Self-resetting variable damping force generation method, energy consumption structure and shock isolation device and method

Abstract

The invention discloses a self-resetting variable damping force generation method, an energy consumption structure and a shock isolation device and method, and relates to the technical field of shock absorption. The method comprises the following steps that S1, a variable damping shell with an inner cavity is arranged, and a liquid inlet and a liquid outlet are formed in the two ends of the variable damping shell; s2, a sliding variable damping core piece is arranged in the shell; s3, forming an inner passage in the core part to form a through liquid path; s4, the end, facing the liquid outlet, of the core piece is in a cone shape, and the liquid outlet comprises a round hole part; s5, driving a liquid medium to be injected into a liquid inlet by means of movement of an external oil cylinder and a piston; s6, the medium is shunted, one part of the core pushing piece faces the liquid outlet, and the other part of the core pushing piece moves towards the liquid outlet through the inner passage; and S7, damping force is generated along with the movement speed change of the core piece. The outlet area of the variable damping part can be adjusted in real time, the damping force is automatically adjusted according to the external load or speed, optimal energy dissipation is achieved under different seismic intensities, and the seismic performance and the adaptive capacity of the structure are enhanced.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology, specifically to a method for generating self-resetting variable damping force, an energy-dissipating structure, and a vibration isolation device and method. Background Technology

[0002] Liquid storage tanks are widely used in critical infrastructure such as petrochemical, power, and water utilities. Their safety and stability under seismic loads are directly related to the safety of life and property and the protection of the ecological environment. Due to their relatively flexible structure and large liquid mass, liquid storage tanks are prone to significant shaking, liquid impact, and structural yielding during earthquakes, and may even overturn or be destroyed, causing serious disasters in many actual earthquakes.

[0003] To improve the seismic performance of liquid storage tanks, seismic strategies generally fall into two categories: First, adjusting the tank design and altering the size and number of supports. However, this approach is still susceptible to damage in earthquakes exceeding the design intensity. As critical national equipment, storage tanks cannot be allowed to enter a plastic state; therefore, traditional seismic design methods are unsuitable. Second, using seismic isolation or adding energy dissipation devices. Currently, most seismic isolation for liquid storage tanks is either a single isolation method or involves adding a certain number of energy dissipation devices to the foundation. This strategy can withstand some earthquakes to a certain extent, but because the design isolation stiffness and the damping coefficient of the added energy dissipation devices are fixed, it can only be designed for a specific earthquake magnitude. When encountering earthquakes below the design magnitude, it generates significant additional stiffness and damping, weakening the isolation effect. Furthermore, when encountering other unforeseen rare earthquakes, this isolation system may fail to meet seismic requirements. Seismic isolation bearings may also exhibit residual deformation after undergoing multiple large displacements.

[0004] The design of scheme CN119821870A discloses a self-resetting semi-underground liquid storage tank with multi-element damping units and its damping method. The tank has two-section self-resetting sidewall units externally, connected to the surrounding soil via an eddy current damping-inertial capacitance unit. This scheme uses eddy currents, which is a semi-active control method. It relies on the relative velocity between the permanent magnet and the conductor, and the conductor material; the damping performance decreases significantly at low speeds. The reset process relies on the inertial energy released by the rotating mass disk and the permanent magnet system to drive the ball screw to reset, making the reset process complex.

[0005] The design scheme in publication number CN119711326A proposes a self-resetting seismic isolation spherical bearing. Vibration-damping springs are arranged in the east, west, south, and north directions on the basin ring walls of the upper and lower bearing assemblies to absorb vibrations and stresses generated by external forces such as earthquakes. The bearing returns to its original position after the external force is eliminated through the elasticity and restoring force of the springs. However, this scheme uses seismic isolation springs to provide the restoring force and does not include an independent adjustable damping unit, resulting in weak energy dissipation capacity under strong earthquakes.

[0006] The design scheme in Publication No. CN119801157A describes a seismic isolation and anti-seismic device for buildings. It involves arranging upper and lower support plates, constructing convex plates on the opposite surfaces of the support plates, connecting the convex plates with rubber protective frames, arranging multiple layers of rubber and steel plates, and constructing disc grooves between the top plates, in which limiting blocks are installed. These limiting blocks restrict the displacement of the isolation layer and dissipate some seismic energy. However, this scheme utilizes the deformation and frictional energy dissipation of elliptical limiting blocks. In the event of large displacement, it cannot provide stable and effective self-resetting capability, and residual deformation may occur after an earthquake.

[0007] The design in CN119711646A discloses a self-resetting friction pendulum seismic isolation bearing, comprising upper and lower sliding components and a central support plate. The central support plate has a sliding groove and a reset groove, with a reset component housed within the reset groove. Seismic isolation is achieved through the upper and lower sliding components, and reset is accomplished through the reset component. However, this design relies primarily on friction due to the use of a friction pendulum, lacking damping adjustment capability. The friction coefficient may degrade or become uneven during use, making it impossible to dynamically adjust energy dissipation capacity based on seismic intensity.

