A process for centering and adjusting end components of large steam turbine generators

Abstract

The present invention discloses a process method for centering and adjusting the end components of a large steam turbine generator. By improving and innovating the process method of optical instrument centering, which is complex to operate and inefficient, a mechanical structure is used to replace the optical instrument to find the center of the stator core. The tool only extends out of the stator bore, does not affect the work of other stations, and occupies a small area. The operation is simple, the tool cost is significantly reduced, and the subsequent maintenance is convenient. The versatility and interchangeability are high, thereby avoiding the situation where the inner hole size of the end component is too small to find the center. The steam and excitation ends can work at the same time. After the measuring tool is installed, it does not conflict with the installation of the end component, and there is no need for subsequent adjustment of the tool, and there is no need for full-time personnel to monitor the adjustment status in real time. The adjustment amount is intuitively displayed on the end component, and there is no need for professionals to calculate and adjust the observation instrument according to the rotor lifting amount. The end component is easy to adjust and operate, which significantly improves production efficiency.

Description

Technical Field

[0001] The invention relates to the field of steam turbine generators, and in particular to a process for centering and adjusting end components of large steam turbine generators. Background Art

[0002] Before drilling and reaming the locating pin holes for the stator end components and stator base of large steam turbine generators in a manufacturing plant, the center of the stator core must be located on the end components. The end components are then repositioned based on the rotor lift. The end components are then bolted together, the reaming pin holes are drilled, and finally, the end components are secured to the stator base with locating pins. The existing process involves installing optical lenses on the inner circumference of the stator core end at the steam end, the inner circumference of the stator core end at the excitation end, and the inner circumference of the end components. A light source is installed at one end outside the stator bore, and an instrument is used to observe the light source at the other end outside the stator bore. The support frame is adjusted to align the optical lens with the center of the stator core, aligning them. Finally, the position of the observation instrument is calculated and adjusted based on the rotor lift, enabling measurement and adjustment at one end. The end components are then bolted together and the reaming pin holes are drilled. The light source and instrument are then swapped, and the same method is used to measure and adjust the other end. The end components are then bolted together and the reaming pin holes are drilled. This method of finding the center cannot work at the steam and excitation ends at the same time, and each time an end component is installed, an optical lens needs to be installed and adjusted inside the end component. During the adjustment process, a full-time person needs to monitor the observation instrument at all times, which is inefficient. The optical lens is expensive and difficult to maintain later. The end components of the steam turbine generator vary in size, and without a suitable support frame, it is impossible to find the center. Professionals are required to calculate and adjust the position of the observation instrument according to the rotor lift, which is difficult to operate. Summary of the Invention

[0003] In view of this, the present invention utilizes a mechanical structure instead of an optical method to locate the center of the stator core on the end member, and provides a centering and adjustment process method that meets usage requirements, occupies a small space, is highly efficient, is low-cost, has strong versatility, is easy to repair and maintain, allows for intuitive sizing adjustments, and is simple to operate. The technical solution of the present invention is specifically described as follows:

[0004] Step 1: Preparation: Assemble the end extension tool: Assemble the linear guide rail to the axial extension rod, assemble the distance measuring element on the outer ring of the bearing, assemble the slider to the linear guide rail and the inner ring of the bearing, and install the set screw. Assemble the triangular support tool: After installing the fine-tuning bolts, support columns and fine-tuning support blocks on the support blocks, use a tape measure to measure the distance A from the joint between the support block and the outer side of the support column to the fine-tuning support block. Assemble the end extension tool and triangular support tool on the steam end and excitation end cores respectively. At each triangular support tool, adjust the position of the axial extension rod in the stator core with the fine-tuning bolt, and use an inside micrometer to measure the distance B from the stator core to the four points on the same outer circumference of the axial extension rod;

[0005] Step 2: Install the end piece and mark the end piece measurement positions in the horizontal and vertical directions on the inner hole of the end piece;

[0006] Step 3: Move the slider to align the axial position of the distance measuring element on the bearing outer ring with the measuring position of the end piece, and lock the slider position with the set screw. Rotate the bearing outer ring to align the circumferential position of the distance measuring element on the bearing outer ring with the measuring position of the end piece, and record the position and value;

[0007] Step 4: Adjust the position of the end components according to the rotor lift amount and the measured value;

[0008] Step 5: Fasten the bolts on the end parts. Rotate the outer ring of the bearing, align the distance measuring element on the outer ring of the bearing with the circumferential position of the measuring position of the end parts, and re-measure the adjustment results.

