Multi-stage load reduction device

Abstract

The invention discloses a multi-stage load reduction device which comprises a cavitator, a load reduction fragile piece and a telescopic connecting pipe. The cavitator is of a cone structure; the telescopic connecting pipe comprises a cylinder and a circular pipe; the circular pipe is fixedly connected with the head of a navigation body; the cylinder is in sliding connection with the circular pipe; the cylinder and the circular pipe are fixed to keep the maximum length in the initial state, and load-reducing breakable parts are wrapped between the cavitator and the head of the navigation bodyand on the periphery of the cylinder and the circular pipe; an elastic part is arranged on the inner wall of the upper end of the circular pipe; the lower end of the cylinder is fixedly connected withthe cone-shaped body plane of the cavitator; and a groove matching the elastic part is formed in the upper end of the cylinder. According to the invention, the load borne by the head is lower, the force borne by a truncated cone-shaped breakable part is more uniform, the breaking energy absorption is more thorough, the truncated cone-shaped breakable part is connected with the gyro-type cavitatorfor underwater navigation, and the influence of outer cover fragments in the load reduction head cap on the navigation body is avoided.

Description

technical field [0001] The invention relates to a multi-stage load-reduction device, in particular to a gyro-type multi-stage load-reduction device, which is applied to reduce the impact load of a fluid when a high-speed navigation body enters water, and belongs to the field of ships and marine engineering. Background technique [0002] Water entry of structures, such as ship slamming, seaplane landing, and lifeboat entry, etc., is a complex process involving multi-phase flow, free liquid surface and multi-field coupling of dynamic boundaries. The action time is short and the parameters change drastically. Especially when the vehicle enters the water at high speed, it will encounter strong instantaneous impact pressure and overload, resulting in structural damage and failure of internal devices, resulting in irreparable losses. A reasonable way to solve this problem is to use a certain method to reduce the load level and limit it within a certain range, so that the high-spee...

AI Technical Summary

Problems solved by technology

However, the current load reduction device has the following disadvantages. The load reduction device is only suitable for entering the water at medium and low speeds, and is only used for a short time when it hits the water; when the outer cover is broken and separated, it is easy to cause scratches to the structure of the vehicle; For high-speed water entry above 100m / s, the load-reduction head cap cannot meet the load-reduction requirements

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