Air conditioner outdoor unit, air conditioner unit and air conditioner control method

Abstract

This invention belongs to the field of air conditioning technology and discloses an air conditioner outdoor unit, an air conditioning unit, and an air conditioning control method. The air conditioner outdoor unit includes an outdoor unit casing, a mounting bracket, a heat exchanger, and a fan unit. The outdoor unit casing has an air outlet. The mounting bracket divides the interior of the outdoor unit casing into a first cavity and a second cavity. The heat exchanger is located in the second cavity. The fan unit includes a main fan and at least one auxiliary fan, both mounted on the mounting bracket. The main fan is located in the first cavity between the air outlet and the mounting bracket, and the auxiliary fan is located in the second cavity between the mounting bracket and the heat exchanger. The main fan and the auxiliary fan operate independently, and the diameter of the auxiliary fan is smaller than that of the main fan. This air conditioner outdoor unit enables uniform heat exchange in the heat exchanger, improves the utilization rate of the heat exchanger, and allows for adjustment of the fan assembly under different operating loads, thereby improving the operating capacity and application range of the air conditioner outdoor unit.

Description

Technical Field

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

[0002] Air-cooled chilled and hot air conditioning units, whether multi-split or modular, typically use a V-shaped or straight heat exchanger on the outdoor unit. A fan is installed on top of the heat exchanger, creating negative pressure on the surface of the heat exchanger, which causes air to flow through the fan and the heat exchanger.

[0003] However, in the existing technology, the fan installed on the top of the heat exchanger inevitably brings the following problems: First, the surface pressure difference and wind speed are large on the upper part of the heat exchanger near the fan, while the surface pressure difference and wind speed are relatively small on the lower part of the heat exchanger away from the fan, which will lead to uneven heat exchange and low utilization rate of the heat exchanger; Second, when the outdoor unit is running at low load, because the size of the fan blades cannot be changed in the existing technology, and the motor driving the fan is affected by the motor's own torque, the motor and the fan itself have a minimum speed. This will result in a fixed minimum airflow from the fan, which will cause the indoor heat exchanger to freeze and the outlet air temperature to be too low when the outdoor unit is running at low load, thus reducing the user experience.

[0004] Therefore, there is an urgent need to provide an air conditioner outdoor unit to solve the aforementioned technical problems in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide an air conditioner outdoor unit that enables uniform heat exchange in the heat exchanger, improves the utilization rate of the heat exchanger, and allows for adjustment of the fan assembly under different operating loads, thereby enhancing the operating capacity and application range of the air conditioner outdoor unit.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The outdoor unit of the air conditioner includes an outdoor unit casing, a mounting bracket, a heat exchanger, and a fan unit. The outdoor unit casing is provided with an air outlet. The mounting bracket divides the interior of the outdoor unit casing into a first cavity and a second cavity. The heat exchanger is disposed in the second cavity. The fan unit is used to discharge the gas that has undergone heat exchange in the heat exchanger to the air outlet. The fan unit includes a main fan and at least one auxiliary fan, both mounted on the mounting bracket. The main fan is disposed in the first cavity between the air outlet and the mounting bracket, and the auxiliary fan is disposed in the second cavity between the mounting bracket and the heat exchanger. The main fan and the auxiliary fan operate independently, and the diameter of the auxiliary fan is smaller than the diameter of the main fan.

[0008] Optionally, the diameter of the auxiliary fan is 0.618 times the diameter of the main fan.

[0009] Optionally, the air outlet is located at the top of the outer casing, and one auxiliary fan is provided. The main fan and the auxiliary fan are arranged coaxially.

[0010] Optionally, the auxiliary fan includes an auxiliary shaft connected to the mounting bracket, the auxiliary shaft being set at a predetermined length in the vertical direction.

[0011] Optionally, the preset length is 0.5 times the height of the heat exchanger in the vertical direction.

[0012] Optionally, the heat exchanger includes at least two heat exchange plates, which are arranged within the second cavity.

