Electronic aluminum foil vacuum annealing inert gas preheating system

Abstract

The utility model relates to the technical field of electronic aluminum foil production, in particular to an inert gas preheating system for electronic aluminum foil vacuum annealing, which is characterized in that a storage tank is communicated with a liquid outlet pipeline, the liquid outlet pipeline is communicated with an exhaust component and a liquid conveying pipeline, and the liquid conveying pipeline is communicated with a liquid-gas conversion component and a conveying pipeline; the main pipeline is communicated with the liquid-gas conversion assembly and the conveying pipeline, a gas drying machine is arranged on the main pipeline, and a plurality of kiln heating assemblies are distributed on the main pipeline at intervals; the furnace heating assembly comprises a furnace, a gas conveying branch pipe and a furnace heating belt, the furnace heating belt is arranged in the furnace wall of the furnace in a surrounding mode, one end of the gas conveying branch pipe is communicated with the main pipeline, and the other end of the gas conveying branch pipe is arranged in the furnace wall in a surrounding mode and extends into the furnace. According to the utility model, inert gas is heated in a preheating manner, so that the temperature of the inert gas entering the kiln is increased; and meanwhile, inert gas can be conveniently introduced into the furnace kiln in winter.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic aluminum foil production, and particularly relates to a preheating system for inert gas in vacuum annealing of electronic aluminum foil. Background Art

[0002] With the extensive progress of science and technology and power applications, the use of electronic aluminum foil for aluminum electrolytic capacitors is increasing. Since the types and specifications of products that require electronic aluminum foil are becoming more and more diverse, the requirements for the specifications of aluminum foil are also getting higher and higher. A solidified production process and stable production atmosphere control are the top priorities for improving product quality. During the production of electronic aluminum foil, it is necessary to introduce inert gas into the furnace to avoid the oxidation reaction caused by the contact of pure aluminum with oxygen. The oxidation reaction will lead to a decrease in the quality of aluminum and affect the performance and use of the final electronic aluminum foil. The use of an inert gas heat exchange system with automatic temperature control has greatly increased the temperature of the supplied inert gas, improved the efficiency of furnace cooling, saved the production costs of gas heating and furnace cooling, and provided a more accurate protective atmosphere for the vacuum annealing of electronic aluminum foil.

[0003] During the operation of the existing furnace inert gas supply system, only the control of the inert gas flow rate can be achieved. After the liquefied inert gas undergoes liquid-gas conversion, it will produce inert gas with a relatively low temperature. When the inert gas with a relatively low temperature is filled into the furnace, it will cause an error in the annealing atmosphere in the furnace, resulting in a large temperature difference in each working area in the furnace, seriously affecting the quality and normal use of electronic aluminum foil and increasing the scrap rate. At the same time, when the liquefied inert gas undergoes liquid-gas conversion in winter, the pipeline of the vaporizer is prone to icing, and the gas release port of the frozen vaporizer pipeline makes it difficult for the inert gas to be released. Summary of the Invention

[0004] In order to solve the problems that the inert gas produced after the conversion of liquefied inert gas has a relatively low temperature and the inert gas is not easily released in winter when the existing furnace inert gas supply system works, the utility model provides a preheating system for inert gas in vacuum annealing of electronic aluminum foil. The system heats the inert gas by means of preheating to increase the temperature of the inert gas entering the furnace, so as to avoid errors in the annealing atmosphere in the furnace and large errors in each working area in the furnace. At the same time, it is still convenient to introduce inert gas into the furnace in winter.

[0005] To achieve the above object, the technical solution of the present utility model is: an electronic aluminum foil vacuum annealing inert gas preheating system, including a storage tank, and also including a main pipeline. An outlet pipeline is connected to the storage tank. The outlet pipeline is connected to an exhaust assembly and an infusion pipeline. The infusion pipeline is connected to a liquid-gas conversion assembly and a conveying pipeline. A check valve is provided on the conveying pipeline. The storage tank is used to store liquefied inert gas. The liquefied inert gas can be transported to the liquid-gas conversion assembly through the outlet pipeline. The liquefied inert gas is subjected to liquid-gas conversion by the liquid-gas conversion assembly to generate inert gas and increase the temperature of the inert gas. When the gas release port of the vaporizer pipeline freezes in winter, the liquefied inert gas can be directly transported through the conveying pipeline.

[0006] The main pipeline is connected to the liquid-gas conversion assembly and the conveying pipeline. A gas dryer is provided on the main pipeline. A plurality of furnace heating assemblies are arranged at intervals on the main pipeline. The gas dryer can dry the inert gas generated after liquid-gas conversion, and the furnace heating assemblies can perform secondary heating on the inert gas.

