A laminated foil heat treatment furnace

Abstract

The application relates to a laminated foil heat treatment furnace, belonging to the technical field of heat treatment equipment manufacturing, which comprises a main furnace body, a circulating heat assembly, a gas control assembly and a side cooling assembly, the gas control assembly comprises an integrated gas control valve frame, the integrated gas control valve frame comprises a first gas inlet pipeline and a second gas inlet pipeline, an argon gas source and a protective gas source are respectively connected to the integrated gas control valve frame, flow control valves and pressure reducing valves are arranged in series on the pipelines of the integrated gas control valve frame, the flow control valves and the pressure reducing valves are used for adjusting the gas flow and pressure blown into a heat treatment chamber, and the gas supplemented through the second gas inlet pipeline is blown into the heat treatment chamber after being mixed with the furnace gas at a circulating fan. The application has the effects of improving the problems that the existing large box type heat treatment furnace is prone to uneven heating of materials due to the fact that the supplemented gas is directly blown into the heat treatment chamber, and the cooling heat exchanger is arranged in the heat treatment chamber, so that the leaked cooling medium is prone to directly entering a material area.

Description

Technical Field

[0001] This application relates to the technical field of heat treatment equipment manufacturing, and in particular to a laminated foil heat treatment furnace. Background Technology

[0002] Currently, the manufacturing process of composite aluminum foil (laminated foil) in fields such as energy storage batteries and data centers typically requires two core continuous heat treatment processes: First, a degreasing process is carried out in an aerobic environment at approximately 300°C to cause oxidation of the organic materials in the composite electrode; then, a semi-molten sintering process is performed at approximately 600°C or higher. This stage must be carried out in a micro-oxygen or oxygen-free environment created by replacing air with inert gas to ensure adhesion and solidification of the coating material to the semi-molten aluminum foil. To increase the loading capacity of a single heat treatment and reduce production costs, the industry is gradually trying to use large box furnaces to replace traditional vacuum furnaces or bell furnaces. In the operation of existing large box furnaces, pressurization or atmosphere replacement is usually achieved by directly filling the furnace with cold inert gas, and forced water cooling heat exchange is performed on the high-temperature furnace chamber during the cooling stage using a built-in heat exchanger.

[0003] Large box furnaces often have numerous gaps at the joints of static and dynamic components, such as the fan shaft and temperature measuring holes, resulting in insufficient overall airtightness. This makes it difficult to maintain the micro-oxygen or oxygen-free environment required for the process during prolonged high-temperature sintering, which can easily lead to oxidation of the laminated foil materials. If the cold gas added during the process is directly blown into the furnace, it can easily cause large local temperature differences and turbulent airflow distribution, resulting in uneven heating of materials under large-capacity loading. The welds or joints of the pipes in existing forced cooling heat exchangers are usually located inside the furnace body. Under the drastic temperature change from 600°C to room temperature, the welds of the heat exchange pipes are prone to micro-cracks due to thermal stress fatigue, causing moisture to leak directly into the sealed high-temperature furnace, resulting in material dampness and scrapping, as well as potential safety hazards.

[0004] Regarding the aforementioned technologies, the inventors believe that existing large box-type heat treatment furnaces have the problems of uneven heating of materials due to the direct blowing of supplementary gas into the heat treatment chamber, and the fact that leaked cooling medium can easily enter the material area when the cooling heat exchanger is located inside the heat treatment chamber. Summary of the Invention

[0005] In order to improve the problems of uneven heating of materials when supplementing gas in existing large box-type heat treatment furnaces, and the problem that leaked cooling medium can easily enter the material area when the cooling heat exchanger is set in the heat treatment chamber, this application provides a laminated foil heat treatment furnace.

[0006] The laminated foil heat treatment furnace provided in this application adopts the following technical solution: A laminated foil heat treatment furnace includes a main furnace body, the interior of which forms a sealed heat treatment chamber. A circulating heat assembly is disposed on the top of the main furnace body. The circulating heat assembly includes a circulating fan installed on the top of the main furnace body and a heating assembly passing through the heat treatment chamber. The gas control component includes an external integrated gas control valve frame, which includes a first gas inlet pipe and a second gas inlet pipe. The first gas inlet pipe is connected to the bottom of the main furnace body, and the second gas inlet pipe extends to the top of the main furnace body and is connected to the heat treatment chamber. An argon gas source and a protective gas source are respectively connected to the integrated gas control valve frame, and a flow control valve and a pressure reducing valve are connected in series on the pipes of the integrated gas control valve frame to regulate the flow rate and pressure of the gas blown into the heat treatment chamber. The gas supplemented through the second gas inlet pipe is mixed with the furnace gas at the circulating fan and then blown into the heat treatment chamber. A side-cooling component is located outside the main furnace body. A heat exchanger is installed inside the side-cooling component. The air inlet of the side-cooling component is connected to the top of the heat treatment chamber, and the air outlet of the side-cooling component is connected to the bottom of the heat treatment chamber.