[0013] Optionally, the heat exchange plate is arranged to extend vertically or at a preset angle to the vertical direction.

[0014] Another object of the present invention is to provide an air conditioning unit, which includes an indoor unit and an outdoor unit as described in any of the above embodiments, wherein a refrigerant circuit is provided between the indoor unit and the outdoor unit.

[0015] Another object of the present invention is to provide an air conditioning control method for controlling an outdoor unit of an air conditioner as described in any of the above embodiments, comprising the steps of:

[0016] The following temperature parameters are measured: air inlet temperature TH1, temperature at the end of the heat exchanger furthest from the main fan TH2, temperature at the end of the heat exchanger closest to the main fan TH4, temperature at the middle position of the heat exchanger TH3, and coil temperature of the heat exchanger TH7.

[0017] The operation of the fan unit is controlled based on the relationship between the difference between the coil temperature TH7 and the air inlet temperature TH1 and the preset temperature range.

[0018] Optionally, the fan unit operation is controlled based on the relationship between the difference between the coil temperature TH7 and the inlet air temperature TH1 and a preset temperature range, including:

[0019] When the difference between the coil temperature TH7 and the air inlet temperature TH1 is greater than or equal to the maximum value of the preset temperature range, the main fan and the auxiliary fan are controlled to run simultaneously.

[0020] When the difference between the coil temperature TH7 and the air inlet temperature TH1 is less than the minimum value of the preset temperature range, the main fan is turned off and only the auxiliary fan is turned on.

[0021] When the difference between the coil temperature TH7 and the intake side temperature TH1 is within the preset temperature range, reduce the maximum speed of the main fan and increase the maximum speed of the auxiliary fan until the values ​​of TH4-TH3 and TH3-TH2 are not greater than the preset threshold.

[0022] Beneficial effects:

[0023] The outdoor unit of this invention has a main fan and an auxiliary fan, which can operate independently. The main fan and auxiliary fan can simultaneously or independently exhaust the hot air flowing through the heat exchanger to the air outlet, cooling the heat exchanger. When the main fan and auxiliary fan operate simultaneously, the airflow is further increased, improving the operating capacity of the outdoor unit. At this time, the auxiliary fan can also increase the pressure difference between the upper and lower surfaces of the middle and lower parts of the heat exchanger, making heat exchange and temperature uniform. Furthermore, because the diameter of the auxiliary fan is smaller than that of the main fan, when the outdoor unit is operating at low load, only the auxiliary fan needs to be activated. Compared to activating only the main fan, this reduces the airflow through the heat exchanger, ensuring that the heat exchange of the outdoor unit matches that of the indoor unit. This avoids problems such as excessive cooling of the outdoor unit at low loads, which could lead to icing of the indoor unit's heat exchanger and excessively low outlet air temperature. This expands the operating load range of the outdoor unit and broadens its applicability. Additionally, the convection of the auxiliary fan can remove heat from the electrical control box of the outdoor unit, preventing overheating and improving the service life and reliability of the outdoor unit. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an air conditioner outdoor unit in one embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the outdoor unit of an air conditioner in another embodiment provided by the specific implementation of the present invention;

[0026] Figure 3 This is a flowchart of an air conditioning control method provided in a specific embodiment of the present invention.

[0027] In the picture:

[0028] 100. External casing; 110. Air outlet; 120. Mounting bracket; 200. Fan unit; 210. Main fan; 220. Auxiliary fan; 221. Auxiliary shaft; 300. Heat exchanger; 310. Heat exchange plate. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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," and "under" the second feature includes the first feature 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.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0033] This embodiment provides an air conditioning unit, which includes an indoor unit and an outdoor unit, with a refrigerant circuit connecting the indoor and outdoor units. Specifically, the air conditioning unit has a refrigerant circuit formed by sequentially connecting the compressor, heat exchanger 300, expansion valve of the outdoor unit, and heat exchanger of the indoor unit in a loop via a four-way valve. It also includes an outdoor fan unit 200 with a fan motor, located near the heat exchanger 300; an indoor fan with an indoor fan motor, located near the heat exchanger; and a control unit for controlling the compressor, expansion valve, four-way valve, outdoor fan, and indoor fan. These are all conventional techniques in the art and will not be elaborated further here.

