An anti-oxidation device suitable for a molybdenum-based alloy reaction kettle

Abstract

This invention relates to the technical field of anti-oxidation devices for reactors, specifically an anti-oxidation device suitable for molybdenum-based alloy reactors. The device includes a reactor with a sealing cap fixedly installed at its upper end. An integrated pipe passes through the upper end of the sealing cap for connecting to an external gas source. An isolation sleeve is fixedly connected to the end of the integrated pipe near the reactor, and the isolation sleeve is located below the sealing cap. Multiple outer protective tubes are arranged below the isolation sleeve, and a multi-stage nozzle device is installed inside each outer protective tube. A movable tube passes through the outer protective tube, and inert gas inside the movable tube is released through a gas guide hole. With the coordinated flow of gas through the gas guide holes between the multiple outer protective tubes, the inert gas is more efficiently and evenly filled into the reactor, thereby improving the gas filling efficiency and the uniformity of gas distribution. This helps to stabilize and control the reaction environment and avoid interference from localized oxygen residue.

Description

Technical Field

[0001] This invention relates to the technical field of anti-oxidation devices for reactors, specifically an anti-oxidation device suitable for molybdenum-based alloy reactors. Background Technology

[0002] Molybdenum-based alloys (such as Mo-Zr-Ti, TZM, etc.) are widely used in high-temperature reactors in the chemical, metallurgical and nuclear industries due to their excellent high-temperature strength (>1000℃), corrosion resistance and thermal conductivity. However, when the operating temperature exceeds 400℃, molybdenum alloys will undergo a violent oxidation reaction with oxygen to generate volatile MoO3 (sublimation point 795℃), leading to rapid material failure. Statistics show that after unprotected molybdenum alloy reactors have been working continuously in an oxidizing atmosphere for 200 hours, the wall thickness loss can reach 3-5mm, which seriously affects the service life of the equipment.

[0003] A search revealed that prior art publication number CN217910387U discloses an oxidation-resistant synthesis reactor, comprising a reactor body, a first water pump, and an inert gas tank. The reactor body includes a vessel body, a frame, and an electric stirring mechanism. The bottom of the vessel body has a first discharge port and a second discharge port, and the top of the vessel body has several inlets, including a first inlet and a second inlet. The first inlet is used to input water. The frame is installed on the top of the vessel body. The electric stirring mechanism is installed on the frame, and its stirrer extends into the interior of the vessel body. The inlet of the first water pump is connected to the second discharge port. The inert gas tank is installed on the frame, and its vent is located at the bottom. The vent is connected to the second inlet, and a switch valve is provided between them. This design replaces the air inside the reactor with inert gas without creating extremely low pressure inside the reactor, thereby effectively reducing the risk of damage to the reactor.

[0004] Therefore, based on the above-mentioned search and combined with existing technologies, existing reactors typically inject inert gas into their interior by setting up gas delivery pipes or valve structures to isolate oxygen in the air and maintain the stability of the reaction environment. However, since most devices use a single channel or single-point injection method, the inert gas is unevenly distributed in the reactor, which can easily lead to residual oxygen in local areas, making it difficult to form an ideal inert atmosphere environment. This, in turn, affects the stability of the reaction process and the purity of the product. During long-term use, local residual oxygen may also cause selective oxidation of the inner wall of the reactor, which will gradually spread from the oxidized area, ultimately affecting the overall service life and structural safety of the reactor. Therefore, this application proposes an anti-oxidation device suitable for molybdenum-based alloy reactors. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-oxidation device suitable for molybdenum-based alloy reactors, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an anti-oxidation device suitable for a molybdenum-based alloy reactor, comprising a reactor, a sealing cover fixedly installed at the upper end of the reactor, an integrated pipe passing through the upper end of the sealing cover for connecting to an external gas source, an isolation sleeve fixedly connected to the end of the integrated pipe near the reactor, and the isolation sleeve being located below the sealing cover, a plurality of outer protective pipes sequentially connected by connecting rings being arranged below the isolation sleeve, a bottom pipe being connected below the bottommost outer protective pipe by another connecting ring, a multi-stage nozzle device being arranged inside the outer protective pipe for spraying inert gas to achieve stratified supply of reaction gas and protect the inner wall of the reactor from oxidation, and a temperature-controllable heating device being arranged at the bottom of the reactor for heating the internal chamber of the reactor;