[0007] By adopting the above technical solution, the problems of uneven heating of materials caused by directly blowing supplementary gas into the heat treatment chamber in existing large heat treatment furnaces, and the easy entry of cooling medium into the material area when the internal heat exchanger leaks, are improved. Multi-source gas regulation is achieved through an externally integrated gas control valve frame, and the supplementary cold gas is led to the top of the main furnace body via the second air inlet pipe. It mixes with the furnace gas at the circulating fan before being blown into the heat treatment chamber, reducing the direct impact of the low-temperature supplementary gas on the material and improving the uniformity of the temperature field and airflow distribution inside the furnace. Simultaneously, external circulation heat exchange is achieved using a bypass cooling component located outside the main furnace body, separating the heat exchanger from the material area inside the heat treatment chamber. This reduces the risk of cooling medium directly entering the material area when the heat exchanger leaks, and facilitates the inspection and maintenance of the heat exchanger.

[0008] Preferably, the bypass cooling assembly includes a bypass cooling shell, and the heat exchanger includes heat exchange pipes disposed inside the bypass cooling shell. Both ends of the heat exchange pipes penetrate the bypass cooling shell and extend to the outside of the bypass cooling shell. The joints and welds of the heat exchange pipes are disposed on the outside of the bypass cooling shell. Both the air inlet and air outlet of the bypass cooling assembly are equipped with isolation valves. A displacement gas passage is connected between the integrated pneumatic valve frame and the bypass cooling shell. The displacement gas passage is used to introduce inert gas into the bypass cooling shell before the isolation valve is opened to purge and replace residual air.

[0009] By adopting the above technical solutions, the problems of water leakage causing contamination of the high-temperature sealed furnace due to alternating hot and cold temperatures in the heat exchange unit, and the oxidation of materials caused by external air entrainment during cooling cycle switching are improved. The joints and welds of the heat exchange pipelines are all located on the outside of the bypass cooling shell, effectively blocking the impact of potential pipeline leaks on the internal environment of the heat treatment chamber from a physical structural perspective. Simultaneously, inert gas is introduced into the bypass cooling shell before the isolation valve is opened using a displacement gas path to purge and replace residual air, preventing the mixing of external air and other non-target gases during the cooling process, further enhancing the stability of the entire system in maintaining an oxygen-free or micro-oxygen environment.

[0010] Preferably, the circulating heat assembly further includes an air-sealing assembly; the circulating fan has a motor shaft that penetrates into the main furnace body, and the air-sealing assembly is sleeved at the penetration and mating point between the main furnace body and the motor shaft; the air-sealing assembly includes a wear-resistant carbon ring, and a gas channel is opened inside the wear-resistant carbon ring, the gas channel being connected to a protective gas source to form a positive pressure air wall at the rotation gap of the motor shaft.

[0011] By adopting the above technical solution, the problem of air leakage that easily occurs at dynamic joints such as the fan motor shaft in large heat treatment furnaces is improved. This application improves the overall airtightness of the main furnace body during dynamic operation by fitting a wear-resistant carbon ring with a gas channel at the joint between the main furnace body and the motor shaft, and by using a connected protective gas source to form a positive pressure gas wall at the rotating gap. This effectively displaces and prevents the infiltration of external air from the inside out, improving the overall airtightness of the main furnace body during dynamic operation and helping to maintain the required atmosphere in the heat treatment chamber for a long time.

[0012] Preferably, the circulating heat assembly further includes a flange connection assembly for fixing the circulating fan. The flange connection assembly includes a mating mounting flange and a base flange. A high-temperature resistant gasket is pressed between the mating surfaces of the mounting flange and the base flange, and an annular sealing water line is machined on the mating surface of the mounting flange or the base flange. The annular sealing water line is pressed and embedded in the high-temperature resistant gasket to form a static seal. The flange connection assembly also includes a fastening stud. The bottom end of the fastening stud is inserted into the threaded hole of the base flange, plugged and welded, and ground flat to seal the leakage channel of the threaded hole.

