, S133 is not executed, and only S133' is executed.

[0064] For example, when it is determined that the outdoor ambient humidity is less than or equal to the humidity threshold, the compressor 10 may be controlled to operate at the first preset frequency, but the electronic expansion valve 80 may not be controlled to operate at the first preset opening, that is, only S132 is executed, but S132' is not executed. When it is determined that the outdoor ambient humidity is greater than the humidity threshold, the compressor 10 may be controlled to operate at the second preset frequency, but the electronic expansion valve 80 may not be controlled to operate at the second preset opening, that is, S133 is not executed, and only S133' is executed.

[0065] As another example, when it is determined that the outdoor ambient humidity is less than or equal to the humidity threshold, the electronic expansion valve 80 can be controlled to operate at a first preset opening, and the compressor 10 can be controlled to start and operate at a first preset frequency, or to increase the frequency from a preset switching frequency to a first preset frequency, that is, S132 and S132' are executed respectively. When it is determined that the outdoor ambient humidity is greater than the humidity threshold, the electronic expansion valve 80 can be controlled to operate at a second preset opening, and the compressor 10 can be controlled to start and operate at a second preset frequency, or to increase the frequency from a preset switching frequency to a second preset frequency, that is, S133 and S133' are executed respectively. Figure 5 As shown, here, S13 may include S131, S1320 and S1330, S1320 may include the execution steps of S132 and S132', and S1330 may include the execution steps of S133 and S133'.

[0066] like Figure 6 As shown, in some embodiments, after S50 , the defrost control method may include S60 ˜ S70 .

[0067] S60: After the first preset time has passed since the reversing valve 20 is reversed again, the indoor fan 50 is controlled to be turned off and it is determined whether the cold wind prevention condition is met. Here, the first preset time can be pre-set in the air conditioner 1 to control the time interval between the reversing valve 20 and the turning off of the indoor fan 50. The value of the first preset time can be determined according to actual needs, and the embodiment of the present application is not limited to this; for example, the first preset time can be taken as different time values ​​such as 30s, 1min, etc.

[0068] After the reversing valve 20 is reversed again, the air conditioner 1 re-enters the heating operation mode. The refrigerant output by the compressor 10 first enters the reversing valve 20 and is discharged from the other valve port of the reversing valve 20, and then returns to the reversing valve 20 from another valve port of the reversing valve 20 after passing through the indoor heat exchanger 30 and the outdoor heat exchanger 40 in sequence, and then returns to the compressor 10 through the reversing valve 20. In this process, the refrigerant condenses and absorbs heat in the indoor heat exchanger 30, and evaporates and absorbs heat in the outdoor heat exchanger 40; since the indoor fan 50 is still in operation, the indoor fan 50 can continue to draw indoor air into the indoor side, so as to heat up the indoor air in advance before the indoor air guide plate 60 is reopened, and quickly increase the air temperature in the indoor side.

[0069] After the first preset time has passed since the reversing valve 20 was reversed again, the refrigerant in the air conditioner 1 has completed a smooth reversal, and the air temperature in the indoor side has risen to a large extent. At this time, the indoor fan 50 can be controlled to be turned off, and the indoor air is no longer sucked into the indoor side; and it is determined whether the cold wind prevention condition is met to prevent the air conditioner 1 from blowing cold wind into the room, thereby ensuring the comfort of the indoor environment.

[0070] S70: In response to determining that the cold wind prevention condition is met, the indoor fan 50 is controlled to start and the indoor air guide plate 60 is controlled to open. When it is determined that the cold wind prevention condition is met, it means that the air temperature on the indoor side is high and the heating performance of the indoor heat exchanger 30 is good. The indoor fan 50 can be controlled to start, and the indoor air guide plate 60 can be controlled to open the indoor air outlet 70 to inhale the indoor air and blow the indoor air into the room, so that the indoor air environment becomes warmer.

[0071] like Figure 7 As shown, in some examples, S40 may include S41 to S43.

