Constant-temperature dehumidification control method of air conditioner

Abstract

The invention provides a constant-temperature dehumidification control method of an air conditioner. The air conditioner comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger and a throttling device. The control method comprises the steps that whether constant-temperature dehumidification is needed or not is judged; if yes, the indoor dew point temperature is obtained; the operation frequency of a compressor is determined according to the indoor dew point temperature; acquiring the outdoor environment temperature; according to the outdoor environment temperature and the operation frequency of the compressor, a target refrigerant flow path in the outdoor heat exchanger is determined, so that the refrigerant flow path in the outdoor heat exchanger corresponds to the outdoor environment temperature and the operation frequency of the compressor; and the compressor is adjusted according to the determined compressor operation frequency, and a refrigerant flow path of the outdoor heat exchanger is made to be the target refrigerant flow path. By the adoption of the control method, the air conditioner can continuously and efficiently dehumidify, meanwhile, room temperature reduction caused by excessive refrigeration is effectively restrained, and finally the balance of constant temperature and dehumidification is achieved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a constant temperature and dehumidification control method for an air conditioner. Background Technology

[0002] Air conditioners are widely used in daily life to regulate the temperature and humidity of indoor environments. In hot and humid weather, users usually need both cooling and dehumidification. During the cooling process, when indoor air flows through a low-temperature indoor heat exchanger, water vapor in the air condenses into water, thus achieving a dehumidification effect. However, existing air conditioners tend to lower the room temperature while dehumidifying. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a constant temperature dehumidification control method for an air conditioner that overcomes or at least partially solves the above problems. This method can solve the problem that existing air conditioners cannot maintain a constant indoor temperature while effectively dehumidifying, thereby improving the user experience.

[0004] Specifically, the present invention provides a constant temperature and dehumidification control method for an air conditioner, the air conditioner including a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a throttling device; The constant temperature and dehumidification control method includes: Determine whether constant temperature dehumidification is needed; If so, obtain the indoor dew point temperature; The operating frequency of the compressor is determined based on the indoor dew point temperature; Obtain the outdoor ambient temperature; Based on the outdoor ambient temperature and the operating frequency of the compressor, the target refrigerant flow path in the outdoor heat exchanger is determined so that the refrigerant flow path in the outdoor heat exchanger corresponds to the outdoor ambient temperature and the operating frequency of the compressor. The compressor is adjusted according to the determined operating frequency, and the refrigerant flow path of the outdoor heat exchanger is aligned with the target refrigerant flow path.

[0005] Optionally, determining the operating frequency of the compressor based on the indoor dew point temperature includes: The target indoor temperature, the indoor ambient temperature, and the temperature of the indoor heat exchanger are obtained. The change in the operating frequency of the compressor is determined based on the indoor target temperature, the indoor dew point temperature, the temperature of the indoor heat exchanger, and the indoor ambient temperature. The operating frequency of the compressor is determined based on the change.

[0006] Optionally, the constant temperature and dehumidification control method further includes: When the temperature of the indoor heat exchanger is greater than or equal to the indoor dew point temperature, the compressor is adjusted according to the determined operating frequency of the compressor. When the temperature of the indoor heat exchanger is lower than the indoor dew point temperature, and the difference between the indoor dew point temperature and the temperature of the indoor heat exchanger is greater than a preset difference, the compressor is adjusted according to the determined operating frequency of the compressor.

[0007] Optionally, the constant temperature and dehumidification control method further includes: When the compressor is adjusted according to the determined operating frequency of the compressor to increase the operating frequency of the compressor, the opening degree of the throttling device is increased.

[0008] Optionally, the constant temperature and dehumidification control method further includes: When the compressor is adjusted according to the determined operating frequency of the compressor to reduce the operating frequency of the compressor, the opening degree of the throttling device is reduced.

[0009] Optionally, the constant temperature and dehumidification control method further includes: The opening degree or change in opening degree of the throttling device is determined based on the indoor dew point temperature.

[0010] Optionally, the outdoor 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 tube 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 eighth port of the outdoor heat exchanger is connected to the indoor heat exchanger through the throttling device.

[0011] 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.

