Water turbine double-flat-plate flange top cover structure reinforcing device and mounting method thereof

Abstract

The invention discloses a water turbine double-flat-plate flange top cover structure reinforcing device and a mounting method thereof, and relates to the technical field of pumped storage power station pump turbine systems, the water turbine double-flat-plate flange top cover structure reinforcing device comprises a plurality of sets of reinforcing assemblies fixed between double-flat-plate flange top cover structures, each reinforcing assembly comprises a fixing block and a reinforcing block, and the fixing blocks are welded to the side of a seat ring side flange plate; the reinforcing block is welded to the top cover side flange plate side, the longitudinal section of the fixing block and the longitudinal section of the reinforcing block are both right trapezoids, a guide groove is formed in the side of the fixing block, a connecting block is arranged on the side of the reinforcing block, and the reinforcing block and the fixing block are fixed through the guide groove and the connecting block. According to the device, the reinforcing block is driven to move towards the outer side of the top cover by tightening the fastening bolt to extend into the connecting hole, so that the reinforcing block, the top cover side flange plate and the fixing block are pressed tightly, the effect of reinforcing the top cover flange structure can be achieved without overall replacement, and the problem of construction difficulty caused by small space of the top cover flange surface is solved; and subsequent overhaul and maintenance are facilitated.

Description

Technical Field

[0001] This invention belongs to the technical field of pump-turbine systems for pumped storage power stations, and particularly relates to a reinforcement device for the double-plate flange top cover structure of a turbine and its installation method. Background Technology

[0002] According to the "Basic Technical Conditions for Hydropower Turbines" (GBT15468-2006), "4.2.2.6 When prestressing is required, bolts, threaded rods, connecting rods, and other components shall be prestressed. The prestress of the components shall not exceed 7 / 8 of the material's yield strength, and the load on the bolts shall not be less than twice the design load of the connection." For top cover bolts that do not meet the national standard requirements, replacement is necessary to improve the safety margin. Replacing the bolts will increase the corresponding preload, but the strength of the double-plate top cover itself cannot be changed, necessitating reinforcement of the flange structure.

[0003] Existing enhancement technologies include the following two types:

[0004] One option is to replace the entire top cover with a higher strength one. However, replacing the entire top cover involves complex and time-consuming construction procedures, and the cost of such a complete replacement is also high, making it unsuitable for large-scale application.

[0005] The second method involves welding reinforcing plates between the flange faces of the double-plate top cover. This is the most commonly used method at present. However, due to the small space on the flange face, the welding construction is extremely difficult, making it hard to guarantee the welding quality. Moreover, this type of reinforcement is difficult to meet the design requirements.

[0006] Therefore, it is necessary to design a reinforcement device for the double flat flange top cover structure of a water turbine to solve the above problems. Summary of the Invention

[0007] The technical problem to be solved by this invention is to overcome the shortcomings of the existing technology and design a strengthening device for the top cover structure of a double-plate flange of a water turbine. This strengthening device includes multiple sets of reinforcing components fixed between the double-plate flanges. The reinforcing components include a fixing block and a reinforcing block. The fixing block is welded to the side of the flange plate on the seat ring side, and the reinforcing block is welded to the side of the flange plate on the top cover side. The side of the fixing block is provided with a guide groove, and the side of the reinforcing block is provided with a connecting block corresponding to the guide groove. The reinforcing block and the fixing block are fixed by the guide groove and the connecting block to ensure that the fixing block and the reinforcing block will not shift laterally during installation and sliding. The reinforcing block is provided with a connecting hole, and a fastening bolt is provided in the connecting hole. The end of the fastening bolt is provided with a nut. By tightening the fastening bolt and inserting it into the connecting hole, the reinforcing block can be moved along the wedge-shaped guide groove, so that the reinforcing block, the flange plate on the top cover side, and the fixing block are pressed together. It can strengthen the top cover flange structure without replacing the entire top cover or changing the site conditions, solving the construction difficulties caused by the small space of the top cover flange face, and facilitating subsequent inspection and maintenance.

[0008] The solution adopted by this invention to solve its technical problem is as follows:

[0009] A reinforcement device for the double-plate flange top cover structure of a water turbine.

[0010] It includes a reinforcement device comprising multiple sets of reinforcement components fixed between the double-plate flanges, the reinforcement components being fixed between two top cover bottom ring connecting bolts.

