Fresh air module, air conditioner indoor unit and fresh air air conditioner

Abstract

The application provides a fresh air module, an air conditioner indoor unit and a fresh air conditioner. The fresh air module comprises an air inlet assembly and a fan assembly. The air inlet assembly comprises a fresh air pipe and an air inlet cavity. The air inlet cavity is divided into a first passage, a second passage and a third passage. The third passage and the first passage are respectively located on the two sides of the second passage and communicate with the second passage, and form an "M" shaped air flow passage. The fresh air pipe communicates with the second passage. The fan assembly comprises a volute and a centrifugal fan arranged in the volute. The air inlet of the volute communicates with the air inlet cavity. The fresh air module of the application stabilizes the flow of the air flow introduced from the fresh air pipe through the "M" shaped air flow passage, improves the air flow state in the air inlet cavity, reduces the air flow loss caused by the direct impact of the air flow on the side wall of the air inlet cavity, and reduces the mixing loss caused by the interaction of the inlet air flow, thereby improving the fresh air volume and improving the user experience.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and in particular relates to a fresh air module, an air conditioner indoor unit and a fresh air air conditioner. BACKGROUND

[0002] With the improvement of living standards, people have higher and higher requirements for indoor air quality. Fresh air air conditioners are increasingly favored by consumers because they can realize indoor and outdoor air circulation. However, due to the limitations of overall size and other factors, the existing fresh air air conditioners have the problem of insufficient fresh air volume, which affects the user experience. SUMMARY

[0003] The embodiments of the present application provide a fresh air module, an air conditioner indoor unit and a fresh air air conditioner to solve the problem of insufficient fresh air volume of the existing fresh air air conditioner.

[0004] In a first aspect, the embodiments of the present application provide a fresh air module, which comprises an air inlet assembly and a fan assembly. The air inlet assembly comprises a fresh air pipe and an air inlet cavity. The air inlet cavity is divided into a first passage, a second passage and a third passage. The third passage and the first passage are respectively located on both sides of the second passage and communicate with the second passage, and form an "M" shaped air flow passage. The fresh air pipe communicates with the second passage. The fan assembly comprises a volute and a centrifugal fan arranged in the volute. The air inlet of the volute communicates with the air inlet cavity.

[0005] Optionally, two guide vanes are arranged in the air inlet cavity. The two guide vanes are arranged in a radial direction of the outlet of the fresh air pipe. The two guide vanes divide the air inlet cavity into the first passage, the second passage and the third passage.

[0006] Optionally, the two guide vanes are both arc-shaped structures, and the bending directions of the two guide vanes are opposite. Alternatively, the guide vane comprises a flat section close to the fresh air pipe and an arc-shaped section away from the fresh air pipe, and the bending directions of the arc-shaped sections of the two guide vanes are opposite.

[0007] Optionally, one end of the guide vane away from the fresh air pipe is bifurcated and extends into a first guide portion and a second guide portion. The distal ends of the first guide portion and the second guide portion are connected by a connecting portion.

[0008] The first guide portion, the second guide portion and the connecting portion are all arc-shaped structures, and the bending directions of the first guide portion, the second guide portion and the connecting portion of the same guide vane are the same.

[0009] Optionally, the guide vane has an inner guide surface and an outer guide surface, the inner guide surfaces of the two guide vanes are oppositely arranged, the outer guide surfaces of the two guide vanes are oppositely arranged, and the inner guide surface is tangent to the outer wall surface of the outlet of the fresh air pipe.

[0010] Optionally, the air inlet cavity has a first side wall opposite to the outlet of the fresh air pipe, and the first side wall is provided with a first guide member; the first guide member has two arc-shaped guide surfaces, and the two arc-shaped guide surfaces are recessed in the direction of the outside of the air inlet cavity, so that the first guide member is arranged in the shape of "M".

[0011] Optionally, the connecting point of the two arc-shaped guide surfaces is located on the central axis of the outlet of the fresh air pipe.

[0012] Optionally, the first passage and the third passage are each provided with a second guide member that extends in a curved manner towards the air inlet end of the centrifugal fan.

[0013] Optionally, the air inlet cavity includes a first side wall, a second side wall, a third side wall and a fourth side wall connected in sequence, the first side wall and the third side wall are oppositely arranged, the second side wall and the fourth side wall are oppositely arranged, and the third side wall is provided with a fresh air inlet communicated with the outlet of the fresh air pipe; the first side wall and the second side wall are connected through an arc-shaped transition, the second side wall and the third side wall, the third side wall and the fourth side wall, and the fourth side wall and the first side wall are connected through arc-shaped surfaces protruding in an arc-shaped manner towards the outside of the air inlet cavity.