[0007] As a further embodiment of the present invention, the multi-stage nozzle device includes a central tube, which is inserted inside the outer protective tube, and the end of the central tube away from the outer protective tube is fixedly connected to the isolation sleeve. A movable tube is inserted through the inner end of the central tube, and the stabilizing sleeve and the heating sleeve are sequentially sleeved on the outer surface of the central tube. As a further embodiment of the present invention, the heating jacket is fixedly connected to the bottom tube, the stabilizing jacket is fixedly connected to the outer protective tube, the stabilizing jacket has two air guide holes inside, and the air guide holes are located below the outer protective tube. A flow-limiting ring is fixedly installed on the outer surface of the central tube. This structure, by fixing the heating jacket to the bottom tube and the stabilizing jacket to the outer protective tube respectively, and setting air guide holes in the stabilizing jacket, can realize the effective introduction and distribution of inert gas and improve the gas filling efficiency. As a further embodiment of the present invention, two connecting pipes are fixedly installed at the inner end of the stabilizing sleeve, and the connecting pipes are connected to the air guide hole. An unlocking ring is fixedly connected to the upper end of the heating sleeve, and multiple triangular blocks are fixedly installed at the upper end of the unlocking ring. This structure realizes the smooth guidance and flow of gas by installing connecting pipes at the inner end of the stabilizing sleeve and connecting them to the air guide hole. As a further embodiment of the present invention, the triangular block corresponds to the connecting pipe, and an air outlet plug is provided at the inner end of the connecting pipe. A snap-fit ​​plate is fixedly connected to the outer surface of the air outlet plug, and the outer surface of the snap-fit ​​plate contacts the inclined surface of the outer surface of the triangular block. This structure achieves precise gas release and control through the design of the triangular block corresponding to the connecting pipe and cooperating with the air outlet plug. The design of the snap-fit ​​plate contacting the inclined surface of the triangular block allows the air outlet plug to be flexibly adjusted when needed. As a further embodiment of the present invention, a passive ring is sleeved on the outer surface of the central tube. The passive ring is located below the bottom tube and is fixedly installed at the bottom end of the movable tube. When the bottom tube moves downward, it pushes the passive ring, causing the movable tube to move downward as well. This structure, by sleeved on the outer surface of the central tube and fixed at the bottom end of the movable tube, can effectively push the passive ring and drive the movable tube downward when the bottom tube moves downward, thereby achieving precise movement and control of the movable tube.

[0008] As a further embodiment of the present invention, the outer protective tube and the bottom tube are connected by a connecting ring, and the upper and lower ends of the connecting ring are respectively sleeved on the adjacent ends of the outer protective tube and the bottom tube. An output tube is inserted through the inner end of the integrated tube, and a connecting sleeve is sleeved on the outer surface of the output tube. The connecting sleeve is fixedly connected to the inner wall of the integrated tube, and two reset tubes are fixedly connected to the end of the connecting sleeve near the isolation sleeve.

[0009] As a further embodiment of the present invention, the reset tube and the passive rod are interleaved, and air guide grooves are provided inside both the connecting sleeve and the reset tube. An output hole is provided on the outer surface of the output tube. The output hole is located inside the connecting sleeve. The output hole on the outer surface of the output tube is interleaved with the upper end of the air guide groove. After the output tube is rotated, the output hole and the air guide groove are interconnected. An inner tube is provided between the passive rod and the reset tube, and the output tube passes through the outer surface of the inner tube.

[0010] As a further embodiment of the present invention, a heating tube for preheating inert gas is wound around the outer surface of the reactor, an outlet pipe is provided at the upper end of the sealing cover, the inlet end of the outlet pipe is provided inside the reactor, and a spiral tube is provided inside the outlet pipe. The spiral tube and the heating tube are fixedly connected by a conductive tube.

