A method and device for shock isolation of a converter valve

Abstract

The application discloses a converter valve shock isolation method and a shock isolation device, and relates to the technical field of converter valves, wherein the method comprises the following steps: fixing and installing a converter valve device to be protected on the top of an upper steel plate of a shock isolation device, and fixing and connecting a lower steel plate of the shock isolation device with a ground foundation; a sliding mechanism and a brittle limiting column are connected between the upper steel plate and the lower steel plate, the sliding mechanism is used for realizing the sliding of the upper steel plate relative to the lower steel plate in a horizontal plane, and the brittle limiting column is used for limiting the initial relative displacement of the upper steel plate and the lower steel plate; the critical sliding force of the brittle limiting column is determined based on the total mass of the converter valve device and a target seismic fortification acceleration, so that the brittle limiting column is subjected to shearing damage when a preset seismic load is reached. The application can take into account the stability of a support type converter valve under small earthquakes and the shock isolation effectiveness of the support type converter valve under large earthquakes.

Description

Technical Field

[0001] This invention relates to the field of converter valve technology, and specifically to a method and device for isolating converter valves. Background Technology

[0002] Converter valves are the core electrical equipment in ultra-high voltage (UHV) converter stations, enabling the conversion of AC to DC power. Their operational reliability directly affects the safety and stability of the power transmission system. The mainstream converter valve structure used in converter station valve halls is a multi-column supported structure. A single unit of this type of equipment can weigh approximately 240 tons, exhibiting a "top-heavy" shape with highly concentrated upper functional components and a lightweight lower support structure. Although the multi-column supported structure is better suited to the load-bearing requirements of heavy converter valves compared to the suspended type, its large upper load and high center of gravity significantly increase its structural vulnerability under seismic loads. Under seismic loads, the multiple support columns at the bottom of the converter valve will experience significant bending and shear deformation, making them highly susceptible to fracture and instability, ultimately leading to the complete destruction of the converter valve and causing large-scale power grid outages.

[0003] By installing seismic isolation devices between equipment and foundations, the natural period of the structure can be extended, seismic energy dissipated, and the seismic response of the equipment significantly reduced, making it an important means of resisting earthquake disasters. However, the special structure and load characteristics of multi-column supported converter valves make their seismic isolation requirements fundamentally different from those of conventional equipment, resulting in conventional seismic isolation technologies not being directly applicable: conventional seismic isolation cannot achieve precise triggering of the isolation action, and the seismic isolation devices are prone to malfunction under minor earthquakes and non-fortified vibrations, causing the converter valve to affect normal operation due to abnormal displacement, making it difficult to simultaneously ensure structural stability under minor earthquakes and seismic isolation effectiveness under major earthquakes. Summary of the Invention

[0004] The purpose of this invention is to provide a vibration isolation method and device for a converter valve, so as to balance the stability of the supported converter valve under small earthquakes and the vibration isolation effectiveness under large earthquakes.

[0005] The objective of this invention is achieved through the following technical solution: This invention provides a method for vibration isolation of a converter valve, comprising: The converter valve equipment to be protected is fixedly installed on the top of the upper steel plate of the vibration isolation device, and the lower steel plate of the vibration isolation device is fixedly connected to the ground foundation. A sliding mechanism and a brittle limiting post connect the upper and lower steel plates. The sliding mechanism allows the upper steel plate to slide relative to the lower steel plate in the horizontal plane. The brittle limiting post restricts the initial relative displacement between the upper and lower steel plates. The critical sliding force of the brittle limiting post is determined based on the total mass of the converter valve equipment and the target seismic fortification acceleration, so that the brittle limiting post will undergo shear failure when the preset seismic load is reached. By fixing the converter valve to the upper steel plate and the lower steel plate to the foundation, combined with the sliding mechanism and the brittle limiting post with a critical force set according to the total mass of the equipment and the fortification acceleration, a rigid connection is maintained during minor earthquakes, and the column failure during major earthquakes triggers seismic isolation sliding, thus balancing operational stability during minor earthquakes and seismic isolation protection during major earthquakes.

[0006] Optionally, a reset elastic element, which is pulsatorically connected to the sliding mechanism, is further provided between the upper steel plate and the lower steel plate. When the upper steel plate and the lower steel plate undergo relative displacement, the reset elastic element applies an elastic reset force to the upper steel plate in the opposite direction to the displacement of the upper steel plate, driving the upper steel plate to reset to its initial position. By providing a reset elastic element linked to the sliding mechanism between the upper and lower steel plates, a reverse reset force can be applied during vibration isolation displacement, driving the upper steel plate back to its initial position.

