Low energy consumption waste heat recovery type brazing furnace

Abstract

The application discloses a low-energy-consumption waste heat recovery type brazing furnace, which comprises a furnace bottom with a ring-shaped cross section, a muffle top with a U-shaped cross section, a plurality of air guide strips fixed to the inner top of the muffle top and distributed in a ring shape with the center of the furnace bottom as the center, an atmosphere nitrogen preheating chamber with a middle line tangent to the middle line of the furnace bottom, a nitrogen pipe communicated with the atmosphere nitrogen preheating chamber, an inlet and an outlet arranged on the side surface of the muffle top, the position of the inlet and the outlet being perpendicular to the atmosphere nitrogen preheating chamber and having an overlapping area with the inside of the atmosphere nitrogen preheating chamber, heating element groups respectively fully arranged on the inner wall of the muffle top and the top wall of the atmosphere nitrogen preheating chamber, water pipes with both ends arranged outside the muffle top and the pipe body arranged on the inner top of the muffle top, and a total controller connected with the heating element groups. The application has the advantages of lower energy consumption and recovery of excess heat.

Description

A low-energy waste heat recovery brazing furnace Technical Field

[0001] This invention relates to the technical field of brazing equipment, and in particular to a low-energy-consumption waste heat recovery brazing furnace. Background Technology

[0002] A brazing furnace is a device used for brazing and bright heat treatment of metals. It is suitable for mass production of small and medium-sized stainless steel parts (tableware, knives, hardware, etc.), such as bright quenching and tempering of martensitic stainless steel and bright annealing of austenitic stainless steel.

[0003] Existing brazing furnaces have a single function: brazing. A large amount of heat generated during the process is wasted. Moreover, because brazing furnaces have large internal spaces and large openings for easy metal loading and unloading, they have huge energy requirements.

[0004] A low-energy brazing furnace, disclosed in Chinese Patent Publication No. CN106624241A on May 10, 2017, includes a furnace body, a nitrogen delivery pipe (3), and a conveyor belt (4). The furnace body includes a preheating section (1) and a brazing section (2) arranged front and rear. A heating device is provided in the preheating section (1). The nitrogen delivery pipe (3) and the conveyor belt (5) are arranged along the furnace body. The invention is characterized in that the nitrogen delivery pipe (3) is a metal pipe, and a temperature acquisition and display device is connected to the part of the nitrogen delivery pipe (3) located between the preheating section (1) and the brazing section (2). Compared with the prior art, this invention, by setting a temperature acquisition and display device on the nitrogen delivery pipe between the preheating section and the brazing section, can observe the temperature of the preheated nitrogen, thereby adjusting the power of the heating device, which is beneficial to the temperature stability of subsequent processes and reduces the energy consumption of the heater in the brazing section. The shortcomings of this invention are that the energy consumption is not low enough and it cannot recover excess heat energy. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of existing technologies, such as insufficient energy consumption and inability to recover excess heat, and provides a low-energy-consumption waste heat recovery brazing furnace that has even lower energy consumption and can recover excess heat.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a low-energy-consumption waste heat recovery brazing furnace, comprising: a furnace bottom, the furnace bottom having an annular cross-sectional shape and placed on a plane; a muffle top, placed on the upper surface of the furnace bottom, the muffle top having a U-shaped cross-sectional shape, both ends of the U-shaped opening of the muffle top being fixedly connected to the upper surface of the furnace bottom and forming an internal space with the furnace bottom, the direction of the muffle top being consistent with the shape of the furnace bottom, and several air guide strips fixed to the inner top of the muffle top, the air guide strips being distributed in a ring outward from the center of the furnace bottom; and a nitrogen preheating chamber, placed on the side of the muffle top, the centerline of the nitrogen preheating chamber being tangent to the centerline of the furnace bottom shape, the interior of the nitrogen preheating chamber being connected to the internal space formed by the furnace bottom and the muffle top, the atmosphere... The nitrogen preheating chamber is fixedly connected to both the muffle top and the furnace bottom. A nitrogen pipe is connected to the nitrogen preheating chamber, and the gas flow direction of the nitrogen pipe is tangent to the centerline of the furnace bottom shape. The inlet and outlet are located on the side of the muffle top, with their centerlines tangent to the centerline of the furnace bottom shape. The positions of the inlet and outlet are perpendicular to the nitrogen preheating chamber and overlap with its interior. Heating element groups are laid throughout the walls of both the muffle top and the nitrogen preheating chamber, and are fixedly connected to both. A water pipe is positioned outside the muffle top at both ends, with the pipe body located at the top of the muffle top and connected to the inner top surface of the muffle top. A central controller is located outside the muffle top, and the heating element groups are connected to it for control.

