Outdoor unit of air conditioner, air conditioner and control method and control device of air conditioner

Abstract

The invention relates to the field of electric appliances, and provides an outdoor unit of an air conditioner, the air conditioner and a control method and device thereof. The outdoor unit comprises a first outdoor heat exchanger and a second outdoor heat exchanger; the exhaust port communicates with an inlet of the indoor unit through the control valve assembly, an outlet of the indoor unit communicates with the throttling main valve, and the throttling main valve selectively communicates with a first port of the first outdoor heat exchanger and a first port of the second outdoor heat exchanger. A second port of the first outdoor heat exchanger is selectively connected with the control valve assembly and a first port of the second outdoor heat exchanger. A second port of the second outdoor heat exchanger is selectively connected with the control valve assembly and a first port of the first outdoor heat exchanger, and the control valve assembly switches the circulation state of the control valve assembly according to the air conditioner defrosting mode. A traditional single outdoor heat exchanger is decomposed into two independent heat exchange units, dynamic reconstruction of a refrigerant flow path is achieved through a valve set structure, and therefore the continuous heating capacity of the system is maintained in the defrosting process.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to an outdoor unit of an air conditioner, an air conditioner, and a control method and control device thereof. Background Technology

[0002] In existing technologies, in conventional room air conditioners or heat pump systems, when the equipment operates in a low-temperature, high-humidity environment during winter, frost inevitably forms on the surface of the outdoor heat exchanger because the refrigerant evaporation temperature is lower than the ambient air dew point temperature. As frost accumulates, heat exchange efficiency decreases significantly, and heating capacity diminishes. Therefore, defrosting operations must be performed periodically to restore heat exchange performance.

[0003] The most widely used defrosting method currently is reverse cycle defrosting. Its basic principle is: by switching a four-way valve, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor directly enters the outdoor heat exchanger for defrosting by releasing heat, while the indoor heat exchanger temporarily functions as an evaporator, absorbing indoor heat to complete the refrigerant evaporation process. Although this method is simple in structure and reliable in defrosting, it has a fundamental drawback: during defrosting, the system must absorb heat from the indoor side, and indoor heating is completely interrupted.

[0004] Specifically, during reverse-cycle defrosting, even when the indoor fan is turned off, the refrigerant inside the indoor heat exchanger continues to absorb heat through heat conduction because its temperature is much lower than the room temperature, causing a significant drop in indoor ambient temperature. Simultaneously, the repeated starting and stopping of heating causes drastic fluctuations in indoor temperature, severely impacting user thermal comfort. Furthermore, the lack of effective heating output during defrosting reduces the overall energy efficiency of the system, a problem that is particularly pronounced under severe weather conditions with frequent frosting. Summary of the Invention

[0005] This invention provides an outdoor unit of an air conditioner, an air conditioner, and a control method and device thereof, in order to overcome the defects existing in the prior art and achieve the following effects: the traditional single outdoor heat exchanger is decomposed into two heat exchange units with independently switchable functions, and the refrigerant flow path is dynamically reconfigured through structures such as control valve assemblies and throttling main valves, thereby maintaining the continuous heating capacity of the system during the defrosting process.

[0006] In a first aspect, the present invention provides an outdoor unit of an air conditioner, comprising: a compressor, a control valve assembly, a first outdoor heat exchanger, a second outdoor heat exchanger, and a throttling main valve; The compressor's exhaust port is connected to the inlet of the air conditioner's indoor unit via the control valve assembly, and the air conditioner's indoor unit's outlet is connected to the inlet of the throttling main valve. The outlet of the throttling main valve is selectively connected to the first port of the first outdoor heat exchanger and the first port of the second outdoor heat exchanger, respectively. The second port of the first outdoor heat exchanger is selectively connected to the control valve assembly and the first port of the second outdoor heat exchanger, respectively; the second port of the second outdoor heat exchanger is selectively connected to the control valve assembly and the first port of the first outdoor heat exchanger, respectively. The control valve assembly is connected to the air intake of the compressor, the air exhaust, the inlet of the indoor unit, the second port of the first outdoor heat exchanger, and the second port of the second outdoor heat exchanger. The control valve assembly switches its flow state according to the different defrosting modes of the air conditioner.

[0007] According to some embodiments of the present invention, the outdoor unit of the air conditioner further includes: The first three-way valve has its second port connected to the inlet of the first three-way valve, and its two outlets are respectively connected to the control valve assembly and the first port of the second outdoor heat exchanger. The second three-way valve is connected to the inlet of the second outdoor heat exchanger at the second port, and the two outlets of the second three-way valve are respectively connected to the control valve assembly and the first port of the first outdoor heat exchanger.

[0008] According to some embodiments of the present invention, the control valve assembly includes a first four-way valve, a second four-way valve, and a third four-way valve; In this configuration, one port of the first four-way valve is closed to form a refrigerant cutoff end, and the other three ports are respectively connected to the air intake, the exhaust port, and the first three-way valve; one port of the second four-way valve is closed to form a refrigerant cutoff end, and the other three ports are respectively connected to the air intake, the exhaust port, and the second three-way valve; one port of the third four-way valve is closed to form a refrigerant cutoff end, and the other three ports are respectively connected to the air intake, the exhaust port, and the inlet of the indoor unit.

[0009] According to some embodiments of the present invention, the defrosting mode of the air conditioner includes at least one of a first subcooling defrosting mode, a second subcooling defrosting mode, a first exhaust defrosting mode, and a second exhaust defrosting mode; In the first subcooled defrosting mode, the throttling main valve is only connected to the first port of the first outdoor heat exchanger, and the second port of the first outdoor heat exchanger is connected to the air intake through the first three-way valve and the first four-way valve in sequence; the second port of the second outdoor heat exchanger is connected to the first port of the first outdoor heat exchanger through the second three-way valve. In the second subcooling defrost mode, the throttling main valve is only connected to the first port of the second outdoor heat exchanger, and the second port of the second outdoor heat exchanger is connected to the air intake in sequence through the second three-way valve and the second four-way valve; the second port of the first outdoor heat exchanger is connected to the first port of the second outdoor heat exchanger through the first three-way valve. In the first exhaust defrosting mode, the exhaust port is connected to the intake port in sequence through the first four-way valve, the first three-way valve, the first outdoor heat exchanger, the second outdoor heat exchanger, the second three-way valve, and the second four-way valve; and the exhaust port is connected to the intake port in sequence through the third four-way valve, the indoor unit, the throttling main valve, the second outdoor heat exchanger, the second three-way valve, and the second four-way valve. In the second exhaust defrosting mode, the exhaust port is connected to the air intake port in sequence through the second four-way valve, the second three-way valve, the second outdoor heat exchanger, the first outdoor heat exchanger, the first three-way valve, and the first four-way valve. In addition, the exhaust port is connected to the air intake port in sequence through the third four-way valve, the indoor unit, the throttling main valve, the first outdoor heat exchanger, the first three-way valve, and the first four-way valve.

[0010] According to some embodiments of the present invention, a first throttling valve is provided between the outlet of the main throttling valve and the first port of the first outdoor heat exchanger, and a second throttling valve is provided between the outlet of the main throttling valve and the first port of the second outdoor heat exchanger. And / or, a third throttle valve is provided between the first three-way valve and the first port of the first outdoor heat exchanger, and a fourth throttle valve is provided between the second three-way valve and the first port of the second outdoor heat exchanger.

[0011] According to some embodiments of the present invention, the outdoor unit of the air conditioner further includes a subcooling heat exchanger disposed between the inlet of the throttling main valve and the outlet of the indoor unit.

[0012] Secondly, the present invention also protects an air conditioner, characterized in that it includes an outdoor unit of the air conditioner as described in the first aspect of the present invention, and also includes an indoor unit; the exhaust port of the compressor is connected to the inlet of the indoor unit of the air conditioner through the control valve assembly, and the outlet of the indoor unit of the air conditioner is connected to the inlet of the throttling main valve.

[0013] Thirdly, the present invention also protects a control method for an air conditioner, wherein the air conditioner includes an outdoor unit as described in the first aspect of the present invention, or the air conditioner is as described in the second aspect of the present invention, and the control method includes: Obtain the frosting status of the outdoor unit of the air conditioner; The defrosting mode of the air conditioner is determined based on the frosting condition of the outdoor unit. The flow state of the control valve assembly and the throttling main valve is controlled to control the air conditioner to enter the corresponding defrosting mode.

