A heat exchange component, a fresh air device, and a fresh air air conditioner

Abstract

This invention provides a heat exchange component, a fresh air device, and a fresh air air conditioner. The heat exchange component forms multiple first heat exchange channel layers and multiple second heat exchange channel layers, which are alternately arranged along a first direction. Each first heat exchange channel layer includes multiple first heat exchange channels extending along a second direction. Each second heat exchange channel layer includes multiple second heat exchange channels, which have a spiral structure and whose axes are parallel to the first direction. A first fluid can flow through the first heat exchange channels and exchange heat with a second fluid flowing through the second heat exchange channels. The first fluid and the second fluid are fluids of the same type or different types with different temperatures. The structure of the first or second heat exchange channels is optimized, the heat exchange time between the first and second fluids is extended, the heat exchange area between the second and first fluids is expanded, the heat exchange efficiency and capacity utilization are improved, and the capacity loss of the first fluid is avoided.

Description

Technical Field

[0001] This invention belongs to the field of heat exchange technology, and particularly relates to a heat exchange component, a fresh air device, and a fresh air air conditioner. Background Technology

[0002] The heat exchanger consists of two staggered heat exchange channels. When the first and second fluids, at different temperatures, flow through their respective channels, heat exchange is achieved, resulting in high efficiency and widespread application in air handling equipment. However, in existing technologies, the heat exchanger's structural design is flawed, with short heat exchange channel lengths, leading to insufficient heat exchange between the first and second fluids and low efficiency. This results in energy waste and a reduced user experience. Summary of the Invention

[0003] In view of this, the present invention provides a heat exchange component, a fresh air device, and a fresh air air conditioner to solve the problems in the prior art, such as unreasonable structural design of the heat exchange component and short extension length of the heat exchange channel, which lead to insufficient heat exchange between the first fluid and the second fluid and waste of energy.

[0004] This invention provides a heat exchanger having a plurality of first heat exchange channel layers and a plurality of second heat exchange channel layers, wherein the first heat exchange channel layers and the second heat exchange channel layers are arranged alternately; each first heat exchange channel layer includes at least one first heat exchange channel, and each second heat exchange channel layer includes at least one second heat exchange channel; the first heat exchange channel or the second heat exchange channel has a spiral structure.

[0005] The first fluid can flow through the first heat exchange channel and exchange heat with the second fluid flowing through the second heat exchange channel; wherein the first fluid and the second fluid are the same type of fluid or different types of fluid at different temperatures.

[0006] Further optionally, the first heat exchange channel layer and the second heat exchange channel layer are arranged alternately along the first direction, the first heat exchange channel extends along the second direction; the second heat exchange channel has a spiral structure, and the axis of the second heat exchange channel is parallel to the first direction;

[0007] The second direction is perpendicular to the first direction.

[0008] Further optionally, the heat exchange component also forms an inlet channel and an outlet channel, both of which extend along the first direction; the inlet channel is connected to the corresponding second heat exchange channel through a plurality of inlet connecting ports, and the outlet channel is connected to the corresponding second heat exchange channel through a plurality of outlet connecting ports;

[0009] The second fluid can enter the corresponding second heat exchange channel through the inlet channel and the corresponding inlet port, and then be discharged after entering the outlet channel through the corresponding outlet port.

[0010] Further optionally, the heat exchange component further includes wall A and wall B, which are disposed opposite to each other along the first direction; the second fluid on the wall A side can flow to the wall B side through the inlet channel, the second heat exchange channel and the outlet channel;

[0011] The inflow channel is close to the axis of the second heat exchange channel, and the outflow channel is far from the axis of the second heat exchange channel.

[0012] Further optionally, each second heat exchange channel layer includes a plurality of second heat exchange channels and the plurality of second heat exchange channels are arranged sequentially from the inside to the outside along the radial direction of the flow channel;

[0013] The structure of each second heat exchange channel is adapted to the structure of the cross-section of the heat exchange element along the second direction.

