Air conditioner indoor unit and fresh air ventilator

Abstract

The utility model relates to an air conditioner indoor unit and a fresh air ventilator, the fresh air ventilator comprises a shell, the shell comprises a first side wall and a second side wall, the first side wall is provided with a fresh air inlet, and the second side wall is provided with a fresh air outlet; the filtering device is obliquely arranged in the shell; a fan assembly; the fresh air inlet is provided with a long axis, and the long axis of the fresh air inlet is basically parallel to the filtering device. According to the fresh air machine, the fresh air inlet is formed in the first side wall of the shell, the fresh air outlet is formed in the second side wall of the shell, and the long axis of the fresh air inlet is basically parallel to the filtering device obliquely arranged in the shell, so that the space on one side of the filtering device can be reasonably utilized, and the fresh air input can be increased on the basis of small size; according to the fresh air machine, the filter device is obliquely arranged, so that the layout of the filter device and the fan assembly can be optimized, the miniaturization design of the fresh air machine is facilitated, and then the fresh air machine can be conveniently connected with a duct type air conditioner of an indoor unit of the air conditioner.

Description

Technical Field

[0001] This utility model relates to the field of heating, ventilation and air conditioning, and in particular to indoor air conditioning units and fresh air systems. Background Technology

[0002] The fresh air units used in air conditioning indoor units are generally divided into central fresh air units and distributed fresh air units. Distributed fresh air units can integrate air conditioning indoor units with fresh air. Existing distributed fresh air units either do not have good pre-treatment effects, resulting in a certain temperature difference between the fresh air entering the room and the indoor circulating air of the air conditioner, thus leading to a poor user experience; or they are too large and inconvenient to connect and install with the duct unit of the air conditioning indoor unit. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an improved fresh air fan, and further to provide an improved air conditioning indoor unit.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a new air ventilator is also constructed, comprising:

[0005] The housing includes a first sidewall and a second sidewall, wherein a fresh air inlet is provided on the first sidewall and a fresh air outlet is provided on the second sidewall;

[0006] The filter device is inclinedly disposed inside the housing;

[0007] Wind turbine components;

[0008] The fresh air inlet has a long axis, and the long axis of the fresh air inlet is substantially parallel to the filter device.

[0009] In some embodiments, the first sidewall and the second sidewall are disposed opposite to each other, and the path of fresh air from the fresh air inlet to the fresh air outlet is Z-shaped; or

[0010] The first sidewall and the second sidewall are adjacent to and perpendicular to each other, and the path of fresh air from the fresh air inlet to the fresh air outlet is L-shaped.

[0011] In some embodiments, the fresh air inlet is waist-shaped, rectangular, or elliptical.

[0012] In some embodiments, a partition is also included, which divides the interior space of the housing into a first cavity and a second cavity;

[0013] The partition plate is provided with a connecting hole that connects the first cavity and the second cavity;

[0014] The filter device is disposed on the partition plate, and the horizontal projection of the filter device covers the connecting hole.

[0015] In some embodiments, a fixing frame is provided in the first cavity;

[0016] The fixing frame is disposed on the partition plate, and the fixing frame is used to support the filter device and facilitate the movement of the filter device.

[0017] In some embodiments, the filtration device includes a plurality of filtration device components stacked together.

[0018] In some embodiments, the first sidewall is further provided with a filter device maintenance port, which is configured for the filter device to be removed and placed.

[0019] In some embodiments, a support is provided in the second cavity, and the fan assembly is disposed on the support;

[0020] The fresh air unit further includes a first connecting structure, which connects and fixes the fan assembly to the partition; and / or, the fresh air unit further includes a second connecting structure, which connects and fixes the fan assembly to the bracket;

[0021] And / or, the fresh air unit further includes a cushioning pad disposed on the bracket and the fan assembly.

[0022] In some embodiments, the housing is provided with a cable outlet;

[0023] The bracket is provided with a lead wire channel communicating with the outlet, and the fan assembly has an electrical connection wire, which is led out from the lead wire channel and the outlet.

[0024] This utility model also relates to an indoor air conditioning unit, including a fresh air unit.

