A snap-fit ​​sealing ring for use on the blades of a bulb-type hydro turbine generator.

Abstract

This utility model discloses a snap-on sealing ring applied to the blade of a bulb-type hydro turbine generator, relating to the field of sealing structure technology. It includes a bulb-type hydro turbine generator, with a snap-on blade seal installed on the blade. Specifically, the installation location is the sealing groove between the blade root and the hub. The snap-on blade seal is inserted into the sealing groove and tightly fitted. The snap-on blade seal is composed of several sealing units that are interlocked. In this solution, the snap-on blade seal is composed of two sealing units, which are interlocked end-to-end to form a ring-shaped sealing structure.

Description

Technical Field

[0001] This utility model belongs to the field of sealing structure technology, and specifically relates to a snap-on sealing ring applied to the blade of a bulb-type hydro turbine generator. Background Technology

[0002] Against the backdrop of a global push for clean energy development, hydropower, as a clean and renewable energy source, occupies an important position. Bulb turbine generators, with their high water energy conversion efficiency and unique structural design, are widely used in various small and medium-sized hydropower stations. However, the maintenance and replacement of blade seals during their long-term stable operation remains a critical challenge that urgently needs to be addressed within the industry.

[0003] Traditional continuous ring-shaped blade seals are typically made of elastic rubber material, forming a continuous ring structure. This seal fits tightly within a pre-designed sealing groove between the blade root and the hub, utilizing the material's own elastic deformation to fill the gap and prevent water leakage. The advantage of continuous ring seals lies in their continuous sealing, theoretically providing a relatively reliable sealing effect. However, in practical applications, due to the complex operating environment of hydroelectric turbines, the blades are affected by various factors such as water flow impact and mechanical vibration during high-speed rotation, causing the sealing material to bear significant stress and making it prone to wear and aging. Once the continuous ring seal is damaged, it can easily lead to operating oil leakage, thereby polluting the surrounding aquatic environment, which runs counter to the green and sustainable development concept of the hydropower industry.

[0004] Moreover, when the traditional full-circle blade seal is damaged and needs replacement, the entire operation is extremely complex. First, the hydropower station must stop generating electricity and drain the water from the turbine's flow channel, a process that consumes considerable time and water resources. Then, large lifting equipment, such as gantry cranes and truck cranes, is needed to lift the runner chamber from the main turbine structure. The runner chamber is typically large and heavy, requiring specialized operators and strict safety measures to prevent accidents. After lifting the runner chamber, the runner blades must be disassembled one by one. Each runner blade is connected to the hub by multiple high-strength bolts; disassembly requires specialized tools, such as hydraulic wrenches, and must be performed with extreme care to avoid damaging the connection between the blades and the hub. Only after a series of complex disassembly procedures can the full-circle seal located at the blade root between the blade and the hub be exposed and replaced. After replacement, the runner blades and runner chamber must be reassembled in reverse order, followed by commissioning and trial operation to ensure the turbine returns to normal operation. Utility Model Content

[0005] The purpose of this invention is to provide a snap-fit ​​sealing ring for the blades of a bulb-type hydroelectric generator. This overcomes the traditional full-ring structure and develops a snap-fit ​​blade sealing structure, fundamentally solving the difficulties of traditional seal replacement, reducing construction costs, and effectively avoiding environmental pollution caused by seal damage. This provides a strong guarantee for the safe, efficient, and environmentally friendly operation of the bulb-type hydroelectric generator. The specific technical solution is as follows: A snap-fit ​​sealing ring for use on the blades of a bulb-type hydro turbine generator includes a snap-fit ​​blade seal installed on the blades of the bulb-type hydro turbine generator. The snap-fit ​​blade seal is formed by several sealing units that are interlocked and connected to each other, and the snap-fit ​​blade seal has an annular sealing structure.