[0008] The design scheme in publication number CN119531516A presents a high-damping magnetorheological isolation device. It controls the stiffness and damping of the isolation support by changing the magnetic field strength. When the slider moves downwards, the gear rotates, causing the return spring to stretch, which in turn moves the rack. This design is adaptable to different types of ground motion and achieves the function of seismic isolation. However, this scheme requires adjusting the damping force of the magnetorheological damper through an external electromagnetic field, relying on a power supply and control system. The return mechanism depends on the gear-rack-return spring linkage, making the mechanism complex. Furthermore, the gear transmission may fail in environments with mud, sand, or dust.

[0009] Existing seismic isolation and damping devices mostly employ eddy currents, friction pendulums, magnetorheological materials, or limiting structures to achieve energy dissipation and reset functions. Some devices rely on external power sources or complex mechanical systems for damping adjustment and reset, resulting in complex structures, insufficient reliability, and susceptibility to interference in harsh environments. Secondly, their damping adjustment capabilities are limited, making it difficult to achieve adaptive adjustment based on seismic intensity, especially under low-velocity or minor earthquakes where energy dissipation is ineffective. Some structures exhibit weak self-reset capabilities under large displacements, easily exhibiting residual deformation after an earthquake, affecting their service life and safety. Furthermore, some devices fail to effectively distinguish between restoring force and energy dissipation mechanisms, leading to performance coupling and making it difficult to independently optimize damping and reset effects. Summary of the Invention

[0010] To address one of the shortcomings of existing technologies, this invention provides a self-resetting variable damping force generation method, an energy-consuming structure, and a vibration isolation device and method, thereby solving the vibration isolation technology problem of liquid storage tanks.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a self-resetting variable damping force generation method, comprising: S1. A variable damping shell with an internal cavity structure is provided, and an inlet and an outlet communicating with the internal cavity are respectively provided at both ends of the variable damping shell. S2. A sliding variable damping core is installed inside the variable damping housing; S3. An internal passage is opened inside the variable damping core, and the internal passage forms a through-flow liquid channel structure on the variable damping core. S4. The end of the variable damping core facing the liquid outlet of the variable damping housing is machined into a cone shape, and the liquid outlet of the variable damping housing includes a circular hole. S5. Through the external oil cylinder and piston structure, the movement of the piston drives the liquid medium to be injected into the inlet of the variable damping housing. S6. Divert the liquid medium injected into the variable damping shell; a portion of the diverted liquid medium exerts a thrust on the variable damping core, with the thrust direction towards the outlet of the variable damping shell; the other portion of the liquid medium moves towards the outlet of the variable damping shell through the internal passage of the variable damping core. S7. The damping force is generated as the speed of the variable damping core changes. , and the speed of the piston rod of the external hydraulic cylinder satisfy:

[0012]

[0013]

[0014]

[0015] =

[0016]

[0017] in, The area around the conical surface of the variable damping core component's conical structure where the liquid flows. For flow coefficient; It is speed function ; It is the density of the liquid medium; It is the cross-sectional area of ​​the inner cavity of the hydraulic cylinder; Let be the cross-sectional area of ​​the piston rod; The frictional force generated by the variable damping core component; The inner diameter of the circular hole at the liquid outlet of the variable damping housing; The diameter of the cone-shaped end of the variable damping housing; The angle of the apex of the cone structure of the variable damping core component.

[0018] An energy-consuming structure, applied to the aforementioned self-resetting variable damping force generation method, includes a variable damping section that can be supplied with a liquid medium, the variable damping section comprising: The variable damping housing has an internal cavity, and an inlet and an outlet are respectively provided at both ends of the variable damping housing; The variable damping core is disposed in the cavity of the variable damping housing and is slidably connected to the cavity of the variable damping housing; the variable damping core has an internal passage, one end of which extends to the end of the variable damping core facing the liquid inlet of the variable damping housing, and the other end extends to the end of the variable damping core facing the liquid outlet of the variable damping housing; the end of the variable damping core facing the liquid outlet is a cone. A sealing element is provided at the liquid inlet end of the variable damping housing; the sealing element is provided with a group of through holes that allow liquid medium to pass through, and at least one through hole in the group of through holes is opposite to the end of the inner passage facing the liquid inlet.

[0019] Preferably, the inner passage on the variable damping core is a "T" shaped channel, with the liquid inlet end of the inner passage forming a liquid inlet hole at the center of the end of the variable damping core facing the variable damping shell, and the liquid outlet end of the inner passage forming two liquid outlet holes on both sides of the conical structure of the variable damping core.

[0020] Preferably, the sealing element is a block, and the through-hole assembly of the sealing element includes: The center hole is located at the center of the sealing component, and the center hole is coaxial with the liquid inlet hole of the variable damping core component; Several side holes are provided around the central hole.

[0021] Preferably, the sealing element further includes: An adjustment hole is provided on the side of the central hole, and at least one adjustment hole is provided. The adjusting element and the adjusting hole are detachably connected.

[0022] Preferably, the variable damping section further includes: A variable damping reset component is disposed between the liquid outlet of the variable damping core and the variable damping housing.

[0023] Preferably, it also includes: A one-way communication section is provided on the liquid inlet side of the variable damping section, and the communication direction of the one-way communication section is that it can communicate with the liquid inlet of the variable damping housing.

