A supersonic flame spraying device for turbine last stage blades

Abstract

The utility model relates to steam turbine blade surface treatment technical field discloses a steam turbine last stage blade supersonic flame spraying device, including combustion chamber, the left end intercommunication connection of combustion chamber has acceleration pipe, the left end intercommunication connection of acceleration pipe has nozzle, the bottom of combustion chamber is provided with cooling mechanism, the right side top of combustion chamber is provided with stirring preheating mechanism, the cooling mechanism includes cooling water tank, cooling water tank sets up at the bottom of combustion chamber, the top intercommunication connection of cooling water tank has the liquid outlet pipe, the inner wall equidistance fixed connection of liquid outlet pipe has a plurality of mounting rings. In the utility model, the cooling liquid helical flow under the circulation drive, through the spiral pipe surrounds the heat absorption of acceleration pipe and circulates cooling, the fin and the heat pipe auxiliary heat dissipation, reduce the acceleration pipe temperature, avoid the deformation of acceleration pipe, ensure that the powder injection stability, promote the coating thickness uniformity, strengthen the combination strength of blade and coating.

Description

Technical Field

[0001] This utility model relates to the field of surface treatment technology for steam turbine blades, and in particular to a supersonic flame spraying device for the last stage blades of a steam turbine. Background Technology

[0002] The supersonic flame spraying device for the last stage blades of steam turbines is a thermal spraying equipment specifically designed for the last stage blades of steam turbines. The last stage blades of steam turbines operate under harsh conditions of high temperature, high pressure, high humidity and high-speed steam impact, which places high demands on their surface performance. This device controls the spraying parameters to uniformly spray suitable coating materials onto the surface of the last stage blades to enhance the blades' erosion resistance and corrosion resistance, ensuring the efficient and stable operation of the steam turbine.

[0003] A search revealed Chinese Patent Publication No. CN220329063U, which discloses a spraying device for enhancing the performance of aerospace blades. The device includes a base, a sliding box at the top of the base, a sliding assembly within the sliding box, a fixed box fixedly mounted on the top of the sliding assembly extending to the top of the sliding box, and a lifting assembly within the fixed box. A mounting plate is fixedly mounted on the front end of the lifting assembly extending to the front end of the fixed box, and a spray gun is fixedly mounted on the front end of the mounting plate. This spraying device for enhancing the performance of aerospace blades, through the combined action of the sliding assembly and the lifting assembly, allows for adjustment of the spray gun's position, thus replacing manual hand-held operation. The purpose of this invention is to solve the problem that existing high-pressure flame spraying devices require users to hold them for extended periods during actual use, leading to frequent arm pain. However, during supersonic flame spraying of turbine last-stage blades, the high-temperature flame generated by the spray gun accelerates the powder spraying within the acceleration tube. This process generates a large amount of heat. As the spraying operation continues for a long time, the temperature of the acceleration tube will exceed the safe range that its material can withstand, causing deformation of the channel within the acceleration tube, reducing the stability of powder spraying, resulting in uneven coating thickness, increased coating porosity, reduced bonding strength between the coating and the blade, and shortened blade lifespan. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a supersonic flame spraying device for the last stage blades of a steam turbine, which aims to improve the problem in the prior art where the high-temperature flame generated by the spray gun accelerates the spraying of powder in the acceleration tube, and the channel inside the acceleration tube will deform as the spraying work continues for a long time.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a supersonic flame spraying device for the last stage blades of a steam turbine, comprising a combustion chamber, an acceleration tube connected to the left end of the combustion chamber, a nozzle connected to the left end of the acceleration tube, a cooling mechanism at the bottom of the combustion chamber, and a stirring and preheating mechanism at the top right side of the combustion chamber. The cooling mechanism includes a cooling water tank located at the bottom of the combustion chamber. A liquid outlet pipe is connected to the top of the cooling water tank. Multiple mounting rings are fixedly connected at equal intervals to the inner wall of the liquid outlet pipe. Corresponding rotating shafts are rotatably connected to the inner walls of each mounting ring. Spiral guide vanes are fixedly connected to the outer walls of each rotating shaft. A guide cone is fixedly connected to the right end of each rotating shaft. A spiral winding tube is connected to the top of the liquid outlet pipe. The outer wall of the spiral winding tube is fixedly connected to the inner wall of the acceleration tube. A return water pipe is connected to the bottom of the spiral winding tube. The bottom end of the return water pipe is connected to the top left side of the cooling water tank. A circulation pump is fixedly connected to the bottom of the return water pipe. A heat dissipation assembly is located on the outer side of the acceleration tube. A powder feeding assembly is located on the right side of the combustion chamber.

