Fresh air module and constant-temperature fresh air purification system

Abstract

The utility model relates to the technical field of fresh air devices, and discloses a fresh air module and a constant temperature fresh air purification system.The fresh air module comprises a box body, an air guide plate part, a top cover covering the box body and a cover plate located in the middle of the box body, a first air channel is formed in the upper surface of the cover plate, a centrifugal fan is rotationally arranged below the cover plate, and a second air channel is formed in the periphery of the centrifugal fan; the centrifugal fan rotates to introduce air in the first air duct into the second air duct; a first side wall and a second side wall are oppositely arranged on the box body, a fresh air inlet is formed in the first side wall, an internal circulation air inlet is formed above the fresh air inlet, a third air duct communicated with the fresh air inlet and the internal circulation air inlet is further included, a fresh air outlet is formed in the second side wall, an exhaust air inlet is formed in the top cover, and an exhaust air outlet is formed in the top cover. The fresh air module can achieve multiple functions and is small in size.

Description

Technical Field

[0001] This utility model relates to the field of fresh air device technology, specifically to a constant temperature fresh air purification system. Background Technology

[0002] A fresh air system is an effective air purification device that enables indoor air circulation. Currently, ducted air conditioning modules with fresh air functions on the market mainly fall into two categories: one type directly introduces outdoor fresh air into the room without passing through the ducted air conditioning unit's heat exchanger, while also having an exhaust function. Although it has both intake and exhaust functions, the fresh air cannot achieve constant temperature fresh air because it doesn't pass through the heat exchanger. The other type directly introduces outdoor fresh air into the ducted air conditioning unit's return air vent, passing through the ducted air conditioning unit's heat exchanger, but it lacks an exhaust function and cannot achieve indoor-outdoor air exchange. In existing technologies, fresh air fans that can simultaneously introduce fresh air, exhaust air, and perform internal circulation, such as those described in patent publication number CN112413774A, generally have multiple dampers for control, are relatively large, and have multiple right-angle turns in the air path. These dampers are prone to hitting the air panels during air delivery, generating noise and causing airflow loss. Utility Model Content

[0003] This invention provides a fresh air module that can perform multiple functions while being small in size.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a fresh air module, comprising a box body, an air guide plate, a top cover covering the box body, and a cover plate located in the middle of the box body. The upper surface of the cover plate is provided with a first air duct, and a centrifugal fan is rotatably provided below the cover plate. A second air duct is provided around the centrifugal fan. The rotation of the centrifugal fan can introduce the air in the first air duct into the second air duct. The box body is provided with a first side wall and a second side wall arranged opposite to each other. A fresh air inlet is provided on the first side wall, and an internal circulation inlet is provided above the fresh air inlet. The module also includes a third air duct that is connected to both the fresh air inlet and the internal circulation inlet. A fresh air outlet is provided on the second side wall, and an exhaust air inlet is provided on the top cover.

[0005] The air guide plate includes a first air plate, a second air plate, and a third air plate. Each of the first, second, and third air plates is equipped with a rotating mechanism, which drives the first, second, and third air plates to rotate. The first air plate can rotate to switch the third air duct to be connected only to the fresh air inlet or only to the internal circulation air inlet; the second air plate can rotate to switch the second air duct to be connected only to the fresh air outlet or only to the third air duct; and the third air plate can rotate to switch to be connected only to the first and third air ducts or only to the exhaust air inlet.

[0006] The beneficial effects of this plan are:

[0007] 1. Functional integration

[0008] This technical solution, by setting up a rotating first, second, and third air vane and multiple air ducts, can simultaneously achieve three modes: fresh air introduction, exhaust air, and internal circulation. When introducing fresh air from outdoors, the first air vane rotates, connecting the third air duct to the fresh air inlet; the second air vane rotates, connecting the second air duct to the fresh air outlet; and the third air vane rotates, connecting the first and third air ducts. After the centrifugal fan is turned on, outdoor air enters through the fresh air inlet, passes through the third air duct into the first air duct, enters the second air duct under the action of the centrifugal fan, and is then exhausted from the fresh air outlet, thus introducing fresh air. In internal circulation mode, rotating the first air vane connects the third air duct to the internal circulation inlet; rotating the second air vane connects the second air duct to the fresh air outlet; and rotating the third air vane connects the first and third air ducts. After the centrifugal fan is turned on, internally circulated air enters through the internal circulation inlet and flows out from the fresh air outlet. In exhaust mode, rotating the first air vane connects the third air duct to the fresh air inlet. Rotating the second air vane connects the second air duct to the third air duct. Rotating the third air vane connects the first air duct to the third air duct. The air to be exhausted enters the first air duct through the exhaust air inlet, enters the second air duct under the action of the centrifugal fan, and then exits through the fresh air inlet via the second and third air ducts.