[0014] According to some embodiments of the present invention, the step of determining the defrosting mode of the air conditioner based on the frosting condition of the outdoor unit includes: If the first outdoor heat exchanger is frosted and the degree of frosting is less than or equal to the first set degree of frosting, the air conditioner is determined to operate in the first subcooling defrosting mode. If the first outdoor heat exchanger is frosted and the degree of frosting is greater than or equal to the second set degree of frosting, the air conditioner is determined to operate in the first exhaust defrosting mode. If the second outdoor heat exchanger is frosted and the degree of frosting is less than or equal to the first set degree of frosting, the air conditioner is determined to operate in the second subcooling defrosting mode. If the second outdoor heat exchanger is frosted and the degree of frosting is greater than or equal to the second set degree of frosting, the air conditioner is determined to operate in the second exhaust defrosting mode. Wherein, the first set frosting degree is less than or equal to the second set frosting degree.

[0015] According to some embodiments of the present invention, the step of controlling and adjusting the flow state of the control valve assembly and the throttling master valve to control the air conditioner to enter the corresponding defrost mode specifically includes: The main throttling valve and the first throttling valve are fully open, the third throttling valve is throttled, and the second and fourth throttling valves are closed. The second port of the first outdoor heat exchanger is connected to the air intake through the first three-way valve and the first four-way valve in sequence to control the air conditioner to enter the first subcooling defrost mode. The main throttling valve and the second throttling valve are fully open, the fourth throttling valve is in a throttling state, and the first throttling valve and the third throttling valve are both closed. The second port of the second outdoor heat exchanger is connected to the air intake through the second three-way valve and the second four-way valve in sequence to control the air conditioner to enter the second subcooling defrost mode. The second throttle valve is controlled to be fully open, the main throttle valve and the first throttle valve are in a throttle state, and the third throttle valve and the fourth throttle valve are both in a closed state. The second port of the second outdoor heat exchanger is controlled to be connected to the air intake through the second three-way valve and the second four-way valve in sequence, and the second port of the first outdoor heat exchanger is connected to the exhaust port through the first three-way valve and the first four-way valve in sequence, so as to control the air conditioner to enter the first exhaust defrost mode. The system controls the first throttle valve to be fully open, the main throttle valve and the second throttle valve to be in a throttled state, and the third throttle valve and the fourth throttle valve to be in a closed state. It also controls the second port of the second outdoor heat exchanger to be connected to the exhaust port in sequence through the second three-way valve and the second four-way valve, and the second port of the first outdoor heat exchanger to be connected to the intake port in sequence through the first three-way valve and the first four-way valve, so as to control the air conditioner to enter the second exhaust defrost mode.

[0016] Fourthly, the present invention also protects a control device for an air conditioner, the air conditioner comprising an outdoor unit as described in the first aspect of the present invention, or the air conditioner being as described in the second aspect of the present invention, the control method comprising: The first acquisition module is used to acquire the frosting status of the outdoor unit of the air conditioner; The second acquisition module is used to determine the defrosting mode of the air conditioner based on the frosting condition of the outdoor unit; The control module is used to control and adjust the flow state of the control valve assembly and the throttling main valve to control the air conditioner to enter the corresponding defrosting mode.

[0017] Compared with related technologies, the outdoor unit of the air conditioner of the present invention has at least the following advantages: (1) It realizes continuous heating during defrosting and avoids heating interruption: By dividing the outdoor heat exchanger into two independent units, the first outdoor heat exchanger and the second outdoor heat exchanger, and cooperating with the control valve assembly to dynamically reconstruct the refrigerant flow path, the other heat exchanger can continue to participate in the refrigerant cycle as an evaporator while performing defrosting operation on one of the heat exchangers. The compressor exhaust always supplies energy to the indoor unit through the control valve assembly, and the indoor side continuously releases heat, which completely solves the problem of heating interruption during the traditional reverse cycle defrosting process.

[0018] (2) Eliminating heat absorption during defrosting and improving thermal comfort: Since the defrosting heat source comes entirely from within the system (such as compressor exhaust or pre-throttling subcooled liquid), and there is no heat exchange coupling between the defrosting flow path and the indoor heat exchanger, the entire defrosting process does not require converting the indoor heat exchanger into an evaporator, and therefore does not absorb heat from the indoor environment. Indoor temperature fluctuations are significantly reduced, and user thermal comfort is fundamentally improved.

[0019] (3) Improve system energy efficiency and operational stability: During defrosting, the system still maintains a complete heating cycle, avoiding frequent start-stop of the compressor or drastic load fluctuations caused by reverse cycle switching, which is conducive to stable compressor operation; at the same time, since there is no need to compensate for indoor heat loss caused by defrosting, the overall energy efficiency ratio can be maintained at a high level under low temperature and high humidity conditions.

[0020] (4) Structural design supports flexible zoned defrosting strategy: The outdoor unit structure of the present invention provides basic flow path support for realizing multiple defrosting modes (such as subcooling defrosting and exhaust defrosting), so that the system can intelligently select the optimal defrosting method according to parameters such as the degree of frost and ambient temperature, taking into account both defrosting efficiency and energy efficiency performance. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of the air conditioner provided by the present invention; Figure 2 This is a schematic diagram of refrigerant flow in the first subcooling defrost mode of the air conditioner provided by the present invention.

[0023] Figure 3 This is a schematic diagram of refrigerant flow in the second subcooling defrost mode of the air conditioner provided by the present invention.

[0024] Figure 4 This is a schematic diagram of refrigerant flow in the first exhaust defrosting mode of the air conditioner provided by the present invention.

[0025] Figure 5 This is a schematic diagram of refrigerant flow in the second exhaust defrosting mode of the air conditioner provided by the present invention.

[0026] Figure 6 This is a flowchart illustrating the air conditioner control method provided by the present invention.

[0027] Figure 7 This is a schematic diagram of the structure of the air conditioner control device provided by the present invention.

[0028] Figure 8 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0029] Figure label: 11. First compressor; 12. Second compressor; 2. First outdoor heat exchanger; 3. Second outdoor heat exchanger; 4. Throttling main valve; 5. Gas-liquid separator; 6. Subcooling heat exchanger; 71. First three-way valve; 72. Second three-way valve; 81. First four-way valve; 82. Second four-way valve; 83. Third four-way valve; 91. First throttling valve; 92. Second throttling valve; 93. Third throttling valve; 94. Fourth throttling valve; 02. Indoor unit; 110. First acquisition module; 120. Second acquisition module; 130. Control module. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that in the description of the present invention, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0032] The following description, with reference to the accompanying drawings, illustrates an outdoor unit and an air conditioner according to the present invention.

[0033] like Figures 1 to 5 As shown, the outdoor unit of an air conditioner according to a first aspect embodiment of the present invention includes: a compressor, a control valve assembly, a first outdoor heat exchanger 2, a second outdoor heat exchanger 3, and a throttling main valve 4.

[0034] The compressor's exhaust port is connected to the inlet of the indoor unit 02 of the air conditioner via a control valve assembly. The outlet of the indoor unit 02 of the air conditioner is connected to the inlet of the throttling main valve 4. The outlet of the throttling main valve 4 can be selectively connected to the first port of the first outdoor heat exchanger 2 and the first port of the second outdoor heat exchanger 3.

[0035] The second port of the first outdoor heat exchanger 2 can be selectively connected to the control valve assembly and the first port of the second outdoor heat exchanger 3, respectively; the second port of the second outdoor heat exchanger 3 can be selectively connected to the control valve assembly and the first port of the first outdoor heat exchanger 2, respectively.

[0036] The control valve assembly is connected to the compressor's suction port, exhaust port, indoor unit 02's inlet, the second port of the first outdoor heat exchanger 2, and the second port of the second outdoor heat exchanger 3, respectively. The control valve assembly switches its flow state according to the different defrosting modes of the air conditioner.

[0037] According to an embodiment of the present invention, the outdoor unit of an air conditioner has the following specific structure: The compressor's exhaust port is connected to the inlet of the indoor unit 02 via a control valve assembly, forming a pathway for the high-temperature, high-pressure gaseous refrigerant to be transported to the indoor side. The outlet of the indoor unit 02 is connected to the inlet of the throttling master valve 4, allowing the medium-temperature, high-pressure liquid refrigerant after heat exchange to undergo pressure regulation via the throttling master valve 4. The outlet of the throttling master valve 4 is selectively connected to the first port of the first outdoor heat exchanger 2 and the first port of the second outdoor heat exchanger 3, thereby allowing the throttled refrigerant to be directed to either or both outdoor heat exchangers depending on the operating mode.

