Nuclear power gate valve body steel water filtering device

Abstract

The application discloses a kind of nuclear power gate valve body molten steel filtering device, including liquid injection tank, the upper end of the liquid injection tank is installed with the liquid inlet channel being communicated with its inside, and the liquid inlet channel is embedded with baffle, two porous ceramic filter plates are arranged in the liquid injection tank, the liquid outlet channel being communicated with its inside is installed on the both sides of the liquid injection tank, the lower end of the baffle is fixedly connected with support by telescopic link, and the side wall of the support is rotatably connected with arc-shaped cylinder.The filter residue on the liquid level is gently scooped up by the arc-shaped cylinder and flows into the liquid storage hopper for temporary storage, and then discharged outward through the discharge hopper and the discharge pipe, so that the molten steel in the liquid injection tank does not flow substantially, which can more effectively and completely clean the filter residue on the liquid level, without increasing the outflow speed of the molten steel, ensuring that the molten steel in the mold is in a stable state, and improving the processing quality of the final valve body casting.

Description

Technical Field

[0001] This invention relates to the field of casting filtration technology, and more particularly to a molten steel filtration device for a nuclear power plant gate valve body. Background Technology

[0002] Nuclear power plant gate valves are generally formed by direct sampling casting process. To ensure the surface quality and performance of the valve body, impurities in the molten steel need to be filtered out through a filtration device during the pouring process.

[0003] Current molten steel filtration devices, such as the molten steel filtration device for anchor chain wheel casting disclosed in patent publication number "CN115213393B", mainly involve introducing argon gas into the molten steel. The air bubbles carry impurities to the surface, where a centrifugal frame then rotates to throw the impurities and filter residue to the periphery. Finally, a retrieval component removes the filter residue from the periphery. This method has the following drawbacks: to throw the filter residue to the periphery, the centrifugal frame needs a high rotation speed. Furthermore, the centrifugal frame continuously agitates the molten steel, causing the filter residue on the surface to remix with the upper and lower layers of molten steel. This makes it difficult for the retrieval component to completely remove the filter residue from the molten steel. Additionally, the increased speed and kinetic energy of the molten steel due to the centrifugal frame rotation can increase the pressure of the molten steel in the mold, leading to uneven distribution of the molten steel and a decrease in the quality of the cast part. Therefore, this application proposes a molten steel filtration device for nuclear power plant gate valve bodies. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a molten steel filtration device for nuclear power plant gate valve bodies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A molten steel filtration device for a nuclear power plant gate valve body includes a liquid injection tank. An inlet channel communicating with the interior of the liquid injection tank is installed at its upper end, and a partition is embedded within the inlet channel. Two porous ceramic filter plates are installed inside the liquid injection tank. Outlet channels communicating with the interior of the liquid injection tank are installed on both sides of the liquid injection tank. A bracket is fixedly connected to the lower end of the partition via a telescopic rod. An arc-shaped cylinder is rotatably connected to the side wall of the bracket, and a liquid storage hopper is fixedly connected to the lower end of the arc-shaped cylinder. An outlet pipe is also fixedly connected to the side wall of the arc-shaped cylinder. A rotating mechanism for rotating the arc-shaped cylinder is installed on the bracket. An argon gas injection mechanism is installed at the bottom of the liquid injection tank. An outlet pipe is provided on the side wall of the liquid injection tank, and the upper end of the outlet pipe is connected to an outlet hopper.

[0007] Preferably, the rotating mechanism includes two gears, which are rotatably connected to the two side walls of the support respectively. The gears are fixedly connected to the arc-shaped cylinder. An upper rack and a lower rack are fixedly connected to the inner wall of the injection tank. A spring is fixedly connected to the lower end of the partition, and the lower end of the spring is fixedly connected to the upper end of the support.

[0008] Preferably, the gas injection mechanism includes a gas supply plate installed inside the injection tank. The side wall of the gas supply plate is provided with a guide groove, and the top of the guide groove is provided with a plurality of exhaust holes. A gas supply pipe is fixedly installed at the lower end of the gas supply plate, and the gas supply pipe is connected to the inside of the guide groove.

[0009] Preferably, two diversion plates are slidably connected inside the injection tank, and the two diversion plates are respectively arranged on both sides of the partition. A push rod is fixedly connected to the upper end of the diversion plate, and a push plate is fixedly connected to the upper end of the push rod. The push rod slides through the inner top of the injection tank.

[0010] Preferably, the bottom of the arc-shaped cylinder is inclined in a concave shape towards the center, and the liquid storage hopper is located in the central region of the arc-shaped cylinder.

