Large-scale air-cooled generator rotor lead screw manufacturing and mounting process method

Abstract

The invention belongs to the field of assembly of turbo-generator rotors, and discloses a manufacturing and mounting process method for a lead screw of a large air-cooled generator rotor. The manufacturing period is shortened, the manufacturing cost is reduced, the mounting quality of the rotor lead screw of the large air-cooled generator is improved, and major quality accidents during operation of a unit are avoided.

Description

Technical Field

[0001] The invention belongs to the field of steam turbine generator rotor assembly, and in particular relates to a manufacturing and installation process method for a large air-cooled generator rotor lead screw. Background Art

[0002] Large air-cooled steam turbine generators are widely used in various power plants due to their advantages such as air as cooling medium, no sealing oil system, simple structure, and small footprint. In order to make the overall structure of the generator compact and improve product advantages, steam turbine generator manufacturers have optimized the rotor lead screws of large air-cooled generators. The lead screws of the new structure are connected to the conductive rods through tapered pipe threads, and the generator rotor leads and lead screws are designed as one, which reduces the installation process of the lead screws and rotor leads (the leads and lead screws can be produced in parallel), reduces the axial size of the rotor, and saves manufacturing costs. If the lead screws are not manufactured and installed correctly in the lead screw holes, the leads on the lead screws will not be aligned with the center line of the shaft. When the rotor winding is assembled, the leads and coils cannot be welded, and serious quality accidents such as lead screw breakage will occur when the unit is running.

[0003] In order to improve the installation efficiency of large air-cooled generator rotor lead screws, combined with the structure of large air-cooled generator rotor lead screws and leads integrated, a large air-cooled generator rotor lead screw manufacturing and installation process method is proposed, which saves manufacturing time and cost, improves the installation quality of large air-cooled generator rotor lead screws, and avoids major quality accidents during unit operation, which has great social significance. Summary of the invention

[0004] The present invention provides a manufacturing and installation process method for a large air-cooled generator rotor lead screw, which can improve the installation quality of the large air-cooled generator rotor lead screw. The method is implemented by the following steps:

[0005] S1. Preparation: Process the lead screw of the tool head, clean the thread of the lead screw of the tool head and the thread of the conductive rod, and draw the center line of the conductive rod at the hole of the lead screw of the conductive rod;

[0006] S2. First test assembly outside the shaft: screw the lead screw of the tool head into the thread of the conductive rod, tighten the lead screw of the tool head with torque a, mark A on the outer circle of the lead screw of the tool head along the center line of the conductive rod, and loosen the lead screw of the tool head with torque a;

[0007] S3. Second test assembly outside the rotating shaft: screw the lead screw of the tool head into the thread of the conductive rod, tighten the lead screw of the tool head with torque a, mark B on the outer circle of the lead screw of the tool head along the center line of the conductive rod, and loosen the lead screw of the tool head with torque a;

[0008] S4. Third test assembly outside the shaft: screw the lead screw of the tool head into the thread of the conductive rod, tighten the lead screw of the tool head with torque a, mark C on the outer circle position of the lead screw of the tool head along the center line of the conductive rod, and loosen the lead screw of the tool head with torque a;

[0009] S5. Fourth test assembly outside the rotating shaft: screw the lead screw of the tool head into the thread of the conductive rod, tighten the lead screw of the tool head with torque a, mark D on the outer circle of the lead screw of the tool head along the center line of the conductive rod, and loosen the lead screw of the tool head with torque a;

[0010] S6. Fifth test assembly outside the rotating shaft: screw the lead screw of the tool head into the thread of the conductive rod, tighten the lead screw of the tool head with torque a, mark E on the outer circle position of the lead screw of the tool head along the center line of the conductive rod, and loosen the lead screw of the tool head with torque a;

[0011] S7. Mark the lead screw lead welding position and the fastening position on the tool head lead screw according to the direction of the E mark, and process the tool head lead screw into a lead screw;

[0012] S8. Preparation work for assembly in the shaft: assemble the conductive rod in the shaft and weld the rotor lead wire on the lead screw;

[0013] S9, install the lead screw and the conductive screw, adjust the position of the conductive rod, insert the insulating tube and the insulating spacer into the lead screw, and screw the fixing nut at the shaft threaded hole into the shaft threaded hole;

[0014] S10, remove the lead screws and related assembly;

[0015] S11. Reinstall the lead screw and the insulating tube, tighten the lead screw with torque b, and tighten the lead screw again after one hour;

[0016] S12. Install the insulating spacer on the upper part of the lead screw and the fixing nut at the shaft hole, tighten the fixing nut, punch four points to fix it, and clean it.

