Block structure for crack modification of runner blade of mixed-flow water turbine

Abstract

The utility model discloses a block structure for mixed-flow water turbine runner blade crack modification, which belongs to the technical field of surface engineering and is characterized by comprising a connecting ring, a clamping mechanism is slidably connected to the inner side of the connecting ring, and a connecting mechanism is fixedly connected to the bottom of the connecting ring. The clamping mechanism can improve the efficiency of quickly mounting and dismounting the block structure by a user, the block structure can be dismounted by reverse operation when the block structure needs to be dismounted, the operation process is simple and convenient, the mounting and dismounting efficiency of the block structure is effectively improved when the runner blade is subjected to crack modification, and the connecting mechanism ensures that the block structure is tightly attached to the blade by virtue of the adsorption force of the connecting mechanism. The method provides a solid foundation for follow-up crack modification operation, is also beneficial for maintaining the correct position of the whole block structure on the blade, prevents displacement caused by external force, and can be applied to some parts with uneven surfaces or the adsorption force of the magnetic suction ring possibly affected.

Description

Technical Field

[0001] The utility model relates to the technical field of surface engineering, in particular to a block structure used for repairing cracks in Francis turbine runner blades. Background Art

[0002] The turbine runner is a key component that converts water energy into mechanical energy. The accuracy of its blade profile is an important factor affecting the efficiency, output, cavitation and service life of the turbine, and is an important indicator of the turbine manufacturing level.

[0003] The internal wear of the axis of rotation of the runner blades of the existing Francis turbine is large, and it is inconvenient to install the internal bearings, which is not conducive to long-term use. Secondly, the lower bracket part also rotates at high speed with the blades, which is large in wear and poor in durability. Therefore, the staff in this field proposed a runner blade for a Francis turbine;

[0004] The existing patent (publication number: CN217107289U) is a runner blade for a mixed flow turbine, which relates to the technical field of rotor blades, including an upper bracket, a lower bracket is provided at the lower end of the upper bracket, a blade body is provided between the lower bracket and the upper bracket, the outer surface of the upper bracket is provided with a hollow column, the interior of the hollow column is provided with an inner rotating structure, the outer surface of the lower bracket is provided with an outer rotating structure, the inner rotating structure includes a support plate provided on the outer surface of the inner wall of the hollow column, the outer surface of the inner wall of the hollow column is provided with an outer limit strip near the upper end of the support plate, and the upper end of the support plate is provided with a bearing. The utility model solves the problem that the internal wear of the rotating axis of the rotor blades of the existing mixed flow turbine is large, and it is inconvenient to install the internal bearing, which is not conducive to long-term use, and the lower bracket part also rotates at high speed with the blade, resulting in large wear and poor durability.

[0005] In response to the above problems, the existing patent provides a solution, but it lacks a structure for locating and repairing cracks on the surface of the runner blades of the Francis turbine. As a result, when repairing cracks on the surface of the runner blades, the user needs to hold the repair tools and repair blocks for welding repairs, which makes it difficult to maintain a stable operating posture, thereby affecting the welding quality.

[0006] Therefore, a block structure for crack repair of Francis turbine runner blades is proposed. Utility Model Content

[0007] The purpose of the utility model is to provide a block structure for repairing cracks in the runner blades of a Francis turbine, which can solve the problem that the existing surface engineering lacks a structure for positioning and repairing cracks on the surface of the runner blades of the Francis turbine, resulting in the user needing to hold the repair tool and the repair block for welding repair when repairing the cracks on the surface of the runner blades, making it difficult to maintain a stable operating posture, thereby affecting the welding quality.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a block structure for crack repair of Francis turbine runner blades, comprising a connecting ring, the inner side of which is slidably connected to a clamping mechanism, and the bottom of which is fixedly connected to a connecting mechanism;

[0009] The locking mechanism includes a plurality of sliding grooves, a slider, a connecting rod, a limiting ring, a plurality of rotating grooves, a plurality of torsion springs, a plurality of blocking rods and a push rod. The sliding groove is opened at the top of the inner side of the connecting ring, the slider is slidably connected to the inner side of the sliding groove, the top of the connecting rod is fixedly connected to the surface of the slider, the limiting ring is slidably connected to the inner side of the connecting ring, the bottom of the connecting rod is fixedly connected to the top of the limiting ring, the rotating groove is opened at the inner side of the limiting ring, the torsion spring is fixedly connected to both sides of the surface of the blocking rod, and the side of the torsion spring away from the blocking rod is respectively rotatably connected to both sides of the top of the inner side of the rotating groove and both sides of the bottom of the inner side of the rotating groove, the blocking rod is rotatably connected to the inner side of the rotating groove, and the push rod is fixedly connected to the top of the slider.

