CN220535888U - Resettable inertial device of mooring system - Google Patents

Abstract

The utility model provides a resettable inertial device of a mooring system. The utility model comprises an outer shell and a damping device arranged in the outer shell, wherein the damping device comprises a damper, an inertial element, a combined disc spring and a central spring rod, the central spring rod is arranged in the outer shell, the central spring rod is arranged in parallel with the damper, two ends after parallel connection are respectively connected with the bottom of an upper cable connecting device and the inertial element, the inertial element is connected with the top of a lower cable connecting device, a plurality of combined disc springs are sequentially and tightly sleeved on the central spring rod, and the upper cable connecting device and the lower cable connecting device are connected with a mooring cable. Compared with the existing common damping equipment such as heave plates or pontoons arranged at the bottom, the inertial-to-hold damper has smaller volume and simpler structure, and is suitable for small ocean platforms such as floating fans.

Description

A resettable inertia device for mooring systems

Technical field

The utility model relates to the technical field of mooring systems, and in particular to a resettable inertia device of a mooring system.

Background technique

Cable failure is a common accident that may occur when floating offshore platforms encounter harsh sea conditions. For platforms undergoing oil and gas exploration, once the cable fails, the platform will lose control and may drift and cause damage to the wellhead, resulting in oil leakage or natural gas and other serious environmental problems. At present, in order to reduce the risk of cable failure, the commonly used method is to reduce the motion response of the platform by setting up buoys and heave plates, thereby reducing the cable tension. However, these devices are larger and less effective. At the same time, most of the existing damping equipment does not take into account the impact of the mooring cables connected to the offshore platform. When the cables are subject to impact tension, the mooring system is prone to failure, thus affecting the operational safety of the platform. Therefore, existing devices have many limitations in their scope of use and effects. Existing units cannot be easily replaced. At the same time, because the existing floating platform vibration damping device is too large, the resistance in the water is too large, which increases the stress on the platform and mooring cables.

Utility model content

According to the technical problems raised above, a mooring system resettable inertia device is provided, which can absorb cable tension and can automatically recover after the tension disappears. This device is smaller and more effective in reducing the risk of cable failure than traditional methods. The technical means adopted by this utility model are as follows:

A resettable inertia device for a mooring system includes an outer shell and a damping device arranged inside the outer shell. The damping device includes a damper, an inertial element, a combined disc spring and a central spring rod. The central spring rod is arranged in the outer shell. The central spring rod is arranged in parallel with the damper. The two ends after parallel connection are respectively connected to the bottom of the upper cable connection device and the inertial element. The inertial element is connected to the top of the lower cable connection device. Connected, a number of combined disc springs are tightly connected to the central spring rod in sequence, and the upper cable connecting device and the lower cable connecting device are both connected to the mooring line.

Further, the combined disc spring includes a spring plate and an arcuate friction energy-dissipating plate, the upper cable connection device is connected to the spring plate of the uppermost combined disc spring, and the inertial element is connected to the spring plate of the lowermost combined disc spring.

Further, the outer shell is a flexible protective shell.

This utility model has the following advantages:

This utility model can effectively reduce the impact tension of the offshore platform mooring device when encountering sudden wind and waves. Compared with the existing common damping equipment such as heave plates or pontoons at the bottom, this inertia damper has a smaller volume. The structure is simpler and suitable for small offshore platforms such as floating wind turbines. It can simultaneously reduce the impact tension of the cable and the motion response of the platform, thereby effectively reducing and avoiding the occurrence of cable breakage and failure. If the damping device is worn, you only need to replace the inertia damper and you can continue to use the offshore platform, which is very convenient. This utility model designs a new type of inertia damper device suitable for mooring cables in order to solve the problem of cable failure of offshore platforms, which can better adapt to the marine environment and ensure safe operation of the offshore platform.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a schematic cross-sectional structural diagram of the utility model.

Figure 2 is a schematic diagram of the installation position of the utility model.

Figure 3 is a composition diagram of the inertial element in the embodiment of the present utility model.