[0011] The reinforcement component includes a fixing block and a reinforcement block, wherein the reinforcement block is fixed to the side of the fixing block.

[0012] The fixing block is fixed to the side of the flange plate of the seat ring by spot welding and intermittent welding.

[0013] The reinforcing block is fixed to the side of the top cover side flange plate by spot welding and intermittent welding.

[0014] The longitudinal section of both the fixing block and the reinforcing block is a right-angled trapezoid, and the cross section of both the fixing block and the reinforcing block is a rectangle.

[0015] The fixing block has a guide groove on its side, and the reinforcing block has a connecting block corresponding to the guide groove on its side. The reinforcing block and the fixing block are fixed together by the guide groove and the connecting block.

[0016] A miniature pressure sensor is installed at the bottom of the fixing block, and the miniature pressure sensor is connected to a display and a buzzer alarm.

[0017] As a preferred embodiment of the present invention

[0018] The reinforcing block is provided with a connecting hole, a fastening bolt is installed in the bolt hole, and a nut is provided at the end of the fastening bolt.

[0019] The connecting hole is circular, and the center of the connecting hole coincides with the center point of the cross-section of the reinforcing block.

[0020] As a preferred embodiment of the present invention

[0021] The longitudinal cross-sectional dimensions of the reinforcing block are: top diameter 112.18 mm, bottom diameter 120.22 mm, and height 155 mm.

[0022] The longitudinal cross-sectional dimensions of the fixing block are: top base 109mm, bottom base 118.6mm, and height 185mm.

[0023] The width of the cross-section of the reinforcing block and the width of the cross-section of the fixing block are both 70mm.

[0024] The guide groove has a depth of 13mm and a width of 32mm.

[0025] The width of the connecting block is 32mm, and the height of the connecting block is 10mm.

[0026] The distance between the center of the connecting hole and the upper and lower edges of the fixing hole is 55mm, and the distance between the center of the connecting hole and the left and right edges of the fixing hole is 55mm.

[0027] As a preferred embodiment of the present invention

[0028] The connecting hole includes a 50mm threaded hole and a 105mm through hole. The nominal diameter of the threaded hole is 30mm, and the diameter of the through hole is 32mm.

[0029] As a preferred embodiment of the present invention

[0030] Both the fixing block and the reinforcing block have a welding cut surface on the side near the edge of the plate, and the welding cut surface is located on the side of the two blocks that contact the plate.

[0031] As a preferred embodiment of the present invention

[0032] The welding cross-sectional structure of the fixing block and the reinforcing block is consistent.

[0033] The welding cut surface is formed by cutting the internal area of ​​the fixed block along four edges 25mm away from the edge line, using the edge line of the fixed block as a reference.

[0034] As a preferred embodiment of the present invention

[0035] The reinforcement component is provided with pre-drilled holes for placing connecting pins.

[0036] As a preferred embodiment of the present invention

[0037] The reinforcement components are made of low-carbon steel.

[0038] As a preferred embodiment of the present invention

[0039] The contact surfaces of the guide groove and the connecting block are both coated with a hard ceramic coating.

[0040] A method for installing a reinforcement device for a double-plate flange top cover structure of a water turbine.

[0041] The turbine double-plate flange top cover structure reinforcement device as described in any one of claims 1-9 is adopted.

[0042] Its characteristic is that it includes the following steps:

[0043] S1: Based on the actual site conditions, select appropriate reinforcement components, place the fixing block and the reinforcement block between the double-plate flanges, and advance the reinforcement block along the guide groove via the connecting block. The double plates position the reinforcement components.

[0044] S2: Weld the fixing block to the side of the flange plate on the seat ring side.

[0045] S3: Tighten the fastening bolts to the standard torque to drive the reinforcing block to press against the top cover side flange plate and the fixing block along the guide groove.

[0046] S4: Check whether the gaps between the fixing block and the flange plate on the seat ring side, the fixing block and the reinforcing block, and the flange plate on the top cover side are up to standard.

[0047] S5: After inspection and approval, weld the reinforcing block to the side of the top cover flange plate.

