A large-tonnage large-stroke unsealed viscous damper for controlling horizontal vibration

Abstract

The present application belongs to the field of vibration control technology, and discloses a large-tonnage large-stroke non-sealed viscous damper for controlling horizontal vibration, comprising a main box, a secondary box, a cable connecting member fixed pulley, a cable and a damping plate. The present application does not need strict and reliable sealing like traditional viscous dampers, and has simple structure, so that the processing difficulty and cost are greatly reduced. The damping liquid in the main box and the secondary box of the present application does not have leakage problem, and the damper failure problem caused by damping liquid leakage is avoided, so that the reliability and durability are greatly improved. Since the cable transmission is adopted, the economic advantage is extremely obvious for large-tonnage large-stroke occasions. The flow hole area can change with the damping liquid pressure difference, so that the stress of the damper and the structural member connector under extreme conditions is avoided, and the reliability and durability of the device are further improved.

Description

Technical Field

[0001] This invention belongs to the field of vibration control technology and relates to a large-tonnage, long-stroke, sealless viscous damper for controlling horizontal vibration. Background Technology

[0002] Viscous dampers are widely used in vibration control in fields such as construction engineering and machinery. Their basic principle is to absorb the system's energy by utilizing the shear effect of viscous fluid during flow. The core components of a traditional viscous damper typically include a sealed cylinder, a piston, and a damping fluid (usually high-viscosity silicone oil or hydraulic oil). When the structure vibrates, the piston reciprocates within the oil chamber, and the damping fluid flows through the piston orifices, generating viscous resistance and ultimately converting vibration energy into heat energy. This type of device has a simple appearance, a simple and reliable working principle, requires no complex control system, and has stable and efficient energy dissipation capabilities. The damping force it generates has a good linear relationship with the piston's movement speed. More precise damping control can be achieved by adjusting the fluid viscosity or changing structural parameters as needed, without the need for tuning.

[0003] However, traditional viscous dampers also have some significant drawbacks. First, these dampers typically rely on sophisticated sealing designs to prevent damping fluid leakage. This complex sealing structure not only significantly increases manufacturing costs but also makes the design and maintenance of the overall system extremely difficult. Second, over time, the seals are prone to wear and aging, potentially leading to oil leakage and a severe decline in damper performance, or even complete failure, resulting in high repair or replacement costs. Especially for large-tonnage (mega-Newton) and long-stroke (meter-level) viscous dampers, due to their extremely large output and displacement, the sealing requirements are extremely stringent, resulting in prices reaching hundreds of thousands or even millions of yuan.

[0004] To address the shortcomings of traditional viscous dampers, this invention proposes a large-tonnage, long-stroke, sealless viscous damper for controlling horizontal vibrations. This device eliminates the need for complex sealing structures, significantly reducing manufacturing difficulty, and can meet the application requirements of large tonnage and large displacement strokes. Therefore, the manufacturing cost is reduced by at least one order of magnitude. Summary of the Invention

[0005] This invention proposes a large-tonnage, long-stroke, sealless viscous damper for controlling horizontal vibrations, which is inexpensive, stable, and efficient. The large-tonnage, long-stroke, sealless viscous damper is installed between two structures and consists of a central main chamber and two auxiliary chambers on either side. The chambers are completely sealed and filled with damping fluid. The main and auxiliary chambers are interconnected via cable holes. The auxiliary chambers have cable holes at the top for connecting the damper to the structures via transmission cables. The chamber is fixed to the top surface of the first structure. One end of the cable is connected to a damping plate located inside the main chamber, and the other end first passes through the cable hole between the main and auxiliary chambers into the auxiliary chamber, then is deflected by a fixed pulley, and finally exits through the cable hole at the top of the auxiliary chamber. Finally, after being deflected by a fixed pulley, it is horizontally connected to a cable connector on the bottom surface of the second structure. When the two structures generate a significant longitudinal relative velocity, the second structure drives the cable to move. The damping plate inside the main chamber moves in the damping fluid under the traction of the cable, generating viscous resistance and consuming system energy, thus suppressing the relative motion between the two structures.

