Ducted fan

Abstract

The application discloses a ducted air conditioner, which comprises a fresh air module, the fresh air module comprises a shell, a fan, a ventilation cavity and a filter screen assembly, the shell is provided with a first air inlet, the fan comprises a volute and an impeller, the volute is arranged in the shell, the impeller is arranged in the volute, the ventilation cavity is formed in the volute, the ventilation cavity is provided with a third air inlet, outdoor fresh air enters indoor through the ventilation cavity, the third air inlet, the impeller, the volute and the first air inlet in sequence, the filter screen assembly is arranged in the shell, and the filter screen assembly is located between the third air inlet and the air inlet end of the impeller in the flow direction of the fresh air flowing from the third air inlet to the impeller; wherein a pull-out opening is arranged on the side wall of the shell in the radial direction of the impeller, the pull-out opening and the fourth air inlet are located on the same side of the shell; the filter screen assembly is arc-shaped, the curvature radius of the filter screen assembly is greater than that of the impeller, the filter screen assembly is movably arranged in the shell through the pull-out opening, the filter screen assembly can block the pull-out opening, and a part of the filter screen assembly is exposed outside the shell.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment technology, and in particular to a duct air conditioner. Background Technology

[0002] A ducted air conditioner indoor unit, or simply a ducted unit, is a type of air conditioner indoor unit that is typically installed inside a suspended ceiling to supply air into the room for heat exchange. With the continuous optimization of air conditioner performance, many existing ducted units now integrate a fresh air module, thus enabling them to provide fresh air and improve indoor air quality.

[0003] Typically, fresh air modules are equipped with filters to ensure the quality of the fresh air. Generally, fresh air inevitably contains impurities such as dust and lint, which can cause the filters to become clogged after prolonged use. Therefore, the filters need to be replaced regularly to maintain their filtration effectiveness.

[0004] To achieve a replaceable filter design, most fresh air modules in related technologies use screws and sheet metal parts to install the filter inside the module, allowing it to be removed and replaced after a period of use. However, installing or removing the filter requires a considerable amount of time to handle the screws and sheet metal parts, making the process inconvenient and hindering filter replacement. Utility Model Content

[0005] This application discloses a duct air conditioner that can improve the efficiency of disassembly and assembly of filter components, enabling the filter components to be replaced quickly and conveniently, thus improving the ease of replacement and saving time and effort.

[0006] To achieve the above objectives, this application discloses a ducted air conditioning unit, which includes a fresh air module, the fresh air module comprising: The outer casing has a first air vent. The fan includes: A volute, which is disposed inside the outer shell, has an air inlet and an air outlet; The wind turbine is disposed inside the volute. A ventilation cavity is formed inside the volute. The ventilation cavity has a second air inlet and a third air inlet. Fresh outdoor air enters the room sequentially through the second air inlet, the ventilation cavity, the third air inlet, the impeller, the volute, and the first air inlet. A filter assembly is disposed inside the housing, and in the direction of fresh air flow from the third air inlet to the impeller, the filter assembly is located between the third air inlet and the air inlet of the impeller. The outer casing has a pull-out opening on the radial side wall of the wind turbine, and the pull-out opening and the second air outlet are located on the same side of the outer casing. The filter assembly is arc-shaped, with a radius of curvature greater than that of the air inlet. The center of the arc of the filter assembly does not coincide with the center of the air inlet. The filter assembly is movably and detachably installed inside the housing through the pull-out opening, and the filter assembly can block the pull-out opening, with a portion protruding outside the housing.

[0007] In the duct air conditioner provided in this application embodiment, a pull-out port is provided on the side wall of the outer casing, and the radius of curvature of the arc-shaped filter assembly is greater than that of the air inlet. Furthermore, the center of curvature of the filter assembly does not coincide with the center of curvature of the air inlet. This avoids difficulties in pulling out the filter assembly, allowing it to be movably and detachably installed inside the outer casing by passing through the pull-out port. When the filter assembly is inserted into the outer casing from the pull-out port, it blocks the pull-out port, and a portion of the filter assembly is located outside the outer casing. Therefore, when it is necessary to disassemble or install the filter assembly, it can be easily removed by... The filter assembly can be quickly disassembled and installed by pulling the exposed portion of the filter assembly along its circumference. This means that operators can disassemble and install the filter assembly from outside the fresh air module without first removing the inspection cover. Compared to using screws and sheet metal parts to fix the filter assembly, there is no need to remove screws and sheet metal parts. The operation is very simple and convenient, greatly simplifying the disassembly and assembly process of the filter assembly. It enables quick replacement of the filter assembly, improves the convenience of filter replacement, and saves time and effort.

[0008] In addition, placing the pull-out port and the second air vent on the same side of the casing can prevent the filter assembly from interfering with other components (such as the body of the ducted air conditioner, the wall, etc.) during the pull-out process when the fresh air module is installed on the indoor ceiling, thus facilitating the pull-out operation of the filter assembly. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of the fresh air module disclosed in the embodiments of this application; Figure 2 This is a schematic diagram of the fresh air module disclosed in the embodiments of this application from another perspective; Figure 3 This is a structural schematic diagram of the fresh air module disclosed in the embodiments of this application from another perspective; Figure 4 The fresh air module disclosed in the embodiments of this application is along Figure 3 One of the three-dimensional sectional views along the AA direction; Figure 5 The fresh air module disclosed in the embodiments of this application is along Figure 3 The second three-dimensional sectional view along the AA direction; Figure 6 The fresh air module disclosed in the embodiments of this application is along Figure 3 A three-dimensional sectional view along the BB direction; Figure 7 yes Figure 6 A schematic diagram of the decomposed structure; Figure 8 This is a top view of the fresh air module disclosed in the embodiments of this application; Figure 9 The fresh air module disclosed in the embodiments of this application is along Figure 8 A cross-sectional view along the CC direction in the image; Figure 10 This is a schematic diagram of the internal structure of the fresh air module disclosed in the embodiments of this application; Figure 11 yes Figure 10 A schematic diagram of the decomposed structure; Figure 12 yes Figure 10 Top view; Figure 13 yes Figure 12 A simplified structural diagram; Figure 14 This is a schematic diagram of the internal structure of the fresh air module disclosed in the embodiments of this application from another perspective; Figure 15 yes Figure 14 A schematic diagram of the decomposed structure; Figure 16 This is a schematic diagram of the internal structure of the fresh air module (not shown) disclosed in the embodiments of this application; Figure 17 This is a schematic diagram of the structure of the filter assembly disclosed in the embodiments of this application; Figure 18 This is an exploded structural diagram of the filter assembly disclosed in the embodiments of this application.