[0006] The above technical solution involves a cooling water tank storing coolant, and an installation ring, rotating shaft, spiral guide vanes, and guide cone inside the outlet pipe working together to guide the coolant in a spiral flow, increasing the contact area and time with the acceleration tube, enhancing heat exchange, and a spiral winding tube tightly surrounding the inner wall of the acceleration tube for efficient heat absorption. The return water pipe and circulation pump enable coolant circulation, and the heat dissipation components assist in heat dissipation, effectively preventing the acceleration tube from overheating and deforming, ensuring stable operation of the spraying device, and extending the service life of the equipment.

[0007] As a further description of the above technical solution: The stirring and preheating mechanism includes a stirring shaft, which is located on the top right side of the combustion chamber. A stirring paddle is fixedly connected to the bottom of the outer wall of the stirring shaft, a spiral propeller is fixedly connected to the bottom end of the stirring shaft, a preheating pipe is provided on the outer side of the stirring shaft, and a drive assembly is provided at the top end of the stirring shaft.

[0008] Through the above technical solution: the stirring shaft drives the bottom stirring paddle to fully stir the powder, making it evenly mixed and avoiding the impact of uneven powder on the coating quality. The screw propeller pushes the mixed powder to a suitable position for easy subsequent transportation. The outer preheating pipe preheats the powder, improving its melting efficiency in the combustion chamber. The drive component provides power to the stirring shaft, ensuring that all components work together stably.

[0009] As a further description of the above technical solution: The heat dissipation assembly includes a heat sink group, the inner wall of which is fixedly connected to the outer wall of the acceleration tube, and heat conduction pipes are fixedly connected at equal intervals around the inner wall of the heat sink group.

[0010] Through the above technical solutions: the heat sink assembly increases the heat dissipation area of ​​the accelerating tube, closely fits the outer wall of the accelerating tube for efficient heat dissipation, the heat conduction tube accelerates heat conduction, assists the accelerating tube in rapid heat dissipation, effectively prevents overheating and deformation, and ensures stable operation of the spraying device.

[0011] As a further description of the above technical solution: The powder feeding assembly includes a powder feeding pipe, the left end of which is connected to the right side of the combustion chamber. A rotating shaft is provided inside the powder feeding pipe, and a spiral powder feeding blade is fixedly connected to the outer wall of the rotating shaft. A powder feeding motor is fixedly connected to the right end of the powder feeding pipe, and the output end of the powder feeding motor is fixedly connected to the right end of the rotating shaft. A powder storage tank is connected to the top right side of the powder feeding pipe through a pipe. The stirring shaft is located inside the powder storage tank, and a control assembly is provided outside the combustion chamber.

[0012] The above technical solution involves a powder-feeding motor driving a rotating shaft and a spiral powder-feeding blade to stably transport powder from the powder storage tank to the combustion chamber, ensuring a continuous supply of coating materials. The stirring shaft stirs the powder in the storage tank, making the powder mix more uniform and improving the coating quality. The control components monitor the process in real time and can adjust the powder feeding process according to the actual situation, ensuring the stable operation of the entire spraying process.

[0013] As a further description of the above technical solution: The control component includes a temperature sensor, the bottom of which is fixedly connected to the top left side of the combustion chamber. A pressure sensor is fixedly connected to the top right side of the combustion chamber. A temperature sensor is fixedly connected to the front left end of the acceleration tube. A pressure sensor is fixedly connected to the front right end of the acceleration tube. A controller is fixedly connected to the front side of the powder storage tank.

[0014] The above technical solution involves real-time monitoring of the combustion chamber temperature and pressure using temperature sensor 1 and pressure sensor 1, and monitoring of the accelerator tube temperature and pressure using temperature sensor 2 and pressure sensor 2. Based on this data, the controller adjusts the equipment operating parameters to ensure stable operation of the combustion chamber and accelerator tube, guaranteeing a smooth spraying process and improving coating quality and spraying efficiency.

