CA1312344C - Stern tube seal device - Google Patents
Stern tube seal deviceInfo
- Publication number
- CA1312344C CA1312344C CA000452497A CA452497A CA1312344C CA 1312344 C CA1312344 C CA 1312344C CA 000452497 A CA000452497 A CA 000452497A CA 452497 A CA452497 A CA 452497A CA 1312344 C CA1312344 C CA 1312344C
- Authority
- CA
- Canada
- Prior art keywords
- seal
- shaft
- recess
- pressure
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/002—Sealings comprising at least two sealings in succession
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/321—Bearings or seals specially adapted for propeller shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/321—Bearings or seals specially adapted for propeller shafts
- B63H2023/327—Sealings specially adapted for propeller shafts or stern tubes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
- Sealing Of Bearings (AREA)
- Glass Compositions (AREA)
- Mechanical Sealing (AREA)
Abstract
SPECIFICATION
TITLE OF THE INVENTION
STERN TUBE SEAL DEVICE
ABSTRACT OF THE DISCLOSURE
Disclosed is a stern tube seal device wherein an annular case member is arranged in the outer periphery of a shaft, a plurality of seal members are disposed in an annular gap formed between the shaft and the case member to form a multiple stage seal portion against sea water and lubricating oil, and pressure fluid is fed into the seal portion so as to enhance seal effect by pressure of the fluid.
BACKGROUND OF THE INVENTION
The present invention relates to a stern tube seal device.
One of prior art seal devices of this kind heretofore known has been designed so that a plurality flip seals in close contact with and slidable relative to the shaft are arranged or mechanical seals are disposed so as to prevent both leakings, one being leaking of sea water into a machine (into a ship) and the other being leaking of lubricating oil (bearing oil) outside the ship.
TITLE OF THE INVENTION
STERN TUBE SEAL DEVICE
ABSTRACT OF THE DISCLOSURE
Disclosed is a stern tube seal device wherein an annular case member is arranged in the outer periphery of a shaft, a plurality of seal members are disposed in an annular gap formed between the shaft and the case member to form a multiple stage seal portion against sea water and lubricating oil, and pressure fluid is fed into the seal portion so as to enhance seal effect by pressure of the fluid.
BACKGROUND OF THE INVENTION
The present invention relates to a stern tube seal device.
One of prior art seal devices of this kind heretofore known has been designed so that a plurality flip seals in close contact with and slidable relative to the shaft are arranged or mechanical seals are disposed so as to prevent both leakings, one being leaking of sea water into a machine (into a ship) and the other being leaking of lubricating oil (bearing oil) outside the ship.
Description
~ ~ 2~ ~
; The present invention relates to a stern tube seal device.
One of prior art seal devices of this kind heretofore known has been designed so that a plurality of lip seals in close contact with and slidable relative to.the shaft are arranged or mechanical seals are disposed so as to prevent both leakings, one being leaking of s,ea water into a machlne (into a ship? and the other being leaking of lubricating oil ~bearing oil) outside the ship.
~: ~ t 13~ 23~
However, in these prior arts, the seal relies upon the sliding portion Eormed between the lip seal and the peripheral surface of the shaft or the sliding portion of the mechanical seal. If operation is carried out for a long period of time, the sliding portion tends to be worn or deformed to deteriorate the performance of the seal, resulting in a danger in that lubricating oil flows outside the ship to contaminate the sea.
According to a first broad aspect of the present invention, there is provided a stern tube seal device characterized in that a plurality of annular case members are arranged in the outer periphery of a shaf~, an annular recess portion is provided in the inner peripheral surface of a hole of said case members, a segment seal member is arranged within said annular recess portion, a feeding mechanism is provided to feed pressure gas to said annular recess por-tion closed by said segment seal member, a lip seal member is arranged at the sea water slde of said segment seal member, and a mechanical seal, packings or other float seal member are arranged at the lubricating oil side thereof.
According to a second broad aspect of the present invention, there is provided a stern tube seal device for providing a seal about a rotatable shaft, comprising an annular casing means disposed about the outer periphery of a rotatable shaft, a pair of spaced lip seal means mounted in said casing means and engaging said shaft, said casing means having a recess intermediate said pair of spaced lip seal means, a resilient ring seal means disposed in said recess, and pressure fluid feed line ~3,''~
..
