SU1525082A1 - Propeller shaft sealing - Google Patents

Abstract

This invention relates to shipbuilding. The purpose of the invention is to improve the reliability of the seal. The seal includes a housing 1 in which a ring-shaped element 2 is mounted. On the shaft 3 between the wall of the housing 1 and the inclined plane of the element 2 there is a sealing element 4. Inside the housing, cylindrical cups 5 of diamagnetic material with permanent magnets 6 are evenly along its diameter axially rare earth metal samari. On the element 2 opposite to the poles of the magnets 6 there are mounted plates-measles 7. On the opposite side of the element 2, a perforated plate 8 is fixed, placed between the hermetic electromagnetic contacts 9 and 10 and the permanent magnets 11 and 12. The contacts and magnets are fixed at a given distance in the casing 13 The pocket of the housing 1 is connected by a pipe 14 with a tank 15, which is equipped with a suction pump 16. When the element 4 is worn, the circuit closes and a signal appears on the control board indicating the state of the seal. 1 hp f-ly, 2 ill.

Description

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This invention relates to shipbuilding, in particular to propeller shaft seals.

The purpose of the invention is to improve the reliability of the seal.

FIG. 1 sec. Schematically depicts the seal of the propeller shaft, the cut; in fig. 2 is a circuit diagram in principle of a linear movement indicator of a ring-shaped element.

The body 1 is installed}) ring-shaped element 2, made of plastic, inert to sea water. The housing 1 and the annular element 2 are structurally made of two halves with a horizontal connector. A sealing element 4 is mounted on the shaft 3 between the wall of the housing 1 and the inclined plane of the annular element 2. In the inner vertical wall of the housing 1, cylindrical cups 5 of diamagnetic material are evenly but diametrically mounted; 1a. These magnets 6 are made of an alloy based on a rare-earth1) samari metal, facing gyu: 1us to the comic-shaped element 2. On the ring-shaped element 2 oppositely to the poles of the magnet 6, there are installed a corrosive plate 7 made of magnetic material.

On the opposite side of the ring-shaped element, a perforated plate 8 is fixed. Placed between hermetic electromagnetic contacts 9 and 10 and permanent magnets 11 and 12. Contacts and hardware are fixed at a predetermined distance in housing 13 fixed in housing 1.

The pocket of housing I is connected by pipeline 14 with a reservoir 15, which is equipped with a suction pump 16. The interfaced surfaces of housing 1 and the ring-shaped e, 1mena 2 have anti-friction coatings 17 and. The hermetic electromagnetic contacts are electrically connected to the signal table 10 19 at the control station of the ship installation.

Seal works as follows.

On the one hand, the sealing element 4 is acted upon by the hydraulic pressure: 1 of water depending on the draft of the vessel. On the opposite side, a force is transmitted to it from the inclined plane of the annular element 2, which is formed due to the magnetic interaction between the poles of the permanent magnets 6 and the slider plate 7. Minor leaks are diverted from the pocket of the housing 1

through the pipeline 14 into the tank 15, and removed from it by the pump 16. When the seal is worn to a predetermined value, the ring-shaped element 2 moves together

with the plate 8. In this case, the perforation in the plate 8 is in a position between the hermetic electromagnetic contact 10 and the permanent magnet 12, as a result of which an electrical circuit is closed and a signal appears on the display - it lights up

signal lamp.

With further wear of the seal to a predetermined limit value, the perforations in the plate 8 are in a position between the hermetic electromagnetic contact 9 and the permanent magnet 11, the electrical circuit closes again, and a secondary signal appears on the seal status.

20

Claims (2)

1. Sealing the propeller shaft, comprising a housing with an annular element mounted therein, enclosing the propeller shaft, a sealing element mounted 5 on the propeller shaft between the seal casing and the internal inclined sock of a ring-shaped electric tank, and the pressure device, O 1.1ch 11 1sh-ec 10 m. that, in order to increase the packing performance, it is fitted with an anti-friction butt cover, 0 mounted on the mating surfaces of the housing and the annular element, and the pointer of the linear displacement of the latter, the pressure device being made in the form of permanent magnets installed in cylindrical glasses made of 5 diamagnetic material, mounted axially inside the seal housing and turned with poles to the ring-shaped element, and the latter is equipped with plates made of magnetically soft material facing opposite to the poles of the magnets, while the housing and the ring-shaped element are fitted with a horizontal connector. 2. Sealing according to claim 1, characterized in that the linear movement indicator is provided with a casing fixed in the seal housing, electromagnetic contacts, additional permanent magnets and a perforated plate placed between the contacts and the magnets, with the additional permanent magnets and contacts fixed to specified distance 0 counter to each other and installed in the casing, and the perforated plate is mounted on the annular element. /but t wj3  Un Figure 2