A viscous damper for controlling vertical vibrations

Abstract

This invention belongs to the field of vibration control technology and discloses a viscous damper for controlling vertical vibration. The viscous damper adopts a double-cylinder, unsealed structure. The two cylinders are connected by a connecting rod hole in the middle of the cylinder partition. One end of the connecting rod is rigidly connected to a piston inside the second cylinder, and the other end passes through the cylinder partition and the top plate of the first cylinder before connecting to a structure. The bottom of the second cylinder is connected to another structure. When the two structures generate a vertical relative velocity, the connecting rod drives the piston to move in the damping fluid of the second cylinder, generating viscous resistance and suppressing the relative motion of the two structures. This invention does not require strict sealing, has a simple structure, low manufacturing cost, and better durability. The damping coefficient can be dynamically adjusted as needed by the comb teeth or the gradually changing inner cavity of the cylinder, resulting in higher efficiency compared to traditional dampers. This invention can effectively control the vertical or slightly inclined relative motion between various large structures such as bridges, cables, building internal structures, and marine engineering projects caused by various dynamic loads.

Description

Technical Field

[0001] This invention belongs to the field of vibration control technology and relates to a viscous damper for controlling vertical vibration. Background Technology

[0002] In the field of structural vibration reduction, viscous dampers are widely used due to their stable energy dissipation capabilities. Traditional viscous dampers typically employ a closed structure, mainly consisting of a cylinder, piston assembly, and damping medium. External structural vibrations drive the connecting rod and piston of the damper to move relative to each other within the cylinder filled with damping medium, thereby generating damping force, dissipating the structural vibration energy, and achieving the purpose of vibration reduction.

[0003] However, traditional viscous dampers still have some shortcomings in practical engineering applications. First, to ensure the stability and reliability of the internal damping medium during long-term operation, a high-precision sealing system is required to constrain the damping medium. This is especially critical under conditions of heavy loads and long strokes, where the sealing requirements are extremely stringent, placing very high demands on the manufacturing process and significantly increasing manufacturing costs. Second, under alternating loads, problems such as wear and aging of sealing elements and damping fluid leakage inevitably occur, leading to device failure. This often happens after only a few years of use, far below its designed service life. Furthermore, the damping force of traditional viscous dampers is basically linearly related to the structure's velocity. Under large impact velocities, excessive instantaneous forces may be generated, causing damage to structural components and damper failure.

[0004] Therefore, it is necessary to develop viscous dampers with simpler manufacturing processes, lower manufacturing costs, better durability, and higher safety. Summary of the Invention

[0005] This invention proposes a viscous damper for controlling vertical vibration. The damper employs a double-cylinder, seal-free structure. The cylinders are filled with damping fluid, and the upper and lower cylinders are connected by a connecting rod hole in the middle of a partition. One end of the connecting rod is rigidly connected to a piston inside the lower cylinder, and the other end passes through the partition between the upper and lower cylinders and the top plate of the upper cylinder before connecting to the controlled structure. The bottom of the lower cylinder is connected to another structure via a connecting ring. When the two structures generate a significant vertical relative velocity, the connecting rod drives the piston to move in the damping fluid, generating viscous resistance and suppressing the relative motion between the two structures.

[0006] The technical solution of this invention: A viscous damper for controlling vertical vibration includes a first cylinder 1, a second cylinder 2, a cylinder partition 3, a connecting rod 4, a first connecting rod hole 5, a second connecting rod hole 6, a piston 7, a flow hole 8, flexible comb teeth 9, damping fluid 10, a baffle plate 11, a first connecting ring 12, and a second connecting ring 13. The first cylinder 1 and the second cylinder 2 above it are connected as one unit, with a cylinder partition 3 in the middle; the connecting rod 4 passes through the first connecting rod hole 5 on the top plate of the second cylinder 2 and the second connecting rod hole 6 on the cylinder partition 3 from top to bottom and is rigidly connected to the piston 7 in the first cylinder 1; the piston 7 is provided with a flow hole 8, and the flow hole 8 is provided with flexible comb teeth 9; the first cylinder 1 and the second cylinder 2 are filled with damping fluid 10; a baffle plate 11 is provided in the second cylinder 2, and the baffle plate 11 passes through the connecting rod 4; a first connecting ring 12 and a second connecting ring 13 are respectively provided at the bottom of the first cylinder 1 and the top of the connecting rod 4.