[0009] This invention utilizes a three-rotatable air vane combined with a multi-duct structure to achieve three operating modes: fresh air introduction, exhaust, and internal circulation. When switching between modes, simply rotating the corresponding air vane changes the airflow direction. This design makes the system more flexible and efficient, while reducing the hardware requirements and maintenance costs of the control system.

[0010] 2. Small size and low cost

[0011] In this technical solution, the air duct structure is a double-layer structure, with the centrifugal fan located below the cover plate, simultaneously connecting the first and second air ducts. This significantly improves space utilization and air duct efficiency, resulting in a marked reduction in overall unit size. It achieves a compact arrangement of the upper and lower airflow channels, meeting the dual requirements of efficient ventilation and space efficiency. This technical solution uses a single centrifugal fan to perform multiple functions such as introducing fresh air, exhausting air, and internal circulation. Sharing a single centrifugal fan not only reduces hardware costs but also energy consumption and maintenance workload. This technical solution requires only three air deflectors for path switching, while conventional solutions require four to five damper assemblies. More air deflector assemblies often lead to higher costs; this technical solution reduces some of these costs.

[0012] As an improvement, a shielding rib is provided at the bottom of the box. The shielding rib is arranged around the centrifugal fan. There is a gap between the shielding rib and the centrifugal fan, and a second air duct is formed through the gap. An exhaust channel is also formed between the shielding rib and the inner wall of the box. The second air duct can be connected to the third air duct through the exhaust channel.

[0013] The beneficial effects are as follows: the shielding ribs surround the centrifugal fan and form a second air duct through the gap with the outer periphery of the fan, which can achieve more precise airflow guidance, while also dispersing airflow pressure, reducing airflow turbulence and noise, and optimizing the overall fan performance.

[0014] As an improvement, the fresh air module also includes a filter assembly. The top cover has a filter installation port for inserting the filter assembly. The filter assembly is detachably connected to the top cover and is located at the inlet end of the first air duct.

[0015] The beneficial effects are as follows: The filter assembly is located at the inlet of the first air duct, ensuring that the air entering the fresh air module and the recirculated air are filtered first, effectively removing particulate matter, dust, and harmful substances from the air. This ensures that the system introduces clean air, thereby improving air quality and protecting user health. The filter installation port is located on the surface of the top cover, and the filter assembly is detachably connected to the top cover. Users can directly remove or insert the filter assembly from the top, reducing system maintenance time and lowering operational difficulty and maintenance costs.

[0016] As an improvement, the rotating mechanism also includes multiple stepper motors fixed inside the housing. Each stepper motor includes a rotating shaft. The first air plate, the second air plate, and the third air plate are each connected to the rotating shaft of a stepper motor. The rotating mechanism can drive the first air plate, the second air plate, and the third air plate to the first state and the second state, respectively.

[0017] The beneficial effects are as follows: each air vane is driven to rotate by its corresponding stepper motor. The stepper motor has high-resolution rotation angle control capability, which can accurately position the opening degree of the air vane, realize the smooth transition and fine adjustment of the air duct switching, and ensure the stability of the air duct opening and closing and the reliability of the system during long-term operation.

[0018] As an improvement, the stepper motor connected to the third air plate is a third stepper motor. The internal circulation air inlet and the filter installation port are arranged adjacent to each other, and the internal circulation air inlet is closer to the centrifugal fan. The shaft of the third stepper motor is set between the internal circulation air inlet and the filter installation port. The rotation of the shaft of the third stepper motor drives the third air plate to rotate to block the internal circulation air inlet or block the inlet end of the first air duct.

