Hydropower station water turbine blade sealing detection tool and maintenance method

Abstract

This invention discloses a tooling for testing the sealing of turbine blades in hydropower stations and its maintenance method. The tooling includes a blade sleeve, a filling and venting device, and a pressure detector. One side of the blade sleeve has a slot for inserting the turbine blade, and a sealing mechanism is located at the open end of the slot. A testing port is provided on the blade sleeve, communicating with the slot. The filling and venting device connects to the blade sleeve to fill the slot with air, and the pressure detector connects to the testing port to detect the air pressure within the slot. This invention creates a specific pressure environment by filling the blade sleeve with air using the filling and venting device, and then uses the pressure detector to measure the air pressure. This allows for rapid assessment of blade sealing, eliminating the need for the time-consuming and labor-intensive disassembly of the entire turbine for inspection as in traditional methods, thus significantly reducing testing time.

Description

Technical Field

[0001] This invention relates to the field of water turbine maintenance technology, and in particular to a tooling for testing the sealing of water turbine blades in hydropower stations and a maintenance method thereon. Background Technology

[0002] The turbine is one of the core pieces of equipment in a hydropower station, and the sealing performance of the turbine blades is crucial to the normal operation of the entire unit. The most common cause of blade seal failure is not through-cracks, but rather tiny pits, scratches, and aging deformation of the sealing surface caused by long-term water erosion, cavitation, and silt abrasion on the surfaces where the blade and sealing components mate. These minor damages do not affect the structural strength of the blade, but they can lead to increased sealing gaps and leakage.

[0003] Traditional blade seal inspection methods typically require the complete disassembly of the turbine, a time-consuming and complex process that demands significant manpower and resources. Furthermore, traditional methods often fail to complete blade seal and leakage tests within a short timeframe, extending the unit's maintenance period and impacting the hydropower station's power generation efficiency and economic benefits. Therefore, this invention proposes a tooling and inspection method for testing the blade seals of hydropower station turbines to address these issues. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a tooling for testing the sealing performance of turbine blades in hydropower stations, which can test the sealing performance of the blades without disassembling the turbine blades and the seals.

[0005] Another problem that this invention aims to solve is to propose a maintenance method to repair minor damage at the sealing points of turbine blades, thereby improving sealing performance and reducing the risk of leakage.

[0006] To achieve the above objectives, this application provides a tooling for the sealing and maintenance of turbine blades in hydropower stations, including a blade sleeve, a filling and venting device, and a pressure detector. A slot for inserting turbine blades is provided on one side of the blade sleeve, and a sealing mechanism is provided at the open end of the slot. A detection port is provided on the blade sleeve, communicating with the slot. The filling and venting device is connected to the blade sleeve to fill the slot with air, and the pressure detector is connected to the detection port to detect the air pressure inside the slot.

[0007] It also includes a paint pump, which is connected to the detection port to pump sealing paint fluid into the slot.

[0008] The charging and venting device includes a pump body, a pump pipe is fixedly installed at the vent port of the pump body, a control valve is installed on the pump pipe, the pump pipe is fixedly connected to the blade sleeve block, and the pump pipe is connected to the slot.

[0009] A support rod is rotatably mounted on the top of the pump body, and a telescopic rod is movably mounted on the support rod. A pressure detector is rotatably connected to the lower end of the telescopic rod.

[0010] The support rod includes a crossbar and a sliding rod. One end of the crossbar is rotatably connected to and supports the pump body, and the other end of the crossbar is fixedly connected to one end of the sliding rod. A limit block is installed on the other end of the sliding rod, and a collar is slidably installed on the sliding rod. The upper end of the telescopic rod is connected to the collar. A turntable is rotatably installed on the lower end of the telescopic rod, and an installation block is fixedly set at the bottom of the turntable. A pressure detector is installed on the installation block.

[0011] The air pressure detector includes a detector body, a detection tube is provided at the detection port of the detector body, an external threaded sleeve is fixed at the lower end of the detection tube, an internal thread is provided on the inner side of the detection port, and the external threaded sleeve is used to screw and seal with the thread of the detection port.

[0012] The blade sleeve is an integral structure with a threaded hole. A limit screw is screwed into the threaded hole for sealing. When the limit screw abuts against the turbine blade, it limits the blade sleeve to the turbine blade.