[0038] The second port of the first outdoor heat exchanger 2 has a dual connection path: one is connected to the control valve assembly for returning the refrigerant after heat exchange to the compressor suction side; the other is connected to the first port of the second outdoor heat exchanger 3 to realize a refrigerant series path between the two heat exchangers. Correspondingly, the second port of the second outdoor heat exchanger 3 also has a dual connection path: one is connected to the control valve assembly, and the other is connected to the first port of the first outdoor heat exchanger 2.

[0039] The control valve assembly, as the core flow path switching device, is connected to the compressor's suction port, discharge port, indoor unit O2 inlet, the second port of the first outdoor heat exchanger 2, and the second port of the second outdoor heat exchanger 3. This control valve assembly can dynamically switch the connectivity of the internal flow paths according to the current defrosting mode of the air conditioner, thereby reconstructing the refrigerant circulation path and enabling flexible switching between heating, defrosting, or evaporation functions for different heat exchangers.

[0040] The control valve assembly can be implemented using any one or more combinations of the following: a multi-four-way valve combination structure, a four-way valve and solenoid valve combination structure, an integrated multi-port switching valve, or a solenoid valve matrix structure, etc. For example, the control valve assembly includes a first four-way valve 81, a second four-way valve 82, and a third four-way valve 83. The control valve assembly achieves the required flow path switching by combining the energized or de-energized states of each four-way valve. As another example, the control valve assembly consists of a valve group composed of multiple two-position two-way or two-position three-way solenoid valves, and the opening and closing states of each solenoid valve are controlled by logic to form the required connection path between five connection points.

[0041] It is understood that any of the above implementations can satisfy the functional requirements of the control valve assembly of this invention, namely, dynamically switching the refrigerant flow path according to the defrosting mode to achieve zoned defrosting and continuous heating of the outdoor heat exchanger. This invention does not impose special restrictions on the specific composition and structure of the control valve assembly; the specific selection can be determined based on system cost, reliability, and control complexity requirements.

[0042] Furthermore, based on the above structure, the core principle of this invention is to decompose a traditional single outdoor heat exchanger into two heat exchange units with independently switchable functions, and to achieve dynamic reconstruction of the refrigerant flow path through structures such as control valve assembly and throttling main valve 4, thereby maintaining the system's continuous heating capacity during the defrosting process.

[0043] It should be noted that in traditional reverse-cycle defrosting, the four-way valve switching causes the compressor exhaust to directly enter the outdoor heat exchanger for defrosting, while the indoor heat exchanger is forced to become an evaporator, resulting in the absorption of indoor heat and interruption of heating. The outdoor unit of this invention solves the defects existing in the aforementioned related technologies. Specifically, when frost forms on the surface of an outdoor heat exchanger (such as the first outdoor heat exchanger 2) and defrosting is required, the control valve assembly switches the flow path, so that it no longer participates in the conventional refrigeration cycle as an evaporator, but instead acts as a heat-releasing component to receive heat sources from inside the system (such as subcooled liquid refrigerant before throttling or compressor exhaust), using its sensible or latent heat to melt the frost layer. At the same time, another outdoor heat exchanger (such as the second outdoor heat exchanger 3) continues to act as an evaporator, continuously absorbing heat from the environment to complete the refrigerant evaporation process and sending the gaseous refrigerant back to the compressor suction port.

[0044] It should be noted that in the outdoor unit of the air conditioner of the present invention, since the evaporation function is always undertaken by at least one outdoor heat exchanger, the refrigerant circulation of the system can operate continuously; at the same time, the defrosting heat source comes entirely from inside the system (such as compressor exhaust or subcooled liquid), and does not depend on indoor heat. Therefore, the indoor unit 02 can continue to act as a condenser to stably release heat, achieving "non-stop defrosting heat". Among them, the throttling main valve 4 and the control valve assembly play a key role in flow distribution and path selection in the above structure. For example, by controlling the on / off state of the throttling main valve 4 with the first outdoor heat exchanger 2 and the second outdoor heat exchanger 3 respectively, it is possible to accurately determine which outdoor heat exchanger the refrigerant enters after throttling, thereby cooperating with the control valve assembly to complete the zoned coordination of defrosting and evaporation functions.

[0045] The following describes in detail the working process of the outdoor unit of the present invention, taking the first outdoor heat exchanger 2 performing the first cold defrosting mode and the first exhaust defrosting mode as examples.

[0046] like Figure 2As shown, in the first subcooled defrosting mode, the defrosting heat source is the subcooled liquid refrigerant condensed by the indoor unit 02, suitable for conditions with light frost and daily continuous heating defrosting. At this time, the control valve assembly switches to a specific flow path state: the compressor discharge port remains connected to the indoor unit 02 inlet to maintain indoor heating; the compressor suction port is connected to the second port of the second outdoor heat exchanger 3, establishing a main return gas path; simultaneously, the second port of the first outdoor heat exchanger 2 is connected to the first port of the second outdoor heat exchanger 3, forming a series path, while the path between the second port of the first outdoor heat exchanger 2 and the compressor suction port is cut off, and the connection between the second port of the second outdoor heat exchanger 3 and the first port of the first outdoor heat exchanger 2 is also disconnected. The throttling main valve 4 connects its outlet only to the first port of the first outdoor heat exchanger 2, closing the path to the first port of the second outdoor heat exchanger 3. In this configuration, high-temperature, high-pressure gaseous refrigerant is discharged from the compressor outlet, enters the indoor unit 02 via the control valve assembly, and condenses and releases heat in the indoor unit 02, becoming a medium-temperature, high-pressure liquid refrigerant. This liquid refrigerant flows from the outlet of the indoor unit 02 into the inlet of the throttling valve 4, and then from the outlet of the throttling valve 4 into the first port of the first outdoor heat exchanger 2. The refrigerant in the first outdoor heat exchanger 2 uses its own sensible heat (or a small amount of latent heat of vaporization) to heat the heat exchanger fins, achieving defrosting. After defrosting, the refrigerant flows out from the second port of the first outdoor heat exchanger 2, enters the first port of the second outdoor heat exchanger 3 via a pipeline, absorbs heat from the ambient air in the second outdoor heat exchanger 3 and completely evaporates into a gaseous state. Finally, it returns from its second port to the compressor suction port via the control valve assembly, completing the cycle. Throughout the process, the indoor unit continues to be heated, the second outdoor heat exchanger 3 acts as an evaporator to maintain the system's thermal cycle, and the first outdoor heat exchanger 2 independently completes defrosting, achieving "uninterrupted heating during defrosting."

[0047] like Figure 4As shown, in the first exhaust defrosting mode, the defrosting heat source is the high-temperature, high-pressure gaseous refrigerant discharged from the compressor, suitable for conditions with severe frost buildup requiring rapid defrosting. At this time, the control valve assembly switches to another flow path state: the compressor exhaust port is simultaneously connected to the indoor unit 02 inlet and the second port of the first outdoor heat exchanger 2, forming the main heating flow path and the exhaust defrosting branch path, respectively; the compressor suction port remains connected to the second port of the second outdoor heat exchanger 3, serving as the main return gas passage; simultaneously, the first port of the first outdoor heat exchanger 2 and the first port of the second outdoor heat exchanger 3 are connected via the downstream pipe of the throttling master valve 4 to support the refrigerant confluence after defrosting. The pipe between the throttling master valve 4 and the first port of the second outdoor heat exchanger 3 is fully open, while the pipe between the throttling master valve 4 and the first port of the first outdoor heat exchanger 2 is in a throttling state. In this state, the refrigerant flows along two parallel paths: In the main heating path, a portion of the high-temperature, high-pressure gaseous refrigerant enters the indoor unit 02 from the compressor discharge port through the control valve assembly, condenses and releases heat to become liquid, and enters the throttling valve 4 from the outlet of the indoor unit 02. After throttling, it enters the first port of the second outdoor heat exchanger 3, where it evaporates, absorbs heat, and becomes gaseous. Finally, it returns to the compressor suction port from the second port of the second outdoor heat exchanger 3 through the control valve assembly; In the defrosting path, another portion of the high-temperature, high-pressure gaseous refrigerant directly enters the second port of the first outdoor heat exchanger 2 from the compressor discharge port through the control valve assembly (i.e., enters in reverse), and in the... In the first outdoor heat exchanger 2, condensation and heat release rapidly melt the frost layer. The condensed liquid refrigerant flows out from the first port of the first outdoor heat exchanger 2. This liquid refrigerant flows into the main evaporation path through the system piping (e.g., one of the two refrigerant branches connected to the outlet of the throttling valve 4), specifically, it enters the first port of the second outdoor heat exchanger 3 through the throttling pipe of the throttling valve 4. In the second outdoor heat exchanger 3, the liquid refrigerant mixes with the liquid refrigerant from the indoor unit 02, jointly absorbing heat from the ambient air and evaporating into a gaseous state. Finally, the refrigerant flows out from the second port of the second outdoor heat exchanger 3 and returns to the compressor suction port through the control valve assembly. This process also ensures continuous heating for the indoor unit 02, with the second outdoor heat exchanger 3 performing the evaporation function to maintain the circulation, while the first outdoor heat exchanger 2 achieves efficient and powerful defrosting by introducing compressor exhaust.

