Energy-saving control method of air conditioner

Abstract

The invention provides an energy-saving control method of an air conditioner. A first control mode and a second control mode are arranged in the air conditioner; the energy-saving control method comprises the steps that the outdoor environment temperature is obtained; judging whether a second control mode needs to be entered or not; if yes, the operation frequency of the compressor in the first control mode is obtained, and the first operation frequency is obtained; according to the first operation frequency, the operation frequency of the compressor in a second control mode is determined, and a second operation frequency is obtained; the second operation frequency is smaller than the first operation frequency; according to the outdoor environment temperature and the second operation frequency, a first target refrigerant flow path in the heat exchanger is determined, so that the refrigerant flow path in the heat exchanger corresponds to the outdoor environment temperature and the operation frequency of the compressor; and the compressor is made to operate according to the second operation frequency, and a refrigerant flow path in the heat exchanger is made to be the first target refrigerant flow path. The problem that an existing energy-saving method of the air conditioner cannot give consideration to the comfort level of a user and the energy-saving effect is solved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an energy-saving control method for air conditioners. Background Technology

[0002] Currently, energy conservation has become a crucial direction for the air conditioning industry. Existing air conditioners typically achieve energy savings by reducing compressor frequency. However, reducing compressor frequency directly weakens the system's heat exchange capacity, making it difficult to meet users' comfort needs. To compensate for this capacity loss, the fan speed usually needs to be increased, which in turn offsets some of the energy-saving effect of reducing compressor frequency. Therefore, existing energy-saving control methods struggle to balance user comfort with energy efficiency. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide an energy-saving control method for an air conditioner that overcomes or at least partially solves the above problems, and can solve the problem that existing energy-saving methods for air conditioners cannot simultaneously take into account user comfort and energy-saving effect.

[0004] Specifically, the present invention provides an energy-saving control method for an air conditioner, the air conditioner including a compressor and a heat exchanger; the air conditioner has a first control mode and a second control mode; The energy-saving control method includes: Obtain the outdoor ambient temperature; Determine whether it is necessary to enter the second control mode; If so, obtain the operating frequency of the compressor in the first control mode to obtain the first operating frequency; The operating frequency of the compressor in the second control mode is determined based on the first operating frequency to obtain the second operating frequency; the second operating frequency is less than the first operating frequency. Based on the outdoor ambient temperature and the second operating frequency, a first target refrigerant flow path is determined within the heat exchanger so that the refrigerant flow path within the heat exchanger corresponds to the outdoor ambient temperature and the operating frequency of the compressor. The compressor is operated at the second operating frequency, and the refrigerant flow path in the heat exchanger is the first target refrigerant flow path.

[0005] Optionally, determining the operating frequency of the compressor in the second control mode based on the first operating frequency includes: The energy-saving ratio is determined based on the outdoor ambient temperature. The frequency adjustment coefficient is determined based on the indoor target temperature, the energy-saving ratio, and the outdoor ambient temperature. The second operating frequency is determined based on the frequency adjustment coefficient and the operating frequency of the compressor in the first control mode.

[0006] Optionally, determining the frequency adjustment coefficient based on the indoor target temperature, the energy-saving ratio, and the outdoor ambient temperature includes: Calculate the absolute value of the difference between the outdoor ambient temperature and the indoor target temperature; The adjustment ratio is determined based on the energy-saving ratio; the larger the adjustment ratio, the smaller the corresponding energy-saving ratio. The frequency adjustment coefficient is determined based on the absolute value of the difference and the adjustment ratio.

[0007] Optionally, the decision to enter the second control mode can be made based on the outdoor ambient temperature.

[0008] Optionally, the energy-saving control method further includes: When the air conditioner is in the first control mode, the operating frequency of the compressor in the first control mode is obtained to obtain the first operating frequency; Based on the outdoor ambient temperature and the first operating frequency, a second target refrigerant flow path is determined within the heat exchanger so that the refrigerant flow path within the heat exchanger corresponds to the outdoor ambient temperature and the operating frequency of the compressor. The compressor is operated at the first operating frequency, and the refrigerant flow path in the heat exchanger is the second target refrigerant flow path.

[0009] Optionally, the heat exchanger is an indoor heat exchanger or an outdoor heat exchanger; The heat exchanger includes: The first tube has a first port, a plurality of second ports, a third port and a fourth port arranged sequentially along its extension direction; a first switching device is arranged between every two adjacent second ports, a second switching device is arranged between the last second port and the third port, and a third switching device is arranged between the third port and the fourth port. The second pipe has a plurality of fifth, sixth, seventh and eighth ports arranged sequentially along its extension direction; a fourth switching device is arranged between every two adjacent fifth ports; a fifth switching device is arranged between the last fifth port and the sixth port, and a sixth switching device is arranged between the sixth port and the seventh port. Multiple heat exchange tubes, including multiple first heat exchange tubes and second heat exchange tubes, each first heat exchange tube being disposed between a second port and a fifth port; the second heat exchange tubes being disposed between the third port and the seventh port; The fourth port is connected to the seventh port; the sixth port is connected to the end of the second heat exchange tube furthest from the seventh port; a seventh on / off device is provided on the pipeline between the sixth port and the corresponding end of the second heat exchange tube; an eighth on / off device is provided on the pipeline between the third port and the corresponding end of the second heat exchange tube. The first port and the eighth port are the inlet of the heat exchanger and the outlet of the other heat exchanger.

[0010] Optionally, the heat exchanger is an outdoor heat exchanger, and the eighth port of the outdoor heat exchanger is connected to the indoor heat exchanger through a throttling device; When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to a first preset temperature value and the operating frequency is greater than a first preset value, the refrigerant flow path allows the refrigerant to directly enter the first number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to a first preset temperature value, and the operating frequency is less than or equal to the first preset value, the refrigerant flow path allows the refrigerant to directly enter the second number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes; the second number is greater than the first number; When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to the second preset temperature value and less than the first preset temperature value, and the operating frequency is greater than the first preset value, the refrigerant flow path allows the refrigerant to directly enter the third heat exchange tube through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to the second preset temperature value and less than the first preset temperature value, and the operating frequency is less than or equal to the first preset value, the refrigerant flow path allows the refrigerant to directly enter the first number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes; the first number is greater than the third number. When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to the third preset temperature value and less than the second preset temperature value, and the operating frequency is greater than the first preset value, the refrigerant flow path allows the refrigerant to directly enter the fourth heat exchange tube through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to a third preset temperature value and less than a second preset temperature value, and the operating frequency is less than or equal to a first preset value, the refrigerant flow path allows the refrigerant to directly enter the third number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes; the third number is greater than the fourth number; When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to the fourth preset temperature value and less than the third preset temperature value, and the operating frequency is greater than the first preset value, the refrigerant flow path allows the refrigerant to directly enter the third heat exchange tube through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to the fourth preset temperature value and less than the third preset temperature value, and the operating frequency is less than or equal to the first preset value, the refrigerant flow path allows the refrigerant to directly enter the first number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and when the outdoor ambient temperature is less than the fourth preset temperature value and the operating frequency is greater than the first preset value, the refrigerant flow path allows the refrigerant to directly enter the first number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and when the outdoor ambient temperature is less than the fourth preset temperature value and the operating frequency is less than or equal to the first preset value, the refrigerant flow path allows the refrigerant to directly enter the second number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes. Among them, the first preset temperature value > the second preset temperature value > the third preset temperature value > the fourth preset temperature value.

