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Stern tube seal system

a technology of face seals and stern tubes, applied in the field of mechanical face seals, can solve the problems of time-consuming and cost-intensive procedures, and achieve the effect of reducing the confronting area

Inactive Publication Date: 2016-10-20
MIDE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a seal system for a stern tube shaft that includes a stator ring and a rotor ring with wide and narrow sealing faces for sealing with each other. The stator ring includes a narrower sealing face made of metal, which tapers to narrower widths rearwardly to reduce the facing area of the stator sealing face as it wears. The rotor ring may also include a wider sealing face made of tungsten carbide coating on the metal rotor ring. The seal system may further include a spring assembly about the shaft biasing the sealing faces into engagement with each other, an inflatable seal or a fluid activated back-up seal. The technical effects of this seal system include improved sealing performance, reduced wear of the sealing faces, and increased safety during maintenance or emergency situations.

Problems solved by technology

In ships with only one inflatable seal, a second layer of protection is effected by having divers install a cofferdam on the ship underwater which is a costly and time consuming procedure.

Method used

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Embodiment Construction

[0023]Aside from the preferred embodiment or embodiments disclosed below, this invention is capable of other embodiments and of being practiced or being carried out in various ways. Thus, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of components set forth in the following description or illustrated in the drawings. If only one embodiment is described herein, the claims hereof are not to be limited to that embodiment. Moreover, the claims hereof are not to be read restrictively unless there is clear and convincing evidence manifesting a certain exclusion, restriction, or disclaimer.

[0024]FIG. 1 shows a new split design system 10 here disposed about rotating stern tube shaft 12 sealing it with respect to structure 14 to be coupled to a ship's mounting flange. All of the components of the stern tube seal system preferably include a spilt design where two halves of the structure, for example, are coupled...

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Abstract

A seal system includes a face seal rotor ring including a wide sealing face preferably made of tungsten carbide. The stator ring includes a narrower sealing face confronting the rotor ring wide sealing face. The stator ring sealing face is preferably made of polyamide-imide and tapers to narrower widths rearwardly.

Description

GOVERNMENT RIGHTS[0001]This invention was made with U.S. Government support under Contract No. N65540-13-C05005 awarded by the Navy. The Government may have certain rights in the subject invention.FIELD OF THE INVENTION[0002]The invention relates to mechanical face seals and, in one particular embodiment, a stern tube face seal system.BACKGROUND OF THE INVENTION[0003]A stern tube seal seals a propeller shaft with respect to the ship's stern structure. One existing design includes a silicon carbide stator mating with a silicon carbide rotor. Such seals have failed in service as a result of the brittle nature of these materials. Further, some prior art seals do not include any kind of a backup seal subsystem and were difficult to install and maintain since the prior art stern tube seal did not feature a split design.SUMMARY OF THE INVENTION[0004]Featured is a seal system for a shaft such as a stern tube shaft. A face seal stator ring is disposable about the shaft and a face seal rotor...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16J15/34F16J15/3204F16J15/54F16J15/00
CPCF16J15/3496F16J15/008F16J15/54F16J15/3204F16J15/3452F16J15/36F16J15/363B63H23/321B63H2023/327
Inventor CUTLER, ANDREWHANLY, STEPHENKLEPPER, STEVEN A.LUDLOW, CHRISTOPHERSPADAFORA, MARKVAN SCHOOR, MARTHINUS
Owner MIDE TECH