[0012] Optionally, a plurality of first heat exchange tubes and second heat exchange tubes are arranged sequentially in a vertical direction, with the second heat exchange tube disposed below the plurality of first heat exchange tubes.

[0013] Optionally, 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.

[0014] In the constant temperature and dehumidification control method of the air conditioner of the present invention, firstly, since the compressor frequency is determined based on the indoor dew point temperature, it is possible to ensure that the temperature of the indoor heat exchanger (evaporator) coil is precisely controlled below the dew point, providing a fundamental guarantee for efficient dehumidification. Secondly, since the refrigerant flow path of the outdoor heat exchanger is adjusted according to both the compressor frequency and the outdoor ambient temperature, dynamic matching and precise control of the overall cooling capacity of the system are achieved. This allows the air conditioner to continuously and efficiently dehumidify while effectively suppressing the drop in room temperature caused by excessive cooling, ultimately achieving a balance between constant temperature and dehumidification.

[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 a constant temperature and dehumidification control method for an air conditioner according to an embodiment of the present invention; Figure 2 This is a schematic flowchart of a constant temperature and dehumidification control method for an air conditioner according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a heat exchanger in an air conditioner according to an embodiment of the present invention; Figure 4 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 5 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 6 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 7 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 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 five streams in cooling mode. Detailed Implementation

[0017] This is a reference below. Figures 1 to 8 This invention describes a method for controlling the constant temperature and dehumidification of 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" and "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 a constant temperature and dehumidification control method for an air conditioner according to an embodiment of the present invention, as shown below. Figure 1 As shown, and with reference Figures 2 to 8 This invention provides a method for constant temperature and dehumidification control of an air conditioner. The air conditioner includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a throttling device.

[0022] The constant temperature and dehumidification control method for air conditioners may include the following steps: Step S100: Determine whether constant temperature dehumidification is required; if so, proceed to S200. Step S200: Obtain the indoor dew point temperature; Step S300: Determine the operating frequency of the compressor based on the indoor dew point temperature; Step S400: Obtain the outdoor ambient temperature; Step S500: Determine the target refrigerant flow path in the outdoor heat exchanger based on the outdoor ambient temperature and the compressor operating frequency, so that the refrigerant flow path in the outdoor heat exchanger corresponds to the outdoor ambient temperature and the compressor operating frequency. In step S600, the compressor is adjusted according to the determined compressor operating frequency, and the refrigerant flow path of the outdoor heat exchanger is the target refrigerant flow path.

[0023] In this embodiment, when the air conditioner starts the constant temperature dehumidification mode, it first determines whether dehumidification is needed. If so, the indoor dew point temperature is acquired. Subsequently, the compressor's operating frequency is determined based on this dew point temperature to ensure that the air conditioner has basic dehumidification capabilities. Simultaneously, the outdoor ambient temperature is acquired, and combined with the determined compressor frequency, the target refrigerant flow path for the outdoor heat exchanger is comprehensively determined. Finally, the compressor is adjusted to the target frequency, and the outdoor heat exchanger is switched to the target flow path state.

[0024] In this embodiment, firstly, by determining the compressor frequency based on the indoor dew point temperature, the temperature of the indoor heat exchanger (evaporator) coil can be precisely controlled below the dew point, providing a fundamental guarantee for efficient dehumidification. Secondly, by adjusting the refrigerant flow path of the outdoor heat exchanger based on both the compressor frequency and the outdoor ambient temperature, dynamic matching and precise control of the overall system cooling capacity are achieved. This allows the air conditioner to continuously and efficiently dehumidify while effectively suppressing room temperature drops caused by excessive cooling, ultimately achieving a balance between constant temperature and dehumidification, significantly improving comfort and avoiding energy waste.

[0025] like Figure 2 As shown, in some optional embodiments of the present invention, step S300, determining the operating frequency of the compressor based on the indoor dew point temperature, may include the following steps: Step S310: Obtain the indoor target temperature, indoor ambient temperature, and indoor heat exchanger temperature; Step S320: Determine the change in the compressor's operating frequency based on the indoor target temperature, indoor dew point temperature, indoor heat exchanger temperature, and indoor ambient temperature. Step S330: Determine the operating frequency of the compressor based on the change.

