Turbine generator cone ring back balancing weight frequency modulation structure

Abstract

The utility model relates to the field of steam turbine generators, in particular to a cone ring back balancing weight frequency modulation structure of a steam turbine generator. According to the arrangement of the balancing weight in the back space of the whole conical ring, the position where the space is too small and does not meet the arrangement requirement of the balancing weight is adopted, a balancing weight strip penetrates into an unoccupied wire hole of the lead support, a gap between the balancing weight strip and the lead support is filled with impregnated polyester felt, and the balancing weight strip and the lead support are bound and fixed through a glass tape. The weight of the balancing weight is large, the weight of the end portion of the stator winding can be remarkably increased, the inherent frequency of the end portion of the stator winding is reduced, the weight of the balancing weight strip is small, the balancing weight strip can adapt to the position where the space is too small and does not meet the arrangement requirement of the balancing weight, space is saved, and the inherent frequency of the end portion of the stator winding can be finely adjusted.

Description

Technical Field

[0001] The utility model relates to the field of steam turbine generators, in particular to a frequency modulation structure of a counterweight block on the back of a cone ring of a steam turbine generator. Background Art

[0002] At present, the frequency of the stator winding ends of domestic steam turbine generators is mainly modulated by increasing the stiffness. With the development of steam turbine generator technology, the integral glue-filled structure of the stator winding ends of steam turbine generators has become the mainstream, which has the advantages of good stiffness and small amplitude. However, it is not suitable to adjust the natural frequency by changing the stiffness of the stator winding ends. When the natural frequency of the stator winding ends of the integral glue-filled structure does not meet the design requirements, it will be impossible to adjust. There is an urgent need for a frequency modulation structure that does not adjust the natural frequency by changing the stiffness of the stator winding ends. The frequency modulation structure of the counterweight block on the back of the cone ring of the steam turbine generator can meet the above needs. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to disclose a frequency modulation structure of a counterweight block on the back of a turbine generator cone ring, which functions to reduce the natural frequency by increasing the weight. When the natural frequency of the stator winding end of the integral glue-filled structure does not meet the design requirements, the natural frequency is reduced by installing a counterweight block on the back of the stator winding cone ring, or by installing a counterweight bar in the lead bracket. The technical solution of this utility model is: it consists of a counterweight block, a counterweight bar, an impregnated polyester felt, a glass ribbon, an integral cone ring and a lead bracket; according to the arrangement of the counterweight block in the space on the back of the integral cone ring, if the space is too small to meet the requirements for the arrangement of the counterweight block, a counterweight bar is inserted into the empty wire hole of the lead bracket, and the gap between the counterweight bar and the lead bracket is filled with impregnated polyester felt, and fixed by binding with a glass ribbon. The counterweight block is composed of a counterweight plate, stud bolts, a pressure plate, a butterfly washer, a stop washer and a nut. Select an appropriate number of counterweight plates, pass the stud bolts through the counterweight plates and fit them to the back of the integral cone ring, install a pressure plate at the other end of the stud bolts to press the counterweight plate, arrange a butterfly washer, a stop washer and a nut in the countersunk hole of the pressure plate, and lock the nut with the stop washer after tightening.

[0004] Compared with the prior art, the beneficial effects of the present invention are:

[0005] 1. The counterweight block in the present invention can select a suitable counterweight plate according to needs. The counterweight plate has a large mass and can significantly increase the weight of the stator winding end and reduce the natural frequency of the stator winding end.

[0006] 2. The counterweight bar in the present invention can adapt to a position where the space is too small to meet the requirements for arranging the counterweight block, saving space. Due to its relatively small mass, the natural frequency of the stator winding end can be fine-tuned. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is the detailed drawing of the frequency modulation structure of the counterweight block on the back of the turbine generator cone ring;

[0008] Figure 2 This is a detailed cross-sectional view of the counterweight block of the frequency modulation structure of the back of the cone ring of the steam turbine generator;

[0009] Figure 3 This is a detailed cross-sectional view of the counterweight bar of the frequency modulation structure of the back counterweight block of the turbine generator cone ring;

[0010] Figure 4 This is the steam end detail of the frequency modulation structure of the counterweight block on the back of the conical ring of the steam turbine generator;

[0011] Description of component numbers in the accompanying drawings:

[0012] 1-Counterweight block; 2-Counterweight bar; 3-Impregnated polyester felt; 4-Glass ribbon; 5-Integral cone ring; 6-Lead bracket; 7-Counterweight plate; 8-Stud bolt; 9-Pressure plate; 10-Butterfly washer; 11-Locking washer; 12-Nut. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] like Figure 1 Figure 3 Figure 4 As shown, the frequency modulation structure of the counterweight block on the back of the cone ring of the steam turbine generator comprises a counterweight block 1, a counterweight bar 2, an impregnated polyester felt 3, a glass ribbon 4, an integral cone ring 5 and a lead bracket 6; according to the arrangement of the counterweight block 1 in the space on the back of the integral cone ring 5, where the space is too small to meet the arrangement requirements of the counterweight block 1, the counterweight bar 2 is passed through the empty wire hole of the lead bracket 6, and the impregnated polyester felt 3 is used to fill the gap between the counterweight bar 2 and the lead bracket 6, and they are tied and fixed by the glass ribbon 4.

[0015] like Figure 2 As shown, the counterweight block 1 is composed of a counterweight plate 7, a stud bolt 8, a pressure plate 9, a butterfly washer 10, a stop washer 11 and a nut 12. Select a suitable number of counterweight plates 7, pass the stud bolts 8 through the counterweight plates 7 and fit them to the back of the integral cone ring 5. Install the pressure plate 9 at the other end of the stud bolt 8 to press the counterweight plate 7. Arrange the butterfly washer 10, the stop washer 11 and the nut 12 in the countersunk hole of the pressure plate 9. After the nut 12 is tightened, it is locked by the stop washer 11.

[0016] Although the basic principles and main features of the present invention have been described above in conjunction with the accompanying drawings, those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the scope of protection of the present invention.

Claims

1. A frequency modulation structure of a counterweight block on the back of a conical ring of a steam turbine generator, characterized in that: The invention is composed of a counterweight block (1), a counterweight bar (2), an impregnated polyester felt (3), a glass ribbon (4), an integral cone ring (5) and a lead bracket (6); the counterweight bar (2) is inserted into the free wire hole of the lead bracket (6), the impregnated polyester felt (3) fills the gap between the counterweight bar (2) and the lead bracket (6), and is tied and fixed by the glass ribbon (4).

2. A turbine generator cone ring back counterweight frequency modulation structure according to claim 1, characterized in that: The counterweight block (1) is composed of a counterweight plate (7), a stud bolt (8), a pressure plate (9), a butterfly washer (10), a stop washer (11) and a nut (12). An appropriate number of counterweight plates (7) are selected, and the stud bolts (8) are passed through the counterweight plates (7) to fix them to the back of the integral cone ring (5). A pressure plate (9) is installed at the other end of the stud bolt (8) to press the counterweight plate (7). A butterfly washer (10), a stop washer (11) and a nut (12) are arranged in the countersunk hole of the pressure plate (9). After the nut (12) is tightened, it is locked by the stop washer (11).

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