[0025] The following are the beneficial effects of implementing the air conditioner indoor unit and fresh air unit of this utility model: The fresh air unit sets a fresh air inlet on the first side wall of the casing and a fresh air outlet on the second side wall, and sets the long axis of the fresh air inlet basically parallel to the filter device that is inclinedly set in the casing. This can make reasonable use of the space on one side of the filter device, thereby increasing the fresh air input in a small volume and improving the user experience. The fresh air unit also optimizes the layout of the filter device and fan components by setting the filter device in an inclined manner, which is conducive to the miniaturization design of the fresh air unit and facilitates the connection of the fresh air unit with the air conditioning indoor unit duct unit. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0027] Figure 1This is a schematic diagram of the structure of the indoor unit of the air conditioner in some embodiments of this utility model;

[0028] Figure 2 yes Figure 1 The diagram shows the structure of the fresh air unit in the indoor unit of the air conditioner.

[0029] Figure 3 yes Figure 2 The diagram shows the structure of the fresh air unit from another angle.

[0030] Figure 4 yes Figure 2 A partial structural schematic diagram of the fresh air unit shown;

[0031] Figure 5 yes Figure 2 Another partial structural diagram of the fresh air unit shown;

[0032] Figure 6 yes Figure 2 A partial schematic diagram of the interior of the fresh air unit's casing is shown. Detailed Implementation

[0033] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0034] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" 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. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0035] Figure 1 An embodiment of the indoor unit of this air conditioner is shown. This indoor unit can be used for cooling and / or heating, and it can mix fresh air with indoor return air before exchanging heat and outputting the mixed air to meet user needs. This air conditioner has the advantages of easy installation and a high level of user experience.

[0036] like Figure 1 As shown, in some embodiments, the indoor unit of the air conditioner may include a body 200 and a fresh air unit 100. The body 200 is a ducted unit, and the fresh air unit 100 may be installed on one side of the body 200, which can input fresh air into the body 200. In this embodiment, the fresh air unit 100 may be miniaturized, thus facilitating its installation on the side of the body 200, achieving the mixing of fresh air and indoor circulating air to improve the user experience.

[0037] The unit 200 can be installed indoors. An air cavity and a heat exchange cavity can be formed inside the unit 200. The air cavity can communicate with a fresh air unit 100, which can input fresh air into the air cavity. A return air vent can be provided on the unit 200, which can communicate with the air cavity, allowing indoor return air to be input into the air cavity. The air cavity can be used for mixing fresh air and return air. A heat exchanger can be installed in the heat exchange cavity, which can communicate with the air cavity, for introducing and exchanging heat from the air in the air cavity. In some embodiments, an air conditioning side air outlet can also be provided on the unit 200, which can communicate with the heat exchange cavity and can face indoors, allowing heat-exchanged air to be output to the room.

[0038] like Figures 2 to 4 As shown, in some embodiments, the fresh air unit 100 may include a housing 10, a filter device 20, and a fan assembly 40. In some embodiments, the housing 10 may be used to mount the filter device 20 and the fan assembly 40. The filter device 20 may be tilted within the housing 10 for filtering fresh air input into the housing 10. In some embodiments, the filter device 20 may include a first end 20a and a second end 20b disposed opposite to each other. The fan assembly 40 may output the fresh air filtered by the filter device 20.

[0039] It should be noted that the specific meaning of "tilted setting" mentioned in this application is: the angle between the filter device and the first sidewall is not 0° or 90°.

[0040] In some embodiments, the housing 10 may be generally cuboid in shape. Of course, it is understood that in other embodiments, the housing 10 may not be limited to a cuboid shape, and may also be a cube or other shapes. In some embodiments, the housing 10 may be made of sheet metal. Of course, it is understood that in other embodiments, the housing 10 may not be limited to sheet metal, and may also be made of plastic.

[0041] In some embodiments, the housing 10 may include a first sidewall 11 and a second sidewall 12. The first sidewall 11 and the second sidewall 12 may be disposed opposite to each other, such as... Figures 2-5 In the illustrated embodiment, the first sidewall 11 and the second sidewall 12 serve as two parallel side surfaces of the housing 10. It is understood that in other embodiments, the first sidewall 11 and the second sidewall 12 can also serve as two adjacent side surfaces, such as the first sidewall serving as the top surface of the housing 10 and the second sidewall 12 serving as a side surface, which is equivalent to setting the fresh air inlet on the top surface.

