Air duct assembly for fresh air machine and fresh air machine

Abstract

The application relates to the technical field of fresh air equipment, and discloses an air duct assembly for a fresh air machine, which optimizes the shape of a communication position between an air duct and a heat exchange cavity, so as to reduce the energy consumption and airflow noise of the fresh air machine during work, and to meet the pursuit of high quietness quality by a user. Meanwhile, the application further discloses a fresh air machine.

Description

Technical Field

[0001] This application relates to the field of fresh air equipment technology, such as a duct assembly for a fresh air unit and a fresh air unit. Background Technology

[0002] As a key device for indoor-outdoor air exchange, the core function of a fresh air system is to recover energy through heat exchange elements while introducing fresh outdoor air, thereby maintaining fresh indoor air and reducing energy consumption for heating or cooling. The air duct, acting as the breathing system of the fresh air system, directly determines the core performance indicators of the entire unit, such as airflow, noise, and energy consumption. With users' increasing demands for indoor air quality and quiet operation, designing air duct structures with lower wind resistance, better airflow organization, and lower noise within limited spaces has become a crucial direction for the industry to enhance the competitiveness of fresh air system products.

[0003] In related technologies, in order to optimize the performance of air ducts and meet the production requirements of lightweight and integrated manufacturing, using EPP (expanded polypropylene) foam material to manufacture the air duct body by compression molding has become a mainstream solution.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art: In related technologies, the air ducts made of EPP foam often have a relatively simple internal structure. This means that the fan needs to exert more power to achieve the rated air volume when the whole machine is working, resulting in increased energy consumption and particularly significant airflow noise, making it difficult to meet users' pursuit of high quietness.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a duct assembly and a fresh air unit for a fresh air system. By systematically optimizing the shape of the connection between the duct and the heat exchange chamber, the energy consumption and airflow noise of the fresh air unit during operation are reduced to meet users' pursuit of high quietness.

[0008] This disclosure provides a duct assembly for a fresh air unit, the fresh air unit including a total heat exchange module. The duct assembly includes a duct body. The duct body internally comprises a heat exchange chamber, a fresh air duct, and a return air duct. The total heat exchange module is installed inside the heat exchange chamber, and the fresh air duct and the return air duct are respectively connected to the heat exchange chamber. A first flared opening facing the heat exchange chamber is provided at the connection between the heat exchange chamber and the fresh air duct, and a second flared opening facing the heat exchange chamber is provided at the connection between the heat exchange chamber and the return air duct. The first and second flared openings are respectively provided with a first drain outlet and a second drain outlet.

[0009] In some embodiments, a first drain outlet is disposed at the bottom of a first flared opening; a second drain outlet is disposed at the bottom of a second flared opening.

[0010] In some embodiments, the first horn opening is inclined upward along the direction from the fresh air duct to the heat exchange chamber; the second horn opening is inclined upward along the direction from the return air duct to the heat exchange chamber.

[0011] In some embodiments, the tilt angle of the first flared opening is greater than or equal to 40° and less than or equal to 60°; the tilt angle of the second flared opening is greater than or equal to 40° and less than or equal to 60°.

[0012] In some embodiments, the width of the first flare is greater than or equal to 140 mm and less than or equal to 460 mm; the width of the second flare is greater than or equal to 140 mm and less than or equal to 460 mm.

[0013] In some embodiments, the air duct body is further provided with multiple air vents, which are respectively connected to the fresh air duct and the return air duct, and an arc-shaped air guiding structure is provided at the air vents.

[0014] In some embodiments, the arc angle of the air guide structure is greater than or equal to 120° and less than or equal to 160°.

[0015] In some embodiments, a fresh air volute is provided in the fresh air duct, the diameter of which is greater than or equal to 320 mm and less than or equal to 400 mm; a return air volute is provided in the return air duct, the diameter of which is greater than or equal to 320 mm and less than or equal to 400 mm.

