JPS6323429B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency water stop sealing device for a stern tube sealing device used in a water (or oil) lubricated bearing of a ship or the like.

Recently, the use of water-lubricated bearings in ship shaft systems, i.e. marine propulsion shaft water sealing devices, has been reconsidered due to their oil leakage prevention function and superior properties against wear of the propulsion shaft. The inventor also applied for a special patent application in 1983.
In No. 81342 (Japanese Unexamined Patent Publication No. 57-195968),
A sealing device that stops water by causing the annular mirror plate of the rotating side seal mechanism fixed to the outer periphery of the propulsion shaft to collide with the annular water stop ribbon body of the stationary side seal mechanism attached to the stern tube, and the stationary side seal. We offer a stern tube sealing device that has an emergency sealing device attached to the main body of the mechanism, but in the case of conventional emergency sealing devices, the bottom of the annular rubber tightens on the propulsion shaft during emergency use to shut off water. However, there were problems such as the lubricant water being squeezed out and the propulsion shaft seizing up, and to avoid this it was necessary to stop or reduce the rotation of the propulsion shaft.

The present invention was provided in order to solve this problem, and the emergency seal device is made of an annular rubber body, and has a groove with a roughly shaped cross section formed on its outer peripheral surface, and is fitted into the bottom of the groove at appropriate intervals. By forming a joint and inserting a pressing piece made of carbon or synthetic resin, and by attaching a lid with an air injection pipe to the groove mouth and pressurizing air into the groove, the groove bottom and pressing piece are moved around the outer periphery of the propulsion shaft. It is configured to press against the surface to prevent the above-mentioned trouble with the propulsion shaft due to the use of the emergency seal device.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a stern tube sealing device for a water-lubricated bearing, in which a rotating-side sealing mechanism 1 and a stationary-side sealing mechanism 2 are integrally provided inside the hull. The seal mechanism 1 includes a holder 4 fitted into the propulsion shaft 3.
An annular mirror plate 5 is fixed to the holding body 4, and a cone portion 4' having a split groove of the holding body 4 is fixed to the propulsion shaft 3 by tightening with a bolt 7 via a cone ring 6. 8 is an O-ring fitted between the propulsion shaft 3 and the holder 4. On the other hand, the sealing mechanism 2 is equipped with a rubber bearing 9 and is attached to the stern tube 1 attached to the hull 10.
a fixed-side sealing mechanism main body in which an emergency sealing device 13 is fitted to an intermediate flange 12 fixed to the end of the fixed-side sealing mechanism;
That is, the casing 14 is integrally attached with bolts or the like, and the water stop bellow 15 is fixed to the casing 14.
It consists of a lid body 16 fitted so as to be able to swing in the axial direction and radial direction of the propulsion shaft 3 via the lid body 16, and an annular water stop ribbon body 17 fitted to the lid body 16, and the annular water stop ribbon body 17 The end face and the annular mirror plate 5 collide,
The rotary side seal mechanism 1 and the stationary side seal mechanism 2 are in sliding contact with each other at this portion to block water. Further, the cylinder body 8 is screwed into screw holes extending through the flange portion of the lid body 16 in the axial direction at appropriate intervals, and a guide bar 19 erected in the axial direction on the outer peripheral edge of the casing 14 is loosely inserted. , a coil spring 20 is inserted into the guide bar 19 and interposed between the end surface of the cylinder body 18 and the casing 14, and the cylinder body 18 is rotated to advance and retreat, thereby adjusting the pressing force of the coil spring 20; The contact force between the annular water stop ribbon body 17 and the annular mirror plate 5 is adjusted. 14' is a cover that covers the vicinity of the seal portion.