~L3123~
means feeding pressure fluid to said ring seal means, said ring seal means comprising a resilient ring member having a hollow interior, said pressure :Eluid feed line means feeding pressure fluid to said hollow interior, said ring member having generally V-shaped portions juxtaposed to said shaft and forming troughs therebetween, said ring member having passages for passing said pressure fluid from said hollow interior to said troughs.
According to a third broad aspect of the present invention, there is provided a stern tube seal device for providing a seal about a rotatable shaft, comprising an annular casing means disposed about the outer periphery of a rotatable shaft, a pair of spaced lip seal means mounted in said casing means and engaging said shaft, said casing means having a recess intermediate said pair oE spaced lip seal means, a resilient ring seal means disposed in said recess, and pressure fluid feed line means feeding pressure fluid to said ring seal means, said ring seal means comprising a resilient ring member having a hollow interior, said resilient ring member having an inner peripheral portion made of a wear-resistant material.
According to a fourth broad aspect of the present invention, there is provided a stern tube seal for providing a seal about a rotatable shaft which extends from the stern tube of a ship comprising an annular casing means disposed about the outer periphery of a rotatable shaft, said casing having a recess extending about said shaft, a resilient ring member disposed in said recess, said ring member having a hollow interior space, a Eirst conduit means in said casing means for receiving fluid under 2a ;`;~DI
~3123~
pressure from the interior of said ship, said :Eirst conduit means communicating with said hollow interior space, said ring member having at least one generally V-shaped portion juxtaposed to said shaft and forming a trough, said ring member having passage for passing said pressure fluid from said hollow interior to said trough, a first and second seal means mounted on said casing means on opposite sides of said recess, a second conduit means in said casing means for recovering and returning said fluid to said ship, said second conduit means having an inlet opening in said casing means between said recess and said Eirst seal means, said second seal means having an engaging portion engaging said shaft and a sloping portion extending from said engaging portion, said sloping portion sloping radially outwardly as said recess is approached such that fluid under pressure from said first conduit means communicates with said second seal means via said outer clearance space, said passage means and said inner clearance space acting on said sloping portion of said second seal means to reduce the pressure with which said engaging portion of said second seal means engages said shaft to thereby reduce the sliding load between said second seal means and said shaft.
According to a fifth broad aspect of the present inventi.on, there is provided a stern tube seal device characterized in that an annular case member is arranged in the outer periphery of a shaft, a mechanical seal for sealing a portion between sàid case member and the peripheral surface of the : shaft is disposed at a position adjacent to the ship in the inner periphery of said case me~ber, an annular recess portion is formed 2b `Yle~^ ~.r~ i ~ 3~2~4~
externally o:E the ship and of said mechanical seal in the inner peripheral surface of said case member, a limited leaking type seal in sliding relation with the peripheral surface of the shaft is fitted into said annular recess portion, and a pressure fluid feed line, which is open to an annular space between said limited leaking type seal and said mechanical seal, and feeding pressure fluid to said annular space, is provided.
According to a sixth broad aspect of the present invention, there is provided a stern tube seal for providing a seal about a rotatable shaft which extends from the stern tube of a ship comprising an annular casing means disposed about the outer periphery of a rotatable shaft, said casing having a recess ex-tending about said shaft, said recess having an outer radial recess surface, a floating ring member disposed in said recess, said floating ring member having an outer radial ring surface and an inner radial ring surface, sai.d outer radial ring surface being spaced from said outer radial recess surface to form an outer clearance space therebetween, said inner radial ring surface being spaced from said shaft to form an inner clearance space therebetween, said ring member having passage means extending between said inner and outer clearance spaces, a first conduit means in said casing means for receiving fluid under pressure from the interior of said ship, said first conduit means communicating with said outer clearance space, a first and second seal mèans mounted on said casing means on opposite sides of said recess, a second conduit means in said casing means for recovering and returning said Eluid to said ship, said second conduit means 2c ~L3~2~
having an inlet opening in said casing means between said recess and said first seal means, said second seal means having an engaging portion engaging said shaft and a sloping portion extending from said engaging portion, said sloping portion sloping radially outwardly as said recess is approached such that fluid under pressure from said first conduit means communicating with said second seal means via said outer clearance space, said passage means, and said inner clearance space acts on said sloping portion of said second seal means to reduce the pressure with which said engaging portion of said second seal means engages said shaft to thereby reduce the sliding load between said second seal means and said shaft.