[0015] As a further description of the above technical solution: The drive assembly includes a mounting base, the bottom of which is fixedly connected to the top of the powder storage tank. A stirring motor is fixedly connected to the top of the inner wall of the mounting base. A reduction motor is fixedly connected to the output end of the stirring motor. The output end of the reduction motor is fixedly connected to the top end of the stirring shaft.

[0016] The above technical solution provides a stable connection between the mounting base and the powder storage tank, supports the stirring motor and the reduction motor, provides power to the stirring motor, and adjusts the speed of the reduction motor to ensure that the stirring shaft operates at a suitable speed, thus ensuring the stable operation of the stirring and preheating mechanism and improving the powder processing effect.

[0017] As a further description of the above technical solution: A sealing ring is fixedly connected to the left side of the outer wall of the powder feeding pipe, and the left side of the sealing ring is fixedly connected to the right side of the combustion chamber.

[0018] The above technical solution, with its sealing ring between the powder feeding pipe and the combustion chamber, effectively enhances the sealing of the connection between the two, prevents powder leakage during the powder feeding process, and maintains a clean working environment.

[0019] As a further description of the above technical solution: A rotating disk is fixedly connected to the upper part of the outer wall of the stirring shaft, and dispersing blades are fixedly connected to the outer walls of the rotating disk.

[0020] The above technical solution involves a rotating disc and its surrounding dispersing blades. When the stirring shaft rotates, the dispersing blades rotate, which disperses the powder in the powder storage tank, making the powder distribution more uniform and thus effectively improving the quality and uniformity of the subsequent spray coating.

[0021] This utility model has the following beneficial effects: 1. In this utility model, the powder is fed through a powder feeding pipe. In the combustion chamber, the fuel and oxygen burn to melt the powder, which is then accelerated and sprayed out from the nozzle to form a coating. The sensor monitors the data, and the controller adjusts the fuel and oxygen ratio to maintain stability. The coolant flows spirally under the driving circulation, and absorbs heat and circulates around the acceleration tube through the spiral tube for cooling. The heat sink and heat conduction pipe assist in heat dissipation, reduce the temperature of the acceleration tube, prevent the acceleration tube from deforming, ensure stable powder spraying, improve the uniformity of coating thickness, and enhance the bonding strength between the blade and the coating.

[0022] 2. In this utility model, the mounting base is fixed on the top of the powder storage tank to support the drive assembly. When the stirring motor is started, the stirring shaft is driven to rotate after the speed is adjusted by the reduction motor. The stirring paddle rotates to fully mix the different powders in the tank, avoiding the coating quality from being affected by uneven mixing. The screw propeller rotates synchronously to push the mixed powder to the bottom. The preheating pipe surrounding the stirring shaft preheats the powder through electric heating, so that the powder can melt faster after entering the combustion chamber, improving melting efficiency and ensuring coating quality and performance. Attached Figure Description

[0023] Figure 1 This is a perspective view of a supersonic flame spraying device for the last stage blades of a steam turbine proposed in this utility model; Figure 2This is a front view of a supersonic flame spraying device for the last stage blades of a steam turbine, as proposed in this utility model. Figure 3 This is a schematic diagram of the heat dissipation component structure of a supersonic flame spraying device for the last stage blades of a steam turbine, as proposed in this utility model. Figure 4 This is a cross-sectional view of the powder storage tank structure of a supersonic flame spraying device for the last stage blades of a steam turbine, as proposed in this utility model. Figure 5 This is a schematic diagram of the cooling mechanism of a supersonic flame spraying device for the last stage blades of a steam turbine, as proposed in this utility model. Figure 6 This is a schematic diagram of the cooling water tank structure of a supersonic flame spraying device for the last stage blades of a steam turbine, as proposed in this utility model. Figure 7 This is a structurally exploded view of the powder feeding assembly of a supersonic flame spraying device for the last stage blades of a steam turbine, as proposed in this utility model.

