Air return flow channel structure of drying box
By employing a cylindrical return air chamber and a two-stage air supply system in the drying oven, the problem of high energy consumption in the return air circulation system was solved, achieving uniform mixing of return air and precise control of temperature and humidity, thereby improving the conductivity and surface quality of the copper foil.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TITANIUM (SUZHOU) TECHNOLOGY CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-22
Smart Images
Figure CN224266655U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of copper foil production equipment, and more specifically, to a return air channel structure for a drying oven. Background Technology
[0002] In the copper foil production process, after the copper foil stripped from the cathode roller is immersed in an anti-oxidation tank, excessive anti-oxidation solution residue easily adheres to its surface. If this residue is not effectively removed, it will not only cause oxidation on the copper foil surface, leading to quality deterioration, but will also form interface contamination in subsequent surface treatment processes, directly affecting key indicators such as the copper foil's conductivity and peel strength. Especially in the field of high-precision electronic circuit copper foil manufacturing, the organic components in the residual solution are prone to carbonization at high temperatures, forming an insulating layer, which will significantly increase the sheet resistance of the copper foil and seriously affect the electrical signal transmission performance of the end product.
[0003] The closest existing drying oven to this application is the one authorized by publication number CN211876554U, which is a secondary circulation system for hot exhaust gas in a dryer. Air enters the hot air furnace through the air inlet and is heated to the required temperature. After reaching the required temperature, the air enters the drying oven through the hot air outlet and the hot air inlet pipe. After drying, the hot exhaust gas containing water vapor is discharged through the hot exhaust gas pipe. The hot exhaust gas enters the condenser from the hot exhaust gas pipe. Under the action of the condenser fan, the water vapor is condensed into liquid and discharged through the drain pipe. The dehumidified hot exhaust gas is output from the recovered hot gas outlet and enters the hot air furnace for recycling through the recovered hot gas pipe.
[0004] The drying oven described above can only achieve air recirculation, but it cannot control the air recirculation process or achieve high air quality, which results in high energy consumption.
[0005] In view of this, the present invention provides a drying oven return air channel structure with low energy consumption and good return air effect. Utility Model Content
[0006] The purpose of this invention is to propose a dryer return air channel structure that has low energy consumption and good return air effect.
[0007] A return airflow channel structure for a drying oven, characterized in that it comprises:
[0008] The upper drying box module 1 and the lower drying box module 2 form a feeding chamber surface 3 between them for conveying materials;
[0009] The upper drying chamber module 1 is provided with a first air inlet chamber 11, a first flow equalization chamber 12, and a first return air chamber 13 from top to bottom; the lower drying chamber module 2 is provided with a second air inlet chamber 21, a second flow equalization chamber 22, and a second return air chamber 23 from bottom to top. The pressure in the first return air chamber 13 and the second return air chamber 23 is lower than the external ambient pressure, allowing external cold air to enter the return air chamber from the inlet or outlet of the feed chamber surface 3 and mix with the high-temperature return air. The first return air chamber 13 and the second return air chamber 23 are return air chambers with cylindrical, polygonal, or trapezoidal cross-sections.
[0010] A cylindrical return air chamber is preferred, as it increases the internal circumferential area, reduces vortices and temperature unevenness, and allows for a more uniform mixing of hot return air and external cold air. Firstly, the cylindrical chamber's uniform circumference and absence of sharp corners and dead zones, compared to square or polygonal chambers, significantly reduces vortices and backflow zones formed at the corners. When external cold air mixes with hot return air in this chamber, the airflow is relatively stable and smooth, reducing turbulence and contributing to a more uniform airflow and temperature distribution at the return air outlet. Secondly, the cylindrical chamber's continuous curved wall provides a larger ratio of inner wall area to internal volume, facilitating the uniformity of heat and humidity exchange and transfer. For the mixing of hot and cold air, a longer cylindrical chamber... Both the contact time and the large circumferential contact area help achieve uniform mixing over a short distance, avoiding uneven temperature. Thirdly, in square or trapezoidal cross-sections, local high-speed impacts or airflow deviations are prone to occur at the opposite positions of the inlet and outlet, resulting in uneven airflow diffusion. Circular cross-sections can better disperse and balance the flow direction of return air and makeup air, i.e., cold air after it enters, making it less likely for the airflow to flow at high speed along a certain surface. Instead, the airflow diffuses in the chamber in a near-axially symmetrical manner, thus helping to control the uniformity of wind speed, temperature, and humidity. Fourthly, the columnar structure has relatively uniform stress, which can reduce the risk of chamber deformation or vibration. The inner wall usually has no obvious sharp edges, reducing the probability of dust and dirt accumulation, and making subsequent cleaning and maintenance more convenient.