[0007] Optionally, the two ends of the brittle limiting post are fixedly connected to the bottom surface of the upper steel plate and the top surface of the lower steel plate, respectively. The design diameter of the brittle limiting post is determined based on the following formula:

[0008] In the formula, Indicates the design diameter. This indicates the total mass of the converter valve equipment. Indicates the target seismic fortification acceleration. This indicates the allowable shear stress of the material used in the brittle restraint column. By fixing the upper and lower plates at both ends of the brittle restraint column and designing the diameter according to the equipment mass, design acceleration, and the allowable shear stress formula of the material, the critical slip force can be accurately matched, ensuring accurate and reliable vibration isolation triggering.

[0009] Based on the same inventive concept, the present invention also provides a converter valve vibration isolation device, comprising: The top of the steel plate is used to fix and connect the converter valve equipment. The bottom of the steel plate is used to fix and connect to the ground foundation. The sliding mechanism includes an upper guide rail, a lower guide rail, and a slider. The upper guide rail is fixed to the bottom surface of the upper steel plate, and the lower guide rail is fixed to the top surface of the lower steel plate. Each slider has an upper groove and a lower groove that intersect in direction. The upper groove is slidably connected to the upper guide rail, and the lower groove is slidably connected to the lower guide rail. A brittle limiting post is fixedly connected at both ends to the bottom surface of the upper steel plate and the top surface of the lower steel plate, respectively. The upper and lower steel plates, the cross-guide rail slider sliding mechanism, and the brittle limiting posts fixed at both ends constitute a vibration isolation device, enabling bidirectional horizontal sliding while limiting the initial relative displacement of the equipment.

[0010] Optionally, the vibration isolation device further includes a reset elastic element, which includes a spring. One end of the spring is connected to the slider, and the other end of the spring is connected to the upper steel plate. By setting the spring connecting the slider and the upper steel plate as the reset elastic element, the upper steel plate can be automatically reset using the spring's elastic force. The structure is simple and the reset effect is stable.

[0011] Optionally, each slider is connected to at least two symmetrically arranged springs. By connecting each slider to at least two symmetrically arranged springs, the distribution of the reset force can be more balanced, improving the smoothness of the sliding and reset process.

[0012] Optionally, the reset elastic element further includes a damper, one end of which is connected to the slider, and the other end of which is fixedly connected to the lower steel plate. By adding a damper connecting the slider and the lower steel plate, seismic input energy can be dissipated, reducing the vibration amplitude and residual displacement of the seismic isolation sliding mechanism.

[0013] Optionally, the upper guide rail includes a first upper guide rail and a second upper guide rail arranged in parallel at intervals, the lower guide rail includes a first lower guide rail and a second lower guide rail arranged in parallel at intervals, and the slider includes a first slider, a second slider, a third slider, and a fourth slider arranged sequentially in a clockwise direction. The first slider is located at the intersection of the first upper guide rail and the first lower guide rail, the second slider is located at the intersection of the second upper guide rail and the first lower guide rail, the third slider is located at the intersection of the second upper guide rail and the second lower guide rail, and the fourth slider is located at the intersection of the first upper guide rail and the second lower guide rail. Through the layout of two sets of parallel upper and lower guide rails and four sliders at intersection points, the load of the converter valve can be evenly distributed, improving the load-bearing capacity and sliding stability of the vibration isolation device.

[0014] Optionally, the springs connected to the first and third sliders are arranged axially in a direction perpendicular to the upper guide rail, and the springs connected to the second and fourth sliders are arranged axially in a direction perpendicular to the lower guide rail. By arranging the springs along the directions perpendicular to the corresponding guide rails, the bidirectional sliding requirements on the horizontal plane can be accommodated, providing a balanced restoring force for displacements in different directions.

