Process method for manufacturing and installing large air-cooled generator rotor lead

Abstract

The invention belongs to the field of assembly of turbo-generator rotors, and discloses a process method for manufacturing and installing a large air-cooled generator rotor lead. In combination with an integrated structure of the lead screw and the lead of the rotor of the large-scale air-cooled generator, the process method for manufacturing and installing the lead of the rotor of the large-scale air-cooled generator saves the manufacturing period and cost, improves the installation quality of the lead of the rotor of the large-scale air-cooled generator, and avoids major quality accidents during operation of a unit.

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 manufacturing and installing rotor leads of a large air-cooled generator. Background Art

[0002] The rotor lead wire structure of large air-cooled steam turbine generators usually adopts a structure in which the rotor lead wire and the lead wire screw are integrated. If the rotor lead wire cannot be correctly connected to the lead wire screw and the coil, the lead wire and the coil cannot be welded during the rotor winding assembly, and the DC resistance is unqualified; quality accidents such as lead wire breakage will occur during the operation of the unit.

[0003] In order to improve the installation quality of large air-cooled generator rotor leads, a process method for manufacturing and installing large air-cooled generator rotor leads is proposed in combination with the structure in which the rotor lead screws and leads are integrated. This method can save manufacturing time and cost, improve the manufacturing and installation efficiency of large air-cooled generator rotor leads, and avoid major quality accidents during unit operation, which has great social significance. Summary of the invention

[0004] In view of this, the present invention provides a process method for manufacturing and installing rotor leads of a large air-cooled generator, which is implemented by the following steps:

[0005] S1, copper strip cutting and processing;

[0006] S2. After cleaning the copper strip, perform surface treatment;

[0007] S3, 12 copper strips are sealed and welded on one side to form a lead, the length of the sealing area, the length of the sealing side of the lead and the lead screw, the lead and the lead screw are welded, and the length of the brazing area becomes a lead screw with a lead;

[0008] S4, the threaded part of the lead screw with lead wire is silver plated;

[0009] S5, chamfer leads and clean up;

[0010] S6. Install the lead screw with the lead wire in the lead screw hole of the rotating shaft, and assemble the fastener of the lead screw with the lead wire;

[0011] S7, insulation of the lead screw with lead wire in the lead screw hole of the rotating shaft;

[0012] S8. Use a bending tool to bend the lead wire;

[0013] S9, welding the bottom turn of coil No. 1 to the coil connection block to form a lead bottom turn connection block;

[0014] S10, protect the lead screw hole of the rotating shaft, and weld the lead bottom turn connecting block to the lead on the rotating shaft.

[0015] S11. After cleaning and removing the protection, clean again.

[0016] In the above-mentioned process method for manufacturing and installing the rotor lead wire of a large air-cooled generator: in said S1, when cutting the copper strip, a process margin needs to be left in the width direction.

[0017] In the above-mentioned process method for manufacturing and installing rotor leads of large air-cooled generators: in said S1, when processing the copper strip, it is necessary to use mechanical processing to remove the process margin in the width direction of the copper strip.

[0018] In the above-mentioned process method for manufacturing and installing rotor leads of large air-cooled generators: in said S2, after the copper strip is cleaned, surface treatment is performed by pickling.

[0019] In the above-mentioned process method for manufacturing and installing rotor leads of a large air-cooled generator: in S3, the length of the sealing welding area shall not exceed the length of the brazing area.

[0020] In the above-mentioned process method for manufacturing and installing rotor leads of a large air-cooled generator: in S5, the chamfered area shall not exceed the length of the brazing area.

[0021] In the above-mentioned process method for manufacturing and installing rotor leads of a large air-cooled generator: in S8, the material of the bent tool is an insulating part.

[0022] In the above-mentioned process method for manufacturing and installing the rotor lead wire of a large air-cooled generator: in S9, the welding of the bottom turn of coil No. 1 and the coil connecting block needs to be performed outside the rotating shaft.