[0011] In some embodiments, a reserved chamber 8 is provided between the first flow equalization chamber 12 and the first return air chamber 13, and between the second flow equalization chamber 22 and the second return air chamber 23, to prevent the airflow from violently impacting and swirling at the connection point.
[0012] In some embodiments, the return air circulation module 5 is connected to the first air inlet chamber 11, the second air inlet chamber 21, the first return air chamber 13, and the second return air chamber 23 of the upper drying box module 1 and the lower drying box module 2, and is used to generate circulating air between the upper drying box module 1 and the lower drying box module 2 for material drying.
[0013] In some embodiments, the return air circulation module 5 includes a first transfer module 51, a condenser module 52, a heating unit control module 53, an energy storage module 54, and a second transfer module 55 connected sequentially along the return air path. The return air output from the first return air chamber 13 and the second return air chamber 23 of the upper drying chamber module 1 and the lower drying chamber module 2 enters the condenser module 52 via the first transfer module 51 for dehumidification, then is heated by the heating unit control module 53 and enters the energy storage module 54. Finally, it is transported back to the air inlet of the first air inlet chamber 11 and the second air inlet chamber 21 of the upper drying chamber module 1 and / or the lower drying chamber module 2 by the second transfer module 55, forming a return air circulation.
[0014] In some embodiments, the first return air chamber 13, the second return air chamber 23 and the side walls near the corresponding first flow equalization chamber 12 and second flow equalization chamber 22 are provided with multiple air inlets. The air inlets are used to further disperse the airflow so that the airflow can be output from the first return air chamber 13 and the second return air chamber 23 to the return air circulation module 5 and to avoid local high-speed impact caused by a single air inlet.
[0015] In some embodiments, the first return air chamber 13 and the second return air chamber 23 are also provided with exhaust ports to prevent high humidity airflow from continuously accumulating in the rear section of the box and causing condensation or local high humidity leading to oxidation of the material surface.
[0016] Furthermore, the vent is also connected to a self-draining structure.
[0017] In some embodiments, the condenser module 52 is connected to the first make-up air module 6 and is used to moderately cool the return air as needed after dehumidification; wherein the return air temperature is denoted as T2, the inlet air temperature of the drying box module is denoted as T1, and the first make-up air module 6 controls the temperature difference between T2 and T1 to be within the range of 3°C to 5°C by adjusting the amount of cold air supplied.
[0018] In some embodiments, a second air supply module 7 is further provided between the energy storage module 54 and the second transfer module 55 for secondary adjustment of the target air supply temperature T1; when the output temperature of the energy storage module 54 is detected to deviate from the target range, the second air supply module 7 automatically supplies or discharges airflow to maintain a stable drying temperature.
[0019] In some embodiments, the first return air chamber 13 and the second return air chamber 23 are equipped with real-time monitoring devices. The real-time monitoring devices are used to monitor the temperature, humidity and airflow in the first return air chamber 13 and the second return air chamber 23 and automatically adjust the air volume ratio of the first make-up air module 6 and the second make-up air module 7.