[0011] Optionally, when the air conditioner is heating, and when the outdoor ambient temperature is greater than or equal to a fifth preset temperature value and the operating frequency is greater than a second preset value, the refrigerant flow path allows the refrigerant to directly enter the fifth heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is in heating mode, and when the outdoor ambient temperature is greater than or equal to the fifth preset temperature value and the operating frequency is less than or equal to the second preset value, the refrigerant flow path allows the refrigerant to directly enter the sixth heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes; the fifth number is less than the sixth number; When the air conditioner is in heating mode, and when the outdoor ambient temperature is greater than or equal to the sixth preset temperature and less than the fifth preset temperature, and the operating frequency is greater than the second preset value, the refrigerant flow path allows the refrigerant to directly enter the seventh heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes; the seventh number is greater than the sixth number; When the air conditioner is heating, and when the outdoor ambient temperature is greater than or equal to the sixth preset temperature and less than the fifth preset temperature, and the operating frequency is less than or equal to the second preset value, the refrigerant flow path allows the refrigerant to directly enter the fifth heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is in heating mode, and when the outdoor ambient temperature is less than the sixth preset temperature value and the operating frequency is greater than the second preset value, the refrigerant flow path allows the refrigerant to directly enter the eighth heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes; the eighth number is greater than the seventh number; When the air conditioner is heating, and when the outdoor ambient temperature is less than the sixth preset temperature value and the operating frequency is less than or equal to the second preset value, the refrigerant flow path allows the refrigerant to directly enter the seventh heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes. Among them, the fifth preset temperature value is greater than the sixth preset temperature value.

[0012] Optionally, the number of the second port is four, the number of the fifth port is four, and the number of the first heat exchange tubes is four; The plurality of first switching devices are a first control valve, a second control valve and a third control valve arranged sequentially along the extension direction of the first pipe; The plurality of fourth switching devices are respectively a fourth control valve, a fifth control valve and a sixth control valve arranged sequentially along the extension direction of the second pipe.

[0013] Optionally, a plurality of the first heat exchange tubes and the second heat exchange tubes are arranged sequentially along the length or width direction of the heat exchanger; Multiple first heat exchange tubes and second heat exchange tubes are arranged sequentially in a vertical direction, with the second heat exchange tubes located below the multiple first heat exchange tubes.

[0014] In the energy-saving control method of the air conditioner of the present invention, the air conditioner has a first control mode and a second control mode. When the air conditioner enters the second control mode, a lower second operating frequency is first determined based on the compressor operating frequency in the first control mode, and energy saving is achieved by adjusting the compressor power to the second operating frequency. Furthermore, the air conditioner determines the first target refrigerant flow path corresponding to the heat exchanger based on the outdoor ambient temperature and the second operating frequency, and controls the heat exchanger to switch to the first target refrigerant flow path. By adjusting the refrigerant flow path, precise control of the effective heat exchange area and flow resistance of the heat exchanger is achieved, thereby effectively compensating for the heat exchange capacity loss caused by the compressor frequency reduction. Therefore, after the compressor power is reduced, the overall heat exchange capacity of the air conditioner can still be rematched with the current outdoor environmental conditions and compressor operating frequency. This energy-saving control method does not rely on increasing the fan speed to compensate for the heat exchange capacity, thus avoiding the additional energy consumption and operating noise. In summary, the present invention can significantly improve system energy efficiency while maintaining the required cooling / heating effect as much as possible, ensuring that users can still obtain a stable comfort experience in energy-saving mode.

[0015] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0016] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic flowchart of an energy-saving control method for an air conditioner according to an embodiment of the present invention; Figure 2 This is a schematic flowchart of an energy-saving control method for an air conditioner according to an embodiment of the present invention; Figure 3 This is a schematic flowchart of an energy-saving control method for an air conditioner according to an embodiment of the present invention; Figure 4 This is a schematic flowchart of an energy-saving control method for an air conditioner according to an embodiment of the present invention; Figure 5 This is a schematic structural diagram of a heat exchanger in an air conditioner according to an embodiment of the present invention; Figure 6 This is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, when the outdoor heat exchanger is split into multiple streams in cooling mode; Figure 7 This is a schematic structural diagram of an air conditioner in cooling mode with two-way splitting of the outdoor heat exchanger according to an embodiment of the present invention; Figure 8 This is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which the outdoor heat exchanger is split into three streams in cooling mode; Figure 9 This is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, when the outdoor heat exchanger is split into four streams in cooling mode; Figure 10 This is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which the outdoor heat exchanger is split into five streams in cooling mode. Detailed Implementation

[0017] The following reference Figures 1 to 10This invention describes an energy-saving control method for an air conditioner according to an embodiment of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0018] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0021] Figure 1 This is a schematic flowchart of an energy-saving control method for an air conditioner according to an embodiment of the present invention, such as... Figure 1 As shown, and refer to Figures 2 to 10 This invention provides an energy-saving control method for an air conditioner. The air conditioner includes a compressor and a heat exchanger; the air conditioner has a first control mode and a second control mode.

[0022] Energy-saving control methods for air conditioners generally include the following steps: Step S100: Obtain the outdoor ambient temperature; Step S200: Determine whether it is necessary to enter the second control mode; if so, execute S300. Step S300: Obtain the operating frequency of the compressor in the first control mode to obtain the first operating frequency; Step S400: Determine the operating frequency of the compressor in the second control mode based on the first operating frequency to obtain the second operating frequency; the second operating frequency is less than the first operating frequency. Step S500: Determine the first target refrigerant flow path in the heat exchanger based on the outdoor ambient temperature and the second operating frequency, so that the refrigerant flow path in the heat exchanger corresponds to the outdoor ambient temperature and the compressor operating frequency. In step S600, the compressor is operated at the second operating frequency, and the refrigerant flow path in the heat exchanger is the first target refrigerant flow path.

[0023] Specifically, the heat exchanger described in this embodiment is a heat exchanger with a variable internal refrigerant flow path, which can be adjusted and controlled by corresponding valves. This heat exchanger can be an outdoor heat exchanger and / or an indoor heat exchanger; that is, in this embodiment, the refrigerant flow path within the outdoor heat exchanger or the indoor heat exchanger can be adjusted individually, or both can be adjusted simultaneously.

[0024] The first operating frequency refers to the operating frequency of the compressor when the air conditioner is operating in the first control mode under the current operating conditions. The second operating frequency refers to the operating frequency of the air conditioner when it is operating in the second control mode under the same current operating conditions.

[0025] In this embodiment, the air conditioner has a first control mode (normal mode) and a second control mode (energy-saving mode). When the air conditioner enters the second control mode, it first determines a lower second operating frequency based on the compressor operating frequency (first operating frequency) in the first control mode, and then adjusts the compressor power to this second operating frequency to achieve energy saving. Furthermore, the air conditioner determines the first target refrigerant flow path (which is the optimal refrigerant flow path under the current operating conditions) corresponding to the heat exchanger based on the outdoor ambient temperature and the second operating frequency, and controls the heat exchanger to switch to the first target refrigerant flow path. By adjusting the refrigerant flow path, precise control of the effective heat exchange area and flow resistance of the heat exchanger is achieved, thereby effectively compensating for the heat exchange capacity loss caused by the compressor frequency reduction. Therefore, even after the compressor power is reduced, the overall heat exchange capacity of the air conditioner can still be rematched with the current outdoor environmental conditions and the compressor operating frequency. This energy-saving control method does not rely on increasing the fan speed to compensate for the heat exchange capacity, thus avoiding the additional energy consumption and operating noise resulting from it. In summary, this invention can significantly improve system energy efficiency while maintaining the required cooling / heating effect as much as possible, ensuring that users can still obtain a stable and comfortable experience in energy-saving mode.

