Sealing detection device for exhaust flange of steam guide pipe of steam turbine

Abstract

The utility model relates to the field of steam guide pipes of steam turbines, and discloses a steam guide pipe exhaust flange sealing detection device of a steam turbine, which comprises gas guide pipes, flanges and an infrared thermal imager, one end of each gas guide pipe is fixedly connected with one flange, the flanges of the two gas guide pipes are connected through bolts and nuts, and one side of each flange is provided with the infrared thermal imager. Two groups of magnetic suction adjusting structures which are symmetrical about the flange are arranged on the cylindrical surface of the gas-guide tube and on the two sides of the flange, telescopic structures are arranged on the sides, away from the gas-guide tube, of the magnetic suction adjusting structures, a translation structure is arranged between the two groups of telescopic structures, and the infrared thermal imager is mounted on the translation structure; the installation mode of the magnetic suction adjusting structure can be flexibly adjusted according to the pipe diameter of the gas guide pipe, and the infrared thermal imager can scan all parts of the flange in all directions without dead corners through the synergistic effect of the telescopic structure and the translation structure.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine guide pipes, specifically a steam turbine guide pipe exhaust flange sealing detection device. Background Technology

[0002] The steam turbine's steam pipes transmit high-temperature, high-pressure steam. If there is a problem with the sealing of the exhaust flange, steam leakage will pose a great safety hazard to the surrounding environment. Once the high-temperature steam leaks, it may burn on-site operators and cause serious personal injury accidents. Moreover, if the steam leaks into electrical equipment and other areas, it may cause short circuits, fires, or even explosions, seriously threatening the safe operation of the entire power plant.

[0003] Traditional steam turbine duct exhaust flange sealing testing devices face multiple challenges in practical applications, including poor adaptability, inability to be easily adjusted to meet different pipe diameter requirements, fixed probe positions that make it difficult to comprehensively scan complex structures and easily miss potential sealing defects, and insufficient connection stability that cannot remain stable during operation, affecting the accuracy of test data. To address these issues, we propose a steam turbine duct exhaust flange sealing testing device. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a steam turbine exhaust flange sealing detection device, which solves the aforementioned problems.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a steam turbine exhaust flange sealing detection device, comprising an exhaust pipe, a flange, and an infrared thermal imager. One end of the exhaust pipe is fixedly connected to a flange, and the flanges of the two exhaust pipes are connected by bolts and nuts. An infrared thermal imager is installed on one side of the flange. On the cylindrical surface of the exhaust pipe, two sets of symmetrical magnetic adjustment structures about the flange are provided on both sides of the flange. The magnetic adjustment structures are provided with telescopic structures on the side away from the exhaust pipe. A translation structure is provided between the two sets of telescopic structures, and the infrared thermal imager is installed on the translation structure.

[0008] Preferably, the magnetic adjustment structure includes a fixed block, an insert block, a hinge hole, and a magnetic block. The fixed block has insert blocks fixedly connected to both ends of its symmetrical structure, and each insert block has a through hinge hole. The fixed block has a magnetic block fixedly connected to one side of its fixed block.

[0009] Preferably, the magnetic adjustment structure further includes a second fixed block, a slot, and a hinge rod. The second fixed block has slots at both symmetrical ends, and a hinge rod is fixedly connected to each slot. A magnetic block is fixedly connected to one side of the second fixed block. The insert at one end of the first fixed block is engaged with the slot at one end of the second fixed block, and the hinge hole is hinged to the hinge rod. The insert at the other end of the first fixed block is engaged with the slot of another second fixed block, and the hinge hole is hinged to the hinge rod. The slot at the other end of the second fixed block is engaged with the insert at another first fixed block, and the hinge hole is hinged to the hinge rod. The magnetic adjustment structure is composed of multiple first and second fixed blocks connected at intervals by hinges. The magnetic blocks of the first and second fixed blocks are magnetically connected to the cylindrical surface of the air guide tube.

