Air mixing device and method

Abstract

The application belongs to the technical field of air conditioning, and provides an air mixing device and method. Return air pipes, first fresh air pipes and second fresh air pipes are respectively communicated with return air chambers, first air mixing chambers and second air mixing chambers. Return air enters the first air mixing chambers and the second air mixing chambers through the arc-shaped chamber plates at the corresponding positions after entering the return air chambers from the return air pipes. The return air is preliminarily mixed with fresh air in the first air mixing chambers and the second air mixing chambers, and then enters the third air mixing chamber through the arc-shaped chamber plates at the corresponding positions to realize the second mixing. The cooperation of the arc-shaped chamber plates and the air guide holes can change the wind direction and disperse the air to the greatest extent, and avoid the problem that most of the fresh air and the return air flow to the outlet direction of the air supply pipe according to the wind direction when entering the chamber under the action of inertia. The mixing efficiency and uniformity are improved without increasing the structural complexity and the equipment such as the fan. Meanwhile, a mixing device is arranged in the second air mixing area to further improve the uniformity.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, and particularly relates to an air mixing device and method. Background Technology

[0002] In modern building and industrial environments, air conditioning systems are a key component in maintaining indoor comfort. Traditional air mixing devices typically employ simple mixing methods and lack precise control over airflow dynamics, resulting in low mixing efficiency, uneven mixing, and negatively impacting air quality and comfort.

[0003] Currently, the main reason for the low mixing efficiency and uneven mixing in air mixing devices is that after a large amount of fresh air and return air with a certain flow direction enter the mixing chamber, although some of the fresh air and return air are mixed by changing the airflow direction, most of the fresh air and return air still flow towards the air outlet of the air mixing device under the influence of inertia, resulting in poor mixing uniformity. Increasing the structural complexity of the air mixing device or adding fans can improve mixing efficiency and uniformity, but this increases costs. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes an air mixing device and method. Return air enters the return air chamber from the return air duct and then passes through arc-shaped cavity plates at corresponding positions into the first and second mixing chambers. The return air undergoes preliminary mixing with fresh air in both chambers before passing through the arc-shaped cavity plates again into the third mixing chamber for a second mixing. The combination of the arc-shaped cavity plates and the air guide holes maximizes the alteration of airflow direction and dispersion, preventing the problem of most fresh and return air flowing towards the outlet direction of the air supply duct due to inertia. This improves mixing efficiency and uniformity without increasing structural complexity or the need for fans and other equipment. Simultaneously, a mixer is installed in the second mixing zone to achieve a third mixing, further enhancing mixing uniformity.

[0005] To achieve the above objectives, in a first aspect, the present invention provides an air mixing device, which adopts the following technical solution:

[0006] An air mixing device includes a mixing box, a return air duct and a supply air duct respectively disposed at both ends of the mixing box, and a first fresh air duct and a second fresh air duct symmetrically disposed on the side wall of the mixing box; the mixing box includes a first mixing zone and a second mixing zone, and a partition is disposed between the first mixing zone and the second mixing zone.

[0007] The first mixing zone includes a return air chamber, a first mixing air chamber, a second mixing air chamber, and a third mixing air chamber; an arc-shaped cavity plate with air guide holes is provided between the return air chamber and the first mixing air chamber, between the return air chamber and the second mixing air chamber, between the first mixing air chamber and the third mixing air chamber, and between the second mixing air chamber and the third mixing air chamber; a mixer is provided in the second mixing zone;

[0008] The return air duct, the first fresh air duct, and the second fresh air duct are respectively connected to the return air chamber, the first mixing chamber, and the second mixing chamber; the third mixing chamber is connected to the second mixing zone through the partition.

[0009] Furthermore, a cylindrical baffle is provided inside the mixing box; one end of the four arc-shaped cavity plates is connected to the cylindrical baffle, and the other end is connected to the inner wall of the mixing box.

[0010] Furthermore, the first mixing chamber and the second mixing chamber are symmetrical about the axis of the mixing box, and the first fresh air duct and the second fresh air duct are symmetrical about the axis of the mixing box.

[0011] Furthermore, the arc-shaped cavity plate is uniformly provided with multiple air guide holes.

