Stationary blade sealing ring centering tool

Abstract

The utility model discloses a stationary blade sealing ring centering tool, which belongs to the field of gas turbines and comprises a positioning and adjusting device, a positioning and adjusting device and a positioning and adjusting device. One end of the measuring rod is in sliding fit with the main board, and a group of locking pieces are arranged on the main board and are used for locking the measuring rod; the length measuring instrument is mounted at the other end of the measuring rod; an auxiliary groove coaxial with the blade ring body is formed in one end of the blade ring body; compared with a conventional machine tool centering mode and a fixed-point metering mode for centering the stationary blade sealing ring, the stationary blade sealing ring centering tool can be used for checking the centering condition anytime and anywhere, centering is convenient in the installation process of the stationary blade sealing ring, center rechecking is also easy to achieve after installation is completed, and the installation efficiency is improved. And the efficiency of assembling the stationary blade sealing ring is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the field of gas turbines, and in particular relates to a tool for centering a stationary blade sealing ring. Background Art

[0002] The gas turbine is mainly composed of three major components: compressor, combustion chamber and turbine. Air enters the compressor component from the air intake system. The high-pressure air after flowing through the compressor enters the combustion chamber for full combustion, and then passes through the turbine component to complete energy conversion. In order to reduce the leakage of high-temperature and high-pressure gas into the chamber between the turbine stator and the rotor, a sealing structure needs to be set between the turbine stator and the rotor. This structure can not only form an effective seal between the turbine stator and the intermediate gas seal, but also adapt to the expansion incoordination between the turbine blades and the intermediate gas seal caused by the temperature difference. We usually call it the stator seal ring.

[0003] In order to improve the sealing effect of the stationary blade seal ring, the surface of the stationary blade seal ring is usually hardened or coated with wear-resistant materials. In addition to materials and surface treatment, the design and centering of the stationary blade seal ring are also the key to its success. It must be able to fit the surface of the blade tightly to prevent gas leakage. In order to achieve the best sealing effect, the stationary blade seal ring usually requires a lot of testing and optimization. The location and typical structure of the stationary blade seal ring are as follows: Figure 1 As shown:

[0004] Figure 1 Among them, (3) is the blade ring body, (2) is the turbine stator blade, (21) is the heat insulation ring connecting (3) the blade ring body and (2) the turbine stator blade, (10) is a part of the gas turbine rotor, and (1) is the above-mentioned stator blade sealing ring. They divide the space into several chambers A, B, D, E and F, wherein chamber A is composed of (3) the blade ring body, (21) the heat insulation ring and (2) the turbine stator blade, chamber B is composed of (2) the turbine stator blade and (1) the stator blade sealing ring, chamber D is composed of (1) the stator blade sealing ring and (10) the rotor, and chambers E and F are both composed of (2) the turbine stator blade, (1) the stator blade sealing ring and (10) the rotor. Moreover, chamber A and chamber B are connected through (2) the turbine stator blade, chamber B and chamber D are connected through (1) the stator blade sealing ring, and chamber D and chamber E and chamber F are all connected through the gap between (1) the stator blade sealing ring and (10) the rotor. The cooling air flows from chamber A through chamber B and then into chamber D, and then flows into the mainstream area through chambers E and F, cooling the rotor and preventing the intrusion of gas in the mainstream area. When the gas turbine is actually running, the pressure stability requirements of each chamber are relatively high. If there is air leakage in individual chambers, the local cooling effect will be weakened, causing serious accidents such as overheating or even burning of components.

[0005] In order to ensure that the cooling air from chamber D flows into chambers E and F more evenly, the gap between (1) the stationary blade seal ring and (10) the rotor must be relatively uniform. If the design is not uniform, the side with a larger gap will cause an increase in gas flow, and the side with a smaller gap will cause a decrease in gas flow, which will inevitably have a greater impact on the circumferential temperature distribution of the parts, and long-term operation may easily lead to problems such as bending and deformation of the parts. Therefore, during the installation stage, it is necessary to ensure that (1) the stationary blade seal ring and (3) the blade ring body have good concentricity.

