Air mixing device and method

Abstract

The invention belongs to the technical field of air conditioning, and provides an air mixing device and method.The air mixing device is characterized in that an air return pipeline, a first fresh air pipeline and a second fresh air pipeline communicate with an air return cavity, a first air mixing cavity and a second air mixing cavity correspondingly; the return air enters the first air mixing cavity and the second air mixing cavity through the arc-shaped cavity plates at the corresponding positions, the return air is preliminarily mixed with the fresh air in the first air mixing cavity and the second air mixing cavity and then enters the third air mixing cavity through the arc-shaped cavity plates at the corresponding positions, secondary mixing is achieved, and the arc-shaped cavity plates are matched with the air guide holes, so that secondary mixing is achieved. The air direction can be changed and the air can be dispersed to the maximum extent, the problem that most fresh air and return air flow to the outlet direction of the air supply pipeline according to the air direction when entering the cavity under the inertia effect is avoided, and the mixing efficiency and uniformity are improved on the basis that the structural complexity and equipment such as a fan are not increased; and meanwhile, a blender is arranged in the second air mixing area, so that the uniformity is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to an air mixing device and method. Background Art

[0002] In modern buildings and industrial environments, air conditioning systems are a key component in maintaining indoor environmental comfort. Traditional air mixing devices usually use a simple mixing method and lack fine control over airflow dynamics, resulting in low mixing efficiency and uneven mixing, which affects air quality and comfort.

[0003] At present, the main reason for the low mixing efficiency and uneven mixing of the air mixing device structure is that after a large amount of fresh air and return air with a certain flow direction enter the mixing chamber, although a part of the fresh air and return air are mixed by changing the wind direction, most of the fresh air and return air still flow to the air supply outlet direction of the air mixing device according to the wind direction when entering the chamber under the action of inertia, and the mixing uniformity is poor; the mixing efficiency and uniformity can be improved by increasing the structural complexity of the air mixing device or adding a fan, but the cost is increased. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes an air mixing device and method. 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 respectively through the arc cavity plates at the corresponding positions. After the return air is preliminarily mixed with the fresh air in the first mixing chamber and the second mixing chamber respectively, it enters the third mixing chamber through the arc cavity plates at the corresponding positions to achieve the second mixing. The cooperation of the arc cavity plates and the air guide holes can change the wind direction and disperse the wind to the greatest extent, avoiding the problem that most of the fresh air and return air flow toward the outlet direction of the air supply duct according to the wind direction when entering the chamber under the action of inertia. Without increasing the structural complexity and equipment such as the fan, the mixing efficiency and uniformity are improved. At the same time, a blender is provided in the second mixing area to achieve the purpose of the third mixing and further improve the mixing uniformity.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present invention provides an air mixing device, which adopts the following technical solution:

[0006] An air mixing device, comprising an air mixing box, a return air duct and an air supply duct respectively arranged at two ends of the air mixing box, and a first fresh air duct and a second fresh air duct symmetrically arranged on a side wall of the air mixing box; the air mixing box comprises a first air mixing area and a second air mixing area, and a partition is arranged between the first air mixing area and the second air mixing area;

[0007] The first air mixing zone includes a return air chamber, a first air mixing chamber, a second air mixing chamber and a third air mixing chamber; an arc-shaped cavity plate with air guide holes is arranged between the return air chamber and the first air mixing chamber, between the return air chamber and the second air mixing chamber, between the first air mixing chamber and the third air mixing chamber, and between the second air mixing chamber and the third air mixing chamber; a blender is arranged in the second air 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 air mixing chamber and the second air mixing chamber; the third air mixing chamber is connected to the second air mixing area through the partition.

[0009] Furthermore, a cylindrical baffle is provided in the air 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 air mixing box.

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

[0011] Furthermore, a plurality of air guide holes are evenly arranged on the arc-shaped cavity plate.

[0012] Furthermore, in the air mixing box, 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.

[0013] Furthermore, a variable frequency fan is provided in the air mixing box at a position between the mixer and the air supply duct; the return air duct, the supply air duct, the first fresh air duct and the second fresh air duct are all provided with temperature and humidity sensors; the return air duct, the first fresh air duct and the second fresh air duct are all provided with electric regulating air valves; the air supply duct is provided with a wind speed sensor; the temperature and humidity sensor, the electric regulating air valve and the wind speed sensor are all connected to a controller; the controller is used to control the supply air temperature and the supply air volume.