[0026] like Figure 2 As shown, in some embodiments of the present invention, determining the operating frequency of the compressor in the second control mode based on the first operating frequency includes: Step S410: Determine the energy saving ratio based on the outdoor ambient temperature; Step S420: Determine the frequency adjustment coefficient based on the indoor target temperature, energy saving ratio, and outdoor ambient temperature; Step S430: Determine the second operating frequency based on the frequency adjustment coefficient and the operating frequency of the compressor in the first control mode.

[0027] Specifically, in step S410, an energy-saving ratio mapping table corresponding to different outdoor ambient temperatures can be pre-stored in the air conditioner, and the energy-saving ratio can be obtained by looking up the table; alternatively, the energy-saving ratio can be obtained by using a relational method based on a preset formula.

[0028] This embodiment can dynamically and precisely determine the second operating frequency of the compressor based on real-time operating conditions, so that the output capacity of the air conditioner in the second control mode (energy-saving mode) can match the current environmental load and ensure that the user's preset energy-saving target is achieved, thereby achieving precise energy efficiency maximization while maintaining good comfort.

[0029] In some embodiments of the present invention, in step S420, the energy-saving ratio is determined by a lookup table method, and the preset mapping relationship is as follows: When the outdoor ambient temperature is >48℃, or when the outdoor ambient temperature is <-5℃, the energy saving rate is 0%.

[0030] When 43℃ < outdoor ambient temperature ≤ 48℃, or -5℃ < outdoor ambient temperature ≤ 0℃, the energy saving rate is 10%.

[0031] When 35℃ < outdoor ambient temperature ≤ 43℃, or 0℃ < outdoor ambient temperature ≤ 5℃, the energy saving rate is 20%.

[0032] When 27℃ < outdoor ambient temperature ≤ 35℃, or 5℃ < outdoor ambient temperature ≤ 10℃, the energy saving rate is 30%. When the outdoor ambient temperature is ≤27℃, or the outdoor ambient temperature is >10℃: Energy saving ratio = (1 - minimum allowable operating frequency of compressor / rated frequency of compressor) * 100%.

[0033] like Figure 3 As shown, in some embodiments of the present invention, determining the frequency adjustment coefficient based on the indoor target temperature, energy-saving ratio, and outdoor ambient temperature may specifically include the following steps: Step S421: Calculate the absolute value of the difference between the outdoor ambient temperature and the indoor target temperature; Step S422: Determine the adjustment ratio based on the energy saving ratio; the larger the adjustment ratio, the smaller the corresponding energy saving ratio. Step S423: Determine the frequency adjustment coefficient based on the absolute value of the difference and the adjustment ratio.

[0034] This embodiment provides a specific method for obtaining the frequency adjustment coefficient, which can quickly and accurately obtain the frequency adjustment coefficient.

[0035] Further, in step S422, the frequency adjustment coefficient can be calculated according to the following formula: Where F is the frequency adjustment coefficient, a is the first preset coefficient, b is the second preset coefficient, ΔT is the absolute value of the difference between the outdoor ambient temperature and the indoor target temperature, S is the energy saving ratio, and "1-S" is the adjustment ratio.

[0036] Furthermore, a and b are equipment characteristic coefficients. These two coefficients are used to establish a linear relationship between the temperature difference (ΔT) and the compressor's reference frequency. For example, when the air conditioner is operating in cooling mode, a can be 3 to 6 (e.g., 5), and b can be 18 to 22 (e.g., 20).

[0037] In step S430, the second operating frequency can be obtained by multiplying the first operating frequency by the frequency adjustment coefficient. It should be noted that if the calculated second operating frequency is greater than the first operating frequency, then the system will operate at the first operating frequency.

[0038] In some embodiments of the present invention, the decision to enter the second control mode is made based on the outdoor ambient temperature.

[0039] Specifically, when the detected outdoor ambient temperature meets the preset conditions, it is determined that the second control mode needs to be entered; otherwise, the air conditioner continues to operate in the first control mode (normal mode).

[0040] Preferably, the preset condition is that the outdoor ambient temperature is within the range where the system can operate efficiently and stably in an energy-saving mode. For example, it can be set that when the outdoor ambient temperature is higher than -5℃ and lower than 48℃, it is determined that the second control mode needs to be entered. This is because, under extreme conditions such as outdoor ambient temperature lower than -5℃ or higher than 48℃, the system needs to operate at full capacity to ensure the most basic cooling / heating effect, and it is not appropriate to enter an energy-saving mode that reduces capacity at this time.

[0041] By using the method described in this embodiment, it can be ensured that the air conditioner only activates energy-saving control under suitable outdoor environmental conditions. This achieves the energy-saving goal while ensuring system performance and user comfort under extreme weather conditions, and avoids the problem of insufficient system capacity caused by improper energy saving.

[0042] In some embodiments of the present invention, the second control mode is entered when a second control mode activation command is received from the remote control. That is, it is activated based on user commands.

[0043] In some embodiments of the present invention, the energy-saving control method for air conditioners further includes: Step S710: When the air conditioner is in the first control mode, obtain the operating frequency of the compressor in the first control mode to obtain the first operating frequency; Step S720: Based on the outdoor ambient temperature and the first operating frequency, determine the second target refrigerant flow path in the heat exchanger so that the refrigerant flow path in the heat exchanger corresponds to the outdoor ambient temperature and the compressor operating frequency; the second target refrigerant flow path is the optimal refrigerant flow path under the current operating conditions. In step S730, the compressor is operated at the first operating frequency, and the refrigerant flow path in the heat exchanger is the second target refrigerant flow path.

[0044] In this embodiment, when the air conditioner is in the first control mode, the refrigerant flow path is adaptively optimized and switched according to the outdoor ambient temperature and the first operating frequency, so that the heat exchanger's heat exchange efficiency is optimally matched with the current outdoor ambient temperature and system load. This method can improve the overall energy efficiency of the system, thereby achieving energy saving, while ensuring the user's comfort experience.

[0045] like Figure 5 As shown, in some embodiments of the present invention, the heat exchanger 1 is an indoor heat exchanger or an outdoor heat exchanger.

[0046] Heat exchanger 1 includes a first tube 10, a second tube 20, and multiple heat exchange tubes. The multiple heat exchange tubes include multiple first heat exchange tubes 30 and multiple second heat exchange tubes 40.

