Diverter defrosting control method, air conditioner and computer-readable storage medium

Abstract

This invention provides a split-flow defrosting control method, an air conditioner, and a computer-readable storage medium. The split-flow defrosting control method includes: entering a heating mode; determining whether the conditions for entering defrosting are met; if so, controlling the opening degree of a first throttling device and a second throttling device to defrost at least one of a first heat exchanger and a second heat exchanger; and when both the first and second heat exchangers require defrosting, defrosting the first and second heat exchangers one at a time; wherein, when the first heat exchanger is defrosting, the opening degree of the first throttling device is greater than the opening degree of the second throttling device, and when the second heat exchanger is defrosting, the opening degree of the first throttling device is less than the opening degree of the second throttling device. Applying the split-flow defrosting control method of this invention can maintain room temperature while the air conditioner is defrosting.

Description

Technical Field

[0001] This invention relates to the field of air conditioning defrosting technology, specifically to a split-flow defrosting control method, an air conditioner using the split-flow defrosting control method, and a computer-readable storage medium using the split-flow defrosting control method. Background Technology

[0002] Two key technical issues need to be addressed in defrosting air source heat pump air conditioners: (1) determining the time to enter defrost mode and exiting it at the appropriate time; (2) effectively and quickly defrosting, shortening defrost time, and reducing temperature fluctuations in the indoor environment caused by defrost. Existing air conditioner defrosting methods include: shutdown defrosting, electric heating defrosting, hot gas bypass defrosting, and reverse circulation defrosting. Overall, existing defrosting methods either require additional defrosting devices or require shutdown defrosting, neither of which adequately meets the key technical requirements for defrosting in air source heat pump air conditioners.

[0003] For example, in a current heat pump air conditioning system, the heat exchange circuit uses first and second outdoor unit heat exchangers connected in parallel. A first throttling device is installed at the common input terminal of the first and second outdoor unit heat exchangers, and a second throttling device is added before the second outdoor unit heat exchanger. During defrosting, if both the first and second outdoor unit heat exchangers frost simultaneously, the throttling effect of the first and second throttling devices is reduced, allowing for simultaneous defrosting of both. This simultaneous defrosting method leads to a decrease in heating efficiency, affecting heating comfort. To maintain indoor heating efficiency, auxiliary heating devices need to be added, increasing costs. Summary of the Invention

[0004] The primary objective of this invention is to provide a defrosting control method that maintains room temperature while defrosting an air conditioner.

[0005] The second objective of this invention is to provide an air conditioner that can maintain room temperature while defrosting.

[0006] A third objective of this invention is to provide a computer-readable storage medium that maintains room temperature while defrosting an air conditioner.

[0007] To achieve the aforementioned first objective, the decentralization defrosting control method provided by the present invention includes: entering a heating mode; determining whether the conditions for entering defrosting are met; if so, controlling the opening degree of the first throttling device and the opening degree of the second throttling device to defrost at least one of the first heat exchanger and the second heat exchanger; and when both the first heat exchanger and the second heat exchanger need to be defrosted, the first heat exchanger and the second heat exchanger are defrosted one by one; wherein, when the first heat exchanger is defrosted, the opening degree of the first throttling device is greater than the opening degree of the second throttling device, and when the second heat exchanger is defrosted, the opening degree of the first throttling device is less than the opening degree of the second throttling device.

[0008] As can be seen from the above scheme, the decanting defrosting control method of the present invention, after meeting the conditions for entering defrosting, defrosts at least one of the first heat exchanger and the second heat exchanger. When both the first heat exchanger and the second heat exchanger need to be defrosted, the first heat exchanger and the second heat exchanger are defrosted one by one. This can ensure that while one heat exchanger is defrosting, the other heat exchanger is still in the heating operation state, thereby achieving temperature maintenance while defrosting.

[0009] In a further embodiment, when the first heat exchanger defrosts, the opening of the first throttling device is adjusted to the maximum opening of the first throttling device, and the opening of the second throttling device is adjusted to the first preset opening, which is less than the maximum opening of the first throttling device.

