Fresh air module and duct type air conditioner

Abstract

The invention provides a fresh air module and a duct type air conditioner. The fresh air module comprises a shell which is provided with a first access hole; the access cover plate is detachably arranged at the first access hole in a covering manner; a mounting opening is formed in one axial end of the volute, and the mounting opening faces the first access hole; the flow guide ring is arranged at the mounting opening in a sleeving manner, and an air inlet communicated with the mounting opening is formed in a surrounding manner; the flow guide ring is detachably connected with the volute and can enter and exit from the shell through the first access hole; the filter screen assembly comprises a fixing frame and a filter screen installed on the fixing frame, and the fixing frame is fixed to the flow guide ring. Therefore, the shell of the fresh air module only needs to be provided with one access hole, the maintenance of the wind wheel and the motor and the replacement of the filter screen can be realized, and the maintenance problem of the fresh air module caused by the limitation of a suspended ceiling structure is solved.

Description

Technical Field

[0001] The present application relates to but is not limited to the field of air conditioning technology, and specifically refers to a fresh air module and an air duct unit. Background Art

[0002] For the sake of aesthetics, the decoration style of ducted air conditioners on the market currently does not have a separate inspection port on the ceiling. Instead, the inspection port is designed to be the same size as the return air port of the unit, that is, the inspection port and the return air port are designed as one, that is, the return air port is lengthened. The return air grille is installed in the return air port, so only the return air grille can be seen from the appearance. However, this leads to the location and width of the inspection port being limited. Some units now have newly added fresh air modules. Due to the large size of the fresh air module, the disassembly and maintenance of internal parts has become a problem. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a fresh air module and a duct machine, which can solve the problem of disassembly and maintenance of the fresh air module.

[0004] To this end, an embodiment of the present application provides a fresh air module, comprising: an outer shell, the outer shell being provided with a first inspection port; an inspection cover, which is detachably covered on the first inspection port; a volute, an axial end of the volute being provided with an installation opening, the installation opening facing the first inspection port; a guide ring, which is sleeved on the installation opening and surrounds an air inlet connected to the installation opening; and the guide ring is detachably connected to the volute and can enter and exit the outer shell through the first inspection port; and a filter assembly, comprising a fixing frame and a filter mounted on the fixing frame, and the fixing frame is fixed to the guide ring.

[0005] In the embodiment of the present application, the guide ring and the volute are designed as a split structure, so that the guide ring can be removed from the volute. In this way, when the wind wheel or the motor needs to be repaired, the guide ring can be separated from the volute, and then the guide ring can be removed and taken out from the first inspection port, so that the wind wheel is not blocked by the guide ring and can be fully exposed, and the wind wheel can be taken out of the volute for inspection without taking out the entire volute. The size of the motor is relatively small, and it can also be easily taken out through the first inspection port for maintenance.

[0006] In addition, the fixing frame of the filter assembly is fixed on the guide ring. Therefore, when the filter needs to be replaced, the inspection cover can be removed, and then the filter can be replaced through the first inspection port to meet the regular replacement needs of the filter. When the wind wheel or motor needs to be repaired, the filter assembly can be removed together with the guide ring, which will not affect the repair of the wind wheel and the motor.

[0007] In this way, the shell of the fresh air module only needs to be provided with one inspection port (i.e., the first inspection port) to realize the inspection of the wind wheel and the motor and the replacement of the filter, thus solving the maintenance problem of the fresh air module caused by the limitation of the ceiling structure.

[0008] Based on the above technical solution, the present application can also be improved as follows.

[0009] In an exemplary embodiment, the inspection cover covers a portion of the installation opening, and the outer shell comprises: a shell body, the shell body is provided with the first inspection port and an avoidance gap, the avoidance gap is adjacent to the first inspection port and is connected as a whole; and an end plate, which covers the avoidance gap and covers another portion of the installation opening and is configured to press the filter assembly.

[0010] In an exemplary embodiment, the volute is also provided with an air inlet passage, which is located radially outside the installation opening and is connected to the air inlet; the filter is located radially outside the air inlet and between the air inlet passage and the air inlet; the guide ring is rotatably mounted on the installation opening, and the guide ring is configured to be able to rotate between a first position and a second position; based on the guide ring rotating to the first position, the filter assembly is at least partially blocked by the end plate and pressed by the end plate; based on the guide ring rotating to the second position, the filter assembly is detached from the end plate and faces the first inspection port.

[0011] In an exemplary embodiment, the end plate is movably connected to the housing so that the end plate can press the filter assembly or detach from the filter assembly.

[0012] In an exemplary embodiment, the shell is provided with a limiting hole, and an insert tongue is provided at one end of the end plate away from the inspection cover; the insert tongue is inserted into and limited in the limiting hole, and can move relative to the limiting hole, so that the end plate can press the filter assembly or detach from the filter assembly.

[0013] In an exemplary embodiment, the guide ring includes: a guide plate, which is sleeved in the mounting opening and surrounds the air inlet; and a mounting plate, which is connected to the radial outer end of the guide plate and is detachably connected to the volute, and the fixing frame is fixed to the mounting plate.

[0014] In an exemplary embodiment, the mounting plate includes: a connecting cover plate, connected to the radial outer end of the guide plate and covering a portion of the mounting opening; and a side panel, connected to the radial outer end of the connecting cover plate and sleeved on the radial outer side of the mounting opening, and the side panel is detachably connected to the volute, and the fixing frame is fixed to the connecting cover plate and / or the side panel.

[0015] In an exemplary embodiment, the volute is provided with a first flange, which is arranged along the circumference of the installation opening; the plate surface of the connecting cover plate facing the installation opening is provided with a second flange, and the second flange abuts against the first flange.

[0016] In an exemplary embodiment, the volute is provided with an end cover, the end cover is provided with the mounting opening; the end cover is provided with a first connecting portion, the guide ring is provided with a second connecting portion, and the guide ring and the end cover are connected via the first connecting portion and the second connecting portion.

[0017] In an exemplary embodiment, the first connecting portion includes a plurality of first clips arranged at intervals, and the first clips and the end cover enclose a slot, and the second connecting portion includes a plurality of second clips, and the second clips are arranged to rotate in and out of the slot along the circumference of the guide ring.