[0009] Step 6: Drill the positioning pin hole for fixing the hinge end component;

[0010] Step 7: After all end components are installed and adjusted, remove all tools.

[0011] In the above-mentioned process method for centering the end components of a large steam turbine generator: in the step 1, the axial extension rod is made of aluminum alloy.

[0012] In the above-mentioned process method for centering the end components of a large steam turbine generator: in the step 1, the difference in the distance A measured at each triangular support tool does not exceed 1 mm.

[0013] In the aforementioned large-scale steam turbine generator end component centering process, in step 1, the end extension tool must be paired with two sets of triangular support tools. The two triangular support tools should be 0.5 meters apart, with the first triangular support tool on the steam end located at the beginning of the core, and the first triangular support tool on the excitation end located at the end of the core.

[0014] In the above-mentioned large steam turbine generator end component centering process method: in the step 1, on the inner side of each triangular support tool of the steam end, the difference in the value of the measured distance B between the outer circle of the axial extension rod and the stator core does not exceed 0.02mm.

[0015] In the above-mentioned large steam turbine generator end component centering process method: in the step 1, on the inner side of each triangular support tool machine at the excitation end, the difference in the value of the measured distance B between the outer circle of the axial extension rod and the stator core does not exceed 0.02 mm.

[0016] In the above-mentioned process for centering the end component of a large steam turbine generator: in the step 2, the horizontal and vertical positions marked on the measurement position of the end component should be located on the same circumference of the end component.

[0017] Due to the adoption of the above solution, the beneficial effects of the present invention are:

[0018] 1. The tool has low manufacturing costs, simple operation, strong versatility, and convenient subsequent maintenance. It is not limited by the internal hole size of the end component. As long as the required operation is met, a mechanical structure is used instead of optical instruments to locate the stator core center. This simple operation significantly reduces tool costs, facilitates subsequent maintenance, and offers strong versatility and high interchangeability. It avoids the situation where the internal hole size of the end component is too small to find the center, saving time during power plant unit installation and having certain social significance.

[0019] 2. End-piece adjustment is intuitively displayed, significantly improving production efficiency. The steam and excitation ends can operate simultaneously. Once the measuring tool is installed, it does not conflict with the end-piece installation, eliminating the need for subsequent tool adjustments or dedicated personnel to monitor adjustments in real time. Adjustment is intuitively displayed on the end-piece, eliminating the need for specialized personnel to calculate and adjust observation instruments based on rotor lift, making end-piece adjustment and operation easy.

[0020] 3. Small footprint. The tool only extends outside the stator chamber and does not affect the work of other stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the process principle for centering and adjusting the end components of a steam turbine generator;

[0022] Figure 2 This is a schematic diagram of the steam turbine generator end extension tool;

[0023] Figure 3 This is a schematic diagram of the triangular support tool;

[0024] Figure 4 Schematic diagram of the measurement position of the end parts.

[0025] Explanation of the marks in the figure: 1-axial extension rod, 2-linear guide, 3-bearing, 4-slider, 5-distance measuring element, 6-setting screw, 7-support block, 8-fine-tuning bolt, 9-support column, 10-fine-tuning support block, 11-distance A, 12-triangular support tool, 13-end extension tool, 14-distance B, 15-end component measuring position, 16-locating pin hole. DETAILED DESCRIPTION

[0026] The present application will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present application.

