An overload protection viscous damper for building seismic mitigation

Abstract

The utility model discloses an overload protection viscous damper for building shock absorption, including cylinder body, the end cover of the bolted installation of cylinder body one end opening position department, the piston rod of the sliding installation in the end cover inside and the front piston of fixed mounting of piston rod surface two ends respectively, the rear piston, the bushing of the cylinder body inside between the front piston, rear piston is integrally formed, the front medium cavity, rear medium cavity are provided with respectively in the cylinder body of the side of the front piston, rear piston far from each other, the utility model discloses respectively fixed a front piston, rear piston on the piston rod outer peripheral surface of bushing left and right sides, make the front piston, rear piston form the front medium cavity, rear medium cavity respectively in the damper cylinder body, and install the elastic protector for overload protection in rear medium cavity, thereby form the viscous damper of front and rear double cavity.

Description

Technical Field

[0001] This utility model relates to the field of damper technology, specifically to an overload protection viscous damper for building vibration reduction. Background Technology

[0002] Viscous dampers are widely used vibration reduction devices in building structures. Their main function is to dissipate vibration energy, reduce structural vibrations caused by earthquakes or other external forces, and thus improve the seismic performance and safety of buildings. Their core structure includes a damping unit (usually made of a high-viscosity viscous fluid or material), a piston, connectors, and sealing devices. The working principle is based on viscous damping, meaning the damping force is proportional to the relative velocity. When the structure is subjected to vibration, the piston in the damper moves under the action of the viscous fluid, generating resistance and converting vibration energy into heat energy. Due to its viscous characteristics, the damper can work effectively under different vibration intensities, especially exhibiting stronger energy dissipation capabilities during large vibrations. However, current dampers, in use, only have a single damping medium cavity inside the cylinder. This single-cavity design is relatively simple and lacks complex protective or buffering devices, making it difficult to cope with sudden overload conditions. Consequently, under sudden extreme conditions (such as earthquakes or mechanical shocks), the damper may withstand pressures exceeding its design limits, leading to seal failure, damping medium leakage, or even mechanical damage, endangering the overall structural safety. Utility Model Content

[0003] The purpose of this utility model is to provide an overload protection viscous damper for building vibration reduction. The piston rod extends out of the bushing, and a front piston and a rear piston are respectively fixed on the outer circumferential surface of the piston rod on the left and right sides of the bushing. The front piston and the rear piston form a front medium cavity and a rear medium cavity respectively inside the damper cylinder. An elastic protector for overload protection is installed in the rear medium cavity, thereby forming a viscous damper with front and rear cavities to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an overload protection viscous damper for building vibration reduction, comprising a cylinder, an end cap bolted to the opening at one end of the cylinder, a piston rod slidably installed inside the end cap, and a front piston and a rear piston fixedly installed at both ends of the piston rod surface, wherein a bushing is integrally formed inside the cylinder between the front piston and the rear piston, and a front medium cavity and a rear medium cavity are respectively provided inside the cylinder on the side of the front piston and the rear piston that are far apart, and an elastic protector is installed inside the rear medium cavity.

[0005] Preferably, a bellows is fixed between the end of the piston rod and one side of the outer wall of the end cap.

[0006] Preferably, a second one-way valve and a first one-way valve are respectively installed on one side of the end cap and the top of the cylinder. The second one-way valve is connected to the front medium chamber, and the first one-way valve is connected to the rear medium chamber.

[0007] Preferably, the cylinder body has a right-angle inlet channel connecting the rear medium chamber and the first one-way valve inside the end near the elastic protector.

[0008] Preferably, the elastic protector includes a T-shaped rubber seat installed inside the rear medium cavity and a shock-absorbing spring fitted on the outer circumference of the T-shaped rubber seat. The piston rod has an annular expansion tube integrally formed at one end near the T-shaped rubber seat, and the annular expansion tube has an inner concave portion. The rear medium cavity is connected to the right-angle liquid inlet channel through the T-shaped rubber seat.