[0018] In an exemplary embodiment, at least one of the first buckles is fixedly connected to the corresponding second buckle by a fastener; and / or the slot is closed along one end of the circumference of the guide ring to limit the rotation range of the guide ring relative to the volute.

[0019] In an exemplary embodiment, the fixing frame extends along the circumference of the guide ring, and baffles are provided at both ends of the fixing frame in the circumferential direction; the volute is provided with a sealing protrusion, and the baffle, the sealing protrusion, the outer shell and the inspection cover together enclose an air passage connected to the fresh air inlet, the air passage is connected to the air inlet, and the filter is arranged at one end of the air passage close to the air inlet.

[0020] In an exemplary embodiment, the fixing frame and the guide ring are an integrated structure; or, the fixing frame and the guide ring are a split assembly structure.

[0021] In an exemplary embodiment, the guide ring is provided with a limiting protrusion and a socket; the fixing frame is provided with a third buckle, and the third buckle is configured to pass through the socket and hook the end face of the limiting protrusion to limit the fixing frame from detaching from the guide ring.

[0022] An embodiment of the present application also provides a duct air conditioner, which is configured to be concealed in a suspended ceiling, and the duct air conditioner comprises: a duct air conditioner main body, which is provided with a return air outlet; and a fresh air module as described in any one of the above embodiments, which is arranged on one side of the length direction of the duct air conditioner main body and is connected to the duct air conditioner main body; the suspended ceiling is provided with a second inspection port, which is arranged corresponding to the return air outlet and the inspection cover, and the area of ​​the second inspection port is larger than the total area of ​​the return air outlet and the inspection cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of the assembled duct machine provided in some embodiments of the present application from a bottom view;

[0024] Figure 2 A bottom-up structural schematic diagram of a duct machine provided in some embodiments of the present application;

[0025] Figure 3 This is a partial three-dimensional structural diagram of a fresh air module provided in some embodiments of the present application. Figure 3 The arrows in the figure indicate the direction of airflow;

[0026] Figure 4 for Figure 3 The structure shown is a schematic diagram of the structure after removing the filter, wind wheel and motor;

[0027] Figure 5 for Figure 4 Schematic diagram of the structure of the middle volute;

[0028] Figure 6 for Figure 3 Schematic diagram of the structure of the middle guide ring and filter screen;

[0029] Figure 7 A bottom-up structural schematic diagram of a fresh air module in a first state after removing the inspection cover provided in some embodiments of the present application;

[0030] Figure 8 for Figure 7 A schematic diagram of the structure of the fresh air module in the second state when viewed from above is shown;

[0031] Fig. 9 for Figure 7 A schematic diagram of the three-dimensional structure of the fresh air module in the third state is shown;

[0032] Fig.10 for Fig. 9 The schematic diagram of the structure of the fresh air module as seen from above is shown;

[0033] Fig.11 for Fig.10 Schematic diagram of the cross-sectional structure along the AA direction;

[0034] Fig.12 A schematic diagram of a three-dimensional structure of an end plate provided in some embodiments of the present application;

[0035] Fig.13 for Fig.12 A bottom view of the structure of the end plate shown;

[0036] Fig.14 A schematic diagram of the three-dimensional structure of the front side plate provided in some embodiments of the present application;

[0037] Fig.15 for Fig.14 A schematic diagram of the enlarged structure of the middle B part;

[0038] Fig.16 A schematic diagram of assembling the end plate and the front side plate provided in some embodiments of the present application;

[0039] Fig.17 for Fig.16 The enlarged structural diagram of the middle C part;

[0040] Fig.18 for Fig.17 a bottom view schematic diagram of the structure shown;

[0041] Fig.19 A schematic diagram of the three-dimensional structure of a guide ring provided in some embodiments of the present application;

[0042] Fig. 20 A schematic diagram of a three-dimensional structure of a fixing frame provided in some embodiments of the present application;

[0043] Fig.21 for Fig.19 The guide ring shown is Fig. 20 Schematic diagram of the assembly of the fixing bracket shown.

[0044] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0045] 100 fresh air modules;

[0046] 1 housing, 11 shell, 111 first inspection port, 112 avoidance notch, 113 limiting hole, 1131 insertion hole, 1132 anti-drop hole, 114 front side plate, 1141 folding edge, 1142 exhaust port, 12 end plate, 121 plug tongue, 1211 connecting portion, 1212 anti-drop portion, 122 third connecting hole, 123 third flange, 124 fourth flange, 13 fresh air inlet;

[0047] 2 Inspection cover;

[0048] 3 volute, 31 end cover, 311 installation opening, 312 first flange, 313 first buckle, 3131 first connection hole, 314 slot, 315 sealing protrusion, 32 air inlet channel, 321 first air outlet, 322 second air outlet, 33 air outlet, 34 air outlet;

[0049] 4 guide ring, 41 guide plate, 411 air inlet, 42 mounting plate, 421 connecting cover plate, 4211 second flange, 422 side panel, 423 second buckle, 4231 second connecting hole, 424 limiting protrusion, 425 plug hole;

[0050] 5 filter assembly, 51 fixing frame, 511 baffle, 512 third buckle, 52 filter;

[0051] 6 wind wheels;

[0052] 7 motors;

[0053] 200 duct machine body;

[0054] 300 suspended ceiling, 302 second inspection port. DETAILED DESCRIPTION

[0055] The principles and features of the present application are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0056] The embodiment of the present application provides a fresh air module 100 and a duct air conditioner, wherein the fresh air module 100 can be used in a duct air conditioner or in other types of air treatment equipment.

[0057] like Figure 1 and Figure 2 As shown, the duct machine provided in the embodiment of the present application includes a duct machine body 200 and a fresh air module 100. The duct machine body 200 can be an indoor unit of the duct. The indoor unit of the duct can be connected to an outdoor unit of the duct. The indoor unit of the duct is concealed in the ceiling, and the outdoor unit of the duct is installed outdoors. The duct machine body 200 can also be an integrated machine.

