A steam turbine generator spring assembly extension device

Abstract

The present invention belongs to the field of mechanical design technology, and specifically relates to a steam turbine generator spring assembly extension device. The present invention includes an oil pressure supply device, a high-pressure hose, and an extension mechanism. The oil pressure supply device is connected to one side of the high-pressure hose through a quick connector; the other side of the high-pressure hose is connected to the oil inlet nut in the extension mechanism, and a sealing gasket is installed between the two for sealing. The present invention utilizes the limited space between the spring assembly and the pressure ring to release the elastic performance of the spring, thereby achieving the purpose of being able to inspect the spring assembly in all areas of the generator end.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical design, and in particular relates to a spring assembly jacking device for a steam turbine generator. Background Art

[0002] During the operation of the generator, the interaction between the stator winding current and the end leakage magnetic field will generate a large double frequency vibration force. Therefore, a spring assembly structure is designed at the end of the generator stator to buffer and release the vibration stress between the stator pressure ring, cone ring and other components.

[0003] The generator of a nuclear power plant unit is a TBB-1000-2y3 steam turbine generator produced by a Russian power plant. Due to its inherent design and manufacturing defects, the natural frequency of the elliptical vibration mode at the end of the stator of the two generators was unqualified when they left the factory, and it was always between 107-109Hz. Because the stator has a natural frequency close to the double frequency (100Hz) and the corresponding vibration mode is elliptical, the end winding will resonate or vibrate greatly under the excitation of electromagnetic interference force. The large vibration force caused the unit generator to suffer from spring assembly fasteners falling off, leaf spring wear, compensation wear and other faults.

[0004] To handle the above spring assembly failures, the spring assembly needs to be removed for repair. The traditional disassembly process is to remove the windshield on the back of the spring assembly and use a top screw to extend the leaf spring to release its elastic properties. However, due to structural limitations, the windshield cannot be removed in some areas, and the top screw hole area is inaccessible (Note: During the generator manufacturing stage, some stator components are installed after the spring assembly is installed, and the manufacturer's design does not consider the repair of spring assemblies in some areas during the maintenance stage). Therefore, the use of traditional processes has many restrictions and there is a technical deficiency that cannot repair all spring assemblies. Summary of the invention

[0005] Technical problems solved by the present invention:

[0006] The invention provides a steam turbine generator spring assembly extension device, which utilizes the limited space between the spring assembly and the pressing ring to release the elastic performance of the spring, thereby achieving the purpose of being able to inspect and repair the spring assembly in all areas of the generator end.

[0007] The technical solution adopted by the present invention is:

[0008] A steam turbine generator spring assembly extension device comprises an oil pressure supply device, a high-pressure hose and an extension mechanism. The oil pressure supply device is connected to one side of the high-pressure hose through a quick connector; the other side of the high-pressure hose is connected to the extension mechanism.

[0009] The jacking mechanism comprises an oil inlet nut, an oil storage plate, a bellows I, a bellows II, a jacking flat steel and an oil baffle plate. The oil inlet nut is provided with an oil hole I, and the oil storage plate is provided with an oil hole II. The oil inlet nut is connected to the oil storage plate after the oil hole I and the oil hole II cooperate with each other. A jacking flat steel is provided on the upper part of the oil storage plate, and the oil storage plate is provided with oil holes III and oil holes IV. The bellows I is located in the oil hole III and connected to the jacking flat steel, and the bellows II is located in the oil hole IV and connected to the jacking flat steel.

[0010] The other side of the high-pressure hose is connected to the oil inlet nut in the jacking mechanism, and a sealing gasket is installed between the two for sealing.

[0011] An oil channel is milled at the bottom of the oil storage plate, and the oil baffle plate and the bottom of the oil storage plate are connected by welding, and the three form an oil storage chamber.

[0012] Annular steps are provided inside the oil holes III and IV. One end of the bellows I is welded to the annular step inside the oil hole III, and the other end is connected to the top extending flat steel by welding. One end of the bellows II is welded to the annular step inside the oil hole IV, and the other end is connected to the top extending flat steel by welding.