[0026] In this embodiment, the compressor frequency is determined based on the indoor target temperature, indoor dew point temperature, indoor heat exchanger temperature, and indoor ambient temperature, allowing for more precise compressor frequency adjustment. This not only avoids over-dehumidification and temperature fluctuations but also significantly enhances the system's adaptability and stability in response to environmental changes.

[0027] In some optional embodiments of the present invention, step S320 includes: determining the change in the operating frequency of the compressor according to the following formula: ; Wherein, △F is the change in the operating frequency of the compressor; K1 is the first preset coefficient; K2 is the second preset coefficient; T1 is the indoor ambient temperature; T2 is the indoor target temperature; T3 is the temperature of the indoor heat exchanger; and T4 is the indoor dew point temperature.

[0028] The first preset coefficient refers to the proportional coefficient of room temperature deviation, which can be 5~10Hz / ℃.

[0029] The second preset coefficient refers to the proportional coefficient of the temperature deviation of the indoor heat exchanger, which can be 3~8Hz / ℃.

[0030] Step S330 includes: obtaining the current frequency of the compressor; and obtaining the operating frequency of the compressor by combining the current frequency of the compressor with the aforementioned change.

[0031] In some optional embodiments of the present invention, the constant temperature dehumidification control method further includes: adjusting the compressor according to a determined compressor operating frequency when the temperature of the indoor heat exchanger is greater than or equal to the indoor dew point temperature; and adjusting the compressor according to a determined compressor operating frequency when the temperature of the indoor heat exchanger is less than the indoor dew point temperature and the difference between the indoor dew point temperature and the temperature of the indoor heat exchanger is greater than a preset difference.

[0032] This embodiment precisely defines when to adjust the compressor frequency. Specifically, frequency adjustment is only performed when either of the following conditions is met: First, the indoor heat exchanger temperature is greater than or equal to the dew point temperature, indicating insufficient dehumidification capacity, requiring increased cooling to start or restore dehumidification; Second, the indoor heat exchanger temperature is lower than the dew point temperature, but the difference exceeds a preset value, indicating a risk of over-cooling and dehumidification, requiring reduced cooling to maintain a constant temperature. Therefore, this embodiment effectively avoids frequent operation or oscillation of the compressor within the critical stable range of "indoor heat exchanger temperature slightly lower than the dew point temperature," thereby significantly reducing the overall energy consumption of the system while ensuring constant temperature dehumidification, reducing compressor mechanical wear, and improving equipment lifespan and operational reliability.

[0033] Furthermore, the preset difference can be 4℃ to 6℃. Preferably, the preset difference can be 5℃.

[0034] In some optional embodiments of the present invention, the constant temperature dehumidification control method further includes: when the temperature of the indoor heat exchanger is lower than the indoor dew point temperature, and the difference between the indoor dew point temperature and the temperature of the indoor heat exchanger is less than or equal to a preset difference, controlling the compressor to run at the current frequency without adjusting the compressor.

[0035] In some optional embodiments of the present invention, the constant temperature dehumidification control method further includes: increasing the opening degree of the throttling device when adjusting the compressor according to a determined compressor operating frequency to increase the compressor operating frequency.

[0036] In this embodiment, increasing the compressor frequency and widening the throttling device opening ensures that the indoor heat exchanger (evaporator) temperature remains stable within the optimal dehumidification range, preventing dehumidification interruptions or efficiency reductions caused by frosting due to excessively low evaporation temperatures. It also prevents abnormal drops in evaporation pressure, ensuring the compressor operates under safe conditions and improving system reliability and lifespan. By maintaining the system within its high-efficiency parameter range, energy waste caused by supply-demand mismatch is avoided, thus achieving energy-saving operation. Therefore, this embodiment achieves efficient, stable, and energy-saving constant-temperature dehumidification.

[0037] In some optional embodiments of the present invention, the constant temperature dehumidification control method further includes: reducing the opening degree of the throttling device when adjusting the compressor according to a determined compressor operating frequency to reduce the compressor operating frequency.