[0010] Therefore, when the first heat exchanger defrosts, the opening of the first throttling device is adjusted to the maximum opening of the first throttling device, and the opening of the second throttling device is adjusted to the first preset opening. This allows the first heat exchanger to enter the defrosting stage, while the second heat exchanger maintains heating. It also ensures that the first heat exchanger defrosts at the maximum defrosting speed, thereby improving defrosting efficiency.

[0011] In a further embodiment, when the first heat exchanger defrosts, the following steps are also included: adjusting the speed of the indoor fan to a first preset speed; and / or adjusting the speed of the outdoor fan to a second preset speed; and / or adjusting the operating frequency of the compressor to a first preset frequency.

[0012] Therefore, it can be seen that during the defrosting of the first heat exchanger, the defrosting speed can be further accelerated by adjusting the speed of the indoor fan, the speed of the outdoor fan, and the operating frequency of the compressor.

[0013] In a further embodiment, when the first heat exchanger defrosts, the defrosting time of the first heat exchanger is controlled to be a first preset time.

[0014] Therefore, controlling the defrosting time of the first heat exchanger can optimize the total defrosting time.

[0015] In a further embodiment, when the second heat exchanger defrosts, the opening of the first throttling device is adjusted to the second preset opening, and the opening of the second throttling device is adjusted to the maximum opening of the second throttling device. The second preset opening is less than the maximum opening of the second throttling device.

[0016] Therefore, when the second heat exchanger defrosts, the opening of the first throttling device is adjusted to the second preset opening, and the opening of the second throttling device is adjusted to the maximum opening of the second throttling device. This allows the second heat exchanger to enter the defrosting state, while the first heat exchanger maintains heating. It also ensures that the second heat exchanger defrosts at the maximum defrosting speed, thereby improving defrosting efficiency.

[0017] In a further embodiment, when the second heat exchanger defrosts, the following steps are also included: adjusting the speed of the indoor fan to a third preset speed; and / or adjusting the speed of the outdoor fan to a fourth preset speed; and / or adjusting the operating frequency of the compressor to a second preset frequency.

[0018] Therefore, it can be seen that by adjusting the speed of the indoor fan, the speed of the outdoor fan, and the operating frequency of the compressor, the defrosting speed of the second heat exchanger can be further accelerated.

[0019] In a further embodiment, when the second heat exchanger defrosts, the defrosting time is controlled to be a second preset time.

[0020] Therefore, controlling the defrosting time of the second heat exchanger can optimize the total defrosting time.

[0021] In a further embodiment, the first heat exchanger is located above the second heat exchanger in the vertical direction; the step of controlling the opening of the first throttling device and the opening of the second throttling device to defrost the first heat exchanger and the second heat exchanger one by one also includes: controlling the first heat exchanger to defrost after defrosting is completed, and then controlling the second heat exchanger to defrost.

[0022] Therefore, when the first heat exchanger is located above the second heat exchanger in the vertical direction, the first heat exchanger is defrosted first, so that the high-temperature water droplets generated by defrosting fall onto the second heat exchanger, thus promoting the defrosting of the second heat exchanger.

[0023] In a further embodiment, after the step of defrosting the first heat exchanger and the second heat exchanger one by one, it also includes: controlling the opening degree of the first throttling device and the opening degree of the second throttling device to defrost the first heat exchanger and the second heat exchanger simultaneously.

[0024] Therefore, defrosting the first and second heat exchangers one by one, and then defrosting the first and second heat exchangers simultaneously, improves the defrosting effect.

[0025] In a further embodiment, the step of controlling the opening degree of the first throttling device and the opening degree of the second throttling device to simultaneously defrost the first heat exchanger and the second heat exchanger includes: adjusting the opening degree of the first throttling device to the maximum opening degree of the first throttling device, and adjusting the opening degree of the second throttling device to the maximum opening degree of the second throttling device.

[0026] Therefore, adjusting both the opening of the first throttling device and the opening of the second throttling device to their maximum opening can increase the defrosting speed.

