A gap viscous damper

Abstract

The present application relates to a kind of gap viscous damper, including cylinder, it is defined with the inner chamber of accommodating damping medium in cylinder;Fixedly connected on the connecting barrel of the cylinder;Piston rod, the first end of the piston rod is located at the outside of the cylinder, second end airtightly passes through the cylinder and extends into the connecting barrel, and the piston of the piston rod is set in the inner chamber, the first gap is formed between the piston and the inner wall of cylinder.Said piston rod can move along the axial under the action of external force, drive piston relative to cylinder movement, so that damping medium can flow through the first gap, the axial movement of the piston rod produces damping effect. Wherein, still be provided with multiple limiting components in the piston, the limiting component can limit the radial movement of the piston rod and the stroke of piston, so as to avoid the piston and the inner wall of cylinder abut.

Description

Technical Field

[0001] This invention relates to an intermittent viscous damper. Background Technology

[0002] Viscous dampers are velocity-dependent energy-dissipating vibration reduction devices, widely used in military, aerospace, bridge, and high-rise building machinery fields, and have good vibration reduction effects.

[0003] The viscous damper is internally divided into two cavities by a piston, each filled with a high-viscosity damping medium. Under external load excitation, the piston reciprocates, forcing the high-viscosity silicone oil in one cavity to rapidly flow into the other cavity through a channel on the piston. This process generates local and friction losses, converting the externally input kinetic energy into the heat energy of the high-viscosity silicone oil, thereby reducing the structural seismic response. Intermittent viscous dampers have advantages such as simple structure, high reliability, and good economy, making them one of the most commonly used structural forms.

[0004] With the improvement of bridge design and construction standards, bridge structures are developing towards high flexibility and long spans. More and more super-long-span bridges are spanning valleys and bays, shortening the spatial and temporal distance between different regions and bringing convenience to people's travel. However, the larger the span of a bridge, the greater the deformation of its superstructure and substructure, and the greater the stroke of the viscous damper installed in it. With a large stroke viscous damper, the piston rod will also grow accordingly, making it prone to bending deformation under pressure, causing piston rod instability, and leading to problems such as friction and jamming between the piston and the inner wall of the cylinder. Summary of the Invention

[0005] To address the technical problems described above, this invention aims to provide an intermittent viscous damper. This intermittent viscous damper improves the stability of the piston rod while reducing the risk of friction and jamming between the piston and the cylinder wall.

[0006] According to the present invention, an intermittent viscous damper is provided, comprising a cylinder body defining an inner cavity for accommodating a damping medium; a connecting sleeve fixedly connected to the cylinder body; a piston rod having a first end located outside the cylinder body and a second end hermetically passing through the cylinder body and extending into the connecting sleeve; and a piston sleeved on the piston rod and located within the inner cavity, wherein a first gap is formed between the piston and the inner wall of the cylinder body.

[0007] The piston rod can move axially under the action of external force, driving the piston to move relative to the cylinder, so that the damping medium can flow through the first gap, thereby producing a damping effect on the axial movement of the piston rod.

[0008] The piston is also equipped with multiple limiting components, which can limit the radial movement of the piston rod and the piston, thereby preventing the piston from contacting the inner wall of the cylinder.

[0009] In a preferred embodiment, the limiting assembly includes a support rod configured to be inserted radially into the outer peripheral surface of the piston and having an extension extending out of the outer peripheral surface and abutting against the inner wall of the cylinder.

[0010] In a preferred embodiment, the limiting assembly further includes a limiting rod fixedly connected to the piston, and a groove is provided on the outer wall of the support rod. The limiting rod is inserted axially into the outer end face of the piston and passes through the groove.

[0011] A second gap is formed between the limiting rod and the slot in the radial direction, so that the limiting rod can move radially along the slot under the action of the piston. The size of the second gap is set to be smaller than the size of the first gap.

[0012] In a preferred embodiment, a groove is provided on the outer peripheral surface of the piston, and the support rod is disposed in the groove and is capable of moving radially within the groove.

[0013] An elastic element is provided between the lower end of the support rod and the bottom surface of the groove. The elastic element is configured to allow the support rod to contact the inner wall of the cylinder 10 when the piston rod is in its normal, undeformed state.

[0014] In a preferred embodiment, the elastic element is a polyurethane spring.

[0015] In a preferred embodiment, the support rods are provided in a plurality of positions, and the plurality of support rods are evenly distributed along the axial direction of the piston.

