Ducted fan

Abstract

The application discloses a ducted air conditioner, and a fresh air module of the ducted air conditioner comprises a shell, a fan, a ventilation cavity and a filter screen assembly. The fan comprises a volute arranged in the shell and a fan wheel arranged in the volute. The volute is communicated with a room through a first air port and has an air inlet. The ventilation cavity is formed in the volute and is communicated with the outside through a second air port. A cavity wall of the ventilation cavity is provided with a third air port. The filter screen assembly is arranged in the shell and located between the third air port and the air inlet. The first air port and the third air port are openable and closable. The shell is provided with an openable and closable fourth air port and a sixth air port. The cavity wall of the ventilation cavity is provided with an openable and closable fifth air port. When the fresh air module is in a mixed air mode, the first air port, the third air port and the sixth air port are in an open state, and the fourth air port and the fifth air port are in a closed state. Outdoor fresh air enters the room through the second air port, the ventilation cavity, the third air port, the filter screen assembly, the fan and the first air port. Indoor air enters the room through the sixth air port, the filter screen assembly, the fan and the first air port.

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] As air conditioner performance is gradually optimized, many existing ducted air conditioners are usually equipped with a fresh air module to introduce fresh outdoor air into the indoor environment, thereby supplementing the indoor air volume and improving indoor air quality.

[0003] In related technologies, common fresh air modules have two main functions: First, they simply blow fresh air, introducing outdoor fresh air through ducts into the module, purifying it through internal filters, and then blowing it into the room to replenish the indoor air volume. Second, in addition to blowing fresh air, they can also exhaust air. If the indoor air is polluted, indoor air can be drawn into the fresh air module and exhausted through ducts to improve the indoor air quality.

[0004] However, if the outdoor air temperature is relatively low or high, the indoor temperature may drop rapidly to a relatively low temperature or rise rapidly to a relatively high temperature after the outdoor air enters the room. This can cause users to feel too cold or too hot in the indoor environment, affecting their comfort. Utility Model Content

[0005] This application discloses a ducted air conditioner that can ensure the temperature of the air delivered to the room by the fresh air module is close to the current indoor air temperature when there is a difference between indoor and outdoor air temperatures, thereby avoiding discomfort caused by temperature differences and improving user comfort.

[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: shell; The fan includes: A volute, wherein the volute is disposed within the outer casing and is connected to the interior through a first air vent, and the volute has an air inlet; The wind turbine is disposed inside the volute. A ventilation cavity is formed inside the volute and is connected to the outside through a second air vent. A third air vent is provided on the cavity wall of the ventilation cavity. A filter assembly is disposed within the housing, and in the direction of fresh air flow from the third air inlet to the air inlet, the filter assembly is located between the third air inlet and the air inlet; The first air vent and the third air vent are openable and closable, the outer shell has a fourth air vent that is openable and closable, and the cavity wall of the ventilation cavity has a fifth air vent that is openable and closable. When the fresh air module is in fresh air mode, the first air vent and the third air vent are in the open state, and the fourth air vent and the fifth air vent are in the closed state. Outdoor fresh air enters the room in sequence through the second air vent, the ventilation cavity, the third air vent, the filter assembly, the air inlet, the impeller, and the first air vent. When the fresh air module is in exhaust mode, the first air vent and the third air vent are closed, and the fourth air vent and the fifth air vent are open. The indoor air is discharged to the outside through the fourth air vent, the air inlet, the impeller, the fifth air vent, the ventilation cavity and the second air vent in sequence. The outer casing is also provided with an openable and closable sixth air vent, which is located on the windward side of the filter assembly. When the fresh air module is in internal circulation mode, the first air vent and the sixth air vent are in the open state, and the third air vent, the fourth air vent and the fifth air vent are in the closed state. The indoor air enters the room sequentially through the sixth air vent, the filter assembly, the air inlet, the impeller and the first air vent. When the fresh air module is in mixed air mode, the first air vent, the third air vent, and the sixth air vent are in the open state, and 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, and the first air vent. Indoor air enters the room sequentially through the sixth air vent, the filter assembly, the air inlet, the impeller, and the first air vent.

[0007] In the ducted air conditioner provided in this application embodiment, its fresh air module switches between fresh air mode, exhaust mode, internal circulation mode and mixed air mode by opening and closing the first air outlet, the third air outlet, the fourth air outlet, the fifth air outlet and the sixth air outlet. It only requires a ventilation cavity, a fan and a filter assembly to form a set of air duct system, which can send outdoor air to the room after being filtered by the filter assembly, can also exhaust indoor air to the outside in a timely manner, can also send indoor air back to the room after being filtered by the filter assembly, and can also mix outdoor air and indoor air, filter it and send it to the room. The structure is simple, the cost is reduced, the volume is reduced, the space occupied by the fresh air module is reduced, and it is easy to install and arrange.