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

[0024] The present invention aims at the structure in which the lead screws and the lead wires are integrated into the rotor lead wire of a large air-cooled generator, and deeply analyzes the process method for manufacturing and installing the rotor lead wires of a large air-cooled generator, thereby saving manufacturing time and cost, improving the manufacturing and installation efficiency of the rotor lead wires of a large air-cooled generator, and avoiding major quality accidents during the operation of the unit, which has great social significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of copper sheet cutting and processing;

[0026] Figure 2 This is a schematic diagram of copper sheet welding;

[0027] Figure 3 This is a schematic diagram of welding the lead wire and the lead screw;

[0028] Figure 4 It is a schematic diagram of the lead bending;

[0029] Figure 5 It is a schematic diagram of a lead screw with a lead wire;

[0030] Figure 6 Schematic diagram of the lead bottom turn connection block;

[0031] Markings in the figure: 1-copper tape, 2-lead screw, 3-lead, 4-sealing area length, 5-length distance, 6-brazing area length, 7-lead screw with lead, 8-chamfered area, 9-spindle lead screw hole, 10-fastener, 11-insulation, 12-bending tool, 13-No. 1 coil bottom turn, 14-coil connecting block, 15-lead bottom turn connecting block. DETAILED DESCRIPTION

[0032] 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.

[0033] This embodiment provides a process for manufacturing and installing rotor leads of a large air-cooled generator, and the method is implemented by the following steps:

[0034] S1, cutting and processing the copper strip 1 to obtain the raw material of the lead 3.

[0035] S2. After the copper strip 1 is cleaned, surface treatment is performed to improve the state of the copper strip 1 during welding.

[0036] S3, 12 copper strips 1 are sealed and welded on one side to form lead 3, the sealing area length is 4, the length distance between the sealing side of lead 3 and lead screw 2 is 5, lead 3 is welded to lead screw 2, the brazing area length is 6, to form lead screw 7 with lead.

[0037] S4, the threaded portion of the lead screw 7 with lead wire is silver plated.

[0038] S5. Chamfer the lead wire 3 and clean it to facilitate the smooth installation of the fastener 10 of the lead screw 7 with the lead wire. The welding of the lead screw 2 is carried out outside the shaft to facilitate operation and prevent foreign matter and cooling water used during welding from falling into the lead screw hole 9 of the shaft, affecting product quality.

[0039] S6. Install the lead screw 7 with the lead wire in the lead screw hole 9 of the rotating shaft, and assemble the fastener 10 of the lead screw 7 with the lead wire.

[0040] S7. Wrap the insulation 11 of the lead screw 7 with a lead wire in the lead screw hole 9 of the rotating shaft to prevent the insulation 11 from being too thick, which will cause the fastener 10 of the lead screw 7 with a lead wire to be unable to be installed.

[0041] S8. Use a bending tool 12 to bend the lead 3. The bending should be done piece by piece to ensure the bending quality.

[0042] S9. Weld the bottom turn 13 of coil No. 1 to the coil connecting block 14 to form the lead bottom turn connecting block 15. Welding is performed outside the rotating shaft to prevent foreign matter and cooling water used during welding from falling into the rotating shaft lead screw hole 9, which would affect product quality.

[0043] S10, protecting the lead screw hole 9 of the rotating shaft, welding the lead bottom turn connection block 15 to the lead screw 7 with the lead on the rotating shaft, and using water-soaked absorbent cotton to cool down the rest of the lead.

[0044] S11. After cleaning and removing protection, clean again to ensure product quality.

[0045] Furthermore, in S1, when the copper strip 1 is cut, a process margin needs to be left in the width direction for subsequent processing.

[0046] like Figure 1 As shown, the section line area is a schematic representation of the product's required dimensions, and the dotted line area is the process allowance, which includes the process allowance for machining and the allowance for the shear hardening zone.

[0047] Furthermore, in S1, when the copper strip 1 is processed, a machining method is used to remove the process margin in the width direction of the copper strip 1.

[0048] like Figure 1 As shown, mechanical processing methods such as wire cutting are used to remove the dotted line part of the copper strip 1, and the shear hardened band caused by cutting in the width direction of the copper strip 1 is removed. The width direction is the part that is easy to break during operation of the lead screw 7 with a lead wire. In terms of material, the possibility of breakage of the lead screw 7 with a lead wire is reduced, thereby improving product quality.

[0049] Furthermore, in S2, after the copper strip 1 is cleaned, it is surface treated by pickling.

[0050] After pickling, the surface oxide of the copper strip 1 is removed, thereby improving the contact between the copper strips 1 and the copper strips 1 (such as Figure 3 As shown), the welding quality between the lead screw 2 and the lead 3.

