A multi-stage heat insulation transmission system of a heat exchanger brazing device

Abstract

This application relates to a multi-stage heat-insulating transmission system for a heat exchanger brazing apparatus, specifically in the technical field of continuous brazing production lines for heat exchangers. The system comprises a degreasing furnace, insulation module I, a brazing furnace, insulation module II, insulation module III, and an air-cooling zone arranged sequentially along the workpiece transport direction. Through the multi-stage structural design of the degreasing furnace, insulation module I, brazing furnace, insulation module II, insulation module III, and air-cooling zone, gradient isolation can be achieved. By blocking heat diffusion through each module, mutual interference between the low-temperature degreasing zone and the high-temperature brazing zone can be avoided. The arrangement of insulation modules I, II, and III forms a three-stage heat insulation system. Each module includes a casing and multiple layers of high-temperature resistant flexible thermal insulation, enabling precise thermal zoning management. The design of the reflective layer, air insulation interlayer, and dense curtain within insulation module II provides triple protection, effectively mitigating the thermal shock at the 800°C brazing furnace outlet.

Description

Technical Field

[0001] This application relates to a continuous brazing production line for heat exchangers, and more particularly to a multi-stage heat transfer system for a heat exchanger brazing apparatus. Background Technology

[0002] In the process of heat exchanger brazing, the workpiece usually needs to go through multiple continuous processes such as degreasing, brazing, and cooling. At present, the industry generally adopts a linear continuous furnace design, with each functional furnace connected by an open conveyor belt. This layout leads to significant heat exchange between the furnaces, especially the heat from the high-temperature brazing furnace will be lost to the low-temperature area in large quantities. According to statistics, about 35% of the heat energy of the brazing furnace in the traditional design is lost through the workpiece transmission channel, which not only causes energy waste, but also causes the temperature of the degreasing furnace to rise, seriously affecting the degreasing effect. In addition, due to the lack of effective heat insulation measures between the furnaces, the ambient temperature around the production line rises significantly, causing discomfort to the operators and increasing the energy consumption of the workshop's air conditioning.

[0003] In practical applications, isolation methods cannot simultaneously ensure temperature control accuracy and transmission efficiency. Simple insulation structures can only provide basic insulation and cannot effectively block high-temperature radiation above 800℃. To solve the above problems, a multi-stage insulation transmission system for a heat exchanger brazing device is proposed. Utility Model Content

[0004] The purpose of this application is to provide a multi-stage heat insulation transmission system for a heat exchanger brazing device, which has the advantages of multiple sets of heat insulation structures. It solves the problems that isolation methods cannot simultaneously ensure temperature control accuracy and transmission efficiency, and that simple heat insulation structures cannot effectively block high-temperature radiation above 800℃.

[0005] The multi-stage heat-insulated transmission system of the heat exchanger brazing device provided in this application adopts the following technical solution: it includes a degreasing furnace, heat insulation module I, brazing furnace, heat insulation module II, heat insulation module III and air-cooling zone arranged sequentially along the workpiece transmission direction. The input end of heat insulation module I is sealed to the outlet of the degreasing furnace. The outlet end of the brazing furnace is provided with a high-temperature radiation monitoring point. The input end of heat insulation module II is rigidly connected to the outlet flange of the brazing furnace. The output end of heat insulation module III extends to the inlet of the air-cooling zone. The air-cooling zone is equipped with a forced convection fan.

[0006] The heat insulation module I, heat insulation module II and heat insulation module III each contain a cover. The cover is a U-shaped cavity with an open bottom, which is fixed upside down above the workpiece conveying structure. The side wall of the cover has a workpiece channel opening. The inner wall of the cover is covered with a ceramic fiber sealing gasket. A multi-layer heat insulation curtain group is vertically suspended at the top inside the cover. The heat insulation curtain group is made of ceramic fiber cloth.

