Safety production device for atomizing and powdering high-temperature-resistant submerged pump pressurized melt by using microporous nozzle

Abstract

According to the safety production device for atomizing and pulverizing the high-temperature-resistant submerged pump pressurized melt through the microporous nozzle, a melt preparation and power part is composed of a smelting furnace, a melt pool and the submerged pump, a melt conveying and atomizing part is composed of a conveying pipe, a variable-diameter pressurizing pipe and a microporous nozzle atomizer, and a pressure-stabilizing safety part is composed of a pressure relief pipe, a safety floating chamber and a return pipe. A powder conveying and collecting part is composed of a powder preparing chamber, a heat exchanger, a powder collector, an air return pipe, a filter, a fan, a refrigerating machine, an air inlet pipe and a supplementary air tank. A gravity floater is installed in a safety floating chamber, after the pressure of a pressure relief pipe exceeds a set index, melt can lift the gravity floater to relieve pressure through a return pipe, and the gravity floater is reset after the pressure is normal; the device adjusts the granularity of the powder prepared by the device by adjusting the pressure of the submerged pump and the aperture of the microporous atomizing nozzle. The device solves the safety problems of overhigh pressure adjustment and continuous operation, the situation that melt is solidified in a pipeline after low temperature is generated in production is avoided, the operation of starting and stopping equipment is simple, and the particle size of powder is controllable to regulate and control.

Description

TECHNICAL FIELD

[0001] The application is a safe production device for preparing powder materials by using a high-temperature-resistant submerged pump to pressurize the molten material and using a microporous nozzle to spray the cooling into fine particles, and belongs to the technical field of powder preparation equipment. BACKGROUND

[0002] Silicon carbide, silicon nitride and other ceramic materials with very low expansion coefficient, high temperature resistance and corrosion resistance have been widely used in metal smelting processing, molten salt, chemical industry and other aspects, and have been widely used in the smelting, melting, storage and transportation of high-temperature molten materials such as preparation vessels and pipelines. The submerged ceramic pump made of silicon carbide and silicon nitride materials that can transport high-temperature molten materials is represented by the Rexroth ceramic booster pump in Germany. Since the high-temperature molten material has a high pressure, there is a huge safety hazard, and there is no suitable high-temperature-resistant valve for control, which can easily cause greater risk. It is only used for lifting and transporting molten materials with a melting point of less than 800℃ at a height of less than 1m at a lower pressure (<0.1MPa). The application number ZL202520240291.5 "A single-screw pump made of all-ceramic materials for high-temperature metal liquid transportation" has been accepted. However, high-temperature-resistant ceramic valves for temperatures above 500℃ are still missing, and direct contact with high-temperature devices can cause harm to the human body. There are still some problems to be solved in the safety of the high-temperature-resistant silicon carbide and silicon nitride ceramic pump for direct pressurized spraying and atomization of molten metal. The disclosed device, the high-temperature-resistant ceramic pump generates thermal shock when starting in the operation of the molten metal pressurization, which can easily cause thermal damage to the rear-end atomizer and other components, and requires a certain warm-up time. If the atomization end fails and the pump cannot be closed, the molten metal will flow out of the pipeline and be atomized, causing a safety hazard of high-temperature molten metal leakage. The production process requires replacing the rear-end atomization device, which also requires stopping the entire process and emptying the molten metal, resulting in a huge waste and reducing production efficiency. After shutdown, there is molten metal left in the delivery pump and pipe, which can cause the metal to solidify in the pipeline due to cooling, and needs to be emptied in time. In the case of emergency where the atomizing nozzle is blocked and the pressure continues to rise, an emergency device is needed to completely empty the high-temperature molten metal in the atomization system. These problems make it difficult to control the operation and ensure the safety of the high-temperature-resistant silicon carbide and silicon nitride ceramic pump for pressurized spraying and atomization of high-temperature molten metal to prepare powder.