[0014] Optionally, the arc-shaped surface is a circular arc surface, and the bending direction of the circular arc surface is the same as the rotation direction of the centrifugal fan.

[0015] In a second aspect, the embodiments of the present application further provide an air conditioner indoor unit, which includes the above-mentioned fresh air module.

[0016] In a third aspect, the embodiments of the present application further provide an air conditioner, which includes an air conditioner outdoor unit and the above-mentioned air conditioner indoor unit, and the air conditioner indoor unit is connected with the air conditioner outdoor unit through a refrigerant pipe.

[0017] In the technical scheme provided in the application, the fresh air module comprises an air inlet assembly and a fan assembly, the air inlet assembly comprises a fresh air pipe and an air inlet cavity, the air inlet cavity is divided into a first passage, a second passage and a third passage, the third passage and the first passage are respectively located on the two sides of the second passage and communicate with the second passage to form an "M"-shaped air flow passage, the fresh air pipe communicates with the second passage to introduce outdoor air into the air inlet cavity, the air flow introduced from the fresh air pipe is stably divided into each position of the air inlet cavity through the "M"-shaped air flow passage and then is sucked into the air inlet cavity by the fan assembly, the air flow flowing state in the air inlet cavity is improved, the air flow loss caused by the direct impact of the air flow on the side wall of the air inlet cavity is reduced, the mixing loss caused by the interaction of the air inlet air flow is reduced, the fresh air volume is improved, and then the user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, on the premise of not creating labor, can also obtain other drawings according to these drawings. In the following description, the same reference signs represent the same parts.

[0019] Figure 1 The exploded structural schematic diagram of the fresh air module provided in the embodiment of the application.

[0020] Figure 2 The first structural schematic diagram of the air inlet cavity provided in the embodiment of the application.

[0021] Figure 3 The structural schematic diagram of another view of the air inlet cavity. Figure 2

[0022] Figure 4 The second structural schematic diagram of the air inlet cavity provided in the embodiment of the application.

[0023] Figure 5 The structural schematic diagram of another view of the air inlet cavity. Figure 4

[0024] Figure 6 The cross-sectional schematic diagram of the air inlet cavity. Figure 4

[0025] Explanation of reference signs:

[0026] ​​​100, Fresh air module; 101, First passage; 102, Second passage; 103, Third passage; 110, Fresh air pipe; 120, Fresh air cavity; 121, First side wall; 122, Second side wall; 123, Third side wall; 124, Fourth side wall; 125, Fresh air inlet; 210, Centrifugal fan; 220, Volute; 221, First volute; 222, Second volute; 320, Guide vane; 321, First guide part; 322, Second guide part; 323, Connecting part; 410, First guide member; 411, Arc-shaped guide surface; 420, Second guide member; 500, Connecting member; 501, Arc-shaped surface; 600, Filtering device. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like is the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “multiple” is two or more, unless otherwise specifically limited.

[0029] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The term "and / or" includes any and all combinations of one or more of the associated listed items. The following description is presented to enable any person skilled in the art to practice the application as claimed. In the following description, for purposes of explanation, specific details are set forth to provide a thorough understanding of the application. It will be apparent to one skilled in the art, however, that the application can be practiced without using these specific details. In other instances, well-known structures and processes are not elaborated in order not to obscure the description of the application with unnecessary details. Thus, the present application is not intended to be limited by the embodiments shown, but is to be accorded with the widest scope consistent with the principles and features disclosed.

[0030] The embodiment of the present application provides a fresh air module 100, as shown in the drawings, the fresh air module 100 comprises an air inlet assembly and a fan assembly, the air inlet assembly comprises a fresh air pipe 110 and an air inlet cavity 120; the fan assembly comprises a volute 220 and a centrifugal fan 210 arranged in the volute 220, an air inlet of the volute 220 is communicated with the air inlet cavity 120; wherein the air inlet cavity 120 is divided into a first passage 101, a second passage 102 and a third passage 103, the third passage 103 and the first passage 101 are respectively located on two sides of the second passage 102 and communicated with the second passage 102, the first passage 101, the second passage 102 and the third passage 103 form an "M" shaped air flow passage, the fresh air pipe 110 is communicated with the second passage 102. Figures 1-6

[0031] It can be understood that the fresh air module 100 is used for being installed on an air conditioner indoor unit to provide fresh air for the indoor. Wherein one end of the fresh air pipe 110 is communicated with a fresh air inlet 125 of the air inlet cavity 120, the fresh air inlet 125 is communicated with the second passage 102, and the other end of the fresh air pipe 110 is communicated with the outdoor; the air inlet of the volute 220 is communicated with the air inlet cavity 120. When the fresh air module 100 is started, the centrifugal fan 210 generates suction, outdoor air enters the air inlet cavity 120 through the fresh air pipe 110, the centrifugal fan 210 inhales the air from the outdoor in the air inlet cavity 120, and discharges from an air outlet of the volute 220.