The annular mirror plate 5 is two annular plates that fit into a fitting part 21 formed in the end face of the holder 4, and a spring pin 22 is driven into a mounting hole penetrating the annular mirror plate 5 and the holder 4. is fixed to the holding body 4. A water-stopping O-ring 23 is fitted between the side surface of the fitting portion of the holder 4 and the inner peripheral end surface of the annular mirror plate 5 to prevent water from leaking from this portion. One of the annular mirror plates 5 collides with the annular water stop ribbon body 17, and one of the annular mirror plates 5 is used as a liner and is a spare for replacement. Next, the annular water-stop ribbon body 17 is made by wrapping a ribbon tape made of cloth, tetrafluoride resin, or the like in a spiral layer or a ribbon tape having a sandwich-like configuration of two or more kinds, and wrapping a thread-like sealing material around the outer circumferential surface of the tape to form a flange. It is made into a shape and hardened with a putty-like packing material to fill in the step at the end of the ribbon, and also forms a gland packing 24 that also serves as a water seal.The gland packing 24 is fitted into the annular groove 25 of the lid body 16, and the gland packing material is pressed into place. It is fixed via 26. 27 is a rubber gasket interposed between one side of the annular water stop ribbon body 17 and the lid body 16. Further, a lubricating hole 28 is suitably drilled in the lid body 16, and the above-mentioned rubber gasket 27
The annular water stop ribbon body 17 is connected to the oil hole provided in the
The structure is such that lubricating oil such as silicone oil is forcibly fed into the gap between the ribbon tape layers and oozes out between it and the annular mirror plate 5. Further, a seawater passage 30 is bored in the lid body 16 and opens into a seawater filling chamber 29 composed of the propulsion shaft 3 and the seal mechanisms 1 and 2.
It is connected to the outside through a pipe, and the pressure inside the seawater filling chamber 29 is adjusted. The emergency sealing device 13 consists of an annular rubber 32 fitted in an annular groove 31 bored on the inner circumference side of the casing 14 of the stationary side sealing mechanism 2, and a groove with a generally-shaped cross section is formed on the outer circumferential surface of the annular rubber 32. The propulsion shaft 3 is attached to the groove bottom 32a.
Fitting holes 33 are bored at appropriate intervals toward the axis of the
A rod-shaped pressing piece 34 with a flange made of carbon, tetrafluoride resin, etc. is fitted into the fitting hole 33 so that the lower surface of the flange is in contact with the upper surface of the groove bottom 32a, and the bottom surface of the rod is brought into contact with the bottom 32a of the annular rubber 32. A metal ring 35 is fitted into the upper part of the groove of the annular rubber 32 in a lid-like manner so that the inner circumferential surface of the ring 35 faces the outer circumferential end surface of the pressing piece 34. There is. In addition, small holes 36 are bored at the positions of the intermediate ring 35 in contact with each pressing piece 34, and air passage grooves 37 are bored in the surface of the annular groove 31 of the casing 14 in contact with the intermediate ring 35. , each of the small holes 36
An air passage 38 communicating with the air passage groove 37 is bored in the casing 14 and connected to a pipe for supplying compressed air (not shown).
39 is a seawater passage for replenishing seawater to the seawater filling chamber 29 when the emergency sealing device 13 provided on the intermediate flange 12 is used (the pipe connected to the seawater passage 30 is reconnected). When compressed air is fed into the sealing device 13 from the air passage 38 in an emergency, the air flows through the air passage groove 3 along the outer periphery of the intermediate ring 35.
7 through each small hole 36 into the groove of the annular rubber 32, and each pressing piece 34 and the bottom part 32a of the annular rubber 32 are pressed against the propulsion shaft 3. Since the pressing pieces 34 made of raw material work together to block water, seizing of the shaft can be prevented. In particular, when the pressing piece 34 is made of carbon, the friction with the propulsion shaft 3 turns the carbon into powder, which adheres to the outer peripheral surface of the propulsion shaft 3 and acts as a lubricant, further improving the slippage between the propulsion shaft 3 and the annular rubber 32. , completely prevents both from burning. Moreover, by making the pressing piece 34 have the same dimensions on the upper and lower sides with the flange as the center, it can be used inverted when the pressing surface becomes worn. FIG. 4 shows a second embodiment of the emergency sealing device 13, in which the pressing piece 34 is a round bar without a flange, and is press-fitted into the fitting hole 33 and held. This allows the pressing piece 34 to be pushed out and the replacement period of the pressing piece 34 to be extended.

