A process for installing rotor lead screws of large air-cooled generators

Abstract

The present invention relates to the field of steam turbine generator rotor assembly and discloses a process for installing lead screws on large air-cooled generator rotors. Based on the structure of large air-cooled generator rotors where the lead screws are integrated with the lead wires, this application proposes a process for installing lead screws on large air-cooled generator rotors. This method reduces manufacturing time and costs, improves the installation quality of lead screws on large air-cooled generator rotors, and prevents major quality accidents during unit operation.

Description

Technical Field

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

[0002] Large air-cooled steam turbine generators are widely used in power plants due to their advantages, such as using air as a cooling medium, lacking a sealing oil system, having a simple structure, and occupying a small space. To make the overall structure of the generator compact and enhance 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 via tapered pipe threads, integrating the generator rotor leads and lead screws into one design. This reduces the installation process of the lead screws and rotor leads (the leads and lead screws can be produced in parallel), reduces the axial dimensions 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 centerline of the shaft. During the assembly of the rotor winding, the leads and coils cannot be welded, and serious quality accidents such as lead screw breakage will occur during unit operation.

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

[0004] The present invention provides a process for installing lead screws on a large air-cooled generator rotor, which 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 mark the center line of the conductive rod at the lead screw hole 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 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 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. 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 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 position mark E, and process the tool head lead screw into a lead screw;

[0012] S8: Preparation for assembly in the shaft: Assemble the conductive rod in the shaft and weld the rotor lead to 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 screw;

[0015] S11: Reinstall the lead screw and insulation tube, tighten the lead screw with torque a, and tighten the lead screw again after one hour;

[0016] S12: Install the insulating spacer and the fixing nut on the shaft hole on the upper part of the lead screw, 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 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 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 installation process method: in said 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.

[0020] In the above-mentioned large air-cooled generator rotor lead screw installation process method: in said 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.

[0021] In the above-mentioned large air-cooled generator rotor lead screw installation process method: in said S9, when assembling the insulating tube and the insulating spacer, it is also necessary to check that the sharp angle plane of the inner circle of the lead screw does not contact the insulating spacer above it.

[0022] In the above-mentioned large air-cooled generator rotor lead screw installation process method: in said 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 effective thread length of the threaded hole on the rotating shaft is greater than the thread length of the fixing nut.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention is aimed at a new lead screw in which the lead screw and the lead are integrated and connected to the conductive rod thread through a tapered tube thread. The invention deeply analyzes the installation process method of the lead screw of the rotor of a large air-cooled generator, ensures the installation efficiency of the lead screw of the rotor of a large air-cooled generator, improves the installation quality of the lead screw of the rotor of a large air-cooled generator, improves the appearance of the lead screw product, and saves manufacturing time and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the tool head lead screw;

[0026] Figure 2 This is a schematic diagram of the lead screw;

[0027] Figure 3 This is a schematic diagram of the fifth installation of the tool head lead screw and the conductive rod outside the rotating shaft;

[0028] Figure 4 This is a schematic diagram of the rotor lead screw installed in the shaft;

[0029] Explanation of the marks in the figure: 1- tool head lead screw, 2- lead screw, 3- conductive rod, 4- center line of conductive rod, 5- torque a, 6- position mark A, 7- position mark B, 8- position mark C, 9- position mark D, 10- position mark E, 11- rotor lead, 12- insulating tube, 13- insulating spacer, 14- fixing nut. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the accompanying drawings. The following implementation examples 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.

[0031] This embodiment provides a process for installing rotor lead screws of a large air-cooled generator, which is implemented by the following steps:

[0032] 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 chips 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, 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.

[0033] 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 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 copper chips between the thread of the tool head lead screw 1 and the conductive rod 3, which may affect the actual matching effect between the tool head lead screw 1 and the conductive rod 3.

[0034] 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 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 chips 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.

[0035] S4. 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 chips 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.

[0036] 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 chips 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.

[0037] 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 chips 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] S7. Mark the lead welding position and tightening position of lead screw 2 on the tool head lead screw 1 according to the direction of position mark E10, and process the 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.