[0013] By adopting the above technical solutions, the sealing failure at the static connection of flanges in large heat treatment equipment under high-temperature operation and fan vibration conditions has been improved. By machining an annular sealing water line on the flange mating surface to press against the embedded high-temperature resistant gasket, the static sealing effect between flanges is enhanced. Simultaneously, the design of bottom-plugged and ground-flat fastening studs effectively blocks the channel for gas leakage along the through-holes, further improving the airtightness of the main furnace body at static assembly points and contributing to the stable maintenance of a micro-oxygen or oxygen-free atmosphere inside the furnace.

[0014] Preferably, a temperature measuring hole is provided on the side wall of the main furnace body, and an aviation plug is connected to the temperature measuring hole; the base of the aviation plug is welded and fixed to the outer wall of the side wall of the main furnace body, and the temperature measuring hole is used to insert a thermocouple so that the inserted thermocouple is in airtight communication with the heat treatment chamber through the aviation plug.

[0015] By adopting the above technical solution, the problem of air leakage from outside the furnace due to assembly gaps at the temperature sensing element connection points in traditional heat treatment furnaces is improved. By welding and fixing the external aviation plug base to the side wall of the main furnace body, and using this aviation plug to connect the thermocouple to the heat treatment chamber, accurate temperature monitoring inside the furnace is ensured while effectively improving the structural airtightness at the temperature sensing node, further reducing the risk of damage to the micro-oxygen or oxygen-free process environment inside the furnace.

[0016] Preferably, the top of the main furnace body is also equipped with a pressure relief assembly, which includes a diaphragm explosion-proof valve. The diaphragm explosion-proof valve is connected to the heat treatment chamber and is used to physically rupture and relieve pressure when the pressure inside the furnace reaches a preset threshold.

[0017] By adopting the above technical solutions, the safety hazards of large, enclosed heat treatment furnaces being prone to damage due to internal pressure overload during high-temperature operation and atmosphere charging and discharging are mitigated. The diaphragm-type explosion-proof valve provides a passive physical rupture relief floor, effectively improving the safety and reliability of the equipment under complex pneumatic control conditions.

[0018] Preferably, the gas control component further includes a negative pressure exhaust pipe and a negative pressure exhaust fan. The negative pressure exhaust pipe is configured as a manifold structure, which includes a main exhaust pipe and multiple vertical branch pipes spaced apart along the extension direction of the main exhaust pipe. The multiple vertical branch pipes all penetrate the top of the main furnace body and connect to different temperature zones in the heat treatment chamber. The main exhaust pipe is connected to the negative pressure exhaust fan for multi-point uniform suction of the gas in the heat treatment chamber and discharge it to the outside.

[0019] By adopting the above technical solution, the problems of localized waste gas retention and uneven exhaust efficiency caused by single-point extraction during the exhaust process of large heat treatment furnaces are improved. By configuring a manifold negative pressure exhaust structure including a main exhaust pipe and multiple vertical branch pipes, and utilizing a negative pressure exhaust fan to simultaneously and uniformly extract different temperature zones distributed throughout the heat treatment chamber, dead zones in the ultra-large furnace are effectively avoided, improving the thoroughness and uniformity of waste gas discharge and helping to ensure the consistency and stability of the process environment in all areas of the furnace.

[0020] Preferably, a static pressure premixing chamber is defined between the circulating heat assembly and the heat treatment chamber, and the second air inlet pipe is connected to the static pressure premixing chamber for gas premixing; a jet flow equalization plate is provided between the static pressure premixing chamber and the heat treatment chamber, and a plurality of jet pipes extending into the interior of the heat treatment chamber are arranged on the jet flow equalization plate. The plurality of jet pipes are arranged in an array, and the extension directions of adjacent jet pipes are inclined and staggered so that the ejected gas converges and collides in the heat treatment chamber.

[0021] By adopting the above technical solutions, the problems of excessive local temperature differences and uneven airflow for large-volume materials caused by direct blowing of cold gas into the furnace during conventional heat treatment equipment are improved. By setting up a static pressure premixing chamber, the gas supplied via the second inlet pipe can be buffered and premixed beforehand. Simultaneously, the array of inclined, intersecting jet pipes on the jet flow equalization plate causes multiple jets of gas to converge and collide before contacting the material, thereby dispersing the high-speed directional jet and transforming it into a gentle, highly enveloping, and uniformly disturbed airflow. This effectively improves the uniformity of the flow field and temperature field within the heat treatment chamber, which is beneficial for ensuring the heat treatment quality of large-volume laminated foil materials.

