A new fan

Abstract

The utility model relates to air treatment technical field especially is related to a kind of fresh air machine.The fresh air machine includes: panel assembly, its inside is defined to form the fresh air cavity and return air cavity of interval arrangement;Air duct assembly is connected with panel assembly, and air duct assembly is defined to form the fresh air passage and return air passage of interval arrangement and respectively with fresh air cavity and return air cavity intercommunication in it;Inside fan, it is arranged in fresh air passage, for prompting fresh air flow to flow through fresh air passage and fresh air cavity in turn and discharge;And outside fan, it is arranged in return air passage, for prompting return air flow to flow through return air cavity and return air passage in turn and discharge.The utility model embodiment's fresh air machine by the core components such as air duct assembly and fan are centrally arranged, and only need to define fresh air cavity and return air cavity in panel assembly, while ensuring bidirectional independent ventilation, effectively realize the miniaturization of panel assembly, reduce the occupied space of fresh air machine in indoor, to improve the user's use experience.

Description

Technical Field

[0001] This utility model relates to the field of air treatment technology, and in particular to a new type of air ventilator. Background Technology

[0002] With increasing attention to indoor air quality, fresh air systems are being used more and more widely to improve the indoor air environment. Among them, wall-mounted fresh air systems are favored due to their convenient installation. They mainly achieve air exchange by introducing outdoor fresh air and exhausting indoor return air, and reduce energy loss through heat exchange treatment.

[0003] However, existing wall-mounted fresh air systems have some shortcomings. Some systems concentrate heat exchange components and fans in the indoor casing, resulting in a large indoor unit that occupies space and affects the aesthetics of the interior. Other systems, while optimizing the positions of the fan and heat exchange components, fail to rationally divide the internal space of the indoor panel, easily causing airflow turbulence. Still other systems have inadequately designed air ducts for the heat exchange components, resulting in limited heat exchange area and affecting heat exchange efficiency. Furthermore, many systems require multiple holes to be drilled in the wall during installation, increasing installation difficulty and cost, and potentially damaging the wall structure. Therefore, how to achieve miniaturization of the indoor fresh air system and simplify the installation process while ensuring air exchange and heat exchange effects has become a problem that existing technologies need to solve. Utility Model Content

[0004] In view of the above problems, this utility model proposes a new air ventilator that overcomes or at least partially solves the above problems, and a new air ventilator having the same.

[0005] One objective of this invention is to overcome at least one deficiency of the prior art and provide a new air ventilator with a compact structure and small footprint.

[0006] A further objective of this invention is to achieve orderly airflow within the panel assembly.

[0007] Another further objective of this invention is to improve the energy efficiency of the fresh air system.

[0008] According to a first aspect of this utility model, a fresh air ventilator is provided, comprising:

[0009] A panel assembly that defines an intermittently spaced fresh air cavity and return air cavity;

[0010] The air duct assembly is connected to the panel assembly, and the air duct assembly defines a fresh air channel and a return air channel that are spaced apart and communicate with the fresh air cavity and the return air cavity respectively.

[0011] An internal fan, installed within the fresh air duct, is used to ensure that the fresh air flows sequentially through the fresh air duct and fresh air chamber before being discharged; and

[0012] An external fan is installed in the return air duct to facilitate the return airflow to flow sequentially through the return air chamber and the return air duct before being discharged.

[0013] Furthermore, the panel assembly includes:

[0014] The casing is hollow inside, and has spaced-apart fresh air outlets and return air inlets; and

[0015] A partition is installed inside the housing, and the partition and the housing define a fresh air cavity that communicates with the fresh air outlet and a return air cavity that communicates with the return air inlet.

[0016] Furthermore, the air duct assembly includes:

[0017] The cylindrical body has a fresh air inlet and a return air outlet spaced apart at the end away from the panel assembly;

[0018] A heat exchange component is installed inside the cylinder to perform heat exchange treatment on the airflow entering the cylinder. A fresh air channel and a return air channel are defined between the heat exchange component and the cylinder. The fresh air channel is used to connect the fresh air inlet and the fresh air outlet, and the return air channel is used to connect the return air inlet and the return air outlet.

[0019] Furthermore, multiple fresh air channels and multiple return air channels are defined between the heat exchange components and the cylinder, and the multiple fresh air channels and multiple return air channels are arranged alternately along the circumferential direction of the cylinder.

[0020] Furthermore, the inner cylinder, with its two ends connected to the heat exchange components and the baffle plate respectively, and its hollow interior forming an air inlet cavity for connecting the fresh air duct and the fresh air chamber; and

[0021] The outer cylinder is connected to the cylinder body and the shell at both ends, and is located radially outside the inner cylinder, forming an air outlet cavity at intervals between the inner cylinder and the return air cavity for connecting the return air cavity and the return air duct; wherein

[0022] The internal fan is installed in the air inlet cavity along the axial direction of the cylinder. It is used to guide the fresh air flow from the fresh air inlet into the cylinder and then flow through the fresh air channel, the air inlet cavity and the fresh air cavity in sequence, and then be discharged through the fresh air outlet.

[0023] Furthermore, the air duct assembly also includes:

[0024] The external fan bracket is connected at both ends to the heat exchange components and the cylinder, respectively, and its hollow interior forms an exhaust chamber for connecting the return air duct and the return air outlet;

[0025] The external fan is installed in the exhaust cavity along the axial direction of the cylinder. It is used to guide the fresh air flow from the return air inlet into the shell and then flow through the return air cavity, the exhaust air cavity and the return air channel in sequence, and then be discharged through the return air outlet.

[0026] Furthermore, the casing is a vertically extending rectangular structure, and the fresh air outlet and return air inlet are respectively located on two opposite side walls of the casing.

[0027] Furthermore, the fresh air chamber and the return air chamber are arranged horizontally at intervals within the housing.

[0028] Furthermore, the panel assembly also includes:

[0029] The first air damper, rotatably mounted within the fresh air chamber, is used to open or close the fresh air outlet; and

[0030] The second air damper is rotatably installed inside the return air cavity and is used to open or close the return air inlet.

[0031] Furthermore, the panel assembly also includes:

[0032] A first knob, rotatably mounted on the housing and connected to the first damper via a drive mechanism, is used to drive the first damper to rotate; and

[0033] The second knob is rotatably mounted on the housing and is connected to the second damper drive mechanism to drive the second damper to rotate.

[0034] This novel fresh air system achieves physical isolation and synchronous independent drive of fresh and return air airflows through a fresh air chamber and return air chamber separated within the panel assembly, and independent fresh air and return air channels within the duct assembly, each equipped with an internal and external fan located in a dual-channel configuration. This results in two advantages: firstly, a bidirectional airflow path is formed within a single wall opening, enabling continuous directional air delivery by dual fans without requiring double-hole construction, avoiding airflow interruptions caused by intermittent reversal of the reversible fan, and improving ventilation stability; secondly, the duct assembly and fans, along with other core components, are centrally located for embedding within the wall opening, resulting in a compact structure and avoiding the concentration of components in the indoor panel assembly. This effectively miniaturizes the panel assembly, reduces the space occupied by the fresh air system indoors, and improves the user experience.