[0024] Explanation of reference numerals in the attached figures: 1. Combustion chamber; 2. Cooling mechanism; 201. Cooling water tank; 202. Liquid outlet pipe; 203. Spiral wound pipe; 204. Return water pipe; 205. Circulating pump; 206. Mounting ring; 207. Rotating shaft; 208. Spiral guide vane; 209. Guide cone; 210. Heat dissipation assembly; 2101. Heat dissipation fin assembly; 2102. Heat conduction pipe; 211. Powder feeding assembly; 2111. Powder feeding pipe; 2112. Rotating shaft; 2113. Spiral powder feeding blade; 2114. Powder feeding motor; 2115. Powder storage tank; 2 12. Control components; 2121. Temperature sensor 1; 2122. Pressure sensor 1; 2123. Temperature sensor 2; 2124. Pressure sensor 2; 2125. Controller; 3. Stirring and preheating mechanism; 301. Stirring shaft; 302. Stirring paddle; 303. Screw propeller; 304. Preheating tube; 305. Drive components; 3051. Mounting base; 3052. Stirring motor; 3053. Gear motor; 4. Acceleration tube; 5. Nozzle; 6. Sealing ring; 7. Rotating disk; 8. Dispersion blades. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figure 1 , Figure 5 and Figure 6The present invention provides an embodiment of a supersonic flame spraying device for the last stage blades of a steam turbine, comprising a combustion chamber 1, which serves as the core area of ​​the spraying device and provides space for the mixing and combustion of fuel and oxygen, thereby generating a high-temperature and high-speed airflow to accelerate and melt the powder. The left end of the combustion chamber 1 is connected to an acceleration pipe 4, which can further accelerate the molten powder particles coming out of the combustion chamber 1 to form a supersonic jet. The left end of the acceleration pipe 4 is connected to a nozzle 5, which sprays the accelerated powder at high speed, causing it to impact the surface of the last stage blades of the steam turbine to form a coating. A cooling mechanism 2 is installed at the bottom of the combustion chamber 1. This mechanism reduces the heat generated by the combustion chamber 1 and related components during operation, ensuring stable operation of the device. A stirring and preheating mechanism 3 is installed at the top right side of the combustion chamber 1. This mechanism stirs, mixes, and preheats the powder entering the combustion chamber 1, improving powder melting efficiency and coating quality. The cooling mechanism 2 includes a cooling water tank 201, which stores coolant and provides a cooling medium for the cooling system. The cooling water tank 201 is located at the bottom of the combustion chamber 1; this layout facilitates gravity-assisted coolant circulation. An outlet pipe 202 is connected to the top of the cooling water tank 201, leading the coolant from the tank to the areas requiring cooling. Multiple mounting rings 206 are fixedly connected at equal intervals to the inner wall of the 207. The mounting rings 206 provide support for the rotating shaft 207 to ensure its stable rotation. The inner walls of the multiple mounting rings 206 are respectively rotatably connected to the corresponding rotating shafts 207. The rotating shafts 207 rotate within the mounting rings 206, driving the spiral guide vanes 208 and guide cones 209 to rotate together. The outer walls of the multiple rotating shafts 207 are fixedly connected to the spiral guide vanes 208. The spiral guide vanes 208 rotate under the impact of the coolant flow, guiding the coolant to form a spiral flow, increasing the contact area and time between the coolant and the inner wall of the pipe, and enhancing the cooling effect. The right ends of the multiple rotating shafts 207 are all fixedly connected to the guide cones 209. The guide cones 209 further optimize the flow direction of the coolant, making it more effectively enter the spiral winding tube 203. The top end of the outlet pipe 202 is connected to a spiral wound pipe 203, which tightly wraps around the inner wall of the acceleration pipe 4. The spiral wound pipe 203 absorbs the heat generated during the operation of the acceleration pipe 4 through heat exchange. The outer wall of the spiral wound pipe 203 is fixedly connected to the inner wall of the acceleration pipe 4 to ensure uniform cooling. The bottom end of the spiral wound pipe 203 is connected to a return water pipe 204, which returns the cooled liquid after heat absorption to the cooling water tank 201. The bottom end of the return water pipe 204 is connected to the top left side of the cooling water tank 201, thus realizing the circulation of the coolant. The bottom of the return water pipe 204 is fixedly connected to a circulation pump 205, which provides power for the circulation of coolant and ensures continuous flow of coolant. The bottom of the circulation pump 205 is fixedly connected to the top of the combustion chamber 1 for easy installation and connection of pipes. A heat dissipation component 210 is provided on the outside of the acceleration pipe 4. The heat dissipation component 210 assists the acceleration pipe 4 in dissipating heat, further reducing its temperature and preventing overheating and deformation. A powder feeding component 211 is provided on the right side of the combustion chamber 1. The powder feeding component 211 is responsible for conveying the powder in the powder storage tank 2115 to the combustion chamber 1 to provide raw materials for the spraying operation. Specifically, the cooling water tank 201 stores coolant. The mounting ring 206, rotating shaft 207, spiral guide vane 208, and guide cone 209 inside the outlet pipe 202 work together to guide the coolant to flow spirally, enhancing heat exchange. The spiral winding tube 203 tightly surrounds the inner wall of the acceleration tube 4 to absorb heat. The return water pipe 204 and the circulation pump 205 realize the circulation of coolant. The heat dissipation component 210 assists in heat dissipation, effectively preventing the acceleration tube 4 from overheating and deforming, ensuring the stable operation of the spraying device, and extending the service life of the equipment.

