Fresh air device and air conditioner

Abstract

The present application provides a fresh air device and an air conditioner, which relate to the field of air conditioning technology. In the filter assembly of the fresh air device, a strip-shaped first limiting portion is provided on the frame, and the first limiting portion extends on the inner side of the frame along the circumference of the frame, for abutting the windward surface of the filter element. Since the windward surface is inclined downward, and the strip-shaped first limiting portion has a relatively large support surface, when the fresh air function is not used, the first limiting portion can better support the edge of the filter element, so that the filter element is not easy to collapse or slide off the frame. Therefore, the filter element in the fresh air device provided in the embodiment of the present application has better stability. The air conditioner provided in the embodiment of the present application includes the above-mentioned fresh air device, and therefore also has corresponding beneficial effects.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a fresh air device and an air conditioner. Background Art

[0002] Air conditioners with a fresh air function need to filter the fresh air entering through the air inlet of the fresh air device. However, the filter arrangement of the existing fresh air module is not reasonable, resulting in poor filter stability. Summary of the Invention

[0003] The problem solved by the present application is how to improve the stability of the filter element in the fresh air device.

[0004] To solve the above problems, on the first aspect, the present application provides a fresh air device, which includes a shell, a fan and a filter assembly. An air duct is formed in the shell, and a fresh air inlet and a fresh air outlet connected to the air duct are opened on the surface of the shell. The fan and the filter assembly are arranged in the air duct, and the filter assembly is located between the fan and the fresh air inlet. The filter assembly includes a frame and a filter element. The frame forms a window for air flow to pass through, and the filter element is arranged on the inner side of the frame to filter the air flow passing through the window; the filter element has a windward surface and a leeward surface, the windward surface is inclined downward, and the leeward surface is inclined upward, and a first limiting portion and a second limiting portion are convexly provided on the inner side of the frame, the first limiting portion abuts the windward surface of the filter element, and the second limiting portion abuts the leeward surface of the filter element, and the first limiting portion is strip-shaped and extends along the circumference of the frame on the inner side of the frame.

[0005] In the filter assembly of the fresh air device provided in the embodiment of the present application, a strip-shaped first limiting portion is provided on the frame for the inclined filter element (the inclined setting is often to improve the posture of the filter element in the air duct to improve the utilization rate). The first limiting portion extends on the inner side of the frame along the circumference of the frame and is used to abut the windward surface of the filter element. Since the windward surface is inclined downward, when the fresh air function is not used, the filter element tends to collapse toward the side where the windward surface is located under the action of gravity. The strip-shaped first limiting portion has a relatively large support surface, so it can better support the edge of the filter element, making it less likely for the filter element to collapse or slide off the frame. It can be seen that the filter element in the fresh air device provided in the embodiment of the present application has better stability.

[0006] In an optional embodiment, at least two first limiting portions are provided within the frame, and the at least two first limiting portions are spaced apart along the circumference of the frame on the inner side of the frame. Dividing the first limiting portion into at least two sections and arranging them spaced apart along the circumference of the frame can more evenly support the filter element.

[0007] In an optional embodiment, the filter element is rectangular, and the frame includes two longitudinal arms spaced apart in the horizontal direction and two transverse arms spaced apart in the vertical direction. The two longitudinal arms and the two transverse arms together form a rectangular frame, and the first stop is disposed inside the longitudinal arms. In this embodiment, because the filter element is inclined relative to the vertical direction, it has a tendency to bend primarily in the longitudinal direction. The first stop is disposed inside the longitudinal arms, i.e., the first stop has a longitudinal extension. With this structure, the filter element is supported by the first stop, making it less susceptible to longitudinal bending.

[0008] In an optional embodiment, a third stopper is provided on the inner side of the frame, and is provided at the corner where the horizontal arm and the longitudinal arm meet to abut against the corner of the windward surface of the filter element. In this embodiment, supporting the corner can further increase the stability of the filter element.

[0009] In an optional embodiment, the two cross arms are an upper cross arm and a lower cross arm, respectively. The upper cross arm is positioned higher than the lower cross arm, and the side of the filter element abuts against the inner side of the lower cross arm. The side of the filter element connects the windward side and the leeward side in the thickness direction of the filter element. The lower cross arm is provided with a notch extending from the windward side to the leeward side of the frame, and a portion of the side of the filter element is exposed by the notch. Since the first strip-shaped limiting portion abuts against the windward side, thereby blocking a portion of the windward side, the utilization rate of the filter element is affected to a certain extent. In this embodiment, a notch is added to the lower cross arm, so that a portion of the side of the lower side of the filter element is exposed. This portion of the side exposed by the notch is connected to the windward side. By exposing this portion of the side, it can also be used for air intake, thereby expanding the effective filtering area of ​​the filter element and improving the utilization rate of the filter element to a certain extent.