~ ccording to a seventh broad aspect of the present invention, there is provided a stern tube seal for providing a seal about a rotatable shaft which extends from the stern tube of a ship comprising an annular casing means disposed about the outer periphery of a rotatable shaf-t, said casing having a recess extending about said shaft, said recess having two recess end faces extending perpendicular to the axis of said shaft and an outer radial recess surface extending between said two recess end faces, a floating ring member disposed in said recess, said floating ring member having two ring end faces extending perpendicular to the axis of said shaft, each of said ring end faces being spaced from the respective recess end face to form lateral clearance spaces between said recess end faces and said ring end faces, said floating ring member having an outer radial ring surface and an inner radial ring surface, said outer radial 2d ~ "t ~1 -~3~23~
ring surface being spaced from said outer radia] recess surface to form an outer clearance space therebetween, said inner radial ring surface being spaced from said shaft to form an inner clearance space therebetween, said ring member having passage means extending between said inner and outer clearance spaces, a first conduit means in said casing means for receiving -Eluid under pressure from the interior of said ship, said first conduit means communicating with said outer clearance space, a first and second lip seal means mounted on said casing means on opposite sides of said recess, a second conduit means in said casing means for recovering and returning said fluid to said ship, said second conduit means having an inlet opening in said casing means between said recess and said first lip seal means, each of said first and second lip seal means having an engaging portion engaging said shaft and a sloping portion extending from said engaging portion, said sloping portion sloping radially outwardly as said recess is approached such that fluid under pressure from said first conduit means communicating with said second lip seal via said outer clearance space, said passage means, and said inner clearance space acts on said sloping portion of said second lip seal means to reduce the pressure with which said engaging portion of said second lip seal means engages said shaft to thereby reduce the sliding load between said second lip seal means and said shaft.
While the present invention has been briefly described, the present invention and other objects and novel features thereof will become completely apparent from reading of the following detailed description in connection with embodiments shown in the '' i ' '~,1 ~
- 13123~
6972~-6 accompanying drawings. However, the drawings show the embodiments merely for the purpose of understanding the presen~ invention and the scope of ~he present invention is not limited thereby. In the drawings:-Fig. 1 is a top half of a sectional view of a stern tubeseal devlce in accordance with a first embodiment;
Fig. 2 is a ~op half of a sectional view of a stern tube seal device in accordance with a second embodiment;
Fig. 3 is a top half of a sectional view of a stern tube seal devlce in accordance with a third embodiment;
Flg. 4 is a sectional view showing an essential part of a stern tuhe seal device in accordance with a fourth embodiment;
Fig. 5 is a sectional view cut in half of a ~31234~
stern tube seal device in accordance with a fifth embodiment;
, i ~ Fig. 6 is a sectional view showing an essential part of a stern tube seal device in accordance with a sixth embodiment;
Fig. 7 is a sectional view cut in half of a stern tube seal device in accordance with a seventh embodiment; and Figs. 8 through 10 are respectively sectional views showing an essential part of a stern tube seal device in accordance with other embodiments.
DESCRIPTION OF PREFERRED EMBODIMENTS
First, a stern tube seal device in accordance with a first embodiment of the present invention will now be described with reference to Fig. 1.
The stern tube seal device generally indicated at 1 seals between a shaft or a sleeve 2 fitted externally of the shaft and a ship body 3 in which the shaft is inserted. A reference numeral 4 designates a part of a propeller mounted on the extreme end of the shaft.
A reference numeral 5 designates a first .
case member (casing) fixed to the ship body 3 through , ; a gasket 9, and a second case member (an intermediate j ring 6), a third case member (an adapter ring 7) .
