A vacuum displacement chamber for brazing and a vacuum batch furnace system

Abstract

The utility model provides a kind of vacuum displacement chamber for brazing and vacuum batch furnace system, it is related to brazing equipment field, and vacuum displacement chamber is the cavity structure with jacket, including internal chamber, jacket layer and vacuum pumping mechanism, by vacuum pumping mechanism, air in internal chamber is extracted first, nitrogen is injected again, effectively solve the mode that traditional continuous furnace needs to continue nitrogen replacement, which directly brings the significant reduction of nitrogen consumption and the significant improvement of gas establishment speed;Vacuum displacement chamber is isolated from internal chamber by setting jacket layer and heat exchange, can realize product after convection type brazing furnace brazing, return to vacuum displacement chamber, maintain low oxygen atmosphere environment, indirectly cool down product to required process temperature by flowing cold wind in jacket, prevent product high-temperature oxidation;And vacuum batch furnace system includes drying furnace, vacuum displacement chamber, convection type brazing furnace and final cooling chamber, it is convenient to independently adjust the process parameters of each module according to different products, efficient and flexible.

Description

Technical Field

[0001] This utility model relates to the field of brazing equipment, and in particular to a vacuum replacement chamber and vacuum batch furnace system for brazing. Background Technology

[0002] Currently, the production of brazed components such as heat exchangers mainly relies on continuous brazing furnaces. However, continuous brazing furnaces have many drawbacks: the production line is large-scale, energy-intensive, requires a large area, and has high operating and maintenance costs. In addition, they have a narrow range of products, poor versatility, and insufficient production flexibility.

[0003] 1. Current continuous brazing furnace production lines typically include a drying furnace, a front air curtain chamber, a preheating furnace, a brazing furnace, a jacketed cooling furnace, a rear air curtain chamber, and a final cooling chamber, with an overall length of approximately 60 to 100 meters. This not only results in high costs but also requires a huge floor space.

[0004] 2. The atmosphere is formed from the front air curtain chamber to the rear air curtain chamber, maintaining a low-oxygen environment inside. Its working principle involves continuously replacing the internal air with 99.999% nitrogen, ultimately reducing the oxygen content to below 50 ppm or even lower. This process not only consumes a large amount of nitrogen but also takes a significant amount of time.

[0005] 3. The entire equipment relies on a stainless steel mesh belt to transport products. Due to the length and weight of the mesh belt, problems such as belt deviation and creeping are prone to occur. Furthermore, the heavy mesh belt absorbs a large amount of heat as it passes through various process sections, resulting in energy waste. In addition, continuous conveying inevitably leads to wear and tear on the mesh belt, making replacement a significant expense later on.

[0006] 4. Continuous brazing furnaces are usually designed according to the target product, with a width ranging from 800mm to 2300mm. Therefore, the equipment has poor versatility and cannot be compatible with products of other sizes.

[0007] 5. When dealing with different products, continuous brazing furnaces need to change processes, which requires idle adjustment during the process. This not only reduces production efficiency but also increases energy waste.

[0008] Therefore, how to solve the above problems has become an urgent issue for those skilled in the art. Utility Model Content

[0009] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a vacuum replacement chamber and vacuum batch furnace system for brazing. This patent first extracts the air from the internal chamber through a vacuuming mechanism and then injects nitrogen, effectively solving the problem of the need for continuous nitrogen replacement in traditional continuous furnaces. This directly leads to a significant reduction in nitrogen consumption and a significant improvement in atmosphere establishment speed. The vacuum replacement chamber of this patent has a jacket layer that is isolated from the internal chamber and exchanges heat with it. After the product is brazed in the convection brazing furnace, it can return to the vacuum replacement chamber to maintain a low-oxygen atmosphere. The cold air flowing in the jacket indirectly cools the product to the required process temperature and prevents the product from high-temperature oxidation.