[0022] Preferably, the main furnace body is a split-type modular structure.

[0023] By adopting the above technical solutions, the limitations faced by ultra-large heat treatment equipment in overall manufacturing and transportation have been improved, as well as the issue of furnace structure deformation caused by thermal stress concentration under high-temperature operating conditions. This not only facilitates the disassembly and on-site assembly of large furnace bodies but also further enhances the service life and overall stability of the large heat treatment furnace structure.

[0024] Preferably, the main furnace body is formed by splicing and locking multiple furnace body side plates and a top plate.

[0025] By adopting the above technical solutions, the limitations imposed on ultra-large heat treatment equipment during long-distance transportation and on-site hoisting due to its excessive overall size have been improved. By designing the main furnace body as a segmented, modular structure formed by the splicing and locking of multiple furnace side plates and top plates, the ultra-long, ultra-large volume furnace body can be disassembled and transported in a modular manner, and easily reassembled on-site. This effectively reduces the logistical and deployment difficulties of large heat treatment equipment, while also facilitating subsequent partial disassembly and maintenance.

[0026] In summary, this application includes at least one of the following beneficial technical effects: This application connects the second air inlet pipe to the circulating fan and configures a jet flow equalization plate with inclined cross-array jet pipes between the static pressure premixing chamber and the heat treatment chamber. This allows the supplemented cold gas to be fully mixed with the high-temperature gas in the furnace first, and then transformed into a gentle turbulent airflow in the form of multiple jets converging and colliding. This improves the situation in existing large heat treatment furnaces where direct blowing of cold gas easily leads to excessive local temperature differences and uneven airflow for large-capacity materials, and enhances the uniformity of the temperature field and flow field distribution in the furnace.

[0027] This application addresses the issue of external contaminants by placing the joints and welds of the heat exchange pipelines of the bypass cooling component on the outside of the bypass cooling shell and by introducing inert gas into the bypass cooling shell before the isolation valve is opened using a displacement gas path to purge residual air. This approach effectively blocks the infiltration of external contaminants from both a physical structural and process control perspective. It also improves the situation where water vapor leakage is caused by thermal stress fatigue of the heat exchanger and the material becomes damp and oxidized due to the entrainment of external impurities during cooling switching. This enhances the safety of the high-temperature sealed furnace under alternating operating conditions.

[0028] This application strengthens the gap-blocking capability from both dynamic operation and static assembly perspectives by installing a wear-resistant carbon ring with a gas channel at the mating point of the motor shaft to form a positive pressure air wall, and at the same time, it is combined with a flange connection assembly with an annular sealing water line pressure gasket and a fastening stud weld design. This improves the insufficient air tightness at the dynamic-static junction of large box-type heat treatment furnaces, reduces the risk of external oxygen infiltration during high-temperature sintering processes, and helps to maintain a stable micro-oxygen or oxygen-free environment inside the furnace for a long time. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a laminated foil heat treatment furnace according to an embodiment of this application. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a laminated foil heat treatment furnace according to an embodiment of this application. Figure 2 ; Figure 3 This is a cross-sectional view of a laminated foil heat treatment furnace according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a laminated foil heat treatment furnace according to an embodiment of this application. Figure 3 ; Figure 5 yes Figure 2 Enlarged view of point A in the middle; Figure 6 yes Figure 1 Enlarged view of point B in the middle; Figure 7 yes Figure 3 Enlarged view of point C in the middle; Figure 8 This is a cross-sectional view of the circulating fan in an embodiment of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Main furnace body; 2. Heat treatment chamber; 3. Circulating heat assembly; 4. Circulating fan; 5. Heating assembly; 6. Pneumatic control assembly; 7. Integrated pneumatic control valve frame; 8. First air inlet pipe; 9. Second air inlet pipe; 10. Bypass cooling assembly; 11. Heat exchanger; 12. Bypass cooling shell; 13. Top plate; 14. Isolation valve; 15. Replacement gas passage; 16. Gas seal assembly; 17. Flange connection assembly; 18. Temperature measuring hole; 19. Furnace body side plate; 20. Pressure relief assembly; 21. Negative pressure exhaust pipe; 22. Negative pressure exhaust fan; 23. Static pressure premixing chamber; 24. Injection flow equalization plate; 25. Injection pipe. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 - Appendix Figure 8 This application will be described in further detail.

[0032] This embodiment provides a laminated foil heat treatment furnace, such as Figure 1 and Figure 2 As shown, it is mainly used in composite aluminum foil for energy storage batteries, data centers and other fields, such as the degreasing and semi-melting sintering process for large-capacity loading of 30 tons.