[0007] In use, the heating element group is turned on with the main controller to heat the space between the muffle top and the furnace bottom. At the same time, nitrogen is introduced into the atmosphere nitrogen preheating chamber through the nitrogen pipe and then into the brazing furnace. Then, the metal to be processed is brought in through the inlet and outlet by a transport trolley and placed around the muffle top and the furnace bottom. After the process is completed, it can move in the same direction and exit through the inlet and outlet. Throughout the process, the hot air is contained at the top by the muffle top and is circulated and guided by the air guide strips. Cold water is injected into one end of the water pipe, and the excess heat energy is used to heat the water. Finally, the heated water is collected from the other end of the water pipe, achieving the purpose of lower energy consumption and recovery of excess heat energy.

[0008] Preferably, a base is laid on the bottom surface of the furnace bottom, the base is fixedly connected to the furnace bottom, and the base is made of heat-insulating and fireproof material.

[0009] Preferably, the outer surface of the muffle roof is covered with a heat insulation layer, which is fixedly connected to the muffle roof and is made of heat insulation material. Both the heat insulation layer and the base provide convenient heat insulation, preventing burns and saving energy.

[0010] Preferably, the muffle roof has several heat dissipation holes on its upper surface, which are staggered with the air guides. Baffles are installed inside the heat dissipation holes, and these baffles are connected to the main controller. The heat dissipation holes facilitate rapid cooling when the furnace temperature is too high.

[0011] Preferably, a telescopic cylinder is provided on the bottom surface of the baffle. One end of the telescopic cylinder is fixedly connected to the lower end face of the baffle, and the other end is fixedly connected to the step inside the heat dissipation hole. A controller is provided on the top of the muffle, which is electrically connected to the telescopic cylinder and also connected to a master controller. The telescopic cylinder, in conjunction with the controller and the master controller, allows for more detailed and accurate adjustment of the baffle.

[0012] Preferably, the lower end face of the inlet and outlet is provided with a ramp, the higher surface of which corresponds to the inlet and outlet and is fixedly connected to the furnace bottom. The ramp facilitates the entry of the transport trolley into the muffle roof, which has the height of the base.

[0013] Preferably, the inlet and outlet are covered with a lift door, the upper end of which is fixedly connected to the upper surface of the inlet and outlet. The lift door facilitates the enclosure of the space and reduces energy dissipation.

[0014] Preferably, the heating element group is divided into several zones, and the zones of the heating element group are controlled by a central controller. Zoned control of the heating element group allows for adjustment according to different working conditions, enabling precise energy savings and improved production efficiency.

[0015] Preferably, the water pipe is positioned within the top portion of the muffle roof and its shape aligns with that of the air guide strips. This arrangement of the water pipes and the orientation of the air guide strips facilitates the recovery of excess energy.

[0016] Preferably, the muffle roof is provided with several maintenance pipes, which are connected to the heating element assembly and are fixedly connected to the muffle roof. The maintenance pipes facilitate the maintenance of the heating element assembly.

