Vibration isolation type steam turbine generator unit foundation, damping method and steam turbine generator unit

Abstract

The invention belongs to the technical field of steam turbine generator unit foundations, and provides a vibration isolation type steam turbine generator unit foundation, a damping method and a steam turbine generator unit. A vibration isolator is arranged between each connecting column and a foundation platform and comprises a first panel connected with the foundation platform and a second panel connected with the connecting column; the multi-direction vibration isolation device comprises a first panel, a second panel, a spring arranged between the first panel and the second panel, and a multi-layer plate type eddy current damper arranged between the first panel and the second panel, and through combination of spring vibration isolation and the multi-layer plate type eddy current damper, the multi-direction vibration isolation requirements in the vertical direction and the horizontal direction can be met at the same time; the overall vibration isolation performance can be remarkably improved, the control requirement for complex vibration with random size and various directions under the multiple connecting columns is met, the more stable and efficient vibration isolation effect is provided for operation of the steam turbine generator unit, fatigue damage to parts in the steam turbine generator unit is avoided, and the electric efficiency and safety are guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam turbine generator set foundations, and in particular relates to a vibration isolation type steam turbine generator set foundation, a vibration reduction method and a steam turbine generator set. Background Art

[0002] Steam turbine generator sets are the core equipment in thermal power plants. The vibrations generated during their operation are mainly caused by the unbalanced forces of the rotating parts inside the equipment, the dynamic excitation of the system, and possible structural resonance. These vibrations will trigger the vibration response of the equipment foundation, which will lead to a decrease in equipment operating efficiency, shortened service life, and even potential safety hazards. Excessive vibration not only affects the stable operation of the generator set, but may also have an adverse effect on the surrounding building structures and ancillary equipment, increase maintenance costs and further shorten the service life of the equipment. In addition, long-term vibration may cause fatigue damage to the internal components of the unit, seriously affecting the power generation efficiency and safety.

[0003] At present, the vibration isolators on the foundation of steam turbine generator sets can only meet the damping requirements of vibrations in a single vertical direction. However, the vibrations generated during the operation of the steam turbine generator sets are random in size and diverse in direction, and multiple connecting columns are set on the foundation platform. As a result, the vibration isolators on the foundation of steam turbine generator sets cannot meet the damping requirements, especially the multi-directional vibration isolation requirements between multiple connecting columns and the platform foundation, resulting in fatigue damage to the internal components of the generator set, seriously affecting the power generation efficiency and safety. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a vibration isolation type steam turbine generator set foundation, a shock absorption method and a steam turbine generator set. The vibration isolator includes a first panel connected to the foundation platform, a second panel connected to the connecting column, a spring arranged between the first panel and the second panel, and a multi-layer plate type eddy current damper arranged between the first panel and the second panel. By combining the spring vibration isolation with the multi-layer plate type eddy current damper, the multi-directional vibration isolation requirements in the vertical and horizontal directions can be met at the same time, the overall vibration isolation performance can be significantly improved, and the complex vibration control requirements with random sizes and diverse directions under multiple connecting columns can be met, providing a more stable and efficient vibration isolation effect for the operation of the steam turbine generator set, avoiding fatigue damage to the internal components of the generator set, and ensuring the power generation efficiency and safety.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a vibration isolation type steam turbine generator set foundation, which adopts the following technical solution:

[0006] A vibration isolation type steam turbine generator set foundation comprises a foundation platform, a plurality of connecting columns arranged on the foundation platform, and a plurality of vibration isolators arranged between the foundation platform and the plurality of connecting columns;

[0007] The vibration isolator includes a first panel connected to the base platform, a second panel connected to the connecting column, a spring arranged between the first panel and the second panel, and a multi-layer plate-type eddy current damper arranged between the first panel and the second panel.

[0008] Furthermore, a plurality of cylindrical bosses are provided on the first panel and the second panel; one end of the spring is sleeved on the cylindrical boss of the first panel, and the other end is sleeved on the cylindrical boss of the second panel; a positioning hole is provided inside the cylindrical boss, and the first panel and the second panel are connected by stud bolts.

[0009] Furthermore, the multi-layer plate type eddy current damper includes multiple magnetic steel plates, a cover plate, multiple permanent magnets, multiple conductive copper plates, multiple fixed blocks and connecting parts; the multiple magnetic steel plates are arranged at intervals perpendicular to the predetermined direction; permanent magnets are arranged on both sides of each magnetic steel plate; one end of the conductive copper plate is connected to the fixed block, and the fixed block is connected to the connecting part; the other end of the conductive copper plate extends along the predetermined direction and is inserted in the gap between two adjacent permanent magnets.