[0027] In a further embodiment, the step of controlling the opening degree of the first throttling device and the opening degree of the second throttling device to defrost the first heat exchanger and the second heat exchanger simultaneously includes: adjusting the speed of the indoor fan to a fifth preset speed; and / or adjusting the speed of the outdoor fan to a sixth preset speed; and / or adjusting the operating frequency of the compressor to a third preset frequency.

[0028] Therefore, it can be seen that by adjusting the speed of the indoor fan, the speed of the outdoor fan, and the operating frequency of the compressor, the defrosting speed of the heat exchanger can be further accelerated.

[0029] In a further embodiment, the step of controlling the opening degree of the first throttling device and the opening degree of the second throttling device to simultaneously defrost the first heat exchanger and the second heat exchanger also includes: controlling the duration of simultaneous defrosting of the first heat exchanger and the second heat exchanger to a third preset duration.

[0030] Therefore, controlling the duration of simultaneous defrosting of the first and second heat exchangers can prevent excessively long defrosting times, which would affect the heating effect.

[0031] In a further scheme, the conditions for entering defrost include: the tube temperature of the first heat exchanger and / or the second heat exchanger is lower than the preset temperature; if the tube temperature of the first heat exchanger is lower than the preset temperature but the tube temperature of the second heat exchanger is not lower than the preset temperature, only the first heat exchanger is defrosted; if the tube temperature of the second heat exchanger is lower than the preset temperature but the tube temperature of the first heat exchanger is not lower than the preset temperature, only the second heat exchanger is defrosted; if the tube temperatures of both the first and second heat exchangers are lower than the preset temperature, the first and second heat exchangers are defrosted one by one.

[0032] Therefore, when one of the first and second heat exchangers needs to be defrosted, only the heat exchanger that needs to be defrosted can be defrosted. When both the first and second heat exchangers need to be defrosted, the first and second heat exchangers can be defrosted one by one. This ensures that while one heat exchanger is being defrosted, the other heat exchanger can continue to operate normally and maintain the heating effect in the room.

[0033] In a further step, after confirming that the tube temperatures of both the first and second heat exchangers are lower than the preset temperature, the system also confirms that the heating operation has reached the preset duration before defrosting each of the first and second heat exchangers.

[0034] Therefore, it can be seen that the tube temperatures of the first heat exchanger and the second heat exchanger are both lower than the preset temperature and the heating operation has reached the preset time. It can be considered that both the first and second heat exchangers are frosted and need to be defrosted.

[0035] To achieve the second objective of the present invention, the present invention provides an air conditioner including a processor and a memory, the memory storing a computer program, which, when executed by the processor, implements the steps of the above-described split-flow defrosting control method.

[0036] To achieve the third objective of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a controller, implements the steps of the above-described flow-diversion defrosting control method. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the system structure of an air conditioner using the current splitting defrosting control method of the present invention.

[0038] Figure 2 This is a flowchart of an embodiment of the flow splitting defrosting control method of the present invention.

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0040] The current-displacement defrosting control method of the present invention is an application program used in air conditioners to perform defrosting when the air conditioner is heating. In this embodiment, as shown... Figure 1 As shown, the air conditioner includes an indoor heat exchanger 1, a compressor 2, a first heat exchanger 3, a second heat exchanger 4, a first throttling device 5, and a second throttling device 6. The first heat exchanger 3 and the first throttling device 5 are connected in series to form a first flow path, and the second heat exchanger 4 and the second throttling device 6 are connected in series to form a second flow path. The first and second flow paths are connected in parallel and are located in the outdoor unit of the air conditioner. The indoor heat exchanger 1, the compressor 2, and the first and second flow paths form a refrigerant circuit. Preferably, the first throttling device 5 and the second throttling device 6 are electronic expansion valves. In addition, the air conditioner is also equipped with a temperature sensor for detecting the pipe temperature of the first heat exchanger 3 and the second heat exchanger 4. In this embodiment, the first heat exchanger 3 is located above the second heat exchanger 4 in the vertical direction.

