CN-122009462-A - Rubber choke rod device for inhibiting cavitation of gap of semi-suspension rudder

CN122009462ACN 122009462 ACN122009462 ACN 122009462ACN-122009462-A

Abstract

The invention belongs to the technical field of ship anti-cavitation structures, and particularly relates to a rubber choke rod device for inhibiting cavitation of a gap of a semi-suspension rudder. The rubber choke rod is arranged in an annular gap between the inner wall of a socket of the semi-suspension rudder blade and the outer wall of a pivot of the rudder horn, and comprises two rubber choke rods which are vertically arranged, two ends of the rubber choke rods are connected to the inner wall of the socket of the rudder blade and are symmetrical with respect to the longitudinal section of the rudder blade, and the outer surface of the rubber choke rods is tightly contacted with the inner wall of the socket and the pivot of the rudder horn. The invention uses flexible rubber choke rod as the choke device of core sealing element to directly replace the mechanical sealing mechanism relying on precise moving parts. The device utilizes the elastic deformation capability of the material per se through the rubber choke rod, and fills and seals the gap of dynamic change in a self-adaptive manner when the rudder blade rotates, so that cavitation conditions are eliminated from physical sources, and the device has excellent marine environment adaptability, extremely low maintenance requirement and good economical efficiency while ensuring the full-working-condition self-adaptive capability.

Inventors

YE JINMING
ZHANG XIANFENG
Wu Yuanrun
YANG WANLI
GAO YANG

Assignees

中国人民解放军海军工程大学

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (7)

1. A rubber flow blocking rod device for inhibiting cavitation of a clearance of a semi-suspension rudder is arranged in an annular clearance between the inner wall of a socket of the semi-suspension rudder blade and the outer wall of a pivot of a rudder horn, and is characterized by comprising two rubber flow blocking rods which are vertically arranged, are connected to the inner wall of the socket of the rudder blade at two ends and are symmetrical with respect to the longitudinal section in the rudder blade, and the outer surface of the rubber flow blocking rod is in tight contact with the inner wall of the socket and the pivot of the rudder horn.
2. The rubber spoiler device for inhibiting half-suspension rudder gap cavitation of claim 1, wherein the rubber spoiler has a shore hardness of a 50-a 80.
3. The device for restraining cavitation of a gap of a semi-suspension rudder according to claim 1, wherein the cross section of the rubber flow blocking rod is circular or elliptical, two ends of the rubber flow blocking rod are rotatably connected to the upper inner wall and the lower inner wall of the inner wall of a rudder blade socket, mounting cavities are correspondingly arranged on the upper inner wall and the lower inner wall of the rudder blade socket, and the rubber flow blocking rod is in rolling extrusion contact with a rudder horn pivot.
4. The rubber flow blocking rod device for inhibiting cavitation of a clearance of a semi-suspension rudder according to claim 3, wherein the rubber flow blocking rod comprises a connecting shaft in the center and a rubber layer arranged outside the connecting shaft, and two ends of the connecting shaft are inserted into corresponding mounting cavities on the inner walls of the upper side and the lower side of the inner wall of a rudder blade socket.
5. The rubber stopper rod device for suppressing cavitation of a clearances of a half suspension rudder of claim 4, wherein both ends of the connecting shaft are connected to a mounting cavity through a swivel bearing.
6. The device for restraining cavitation of a gap of a semi-suspension rudder according to claim 1, wherein the cross section of the rubber flow-resistant rod is circular or elliptical, two ends of the rubber flow-resistant rod are fixedly connected to the upper inner wall and the lower inner wall of the rudder blade socket, and the rubber flow-resistant rod is in sliding extrusion contact with the rudder horn pivot.
7. The rubber choke pole device for inhibiting cavitation of a clearances of a semi-suspension rudder according to claim 6, wherein the upper and lower sides of the inner wall of the rudder blade socket are provided with mounting grooves, and the end of the rubber choke pole is provided with an enlarged anchor head or embedded metal core bar and is embedded in the mounting grooves by a high-strength adhesive combined with a mechanical pressing plate.