[0010] Furthermore, on the basic platform, the conductor copper plates in the vibration isolators on adjacent connecting columns are perpendicular to each other.

[0011] Furthermore, the cover plate is provided with a plurality of rectangular holes, and a plurality of conductor copper plates are inserted into the gap between two adjacent permanent magnets after passing through the rectangular holes.

[0012] Furthermore, a plurality of permanent magnets are arranged on the magnetic steel plate, and the plurality of permanent magnets located on the same side of the magnetic steel plate are arranged at intervals along a predetermined direction; two rows of permanent magnets with opposite magnetic pole directions are arranged on the same side of the magnetic steel plate along the movement direction of the conductor copper plate.

[0013] Furthermore, the magnetic pole directions of the permanent magnets symmetrically arranged on two adjacent magnetic conductive steel plates are the same.

[0014] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also provides a vibration isolation type steam turbine generator set foundation vibration reduction method, which adopts the following technical scheme:

[0015] A vibration isolation method for a steam turbine generator set foundation uses the vibration isolation method for a steam turbine generator set foundation as described in the first aspect, including: using spring vibration isolation and multi-layer plate eddy current dampers to isolate vibrations in the vertical and horizontal directions respectively.

[0016] Furthermore, when the conductor copper plate moves in the air gap between the symmetrical permanent magnets on adjacent magnetic steel plates in a direction perpendicular to the magnetic flux lines, eddy currents are generated in the conductor copper plate. The eddy current field interacts with the magnetic field, and the generated Lorentz force will hinder the relative movement between the conductor copper plate and the magnetic field. At the same time, the eddy currents are converted into heat energy and dissipated due to the resistance in the conductor copper plate, producing a damping effect. When the conductor copper plate is connected to the vibrating structure, eddy currents are continuously generated on the conductor copper plate, and kinetic energy is continuously converted into heat energy in the conductor copper plate, causing the vibration to gradually decay.

[0017] In order to achieve the above-mentioned purpose, in a third aspect, the present invention further provides a steam turbine generator set, which adopts the following technical solution:

[0018] A steam turbine generator set comprises the vibration isolation type steam turbine generator set foundation as described in the first aspect.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, a vibration isolator is arranged between each connecting column and the base platform, wherein the vibration isolator includes a first panel connected to the base platform, a second panel connected to the connecting column, a spring arranged between the first panel and the second panel, and a multi-layer plate-type eddy current damper arranged between the first panel and the second panel. By combining the spring vibration isolation with the multi-layer plate-type eddy current damper, the multi-directional vibration isolation requirements in the vertical direction and the horizontal direction can be met at the same time, the overall vibration isolation performance can be significantly improved, and the complex vibration control requirements with random sizes and various directions under multiple connecting columns can be met, providing a more stable and efficient vibration isolation effect for the operation of the steam turbine generator set, avoiding fatigue damage to the internal components of the generator set, and ensuring the power generation efficiency and safety.

[0021] 2. In the present invention, on the basic platform, the conductor copper plates in the vibration isolators on adjacent connecting columns are perpendicular to each other. The vibration isolation effect in the horizontal direction is improved by staggered layout of multiple connecting isolators. Combined with the spring, it can damp vibrations in different directions in space, further improving the vibration isolation effect, as well as the power generation efficiency and safety.

[0022] 3. The spring isolator with built-in eddy current damping in the present invention combines the spring isolator with eddy current damping, which can not only significantly improve the overall performance of the vibration isolation system, but also provide a more stable and efficient vibration isolation effect under more complex structural vibration control requirements; the multi-layer plate eddy current damper has the advantages of no contact, low wear, simple operating principle, easy installation and maintenance, and good durability, avoiding the problems of seal aging, oil leakage, etc. that are common in traditional viscous dampers.

[0023] 4. The conductor copper plate of the multi-layer plate eddy current damper in the present invention can move in the vertical and horizontal directions in the magnetic field to consume energy, thereby effectively controlling the vertical and horizontal vibrations of the structure, which is in line with the design concept of dual vibration control; the permanent magnets installed on the multi-layer plate eddy current damper are arranged by optimizing the magnetic circuit design, which significantly increases the energy consumption capacity of the multi-layer plate eddy current damper in a limited installation space.

