Measuring structure of shaft rotating speed of ship propeller under internal and external pressure

Abstract

The invention relates to the field of marine propulsion, in particular to a measuring structure of the shaft rotating speed of a ship propeller under internal and external pressure. The measuring structure of the shaft rotating speed of the ship propeller under internal and external pressure comprises a closed cavity and a main shaft, wherein the closed cavity is composed of a bearing support andinternally provided with an annular contact type rotating speed sensor; and the main shaft penetrates through the annular contact type rotating speed sensor in a clearance fit mode, the main shaft isfurther connected with a set of bearing cavities, the bearing cavitiescompriseshaft sleeves, lip type seal rings, and bearings, O type seal ringsarearranged between the shaft sleeves and the main shaft,shaft couplings are furtherarranged at both ends of the main shaft, and a mechanical seal is connected with each inner sides of the shaft couplings. According to the measuring structure of the shaftrotating speed of the ship propeller under internal and external pressure,the measuring structure of the shaft rotating speedadopts the sealing designs of the mechanical seal, the O type seal, and the lip type seal and thus can bear bothpositivehydraulic pressure and negative hydraulic pressure, and the force and waterproof rating performance requirements of the high-precision rotating speed sensor are met.

Description

technical field

[0001] The invention relates to the field of ship propulsion, in particular to a shafting speed measurement structure of a ship propeller bearing internal and external pressure. Background technique

[0002] In order to test the rotational speed signal of the thruster of the vehicle under both pressurized and vacuumized states, it is necessary to arrange a test device that can withstand both positive and negative water pressures in the shafting test device.

[0003] For water-jet ships, the speed can be read by the frequency converter, but because the error of the speed signal of the frequency converter cannot meet the requirements of the test for the speed regulation of the propeller, the requirement for the acquisition signal of the speed of the propeller is one thousandth, so It is necessary to find a speed sensor with high precision and reliable signal acquisition. However, the existing speed sensor meets the requirements and has a low waterproof level. T...