Description

Rubber choke rod device for inhibiting cavitation of gap of semi-suspension rudder Technical Field The invention belongs to the technical field of ship anti-cavitation structures, and particularly relates to a rubber choke rod device for inhibiting cavitation of a gap of a semi-suspension rudder. Background The semi-suspended rudder is one of the main rudder types of modern ships. The rudder horn is hinged with the ship body, and the inherent mechanical connection structure forms an annular gap between the rudder horn pivot and the rudder blade socket. When the ship sails at medium and high speed, high-speed water flow passes through the narrow gap, so that local pressure is easily caused to drop below vaporization pressure, and serious gap cavitation phenomenon is caused. To cope with this problem, existing solutions have been developed mainly along two technical paths, one being traditional passive optimization, such as local geometric modification of the gap area. The method can only improve the local flow field environment, and the inhibition effect is only aimed at specific sailing working conditions, but the inherent cavitation source of the gap cannot be blocked or eliminated structurally. Secondly, the mechanical intervention thought is more active. For example, a follow-up mechanism comprising bearings, sleeves and multiple seals is used to dynamically seal off the gap. Although the scheme can be theoretically adapted to rudder angle change, the scheme relies on a bearing and sliding sealing mechanism with extremely high requirements on machining precision, lubrication and maintenance, and is easy to wear, clamping stagnation or sealing failure when the scheme is in a corrosive and dirty marine environment for a long time, and the reliability and the full life cycle economy of the scheme are obviously restricted. Therefore, in the prior art, both a simple passive protection mechanism and a complex active mechanism have obvious limitations, and the complex and changeable application scene is difficult to realize. Disclosure of Invention The invention aims to provide a novel scheme for realizing gap sealing from a physical source and preventing gap cavitation based on a physical flow blocking principle, which is used for effectively inhibiting the gap cavitation, prolonging the service life of a semi-suspension rudder and effectively reducing the fluid noise and vibration of the semi-suspension rudder in the use process. In order to achieve the above purpose, the present invention adopts the following technical scheme. A rubber flow blocking rod device for inhibiting cavitation of a clearance of a semi-suspension rudder is arranged in an annular clearance between the inner wall of a socket of the semi-suspension rudder blade and the outer wall of a pivot of a rudder horn, and comprises two rubber flow blocking rods which are vertically arranged, are connected to the inner wall of the socket of the rudder blade at two ends and are symmetrical with respect to the longitudinal section in the rudder blade, and the outer surface of the rubber flow blocking rod is tightly contacted with the inner wall of the socket and the pivot of the rudder horn. In a further improved or preferred embodiment of the rubber choke rod device for inhibiting cavitation of a gap of a half suspension rudder, the Shore hardness of the rubber choke rod is A50-A80. In a further improved or preferred embodiment of the rubber flow blocking rod device for inhibiting the cavitation of the clearance of the semi-suspension rudder, the cross section of the rubber flow blocking rod is circular or elliptical, two ends of the rubber flow blocking rod are rotatably connected to the upper inner wall and the lower inner wall of the rudder blade socket, the upper inner wall and the lower inner wall of the rudder blade socket are correspondingly provided with mounting cavities, and the rubber flow blocking rod is in rolling extrusion contact with the pivot of the rudder horn. In a further improved or preferred embodiment of the rubber flow blocking rod device for inhibiting cavitation of the clearance of the semi-suspension rudder, the rubber flow blocking rod comprises a connecting shaft in the center and a rubber layer arranged outside the connecting shaft, and two ends of the connecting shaft are inserted into corresponding mounting cavities on the inner walls of the upper side and the lower side of the inner wall of the rudder blade socket. In a further development or preferred embodiment of the aforementioned rubber spoiler device for suppressing cavitation of the clearances of the semi-suspension rudder, the two ends of the connecting shaft are connected to the mounting chamber by means of swivel bearings. In a further improved or preferred embodiment of the rubber flow blocking rod device for inhibiting the cavitation of the clearance of the semi-suspension rudder, the cross section of the rubber flow blocking rod is circular or elliptica