[0024] 5. By adjusting the number, size and performance level of permanent magnets installed on the multi-layer plate eddy current damper described in the present invention, the eddy current damping size can be conveniently adjusted to meet the vibration control requirements of different structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0026] Figure 1 is a cross-sectional view of a vibration isolator according to embodiment 1 of the present invention;

[0027] Figure 2 For example, the embodiment 1 of the present invention is Figure 1 a cross-sectional view at another location;

[0028] Figure 3 It is an isometric view of the vibration isolator of Example 1 of the present invention;

[0029] Figure 4 Schematic diagram of a multi-layer plate type eddy current damper according to Embodiment 1 of the present invention;

[0030] Figure 5 The steam turbine generator foundation of embodiment 1 of the present invention;

[0031] Among them, 1. first panel; 2. second panel; 3. spring; 4. multi-layer plate eddy current damper; 5. magnetic steel plate; 6. cover plate; 7. permanent magnet; 8. conductor copper plate; 9. fixing block; 10. connecting piece; 11. connecting column; 12. basic platform. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0034] Embodiment 1:

[0035] In order to ensure the normal operation of the generator set, the vibration reduction and isolation design of the steam turbine generator set foundation is particularly critical. By adopting reasonable vibration reduction and isolation technology and devices, the vibration amplitude can be effectively reduced, the equipment and surrounding building structures can be protected, the maintenance cost can be reduced, and the reliability and service life of the unit can be improved. At present, spring isolators have been widely used in the foundation vibration reduction and isolation design of steam turbine generator sets due to their excellent elastic properties and strong bearing capacity. However, with the development of modern engineering technology, the solution of vibration reduction and isolation relying solely on mechanical springs can no longer meet the requirements of safety and stability of structural vibration control. In addition, with the proposal and development of the concept of dual vibration control, it is required to consider not only the comfort requirements of the structure under vertical vibration, but also the safety and stability of seismic action (horizontal vibration).

[0036] As described in the background technology, the vibration isolators on the foundation of the steam turbine generator set can only meet the damping requirements of vibrations in a single vertical or vertical direction. However, the vibrations generated during the operation of the steam turbine generator set are random in size and diverse in direction, and multiple connecting columns are arranged on the foundation platform. As a result, the vibration isolators on the foundation of the steam turbine generator set cannot meet the damping requirements, especially the multi-directional vibration isolation requirements between the multiple connecting columns and the platform, resulting in fatigue damage to the internal components of the generator set, seriously affecting the power generation efficiency and safety.

[0037] Traditional viscous dampers generally have problems such as seal aging and oil leakage, which affect their long-term reliability and safety; and can only control the vibration of the structure in a single direction (vertical vibration), and cannot effectively control the vertical and horizontal vibrations of the structure at the same time. It can be seen that the existing spring vibration isolators with built-in viscous damping can no longer meet the growing requirements of engineering technologies such as steam turbine generator sets.

[0038] In order to solve at least one of the above problems, Figure 1 and Figure 5 As shown, this embodiment provides a vibration isolation type steam turbine generator set foundation, which respectively utilizes springs and eddy current dampers to achieve good vibration isolation effect and stable and reliable vibration energy dissipation capacity, thereby effectively suppressing the transmission of vibration caused by the operation of the steam turbine generator set to the foundation; the use of multi-layer plate eddy current dampers avoids the common problems of seal aging, oil leakage, etc. of traditional viscous dampers; the permanent magnets installed on the multi-layer plate eddy current dampers are arranged by magnetic circuit optimization design, which significantly increases the eddy current damping of the multi-layer plate eddy current dampers; by adjusting the number of groups, size and performance level of permanent magnets installed on the built-in multi-layer plate eddy current dampers, the size of eddy current damping can be conveniently adjusted. The foundation includes a foundation platform 12, a plurality of connecting columns 11 arranged on the foundation platform 12, and a plurality of vibration isolators arranged between the foundation platform 12 and the plurality of connecting columns 11;

[0039] The vibration isolator includes a first panel 1 connected to the base platform 12, a second panel 2 connected to the connecting column 11, a spring 3 arranged between the first panel 1 and the second panel 2, and a multi-layer plate-type eddy current damper 4 arranged between the first panel 1 and the second panel 2; the spring 3 can be a steel spring.