[0015] Optionally, the dampers connected to the first and third sliders are arranged axially along a direction perpendicular to the upper guide rail, and the dampers connected to the second and fourth sliders are arranged axially along a direction perpendicular to the lower guide rail. By arranging the dampers along directions perpendicular to the corresponding guide rails, seismic energy can be dissipated omnidirectionally, improving the energy dissipation and vibration reduction effect of the seismic isolation device.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a method for isolating a converter valve, comprising: fixing the converter valve equipment to be protected on the top of the upper steel plate of the isolation device, and fixing the lower steel plate of the isolation device to the ground foundation; a sliding mechanism and a brittle limiting column are connected between the upper steel plate and the lower steel plate, the sliding mechanism is used to realize the sliding of the upper steel plate relative to the lower steel plate in the horizontal plane, the brittle limiting column is used to limit the initial relative displacement between the upper steel plate and the lower steel plate, and the critical sliding force of the brittle limiting column is determined based on the total mass of the converter valve equipment and the target seismic fortification acceleration, so that the brittle limiting column will undergo shear failure when the preset seismic load is reached.

[0017] This invention, by fixing the converter valve to the top of the upper steel plate of the seismic isolation device and fixing the lower steel plate to the ground foundation, achieves unified load-bearing for the entire converter valve, avoiding structural damage caused by uneven stress on the support columns. By setting a sliding mechanism and a brittle limiting column between the upper and lower steel plates, the sliding mechanism enables relative sliding in the horizontal plane, and the brittle limiting column restricts the initial relative displacement, providing a structural foundation for seismic isolation sliding under large earthquakes and extending the natural vibration period of the converter valve structure. Furthermore, by basing the critical sliding force of the brittle limiting column on the total mass of the converter valve and the target seismic resistance... Determining the seismic fortification acceleration enables precise quantitative design of the seismic isolation trigger threshold, ensuring the reliability and targeted nature of the seismic isolation activation. By ensuring the integrity of the brittle limiting column when the seismic horizontal shear force is less than the critical slip force, the converter valve can maintain a rigid connection with the foundation, preventing malfunctions of the seismic isolation under minor earthquakes and normal operating vibrations, thus ensuring the stability of equipment operation. By ensuring the brittle fracture of the brittle limiting column when the seismic horizontal shear force is greater than or equal to the critical slip force, the displacement restriction can be automatically released and the seismic isolation sliding can be triggered, significantly reducing the seismic response of the converter valve and protecting the equipment from damage. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0019] Figure 1 This is a front view of a vibration isolation device according to an embodiment of the present invention; Figure 2 yes Figure 1 Sectional view along the middle AA direction; Figure 3 This is a schematic diagram of a converter valve installed above a vibration isolation device according to an embodiment of the present invention; Figure 4 The explosion of the vibration isolation device according to the embodiment of the present invention Figure 1 ; Figure 5 The explosion of the vibration isolation device according to the embodiment of the present invention Figure 2 ; Figure 6 The three-dimensional slider according to an embodiment of the present invention Figure 1 ; Figure 7 The three-dimensional slider according to an embodiment of the present invention Figure 2 ; In the picture: 1. Upper steel plate; 2. Lower steel plate; 3. Upper guide rail; 301. First upper guide rail; 302. Second upper guide rail; 4. Lower guide rail; 401. First lower guide rail; 402. Second lower guide rail; 5. Slider; 501. First slider; 502. Second slider; 503. Third slider; 504. Fourth slider; 51. Upper groove; 52. Lower groove; 6. Brittle limiting post; 7. Spring; 8. Damper. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. The following embodiments are provided to better understand the present invention and are not intended to limit the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0021] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures, and should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate a location or positional relationship based on the location or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific location, or be constructed and operated in a specific location. Therefore, the terms describing positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention. The terms "connected," "linked," "connected," and "set" used in the present invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] like Figures 1-7 As shown, the present invention provides a method for isolating a converter valve, characterized in that it includes: The converter valve equipment to be protected is fixedly installed on the top of the upper steel plate 1 of the vibration isolation device, and the lower steel plate 2 of the vibration isolation device is fixedly connected to the ground foundation. A sliding mechanism and a brittle limiting post 6 are connected between the upper steel plate 1 and the lower steel plate 2. The sliding mechanism is used to allow the upper steel plate 1 to slide relative to the lower steel plate 2 in the horizontal plane. The brittle limiting post 6 is used to limit the initial relative displacement between the upper steel plate 1 and the lower steel plate 2. The critical sliding force of the brittle limiting post 6 is determined based on the total mass of the converter valve equipment and the target seismic fortification acceleration, so that the brittle limiting post 6 will undergo shear failure when the preset seismic load is reached. Specifically: When the horizontal shear force generated by the earthquake is less than the critical slip force, the brittle confinement column 6 maintains the structural integrity. When the horizontal shear force generated by the earthquake is greater than or equal to the critical slip force, the brittle confinement column 6 undergoes brittle fracture.