[0006] At present, the main assembly in the workshop is to verify the center of the stationary blade sealing ring after finding the center of the blade ring on the machine tool, or to place a dial indicator after finding the 4 points on the left and right of the stationary blade sealing ring, and ensure that the position of the indicator does not change during the assembly process. Since the machine tool centering will occupy the machine tool and cannot be adjusted in real time due to space limitations, the 4-point fixed position dial indicator will change with the assembly time, and even accidental touch during assembly will affect the centering effect.

[0007] Therefore, it is necessary to provide a stationary blade sealing ring centering tool to solve the above problems. Utility Model Content

[0008] The embodiment of the utility model provides a stationary blade sealing ring centering tool to solve the problems in the prior art.

[0009] The embodiment of the utility model adopts the following technical scheme: a tool for centering a stationary blade sealing ring, wherein the sealing ring is mounted on a turbine stationary blade, and the turbine stationary blade is mounted on a blade ring body through a heat insulation ring, and the centering tool is used to center the sealing ring and the blade ring body, and the centering tool comprises: a positioning and adjustment device, comprising a main board, a supporting wheel group and a positioning wheel group; a measuring rod, one end of which is slidably matched with the main board, and a group of locking members are provided on the main board for locking the measuring rod; a length measuring instrument, which is installed on the other end of the measuring rod; an auxiliary groove coaxial with the blade ring body is machined at one end of the blade ring body, the positioning wheel group is at least partially located in the auxiliary groove and moves along the contour of the auxiliary groove, the supporting wheel group is placed on one end of the blade ring body where the auxiliary groove is provided and can move along the circumferential direction of the blade ring body, and the position of the measuring rod is adjusted radially along the blade ring body so that the measuring end of the length measuring instrument rests on the inner wall of the sealing ring.

[0010] Preferably, the positioning wheel assembly includes a first bracket and two first rolling members, the first bracket is mounted on the main board, the two first rolling members are mounted on the first bracket, the two first rolling members are located at the same height and there is a gap between them; when the positioning adjustment device is installed on the blade ring body, one of the first rolling members is located in the auxiliary groove and its rolling end is against the outer wall of the auxiliary groove, and the other first rolling member is located on the side of the blade ring body away from the turbine stator blades and its rolling end is pointing directly at the outer wall of the blade ring body.

[0011] Preferably, the supporting wheel assembly includes a second bracket and a second rolling element mounted on the second bracket, and the second bracket is mounted on the main board; when the positioning adjustment device is installed on the blade ring body, the rolling end of the second rolling element abuts against the upper end surface of the blade ring body.

[0012] Preferably, the first bracket includes an auxiliary positioning plate, a limiting screw, a main positioning plate and a limiting nut, one end of the limiting screw is fixedly connected to the main positioning plate, the main positioning plate is fixedly connected to the main board, two first rolling members are respectively installed on the main positioning plate and the auxiliary positioning plate, the auxiliary positioning plate slides with the limiting screw along the axial direction of the limiting screw, and the main positioning plate and the auxiliary positioning plate are arranged in parallel; when the rolling end of the first rolling member corresponding to the main positioning plate abuts against the outer wall of the auxiliary groove, the rolling end of the first rolling member corresponding to the auxiliary positioning plate abuts against the outer wall of the leaf ring body through the threaded cooperation of the limiting nut and the limiting screw.

[0013] Preferably, the first rolling element and the second rolling element are configured as rollers or bearings.

[0014] Preferably, the measuring rod is slidably matched with a first through hole provided on the main board.

[0015] Preferably, the locking member includes at least one setscrew, the main board is provided with a threaded hole which matches the threads of the setscrew, and the setscrew is installed in the threaded hole; the position of the measuring rod is locked by the setscrew pressing against the outer wall of the measuring rod.

[0016] Preferably, the positioning wheel groups are configured with two groups and are symmetrically arranged about the central axis of the main board.

[0017] At least one of the above technical solutions adopted in the embodiment of the utility model can achieve the following beneficial effects:

[0018] Firstly, compared with the conventional machine tool centering and fixed-point dialing methods for centering the stationary blade sealing ring, the utility model uses the stationary blade sealing ring centering tool to verify the centering situation anytime and anywhere, which is not only convenient for centering during the installation of the stationary blade sealing ring, but also easy to achieve center verification after the installation is completed, thereby greatly improving the efficiency of assembling the stationary blade sealing ring.