[0014] Further optionally, each of the second heat exchange channels includes an inner radial section, a circumferential section, and an outer radial section connected in sequence; the inner radial section is close to the axis of the second heat exchange channel and the plurality of inner radial sections are arranged at circumferential intervals along the flow channel; the outer radial section is away from the axis of the second heat exchange channel and the plurality of outer radial sections are arranged in parallel.

[0015] Further optionally, the heat exchanger further includes a wall surface C and a wall surface D, which are disposed opposite to each other along the second direction; the first fluid on the wall surface C side can flow to the wall surface D side through the first heat exchange channel;

[0016] Each first heat exchange layer includes two first heat exchange channel groups, the two first heat exchange channel groups are spaced apart along a third direction and the flow channel is formed between the two first heat exchange channel groups; each first heat exchange channel group includes a plurality of first heat exchange channels, the plurality of first heat exchange channels are spaced apart along the third direction.

[0017] Wherein, the third direction is perpendicular to the first direction and the third direction is perpendicular to the second direction.

[0018] The present invention also provides a fresh air device, comprising a fresh air component, a stale air component, a base, and a heat exchanger as described in any one of the above claims; the fresh air component forms a fresh air cavity, and the stale air component forms a stale air cavity; the base includes a base body, and the base body forms a base air duct; the air inlet end of the base air duct is connected to the outside, and the air outlet end of the base air duct is connected to the interior through the fresh air cavity; outdoor fresh air can enter the interior through the base air duct and the fresh air cavity;

[0019] The heat exchange component is installed in the base air duct. The air inlet of the first heat exchange duct is connected to the outside, and the air outlet of the first heat exchange duct is connected to the turbid air cavity. The indoor turbid air can be discharged to the outside through the first heat exchange duct and the turbid air cavity.

[0020] The air inlet end of the inlet channel and the air outlet end of the outlet channel are both connected to the base air duct; the fresh air in the base air duct can flow through the inlet channel, the second heat exchange channel and the outlet channel, and then be discharged into the room through the fresh air cavity; the fresh air flowing through the second heat exchange channel can exchange heat with the turbid air flowing through the first heat exchange channel.

[0021] Optionally, the fresh air assembly and the stale air assembly are arranged side by side at the bottom of the base body; the fresh air assembly includes a fresh air volute and a fresh air volute cover, which are fastened together to form the fresh air cavity; a fresh air cavity inlet is formed at the top of the fresh air cavity, which connects the air outlet of the base air duct to the fresh air cavity; a fresh air cavity outlet is formed at the bottom of the fresh air cavity, which connects the fresh air cavity to the indoor environment;

[0022] The turbid air assembly includes a turbid air volute and a turbid air volute cover, which are fastened together to form the turbid air cavity; a turbid air cavity inlet is formed at the top of the turbid air cavity, and the turbid air cavity inlet connects the air outlet of the first heat exchange channel with the turbid air cavity; a turbid air cavity outlet is formed on the side of the turbid air cavity.

[0023] The base also includes a base plate, on which a fresh air inlet pipe and a stale air outlet pipe are provided. The fresh air inlet pipe connects the air inlet end of the base air duct to the outside, and the stale air outlet pipe connects the outlet of the stale air chamber to the outside, so that the stale air chamber is connected to the outside.

[0024] The present invention also provides a fresh air air conditioner, including an indoor unit, the indoor unit including an indoor unit body and a fresh air device as described in any of the above claims; the fresh air device is disposed on one side of the indoor unit body.

[0025] Compared with the prior art, the main advantages of the present invention are as follows:

[0026] (1) The heat exchange component is formed with a first heat exchange channel and a second heat exchange channel. At least one of the first heat exchange channel and the second heat exchange channel has a spiral structure. The first fluid can flow through the first heat exchange channel and complete heat exchange with the second fluid flowing through the second heat exchange channel. The structure of the first heat exchange channel or the second heat exchange channel is optimized, the heat exchange time of the first fluid and the second fluid is extended, and the heat exchange efficiency and capacity utilization are improved.