[0038] In this embodiment, when the compressor frequency decreases, its suction capacity weakens accordingly. Simultaneously reducing the opening of the throttling device directly reduces the refrigerant flow into the indoor heat exchanger (evaporator), matching its delivery capacity after the compressor frequency is reduced. This prevents excessive liquid refrigerant from accumulating in the indoor heat exchanger (evaporator), causing pressure and temperature to rise, thus ensuring the surface temperature of the indoor heat exchanger (evaporator) remains stable below the dew point, maintaining continuous dehumidification capacity. Furthermore, it prevents incompletely evaporated refrigerant from flowing back to the compressor, effectively preventing liquid slugging and providing crucial safety assurance for the compressor.

[0039] In some optional embodiments of the present invention, the constant temperature dehumidification control method further includes: determining the opening degree or the amount of change in opening degree of the throttling device based on the indoor dew point temperature. This optimizes the refrigeration cycle efficiency according to actual dehumidification needs, improving the overall energy efficiency of the system while ensuring dehumidification effect.

[0040] like Figure 3As shown, in some optional embodiments of the present invention, the outdoor heat exchanger 1 includes a first tube 10, a second tube 20, and a plurality of heat exchange tubes. The plurality of heat exchange tubes include a plurality of first heat exchange tubes 30 and second heat exchange tubes 40. The first tube 10 is provided with a first port 11, a plurality of second ports 12, a third port 13, and a fourth port 14 sequentially along its extension direction; a first on / off device is provided between every two adjacent second ports 12, a second on / off device 52 is provided between the last second port 12 and the third port 13, and a third on / off device 53 is provided between the third port 13 and the fourth port 14. The second tube 20 is provided with a plurality of fifth ports 21, a sixth port 22, a seventh port 23, and an eighth port 24 sequentially along its extension direction; a fourth on / off device is provided between every two adjacent fifth ports 21; a fifth on / off device 55 is provided between the last fifth port 21 and the sixth port 22, and a sixth on / off 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. One of the first port 11 and the eighth port 24 is the inlet of the outdoor heat exchanger 1, and the other is the outlet of the outdoor heat exchanger 1. The eighth port 24 is connected to the indoor heat exchanger through a throttling device.

[0041] Specifically, during the cooling and constant temperature dehumidification operation of the air conditioner, the first port 11 is the inlet of the outdoor heat exchanger 1, into which high-temperature and high-pressure gaseous refrigerant is introduced, and the eighth port 24 is the outlet of the outdoor heat exchanger 1. During the heating operation of the air conditioner, the refrigerant flows in the reverse direction, with the eighth port 24 becoming the inlet of the outdoor heat exchanger 1 and the first port 11 becoming the outlet of the outdoor heat exchanger 1. By controlling the opening and closing combinations of the first to eighth on / off devices 58, the flow path of the refrigerant inside the outdoor heat exchanger 1 can be changed.

[0042] 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 outdoor heat exchanger 1 to select the optimal flow path according to real-time operating conditions, 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.

[0043] 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 outdoor heat exchanger 1.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] In this embodiment, the refrigerant flow path of the outdoor heat exchanger includes at least the following: Figures 4 to 8 The situation shown is as follows: where, Figure 4 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 5 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 6 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 7 The 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 8 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.

[0049] 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.

[0050] 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 outdoor 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.

[0051] This embodiment optimizes the spatial layout of the outdoor heat exchanger 1, which helps to improve the uniformity of heat exchange and enhances the structural compactness, making it suitable for various installation environments.

[0052] In some optional embodiments of the present invention, step S500 specifically includes: 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. Among them, the first preset temperature value > the second preset temperature value > the third preset temperature value > the fourth preset temperature value.

[0053] Furthermore, 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 allows the refrigerant to flow through all the heat exchange tubes.

[0054] When the air conditioner is cooling, and 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 a 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, while third on / off device 53 and sixth on / off device 56 are all in the open 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, while third on / off device 53 and seventh on / off device 57 are all in the open state. In other words, if... Figure 8 As shown, 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.

[0055] 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, 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 off 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 off state. In other words, if... Figure 6 As shown, the refrigerant flow path allows the refrigerant to directly enter the three heat exchange tubes through the first port, and to flow through all the heat exchange tubes.

