A large-capacity annular atmosphere sintering furnace

Abstract

This utility model belongs to the field of metallurgical equipment technology and provides a large-capacity annular atmosphere sintering furnace, including a vertically arranged upper furnace body and a lower furnace body. Insulation layers are installed inside both the upper and lower furnace bodies. Heating elements are arranged in a circular array on the upper furnace body. The lower furnace body is detachably connected to the bottom of the upper furnace body. A central heating element is vertically installed in the middle of the lower furnace body. Multiple charging platforms are installed on the lower furnace body, on which multiple layers of boats or material plates can be detachably stacked. This utility model adopts a vertical structure, with the upper furnace body at the top providing circumferential heating in upper and lower sections. Material is fed upwards through the lower furnace body, and the central heating element in the lower furnace body, in conjunction with the surrounding heating elements in the upper furnace body, improves the uniformity of the furnace temperature. The lower furnace body, combined with the charging platforms and boats or material plates, makes the charging and feeding operation more convenient. The air inlet pipes can be adaptively arranged in terms of angle and spacing according to the stacking height of the boats or material plates, ensuring that each layer of boats or material plates meets the atmosphere requirements.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical equipment technology, and in particular relates to a large-capacity annular atmosphere sintering furnace. Background Technology

[0002] Atmosphere sintering furnaces are specialized equipment that enable materials to complete the sintering process in a specific gas environment by precisely controlling temperature, atmosphere, and pressure parameters. The operating temperature ranges from 1200℃ to 1800℃, and inert gases such as nitrogen and argon or customized mixed atmospheres can be introduced to meet the preparation needs of high-performance materials such as ceramics and metal composites.

[0003] Most existing atmosphere sintering furnaces are horizontal structures with an integral cylindrical body. When there is a need for a large amount of material, transportation constraints prevent horizontal sintering furnaces from increasing their length, thus limiting the amount of material that can be loaded. Therefore, some vertical sintering furnaces have also emerged, but existing vertical sintering furnaces still suffer from poor furnace temperature and atmosphere uniformity. Utility Model Content

[0004] This invention provides a large-capacity annular atmosphere sintering furnace, which aims to solve the above-mentioned technical problems.

[0005] This utility model is implemented as follows: a large-capacity annular atmosphere sintering furnace includes a vertically arranged upper furnace body and a lower furnace body. The interior of the upper furnace body and the lower furnace body are equipped with a heat insulation layer. The inner wall of the heat insulation layer of the upper furnace body is equipped with a heating element arranged in a ring array. The lower furnace body is detachably connected to the bottom of the upper furnace body. A central heating element is vertically installed in the middle of the lower furnace body. Multiple charging platforms are installed around the central heating element in the lower furnace body. Multiple layers of boats or material plates are detachably stacked on the charging platforms.

[0006] Furthermore, the inner walls of the upper furnace body and the lower furnace body are respectively provided with water-cooled furnace body interlayers, and the water-cooled furnace body interlayers are connected to vacuum extraction pipes, one end of which extends to the outside of the upper furnace body and the lower furnace body.

[0007] Furthermore, a first grease discharge pipe is provided below the charging platform, penetrating the lower furnace body, with one end of the first grease discharge pipe extending to the outside of the lower furnace body.

[0008] Furthermore, a second grease drain pipe is connected to the cavity between the insulation layer of the lower furnace body and the water-cooled furnace body interlayer of the lower furnace body, and the second grease drain pipe extends to the outside of the lower furnace body.

[0009] Furthermore, the first and second grease discharge pipes extend to one end outside the lower furnace body and are connected to a grease storage tank. One end of the grease storage tank is provided with a grease discharge port that can be sealed, opened, and closed.

[0010] Furthermore, the bottom of the lower furnace body and the upper furnace body are connected by a quick-release corrugated flexible joint.

[0011] Furthermore, the lower furnace body is vertically connected to an air inlet pipe between adjacent charging platforms, and the bottom of the air inlet pipe extends to the outside of the lower furnace body and is connected to an air source.

[0012] Furthermore, the intake pipe has multiple pairs of exhaust holes in the vertical direction.

[0013] Furthermore, the inner wall of the insulation layer of the upper furnace body has a ring array of two sets of heating elements that can be controlled separately. The two sets of heating elements are located in the upper half and lower half of the inner wall of the insulation layer of the upper furnace body, respectively.

[0014] Furthermore, each of the two sets of heating elements is connected to a temperature measuring component, one end of which extends to the outside of the upper furnace body and is installed on the outer wall of the upper furnace body.