[0013] The blade sleeve is a split structure, comprising a lower sleeve and an upper sleeve. The edges of the lower sleeve and the upper sleeve are connected and sealed by multiple bolts. The lower sleeve and the upper sleeve are respectively provided with grooves on opposite sides, forming slots for the turbine blades to be installed. The lower sleeve and the upper sleeve can clamp and limit the turbine blades.

[0014] The sealing mechanism includes a sealing element installed at the end of the slot. The sealing element includes a sealing ring or a sealing gasket. The sealing element is used to abut against the turbine runner body to achieve a seal.

[0015] An operating method for the maintenance fixture for the turbine blade seals of the hydropower station includes the following steps:

[0016] Step 1: Install the blade sleeve block onto the turbine blade to be inspected and repaired through the slot, and seal the slot opening end of the blade sleeve block with the turbine runner body through the sealing mechanism; Step 2: Connect the barometer to the detection port; Step 3: Inflate the slot of the blade sleeve with air through the inflation and deflation device to create a certain air pressure environment inside the blade sleeve and simulate the actual working state of the blade. Step 4: Observe the reading of the air pressure detector to determine the airtightness of the blade. If the air pressure is stable, it means that the seal is good; if the air pressure drops beyond the threshold, it means that there is a leak in the blade. When there is a leak in the blade, the air pressure in the slot is released, the coating pump is connected to the detection port, and the sealing coating is pumped into the blade sleeve through the coating pump. The coating pump pressurizes the slot, and the sealing coating fills the minor damage at the seal under pressure.

[0017] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: 1. This invention uses an air filling and air filling device to fill the blade sleeve to create a certain air pressure environment, and then uses an air pressure detector to detect the air pressure, which can quickly determine the blade sealing performance. If the air pressure is stable, the seal is good; if the air pressure drops significantly, it indicates that there is a leak. Unlike traditional methods, it does not require time-consuming and laborious disassembly of the entire turbine for inspection, which greatly shortens the inspection time.

[0018] 2. When a significant drop in air pressure is detected, the present invention can pump a sealing coating into the blade sleeve through a coating pump to seal the blade surface. The sealing coating can fill the minor damage on the blade surface, effectively enhancing the blade sealing performance and reducing the risk of leakage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0022] Figure 3 for Figure 1 Enlarged diagram of point B in the middle.

[0023] Figure 4 for Figure 1 Enlarged diagram of point C in the middle.

[0024] Figure 5 This is a perspective view of the block and disk when they are separated in this invention.

[0025] Figure 6 for Figure 5 Enlarged diagram of point D in the middle.

[0026] Figure 7 This is a schematic diagram of the slot end without a seal in this invention.

[0027] Figure 8 for Figure 7 Enlarged diagram of point E in the middle.

[0028] Figure 9 This is a schematic diagram of the installation of a seal at the end of the slot in this invention.

[0029] Figure 10 for Figure 9 Enlarged diagram of point F in the middle.

[0030] Figure 11 This is a cross-sectional schematic diagram of the sealing gasket installed at the end of the slot in this invention.

[0031] Figure label: 1. Reinforcing block; 2. Pump pipe; 3. Pump body; 4. Blade sleeve; 5. Control button; 6. Block; 7. Disc; 8. Positioning disc; 9. Positioning screw; 10. Connecting rod; 11. Cover; 12. Detection port; 13. Crossbar; 14. Slide bar; 15. Collar; 16. Limiting block; 17. Telescopic rod; 18. Support rod; 19. Turntable; 20. Mounting block; 21. Air pressure detector; 211. Detector body; 212. Detection tube; 213. Outer 22. Threaded sleeve; 23. Round rod; 24. Circular block; 25. Circular groove; 26. Circular slot; 27. Slot; 28. U-shaped fixing frame; 29. ​​Seal; 30. Double-sided sealing adhesive; 31. Air nozzle; 32. Internal thread; 33. Sealing mechanism; 34. Threaded rod; 35. Pipe; 36. Paint cap; 37. Paint pump; 38. Paint box; 39. Inflation and exhaust device; 40. Threaded hole; 41. Limit screw; 42. Lower sleeve block; 43. Upper sleeve block Detailed Implementation To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0032] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0033] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Example 1: See Figures 1-11 This invention provides a tooling for testing the sealing of turbine blades in hydropower stations. It includes a blade sleeve 4 adapted to fit the turbine blades. The blade sleeve 4 is made of stainless steel. One side of the blade sleeve 4 has a slot 26 for inserting the turbine blade, and the end of the blade sleeve 4 has a sealing mechanism 32 for sealing the port of the slot 26. The structural design of the blade sleeve 4 allows it to fit the turbine blades, and the sealing mechanism 32 ensures the sealing of the slot 26, effectively preventing gas leakage from the gap between the blade sleeve 4 and the blade, and ensuring stable gas pressure during inflation and testing.