[0033] like Figure 2 As shown, the heat treatment furnace has a segmented assembly structure, which is formed by splicing and locking multiple furnace body side plates 19 and top plate 13. In order to facilitate the transportation and on-site assembly of ultra-large equipment, and at the same time release high-temperature thermal stress, the main furnace body 1 is designed as a split-joint structure. The outer shell and internal components of the main furnace body 1 include a first module and a second module connected along the joint.

[0034] This application discloses a laminated foil heat treatment furnace. The laminated foil heat treatment furnace mainly includes: a main furnace body 1, a circulating heat assembly 3, a gas control assembly 6, and a bypass cooling assembly 10.

[0035] like Figure 3 As shown, a sealed heat treatment chamber 2 is formed inside the main furnace body 1, which is used to contain the laminated foil material.

[0036] like Figure 4 As shown, the circulating heat assembly 3 is located in the main furnace body 1, including a circulating fan 4 installed on the top of the main furnace body 1, and heating components 5, such as multiple sets of electric heaters distributed in a disc shape, that pass through the heat treatment chamber 2. The gas control assembly 6 is responsible for the precise scheduling of multi-source gases; the bypass cooling assembly 10 is located outside the main furnace body 1 and is used to achieve external circulation cooling of the gas inside the furnace while isolating it from external air.

[0037] To address the oxygen supply control during the degreasing stage and the inert gas replenishment during the sintering stage, this application includes an external integrated gas control valve frame 7. This integrated gas control valve frame 7 is connected to both an argon gas source and a protective gas source, and its pipeline is equipped with a flow control valve and a pressure reducing valve connected in series for precise regulation of the gas flow rate and pressure blown into the heat treatment chamber 2.

[0038] The integrated pneumatic valve frame 7 leads to the first intake pipe 8 and the second intake pipe 9. First air inlet pipe 8: connected to the bottom of the main furnace body 1, mainly used for rapid replacement of large flow of argon gas before cooling.

[0039] The second air intake pipe 9 extends to the top of the main furnace body 1 and connects to the heat treatment chamber 2, specifically connecting to the air intake of the circulating fan 4.

[0040] like Figure 7 As shown, the static pressure premixing and cross-jet mechanism involves defining a large-volume static pressure premixing chamber 23 between the circulating heat assembly 3 and the heat treatment chamber 2. Low-temperature cold air, supplied via the second air inlet pipe 9, is drawn in by the circulating fan 4 and first thoroughly agitates and premixes with the high-temperature gas inside the furnace within the static pressure premixing chamber 23. A jet flow equalization plate 24 is installed between the static pressure premixing chamber 23 and the heat treatment chamber 2, with multiple jet pipes 25 extending into the heat treatment chamber 2 arranged on the jet flow equalization plate 24. These multiple jet pipes 25 are arranged in an array, with adjacent jet pipes 25 extending in an inclined and staggered direction. Under the influence of pressure difference, the mixed gas is ejected through the jet pipes 25. Due to the inclined and intersecting arrangement of adjacent jet pipes 25, the ejected high-speed gas undergoes a strong convergence and collision within the heat treatment chamber 2 before contacting the material, thereby transforming the directional jet into a soft and uniform turbulent airflow that envelops the material over a large area.

[0041] To maintain the ppm-level micro-oxygen or oxygen-free environment required for the semi-molten sintering process, this embodiment incorporates extremely high-standard airtight structures at both dynamic and static junctions: The circulating heat exchanger 3 also includes an airtight assembly 16. The circulating fan 4 has a motor shaft that penetrates into the main furnace body 1, and the airtight assembly 16 is fitted at the point where the main furnace body 1 and the motor shaft pass through. The airtight assembly 16 has a wear-resistant carbon ring embedded inside, and a gas channel is opened inside the wear-resistant carbon ring. This gas channel is connected to a protective gas source. When the equipment is running, high-pressure gas fills the gap through the channel, forming a positive pressure gas wall that is pushed outward at the rotation gap of the motor shaft, preventing the infiltration of external air.

[0042] like Figure 8As shown, the flange connection assembly 17 for fixing the circulating fan 4 includes a mounting flange and a base flange. A high-temperature resistant gasket is pressed between the mating surfaces of the mounting flange and the base flange, and an annular sealing water line is machined on the mating surface of either the mounting flange or the base flange. When the flange is tightened, the annular sealing water line is deeply embedded in the gasket to form a labyrinth-type air-blocking ring. At the same time, the bottom end of the fastening stud of the flange connection assembly 17 is inserted into the bolt hole of the base flange, plugged and welded, and ground smooth, physically sealing the leakage channel through the bolt hole.