[0008] Due to the existence of internal circulation and mixed air modes, when there is a temperature difference between indoor and outdoor air, the fresh air module can activate the internal circulation mode. This allows indoor air at a more comfortable temperature to be purified by the filter assembly before being blown into the room. This ensures that the temperature of the incoming air is closer to the indoor air temperature, providing a more comfortable experience and avoiding discomfort caused by temperature differences. This improves user comfort and eliminates the need for separate cooling or heating, saving energy. Alternatively, the fresh air module can activate the mixed air mode, mixing outdoor fresh air with indoor air. This mixture is then filtered by the filter assembly before being delivered indoors. This purifies the indoor air, improving air quality by increasing oxygen levels and decreasing carbon dioxide levels, thus enhancing indoor comfort. Simultaneously, it can regulate the temperature of the outdoor fresh air, reducing the temperature difference between the incoming fresh air and the indoor air, thereby avoiding discomfort caused by temperature differences and improving user comfort. This also eliminates the need for separate cooling or heating, saving energy. 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 ductwork machine disclosed in the embodiments of this application; Figure 2 This is a front view of the ductwork unit disclosed in the embodiments of this application; Figure 3 The ductwork machine when the first and second air vents disclosed in the embodiments of this application are in the open state. Figure 2 A cross-sectional view along the AA direction; Figure 4 The ductwork machine is in the closed state when the first and second air vents disclosed in the embodiments of this application are in the closed state. Figure 2 A cross-sectional view along the AA direction; Figure 5 The ductwork machine disclosed in the embodiments of this application is... Figure 2 A cross-sectional view along the BB direction in the middle; Figure 6 This is an exploded structural diagram of the first type of duct air conditioner disclosed in the embodiments of this application; Figure 7 This is an exploded structural diagram of the second type of duct air conditioner disclosed in the embodiments of this application; Figure 8 This is an exploded view of the third type of duct air conditioner disclosed in the embodiments of this application; Figure 9This is an exploded structural diagram of the fourth type of ducted air conditioner disclosed in the embodiments of this application; Figure 10 This is a bottom view of the duct air conditioner disclosed in the embodiments of this application; Figure 11 The ductwork machine disclosed in the embodiments of this application is... Figure 10 The first sectional view along the CC direction in the diagram; Figure 12 The ductwork machine disclosed in the embodiments of this application is... Figure 10 The second sectional view in the CC direction; Figure 13 yes Figure 12 A three-dimensional image; Figure 14 This is a schematic diagram of the structure of the outer shell, damper, guide rail, drive motor and transmission components when the damper is in the first position as disclosed in the embodiments of this application; Figure 15 This is a schematic diagram of the structure of the outer shell, damper, guide rail, drive motor and transmission components when the damper is in the second position, as disclosed in the embodiments of this application; Figure 16 The ductwork machine disclosed in the embodiments of this application is... Figure 14 The first sectional view along the DD direction in the middle; Figure 17 The ductwork machine disclosed in the embodiments of this application is... Figure 14 The second sectional view in the DD direction; Figure 18 This is an exploded structural diagram of the outer shell, damper, guide rail, drive motor and transmission components when the damper is in the first position as disclosed in the embodiments of this application; Figure 19 yes Figure 18 A structural diagram from another perspective; Figure 20 This is a schematic diagram of the first structure of the damper disclosed in the embodiments of this application; Figure 21 This is a schematic diagram of the first structure of the housing, guide rail and drive motor disclosed in the embodiments of this application; Figure 22 This is a schematic diagram of the second structure of the damper disclosed in the embodiments of this application; Figure 23 This is a schematic diagram of a second structure of the housing, guide rail, and drive motor disclosed in an embodiment of this application; Figure 24 This is a schematic diagram of the transmission component disclosed in the embodiments of this application.

[0011] Explanation of main figure symbols 100 - Fresh air module; 10 - Housing; 101 - First air outlet; 102 - Second air outlet; 103 - Pull-out port; 104 - Fourth air outlet; 105 - Sixth air outlet; 106 - Motor mounting base; 11 - Fan; 111 - Volute; 1111 - Air inlet; 112 - Impeller; 12 - Ventilation cavity; 121 - Third air outlet; 122 - Fifth air outlet; 13 - Filter assembly; 14 - Duct connector; 15 - Sealing component; 16 - Air damper; 161 - Slide groove; 162 - First extension; 1621 - First protrusion; 163 - Second extension; 1631 - Avoidance notch; 164 - Guide groove; 165 - Stepped portion; 17 - Guide rail; 171 - First part; 1711 - Second protrusion; 172 - Second part; 18 - Drive motor; 181 - Output shaft; 1811 - First anti-rotation surface; 19 - Transmission component; 19a - First plate; 19a1 - First end; 19a2 - Second end; 19b - Second plate; 19c - Third plate; 191 - Slider; 192 - Shaft hole; 1921 - Second anti-rotation surface; 193 - Flanged structure; 20 - First limiting component; 21 - Second limiting component; f1 - thickness direction; f2 - length direction; f3 - width direction. 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] Ductless air conditioners are short for central air conditioning duct-type indoor units. They are a type of concealed air conditioning indoor unit that solves the problem of exposed wall-mounted and floor-standing units affecting aesthetics. At the same time, the duct length is longer than that of ordinary household air conditioners, making installation more flexible. It is a new type of air conditioner.

[0021] To improve indoor air quality, ducted air conditioners are usually equipped with a fresh air module to introduce fresh outdoor air into the indoor environment, supplementing the indoor air supply. At the same time, to meet users' requirements for the quality of the incoming fresh air, the fresh air module is generally equipped with a filter to filter the incoming fresh air. During use, the filter needs to be replaced regularly to ensure its filtration effect.

[0022] Current fresh air modules generally only have the function of blowing fresh air into the room; or, in addition to the function of blowing fresh air into the room, they also have the function of exhausting the indoor polluted air for exhaust treatment.

[0023] In other words, common fresh air modules fall into two categories: First, they only have a fresh air function, simply introducing outdoor fresh air through ducts into the module, purifying it through the module's filters, and then blowing it into the user's room. Second, they have both fresh air and exhaust functions. If the user needs additional fresh air, outdoor fresh air can be drawn into the module through ducts, purified through the module's filters, and then blown into the user's room. During this process, no air is exhausted to the outside. If the indoor air is polluted, indoor air can be drawn into the module and exhausted through ducts to improve the indoor air quality. During this process, no fresh air is blown into the room.

[0024] However, if the outdoor air temperature is relatively low or high, the indoor temperature will also be relatively low or high after the outdoor air enters the user's room, making the user feel very cold or very hot, resulting in a poor user experience.

[0025] In view of this, the present application provides a fresh air module for a ducted air conditioner, which, when there is a difference between indoor and outdoor air temperatures, ensures that the air temperature delivered by the fresh air module to the room is close to the current indoor air temperature, thereby avoiding discomfort caused by temperature differences and improving user comfort.

[0026] 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 unit of a wall-mounted air conditioner or a floor-standing air conditioner).