[0010] Preferably, the telescopic structure includes a telescopic rod, a square tube, and limiting holes. Multiple equally spaced limiting holes are opened through one side of the square tube. One open end of the square tube is fixedly connected to the side of the fixing block facing away from the magnetic block. The square tube is on a fixing block in the middle of the magnetic adjustment structure. The end of the square tube facing away from the fixing block is inserted and connected to the telescopic rod.

[0011] Preferably, the telescopic structure further includes a limiting protrusion, a circular groove, and a spring. The side of the telescopic rod that fits with the limiting hole has a circular groove. The circular groove is close to one end of the telescopic rod inside the square tube. A spring is fixedly connected to the opposite side of the opening of the circular groove. The other end of the spring is fixedly connected to the limiting protrusion. The limiting protrusion passes through the limiting hole outside the square tube and is engaged with the limiting hole.

[0012] Preferably, the translation structure includes a threaded rod, an adjusting block, and a threaded hole. A threaded rod is fixedly connected between the opposite sides of the two telescopic rods. An adjusting block is fixedly connected to the back of the infrared thermal imager. A threaded hole is opened through the side of the adjusting block that is parallel to the side of the infrared thermal imager. The threaded hole is inserted into and connected to the threaded rod, and the threaded hole is threadedly connected to the threaded rod.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a steam turbine exhaust flange sealing detection device, which has the following advantages:

[0015] 1. The turbine exhaust flange sealing test device has a magnetic adjustment structure that allows for flexible installation based on the diameter of the exhaust pipe. Regardless of the exhaust pipe size, it can achieve quick and stable installation, greatly expanding the applicability of the test device. It eliminates the need for frequent replacement of test equipment due to different exhaust pipe diameters, reducing test costs and improving the convenience and versatility of the test work.

[0016] 2. This turbine exhaust flange sealing detection device, through the coordinated action of the telescopic and translational structures, enables the infrared thermal imager to perform a comprehensive, blind-spot-free scan of all parts of the flange. Furthermore, the infrared thermal imager's ability to visually present images based on temperature differences, combined with scientific temperature judgment standards, allows for precise location of leaks. This effectively avoids missing potential sealing defects due to incomplete detection, providing a strong guarantee for the reliable evaluation of the turbine exhaust flange sealing performance, thereby ensuring the safe and stable operation of the turbine. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is an exploded view of the structure of this utility model.

[0019] Figure 3 This is a cross-sectional schematic diagram of the telescopic structure of this utility model.

[0020] Figure 4 for Figure 3 A magnified view of part A in the diagram.

[0021] Figure 5 This is a cross-sectional schematic diagram of the magnetic adjustment structure of this utility model.

[0022] Figure 6 for Figure 5 A magnified view of part B in the diagram.

[0023] In the diagram: 1. Air duct; 2. Flange; 3. Fixing block one; 4. Fixing block two; 5. Infrared thermal imager; 6. Adjusting block; 7. Threaded rod; 8. Telescopic rod; 9. Square tube; 10. Limiting hole; 11. Insert block; 12. Hinge hole; 13. Slot; 14. Hinge rod; 15. Magnetic block; 16. Limiting protrusion; 17. Threaded hole; 18. Circular groove; 19. Spring. Detailed Implementation

[0024] 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.

[0025] Please see Figure 1-6A steam turbine exhaust flange sealing detection device includes an exhaust pipe 1, a flange 2, and an infrared thermal imager 5. One end of the exhaust pipe 1 is fixedly connected to the flange 2. The flanges 2 of the two exhaust pipes 1 are connected by bolts and nuts. The infrared thermal imager 5 is installed on one side of the flange 2. On the cylindrical surface of the exhaust pipe 1, two sets of magnetic attraction adjustment structures symmetrical about the flange 2 are provided on both sides of the flange 2. The magnetic attraction adjustment structures are provided with telescopic structures on the side away from the exhaust pipe 1. A translation structure is provided between the two sets of telescopic structures. The infrared thermal imager 5 is installed on the translation structure.

[0026] Furthermore, the magnetic adjustment structure includes a fixed block 3, an insert block 11, a hinge hole 12, and a magnetic block 15. The fixed block 3 is fixedly connected to both ends of the fixed block 11. The insert block 11 is provided with a hinge hole 12. The fixed block 3 is fixedly connected to one side of the fixed block 3. The fixed block 3 is used to install the telescopic structure, and the magnetic block 15 is used to magnetically connect the fixed block 3 to the air duct 1.