[0032] ​The fresh air module 100 provided by the embodiment of the present application comprises the air inlet assembly and the fan assembly, the air inlet assembly comprises the fresh air pipe 110 and an air inlet cavity 120 in communication with the fresh air pipe 110, the air inlet cavity 120 is divided into a first passage 101, a second passage 102 and a third passage 103, the third passage 103 and the first passage 101 are respectively located on two sides of the second passage 102 and are in communication with the second passage 102 to form an "M" shaped air flow passage, the fresh air pipe 110 is in communication with the second passage 102 to introduce outdoor air into the air inlet cavity 120, the air flow introduced from the fresh air pipe 110 is stably divided into different positions of the air inlet cavity through the "M" shaped air flow passage and then is sucked by the fan assembly, the air flow state in the air inlet cavity 120 is improved, the air flow loss caused by the direct impact of the air flow on the side wall of the air inlet cavity 120 is reduced, the mixing loss caused by the interaction of the air inlet air flow is reduced, the fresh air volume is improved, and the user experience is improved.

[0033] Specifically, in the embodiment of the present application, the "M" shaped air flow passage is used for stably dividing the air flow introduced from the fresh air pipe 110, and the air flow introduced from the fresh air pipe 110 can form a pre-rotation air flow after being divided by the "M" shaped air flow passage. It can be understood that the air flow entering the air inlet cavity 120 from the fresh air pipe 110 is a straight air flow, the straight air flow is forced to pre-rotate to generate a pre-rotation air flow through the "M" shaped air flow passage; then the pre-rotation air flow is converted into a rotating air flow by the working of the centrifugal fan 210, the air flow is stably divided into different positions of the air inlet cavity, and the space of the air inlet cavity 120 is fully utilized, so that the flow loss of the air flow in the air inlet cavity 120 is reduced.

[0034] In some embodiments of the present application, as shown in Figures 2-6 The air inlet cavity 120 is divided into the first passage 101, the second passage 102 and the third passage 103 by the two guide vanes 320.

[0035] Optionally, the two guide vanes 320 are both arc-shaped structures, and the bending directions of the two guide vanes 320 are opposite, and the second passage 102 is defined between the two guide vanes 320.

[0036] It can be understood that the airflow entering the air inlet cavity 120 from the fresh air pipe 110 is a straight airflow, and the two arc-shaped guide vanes 320 change the direction of the straight airflow and forcibly pre-rotate the straight airflow to generate a pre-rotated airflow. Specifically, the two guide vanes 320 are curved in opposite directions to form a spade-shaped structure. When the airflow of the fresh air pipe 110 enters the air inlet cavity 120, the straight airflow is divided into two rotating airflows through the guidance of the two arc-shaped guide vanes 320, thereby forming a pre-rotated airflow, thereby reducing the airflow loss caused by the impact of the side wall of the air inlet cavity 120.

[0037] Alternatively, the guide vanes 320 can also include a flat section close to the fresh air pipe 110 and an arc-shaped section away from the fresh air pipe 110, and the curved directions of the arc-shaped sections of the two guide vanes 320 are opposite. It can be understood that the airflow entering the air inlet cavity 120 from the fresh air pipe 110 is a straight airflow, and the straight airflow is divided into two rotating airflows through the guidance of the arc-shaped sections of the two guide vanes 320, thereby forming a pre-rotated airflow, thereby reducing the airflow loss caused by the impact of the side wall of the air inlet cavity 120.

[0038] Specifically, the guide vanes 320 have inner guide surfaces and outer guide surfaces, the inner guide surfaces of the two guide vanes 320 are oppositely arranged, the outer guide surfaces of the two guide vanes 320 are oppositely arranged, and the inner guide surfaces are tangent to the outer wall surface of the outlet of the fresh air pipe 110. That is, the inner guide surfaces of the two guide vanes 320 are tangent to the outer wall surface of the outlet of the fresh air pipe 110, so that the airflow can be better guided to the middle and rear sections of the "M"-shaped airflow passage of the air inlet cavity 120, thereby improving the airflow into the volute 220 and the working efficiency of the centrifugal fan 210. The air inlet cavity 120, so as to improve the fresh air volume of the fresh air module 100 and improve the user experience.