[0016] In some embodiments, the air duct assembly includes: a first air duct component and a second air duct component. The first air duct component has a insertion groove on its side wall facing the air duct; the second air duct component has an insertion protrusion on its wall corresponding to the first air duct component; wherein the insertion protrusion is used to insert into the insertion groove to install the second air duct component onto the first air duct component, and the first air duct component and the second air duct component together constitute the air duct component body.

[0017] This disclosure also provides a fresh air unit comprising: the aforementioned air duct assembly and total heat exchange module. The total heat exchange module is installed within the heat exchange chamber of the air duct assembly and is used for heat exchange between the fresh air duct and the return air duct.

[0018] The air duct assembly and fresh air unit provided in this disclosure can achieve the following technical effects: This disclosure provides a duct assembly for a fresh air system, the fresh air system including a total heat exchange module. The duct assembly includes a duct body. The duct body internally comprises a heat exchange chamber, a fresh air duct, and a return air duct. The total heat exchange module is installed within the heat exchange chamber, and the fresh air duct and return air duct are respectively connected to the heat exchange chamber. A first flared opening facing the heat exchange chamber is provided at the connection between the heat exchange chamber and the fresh air duct, and a second flared opening facing the heat exchange chamber is provided at the connection between the heat exchange chamber and the return air duct. The first and second flared openings are respectively provided with a first drain outlet and a second drain outlet. Thus, when the fresh air system is running, outdoor air flows through the fresh air duct into the heat exchange chamber and exchanges heat with the total heat exchange module, at which time the first flared opening guides the airflow. Simultaneously, indoor air flows through the return air duct into the heat exchange chamber and exchanges heat with the total heat exchange module, at which time the second flared opening guides the airflow. Meanwhile, the placement of drain outlets at the first and second flared ends prevents condensate from accumulating inside, ensuring stable airflow within the fresh and return air ducts. This design, through systematic optimization of the shape at the connection between the duct and the heat exchange chamber, reduces energy consumption and airflow noise during fresh air unit operation, thus meeting users' demands for high-quiet operation.

[0019] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of the structure of an air duct assembly provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of another air duct component provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of another air duct component provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of the structure of a first air duct component provided in an embodiment of this disclosure; Figure 5This is a schematic diagram of the structure of a second air duct component provided in an embodiment of this disclosure.

[0021] Figure label: 10: Air duct body; 11: First air duct component; 111: Insertion slot; 12: Second air duct component; 121: Insertion protrusion; 13: Air outlet; 131: Air guiding structure; 14: Heat exchange chamber; 21: Fresh air duct; 22: First flare; 23: Fresh air volute; 24: First drain outlet; 31: Return air duct; 32: Second bell mouth; 33: Return air volute; 34: Second drain outlet. Detailed Implementation

[0022] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0023] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0024] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0025] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0026] Unless otherwise stated, the term "multiple" means two or more.

[0027] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0028] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0030] like Figures 1 to 5 As shown, this disclosure provides a duct assembly and a fresh air unit for a fresh air system. By systematically optimizing the shape of the connection between the duct and the heat exchange chamber 14, the energy consumption and airflow noise of the fresh air unit during operation are reduced to meet the user's pursuit of high quietness.

[0031] like Figures 1 to 5 As shown, this disclosure provides a duct assembly for a fresh air unit, which includes a total heat exchange module. The duct assembly includes a duct body 10. The duct body 10 has an internal structure of a heat exchange chamber 14, a fresh air duct 21, and a return air duct 31. The total heat exchange module is installed in the heat exchange chamber 14, and the fresh air duct 21 and the return air duct 31 are respectively connected to the heat exchange chamber 14. A first flared opening 22 facing the heat exchange chamber 14 is provided at the connection between the heat exchange chamber 14 and the fresh air duct 21, and a second flared opening 32 facing the heat exchange chamber 14 is provided at the connection between the heat exchange chamber 14 and the return air duct 31. The first flared opening 22 and the second flared opening 32 are respectively provided with a first drain outlet 24 and a second drain outlet 34.