[0027] Furthermore, the magnetic adjustment structure also includes a second fixing block 4, a slot 13, and a hinge rod 14. Slots 13 are provided at both ends of the second fixing block 4, and hinge rods 14 are fixedly connected to each slot 13. A magnetic block 15 is fixedly connected to one side of the second fixing block 4. A plug 11 at one end of the first fixing block 3 is engaged with the slot 13 at one end of the second fixing block 4, and the hinge hole 12 is hinged to the hinge rod 14. A plug 11 at the other end of the first fixing block 3 is engaged with the slot 13 of the second fixing block 4, and the hinge hole 12 is hinged to the hinge rod 14. Similarly, a slot 13 at the other end of the second fixing block 4 is engaged with the plug 11 of the first fixing block 3, and the hinge hole 12 is hinged to the hinge rod 14. The rod 14 is hinged, and the magnetic adjustment structure consists of multiple fixed blocks 3 and 4 that are hinged at intervals. The magnetic block 15 of fixed block 3 and the magnetic block 15 of fixed block 4 are magnetically connected to the cylindrical surface of the air guide tube 1. The magnetic block 15 is used to magnetically connect the fixed block 4 to the air guide tube 1. The slot 13 is used to insert the plug 11. The hinge hole 12 and the hinge rod 14 are used to hinge the fixed blocks 3 and 4. The fixed blocks 3 and 4 can rotate. The angle between the fixed blocks 3 and 4 can be rotated according to the specific outer diameter of the air guide tube 1. The number of fixed blocks 3 and 4 can be increased or decreased according to the specific outer diameter of the air guide tube 1.

[0028] Furthermore, the telescopic structure includes a telescopic rod 8, a square tube 9, and limiting holes 10. Multiple equally spaced limiting holes 10 are provided through one side of the square tube 9. One open end of the square tube 9 is fixedly connected to the side of the fixing block 3 facing away from the magnetic block 15. The square tube 9 is on a fixing block 3 in the middle of the magnetic adjustment structure. The telescopic rod 8 is inserted and connected to the end of the square tube 9 facing away from the fixing block 3. The square tube 9 and the telescopic rod 8 can slide between each other. The telescopic rod 8 is used to install the translation structure.

[0029] Furthermore, the telescopic structure also includes a limiting protrusion 16, a circular groove 18, and a spring 19. A circular groove 18 is provided on the side of the telescopic rod 8 that is in contact with the limiting hole 10. The circular groove 18 is located near one end of the telescopic rod 8 inside the square tube 9. A spring 19 is fixedly connected to the opposite side of the opening of the circular groove 18. The other end of the spring 19 is fixedly connected to the limiting protrusion 16. The limiting protrusion 16 passes through the limiting hole 10 and is outside the square tube 9. The limiting protrusion 16 is snapped into the limiting hole 10. The limiting hole 10 and the limiting protrusion 16 are used to limit the fixed distance between the telescopic rod 8 and the square tube 9. The circular groove 18 is used to install the spring 19 and the limiting protrusion 16. When the spring 19 is compressed, the spring 19 and the limiting protrusion 16 are completely inside the circular groove 18. The telescopic rod 8 and the square tube 9 can extend and retract to adjust the distance, thereby adjusting the distance between the translation structure and the air guide tube 1.

[0030] Furthermore, the translation structure includes a threaded rod 7, an adjusting block 6, and a threaded hole 17. A threaded rod 7 is fixedly connected between the opposite sides of the two telescopic rods 8. An adjusting block 6 is fixedly connected to the back of the infrared thermal imager 5. A threaded hole 17 is opened through the side of the adjusting block 6 parallel to the side of the infrared thermal imager 5. The threaded hole 17 is inserted into and threadedly connected to the threaded rod 7. The threaded rod 7 is a slide rail for the translation and sliding of the infrared thermal imager 5. The adjusting block 6 is used to install the infrared thermal imager 5. The threaded hole 17 is threadedly connected to the threaded rod 7. The horizontal position of the infrared thermal imager 5 can be adjusted by rotating the adjusting block 6 and the infrared thermal imager 5.

