Turbine rotor sealing fin height detection tool

Abstract

The utility model relates to the technical field of sealing tooth measurement, in particular to a turbine rotor sealing fin height detection tool. The tool comprises a dial indicator and a dial indicator frame, the dial indicator penetrates through the dial indicator frame in the longitudinal direction and is connected with the dial indicator frame, the dial indicator comprises a measuring head, the measuring head is arranged below the dial indicator frame, the measuring head is provided with grooves matched with the sealing teeth, and the measuring head rolls on the sealing teeth in the circumferential direction of the sealing piece and is used for measuring the height of the sealing teeth. The device further comprises a plurality of first rolling wheels, the plurality of first rolling wheels are symmetrically arranged on the two sides of the meter frame along the center line of the measuring head, and the width of each first rolling wheel is matched with the width of a sealing gap between every two adjacent sealing teeth. According to the utility model, the height of the sealing sheet can be directly and accurately measured before trial assembly of a rotor, and the accurate turning amount of each sealing tooth can be directly obtained by comprehensively calculating the size of the inner hole of the sealing sleeve, so that the accurate measurement of the height of the sealing tooth is realized.

Description

Technical Field

[0001] This utility model relates to the field of sealing tooth measurement technology, specifically a tooling for detecting the height of a turbine rotor sealing sheet. Background Technology

[0002] High and low tooth seals are simple and efficient and widely used in turbine machinery. However, due to fluid scouring, rotational wear, etc., after a period of operation, the seal will wear out, the gap will increase, and the sealing effect will gradually decrease or fail. At this time, the sealing teeth need to be replaced.

[0003] During replacement, the old sealing plate needs to be removed and a new one installed. Due to long-term operation or improper maintenance, the sealing body may experience varying degrees of deformation and wear. Even after machining according to the original design dimensions, there will still be deviations in the final clearance. If the deviation is large, a clearance that is too small will affect installation and operation, while a clearance that is too large will lead to seal failure and prevent the repair from achieving the desired effect. Therefore, the new sealing plate usually has a certain machining allowance. After trial installation on site, it is then re-ground according to the on-site fit clearance to achieve the designed sealing fit clearance requirements.

[0004] For example, after the turbine machinery's pulley seal is replaced by the equipment manufacturer, it's crucial to ensure a proper fit clearance with the sealing sleeve. To avoid exceeding clearance tolerances, the machining allowance at the factory is typically conservative. When the rotor arrives on-site, single or multiple clearances often fall short. Calculations determine the deviation and machining allowance. On-site reprocessing is usually performed using the following methods. Specific processing methods are as follows:

[0005] 1. The rotor is machined on a large horizontal lathe according to the turning amount, and then installed into the machine housing. The sealing gap is measured. Based on the deviation between the measurement data and the design requirements, the rotor is turned again, or even multiple times, to ensure that the sealing gap meets the design requirements.

[0006] 2. Using specialized tooling, the machine is turned round by round, and repeated trial fittings and gap measurements are performed to achieve the design requirements.

[0007] 3. In the absence of specialized tooling and a large bed, manual filing is used to refine the parts circle by circle, and repeated trial fittings and gap measurements are performed to achieve the design requirements.

[0008] All of the above solutions require the measurement of the clearance between the sealing plate and the sealing sleeve after the rotor is test-assembled, and the machining amount of the sealing teeth can only be calculated in the next step.

[0009] Since the sealing sheet is generally only 0.3mm to 0.4mm thick and has relatively low strength, there will be a certain error in the calculated dimensions after lathe machining compared to the actual dimensions. Whether it is qualified requires re-installing the rotor into the machine housing for measurement and verification. Furthermore, manual filing involves filing section by section, and the machining accuracy relies mainly on the worker's feel and experience, making it difficult to ensure machining accuracy. Incomplete filing can even result in numerous high points. Even with hoisting and trial assembly, it is difficult to guarantee that the height of every point on the sealing sheet is consistent. Moreover, repeated hoisting, especially when the rotor sealing gap is small, can easily damage the sealing sheet, and also increases the safety risks for personnel. Therefore, designing and manufacturing a testing fixture that can accurately measure the height of the sealing teeth is essential. Summary of the Invention

[0010] The purpose of this invention is to overcome the aforementioned problems in the prior art and to provide a turbine rotor sealing strip height detection fixture, which can directly and accurately measure the height of the sealing strip before rotor trial assembly.