[0012] Furthermore, within the mixing chamber, the raised sides of two symmetrical arc-shaped cavity plates face the return air duct, while the raised sides of the other two symmetrical arc-shaped cavity plates face the first fresh air duct and the second fresh air duct, respectively.

[0013] Furthermore, a variable frequency fan is installed inside the mixing box, located between the mixer and the air supply duct; temperature and humidity sensors are installed on the return air duct, the air supply duct, the first fresh air duct, and the second fresh air duct; electrically adjustable dampers are installed on the return air duct, the first fresh air duct, and the second fresh air duct; a wind speed sensor is installed on the air supply duct; the temperature and humidity sensors, the electrically adjustable dampers, and the wind speed sensor are all connected to a controller; the controller is used to control the air supply temperature and the air supply volume.

[0014] Furthermore, the controller is configured to: when controlling the supply air temperature: when the detected values ​​of the temperature and humidity sensors at the first and second fresh air ducts are higher than the detected values ​​of the temperature and humidity sensors at the return air duct: if the detected value of the temperature and humidity sensor at the supply air duct is higher than the first temperature setpoint, reduce the opening of the electrically adjustable damper at the first and second fresh air ducts; if the detected value of the temperature and humidity sensor at the supply air duct is lower than the first temperature setpoint, reduce the opening of the electrically adjustable damper at the return air duct.

[0015] Furthermore, the controller is configured to: when the temperature and humidity sensor values ​​detected at the first fresh air duct and the second fresh air duct are lower than the temperature and humidity sensor values ​​detected at the return air duct: if the temperature and humidity sensor value detected at the supply air duct is higher than the second temperature setpoint, reduce the opening of the electric regulating damper at the return air duct; if the temperature and humidity sensor value detected at the supply air duct is lower than the second temperature setpoint, reduce the opening of the electric regulating damper at the first fresh air duct and the second fresh air duct.

[0016] When controlling the air supply volume: if the wind speed sensor value at the air supply duct is higher than the temperature set value, the operating frequency of the variable frequency fan is reduced, and the air supply volume is decreased; if the wind speed sensor value at the air supply duct is lower than the temperature set value, the operating frequency of the variable frequency fan is increased, and the air supply volume is increased.

[0017] Furthermore, the mixer includes a frame and a plurality of louver assemblies disposed within the frame; each louver assembly is provided with at least two blades; every four louver assemblies form a group, and the blades in each group of louver assemblies are inclined in a clockwise air outlet direction.

[0018] To achieve the above objectives, in a second aspect, the present invention also provides an air mixing method, employing the following technical solution:

[0019] An air mixing method using an air mixing device as described in the first aspect includes: after return air enters the return air chamber from the return air duct, it enters the first mixing chamber and the second mixing chamber respectively through arc-shaped cavity plates at corresponding positions; after the return air is initially mixed with fresh air in the first mixing chamber and the second mixing chamber respectively, it enters the third mixing chamber through the arc-shaped cavity plates at corresponding positions to achieve a second mixing; after the air in the third mixing chamber enters the second mixing zone, it passes through the mixer to achieve a third mixing.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. This invention divides the mixing chamber into a first mixing zone and a second mixing zone. The first mixing zone includes a return air chamber, a first mixing chamber, a second mixing chamber, and a third mixing chamber. Arc-shaped cavity plates with air guide holes are provided between the return air chamber and the first mixing chamber, between the return air chamber and the second mixing chamber, between the first mixing chamber and the third mixing chamber, and between the second mixing chamber and the third mixing chamber. The return air duct, the first fresh air duct, and the second fresh air duct are respectively connected to the return air chamber, the first mixing chamber, and the second mixing chamber. After the return air enters the return air chamber from the return air duct, it enters the first mixing chamber and the second mixing chamber through the arc-shaped cavity plates at corresponding positions. The return air is initially mixed with the fresh air in the first and second mixing chambers, and then enters the third mixing chamber through the corresponding arc-shaped cavity plate to achieve a second mixing. The combination of the arc-shaped cavity plate and the air guide hole can change the air direction and disperse the air to the greatest extent, avoiding the problem that most of the fresh air and return air flow towards the air supply duct outlet direction according to the air direction when entering the chamber under the action of inertia. Without increasing the structural complexity and equipment such as fans, the mixing efficiency and uniformity are improved. At the same time, a mixer is set in the second mixing zone to achieve the purpose of the third mixing, which further improves the mixing uniformity.