[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. When using this invention, the inert gas in the active tube is released through the gas guide hole, and with the help of the gas guide holes set between multiple outer protective tubes, the inert gas is more efficiently and evenly filled into the interior of the reactor, thereby improving the gas filling efficiency and the uniformity of gas distribution, which helps to stabilize and control the reaction environment and avoid local oxygen residue from interfering with the reaction. 2. After production is completed, the device is controlled by rotating the diversion cover, which drives the output pipe to rotate and connect the output hole with the gas guide groove, thereby guiding the inert gas into the gas guide groove. As the pressure in the gas guide groove rises, the push rod drives the passive rod to move upward, and the traction rod further drives the bottom pipe to move upward, so that the outer protective pipe re-contacts the bottom pipe and seals the gas guide hole, thereby preventing gas leakage. 3. The present invention moves the heated jacket upward synchronously, and the liquid aluminum alloy inside it re-encapsulates the flow-limiting ring and solidifies during the cooling process to form a stable positioning structure. This process not only realizes the automatic reset and sealing of the gas circuit system of the device, but also provides a structural limiting function through the solidification of aluminum alloy, effectively preventing the outer protective tube and the bottom tube from being misaligned or sliding under the action of gravity, thereby improving the overall safety, sealing and reusability of the device. 4. The inert gas is preheated by the exhaust gas to prevent the low-temperature inert gas from entering the reactor and causing localized sudden cooling and stress cracks, which would affect the normal operating temperature inside the reactor and disrupt the reaction equilibrium. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of an anti-oxidation device suitable for molybdenum-based alloy reactors; Figure 2 This is a schematic diagram of the internal structure of the reactor; Figure 3 This is a schematic diagram of the structure at the bottom of the sealing cap; Figure 4 This is a schematic diagram of the internal structure of the integrated tube; Figure 5 This is a schematic diagram of the structure at the junction of the output tube and the inner tube; Figure 6 This is a schematic diagram of the internal structure of the output tube and the inner tube; Figure 7 This is a schematic diagram of a multi-stage nozzle device. Figure 8 This is a schematic diagram of the internal structure of the outer protective tube and the bottom tube; Figure 9 This is a schematic diagram of the internal structure of the stabilizing jacket and the heat-receiving jacket. Figure 10 This is a schematic diagram of the internal structure of a connecting pipe; Figure 11 This is a schematic diagram of the internal structure of the central tube; Figure 12 This is a schematic diagram showing the positional relationship between the inner tube and the flow-blocking block; Figure 13 This is a schematic diagram of the internal structure of the vent pipe.

[0013] In the diagram: 1. Reactor; 2. Heating pipe; 3. Sealing cap; 4. Drive motor; 5. Integrated pipe; 6. Insulation pipe; 7. Gas outlet pipe; 8. Conductor pipe; 11. Spiral tube; 12. Diverter cap; 13. Stirring rod; 101. Isolation sleeve; 102. Outer protective tube; 103. Bottom tube; 104. Traction rod; 105. Connecting ring; 201. Output tube; 202. Connecting sleeve; 203. Reset tube; 204. Passive rod; 205. Push rod; 206. Inner tube; 207. Flow block; 208. Auxiliary spring; 209. Reversing rod; 210. Plug plate; 211. Air guide groove; 212. Output hole; 301. Central tube; 302. Moving tube; 303. Stabilizing sleeve; 304. Heating sleeve; 305. Passive ring; 401. Connecting pipe; 402. Air guide hole; 403. Flow limiting ring; 404. Unlocking ring; 405. Triangular block; 406. Snap-fit ​​plate; 407. Air outlet plug. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Example 1: Please refer to Figure 1 - Figure 5 An anti-oxidation device for a molybdenum-based alloy reactor includes a reactor 1. A sealing cover 3 is bolted to the upper end of the reactor 1. A drive motor 4 is bolted to the upper end of the sealing cover 3. A stirring rod 13 is fixedly installed at the output end of the drive motor 4 and passes through the interior of the reactor 1. The output end of the drive motor 4 drives the stirring rod 13 to rotate, thereby accelerating the mixing efficiency of the substances inside the reactor 1. An integrated pipe 5 passes through the upper end of the sealing cover 3 for connecting to an external gas source. An isolation sleeve 101 is fixedly connected to the end of the integrated pipe 5 near the reactor 1, and the isolation sleeve 101 is located below the sealing cover 3. Multiple outer protective tubes 102 are arranged below the isolation sleeve 101, and the interior of the outer protective tubes 102 is provided with... There is a multi-stage nozzle device for spraying inert gas to protect the inner wall of the reactor 1 from oxidation (such as argon + ammonia mixture, krypton, argon). The bottom of the reactor 1 is equipped with a temperature-controllable heating device to heat the internal chamber of the reactor 1. The heating device is a mature existing technology and will not be described in detail here. During the operation of the reactor 1, since the mass of the inert gas is greater than that of oxygen, when the inert gas is continuously filled into the reactor, the inert gas will naturally settle at the bottom of the reactor 1. As the amount of inert gas increases, oxygen will gradually be discharged from the top of the sealing cover 3, thereby effectively preventing the inner wall of the reactor 1 from oxidation under high temperature conditions. The bottom of the sealing cover 3 is equipped with an oxygen concentration sensor to monitor the oxygen content inside the reactor 1 in real time.