[0017] The beneficial effects of this invention are: lower energy consumption and the ability to recover excess heat energy; both the insulation layer and the base facilitate heat insulation, preventing burns and saving energy; the heat dissipation holes facilitate rapid cooling when the furnace temperature is too high; the telescopic cylinder, in conjunction with the controller and the main controller, allows for more detailed and accurate adjustment of the baffles; the ramp facilitates the transport trolley entering the muffle roof with the base height; the lifting door facilitates the enclosure of the space, reducing energy dissipation; the heating element group can be zoned and adjusted according to different working areas, accurately saving energy and improving production efficiency; the layout of the water pipes and the direction of the air guides facilitate the recovery of excess energy; and the maintenance pipes facilitate the maintenance of the heating element group. Attached Figure Description

[0018] Figure 1 is a structural schematic diagram of the present invention; Figure 2 is a cross-sectional view of the front view of the present invention; Figure 3 is a cross-sectional view of AA in Figure 2; Figure 4 is a cross-sectional view of BB in Figure 3; Figure 5 is an enlarged view of detail C in Figure 4.

[0019] In the diagram: 1. Furnace bottom, 2. Muffle top, 3. Nitrogen preheating chamber, 4. Inlet / outlet, 5. Nitrogen pipe, 6. Heating element assembly, 7. Water pipe, 8. Air guide strip, 9. Base, 10. Insulation layer, 11. Heat dissipation hole, 12. Main controller, 13. Baffle, 14. Telescopic cylinder, 15. Controller, 16. Ramp, 17. Lifting door, 18. Maintenance pipe. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0021] As shown in Figures 1, 2, and 3, a low-energy-consumption waste heat recovery brazing furnace includes: a furnace bottom 1 with an annular cross-sectional shape placed on a plane; a muffle top 2 placed on the upper surface of the furnace bottom 1, the muffle top 2 having a U-shaped cross-sectional shape, both ends of the U-shaped opening of the muffle top 2 being fixedly connected to the upper surface of the furnace bottom 1 and forming an internal space with the furnace bottom 1, the orientation of the muffle top 2 being consistent with the shape of the furnace bottom 1, and several air guide strips 8 fixed on the inner top of the muffle top 2, the air guide strips 8 being distributed in a ring outward from the center of the furnace bottom 1; and a nitrogen preheating chamber 3 placed on the side of the muffle top 2, the centerline of the nitrogen preheating chamber 3 being tangent to the centerline of the shape of the furnace bottom 1, the interior of the nitrogen preheating chamber 3 being connected to the internal space formed by the furnace bottom 1 and the muffle top 2, and the nitrogen preheating chamber 3 being connected to the muffle top 1. The top 2 and the bottom 1 are fixedly connected. A nitrogen pipe 5 is connected to the nitrogen preheating chamber 3. The ventilation direction of the nitrogen pipe 5 is tangent to the center line of the shape of the bottom 1. The inlet and outlet 4 are located on the side of the muffle top 2. The center line of the inlet and outlet 4 is tangent to the center line of the shape of the bottom 1. The position of the inlet and outlet 4 is perpendicular to the nitrogen preheating chamber 3 and has an overlapping area with the interior of the nitrogen preheating chamber 3. The heating element group 6 is filled with the inner wall of the muffle top 2 and the top wall of the nitrogen preheating chamber 3. The heating element group 6 is fixedly connected to the muffle top 2 and the nitrogen preheating chamber 3. Both ends of the water pipe 7 are located outside the muffle top 2. The pipe body of the water pipe 7 is located inside the top of the muffle top 2 and is connected to the inner top surface of the muffle top 2. The main controller 12 is located outside the muffle top 2. The heating element group 6 is connected to the main controller 12 for control.

[0022] As shown in Figures 1, 2 and 4, a base 9 is laid on the bottom surface of the furnace bottom 1. The base 9 is fixedly connected to the furnace bottom 1 and is made of heat-insulating and fireproof material.

[0023] As shown in Figure 5, the outer surface of the muffle roof 2 is covered with a heat insulation layer 10, which is fixedly connected to the muffle roof 2. The heat insulation layer 10 is a heat insulation material.