[0034] Existing air conditioning units have the following problems with their outdoor units: First, the surface pressure difference and air velocity are high on the upper part of the heat exchanger 300 near the fan, while the surface pressure difference and air velocity are relatively low on the lower part of the heat exchanger 300 away from the fan. This leads to uneven heat exchange and low utilization rate of the heat exchanger 300. Second, when the outdoor unit is running under low load, the size of the fan blades cannot be changed in the current technology. The motor speed that drives the fan has a minimum speed due to the influence of motor torque. This results in a fixed minimum airflow from the fan. This minimum value can cause problems such as freezing of the indoor heat exchanger and excessively low outlet air temperature when the outdoor unit is running under low load, thus reducing the user experience.

[0035] To address the aforementioned technical problems, this embodiment provides an outdoor air conditioning unit that enables uniform heat exchange in the heat exchanger 300, improves the utilization rate of the heat exchanger 300, and allows for adjustment of the fan assembly under different operating loads, thereby enhancing the operating capacity and application range of the outdoor air conditioning unit.

[0036] Specifically, such as Figure 1 As shown, the outdoor unit of the air conditioner includes an outdoor unit housing 100, a mounting bracket 120, a heat exchanger 300, and a fan unit 200. The outdoor unit housing 100 is provided with an air outlet 110. The mounting bracket 120 divides the interior of the outdoor unit housing 100 into a first cavity and a second cavity. The heat exchanger 300 is disposed in the second cavity. The fan unit 200 is used to discharge the gas that has undergone heat exchange in the heat exchanger 300 to the air outlet 110. The fan unit 200 includes a main fan 210 and at least one auxiliary fan 220, both mounted on the mounting bracket 120. The main fan 210 is disposed in the first cavity between the air outlet 110 and the mounting bracket 120, and the auxiliary fan 220 is disposed in the second cavity between the mounting bracket 120 and the heat exchanger 300. The main fan 210 and the auxiliary fan 220 operate independently, and the diameter of the auxiliary fan 220 is smaller than the diameter of the main fan 210.

[0037] The outdoor unit of the air conditioner in this embodiment has a main fan 210 and an auxiliary fan 220, which can operate independently. The main fan 210 and the auxiliary fan 220 can simultaneously or independently exhaust the hot air flowing through the heat exchanger 300 to the air outlet 110 to cool the heat exchanger 300. When the main fan 210 and the auxiliary fan 220 operate simultaneously, their airflow further increases, improving the operating capacity of the outdoor unit. At this time, the auxiliary fan 220 also increases the pressure difference between the upper and lower surfaces of the middle and lower parts of the heat exchanger 300, resulting in more uniform heat exchange and temperature. Furthermore, since the diameter of the auxiliary fan 220 is smaller than that of the main fan 210, when the outdoor unit is operating at low load, only the auxiliary fan 220 needs to be activated. Compared to activating only the main fan 210, this reduces the airflow through the heat exchanger 300, ensuring that the heat exchange of the outdoor unit matches that of the indoor unit. This avoids excessive cooling of the outdoor unit at low loads, which could lead to icing of the indoor unit's heat exchanger and excessively low outlet air temperature. This expands the operating load range of the outdoor unit and broadens its applicability. Additionally, the convection of the auxiliary fan 220 can remove heat from the outdoor unit's electrical control box, preventing overheating and improving the unit's lifespan and reliability.

