CN216521991U

CN216521991U - Fresh air device and air conditioner

Info

Publication number: CN216521991U
Application number: CN202123115281.XU
Authority: CN
Inventors: 尚彬; 俞旭; 林盖; 商竹贤; 张引
Original assignee: Aux Air Conditioning Co Ltd; Ningbo Aux Electric Co Ltd
Current assignee: Aux Air Conditioning Co Ltd; Ningbo Aux Electric Co Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-05-13
Anticipated expiration: 2031-12-10

Abstract

The application provides a new trend device and air conditioner relates to air conditioner technical field. Among the fresh air device's the filtering component, set up the first spacing portion of banding in the framework, first spacing portion extends along the circumference of framework in the inboard of framework for the butt filters the windward side of piece. Because the windward side slope is down, and banding first spacing portion is because of having relatively great holding surface, consequently does not use under the condition of new trend function, and first spacing portion can support the limit portion of filtering the piece better for it is difficult to sink or from the framework landing to filter the piece. Therefore, the filter element in the fresh air device provided by the embodiment of the application has better stability. The air conditioner that this application embodiment provided includes foretell new trend device, consequently also has corresponding beneficial effect.

Description

Fresh air device and air conditioner

Technical Field

The application relates to the technical field of air conditioners, in particular to a fresh air device and an air conditioner.

Background

The air conditioner with the fresh air function needs to filter fresh air entering from an air inlet of a fresh air device. But the filter screen setting mode of current new trend module is reasonable inadequately, leads to the poor stability of filter screen.

SUMMERY OF THE UTILITY MODEL

The problem that this application was solved is how to improve the stability of filtering piece among the new trend device.

In order to solve the problems, in a first aspect, the application provides a fresh air device which comprises a shell, a fan and a filtering component, wherein an air channel is formed in the shell, a fresh air inlet and a fresh air outlet which are communicated with the air channel are formed in the surface of the shell, the fan and the filtering component are arranged in the air channel, the filtering component is positioned between the fan and the fresh air inlet, the filtering component comprises a frame body and a filtering piece, the frame body is enclosed into a window through which air flows pass, and the filtering piece is arranged on the inner side of the frame body so as to filter the air flows which pass through the window; filter and have windward side and leeward side, windward side slope down, leeward side slope up, the inboard protruding portion of being equipped with of framework first spacing portion and the spacing portion of second, the windward side of filter is filtered in first spacing portion butt, and the leeward side of filter is filtered in the spacing portion butt of second, and first spacing portion is the strip and extends along the circumference of framework in the inboard of framework.

In the filter assembly of new trend device that this application embodiment provided, to the filter piece that the slope set up (the slope sets up often for improving the gesture of filtering in the wind channel, comes the increase of utilization ratio), set up banding first spacing portion in the framework, first spacing portion extends along the circumference of framework in the inboard of framework for the windward side of butt filter piece. Because the windward side slope is down, consequently under the condition that does not use new trend function, filter the trend that has one side collapse of windward side place under the action of gravity, and the banding first spacing portion is because of having relatively great holding surface, so can support the limit portion of filtering the piece better for filter is difficult to collapse or from the framework landing. Therefore, the filter element in the fresh air device provided by the embodiment of the application has better stability.

In an optional embodiment, at least two sections of first limiting parts are arranged in the frame body, and the at least two sections of first limiting parts are arranged at intervals along the circumferential direction of the frame body on the inner side of the frame body. The first limiting part is at least two sections and is arranged along the circumferential direction of the frame body at intervals, so that the filtering piece can be supported more uniformly.

In an alternative embodiment, the filter member is rectangular, the frame body comprises two longitudinal arms arranged at intervals in the horizontal direction and two transverse arms arranged at intervals in the vertical direction, the two longitudinal arms and the two transverse arms together form a rectangular frame body, and the first limiting part is arranged on the inner side of the longitudinal arms. In this embodiment, since the filter member is inclined to the vertical direction, there is a tendency to bend in the longitudinal direction, and the first position-limiting portion is disposed inside the trailing arm, that is, the first position-limiting portion has a longitudinal extension, and the filter member is supported by the first position-limiting portion of this structure, so that the filter member is not easily bent in the longitudinal direction.