[0009] Preferably, the T-shaped rubber seat has a cylindrical cavity connected to a right-angle liquid inlet channel inside, and straight grooves are provided on both the front and rear inner walls of the T-shaped rubber seat.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This overload protection viscous damper for building vibration reduction has a structure in which a cylinder, end cap, piston rod, bushing, front piston, front medium cavity, and rear piston cooperate with each other. The piston rod passes through the bushing, and a front piston and a rear piston are respectively fixed on the outer circumference of the piston rod on the left and right sides of the bushing. This makes the front piston and the rear piston form a front medium cavity and a rear medium cavity respectively inside the damper cylinder. An elastic protector for overload protection is installed in the rear medium cavity, thus forming a viscous damper with two cavities. By forming two independent medium cavities inside the cylinder, the damper can achieve multi-level damping under different working conditions, which can cope with both normal vibrations and... It can also provide stronger damping effect under extreme conditions, enhancing the energy dissipation capacity of the damper. This multi-cavity design makes the damper more adaptable to complex vibration environments and improves the overall stability of the structure. Secondly, the elastic protector installed in the rear medium cavity provides an effective overload protection mechanism for the damper. The elastic protector remains stable under normal operating pressure. Once the external force or vibration exceeds the preset limit, the elastic protector will buffer and disperse the overload pressure through deformation or elastic change, preventing damage to the internal structure of the damper, thereby enhancing the safety and reliability of the damper, avoiding seal failure, spring breakage or other mechanical damage caused by overload, and extending the service life of the damper. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the front cross-sectional structure of this utility model;

[0012] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0013] Figure 3This is a three-dimensional cross-sectional structural diagram of the present invention;

[0014] Figure 4 This is a three-dimensional structural diagram of the elastic protector of this utility model;

[0015] Figure 5 This is a three-dimensional cross-sectional structural diagram of the elastic protector of this utility model.

[0016] In the diagram: 1. Cylinder body; 101. Front medium chamber; 102. Right-angle inlet channel; 2. End cap; 3. Piston rod; 301. Annular expansion tube; 302. Inner recess; 4. Bellows; 5. Bushing; 6. Front piston; 7. Rear piston; 8. Rear medium chamber; 9. Elastic protector; 901. T-shaped rubber seat; 902. Shock-absorbing spring; 903. Column cavity; 904. Straight groove; 10. First check valve; 11. Second check valve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] Please see Figure 1-5 An embodiment of this utility model is provided: an overload protection viscous damper for building vibration reduction, including a cylinder 1, an end cap 2 bolted to the opening at one end of the cylinder 1, a piston rod 3 slidably installed inside the end cap 2, and a front piston 6 and a rear piston 7 respectively fixedly installed at both ends of the surface of the piston rod 3. A bushing 5 is integrally formed inside the cylinder 1 between the front piston 6 and the rear piston 7. A front medium cavity 101 and a rear medium cavity 8 are respectively provided inside the cylinder 1 on the side of the front piston 6 and the rear piston 7 that are far apart. An elastic protector 9 is installed inside the rear medium cavity 8.

[0019] A bellows 4 is fixed between the end of the piston rod 3 and one side outer wall of the end cap 2. The bellows 4 is used to connect the end of the piston rod 3 and the end cap 2, so that the piston rod 3 is in a sealed state, reducing the amount of external dust and other impurities adhering to the piston rod 3.

[0020] A second check valve 11 and a first check valve 10 are respectively installed on one side of the top of the end cap 2 and the cylinder body 1. The second check valve 11 is connected to the front medium chamber 101, and the first check valve 10 is connected to the rear medium chamber 8.

[0021] The cylinder body 1 has a right-angle inlet channel 102 that connects the rear medium chamber 8 and the first one-way valve 10 inside the end near the elastic protector 9. The operator can inject viscous medium into the rear medium chamber 8 and the front medium chamber 101 through the first one-way valve 10 and the second one-way valve 11 respectively to ensure that the viscous medium in the chamber is always in a sufficient quantity.

[0022] The elastic protector 9 includes a T-shaped rubber seat 901 installed inside the rear medium cavity 8 and a shock-absorbing spring 902 fitted on the outer circumference of the T-shaped rubber seat 901. The piston rod 3 has an annular expansion tube 301 integrally formed at one end near the T-shaped rubber seat 901, and the annular expansion tube 301 has an inner recess 302. When the piston rod 3 drives the rear piston 7 to move toward the elastic protector 9, the pressure of the viscous medium in the rear medium cavity 8 rises rapidly, generating a damping force. The annular expansion tube 301 will contact the shock-absorbing spring 902 on the outer circumference of the T-shaped rubber seat 901, and the shock-absorbing spring 902 will undergo elastic change to buffer and disperse the overload pressure.

[0023] When the piston rod 3 moves too much and the inner wall of the concave part 302 comes into contact with the end of the T-shaped rubber seat 901, the T-shaped rubber seat 901 will also deform. The elastic function of the T-shaped rubber seat 901 will be used to further alleviate the impact of the piston rod 3 and the rear piston 7 moving backward.