[0007] The furnace heating assembly includes a furnace, an air delivery branch pipe, and a furnace heating belt. The furnace heating belt is arranged around the inner part of the furnace wall of the furnace. One end of the air delivery branch pipe is connected to the main pipeline, and the other end of the air delivery branch pipe is arranged around the inner part of the furnace wall of the furnace and extends into the interior of the furnace. The air delivery branch pipe is connected to an air outlet pipeline located inside the furnace. The inert gas is subjected to secondary heating by the furnace heating belt before entering the furnace to increase the temperature of the inert gas. Among them, the preheated inert gas can be introduced into the furnace through the air outlet pipeline.

[0008] Further, the exhaust assembly includes an exhaust pipeline connected to the outlet pipeline, and a second emptying valve is provided on the exhaust pipeline. When the temperature is relatively high in summer and gaseous inert gas appears in the liquefied inert gas in the storage tank, the gaseous inert gas in the storage tank can be discharged through the exhaust pipeline.

[0009] Further, the liquid-gas conversion assembly includes a circulating water tank and a vaporizer arranged inside the circulating water tank. The input end of the vaporizer is connected to a conversion pipeline. One end of the conversion pipeline extends outside the circulating water tank and is connected to the infusion pipeline. A flow control valve is provided on the conversion pipeline. Circulating hot water is introduced into the circulating water tank, and the vaporizer is used to perform heat exchange between the liquefied inert gas and the circulating hot water to achieve the effect of liquid-gas conversion of the liquefied inert gas.

[0010] Further, the output end of the vaporizer is connected to a gas pipeline, and the gas pipeline is connected to the main pipeline. A gas thermometer is provided on the gas pipeline. The liquefied inert gas is subjected to liquid-gas conversion by the vaporizer to form gaseous inert gas and is transported to the main pipeline through the gas pipeline.

[0011] Further, an inlet pipe and an outlet pipe are connected to the circulating water tank, and control valves are provided on both the inlet pipe and the outlet pipe. Circulating hot water is introduced into the circulating water tank through the inlet pipe, and the circulating hot water in the circulating water tank can be discharged through the outlet pipe.

[0012] Further, a flow regulating valve and a gas flow meter are provided on the gas delivery branch pipe. The gas delivery branch pipe is connected to an exhaust pipe, and an exhaust valve I is provided on the exhaust pipe. The inert gas waste gas with a relatively low temperature and not meeting the production requirements of electronic aluminum foil can be discharged through the exhaust pipe.

[0013] Further, a plurality of gas outlet branch pipes are arranged at intervals on the gas outlet pipe, and a plurality of gas outlet holes are evenly opened on the gas outlet branch pipes. The preheated inert gas is introduced into the furnace through the gas outlet holes on the gas outlet branch pipes.

[0014] Through the above technical solutions, the beneficial effects of the present utility model are as follows:

[0015] The structure of the present utility model is reasonable and has good use effects. The inert gas is heated by a preheating method to increase the temperature of the inert gas entering the furnace, so as to avoid errors in the annealing atmosphere in the furnace and large errors in each working area in the furnace, improve the quality of electronic aluminum foil, and reduce the scrap rate of electronic aluminum foil; at the same time, even if the gas release port of the vaporizer pipeline freezes in winter, inert gas can still be introduced into the furnace.

[0016] The present utility model transports the liquefied inert gas in the storage tank to the vaporizer in the circulating water tank through an infusion pipeline and a conversion pipeline. The vaporizer performs a liquid-gas conversion operation on the liquefied inert gas to generate gaseous inert gas and perform a primary heating on the inert gas; and the inert gas is secondarily heated by the furnace heating belt in the furnace wall and the temperature of the furnace wall, so as to increase the temperature of the inert gas entering the furnace, achieve the effect of preheating the inert gas and avoiding errors in the annealing atmosphere in the furnace and large errors in each working area in the furnace, provide a guarantee for more accurately realizing the temperature uniformity of each heating zone of the furnace, and improve the finished product rate of electronic aluminum foil.

[0017] Circulating water for cooling the furnace wall is introduced into the circulating water tank of the present utility model. The vaporizer is used to perform heat exchange between the circulating water and the liquefied inert gas, which not only increases the temperature of the inert gas but also reduces the temperature of the circulating water.