[0010] Preferably, the connecting mechanism includes a magnetic ring, a fixing ring, two micro air pumps, a plurality of air delivery pipes and a plurality of adsorption heads, and the top of the magnetic ring is fixedly connected to the bottom of the limiting ring.

[0011] Preferably, the fixing ring is fixedly connected to the surface of the connecting ring, and the micro air pump is fixedly connected to both sides of the top of the fixing ring.

[0012] Preferably, the top of the gas pipe is fixedly connected to the bottom of the fixing ring, the bottom of the gas pipe passes through the connecting ring and is fixedly connected to the top of the adsorption head, and the adsorption head is fixedly connected to the bottom of the connecting ring.

[0013] Preferably, the blocking rod at the bottom inner side of the rotation groove is set as a long blocking rod, and the blocking rod at the top inner side of the rotation groove is set as a short blocking rod.

[0014] Preferably, a protective sleeve is fixedly connected to the top of the push rod, and the surface of the protective sleeve is engraved with anti-slip patterns.

[0015] Preferably, a sealing ring is fixedly connected to the bottom of the micro air pump, and a side of the sealing ring away from the micro air pump is fixedly connected to the top of the fixing ring.

[0016] Preferably, the adsorption surface of the magnetic ring is engraved with anti-slip lines, and the adsorption surface of the magnetic ring is coated with a waterproof coating.

[0017] Preferably, the adsorption head is made of silicone material, and the bottom of the adsorption head is engraved with anti-slip lines.

[0018] Preferably, the surface of the blocking rod is covered with a protective cover, and the surface of the protective cover is coated with anti-corrosion paint.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The clamping mechanism of the present application can facilitate the user to quickly install and disassemble the block structure. When disassembly is required, the reverse operation is sufficient. The operation process is simple and convenient, which effectively improves the efficiency of installing and disassembling the block structure when performing crack repair on the runner blade.

[0021] 2. The connection mechanism of the present application ensures that the block structure fits tightly to the blade by virtue of its adsorption force, providing a solid foundation for subsequent crack repair operations. It also helps to maintain the correct position of the entire block structure on the blade to prevent displacement due to external forces. In addition, in some areas where the surface is not very flat or the adsorption force of the magnetic ring may be affected, negative pressure adsorption can play a good supplementary role, ensuring that the block structure can be reliably adsorbed at all parts of the blade, thereby improving the stability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall structural diagram of the block structure used for crack repair of Francis turbine runner blades according to the present invention;

[0023] Figure 2 This is the overall structural diagram of the clamping mechanism of the utility model;

[0024] Figure 3 This is the overall structural diagram of the connecting mechanism of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the protective cover of the utility model;

[0026] Figure 5 This is a schematic structural diagram of the protective cover of the utility model.

[0027] In the figure, 1. connecting ring; 2. clamping mechanism; 21. slide groove; 22. slider; 23. connecting rod; 24. limiting ring; 25. rotating groove; 26. torsion spring; 27. blocking rod; 28. push rod; 3. connecting mechanism; 31. magnetic ring; 32. fixing ring; 33. micro air pump; 34. air supply pipe; 35. adsorption head; 4. protective cover; 5. sealing ring; 6. protective cover. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-5 , this utility model provides a technical solution:

[0030] A block structure for crack repair of Francis turbine runner blades, comprising a connecting ring 1, a clamping mechanism 2 being slidably connected to the inner side of the connecting ring 1, and a connecting mechanism 3 being fixedly connected to the bottom of the connecting ring 1;

[0031] The clamping mechanism 2 includes several slide grooves 21, sliders 22, connecting rods 23, limiting rings 24, several rotating grooves 25, several torsion springs 26, several blocking rods 27 and push rods 28. The slide groove 21 is opened at the top of the inner side of the connecting ring 1, the slider 22 is slidably connected to the inner side of the slide groove 21, the top of the connecting rod 23 is fixedly connected to the surface of the slider 22, the limiting ring 24 is slidably connected to the inner side of the connecting ring 1, the bottom of the connecting rod 23 is fixedly connected to the top of the limiting ring 24, the rotating groove 25 is opened on the inner side of the limiting ring 24, the torsion spring 26 is fixedly connected to the two sides of the surface of the blocking rod 27, and the side of the torsion spring 26 away from the blocking rod 27 is respectively rotatably connected to the two sides of the top inside the rotating groove 25 and the two sides of the bottom inside the rotating groove 25, the blocking rod 27 is rotatably connected to the inner side of the rotating groove 25, and the push rod 28 is fixedly connected to the top of the slider 22.