[0042] In some embodiments, a first cavity 10a and a second cavity 10b may be defined between the first sidewall 11 and the second sidewall 12. The first cavity 10a and the second cavity 10b may be arranged side by side. The first cavity 10a may be used to house the filter device 20. The second cavity 10b may be used to house the fan assembly 40.

[0043] In some embodiments, the housing 10 may further include a third sidewall 13 and a fourth sidewall 14. The third sidewall 13 and the fourth sidewall 14 are disposed opposite to each other. The third sidewall 13 and the fourth sidewall 14 may be spaced apart between the first sidewall 11 and the second sidewall 12, and the third sidewall 13 and the fourth sidewall 14 may be spaced apart between the first sidewall 11 and the second sidewall 12. The third sidewall 13 and the fourth sidewall 14 may be arranged parallel to each other. The first cavity 10a and the second cavity 10b may be arranged sequentially from the third sidewall 13 to the fourth sidewall 14, that is, the first cavity 10a may be disposed close to the third sidewall 13, and the second cavity 10b may be disposed close to the fourth sidewall 14.

[0044] In some embodiments, the housing 10 may further include a fifth sidewall 15 and a sixth sidewall 16, which may be disposed opposite to and spaced apart from each other. The fifth sidewall 15 and the sixth sidewall 16 may be disposed in parallel. The fifth sidewall 15 and the sixth sidewall 16 may be disposed between the third sidewall 13 and the fourth sidewall 14.

[0045] In some embodiments, the first sidewall 11 can be connected and fixed to the third sidewall 13, fourth sidewall 14, fifth sidewall 15, and sixth sidewall 16 by means of a connecting component, which can be a screw-on component. In some embodiments, the connecting component may also be a snap-fit ​​component, not limited to a screw-on component. In some embodiments, the first sidewall 11 can also be fixed to the third sidewall 13, fourth sidewall 14, fifth sidewall 15, and sixth sidewall 16 by welding. The second sidewall 12 can be connected and fixed to the third sidewall 13, fourth sidewall 14, fifth sidewall 15, and sixth sidewall 16 by means of a connecting component, which can be a screw-on component. In some embodiments, the connecting component may also be a snap-fit ​​component, not limited to a screw-on component. In some embodiments, the second sidewall 12 can also be fixed to the third sidewall 13, fourth sidewall 14, fifth sidewall 15, and sixth sidewall 16 by welding.

[0046] In some embodiments, the housing 10 further includes a partition 17, which may be disposed between the third sidewall 13 and the fourth sidewall 14 to divide the internal space of the housing 10 into a first cavity 10a and a second cavity 10b. That is, the partition 17 may be disposed between the first cavity 10a and the second cavity 10b. The partition 17 may be connected and fixed to the fifth sidewall 15 and the sixth sidewall 16 by means of a connecting assembly. In some embodiments, the connecting assembly may be a screw-on assembly.

[0047] In some embodiments, a fresh air inlet 111 may be provided on the first sidewall 11. The fresh air inlet 111 may be located near the third sidewall 13 and may communicate with the first cavity 10a. The fresh air inlet 111 may be used to allow external fresh air to be input into the first cavity 10a. In some embodiments, the fresh air inlet may be longitudinally arranged in a direction perpendicular to the arrangement direction of the first cavity 10a and the second cavity 10b, that is, the fresh air inlet 111 may extend toward the fifth sidewall 15 and / or the sixth sidewall 16, thereby increasing the input of fresh air to the filter device 20 of the first cavity 10a, which is beneficial to improving the fresh air filtration efficiency.

[0048] In some embodiments, the fresh air inlet 111 has a long axis that is substantially parallel to the filter device 20. Generally, the shape with the long axis is roughly flat, meaning there is also a short axis perpendicular to the long axis. For example, in some embodiments, the fresh air inlet 111 may be waist-shaped (similar to an ellipse). Of course, it is understood that in other embodiments, the fresh air inlet 111 is not limited to being waist-shaped (similar to an ellipse), and it may also be rectangular or elliptical. In some embodiments, the long axis of the fresh air inlet 111 may be substantially parallel to the end face of the first end of the filter device 20. It should be noted that "substantially parallel" may refer to allowable manufacturing errors.

