Method for manufacturing auxiliary bottom ring of water turbine

Abstract

The invention relates to the field of water turbines, and discloses a water turbine auxiliary bottom ring manufacturing method. According to the water turbine auxiliary bottom ring manufacturing method, an upper connecting ring plate is included, the upper end and the lower end of the upper connecting ring plate are fixedly connected with a structure connecting plate, the lower end of the structure connecting plate is fixedly connected with an upper connecting plate, and the lower end of the upper connecting plate is fixedly connected with a threaded connecting opening; the gasket facilitates auxiliary reinforcement of connection between the upper connecting plate and the lower connecting plate and facilitates operation and use of workers, the upper connecting ring plate is connected with the structure connecting plate, and the position of the upper connecting plate is connected through the structure connecting plate, so that structural connection is complete, and subsequent use of water turbine operation is facilitated; by using the structure, disassembly and assembly in use are facilitated, disassembly is performed when the structure is not used, use for storage operation is facilitated, the use structure is simple, assembly and use by workers are facilitated, and use for subsequent operation is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of water turbines, and in particular relates to a method for manufacturing a water turbine auxiliary bottom ring. Background Art

[0002] A method for manufacturing a turbine auxiliary bottom ring, which is a common component of a turbine. It is generally a two-petal structure, and its diameter after being assembled is 5 to 7 meters and its height is about one meter; its structure is simple and it is very easy to deform during welding and processing; there is a lower leak-proof ring structure on the inner side, and the inner circle size of the lower leak-proof ring is an important size, and it is necessary to ensure that no residual stress deformation will be generated during the assembly on site after the lower leak-proof ring is processed. The current technology is that the auxiliary bottom ring is welded as a whole except for the lower leak-proof ring structure, and the lower leak-proof ring assembly is welded as a whole and the lower leak-proof ring is heat treated after welding; then the auxiliary bottom ring and the lower leak-proof ring are processed to their matching positions respectively; the auxiliary bottom ring is welded to the lower leak-proof ring weld, and no heat treatment is performed after welding to eliminate stress, only vibration stress is performed.

[0003] In the prior art, the auxiliary bottom ring and the lower leak-proof ring weld are only subjected to vibration stress relief. Since vibration stress relief has limited effect on eliminating welding residual stress, the auxiliary bottom ring still faces a high risk of residual stress deformation after subsequent processing.

[0004] However, common existing technical solutions cannot completely eliminate the residual stress in the weld between the auxiliary bottom ring and the lower leak-proof ring, and there is still a quality risk of residual stress deformation. Summary of the invention

[0005] The purpose of the present invention is to provide a method for manufacturing a turbine auxiliary bottom ring in order to solve the above-mentioned problem of reducing the quality risk of residual stress deformation.

[0006] In a preferred embodiment, a method for manufacturing a turbine auxiliary bottom ring includes an upper connecting ring plate, wherein the upper and lower ends of the upper connecting ring plate are fixedly connected to a structural connecting plate, the lower end of the structural connecting plate is fixedly connected to the upper connecting plate, the lower end of the upper connecting plate is fixedly connected to a threaded connecting port, the lower end of the upper connecting plate is provided with a lower connecting plate, the interior of the lower connecting plate is provided with a threaded groove, the threaded connecting port is threadedly connected to the interior of the threaded groove, and a gasket is provided in the middle position of the upper connecting plate and the lower connecting plate.

[0007] By adopting the above technical scheme, in the use of the structure, the splicing installation between the upper connecting plate and the lower connecting plate can be used to facilitate the assembly of the component structure, so as to facilitate subsequent operations. In use, the threaded connection port is threadedly connected to the inside of the threaded groove to ensure that the connection between the upper connecting plate and the lower connecting plate is firm and normal connection use is ensured. The gasket is convenient for auxiliary strengthening of the connection between the upper connecting plate and the lower connecting plate, which is convenient for the staff to operate and use. The upper connecting ring plate is connected to the structural connecting plate, and the position of the upper connecting plate is connected through the structural connecting plate, so that the structural connection is complete, which is convenient for subsequent use in turbine operations. By using this structure, it is convenient to disassemble and assemble during use. When not in use, it is disassembled to facilitate storage operations. The simple structure is convenient for the staff to assemble and use, ensuring subsequent operations.

[0008] In a preferred embodiment, the upper connecting plate and the lower connecting plate are both composed of the same material, the internal material of the upper connecting plate is provided with cast iron, the lower end of the cast iron is provided with carbon steel, the lower end of the carbon steel is provided with a composite material, and the lower end of the composite material is provided with an alloy.