[0027] This embodiment provides a process for centering and adjusting the end components of a large steam turbine generator, which is implemented by the following steps:

[0028] Step 1: Preparation: Assemble the end extension tool 13: The diameter of the axial extension rod 1 can be a fixed value, or it can be made into a stepped shape with high coaxiality of each cylindrical surface, such as Figure 2 As shown, grooves for assembling the linear guide 2 are symmetrically machined on both sides of the axial extension rod 1, and the linear guide 2 is assembled into the groove 1 of the axial extension rod. A groove for assembling the distance measuring element 5 is machined on the outer ring of the bearing 3, and the distance measuring element 5 is installed in the outer ring of the bearing 3. The slider 4 is annular on the inner side of the machine, and has an interference fit with the inner ring of the bearing 3. The slider 4 is first assembled with the inner ring of the bearing 3, and then assembled with the slider of the linear guide 2, and the set screw 6 is installed. Assemble the triangular support tool 12: After installing the fine-tuning bolt 8, support column 9 and fine-tuning support block 10 on the support block 7, use the tape measure 12 to measure the distance A11 from the outer side of the support block 7 and the support column 9 to the end of the fine-tuning support block, as shown Figure 3 As shown. Figure 1 As shown, the end extension tool 13 and the triangular support tool 12 are respectively assembled on the steam end and the excitation end core. At each triangular support tool 12, the position of the axial extension rod 1 in the stator core is adjusted by the fine-tuning bolt 8, as shown in FIG. Figure 1 As shown, the distance B14 between four points on the same outer circumference of the axial extension rod 1 and the stator core is measured using an inside micrometer 13.

[0029] Step 2: Install the end piece and mark the end piece measurement position 15 in the horizontal and vertical directions on the inner hole of the end piece to facilitate the subsequent accurate measurement of the sensor, such as Figure 4 shown.

[0030] Step 3: Move slider 4 to align the distance measuring element 5 on the outer ring of bearing 3 axially with the measuring position 15 on the end piece. Lock the position of slider 4 with set screw 6. Rotate the outer ring of bearing 3 to align the distance measuring element 5 on the outer ring of bearing 3 circumferentially with the measuring position 15 on the end piece. Record the position and value.

[0031] Step 4: Based on the rotor lift and the measured value, the position of the end component can be adjusted intuitively.

[0032] Step 5: Fasten the bolts on the end parts. Rotate the outer ring of bearing 3, align the distance measuring element 5 on the outer ring of bearing 3 with the circumferential position of the measuring position 15 of the end parts, and re-measure the adjustment results to ensure the adjustment is accurate.

[0033] Step 6: Drill the positioning pin hole 16 for fixing the hinge end component.

[0034] Step 7: After all end components are installed and adjusted, remove all tools.

[0035] Furthermore, in step 1, the axial extension rod 1 is made of aluminum alloy. In this step, the axial extension rod 1 has a low weight and high strength, which is extremely important for the accuracy of the subsequent centering of the turbine generator end component.

[0036] Furthermore, in step 1, the difference in distance A11 measured at each triangular support tool 12 should not exceed 1 mm, facilitating subsequent fine-tuning of the center position of the axial extension rod 1 within the stator bore. This step shortens the time required for subsequent fine-tuning and centering of the axial extension rod 1 within the stator bore. The surface of the stator core used to mount the triangular support tool 12 should be clean to prevent the measurement results from being affected by stator core glue or contamination. This prevents external factors from affecting the centering of the turbine generator end components.

[0037] Furthermore, in step 1, the end extension tool 13 must be paired with two sets of triangular support tools 12. The two triangular support tools 12 should be 0.5m apart, with the first triangular support tool 12 on the steam end positioned at the beginning of the core, and the first triangular support tool 12 on the excitation end positioned at the end of the core. Ensuring the stability of the end extension tool 13 ensures accurate measurement results. This step ensures the stability of the measurement mechanism within the generator stator bore.

[0038] Furthermore, in step 1, the measured distance B14 between the outer diameter of the axial extension rod 1 and the stator core on the inside of each triangular support tool 12 at the steam end should not differ by more than 0.02 mm. This step ensures that the axial extension rod 1 is centered on the stator core, serving as a reference for subsequent centering of the turbine generator end components.