[0035] Furthermore, in the fresh air system of this utility model, the housing of the panel assembly cooperates with the partition to clearly separate the fresh air chamber and the return air chamber within the housing. Corresponding fresh air outlets and return air inlets are provided on the housing, allowing fresh air to enter the room through the fresh air outlet after passing through the fresh air chamber during operation, while return air enters the return air chamber through the return air inlet, achieving strict separation of airflow within the panel assembly. Therefore, the fresh air system of this utility model, by setting a partition within the housing, avoids the mixing or turbulence of fresh and return airflow within the panel assembly, ensuring orderly airflow within the panel assembly, thereby improving ventilation efficiency and further enhancing the user experience.

[0036] Furthermore, the fresh air unit of this invention comprises a cylinder with a fresh air inlet and a return air outlet, and a heat exchange component built into the cylinder. The heat exchange component and the cylinder define isolated fresh air and return air channels, allowing both fresh and return air to exchange heat fully with the heat exchange component during operation. Therefore, the fresh air unit of this invention achieves heat exchange between fresh and return air through the heat exchange component within the cylinder. When there is a large temperature difference between indoors and outdoors, the temperature of the fresh air can be adaptively adjusted using the cooling / heating capacity of the return air stored in the heat exchange component, eliminating the need for additional cooling / heating devices and thus improving the energy efficiency of the fresh air unit.

[0037] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0038] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0039] Figure 1 This is a schematic diagram of the structure of a fresh air unit according to an embodiment of the present invention;

[0040] Figure 2 yes Figure 1 The diagram shows the structure of the fresh air unit after being cut open from the side.

[0041] Figure 3 yes Figure 1 The exploded view of the fresh air unit shown;

[0042] Figure 4 yes Figure 3 The diagram shows the structure of the heat exchange component in the fresh air unit after being cut open from the side.

[0043] Figure 5 yes Figure 3 The exploded view of the heat exchange components in the fresh air unit is shown.

[0044] Figure 6 yes Figure 5 A schematic diagram of the structure of the first annular end cap from another perspective;

[0045] Figure 7 yes Figure 5 A schematic diagram of the second annular end cap from another perspective;

[0046] Figure 8 yes Figure 5 The diagram shows the structure of the heat exchange flat tube. Detailed Implementation

[0047] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0048] To solve at least one of the above-mentioned technical problems, this utility model provides a heat exchange component and a fresh air fan having the same. Figure 1 This is a structural schematic diagram of a fresh air unit 1 according to an embodiment of the present invention.

[0049] Figure 2 yes Figure 1 The diagram shows the structure of the fresh air unit 1 after being cut open from the side. Figure 3 yes Figure 1 The exploded view of the fresh air unit 1 is shown. Figure 4 yes Figure 3 The diagram shows the structure of the heat exchange component in the fresh air unit after being laterally cut open. The cut does not pass through the hole axis, and the internal structure of the heat exchange component is shown from the perspective of simultaneously cutting open the first and second channels located on both radial sides of the hole axis. Figure 5 yes Figure 3 The diagram shown is an exploded view of the heat exchange components in the fresh air unit. Figure 6 yes Figure 5 The diagram shows the structure of the first annular end cap from another perspective. Figure 7 yes Figure 5 The diagram shows the structure of the second annular end cap from another perspective. Figure 8 yes Figure 5 The diagram shows the structure of the heat exchange flat tube. The following is a related explanation. Figures 1-8 The structure of the fresh air unit 1 in this embodiment of the present utility model will be described in detail.

[0050] like Figure 1 and Figure 2 As shown, the fresh air unit 1 of this utility model embodiment may include a panel assembly 10, an air duct assembly 20, an internal fan 30, and an external fan 40.

[0051] like Figure 2 As shown, the panel assembly 10 defines a fresh air cavity 11 and a return air cavity 12 that are spaced apart, so as to allow the return airflow in the room to be separated from the fresh airflow within the panel assembly 10 while fresh air is being supplied to the room, so that the fresh airflow and return airflow can flow separately within the panel assembly 10. Specifically, the panel assembly 10 is used to be installed indoors and adjacent to a wall.

[0052] like Figure 1 As shown, the duct assembly 20 is connected to the panel assembly 10. The duct assembly 20 is used to pass through the wall from indoors to outdoors and is at least partially exposed to the outdoor environment. Figure 2 As shown, the air duct assembly 20 defines a fresh air passage 21 and a return air passage 22 that are spaced apart and communicate with the fresh air chamber 11 and the return air chamber 12, respectively. Specifically, the fresh air passage 21 and the return air passage 22 are spaced apart, with the fresh air chamber 11 communicating with the fresh air passage 21 and the return air chamber 12 communicating with the return air passage 22. Thus, the flow channels for fresh air and return air are isolated and independently configured.

[0053] like Figure 2 As shown, the indoor fan 30 is installed in the fresh air duct 21 to facilitate the fresh air flow through the fresh air duct 21 and the fresh air chamber 11 in sequence before being discharged, so as to realize the delivery of fresh air flow to the room.

[0054] like Figure 2 As shown, the outdoor fan 40 is installed in the return air duct 22 to facilitate the return air flow to pass through the return air chamber 12 and the return air duct 22 in sequence before being discharged, so as to realize the delivery of indoor return air flow to the outside.

[0055] The fresh air unit 1 of this utility model realizes physical isolation and synchronous independent driving of fresh air and return air flow by separating the fresh air cavity 11 and return air cavity 12 in the panel assembly 10, and the independent fresh air channel 21 and return air channel 22 in the air duct assembly 20, and configuring the inner fan 30 and the outer fan 40 located in the dual channels respectively.

[0056] Thus, on the one hand, a two-way airflow passage is formed within a single wall opening, enabling continuous directional air delivery by dual fans without the need for double-hole construction. This avoids the airflow interruption problem caused by the intermittent reversal of the reversible fan, thereby improving ventilation stability. On the other hand, the duct assembly 20 and core components such as the fan are centrally located for embedding in the wall opening, resulting in a compact structure. This avoids the concentration of components in the indoor panel assembly 10, effectively miniaturizing the panel assembly 10 and reducing the space occupied by the fresh air unit 1 indoors, thereby improving the user experience.

[0057] In some embodiments, such as Figures 1-2 As shown, the panel assembly 10 may include a housing 100 and a partition 200. For example... Figure 2 and Figure 3 As shown, the interior of the housing 100 is hollow and includes an inner panel 110 connected to the air duct assembly 20 and an outer panel 120 connected to the inner panel 110. A partition 200 extends vertically and is disposed between the inner panel 110 and the outer panel 120. Thus, the fresh air chamber 11 and the return air chamber 12 are horizontally spaced within the housing 100.