[0039] S8. Preparation work for assembly inside the rotating shaft: Assemble the conductive rod 3 inside the rotating shaft, weld the rotor lead 11 to the lead screw 2, and weld the lead screw 2 and the rotor lead 11 outside the rotating shaft to prevent excess solder from flowing into the rotating shaft, damaging the insulation at high temperature, and burying quality risks.

[0040] 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 rotating shaft threaded hole.

[0041] S10. Remove the lead screw 2.

[0042] S11. Reinstall the lead screw 2 and the insulating tube 12, tighten the lead screw 2 with torque a5, and tighten the lead screw 2 again after one hour to prevent the lead screw 2 from loosening.

[0043] 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 to make the lead screw 2 immovable and improve the appearance of the lead screw 2 assembly.

[0044] 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.

[0045] 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 external hexagonal structure, the tool head lead screw 1 can be tightened using a universal torque wrench, and it is also convenient to mark the external hexagonal structure of the tool head lead screw 1 during subsequent machining.

[0046] Furthermore, in S1, the engaging thread between the tool head lead screw 1 and the conductive rod 3 is a tapered pipe thread.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Furthermore, in said 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.

[0053] 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 above it. If there is contact, the insulating tube 12 and the insulating spacer 13 will be damaged, resulting in insufficient discharge distance of the lead screw 2, causing a quality accident.

[0054] Furthermore, in said 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 that the effective thread length of the threaded hole on the rotating 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.

[0055] like Figure 4 As shown, if the effective thread length of the threaded hole on the rotating 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 rotating shaft.

[0056] 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 installing lead screws on a large air-cooled generator rotor, characterized in that: The method is achieved by the following steps: 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), and mark 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 tool head lead screw (1) into the thread of the conductive rod (3), tighten the tool head lead screw (1) with torque a (5), mark A (6) on the outer circle of the tool head lead screw (1) along the center line of the conductive rod (4), and loosen the tool head lead screw (1) with torque a (5); S3. Second test assembly outside the 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 a (5), mark B (7) on the outer circle of the tool head lead screw (1) along the center line of the conductive rod (4), and loosen the tool head lead screw (1) with torque a (5); S4. Third test assembly outside the 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 a (5), mark C (8) on the outer circle of the tool head lead screw (1) along the center line of the conductive rod (4), and loosen the tool head lead screw (1) with torque a (5); S5. Fourth test assembly outside the 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 a (5), mark D (9) on the outer circle of the tool head lead screw (1) along the center line of the conductive rod (4), and loosen the tool head lead screw (1) with torque a (5); S6. Fifth test 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 a (5), mark E (10) on the outer circle of the tool head lead screw (1) along the center line of the conductive rod (4), and loosen the tool head lead screw (1) with torque a (5); S7, marking the lead welding position and the fastening position of the lead screw (2) on the tool head lead screw (1) according to the direction marked by the position mark E (10), and processing the tool head lead screw (1) into the lead screw (2); S8. Preparation for assembly in the rotating shaft: Assemble the conductive rod (3) in the rotating shaft and weld the rotor lead (11) to 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); S11. Reinstall the lead screw (2) and the insulating tube (12), tighten the lead screw (2) using torque a (5), 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. A large air-cooled generator rotor lead screw installation process according to claim 1, characterized in that: In the above S1, the head of the tool head lead screw (1) is an outer hexagonal structure.

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

4. The method for installing rotor lead screws of a large air-cooled generator according to claim 1, characterized in that: In said 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.

5. The method for installing rotor lead screws of a large air-cooled generator according to claim 1, characterized in that: In said S9, when assembling the insulating tube (12) and the insulating spacer (13), 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.

6. The method for installing rotor lead screws of a large air-cooled generator according to claim 1, characterized in that: In said 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.

7. The method for installing rotor lead screws of a large air-cooled generator according to claim 1, characterized in that: In said 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 that the effective thread length of the threaded hole on the rotating shaft is greater than the thread length of the fixing nut (14).

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