[0024] A seismic isolation device, comprising: The isolation rod is linked at its end to the structure that needs to be isolated. The limiting part has a piston inside; the two sides of the limiting part are respectively connected to a aforementioned energy-consuming structure through pipelines; the communication directions of the energy-consuming structures on both sides of the limiting part are opposite; the piston divides the interior of the limiting part into two chambers, and the liquid inlet and liquid outlet of the energy-consuming structure are respectively connected to one of the chambers. A reset part is provided on one side of the limiting part; The vibration isolation rod passes through the limiting part and the reset part, and is slidably connected with the limiting part and the reset part, while the piston and the vibration isolation rod are fixedly connected.

[0025] Preferably, the limiting portion includes: The limiting shell has an internal cavity, and the piston is slidably connected to the cavity inside the limiting shell; A limiting component assembly is provided on each side of the piston, and the limiting component assembly is an elastic structure.

[0026] Preferably, the reset part includes: The reset shell has an internal cavity, and one end of the reset shell is connected to the limiting shell; Two baffles are provided inside the cavity of the reset shell. The baffles are slidably connected to the reset shell. In the natural state, the two baffles are located at both ends inside the cavity of the reset shell. A reset assembly is disposed between the two baffles, and the reset assembly is an elastic structure.

[0027] Preferably, both the limiting component group and the resetting component group are disc spring groups; In its natural state, there is a gap between the end of the limiting component assembly and the cavity of the reset shell; the reset component assembly is in a pre-compression state. The total restoring force of the limiting part and the resetting part, which is also the stiffness restoring force. satisfy,

[0028] in, Initial preload for the reset assembly; The stiffness of the disc spring in the reset assembly; For the stiffness of the disc spring in the limiting component assembly; This represents the displacement of the seismic isolation layer; This is the limit distance.

[0029] A vibration isolation method, using the aforementioned vibration isolation device, applied to the vibration isolation of a liquid storage tank, includes the following steps: A1. Collect parameters of the storage tank, including the tank wall height. ; radius of the storage tank The height of the liquid in the storage tank Liquid density Elastic modulus of the liquid storage tank wall The density of the tank wall is ; A2. Based on the collected parameters, the required seismic isolation restoring force of the seismic isolation device is obtained, satisfying the following formula.

[0031]

[0032] in, For point masses with convective mass, For liquid-solid coupled mass particles, As a rigid mass point mass, the convective mass and the fluid-solid coupled mass pass through the equivalent spring stiffness. , and damping coefficient , Connected to the tank wall, For the stiffness of lead-core rubber seismic isolation bearings, This represents the ratio of the stiffness of the lead-core rubber bearing after yielding to its stiffness before yielding. For hysteresis components, The restoring force provided for the self-resetting variable damping device.

[0033] Compared with existing technologies, it has the following beneficial effects: The damping force of the energy dissipation device in this scheme can be adjusted in real time by changing the outlet area of ​​the variable damping section. The damping force can be automatically adjusted according to the external load or speed to achieve optimal energy dissipation under different earthquake intensities, thereby enhancing the seismic performance and adaptability of the structure.

[0034] This solution integrates passive variable damping energy dissipation, limit and reset functions into one, enabling effective control under different excitation scenarios.

[0035] This device is passively controlled and requires no energy input.

[0036] This solution provides strong stiffness recovery force during large displacements, effectively limiting the structure and preventing excessive deformation or damage due to extreme loads, thus improving the system's safety redundancy.

[0037] The internal structural design of this scheme incorporates an elastic reset element, which enables the device to automatically return to its initial state after the external force is removed, avoiding residual deformation and ensuring the post-earthquake functionality and continuity of use.

[0038] This solution integrates variable damping, limiting, and reset functions into a single device, simplifying system construction, facilitating installation and maintenance, and making it suitable for practical engineering applications of high-performance vibration reduction and isolation systems.

[0039] This solution connects directly to the seismic isolation bearings without altering the structure of the seismic isolation layer, making it simple to install and easy to promote. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the energy consumption structure of an embodiment of this application; Figure 2 This is a cross-sectional view of the energy consumption structure according to an embodiment of this application; Figure 3 This is an internal structure diagram of an embodiment of this application; Figure 4 This is a simplified model diagram of the energy consumption structure according to an embodiment of this application; Figure 5 This is a schematic diagram of the vibration isolation device structure according to an embodiment of this application; Figure 6 This is a front view of the vibration isolation device according to an embodiment of this application; Figure 7 for Figure 6 AA cross-section view; Figure 8 This is a schematic diagram of the vibration isolation device in use according to an embodiment of this application; Figure 9 This is a schematic diagram of the working state of the vibration isolation device according to an embodiment of this application; Figure 10 This is a simplified schematic diagram of a liquid storage tank model according to an embodiment of this application.

