A defrosting control method, air conditioner and defrosting control module

Abstract

This application provides a defrosting control method, an air conditioner, and a defrosting control module. The defrosting control method includes obtaining the frost thickness on the outdoor heat exchanger; when the frost thickness exceeds a preset thickness, controlling the compressor to supply refrigerant to the indoor heat exchanger through a first branch and controlling the compressor to output refrigerant through a second branch, so that the refrigerant after heat exchange in the indoor heat exchanger merges with the refrigerant output from the second branch, and the merged refrigerant is supplied to the outdoor heat exchanger to melt the frost on the outdoor heat exchanger. The defrosting control method provided by this application achieves a defrosting effect on the outdoor heat exchanger in heating mode, thereby avoiding blowing cold air into the room due to defrosting needs and improving the user experience. At the same time, it improves the utilization efficiency of the compressor's waste heat and achieves defrosting of the outdoor heat exchanger without consuming additional energy, saving energy and costs.

Description

Technical Field

[0001] This application belongs to the field of air conditioning technology, and in particular relates to a defrosting control method, an air conditioner, and a defrosting control module. Background Technology

[0002] In winter, when an air conditioner is turned on in heating mode in a low-temperature environment, the outdoor heat exchanger is in a low-temperature and high-humidity environment, which makes the surface of the outdoor heat exchanger prone to frost formation.

[0003] The defrosting operation of existing air conditioners usually involves switching the air conditioner from heating mode to cooling mode, and then introducing high-temperature gas into the outdoor heat exchanger through the compressor, which melts the frost on the surface of the outdoor heat exchanger and achieves the defrosting effect.

[0004] However, this defrosting method blows cold air into the room, lowering the indoor temperature and resulting in a poor user experience. Summary of the Invention

[0005] This application provides a defrosting control method, an air conditioner, and a defrosting control module to solve the problem that existing air conditioners lower the indoor temperature and result in a poor user experience when defrosting by turning on the cooling mode.

[0006] This application provides a defrosting control method applied to an air conditioner, the air conditioner including a compressor, an outdoor heat exchanger, and an indoor heat exchanger, the method including:

[0007] Obtain the frost thickness on the outdoor heat exchanger;

[0008] When the frost thickness exceeds a preset thickness, the compressor is controlled to supply refrigerant to the indoor heat exchanger through the first branch and to output refrigerant through the second branch, so that the refrigerant after heat exchange in the indoor heat exchanger and the refrigerant output from the second branch are combined. The combined refrigerant is then sent to the outdoor heat exchanger to melt the frost on the outdoor heat exchanger.

[0009] Optionally, the method further includes controlling the situation after the frost thickness exceeds a preset thickness:

[0010] Obtain the pressure difference between the output terminal of the compressor and the output terminal of the indoor heat exchanger;

[0011] If the pressure difference is less than the preset pressure difference, the flow rate at the output end of the indoor heat exchanger is reduced until the pressure difference is greater than or equal to the preset pressure difference.

[0012] Optionally, before the refrigerant after heat exchange in the indoor heat exchanger merges with the refrigerant output from the second branch, the method further includes:

[0013] The refrigerant flow rate on the second branch is determined based on the frost thickness.

[0014] Optionally, controlling the acquisition of frost thickness on the outdoor heat exchanger includes:

[0015] Infrared rays are emitted towards the outdoor heat exchanger, and the transmittance of the infrared rays is obtained;

[0016] The thickness of frost on the outdoor heat exchanger is determined based on the penetration rate.

[0017] Optionally, after controlling the flow of the combined refrigerant to the outdoor heat exchanger, the method further includes:

[0018] The refrigerant at the outdoor heat exchanger is throttled and its pressure reduced.

[0019] The refrigerant after pressure reduction is introduced into the outdoor heat exchanger for heat exchange.

[0020] This application also provides an air conditioner applicable to the above-described defrosting control method, the air conditioner comprising:

[0021] The compressor, the output of which is connected to the first branch and the second branch respectively;

[0022] An indoor heat exchanger, wherein the input end of the indoor heat exchanger is connected to the first branch;

[0023] Outdoor heat exchanger;

[0024] The first connecting pipe has one end connected to the second branch and the output end of the indoor heat exchanger, and the other end is at least partially adjacent to the outdoor heat exchanger.

[0025] Optionally, the first connecting pipe is provided with a first throttling element at one end near the indoor heat exchanger, and the first throttling element is used to reduce the pressure at the output end of the indoor heat exchanger.