[0016] Below the isolation sleeve 101, there are multiple outer protective tubes 102 connected in sequence by connecting rings 105. Below the lowest outer protective tube 102, there is a bottom tube 103 connected by another connecting ring 105. Limiting blocks are fixedly installed on the outer surfaces of the outer sheath 102 and the bottom tube 103. The limiting blocks are located inside the connecting ring 105. The ends of two adjacent outer sheaths 102 are connected by the connecting ring 105, and their relative movement distance is limited by the limiting blocks. Specifically, the outer sheath 102, the connecting ring 105 and the bottom tube 103 are all made of high-temperature resistant metal materials (such as tungsten, nickel-based high-temperature alloys, molybdenum alloys, etc.).

[0017] like Figure 3 - Figure 6 As shown, an output tube 201 is inserted through the inner end of the integrated tube 5, and a connecting sleeve 202 is fitted on the outer surface of the output tube 201. The connecting sleeve 202 is fixedly connected to the inner wall of the integrated tube 5. Two reset tubes 203 are fixedly connected to one end of the connecting sleeve 202 near the isolation sleeve 101, and the reset tubes 203 and the passive rod 204 are interleaved. The passive rod 204 is connected to the isolation sleeve 101 by an auxiliary spring 208. Air guide grooves 211 are opened inside the connecting sleeve 202 and the reset tubes 203. An output hole 212 is opened on the outer surface of the output tube 201, and the output hole 212 is located inside the connecting sleeve 202. Specifically, the output hole 212 on the outer surface of the output pipe 201 is intersected with the upper end of the air guide groove 211. After the output pipe 201 is rotated, the output hole 212 and the air guide groove 211 are connected to each other. A limiting groove is opened at the upper end of the connecting sleeve 202. A protrusion is fixedly installed on the outer surface of the output pipe 201. The protrusion passes through the limiting groove. At this time, the rotation angle of the output pipe 201 is determined by the size of the space in the limiting groove. More specifically, an air venting groove is opened on the outer surface of the output pipe 201. The air venting groove corresponds to the outer surface of the air guide groove 211.

[0018] like Figures 4-7 As shown, the air guide groove 211 is U-shaped. A push rod 205 is installed through the outlet of the air guide groove 211. The end of the push rod 205 away from the isolation sleeve 101 is fixedly connected to the upper end of the push rod 205. When the outlet hole 212 is connected to the air guide groove 211, the inert gas blown out from the outlet hole 212 enters the interior of the air guide groove 211. Then the pressure inside the air guide groove 211 increases. At this time, the push rod 205 drives the passive rod 204 to move upward. A reversing rod 209 is fixedly installed inside the output pipe 201. Multiple grooves are opened on the outer surface of the reversing rod 209 to facilitate the flow of inert gas. A stopper plate 210 is rotatably installed at the bottom end of the reversing rod 209. Multiple notches are opened on the outer surface of the stopper plate 210, which correspond to the grooves on the outer surface of the reversing rod 209. When the reversing rod 209 rotates a certain angle (at which time the output hole 212 is connected to the gas guide groove 211), the notches on the outer surface of the stopper plate 210 and the grooves on the outer surface of the reversing rod 209 intersect each other. At this time, the inert gas will not pass through the stopper plate 210.