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Please see Figure 1 and Figure 2 The fresh air module 100 provided in this application embodiment includes a housing 10, which serves as an external protective component of the fresh air module 100. Its internal space can be used to accommodate various functional devices of the fresh air module 100, such as the fan 11 and filter assembly 13 mentioned later, etc.

[0036] In some embodiments, such as Figure 2 and Figure 3 As shown, the fresh air module 100 provided in this application embodiment includes a fan 11 and a ventilation cavity 12.

[0037] In this application, the fan 11 may include a volute 111 and a fan wheel 112. The volute 111 is disposed inside the outer casing 10 and communicates with the indoor environment through a first air inlet 101. The volute 111 has an air inlet 1111 and the fan wheel 112 is disposed inside the volute 111.

[0038] In this application, a ventilation cavity 12 is formed within a volute 111, and the ventilation cavity 12 is connected to the outside through a second air inlet 102. The cavity wall of the ventilation cavity 12 has a third air inlet 121 that communicates with an air inlet 1111. Thus, when the impeller 112 is running, fresh air from the outside can enter the room sequentially through the second air inlet 102, the ventilation cavity 12, the third air inlet 121, the air inlet 1111, the impeller 112, and the first air inlet 101 to keep the indoor air fresh.

[0039] In some embodiments, such as Figures 3 to 5 As shown, the fresh air module 100 provided in this embodiment includes a filter assembly 13, which is disposed inside the housing 10. In the direction of fresh air flow from the third air inlet 121 to the air inlet 1111, the filter assembly 13 is located between the third air inlet 121 and the air inlet 1111. Thus, when the impeller 112 is operating, outdoor fresh air can sequentially enter the room through the second air inlet 102, the ventilation cavity 12, the third air inlet 121, the filter assembly 13, the air inlet 1111, the impeller 112, and the first air inlet 101 to maintain fresh indoor air.

[0040] The filter assembly 13 is designed to filter fresh air before it passes through the impeller 112, thus 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 112 and affecting its operation, thereby helping to ensure the normal operation of the impeller 112.

[0041] In some embodiments, such as Figure 6 As shown, a pull-out opening 103 is provided on the side wall of the outer casing 10. The filter assembly 13 can be movably and detachably installed inside the outer casing 10 through the pull-out opening 103, and the filter assembly 13 can block the pull-out opening 103, with a portion protruding outside the outer casing 10. Therefore, when it is necessary to disassemble or install the filter assembly 13, the portion of the filter assembly 13 exposed outside the outer casing 10 can be pulled out to complete the quick disassembly or installation of the filter assembly 13. That is, the operator can perform the disassembly or installation of the filter assembly 13 outside the fresh air module 100 without first removing the inspection cover. The operation is very simple and convenient, greatly simplifying the disassembly or installation process of the filter assembly 13, enabling quick replacement of the filter assembly 13, improving the convenience of filter replacement, and saving time and effort.

[0042] The filter assembly 13 is partially exposed outside the outer casing 10. This can be understood as follows: the filter assembly 13 protrudes from the pull-out opening 103 and is located outside the outer casing 10. The part of the filter assembly 13 located outside the outer casing 10 can serve as a grip, making it easy to hold and pull out the filter assembly 13. Alternatively, it can be understood as follows: the filter assembly 13 does not protrude from the pull-out opening 103 and is located outside the outer casing 10. The filter assembly 13 is not blocked by the outer casing 10 through the pull-out opening 103. In this case, the surface of the filter assembly 13 exposed through the pull-out opening 103 can be provided with a groove, so as to hold the groove wall and pull out the filter assembly 13.

[0043] Understandably, in other embodiments, the shell wall of the outer casing 10 may not have a pull-out opening 103, and the filter assembly 13 may be completely hidden inside the outer casing 10.

[0044] In some embodiments, combined with Figures 4 to 6 As shown, the first air vent 101 and the third air vent 121 are openable and closable. The outer casing 10 is also provided with an openable and closable fourth air vent 104, and the cavity wall of the ventilation cavity 12 is also provided with an openable and closable fifth air vent 122.

[0045] When the fresh air module 100 is in fresh air mode, the first air vent 101 and the third air vent 121 are in the open state, and the fourth air vent 104 and the fifth air vent 122 are in the closed state. The fresh air from outside enters the room in sequence through the second air vent 102, the ventilation cavity 12, the third air vent 121, the filter assembly 13, the air inlet 1111, the impeller 112 and the first air vent 101.

[0046] When the fresh air module 100 is in exhaust mode, the first air vent 101 and the third air vent 121 are closed, and the fourth air vent 104 and the fifth air vent 122 are open. The indoor air is exhausted to the outside through the fourth air vent 104, the air inlet 1111, the impeller 112, the fifth air vent 122, the ventilation cavity 12, and the second air vent 102 in sequence.

[0047] In other words, when fresh air needs to be introduced, the impeller 112 is activated. At this time, the first air vent 101 and the third air vent 121 are open, while the fourth air vent 104 and the fifth air vent 122 are closed. Fresh outdoor air enters the room sequentially through the second air vent 102, the ventilation cavity 12, the third air vent 121, the filter assembly 13, the air inlet 1111, the impeller 112, and the first air vent 101 to improve indoor air quality and enhance user comfort. When exhaust air needs to be introduced, the impeller 112 is activated. At this time, the first air vent 101 and the third air vent 121 are closed, while the fourth air vent 104 and the fifth air vent 122 are open. Indoor air is exhausted to the outside sequentially through the fourth air vent 104, the air inlet 1111, the impeller 112, the fifth air vent 122, the ventilation cavity 12, and the second air vent 102 to improve indoor air quality, effectively reduce the concentration of harmful gases indoors, and enhance user comfort.

[0048] By opening and closing the first air vent 101, the third air vent 121, the fourth air vent 104, and the fifth air vent 122, the fresh air module 100 can switch between the fresh air intake mode and the exhaust air mode. Only one ventilation cavity 12 and one fan 11 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.