[0020] The beneficial effects of this utility model are as follows: This utility model proposes a return air flow channel structure for a drying oven. The upper drying oven module 1 is provided with a first air inlet chamber 11, a first flow equalization chamber 12, and a first return air chamber 13 from top to bottom. The lower drying oven module 2 is provided with a second air inlet chamber 21 from bottom to top. Through the second flow equalization chamber 22 and the second return air chamber 23, the pressure of the first return air chamber 13 and the second return air chamber 23 is lower than the external ambient pressure, so that the external cold air can enter the return air chamber from the inlet or outlet of the feed chamber surface 3 and mix with the high-temperature return air, thereby achieving uniform mixing of the high-temperature return air and the external cold air. The first return air chamber 13 and the second return air chamber 23 are set as return air chambers with cylindrical, polygonal, or trapezoidal cross sections, which solves the problems of turbulent airflow and uneven local temperature in traditional chambers. The first air supply module 6 and the second air supply module 7 are set up, and the two-stage air supply system and the real-time monitoring device work together to greatly improve the accuracy of temperature and humidity control. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the return airflow channel structure of a drying oven according to this application.
[0022] Figure 2 This is a cross-sectional view of the return airflow channel structure of a drying oven in Embodiment 1.
[0023] Figure 3 This is a cross-sectional view of the return airflow channel structure of a drying oven in Embodiment 2.
[0024] Explanation of key component symbols:
[0025] Upper drying box module 1, first air inlet chamber 11, first flow equalization chamber 12, first return air chamber 13, lower drying box module 2, second air inlet chamber 21, second flow equalization chamber 22, second return air chamber 23, feed chamber surface 3, return air circulation module 5, first transfer module 51, condenser box module 52, heating unit control module 53, energy storage module 54, second transfer module 55, first make-up air module 6, second make-up air module 7, reserved chamber 8.
[0026] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation
[0027] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.
[0028] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units, which may include subunits; however, those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together, including integration within a single system or component.
[0029] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections.
[0030] Example 1:
[0031] like Figure 1 The diagram shown is a structural schematic of a return airflow channel structure for a drying oven according to this application; Figure 2 The image shown is a cross-sectional view of a drying oven return airflow channel structure according to this application.
[0032] A return airflow channel structure for a drying oven, characterized in that it comprises:
[0033] The upper drying box module 1 and the lower drying box module 2 form a feeding chamber surface 3 between them for conveying materials;
[0034] The upper drying chamber module 1 is provided with a first air inlet chamber 11, a first flow equalization chamber 12, and a first return air chamber 13 from top to bottom; the lower drying chamber module 2 is provided with a second air inlet chamber 21, a second flow equalization chamber 22, and a second return air chamber 23 from bottom to top. The pressure in the first return air chamber 13 and the second return air chamber 23 is lower than the external ambient pressure, allowing external cold air to enter the return air chamber from the inlet or outlet of the feed chamber surface 3 and mix with the high-temperature return air. The first return air chamber 13 and the second return air chamber 23 are return air chambers with cylindrical, polygonal, or trapezoidal cross-sections, with cylindrical return air chambers being more preferred to increase the internal circumferential area, reduce eddies and temperature unevenness, and ensure uniform mixing of the high-temperature return air and the external cold air.
[0035] Firstly, the cylindrical chamber, with its uniform circumference and absence of sharp corners or dead zones, reduces vortices and backflow areas at the edges compared to square or polygonal chambers. When external cold air mixes with hot return air in this chamber, the airflow becomes relatively stable and smooth, reducing turbulence and thus contributing to a more uniform airflow and temperature distribution at the return air outlet. Secondly, the cylindrical chamber's perimeter is a continuous curved surface, resulting in a larger ratio of inner wall area to internal volume. This promotes the uniformity of heat and humidity exchange and transfer. For the mixing of hot and cold air, the longer contact time and larger circumferential contact area facilitate mixing over short distances. Firstly, uniform mixing avoids uneven temperature distribution. Secondly, in square or trapezoidal cross-sections, localized high-speed impacts or airflow deviations can easily occur at the opposite positions of the inlet and outlet, leading to uneven airflow diffusion. Circular cross-sections can better disperse and balance the flow direction of return air and makeup air (i.e., cold air) after entry, making it less likely for the airflow to adhere to one side at high speed. Instead, the airflow diffuses within the cavity in a near-axially symmetrical manner, thus helping to control the uniformity of wind speed, temperature, and humidity. Thirdly, the columnar structure experiences relatively uniform stress, reducing the risk of cavity deformation or vibration. The inner walls typically have no obvious sharp edges, reducing the probability of dust and dirt accumulation and making subsequent cleaning and maintenance more convenient.