[0072] S41: Determine whether the temperature of the indoor heat exchanger 30 is greater than or equal to a temperature threshold. Here, the temperature threshold can be pre-set in the air conditioner 1 to determine the heating performance of the indoor heat exchanger 30. The value of the temperature threshold can be determined according to actual needs, and the embodiment of the present application does not limit this. For example, the temperature of the indoor heat exchanger 30 can be the indoor coil temperature.

[0073] S42: In response to determining that the temperature of the indoor heat exchanger 30 is greater than or equal to the temperature threshold, it is determined that the cold wind prevention condition is met. When it is determined that the temperature of the indoor heat exchanger 30 is greater than or equal to the temperature threshold, it means that the heating performance of the indoor heat exchanger 30 is good and sufficient to meet the current indoor heating demand; at this time, it can be determined that the cold wind prevention condition has been met, and then the indoor fan 50 can be controlled to start and the indoor air guide plate 60 can be controlled to open.

[0074] S43: In response to determining that the temperature of the indoor heat exchanger 30 is less than the temperature threshold, it is determined that the cold wind prevention condition is not met. When it is determined that the temperature of the indoor heat exchanger 30 is less than the temperature threshold, it means that the heating performance of the indoor heat exchanger 30 is poor and is not enough to meet the current indoor heating demand; at this time, it can be determined that the cold wind prevention condition is not met, and it is necessary to control the indoor fan 50 and the indoor air guide plate 60 to remain closed.

[0075] In some examples, after determining that the defrost operation end condition is satisfied and before controlling the reversing valve 20 to be reversed again, the defrost control method may include S405 .

[0076] S405: Control the compressor 10 to stop or reduce the frequency to a preset reversing frequency. Here, the compressor 10 may be controlled to stop so that the reversing valve 20 can be safely reversed when the compressor 10 is stopped; or, the operating frequency of the compressor 10 may be controlled to be lower than the preset reversing frequency so that the reversing valve 20 can be reversed in a safe state without stopping the compressor 10.

[0077] In the second aspect, an embodiment of the present application provides a defrost control device, which includes a first control circuit, and the first control circuit is configured to perform the following operations: in response to the air conditioner 1 entering the defrost operation, the indoor air guide plate 60 is controlled to be closed; after the indoor air guide plate 60 is closed, the indoor fan 50 is controlled to start and run at a preset speed.

[0078] In a third aspect, an embodiment of the present application provides an air conditioner 1, which includes a compressor 10, a reversing valve 20, an indoor air guide plate 60, an indoor fan 50, a processor and a memory. The memory stores a computer program, and when the computer program is executed by the processor, the defrost control method provided in any of the above embodiments is implemented. In addition, the air conditioner 1 is also provided with an indoor heat exchanger 30 and an outdoor heat exchanger 40, the indoor heat exchanger 30 is located on the indoor side, and the outdoor heat exchanger 40 is located on the outdoor side. The type of the air conditioner 1 can be determined according to actual needs, and can be, for example, a wall-mounted air conditioner, a cabinet air conditioner, a window air conditioner, etc., which is not limited by the embodiment of the present application.

[0079] The processor is connected to the memory and can perform various actions and processes according to the program stored in the memory. Specifically, the processor can be an integrated circuit chip with signal processing capabilities. The above-mentioned processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., which can be an X86 architecture or an ARM architecture.

[0080] The memory may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronously linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that the memory of the method described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0081] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored. The computer program is loaded by a processor to execute the steps in the control method of any of the above embodiments.

[0082] Exemplarily, the above-mentioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., CDs (Compact Disks), DVDs (Digital Versatile Disks), etc.), smart cards and flash memory devices (e.g., EPROMs (Erasable Programmable Read-Only Memory), cards, sticks or key drives, etc.). The various computer-readable storage media described in the embodiments of the present application may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0083] The above is a detailed introduction to a defrost control method, device, air conditioner and computer-readable storage medium provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A defrosting control method, characterized in that: The air conditioner is provided with a compressor, a reversing valve, an indoor air guide plate and an indoor fan, and the defrosting control method comprises: In response to the reversing of the reversing valve and the air conditioner entering a defrosting operation, controlling the indoor air guide plate to close; After the indoor air guide plate is closed, controlling the indoor fan to start and run at a preset speed; Determine whether the defrost operation end condition is met; In response to determining that the defrost operation end condition is satisfied, the reversing valve is controlled to be reversed again.