[0039] Furthermore, in step 1, the measured distance B14 between the outer circle of the axial extension rod 1 and the stator core on the inner side of each triangular support tool 12 at the excitation end should not differ by more than 0.02 mm. This step serves to recheck that the axial extension rod 1 is located at the center of the stator core.

[0040] Furthermore, in step 2, the horizontal and vertical positions marked on the end member measurement position 15 should be located on the same circumference of the end member. This step is to ensure that the generator end member measurement position and position adjustment are accurate.

[0041] The present invention is only an exemplary description of the present invention and does not limit its scope of protection. Those skilled in the art may also make partial changes thereto. As long as they do not exceed the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A process for centering and adjusting the end components of a large steam turbine generator. Its characteristics include the following steps: Step 1: Prepare the assembly end extension tool (13): Assemble the linear guide (2) onto the axial extension rod (1), assemble the distance measuring element (5) onto the outer ring of the bearing (3), assemble the slider (4) with the linear guide (2) and the inner ring of the bearing (3), and install the set screw (6); Assemble the triangular support tool (12): After installing the fine-tuning bolt (8), the support column (9) and the fine-tuning support block (10) on the support block (7), use a tape measure to measure the distance A (11) from the outer joint of the support block (7) and the support column (9) to the fine-tuning support block; Assemble the end extension tool (13) and the triangular support tool (12) on the steam end and the excitation end core respectively, and adjust the position of the axial extension rod (1) in the stator core at each triangular support tool (12) by the fine-tuning bolt (8), and use an inside micrometer to measure the distance B (14) from four points on the same outer circumference of the axial extension rod (1) to the stator core; Step 2: Install the end piece and mark the end piece measurement positions in the horizontal and vertical directions on the inner hole of the end piece (15); Step 3: Move the slider (4) to align the axial position of the distance measuring element (5) on the outer ring of the bearing (3) with the end piece measuring position (15), and lock the position of the slider (4) with the set screw (6); rotate the outer ring of the bearing (3), align the circumferential position of the distance measuring element (5) on the outer ring of the bearing (3) with the end piece measuring position (15), and record the position and value; Step 4: Adjust the position of the end components according to the rotor lift amount and the measured value; Step 5: Fasten the bolts of the end component and rotate the outer ring of the bearing (3), align the distance measuring element (5) on the outer ring of the bearing (3) with the circumferential position of the end component measuring position (15), and re-measure the adjustment results; Step 6: Drill the positioning pin hole (16) for fixing the hinge end component; Step 7: After all end components are installed and adjusted, remove all tools.

2. A large steam turbine generator end component centering and adjustment process according to claim 1, characterized in that: In the step 1, the axial extension rod (1) is made of aluminum alloy.

3. A method for centering and adjusting end components of a large steam turbine generator according to claim 1, characterized in that: In the step 1, the difference in the distance A (11) measured at each triangular support tool (12) does not exceed 1 mm.

4. A method for centering and adjusting a large steam turbine generator end component according to claim 1, characterized in that: In step 1, the end extension tool (13) needs to be matched with two sets of triangular support tools (12), the distance between the two triangular support tools (12) should be 0.5m, and the first triangular support tool (12) at the steam end should be located at the first section of the core, and the first triangular support tool (12) at the excitation end should be located at the last section of the core.

5. A method for centering and adjusting end components of a large steam turbine generator according to claim 1, characterized in that: In the step 1, the difference in the value of the measured distance B (14) between the outer circle of the axial extension rod (1) and the stator core on the inner side of each triangular support tool (12) at the steam end does not exceed 0.02 mm.

6. A method for centering and adjusting end components of a large steam turbine generator according to claim 1, characterized in that: In the step 1, on the inner side of each triangular support tool (12) at the excitation end, the difference in the value of the measured distance B (14) between the outer circle of the axial extension rod (1) and the stator core does not exceed 0.02 mm.

7. A method for centering and adjusting end components of a large steam turbine generator according to claim 1, characterized in that: In the second step, the horizontal and vertical positions marked on the end piece measurement position (15) should be located on the same circumference of the end piece.

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