[0016] In a preferred embodiment, the limiting components are configured to be 3-6 in number, and the plurality of limiting components are evenly arranged along the circumference of the piston.

[0017] In a preferred embodiment, a baffle is also provided on the side of the limiting rod away from the piston.

[0018] In a preferred embodiment, a retaining ring is further provided on the piston rod, the retaining ring being fixedly sleeved on the piston rod and connected to the outer end face of the piston.

[0019] In a preferred embodiment, a fixed lug is provided at the end of the connecting cylinder away from the cylinder body, and a movable lug is provided at the end of the piston rod away from the cylinder body. Attached Figure Description

[0020] The present invention will now be described with reference to the accompanying drawings.

[0021] Figure 1 A schematic diagram of a gap-type viscous damper according to an embodiment of the present invention is shown.

[0022] Figure 2 for Figure 1 The image shows a bottom view of the limiting assembly of a gap-type viscous damper.

[0023] Figure 3 for Figure 1 The image shows a piston cross-sectional view of an intermittent viscous damper.

[0024] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0025] The invention will now be described with reference to the accompanying drawings.

[0026] Figure 1 A schematic diagram of a gap-type viscous damper 100 according to an embodiment of the present invention is shown. Figure 1 As shown, the intermittent viscous damper 100 includes a cylinder 10. An inner cavity 15 is defined within the cylinder 10, and the inner cavity 15 is filled with a damping fluid (not shown).

[0027] like Figure 1 As shown, a connecting cylinder 20 is fixedly connected to the first end 11 of the cylinder body 10. The connecting cylinder 20 can be, for example, cylindrical. Meanwhile, a piston rod 40 is provided at the second end 12 of the cylinder body 10. The first end 41 of the piston rod 40 is located on the outside of the cylinder body 10, and the second end 42 passes through the cylinder body 10 in a sealed manner and extends into the connecting cylinder 20, thereby forming a connection with the cylinder body 10.

[0028] In this invention, a fixed lug 23 is provided at the end of the connecting cylinder 20 away from the cylinder body 10. Simultaneously, a fixed lug 23 is also provided at the first end 42 of the piston rod 40 away from the cylinder body 10. Thus, the operator can connect the entire intermittent viscous damper 100 to a structure such as a bridge using the fixed lug 23 and the movable lug 43. Subsequently, when the bridge or other structure vibrates, it can drive the piston rod 40 to move axially relative to the cylinder body 10.

[0029] like Figure 1As shown, a piston 50 is also sleeved on the outer wall of the piston rod 40 at its axial center, and the piston 50 is disposed within the inner cavity 15. Meanwhile, the diameter of the piston 50 is set to be smaller than the width of the cylinder 10, so that an annular first gap 18 can be formed between the piston 50 and the cylinder 10 in the radial direction.

[0030] Therefore, when the piston rod 40 moves axially relative to the cylinder 10, it will drive the piston 50 to move relative to the damping fluid, so that the damping fluid flows through the piston 50 from the first gap 18, thereby damping the movement of the piston 50 and the piston rod 40.

[0031] During the movement of the piston rod 40, it may bend or move irregularly radially due to vibration or uneven force. This causes the piston 50 to move radially within the cylinder 10, thus abutting against and rubbing against the inner wall of the cylinder 10. This friction process not only affects the normal movement of the piston rod 40 but also causes wear or deformation of the piston 50, thus compromising the damping effect.

[0032] like Figure 1 As shown, a plurality of limiting components 60 are also provided inside the piston. The limiting components 60 can limit the radial movement of the piston rod 40 and the piston 50, thereby preventing the piston 50 from abutting against the inner wall of the cylinder 10.

[0033] Figure 2 for Figure 1 A schematic diagram of the limiting component 60 of the intermittent viscous damper 100 shown. Figure 2 As shown, the limiting assembly includes a rigid support rod 62. The support rod may be made of, for example, polytetrafluoroethylene (PTFE). The support rod 62 is configured to be inserted radially into the outer peripheral surface 51 of the piston 50 and has an extension 621 extending out of the piston 50. The extension 621 is configured to engage with the inner wall of the cylinder 10.

[0034] Therefore, when the piston rod 40 bends or vibrates, causing the piston rod 40 and piston 50 to move radially toward the inner wall of the cylinder 10, the extension 621 can form a rigid connection with the inner wall of the cylinder 10, thereby limiting the piston 50 in the radial direction and preventing the piston 50 from contacting the inner wall of the cylinder 10 and generating sliding friction, thus protecting the piston 50.