In an alternative embodiment, a third limiting part is further convexly arranged on the inner side of the frame body, and the third limiting part is arranged at a connecting corner of the transverse arm and the longitudinal arm so as to abut against a corner of the windward side of the filter element. In this embodiment, support the corner, can further increase the stability of filtering.

In an alternative embodiment, the two cross arms are an upper cross arm and a lower cross arm respectively, the upper cross arm is higher than the lower cross arm, the side surface of the filter element abuts against the inner side of the lower cross arm, the side surface of the filter element is connected with the windward side and the leeward side in the thickness direction of the filter element, a notch formed from the windward side to the leeward side of the frame body is arranged on the lower cross arm, and a part of the side surface of the filter element is exposed by the notch. Because the strip-shaped first limiting part is arranged to abut against the windward side, part of the windward side is blocked, and the utilization rate of the filter piece can be influenced to a certain degree. In this embodiment, the lower cross arm is additionally provided with a notch, so that a part of the side surface of the lower side of the filter element is exposed. The side face exposed by the notch is connected with the windward side, and the side face can be used for air inlet through exposure, so that the effective filtering area of the filtering piece is expanded, and the utilization rate of the filtering piece is improved to a certain extent.

In an optional embodiment, the plurality of second limiting parts are arranged at intervals along the circumferential direction of the frame body on the inner side of the frame body, the second limiting parts are limiting lugs, and the projections of the second limiting parts and the first limiting parts on the windward side of the filter piece are not overlapped. In this embodiment, the second spacing portion and the first spacing portion are staggered, can support in the different positions on two faces of filtering piece, have improved stability.

In an alternative embodiment, the housing is further provided with a mounting opening through which the filter assembly can be inserted into or withdrawn from the housing. Through setting up the installing port, realize filtering component's insertion and take out, the loading and unloading, the maintenance of filtering component of being convenient for.

In an alternative embodiment, one of the housing and the frame is provided with a guide groove, and the other is provided with a guide portion which is slidably fitted with the guide groove. Through setting up guide way and guide part for filter component can insert the assembly position from the installing port smoothly when the installation.

In an alternative embodiment, one of the guide groove and the guide part is provided with a snap fastener, and the other is provided with a clamping groove, and when the filter assembly is inserted into the assembling position from the mounting opening, the snap fastener is in clamping fit with the clamping groove. After the filter assembly is inserted into the assembly position, the filter assembly needs to be kept stable to play due filtering effect, and therefore the elastic buckle and the clamping groove are arranged to stabilize the filter assembly at the assembly position. And the guide part is in sliding fit with the guide groove for the elastic buckle is smoothly clamped into the clamping groove, and the two groups of structures are compact in arrangement and do not occupy redundant space.

In an alternative embodiment, the fresh air inlet is located lower than the filter assembly.

In an alternative embodiment, the fan is a centrifugal fan, the axis of rotation of which passes through a window formed in the frame.

In an alternative embodiment, the filter is a HEPA filter.

In a second aspect, the present application provides an air conditioner comprising the fresh air device of any of the preceding embodiments.

Drawings

FIG. 1 is a schematic view of an assembly of a fresh air device according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of a fresh air device according to an embodiment of the present application;

FIG. 3 is a cross-sectional view of a fresh air device according to an embodiment of the present application;

FIG. 4 is a schematic view of a frame shown from a first perspective in one embodiment of the present application;

FIG. 5 is a schematic view of a frame from a second perspective in one embodiment of the present application;

fig. 6 is an enlarged view of a portion VI in fig. 3.

