Air return system of copper foil drying box

Abstract

According to the air return system of the copper foil drying box, the pressure intensity lower than the external environment is maintained through the preset position of the drying box module and / or the air return channel, so that external cold air enters an air return cavity through a material inlet or a material outlet for heat exchange; the air return system is further provided with a first temperature control device which is used for controlling the temperature difference between the temperature T2 of return air after condensation and the temperature T1 of the air inlet end of the drying box module within a set range so as to balance the drying efficiency and energy consumption and stabilize the material quality, and through cavities of the drying box module which are symmetrical up and down, double-face uniform heating of materials is achieved, and the local temperature difference is eliminated. Through the first air supplement module and the second air supplement module, the air supply temperature is dynamically adjusted through double air supplement, and the hot air temperature is ensured; the negative pressure environment prevents external dust from invading, the cleanliness of the copper foil is guaranteed, and product defects are reduced; through layered detection of the stepped temperature sensor, the states of different air layers are accurately mastered, and the drying efficiency is optimized.

Description

Technical Field

[0001] This utility model relates to the technical field of copper foil production equipment, and more specifically, to a copper foil drying oven return air system. 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 such 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. Therefore, the copper foil needs to be dried. During the copper foil drying process, extremely high requirements are often placed on drying uniformity, surface cleanliness, and energy consumption control, especially for high-precision applications (such as lithium battery negative electrode current collectors, ultra-thin copper foil for electronic circuits, etc.). The surface quality (flatness, absence of obvious spots or wrinkles), moisture content, and stability of the production process directly affect the reliability and yield of subsequent processes.

[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 above-mentioned drying oven can only achieve air circulation, but it has problems such as high drying energy consumption and insufficient temperature control accuracy. It cannot balance drying efficiency and material quality, resulting in low yield of copper foil products.

[0005] In view of this, the present invention provides a copper foil drying box return air system with high drying efficiency and high drying quality. Utility Model Content

[0006] The purpose of this invention is to provide a copper foil drying box return air system that offers high drying efficiency and high drying quality.

[0007] A copper foil drying oven return air system, characterized in that it comprises:

[0008] The drying box module 1 is provided with a material inlet 11 and a material outlet 12 distributed along the material travel direction, and forms a three-dimensional drying channel 13 inside which includes drying chambers arranged symmetrically at the top and bottom;

[0009] The first transfer module 2 is connected to the return air end of the drying box module 1;

[0010] The condenser module 3 is connected to the first transfer module 2 and is used to condense and dehumidify the return air;

[0011] The heating unit control module 4 is connected to the output terminal of the condenser module 3 and is used to heat the dehumidified return air.

[0012] The energy storage module 5 is connected to the output terminal of the heating unit control module 4 and is used to temporarily store or stably output hot air that meets the set temperature.

[0013] The second transfer module 6 is connected to the energy storage module 5 and communicates with the air inlet of the drying box module 1, and is used to send hot air back to the drying box module 1.

[0014] The return air system maintains a pressure lower than the external environment at a preset position in the drying chamber module 1 and / or the return air channel, so that external cold air enters the return air chamber through the material inlet 11 or the material outlet 12 for heat exchange. The return air system is also equipped with a first temperature control device to control the temperature difference between the temperature T2 of the condensed return air and the temperature T1 of the air inlet of the drying chamber module 1 within a set range, so as to balance drying efficiency and energy consumption and stabilize material quality. The hot air passes through a uniform temperature distribution to ensure that the copper foil surface dries evenly, avoiding local lumps, spots or wrinkles, thereby obtaining a smooth and uniform finished product surface to meet the needs of precision applications.

[0015] In some embodiments, the first temperature control device includes a first air supply module 7 and a second air supply module 8. The first air supply module 7 is located on the output side of the condenser module 3 and is used to cool or heat the return air according to the temperature detection result after the return air is dehumidified, so that the temperature difference between T2 and T1 is maintained at 3℃-5℃. The second air supply module 8 is located between the output end of the heating unit control module 4 and the energy storage module 5, and performs secondary adjustment according to the real-time detected air inlet temperature T1 of the drying box, so as to accurately control the hot air temperature before the return air is sent into the drying box module 1.

[0016] In some embodiments, the drying chamber module 1 includes an upper drying chamber module 14 and a lower drying chamber module 15, which are arranged opposite to each other and form a feeding chamber surface in the middle; the material inlet 11 and the material outlet 12 are respectively arranged at both ends of the feeding chamber surface, so as to realize synchronous drying of the upper and lower surfaces during the material conveying process.

[0017] In some embodiments, both the upper drying box module 14 and the lower drying box module 15 are equipped with multiple temperature sensors arranged in a stepped manner to detect the temperature at the high and low air layers.

[0018] In some embodiments, the upper drying chamber module 14 is provided with a first air inlet chamber 141, a first flow equalization chamber 142 and a first return air chamber 143 from top to bottom; the lower drying chamber module 15 is provided with a second air inlet chamber 151, a second flow equalization chamber 152 and a second return air chamber 153 from bottom to top; wherein the pressure of the first return air chamber 143 and the second return air chamber 153 is lower than the external ambient pressure, so that the external cold air enters the return air chamber by means of negative pressure and mixes with the return air for preliminary cooling, and the negative pressure prevents external dust from entering, thus ensuring the cleanliness of the copper foil.