[0011] This utility model provides a fixture for detecting the height of a turbine rotor sealing plate, including a dial indicator and a fixture. The dial indicator extends longitudinally through the fixture and is connected to it. The dial indicator includes a measuring head located below the fixture and has grooves that mate with each sealing tooth. The measuring head rolls circumferentially along the sealing plate among the sealing teeth to determine the height of the sealing teeth. The fixture also includes:

[0012] The first roller is configured in multiple ways, and the multiple first rollers are symmetrically arranged on both sides of the measuring head along the center line of the measuring head. The width of each first roller matches the width of the sealing gap between two adjacent sealing teeth.

[0013] Preferably, the measuring head includes a cylindrical tube and a second roller. The cylindrical tube is located below the instrument frame, and a rectangular groove is symmetrically formed at the bottom of the cylindrical tube along the vertical axis of the cylindrical tube. The second roller is arranged horizontally in the rectangular groove and is rotatably connected to the inner wall of the cylindrical tube. The groove is provided on the second roller.

[0014] Preferably, the width of the groove is 1 mm.

[0015] Preferably, the thickness of the first roller is 3mm to 5mm.

[0016] Preferably, there are four first rollers, and two first rollers on the same side are rotatably connected to the watch frame in a figure-eight shape.

[0017] Preferably, the dial indicator further includes a dial head and a measuring rod. The dial head is located above the dial frame, and the measuring rod extends vertically through the dial frame. The top of the measuring rod is connected to the dial head, and the bottom of the measuring rod is connected to the measuring head.

[0018] Preferably, a support platform is also provided on the top surface of the meter frame along the horizontal direction. A vertical through groove is opened on the top of the support platform. A first through groove communicating with the vertical through groove is opened on the top of the meter frame. The top of the measuring rod is located above the top surface of the vertical through groove. The bottom end of the measuring rod passes through the vertical through groove and the first through groove, and its protruding end is connected to the measuring head. A second through groove is also opened on the front and rear side walls of the support platform. A limiting member is provided in the second through groove to restrict the horizontal movement of the measuring rod. When the limiting member is connected to the measuring rod, the measuring rod cannot move in the horizontal direction. When the limiting member is not connected to the measuring rod, the measuring rod can move in the horizontal direction.

[0019] Preferably, the length of the vertical through groove is greater than or equal to the length of the first through groove.

[0020] Preferably, the limiting component includes a first locking block, a second locking block, and a screw. Both the first and second locking blocks can be inserted into the second through slot in a direction perpendicular to the axis of the measuring rod. The insertion ends of the first and second locking blocks are provided with semi-circular grooves that match the shape of the measuring rod. A U-shaped pull ring with a retractable length is connected to the first locking block near the semi-circular groove. One end of the U-shaped pull ring is slidably connected to the first locking block. A strap is also provided on the first locking block on the opposite side of the semi-circular groove. The strap is connected to the other end of the U-shaped pull ring through a through hole. The second locking block is provided with a pull ring groove that matches the U-shaped pull ring. The U-shaped pull ring and the pull ring groove are used together to make the semi-circular grooves of the first and second locking blocks fit together to form a circular locking groove on the measuring rod. A threaded hole is provided on the first locking block perpendicular to the vertical axis of the measuring rod. A screw is provided in the threaded hole. The screw passes through the threaded hole and abuts against the measuring rod.

[0021] Preferably, the semi-circular groove is provided with an anti-slip layer.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. The turbine rotor sealing plate height detection fixture provided by this utility model consists of multiple first rollers mounted at the sealing gap between two sealing teeth. The groove under the measuring head abuts against the sealing tooth to be measured. Then, the turbine rotor sealing plate height detection fixture is rotated, causing the measuring head to roll along the circumference of the sealing plate on each sealing tooth to determine the height of the sealing tooth. This turbine rotor sealing plate height detection fixture can measure the height of each sealing tooth at every point in 360°. In this way, while measuring the height of the sealing plate, the height error of each sealing plate in 360° is also detected simultaneously. Even if manual filing is performed, the height of the sealing plate can be accurately determined by measuring the height of the sealing plate through the measuring fixture, thus ensuring the quality of manual filing.