[0036] The return air circulation module 5 is connected to the first air inlet chamber 11, the second air inlet chamber 21, the first return air chamber 13, and the second return air chamber 23 of the upper drying box module 1 and the lower drying box module 2, and is used to form a circulating air between the upper drying box module 1 and the lower drying box module 2 for material drying.
[0037] The return air circulation module 5 includes a first transfer module 51, a condenser module 52, a heating unit control module 53, an energy storage module 54, and a second transfer module 55 connected sequentially along the return air path. The return air output from the first return air chamber 13 and the second return air chamber 23 of the upper drying chamber module 1 and the lower drying chamber module 2 enters the condenser module 52 through the first transfer module 51 for dehumidification, is then heated by the heating unit control module 53 and enters the energy storage module 54, and is finally transported back to the air inlet end of the first air inlet chamber 11 and the second air inlet chamber 21 of the upper drying chamber module 1 and / or the lower drying chamber module 2 by the second transfer module 55, forming a return air circulation.
[0038] The first return air chamber 13, the second return air chamber 23 and the side walls near the corresponding first flow equalization chamber 12 and second flow equalization chamber 22 are provided with multiple air inlets. The air inlets are used to further disperse the airflow so that the airflow can be output from the first return air chamber 13 and the second return air chamber 23 to the return air circulation module 5 and to avoid local high-speed impact caused by a single air inlet.
[0039] The first return air chamber 13 and the second return air chamber 23 are also equipped with exhaust ports to prevent high humidity airflow from accumulating in the rear section of the box and causing condensation or local high humidity leading to oxidation of the material surface.
[0040] The vent is also connected to a self-draining structure.
[0041] The condenser module 52 is connected to the first air supply module 6 and is used to moderately cool the return air as needed after dehumidification. The return air temperature is denoted as T2, and the air inlet temperature of the drying box module is denoted as T1. The first air supply module 6 controls the temperature difference between T2 and T1 within the range of 3°C to 5°C by adjusting the amount of cold air supplied.
[0042] A second air supply module 7 is also provided between the energy storage module 54 and the second transfer module 55 for secondary adjustment of the target air supply temperature T1; when the output temperature of the energy storage module 54 deviates from the target range, the second air supply module 7 automatically replenishes or discharges airflow to maintain a stable drying temperature.
[0043] The first return air chamber 13 and the second return air chamber 23 are equipped with real-time monitoring devices. The real-time monitoring devices are used to monitor the temperature, humidity and airflow in the first return air chamber 13 and the second return air chamber 23 and automatically adjust the air volume ratio of the first air supply module 6 and the second air supply module 7.
[0044] Example 2:
[0045] like Figure 1 The diagram shown is a structural schematic of a return airflow channel structure for a drying oven according to this application; Figure 3 The image shown is a cross-sectional view of a drying oven return airflow channel structure according to this application.
[0046] A return airflow channel structure for a drying oven, characterized in that it comprises:
[0047] The upper drying box module 1 and the lower drying box module 2 form a feeding chamber surface 3 between them for conveying materials;
[0048] The upper drying chamber module 1 is provided with a first air inlet chamber 11, a first flow equalization chamber 12, and a first return air chamber 13 from top to bottom; the lower drying chamber module 2 is provided with a second air inlet chamber 21, a second flow equalization chamber 22, and a second return air chamber 23 from bottom to top. The pressure in the first return air chamber 13 and the second return air chamber 23 is lower than the external ambient pressure, allowing external cold air to enter the return air chamber from the inlet or outlet of the feed chamber surface 3 and mix with the high-temperature return air. The first return air chamber 13 and the second return air chamber 23 are return air chambers with cylindrical, polygonal, or trapezoidal cross-sections.