[0007] By adopting the above technical solution, and through the multi-level structural design of the degreasing furnace, insulation module I, brazing furnace, insulation module II, insulation module III, and air-cooling zone, gradient isolation can be achieved. By blocking heat diffusion in each module, mutual interference between the low-temperature degreasing zone and the high-temperature brazing zone can be avoided, ensuring process stability. The U-shaped design of the casing and its open bottom allow the workpiece conveying structure to run through while forming a semi-enclosed thermal barrier. The inclusion of insulation modules I, II, and III creates a three-level insulation system. Each module includes a casing and multiple layers of high-temperature resistant flexible thermal insulation, enabling precise thermal zoning management. Multiple curtains divide the airflow, forming a stepped temperature buffer zone to reduce heat conduction and convection losses. The gap between the cover and the edge of the workpiece conveyor structure is 5-10mm. The design of the 5-10mm gap and the ceramic fiber sealing gasket can dynamically compensate for thermal expansion deformation and reduce the loss of hot air. The gap between the bottom of the heat insulation curtain group and the surface of the conveyor belt is 10-15mm. This design not only blocks heat flow but also prevents scratching of the workpiece. The degreasing furnace operates at a temperature range of 45-55℃, and the brazing furnace temperature is ≥800℃.

[0008] Preferably, the thermal insulation curtain group in the thermal insulation module I has three layers, the layer spacing is 70-80mm, the curtain thickness is 3mm, and the cover length is 1000mm; the thermal insulation curtain group in the thermal insulation module III has four layers, the layer spacing is 60-70mm, the curtain thickness is 4mm, and the cover length is 1200mm.

[0009] By adopting the above technical solution, the heat insulation module I can block heat backflow below 300℃, adapt to the medium and low temperature transition zone, and balance heat insulation and cost. By setting the heat insulation module III, gradient buffer cooling can be performed, sudden cooling stress can be eliminated, temperature buffer can be provided for the air-cooled zone, and cold air can be prevented from directly impacting high-temperature workpieces.

[0010] Preferably, the thermal insulation curtain group in the thermal insulation module II has six layers, the layer spacing is ≤50mm, the curtain thickness is 5mm, and the cover length is 1500mm;

[0011] By adopting the above technical solutions, by setting up heat insulation module II, the heat insulation efficiency of the high-temperature area is enhanced by the close spacing of the layers. By setting up a six-layer heat-breaking curtain group, the radiant heat absorption rate can be improved. By designing a 50mm spacing, the wavelength of heat flow at 800℃ can be blocked.

[0012] Preferably, the temperature between the curtain layers inside the heat insulation module II decreases layer by layer;

[0013] By adopting the above technical solution, a heat decay curve can be formed by the gradual decrease of temperature between the curtain layers. This ensures that high-temperature heat is dissipated step by step, avoiding the impact of heat from the brazing furnace outlet on subsequent modules. The temperature gradient between the curtain layers is ≥100℃ for each layer.

[0014] Preferably, the inner wall of the housing within the heat insulation module II is composite with a reflective layer;

[0015] By adopting the above technical solution and setting a reflective layer, the problem of high-temperature oxidation failure of aluminum foil in ceramic substrate can be solved. The reflective layer is made of 99.5% pure aluminum foil and ceramic fiber felt.

[0016] Preferably, an air insulation interlayer is provided between the reflective layer and the heat-insulating curtain assembly;

[0017] By adopting the above technical solution, and by setting an air insulation interlayer, the air insulation interlayer and the reflective layer can be used together to comprehensively improve the heat insulation performance. The distance between the reflective layer and the heat insulation curtain assembly is 20mm.

[0018] Preferably, a temperature sensor is installed at the inlet of the air-cooled zone;