[0032] In the embodiment, the connecting ring 1 can support and limit the clamping mechanism 2 and the connecting mechanism 3, the sliding groove 21 can limit the sliding direction of the sliding block 22, and the sliding block 22 can move along the predetermined path, when the sliding block 22 slides in the sliding groove 21, the connecting rod 23 can move synchronously, and then the limiting ring 24 can slide in the inside of the connecting ring 1, finally the position state of the blocking rod 27 in the rotating groove 25 can be affected, when the sliding block 22 is pushed by the push rod 28, the connecting rod 23 can stably transmit the force to the limiting ring 24, the limiting ring 24 can move in the expected direction and amplitude, the limiting ring 24 provides an installation carrier for the rotating groove 25, so that the rotating groove 25 and the blocking rod 27 and other components installed therein can move in a relatively fixed space, the rotating groove 25 provides a special rotating space for the blocking rod 27, so that the blocking rod 27 can rotate around a specific shaft in the rotating groove 25, when the blocking rod 27 rotates around the rotating groove 25 due to external force during the installation or disassembly of the block structure, the torsional spring 26 will be elastically deformed, once the external force disappears, the torsional spring 26 will quickly pull the blocking rod 27 back to the initial position or restore it to the clamping state, when the user puts the block structure into the inside of the limiting ring 24, the blocking rod 27 can be clamped and fixed by the torsional spring 26, so that the block structure is prevented from shaking, the push rod 28 provides an intuitive and convenient operation interface for the operator, the operator only needs to push the push rod 28 to easily transmit the force to the sliding block 22, and then a series of linkage actions of the clamping mechanism 2 are triggered to adjust the position of the blocking rod 27.

[0033] Specifically, as shown in Figure 3 The connecting mechanism 3 includes a magnetic ring 31, a fixed ring 32, two micro air pumps 33, a plurality of gas pipes 34 and a plurality of adsorption heads 35, and the top of the magnetic ring 31 is fixedly connected to the bottom of the limiting ring 24.

[0034] Specifically, as shown in Figure 3 The fixed ring 32 is fixedly connected to the surface of the connecting ring 1, and the micro air pumps 33 are fixedly connected to the top of the fixed ring 32 on both sides.

[0035] Specifically, as shown in Figure 3 The top of the gas pipe 34 is fixedly connected to the bottom of the fixed ring 32, the bottom of the gas pipe 34 penetrates through the connecting ring 1 and is fixedly connected to the top of the adsorption head 35, and the adsorption head 35 is fixedly connected to the bottom of the connecting ring 1.

[0036] In this embodiment: by setting up a magnetic attraction ring 31 and utilizing the magnetic principle, an adsorption force can be generated on the surface of the runner blade. For runner blades made of ferromagnetic materials, it can be firmly adsorbed on the blade surface. The fixing ring 32 can support and limit the micro air pump 33 and the air pipe 34. The micro air pump 33 transports gas to the adsorption head 35 through the air pipe 34, so that a negative pressure environment is formed inside the adsorption head 35, thereby generating suction. The air pipe 34 establishes a gas transmission channel between the micro air pump 33 and the adsorption head 35. Through the air pipe 34, the micro air pump 33 can accurately transport the extracted gas to the adsorption head 35, so that a negative pressure environment can be formed inside the adsorption head 35, thereby generating suction. The adsorption head 35 generates suction through the negative pressure environment formed inside. These suction forces work together to enhance the adsorption force of the block structure in the local area on the runner blade.

[0037] Specifically, such as Figure 2 As shown, the blocking rod 27 at the bottom inner side of the rotation groove 25 is set as a long blocking rod 27, and the blocking rod 27 at the top inner side of the rotation groove 25 is set as a short blocking rod 27.

[0038] Specifically, such as Figure 4 As shown, the top of the push rod 28 is fixedly connected to a protective sleeve 4, and the surface of the protective sleeve 4 is engraved with anti-slip lines.