[0007] The first connecting ring 12 and the second connecting ring 13, which are collinear with the central axis of the connecting rod 4, ensure that the connecting rod 4 is subjected to tension and compression forces along its axis. When relative motion occurs between the first connecting ring 12 and the second connecting ring 13, causing the connecting rod 4 to move upward, the connecting rod 4 drives the piston 7 to move upward. Since the first cylinder 1 is filled with damping fluid 10, the pressure of the damping fluid 10 above the piston 7 is relatively high, and the tension of the connecting rod 4 is basically the pressure difference between the upper and lower parts of the piston 7. Due to the high pressure, most of the damping fluid 10 above the piston 7 flows downward at high speed through the flow hole 8 and the gap between the piston 7 and the side wall of the first cylinder 1. A small amount of damping fluid 10 flows into the second cylinder 2 through the gap between the second connecting rod hole 6 and the connecting rod 4. Due to the obstruction of the damping fluid 10 inside the second cylinder 2 and the baffle plate 11, the velocity of the damping fluid 10 flowing into the second cylinder 2 is quickly reduced, thereby preventing it from splashing out of the second cylinder 2 through the first connecting rod hole 5, i.e., there is no leakage problem of damping fluid 10. During this process, the damping fluid 10 above the piston 7 in the first cylinder 1 generates resistance against the piston 7, performing negative work and suppressing relative vibration. Due to the dual-cylinder structure, a small amount of damping fluid 10 is allowed to flow up and down between the second connecting rod holes 6, with easily controllable flow rate and velocity, and no leakage from the first connecting rod hole 5, thus ensuring its operational reliability. The working principle is the same when the connecting rod 4 moves downwards, and will not be described in detail here.

[0008] The gap between the connecting rod 4 and the first connecting rod hole 5 and the second connecting rod hole 6 is in the sub-millimeter range.

[0009] The axial clearance between the piston 7 and the first cylinder 1 can be set to a constant or a variable as needed.

[0010] The beneficial effects of the present invention are as follows: (1) Compared with the traditional viscous damper, the viscous damper adopts a double cylinder structure, which allows a small portion of the damping fluid to flow up and down in the tiny gap between the second connecting rod hole and the connecting rod. The flow rate and flow volume are controllable and there is no leakage. Therefore, there is no need to strictly seal the first connecting rod hole. The structure is simple, the manufacturing cost is low, and the durability is good. (2) Unlike the fixed damping coefficient of the traditional viscous damper, the present invention adopts a cylinder with a gradually changing cross section and flexible comb teeth, which allows the damping coefficient of the viscous damper to be dynamically adjusted as needed. Moreover, its parameter design is more flexible and reliable, the efficiency is higher, and the durability is better. (3) It can effectively control the vertical or slightly tilted relative motion between various large structures such as bridges, cables, building internal structures, and marine engineering caused by various dynamic loads such as wind, earthquakes, and vehicles. Therefore, it has diverse functions and a wide range of applications. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a viscous damper structure for controlling vertical vibration proposed in this invention; In the figure: 1 First cylinder block, 2 Second cylinder block, 3 Cylinder block partition, 4 Connecting rod, 5 First connecting rod bore, 6 Second connecting rod bore, 7 Piston, 8 Flow hole, 9 Flexible comb teeth, 10 Damping fluid, 11 Baffle plate, 12 First connecting ring, 13 Second connecting ring. Detailed Implementation

[0012] The specific embodiments of the present invention will be described in detail below with reference to the technical solutions and accompanying drawings.

[0013] A viscous damper for controlling vertical vibration includes a first cylinder 1, a second cylinder 2, a cylinder partition 3, a connecting rod 4, a first connecting rod hole 5, a second connecting rod hole 6, a piston 7, a flow hole 8, flexible comb teeth 9, damping fluid 10, a baffle plate 11, a first connecting ring 12, and a second connecting ring 13. The first cylinder 1 and the second cylinder 2 above it are connected as one unit, with a cylinder partition 3 in the middle; the connecting rod 4 passes through the first connecting rod hole 5 on the top plate of the second cylinder 2 and the second connecting rod hole 6 on the cylinder partition 3 from top to bottom and is rigidly connected to the piston 7 in the first cylinder 1; the gap between the connecting rod 4 and the first connecting rod hole 5 and the second connecting rod hole 6 is in the sub-millimeter level; the piston 7 is provided with a flow hole 8, and the flow hole 8 is provided with flexible comb teeth 9; the first cylinder 1 and the second cylinder 2 are filled with damping fluid 10; a baffle plate 11 is provided in the second cylinder 2, and the baffle plate 11 passes through the connecting rod 4; a first connecting ring 12 and a second connecting ring 13 are respectively provided at the bottom of the first cylinder 1 and the top of the connecting rod 4, and the first connecting ring 12 and the second connecting ring 13, which are collinear with the central axis of the connecting rod 4, ensure that the connecting rod 4 is subjected to tension and compression forces along its axis.

[0014] The structure of this invention eliminates the need for a strict seal between the connecting rod and the connecting rod hole, as is required in traditional viscous dampers to prevent damping fluid leakage. This significantly reduces manufacturing difficulty and cost, and eliminates the problem of damping fluid leakage leading to viscous damper failure. Furthermore, it offers superior durability and high reliability. Overall, the greater the output force and stroke, the more pronounced the advantages of this invention and the stronger its price competitiveness.

[0015] The first cylinder 1 and the second cylinder 2 are typically rigid tubular structures with equal cross-sections, possessing sufficient strength, rigidity, and durability. The material type, size, and construction form are not limited.