[0003] CN120055273A, a device for preparing metal powder by spraying high-temperature metal liquid with a high-temperature ceramic pump, is disclosed. The material of the high-temperature ceramic pump is silicon carbide or silicon nitride. The pump body is outside the metal liquid pool. After starting the ceramic pump, the metal liquid is sucked into the pump body by the suction pipe from the metal liquid pool, and then sent into the atomizer through the feeding pipe after being pressurized. The metal liquid droplets are formed by spraying in the atomizing chamber, and the powder is prepared after cooling. By adjusting the temperature of the temperature controller before the atomizer, the viscosity of the metal liquid can be adjusted to change the particle size of the powder. By adjusting the temperature of the temperature controller, the metal liquid is cooled and solidified at this position to stop atomization. The disclosed device installs a liquid distribution and backflow pipe on the pipe after the ceramic pump is pressurized to avoid pressure build-up. The liquid distribution pipe is connected to the backflow pipe, which vertically transports the metal liquid pipe. The total height of the pipe is lower than the pressure of the ceramic pump, which can transport the homogeneous metal liquid lift. Emergency plugs are installed at the highest and lowest ends of the pipe to knock and stop the pump into the metal liquid and put the metal liquid into the emergency tank. The high-temperature ceramic pump of the disclosed device is outside the metal liquid. The metal liquid is sucked into the pump through the pipe, and then pressurized and output. The pipe is long and consumes a lot of energy, and there are many hidden dangers. During operation, the metal liquid is transported to the emergency tank and the backflow tank. The open tank body has a large heat dissipation and high energy consumption, and there are many hidden dangers. To avoid pressure build-up and blockage, the atomizer used can only be a large-diameter atomizer connected directly to the feeding pipe. Some also need to be diffused by external high-pressure gas for atomization, which cannot be directly atomized by pump pressure. The disclosed device solves the problem of pump stoppage and pressure build-up by backflow pipe, which contradicts the need to maintain a certain pressure for atomization. The method for maintaining the atomization pressure is to maintain the liquid level vertically upward by the liquid distribution pipe. In order to ensure safety, the height needs to be lower than the pressure of the ceramic pump to transport the homogeneous metal liquid lift. To increase the atomization pressure, the backflow pipe needs to be arranged vertically at a very high level. If an atomization pressure of 0.5 MPa needs to be maintained for aluminum liquid, the vertical height of the backflow pipe is 21 meters, which is difficult to operate normally. It is difficult to maintain the temperature of the high-temperature metal liquid pipe containing pressure. Once the temperature decreases and the metal liquid solidifies, there will be a huge hidden danger. After the pump is stopped, the metal liquid in the feeding pipe and the backflow pipe needs to break the emergency valve at the bottom to be cleaned out. If the heat preservation fails, the metal liquid in the pump and the pipe will solidify, making it difficult to restart.

[0004] The existing high-temperature pump atomization powder preparation technology and equipment cannot cope with the problem of blockage and pressure increase, and can only be used for large-diameter atomizers such as Laval tube atomizers, pneumatic negative pressure adsorption dispersion atomizers, and spiral nozzle atomizers. The conventional microporous nozzle atomizer cannot be used. These types of atomizers have complex structures, multiple variables for adjusting particle size, and are difficult to operate. The particle size of the powder and the pressure of the high-temperature pump do not have a linear relationship. If a microporous atomizer is used, the load at the atomization end will increase, the pressure will increase, and it will be transmitted to the high-temperature pump, which will cause damage to the pump and the motor to trip, resulting in a high-temperature metal liquid with pressure in the system, which poses a huge safety hazard. SUMMARY

[0005] The technical scheme of the present application solves the above problems, which uses a high-temperature-resistant and corrosion-resistant submersible pump as a power source. The submersible pump is a impeller submersible pump type. The impeller and the suction inlet of the pump main body are located at the lower end of the liquid in the high-temperature molten pool. Starting the submersible pump can pressurize the molten material in the molten pool and output it. The molten material passes through the conveying pipeline and enters the microporous atomizing nozzle to spray and atomize in the powder preparation chamber by using the pressure of the pump. The prepared powder is cooled and transported, collected, and packaged by circulating gas. The device of the present application is composed of four parts:

[0006] The molten material preparation and power part is composed of a melting furnace (1), a molten pool (2), and a submersible pump (3). The submersible pump (3) is placed in the molten pool (2). The impeller and the suction inlet of the pump are located at the lower end of the liquid in the molten pool, and the outlet is higher than the molten pool. The melting furnace and the molten pool can be connected or separated. The submersible pump is made of high-temperature-resistant, corrosion-resistant, and high-thermal-conductivity silicon carbide, silicon nitride ceramic material or metal material.

[0007] The molten material conveying and atomizing part is composed of a conveying pipeline (4), a variable-diameter pressure boosting pipeline (5), and a microporous atomizing nozzle (6). The materials of the conveying pipeline and the variable-diameter pressure boosting pipeline are high-temperature-resistant, corrosion-resistant, and high-thermal-conductivity ceramic material or metal material. The outside has a heat preservation layer, and the heat preservation temperature is set to be above the melting point of the molten material. The conveying pipeline is a horizontal straight pipe, one end of which is connected to the outlet of the submersible pump, and the other end is connected to the variable-diameter pressure boosting pipeline. The variable-diameter pressure boosting pipeline is a straight pipe or a bent pipe. The pipe diameter becomes smaller from one end of the conveying pipeline to the microporous atomizing nozzle, which increases the pressure of the molten material before the microporous atomizing nozzle and improves the fineness of the powder. The bent pipe of the variable-diameter pressure boosting pipeline changes the direction of the microporous atomizing nozzle.

[0008] The stable pressure safety part is composed of a pressure relief pipe (8), a safety float chamber (9), a gravity float (10), and a backflow pipe (11). The materials of the pressure relief pipe, the safety float chamber, and the backflow pipe are ceramic or metal materials with high temperature resistance, corrosion resistance, and high thermal conductivity. The outside has a heat preservation layer, and the heat preservation temperature is set to be higher than the melting point of the molten material. The pressure relief pipe is vertically connected with the feeding pipe above the middle of the feeding pipe, and the pipe diameter is consistent with the feeding pipe. The internal molten material pressure is the same as the internal pressure of the feeding pipe. The upper part of the pressure relief pipe is provided with the safety float chamber. The safety float chamber is a circular tube with a circular opening at the top and a backflow pipe connected horizontally at the side. The inner diameter of the backflow pipe is consistent with the inner diameter of the safety float chamber. The outlet pipe is at the upper end of the molten material pool and above the molten material surface. The bottom of the safety float chamber is connected with the pressure relief pipe, and the inner diameter is larger than the inner diameter of the pressure relief pipe. The safety float chamber is provided with the gravity float. The gravity float is made of metal and wrapped with silicon carbide, silicon nitride, or graphite material with high temperature resistance, corrosion resistance, high thermal conductivity, heat resistance, and low friction. The middle of the gravity float is a cylinder, and the upper and lower ends are conical. The diameter of the cylindrical part is larger than the pressure relief pipe and slightly smaller than the inner diameter of the safety float chamber, so it can move up and down in the safety float chamber. The length is larger than the diameter of the backflow pipe. The lower conical section of the gravity float extends into the pressure relief pipe and presses the upper opening of the pressure relief pipe. When the pressure of the pressure relief pipe is too high, the molten material in the pressure relief pipe pressurizes and lifts the gravity float to expose the backflow pipe. The molten material flows to the molten material pool through the backflow pipe. When the pressure of the pressure relief pipe returns to normal, the gravity float falls back to its original position and presses the upper opening of the pressure relief pipe, interrupting the molten material from entering the backflow pipe. The weight of the gravity float is set according to the safety pressure of the feeding pipe, the variable-diameter pressurizing pipe, and the atomization operation. When the safety pressure is exceeded, the molten material in the pressure relief pipe can lift the gravity float. When the gravity float rises, the upper conical section extends and is clamped in the circular opening at the top of the safety float chamber. The diameter of the circular opening at the top of the safety float chamber is smaller than 1 / 5 of the diameter of the cylindrical part of the gravity float.