13~ 23~
and a fourth case member (an aft cover 8) are airtightly mou'n~ed~in said order from the first case member 5 towards sea water A by use of packings 10 or the like. In these case members 5, 6, 7 and 8 which are annular in shape, only the second case member 6 has a large diameter hole, said second case member 6 having an annular recess portion 11 formed in the inner periphery thereof, said annular recess portion 11 having a pair of segment seal members 12 and 12 disposed therein. The segment seal members 12 and 12 are brought into close contact with the outer periperal surface of the sleeve 2 by fastening forces of garter springs 13 and 13, the segment seal member 12 at the left side in the figure being brought into close contact with the end of the third case member 7 by the stretching force of a coiled spring 14 resiliently mounted on the opposed surface between both the members 12 and 12 whereas the segment seal member 12 at the right side being brought in~o close contact with the end of the first case member 5. -A pin 16 fixed to the first case member 5 is fitted into holes 15 and 15 coaxially bored in both the members 12 and 12 to stop rotation of the segment seal members 12 and 12 with respect to the case member 5.
~ 5 ~
: :
~3~2~
A reference numera]. 17 designates a lip sea~l mem`ber held and secured between the third and fourth case members 7 and 8, and an annular lip 18 having a garter spring 19 fastened thereto is brought into close contact with the outer peripheral surface of the sleeve 2 against sea water A. A reference numeral 20 designates a mechanical seal disposed at the side of lubricating oil B of the segment seal members 12 and 12, which machanical seal comprises a slidable ring 21 at the fixed side fitted in the inner periphery of a shoulder of the first case member 5 and a slidable ring 24 at the rotational side stopped by a pin 23 with respect to a cover ring 22 fixed to the sleeve 2 and driven as the shaft rotates to form a seal sliding surface 25 in a contact surface between both the slidable rlngs 21 and 24. The`slidable ring 24 at the rotational side is resiliently biased towards the slidable ring 21 at the fixed side by means of a coiled spring 26. A reference numeral 27 designates a preesure gas feeding mechanism in .
communication with the interior of the annular~recess portion 11 closed by the segment seal members 12 and 12 from the side of the ship body 3, wherein a pipe line is disposed which extends through the-first and second case members 5 and 6 from the ship ~12~
body 3, and pressure gas is fed into the annular rècess portion ll by a feeding device (not shown) disposed therein. A reference numeral 28 designates a leaked liquid recovery.mechanism formed separately from the pressure gas feeding mechanism 27, which is open to a space between the segment seal member 12 and the mechanical seal 20 to recover the leaked liquid entered the space into the ship.
As described above, the stern tube seal device 1 constructed as described above is to prevent leaking of sea water A into the ship and leaking of lubricating oil B outside the ship. In general, the pressure gas feeding mechanism 27 and leaked liquid recovery mechanism 28 are placed in operation .
during sealing. On the other hand, the lip seal member 17 and segment seal member 12 serve to prevent sea water A from leaking-in, and particularly, the segment seal member 12 is pushed by pressure gas ..
fed into the annular recess portion 11 at the rear thereof and strongly pressed against the sleeve 2 and case member 7 to enhance the seal effect of the seal portion. In addition, when pressure of the pressure gas is increased, the pressure gas passes ~hrough the seal portion and is conversely present in the space between the lip seal member 17 and segment .
. - 7 -~3 ~ 23~
seal member 12 or balanced with sea water pressure , in said space to display the seal eEfect. Furthermore, when the space is filled with pressure gas, back pressure is applied to the lip seal member 17 to place the lip seal member 17 in an idling state (the force in close contact with the sleeve 2 disappears) to prevent early wear, deformation or the like of .the member 17. In this case, the lip seal member -17 acts as a dust seal which prevents entry of foreign matter into the ship, but when pressure of pressure gas decreases, the lip seal member 17 is pressed by sea wat:er pressure into close contact with the sleeve 2 t~o automatically act as a first sea water resisting seal. Next, for the other lubricating oil B, the mechanical seal 20 acts as a first seal portion to;~prevent it from leaking-out, and even if the lubricating oil B should leak through the seal portion, leaking of the oil outside the ship could be c,ompletely cut off by the segment seal 12.
If the lubricating oil B enters the space between - the mechanical seal 20 and the segment seal portion 12, the oil passes through the seal portion of the segment seal member 12 and is recovered together with pressure gas invaded into the space into the ship by the leaked oil recovery mechanism 28, fo~
: - 8 -".~ .