[0015] This utility model provides a large-capacity annular atmosphere sintering furnace with a vertical structure. The upper and lower furnace bodies can be disassembled for transport, allowing for the construction of larger equipment with greater material loading capacity. The sintering furnace features a top-mounted upper furnace body with sectional heating, while material is fed upwards through the lower furnace body. The central heating element in the lower furnace body, in conjunction with the surrounding heating elements in the upper furnace body, enhances the uniformity of the furnace temperature. The lower furnace body, combined with a loading platform and boats or plates, facilitates convenient loading and feeding. The air inlet pipes can be adaptively arranged in terms of angle and spacing according to the stacking height of the boats or plates, ensuring that each layer of boats or plates meets the atmosphere requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the large-capacity annular atmosphere sintering furnace provided in this embodiment of the utility model.

[0017] Figure 2 yes Figure 1 A structural diagram from another perspective.

[0018] Figure 3 yes Figure 2 AA section view in the image.

[0019] Figure 4 This is a schematic diagram of the lower furnace body.

[0020] Figure 5 yes Figure 4 Partial top view.

[0021] Figure 6 yes Figure 4 A structural diagram from another perspective.

[0022] Figure 7 yes Figure 6 BB section view in the middle.

[0023] Figure 8 This is a schematic diagram of the upper furnace body.

[0024] Figure 9 yes Figure 8 CC section view.

[0025] Figure 10 This is a schematic diagram of the intake pipe.

[0026] Figure 11 This is a structural diagram of the loading platform and the vessel.

[0027] The numbers in the diagram represent: 1-Upper furnace body, 2-Lower furnace body, 3-Insulation layer, 4-Heating element, 5-Central heating element, 6-Loading platform, 7-Boat dish, 8-Water-cooled furnace body jacket, 9-Vacuum extraction pipe, 10-First grease discharge pipe, 11-Second grease discharge pipe, 12-Grease storage tank, 13-Grease discharge port, 14-Air inlet pipe, 15-Exhaust hole, 16-Temperature measuring component, 17-Support frame. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] See Figures 1-11 This utility model provides a large-capacity annular atmosphere sintering furnace, including an upper furnace body 1 and a lower furnace body 2 arranged vertically. The upper furnace body 1 and the lower furnace body 2 are equipped with a heat insulation layer 3 inside. The inner wall of the heat insulation layer 3 of the upper furnace body 1 is equipped with a heating element 4 arranged in annular array.

[0030] The upper furnace body 1 has a cylindrical structure with an arched top, which is fixed by a support frame 17. The insulation layer 3 is a cylindrical structure with an open bottom. The insulation layer 3 can be made of ceramic fiber, polycrystalline mullite fiber, hard refractory material or carbon / graphite material, and the selection is based on the working temperature required to cover the atmosphere sintering furnace.

[0031] The interior of the upper furnace body 1 adopts a circumferential ring heating system. The inner wall of the insulation layer 3 is equipped with a ring array of heating elements 4 for heating the interior of the furnace body. The heating elements 4 can be made of iron-chromium-aluminum alloy, nickel-chromium alloy, silicon carbide rod or silicon molybdenum rod, and the selection is based on the working temperature required by the atmosphere sintering furnace.

[0032] In this embodiment of the present invention, the heating element 4 inside the upper furnace body 1 is divided into upper and lower sections. Specifically, the inner wall of the insulation layer 3 of the upper furnace body 1 has two sets of heating elements 4 arranged in a ring array that can be controlled separately. The two sets of heating elements 4 are located in the upper half and lower half of the inner wall of the insulation layer 3 of the upper furnace body 1, respectively.

[0033] The two sets of heating elements 4 in the upper and lower halves of the upper furnace body 1 can be controlled to heat independently, and different temperature ranges can be formed inside the furnace body according to the needs to meet the sintering requirements under different conditions.

[0034] Correspondingly, the two sets of heating elements 4 are respectively connected to temperature measuring components 16, one end of which extends to the outside of the upper furnace body 1 and is installed on the outer wall of the upper furnace body 1.

[0035] The temperature measuring component 16 can be an S-type, B-type, K-type, N-type or C / W5-type thermocouple with a ceramic protective sleeve. The signal output end of the thermocouple is connected to the outer wall of the furnace body 1.