[0035] See Figure 1 The blade sleeve 4 is located on the end face of the slot 26 and is adapted to the curvature of the turbine runner. The top of the blade sleeve 4 is equipped with a gas filling and emptying device 38 for filling and emptying the slot 26 inside the blade sleeve 4. The gas filling and emptying device 38 includes a pump body 3. A control button 5 is installed on the side wall of the pump body 3. A pump pipe 2 is fixedly installed at the bottom of the pump body 3. A control valve is installed on the pump pipe 2. The control valve controls the opening and closing of the pump pipe 2, thereby controlling the filling, pressure holding or venting. The pump pipe 2 passes through the blade sleeve 4, and the bottom end of the pump pipe 2 is flush with the inner top of the blade sleeve 4.

[0036] See Figure 1 A crossbar 13 is installed above the inflation / deflation device 38. A slide bar 14 is fixedly installed at the end of the crossbar 13. A telescopic rod 17 is movably installed below the slide bar 14. A pressure detector 21 is rotatably installed below the telescopic rod 17. The pressure detector 21 is used to detect the pressure inside the blade sleeve block 4.

[0037] See Figure 3 The air pressure detector 21 includes a detector body 211. A detection tube 212 is fixedly installed at the bottom of the detector body 211. An external threaded sleeve 213 is fixedly installed at the lower end of the detection tube 212. Several detection ports 12 are horizontally provided through the top of the blade sleeve block 4. An internal thread 31 is provided on the inner side of the detection port 12. The external threaded sleeve 213 is threadedly installed in the detection port 12.

[0038] In use, the inflation / deflation device 38 inflates the blade sleeve 4 with air through the pump pipe 2. After reaching a certain pressure, the pump body 2 and control valve are closed to maintain the pressure, creating a certain pressure environment to simulate the pressure conditions that the blade may face during actual operation, thus preparing for subsequent testing of the blade's sealing performance. The pressure detector 21 is connected to the sealed interior of the blade sleeve 4 through the detection pipe 212 to detect changes in the pressure inside the blade sleeve 4. Its external threaded sleeve 213 is threadedly installed inside the detection port 12 to ensure the stable installation and testing of the detector body 211.

[0039] See Figure 1 , 2 A reinforcing block 1 is fixedly installed on the top of the blade sleeve 4, and the reinforcing block 1 is fixedly sleeved on the pump pipe 2. A block 6 is fixedly installed on the top of the charging and venting device 38, and a disc 7 is rotatably installed on the top of the block 6. A connecting rod 10 is installed on the top of the disc 7, and a crossbar 13 is fixedly installed on the top of the connecting rod 10. A positioning disc 8 is installed on the top of the disc 7, and a positioning screw 9 is installed on the top of the positioning disc 8. The positioning disc 8 is fixed to the disc 7 by the positioning screw 9. A support rod 18 is fixedly installed on the top of the positioning disc 8, and the top of the support rod 18 is fixedly installed at the bottom of the connecting rod 10. The reinforcing block 1 is fixed on the pump pipe 2, which enhances the structural stability of the pump pipe 2. The positioning disc 8 is fixed to the disc 7 by the positioning screw 9. The positioning disc 8 and the disc 7 are easy to install and disassemble, and convenient for maintenance and replacement.

[0040] See Figure 5 , 6 The bottom of the disc 7 is fixed with several circular rods 22 at equal angles. The lower end of the circular rods 22 is fixed with a circular block 23. The top of the block 6 is provided with an annular groove 24. Annular slots 25 are provided on both sides of the annular groove 24. The lower end of the circular rods 22 is located in the annular groove 24, and the two sides of the circular block 23 are slidably locked in the two annular slots 25. The design of the circular rods 22 and the circular block 23 enables the disc 7 to rotate stably on the block 6. The setting of the annular groove 24 and the annular slots 25 further restricts the movement of the disc 7 and ensures the stability of the rotation of the disc 7.