[0011] Explanation of main figure symbols 100 - Fresh air module; 11 - Outer shell; 11a - First side wall; 11b - Second side wall; 11c - Third side wall; 111 - First air outlet; 112 - Fourth air outlet; 113 - Pull-out opening; 114 - Limiting groove; 12 - Fan; 121 - Volute; 1211 - Air inlet; 1212 - Air outlet; 1213 - First guide rail; 1213a - First guide rib; 1214 - Arc-shaped guide plate; 122 - Impeller; 13 - Ventilation cavity; 131 - Second air outlet; 132 - Third air outlet; 133 - Fifth air outlet; 14 - Filter assembly; 14a - First side; 14b - Second side; 14c - First circumferential side; 14d - Second circumferential side; 14e - First end; 14f - Second end; 141 - Filter frame; 142 - Filter screen; 143 - Handle; 1431 - Connecting plate; 1431a - First edge; 1431b - Second edge; 1431c - Third plate; 1431d - Fourth plate; 1431e - Second slot; 1431f - Hook; 1432 - Handle; 144 - Limiting baffle; 144a - First limiting baffle; 144a1 - First plate; 144a2 - Second plate; 144b - Second limiting baffle; 144b1 - First slot; 144b2 - Support protrusion; 15 - Duct connector; 16 - Sealing component; 17 - First elastic layer. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this application clearer, the exemplary embodiments of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments. Obviously, the described exemplary embodiments are only some embodiments of this application, and not all embodiments. That is, the specific embodiments described herein are merely used to explain this application and are not intended to limit this application.

[0013] It should be noted that the brief descriptions of terminology used in this application are merely for the purpose of facilitating understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0014] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0015] The terms "first," "second," etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first air vent may be referred to as a second air vent, and similarly, a second air vent may be referred to as a first air vent. Both the first air vent and the second air vent are air vents, but they are not the same air vent.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0018] In the description of this application, it should be noted that the singular forms of "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that terms such as "comprising / including" or "having" specify the presence of the stated features, integrals, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integrals, steps, operations, components, parts, or combinations thereof.

[0019] In addition, the term "and / or" as used in this specification includes any and all combinations of the related listed items. For example, A and / or B can mean: A alone, A and B together, or B alone. That is, the term "and / or" as used in this specification includes any and all combinations of the related listed items.

[0020] As analyzed in the background section, the fresh air modules of ducted air conditioners in related technologies all feature removable filters, allowing for replacement after a period of use. However, installing or removing the filters requires a considerable amount of time to handle screws and sheet metal parts, making the process time-consuming, inconvenient, and affecting filter replacement. Furthermore, removing or installing the filters typically requires first removing the access cover before the filters can be removed or installed, making the process cumbersome. In other words, to remove or install the filters, the access cover must be removed first before the filters inside the fresh air module can be manually removed, a new filter installed, and finally the fresh air module secured with screws, making the filter removal and installation process quite troublesome.

[0021] In addition, during the disassembly and assembly process, users may find that the connection between the access cover and the outer shell of the fresh air module is not properly sealed, resulting in air leakage. This can cause condensation and dripping water at the connection between the access cover and the outer shell in low temperature and high humidity environments, leading to user dissatisfaction.

[0022] In addition, most fresh air modules, like ducted air conditioners, are ceiling-mounted, which means that removing and installing the filter requires climbing to a height. Since the filter is a part that is replaced frequently, the inconvenience of removing and installing the filter can easily lead to user dissatisfaction.

[0023] In view of this, the present application provides a duct air conditioner that can improve the convenience of replacing the filter assembly. In the fresh air module of the duct air conditioner, it is not necessary to remove the inspection cover before disassembling the filter assembly. Therefore, it can avoid the situation where the inspection cover is not sealed properly due to improper disassembly and assembly by the user, which can easily cause condensation and dripping water at the inspection cover in low temperature and high humidity environment.

[0024] In this application, the ducted air conditioner is the indoor unit of an air conditioner, and its working principle is the same as that of other air conditioners (such as the indoor units of wall-mounted or floor-standing air conditioners).

[0025] In other words, an air conditioner typically consists of a duct unit (i.e., an indoor unit) and an outdoor unit. The air conditioner performs a refrigeration cycle in the indoor unit by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0026] The compressor compresses the refrigerant gas at a low temperature and low pressure, discharging it as a high temperature and high pressure gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0027] The expansion valve causes the high-temperature, high-pressure liquid refrigerant condensed in the condenser to expand into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the ducted air conditioner can regulate the temperature of the indoor space.

[0028] The outdoor unit of an air conditioner includes the compressor and outdoor heat exchanger of the refrigeration cycle, while the indoor unit includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0029] Indoor and outdoor heat exchangers can be used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the ducted air conditioner is used as a heater in heating mode. When the indoor heat exchanger is used as an evaporator, the ducted air conditioner is used as a cooler in cooling mode.

[0030] In some embodiments, in order to improve indoor air quality, ducted air conditioners typically have a fresh air function, for example, the ducted air conditioner integrates a fresh air module, that is, the ducted air conditioner includes a fresh air module.

[0031] For example, a ducted air conditioning unit may include a main unit and a fresh air module connected to the main unit. The main unit is the indoor unit mentioned above.

[0032] The technical solutions of some embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Please see Figure 1 and Figure 2 The fresh air module 100 provided in this application embodiment includes a housing 11, which serves as an external protective component for the fresh air module 100. Its internal space can be used to accommodate various functional components of the fresh air module 100, such as the fan and filter assembly mentioned later. The housing 11 has a first air vent 111.

[0034] like Figure 3 and Figure 4As shown, in some embodiments, the fresh air module 100 provided in this application includes a fan 12 and a ventilation cavity 13.

[0035] like Figure 5 and Figure 6 As shown in this application, the fan 12 may include a volute 121 and a fan wheel 122. The volute 121 is disposed inside the outer casing 11 and has an air inlet 1211 and an air outlet 1212. The air outlet 1212 can communicate with the first air outlet 111. The fan wheel 122 is disposed inside the volute 121.

[0036] In this application, a ventilation cavity 13 is formed within a volute 121, and the ventilation cavity 13 has a second air vent 131 and a third air vent 132, wherein the second air vent 131 is connected to the outside, and the third air vent 132 is connected to an air inlet 1211. When the impeller 122 is operating, fresh air from the outside can sequentially enter the room through the second air vent 131, the ventilation cavity 13, the third air vent 132, the air inlet 1211, the impeller 122, the air outlet 1212, and the first air vent 111 to maintain fresh indoor air.

[0037] In some embodiments, the fresh air module 100 provided in this application includes a filter assembly 14, which is disposed inside the housing 11. The filter assembly 14 is located between the third air outlet 132 and the air inlet of the impeller 122 in the direction of fresh air flow from the third air outlet 132 to the impeller 122. This allows the fresh air to be filtered by the filter assembly 14 before passing through the impeller 122, preventing dust, lint, and other impurities from being mixed in with the fresh air. This ensures the quality of the fresh air entering the room and prevents dust, lint, and other impurities from adhering to the blades of the impeller 122, thus avoiding affecting the operation of the impeller 122 and ensuring its normal operation.