[0022] 2. The present invention, through the arc-shaped mechanism of the arc-shaped cavity plate, in conjunction with the arc-shaped mechanism of the cylindrical baffle surface, further improves the degree of airflow disorder at different locations in the return air duct, the first fresh air duct, and the second fresh air duct by changing the airflow direction, thereby improving the mixing effect and uniformity.

[0023] 3. In this invention, the first mixing chamber and the second mixing chamber, as well as the first fresh air duct and the second fresh air duct, are symmetrically distributed, so that the fresh air entering from the first fresh air duct and the second fresh air duct are symmetrically mixed with the return air in the middle position, so as to ensure the proportion of fresh air and return air during mixing as much as possible, and to ensure the consistency of the mixing of the air entering the third mixing chamber, thereby improving the uniformity of the overall mixed air.

[0024] 4. In this invention, multiple air guide holes are evenly arranged on the arc-shaped cavity plate; the convex sides of two symmetrical arc-shaped cavity plates face the return air duct, and the convex sides of the other two symmetrical arc-shaped cavity plates face the first fresh air duct and the second fresh air duct, respectively; the return air entering from the return air duct is dispersed on the convex side of the arc-shaped cavity plate and then enters the first fresh air duct and the second fresh air duct through the air guide holes at different positions; the mixed air that undergoes the first mixing in the first fresh air duct and the second fresh air duct is dispersed again on the convex side of the arc-shaped cavity plate and then enters the third mixing chamber through the air guide holes at different positions, thus maximizing the mixing effect of the return air and the first mixed air.

[0025] 5. In this invention, temperature and humidity sensors detect values ​​in real time, and the opening of the electric regulating damper is adjusted according to the detected values ​​to regulate the ratio of return air and fresh air, and the supply air temperature, thereby improving the comfort of air supply; wind speed sensors detect values ​​in real time, and the frequency of the variable frequency fan is adjusted according to the detected values ​​to accurately control the supply air volume.

[0026] 6. In this invention, the blades in each louver assembly are tilted in a clockwise direction of airflow, which generates an overall vortex airflow on the central axis of the outlet side frame and a local vortex airflow on the central axis of each louver assembly. The combination of the local vortex airflow and the overall vortex airflow greatly improves the contact and mixing effect of the return air and the fresh airflow. Attached Figure Description

[0027] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0028] Figure 1 This is a schematic diagram of the air mixing device according to Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the homogenizer in Embodiment 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the vortex flow direction of the homogenizer in Embodiment 1 of the present invention;

[0031] Figure 4 This is a schematic diagram of the control connection in Embodiment 1 of the present invention;

[0032] The components include: 1. Controller; 2. Mixing box; 3. First mixing zone; 4. Second mixing zone; 5. Variable frequency fan; 6. Partition; 7. Return air duct; 8. Supply air duct; 9. First fresh air duct; 10. Second fresh air duct; 11. Arc-shaped cavity plate; 12. Cylindrical baffle; 13. Air guide hole; 14. Return air cavity; 15. First mixing cavity; 16. Second mixing cavity; 17. Third mixing cavity; 18. Mixer; 19. Louver assembly; 20. Frame; 21. Blade; 22. Leading edge; 23. Trailing edge; 24. Deflection surface; 25. Electric regulating damper; 26. Temperature and humidity sensor; 27. Wind speed sensor. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0035] Example 1:

[0036] like Figure 1 As shown, this embodiment provides an air mixing device, including a controller 1 and a mixing box 2; the controller 1 can be a PLC system.

[0037] The mixing chamber 2 is provided with a return air duct 7 and a supply air duct 8 at its two ends, respectively. Inside the mixing chamber 2, along the direction from the return air duct 7 to the supply air duct 8, a baffle 6, a mixer 18, and a variable frequency fan 5 are arranged in sequence. The baffle 6 and the inner wall of the mixing chamber 2 near the end of the return air duct 7 form a first mixing zone 3; the baffle 6 and the inner wall of the mixing chamber 2 near the end of the supply air duct 8 form a second mixing zone 4.