FIG. 5 shows a third embodiment, in which a partition wall 40 in the circumferential direction is provided in the groove of the annular rubber 32, and an outer peripheral chamber 41 is provided.
The partition wall 40 is separated into an inner circumferential chamber 42 and a press piece 34 made of a round bar is press-fitted into the inner circumferential chamber 42 as in the second embodiment. The pressing piece 3 is pushed toward the inner peripheral chamber 42 side.
4 and the bottom portion 32a of the annular rubber 32 are pressed against the propulsion shaft 3, and is configured to prevent air leakage and increase the pressing force. Figures 6 and 7 show a fourth embodiment, in which the pressing piece 34 of the first embodiment has a flange 43 at the top, and a small hole 45 through which a wire or other drawstring 44 is inserted is formed in a circle. The pressing pieces 34 are provided through the pressing pieces 34 in the circumferential direction, and a pull string 44 such as a wire is inserted into the small hole 45 of each pressing piece 34.
By fixing one end of 4 to the casing 14 etc. and pulling the other end, each pressing piece 34 is pressed against the outer peripheral surface of the propulsion shaft 3.If the air supply source such as an air compressor breaks down, , or when a small vessel is not equipped with an air supply source. FIG. 8 shows a fifth embodiment, in which pressing pieces 34 having a T-shaped cross section are embedded in the groove bottom 32a of the annular rubber 32 parallel to the axis of the propulsion shaft 3 at appropriate intervals, and the annular rubber 32 is attached to the propulsion shaft 3. The pressing piece 34 is in contact with the entire width of the surface in contact with the propelling shaft 3, thereby making the rotation of the propulsion shaft 3 smoother. Furthermore, if the pressing piece 34 is made of a hard material such as nylon, it is also possible to scrape off sea scales, barnacles, etc. adhering to the propulsion shaft.

As described above, the stern tube emergency sealing device according to the present invention consists of an annular rubber body with a groove formed on the outer circumferential surface attached to the sealing mechanism main body on the fixed side along the outer circumferential surface of the propulsion shaft. By inserting press pieces made of carbon or synthetic resin into fitting parts formed at appropriate intervals on the bottoms of opposing grooves, and attaching a cover body with an air inlet pipe to the groove mouth to pressurize air into the grooves. The bottom of the groove and the pressing piece are pressed against the outer circumferential surface of the propulsion shaft, and the propulsion shaft is tightened with rubber to block water, and at the same time, the pressing piece made of carbon or synthetic resin with a small friction coefficient reduces friction and prevents seizing of the propulsion shaft. can be prevented. Therefore, there is no need to significantly reduce the speed of the ship by using the emergency seal device, and the operation of the ship will not be significantly hindered. Furthermore, there is no damage to the propulsion shaft or seal device due to seizure, and unnecessary expenses such as labor costs and parts costs due to repairs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a main part of a stern tube sealing device equipped with an emergency sealing device according to the present invention, FIG. 2 is an exploded perspective view of a first embodiment of the emergency sealing device, and FIG. 3 is a cross-sectional view of the same. A perspective view, FIG. 4 is a sectional view of the second embodiment of the emergency seal device, FIG. 5 is a sectional view of the third embodiment, FIG. 6 is a sectional view of the fourth embodiment, and FIG. 7 is a sectional view of the fourth embodiment. Operation explanatory diagram, Figure 8 is the fifth part of the emergency seal device.
FIG. 2 is a perspective view showing a cross section of an example. DESCRIPTION OF SYMBOLS 1... Seal mechanism on rotating side, 2... Seal mechanism on stationary side, 3... Propulsion shaft, 5... Annular mirror plate, 9
... bearing, 13 ... emergency sealing device, 14 ... casing, 15 ... water-stop bellows, 16 ... lid body,
17... Annular ribbon body, 24... Grand packing, 32... Annular rubber, 32a... Shape groove bottom,
33... Fitting hole, 34... Pressing piece, 44... Draw string.

Claims (1)

[Claims] 1. A stationary side seal mechanism and a rotating side seal mechanism are externally fitted onto a propulsion shaft penetrating the stern tube, and the annular water stop ribbon body of the stationary side seal mechanism is brought into contact with the annular mirror plate of the rotating side seal mechanism. In the stern tube sealing device for a water-lubricated bearing, which has a sealing device that stops water and an emergency sealing device attached to the stationary side sealing mechanism main body and externally fitted on the propulsion shaft, the emergency sealing device includes A groove with a roughly shaped cross section is formed on the outer circumferential surface of the groove, fitting portions are formed at appropriate intervals at the bottom of the groove, and pressing pieces made of carbon or synthetic resin are inserted into the groove, and the groove opening is filled with air. 1. An emergency sealing device for a stern tube, characterized in that the bottom of the groove and the pressing piece are pressed against the outer peripheral surface of the propulsion shaft by attaching a lid and pressurizing air into the groove.