[0019] Example 2: Please refer to Figure 5 - Figure 8 , Figure 12 An anti-oxidation device suitable for molybdenum-based alloy reactor, based on Example 1, is provided with an inner tube 206 between the passive rod 204 and the reset tube 203, a plug plate 210 is fixedly welded to the inner end of the inner tube 206, and an output tube 201 passes through the outer surface of the inner tube 206, while a reversing rod 209 passes through the inside of the inner tube 206. The multi-stage nozzle device includes a central tube 301, which passes through the interior of the outer protective tube 102. The end of the central tube 301 furthest from the outer protective tube 102 is fixedly connected to the isolation sleeve 101. A movable tube 302 passes through the inner end of the central tube 301 and is fixedly connected to the inner tube 206 (e.g., ...). Figure 12 As shown, a flow-blocking block 207 is fixedly installed at the inner end of the inner tube 206. The flow-blocking block 207 is used to limit the flow resistance of the airflow, so that after the gas passes through the inner tube 206, it generates a certain resistance through the flow-blocking block 207, which causes it to generate a downward thrust.

[0020] Please see Figures 7-10 A stabilizing sleeve 303 and a heating sleeve 304 are sequentially fitted onto the outer surface of the central tube 301. A set of stabilizing sleeves 303 and heating sleeves 304 located inside the bottom tube 103 are fixedly connected to the outer protective tube 102 and the bottom tube 103, respectively. A set of stabilizing sleeves 303 and heating sleeves 304 located at the connection points of two adjacent outer protective tubes 102 are fixedly connected to those two adjacent outer protective tubes 102. A flow-limiting ring 403 is fixedly installed on the outer surface of the central tube 301, while the stabilizing sleeves 303 and heating sleeves located above the bottom tube 103... 304 is then fixedly connected to two adjacent outer protective tubes 102 in sequence. Specifically, the outer shell of the heat-receiving jacket is made of 304 stainless steel and filled with aluminum alloy material with a melting point of about 600℃, which is close to the normal working temperature range of the reactor 1. Different alloy materials with different melting points can also be replaced according to actual production needs. When the aluminum alloy is not melted, it wraps around the flow-limiting ring 403 to fix it. When the aluminum alloy melts, it loses the adhesive force on the flow-limiting ring 403, and the heat-receiving jacket 304 moves downward under the weight of the bottom tube 103. More specifically, the upper end of the bottom tube 103 wraps around the air vent 402 inside the stabilizing sleeve 303, so when the bottom tube 103 moves downward, the air vent 402 is exposed.

[0021] Please see Figure 9 , Figure 10 , Figure 11 Two connecting pipes 401 are fixedly installed at the inner end of the stabilizing sleeve 303, and the connecting pipes 401 are connected to the air guide hole 402. An unlocking ring 404 is fixedly welded to the upper end of the heating sleeve 304. Multiple triangular blocks 405 are fixedly installed at the upper end of the unlocking ring 404, and the triangular blocks 405 correspond to the connecting pipes 401. An air outlet plug 407 is inserted through the inner end of the connecting pipe 401. A strip-shaped hole is formed on the outer surface of the air outlet plug 407. After the air outlet plug 407 moves away from the connecting pipe 401, the strip-shaped hole is positioned between the inside and outside of the connecting pipe 401, allowing inert gas to flow through the air outlet plug 407 to the outside of the connecting pipe 401. A snap-fit ​​plate 406 is fixedly connected to the outer surface of 07. The outer surface of the snap-fit ​​plate 406 contacts the inclined surface of the outer surface of the triangular block 405. When the unlocking ring 404 moves downward, it drives the triangular block 405 to move, which in turn drives the snap-fit ​​plate 406 to move downward. As the activity space of the snap-fit ​​plate 406 increases, the vent plug 407 obtains enough movement space and can move freely. Conversely, after the triangular block 405 moves upward, it squeezes the snap-fit ​​plate 406 through the inclined surface, causing the vent plug 407 to move into the connecting pipe 401. At this time, the strip hole on the outer surface of the vent plug 407 will be wrapped by the connecting pipe 401, so that the inert gas cannot flow out. Specifically, the outer surface of the central tube 301 is provided with an air outlet, which corresponds to the connecting tube 401. The air outlet is strip-shaped, which allows the connecting tube 401 to communicate with the air outlet on the outer surface of the central tube 301 regardless of its location. The outer surface of the movable tube 302 is also provided with a strip-shaped air outlet, which communicates with the air outlet on the outer surface of the central tube 301. The outer surface of the movable tube 302 is provided with a sliding groove. A rectangular block is fixedly installed at the inner end of the central tube 301. The rectangular block passes through the sliding groove, so that the movable tube 302 will not rotate when it moves up and down.