[0047] The first pipe 10 has a first port 11, multiple second ports 12, a third port 13, and a fourth port 14 arranged sequentially along its extension direction; a first switching device is provided between every two adjacent second ports 12, a second switching device 52 is provided between the last second port 12 and the third port 13, and a third switching device 53 is provided between the third port 13 and the fourth port 14. The second pipe 20 has multiple fifth ports 21, a sixth port 22, a seventh port 23, and an eighth port 24 arranged sequentially along its extension direction; a fourth switching device is provided between every two adjacent fifth ports 21; a fifth switching device 55 is provided between the last fifth port 21 and the sixth port 22, and a sixth switching device 56 is provided between the sixth port 22 and the seventh port 23. Each first heat exchange tube 30 is disposed between a second port 12 and a fifth port 21; a second heat exchange tube 40 is disposed between a third port 13 and a seventh port 23; a fourth port 14 is connected to a seventh port 23; a sixth port 22 is connected to the end of the second heat exchange tube 40 furthest from the seventh port 23; a seventh on / off device 57 is disposed on the pipe between the sixth port 22 and the corresponding end of the second heat exchange tube 40; an eighth on / off device 58 is disposed on the pipe between the third port 13 and the corresponding end of the second heat exchange tube. The first port 11 and the eighth port 24 are the inlet of one heat exchanger 1 and the outlet of the other heat exchanger 1.

[0048] Specifically, the heat exchanger 1 in this embodiment can be either an indoor heat exchanger 1 or an outdoor heat exchanger 1. For example, when it is used as an outdoor heat exchanger 1: during the cooling operation of the air conditioner, the first port 11 is the inlet of the heat exchanger 1, which is connected to a high-temperature and high-pressure gaseous refrigerant, and the eighth port 24 is the outlet of the heat exchanger 1; during the heating operation of the air conditioner, the refrigerant flows in reverse, the eighth port 24 is the inlet of the heat exchanger 1, and the first port 11 is the outlet of the heat exchanger 1.

[0049] In this embodiment, the heat exchanger 1 operates as follows: by controlling the opening and closing combinations of the first to eighth on / off devices 58, the flow path of the refrigerant inside the heat exchanger 1 can be altered. For example, under high-temperature and high-load conditions, the refrigerant flows parallel through each of the first heat exchange tubes 30 and the second heat exchange tubes 40 via the heat exchanger inlet to maximize the heat exchange area and heat dissipation capacity. Under low-temperature and low-load conditions, more on / off devices can be closed to optimize the refrigerant flow rate and distribution.

[0050] This embodiment, by setting up a first pipe 10, a second pipe 20, multiple first heat exchange pipes 30 and second heat exchange pipes 40, and multiple on / off devices, can achieve flexible switching of the refrigerant flow path. This allows the heat exchanger 1 to select the optimal flow path according to real-time operating conditions (such as outdoor ambient temperature and compressor frequency), thereby improving heat exchange efficiency, reducing system energy consumption, and significantly enhancing the air conditioner's adaptability to complex and changing environments across the entire operating range.

[0051] In some alternative embodiments of the present invention, the first on / off device, the second on / off device 52, the third on / off device 53, the fourth on / off device, the fifth on / off device 55, the sixth on / off device 56, the seventh on / off device 57 and the eighth on / off device 58 are configured to be opened or closed in a controlled manner to switch the refrigerant flow path in the heat exchanger 1.

[0052] The first on / off device, the second on / off device 52, the third on / off device 53, the fourth on / off device, the fifth on / off device 55, the sixth on / off device 56, the seventh on / off device 57, and the eighth on / off device 58 are all solenoid valves.

[0053] Specifically, each of the above-mentioned solenoid valves is electrically connected to the main controller of the air conditioner and receives control signals from it, thereby opening or closing independently and in a controlled manner.

[0054] In this embodiment, the use of a solenoid valve as the on / off device facilitates precise, rapid, and automated control of the refrigerant flow path. The high response speed of the solenoid valve ensures that the flow path switching can promptly follow changes in operating conditions; its high reliability guarantees the long-term stability of the air conditioner's operation.

[0055] In some optional embodiments of the present invention, there are four second ports 12 and four fifth ports 21; there are four first heat exchange tubes 30. The plurality of first on / off devices are a first control valve 511, a second control valve 512, and a third control valve 513 arranged sequentially along the extension direction of the first tube 10. The plurality of fourth on / off devices are a fourth control valve 541, a fifth control valve 542, and a sixth control valve 543 arranged sequentially along the extension direction of the second tube 20.

[0056] In this embodiment, the refrigerant flow path of the outdoor heat exchanger includes at least the following: Figures 6 to 10 The situation shown is as follows: where, Figure 6 The corresponding refrigerant flow path is as follows: the refrigerant enters a heat exchange tube directly through the first port, and then flows through all the heat exchange tubes. Figure 7 The corresponding refrigerant flow path is as follows: the refrigerant enters directly into the two heat exchange tubes through the first port, and then flows through all the heat exchange tubes. Figure 8 The corresponding refrigerant flow path is as follows: the refrigerant enters directly into the three heat exchange tubes through the first port, and then flows through all the heat exchange tubes. Figure 9The corresponding refrigerant flow path is as follows: the refrigerant enters directly into the four heat exchange tubes through the first port, and then flows through all the heat exchange tubes. Figure 10 The corresponding refrigerant flow path is as follows: the refrigerant enters directly into the five heat exchange tubes through the first port, and then flows through all the heat exchange tubes.

[0057] The configuration of the four first heat exchange tubes 30 and related control valves in this embodiment is only an exemplary implementation. Their quantity and arrangement are not the only limitations on the present invention, and those skilled in the art can make adaptive adjustments according to the needs of actual application scenarios. For example, in alternative embodiments, the number of first heat exchange tubes 30 may also be 2, 3, 5, 6, 7, 8, 9, 10, or more.

[0058] In some optional embodiments of the present invention, the heat exchanger 1 is an outdoor heat exchanger 1. The air conditioner also includes an indoor heat exchanger 1; the eighth port 24 is connected to the indoor heat exchanger 1 through a throttling device; the air conditioner has a cooling mode and a heating mode.

[0059] Specifically, in cooling mode, the refrigerant flow of the air conditioner's refrigerant system is as follows: compressor → four-way valve → outdoor heat exchanger 1 (which acts as a condenser, with port 11 as the inlet and port 24 as the outlet) → throttling device → indoor heat exchanger 1 (which acts as an evaporator) → four-way valve → back to compressor.

[0060] In heating mode, the four-way valve switches, and the refrigerant flow reverses: compressor → four-way valve → indoor heat exchanger 1 (as condenser) → throttling device → outdoor heat exchanger 1 (as evaporator at this time, with port 24 as the inlet and port 11 as the outlet) → four-way valve → back to compressor.

[0061] In some optional embodiments of the present invention, a plurality of first heat exchange tubes 30 and second heat exchange tubes 40 are arranged sequentially along the length or width direction of the heat exchanger 1. The plurality of first heat exchange tubes 30 and second heat exchange tubes 40 are arranged sequentially in the vertical direction, and the second heat exchange tubes 40 are disposed below the plurality of first heat exchange tubes 30.

[0062] This embodiment optimizes the spatial layout of heat exchanger 1, which helps to improve the uniformity of heat exchange and enhances the structural compactness, making it suitable for various installation environments.

[0063] In some optional embodiments of the present invention, the heat exchanger is an outdoor heat exchanger, and the eighth port of the outdoor heat exchanger is connected to the indoor heat exchanger through a throttling device.