[0039] It should be noted that part of the airflow is sucked into the fan assembly soon after entering the second passage, and the remaining airflow is guided to the middle and rear sections of the "M"-shaped airflow passage by the guidance of the air inlet cavity, and then is sucked into the fan assembly, thereby forming a stable airflow distribution path in the air inlet cavity. The fan assembly sucks the airflow at different positions, thereby improving the airflow volume sucked by the fan assembly at the same time.

[0040] In some embodiments of the present application, as Figures 4-6As shown, the guide vanes 320 diverge from one end of the fresh air pipe 110 and extend into first guide portions 321 and second guide portions 322, both of which are connected by connecting portions 323 at their distal ends; the first guide portions 321, the second guide portions 322 and the connecting portions 323 are all arc-shaped structures, and the bending directions of the first guide portions 321, the second guide portions 322 and the connecting portions 323 of the same guide vane 320 are the same. In this way, the airflow can flow along the first guide portions 321, the connecting portions 323 and the second guide portions 322 in turn, so that the airflow is more effectively split and introduced into the two sides of the air inlet cavity 120 by the two guide vanes 320, thereby reducing the airflow loss caused by the direct impact of the airflow on the side wall of the air inlet cavity 120, and also guiding the airflow on both sides of the air inlet cavity 120 into the volute 220 to do work, thereby increasing the fresh air volume and improving the user experience.

[0041] Specifically, in the same guide vane 320, the first guide portion 321 near one end of the fresh air pipe 110 is connected to the second guide portion 322 near one end of the fresh air pipe 110, and the other end of the first guide portion 321 and the other end of the second guide portion 322 are bent in the same direction and connected by the connecting portion 323; the bending directions of the first guide portions 321, the second guide portions 322 and the connecting portions 323 of different guide vanes 320 are opposite. For example, as shown in Figure 5 As shown, the first guide portion 321, the second guide portion 322 and the connecting portion 323 of one guide vane 320 (i.e., the upper guide vane 320 in the figure) are all bent in the clockwise direction, and the first guide portion 321, the second guide portion 322 and the connecting portion 323 of the other guide vane 320 (i.e., the lower guide vane 320 in the figure) are all bent in the counterclockwise direction. Figure 5 As shown, the first guide portion 321, the second guide portion 322 and the connecting portion 323 of one guide vane 320 (i.e., the upper guide vane 320 in the figure) are all bent in the clockwise direction, and the first guide portion 321, the second guide portion 322 and the connecting portion 323 of the other guide vane 320 (i.e., the lower guide vane 320 in the figure) are all bent in the counterclockwise direction. Figure 5 As shown, the first guide portion 321, the second guide portion 322 and the connecting portion 323 of one guide vane 320 (i.e., the upper guide vane 320 in the figure) are all bent in the clockwise direction, and the first guide portion 321, the second guide portion 322 and the connecting portion 323 of the other guide vane 320 (i.e., the lower guide vane 320 in the figure) are all bent in the counterclockwise direction.

[0042] In some embodiments of the present application, as shown in Figures 4-6As shown, the air inlet cavity 120 has a first side wall 121 opposite to the outlet of the fresh air pipe 110, and the first side wall 121 is provided with a first flow guide 410; the first flow guide 410 has two arc-shaped flow guide surfaces 411, and the two arc-shaped flow guide surfaces are recessed towards the outside of the air inlet cavity 120, so that the first flow guide 410 is arranged in the shape of "M". By arranging the first flow guide 410 on the first side wall 121 of the air inlet cavity 120, the two arc-shaped flow guide surfaces 411 of the first flow guide 410 can divide the airflow rushing towards the first side wall 121 into two airflows, and guide the two airflows to the left and right sides of the air inlet cavity 120, so as to reduce the airflow loss caused by the airflow directly impacting the first side wall 121 of the air inlet cavity 120, thereby further improving the fresh air volume and improving the user experience.

[0043] Preferably, the two arc-shaped flow guide surfaces 411 are both circular arc-shaped flow guide surfaces, so that the divided fluid can be better guided to the left and right sides of the air inlet cavity 120.