[0058] Additionally, the housing 100 has a fresh air outlet 13 and a return air inlet 14 spaced apart. The fresh air outlet 13 is used to transport fresh air from the outside to the inside, and the return air inlet 14 is used to transport return air from the inside to the outside. A partition 200 is disposed inside the housing 100, and the partition 200 and the housing 100 define a fresh air cavity 11 communicating with the fresh air outlet 13 and a return air cavity 12 communicating with the return air inlet 14.

[0059] In the fresh air unit 1 of this utility model embodiment, the housing 100 of the panel assembly 10 cooperates with the partition 200 to clearly separate the fresh air cavity 11 and the return air cavity 12 within the housing 100. The housing 100 is provided with corresponding fresh air outlet 13 and return air inlet 14, so that when the fresh air unit 1 is working, the fresh air flow passes through the fresh air cavity 11 and enters the room through the fresh air outlet 13, and the return air flow in the room enters the return air cavity 12 through the return air inlet 14, thus achieving strict separation of the airflow inside the panel assembly 10.

[0060] Therefore, the fresh air unit 1 of this utility model, by setting a partition 200 inside the housing 100, avoids the mixing or disorder of fresh air flow and return air flow in the panel assembly 10, ensuring the orderly flow of air in the panel assembly 10, thereby improving the ventilation efficiency and further enhancing the user experience.

[0061] In some embodiments, such as Figure 2 and Figure 3 As shown, specifically, as Figure 3 As shown,

[0062] In one specific embodiment, a fresh air cavity 11 is defined between the partition 200 and a portion of the inner panel 110 and the outer panel 120, and a return air cavity 12 is defined between the partition 200 and another portion of the inner panel 110, so as to form a fresh air cavity 11 and a return air cavity 12 spaced apart in the direction from indoors to outdoors.

[0063] In some embodiments, such as Figure 2 As shown, the housing 100 has a first through hole 111 on the side adjacent to the air duct assembly 20, which communicates with both the fresh air duct 21 and the return air duct 22. The partition 200 has a second through hole 210 on the side adjacent to the first through hole 111, which communicates with the fresh air duct 21.

[0064] Specifically, the first through hole 111 and the second through hole 210 are coaxially arranged, and the second through hole 210 is located radially inside the first through hole 111. Based on this, the fresh air chamber 11 and the fresh air channel 21 are connected through the second through hole 210, and the return air chamber 12 and the return air channel 22 are connected through the gap between the first through hole 111 and the second through hole 210.

[0065] Therefore, in this embodiment of the present invention, the fresh air unit 1 is coaxially arranged with the first through hole 111 of the housing 100 and the second through hole 210 of the partition 200, and the second through hole 210 is located radially inside the first through hole 111. This clearly defines the connection path between the fresh air flow and the return air flow between the panel assembly 10 and the duct assembly 20, achieving strict separation of the two airflows at the transition point and avoiding cross-interference. At the same time, the coaxial layout makes the airflow smoother at the component connection point, reduces airflow resistance, improves the overall ventilation efficiency, and also makes the structure more compact, reducing the space occupied by the duct assembly 20.

[0066] In some embodiments, such as Figure 3 As shown, the partition 200 has a guide slope that gradually extends from the second through hole 210 toward the fresh air outlet 13 at a position adjacent to the second through hole 210, so as to guide the airflow in the fresh air cavity 11 to flow orderly from the second through hole 210 to the fresh air outlet 13, thereby improving the air outlet efficiency of the fresh air flow and thus improving the fresh air exchange efficiency of the fresh air unit 1.

[0067] Specifically, the first through hole 111 and the second through hole 210 are coaxially arranged, and the second through hole 210 is located radially inside the first through hole 111. Based on this, the fresh air chamber 11 and the fresh air channel 21 are connected through the second through hole 210, and the return air chamber 12 and the return air channel 22 are connected through the gap between the first through hole 111 and the second through hole 210.

[0068] Therefore, in this embodiment of the present invention, the fresh air unit 1 is coaxially arranged with the first through hole 111 of the housing 100 and the second through hole 210 of the partition 200, and the second through hole 210 is located radially inside the first through hole 111. This clearly defines the connection path between the fresh air flow and the return air flow between the panel assembly 10 and the duct assembly 20, achieving strict separation of the two airflows at the transition point and avoiding cross-interference. At the same time, the coaxial layout makes the airflow smoother at the component connection point, reduces airflow resistance, improves the overall ventilation efficiency, and also makes the structure more compact, reducing the space occupied by the duct assembly 20.

[0069] In some embodiments, such as Figure 2 and Figure 3 As shown, the housing 100 can be a vertically extending rectangular structure. Thus, after the air duct assembly 20 is embedded in the opening in the wall and extends from the indoor to the outdoor, the panel assembly 10 can be set close to the wall, so that the indoor fresh air unit 1 can be adapted to wall-mounted installation scenarios to save indoor space.

[0070] In this embodiment, the fresh air outlet 13 and the return air inlet 14 can be respectively opened on two opposite side walls of the housing 100. That is, the fresh air outlet 13 and the return air inlet 14 are arranged opposite each other and have opposite opening directions, which effectively avoids the short circulation phenomenon where the fresh air flow is sucked into the return air inlet 14 as soon as it enters the room, thus improving the utilization efficiency of fresh air.

[0071] In some embodiments, such as Figures 1-3 As shown, the air duct assembly 20 may include a cylinder 300 and a heat exchange assembly 400. For example... Figure 2 and Figure 3 As shown, the end of the cylinder 300 away from the panel assembly 10 has a fresh air inlet 23 and a return air outlet 24 spaced apart. Specifically, the cylinder 300 can be a cylindrical structure that extends horizontally along the axial direction.

[0072] A heat exchange component 400 is disposed inside the cylinder 300 for heat exchange treatment of the airflow entering the cylinder 300, and a fresh air passage 21 and a return air passage 22 are defined between the heat exchange component 400 and the cylinder 300. Specifically, the heat exchange component 400 can be a cylindrical structure that extends horizontally along the axial direction, and its internal part is hollow to facilitate airflow.

[0073] In addition, the fresh air duct 21 is used to connect the fresh air inlet 23 and the fresh air outlet 13, and the return air duct 22 is used to connect the return air inlet 14 and the return air outlet 24.

[0074] In other words, the fresh air unit 1 of this utility model is composed of a cylinder 300 with a fresh air inlet 23 and a return air outlet 24 and a heat exchange component 400 built into the cylinder 300. The heat exchange component 400 and the cylinder 300 define an isolated fresh air channel 21 and a return air channel 22, so that when the fresh air unit 1 is working, both the fresh air flow and the return air flow can fully exchange heat with the heat exchange component 400.