[0017] In the above-mentioned large air-cooled generator rotor lead screw manufacturing and installation process method: in said S1, the lead screw head of the tool head is an outer hexagonal structure.

[0018] In the above-mentioned large air-cooled generator rotor lead screw manufacturing and installation process method: in said S1, the engaging thread between the tool head lead screw and the conductive rod is a tapered pipe thread.

[0019] In the above-mentioned large air-cooled generator rotor lead screw manufacturing and installation process method: in the above-mentioned S2, the torque a is a smaller torque value in the torque range of the drawing.

[0020] In the above-mentioned large air-cooled generator rotor lead screw manufacturing and installation process method: in the above-mentioned S9, when assembling the insulating tube and the insulating spacer, the gap between the inner diameter of the insulating tube and the insulating spacer and the outer diameter of the lead screw is checked.

[0021] In the above-mentioned large air-cooled generator rotor lead screw manufacturing and installation process method: in the above-mentioned S9, when assembling the insulating tube and the insulating spacer, the gap between the outer diameter of the insulating tube and the insulating spacer and the inner diameter of the shaft hole is checked.

[0022] In the above-mentioned large air-cooled generator rotor lead screw manufacturing and installation process method: in said S9, when assembling the insulating tube and the insulating spacer, check that the sharp angle plane of the inner circle of the lead screw is not in contact with the insulating spacer thereon.

[0023] In the above-mentioned large air-cooled generator rotor lead screw manufacturing and installation process method: In the above-mentioned S9, the fixing nut at the threaded hole of the rotating shaft is screwed into the threaded hole of the rotating shaft, and it is checked that the total effective thread length of the threaded hole on the rotating shaft is greater than the thread length of the fixing nut.

[0024] In the above-mentioned large air-cooled generator rotor lead screw manufacturing and installation process method: in the above-mentioned S11, the lead screw is tightened using torque b, and the torque b is a relatively medium torque value in the torque range of the drawing.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention is aimed at a new lead screw which is integrated with the lead wire and connected to the conductive rod thread through a tapered tube thread. The present invention deeply analyzes the manufacturing and installation process methods of the lead screws of the rotor of a large air-cooled generator, ensures the installation efficiency of the lead screws of the rotor of a large air-cooled generator, improves the installation quality of the lead screws of the rotor of a large air-cooled generator, improves the appearance of the lead screw product, and saves manufacturing time and manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the tool head lead screw;

[0028] Figure 2 This is a schematic diagram of the lead screw;

[0029] Figure 3 It is a schematic diagram of the fifth installation of the tool head lead screw and the conductive rod outside the rotating shaft;

[0030] Figure 4 This is a schematic diagram of the rotor lead screw being installed in the rotating shaft;

[0031] Markings in the figure: 1- tool head lead screw, 2- lead screw, 3- conductive rod, 4- conductive rod center line, 5- torque a, 6- mark A, 7- mark B, 8- mark C, 9- mark D,

[0032] 10-Mark E,

[0033] 11-rotor lead, 12-insulating tube, 13-insulating spacer, 14-fixing nut, 15-torque b. DETAILED DESCRIPTION

[0034] The present application is further described below in conjunction with the accompanying drawings. The following implementation examples are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present application.

[0035] This embodiment provides a method for manufacturing and installing rotor lead screws of a large air-cooled generator, which is implemented by the following steps:

[0036] S1. Preparation: Process the tool head lead screw 1, clean the thread of the tool head lead screw 1 and the thread of the conductive rod 3, avoid the copper filings between the thread of the tool head lead screw 1 and the conductive rod 3 affecting the actual matching effect between the tool head lead screw 1 and the conductive rod 3, draw the center line 4 of the conductive rod at the lead screw hole of the conductive rod 3, and leave the actual matching reference of the tool head lead screw 1 on the conductive rod 3.

[0037] S2. First trial assembly outside the rotating shaft: screw the tool head lead screw 1 into the thread of the conductive rod 3, tighten the tool head lead screw 1 with torque a5, mark A6 on the outer circle position of the tool head lead screw 1 along the center line 4 of the conductive rod, loosen the tool head lead screw 1 with torque a5, clean the thread of the tool head lead screw 1 and the thread of the conductive rod 3, avoid the copper filings between the thread of the tool head lead screw 1 and the conductive rod 3, which will affect the actual matching effect between the tool head lead screw 1 and the conductive rod 3.