[0032] Specifically, the total heat exchange module is fixedly installed inside the heat exchange chamber 14, while the fresh air duct 21 and the return air duct 31 are respectively connected to the heat exchange chamber 14 to ensure that airflow can pass through the heat exchange area. At the connection point between the heat exchange chamber 14 and the fresh air duct 21, a first flared opening 22 extending towards the interior of the heat exchange chamber 14 is provided, i.e., the first flared opening 22 is gradually narrowed along the airflow direction. Similarly, at the connection point between the heat exchange chamber 14 and the return air duct 31, a second flared opening 32 extending towards the interior of the heat exchange chamber 14 is also provided, i.e., the second flared opening 32 is gradually narrowed along the airflow direction. The first flared opening 22 and the second flared opening 32 are used to optimize airflow guidance, reduce turbulence and pressure loss when air enters and exits the heat exchange chamber 14, thereby improving heat exchange efficiency and overall duct performance. In addition, a first drain outlet 24 is integrated on the first flared port 22, and a second drain outlet 34 is integrated on the second flared port 32. The first drain outlet 24 and the second drain outlet 34 are used to drain condensate or other liquids that may be generated during the air handling process, so as to avoid moisture accumulation affecting the normal operation of the equipment or causing damage to the components, thereby enhancing the reliability and durability of the air duct assembly in a humid environment.

[0033] Understandably, the existing EPP duct has a simple internal structure, leading to severe airflow separation, significant flow losses, and substantial noise. The first flared opening 22 is located at the connection between the heat exchange chamber 14 and the fresh air duct 21, and the second flared opening 32 is located at the connection between the heat exchange chamber 14 and the return air duct 31. These two flared opening structures form a tapered flow channel cross-section, which guides and pre-diffuses the airflow entering the heat exchange chamber 14, while also collecting and confining the airflow exiting the heat exchange chamber 14. This design significantly reduces eddies and flow separation caused by abrupt changes in the flow cross-section when the airflow enters and exits the heat exchange chamber 14, thereby effectively reducing local resistance losses within the duct. Reduced flow resistance means that, while achieving the same rated airflow, the fan load can be reduced, thus achieving the technical effect of reducing overall energy consumption. Simultaneously, the guiding effect of the flared openings helps to ensure that the airflow passes more evenly across the core surface of the total heat exchange module. This avoids concentrated airflow impacting localized areas of the core, ensuring full utilization of the effective area of ​​the heat exchange core. Improved uniformity of airflow distribution directly promotes more thorough heat and humidity exchange between fresh and return air in the heat exchange module, thereby improving the heat exchange efficiency of the total heat exchange module and enhancing the energy recovery performance of the entire unit.

[0034] like Figures 4 to 5 As shown, in some embodiments, the first drain outlet 24 is disposed at the bottom of the first flared outlet 22; the second drain outlet 34 is disposed at the bottom of the second flared outlet 32.

[0035] Specifically, during the operation of the fresh air unit, both condensate from the air and condensate generated during heat exchange naturally accumulate at the bottom of the duct under gravity. The drain outlet at the bottom efficiently "captures" and guides the accumulated water out. This prevents condensate from stagnating or forming irregular flows in other parts of the duct (such as the sidewalls or top), thus solving the water accumulation problem. Simultaneously, placing the first drain outlet 24 and the second drain outlet 34 at the bottom of the first flared opening 22 and the second flared opening 32 respectively minimizes the possibility of water meandering and accumulating inside the duct before discharge, making the drainage process smoother and more efficient. This arrangement, by timely and accurately draining condensate from the bottom, ensures that the flared opening area and even the entire duct interior remain dry. This effectively prevents water accumulation areas from becoming breeding grounds for bacteria, mold, and other microorganisms, helping to maintain the hygienic quality of the supplied air. At the same time, the dry duct wall also maintains its inherent low flow resistance characteristics, preventing changes in airflow or additional flow resistance due to water film adhesion.