[0010] This utility model is achieved through the following technical solution: A vacuum replacement chamber for brazing is a jacketed cavity structure. The inlet and outlet of the vacuum replacement chamber are connected to a drying furnace and a convection brazing furnace, respectively. The vacuum replacement chamber includes an internal chamber, a jacket layer, and a vacuum pumping mechanism. The internal chamber is equipped with a conveying unit for conveying brazing products. The jacket layer is located outside the internal chamber and is isolated from and heat-exchanges with the internal chamber. The brazing products in the internal chamber are indirectly cooled by cold air within the jacket layer. The vacuum pumping mechanism is used to extract air from the internal chamber. The internal chamber is equipped with a nitrogen injection port.

[0011] As can be seen, in the above technical solution, the air in the internal chamber is first extracted by the vacuuming mechanism and then nitrogen is injected, which effectively solves the problem of the need for continuous nitrogen replacement in traditional continuous furnaces. This directly leads to a significant reduction in nitrogen consumption and a significant improvement in atmosphere establishment speed. The vacuum replacement chamber, by setting a jacket layer that is isolated from the internal chamber and exchanges heat, can allow the product to return to the vacuum replacement chamber after brazing in the convection brazing furnace, maintaining a low-oxygen atmosphere. The cold air flowing in the jacket indirectly cools the product to the required process temperature, preventing high-temperature oxidation of the product.

[0012] According to the above technical solution, preferably, the inlet and outlet of the jacket layer are respectively provided with an air intake fan and an exhaust fan.

[0013] As can be seen, the above technical solution achieves forced and controllable circulation of cooling airflow within the jacket layer by setting independent intake and exhaust fans, effectively improving the uniformity and efficiency of the cooling effect.

[0014] According to the above technical solution, preferably, the cold air in the jacket layer flows along the U-shaped cross-section to surround the internal cavity.

[0015] As can be seen, in the above technical solution, the U-shaped flow path increases the effective contact area between the cold air and the internal cavity, achieving more uniform and sufficient enveloping cooling of the internal cavity.

[0016] According to the above technical solution, preferably, along the gas flow direction, the vacuum pumping mechanism includes a condenser, a vacuum butterfly valve, a filter, a Roots pump, and a screw pump connected in series.

[0017] According to the above technical solution, preferably, the outer side of the vacuum replacement chamber is provided with a vacuum sensor assembly, a pressure relief valve and a mechanical safety valve that are connected to the internal cavity.

[0018] As can be seen, in the above technical solution, the vacuum sensor assembly, pressure relief valve, and mechanical safety valve are used to ensure the safety and controllability of the vacuum replacement chamber operation, and the vacuum sensor assembly is used to accurately monitor the vacuum level; the pressure relief valve and mechanical safety valve provide dual overpressure protection to prevent equipment damage and safety accidents.

[0019] This utility model also provides a vacuum batch furnace system, which, according to the production process, sequentially includes a drying furnace, the aforementioned vacuum replacement chamber, a convection brazing furnace, and a final cooling chamber, wherein... The drying oven performs heating, drying, dehydration, and adhesive removal treatments on brazed products in an atmospheric environment. The vacuum replacement chamber meets the atmospheric environment requirements by evacuating the vacuum chamber and then backfilling it with nitrogen. The convection brazing furnace completes the brazing process by heating in a low-oxygen environment; The final cooling chamber is used to cool the brazed product to room temperature.

[0020] As can be seen, in the above technical solution, the vacuum batch furnace system includes a drying furnace, a vacuum replacement chamber, a convection brazing furnace, and a final cooling chamber. These four main functional modules are connected in series according to the process flow. This modular layout greatly improves production flexibility and allows production units to independently adjust the process parameters of each module according to different products, achieving efficient adjustment. Batch transfer avoids the long idle adjustment time required by traditional continuous furnaces due to product changes, effectively shortening non-production time and improving overall efficiency.

[0021] According to the above technical solution, preferably, it also includes a transfer mechanism, which is used to connect the drying furnace, the vacuum displacement chamber and the final cooling chamber. The vacuum displacement chamber and the final cooling chamber are arranged on the left and right sides of the transfer mechanism. The drying furnace is arranged at the feeding end of the transfer mechanism, and the vacuum displacement chamber and the final cooling chamber are arranged at the discharging end of the transfer mechanism.

