A two-way flow intelligent control pipeline fresh air machine and its control method

Abstract

The present invention discloses a two-way flow intelligent control duct fresh air machine and its control method. The duct fresh air machine includes a fresh air machine body having a presenting part and an inlaid part; a fresh air passage and an exhaust passage are provided inside the fresh air machine body; the fresh air passage is successively provided with a fresh air inlet, a fresh air fan, an air filter and a fresh air outlet along the wind direction; the exhaust passage is successively provided with an exhaust inlet, a carbon dioxide detector, an exhaust fan and an exhaust outlet along the wind direction; a smart control board is also installed on the presenting part. The above-mentioned fresh air machine integrates the fresh air fan and the exhaust fan on a smaller fresh air machine body to form non-interfering fresh air passage and exhaust passage, so as to achieve the effect of full displacement ventilation, continuously provide fresh air for the indoor environment, and then optimize the displacement ventilation efficiency by using the carbon dioxide detector and the smart control board with the indoor carbon dioxide content as the control standard, reducing the operating power of the fan while achieving the ventilation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of duct fresh air fans, and particularly to a two-way flow intelligent control duct fresh air fan and its control method. Background Art

[0002] A fresh air fan is an effective air purification device that can circulate indoor air. On the one hand, it discharges the dirty indoor air outdoors, and on the other hand, it filters the fresh outdoor air and then inputs it into the room, reducing the carbon dioxide content in the room and allowing the air in the room to be fresh and clean at all times.

[0003] A two-way flow fresh air fan refers to a fresh air fan that adopts a two-way flow delivery method. The fresh air fan continuously sends the fresh air after being processed by the fresh air fan outdoors into the room, while the exhaust fan continuously discharges the turbid air in the room to maintain a slightly positive pressure in the room and prevent outdoor air from entering through unprocessed ways such as door gaps. The two-way flow duct fresh air fan also adopts an embedded installation method, installed on the wall or glass window (also known as a wall-mounted fresh air fan to distinguish it from the traditional duct fresh air system), and is connected to the outdoors to achieve indoor ventilation replacement, avoiding the problems of large volume, troublesome installation, and inconvenient later maintenance existing in the traditional large fresh air system.

[0004] Currently, general duct fresh air fans use a single fan to achieve simple indoor ventilation replacement. For example, patent CN210241903U discloses a wall-mounted fresh air fan. By setting a single fresh air fan, the outdoor air is filtered by the filter assembly and then used for indoor ventilation replacement. Although the above technology can achieve the flow of indoor and outdoor air, due to the use of a single fresh air fan to introduce too much or too little fresh air and without detecting and analyzing the indoor air, the indoor air quality will be poor, with more carbon dioxide, or a large amount of fresh air is continuously introduced, resulting in high power consumption. At the same time, because the indoor air is naturally discharged, the carbon dioxide in the room cannot be discharged in time, and more carbon dioxide will accumulate in the room.

[0005] Or the duct fresh air fan uses a single fan with forward and reverse rotation. When fresh air is needed, the fan draws in the fresh outdoor air in the forward rotation mode to achieve air supply. When exhaust is needed, the fan draws out the indoor air in the reverse rotation mode to achieve exhaust. It has the following problems: by changing the forward and reverse rotation of the fan to achieve the switching between fresh air and exhaust, but when exhausting, the air will also pass through the filter screen and then be exhausted, so there is a risk that harmful substances in the room will be adsorbed on the other side of the filter screen and then be blown into the room when the fan rotates forward to supply fresh air, resulting in poor ventilation replacement effect. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a two-way flow intelligent control duct fresh air machine, which solves the above-mentioned traditional problems and can effectively ventilate and replace the air between the indoor and outdoor, continuously providing fresh air for the indoor.

[0007] Another objective of the present invention is to provide a control method for the two-way flow intelligent control duct fresh air machine.