[0031] Structural Description:

[0032] Steam pipe 1: It is a cylindrical pipe that transmits steam. One end of it is fixedly connected to flange 2 and is the main part of the entire object being tested.

[0033] Flange 2: It is disc-shaped with a through hole in the center for connecting the air guide pipe 1 and bolt holes distributed around the edge to connect the two air guide pipes 1, ensuring the connection of the pipeline system. Its sealing performance is the key point of testing.

[0034] Fixed block 3: It is block-shaped with symmetrical fixed inserts 11 at both ends and a magnetic block 15 connected to one side. It is used to install the telescopic structure and is a component of the magnetic adjustment structure. It works with other components to realize the installation and adjustment of the device on the air pipe 1.

[0035] Fixed block 2 4: It is block-shaped with slots 13 symmetrically opened at both ends. One side is connected to magnetic block 15. It is hinged with fixed block 1 3 at intervals to form a magnetic adjustment structure. The angle and number can be adjusted according to the outer diameter of the air duct 1 to help achieve stable installation of the device and pipe diameter adaptation.

[0036] Infrared thermal imager 5: Installed on the translation structure via adjustment block 6, it converts infrared rays from the object surface into a temperature image and detects whether there is steam leakage at the flange 2 seal. It is the core detection element of the detection device.

[0037] Adjustment block 6: It is a block structure. One side is fixed to the back of the infrared thermal imager 5, and the other side has a threaded hole 17 to cooperate with the threaded rod 7. The infrared thermal imager 5 is installed and its horizontal position is adjusted by rotation.

[0038] Threaded rod 7: It is a slender cylindrical rod with both ends fixed to the opposite surfaces of two telescopic rods 8. It serves as a slide rail for the infrared thermal imager 5 to slide horizontally, and works with the adjusting block 6 to achieve its horizontal movement.

[0039] Telescopic rod 8: It is a rod-shaped structure, one end of which can slide inside the square tube 9. It is used to install the threaded rod 7 in the translation structure and forms a telescopic structure with the square tube 9 to adjust the axial distance between the detection device and the air guide tube 1.

[0040] Square tube 9: It is a square tube with multiple equidistant limiting holes 10 on one side and one end fixed to the fixing block 3. It works with the telescopic rod 8 to adjust the axial distance of the detection device.

[0041] Limiting hole 10: It is a circular through hole on the side of the square tube 9, which cooperates with the limiting protrusion 16 to limit the fixed distance between the telescopic rod 8 and the square tube 9, ensuring the stability of the telescopic structure after adjustment;

[0042] Insert 11: It is a cuboid block, fixed at both ends of the first fixed block 3, and can be inserted into the slot 13 of the second fixed block 4. It cooperates with the hinge rod 14 through the hinge hole 12 to realize the hinge connection between the first fixed block 3 and the second fixed block 4, and participates in the construction of the magnetic adjustment structure and the pipe diameter adaptation adjustment.

[0043] Hinge hole 12: It is a circular through hole on the insert block 11, which cooperates with the hinge rod 14 in the slot 13 of the second fixing block 4, so that the first fixing block 3 and the second fixing block 4 can rotate relative to each other to meet the installation requirements of different pipe diameters;

[0044] Slot 13: A rectangular groove opened at both ends of the fixing block 2 4, used to insert the plug 11, and together with the hinge rod 14 to realize the connection with the fixing block 1 3 and the angle adjustment;

[0045] Hinged rod 14: It is cylindrical rod and is fixed in slot 13 of fixed block 2 4. It cooperates with hinge hole 12 of insert block 11 to realize the hinge of fixed block 1 3 and fixed block 2 4, so that the magnetic adjustment structure can be flexibly adjusted.

[0046] Magnetic block 15: It is block-shaped and fixed on one side of fixed block 3 and fixed block 4. It uses magnetism to attract these fixed blocks to the cylindrical surface of the air guide tube 1, so as to realize the stable installation of the detection device on the air guide tube 1.