[0036] like Figures 1 to 5 As shown, in some embodiments, the first horn opening 22 is inclined upward along the direction from the fresh air duct 21 to the heat exchange chamber 14; the second horn opening 32 is inclined upward along the direction from the return air duct 31 to the heat exchange chamber 14.

[0037] Specifically, when condensation forms on the sloping surface of the funnel opening, especially at its top and sidewalls, gravity causes it to flow downwards naturally. This ensures that the condensate is efficiently collected and guided to the drain outlet, greatly enhancing the initiative and reliability of the entire drainage system. Simultaneously, when airflow exits from the heat exchange chamber 14 with its large cross-sectional area and enters the funnel opening, the cross-sectional area of ​​the flow channel decreases. According to the principle of fluid continuity, the airflow velocity will increase significantly. This acceleration process effectively converts the static pressure of the air into dynamic pressure, giving the airflow higher kinetic energy. This helps overcome the flow resistance of the subsequent duct system, ensuring that the airflow can be effectively drawn into the fan, thereby improving the overall ventilation efficiency and effective air volume of the unit.

[0038] like Figures 1 to 4 As shown, in some embodiments, the tilt angle of the first horn 22 is greater than or equal to 40° and less than or equal to 60°; the tilt angle of the second horn 32 is greater than or equal to 40° and less than or equal to 60°.

[0039] Specifically, if the tilt angle of the first flared opening 22 and the second flared opening 32 is less than 40°, it means that the flow channel transition is too gentle. Although the flow loss may be smaller, it will cause the flared opening structure to extend too far in space. If the tilt angle is greater than 60°, the flow channel cross-section will contract too quickly, and the airflow will easily separate from the wall, generating significant vortices and turbulence. This will not only increase aerodynamic energy loss but also generate greater airflow noise. Therefore, making the tilt angle of the first flared opening 22 and the second flared opening 32 greater than or equal to 40° and less than or equal to 60° can achieve a relatively smooth and orderly acceleration of the airflow within a limited space, suppressing airflow separation to the maximum extent, ensuring efficient kinetic energy transfer, and controlling airflow noise at a low level. At the same time, the tilt angle of 40° to 60° provides a slope with sufficient gravitational force for the condensate, ensuring that the water droplets can continuously and stably overcome the gas phase shear force, form a wall-attached flow, and quickly converge to the drain outlet, thus ensuring the effectiveness of the drainage function under high wind speeds.

[0040] In the above embodiments, the tilt angle of the first horn 22 can be set according to the user's actual needs. For example, the tilt angle of the first horn 22 can be 40°, 50°, or 60°. Similarly, the tilt angle of the second horn 32 can be set according to the user's actual needs. For example, the tilt angle of the second horn 32 can be 40°, 50°, or 60°.

[0041] In some embodiments, the width of the first flared opening 22 is greater than or equal to 140 mm and less than or equal to 460 mm; the width of the second flared opening 32 is greater than or equal to 140 mm and less than or equal to 460 mm.

[0042] Specifically, if the width of the first horn 22 and the second horn 32 is less than 140mm, the outlet cross-section will be too small at a given tilt angle, leading to excessive airflow acceleration. This may cause the following problems: First, excessively high airflow velocity leads to a significant increase in flow resistance, requiring the fan to consume more energy to overcome this local resistance; second, high-speed airflow is prone to whistling, increasing noise; and third, it may adversely affect the aerodynamic performance matching of subsequent fans. If the width is greater than 460mm, it is difficult to form an effective tapering acceleration effect at a reasonable tilt angle, resulting in insufficient airflow acceleration and limited kinetic energy gain, which is not conducive to overcoming subsequent duct resistance. Furthermore, an excessively large width will encroach on the installation space of other components, hindering the miniaturization design of the entire unit. Therefore, ensuring that the width of the first horn 22 and the second horn 32 is greater than or equal to 140mm and less than or equal to 460mm ensures that the airflow can be smoothly and controllably accelerated to an ideal speed range, providing sufficient kinetic energy while minimizing flow losses and aerodynamic noise.