[0058] The duct machine body 200 is provided with a return air port, and the return air port of the duct machine body 200 is used to allow indoor air to enter the duct machine body 200. The duct machine body 200 is also provided with an air outlet, and the air outlet of the duct machine body 200 is used to discharge the air after heat exchange in the duct machine body 200 into the room. The duct machine body 200 is usually in a rectangular shape, and the air outlet of the duct machine body 200 can be set on the front side wall of the duct machine, and the return air port of the duct machine body 200 can be set on the bottom wall of the duct machine.

[0059] like Figure 1 As shown, the duct air conditioner is concealed in the ceiling 300. The side panels of the ceiling 300 are provided with air supply ports corresponding to the air outlets of the duct air conditioner body 200, and air supply grilles can be provided at the air supply ports. The bottom plate of the ceiling 300 is provided with return air ports corresponding to the return air ports of the duct air conditioner body 200, and return air grilles can be provided at the return air ports of the ceiling 300. In addition, the return air port of the ceiling 300 is also the inspection port of the duct air conditioner (referred to as the second inspection port 302, as shown in FIG. 1 ). Figure 1 302 ), which is used for the maintenance of the duct machine during use. During maintenance, the return air grille can be disassembled to expose the second maintenance port 302, and the duct machine can be repaired.

[0060] Among them, Figure 1 and Figure 2 As shown, the fresh air module 100 is arranged in the length direction of the air duct machine body 200 (i.e. Figures 1 to 6One side of the duct machine body 200 is connected to the duct machine body 200.

[0061] In this way, the depth of the air duct unit (ie, the depth of the air duct unit horizontally extending into the side wall of the ceiling 300) will not be increased, and the second inspection opening 302 can be formed into a narrow and long structure, which is more in line with the current mainstream decoration style.

[0062] In some exemplary embodiments, please refer to Figure 1 and Figure 2 As shown, the second inspection port 302 is arranged corresponding to the return air port of the duct machine body 200 and the inspection cover 2 of the fresh air module 100, and the area of ​​the second inspection port 302 is larger than the total area of ​​the return air port of the duct machine body 200 and the inspection cover 2 of the fresh air module 100.

[0063] In this way, when the return air grille is removed, the air inlet of the duct machine body 200 and the inspection cover 2 can be exposed. The duct machine body 200 can be inspected by opening the bottom wall (or inspection panel) where the air inlet of the duct machine body 200 is located. The fresh air module 100 can be inspected by opening the inspection cover 2. Therefore, only one inspection port (i.e., the second inspection port 302) needs to be provided on the ceiling 300 to realize the inspection of the duct machine body 200 and the fresh air module 100. In addition, the second inspection port 302 can maintain a long and narrow shape, which conforms to the current mainstream decoration style and is conducive to the market promotion of the product.

[0064] In the related art, the guide ring and the volute are both integrated structures. Since the diameter of the wind wheel is larger than the diameter of the air inlet of the guide ring, when the wind wheel needs to be disassembled, the volute usually needs to be disassembled completely. However, due to the size limitation of the second inspection port, the volute cannot be completely disassembled, making the inspection of the wind wheel more difficult.

[0065] Please refer to Figures 2 to 9 As shown, the fresh air module 100 provided in the embodiment of the present application includes: a housing 1, an inspection cover 2, a volute 3, a guide ring 4 and a filter assembly 5. The fresh air module 100 also includes a wind wheel 6 arranged in the volute 3 and a motor 7 connected to the wind wheel 6. The wind wheel 6 can be, but is not limited to, a centrifugal wind wheel.

[0066] The housing 1 is provided with a first inspection port 111. Fig. 9 shown.

[0067] Inspection cover 2 (such as Figure 2 As shown) is detachably covered at the first inspection opening 111.

[0068] like Figure 5 As shown, an installation opening 311 is provided at one axial end of the volute 3. The installation opening 311 faces the first inspection opening 111. Please refer to Figures 7 to 9The volute 3 is also provided with an air inlet passage 32, as shown in FIG. Figure 5 As shown, the air inlet passage 32 is located radially outside the mounting opening 311 .

[0069] like Figure 4 As shown, the guide ring 4 is sleeved on the installation opening 311 and surrounds an air inlet 411 communicating with the installation opening 311 and the air inlet channel 32. The guide ring 4 is detachably connected to the volute 3 and can enter and exit the housing 1 through the first inspection port 111.

[0070] like Figure 3 and Figure 4 As shown, the filter assembly 5 includes a fixing frame 51 and a filter 52 mounted on the fixing frame 51. The fixing frame 51 is fixed to the guide ring 4. Please refer to Figure 3 and Fig. 9 As shown, the filter 52 is located radially outside the air inlet 411, between the air inlet channel 32 and the air inlet 411, and is arranged along the circumference of the guide ring 4. The filter 52 can be, but is not limited to, a HEPA filter. The height of the filter 52 can be greater than the height of the fixing frame 51, such as Figure 3 As shown, the filter screen 52 can be tightly pressed against the housing 1 to achieve sealing, thereby preventing air leakage between the filter screen 52 and the housing 1 and affecting the filtering and purification effect of the fresh air.

[0071] The housing 1 is also provided with a fresh air inlet 13. Fig. 9 The air inlet 32 ​​is connected to the fresh air inlet 13. The volute 3 is also provided with an air outlet 33, as shown in FIG. Figure 5 As shown. The air outlet 33 of the volute 3 is connected to the air inlet 411 of the guide ring 4. The motor 7 drives the wind wheel 6 to rotate, so that outdoor fresh air can enter the air inlet channel 32 through the fresh air inlet 13, enter the air inlet 411 of the guide ring 4 after being filtered by the filter 52, and then be discharged through the air outlet 33 of the volute 3, and sent into the indoor environment through the air supply port of the ceiling 300, so as to realize the fresh air function.

