Variable-stiffness shock insulation and absorption limiting damper

Abstract

The invention discloses a variable-stiffness shock insulation and absorption limiting damper, and relates to the field of dampers. The variable-stiffness shock insulation and absorption limiting damper comprises a piston sleeve provided with a piston cavity and a piston movably arranged in the piston sleeve, the piston is connected with a piston rod penetrating out of the piston sleeve, the end, away from the piston rod, of the piston sleeve is connected with a sleeve supporting rod, and the end, away from the piston rod, of the piston cavity is provided with a variable-diameter cavity. The inner diameter of the variable-diameter cavity is gradually reduced along the direction away from the piston rod, and the end, facing the variable-diameter cavity, of the piston is connected with a plurality of extrusion push petals arranged at intervals in the circumferential direction of the piston. When the piston moves along the variable-diameter cavity, the inner wall of the variable-diameter cavity synchronously pushes or stops pushing all the extrusion pushing petals, and all the extrusion pushing petals synchronously rotate in the direction close to or away from the axis of the piston sleeve. According to the variable-stiffness shock insulation and absorption limiting damper, the variable-damping function that the damping force is increased along with the increase of displacement is achieved by arranging the variable-diameter cavity to extrude all the extrusion push petals connected with the piston, and the variable-stiffness shock insulation and absorption limiting damper has the advantages of being simple in structure, low in cost and good in shock absorption effect.

Description

Technical Field

[0001] The present application relates to the field of dampers, and in particular to a variable stiffness isolation and shock absorbing limit damper. Background Art

[0002] A damper is a device that dissipates the energy of a system through movement. It is widely used in the construction field because of its good isolation and shock absorption effect. The damping force provided by common damper devices is fixed and cannot produce different damping forces as the displacement of the damper changes, which limits its use. Variable stiffness dampers whose damping force can partially change with displacement are mostly based on fluids such as shear thickening fluid and magnetorheological fluid, which results in a complex structure and high cost of variable stiffness dampers, making it difficult to meet the needs of large-scale promotion and use. Summary of the invention

[0003] The purpose of the present application is to provide a variable stiffness seismic isolation and shock absorbing limit damper, which realizes the variable damping function of increasing the 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: The present application provides a variable stiffness seismic isolation, shock absorbing and limit damper, which includes a piston sleeve with a piston cavity therein and a piston movably arranged in the piston sleeve, the piston being connected to a piston rod slidingly passing through one end of the piston sleeve, the end of the piston sleeve away from the piston rod being connected to a sleeve support rod, the end of the piston cavity away from the piston rod being provided with a variable diameter cavity, the inner diameter of the variable diameter cavity gradually decreases as it moves away from the piston rod, and the end of the piston facing the variable diameter cavity being connected to a plurality of extrusion push petals arranged at intervals along its circumference; when the piston moves along the variable diameter cavity, the inner wall of the variable diameter cavity synchronously pushes or stops pushing each extrusion push petal, so that each extrusion push petal synchronously rotates in a direction close to or away from the axis of the piston sleeve.

[0005] In some optional embodiments, an axial damping rod extending along the axial direction of the piston is connected to one end of the piston facing the variable diameter cavity, and a damping friction ring rotatable around its axis is sleeved on the axial damping rod. Each extrusion push petal is hinged to the damping friction ring through a traction rod. When each extrusion push petal rotates synchronously in a direction close to or away from the axis of the piston sleeve, it drives each traction rod to move and pull the damping friction ring to rotate reciprocatingly.

[0006] In some optional embodiments, the outer wall of the axial damping rod is provided with an annular damping groove extending along its circumference, and the damping friction ring is rotatably disposed in the damping groove.

[0007] In some optional implementation schemes, two annular buffer rubber rings are provided in the damping slide groove, and two ends of the damping friction ring press against the two buffer rubber rings respectively.

[0008] In some optional embodiments, the cross-section of the extrusion push petal is fan-shaped.

[0009] In some optional embodiments, the surface edge of the extruded push flap that fits the variable diameter cavity is chamfered.

[0010] In some optional embodiments, it also includes a first spherical hinge support and a second spherical hinge support respectively connected to the piston rod and the sleeve support rod.