[0075] Therefore, the fresh air unit 1 of this utility model realizes the heat exchange between the fresh air flow and the return air flow through the heat exchange component 400 inside the cylinder 300. When the temperature difference between indoor and outdoor is large, the temperature of the fresh air flow can be adaptively adjusted by the cold / heat of the return air flow stored in the heat exchange component 400, without the need to set up other cooling / heating devices, thereby improving the energy efficiency of the fresh air unit 1.

[0076] In some embodiments, such as Figures 3-5 As shown, the heat exchange assembly 400 may include a first annular end cap 410, a second annular end cap 420, and a heat exchange core 430. The second annular end cap 420 is axially spaced from the first annular end cap 410, and the heat exchange core 430 is disposed between the first annular end cap 410 and the second annular end cap 420. Figure 5 As shown, the first annular end cap 410 is provided with multiple first air inlets 4131 and multiple first air outlets 4112. Figure 7 As shown, the second annular end cap 420 is provided with multiple second air inlets 4231 and multiple second air outlets 4212. The multiple second air inlets 4231 are opposite to the multiple first air outlets 4112, and the multiple second air outlets 4212 are opposite to the multiple first air inlets 4131.

[0077] In addition, such as Figure 5 As shown, the heat exchange core 430 is provided with a plurality of first channels 4311 and a plurality of second channels 432 extending axially along the annular end cap. Specifically, each first channel 4311 is used to connect a first air inlet 4131 and a second air outlet 4212 opposite thereto, and each second channel 432 is used to connect a second air inlet 4231 and a second air outlet 4212 opposite thereto.

[0078] During the operation of the heat exchange component 400, airflow on one side of the indoor and outdoor sides can enter the first channel 4311 through the first air inlet 4131 and flow out through the corresponding second air outlet 4212. At the same time, airflow on the other side enters the second channel 432 through the second air inlet 4231 and flows out through the corresponding first air outlet 4112, thus realizing independent bidirectional airflow.

[0079] Therefore, the heat exchange assembly 400 of this embodiment forms a compact, axially stacked structural frame by providing an axially spaced first annular end cap 410 and a second annular end cap 420, and a heat exchange core 430 disposed between them. Furthermore, the heat exchange assembly 400 of this embodiment can achieve bidirectional independent air inlet and outlet by providing axially extending parallel multi-channels, which facilitates the reduction of the radial dimension of the heat exchange core 430, thereby effectively miniaturizing the heat exchange assembly 400 and improving its spatial adaptability.

[0080] In some embodiments, such as Figure 3 As shown, the first annular end cap 410 can be disposed adjacent to the indoor fan 30, and the second annular end cap 420 can be disposed adjacent to the outdoor fan 40. The interconnected first air inlet 4131, first channel 4311, and second air outlet 4212 form a return air channel 22 for discharging indoor return airflow to the outside. The interconnected second air inlet 4231, second channel 432, and first air outlet 4112 form a fresh air channel 21 for transporting outdoor fresh airflow to the indoor environment. Thus, multiple fresh air channels 21 and multiple return air channels 22 can be defined between the heat exchange component 400 and the cylinder 300, allowing for sufficient contact between the fresh airflow and return airflow and the heat exchange component 400, thereby improving heat exchange efficiency.

[0081] In some embodiments, such as Figure 5 As shown, the heat exchange core 430 is annular, achieving precise fit between the annular heat exchange core 430 and the annular end cap, thus enhancing the compactness of the overall structure of the heat exchange assembly 400. Furthermore, multiple first channels 4311 and multiple second channels 432 are alternately arranged along the circumference of the annular end cap. Therefore, multiple fresh air channels 21 and multiple return air channels 22 can be alternately arranged along the circumference of the cylinder 300. When the internal fan 30 and the external fan 40 operate together and enter full-heat mode, multiple channels can simultaneously deliver airflow, significantly increasing the indirect contact area and contact time between the fresh air and return airflows via the heat exchange assembly 400.

[0082] As a result, the fresh air flow and return air flow can be evenly distributed circumferentially and fully contact the heat exchange core 430, avoiding local heat exchange dead zones and significantly improving heat exchange uniformity and efficiency.

[0083] In some embodiments, the annular end cap may include an inner peripheral wall, an outer peripheral wall, and a front end wall. The inner peripheral wall is annular and defines a central hole having a bore axis. The outer peripheral wall is annular and is fitted radially outward of the inner peripheral wall. Specifically, both the inner and outer peripheral walls may be cylindrical structures extending axially in a horizontal direction, and the radial dimension of the inner peripheral wall is smaller than that of the outer peripheral wall. The front end wall extends inward from the axial end of the outer peripheral wall to the inner peripheral wall, and together with the inner and outer peripheral walls, defines an annular cavity for receiving one axial end of the heat exchange core 430. Specifically, the shape and size of the annular cavity projected in the axial direction are adapted to the shape and size of the heat exchange core 430 projected in the axial direction, so that the heat exchange core 430 is connected to the annular end cap by axially inserting one axial end into the annular cavity from the side opposite to the front end wall.

[0084] Therefore, the heat exchange component 400 of this utility model realizes the axial positioning of the heat exchange core 430 by setting an annular cavity composed of an inner peripheral wall, an outer peripheral wall and a front end wall, effectively ensuring the assembly stability of the heat exchange core 430 and the annular end cover, avoiding the heat exchange core 430 from shifting during operation, ensuring the precise docking of the channel and the air inlet and outlet, and improving the structural stability of the heat exchange component 400.

[0085] In some embodiments, the axial dimension of the inner peripheral wall is greater than the axial dimension of the outer peripheral wall, and the axial end of the inner peripheral wall adjacent to the front end wall extends beyond the axial end of the outer peripheral wall adjacent to the front end wall to radially separate the central hole and the air inlet, thereby preventing the airflow of the air inlet from interfering with the converging airflow in the central hole.

[0086] Additionally, the annular end cap may also include a rear end wall. The rear end wall is in the shape of a circular plate, and its radial edge is fixedly connected to the axial end of the inner peripheral wall away from the front end wall to completely seal the axial port of the central hole away from the front end wall. Specifically, the axial end of the inner peripheral wall away from the front end wall and the axial end of the outer peripheral wall away from the front end wall are arranged radially flush, and the rear end wall extends radially inward from the axial end of the outer peripheral wall away from the front end wall to the axial end of the inner peripheral wall away from the front end wall.

[0087] In the above embodiments, such as Figure 5 and Figure 6 As shown, the first annular end cap 410 may include a first inner peripheral wall 411, a first outer peripheral wall 412, a first front end wall 413, and a first rear end wall 414, with the first inner peripheral wall 411 being hollow and defining a first central hole 4111. Figure 5 and Figure 7 As shown, the second annular end cap 420 may include a second inner peripheral wall 421, a second outer peripheral wall 422, a second front end wall 423 and a second rear end wall 424, with the second inner peripheral wall 421 being hollow and forming a second central hole 4211.