[0024] In practical implementation, all support columns of the converter valve unit can be bolted to the top surface of the same upper steel plate 1, and the lower steel plate 2 of the vibration isolation device can be fixedly connected to the ground foundation using anchor bolts. A sliding mechanism (such as a sliding mechanism composed of guide rails and sliders) and a brittle limiting column 6 are set between the upper steel plate 1 and the lower steel plate 2. The sliding mechanism allows the upper steel plate 1 to slide relative to the lower steel plate 2 in the horizontal plane, and the brittle limiting column 6 can limit the initial relative displacement between the upper steel plate 1 and the lower steel plate 2. The critical sliding force of the brittle limiting column 6 can be determined based on the total mass of the converter valve equipment and the target seismic fortification acceleration. The target seismic fortification acceleration can be determined according to the seismic fortification intensity of the area where the converter station is located. For example, it is 0.2g in an 8-degree fortification zone and 0.4g in a 9-degree fortification zone.

[0025] When the horizontal shear force generated by the earthquake is less than the critical slip force, the brittle restraint column 6 maintains structural integrity, there is no relative displacement between the upper steel plate 1 and the lower steel plate 2, and the converter valve equipment remains rigidly connected to the foundation, maintaining normal operation. When the horizontal shear force generated by the earthquake is greater than or equal to the critical slip force, the brittle restraint column 6 undergoes brittle fracture, releasing the displacement restriction on the upper steel plate 1 and the lower steel plate 2. The upper steel plate 1 slides freely relative to the lower steel plate 2 in the horizontal plane through the sliding mechanism, prolonging the natural vibration period of the structure and reducing the seismic response of the converter valve equipment.

[0026] Compared to existing solutions, this invention proposes for the first time a seismic isolation control method that determines the critical sliding force of the brittle restraint column 6 based on the total mass of the converter valve equipment and the target seismic fortification acceleration. The method achieves precise triggering of the seismic isolation action through the brittle fracture of the brittle restraint column 6, maintaining a rigid connection between the equipment and the foundation under minor earthquakes and triggering seismic isolation sliding under major earthquakes. Conventional techniques in this field balance performance under both minor and major earthquakes by adjusting the horizontal stiffness of the seismic isolation device. However, this invention, by introducing a fractured brittle restraint column 6, achieves a switch between rigid locking under minor earthquakes and flexible seismic isolation under major earthquakes, thus solving the technical problem that conventional seismic isolation technologies cannot simultaneously achieve stability under minor earthquakes and effective seismic isolation under major earthquakes. By fixing all the support columns of the converter valve to the same upper steel plate 1, the overall force of the converter valve can be uniform, avoiding damage caused by excessive force on a single support column. Through the quantitative design of the critical sliding force, the vibration isolation action can be precisely triggered. Under minor earthquakes and normal operating vibrations of the equipment, the brittle limit column 6 remains intact, the converter valve equipment has no relative displacement, and does not affect normal operation. Under the action of a major earthquake, the brittle limit column 6 fractures brittlely, triggering the vibration isolation sliding, effectively reducing the seismic response of the converter valve equipment and protecting the support columns from bending, shear deformation and fracture.

[0027] Furthermore, a reset elastic element is provided between the upper steel plate 1 and the lower steel plate 2, which is connected to the sliding mechanism for transmission. When the upper steel plate 1 and the lower steel plate 2 are relatively displaced, the reset elastic element applies an elastic reset force to the upper steel plate 1 in the opposite direction to the displacement of the upper steel plate 1, driving the upper steel plate 1 to reset to the initial position.

[0028] In practice, the reset elastic element can be made of springs, dampers, rubber materials or shape memory alloys and other components with elastic recovery function. When an earthquake occurs, the upper steel plate 1 can slide relative to the lower steel plate 2 in the horizontal plane with the help of the sliding mechanism. At this time, with the help of the deformation energy storage of the reset elastic element, a continuous reset driving force can be provided for the upper steel plate 1 to reduce the maximum displacement amplitude of the upper steel plate 1 during the earthquake, thereby minimizing the impact of the earthquake on the operational stability of the converter valve equipment connected to the upper steel plate 1.