[0011] Preferably, the upper rack and the lower rack are respectively disposed on both sides of the bracket, and the upper rack and the lower rack are located on the same vertical line as the adjacent gear.

[0012] The present invention has the following beneficial effects:

[0013] 1. By setting up components such as a support, an arc-shaped cylinder, a liquid storage hopper, and a rotating mechanism, when the blown-in argon gas carries impurities and filter residue to the surface of the liquid, the rotating mechanism drives the arc-shaped cylinder to rotate during the up-and-down movement of the support. The arc-shaped cylinder can gently scoop up the filter residue from the surface of the liquid and let it flow into the liquid storage hopper for temporary storage. Then, it is discharged outward through the outlet hopper and outlet pipe. This prevents the molten steel in the injection tank from flowing out significantly, which can more effectively and thoroughly clean the filter residue on the surface of the liquid, while not increasing the outflow speed of the molten steel. This ensures that the molten steel in the mold is in a stable state and improves the final processing quality of the valve body casting.

[0014] 2. By setting up baffles and two diversion plates, molten steel can flow into the injection tank from the diversion plates on both sides. On the one hand, this allows the molten steel to quickly come into contact with the porous ceramic filter plates on both sides, thereby accelerating the filtration process. On the other hand, when the molten steel flows down from both sides, it can flow into the molten steel in the injection tank along the side wall of the porous ceramic filter plate, which can avoid agitating large fluctuations in the molten steel in the injection tank, effectively ensuring the stable state of the molten steel in the injection tank, and further improving the casting quality of the valve body. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a molten steel filtration device for a nuclear power plant gate valve body proposed in this invention;

[0016] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A in the diagram;

[0017] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at point BB;

[0018] Figure 4 This is a cross-sectional view of section BB when the support moves down and the arc-shaped cylinder scoops up the filter residue from the liquid surface.

[0019] Figure 5 This is a cross-sectional view of section BB when the support moves upward and the filter residue is discharged from the arc-shaped cylinder.

[0020] In the diagram: 1. Injection tank, 2. Porous ceramic filter plate, 3. Liquid outlet channel, 4. Liquid inlet channel, 5. Baffle plate, 6. Diverter plate, 7. Push plate, 8. Push rod, 9. Telescopic rod, 10. Spring, 11. Support, 12. Gear, 13. Lower rack, 14. Upper rack, 15. Arc-shaped cylinder, 16. Liquid storage hopper, 17. Air supply plate, 18. Air supply pipe, 19. Exhaust hole, 20. Guide groove, 21. Outlet pipe, 22. Outlet hopper, 23. Liquid outlet pipe. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Reference Figure 1-5 A molten steel filtration device for a nuclear power plant gate valve body includes a liquid injection tank 1. An inlet channel 4 communicating with the interior of the liquid injection tank 1 is installed at its upper end, and a partition 5 is embedded within the inlet channel 4. Two porous ceramic filter plates 2 are installed inside the liquid injection tank 1. Outlet channels 3 communicating with the interior of the liquid injection tank 1 are installed on both sides of the liquid injection tank 1. A bracket 11 is fixedly connected to the lower end of the partition 5 via a telescopic rod 9. It should be noted that... Figure 1 As shown, the bottom of the telescopic rod 9 is fixedly installed on the upper end of the bracket 11, and its telescopic end is fixedly connected to the partition 5. By setting the telescopic rod 9, it can cooperate with the up and down movement of the bracket 11, thereby ensuring that the bracket 11 can move vertically up and down smoothly.

[0023] An arc-shaped cylinder 15 is rotatably connected to the side wall of the support 11, and a liquid storage hopper 16 is fixedly connected to the lower end of the arc-shaped cylinder 15. A liquid outlet pipe 23 is also fixedly connected to the side wall of the arc-shaped cylinder 15. A rotating mechanism for rotating the arc-shaped cylinder 15 is installed on the support 11. An argon gas injection mechanism is installed at the bottom of the liquid injection tank 1. An outlet pipe 21 is provided on the side wall of the liquid injection tank 1, and the upper end of the outlet pipe 21 is connected to an outlet hopper 22. The bottom of the arc-shaped cylinder 15 is inclined in a concave shape towards the center, and the liquid storage hopper 16 is located in the central area of ​​the arc-shaped cylinder 15.