[0022] A passive ring 305 is fitted on the outer surface of the central tube 301. The passive ring 305 is located below the bottom tube 103 and is fixedly installed at the bottom end of the movable tube 302. When the bottom tube 103 moves downward, it pushes the passive ring 305, causing the movable tube 302 to move downward as well, thereby driving the inner tube 206 to move in the same direction. A vent hole is provided on the lower outer surface of the central tube 301. Before the vent hole 402 is exposed, gas can be injected into the reactor 1 through the vent hole. After the bottom tube 103 moves downward, the vent hole is blocked.

[0023] Example 3: Please refer to Figure 2 , Figure 13 An anti-oxidation device suitable for molybdenum-based alloy reactors is based on embodiments 1 and 2. The outer surface of the reactor 1 is wound with a heating tube 2 for preheating inert gas. The heat emitted by the reactor 1 during operation is transferred to the heating tube 2 through the outer wall, thereby heating the inert gas flowing inside. The upper end of the sealing cover 3 is provided with an exhaust pipe 7. The input end of the exhaust pipe 7 is inserted into the interior of the reactor 1, and a spiral tube 11 is provided inside the exhaust pipe 7. The spiral tube 11 and the heating tube 2 are fixedly connected by a conductive tube 8. When the high-temperature gas inside the reactor 1 is discharged from the outlet pipe 7, it will pass through the spiral tube 11, thereby further heating it. This prevents the low-temperature inert gas from entering the reactor 1 and causing localized sudden cooling and stress cracks, which would affect the normal operating temperature inside the reactor 1 and disrupt the reaction equilibrium. A diversion cover 12 is rotatably installed on the upper end of the integrated tube 5. A heat insulation tube 6 is fixedly connected to the outer surface of the diversion cover 12. The free end of the heat insulation tube 6 is fixedly connected to the upper end of the outlet pipe 7. The diversion cover 12 is fixedly connected to the output pipe 201. The upper end of the diversion cover 12 is provided with an air outlet. The inert gas flowing out from the air outlet pipe 7 passes through the heat insulation pipe 6 and then flows out from the air outlet above the diversion cover 12. The free end of the spiral tube 11 is fixedly connected to the output pipe 201. More specifically, both the spiral tube 11 and the heat insulation pipe 6 are made of copper material with a certain degree of plasticity, which ensures the flexibility of the structure and does not interfere with the rotation function of the diversion cover 12.

[0024] The working principle of this invention is: In use, the heating device first heats the chamber inside the reactor 1. As the temperature inside the reactor 1 gradually rises, the inert gas enters the integrated tube 5 through the heated tube 2, is transferred to the moving tube 302 through the inner tube 206, and is finally injected into the reactor 1. Taking advantage of its higher density than oxygen, the inert gas rises slowly from the bottom of the reactor 1, effectively replacing the oxygen inside the reactor and creating a good inert atmosphere environment. As the internal temperature of reactor 1 gradually increases, the reaction system enters the predetermined working state. During this period, some reactants may release oxygen atoms during the thermal reaction, so inert gas needs to be continuously injected into reactor 1 to effectively replace the generated oxygen. Subsequently, the aluminum alloy material inside the heating jacket 304 melts after being heated to its melting point, and at this time it loses its adhesive force on the flow-limiting ring 403. Driven by the weight of the bottom tube 103, the heating jacket 304 moves downward, and the vent hole 402 is exposed. When the moving tube 302 moves downward, the passive rod 204 is pulled downward by the traction rod 104. At this time, the auxiliary spring 208 is compressed, and the push rod 205 is forced to move downward. The inert gas inside its vent groove 211 flows out from the vent groove on the outer surface of the output tube 201.