[0041] In the picture: 100. Liquid storage tank; 110. Vibration isolation bearing; 120. Vibration isolation device; 1. Energy-consuming structure; 11. Variable damping section; 111. Variable damping shell; 112. Variable damping core; 1121. Internal passage; 113. Sealing component; 1131. Adjusting component; 114. Variable damping reset component; 12. One-way communication section; 2. Vibration isolation rods; 3. Limiting part; 31. Limiting shell; 32. Piston; 33. Limiting component assembly; 4. Reset part; 41. Reset shell; 42. Baffle; 43. Reset component assembly; 44. Vibration isolation rod sleeve. Detailed Implementation

[0042] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] See Figures 1 to 3 This application provides the following technical solutions: Methods for generating self-resetting variable damping force include: S1. A variable damping housing 111 with an internal cavity structure is provided, and an inlet and an outlet communicating with the internal cavity are respectively provided at both ends of the variable damping housing 111. S2. A sliding variable damping core 112 is provided inside the variable damping housing 111; S3. An internal passage 1121 is opened inside the variable damping core 112, and the internal passage 1121 forms a through-flow liquid passage structure on the variable damping core 112. S4. The end of the variable damping core 112 facing the liquid outlet of the variable damping housing 111 is machined into a conical shape, and the liquid outlet of the variable damping housing 111 includes a circular hole. S5. Through the external oil cylinder and piston structure, the movement of the piston drives the liquid medium to be injected into the inlet of the variable damping housing 111. S6. Divert the liquid medium injected into the variable damping housing 111; a portion of the diverted liquid medium exerts a thrust on the variable damping core 112, with the thrust direction toward the outlet of the variable damping housing 111; the other portion of the liquid medium moves toward the outlet of the variable damping housing 111 through the inner passage 1121 of the variable damping core 112. S7 generates damping force as the motion speed of the variable damping core 112 changes. Damping force here This refers to the damping force fed back to the "piston" through hydraulic fluid. The variable damping force generated by the variable damping energy-consuming component is mainly determined by the outlet area of ​​the conical variable damping core 112, which can be represented by a simplified model. Figure 9 express, and the speed of the piston rod of the external hydraulic cylinder satisfy:

[0044]

[0045]

[0046]

[0047]

[0048] =

[0049]

[0050] in, The area of ​​liquid flow around the cone surface of the variable damping core 112 cone structure; For flow coefficient; It is speed function ; It is the density of the liquid medium; It is the cross-sectional area of ​​the inner cavity of the oil cylinder, which is the cross-sectional area of ​​the inner cavity of the limiting shell 31 mentioned later; This is the cross-sectional area of ​​the piston rod, which is also the cross-sectional area of ​​the vibration isolation rod 2 mentioned later. The frictional force generated by the variable damping core 112; The inner diameter of the circular hole at the liquid outlet of the variable damping housing 111; The diameter of the tapered bottom at the end of the variable damping housing 111; This refers to the angle of the apex of the conical structure of the variable damping core 112. The piston rod of the external cylinder mentioned here is the vibration isolation rod 2, which will be further explained later. In the formula... This refers to the velocity of the isolation rod 2, but the velocity of the isolation rod 2 affects the velocity of the variable damping core 112, and the two are directly proportional. All formulas for the variable damping force and velocity are... The relationship between the velocity of the isolation rod 2 and the damping force There is also a proportional velocity relationship between it and the variable damping core 112.

[0051] Based on the above implementation scheme, this scheme provides an energy-consuming structure applied to the aforementioned self-resetting variable damping force generation method, including a variable damping part 11 that can be circulated with a liquid medium. The variable damping part 11 includes a variable damping shell 111 with an internal cavity, and an inlet and an outlet are respectively provided at both ends of the variable damping shell 111. The variable damping shell 111 is cylindrical in shape. A variable damping core 112 is slidably disposed within the cavity of the variable damping shell 111, and the variable damping core 112 slides along the length direction of the cavity of the variable damping shell 111. An internal passage 1121 is provided inside the variable damping core 112, one end of which extends to the end of the variable damping core 112 facing the liquid inlet of the variable damping shell 111, and the other end extends to the end of the variable damping core 112 facing the liquid outlet of the variable damping shell 111. The end of the variable damping core 112 facing the liquid outlet is conical. A sealing element 113 is provided at the liquid inlet end of the variable damping housing 111. The sealing element 113 is provided with a group of through holes that allow liquid medium to pass through. At least one through hole in the group of through holes is opposite to the end of the inner passage 1121 facing the liquid inlet.

[0052] When the external cylinder pushes hydraulic oil to the inlet end of the variable damping housing 111, the hydraulic oil enters the interior of the variable damping housing 111 through the sealing member 113. Part of the hydraulic oil pushes the variable damping valve core 112 to move, while the other part enters the inner passage 1121 of the variable damping valve core 112, and then flows out from the other end of the variable damping valve core 112 to the outlet of the variable damping housing 111. This structure, combined with the aforementioned method, generates variable damping force. The faster the variable damping valve core 112 moves, the greater the damping force generated. This energy-consuming structure is mainly applied to seismic-resistant structures.

[0053] Based on the above implementation scheme, the inner passage 1121 on the variable damping core 112 is a "T" shaped channel. The liquid inlet end of the inner passage 1121 forms a liquid inlet hole at the center of the end of the variable damping core 112 facing the variable damping housing 111, and the liquid outlet end of the inner passage 1121 forms two liquid outlet holes on both sides of the conical structure of the variable damping core 112.

[0054] Based on the above implementation scheme, the sealing component 113 is a cylindrical block, and the through hole group of the sealing component 113 includes: a central hole and four side holes arranged around the central hole. The central hole is opened at the center of the sealing component 113 and is coaxial with the liquid inlet through hole of the variable damping core 112; the side holes are evenly distributed around the central hole.

