Dynamic seal structure of screw shaft of underwater pressure-bearing shell

A technology of dynamic sealing structure and pressure-bearing shell, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of the applicability of underwater pressure-bearing shells, etc., to reduce the contact area and achieve reliable sealing , the effect of increasing reliability

Inactive Publication Date: 2010-11-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These devices all solve one or several existing problems of dynamic sealing, but there are problems with the applicability of underwater pressure-bearing shells

Method used

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  • Dynamic seal structure of screw shaft of underwater pressure-bearing shell
  • Dynamic seal structure of screw shaft of underwater pressure-bearing shell

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specific Embodiment

[0019] As shown in the attached figure, it is an underwater pressure-bearing shell. The stern shaft is connected with the motor in the pressure-bearing shell through bearings and couplings, and the other end of the stern shaft is connected with the propeller through keys and couplings. It is required to install the sealing device. When the motor starts and the propeller works, the sealing system starts to work normally. After working for a period of time, it is found that there is a small amount of leakage on the dynamic sealing surface. At this time, there is no need to stop the machine. Use tools to gently tighten 45-90 degrees one by one according to the relative adjustment bolts, and work in this way in the future. When the tightening bolts cannot be further tightened, it means that the adjustable sealing seat has been adjusted to the limit position, and the sealing ring needs to be replaced if leakage occurs again.

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Abstract

The invention discloses a dynamic seal structure of a screw shaft of an underwater pressure-bearing shell. The external conical surface of the screw shaft and the internal conical surface of an adjustable seal seat with a stepped external side surface are in dynamic seal fit; a stuffing box tightening cap and a multi-ring stuffing box are successively installed on the small cylindrical surface of the screw shaft from inside to outside, and forms a seal surface with the inner hole of the underwater pressure-bearing shell through a stuffing box; the end surfaces of a large cylindrical surface and the underwater pressure-bearing shell can be connected by the adjustable bolt of the adjustable seal seat; and the stuffing box is adjusted and compressed by the stuffing box tightening cap positioned between the adjustable seal seat and the underwater pressure-bearing shell via a stuffing box compression bolt installed on the adjustable seal seat. The dynamic seal structure utilizes a conical surface structure and can adjust the axial distance of the seal seat, so that the compression force required by sealing can be reached on the seal surface and the sealing is more reliable. A plurality of sealing rings are utilized for line contact sealing, thus the defects of large seal contact area, larger required pressing force, big abrasion on shafts, quick abrasion of the stuffing box and large power loss of the traditional stuffing box are reduced and the service life of the seal structure is prolonged.

Description

technical field [0001] The invention relates to a sealing structure, in particular to a dynamic sealing structure for a stern shaft of an underwater pressure-bearing shell. Background technique [0002] Due to the moving parts on the sealing surface, the wear of the sealing elements is inevitable, so dynamic sealing has always been a relatively difficult technology. The traditional dynamic seal mainly includes stuffing box dynamic seal and mechanical dynamic seal. Time will be worn, plus the surface contact friction resistance is large, the sealing reliability is not high, the structure is simple, the cost is low, the service life of the sealing element is short, it is not suitable for toxic and harmful seals, because the sealing material needs to be replaced frequently, for The underwater structure is also not suitable; the mechanical seal is a kind of friction that converts the friction between the shaft and the sealing element into the friction between the two friction el...

Claims

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Application Information

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IPC IPC(8): F16J15/16
Inventor 郑传祥
Owner ZHEJIANG UNIV
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