[0009] The powder making, conveying, and collecting part is composed of a powder making chamber (7), a heat exchanger (12), a powder collector (13), a back gas pipe (14), a filter (15), a fan (16), a refrigeration machine (17), and an air supplement tank (19). The fan sends the gas into the powder making chamber through the air inlet pipe. The air inlet pipe is provided with the refrigeration machine to cool the gas to the required temperature. The low-temperature gas in the powder making chamber cools the atomized molten material into solid powder. The powder is conveyed by the gas, cooled by the heat exchanger, and then collected and packaged in the powder collector. The gas without the powder is returned to the fan through the back gas pipe, and the fan sends the gas into the powder making chamber through the air inlet pipe for recycling. The back gas pipe is provided with the filter to remove the residual powder. The fan is connected with the air supplement tank to supplement the circulating loss of the gas. The refrigeration and circulating conveying gas does not react with the molten material.

[0010] The operation of the device of the present application is as follows: in the first step, the melting temperature of the furnace and the temperature of the molten pool are set, the material to be melted is heated to liquid in the furnace, and then put into the molten pool; and the temperature of each part is confirmed to be above the melting point of the molten material. In the second step, the air volume of the fan, the refrigeration temperature of the refrigeration machine for the gas, and the safe temperature of the heat exchanger for the gas and the powder after heat exchange are set, and the fan, the refrigeration machine, and the heat exchanger are started to circulate the gas in the equipment and pipeline for powder collection. In the third step, the submersible pump is started to pressurize the molten material from the molten pool to the material conveying pipe and the variable-diameter pressure-increasing pipe, and then sprayed to the powdering chamber through the microporous atomizing nozzle to be cooled into powder by the low-temperature gas, and then transported to the heat exchanger to reduce the temperature to a safe temperature, and then sent to the powder collector for collection and packaging, and the separated gas is returned to the fan through the gas return pipe for recycling. By adjusting the pressure of the submersible pump and the pore size of the microporous atomizing nozzle, the particle size of the powder prepared by the device can be adjusted.

[0011] Compared with the conventional molten material atomization powder preparation method, the molten material can flow back along the material conveying pipe to the molten pool through the submersible pump after the submersible pump is stopped, and does not remain in the pipeline, so that the problem of solidification in the pipeline after low temperature is solved, the operation of starting and stopping the equipment is simple, the particle size of the powder can be controlled, the safety problem of continuous operation caused by excessive pressure is solved, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] ATTACHMENT Figure 1 Device configuration schematic diagram

[0013] Specific application examples

[0014] Example 1: Device for producing magnesium powder by submersible pump pressurization and microporous nozzle atomization

[0015] 1. Melting magnesium and power part. The raw material is magnesium. The furnace is a magnesium melting furnace, and the molten pool is a magnesium liquid pool. The set working temperature of the magnesium melting furnace and the magnesium liquid pool is 720℃; the submersible pump is made of silicon nitride ceramic material, and the set working temperature is 720℃ and the working pressure is 1MPa. The submersible pump is placed in the magnesium liquid pool.

[0016] 2. Conveying magnesium liquid and atomization part. The material conveying pipe and the variable-diameter pressure-increasing pipe are made of silicon nitride ceramic material, and can withstand 1.6MPa pressure. The outside has a heat preservation layer, and the heat preservation requirement is that the temperature of the magnesium liquid in the pipe is greater than 700℃; the microporous atomizing nozzle is made of nickel-chromium alloy material, and can withstand 1.6MPa pressure. The material conveying pipe, the variable-diameter pressure-increasing pipe, and the microporous atomizing nozzle are horizontally connected and placed, and the microporous atomizing nozzle horizontally extends into the powdering chamber.