[0051] Furthermore, in S3, the length 4 of the sealing area shall not exceed the length 6 of the brazing area.

[0052] like Figure 2 He Ru Figure 3 If the length of the sealing welding area 4 exceeds the length of the soldering area 6, in the subsequent welding process between the lead screw 2 and the lead 3, the lead 3 will be cracked and the soldering piece will melt, thus affecting the appearance quality.

[0053] Furthermore, in S5, the chamfered area 8 must not exceed the brazing area length 6.

[0054] like Figure 3 As shown, if the chamfered area 8 exceeds the length 6 of the soldering area, the strength of the lead wire 3 will be affected, and cracks may occur at this location during the operation of the unit.

[0055] Furthermore, in the above S8, the bending tool 12 is made of an insulating member.

[0056] like Figure 4 As shown, the bending of the lead wire 3 needs to be performed on the rotating shaft, so the bending tool 12 is made of insulating material to prevent foreign matter from being generated when the lead wire 3 is bent. When in use, the lead wires 3 are first bent into 90° piece by piece, and then the lead wires 3 are bent into a "?" shape. The effect after bending is as follows Figure 5 shown.

[0057] Furthermore, in S9, the welding of the bottom turn 13 of coil No. 1 and the coil connecting block 14 needs to be performed outside the rotating shaft.

[0058] like Figure 6 As shown, the bottom turn 13 of coil No. 1 and the coil connecting block 14 are welded outside the rotating shaft, which is convenient for operation and prevents foreign matter and cooling water used in welding from falling into the rotating shaft lead screw hole 9, affecting product quality.

[0059] 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 process for manufacturing and installing rotor leads of large air-cooled generators, characterized in that: The method is implemented by the following steps: S1, cutting and processing of copper strip (1); S2, after cleaning the copper strip (1), surface treatment is performed; S3, 12 copper strips (1) are sealed and welded on one side to form a lead (3), the length of the sealing area (4), the length distance (5) between the sealing side of the lead (3) and the lead screw (2), the lead (3) and the lead screw (2) are welded, the length of the brazing area (6), and a lead screw (7) with a lead is formed; S4, the threaded part of the lead screw (7) with lead wire is silver plated; S5, chamfering leads (3), cleaning; S6, installing the lead screw (7) with the lead wire in the lead screw hole (9) of the rotating shaft, and assembling the fastener (10) of the lead screw (7) with the lead wire; S7, wrapping the insulation (11) of the lead screw (7) with the lead wire in the lead screw hole (9) of the rotating shaft; S8, using a bending tool (12) to bend the lead wire (3); S9, welding the bottom turn (13) of coil No. 1 to the coil connection block (14) to form a lead bottom turn connection block (15); S10, protecting the lead screw hole (9) of the rotating shaft, and welding the lead bottom turn connection block (15) to the lead (3) on the rotating shaft; S11. After cleaning and removing the protection, clean again.

2. The process for manufacturing and installing rotor leads of a large air-cooled generator according to claim 1 is characterized in that: In the above-mentioned S1, when the copper strip (1) is cut, a process margin needs to be left in the width direction.

3. The process for manufacturing and installing rotor leads of a large air-cooled generator according to claim 1 is characterized in that: In S1, when the copper strip (1) is processed, mechanical processing is required to remove the process margin in the width direction of the copper strip (1).

4. The process for manufacturing and installing rotor leads of a large air-cooled generator according to claim 1 is characterized in that: In S2, after the copper strip (1) is cleaned, it is surface treated by pickling.

5. The process for manufacturing and installing rotor leads of a large air-cooled generator according to claim 1 is characterized in that: In S3, the length of the sealing area (4) shall not exceed the length of the brazing area (6).

6. The process for manufacturing and installing rotor leads of a large air-cooled generator according to claim 1 is characterized in that: In the above S5, the chamfered area (8) must not exceed the brazing area length (6).

7. The process for manufacturing and installing rotor leads of a large air-cooled generator according to claim 1 is characterized in that: In the above-mentioned S8, the material of the bending tool (12) is an insulating member. The process for manufacturing and installing rotor leads of a large air-cooled generator according to claim 1 is characterized in that: In the above-mentioned S9, the welding of the bottom turn (13) of coil No. 1 and the coil connecting block (14) needs to be performed outside the rotating shaft.

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