[0022] According to the above technical solution, preferably, the transfer mechanism includes a traveling track and a transfer vehicle, the transfer vehicle moves on the traveling track, and the transfer vehicle is used to transfer brazed products between the drying oven, the vacuum replacement chamber and the final cooling chamber.

[0023] As can be seen, the above technical solution, by connecting the various modules through a transfer mechanism, can greatly reduce the footprint and improve space utilization.

[0024] According to the above technical solution, preferably, a furnace door chamber is provided between the vacuum replacement chamber and the convection brazing furnace, and a balance valve is provided between the furnace door chamber and the vacuum replacement chamber.

[0025] As can be seen, in the above technical solution, setting a furnace door chamber and a balancing valve between the vacuum replacement chamber and the convection brazing furnace can balance the gas pressure before the two doors are opened, preventing the doors from being unable to open due to excessive pressure difference.

[0026] The beneficial effects of this utility model are: (1) This patent uses a vacuuming mechanism to first extract the air from the internal chamber and then inject nitrogen, which effectively solves the problem of the traditional continuous furnace requiring continuous nitrogen replacement. This directly leads to a significant reduction in nitrogen consumption and a significant increase in atmosphere building speed. (2) By setting up a jacket layer that is isolated from the internal chamber and exchanges heat, the vacuum replacement chamber of this patent can realize that after the product is brazed in the convection brazing furnace, it can return to the vacuum replacement chamber to maintain a low oxygen atmosphere. The cold air flowing in the jacket can indirectly cool the product to the required process temperature and prevent the product from oxidizing at high temperature. (3) The vacuum batch furnace system of this patent includes a drying furnace, a vacuum replacement chamber, a convection brazing furnace and a final cooling chamber. The four main functional modules are connected in series according to the process flow. This modular layout greatly improves production flexibility and makes it easy for production units to independently adjust the process parameters of each module according to different products, so as to achieve efficient adjustment. (4) Batch transfer avoids the long idle adjustment time required by traditional continuous furnaces due to product changes, effectively shortening non-production time and improving overall efficiency. Attached Figure Description

[0027] Figure 1 A front view structural schematic diagram according to Embodiment 1 of the present invention is shown; Figure 2 A side view of Embodiment 1 according to the present invention is shown; Figure 3 A cross-sectional view of the internal chamber and jacket layer according to Embodiment 1 of the present invention is shown; Figure 4 Another cross-sectional view of the internal chamber and jacket layer according to Embodiment 1 of the present invention is shown; Figure 5 A top view of Embodiment 2 of the present invention is shown; Figure 6 A side view of Embodiment 2 according to the present invention is shown; Explanation of reference numerals in the attached figures: 1. Drying oven; 2. Convection brazing furnace; 3. Internal chamber; 4. Jacket layer; 5. Vacuum pumping mechanism; 6. Conveying unit; 7. Inlet fan; 8. Exhaust fan; 9. Condenser; 10. Vacuum butterfly valve; 11. Filter; 12. Roots pump; 13. Screw pump; 14. Vacuum sensor assembly; 15. Pressure relief valve; 16. Mechanical safety valve; 17. Final cooling chamber; 18. Transfer mechanism; 19. Traveling track; 20. Transfer car; 21. Furnace door chamber; 22. Balancing valve; 23. Vacuum replacement chamber. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and preferred embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0030] Example 1 As shown in the figure, this embodiment provides a vacuum replacement chamber for brazing, which is a jacketed cavity structure. The inlet and outlet of the vacuum replacement chamber 23 are connected to the drying furnace 1 and the convection brazing furnace 2, respectively. The vacuum replacement chamber 23 includes an internal chamber 3, a jacket layer 4, and a vacuum pumping mechanism 5. The internal chamber 3 is equipped with a conveying unit 6 for conveying brazing products. The jacket layer 4 is located on the outside of the internal chamber 3, isolating and exchanging heat with the internal chamber 3. The brazing products in the internal chamber 3 are indirectly cooled by cold air in the jacket layer 4. The vacuum pumping mechanism 5 is used to extract air from the internal chamber 3. The internal chamber 3 is equipped with a nitrogen injection port. The air in the internal chamber 3 is first extracted by the vacuum pumping mechanism 5, and then nitrogen is injected. This effectively solves the problem of the traditional continuous furnace requiring continuous nitrogen replacement, which directly leads to a significant reduction in nitrogen consumption and a significant improvement in atmosphere establishment speed. The vacuum replacement chamber 23 is equipped with a jacket layer 4 that is isolated from the internal chamber 3 and exchanges heat. After the product is brazed in the convection brazing furnace, it can return to the vacuum replacement chamber to maintain a low-oxygen atmosphere. The cold air flowing in the jacket indirectly cools the product to the required process temperature and prevents the product from oxidizing at high temperature.