[0010] In an optional embodiment, a plurality of second stoppers are spaced apart along the circumference of the frame on the inner side of the frame. The second stoppers are stopper protrusions, and the projections of the second stoppers and the first stoppers on the windward side of the filter element do not overlap. In this embodiment, the second stoppers are staggered from the first stoppers, enabling support at different locations on both sides of the filter element, thereby improving stability.

[0011] In an optional embodiment, the housing is further provided with an installation port, through which the filter assembly can be inserted into or removed from the housing. By providing the installation port, the insertion and removal of the filter assembly is achieved, making it easier to install, remove, and maintain the filter assembly.

[0012] In an optional embodiment, one of the housing and the frame is provided with a guide groove, and the other is provided with a guide portion, the guide portion and the guide groove being slidably engaged. By providing the guide groove and the guide portion, the filter assembly can be smoothly inserted from the installation opening into the assembly position during installation.

[0013] In an optional embodiment, one of the guide groove and the guide portion is provided with a spring catch, and the other is provided with a latching slot. When the filter assembly is inserted from the mounting opening into the assembly position, the spring catch engages with the latching slot. Once the filter assembly is in the assembly position, it is necessary to maintain stability to achieve the desired filtering effect. Therefore, the spring catch and the latching slot are provided to stabilize the filter assembly in the assembly position. Furthermore, the guide portion and the guide groove provide a sliding guide, allowing the spring catch to engage smoothly into the latching slot. The two sets of structures are compactly arranged, eliminating unnecessary space.

[0014] In an optional embodiment, the position of the fresh air inlet is lower than the position of the filter assembly.

[0015] In an optional embodiment, the fan is a centrifugal fan, and the rotation axis of the centrifugal fan passes through the window formed by the frame.

[0016] In an optional embodiment, the filter element is a HEPA filter.

[0017] In a second aspect, the present application provides an air conditioner comprising the fresh air device of any one of the aforementioned embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the assembly of a fresh air device in one embodiment of the present application;

[0019] Figure 2 This is an exploded view of a fresh air device in one embodiment of the present application;

[0020] Figure 3 This is a cross-sectional view of a fresh air device in one embodiment of the present application;

[0021] Figure 4 This is a schematic diagram of a frame in an embodiment of the present application at a first viewing angle;

[0022] Figure 5 This is a schematic diagram of a frame in an embodiment of the present application at a second viewing angle;

[0023] Figure 6 for Figure 3 A magnified view of the local VI.

[0024] Explanation of the accompanying drawings: 010-fresh air device; 100-housing; 101-fresh air inlet; 102-fresh air outlet; 103-installation port; 110-first volute; 120-second volute; 121-guide part; 130-end cover; 200-fan; 300-filter assembly; 310-frame; 311-longitudinal arm; 312-first limiting part; 313-upper cross arm; 314-lower cross arm; 315-notch; 316-second limiting part; 317-third limiting part; 318-guide groove; 319-spring buckle; 320-lifting part; 330-filter element. DETAILED DESCRIPTION

[0025] Air conditioners with fresh air function often have a fresh air device added to the main body of the air conditioner. At present, filters are usually set in the fresh air device to reduce particulate matter (such as dust) in the gas entering the room through the fresh air device. In some cases, in order to make the filter better face the airflow, improve utilization and filtering effect, the filter will be set to be inclined according to the shape of the air duct. For example, if the air inlet is relatively low, the windward side of the filter will be tilted downward, that is, towards the direction of the incoming wind. However, when the fresh air device is not activated, the inclined filter is at risk of collapsing due to its own gravity. If the filter collapses or even shifts from its original position, it will affect the filtering effect and reduce the user experience. In existing fresh air devices, the inclined filter has poor stability and is prone to collapse or even fall off due to insufficient support.

