Fresh air conditioner and fresh air outlet control method

Abstract

The application discloses a fresh air conditioner and a fresh air outlet control method, and comprises the following steps: S1, when the fresh air function is started, detecting whether the main fan is in a running state; S2, if it is determined that the main fan is in a running state and the air guide door is in an open state, then entering S3; S3, detecting the running mode of the fresh air conditioner; S4, if it is determined that the fresh air conditioner is in a cooling mode, a heating mode, a ventilation mode or a dehumidification mode, controlling the rotation speed of the fresh air fan to be less than the rotation speed of the main fan damper; if it is determined that the fresh air conditioner is in the dehumidification mode, then closing the fresh air function; S5, when the damper of the main fan in the same running mode of the fresh air conditioner is switched, repeating S4; when the running mode of the fresh air conditioner is switched, repeating S3 and S4. According to the fresh air control method in the application, the rotation speed of the fresh air fan is always less than the rotation speed of the main fan when the user obtains a larger fresh air volume, the noise value is controlled in a reasonable range, and the user experience is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioners, and more particularly to a fresh air conditioner and a fresh air outlet control method. Background Technology

[0002] Currently, most wall-mounted fresh air conditioners have their fresh air outlets located on the middle frame of the indoor unit. A cover is used to conceal the outlet, and multiple openings are created within this cover for fresh air to pass through. Generally, to achieve dust and insect prevention and an aesthetically pleasing appearance, the cover has numerous but small openings for fresh air delivery.

[0003] Therefore, when the air conditioner is set to high speed for fresh air, the following two problems are likely to occur:

[0004] 1. The fresh air is not properly vented. The fresh air generated at the fresh air outlet is trapped inside the fresh air cover and cannot be blown out from the through holes of the fresh air cover in time, making it difficult to increase the fresh air volume.

[0005] 2. When fresh air flows through the through holes of the fresh air cover, the fresh air flow rate is too fast due to the small size of the through holes, which can easily generate noise and abnormal sounds, thus affecting the user experience. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the purpose of this invention is to provide a fresh air conditioner and a fresh air outlet control method. By setting an additional air outlet channel below the fresh air inlet and opening and closing the air outlet channel through the opening and closing of the air guide damper, the fresh air volume is increased, the fresh air velocity is reduced, and the fresh air noise is reduced. Furthermore, the fresh air outlet control method of this invention balances the contradiction between fresh air noise and air volume.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A fresh air outlet control method includes setting the cooling mode with cooling fan speed limits C1, C2, C3, ..., Cmax, and controlling the fresh air fan within a second speed range b in this mode; setting the heating mode with heating fan speed limits H1, H2, H3, ..., Hmax, and controlling the fresh air fan within a third speed range c in this mode; and setting the ventilation mode with ventilation fan speed limits W1, W2, W3, ..., Wmax, and controlling the fresh air fan within a fourth speed range d in this mode.

[0009] Includes the following steps:

[0010] S1, when the fresh air function is turned on, detect whether the main fan is running;

[0011] S2, if it is determined that the main fan is not in operation and the air guide damper is in closed state, then control the speed of the fresh air fan in the first speed range a; if it is determined that the main fan is in operation and the air guide damper is in open state, then proceed to S3.

[0012] S3: Detects the operating mode of the fresh air conditioner and determines whether it is in cooling mode, heating mode, ventilation mode, or dehumidification mode;

[0013] S4: If the fresh air conditioner is determined to be in cooling mode, then the cooling fan speed of the main fan in cooling mode is detected, and the fresh air fan speed is controlled within the second speed range b, and the fresh air fan speed is controlled to be lower than the speed of the main fan fan speed. If the fresh air conditioner is determined to be in heating mode, then the heating fan speed of the main fan in heating mode is detected, and the fresh air fan speed is controlled within the third speed range c, and the fresh air fan speed is controlled to be lower than the speed of the main fan fan speed. If the fresh air conditioner is determined to be in ventilation mode, then the ventilation fan speed in ventilation mode is detected, and the fresh air fan speed is controlled within the fourth speed range d, and the fresh air fan speed is controlled to be lower than the speed of the main fan fan speed. If the fresh air conditioner is determined to be in dehumidification mode, then the fresh air function is turned off.