[0024] As shown in Figures 1 and 5, the muffle top 2 has several heat dissipation holes 11 on its upper surface. The heat dissipation holes 11 are staggered with the air guide strips 8. A baffle 13 is installed inside the heat dissipation holes 11, and the baffle 13 is connected to the main controller 12 for control.

[0025] As shown in Figure 5, there is a telescopic cylinder 14 on the bottom surface of the baffle 13. One end of the telescopic cylinder 14 is fixedly connected to the lower end face of the baffle 13, and the other end of the telescopic cylinder 14 is fixedly connected to the step inside the heat dissipation hole 11. A controller 15 is provided on the muffle top 2. The controller 15 is electrically connected to the telescopic cylinder 14 and is controlled by the main controller 12.

[0026] As shown in Figure 1, there is a ramp 16 on the lower end face of the inlet and outlet 4. The high surface of the ramp 16 corresponds to the inlet and outlet 4 and is fixedly connected to the furnace bottom 1.

[0027] As shown in Figures 1 and 4, an elevator door 17 is covered on the inlet / outlet 4, and the upper end of the elevator door 17 is fixedly connected to the upper end face of the inlet / outlet 4.

[0028] As shown in Figures 1 and 2, the heating element group 6 is divided into several zones, and the zones of the heating element group 6 are controlled by the master controller 12.

[0029] As shown in Figure 3, the water pipe 7 is positioned inside the top part of the muffle 2 and its orientation is consistent with the shape of the air guide strip 8.

[0030] As shown in Figures 1, 3 and 4, there are several maintenance pipes 18 on the muffle top 2. The maintenance pipes 18 are connected to the heating element group 6 and are fixedly connected to the muffle top 2.

[0031] In operation, the heating element group 6 is turned on using the main controller 12, allowing the space between the muffle top 2 and the furnace bottom 1 to be heated. The heating element group 6 can be controlled in zones. At the same time, nitrogen is introduced into the atmosphere nitrogen preheating chamber 3 through the nitrogen pipe 5 and then into the brazing furnace. Then, the lifting door 17 is manually pushed upward to open the inlet and outlet 4. The metal to be processed is carried from the ramp 16 into the inlet and outlet 4 and placed around the muffle top 2 and the furnace bottom 1. During operation, the lifting door 17 seals the inlet and outlet 4. After operation, it can move in the same direction and exit through the inlet and outlet 4. Throughout the process, the hot air is contained at the top by the muffle top 2 and circulated by the air guides 8. Cold water is injected into one end of water pipe 7, and excess heat energy is used to heat the water. Finally, the heated water is collected from the other end of water pipe 7. If the furnace temperature is too high during operation, the main controller 12 can send a command to the controller 15 to raise the baffle 13 with the telescopic cylinder 14, allowing the heat dissipation holes to dissipate heat quickly. The base 9 and the heat insulation layer 10 are for the safety and heat preservation of the brazing furnace. The main controller 12 is a main control system. The command devices are all existing technologies, so they will not be described in detail here. If there is a problem with the heating element group 6, it can also be repaired through the maintenance pipe 18. The maintenance is more convenient, achieving the purpose of lower energy consumption and recovering excess heat energy.