[0011] In some optional embodiments, the first spherical hinge support and the second spherical hinge support are respectively connected to the bracket via connecting bolts.

[0012] In some optional embodiments, the edge of the surface of the piston in contact with the piston chamber is chamfered.

[0013] In some optional embodiments, the inner wall of the variable diameter cavity is arc-shaped.

[0014] The beneficial effects of the present application are as follows: the variable stiffness seismic isolation and shock absorbing limit damper provided by the present application comprises a piston sleeve with a piston cavity therein and a piston movably arranged in the piston sleeve, the piston is connected to a piston rod slidingly passing through one end of the piston sleeve, the end of the piston sleeve away from the piston rod is connected to a sleeve support rod, the end of the piston cavity away from the piston rod is provided with a variable diameter cavity, the inner diameter of the variable diameter cavity gradually decreases as it moves away from the piston rod, and the end of the piston facing the variable diameter cavity is connected to a plurality of extrusion push petals arranged at intervals along its circumference; when the piston moves along the variable diameter cavity, the inner wall of the variable diameter cavity synchronously pushes or stops pushing each extrusion push petal, so that each extrusion push petal synchronously rotates in a direction close to or away from the axis of the piston sleeve. The variable stiffness seismic isolation and shock absorbing limit damper provided by the present application realizes the variable damping function of increasing the damping force as the displacement increases by setting the extrusion push petals connected to the variable diameter cavity to squeeze the piston, and has the advantages of simple structure, convenient processing, low cost and good vibration reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic cross-sectional structure diagram of the variable stiffness seismic isolation and damping limit damper provided in Example 1 of the present application along the axial direction; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the AA section line; Figure 3A schematic diagram of the cross-sectional structure of the variable stiffness seismic isolation and damping limit damper provided in Example 2 of the present application; Figure 4 A schematic diagram of the partial sectional structure along the axial direction when the damping friction ring of the variable stiffness seismic isolation and damping limit damper provided in Example 2 of the present application is arranged in the damping groove of the axial damping rod.

[0017] In the figure: 100, piston sleeve; 110, piston chamber; 120, piston; 130, piston rod; 140, sleeve support rod; 150, variable diameter cavity; 160, extrusion push petal; 170, axial damping rod; 180, damping friction ring; 190, traction rod; 200, damping slide groove; 210, buffer rubber ring; 220, first spherical hinge support; 230, second spherical hinge support; 240, bracket; 250, connecting bolt. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] The features and performance of the variable stiffness seismic isolation and vibration-absorbing limit damper of the present application are further described in detail below in conjunction with the embodiments.

[0026] Example 1 like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a variable stiffness seismic isolation and damping limit damper, which includes a piston sleeve 100 with a cylindrical piston cavity 110, a cylindrical piston 120 movably arranged in 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, and the surface edge of the piston 120 in contact with 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, and the first spherical hinge support 220 and the second spherical hinge support 230 are respectively connected to a corresponding bracket 240 through a connecting bolt 250; A variable diameter cavity 150 is provided at one end of the piston cavity 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. The end of the piston 120 facing the variable diameter cavity 150 is connected to six extrusion push petals 160 with a fan-shaped cross section and arranged at intervals along its circumference. The surface edges of the extrusion push petals 160 that fit the variable diameter cavity 150 are chamfered; when the piston 120 moves along the variable diameter cavity 150, the inner wall of the variable diameter cavity 150 synchronously pushes or stops pushing each extrusion push petal 160, so that each extrusion push petal 160 synchronously rotates in a direction close to or away from the axis of the piston sleeve 100 to achieve contraction or expansion. In this embodiment, the piston 120, the piston rod 130 and the extrusion push petals 160 are integrally formed by casting; The vibration reduction method of the variable stiffness seismic isolation and shock absorbing limit damper provided in the embodiment of the present application is as follows: the bracket 240 connecting the first spherical hinge support 220 and the second spherical hinge support 230 is respectively connected to the two sides of the seismic isolation component that needs vibration reduction, such as a building. When an earthquake occurs, the building is driven to move, and then the first spherical hinge support 220 and the second spherical hinge support 230 at both ends of the variable stiffness seismic isolation and shock absorbing limit damper are driven through the bracket 240 to generate relative movement, thereby driving the piston rod 130 and the sleeve support rod 140 to generate relative movement through the first spherical hinge support 220 and the second spherical hinge support 230, and finally the piston rod 130 drives the piston 120 to reciprocate along the piston cavity 110, so that the friction force generated by the outer wall of the piston 120 and the connected extrusion push petals 160 and the inner wall of the piston cavity 110 and the resistance generated by the compression of the gas in the piston cavity 110 provide damping force. At the same time, when the piston 120 moves axially toward the variable diameter cavity 15 0 moves, the inner wall of the variable diameter cavity 150 synchronously pushes each extrusion push petal 160, so that each extrusion push petal 160 synchronously rotates in the direction close to the axis of the piston sleeve 100 to achieve contraction. At this time, due to the extrusion effect, the friction force between the variable diameter cavity 150 and each extrusion push petal 160 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 gradually stops pushing each extrusion push petal 160, so that each extrusion push petal 160 synchronously rotates in the direction away from the axis of the piston sleeve 100 to achieve expansion. At this time, the extrusion effect between the variable diameter cavity 150 and each extrusion push petal 160 is reduced, resulting in the friction force gradually decreasing as it approaches the variable diameter cavity 150, so that the damping force is periodically increased and decreased with the displacement change caused by the relative movement between the first spherical hinge support 220 and the second spherical hinge support 230 to achieve variable stiffness isolation and shock absorption.