[0024] The rotating mechanism includes two gears 12, which are rotatably connected to the two side walls of the support 11 respectively. The gears 12 are fixedly connected to the arc-shaped cylinder 15. An upper rack 14 and a lower rack 13 are fixedly connected to the inner wall of the injection tank 1. A spring 10 is fixedly connected to the lower end of the partition 5, and the lower end of the spring 10 is fixedly connected to the upper end of the support 11.

[0025] The upper rack 14 and the lower rack 13 are respectively disposed on both sides of the bracket 11, and the upper rack 14 and the lower rack 13 are located on the same vertical line as the adjacent gear 12. For details, please refer to... Figure 1 and Figure 3 The positions of the upper rack 14 and the lower rack 13 are set so that when the support 11 moves up and down past the upper rack 14 and the lower rack 13, it can rotate in opposite directions and drive the arc-shaped cylinder 15 to rotate. Finally, the arc-shaped cylinder 15 first contacts the liquid surface to scoop up the filter residue, sends the filter residue into the storage hopper 16, and discharges the filter residue through the outlet pipe 23.

[0026] The gas injection mechanism includes a gas supply plate 17 installed inside the injection tank 1. A guide groove 20 is formed on the side wall of the gas supply plate 17, and multiple exhaust holes 19 are formed at the top inner part of the guide groove 20. A gas supply pipe 18 is fixedly installed at the lower end of the gas supply plate 17, and the gas supply pipe 18 communicates with the interior of the guide groove 20. It should be noted that a one-way shut-off valve can be installed inside the gas supply pipe 18 to prevent molten steel in the injection tank 1 from flowing back into the gas supply pipe 18.

[0027] Two flow dividers 6 are slidably connected inside the injection tank 1, and the two flow dividers 6 are respectively located on both sides of the partition 5. A push rod 8 is fixedly connected to the upper end of the flow divider 6, and a push plate 7 is fixedly connected to the upper end of the push rod 8. The push rod 8 slides through the inner top of the injection tank 1. Specifically, during the use of this device, the push plate 7 can be driven to move up and down reciprocally by servo control components such as telescopic cylinders and hydraulic cylinders. In this way, the push plate 7 will drive the flow dividers 6 to move up and down synchronously through the push rod 8.

[0028] When molten steel flows into the inlet channel 4, it is separated by the baffle 5 and flows downward along the diversion plates 6 on both sides. After flowing downward through the diversion plates 6, the molten steel flows into the injection tank 1 through the porous ceramic filter plates 2 that are attached to the left and right sides. On the one hand, this quickly separates the molten steel from the porous ceramic filter plates 2, accelerating the filtration efficiency. It also utilizes the kinetic energy of the molten steel flowing downward to further promote the molten steel to pass through the porous ceramic filter plates 2, thereby improving the entire casting process. On the other hand, when the molten steel flows into the porous ceramic filter plates 2, it will not cause the molten steel already present in the injection tank 1 to splash up and cause large agitation. This ensures that the molten steel in the injection tank 1 is in a relatively stable state, thereby ensuring that the molten steel flowing into the casting mold through the outlet channel 3 is in a stable state and improving the casting quality of the valve body.

[0029] At the same time, argon gas is continuously introduced into the flow channel 20 through the gas supply pipe 18. The argon gas will be discharged into the molten steel through each exhaust hole 19. The generated bubbles can carry the impurities and filter residue in the molten steel to float to the surface of the liquid. The principle of the sampling and blowing argon technology to float the filter residue is consistent with the content of the steel filtration device for anchor chain wheel casting disclosed in the background technology of this article with patent publication number "CN115213393B", and will not be elaborated further here.

[0030] When the splitter plate 6 is pushed downward by the push rod 8, the lower side of the splitter plate 6 will contact the bracket 11. As the splitter plate 6 continues to move downward, it will push the bracket 11 downward. At this time, the gear 12 on the left side of the bracket 11 will contact and mesh with the lower rack 13. Subsequently, as the bracket 11 continues to move downward, the gear 12 will move to the left and right of the lower rack 13 as follows: Figure 4 As shown in the diagram, the gear 12 will drive the arc-shaped cylinder 15 to rotate synchronously. The lower opening of the arc-shaped cylinder 15 will then contact the liquid surface, and a layer of molten steel at the liquid surface will carry the filter slag into the arc-shaped cylinder 15. Figure 4 In the direction of flow, the molten steel and filter residue on both sides of the arc-shaped cylinder 15 flow towards the center to replenish the flow, thus effectively and thoroughly allowing the filter residue on the liquid surface to enter the arc-shaped cylinder 15. Then, the push rod 8 pulls the diversion plate 6 to gradually move upward. At this time, the spring 10 will also pull the bracket 11 to gradually move upward. The gear 12 will rotate in the opposite direction to reset the lower rack 13 on the left side, and gradually make the arc-shaped cylinder 15 rotate back to its original position. Due to the inclined structure of the bottom of the arc-shaped cylinder 15 towards the center, some of the molten steel flowing into the arc-shaped cylinder 15 will carry the filter residue into the middle storage hopper 16 for temporary storage.