[0027] (2) The first heat exchange channel layer and the second heat exchange channel layer are arranged alternately along the first direction. The first heat exchange channel layer includes a plurality of first heat exchange channels arranged at intervals along the third direction and the first heat exchange channels extend along the second direction. The second heat exchange channel layer includes a plurality of second heat exchange channels. The second heat exchange channels have a spiral structure and the axis of the second heat exchange channels is parallel to the first direction. The second fluid can enter the corresponding second heat exchange channel through the inlet channel and the corresponding inlet port, and enter the outlet channel through the corresponding outlet port and be discharged. This increases the heat exchange area between the second fluid and the first fluid, so that the first fluid and the second fluid can fully exchange heat and avoid the loss of the first fluid's capacity.

[0028] (3) When heat exchange components are applied to fresh air devices, they improve the heat exchange efficiency between indoor stale air and outdoor fresh air, extend the heat exchange time between indoor stale air and outdoor fresh air, make full use of the energy of indoor stale air, avoid energy waste, expand the application range of fresh air devices, make the temperature of the fresh air introduced into the room similar to the indoor air temperature, and reduce the impact of outdoor fresh air on indoor air. Attached Figure Description

[0029] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0030] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0031] Figure 1 A schematic diagram of the axial structure of an embodiment of the heat exchanger provided by the present invention;

[0032] Figure 2a This is a top view schematic diagram of an embodiment of the heat exchanger provided by the present invention;

[0033] Figure 2b This is a schematic diagram of the main structure of an embodiment of the heat exchanger provided by the present invention;

[0034] Figure 2c This is a rear view structural diagram of an embodiment of the heat exchanger provided by the present invention;

[0035] Figure 3a for Figure 2a Sectional view at point AA;

[0036] Figure 3b for Figure 2b Sectional view at point BB;

[0037] Figure 3c for Figure 2b Sectional view at CC;

[0038] Figure 4 This is a schematic diagram of an embodiment of the fresh air device (without a face mask) provided by the present invention;

[0039] Figure 5 This is an exploded structural diagram of an embodiment of the fresh air device provided by the present invention;

[0040] Figure 6a This is an exploded structural diagram of an embodiment of the fresh air component provided by the present invention;

[0041] Figure 6b This is an exploded structural diagram of an embodiment of the turbid air component provided by the present invention;

[0042] Figure 7 A schematic diagram of the base embodiment provided by the present invention;

[0043] Figure 8 This is a schematic diagram of the structure of an indoor unit embodiment provided by the present invention;

[0044] In the picture:

[0045] 1-Base; 11-Base body; 111-Filter installation position; 112-Heat exchange component installation position; 12-Base plate; 131-Fresh air inlet duct; 132-Stale air exhaust duct;

[0046] 2-Heat exchange component; 21-First heat exchange channel layer; 211-First heat exchange channel; 22-Second heat exchange channel layer; 221-Second heat exchange channel; 222-Inner radial section; 223-Circumferential section; 224-Outer radial section; 23-Flow inlet channel; 24-Flow outlet channel; 251-Wall surface A; 252-Wall surface B; 253-Wall surface C; 254-Wall surface D; 261-First direction; 262-Second direction; 263-Third direction;

[0047] 31-Fresh air assembly; 311-Fresh air volute; 312-Fresh air volute cover; 313-Fresh air fan blade; 32-Dull air assembly; 321-Dull air volute; 322-Dull air volute cover; 323-Dull air fan blade; 33-Fan blade motor; 331-First shaft end; 332-Second shaft end; 34-Fresh air electrical box

[0048] 41-Face mask; 42-Filter screen; 43-Wall mounting panel;

[0049] 5-Fresh air unit; 6-Indoor unit body. Detailed Implementation

[0050] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0052] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0053] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0054] The existing heat exchange components have an unreasonable structural design, with short heat exchange channel extension length, insufficient heat exchange between the first and second fluids, and low heat exchange efficiency, resulting in energy waste and reduced user experience.