[0026] To improve the problem of poor stability of the filter element in the fresh air device in the prior art, the present invention provides a fresh air device in which the stability of the filter element is improved by improving the limit portion supporting the filter element. In addition, the present invention also provides an air conditioner including the fresh air device.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the assembly of the fresh air device 010 in one embodiment of the present application; Figure 2 This is an exploded view of the fresh air device 010 in one embodiment of the present application; Figure 3 This is a cross-sectional view of a fresh air device 010 in one embodiment of the present application. Figures 1 to 3 As shown, fresh air device 010 includes a housing 100, a fan 200, and a filter assembly 300. An air duct is formed within housing 100, with a fresh air inlet 101 and a fresh air outlet 102 formed on the surface of housing 100. Fresh air inlet 101 connects to the outside of the house, while fresh air outlet 102 connects to the inside of the house. Fan 200 and filter assembly 300 are disposed within the air duct, with filter assembly 300 positioned between fan 200 and fresh air inlet 101 along the direction of air flow.

[0029] In this embodiment, the housing 100 includes a first volute 110, a second volute 120 and an end cover 130, which together form an air duct. Furthermore, the fan 200 is a centrifugal fan 200, which has the characteristics of axial air inlet and radial air outlet. In this embodiment, the first volute 110 and the second volute 120 together form a cavity for accommodating the fan 200, and also together form an air duct and a fresh air outlet 102 downstream of the fan 200 (based on the direction of gas flow); the second volute 120 and the end cover 130 together form a cavity for accommodating the filter assembly 300.

[0030] In this embodiment, the first volute 110, the second volute 120, and the end cover 130 are arranged sequentially in the direction of extension of the rotation axis of the fan 200 and are connected by a snap-fit ​​structure. It should be understood that in other optional embodiments, the first volute 110, the second volute 120, and the end cover 130 can be detachably connected by fasteners such as screws.

[0031] Specifically, in this embodiment, the fresh air inlet 101 and the fresh air outlet 102 are both located at the lower portion of the housing 100, with the fresh air outlet 102 being located lower than the filter assembly 300. The filter assembly 300 and the fan 200 are horizontally opposed, with the axis of the fan 200 extending horizontally and passing through the filter assembly 300.

[0032] Furthermore, in the present embodiment, a mounting port 103 is provided on the shell 100, and the filter assembly 300 can be inserted into or pulled out of the shell 100 through the mounting port 103. By providing the mounting port 103, the insertion and removal of the filter assembly 300 can be achieved, which facilitates the loading and unloading and maintenance of the filter assembly 300. After the filter assembly 300 is inserted into the assembly position from the mounting port 103, a portion of the filter assembly 300 (the lifting portion 320 on the frame 310) is exposed from the mounting port 103, which is convenient for the user or installer to grab. The entire mounting port 103 is located at a relatively upper position of the shell 100, higher than the fresh air inlet 101 and the fresh air outlet 102, and the mounting port 103 is surrounded by the end cover 130 and the second volute 120.

[0033] In an embodiment of the present application, the filter assembly 300 includes a frame 310 and a filter element 330 arranged in the frame 310. The frame 310 forms a window for air flow to pass through. The rotation axis of the centrifugal fan 200 passes through the window formed by the frame 310. The filter element 330 is arranged on the inner side of the frame 310 to filter the air flow passing through the window.

[0034] Figure 4 This is a schematic diagram of the frame 310 in a first viewing angle in one embodiment of the present application; Figure 5 This is a schematic diagram of the frame 310 in a second viewing angle in one embodiment of the present application. Figure 4 、 Figure 5 As shown, in this embodiment, the frame 310 is a rectangular frame, which includes two longitudinal arms 311 spaced apart in the horizontal direction and two transverse arms spaced apart in the vertical direction. The two longitudinal arms 311 and the two transverse arms together form the rectangular frame 310.

[0035] A lifting portion 320 is provided on the outer side of one longitudinal arm 311 , which facilitates users or installers to grab the filter assembly 300 and facilitates the installation and removal of the filter assembly 300 .

[0036] In the embodiment of the present application, the filter element 330 has a windward surface and a leeward surface. When the fresh air device 010 is normally assembled, the windward surface is tilted downward and the leeward surface is tilted upward. Figure 3 A first limiting portion 312 and a second limiting portion 316 are convexly provided on the inner side of the frame 310. The first limiting portion 312 abuts against the windward side of the filter element 330, and the second limiting portion 316 abuts against the leeward side of the filter element 330. The first limiting portion 312 is strip-shaped and extends along the circumference of the frame 310 on the inner side of the frame 310.