[0026] Optionally, the second branch is further provided with a second throttling device, which is used to adjust the flow rate of refrigerant on the second branch according to the frost thickness on the outdoor heat exchanger.

[0027] Optionally, a one-way valve is also provided on the second branch, which is used to control the flow of refrigerant in the second branch from the compressor to the first connecting pipe.

[0028] This application embodiment also provides a defrosting control module for controlling the defrosting of an air conditioner, the air conditioner including a compressor, an outdoor heat exchanger, and an indoor heat exchanger, the defrosting control module including:

[0029] The acquisition module is used to acquire the frost thickness on the outdoor heat exchanger;

[0030] The control module is used to control the compressor to supply refrigerant to the indoor heat exchanger through the first branch and to control the compressor to output refrigerant through the second branch when the frost thickness exceeds the preset thickness, so that the refrigerant after heat exchange in the indoor heat exchanger and the refrigerant output from the second branch are combined, and the combined refrigerant is sent to the outdoor heat exchanger to melt the frost on the outdoor heat exchanger.

[0031] The defrosting control method provided in this application allows for defrosting of the outdoor heat exchanger when it requires defrosting. In heating mode, the air conditioner outputs high-temperature refrigerant to the second branch via the compressor. This high-temperature refrigerant mixes with the refrigerant output from the indoor heat exchanger, resulting in a higher-temperature refrigerant that heats the outdoor heat exchanger. This achieves defrosting of the outdoor heat exchanger even in heating mode, preventing cold air from blowing into the room during defrosting and improving the user experience. Simultaneously, it improves the utilization efficiency of the compressor's waste heat and achieves defrosting of the outdoor heat exchanger without consuming additional energy, saving energy and costs. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0034] Figure 1 This is a schematic diagram of a scenario for the defrosting control method provided in an embodiment of this application.

[0035] Figure 2 This is a schematic flowchart of the defrosting control method provided in an embodiment of this application.

[0036] Figure 3 A schematic diagram showing the connection of the compressor, indoor heat exchanger, and outdoor heat exchanger of an air conditioner provided in an embodiment of this application.

[0037] Figure 4 This is a schematic diagram showing the connection between the indoor and outdoor units of an air conditioner provided in an embodiment of this application.

[0038] Figure 5 This is a schematic diagram of the detector and outdoor heat exchanger of the air conditioner provided in an embodiment of this application.

[0039] Figure 6 This is a schematic diagram of the defrosting control module provided in an embodiment of this application. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] In the description of the embodiments of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, and memory, and may also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, a microprocessor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc.

[0042] This application provides a defrosting control method and an air conditioner to solve the problem that existing air conditioners lower the indoor temperature and result in a poor user experience when defrosting by turning on the cooling mode. The following description is in conjunction with the accompanying drawings.

[0043] The defrosting control method provided in this application embodiment is applied to an air conditioner 1, which includes a compressor 11, an outdoor heat exchanger 13, and an indoor heat exchanger 12. Please refer to [link to relevant documentation]. Figure 1 and Figure 2 , Figure 1 This is a schematic diagram illustrating a scenario for the defrosting control method provided in an embodiment of this application. Figure 2 This is a flowchart illustrating the defrosting control method provided in an embodiment of this application. The method includes the following steps:

[0044] Step S101: Obtain the frost thickness on the outdoor heat exchanger 13;

[0045] Step S102: When the frost thickness exceeds the preset thickness, control the compressor 11 to introduce refrigerant into the indoor heat exchanger 12 through the first branch and control the compressor 11 to output refrigerant through the second branch, so that the refrigerant after heat exchange in the indoor heat exchanger 12 and the refrigerant output from the second branch are combined. The combined refrigerant is then sent to the outdoor heat exchanger 13 to melt the frost on the outdoor heat exchanger 13.