[0048] It should be noted that the working process of the second outdoor heat exchanger 3 in performing the second subcooling defrost mode or the second exhaust defrost mode is the same as the defrosting process of the first outdoor heat exchanger 2 described above, and the flow path is symmetrical. Only the functional roles of the first outdoor heat exchanger 2 and the second outdoor heat exchanger 3 are interchanged, so it will not be described again here.

[0049] In summary, the outdoor unit of the air conditioner of the present invention has at least the following advantages compared with related technologies: (1) It achieves continuous heating during defrosting and avoids heating interruption: By dividing the outdoor heat exchanger into two independent units, the first outdoor heat exchanger 2 and the second outdoor heat exchanger 3, and by dynamically reconfiguring the refrigerant flow path in conjunction with the control valve assembly, the other heat exchanger can continue to participate in the refrigerant cycle as an evaporator while performing defrosting operation on one of the heat exchangers. The compressor exhaust always supplies energy to the indoor unit 02 through the control valve assembly, and the indoor side continuously releases heat, which completely solves the problem of heating interruption during the traditional reverse cycle defrosting process.

[0050] (2) Eliminating heat absorption during defrosting and improving thermal comfort: Since the defrosting heat source comes entirely from within the system (such as compressor exhaust or pre-throttling subcooled liquid), and there is no heat exchange coupling between the defrosting flow path and the indoor heat exchanger, the entire defrosting process does not require converting the indoor heat exchanger into an evaporator, and therefore does not absorb heat from the indoor environment. Indoor temperature fluctuations are significantly reduced, and user thermal comfort is fundamentally improved.

[0051] (3) Improve system energy efficiency and operational stability: During defrosting, the system still maintains a complete heating cycle, avoiding frequent start-stop of the compressor or drastic load fluctuations caused by reverse cycle switching, which is conducive to stable compressor operation; at the same time, since there is no need to compensate for indoor heat loss caused by defrosting, the overall energy efficiency ratio can be maintained at a high level under low temperature and high humidity conditions.

[0052] (4) Structural design supports flexible zoned defrosting strategy: The outdoor unit structure of the present invention provides basic flow path support for realizing multiple defrosting modes (such as subcooling defrosting and exhaust defrosting), so that the system can intelligently select the optimal defrosting method according to parameters such as the degree of frost and ambient temperature, taking into account both defrosting efficiency and energy efficiency performance.

[0053] like Figure 1 As shown, according to some embodiments of the present invention, the outdoor unit of the air conditioner further includes a first three-way valve 71 and a second three-way valve 72.

[0054] The second port of the first outdoor heat exchanger 2 is connected to the inlet of the first three-way valve 71, and the two outlets of the first three-way valve 71 are respectively connected to the control valve assembly and the first port of the second outdoor heat exchanger 3.

[0055] The second port of the second outdoor heat exchanger 3 is connected to the inlet of the second three-way valve 72, and the two outlets of the second three-way valve 72 are respectively connected to the control valve assembly and the first port of the first outdoor heat exchanger 2.

[0056] With the above configuration, the first three-way valve 71 and the second three-way valve 72 can switch their internal flow paths according to the system operating mode (such as heating, subcooling defrosting or exhaust defrosting), thereby selectively directing the outlet refrigerant of each outdoor heat exchanger to the control valve assembly for return gas to the compressor, or directing it to the first port of another outdoor heat exchanger to realize a series path between the two heat exchangers, providing a reliable flow path switching basis for zoned defrosting and continuous heating.

[0057] It should be noted that the above-described structure using the first three-way valve 71 and the second three-way valve 72 is only one of the optional embodiments of the present invention and does not constitute a specific limitation on the valve structure of the present invention. In other embodiments, the functions of the first three-way valve 71 and the second three-way valve 72 can also be achieved by a valve group structure composed of multiple two-position two-way solenoid valves. For example, each three-way function can be composed of two independent two-position two-way solenoid valves connected in parallel or in series. By controlling the opening and closing state of each solenoid valve, the selective connection effect of "one inlet and two outlets" can also be achieved. Such alternative solutions are equivalent to three-way valves in terms of flow path function and belong to conventional technical means that can be reasonably expected by those skilled in the art. Therefore, the present invention does not impose special restrictions on the specific valve body form for achieving the above-mentioned flow path switching function. Any valve structure that can achieve the same fluid on / off and path selection functions should be considered to fall within the scope of the technical concept of the present invention.

[0058] like Figure 1 As shown, in some specific embodiments of the present invention, the control valve assembly includes a first four-way valve 81, a second four-way valve 82, and a third four-way valve 83.

[0059] In this configuration, one port of the first four-way valve 81 is closed, forming a refrigerant cut-off end, while the other three ports are connected to the compressor's suction port, the compressor's discharge port, and the corresponding outlet of the first three-way valve 71, respectively. This configuration allows the first four-way valve 81 to establish two interconnected flow paths between the suction port, the discharge port, and the first three-way valve 71 as needed, thereby controlling the switching of the first outdoor heat exchanger 2 between different functional states such as evaporation, defrosting, or gas return.

[0060] Correspondingly, one port of the second four-way valve 82 is also closed, forming a refrigerant cut-off end, while the other three ports are connected to the compressor's suction port, the compressor's discharge port, and the corresponding outlet end of the second three-way valve 72, respectively. Through this connection method, the second four-way valve 82 can independently regulate the refrigerant flow direction corresponding to the second outdoor heat exchanger 3, realizing flexible switching between evaporation and defrosting modes.

[0061] In addition, one port of the third four-way valve 83 is also closed, forming a refrigerant cut-off end, while the other three ports are connected to the compressor's suction port, the compressor's discharge port, and the inlet of the indoor unit 02, respectively. This third four-way valve 83 is mainly used to maintain or switch the main heating circulation path on the indoor side, ensuring that under various operating modes (including defrosting mode), the compressor discharge can selectively flow to the indoor unit 02 to continuously release heat.

[0062] In this way, through the combination of the three four-way valves with sealed ports, the control valve assembly can independently and collaboratively control the refrigerant flow direction of the first outdoor heat exchanger 2, the second outdoor heat exchanger 3, and the indoor unit 02, thereby supporting the stable operation of the system under various operating conditions such as heating, subcooling defrosting, and exhaust defrosting. While retaining the high reliability and high flow rate switching capability of the four-way valves, the above structure simplifies the flow path logic through port sealing, avoids unnecessary refrigerant bypass, and improves the system's control accuracy and energy efficiency.

[0063] It should be noted that the above-described implementation of a three-port closed four-way valve is only a preferred embodiment of the present invention, and its purpose is to clearly demonstrate the functional implementation path of the control valve assembly. Those skilled in the art can use other equivalent multi-way valve or solenoid valve combination structures to replace it according to actual needs, without departing from the technical essence of the present invention.

[0064] like Figure 1 As shown, in some embodiments of the present invention, in order to achieve precise control of the refrigerant flow rate of each branch, a branch throttling structure can be set downstream of the main throttling valve 4. Specifically, a first throttling valve 91 is provided on the pipeline between the outlet of the main throttling valve 4 and the first port of the first outdoor heat exchanger 2, and a second throttling valve 92 is provided on the pipeline between the outlet of the main throttling valve 4 and the first port of the second outdoor heat exchanger 3.