[0038] S3. Second trial assembly outside the rotating shaft: screw the tool head lead screw 1 into the thread of the conductive rod 3, tighten the tool head lead screw 1 with torque a5, mark B7 on the outer circle position of the tool head lead screw 1 along the center line 4 of the conductive rod, loosen the tool head lead screw 1 with torque a5, clean the thread of the tool head lead screw 1 and the thread of the conductive rod 3, avoid the copper filings between the thread of the tool head lead screw 1 and the conductive rod 3, which will affect the actual matching effect between the tool head lead screw 1 and the conductive rod 3.

[0039] S4. The third trial assembly outside the rotating shaft: screw the tool head lead screw 1 into the thread of the conductive rod 3, tighten the tool head lead screw 1 with torque a5, mark C8 on the outer circle position of the tool head lead screw 1 along the center line 4 of the conductive rod, loosen the tool head lead screw 1 with torque a5, clean the thread of the tool head lead screw 1 and the thread of the conductive rod 3, avoid the copper filings between the thread of the tool head lead screw 1 and the conductive rod 3, which will affect the actual matching effect between the tool head lead screw 1 and the conductive rod 3.

[0040] S5. Fourth trial assembly outside the rotating shaft: screw the tool head lead screw 1 into the thread of the conductive rod 3, tighten the tool head lead screw 1 with torque a5, mark D9 on the outer circle position of the tool head lead screw 1 along the center line 4 of the conductive rod, loosen the tool head lead screw 1 with torque a5, clean the thread of the tool head lead screw 1 and the thread of the conductive rod 3, avoid the copper filings between the thread of the tool head lead screw 1 and the conductive rod 3, which will affect the actual matching effect between the tool head lead screw 1 and the conductive rod 3.

[0041] S6. Fifth trial assembly outside the rotating shaft: screw the tool head lead screw 1 into the thread of the conductive rod 3, tighten the tool head lead screw 1 with torque a5, mark E10 on the outer circle position of the tool head lead screw 1 along the center line 4 of the conductive rod, loosen the tool head lead screw 1 with torque a5, clean the thread of the tool head lead screw 1 and the thread of the conductive rod 3, avoid the copper filings between the thread of the tool head lead screw 1 and the conductive rod 3, which will affect the actual matching effect between the tool head lead screw 1 and the conductive rod 3.

[0042] S7. Mark the lead welding position and tightening position of lead screw 2 on tool head lead screw 1 according to the direction marked by E10, and process tool head lead screw 1 into lead screw 2 to avoid direct force on lead screw 2, thereby improving the product appearance of lead screw 2.

[0043] S8. Preparation work for assembly inside the shaft: Assemble the conductive rod 3 inside the shaft, weld the rotor lead 11 to the lead screw 2, and weld the lead screw 2 to the rotor lead 11 outside the shaft to prevent excess solder from flowing into the shaft, damaging the insulation at high temperature, and burying quality risks.

[0044] S9. Install the lead screw 2 and the conductive screw, accurately adjust the axial position of the conductive rod 3 relative to the rotating shaft, insert the insulating tube 12 and the insulating spacer 13 into the lead screw 2, and screw the fixing nut 14 at the shaft threaded hole into the shaft threaded hole.

[0045] S10, remove the lead screw 2 and related assemblies.

[0046] S11. Reinstall the lead screw 2 and the insulating tube 12, tighten the lead screw 2 with a torque of b15, and tighten the lead screw 2 again after one hour to prevent the lead screw 2 from loosening.

[0047] S12. Install the insulating spacer 13 and the fixing nut 14 at the shaft hole on the upper part of the lead screw 2, tighten the fixing nut 14, punch four points to fix it, and clean it so that the lead screw 2 does not move and improve the appearance of the lead screw 2 assembly.

[0048] Furthermore, in S1, the head of the tool head lead screw 1 is an external hexagonal structure, which is convenient for applying torque using a universal torque wrench, while avoiding directly applying the torque to the lead screw 2 and affecting the appearance of the lead screw 2.

[0049] like Figure 1 The structure of the tool head lead screw 1 is shown as follows: Figure 2 The structure of the lead screw 2 is shown. Compared with the tool head lead screw 1 with an outer hexagonal structure, the tool head lead screw 1 can be tightened using a universal torque wrench, and it is also convenient to mark the outer hexagon of the tool head lead screw 1 during subsequent mechanical processing.

[0050] Furthermore, in S1, the engaging thread between the tool head lead screw 1 and the conductive rod 3 is a tapered pipe thread.