[0014] S5: When switching the main fan damper in the same operating mode of the fresh air conditioner, repeat S4; when switching the operating mode of the fresh air conditioner, repeat S3 and S4.

[0015] Preferably, the first speed range a is smaller than any one of the second speed range b, the third speed range c, and the fourth speed range d. The first speed range a includes a1, a2, and a3 gears, the second speed range b includes b1, b2, and b3 gears, the third speed range c includes c1, c2, and c3 gears, and the fourth speed range d includes d1, d2, and d3 gears.

[0016] Preferably, when switching the main fan speed of the fresh air conditioner to the same operating mode, the speed of the fresh air fan is simultaneously switched to match the speed of the main fan speed, and the speed of the fresh air fan is controlled to be less than the speed of the main fan speed.

[0017] A fresh air conditioner includes an indoor unit, a middle frame mounted on the indoor unit, a fresh air module, a fresh air cover, an air guide damper, and a controller. The fresh air module is located behind the middle frame and has a fresh air outlet. The middle frame has a fresh air vent for exposing the fresh air outlet. The fresh air cover is connected to the middle frame and can cover the fresh air vent. The fresh air cover has multiple through holes. The air guide damper is rotatably positioned below the middle frame. A fresh air outlet control method as described above is used. The controller is used to detect whether the main fan is operating. The system includes functions for detecting the operating mode of the fresh air conditioner, detecting the windshield of the main fan of the fresh air conditioner, and controlling the speed of the fresh air fan. A fresh air outlet channel is provided on the middle frame, located below the fresh air inlet. A surrounding rib is also provided on the middle frame, surrounding the fresh air inlet. The front end of the surrounding rib abuts against the fresh air cover, and the lower end of the surrounding rib is open, thus connecting the fresh air inlet and the fresh air outlet channel. A baffle is provided on the air guide door. When the air guide door is closed, the baffle is located within the fresh air outlet channel and can close the fresh air outlet channel.

[0018] Preferably, when the air guide damper is open and the fresh air module is running, the fresh air from the fresh air module is blown out simultaneously through the through holes on the fresh air cover and the opening at the lower end of the rib; when the air guide damper is closed and the fresh air module is running, the baffle of the air guide damper is located in the fresh air outlet channel and closes the fresh air outlet channel, and the fresh air from the fresh air module is blown out through the through holes on the fresh air cover.

[0019] Preferably, the middle frame is also provided with a fresh air diffusion groove, the fresh air inlet is located in the fresh air diffusion groove, the surrounding ribs are arranged around the fresh air diffusion groove, and the lower end of the surrounding ribs is open to connect the fresh air inlet and the fresh air outlet channel.

[0020] Preferably, the fresh air cover includes an arc-shaped portion and a fresh air cover body from top to bottom, with the arc-shaped portion and the fresh air cover body connected by a rounded transition. The upper end of the arc-shaped portion is provided with several buckles, and the lower end of the fresh air cover body is provided with several snap fasteners. The middle frame is provided with several slots corresponding to the buckles and several snap fastener grooves corresponding to the snap fasteners. The buckles of the fresh air cover are inserted into the slots of the middle frame, and the snap fasteners of the fresh air cover are snapped into the snap fastener grooves of the middle frame.

[0021] Preferably, the system also includes a panel, which is mounted on the middle frame, with the lower end of the fresh air cover flush with the lower end of the panel.