[0038] In some embodiments, the first air vent 111 and / or the air outlet 1212 can be opened and closed. That is, only the first air vent 111 can be opened and closed, only the air outlet 1212 can be opened and closed, or both the first air vent 111 and the air outlet 1212 can be opened and closed. Normally, whether the first air vent 111, the air outlet 1212, or both can be opened and closed, once at least one of them is closed, outdoor fresh air usually cannot enter the room. However, when both the first air vent 111 and the air outlet 1212 can be opened and closed, both the first air vent 111 and the air outlet 1212 need to be open for outdoor fresh air to enter the room. Moreover, the third air vent 132 can also be opened and closed, the outer casing 11 also has an openable and closable fourth air vent 112, and the ventilation cavity 13 also has an openable and closable fifth air vent 133.

[0039] When only the first air vent 111 can be opened and closed among the first air vent 111 and the air outlet 1212, in the fresh air module 100 in fresh air mode, the first air vent 111 and the third air vent 132 are in the open state, and the fourth air vent 112 and the fifth air vent 133 are in the closed state. The outdoor fresh air enters the room sequentially through the second air vent 131, the ventilation cavity 13, the third air vent 132, the filter assembly 14, the air inlet 1211, the impeller 122, the air outlet 1212 and the first air vent 111. In the fresh air module 100 in exhaust mode, the first air vent 111 and the third air vent 132 are in the closed state, and the fourth air vent 112 and the fifth air vent 133 are in the open state. The indoor air is exhausted to the outside sequentially through the fourth air vent 112, the air inlet 1211, the impeller 122, the air outlet 1212, the fifth air vent 133, the ventilation cavity 13 and the second air vent 131.

[0040] When only the air outlet 1212 can be opened and closed among the first air outlet 111 and the air outlet 1212, when the fresh air module 100 is in fresh air mode, the air outlet 1212 and the third air outlet 132 are in the open state, and the fourth air outlet 112 and the fifth air outlet 133 are in the closed state. The outdoor fresh air enters the room sequentially through the second air outlet 131, the ventilation cavity 13, the third air outlet 132, the filter assembly 14, the air inlet 1211, the impeller 122, the air outlet 1212, and the first air outlet 111. When the fresh air module 100 is in exhaust mode, the air outlet 1212 and the third air outlet 132 are in the closed state, and the fourth air outlet 112 and the fifth air outlet 133 are in the open state. The indoor air is exhausted to the outside sequentially through the fourth air outlet 112, the air inlet 1211, the impeller 122, the air outlet 1212, the fifth air outlet 133, the ventilation cavity 13, and the second air outlet 131.

[0041] When both the first air vent 111 and the air outlet 1212 can be opened and closed, in the fresh air module 100 in fresh air mode, the first air vent 111, the air outlet 1212 and the third air vent 132 are in the open state, and the fourth air vent 112 and the fifth air vent 133 are in the closed state. Outdoor fresh air enters the room sequentially through the second air vent 131, the ventilation cavity 13, the third air vent 132, the filter assembly 14, the air inlet 1211, the impeller 122, the air outlet 1212 and the first air vent 111. In the fresh air module 100 in exhaust mode, the first air vent 111, the air outlet 1212 and the third air vent 132 are in the closed state, and the fourth air vent 112 and the fifth air vent 133 are in the open state. Indoor air is exhausted to the outside sequentially through the fourth air vent 112, the air inlet 1211, the impeller 122, the air outlet 1212, the fifth air vent 133, the ventilation cavity 13 and the second air vent 131.

[0042] Taking the example where only the air outlet 1212 can be opened and closed among the first air vent 111 and the air outlet 1212, when fresh air needs to be introduced, the impeller 122 is activated. At this time, the air outlet 1212 and the third air vent 132 are in the open state, while the fourth air vent 112 and the fifth air vent 133 are in the closed state. The fresh outdoor air enters the room sequentially through the second air vent 131, the ventilation cavity 13, the third air vent 132, the air inlet 1211, the impeller 122, the air outlet 1212, and the first air vent 111, thereby improving the indoor air quality. To improve indoor air quality and enhance user comfort, when ventilation is required, the impeller 122 is activated. At this time, the air outlet 1212 and the third air outlet 132 are closed, while the fourth air outlet 112 and the fifth air outlet 133 are open. Indoor air is sequentially exhausted outdoors through the fourth air outlet 112, the air inlet 1211, the impeller 122, the air outlet 1212, the fifth air outlet 133, the ventilation cavity 13, and the second air outlet 131, thereby improving indoor air quality, effectively reducing the concentration of harmful gases indoors, and enhancing user comfort.

[0043] By opening and closing the air outlet 1212, the third air outlet 132, the fourth air outlet 112 and the fifth air outlet 133, the fresh air module 100 can switch between fresh air mode and exhaust mode. Only one ventilation cavity 13 and one fan 12 are needed to form a set of air duct system, which can deliver fresh outdoor air to the room and exhaust indoor stale air in a timely manner. The structure is simple, which reduces costs and volume, reduces the space occupied by the fresh air module 100, and facilitates installation and layout.

[0044] Optionally, a third air vent 132 may be formed on the surface of the volute 121 facing the bottom wall of the outer casing 11.

[0045] In some embodiments, to facilitate the introduction of fresh outdoor air into the room and the exhaust of stale indoor air to the outside, the fresh air module 100 further includes a duct connector 15 disposed on the housing 11. This duct connector 15 communicates with the end of the ventilation cavity 13 where the second air outlet 131 is located. In other words, an external fresh air duct (not shown) can be installed on the duct connector 15 to connect the fresh air duct to the ventilation cavity 13. Extending the length of the ventilation cavity 13 via the fresh air duct ensures that the fresh air module 100 can be applied to different areas. The fresh air duct extends outdoors to connect the ventilation cavity 13 with the outdoor environment.

[0046] In some embodiments, rotatable sealing members 16 may be provided at the air outlet 1212, the third air outlet 132, the fourth air outlet 112 and the fifth air outlet 133 respectively, so that the opening and closing of the air outlet 1212, the third air outlet 132, the fourth air outlet 112 and the fifth air outlet 133 can be controlled by rotating the sealing members 16.

[0047] like Figure 6 and Figure 7 As shown, in some embodiments, the housing 11 has a pull-out opening 113 on the radial side wall of the impeller 122, and the pull-out opening 113 and the second air outlet 131 are located on the same side of the housing 11.

[0048] In some embodiments, the filter assembly 14 is arc-shaped, and the radius of curvature of the filter assembly 14 is greater than the radius of curvature of the air inlet 1211. The center of the arc of the filter assembly 14 and the center of the circle of the air inlet 1211 do not coincide. The filter assembly 14 is movably and detachably disposed inside the housing 11 through the pull-out opening 113, and the filter assembly 14 can block the pull-out opening 113, with a portion exposed outside the housing 11.