[0019] The beneficial effects are as follows: The third stepper motor is installed between the internal circulation air inlet and the filter installation port. Its shaft is connected to the third air deflector to achieve bidirectional switching function, that is, to block the internal circulation air inlet or to block the inlet end of the first air duct. The third stepper motor precisely drives the third air deflector, which can quickly switch the fresh air mode according to the operating mode. The shaft of the third stepper motor is set between the internal circulation air inlet and the filter installation port, and the filter installation port is further away from the centrifugal fan. In this way, in the exhaust mode, the air that needs to be exhausted does not need to pass through the filter assembly, while only the air inlet passes through the filter assembly, reducing the wear of the filter assembly.

[0020] As an improvement, the stepper motor connected to the second air plate is the second stepper motor. The second air plate rotates under the drive of the second stepper motor to switch the second air duct to connect with the fresh air outlet or with the exhaust air duct (17).

[0021] The beneficial effects are as follows: In fresh air mode, the second air plate switches to connect the second air duct and the fresh air outlet, ensuring that the fresh air after purification and heat exchange is smoothly delivered to the room; in exhaust mode, the second air plate rotates to connect the second air duct and the third air duct, guiding the air from the exhaust duct to the outside, realizing multiple modes simultaneously with a single centrifugal fan, reducing structural complexity and manufacturing costs.

[0022] As an improvement, the stepper motor connected to the first air deflector is the first stepper motor. The first air deflector, driven by the rotating shaft, blocks the internal circulation air inlet or the fresh air inlet.

[0023] As an improvement, the cover plate is provided with air holes opposite to the centrifugal fan. A guide plate is fixed on the cover plate and forms a first air duct through the guide plate. The guide plate includes an arc plate and a straight baffle plate connected to both ends of the arc plate for guiding the air direction. The arc plate is arranged around the air holes.

[0024] The beneficial effects are as follows: by combining the arc plate and the straight wind deflector, the airflow is guided to the first air duct, improving the flow efficiency of the airflow. The arc plate surrounds the outside of the air hole, optimizing the airflow path, reducing airflow turbulence and energy loss. The arc plate can effectively reduce the airflow resistance around the air hole, while reducing the noise caused by airflow impact.

[0025] As an improvement, the top surface of the air guide plate is attached to the lower surface of the top cover.

[0026] The beneficial effects are: the top surface of the air guide plate fits snugly against the lower surface of the top cover, effectively preventing airflow leakage from the top of the air guide plate. This further improves the sealing of the air duct, ensuring that the airflow flows exactly along the designed path, thereby enhancing the operational stability of the system.

[0027] The constant temperature fresh air purification system includes any of the above-mentioned fresh air modules, and also includes a duct air conditioner, with the fresh air outlet connected to the inlet end of the duct air conditioner. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an embodiment of the present utility model.

[0029] Figure 2 This is an exploded view of the fresh air module according to an embodiment of the present utility model.

[0030] Figure 3 This is a schematic diagram of the air vent of the fresh air module in the fresh air mode according to an embodiment of this utility model.

[0031] Figure 4 This is a schematic diagram of the air vents in the exhaust mode of the fresh air module according to an embodiment of this utility model.

[0032] Reference numerals in the attached drawings: 1. Box body; 2. Top cover; 3. Cover plate; 4. First air duct; 5. Centrifugal fan; 6. Second air duct; 7. Fresh air inlet; 8. Internal circulation air inlet; 9. Third air duct; 10. Fresh air outlet; 11. Exhaust air inlet; 12. Ductwork unit; 13. First air deflector; 14. Second air deflector; 15. Third air deflector; 16. Shielding rib; 17. Exhaust air passage; 18. Filter assembly; 19. Arc plate; 20. Straight wind deflector; 21. Fresh air motor; 22. Fan blade; 23. Rectangular hole; 24. Filter mounting port. Detailed Implementation

[0033] The present invention will be further described in detail below through specific embodiments and examples.