[0043] In the above embodiments, the width of the first horn opening 22 can be set according to the user's actual needs. For example, the width of the first horn opening 22 can be 140mm, 200mm, 300mm, 400mm, or 460mm. Similarly, the width of the second horn opening 32 can be set according to the user's actual needs. For example, the width of the second horn opening 32 can be 140mm, 200mm, 300mm, 400mm, or 460mm.

[0044] like Figure 3 As shown, in some embodiments, the air duct body 10 is also provided with a plurality of air vents 13, which are respectively connected to the fresh air duct 21 and the return air duct 31, and an arc-shaped air guiding structure 131 is provided at the air vent 13.

[0045] Specifically, when airflow passes through the inlet / outlet 13, if the edge of the inlet 13 is a right angle or an acute angle, it will cause the streamline to bend sharply, generating significant vortices and flow separation zones, forming local resistance. The arc-shaped air guide structure 131 provides a smooth, continuous transition surface, guiding the airflow to change direction smoothly along the arc. This greatly eliminates vortices caused by abrupt changes in flow direction, allowing the airflow to flow into or out of the duct more smoothly, thereby effectively reducing energy loss at the inlet and outlet. At the same time, airflow passing through sharp edges or impacting right-angle structures is one of the main sources of aerodynamic noise. The arc-shaped air guide structure eliminates these sharp edges that generate howling and turbulent noise. The smooth arc surface allows the airflow to pass smoothly, fundamentally weakening the intensity of the noise source. Furthermore, the structure itself also helps to disperse and attenuate some of the generated vortex noise, achieving comprehensive noise reduction from the source to the path, significantly improving the perceived quietness for the user.

[0046] like Figure 3 As shown, in some embodiments, the arc angle of the air guide structure 131 is greater than or equal to 120° and less than or equal to 160°.

[0047] Specifically, while a curvature angle of less than 120° provides a very smooth flow, the structure becomes very flat and extends excessively into the duct. Conversely, a curvature angle greater than 160° results in an overly abrupt transition, significantly reducing its guiding effect and failing to effectively eliminate airflow separation, still generating significant vortices and drag. Therefore, a curvature angle greater than or equal to 120° and less than or equal to 160° provides a sufficiently smooth and effective guide, significantly improving the flow field while avoiding excessive structural expansion and reducing the installation space occupied by the duct components.

[0048] In the above embodiments, the arc angle of the air guide structure 131 can be set according to the actual needs of the user. For example, the arc angle of the air guide structure 131 can be 120°, 130°, 140°, 150° or 160°.

[0049] like Figures 1 to 5 As shown, in some embodiments, a fresh air volute 23 is provided in the fresh air duct 21, the diameter of the fresh air volute 23 is greater than or equal to 320 mm and less than or equal to 400 mm; a return air volute 33 is provided in the return air duct 31, the diameter of the return air volute 33 is greater than or equal to 320 mm and less than or equal to 400 mm.