[0019] Secondly, the utility model can quickly verify the centering situation through the centering tool, and there is no need to hoist it onto the machine tool for centering many times. Compared with the original complete stator blade sealing ring centering which requires at least 2-4 machine tool measurements, the centering tool can greatly save the cost of machine tool use and reduce the assembly cost of the stator blade sealing ring.

[0020] Thirdly, the centering tool can be used to center the sealing rings of stator blades of different sizes, thus avoiding the adverse effects of different centering methods. By using a set of centering tools to center the sealing rings of multi-stage turbine stator blades of gas turbines, the centering data can be quickly compared, the centering data can be quantified, and the assembly quality can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 It is a schematic assembly diagram of a typical structure of a gas turbine where a stationary blade sealing ring of the utility model is located;

[0023] Figure 2 It is a schematic diagram of the auxiliary groove position of the blade ring body of the utility model;

[0024] Figure 3 A schematic diagram of the use of the centering tool of the utility model;

[0025] Figure 4 A cross-sectional view of the centering tool of the utility model;

[0026] Figure 5 It is a top view of the positioning and adjusting device of the utility model;

[0027] Figure 6 for Figure 5 Sectional view of section AA;

[0028] Figure 7 It is a partial exploded view of the positioning wheel set of the utility model;

[0029] Reference numerals

[0030] 1-sealing ring; 2-turbine stator blade; 21-insulation ring; 3-blade ring body; 31-auxiliary groove; 4-positioning adjustment device; 41-main board; 411-first through hole; 412-threaded hole; 5-support wheel group; 51-second bracket; 511-direct pin; 512-fixing plate; 52-second rolling element; 6-positioning wheel group; 61-first bracket; 611-auxiliary positioning plate; 6111-second through hole; 6112-block; 612-limiting screw; 6121-slot; 613-main positioning plate; 614-limiting nut; 615-shaft rod; 62-first rolling element; 7-measuring rod; 8-locking piece; 81-fastening screw; 9-length measuring instrument; 10-rotor. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] Reference Figures 1 to 3 As shown, an embodiment of the utility model provides a stationary blade sealing ring centering tool, which is used in the assembly process of a gas turbine. The gas turbine is mainly composed of three major components: a compressor, a combustion chamber and a turbine. Air enters the compressor component from the air intake system. The high-pressure air after passing through the compressor enters the combustion chamber for full combustion, and then passes through the turbine component to complete energy conversion.

[0034] In order to reduce the leakage of high-temperature and high-pressure combustion gas into the chamber between the turbine stator blade and the rotor, a sealing structure is required to be provided between the turbine stator blade and the rotor. The sealing structure can not only form an effective seal between the turbine stator blade 2 and the intermediate gas seal body, but also adapt to the expansion incoordination between the turbine stator blade 2 and the intermediate gas seal body caused by the temperature difference. We usually call it a stator blade sealing ring 1; when assembling the sealing ring 1, firstly assemble the turbine stator blade 2 on the blade ring body 3 through the heat insulation ring 21, and then assemble the sealing ring 1 on the turbine stator blade 2, and then align the sealing ring 1 and the blade ring body 3 by the centering tool, and finally assemble the above-mentioned overall structure on the rotor 10 of the gas turbine to ensure that the radial clearance between the sealing ring 1 and the gas turbine rotor is uniform throughout the circumference;

[0035] The centering tool comprises: a positioning and adjusting device 4, including a main board 41, a supporting wheel set 5 and a positioning wheel set 6; a measuring rod 7, one end of which is slidably matched with the main board 41, and a set of locking members 8 are provided on the main board 41 for locking the measuring rod 7; a length measuring instrument 9, which is installed at the other end of the measuring rod 7;