[0008] One of the objectives of the present invention is achieved by adopting the following technical solutions:

[0009] A two-way flow intelligent control duct fresh air machine includes a fresh air machine body having a presenting part and an inlaid part; a fresh air passage and an exhaust passage are provided inside the fresh air machine body; the fresh air passage is sequentially provided with a fresh air inlet, a fresh air fan, an air filter, and a fresh air outlet along the wind direction; the exhaust passage is sequentially provided with an exhaust inlet, a carbon dioxide detector, an exhaust fan, and an exhaust outlet along the wind direction; the fresh air outlet and the exhaust inlet are provided on the presenting part; the fresh air inlet and the exhaust outlet are provided on the inlaid part; an intelligent control board is further installed on the presenting part, and the intelligent control board is electrically connected to the fresh air fan, the carbon dioxide detector, and the exhaust fan.

[0010] Preferably, a separating component for separating the fresh air passage and the exhaust passage is provided inside the fresh air machine body, and the separating component has a landslide step structure in the longitudinal section.

[0011] Preferably, the fresh air passage has a fresh air heat recovery section, and the exhaust passage has an exhaust heat recovery section. The fresh air heat recovery section and the exhaust heat recovery section are respectively arranged on the opposite sides of the landslide part of the separating component, so that the fresh air heat recovery section and the exhaust heat recovery section perform heat exchange through the landslide part.

[0012] Preferably, the separating component further has an arc part, and the arc part cooperates with the landslide part and the inner wall of the fresh air machine body to form a landslide inlet section in front of the exhaust fan. The landslide inlet section includes an inlet front end, an inlet body, and an inlet rear end. The relative sides of the inlet front end are gradually increased towards the inlet, the inlet body is crescent-shaped in the longitudinal section, and the inlet rear end is gradually increased along the exhaust direction.

[0013] Preferably, spoiler strips are provided on the relative sides of the inlet front end, and the spoiler strips are arranged horizontally.

[0014] Preferably, the presenting part is provided with a first installation position and a second installation position. The first installation position is used for installing the air filter, and at least one LED ultraviolet lamp is installed at the second installation position. The LED ultraviolet lamp is located at the air inlet of the air filter.

[0015] Preferably, a shutter is further installed at the air outlet of the air filter, and the air filter is a coarse-high efficiency composite filter; the fresh air outlet is arranged on the front of the presenting part, the exhaust air inlet is arranged at the upper end of the presenting part, and the exhaust air direction of the exhaust air inlet is perpendicular to the fresh air direction of the fresh air outlet.

[0016] Preferably, the inlaid part is provided with a second installation position and a third installation position. The second installation position is used for installing the fresh air fan; the third installation position is used for installing the exhaust air fan, and the fresh air fan and the exhaust air fan are installed in a staggered manner; the fresh air direction of the fresh air inlet is perpendicular to the fresh air direction of the fresh air outlet; the exhaust air direction of the exhaust air inlet is perpendicular to the exhaust air direction of the exhaust air outlet.

[0017] The second object of the present invention is achieved by the following technical solution:

[0018] A control method for a two-way flow intelligent control duct fresh air fan includes the following steps:

[0019] S1: Start the fresh air fan, execute the set gear operation, start the fresh air fan and the exhaust air fan, perform ventilation and air exchange of fresh air and exhaust air in the room, and detect the air condition in the room through a carbon dioxide detector.

[0020] S2: When the carbon dioxide content in the room exceeds the first threshold, execute the maximum gear operation, make the fresh air fan and the exhaust air fan run at the maximum speed, and forcibly ventilate; when the carbon dioxide content in the room does not exceed the second threshold, execute the set gear operation.

[0021] Preferably, the first threshold is 1000 ppm; the second threshold is 800 ppm.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The two-way flow intelligent control duct fresh air fan of the present invention forms a fresh air channel and an exhaust air channel that do not interfere with each other by setting a fresh air fan body with a presenting part and an inlaid part. The presenting part is placed indoors, the inlaid part is installed on the glass or wall and communicates with the outside, and the fresh air fan and the exhaust air fan are integrated on a smaller fresh air fan body to achieve the effect of total displacement ventilation, continuously providing fresh air for the room. Then, through the carbon dioxide detector and the intelligent control board, taking the carbon dioxide content in the room as the control standard, the displacement ventilation efficiency is optimized, and the operating power of the fan is reduced on the basis of achieving the ventilation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a two-way flow intelligent control duct fresh air fan according to a preferred embodiment of the present invention;

[0025] Figure 2 For Figure 1 The sectional view of the first exhaust outlet in the two-way flow intelligent control duct fresh air fan shown;

[0026] Figure 3 For Figure 2 The combined front elevation schematic diagram of the fresh air heat recovery section and the exhaust air heat recovery section shown;

[0027] Figure 4 For Figure 3 The combined rear elevation schematic diagram of the fresh air heat recovery section and the exhaust air heat recovery section shown;

[0028] Figure 5 For Figure 1 The sectional view of the second exhaust outlet in the two-way flow intelligent control duct fresh air fan shown.