[0049] Optionally, the first air vent 101 and the second air vent 102 may be located on adjacent sidewalls of the outer casing 10, the third air vent 121 may be formed on the surface of the volute 111 facing the bottom wall of the outer casing 10, and the fourth air vent 104 and the sixth air vent 105 may both be formed on the bottom wall of the outer casing 10, and the fourth air vent 104 and the first air vent 101 and the second air vent 102 are located on different sides of the outer casing.

[0050] Since both the fourth air vent 104 and the sixth air vent 105 are used to allow indoor air to enter the outer casing 10, the fourth air vent 104 and the sixth air vent 105 are centrally located on the same shell wall of the outer casing 10, which facilitates a centralized and orderly layout of the return air duct. The centralized and orderly duct layout can reduce unnecessary sharp bends and duct length, which helps to reduce the resistance of the entire return air system, making the fan work more efficiently, and the energy consumption and noise may be lower. At the same time, there will be no problem of air intake on one side and air exhaust on the other side, which could lead to air pressure differences causing short circuits in the exhaust or return air.

[0051] In some embodiments, the housing 10 is further provided with an openable and closable sixth air vent 105, which is located on the windward side of the filter assembly 13.

[0052] When the fresh air module 100 is in internal circulation mode, the first air vent 101 and the sixth air vent 105 are open, while the third air vent 121, the fourth air vent 104 and the fifth air vent 122 are closed. Indoor air enters the room sequentially through the sixth air vent 105, the filter assembly 13, the air inlet 1111, the impeller 112 and the first air vent 101.

[0053] When the fresh air module 100 is in mixed air mode, the first air vent 101, the third air vent 121 and the sixth air vent 105 are in the open state, and the fourth air vent 104 and the fifth air vent 122 are in the closed state. The outdoor fresh air enters the room in sequence through the second air vent 102, the ventilation cavity 12, the third air vent 121, the filter assembly 13, the air inlet 1111, the impeller 112 and the first air vent 101. The indoor air enters the room in sequence through the sixth air vent 105, the filter assembly 13, the air inlet 1111, the impeller 112 and the first air vent 101.

[0054] With this configuration, the opening and closing of the first air vent 101, the third air vent 121, the fourth air vent 104, the fifth air vent 122, and the sixth air vent 105 enable the fresh air module 100 to switch between fresh air mode, exhaust air mode, internal circulation mode, and mixed air mode. A single air duct system consisting of a ventilation chamber 12, a fan 11, and a filter assembly 13 can deliver outdoor air to the room after filtration by the filter assembly 13, promptly exhaust indoor air to the outside, and also deliver indoor air back to the room after filtration by the filter assembly 13. Simultaneously, it can mix outdoor and indoor air, filter it, and then deliver it to the room. The structure is simple, reducing costs and size, minimizing the space occupied by the fresh air module 100, and facilitating installation and layout.

[0055] Due to the existence of internal circulation mode and mixed air mode, when there is a difference in indoor and outdoor air temperature, the fresh air module 100 can activate the internal circulation mode. This allows indoor air with a more comfortable temperature to be purified by the filter assembly 13 before being blown into the room. This ensures that the temperature of the incoming air is closer to the indoor air temperature, providing a more comfortable experience and avoiding discomfort caused by temperature differences. This improves user comfort and eliminates the need for separate cooling or heating, saving energy. Alternatively, the fresh air module 100 can activate the mixed air mode, mixing outdoor fresh air with indoor air. This mixture is then filtered by the filter assembly 13 before being delivered indoors. This purifies the indoor air, improving air quality by increasing oxygen levels and decreasing carbon dioxide levels, thus enhancing indoor comfort. Simultaneously, it regulates the temperature of the outdoor fresh air, reducing the temperature difference between the incoming fresh air and the indoor air, further preventing discomfort caused by temperature differences and improving user comfort. This also eliminates the need for separate cooling or heating, saving energy.

[0056] For example, when there is a significant difference between indoor and outdoor air temperatures, i.e., when the outdoor air temperature is relatively low or high, the fresh air module 100 can activate the internal circulation mode. It purifies the indoor air at a more comfortable temperature through the filter component 13 before blowing it into the room. This ensures that the temperature of the air entering the room is closer to the indoor air temperature, which is more suitable. This avoids the discomfort caused by temperature differences and improves user comfort. It also eliminates the need for separate cooling or heating to prevent the indoor air temperature from being too low or too high, thus saving energy and electricity.

[0057] When the temperature difference between indoor and outdoor air is not significant—for example, when the indoor air temperature is slightly higher and the outdoor air temperature is slightly cooler—the fresh air module 100 activates the mixing mode, blending the cool outdoor air with the slightly warmer indoor air. This fresh air is then filtered by the filter assembly 13 and delivered indoors. The combined effect of these two elements allows the indoor air to regulate the temperature of the outdoor air, raising the temperature of the incoming indoor air to be closer to the current indoor temperature. This avoids discomfort caused by temperature differences, improves user comfort, eliminates the need for separate heating, and reduces the temperature difference between the incoming and indoor air, saving energy. Simultaneously, it purifies the indoor air, improving air quality by increasing oxygen levels and decreasing carbon dioxide levels, thus enhancing indoor comfort.

[0058] For example, when the indoor air temperature is slightly cooler and the outdoor air temperature is slightly higher, the fresh air module 100 activates the mixed air mode, mixing the slightly warmer outdoor air with the cool indoor air. After being filtered by the filter assembly 13, the mixture is delivered indoors. This combined effect allows the indoor air to regulate the temperature of the outdoor air, lowering the temperature of the incoming indoor air so that it is close to the current indoor temperature. This avoids discomfort caused by temperature differences, improves user comfort, eliminates the need for separate cooling, and reduces the temperature difference between the incoming and indoor air, saving energy. At the same time, it also purifies the indoor air, improving indoor air quality by increasing oxygen levels and decreasing carbon dioxide levels, thus enhancing indoor comfort.