[0088] During the operation of the heat exchange component 400, the fresh airflow enters the multiple second channels 432 through the multiple second air inlets 4231, is blocked by the first rear end wall 414, and is blown out through the multiple first air outlets 4112, converging at the first central hole 4111. It is then separated from the return airflow by the separation effect of the first inner peripheral wall 411. Similarly, the return airflow enters the multiple first channels 4311 through the multiple first air inlets 4131, is blown out through the multiple second air outlets 4212, and converges at the second central hole 4211 under the convergence effect of the second rear end wall 424 and the second inner peripheral wall 421. It is then separated from the fresh airflow by the separation effect of the second inner peripheral wall 421.

[0089] Therefore, the heat exchange component 400 of this utility model embodiment, by setting an inner peripheral wall extending from the outer peripheral wall and a rear end wall for sealing one side of the central hole, ensures that all airflow flowing from the air outlet into the central hole flows along a preset path, further optimizing the flow channel layout, ensuring the airflow independence of the first channel 4311 and the second channel 432, effectively preventing the mixing of airflows from different paths, avoiding airflow interference and loss during the heat exchange process, and thus further improving the heat exchange efficiency.

[0090] In some embodiments, a plurality of air inlets on each annular end cap are arranged circumferentially spaced along the front end wall, and each air inlet penetrates the front end wall in a direction parallel to the hole axis. Additionally, a plurality of air outlets on each annular end cap are arranged circumferentially spaced along the inner peripheral wall, and each air outlet penetrates the inner peripheral wall radially, so that the airflow from the plurality of air outlets converges at the central hole. Specifically,

[0091] Specifically, the second annular end cap 420 is coaxially arranged with the first annular end cap 410. Multiple second air inlets 4231 are directly opposite to multiple first air outlets 4112, and multiple second air outlets 4212 are directly opposite to multiple first air inlets 4131. The axial projections of the multiple first air inlets 4131 and the multiple second air inlets 4231 are alternately staggered, and the axial projections of the multiple first air outlets 4112 and the multiple second air outlets 4212 are alternately staggered. Thus, each first channel 4311 and second channel 432 extends straight along a direction parallel to the hole axis, reducing airflow resistance within the channels.

[0092] During the operation of the heat exchange component 400, both fresh air and return air can smoothly enter the air inlet along the axial direction, and then flow smoothly along the axial direction. Finally, they converge at the central hole through the radial air outlet, forming an orderly flow path of axial air intake and radial convergence.

[0093] Therefore, by optimizing the opening position and extension direction of the air inlet and outlet, the heat exchange component 400 of this utility model significantly reduces airflow resistance, avoids airflow turbulence in each channel, and ensures efficient convergence of airflow from the outlet to the central hole, reducing energy loss and further improving the airflow efficiency and heat exchange effect of the heat exchange component 400.

[0094] In some embodiments, such as Figure 4 and Figure 5 As shown, the heat exchange core 430 may include a plurality of heat exchange flat tubes 431, and the plurality of heat exchange flat tubes 431 are arranged in a ring-shaped interval along the circumference of the annular cavity. Each heat exchange flat tube 431 extends from a first air inlet 4131 to its corresponding second air outlet 4212 and is hollow to form a first channel 4311, and a second channel 432 is defined between every two adjacent heat exchange flat tubes 431.

[0095] During the operation of the heat exchange component 400, the indoor return airflow flows through the first channel 4311 within the heat exchange flat tube 431 and exchanges heat with the tube wall of the heat exchange flat tube 431, allowing the heat exchange flat tube 431 to recover the heat from the return airflow. The outdoor fresh airflow flows through the second channel 432 between adjacent heat exchange flat tubes 431 and makes full contact with the tube wall of the heat exchange flat tube 431, utilizing the heat recovered by the heat exchange flat tube 431 for heat exchange. Thus, the fresh airflow and return airflow can indirectly contact each other through the tube wall of the heat exchange flat tube 431, thereby achieving efficient heat exchange.

[0096] In some embodiments, such as Figure 5 and Figure 8 As shown, each heat exchange flat tube 431 is trapezoidal square tube in shape, having an inner wall adjacent to the inner peripheral wall, an outer wall adjacent to the outer peripheral wall, and two side walls extending from the two circumferential edges of the inner wall to the two circumferential edges of the outer wall. The axial projection of each heat exchange flat tube 431 is an isosceles trapezoid with the inner wall as the upper base and the bottom wall as the lower base.

[0097] Therefore, the heat exchange component 400 of this utility model adopts multiple trapezoidal square tube heat exchange flat tubes 431 to form a heat exchange core 430, which simplifies the structural design of the heat exchange core 430, facilitates processing and manufacturing, and greatly increases the airflow contact area and heat exchange area, thus significantly improving the heat exchange efficiency.

[0098] In some embodiments, such as Figure 5As shown, each heat exchange flat tube 431 is arranged radially and uniformly along the circumference of the annular cavity, and the circumferential dimension of each heat exchange flat tube 431 is equivalent to the circumferential distance between every two adjacent heat exchange flat tubes 431. Thus, the axial projection of the first channel 4311 can have the same shape and size as the axial projection of the second channel 432, so as to balance the flow rates of the fresh air and return air flowing through the heat exchange core 430.

[0099] Therefore, the heat exchange component 400 of this utility model improves the uniformity of the distribution of fresh air and return air by setting the first channel 4311 and the second channel 432 to have the same projection shape and equal size in the axial direction, and the circumferentially spaced arrangement further ensures the uniformity of airflow distribution.

[0100] Specifically, such as Figure 4 , Figure 5 and Figure 8 As shown, the heat exchange flat tube 431 has an air inlet 4312 at one end near the first annular end cap 410, which is directly opposite to the first air inlet 4131, and an air outlet 4313 is provided at the other end of the heat exchange flat tube 431 near the central hole, which is directly opposite to the second air outlet 4212.

[0101] In some embodiments, the annular end cap may further include a plurality of connecting ribs extending along the hole axis and arranged circumferentially spaced within the annular cavity. Each connecting rib connects to an inner peripheral wall and an outer peripheral wall on its radial sides, respectively, and every two adjacent connecting ribs, together with the inner and outer peripheral walls, define a slot for receiving one axial end of the heat exchange flat tube 431, facilitating the connection of the heat exchange flat tube 431 to the annular end cap by axial insertion into the slot. Additionally, the annular end cap may be a one-piece molded component to improve structural stability.

[0102] In the above embodiments, such as Figure 6 As shown, the first annular end cap 410 may include a plurality of first connecting ribs 415, and every two adjacent first connecting ribs 415 together with the first inner peripheral wall 411 and the first outer peripheral wall 412 define a first slot 416. Every two adjacent first slots 416 are respectively connected to the first air inlet 4131 and the first air outlet 4112, and the first slot 416 connected to the first air inlet 4131 can be used to accommodate one axial end of the heat exchange flat tube 431.