[0038] At the first mixing zone 3, a first fresh air duct 9 and a second fresh air duct 10 are respectively installed on both sides of the mixing box 2. Temperature and humidity sensors 26 are installed on the return air duct 7, the supply air duct 8, the first fresh air duct 9, and the second fresh air duct 10; electrically adjustable dampers 25 are installed on the return air duct 7, the first fresh air duct 9, and the second fresh air duct 10; and a wind speed sensor 27 is installed on the supply air duct 8. Figure 4 As shown, the variable frequency fan 5, the temperature and humidity sensor 26, the electric regulating valve 25, and the wind speed sensor 27 are all connected to the controller.

[0039] Within the first mixing zone 3, a cylindrical baffle 12 is provided. Four arc-shaped cavity plates 11 connect the cylindrical baffle 12 to the inner wall of the mixing box 2. These four arc-shaped cavity plates 11 divide the first mixing zone 3 into a return air cavity 14, a first mixing air cavity 15, a second mixing air cavity 16, and a third mixing air cavity 17. The return air duct 7 communicates with the return air cavity 14; the first fresh air duct 9 communicates with the first mixing air cavity 15; and the second fresh air duct 10 communicates with the second mixing air cavity 16. The third mixing air cavity 17 is located near the partition 6. Air guide holes 13 are provided on each arc-shaped cavity plate 11.

[0040] Optionally, a return air duct 7 is provided at the center of one end of the mixing box 2, and a supply air duct 8 is provided at the center of the other end. The axes of the return air duct 7 and the supply air duct 8 are arranged along a first direction. The return air that needs to be mixed with the fresh air enters the return air chamber 14 through the return air duct 7.

[0041] The first fresh air duct 9 and the second fresh air duct 10 are symmetrically arranged with respect to the axis of the return air duct 7. The axes of the first fresh air duct 9 and the second fresh air duct 10 are set along a second direction, which is perpendicular to the first direction. The air volume of the first fresh air duct 9 and the second fresh air duct 10 are usually equal to ensure the uniformity of the mixed air. The first mixing zone 3 is provided with an arc-shaped cavity plate 11 and a cylindrical baffle 12. The cylindrical baffle 12 guides the return air and fresh air airflow to form an arc-shaped flow path, thereby enhancing the mixing effect between the two.

[0042] Specifically, the mixing chamber 2 is divided into a first mixing zone 3 and a second mixing zone 4. The first mixing zone 3 includes the return air chamber 14, the first mixing chamber 15, the second mixing chamber 16, and the third mixing chamber 17. Arc-shaped cavity plates 11 with air guide holes 13 are provided between the return air chamber 14 and the first mixing chamber 15, between the return air chamber 14 and the second mixing chamber 16, between the first mixing chamber 15 and the third mixing chamber 17, and between the second mixing chamber 16 and the third mixing chamber 17. The return air duct 7, the first fresh air duct 9, and the second fresh air duct 10 are respectively connected to the return air chamber 14, the first mixing chamber 15, and the second mixing chamber 16, with return air entering from the return air duct 7. After the second mixing zone 4, the air enters the first mixing chamber 15 and the second mixing chamber 16 at the corresponding positions through the arc-shaped cavity plates 11. The return air is initially mixed with the fresh air in the first mixing chamber 15 and the second mixing chamber 16, and then enters the third mixing chamber 17 at the corresponding position through the arc-shaped cavity plates 11 to achieve a second mixing. The cooperation between the arc-shaped cavity plates 11 and the air guide holes 13 can change the air direction and disperse the air to the greatest extent. This avoids the problem that most of the fresh air and return air flow towards the outlet direction of the air supply duct 8 at the corresponding position due to inertia. Without increasing the structural complexity and equipment such as fans, the mixing efficiency and uniformity are improved.

[0043] The arc-shaped cavity plate 11, together with the return air duct 7 and the mixing box 2, forms a return air cavity 14; the arc-shaped cavity plate 11, together with the first fresh air duct 9 and the mixing box 2, forms a first mixing air cavity 15; the arc-shaped cavity plate 11, together with the second fresh air duct 10 and the mixing box 2, forms a second mixing air cavity 16; and the arc-shaped cavity plate 11, together with the partition plate 6 and the mixing box 2, forms a third mixing air cavity 17. The arc-shaped cavity plate 11 is diagonally positioned, abutting against the mixing box 2 and the cylindrical baffle 12. It is concave on the return air cavity 14 side and convex on the second mixing air cavity 16 side, thus increasing the area of ​​the third mixing air cavity 17 within a given space, thereby improving mixing efficiency. After the return air is split, it is mixed once with the fresh air in the first mixing air cavity 15 and the second mixing air cavity 16, and then mixed a second time in the third mixing air cavity 17, improving the mixing uniformity.

