Variable stiffness seismic isolation and damping limiting damper

Abstract

A variable stiffness seismic isolation and damping limiting damper relates to the field of dampers. The variable stiffness seismic isolation and damping limiting damper includes a piston sleeve with a piston cavity and a piston movable within the piston sleeve. The piston is connected to a piston rod extending through the piston sleeve. A sleeve support rod is connected to the end of the piston sleeve away from the piston rod. A variable diameter cavity is provided at the end of the piston cavity away from the piston rod, and the inner diameter of the variable diameter cavity gradually decreases as it moves away from the piston rod. Multiple compression pushers arranged circumferentially at intervals are connected to the end of the piston facing the variable diameter cavity. When the piston moves along the variable diameter cavity, it synchronously pushes or stops pushing the compression pushers on the inner wall of the variable diameter cavity, causing the compression pushers to rotate synchronously along the direction approaching or away from the piston sleeve axis. The variable stiffness seismic isolation and damping limiting damper achieves variable damping function by setting the compression pushers connected to the piston in the variable diameter cavity, thereby increasing the damping force with increasing displacement. It has the advantages of simple structure, low cost, and good vibration reduction effect.

Description

Technical Field

[0001] This application relates to the field of dampers, and more specifically, to a variable stiffness vibration isolation and damping limiting damper. Background Technology

[0002] Dampers are devices that dissipate the kinetic energy of a system through motion, and are widely used in the construction industry due to their excellent seismic isolation and damping effects. Currently, common damper devices provide a fixed damping force, which cannot vary with the damper's displacement, thus limiting their application. Variable stiffness dampers, where the damping force can vary with displacement, are mostly based on fluids such as shear-thickening fluids and magnetorheological fluids, resulting in complex structures, high costs, and difficulty in meeting the needs of large-scale deployment. Summary of the Invention

[0003] The purpose of this application is to provide a variable stiffness vibration isolation and damping limit damper, which realizes the variable damping function of increasing damping force as the displacement increases, and has the advantages of simple structure, convenient processing, low cost and good vibration reduction effect.

[0004] This application is implemented as follows:

[0005] This application provides a variable stiffness vibration isolation and damping limiter, which includes a piston sleeve with a piston cavity and a movable piston disposed in the piston sleeve. The piston is connected to a piston rod that slides through one end of the piston sleeve. A sleeve support rod is connected to the end of the piston sleeve away from the piston rod. A variable diameter cavity is provided at the end of the piston cavity away from the piston rod. The inner diameter of the variable diameter cavity gradually decreases as it moves away from the piston rod. A plurality of extrusion pushers are connected to the end of the piston facing the variable diameter cavity. When the piston moves along the variable diameter cavity, it causes the inner wall of the variable diameter cavity to synchronously push or stop pushing each extrusion pusher, so that each extrusion pusher rotates synchronously in the direction close to or away from the axis of the piston sleeve.

[0006] In some alternative implementations, an axial damping rod extending along the axial direction is connected to one end of the piston facing the variable diameter cavity. A damping friction ring that can rotate about its axis is fitted on the axial damping rod. Each extrusion pusher is hinged to the damping friction ring through a traction rod. When each extrusion pusher rotates synchronously in the direction close to or away from the piston sleeve axis, it drives each traction rod to move and pull the damping friction ring to reciprocate.

[0007] In some alternative embodiments, the outer wall of the axial damping rod is provided with an annular damping groove extending circumferentially therein, and the damping friction ring is rotatably disposed within the damping groove.

[0008] In some alternative implementations, the damping groove is provided with two annular buffer rubber rings, and the two ends of the damping friction ring respectively press against the two buffer rubber rings.

[0009] In some alternative implementations, the cross-section of the extrusion flap is fan-shaped.

[0010] In some alternative implementations, the surface edge of the extrusion flap fitting the variable diameter cavity is chamfered.

[0011] In some alternative embodiments, a first spherical hinge support and a second spherical hinge support are also included, which are respectively connected to the piston rod and the sleeve support rod.

[0012] In some alternative implementations, the first spherical hinge support and the second spherical hinge support are respectively connected to the bracket by connecting bolts.

[0013] In some alternative implementations, the edges of the piston surfaces that contact the piston chamber are chamfered.

[0014] In some alternative implementations, the inner wall of the variable-diameter cavity is arc-shaped.

