Novel static-ring structure of mechanical sealing device

Abstract

The invention relates to a novel static-ring structure of a mechanical sealing device, which mainly solves the technical problems of improving lubricant conditions of primary and secondary seals and the like. The adopted technical scheme is that upper and lower working surfaces of upper and lower static-ring bodies of a split static-ring comprise upper and lower planes and upper and lower inclined planes; the upper and the lower planes are located at outer edges of the upper and the lower inclined planes; a group of upper and lower U-shaped flumes are arranged at the upper and the lower static-ring bodies along the circumferential direction; and the upper and the lower U-shaped flumes are located on the upper and the lower working surfaces and located at inner sides of the upper and the lower planes. The structure provided by the invention is suitable for the sealing of various marine stern tubes.

Description

Technical field: [0001] This invention relates to a seal between relatively moving surfaces, and more particularly to a stuffing box with rigid sealing rings. Background technique: [0002] The stern shaft of the ship extends through the stern of the hull, and a propeller is installed on the exposed end of the hull. The stern shaft is air inside the hull, and the stern shaft is submerged in seawater outside the hull. There is a marine stern tube sealing device, that is, a special mechanical sealing device for ships. On various types of ships, the structural schemes of the marine stern tube sealing device are various. The most recent and typical one is proposed by the British Deep Sea Sealing Co., Ltd. A marine stern tube sealing device, the sealing part of the device includes a static ring seat, an annular sealing strip, a static ring, a moving ring and a driving ring, wherein the split static ring is fixed on the static ring seat, and the static An annular sealing strip is...

AI Technical Summary

Problems solved by technology

[0003] 1. There is no good lubrication condition between the dynamic and static ring working surfaces (main seal pair) -- the main seal pair is immersed in seawater, and the infiltrated seawater is a good lubricant, but the structure of the main seal pair in the above technical solution is simple Planar contact, although technologies such as laser processing or composite method are used to improve the mechanical seal of the end face, still cannot meet the lubrication requirements of the marine stern tube sealing device, coupled with the presence of impurities such as mud and sand in sea water, the result is:

[0004] (1) The working surface of the main seal pair is severely worn;

[0005] (2) The heat generated by the main seal and auxiliary is extremely high

[0006] 2. The service life of the static ring is short. Due to the serious wear of the working surface of the static ring, the static ring made of soft material cannot maintain its sealing function under the pressure of the elastic element, or cannot restore its sealing performance after repeated repairs and is scrapped , usually the effective service life of the static ring is short;

[0007] 3. Low reliability and poor safety. In addition to the above-mentioned serious impact on seal reliability due to wear and tear, due to the poor lubrication conditions of the main seal pair, the frictional heat generated on the tightly pressed main seal pair cannot be dissipated. On the one hand, it may make the soft static Under high heat conditions, the ring will increase its wear or even lose its sealing function. On the other hand, high temperature will also damage the moving ring or other related components or cause the stern tube sealing device to fail and endanger the safety of the equipment;

[0008] 4. The production and use costs are high, and the main sealing pair has a large working area. In order to ensure its sealing performance, high-tech finishing is required, which greatly increases the production cost of the product. At the same time, the main sealing pair is severely worn and generates a large amount of heat And other factors will increase the expenditure of maintenance funds, thereby increasing the cost of use

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