[0019] By adopting the above technical solution and setting a temperature sensor, the temperature of the workpiece entering the air-cooled zone can be fed back in real time. The distance between the temperature sensor and the heat insulation module III is 200-300mm. The 200-300mm distance can ensure that the temperature sampling is completed before the workpiece enters the air-cooled zone, avoiding the interference of the heat radiation of the cover on the temperature sensor.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] This multi-stage heat-insulated transmission system for a heat exchanger brazing device, through its multi-stage structural design including a degreasing furnace, insulation module I, a brazing furnace, insulation module II, insulation module III, and an air-cooling zone, achieves gradient isolation. By blocking heat diffusion in each module, it avoids mutual interference between the low-temperature degreasing zone and the high-temperature brazing zone, ensuring process stability. The U-shaped design of the casing and its open bottom allow the workpiece conveying structure to run through while forming a semi-enclosed thermal barrier. The inclusion of insulation modules I, II, and III creates three levels of insulation. Each module includes a casing and multiple layers of high-temperature resistant flexible thermal insulation, enabling precise thermal zoning management. Multiple curtains divide the airflow, forming a stepped temperature buffer zone to reduce heat... The design of the reflective layer, air insulation interlayer, and dense curtain in the heat insulation module II provides triple protection against conduction and convection losses, effectively mitigating the thermal shock at the 800℃ brazing furnace outlet. The gap between the cover and the edge of the workpiece conveyor structure is 5-10mm. This 5-10mm gap, combined with the ceramic fiber sealing gasket, dynamically compensates for thermal expansion deformation, reducing heat loss. The gap between the bottom of the heat insulation curtain assembly and the conveyor belt surface is 10-15mm. This design effectively blocks heat flow and prevents scratching of the workpiece. The degreasing furnace operates at a temperature range of 45-55℃, and the brazing furnace temperature is ≥800℃. Attached Figure Description

[0022] Figure 1 This is a frontal three-dimensional structural diagram of this application;

[0023] Figure 2 This is a schematic diagram of the thermal insulation curtain assembly inside the thermal insulation module II in this application;

[0024] Figure 3 This is a structural schematic diagram of the cross-section of the inner shell of the thermal insulation module II in this application;

[0025] Figure 4 This is a structural block diagram of the workpiece operation process in this application;

[0026] Figure 5 This is a detailed structural diagram of the internal structure of the thermal insulation module in this application.

[0027] In the picture:

[0028] 1. Degreasing furnace;

[0029] 2. Thermal Insulation Module I;

[0030] 3. Brazing furnace;

[0031] 4. Thermal insulation module II;

[0032] 5. Thermal Insulation Module III;

[0033] 6. Air-cooled area;

[0034] 7. Cover; 701. Ceramic fiber sealing gasket; 702. Workpiece passage opening;

[0035] 8. Thermal insulation curtain assembly;

[0036] 9. Reflective layer; 901. Air insulation interlayer;

[0037] 10. Temperature sensor. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1 ~Attached Figure 5 This application will be described in further detail below.

[0039] Example 1: A multi-stage heat transfer system for a heat exchanger brazing device, referring to... Figure 1 , Figure 2 and Figure 3 The system includes a degreasing furnace 1, a heat insulation module I2, a brazing furnace 3, a heat insulation module II4, a heat insulation module III5, and an air-cooled zone 6 arranged sequentially along the workpiece conveying direction. The input end of the heat insulation module I2 is sealed to the outlet of the degreasing furnace 1. The outlet end of the brazing furnace 3 is equipped with a high-temperature radiation monitoring point. The input end of the heat insulation module II4 is rigidly connected to the outlet flange of the brazing furnace 3. The output end of the heat insulation module III5 extends to the inlet of the air-cooled zone 6. The air-cooled zone 6 is equipped with a forced convection fan.

[0040] Each of the insulation modules I2, II4, and III5 contains a housing 7, which is a U-shaped cavity with an open bottom. The housing 7 is inverted and fixed above the workpiece conveying structure. The side wall of the housing 7 has a workpiece passage opening 702, and the inner wall of the housing 7 is covered with a ceramic fiber sealing gasket 701. Multiple layers of heat-insulating curtains 8, made of ceramic fiber cloth, are vertically suspended from the top inside the housing 7. Through the multi-level structural design of the degreasing furnace 1, insulation module I2, brazing furnace 3, insulation module II4, insulation module III5, and air-cooling zone 6, gradient isolation can be achieved. By blocking heat diffusion through each module, mutual interference between the low-temperature degreasing zone and the high-temperature brazing zone can be avoided, ensuring process stability. The U-shaped design and open bottom of the housing 7 allow the workpiece conveying structure to run through while forming a semi-enclosed thermal barrier. The use of insulation modules I2, II4, and III5 forms a three-level insulation system. All components include a housing 7 and multiple layers of high-temperature resistant flexible thermal insulation, enabling precise thermal zoning management. Multiple curtains divide the airflow, forming a stepped temperature buffer zone to reduce heat conduction and convection losses. The design of the reflective layer 9 within the thermal insulation module II 4, the air insulation interlayer 901, and the dense curtains provides triple protection, effectively mitigating the thermal shock at the outlet of the 800℃ brazing furnace 3. The gap between the housing 7 and the edge of the workpiece conveying structure is 5–10 mm. This 5–10 mm gap, combined with the ceramic fiber sealing gasket 701, dynamically compensates for thermal expansion deformation, reducing heat loss. The gap between the bottom of the thermal insulation curtain group 8 and the surface of the conveyor belt is 10–15 mm. This 10–15 mm gap effectively blocks heat flow and prevents scratching of the workpiece. The degreasing furnace 1 operates at a temperature range of 45–55℃, and the brazing furnace 3 operates at a temperature ≥800℃.