[0035] like Figure 2As shown, the limiting assembly 60 also includes a limiting rod 64. The limiting rod 64 is inserted axially into the outer end face 52 of the piston 50, thereby being fixedly connected to the piston 50. Meanwhile, a groove 624 is provided on the outer wall of the support rod 62, and the limiting rod 64 passes axially through the groove 624, thereby forming a connection with the support rod 62.

[0036] like Figure 2 As shown, the size of the slot 624 is set to be larger than the size of the limiting rod 64, thus forming a second gap 625 in the radial direction between the limiting rod 64 and the slot 624. Due to the existence of the second gap 625, when the piston rod 40 bends or vibrates, the piston 50 can move towards the inner wall of the cylinder 10 under the action of the piston rod 40. At this time, the piston 50 can drive the limiting rod 64 to move within the second gap 625 until the limiting rod 64 abuts against the side wall of the second gap 625.

[0037] Once the limiting rod 64 abuts against the side wall of the second gap 625, the limiting rod 64 can no longer move because the support rod 62 is fixed. At this time, the piston 50 can no longer move towards the inner wall of the cylinder 10.

[0038] The displacement of the piston 50 toward the inner wall of the cylinder 10 can be easily and immediately controlled by adjusting the size of the second gap 625. In this invention, the size of the second gap 625 is set to be smaller than the size of the first gap 18. Therefore, when the limiting rod 64 abuts against the side wall of the second gap 625, the piston 50 will still not come into contact with the inner wall of the cylinder 10.

[0039] This design allows the piston 50 to move a certain distance closer to the inner wall of the cylinder 10 without contacting it. In other words, it allows the piston rod 40 to bend or deform to a certain extent without affecting the operation of the damper 100. This prevents stress concentration in the piston rod 40 due to its inability to deform, which could lead to breakage and failure, thus affecting the normal operation of the damper 100.

[0040] like Figure 2 As shown, in a preferred embodiment, a groove 55 is provided on the outer peripheral surface 51 of the piston 50, and the support rod 62 is disposed within the groove 55 and is capable of radial movement within the groove 55. Simultaneously, an elastic element 552 is also provided between the support rod 62 and the groove 55.

[0041] In this invention, the elastic element 552 is configured to push the support rod 62 toward the inner wall of the cylinder 10 by its own elastic force when the piston rod 50 is in a normal, undeformed state, so that the support rod 62 is in contact with the inner wall of the cylinder 10.

[0042] Therefore, during the normal movement of the piston rod 40, when the inner wall of the cylinder 10 experiences slight bending due to machining errors or long-term use, resulting in a slightly irregular curved surface, the elastic element 552 can adjust the length of the support rod 62 extending from the piston 50 through its own elastic force, thereby achieving a floating connection between the support rod 62 and the inner wall of the cylinder 10. This design avoids the influence of deformation or machining tolerances of the inner wall of the cylinder 10 on the damper 100, preventing deformation from causing jamming and affecting the normal sliding of the support rod 62 on the inner wall of the cylinder 10.

[0043] In a preferred embodiment, the elastic element 552 is a polyurethane spring. This polyurethane spring not only has good elasticity but also good corrosion resistance, which can effectively reduce the corrosive damage of the damping fluid to the elastic element 552, thereby having a longer service life and stability.

[0044] like Figure 2 As shown, in this invention, multiple support rods 62 are provided, and the multiple support rods 62 are evenly distributed along the axial direction of the piston 50. Therefore, the limiting rod 64 can simultaneously pass through multiple support rods 62 to form a connection with them, thereby effectively improving the stability of the connection.

[0045] Figure 3 for Figure 1 The image shows a piston cross-sectional view of an intermittent viscous damper. Figure 3 As shown, the limiting components 60 are configured in numbers of 3 to 6, and these multiple limiting components are evenly arranged along the circumference of the piston 50. Field experiments demonstrate that setting the number of limiting components 60 within this range allows for a more stable limiting effect.

[0046] like Figure 1 As shown, in a preferred embodiment, a baffle 70 is further provided on the side of the limiting rod 64 away from the piston 50. When the limiting rod 64 moves axially away from the piston 50, it can abut against the baffle 70. Thus, the baffle 70 can limit the axial displacement of the limiting rod 64, preventing the limiting rod 64 from disengaging from the piston 50 due to axial movement in extreme cases, thus preventing the limiting assembly 60 from failing.