Description of reference numerals: 010-a fresh air device; 100-a housing; 101-a fresh air inlet; 102-a fresh air outlet; 103-a mounting port; 110-a first volute; 120-a second volute; 121-a guide; 130-an end cap; 200-a fan; 300-a filter assembly; 310-a frame body; 311-trailing arm; 312-a first stop; 313-an upper cross arm; 314-lower crossbar; 315-gap; 316-second limiting part; 317-a third limit part; 318-guide groove; 319-snap; 320-a pulling part; 330-filter element.

Detailed Description

An air conditioner with a fresh air function is usually provided with a fresh air device additionally arranged on an air conditioner main body. Currently, a filter element is usually disposed in the fresh air device to reduce particulate matters (such as dust) in the air entering the room through the fresh air device. In some cases, in order to make the filter member better face the air flow, improve the utilization rate and the filtering effect, the filter member is arranged to be inclined according to the shape of the air duct. For example, if the air inlet is located relatively low, the windward side of the filter element is inclined downward, i.e. in the direction of the incoming wind. But the filter piece that the slope set up when the new trend device does not launch, because self gravity reason has the risk of collapsing down, if the filter piece that appears collapses down even shift from the original position, can influence the filter effect, lead to user experience to descend. And among the current new trend device, the filter stability that the slope set up is not good, filters the risk that collapses or even drops because of supporting not enough to appear easily.

In order to improve the not good problem of filter piece stability in the new trend device among the above-mentioned prior art, this application embodiment provides a new trend device, through improving the spacing portion that supports filter piece to improve the stability of filtering the piece. In addition, this application embodiment still provides an air conditioner that contains above-mentioned new trend device.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below.

Fig. 1 is a schematic view illustrating an assembly of a fresh air device 010 according to an embodiment of the present disclosure; fig. 2 is an exploded view of a fresh air device 010 according to an embodiment of the present application; fig. 3 is a cross-sectional view of a fresh air device 010 according to an embodiment of the present disclosure. As shown in fig. 1 to 3, the fresh air device 010 includes a housing 100, a blower 200, and a filter assembly 300. An air duct is formed in the casing 100, and a fresh air inlet 101 and a fresh air outlet 102 which are communicated with the air duct are formed in the surface of the casing 100. The fresh air inlet 101 is used for being communicated with the outside, and the fresh air outlet 102 is used for being communicated with the inside. The fan 200 and the filter assembly 300 are disposed in the air duct, and the filter assembly 300 is located between the fan 200 and the fresh air inlet 101 along the air flowing direction.

In the present embodiment, the housing 100 includes a first volute 110, a second volute 120, and an end cover 130, which together define an air duct. Further, the fan 200 is a centrifugal fan 200, which has the characteristics of axial air inlet and radial air outlet. In the present embodiment, the first volute 110 and the second volute 120 together define a cavity for accommodating the fan 200, and also together form an air duct and a fresh air outlet 102 downstream (with respect to the gas flowing direction) of the fan 200; together, the second volute 120 and the end cover 130 define a cavity for receiving the filter assembly 300.

In the present embodiment, the first volute 110, the second volute 120 and the end cover 130 are sequentially arranged in the extending direction of the rotation axis of the fan 200, and are connected by a snap structure. It should be appreciated that in alternative embodiments, the first volute 110, the second volute 120, and the end cover 130 may be removably coupled to one another via fasteners, such as screws.

Specifically, in this embodiment, the positions of the fresh air inlet 101 and the fresh air outlet 102 are both located at a position below the whole casing 100, and the position of the fresh air outlet 102 is lower than the position of the filter assembly 300. And the filter assembly 300 is horizontally opposite to the fan 200, and the axis of the fan 200 extends horizontally and passes through the filter assembly 300.