[0055] This invention creatively provides a heat exchanger having multiple first heat exchange channel layers and multiple second heat exchange channel layers, with the first and second heat exchange channel layers alternating. Each first heat exchange channel layer includes at least one first heat exchange channel, and each second heat exchange channel layer includes at least one second heat exchange channel. At least one of the first and second heat exchange channels has a spiral structure. A first fluid can flow through the first heat exchange channel and exchange heat with a second fluid flowing through the second heat exchange channel. The first and second fluids are either the same type of fluid or different types of fluids at different temperatures.

[0056] The structure of the first or second heat exchange channel was optimized, the heat exchange time between the first and second fluids was extended, and the heat exchange efficiency and capacity utilization were improved.

[0057] <Heat exchange components>

[0058] like Figures 1 to 3c As shown, this embodiment provides a heat exchanger 2, which has multiple first heat exchange channel layers 21 and multiple second heat exchange channel layers 22. The first heat exchange channel layers 21 and the second heat exchange channel layers 22 are arranged alternately along a first direction 261. Each first heat exchange channel layer 21 includes multiple first heat exchange channels 211, which extend along a second direction 262. Each second heat exchange channel layer 22 includes multiple second heat exchange channels 221, at least one of which has a spiral structure, and the axis of the second heat exchange channel 221 is parallel to the first direction 261. The second direction 262 is perpendicular to the first direction 261. In this embodiment, the heat exchanger 2 includes seven first heat exchange channel layers 21 and seven second heat exchange channel layers 22.

[0059] The first fluid can flow through the first heat exchange channel 211 and exchange heat with the second fluid flowing through the second heat exchange channel 221; wherein, the first fluid and the second fluid are the same type of fluid or different types of fluid at different temperatures;

[0060] The structure of the first heat exchange channel 211 or the second heat exchange channel 221 has been optimized, which has extended the heat exchange time between the first fluid and the second fluid, expanded the heat exchange area between the second fluid and the first fluid, enabled the first fluid and the second fluid to fully exchange heat, improved the heat exchange efficiency and capacity utilization, and avoided the capacity loss of the first fluid.

[0061] To address the issue of poor flow of the second fluid through the second heat exchange channel 221, this embodiment proposes that the heat exchange component 2 further includes an inlet channel 23 and an outlet channel 24, both extending along the first direction 261. The inlet channel 23 is connected to the corresponding second heat exchange channel 221 through multiple inlet ports, and the outlet channel 24 is connected to the corresponding second heat exchange channel 221 through multiple outlet ports.

[0062] The second fluid can enter the corresponding second heat exchange channel 221 through the inlet channel 23 and the corresponding inlet port, and then be discharged after flowing into the outlet channel 24 through the corresponding outlet port.

[0063] Specifically, the heat exchanger 2 also includes wall surface A 251 and wall surface B 252, which are arranged opposite to each other along the first direction 261; the second fluid on the wall surface A 251 side can flow to the wall surface B 252 side through the inlet channel 23, the second heat exchange channel 221 and the outlet channel 24; the inlet channel 23 is close to the axis of the second heat exchange channel 221 and the outlet channel 24 is away from the axis of the second heat exchange channel 221.

[0064] In response to the problem that the heat exchange area between the second fluid and the first fluid is small due to the unreasonable structural design of the second heat exchange channel 221, this embodiment proposes that each second heat exchange channel layer 22 includes multiple second heat exchange channels 221 and the multiple second heat exchange channels 221 are arranged sequentially from the inside to the outside along the radial direction of the flow channel 23.