[0065] In this way, by independently adjusting the opening of the first throttle valve 91 and the second throttle valve 92, the refrigerant flow rate entering the first outdoor heat exchanger 2 and the second outdoor heat exchanger 3 can be controlled respectively, thereby optimizing the performance matching of each heat exchanger under heating, evaporation or defrosting conditions.

[0066] like Figure 1 As shown, further, in some other embodiments of the present invention, to enhance the flexibility and control precision of refrigerant distribution during defrosting, an auxiliary throttling element can be added between the three-way valve and the corresponding outdoor heat exchanger. Specifically, a third throttling valve 93 is provided on the pipeline between the first three-way valve 71 and the first port of the first outdoor heat exchanger 2, and a fourth throttling valve 94 is provided on the pipeline between the second three-way valve 72 and the first port of the second outdoor heat exchanger 3.

[0067] In this way, when the refrigerant after defrosting needs to flow back into another outdoor heat exchanger through the three-way valve, the third throttling valve 93 or the fourth throttling valve 94 can perform secondary throttling or flow regulation on the return refrigerant, preventing the liquid refrigerant from entering the compressor without sufficient evaporation, thereby improving the safety and stability of system operation.

[0068] It should be noted that the first to fourth throttle valves 91 can be in the form of electronic expansion valves, stepper motor driven throttle valves or fixed orifice throttle devices, etc. The specific type and control method can be flexibly selected according to the system control strategy and cost requirements. This invention does not impose any special restrictions here.

[0069] like Figure 1 As shown, in some embodiments of the present invention, the outdoor unit of the air conditioner further includes a subcooling heat exchanger 6. The subcooling heat exchanger 6 is disposed on the refrigerant pipeline between the inlet of the throttling main valve 4 and the outlet of the indoor unit 02, that is, located after the outlet of the indoor unit 02 and before the inlet of the throttling main valve 4.

[0070] During system operation, the medium-temperature, high-pressure liquid refrigerant flowing from indoor unit 02 first enters the subcooling heat exchanger 6, where it exchanges heat with the low-temperature, low-pressure return-gas side refrigerant (such as gaseous refrigerant from the outdoor heat exchanger), thereby further reducing the temperature of the liquid refrigerant and obtaining a liquid refrigerant with a higher degree of subcooling. This subcooled liquid refrigerant then enters the throttling main valve 4 for throttling and pressure reduction.

[0071] Thus, by introducing the subcooling heat exchanger 6, this invention can, on the one hand, increase the subcooling degree of the refrigerant before throttling, effectively reducing the proportion of flash gas during the throttling process and improving the quality of the liquid refrigerant entering the outdoor heat exchanger, thereby enhancing the evaporation heat exchange efficiency; on the other hand, in the subcooling defrost mode, the sensible heat carried by the subcooled liquid itself can serve as a defrosting heat source, helping to achieve a gentler and more efficient defrosting process, avoiding excessive reliance on compressor exhaust, and reducing energy consumption.

[0072] like Figures 1 to 5 As shown, in a second aspect, the present invention also protects an air conditioner, including an outdoor unit of the air conditioner as described in the first aspect of the present invention, and an indoor unit 02. The compressor's exhaust port is connected to the inlet of the indoor unit 02 of the air conditioner via a control valve assembly, and the outlet of the indoor unit 02 of the air conditioner is connected to the inlet of the throttling master valve 4.

[0073] The air conditioner according to the second aspect embodiment of the present invention has similar effects to the outdoor unit of the air conditioner according to the first aspect embodiment of the present invention, and will not be described again here.

[0074] The following details specific embodiments of the air conditioner of the present invention under various defrosting modes, wherein the defrosting modes of the air conditioner include a first subcooling defrosting mode, a second subcooling defrosting mode, a first exhaust defrosting mode, and a second exhaust defrosting mode.

[0075] like Figure 2 As shown, in the first subcooled defrosting mode, the system is suitable for conditions where the surface of the first outdoor heat exchanger 2 has a light degree of frost, the ambient temperature is relatively high, and the defrosting heat load is small. At this time, the air conditioner does not need to use the high-energy-consuming compressor to discharge for defrosting, but instead uses the subcooled liquid refrigerant obtained by further cooling the indoor unit 02 after cooling through the cold heat exchanger 6 as the defrosting heat source. Specifically, the main throttling valve 4 opens the branch leading to the first outdoor heat exchanger 2, the first throttling valve 91 is fully open to avoid additional pressure drop, the second throttling valve 92 is closed; the third throttling valve 93 is in a throttling state, and the fourth throttling valve 94 is closed; the first three-way valve 71 switches to connect the second port of the first outdoor heat exchanger 2 to the third throttling valve 93 (i.e., guides to the second outdoor heat exchanger 3 side), the second three-way valve 72 switches to connect the second port of the second outdoor heat exchanger 3 to the second four-way valve 82; the second four-way valve 82 is energized, so that the compressor's suction port is connected to the second three-way valve 72; the third four-way valve 83 remains in heating state, connecting the compressor's discharge port to the indoor unit 02 inlet. The refrigerant flow is as follows: The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the indoor unit 02 through the third four-way valve 83. In the indoor unit 02, it condenses and releases heat, becoming a medium-temperature, high-pressure liquid refrigerant. This liquid refrigerant flows through the cold heat exchanger 6, where it exchanges heat with the low-temperature return gas for further subcooling. It then enters the first port of the first outdoor heat exchanger 2 through the main throttling valve 4 and the first throttling valve 91 (fully open), where it absorbs its own sensible heat to achieve subcooling defrosting. After defrosting, the refrigerant flows out from the second port of the first outdoor heat exchanger 2, passing sequentially through the first three-way valve 71 and the third throttling valve 93. After throttling and pressure reduction, it enters the first port of the second outdoor heat exchanger 3, where it evaporates and absorbs heat, becoming gaseous. Finally, it returns to the compressor suction port through the second three-way valve 72 and the second four-way valve 82. This mode is energy efficient, provides a gradual defrosting temperature rise, and offers continuous indoor heating, making it suitable for mild frosting scenarios.

[0076] like Figure 3As shown, in the second subcooling defrost mode, the system is suitable for situations where the second outdoor heat exchanger 3 has relatively light frost buildup, and its control logic is symmetrical to that of the first subcooling defrost mode. At this time, the main throttling valve 4 opens the branch leading to the second outdoor heat exchanger 3, the second throttling valve 92 is fully open, and the first throttling valve 91 is closed; the fourth throttling valve 94 is in a throttling state, and the third throttling valve 93 is closed; the second three-way valve 72 switches to connect the second port of the second outdoor heat exchanger 3 to the fourth throttling valve 94 (i.e., guides to the side of the first outdoor heat exchanger 2), and the first three-way valve 71 switches to connect the second port of the first outdoor heat exchanger 2 to the first four-way valve 81; the first four-way valve 81 is energized, connecting the compressor suction port to the first three-way valve 71; the third four-way valve 83 remains in a heating state. The refrigerant flow is as follows: Compressor exhaust enters indoor unit 02 via the third four-way valve 83 for condensation. The liquid refrigerant, after being subcooled by the cold heat exchanger 6, enters the first port of the second outdoor heat exchanger 3 via the main throttling valve 4 and the second throttling valve 92 (fully open) for subcooling and defrosting. After defrosting, the refrigerant flows out from the second port of the second outdoor heat exchanger 3, sequentially passing through the second three-way valve 72 and the fourth throttling valve 94. After throttling and pressure reduction, it enters the first port of the first outdoor heat exchanger 2, where it evaporates and absorbs heat. Finally, it returns to the compressor suction port via the first three-way valve 71 and the first four-way valve 81. This mode also achieves low-energy consumption and continuous heating defrosting, suitable for operating conditions with slight frosting on the second heat exchanger.