[0024] 2. The turbine rotor sealing plate height detection fixture provided by this utility model can directly measure the height of the sealing plate before the rotor is assembled. The precise machining amount of each sealing tooth can be directly obtained by calculating the inner hole size of the sealing sleeve.

[0025] 3. The turbine rotor sealing strip height detection fixture provided by this utility model enables the sealing strip size to be detected after the sealing teeth have been machined on site, directly determining whether the machining is in place, without the need for repeated trial assembly for indirect inspection.

[0026] 4. According to domestic calculations, the maintenance period for each large rotor set is shortened by at least 3 days (including transportation), saving over 10,000 yuan in transportation costs and 5,000 yuan in processing costs. Due to the significant reduction in the maintenance period, it is conservatively estimated that this will reduce production losses for users by hundreds of thousands to millions of yuan per day. It also improves the on-site processing convenience of turbine rotor seals, reduces restrictions on large equipment, lowers repair costs, saves repair time, and enhances customer experience. Attached Figure Description

[0027] Figure 1 This is a front view of the present invention;

[0028] Figure 2 This is a side view of the present invention;

[0029] Figure 3 This is a top view of the present invention;

[0030] Figure 4 for Figure 1 Enlarged view of measuring head A;

[0031] Figure 5 This is a schematic diagram of the overall structure of this utility model;

[0032] Figure 6 This is an exploded view of the overall structure of this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Dial indicator, 2. Indicator holder, 3. First locking block, 4. Second locking block, 5. First roller, 6. Screw, 7. Strap, 8. Cylindrical tube, 9. Second roller. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1 ~Attached Figure 6 The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the protection scope of this utility model.

[0036] This invention can solve the problems of existing rotors that still need to be installed in the housing for measurement and verification after turning, and the inability to ensure that the height of each sealing plate is consistent during manual filing through testing.

[0037] This utility model provides a tooling for detecting the height of a turbine rotor sealing plate, including: a dial indicator 1 and a frame 2. The dial indicator 1 extends longitudinally through the frame 2 and is connected to the frame 2. The dial indicator 1 includes a measuring head, which is located below the frame 2 and has grooves that mate with each sealing tooth. The measuring head rolls along the circumference of the sealing plate on each sealing tooth to determine the height of the sealing tooth. It also includes: a first roller 5, wherein multiple first rollers 5 are provided, and the multiple first rollers 5 are symmetrically arranged on both sides of the frame 2 along the center line of the measuring head. The width of each first roller 5 matches the width of the sealing gap between two adjacent sealing teeth.

[0038] In use, the rotor to be tested needs to be placed on a special support with the sealing teeth suspended in the air. The measuring fixture is then set up at the sealing teeth. By holding the measuring fixture, the dial indicator is aligned with the sealing teeth, ensuring the sealing teeth are inserted into the grooves of the measuring head. Multiple first rollers 5 are positioned within the grooves between adjacent sealing teeth on both sides of the measuring tooth. The measuring fixture is then rolled circumferentially along the sealing sheet to obtain the height of one sealing tooth. This method allows for the determination of the height of multiple sealing teeth on the sealing sheet. This enables direct and accurate measurement of the sealing sheet height before rotor trial assembly. Combined with the calculated inner diameter of the sealing sleeve, the precise machining amount of each sealing tooth can be directly obtained.

[0039] Specifically, to further improve the 360° height measurement of each sealing tooth of the sealing plate, the measuring head is improved. The measuring head includes a cylindrical cylinder 8 and a second roller 9. The cylindrical cylinder 8 is located below the gauge holder 2, and rectangular grooves are symmetrically formed on the bottom of the cylindrical cylinder 8 along its vertical axis. The second roller 9 is horizontally positioned within the rectangular grooves and rotatably connected to the inner wall of the cylindrical cylinder 8. The grooves are located on the second roller 9. By making the second roller 9 roll on the sealing teeth, the friction between the grooves and the sealing teeth can be further reduced.

[0040] Specifically, the groove width is 1mm and the sealing tooth thickness is 0.3mm to 0.4mm. When using the measuring fixture, avoid excessive left-right swaying of the measuring fixture, which may cause friction with the sealing tooth and affect the accuracy of the measurement results.