[0029] Furthermore, the two ends of the brittle limiting post 6 are fixedly connected to the bottom surface of the upper steel plate 1 and the top surface of the lower steel plate 2, respectively; The design diameter of the brittle limiting post 6 is determined based on the following formula:

[0030] In the formula, Indicates the design diameter. This indicates the total mass of the converter valve equipment. Indicates the target seismic fortification acceleration. This indicates the allowable shear stress of the material used for the brittle restraint post 6.

[0031] The specific principle behind the above formula is: based on the total mass of the converter valve equipment Target seismic fortification acceleration of converter valve equipment Through formula The critical starting force of the brittle restraint post can be obtained. According to the allowable shear stress of the material used for the brittle restraint post 6 Through formula The minimum shear cross-sectional area required to obtain the brittle restraint post 6 can be obtained. ; through formula The design diameter D of the brittle restraint post 6 can be derived.

[0032] In practical implementation, the brittle restraint post 6 can be made of high-carbon steel, and after quenching and low-temperature tempering, a martensitic structure is obtained to ensure its stable brittle fracture characteristics. External threads can be machined at both ends of the brittle restraint post 6, which are then fixedly connected to the upper steel plate 1 and the lower steel plate 2 respectively via these threads. For example, if the total mass of the converter valve is 200 tons, the target seismic fortification acceleration is 0.1g, and the allowable shear stress of the selected high-carbon steel in the quenched and low-temperature tempered state is... If the pressure is 250 MPa, then the design diameter of the brittle restraint post 6 is:

[0033] The step-by-step calculation process is as follows: Critical starting force ; Minimum shear cross-sectional area

[0034] Design diameter of brittle limiting post 6

[0035] In actual construction, the diameter of the brittle limiting post 6 can be rounded to 32mm.

[0036] The precise design of the critical sliding force of the brittle limiting post 6 in this invention can ensure reliable triggering of vibration isolation operation.

[0037] Based on the same inventive concept, the present invention also provides a converter valve vibration isolation device, comprising: The top surface of the upper steel plate 1 is used to fix and connect the converter valve equipment. Lower steel plate 2, the bottom surface of which is used to fix and connect to the ground foundation; The sliding mechanism includes an upper guide rail 3, a lower guide rail 4, and a slider 5. The upper guide rail 3 is fixed to the bottom surface of the upper steel plate 1, and the lower guide rail 4 is fixed to the top surface of the lower steel plate 2. Each slider 5 is provided with an upper groove 51 and a lower groove 52 that intersect in direction. The upper groove 51 is slidably connected to the upper guide rail 3, and the lower groove 52 is slidably connected to the lower guide rail 4. The brittle limiting post 6 is fixedly connected at both ends to the bottom surface of the upper steel plate 1 and the top surface of the lower steel plate 2, respectively.

[0038] In practical implementation, when the horizontal shear force is less than the critical sliding force, the brittle limiting post 6 remains intact, restricting the relative displacement between the upper steel plate 1 and the lower steel plate 2; when the horizontal shear force is greater than or equal to the critical sliding force, the brittle limiting post 6 undergoes brittle fracture, releasing the displacement restriction. The slider 5 adopts an integrated structure, with upper groove 51 and lower groove 52, which slide and engage with the upper guide rail 3 and lower guide rail 4 respectively, enabling bidirectional sliding in the horizontal plane and vertical pull-out protection. This integrated slider structure improves the overall strength and vertical pull-out resistance of the slider.

[0039] Furthermore, the vibration isolation device also includes a reset elastic element, which includes a spring 7. One end of the spring 7 is connected to the slider 5, and the other end of the spring 7 is connected to the upper steel plate 1.

[0040] In practice, hooks can be machined at both ends of the spring 7, which are hinged to the lugs on the slider 5 and the upper steel plate 1, respectively. When an earthquake occurs, the lower steel plate 2 causes the slider 5 to move relative to the upper steel plate 1, and the spring 7 is stretched or compressed, storing elastic potential energy. The elastic potential energy is then converted into kinetic energy, driving the upper steel plate 1 back to its initial position.

[0041] Furthermore, each slider 5 is connected to at least two symmetrically arranged springs 7.