[0034] Preferred embodiments of this utility model are shown in the appendix. Figures 1-4 As shown. Figure 1 and Figure 2 The diagram shows a fresh air module and a constant-temperature fresh air purification system. The constant-temperature fresh air purification system includes a fresh air module and a ducted air conditioner 12. The fresh air module includes a housing 1, an air guide plate, a top cover 2 covering the housing 1, and a cover plate 3 located in the middle of the housing 1. A first air duct 4 is provided on the upper surface of the cover plate 3, and a centrifugal fan 5 is rotatably mounted below the cover plate 3. A second air duct 6 is provided around the centrifugal fan 5. The rotation of the centrifugal fan 5 can introduce air from the first air duct 4 into the second air duct 6. The housing 1 has a first side wall and a second side wall arranged opposite each other. A fresh air inlet 7 is provided on the first side wall, and an internal circulation air inlet 8 is provided above the fresh air inlet 7. The fresh air module also includes a third air duct 9 communicating with the fresh air inlet 7 and the internal circulation air inlet 8. The communication method can be various, such as duct connection. Specifically, in this invention, the cover plate 3 has a rectangular hole 23 near the fresh air inlet 7, which connects the upper and lower parts of the cover plate 3. The area of ​​the box 1 corresponding to the rectangular hole 23 is the third air duct 9. A fresh air outlet 10 is also provided on the second side wall, and an exhaust air inlet 11 is provided on the top cover 2. The fresh air outlet 10 is connected to the inlet end of the duct unit 12.

[0035] The air guide plate section includes a first air plate 13, a second air plate 14, and a third air plate 15 that are rotatably configured. Each of the three air plates is equipped with a rotating mechanism, which drives them to rotate. The first air plate 13 can rotate to switch the third air duct 9 to connect only to the fresh air inlet 7 or only to the internal circulation air inlet 8; the second air plate 14 can rotate to switch the second air duct 6 to connect only to the fresh air outlet 10 or only to the third air duct 9; and the third air plate 15 can rotate to switch the first air duct 4 to connect only to the third air duct 9 or only to the exhaust air inlet 11. The duct unit 12 has an internal heat exchanger for adjusting the temperature of the incoming fresh air to achieve constant temperature fresh air.

[0036] To ensure a simple, reliable, and easy-to-assemble structure, the preferred embodiment of this invention features a spiral-shaped shielding rib 16 at the bottom of the housing 1. The upper surface of the shielding rib 16 is in contact with the lower surface of the cover plate 3. The shielding rib 16 surrounds the centrifugal fan 5, with a gap between the shielding rib 16 and the centrifugal fan 5, forming a second air duct 6. An exhaust channel 17 is also formed between the shielding rib 16 and the inner wall of the housing. The second air duct 6 can also connect with a third air duct 9 through the exhaust channel 17. The shielding rib 16 surrounds the centrifugal fan 5, forming a second air duct 6 through the gap with the outer periphery of the fan, achieving more precise airflow guidance. At the same time, the spiral shape can disperse airflow pressure, reduce airflow turbulence and noise, and optimize the overall fan performance.

[0037] To ensure a simple, reliable, and easy-to-assemble structure, the preferred embodiment of this invention further includes a filter assembly 18. The top cover 2 has a filter mounting port 24 on its upper surface for inserting the filter assembly 18. The filter assembly 18 is detachably connected to the top cover 2 and is positioned at the inlet end of the first air duct 4. The detachable connection can take various forms, such as magnetic fixing or snap-fit. In this technical solution, it is sufficient to insert the filter assembly 18 through the filter mounting port 24 and fix it at the inlet end of the first air duct 4. The filter assembly 18, positioned at the inlet end of the first air duct 4, ensures that the air entering the fresh air module and the recirculated air are filtered first, effectively removing particulate matter, dust, and harmful substances from the air, ensuring that the system introduces clean air, thereby improving air quality and protecting user health. The filter mounting port 24 is located on the surface of the top cover 2, and the filter assembly 18 is detachably connected to the top cover 2. Users can directly remove or insert the filter assembly 18 from the top, reducing system maintenance time and lowering operational difficulty and maintenance costs.

[0038] The rotating air deflector can take various forms, such as using limiting components to restrict its rotation angle. To ensure a simple, reliable, and easy-to-assemble structure, the preferred embodiment of this invention includes a rotating mechanism comprising multiple stepper motors fixed within the housing 1. Each stepper motor includes a rotating shaft. The first air deflector 13, the second air deflector 14, and the third air deflector 15 are each connected to the rotating shaft of a stepper motor. In this invention, each stepper motor has a first state and a second state, meaning the stepper motor can rotate the air deflector by a certain angle so that the corresponding air deflector is in either the first or second state. Each air deflector in the air guide section is driven to rotate by its corresponding stepper motor. The stepper motor has high-resolution angle control capability, accurately positioning the air deflector opening, achieving smooth transitions and fine adjustments during air duct switching, and ensuring the stability of air duct opening and closing and system reliability during long-term operation.