[0038] In a preferred embodiment, the diameter of the auxiliary fan 220 is 0.618 times the diameter of the main fan 210. This 0.618-times-the-diameter of the auxiliary fan 220 is the optimal parameter for design and calculation under the structure of the outdoor unit of the air conditioner in this embodiment. In other optional embodiments, those skilled in the art can design and calculate based on the size of the outdoor unit, the parameters of the heat exchanger 300, the parameters of the main fan 210, and the parameters of the motors driving the main fan 210 and the auxiliary fan 220. This can be done through experimental methods or numerical simulation methods, and this embodiment does not impose specific limitations.

[0039] Optionally, the air outlet 110 is located at the top of the outdoor unit casing 100, and one auxiliary fan 220 is provided. The main fan 210 and the auxiliary fan 220 are coaxially arranged vertically. Since the density of hot air is less than that of cold air, hot air has a natural upward tendency. Because the air outlet 110 is located at the top of the outdoor unit casing 100, the air outlet capacity of the air outlet 110 can be improved, and hot air can be prevented from accumulating and blocking the air outlet 110, thereby improving the operating efficiency of the outdoor unit. In this embodiment, one auxiliary fan 220 is provided, and the main fan 210 and the auxiliary fan 220 are coaxially arranged vertically. This coaxial arrangement is simpler and can reduce production and design costs. Of course, multiple auxiliary fans 220 can be provided, evenly distributed at the lower end of the main fan 210. This method has a larger adjustment range and a wider range of applications, but the control is more complex. Alternatively, multiple main fans 210 and auxiliary fans 220 can be coaxially arranged one-to-one to improve the operating capacity of the outdoor unit. This will not be elaborated here.

[0040] In this embodiment, the auxiliary fan 220 includes an auxiliary rotating shaft 221 connected to the mounting bracket 120. The auxiliary rotating shaft 221 is set with a predetermined length in the vertical direction. Because the auxiliary rotating shaft 221 is set with a predetermined length in the vertical direction, the auxiliary fan 220 can be as close as possible to the bottom of the heat exchanger 300, thereby increasing the pressure difference between the upper and lower surfaces of the bottom of the heat exchanger 300. This results in more uniform heat exchange and temperature distribution in the heat exchanger 300, improving its heat exchange efficiency.

[0041] Furthermore, the aforementioned preset length is 0.5 times the vertical height of the heat exchanger 300. This configuration of the auxiliary shaft 221 ensures that the auxiliary fan 220 is located at the center of the heat exchanger 300, further guaranteeing uniform heat exchange and improving heat exchange efficiency.

[0042] like Figure 1 and Figure 2 As shown, optionally, the heat exchanger 300 includes at least two heat exchange plates 310, which are arranged within the second cavity. The arrangement of multiple heat exchange plates 310 within the second cavity increases the surface area of ​​the heat exchanger 300, thereby improving its heat exchange capacity and operational efficiency.

[0043] Specifically, the heat exchange plate 310 is arranged to extend vertically or at a preset angle to the vertical direction. For example... Figure 1 As shown, in an optional embodiment, both heat exchange plates 310 are set at a preset angle to the vertical direction, making the two heat exchange plates 310 V-shaped; as Figure 2As shown, in another optional embodiment, the only difference from the above embodiment is that one heat exchange plate 310 is arranged in the vertical direction, and the other heat exchange plate 310 is arranged at a preset angle to the vertical direction. Those skilled in the art can choose the arrangement of the heat exchange plates 310 according to their needs, which will not be described in detail here.

[0044] like Figure 2 and Figure 3 As shown, this embodiment also provides an air conditioning control method for controlling the outdoor unit of an air conditioner as described in any of the above solutions, including the following steps:

[0045] The following temperature parameters are measured: air inlet temperature TH1, temperature TH2 at the end of heat exchanger 300 furthest from main fan 210, temperature TH4 at the end of heat exchanger 300 closest to main fan 210, temperature TH3 at the middle position of heat exchanger 300, and coil temperature TH7 of heat exchanger 300. Based on the relationship between the difference between coil temperature TH7 and air inlet temperature TH1 and a preset temperature range, the fan unit 200 is controlled to operate.