[0048] S6: After welding is completed, all welds shall be inspected for defects.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] This invention relates to a reinforcement device for the top cover structure of a double-plate flange of a water turbine. It comprises multiple sets of reinforcement components fixed between the double-plate flanges. It achieves the purpose of strengthening the top cover flange structure without replacing the entire top cover or altering the site conditions. While strengthening the top cover flange structure, it also solves the construction difficulties caused by the limited space on the top cover flange surface, facilitating subsequent inspection and maintenance. Through modular overall reinforcement design, a quantifiable and adjustable final torque control mechanism, and embedded intelligent monitoring, it provides an efficient and reliable top cover flange structure reinforcement solution, forming a complete lifecycle management system from precise installation to status monitoring. This solves the pain points of traditional technologies, such as difficult construction, uncontrollable effects, and lack of monitoring, demonstrating significant technological advancement and broad engineering application value. It has the following advantages:

[0051] 1. This invention does not simply reinforce localized areas, but rather forms a complete reinforcement system through a distributed layout of multiple sets of reinforcing components along the circumference of the top cover flange. In each set of reinforcing components, the fixing block and the reinforcing block, through their wedge-shaped bevels, tightly tighten the top cover side flange plate and the seat ring side flange plate under the drive of the bolt preload. This effectively transfers and distributes part of the load traditionally borne solely by the bolts to the newly formed force transmission path created by the reinforcing components, reducing the peak stress on the connecting bolts and enhancing the double-plate flange's resistance to bending deformation and interface opening.

[0052] 2. This invention overcomes the limitation of traditional welded reinforcing plates being unable to be adjusted. Through the fastening bolts and connecting hole structure on the reinforcing block, after the initial welding and positioning of the fixing block, the bolts can be tightened using a standard torque tool. This process directly and quantitatively controls the final position of the reinforcing block moving along the guide groove and the resulting radial preload. This allows installers to accurately set and ensure that each set of reinforcing components reaches the expected compression state according to design requirements and real-time monitoring data, achieving consistency and controllability of the reinforcing force and ensuring reliable reproduction of the reinforcement effect from a construction process perspective.

[0053] 3. This invention upgrades passive reinforcement to active intelligent monitoring by integrating a miniature pressure sensor. The miniature pressure sensor not only provides intuitive force feedback during installation to guide precise tightening, but also continuously monitors the preload status of each reinforcement point during long-term operation. Once the pressure value deviates from the preset safety threshold (indicating loosening or overload), the system immediately triggers an audible and visual alarm, enabling predictive maintenance. This provides valuable early warning time to prevent structural failure, significantly improving equipment safety and the level of intelligent operation and maintenance management. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the installation of a double-plate flange top cover structure reinforcement device for a water turbine proposed in this invention;

[0055] Figure 2 This is a schematic diagram of the installation of a double-plate flange top cover structure reinforcement device for a water turbine proposed in this invention;

[0056] Figure 3 This is a schematic diagram of the installation of a double-plate flange top cover structure reinforcement device for a water turbine proposed in this invention;

[0057] Figure 4 This is a schematic diagram of a structural reinforcement device for a double-plate flange top cover of a water turbine proposed in this invention;

[0058] Figure 5 This is a front view of the fixing block of the reinforcing device for the top cover structure of a double-plate flange of a water turbine proposed in this invention;

[0059] Figure 6 This is a side view of the fixing block of the reinforcing device for the top cover structure of a double-plate flange of a water turbine proposed in this invention;

[0060] Figure 7 This is a top view of the fixing block of the reinforcing device for the top cover structure of a double-plate flange of a water turbine proposed in this invention;

[0061] Figure 8 This is a schematic diagram of a fixing block for a reinforcing device of a double-plate flange top cover structure for a water turbine, as proposed in this invention.

[0062] Figure 9 This is a front view of the reinforcing block of the double-plate flange top cover structure reinforcement device for a water turbine proposed in this invention;

[0063] Figure 10 This is a side view of the reinforcing block of the double-plate flange top cover structure reinforcement device for a water turbine proposed in this invention;

[0064] Figure 11 This is a top view of the reinforcing block of the double-plate flange top cover structure reinforcement device for a water turbine proposed in this invention;

[0065] Figure 12 This is a schematic diagram of a reinforcing block for a double-plate flange top cover structure of a water turbine, as proposed in this invention.