[0049] By providing a pull-out opening 113 on the side wall of the housing 11, and making the radius of curvature of the arc-shaped filter assembly 14 larger than that of the air inlet 1211, and ensuring that the center of the arc of the filter assembly 14 does not coincide with the center of the circle of the air inlet 1211, the filter assembly 14 can be movably and detachably installed inside the housing 11 through the pull-out opening 113. This avoids difficulties in pulling out the filter assembly 14. When the filter assembly 14 is inserted into the housing 11 through the pull-out opening 113, the filter assembly 14 blocks the pull-out opening 113, and a portion of the filter assembly 14 is located outside the housing 11. Therefore, when it is necessary to disassemble or assemble the filter assembly 14, it can be easily removed. The filter assembly 14 can be quickly disassembled and assembled by pulling the part of the filter assembly 14 exposed outside the housing 11 along the circumference of the filter assembly 14. That is, the operator can disassemble and assemble the filter assembly 14 outside the fresh air module 100 without removing the inspection cover first. At the same time, compared with the method of fixing the filter assembly 14 with screws and sheet metal parts, there is no need to remove screws and sheet metal parts. The operation is very simple and convenient, which greatly simplifies the disassembly and assembly process of the filter assembly 14, enables the quick replacement of the filter assembly 14, improves the convenience of filter replacement, and saves time and effort.

[0050] In addition, placing the pull-out port and the second air vent on the same side of the casing can prevent the filter assembly from interfering with other components (such as the body of the ducted air conditioner, the wall, etc.) during the pull-out process when the fresh air module is installed on the indoor ceiling, thus facilitating the pull-out operation of the filter assembly.

[0051] In this application, an arc-shaped filter assembly 14 with a radius of curvature larger than that of the air inlet and whose center of curvature does not coincide with that of the air inlet is used, which can increase the filtration area of ​​the filter assembly 14 and improve the filtration efficiency.

[0052] The filter assembly 14 is partially exposed outside the outer casing 11. This can be understood as follows: part of the filter assembly 14 protrudes from the pull-out opening 113 and is located outside the outer casing. The part of the filter assembly 14 located outside the outer casing 11 can serve as a grip, making it easy to hold and pull out the filter assembly 14. Alternatively, it can be understood as follows: the filter assembly 14 does not protrude from the pull-out opening 113 and is located outside the outer casing 11. The filter assembly 14 is not blocked by the outer casing 11 through the pull-out opening 113. In this case, the surface of the filter assembly 14 exposed through the pull-out opening 113 can be provided with a groove, so as to hold the groove wall and pull out the filter assembly 14.

[0053] In some embodiments, the filter assembly 14 may include a filter frame 141 and a filter screen 142. The filter screen 142 is fixedly disposed within the filter frame 141. By disposing the filter screen 142 within the filter frame 141, the rigidity of the filter frame 141 can be used to support the filter screen 142, thereby preventing deformation of the filter screen 142.

[0054] In some embodiments, such as Figure 8 and Figure 9 As shown, a first elastic layer 17 is provided on the bottom wall of the outer casing 11 facing the filter assembly 14, and the first elastic layer 17 abuts against the first side portion 14a. This allows the filter assembly 14 to be interference-fitted between the volute 121 and the bottom wall of the outer casing 11, preventing fresh air from entering the impeller 122 directly from the connection between the filter assembly 14 and the volute 121, and the connection between the filter assembly 14 and the bottom wall of the outer casing 11 without passing through the filter assembly 14. This ensures that all outdoor fresh air can be purified by the filter assembly 14 before entering the impeller 122, thereby helping to ensure the quality of fresh air entering the room and preventing dust, lint, and other impurities in the fresh air from adhering to the blades of the impeller 122 and affecting the operation of the impeller 122, thus helping to ensure the normal operation of the impeller 122.

[0055] Furthermore, even if the filter assembly 14 has been pulled and replaced multiple times, causing wear on the volute 121 and increasing the distance between the volute 121 and the bottom wall of the outer shell 11, the first elastic layer 17 can restore the deformation and compensate for the increased distance between the volute 121 and the bottom wall of the outer shell 11. This allows the filter assembly 14 to still be interference-fitted between the volute 121 and the bottom wall of the outer shell 11, preventing fresh air from entering the impeller 122 directly from the connection between the filter assembly 14 and the volute 121, and the connection between the filter assembly 14 and the bottom wall of the outer shell 11 without passing through the filter assembly 14. This ensures that all outdoor fresh air can be purified by the filter assembly 14 before entering the impeller 122, thereby helping to ensure the quality of the fresh air entering the room and preventing dust, lint, and other impurities in the fresh air from adhering to the blades of the impeller 122 and affecting its operation, thus helping to ensure the normal operation of the impeller 122.

[0056] Optionally, the first elastic layer 17 may be, but is not limited to, a sponge layer, a silicone layer, a plastic layer, a rubber layer, or a foam layer, etc.

[0057] In some embodiments, a second elastic layer (not shown) is provided on the surface of the volute 121 facing the filter assembly 14, and the second elastic layer abuts against the second side portion 14b. This allows the filter assembly 14 to be interference-fitted between the volute 121 and the bottom wall of the outer casing 11, preventing fresh air from bypassing the filter assembly 14 and directly entering the impeller 122 from the connection between the filter assembly 14 and the volute 121, and the connection between the filter assembly 14 and the bottom wall of the outer casing 11. This ensures that all outdoor fresh air is purified by the filter assembly 14 before entering the impeller 122, thereby helping to ensure the quality of fresh air entering the room and preventing dust, lint, and other impurities in the fresh air from adhering to the blades of the impeller 122 and affecting the operation of the impeller 122, thus helping to ensure the normal operation of the impeller 122.

[0058] Furthermore, even if the filter assembly 14 has been pulled and replaced multiple times, causing wear on the bottom wall of the outer casing 11 and increasing the distance between the volute 121 and the bottom wall of the outer casing 11, the deformation can be restored by the second elastic layer to compensate for the increased distance between the volute 121 and the bottom wall of the outer casing 11. This allows the filter assembly 14 to still be interference-fitted between the volute 121 and the bottom wall of the outer casing 11, preventing fresh air from entering the impeller 122 directly from the connection between the filter assembly 14 and the volute 121, and the connection between the filter assembly 14 and the bottom wall of the outer casing 11 without passing through the filter assembly 14. This ensures that all outdoor fresh air can be purified by the filter assembly 14 before entering the impeller 122, thereby helping to ensure the quality of the fresh air entering the room and preventing dust, lint, and other impurities in the fresh air from adhering to the blades of the impeller 122 and affecting its operation, thus helping to ensure the normal operation of the impeller 122.

[0059] Optionally, the second elastic layer may be, but is not limited to, a sponge layer, a silicone layer, a plastic layer, a rubber layer, or a foam layer, etc.

[0060] It is understood that in other embodiments, the first elastic layer 17 and the second elastic layer may coexist.