[0041] Example of a flow-diversion defrosting control method:

[0042] like Figure 2 As shown in this embodiment, when the split-flow defrosting control method is in operation, it first executes step S1 to enter the heating mode. When heating is required, the user can send a heating mode control command to the air conditioner via a remote control or control panel, and the air conditioner will operate in heating mode according to the set parameters.

[0043] After entering heating mode, step S2 is executed to determine whether the conditions for entering defrost mode are met. During heating operation, the heat exchanger of the outdoor unit is prone to frost buildup, which leads to a decrease in the heating performance of the air conditioner. Therefore, it is necessary to determine the operating status of the air conditioner to confirm whether the heat exchanger is in a state of frost buildup requiring defrosting. The conditions for entering defrost mode include: the pipe temperature of the first heat exchanger and / or the pipe temperature of the second heat exchanger are lower than a preset temperature, and the heating operation has reached a preset duration. The preset temperature can be preset based on experimental data. In this embodiment, the conditions for entering defrost mode are: both the pipe temperature of the first heat exchanger and the pipe temperature of the second heat exchanger are lower than the preset temperature, and the heating operation has reached the preset duration. The pipe temperatures of the first and second heat exchangers are detected by a temperature sensor. When both the pipe temperatures of the first and second heat exchangers are lower than the preset temperature, it indicates that both the first and second heat exchangers are in a state of frost buildup requiring defrosting.

[0044] If the conditions for entering defrost are not met, proceed to step S1 for heating operation. If the conditions for entering defrost are met, proceed to step S3, controlling the opening of the first and second throttling devices to defrost at least one of the first and second heat exchangers. If both the first and second heat exchangers require defrosting, they are defrosted sequentially. Specifically, when the first heat exchanger is defrosting, the opening of the first throttling device is greater than that of the second throttling device; when the second heat exchanger is defrosting, the opening of the first throttling device is less than that of the second throttling device. By defrosting the first and second heat exchangers sequentially, it can be ensured that while one heat exchanger is defrosting, the other remains in heating operation, thus maintaining temperature during defrosting.

[0045] In this embodiment, the first heat exchanger is located vertically above the second heat exchanger. Therefore, the step of controlling the opening of the first throttling device and the second throttling device to defrost the first and second heat exchangers one by one further includes: controlling the first heat exchanger to complete defrosting before controlling the second heat exchanger to defrost. Since the first heat exchanger is located vertically above the second heat exchanger, controlling the first heat exchanger to defrost first allows the high-temperature water droplets generated during defrosting to fall onto the second heat exchanger, promoting the defrosting of the second heat exchanger.

[0046] In this embodiment, when the first heat exchanger defrosts, the opening of the first throttling device is adjusted to its maximum opening, and the opening of the second throttling device is adjusted to a first preset opening, which is less than the maximum opening of the first throttling device. The first preset opening is preset based on experimental data, and its value ranges from 80P to 200P; preferably, it is 120P.

[0047] During defrosting of the first heat exchanger, the process further includes: adjusting the indoor fan speed to a first preset speed; and / or adjusting the outdoor fan speed to a second preset speed; and / or adjusting the compressor operating frequency to a first preset frequency. The first preset speed, second preset speed, and first preset frequency are preset based on experimental data. The first preset speed ranges from the speeds corresponding to the silent mode, low fan speed, and medium fan speed; the second preset speed ranges from 20% to 60% of the rated maximum speed of the outdoor fan; and the first preset frequency ranges from 50Hz to 90Hz. Preferably, the first preset speed is the speed corresponding to the low fan speed, the second preset speed is 40% of the rated maximum speed of the outdoor fan, and the first preset frequency is 80Hz. In this embodiment, to accelerate defrosting, the indoor fan speed is simultaneously adjusted to the first preset speed, the outdoor fan speed is adjusted to the second preset speed, and the compressor operating frequency is adjusted to the first preset frequency.

[0048] In addition, the defrosting process of the first heat exchanger also includes controlling the defrosting time of the first heat exchanger to a first preset time. The first preset time is preset based on experimental data, and the value of the first preset time ranges from 10 seconds to 60 seconds. Preferably, the first preset time is 35 seconds.