[0064] When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the first preset temperature value and the operating frequency is greater than the first preset value, the refrigerant flow path allows the refrigerant to directly enter the first number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the first preset temperature value, and the operating frequency is less than or equal to the first preset value, the refrigerant flow path allows the refrigerant to directly enter the second number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes; the second number is greater than the first number; When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the second preset temperature value and less than the first preset temperature value, and the operating frequency is greater than the first preset value, the refrigerant flow path allows the refrigerant to directly enter the third heat exchange tube through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the second preset temperature value and less than the first preset temperature value, and the operating frequency is less than or equal to the first preset value, the refrigerant flow path allows the refrigerant to directly enter the first number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes; the first number is greater than the third number; When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the third preset temperature value and less than the second preset temperature value, and the operating frequency is greater than the first preset value, the refrigerant flow path allows the refrigerant to directly enter the fourth heat exchange tube through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the third preset temperature value and less than the second preset temperature value, and the operating frequency is less than or equal to the first preset value, the refrigerant flow path allows the refrigerant to directly enter the third number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes; the third number is greater than the fourth number; When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the fourth preset temperature value and less than the third preset temperature value, and the operating frequency is greater than the first preset value, the refrigerant flow path allows the refrigerant to directly enter the third heat exchange tube through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the fourth preset temperature value and less than the third preset temperature value, and the operating frequency is less than or equal to the first preset value, the refrigerant flow path allows the refrigerant to directly enter the first number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and the outdoor ambient temperature is less than the fourth preset temperature value and the operating frequency is greater than the first preset value, the refrigerant flow path allows the refrigerant to directly enter the first number of heat exchange tubes through the first port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is cooling, and the outdoor ambient temperature is less than the fourth preset temperature value and the operating frequency is less than or equal to the first preset value, the refrigerant flow path allows the refrigerant to directly enter the second heat exchange tube through the first port, and allows the refrigerant to flow through all the heat exchange tubes.

[0065] Among them, the first preset temperature value > the second preset temperature value > the third preset temperature value > the fourth preset temperature value.

[0066] In some optional embodiments of the present invention, when the air conditioner is heating, and when the outdoor ambient temperature is greater than or equal to the fifth preset temperature value and the operating frequency is greater than the second preset value, the refrigerant flow path allows the refrigerant to directly enter the fifth heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the fifth preset temperature value, and the operating frequency is less than or equal to the second preset value, the refrigerant flow path allows the refrigerant to directly enter the sixth heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes; the fifth number is less than the sixth number; When the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the sixth preset temperature and less than the fifth preset temperature, and the operating frequency is greater than the second preset value, the refrigerant flow path allows the refrigerant to directly enter the seventh heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes; the seventh number is greater than the sixth number. When the air conditioner is heating, and the outdoor ambient temperature is greater than or equal to the sixth preset temperature and less than the fifth preset temperature, and the operating frequency is less than or equal to the second preset value, the refrigerant flow path allows the refrigerant to directly enter the fifth heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes. When the air conditioner is in heating mode, and the outdoor ambient temperature is lower than the sixth preset temperature value and the operating frequency is higher than the second preset value, the refrigerant flow path allows the refrigerant to directly enter the eighth heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes; the eighth number is greater than the seventh number. When the air conditioner is heating, and the outdoor ambient temperature is less than the sixth preset temperature value and the operating frequency is less than or equal to the second preset value, the refrigerant flow path allows the refrigerant to directly enter the seventh heat exchange tube through the eighth port, and allows the refrigerant to flow through all the heat exchange tubes. Among them, the fifth preset temperature value is greater than the sixth preset temperature value.

[0067] Further, in some optional embodiments of the present invention, the number of second ports 12 is four, the number of fifth ports 21 is four, and the number of first heat exchange tubes 30 is four. Multiple first on / off devices are respectively a first control valve 511, a second control valve 512, and a third control valve 513 arranged sequentially along the extension direction of the first tube 10. Multiple fourth on / off devices are respectively a fourth control valve 541, a fifth control valve 542, and a sixth control valve 543 arranged sequentially along the extension direction of the second tube 20. The heat exchanger 1 is an outdoor heat exchanger 1.

[0068] When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the first preset temperature value, and the operating frequency is greater than the first preset value, the following controls are implemented: the first control valve 511, the second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the sixth control valve 543, the fifth on / off device 55, and the seventh on / off device 57 are all in the conducting state, while the second on / off device 52, the third on / off device 53, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the four heat exchange tubes through the first port, and the refrigerant flows through all the heat exchange tubes.

[0069] When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the first preset temperature value, and the operating frequency is less than or equal to the first preset value, the following controls are applied: First control valve 511, second control valve 512, third control valve 513, fourth control valve 541, fifth control valve 542, sixth control valve 543, second on / off device 52, fifth on / off device 55, seventh on / off device 57, and eighth on / off device 58 are all in the conducting state, and third on / off device 53 and sixth on / off device 56 are all in the disconnected state; or, First control valve 511, second control valve 512, third control valve 513, fourth control valve 541, fifth control valve 542, sixth control valve 543, second on / off device 52, fifth on / off device 55, sixth on / off device 56, and eighth on / off device 58 are all in the conducting state, and third on / off device 53 and seventh on / off device 57 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the five heat exchange tubes through the first inlet and to flow through all the heat exchange tubes.

[0070] When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the second preset temperature value but less than the first preset temperature value, and the operating frequency is greater than the first preset value, the following controls are applied: First control valve 511, second control valve 512, second on / off device 52, fourth control valve 541, fifth control valve 542, sixth control valve 543, and eighth on / off device 58 are all in the conducting state, and third control valve 513, third on / off device 53, fifth on / off device 55, sixth on / off device 56, and seventh on / off device 57 are all in the disconnected state; or, first control valve 511, second control valve 512, second on / off device 52, fourth control valve 541, fifth control valve 542, sixth control valve 543, third on / off device 53, fifth on / off device 55, and seventh on / off device 57 are all in the conducting state, and third control valve 513, sixth on / off device 56, and eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the three heat exchange tubes through the first inlet and to flow through all the heat exchange tubes.

[0071] When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the second preset temperature value but less than the first preset temperature value, and the operating frequency is less than or equal to the first preset value, the following controls are applied: First control valve 511, second control valve 512, third control valve 513, fourth control valve 541, fifth control valve 542, sixth control valve 543, fifth on / off device 55, and seventh on / off device 57 are all in the conducting state, while second on / off device 52, third on / off device 53, sixth on / off device 56, and eighth on / off device 58 are all in the off state. In other words, the refrigerant flow path allows the refrigerant to directly enter the four heat exchange tubes through the first port and flow through all the heat exchange tubes.

[0072] When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the third preset temperature value but less than the second preset temperature value, and the operating frequency is greater than the first preset value, control: The first control valve 511, the third control valve 513, the second on / off device 52, the fourth control valve 541, the fifth control valve 542, the sixth control valve 543, and the eighth on / off device 58 are all in the conducting state, while the second control valve 512, the third on / off device 53, the fifth on / off device 55, the sixth on / off device 56, and the seventh on / off device 57 are all in the off state. Alternatively, the first control valve 511, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the sixth control valve 543, the fifth on / off device 55, and the seventh on / off device 57 are all in the conducting state, while the second control valve 512, the second on / off device 52, the third on / off device 53, the sixth on / off device 56, and the eighth on / off device 58 are all in the off state. Alternatively, the first control valve 511, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the second on / off device 52, the fifth on / off device 55, the sixth on / off device 56, and the eighth on / off device 58 are all in the conducting state, while the second control valve 512, the sixth control valve 543, the third on / off device 53, and the seventh on / off device 57 are all in the off state. Alternatively, the first control valve 511, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the sixth control valve 543, the second on / off device 52, the fifth on / off device 55, the third on / off device 53, and the seventh on / off device 57 are all in the conducting state, while the second control valve 512, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the two heat exchange tubes through the first port and to flow through all the heat exchange tubes.