[0017] 3. Stable pressure safety part. The pressure relief pipe, safety float chamber, and return pipe are made of silicon nitride ceramic material, and the outside has a heat preservation layer. The temperature of the magnesium liquid in the pipe should be greater than 660°C. The pressure relief pipe is connected to the feed pipe vertically above the middle of the feed pipe, and the pipe diameter is the same as that of the feed pipe. A safety float chamber is installed on the upper part of the pressure relief pipe. The safety float chamber is horizontally connected to a return pipe, and the outlet of the return pipe is above the surface of the magnesium liquid in the magnesium liquid pool. The gravity float in the safety float chamber is made of steel wrapped in silicon nitride ceramic, with a cylindrical middle part and conical upper and lower ends. The diameter of the cylindrical part is greater than that of the pressure relief pipe and slightly smaller than the inner diameter of the safety float chamber, and the length is greater than the diameter of the return pipe. The conical segment at the lower part of the gravity float extends into the interior of the pressure relief pipe and presses the upper opening of the pressure relief pipe. The diameter of the circular opening at the top of the safety float chamber is less than 1 / 5 of the diameter of the cylindrical part of the gravity float. The weight of the gravity float is set to lift the gravity float when the pressure of the magnesium liquid in the pressure relief pipe reaches 1.01 MPa.

[0018] 4. Powder making, conveying, and collecting part. The powder making chamber, heat exchanger, powder collector, gas return pipe, filter, fan, refrigeration machine, gas inlet pipe, and supplementary gas tank constitute the magnesium powder making, conveying, and collecting part. The microporous atomizing nozzle horizontally extends into the powder making chamber, and the gas inlet pipe inputs gas from the upper part into the powder making chamber. The gas is argon, which does not react with the magnesium liquid. The refrigeration machine is set to cool the argon to <2°C, and the heat exchanger cools the argon and magnesium powder to <45°C.

[0019] 5. Operation device for making magnesium powder. In the first step, the metal magnesium is melted into a liquid in the molten magnesium furnace and poured into the magnesium liquid pool, and the temperature in the molten magnesium furnace and the magnesium liquid pool is maintained at 720°C. In the second step, the fan, refrigeration machine, and heat exchanger are started to make the argon circulate in the powder making and collecting equipment and pipelines. In the third step, the submersible pump is started to pressurize the magnesium liquid from the molten magnesium pool and convey it to the feed pipe and the variable-diameter pressure-increasing pipe, and the magnesium liquid is sprayed through the microporous atomizing nozzle into the powder making chamber, cooled into powder by the low-temperature argon, conveyed by the argon to the heat exchanger, cooled to <45°C, and then enters the powder collector to be discharged and packaged. The argon circulates back to the fan for continuous cooling and then enters the powder making chamber. The argon loss is supplemented by the supplementary gas tank.

[0020] 6. When the pressure in the pressure relief pipe exceeds 1.01 MPa, the magnesium liquid in the pressure relief pipe lifts the gravity float of the safety float chamber to expose the return pipe, the magnesium liquid flows back to the magnesium liquid pool through the return pipe, and when the pressure in the pressure relief pipe returns to normal, the gravity float falls and presses on the upper opening of the pressure relief pipe, interrupting the magnesium liquid from entering the return pipe. By changing the pressure of the submersible pump and the pore size of the microporous atomizing nozzle, the particle size of the magnesium powder produced by the device can be adjusted.

[0021] Example 2: Device for producing mixed salt powder refining agent by submersible pump pressurization and microporous nozzle atomization

[0022] 1. Molten salt and power part. The raw material is a mixture of sodium chloride, zinc nitrate and sodium nitrate, the melting furnace is a molten salt furnace, the molten pool is a molten salt pool, the set working temperature of the molten salt furnace and the molten salt pool is 820 ℃, the under-liquid pump is made of silicon nitride-silicon carbide composite ceramic material, the set working temperature is 820 ℃, and the set working pressure is 0.3 MPa. The under-liquid pump is placed in the molten salt pool.