[0019] In some implementations, the condenser module 3 is a plate heat exchanger structure used for efficient dehumidification within a set temperature range.

[0020] In some embodiments, the energy storage module 5 uses a heat storage material to absorb excess heat and release heat as needed.

[0021] In some embodiments, the energy storage module 5 is equipped with a second temperature monitoring device that works in conjunction with the heating unit control module 4. The device detects the internal temperature of the energy storage module 5 and compares it with temperature T1 to control the air volume, thereby maintaining the stability of the drying oven's heating supply.

[0022] The beneficial effects of this utility model are as follows: This utility model proposes a copper foil drying oven return air system. The system maintains a pressure lower than the external environment through a preset position of the drying oven module 1 and / or the return air channel, allowing external cold air to enter the return air chamber via the material inlet 11 or material outlet 12 for heat exchange. The return air system also includes a first temperature control device to control the temperature difference between the condensed return air temperature T2 and the air inlet temperature T1 of the drying oven module 1 within a set range, balancing drying efficiency and energy consumption and stabilizing material quality. The symmetrical upper and lower drying oven module 1 chambers ensure uniform heating of the material on both sides, eliminating localized temperature differences. The first and second air supply modules 7 and 8 provide dual air supply and dynamic adjustment of the supply air temperature, ensuring the hot air temperature. The negative pressure environment prevents external dust intrusion, ensuring the cleanliness of the copper foil and reducing product defects. A stepped temperature sensor detects different air layers, accurately controlling the state of each layer and optimizing drying efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the return air system of a copper foil drying oven according to this application.

[0024] Figure 2 This is a cross-sectional view of the return air system of a copper foil drying oven according to this application.

[0025] Explanation of key component symbols:

[0026] Drying box module 1, material inlet 11, material outlet 12, three-dimensional drying channel 13, upper drying box module 14, first air inlet chamber 141, first flow equalization chamber 142, first return air chamber 143, lower drying box module 15, second air inlet chamber 151, second flow equalization chamber 152, second return air chamber 153, first transfer module 2, condenser box module 3, heating unit control module 4, energy storage module 5, second transfer module 6, first make-up air module 7, second make-up air module 8.

[0027] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0028] 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.

[0029] In the following description, those skilled in the art will recognize that throughout this discussion, a component may be described as a separate functional unit, which may include sub-units; however, those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together, including integration within a single system or component.

[0030] 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.

[0031] Example 1: As Figure 1 The diagram shown is a structural schematic of a copper foil drying oven return air system according to this application; Figure 2 The image shown is a cross-sectional view of a copper foil drying oven return air system according to this application.

[0032] The copper foil being dried has the following specifications: thickness 6μm, width 1580mm. The production line conveyor speed is 10m / min. The drying oven is set at 75℃, and the external environment is at 25℃ and 60% relative humidity.

[0033] A copper foil drying oven return air system, characterized in that it comprises:

[0034] The drying box module 1 is provided with a material inlet 11 and a material outlet 12 distributed along the material travel direction, and forms a three-dimensional drying channel 13 inside which includes drying chambers arranged symmetrically at the top and bottom;

[0035] The first transfer module 2 is connected to the return air end of the drying box module 1;

[0036] The condenser module 3 is connected to the first transfer module 2 and is used to condense and dehumidify the return air;

[0037] The heating unit control module 4 is connected to the output terminal of the condenser module 3 and is used to heat the dehumidified return air, with a rated power of about 3kW.

[0038] The energy storage module 5 is connected to the output terminal of the heating unit control module 4 and is used to temporarily store or stably output hot air that meets the set temperature. The heat storage capacity is 15kJ / kg.

[0039] The second transfer module 6 is connected to the energy storage module 5 and communicates with the air inlet of the drying box module 1, and is used to send hot air back to the drying box module 1.

[0040] The return air system maintains a pressure lower than the external environment at a preset position in the drying chamber module 1 and / or the return air channel. The return air end maintains a negative pressure of approximately 200-300 Pa, allowing external cold air to enter the return air chamber through the inlet or outlet and mix. This allows the external cold air to enter the return air chamber through the material inlet 11 or material outlet 12 for heat exchange. The return air system is also equipped with a first temperature control device to control the temperature difference between the condensed return air temperature T2 and the air inlet temperature T1 of the drying chamber module 1 within a set range. This balances drying efficiency and energy consumption and stabilizes material quality. The hot air, through a uniform temperature distribution, ensures consistent drying of the copper foil surface, avoiding localized clumping, spots, or wrinkles, thereby obtaining a smooth and uniform finished product surface that meets the requirements of precision applications.

[0041] The first temperature control device includes a first air supply module 7 and a second air supply module 8. The first air supply module 7 is located on the output side of the condenser module 3 and is used to cool or heat the return air according to the temperature detection result after the return air is dehumidified, so that the temperature difference between T2 and T1 is maintained at no more than 5℃. The second air supply module 8 is located between the output end of the heating unit control module 4 and the energy storage module 5, and performs secondary adjustment according to the real-time detected air inlet temperature T1 of the drying box, so as to ensure that the temperature of the hot air sent into the drying box is stable at 75℃.