[0066] Figure 13 This is a front view of the fixing block of another embodiment of the reinforcing device for the double-plate flange top cover structure of a water turbine proposed in this invention;

[0067] Figure 14 This is a side view of the fixing block of another embodiment of the reinforcing device for the top cover structure of a double-plate flange of a water turbine proposed in this invention;

[0068] Figure 15This is a top view of a fixing block in another embodiment of a reinforcing device for a double-plate flange top cover structure of a water turbine proposed in this invention;

[0069] Figure 16 This is a schematic diagram of a fixing block of another embodiment of the reinforcing device for the top cover structure of a double-plate flange of a water turbine proposed in this invention;

[0070] Figure 17 This is a front view of the reinforcing block of another embodiment of the reinforcing device for the top cover structure of a double-plate flange of a water turbine proposed in this invention;

[0071] Figure 18 This is a side view of the reinforcing block of another embodiment of the reinforcing device for the top cover structure of a double-plate flange of a water turbine proposed in this invention;

[0072] Figure 19 This is a top view of a reinforcing block of another embodiment of the reinforcing device for the top cover structure of a double-plate flange of a water turbine proposed in this invention;

[0073] Figure 20 This is a schematic diagram of a reinforcing block of another embodiment of the reinforcing device for the top cover structure of a double-plate flange of a water turbine proposed in this invention.

[0074] Explanation of reference numerals in the attached figures:

[0075] 1. Fixed block,

[0076] 1-1, Guide groove,

[0077] 2. Reinforcing blocks,

[0078] 2-1. Connecting block

[0079] 2-2, Connecting hole,

[0080] 2-2-1. Threaded hole,

[0081] 2-2-2, Through hole,

[0082] 2-3. Tighten the bolts.

[0083] 2-4. Nuts

[0084] 3. Seat ring side flange plate,

[0085] 4. Top cover side flange plate,

[0086] 5. Welding cut surface,

[0087] 6. Pre-drilled holes,

[0088] 7. Reinforcement components,

[0089] 8. Top cover bottom ring connecting bolts. Detailed Implementation

[0090] The specific embodiments of the present invention are described below with reference to the accompanying drawings and examples:

[0091] It should be noted that the structures, colors, proportions, sizes, etc. shown in the accompanying drawings are only used to complement the content disclosed in the specification, so that those skilled in the art can understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0092] In the description of this invention, it should be understood that the terms "one end", "the other end", "middle", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0093] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0094] In this invention, it should be clearly understood that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0095] like Figures 1-12As shown, this invention proposes a reinforcement device for the top cover structure of a double-plate flange of a water turbine. The device includes a reinforcement unit fixed between the double-plate flanges for reinforcement. The reinforcement unit comprises multiple sets of reinforcement components 7 fixed between the double-plate flanges. Through the coordinated action of these multiple sets of reinforcement components 7, a complete, distributed circumferential reinforcement system is constructed, thereby achieving an overall increase in the rigidity and coordinated load-bearing capacity of the top cover-seated ring connection structure. This strengthens the top cover flange structure without requiring a complete replacement of the top cover. Furthermore, it solves the problem of construction difficulties caused by the small space on the top cover flange surface while strengthening the top cover flange structure, facilitating subsequent inspection and maintenance.

[0096] The reinforcing component 7 is fixed between two adjacent top cover bottom ring connecting bolts 8. Because the turbine's double-plate top cover flange has multiple top cover bottom ring connecting bolts 8, the installation of the reinforcing device must avoid these bolts and cannot damage the existing structure. Therefore, without damaging the existing turbine structure, the reinforcing device is disassembled into multiple reinforcing components 7, each fixed between the top cover bottom ring connecting bolts 8. This ensures that installation and disassembly will not affect the existing structure, facilitating installation, use, and replacement.

[0097] The reinforcement component 7 includes a fixing block 1 and a reinforcement block 2. The reinforcement block 2 is fixed to the side of the fixing block 1. The fixing block 1 is fixed to the side of the seat ring side flange plate 3 by spot welding and intermittent welding. The reinforcement block 2 is fixed to the side of the top cover side flange plate 4 by spot welding and intermittent welding. The top cover flange structure is strengthened by inserting two mutually fitting block structures between the double flat flanges.

[0098] Both the fixing block 1 and the reinforcing block 2 have right-angled trapezoidal longitudinal sections, specifically the longitudinal section along the Y-axis. Both the fixing block 1 and the reinforcing block 2 have rectangular cross sections. The reinforcing block 2 and the fixing block 1 are respectively provided with an inclined surface. As the reinforcing block 2 moves along the inclined surface, a wedge-shaped fit is formed. The inclined surface squeezes the fixing block 1, so that the two generate radial pressure in the Y-axis direction, achieving the same effect as a wedge being driven into a gap to produce a clamping effect. Thus, without applying additional external force, the structure itself achieves automatic locking through its geometric characteristics, preventing loosening.