[0015] The beneficial effects of this application are as follows: The variable stiffness vibration isolation and damping limiting damper provided by this application includes a piston sleeve with a piston cavity and a movable piston located inside the piston sleeve. The piston is connected to a piston rod that slides through one end of the piston sleeve. A sleeve support rod is connected to the end of the piston sleeve away from the piston rod. A variable diameter cavity is provided at the end of the piston cavity away from the piston rod. The inner diameter of the variable diameter cavity gradually decreases as it moves away from the piston rod. Multiple extrusion pushers are connected to the end of the piston facing the variable diameter cavity, arranged circumferentially at intervals. When the piston moves along the variable diameter cavity, it synchronously pushes or stops pushing each extrusion pusher on the inner wall of the variable diameter cavity, causing each extrusion pusher to rotate synchronously in the direction approaching or away from the axis of the piston sleeve. The variable stiffness vibration isolation and damping limiting damper provided by this application achieves the variable damping function of increasing damping force with increasing displacement by setting the extrusion pushers connected to the piston by the extrusion cavity. It also has the advantages of simple structure, convenient processing, low cost, and good vibration reduction effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic cross-sectional view of the variable stiffness vibration isolation and damping limiting damper provided in Embodiment 1 of this application along the axial direction.

[0018] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along section AA in the middle;

[0019] Figure 3 This is a cross-sectional view of the variable stiffness vibration isolation and damping limiting damper provided in Embodiment 2 of this application.

[0020] Figure 4 This is a partial cross-sectional view along the axial direction of the variable stiffness isolation and damping limiting damper provided in Embodiment 2 of this application, where the damping friction ring is disposed in the damping groove of the axial damping rod.

[0021] In the diagram: 100, piston sleeve; 110, piston chamber; 120, piston; 130, piston rod; 140, sleeve support rod; 150, variable diameter cavity; 160, extrusion pusher; 170, axial damping rod; 180, damping friction ring; 190, traction rod; 200, damping groove; 210, buffer rubber ring; 220, first spherical hinge support; 230, second spherical hinge support; 240, bracket; 250, connecting bolt. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] In this application, 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 below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The following detailed description of the features and performance of the variable stiffness seismic isolation and damping limit damper of this application is provided in conjunction with embodiments.

[0030] Example 1

[0031] like Figure 1 and Figure 2 As shown in the figure, this application provides a variable stiffness vibration isolation and damping limiting damper, which includes a piston sleeve 100 with a cylindrical piston cavity 110 inside, a cylindrical piston 120 movably disposed inside the piston sleeve 100, a first spherical hinge support 220 and a second spherical hinge support 230. The piston 120 is connected to a piston rod 130 that slides through one end of the piston sleeve 100. The end of the piston sleeve 100 away from the piston rod 130 is connected to a sleeve support rod 140. The surface edge of the piston 120 that contacts the piston cavity 110 is chamfered. The piston rod 130 and the sleeve support rod 140 are respectively connected to the first spherical hinge support 220 and the second spherical hinge support 230. The first spherical hinge support 220 and the second spherical hinge support 230 are respectively connected to a corresponding bracket 240 by connecting bolts 250.

[0032] A variable-diameter cavity 150 is provided at the end of the piston chamber 110 away from the piston rod 130. The inner wall of the variable-diameter cavity 150 is arc-shaped, and the inner diameter gradually decreases as it moves away from the piston rod 130. Six extrusion pushers 160 with fan-shaped cross-sections are connected to the end of the piston 120 facing the variable-diameter cavity 150. The extrusion pushers 160 are chamfered at the surface edge of the variable-diameter cavity 150. When the piston 120 moves along the variable-diameter cavity 150, it synchronously pushes or stops pushing each extrusion pusher 160 along the inner wall of the variable-diameter cavity 150, so that each extrusion pusher 160 rotates synchronously along the direction of approaching or moving away from the piston sleeve 100 axis to achieve contraction or expansion. In this embodiment, the piston 120, piston rod 130, and extrusion pushers 160 are integrally formed by casting.