[0043] like Figure 5 As shown, a temperature measuring hole 18 is provided on the side wall of the main furnace body 1, and an aviation plug is connected to the temperature measuring hole 18. The base of the aviation plug is fully welded to the outer wall surface of the side wall of the main furnace body 1. The temperature measuring hole 18 is used to insert a thermocouple, so that the inserted thermocouple is electrically connected and airtightly connected to the heat treatment chamber 2 through the aviation plug.

[0044] like Figure 6 As shown, after sintering at 600℃, the material needs to be rapidly cooled in an oxygen-free environment. The bypass cooling component 10 is located outside the main furnace body 1, and a heat exchanger 11 is installed inside it.

[0045] The air inlet of the bypass cooling component 10 is connected to the top of the heat treatment chamber 2, and the air outlet is connected to the bottom of the heat treatment chamber 2.

[0046] Leakage prevention physical isolation: Both ends of the heat exchange pipeline penetrate the bypass cooling shell 12 and extend to the outside. The joints and welds of the heat exchange pipeline are all located on the outside of the bypass cooling shell 12. If fatigue microcracks occur in the pipeline due to alternating hot and cold temperatures, the cooling medium will only be discharged into the external environment of the workshop and will not be able to enter the bypass cooling shell 12 and the heat treatment chamber 2.

[0047] Both the air inlet and outlet of the bypass cooling assembly 10 are equipped with large-diameter isolation valves 14. A displacement gas passage 15 connects the integrated pneumatic control valve frame 7 and the bypass cooling shell 12. Before the cooling process starts and the isolation valve 14 is opened, the integrated pneumatic control valve frame 7 first introduces a large amount of argon gas into the bypass cooling shell 12 through the displacement gas passage 15 to thoroughly purge and replace the air remaining in the shell before opening the isolation valve 14 to introduce hot air into the furnace, preventing residual air from contaminating the furnace.

[0048] The bypass cooling housing 12 is also equipped with a displacement exhaust pipe. During the displacement process, the isolation valves at the air inlet and air outlet of the bypass cooling component 10 are closed, and the inert gas enters the bypass cooling housing through the displacement gas path and pushes the residual air in the bypass cooling housing 12 to be discharged through the displacement exhaust pipe.

[0049] The pneumatic control assembly 6 also includes a negative pressure exhaust pipe 21 and a negative pressure exhaust fan 22. The drive motor of the negative pressure exhaust fan 22 is connected to the fan shaft via a belt drive mechanism to keep the drive motor away from the high-temperature airflow. The negative pressure exhaust pipe 21 is configured as a manifold structure, including a main exhaust pipe and multiple vertical branch pipes spaced apart along the extension direction of the main exhaust pipe. The vertical branch pipes penetrate the top of the main furnace body 1 and extend into different temperature zones. During the 300℃ degreasing stage, the negative pressure exhaust fan 22 uses multiple branch pipes to perform multi-point uniform suction of the extra-long heat treatment chamber 2, effectively and synchronously discharging the volatile organic waste gas to the outside.

[0050] The top of the main furnace body 1 is equipped with a pressure relief assembly 20, including a diaphragm explosion-proof valve, which is used to physically rupture and relieve pressure when the pressure inside the furnace reaches a preset threshold. The diaphragm explosion-proof valve is connected to the heat treatment chamber 2, providing an overpressure release channel.

[0051] The implementation principle of a laminated foil heat treatment furnace according to an embodiment of this application is as follows: Step 1: Degreasing Stage. The heating assembly 5 is activated to raise the temperature of the heat treatment chamber 2 inside the main furnace body 1 to the degreasing process temperature, approximately 300°C. For oxygen-deficient environments such as high altitudes, the protective gas source and flow control valve on the integrated gas control valve frame 7 precisely replenish the oxygen required for the oxidation reaction inside the furnace. During this process, the composite organic matter on the surface of the laminated foil undergoes oxidation and volatilization, generating a large amount of waste gas. At this time, the negative pressure exhaust fan 22 is activated. Under negative pressure, the waste gas is simultaneously drawn through multiple vertical branch pipes of the manifold structure to the main exhaust pipe and discharged externally, avoiding dead zones and waste gas retention inside the long, narrow furnace chamber.