[0061] In this application, as Figure 10 and Figure 11As shown, the filter assembly 14 has a first side 14a and a second side 14b opposite to each other along the axial direction of the impeller 122, wherein the first side 14a is closer to the volute 121 than the second side 14b in the axial direction of the impeller 122; the filter assembly 14 also has a first circumferential side 14c and a second circumferential side 14d opposite to each other in the radial direction, wherein the first circumferential side 14c is generally the windward side of the filter assembly 14, and the second circumferential side 14d is generally the leeward side of the filter assembly 14. When the fresh air module 100 is in fresh air mode, fresh air enters the filter assembly 14 from the first circumferential side 14c and exits from the second circumferential side 14d into the air inlet 1211 of the volute 121; and the filter assembly 14 also has a first end 14e and a second end 14f opposite to each other in the circumferential direction, wherein the filter assembly 14 is inserted into the housing 11 from the pull-out port 113 from the first end 14e, and the second end 14f blocks the pull-out port 113.

[0062] In this application, the outer casing 11 has opposing first sidewalls 11a and second sidewalls 11b, wherein the first sidewalls 11a and second sidewalls 11b are arranged opposite each other along the opening direction of the second air vent 131, and the pull-out opening 113 is formed on the first sidewall 11a.

[0063] In this application, for ease of description, such as Figure 12 and Figure 13 As shown, the inner diameter of the filter assembly 14 is defined as R, which is also the radius of the arc containing the leeward side of the filter assembly 14. In other words, the distance between the leeward side of the filter assembly 14 and the center O1 of the arc of the filter assembly 14 in the radial direction is defined as R. The central angle of the filter assembly 14 is defined as θ, and the chord length of the filter assembly 14 is defined as L. R Let r be the radius of the air inlet 1211 of the volute 121, and let L be the minimum distance between the filter assembly 14 and the center O2 of the air inlet 1211 along the radial direction of the air inlet 1211. Let the side wall of the outer casing facing the leeward side of the filter assembly be defined as the third side wall 11c, and let L be the distance between the pull-out port 113 and the third side wall 11c. A .

[0064] It is understood that the above definitions are merely for ease of description and should not be used to limit the scope of protection of this application.

[0065] In some embodiments, 54°≤θ≤88°, for example, 54°≤θ≤60°, 60°≤θ≤65°, 65°≤θ≤70°, 70°≤θ≤75°, 75°≤θ≤80° or 80°≤θ≤88°, etc., and exemplaryly, θ=54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, 86°, 87° or 88°, etc.

[0066] When the above relationship is satisfied, it can ensure that the filter assembly 14 has a large filtration area, and can also prevent the filter assembly 14 from interfering with other components (such as the first sidewall 11a and the electrical control box installed on the first sidewall 11a, etc.) during the process of pulling out the filter assembly 14 and during the process of assembling the filter assembly 14, so as to facilitate the installation and pulling out of the filter assembly 14 and reduce the difficulty of installing and pulling out the filter assembly 14.

[0067] In some embodiments, 272mm≤R≤731mm, for example, 272mm≤R≤300mm, 301mm≤R≤331mm, 332mm≤R≤393mm, 394mm≤R≤431mm, 432mm≤R≤491mm, 492mm≤R≤531mm, 532mm≤R≤588mm, 589mm≤R≤611mm, 612mm≤R≤673mm, 674mm≤R≤701mm, or 701mm≤R≤731mm, etc. For example, R = 272mm, 275mm, 300mm, 301mm, 320mm, 331mm, 332mm, 350mm, 375mm, 393mm, 394mm, 400mm, 410mm, 425mm, 431mm, 432mm, 450mm, 475mm, 491mm, 492mm, 500mm, 515mm, 531mm, 532mm, 550mm, 565mm, 588mm, 589mm, 600mm, 605mm, 611mm, 612mm, 630mm, 650mm, 656mm, 673mm, 674mm, 685mm, 700mm, 701mm, 715mm, 720mm, 730mm or 731mm, etc.

[0068] If R < 272mm, the filter assembly 14 may interfere with the third air vent 132, blocking the third air vent 132 and affecting its ventilation rate. The filter assembly 14 may even divide the third air vent 132 into two parts, with one part located on the windward side of the filter assembly 14 and the other part located on the leeward side of the filter assembly 14. The fresh air coming out from the part of the air vent located on the leeward side of the filter assembly 14 will be directly sucked in by the impeller 122 and blown into the room, affecting the quality of the fresh air.

[0069] If R > 731 mm, the filter assembly 14 will be too close to the center O2 of the air inlet 1211, which will make the air inlet 1211 of the volute 121 too small, thereby affecting the ventilation rate of the air inlet 1211 and reducing the air volume of the fresh air module 100.

[0070] Therefore, when 272mm≤R≤731mm, the ventilation rate of the third air outlet 132 and the air inlet 1211 can be taken into account at the same time, avoiding the ventilation rate of the third air outlet 132 and the air inlet 1211 being too low, so that the fresh air module 100 has a large air volume, thereby enabling the fresh air module 100 to effectively and timely improve the indoor air.

[0071] Additionally, when 272mm≤R≤731mm and 54°≤θ≤88°, L can be satisfied. R >L A And can increase the chord length L of the filter assembly 14 R The diameter is controlled within the range of 377mm-389mm, so that during the process of pulling out the filter assembly 14 and during the assembly of the filter assembly 14, interference between the filter assembly 14 and other components (such as the first side wall 11a and the electrical control box installed on the first side wall 11a, etc.) can be avoided, which facilitates the installation and pulling out of the filter assembly 14 and reduces the difficulty of installing and pulling out the filter assembly 14.

[0072] Specifically, in some embodiments, 377mm≤L R ≤389mm, for example, 377mm≤L R ≤379mm, 379mm≤L R ≤381mm, 381mm≤L R ≤383mm, 383mm≤L R ≤385mm, 385mm≤L R ≤387mm or 387mm≤L R ≤389mm, etc. For example, L R=377mm, 378mm, 379mm, 380mm, 381mm, 382mm, 383mm, 384mm, 385mm, 386mm, 387mm, 388mm or 389mm, etc.

[0073] If L R If the length of the filter assembly 14 is less than 377mm, then the chord length L is... R The distance L between the pull-out opening 113 and the third sidewall 11c of the outer casing is less than the distance between them. A That is, L R <L A This causes the filter assembly 14 to interfere with the first side wall 11a and the electrical control box installed on the first side wall 11a during the pulling process, affecting the pulling of the filter assembly 14. Conversely, it also increases the difficulty of inserting the filter assembly 14 into the housing from the pull-out port 113 when assembling the filter assembly 14.

[0074] If L R If the diameter is greater than 389mm, a larger space needs to be reserved around the outer casing to avoid interference between the filter assembly 14 and the wall during the pulling and installation process.

[0075] Therefore, when 377mm≤L R When the thickness is ≤389mm, interference between the filter assembly 14 and other components (e.g., the first sidewall 11a, the electrical control box installed on the first sidewall 11a, and the wall, etc.) can be avoided, which facilitates the installation and removal of the filter assembly 14 and reduces the difficulty of installing and removing the filter assembly 14.