[0103] like Figure 5As shown, the second annular end cap 420 may include a plurality of second connecting ribs 425, and every two adjacent second connecting ribs 425 together with the second inner peripheral wall 421 and the second outer peripheral wall 422 define a second slot 426. Every two adjacent second slots 426 are respectively connected to the second air inlet 4231 and the second air outlet 4212, and the second slot 426 connected to the second air outlet 4212 can be used to accommodate the other axial end of the heat exchange flat tube 431.

[0104] During installation, both axial ends of each heat exchange flat tube 431 are inserted into a first slot 416 communicating with the first air inlet 4131 and a second slot 426 communicating with the second air outlet 4212, respectively, to achieve installation between the first annular end cap 410, the second annular end cap 420, and the heat exchange core 430. Simultaneously, the multiple first slots 416 communicating with the first air outlet 4112 and the multiple second slots 426 communicating with the second air inlet 4231 are arranged facing each other to form multiple second channels 432.

[0105] Therefore, the heat exchange assembly 400 of this utility model simplifies the assembly process of the heat exchange flat tube 431 and the annular end cap by setting connecting ribs and slots, and can achieve precise positioning without complex connecting parts. At the same time, the connecting ribs enhance the structural strength of the annular end cap and prevent the end cap from deforming, while the slots ensure the assembly stability of the heat exchange flat tube 431 and prevent loosening during operation, thereby improving the assembly convenience and structural reliability of the heat exchange assembly 400.

[0106] In some embodiments, such as Figure 3 As shown, the cylindrical body 300 may include a sleeve 310, an air inlet shroud 320, and an air outlet shroud 330. The sleeve 310 is a hollow cylindrical structure with openings on both sides, used to cover the outer periphery of the heat exchange assembly 400. The air outlet shroud 330 is a hollow cylindrical structure with an opening on one side, with its open end connected to the end of the sleeve 310 away from the panel assembly 10. The air inlet shroud 320 is a hollow cylindrical structure with openings on both sides, and is fitted into the open end of the air outlet shroud 330.

[0107] Specifically, the exhaust shroud 330 has a side opening 28 and a return air outlet 24 at the end furthest from the main opening. A fresh air inlet 23 is provided on the intake shroud 320 at a position opposite to the side opening 28. The intake shroud 320 and the exhaust shroud 330 are configured to rotate relative to each other circumferentially to adjust the overlap area of ​​the side opening 28 and the fresh air inlet 23, thereby adjusting the intake volume of fresh air.

[0108] Therefore, the fresh air unit 1 of this embodiment, through the structural design of the sleeve 310, air inlet cover 320, and air outlet cover 330 of the cylinder 300, provides a stable installation space for the heat exchange component 400, while clearly defining the flow paths of fresh air and return air. Furthermore, the air inlet cover 320 and air outlet cover 330 can rotate relative to each other circumferentially. By adjusting the overlapping area of ​​the side opening 28 and the fresh air inlet 23, the fresh air intake volume can be flexibly controlled to meet the fresh air needs in different scenarios. Thus, the fresh air unit 1 of this embodiment, through the optimized structure of the sleeve 310, not only ensures smooth airflow but also improves the flexibility of use and enhances the user experience.

[0109] In some embodiments, such as Figure 3 As shown, the air outlet cover 330 has a downwardly extending sloping cross section at the end away from the opening, and the side opening 28 is opened in the middle of the air outlet cover 330 in the vertical direction, while the return air outlet 24 is opened at the bottom of the air outlet cover 330 in the vertical direction.

[0110] Therefore, the fresh air unit 1 of this utility model extends downward at an angle through the cross-section of the air outlet hood 330. Combined with the design of the side opening 28 located in the middle of the vertical section and the return air outlet 24 located at the bottom of the vertical section, it can guide the return airflow to be discharged smoothly along the cross-section, reduce exhaust resistance, and at the same time prevent outdoor debris from entering the cylinder 300 through the return air outlet 24, thereby improving the smoothness of return air discharge and the protection of the equipment.

[0111] In addition, such as Figure 3 As shown, the air outlet cover 330 can have multiple side openings 28, and correspondingly, the air inlet cover 320 can also have multiple sets of fresh air inlets 23, and each set of fresh air inlets 23 includes multiple fresh air inlets 23, and the multiple side openings 28 correspond one-to-one with the multiple sets of fresh air inlets 23 and can be set facing each other.

[0112] In one specific embodiment, such as Figure 3 As shown, the air outlet cover 330 has two side openings 28 on the middle of the vertical direction and on the two radially opposite sides. Correspondingly, the air inlet cover 320 also has two sets of fresh air inlets 23, and each set of fresh air inlets 23 includes multiple fresh air inlets 23.

[0113] Therefore, the fresh air unit 1 of this utility model embodiment is configured with multiple side openings 28 corresponding to multiple sets of fresh air inlets 23, which greatly increases the contact range between fresh air and side openings 28. With the relative rotation of air inlet cover 320 and air outlet cover 330, multi-level adjustment of air intake can be achieved to meet the fresh air needs in different scenarios.

[0114] In addition, the fresh air unit 1 of this utility model, through the combination of two radially opposite side openings 28 and two sets of fresh air inlets 23, allows fresh air to enter from both sides at the same time, making the airflow more evenly distributed in the cylinder 300, improving the contact efficiency between the heat exchange component 400 and the fresh air, further optimizing the heat exchange effect, and taking into account both the flexibility of air volume adjustment and the stability of airflow.

[0115] In some embodiments, such as Figure 2 and Figure 3 As shown, the air duct assembly 20 also includes an inner cylinder 510 and an outer cylinder 520, which can be used to install and support the internal fan 30. Specifically, the two ends of the inner cylinder 510 are connected to the heat exchange assembly 400 and the partition plate 200, respectively, and its interior is hollow to form an air inlet cavity 25 for connecting the fresh air duct 21 and the fresh air chamber 11. The two ends of the outer cylinder 520 are connected to the cylinder body 300 and the shell 100, respectively, and the outer cylinder 520 is located radially outside the inner cylinder 510 and forms an air outlet cavity 26 at intervals with the inner cylinder 510 for connecting the return air chamber 12 and the return air duct 22.

[0116] In other words, the inner cylinder 510 and the outer cylinder 520 are arranged radially at intervals to form a double-layer air cavity structure, so as to realize the connection between the fresh air channel 21 and the fresh air cavity 11, and the connection between the return air cavity 12 and the return air channel 22, respectively.

[0117] In addition, the internal fan 30 is arranged in the air inlet cavity 25 along the axial direction of the cylinder 300. It is used to guide the fresh air flow from the fresh air inlet 23 into the cylinder 300 and then flow through the fresh air channel 21, the air inlet cavity 25 and the fresh air cavity 11 in sequence, and then be discharged through the fresh air outlet 13.

[0118] Therefore, the fresh air unit 1 of this utility model embodiment, through the radial spacing design of the inner cylinder 510 and the outer cylinder 520, not only ensures the stable installation of the inner fan 30, but also realizes the independence of the fresh air flow path and the return air flow path, and also makes the airflow smoothly transition between components, thereby improving the stability of fresh air delivery.