[0041] Specifically, the thickness of the first roller 5 is 3mm, which is less than the distance between two adjacent sealing teeth, so as to avoid friction between the measuring tool and the sealing teeth during measurement, which would affect the accuracy of the measurement results.

[0042] Specifically, there are four first rollers 5, and two first rollers 5 located on the same side are connected to the frame 2 in a figure-eight shape, which improves the convenience and stability of handheld rolling measurement.

[0043] Specifically, the specific structure of dial indicator 1 is given. Dial indicator 1 also includes a meter head and a measuring rod. The meter head is located above the meter frame 2. The measuring rod runs vertically through the meter frame 2. The top of the measuring rod is connected to the meter head, and the bottom of the measuring rod is connected to the measuring head.

[0044] Specifically, to facilitate the measurement of the height of each sealing tooth on the sealing plate, a support platform is provided on the top surface of the meter holder 2 along the horizontal direction. A vertical through groove is opened on the top of the support platform, and a first through groove communicating with the vertical through groove is opened on the top of the meter holder 2. The top of the measuring rod is located above the top surface of the vertical through groove, and the bottom end of the measuring rod passes through the vertical through groove and the first through groove. Its protruding end is connected to the measuring head. A second through groove is also opened on the front and rear side walls of the support platform, passing through the vertical through groove. A limiting member is provided in the second through groove to restrict the horizontal movement of the measuring rod. When the limiting member is connected to the measuring rod, the measuring rod cannot move in the horizontal direction. When the limiting member is not connected to the measuring rod, the measuring rod can move in the horizontal direction.

[0045] Specifically, the length of the vertical through groove is greater than or equal to the length of the first through groove, which allows for the measurement of the height of the sealing tooth on the outermost side of the sealing plate.

[0046] Specifically, the structure of the limiting component is given. The limiting component includes a first locking block 3, a second locking block 4, and a screw. Both the first locking block 3 and the second locking block 4 can be inserted into the second through slot in a direction perpendicular to the axis of the measuring rod. The insertion ends of the first locking block 3 and the second locking block 4 are provided with a semi-circular groove that matches the shape of the measuring rod. A U-shaped pull ring with a retractable length is connected to the first locking block 3 near the semi-circular groove. One end of the U-shaped pull ring is slidably connected to the first locking block 3. The first locking block 3 located on the opposite side of the semi-circular groove is also provided with a strap 7. The strap 7 is connected to the other end of the U-shaped pull ring through a through hole. The second locking block 4 is provided with a pull ring groove that matches the U-shaped pull ring. The U-shaped pull ring and the pull ring groove are used together to make the semi-circular groove of the first locking block 3 and the semi-circular groove of the second locking block 4 splice into a circular locking groove that fits on the measuring rod. A threaded hole is provided on the first locking block 3 perpendicular to the vertical axis of the measuring rod. A screw 6 is provided in the threaded hole. The screw 6 passes through the threaded hole and abuts against the measuring rod.

[0047] Specifically, the semi-circular groove is equipped with an anti-slip layer for the purpose of preventing slipping.

[0048] How to use:

[0049] 1. Place the rotor to be tested on a special bracket, with the sealing teeth suspended in the air;

[0050] 2. Set up the measuring fixture at the sealing tooth, loosen the U-shaped buckle locking nut, move the dial indicator to align the dial indicator with the sealing tooth, and insert the sealing tooth into the groove of the dial indicator to fit the sealing tooth for measurement (it is recommended that the pressure gauge be >7mm). Lock the dial indicator and measure the value as a.

[0051] 3. Move the measuring device slightly along the axial direction so that the dial indicator head can contact the rotor hub surface, with a value of b;

[0052] 4. The height of the sealing tooth at this point is measured to be: ab

[0053] 5. If the sealing tooth is machined by a precision machine tool, the average value of four points (top, bottom, left, and right) can be calculated to determine the height of the sealing tooth of that grade.

[0054] 6. If the sealing teeth are machined manually or not by machine tools, the starting point of the measurement should be marked, and the measurement value of the high point of the sealing teeth should be marked and recorded along the circumference. The high point should be manually ground according to the deviation.

[0055] 7. Calculate the machining amount of the sealing teeth by comparing the original clearance with the design clearance value.