[0056] 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 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 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 off state. In other words, if... Figure 7As shown, the refrigerant flow path allows the refrigerant to directly enter the four heat exchange tubes through the first port, and to flow through all the heat exchange tubes.

[0057] 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 off state. In other words, if... Figure 5 As shown, 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] The preset temperature and operating frequency values ​​mentioned above can be set according to the specific model of the air conditioner. 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℃, and the first preset value can be 70Hz.

[0064] This embodiment precisely matches the variable flow path capability of the outdoor heat exchanger 1 with the actual operating conditions of the air conditioner, enabling intelligent and efficient flow path switching. By presetting the optimal flow path mode for different temperature ranges and load levels (reflected by compressor frequency), the outdoor heat exchanger can operate at its most efficient state under any operating conditions.

[0065] In some alternative embodiments of the invention, the throttling device is a throttling element with an adjustable opening, such as an electronic expansion valve or a thermostatic expansion valve.

[0066] In some optional embodiments of the present invention, the acquisition of the indoor dew point temperature is achieved by: real-time detection of the indoor ambient temperature and indoor relative humidity using a temperature and humidity sensor installed in the indoor unit of the air conditioner; and calculation of the current indoor dew point temperature based on the indoor ambient temperature and indoor relative humidity.

[0067] 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. A method for controlling constant temperature and dehumidification in an air conditioner, characterized in that, The air conditioner includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a throttling device; The constant temperature and dehumidification control method includes: Determine whether constant temperature dehumidification is needed; If so, obtain the indoor dew point temperature; The operating frequency of the compressor is determined based on the indoor dew point temperature; Obtain the outdoor ambient temperature; Based on the outdoor ambient temperature and the operating frequency of the compressor, the target refrigerant flow path in the outdoor heat exchanger is determined so that the refrigerant flow path in the outdoor heat exchanger corresponds to the outdoor ambient temperature and the operating frequency of the compressor. The compressor is adjusted according to the determined operating frequency, and the refrigerant flow path of the outdoor heat exchanger is aligned with the target refrigerant flow path.

2. The constant temperature dehumidification control method according to claim 1, characterized in that, The step of determining the operating frequency of the compressor based on the indoor dew point temperature includes: The target indoor temperature, the indoor ambient temperature, and the temperature of the indoor heat exchanger are obtained. The change in the operating frequency of the compressor is determined based on the indoor target temperature, the indoor dew point temperature, the temperature of the indoor heat exchanger, and the indoor ambient temperature. The operating frequency of the compressor is determined based on the change.

3. The constant temperature and dehumidification control method according to claim 2, characterized in that, Also includes: When the temperature of the indoor heat exchanger is greater than or equal to the indoor dew point temperature, the compressor is adjusted according to the determined operating frequency of the compressor. When the temperature of the indoor heat exchanger is lower than the indoor dew point temperature, and the difference between the indoor dew point temperature and the temperature of the indoor heat exchanger is greater than a preset difference, the compressor is adjusted according to the determined operating frequency of the compressor.

4. The constant temperature and dehumidification control method according to claim 1, characterized in that, Also includes: When the compressor is adjusted according to the determined operating frequency of the compressor to increase the operating frequency of the compressor, the opening degree of the throttling device is increased.

5. The constant temperature and dehumidification control method according to claim 1, characterized in that, Also includes: When the compressor is adjusted according to the determined operating frequency of the compressor to reduce the operating frequency of the compressor, the opening degree of the throttling device is reduced.

6. The constant temperature dehumidification control method according to claim 4 or 5, characterized in that, Also includes: The opening degree or change in opening degree of the throttling device is determined based on the indoor dew point temperature.

7. The constant temperature and dehumidification control method according to claim 1, characterized in that, The outdoor 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 tube 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 eighth port of the outdoor heat exchanger is connected to the indoor heat exchanger through the throttling device.

8. The constant temperature and dehumidification control method according to claim 7, characterized in that, The number of the second port is four, the number of the fifth port is four; 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.

9. The constant temperature and dehumidification control method according to claim 7, characterized in that, 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.

10. The constant temperature dehumidification control method according to claim 7, characterized in that, 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.

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