, .. , ~ ' ' 13~2~4 reuse. The stern tube seal device constructed as descri`bed above can completely seal both sea water A and lubricating oil B in a manner as described above.
Next, a second embodiment of the present invention will be described with reference to Flg 2 In Fig. 2, the same reference numerals as those used in the above-described first embodiment (Fig. 1) designate the same members. That is, a reference numeral 2 designates a sleeve, 3 a ship body, 4 a propeller, 5, 6, 7 and 8 case members, 11 an annular recess portion, 12 and 12 segment seal members, 17 a lip seal member, 27 a pressure gas feeding mechanism, and 28 a leaked oil recovery mechanism.
A stern tube seal device 30 having these members is principally different from the device shown in the above-described first embodiment in the following. That is, a fifth case member 31 is fitted in the inner periphery of a shoulder of the ~
first case member 5, and a~second lip seal member , 32 is held and secured between both the members 5 and 31. A sixth case member 33 is further fitéed at the side of lubricating oil B of the fifth case member 31, and a third segment seal member 34 is mounted as a float seal member in a space between ~ 3~2~
both the members 31 and 33. The segment seal member .~ 34 is brought into close contact with the outer peripheral surface of the sleeve 2 by a garter spring 35 fitted in the outer periphery of the segment seal member and brought into close contact with the end ' of the fifth case member 31 by a coiled spring 36 '' to be stopped by a pin not shown with respect to the sixth case member 33. A pipe line of a second leaked liquid recovery mechanism 37, which is open to a space between the lip seal member 32 and segment seal member 34, is provided extending from the fifth . case member 31 to the first case member 5. The first and second leaked liquid recovery mechanisms 28 and 37 can provide the junction of pipe lines within the first case member 5 or ship body 3 to use in :
common of'an intake recovery device such as a pump.
The stern tube seal device 30 constructed as described above displays similar operation and effect in seal water A resisting seal to those of the above-described first embodiment. As for lubricat-ing oil B, the first seal portion is formed by the third segment.seal member 34 to assume the extremely .
reduced state even if lubricating oil leaking through the seal portion is present, and therefore, sufficient sealing can be achieved by the lip seal''me'mber 32!! ~
.
' "
~3~234~
without much difficulty to recover it into the ship ~by the leaked liquid recovery mechanism 37.
Next, a third embodiment will be described with reference to Fig. 3.
In this figure, a reference numeral 42 designates a shaft (including a sleeve slipped external-ly on the shaft) to left-hand of which is mounted a screw not shown. A case member 43 comprising first to fifth members 44, 45, 46, 47 and 48 is arranged in the outer periphery of the shaft 42 and fixed to a ship body 50 through a packing 49. A reference numeral 51 designates an outer lip seal which is located in the inner periphery of a hole of~the case member 43 and held between the first case member 44 and the second case member 45, the outer;lip seal having a pressure receiving surface 51a, which is fitted with a fastening ring 52, arranged opposite sea water A. A back-up ring portion 45a for controlling operation of the lip seal 51 is provided at the rear of the second case member 45 with respect to the ; lip seal 51. A reference numeral 53 designa;tes an inner lip seal held between the fourth case;member 47 and the fifth case member 48, the inner llp seal having a pressure receiving surface 53a, which is A ' fitted with a fastening ring 54, directed towards ~3~23'~
lubricating oil B which is opposite the outer lip sea~:Sl.:` A back-up ring portion 47a with respect to the lip seal 53 is provided in the inner periphery of the fourth case member 47. The inside diameter of the third case member 46 among the case member 43 is made greater than that of other four members 44, 45, 47 and 48, particularly the second and fourth case members 45 and 47, and an annular recess portion 55 is formed in the inner periphery of the third case member 46, the annular recess portion 55 being provided therein with a floating ring seal 56. This floating ring seal 56 is such that a knock-pin 57 projected on the fourth case member 47 engages a cut 56a formed in one end thereo-f to be stopped with respect to the case member 43 and both ends and an inner peripheral surface thereof are slightly distanced form the ends of the second and fourth case members 45 and 47 and the peripheral surface of the shaft 42 to form fine clearances 58, 59 and 60. The floating ring seal 56 is formed in its inner perlpheral.surface , with an annular groove 56b and provided with the required number of through-holes 56c which extend through the inner and outer peripheral surfaces.