[0065] The structure of each second heat exchange channel 221 is adapted to the structure of the cross-section of the heat exchange component 2 along the second direction 262; the extension length of the second heat exchange channel 221 is extended, further expanding the heat exchange area between the first fluid and the second fluid, and improving the heat exchange efficiency between the first fluid and the second fluid.

[0066] Specifically, each second heat exchange channel 221 includes an inner radial section 222, a circumferential section 223, and an outer radial section 224 connected in sequence; the inner radial section 222 is close to the axis of the second heat exchange channel 221 and multiple inner radial sections 222 are arranged circumferentially at intervals along the inlet channel 23; the outer radial section 224 is away from the axis of the second heat exchange channel 221 and multiple outer radial sections 224 are arranged in parallel; the circumferential section 223 has a broken line structure and multiple circumferential sections 223 are arranged at intervals along a third direction 263; wherein, the third direction 263 is perpendicular to the first direction 261 and the third direction 263 is perpendicular to the second direction 262.

[0067] To address the problem of a small heat exchange area between the second fluid and the first fluid due to an unreasonable structural design of the first heat exchange channel 211, this embodiment proposes that the heat exchange component 2 further includes a wall surface C 253 and a wall surface D 254, which are arranged opposite to each other along the second direction 262; the first fluid on the wall surface C 253 side can flow to the wall surface D 254 side through the first heat exchange channel 211;

[0068] Each first heat exchange layer includes two first heat exchange channel groups, which are spaced apart along a third direction 263 and a flow channel 23 is formed between the two first heat exchange channel groups; each first heat exchange channel group includes multiple first heat exchange channels 211, which are spaced apart along a third direction 263.

[0069] <Fresh Air Units and Fresh Air Conditioners>

[0070] like Figure 4 and Figure 8As shown, this embodiment also proposes a fresh air device 5, including a fresh air component 31, a stale air component 32, a base 1, and a heat exchanger 2 of any of the above. The fresh air component 31 forms a fresh air cavity, and the stale air component 32 forms a stale air cavity. The base 1 includes a base body 11, which is a box structure and has a base air duct. The air inlet of the base air duct is connected to the outside through the fresh air cavity, and the air outlet of the base air duct is connected to the inside. Outdoor fresh air can enter the room through the base air duct and the fresh air cavity.

[0071] A heat exchanger 2 is installed in the base air duct. The air inlet of the first heat exchange duct 211 is connected to the outside, and the air outlet of the first heat exchange duct 211 is connected to the turbid air cavity. The indoor turbid air can be discharged to the outside through the first heat exchange duct 211 and the turbid air cavity.

[0072] The air inlet end of the inlet channel 23 and the air outlet end of the outlet channel 24 are both connected to the base air duct; the fresh air in the base air duct can flow through the inlet channel 23, the second heat exchange channel 221 and the outlet channel 24, and then be discharged into the room through the fresh air chamber; the fresh air flowing through the second heat exchange channel 221 can exchange heat with the turbid air flowing through the first heat exchange channel 211.

[0073] This improves the heat exchange efficiency between indoor stale air and outdoor fresh air, extends the heat exchange time between indoor stale air and outdoor fresh air, makes full use of the energy of indoor stale air, avoids energy waste, expands the application range of fresh air device 5, makes the temperature of the fresh air introduced into the room similar to the indoor air temperature, and reduces the impact of outdoor fresh air on indoor air.

[0074] Furthermore, the fresh air assembly 31 and the stale air assembly 32 are arranged side by side at the bottom of the base body 11; the fresh air assembly 31 includes a fresh air volute 311 and a fresh air volute cover 312, which are fastened together to form a fresh air cavity; a fresh air cavity inlet is formed at the top of the fresh air cavity, which connects the air outlet of the base air duct to the fresh air cavity; a fresh air cavity outlet is formed at the bottom of the fresh air cavity, which connects the fresh air cavity to the room.