Further, in the present embodiment, the housing 100 is provided with a mounting opening 103, and the filter assembly 300 can be inserted into the housing 100 or pulled out of the housing 100 through the mounting opening 103. By providing the mounting port 103, the filter module 300 can be inserted and taken out, and the filter module 300 can be easily attached and detached and maintained. After the filter assembly 300 is inserted into the mounting opening 103 to the mounting position, a portion of the filter assembly 300 (the pull portion 320 of the frame 310) is exposed from the mounting opening 103 for easy grasping by a user or an installer. The whole installation opening 103 is located at a position relatively above the casing 100 and higher than the fresh air inlet 101 and the fresh air outlet 102, and the installation opening 103 is defined by the end cover 130 and the second volute casing 120.

In the embodiment of the present application, the filter assembly 300 includes a frame 310 and a filter 330 disposed in the frame 310, the frame 310 defines a window for airflow to pass through, the rotation axis of the centrifugal fan 200 passes through the window formed by the frame 310, and the filter 330 is disposed inside the frame 310 to filter the airflow passing through the window.

FIG. 4 is a schematic view of a frame 310 from a first perspective in one embodiment of the present disclosure; fig. 5 is a schematic view of the frame 310 from a second viewing angle according to an embodiment of the present disclosure. As shown in fig. 4 and 5, in the present embodiment, the frame body 310 is a rectangular frame, and the frame body 310 includes two vertical arms 311 spaced apart from each other in the horizontal direction and two horizontal arms spaced apart from each other in the vertical direction, and the two vertical arms 311 and the two horizontal arms together form the rectangular frame body 310.

A pulling portion 320 is disposed outside one of the trailing arms 311, so that a user or an installer can grasp the filter assembly 300 conveniently to assemble and disassemble the filter assembly 300.

In the embodiment of the present application, the filter member 330 has a windward side and a leeward side, and in the case where the fresh air device 010 is normally assembled, the windward side is inclined downward and the leeward side is inclined upward, as shown in fig. 3. The inner side of the frame 310 is convexly provided with a first limiting portion 312 and a second limiting portion 316, the first limiting portion 312 abuts against the windward side of the filter member 330, the second limiting portion 316 abuts against the leeward side of the filter member 330, and the first limiting portion 312 is strip-shaped and extends along the circumferential direction of the frame 310 on the inner side of the frame 310.

In the fresh air device 010 provided by the embodiment of the present application, the airflow enters from the fresh air inlet 101, then flows upward, flows laterally to the fan 200, and is sent out from the fresh air outlet 102 along the radial direction of the fan 200 (as shown by the straight arrow in fig. 3). The filter 330 is disposed at the upstream of the fan 200 in an inclined posture, so that the windward side faces the incoming wind direction better, which is beneficial to improving the filtering effect. For the obliquely arranged filter 330. The frame 310 is provided with a first strip-shaped stopper 312, and the first stopper 312 extends along the circumferential direction of the frame 310 on the inner side of the frame 310 and abuts against the windward side of the filter 330. Because the windward side inclines downwards, under the condition that the fresh air function is not used, the filtering piece 330 tends to collapse towards the windward side under the action of gravity, and the strip-shaped first limiting part 312 has a relatively large supporting surface, so that the edge part of the filtering piece 330 can be better supported, and the filtering piece 330 is not easy to collapse or slide down from the frame body 310. It can be seen that the filter 330 in the fresh air device 010 provided in the embodiment of the present application has better stability.

Further, the first stopper 312 is disposed inside the trailing arm 311. In the present embodiment, since the filtering member 330 is inclined to the vertical direction (the included angle is selected to be 10 ° to 30 °), there is a main tendency of bending in the longitudinal direction, and the first limiting portion 312 is disposed inside the longitudinal arm 311, that is, the first limiting portion 312 has a longitudinal extension, and the filtering member 330 is supported by the first limiting portion 312 in such a structure, so that the filtering member 330 is not easily bent in the longitudinal direction.