[0006] Preferably, the sealing unit includes an arc-shaped segment, a snap-fit ​​groove, and a snap-fit ​​head. The snap-fit ​​groove and the snap-fit ​​head are respectively located at opposite ends of the arc-shaped segment, and the snap-fit ​​head and the snap-fit ​​groove are mutually adapted to each other. Two adjacent sealing units are connected by the cooperation of the snap-fit ​​groove and the snap-fit ​​head.

[0007] Preferably, the contact surfaces of the buckle groove and the buckle head are provided with protective teeth.

[0008] Preferably, V-shaped grooves are provided on both opposite end faces of the arc segment.

[0009] Preferably, the inner and outer circumferential surfaces of the arc segment are provided with arc-shaped grooves.

[0010] Preferably, the sealing lip of the arc-shaped segment is coated with a high-performance lubricant.

[0011] Preferably, the sealing monomer is made of polyurethane.

[0012] Preferably, the cross-section of the arc segment is X-shaped.

[0013] Preferably, the snap-fit ​​blade seal is further provided with several layers of V-shaped seals, which are stacked and embedded in the V-shaped groove.

[0014] Preferably, the V-shaped seal has a V-shaped cross-section.

[0015] Compared with existing technologies, this utility model has the following beneficial effects: 1. This utility model provides a snap-fit ​​sealing ring for use on the blades of a bulb-type axial-flow hydro generator. This snap-fit ​​sealing ring overcomes the traditional whole-ring structure by combining and connecting multiple sealing units to form a complete annular sealing structure. The annular sealing structure is quickly connected at both ends by snap-fit ​​heads and snap-fit ​​grooves, fundamentally solving the dilemma of traditional seal replacement, reducing construction costs, and effectively avoiding environmental pollution caused by seal damage. This provides a strong guarantee for the safe, efficient, and environmentally friendly operation of the bulb-type axial-flow hydro generator.

[0016] 2. The snap-fit ​​sealing ring provided by this utility model has specially processed anti-slip teeth on the contact surface of the snap-fit ​​head and the snap-fit ​​groove. These teeth can increase the friction of the connection part, effectively preventing the snap-fit ​​from loosening due to external forces such as vibration and water flow impact during the operation of the water turbine, thus ensuring the stability and sealing performance of the entire sealing structure.

[0017] 3. The snap-on sealing ring structure provided by this utility model is novel. Under the action of water pressure, the sealing lip on the arc segment is further deformed and fills the gap, effectively preventing water from leaking from the gap between the blade and the hub, ensuring that the water can be concentrated on the blade, driving the rotor to rotate efficiently, and realizing the conversion of water energy into electrical energy. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0019] Figure 1 This is a partial structural schematic diagram of the bulb-type hydro turbine generator of this utility model.

[0020] Figure 2 yes Figure 1 An enlarged diagram of A in the diagram.

[0021] Figure 3 This is a schematic diagram of the snap-fit ​​blade seal structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the cross-section of the sealing unit of this utility model.

[0023] Figure 5 This is a front view of the sealing unit of this utility model.

[0024] Figure 6 This is a schematic cross-sectional view of another combination structure of the sealing unit of this utility model.

[0025] Explanation of key figure labels: 10-Bulb-type axial-flow turbine generator, 20-Snap-on blade seal, 21-Seal unit, 211-Arc-shaped section, 212-Snap-on groove, 213-Snap-on head, 30-V-shaped seal. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0030] Example like Figures 1 to 6As shown, a snap-on sealing ring applied to the blade of a bulb-type hydro turbine generator includes a snap-on blade seal 20 installed on the blade of the bulb-type hydro turbine generator 10. Specifically, the installation position is at the sealing groove between the blade root and the hub. The snap-on blade seal 20 is inserted into the sealing groove and tightly fitted into it. The snap-on blade seal 20 is formed by several sealing units 21 that are interlocked together. In this solution, the snap-on blade seal 20 is composed of two sections of sealing units 21 (the specific number of sections depends on the circumference of the sealing groove, and the number of sealing units 21 can be increased or decreased to form a sealing ring that fits the sealing groove). The two sections of sealing units 21 are interlocked end to end to form an annular sealing structure.

