A turbine rotor alignment tool and a method of alignment thereof

Abstract

The present application relates to the technical field of steam turbine, disclose a kind of steam turbine rotor centering tool and its centering method, the steam turbine rotor centering tool includes measuring rod, connecting flange and pad;The one end of the measuring rod is connected with the connecting flange, the other end of the measuring rod is connected with the pad;The connecting flange is used to be connected with the intermediate shaft backrest wheel;The pad is used to install measuring equipment, and the measuring equipment is used to measure the end face runout data and the circumferential surface runout data of the rotor backrest wheel to be centered;Multiple stirrups are obliquely arranged between the connecting flange and the measuring rod, and the two ends of the stirrup are connected with the connecting flange and the measuring rod respectively.The present application can effectively improve the structure rigidity, centering accuracy and centering efficiency of the centering tool.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, and more specifically, to a steam turbine rotor centering tool and its centering method. Background Technology

[0002] Currently, the dynamic balancing test assembly centering of large steam turbine rotors is based on the drive center (e.g., intermediate shaft). The runout of the rotor's back wheel end face and outer circumferential surface is detected by centering tools to determine the positional deviation between the rotor and the drive center. The bearing housing is then adjusted in the height and horizontal directions to achieve alignment of the axis center.

[0003] However, traditional centering tools lack rigidity and are prone to deformation and shaking during the centering process, which can lead to measurement errors and affect the accuracy of the centering results, resulting in low centering precision. At the same time, the centering process generally relies on manual calculation to determine the centering parameters of the bearing housing, which not only involves a large amount of calculation work, but also easily causes calculation errors, resulting in low centering precision and low centering efficiency. Summary of the Invention

[0004] The technical objective of this invention is to address the shortcomings of the prior art by providing a turbine rotor centering tool and its centering method that effectively improves the structural rigidity, centering accuracy, and centering efficiency of the centering tool.

[0005] The first technical solution adopted in this invention is as follows: A turbine rotor centering tool, comprising a measuring rod, a connecting flange, and a pad; One end of the measuring rod is connected to the connecting flange, and the other end of the measuring rod is connected to the pad block; The connecting flange is used to connect to the intermediate shaft back wheel; the pad is used to install measuring equipment, which is used to measure the end face runout data and circumferential surface runout data of the back wheel of the rotor to be located. Multiple tie rods are obliquely arranged between the connecting flange and the measuring rod, and the two ends of the tie rods are respectively connected to the connecting flange and the measuring rod.

[0006] The above-mentioned technical measures connect the connecting flange to the back wheel of the intermediate shaft, thereby fixing the centering tool to the intermediate shaft. The end face runout and circumferential runout data of the back wheel of the rotor to be centered are measured by the measuring equipment, and the positional deviation between the center of the rotor to be centered and the center of the intermediate shaft is calculated. By setting multiple tie rods diagonally between the connecting flange and the measuring rod, the rigidity of the measuring rod is enhanced, the bending resistance is improved, and the deformation of the measuring rod during the centering process is effectively suppressed, ensuring the measurement stability and reliability of the measuring equipment, thereby improving the centering accuracy and efficiency.

[0007] Furthermore, the measuring rod has a hollow structure.

[0008] The above-mentioned technical measures, by setting the measuring rod as a hollow structure, can reduce the weight of the centering tool while ensuring structural strength, making it easier to handle, disassemble and install.

[0009] Furthermore, the length of the measuring rod is adapted to the distance between the intermediate shaft backrest wheel and the backrest wheel of the rotor to be located.

[0010] The above-mentioned technical measures can help avoid adjusting the axial position of the bearing housing after centering, thus preventing new deviations.

[0011] Furthermore, the cross-section of the pad along its length is a T-shaped structure; The pad includes an integrally formed horizontal portion and a vertical portion, the vertical portion being connected to the measuring rod.

[0012] The above-mentioned technical measures can reduce material usage, lighten the burden on the measuring rod, and improve stability while ensuring the connection stability between the pad and the measuring rod.

[0013] Furthermore, the transverse portion is provided with a plurality of threaded holes, which are used for mounting measuring equipment.

[0014] Furthermore, the measuring device includes an extension rod and a measuring instrument, the measuring instrument being mounted on the extension rod, and the extension rod being mounted inside the threaded hole.

[0015] The above-mentioned technical measures allow for the installation of extension rods via threaded holes, facilitating assembly and disassembly.

[0016] Furthermore, the connecting flange and the intermediate shaft back wheel are positioned by a stop fit and are fixedly connected by bolts.

[0017] The above-mentioned technical measures connect the flange and the intermediate shaft through a stop fit for positioning, and then fix them together with bolts. This can prevent loosening or displacement during the centering process, and improve safety and centering accuracy.