[0046] The defrosting control method provided in this application embodiment allows for defrosting of the outdoor heat exchanger 13 when the air conditioner 1 is in heating mode. The compressor 11 outputs high-temperature refrigerant to the second branch, mixing it with the refrigerant output from the indoor heat exchanger 12. This results in a higher-temperature refrigerant that heats the outdoor heat exchanger 13, achieving defrosting while in heating mode. This avoids blowing cold air into the room due to defrosting requirements, improving the user experience. Simultaneously, it improves the utilization efficiency of the compressor 11's waste heat and achieves defrosting of the outdoor heat exchanger 13 without consuming additional energy, saving energy and costs. Furthermore, this defrosting method can be performed simultaneously with the air conditioner 1's heating function, enabling continuous defrosting while heating. This avoids situations where defrosting is only performed for a short time, causing the condensate formed during defrosting to freeze on the outdoor heat exchanger 13 before it is fully drained. This defrosting method allows sufficient time for condensate drainage without affecting the indoor temperature, preventing the condensate from refreezing before it is drained.

[0047] The specific heating location of the outdoor heat exchanger 13 after the refrigerant is combined is not further defined here. The outdoor heat exchanger 13 typically includes a U-shaped coil and a water receiving pan located at the bottom of the U-shaped coil. In some examples, the combined refrigerant can heat the outdoor heat exchanger 13 at the bottom of the water receiving pan, while in other examples, the combined refrigerant can heat the outdoor heat exchanger 13 around the periphery of the U-shaped coil.

[0048] Optionally, in step S102, after controlling the frost thickness to exceed a preset thickness, the method further includes:

[0049] Step S1021: Obtain the pressure difference between the output terminal of compressor 11 and the output terminal of indoor heat exchanger 12;

[0050] Step S1022: If the pressure difference is less than the preset pressure difference, the flow rate at the output end of the indoor heat exchanger 12 is reduced until the pressure difference is greater than or equal to the preset pressure difference.

[0051] It should be noted that, due to heat loss during heat exchange in the indoor heat exchanger 12, the pressure at the output end of the indoor heat exchanger 12 is usually lower than the pressure at the output end of the compressor 11. However, in some examples, because the heat loss during heat exchange in the indoor heat exchanger 12 is low, the pressure at the output end of the indoor heat exchanger 12 is only slightly lower than the pressure at the output end of the compressor 11, resulting in a small pressure difference between the output ends of the compressor 11 and the indoor heat exchanger 12. In this case, by performing the operation of reducing the flow rate at the output end of the indoor heat exchanger 12 in step S1022 above, the pressure difference between the output ends of the compressor 11 and the indoor heat exchanger 12 is made to be greater than or equal to the preset pressure difference, so that the output end of the compressor 11 can smoothly output refrigerant to the second branch, so that the refrigerant in the second branch can merge with the refrigerant after heat exchange output by the indoor heat exchanger 12.

[0052] It is understandable that the refrigerant output by the compressor 11 to the first and second branches is a high-temperature and high-pressure gaseous refrigerant. After heat exchange by the indoor heat exchanger 12, the high-temperature and high-pressure gaseous refrigerant becomes a low-temperature and low-pressure liquid refrigerant. Therefore, after the high-temperature and high-pressure gaseous refrigerant mixes with the low-temperature and low-pressure liquid refrigerant, the temperature of the refrigerant leading to the outdoor heat exchanger 13 is increased, thereby melting the frost on the outdoor heat exchanger 13.

[0053] Optionally, before executing step S102, which controls the refrigerant after heat exchange in the indoor heat exchanger 12 to merge with the refrigerant output from the second branch, the method further includes:

[0054] Step S1023: Determine the refrigerant flow rate on the second branch based on the frost thickness.

[0055] When the frost is thick, the refrigerant flow rate on the second branch is increased to melt the frost on the outdoor heat exchanger 13 more quickly. When the frost is thin, the refrigerant flow rate on the second branch is decreased to melt the frost on the outdoor heat exchanger 13 while minimizing the impact on the refrigerant flow rate output by the compressor 11 to the indoor heat exchanger 12, thus avoiding affecting the indoor temperature and improving the user experience.

[0056] Optionally, step S101 is performed to obtain the frost thickness on the outdoor heat exchanger 13, including:

[0057] Step S1011: Emit infrared rays to the outdoor heat exchanger 13 and obtain the transmittance of the infrared rays;

[0058] Step S1012: Determine the frost thickness on the outdoor heat exchanger 13 based on the penetration rate.

[0059] This involves emitting infrared light into the outdoor heat exchanger 13 from one end and detecting the infrared light at the other end to obtain the transmittance of the infrared light through the outdoor heat exchanger 13. Areas with higher transmittance indicate less or no frost, while areas with lower transmittance indicate thicker frost. Once the frost condition of the outdoor heat exchanger 13 is known, the flow rate of the refrigerant in the second branch can be determined based on the frost thickness, thereby melting the frost on the outdoor heat exchanger 13 while minimizing its impact on the indoor temperature.