[0037] In the fresh air device 010 provided in the embodiment of the present application, the air flow enters from the fresh air inlet 101, then flows upward, then flows horizontally to the fan 200, and then is sent out from the fresh air outlet 102 along the radial direction of the fan 200 (such as Figure 3 (As shown by the straight arrow in the middle). The filter element 330 is arranged upstream of the fan 200 in an inclined posture so that the windward surface is better oriented towards the incoming wind direction, which is beneficial to improving the filtering effect. Regarding the inclined filter element 330. A strip-shaped first limiting portion 312 is provided on the frame 310. The first limiting portion 312 extends along the circumference of the frame 310 on the inner side of the frame 310 and is used to abut the windward surface of the filter element 330. Since the windward surface is inclined downward, when the fresh air function is not used, the filter element 330 tends to collapse toward the side where the windward surface is located under the action of gravity. The strip-shaped first limiting portion 312 has a relatively large support surface, so it can better support the edge of the filter element 330, making it less likely for the filter element 330 to collapse or slide off the frame 310. It can be seen that the filter element 330 in the fresh air device 010 provided in the embodiment of the present application has better stability.

[0038] Furthermore, the first limiting portion 312 is disposed on the inner side of the longitudinal arm 311. In this embodiment, since the filter element 330 is inclined relative to the vertical direction (the angle can be selected to be 10° to 30°), it has a tendency to bend longitudinally. The first limiting portion 312 is disposed on the inner side of the longitudinal arm 311, that is, the first limiting portion 312 has a longitudinal extension. With this structure, the filter element 330 is supported by the first limiting portion 312, making it less likely to bend longitudinally.

[0039] In this embodiment, at least two first limiting portions 312 are provided in the frame 310. The at least two first limiting portions 312 are spaced apart along the circumference of the frame 310 on the inner side of the frame 310, so as to more evenly support the filter element 330. Specifically, in this embodiment, two first limiting portions 312 are provided on each of the two longitudinal arms 311. No first limiting portions 312 are provided on either of the two transverse arms. This is because if too many first limiting portions 312 are provided on the two transverse arms, the windward surface of the filter element 330 may be excessively blocked, resulting in a decrease in utilization. Moreover, the strip-shaped first limiting portions 312 provided on the transverse arms are less effective in resisting the bending of the filter element 330 than the first limiting portions 312 provided on the longitudinal arms 311.

[0040] In this embodiment, the second limiting portion 316 is a limiting protrusion that is smaller than the first limiting portion 312. Specifically, its circumferential dimension of the frame 310 is smaller than that of the first limiting portion 312, thereby maximizing the utilization of the filter element 330 and facilitating the installation and fixation of the filter element 330. In this embodiment, because the second limiting portion 316 is smaller than the first limiting portion 312, the filter element 330 is installed into the frame 310 from the side where the second limiting portion 316 is located. In this embodiment, multiple second limiting portions 316 are arranged at intervals along the circumference of the frame 310 on the inner side of the frame 310. The second limiting portions 316 are limiting protrusions, and their projections on the windward surface of the filter element 330 do not overlap with those of the first limiting portion 312. In this embodiment, the second limiting portion 316 and the first limiting portion 312 are staggered and can provide support at different positions on the two surfaces of the filter element 330, thereby improving the stability of the filter element 330. Specifically, a second limiting portion 316 is provided on the inner side of each of the two transverse arms and the inner side of each of the two longitudinal arms 311. Since the filter element 330 has a certain thickness, the positions of the first limiting portion 312 and the second limiting portion 316 are spaced apart in the direction in which the airflow passes through the frame 310 (that is, in the axial direction of the fan 200). It should be understood that in other optional embodiments, the shape of the second limiting portion 316 can also be set to a strip shape, and the number of the first limiting portion 312 and the second limiting portion 316 can be increased or decreased as needed.

[0041] In this embodiment, a third stopper 317 is protruding from the inner side of the frame 310. This stopper 317 is located at the corner where the transverse arm and the longitudinal arm 311 meet, abutting the windward corner of the filter element 330. In this embodiment, supporting the corner further enhances the stability of the filter element 330. Furthermore, two third stoppers 317 are provided in this embodiment, one at each end of the lower transverse arm 314. Furthermore, each of the two third stoppers 317 is connected to the first stopper 312.