[0031] Optionally, in one possible implementation, the inlet and outlet of the jacket layer 4 are respectively provided with an intake fan 7 and an exhaust fan 8. By setting independent intake fans 7 and exhaust fans 8, forced and controllable circulation of cooling airflow within the jacket layer 4 is achieved, effectively improving the uniformity and efficiency of the cooling effect.

[0032] Optionally, in one possible implementation, the cold air in the jacket layer 4 flows around the inner cavity 3 along the U-shaped cross section. The U-shaped flow path increases the effective contact area between the cold air and the inner cavity 3, achieving more uniform and sufficient enveloping cooling of the inner cavity 3.

[0033] Optionally, in one possible implementation, the vacuum pumping mechanism 5 includes a condenser 9, a vacuum butterfly valve 10, a filter 11, a Roots pump 12, and a screw pump 13 along the gas flow direction.

[0034] Optionally, in one possible implementation, the vacuum replacement chamber is provided with a vacuum sensor assembly 14, a pressure relief valve 15, and a mechanical safety valve 16 connected to the internal chamber 3 on the outside. The vacuum sensor assembly 14, the pressure relief valve 15, and the mechanical safety valve 16 are used to ensure the safety and controllability of the vacuum replacement chamber operation. The vacuum sensor assembly 14 is used to accurately monitor the vacuum level. The pressure relief valve 15 and the mechanical safety valve 16 provide dual overpressure protection to prevent equipment damage and safety accidents.

[0035] Example 2 This embodiment provides a vacuum batch furnace system, which, according to the production process, sequentially includes a drying furnace 1, a vacuum replacement chamber as described in Embodiment 1 above, a convection brazing furnace 2, and a final cooling chamber 17, wherein... Drying oven 1 performs heating, drying, dehydration, and adhesive removal treatments on brazed products in an atmospheric environment; The vacuum replacement chamber meets the atmospheric environment requirements by evacuating the vacuum chamber and then backfilling it with nitrogen. The convection brazing furnace 2 completes the brazing process by heating in a low-oxygen environment; After the product is brazed in the convection brazing furnace, it returns to the vacuum replacement chamber. Since the vacuum replacement chamber is equipped with a jacket layer 4 that is isolated from the internal chamber and exchanges heat, the internal chamber 3 can maintain a low oxygen atmosphere at this time. The inlet fan 7 and the exhaust fan 8 drive the gas flow in the jacket layer 4 to complete the heat exchange, so that the product is cooled down to the required process temperature and prevents the product from oxidizing at high temperature. The final cooling chamber 17 is used to cool the brazed product to room temperature.

[0036] As can be seen, in the above technical solution, the vacuum batch furnace system consists of four main functional modules connected in series according to the process flow: drying furnace 1, vacuum replacement chamber, convection brazing furnace 2, and final cooling chamber 17. This modular layout greatly improves production flexibility, making it easy for production units to independently adjust the process parameters of each module according to different products, thus achieving efficient adjustment. Batch transfer avoids the long idle adjustment time required by traditional continuous furnaces due to product changes, effectively shortening non-production time and improving overall efficiency.