[0042] The drying chamber module 1 includes an upper drying chamber module 14 and a lower drying chamber module 15, which are arranged opposite to each other and form a feeding chamber surface in the middle. The material inlet 11 and the material outlet 12 are respectively arranged at both ends of the feeding chamber surface to achieve synchronous drying of the upper and lower surfaces during the material conveying process.

[0043] Both the upper drying box module 14 and the lower drying box module 15 are equipped with multiple temperature sensors arranged in a stepped manner to detect the temperature at the high and low air layers.

[0044] The upper drying chamber module 14 is provided with a first air inlet chamber 141, a first flow equalization chamber 142 and a first return air chamber 143 from top to bottom; the lower drying chamber module 15 is provided with a second air inlet chamber 151, a second flow equalization chamber 152 and a second return air chamber 153 from bottom to top; wherein, the pressure of the first return air chamber 143 and the second return air chamber 153 is lower than the external ambient pressure, so that the external cold air enters the return air chamber by means of negative pressure and mixes with the return air for preliminary cooling, and the negative pressure prevents external dust from entering, thus ensuring the cleanliness of the copper foil.

[0045] The condenser module 3 is a plate heat exchanger structure used for efficient dehumidification within a set temperature range.

[0046] The energy storage module 5 uses heat storage materials to absorb excess heat and release heat as needed.

[0047] The energy storage module 5 is equipped with a second temperature monitoring device that works in conjunction with the heating unit control module 4. By detecting the internal temperature of the energy storage module 5 and comparing it with temperature T1, the incoming and outgoing air volume is controlled to maintain the stability of the drying oven's heating supply.

[0048] Implementation process:

[0049] After the system is turned on, the heating unit and the energy storage module reach the preset temperature, and a 6μm copper foil (1580mm wide) is conveyed into the drying channel at a speed of 10m / min.

[0050] External cold air (temperature 25℃, RH 60%) enters the return air chamber through material inlet 11 or outlet 12 under negative pressure, mixes with the return air, and is initially cooled. It is then further dehumidified through condenser module 3.

[0051] The first air supply module 7 provides a small amount of air supply or adjusts the air volume based on the measured temperature of the return air; then the return air is heated to around 75°C by the heating unit 4, and finally sent to the upper / lower drying oven module after the second air supply module 8 makes a final temperature adjustment.

[0052] After running continuously for 2 hours, energy consumption and various quality indicators were collected.

[0053] The measurements and results are shown in Table 1:

[0054]

[0055] As shown in Table 1, the use of the return air system in Example 1 improves the drying uniformity and significantly reduces the moisture content difference; the cleanliness inside the chamber is significantly improved, and the negative pressure dust prevention effect is significant; energy consumption is reduced by about 71%, reflecting the energy-saving effect of two-stage air supply and heat recovery; the surface spot and wrinkle defect rate is reduced from 3% to 0.6%, and the product quality is significantly improved.

[0056] Example 2:

[0057] like Figure 1 The diagram shown is a structural schematic of a copper foil drying oven return air system according to this application; Figure 2 The image shown is a cross-sectional view of a copper foil drying oven return air system according to this application.

[0058] The specifications for the dried copper foil are: thickness 3μm, width 1580mm, production line conveyor speed 10m / min, drying oven set temperature 75℃, external environment: temperature 25℃, relative humidity 60%.

[0059] A copper foil drying oven return air system, characterized in that it comprises:

[0060] The drying box module 1 is provided with a material inlet 11 and a material outlet 12 distributed along the material travel direction, and forms a three-dimensional drying channel 13 inside which includes drying chambers arranged symmetrically at the top and bottom;

[0061] The first transfer module 2 is connected to the return air end of the drying box module 1;

[0062] The condenser module 3 is connected to the first transfer module 2 and is used to condense and dehumidify the return air;

[0063] The heating unit control module 4 is connected to the output terminal of the condenser module 3 and is used to heat the dehumidified return air, with a rated power of about 3kW.

[0064] The energy storage module 5 is connected to the output terminal of the heating unit control module 4 and is used to temporarily store or stably output hot air that meets the set temperature. The heat storage capacity is 15kJ / kg.

[0065] The second transfer module 6 is connected to the energy storage module 5 and communicates with the air inlet of the drying box module 1, and is used to send hot air back to the drying box module 1.

[0066] The return air system maintains a pressure lower than the external environment at a preset position in the drying chamber module 1 and / or the return air channel. The return air end maintains a negative pressure of approximately 200-300 Pa, allowing external cold air to enter the return air chamber through the inlet or outlet and mix. This allows the external cold air to enter the return air chamber through the material inlet 11 or material outlet 12 for heat exchange. The return air system is also equipped with a first temperature control device to control the temperature difference between the condensed return air temperature T2 and the air inlet temperature T1 of the drying chamber module 1 within a set range. This balances drying efficiency and energy consumption and stabilizes material quality. The hot air, through a uniform temperature distribution, ensures consistent drying of the copper foil surface, avoiding localized clumping, spots, or wrinkles, thereby obtaining a smooth and uniform finished product surface that meets the requirements of precision applications.

