Vortex-induced vibration suppression device with tail rotor rotatable separating disc and method
A vortex-induced vibration and suppression device technology, which is applied in the direction of pipes/pipe joints/fittings, mechanical equipment, pipe components, etc., can solve problems such as inability to deal with complex conditions in the deep sea, achieve corrosion and damage, prolong service life, slow down vortex The effect of exciting the vibration
Inactive Publication Date: 2013-12-18
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
However, these vortex-induced vibration suppression devices cannot cope with complex conditions in the deep sea, especially in real environments where the direction of water flow changes frequently
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[0028] According to the slenderness ratio of the actual riser and the perennial statistical information of local ocean waves and currents, design a reasonable basic unit spacing and the coverage of the basic unit on the riser, and calculate the required number of basic units n, that is, with a separation plate 2 The number of sleeves 1 is n, the number of fixed rings 3 is 2n, the number of balls 5 is 16n, the number of tail rotor 6 is 2n, the number of suspension rods 8 is 2n, and the number of nuts 9 The number is 2n.
[0029] When installing a single basic unit, first, set the sleeve 1 with the separation disc 2 on the riser at a suitable position; then, put the spherical ball 5 in the ball groove 10 of the fixed ring 3, and take two The fixing ring 3 is set on the riser from both sides, and fixed by bolts, and the upper and lower fixing rings 3 are docked with the end ring grooves 4 at both ends of the sleeve 1, and the balls 5 touch the arc of the end ring groove 4 Then, ...
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The invention discloses a vortex-induced vibration suppression device with a tail rotor rotatable separating disc and a method. The device is characterized in that the device comprises a plurality of basic units, wherein the basic units comprise a sleeve with a separating disc, fixing rings and tail rotors. A marine rise is sleeved with the sleeve with the separating disc; two ends of the sleeve with the separating disc are connected with the fixing rings, so that the axial motion of the sleeve is limited through the fixing rings; balls arranged in the fixing rings are matched with ring grooves at end parts of the sleeve, so that the free rotation of the sleeve is realized; the tail rotors are mounted at the tail part of the separating disc, and can ceaselessly rotate under the action of water flow. Vortex at the rear part of the marine riser can not be fully developed under the combined action of the separating disc and the tail rotors, and a vortex structure is quickly destroyed, so that vortex-induced vibration suppression is realized. As the main structure of the device is made of plastic, the cost is reduced, and the device is not easy to corrode and damage, can be reused, and can adapt to deep sea environment with frequently changed flow directions.
Description
technical field [0001] The invention belongs to the technical field of marine riser facilities laying, and in particular relates to a vortex-induced vibration suppression device and method with a rotatable separation disc with a tail rotor. Background technique [0002] With the increasing demand for oil, the exploitation of offshore oil and gas resources has gradually moved to the deep sea, and vigorously exploiting deep sea oil and gas resources has become an inevitable trend. The marine riser is an important part connecting the subsea wellhead and the upper platform, and provides a circulation channel for the drilling fluid. Due to the large slenderness ratio of the riser in deep sea operations, the structure presents obvious flexible characteristics. In the complex and alternating marine environment, the riser needs to bear the combined effects of various loads such as ocean currents and waves for a long time, especially when the ocean current and waves flow through the...
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IPC IPC(8): F16L55/045
Inventor 朱红钧赵洪南林元华冯光刘清友马粤韩青华潘倩
Owner SOUTHWEST PETROLEUM UNIV