[0040] Optionally, the vibration isolator includes a first panel 1, a second panel 2, a spring 3 and a multi-layer plate eddy current damper 4. The spring 3 is arranged between the first panel 1 and the second panel 2, and a plurality of cylindrical bosses are arranged on the first panel 1 and the second panel 2; one end of the spring 3 is sleeved on the cylindrical boss of the first panel 1, and the other end of the spring 3 is sleeved on the cylindrical boss of the second panel 2. A positioning hole is arranged inside the cylindrical boss, and the first panel 1 and the second panel 2 are connected by stud bolts, so as to apply a certain pre-tightening force to the spring 3. Optionally, 4 springs 3 are arranged, and 4 stud bolts are arranged. Of course, the number of springs 3 or stud bolts is not limited to 4 or 4, and can be determined according to actual needs.

[0041] The two ends of the multi-layer plate type eddy current damper 4 are respectively connected to the bottom of the first panel 1 and the top of the second panel 2. The multi-layer plate type eddy current damper 4 includes a plurality of magnetic steel plates 5, a cover plate 6, a plurality of permanent magnets 7, a plurality of conductor copper plates 8, a plurality of fixing blocks 9 and a connector 10. The plurality of magnetic steel plates 5 are arranged at intervals perpendicular to a predetermined direction to form a plurality of gaps extending along a predetermined direction; permanent magnets 7 are arranged on both sides of each magnetic steel plate 5. One end of the conductor copper plate 8 is connected to the fixing block 9, and the fixing block 9 is connected to the connector 10; the other end of the conductor copper plate 8 extends along a predetermined direction and is inserted into the gap between two adjacent permanent magnets 7.

[0042] On the basic platform 12, the conductor copper plates 8 in the vibration isolators on adjacent connecting columns are perpendicular to each other. The vibration isolation effect in the horizontal direction is improved by staggered layout of the vibration isolators on multiple connections 11. Combined with the springs, vibrations in different directions can be damped in the space, further improving the vibration isolation effect, as well as the power generation efficiency and safety.

[0043] Optionally, the bottom of the first panel 1 is provided with a concave platform with internal tapping, the upper end of the connector 10 is cylindrical and has threads on the outside, so that the upper end of the connector 10 of the multi-layer plate-type eddy current damper 4 is connected to the bottom of the first panel 1; the lower end of the connector 10 is a rectangular parallelepiped and has a through hole inside. The bottom of the second panel 2 is provided with a boss capable of fixing the multi-layer plate-type eddy current damper 4.

[0044] The plurality of fixing blocks 9 are all provided with through holes, the first ends of the plurality of conductor copper plates 8 are all provided with through holes matching the plurality of fixing blocks 9 and the connector 10, and the plurality of conductor copper plates 8, the plurality of fixing blocks 9, and the connector 10 are connected as a whole by bolts, so that the connector 10 drives the plurality of fixing blocks 9 and the plurality of conductor copper plates 8 to perform synchronous linear motion along a predetermined direction. Of course, the connection relationship between the conductor copper plates 8, the fixing blocks 9 and the connector 10 is not limited to a bolt connection relationship, and can also be riveted or other connection methods, as long as the overall synchronous linear motion can be achieved. The cover plate 6 is provided with a plurality of rectangular holes, and the plurality of rectangular holes correspond one-to-one to the positions of the plurality of gaps at the positions of the cover plate 6 and are interconnected, and the second ends of the plurality of conductor copper plates 8 are inserted into the gaps through the rectangular holes.

[0045] Among the multiple magnetic conductive steel plates 5, two magnetic conductive steel plates 5 close to the side wall of the multilayer plate type eddy current damper 4 are arranged on the side wall of the multilayer plate type eddy current damper 4 in a one-to-one correspondence, and the remaining magnetic conductive steel plates 5 are arranged to be detachably connected with the multilayer plate type eddy current damper 4. The two magnetic conductive steel plates 5 close to the side wall of the multilayer plate type eddy current damper 4 can be provided with permanent magnets 7 only on the side away from the side wall. When the multilayer plate type eddy current damper 4 is processed and manufactured, the material used for the side wall of the multilayer plate type eddy current damper 4 is consistent with the material used for the magnetic conductive steel plates 5, so that the side wall of the multilayer plate type eddy current damper 4 is set as a non-detachable magnetic conductive steel plate 5. Of course, the two magnetic conductive steel plates 5 can also be fixed to the side wall of the multilayer plate type eddy current damper 4 by welding. The cover plate 6 and the bottom plate of the multi-layer plate type eddy current damper 4 are both provided with a plurality of grooves, one end of the remaining magnetic steel plates 5 are inserted into the grooves of the first panel one by one, and the other ends of the remaining magnetic steel plates 5 are inserted into the grooves of the second panel one by one, thereby realizing a detachable connection between the remaining magnetic steel plates 5 and the multi-layer plate type eddy current damper 4.