[0049] In some embodiments, the fresh air inlet 111 may include a first edge 111a and a second edge 111b, wherein the first edge 111a and the second edge 111b may be spaced apart along the arrangement direction of the first cavity 10a and the second cavity 10b. In some embodiments, the first edge 111a and the second edge 111b are arranged parallel and opposite to each other, with the first edge 111a located near the third sidewall 13 and the second edge 111b located near the fourth sidewall 14. The two ends of the first edge 111a and the second edge 111b may be located towards the fifth sidewall 15 and the sixth sidewall 16, respectively.

[0050] In some embodiments, the first sidewall 11 is further provided with a filter device maintenance port 112, which may be provided corresponding to the first end 20a of the filter device 20. The filter device maintenance port 112 may be configured to allow the filter device 20 to be removed and placed in. Generally, maintenance personnel can remove the filter device 20 for inspection through the filter device maintenance port 112, and then put the filter device 20 back in through the filter device maintenance port 112. The filter device maintenance port 112 may be covered by a cover 18, which is detachably provided on the first sidewall 11.

[0051] In some embodiments, a fresh air outlet 121 may be provided on the second sidewall 12. This fresh air outlet 121 may be located near the fourth sidewall 14 and may communicate with the second cavity 10b. In some embodiments, the path of fresh air from the fresh air inlet 111 to the fresh air outlet 121 may be Z-shaped. That is, the fresh air inlet 111 and the fresh air outlet 121 are arranged opposite each other, with the fresh air outlet 121 located near the fourth sidewall 14 and the fresh air inlet 111 located near the third sidewall 13. This arrangement helps to shorten the fresh air delivery path and facilitates the miniaturization of the entire fresh air unit. In some embodiments, the fresh air outlet 121 may be circular, square, or other shapes.

[0052] In some other embodiments, the first sidewall 11 and the second sidewall 12 are not limited to being arranged opposite each other. When the first sidewall 11 is adjacent to and perpendicular to the second sidewall 12, the path of fresh air from the fresh air inlet 111 to the fresh air outlet 121 is L-shaped.

[0053] In some embodiments, a connecting hole 171 may be provided on the partition 17, which can be used to connect the first cavity 10a and the second cavity 10b. In some embodiments, the connecting hole 171 may be provided at the central axis of the partition 17. In some embodiments, the connecting hole 171 may be a circular hole.

[0054] In some embodiments, the filter device 20 is disposed in the first cavity 10a and can be inclined toward the fresh air inlet 111, thereby ensuring the fresh air filtration effect while reducing the space occupied by the filter device 20, which is beneficial to the miniaturization design of the fresh air unit. The first end 20a of the filter device 20 can be close to the end of the second sidewall 12 away from the second cavity 10b, and the second end 20b can be located on the side of the second edge 111b away from the first edge 111a, that is, the angle between the direction perpendicular to the filter device 20 and the first sidewall 11 and / or the third sidewall 13 is not 90°. Specifically, the filter device can be inclined from the third sidewall 13 toward the second edge 111b of the fresh air inlet 111, and its second end 20b can be located below the second edge 111b. In some embodiments, the filter device 20 is disposed on the partition 17, and its horizontal projection can cover the connecting hole 171, thereby ensuring that the fresh air input from the fresh air inlet 111 can be filtered by it and then input into the fan assembly 40 of the second cavity 10b through the connecting hole 171.

[0055] In some embodiments, a mounting bracket 30 may be provided in the first cavity 10a. The mounting bracket 30 can be installed on the partition 17 and can be used to install and fix the filter device 20. In some embodiments, the mounting bracket 30 can be a cuboid structure and a hollow structure. The mounting bracket 30 is disposed on the outer periphery of the filter device 20, that is, the filter device 20 can be inclinedly disposed in the mounting bracket 30 and fixed by the mounting bracket 30. The mounting bracket 30 can be connected and fixed to the partition 17 by a connecting assembly. In some embodiments, the connecting assembly can be a screw-on assembly.

[0056] In some embodiments, the filtration device 20 may include multiple filtration device components stacked together. Generally, the filtration device 20 may include three filtration device components, such as a coarse filter, a medium-efficiency filter, and a high-efficiency filter. The coarse filter is used to filter dust particles larger than 5 μm, serving as a pre-filtration unit. The medium-efficiency filter is used to capture particulate dust and various suspended solids of 1-5 μm, preventing these contaminants from entering the downstream high-efficiency filter. The high-efficiency filter is used to capture particulate dust and various suspended solids larger than 0.5 μm, serving as a final filtration unit.