[0006] The technical solution of this invention: A large-tonnage, long-stroke, sealless viscous damper for controlling horizontal vibration has a symmetrical structure, including a main housing 1, auxiliary housing 2, a first cable hole 3, a second cable hole 4, damping fluid 5, cable connectors 6, a first fixed pulley 7, a second fixed pulley 8, a cable 9, and a damping plate 10. The first and second structures are spatially positioned vertically, with the main housing 1 and the two auxiliary housings 2 fixed as one unit. The auxiliary housings 2 are higher than the main housing 1. The main housing 1 and auxiliary housings 2 are sealed and filled with damping fluid 5. The entire unit is fixedly installed on the top surface of the first structure. A first cable hole is provided on the wall adjacent to the main housing 1 and auxiliary housing 2. Cable hole 3, the first cable hole 3 is located inside the auxiliary box 2; the top plate of the auxiliary box 2 is provided with a second cable hole 4; the cable connector 6 is fixedly installed on the bottom surface of the second structure above the main box 1; the first fixed pulley 7 is installed near the first cable hole 3, and the second fixed pulley 8 is installed near the second cable hole 4; in the static state, one end of the left and right cables 9 are respectively connected to the left and right sides of the damping plate 10 located inside the main box 1, and the other end of the left and right cables 9 passes through the first cable hole 3 and around the first fixed pulley 7, and then through the second cable hole 4 and around the second fixed pulley 8, and is connected to the cable connector 6.

[0007] The large-tonnage, long-stroke, sealless viscous damper also includes a flow hole 11. The damping plate 10 is provided with a flow hole 11. The area and shape of the flow hole 11 remain constant or change with the pressure difference between the two sides of the damping plate 10.

[0008] This large-tonnage, long-stroke, sealless viscous damper is placed horizontally or vertically at an angle to control relative horizontal or vertical tilting vibrations between structures.

[0009] The area of ​​the first cable hole 3 and the second cable hole 4 is larger than the area of ​​the cable 9, which allows the cable 9 to move freely in the holes without generating significant friction. In other words, the cable 9 does not need to be sealed at the first cable hole 3 and the second cable hole 4.

[0010] The damping plate 10 is tightly fitted to the inner wall of the main box 1 and has a certain thickness, so it will not overturn during movement.

[0011] The beneficial effects of the present invention are: (1) no sealing is required, thereby greatly reducing the structural complexity and manufacturing cost; (2) no damping fluid leakage will occur, and the durability and safety will be significantly improved; (3) due to the use of flexible high-strength cable transmission, the economic advantage is extremely obvious for large tonnage and long stroke applications; (4) the area of ​​the flow hole is not fixed, but changes with the pressure difference between the left and right sides of the damping plate, thereby avoiding excessive cable tension in extreme cases, thus better protecting the device and structure. Attached Figure Description

[0012] Figure 1 This is an elevation view of a large-tonnage, long-stroke, sealless viscous damper for controlling horizontal vibration, as proposed in this invention.

[0013] In the diagram: 1 Main box, 2 Auxiliary box, 3 First cable hole, 4 Second cable hole, 5 Damping fluid, 6 Cable connector, 7 First fixed pulley, 8 Second fixed pulley, 9 Cable, 10 Damping plate, 11 Flow hole. Detailed Implementation

[0014] The specific embodiments of the present invention will be described in detail below with reference to the technical solutions and accompanying drawings.

[0015] A large-tonnage, long-stroke, sealless viscous damper for controlling horizontal vibration includes: a main housing 1, an auxiliary housing 2, a first cable hole 3, a second cable hole 4, damping fluid 5, a cable connector 6, a first fixed pulley 7, a second fixed pulley 8, a cable 9, a damping plate 10, and a flow hole 11.