[0031] In some preferred embodiments, the sealing unit 21 includes an arc-shaped segment 211, a snap-fit ​​groove 212, and a snap-fit ​​head 213. The snap-fit ​​groove 212 and the snap-fit ​​head 213 are respectively located at opposite ends of the arc-shaped segment 211, and the snap-fit ​​head 213 is adapted to the snap-fit ​​groove 212. Two adjacent sealing units 21 are connected by the cooperation of the snap-fit ​​groove 212 and the snap-fit ​​head 213. In order to improve the tight and stable connection between the snap-fit ​​head 213 and the snap-fit ​​groove 212 and to avoid the two sealing units 21 from breaking apart during use and affecting the performance, protective teeth are provided on the contact surface of the snap-fit ​​groove 212 and the snap-fit ​​head 213.

[0032] During installation, simply align the end of the snap head 213 with the snap groove 212 of the arc-shaped segment 211, and then securely lock the snap head 213 into the snap groove 212 by simple rotation or pressing. The protective teeth on the contact surface between the snap groove 212 and the snap head 213 increase the friction of the connection, effectively preventing the snap from loosening due to external forces such as vibration and water flow impact during turbine operation. This ensures the stability and sealing of the entire sealing structure and enables a stable and reliable connection between several segments of the sealing unit 21.

[0033] In some preferred embodiments, V-shaped grooves are provided on both opposite end faces of the arc-shaped segment 211. Arc-shaped grooves are also provided on both the inner and outer circumferential surfaces of the arc-shaped segment 211, thus the cross-section of the arc-shaped segment 211 is X-shaped. It is worth noting that these sealing lips (i.e., the two "lips" branching off from the V-shaped grooves) are crucial components that directly contact the water flow and achieve the sealing function; their design is of paramount importance. The sealing lips in this solution employ a special material formula and manufacturing process, and after special treatment, possess excellent water erosion resistance and wear resistance. During the manufacturing process, the surface of the sealing lips undergoes fine processing to achieve an extremely high standard of surface smoothness, thereby reducing friction when water flows through and minimizing wear.

[0034] To further improve the sealing effect, a high-performance lubricating coating is applied to the sealing lip of the arc-shaped segment 211 and the surface in contact with the blade root and the hub sealing groove. This coating not only reduces the coefficient of friction between the sealing lip and the contact surface, reducing wear, but also fills tiny gaps to a certain extent, improving the tightness of the seal. Simultaneously, the lubricating coating also exhibits good chemical stability, maintaining its performance stability in long-term water immersion environments.

[0035] In some preferred embodiments, the sealing monomer 21 is made of polyurethane instead of traditional nitrile rubber. It is worth noting that polyurethane (PU) material has a Shore A hardness of 95A, strong wear resistance, pressure resistance, and aging resistance, and can completely replace traditional rubber materials.

[0036] Preferably, the snap-on paddle seal 20 is further provided with several layers of V-shaped seals 30, which are stacked and embedded in the V-shaped groove, and the cross-section of the V-shaped seal 30 is V-shaped.

[0037] Next, the working principle and replacement method of this embodiment will be described in detail so that those skilled in the art can better understand this utility model: During normal operation of the bulb-type hydro-turbine generator, the high-speed water flow impacts the blades, generating immense pressure that causes each sealing unit 21 of the snap-fit ​​blade seal 20 to tightly adhere to the sealing groove between the blade root and the hub. Under the pressure of the water flow, the sealing lip further deforms and fills the gap, effectively preventing water leakage from the gap between the blade and the hub. This ensures that the water flow is concentrated on the blades, driving the runner to rotate efficiently and converting water energy into electrical energy. When seal replacement is required, maintenance personnel only need to use simple tools to open the snap-fit ​​connection structure on the damaged sealing unit 21. The damaged sealing unit 21 is carefully removed from the sealing groove, and then a new sealing unit 21, after applying an appropriate amount of lubricant, is placed into the sealing groove and reconnected, completing the seal replacement operation. The entire process requires no disassembly of the runner chamber or runner blades, greatly simplifying the maintenance process and shortening maintenance time.