[0009] By adopting the above technical solution, a multi-layer structure is provided to facilitate improving the structural performance of the component so as to meet its performance requirements under high water pressure and mechanical load. The cast iron turbine auxiliary bottom ring is one of the commonly used materials because of its good casting performance, strength and wear resistance. The carbon steel is a common engineering material with high strength and good toughness, and is suitable for parts that bear large mechanical loads. The composite material provides lighter weight and higher strength, and can be used for specific design requirements to reduce dead weight and improve corrosion resistance. The alloy is suitable for turbine operation for specific operating conditions through excellent wear resistance and corrosion resistance.

[0010] In a preferred embodiment, a lower connecting ring plate is fixedly connected to the lower end of the lower connecting plate, and an inner structural plate is arranged inside the upper connecting plate.

[0011] By adopting the above technical solution, the telescopic lower connecting plate is connected to the lower connecting ring plate, so that the connection between the structures is complete, which is convenient for subsequent structural composition. The inner structure plate is the internal structure of the structure, ensuring the normal connectivity and use of the structure.

[0012] In a preferred embodiment, a lower leak-proof ring 1 is welded to the lower end of the lower connecting ring plate, and a lower leak-proof ring 2 is fixedly connected to the lower end of the lower leak-proof ring 1.

[0013] By adopting the above technical solution, the lower leak-proof ring 1 and the lower leak-proof ring 2 constitute the main body, which is convenient for connecting the auxiliary bottom ring structure and provides welding connection to ensure the sealing use of the structure.

[0014] In a preferred embodiment, the outer surfaces of the upper connecting ring plate and its lower end component are polished.

[0015] By adopting the above technical solution, the grinding process can effectively remove the rough and uneven parts on the surface of the auxiliary bottom ring, making its surface smoother and more uniform. The smooth surface can reduce the friction coefficient and reduce the wear when contacting with other parts, which helps to improve the overall efficiency of the turbine and thus extend the service life of the auxiliary bottom ring and reduce frequent maintenance or replacement.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] In the present invention, 1. the weld seams between the auxiliary bottom ring and the lower leak-proof ring are heat treated to eliminate stress after welding, which can eliminate the residual stress of the weld seam to the greatest extent and reduce the risk of deformation after processing;

[0018] 2. The heat treatment of the lower leak-proof ring assembly is cancelled and the heat treatment of the auxiliary bottom ring is added, which increases the manufacturing cost slightly.

[0019] In the present application, in the use of the structure, the splicing installation between the upper connecting plate and the lower connecting plate can be used to facilitate the assembly of the component structure, so as to facilitate subsequent operations. In use, the threaded connection port is threadedly connected to the inside of the threaded groove to ensure that the connection between the upper connecting plate and the lower connecting plate is stable and normal connection use is ensured. The gasket is convenient for assisting in strengthening the connection between the upper connecting plate and the lower connecting plate, which is convenient for the staff to operate and use. The upper connecting ring plate is connected to the structural connecting plate, and the position of the upper connecting plate is connected through the structural connecting plate, so that the structural connection is complete, which is convenient for subsequent use in turbine operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the auxiliary bottom ring structure of the turbine of the present invention;

[0021] Figure 2 It is a schematic diagram of the lower leak-proof structure of the present invention;

[0022] Figure 3 It is a top view of the auxiliary bottom ring structure of the turbine in the present invention;

[0023] Figure 4 It is a schematic diagram of the connection of the auxiliary bottom ring structure of the turbine in the present invention;

[0024] Figure 5 This is a material structure diagram of the auxiliary bottom ring of the turbine in the present invention;

[0025] Figure 6 It is a schematic diagram of the plane connection of the auxiliary bottom ring diagram in the present invention.

[0026] Markings in the figure: 1. Upper connecting ring plate; 2. Upper connecting plate; 3. Lower connecting plate; 4. Lower connecting ring plate; 5. Gasket; 6. Structural connecting plate; 7. Lower leak-proof ring 1; 8. Lower leak-proof ring 2; 9. Inner structural plate; 10. Thread groove; 11. Threaded connection port; 12. Cast iron; 13. Composite material; 14. Alloy; 15. Carbon steel. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example:

[0029] Reference Figure 1-5 A method for manufacturing a turbine auxiliary bottom ring includes an upper connecting ring plate 1, the upper and lower ends of the upper connecting ring plate 1 are fixedly connected with a structural connecting plate 6, the lower end of the structural connecting plate 6 is fixedly connected with an upper connecting plate 2, the lower end of the upper connecting plate 2 is fixedly connected with a threaded connection port 11, the lower end of the upper connecting plate 2 is provided with a lower connecting plate 3, the interior of the lower connecting plate 3 is provided with a threaded groove 10, the threaded connection port 11 is threadedly connected to the interior of the threaded groove 10, and a gasket 5 is provided at the middle position of the upper connecting plate 2 and the lower connecting plate 3. In the use of the structure, the upper connecting plate 2 and the lower connecting plate 3 can be used for splicing and installation, thereby facilitating the assembly of the structure, so as to facilitate subsequent operations. During use, the threaded connection port 11 is threadedly connected to the inside of the threaded groove 10, thereby ensuring a firm connection between the upper connecting plate 2 and the lower connecting plate 3, ensuring normal connection use, and the gasket 5 is convenient for auxiliary strengthening of the connection between the upper connecting plate 2 and the lower connecting plate 3, which is convenient for the staff to operate and use. The upper connecting ring plate 1 is connected to the structural connecting plate 6, and the position of the upper connecting plate 2 is connected through the structural connecting plate 6, so that the structural connection is complete, which is convenient for subsequent use in turbine operations. By using this structure, it is convenient to disassemble and assemble during use. When not in use, it is disassembled for storage operations. The simple structure is convenient for the staff to assemble and use, ensuring subsequent operations.

[0030] Reference Figure 1-5The upper connecting plate 2 and the lower connecting plate 3 are both composed of the same material. The internal material of the upper connecting plate 2 is provided with cast iron 12, the lower end of the cast iron 12 is provided with carbon steel 15, the lower end of the carbon steel 15 is provided with a composite material 13, and the lower end of the composite material 13 is provided with an alloy 14. By setting a multi-layer structure, it is convenient to improve the structural performance of the component so as to meet its performance requirements under high water pressure and mechanical load. Cast iron 12 is one of the commonly used materials for the auxiliary bottom ring of the turbine because of its good casting performance, strength and wear resistance. Carbon steel 15 is a common engineering material with high strength and good toughness, suitable for parts that bear large mechanical loads. Composite material 13 provides lighter weight and higher strength, and can be used for specific design requirements to reduce dead weight and improve corrosion resistance. Alloy 14 is suitable for operation of turbines through excellent wear resistance and corrosion resistance for specific operating conditions.

[0031] Reference Figure 1-5 ,: The lower end of the lower connecting plate 3 is fixedly connected with a lower connecting ring plate 4, and an inner structure plate 9 is arranged inside the upper connecting plate 2. The telescopic lower connecting plate 3 is connected to the lower connecting ring plate 4, so that the connection between the structures is complete, which is convenient for subsequent structural composition. The inner structure plate 9 is the internal structure of the structure to ensure the normal connectivity and use of the structure.

[0032] Reference Figure 1-5 A lower leak-proof ring 7 is welded to the lower end of the lower connecting ring plate 4, and a lower leak-proof ring 2 8 is fixedly connected to the lower end of the lower leak-proof ring 7. The lower leak-proof ring 1 7 and the lower leak-proof ring 2 8 constitute the main body, which is convenient for connecting the auxiliary bottom ring structure and providing welding connection to ensure the sealing use of the structure.

[0033] Reference Figure 1-5 The outer surfaces of the upper connecting ring plate 1 and its lower end assembly are polished, which can effectively remove the rough and uneven parts on the surface of the auxiliary bottom ring, making its surface smoother and more uniform. The smooth surface can reduce the friction coefficient and reduce the wear when contacting with other parts, which helps to improve the overall efficiency of the turbine and thus extend the service life of the auxiliary bottom ring and reduce frequent maintenance or replacement.

[0034] The implementation principle of the embodiment of the method for manufacturing the auxiliary bottom ring of a water turbine of the present invention is as follows:

[0035] When the structure is used, the upper connecting plate 2 and the lower connecting plate 3 can be spliced ​​and installed to facilitate the assembly of the structure of the components, so as to facilitate subsequent operations. When in use, the threaded connection port 11 is threadedly connected to the inside of the thread groove 10 to ensure that the connection between the upper connecting plate 2 and the lower connecting plate 3 is firm and normal connection is ensured. The gasket 5 is convenient for auxiliary strengthening of the connection between the upper connecting plate 2 and the lower connecting plate 3, which is convenient for the staff to operate and use. The upper connecting ring plate 1 is connected to the structural connecting plate 6, and the position of the upper connecting plate 2 is connected through the structural connecting plate 6, so that the structural connection is complete, which is convenient for subsequent use in turbine operations. By using this structure, it is convenient to disassemble and assemble during use. When not in use, it is disassembled for storage operations. The simple structure is convenient for the staff to assemble and use, ensuring subsequent operations.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for manufacturing a turbine auxiliary bottom ring, characterized in that: The following steps are involved: S1: Except for the structure of the lower leak-proof ring, the auxiliary bottom ring is still manufactured by integral welding and post-weld heat treatment to eliminate stress. After manufacturing, it is processed and assembled with the lower leak-proof ring. The auxiliary bottom ring is still manufactured by integral welding and post-weld heat treatment to eliminate stress. Process support is added during welding, and back-to-back manufacturing is adopted. The weld is hammered layer by layer to eliminate stress to reduce welding stress as much as possible. After heat treatment, it is processed and assembled with the lower leak-proof ring. S2: The lower stop ring assembly is welded as a whole, and no heat treatment is performed after welding. It is directly processed and assembled with the auxiliary bottom ring. The lower stop ring assembly is welded as a whole, and process support is added during welding. Back-to-back manufacturing is adopted, and the weld is hammered layer by layer to reduce welding stress as much as possible; no heat treatment is performed after welding, and it is directly processed and assembled with the auxiliary bottom ring; S3: The auxiliary bottom ring is welded to the lower leak-proof ring assembly. After welding, the auxiliary bottom ring is subjected to secondary heat treatment to eliminate stress. The auxiliary bottom ring is welded to the lower leak-proof ring assembly. During welding, process support is added and back-to-back manufacturing is adopted. The weld is hammered layer by layer to eliminate stress to reduce welding stress as much as possible. After welding, the auxiliary bottom ring is subjected to secondary heat treatment to eliminate stress. S4: Carry out subsequent shot peening, coating, finishing and other processes. The processing is divided into rough processing, semi-finishing and finishing. Natural aging is carried out in between to reduce processing stress. Specific operations: Shot peening operation: Select appropriate shot (such as steel shot, aluminum shot, ceramic shot, etc.) according to the material of the auxiliary bottom ring. The size and hardness of the shot need to be determined according to the material and surface hardness requirements of the workpiece to ensure that the shot evenly hits the target area. Coating process: Use spraying equipment (such as air spray gun or high-pressure spraying equipment) to evenly spray the coating on the surface of the auxiliary bottom ring. The coating thickness should be controlled according to the design requirements to avoid being too thin or too thick. Soak the auxiliary bottom ring in the coating, which is suitable for evenly coating thicker coatings. Finishing: Finishing mainly includes turning, grinding, polishing and other processes, accurately controlling the size, tolerance and surface roughness, and finishing the outer circle, inner hole or end face of the auxiliary bottom ring to ensure that the size of each part meets the design requirements.

2. A method for manufacturing a turbine auxiliary bottom ring according to claim 1, characterized in that: A method for manufacturing a turbine auxiliary bottom ring as described in claim 1, characterized in that: the upper and lower ends of the upper connecting ring plate (1) are fixedly connected to a structural connecting plate (6), the lower end of the structural connecting plate (6) is fixedly connected to an upper connecting plate (2), the lower end of the upper connecting plate (2) is fixedly connected to a threaded connection port (11), the lower end of the upper connecting plate (2) is provided with a lower connecting plate (3), the interior of the lower connecting plate (3) is provided with a threaded groove (10), the threaded connection port (11) is threadedly connected to the interior of the threaded groove (10), and a gasket (5) is provided in the middle position of the upper connecting plate (2) and the lower connecting plate (3).

3. A method for manufacturing a turbine auxiliary bottom ring according to claim 2, characterized in that: The upper connecting plate (2) and the lower connecting plate (3) are both composed of the same material. The internal material of the upper connecting plate (2) is provided with cast iron (12), the lower end of the cast iron (12) is provided with carbon steel (15), the lower end of the carbon steel (15) is provided with a composite material (13), and the lower end of the composite material (13) is provided with an alloy (14).

4. A method for manufacturing a turbine auxiliary bottom ring according to claim 3, characterized in that: The lower end of the lower connecting plate (3) is fixedly connected to a lower connecting ring plate (4), and an inner structural plate (9) is arranged inside the upper connecting plate (2).

5. A method for manufacturing a turbine auxiliary bottom ring according to claim 2, characterized in that: A lower leak-proof ring 1 (7) is welded to the lower end of the lower connecting ring plate (4), and a lower leak-proof ring 2 (8) is fixedly connected to the lower end of the lower leak-proof ring 1 (7).

6. A method for manufacturing a turbine auxiliary bottom ring according to claim 2, characterized in that: The outer surfaces of the upper connecting ring plate (1) and its lower end component are both polished.

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