[0047] Limiting protrusion 16: It is block-shaped, with one end connected to spring 19, and can pass through limiting hole 10. It engages with limiting hole 10 to limit the relative position of telescopic rod 8 and square tube 9, ensuring the stability of telescopic structure.

[0048] Threaded hole 17: This is an internal threaded hole on the adjusting block 6, which is threadedly connected to the threaded rod 7. Rotating the adjusting block 6 causes the infrared thermal imager 5 to move horizontally on the threaded rod 7.

[0049] Circular groove 18: A circular groove on the telescopic rod 8, located near one end of the telescopic rod 8 inside the square tube 9, used to install the spring 19 and the limiting protrusion 16, providing space for the adjustment of the telescopic structure;

[0050] Spring 19: It is spiral-shaped, with one end fixed to the side opposite the opening of the circular groove 18, and the other end connected to the limiting protrusion 16. When pressed, the limiting protrusion 16 retracts into the circular groove 18, realizing the extension and retraction adjustment of the telescopic rod 8 and the square tube 9. After releasing, the limiting protrusion 16 pops out and is fixed in position.

[0051] Working principle: When facing air guide pipes 1 of different diameters, the magnetic block 15 adsorbs the structure composed of fixed block 3 and fixed block 4 at intervals and hinges onto the cylindrical surface of the air guide pipe 1. Depending on the pipe diameter, on the one hand, the angle between fixed block 3 and fixed block 4 can be rotated to flexibly adapt to the connection between the insert 11 and the slot 13, and the hinge relationship between the hinge hole 12 and the hinge rod 14. On the other hand, the number of fixed blocks 3 and fixed blocks 4 can be increased or decreased as needed to complete the stable installation of the device on the air guide pipe 1, solving the problem of adaptability of traditional devices. To address the problem of poor performance, the telescopic structure allows for flexible adjustment of the axial distance between the detection device and the air duct 1. When it is necessary to change the distance between the infrared thermal imager 5 and the air duct 1, the limiting protrusion 16 is pressed, causing it to retract into the circular groove 18 against the elastic force of the spring 19. At this time, the telescopic rod 8 can slide freely within the square tube 9. After reaching the appropriate position, the limiting protrusion 16 is released. Under the action of the spring 19, the limiting protrusion 16 engages with the corresponding limiting hole 10, fixing the relative position of the telescopic rod 8 and the square tube 9. This adjusts the translation structure and the infrared thermal imager mounted on it. The distance between the instrument 5 and the air guide pipe 1 meets the requirements of detection distance in different detection scenarios. The translation structure is used to adjust the horizontal position of the infrared thermal imager 5. Since the threaded hole 17 is threadedly connected to the threaded rod 7, when the adjustment block 6 is rotated, the infrared thermal imager 5 will translate along the axial direction of the threaded rod 7. In this way, the infrared thermal imager 5 can be accurately aligned with various parts of the flange 2, solving the problem of fixed detection probe position and difficulty in comprehensive scanning in traditional devices. After the above position adjustment is completed, the infrared thermal imager 5 is turned on. During the operation of the steam turbine, if there is steam leakage at the flange 2 seal, the leaked high-temperature steam will cause the temperature of the surrounding area to rise. The infrared thermal imager 5 converts the infrared rays emitted by the object surface into temperature images and displays different temperature areas intuitively through different colors. The operator observes the thermal image and focuses on easily leaking parts such as the flange 2 connection. If the local temperature is more than 20°C higher than the surrounding background temperature, according to the previously set judgment criteria, it can be determined that there is likely a leak at this part, thereby achieving comprehensive and accurate detection of the sealing performance of the steam turbine air guide pipe exhaust flange.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steam turbine steam pipe exhaust flange sealing detection device, comprising a steam pipe (1), a flange (2) and an infrared thermal imager (5), one end of the steam pipe (1) is fixedly connected with the flange (2), the flanges (2) of the two steam pipes (1) are connected through bolts and nuts, and the flange (2) is provided with the infrared thermal imager (5) on one side, characterized in that: The cylindrical surface of the air guide pipe (1) is provided with two groups of magnetic attraction adjusting structures symmetric about the flange (2) on both sides of the flange (2), the side away from the air guide pipe (1) of the magnetic attraction adjusting structure is provided with an extension structure, the two groups of extension structures are provided with a translation structure, and the infrared thermal imager (5) is installed on the translation structure. ​ 2. A seal detection device for a steam turbine gland flange according to claim 1, characterized in that: The magnetic attraction adjusting structure comprises a fixed block one (3), an insertion block (11), a hinged hole (12) and a magnetic attraction block (15), the symmetric two ends of the fixed block one (3) are fixedly connected with the insertion block (11), the hinged hole (12) is penetratingly formed in the insertion block (11), and one side of the fixed block one (3) is fixedly connected with the magnetic attraction block (15).