[0023] 2. Liquid molten salt conveying and atomizing part. The feed pipe, variable-diameter booster pipe and microporous atomizing nozzle are all made of silicon nitride ceramic material, can bear pressure of 0.6 MPa, have an external heat preservation layer, and the heat preservation requires that the temperature of the molten salt in the pipe be greater than 810 ℃; the feed pipe is horizontally placed to connect the variable-diameter booster pipe, the variable-diameter booster pipe is a horizontally bent pipe downward by 90 ℃, and the microporous atomizing nozzle vertically downward extends into the powder making chamber.

[0024] 3. Pressure stabilizing and safety part. The pressure relief pipe, safety float chamber and backflow pipe are made of silicon nitride-silicon carbide composite ceramic material, have an external heat preservation layer, and the heat preservation requires that the temperature of the molten salt in the pipe be greater than 810 ℃. The pressure relief pipe is vertically connected with the feed pipe above the middle section of the feed pipe and has the same diameter as the feed pipe; the safety float chamber is horizontally connected with the backflow pipe, and the outlet of the backflow pipe is above the molten salt liquid level of the molten salt pool. The gravity float in the safety float chamber is an aluminum graphite package, which has a cylindrical middle part and conical upper and lower ends; the diameter of the cylindrical part is greater than that of the pressure relief pipe and slightly smaller than the inner diameter of the safety float chamber, and the length is greater than the diameter of the backflow pipe; the lower conical section of the gravity float extends into the pressure relief pipe and presses the upper opening of the pressure relief pipe. The diameter of the circular opening at the top of the safety float chamber is less than 1 / 5 of the diameter of the cylindrical part of the gravity float. The weight of the gravity float is set to be lifted by the molten salt in the pressure relief pipe reaching a pressure of 0.305 MPa.

[0025] 4. Powder making, conveying and collecting part. The powder making chamber, heat exchanger, powder collector, air return pipe, filter, fan, refrigerator, air inlet pipe and supplementary gas tank constitute the fine refining agent conveying and collecting part. The microporous atomizing nozzle vertically downward extends into the powder making chamber, and the air inlet pipe horizontally inputs gas into the powder making chamber from the side; the gas is nitrogen which does not react with the molten salt; the refrigerator is set to cool the nitrogen to <1 ℃, and the heat exchanger is set to cool the nitrogen and the fine refining agent to <30 ℃.

[0026] 5. Operating device and powder making. In the first step, the mixture of sodium chloride, zinc nitrate and sodium nitrate is melted into liquid in the molten salt furnace and poured into the molten salt pool, and the temperature in the molten salt furnace and the molten salt pool is kept at 820 ℃. In the second step, the fan, refrigerator and heat exchanger are started to make the nitrogen circulate in the powder making and collecting equipment and pipelines. In the third step, the under-liquid pump is started to pressurize the molten salt from the molten salt pool and convey it to the feed pipe, variable-diameter booster pipe and microporous atomizing nozzle, and the molten salt is sprayed into the powder making chamber by the microporous atomizing nozzle, cooled into powder by the low-temperature nitrogen, conveyed to the heat exchanger by the nitrogen, cooled to <30 ℃, and then put into the powder collector to be discharged and packaged, and the nitrogen is circulated back to the fan to continue cooling and then enters the powder making chamber. The nitrogen loss is supplemented by the supplementary gas tank.

[0027] 6、When the pressure of the pressure relief pipe exceeds 0.305 MPa, the molten salt in the pressure relief pipe lifts the gravity float of the safety float chamber to expose the return pipe, the molten salt flows back to the molten salt pool through the return pipe, and after the pressure of the pressure relief pipe returns to normal, the gravity float falls and presses on the upper opening of the pressure relief pipe to interrupt the molten salt from entering the return pipe. By changing the pressure of the submerged pump and the pore diameter of the microporous atomizing nozzle, the particle size of the powder refining agent prepared by the device can be adjusted.