[0027] Reference Figure 1 , Figure 3 and Figure 7The heat dissipation assembly 210 includes a heat sink assembly 2101, which increases the heat dissipation area and effectively dissipates the heat generated by the acceleration tube 4. The inner wall of the heat sink assembly 2101 is fixedly connected to the outer wall of the acceleration tube 4 to ensure close contact between the heat sink assembly 2101 and the acceleration tube 4, thereby improving heat dissipation efficiency. Heat-conducting pipes 2102 are fixedly connected at equal intervals around the inner wall of the heat sink assembly 2101. The heat-conducting pipes 2102 can conduct heat more efficiently and accelerate the heat dissipation speed. The powder feeding assembly 211 includes a powder feeding pipe 2111, which is used to transport powder from the powder storage tank 2115 to the combustion chamber 1. The left end of the powder feeding pipe 2111 is connected to the right side of the combustion chamber 1 to realize the transport of powder to the combustion chamber 1. A rotating shaft 2112 is provided on the inner side of the powder feeding pipe 2111, which provides rotational support for the spiral powder feeding blades 2113. A spiral powder feeding blade 2113 is fixedly connected to the outer wall of 112. The spiral powder feeding blade 2113 rotates and pushes the powder to move inside the powder feeding pipe 2111. A powder feeding motor 2114 is fixedly connected to the right end of the powder feeding pipe 2111. The powder feeding motor 2114 provides rotational power to the rotating shaft 2112 and the spiral powder feeding blade 2113. The output end of the powder feeding motor 2114 is fixedly connected to the right end of the rotating shaft 2112 to ensure effective power transmission. A powder storage tank 2115 is connected to the top right side of the powder feeding pipe 2111 through a pipe. The powder storage tank 2115 stores the powder to be conveyed. A stirring shaft 301 is set inside the powder storage tank 2115. The rotation of the stirring shaft 301 can stir the powder in the powder storage tank 2115 to make it more uniformly mixed. A control component 212 is set on the outside of the combustion chamber 1. The control component 212 monitors and controls the operating parameters of the device in real time. The control component 212 includes a temperature sensor 2121, which is used to monitor the temperature of the combustion chamber 1 in real time. The bottom of the temperature sensor 2121 is fixedly connected to the top left side of the combustion chamber 1 to ensure accurate measurement of the temperature at that position in the combustion chamber 1. A pressure sensor 2122 is fixedly connected to the top right side of the combustion chamber 1 to monitor the pressure of the combustion chamber 1 in real time. A temperature sensor 2123 is fixedly connected to the front left side of the acceleration tube 4 to monitor the temperature at that position in the acceleration tube 4 in real time. A pressure sensor 2124 is fixedly connected to the front right side of the acceleration tube 4 to monitor the pressure at that position in the acceleration tube 4 in real time. A controller 2125 is fixedly connected to the front side of the powder storage tank 2115. The controller 2125 receives data from each sensor and regulates the operation of the device according to a preset program to ensure the stability of the spraying process. Specifically, the heat sink assembly 2101 increases the heat dissipation area and is tightly connected to the outer wall of the acceleration tube 4 for efficient heat dissipation. The heat conduction pipes 2102 around the inner wall further accelerate heat conduction, assisting the acceleration tube 4 in cooling down and preventing it from deforming due to overheating. The powder feeding assembly 211 drives the rotating shaft 2112 and the spiral powder feeding blades 2113 through the powder feeding motor 2114 to stably transport the powder in the powder storage tank 2115 to the combustion chamber 1. The control assembly 212 uses multiple sensors to monitor the temperature and pressure of the combustion chamber 1 and the acceleration tube 4 in real time. The controller 2125 makes precise adjustments based on this to ensure stable operation of the device and improve the spraying quality and efficiency.