[0049] In this embodiment, during defrosting of the second heat exchanger, the opening of the first throttling device is adjusted to a second preset opening, and the opening of the second throttling device is adjusted to its maximum opening. The second preset opening is less than the maximum opening of the second throttling device. The second preset opening is preset based on experimental data, and its value ranges from 100P to 220P. Preferably, the second preset opening is 150P.

[0050] During defrosting of the second heat exchanger, the process further includes: adjusting the indoor fan speed to a third preset speed; and / or adjusting the outdoor fan speed to a fourth preset speed; and / or adjusting the compressor operating frequency to a second preset frequency. The third preset speed, fourth preset speed, and second preset frequency are preset based on experimental data. The third preset speed ranges from the speeds corresponding to the silent mode, low fan speed, and medium fan speed; the fourth preset speed ranges from 15% to 55% of the rated maximum speed of the outdoor fan; and the first preset frequency ranges from 60Hz to 100Hz. Preferably, the third preset speed is the speed corresponding to the low fan speed, the fourth preset speed is 30% of the rated maximum speed of the outdoor fan, and the first preset frequency is 90Hz. In this embodiment, to accelerate defrosting, the indoor fan speed is simultaneously adjusted to the third preset speed, the outdoor fan speed is adjusted to the fourth preset speed, and the compressor operating frequency is adjusted to the second preset frequency.

[0051] In addition, the defrosting process of the second heat exchanger also includes controlling the defrosting time of the second heat exchanger to a second preset time. The second preset time is preset based on experimental data, and the value of the second preset time ranges from 10 seconds to 60 seconds. Preferably, the first preset time is 45 seconds.

[0052] After the first and second heat exchangers are defrosted one by one, step S4 is executed to control the opening degree of the first and second throttling devices to defrost the first and second heat exchangers simultaneously. After defrosting the first and second heat exchangers one by one, in order to prevent any residual frost from remaining on the first and second heat exchangers, the first and second heat exchangers are simultaneously defrosted to remove the frost.

[0053] In this embodiment, the step of controlling the opening degree of the first throttling device and the second throttling device to simultaneously defrost the first heat exchanger and the second heat exchanger includes: adjusting the opening degree of the first throttling device to its maximum opening degree, and adjusting the opening degree of the second throttling device to its maximum opening degree. Adjusting both the opening degree of the first throttling device and the opening degree of the second throttling device to their maximum opening degree increases the defrosting speed.

[0054] The step of simultaneously defrosting the first and second heat exchangers by controlling the opening degrees of the first and second throttling devices further includes: adjusting the indoor fan speed to a fifth preset speed; and / or adjusting the outdoor fan speed to a sixth preset speed; and / or adjusting the compressor operating frequency to a third preset frequency. The fifth preset speed, sixth preset speed, and third preset frequency are preset based on experimental data. The fifth preset speed ranges from the speeds corresponding to the silent, low, and medium fan speeds; the sixth preset speed ranges from 5% to 35% of the rated maximum speed of the outdoor fan; and the third preset frequency ranges from 90Hz to 110Hz. Preferably, the fifth preset speed is the speed corresponding to the silent mode, the sixth preset speed is 15% of the rated maximum speed of the outdoor fan, and the third preset frequency is 105Hz. In this embodiment, to accelerate the defrosting speed, the indoor fan speed is simultaneously adjusted to the fifth preset speed, the outdoor fan speed is adjusted to the sixth preset speed, and the compressor operating frequency is adjusted to the third preset frequency.

[0055] Furthermore, the step of controlling the opening degree of the first throttling device and the second throttling device to simultaneously defrost the first heat exchanger and the second heat exchanger also includes: controlling the duration of simultaneous defrosting of the first heat exchanger and the second heat exchanger to a third preset duration. The third preset duration is preset based on experimental data, and the value of the third preset duration ranges from 20 seconds to 60 seconds, preferably 40 seconds.