[0042] In this embodiment, the filter element 330 is a HEPA filter (High efficiency particulate airFilter). The filter element 330 has a certain thickness, and the side of the filter element 330 connects the windward side and the leeward side in the thickness direction of the filter element 330. The two cross arms in this embodiment are the upper cross arm 313 and the lower cross arm 314. The upper cross arm 313 is higher than the lower cross arm 314, and the side of the filter element 330 abuts against the inner side of the lower cross arm 314. A notch 315 is provided on the lower cross arm 314, which is opened from the windward side to the leeward side of the frame 310. A part of the side of the filter element 330 is exposed by the notch 315. It should be understood that the windward side of the frame 310 is the side facing the incoming wind direction, and the leeward side is the opposite side. Figure 3 In the embodiment, the windward side of the frame 310 is the right side of the frame 310, and the leeward side of the frame 310 is the left side of the frame 310. In this embodiment, since a strip-shaped first limiting portion 312 is provided to abut the windward surface and thus block a portion of the windward surface, the utilization rate of the filter element 330 will be affected to a certain extent. In this embodiment, a notch 315 is added to the lower cross arm 314, so that a portion of the side surface of the lower side of the filter element 330 is exposed. This portion of the side surface exposed by the notch 315 is connected to the windward surface, and by exposing this portion of the side surface, it can also be used for air intake, so that the effective filtering area of ​​the filter element 330 is expanded, and the utilization rate of the filter element 330 is improved to a certain extent. Figure 4 As can be seen in the figure, the width of the position where the notch 315 is provided on the lower cross arm 314 is smaller than that of other positions where the notch 315 is not provided. It should be noted that in order to ensure the filtering effect, the notch 315 should not be too deep to avoid the gap between the lower cross arm 314 and the filter element 330, which would cause some airflow to not pass through the filter element 330 and directly enter the downstream of the filter assembly 300.

[0043] In this embodiment, one of the housing 100 and the frame 310 is provided with a guide groove 318, and the other is provided with a guide portion 121. The guide portion 121 slides in engagement with the guide groove 318. The provision of the guide groove 318 and the guide portion 121 allows the filter assembly 300 to be smoothly inserted into the assembly position from the mounting opening 103 during installation. Specifically, the outer sides of the upper cross arm 313 and the lower cross arm 314 of the frame 310 are each provided with a guide groove 318, and the housing 100 is provided with a guide portion 121 corresponding to each of the two guide grooves 318.

[0044] After the filter assembly 300 is inserted into the assembly position, the filter assembly 300 needs to be kept stable to achieve the desired filtering effect. Therefore, a spring buckle 319 and a card slot are provided to stabilize the filter assembly 300 in the assembly position. Figure 6 for Figure 3 An enlarged view of a local VI. Figure 6 As shown, one of the housing 100 and the frame 310 is optionally provided with a snap 319, and the other is provided with a slot (not shown). When the filter assembly 300 is inserted from the mounting opening 103 into the assembly position, the snap 319 engages with the slot. Specifically, in this embodiment, two snaps 319 are provided on the upper cross arm 313 and the lower cross arm 314, respectively, specifically in the guide slot 318 (sidewall or bottom of the slot). Correspondingly, two slots are provided on the inner side of the housing 100, specifically in the guide portion 121. Of course, in other optional embodiments, the positions of the snap 319 and the slot can be reversed. In this embodiment, the snap 319 can be partially embedded in the slot under the action of elastic force, and the snap 319 can also be deformed and disengaged from the slot when the frame 310 is pulled by an external force. The guide portion 121 and the guide slot 318 slide together to guide the snap 319, allowing it to smoothly engage the slot. The two sets of structures are compactly arranged, not occupying excess space.

[0045] In addition, embodiments of the present application also provide an air conditioner (not shown), comprising an air conditioner body and the fresh air device 010 described in the above embodiments of the present application. The air conditioner body is used to perform at least the basic temperature control function of the air conditioner, and the fresh air device 010 is used to draw outdoor air into the room to maintain fresh indoor air. This air conditioner can be a wall-mounted air conditioner.

[0046] In summary, in the filter assembly 300 of the fresh air device 010 provided in the embodiment of the present application, a first strip-shaped stopper 312 is provided on the frame 310 to support the inclined filter element 330. The first stopper 312 extends along the circumference of the frame 310 on the inner side of the frame 310 and is configured to abut the windward surface of the filter element 330. Because the windward surface is tilted downward, when the fresh air function is not in use, the filter element 330 tends to collapse toward the windward surface under the action of gravity. However, the first strip-shaped stopper 312, because it has a relatively large support surface, can better support the edge of the filter element 330, making it less likely to collapse or slide off the frame 310. Therefore, the filter element 330 in the fresh air device 010 provided in the embodiment of the present application has excellent stability. The air conditioner provided in the embodiment of the present application includes the above-mentioned fresh air device 010 and thus also has corresponding beneficial effects.