[0014] Furthermore, the controller is configured to: when controlling the supply air temperature: when the detection values ​​of the temperature and humidity sensors at the first fresh air duct and the second fresh air duct are higher than the detection values ​​of the temperature and humidity sensors at the return air duct: if the detection values ​​of the temperature and humidity sensors at the supply air duct are higher than the first temperature setting value, reduce the opening of the electric regulating air valve at the first fresh air duct and the second fresh air duct; if the detection values ​​of the temperature and humidity sensors at the supply air duct are lower than the first temperature setting value, reduce the opening of the electric regulating air valve at the return air duct.

[0015] Further, the controller is configured to: when the detection values ​​of the temperature and humidity sensors at the first fresh air duct and the second fresh air duct are lower than the detection values ​​of the temperature and humidity sensors at the return air duct: if the detection value of the temperature and humidity sensors at the supply air duct is higher than the second temperature setting value, reduce the opening of the electric regulating air valve at the return air duct; if the detection value of the temperature and humidity sensors at the supply air duct is lower than the second temperature setting value, reduce the opening of the electric regulating air valve at the first fresh air duct and the second fresh air duct;

[0016] When controlling the air supply volume: if the detection value of the wind speed sensor at the air supply duct is higher than the temperature setting value, reduce the operating frequency of the variable frequency fan and adjust the air supply volume; if the detection value of the wind speed sensor at the air supply duct is lower than the temperature setting value, increase the operating frequency of the variable frequency fan and increase the air supply volume.

[0017] Furthermore, the blender includes a frame, and a plurality of shutter assemblies arranged in the frame; at least two blades are arranged in the shutter assembly; every four shutter assemblies form a group, and the blades in each group of shutter assemblies are tilted in a clockwise air outlet direction.

[0018] In order to achieve the above object, in a second aspect, the present invention further provides an air mixing method, which adopts the following technical solution:

[0019] An air mixing method uses the air mixing device as described in the first aspect, including: after the return air enters the return air chamber from the return air duct, it enters the first air mixing chamber and the second air mixing chamber respectively through the arc cavity plates at corresponding positions; after the return air is preliminarily mixed with the fresh air in the first air mixing chamber and the second air mixing chamber respectively, it enters the third air mixing chamber through the arc cavity plates at corresponding positions to achieve a second mixing; after the air in the third air mixing chamber enters the second air mixing area, it passes through the blender to achieve a third mixing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention divides the air mixing box into a first air mixing area and a second air mixing area. The first air mixing area includes a return air chamber, a first air mixing chamber, a second air mixing chamber and a third air mixing chamber. An arc-shaped cavity plate with air guide holes is arranged between the return air chamber and the first air mixing chamber, between the return air chamber and the second air mixing chamber, between the first air mixing chamber and the third air mixing chamber, and between the second air mixing chamber and the third air 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 mixed air chamber and the second mixed air chamber. After the return air enters the return air chamber from the return air duct, it enters the first mixed air chamber and the second mixed air chamber through the arc-shaped cavity plates at corresponding positions. After the return air is preliminarily mixed with the fresh air in the first mixing chamber and the second mixing chamber, it enters the third mixing chamber through the arc chamber plate at the corresponding position to achieve the second mixing. The cooperation of the arc chamber plate and the air guide hole can change the wind direction and disperse the wind to the greatest extent, avoiding the problem that most of the fresh air and return air flow to the outlet direction of the air supply duct according to the wind direction when entering the chamber under the action of inertia. On the basis of not increasing the structural complexity and equipment such as fans, the mixing efficiency and uniformity are improved; at the same time, a blender is provided in the second mixing area to achieve the purpose of the third mixing and further improve the mixing uniformity.

[0022] 2. The present invention uses the arc structure of the arc cavity plate in coordination with the arc structure on the surface of the cylindrical baffle plate to change the wind direction, thereby further improving the degree of confusion of wind directions at different positions in the return air duct, the first fresh air duct and the second fresh air duct, thereby improving the mixing effect and uniformity.

[0023] 3. In the present invention, the first air mixing chamber and the second air 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, and the respective proportions of the fresh air and the return air during mixing are guaranteed as much as possible, and the consistency of the mixing condition of the mixed air entering the third air mixing chamber is guaranteed, thereby improving the uniformity of the overall mixed air.

[0024] 4. In the present invention, a plurality of air guide holes are evenly arranged on the arc cavity plate; the convex sides of two symmetrical arc cavity plates face the return air duct, and the convex sides of the other two symmetrical arc 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 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 cavity plate, and then enters the third mixing air chamber through the air guide holes at different positions, thereby ensuring the mixing effect of the return air and the first mixed air to the greatest extent.