[0037] Optionally, in one possible implementation, a transfer mechanism 18 is further included. The transfer mechanism 18 is used to connect the drying oven 1, the vacuum displacement chamber, and the final cooling chamber 17. The vacuum displacement chamber and the final cooling chamber 17 are arranged on the left and right sides of the transfer mechanism 18. The drying oven 1 is arranged at the feeding end of the transfer mechanism 18, and the vacuum displacement chamber and the final cooling chamber 17 are arranged at the discharging end of the transfer mechanism 18. The transfer mechanism 18 includes a traveling track 19 and a transfer vehicle 20. The transfer vehicle 20 moves on the traveling track and is used to transfer brazed products between the drying oven 1, the vacuum replacement chamber 23 and the final cooling chamber 17. By connecting the various modules through the transfer mechanism 18, the footprint can be greatly reduced and the space utilization rate can be improved.

[0038] As can be seen, in the above technical solution, a furnace door chamber 21 is provided between the vacuum replacement chamber and the convection brazing furnace 2, and a balancing valve 22 is provided between the furnace door chamber 21 and the vacuum replacement chamber. By setting the furnace door chamber 21 and the balancing valve 22 between the vacuum replacement chamber and the convection brazing furnace 2, the gas pressure can be balanced before the two doors are opened, preventing the doors from being unable to be opened due to excessive pressure difference.

[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A vacuum displacement chamber for brazing, characterized in that, It is a jacketed cavity structure. The inlet and outlet of the vacuum replacement chamber are connected to the drying furnace and the convection brazing furnace, respectively. The vacuum replacement chamber includes an internal chamber, a jacket layer, and a vacuum pumping mechanism. The internal chamber is equipped with a conveying unit for conveying brazing products. The jacket layer is located on the outside of the internal chamber. The jacket layer is isolated from the internal chamber and exchanges heat with it. The brazing products in the internal chamber are indirectly cooled by cold air in the jacket layer. The vacuum pumping mechanism is used to extract air from the internal chamber. The internal chamber is equipped with a nitrogen injection port.

2. The vacuum displacement chamber for brazing according to claim 1, characterized in that, The jacket layer is equipped with an air intake fan and an exhaust fan at its inlet and outlet, respectively.

3. The vacuum displacement chamber for brazing according to claim 2, characterized in that, The cold air inside the jacket layer flows along the U-shaped cross-section, enveloping the internal cavity.

4. The vacuum displacement chamber for brazing according to claim 1, characterized in that, Along the gas flow direction, the vacuum pumping mechanism includes a condenser, a vacuum butterfly valve, a filter, a Roots pump, and a screw pump connected in series.

5. A vacuum displacement chamber for brazing according to claim 1, characterized in that, The vacuum replacement chamber is equipped with a vacuum sensor assembly, a pressure relief valve, and a mechanical safety valve on the outside, which are connected to the internal chamber.

6. A vacuum batch furnace system, characterized in that, According to the production process, it sequentially includes a drying oven, a vacuum replacement chamber as described in any one of claims 1-5, a convection brazing furnace, and a final cooling chamber, wherein... The drying oven performs heating, drying, dehydration, and adhesive removal treatments on brazed products in an atmospheric environment. The vacuum replacement chamber meets the atmospheric environment requirements by evacuating the vacuum chamber and then backfilling it with nitrogen. The convection brazing furnace completes the brazing process by heating in a low-oxygen environment; The final cooling chamber is used to cool the brazed product to room temperature.

7. A vacuum batch furnace system according to claim 6, characterized in that, It also includes a transfer mechanism, which is used to connect the drying furnace, the vacuum displacement chamber and the final cooling chamber. The vacuum displacement chamber and the final cooling chamber are arranged on the left and right sides of the transfer mechanism. The drying furnace is arranged at the feed end of the transfer mechanism, and the vacuum displacement chamber and the final cooling chamber are arranged at the discharge end of the transfer mechanism.

8. A vacuum batch furnace system according to claim 7, characterized in that, The transfer mechanism includes a traveling track and a transfer vehicle. The transfer vehicle moves on the traveling track and is used to transfer brazed products between the drying oven, the vacuum displacement chamber, and the final cooling chamber.

9. A vacuum batch furnace system according to claim 8, characterized in that, A furnace door chamber is provided between the vacuum replacement chamber and the convection brazing furnace, and a balancing valve is provided between the furnace door chamber and the vacuum replacement chamber.

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