[0047] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims.

Claims

1. A fresh air device, characterized in that: The fresh air device (010) comprises a housing (100), a fan (200) and a filter assembly (300), an air duct is formed in the housing (100), a fresh air inlet (101) and a fresh air outlet (102) communicating with the air duct are provided on the surface of the housing (100), the fan (200) and the filter assembly (300) are arranged in the air duct, the filter assembly (300) is located between the fan (200) and the fresh air inlet (101), the filter assembly (300) comprises a frame (310) and a filter element (330), the frame (310) forms a window for air flow to pass through, the window (330) is provided with a filter element (330), and the filter element (330) is provided with a filter element (330). The filter element (330) is arranged on the inner side of the frame (310) to filter the airflow passing through the window; the filter element (330) has a windward surface and a leeward surface, the windward surface is inclined downward, and the leeward surface is inclined upward; a first limiting portion (312) and a second limiting portion (316) are convexly provided on the inner side of the frame (310); the first limiting portion (312) abuts against the windward surface of the filter element (330), and the second limiting portion (316) abuts against the leeward surface of the filter element (330); the first limiting portion (312) is strip-shaped and extends along the circumference of the frame (310) on the inner side of the frame (310); At least two sections of the first limiting portions (312) are provided in the frame (310), and the at least two sections of the first limiting portions (312) are arranged at intervals along the circumference of the frame (310) on the inner side of the frame (310); The filter element (330) is rectangular, and the frame (310) comprises two longitudinal arms (311) spaced apart in the horizontal direction and two transverse arms spaced apart in the vertical direction. The two longitudinal arms (311) and the two transverse arms together form the rectangular frame (310), and the first limiting portion (312) is arranged on the inner side of the longitudinal arms (311); A third limiting portion (317) is also protruded from the inner side of the frame (310), and the third limiting portion (317) is arranged at the connecting corner of the transverse arm and the longitudinal arm (311) to abut against the corner of the windward surface of the filter element (330); The two transverse arms are an upper transverse arm (313) and a lower transverse arm (314), respectively. The upper transverse arm (313) is positioned higher than the lower transverse arm (314). The side surface of the filter element (330) abuts against the inner side of the lower transverse arm (314). The side surface of the filter element (330) connects the windward surface and the leeward surface in the thickness direction of the filter element (330). The lower transverse arm (314) is provided with a notch (315) extending from the windward side to the leeward side of the frame (310), and a portion of the side surface of the filter element (330) is exposed by the notch (315).

2. The fresh air device according to claim 1, characterized in that: A plurality of second limiting portions (316) are arranged at intervals along the circumference of the frame (310) on the inner side of the frame (310), the second limiting portions are limiting protrusions, and the projections of the second limiting portions and the first limiting portions on the windward surface of the filter element do not overlap.

3. The fresh air device according to claim 1, characterized in that: The housing (100) is further provided with a mounting opening (103), and the filter assembly (300) can be inserted into the housing (100) or withdrawn from the housing (100) through the mounting opening (103).

4. The fresh air device according to claim 3, characterized in that: One of the shell (100) and the frame (310) is provided with a guide groove (318), and the other is provided with a guide portion (121), and the guide portion (121) is slidably engaged with the guide groove (318).

5. The fresh air device according to claim 4, characterized in that: One of the guide groove (318) and the guide portion (121) is provided with a spring buckle (319), and the other is provided with a clamping slot. When the filter assembly (300) is inserted from the installation opening (103) to the assembly position, the spring buckle (319) is engaged with the clamping slot.

6. The fresh air device according to claim 1, characterized in that: The position of the fresh air inlet (101) is lower than the position of the filter assembly (300).

7. The fresh air device according to claim 1, characterized in that: The fan (200) is a centrifugal fan (200), and the rotation axis of the centrifugal fan (200) passes through a window formed by the frame (310).

8. The fresh air device according to claim 1, characterized in that: The filter element (330) is a HEPA filter.

9. An air conditioner, characterized in that: Comprising the fresh air device (010) according to any one of claims 1 to 8.

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