[0027] Among them, the surface edge of the piston 120 in contact with the piston chamber 110 is provided with a chamfer to prevent the piston 120 from scratching and damaging the inner wall of the piston sleeve 100 during the movement of the piston chamber 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, and the first spherical hinge support 220 and the second spherical hinge support 230 are respectively connected to the bracket 240 connected by the connecting bolt 250, which can drive the connected first spherical hinge support 220 and the second spherical hinge support 230 to produce stable relative movement when the bracket 240 moves in all directions, so that the relative movement between the first spherical hinge support 220 and the second spherical hinge support 230 is converted into relative movement between the piston rod 130 and the sleeve support rod 140; the surface edge of the extrusion push petal 160 that fits the variable diameter cavity 150 is provided with a chamfer to prevent the extrusion push petal 160 from scratching and damaging the inner wall of the piston sleeve 100 during the movement of the piston 120 along the piston chamber 110.

[0028] The embodiment of the present application provides a variable stiffness seismic isolation and shock absorbing limit damper which uses a piston sleeve 100 and a piston rod 130 connected respectively by a first spherical hinge support 220 and a second spherical hinge support 230, which solves the problem of instability caused by excessive movement of the building during an earthquake, is beneficial to the stability of the overall structure of the building, solves the problem of the building being subjected to multi-directional forces due to the earthquake, and can form high-frequency damping to reduce damage to the building. At the same time, the variable damping force generated by the retractable and expandable extrusion push petal 160 is used to solve the problem of the transmission of seismic energy to the upper structure, so that the piston 120 reduces or isolates the seismic force in the horizontal direction, ensuring 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.

[0029] Example 2 like Figure 3 and Figure 4 As shown, the embodiment of the present application provides a variable stiffness seismic isolation, shock absorbing and limit damper, which has roughly the same structure as the variable stiffness seismic isolation, shock absorbing and limit damper provided in Example 1, with the difference being that, in the present embodiment, one end of the piston 120 facing the variable diameter cavity 150 is connected to a coaxially arranged axial damping rod 170, the outer wall of the axial damping rod 170 is provided with an annular damping groove 200 extending along its circumference, the damping groove 200 is sleeved with a damping friction ring 180 rotatable around the axis of the axial damping rod 170, each extrusion push petal 160 is hinged to the damping friction ring 180 through a traction rod 190; when each extrusion push petal 160 rotates synchronously along the direction approaching 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 reciprocate; two annular buffer rubber rings 210 are also provided in the damping groove 200, and the two ends of the damping friction ring 180 respectively press against the two buffer rubber rings 210.