[0016] The main box 1 and the two auxiliary boxes 2 are integrally fixedly installed on the first structure; a first cable hole 3 is provided between the main box 1 and the auxiliary boxes 2; a second cable hole 4 is provided on the top plate of the auxiliary boxes 2; damping fluid 5 is filled inside the main box 1 and the auxiliary boxes 2; according to the principle of communicating vessels, if the main box 1 is filled with damping fluid 5, the liquid level in the auxiliary boxes 2 should be equal to or higher than the liquid level in the main box 1, therefore the height and liquid level of the auxiliary boxes 2 should be higher than the main box 1; the cable connector 6 is fixedly installed at a suitable position on the bottom surface of the second structure above the main box 1; a first fixed pulley 7 is installed near the first cable hole 3 inside the auxiliary box 2; a second fixed pulley 8 is installed near the second cable hole 4 on the top plate of the auxiliary box 2; in a static state, the left and right sides One end of the cable 9 is connected to the left and right sides of the damping plate 10, and the other end passes through the first cable hole 3, around the first fixed pulley 7, through the second cable hole 4, around the second fixed pulley 8, and finally connects to the cable connector 6. The areas of the first cable hole 3 and the second cable hole 4 are larger than the area of ​​the cable 9, which facilitates the free movement of the cable 9 within the holes and prevents significant friction. That is, the cable 9 does not need to be sealed at the first cable hole 3 and the second cable hole 4. The damping plate 10 is provided with a flow hole 11. The lengths of the left and right cables 9 can be pre-adjusted so that the initial position of the damping plate 10 during operation is located in the middle of the main box 1. After the damper is installed, the left and right cables 9 should not be in an excessively slack state. Based on the aforementioned vibration energy dissipation principle, the structural vibration is controlled.

[0017] Under dynamic load, when the second structure, together with the cable connector 6, moves to the right relative to the first structure, the end of the left cable 9 connected to the cable connector 6 moves to the right along with it. The left cable 9 tensions the damping plate 10, causing it to move to the left within the main housing 1. The right cable 9 is essentially relaxed, with its two ends moving to the right and left respectively with the cable connector 6 and the damping plate 10. Since the main housing 1 is filled with damping fluid 5, the pressure of the damping fluid 5 on the left side of the damping plate 10 is relatively higher than that on the right side. The tension of the left cable 9 is essentially the pressure difference between the left and right sides of the damping plate 10. Due to the high pressure, some of the damping fluid 5 on the left side of the damping plate 10 flows to the right side of the damping plate 10 through the flow hole 11, while another portion flows to the left auxiliary housing 2 through the gap between the left first cable hole 3 and the cable 9. Due to the obstruction of the damping fluid 5 inside the auxiliary box 2 and the box wall, the velocity of the damping fluid 5 flowing into the left auxiliary box 2 is quickly reduced, preventing it from being discharged outside the box through the second cable hole 4. During this process, the damping fluid 5 on the left side of the damping plate 10 inside the main box 1 generates resistance against the damping plate 10, preventing the second structure from moving to the right and doing negative work. The greater the relative velocity, the greater the tension of the cable 9. When the second structure, together with the cable connector 6, moves to the left relative to the first structure, the working principle is the same and will not be described again.

[0018] The large-tonnage, long-stroke, seal-free viscous damper of this invention does not require the structural complexity of traditional viscous dampers, which necessitate a strict seal at the first cable hole 3 to ensure that the damping fluid 5 can only flow through the flow hole 11. Therefore, the large-tonnage, long-stroke, seal-free viscous damper of this invention has a simple structure and will never suffer from the damper failure caused by poor sealing and damping fluid leakage, as is the case with traditional viscous dampers. Furthermore, this invention uses a flexible transmission component, cable 9, so the longitudinal dimensions of the two auxiliary boxes 2 can be much smaller than the longitudinal dimension of the main box 1. If a rigid push-pull rod similar to that of a traditional viscous damper were used, the longitudinal dimension of each auxiliary box 2 would be approximately equal to that of the main box 1, requiring a larger installation space and higher costs. Therefore, this invention has particularly significant advantages in long-stroke applications. Moreover, the cable 9 of this invention can be made of high-strength fiber material, requiring only 10 cm for mega-Newton-level tensile force. 2 The area required is sufficient to meet several times the safety factor requirement. Therefore, this invention has particularly significant advantages in high-tonnage applications. The device has a simple structure, low machining precision requirements, good durability, and low cost.

[0019] In practical engineering, considering that there may be a small amount of vertical relative displacement between the first structure and the second structure, the cable connector 6 can be an I-shaped structure to prevent the cable 9 from detaching from the cable connector 6; when the vertical relative displacement is large, the cable 9 can slide vertically on the cable connector 6.

[0020] The large-tonnage, long-stroke, sealless viscous damper of the present invention is not limited to applications where the first and second structures are in an up-down phase relationship in space; the left-right phase relationship can also be appropriately adjusted for applicability.