[0067] The first temperature control device includes a first air supply module 7 and a second air supply module 8. The first air supply module 7 is located on the output side of the condenser module 3 and is used to cool or heat the return air according to the temperature detection result after the return air is dehumidified, so that the temperature difference between T2 and T1 is maintained at no more than 5℃. The second air supply module 8 is located between the output end of the heating unit control module 4 and the energy storage module 5, and performs secondary adjustment according to the real-time detected air inlet temperature T1 of the drying box, so as to ensure that the temperature of the hot air sent into the drying box is stable at 75℃.

[0068] The drying chamber module 1 includes an upper drying chamber module 14 and a lower drying chamber module 15, which are arranged opposite to each other and form a feeding chamber surface in the middle. The material inlet 11 and the material outlet 12 are respectively arranged at both ends of the feeding chamber surface to achieve synchronous drying of the upper and lower surfaces during the material conveying process.

[0069] Both the upper drying box module 14 and the lower drying box module 15 are equipped with multiple temperature sensors arranged in a stepped manner to detect the temperature at the high and low air layers.

[0070] The upper drying chamber module 14 is provided with a first air inlet chamber 141, a first flow equalization chamber 142 and a first return air chamber 143 from top to bottom; the lower drying chamber module 15 is provided with a second air inlet chamber 151, a second flow equalization chamber 152 and a second return air chamber 153 from bottom to top; wherein, the pressure of the first return air chamber 143 and the second return air chamber 153 is lower than the external ambient pressure, so that the external cold air enters the return air chamber by means of negative pressure and mixes with the return air for preliminary cooling, and the negative pressure prevents external dust from entering, thus ensuring the cleanliness of the copper foil.

[0071] The condenser module 3 is a plate heat exchanger structure used for efficient dehumidification within a set temperature range.

[0072] The energy storage module 5 uses heat storage materials to absorb excess heat and release heat as needed.

[0073] The energy storage module 5 is equipped with a second temperature monitoring device that works in conjunction with the heating unit control module 4. By detecting the internal temperature of the energy storage module 5 and comparing it with temperature T1, the incoming and outgoing air volume is controlled to maintain the stability of the drying oven's heating supply.

[0074] Implementation process:

[0075] After the system is turned on, the heating unit and the energy storage module reach the preset temperature, and the 3μm copper foil (1580mm wide) is transported into the drying channel at a speed of 10m / min.

[0076] External cold air (temperature 25℃, RH 60%) enters the return air chamber through material inlet 11 or outlet 12 under negative pressure, mixes with the return air, and is initially cooled. It is then further dehumidified through condenser module 3.

[0077] The first air supply module 7 provides a small amount of air supply or adjusts the air volume based on the measured temperature of the return air; then the return air is heated to around 75°C by the heating unit 4, and finally sent to the upper / lower drying oven module after the second air supply module 8 makes a final temperature adjustment.

[0078] After running continuously for 2 hours, energy consumption and various quality indicators were collected.

[0079] The measurements and results are shown in Table 2:

[0080]

[0081] As shown in Table 2, the return air system in Example 2 can dry thin (3μm) copper foil quickly, but the surface is prone to over-drying or scalding. Through precise adjustment of two-stage air supply and energy storage buffer, the drying temperature is stabilized within ±1.3℃, avoiding temperature shock. The energy consumption is reduced by about 64% compared with the control system, and the defect rate is reduced from 2.5% to 0.5%.

[0082] Example 3:

[0083] like Figure 1 The diagram shown is a structural schematic of a copper foil drying oven return air system according to this application; Figure 2 The image shown is a cross-sectional view of a copper foil drying oven return air system according to this application.

[0084] The copper foil being dried has the following specifications: thickness 12μm, width 1580mm. The production line conveyor speed is 10m / min. The drying oven is set at 75℃, and the external environment is at 25℃ and 60% relative humidity.

[0085] A copper foil drying oven return air system, characterized in that it comprises:

[0086] The drying box module 1 is provided with a material inlet 11 and a material outlet 12 distributed along the material travel direction, and forms a three-dimensional drying channel 13 inside which includes drying chambers arranged symmetrically at the top and bottom;

[0087] The first transfer module 2 is connected to the return air end of the drying box module 1;

[0088] The condenser module 3 is connected to the first transfer module 2 and is used to condense and dehumidify the return air;

[0089] The heating unit control module 4 is connected to the output terminal of the condenser module 3 and is used to heat the dehumidified return air, with a rated power of about 3kW.

[0090] The energy storage module 5 is connected to the output terminal of the heating unit control module 4 and is used to temporarily store or stably output hot air that meets the set temperature. The heat storage capacity is 15kJ / kg.

[0091] The second transfer module 6 is connected to the energy storage module 5 and communicates with the air inlet of the drying box module 1, and is used to send hot air back to the drying box module 1.