[0072] Since the air inlet passage 32 is located radially outside the mounting opening 311, Figure 3 As shown, the fresh air needs to flow to the axial outer side of the installation opening 311 after passing through the air inlet channel 32, and then flow to the wind wheel 6 through the air inlet 411 of the guide ring 4. Figure 5 As shown, the air inlet channel 32 may include a first air outlet 321 and a second air outlet 322. The first air outlet 321 is connected to the fresh air inlet 13, and the second air outlet 322 is connected to the air inlet 411 of the guide ring 4. The central axis of the first air outlet 321 may be in a horizontal direction to facilitate docking with the fresh air duct. The second air outlet 322 may be arranged obliquely relative to the first air outlet 321, such as Figure 5As shown, the fresh air is directed to one axial side of the volute 3, so that the fresh air can be filtered by the filter screen 52 and then enter the volute 3 through the guide ring 4. In order to shorten the length of the air inlet channel 32 to reduce wind loss, the first air outlet 321 can be arranged on the side wall of the volute 3, and the side wall can be arranged adjacent to the side wall of the volute 3 with the air outlet 33, as shown in FIG. Figure 5 The second air outlet 322 may be disposed on the end wall of the volute 3 having the mounting opening 311, and the location of the second air outlet 322 may protrude outward relative to the mounting opening 311, as shown. Figure 5 Considering the cost, the filter assembly 5 does not need to be set in a cylindrical shape, but only needs to be set in a part of a cylindrical shape (such as a semi-cylindrical shape), such as Figure 3 As shown, it is sufficient to ensure that the airflow entering the guide ring 4 is filtered and purified.

[0073] In the embodiment of the present application, the guide ring 4 and the volute 3 are designed as a separate structure, so that the guide ring 4 can be removed from the volute 3 (please refer to Figure 3 and Figure 4 As shown). In this way, when the wind wheel 6 or the motor 7 needs to be repaired, the guide ring 4 can be separated from the volute 3, and then the guide ring 4 can be removed and taken out from the first inspection port 111, so that the wind wheel 6 is not blocked by the guide ring 4 and can be fully exposed, and the wind wheel 6 can be taken out from the volute 3 for inspection without taking out the entire volute 3. The size of the motor 7 is relatively small, and it can also be easily taken out through the first inspection port 111 for maintenance.

[0074] Furthermore, the fixing frame 51 of the filter assembly 5 is fixed on the guide ring 4, as shown in FIG. Figure 6 Therefore, when the filter 52 needs to be replaced, the inspection cover 2 can be removed, and then the filter 52 can be replaced through the first inspection port 111 to meet the regular replacement requirements of the filter 52. When the wind wheel 6 or the motor 7 needs to be repaired, the filter assembly 5 can be removed together with the guide ring 4, which will not affect the repair of the wind wheel 6 and the motor 7.

[0075] In this way, the shell 1 of the fresh air module 100 only needs to be provided with one inspection port (i.e., the first inspection port 111) to realize the inspection of the wind wheel 6 and the motor 7 and the replacement of the filter 52, thereby solving the maintenance problem of the fresh air module 100 caused by the structural limitation of the ceiling 300.

[0076] In addition, the filter 52 is used to filter the inhaled fresh air, and the filtered fresh air then enters the wind wheel 6, that is, the filter 52 is arranged upstream of the wind wheel 6, rather than downstream of the wind wheel 6, which can reduce wind resistance and increase exhaust volume.

[0077] In some exemplary embodiments, Figure 8As shown, the radius R of the inner wall of the filter screen 52 is in the range of 90 mm to 180 mm, such as 90 mm, 100 mm, 120 mm, 150 mm, 180 mm, etc. The curvature α of the filter screen 52 is in the range of 60° to 270°, such as 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, etc. The thickness T (radial thickness) of the filter screen 52 is in the range of 10 mm to 60 mm, such as 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, etc.

[0078] In this way, the size of the filter 52 is appropriate, which can ensure that it has a relatively large size to achieve a better filtering effect, while avoiding the inconvenience of removal and replacement due to excessive size, thereby ensuring that the filter 52 can be removed through the first inspection port 111 for replacement.

[0079] Of course, the radius of the inner wall of the filter 52, the curvature of the filter 52, and the thickness of the filter 52 are not limited to the above ranges and can be adjusted as needed.

[0080] In some exemplary embodiments, Figure 7 , Figure 8 and Fig. 9 As shown, the inspection cover 2 covers a portion of the installation opening 311 . The housing 1 comprises: a shell 11 and an end plate 12 .

[0081] The shell 11 is provided with a first inspection opening 111 and an avoidance gap 112 , and the avoidance gap 112 is adjacent to and integrally connected with the first inspection opening 111 .

[0082] Please combine Fig. 9 , Fig.10 and Fig.11 As shown, the end plate 12 is covered at the avoidance gap 112 and blocks another part of the installation opening 311. The end plate 12 is configured to press the filter assembly 5. During normal operation of the duct unit, the end plate 12 can press the filter assembly 5 to achieve sealing, preventing part of the air flow from flowing through the space between the filter assembly 5 and the housing 1 without being filtered by the filter 52, thereby affecting the filtering and purification effect of the fresh air.

[0083] In other words, the installation opening 311 of the volute 3 is not completely opposite to the first inspection opening 111, but a part of it is opposite to the first inspection opening 111, and the other part is opposite to the avoidance gap 112. When the inspection cover 2 is removed, the installation opening 311 of the volute 3 is not completely exposed, and a part of it is located in the ceiling 300, and the part located in the ceiling 300 is blocked by the end plate 12 at the avoidance gap 112. Since the first inspection opening 111 is not completely in contact with the ceiling 300 and there is still a part of space, although the guide ring 4 and the wind wheel 6 are partially hidden in the ceiling 300, the guide ring 4 and the wind wheel 6 can be taken out from the first inspection opening 111 by tilting and moving the guide ring 4 and the wind wheel 6.

[0084] Moreover, with such an arrangement, the width of the first inspection opening 111 can be relatively small, so that the size of the second inspection opening 302 in the width direction can be relatively small, so as to avoid the width of the second inspection opening 302 being too large and affecting the aesthetics after decoration, thereby taking into account both the aesthetics of the ceiling 300 and the maintenance problems of the fresh air module 100 caused by the structural limitations of the ceiling 300.

[0085] On the other hand, the filter assembly 5 can also be set to be relatively large, which is conducive to improving the filtering and purification effect of the filter 52 on the fresh air and ensuring the filtering and purification requirements of large air volumes of fresh air.