[0036] An auxiliary groove 31 coaxial with the blade ring body 3 is processed at one end of the blade ring body 3, and the positioning wheel group 6 is at least partially located in the auxiliary groove 31 and moves along the contour of the auxiliary groove 31. The supporting wheel group 5 is placed on the end of the blade ring body 3 provided with the auxiliary groove 31 and can move along the circumferential direction of the blade ring body 3. The position of the measuring rod 7 is adjusted radially along the blade ring body 3 so that the measuring end of the length measuring instrument 9 points to the inner wall of the sealing ring 1; it should be noted that the length measuring instrument can adopt measuring instruments such as a dial indicator, a micrometer or a laser length rangefinder. At present, the most commonly used in factories is a mechanical dial indicator (the one shown in the figure is a dial indicator). After the positioning and adjustment device is installed in place, the position of the measuring rod is adjusted radially along the blade ring body so that the measuring end of the dial indicator is against the inner wall of the sealing ring. For the laser rangefinder, its measuring end is facing the inner wall of the sealing ring and zeroed to perform subsequent measurements.

[0037] In actual use, the axis of the stationary blade sealing ring 1 is placed vertically, and the blade ring body 3 is arranged with the auxiliary groove 31 on one side facing upward. The positioning wheel group 6 of the centering tool is installed at the auxiliary groove 31, and the supporting wheel group 5 is supported on the upper end surface of the blade ring body 3 by gravity, playing the role of supporting the centering tool as a whole. The relative positions of the measuring rod 7 and the length measuring instrument 9 are adjusted or locked by the locking piece 8, so that the measuring end of the length measuring instrument 9 is against the inner wall of the sealing ring 1, and then the initial value of the length measuring instrument 9 is confirmed. The staff then pushes the centering tool as a whole to make the length measuring instrument 9 rotate around the circumferential direction of the blade ring body 3. The centering condition of the stationary blade sealing ring 1 can be fully reproduced by observing or collecting the vertical changes of the length measuring instrument 9 during the entire movement process.

[0038] Compared with the conventional machine tool centering and fixed-point metering methods for the stationary blade sealing ring 1 centering, the stationary blade sealing ring 1 centering tool can verify the centering situation anytime and anywhere. It is not only convenient to center the stationary blade sealing ring 1 during installation, but also easy to verify the center after installation, which greatly improves the efficiency of assembling the stationary blade sealing ring 1. In addition, the original stationary blade sealing ring 1 centering required at least 2-4 machine tool measurements. Now, the centering tool can quickly verify the centering situation without having to hoist it to the machine tool for centering many times, which greatly saves the cost of machine tool use and reduces the assembly cost of the stationary blade sealing ring 1.

[0039] Specifically, the positioning wheel set 6 includes a first bracket 61 and two first rolling members 62, the first bracket 61 is mounted on the main board 41, the two first rolling members 62 are both mounted on the first bracket 61, and the two first rolling members 62 are located at the same height with a gap between them;

[0040] When the positioning and adjusting device 4 is installed on the blade ring body 3, one of the first rolling members 62 is located in the auxiliary groove 31 and its rolling end abuts against the outer wall of the auxiliary groove 31, and the other first rolling member 62 is located on the side of the blade ring body 3 away from the turbine stator blade 2 and its rolling end abuts against the outer wall of the blade ring body 3. The portion between the auxiliary groove 31 and the outer wall of the blade ring body 3 is just embedded in the gap between the two first rolling members 62, so that the two first rolling members 62 can move along the contour direction of the auxiliary groove 31, thereby driving the length measuring instrument 9 to move in a circular motion. The two first rolling members 62 respectively abut against the outer wall of the auxiliary groove 31 and the outer wall of the blade ring body 3, thereby ensuring the moving accuracy of the centering tool when making a circular motion around the blade ring body 3, and further ensuring the accuracy of the centering operation of the length measuring instrument 9 on the sealing ring 1.

[0041] Specifically, the supporting wheel group 5 includes a second bracket 51 and a second rolling member 52 installed on the second bracket 51, and the second bracket 51 is installed on the main board 41; when the positioning adjustment device 4 is installed on the blade ring body 3, the rolling end of the second rolling member 52 is against the upper end surface of the blade ring body 3, and the second rolling member 52 is used to support the centering tool as a whole. Because it relies on gravity to rest on the upper end of the blade ring body 3, during actual operation, when the staff pushes the centering tool to move, they need to slightly press the main board 41 so that the second rolling member 52 always rests on the blade ring body 3.