[0060] As an alternative implementation, when detecting the infrared transmittance of the outdoor heat exchanger 13, infrared light can be emitted from one end of the outdoor heat exchanger 13 and detected on that side. The detected infrared light is then reflected back by the outdoor heat exchanger 13. In this case, a higher detected infrared intensity indicates thicker frost, while a lower detected infrared intensity indicates less frost or no frost. Of course, the infrared light used here can be adaptively replaced with other rays with penetrating properties.

[0061] Optionally, before performing step S1011, the method further includes:

[0062] Step S1010: Control detector 19 to scan outdoor heat exchanger 13 and determine the area to be measured.

[0063] Please see Figure 5 , Figure 5 The present invention provides a schematic diagram of the detector 19 of the air conditioner and the outdoor heat exchanger. When the detector 19 starts measuring the frost thickness on the outdoor heat exchanger 13, the shape of the outdoor heat exchanger 13 is first determined by a 360° circumferential scan. Based on the shape of the outdoor heat exchanger 13, the area to be measured of the outdoor heat exchanger 13 is further determined. Here, the outdoor heat exchanger 13 includes, but is not limited to, V-shaped, L-shaped and U-shaped types.

[0064] Optionally, after executing step S102, which controls the flow of the combined refrigerant to the outdoor heat exchanger 13, the method further includes:

[0065] Step S1024: Control the refrigerant at outdoor heat exchanger 13 to throttle and reduce pressure;

[0066] Step S1025: Control the depressurized refrigerant to be introduced into the outdoor heat exchanger 13 for heat exchange.

[0067] That is, after the refrigerant heats and defrosts the frost on the outdoor heat exchanger 13, it then throttles and exchanges heat to continue the heating cycle of the air conditioner 1.

[0068] Optionally, after executing step S1025 to control the depressurized refrigerant to be introduced into the outdoor heat exchanger 13 for heat exchange, the method further includes:

[0069] Step S1026: Control the refrigerant after heat exchange with the outdoor heat exchanger 13 to enter the compressor 11.

[0070] The refrigerant is output from the compressor 11 and passes through the indoor heat exchanger 12 and the outdoor heat exchanger 13 in sequence before entering the compressor 11 again, thus completing one refrigerant cycle. By repeating the above process, the heating effect on the indoor unit and the defrosting effect on the outdoor heat exchanger 13 are achieved.

[0071] Optionally, after executing step S102 to control the compressor 11 to output refrigerant through the second branch, the method further includes step S1027: when the frost thickness is lower than a set threshold, controlling the second branch to shut down. The preset threshold is not further limited here; its value can be small or zero.

[0072] Optionally, after executing step S102 to control the compressor 11 to output refrigerant through the second branch, the method further includes step S1028: controlling the second branch to close after a first preset time.

[0073] Even if the frost thickness still exceeds the preset thickness after the first preset time, the output of high-temperature refrigerant to the second branch through compressor 11 will be stopped to prevent the second branch from being open for an extended period and affecting the indoor heating effect. At this time, by temporarily shutting down the second branch, indoor comfort is ensured. At the same time, the flow rate at the output end of the indoor heat exchanger 12 can be increased, and the refrigerant output from the indoor heat exchanger 12 can heat the outdoor heat exchanger 13, maintaining a certain degree of defrosting effect. Furthermore, after the second preset time, the second branch can be reopened to output refrigerant to accelerate the defrosting speed.

[0074] This application also provides an air conditioner 1, which is applicable to the above-described defrosting control method. Please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a connection diagram of the compressor 11, indoor heat exchanger 12, and outdoor heat exchanger 13 of an air conditioner 1 provided in this application embodiment. The air conditioner 1 includes a compressor 11, an indoor heat exchanger 12, an outdoor heat exchanger 13, and a first connecting pipe. The output end of the compressor 11 is connected to a first branch and a second branch, respectively; the input end of the indoor heat exchanger 12 is connected to the first branch; one end of the first connecting pipe is connected to the second branch and the output end of the indoor heat exchanger 12, and the other end is at least partially adjacent to the outdoor heat exchanger 13. The indoor heat exchanger 12 is disposed in the indoor unit, and the outdoor heat exchanger 13 is disposed in the outdoor unit. Please refer to the connection diagram of the indoor and outdoor units. Figure 4 .