[0092] The return air system maintains a pressure lower than the external environment at a preset position in the drying chamber module 1 and / or the return air channel. The return air end maintains a negative pressure of approximately 200-300 Pa, allowing external cold air to enter the return air chamber through the inlet or outlet and mix. This allows the external cold air to enter the return air chamber through the material inlet 11 or material outlet 12 for heat exchange. The return air system is also equipped with a first temperature control device to control the temperature difference between the condensed return air temperature T2 and the air inlet temperature T1 of the drying chamber module 1 within a set range. This balances drying efficiency and energy consumption and stabilizes material quality. The hot air, through a uniform temperature distribution, ensures consistent drying of the copper foil surface, avoiding localized clumping, spots, or wrinkles, thereby obtaining a smooth and uniform finished product surface that meets the requirements of precision applications.

[0093] The first temperature control device includes a first air supply module 7 and a second air supply module 8. The first air supply module 7 is located on the output side of the condenser module 3 and is used to cool or heat the return air according to the temperature detection result after the return air is dehumidified, so that the temperature difference between T2 and T1 is maintained at no more than 5℃. The second air supply module 8 is located between the output end of the heating unit control module 4 and the energy storage module 5, and performs secondary adjustment according to the real-time detected air inlet temperature T1 of the drying box, so as to ensure that the temperature of the hot air sent into the drying box is stable at 75℃.

[0094] The drying chamber module 1 includes an upper drying chamber module 14 and a lower drying chamber module 15, which are arranged opposite to each other and form a feeding chamber surface in the middle. The material inlet 11 and the material outlet 12 are respectively arranged at both ends of the feeding chamber surface to achieve synchronous drying of the upper and lower surfaces during the material conveying process.

[0095] Both the upper drying box module 14 and the lower drying box module 15 are equipped with multiple temperature sensors arranged in a stepped manner to detect the temperature at the high and low air layers.

[0096] The upper drying chamber module 14 is provided with a first air inlet chamber 141, a first flow equalization chamber 142 and a first return air chamber 143 from top to bottom; the lower drying chamber module 15 is provided with a second air inlet chamber 151, a second flow equalization chamber 152 and a second return air chamber 153 from bottom to top; wherein, the pressure of the first return air chamber 143 and the second return air chamber 153 is lower than the external ambient pressure, so that the external cold air enters the return air chamber by means of negative pressure and mixes with the return air for preliminary cooling, and the negative pressure prevents external dust from entering, thus ensuring the cleanliness of the copper foil.

[0097] The condenser module 3 is a plate heat exchanger structure used for efficient dehumidification within a set temperature range.

[0098] The energy storage module 5 uses heat storage materials to absorb excess heat and release heat as needed.

[0099] The energy storage module 5 is equipped with a second temperature monitoring device that works in conjunction with the heating unit control module 4. By detecting the internal temperature of the energy storage module 5 and comparing it with temperature T1, the incoming and outgoing air volume is controlled to maintain the stability of the drying oven's heating supply.

[0100] Implementation process:

[0101] Once the system is turned on, the heating unit and the energy storage module reach the preset temperature, and a 12μm copper foil (1580mm wide) is conveyed into the drying channel at a speed of 10m / min. The thicker (12μm) copper foil has a higher thermal conductivity and usually requires a slightly longer drying time, but stable production can still be achieved at the same line speed.

[0102] External cold air (temperature 25℃, RH 60%) enters the return air chamber through material inlet 11 or outlet 12 under negative pressure, mixes with the return air, and is initially cooled. It is then further dehumidified through condenser module 3.

[0103] The first air supply module 7 provides a small amount of air supply or adjusts the air volume based on the measured temperature of the return air; then the return air is heated to around 75°C by the heating unit 4, and finally sent to the upper / lower drying oven module after the second air supply module 8 makes a final temperature adjustment.

[0104] After running continuously for 2 hours, energy consumption and various quality indicators were collected.

[0105] The measurements and results are shown in Table 3:

[0106]

[0107]

[0108] As shown in Table 3, using the return air system in Example 3, even for thicker (12μm) copper foil, uniform drying can still be achieved under the same set temperature and line speed. Through the synergistic effect of the energy storage module and dual air supply, the temperature fluctuation is only ±1.4℃, the energy consumption is reduced by about 14% compared with the control, and the defect rate is significantly reduced.

[0109] In summary, under the same production line speed, set temperature, ambient humidity, and system parameters, Examples 1-3, by changing only the copper foil thickness (3μm, 6μm, 12μm), all demonstrate the applicability and significant technical effect of the "copper foil drying oven return air system" described in this invention for materials of different thicknesses. Regardless of whether the thickness is thin (3μm) or thick (12μm), this system maintains small temperature fluctuations (±1.2-±1.4℃) and high drying uniformity (moisture content difference <±0.1%); the defect rate is generally reduced to below 1%, a significant improvement compared to the 2-3% or higher surface defects of traditional systems; energy consumption is also generally about 60%-70% lower than the control scheme, indicating that the combination of "negative pressure return air + condensation dehumidification + two-stage air supply + energy storage module" has significant advantages in energy saving and quality control.

[0110] Example 4: Figure 1 The diagram shown is a structural schematic of a copper foil drying oven return air system according to this application; Figure 2 The image shown is a cross-sectional view of a copper foil drying oven return air system according to this application.