[0049] A cylindrical return air chamber is preferred, as it increases the internal circumferential area, reduces vortices and temperature unevenness, and allows for a more uniform mixing of hot return air and external cold air. Firstly, the cylindrical chamber's uniform circumference and absence of sharp corners and dead zones, compared to square or polygonal chambers, significantly reduces vortices and backflow zones formed at the corners. When external cold air mixes with hot return air in this chamber, the airflow is relatively stable and smooth, reducing turbulence and contributing to a more uniform airflow and temperature distribution at the return air outlet. Secondly, the cylindrical chamber's continuous curved wall provides a larger ratio of inner wall area to internal volume, facilitating the uniformity of heat and humidity exchange and transfer. For the mixing of hot and cold air, a longer cylindrical chamber... Both the contact time and the large circumferential contact area help achieve uniform mixing over a short distance, avoiding uneven temperature. Thirdly, in square or trapezoidal cross-sections, local high-speed impacts or airflow deviations are prone to occur at the opposite positions of the inlet and outlet, resulting in uneven airflow diffusion. Circular cross-sections can better disperse and balance the flow direction of return air and makeup air, i.e., cold air after it enters, making it less likely for the airflow to flow at high speed along a certain surface. Instead, the airflow diffuses in the chamber in a near-axially symmetrical manner, thus helping to control the uniformity of wind speed, temperature, and humidity. Fourthly, the columnar structure has relatively uniform stress, which can reduce the risk of chamber deformation or vibration. The inner wall usually has no obvious sharp edges, reducing the probability of dust and dirt accumulation, and making subsequent cleaning and maintenance more convenient.
[0050] A reserved chamber 8 is provided between the first flow equalization chamber 12 and the first return air chamber 13, and between the second flow equalization chamber 22 and the second return air chamber 23, to prevent the airflow from violently impacting and swirling at the connection point.
[0051] The return air circulation module 5 is connected to the first air inlet chamber 11, the second air inlet chamber 21, the first return air chamber 13, and the second return air chamber 23 of the upper drying box module 1 and the lower drying box module 2, and is used to form a circulating air between the upper drying box module 1 and the lower drying box module 2 for material drying.
[0052] The return air circulation module 5 includes a first transfer module 51, a condenser module 52, a heating unit control module 53, an energy storage module 54, and a second transfer module 55 connected sequentially along the return air path. The return air output from the first return air chamber 13 and the second return air chamber 23 of the upper drying chamber module 1 and the lower drying chamber module 2 enters the condenser module 52 through the first transfer module 51 for dehumidification, is then heated by the heating unit control module 53 and enters the energy storage module 54, and is finally transported back to the air inlet end of the first air inlet chamber 11 and the second air inlet chamber 21 of the upper drying chamber module 1 and / or the lower drying chamber module 2 by the second transfer module 55, forming a return air circulation.
[0053] The first return air chamber 13, the second return air chamber 23 and the side walls near the corresponding first flow equalization chamber 12 and second flow equalization chamber 22 are provided with multiple air inlets. The air inlets are used to further disperse the airflow so that the airflow can be output from the first return air chamber 13 and the second return air chamber 23 to the return air circulation module 5 and to avoid local high-speed impact caused by a single air inlet.
[0054] The first return air chamber 13 and the second return air chamber 23 are also equipped with exhaust ports to prevent high humidity airflow from accumulating in the rear section of the box and causing condensation or local high humidity leading to oxidation of the material surface.
[0055] The vent is also connected to a self-draining structure.
[0056] The condenser module 52 is connected to the first air supply module 6 and is used to moderately cool the return air as needed after dehumidification. The return air temperature is denoted as T2, and the air inlet temperature of the drying box module is denoted as T1. The first air supply module 6 controls the temperature difference between T2 and T1 within the range of 3°C to 5°C by adjusting the amount of cold air supplied.
[0057] A second air supply module 7 is also provided between the energy storage module 54 and the second transfer module 55 for secondary adjustment of the target air supply temperature T1; when the output temperature of the energy storage module 54 deviates from the target range, the second air supply module 7 automatically replenishes or discharges airflow to maintain a stable drying temperature.
[0058] The first return air chamber 13 and the second return air chamber 23 are equipped with real-time monitoring devices. The real-time monitoring devices are used to monitor the temperature, humidity and airflow in the first return air chamber 13 and the second return air chamber 23 and automatically adjust the air volume ratio of the first air supply module 6 and the second air supply module 7.