[0039] To ensure a simple, reliable, and easy-to-assemble structure, the preferred embodiment of this invention uses a third stepper motor connected to the third air plate 15. In this technical solution, the internal circulation air inlet 8 and the filter installation port 24 are arranged adjacent to each other, with the internal circulation air inlet 8 closer to the centrifugal fan 5. The shaft of the third stepper motor is located between the internal circulation air inlet 8 and the filter installation port 24. The first state of the third stepper motor is that the third air plate 15 rotates to cover the internal circulation air inlet 8, and the second state is that the third air plate 15 rotates to cover the inlet end of the first air duct 4. Through the above arrangement, the rotation of the shaft of the third stepper motor drives the third air plate 15 to rotate to cover the internal circulation air inlet 8 or the inlet end of the first air duct 4. The third stepper motor is installed between the internal circulation air inlet 8 and the filter installation port 24. Its shaft is connected to the third air deflector 15 to achieve bidirectional switching function, that is, to block the internal circulation air inlet 8 or to block the inlet end of the first air duct 4. The third stepper motor precisely drives the third air deflector 15, which can quickly switch the fresh air mode according to the operating mode. The shaft of the third stepper motor is set between the internal circulation air inlet 8 and the filter installation port 24, and the filter installation port 24 is further away from the centrifugal fan 5. In this way, in the exhaust mode, the air to be exhausted can bypass the filter assembly 18, while only the inlet air passes through the filter assembly 18, reducing the wear of the filter assembly 18.

[0040] To ensure a simple, reliable, and easy-to-assemble structure, the preferred embodiment of this invention uses a second stepper motor connected to the second air vane 14. Driven by the second stepper motor, the second air vane 14 rotates to switch between connecting the second air duct 6 to the fresh air outlet 10 or to the exhaust duct 17. Specifically, the second stepper motor rotates in a first state to rotate the second air vane 14 and block the fresh air outlet 10, and in a second state to rotate the second air vane 14 and block the exhaust duct 17. In fresh air mode, the second air vane 14 switches to connect the second air duct 6 to the fresh air outlet 10, ensuring that the purified and heat-exchanged fresh air is smoothly delivered indoors. In exhaust mode, the second air vane 14 rotates to connect the second air duct 6 to the third air duct 9, guiding air from the exhaust duct 17 to the outside. This allows a single centrifugal fan 5 to simultaneously achieve multiple modes, reducing structural complexity and manufacturing costs.

[0041] To ensure a simple, reliable, and easy-to-assemble structure, the preferred embodiment of this invention is as follows: the stepper motor connected to the first air deflector 13 is the first stepper motor. The shaft of the first stepper motor is located at the internal circulation air inlet 8. The shaft of the first stepper motor extends to form a support arm, and the first air deflector 13 is fixed to the support arm. The first air deflector 13, driven by the shaft, blocks either the internal circulation air inlet 8 or the fresh air inlet 7. Specifically, the first state of the first stepper motor is to drive the first air deflector 13 to rotate and block the internal circulation air inlet 8, and the second state is to drive the first air deflector 13 to rotate and block the fresh air inlet 7.

[0042] like Figure 3 As shown, this technical solution, by setting a rotating first air plate 13, a second air plate 14, a third air plate 15, and multiple air ducts, can simultaneously achieve three modes: fresh air introduction, exhaust air, and internal circulation. When fresh air is introduced from the outside, the first air plate 13 rotates to cover the internal circulation air inlet 8, so that the third air duct 9 is connected to the fresh air inlet 7. The second air plate 14 rotates to cover the exhaust air duct 17, so that the second air duct 6 is connected to the fresh air outlet 10. The third air plate 15 rotates to cover the exhaust air inlet 11, connecting the first air duct 4 and the third air duct 9. After the centrifugal fan 5 is turned on, outdoor air enters through the fresh air inlet 7, enters the first air duct 4 through the third air duct 9, enters the second air duct 6 under the action of the centrifugal fan 5, and is then discharged from the fresh air outlet 10 from the second air duct 6, thus realizing the introduction of fresh air.