[0018] The second technical solution adopted in this invention is as follows: A method for centering a turbine rotor as described in technical solution one above, the method comprising the following steps: Step S1: Obtain the rotor model of the rotor to be found, and perform matching in a preset matching database based on the rotor model. The matching database includes the rotor model and the corresponding bearing housing matching parameters. If the matching is successful, adjust the bearing housing of the rotor to be found based on the corresponding bearing housing matching parameters. If the matching fails, proceed to the next step. Step S2: Connect the connecting flange to the back wheel of the intermediate shaft, so that the measuring device contacts the end face and circumferential surface of the back wheel of the rotor to be found, drive the intermediate shaft to rotate 360°, and obtain the runout data of the end face and circumferential surface at the positions of 0°, 90°, 180° and 270° respectively. Step S3: Based on the runout data of the end face and circumferential surface at 0° and 180° positions, calculate the adjustment parameters of the bearing housing in the height direction through the program; based on the runout data of the end face and circumferential surface at 90° and 270° positions, calculate the adjustment parameters of the bearing housing in the horizontal direction through the program; and adjust the bearing housing based on the adjustment parameters of the bearing housing in the height direction and the adjustment parameters of the bearing housing in the horizontal direction. Step S4: Obtain the bearing housing centering parameters after adjustment and store them in the centering database, then update the centering database.

[0019] The above-mentioned technical measures can achieve centering-free operation of rotors of the same type by using a preset centering database to match them, thus effectively improving centering efficiency. By calculating the adjustment parameters of the bearing housing in the height and horizontal directions through the program, the amount of manual calculation can be reduced and human error can be eliminated, thereby improving centering efficiency and accuracy, and providing theoretical support for rotor centering under dynamic working conditions.

[0020] Furthermore, the procedure before step S2 includes: Step S11: Start the turbine jacking oil system to move the rotor to be aligned toward the center of the bearing housing for automatic alignment. After automatic alignment, shut down the turbine jacking oil system.

[0021] The above-mentioned technical measures, by activating the turbine jacking oil system before centering, form a static pressure oil film between the bearing and the rotor to be centered, significantly reducing friction and causing the rotor to be centered to be suspended in a state and automatically move towards the center of the bearing housing under the action of gravity, thus achieving automatic alignment; by closing the turbine jacking oil system, the rotor position can be locked, avoiding deviations during measurement and adjustment, and improving the effectiveness and stability of centering and adjustment.

[0022] Furthermore, the procedure before step S2 includes: Step S12: Obtain the axis trajectory formed by the rotor journal center as the rotor rotates with the change of rotation speed, obtain the offset range of the rotor in the height direction and the horizontal direction, and adjust the position of the bearing seat based on the offset range.

[0023] The above technical measures are based on the principle that the center of the rotor journal will shift to a certain extent when the rotor rotates. The position of the bearing housing is adjusted before centering, which effectively improves the centering accuracy.

[0024] One or more technical solutions provided by this invention have at least the following technical effects or advantages: This invention connects the connecting flange to the back wheel of the intermediate shaft, thereby fixing the centering tool to the intermediate shaft. The end face runout and circumferential runout data of the back wheel of the rotor to be centered are measured using a measuring device, and the positional deviation between the center of the rotor to be centered and the center of the intermediate shaft is calculated. By obliquely installing multiple tie rods between the connecting flange and the measuring rod, the rigidity of the measuring rod is enhanced, its bending resistance is improved, and deformation of the measuring rod during the centering process is effectively suppressed, ensuring the measurement stability and reliability of the measuring device, thereby improving the centering accuracy.

[0025] This invention utilizes a preset centering database to match rotors to be centered, enabling rotors of the same type to be centered without centering, thus effectively improving centering efficiency. By calculating the adjustment parameters of the bearing housing in the height and horizontal directions through a program, the amount of manual calculation can be reduced, eliminating human error, thereby improving centering efficiency and accuracy, and providing theoretical support for rotor centering under dynamic working conditions.

[0026] This invention activates the turbine jacking oil system before centering, forming a hydrostatic oil film between the bearing and the rotor to be centered. This significantly reduces friction, causing the rotor to be centered to be suspended and automatically move towards the center of the bearing housing under gravity, thus achieving automatic alignment. By shutting down the turbine jacking oil system, the position of the rotor to be centered can be locked, preventing deviations during measurement and adjustment, and improving the effectiveness and stability of centering and adjustment.

[0027] This invention is based on the principle that the center of the rotor journal will shift to a certain extent when the rotor rotates. The bearing housing is adjusted before centering, which effectively improves the centering accuracy. Attached Figure Description

[0028] The accompanying drawings, which are provided to further illustrate embodiments of the invention and constitute a part of this invention, are not intended to limit the scope of the invention. Figure 1 This is a schematic diagram of one structure of the center-finding tool in this invention; Figure 2 This is a top view of the center-finding tool in this invention; Among them, 1-measuring rod; 2-connecting flange; 3-pad; 4-stirring bar. Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0031] Reference Figures 1-2 This embodiment provides a turbine rotor centering tool, which includes a measuring rod 1, a connecting flange 2, and a pad 3; One end of the measuring rod 1 is connected to the connecting flange 2, and the other end of the measuring rod 1 is connected to the pad 3; the measuring rod 1 can be connected to the connecting flange 2 by welding.