[0029] In the figure: 10, fresh air fan body; 11, presenting part; 110, intelligent control board; 12, inlaid part; 13, fresh air channel; 130, fresh air inlet; 131, fresh air fan; 132, air filter; 133, fresh air outlet; 134, fresh air heat recovery section; 135, shutter; 14, exhaust air channel; 140, exhaust air inlet; 141, carbon dioxide detector; 142, exhaust air fan; 143, exhaust air outlet; 144, exhaust air heat recovery section; 145, front end of the inlet; 146, inlet body; 147, rear end of the inlet; 148, spoiler; 15, separating component; 150, landslide part; 151, arc part; 16, LED ultraviolet lamp. Specific embodiments

[0030] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the description of the present invention, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be intermediate elements present. In contrast, when an element is referred to as being "directly" connected to another element, there are no intermediate elements.

[0033] Please refer to Figures 1-5 , a two-way flow intelligent control duct fresh air machine of a preferred embodiment of the present invention, which is used to be installed indoors by means of installation on glass or a wall, and ventilates and replaces the indoor air. Specifically, the two-way flow intelligent control duct fresh air machine includes a fresh air machine body 10 having a presenting part 11 and an inlaying part 12; a fresh air channel 13 and an exhaust air channel 14 are provided inside the fresh air machine body 10; the fresh air channel 13 is sequentially provided with a fresh air inlet 130, a fresh air fan 131, an air filter 132 and a fresh air outlet 133 along the wind direction; the exhaust air channel 14 is sequentially provided with an exhaust air inlet 140, a carbon dioxide detector 141, an exhaust air fan 142 and an exhaust air outlet 143 along the wind direction; the fresh air outlet 133 and the exhaust air inlet 140 are provided on the presenting part 11; the fresh air inlet 130 and the exhaust air outlet 143 are provided on the inlaying part 12; a smart control board 110 is further installed on the presenting part 11, and the smart control board 110 is electrically connected to the fresh air fan 131, the carbon dioxide detector 141 and the exhaust air fan 142.

[0034] Among them, the presenting part 11 is presented indoors, blowing fresh air through the fresh air outlet 133, and the exhaust air inlet 140 sucking in the dirty air in the room; the inlaying part 12 is embedded in the wall or glass and communicates with the outside. It sucks in outdoor air through the fresh air inlet 130, and after being processed by the air filter 132, it supplements the fresh air in the room. The exhaust air outlet 143 discharges the dirty air in the room, and it can bypass the filter screen, saving costs while reducing the exhaust air resistance, thereby increasing the exhaust air volume, effectively discharging volatile substances such as formaldehyde, benzene, xylene, and TVOC in the room, and not accumulating in the machine body. The smart control board 110 is installed on the presenting part 11, and the smart control board 110 is equipped with a control system to realize the intelligent control of the fresh air machine, and adjusts the rotation speeds of the fresh air fan 131 and the exhaust air fan 142 according to the carbon dioxide content in the room, reducing the operating power of the fan on the basis of achieving the ventilation effect.

[0035] Please refer to Figure 1 and Figure 2, the fresh air machine body 10 is generally in a square structure, such as a rectangular or square structure. Among them, the fresh air channel 13 and the exhaust air channel 14 are located inside the fresh air machine body 10 and are two separate and non-interfering channels. The fresh air channel 13 is used to inhale fresh air from the outside, and the exhaust air channel 14 is used to discharge the polluted air indoors. The fresh air channel 13 and the exhaust air channel 14 are in an up-and-down structure or a left-and-right structure. In this embodiment, the fresh air channel 13 is located below the exhaust air channel 14. The fresh air inlet 130 is located on the front of the fresh air machine body 10, that is, the side facing the indoors, and the exhaust air inlet 140 is located at the upper end of the fresh air machine body 10, that is, the side facing the indoor ceiling. Although the density of carbon dioxide is greater than that of air and carbon dioxide usually sinks, the carbon dioxide content near the ground in the air is slightly more. However, since the carbon dioxide exhaled from the human body is hotter than the outside air when it is just exhaled, it often becomes part of the hot air flow in the air and rises upward. Therefore, the exhaust air inlet 140 is arranged facing the indoor ceiling, which is beneficial to discharging more carbon dioxide, so as to better purify the indoor air.