[0059] In some embodiments, such as Figures 3 to 6As shown, 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 also includes a duct connector 14 mounted on the outer casing 10. This duct connector 14 is connected to the ventilation cavity 12 via a second air outlet 102. In other words, an external fresh air duct (not shown) can be installed on the duct connector 14 to connect the fresh air duct to the ventilation cavity 12. Extending the length of the ventilation cavity 12 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 12 with the outdoor environment.

[0060] In some embodiments, the second air vent 102 can be opened and closed. When the fresh air module 100 is in fresh air mode and mixed air mode, the second air vent 102 is in an open state, and when the fresh air module 100 is in exhaust mode and internal circulation mode, the second air vent 102 is in a closed state.

[0061] By making the second vent 102 also openable and closable, the second vent 102 can be opened only when air needs to enter or exit, and closed at other times. This selective opening and closing of the second vent 102 can reduce the possibility of outdoor debris entering the ventilation cavity 12 through the second vent 102 and causing blockage of the ventilation cavity 12, especially in severe weather, such as typhoon days or windy days, when outdoor debris is more likely to enter the ventilation cavity 12 through the second vent 102. In such weather conditions, closing the second vent 102 can prevent outdoor debris from entering the ventilation cavity 12 and avoid blockage of the ventilation cavity 12.

[0062] In some embodiments, rotatable sealing members 15 may be provided at the first air vent 101, the second air vent 102, the third air vent 121, the fourth air vent 104, and the fifth air vent 122, respectively, so that the opening and closing of the first air vent 101, the second air vent 102, the third air vent 121, the fourth air vent 104, and the fifth air vent 122 can be controlled by rotating the sealing members 15.

[0063] In some embodiments, such as Figure 6 and Figure 7 As shown, the pull-out opening 103 can be formed on the side wall of the housing 10, and the pull-out opening 103 can be located on the same side of the housing 10 as the second air inlet 102, allowing the filter assembly 13 to be pulled out laterally. In this exemplary embodiment, the filter assembly 13 can be an arc-shaped structure, and the radius of curvature of the filter assembly 13 is smaller than the radius of curvature of the air inlet 1111, and the center of the arc of the filter assembly 13 does not coincide with the center of the circle of the air inlet 1111; or, the filter assembly 13 can also be a straight plate structure.

[0064] In other embodiments, such as Figure 8 and Figure 9As shown, a pull-out opening 103 can be formed on the bottom wall of the housing 10, allowing the filter assembly 13 to be pulled out vertically. In this exemplary embodiment, the pull-out opening 103 can be an arc-shaped opening extending circumferentially along the impeller 112, and the shape of the filter assembly 13 can be an arc shape adapted to the shape of the pull-out opening 103; or, the pull-out opening 103 can be a square opening, and when the filter assembly 13 is inserted into the housing 10 from the pull-out opening 103, the filter assembly 13 and the bottom wall of the housing 10 can be vertically arranged, or the filter assembly 13 can be inclined relative to the bottom wall of the housing 10.

[0065] The bottom wall of the outer casing 10 refers to the casing wall of the outer casing 10 facing the ground when the fresh air module 100 is installed on the indoor ceiling.

[0066] In some embodiments, such as Figure 10 and Figure 11 As shown, the fresh air module 100 also includes a damper 16, which is used to open or close the sixth air outlet 105.

[0067] In some embodiments, such as Figure 11 As shown, the damper 16 is rotatably disposed inside the housing 10 and can be switched between a first position and a second position; wherein, when the damper 16 is rotated to the first position, the damper 16 opens the sixth air vent 105, and when the damper 16 is rotated to the second position, the damper 16 closes the sixth air vent 105.

[0068] In the above structural design, the damper 16 is installed inside the housing 10 by rotation. A small rotary motor with a small footprint can be used to drive the damper 16 to rotate, reducing the space occupied inside the housing 10 and facilitating the layout of the internal structural components. There is no need to set up an additional transmission mechanism to convert the rotational motion of the rotary motor into linear motion. The overall structure for realizing the rotation of the damper 16 is relatively simple, which can further reduce the space occupied inside the housing 10 and make it easier to arrange the internal structural components. At the same time, it can also reduce costs.

[0069] In other embodiments, such as Figure 12 and Figure 13 As shown, the damper 16 is slidably disposed inside the housing 10, and can be in a first position (e.g. Figure 14 (as shown) and the second position (as shown) Figure 15 Switching between (as shown); wherein, when the damper 16 slides to the first position, the damper 16 opens the sixth air vent 105, and when the damper 16 slides to the second position, the damper 16 closes the sixth air vent 105.

[0070] Understandably, if the damper 16 is cantilevered after opening the sixth air vent 105, then the damper 16 requires a certain structural strength, meaning it cannot undergo significant deformation and close the sixth air vent 105 again after opening. However, by sliding the damper 16 inside the housing 10, when the sixth air vent 105 is opened, the damper 16 is still supported by the housing wall (such as the bottom wall of the housing 10) where the sixth air vent 105 is located, just as when it is closed, rather than being cantilevered. Therefore, it is not necessary to use a damper 16 with extremely high structural strength, thus reducing the requirements for the damper 16 and helping to save costs.

[0071] In this application, as Figure 13 , Figure 14 and Figure 15 As shown, the damper 16 has a thickness direction f1, a length direction f2 and a width direction f3, wherein the thickness direction f1 extends along the wall thickness direction of the outer shell, and the width direction f3 extends along the sliding direction of the damper 16.