2. The defrosting control method according to claim 1, characterized in that: The reversing valve is reversed and the air conditioner enters the defrosting operation, comprising: In response to satisfying the defrosting operation condition, controlling the compressor to stop or reduce the frequency to a preset switching frequency, and controlling the indoor fan to stop; After the compressor stops or reduces the frequency to a preset reversing frequency, and the indoor fan stops, controlling the reversing valve to reversing; After the reversing valve is switched, the compressor is controlled to start or to increase the frequency from the preset reversing frequency.

3. The defrosting control method according to claim 2, characterized in that: Controlling the compressor to start or increase the frequency from the preset switching frequency includes: Determine whether the outdoor ambient humidity is less than or equal to a humidity threshold; In response to determining that the outdoor ambient humidity is less than or equal to a humidity threshold, controlling the compressor to start and operate at a first preset frequency, or controlling the compressor to increase the frequency from the preset switching frequency to the first preset frequency; In response to determining that the outdoor environment humidity is greater than a humidity threshold, controlling the compressor to start and operate at a second preset frequency, or controlling the compressor to increase the frequency from the preset switching frequency to a second preset frequency; The first preset frequency is less than the second preset frequency, and the first preset frequency is greater than the preset commutation frequency.

4. The defrosting control method according to claim 2, characterized in that: The air conditioner is provided with an electronic expansion valve; after the compressor is controlled to start or to run at an increased frequency from the preset switching frequency, the switching valve is switched and the air conditioner enters a defrosting operation, including: Determine whether the outdoor ambient humidity is less than or equal to a humidity threshold; In response to determining that the outdoor ambient humidity is less than or equal to a humidity threshold, controlling the electronic expansion valve to operate at a first preset opening degree; In response to determining that the outdoor ambient humidity is greater than a humidity threshold, controlling the electronic expansion valve to operate at a second preset opening degree; The first preset opening degree is smaller than the second preset opening degree.

5. The defrosting control method according to claim 1, characterized in that: After controlling the reversing valve to reverse again, the defrosting control method includes: After a first preset time has passed since the reversing valve is switched, the indoor fan is controlled to be turned off and it is determined whether a cold wind prevention condition is met; In response to determining that the cold wind protection condition is met, the indoor fan is controlled to start and the indoor air guide plate is controlled to open.

6. The defrosting control method according to claim 5, characterized in that: Determine whether the cold wind protection conditions are met, including: Determine whether the indoor heat exchanger temperature is greater than or equal to a temperature threshold; In response to determining that the temperature of the indoor heat exchanger is greater than or equal to the temperature threshold, determining that the cold wind prevention condition is met; In response to determining that the indoor heat exchanger temperature is less than the temperature threshold, it is determined that the cold wind prevention condition is not satisfied.

7. The defrosting control method according to claim 1, characterized in that: After determining that the defrost operation end condition is met and before controlling the reversing valve to reverse again, the defrost control method includes: The compressor is controlled to stop or reduce the frequency to a preset switching frequency.

8. A defrost control device, characterized in that: The air conditioner is provided with a compressor, a reversing valve, an indoor air guide plate and an indoor fan; the defrost control device comprises a first control circuit, and the first control circuit is configured to perform the following operations: In response to the air conditioner entering a defrosting operation, controlling the indoor air guide plate to close; After the indoor air guide plate is closed, the indoor fan is controlled to start and run at a preset speed.

9. An air conditioner, characterized in that: include: Compressor, reversing valve, indoor air guide plate and indoor fan; a memory storing a computer program; A processor, wherein when the computer program is executed by the processor, the defrost control method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in the defrost control method according to any one of claims 1 to 7.

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