[0111] The copper foil being dried has the following specifications: thickness 6μm, width 1580mm. The production line conveyor speed is 10m / min. The drying oven temperature is set at 75℃, and the external environment is set at 25℃ and 70% relative humidity (simulating a high humidity environment).

[0112] A copper foil drying oven return air system, characterized in that it comprises:

[0113] The drying box module 1 is provided with a material inlet 11 and a material outlet 12 distributed along the material travel direction, and forms a three-dimensional drying channel 13 inside which includes drying chambers arranged symmetrically at the top and bottom;

[0114] The first transfer module 2 is connected to the return air end of the drying box module 1;

[0115] The condenser module 3 is connected to the first transfer module 2 and is used to condense and dehumidify the return air;

[0116] The heating unit control module 4 is connected to the output terminal of the condenser module 3 and is used to heat the dehumidified return air, with a rated power of about 3kW.

[0117] The energy storage module 5 is connected to the output terminal of the heating unit control module 4 and is used to temporarily store or stably output hot air that meets the set temperature. The heat storage capacity is 15kJ / kg.

[0118] The second transfer module 6 is connected to the energy storage module 5 and communicates with the air inlet of the drying box module 1, and is used to send hot air back to the drying box module 1.

[0119] The return air system maintains a pressure lower than the external environment at a preset position in the drying chamber module 1 and / or the return air channel. The return air end maintains a negative pressure of approximately 250-300 Pa, allowing external cold air to enter the return air chamber through the inlet or outlet and mix. This allows the external cold air to enter the return air chamber through the material inlet 11 or material outlet 12 for heat exchange. The return air system is also equipped with a first temperature control device to control the temperature difference between the condensed return air temperature T2 and the air inlet temperature T1 of the drying chamber module 1 within a set range, so as to balance drying efficiency and energy consumption and stabilize material quality. The hot air, through a uniform temperature distribution, ensures that the copper foil surface dries evenly, avoiding local lumps, spots, or wrinkles, thereby obtaining a smooth and uniform finished product surface to meet the needs of precision applications.

[0120] The first temperature control device includes a first air supply module 7 and a second air supply module 8. The first air supply module 7 is located on the output side of the condenser module 3 and is used to cool or heat the return air according to the temperature detection result after the return air is dehumidified, so that the temperature difference between T2 and T1 is maintained at 3℃-5℃. The second air supply module 8 is located between the output end of the heating unit control module 4 and the energy storage module 5, and performs secondary adjustment according to the real-time detected air inlet temperature T1 of the drying box, so as to ensure that the temperature of the hot air sent into the drying box is stable at 75℃.

[0121] The drying chamber module 1 includes an upper drying chamber module 14 and a lower drying chamber module 15, which are arranged opposite to each other and form a feeding chamber surface in the middle. The material inlet 11 and the material outlet 12 are respectively arranged at both ends of the feeding chamber surface to achieve synchronous drying of the upper and lower surfaces during the material conveying process.

[0122] Both the upper drying box module 14 and the lower drying box module 15 are equipped with multiple temperature sensors arranged in a stepped manner to detect the temperature at the high and low air layers.

[0123] The upper drying chamber module 14 is provided with a first air inlet chamber 141, a first flow equalization chamber 142 and a first return air chamber 143 from top to bottom; the lower drying chamber module 15 is provided with a second air inlet chamber 151, a second flow equalization chamber 152 and a second return air chamber 153 from bottom to top; wherein, the pressure of the first return air chamber 143 and the second return air chamber 153 is lower than the external ambient pressure, so that the external cold air enters the return air chamber by means of negative pressure and mixes with the return air for preliminary cooling, and the negative pressure prevents external dust from entering, thus ensuring the cleanliness of the copper foil.

[0124] The condenser module 3 is a plate heat exchanger structure used for efficient dehumidification within a set temperature range.

[0125] The energy storage module 5 uses heat storage materials to absorb excess heat and release heat as needed.

[0126] The energy storage module 5 is equipped with a second temperature monitoring device that works in conjunction with the heating unit control module 4. By detecting the internal temperature of the energy storage module 5 and comparing it with temperature T1, the incoming and outgoing air volume is controlled to maintain the stability of the drying oven's heating supply.

[0127] Implementation process:

[0128] The operation process is the same as in Example 1: external cold air is introduced under negative pressure for initial cooling. After dehumidification in the condenser box, it is finely adjusted by the first air supply module 7, then heated to about 75°C and adjusted again at the second air supply module 8, and finally sent into the drying box module.

[0129] After running continuously for 2 hours, energy consumption and various quality indicators were collected.

[0130] The measurements and results are shown in Table 4:

[0131]

[0132]

[0133] As shown in Table 4, when using the return air system in Example 2, due to the increased external humidity, there is more moisture in the return air. The plate heat exchanger and negative pressure synergy of this system can still quickly control the RH in the box to about 20%, while the control system rises to more than 30%. The dehumidification efficiency is significantly improved, the energy consumption is still about 71% lower than the control, the drying quality is maintained well, and the defect rate is only 0.8%.