In this embodiment, at least two segments of the first limiting portions 312 are disposed in the frame 310, and the at least two segments of the first limiting portions 312 are spaced apart from each other along the circumferential direction of the frame 310 inside the frame 310, so as to more uniformly support the filter 330. Specifically, in the present embodiment, two spaced first limiting portions 312 are respectively disposed on the two trailing arms 311. The first limiting parts 312 are not arranged on the two cross arms, because if the first limiting parts 312 are excessively arranged on the two cross arms, the windward side of the filtering piece 330 can be excessively shielded, and the utilization rate is reduced; moreover, the cross arm is provided with the strip-shaped first limiting portion 312, which has a relatively poor effect in resisting the bending of the filter 330 compared with the case that the longitudinal arm 311 is provided with the first limiting portion 312.

In the embodiment, the second position-limiting portion 316 is a position-limiting protrusion, and has a smaller size than the first position-limiting portion 312, and specifically, the size of the second position-limiting portion in the circumferential direction of the frame 310 is smaller than that of the first position-limiting portion 312, so as to increase the utilization rate of the filter 330 as much as possible, and facilitate the installation and fixation of the filter 330. In the embodiment of the present application, since the second limiting member 316 has a smaller size than the first limiting member 312, the filter member 330 is inserted from the side where the second limiting member 316 is located when being inserted into the frame body 310. In this embodiment, the plurality of second limiting portions 316 are arranged at intervals along the circumferential direction of the frame body 310 at the inner side of the frame body 310, the second limiting portions 316 are limiting convex blocks, and the projections of the second limiting portions 316 and the first limiting portions 312 on the windward side of the filter 330 are not overlapped. In this embodiment, the second position-limiting portion 316 and the first position-limiting portion 312 are staggered, so that different positions on two surfaces of the filtering member 330 can be supported, and the stability of the filtering member 330 is improved. Specifically, the second stopper portions 316 are provided inside the two lateral arms and inside the two trailing arms 311, respectively. Since the filter 330 has a certain thickness, the first position-limiting portion 312 and the second position-limiting portion 316 are spaced apart from each other in the direction in which the airflow passes through the frame 310 (i.e., in the axial direction of the fan 200). It should be understood that in alternative embodiments, the second position-limiting portion 316 may also be configured as a bar, and the number of the first position-limiting portion 312 and the second position-limiting portion 316 may be increased or decreased as needed.

In this embodiment, a third limiting portion 317 is further protruded from the inner side of the frame 310, and the third limiting portion 317 is disposed at a connecting corner between the lateral arm and the longitudinal arm 311 so as to abut against a corner of the windward side of the filter member 330. In this embodiment, the support at the corner can further increase the stability of the filter 330. Further, in the present embodiment, two third limiting portions 317 are provided, and the two third limiting portions 317 are provided at both ends of the lower cross arm 314. The two third limiting portions 317 are connected to the first limiting portion 312.

In this embodiment, the Filter 330 is a HEPA (High efficiency particulate air Filter), the Filter 330 has a certain thickness, and the side surface of the Filter 330 is connected to the windward side and the leeward side in the thickness direction of the Filter 330. The two arms in this embodiment are an upper arm 313 and a lower arm 314, respectively, the upper arm 313 is positioned higher than the lower arm 314, and the side surface of the filter 330 abuts against the inner side of the lower arm 314. The lower cross arm 314 is provided with a notch 315 opened from the windward side to the leeward side of the frame body 310, and a part of the side surface of the filter 330 is exposed by the notch 315. It should be understood that the windward side of the frame 310 is the side facing the direction of the incoming wind, and the leeward side is the opposite side, and in fig. 3, 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 the strip-shaped first limiting portion 312 abuts against the windward side to block a part of the windward side, the utilization rate of the filter 330 is affected to a certain extent, and in this embodiment, the notch 315 is additionally provided on the lower cross arm 314, so that a part of the side surface of the lower side of the filter 330 is exposed. The part of the side surface exposed by the notch 315 is connected with the windward side, and the exposed part of the side surface can be used for air inlet, so that the effective filtering area of the filtering element 330 is expanded, and the utilization rate of the filtering element 330 is improved to a certain extent. As can be seen from fig. 4, the lower cross arm 314 is provided with a notch 315 at a position having a smaller width than other positions where the notch 315 is not provided. It should be noted that to ensure the filtering effect, the notch 315 must not be too deep, so as to avoid a gap between the lower crosspiece 314 and the filtering element 330, which would cause part of the air flow not to pass through the filtering element 330 directly downstream of the filtering assembly 300.