[0044] Specifically, a cylindrical baffle 12 is provided inside the mixing chamber 2; one end of each of the four arc-shaped cavity plates 11 is connected to the cylindrical baffle 12, and the other end is connected to the inner wall of the mixing chamber 2. Through the arc-shaped mechanism of the arc-shaped cavity plates 11, in conjunction with the arc-shaped mechanism on the surface of the cylindrical baffle 12, the degree of disorder of the air direction at different locations in the return air duct 7, the first fresh air duct 9, and the second fresh air duct 10 is further improved by changing the airflow direction, thereby improving the mixing effect and uniformity.

[0045] The arc-shaped cavity plate 11 and the partition plate 6 are provided with air guide holes 13. The airflow is divided into multiple streams by the air guide holes 13, so that the fresh air and return air are mixed in a dispersed manner, improving the mixing uniformity. Specifically, multiple air guide holes 13 are evenly provided on the arc-shaped cavity plate 11; in the mixing box 2, the convex sides of two symmetrical arc-shaped cavity plates 11 face the return air duct 7, and the convex sides of the other two symmetrical arc-shaped cavity plates 11 face the first fresh air duct 9 and the second fresh air duct 10, respectively. The return air entering through the return air duct 7 is dispersed on the convex side of the arc-shaped cavity plate 11 and then enters the first fresh air duct 9 and the second fresh air duct 10 through the air guide holes 13 at different positions. The mixed air that undergoes the first mixing in the first fresh air duct 9 and the second fresh air duct 10 is dispersed again on the convex side of the arc-shaped cavity plate 11 and then enters the third mixing chamber 17 through the air guide holes 13 at different positions, thus maximizing the mixing effect of the return air and the first mixed air.

[0046] like Figure 2 and Figure 3 As shown, the second mixing zone 4 includes at least one mixer 18 having a plurality of generally rectangular louver assemblies 19 arranged in a rectangular array in the frame 20 in rows and columns configured horizontally and vertically, with at least two louver assemblies 19 directing air flowing toward the mixing system outlet to the laterally adjacent louver assembly 19.

[0047] Each venetian blind assembly 19 has at least two blades 21, each blade 21 having a leading edge portion 22 and a trailing edge portion 23, and a respective deflection surface 24 therebetween. The longitudinal axes of the blades 21 in each venetian blind assembly 19 are generally parallel, and their surfaces are spaced apart from adjacent blades 21 to allow gas flow. The longitudinal axes of the blades 21 in the venetian blind assembly 19 are generally perpendicular to the longitudinal axes of the blades 21 in the adjacent venetian blind assembly 19, and are generally parallel to the longitudinal axes of the blades 21 in the diagonally positioned venetian blind assembly 19, to generate vortex airflow around the central axis of the venetian blind assembly 19 on the outlet side, which enhances the contact and mixing of hot and cold airflows during rotation.

[0048] like Figure 3 As shown, the mixer 18 includes a frame 20 and a plurality of louver assemblies 19 disposed within the frame 20; each louver assembly 19 has at least two blades 21; every four louver assemblies 19 form a group, and the blades 21 in each group of louver assemblies 19 are inclined in a clockwise direction of airflow. The inclination of the blades in each group of louver assemblies 19 in a clockwise direction of airflow generates an overall vortex airflow on the central axis of the outlet side frame 20, and also generates a local vortex airflow on the central axis of each group of louver assemblies 19. The combination of the local vortex airflow and the overall vortex airflow greatly improves the contact and mixing effect of the return air and the fresh airflow.

[0049] The return air duct 7, the first fresh air duct 9, and the second fresh air duct 10 are all equipped with electrically adjustable dampers 25. The default opening of each electrically adjustable damper 25 is 100% to ensure maximum airflow when no adjustment is required. Temperature and humidity sensors 26 are installed in the return air duct 7, the supply air duct 8, the first fresh air duct 9, and the second fresh air duct 10. An air velocity sensor 27 is installed in the supply air duct 8. The controller 1 is connected to the variable frequency fan 5, each electrically adjustable damper 25, each temperature and humidity sensor 26, and the air velocity sensor 27. The controller adjusts the opening of the electrically adjustable dampers 25 in real time using the temperature and humidity sensors 26 to regulate the return air to fresh air ratio and supply air temperature, thereby improving airflow comfort. The controller adjusts the frequency of the variable frequency fan 5 in real time using the air velocity sensor 27 to regulate the supply airflow.