[0036] The lower furnace body 2 is detachably connected to the bottom of the upper furnace body 1. A central heating element 5 is vertically installed in the middle of the lower furnace body 2. Multiple loading platforms 6 are installed around the central heating element 5 in the lower furnace body 2. Multiple layers of boats 7 or material plates can be detachably stacked on the loading platforms 6.

[0037] The lower furnace body 2 is coaxially arranged with the upper furnace body 1. The lower furnace body 2 is connected to or separated from the upper furnace body 1 at the bottom of the upper furnace body 1. The lower furnace body 2 is driven to rise or fall by existing mechanical lifting equipment, such as a hydraulic lift connected to the outside of the lower furnace body 2.

[0038] In this embodiment of the invention, the bottoms of the lower furnace body 2 and the upper furnace body 1 can be sealed together using existing connection methods such as quick-release corrugated flexible joints, bolt flange connections, clamp-type quick-opening connections, and rotary bayonet connections. For example, when using a bolt flange connection, flanges with sealing grooves are machined on the mating end faces of the upper furnace body 1 and the lower furnace body 2, one flange has a through hole machined on it, and the other flange has a threaded hole corresponding to the through hole. Before the upper furnace body 1 and the lower furnace body 2 are mated, a metal sealing ring, such as a copper ring, is placed in the sealing groove. Then, the upper furnace body 1 and the lower furnace body 2 are aligned and closed, and bolts are used to pass through the through hole and the threaded hole to tighten and compress the metal sealing ring to achieve a sealed connection.

[0039] A heat insulation layer 3 is installed on the top of the lower furnace body 2. Multiple charging platforms 6 are installed on the top of the heat insulation layer 3, and the multiple charging platforms 6 are arranged around the central heating element 5. Multiple layers of boats 7 or material plates can be stacked inside each charging platform 6 for holding materials. The central heating element 5, together with the heating elements 4 arranged in a ring array, can improve the temperature uniformity inside the furnace body, so that the inner and outer sides of the material can be heated evenly.

[0040] The inner walls of the upper furnace body 1 and the lower furnace body 2 are respectively provided with water-cooled furnace body interlayers 8, and the water-cooled furnace body interlayers 8 are connected to vacuum extraction pipes 9. One end of the vacuum extraction pipes 9 extends to the outside of the upper furnace body 1 and the lower furnace body 2.

[0041] Before the atmosphere sintering furnace starts operating, a vacuum is drawn into the water-cooled furnace body jacket 8 using the vacuum extraction pipe 9 to improve the furnace body's insulation performance. After the atmosphere sintering furnace starts operating, water can be injected into the water-cooled furnace body jacket 8 to assist in cooling the furnace body.

[0042] A first grease discharge pipe 10 is installed below the charging platform 6, penetrating through the lower furnace body. One end of the first grease discharge pipe 10 extends to the outside of the lower furnace body 2.

[0043] The insulation layer 3 of the lower furnace body 2 is connected to the cavity before the water-cooled furnace body interlayer 8 of the lower furnace body 2 by a second grease drain pipe 11, which extends to the outside of the lower furnace body 2.

[0044] The first grease discharge pipe 10 and the second grease discharge pipe 11 extend to the outside of the lower furnace body 2 and are connected to a grease storage tank 12. One end of the grease storage tank 12 is provided with a grease discharge port 13 that can be sealed, opened and closed.

[0045] The first grease discharge pipe 10 and the second grease discharge pipe 11 can quickly transfer the impurity gas inside the furnace body and cavity, and collect it through the grease storage tank 12. The impurity gas collected in the grease storage tank 12 can be further processed by opening the grease discharge port 13.

[0046] The lower furnace body 2 is vertically connected to an air inlet pipe 14 between adjacent charging platforms 6. The bottom of the air inlet pipe 14 extends to the outside of the lower furnace body 2 and is connected to an air source.

[0047] The intake pipe 14 has multiple pairs of exhaust holes 15 in the vertical direction.

[0048] The bottom of the intake pipe 14 is connected to the air source via an air duct interface. The intake pipe 14 is made of carbon fiber material. The length of the intake pipe 14 and the number of exhaust holes 15 can be adaptively set according to the stacking height of the boats 7 on the loading platform 6, so that each layer of boats 7 corresponds to at least one pair of exhaust holes 15, ensuring that each layer of boats 7 receives an equal amount of atmosphere. In addition, the included angle of each pair of exhaust holes 15 can be adjusted according to the angle set by two adjacent loading platforms 6, so that the gas discharged from the exhaust holes 15 can be accurately delivered to the boats 7.