[0055] The hydraulic oil is dispersed by the structure of the sealing component 113, causing a certain degree of diversion between the hydraulic oil entering the inner passage 1121 and driving the variable damping core 112. It should be noted that the diversion mentioned here does not mean that the liquid in the central hole and the side hole are completely separated, but only relatively dispersed according to their outflow direction. In fact, the hydraulic oil is mixed together after passing through the sealing component 113.

[0056] Based on the above implementation scheme, the sealing component 113 also includes an adjustment hole, which is located on the side of the central hole, and an adjustment component 1131 is detachably connected to the adjustment hole. By assembling and disassembling the adjustment component 1131, the adjustment hole can be opened or closed.

[0057] Based on the above implementation scheme, the variable damping part 11 also includes a variable damping reset member 114 disposed between the liquid outlet of the variable damping core 112 and the variable damping housing 111. The variable damping reset member 114 can be a spring.

[0058] See Figure 2 and Figure 3The variable damping core 112 adopts a multi-segment block structure, including two cylinders with different outer diameters arranged in a stepped manner. The cylinder with a larger outer diameter is located close to the sealing component 113, while the end of the cylinder with a smaller outer diameter has the aforementioned conical block structure. The liquid outlet of the inner passage 1121 is located at the cylinder with a smaller outer diameter. The variable damping reset component 114 is sleeved on the outside of the cylinder with a smaller outer diameter.

[0059] A groove is provided on the periphery of the column with a large outer diameter, and a sealing ring can be placed in the groove.

[0060] Based on the above implementation scheme, a one-way communication section 12 is provided on the liquid inlet side of the variable damping section 11. The communication direction of the one-way communication section 12 is toward the liquid inlet of the variable damping housing 111.

[0061] See Figure 2 The one-way communication section 12 adopts a one-way valve structure. The one-way communication section 12 includes a communication housing. One end of the communication housing is threadedly connected to the end of the variable damping housing 111. The connection method here is that the end of the communication housing has an external thread, and the end of the variable damping housing 111 with the sealing element 113 has an internal thread; the two are threaded together. The stability of the sealing element 113 is improved by the abutment between the end edge structure of the communication housing and the sealing element. A slider is provided inside the one-way communication section 12. A sealing ball plug is provided between the slider and the inlet end of the communication housing. The slider and the ball plug abut against each other, and a spring is provided on the other side of the slider. This structure enables one-way entry of hydraulic oil.

[0062] Based on the above implementation plan, see Figures 5 to 7 This solution also provides a vibration isolation device, including a vibration isolation rod 2, a limiting part 3, a reset part 4, and the aforementioned energy dissipation structure 1. The end of the vibration isolation rod 2 is linked to the structure requiring vibration isolation; a piston 32 is installed inside the limiting part 3; both sides of the limiting part 3 are connected to an energy dissipation structure 1 via pipelines; the communication directions of the energy dissipation structures 1 on both sides of the limiting part 3 are opposite; the piston 32 divides the interior of the limiting part 3 into two chambers, and the inlet and outlet ends of the energy dissipation structure 1 are respectively connected to one of the chambers; the limiting part 3 corresponds to the hydraulic cylinder in the aforementioned variable damping force generation method. The reset part 4 is fixedly connected to one side of the limiting part 3, the vibration isolation rod 2 passes through the limiting part 3 and the reset part 4, and is slidably connected to the limiting part 3 and the reset part 4; the piston 32 and the vibration isolation rod 2 are fixedly connected.

[0063] The vibration isolation device in this solution is used for vibration reduction of the liquid storage tank. See [link / reference]. Figure 8This is a schematic diagram showing the vibration isolation device in use. A vibration isolation support 110 is installed at the lower part of the liquid storage tank 100, and the vibration isolation device 120 of this scheme is installed inside the vibration isolation support 110. Through the combination of the various components of this scheme, the vibration isolation device of this scheme has an integrated function of energy dissipation, limiting, and resetting, which has a very good effect on the vibration reduction of the liquid storage tank.

[0064] Based on the above implementation scheme, the limiting part 3 includes a limiting shell 31 and a limiting component assembly 33. The limiting shell 31 has a cavity inside, and the piston 32 is slidably connected to the cavity inside the limiting shell 31; a limiting component assembly 33 is provided on each side of the piston 32, and the limiting component assembly 33 is an elastic structure.

[0065] The reset unit 4 includes a reset shell 41, baffles 42, and a reset component assembly 43. The reset shell 41 has an internal cavity, and one end of the reset shell 41 is connected to a limiting shell 31. Two baffles 42 are disposed within the cavity of the reset shell 41, and the baffles 42 are slidably connected to the reset shell 41. In their natural state, the two baffles 42 are located at opposite ends within the cavity of the reset shell 41. The reset component assembly 43 is disposed between the two baffles 42 and is an elastic structure. A vibration isolation rod sleeve 44 is also disposed inside the reset shell 41. The vibration isolation rod sleeve 44 is sleeved on the outside of the vibration isolation rod 2 located inside the reset shell 41, and the vibration isolation rod sleeve 44 moves with the vibration isolation rod 2. The end of the vibration isolation rod sleeve 44 is configured with a "T" shape. The vibration isolation rod sleeve 44 drives the baffle 42 to move, thereby compressing the reset component assembly 43.