[0033] The vibration reduction method of the variable stiffness seismic isolation and damping limiting damper provided in this application embodiment is as follows: The bracket 240, connecting the first spherical hinge support 220 and the second spherical hinge support 230, is respectively connected to both sides of the seismic isolation and damping component, such as a building. When an earthquake occurs, the building moves, which in turn causes relative movement between the first spherical hinge support 220 and the second spherical hinge support 230 at both ends of the variable stiffness seismic isolation and damping limiting damper via the bracket 240. This relative movement is caused by the first spherical hinge support 220 and the second spherical hinge support 230, which in turn causes relative movement between the piston rod 130 and the sleeve support rod 140. Finally, the piston rod 130 causes the piston 120 to reciprocate along the piston cavity 110. This generates friction between the outer wall of the piston 120 and the connected extrusion flaps 160 and the inner wall of the piston cavity 110, as well as resistance generated by gas compression within the piston cavity 110, providing damping force. Simultaneously, when the piston 120 moves axially towards the variable diameter cavity 15... When the piston moves, the inner wall of the variable diameter cavity 150 synchronously pushes each extrusion pusher 160, causing each extrusion pusher 160 to rotate synchronously along the axis closer to the piston sleeve 100 to achieve contraction. At this time, the friction between the variable diameter cavity 150 and each extrusion pusher 160 due to the extrusion action gradually increases as it approaches the variable diameter cavity 150. When the piston 120 moves axially away from the variable diameter cavity 150, the inner wall of the variable diameter cavity 150 synchronously and gradually stops pushing each extrusion pusher 160, causing each extrusion pusher 160 to rotate synchronously along the axis away from the piston sleeve 100 to achieve expansion. At this time, the extrusion action between the variable diameter cavity 150 and each extrusion pusher 160 decreases, causing the friction to gradually decrease as it approaches the variable diameter cavity 150. This allows the damping force to periodically increase and decrease due to the displacement change caused by the relative motion between the first spherical hinge support 220 and the second spherical hinge support 230, achieving variable stiffness vibration isolation and damping.

[0034] The piston 120 has a chamfered edge on the surface of its contact with the piston cavity 110 to prevent the piston 120 from scratching and damaging the inner wall of the piston sleeve 100 during its movement along the piston cavity 110. The piston rod 130 and the sleeve support rod 140 are respectively connected to the first spherical hinge support 220 and the second spherical hinge support 230. The first spherical hinge support 220 and the second spherical hinge support 230 are respectively connected to the bracket 240 by connecting bolts 250. When the bracket 240 moves in all directions, it can drive the connected first spherical hinge support 220 and the second spherical hinge support 230 to produce stable relative movement, thereby converting the relative motion between the first spherical hinge support 220 and the second spherical hinge support 230 into relative motion between the piston rod 130 and the sleeve support rod 140. The extrusion pusher 160 has a chamfered edge on the surface of its contact with the variable diameter cavity 150 to prevent the extrusion pusher 160 from scratching and damaging the inner wall of the piston sleeve 100 during its movement along the piston cavity 110 with the piston 120.

[0035] This application provides a variable stiffness seismic isolation and damping limiter, in which a piston sleeve 100 and a piston rod 130 are connected by a first spherical hinge support 220 and a second spherical hinge support 230, respectively. This solves the problem of instability caused by excessively rapid building movement during earthquakes, which is beneficial to the stability of the overall building structure. It also solves the problem of buildings being subjected to multi-directional forces due to earthquakes and can form high-frequency damping to reduce damage to the building. At the same time, the variable damping force generated by the compressible and expandable extrusion flap 160 solves the problem of earthquake energy being transmitted to the upper structure, so that the piston 120 reduces or isolates the horizontal seismic force. This ensures that the energy of the seismic force is transmitted to the piston sleeve 100 through the piston rod 130 and the sleeve support rod 140 and then weakened by friction and compressed gas resistance.

[0036] Example 2

[0037] like Figure 3 and Figure 4 As shown, this application provides a variable stiffness vibration isolation and damping limiting damper, which has a structure that is roughly the same as the variable stiffness vibration isolation and damping limiting damper provided in Embodiment 1. The difference is that in this embodiment, the piston 120 is connected to an axially arranged axial damping rod 170 at one end facing the variable diameter cavity 150. The outer wall of the axial damping rod 170 is provided with an annular damping groove 200 extending circumferentially. A damping friction ring 180 that can rotate around the axis of the axial damping rod 170 is sleeved in the damping groove 200. Each extrusion pusher 160 is hinged to the damping friction ring 180 through a traction rod 190. When each extrusion pusher 160 rotates synchronously in the direction close to or away from the axis of the piston sleeve 100, it drives each traction rod 190 to move and pull the damping friction ring 180 to rotate back and forth. Two annular buffer rubber rings 210 are also provided in the damping groove 200. The two ends of the damping friction ring 180 respectively press against the two buffer rubber rings 210.