[0036] Please refer to Figures 2-4 , a separating component 15 for separating the fresh air channel 13 and the exhaust air channel 14 is provided inside the fresh air machine body 10. The separating component 15 has a landslide step structure in the longitudinal section (as Figure 2 shown). Understandably, the separating component 15 separates the fresh air machine body 10 into the fresh air channel 13 and the exhaust air channel 14. The separating component 15 is reasonably designed according to the components inside the machine body, so that while the overall structure is smaller, a better displacement ventilation effect can be achieved. In one embodiment, the fresh air channel 13 has a fresh air heat recovery section 134, and the exhaust air channel 14 has an exhaust air heat recovery section 144. The fresh air heat recovery section 134 and the exhaust air heat recovery section 144 are respectively arranged on opposite sides of the landslide part 150 of the separating component 15, so that the fresh air heat recovery section 134 and the exhaust air heat recovery section 144 perform heat exchange through the landslide part 150. That is, before the discharged air is exhausted, the heat it contains is exchanged with the newly introduced air, so that when the newly introduced air is input into the room, the indoor air temperature will not fluctuate greatly. Optionally, the landslide part 150 of the separating component 15 is made of a material with good heat conduction, or heat exchange materials such as carbon fiber, a heat exchange coating doped with multi-walled carbon nanotubes, fins, etc. are arranged on opposite sides of the landslide part 150.

[0037] In another embodiment, as Figure 3 and Figure 4, the separating component 15 further has an arc-shaped portion 151, and the arc-shaped portion 151 cooperates with the landslide portion 150 and the inner wall of the fresh air fan body 10 to form a landslide inlet section in front of the exhaust fan 142. The landslide inlet section includes an inlet front end 145, an inlet body 146, and an inlet rear end 147; the inlet front end 145 is gradually increased towards the inlet on the relative two sides close to the inlet, that is, around the installation position of the fresh air fan 131, an arc-shaped inlet front end 145 is formed; the inlet body 146 is crescent-shaped in the longitudinal section (such as Figure 3 ), the inlet rear end 147 is gradually increased along the exhaust direction (such as Figure 4 ). With such a setting, a small vortex-shaped exhaust air flow is formed in the exhaust passage 14, which accelerates the mixing of the fluid near the wall surface and the fluid in the mainstream area, destroys the boundary layer, improves the wall heat transfer coefficient, and thus enhances the heat exchange. Optionally, spoiler strips 148 are provided on the relative two sides of the inlet front end 145, and the spoiler strips 148 are arranged in a transverse extension to increase the fluidity of the exhaust air flow on the wall surface.

[0038] Please refer to Figure 2 again. The presenting part 11 is provided with a first installation position and a second installation position. The first installation position is used to install the air filter 132, and at least one LED ultraviolet lamp 16 is installed in the second installation position. The LED ultraviolet lamp 16 is located at the air inlet of the air filter 132, so that the air filter 132 captures bacteria in the air and then the LED ultraviolet lamp 16 kills them, reducing the bacteria rate on the air filter 132. At the same time, the LED ultraviolet lamp 16 has a strong bactericidal effect and can improve the bactericidal efficiency. Then, through the filter, particulate pollutants such as PM2.5 are removed to ensure that the air sent into the room is clean air. In this embodiment, the number of LED ultraviolet lamps 16 is 5, and they are evenly distributed on the second installation position to make the bactericidal effect better.

[0039] In one embodiment, a shutter 135 is further installed at the air outlet of the air filter 132, which can facilitate the adjustment of the fresh air direction. The air filter 132 is a coarse-high efficiency composite filter, that is, a filter composed of a primary filter and a high efficiency filter, to improve the air purification effect. Optionally, the fresh air outlet 133 is provided on the front surface of the presenting part 11, and the exhaust air inlet 140 is provided at the upper end of the presenting part 11, and the exhaust air direction of the exhaust air inlet 140 is perpendicular to the fresh air direction of the fresh air outlet 133.