[0046] Furthermore, based on the relationship between the difference between the coil temperature TH7 and the inlet air temperature TH1 and the preset temperature range, the operation of the fan unit 200 is controlled, including:

[0047] When the difference between the coil temperature TH7 and the air intake temperature TH1 is greater than or equal to the maximum value of the preset temperature range, the main fan 210 and the auxiliary fan 220 are controlled to run simultaneously; when the difference between the coil temperature TH7 and the air intake temperature TH1 is less than the minimum value of the preset temperature range, the main fan 210 is turned off, and only the auxiliary fan 220 is turned on; when the difference between the coil temperature TH7 and the air intake temperature TH1 is within the preset temperature range, the maximum speed of the main fan 210 is reduced, and the maximum speed of the auxiliary fan 220 is increased, until the values ​​of TH4-TH3 and TH3-TH2 are not greater than the preset threshold.

[0048] Specifically, this embodiment includes the following steps: S1, powering on; S2, temperature detection: after powering on, the following temperatures are detected: air inlet temperature TH1, temperature TH2 at the end of the heat exchanger 300 furthest from the main fan 210, temperature TH4 at the end of the heat exchanger 300 furthest from the main fan 210, temperature TH3 at the middle position of the heat exchanger 300, and coil temperature TH7 of the heat exchanger 300; S3, comparing the detected temperature parameters and controlling the on / off state of the fan unit 200, wherein: if TH7-TH... When 1 ≥ 12℃, the main fan 210 and the auxiliary fan 220 operate simultaneously; if 7℃ < TH7-TH1 < 12℃, proceed to step S4; if TH7-TH1 < 7℃, turn off the main fan 210 and only turn on the auxiliary fan 220; S4, compare the detected temperature parameters and adjust the speed of the fan unit 200: if TH4-TH3 > 2℃ and TH3-TH2 > 2℃, reduce the maximum speed of the main fan 210 and increase the maximum speed of the auxiliary fan 220 until the values ​​of TH4-TH3 and TH3-TH2 are not greater than 1℃.

[0049] The air conditioning control method in this embodiment detects... Figure 2 The following temperature parameters are considered: TH1 (inlet side temperature of heat exchanger 300), TH2 (temperature of the end of heat exchanger 300 furthest from main fan 210), TH4 (temperature of the end of heat exchanger 300 closest to main fan 210), TH3 (temperature of the middle position of heat exchanger 300), and TH7 (coil temperature of heat exchanger 300). When TH7-TH1≥12℃, it is considered that the outdoor unit of the air conditioner has a range for improved heat exchange, so the auxiliary fan 220 is turned on to improve the operating capacity of the outdoor unit. When 7℃<TH7-TH1<12℃, it is determined that the heat exchanger 300 is in an adjustable range for heat dissipation. When TH4-TH3>2℃ and TH3-TH2>2℃, the main fan temperature is reduced. Main fan 210 is turned off at its maximum speed, and auxiliary fan 220 is turned on at its maximum speed until the values ​​of TH4-TH3 and TH3-TH2 are both no greater than 1℃, so that heat exchanger 300 can exchange heat evenly. If TH7-TH1 < 7℃, the air conditioning unit is considered to be in a low-load state and heat exchange needs to be reduced. At this time, the main fan 210 is turned off and only auxiliary fan 220 is turned on, so that the heat exchange of the outdoor unit is consistent with the heat exchange of the indoor unit. This avoids the problem of the indoor unit heat exchanger freezing due to excessive cooling of the outdoor unit under low load. In addition, the convection of auxiliary fan 220 can remove the heat in the electrical control box of the outdoor unit, preventing the electrical control box from overheating and improving the reliability and safety during use.