[0043] In internal circulation mode, rotating the first air deflector 13 blocks the fresh air inlet 7, connecting the third air duct 9 with the internal circulation inlet 8. Rotating the second air deflector 14 blocks the exhaust duct 17, connecting the second air duct 6 with the fresh air outlet 10. Rotating the third air deflector 15 blocks the exhaust air inlet 11, connecting the first air duct 4 with the third air duct 9. After turning on the centrifugal fan 5, the internal circulation air enters from the internal circulation inlet 8 and flows out from the fresh air outlet 10.

[0044] like Figure 4 As shown, in exhaust mode, the first air deflector 13 rotates to block the internal circulation air inlet 8, so that the third air duct 9 is connected to the fresh air inlet 7. The second air deflector 14 rotates to block the fresh air outlet 10, so that the second air duct 6 is connected to the third air duct 9. The third air deflector 15 rotates to block the air inlet of the first air duct 4. Since the first air duct 4 is connected to the third air duct 9, the air to be exhausted enters the first air duct 4 through the exhaust air inlet 11, enters the second air duct 6 under the action of the centrifugal fan 5, and is then discharged from the fresh air inlet 7 through the second air duct 6 and the third air duct 9.

[0045] This invention utilizes a three-rotatable air vane combined with a multi-duct structure to achieve three operating modes: fresh air introduction, exhaust, and internal circulation. When switching between modes, simply rotating the corresponding air vane changes the airflow direction. This design makes the system more flexible and efficient, while reducing the hardware requirements and maintenance costs of the control system.

[0046] In this technical solution, the air duct structure is a double-layer structure. The centrifugal fan 5 is located below the cover plate 3, connecting the first air duct 4 and the second air duct 6, greatly improving space utilization and air duct efficiency, significantly reducing the overall size of the unit, and achieving a compact arrangement of the upper and lower airflow channels, meeting the dual requirements of efficient ventilation and compact space. This technical solution uses a single centrifugal fan 5 to complete multiple functions such as fresh air, exhaust air, and internal circulation. Sharing a single centrifugal fan 5 not only reduces hardware costs but also reduces energy consumption and maintenance workload. This technical solution requires only 3 air dampers to complete path switching. More air damper assemblies often lead to higher costs (conventionally, 4-5 damper assemblies are required), and this technical solution can reduce some costs.

[0047] To ensure a simple, reliable, and easy-to-assemble structure, the preferred embodiment of this invention features an air vent on the cover plate 3 opposite to the centrifugal fan 5. A guide plate is fixed to the cover plate 3, forming a first air duct 4 near the air vent. The guide plate includes an arc plate 19 and straight baffles 20 connected to both ends of the arc plate 19. The arc plate 19 surrounds the air vent. The combination of the arc plate 19 and the straight baffles 20 guides the airflow to the first air duct 4, improving airflow efficiency. The arc plate 19's surrounding the air vent optimizes the airflow path, reducing airflow turbulence and energy loss. The arc plate 19 effectively reduces airflow resistance around the air vent and lowers noise caused by airflow impact. The top surface of the guide plate fits snugly against the lower surface of the cover, effectively preventing airflow leakage from the top of the guide plate. This further improves the airtightness of the air duct, ensuring that the airflow follows the designed path, thereby enhancing the system's operational stability.

[0048] To ensure a simple, reliable, and easy-to-assemble structure, the preferred embodiment of this utility model is as follows: a fresh air motor 21 is provided at the bottom of the box 1, and the output end of the fresh air motor 21 is connected to a centrifugal fan 5. The centrifugal fan 5 is annular and has multiple fan blades 22 arranged in a circumferential array, and the cross-section of the fan blades 22 is arc-shaped.