[0041] Please see Figure 2 and Figure 3The thermal insulation module I2 has three layers of thermal break curtains (8 layers total), with a layer spacing of 70-80mm, a curtain thickness of 3mm, and a casing length of 1000mm. The thermal insulation module III5 has four layers of thermal break curtains (8 layers total), with a layer spacing of 60-70mm, a curtain thickness of 4mm, and a casing length of 1200mm. Thermal insulation module I2 can prevent heat backflow below 300℃, adapting to the medium-low temperature transition zone and balancing insulation and cost. Thermal insulation module III5 allows for gradient buffer cooling, eliminates sudden cooling stress, and supports air cooling. Zone 6 provides a temperature buffer to prevent cold air from directly impacting high-temperature workpieces. The thermal insulation curtain group 8 inside the thermal insulation module II4 has six layers with a layer spacing of ≤50mm, a curtain thickness of 5mm, and a cover length of 1500mm. By setting up the thermal insulation module II4, the tight layer spacing enhances the thermal insulation efficiency of the high-temperature zone. By setting up the six-layer thermal insulation curtain group 8, the radiative heat absorption rate can be improved. The 50mm spacing design can block the 800℃ heat flow wavelength (blackbody radiation theory shows that the peak wavelength of 800℃ is 2.9μm, and the layer spacing design is adapted to the wavelength attenuation model).

[0042] Please see Figure 2 and Figure 3 The temperature between the curtain layers in the heat insulation module II4 decreases layer by layer. This gradual temperature decrease between the curtain layers forms a heat decay curve, ensuring that high-temperature heat is dissipated step by step and preventing the heat from the brazing furnace 3 outlet from impacting subsequent modules. The temperature gradient between the curtain layers is ≥100℃ per layer. The inner wall of the cover 7 inside the heat insulation module II4 is composite with a reflective layer 9. By setting the reflective layer 9, the problem of high-temperature oxidation failure of aluminum foil in ceramic substrate can be solved. The reflective layer 9 is made of 99.5% pure aluminum foil and ceramic fiber felt.

[0043] Please see Figure 2 and Figure 3 An air insulation interlayer 901 is provided between the reflective layer 9 and the heat insulation curtain group 8. By providing the air insulation interlayer 901, the air insulation interlayer 901 and the reflective layer 9 can be used together to comprehensively improve the heat insulation performance. The distance between the reflective layer 9 and the heat insulation curtain group 8 is 20mm. A temperature sensor 10 is provided at the entrance of the air-cooled zone 6. By providing the temperature sensor 10, the temperature of the workpiece entering the air-cooled zone 6 can be fed back in real time. The distance between the temperature sensor 10 and the heat insulation module Ⅲ5 is 200-300mm. The 200-300mm distance can ensure that the temperature is sampled before the workpiece enters the air-cooled zone 6, avoiding the interference of the heat radiation of the cover 7 on the temperature sensor 10.