[0046] like Figure 4 As shown, the magnetic steel plate 5 is provided with a plurality of permanent magnets 7, and the plurality of permanent magnets 7 on the same side of the magnetic steel plate 5 are arranged at intervals along a predetermined direction; two rows of permanent magnets 7 with opposite magnetic pole directions are arranged along the moving direction of the conductor copper plate 8 on the same side of the magnetic steel plate 5; the magnetic pole directions of the permanent magnets 7 symmetrically arranged on two adjacent magnetic steel plates 5 are the same. The magnetic steel plate 5 is provided with a tapped hole, and the permanent magnet 7 is provided with a center hole. The magnetic steel plate 5 and the permanent magnet 7 are connected by bolts to fix the magnetic steel plate 5 and the permanent magnet 7. Of course, the connection method between the magnetic steel plate 5 and the permanent magnet 7 is not limited to bolt connection, and the permanent magnet 7 can also be embedded in the surface of the magnetic steel plate 5.

[0047] like Figure 4As shown, the magnetic pole directions of the two rows of permanent magnets 7 located on the same side of the magnetic conductive steel plate 5 are opposite. For example, when the left side of the first row of permanent magnets 7 of the same magnetic conductive steel plate 5 is an N pole and the right side is an S pole, the corresponding left side of the second row of permanent magnets 7 is an S pole and the right side is an N pole. The magnetic pole directions of the permanent magnets 7 symmetrically arranged on two adjacent magnetic conductive steel plates 5 are the same. For example, for the permanent magnets 7 symmetrically arranged on two adjacent magnetic conductive steel plates 5, when the left side of a permanent magnet 7 on a certain magnetic conductive steel plate 5 is an N pole and the right side is an S pole, the permanent magnets 7 symmetrically arranged on the adjacent magnetic conductive steel plate 5 also have an N pole on the left side and an S pole on the right side.

[0048] For the multilayer plate type eddy current damper 4, through the above-mentioned magnetic pole arrangement mode, the magnetic pole directions of the adjacent permanent magnets 7 that are in the same direction as the moving direction of the conductor copper plate 8 (i.e., the predetermined direction) are opposite, and the magnetic pole directions of the adjacent permanent magnets 7 that are perpendicular to the moving direction of the conductor copper plate 8 (i.e., the predetermined direction) are the same, thereby completing the magnetic circuit optimization design of the permanent magnets 7, achieving a significant increase in the eddy current damping coefficient of the multilayer plate type eddy current damper 4, and meeting the large damping requirements of structural vibration control; at the same time, the performance of the permanent magnets 7 is fully utilized, and the installation space utilization rate of the permanent magnets 7 inside the multilayer plate type eddy current damper 4 is increased. The two permanent magnets 7 symmetrically arranged on the adjacent two magnetic conductive steel plates 5 are a group, and the eddy current damping coefficient of the multilayer plate type eddy current damper 4 can be conveniently adjusted by adjusting the number of groups of the permanent magnets 7. It should also be noted that the energy dissipation capacity of the multi-layer plate eddy current damper 4 depends not only on the arrangement of the magnetic poles of the permanent magnets, but also on the number, size and performance level of the permanent magnets installed thereon. By changing the number, size and performance level of the permanent magnets, the damping coefficient of the multi-layer plate eddy current damper 4 can be further flexibly adjusted to meet different application scenarios. Figure 1 to Figure 4 It can be seen that, optionally, the multi-layer plate-type eddy current damper 4 is composed of 4 layers, each layer is provided with 8 groups of permanent magnets, and the number of groups can be increased or decreased according to demand. The optional size is 20×20×10mm 3 ,30×30×10mm 3 ,40×40×10mm 3 and 50×50×10mm 3 As shown in Table 1, the characteristics of different brands (performance levels) of permanent magnets commonly found on the market are summarized. Since the permanent magnets of the multilayer plate-type eddy current damper 4 can be easily disassembled, the number of permanent magnet groups, size and performance level can be flexibly adjusted according to actual application requirements.