[0021] The main box 1 and the auxiliary box 2 are box-type structures with sufficient strength, rigidity and durability, and there are no restrictions on material type, size and construction form; The top of the auxiliary box 2 has a recessed top plate that allows the damping fluid 5 carried by the cable 9 to automatically flow back into the auxiliary box 2. The dimensions of the first cable hole 3 and the second cable hole 4 can be flexibly adjusted according to the size of the cable 9. The position, quantity and shape are not limited. Optionally, the second cable hole 4 can be simply sealed to prevent dust from falling into the auxiliary box 2. The damping fluid 5 can be high-viscosity silicone oil or other viscous fluids, taking into account its economy, applicability and durability, and the specific material is not limited; The cable connector 6 shall have sufficient strength, stiffness and durability, and there are no restrictions on the material type, size, quantity and construction form; The first fixed pulley 7 and the second fixed pulley 8 provide steering for the cable 9, and have sufficient strength, stiffness and durability. The material type, size, quantity and construction form are not limited. The aforementioned cable 9 has sufficient strength, stiffness, and durability, and its material type, size, quantity, and form are not limited; The damping plate 10 should fit as closely as possible to the wall of the main box 1, and have sufficient strength, rigidity, and thickness. The material type and structural form are not limited. The size and number of the flow holes 11 can be designed as needed; Optionally, the damping plate 10 may be provided with a certain number of flow holes 11 covered with a flexible membrane structure. The opening area of ​​the holes increases with the increase of the pressure difference caused by the increase of the movement speed of the damping plate 10, so as to avoid the excessive tension of the cable 9 and to protect the damper and the structure. The viscous damper, due to its structural form, can only be placed horizontally or slightly vertically tilted, and is used to control the relative horizontal or slight vertical tilting vibration between structures.

[0022] 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 large-tonnage, long-stroke, sealless viscous damper for controlling horizontal vibration, characterized in that, This large-tonnage, long-stroke, unsealed viscous damper has a symmetrical structure, including a main box (1), an auxiliary box (2), a first cable hole (3), a second cable hole (4), damping fluid (5), a cable connector (6), a first fixed pulley (7), a second fixed pulley (8), a cable (9), and a damping plate (10). The main box (1) is fixed to the two auxiliary boxes (2) on both sides, and the auxiliary boxes (2) are higher than the main box (1). The main box (1) and the auxiliary boxes (2) are sealed and filled with damping fluid (5). The whole assembly is fixedly installed on the top surface of the first structure. The first cable hole (3) is provided on the wall adjacent to the main box (1) and the auxiliary box (2). The first cable hole (3) is located in the auxiliary box. (2) Inside; the top plate of the auxiliary box (2) is provided with a second cable hole (4); the cable connector (6) is fixedly installed on the bottom surface of the second structure above the main box (1); the first fixed pulley (7) is installed near the first cable hole (3), and the second fixed pulley (8) is installed near the second cable hole (4); in the static state, one end of the left and right cables (9) is connected to the left and right sides of the damping plate (10) located in the main box (1), and the other end of the left and right cables (9) passes through the first cable hole (3) and around the first fixed pulley (7), and then passes through the second cable hole (4) and around the second fixed pulley (8), and is connected to the cable connector (6).

2. The large-tonnage, long-stroke, sealless viscous damper according to claim 1, characterized in that, The large-tonnage, long-stroke, sealless viscous damper also includes a flow hole (11). The damping plate (10) is provided with a flow hole (11). The area and shape of the flow hole (11) remain unchanged or change with the pressure difference on both sides of the damping plate (10).

3. The large-tonnage, long-stroke, sealless viscous damper according to claim 1, characterized in that, This large-tonnage, long-stroke, sealless viscous damper is placed horizontally or vertically at an angle to control relative horizontal or vertical tilting vibrations between structures.

4. The large-tonnage, long-stroke, sealless viscous damper according to claim 1, characterized in that, The cable connector (6) has an I-shaped structure to prevent the cable (9) from detaching from the cable connector (6); when the vertical relative displacement is large, the cable (9) slides vertically on the cable connector (6).

5. The large-tonnage, long-stroke, sealless viscous damper according to claim 1, characterized in that, The damping plate (10) fits tightly against the inner wall of the main box (1) and has a certain thickness, so it will not overturn during the movement.

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