[0038] In summary, this utility model provides a snap-on sealing ring for use on the blades of a bulb-type hydro-generator. This snap-on sealing ring overcomes the traditional whole-ring structure by combining multiple sealing units to form a complete annular sealing structure. Furthermore, the annular sealing structure achieves quick connection at both ends through the insertion of the snap-on head and the snap-on groove, fundamentally solving the dilemma of traditional seal replacement, reducing construction costs, and effectively avoiding environmental pollution caused by seal damage. This provides a strong guarantee for the safe, efficient, and environmentally friendly operation of the bulb-type hydro-generator. The snap-on sealing ring provided by this utility model has specially processed anti-slip teeth on the contact surface of the snap-on head and the snap-on groove. These teeth increase the friction at the connection points, effectively preventing the buckle from loosening due to external forces such as vibration and water flow impact during turbine operation, thus ensuring the stability and sealing of the entire sealing structure. The buckle-type sealing ring structure provided by this utility model is novel. Under the action of water flow pressure, the sealing lip on the arc section further deforms and fills the gap, effectively preventing water from leaking from the gap between the blade and the hub, ensuring that the water flow can be concentrated on the blade, driving the runner to rotate efficiently and realizing the conversion of water energy into electrical energy.

[0039] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A snap-fit ​​sealing ring applied to the blades of a bulb-type cross-flow hydro generator, characterized in that, It includes a snap-fit ​​blade seal (20) installed on the blade of the bulb-type turbine generator (10). The snap-fit ​​blade seal (20) is composed of several sealing units (21) that are snapped together. The snap-fit ​​blade seal (20) has an annular sealing structure.

2. The snap-fit ​​sealing ring applied to the blade of a bulb-type hydroelectric generator according to claim 1, characterized in that, The sealing unit (21) includes an arc-shaped segment (211), a snap-fit ​​groove (212), and a snap-fit ​​head (213). The snap-fit ​​groove (212) and the snap-fit ​​head (213) are respectively located at opposite ends of the arc-shaped segment (211), and the snap-fit ​​head (213) is adapted to the snap-fit ​​groove (212). Two adjacent sealing units (21) are connected by the cooperation of the snap-fit ​​groove (212) and the snap-fit ​​head (213).

3. A snap-fit ​​sealing ring applied to the blade of a bulb-type hydroelectric generator according to claim 2, characterized in that, The contact surfaces of the buckle groove (212) and the buckle head (213) are provided with protective teeth.

4. A snap-fit ​​sealing ring applied to the blade of a bulb-type hydroelectric generator according to claim 2, characterized in that, V-shaped grooves are provided on both opposite end faces of the arc segment (211).

5. A snap-fit ​​sealing ring for use on the blades of a bulb-type hydroelectric generator according to claim 4, characterized in that, The arc-shaped segment (211) has arc-shaped grooves on both its inner and outer circumferential surfaces.

6. A snap-fit ​​sealing ring for use on the blades of a bulb-type hydro-generator according to claim 5, characterized in that, The sealing lip of the arc segment (211) is coated with a high-performance lubricant.

7. A snap-fit ​​sealing ring applied to the blade of a bulb-type hydroelectric generator according to claim 2, characterized in that, The sealing monomer (21) is made of polyurethane.

8. A snap-on sealing ring applied to the blade of a bulb-turbine generator according to claim 2, characterized in that, The arc segment (211) has an X-shaped cross section.

9. The snap-on sealing ring applied to the blade of a bulb tubular hydroelectric generator according to claim 4, characterized in that, The snap-on blade seal (20) is further provided with several layers of V-shaped seals (30), which are embedded in the V-shaped groove in a stacked manner.

10. The snap-on sealing ring applied to the blade of a bulb-turbine generator according to claim 9, characterized in that, The V-shaped seal (30) has a V-shaped cross-section.

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