[0032] The connecting flange 2 is used to connect to the intermediate shaft back wheel; the pad 3 is used to install the measuring equipment, which is used to measure the end face runout data and circumferential surface runout data of the back wheel of the rotor to be located. Multiple tie rods 4 are obliquely arranged between the connecting flange 2 and the measuring rod 1, with both ends of the tie rods 4 connected to the connecting flange 2 and the measuring rod 1, respectively.

[0033] The tie rod 4 is connected to the connecting flange 2 and the measuring rod 1 by welding. There can be 4 tie rods, which are evenly arranged.

[0034] Measuring rod 1 has a hollow structure and is made of high-quality carbon steel.

[0035] The length of measuring rod 1 is adapted to the distance between the back wheel of the intermediate shaft and the back wheel of the rotor to be located.

[0036] The cross-section of the pad 3 along its length is a T-shaped structure; the length direction of the pad 3 is the same as the length direction of the measuring rod 1.

[0037] The pad 3 includes an integrally formed horizontal part and a vertical part, with the vertical part connected to the measuring rod.

[0038] The vertical section is connected to the measuring rod by welding.

[0039] The horizontal section has multiple threaded holes for mounting measuring equipment.

[0040] The measuring device includes an extension rod and a measuring instrument. The measuring instrument is mounted on the extension rod, and the extension rod is installed inside the threaded hole.

[0041] The extension rod has an external thread that mates with the threaded hole. The measuring instrument can be a high-precision measuring instrument such as a digital dial indicator or a laser probe.

[0042] The connecting flange 2 and the intermediate shaft back wheel are positioned by a stop fit and are fixedly connected by bolts.

[0043] The bolts can be socket head cap screws. The stop fit structure adopts a conventional design, and this embodiment does not impose specific limitations.

[0044] This embodiment also proposes a centering method based on the above-mentioned turbine rotor centering tool, which includes the following steps: Step S1: Obtain the rotor model of the rotor to be found, and match it in the preset matching database based on the rotor model. The matching database includes the rotor model and the corresponding bearing housing matching parameters. If the match is successful, adjust the bearing housing of the rotor to be found based on the corresponding bearing housing matching parameters. If the match fails, proceed to the next step. This involves acquiring bearing housing alignment parameters from multiple historical rotor alignment tests and constructing an alignment database based on the rotor model and corresponding bearing housing alignment parameters. The bearing housing alignment parameters include the relative position of the bearing housing and guide rail after rotor alignment, the thickness of the bearing housing shims, and the clearance values ​​on both sides.

[0045] Step S2 includes the following: Step S11: Start the turbine jacking oil system to move the rotor to be aligned toward the center of the bearing housing for automatic alignment. After automatic alignment, shut down the turbine jacking oil system.

[0046] Step S2 includes the following: Step S12: Obtain the axis trajectory formed by the rotor journal center as the rotor rotates with the change of rotation speed, obtain the offset range of the rotor in the height direction and the horizontal direction, and adjust the position of the bearing housing based on the offset range.

[0047] The axis trajectory is obtained by analyzing multiple sets of historical test data, and will not be described in detail in this embodiment.

[0048] Step S2: Connect the connecting flange 2 to the back wheel of the intermediate shaft, so that the measuring device contacts the end face and circumferential surface of the back wheel of the rotor to be found, drive the intermediate shaft to rotate 360°, and obtain the runout data of the end face and circumferential surface at the positions of 0°, 90°, 180° and 270° respectively. Step S3: Based on the runout data of the end face and circumferential surface at 0° and 180° positions, calculate the adjustment parameters of the bearing housing in the height direction through the program; based on the runout data of the end face and circumferential surface at 90° and 270° positions, calculate the adjustment parameters of the bearing housing in the horizontal direction through the program; and adjust the bearing housing based on the adjustment parameters of the bearing housing in the height direction and the adjustment parameters of the bearing housing in the horizontal direction. Step S4: Obtain the bearing housing centering parameters after adjustment and store them in the centering database, then update the centering database.