[0049] In this utility model, all connections between components that span the interior and exterior of the furnace body are sealed. Other parts not shown in the accompanying drawings, such as the vacuum system connecting the vacuum extraction pipe 9, the mechanical lifting system that drives the lower furnace body 2 to rise and fall, and the steel structure supporting the upper furnace body 1, are consistent with the relevant supporting equipment of conventional industrial vacuum furnaces in the prior art.

[0050] In summary, the large-capacity annular atmosphere sintering furnace provided in this embodiment of the present invention is used by placing materials on boats 7, stacking multiple boats 7 on the charging platform 6, lifting the lower furnace body 2 using a mechanical lifting system, and connecting the lower furnace body 2 and the upper furnace body 1 using quick-release corrugated flexible joints. Air is extracted from the water-cooled furnace body jacket 8 through the vacuum extraction pipe 9, and then the vacuum extraction pipe 9 is sealed. The heating element 4 and the central heating element 5 are activated, and the temperature inside the furnace is monitored in real time using the temperature measuring component 16, and the heating temperatures of the heating element 4 and the central heating element 5 are adjusted as needed to maintain uniform temperature throughout the furnace. The air inlet pipe 14 is connected to the air source through the air duct interface to deliver a protective atmosphere into the furnace body. The protective atmosphere is blown to each layer of boats 7 through the exhaust holes 15 on the air inlet pipe 14. Impurity gases generated during the operation of the sintering furnace are transferred to the grease storage tank 12 through the first grease discharge pipe 10 and the second grease discharge pipe 11, and can be further processed later by opening the grease discharge port 13.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A large capacity ring-type atmosphere sintering furnace characterized by comprising: It includes a vertically arranged upper furnace body and a lower furnace body, and the interior of the upper furnace body and the lower furnace body are equipped with a heat insulation layer. The inner wall of the heat insulation layer of the upper furnace body is equipped with a heating element in a ring array. The lower furnace body is detachably connected to the bottom of the upper furnace body. A central heating element is vertically installed in the middle of the lower furnace body. Multiple loading platforms are installed around the central heating element in the lower furnace body. Multiple layers of boats or material plates are detachably stacked on the loading platforms.

2. The large capacity ring atmosphere sintering furnace according to claim 1, wherein The inner walls of the upper furnace body and the lower furnace body are respectively provided with water-cooled furnace body interlayers, and the water-cooled furnace body interlayers are connected to vacuum extraction pipes, one end of which extends to the outside of the upper furnace body and the lower furnace body.

3. The large capacity ring atmosphere sintering furnace according to claim 2, wherein A first grease discharge pipe is provided below the charging platform, penetrating the lower furnace body, with one end of the first grease discharge pipe extending to the outside of the lower furnace body.

4. The large capacity ring atmosphere sintering furnace according to claim 3, wherein The insulation layer of the lower furnace body is connected to the cavity before the water-cooled furnace body interlayer of the lower furnace body by a second grease discharge pipe, which extends to the outside of the lower furnace body.

5. The large-capacity annular atmosphere sintering furnace according to claim 4, characterized in that, The first and second grease discharge pipes extend to one end outside the lower furnace body and are connected to a grease storage tank. One end of the grease storage tank is provided with a grease discharge port that can be sealed, opened, and closed.

6. The large-capacity annular atmosphere sintering furnace according to claim 1, characterized in that, The bottom of the lower furnace body and the upper furnace body are connected by a quick-release corrugated flexible joint.

7. The large-capacity annular atmosphere sintering furnace according to claim 1, characterized in that, The lower furnace body is vertically connected to an air inlet pipe between adjacent charging platforms, and the bottom of the air inlet pipe extends to the outside of the lower furnace body and is connected to an air source.

8. The large-capacity annular atmosphere sintering furnace according to claim 7, characterized in that, The intake pipe has multiple pairs of exhaust holes in the vertical direction.

9. The large-capacity annular atmosphere sintering furnace according to claim 1, characterized in that, The inner wall of the insulation layer of the upper furnace body has two sets of heating elements arranged in a ring array, each of which can be controlled independently. The two sets of heating elements are located in the upper half and lower half of the inner wall of the insulation layer of the upper furnace body, respectively.

10. The large-capacity annular atmosphere sintering furnace according to claim 9, characterized in that, The two sets of heating elements are respectively connected to temperature measuring components, one end of which extends to the outside of the upper furnace body and is installed on the outer wall of the upper furnace body.

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