[0044] The implementation principle of this application embodiment is as follows: In use, step one: after the workpiece is treated by the degreasing furnace 1, it enters the heat insulation module I2 at a speed of 0.5m / s to prevent heat backflow. Step two: the workpiece enters the brazing furnace 3 from the heat insulation module I2 and is brazed at 820℃±10℃. Step three: after brazing, the workpiece enters the heat insulation module II4 at 0.4m / s, where the six layers of heat insulation curtains can form a temperature gradient and can provide dense heat insulation. Step four: the workpiece enters the heat insulation module III5 from the heat insulation module II4 and is naturally cooled to 200~250℃ in the heat insulation module III5. Step five: the workpiece enters the air-cooling zone 6 from the heat insulation module III5 and is forced to cool to room temperature.

[0045] During the transportation and cooling process, the design of the degreasing furnace 1, insulation module I2, brazing furnace 3, insulation module II4, insulation module III5, and air-cooled zone 6 can achieve gradient isolation. Each module blocks heat diffusion, avoiding mutual interference between the low-temperature degreasing zone and the high-temperature brazing zone, and ensuring process stability. Among them, the insulation modules I2, II4, and III5 can form a three-level insulation. Each module includes a cover 7 and multiple layers of high-temperature resistant flexible thermal insulation, which can accurately manage the thermal zones and reduce heat loss from the brazing furnace 3. The design of the reflective layer 9, the air insulation interlayer 901, and the dense curtain in the insulation module II4 can form triple protection, which can effectively mitigate the thermal shock at the outlet of the 800℃ brazing furnace 3.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-stage heat-insulated transmission system for a heat exchanger brazing apparatus, comprising a degreasing furnace (1), a heat insulation module I (2), a brazing furnace (3), a heat insulation module II (4), a heat insulation module III (5), and an air-cooled zone (6) arranged sequentially along the workpiece transmission direction, characterized in that: The input end of the heat insulation module I (2) is sealed to the outlet of the degreasing furnace (1), the outlet end of the brazing furnace (3) is equipped with a high temperature radiation monitoring point, the input end of the heat insulation module II (4) is rigidly connected to the outlet flange of the brazing furnace (3), the output end of the heat insulation module III (5) extends to the inlet of the air-cooled zone (6), and the air-cooled zone (6) is equipped with a forced convection fan; The heat insulation module I (2), heat insulation module II (4) and heat insulation module III (5) each contain a cover (7). The cover (7) is a U-shaped cavity with an open bottom, which is fixed upside down above the workpiece conveying structure. The side wall of the cover (7) is provided with a workpiece channel opening (702). The inner wall of the cover (7) is covered with a ceramic fiber sealing gasket (701). The top of the inside of the cover (7) is vertically suspended by a multi-layer heat insulation curtain group (8). The heat insulation curtain group (8) is made of ceramic fiber cloth.

2. A multi-stage heat isolation transfer system of a brazing apparatus for heat exchangers according to claim 1, characterized in that: The heat insulation module I (2) has three layers of heat-breaking curtain group (8), with a layer spacing of 70-80mm, a curtain thickness of 3mm, and a cover length of 1000mm. The heat insulation module III (5) has four layers of heat-breaking curtain group (8), with a layer spacing of 60-70mm, a curtain thickness of 4mm, and a cover length of 1200mm.

3. The multi-stage heat isolation and transfer system of a brazed heat exchanger apparatus of claim 1, wherein: The heat insulation module II (4) has six layers of heat-breaking curtain group (8), with a layer spacing of ≤50mm, a curtain thickness of 5mm, and a cover length of 1500mm.

4. The multi-stage heat isolation transfer system of a brazed heat exchanger apparatus of claim 1, wherein: The temperature between the inner curtain layers of the heat insulation module II (4) decreases layer by layer.

5. The multi-stage heat isolation and transfer system of a brazed heat exchanger apparatus of claim 1, wherein: The inner wall of the cover (7) inside the heat insulation module II (4) is composite with a reflective layer (9).

6. A multi-stage heat isolation transfer system of a brazing apparatus for heat exchangers according to claim 5, characterized in that: An air insulation interlayer (901) is provided between the reflective layer (9) and the heat insulation curtain group (8).

7. The multi-stage heat isolation transfer system of a brazed heat exchanger apparatus of claim 1, wherein: A temperature sensor (10) is installed at the entrance of the air-cooled zone (6).

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