Sealed bearings for marine underwater installations

Abstract

The invention discloses a sealing bearing for a ship underwater device. The sealing bearing comprises an outer bearing seat, and is characterized in that an inner bearing seat is arranged on the innerwall of the outer bearing seat, and a bearing bushing is arranged on the inner wall of the right side of the inner bearing seat; the bearing bushing is in interference fit with the inner bearing seat; a main sealing packing and a gland are arranged on the inner wall of the left side of the inner bearing seat, and the gland is connected to the main sealing packing in an abutting mode and fixedly connected to the inner bearing seat. According to the sealing bearing for the ship underwater device, the bearing capacity is greater, and pressing resistance is stronger; the structure is more compact, flexible and convenient, and disassembly and assembly are convenient; the sealing pressing amount and pressing force can be adjusted according to the needs, and sealing materials can be replaced without entering a dry dock; and an oil lubrication system is not required, and the sea water lubrication capacity is achieved.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a sealed bearing used for underwater devices of ships. Background technique [0002] The ship's underwater devices mainly include rudders, side thrust nozzle closing devices, etc. What these devices have in common is that there is a transmission shaft passing through the hull to drive the rudder blade or cover plate to complete the specified action. The transmission shaft passes through the hull through the bearing. Since the bearing is located underwater and bears a certain water pressure, the bearing needs to have two important functions: the first is to bear the load of the external environment on the transmission shaft; the second is to ensure that the shaft exit Sealing performance to prevent water from entering the interior of the hull. Compared with the side thrust nozzle closing device, the rudder has a certain difference in the bearing function, that is, the position whe...

AI Technical Summary

Problems solved by technology

This standard adopts J-shaped rubber sealing ring for sealing, the material of the bearing bush is bronze, the shaft and the bearing bush are lubricated with oil, and the sealing ring is fixed by the gland, and the pressing amount of the gland cannot be adjusted

In addition, the existing technology also includes the design of sealed bearings for marine underwater devices with reference to the chemical industry standards HG21537.7-1992 "Carbon Steel Stuffing Box" and HG 21537.8-1992 "Stainless Steel Stuffing Box". These two standards use soft packing as the seal material, a gland with adjustable compression force can be set, and the tightness of the sealing material can be adjusted by adjusting the compression amount. Oil lubrication is used between the sealing material and the shaft. Neither of these two standards is equipped with a special bearing bush, which cannot withstand radial Force, the designer needs to improve on the basis of the standard

[0004] Generally speaking, the sliding watertight lower rudder bearing of CB 790-87 has a simple structure, and the sealed bearings of other underwater devices designed on the basis of it have the advantage of strong bearing capacity, but there are also some significant deficiencies: (1) The pressure resistance capacity is low; (2) The rubber sealing ring is easy to age, and after aging and wear, there is no way to adjust the compression amount, and it is impossible to maintain the pressure resistance capacity by increasing the compression amount; (3) The structure is simple, and it cannot (4) There is a hidden danger of marine pollution caused by oil leakage in the oil lubrication system

But the disadvantages are: (1) The sealed bearings of these two standard designs have low load-bearing capacity and cannot well withstand the huge loads imposed on underwater devices by the ocean and ship environment; (2) The shaft is clamped inside by the concave shoulder The shaft sleeve on the shaft limits the axial movement of the shaft, but it causes trouble in disassembly; (3) also does not consider the problem of pollution to the marine environment due to the need for oil lubrication

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