[0066] Both the limiting component assembly 33 and the resetting component assembly 43 are disc spring assemblies; in their natural state, there is a gap between the ends of the limiting component assembly 33 and the cavity of the resetting shell 41; the resetting component assembly 43 is in a pre-compressed state. The limiting part 3 and the resetting part 4 are connected by a flange.

[0067] The total restoring force of the limiting part 3 and the reset part 4, which is also the stiffness restoring force. satisfy,

[0068] in, Initial preload for the reset assembly (43); For the stiffness of the disc spring in the reset assembly (43); The stiffness of the disc spring in the limiting component assembly (33); This represents the displacement of the seismic isolation layer; The limiting distance is the distance between the end of the disc spring and the end of the inner cavity of the limiting shell (31) in the initial state.

[0069] See Figure 9 The working principles of this solution regarding energy consumption, reset, and limit switching are as follows: When the vibration isolating rod 2 moves, it drives the piston 32 and the vibration isolating rod sleeve 44 to move together. When the displacement is small, the limiting component does not reach the limiting distance, the disc spring of the limiting component group 33 is not compressed, and no limiting restoring force is generated. The reset component group 43 adds a restoring force on the basis of the preload as the piston rod moves. After the vibration isolating rod 2 moves, the energy dissipation structure 1 drives the piston 32 to compress hydraulic oil and enter the energy dissipation structure 1 through the pipeline, generating energy dissipation. The energy dissipation structure, the limiting part 3, and the reset part 4 work together to have energy dissipation, limiting, and reset functions.

[0070] For the energy-consuming structure 1, its variable damping section 11 and one-way connecting section 12 are connected in series and arranged anti-symmetrically on both sides of the limiting section 3. When hydraulic oil enters the external pipelines on both sides, only one-way connecting section 12 on one side is opened, and at the same time, the hydraulic oil enters the variable damping section 11. After passing through the sealing member 113, fluid force is generated on the variable damping core 112, pushing the variable damping core 112 to move. The conical end of the variable damping core 112 is close to the liquid outlet. Because the cone head is designed in a cone shape, it has different cross-sectional areas. When it is inserted into the liquid outlet, different hydraulic oil outflow areas are generated, forming different pressure differences between the liquid inlet and outlet of the variable damping section 11, thereby generating variable damping force. When the vibration isolation rod 2 moves in the opposite direction, the one-way connecting section 12 on the other side opens, thereby causing the variable damping section 11 connected in series to generate variable damping force. In this way, the energy-consuming mechanism 1 can play a role and generate variable damping force when the vibration isolation rod 2 moves back and forth.

[0071] If the length of the variable damping reset member 114 between the variable damping core 112 and the variable damping housing 111 is greater than the intracavity distance of the variable damping housing 111, the variable damping reset member 114 is in a compressed state and has a certain preload. When the liquid velocity at the inlet of the variable damping section 11 is low, the liquid pressure acting on the variable damping core 112 is less than the preload of the variable damping reset member 114, and the variable damping core 112 does not move, and the liquid outlet area remains unchanged. Only when the velocity increases to a certain threshold does the fluid force acting on the variable damping core 112 exceed the preload of the variable damping reset member 114, and the variable damping core 112 moves. When the length of the variable damping reset member 114, located between the variable damping core 112 and the variable damping section 11, is equal to the intracavity distance, the variable damping reset member 114 is not compressed, i.e., there is no pre-pressure. As long as there is liquid flow at the inlet of the variable damping section 11, the fluid force generated on the variable damping core 112 will cause the variable damping reset member 114 to compress, leading to the movement of the variable damping core 112, which in turn causes a change in the outlet area of ​​the variable damping section 11, thus achieving the effect of variable damping energy dissipation. The preload and stiffness of the variable damping reset member 114 control the speed threshold for generating variable damping and the rate of change of the cone valve outlet area, respectively.

[0072] The movement of the vibration isolation rod 2 drives the movement of the piston 32 inside the limiting part 3. When the vibration isolation rod 2 moves to one side, the limiting component group 33 in that direction moves in the same direction under the push of the piston 32. When the displacement is small, the limiting component group 33 is still in a free state and does not generate a limiting restoring force. When the displacement reaches the limiting distance, the disc spring on that side of the limiting component group 33 is compressed due to hitting the cylinder heads or connecting flanges on both sides, generating a limiting restoring force. At the same time, the disc spring in the other direction of the limiting component group 33 is still in a free state and does not generate a limiting restoring force. When the vibration isolation rod 2 moves in the other direction, only the disc spring on the side of the movement generates a limiting restoring force. In this way, a limiting restoring force can be generated during the reciprocating motion of the vibration isolation rod 2.

[0073] The reset assembly 43 of the reset section 4 is located between the baffles 42 on both sides and is pre-compressed by pre-tightening nuts, resulting in a certain preload. When the vibration isolation rod 2 moves to one side, it moves the baffle 42 on one side of the reset assembly 43 together, further compressing the disc spring of the reset assembly 43. As the displacement increases, the resulting reset and restoring force increases. When the vibration isolation rod 2 moves in the opposite direction, it exhibits the same reverse motion pattern.

[0074] The energy-consuming structure 1, the reset part 4, and the limiting part 3 all function under the drive of the vibration isolation rod 2, and the three work together. The symmetrical arrangement of the device enables the device to produce the same motion law in reciprocating motion.