[0099] A miniature pressure sensor is installed at the bottom of the fixing block 1, and the miniature pressure sensor is connected to a display and a buzzer alarm. The miniature pressure sensor is fixed to the bottom of the fixing block 1 and can monitor the pressure on the fixing block 1 in real time throughout the process, displaying the results on the display. It can also sound an alarm if the pressure is too high or too low. The sensor provides feedback on the tightening pressure during installation and monitors the tightening effect of the reinforcement device in real time after installation. If the tightening is insufficient, an alarm will sound to remind personnel to perform secondary tightening.

[0100] Preferably, the miniature pressure sensor is a thin-film pressure sensor, which can directly measure contact pressure, provides a clear signal, and has good stability.

[0101] By integrating a miniature pressure sensor at the bottom of the fixing block 1 in the reinforcement component 7, real-time sensing of the fastening force is achieved. This provides precise quantitative guidance during installation, upgrading fastening operations from experience-based to data-driven. Simultaneously, continuous monitoring and intelligent early warning are possible during operation, promptly alerting to conditions of excessively low pressure (loosening) or excessively high pressure (overload), thus providing a comprehensive understanding of the structural condition. Standardization of the installation process ensures uniform and reliable reinforcement, enabling early warning of potential problems, preventing failures, and improving operational efficiency and economy. It not only effectively strengthens the structure but also, through digital and intelligent means, excellently solves the deep-seated problem of long-term monitoring and assurance of reinforcement effects, significantly improving equipment safety, operational efficiency, and management level.

[0102] Specifically, the longitudinal cross-sectional dimensions of reinforcing block 2 are: upper bottom 112.18mm, lower bottom 120.22mm, and height 155mm. The longitudinal cross-sectional dimensions of fixing block 1 are: upper bottom 109mm, lower bottom 118.6mm, and height 185mm. The width of the cross-section of both reinforcing block 2 and fixing block 1 is 70mm. These dimensions were calculated based on the distance between the top cover side flange plate 4 and the seat ring side flange plate 3, and the distance between the connecting bolts 8 of two adjacent top cover bottom rings. The slope of the fixed block 1 and reinforcing block 2 is the same to ensure that the slope is always completely in contact when reinforcing block 2 moves towards the turbine.

[0103] The side of the fixed block 1 is provided with a guide groove 1-1, and the side of the reinforcing block 2 is provided with a connecting block 2-1 corresponding to the guide groove 1-1. The reinforcing block 2 and the fixed block 1 are fixed by the guide groove 1-1 and the connecting block 2-1 to ensure that the fixed block 1 and the reinforcing block 2 will not shift laterally when sliding. The clamping force of the fixed block 1 and the reinforcing block 2 on the double flange surface is the same.

[0104] When the reinforcing block 2 moves along the guide groove 1-1, the staff applies force to move the reinforcing block 2 along the guide groove 1-1.

[0105] The guide groove 1-1 has a depth of 13mm and a width of 32mm. The connecting block 2-1 has a width of 32mm and a height of 10mm. The width of the guide groove 1-1 is the same as the width of the connecting block 2-1, forming a zero-clearance fit to ensure a stable connection between the fixing block 1 and the reinforcing block 2, and to prevent lateral displacement between them. The depth of the guide groove 1-1 is greater than the height of the connecting block 2-1, meaning there is a 3mm gap between the guide groove 1-1 and the connecting block 2-1. This simplifies the contact area from "three-dimensional surface contact" to "two-dimensional planar contact," ensuring a stable connection between the fixing block 1 and the reinforcing block 2 while reducing the friction caused by the sliding of the connecting block 2-1 within the guide groove 1-1.

[0106] Furthermore, the 3mm distance allows the gap between the guide groove 1-1 and the connecting block 2-1 to be reduced as needed, meaning that minor errors in the connecting block 2-1 are permissible. Even with minor errors in the manufacturing process, the two can still assemble smoothly, avoiding jamming caused by rigid fit and reducing on-site installation difficulty. A balance is achieved between preventing misalignment in width and reducing friction in depth through a geometric strategy of maintaining the same width and leaving a gap in depth.