[0077] like Figure 4As shown, in the first exhaust defrosting mode, the system is suitable for harsh operating conditions such as severe frost buildup on the first outdoor heat exchanger 2, thick frost layers, or extremely high ambient humidity, requiring rapid and powerful defrosting to restore heat exchange performance. At this time, the main throttling valve 4 opens the branch to the second outdoor heat exchanger 3, the second throttling valve 92 is fully open to ensure the main evaporation flow, and the first throttling valve 91 is in a throttling state; the first three-way valve 71 switches to connect the second port of the first outdoor heat exchanger 2 to the first four-way valve 81, and the second three-way valve 72 switches to connect the second port of the second outdoor heat exchanger 3 to the second four-way valve 82; the first four-way valve 81 is de-energized, so that its exhaust port is connected to the first three-way valve 71, and the second four-way valve 82 is energized, so that its intake port is connected to the second three-way valve 72; the third four-way valve 83 remains in the heating state. The system forms a dual-flow path: In the main heating flow path, compressor exhaust passes through the third four-way valve 83, indoor unit 02, subcooling heat exchanger 6, throttling main valve 4, second throttling valve 92 (fully open), and the first port of the second outdoor heat exchanger 3. After evaporating and absorbing heat in this path, it returns to the compressor suction port via the second three-way valve 72 and the second four-way valve 82. In the exhaust defrosting flow path, another portion of compressor exhaust passes through the first four-way valve 81 and the first three-way valve 71, then flows in the opposite direction into the second port of the first outdoor heat exchanger 2. In the first outdoor heat exchanger 2, it condenses and releases heat for rapid defrosting. The condensate flows out from its first port, is throttled by the first throttling valve 91, and then flows into the first port of the second outdoor heat exchanger 3, where it mixes with the refrigerant in the main path and evaporates together. This mode provides rapid defrosting and uninterrupted heating, making it suitable for severe frosting scenarios.

[0078] like Figure 5As shown, in the second exhaust defrosting mode, the system is suitable for situations where the second outdoor heat exchanger 3 is severely frosted, and its control strategy is symmetrical to that of the first exhaust defrosting mode. At this time, the main throttling valve 4 opens the branch leading to the first outdoor heat exchanger 2, the first throttling valve 91 is fully open, and the second throttling valve 92 throttles; the second three-way valve 72 switches to connect the second port of the second outdoor heat exchanger 3 to the second four-way valve 82, and the first three-way valve 71 switches to connect the second port of the first outdoor heat exchanger 2 to the first four-way valve 81; the second four-way valve 82 is de-energized, so that its exhaust port is connected to the second three-way valve 72, and the first four-way valve 81 is energized, so that its intake port is connected to the first three-way valve 71; the third four-way valve 83 remains in heating mode. The main heating flow path is as follows: compressor exhaust passes through the third four-way valve 83, indoor unit 02, subcooling heat exchanger 6, throttling main valve 4, first throttling valve 91 (fully open), first outdoor heat exchanger 2, first three-way valve 71, and first four-way valve 81, finally reaching the compressor suction port. The exhaust defrosting flow path is as follows: compressor exhaust passes through the second four-way valve 82 and the second three-way valve 72, then reverses direction to enter the second port of the second outdoor heat exchanger 3 for defrosting. The condensate flows out from its first port, is throttled by the second throttling valve 92, and then flows into the first port of the first outdoor heat exchanger 2. After evaporation, it returns to the air via the first four-way valve 81. This mode also achieves coordinated operation of powerful defrosting and continuous heating, suitable for extreme conditions of heavy frosting on the second heat exchanger.

[0079] like Figure 1 As shown, according to some embodiments of the present invention, the compressor may include two parallel first compressors 11 and second compressors 12; a gas-liquid separator 5 is also provided between the compressor's intake port and the control valve assembly.

[0080] The air conditioner control method and control device proposed in this invention are described below with reference to the accompanying drawings. Before providing a detailed description of the embodiments of this invention, the overall application scenario is first described. The air conditioner control method, control device, electronic device, and computer-readable storage medium of this invention can be applied locally to the air conditioner, to cloud platforms in the Internet field, or to other types of cloud platforms in the Internet field, or to third-party devices. These third-party devices may include various types such as mobile phones, tablets, laptops, in-vehicle computers, and other smart terminals.

[0081] The following description uses only the control method applicable to air conditioners as an example. It should be understood that the control method of this embodiment can also be applied to cloud platforms and third-party devices.

[0082] like Figure 6 As shown, in a third aspect, the present invention protects a control method for an air conditioner, comprising: Step S1: Obtain the frost status of the outdoor unit of the air conditioner.

[0083] Step S1 described above can be implemented in various ways. For example, it can involve detecting the surface temperature, pipe temperature, fan current, inlet and outlet pressure difference of the heat exchanger, and cumulative operating time of the first outdoor heat exchanger 2 and / or the second outdoor heat exchanger 3, or combining data from ambient temperature and humidity sensors to comprehensively determine the degree and location of frost on each heat exchanger. The system can identify whether the first outdoor heat exchanger 2 is frosted, whether the second outdoor heat exchanger 3 is frosted, and the severity of the frost, such as light, moderate, or severe.

[0084] Step S2: Determine the defrost mode of the air conditioner based on the frost condition of the outdoor unit.

[0085] For step S2, if only the first outdoor heat exchanger 2 is lightly frosted, the first subcooling defrost mode is selected; if only the second outdoor heat exchanger 3 is lightly frosted, the second subcooling defrost mode is selected; if the first outdoor heat exchanger 2 is heavily frosted, the first exhaust defrost mode is selected; and if the second outdoor heat exchanger 3 is heavily frosted, the second exhaust defrost mode is selected. In the case of simultaneous frosting of both heat exchangers, the appropriate mode can be executed either by prioritizing or alternating according to the severity of the frosting.

[0086] Step S3: Control the flow state of the regulating control valve assembly and the throttling main valve 4 to control the air conditioner to enter the corresponding defrosting mode.

[0087] Step S3 specifically includes: sending energizing or de-energizing signals to the first four-way valve 81, the second four-way valve 82, and the third four-way valve 83 to control the switching of their internal flow paths; adjusting the valve core positions of the first three-way valve 71 and the second three-way valve 72 to select the refrigerant flow direction; controlling the opening and closing of the outlet of the main throttling valve 4, and coordinating with the opening adjustment of the first throttling valve 91 to the fourth throttling valve 94 to achieve precise distribution of refrigerant flow in each branch. Through the above coordinated control, the refrigerant in the system flows along the path corresponding to the target defrosting mode, thereby ensuring efficient defrosting of the designated outdoor heat exchanger while ensuring that the other heat exchanger continues to operate as an evaporator, maintaining continuous heating for the indoor unit 02.

[0088] In summary, the control method of the present invention fully utilizes the structural advantages of the outdoor unit of the air conditioner, achieving the technical effects of on-demand defrosting, precise control, and uninterrupted heating, significantly improving energy efficiency and user comfort under low-temperature heating conditions.

[0089] Furthermore, the steps for determining the air conditioner's defrost mode based on the outdoor unit's frosting condition include: If the first outdoor heat exchanger 2 is frosted and the degree of frosting is less than or equal to the first set degree of frosting, the air conditioner is determined to operate in the first subcooling defrosting mode. If the first outdoor heat exchanger 2 is frosted and its frosting degree is greater than or equal to the second set frosting degree, the air conditioner is determined to operate in the first exhaust defrosting mode. If the second outdoor heat exchanger 3 is frosted and the degree of frosting is less than or equal to the first set degree of frosting, the air conditioner is determined to operate in the second subcooling defrosting mode. If the second outdoor heat exchanger 3 is frosted and the degree of frosting is greater than or equal to the second set degree of frosting, the air conditioner is set to operate in the second exhaust defrosting mode.

[0090] The first preset frosting level is less than or equal to the second preset frosting level. There can be an overlap or a threshold interval between the two to avoid frequent mode switching. For example, the first preset frosting level can be set to a "light frosting" threshold, such as when the heat exchanger surface temperature is below 0°C and the operating time exceeds 30 minutes; the second preset frosting level can be set to a "heavy frosting" threshold, such as when the fan current drops by 15% or the differential pressure exceeds a preset value. When the frosting level is between the two, the system can maintain the current mode or make predictive decisions based on historical trends.

[0091] In summary, the aforementioned grading mechanism enables the air conditioner to intelligently select the most suitable defrosting strategy based on the actual severity of frost buildup: when frost is light, it prioritizes the more energy-efficient subcooling defrosting mode to avoid unnecessary exhaust energy consumption; when frost is severe, it switches to the more powerful exhaust defrosting mode to ensure rapid restoration of heat exchange performance. Thus, while ensuring continuous indoor heating, it achieves an optimal balance between defrosting efficiency and system energy efficiency.