[0134] Example 5: Figure 1 The diagram shown is a structural schematic of a copper foil drying oven return air system according to this application; Figure 2 The image shown is a cross-sectional view of a copper foil drying oven return air system according to this application.

[0135] The copper foil being dried has the following specifications: thickness 6μm, width 1580mm. The production line conveyor speed is 10m / min. The drying oven is set at 75℃, and the external environment is set at 25℃ and 80% relative humidity (simulating an extreme humidity environment).

[0136] A copper foil drying oven return air system, characterized in that it comprises:

[0137] The drying box module 1 is provided with a material inlet 11 and a material outlet 12 distributed along the material travel direction, and forms a three-dimensional drying channel 13 inside which includes drying chambers arranged symmetrically at the top and bottom;

[0138] The first transfer module 2 is connected to the return air end of the drying box module 1;

[0139] The condenser module 3 is connected to the first transfer module 2 and is used to condense and dehumidify the return air;

[0140] The heating unit control module 4 is connected to the output terminal of the condenser module 3 and is used to heat the dehumidified return air, with a rated power of about 3kW.

[0141] The energy storage module 5 is connected to the output terminal of the heating unit control module 4 and is used to temporarily store or stably output hot air that meets the set temperature. The heat storage capacity is 15kJ / kg.

[0142] The second transfer module 6 is connected to the energy storage module 5 and communicates with the air inlet of the drying box module 1, and is used to send hot air back to the drying box module 1.

[0143] The return air system maintains a pressure lower than the external environment at a preset position in the drying chamber module 1 and / or the return air channel, with a negative pressure of approximately 300 Pa at the return air end. This allows external cold air to enter the return air chamber through the inlet or outlet and mix, so that the external cold air enters the return air chamber through the material inlet 11 or the material outlet 12 for heat exchange. The return air system is also equipped with a first temperature control device to control the temperature difference between the condensed return air temperature T2 and the air inlet temperature T1 of the drying chamber module 1 within a set range, so as to balance drying efficiency and energy consumption and stabilize material quality. The hot air passes through a uniform temperature distribution to ensure that the copper foil surface dries evenly, avoiding local lumps, spots or wrinkles, thereby obtaining a smooth and uniform finished product surface to meet the needs of precision applications.

[0144] The first temperature control device includes a first air supply module 7 and a second air supply module 8. The first air supply module 7 is located on the output side of the condenser module 3 and is used to cool or heat the return air according to the temperature detection result after the return air is dehumidified, so that the temperature difference between T2 and T1 is maintained at 3℃-5℃. The second air supply module 8 is located between the output end of the heating unit control module 4 and the energy storage module 5, and performs secondary adjustment according to the real-time detected air inlet temperature T1 of the drying box, so as to ensure that the temperature of the hot air sent into the drying box is stable at 75℃.

[0145] The drying chamber module 1 includes an upper drying chamber module 14 and a lower drying chamber module 15, which are arranged opposite to each other and form a feeding chamber surface in the middle. The material inlet 11 and the material outlet 12 are respectively arranged at both ends of the feeding chamber surface to achieve synchronous drying of the upper and lower surfaces during the material conveying process.

[0146] Both the upper drying box module 14 and the lower drying box module 15 are equipped with multiple temperature sensors arranged in a stepped manner to detect the temperature at the high and low air layers.

[0147] The upper drying chamber module 14 is provided with a first air inlet chamber 141, a first flow equalization chamber 142 and a first return air chamber 143 from top to bottom; the lower drying chamber module 15 is provided with a second air inlet chamber 151, a second flow equalization chamber 152 and a second return air chamber 153 from bottom to top; wherein, the pressure of the first return air chamber 143 and the second return air chamber 153 is lower than the external ambient pressure, so that the external cold air enters the return air chamber by means of negative pressure and mixes with the return air for preliminary cooling, and the negative pressure prevents external dust from entering, thus ensuring the cleanliness of the copper foil.

[0148] The condenser module 3 is a plate heat exchanger structure used for efficient dehumidification within a set temperature range.

[0149] The energy storage module 5 uses heat storage materials to absorb excess heat and release heat as needed.

[0150] The energy storage module 5 is equipped with a second temperature monitoring device that works in conjunction with the heating unit control module 4. By detecting the internal temperature of the energy storage module 5 and comparing it with temperature T1, the incoming and outgoing air volume is controlled to maintain the stability of the drying oven's heating supply.

[0151] Implementation process:

[0152] The operating procedure is the same as in Examples 1 and 5: after negative pressure intake, dehumidification in the condenser box, and two-stage air supply heating, the output temperature is stably 75°C.

[0153] Due to the high external humidity, the linkage between the condenser and the energy storage module becomes even more important: when the humidity in the return air fluctuates, the first air supply module 7 adjusts the air volume in time to ensure that T2 does not deviate significantly from T1; the heating unit and the energy storage module 5 work together to avoid large temperature difference shocks and maintain stable hot air.

[0154] After running continuously for 2 hours, energy consumption and various quality indicators were collected.