[0072] In some embodiments, the damper 16 has a groove 161 on its thickness direction f1 facing away from the sixth air outlet 105, and the groove 161 extends along the length direction f2 of the damper 16; the fresh air module 100 also includes a guide rail 17, a drive motor 18 and a transmission member 19, the guide rail 17 and the sixth air outlet 105 are formed on the same shell wall of the housing 10, the guide rail 17 extends along the width direction f3 of the damper 16 and is slidably connected to the damper 16; the drive motor 18 and the sixth air outlet 105 are disposed on the same shell wall of the housing 10, the drive motor 18 is located inside the housing 10 and is located on one side of the damper 16 in its length direction f2; one end of the transmission member 19 is connected to the output shaft 181 of the drive motor 18, and the other end of the transmission member 19 is provided with a slider 191, which is slidably disposed in the groove 161. When the drive motor 18 drives the transmission component 19 to swing, the slider 191 slides relative to the slide groove 161, and pushes the damper 16 to slide along the guide rail 17, so as to realize the damper 16 in the first position (e.g. Figure 14 (as shown) and the second position (as shown) Figure 15 Switching between (as shown).

[0073] That is, while the output shaft 181 of the drive motor 18 is rotating, it will drive the transmission component 19 to swing around the output shaft 181. As the transmission component 19 swings, the slider 191 slides relative to the slide groove 161 and pushes the damper 16 to slide along the guide rail 17, so as to realize the switching of the damper 16 between the first position and the second position.

[0074] In the above structural design, the rotational motion of the drive motor 18 can be converted into the sliding linear motion of the damper 16 to realize the sliding design of the damper 16. At the same time, the damper 16 can always be constrained and guided by the guide rail 17 during the sliding process, which can make the damper 16 slide more smoothly, improve the stability of the damper 16 sliding, and ensure that the damper 16 can open and close the sixth air outlet 105 smoothly.

[0075] Understandably, in addition to utilizing the cooperation between the guide rail 17, drive motor 18 and transmission component 19 to achieve the sliding design of the damper 16, the damper 16 can also be driven by a cylinder, hydraulic cylinder or other drive mechanism to make linear motion, so as to achieve the sliding design of the damper 16.

[0076] In some embodiments, the drive motor 18 may be a stepper motor. In other embodiments, the drive motor 18 may also be a servo motor.

[0077] Optionally, a motor mounting base 106 is provided on the shell wall of the housing 10, and the drive motor 18 can be fixed to the motor mounting base 106 by screws.

[0078] In some embodiments, combined with Figures 14 to 17 As shown, the damper 16 has two edges bent towards the sixth air outlet 105 along its length direction f2 to form a first extension 162. The first extension 162 is bent to form a second extension 163, which extends along the length direction f2 and the width direction f3 of the damper 16. There are two guide rails 17, which are arranged along the length direction f2 on two opposite sides of the sixth air outlet 105. Each guide rail 17 includes a first part 171 and a second part 172. The first part 171 is formed on the shell wall of the outer shell 10 and extends along the thickness direction f1 and the width direction f3 of the damper 16. The second part 172 is connected to the first part 171 at an angle and extends along the length direction f2 and the width direction f3 of the damper 16. That is, the first part 171 and the second part 172 are roughly L-shaped.

[0079] The first extension 162 and the second part 172 abut against each other in the length direction f2 of the damper 16, the second extension 163 and the first part 171 abut against each other in the length direction f2 of the damper 16, and the second extension 163 and the second part 172 abut against each other in the thickness direction f1 of the damper 16.

[0080] In the above structural design, on the one hand, during the sliding of the damper 16, the mutual abutment of the first extension 162 and the second part 172 in the length direction f2 of the damper 16, and the mutual abutment of the second extension 163 and the first part 171 in the length direction f2 of the damper 16, restricts and guides the damper 16 to slide along its width direction f3, thereby achieving a guiding effect on the damper 16 during sliding, so that the damper 16 can slide more smoothly, improve the stability of the damper 16 sliding, and ensure that the damper 16 can open and close the sixth air outlet 105 smoothly; on the other hand, when the sixth air outlet 105 is set upward, the mutual abutment of the second part 172 and the second extension 163 in the thickness direction f1 of the damper 16 can be used to prevent the damper 16 from falling under the action of gravity, and to prevent the entire damper 16 from relying on the transmission member 19 for support, which would lead to deformation or even breakage of the transmission member 19.

[0081] Understandably, in other embodiments, the surface of the damper 16 facing the sixth air outlet 105 may be provided with a guide groove 164, and the guide rail 17 may be a guide protrusion protruding on the shell wall of the outer shell 10. The guide protrusion is slidably disposed in the guide groove 164 to achieve the guiding effect on the damper 16 when it slides.

[0082] An example, such as Figure 16 As shown, the first extension 162 bends towards the center away from the damper 16 to form the second extension 163. At this time, it is equivalent to the two first extensions 162 being located between the two second parts 172, and the two second extensions 163 being located between the two first parts 171.

[0083] Another example, such as Figure 17 As shown, the first extension 162 bends toward the middle of the damper 16 to form a second extension 163, so that a guide groove 164 is formed between the second extension 163, the first extension 162 and the damper 16, and the second part 172 is slidably disposed in the guide groove 164.

[0084] With this configuration, the two first parts 171 are located between the two second extensions 163, and the two second parts 172 are located between the two first extensions 162. When the damper 16 slides to the first position to close the sixth air vent 105, it can better and more effectively seal the sixth air vent 105. The damper 16 has better sealing performance for the sixth air vent 105, thereby effectively preventing air leakage when the sixth air vent 105 is blocked by the damper 16.

[0085] In some embodiments, such as Figure 18 and Figure 19As shown, the output shaft 181 of the drive motor 18 is provided with a first anti-rotation surface 1811, and the transmission member 19 is provided with a shaft hole 192 that mates with the output shaft 181. The hole wall of the shaft hole 192 forms a second anti-rotation surface 1921. The output shaft 181 passes through the shaft hole 192, and the first anti-rotation surface 1811 and the second anti-rotation surface 1921 are fitted together, thereby enabling the output shaft 181 to drive the transmission member 19 to swing.