[0092] Furthermore, the steps of controlling the flow state of the regulating valve assembly and the throttling valve 4 to control the air conditioner to enter the corresponding defrost mode specifically include: The main throttling valve 4 and the first throttling valve 91 are fully open, the third throttling valve 93 is throttled, and the second throttling valve 92 and the fourth throttling valve 94 are closed. The second port of the first outdoor heat exchanger 2 is connected to the air intake through the first three-way valve 71 and the first four-way valve 81 in sequence, so as to control the air conditioner to enter the first subcooling defrost mode. The main throttling valve 4 and the second throttling valve 92 are fully open, the fourth throttling valve 94 is throttled, and the first throttling valve 91 and the third throttling valve 93 are closed. The second port of the second outdoor heat exchanger 3 is connected to the air intake through the second three-way valve 72 and the second four-way valve 82 in sequence to control the air conditioner to enter the second subcooling defrost mode. The second throttle valve 92 is controlled to be fully open, the main throttle valve 4 and the first throttle valve 91 are in a throttle state, and the third throttle valve 93 and the fourth throttle valve 94 are both in a closed state. The second port of the second outdoor heat exchanger 3 is controlled to be connected to the air intake through the second three-way valve 72 and the second four-way valve 82 in sequence, and the second port of the first outdoor heat exchanger 2 is connected to the exhaust port through the first three-way valve 71 and the first four-way valve 81 in sequence, so as to control the air conditioner to enter the first exhaust defrost mode. The system controls the first throttle valve 91 to be fully open, the main throttle valve 4 and the second throttle valve 92 to be in a throttling state, and the third throttle valve 93 and the fourth throttle valve 94 to be in a closed state. It also controls the second port of the second outdoor heat exchanger 3 to be connected to the exhaust port through the second three-way valve 72 and the second four-way valve 82 in sequence, and the second port of the first outdoor heat exchanger 2 to be connected to the intake port through the first three-way valve 71 and the first four-way valve 81 in sequence, so as to control the air conditioner to enter the second exhaust defrosting mode.

[0093] In this embodiment, the refrigerant path for each defrosting mode is described as follows: like Figure 2 As shown, after the air conditioner enters the first subcooling defrost mode, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor enters the indoor unit 02 through the third four-way valve 83. After being cooled in the indoor unit 02, it is further cooled by the cold heat exchanger 6 and becomes subcooled liquid refrigerant. The subcooled liquid refrigerant enters the first port of the first outdoor heat exchanger 2 through the throttling main valve 4 and the first throttling valve 91 (fully open), where it absorbs its own sensible heat for subcooling defrosting. The defrosted refrigerant flows out from the second port of the first outdoor heat exchanger 2, flows through the first three-way valve 71 and the third throttling valve 93 in sequence, and after throttling and pressure reduction, it enters the first port of the second outdoor heat exchanger 3, where it evaporates and absorbs heat to become gaseous. Finally, the gaseous refrigerant returns to the compressor suction port through the second three-way valve 72 and the second four-way valve 82.

[0094] like Figure 3 As shown, after the air conditioner enters the second subcooling defrost mode, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor enters the indoor unit 02 through the third four-way valve 83. After being cooled in the indoor unit 02, it is further cooled by the cold heat exchanger 6 and becomes subcooled liquid refrigerant. The subcooled liquid refrigerant enters the first port of the second outdoor heat exchanger 3 through the throttling main valve 4 and the second throttling valve 92 (fully open), where it absorbs its own sensible heat for subcooling defrosting. The defrosted refrigerant flows out from the second port of the second outdoor heat exchanger 3, flows through the second three-way valve 72 and the fourth throttling valve 94 in sequence, and after throttling and pressure reduction, it enters the first port of the first outdoor heat exchanger 2, where it evaporates and absorbs heat to become gaseous. Finally, the gaseous refrigerant returns to the compressor suction port through the first three-way valve 71 and the first four-way valve 81.

[0095] like Figure 4As shown, after the air conditioner enters the first exhaust defrosting mode, the refrigerant path is divided into a parallel main heating flow path and an exhaust defrosting flow path. In the main heating flow path, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the indoor unit 02 through the third four-way valve 83. After being cooled in the indoor unit 02, it is further cooled by the cold heat exchanger 6 and becomes a subcooled liquid refrigerant. This liquid refrigerant enters the first port of the second outdoor heat exchanger 3 through the throttling main valve 4 and the second throttling valve 92 (fully open), where it evaporates and absorbs heat to become gaseous. Finally, this gaseous refrigerant returns to the compressor suction port through the second three-way valve 72 and the second four-way valve 82. In the exhaust defrosting flow path, another part of the high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the first three-way valve 71 through the first four-way valve 81, and then enters the second port of the first outdoor heat exchanger 2 in reverse, where it condenses and releases heat to quickly defrost. The condensate flows out from its first port, is throttled by the first throttling valve 91, and then flows into the first port of the second outdoor heat exchanger 3, where it mixes with the main refrigerant and evaporates together.

[0096] like Figure 5 As shown, after the air conditioner enters the second exhaust defrosting mode, the refrigerant path is divided into a parallel main heating flow path and an exhaust defrosting flow path. In the main heating flow path, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the indoor unit 02 through the third four-way valve 83. After being cooled in the indoor unit 02, it is further cooled by the cold heat exchanger 6 and becomes a subcooled liquid refrigerant. This liquid refrigerant enters the first port of the first outdoor heat exchanger 2 through the throttling main valve 4 and the first throttling valve 91 (fully open), where it evaporates and absorbs heat to become gaseous. Finally, this gaseous refrigerant returns to the compressor suction port through the first three-way valve 71 and the first four-way valve 81. In the exhaust defrosting flow path, another part of the high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the second three-way valve 72 through the second four-way valve 82, and then enters the second port of the second outdoor heat exchanger 3 in reverse, where it condenses and releases heat to quickly defrost. The condensate flows out from its first port, is throttled by the second throttling valve 92, and then flows into the first port of the first outdoor heat exchanger 2, where it mixes with the main refrigerant and evaporates together.

[0097] In summary, through the detailed operating steps described above, the system can intelligently select the most suitable defrosting mode based on the actual frosting situation, and achieve the corresponding refrigerant flow path by precisely controlling the status of each valve, thereby maintaining continuous indoor heating while defrosting efficiently.

[0098] The control device for an air conditioner provided by the present invention will be described below. The control device for an air conditioner described below can be referred to in correspondence with the control method for an air conditioner described above.

[0099] like Figure 7 As shown, the control device for an air conditioner according to a fourth aspect embodiment of the present invention includes: The first acquisition module 110 is used to acquire the frosting status of the outdoor unit of the air conditioner; The second acquisition module 120 is used to determine the defrosting mode of the air conditioner based on the frosting condition of the outdoor unit; The control module 130 is used to control the flow state of the regulating control valve assembly and the throttling main valve 4 to control the air conditioner to enter the corresponding defrosting mode.

[0100] Figure 8 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 8 As shown, the electronic device may include a processor 810, a communication interface 820, a memory 830, and a communication bus 840. The processor 810, communication interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logical instructions from the memory 830 to execute air conditioner control methods, including: acquiring the frosting status of the outdoor unit; determining the defrosting mode of the air conditioner based on the frosting status; and controlling the flow state of the regulating control valve assembly and the throttling main valve 4 to control the air conditioner to enter the corresponding defrosting mode.

[0101] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0102] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by the computer, the computer can execute the air conditioner control method provided by the above methods, including: obtaining the frosting status of the outdoor unit of the air conditioner; determining the defrosting mode of the air conditioner based on the frosting status of the outdoor unit; and controlling the flow state of the regulating control valve assembly and the throttling main valve 4 to control the air conditioner to enter the corresponding defrosting mode.

[0103] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control methods of the air conditioner provided above, including: acquiring the frosting status of the outdoor unit of the air conditioner; determining the defrosting mode of the air conditioner based on the frosting status of the outdoor unit; and controlling the flow state of the regulating control valve assembly and the throttling main valve 4 to control the air conditioner to enter the corresponding defrosting mode.

