D-shaped fin for vibration reduction of tower

Abstract

The invention discloses a D-shaped fin for tower vibration reduction, which comprises spiral structure fins and connecting pieces, and the tops, the middle parts and the bottoms of every three spiral structure fins are respectively connected with one connecting piece to form the D-shaped fin with a spiral structure; the D-shaped fin structures are annularly welded on the tower outer thermal insulation layer at equal intervals through connecting pieces; seen from top to bottom, the three spiral structure fins in each D-shaped fin are arranged at an angle of 120 degrees. The device is suitable for engineering application, large-scale vortexes are broken into small-scale vortexes instead of destroying vortex shedding of a boundary layer of a tower, an original flowing state of fluid on the surface of the tower is destroyed, the fluid is forced to change an original vortex shedding mode, and then the vibration effect of the fluid on a tower body is restrained; the damping device has the characteristics of easiness in processing, easiness in installation, remarkable damping effect and easiness in popularization.

Description

technical field [0001] The invention relates to a vibration-reducing and anti-vibration device used in the fields of petroleum, chemical industry and pharmacy to withstand wind loads on a tower, in particular to an anti-vibration D-shaped fin for a tower. Background technique [0002] Tower container is one of the important equipments used in petrochemical and other industries, and it is the main place where gas-liquid, liquid-liquid two-phase mass transfer and energy exchange occur in various common unit operations. Various towers are generally relatively large in size and height, and most of them are installed and used in the open air. Therefore, in addition to their own loads, the towers also need to withstand frequent wind loads. In addition to the cases where towers are directly damaged and failed due to extreme windy weather, fatigue damage caused by cyclic stress on the tower body is more common under medium and low wind speeds. The vortex shedding naturally formed by...

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Problems solved by technology

In addition to the cases where the tower is directly damaged and failed due to extreme windy weather, fatigue damage caused by cyclic stress on the tower body under medium and low wind speeds is more common. However, the length-to-diameter ratio of the tower is generally large, and the tower vibrates due to the force at the height. The vibration of the structure further affects the shedding form of the vortex, and finally forms the flow-induced vibration phenomenon of the fluid-solid coupling between the wind and the tower body, and the shedding of the vortex When the frequency is close to the natural frequency of the tower itself, frequency locking will occur and cause large vibrations. Once the damage caused reaches the fatigue limit of the tower body, the equipment will fail partially or even as a whole

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