[0040] In some other embodiments, the inlaid part 12 is provided with a second installation position and a third installation position. The second installation position is used for installing the fresh air fan 131; the third installation position is used for installing the exhaust fan 142. The fresh air fan 131 and the exhaust fan 142 are staggeredly installed; the fresh air direction at the fresh air inlet 130 and the fresh air direction at the fresh air outlet 133 are vertically arranged, and the fresh air inlet 130 is directly opposite to the landslide part 150 of the partition member 15, so that the fresh air forms an arc-shaped flow direction in the fresh air channel 13, which is convenient for better heat exchange; the exhaust air direction at the exhaust air inlet 140 and the exhaust air direction at the exhaust air outlet 143 are vertically arranged. Optionally, a barrier grid or a barrier net is installed at the fresh air inlet 130 to block foreign substances and prevent them from climbing into the machine body. A rain shield (such as Figure 2 shown) is installed at the exhaust air outlet 143 to block rainwater from drifting into the exhaust air port and at the same time adjust the air outlet direction. Optionally, a rain cover (such as Figure 5 ) is installed at the exhaust air outlet 143, which can better block rainwater.

[0041] The principle is as follows:

[0042] Fresh air system: The outdoor fresh air is powered by the fresh air fan 131 and enters the machine body from the fresh air inlet 130. After colliding with the landslide part 150 of the partition member 15 or the fresh air heat recovery section 134, heat exchange occurs, and the exhaust heat is recovered. Then, it passes through the fresh air fan 131, the LED ultraviolet lamp 16, and the air filter in sequence to remove particulate pollutants such as PM2.5. At the same time, the LED ultraviolet lamp 16 sterilizes the filter all the time when the machine is turned on. After the outdoor air goes through the above steps, it is blown out from the fresh air outlet 133 and sent into the room.

[0043] Exhaust air system: The indoor dirty air is powered by the exhaust air fan 142 and is extracted from the exhaust air inlet 140. Then, it passes through the arc part 151 and the landslide part 150 and the inner wall of the fresh air machine body 10 to form a landslide inlet section in front of the exhaust air fan 142. The air flow in a small vortex shape exchanges heat with the fresh air in the exhaust air heat recovery section 144, and then passes through the exhaust air fan 142 and the exhaust air outlet 143 and is discharged outdoors. Since the exhaust air flow does not pass through the filter screen, the exhaust air resistance is reduced, the exhaust air volume is increased, and volatile substances such as formaldehyde, benzene, xylene, and TVOC in the room can be effectively discharged.

[0044] The above-mentioned two-way flow intelligent control duct fresh air unit is provided with a fresh air unit body 10 having a presenting part 11 and an inlaid part 12. The presenting part 11 is placed indoors, and the inlaid part 12 is installed on the glass or wall and communicates with the outdoors. The fresh air fan 131 and the exhaust air fan 142 are integrated on a relatively small fresh air unit body 10 to form non-interfering fresh air channels 13 and exhaust air channels 14, so as to achieve the effect of full displacement ventilation, continuously provide fresh air for the indoor environment, and then, through the carbon dioxide detector 141 and the intelligent control board 110, with the indoor carbon dioxide content as the control standard, optimize the displacement ventilation efficiency, and reduce the operating power of the fans on the basis of achieving the ventilation effect.

[0045] The present invention also provides a control method for the two-way flow intelligent control duct fresh air unit, which includes the following steps:

[0046] S1: Start the fresh air unit, execute the set gear operation, start the fresh air fan 131 and the exhaust air fan 142, perform ventilation and air exchange of fresh air and exhaust air in the room, and detect the indoor air conditions through the carbon dioxide detector 141;

[0047] S2: When the indoor carbon dioxide content exceeds the first threshold, execute the maximum gear operation, make the fresh air fan 131 and the exhaust air fan 142 operate at the maximum speed, and forcibly perform ventilation and air exchange; when the indoor carbon dioxide content does not exceed the second threshold, execute the set gear operation.