[0075] Since the other end of the first connecting pipe is at least partially connected to the outdoor heat exchanger 13, the outdoor heat exchanger 13 can be defrosted by the heat radiated by the high-temperature refrigerant in the first connecting pipe.

[0076] Optionally, a first throttling element 14 is provided at the end of the first connecting pipe near the indoor heat exchanger 12. The first throttling element 14 is used to reduce the pressure at the output end of the indoor heat exchanger 12. In some examples, the first throttling element 14 can be an electronic expansion valve, a ball valve, etc. Specifically, the pressure at the output end of the indoor heat exchanger 12 can be adjusted by regulating the opening degree of the electronic expansion valve or the ball valve.

[0077] Optionally, a second throttling element 15 is also provided on the second branch. The second throttling element 15 is used to adjust the flow rate of the refrigerant on the second branch according to the frost thickness on the outdoor heat exchanger 13. In some examples, the second throttling element 15 can be an electronic expansion valve, a ball valve, etc. Specifically, the pressure at the output end of the indoor heat exchanger 12 can be adjusted by adjusting the opening degree of the electronic expansion valve or the ball valve.

[0078] Optionally, a one-way valve 17 is also provided on the second branch, which is used to control the flow of refrigerant from the compressor 11 to the first connecting pipe in the second branch.

[0079] Optionally, a third throttling element 16 is also provided at the end of the first connecting pipe near the outdoor heat exchanger 13. The third throttling element 16 is used to throttle and reduce the pressure of the refrigerant flowing through it. In some examples, the second throttling element 15 can be an electronic expansion valve, a ball valve, etc. Specifically, the pressure at the output end of the indoor heat exchanger 12 can be adjusted by adjusting the opening degree of the electronic expansion valve or the ball valve.

[0080] The refrigerant in the first connecting pipe first flows through the periphery of the outdoor heat exchanger 13 to heat the outer periphery of the outdoor heat exchanger 13, and then enters the third throttling element 16 for throttling, and then enters the outdoor heat exchanger 13 for heat exchange.

[0081] Optionally, the outdoor heat exchanger 13 can be connected to the compressor 11 through the second connecting pipe. Furthermore, the second connecting pipe and the first branch can be connected through the four-way valve 18. By adjusting the four-way valve 18, the flow direction of the refrigerant can be adjusted to achieve cooling or heating of the air conditioner 1. Correspondingly, in cooling mode and heating mode, the input and output ends of the indoor heat exchanger 12 and the outdoor heat exchanger 13 are reversed.

[0082] This application embodiment also provides a defrosting control module 3, please refer to... Figure 6 , Figure 6This is a schematic diagram of the defrosting control module 3 provided in this embodiment of the application. It is used to control the defrosting of the air conditioner 1. The air conditioner 1 includes a compressor 11, an outdoor heat exchanger 13, and an indoor heat exchanger 12. The defrosting control module 3 includes an acquisition module 2 and a control module 3. The acquisition module 2 is used to acquire the frost thickness on the outdoor heat exchanger 13. The control module 3 is used to control the compressor 11 to introduce refrigerant into the indoor heat exchanger 12 through a first branch and to control the compressor 11 to output refrigerant through a second branch when the frost thickness exceeds a preset thickness. This allows the refrigerant after heat exchange in the indoor heat exchanger 12 to merge with the refrigerant output from the second branch. The merged refrigerant is then directed to the outdoor heat exchanger 13 to melt the frost on the outdoor heat exchanger 13.

[0083] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the defrosting control method described above.

[0084] This application embodiment also provides a storage medium storing control instructions, which, when executed by a processor, implement the defrosting control method as described above.

[0085] For example, a computer program can be divided into one or more modules / units, which are stored in memory and executed by a processor to perform the present invention. The one or more modules / units 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 electronic device.

[0086] Electronic devices can be desktop computers, laptops, handheld computers, and cloud servers, among other electronic devices. Electronic devices may include, but are not limited to, processors and memory. For example, electronic devices may also include input / output devices, network access devices, buses, etc.

[0087] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, 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 processor can be a microprocessor or any conventional processor.

[0088] In the embodiments provided by this invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. Multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0089] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, the functional units in the various embodiments of this 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 units described above can be implemented in hardware or as software functional units.