[0047] Furthermore, retaining rings 48 are respectively provided on the piston rods 40 on both sides of the piston 50. The retaining rings 48 are fixedly sleeved on the piston rods 40 and connected to the outer end faces 52 on both sides of the piston 50. Thus, the retaining rings 48 can further fix the axial connection between the piston rods 40 and the piston 50. Under the action of external force, the piston 50 and the piston rods 40 will undergo axial relative displacement, affecting the normal flow of the damping fluid.

[0048] The working process of an intermittent viscous damper 100 according to the present invention is briefly described below.

[0049] The present invention provides an intermittent viscous damper 100 for connection to bridges and other buildings, which has a vibration reduction effect on the buildings.

[0050] When a bridge or other structure vibrates, the piston rod 40 moves axially relative to the cylinder 10, and drives the piston 50 to move relative to the damping fluid. This causes the damping fluid to flow through the piston 50 from the first gap 18, thereby damping the movement of the piston 50 and the piston rod 40, and thus reducing the vibration of the bridge or other structure.

[0051] During this process, when the piston rod 40 vibrates or bends, causing it to move radially towards the inner wall of the cylinder 10, the piston 50 will move synchronously. At this time, the limiting rod 64 will move within the second gap 635 towards the inner wall of the cylinder 10 under the action of the piston 50, until the limiting rod 64 abuts against the inner wall of the second gap 635.

[0052] At this time, the support rod 62 will prevent the limiting rod 64 from continuing to move, thereby preventing the piston 50 from continuing to move towards the inner wall of the cylinder 10, thus preventing the piston 50 from forming contact with the inner wall of the cylinder 10, and further preventing the piston 50 from sliding and rubbing against the inner wall of the cylinder 10, causing the piston 50 and the damper 100 to jam.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. A gap-type viscous damper, comprising: A cylinder body, wherein an inner cavity is defined within the cylinder body to accommodate a damping medium; A connecting cylinder fixedly connected to the cylinder body; A piston rod, the first end of which is located outside the cylinder body, and the second end which passes through the cylinder body in a sealed manner and extends into the connecting cylinder, and, A piston, fitted onto the piston rod and located within the inner cavity, has a first gap between it and the inner wall of the cylinder. The piston rod can move axially under the action of external force, driving the piston to move relative to the cylinder, so that the damping medium can flow through the first gap, thereby producing a damping effect on the axial movement of the piston rod. The piston is further provided with multiple limiting components, which can limit the radial movement of the piston rod and the piston, thereby preventing the piston from abutting against the inner wall of the cylinder. The limiting assembly includes a support rod, which is configured to be inserted radially into the outer peripheral surface of the piston and has an extension extending out of the outer peripheral surface and abutting against the inner wall of the cylinder. The limiting assembly further includes a limiting rod fixedly connected to the piston, and a groove is provided on the outer wall of the support rod. The limiting rod is inserted axially into the outer end face of the piston and passes through the groove. A second gap is formed between the limiting rod and the slot in the radial direction, so that the limiting rod can move radially along the slot under the action of the piston. The size of the second gap is set to be smaller than the size of the first gap.

2. The intermittent viscous damper according to claim 1, characterized in that, A groove is provided on the outer circumferential surface of the piston, and the support rod is disposed within the groove and is capable of moving radially within the groove. An elastic element is provided between the lower end of the support rod and the bottom surface of the groove. The elastic element is configured to allow the support rod to contact the inner wall of the cylinder when the piston rod is in its normal, undeformed state.

3. The intermittent viscous damper according to claim 2, characterized in that, The elastic element is a polyurethane spring.

4. The intermittent viscous damper according to claim 3, characterized in that, The support rods are configured as a plurality of rods, which are evenly distributed along the axial direction of the piston.

5. A gap-type viscous damper according to any one of claims 1-4, characterized in that, The limiting components are configured to be 3-6 in number, and the multiple limiting components are evenly arranged along the circumference of the piston.

6. The intermittent viscous damper according to claim 2, characterized in that, A baffle is also provided on the side of the limiting rod away from the piston.

7. A gap-type viscous damper according to any one of claims 1-4, characterized in that, A retaining ring is also provided on the piston rod, which is fixedly sleeved on the piston rod and connected to the outer end face of the piston.

8. A gap-type viscous damper according to any one of claims 1-4, characterized in that, A fixed lug is provided at the end of the connecting cylinder away from the cylinder body, and a movable lug is provided at the end of the piston rod away from the cylinder body.

Images