Claims

1. A safe production device for atomizing and pulverizing molten material using a micro-orifice nozzle under pressure from a high-temperature submersible pump, characterized in that: The device is composed of a molten preparation and power part, a molten delivery and atomization part, a stable pressure safety part, and a powder preparation, delivery and collection part. The molten preparation and power part has a melting furnace, a molten pool and a submerged pump. The molten delivery and atomization part has a delivery pipe, a variable-diameter pressure boosting pipe and a micro-porous atomization nozzle. The stable pressure safety part has a pressure relief pipe, a backflow pipe and a safety float chamber with a gravity float. The powder preparation, delivery and collection part has a powder preparation chamber, a heat exchanger, a powder collector, a gas return pipe, a filter, a fan, a refrigeration machine, an air inlet pipe and a supplementary gas tank.

2. The safe production device for atomizing and powdering high-temperature resistant submersible pump pressurized melt according to claim 1, characterized in that The submerged pump is placed in the molten pool, with the impeller and suction inlet of the pump being below the liquid level in the molten pool and the outlet being above the molten pool.

3. The safe production device for atomizing and powdering high-temperature resistant submersible pump pressurized melt according to claim 1, characterized in that The delivery pipe is a straight pipe horizontally placed, with one end connected to the outlet of the submerged pump and the other end connected to the variable-diameter pressure boosting pipe. The variable-diameter pressure boosting pipe is a straight pipe or a bent pipe, with the pipe diameter becoming smaller from the end connected to the delivery pipe to the end connected to the micro-porous atomization nozzle. The bent pipe of the variable-diameter pressure boosting pipe changes the direction of the micro-porous atomization nozzle.

4. The safe production device for atomizing and powdering high-temperature resistant submersible pump pressurized melt according to claim 1, characterized in that The pressure relief pipe is vertically connected to the delivery pipe above the middle section of the delivery pipe, with the pipe diameter being the same as that of the delivery pipe. The pressure relief pipe is connected to a circular pipe-shaped safety float chamber at the upper part, with the inner diameter of the safety float chamber being larger than that of the pressure relief pipe and the side surface being horizontally connected to a backflow pipe. The inner diameter of the backflow pipe is the same as that of the safety float chamber, and the outlet of the backflow pipe is above the upper end of the molten pool and above the liquid level of the molten pool.

5. The safe production device for atomizing and powdering high-temperature resistant submersible pump pressurized melt according to claim 1, characterized in that The gravity float is placed in the safety float chamber, which is made of metal and wrapped with silicon carbide, silicon nitride or graphite material that is resistant to high temperature, corrosion, high thermal conductivity, heat shock and low friction. The gravity float is cylindrical in the middle and conical at the top and bottom. The diameter of the cylindrical part is larger than that of the pressure relief pipe and slightly smaller than the inner diameter of the safety float chamber, and the length is larger than the diameter of the backflow pipe. The weight of the gravity float is set according to the safe pressure of the delivery pipe, variable-diameter pressure boosting pipe and atomization operation. When the pressure exceeds the safe pressure, the molten material in the pressure relief pipe can lift the gravity float. When the pressure in the pressure relief pipe is too high, the molten material lifts the gravity float to expose the backflow pipe, and the molten material flows into the molten pool through the backflow pipe. When the pressure in the pressure relief pipe returns to normal, the gravity float falls back to the upper opening of the pressure relief pipe, interrupting the molten material from entering the backflow pipe.

6. The safe production device for atomizing and powdering high-temperature resistant submersible pump pressurized melt according to claim 1, characterized in that The materials of the delivery pipe, variable-diameter pressure boosting pipe, pressure relief pipe, safety float chamber and backflow pipe are ceramic or metal materials that are resistant to high temperature, corrosion and high thermal conductivity, and are wrapped with a heat preservation layer with a temperature set above the melting point of the molten material.

7. The safe production device for atomizing and powdering high-temperature resistant submersible pump pressurized melt according to claim 1, characterized in that The particle size of the powder prepared by the device can be adjusted by adjusting the pressure of the submerged pump and the pore size of the micro-porous atomization nozzle.

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