[0090] If integrated modules / units 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 methods of the above embodiments of the present invention 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 a processor, it can implement the steps of the various method embodiments described above. The computer program may include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable media may 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 included in a computer-readable medium may be appropriately added to or subtracted according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media may not include electrical carrier signals and telecommunication signals.

[0091] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0092] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0093] The defrosting control method, air conditioner, and defrosting control module provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A defrosting control method applied to an air conditioner, the air conditioner comprising a compressor, an outdoor heat exchanger, and an indoor heat exchanger, the method comprising: determining a defrosting start condition; determining a defrosting end condition; and determining a defrosting control method based on a result of the determination of the defrosting start condition and the defrosting end condition. The method comprises: acquiring the frost thickness on the outdoor heat exchanger; when the frost thickness exceeds a preset thickness, controlling the compressor to pass the refrigerant to the indoor heat exchanger through the first branch and controlling the compressor to output the refrigerant through the second branch, so that the refrigerant after heat exchange through the indoor heat exchanger and the refrigerant output through the second branch are merged, and the merged refrigerant is passed to the outdoor heat exchanger for melting the frost on the outdoor heat exchanger; after the frost thickness exceeds the preset thickness, the method further comprises: acquiring the pressure difference between the output end of the compressor and the output end of the indoor heat exchanger; if the pressure difference is less than a preset pressure difference, then controlling the flow of the output end of the indoor heat exchanger to decrease until the pressure difference is greater than or equal to the preset pressure difference.

2. The defrosting control method according to claim 1, characterized by, Before the refrigerant after heat exchange through the indoor heat exchanger and the refrigerant output through the second branch are merged, the method further comprises: determining the flow of the refrigerant on the second branch according to the frost thickness.

3. The defrosting control method according to claim 1, characterized by, The control of acquiring the frost thickness on the outdoor heat exchanger comprises: emitting infrared rays to the outdoor heat exchanger and acquiring the penetration rate of the infrared rays; determining the frost thickness on the outdoor heat exchanger according to the penetration rate.

4. The defrosting control method according to claim 1, characterized by, After the merged refrigerant is passed to the outdoor heat exchanger, the method further comprises: controlling the refrigerant at the outdoor heat exchanger to throttle and reduce pressure; controlling the refrigerant after pressure reduction to pass to the outdoor heat exchanger for heat exchange.

5. An air conditioner adapted to the defrosting control method according to any one of claims 1 to 4, characterized in that, The air conditioner comprises: a compressor, the output end of the compressor being connected to the first branch and the second branch respectively; an indoor heat exchanger, the input end of the indoor heat exchanger being communicated with the first branch; an outdoor heat exchanger; a first communication pipe, one end of the first communication pipe being communicated with the second branch and the output end of the indoor heat exchanger, and the other end of the first communication pipe being at least partially adjacent to the outdoor heat exchanger.

6. The air conditioner of claim 5, wherein The first communication pipe is provided with a first throttling member at the end close to the indoor heat exchanger, and the first throttling member is used to reduce the pressure of the output end of the indoor heat exchanger.

7. The air conditioner of claim 5, wherein The second branch is further provided with a second throttling member, and the second throttling member is used to adjust the flow of the refrigerant on the second branch according to the frost thickness on the outdoor heat exchanger.

8. The air conditioner of claim 5, wherein The second branch is further provided with a one-way valve, and the one-way valve is used to control the refrigerant in the second branch to flow from the compressor to the first communication pipe.

9. A defrosting control module for controlling the defrosting of an air conditioner, the air conditioner comprising a compressor, an outdoor heat exchanger, and an indoor heat exchanger, characterized in that, The defrosting control module comprises: an acquiring module, used to acquire the frost thickness on the outdoor heat exchanger; a control module, used to, when the frost thickness exceeds a preset thickness, control the compressor to pass the refrigerant to the indoor heat exchanger through the first branch and control the compressor to output the refrigerant through the second branch, so that the refrigerant after heat exchange through the indoor heat exchanger and the refrigerant output through the second branch are merged, and the merged refrigerant is passed to the outdoor heat exchanger for melting the frost on the outdoor heat exchanger; after the frost thickness exceeds the preset thickness, the defrosting control module further comprises: acquiring the pressure difference between the output end of the compressor and the output end of the indoor heat exchanger; if the pressure difference is less than a preset pressure difference, then controlling the flow of the output end of the indoor heat exchanger to decrease until the pressure difference is greater than or equal to the preset pressure difference.

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