[0044] Optionally, the connecting point of the two arc-shaped flow guide surfaces 411 is located on the center axis of the outlet of the fresh air pipe 110, so that the divided fluid can be better guided to the left and right sides of the air inlet cavity 120. For example, Figures 4-6 As shown, the two arc-shaped flow guide surfaces 411 of the first flow guide 410 are connected to form an "M"-shaped flow guide structure, and the two arc-shaped flow guide surfaces 411 are both circular arc-shaped flow guide surfaces, and the middle of the "M"-shaped flow guide structure is a flow dividing cone tip, which is located on the center axis of the outlet of the fresh air pipe 110.

[0045] As shown, Figure 5 and Figure 6 As shown, the first passage 101 and the third passage 103 are both provided with a second flow guide 420 extending towards the air inlet end of the centrifugal fan 210. By arranging the two second flow guides 420, the airflow in the first passage 101 and the third passage 103 can be guided to the air inlet end of the centrifugal fan 210, so that the air inlet efficiency is improved, thereby improving the fresh air volume.

[0046] In some embodiments of the present application, as shown, Figures 2-6As shown, the air inlet cavity 120 comprises a first side wall 121, a second side wall 122, a third side wall 123 and a fourth side wall 124 connected in sequence, the first side wall 121 is arranged opposite to the third side wall 123, the second side wall 122 is arranged opposite to the fourth side wall 124, and the third side wall 123 is provided with a fresh air inlet 125 in communication with the outlet of the fresh air pipe 110; the first side wall 121 and the second side wall 122 are arc-shaped transition, the second side wall 122 and the third side wall 123, the third side wall 123 and the fourth side wall 124 and the fourth side wall 124 and the first side wall 121 are connected by the arc-shaped surface 501 which is arc-shaped protruding outward of the air inlet cavity 120. In this way, the airflow separation flow loss in the air inlet cavity 120 can be reduced, and the fresh air volume of the fresh air module 100 can be improved.

[0047] Specifically, as shown in the drawings, Figures 2-6 As shown, the connection between the first side wall 121 and the second side wall 122, the connection between the second side wall 122 and the third side wall 123, the connection between the third side wall 123 and the fourth side wall 124 and the connection between the fourth side wall 124 and the first side wall 121 are all provided with a connecting piece 500, the connecting piece 500 has an arc-shaped surface 501 which is arc-shaped protruding outward of the air inlet cavity 120; the first side wall 121 and the second side wall 122 are connected by the arc-shaped surface 501 of the first connecting piece 500, the second side wall 122 and the third side wall 123 are connected by the arc-shaped surface 501 of the second connecting piece 500, the third side wall 123 and the fourth side wall 124 are connected by the arc-shaped surface 501 of the third connecting piece 500, and the fourth side wall 124 and the first side wall 121 are connected by the arc-shaped surface 501 of the fourth connecting piece 500.

[0048] Optionally, the arc-shaped surface 501 is a circular arc surface, and the bending direction of the circular arc surface is the same as the rotation direction of the centrifugal fan 210. In this way, the airflow separation flow loss in the air inlet cavity 120 can be more effectively reduced, and the fresh air volume of the fresh air module 100 can be further improved.

[0049] As shown in the drawings, Figure 1As shown, the volute 220 includes a first volute 221 and a second volute 222 connected with the first volute 221, the first volute 221 and the second volute 222 enclosing a containing space, and the centrifugal fan 210 is arranged in the containing space; the first volute 221 is provided with an air inlet communicated with the air inlet cavity 120, and the second volute 222 is provided with an air outlet. When the fresh air module 100 is started, the centrifugal fan 210 generates suction, outdoor air enters the air inlet cavity 120 through the fresh air pipe 110, and the centrifugal fan 210 sucks the air in the air inlet cavity 120 into the air inlet on the first volute 221 and discharges it from the air outlet on the second volute 222.

[0050] In some embodiments of the present application, as Figure 1 As shown, the air inlet cavity 120 and the volute 220 can also be provided with a filter device 600 at the connection position, so as to filter the fresh air before being delivered to the indoor space to meet the needs of different users.