In the figure, 1: damper, 2: flexible protective shell, 3: inertia element, 4: arcuate friction energy dissipation plate, 5: spring plate, 6: central spring rod; 7: ocean platform, 8: sea surface, 9: Inertia damper, 10: mooring line; 11, rack; 12, pinion; 13, large gear; 14, flywheel.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the description The embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

As shown in Figures 1 and 2, an embodiment of the present invention discloses a resettable inertia device for a mooring system, which includes an outer shell and a damping device arranged inside the outer shell. The damping device includes a damping device. Device 1, inertial element 3, combined disc spring and central spring rod 6. The central spring rod is arranged in the outer shell. The central spring rod is arranged in parallel with the damper. The two ends after parallel connection (i.e. the left end in Figure 1 and the right end) are respectively connected to the bottom of the upper cable connecting device and the inertial element. The inertial element is connected to the top of the lower cable connecting device. Several combined disc springs are tightly connected to the central spring rod in turn. The upper cable The connecting device and the lower cable connecting device are both connected to the mooring line.

In this embodiment, the combined disc spring and damper are connected in parallel to form a complete energy dissipation structure. When the external load is transmitted to the parallel structure, the combined disc spring and damper are subject to the same external force at the same time, and can eliminate part of the external force at the same time. After the external force disappears, the restoring force of the damper and combined disc spring can also assist the entire device and external structure to reset. The inertial element has the functions of inertial adjustment and energy transfer, and conducts external force to the parallel energy dissipation device.

Further, the combined disc spring includes a spring plate 5 and an arcuate friction energy dissipation plate 4. The upper cable connection device is connected to the spring plate of the uppermost combined disc spring, and the inertial element is connected to the spring plate of the lowermost combined disc spring. . There is an arcuate friction energy-dissipating plate arranged back-to-back between the two spring plates. The two arcuate friction energy-dissipating plates form a group. There are spring plates between adjacent groups of arcuate friction energy-dissipating plates. The preset settings are based on the calculation and design requirements. Assume the number of arcuate friction energy-dissipating plates and spring plates.

Further, the outer shell is a flexible protective shell 2 .

As an optional implementation, as shown in Figure 3, the inertia element is a rack-and-pinion type inertia, that is, through the meshing transmission of the rack 11, the pinion 12 and the large gear 13, the flywheel 14 is driven to rotate to achieve energy. Transfer Purpose.

During the assembly process, first, weld the spring plate to the central spring rod, preload the arcuate friction energy dissipation plate, and connect it in series to the center spring rod. The arcuate friction energy dissipation plate and the spring plate will never slip. The structure can be used during assembly. Glue, connect the remaining arcuate friction energy-dissipating plates in series; the damper is connected in parallel with the arcuate friction energy-dissipating plates and spring plates and then connected in series with the inertia original element. Both ends of the inertia-capacity damper are connected to the mooring cables, and an inertia-capacity damper is mounted on the outside. A layer of flexible protective sleeve is sealed to prevent seawater intrusion when the inertial volume damper is affected by external forces. Assembly is complete.

The floating ocean platform 7 floats on the sea surface 8, and a mooring cable 10 is connected below it. When in use, the inertia damper is placed on the side of the cable close to the floating ocean platform 7, and the upper and lower parts of the inertia damper 9 are connected to the mooring lines. When an impact phenomenon occurs on the mooring line, the cable will experience a large impact tension. At this time, the upper and lower cables will stretch each other, causing relative displacement at both ends of the inertia damper. The inertia damper generates a control force that acts on the upper and lower systems. When mooring the cable, the upper and lower friction plates of the disc spring are compressed, so that the disc spring device is compressed, which absorbs the impact tension and offsets most of the internal forces, thereby reducing the possibility of the structure being damaged under complex environmental loads. When the tension is reduced, the inertia The damper will automatically reset.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that : It is still possible to modify the technical solutions recorded in the foregoing embodiments, or to equivalently replace some or all of the technical features; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the embodiments of the present invention. Scope of technical solutions.

Claims (3)

1. The utility model provides a mooring system can restore to throne inertial appearance device, its characterized in that includes the outside casing and sets up the inside damping device of outside casing, damping device includes attenuator, inertial element, combination formula dish spring and center spring pole, center spring pole sets up in the outside casing, and center spring pole and attenuator parallel arrangement, the both ends after the parallel connection respectively with go up cable connecting device's bottom inertial element links to each other, inertial element links to each other with lower cable connecting device's top, and a plurality of combination formula dish springs closely cup joint in proper order on center spring pole, go up cable connecting device, lower cable connecting device all link to each other with the mooring rope.

2. A mooring system resettable inertial device according to claim 1, wherein the modular disc springs comprise spring plates and arcuate friction dissipative plates, the upper cable connection means being connected to the spring plates of the uppermost modular disc spring and the inertial member being connected to the spring plates of the lowermost modular disc spring.

3. A mooring system resettable inertial device according to claim 1, wherein the outer hull is a flexible protective hull.