[0075] The working principle of this vibration isolation device for liquid storage tank vibration isolation system: The seismic isolation device 120 is horizontally arranged in the seismic isolation layer, forming a seismic isolation system together with the seismic isolation bearing 110. The seismic isolation device 120 is connected to the bottom of the liquid storage tank 100 and the fixed base plate connected to the ground through connecting components. When an earthquake occurs, the seismic isolation bearing 110 and the upper liquid storage tank 100 move horizontally, and the seismic isolation rod 2 of the seismic isolation device 120 moves simultaneously. Through the movement of the seismic isolation rod 2, the energy dissipation structure 1, the limiting part 3, and the reset part 4 generate corresponding damping forces and restoring forces, respectively.

[0076] When the earthquake intensity is low, the velocity and displacement of the isolation rod 2 are small, the damping force and self-resetting force generated by the isolation device 120 are very small, and the limiting part 3 does not generate the limiting restoring force because it does not reach the limiting distance. The safety of the upper liquid storage tank 100 structure can be ensured by the damping force and restoring force generated by the isolation support 110.

[0077] As the earthquake intensity increases, the velocity and displacement acting on the isolation rod 2 both increase, resulting in a greater energy dissipation capacity for the energy-dissipating structure 1. The limiting part 3 generates a limiting restoring force after reaching its limiting displacement, and simultaneously, the reset restoring force increases. The greater the earthquake intensity, the more pronounced the effect of the isolation device 120.

[0078] The workflow of this solution: During an earthquake, the isolation layer undergoes horizontal movement under the input of seismic energy, causing the isolation rod 2 to undergo horizontal displacement. The velocity and displacement of the isolation rod 2 are transmitted to the energy dissipation structure 1, the limiting part 3, and the reset part 4, respectively. The energy dissipation structure 1 then dissipates the input seismic energy. If the earthquake intensity is large and the displacement of the isolation layer is too large, the limiting part 3 provides a limiting and restoring force to prevent the isolation layer from undergoing large displacement. After the earthquake ends, the reset and restoring force provided by the reset part 4 reduces the residual deformation of the isolation bearing 110, allowing the isolation bearing 110 to reset.

[0079] Based on the above implementation plan, see Figure 10 This solution also provides a vibration isolation method, using the aforementioned vibration isolation device, applied to the vibration isolation of a liquid storage tank, including the following steps: Parameters of the storage tank 100 are collected, including the height of the storage tank 100. ; radius of the storage tank The height of the liquid in the storage tank Liquid density Elastic modulus of the liquid storage tank wall The density of the tank wall is ; definition:

[0080]

[0081]

[0082]

[0083]

[0084] in, It refers to the quality of the stored liquid;

[0085]

[0086]

[0087]

[0088]

[0089]

[0090]

[0091]

[0092]

[0093] in, The isolation frequency; , , Each corresponds to a point mass. , , The damping ratio is set according to the seismic isolation design.

[0094]

[0095]

[0096] in, For point masses with convective mass, For liquid-solid coupled mass particles, As a rigid mass point mass, the convective mass and the fluid-solid coupled mass pass through the equivalent spring stiffness. , and damping coefficient , Connected to the tank wall, For the stiffness of lead-core rubber seismic isolation bearings, This represents the ratio of the stiffness of the lead-core rubber bearing after yielding to its stiffness before yielding. For hysteresis components, The restoring force provided for the self-resetting variable damping device. Based on this method, it can be determined what specific parameters are needed to manufacture the aforementioned vibration isolation device to meet the requirements of different liquid storage tanks.

[0097] In the description of this application and its embodiments, it should be understood that the terms "top", "bottom", "height", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0098] In this application and its embodiments, unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0099] In this application and its embodiments, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above, directly below, diagonally above, or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0100] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0101] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0102] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for generating self-resetting variable damping force, characterized in that, include: S1. A variable damping shell with an internal cavity structure is provided, and an inlet and an outlet communicating with the internal cavity are respectively provided at both ends of the variable damping shell. S2. A sliding variable damping core is installed inside the variable damping housing; S3. An internal passage is opened inside the variable damping core, and the internal passage forms a through-flow liquid channel structure on the variable damping core. S4. The end of the variable damping core facing the liquid outlet of the variable damping housing is machined into a cone shape, and the liquid outlet of the variable damping housing includes a circular hole. S5. Through the external oil cylinder and piston structure, the movement of the piston drives the liquid medium to be injected into the inlet of the variable damping housing. S6. Divert the liquid medium injected into the variable damping shell; a portion of the diverted liquid medium exerts a thrust on the variable damping core, with the thrust direction towards the outlet of the variable damping shell; the other portion of the liquid medium moves towards the outlet of the variable damping shell through the internal passage of the variable damping core. S7. The damping force is generated as the speed of the variable damping core changes. , and the speed of the piston rod of the external hydraulic cylinder satisfy: ； ； ； ； = ； ； in, The area around the conical surface of the variable damping core component's conical structure where the liquid flows. For flow coefficient; It is speed function ; It is the density of the liquid medium; It is the cross-sectional area of ​​the inner cavity of the hydraulic cylinder; Let be the cross-sectional area of ​​the piston rod; The frictional force generated by the variable damping core component; The inner diameter of the circular hole at the liquid outlet of the variable damping housing; The diameter of the cone-shaped end of the variable damping housing; The angle of the apex of the cone structure of the variable damping core component.