[0049] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. Fresh air module, characterized in that: The box includes a box body (1), an air guide plate, a top cover (2) covering the box body (1), and a cover plate (3) located in the middle of the box body (1). The upper surface of the cover plate (3) is provided with a first air duct (4), and a centrifugal fan (5) is rotatably provided below the cover plate (3). A second air duct (6) is provided around the centrifugal fan (5). The rotation of the centrifugal fan (5) can introduce the air in the first air duct (4) into the second air duct (6). The box body (1) is provided with a first side wall and a second side wall. A fresh air inlet (7) is provided on the first side wall, and an internal circulation air inlet (8) is provided above the fresh air inlet (7). The box body (1) also includes a third air duct (9) that is connected to both the fresh air inlet (7) and the internal circulation air inlet (8). A fresh air outlet (10) is provided on the second side wall, and an exhaust air inlet (11) is provided on the top cover (2). The air guide plate includes a first air plate (13), a second air plate (14), and a third air plate (15). The first air plate (13), the second air plate (14), and the third air plate (15) are each equipped with a rotating mechanism. The rotating mechanism drives the first air plate (13), the second air plate (14), and the third air plate (15) to rotate. The first air plate (13) can rotate to switch the third air duct (9) to be connected only to the fresh air inlet (7) or only to the internal circulation air inlet (8). The second air plate (14) can rotate to switch the second air duct (6) to be connected only to the fresh air outlet (10) or only to the third air duct (9). The third air plate (15) can rotate to switch to be connected only to the first air duct (4) and the third air duct (9) or only to the exhaust air inlet (11).

2. Fresh air module according to claim 1, characterized in that: The bottom of the box (1) is provided with a shielding rib (16), which is arranged around the periphery of the centrifugal fan (5). There is a gap between the shielding rib (16) and the centrifugal fan (5) and a second air duct (6) is formed through the gap. An exhaust channel (17) is also formed between the shielding rib (16) and the inner wall of the box (1). The second air duct (6) can be connected to the third air duct (9) through the exhaust channel (17).

3. Fresh air module according to claim 2, characterized in that: It also includes a filter assembly (18), and the top cover (2) has a filter installation port (24) for inserting the filter assembly (18) on its upper surface. The filter assembly (18) is detachably connected to the top cover (2) and the filter assembly (18) is located at the inlet end of the first air duct (4).

4. The fresh air module according to claim 3, characterized in that: The rotating mechanism also includes multiple stepper motors fixed inside the housing (1). Each stepper motor includes a rotating shaft. The first air plate (13), the second air plate (14), and the third air plate (15) are respectively connected to the rotating shaft of the stepper motor. The rotating mechanism can drive the first air plate (13), the second air plate (14), and the third air plate (15) to be in the first state and the second state, respectively.

5. The fresh air module according to claim 4, characterized in that: The stepper motor connected to the third air plate (15) is the third stepper motor. The internal circulation air inlet (8) and the filter installation port (24) are arranged adjacent to each other, and the internal circulation air inlet (8) is closer to the centrifugal fan (5). The shaft of the third stepper motor is set between the internal circulation air inlet (8) and the filter installation port (24). The rotation of the shaft of the third stepper motor drives the third air plate (15) to rotate to shield the internal circulation air inlet (8) or shield the inlet end of the first air duct (4).

6. The fresh air module according to claim 4, characterized in that: The stepper motor connected to the second air plate (14) is the second stepper motor. The second air plate (14) rotates under the drive of the second stepper motor to switch the second air duct (6) to connect with the fresh air outlet (10) or to the exhaust air duct (17).

7. The fresh air module according to claim 4, characterized in that: The stepper motor connected to the first air deflector (13) is the first stepper motor. The first air deflector (13) is driven by the rotating shaft to cover the internal circulation air inlet (8) or the fresh air inlet (7).

8. The fresh air module according to claim 1, characterized in that: The cover plate (3) is provided with air holes opposite to the centrifugal fan (5). A guide plate is fixed on the cover plate (3) and forms a first air duct (4) through the guide plate. The guide plate includes an arc plate (19) and a straight wind deflector (20) connected to both ends of the arc plate (19) for guiding the air direction. The arc plate (19) is arranged around the air hole.

9. The fresh air module according to claim 8, characterized in that: The top surface of the air guide plate is in contact with the lower surface of the top cover (2).

10. A constant temperature fresh air purification system, characterized in that: The system includes the fresh air module as described in any one of claims 1-9, and further includes a duct unit (12), wherein the fresh air outlet (10) is connected to the inlet end of the duct unit (12).

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