[0073] When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the third preset temperature value and less than the second preset temperature value, and the operating frequency is less than or equal to the first preset value, the following controls are applied: First control valve 511, second control valve 512, second on / off device 52, fourth control valve 541, fifth control valve 542, sixth control valve 543, and eighth on / off device 58 are all in the conducting state, while third control valve 513, third on / off device 53, fifth on / off device 55, sixth on / off device 56, and seventh on / off device 57 are all in the disconnected state; or, first control valve 511, second control valve 512, second on / off device 52, fourth control valve 541, fifth control valve 542, sixth control valve 543, third on / off device 53, fifth on / off device 55, and seventh on / off device 57 are all in the conducting state, while third control valve 513, sixth on / off device 56, and eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the three heat exchange tubes through the first inlet and to flow through all the heat exchange tubes.

[0074] When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the fourth preset temperature value and less than the third preset temperature value, and the operating frequency is greater than the first preset value, the following controls are applied: First control valve 511, second control valve 512, second on / off device 52, fourth control valve 541, fifth control valve 542, sixth control valve 543, and eighth on / off device 58 are all in the conducting state, and third control valve 513, third on / off device 53, fifth on / off device 55, sixth on / off device 56, and seventh on / off device 57 are all in the disconnected state; or, first control valve 511, second control valve 512, second on / off device 52, fourth control valve 541, fifth control valve 542, sixth control valve 543, third on / off device 53, fifth on / off device 55, and seventh on / off device 57 are all in the conducting state, and third control valve 513, sixth on / off device 56, and eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the three heat exchange tubes through the first inlet and to flow through all the heat exchange tubes.

[0075] When the air conditioner is cooling, and the outdoor ambient temperature is greater than or equal to the fourth preset temperature value but less than the third preset temperature value, and the operating frequency is less than or equal to the first preset value, the following controls are applied: First control valve 511, second control valve 512, third control valve 513, fourth control valve 541, fifth control valve 542, sixth control valve 543, fifth on / off device 55, and seventh on / off device 57 are all in the conducting state, while second on / off device 52, third on / off device 53, sixth on / off device 56, and eighth on / off device 58 are all in the off state. In other words, the refrigerant flow path allows the refrigerant to directly enter the four heat exchange tubes through the first port and flow through all the heat exchange tubes.

[0076] When the air conditioner is cooling, and the outdoor ambient temperature is lower than the fourth preset temperature value and the operating frequency is higher than the first preset value, the following controls are applied: First control valve 511, second control valve 512, third control valve 513, fourth control valve 541, fifth control valve 542, sixth control valve 543, fifth on / off device 55, and seventh on / off device 57 are all in the conducting state, while second on / off device 52, third on / off device 53, sixth on / off device 56, and eighth on / off device 58 are all in the off state. In other words, the refrigerant flow path allows the refrigerant to directly enter the four heat exchange tubes through the first port and flow through all the heat exchange tubes.

[0077] When the air conditioner is cooling, and the outdoor ambient temperature is less than the fourth preset temperature value and the operating frequency is less than or equal to the first preset value, the following controls are applied: First control valve 511, second control valve 512, third control valve 513, fourth control valve 541, fifth control valve 542, sixth control valve 543, second on / off device 52, fifth on / off device 55, seventh on / off device 57, and eighth on / off device 58 are all in the conducting state, and third on / off device 53 and sixth on / off device 56 are all in the disconnected state; or, First control valve 511, second control valve 512, third control valve 513, fourth control valve 541, fifth control valve 542, sixth control valve 543, second on / off device 52, fifth on / off device 55, sixth on / off device 56, and eighth on / off device 58 are all in the conducting state, and third on / off device 53 and seventh on / off device 57 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the five heat exchange tubes through the first inlet and to flow through all the heat exchange tubes.

[0078] When the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the fifth preset temperature value and the operating frequency is greater than the second preset value, the following controls are applied: the second control valve 512, the third control valve 513, the fourth control valve 541, the sixth control valve 543, the second on / off device 52, the fifth on / off device 55, the sixth on / off device 56, and the eighth on / off device 58 are all in the conducting state, and the first control valve 511, the fifth control valve 542, the third on / off device 53, and the seventh on / off device 57 are all in the disconnected state; or, the first control valve 511, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the sixth control valve 543, the second on / off device 52, the fifth on / off device 55, the third on / off device 53, and the seventh on / off device 57 are all in the conducting state, and the second control valve 512, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the three heat exchange tubes through the eighth port, and to flow through all the heat exchange tubes.

[0079] When the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the fifth preset temperature value, and the operating frequency is less than or equal to the second preset value, the following controls are applied: The first control valve 511, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the second on / off device 52, the fifth on / off device 55, the sixth on / off device 56, and the eighth on / off device 58 are all in the conducting state, while the second control valve 512, the sixth control valve 543, the third on / off device 53, and the seventh on / off device 57 are all in the off state; or The second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the second on / off device 52, the fifth on / off device 55, the sixth on / off device 56, and the eighth on / off device 58 are all in the conducting state, while the first control valve 511, the sixth control valve 543, the third on / off device 53, and the seventh on / off device 57 are all in the off state; or The second control valve 512, the fourth control valve 541, the sixth control valve 543, the second on / off device 52, the fifth on / off device 55, the third on / off device 53, and the seventh on / off device 57 are all in the conducting state, while the first control valve 511, the third control valve 513, the fifth control valve 542, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the two heat exchange tubes through the eighth port, and for the refrigerant to flow through all the heat exchange tubes.

[0080] When the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the sixth preset temperature but less than the fifth preset temperature, and the operating frequency is greater than the second preset value, the following controls are applied: the second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the second on / off device 52, the fifth on / off device 55, the third on / off device 53, and the seventh on / off device 57 are all in the conducting state, while the first control valve 511, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the four heat exchange tubes through the eighth port, and the refrigerant flows through all the heat exchange tubes.

[0081] When the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the sixth preset temperature and less than the fifth preset temperature, and the operating frequency is less than or equal to the second preset value, the following controls are applied: the second control valve 512, the third control valve 513, the fourth control valve 541, the sixth control valve 543, the second on / off device 52, the fifth on / off device 55, the sixth on / off device 56, and the eighth on / off device 58 are all in the conducting state, and the first control valve 511, the fifth control valve 542, the third on / off device 53, and the seventh on / off device 57 are all in the disconnected state; or, the first control valve 511, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the sixth control valve 543, the second on / off device 52, the fifth on / off device 55, the third on / off device 53, and the seventh on / off device 57 are all in the conducting state, and the second control valve 512, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the three heat exchange tubes through the eighth port, and to flow through all the heat exchange tubes.

[0082] When the air conditioner is in heating mode, and the outdoor ambient temperature is lower than the sixth preset temperature value while the operating frequency is higher than the second preset value, the following controls are applied: First control valve 511, second control valve 512, third control valve 513, fourth control valve 541, fifth control valve 542, sixth control valve 543, second on / off device 52, fifth on / off device 55, sixth on / off device 56, and eighth on / off device 58 are all in the conducting state, while third on / off device 53 and seventh on / off device 57 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the five heat exchange tubes through the eighth port, and the refrigerant flows through all the heat exchange tubes.