[0086] In some embodiments, the slider 191 may be a cylindrical structure, which can reduce the contact area between the outer peripheral surface of the slider 191 and the groove wall surface of the groove 161, thereby reducing the friction between them.

[0087] In some embodiments, such as Figure 19 and Figure 20 As shown, in the width direction f3 of the damper 16, the size of the second extension 163 is smaller than the size of the damper 16, so that the second extension 163 has an avoidance notch 1631 on the side in the width direction f3 of the damper 16.

[0088] In the above design, since the second extension 163 has an avoidance notch 1631 in the width direction f3 of the damper 16, when assembling the damper 16, one side of the damper 16 in the width direction f3 can rest on the guide rail 17, and then the damper 16 is pushed along its width direction f3 to insert the second part 172 of the guide rail 17 into the guide groove 164, thereby completing the installation of the damper 16. Since in the initial installation position, one side of the damper 16 in the width direction f3 can be directly attached to the guide rail 17, compared to the initial installation position where one side of the damper 16 in the width direction f3 cannot be attached to the guide rail 17, but is arranged side by side with the guide rail 17 along the width direction f3 of the damper 16, this application can make the size of the damper 16 in the width direction f3 as large as possible, increase the size of the sixth air outlet 105 in the width direction f3 of the damper 16, and increase the air intake of the sixth air outlet 105.

[0089] Furthermore, such as Figure 21As shown, in the width direction f3 of the damper 16, the size of the first part 171 is larger than the size of the second part 172, so that the side of the first part 171 in the width direction f3 of the damper 16 forms a second protrusion 1711 that protrudes from the second part 172. Thus, when assembling the damper 16, one side of the damper 16 in the width direction f3 can rest on the second protrusion 1711, and then the damper 16 is pushed along its width direction f3 to insert the second part 172 of the guide rail 17 into the guide groove 164, thereby completing the installation of the damper 16. Simultaneously, since the size of the first part 171 in the width direction f3 of the damper 16 is larger than the size of the second part 172, it is equivalent to the second part 172 having a section missing on the side where the second protrusion 1711 is located. This facilitates identification and differentiation of the two sides of the guide rail 17 in the width direction f3 of the damper 16, serving as a reminder for the initial installation of the damper 16.

[0090] Furthermore, such as Figure 20 As shown, in the width direction f3 of the damper 16, the dimensions of the first extension 162 and the second extension 163 can be equal, that is, in the width direction f3 of the damper 16, the dimension of the second extension 163 is smaller than the dimension of the damper 16.

[0091] In some embodiments, such as Figure 22 and Figure 23 As shown, in the width direction f3 of the damper 16, the dimensions of the first portion 171 and the second portion 172 are equal; and in the width direction f3 of the damper 16, the dimensions of the first extension 162 and the damper 16 are the same, that is, in the width direction f3 of the damper 16, the dimension of the first extension 162 is larger than the dimension of the second extension 163, so that the side of the first extension 162 in the width direction f3 of the damper 16 forms a first protrusion 1621 protruding from the second extension 163.

[0092] With this configuration, during the assembly of the damper 16, when the damper 16 is placed on the second protrusion 1711 of the first part 171, the two first protrusions 1621 and the two second parts 172 can cooperate to precisely place one side of the damper 16 on the second protrusion 1711 of the first part 171 in its width direction f3. At the same time, when the damper 16 is pushed along its width direction f3 during the assembly process, the first protrusion 1621 can slide along the width direction f3 of the damper 16 against the second part 172. During this process, the second part 172 will constrain the sliding path of the damper 16, ensuring that the guide groove 164 can be aligned with the second part 172 so that the second part 172 can be inserted into the guide groove 164 along the width direction f3 of the damper 16, thus completing the installation of the damper 16.

[0093] To prevent excessive movement of the damper 16, in some embodiments, such as Figure 23 and Figure 24 As shown, the fresh air module 100 also includes a first limiting member 20, which is disposed on one side of the transmission member 19 in its swing direction. When the damper 16 is in the first position, the transmission member 19 abuts against the first limiting member 20. By having the first limiting member 20 abut against the transmission member 19 to restrict the sliding of the damper 16, excessive sliding of the damper 16 when closing the sixth air vent 105 can be avoided, thus ensuring the airtightness of the damper 16 in sealing the sixth air vent 105.

[0094] Optionally, the shape of the first limiting member 20 may be, but is not limited to, U-shaped, L-shaped, circular or other shapes.

[0095] To prevent excessive movement of the damper 16, in some embodiments, the fresh air module 100 further includes a second limiting member 21. This second limiting member 21 is disposed on the opposite side of the transmission member 19 in its swing direction. When the damper 16 is in the second position, the transmission member 19 abuts against the second limiting member 21. By having the second limiting member 21 abut against the transmission member 19 to restrict the sliding of the damper 16, excessive sliding of the damper 16 when closing the sixth air vent 105 can be prevented, thus ensuring the airtightness of the damper 16 in sealing the sixth air vent 105.

[0096] Optionally, the shape of the second limiting member 21 may be, but is not limited to, U-shaped, L-shaped, circular or other shapes.

[0097] In some embodiments, such as Figure 24 As shown, the transmission component 19 is a long strip-shaped plate structure, which can form a large flat surface on the transmission component 19 for setting the slider 191. This allows for the setting of a large slider 191 on the transmission component 19, ensuring the structural strength of the slider 191.

[0098] In some embodiments, the periphery of the transmission member 19 is bent away from the damper 16 in the thickness direction f1 to form a flange structure 193. The flange structure 193 is provided to increase the structural strength of the transmission member 19.

[0099] In some embodiments, the transmission member 19 includes a first plate 19a, a second plate 19b, and a third plate 19c. The first plate 19a has a first end 19a1 and a second end 19a2 opposite to each other in its length extension direction. A slider 191 is disposed on the surface of the first end 19a1 facing the damper 16. The second plate 19b is angularly connected to the second end 19a2 and extends in a direction away from the damper 16. The third plate 19c is angularly connected to the second plate 19b and extends in a direction away from the first plate 19a to be connected to the output shaft 181 of the drive motor 18.