[0041] See Figure 1A collar 15 is movably fitted onto the slide rod 14. The bottom of the collar 15 is fixedly connected to the telescopic rod 17. A limit block 16 is fixedly installed at the end of the slide rod 14 away from the crossbar 13. The limit block 16 and the collar 15 are in a limiting engagement. A turntable 19 is rotatably installed at the telescopic end of the telescopic rod 17. A mounting block 20 is fixedly installed at the bottom of the turntable 19. A pressure detector 21 is fixedly installed at the bottom of the mounting block 20. The design of the slide rod 14 and the collar 15 allows the telescopic rod 17 to move flexibly according to the different positions of the detection ports 12. Multiple detection ports 12 are provided, and the detection port 12 that is convenient for detection can be selected according to the actual situation, which is convenient and quick. The limiting engagement between the limit block 16 and the collar 15 prevents the collar 15 from slipping off the slide rod 14.

[0042] In this embodiment, the blade sleeve 4 is an integral structure, and a threaded hole 39 is provided on the blade sleeve 4. A limit screw 40 is screwed and sealed inside the threaded hole 39. When the limit screw 40 abuts against the turbine blade, it limits the blade sleeve 4 to the turbine blade.

[0043] Example 2: The difference between this embodiment and Embodiment 1 is that, see [link to Embodiment 1] Figure 1 The blade sleeve 4 adopts a split structure. Specifically, the blade sleeve 4 includes a lower sleeve 41 and an upper sleeve 42. The edges of the lower sleeve 41 and the upper sleeve 42 are connected and sealed by multiple bolts. The lower sleeve 41 and the upper sleeve 42 are respectively provided with grooves on opposite sides, and the upper and lower grooves form slots 26 for the turbine blades to be installed. The lower sleeve 41 and the upper sleeve 42 can clamp and limit the turbine blades.

[0044] It should be noted that the shape of the blade sleeve 4 can be adapted to the size and structure of the turbine blades. The shape of the blade sleeve 4, in addition to adopting... Figure 1 The structure in the application can also be other structures, and this application does not impose specific restrictions.

[0045] Example 3: Based on Embodiment 1 or Embodiment 2, the sealing mechanism 32 includes a sealing member 28 installed at the end of the slot 26, which seals the blade sleeve block 4 with the blade.

[0046] Specifically, see Figures 7-10 The sealing element 28 adopts a sealing ring. The blade sleeve block 4 is fixed with a U-shaped fixing frame 27 at the end of the slot 26. A sealing ring is fixedly installed on the inner side of the U-shaped fixing frame 27. A double-sided sealing adhesive 29 is installed on the sealing ring. The double-sided sealing adhesive 29 is arranged in a U-shape. The other side of the double-sided sealing adhesive 29 is used to detachably stick to the outer wall of the turbine runner.

[0047] Example 4: The difference between this embodiment and embodiment 3 is that, see [link to embodiment 3]. Figure 11 The sealing element 28 uses a sealing air pad. Specifically, the blade sleeve 4 has an annular groove at the end of the slot 26, and a sealing air pad is installed in the annular groove. The air nozzle 30 of the sealing air pad extends out from one side of the blade sleeve 4. When air is injected into the sealing air pad through the air nozzle 30, the sealing air pad expands outward, thereby making tight contact with the outer wall of the turbine runner to achieve a seal.

[0048] Example 5: Based on Example 1, 2, 3, or 4, see [link to example]. Figure 1 A paint pump 36 is installed on the top of the blade sleeve block 4 to pump sealing paint fluid into it. The paint pump 36 is connected to the paint box 37 through a pipe 34. The spray pipe of the paint pump 36 is connected to the detection port 12 and communicates with the slot 26. The paint box 37 is fixedly installed on the top of the blade sleeve block 4, and a paint cover 35 is provided on the top of the paint box 37. When the turbine blade sealing is poor, the air is first released through the air release device 38. During the air release, the control valve on the pump pipe 2 is opened. After the air release is completed, the control valve on the pump pipe 2 is closed. Then the paint pump 36 is started to pump the sealing paint in the paint box 37 into the blade sleeve block 4 through the pipe 34. Under pressure, the sealing paint fills the minor damage at the sealing point and enhances the sealing performance.