[0022] The present invention, by adopting the above technical solution, has the following beneficial effects: by setting an additional fresh air outlet channel at the bottom of the fresh air inlet, and by opening and closing the fresh air outlet channel through the opening and closing of the air guide damper; when the air guide damper is closed, the fresh air outlet channel is also in a closed state, which does not affect the appearance and eliminates the risk of dust and insects entering; when the air guide damper is open, the fresh air outlet channel is located below the fresh air cover, which does not affect the overall aesthetics. Combined with the fresh air control method in this application, users can obtain a larger fresh air volume while the speed of the fresh air fan is always lower than that of the main fan, and the noise level is controlled within a reasonable range, thereby improving the user experience. Attached Figure Description

[0023] Figure 1 This is the control logic diagram of the fresh air control method in this invention;

[0024] Figure 2 This is a schematic diagram of the structure of the air guide damper when it is closed in this invention;

[0025] Figure 3 This is a schematic diagram of the structure of the air guide damper when it is open in this invention;

[0026] Figure 4 yes Figure 3 A schematic diagram of the structure with the fresh air cover removed;

[0027] Figure 5 This is a structural diagram of the fresh air cover.

[0028] Figure 6 This is a schematic diagram of fresh air outlet when the air guide damper is closed in this invention;

[0029] Figure 7 This is a schematic diagram of fresh air outlet when the air guide damper is opened in this invention.

[0030] Figure label:

[0031] 1. Indoor unit body; 2. Middle frame; 21. Fresh air inlet; 22. Surrounding rib; 23. Fresh air diffuser; 24. Fresh air outlet channel; 25. Slot; 26. Clip slot; 27. Air conditioning outlet; 3. Fresh air cover; 31. Through hole; 32. Fresh air cover body; 321. Clip; 33. Curved part; 331. Plug; 4. Air guide damper; 41. Baffle rib; 42. Textured part; 5. Panel. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] 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.

[0037] For clarity, in this invention, when the indoor unit of an air conditioner is installed on the wall, the side closer to the wall is considered the inside or the rear, and vice versa, the side further away is considered the outside or the front.

[0038] like Figure 1 The method for controlling fresh air supply, as shown, includes the following steps: In cooling mode, the cooling fan speed settings are C1, C2, C3, ..., Cmax, and the fresh air fan is controlled within a second speed range b in this mode; in heating mode, the heating fan speed settings are H1, H2, H3, ..., Hmax, and the fresh air fan is controlled within a third speed range c in this mode; in ventilation mode, the ventilation fan speed settings are W1, W2, W3, ..., Wmax, and the fresh air fan is controlled within a fourth speed range d in this mode.

[0039] S1, when the fresh air function is turned on, detect whether the main fan is running;

[0040] S2, if it is determined that the main fan is not in operation and the air guide damper is in closed state, then control the speed of the fresh air fan to be in the first speed range a of a lower speed; if it is determined that the main fan is in operation and the air guide damper is in open state, then proceed to S3.

[0041] S3: Detects the operating mode of the fresh air conditioner and determines whether it is in cooling mode, heating mode, ventilation mode, or dehumidification mode;

[0042] S4: If the fresh air conditioner is determined to be in cooling mode, then the cooling fan speed of the main fan in cooling mode is detected, and the fresh air fan speed is controlled within the second speed range b, and the fresh air fan speed is controlled to be lower than the speed of the main fan fan speed. If the fresh air conditioner is determined to be in heating mode, then the heating fan speed of the main fan in heating mode is detected, and the fresh air fan speed is controlled within the third speed range c, and the fresh air fan speed is controlled to be lower than the speed of the main fan fan speed. If the fresh air conditioner is determined to be in ventilation mode, then the ventilation fan speed in ventilation mode is detected, and the fresh air fan speed is controlled within the fourth speed range d, and the fresh air fan speed is controlled to be lower than the speed of the main fan fan speed. If the fresh air conditioner is determined to be in dehumidification mode, then the fresh air function is turned off.

[0043] S5: When switching the main fan damper in the same operating mode of the fresh air conditioner, repeat S4; when switching the operating mode of the fresh air conditioner, repeat S3 and S4.