[0013] Install the oil storage plate, bellows Ⅰ, bellows Ⅱ, jacking flat steel and oil baffle plate in the jacking mechanism into the gap between the pressure ring and the spring assembly. The axial positioning of the installation is that bellows Ⅰ corresponds to jacking screw hole Ⅰ, and bellows Ⅱ corresponds to jacking screw hole Ⅱ.

[0014] The starter oil pressure supply device provides high-pressure oil, which is finally transmitted to bellows I and bellows II through the oil inlet nut, oil storage plate and oil channel. The bellows is lifted up by the high-pressure oil, and together with the jacking flat steel, the spring assembly is stretched straight to release its elastic properties.

[0015] Beneficial effects of the present invention:

[0016] (1) The present invention provides a steam turbine generator spring assembly extension device, which adopts a technical solution of extending the spring assembly using the internal space of the spring assembly, is not limited by the structure space of the generator stator, solves the technical problem that the thread area of ​​some spring assemblies in the traditional process is inaccessible and cannot be disassembled, and achieves the technical effect of comprehensive maintenance of this type of spring assembly;

[0017] (2) The steam turbine generator spring assembly extension device provided by the present invention can effectively prevent the spring assembly failure from expanding, thereby causing the nuclear power generator unit to shut down due to failure, and has obvious technical advantages over the traditional jacking screw extension method;

[0018] (3) The steam turbine generator spring assembly extension device provided by the present invention can ensure the safe and stable operation of the nuclear power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A schematic structural diagram of a steam turbine generator spring assembly extension device provided by the present invention;

[0020] Figure 2 This is the main view of the top extension mechanism;

[0021] Figure 3 It is a top view of the extension mechanism;

[0022] Figure 4 This is a schematic diagram of the installation of the spring assembly extension device;

[0023] In the figure: 1. Oil pressure supply device; 2. High-pressure hose; 3. Extension mechanism; 4. Oil inlet nut; 5. Oil storage plate; 6. Bellows I; 7. Bellows II; 8. Extension flat steel; 9. Oil hole I; 10. Oil hole II; 11. Oil channel; 12. Oil hole III; 13. Oil hole IV; 14. Sealing gasket; 15. Oil baffle plate; 16. Press ring; 17. Spring assembly; 18. Top screw hole I; 19. Top screw hole II. DETAILED DESCRIPTION

[0024] The following is a further detailed description of a steam turbine generator spring assembly extension device provided by the present invention in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figure 1 As shown, a steam turbine generator spring assembly extension device provided by the present invention includes an oil pressure supply device 1, a high-pressure hose 2, and an extension mechanism 3. The oil pressure supply device 1 is connected to one side of the high-pressure hose 2 through a quick connector; the other side of the high-pressure hose 2 is connected to the extension mechanism 3.

[0026] like Figure 2 and Figure 3 As shown, the extension mechanism 3 includes an oil inlet nut 4, an oil storage plate 5, a bellows Ⅰ6, a bellows Ⅱ7, an extension flat steel 8, and an oil baffle plate 15. The oil inlet nut 4 is provided with an oil hole Ⅰ9, and the oil storage plate 5 is provided with an oil hole Ⅱ10. After the oil hole Ⅰ9 and the oil hole Ⅱ10 are matched, the oil inlet nut 4 is connected to the oil storage plate 5 by welding; an oil channel 11 is milled at the bottom of the oil storage plate 5, and the oil baffle plate 15 is connected to the bottom of the oil storage plate 5 by welding, and the three form an oil storage chamber; an extension flat steel 8 is provided on the upper part of the oil storage plate 5, and the oil storage plate 5 is provided with oil holes Ⅲ12 and oil holes Ⅳ13. Annular steps are provided inside the oil holes Ⅲ12 and Ⅳ13. One end of the bellows Ⅰ6 is welded to the annular step inside the oil hole Ⅲ12, and the other end is connected to the extension flat steel 8 by welding. One end of the bellows Ⅱ7 is welded to the annular step inside the oil hole Ⅳ13, and the other end is connected to the extension flat steel 8 by welding.

[0027] The other side of the high-pressure hose 2 is connected to the oil inlet nut 4 in the jacking mechanism 3 through a threaded connection, and a sealing gasket 14 is installed between the two for sealing.