[0030] The variable stiffness seismic isolation and shock absorbing limit damper provided in the embodiment of the present application is provided with an axial damping rod 170 extending along the axial direction and arranged coaxially thereof and connected to one end of the piston 120 facing the variable diameter cavity 150. A damping friction ring 180 is slidably sleeved on the axial damping rod 170. Each extrusion push petal 160 is hinged to the damping friction ring 180 through a traction rod 190. When each extrusion push petal 160 rotates synchronously along the direction approaching or away from the axis of the piston sleeve 100, each traction rod 190 is simultaneously driven to move and pull the damping friction ring 180 to rotate reciprocatingly, so that the radial damping force of each extrusion push petal 160 rotating synchronously along the direction approaching or away from the axis of the piston sleeve 100 is converted into a rotational friction force between the damping friction ring 180 and the axial damping rod 170 through each traction rod 190, thereby realizing the conversion and transmission of the damping force, thereby effectively improving the damping force of the variable stiffness seismic isolation and shock absorbing limit damper to improve the seismic isolation and shock absorbing capability.

[0031] The outer wall of the axial damping rod 170 is provided with an annular damping groove 200 extending along its circumference. The damping friction ring 180 is slidably arranged in the damping groove 200. The damping groove 200 can be used to limit the position of the damping friction ring 180 to ensure that the damping force is stably converted from the radial rotation of the extrusion push petal 160 to the circumferential rotation of the damping friction ring 180; two annular buffer rubber rings 210 are also provided in the damping groove 200, and the two ends of the damping friction ring 180 are respectively pressed against the two buffer rubber rings 210. The two buffer rubber rings 210 can be used to further buffer and block the position of the damping friction ring 180, thereby avoiding wear between the two ends of the damping friction ring 180 and the damping groove 200 due to friction, thereby extending the service life of the damping friction ring 180.

[0032] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A variable stiffness seismic isolation and damping limit damper, comprising a piston sleeve with a piston cavity and a piston movably arranged in the piston sleeve, the piston is connected to a piston rod sliding through one end of the piston sleeve, and the end of the piston sleeve away from the piston rod is connected to a sleeve support rod, characterized in that: A variable diameter cavity is provided at one 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. A plurality of extrusion push petals arranged at intervals along its circumference are connected to one end of the piston facing the variable diameter cavity; when the piston moves along the variable diameter cavity, the inner wall of the variable diameter cavity synchronously pushes or stops pushing each of the extrusion push petals, so that each of the extrusion push petals synchronously rotates in a direction close to or away from the axis of the piston sleeve.

2. The variable stiffness isolation and vibration-absorbing limit damper according to claim 1, characterized in that: One end of the piston facing the variable diameter cavity is connected to an axial damping rod extending along its axial direction, and the axial damping rod is sleeved with a damping friction ring rotatable around its axis. Each of the extrusion push petals is hinged to the damping friction ring through a traction rod, and when each of the extrusion push petals rotates synchronously in a direction close to or away from the axis of the piston sleeve, it drives each of the traction rods to move and pull the damping friction ring to reciprocate.

3. The variable stiffness isolation and vibration-absorbing limit damper according to claim 2, characterized in that: The outer wall of the axial damping rod is provided with an annular damping groove extending along its circumference, and the damping friction ring is rotatably arranged in the damping groove.

4. The variable stiffness isolation and vibration-absorbing limit damper according to claim 3 is characterized in that: Two annular buffer rubber rings are arranged in the damping slide groove, and two ends of the damping friction ring respectively press against the two buffer rubber rings.

5. The variable stiffness isolation and vibration-absorbing limit damper according to claim 1, characterized in that: The cross section of the extrusion push petal is fan-shaped.

6. The variable stiffness isolation and vibration absorbing limit damper according to claim 1, characterized in that: The surface edge of the extrusion push petal that fits the variable diameter cavity is chamfered.

7. The variable stiffness isolation and vibration-absorbing limit damper according to claim 1, characterized in that: It also includes a first spherical hinge support and a second spherical hinge support respectively connected to the piston rod and the sleeve support rod.

8. The variable stiffness isolation and vibration-absorbing limit damper according to claim 7, characterized in that: The first spherical hinge support and the second spherical hinge support are respectively connected to the bracket through connecting bolts.

9. The variable stiffness isolation and vibration absorbing limit damper according to claim 1, characterized in that: The edge of the surface of the piston in contact with the piston chamber is chamfered.

10. The variable stiffness isolation and vibration absorbing limit damper according to claim 1, characterized in that: The inner wall of the variable diameter cavity is arc-shaped.

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