[0050] Specifically, the control process implemented by the controller 1 in this embodiment is as follows:

[0051] When controlling the supply air temperature: when the detected values ​​of the temperature and humidity sensors 26 at the first fresh air duct 9 and the second fresh air duct 10 are higher than the detected values ​​of the temperature and humidity sensors 26 at the return air duct 7: if the detected value of the temperature and humidity sensor 26 at the supply air duct 8 is higher than the first temperature set value, the opening degree of the electric regulating damper 25 at the first fresh air duct 9 and the second fresh air duct 10 is reduced; if the detected value of the temperature and humidity sensor 26 at the supply air duct 8 is lower than the first temperature set value, the opening degree of the electric regulating damper 25 at the return air duct 7 is reduced.

[0052] When the temperature and humidity sensor 26 values ​​detected at the first fresh air duct 9 and the second fresh air duct 10 are lower than the temperature and humidity sensor 26 values ​​detected at the return air duct 7: if the temperature and humidity sensor 26 value detected at the supply air duct 8 is higher than the second temperature setting value, the opening of the electric regulating damper 25 at the return air duct 7 is reduced; if the temperature and humidity sensor 26 value detected at the supply air duct 8 is lower than the second temperature setting value, the opening of the electric regulating damper 25 at the first fresh air duct 9 and the second fresh air duct 10 is reduced.

[0053] When controlling the air supply volume: if the wind speed sensor 27 at the air supply duct 8 detects a value higher than the temperature set value, reduce the operating frequency of the variable frequency fan 5 and decrease the air supply volume; if the wind speed sensor 27 at the air supply duct 8 detects a value lower than the temperature set value, increase the operating frequency of the variable frequency fan 5 and increase the air supply volume.

[0054] The return air duct 7, the first fresh air duct 9, and the second fresh air duct 10 can be replaced with a fresh air duct, a first return air duct, and a second return air duct, depending on the actual installation environment and the fresh air / return air ratio requirements.

[0055] Example 2:

[0056] This embodiment provides an air mixing method using the air mixing device described in Embodiment 1, comprising: after return air enters the return air chamber 14 from the return air duct 7, it enters the first mixing chamber 15 and the second mixing chamber 16 respectively through the arc-shaped cavity plate 11 at the corresponding position; after the return air is initially mixed with fresh air in the first mixing chamber 15 and the second mixing chamber 16 respectively, it enters the third mixing chamber 17 through the arc-shaped cavity plate 11 at the corresponding position to achieve a second mixing; after the air in the third mixing chamber 17 enters the second mixing zone 4, it passes through the mixer 18 to achieve a third mixing.

[0057] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. An air mixing device, characterized in that, It includes a mixing box (2), a return air duct (7) and a supply air duct (8) respectively disposed at both ends of the mixing box (2), and a first fresh air duct (9) and a second fresh air duct (10) symmetrically disposed on the side wall of the mixing box (2); the mixing box (2) includes a first mixing zone (3) and a second mixing zone (4), and a partition (6) is disposed between the first mixing zone (3) and the second mixing zone (4); The first mixing zone (3) includes a return air chamber (14), a first mixing air chamber (15), a second mixing air chamber (16), and a third mixing air chamber (17); an arc-shaped cavity plate (11) with air guide holes (13) is provided between the return air chamber (14) and the first mixing air chamber (15), between the return air chamber (14) and the second mixing air chamber (16), between the first mixing air chamber (15) and the third mixing air chamber (17), and between the second mixing air chamber (16) and the third mixing air chamber (17); a mixer (18) is provided in the second mixing zone (4). The return air duct (7), the first fresh air duct (9), and the second fresh air duct (10) are respectively connected to the return air chamber (14), the first mixing chamber (15), and the second mixing chamber (16); the third mixing chamber (17) is connected to the second mixing zone (4) through the partition (6); Temperature and humidity sensors (26) are installed on the return air duct (7), the supply air duct (8), the first fresh air duct (9), and the second fresh air duct (10); electric regulating valves (25) are installed on the return air duct (7), the first fresh air duct (9), and the second fresh air duct (10); wind speed sensors (27) are installed on the supply air duct (8); the temperature and humidity sensors (26), the electric regulating valves (25), and the wind speed sensors (27) are all connected to a controller (1); the controller (1) is used to control the supply air temperature and the supply air volume. The controller (1) is configured to: when controlling the supply air temperature: when the detection values ​​of the temperature and humidity sensors (26) at the first fresh air duct (9) and the second fresh air duct (10) are higher than the detection values ​​of the temperature and humidity sensors (26) at the return air duct (7): if the detection value of the temperature and humidity sensor (26) at the supply air duct (8) is higher than the first temperature setting value, reduce the opening of the electric regulating valve (25) at the first fresh air duct (9) and the second fresh air duct (10); if the detection value of the temperature and humidity sensor (26) at the supply air duct (8) is lower than the first temperature setting value, reduce the opening of the electric regulating valve (25) at the return air duct (7).