3. A seal detection device for a steam turbine gland flange according to claim 2, wherein: The magnetic attraction adjusting structure further comprises a fixed block two (4), an insertion slot (13) and a hinged rod (14), the symmetric two ends of the fixed block two (4) are provided with the insertion slot (13), the hinged rod (14) is fixedly connected in the insertion slot (13), one side of the fixed block two (4) is fixedly connected with the magnetic attraction block (15), the insertion block (11) at one end of the fixed block one (3) is connected in the insertion slot (13) at one end of the fixed block two (4) in a clamping mode and the hinged hole (12) is connected with the hinged rod (14) in a hinged mode, the insertion block (11) at the other end of the fixed block one (3) is connected with the insertion slot (13) of the other fixed block two (4) in a clamping mode and the hinged hole (12) is connected with the hinged rod (14) in a hinged mode, the insertion slot (13) at the other end of the fixed block two (4) is connected with the insertion block (11) of the other fixed block one (3) in a clamping mode and the hinged hole (12) is connected with the hinged rod (14) in a hinged mode, the magnetic attraction adjusting structure is composed of multiple fixed block ones (3) and fixed block twos (4) connected in a hinged mode, the magnetic attraction block (15) of the fixed block one (3) and the magnetic attraction block (15) of the fixed block two (4) are connected with the cylindrical surface of the air guide pipe (1) in a magnetic attraction mode.

4. A seal detection device for a steam turbine gland flange according to claim 3, wherein: The extension structure comprises a telescopic rod (8), a square tube (9) and a limiting hole (10), a plurality of equidistant limiting holes (10) are penetratingly formed in one side of the square tube (9), the opening end of the square tube (9) is fixedly connected on the side of the fixed block one (3) away from the magnetic attraction block (15), the square tube (9) is arranged on one fixed block one (3) in the middle of the magnetic attraction adjusting structure, and the end of the square tube (9) away from the fixed block one (3) is connected with the telescopic rod (8) in a plug-in mode.

5. A seal detection device for a steam turbine gland flange according to claim 4, wherein: The extension structure further comprises a limiting protruding block (16), a circular groove (18) and a spring (19), the side, close to the telescopic rod (8), of the limiting hole (10) is provided with the circular groove (18), the circular groove (18) is close to the end of the telescopic rod (8) in the square tube (9), the opening side of the circular groove (18) is fixedly connected with the spring (19), the other end of the spring (19) is fixedly connected with the limiting protruding block (16), the limiting protruding block (16) penetrates the limiting hole (10) and is arranged outside the square tube (9), and the limiting protruding block (16) is connected with the limiting hole (10) in a clamping mode.

6. A steam turbine duct exhaust flange seal detection device as claimed in claim 5, characterized in that: The translation structure comprises a threaded rod (7), an adjusting block (6) and a threaded hole (17), the two telescopic rods (8) are fixedly connected with a threaded rod (7) between opposite sides, the back of the infrared thermal imager (5) is fixedly connected with the adjusting block (6), the side of the adjusting block (6) parallel to the infrared thermal imager (5) is provided with the threaded hole (17) penetratingly, the threaded hole (17) is insertedly connected with the threaded rod (7), and the threaded hole (17) is screwedly connected with the threaded rod (7).

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