[0107] In another embodiment,

[0108] The reinforcing block 2 is provided with a connecting hole 2-2, and a fastening bolt 2-3 is provided in the bolt hole. A nut 2-4 is provided at the end of the fastening bolt 2-3. A through hole is provided starting from the side of the reinforcing block 2, and the fastening bolt 2-3 is provided in the through hole. At the same time, an internal thread corresponding to the external thread of the fastening bolt 2-3 is provided on the inside of the through hole. By tightening the fastening bolt 2-3 and inserting it into the connecting hole 2-2, the reinforcing block 2 can be moved towards the inside of the turbine, so that the reinforcing block 2, the top cover side flange plate 4, and the fixing block 1 are pressed together.

[0109] In another embodiment,

[0110] The connecting hole 2-2 is circular to fit the shape of the fastening bolt 2-3. The center of the connecting hole 2-2 coincides with the center point of the cross-section of the reinforcing block 2, ensuring that the force is consistent in all directions, both vertically and horizontally. This evenly distributes the force from the fastening bolt 2-3 at the center point to all parts, ensuring balanced force on the reinforcing block 2 during tightening and preventing deformation or damage due to localized stress concentration. This effectively improves the overall stability and service life of the reinforcing block 2, preventing potential problems such as loosening and cracking caused by uneven stress.

[0111] Based on the actual dimensions on site, the distance between the center of connecting hole 2-2 and the upper and lower edges of the fixing hole is 55mm, and the distance between the center of connecting hole 2-2 and the left and right edges of the fixing hole is 55mm. This ensures the overall usability of the device.

[0112] In another embodiment,

[0113] Connecting hole 2-2 includes a 50mm threaded hole 2-2-1 and a 105mm through hole 2-2-2. The fastening bolt 2-3 does not engage with the wall of the through hole 2-2-2; it only serves for positioning and passage. The fastening bolt 2-3 engages with the wall of the threaded hole 2-2-1 through threaded engagement, generating axial preload and pushing the reinforcing block 2 to move. The nominal diameter of the threaded hole 2-2-1 is 30mm, and the diameter of the through hole 2-2-2 is 32mm, with a 2mm gap to ensure that the fastening bolt 2-3 can be smoothly inserted into the connecting hole 2-2. The fastening bolt 2-3 is inserted from one side of the through hole 2-2-2, passes through the through hole 2-2-2, and is then screwed into the threaded hole 2-2-1, forming a combined connection of through hole 2-2-2 guiding and threaded fastening.

[0114] In another embodiment,

[0115] Both the fixing block 1 and the reinforcing block 2 have a welding cut surface 5 on the side near the edge of the plate. The welding cut surface 5 is located on the side where they contact the plate. That is, a triangular prism with an isosceles right-angled triangle cross-section is cut out near the position to be welded on the plate. This solves the problem of potential weld seams at the bottom when the reinforcing block 2 and fixing block 1 are directly welded during installation. By cutting off the corners corresponding to the welding point, the wedge plate can be installed deeper. In addition, the welding cut surface 5 also serves to release welding stress.

[0116] In another embodiment,

[0117] The welding cut surface 5 of the fixing block 1 and the reinforcing block 2 have the same structure. The welding cut surface 5 is formed by cutting the internal area of ​​the fixing block 1 on four edge lines with a vertical distance of 25mm from the edge line, with a 25mm equal width bevel.

[0118] In another embodiment,

[0119] like Figures 13-20 As shown, to address the actual working conditions on site, the reinforcement component 7 is equipped with pre-drilled holes 6 for placing connecting pins. The turbine structure is complex, with various components, pipes, and connectors interwoven. To accommodate the actual site conditions, pre-drilled holes 6 for placing connecting pins are provided. Different structures of reinforcement components 7 are selected based on the specific circumstances. When space is sufficient and there are no obstructions, the most basic reinforcement component 7 is chosen. When there are structures with similar shapes, such as connecting pins, the reinforcement component 7 with pre-drilled holes 6 is selected, allowing the connecting pins to be embedded within the pre-drilled holes 6, thus preventing interference between components.

