Generator rotor groove bottom filler strip anti-escape device
By adding baffles to the bottom of the rotor slots and fixing the slot bottom pads by bonding and welding, the problem of slot bottom pad escape was solved, improving the operational reliability of the generator and the long-term stability of the equipment.
Patent Information
- Application Number
- CN202520323792.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2035-02-26
AI Technical Summary
The bottom pads of the generator rotor slots are prone to falling off and escaping, leading to component wear and foreign object risks, which affects the reliability of equipment operation.
A stop block is added to the bottom of the rotor slot, and the slot bottom pad is fixed by bonding and welding to prevent it from escaping.
It effectively prevents the bottom pad strip from escaping, improves the long-term operational reliability of the equipment, and reduces component wear and foreign object contamination.
Smart Images
Figure CN223816041U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of industrial production technology, specifically to a generator rotor slot bottom pad anti-escape device. Background Technology
[0002] The slot bottom pads of the generator rotor introduced by Siemens may escape from the air vent during operation. This will affect the rotor's mass distribution to some extent and create the risk of foreign objects inside the machine. More seriously, the larger space in the slots of the coils will cause increased wear of components during turning and lead to metallic dust pollution.
[0003] like Figure 1 The reason for the slippage of the slot bottom pad in the rotor slot structure shown is that the rotor of the water-hydrogen cooled generator, which is based on Siemens technology, has a loose slot wedge structure. During operation, the coil is tightly attached to the slot wedge, and the slot bottom pad has no radial clamping force, only its own centrifugal force. The centrifugal force of the slot bottom pad generates an axial component in the horizontal direction. If only rotor deflection is considered, the slot bottom pad may move towards the steam end. If the pad under the wedge is also considered to be fitted according to the lowest point of the copper wire, and the lowest point in the slot is near the slot opening, the slot bottom pad is prone to generating force in the slot opening direction. The slot bottom pads at both ends of the steam excitation may move. At the same time, due to the loose slot wedge structure, the gap between the slot bottom pad and the slot bottom is large during operation. One end of the slot bottom pad is unrestrained. When the rotor rotates, under the action of the unbalanced force in the horizontal direction, the slot bottom pad will be more likely to slide out, and the further it slides, the further it will go. Utility Model Content
[0004] The technical problem this invention aims to solve is that the existing generator rotor slot bottom pads are prone to falling off and escaping, leading to component damage.
[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is to provide a generator rotor slot bottom pad anti-escape device, including a rotating shaft and multiple rotor slots. The rotor slots are evenly arranged on the rotating shaft. A rotor winding is provided in the rotor slot. A rotor coil is provided between the rotor slots. A slot bottom pad is provided at the bottom of the rotor slot. A stop block is provided at the slot opening of the straight part of the rotor slot. The stop block is located outside the slot bottom pad and is connected to the rotor coil.
[0006] Optionally, the groove bottom pad is bonded to the bottom of the rotor groove.
[0007] Optionally, the stop block is made of copper plate and is welded to both ends of the rotor coil.
[0008] In summary, this utility model adds a stop block to the bottom of the rotor slot and fixes the slot bottom pad strip by adhesive bonding to prevent the slot bottom pad strip from escaping, thereby ensuring the normal operation of the unit and improving the long-term reliability of the equipment. Attached Figure Description
[0009] Figure 1 Figure is a schematic diagram of the rotor slot structure in the prior art;
[0010] Figure 2 Figure is a schematic diagram of the structure and rotor slot bottom amplification structure of the utility model;
[0011] In the figure: 1, rotating shaft; 2, rotor winding; 3, slot bottom pad strip; 4, stop block; 5, rotor slot; 6, rotor coil. DETAILED DESCRIPTION
[0012] The following will be combined Figures 1-2 The utility model is further explained in detail.
[0013] The utility model discloses a generator rotor slot bottom pad strip anti-escape device, refer to Figure 2 , including rotating shaft 1 and multiple rotor slots 5, rotor slots 5 are evenly arranged on rotating shaft 1, rotor winding 2 is arranged in rotor slot 5, rotor coil 6 is arranged between rotor slots 5, slot bottom pad strip 3 is arranged at the slot bottom of rotor slot 5, slot bottom pad strip 3 is bonded with the slot bottom of rotor slot 5, stop block 4 is arranged at the linear part slot of rotor slot 5, stop block 4 is located at the outside of slot bottom pad strip 3, and stop block 4 is made of red copper plate and is welded with the both ends of rotor coil 6.
[0014] The utility model is bonded with the slot bottom by using adhesive when installing, prevents slot bottom pad strip 3 from moving to both sides, after rechecking that there is no foreign matter in the slot, slot bottom pad strip 3 is put into the slot bottom, the both ends of slot bottom pad strip 3 are even in the size of slot opening, the one side covered with nomex paper is upwards, the bottom surface is coated with JX-9, and is bonded with the bottom surface of rotor slot 5, which can keep slot bottom pad strip 3 from moving for a long time.
[0015] The linear part slot of rotor slot 5 is increased with stop block 4, and the both ends of rotor coil 6 are welded and fixed, even if arranging material in rotor slot 5 according to the limit size and compacting, slot bottom pad strip 3 cannot escape from stop block 4, the height of stop block is set as 10mm, the material is selected as red copper plate, and the both ends of rotor coil 6 are welded and fixed at the slot opening position, silver welding rod or silver welding wire is used for welding, and the welding seam around is polished and cleaned by angle grinder after welding, which can ensure that slot bottom pad strip 3 cannot escape from the linear part of rotor slot 5.
[0016] If the in-service Siemens technology water hydrogen cooling unit needs to be optimized, the generator rotor needs to be returned to the manufacturing plant, the rotor needs to be disassembled, all coils need to be removed and cleaned, the remaining new stop blocks 4 need to be welded, and in the process of re-embedding the wire, the two technical measures are applied in the above-mentioned manner.
[0017] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.
Claims
1. An electric generator rotor slot bottom wedge anti-escape device characterized by, The application relates to a rotor slot structure, which comprises a rotating shaft (1) and a plurality of rotor slots (5) uniformly arranged on the rotating shaft (1), a rotor winding (2) arranged in the rotor slot (5), a rotor coil (6) arranged between the rotor slots (5), a slot bottom pad (3) arranged at the bottom of the rotor slot (5), and a stop block (4) arranged at the slot opening of the straight part of the rotor slot (5), wherein the stop block (4) is arranged outside the slot bottom pad (3) and connected with the rotor coil (6).
2. The generator rotor slot bottom bar escape prevention device of claim 1, wherein, The slot bottom pad (3) is bonded with the bottom of the rotor slot (5).
3. The generator rotor bar-slot mat escape-prevention device of claim 1, wherein, The stop block (4) is made of red copper plate and welded with the two ends of the rotor coil (6).