[0119] In some embodiments, such as Figure 2 and Figure 3 As shown, the air duct assembly 20 also includes an external fan 40 bracket 600, which can be used to install and support the internal fan 30. Specifically, the two ends of the external fan 40 bracket 600 are connected to the heat exchange assembly 400 and the cylinder 300, respectively, and its interior is hollow to form an exhaust cavity 27 for connecting the return air channel 22 and the return air outlet 24. The external fan 40 is arranged in the exhaust cavity 27 along the axial direction of the cylinder 300, and is used to guide the fresh air flow from the return air inlet 14 into the housing 100 and then flow sequentially through the return air cavity 12, the air outlet cavity 26 and the return air channel 22, and is discharged through the return air outlet 24.

[0120] In other words, the bracket 600 of the external fan 40 forms an exhaust cavity 27 that connects the return air channel 22 and the return air outlet 24, and the external fan 40 is axially and horizontally extended within the exhaust cavity 27.

[0121] Therefore, in this embodiment of the present invention, the fresh air unit 1 is equipped with an external fan 40 by an external fan 40 bracket 600, and defines an exhaust cavity 27 that connects the return air channel 22 and the return air outlet 24, providing a dedicated path for the exhaust of the return airflow so as to cooperate with the internal fan 30 to form a complete cycle, ensuring that the return airflow can be efficiently exhausted to the outside, thereby achieving the stability of indoor stale air exhaust.

[0122] In some embodiments, such as Figure 1 and Figure 3 As shown, the panel assembly 10 may further include a first damper 710 and a second damper 720. The first damper 710 is rotatably disposed within the fresh air chamber 11 and is used to open or close the fresh air outlet 13. The second damper 720 is rotatably disposed within the return air chamber 12 and is used to open or close the return air inlet 14.

[0123] like Figure 3 As shown, both the fresh air outlet 13 and the return air inlet 14 can be vertically extending rectangular openings. Based on this, both the first damper 710 and the second damper 720 can be vertically extending rectangular plates, and the pivots of both the first damper 710 and the second damper 720 can be vertically extending.

[0124] Thus, the first damper 710 and the second damper 720 within the panel assembly 10 can rotatably control the opening and closing of the fresh air outlet 13 and the return air inlet 14, so that users can adjust the airflow according to their needs through the dampers and close the corresponding dampers when fresh air or return air is not needed, increasing the flexibility of the use of the fresh air unit 1.

[0125] In some alternative embodiments, the first damper 710 and the second damper 720 can be opened manually, respectively. For example, Figure 1 and Figure 3 As shown, the panel assembly 10 may further include a first knob 810 and a second knob 820. The first knob 810 is rotatably mounted on the housing 100 and is drivenly connected to the first damper 710, for driving the first damper 710 to rotate. The second knob 820 is rotatably mounted on the housing 100 and is drivenly connected to the second damper 720, for driving the second damper 720 to rotate.

[0126] Specifically, the first knob 810 and the second knob 820 can both be circular plate-shaped structures with a vertically extending rotating shaft, with threads formed on their outer circumferential side, and at least partially extending out of the housing 100 so that the user can make manual adjustments, thereby realizing the flexible opening and closing of the fresh air outlet 13 and the return air inlet 14.

[0127] Therefore, by setting a first knob 810 and a second knob 820, the user can conveniently control the opening and closing status of the air damper at any time by turning the knobs during the operation of the fresh air unit 1. The operation is intuitive and simple, which improves the user's control experience of the fresh air unit 1.

[0128] In some alternative embodiments, the first damper 710 and the second damper 720 can also be controlled and driven separately to automatically adjust the opening and closing states of the fresh air outlet 13 and the return air inlet 14. For example, the first damper 710 and the second damper 720 can automatically control their opening and closing states according to the indoor and outdoor temperatures and the indoor air quality.

[0129] In this embodiment, the fresh air unit 1 further includes a first temperature sensor and an air quality sensor disposed on the indoor side, and a second temperature sensor disposed on the outdoor side. The first temperature sensor is used to detect the indoor temperature, and the second temperature sensor is used to detect the outdoor temperature. The air quality sensor is used to detect the indoor air quality, such as the CO2 content. Specifically, the air quality sensor can be a CO2 sensor to detect the CO2 content in the indoor air.

[0130] In addition, the fresh air unit 1 can have multiple working modes. In each working mode, the first damper 710 can be opened or closed synchronously with the indoor fan 30, and the second damper 720 can be opened or closed synchronously with the outdoor fan 40.

[0131] In one specific embodiment, the internal fan 30 and the external fan 40 can be turned on simultaneously, only one of them can be turned on, or both can be turned off. Correspondingly, the first damper 710 and the second damper 720 can also be turned on simultaneously, only one of them can be turned on, or both can be turned off.

[0132] Specifically, the fresh air unit 1 can have the following four operating modes:

[0133] ①Full heat mode: When the temperature difference between indoor and outdoor is greater than the preset temperature, the first damper 710 and the second damper 720 open at the same time, and the indoor fan 30 and the outdoor fan 40 operate at the same time to supply fresh air and exhaust sewage air simultaneously.

[0134] In other words, the full heat mode is activated when there is a large temperature difference between indoors and outdoors. By simultaneously opening the dampers and running dual fans, it achieves the simultaneous introduction of fresh air and the exhaust of stale air. Combined with the energy recovery function of the heat exchange component 400, it can efficiently complete air replacement while reducing indoor energy loss caused by excessive temperature difference, and significantly reducing the load on the fresh air unit 1. It is especially suitable for scenarios with significant temperature differences in winter and summer, taking into account both ventilation effect and energy saving requirements.

[0135] ② Air supply mode: When the temperature difference between indoor and outdoor is less than or equal to the preset temperature, the first air damper 710 opens, the second air damper 720 closes, the indoor fan 30 runs, and the outdoor fan 40 stops running, so as to deliver fresh air to the room.

[0136] In other words, the air supply mode is designed for situations where the temperature difference between indoors and outdoors is small. It only opens the first air damper 710 and operates the indoor fan 30 to open the fresh air flow channel in one direction. While ensuring the introduction of fresh outdoor air, it avoids energy loss during the exhaust of return air. It not only meets the basic indoor demand for fresh air, but also reduces the energy consumption of the fresh air unit 1 by reducing the number of fans in operation. It is suitable for use in transitional seasons with small temperature differences, such as spring and autumn.

[0137] ③ Exhaust mode: This mode is automatically activated when the indoor air quality is lower than the lower limit of the preset quality threshold range, or when the user feels that the indoor air quality is poor. This mode will close the first damper 710, open the second damper 720, stop the internal fan 30, and start the external fan 40 to exhaust the sewage air to the outside in one direction.