[0086] The first inspection opening 111 and the avoidance gap 112 are arranged along the width direction of the second inspection opening 302 (i.e. Figures 1 to 11 The area of ​​the first inspection opening 111 may be larger than the area of ​​the avoidance gap 112. The central axis of the installation opening 311 may be directly opposite to the first inspection opening 111. Figure 7 and Figure 8 In this way, most of the guide ring 4 and the wind wheel 6 can face the first inspection opening 111, and only a small part faces the avoidance gap 112 and is hidden in the ceiling 300, which is conducive to reducing the difficulty of taking out the guide ring 4 and the wind wheel 6 from the first inspection opening 111, thereby reducing the difficulty of maintenance and replacement.

[0087] In some exemplary embodiments, the guide ring 4 is rotatably mounted on the mounting opening 311, and the guide ring 4 is configured to be rotatable between a first position and a second position. Figure 7 and Figure 8 shown.

[0088] like Figure 7 As shown, based on the guide ring 4 rotating to the first position, the filter assembly 5 is at least partially blocked and pressed by the end plate 12. When the filter assembly 5 is only partially blocked and pressed by the end plate 12, the other part of the filter assembly 5 can be blocked and pressed by the inspection cover 2.

[0089] like Figure 8 As shown, based on the guide ring 4 rotating to the second position, the filter assembly 5 is separated from the end plate 12 and faces the first inspection port 111 .

[0090] In this way, when the filter screen 52 needs to be replaced, the inspection cover plate 2 can be removed to release the fixed connection between the guide ring 4 and the volute 3, and then the guide ring 4 is rotated to rotate the filter screen assembly 5 to a position facing the first inspection port 111 (i.e., the second position, such as Figure 8 As shown in FIG. 1 ), the end plate 12 can be pressed to prevent the filter 52 from being disassembled, and the filter 52 can be fully exposed, so that the filter 52 can be easily and quickly removed for replacement. After the new filter 52 is installed on the fixing frame 51, the guide ring 4 is rotated to reset the filter assembly 5 to the first position (as shown in FIG. 1 ). Figure 7 In this way, the filter screen 52 can be disassembled and replaced more conveniently.

[0091] Of course, the filter 52 can be replaced without rotating the guide ring 4. For example, during normal operation, one end of the filter 52 is blocked by the end plate 12, and the other end is blocked by the inspection cover 2. When the filter 52 needs to be replaced, after removing the inspection cover 2, a part of the filter 52 will be exposed, and the filter 52 can be directly pulled out by pulling the exposed end of the filter 52. The new filter 52 can be inserted along the exposed end of the fixing frame 51, and then inserted into place along the fixing frame 51 to achieve the replacement of the filter 52.

[0092] In some exemplary embodiments, the end plate 12 is movably connected to the housing 11 so that the end plate 12 can press the filter assembly 5 or be separated from the filter assembly 5 .

[0093] The end plate 12 is designed as a movable structure. When replacing the filter 52, the end plate 12 only needs to be loosened (there is no need to remove the end plate 12) to release the pressure constraint of the end plate 12 on the filter assembly 5, which is conducive to the convenient removal of the filter 52. This solves the problem that the end plate 12 must press the filter 52 to seal it, and at the same time loosen the filter 52 to facilitate the removal of the filter 52.

[0094] As for the movable connection between the end plate 12 and the housing 11, there is no restriction. For example, one end of the end plate 12 away from the inspection cover 2 is rotatably connected to the housing 11 (such as rotatably connected by a rotating shaft, hinge, etc.), and the other end is detachably connected to the housing 11. In this way, the other end of the end plate 12 can be rotated downward to loosen the constraint on the filter screen 52, such as Fig. 9 and Fig.11 As shown; alternatively, the end plate 12 as a whole can move up and down relative to the housing 11 to press the filter assembly 5 or to detach from the filter assembly 5.

[0095] In some exemplary embodiments, the housing 11 is provided with a limiting hole 113, such as Fig.14 As shown. The end of the end plate 12 away from the inspection cover 2 is provided with a tongue 121, as shown Fig.12 and Fig.13 The inserting tongue 121 is inserted and limited in the limiting hole 113 and can move relative to the limiting hole 113 so that the end plate 12 can press the filter assembly 5 or be separated from the filter assembly 5 .

[0096] In this way, the end of the end plate 12 away from the inspection cover 2 can be plugged into the shell 11 and can move relative to the shell 11 without being easily separated from the shell 11, which not only meets the inspection needs, but also does not need to remove the end plate 12.

[0097] The number of the plug tongues 121 may be multiple (such as two, three, four or more), and the multiple plug tongues 121 are arranged at intervals. The number of the limiting holes 113 may be equal to the number of the plug tongues 121 and correspond one to one. In one example, Fig.12 and Fig.13 As shown, the number of the inserting tongues 121 is three, and the number of the limiting holes 113 is three.

[0098] In some exemplary embodiments, the end plate 12 is connected to the volute 3 via fasteners.

[0099] This helps to improve the stability and reliability of the end plate 12. The end plate 12 may be provided with a third connection hole 122, such as Fig.12 and Fig.13 As shown. The fastener is inserted into the third connection hole 122 and fixedly connected to the housing 11. The third connection hole 122 can be set on the side of the end plate 12 close to the inspection cover 2. In this way, after the fastener is removed, the end of the end plate 12 close to the inspection cover 2 can be rotated downward under the action of gravity (such as Fig. 9 and Fig.11 As shown), the compression constraint on the filter screen 52 is released.

[0100] A third flange 123 may be provided at one end of the end plate 12 close to the inspection cover plate 2. Fig.12 As shown, the third flange 123 can be covered by the inspection cover 2 .

[0101] In some exemplary embodiments, the inserting tongue 121 includes an inserting portion 1211 connected to the end plate 12 and an anti-dropping portion 1212 connected to the inserting portion 1211. Fig.13 and Fig.17 The limiting hole 113 includes an insertion hole 1131 and an anti-drop hole 1132 connected to the insertion hole 1131. Fig.15 and Fig.17 shown.