[0018] When ice forms at the gas release port of the vaporizer pipeline during winter use of the utility model, liquefied inert gas is directly sent into the main pipeline and the gas transmission branch pipe through the transmission pipeline, and the liquefied inert gas is directly heated by the furnace heating belt in the furnace wall and the temperature of the furnace wall, so that the liquefied inert gas does not pass through the vaporizer, achieving the effect that inert gas can still be introduced into the furnace even when the gas release port of the vaporizer pipeline freezes in winter. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of an inert gas preheating system for vacuum annealing of electronic aluminum foil of the utility model;

[0020] Figure 2 is a schematic structural diagram of the furnace of the utility model.

[0021] The reference numerals in the drawings are: 1 is a storage tank, 2 is a liquid outlet pipeline, 3 is a liquid infusion pipeline, 4 is a transmission pipeline, 5 is a one-way valve, 6 is a conversion pipeline, 7 is a flow control valve, 8 is a circulating water tank, 9 is a water inlet pipeline, 10 is a water outlet pipeline, 11 is a control valve, 12 is a vaporizer, 13 is a gas pipeline, 14 is a main pipeline, 15 is a gas dryer, 16 is a furnace, 17 is a gas transmission branch pipe, 18 is a flow regulating valve, 19 is an exhaust pipeline, 20 is a first exhaust valve, 21 is a furnace heating belt, 22 is an air outlet pipeline, 23 is an air outlet branch pipe, 24 is an exhaust pipeline, 25 is a second exhaust valve. Detailed Embodiment

[0022] The following further describes the utility model in conjunction with the drawings and the detailed embodiment:

[0023] As Figures 1 to 2 shown, an inert gas preheating system for vacuum annealing of electronic aluminum foil includes a storage tank 1 and also includes a main pipeline 14. An outlet pipeline 2 is connected to the storage tank 1. The outlet pipeline 2 is connected to an exhaust assembly and a liquid infusion pipeline 3. The liquid infusion pipeline 3 is connected to a liquid-gas conversion assembly and a transmission pipeline 4. A one-way valve 5 is provided on the transmission pipeline 4. In this embodiment, liquefied inert gas is stored in the storage tank 1, and the liquefied inert gas in the storage pipe 1 is transported to the liquid-gas conversion assembly through the outlet pipeline 2 and the liquid infusion pipeline 3. The liquid-gas conversion assembly performs liquid-gas conversion work on the liquefied inert gas to form gaseous inert gas and performs primary heating on the inert gas; when the temperature is relatively high in summer, after part of the liquefied inert gas in the storage tank 1 forms gaseous inert gas, the gaseous inert gas in the storage tank 1 can be discharged through the exhaust assembly to avoid excessive pressure in the storage tank 1.

[0024] The main pipeline 14 is connected to the liquid-gas conversion component and the delivery pipeline 4. A gas dryer 15 is provided on the main pipeline 14, and a plurality of furnace heating components are arranged at intervals on the main pipeline 14. In this embodiment, the number of furnace heating components is five. When the liquefied inert gas is converted into gaseous inert gas through liquid-gas conversion of the liquid-gas conversion component, the gas dryer 15 performs a drying operation on the inert gas, and then performs secondary heating through the furnace heating components; when it is impossible to transport the liquefied inert gas to the liquid-gas conversion component in winter, the liquefied inert gas can be directly transported to the main pipeline 14 through the delivery pipeline 4, and the furnace heating components perform the liquid-gas conversion operation and heating on the liquefied inert gas.

[0025] The furnace heating component includes a furnace 16, a gas delivery branch pipe 17, and a furnace heating belt 21. The furnace heating belt 21 is arranged around the inner wall of the furnace wall of the furnace 16. One end of the gas delivery branch pipe 17 is connected to the main pipeline 14, and the other end of the gas delivery branch pipe 17 is arranged around the inner wall of the furnace wall of the furnace 16 and extends into the interior of the furnace 16. The gas delivery branch pipe 17 is connected to an air outlet pipe 22 located inside the furnace 16. In this embodiment, during the process of transporting the inert gas in the gas delivery branch pipe 17 located in the furnace wall of the furnace 16, the temperature of the furnace heating belt 21 and the furnace wall of the furnace 16 perform secondary heating on the inert gas to increase the temperature of the inert gas before entering the furnace 16, and heat the temperature of the inert gas to be maintained within ±10 degrees Celsius of the annealing temperature inside the furnace 16.

[0026] The exhaust component includes an exhaust pipeline 24 connected to the liquid outlet pipeline 2, and an emptying valve II 25 is provided on the exhaust pipeline 24. In this embodiment, when the temperature is relatively high in summer and part of the liquefied inert gas in the storage tank 1 forms gaseous inert gas, the emptying valve II 25 is opened, and the gaseous inert gas in the storage tank 1 is discharged successively through the liquid outlet pipeline 2 and the exhaust pipeline 24.