[0042] In practice, a spring 7 can be set on each of the left and right sides or front and back sides of each slider 5. When the slider 5 slides along the guide rail, the spring 7 on one side is stretched and the spring 7 on the other side is compressed. The two springs 7 will simultaneously generate an elastic restoring force opposite to the displacement direction of the upper steel plate 1, driving the upper steel plate 1 to reset.

[0043] Furthermore, the reset elastic element also includes a damper 8, one end of which is connected to the slider 5, and the other end of which is fixedly connected to the lower steel plate 2.

[0044] In practice, the two ends of the damper 8 can be connected to the slider 5 and the lower steel plate 2 respectively through hinged supports. When the upper steel plate 1 drives the slider 5 to move relative to the lower steel plate 2, a damping force opposite to the direction of the relative displacement will be generated between the piston and the cylinder of the damper 8, effectively dissipating the input energy of the earthquake.

[0045] Furthermore, the upper guide rail 3 includes a first upper guide rail 301 and a second upper guide rail 302 arranged in parallel at intervals, the lower guide rail 4 includes a first lower guide rail 401 and a second lower guide rail 402 arranged in parallel at intervals, and the slider 5 includes a first slider 501, a second slider 502, a third slider 503 and a fourth slider 504 arranged in a clockwise direction. The first slider 501 is located at the intersection of the first upper guide rail 301 and the first lower guide rail 401, the second slider 502 is located at the intersection of the second upper guide rail 302 and the first lower guide rail 401, the third slider 503 is located at the intersection of the second upper guide rail 302 and the second lower guide rail 402, and the fourth slider 504 is located at the intersection of the first upper guide rail 301 and the second lower guide rail 402.

[0046] In specific implementation, the first upper guide rail 301 and the second upper guide rail 302 can be arranged parallel to each other laterally along the upper steel plate 1, and the first lower guide rail 401 and the second lower guide rail 402 can be arranged parallel to each other longitudinally along the lower steel plate 2. The weight of the converter valve equipment can be evenly distributed on the four sliders 5 through the upper steel plate 1, and the load borne by each slider 5 is 1 / 4 of the total weight of the converter valve. By adopting the cross arrangement of two upper guide rails 3 and two lower guide rails 4, and setting the four sliders 5 at the four intersection points, the weight of the converter valve equipment can be evenly distributed. This design reduces the load on a single slider 5 and the guide rail, which can improve the load-bearing capacity and stability of the vibration isolation device. At the same time, the symmetrical arrangement of the four sliders 5 can ensure the stability of the upper steel plate 1 when sliding in any direction.

[0047] Furthermore, the spring 7 connected to the first slider 501 and the third slider 503 is arranged axially in a direction perpendicular to the upper guide rail 3, and the spring 7 connected to the second slider 502 and the fourth slider 504 is arranged axially in a direction perpendicular to the lower guide rail 4.

[0048] In practice, the upper guide rail 3 and the lower guide rail 4 intersect perpendicularly to form a rectangular frame, such as... Figure 2As shown, the first slider 501, the second slider 502, the third slider 503, and the fourth slider 504 can be respectively positioned at the upper left, upper right, lower right, and lower left vertices of the rectangular frame. The lines connecting the first slider 501 and the third slider 503, and the lines connecting the second slider 502 and the fourth slider 504, form two mutually perpendicular diagonals of the rectangular frame, creating an X-shaped cross-force structure. Based on this, the springs 7 are arranged in a bidirectional orthogonal configuration matching the force direction of the X-shaped diagonals: one set of springs 7 is arranged along the extension direction (longitudinal) of the lower guide rail 4, connecting the first slider 501, the third slider 503, and the upper steel plate 1; the other set of springs 7 is arranged along the extension direction (transverse) of the upper guide rail 3, connecting the second slider 502, the fourth slider 504, and the upper steel plate 1.

[0049] The lines of action of the two sets of springs 7 coincide with the force direction of the X-shaped diagonal. The spring force in the diagonal direction will generate a greater tensile amount and a stronger resultant force pointing towards the center. This spring arrangement based on the X-shaped diagonal force allows the seismic isolation device to form an omnidirectional seismic isolation effect with no blind zone, high stiffness utilization, and fast response speed for seismic waves incident at any angle in the horizontal plane, thus effectively improving the reset efficiency and seismic isolation stability compared to the conventional orthogonal arrangement.