[0039] In this embodiment: by setting the blocking rod 27 at the bottom inner side of the rotating groove 25 to be a long blocking rod 27, the long blocking rod 27 can provide a larger clamping contact area when clamping with the block structure, and by setting the blocking rod 27 at the top inner side of the rotating groove 25 to be a short blocking rod 27, higher flexibility can be achieved when clamping with the block structure. By setting the protective cover 4, the protective cover 4 provides the operator with a better grip feel when pushing the push rod 28. By setting the anti-slip texture, the friction between the hand and the protective cover 4 is increased to prevent the hand from slipping during the pushing process.

[0040] Specifically, such as Figure 4 As shown, a sealing ring 5 is fixedly connected to the bottom of the micro air pump 33 , and a side of the sealing ring 5 away from the micro air pump 33 is fixedly connected to the top of the fixing ring 32 .

[0041] Specifically, such as Figure 3 As shown, the adsorption surface of the magnetic ring 31 is engraved with anti-slip lines, and the adsorption surface of the magnetic ring 31 is coated with a waterproof coating.

[0042] In this embodiment: by providing a sealing ring 5, gas is effectively prevented from leaking from the bottom of the micro air pump 33, ensuring the gas sealing of the micro air pump 33 during operation; by providing the adsorption surface of the magnetic ring 31 with anti-slip grooves, the friction between the magnetic ring 31 and the surface of the runner blade can be increased; by providing a waterproof coating, impurities, chemicals, etc. in the water flow are prevented from corroding or damaging the material of the magnetic ring 31, thereby extending the service life of the magnetic ring 31.

[0043] Specifically, such as Figure 3 As shown, the adsorption head 35 is made of silicone material, and the bottom of the adsorption head 35 is engraved with anti-slip lines.

[0044] Specifically, such as Figure 5 As shown, the surface of the blocking rod 27 is covered with a protective cover 6, and the surface of the protective cover 6 is coated with anti-corrosion paint.

[0045] In this embodiment: by setting the adsorption head 35 to be made of silicone material, the silicone material has good flexibility and sealing properties, and its flexibility enables the adsorption head 35 to adaptively deform according to the shape and concave-convex conditions of the surface of the runner blade. Even if there are some uneven areas on the blade surface, the adsorption head 35 can better fit the blade surface through its own deformation. By setting anti-slip patterns, the friction between the adsorption head 35 and the surface of the runner blade can be increased. By setting the protective cover 6, the blocking rod 27 is prevented from being corroded, the service life of the blocking rod 27 is extended, and the normal operation of the clamping mechanism 2 is ensured. By setting anti-corrosion coating, in the turbine operating environment, water and impurities in the water may cause corrosion to the blocking rod 27, and the protective cover 6 and the anti-corrosion coating on its surface can effectively resist such corrosion.