[0042] The first rolling member 62 and the second rolling member 52 are configured as rollers or bearings. In practical applications, bearings are often used as rolling members. Specifically, a shaft 615 assembled with the bearing is provided on the first bracket 61, and the inner ring of the bearing is fixed to the corresponding shaft 615 by interference fit. The second bracket 51 includes a straight pin 511 and two fixed plates 512. The inner ring of the bearing is integrated with the straight pin 511 by interference fit, and then the two ends of the straight pin 511 are welded to the two fixed plates 512.

[0043] In some practical applications:

[0044] The first bracket 61 is composed of an auxiliary positioning plate 611, a limiting screw 612, a main positioning plate 613 and a limiting nut 614. One end of the limiting screw 612 is fixedly connected to the main positioning plate 613 (can be welded), and the main positioning plate 613 is fixedly connected to the main board 41 (can be welded). The two first rolling members 62 are respectively installed on the main positioning plate 613 and the auxiliary positioning plate 611. In summary, the first rolling member 62 can be a bearing, and two shafts 615 are configured, which are respectively located on the main positioning plate 613 and the auxiliary positioning plate 611, and the inner ring of the bearing is fixed to the corresponding shaft 615 by interference fit.

[0045] The auxiliary positioning plate 611 is slidably matched with the limiting screw 612 along the axial direction of the limiting screw 612, and the main positioning plate 613 is arranged in parallel with the auxiliary positioning plate 611; specifically, a card slot 6121 extending along the axial direction of the limiting screw 612 can be opened on the limiting screw 612, and a second through hole 6111 can be opened on the auxiliary positioning plate 611, and a card block 6112 slidably matched with the card slot 6121 is provided on the inner wall of the second through hole 6111;

[0046] When the rolling end of the first rolling member 62 corresponding to the main positioning plate 613 abuts against the outer wall of the auxiliary groove 31, the rolling end of the first rolling member 62 corresponding to the auxiliary positioning plate 611 abuts against the outer wall of the blade ring body 3 through the threaded cooperation of the limiting nut 614 and the limiting screw 612. In this embodiment, when the sealing ring 1 of the gas turbine of different models or sizes is centered, the position of the auxiliary groove 31 is not fixed, so that the distance between the auxiliary positioning plate 611 and the main positioning plate 613 is adjusted and locked with the limiting nut 614, so that the positioning wheel assembly 6 It can be adapted to blade ring bodies 3 of different models or sizes. In addition, by adjusting the position of the measuring rod 7 and the length measuring instrument 9, the measuring end of the length measuring instrument 9 can also be placed against the inner wall of the sealing ring 1 of various sizes for centering thereof. In summary, the centering tool can be used to center the stator sealing rings 1 of different sizes, thereby avoiding the adverse effects of different centering methods. By using a set of centering tools to center the stator sealing rings 1 of the multi-stage turbine of the gas turbine, the data comparison of the centering situation can be quickly realized, the centering data can be quantified, and the assembly quality can be ensured to be controllable.

[0047] Specifically, the measuring rod 7 is slidably matched with the first through hole 411 provided on the main board 41; the locking member 8 includes at least one set screw 81, and the main board 41 is provided with a threaded hole 412 threadedly matched with the set screw 81, and the set screw 81 is installed in the threaded hole 412; the position of the measuring rod 7 is locked by the set screw 81 pressing against the outer wall of the measuring rod 7 to adapt to the centering of the stationary blade sealing rings 1 of different sizes.

[0048] Specifically, the positioning wheel groups 6 are configured with two groups and are symmetrically arranged with respect to the central axis of the main board 41. The two groups of positioning wheel groups 6 can position the blade ring body 3 more accurately and can also ensure that the overall stability of the centering tool is improved when the centering tool is moved.