[0049] Multiple detection ports 12 can be provided, and their positions can be configured as needed, for example, closer to the opening of the slot 26. The spray pipe of the paint pump 36 can be connected to different detection ports 12, and unused detection ports 12 are covered with covers 11 to close them. See details... Figure 4 A threaded rod 33 is fixedly installed at the center of the bottom of the cover 11. The threaded rod 33 is threadedly inserted into the detection port 12, and the cover 11 is screwed and fixed to the detection port 12 for sealing.

[0050] Example 2: Based on Example 5, this application also proposes a method for overhauling the seals of turbine blades in a hydropower station. The overhaul method includes the following steps: Step 1: Insert the blade sleeve 4 into the turbine blade to be inspected and repaired through the open end of the slot 26, and seal the open end of the slot 26 of the blade sleeve 4 with the turbine runner body through the sealing mechanism 32.

[0051] Step 2: Connect the barometer 21 to the detection port 12.

[0052] Step 3: Inflate the slot 26 of the blade sleeve block 4 with air through the air filling and air filling device 38 to create a certain air pressure environment inside the blade sleeve block 4, simulating the actual working state of the blade.

[0053] Step 4: Observe the reading of the air pressure detector 21 to determine the airtightness of the blade. If the air pressure is stable, it indicates that the seal is good; if the air pressure drops beyond the threshold, it indicates that there is a leak in the blade. When there is a leak in the blade, the air pressure in the slot 26 is released, the coating pump 36 is connected to the detection port 12, and the sealing coating is pumped into the blade sleeve 4 through the coating pump 36. The coating pump 36 pressurizes the slot 26, and the sealing coating fills the minor damage at the turbine blade seal under pressure, thereby enhancing the sealing performance.

[0054] Working principle and usage of this invention: In use, first insert the turbine blades into the slot 26, then detachably attach the double-sided sealing adhesive 29 to the outer wall of the turbine blades, ensuring the sealing ring fits tightly against the outer wall to prevent gas leakage from the gap between the blade sleeve 4 and the blade. Connect the air pressure detector 21 to the detection port 12. Then start the air filling and exhausting device 38, whose pump is operated via the control button 5.

[0055] When the air filling and exhaust device 38 is working, it fills the blade sleeve 4 with air, creating a certain air pressure environment inside the blade sleeve 4, and simulates the pressure situation that the blade may face in actual operation by filling it with air.

[0056] After the inflation / deflation device 38 inflates to a certain pressure and maintains that pressure, the pressure detector 21 monitors the pressure inside the blade sleeve 4 in real time. If there is a sealing problem with the blade, such as leakage, the pressure detector 21 will detect a drop in pressure. By observing the reading of the pressure detector 21, the sealing performance of the blade can be determined. If the pressure remains stable for a certain period of time, it indicates that the blade is well sealed; if the pressure drops significantly, it indicates that there is a sealing problem with the blade.

[0057] First, the air is released through the air filling and venting device 38, and then the paint pump 36 starts working. The top of the blade sleeve block 4 is fixedly equipped with a paint pump 36 for pumping sealing paint fluid into its interior. The paint pump 36 pumps the sealing paint in the paint box 37 into the interior of the blade sleeve block 4 through the pipe 34 to seal the surface of the blade. The sealing paint can fill the minor damage on the blade surface and enhance the sealing performance of the blade.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0059] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tooling for testing the seals of turbine blades in a hydropower station, characterized in that: The device includes a blade sleeve (4), an air filling and exhaust device (38), and a pressure detector (21). A slot (26) for inserting turbine blades is provided on one side of the blade sleeve (4). A sealing mechanism (32) is provided at the open end of the blade sleeve (4) in the slot (26). A detection port (12) is provided on the blade sleeve (4) and communicates with the slot (26). The air filling and exhaust device (38) is used to connect with the blade sleeve (4) to fill the slot (26) with air. The pressure detector (21) is used to connect with the detection port (12) to detect the pressure in the slot (26).