[0050] Specifically, if the diameters of the fresh air volute 23 and the return air volute 33 are less than 320mm, the internal flow channels of the volutes will be too narrow, severely compressing the airflow diffusion space and causing increased friction between the airflow and the volute wall, while also resulting in insufficient dynamic pressure recovery at the outlet. This will significantly increase the fan's load and power consumption, leading to a decrease in airflow at the same power and a reduction in the overall energy efficiency ratio. If the diameters of the fresh air volute 23 and the return air volute 33 are greater than 400mm, although the flow resistance will be lower, it will lead to an unnecessary increase in the equipment size. At the same time, an excessively large volute will cause the airflow velocity to be too low, affecting the effective conversion of dynamic pressure. Therefore, making the diameters of the fresh air volute 23 and the return air volute 33 greater than or equal to 320mm and less than or equal to 400mm provides an ideal diffusion and guiding space for the airflow after it leaves the impeller, ensuring that static pressure can be efficiently recovered and converted into effective air supply power, thereby allowing the fan to operate in its optimal efficiency range and achieving a balance between high airflow and low energy consumption.

[0051] In the above embodiments, the diameter of the fresh air volute 23 can be set according to the user's actual needs. For example, the diameter of the fresh air volute 23 can be 320mm, 340mm, 360mm, 380mm, or 400mm. Similarly, the diameter of the return air volute 33 can be set according to the user's actual needs. For example, the diameter of the return air volute 33 can be 320mm, 340mm, 360mm, 380mm, or 400mm.

[0052] like Figures 1 to 5 As shown, in some embodiments, the air duct assembly includes a first air duct component 11 and a second air duct component 12. The first air duct component 11 has a insertion groove 111 on its side wall facing the air duct; the second air duct component 12 has an insertion protrusion 121 corresponding to the wall surface of the first air duct component 11; wherein, the insertion protrusion 121 is used to insert into the insertion groove 111 to install the second air duct component 12 onto the first air duct component 11, and the first air duct component 11 and the second air duct component 12 together constitute the air duct component body 10.

[0053] Specifically, a portion of the fresh air duct 21, the return air duct 31, and the heat exchange chamber 14 are disposed in the first air duct component 11, and another portion is disposed in the second air duct component 12. This allows the fresh air duct 21, the return air duct 31, and the heat exchange chamber 14 to be constructed within the air duct component body 10 after the first air duct component 11 and the second air duct component 12 are assembled. In this way, by decomposing the complex air duct component body 10 into the first air duct component 11 and the second air duct component 12, and using the mating method of the insertion slot 111 and the insertion protrusion 121, modularization of the air duct is achieved. On the production line, these two components can be molded separately, reducing the complexity and cost of individual molds and increasing production cycle time. On the installation site, users can quickly and accurately align and insert the two components, avoiding the cumbersome positioning and sealing process, greatly simplifying the assembly process and reducing installation time and the probability of errors. At the same time, the split insertion structure also provides convenience for later maintenance. If cleaning the inside of the air duct or servicing the heat exchange core is required, the air duct assembly can be disassembled relatively easily, avoiding the difficulty of accessing the internal components found in traditional one-piece structures. This maintainable design extends the product's effective lifespan and reduces long-term operating costs for users.

[0054] Understandably, for air ducts with complex internal shapes such as volutes and flared openings, one-piece molds are often structurally complex, costly, and difficult to demold. By adopting a split design, these complex internal features can be arranged on two separate air duct components. For example, part of the volute can be designed in the first air duct component 11, and another part in the second air duct component 12; when combined, they form a complete flow channel. This significantly reduces the manufacturing difficulty of the mold and improves the molding quality of the parts.

[0055] like Figures 1 to 5 As shown in the figure, this disclosure also provides a fresh air unit including: the above-described air duct assembly and total heat exchange module. The total heat exchange module is installed in the heat exchange chamber 14 of the air duct assembly and is used to exchange heat between the fresh air duct 21 and the return air duct 31.