[0050] When seismic waves are input at any oblique angle (such as 30°, 45°, 60°, etc.), the displacement of the upper steel plate 1 can be decomposed into lateral and longitudinal components. At this time, the lateral spring 7 and the longitudinal spring 7 simultaneously undergo compound deformation: not only do they produce linear tension along their respective initial axes, but they also produce oblique tension at a certain angle to the initial axes due to the oblique displacement of the upper steel plate 1. Under the X-shaped diagonal force structure, the oblique tension angle of the springs 7 is further increased compared to the conventional orthogonal arrangement, which can accumulate more elastic potential energy. At the same time, the elastic forces generated by the lateral spring 7 and the longitudinal spring 7 are vectored and synthesized along the X-shaped diagonal direction, forming a concentrated resultant force that is completely opposite to the direction of oblique displacement, which can drive the upper steel plate 1 to accurately reset along the original displacement path without the need for an additional guiding mechanism.

[0051] When seismic waves contain torsional components or when uneven load distribution on the converter valve generates torsional moments, the X-shaped cross-arranged springs 7 will exhibit differentiated tension: the tension of springs 7 on the same side as the torsional direction will increase, while the tension of springs 7 on the other side will decrease, forming an anti-torsional moment opposite to the direction of the torsional moment. Since the force lines of springs 7 are distributed along the diagonal of the X-shape, the anti-torsional arm is the diagonal length of the rectangular frame, resulting in improved torsional stiffness compared to conventional orthogonal arrangements. This effectively suppresses the torsional vibration of the upper steel plate 1 and prevents uneven wear and jamming between the slider 5 and the guide rail.

[0052] Furthermore, the damper 8 connected to the first slider 501 and the third slider 503 is arranged axially in a direction perpendicular to the upper guide rail 3, and the damper 8 connected to the second slider 502 and the fourth slider 504 is arranged axially in a direction perpendicular to the lower guide rail 4.

[0053] In practical implementation, the damper 8 adopts an X-shaped diagonal force arrangement that is completely consistent with that of the spring 7, forming a spring-damper dual X-shaped cooperative force system: one set of dampers 8 is arranged along the extension direction of the lower guide rail 4, connecting the first slider 501, the third slider 503, and the lower steel plate 2 respectively; the other set of dampers 8 is arranged along the extension direction of the upper guide rail 3, connecting the second slider 502, the fourth slider 504, and the lower steel plate 2 respectively. The lines of action of the two sets of dampers 8 completely coincide with the lines of action of the corresponding spring 7, and both are consistent with the force direction of the X-shaped diagonal. This damper arrangement based on X-shaped diagonal force formation forms a deep synergy with the X-shaped structure of the spring 7. Since the damper 8 and the spring 7 are arranged coaxially, the directional energy dissipation blind zone in the damper arrangement can be eliminated.

[0054] When a seismic wave is input in the positive direction, the damper 8 in the corresponding direction deforms along its initial axis, stably dissipating seismic energy. When a seismic wave is input at any oblique angle, the damper 8 and the spring 7 undergo a combined deformation simultaneously: not only does it deform along the initial axis, but it also deforms at a certain angle to the initial axis due to the oblique displacement of the upper steel plate 1. Seismic energy is simultaneously transferred to the corresponding damper 8 through the four sliders 5, with each damper 8 distributing the energy evenly, avoiding the problem of overload of a single damper in conventional arrangements. When an earthquake exceeding the design intensity occurs, the four dampers 8 enter the working state, dissipating more seismic energy and protecting the converter valve equipment from damage. At the same time, since the damper 8 is connected between the slider 5 and the lower steel plate 2, seismic energy can be directly transferred to the damper 8 through the slider 5, without the need for secondary transfer through the guide rail and the upper and lower steel plates 2, resulting in a shorter energy transfer path and higher energy dissipation efficiency.

[0055] Based on the above design, compared with traditional seismic isolation devices, this invention has vertical tensile strength and horizontal stiffness that is almost zero in the initial stage. The damper can provide damping while providing nonlinear stiffness in the horizontal direction. When an earthquake occurs, most of the seismic energy can be dissipated through the device of this invention, thereby protecting the upper-supported converter valve equipment.

[0056] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention.