[0056] After the first and second heat exchangers have been defrosted simultaneously, step S5 is executed to exit the defrosting process. Once the simultaneous defrosting of the first and second heat exchangers is complete, the defrosting process is considered finished, and the system exits the defrosting step, operates according to the set heating mode, and enters the next defrosting cycle. In this embodiment, after exiting defrosting, a fourth preset time interval is required before proceeding to the next defrosting cycle. The fourth preset time interval ranges from 15 minutes to 45 minutes, preferably 30 minutes.

[0057] In an optional embodiment, after performing step S2, if the tube temperature of the first heat exchanger is lower than the preset temperature but the tube temperature of the second heat exchanger is not lower than the preset temperature, only the first heat exchanger is defrosted. If the tube temperature of the second heat exchanger is lower than the preset temperature but the tube temperature of the first heat exchanger is not lower than the preset temperature, only the second heat exchanger is defrosted. When one of the first and second heat exchangers needs defrosting, only the heat exchanger that needs defrosting can be defrosted, so that while one heat exchanger is defrosting, the other heat exchanger can operate normally, ensuring the indoor heating effect.

[0058] As can be seen from the above, the split defrosting control method of the present invention, after meeting the conditions for entering defrosting, defrosts the first heat exchanger and the second heat exchanger one by one, which can ensure that while one heat exchanger is defrosting, the other heat exchanger is still in the heating operation state, thereby achieving temperature maintenance while defrosting.

[0059] Air conditioner example:

[0060] The air conditioner in this embodiment includes a controller, which executes the steps in the above-described split-flow defrosting control method embodiment when executing a computer program.

[0061] For example, a computer program can be divided into one or more modules, one or more of which are stored in memory and executed by a controller to complete the present invention. One or more modules can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in an air conditioner.

[0062] An air conditioner may include, but is not limited to, a controller and a memory. Those skilled in the art will understand that an air conditioner may include more or fewer components, or a combination of certain components, or different components; for example, an air conditioner may also include input / output devices, network access devices, buses, etc.

[0063] For example, the controller can be a Central Processing Unit (CPU), or other general-purpose controllers, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose controller can be a microcontroller or any conventional controller. The controller is the control center of the air conditioner, connecting all parts of the air conditioner through various interfaces and lines.

[0064] The memory can be used to store computer programs and / or modules. The controller implements various functions of the air conditioner by running or executing the computer programs and / or modules stored in the memory, and by calling the data stored in the memory. For example, the memory may mainly include a program storage area and a data storage area, wherein the program storage area may store the operating system, at least one application program required for a function, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0065] Examples of computer-readable storage media:

[0066] If the modules integrated into the air conditioner in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-described flow-diverting defrosting control method embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by the controller, it can implement the steps of the above-described flow-diverting defrosting control method embodiments. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The storage medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content contained in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0067] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept also fall within the protection scope of the present invention.

Claims

1. A flow-dividing defrosting control method, applied to an air conditioner, wherein the outdoor unit of the air conditioner is provided with a first flow path and a second flow path connected in parallel, the first flow path including a first throttling device and a first heat exchanger connected in series, and the second flow path including a second throttling device and a second heat exchanger connected in series, characterized in that: The method includes: Enter heating mode; Determine whether the conditions for entering defrosting are met. If so, control the opening of the first throttling device and the opening of the second throttling device to defrost at least one of the first heat exchanger and the second heat exchanger. If both the first heat exchanger and the second heat exchanger need to be defrosted, defrost the first heat exchanger and the second heat exchanger one by one. When the first heat exchanger defrosts, the opening degree of the first throttling device is greater than that of the second throttling device, and when the second heat exchanger defrosts, the opening degree of the first throttling device is less than that of the second throttling device.

2. The de-flow defrosting control method according to claim 1, characterized in that: When the first heat exchanger defrosts, the opening of the first throttling device is adjusted to the maximum opening of the first throttling device, and the opening of the second throttling device is adjusted to the first preset opening, which is less than the maximum opening of the first throttling device.

3. The de-flow defrosting control method according to claim 2, characterized in that: During defrosting of the first heat exchanger, the process also includes: Adjust the indoor fan speed to the first preset speed; and / or Adjust the outdoor fan speed to the second preset speed; and / or Adjust the compressor's operating frequency to the first preset frequency.