[0076] In some embodiments, 0 ≤ rL ≤ r / 2, for example, 0 ≤ rL ≤ r / 18, 0 ≤ rL ≤ r / 16, r / 16 ≤ rL ≤ r / 14, r / 14 ≤ rL ≤ r / 12, r / 12 ≤ rL ≤ r / 10, r / 10 ≤ rL ≤ r / 8, r / 8 ≤ rL ≤ r / 4, or r / 4 ≤ rL ≤ r / 2, etc. For example, L = 0, r / 50, r / 40, r / 30, r / 20, r / 19, r / 18, r / 17, r / 16, r / 15, r / 14, r / 13, r / 12, r / 11, r / 10, r / 9, r / 8, r / 7, r / 6, r / 5, r / 4, r / 3, or r / 2, etc.

[0077] Understandably, when rL=0, L=r, and the leeward side of the filter assembly 14 is tangent to the air inlet 1211; when rL<0, the leeward side of the filter assembly 14 is spaced apart from the air inlet 1211; when rL>0, at least the leeward side of the filter assembly 14 intersects with the air inlet 1211, and part of the air inlet 1211 is blocked.

[0078] If rL≤0, the filter assembly 14 is far from the center of the air inlet 1211, exposing the entire air inlet 1211. Furthermore, the applicant's research revealed that airflow from the impeller 122 will exit from the edge of the air inlet 1211, resulting in air leakage and reducing the airflow of the fresh air module 100. Additionally, the filter assembly 14 may interfere with the third air outlet 132, obstructing its ventilation rate. The filter assembly 14 may even divide the third air outlet 132 into two parts, with one part on the windward side and the other on the leeward side. Fresh air from the leeward part of the air outlet will be directly drawn into the impeller 122 and blown into the room, affecting the quality of the fresh air.

[0079] If rL > r / 2, the filter assembly 14 will be too close to the center of the air inlet 1211, which will make the air inlet 1211 of the volute 121 too small, thereby affecting the ventilation rate of the air inlet 1211 and reducing the air volume of the fresh air module 100.

[0080] Therefore, when 0 < L ≤ r / 2, the edge area of ​​the air inlet 1211 can be blocked to reduce the amount of air leaking from the edge area of ​​the air inlet 1211, thereby improving the air leakage and increasing the air volume of the fresh air module 100. At the same time, it can ensure the ventilation rate of the third air outlet 132 and the air inlet 1211, avoiding the ventilation rate of the air inlet 1211 being too low, so that the fresh air module 100 has a large air volume, thereby enabling the fresh air module 100 to effectively and timely improve the indoor air.

[0081] In some embodiments, the volute 121 has a shielding portion extending from the side facing the bottom wall of the outer casing 11 toward the center of the air inlet 1211 to shield part of the air inlet 1211, and the filter assembly 14 has a portion corresponding to the shielding portion.

[0082] In some embodiments, such as Figure 11 and Figure 12 As shown, the volute 121 is provided with a first guide rail 1213 whose shape is adapted to the filter assembly 14. The first side 14a of the filter assembly 14 cooperates with the first guide rail 1213 and can slide relative to the first guide rail 1213. The first guide rail 1213 guides the movement of the filter assembly 14 when it is inserted or pulled out, preventing unnecessary deflection, tilting or shaking of the filter assembly 14. This facilitates the smooth installation and removal of the filter assembly 14, reduces the difficulty of installation and removal, and makes it easier to replace the filter assembly 14.

[0083] In addition, since the first side 14a of the filter assembly 14 and the first guide rail 1213 are directly used together, and no additional guide rail structure is set on the filter assembly 14, the structure of the filter assembly 14 is relatively simple and the cost is low.

[0084] In other embodiments, the housing 11 has a second guide rail (not shown) on its bottom wall along the axial direction of the impeller 122, the shape of which is adapted to the filter assembly 14. The second side portion 14b cooperates with the second guide rail and can slide relative to the second guide rail. By setting the second guide rail, the movement of the filter assembly 14 can be guided when inserting or pulling out the filter assembly 14, avoiding unnecessary deflection, tilting or shaking of the filter assembly 14, facilitating the smooth installation and removal of the filter assembly 14, reducing the difficulty of disassembling and installing the filter assembly 14, and facilitating the replacement of the filter assembly 14.

[0085] In addition, since the second side 14b of the filter assembly 14 is directly used in conjunction with the second guide rail, and no additional guide rail structure is set on the filter assembly 14, the structure of the filter assembly 14 is relatively simple and the cost is low.

[0086] In some other embodiments, such as Figure 14 and Figure 15 As shown, at least one arc-shaped guide plate 1214 is provided between the bottom wall of the volute 121 and the outer shell 11. The arc-shaped guide plate 1214 can be formed on the volute 121 or on the bottom wall of the outer shell 11. The arc-shaped guide plate 1214 and the pull-out port 113 are located on the same side of the outer shell 11. The arc-shaped guide plate 1214 extends circumferentially along the filter assembly 14. The first circumferential side 14c and / or the second circumferential side 14d contact the arc-shaped guide plate 1214 and can slide relative to the arc-shaped guide plate 1214.

[0087] Specifically, when an arc-shaped guide plate 1214 is provided between the bottom wall of the volute 121 and the outer shell 11 on the side where the first circumferential side 14c is located, the first circumferential side 14c contacts the arc-shaped guide plate 1214 and can slide relative to the arc-shaped guide plate 1214; while when an arc-shaped guide plate 1214 is provided between the bottom wall of the volute 121 and the outer shell 11 on the side where the second circumferential side 14d is located, the second circumferential side 14d contacts the arc-shaped guide plate 1214 and can slide relative to the arc-shaped guide plate 1214. When an arc-shaped guide plate 1214 is provided between the bottom wall of the volute 121 and the outer shell 11 on the side where the first peripheral side 14c is located, and an arc-shaped guide plate 1214 is provided between the bottom wall of the volute 121 and the outer shell 11 on the side where the second peripheral side 14d is located, the first peripheral side 14c contacts one of the arc-shaped guide plates 1214 and can slide relative to the arc-shaped guide plate 1214, and the second peripheral side 14d contacts the other arc-shaped guide plate 1214 and can slide relative to the arc-shaped guide plate 1214.

[0088] By setting the arc-shaped guide plate 1214, the movement of the filter assembly 14 can be guided when inserting or pulling out the filter assembly 14, avoiding unnecessary deflection, tilting or shaking of the filter assembly 14, making it easier to install and remove the filter assembly 14, reducing the difficulty of installing and removing the filter assembly 14, and making it easier to replace the filter assembly 14.

[0089] In other embodiments, the first guide rail 1213 and the second guide rail may coexist, or the first guide rail 1213 and the arc-shaped guide plate 1214 may coexist, or the second guide rail and the arc-shaped guide plate 1214 may coexist, or the first guide rail 1213, the second guide rail and the arc-shaped guide plate 1214 may coexist.