[0028] Reference Figure 1 , Figure 2 and Figure 4 The stirring and preheating mechanism 3 includes a stirring shaft 301. As a core component, the stirring shaft 301 provides rotational support and transmits power to the stirring paddle 302 and the screw propeller 303. The stirring shaft 301 is located at the top right side of the combustion chamber 1. This position facilitates pre-treatment of the powder from the powder storage tank 2115 and makes it easier to subsequently feed the powder into the combustion chamber 1. The stirring paddle 302 is fixedly connected to the bottom of the outer wall of the stirring shaft 301. The stirring paddle 302 rotates with the stirring shaft 301, stirring the powder in the powder storage tank 2115 to ensure uniform mixing of powders of different types or particle sizes, thus preventing uneven powder distribution from affecting the coating. To ensure coating quality, a screw propeller 303 is fixedly connected to the bottom end of the stirring shaft 301. When the screw propeller 303 rotates, it gradually pushes the evenly stirred powder downwards, preparing the powder to enter the combustion chamber 1. A preheating pipe 304 is provided on the outside of the stirring shaft 301. The preheating pipe 304 generates heat by electric heating to preheat the powder around the stirring shaft 301, so that the powder can melt more quickly in the high-temperature gas flow after entering the combustion chamber 1, improving melting efficiency and ensuring coating quality. A drive assembly 305 is provided at the top of the stirring shaft 301, which provides the power required for the rotation of the stirring shaft 301. The drive assembly 305 includes a mounting base 3051, which is fixed to the top of the powder storage tank 2115, providing a stable mounting foundation for the entire drive assembly 305. The bottom of the mounting base 3051 is fixedly connected to the top of the powder storage tank 2115, ensuring a tight connection between the drive assembly 305 and the powder storage tank 2115 to prevent shaking during operation. A stirring motor 3052 is fixedly connected to the top of the inner wall of the mounting base 3051. The stirring motor 3052 serves as a power source, generating rotational power after being powered on. A reduction motor 3053 is fixedly connected to the output end of the stirring motor 3052. The reduction motor 3053 adjusts the output speed of the stirring motor 3052 to meet the different working speed requirements of the stirring shaft 301. The output end of the reduction motor 3053 is fixedly connected to the top end of the stirring shaft 301, accurately transmitting the speed-adjusted power to the stirring shaft 301 to ensure stable rotation of the stirring shaft 301. Specifically, the stirring shaft 301 drives the stirring paddle 302 and the screw propeller 303. The former ensures that the powder in the powder storage tank 2115 is mixed evenly, avoiding quality problems in the coating due to uneven powder. The latter pushes the mixed powder to a suitable position, and the outer preheating pipe 304 preheats the powder, improving its melting efficiency in the combustion chamber 1. The drive assembly 305 is securely installed through the mounting base 3051, and provides power to the stirring shaft 301 through the cooperation of the stirring motor 3052 and the reduction motor 3053, ensuring stable stirring and preheating.

[0029] Reference Figure 1 , Figure 2 and Figure 4 A sealing ring 6 is fixedly connected to the left side of the outer wall of the powder feeding pipe 2111. The sealing ring 6 plays a sealing role to prevent powder from leaking from the connection between the powder feeding pipe 2111 and the combustion chamber 1 during the powder feeding process, thus ensuring the sealing performance of the powder feeding. The left side of the sealing ring 6 is fixedly connected to the right side of the combustion chamber 1, so that the powder feeding pipe 2111 and the combustion chamber 1 are tightly combined, further enhancing the sealing effect. A rotating disk 7 is fixedly connected to the upper middle part of the outer wall of the stirring shaft 301. The rotating disk 7 provides an installation base for the dispersing blades 8. The dispersing blades 8 rotate together with the stirring shaft 301. Dispersing blades 8 are fixedly connected to all four sides of the outer wall of the rotating disk 7. The dispersing blades 8 further disperse the powder during the rotation process, making the powder distribution more uniform and helping to improve the spraying quality. Specifically, the sealing ring 6 prevents powder leakage, ensures good sealing during the powder feeding process, and avoids powder escaping from affecting the working environment and spraying efficiency. The rotating disk 7 and dispersing blades 8 on the stirring shaft 301 can further disperse the powder evenly when the stirring shaft 301 rotates, optimize the powder distribution, and improve the uniformity and quality of the final coating sprayed onto the blades.