Claims

1. A method for isolating a converter valve, characterized in that, include: The converter valve equipment to be protected is fixedly installed on the top of the upper steel plate of the vibration isolation device, and the lower steel plate of the vibration isolation device is fixedly connected to the ground foundation. A sliding mechanism and a brittle limiting post are connected between the upper steel plate and the lower steel plate. The sliding mechanism is used to enable the upper steel plate to slide relative to the lower steel plate in the horizontal plane. The brittle limiting post is used to limit the initial relative displacement between the upper steel plate and the lower steel plate. The critical sliding force of the brittle limiting post is determined based on the total mass of the converter valve equipment and the target seismic fortification acceleration, so that the brittle limiting post will undergo shear failure when the preset seismic load is reached.

2. The vibration isolation method for the converter valve according to claim 1, characterized in that: A reset elastic element is also provided between the upper steel plate and the lower steel plate, which is connected to the sliding mechanism for transmission. When the upper steel plate and the lower steel plate are relatively displaced, the reset elastic element applies an elastic reset force to the upper steel plate in the opposite direction of the displacement of the upper steel plate, driving the upper steel plate to reset to the initial position.

3. The vibration isolation method for converter valves according to claim 1, characterized in that: The two ends of the brittle limiting post are fixedly connected to the bottom surface of the upper steel plate and the top surface of the lower steel plate, respectively. The design diameter of the brittle limiting post is determined based on the following formula: In the formula, Indicates the design diameter. This indicates the total mass of the converter valve equipment. Indicates the target seismic fortification acceleration. This indicates the allowable shear stress of the material used in the brittle restraint post.

4. A vibration isolation device for a converter valve, characterized in that, include: The top surface of the upper steel plate (1) is used to fix and connect the converter valve equipment; The bottom of the lower steel plate (2) is used to fix and connect to the ground foundation; The sliding mechanism includes an upper guide rail (3), a lower guide rail (4) and a slider (5). The upper guide rail (3) is fixed to the bottom surface of the upper steel plate (1), and the lower guide rail (4) is fixed to the top surface of the lower steel plate (2). Each slider (5) has an upper groove (51) and a lower groove (52) that intersect in direction. The upper groove (51) is slidably connected to the upper guide rail (3), and the lower groove (52) is slidably connected to the lower guide rail (4). A brittle limiting post (6) is fixedly connected at both ends to the bottom surface of the upper steel plate (1) and the top surface of the lower steel plate (2), respectively.

5. The vibration isolation device for the converter valve according to claim 4, characterized in that: The vibration isolation device also includes a reset elastic element, which includes a spring (7). One end of the spring (7) is connected to the slider (5), and the other end of the spring (7) is connected to the upper steel plate (1).

6. The vibration isolation device for the converter valve according to claim 5, characterized in that: Each of the sliders (5) is connected to at least two symmetrically arranged springs (7).

7. The vibration isolation device for the converter valve according to claim 5, characterized in that: The reset elastic element also includes a damper (8), one end of which is connected to the slider (5), and the other end of which is fixedly connected to the lower steel plate (2).

8. The vibration isolation device for the converter valve according to claim 7, characterized in that: The upper guide rail (3) includes a first upper guide rail (301) and a second upper guide rail (302) arranged in parallel intervals. The lower guide rail (4) includes a first lower guide rail (401) and a second lower guide rail (402) arranged in parallel intervals. The slider (5) includes a first slider (501), a second slider (502), a third slider (503), and a fourth slider (504) arranged in a clockwise direction. The first slider (501) is located at the intersection of the first upper guide rail (301) and the first lower guide rail (401). The second slider (502) is located at the intersection of the second upper guide rail (302) and the first lower guide rail (401). The third slider (503) is located at the intersection of the second upper guide rail (302) and the second lower guide rail (402). The fourth slider (504) is located at the intersection of the first upper guide rail (301) and the second lower guide rail (402).

9. The vibration isolation device for the converter valve according to claim 8, characterized in that: The spring (7) connected to the first slider (501) and the third slider (503) is arranged axially in a direction perpendicular to the upper guide rail (3), and the spring (7) connected to the second slider (502) and the fourth slider (504) is arranged axially in a direction perpendicular to the lower guide rail (4).

10. The vibration isolation device for the converter valve according to claim 9, characterized in that: The damper (8) connected to the first slider (501) and the third slider (503) is arranged axially in a direction perpendicular to the upper guide rail (3), and the damper (8) connected to the second slider (502) and the fourth slider (504) is arranged axially in a direction perpendicular to the lower guide rail (4).

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