[0049] Table 1 Characteristics of permanent magnets of different grades (performance levels)

[0050]

[0051] When the conductor copper plate 8 moves in the air gap between the symmetrical permanent magnets 7 on the adjacent magnetic steel plates 5 in a direction perpendicular to the magnetic flux lines (vertical or horizontal), eddy currents are generated in the conductor copper plate 8. The eddy current field interacts with the magnetic field, and the generated Lorentz force will hinder the relative movement between the conductor copper plate 8 and the magnetic field (Lenz's theorem). At the same time, the eddy currents are converted into heat energy and dissipated due to the resistance in the conductor copper plate 8, resulting in a damping effect. When the conductor copper plate 8 is connected to the vibrating structure, eddy currents are continuously generated on the conductor copper plate 8, and the kinetic energy of the structure is continuously converted into heat energy in the conductor copper plate 8, so that the vibration of the structure gradually decays.

[0052] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A vibration isolation type steam turbine generator set foundation, characterized in that: It comprises a basic platform, a plurality of connecting columns arranged on the basic platform, and a plurality of vibration isolators arranged between the basic platform and the plurality of connecting columns; The vibration isolator includes a first panel connected to the base platform, a second panel connected to the connecting column, a spring arranged between the first panel and the second panel, and a multi-layer plate-type eddy current damper arranged between the first panel and the second panel.

2. A vibration isolation type steam turbine generator set foundation as claimed in claim 1, characterized in that: A plurality of cylindrical bosses are provided on the first panel and the second panel; one end of the spring is sleeved on the cylindrical boss of the first panel, and the other end is sleeved on the cylindrical boss of the second panel; a positioning hole is provided inside the cylindrical boss, and the first panel and the second panel are connected by stud bolts.

3. The vibration isolation type steam turbine generator set foundation according to claim 1, characterized in that: The multi-layer plate type eddy current damper includes a plurality of magnetic steel plates, a cover plate, a plurality of permanent magnets, a plurality of conductive copper plates, a plurality of fixed blocks and a connecting piece; the plurality of magnetic steel plates are arranged at intervals perpendicular to a predetermined direction; permanent magnets are arranged on both sides of each magnetic steel plate; one end of the conductive copper plate is connected to the fixed block, and the fixed block is connected to the connecting piece; the other end of the conductive copper plate extends along a predetermined direction and is inserted into the gap between two adjacent permanent magnets.

4. A vibration isolation type steam turbine generator set foundation as claimed in claim 3, characterized in that: On the basic platform, the conductor copper plates in the vibration isolators on adjacent connecting columns are perpendicular to each other.

5. The vibration isolation type steam turbine generator set foundation according to claim 3, characterized in that: The cover plate is provided with a plurality of rectangular holes, and a plurality of conductor copper plates are inserted into the gaps between two adjacent permanent magnets after passing through the rectangular holes.

6. The vibration isolation type steam turbine generator set foundation according to claim 3, characterized in that: A plurality of permanent magnets are arranged on the magnetic steel plate, and the plurality of permanent magnets on the same side of the magnetic steel plate are arranged at intervals along a predetermined direction; two rows of permanent magnets with opposite magnetic pole directions are arranged on the same side of the magnetic steel plate along the moving direction of the conductor copper plate.

7. A vibration isolation type steam turbine generator set foundation as claimed in claim 6, characterized in that: The magnetic pole directions of the permanent magnets symmetrically arranged on two adjacent magnetic conductive steel plates are the same.

8. A vibration isolation method for steam turbine generator set foundation, characterized in that: The vibration isolation type steam turbine generator set foundation as described in any one of claims 1 to 7 is used, comprising: vibration isolation in the vertical direction and the horizontal direction respectively through spring vibration isolation and multi-layer plate eddy current damper.

9. A vibration isolation method for steam turbine generator set foundation according to claim 8, characterized in that: When the conductor copper plate moves in the air gap between the symmetrical permanent magnets on adjacent magnetic steel plates in a direction perpendicular to the magnetic flux lines, eddy currents are generated in the conductor copper plate. The eddy current field interacts with the magnetic field, and the generated Lorentz force will hinder the relative movement between the conductor copper plate and the magnetic field. At the same time, the eddy currents are converted into heat energy and dissipated due to the resistance in the conductor copper plate, resulting in a damping effect. When the conductor copper plate is connected to the vibrating structure, eddy currents are continuously generated on the conductor copper plate, and the kinetic energy is continuously converted into heat energy in the conductor copper plate, causing the vibration to gradually decay.

10. A steam turbine generator set, characterized in that: It comprises a vibration isolation type steam turbine generator set foundation as described in any one of claims 1 to 7.

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