[0056] 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 fixture for detecting the height of a turbine rotor seal plate, comprising: A dial indicator (1) and a holder (2), wherein the dial indicator (1) extends longitudinally through the holder (2) and is connected to the holder (2), characterized in that the dial indicator (1) includes a measuring head, the measuring head being disposed below the holder (2), and the measuring head having grooves that mate with each sealing tooth; the measuring head rolls along the circumference of the sealing plate in each sealing tooth to determine the height of the sealing tooth; further comprising: The first roller (5) is configured as multiple, and the multiple first rollers (5) are symmetrically arranged on both sides of the measuring head along the center line of the measuring head. The width of each first roller (5) matches the width of the sealing gap between two adjacent sealing teeth.

2. The turbine rotor seal height detection fixture according to claim 1, characterized in that, The measuring head includes a cylindrical tube (8) and a second roller (9). The cylindrical tube (8) is located below the table frame (2), and the bottom of the cylindrical tube (8) is symmetrically provided with rectangular grooves along the vertical axis of the cylindrical tube (8). The second roller (9) is provided in the rectangular groove in the horizontal direction and is rotatably connected to the inner wall of the cylindrical tube (8). The groove is provided on the second roller (9).

3. The turbine rotor seal height detection fixture according to claim 1 or 2, characterized in that, The width of the groove is 1 mm.

4. The turbine rotor seal height detection fixture according to claim 1, characterized in that, The thickness of the first roller (5) is 3mm to 5mm.

5. The turbine rotor seal height detection fixture according to claim 1, characterized in that, There are four first rollers (5), and two first rollers (5) on the same side are connected to the frame (2) in a figure-eight shape.

6. A turbine rotor seal height detection fixture according to claim 1 or 2, characterized in that, The dial indicator (1) also includes a head and a measuring rod. The head is located above the frame (2), and the measuring rod extends vertically through the frame (2). The top of the measuring rod is connected to the head, and the bottom of the measuring rod is connected to the measuring head.

7. The turbine rotor seal height detection fixture according to claim 6, characterized in that, The top surface of the table frame (2) is also provided with a support platform along the horizontal direction. The top of the support platform is provided with a vertical through groove. The top of the table frame (2) is provided with a first through groove that communicates with the vertical through groove. The top of the measuring rod is located above the top surface of the vertical through groove. The bottom end of the measuring rod passes through the vertical through groove and the first through groove. Its protruding end is connected to the measuring head. The front and rear side walls of the support platform are provided with a second through groove that passes through the vertical through groove. The second through groove is provided with a limiting member for restricting the horizontal movement of the measuring rod. When the limiting member is connected to the measuring rod, the measuring rod cannot move in the horizontal direction. When the limiting member is not connected to the measuring rod, the measuring rod can move in the horizontal direction.

8. The turbine rotor seal height detection fixture according to claim 7, characterized in that, The length of the vertical through slot is greater than or equal to the length of the first through slot.

9. The turbine rotor seal height detection fixture according to claim 7, characterized in that, The limiting component includes a first locking block (3), a second locking block (4), and a screw. Both the first locking block (3) and the second locking block (4) can be inserted into the second through slot in a direction perpendicular to the axis of the measuring rod. The insertion ends of both the first locking block (3) and the second locking block (4) are provided with semi-circular grooves matching the shape of the measuring rod. A U-shaped pull ring with a retractable length is connected to the first locking block (3) near the semi-circular groove. One end of the U-shaped pull ring is slidably connected to the first locking block (3). The first locking block (3) located on the opposite side of the semi-circular groove also has... A strap (7) is provided, and the other end of the strap (7) is connected to the U-shaped pull ring through a through hole. The second locking block (4) is provided with a pull ring groove that matches the U-shaped pull ring. The U-shaped pull ring is used in conjunction with the pull ring groove to make the semi-arc groove of the first locking block (3) and the semi-arc groove of the second locking block (4) splice into a circular locking groove that fits on the measuring rod. A threaded hole is provided on the first locking block (3) perpendicular to the vertical axis of the measuring rod. A screw (6) is provided in the threaded hole. The screw (6) passes through the threaded hole and abuts against the measuring rod.

10. The turbine rotor seal height detection fixture according to claim 9, characterized in that, The semi-circular groove is equipped with an anti-slip layer.

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