[0155] The measurements and results are shown in Table 5:

[0156]

[0157]

[0158] As shown in Table 5, when the humidity is very high, the return air system in this embodiment 5 can still control the humidity inside the chamber to about 22%, which is significantly lower than the control. Temperature fluctuations are effectively suppressed (±1.3℃), indicating that the dynamic regulation of two-stage air supply + energy storage can smoothly cope with changes in dehumidification load. Compared with the control system, energy consumption is still reduced by more than 70%, and the surface defect rate is also reduced by nearly 2.5 percentage points.

[0159] In summary, Examples 1, 4, and 5 maintained the same copper foil thickness (6μm), production line speed (10m / min), and set temperature (75℃), and were tested only under conditions where the external ambient humidity gradually increased from 60%, 70%, and 80%. All examples showed that the combination of "negative pressure return air + plate heat exchanger dehumidification + two-stage air supply control + energy storage module" described in this invention has significant advantages in terms of drying uniformity, energy saving, and cleanliness. When the humidity is higher, the energy consumption and defect rate of traditional systems are usually more severe. However, this application effectively reduces the water vapor content in the chamber by relying on negative pressure and condensation dehumidification, and maintains temperature stability through the energy storage module, greatly reducing overheating or drastic temperature fluctuations.

[0160] 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 air system for a copper foil drying oven, comprising: The application relates to a drying system for drying materials, which comprises the following modules: a drying box module (1) provided with a material inlet (11) and a material outlet (12) arranged along the material running direction, and internally forming a three-dimensional drying channel (13) containing upper and lower symmetrically arranged drying cavities; a first transfer module (2) connected with the return air end of the drying box module (1); a condensing box module (3) connected with the first transfer module (2) and used for condensing and dehumidifying return air; a heating unit control module (4) connected with the output end of the condensing box module (3) and used for heating the dehumidified return air; an energy storage module (5) connected with the output end of the heating unit control module (4) and used for temporarily storing or stabilizing the output of hot air meeting the set temperature; a second transfer module (6) connected with the energy storage module (5) and connected with the air inlet end of the drying box module (1) and used for sending hot air back to the drying box module (1); wherein the return air system maintains a pressure lower than that of the external environment at a preset position of the drying box module (1) and / or the return air channel, so that external cold air enters the return air chamber through the material inlet (11) or the material outlet (12) to exchange heat; the return air system is also provided with a first temperature control device for controlling the temperature difference between the temperature T2 of the condensed return air and the temperature T1 of the air inlet end of the drying box module (1) within a set range, so as to balance the drying efficiency and energy consumption and stabilize the material quality. The first temperature control device comprises a first air supplementing module (7) and a second air supplementing module (8), the first air supplementing module (7) is arranged on the output side of the condensing box module (3) and is used for adjusting the temperature of the return air after dehumidification according to the temperature detection result, so that the temperature difference between T2 and T1 is maintained at 3-5 DEG C, the second air supplementing module (8) is arranged between the output end of the heating unit control module (4) and the energy storage module (5) and is used for secondary adjustment according to the real-time detected air inlet temperature T1 of the drying box, so as to accurately control the temperature of the hot air before the return air is sent into the drying box module (1). The drying box module (1) comprises an upper drying box module (14) and a lower drying box module (15), the two modules are oppositely arranged and form a feeding chamber face in the middle part; the material inlet (11) and the material outlet (12) are arranged at two ends of the feeding chamber face respectively, so as to realize synchronous drying of the upper and lower surfaces during the material conveying process. The upper drying box module (14) and the lower drying box module (15) are also provided with a plurality of temperature sensors arranged in steps inside, which detect the temperature of high and low air layers. ​ ​ ​ ​ 2. The copper foil drying oven return air system of claim 1, wherein: ​ 3. The copper foil drying oven return air system of claim 1, wherein: ​ 4. The copper foil drying oven return air system of claim 3, wherein: ​ 5. The copper foil drying oven return air system of claim 3, wherein: The upper drying box module (14) is sequentially provided with a first air inlet chamber (141), a first flow equalization chamber (142) and a first return air chamber (143) from top to bottom; the lower drying box module (15) is sequentially provided with a second air inlet chamber (151), a second flow equalization chamber (152) and a second return air chamber (153) from bottom to top; wherein the pressure of the first return air chamber (143) and the second return air chamber (153) is lower than the external environment pressure, so that the external cold air enters the return air chamber by means of negative pressure and is preliminarily cooled by mixing with the return air, and the negative pressure prevents the external dust from invading, thereby ensuring the cleanliness of the copper foil.

6. The copper foil drying oven return air system of claim 1, wherein: The condensing box module (3) is a plate heat exchanger structure, which is used for efficient dehumidification within a set temperature range.

7. The copper foil drying oven return air system of claim 1, wherein: The energy storage module (5) uses heat storage materials to absorb excess heat and release heat according to the demand.

8. The copper foil drying oven return air system of claim 1, wherein: The second temperature monitoring device cooperating with the heating unit control module (4) is arranged in the energy storage module (5), which controls the air inlet and outlet volume by detecting the internal temperature of the energy storage module (5) and comparing with the temperature T1, thereby maintaining the stability of the heating of the drying box.

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