[0057] The mounting bracket 30 can be equipped with three parallel tracks arranged in a stacked manner. These three tracks can be used to install three filter device components: a coarse filter, a medium-efficiency filter, and a high-efficiency filter, respectively, which facilitates the movement of the filter devices. Each of the three filter device components can be correspondingly provided with a filter device maintenance port 112, through which the three filter device components can be inspected and maintained.

[0058] In some embodiments, the fan assembly 40 is disposed in the second cavity 10b, and the fan assembly 40 can communicate with the first cavity 10a and the fresh air outlet 121. The fan assembly 40 can be used to deliver filtered fresh air into the body 200. In some embodiments, the fan assembly 40 can be disposed opposite to and communicate with the connecting hole 171. In some embodiments, the fan assembly 40 may include a housing 41 and a rotating structure 42 disposed in the housing 41. In some embodiments, the fan assembly 40 may include a fan inlet 411 and a fan outlet 412, wherein the fan inlet 411 can communicate with the first cavity 10a through the connecting hole 171. The fan outlet 412 is disposed facing the fresh air outlet 121 and can communicate with the fresh air outlet 121. In some embodiments, the fresh air outlet 121 and the fan outlet 412 may be the same.

[0059] like Figure 5 and Figure 6 As shown, in some embodiments, a bracket 50 may be provided in the second cavity 10b, which can be used to support and fix the fan assembly 40. The bracket 50 can be installed and fixed on the fourth side wall 14. The bracket 50 can be made entirely of sheet metal. The bracket 50 may include a support plate 51, a first extension plate 52, a second extension plate 53, and a baffle 54. The support plate 51 may be arranged parallel to the fourth side wall 14, and may be disposed between the fourth side wall 14 and the partition 17, and spaced apart from the fourth side wall 14 and the partition 17. There may be two first extension plates 52, which may be disposed on two opposite sides of the support plate 51, and may be perpendicular to the support plate 51 and extend toward the fourth side wall 14. The second extension plate 53 may be disposed on the side of the first extension plate 52 away from the support plate 51, and may be bent relative to the first extension plate 52. The second extension plate 53 is arranged parallel to the fourth side wall 14 to fit against the fourth side wall 14. The second extension plate 53 can be connected and fixed to the fourth sidewall 14 by a connecting assembly. In some embodiments, the connecting assembly can be a screw-in assembly. In some embodiments, the baffle 54 can be disposed on the side of the support plate 51 facing the second sidewall 12 and can be disposed perpendicular to the support plate 51. The baffle 54 can extend toward the fourth sidewall 14. The support plate 51, the first extension plate 52, the second extension plate 53, and the baffle 54 define a hollow space.

[0060] In some embodiments, the housing 10 may be provided with a cable outlet 122, and the bracket 50 may be provided with a cable lead channel 55 communicating with the cable outlet 122. Specifically, the support plate 51 may be provided with a cable inlet 511, and the baffle 54 may be provided with a cable outlet 541. The cable inlet 511 and the cable outlet 541 are connected to form the cable lead channel 55. A cable guide ring is also provided at one of the top corners of the partition 17. The fan assembly 40 has an electrical connection wire, which can be led out sequentially from the cable lead channel 55, the cable guide ring of the partition, and the cable outlet 122, and then introduced into the duct fan control box.

[0061] In some embodiments, the fan assembly 40 can be fixed between the bracket 50 and the partition 17. In some embodiments, the fresh air unit may include a first connecting structure 60, which can be used to connect and fix the fan assembly 40 and the partition 17. In some embodiments, the first connecting structure 60 may include a screw-in assembly. A first connecting hole may be provided on the side of the housing 41 of the fan assembly 40 facing the partition 17, and a second connecting hole corresponding to the first connecting hole may be provided on the partition 17. The screw-in assembly may be installed at the first connecting hole and the second connecting hole to connect and fix the fan assembly 40 and the partition 17. In some embodiments, the fresh air unit may also include a second connecting structure, which connects and fixes the fan assembly 40 and the bracket 50. In some embodiments, the second connecting structure may include a screw-in assembly. A third connecting hole may be provided on the side of the housing 41 of the fan assembly 40 facing the fourth sidewall 14, and a fourth connecting hole may be provided on the support plate 51 of the bracket 50. The screw-in assembly may be installed at the third connecting hole and the fourth connecting hole to connect and fix the fan assembly 40 and the bracket 50. In some other embodiments, the new fan may include only the first connecting structure 60 or only the second connecting structure. The fan assembly 40 is connected and fixed to the partition 17 by the first connecting structure 60, and the fan assembly 40 is connected and fixed to the bracket 50 by the second connecting structure, thereby improving the stability of the fan assembly 40 and avoiding vibration and noise generated by the fan assembly 40 during operation.