[0025] 5. In the present invention, the temperature and humidity sensor is used to detect the value in real time, and the opening of the electric regulating air valve is adjusted according to the detected value to adjust the return air and fresh air ratio, the supply air temperature, and improve the comfort of the supply air; the wind speed sensor is used to detect the value in real time, and the frequency of the variable frequency fan is adjusted according to the detected value to accurately control the supply air volume.

[0026] 6. In the present invention, the leaves in each group of shutter assemblies are tilted in a clockwise direction of air outlet, so that an overall vortex airflow is generated on the central axis of the outlet side frame, and a local vortex airflow is generated on the central axis of each group of shutter assemblies. The coordination of the local vortex airflow and the overall vortex airflow greatly improves the contact and mixing effect of the return air and the fresh air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

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

[0029] Figure 2 Schematic diagram of a blender according to Example 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the vortex flow direction of the blender of Example 1 of the present invention;

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

[0032] Among them, 1. controller; 2. air mixing box; 3. first air mixing zone; 4. second air 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 cavity plate; 12. cylindrical baffle; 13. air guide hole; 14. return air cavity; 15. first air mixing cavity; 16. second air mixing cavity; 17. third air mixing cavity; 18. blender; 19. shutter assembly; 20. frame; 21. blades; 22. leading edge part; 23. trailing edge part; 24. deflection surface; 25. electric regulating air valve; 26. temperature and humidity sensor; 27. wind speed sensor. DETAILED DESCRIPTION

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

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0035] Embodiment 1:

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

[0037] The two ends of the air mixing box 2 are respectively provided with a return air duct 7 and an air supply duct 8. In the air mixing box 2, along the direction from the return air duct 7 to the air supply duct 8, a partition 6, a blender 18 and a variable frequency fan 5 are sequentially provided. The partition 6 and the inner wall of the air mixing box 2 near one end of the return air duct 7 constitute a first air mixing area 3; the partition 6 and the inner wall of the air mixing box 2 near one end of the air supply duct 8 constitute a second air mixing area 4.

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

[0039] A cylindrical baffle 12 is provided in the first air mixing area 3, and four arc-shaped cavity plates 11 are connected between the cylindrical baffle 12 and the inner wall of the air mixing box 2. The four arc-shaped cavity plates 11 divide the first air mixing area 3 into a return air cavity 14, a first air mixing cavity 15, a second air mixing cavity 16 and a third air mixing cavity 17; the return air duct 7 is connected to the return air cavity 14; the first fresh air duct 9 is connected to the first air mixing cavity 15, and the second fresh air duct 10 is connected to the second air mixing cavity 16; the third air mixing cavity 17 is close to the partition 6. The arc-shaped cavity plates 11 are provided with air guide holes 13.

[0040] Optionally, a return air duct 7 is provided at the center of one end of the air mixing box 2, and an air supply duct 8 is provided at the center of the other end. The axes of the return air duct 7 and the air supply duct 8 are arranged along the first direction. The return air 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 arranged symmetrically with respect to the axis of the return air duct 7, and the axes of the first fresh air duct 9 and the second fresh air duct 10 are arranged along the second direction, and the second direction is perpendicular to the first direction. The air volume of the first fresh air duct 9 and the air volume of the second fresh air duct 10 are usually equal to ensure the uniformity of the mixed air. The first air mixing area 3 is provided with an arc cavity plate 11 and a cylindrical baffle 12. The cylindrical baffle 12 guides the return air and the fresh air airflow to form an arc flow path, thereby enhancing the mixing effect of the two.

[0042] Specifically, the air mixing box 2 is divided into the first air mixing area 3 and the second air mixing area 4, the first air mixing area 3 includes the return air chamber 14, the first air mixing chamber 15, the second air mixing chamber 16 and the third air mixing chamber 17; an arc-shaped cavity plate 11 with air guide holes 13 is provided between the return air chamber 14 and the first air mixing chamber 15, between the return air chamber 14 and the second air mixing chamber 16, between the first air mixing chamber 15 and the third air mixing chamber 17, and between the second air mixing chamber 16 and the third air 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 fresh air duct 15 and the second fresh air duct 16, and the return air enters from the return air duct 7 After the second air mixing zone 4, the return air enters the first air mixing chamber 15 and the second air mixing chamber 16 at the corresponding position respectively through the arc cavity plate 11 at the corresponding position. After the return air is preliminarily mixed with the fresh air in the first air mixing chamber 15 and the second air mixing chamber 16 at the corresponding position, it enters the third air mixing chamber 17 at the corresponding position through the arc cavity plate 11 at the corresponding position to achieve the second mixing. The cooperation of the arc cavity plate 11 at the corresponding position and the air guide hole 13 at the corresponding position can change the wind direction and disperse the wind to the greatest extent, avoiding the problem that most of the fresh air and return air, under the action of inertia, flow to the outlet direction of the air supply duct 8 at the corresponding position according to the wind direction when entering the chamber, thereby improving the mixing efficiency and uniformity without increasing the structural complexity and equipment such as the fan.