[0056] Specifically, the total heat exchange module can be installed in the heat exchange chamber 14 using fasteners or clips, allowing the airflow in the fresh air duct 21 and return air duct 31 to exchange heat through the total heat exchange module. When the fresh air unit using the duct assembly provided in this application is running, outdoor air flows through the fresh air duct 21 into the heat exchange chamber 14 and exchanges heat with the total heat exchange module. At this time, the first flare 22 guides the airflow. Simultaneously, indoor air flows through the return air duct 31 into the heat exchange chamber 14 and exchanges heat with the total heat exchange module. At this time, the second flare 32 guides the airflow. Furthermore, the presence of drain outlets in the first and second flare 22 prevents condensate from accumulating inside the flare ducts, ensuring the stability of airflow within the fresh air duct 21 and return air duct 31. This configuration, through systematic optimization of the shape at the connection between the duct and the heat exchange chamber 14, reduces energy consumption and airflow noise during fresh air unit operation, meeting users' demands for high quietness.

[0057] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A duct assembly for a fresh air system, characterized in that, The fresh air system includes a total heat exchange module; The air duct assembly includes: The air duct body (10) has an internal structure including a heat exchange chamber (14), a fresh air duct (21) and a return air duct (31). The total heat exchange module is installed in the heat exchange chamber (14), and the fresh air duct (21) and the return air duct (31) are respectively connected to the heat exchange chamber (14). The heat exchange chamber (14) is provided with a first horn-shaped opening (22) facing the heat exchange chamber (14) at the connection between the heat exchange chamber (14) and the fresh air duct (21), and a second horn-shaped opening (32) facing the heat exchange chamber (14) at the connection between the heat exchange chamber (14) and the return air duct (31). The first horn-shaped opening (22) and the second horn-shaped opening (32) are respectively provided with a first drain outlet (24) and a second drain outlet (34).

2. The air duct assembly according to claim 1, characterized in that, The first drain outlet (24) is located at the bottom of the first flared opening (22); and, The second drain outlet (34) is located at the bottom of the second flared opening (32).

3. The air duct assembly according to claim 1, characterized in that, The first horn opening (22) is inclined upward along the direction from the fresh air duct (21) to the heat exchange chamber (14); and, The second horn (32) is inclined upward along the direction from the return air duct (31) to the heat exchange chamber (14).

4. The air duct assembly according to claim 3, characterized in that, The tilt angle of the first flared opening (22) is greater than or equal to 40°, and less than or equal to 60°; and, The tilt angle of the second horn (32) is greater than or equal to 40° and less than or equal to 60°.

5. The air duct assembly according to claim 1, characterized in that, The width of the first flared opening (22) is greater than or equal to 140 mm, and less than or equal to 460 mm; and, The width of the second horn opening (32) is greater than or equal to 140 mm and less than or equal to 460 mm.

6. The air duct assembly according to claim 1, characterized in that, The air duct body (10) is also provided with multiple air vents (13), which are respectively connected to the fresh air duct (21) and the return air duct (31), and an arc-shaped air guiding structure (131) is provided at each air vent (13).

7. The air duct assembly according to claim 6, characterized in that, The arc angle of the air guide structure (131) is greater than or equal to 120° and less than or equal to 160°.

8. The air duct assembly according to claim 1, characterized in that, A fresh air volute (23) is provided inside the fresh air duct (21). The diameter of the fresh air volute (23) is greater than or equal to 320 mm, and less than or equal to 400 mm. The return air duct (31) is provided with a return air volute (33), the diameter of which is greater than or equal to 320 mm and less than or equal to 400 mm.

9. The air duct assembly according to any one of claims 1 to 8, characterized in that, include: The first air duct component (11) has a plug groove (111) on the side wall facing the air duct; and, The second air duct component (12) has a plug-in protrusion (121) on its wall surface corresponding to the first air duct component (11); The insertion protrusion (121) is used to insert into the insertion slot (111) to install the second air duct component (12) onto the first air duct component (11). The first air duct component (11) and the second air duct component (12) together form the air duct component body.

10. A fresh air ventilator, characterized in that, include: Duct assembly for a fresh air unit as described in any one of claims 1 to 9; and, The total heat exchange module is installed in the heat exchange chamber (14) of the air duct assembly and is used to exchange heat between the fresh air duct (21) and the return air duct (31).

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