4. The flow splitting defrosting control method according to claim 3, characterized in that: During defrosting of the first heat exchanger, the process also includes: The defrosting time of the first heat exchanger is controlled to be the first preset time.

5. The de-flow defrosting control method according to claim 1, characterized in that: When the second heat exchanger defrosts, the opening of the first throttling device is adjusted to the second preset opening, and the opening of the second throttling device is adjusted to the maximum opening of the second throttling device. The second preset opening is less than the maximum opening of the second throttling device.

6. The de-flow defrosting control method according to claim 5, characterized in that: During defrosting of the second heat exchanger, the process also includes: Adjust the indoor fan speed to the third preset speed; and / or Adjust the outdoor fan speed to the fourth preset speed; and / or Adjust the compressor's operating frequency to the second preset frequency.

7. The de-flow defrosting control method according to claim 5, characterized in that: During defrosting of the second heat exchanger, the process also includes: The defrosting time of the second heat exchanger is controlled to be the second preset time.

8. The de-flow defrosting control method according to any one of claims 1 to 7, characterized in that: The first heat exchanger is located above the second heat exchanger in the vertical direction; The step of defrosting the first heat exchanger and the second heat exchanger one by one by controlling the opening degree of the first throttling device and the second throttling device further includes: After the first heat exchanger has finished defrosting, the second heat exchanger is then defrosted.

9. The de-flow defrosting control method according to any one of claims 1 to 7, characterized in that: After the first heat exchanger and the second heat exchanger are defrosted one by one, the process also includes: The opening degree of the first throttling device and the opening degree of the second throttling device are controlled to defrost the first heat exchanger and the second heat exchanger simultaneously.

10. The de-flow defrosting control method according to claim 9, characterized in that: The steps of simultaneously defrosting the first heat exchanger and the second heat exchanger by controlling the opening degree of the first throttling device and the second throttling device include: Adjust the opening of the first throttling device to its maximum opening, and adjust the opening of the second throttling device to its maximum opening.

11. The flow splitting defrosting control method according to claim 10, characterized in that: The step of simultaneously defrosting the first heat exchanger and the second heat exchanger by controlling the opening degree of the first throttling device and the second throttling device further includes: Adjust the indoor fan speed to the fifth preset speed; and / or Adjust the outdoor fan speed to the sixth preset speed; and / or Adjust the compressor's operating frequency to the third preset frequency.

12. The flow splitting defrosting control method according to claim 11, characterized in that: The step of simultaneously defrosting the first heat exchanger and the second heat exchanger by controlling the opening degree of the first throttling device and the second throttling device further includes: The duration for which the first heat exchanger and the second heat exchanger defrost simultaneously is controlled to be a third preset duration.

13. The de-flow defrosting control method according to any one of claims 1 to 7, characterized in that: The conditions for entering defrost include: the tube temperature of the first heat exchanger and / or the second heat exchanger is lower than the preset temperature; If the tube temperature of the first heat exchanger is lower than the preset temperature but the tube temperature of the second heat exchanger is not lower than the preset temperature, only the first heat exchanger will be defrosted. If the tube temperature of the second heat exchanger is lower than the preset temperature but the tube temperature of the first heat exchanger is not lower than the preset temperature, only the second heat exchanger will be defrosted. If the tube temperatures of both the first heat exchanger and the second heat exchanger are lower than the preset temperature, defrost the first heat exchanger and the second heat exchanger one by one.

14. The de-flow defrosting control method according to claim 13, characterized in that: After confirming that the tube temperatures of both the first and second heat exchangers are lower than the preset temperature, before defrosting each of the first and second heat exchangers, it is also confirmed that the heating operation has reached the preset duration.

15. An air conditioner, comprising a processor and a memory, characterized in that: The memory stores a computer program that, when executed by the processor, implements the steps of the shunt defrosting control method as described in any one of claims 1 to 14.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the controller, it implements the steps of the shunt defrosting control method as described in any one of claims 1 to 14.

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