[0051] like Figure 3 As shown, the tool head lead screw 1 and the conductive rod 3 are fastened by a tapered pipe thread. Compared with the pipe thread used in the same part of other steam turbine generators, the fastening structure is more reliable.

[0052] Furthermore, in S2, the torque a5 is a smaller torque value in the torque range of the drawing.

[0053] like Figure 3 As shown, when the tool head lead screw 1 and the conductive rod 3 are trial-assembled outside the rotating shaft, five tightenings are performed using a smaller torque value within the torque range of the drawing, which can effectively improve the matching clearance between the tool head lead screw 1 and the conductive rod 3 threads.

[0054] Furthermore, in S9, when assembling the insulating tube 12 and the insulating spacer 13, check the gap between the inner diameter of the insulating tube 12 and the insulating spacer 13 and the outer diameter of the lead screw 2 to avoid the lead screw 2 not being in the center of the insulating tube 12 and the insulating spacer 13 during the formal installation of the lead screw 2.

[0055] like Figure 4 As shown, when assembling the insulating tube 12 and the insulating spacer 13, check the gap between the inner diameter of the insulating tube 12 and the insulating spacer 13 and the outer diameter of the lead screw 2. The gap value should be uniform to ensure that the lead screw 2 is in the center of the insulating tube 12 and the insulating spacer 13 during formal assembly.

[0056] Furthermore, in S9, when assembling the insulating tube 12 and the insulating spacer 13, check the gap between the outer diameter of the insulating tube 12 and the insulating spacer 13 and the inner diameter of the shaft hole to avoid the lead screw 2 being unable to be installed into the center of the center hole of the shaft lead screw during the formal installation process of the lead screw 2.

[0057] like Figure 4 As shown, when assembling the insulating tube 12 and the insulating spacer 13, check the gap between the outer diameter of the insulating tube 12 and the insulating spacer 13 and the inner diameter of the shaft hole. The gap value should be uniform to ensure that the lead screw 2 is in the center of the shaft hole during formal assembly.

[0058] Furthermore, in S9, when assembling the insulating tube 12 and the insulating spacer 13, check that the sharp-angled plane of the inner circle of the lead screw 2 is not in contact with the insulating spacer 13 thereon, so as to avoid insulation damage of the insulating spacer 13 when the lead screw 2 is formally installed.

[0059] like Figure 4 As shown, when assembling the insulating tube 12 and the insulating spacer 13, check that the sharp-angled plane of the inner circle of the lead screw 2 does not contact the insulating spacer 13 thereon. If there is contact, the insulating tube 12 and the insulating spacer 13 will be damaged, thereby causing the lead screw 2 to have an insufficient discharge distance, resulting in a quality accident.

[0060] Furthermore, in S9, the fixing nut 14 at the threaded hole of the shaft is screwed into the threaded hole of the shaft, and it is checked that the total effective thread length of the threaded hole on the shaft is greater than the thread length of the fixing nut 14 to avoid the fixing nut 14 being unable to be installed in place when it is officially installed.

[0061] like Figure 4 As shown, if the effective thread length of the threaded hole on the shaft is smaller than the thread length of the fixing nut 14, the fixing nut 14 cannot be installed in place when it is officially installed, thereby failing to ensure the fastening strength between the fixing nut 14 and the shaft.

[0062] Furthermore, in S11, the lead screw 2 is tightened using a torque b15, and the torque b15 is a relatively medium torque value in the torque range of the drawing.

[0063] like Figure 4 As shown, the lead screw 2 is tightened in the shaft using a torque b15. The tightening is performed using a medium torque value in the torque range of the drawing, which can ensure that the final installation position of the lead screw 2 is consistent with the required direction, and improve the tightening state between the lead screw 2 and the conductive rod 3.