[0030] Working principle: When the supersonic flame spraying device for the last stage blades of the steam turbine is working, the output end of the powder feeding motor 2114 rotates, driving the rotating shaft 2112 to rotate, which in turn causes the spiral powder feeding blades 2113 to rotate, conveying the powder in the powder storage tank 2115 to the combustion chamber 1 along the powder feeding pipe 2111. At the same time, in the combustion chamber 1, fuel and oxygen mix and burn, generating a high-temperature, high-speed airflow. The powder that has just been fed in is accelerated and begins to melt under the action of this high-speed airflow. Subsequently, the molten powder particles enter the acceleration pipe 4, where they are further accelerated to form... The supersonic jet is ultimately ejected at high speed from nozzle 5, impacting the surface of the last-stage turbine blades to form a dense coating. Temperature sensor 2121 and pressure sensor 2122 monitor the temperature and pressure of combustion chamber 1, respectively, while temperature sensor 2123 and pressure sensor 2124 monitor the temperature and pressure of accelerator tube 4. These sensors feed the data back to controller 2125 in real time, which adjusts the fuel-oxygen ratio accordingly to ensure the stability of the spraying process. Throughout the spraying process, the cooling water tank 201... Driven by the circulating pump 205, the coolant flows within the outlet pipe 202. The flowing coolant impacts the spiral guide vanes 208, and the reaction force generated by the spiral shape causes the spiral guide vanes 208 to rotate around the rotating shaft 207, which in turn drives the guide cone 209 to rotate as well. The rotating shaft 207 rotates on the inner wall of the mounting ring 206, guiding the coolant to form a spiral flow, enhancing the cooling effect, increasing the contact time and area between the coolant and the spiral wound tube 203, and optimizing the flow path of the coolant. The coolant then passes tightly around the spiral wound tube 203 and accelerates. The inner wall of tube 4 fully absorbs the heat generated during the operation of the accelerator tube 4, and then flows back to the cooling water tank 201 through the return water pipe 204 to achieve the circulation and cooling of the coolant, effectively preventing the accelerator tube 4 from being damaged due to overheating. In addition, the heat dissipation fin assembly 2101 on the outside of the accelerator tube 4 and the heat conduction pipe 2102 on its inner wall also assist in heat dissipation, further ensuring that the accelerator tube 4 operates at a suitable temperature, effectively reducing the temperature of the accelerator tube 4, avoiding its deformation due to overheating, ensuring stable powder spraying, improving the uniformity of coating thickness, enhancing the bonding strength between the blade and the coating, and extending the service life of the blade. During operation, the mounting base 3051 is fixed to the top of the powder storage tank 2115, providing support for the entire drive assembly 305. The stirring motor 3052 is started, and its output rotates to drive the reduction motor 3053. After adjusting the speed, the reduction motor 3053 transmits power to the stirring shaft 301, causing it to rotate. As the stirring shaft 301 rotates, the stirring paddle 302 located at the bottom of its outer wall rotates accordingly, stirring the powder in the powder storage tank 2115. This ensures uniform mixing of powders of different types or particle sizes, preventing powder separation. Uneven powder distribution leads to coating quality issues. Meanwhile, the screw propeller 303 at the bottom of the stirring shaft 301 also rotates, gradually pushing the mixed powder downwards to prepare it for subsequent entry into the combustion chamber 1. In addition, the preheating pipe 304 surrounding the outside of the stirring shaft 301 plays a preheating role. The preheating pipe 304 can generate heat through electric heating to preheat the powder around the stirring shaft 301. After the preheated powder enters the combustion chamber 1, it can melt more quickly in the high-temperature gas flow, improving melting efficiency and further ensuring the quality and performance of the coating.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., 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 supersonic flame spraying device for the last stage blades of a steam turbine, comprising a combustion chamber (1), characterized in that: The left end of the combustion chamber (1) is connected to an acceleration tube (4), the left end of the acceleration tube (4) is connected to a nozzle (5), a cooling mechanism (2) is provided at the bottom of the combustion chamber (1), and a stirring and preheating mechanism (3) is provided at the top right side of the combustion chamber (1). The cooling mechanism (2) includes a cooling water tank (201), which is located at the bottom of the combustion chamber (1). The top of the cooling water tank (201) is connected to a liquid outlet pipe (202). Multiple mounting rings (206) are fixedly connected at equal intervals to the inner wall of the liquid outlet pipe (202). Corresponding rotating shafts (207) are rotatably connected to the inner walls of the multiple mounting rings (206). Spiral guide vanes (208) are fixedly connected to the outer walls of the multiple rotating shafts (207). Guide cones (209) are fixedly connected to the right ends of the multiple rotating shafts (207). The top end of the liquid outlet pipe (202) is connected to a spiral wound pipe (203), the outer wall of the spiral wound pipe (203) is fixedly connected to the inner wall of the acceleration pipe (4), the bottom end of the spiral wound pipe (203) is connected to a return water pipe (204), the bottom end of the return water pipe (204) is connected to the top left side of the cooling water tank (201), the bottom of the return water pipe (204) is fixedly connected to a circulation pump (205), a heat dissipation assembly (210) is provided on the outside of the acceleration pipe (4), and a powder feeding assembly (211) is provided on the right side of the combustion chamber (1).