[0049] Specifically, in this embodiment, the rotor to be located is equipped with two bearing seats, namely bearing seat one and bearing seat two. Bearing seat two is closer to the back wheel of the rotor to be located than bearing seat one. Taking the height adjustment as an example, with upward as positive, the runout data of the circumferential surface at the positions of 0°, 90°, 180° and 270° are A1, A2, A3 and A4, respectively, and the runout data of the end face at the positions of 0°, 90°, 180° and 270° are B1, B2, B3 and B4, respectively. The specific steps for the program to calculate and adjust the adjustment parameters of the rotor bearing seat in the height direction are as follows: First, calculate the adjustment amount represented by the end face runout. Taking bearing housing one as the fulcrum, the adjustment amount caused by the end face runout of bearing housing one is then calculated. Adjustment amount caused by end face runout of bearing housing 2 Because adjusting bearing housing two will cause a change in the height of the runout detection position, the amount of height change... Next, calculate the adjustment amount of the bearing housing caused by circumferential surface runout and height changes. Adjustment amount of bearing housing , Finally, calculate the adjustment amount of bearing housing 1 in the height direction. Adjustment amount of bearing housing 2 in the height direction , ; .

[0050] in, The axial distance between the centers of bearing housing one and bearing housing two. This is the axial distance between bearing housing 2 and the end face runout detection position. The diameter of the circle where the end face runout detection position is located.

[0051] The calculation method for horizontal adjustment is the same as that for vertical adjustment, and will not be described in detail in this embodiment.

[0052] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0053] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A turbine rotor centering tool, characterized in that: The turbine rotor centering tool includes a measuring rod (1), a connecting flange (2), and a pad (3); One end of the measuring rod (1) is connected to the connecting flange (2), and the other end of the measuring rod (1) is connected to the pad (3); The connecting flange (2) is used to connect to the intermediate shaft back wheel; the pad (3) is used to install the measuring device, which is used to measure the end face runout data and circumferential runout data of the back wheel of the rotor to be found; Multiple tie rods (4) are obliquely arranged between the connecting flange (2) and the measuring rod (1), and the two ends of the tie rods (4) are connected to the connecting flange (2) and the measuring rod (1) respectively.

2. The turbine rotor alignment tool according to claim 1, characterized in that: The measuring rod (1) has a hollow structure.

3. The turbine rotor alignment tool according to claim 1, characterized in that: The length of the measuring rod (1) is adapted to the distance between the intermediate shaft back wheel and the rotor back wheel to be located.

4. The turbine rotor alignment tool according to claim 1, characterized in that: The cross-section of the pad (3) along its length is a T-shaped structure; The pad (3) includes an integrally formed horizontal part and a vertical part, the vertical part being connected to the measuring rod.

5. The turbine rotor centering tool according to claim 4, characterized in that: The transverse portion is provided with multiple threaded holes, which are used to install measuring equipment.

6. The turbine rotor centering tool according to claim 5, characterized in that: The measuring device includes an extension rod and a measuring instrument, the measuring instrument being mounted on the extension rod, and the extension rod being installed inside the threaded hole.

7. The turbine rotor alignment tool according to claim 1, characterized in that: The connecting flange (2) and the intermediate shaft back wheel are positioned by a stop fit and are fixedly connected by bolts.

8. A centering method based on the turbine rotor centering tool according to any one of claims 1 to 7, characterized in that: The method for finding the center includes the following steps: Step S1: Obtain the rotor model of the rotor to be found, and perform matching in a preset matching database based on the rotor model. The matching database includes the rotor model and the corresponding bearing housing matching parameters. If the matching is successful, adjust the bearing housing of the rotor to be found based on the corresponding bearing housing matching parameters. If the matching fails, proceed to the next step. Step S2: Connect the connecting flange (2) to the back wheel of the intermediate shaft, so that the measuring device contacts the end face and circumferential surface of the back wheel of the rotor to be found, drive the intermediate shaft to rotate 360°, and obtain the runout data of the end face and circumferential surface at 0°, 90°, 180° and 270° respectively. Step S3: Based on the runout data of the end face and circumferential surface at 0° and 180° positions, calculate the adjustment parameters of the bearing housing in the height direction through the program; based on the runout data of the end face and circumferential surface at 90° and 270° positions, calculate the adjustment parameters of the bearing housing in the horizontal direction through the program; and adjust the bearing housing based on the adjustment parameters of the bearing housing in the height direction and the adjustment parameters of the bearing housing in the horizontal direction. Step S4: Obtain the bearing housing centering parameters after adjustment and store them in the centering database, then update the centering database.

9. The center-finding method according to claim 8, characterized in that: The procedure preceding step S2 also includes: Step S11: Start the turbine jacking oil system to move the rotor to be aligned toward the center of the bearing housing for automatic alignment. After automatic alignment, shut down the turbine jacking oil system.

10. The center-finding method according to claim 9, characterized in that: The procedure preceding step S2 also includes: Step S12: Obtain the axis trajectory formed by the rotor journal center as the rotor rotates with the change of rotation speed, obtain the offset range of the rotor in the height direction and the horizontal direction, and adjust the position of the bearing seat based on the offset range.

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