[0120] In addition, reinforcement components 7 with corresponding structures can be set according to the other components on the turbine. Without the need for additional modifications to the on-site structure of the turbine, the flexible design of the reinforcement components 7 can meet the needs of different working conditions. This avoids the need for temporary cutting or drilling of the foundation reinforcement components 7 to avoid existing components on the turbine, ensuring that the mechanical properties of the reinforcement components 7 are not damaged and reducing installation difficulties caused by on-site conditions.

[0121] In addition to connecting pins, turbines may have other unique components, such as positioning keys and observation probes. For these components, prefabricated holes 6 or grooves with corresponding structures can be customized to design a series of reinforcement components 7, further expanding their application scenarios. Selecting appropriate reinforcement components 7 based on actual site conditions provides a comprehensive solution for reinforcing the turbine's double-plate top cover flange structure under complex operating conditions. This ensures reinforcement effectiveness while improving the flexibility of the installation process, enhancing the economy and safety of reinforcing the turbine's double-plate top cover flange structure.

[0122] In another embodiment,

[0123] The reinforcement component 7 is made of low-carbon steel. Low-carbon steel has excellent plasticity and toughness, which can absorb the vibration and impact energy generated during the operation of the water turbine through moderate deformation, thus avoiding rigid fracture; its strength is moderate, which can also meet the requirements for reinforcement support.

[0124] In addition to the advantages mentioned above, low-carbon steel also has the following advantages corresponding to the use of the device of the present invention.

[0125] 1. It has excellent welding performance and is easy to cut, making it easy to fix it stably to the turbine flange plate by welding;

[0126] 2. Drilling is easy, facilitating the processing of pre-drilled holes 6 and other related structures, and adapting to the serialized design of the device of this invention;

[0127] 3. Low maintenance cost; localized damage can be repaired by welding.

[0128] 4. The coefficient of thermal expansion is close to that of commonly used materials in water turbines, avoiding thermal stress conflicts and ensuring strong structural stability.

[0129] In another embodiment,

[0130] The contact surfaces of the guide groove 1-1 and the connecting block 2-1 are coated with a hard ceramic coating, which can significantly extend the service life of the friction surface and reduce the increase in gap and structural loosening caused by wear.

[0131] A method for installing a reinforcement device for a double-plate flange top cover structure of a water turbine includes the following specific steps:

[0132] S1: Based on the actual site conditions, select a suitable reinforcement component 7, place the fixing block 1 and the reinforcement block 2 between the double-plate flanges, and push the reinforcement block 2 along the guide groove 1-1 through the connecting block 2-1. The double plate flanges will then position the reinforcement component 7.

[0133] S2: Weld the fixing block 1 to the side of the flange plate 3 on the seat ring side. During the welding process, welding deformation must be prevented.

[0134] S3: Tighten the fastening bolts 2-3 to the standard torque to drive the reinforcing block 2 forward along the guide groove 1-1, so that the pre-tightening of the reinforcing block 2 can be quantitatively controlled in the narrow space; thus, the reinforcing plate, the top cover side flange plate 4, and the fixing block 1 are pressed together.

[0135] S4: Check whether the gaps between the fixing block 1 and the seat ring side flange plate 3, the fixing block 1 and the reinforcing block 2, and the reinforcing block 2 and the top cover side flange plate 4 are qualified.

[0136] S5: After inspection and approval, weld the reinforcing block 2 to the side of the top cover flange plate 4. During the welding process, prevent welding deformation.

[0137] S6: After welding is completed, all welds shall be inspected for defects.

[0138] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0139] Many other changes and modifications can be made without departing from the concept and scope of this invention. It should be understood that this invention is not limited to the specific embodiments, and the scope of this invention is defined by the appended claims.

Claims

1. A reinforcement device for the double-plate flange top cover structure of a water turbine, Its features are, The device includes a reinforcement assembly (7) consisting of multiple sets of reinforcement components (7) fixed between the double-plate flanges. The reinforcement components (7) are fixed between two top cover bottom ring connecting bolts (8). The reinforcement component (7) includes a fixing block (1) and a reinforcement block (2), wherein the reinforcement block (2) is fixed to the side of the fixing block (1). The fixing block (1) is fixed to the side of the seat ring side flange plate (3) by spot welding and intermittent welding. The reinforcing block (2) is fixed to the side of the top cover side flange plate (4) by spot welding and intermittent welding. The longitudinal section of both the fixing block (1) and the reinforcing block (2) is a right trapezoid, and the cross section of both the fixing block (1) and the reinforcing block (2) is a rectangle. The fixing block (1) has a guide groove (1-1) on its side, and the reinforcing block (2) has a connecting block (2-1) on its side corresponding to the guide groove (1-1). The reinforcing block (2) and the fixing block (1) are fixed by the guide groove (1-1) and the connecting block (2-1). A miniature pressure sensor is provided at the bottom of the fixed block (1), and the miniature pressure sensor is connected to a display and a buzzer alarm.