[0024] The rear medium chamber 8 is connected to the right-angle inlet channel 102 through the T-shaped rubber seat 901. The interior of the T-shaped rubber seat 901 is provided with a cylindrical cavity 903 that is connected to the right-angle inlet channel 102. Straight grooves 904 are provided on both the front and rear inner walls of the T-shaped rubber seat 901. When a viscous medium is injected into the rear medium chamber 8 through the first one-way valve 10, the viscous medium enters the rear medium chamber 8 through the right-angle inlet channel 102, the cylindrical cavity 903 and the straight grooves 904.

[0025] In this embodiment, when the vibration or impact force of the external building structure acts on the damper, the piston rod 3 is pushed or stretched by the external force. When the external force causes the piston rod 3 to move along the inner cavity of the cylinder 1, the positions of the front piston 6 and the rear piston 7 on the piston rod 3 within the cylinder 1 will change. Due to the presence of the bushing 5, the front piston 6, and the rear piston 7, the piston rod 3 is well guided and sealed during movement, ensuring that the damping medium does not leak in the front medium cavity 101 or the rear medium cavity 8, maintaining the stability of the cylinder. The front medium cavity 101 is filled with a viscous medium. When the piston rod 3, the front piston 6, and the rear piston 7 move forward, the front medium cavity 101... When the medium in chamber 01 is compressed, the pressure increases. At this time, the flow resistance of the viscous medium generates a damping force to resist the movement of the front piston 6, converting mechanical energy into heat energy within the viscous medium, thus playing a shock absorption and buffering role. That is, when vibration causes the piston rod 3 to move to one side, the pressure in the relevant cavity rises rapidly, the flow of the viscous medium is obstructed, generating a damping force to absorb vibration energy. When the vibration intensity is large or there is an impact overload, the elastic protector 9 installed in the rear medium cavity 8 has elastic deformation capability, which can buffer the sudden pressure rise during overload, avoid damage to the internal structure of the damper, and thus absorb some energy through deformation, slow down the sudden pressure change, and protect the integrity of the seals and internal structure.

Claims

1. An overload protection viscous damper for building vibration reduction, characterized in that: The cylinder includes a cylinder body (1), an end cap (2) bolted to the opening at one end of the cylinder body (1), a piston rod (3) slidably mounted inside the end cap (2), and a front piston (6) and a rear piston (7) fixedly mounted at both ends of the surface of the piston rod (3). A bushing (5) is integrally formed inside the cylinder body (1) between the front piston (6) and the rear piston (7). A front medium chamber (101) and a rear medium chamber (8) are respectively provided inside the cylinder body (1) on the side away from the front piston (6) and the rear piston (7). An elastic protector (9) is installed inside the rear medium chamber (8).

2. The overload protection viscous damper for building vibration reduction according to claim 1, characterized in that: A bellows (4) is fixed between the end of the piston rod (3) and one side of the outer wall of the end cap (2).

3. The overload protection viscous damper for building vibration reduction according to claim 1, characterized in that: A second one-way valve (11) and a first one-way valve (10) are respectively installed on one side of the top of the end cap (2) and the cylinder body (1). The second one-way valve (11) is connected to the front medium chamber (101), and the first one-way valve (10) is connected to the rear medium chamber (8).

4. The overload protection viscous damper for building vibration reduction according to claim 3, characterized in that: The cylinder body (1) has a right-angle inlet channel (102) that connects the rear medium chamber (8) and the first one-way valve (10) inside the end near the elastic protector (9).

5. The overload protection viscous damper for building vibration reduction according to claim 4, characterized in that: The elastic protector (9) includes a T-shaped rubber seat (901) installed inside the rear medium cavity (8) and a shock-absorbing spring (902) fitted on the outer circumference of the T-shaped rubber seat (901). The piston rod (3) has an annular expansion tube (301) integrally formed at one end near the T-shaped rubber seat (901), and the annular expansion tube (301) has an inner recess (302) inside. The rear medium cavity (8) is connected to the right-angle liquid inlet channel (102) through the T-shaped rubber seat (901).

6. The overload protection viscous damper for building vibration reduction according to claim 5, characterized in that: The T-shaped rubber seat (901) has a cylindrical cavity (903) that communicates with the right-angle liquid inlet channel (102) inside. The front and rear inner walls of the T-shaped rubber seat (901) are provided with straight grooves (904).

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