[0090] In some embodiments, the first guide rail 1213 may include two first guide ribs 1213a arranged radially spaced along the filter assembly 14. The first guide ribs 1213a are arc-shaped ribs whose shape is adapted to the shape of the filter assembly 14. The first side portion 14a of the filter assembly 14 is slidably embedded between the two first guide ribs 1213a.

[0091] Understandably, in other embodiments, the first guide rail 1213 may also be an arc-shaped guide groove formed on the volute 121, the shape of which is adapted to the shape of the filter assembly 14, and the first side portion 14a of the filter assembly 14 is slidably embedded in the arc-shaped guide groove.

[0092] In some embodiments, the second guide rail may include two second guide ribs (not shown) arranged radially spaced along the filter assembly 14. The second guide ribs are arc-shaped ribs whose shape is adapted to the shape of the filter assembly 14, and the second side portion 14b of the filter assembly 14 is slidably embedded between the two second guide ribs.

[0093] Understandably, in other embodiments, the second guide rail may also be an arc-shaped guide groove formed on the bottom wall of the housing 11, the shape of which is adapted to the shape of the filter assembly 14, and the second side 14b of the filter assembly 14 is slidably embedded in the arc-shaped guide groove.

[0094] In some embodiments, such as Figure 15 and Figure 16 As shown, a limiting groove 114 is provided on the second side wall 11b of the outer casing 11, or on the volute 121 near the second side wall 11b, and the first end 14e of the filter assembly 14 engages with the limiting groove 114.

[0095] By setting a limiting groove 114 to engage with the first end 14e of the filter assembly 14, the filter assembly 14 can be better prevented from accidentally coming out, so that the filter assembly 14 can be more securely fixed inside the housing 11, avoiding the possibility of pulling out the filter assembly 14 with a small force, thereby reducing the probability of accidentally pulling out the filter assembly 14.

[0096] In addition, since the first end 14e of the filter assembly 14 and the limiting groove 114 are directly engaged and snapped together, without setting an additional snap-fit ​​structure on the filter assembly 14, the structure of the filter assembly 14 is relatively simple and the cost is low.

[0097] In some embodiments, such as Figure 15 , Figure 16 and Figure 17 As shown, a handle 143 is connected to the second end 14f of the filter assembly 14. The handle 143 is located outside the housing 11 so that the operator can pull the filter assembly 14 by holding the handle 143.

[0098] For example, the handle 143 may be a hook structure, a T-shaped structure, etc.

[0099] In some embodiments, a limiting baffle 144 is provided at the second end 14f of the filter assembly 14. The limiting baffle 144 is located outside the housing 11 and is used to abut against the side wall of the housing 11. The limiting baffle 144 is connected to a handle 143, which is located outside the housing 11.

[0100] In the above structural design, on the one hand, during the process of inserting the filter assembly 14 into the housing 11 through the pull-out port 113, when the limiting baffle 144 abuts against the side wall (i.e., the first side wall 11a) of the housing 11, if the filter assembly 14 is not inserted further into the housing 11, the filter assembly 14 cannot be inserted further into the housing 11. This can remind the operator that the filter assembly 14 has been installed in place. At the same time, since the limiting baffle 144 is located within the housing 11, it is visually identifiable whether the limiting baffle 144 is abutting against the side wall of the housing 11, making it easy for the operator to identify whether the installation is in place. On the other hand, the operator can pull the filter assembly 14 by holding the handle 143, which makes it convenient for the operator to pull the filter assembly 14.

[0101] In some embodiments, the handle 143 is connected to the second end 14f of the filter assembly 14 via a snap-fit ​​mechanism. Specifically, the handle 143 is connected to the limiting baffle 144 via a snap-fit ​​mechanism. Using a snap-fit ​​mechanism to fix the handle 143 is a simple and easy-to-implement method; moreover, it allows for a detachable connection of the handle 143, facilitating the provision of different types of handles 143 according to user habits. This adapts to the usage habits of different operators, making it convenient for different operators to pull and replace the filter assembly 14 by gripping the handle 143.

[0102] In some embodiments, the second end 14f of the filter assembly 14 is provided with a first limiting baffle 144a and a second limiting baffle 144b, that is, the limiting baffle 144 includes a first limiting baffle 144a and a second limiting baffle 144b. Both the first limiting baffle 144a and the second limiting baffle 144b are located outside the housing 11, and are arranged opposite to each other. Both the first limiting baffle 144a and the second limiting baffle 144b are used to abut against the side wall of the housing 11, so as to limit the filter assembly 14 during the process of inserting the filter assembly 14 into the housing 11 from the pull-out port 113, thereby reminding the operator that the filter assembly 14 has been installed in place.

[0103] In some embodiments, such as Figure 16 and Figure 17 As shown, the edge of the first limiting baffle 144a is bent away from the outer shell 11 to form a first plate 144a1, and the first plate 144a1 is bent away from the first limiting baffle 144a to form a second plate 144a2. The second limiting baffle 144b is provided with a first slot 144b1.

[0104] The handle component 143 includes a connecting plate 1431 and a handle portion 1432. The connecting plate 1431 has a first edge 1431a and a second edge 1431b. The first edge 1431a is bent toward the outer casing 11 to form a third plate 1431c. The third plate 1431c is bent toward the second limiting baffle 144b to form a fourth plate 1431d. A second slot 1431e is formed between the first edge 1431a, the third plate 1431c, and the fourth plate 1431d. The second plate 144a2 is embedded in the second slot 1431e. The second edge 1431b is disposed opposite to the first edge 1431a. The second edge 1431b is provided with a hook 1431f, which engages with the first slot 144b1. The handle 1432 is disposed on the surface of the connecting plate 1431 opposite to the connecting plate 1431, and the handle 1432 is used for the operator to hold.

[0105] Understandably, common snap-fit ​​methods typically involve the hook 1431f and the first slot 144b1 engaging in a snap-fit ​​manner. However, since the direction of the force that separates the hook 1431f and the first slot 144b1 is the same as the direction of the force that pulls out the filter assembly 14, when the handle 1432 is held and the filter assembly 14 is pulled out, the handle 1432 may separate from the limiting baffle 144, while the filter assembly 14 remains inside the outer casing 11, resulting in the filter assembly 14 failing to be pulled out.

[0106] Therefore, in addition to providing a hook 1431f on the second edge 1431b of the connecting plate 1431 to engage with the first slot 144b1 to achieve the snap-locking method of the handle part 1432, this application also bends the edge of the first limiting baffle 144a away from the outer shell 11 to form a first plate 144a1, the first plate 144a1 bends away from the first limiting baffle 144a to form a second plate 144a2, and bends the first edge 1431a of the connecting plate 1431 towards the outer shell 11 to form a third plate 1431c, the third plate 1431c towards the second limiting baffle 144b. The fourth plate 1431d is formed by bending in a certain direction, so that a second slot 1431e is formed between the first edge 1431a, the third plate 1431c and the fourth plate 1431d. The second plate 144a2 is embedded in the second slot 1431e. When the handle 1432 is held and the filter assembly 14 is pulled out, the second plate 144a2 can abut against the fourth plate 1431d to limit the handle 1432 from disengaging from the limiting baffle 144. This prevents the handle 1432 from separating from the limiting baffle 144 while the filter assembly 14 remains inside the outer casing 11, thereby ensuring that the filter assembly 14 can be pulled out.