[0043] The arc cavity plate 11, the return air duct 7 and the air mixing box 2 form a return air cavity 14. The arc cavity plate 11, the first fresh air duct 9 and the air mixing box 2 form a first air mixing cavity 15. The arc cavity plate 11, the second fresh air duct 10 and the air mixing box 2 form a second air mixing cavity 16. The arc cavity plate 11, the partition plate 6 and the air mixing box 2 form a third air mixing cavity 17. The arc cavity plate 11 is in a diagonal line, abutting the air mixing box 2 and the cylindrical baffle 12. It is concave on the return air cavity 14 side and convex on the second air mixing cavity 16 side, so that the area of ​​the third air mixing cavity 17 is increased under a certain space, thereby improving the air mixing efficiency. After the return air is split, it is mixed with the fresh air once in the first air mixing cavity 15 and the second air mixing cavity 16 respectively, and then mixed twice in the third air mixing cavity 17 to improve the mixing uniformity.

[0044] Specifically, a cylindrical baffle 12 is provided in the air mixing box 2; one end of 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 air mixing box 2. By changing the wind direction through the arc-shaped mechanism of the arc-shaped cavity plate 11 and the arc-shaped mechanism on the surface of the cylindrical baffle 12, the disorder degree of the wind direction at different positions in the return air duct 7, the first fresh air duct 9 and the second fresh air duct 10 is further improved, and the mixing effect and uniformity are improved.

[0045] The arc-shaped cavity plate 11 and the partition plate 6 are provided with air guide holes 13, and the airflow is divided into multiple streams by the air guide holes 13, so that the fresh air and the return air are dispersedly mixed to improve the mixing uniformity. Specifically, the arc-shaped cavity plate 11 is evenly provided with multiple air guide holes 13; in the air 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 from 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 is mixed for the first time 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 air cavity 17 through the air guide holes 13 at different positions, thereby ensuring the mixing effect of the return air and the first mixed air to the greatest extent.

[0046] like Figure 2 and Figure 3 As shown, the second air mixing zone 4 includes at least one blender 18, and the blender 18 has a plurality of generally rectangular louver assemblies 19, and the louver assemblies 19 are arranged in a rectangular array in a frame 20, and are located in rows and columns configured horizontally and vertically, and at least two louver assemblies 19 guide the air flowing to the outlet side of the mixing system to the louver assemblies 19 that are laterally adjacent.

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

[0048] like Figure 3 As shown, the blender 18 includes a frame 20, and a plurality of shutter assemblies 19 disposed in the frame 20; at least two blades 21 are disposed in the shutter assembly 19; each group of four shutter assemblies 19 is tilted in a clockwise direction of air flow. The blades in each group of shutter assemblies 19 are tilted in a clockwise direction of air flow, so that an overall vortex airflow is generated on the central axis of the outlet side frame 20, and a local vortex airflow is generated on the central axis of each group of shutter assemblies 19. The coordination of the local vortex airflow and the overall vortex airflow greatly improves the contact and mixing effect of the return air and the fresh air flow.

[0049] The return air duct 7, the first fresh air duct 9 and the second fresh air duct 10 are all provided with an electric regulating air valve 25; the default opening of the electric regulating air valve 25 is 100% to ensure that the air flow is at the maximum state when there is no adjustment demand. The return air duct 7, the first fresh air duct 9 and the second fresh air duct 10 of the supply air duct 8 are all provided with a temperature and humidity sensor 26. The supply air duct 8 is provided with a wind speed sensor 27. The controller 1 is connected to the variable frequency fan 5, each electric regulating air valve 25, each temperature and humidity sensor 26 and the wind speed sensor 27. The temperature and humidity sensor 26 detects the value in real time to adjust the opening of the electric regulating air valve 25 to adjust the return air and fresh air ratio, the supply air temperature, and improve the comfort of the supply air; the wind speed sensor 27 detects the value in real time to adjust the frequency of the variable frequency fan 5 to adjust the supply air volume.