[0059] Although this application discloses several aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art. Various modifications and improvements can be made without departing from the concept of this application, and these all fall within the scope of protection of this application. The various aspects and embodiments disclosed in this application are for illustrative purposes only and are not intended to limit this application. The actual scope of protection of this application is determined by the claims.
Claims
1. A return airflow channel structure for a drying oven, characterized in that, include: The upper drying box module (1) and the lower drying box module (2) form a feeding chamber surface (3) between them for conveying materials; The upper drying chamber module (1) is provided with a first air inlet chamber (11), a first flow equalization chamber (12) and a first return air chamber (13) from top to bottom; the lower drying chamber module (2) is provided with a second air inlet chamber (21), a second flow equalization chamber (22) and a second return air chamber (23) from bottom to top. The pressure of the first return air chamber (13) and the second return air chamber (23) is lower than the external ambient pressure, so that the external cold air can enter the return air chamber from the inlet or outlet of the feed chamber surface (3) and mix with the high temperature return air. The first return air chamber (13) and the second return air chamber (23) are return air chambers with cylindrical, polygonal or trapezoidal cross sections.
2. The drying oven return air duct structure as described in claim 1, characterized in that: A reserved chamber (8) is provided between the first flow equalization chamber (12) and the first return air chamber (13), and between the second flow equalization chamber (22) and the second return air chamber (23).
3. The drying oven return air duct structure as described in claim 1, characterized in that: The return air circulation module (5) is connected to the first air inlet chamber (11), the second air inlet chamber (21), the first return air chamber (13), and the second return air chamber (23) of the upper drying box module (1) and the lower drying box module (2), and is used to form a circulating air between the upper drying box module (1) and the lower drying box module (2) for material drying.
4. The drying oven return air duct structure as described in claim 3, characterized in that: The return air circulation module (5) includes a first transfer module (51), a condenser module (52), a heating unit control module (53), an energy storage module (54), and a second transfer module (55) connected sequentially along the return air path. The return air output from the first return air chamber (13) and the second return air chamber (23) of the upper drying box module (1) and the lower drying box module (2) enters the condenser module (52) through the first transfer module (51) for dehumidification, and then is heated by the heating unit control module (53) and enters the energy storage module (54). Finally, it is transported back to the air inlet of the first air inlet chamber (11) and the second air inlet chamber (21) of the upper drying box module (1) and / or the lower drying box module (2) by the second transfer module (55) to form a return air circulation.
5. The drying oven return air duct structure as described in claim 1, characterized in that: Multiple air inlets are provided at intervals on the side walls of the first return air chamber (13), the second return air chamber (23) and the corresponding first flow equalization chamber (12) and second flow equalization chamber (22). The air inlets are used to further disperse the airflow so that the airflow can be output from the first return air chamber (13) and the second return air chamber (23) to the return air circulation module (5) and to avoid local high-speed impact caused by a single air inlet.
6. The drying oven return air duct structure as described in claim 1, characterized in that: The first return air chamber (13) and the second return air chamber (23) are also provided with dehumidification outlets.
7. The drying oven return air duct structure as described in claim 6, characterized in that: The vent is also connected to a self-draining structure.
8. The drying oven return air duct structure as described in claim 4, characterized in that: The condenser module (52) is connected to the first air supply module (6) and is used to moderately cool the return air as needed after dehumidification. The return air temperature is denoted as T2, and the air inlet temperature of the drying box module is denoted as T1. The first air supply module (6) controls the temperature difference between T2 and T1 to be between 3°C and 5°C by adjusting the amount of cold air supplied.
9. The drying oven return air duct structure as described in claim 8, characterized in that: A second air supply module (7) is also provided between the energy storage module (54) and the second transfer module (55) for secondary adjustment of the target air supply temperature T1; when the output temperature of the energy storage module (54) deviates from the target range, the second air supply module (7) automatically supplies or discharges airflow to maintain a stable drying temperature.
10. The drying oven return air duct structure as described in claim 9, characterized in that: The first return air chamber (13) and the second return air chamber (23) are equipped with real-time monitoring devices. The real-time monitoring devices are used to monitor the temperature, humidity and airflow in the first return air chamber (13) and the second return air chamber (23) and automatically adjust the air volume ratio of the first air supply module (6) and the second air supply module (7).