[0046] Working principle: First, the user places the block structure specially used for repair above the blocking rod 27, and then slowly pushes the block structure downward. During this process, the block structure will prompt the blocking rod 27 to rotate downward around the torsion spring 26, and as the blocking rod 27 rotates, it can form a snap-fit ​​relationship with the block structure, thereby preliminarily fixing the position of the block structure. Then, after the block structure completes the snap-fit ​​operation with the blocking rod 27, the user needs to align the connecting ring 1 with the part of the runner blade surface where there is a crack and needs to be repaired, so that the bottom of the connecting ring 1 can be aligned with the runner. The surface of the runner blade is in smooth contact. After that, the user pushes the push rod 28. After the push rod 28 is subjected to force, it drives the slider 22 connected to it to move to one side of the surface of the runner blade. When the slider 22 moves, the transmission effect of the connecting rod 23 drives the limiting ring 24 to move synchronously on the inner side of the connecting ring 1. During the movement, the limiting ring 24 further drives the blocking rod 27 connected to it and the entire block structure to gradually approach and move toward the surface of the runner blade. When the bottom of the connecting ring 1 is in full contact with the surface of the runner blade, the bottom of the connecting ring 1 is in full contact with the surface of the runner blade. The magnetic ring 31 will quickly and tightly adsorb to the surface of the runner blade by virtue of its own magnetism, achieving a preliminary fixing effect. After the magnetic ring 31 completes the adsorption and fixation, the user turns on the power and starts the two micro air pumps 33. After the micro air pumps 33 start working, they will deliver gas to the adsorption head 35 through the air pipe 34, so that a negative pressure environment is formed inside the adsorption head 35, thereby generating suction, so that the adsorption head 35 can be firmly adsorbed on the surface of the runner blade, further enhancing the connection stability between the entire block structure and the runner blade. After the blade surface is completely fixed, the user can loosen the connecting ring 1. At this time, the user can carry out welding repair work on the cracked parts of the block structure and the surface of the runner blade. Finally, after completing the repair work on the crack, the user first turns off the micro air pump 33 to stop it from working. Then, only a certain external force is needed to smoothly separate the connecting ring 1 from the surface of the runner blade. After completing the separation operation, the user pulls the push rod 28 to make the push rod 28 drive the relevant components to return to the initial position so that the repair device can be used again for repair work later.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A block structure for crack repair of Francis turbine runner blades, comprising a connecting ring (1), characterized in that: The inner side of the connecting ring (1) is slidably connected to a clamping mechanism (2), and the bottom of the connecting ring (1) is fixedly connected to a connecting mechanism (3); The clamping mechanism (2) comprises a plurality of slide grooves (21), a slider (22), a connecting rod (23), a limiting ring (24), a plurality of rotating grooves (25), a plurality of torsion springs (26), a plurality of blocking rods (27) and a push rod (28), wherein the slide groove (21) is provided at the top of the inner side of the connecting ring (1), the slider (22) is slidably connected to the inner side of the slide groove (21), the top of the connecting rod (23) is fixedly connected to the surface of the slider (22), the limiting ring (24) is slidably connected to the inner side of the connecting ring (1), and the connecting rod (23) is fixedly connected to the surface of the slider (22). The bottom of the connecting rod (23) is fixedly connected to the top of the limiting ring (24), the rotating groove (25) is opened on the inner side of the limiting ring (24), the torsion spring (26) is fixedly connected to both sides of the surface of the blocking rod (27), the side of the torsion spring (26) away from the blocking rod (27) is respectively rotatably connected to both sides of the top inside the rotating groove (25) and both sides of the bottom inside the rotating groove (25), the blocking rod (27) is rotatably connected to the inner side of the rotating groove (25), and the push rod (28) is fixedly connected to the top of the slider (22).

2. The block structure for crack repair of Francis turbine runner blades according to claim 1, characterized in that: The connecting mechanism (3) comprises a magnetic ring (31), a fixing ring (32), two micro air pumps (33), a plurality of air delivery pipes (34) and a plurality of adsorption heads (35); the top of the magnetic ring (31) is fixedly connected to the bottom of the limiting ring (24).

3. The block structure for crack repair of Francis turbine runner blades according to claim 2, characterized in that: The fixing ring (32) is fixedly connected to the surface of the connecting ring (1), and the micro air pump (33) is fixedly connected to both sides of the top of the fixing ring (32).

4. The block structure for crack repair of Francis turbine runner blades according to claim 2, characterized in that: The top of the gas delivery pipe (34) is fixedly connected to the bottom of the fixing ring (32), the bottom of the gas delivery pipe (34) passes through the connecting ring (1) and is fixedly connected to the top of the adsorption head (35), and the adsorption head (35) is fixedly connected to the bottom of the connecting ring (1).

5. The block structure for crack repair of Francis turbine runner blades according to claim 1, characterized in that: The blocking rod (27) at the bottom of the inner side of the rotating groove (25) is set as a long blocking rod (27), and the blocking rod (27) at the top of the inner side of the rotating groove (25) is set as a short blocking rod (27).

6. The block structure for crack repair of Francis turbine runner blades according to claim 1, characterized in that: The top of the push rod (28) is fixedly connected to a protective sleeve (4), and the surface of the protective sleeve (4) is engraved with anti-slip lines.

7. The block structure for crack repair of Francis turbine runner blades according to claim 2, characterized in that: A sealing ring (5) is fixedly connected to the bottom of the micro air pump (33), and a side of the sealing ring (5) away from the micro air pump (33) is fixedly connected to the top of the fixing ring (32).

8. The block structure for crack repair of Francis turbine runner blades according to claim 2, characterized in that: The adsorption surface of the magnetic attraction ring (31) is engraved with anti-slip lines, and the adsorption surface of the magnetic attraction ring (31) is coated with a waterproof coating.

9. The block structure for crack repair of Francis turbine runner blades according to claim 2, characterized in that: The adsorption head (35) is made of a silica gel material, and the bottom of the adsorption head (35) is engraved with anti-slip lines.

10. The block structure for crack repair of Francis turbine runner blades according to claim 1, characterized in that: The surface of the blocking rod (27) is covered with a protective sleeve (6), and the surface of the protective sleeve (6) is coated with an anti-corrosion paint.

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