2. An energy-consuming structure, characterized in that, The method for generating self-resetting variable damping force as described in claim 1 includes a variable damping section that can be introduced into a liquid medium, the variable damping section comprising: The variable damping housing has an internal cavity, and an inlet and an outlet are respectively provided at both ends of the variable damping housing; The variable damping core is disposed in the cavity of the variable damping housing and is slidably connected to the cavity of the variable damping housing; the variable damping core has an internal passage, one end of which extends to the end of the variable damping core facing the liquid inlet of the variable damping housing, and the other end extends to the end of the variable damping core facing the liquid outlet of the variable damping housing; the end of the variable damping core facing the liquid outlet is a cone. A sealing element is provided at the liquid inlet end of the variable damping housing; the sealing element is provided with a group of through holes that allow liquid medium to pass through, and at least one through hole in the group of through holes is opposite to the end of the inner passage facing the liquid inlet.

3. The energy consumption structure as described in claim 2, characterized in that, The inner passage on the variable damping core is a "T" shaped channel. The liquid inlet end of the inner passage forms a liquid inlet hole at the center of the end of the variable damping core facing the variable damping shell, and the liquid outlet end of the inner passage forms two liquid outlet holes on both sides of the conical structure of the variable damping core.

4. The energy consumption structure as described in claim 3, characterized in that, The sealing element is a block, and the through-hole assembly of the sealing element includes: The center hole is located at the center of the sealing component, and the center hole is coaxial with the liquid inlet hole of the variable damping core component; Several side holes are provided around the central hole.

5. The energy consumption structure as described in claim 4, characterized in that, The sealing component also includes: An adjustment hole is provided on the side of the central hole, and at least one adjustment hole is provided. The adjusting element and the adjusting hole are detachably connected.

6. The energy consumption structure as described in claim 3, characterized in that, The variable damping section further includes: A variable damping reset component is disposed between the liquid outlet of the variable damping core and the variable damping housing.

7. The energy consumption structure as described in claim 2, characterized in that, Also includes: A one-way communication section is provided on the liquid inlet side of the variable damping section, and the communication direction of the one-way communication section is that it can communicate with the liquid inlet of the variable damping housing.

8. A vibration isolation device, characterized in that, include: The isolation rod is linked at its end to the structure that needs to be isolated. The limiting part has a piston inside; the two sides of the limiting part are respectively connected to an energy-consuming structure according to any one of claims 2-7 through pipelines; the communication directions of the energy-consuming structures on both sides of the limiting part are opposite; the piston divides the interior of the limiting part into two chambers, and the liquid inlet end and liquid outlet end of the energy-consuming structure are respectively connected to one of the chambers; A reset part is provided on one side of the limiting part; The vibration isolation rod passes through the limiting part and the reset part, and is slidably connected with the limiting part and the reset part, while the piston and the vibration isolation rod are fixedly connected.

9. The vibration isolation device as described in claim 8, characterized in that, The limiting part includes: The limiting shell has an internal cavity, and the piston is slidably connected to the cavity inside the limiting shell; A limiting component assembly is provided on each side of the piston, and the limiting component assembly is an elastic structure.

10. The vibration isolation device as described in claim 9, characterized in that, The reset unit includes: The reset shell has an internal cavity, and one end of the reset shell is connected to the limiting shell; Two baffles are provided inside the cavity of the reset shell. The baffles are slidably connected to the reset shell. In the natural state, the two baffles are located at both ends inside the cavity of the reset shell. A reset assembly is disposed between the two baffles, and the reset assembly is an elastic structure.

11. The vibration isolation device as described in claim 10, characterized in that, Both the limiting component group and the resetting component group are disc spring groups; In its natural state, there is a gap between the end of the limiting component assembly and the cavity of the reset shell; the reset component assembly is in a pre-compression state. The total restoring force of the limiting part and the resetting part, which is also the stiffness restoring force. satisfy, ； in, Initial preload for the reset assembly; The stiffness of the disc spring in the reset assembly; For the stiffness of the disc spring in the limiting component assembly; This represents the displacement of the seismic isolation layer; This is the limit distance.

12. A seismic isolation method, characterized in that, Using the vibration isolation device as described in any one of claims 8-11, applied to the vibration isolation of a liquid storage tank, includes the following steps: A1. Collect parameters of the storage tank, including the tank wall height. ; radius of the storage tank The height of the liquid in the storage tank Liquid density Elastic modulus of the liquid storage tank wall The density of the tank wall is ; A2. Based on the collected parameters, the required seismic isolation restoring force of the seismic isolation device is obtained, satisfying the following formula. ； ； in, For point masses of convective mass, For liquid-solid coupled mass particles, As a rigid mass point mass, the convective mass and the fluid-solid coupled mass pass through the equivalent spring stiffness. , and damping coefficient , Connected to the tank wall, For the stiffness of lead-core rubber seismic isolation bearings, This represents the ratio of the stiffness of the lead-core rubber bearing after yielding to its stiffness before yielding. For hysteresis components, The restoring force provided for the self-resetting variable damping device.

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