In the present embodiment, one of the housing 100 and the frame body 310 is provided with the guide groove 318, and the other is provided with the guide portion 121, and the guide portion 121 is slidably fitted to the guide groove 318. By providing the guide groove 318 and the guide part 121, the filter assembly 300 can be smoothly inserted from the mounting opening 103 to the mounting position when mounted. Specifically, guide grooves 318 are provided on the outer sides of the upper arm 313 and the lower arm 314 of the housing 310, respectively, and the housing 100 is provided with guide portions 121 corresponding to the two guide grooves 318, respectively.

After the filter assembly 300 is inserted into the assembled position, the filter assembly 300 needs to be stabilized to achieve the desired filtering effect, and thus a snap 319 and a snap groove are provided to stabilize the filter assembly 300 in the assembled position. Fig. 6 is an enlarged view of a portion VI in fig. 3. As shown in fig. 6, optionally, one of the housing 100 and the frame 310 is provided with a snap 319, and the other is provided with a slot (not shown), and when the filter assembly 300 is inserted from the mounting opening 103 to the assembling position, the snap 319 is engaged with the slot. In the present embodiment, two snap rings 319 are respectively disposed on the upper cross arm 313 and the lower cross arm 314, specifically, on the guide groove 318 (side wall or groove bottom); correspondingly, two clamping grooves are arranged on the inner side of the shell 100, and the clamping grooves are specifically arranged on the guide portion 121. Of course, in alternative embodiments, the positions of the latch 319 and the slot may be reversed. In this embodiment, the elastic fastener 319 can be partially embedded into the slot under the action of elastic force, and the elastic fastener 319 can also be deformed to separate from the slot when the frame 310 is pulled by external force. The guide part 121 and the guide groove 318 are used for guiding in a sliding fit manner, so that the elastic buckle 319 can be smoothly clamped into the clamping groove, and the two groups of structures are compact in arrangement and do not occupy redundant space.

In addition, an air conditioner (not shown in the drawings) is further provided in the embodiment of the present application, and includes an air conditioner main body and the fresh air device 010 introduced in the above embodiment of the present application. The air conditioner main body is at least used for realizing the basic temperature adjusting function of the air conditioner, and the fresh air device 010 is used for leading outdoor air to the indoor space so as to keep the indoor air fresh. The air conditioner may be a wall-mounted air conditioner.

To sum up, in the filter assembly 300 of the fresh air device 010 provided in the embodiment of the present application, the frame 310 is provided with the first strip-shaped limiting portion 312 for the filter member 330 disposed in an inclined manner, and the first limiting portion 312 extends along the circumferential direction of the frame 310 on the inner side of the frame 310 and is used for abutting against the windward side of the filter member 330. Because the windward side is inclined downward, the filter 330 tends to collapse toward the windward side under the action of gravity without using a fresh air function, and the strip-shaped first limiting portion 312 has a relatively large supporting surface, so that the edge of the filter 330 can be better supported, and the filter 330 is not easy to collapse or slide down from the frame 310. Therefore, the filter 330 in the fresh air device 010 provided by the embodiment of the present application has better stability. The air conditioner that this application embodiment provided includes foretell new trend device 010, consequently also has corresponding beneficial effect.

While the present application is disclosed above, the present application is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present disclosure, and it is intended that the scope of the present disclosure be defined by the appended claims.

