Viscous fluid damper

Working Principle:

The viscous damper is made according to the principle of fluid motion, especially when the fluid through the throttle hole will produce viscous resistance, is a kind of stiffness, speed-related dampers. The piston is equipped with a damping structure and the cylinder is filled with fluid damping medium.

1.1 Hysteresis curve

F = C - va 
F = damping force 
C = damping coefficient 
V = velocity 
a = velocity dependent index
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  • Viscous fluid damper(VFD)

    Viscous damper: It is a kind of damper related to stiffness and speed, which is made according to the principle of fluid movement, especially when the fluid passes through the orifice, which will produce viscous resistance. Widely used in high-rise buildings, bridges, seismic reconstruction of building structures, industrial pipeline equipment vibration, military and other fields.

    The traditional anti-vibration (vibration) seismic performance of the structure itself (strength, stiffness, ductility) to resist earthquakes, wind, snow, tsunamis and other natural disasters. Due to the uncertainty of the intensity and characteristics of natural disasters, the structures designed by traditional anti-vibration methods do not have the ability to self-regulate. Therefore, when an earthquake occurs, it will often cause major economic losses and casualties.

    The development and application of viscous energy dissipation dampers are equivalent to installing "airbags" on buildings or bridges. When the earthquake comes, the damper absorbs and consumes the impact energy of the earthquake to the building structure to the maximum extent, and greatly alleviates the impact and damage to the building structure caused by the earthquake.

    JZN series viscous damper is a passive velocity-dependent damper designed and manufactured by applying the principle of damping force generated by the interaction of viscous medium and damper structural components. The medium used is silicone oil. The medium has a small viscosity-temperature coefficient, stable performance at extremely low and extremely high temperatures (-50°C~+250°C), and good radiation resistance. At the same time, it has excellent electrical insulation properties and excellent ozone resistance, corona resistance, hydrophobicity and moisture resistance.

    Mounting model of viscous damper:


    Installation Process:
    Installation steps: 
    1、Before installation, first check whether the installation nodes, installation dimensions, node plates, pins and dampers meet the design requirements of the drawings.
    2、For lighter dampers, first connect the dampers, node plates and pins together, and install the dampers in place by adjusting the fit of the node plates and the pre-built parts, using screw connections or welding. 
    3、For larger dampers, first connect the node plate with the pre-buried parts, and then insert the dampers into the middle of the node plate, and fix them through the pins. 
    4、For one end with flange connection, you can fix the flange end first, then align the pin hole and fix it by the pin.

    The viscous dampers provided by our company are maintenance-free products for life, in accordance with the requirements of JGJ297-2013 Technical Regulations for Energy Dissipation and Vibration Reduction in Buildings.
    1、 The inspection of viscous dampers can be divided into regular inspection and emergency inspection according to the inspection time and timing, and visual inspection and sampling inspection according to the inspection method.
    2、The viscous damper should be based on the design life and design documents requirements for regular inspection, under normal use in general 10 years or building maintenance should be carried out visual inspection, in the design life should be carried out when the sample inspection. Sampling inspection should be conducted after the earthquake, strong wind, fire and other disasters.
    3、Visual inspection of viscous dampers, should observe the appearance, deformation and other problems of the damper support, connection components, etc. and deal with them in a timely manner (see the attached table for details of the visual inspection). 
    4、Viscous damper sampling inspection, should be taken in the structure of the typical dampers in service, the basic performance of the in situ test or experimental test, the test content should be able to reflect the possible changes in performance parameters during the use of the damper, and should be able to presume whether to reach the predetermined service life.



    Typical installation of dampers:
    Construction without dampers  Damper inclined support Damper man support
    Damper lateral support Damper Shear Wall  Damper lasso type

Founded in 2016

Zhejiang Earthquake Prevention Technology Co., Ltd. is a holding subsidiary established by Hangzhou Diping Zhenan Technology Co., Ltd. in September 2020. Zhejiang Zhenfang Technology Co., Ltd. has a registered capital of 26 million yuan, its own factory building covers an area of 10,800 square meters, and the standard factory building area is 6,000 square meters. With the great help of the Institute of Engineering Mechanics of China Earthquake Administration, the company has established a technical team led by domestic experts in seismic reduction and isolation technology, which has laid a solid foundation for long-term development in the future.
Zhejiang Earthquake Prevention Technology Co., Ltd is a member of China Disaster Prevention Association. Famous Viscous fluid damper manufacturers and suppliers in China, we provide Viscous fluid damper for better Shock Absorption system.

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product ADVANTAGE

  • Friction damper

    It mainly includes the middle steel plate, the two outer steel plates and the friction material between the steel plates.

  • Simple mechanical model

    Simple and easy analysis and design of structural vibration reduction.

  • Simple structure and low cost

    Even large earthquakes are not damaged, so there is no need to replace.

  • Damping

    The hysteresis curve is basically rectangular.

  • Stable performance

    Velocity correlation, displacement correlation is small.

  • Good durability

    No post-maintenance required.

  • Energy absorption

    Vertical bearing capacity, horizontal restoring force, damping (energy absorption) trinity.

  • Damping ratio

    Improved rubber formula, the equivalent damping ratio can reach more than 12%.

  • Maintenance costs

    Low maintenance and management costs (no additional damping devices required).

  • Environmental friendly

    HDR high damping rubber has low temperature dependence and is widely used in different climatic regions.

  • Creep properties

    HDR high damping rubber has the same superior deformation performance as natural rubber.

  • Aging resistance

    The surface of the high damping bearing is covered with a rubber protective layer to protect the internal rubber from ozone and ultraviolet rays.

  • Viscous resistance

    It is a kind of damper related to stiffness and speed.

  • Widely used

    It is used in high-rise buildings, bridges, seismic reconstruction of building structures and other fields.

  • Airbag

    The damper absorbs and dissipates the impact energy of the earthquake on the building structure to the maximum extent.

  • Silicone oil medium

    The medium has a small viscosity temperature coefficient, and good radiation resistance.

  • Electrical insulation properties

  • Ozone resistance, corona resistance