[0025] The vent hole on the outer surface of the central tube 301 is blocked by the downward-moving bottom tube 103. The inert gas in the movable tube 302 is released through the vent hole 402. The vent holes 402 set between multiple outer protective tubes 102 work together to exhaust gas, so that the inert gas can be filled into the reactor 1 more efficiently, thereby improving the gas filling speed and distribution uniformity. At the end of production, the diversion cover 12 is clamped with a tool and rotated. The diversion cover 12 drives the output pipe 201 to rotate, so that the output hole 212 corresponds to the air guide groove 211. At this time, the inert gas flows out from the output hole 212 and enters the air guide groove 211. As the internal pressure of the air guide groove 211 increases, the push rod 205 drives the passive rod 204 to move upward. As the passive rod 204 moves upward, it drives the bottom tube 103 to move upward through the traction rod 104. At this time, the outer protective tube 102 and the bottom tube 103 come into contact with each other and reseal the air guide hole 402. At the same time, as the heating jacket 304 moves upward, the liquid aluminum alloy inside it re-wraps the flow limiting ring 403 and naturally solidifies during the cooling process. The solidified aluminum alloy can stably fix the flow limiting ring 403, thereby preventing the outer protective tube 102 and the bottom tube 103 from sliding down under the action of gravity.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An anti-oxidation device suitable for a molybdenum-based alloy reaction kettle, comprising a reaction kettle (1), characterized in that: A sealing cover (3) is fixedly installed on the upper end of the reactor (1). An integrated pipe (5) is passed through the upper end of the sealing cover (3) for connecting to an external gas source. An isolation sleeve (101) is fixedly connected to one end of the integrated pipe (5) near the reactor (1). The isolation sleeve (101) is located below the sealing cover (3). Multiple outer protective pipes (102) are arranged below the isolation sleeve (101) in sequence by connecting rings (105). A bottom pipe (103) is connected below the bottom outer protective pipe (102) by another connecting ring (105). A multi-stage nozzle device is arranged inside the outer protective pipe (102) for spraying inert gas to achieve layered supply of reaction gas and prevent oxidation of the inner wall of the reactor (1). A temperature-controllable heating device is arranged at the bottom of the reactor (1) for heating the chamber inside the reactor (1). The multi-stage nozzle device includes a central tube (301), which passes through the interior of the outer protective tube (102). The end of the central tube (301) away from the outer protective tube (102) is fixedly connected to the isolation sleeve (101). The inner end of the central tube (301) is provided with a movable tube (302). A stabilizing sleeve (303) and a heating sleeve (304) are sequentially sleeved on the outer surface of the central tube (301). A set of stabilizing sleeves (303) and heating sleeves (304) located inside the bottom tube (103) are fixedly connected to the outer protective tube (102) and the bottom tube (103) respectively. A set of stabilizing sleeves (303) and heating sleeves (304) located at the connection of two adjacent outer protective tubes (102) are fixedly connected to the two adjacent outer protective tubes (102) respectively. A flow-limiting ring (403) is fixedly installed on the outer surface of the central tube (301). The heating sleeve (304) is filled with aluminum alloy material. When the aluminum alloy material is not melted, it wraps around the flow-limiting ring (403) and fixes it. When the aluminum alloy melts, it loses its adhesive force on the flow-limiting ring (403). Driven by the weight of the bottom tube (103), the heating sleeve (304) moves downward. The upper end of the bottom tube (103) wraps around the air guide hole (402) inside the stabilizing sleeve (303). So when the bottom tube (103) moves downward, the air guide hole (402) is exposed. Two connecting pipes (401) are fixedly installed at the inner end of the stabilizing sleeve (303), and the connecting pipes (401) are connected to the air guide hole (402). An unlocking ring (404) is fixedly connected to the upper end of the heating sleeve (304). Multiple triangular blocks (405) are fixedly installed at the upper end of the unlocking ring (404), and the triangular blocks (405) correspond to the connecting pipes (401). An air outlet plug (407) passes through the inner end of the connecting pipe (401). The outer surface of the vent plug (407) is provided with a strip-shaped hole. After the vent plug (407) moves away from the connecting pipe (401), the strip-shaped hole is located between the inside and outside of the connecting pipe (401), so that the inert gas can flow through the vent plug (407) to the outside of the connecting pipe (401). The outer surface of the vent plug (407) is fixedly connected with a snap-fit ​​plate (406), and the outer surface of the snap-fit ​​plate (406) is in contact with the inclined surface of the outer surface of the triangular block (405). A passive ring (305) is fitted on the outer surface of the central tube (301). The passive ring (305) is located below the bottom tube (103) and is fixedly installed at the bottom end of the movable tube (302). When the bottom tube (103) moves downward, it drives the connected passive ring (305) to move, thereby causing the movable tube (302) to move downward as well.