[0064] The present invention is only an exemplary description of the present invention and does not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A manufacturing and installation process for large air-cooled generator rotor lead screws, characterized in that: The method is implemented by the following steps: S1. Preparation: Process the lead screw (1) of the tool head, clean the thread of the lead screw (1) of the tool head and the thread of the conductive rod (3), and draw the center line of the conductive rod (4) at the lead screw hole of the conductive rod (3); S2. First test assembly outside the shaft: screw the lead screw (1) of the tool head into the thread of the conductive rod (3), tighten the lead screw (1) of the tool head using torque a (5), mark A (6) on the outer circle of the lead screw (1) of the tool head along the center line of the conductive rod (4), and loosen the lead screw (1) of the tool head using torque a (5); S3. Second test assembly outside the shaft: screw the lead screw (1) of the tool head into the thread of the conductive rod (3), tighten the lead screw (1) of the tool head using torque a (5), mark B (7) on the outer circle of the lead screw (1) of the tool head along the center line of the conductive rod (4), and loosen the lead screw (1) of the tool head using torque a (5); S4. Third test assembly outside the shaft: screw the lead screw (1) of the tool head into the thread of the conductive rod (3), tighten the lead screw (1) of the tool head using torque a (5), mark C (8) on the outer circle of the lead screw (1) of the tool head along the center line of the conductive rod (4), and loosen the lead screw (1) of the tool head using torque a (5); S5. Fourth test assembly outside the rotating shaft: screw the lead screw (1) of the tool head into the thread of the conductive rod (3), tighten the lead screw (1) of the tool head using torque a (5), mark D (9) on the outer circle of the lead screw (1) of the tool head along the center line of the conductive rod (4), and loosen the lead screw (1) of the tool head using torque a (5); S6. Fifth external test assembly of the rotating shaft: screw the lead screw (1) of the tool head into the thread of the conductive rod (3), tighten the lead screw (1) of the tool head using torque a (5), mark E (10) on the outer circle of the lead screw (1) of the tool head along the center line of the conductive rod (4), and loosen the lead screw (1) of the tool head using torque a (5); S7, marking the lead wire welding position and the fastening position of the lead screw (2) on the tool head lead screw (1) according to the direction marked by E (10), and processing the tool head lead screw (1) into the lead screw (2); S8, preparation work for assembly in the rotating shaft: assemble the conductive rod (3) in the rotating shaft, and weld the rotor lead (11) on the lead screw (2); S9, install the lead screw (2) and the conductive screw, adjust the position of the conductive rod (3), insert the insulating tube (12) and the insulating spacer (13) into the lead screw (2), and screw the fixing nut (14) at the shaft threaded hole into the shaft threaded hole; S10, remove the lead screw (2) and related assembly; S11. Reinstall the lead screw (2) and the insulating tube (12), tighten the lead screw (2) using torque b (15), and tighten the lead screw (2) again after one hour; S12. Install the insulating spacer (13) and the fixing nut (14) at the shaft hole on the upper part of the lead screw (2), tighten the fixing nut (14), punch four points to fix it, and clean it.

2. The manufacturing and installation process of a large air-cooled generator rotor lead screw according to claim 1 is characterized in that: In the above S1, the head of the tool head lead screw (1) is an external hexagonal structure.

3. The manufacturing and installation process of a large air-cooled generator rotor lead screw according to claim 1 is characterized in that: In the above S1, the engaging thread between the tool head lead screw (1) and the conductive rod (3) is a tapered pipe thread.

4. The manufacturing and installation process of a large air-cooled generator rotor lead screw according to claim 1 is characterized in that: In S2, the torque a(5) is a smaller torque value in the torque range of the drawing.

5. The manufacturing and installation process of a large air-cooled generator rotor lead screw according to claim 1 is characterized in that: In the above S9, when assembling the insulating tube (12) and the insulating spacer (13), the gap between the inner diameter of the insulating tube (12) and the insulating spacer (13) and the outer diameter of the lead screw (2) is checked.

6. The manufacturing and installation process of a large air-cooled generator rotor lead screw according to claim 1 is characterized in that: In the above S9, when the insulating tube (12) and the insulating spacer (13) are assembled, the clearance between the outer diameter of the insulating tube (12) and the insulating spacer (13) and the inner diameter of the shaft hole is checked.

7. The manufacturing and installation process of a large air-cooled generator rotor lead screw according to claim 1 is characterized in that: In the above S9, when assembling the insulating tube (12) and the insulating spacer (13), check that the sharp angle plane of the inner circle of the lead screw (2) is not in contact with the insulating spacer (13) thereon.

8. The manufacturing and installation process of a large air-cooled generator rotor lead screw according to claim 1 is characterized in that: In the above S9, the fixing nut (14) at the threaded hole of the rotating shaft is screwed into the threaded hole of the rotating shaft, and it is checked whether the effective thread length of the threaded hole on the rotating shaft is greater than the thread length of the fixing nut (14).

9. The manufacturing and installation process of a large air-cooled generator rotor lead screw according to claim 1, characterized in that: In S11, the lead screw (2) is tightened using a torque b (15), where the torque b (15) is a relatively medium torque value within the torque range shown in the drawing.

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