[0027] The liquid-gas conversion component includes a circulation water tank 8 and a vaporizer 12 disposed inside the circulation water tank 8. The input end of the vaporizer 12 is connected with a conversion pipeline 6. One end of the conversion pipeline 6 extends outside the circulation water tank 8 and is communicated with an infusion pipeline 3. A flow control valve 7 is arranged on the conversion pipeline 6. In this embodiment, circulating hot water generated by cooling the wall of the furnace kiln 16 is introduced into the circulation water tank 8. The circulating hot water submerges the vaporizer 12. Multiple vaporizers 12 can be installed in the circulation water tank 8, and the multiple vaporizers 12 can be fixed in series or in parallel in the circulation water tank 8. The liquefied inert gas in the storage tank 1 sequentially enters the vaporizer 12 through the liquid outlet pipeline 2, the infusion pipeline 3 and the conversion pipeline 6. The vaporizer 12 performs a liquid-gas conversion operation on the liquefied inert gas. The liquefied inert gas exchanges heat with the circulating hot water. The liquefied inert gas is heated to form gaseous inert gas, and the temperature of the circulating hot water decreases. The flow control valve 7 can control the flow rate of the liquefied inert gas delivered to the vaporizer 12.

[0028] The output end of the vaporizer 12 is connected with a gas pipeline 13. The gas pipeline 13 is communicated with the main pipeline 14. A gas thermometer is arranged on the gas pipeline 13. In this embodiment, the inert gas generated by the vaporizer 12 is delivered to the main pipeline 14 through the gas pipeline 13. The gas dryer 15 dries the inert gas. The gas thermometer monitors the temperature of the inert gas discharged from the vaporizer 12.

[0029] An inlet pipeline 9 and an outlet pipeline 10 are communicated with the circulation water tank 8. Control valves 11 are arranged on both the inlet pipeline 9 and the outlet pipeline 10. In this embodiment, circulating hot water generated by cooling the wall of the furnace kiln 16 can be introduced into the circulation water tank 8 through the inlet pipeline 9, and the circulating hot water in the circulation water tank 8 can be discharged through the outlet pipeline 10. The control valve 11 functions to open and close the inlet pipeline 9 and the outlet pipeline 10.

[0030] A flow regulating valve 18 and a gas flowmeter are arranged on the gas delivery branch pipe 17. The gas delivery branch pipe 17 is communicated with an exhaust pipeline 19. An exhaust valve I 20 is arranged on the exhaust pipeline 19. In this embodiment, the flow regulating valve 18 can regulate the flow rate of the inert gas introduced into the furnace kiln 16, and the gas flowmeter can monitor the flow rate of the inert gas introduced into the furnace kiln 16. Before introducing the inert gas into the furnace kiln 16, the flow regulating valve 18 is closed and the exhaust valve I 20 is opened to discharge the inert gas waste gas with a lower temperature and not meeting the production requirements of electronic aluminum foil through the exhaust pipeline 19.

[0031] A plurality of air outlet branch pipes 23 are arranged at intervals on the air outlet pipeline 22, and a plurality of air outlet holes are evenly formed in the air outlet branch pipes 23. In this embodiment, the inert gas is preheated twice and then transported to the air outlet pipeline 22 through the gas transmission branch pipe 17. Then, the inert gas is transported to each air outlet branch pipe 23 through the air outlet pipeline 22 and discharged into the furnace 16 through the air outlet holes on the air outlet branch pipes 23.

[0032] The working principle of the present utility model is as follows: First, close the flow regulating valve 18, open the first evacuation valve 20 and the flow control valve 7. The liquefied inert gas in the storage tank 1 sequentially enters the vaporizer 12 through the liquid outlet pipeline 2, the liquid transportation pipeline 3 and the conversion pipeline 6. The vaporizer 12 performs a liquid-gas conversion operation on the liquefied inert gas. The liquefied inert gas exchanges heat with the circulating hot water under the action of the vaporizer 12. The liquefied inert gas is heated to form a gaseous inert gas, and the temperature of the circulating hot water decreases. Then, the inert gas is transported to the main pipeline 14 through the gas pipeline 13. The gas thermometer monitors the temperature of the inert gas discharged from the vaporizer 12. The gas dryer 15 on the main pipeline 14 dries the inert gas. Then, the inert gas enters the gas transmission branch pipe 17 and is discharged through the evacuation pipeline 19. The evacuation pipeline 19 discharges the inert gas with a lower temperature and the air in the pipeline.