Claims

1. A low-energy-consumption waste heat recovery brazing furnace, characterized in that it comprises: The furnace bottom (1) has an annular cross-sectional shape and is placed on a plane; the muffle top (2) is placed on the upper surface of the furnace bottom (1), and the cross-sectional shape of the muffle top (2) is U-shaped. Both ends of the U-shaped opening of the muffle top (2) are fixedly connected to the upper surface of the furnace bottom (1) and form an internal space with the furnace bottom (1). The orientation of the muffle top (2) is consistent with the shape of the furnace bottom (1). Several air guide strips (8) are fixed on the inner top of the muffle top (2). The air guide strips (8) are arranged in a ring outward from the center of the furnace bottom (1); the nitrogen preheating chamber (3) is placed on the side of the muffle top (2), and the centerline of the nitrogen preheating chamber (3) is tangent to the centerline of the shape of the furnace bottom (1). The interior of the nitrogen preheating chamber (3) is connected to the internal space formed by the furnace bottom (1) and the muffle top (2). The nitrogen preheating chamber (3) is fixedly connected to the muffle top (2) and the furnace bottom (1) respectively. A nitrogen pipe (5) is connected to the gas preheating chamber (3), and the gas flow direction of the nitrogen pipe (5) is tangent to the center line of the furnace bottom (1); the inlet and outlet (4) are placed on the side of the muffle top (2), and the center line of the inlet and outlet (4) is tangent to the center line of the furnace bottom (1). The position of the inlet and outlet (4) is perpendicular to the atmosphere nitrogen preheating chamber (3) and overlaps with the interior of the atmosphere nitrogen preheating chamber (3); heating element groups (6) are respectively covered on the wall of the muffle top (2). Inside the top wall of the nitrogen preheating chamber (3), the heating element group (6) is fixedly connected to the muffle roof (2) and the nitrogen preheating chamber (3) respectively; the water pipe (7) is placed outside the muffle roof (2) at both ends, the pipe body of the water pipe (7) is placed inside the top of the muffle roof (2), and the water pipe (7) is connected to the inner top surface of the muffle roof (2); the master controller (12) is placed outside the muffle roof (2), and the heating element group (6) is connected to the master controller (12) for control.

2. The low-energy-consumption waste heat recovery brazing furnace according to claim 1, characterized in that, A base (9) is laid on the bottom surface of the furnace bottom (1). The base (9) is fixedly connected to the furnace bottom (1). The base (9) is made of heat-insulating and fireproof material.

3. The low-energy-consumption waste heat recovery brazing furnace according to claim 1, characterized in that, The outer surface of the muffle roof (2) is covered with a heat insulation layer (10), which is fixedly connected to the muffle roof (2). The heat insulation layer (10) is a heat insulation material.

4. The low-energy-consumption waste heat recovery brazing furnace according to claim 1, characterized in that, The muffle top (2) has several heat dissipation holes (11) on its upper surface. The heat dissipation holes (11) are staggered with the air guide strip (8). A baffle (13) is installed inside the heat dissipation hole (11). The baffle (13) is connected to the main controller (12) for control.

5. A low-energy-consumption waste heat recovery brazing furnace according to claim 4, characterized in that, A telescopic cylinder (14) is provided on the bottom surface of the baffle (13). One end of the telescopic cylinder (14) is fixedly connected to the lower end face of the baffle (13), and the other end of the telescopic cylinder (14) is fixedly connected to the step inside the heat dissipation hole (11). A controller (15) is provided on the muffle top (2). The controller (15) is electrically connected to the telescopic cylinder (14), and the controller (15) is controlled by the master controller (12).

6. The low-energy-consumption waste heat recovery brazing furnace according to claim 1, characterized in that, The lower end face of the inlet and outlet (4) is provided with a ramp (16), the high side of the ramp (16) corresponds to the inlet and outlet (4) and is fixedly connected to the furnace bottom (1).

7. A low-energy-consumption waste heat recovery brazing furnace according to claim 6, characterized in that, The inlet / outlet (4) is covered by a lifting door (17), and the upper end of the lifting door (17) is fixedly connected to the upper surface of the inlet / outlet (4).

8. The low-energy-consumption waste heat recovery brazing furnace according to claim 1, characterized in that, The heating element group (6) is divided into several zones, and the zones of the heating element group (6) are controlled by the master controller (12).

9. A low-energy-consumption waste heat recovery brazing furnace according to claim 1, characterized in that, The water pipe (7) is positioned inside the top part of the muffle roof (2) and its shape is consistent with that of the air guide strip (8).

10. A low-energy-consumption waste heat recovery brazing furnace according to claim 1, characterized in that, The muffle roof (2) is provided with several maintenance pipes (18), the maintenance pipes (18) are connected to the heating element group (6), and the maintenance pipes (18) are fixedly connected to the muffle roof (2).

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