2. The turbine double-plate flange top cover structure reinforcement device as described in claim 1, Its features are, The reinforcing block (2) is provided with a connecting hole (2-2), a fastening bolt (2-3) is provided in the bolt hole, and a nut (2-4) is provided at the end of the fastening bolt (2-3). The connecting hole (2-2) is circular, and the center of the connecting hole (2-2) coincides with the center point of the cross section of the reinforcing block (2).

3. The turbine double-plate flange top cover structure reinforcement device as described in claim 2, Its features are, The longitudinal cross-sectional dimensions of the reinforcing block (2) are: top bottom 112.18mm, bottom bottom 120.22mm, and height 155mm. The dimensions of the longitudinal section of the fixing block (1) are: upper base 109mm, lower base 118.6mm, and height 185mm. The width of the cross-section of the reinforcing block (2) and the width of the cross-section of the fixing block (1) are both 70 mm. The guide groove (1-1) has a depth of 13mm and a width of 32mm. The width of the connecting block (2-1) is 32mm, and the height of the connecting block (2-1) is 10mm. The distance between the center of the connecting hole (2-2) and the upper and lower edges of the fixing hole is 55mm, and the distance between the center of the connecting hole (2-2) and the left and right edges of the fixing hole is 55mm.

4. The turbine double-plate flange top cover structure reinforcement device as described in claim 3, Its features are, The connecting hole (2-2) includes a 50mm threaded hole (2-2-1) and a 105mm through hole (2-2-2). The nominal diameter of the threaded hole (2-2-1) is 30mm, and the diameter of the through hole (2-2-2) is 32mm.

5. A reinforcement device for the double-plate flange top cover structure of a water turbine as described in claim 1. Its features are, Both the fixing block (1) and the reinforcing block (2) have a welding cut surface (5) on the side near the edge of the plate, and the welding cut surface (5) is located on the side of the two blocks that contact the plate.

6. A reinforcement device for the double-plate flange top cover structure of a water turbine as described in claim 5. Its features are, The welding cross-section (5) of the fixing block (1) and the reinforcing block (2) has the same structure. The welding cut surface (5) is formed by cutting the internal area of ​​the fixed block (1) along four edges that are 25mm away from the edge line, with the edge line as the reference.

7. A reinforcement device for the double-plate flange top cover structure of a water turbine as described in claim 1. Its features are, The reinforcing component (7) is provided with pre-drilled holes (6) for placing connecting pins.

8. The turbine double-plate flange top cover structure reinforcement device as described in claim 1, Its features are, The reinforcement component (7) is made of low-carbon steel.

9. A reinforcement device for the double-plate flange top cover structure of a water turbine as described in claim 1. Its features are, The contact surfaces of the guide groove (1-1) and the connecting block (2-1) are both coated with a hard ceramic coating.

10. An installation method for a reinforcement device for a double-plate flange top cover structure of a water turbine. The turbine double-plate flange top cover structure reinforcement device as described in any one of claims 1-9 is adopted. Its features are, Includes the following steps: S1: Based on the actual site conditions, select a suitable reinforcement component (7), place the fixing block (1) and the reinforcement block (2) between the double-plate flange, and push the reinforcement block (2) along the guide groove (1-1) through the connecting block (2-1). The double plate flange positions the reinforcement component (7). S2: Weld the fixing block (1) to the side of the seat ring side flange plate (3). S3: Tighten the fastening bolts (2-3) to the standard torque to drive the reinforcing block (2) to press together with the top cover side flange plate (4) and the fixing block (1) along the guide groove (1-1). S4: Check whether the gaps between the fixing block (1) and the seat ring side flange plate (3), the fixing block (1) and the reinforcing block (2), and the reinforcing block (2) and the top cover side flange plate (4) are qualified. S5: After inspection and approval, weld the reinforcing block (2) to the side of the top cover side flange plate (4). S6: After welding is completed, all welds shall be inspected for defects.

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