[0052] Step Two: Sintering Stage. The heat treatment chamber 2 is further heated to the sintering process temperature of the semi-molten aluminum foil, approximately 600°C or higher. The equipment relies on a tight dynamic and static sealing system, including a positive pressure air wall formed by wear-resistant carbon rings at the motor shaft gap, as well as annular sealing water lines, stud hole plug welding, and aviation plugs, to reduce the infiltration of external oxygen. When slow pressurization or adjustment of the furnace atmosphere is required, low-temperature gas, such as argon, is precisely guided to the suction port of the top circulating fan 4 via the second air inlet pipe 9. After being forcibly drawn in, the cold gas is first violently agitated and premixed with the high-temperature hot air in the furnace within the large static pressure premixing chamber 23; subsequently, the uniformly mixed gas is forced into the jet flow equalization plate 24. Due to the inclined cross-array arrangement of multiple jet pipes 25 on the flow equalization plate, the high-speed airflows collide with each other before contacting the material below, instantly dispersing the directional jet into a gentle, dead-angle-free turbulent uniform temperature air field, uniformly enveloping the 30-ton-class large-capacity laminated foil material. If the pressure inside the furnace exceeds the standard during this stage, the diaphragm explosion-proof valve will physically rupture to release the pressure.

[0053] Step 3: Furnace cleaning and replacement stage. Before cooling down after the sintering process, to prevent external air and other non-target gases from being drawn into the furnace when the bypass cooling component 10 is turned on, the system enters the cleaning process. First, high-purity argon gas is rapidly introduced into the bottom of the main furnace body 1 through the integrated gas control valve frame 7 and the first air inlet pipe 8. Taking advantage of the high density of argon gas, the residual air in the furnace is squeezed out from bottom to top. Simultaneously, the integrated gas control valve frame 7 introduces inert gas into the bypass cooling shell 12, which is in the closed state of the isolation valve 14, through the external replacement gas passage 15. This thoroughly cleans the residual air inside the bypass cooling shell 12, ensuring that the entire circulation loop reaches an extremely high purity oxygen-free state.

[0054] Step 4: During the bypass cooling stage, after both the main furnace body 1 and the bypass cooling shell 12 have completed oxygen-free replacement, the isolation valve 14 at the air inlet and outlet of the bypass cooling component 10 is opened. High-temperature pure argon gas at the top of the heat treatment chamber 2 is extracted and introduced into the bypass cooling shell 12, flowing over the surface of the heat exchange pipes for heat exchange and cooling. Under extreme alternating thermal stress conditions, because the joints and welds of the heat exchange pipes are physically isolated on the outside of the bypass cooling shell 12, even if a slight water vapor leak occurs due to thermal expansion and contraction, moisture is unlikely to directly enter the internal air duct, thus reducing the risk of the cooling medium entering the heat treatment chamber with the circulating gas. The cooled gas is then returned to the bottom of the heat treatment chamber 2 from the outlet of the bypass cooling component 10, circulating repeatedly until the laminated foil is safely cooled to the target temperature in a strictly controlled water and oxygen environment.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A laminated foil heat treatment furnace, characterized in that, include: The main furnace body (1) forms a sealed heat treatment chamber (2) inside; A circulating heat assembly (3) is disposed on the top of the main furnace body (1). The circulating heat assembly (3) includes a circulating fan (4) installed on the top of the main furnace body (1) and a heating assembly (5) passing through the heat treatment chamber (2). The gas control component (6) includes an external integrated gas control valve frame (7), which includes a first gas inlet pipe (8) and a second gas inlet pipe (9). The first gas inlet pipe (8) is connected to the bottom of the main furnace body (1), and the second gas inlet pipe (9) extends to the top of the main furnace body (1) and is connected to the heat treatment chamber (2). An argon gas source and a protective gas source are respectively connected to the integrated gas control valve frame (7), and a flow control valve and a pressure reducing valve are connected in series on the pipe of the integrated gas control valve frame (7) to regulate the flow rate and pressure of the gas blown into the heat treatment chamber (2). The gas supplemented by the second gas inlet pipe (9) is mixed with the gas in the furnace at the circulating fan (4) and then blown into the heat treatment chamber (2). A side-cooling component (10) is located outside the main furnace body (1). A heat exchanger (11) is provided inside the side-cooling component (10). The air inlet of the side-cooling component (10) is connected to the top of the heat treatment chamber (2), and the air outlet of the side-cooling component (10) is connected to the bottom of the heat treatment chamber (2).