[0016] The cylinder block partition 3 is used to separate the first cylinder block 1 and the second cylinder block 2, and has sufficient strength, rigidity and durability; The connecting rod 4 is a single straight rod, but it can also be a double rod or multi-rod structure to improve its stability under pressure. It has sufficient strength, stiffness and durability, and there are no restrictions on material type, size and construction form.

[0017] The dimensions of the first connecting rod hole 5 and the second connecting rod hole 6 are flexibly adjustable according to the dimensions of the connecting rod 4, and their positions and shapes are not limited. The gaps between the first connecting rod hole 5, the second connecting rod hole 6 and the connecting rod 4 should be as small as possible, controlled at the sub-millimeter level. Optionally, the first connecting rod hole 5 can be simply sealed to prevent dust from falling into the second cylinder 2.

[0018] The piston 7 has a sufficient gap with the inner wall of the first cylinder 1, and has sufficient strength, rigidity, and thickness. The material type, size, and structural form are not limited.

[0019] The size, number, and location of the flow holes 8 are not limited and can be designed as needed.

[0020] The flexible comb teeth 9 are not limited in material, size, stiffness, quantity, or arrangement. The bending state of the flexible comb teeth 9 is changed according to the movement speed of the piston 7 and the pressure difference between the upper and lower parts of the flow hole 8, so as to dynamically adjust the effective area of ​​the flow hole 8 and ultimately adjust the damping coefficient of the viscous damper.

[0021] The damping fluid 10 can be high-viscosity silicone oil or other viscous fluids. Taking into account its economy, applicability and durability, the specific material type is not limited.

[0022] The baffle plate 11 is fixed inside the second cylinder 2 to prevent the damping fluid 10 from splashing from the gap between the second connecting rod hole 6 and the connecting rod 4 to the first connecting rod hole 5. The baffle plate 11 has sufficient strength, rigidity and durability, and the material type, size and construction form are not limited. The gap between the baffle plate 11 and the connecting rod 4 is in the sub-millimeter level. The baffle plate 11 can have holes in the area near the cylinder wall, and the shape, size and number of holes are not limited. If the damping fluid in the second cylinder 2 is deep enough, the baffle plate 11 can also be omitted.

[0023] The first connecting ring 12 and the second connecting ring 13 provide connection points for the viscous damper, and have sufficient strength, stiffness and durability, with no restrictions on material, size and construction form.

[0024] Optionally, the inner cavity of the first cylinder 1 can adopt a gradually changing cross-section, meaning the gap between the first cylinder 1 and the piston 7 can be gradually increased or decreased from the middle to both ends. This dynamically adjusts the effective through-hole area of ​​the piston 7 at different positions within the first cylinder 1, ultimately adjusting the damping coefficient of the viscous damper. The second cylinder 2 contains only the connecting rod 4 and no piston, therefore it is not limited to using a constant cross-section. The cross-sectional dimensions of the second cylinder 2 can be significantly smaller than those of the first cylinder, further reducing the overall volume of the viscous damper. The inner cavity of the second cylinder 2 can also adopt a gradually changing cross-section.

[0025] The viscous damper can be arranged vertically or with a slight vertical tilt to control relative vertical or slight tilt vibrations between structures.

[0026] The above description is merely a preferred embodiment of the present invention and should not be considered as any limitation thereof. Any equivalent changes, modifications, or improvements made by those skilled in the art to the above embodiments when utilizing the technical solutions of the present invention should be considered as falling within the protection scope of the present invention.

Claims

1. A viscous damper for controlling vertical vibrations, characterized by The viscous damper for controlling vertical vibration comprises a first cylinder (1), a second cylinder (2), a cylinder partition (3), a connecting rod (4), a first connecting rod hole (5), a second connecting rod hole (6), a piston (7), a flow-through hole (8), a flexible comb (9), damping liquid (10), a flow baffle (11), a first connecting ring (12) and a second connecting ring (13); the first cylinder (1) is connected with the second cylinder (2) above it as a whole, with the cylinder partition (3) in the middle; the connecting rod (4) passes through the first connecting rod hole (5) of the top plate of the second cylinder (2) and the second connecting rod hole (6) of the cylinder partition (3) from top to bottom, and is connected with the piston (7) in the first cylinder (1); the piston (7) is provided with the flow-through hole (8), and the flow-through hole (8) is provided with the flexible comb (9); the first cylinder (1) and the second cylinder (2) are filled with the damping liquid (10); the second cylinder (2) is provided with the flow baffle (11), and the flow baffle (11) passes through the connecting rod (4); the first connecting ring (12) and the second connecting ring (13) are arranged at the bottom of the first cylinder (1) and the top of the connecting rod (4) respectively, and the first connecting ring (12) and the second connecting ring (13) are collinear with the central axis of the connecting rod (4), so as to ensure that the connecting rod (4) is subjected to axial tension and compression.

2. The viscous damper for controlling vertical vibrations according to claim 1, wherein The gap between the connecting rod (4) and the first connecting rod hole (5) and the second connecting rod hole (6) is in the order of microns.

3. The viscous damper for controlling vertical vibrations according to claim 1, wherein The gap between the piston (7) and the first cylinder (1) in the axial direction is set as a constant or a variable according to requirements.

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