2. An air mixing device as described in claim 1, characterized in that, The mixing box (2) is provided with a cylindrical baffle (12); one end of the four arc-shaped cavity plates (11) is connected to the cylindrical baffle (12), and the other end is connected to the inner wall of the mixing box (2).

3. An air mixing device as described in claim 1, characterized in that, The first mixing chamber (15) and the second mixing chamber (16) are symmetrical about the axis of the mixing box (2), and the first fresh air duct (9) and the second fresh air duct (10) are symmetrical about the axis of the mixing box (2).

4. An air mixing device as described in claim 3, characterized in that, The arc-shaped cavity plate (11) is provided with a plurality of air guide holes (13).

5. An air mixing device as described in claim 4, characterized in that, Inside the mixing box (2), the raised sides of two symmetrical arc-shaped cavity plates (11) face the return air duct (7), and the raised sides of the other two symmetrical arc-shaped cavity plates (11) face the first fresh air duct (9) and the second fresh air duct (10), respectively.

6. An air mixing device as described in claim 1, characterized in that, A variable frequency fan (5) is installed inside the mixing box (2) at the position between the mixer (18) and the air supply duct (8).

7. An air mixing device as described in claim 6, characterized in that, The controller (1) is configured to: when the temperature and humidity sensor (26) values ​​detected at the first fresh air duct (9) and the second fresh air duct (10) are lower than the temperature and humidity sensor (26) values ​​detected at the return air duct (7): if the temperature and humidity sensor (26) value detected at the supply air duct (8) is higher than the second temperature setting value, reduce the opening of the electric regulating valve (25) at the return air duct (7); if the temperature and humidity sensor (26) value detected at the supply air duct (8) is lower than the second temperature setting value, reduce the opening of the electric regulating valve (25) at the first fresh air duct (9) and the second fresh air duct (10). When controlling the air supply volume: if the wind speed sensor (27) at the air supply duct (8) detects a value higher than the temperature set value, reduce the operating frequency of the variable frequency fan (5) and reduce the air supply volume; if the wind speed sensor (27) at the air supply duct (8) detects a value lower than the temperature set value, increase the operating frequency of the variable frequency fan (5) and increase the air supply volume.

8. An air mixing device as described in claim 1, characterized in that, The mixer (18) includes a frame (20) and a plurality of louver assemblies (19) disposed within the frame (20); each louver assembly (19) is provided with at least two blades (21); every four louver assemblies (19) form a group, and the blades (21) in each group of louver assemblies (19) are inclined in a clockwise air outlet direction.

9. An air mixing method, characterized in that, The air mixing device as described in any one of claims 1-8 is used, comprising: after the return air enters the return air chamber (14) from the return air duct (7), it enters the first mixing chamber (15) and the second mixing chamber (16) respectively through the arc-shaped cavity plate (11) at the corresponding position; after the return air is initially mixed with the fresh air in the first mixing chamber (15) and the second mixing chamber (16), it enters the third mixing chamber (17) through the arc-shaped cavity plate (11) at the corresponding position to achieve a second mixing; after the air in the third mixing chamber (17) enters the second mixing zone (4), it passes through the mixer (18) to achieve a third mixing.

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