[0031] As the diverter plate 6 continues to move upward, the spring 10 will also continuously pull the bracket 11 upward. At this time, the gear 12 on the right side of the bracket 11 will pass through the upper rack 14. Thus, as the bracket 11 continues to move upward, under the action of the upper rack 14, the gear 12 will undergo the following action: Figure 5The rotation shown in the figure causes the arc-shaped cylinder 15 to rotate synchronously. At this time, the molten steel in the storage hopper 16 carries the filter residue back into the arc-shaped cylinder 15, and flows through the outlet pipe 23 to the outlet hopper 22, and is finally guided by the outlet pipe 21 to the designated location for recycling.

[0032] In summary, this device, through the design and installation of components such as the support 11, the arc-shaped cylinder 15, the liquid storage hopper 16, and the rotating mechanism, allows the support 11 to move up and down while the rotating mechanism drives the arc-shaped cylinder 15 to rotate. The arc-shaped cylinder 15 can gently scoop up the filter residue from the liquid surface and allow it to flow into the liquid storage hopper 16 for temporary storage. Subsequently, it is discharged outward through the discharge hopper 22 and the discharge pipe 21. This prevents the molten steel in the injection tank 1 from flowing out significantly, thus enabling more effective and thorough cleaning of the filter residue on the liquid surface without increasing the outflow rate of the molten steel. This ensures that the molten steel in the mold remains in a stable state, improving the final processing quality of the valve body casting.

[0033] 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. A molten steel filtration device for a nuclear power plant gate valve body, comprising a liquid injection tank (1), characterized in that, The upper end of the injection tank (1) is equipped with an inlet channel (4) communicating with its interior, and a partition (5) is embedded in the inlet channel (4). The injection tank (1) contains two porous ceramic filter plates (2). Both sides of the injection tank (1) are equipped with outlet channels (3) communicating with its interior. The lower end of the partition (5) is fixedly connected to a bracket (11) via a telescopic rod (9). An arc-shaped cylinder is rotatably connected to the side wall of the bracket (11). 15), and the lower end of the arc-shaped cylinder (15) is fixedly connected to a liquid storage hopper (16), and the side wall of the arc-shaped cylinder (15) is also fixedly connected to a liquid outlet pipe (23). The bracket (11) is equipped with a rotating mechanism to rotate the arc-shaped cylinder (15), the bottom of the liquid injection tank (1) is equipped with a gas injection mechanism for injecting argon gas, and the side wall of the liquid injection tank (1) is provided with a discharge pipe (21), and the upper end of the discharge pipe (21) is connected to a discharge hopper (22). The rotating mechanism includes two gears (12), and the two gears (12) are rotatably connected to the two side walls of the bracket (11). The gears (12) are fixedly connected to the arc-shaped cylinder (15). An upper rack (14) and a lower rack (13) are fixedly connected to the inner wall of the injection tank (1). A spring (10) is fixedly connected to the lower end of the partition (5), and the lower end of the spring (10) is fixedly connected to the upper end of the bracket (11). The gas injection mechanism includes a gas supply plate (17) installed inside the injection tank (1). The side wall of the gas supply plate (17) is provided with a guide groove (20). The top of the guide groove (20) is provided with multiple exhaust holes (19). A gas supply pipe (18) is fixedly installed at the lower end of the gas supply plate (17), and the gas supply pipe (18) is connected to the inside of the guide groove (20). The injection tank (1) has two flow dividers (6) slidably connected inside, and the two flow dividers (6) are respectively set on both sides of the partition (5). The upper end of the flow divider (6) is fixedly connected to a push rod (8), and the upper end of the push rod (8) is fixedly connected to a push plate (7). The push rod (8) slides through the inner top of the injection tank (1). The bottom of the arc-shaped cylinder (15) is inclined in a concave shape towards the center, and the liquid storage hopper (16) is located in the central region of the arc-shaped cylinder (15); The upper rack (14) and the lower rack (13) are respectively arranged on both sides of the bracket (11), and the upper rack (14) and the lower rack (13) are located on the same vertical line as the adjacent gear (12).

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