[0044] When the main fan is not running and the fresh air module is turned on alone, in order to reduce noise, the speed range of the fresh air fan should be controlled in a lower range, that is, the first speed range a is less than any of the second speed range b, the third speed range c, and the fourth speed range d.

[0045] According to actual needs, the first speed range a includes a1, a2 and a3, the second speed range b includes b1, b2 and b3, the third speed range c includes c1, c2 and c3, and the fourth speed range d includes d1, d2 and d3. Among them, a3 is the highest speed of the fresh air fan in cooling mode, b3 is the highest speed of the fresh air fan in heating mode, and c3 is the highest speed of the fresh air fan in ventilation mode.

[0046] When switching the main fan speed of the fresh air conditioner under the same operating mode, the speed of the fresh air fan will simultaneously switch to match the speed of the main fan speed, and the speed of the fresh air fan will be kept lower than that of the main fan speed. For example, if a user switches from cooling mode C1 + fresh air mode b1 to cooling mode C2, the fresh air speed will also be adjusted to b1 under cooling mode C2. That is, when increasing the main fan speed in the same mode, although the speed of the fresh air fan remains the same, the speed of the fresh air fan at that speed will increase accordingly, thereby obtaining a larger volume of fresh air without increasing noise. When decreasing the main fan speed in the same mode, although the speed of the fresh air fan remains the same, the speed of the fresh air fan at that speed will decrease accordingly, so that the sound of the fresh air outlet is always lower than that of the main fan, reducing noise.

[0047] like Figures 2 to 7 A fresh air conditioner, as shown, includes an indoor unit 1 and a middle frame 2, a fresh air module, a fresh air cover 3, an air guide 4, a controller, and a panel 5 mounted on the indoor unit 1. The panel 5 is mounted on the middle frame 2. The fresh air module is located behind the middle frame 2 and has a fresh air outlet. The middle frame 2 has a fresh air inlet 21 for exposing the fresh air outlet. The fresh air cover 3 is connected to the middle frame 2 and can cover the fresh air inlet 21. The fresh air cover 3 has multiple through holes 31. The middle frame 2 has a fresh air outlet channel 24 located below the fresh air inlet 21. Using the fresh air outlet control method described above, the controller is used to detect whether the main fan is running, detect the operating mode of the fresh air conditioner, detect the windshield of the main fan of the fresh air conditioner, and control the speed of the fresh air fan. The middle frame... The upper part of the frame 2 is also provided with a surrounding rib 22, which surrounds the fresh air inlet 21. The front end of the surrounding rib 22 abuts against the fresh air cover 3, and the lower end of the surrounding rib 22 is open to connect the fresh air inlet 21 with the fresh air outlet channel 24. The lower part of the middle frame 2 has an air conditioning outlet 27. The air guide door 4 is rotatably located below the middle frame 2 and can open or close the air conditioning outlet. A baffle 41 is provided on the side of the air guide door 4 near the fresh air cover 3. When the air guide door 4 is closed, the baffle 41 is located in the fresh air outlet channel 24 and can close the fresh air outlet channel 24.

[0048] like Figure 5 and Figure 6As shown, when the air guide damper 4 is open and the fresh air module is running, the fresh air from the fresh air module is blown out through the through hole 31 on the fresh air cover 3 and the lower end of the surrounding rib 22. The fresh air outlet channel 24 is located below the fresh air cover 3. This design does not affect the overall aesthetics, allowing users to obtain a larger volume of fresh air while reducing noise and abnormal sounds, thus keeping the noise level within a reasonable range and improving the user experience. When the air guide damper 4 is closed and the fresh air module is running, the baffle 41 of the air guide damper 4 is located inside the fresh air outlet channel 24 and closes the fresh air outlet channel 24. The fresh air from the fresh air module is blown out through the through hole 31 on the fresh air cover 3, which does not affect the appearance and eliminates the risk of dust and insects entering.