[0102] The insertion hole 1131 is configured to allow the anti-slip portion 1212 and the insertion portion 1211 to pass through. The anti-slip hole 1132 is configured to allow the insertion portion 1211 to pass through and to restrict the anti-slip portion 1212 from passing through, so as to restrict the insertion tongue 121 from slipping out of the limiting hole 113 .

[0103] Among them, the area of ​​the insertion hole 1131 is larger than the area of ​​the anti-dropout hole 1132. The width of the insertion part 1211 is smaller than the width of the anti-dropout part 1212. The width of the insertion part 1211 is smaller than the width of the anti-dropout hole 1132, and the width of the anti-dropout part 1212 is smaller than the width of the insertion hole 1131. Therefore, the insertion part 1211 can pass through the insertion hole 1131 and the anti-dropout hole 1132. However, the anti-dropout part 1212 can only pass through the insertion hole 1131, but not the anti-dropout hole 1132. The width of the insertion part 1211, the width of the anti-dropout part 1212, the width of the anti-dropout hole 1132, and the width of the insertion hole 1131 all refer to Figures 12 to 18 The width in the left and right directions.

[0104] In this way, when the inserting tongue 121 is assembled with the limiting hole 113, the inserting tongue 121 is first inserted into the insertion hole 1131, and then the inserting tongue 121 is moved toward the anti-dropping hole 1132 to align the end plate 12 with the housing 11. Fig.16 At this time, the anti-dropout portion 1212 is restricted by the anti-dropout hole 1132 and cannot pass through the anti-dropout hole 1132 to achieve the limiting effect.

[0105] In some embodiments, after assembly, the anti-drop hole 1132 is located below the insertion hole 1131. Fig.16 and Fig.17 It can be seen that the inserting tongue 121 can automatically fall down under the action of gravity, so that the inserting portion 1211 enters the anti-dropping hole 1132 to prevent the end plate 12 from being pulled out horizontally.

[0106] In some embodiments, the housing 11 includes a front side panel 114. Figures 14 to 16 The side wall of the front side plate 114 is provided with an exhaust port 1142 which is connected to the air outlet 33 of the volute 3. Fig.14 The bottom wall of the front side plate 114 is bent and extended at one end close to the end plate 12 to form an L-shaped folded edge 1141, and the limiting hole 113 is arranged at the corner of the folded edge 1141, as shown in FIG. Fig.14 and Fig.15 The end of the end plate 12 close to the front side plate 114 may be provided with a fourth flange 124, as shown in FIG. Fig.12 The fourth flange 124 can abut against the folded edge 1141 of the front side plate 114, so that the end plate 12 and the front side plate 114 remain flush. The inserting tongue 121 is provided at the fourth flange 124. After the inserting tongue 121 is inserted into the limiting hole 113, it will be restricted by the bottom wall of the front side plate 114 and cannot be separated from the front side plate 114 in the vertical direction.

[0107] In some embodiments, the insertion portion 1211 is connected to the anti-detachment portion 1212 to form an L-shaped structure, such as Fig.13 and Fig.17 The center line of the anti-drop hole 1132 is staggered with the center line of the insertion hole 1131 in the horizontal direction (as shown in FIG. Fig.15 As shown), after the insertion portion 1211 is inserted into the anti-drop hole 1132, the anti-drop portion 1212 and the insertion hole 1131 are at least partially staggered in the horizontal direction, as shown in FIG. Fig.18 Thus, even if the insertion portion 1211 enters the insertion hole 1131 in the vertical direction, the anti-slip portion 1212 cannot pass through the insertion hole 1131, and the end plate 12 must first be horizontally moved to one side to align the anti-slip portion 1212 with the insertion hole 1131, so that the anti-slip portion 1212 can slip out of the insertion hole 1131 in the reverse direction.

[0108] In this way, the cooperation between the inserting tongue 121 and the limiting hole 113 can play a good limiting role on the end plate 12, which is helpful to prevent the end plate 12 from being separated from the front side plate 114 during the inspection and replacement process.

[0109] In some exemplary embodiments, the guide ring 4 includes: a guide plate 41 and a mounting plate 42, such as Figure 6 shown.

[0110] The guide plate 41 is sleeved in the installation opening 311 and surrounds an air inlet and outlet 411. The air inlet 411 may be substantially in the shape of a bell mouth to guide the airflow into the wind wheel 6.

[0111] The mounting plate 42 is connected to the radial outer end of the guide plate 41 and is detachably connected to the volute 3. The fixing frame 51 is fixed to the mounting plate 42.

[0112] In some exemplary embodiments, the mounting plate 42 includes: a connecting cover plate 421 and a side panel 422, such as Fig.11 shown.

[0113] The connecting cover plate 421 is connected to the radial outer end of the guide plate 41 and covers a part of the installation opening 311. In this way, the size of the installation opening 311 can be set relatively large, which is convenient for disassembly of the wind wheel 6 and the motor 7.

[0114] The side panel 422 is connected to the radial outer end of the connecting cover plate 421 and is sleeved on the radial outer side of the mounting opening 311 ; the side panel 422 is detachably connected to the volute 3 , and the fixing frame 51 is fixed to the connecting cover plate 421 and / or the side panel 422 .

[0115] The side panels 422 can serve as wind shields to prevent air leakage from occurring in the gap between the guide ring 4 and the volute 3 .

[0116] In some exemplary embodiments, the volute 3 is provided with a first flange 312, such as Figure 5 and Fig.11 The first flange 312 is arranged along the circumference of the installation opening 311. The plate surface of the connecting cover plate 421 facing the installation opening 311 is provided with a second flange 4211, and the second flange 4211 abuts against the first flange 312, as shown in FIG. Fig.11 shown.

[0117] The cooperation between the first flange 312 and the second flange 4211 can also play a wind-blocking role, which is beneficial to prevent air leakage from occurring in the gap between the guide ring 4 and the volute 3 .

[0118] In some exemplary embodiments, the first flange 312 protrudes from the mounting opening 311 in a direction close to the connecting cover plate 421. Figure 5 The second flange 4211 abuts against the first flange 312 along the axial direction of the volute 3, as shown in FIG. Fig.11 shown.

[0119] The side panel 422 is sleeved on the outside of the first flange 312 and is in clearance fit with the first flange 312. Fig.11 This makes it easier for the guide ring 4 to rotate relative to the volute 3.