2. The tooling for testing the seals of hydropower station turbine blades according to claim 1, characterized in that: It also includes a paint pump (36) for communicating with the detection port (12) to pump sealing paint fluid into the slot (26).

3. The tooling for testing the seals of hydropower station turbine blades according to claim 1, characterized in that: The charging and discharging device (38) includes a pump body (3), a pump pipe (2) is fixedly installed at the exhaust port of the pump body (3), a control valve is installed on the pump pipe (2), the pump pipe (2) is fixedly connected to the blade sleeve block (4), and the pump pipe (2) is connected to the slot (26).

4. The tooling for testing the seals of hydropower station turbine blades according to claim 3, characterized in that: A support rod is rotatably mounted on the top of the pump body (3), and a telescopic rod (17) is movably mounted on the support rod. A pressure detector (21) is rotatably connected to the lower end of the telescopic rod (17).

5. The tooling for testing the seals of turbine blades in a hydropower station according to claim 4, characterized in that: The support rod includes a crossbar (13) and a slide bar (14). One end of the crossbar (13) is rotatably connected to and supported by the pump body (3). The other end of the crossbar (13) is fixedly connected to one end of the slide bar (14). A limit block (16) is installed on the other end of the slide bar (14). A collar (15) is slidably installed on the slide bar (14). The upper end of the telescopic rod (17) is connected to the collar (15). A turntable (19) is rotatably installed on the lower end of the telescopic rod (17). An installation block (20) is fixedly installed at the bottom of the turntable (19). A pressure detector (21) is installed on the installation block (20).

6. The tooling for testing the seals of hydropower station turbine blades according to claim 1, characterized in that: The air pressure detector (21) includes a detector body (211), a detection tube (212) is provided at the detection port of the detector body (211), an external thread sleeve (213) is fixed at the lower end of the detection tube (212), an internal thread (31) is provided on the inner side of the detection port (12), and the external thread sleeve (213) is used to screw and seal with the thread of the detection port (12).

7. The tooling for testing the seals of hydropower station turbine blades according to claim 1, characterized in that: The blade sleeve (4) is an integral structure. The blade sleeve (4) is provided with a threaded hole (39). A limit screw (40) is installed in the threaded hole (39) with a sealing screw connection. When the limit screw (40) abuts against the turbine blade, the blade sleeve (4) is limited on the turbine blade.

8. The tooling for testing the seals of hydropower station turbine blades according to claim 1, characterized in that: The blade sleeve (4) is a split structure. The blade sleeve (4) includes a lower sleeve (41) and an upper sleeve (42). The edges of the lower sleeve (41) and the upper sleeve (42) are connected and sealed by multiple bolts. The lower sleeve (41) and the upper sleeve (42) are respectively provided with grooves on opposite sides. The upper and lower grooves form slots (26) for the turbine blades to be installed. The lower sleeve (41) and the upper sleeve (42) can clamp and limit the turbine blades.

9. The tooling for testing the seals of turbine blades in a hydropower station according to claim 1, characterized in that: The sealing mechanism (32) includes a seal (28) installed at the end of the slot (26). The seal (28) includes a sealing ring or a sealing gasket. The seal (28) is used to abut against the turbine runner body to achieve a seal.

10. A maintenance method for the turbine blade seal testing fixture used in claim 2, characterized in that, Includes the following steps: Step 1: Install the blade sleeve block (4) onto the turbine blade to be inspected and repaired through the slot (26), and seal the open end of the slot (26) of the blade sleeve block (4) with the turbine runner body through the sealing mechanism (32); Step 2: Connect the barometer (21) to the detection port (12); Step 3: Inflate the slot (26) of the blade sleeve block (4) with air through the air filling and air filling device (38) to create a certain air pressure environment inside the blade sleeve block (4) to simulate the actual working state of the blade. Step 4: Observe the reading of the air pressure detector (21) to determine the sealing performance of the blade. If the air pressure is stable, it indicates that the seal is good. If the air pressure drops beyond the threshold, it indicates that there is a leak in the blades; When there is a leak in the blade, the air pressure in the slot (26) is released, the paint pump (36) is connected to the detection port (12), and the sealing paint is pumped into the blade sleeve (4) through the paint pump (36). The paint pump (36) pressurizes the slot (26), and the sealing paint fills the minor damage at the seal under pressure.

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