[0049] To further improve the smoothness of fresh air delivery and prevent fresh air from getting trapped inside the fresh air cover plate 3, a fresh air diffusion groove 23 is provided on the middle frame 2. The fresh air inlet 21 is located within the fresh air diffusion groove 23, and the surrounding rib 22 is arranged around the fresh air diffusion groove 23. The lower end of the surrounding rib 22 is open, thereby connecting the fresh air inlet 21 with the fresh air outlet channel 24. In this way, even when the air guide damper 4 is closed, fresh air can still diffuse from the fresh air inlet 21 into the fresh air diffusion groove 23 in a timely manner, and be blown out from the through hole 31 of the fresh air cover plate 3 directly opposite the fresh air diffusion groove 23, increasing the fresh air volume and reducing fresh air noise.

[0050] like Figure 3 and Figure 4 As shown, the fresh air cover 3 includes an arc-shaped part 33 and a fresh air cover body 32 from top to bottom. The arc-shaped part 33 and the fresh air cover body 32 are connected by an arc transition. The upper end of the arc-shaped part 33 is provided with several buckles 331, and the lower end of the fresh air cover body 32 is provided with several clips 321. The middle frame 2 is provided with several slots 25 corresponding to the buckles 331 and several clip grooves 26 corresponding to the clips 321. The buckles 331 of the fresh air cover 3 are inserted into the slots 25 of the middle frame 2, and the clips 321 of the fresh air cover 3 are clipped into the clip grooves 26 of the middle frame 2. To enhance the aesthetics of the air deflector 4 when it is open, the lower end of the fresh air cover 3 is flush with the lower end of the panel 5. To enhance the aesthetics of the air deflector 4 when it is closed, the air deflector 4 is also provided with a textured part 42. The pattern of the textured part 42 is naturally connected to the pattern formed by the through holes 31 on the fresh air cover 3, making the overall appearance more harmonious.

[0051] All features described in the specification, appended claims and drawings, whether individually or in any combination thereof, are essential features of this invention.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A method for controlling fresh air supply, applied to a fresh air air conditioner, the fresh air air conditioner comprising an indoor unit (1) and a middle frame (2), a fresh air module, a fresh air cover (3), a guide door (4), and a controller mounted on the indoor unit (1), wherein the fresh air module is located behind the middle frame (2), the fresh air module has a fresh air outlet, the middle frame (2) has a fresh air inlet (21) for exposing the fresh air outlet, the fresh air cover (3) is connected to the middle frame (2) and can cover the fresh air inlet (21), the fresh air cover (3) has multiple through holes (31), and the guide door (4) is rotatably positioned below the middle frame (2), characterized in that, The controller is used to detect whether the main fan is running, detect the operating mode of the fresh air conditioner, detect the windshield of the main fan of the fresh air conditioner, and control the speed of the fresh air fan. The middle frame (2) is provided with a fresh air outlet channel (24), which is located below the fresh air inlet (21). The middle frame (2) is also provided with a surrounding rib (22), which surrounds the fresh air inlet (21). The front end of the surrounding rib (22) abuts against the fresh air cover (3), and the lower end of the surrounding rib (22) is open to connect the fresh air inlet (21) and the fresh air outlet channel (24). The air guide door (4) is provided with a baffle (41). When the air guide door (4) is closed, the baffle (41) is located in the fresh air outlet channel (24) and can close the fresh air outlet channel (24). The fresh air conditioner has a cooling mode, a heating mode, and a ventilation mode. In the cooling mode, the cooling fan speed is set to C1, C2, C3, ..., Cmax, and the fresh air fan is controlled within the second speed range b in this mode. In the heating mode, the heating fan speed is set to H1, H2, H3, ..., Hmax, and the fresh air fan is controlled within the third speed range c in this mode. In the ventilation mode, the ventilation fan speed is set to W1, W2, W3, ..., Wmax, and the fresh air fan is controlled within the fourth speed range d in this mode. The control method includes the following steps: S1, when the fresh air function is turned on, detect whether the main fan is running; S2, if it is determined that the main fan is not in operation and the air guide damper is in closed state, then control the speed of the fresh air fan in the first speed range a; if it is determined that the main fan is in operation and the air guide damper is in open state, then proceed to S3. S3: Detects the operating mode of the fresh air conditioner and determines whether it is in cooling mode, heating mode, ventilation mode, or dehumidification mode; S4: If the fresh air conditioner is determined to be in cooling mode, then the cooling fan speed of the main fan in cooling mode is detected, and the fresh air fan speed is controlled within the second speed range b, and the fresh air fan speed is controlled to be lower than the speed of the main fan fan speed. If the fresh air conditioner is determined to be in heating mode, then the heating fan speed of the main fan in heating mode is detected, and the fresh air fan speed is controlled within the third speed range c, and the fresh air fan speed is controlled to be lower than the speed of the main fan fan speed. If the fresh air conditioner is determined to be in ventilation mode, then the ventilation fan speed in ventilation mode is detected, and the fresh air fan speed is controlled within the fourth speed range d, and the fresh air fan speed is controlled to be lower than the speed of the main fan fan speed. If the fresh air conditioner is determined to be in dehumidification mode, then the fresh air function is turned off. S5: When switching the main fan damper in the same operating mode of the fresh air conditioner, repeat S4; when switching the operating mode of the fresh air conditioner, repeat S3 and S4.