2. The laminated foil heat treatment furnace according to claim 1, characterized in that, The bypass cooling assembly (10) includes a bypass cooling shell (12), and the heat exchanger (11) includes a heat exchange pipeline disposed inside the bypass cooling shell (12). The two ends of the heat exchange pipeline penetrate the bypass cooling shell (12) and extend to the outside of the bypass cooling shell (12). The splice joints and welds of the heat exchange pipeline are disposed on the outside of the bypass cooling shell (12). The air inlet and air outlet of the bypass cooling assembly (10) are both equipped with isolation valves (14). The integrated pneumatic control valve frame (7) is connected to the bypass cooling shell (12) by a displacement gas passage (15). The displacement gas passage (15) is used to introduce inert gas into the bypass cooling shell (12) before the isolation valve (14) is opened to purge and replace residual air.

3. The laminated foil heat treatment furnace according to claim 1, characterized in that, The circulating heat assembly (3) also includes an air-sealing assembly (16). The circulating fan (4) has a motor shaft that penetrates into the main furnace body (1). The air-sealing assembly (16) is fitted at the penetration and mating point between the main furnace body (1) and the motor shaft. The air-sealing assembly (16) includes a wear-resistant carbon ring. A gas channel is opened inside the wear-resistant carbon ring. The gas channel is connected to a protective gas source to form a positive pressure gas wall at the rotation gap of the motor shaft.

4. The laminated foil heat treatment furnace according to claim 3, characterized in that, The circulating heat assembly (3) further includes a flange connection assembly (17) for fixing the circulating fan (4). The flange connection assembly (17) includes a mating mounting flange and a base flange. A high-temperature resistant gasket is pressed between the mating surfaces of the mounting flange and the base flange. An annular sealing water line is machined on the mating surface of the mounting flange or the base flange. The annular sealing water line is pressed into the high-temperature resistant gasket to form a static seal. The flange connection assembly (17) further includes a fastening stud. The bottom end of the fastening stud is inserted into the threaded hole of the base flange for plug welding and grinding to seal the leakage channel of the threaded hole.

5. The laminated foil heat treatment furnace according to claim 1, characterized in that, The main furnace body (1) has a temperature measuring hole (18) on its side wall, and an aviation plug is connected to the temperature measuring hole (18). The base of the aviation plug is welded and fixed to the outer wall of the side wall of the main furnace body (1). The temperature measuring hole (18) is used to insert a thermocouple so that the inserted thermocouple is in airtight communication with the heat treatment chamber (2) through the aviation plug.

6. The laminated foil heat treatment furnace according to claim 1, characterized in that, The top of the main furnace body (1) is also equipped with a pressure relief assembly (20), which includes a diaphragm explosion-proof valve. The diaphragm explosion-proof valve is connected to the heat treatment chamber (2) and is used to physically rupture and relieve pressure when the pressure inside the furnace reaches a preset threshold.

7. The laminated foil heat treatment furnace according to claim 1, characterized in that, The gas control component (6) also includes a negative pressure exhaust pipe (21) and a negative pressure exhaust fan (22). The negative pressure exhaust pipe (21) is configured as a manifold structure, which includes a main exhaust pipe and multiple vertical branch pipes arranged at intervals along the extension direction of the main exhaust pipe. The multiple vertical branch pipes penetrate the top of the main furnace body (1) and are connected to different temperature zones in the heat treatment chamber (2). The main exhaust pipe is connected to the negative pressure exhaust fan (22) for multi-point uniform suction of the gas in the heat treatment chamber (2) and discharge it to the outside.

8. The laminated foil heat treatment furnace according to claim 1, characterized in that, A static pressure premixing chamber (23) is defined between the circulating heat assembly (3) and the heat treatment chamber (2). The second air inlet pipe (9) is connected to the static pressure premixing chamber (23) for gas premixing. A jet flow equalization plate (24) is provided between the static pressure premixing chamber (23) and the heat treatment chamber (2). A plurality of jet pipes (25) extending into the heat treatment chamber (2) are arranged on the jet flow equalization plate (24). The plurality of jet pipes (25) are arranged in an array, and the extension directions of adjacent jet pipes (25) are inclined and staggered so that the ejected gas converges and collides in the heat treatment chamber (2).

9. The laminated foil heat treatment furnace according to claim 8, characterized in that, The main furnace body (1) is a split-type structure.

10. The heat treatment furnace for laminated foil according to any one of claims 1 to 9, characterized in that, The main furnace body (1) is formed by splicing and locking multiple furnace body side plates (19) and top plate (13).

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