[0038] The variable stiffness vibration isolation and damping limiting damper provided in this application embodiment has an axial damping rod 170 connected to one end of the piston 120 facing the variable diameter cavity 150, extending along its axial direction and arranged coaxially. A damping friction ring 180 is slidably sleeved on the axial damping rod 170. Each compression pusher 160 is hinged to the damping friction ring 180 through a traction rod 190. When each compression pusher 160 rotates synchronously along the direction approaching or away from the piston sleeve 100 axis, it synchronously drives each traction rod 190 to move and pull the damping friction ring 180 to reciprocate and rotate. The radial damping force of each compression pusher 160 rotating synchronously along the direction approaching or away from the piston sleeve 100 axis is converted into rotational friction force between the damping friction ring 180 and the axial damping rod 170 through each traction rod 190, realizing the conversion and transmission of damping force, thereby effectively improving the damping force of the variable stiffness vibration isolation and damping limiting damper and improving the vibration isolation and damping capacity.

[0039] The outer wall of the axial damping rod 170 is provided with an annular damping groove 200 extending circumferentially. The damping friction ring 180 is slidably disposed in the damping groove 200. The damping groove 200 can limit the position of the damping friction ring 180, ensuring that the damping force is stably converted from the radial rotation of the extrusion pusher 160 to the circumferential rotation of the damping friction ring 180. The damping groove 200 is also provided with two annular buffer rubber rings 210. The two ends of the damping friction ring 180 respectively press against the two buffer rubber rings 210. The two buffer rubber rings 210 can further buffer and block the position of the damping friction ring 180, avoiding wear between the two ends of the damping friction ring 180 and the damping groove 200 due to friction, thus extending the service life of the damping friction ring 180.

[0040] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A variable stiffness vibration isolation and damping limiting damper, comprising a piston sleeve with a piston cavity and a piston movably disposed within the piston sleeve, the piston being connected to a piston rod slidably extending through one end of the piston sleeve, and a sleeve support rod being connected to the end of the piston sleeve away from the piston rod, characterized in that, The piston chamber has a variable diameter cavity at the end away from the piston rod, and the inner diameter of the variable diameter cavity gradually decreases as it moves away from the piston rod. The piston is connected to a plurality of extrusion pushers arranged circumferentially at intervals at the end facing the variable diameter cavity. When the piston moves along the variable diameter cavity, it synchronously pushes or stops pushing each of the extrusion pushers on the inner wall of the variable diameter cavity, causing each of the extrusion pushers to rotate synchronously in a direction approaching or away from the piston sleeve axis. An axial damping rod is connected to the piston at the end facing the variable diameter cavity, and a damping friction ring that can rotate around its axis is fitted on the axial damping rod. Each extrusion pusher is hinged to the damping friction ring via a traction rod. When each of the extrusion pushers rotates synchronously in a direction approaching or away from the piston sleeve axis, it drives each traction rod to move, pulling the damping friction ring to reciprocate.

2. The variable stiffness vibration isolation and damping limiting damper according to claim 1, characterized in that, The outer wall of the axial damping rod is provided with an annular damping groove extending circumferentially therein, and the damping friction ring is rotatably disposed in the damping groove.

3. The variable stiffness vibration isolation and damping limiting damper according to claim 2, characterized in that, The damping groove is provided with two annular buffer rubber rings, and the two ends of the damping friction ring respectively press against the two buffer rubber rings.

4. The variable stiffness vibration isolation and damping limiting damper according to claim 1, characterized in that, The cross-section of the extrusion flap is fan-shaped.

5. The variable stiffness vibration isolation and damping limiting damper according to claim 1, characterized in that, The surface edge of the extrusion pusher that fits into the variable diameter cavity has a chamfer.

6. The variable stiffness vibration isolation and damping limiting damper according to claim 1, characterized in that, It also includes a first spherical hinge support and a second spherical hinge support that are respectively connected to the piston rod and the sleeve support rod.

7. The variable stiffness vibration isolation and damping limiting damper according to claim 6, characterized in that, The first spherical hinge support and the second spherical hinge support are respectively connected to the bracket by connecting bolts.

8. The variable stiffness vibration isolation and damping limiting damper according to claim 1, characterized in that, The piston has a chamfered edge on the surface that contacts the piston cavity.

9. The variable stiffness vibration isolation and damping limiting damper according to claim 1, characterized in that, The inner wall of the variable diameter cavity is arc-shaped.

Images