[0075] The turbid air assembly 32 includes a turbid air volute 321 and a turbid air volute cover 322, which are fastened together to form a turbid air cavity; a turbid air cavity inlet is formed at the top of the turbid air cavity, which connects the air outlet of the first heat exchange channel 211 with the turbid air cavity; a turbid air cavity outlet is formed on the side of the turbid air cavity.

[0076] The base 1 also includes a base plate 12, on which a fresh air inlet pipe 131 and a stale air exhaust pipe 132 are provided. The fresh air inlet pipe 131 connects the air inlet end of the base air duct to the outside, and the stale air exhaust pipe 132 connects the stale air cavity outlet to the outside, so that the stale air cavity is connected to the outside.

[0077] Specifically, the fresh air device 5 also includes a filter; the filter is a HEPA filter; the base air duct has a filter mounting position 111 and a heat exchanger mounting position 112 sequentially formed along the fresh air flow direction, the filter is installed at the filter mounting position 111, and the heat exchanger 2 is installed at the heat exchanger mounting position 112; the fresh air assembly 31 also includes a fresh air fan blade 313, which is rotatably installed in the fresh air cavity; the stale air assembly 32 also includes a stale air fan blade 323, which is rotatably installed in the stale air cavity; the fan motor 33 is located between the fresh air assembly 31 and the stale air assembly 32, and the output shaft of the fan motor 33 includes a first shaft end 331 and a second shaft end 332; the first shaft end 331 is driven to be connected to the fresh air fan blade 313, and the second shaft end 332 is driven to be connected to the stale air fan blade 323;

[0078] The fresh air device 5 also includes a fresh air electrical box 34, which contains a fresh air control board. The fresh air control board is electrically connected to the fan motor 33. The fresh air control board controls the operation of the fan motor 33, causing the fresh air fan blade 313 and the stale air fan blade 323 to rotate, thereby introducing fresh outdoor air into the room and expelling stale indoor air to the outside.

[0079] The fresh air device 5 also includes a mask 41, and the base 1, fresh air component 31, stale air component 32 and fan motor 33 are all installed inside the mask 41. The base body 11 has a slot on the side wall near the base plate 12. The slot is used to install the base plate 12 on the wall-mounted plate 43, so that the base plate 12 can be installed on the wall.

[0080] This embodiment also proposes a fresh air conditioner, including an indoor unit, which includes an indoor unit body 6 and a fresh air device 5 as described above; the fresh air device 5 is disposed on one side of the indoor unit body 6.

[0081] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A heat exchange component, characterized in that, The heat exchanger has multiple first heat exchange channel layers and multiple second heat exchange channel layers, which are alternately arranged along a first direction; each first heat exchange channel layer includes at least one first heat exchange channel, which extends along a second direction; each second heat exchange channel layer includes at least one second heat exchange channel, which has a spiral structure and whose axis is parallel to the first direction; wherein the second direction is perpendicular to the first direction. The heat exchanger also has an inlet channel and an outlet channel, both of which extend along the first direction. The inlet channel is connected to the corresponding second heat exchange channel through multiple inlet ports, and the outlet channel is connected to the corresponding second heat exchange channel through multiple outlet ports. The second fluid can enter the corresponding second heat exchange channel through the inlet channel and the corresponding inlet ports, and then exit through the outlet channel after entering the outlet channel through the corresponding outlet ports. The first fluid can flow through the first heat exchange channel and exchange heat with the second fluid flowing through the second heat exchange channel; wherein the first fluid and the second fluid are the same type of fluid or different types of fluid at different temperatures.

2. The heat exchanger according to claim 1, characterized in that, The heat exchanger further includes wall surface A and wall surface B, which are arranged opposite to each other along the first direction; the second fluid on the wall surface A side can flow to the wall surface B side through the inlet channel, the second heat exchange channel and the outlet channel; The inflow channel is close to the axis of the second heat exchange channel, and the outflow channel is far from the axis of the second heat exchange channel.