[0028] Combine the following Figure 4The working principle of the spring assembly extension device provided by the present invention is described as follows: the oil storage plate 5, bellows Ⅰ6, bellows Ⅱ7, extension flat steel 8, and oil baffle plate 15 in the extension mechanism 3 are installed in the gap between the pressure ring 16 and the spring assembly 17, and the installation axial positioning is that the bellows Ⅰ6 corresponds to the top thread hole Ⅰ18, and the bellows Ⅱ7 corresponds to the top thread hole Ⅱ19. After the sealing gasket 14 is installed in the oil inlet nut, it is connected to the threaded side of the high-pressure hose 2, and the high-pressure hose 2 is connected to the oil pressure supply device 1 on the quick connector side. The oil pressure supply device 1 is started to provide high-pressure oil, and the high-pressure oil is finally transmitted to the bellows Ⅰ6 and bellows Ⅱ7 through the oil inlet nut 4, the oil storage plate 5, and the oil channel 11. The bellows are lifted up under the action of the high-pressure oil, and together with the extension flat steel 8, the spring assembly 17 is stretched straight to release its elastic properties.

[0029] The contents not described in detail in the specification of the present invention may adopt the existing technology, for example, the oil pressure supply device 1 and the high-pressure hose 2 may adopt the products of the existing technology.

[0030] The present invention is described in detail above with reference to the accompanying drawings and actual operations, but the present invention is not limited to the above operations. Various changes, including changes in size, can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. Any content not described in detail in the present invention can adopt the existing technology.

Claims

1. A steam turbine generator spring assembly extension device, characterized in that: The invention comprises an oil pressure supply device (1), a high-pressure hose (2), and a jacking mechanism (3); the oil pressure supply device (1) is connected to one side of the high-pressure hose (2) via a quick connector; and the other side of the high-pressure hose (2) is connected to the jacking mechanism (3); The jacking mechanism (3) comprises an oil inlet nut (4), an oil storage plate (5), a bellows I (6), a bellows II (7), a jacking flat steel (8), and an oil baffle plate (15). The oil inlet nut (4) is provided with an oil hole I (9), and the oil storage plate (5) is provided with an oil hole II (10). The oil inlet nut (4) and the oil storage plate (5) are connected by the oil hole I (9) and the oil hole II (10). The oil storage plate (5) is provided with a jacking flat steel (8) on its upper part. The oil storage plate (5) is provided with an oil hole III (12) and an oil hole IV (13). The bellows I (6) is located in the oil hole III (12) and is connected to the jacking flat steel (8). The bellows II (7) is located in the oil hole IV (13) and is connected to the jacking flat steel (8). The other side of the high-pressure hose (2) is connected to the oil inlet nut (4) in the jacking mechanism (3), and a sealing gasket (14) is installed between the two for sealing; The bottom of the oil storage plate (5) is milled with an oil passage (11), and the oil baffle plate (15) and the bottom of the oil storage plate (5) are connected by welding, and the three form an oil storage chamber; The oil hole III (12) and the oil hole IV (13) are provided with an annular step inside. One end of the bellows I (6) is welded to the annular step inside the oil hole III (12), and the other end is connected to the top extension flat steel (8) by welding. One end of the bellows II (7) is welded to the annular step inside the oil hole IV (13), and the other end is connected to the top extension flat steel (8) by welding. The oil storage plate (5), bellows I (6), bellows II (7), the extension flat steel (8), and the oil baffle plate (15) in the extension mechanism (3) are installed in the gap between the pressure ring (16) and the spring assembly (17). The axial positioning of the installation is such that the bellows I (6) corresponds to the top screw hole I (18), and the bellows II (7) corresponds to the top screw hole II (19).

2. A steam turbine generator spring assembly extension device according to claim 1, characterized in that: The oil pressure supply device (1) is started to provide high-pressure oil. The high-pressure oil is finally transmitted to the bellows I (6) and bellows II (7) through the oil inlet nut (4), the oil storage plate (5) and the oil channel (11). The bellows are lifted up under the action of the high-pressure oil and together with the extension flat steel (8), the spring assembly (17) is stretched straight to release its elastic properties.

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