[0033] Then, close the first evacuation valve 20 and open the flow regulating valve 18. The inert gas continues to be transported forward in the gas transmission branch pipe 17. During the transportation of the inert gas in the gas transmission branch pipe 17 located in the wall of the furnace 16, the temperature of the furnace heating belt 21 and the wall of the furnace 16 secondary-heats the inert gas. The temperature of the inert gas is heated to be maintained within ±10 degrees Celsius of the annealing temperature in the furnace 16. Then, the inert gas enters the air outlet pipeline 22 and is discharged into the furnace 16 through the air outlet holes of the air outlet branch pipes 23 on the air outlet pipeline 22.

[0034] In winter, close the flow control valve 7. The liquefied inert gas in the storage tank 1 is directly transported to the main pipeline 14 through the liquid outlet pipeline 2, the liquid transportation pipeline 3 and the transportation pipeline 4, and then directly transported to the gas transmission branch pipe 17 by the main pipeline 14. During the transportation of the liquefied inert gas in the gas transmission branch pipe 17 located in the wall of the furnace 16, the temperature of the furnace heating belt 21 and the wall of the furnace 16 heats the liquefied inert gas, causing the liquefied inert gas to be heated and form a gaseous inert gas. Then, the inert gas enters the air outlet pipeline 22 and is discharged into the furnace 16 through the air outlet holes of the air outlet branch pipes 23 on the air outlet pipeline 22.

[0035] The above embodiments are only the preferred embodiments of the utility model and do not limit the scope of implementation of the present utility model. Therefore, any equivalent changes or modifications made to the technical solutions described within the scope of the utility model patent should be included within the scope of the patent application of the present utility model.

Claims

1. An inert gas preheating system for vacuum annealing of electronic aluminum foil, comprising a storage tank (1), characterized in that, It further includes a main pipeline (14). An outlet liquid pipeline (2) is connected to the storage tank (1). The outlet liquid pipeline (2) is connected to an exhaust assembly and an infusion pipeline (3). The infusion pipeline (3) is connected to a liquid-gas conversion assembly and a delivery pipeline (4). A check valve (5) is provided on the delivery pipeline (4). The main pipeline (14) is connected to the liquid-gas conversion assembly and the delivery pipeline (4). A gas dryer (15) is provided on the main pipeline (14). A plurality of furnace heating assemblies are arranged at intervals on the main pipeline (14). The furnace heating assembly includes a furnace (16), an air delivery branch pipe (17), and a furnace heating belt (21). The furnace heating belt (21) is arranged around the inner part of the furnace wall of the furnace (16). One end of the air delivery branch pipe (17) is connected to the main pipeline (14), and the other end of the air delivery branch pipe (17) is arranged around the inner part of the furnace wall of the furnace (16) and extends into the interior of the furnace (16). The air delivery branch pipe (17) is connected to an outlet gas pipeline (22) located inside the furnace (16).

2. An inert gas preheating system for vacuum annealing of electronic aluminum foil according to claim 1, characterized in that, The exhaust assembly includes an exhaust pipeline (24) connected to the outlet liquid pipeline (2). A second drain valve (25) is provided on the exhaust pipeline (24).

3. An inert gas preheating system for vacuum annealing of electronic aluminum foil according to claim 1, characterized in that, The liquid-gas conversion assembly includes a circulating water tank (8) and a vaporizer (12) arranged inside the circulating water tank (8). The input end of the vaporizer (12) is connected to a conversion pipeline (6). One end of the conversion pipeline (6) extends outside the circulating water tank (8) and is connected to the infusion pipeline (3). A flow control valve (7) is provided on the conversion pipeline (6).

4. An inert gas preheating system for vacuum annealing of electronic aluminum foil according to claim 3, characterized in that, The output end of the vaporizer (12) is connected to a gas pipeline (13). The gas pipeline (13) is connected to the main pipeline (14). A gas thermometer is provided on the gas pipeline (13).

5. An inert gas preheating system for vacuum annealing of electronic aluminum foil according to claim 4, characterized in that, An inlet water pipeline (9) and an outlet water pipeline (10) are connected to the circulating water tank (8). Control valves (11) are provided on both the inlet water pipeline (9) and the outlet water pipeline (10).

6. An inert gas preheating system for vacuum annealing of electronic aluminum foil according to claim 1, characterized in that, A flow regulating valve (18) and a gas flowmeter are provided on the air delivery branch pipe (17). The air delivery branch pipe (17) is connected to a drain pipeline (19). A first drain valve (20) is provided on the drain pipeline (19).

7. An inert gas preheating system for vacuum annealing of electronic aluminum foil according to claim 6, characterized in that, A plurality of outlet gas branch pipes (23) are arranged at intervals on the outlet gas pipeline (22). A plurality of gas outlet holes are evenly formed on the outlet gas branch pipes (23).

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