3. The heat exchanger according to claim 1, characterized in that, Each second heat exchange channel layer includes multiple second heat exchange channels, and the multiple second heat exchange channels are arranged sequentially from the inside to the outside along the radial direction of the flow channel; The structure of each second heat exchange channel is adapted to the structure of the cross-section of the heat exchange element along the second direction.

4. The heat exchanger according to claim 3, characterized in that, Each of the second heat exchange channels includes an inner radial section, a circumferential section, and an outer radial section connected in sequence; the inner radial section is close to the axis of the second heat exchange channel and the plurality of inner radial sections are arranged at circumferential intervals along the flow channel; the outer radial section is away from the axis of the second heat exchange channel and the plurality of outer radial sections are arranged in parallel.

5. The heat exchanger according to claim 1, characterized in that, The heat exchanger further includes a wall surface C and a wall surface D, which are arranged opposite to each other along the second direction; the first fluid on the wall surface C side can flow to the wall surface D side through the first heat exchange channel; Each first heat exchange channel layer includes two first heat exchange channel groups, the two first heat exchange channel groups are spaced apart along a third direction and the flow channel is formed between the two first heat exchange channel groups; each first heat exchange channel group includes multiple first heat exchange channels, the multiple first heat exchange channels are spaced apart along the third direction. Wherein, the third direction is perpendicular to the first direction and the third direction is perpendicular to the second direction.

6. A fresh air device, characterized in that, The fresh air device includes a fresh air component, a stale air component, a base, and a heat exchanger as described in any one of claims 1-5; the fresh air component forms a fresh air cavity, and the stale air component forms a stale air cavity; the base includes a base body, and the base body forms a base air duct; the air inlet end of the base air duct is connected to the outside, and the air outlet end of the base air duct is connected to the interior through the fresh air cavity; outdoor fresh air can enter the interior through the base air duct and the fresh air cavity; The heat exchange component is installed inside the base air duct. The air inlet of the first heat exchange duct is connected to the outside, and the air outlet of the first heat exchange duct is connected to the turbid air cavity. Indoor turbid air can be discharged to the outside through the first heat exchange duct and the turbid air cavity. The air inlet end of the inlet channel and the air outlet end of the outlet channel are both connected to the base air duct; the fresh air in the base air duct can flow through the inlet channel, the second heat exchange channel and the outlet channel, and then be discharged into the room through the fresh air cavity; the fresh air flowing through the second heat exchange channel can exchange heat with the turbid air flowing through the first heat exchange channel.

7. The fresh air device according to claim 6, characterized in that, The fresh air assembly and the stale air assembly are arranged side by side at the bottom of the base body; the fresh air assembly includes a fresh air volute and a fresh air volute cover, which are fastened together to form the fresh air cavity; a fresh air cavity inlet is formed at the top of the fresh air cavity, which connects the air outlet of the base air duct to the fresh air cavity; a fresh air cavity outlet is formed at the bottom of the fresh air cavity, which connects the fresh air cavity to the indoor environment; The turbid air assembly includes a turbid air volute and a turbid air volute cover, which are fastened together to form the turbid air cavity; a turbid air cavity inlet is formed at the top of the turbid air cavity, and the turbid air cavity inlet connects the air outlet of the first heat exchange channel with the turbid air cavity; a turbid air cavity outlet is formed on the side of the turbid air cavity. The base also includes a base plate, on which a fresh air inlet pipe and a stale air outlet pipe are provided. The fresh air inlet pipe connects the air inlet end of the base air duct to the outside, and the stale air outlet pipe connects the outlet of the stale air chamber to the outside, so that the stale air chamber is connected to the outside.

8. A fresh air conditioning system, characterized in that, The fresh air conditioner includes an indoor unit, which includes an indoor unit body and a fresh air device as described in any one of claims 6-7; the fresh air device is disposed on one side of the indoor unit body.

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