[0138] In other words, the exhaust mode focuses on scenarios with poor indoor air quality. It only opens the second air damper 720 and operates the outdoor fan 40 to open the return airflow channel in one direction, quickly expelling the indoor polluted air to the outside. It can reduce the concentration of indoor pollutants in a short time and supports automatic triggering and manual control, which improves the flexibility of dealing with sudden air quality problems, such as the accumulation of oil fumes after cooking or the air pollution caused by the gathering of many people. It can quickly improve the indoor air environment.

[0139] ④ Automatic mode: When the indoor air quality is higher than the upper limit of the preset quality threshold range, it will automatically enter the full heating mode; when the indoor air quality is lower than the upper limit of the preset quality threshold range but higher than the lower limit of the preset quality threshold range, it will automatically enter the air supply mode; when the indoor air quality is lower than the lower limit of the preset quality threshold range, it will automatically enter the exhaust mode.

[0140] In other words, the automatic mode monitors indoor air quality in real time and automatically switches between full heating mode, air supply mode, and exhaust mode. It can maintain indoor air quality within the preset range without manual intervention from the user, realizing the intelligent operation of the fresh air unit 1 and reducing the user's operating burden. It is especially suitable for users who do not have time to frequently adjust the fresh air unit 1, ensuring that the indoor air environment is always comfortable.

[0141] It should be noted that the preset temperature can be obtained from prior experiments and stored in the fresh air unit 1. Specifically, the preset temperature can be selected from any value between 3℃ and 10℃. For example, a preset temperature can be set to 5℃.

[0142] In addition, the preset quality threshold range can also be obtained and stored in the fresh air unit 1 based on prior experiments. Specifically, the preset quality threshold range can be set according to the CO2 content in the indoor air.

[0143] For example, when the CO2 concentration is ≤700ppm, the upper limit of the indoor air quality is determined to be higher than the preset quality threshold range; when the CO2 concentration is ≤900ppm, the upper limit of the indoor air quality is determined to be lower than the preset quality threshold range and higher than the preset quality threshold range; when the CO2 concentration is >900ppm, the lower limit of the indoor air quality is determined to be lower than the preset quality threshold range.

[0144] In summary, the synergistic design of the four modes enables the fresh air unit 1 to dynamically adjust its operating status according to environmental parameters and actual needs, maximizing energy efficiency while ensuring air exchange effect, and taking into account functionality, economy and user experience, thus significantly improving the overall performance of the fresh air unit 1.

[0145] Therefore, the fresh air unit 1 of this utility model embodiment, by setting multiple working modes, realizes different and precise operating schemes for different environmental conditions and user needs, which significantly improves the adaptability and energy efficiency of the fresh air unit 1.

[0146] Those skilled in the art should also understand that, in the embodiments of this utility model, "indoor" refers to the indoor space where the panel assembly 10 of the fresh air unit 1 is located, and "outdoor" refers to the outdoor environmental space where the fresh air inlet 23 and the return air outlet 24 are located. Furthermore, the terms "upper," "lower," "front," "rear," "top," "bottom," "left," "right," "inner," and "outer" used to indicate orientation or positional relationships in the embodiments of this utility model are based on the actual usage state of the fresh air unit 1. These terms are only for the convenience of describing and understanding the technical solution of this utility model, and are not intended to indicate or imply that the device or device 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 utility model.

[0147] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A fresh air machine characterized by, include: A panel assembly that defines an intermittently spaced fresh air cavity and return air cavity; A duct assembly is connected to the panel assembly, and the duct assembly defines a fresh air channel and a return air channel that are spaced apart and communicate with the fresh air cavity and the return air cavity respectively. An internal fan is installed inside the fresh air duct to facilitate the flow of fresh air through the fresh air duct and the fresh air chamber before it is discharged. as well as An external fan is installed inside the return air duct to facilitate the return airflow to flow sequentially through the return air chamber and the return air duct before being discharged.

2. The fresh air machine of claim 1, wherein, The panel assembly includes: The housing is hollow inside, and has spaced-apart fresh air outlets and return air inlets; and A partition is disposed within the housing, and the partition and the housing define a fresh air cavity communicating with the fresh air outlet and a return air cavity communicating with the return air inlet.

3. The fresh air system according to claim 2, characterized in that, The air duct assembly includes: The cylindrical body has a fresh air inlet and a return air outlet spaced apart at one end away from the panel assembly; A heat exchange assembly is disposed inside the cylinder for heat exchange treatment of the airflow entering the cylinder, and the heat exchange assembly and the cylinder define the fresh air passage and the return air passage, wherein the fresh air passage is used to connect the fresh air inlet and the fresh air outlet, and the return air passage is used to connect the return air inlet and the return air outlet.

4. The fresh air system according to claim 3, characterized in that, The heat exchange component and the cylinder define a plurality of fresh air channels and a plurality of return air channels, and the plurality of fresh air channels and the plurality of return air channels are arranged alternately in sequence along the circumferential direction of the cylinder.

5. The fresh air system according to claim 3, characterized in that, The air duct assembly also includes: The inner cylinder, with its two ends connected to the heat exchange assembly and the partition plate respectively, and its hollow interior forming an air inlet cavity for connecting the fresh air duct and the fresh air chamber; and An outer cylinder, with its two ends connected to the cylinder body and the shell respectively, is disposed radially outside the inner cylinder and forms an air outlet cavity at intervals with the inner cylinder for communicating the return air cavity and the return air passage; wherein The internal fan is arranged in the air inlet cavity along the axial direction of the cylinder, and is used to guide the fresh air flow from the fresh air inlet into the cylinder and then flow through the fresh air channel, the air inlet cavity and the fresh air cavity in sequence, and then be discharged through the fresh air outlet.

6. The fresh air system according to claim 5, characterized in that, The air duct assembly also includes: An external fan bracket has its two ends connected to the heat exchange assembly and the cylinder, respectively, and its interior is hollow, forming an exhaust cavity for connecting the return air duct and the return air outlet; wherein... The external fan is arranged in the exhaust cavity along the axial direction of the cylinder, and is used to guide the fresh air flow from the return air inlet into the housing, then flow through the return air cavity, the air outlet cavity and the return air channel in sequence, and is discharged through the return air outlet.

7. The fresh air system according to claim 2, characterized in that, The housing is a vertically extending rectangular structure, and the fresh air outlet and the return air inlet are respectively located on two opposite side walls of the housing.

8. The fresh air system according to claim 7, characterized in that, The fresh air chamber and the return air chamber are arranged horizontally at intervals within the housing.

9. The fresh air system according to claim 2, characterized in that, The panel assembly also includes: A first air damper, rotatably disposed within the fresh air chamber, is used to open or close the fresh air outlet; and The second damper is rotatably disposed within the return air cavity and is used to open or close the return air inlet.

10. The fresh air system according to claim 9, characterized in that, The panel assembly also includes: A first knob is rotatably mounted on the housing and drivenly connected to the first damper, for driving the first damper to rotate; and The second knob is rotatably mounted on the housing and is connected to the second damper for driving the second damper to rotate.

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