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

[0051] When the supply air temperature is controlled: when the detection value of the temperature and humidity sensor 26 at the first fresh air duct 9 and the second fresh air duct 10 is higher than the detection value of the temperature and humidity sensor 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, the opening of the electric regulating air valve 25 at the first fresh air duct 9 and the second fresh air duct 10 is reduced; 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, the opening of the electric regulating air valve 25 at the return air duct 7 is reduced;

[0052] 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 lower 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 sensors 26 at the supply air duct 8 is higher than the second temperature setting value, the opening of the electric regulating air valve 25 at the return air duct 7 is reduced; if the detection value of the temperature and humidity sensors 26 at the supply air duct 8 is lower than the second temperature setting value, the opening of the electric regulating air valve 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 detection value of the wind speed sensor 27 at the air supply duct 8 is higher than the temperature setting value, reduce the operating frequency of the variable frequency fan 5 and adjust the air supply volume; if the detection value of the wind speed sensor 27 at the air supply duct 8 is lower than the temperature setting 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 according to the actual installation environment and the fresh air and return air ratio requirements.

[0055] Embodiment 2:

[0056] The present embodiment provides an air mixing method, using the air mixing device as described in Embodiment 1, including: after the return air enters the return air chamber 14 from the return air duct 7, it enters the first air mixing chamber 15 and the second air mixing chamber 16 respectively through the arc cavity plates 11 at corresponding positions; after the return air is preliminarily mixed with the fresh air in the first air mixing chamber 15 and the second air mixing chamber 16 respectively, it enters the third air mixing chamber 17 through the arc cavity plates 11 at corresponding positions to achieve a second mixing; after the air in the third air mixing chamber 17 enters the second air mixing area 4, it passes through the blender 18 to achieve a third mixing.

[0057] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. An air mixing device, characterized in that: The air mixing box (2) comprises a return air duct (7) and an air supply duct (8) respectively arranged at two ends of the air mixing box (2), and a first fresh air duct (9) and a second fresh air duct (10) symmetrically arranged on the side wall of the air mixing box (2); the air mixing box (2) comprises a first air mixing area (3) and a second air mixing area (4), and a partition plate (6) is arranged between the first air mixing area (3) and the second air mixing area (4); The first air mixing zone (3) comprises a return air chamber (14), a first air mixing chamber (15), a second air mixing chamber (16) and a third air mixing chamber (17); an arc-shaped chamber plate (11) with air guide holes (13) is provided between the return air chamber (14) and the first air mixing chamber (15), between the return air chamber (14) and the second air mixing chamber (16), between the first air mixing chamber (15) and the third air mixing chamber (17), and between the second air mixing chamber (16) and the third air mixing chamber (17); a blender (18) is provided in the second air 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 air mixing chamber (15) and the second air mixing chamber (16); the third air mixing chamber (17) is connected to the second air mixing area (4) through the partition (6).

2. An air mixing device as claimed in claim 1, characterized in that: A cylindrical baffle (12) is arranged inside the air mixing box (2); one end of 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 air mixing box (2).

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

4. An air mixing device as claimed in claim 3, characterized in that: A plurality of air guide holes (13) are evenly arranged on the arc-shaped cavity plate (11).

5. An air mixing device as claimed in claim 4, characterized in that: In the air 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.

6. An air mixing device as claimed in claim 1, characterized in that: A variable frequency fan (5) is provided in the mixing box (2) at a position between the blender (18) and the air supply duct (8); a temperature and humidity sensor (26) is provided on the return air duct (7), the air supply duct (8), the first fresh air duct (9) and the second fresh air duct (10); an electric regulating air valve (25) is provided on the return air duct (7), the first fresh air duct (9) and the second fresh air duct (10); a wind speed sensor (27) is provided on the air supply duct (8); the temperature and humidity sensor (26), the electric regulating air valve (25) and the wind speed sensor (27) are all connected to a controller (1); the controller (1) is used to control the supply air temperature and the supply air volume.

7. An air mixing device as claimed in claim 6, characterized in that: The controller (1) is configured to: when controlling the supply air temperature: when the detection value of the temperature and humidity sensor (26) at the first fresh air duct (9) and the second fresh air duct (10) is higher than the detection value of the temperature and humidity sensor (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 air 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 air valve (25) at the return air duct (7).

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

9. An air mixing device as claimed in claim 1, characterized in that: The blender (18) comprises a frame (20) and a plurality of shutter assemblies (19) arranged in the frame (20); at least two blades (21) are arranged in the shutter assemblies (19); every four shutter assemblies (19) form a group, and the blades (21) in each group of shutter assemblies (19) are arranged to be inclined in a clockwise air outlet direction.

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

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