Claims

1. A fresh air device is characterized in that the fresh air device (010) comprises a shell (100), a fan (200) and a filtering component (300), an air duct is formed in the shell (100), a fresh air inlet (101) and a fresh air outlet (102) which are communicated with the air duct are formed in the surface of the shell (100), the fan (200) and the filtering component (300) are arranged in the air duct, the filtering component (300) is positioned between the fan (200) and the fresh air inlet (101), the filtering component (300) comprises a frame body (310) and a filtering piece (330), the frame body (310) is enclosed into a window through which air flows, and the filtering piece (330) is arranged on the inner side of the frame body (310) to filter the air flow which passes through the window; it has windward side and leeward side to filter piece (330), windward side slope down, leeward side slope up, the protruding spacing portion of first (312) and the spacing portion of second (316) that is equipped with of framework (310) inboard, first spacing portion (312) butt filter piece (330) windward side, the spacing portion of second (316) butt filter piece (330) leeward side, first spacing portion (312) are the strip and are in the inboard edge of framework (310) the circumference of framework (310) extends.

2. The fresh air device according to claim 1, wherein at least two segments of the first limiting portions (312) are disposed in the frame body (310), and the at least two segments of the first limiting portions (312) are arranged at intervals along the circumferential direction of the frame body (310) inside the frame body (310).

3. The fresh air device as claimed in claim 2, wherein the filter member (330) is rectangular, the frame body (310) comprises two longitudinal arms (311) spaced apart from each other in the horizontal direction and two transverse arms spaced apart from each other in the vertical direction, the two longitudinal arms (311) and the two transverse arms together form the rectangular frame body (310), and the first limiting portion (312) is disposed inside the longitudinal arms (311).

4. The fresh air device as claimed in claim 3, wherein a third limiting portion (317) is further protruded from the inside of the frame (310), and the third limiting portion (317) is disposed at a corner where the cross arm and the longitudinal arm (311) are connected to abut against a corner of the windward side of the filter member (330).

5. The fresh air device according to claim 3, wherein the two cross arms are an upper cross arm (313) and a lower cross arm (314), the upper cross arm (313) is located higher than the lower cross arm (314), a side surface of the filter member (330) abuts against an inner side of the lower cross arm (314), the side surface of the filter member (330) connects the windward side and the leeward side in a thickness direction of the filter member (330), the lower cross arm (314) is provided with a notch (315) that opens from the windward side to the leeward side of the frame body (310), and a part of the side surface of the filter member (330) is exposed by the notch (315).

6. The fresh air device as claimed in any one of claims 1 to 5, wherein a plurality of the second limiting portions (316) are arranged at intervals along the circumferential direction of the frame body (310) at the inner side of the frame body (310), the second limiting portions are limiting convex blocks, and the projections of the second limiting portions and the first limiting portions on the windward side of the filter element do not overlap.

7. The fresh air device as claimed in any of claims 1 to 5, wherein a mounting opening (103) is further provided on the housing (100), and the filter assembly (300) can be inserted into the housing (100) or extracted from the housing (100) through the mounting opening (103).

8. The fresh air device as claimed in claim 7, wherein one of the housing (100) and the frame (310) is provided with a guide groove (318), and the other is provided with a guide part (121), and the guide part (121) is slidably fitted with the guide groove (318).

9. The fresh air device as claimed in claim 8, wherein one of the guide groove (318) and the guide part (121) is provided with a snap (319), and the other is provided with a snap groove, and when the filter assembly (300) is inserted from the mounting opening (103) to the assembling position, the snap (319) is snap-fitted with the snap groove.

10. The fresh air device according to any one of claims 1 to 5 wherein the fresh air inlet (101) is located lower than the filter assembly (300).

11. The fresh air device as claimed in any of claims 1 to 5, wherein the fan (200) is a centrifugal fan (200), and wherein the axis of rotation of the centrifugal fan (200) passes through a window formed in the frame (310).

12. The fresh air device as claimed in any of claims 1 to 5, wherein the filter element (330) is a HEPA filter screen.

13. An air conditioner characterized in that it comprises a fresh air device (010) as claimed in any one of claims 1 to 12.