[0062] In some embodiments, the fresh air unit may further include a cushioning pad disposed between the support 50 and the fan assembly 40, which can be used to reduce vibration of the fan assembly 40 and reduce noise. In some embodiments, the cushioning pad may be a silicone pad or a rubber pad. In other embodiments, the cushioning pad may be omitted.

[0063] After the indoor unit of the air conditioner is turned on, the outdoor fresh air enters the fresh air unit 100 through the fresh air inlet 111 and is purified by the filter device 20. The purified fresh air is then drawn into the air cavity of the unit 200 by the fan assembly 40 from the fan outlet 412 and the fresh air outlet 121. In the air cavity, the fresh air is mixed with the indoor return air from the return air vent. The fan in the unit 200 then guides the mixed air into the heat exchange chamber for heat exchange, and finally outputs it to the room from the air conditioner side outlet.

[0064] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A fresh air ventilator, characterized in that, include: The housing (10) includes a first sidewall (11) and a second sidewall (12), wherein a fresh air inlet (111) is provided on the first sidewall (11) and a fresh air outlet (121) is provided on the second sidewall (12); A filter device (20) is inclinedly disposed inside the housing; Fan assembly (40); The fresh air inlet (111) has a long axis, and the long axis of the fresh air inlet (111) is substantially parallel to the filter device (20).

2. The fresh air system according to claim 1, characterized in that, The first sidewall (11) and the second sidewall (12) are arranged opposite to each other, and the path of fresh air from the fresh air inlet (111) to the fresh air outlet (121) is Z-shaped; or The first sidewall (11) and the second sidewall (12) are adjacent to each other and perpendicular to each other, and the path of fresh air from the fresh air inlet (111) to the fresh air outlet (121) is L-shaped.

3. The fresh air system according to claim 1, characterized in that, The fresh air inlet (111) is waist-shaped, rectangular or oval.

4. The fresh air system according to claim 1, characterized in that, It also includes a partition (17) that divides the internal space of the housing (10) into a first cavity (10a) and a second cavity (10b); The partition (17) is provided with a connecting hole (171) that connects the first cavity (10a) and the second cavity (10b); The filter device (20) is disposed on the partition (17), and the horizontal projection of the filter device (20) covers the connecting hole (171).

5. The fresh air system according to claim 4, characterized in that, A fixing frame (30) is provided in the first cavity (10a); The fixing frame (30) is disposed on the partition (17), and the fixing frame (30) is used to support the filter device (20) and facilitate the movement of the filter device (20).

6. The fresh air system according to claim 4, characterized in that, The filtration device (20) includes multiple filtration device components, which are stacked together.

7. The fresh air system according to claim 1, characterized in that, The first sidewall (11) is also provided with a filter device maintenance port (112), which is configured to allow the filter device (20) to be placed or removed.

8. The fresh air system according to claim 4, characterized in that, A bracket (50) is provided in the second cavity (10b), and the fan assembly (40) is disposed on the bracket (50); The fresh air unit further includes a first connecting structure (60), which connects and fixes the fan assembly (40) and the partition (17); and / or, the fresh air unit further includes a second connecting structure, which connects and fixes the fan assembly (40) and the bracket (50); And / or, the fresh air unit further includes a cushioning pad disposed between the bracket (50) and the fan assembly (40).

9. The fresh air system according to claim 8, characterized in that, The housing (10) is provided with a cable outlet (122); The bracket (50) is provided with a lead wire channel (55) communicating with the outlet (122), and the fan assembly (40) has an electrical connection wire, which is led out from the lead wire channel (55) and the outlet (122).

10. An indoor unit for an air conditioner, characterized in that, Includes the fresh air unit as described in any one of claims 1 to 9.

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