[0048] That is, when the body is operating, continuously feedback the indoor air conditions through the carbon dioxide detector 141, with the indoor carbon dioxide content as the control standard, the control system performs intelligent control, and switches between the set gear and the maximum gear to optimize the displacement ventilation efficiency and reduce the operating power of the fans on the basis of achieving the ventilation effect. Among them, whether it is the set gear or the maximum gear, the power of the fresh air fan 131 should be greater than the power of the exhaust air fan 142 to maintain a slightly positive pressure effect indoors.

[0049] In one embodiment, the first threshold is 1000 ppm; the second threshold is 800 ppm.

[0050] The technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as the combinations of these technical features do not conflict, they should be considered as the scope described in this specification.

[0051] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A two-way flow intelligent control duct fresh air unit, characterized in that, it includes a fresh air unit body with a presenting part and an inlaid part; a fresh air passage and an exhaust passage are provided in the fresh air unit body; the fresh air passage is successively provided with a fresh air inlet, a fresh air fan, an air filter and a fresh air outlet along the wind direction; the exhaust passage is successively provided with an exhaust inlet, a carbon dioxide detector, an exhaust fan and an exhaust outlet along the wind direction; the fresh air outlet and the exhaust inlet are arranged on the presenting part; the fresh air inlet and the exhaust outlet are arranged on the inlaid part; an intelligent control board is further installed on the presenting part, and the intelligent control board is electrically connected to the fresh air fan, the carbon dioxide detector and the exhaust fan; a separating component for separating the fresh air passage and the exhaust passage is provided in the fresh air unit body, and the separating component is in a landslide step structure in the longitudinal section; the fresh air passage has a fresh air heat recovery section, and the exhaust passage has an exhaust heat recovery section. The fresh air heat recovery section and the exhaust heat recovery section are respectively arranged on opposite sides of the landslide part of the separating component, so that the fresh air heat recovery section and the exhaust heat recovery section perform heat exchange through the landslide part; the separating component further has an arc part, and the arc part cooperates with the landslide part and the inner wall of the fresh air unit body to form a landslide inlet section in front of the exhaust fan. The landslide inlet section includes an inlet front end, an inlet body and an inlet rear end. The relative two sides of the inlet front end are gradually increased towards the inlet, the inlet body is crescent-shaped in the longitudinal section, and the inlet rear end is gradually increased along the exhaust direction; the presenting part is provided with a first installation position and a second installation position. The first installation position is used for installing the air filter, and at least one LED ultraviolet lamp is installed at the second installation position. The LED ultraviolet lamp is located at the air inlet of the air filter; a shutter is further installed at the air outlet of the air filter, and the air filter is a coarse-high efficiency composite filter; the fresh air outlet is arranged on the front surface of the presenting part, the exhaust inlet is arranged at the upper end of the presenting part, and the exhaust wind direction of the exhaust inlet is perpendicular to the fresh air wind direction of the fresh air outlet; the inlaid part is provided with a second installation position and a third installation position. The second installation position is used for installing the fresh air fan; the third installation position is used for installing the exhaust fan, and the fresh air fan and the exhaust fan are installed in a staggered manner; the fresh air wind direction of the fresh air inlet is perpendicular to the fresh air wind direction of the fresh air outlet; the exhaust wind direction of the exhaust inlet is perpendicular to the exhaust wind direction of the exhaust outlet; Heat exchange materials are provided on opposite sides of the landslide part, and the heat exchange materials are one or more of heat exchange coatings and fins; turbulator strips are provided on opposite sides of the inlet front end, and the turbulator strips are arranged in a transverse extension.

2. A control method for the two-way flow intelligent control duct fresh air unit according to claim 1, characterized in that, it includes the following steps: S1: Start the fresh air fan and operate at the set gear. Start the fresh air blower and the exhaust blower to conduct ventilation and air exchange of fresh air and exhaust air in the room, and detect the air condition in the room through a carbon dioxide detector. S2: When the carbon dioxide content in the room exceeds the first threshold, operate at the maximum gear to make the fresh air blower and the exhaust blower run at the maximum speed for forced ventilation and air exchange; when the carbon dioxide content in the room does not exceed the second threshold, operate at the set gear. Among them, the power of the fresh air blower is greater than that of the exhaust blower.

3. The control method according to claim 2, characterized in that the first threshold is 1000 ppm; the second threshold is 800 ppm.

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