2. The fresh air outlet control method according to claim 1, characterized in that, The first speed range a is less than any one of the second speed range b, the third speed range c, and the fourth speed range d. The first speed range a includes a1, a2, and a3 gears. The second speed range b includes b1, b2, and b3 gears. The third speed range c includes c1, c2, and c3 gears. The fourth speed range d includes d1, d2, and d3 gears.

3. The fresh air outlet control method according to claim 2, characterized in that, When switching the main fan speed of the fresh air conditioner to the same operating mode, the speed of the fresh air fan is simultaneously switched to match the speed of the main fan speed, and the speed of the fresh air fan is controlled to be lower than the speed of the main fan speed.

4. A fresh air conditioner, employing a fresh air outlet control method as described in any one of claims 1-3, wherein when the air guide door (4) is open and the fresh air module is running, the fresh air from the fresh air module is simultaneously blown out through the through hole (31) on the fresh air cover (3) and the lower opening of the surrounding rib (22); when the air guide door (4) is closed and the fresh air module is running, the baffle (41) of the air guide door (4) is located in the fresh air outlet channel and closes the fresh air outlet channel, and the fresh air from the fresh air module is blown out through the through hole (31) on the fresh air cover (3).

5. A fresh air conditioning system according to claim 4, characterized in that, The middle frame (2) is also provided with a fresh air diffusion groove (23), the fresh air inlet (21) is located in the fresh air diffusion groove (23), the surrounding rib (22) is arranged around the fresh air diffusion groove (23), and the lower end of the surrounding rib (22) is open to connect the fresh air inlet (21) and the fresh air outlet channel (24).

6. A fresh air conditioning system according to claim 4, characterized in that, The fresh air cover (3) consists of an arc-shaped part (33) and a fresh air cover body (32) from top to bottom. The arc-shaped part (33) and the fresh air cover body (32) are connected by an arc transition. The upper end of the arc-shaped part (33) is provided with several buckles (331), and the lower end of the fresh air cover body (32) is provided with several clips (321). The middle frame (2) is provided with several slots (25) corresponding to the buckles (331) and several clip grooves (26) corresponding to the clips (321). The buckles (331) of the fresh air cover (3) are inserted into the slots (25) of the middle frame (2), and the clips (321) of the fresh air cover (3) are clipped into the clip grooves (26) of the middle frame (2).

7. A fresh air conditioning system according to claim 4, characterized in that, It also includes a panel (5), which is mounted on the middle frame (2), and the lower end of the fresh air cover (3) is flush with the lower end of the panel (5).

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