[0120] In some exemplary embodiments, the volute 3 is provided with an end cover 31, such as Figure 5 As shown, the end cover 31 is provided with a mounting opening 311. The end cover 31 is provided with a first connection portion, the guide ring 4 is provided with a second connection portion, and the guide ring 4 and the end cover 31 are connected through the first connection portion and the second connection portion.

[0121] The specific forms of the first connection part and the second connection part are not limited, and may include but are not limited to: a snap-on structure, a fastener connection structure, a plug-in structure, etc.

[0122] In some exemplary embodiments, the first connecting portion includes a plurality of first buckles 313 arranged at intervals, such as Figure 5 The first buckle 313 and the end cover 31 enclose a slot 314, as shown. Figure 5 The second connecting portion includes a plurality of second buckles 423, such as Figure 6 The second buckle 423 is configured to rotate in and out of the slot 314 along the circumferential direction of the guide ring 4 .

[0123] The first clip 313 cooperates with the second clip 423 to achieve a clamping and fixing effect, and facilitates the rotation of the guide ring 4 relative to the volute 3 .

[0124] The first buckle 313 may be substantially L-shaped, and the second buckle 423 may be substantially block-shaped. The number of the first buckles 313 may be multiple (such as two, three, four or more), and the multiple first buckles 313 are arranged at intervals along the circumference of the guide ring 4. The number of the second buckles 423 may be equal to the number of the first buckles 313 and correspond one to one.

[0125] In some exemplary embodiments, at least one first buckle 313 is fixedly connected to the corresponding second buckle 423 via a fastener.

[0126] In this way, the connection reliability between the guide ring 4 and the volute 3 can be improved, and the guide ring 4 can be effectively prevented from being loosened.

[0127] In one example, one of the first buckles 313 is provided with a first connection hole 3131, such as Figure 5 The corresponding second buckle 423 is provided with a second connecting hole 4231, as shown in FIG. Figure 6 The fasteners are inserted into the first connection hole 3131 and the second connection hole 4231 to fix the guide ring 4 and the volute 3 .

[0128] In some exemplary embodiments, the slot 314 is closed along one end of the circumference of the guide ring 4, such as Figure 5 As shown, the rotation range of the guide ring 4 relative to the volute 3 is limited.

[0129] Since one end of the slot 314 is closed, the second buckle 423 can only enter and exit from the other end of the slot 314, and can only rotate to the closed end of the adjacent slot 314 at most. Therefore, the rotation amplitude of the guide ring 4 is determined by the distance between two adjacent slots 314. This can play a better positioning role in the rotation of the guide ring 4. When the guide ring 4 rotates from the first position to the second position, the second buckle 423 is disengaged from the slot 314 and rotates to abut against the adjacent first buckle 313, indicating that the guide ring 4 rotates to the second position. Conversely, when the guide ring 4 rotates from the second position to the first position, the second buckle 423 rotates in the opposite direction to enter the slot 314 and abut against the adjacent first buckle 313, indicating that the guide ring 4 rotates to the first position. This can save the process of manual positioning, further reducing the maintenance difficulty and maintenance workload of the fresh air module 100.

[0130] In one example, the number of the first clips 313 is three, and the number of the second clips 423 is three, then the rotation range of the guide ring 4 is approximately 120°, which can effectively ensure that the filter assembly 5 can be rotated to a position facing the first inspection buckle.

[0131] In some exemplary embodiments, at least one second buckle 423 is interference-fitted with the corresponding slot 314. The interference fit can play a good fixing role and is helpful to prevent the guide ring 4 from loosening.

[0132] In some exemplary embodiments, the fixing frame 51 extends along the circumference of the guide ring 4, and baffles 511 are provided at both ends of the fixing frame 51 in the circumferential direction. Figure 6 shown.

[0133] The volute 3 is provided with a sealing protrusion 315, such as Figure 5 The baffle 511, the sealing protrusion 315, the housing 1 and the inspection cover 2 enclose the air passage 34, as shown in FIG. Fig. 9 The air passage 34 is connected to the fresh air inlet 13 through the air inlet 34. The air inlet 32 ​​is connected to the air inlet 411 through the air passage 34. The filter 52 is arranged at one end of the air passage 34 close to the air inlet 411.

[0134] This helps to ensure that the fresh air output from the air inlet channel 32 can enter the wind wheel 6 through the filter 52 as much as possible, thereby preventing air leakage from affecting the filtering and purification effect of the fresh air.

[0135] In some exemplary embodiments, the baffle 511 is configured to abut against the filter screen 52. Figure 3 As shown, the filter screen 52 is prevented from being separated from the fixing frame 51. The baffle plate 511 extends radially along the guide ring 4, and the radial inner end of the baffle plate 511 is arranged to abut against the middle of the end surface of the filter screen 52, and the radial outer end of the baffle plate 511 is arranged to abut against the sealing protrusion 315.

[0136] In some exemplary embodiments, the fixing frame 51 and the guide ring 4 are an integrated structure, such as Figure 6 This can save the assembly process of the fixing frame 51 and help improve the connection reliability between the fixing frame 51 and the guide ring 4.

[0137] In other exemplary embodiments, please refer to Figures 19 to 21 As shown, the fixing frame 51 and the guide ring 4 are a split assembly structure. This makes it easy to reasonably design the structure of the guide ring 4 and the fixing frame 51 according to needs, and also makes it easy to replace the fixing frame 51 or the guide ring 4 according to needs.

[0138] In some embodiments, the guide ring 4 is provided with a limiting protrusion 424 and a plug hole 425. Fig.19 The fixing frame 51 is provided with a third buckle 512, as shown in FIG. Fig. 20 The third buckle 512 is configured to penetrate the insertion hole 425 and hook the end surface of the limiting protrusion 424, as shown. Fig.21 As shown, the fixing frame 51 is restricted from being separated from the guide ring 4 .

[0139] During installation, the third buckle 512 is directly aligned with the insertion hole 425 and inserted until the third buckle 512 hooks the limiting protrusion 424, so that the fixing frame 51 and the guide ring 4 can be assembled and fixed, which is very convenient. The third buckle 512 can be provided with a guiding inclined surface to guide the third buckle 512 to be inserted into the insertion hole 425.