[0083] When the air conditioner is in heating mode, and the outdoor ambient temperature is lower than the sixth preset temperature value, and the operating frequency is less than or equal to the second preset value, the following controls are applied: the second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the second on / off device 52, the fifth on / off device 55, the third on / off device 53, and the seventh on / off device 57 are all in the conducting state, while the first control valve 511, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state. In other words, the refrigerant flow path allows the refrigerant to directly enter the four heat exchange tubes through the eighth port, and the refrigerant flows through all the heat exchange tubes.

[0084] Specifically, when the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the seventh preset temperature and less than the sixth preset temperature, and the operating frequency is greater than the second preset value, the following controls are implemented: the first control valve 511, the second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the sixth control valve 543, the second on / off device 52, the fifth on / off device 55, the sixth on / off device 56, and the eighth on / off device 58 are all in the conducting state, while the third on / off device 53 and the seventh on / off device 57 are all in the disconnected state.

[0085] When the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the seventh preset temperature and less than the sixth preset temperature, and the operating frequency is less than or equal to the second preset value, the following controls are applied: the second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the second on / off device 52, the fifth on / off device 55, the third on / off device 53, and the seventh on / off device 57 are all in the conducting state, while the first control valve 511, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state.

[0086] When the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the eighth preset temperature and less than the seventh preset temperature, and the operating frequency is greater than the second preset value, the following controls are applied: the first control valve 511, the second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the sixth control valve 543, the second on / off device 52, the fifth on / off device 55, the sixth on / off device 56, and the eighth on / off device 58 are all in the conducting state, and the third on / off device 53 and the seventh on / off device 57 are all in the disconnected state.

[0087] When the air conditioner is in heating mode, and the outdoor ambient temperature is greater than or equal to the eighth preset temperature and less than the seventh preset temperature, and the operating frequency is less than or equal to the second preset value, the following controls are applied: the second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the second on / off device 52, the fifth on / off device 55, the third on / off device 53, and the seventh on / off device 57 are all in the conducting state, while the first control valve 511, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state.

[0088] When the air conditioner is in heating mode, and the outdoor ambient temperature is lower than the eighth preset temperature and the operating frequency is higher than the second preset value, the following controls are applied: the first control valve 511, the second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the sixth control valve 543, the second on / off device 52, the fifth on / off device 55, the sixth on / off device 56, and the eighth on / off device 58 are all in the conducting state, while the third on / off device 53 and the seventh on / off device 57 are all in the disconnected state.

[0089] When the air conditioner is in heating mode, and the outdoor ambient temperature is lower than the eighth preset temperature and the operating frequency is less than or equal to the second preset value, the following controls are implemented: the second control valve 512, the third control valve 513, the fourth control valve 541, the fifth control valve 542, the second on / off device 52, the fifth on / off device 55, the third on / off device 53, and the seventh on / off device 57 are all in the conducting state, while the first control valve 511, the sixth on / off device 56, and the eighth on / off device 58 are all in the disconnected state.

[0090] Among them, the fifth preset temperature value > the sixth preset temperature value > the seventh preset temperature value > the eighth preset temperature value, and the second preset value > the first preset value.

[0091] The preset temperature and operating frequency values ​​mentioned above can be specifically set according to the air conditioner model. For example, the first preset temperature value can be 60℃, the second preset temperature value can be 42℃, the third preset temperature value can be 32℃, the fourth preset temperature value can be 22℃, the fifth preset temperature value can be 10℃, the sixth preset temperature value can be 0℃, the seventh preset temperature value can be -10℃, the eighth preset temperature value can be -20℃, the first preset frequency can be 70Hz, and the second preset frequency can be 90Hz.

[0092] In this embodiment, the variable flow path capability of heat exchanger 1 is precisely matched with the actual operating conditions of the air conditioner (cooling / heating mode, outdoor ambient temperature, compressor frequency), which enables intelligent and efficient switching of flow paths.

[0093] On the one hand, by pre-setting the optimal flow path mode for different temperature ranges and load levels (reflected by compressor frequency), heat exchanger 1 can operate at its most efficient state under any operating condition. Whether it is extreme high-temperature cooling or extreme low-temperature heating, the system can automatically select the most suitable flow path combination to maximize heat exchange efficiency and minimize unnecessary flow resistance, thereby significantly reducing the overall energy consumption of the system.

[0094] On the other hand, this control method covers a wide range from ultra-low temperatures (such as below -20°C) to ultra-high temperatures (such as above 60°C), ensuring that the air conditioner can maintain strong and stable performance even in harsh environments. For example, it prioritizes heat dissipation capacity when cooling at high temperatures, and optimizes the flow path to prevent frost formation and maintain efficient heat absorption when heating at low temperatures, greatly expanding the reliable operating range of the air conditioner.

[0095] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. An energy saving control method of an air conditioner, characterized by, The air conditioner comprises a compressor and a heat exchanger; The air conditioner has a first control mode and a second control mode; The energy-saving control method comprises: Obtaining an outdoor environment temperature; Determining whether to enter the second control mode; If yes, obtaining a running frequency of the compressor in the first control mode to obtain a first running frequency; Determining a running frequency of the compressor in the second control mode according to the first running frequency to obtain a second running frequency; the second running frequency is less than the first running frequency; According to the outdoor environment temperature and the second running frequency, determining a first target refrigerant flow path in the heat exchanger, so that the refrigerant flow path in the heat exchanger corresponds to the outdoor environment temperature and the running frequency of the compressor; Making the compressor run at the second running frequency and making the refrigerant flow path in the heat exchanger be the first target refrigerant flow path.

2. The energy-saving control method according to claim 1, wherein determining a running frequency of the compressor in the second control mode according to the first running frequency comprises: Determining an energy-saving ratio according to the outdoor environment temperature, Determining a frequency adjustment coefficient according to an indoor target temperature, the energy-saving ratio and the outdoor environment temperature; Determining the second running frequency according to the frequency adjustment coefficient and the running frequency of the compressor in the first control mode.

3. The energy-saving control method according to claim 2, wherein determining a frequency adjustment coefficient according to an indoor target temperature, the energy-saving ratio and the outdoor environment temperature comprises: Calculating an absolute value of a difference between the outdoor environment temperature and the indoor target temperature; Determining an adjustment ratio according to the energy-saving ratio; the greater the adjustment ratio is, the smaller the corresponding energy-saving ratio is; Determining the frequency adjustment coefficient according to the absolute value of the difference and the adjustment ratio.

4. The energy-saving control method according to claim 1, wherein determining whether to enter the second control mode according to the outdoor environment temperature. Further comprising: When the air conditioner is in the first control mode, obtaining a running frequency of the compressor in the first control mode to obtain a first running frequency; According to the outdoor environment temperature and the first running frequency, determining a second target refrigerant flow path in the heat exchanger, so that the refrigerant flow path in the heat exchanger corresponds to the outdoor environment temperature and the running frequency of the compressor; 5. The energy saving control method according to claim 1, characterized by, Making the compressor run at the first running frequency and making the refrigerant flow path in the heat exchanger be the second target refrigerant flow path.