2. The supersonic flame spraying device for the last stage blades of a steam turbine according to claim 1, characterized in that: The stirring and preheating mechanism (3) includes a stirring shaft (301), which is located on the top right side of the combustion chamber (1). A stirring paddle (302) is fixedly connected to the bottom of the outer wall of the stirring shaft (301), a spiral propeller (303) is fixedly connected to the bottom end of the stirring shaft (301), a preheating pipe (304) is provided on the outside of the stirring shaft (301), and a drive assembly (305) is provided at the top end of the stirring shaft (301).

3. The supersonic flame spraying device for the last stage blades of a steam turbine according to claim 1, characterized in that: The heat dissipation assembly (210) includes a heat sink assembly (2101), the inner wall of which is fixedly connected to the outer wall of the acceleration tube (4), and heat conduction tubes (2102) are fixedly connected at equal intervals around the inner wall of the heat sink assembly (2101).

4. The supersonic flame spraying device for the last stage blades of a steam turbine according to claim 2, characterized in that: The powder feeding assembly (211) includes a powder feeding pipe (2111), the left end of which is connected to the right side of the combustion chamber (1). A rotating shaft (2112) is provided on the inner side of the powder feeding pipe (2111), and a spiral powder feeding blade (2113) is fixedly connected to the outer wall of the rotating shaft (2112). A powder feeding motor (2114) is fixedly connected to the right end of the powder feeding pipe (2111), and the output end of the powder feeding motor (2114) is fixedly connected to the right end of the rotating shaft (2112). A powder storage tank (2115) is connected to the top right side of the powder feeding pipe (2111) through a pipe. A stirring shaft (301) is located inside the powder storage tank (2115), and a control assembly (212) is provided on the outer side of the combustion chamber (1).

5. The supersonic flame spraying device for the last stage blades of a steam turbine according to claim 4, characterized in that: The control component (212) includes a temperature sensor (2121), the bottom of which is fixedly connected to the top left side of the combustion chamber (1), a pressure sensor (2122) is fixedly connected to the top right side of the combustion chamber (1), a temperature sensor (2123) is fixedly connected to the front left side of the acceleration tube (4), a pressure sensor (2124) is fixedly connected to the front right side of the acceleration tube (4), and a controller (2125) is fixedly connected to the front side of the powder storage tank (2115).

6. The supersonic flame spraying device for the last stage blades of a steam turbine according to claim 2, characterized in that: The drive assembly (305) includes a mounting base (3051), the bottom of which is fixedly connected to the top of the powder storage tank (2115). A stirring motor (3052) is fixedly connected to the top of the inner wall of the mounting base (3051). A reduction motor (3053) is fixedly connected to the output end of the stirring motor (3052). The output end of the reduction motor (3053) is fixedly connected to the top end of the stirring shaft (301).

7. The supersonic flame spraying device for the last stage blades of a steam turbine according to claim 4, characterized in that: A sealing ring (6) is fixedly connected to the left side of the outer wall of the powder feeding pipe (2111), and the left side of the sealing ring (6) is fixedly connected to the right side of the combustion chamber (1).

8. The supersonic flame spraying device for the last stage blades of a steam turbine according to claim 2, characterized in that: A rotating disk (7) is fixedly connected to the upper part of the outer wall of the stirring shaft (301), and dispersing blades (8) are fixedly connected to the outer walls of the rotating disk (7).

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