[0049] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A tool for centering a stationary blade sealing ring, the tool being used for centering a sealing ring (1) and a blade ring body (3), the sealing ring (1) being mounted on a turbine stationary blade (2), the turbine stationary blade (2) being mounted on the blade ring body (3) via a heat insulation ring (21), characterized in that: The centering tools include: A positioning adjustment device (4), comprising a main board (41), a supporting wheel set (5) and a positioning wheel set (6); A measuring rod (7), one end of which is slidably engaged with the main board (41), and a set of locking members (8) is provided on the main board (41) for locking the measuring rod (7); A length measuring instrument (9) mounted on the other end of the measuring rod (7); One end of the blade ring body (3) is processed with an auxiliary groove (31) coaxial with the blade ring body, the positioning wheel assembly (6) is at least partially located in the auxiliary groove (31) and moves along the contour of the auxiliary groove (31), the supporting wheel assembly (5) is placed on the end of the blade ring body (3) provided with the auxiliary groove (31) and can move along the circumferential direction of the blade ring body (3), and the position of the measuring rod (7) is adjusted along the radial direction of the blade ring body (3) so that the measuring end of the length measuring instrument (9) is pointed at the inner wall of the sealing ring (1).

2. A stationary blade sealing ring centering tool according to claim 1, characterized in that: The positioning wheel assembly (6) comprises a first bracket (61) and two first rolling members (62), wherein the first bracket (61) is mounted on the main board (41), and the two first rolling members (62) are both mounted on the first bracket (61), and the two first rolling members (62) are located at the same height with a gap between them; When the positioning adjustment device (4) is installed on the blade ring body (3), one of the first rolling elements (62) is located in the auxiliary groove (31) and its rolling end abuts against the outer wall of the auxiliary groove (31), and the other first rolling element (62) is located on a side of the blade ring body (3) away from the turbine stator blades (2) and its rolling end abuts against the outer wall of the blade ring body (3).

3. A stationary blade sealing ring centering tool according to claim 2, characterized in that: The supporting wheel assembly (5) comprises a second bracket (51) and a second rolling member (52) mounted on the second bracket (51); the second bracket (51) is mounted on the main board (41); when the positioning adjustment device (4) is mounted on the leaf ring body (3), the rolling end of the second rolling member (52) abuts against the upper end surface of the leaf ring body (3).

4. A stationary blade sealing ring centering tool according to claim 2 or 3, characterized in that: The first bracket (61) comprises an auxiliary positioning plate (611), a limiting screw (612), a main positioning plate (613) and a limiting nut (614); one end of the limiting screw (612) is fixedly connected to the main positioning plate (613); the main positioning plate (613) is fixedly connected to the main board (41); two first rolling members (62) are respectively mounted on the main positioning plate (613) and the auxiliary positioning plate (611); the auxiliary positioning plate (611) is slidably matched with the limiting screw (612) along the axial direction of the limiting screw (612); and the main positioning plate (613) and the auxiliary positioning plate (611) are arranged in parallel; When the rolling end of the first rolling member (62) corresponding to the main positioning plate (613) abuts against the outer wall of the auxiliary groove (31), the threaded cooperation between the limiting nut (614) and the limiting screw (612) enables the rolling end of the first rolling member (62) corresponding to the auxiliary positioning plate (611) to abut against the outer wall of the leaf ring body (3).

5. A stationary blade seal ring centering tool according to claim 3, characterized in that: The first rolling element (62) and the second rolling element (52) are configured as rollers or bearings.

6. A stationary blade seal ring centering tool according to claim 1, characterized in that: The measuring rod (7) is slidably engaged with a first through hole (411) provided on the main board (41).

7. A stationary blade seal ring centering tool according to claim 6, characterized in that: The locking member (8) comprises at least one set screw (81); the main board (41) is provided with a threaded hole (412) threadably matched with the set screw (81); the set screw (81) is installed in the threaded hole (412); the position of the measuring rod (7) is locked by the set screw (81) being pressed against the outer peripheral wall of the measuring rod (7).

8. A stationary blade seal ring centering tool according to claim 4, characterized in that: The positioning wheel sets (6) are configured in two sets and are symmetrically arranged about the central axis of the main board (41).

9. A stationary blade seal ring centering tool according to claim 1, characterized in that: The length measuring instrument adopts a dial indicator. After the positioning and adjusting device is installed in place, the position of the measuring rod is adjusted along the radial direction of the blade ring body so that the measuring end of the dial indicator is against the inner wall of the sealing ring.

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