[0051] The present application also provides an air conditioner indoor unit, which comprises the fresh air module 100, and the specific structure of the fresh air module 100 is as described above. Since the air conditioner indoor unit adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0052] The present application also provides an air conditioner, which comprises an air conditioner outdoor unit and an air conditioner indoor unit, and the air conditioner indoor unit is connected with the air conditioner outdoor unit through a refrigerant pipe. The specific structure of the air conditioner indoor unit is as described above. Since the fresh air air conditioner adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. In the above-mentioned embodiments, the description of each embodiment is focused on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0053] The above describes the fresh air module, the air conditioner indoor unit and the fresh air air conditioner provided by the embodiments of the present application in detail. The principles and implementation manners of the present application are described by applying specific examples, and the above-mentioned embodiment descriptions are only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed, and the above-mentioned description should not be understood as a limitation of the present application.

Claims

1. A fresh air module, characterized in that, The fresh air module (100) includes: The air intake assembly includes a fresh air duct (110) and an air intake cavity (120). The air intake cavity (120) is provided with two guide vanes (320) arranged radially at intervals along the outlet of the fresh air duct (110). The two guide vanes (320) divide the air intake cavity (120) into a first passage (101), a second passage (102), and a third passage (103). The third passage (103) and the first passage (101) are located on both sides of the second passage (102) and communicate with the second passage (102), forming an "M"-shaped airflow passage. The fresh air duct (110) is connected to the second passage (102). The air inlet cavity (120) has a first sidewall (121) opposite to the outlet of the fresh air duct (110). The first sidewall (121) is provided with a first guide (410). The first guide (410) has two arc-shaped guide surfaces (411). The two arc-shaped guide surfaces are recessed in the direction of the outer side of the air inlet cavity (120) so that the first guide (410) is arranged in an "M" shape. The fan assembly includes a volute (220) and a centrifugal fan (210) disposed within the volute (220), wherein the air inlet of the volute (220) is connected to the air inlet chamber (120).

2. The fresh air module according to claim 1, characterized in that, Both guide vanes (320) are arc-shaped structures, and the two guide vanes (320) have opposite bending directions; Alternatively, the guide vane (320) may include a straight section near the fresh air duct (110) and an arc-shaped section away from the fresh air duct (110), and the arc-shaped sections of the two guide vanes (320) may bend in opposite directions.

3. The fresh air module according to claim 1 or 2, characterized in that, The guide vane (320) forks at one end away from the fresh air duct (110) and extends into a first guide section (321) and a second guide section (322), and the extended ends of the first guide section (321) and the second guide section (322) are connected by a connecting section (323). The first guide portion (321), the second guide portion (322), and the connecting portion (323) are all arc-shaped structures, and the first guide portion (321), the second guide portion (322), and the connecting portion (323) of the same guide plate (320) have the same bending direction.

4. The fresh air module according to claim 2, characterized in that, The guide vane (320) has an inner guide surface and an outer guide surface. The inner guide surfaces of the two guide vanes (320) are arranged opposite to each other, and the outer guide surfaces of the two guide vanes (320) are arranged opposite to each other. The inner guide surface is tangent to the outer wall surface of the outlet of the fresh air duct (110).

5. The fresh air module according to claim 1, characterized in that, The connection point of the two arc-shaped guide surfaces (411) is located on the central axis of the outlet of the fresh air duct (110).

6. The fresh air module according to any one of claims 1 to 2 and 5, characterized in that, Both the first passage (101) and the third passage (103) are provided with a second guide (420) that bends and extends toward the air inlet of the centrifugal fan (210).

7. The fresh air module according to claim 6, characterized in that, The air inlet cavity (120) includes a first side wall (121), a second side wall (122), a third side wall (123), and a fourth side wall (124) connected in sequence. The first side wall (121) is arranged opposite to the third side wall (123), the second side wall (122) is arranged opposite to the fourth side wall (124), and the third side wall (123) is provided with a fresh air inlet (125) that communicates with the outlet of the fresh air duct (110). The arc transition between the first sidewall (121) and the second sidewall (122), the second sidewall (122) and the third sidewall (123), the third sidewall (123) and the fourth sidewall (124), and the fourth sidewall (124) and the first sidewall (121) are all connected by an arc-shaped surface (501) that arc-shapedly protrudes outward from the air inlet cavity (120).

8. The fresh air module according to claim 7, characterized in that, The arc-shaped surface (501) is a circular arc surface, and the bending direction of the circular arc surface is the same as the rotation direction of the centrifugal fan (210).

9. An indoor unit for an air conditioner, characterized in that, The indoor unit of the air conditioner includes the fresh air module (100) as described in any one of claims 1 to 8.

10. An air conditioner, characterized in that, The air conditioner includes an outdoor unit and an indoor unit as described in claim 9, wherein the indoor unit and the outdoor unit are connected by a refrigerant pipe.

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