[0100] In the above-mentioned structural design of the transmission component 19, the shape of the transmission component 19 is roughly Z-shaped. Compared with the straight plate-shaped transmission component 19, it has stronger bending resistance and higher structural strength; at the same time, it can also leave more space for the movement of the damper 16.

[0101] 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.

[0102] 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: shell; The fan includes: A volute, wherein the volute is disposed within the outer casing and is connected to the interior through a first air vent, and the volute has an air inlet; The wind turbine is disposed inside the volute. A ventilation cavity is formed inside the volute and is connected to the outside through a second air vent. A third air vent is provided on the cavity wall of the ventilation cavity. A filter assembly is disposed within the housing, and in the direction of fresh air flow from the third air inlet to the air inlet, the filter assembly is located between the third air inlet and the air inlet; The first air vent and the third air vent are openable and closable, the outer shell has a fourth air vent that is openable and closable, and the cavity wall of the ventilation cavity has a fifth air vent that is openable and closable. When the fresh air module is in fresh air mode, the first air vent and the third air vent are in the open state, and the fourth air vent and the fifth air vent are in the closed state. Outdoor fresh air enters the room in sequence through the second air vent, the ventilation cavity, the third air vent, the filter assembly, the air inlet, the impeller, and the first air vent. When the fresh air module is in exhaust mode, the first air vent and the third air vent are closed, and the fourth air vent and the fifth air vent are open. The indoor air is discharged to the outside through the fourth air vent, the air inlet, the impeller, the fifth air vent, the ventilation cavity and the second air vent in sequence. The outer casing is also provided with an openable and closable sixth air vent, which is located on the windward side of the filter assembly. When the fresh air module is in internal circulation mode, the first air vent and the sixth air vent are in the open state, and the third air vent, the fourth air vent and the fifth air vent are in the closed state. The indoor air enters the room sequentially through the sixth air vent, the filter assembly, the air inlet, the impeller and the first air vent. When the fresh air module is in mixed air mode, the first air vent, the third air vent, and the sixth air vent are in the open state, and 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, and the first air vent. Indoor air enters the room sequentially through the sixth air vent, the filter assembly, the air inlet, the impeller, and the first air vent.

2. The duct air conditioner according to claim 1, characterized in that, The fresh air module also includes an air damper, which is rotatably disposed inside the housing and can be switched between a first position and a second position; Specifically, when the damper is rotated to the first position, the damper opens the sixth air outlet; when the damper is rotated to the second position, the damper closes the sixth air outlet.

3. The duct air conditioner according to claim 1, characterized in that, The fresh air module also includes an air damper, which is slidably disposed inside the housing and can be switched between a first position and a second position; Specifically, when the damper slides to the first position, the damper opens the sixth air outlet; when the damper slides to the second position, the damper closes the sixth air outlet.

4. The duct air conditioner according to claim 3, characterized in that, The damper has a thickness direction, a length direction and a width direction, the thickness direction extends along the wall thickness direction of the outer shell, and the width direction extends along the sliding direction of the damper; The damper has a groove on its surface facing away from the sixth air outlet in the thickness direction, and the groove extends along the length direction. The fresh air module also includes: The guide rail and the sixth air outlet are formed on the same shell wall of the outer shell, the guide rail extends along the width direction and is slidably connected to the air damper; A drive motor is provided, and the drive motor and the sixth air outlet are disposed on the same shell wall of the outer casing. The drive motor is located inside the outer casing and on one side of the damper in the length direction. A transmission component, one end of which is connected to the output shaft of the drive motor, and the other end of which is provided with a slider, which is slidably disposed in the groove; When the drive motor drives the transmission component to swing, the slider slides relative to the slide groove and pushes the damper to slide along the guide rail, so as to realize the switching of the damper between the first position and the second position.

5. The duct air conditioner according to claim 4, characterized in that, The damper bends its two edges in the length direction toward the sixth air outlet to form a first extension, and the first extension bends its side away from the damper to form a second extension, which extends along the length direction and the width direction. There are two guide rails, which are arranged along the length direction on two opposite sides of the sixth air outlet. Each guide rail includes: The first part is formed on the shell wall of the outer shell and extends along the thickness direction and the width direction; The second part is connected to the first part at an angle and extends along the length direction and the width direction; Wherein, the first extension and the second portion abut against each other in the length direction, the second extension and the first portion abut against each other in the length direction, and the second extension and the second extension abut against each other in the thickness direction.

6. The duct air conditioner according to claim 5, characterized in that, The first extension bends toward the middle of the damper to form the second extension, so that a guide groove is formed between the second extension, the first extension and the damper, and the second part is slidably disposed in the guide groove.

7. The duct air conditioner according to claim 6, characterized in that, In the width direction of the damper, the size of the second extension is smaller than the size of the damper, so that the second extension has an avoidance notch on its side in the width direction.

8. The duct air conditioner according to claim 7, characterized in that, In the width direction of the damper, the dimensions of the first portion and the second portion are equal; In the width direction of the damper, the first extension and the second extension are of equal size, such that the first extension has a first protrusion protruding from the second extension on its side in the width direction, and the first protrusion is able to slide along the width direction of the damper against the second extension.

9. The duct air conditioner according to claim 4, characterized in that, The fresh air module also includes: A first limiting member is disposed on one side of the transmission member in its swing direction. When the damper is in the first position, the transmission member abuts against the first limiting member. The second limiting member is disposed on the other side of the transmission member in its swing direction, and when the damper is in the second position, the transmission member abuts against the second limiting member.

10. The duct air conditioner according to any one of claims 1-9, characterized in that, The fourth air vent and the sixth air vent are both formed on the bottom wall of the outer casing, and the fourth air vent, the first air vent, and the second air vent are located on different sides of the outer casing.

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