2. The anti-oxidation device suitable for the molybdenum-based alloy reaction kettle according to claim 1, characterized in that: A traction rod (104) is fixedly installed on the outer surface of the bottom tube (103). A passive rod (204) is passed through the inner end of the isolation sleeve (101). The end of the traction rod (104) away from the bottom tube (103) is fixedly connected to the outer surface of the passive rod (204). The outer protective tube (102) is connected to the bottom tube (103) through a connecting ring (105). The upper and lower ends of the connecting ring (105) are respectively sleeved on the adjacent ends of the outer protective tube (102) and the bottom tube (103). Limiting blocks are fixedly installed on the outer surfaces of the outer protective tube (102) and the bottom tube (103). The limiting blocks are located inside the connecting ring (105). The ends of two adjacent outer protective tubes (102) are connected through the connecting ring (105) and their relative movement distance is limited by the limiting blocks. An output tube (201) is provided through the inner end of the integrated tube (5). A connecting sleeve (202) is provided on the outer surface of the output tube (201). The connecting sleeve (202) is fixedly connected to the inner wall of the integrated tube (5). Two reset tubes (203) are fixedly connected to one end of the connecting sleeve (202) near the isolation sleeve (101). The reset tubes (203) and the passive rod (204) are intertwined. Air guide grooves (211) are provided inside the connecting sleeve (202) and the reset tubes (203). An output hole (212) is provided on the outer surface of the output tube (201). The output hole (212) is located inside the connecting sleeve (202). The output hole (212) on the outer surface of the output pipe (201) is intersected with the upper end of the air guide groove (211). After the output pipe (201) is rotated, the output hole (212) and the air guide groove (211) are connected to each other. The output port of the air guide groove (211) is provided with a push rod (205), and the end of the push rod (205) away from the isolation sleeve (101) is fixedly connected to the upper end of the passive rod (204). When the output hole (212) is connected to the air guide groove (211), the inert gas blown out from the output hole (212) enters the interior of the air guide groove (211). Then the pressure inside the air guide groove (211) increases, and the push rod (205) drives the passive rod (204) to move upward. A reversing rod (209) is fixedly installed inside the output pipe (201). Multiple grooves are opened on the outer surface of the reversing rod (209) to facilitate the flow of inert gas. A stopper plate (210) is rotatably installed at the bottom end of the reversing rod (209). Multiple notches are opened on the outer surface of the stopper plate (210) and correspond to the grooves on the outer surface of the reversing rod (209). An inner tube (206) is provided between the passive rod (204) and the reset pipe (203). The output pipe (201) passes through the outer surface of the inner tube (206).

3. The anti-oxidation device suitable for the molybdenum-based alloy reaction kettle according to claim 1, characterized in that: The outer surface of the reactor (1) is wound with a heating tube (2) for preheating inert gas. The upper end of the sealing cover (3) is provided with an outlet pipe (7). The inlet end of the outlet pipe (7) is inserted inside the reactor (1), and a spiral tube (11) is provided inside the outlet pipe (7). The spiral tube (11) and the heating tube (2) are fixedly connected by a connecting pipe (8).

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