[0104] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0105] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An outdoor unit of an air conditioner, characterized in that, include: Compressor, control valve assembly, first outdoor heat exchanger, second outdoor heat exchanger, throttling main valve; The compressor's exhaust port is connected to the inlet of the air conditioner's indoor unit via the control valve assembly, and the air conditioner's indoor unit's outlet is connected to the inlet of the throttling main valve. The outlet of the throttling main valve is selectively connected to the first port of the first outdoor heat exchanger and the first port of the second outdoor heat exchanger, respectively. The second port of the first outdoor heat exchanger is selectively connected to the control valve assembly and the first port of the second outdoor heat exchanger, respectively; the second port of the second outdoor heat exchanger is selectively connected to the control valve assembly and the first port of the first outdoor heat exchanger, respectively. The control valve assembly is connected to the air intake of the compressor, the air exhaust, the inlet of the indoor unit, the second port of the first outdoor heat exchanger, and the second port of the second outdoor heat exchanger. The control valve assembly switches its flow state according to the different defrosting modes of the air conditioner.

2. The outdoor unit of the air conditioner according to claim 1, characterized in that, Also includes: The first three-way valve has its second port connected to the inlet of the first three-way valve, and its two outlets are respectively connected to the control valve assembly and the first port of the second outdoor heat exchanger. The second three-way valve is connected to the inlet of the second outdoor heat exchanger at the second port, and the two outlets of the second three-way valve are respectively connected to the control valve assembly and the first port of the first outdoor heat exchanger.

3. The outdoor unit of the air conditioner according to claim 2, characterized in that, The control valve assembly includes a first four-way valve, a second four-way valve, and a third four-way valve; In this configuration, one port of the first four-way valve is closed to form a refrigerant cutoff end, and the other three ports are respectively connected to the air intake, the exhaust port, and the first three-way valve; one port of the second four-way valve is closed to form a refrigerant cutoff end, and the other three ports are respectively connected to the air intake, the exhaust port, and the second three-way valve; one port of the third four-way valve is closed to form a refrigerant cutoff end, and the other three ports are respectively connected to the air intake, the exhaust port, and the inlet of the indoor unit.

4. The outdoor unit of the air conditioner according to claim 3, characterized in that, The defrosting modes of the air conditioner include at least one of the following: a first subcooling defrosting mode, a second subcooling defrosting mode, a first exhaust defrosting mode, and a second exhaust defrosting mode. In the first subcooled defrosting mode, the throttling main valve is only connected to the first port of the first outdoor heat exchanger, and the second port of the first outdoor heat exchanger is connected to the air intake through the first three-way valve and the first four-way valve in sequence; the second port of the second outdoor heat exchanger is connected to the first port of the first outdoor heat exchanger through the second three-way valve. In the second subcooling defrost mode, the throttling main valve is only connected to the first port of the second outdoor heat exchanger, and the second port of the second outdoor heat exchanger is connected to the air intake in sequence through the second three-way valve and the second four-way valve; the second port of the first outdoor heat exchanger is connected to the first port of the second outdoor heat exchanger through the first three-way valve. In the first exhaust defrosting mode, the exhaust port is connected to the intake port in sequence through the first four-way valve, the first three-way valve, the first outdoor heat exchanger, the second outdoor heat exchanger, the second three-way valve, and the second four-way valve; and the exhaust port is connected to the intake port in sequence through the third four-way valve, the indoor unit, the throttling main valve, the second outdoor heat exchanger, the second three-way valve, and the second four-way valve. In the second exhaust defrosting mode, the exhaust port is connected to the air intake port in sequence through the second four-way valve, the second three-way valve, the second outdoor heat exchanger, the first outdoor heat exchanger, the first three-way valve, and the first four-way valve. In addition, the exhaust port is connected to the air intake port in sequence through the third four-way valve, the indoor unit, the throttling main valve, the first outdoor heat exchanger, the first three-way valve, and the first four-way valve.

5. The outdoor unit of the air conditioner according to any one of claims 2 to 4, characterized in that, A first throttling valve is provided between the outlet of the main throttling valve and the first port of the first outdoor heat exchanger, and a second throttling valve is provided between the outlet of the main throttling valve and the first port of the second outdoor heat exchanger. And / or, a third throttle valve is provided between the first three-way valve and the first port of the first outdoor heat exchanger, and a fourth throttle valve is provided between the second three-way valve and the first port of the second outdoor heat exchanger.

6. The outdoor unit of the air conditioner according to any one of claims 1 to 4, characterized in that, It also includes a subcooling heat exchanger, which is located between the inlet of the main throttling valve and the outlet of the indoor unit.

7. An air conditioner, characterized in that, The air conditioner includes an outdoor unit as described in any one of claims 1 to 6, and also includes an indoor unit; the exhaust port of the compressor is connected to the inlet of the indoor unit of the air conditioner through the control valve assembly, and the outlet of the indoor unit of the air conditioner is connected to the inlet of the throttling master valve.

8. A method for controlling an air conditioner, wherein the air conditioner includes an outdoor unit of the air conditioner as described in any one of claims 1 to 6, or the air conditioner is the air conditioner as described in claim 7, the control method comprising: Obtain the frosting status of the outdoor unit of the air conditioner; The defrosting mode of the air conditioner is determined based on the frosting condition of the outdoor unit. The flow state of the control valve assembly and the throttling main valve is controlled to control the air conditioner to enter the corresponding defrosting mode.

9. The air conditioning control method according to claim 8, characterized in that, The step of determining the defrosting mode of the air conditioner based on the frosting condition of the outdoor unit includes: If the first outdoor heat exchanger is frosted and the degree of frosting is less than or equal to the first set degree of frosting, the air conditioner is determined to operate in the first subcooling defrosting mode. If the first outdoor heat exchanger is frosted and the degree of frosting is greater than or equal to the second set degree of frosting, the air conditioner is determined to operate in the first exhaust defrosting mode. If the second outdoor heat exchanger is frosted and the degree of frosting is less than or equal to the first set degree of frosting, the air conditioner is determined to operate in the second subcooling defrosting mode. If the second outdoor heat exchanger is frosted and the degree of frosting is greater than or equal to the second set degree of frosting, the air conditioner is determined to operate in the second exhaust defrosting mode. Wherein, the first set frosting degree is less than or equal to the second set frosting degree.

10. The air conditioning control method according to claim 9, characterized in that, The step of controlling and adjusting the flow state of the control valve assembly and the throttling main valve to control the air conditioner to enter the corresponding defrost mode specifically includes: The main throttling valve and the first throttling valve are fully open, the third throttling valve is throttled, and the second and fourth throttling valves are closed. The second port of the first outdoor heat exchanger is connected to the air intake through the first three-way valve and the first four-way valve in sequence to control the air conditioner to enter the first subcooling defrost mode. The main throttling valve and the second throttling valve are fully open, the fourth throttling valve is in a throttling state, and the first throttling valve and the third throttling valve are both closed. The second port of the second outdoor heat exchanger is connected to the air intake through the second three-way valve and the second four-way valve in sequence to control the air conditioner to enter the second subcooling defrost mode. The second throttle valve is controlled to be fully open, the main throttle valve and the first throttle valve are in a throttle state, and the third throttle valve and the fourth throttle valve are both in a closed state. The second port of the second outdoor heat exchanger is controlled to be connected to the air intake through the second three-way valve and the second four-way valve in sequence, and the second port of the first outdoor heat exchanger is connected to the exhaust port through the first three-way valve and the first four-way valve in sequence, so as to control the air conditioner to enter the first exhaust defrost mode. The system controls the first throttle valve to be fully open, the main throttle valve and the second throttle valve to be in a throttled state, and the third throttle valve and the fourth throttle valve to be in a closed state. It also controls the second port of the second outdoor heat exchanger to be connected to the exhaust port in sequence through the second three-way valve and the second four-way valve, and the second port of the first outdoor heat exchanger to be connected to the intake port in sequence through the first three-way valve and the first four-way valve, so as to control the air conditioner to enter the second exhaust defrost mode.

11. A control device for an air conditioner, characterized in that, The air conditioner includes the outdoor unit of the air conditioner as described in any one of claims 1 to 6, or the air conditioner is the air conditioner as described in claim 7, and the control method includes: The first acquisition module is used to acquire the frosting status of the outdoor unit of the air conditioner; The second acquisition module is used to determine the defrosting mode of the air conditioner based on the frosting condition of the outdoor unit; The control module is used to control and adjust the flow state of the control valve assembly and the throttling main valve to control the air conditioner to enter the corresponding defrosting mode.

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