[0140] The number of the third buckles 512 can be multiple (such as two, three, four or more), and the multiple third buckles 512 can be arranged at intervals along the circumference of the fixing frame 51. The number of the limiting protrusions 424 and the plug holes 425 can be equal to the number of the third buckles 512 and correspond one to one. The limiting protrusions 424 and the second buckles 423 are staggered in the circumferential direction of the guide ring 4, such as Fig.21 shown.

[0141] In one example, the number of the third buckles 512 is three, and the number of the limiting protrusions 424 and the number of the plug holes 425 are both three. Figures 19 to 21 shown.

[0142] In summary, the fresh air module and duct unit provided in the embodiments of the present application solve the problem of fresh air module maintenance caused by the limitation of the ceiling structure, while taking into account the aesthetics of the ceiling.

[0143] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0144] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0145] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0146] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0147] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0148] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A fresh air module, characterized in that: include: A housing, wherein the housing is provided with a first inspection port; An inspection cover plate, detachably covering the first inspection opening; A volute, wherein one axial end of the volute is provided with a mounting opening, and the mounting opening faces the first inspection port; A guide ring is sleeved on the installation opening and surrounds an air inlet communicated with the installation opening; the guide ring is detachably connected to the volute and can enter and exit the housing through the first inspection port; and The filter assembly comprises a fixing frame and a filter installed on the fixing frame, wherein the fixing frame is fixed to the guide ring.

2. The fresh air module according to claim 1, characterized in that: The inspection cover covers a portion of the installation opening, and the housing comprises: A shell, wherein the shell is provided with the first inspection opening and an avoidance notch, wherein the avoidance notch is adjacent to and integrally connected to the first inspection opening; and The end plate is covered at the avoidance gap and covers another part of the installation opening, and is configured to press the filter assembly.

3. The fresh air module according to claim 2, characterized in that: The volute is also provided with an air inlet passage, which is located radially outside the mounting opening and communicated with the air inlet; the filter is located radially outside the air inlet and between the air inlet passage and the air inlet; the guide ring is rotatably sleeved on the mounting opening, and the guide ring is configured to be rotatable between a first position and a second position; Based on the guide ring rotating to the first position, the filter assembly is at least partially blocked by the end plate and pressed by the end plate; Based on the guide ring rotating to the second position, the filter assembly is separated from the end plate and faces the first inspection port.

4. The fresh air module according to claim 3, characterized in that: The end plate is movably connected to the shell so that the end plate can press the filter assembly or be separated from the filter assembly.

5. The fresh air module according to claim 4, characterized in that: The shell is provided with a limiting hole, and the end of the end plate away from the inspection cover is provided with an insert tongue; the insert tongue is inserted and limited in the limiting hole, and can move relative to the limiting hole, so that the end plate can press the filter assembly or detach from the filter assembly.

6. The fresh air module according to any one of claims 1 to 5, characterized in that: The guide ring comprises: a guide plate, which is sleeved in the installation opening and surrounds the air inlet; and The mounting plate is connected to the radial outer end of the guide plate and is detachably connected to the volute, and the fixing frame is fixed to the mounting plate.

7. The fresh air module according to claim 6, characterized in that: The mounting plate comprises: a connecting cover plate connected to the radial outer end of the guide plate and covering a portion of the mounting opening; and The side panel is connected to the radial outer end of the connecting cover plate and is sleeved on the radial outer side of the mounting opening. The side panel is detachably connected to the volute, and the fixing frame is fixed to the connecting cover plate and / or the side panel.

8. The fresh air module according to claim 7, characterized in that: The volute is provided with a first flange, and the first flange is arranged along the circumference of the mounting opening; The plate surface of the connecting cover plate facing the installation opening is provided with a second flange, and the second flange abuts against the first flange.

9. The fresh air module according to any one of claims 1 to 5, characterized in that: The volute is provided with an end cover, and the end cover is provided with the installation opening; The end cover is provided with a first connecting portion, the guide ring is provided with a second connecting portion, and the guide ring and the end cover are connected through the first connecting portion and the second connecting portion.

10. The fresh air module according to claim 9, characterized in that: The first connection portion includes a plurality of first buckles arranged at intervals, and the first buckles and the end cover enclose a slot. The second connection portion includes a plurality of second buckles, and the second buckles are arranged to rotate in and out of the slot along the circumference of the guide ring.

11. The fresh air module according to claim 10, characterized in that: At least one of the first buckles is fixedly connected to the corresponding second buckle via a fastener; and / or The clamping groove is closed along one end of the guide ring in the circumferential direction to limit the rotation range of the guide ring relative to the volute.

12. The fresh air module according to any one of claims 1 to 5, characterized in that: The fixing frame extends along the circumference of the guide ring, and baffles are provided at both ends of the fixing frame in the circumferential direction; The volute is provided with a sealing protrusion, and the baffle, the sealing protrusion, the outer shell and the inspection cover together enclose an air passage connected to the fresh air inlet, the air passage is connected to the air inlet, and the filter is arranged at one end of the air passage close to the air inlet.

13. The fresh air module according to any one of claims 1 to 5, characterized in that: The fixing frame and the guide ring are an integrated structure; or The fixing frame and the guide ring are a split assembly structure.

14. The fresh air module according to any one of claims 1 to 5, characterized in that: The guide ring is provided with a limiting protrusion and a plug hole; The fixing bracket is provided with a third buckle, and the third buckle is configured to penetrate the insertion hole and hook the end surface of the limiting protrusion to limit the fixing bracket from being separated from the guide ring.

15. A duct machine, arranged to be concealed in a suspended ceiling, characterized in that: The duct machine comprises: A duct machine body, wherein the duct machine body is provided with a return air outlet; and The fresh air module as described in any one of claims 1 to 14 is arranged on one side of the length direction of the duct machine body and is connected to the duct machine body; the suspended ceiling is provided with a second inspection port, the second inspection port is arranged corresponding to the air inlet and the inspection cover, and the area of ​​the second inspection port is larger than the total area of ​​the return air port and the inspection cover.

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