6. The energy-saving control method according to claim 5, wherein the heat exchanger is an indoor heat exchanger or an outdoor heat exchanger; The heat exchanger comprises: A first pipe, the first pipe is sequentially provided with a first port, a plurality of second ports, a third port and a fourth port along the extension direction of the first pipe; a first on-off device is arranged between every two adjacent second ports, a second on-off device is arranged between the last second port and the third port, and a third on-off device is arranged between the third port and the fourth port; ​ ​ ​ ​ A second pipe, a plurality of fifth ports, a sixth port, a seventh port and an eighth port are sequentially arranged on the second pipe along the extension direction of the second pipe; a fourth on-off device is arranged between every two adjacent fifth ports; a fifth on-off device is arranged between the last fifth port and the sixth port, and a sixth on-off device is arranged between the sixth port and the seventh port; A plurality of heat exchange pipes, including a plurality of first heat exchange pipes and second heat exchange pipes, each first heat exchange pipe is arranged between one second port and one fifth port; the second heat exchange pipe is arranged between the third port and the seventh port; The fourth port is in communication with the seventh port; the sixth port and one end of the second heat exchange pipe away from the seventh port are in communication; a seventh on-off device is arranged on the pipeline between the sixth port and the corresponding end of the second heat exchange pipe; an eighth on-off device is arranged on the pipeline between the third port and the corresponding end of the second heat exchange pipe; One of the first port and the eighth port is the inlet of one of the heat exchangers, and the other is the outlet of the other heat exchanger.

7. The energy-saving control method according to claim 6, wherein, The heat exchanger is an outdoor heat exchanger, and the eighth port of the outdoor heat exchanger is in communication with the indoor heat exchanger through a throttling device; When the air conditioner is in cooling mode, and when the outdoor environment temperature is greater than or equal to a first preset temperature value and the operating frequency is greater than a first preset value, the refrigerant flow path causes the refrigerant to directly enter a first number of the heat exchange pipes through the first port and flow through all the heat exchange pipes; When the air conditioner is in cooling mode, and when the outdoor environment temperature is greater than or equal to a first preset temperature value and the operating frequency is less than or equal to the first preset value, the refrigerant flow path causes the refrigerant to directly enter a second number of the heat exchange pipes through the first port and flow through all the heat exchange pipes; the second number is greater than the first number; When the air conditioner is in cooling mode, and when the outdoor environment temperature is greater than or equal to a second preset temperature value and less than the first preset temperature value, and the operating frequency is greater than the first preset value, the refrigerant flow path causes the refrigerant to directly enter a third number of the heat exchange pipes through the first port and flow through all the heat exchange pipes; When the air conditioner is in cooling mode, and when the outdoor environment temperature is greater than or equal to a second preset temperature value and less than the first preset temperature value, and the operating frequency is less than or equal to the first preset value, the refrigerant flow path causes the refrigerant to directly enter a first number of the heat exchange pipes through the first port and flow through all the heat exchange pipes; the first number is greater than the third number; When the air conditioner is in cooling mode, and when the outdoor environment temperature is greater than or equal to a third preset temperature value and less than the second preset temperature value, and the operating frequency is greater than the first preset value, the refrigerant flow path causes the refrigerant to directly enter a fourth number of the heat exchange pipes through the first port and flow through all the heat exchange pipes; When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to a third preset temperature value and less than a second preset temperature value, and when the operating frequency is less than or equal to a first preset value, the refrigerant flow path causes the refrigerant to directly enter a third number of the heat exchange tubes through the first port and flow through all of the heat exchange tubes; the third number is greater than the fourth number; When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to a fourth preset temperature value and less than a third preset temperature value, and when the operating frequency is greater than the first preset value, the refrigerant flow path causes the refrigerant to directly enter a third number of the heat exchange tubes through the first port and flow through all of the heat exchange tubes; When the air conditioner is cooling, and when the outdoor ambient temperature is greater than or equal to a fourth preset temperature value and less than a third preset temperature value, and when the operating frequency is less than or equal to a first preset value, the refrigerant flow path causes the refrigerant to directly enter a first number of the heat exchange tubes through the first port and flow through all of the heat exchange tubes; When the air conditioner is cooling, and when the outdoor ambient temperature is less than the fourth preset temperature value, and when the operating frequency is greater than the first preset value, the refrigerant flow path causes the refrigerant to directly enter a first number of the heat exchange tubes through the first port and flow through all of the heat exchange tubes; When the air conditioner is cooling, and when the outdoor ambient temperature is less than the fourth preset temperature value, and when the operating frequency is less than or equal to the first preset value, the refrigerant flow path causes the refrigerant to directly enter a second number of the heat exchange tubes through the first port and flow through all of the heat exchange tubes; wherein the first preset temperature value > the second preset temperature value > the third preset temperature value > the fourth preset temperature value.

8. The energy-saving control method according to claim 7, wherein, when the air conditioner is heating, and when the outdoor ambient temperature is greater than or equal to a fifth preset temperature value, and when the operating frequency is greater than a second preset value, the refrigerant flow path causes the refrigerant to directly enter a fifth number of the heat exchange tubes through the eighth port and flow through all of the heat exchange tubes; When the air conditioner is heating, and when the outdoor ambient temperature is greater than or equal to a fifth preset temperature value, and when the operating frequency is less than or equal to a second preset value, the refrigerant flow path causes the refrigerant to directly enter a sixth number of the heat exchange tubes through the eighth port and flow through all of the heat exchange tubes; the fifth number is less than the sixth number; When the air conditioner is heating, and when the outdoor ambient temperature is greater than or equal to a sixth preset temperature value and less than a fifth preset temperature value, and when the operating frequency is greater than the second preset value, the refrigerant flow path causes the refrigerant to directly enter a seventh number of the heat exchange tubes through the eighth port and flow through all of the heat exchange tubes; the seventh number is greater than the sixth number; ​ When the air conditioner is heating, and when the outdoor ambient temperature is greater than or equal to a sixth preset temperature value and less than a fifth preset temperature value, and when the operating frequency is less than or equal to a second preset value, the refrigerant flow path causes the refrigerant to directly enter a fifth number of the heat exchange tubes through the eighth port and flow through all of the heat exchange tubes; When the air conditioner is heating, and when the outdoor ambient temperature is less than the sixth preset temperature value, and when the operating frequency is greater than the second preset value, the refrigerant flow path causes the refrigerant to directly enter an eighth number of the heat exchange tubes through the eighth port and flow through all of the heat exchange tubes; the eighth number is greater than the seventh number; When the air conditioner is heating, and when the outdoor ambient temperature is less than the sixth preset temperature value, and when the operating frequency is less than or equal to the second preset value, the refrigerant flow path causes the refrigerant to directly enter a seventh number of the heat exchange tubes through the eighth port and flow through all of the heat exchange tubes; Wherein, the fifth preset temperature value > the sixth preset temperature value.

9. The energy-saving control method according to claim 6, wherein the number of the second ports is four, and the number of the fifth ports is four; the first heat exchange tubes are four. The first on-off devices are a first control valve, a second control valve, and a third control valve arranged in sequence along the extension direction of the first tubes. The fourth on-off devices are a fourth control valve, a fifth control valve, and a sixth control valve arranged in sequence along the extension direction of the second tubes.

10. The energy-saving control method according to claim 6, wherein the first heat exchange tubes and the second heat exchange tubes are arranged in sequence along the length direction or the width direction of the heat exchanger. The first heat exchange tubes and the second heat exchange tubes are arranged in sequence in the up-down direction, and the second heat exchange tubes are arranged on the lower side of the first heat exchange tubes. ​ ​

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