[0050] Specifically, when TH4-TH3 > 2℃ and TH3-TH2 > 2℃, the maximum speed of the main fan 210 is reduced by 10%, and the maximum speed of the auxiliary fan 220 is increased by 10%, so that the values ​​of TH4-TH3 and TH3-TH2 are controlled within 1℃, making the overall temperature and heat exchange of the heat exchanger 300 more uniform.

[0051] Furthermore, prior to step S2, a pre-running step S11 is included: after power-on, only the main fan 210 is turned on and runs for a preset time. This step is to determine the operating status of the outdoor unit of the air conditioner after running for a period of time, and to more accurately understand the operating status of the air conditioning unit under the ambient temperature. Specifically, after the air conditioning unit is powered on, the main fan 210 is turned on first, and after running for 5 minutes, the temperatures of TH1 and TH7 are determined, followed by subsequent control steps.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An air conditioning control method, characterized in that, For controlling the outdoor unit of an air conditioner, the outdoor unit of the air conditioner includes: An outer casing (100) is provided with an air outlet (110); Mounting bracket (120) divides the interior of the outer casing (100) into a first cavity and a second cavity; A heat exchanger (300) is disposed in the second cavity; A fan unit (200) is used to discharge gas that has undergone heat exchange in a heat exchanger (300) to an air outlet (110); the fan unit (200) includes a main fan (210) and at least one auxiliary fan (220) both mounted on a mounting bracket (120); the main fan (210) is disposed in a first cavity between the air outlet (110) and the mounting bracket (120); the auxiliary fan (220) is disposed in a second cavity between the mounting bracket (120) and the heat exchanger (300); wherein the main fan (210) and the auxiliary fan (220) operate independently, and the diameter of the auxiliary fan (220) is smaller than the diameter of the main fan (210); The air conditioning control method includes the following steps: The following temperature parameters are measured: air inlet temperature TH1, temperature TH2 at the end of the heat exchanger (300) away from the main fan (210), temperature TH4 at the end of the heat exchanger (300) close to the main fan (210), temperature TH3 at the middle position of the heat exchanger (300), and coil temperature TH7 of the heat exchanger (300). Based on the relationship between the difference between the coil temperature TH7 and the inlet air temperature TH1 and the preset temperature range, the operation of the fan unit is controlled, including: When the difference between the coil temperature TH7 and the air inlet temperature TH1 is greater than or equal to the maximum value of the preset temperature range, the main fan (210) and the auxiliary fan (220) are controlled to run simultaneously. When the difference between the coil temperature TH7 and the air inlet temperature TH1 is less than the minimum value of the preset temperature range, the main fan (210) is turned off and only the auxiliary fan (220) is turned on. When the difference between the coil temperature TH7 and the air intake temperature TH1 is within the preset temperature range, the maximum speed of the main fan (210) is reduced and the maximum speed of the auxiliary fan (220) is increased until the values ​​of TH4-TH3 and TH3-TH2 are not greater than the preset threshold.

2. The air conditioning control method according to claim 1, characterized in that, The diameter of the auxiliary fan (220) is 0.618 times the diameter of the main fan (210).

3. The air conditioning control method according to claim 1, characterized in that, The air outlet (110) is located on the top of the outer casing (100), and there is one auxiliary fan (220). The main fan (210) and the auxiliary fan (220) are arranged coaxially.

4. The air conditioning control method according to claim 3, characterized in that, The auxiliary fan (220) includes an auxiliary rotating shaft (221) connected to the mounting bracket (120), and the auxiliary rotating shaft (221) is set at a preset length in the vertical direction.

5. The air conditioning control method according to claim 4, characterized in that, The preset length is 0.5 times the height of the heat exchanger (300) in the vertical direction.

6. The air conditioning control method according to claim 3, characterized in that, The heat exchanger (300) includes at least two heat exchange plates (310) arranged within the second cavity.

7. The air conditioning control method according to claim 6, characterized in that, The heat exchange plate (310) is arranged to extend vertically or at a preset angle to the vertical direction.

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