[0107] When assembling the handle 143, the second plate 144a2 is usually first embedded in the second slot 1431e, and then the hook 1431f is snapped into the first slot 144b1.

[0108] Due to the presence of the second plate 144a2 and the second slot 1431e, a gap exists between the second edge 1431b and the second limiting baffle 144b. Therefore, in some embodiments, the second limiting baffle 144b has a supporting protrusion 144b2 protruding from the surface of the connecting plate 1431. This supporting protrusion 144b2 is located at the edge of the first slot 144b1. This supporting protrusion 144b2 can support the second edge 1431b of the connecting plate 1431, preventing the second edge 1431b of the connecting plate 1431 from collapsing and causing the hook 1431f to impact the outer casing 11 and become damaged.

[0109] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] Furthermore, the embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the content of this specification should not be construed as a limitation of this application, and the protection scope of this application should be determined by the appended claims.

Claims

1. A ducted air conditioner, characterized in that, The ducted air handling unit includes a fresh air module, which includes: The outer casing has a first air vent. The fan includes: A volute, which is disposed inside the outer shell, has an air inlet and an air outlet; The wind turbine is disposed inside the volute. A ventilation cavity is formed inside the volute. The ventilation cavity has a second air inlet and a third air inlet. Fresh outdoor air enters the room sequentially through the second air inlet, the ventilation cavity, the third air inlet, the air inlet, the impeller, the air outlet, and the first air inlet. A filter assembly is disposed inside the housing, and in the direction of fresh air flow from the third air inlet to the impeller, the filter assembly is located between the third air inlet and the air inlet of the impeller. The outer casing has a pull-out opening on the radial side wall of the wind turbine, and the pull-out opening and the second air outlet are located on the same side of the outer casing. The filter assembly is arc-shaped, with a radius of curvature greater than that of the air inlet. The center of the arc of the filter assembly does not coincide with the center of the air inlet. The filter assembly is movably and detachably installed inside the housing through the pull-out opening, and the filter assembly can block the pull-out opening, with a portion protruding outside the housing.

2. The duct air conditioner according to claim 1, characterized in that, The central angle of the filter assembly is defined as θ, and θ satisfies: 54°≤θ≤88°; The radius of the air inlet of the volute is defined as r, and the minimum distance between the center of the filter assembly and the center of the air inlet along the radial direction of the air inlet is defined as L. The L and the r satisfy: 0 < rL ≤ r / 2.

3. The duct air conditioner according to claim 2, characterized in that, The inner diameter of the filter assembly is defined as R, and R satisfies: 272mm≤R≤731mm.

4. The duct air conditioner according to claim 2, characterized in that, The filter assembly has a leeward side, the sidewall of the housing facing the leeward side is defined as the third sidewall, and the distance between the pull-out opening and the third sidewall is defined as L. A The chord length of the filter assembly is defined as L. R ; Among them, L R >L A 377mm≤L R ≤389mm.

5. The duct air conditioner according to claim 1, characterized in that, The first air vent and / or the air outlet are openable and closable, and the third air vent is openable and closable. The outer shell is also provided with an openable and closable fourth air vent, and the ventilation cavity is also provided with an openable and closable fifth air vent. When the fresh air module is in fresh air mode, the first air vent and / or the air outlet are in the open state, and the third air vent is in the open state, while the fourth air vent and the fifth air vent are in the closed state. Outdoor fresh air enters the room sequentially through the second air vent, the ventilation cavity, the third air vent, the filter assembly, the air inlet, the impeller, the air outlet, and the first air vent. When the fresh air module is in exhaust mode, the first air vent and / or the air outlet is closed, the third air vent is closed, and the fourth and fifth air vents are open. The indoor air is discharged to the outside through the fourth air vent, the air inlet, the impeller, the air outlet, the fifth air vent, the ventilation cavity, and the second air vent in sequence.

6. The duct air conditioner according to claim 1, characterized in that, The filter assembly has a first side and a second side that are axially opposed to each other along the impeller, and the filter assembly has a first circumferential side and a second circumferential side that are radially opposed to each other. The volute is provided with a first guide rail whose shape is adapted to the filter assembly. The first side portion cooperates with the first guide rail and can slide relative to the first guide rail. And / or, The outer casing is provided with a second guide rail whose shape is adapted to the filter assembly on the bottom wall along the axial direction of the impeller. The second side portion cooperates with the second guide rail and can slide relative to the second guide rail. And / or, At least one arc-shaped guide plate is provided between the bottom wall of the volute and the outer shell. The arc-shaped guide plate and the pull-out opening are located on the same side of the outer shell. The arc-shaped guide plate extends circumferentially along the filter assembly. The first circumferential side and / or the second circumferential side contact the arc-shaped guide plate and can slide relative to the arc-shaped guide plate.

7. The duct air conditioner according to claim 1, characterized in that, The outer casing has opposing first and second sidewalls, the pull-out opening is formed on the first sidewall, and a limiting groove is provided on the second sidewall or the volute near the second sidewall. The filter assembly has a first end and a second end opposite to each other in its circumferential direction, the first end engaging with the limiting groove, and the second end blocking the pull-out opening.

8. The duct air conditioner according to claim 1, characterized in that, The filter assembly has a first end and a second end opposite each other in its circumferential direction, the second end blocking the pull-out opening; Wherein, a limiting baffle is provided at the second end, the limiting baffle is located outside the outer shell, and the limiting baffle is used to abut against the side wall of the outer shell; The limiting baffle is connected to a handle, which is located outside the housing.

9. The duct air conditioner according to claim 1, characterized in that, The filter assembly has a first end and a second end opposite each other in its circumferential direction. The second end blocks the pull-out opening and is connected to a handle. The handle is located outside the housing and is connected to the second end by a snap-fit.

10. The duct air conditioner according to claim 8, characterized in that, The second end is provided with: A first limiting baffle, located outside the housing, abuts against the side wall of the housing. The edge of the first limiting baffle is bent away from the housing to form a first plate, and the first plate is bent away from the first limiting baffle to form a second plate; and... The second limiting baffle is disposed opposite to the first limiting baffle and located outside the outer shell, and the second limiting baffle is provided with a first slot; The handle component includes: Connecting plate, the connecting plate having: A first edge is formed by bending the first edge toward the outer shell to form a third plate, and the third plate is formed by bending the third plate toward the second limiting baffle to form a fourth plate. A second slot is formed between the first edge, the third plate, and the fourth plate, and the second plate is embedded in the second slot. The second edge is disposed opposite to the first edge, and the second edge is provided with a hook that engages with the first slot. A handle portion is disposed on the surface of the connecting plate opposite to the connecting plate.

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