A reference numeral 61 designates a feed line of pressure fluid in communication with the annular 13~23~
recess portion 55 partitioned by the floating ring seai `56`from the side of the ship body, which line extends through the third and fourth case members 46and 47to feed pressure fluid into the annular recess portion 55 from a fluid feed device (not shown) disposed within the ship. A reference numeral 62 designates a leaked liquid recovery line formed separately from the pressure fluid feed line 61, which recovery line is open to a space between the floating ring seal 56 and the internal lip seal 53 to recover leaked liquid entered the space into the ship by means of a pump or the like not shown.
In the stern tube seal device 41 constructed as described above, when pressure fluid is fed into the annular recess portion 55 from the pressure fluid feed line 61, the annular recess portion 55 and annular groove 56b of the floating ring seal 56 in communication with the recess portion 55 through the through-hole 56c are filled with pressure fluid, and the pressure fluid passes through the clearances 58, 59 and 60 and gradually flows into spaces 63 and 64. Among this pressure fluid, pressure fluid flowing into the space 63 between the external lip seal 51 and floating ring seal 56 is stored in the space 63 so as to act as back pressure with respect to the external ~3123~
lip seal 51 to lower a sliding load between the lip seal~ 51 and the peripheral surface of the shaft 42 and to prevent entry of sea water. In this case, it is considered that the pressure fluid might flow outside the ship~ depending on pressure, and therefore, it is desireable to select and use pressure fluid which poses no problem in terms of contamination of the sea, most preferably, air or the like. On the other hand, pressure fluid flown into the space between the internal lip seal 53 and the floating ring seal 56 is recovered into the ship from the leaked liquid recovery line 62 together with lubricating oil B leaked out of the internal lip seal 53, if any. In this manner, the floating ring seal 56 is possible to sufficiently perform a function as a secondary seal with respect to the lip seals 51 and ;
53 as far as pressure fluid is being fed. Even if feeding of pressure fluid is stopped for some reason, the floating ring seal 56 functions as a secondary seal of a limited leaking type to maintain the sealing effect to some extent in cooperation with the recovery mechanism by the leaked liquid recovery line 62.
Accordingly, in accordance with the seal device 41 constructed as described above, the external lip seal 51 is pressed at the rear surface by the pressure 13123ll~
fluid to lower the sliding load between the lip seal 51 and the peri.pheral surface of the shaft 42 to enhance the durality of the lip seal 51, which has been heretofore worn materially, to positively seal both sea water A and lubricating oil B and to recover the lubricating oil B into the ship through the leaked liquid recovery line 62, thus removing a fear of - contamination of the sea. Next, Fig. 4 shows an essential part of a fourth embodiment. That is, the floating ring seal 56 comprises a double type seal 65 whose rear surfaces are opposed. Both seal : members 66 and 67 are stopped for rotation by a common .knock-pin 68, and the required number of springs 6g are interposed between both the seal members 66 and 67. ~.
Next, a fifth embodiment of the present invention will be described with reference to Fig. 5.
In this figure, a reference numeral 72 designates a shaft (including a sleeve slipped external-ly on the shaft) to left-hand of which is mounted a screw not shown. A case member 73 comprising first to fifth members 74, 75, 76, 77 and 78 is arranged in the outer periphery of the shaft 72 and fixed to a ship body 80 through a packing 79. A reference numeral 81 designates an outer lip seal which is . - 15 -1~1 23~
located in the inner periphery of the hole of the case member 73 and held between the first case member 74 and the second case member 75, the outer lip seal having a pressure receiving surface 81a, which is fitted with a ~astening ring 82, arranged opposite sea water A. A back-up ring portion 75a for controlling operation of the lip seal 81 is provided at the rear of the second case member 75 with respect to the lip seal 81. A reference numeral 83 designates an inner lip seal held between the fourth case member 77 and the flfth case member 78, the inner lip seal having a pressure receiving surface 83a, which is fitted with a fastening ring 84, directed towards lubricating oil B which is opposite the outer lip seal 81. A back-up ring portion 77a with respect to the lip seal 83 is provided in the inner periphery of the fourth case member 77. The inside diameter of the third case member 76 among the case member 73 is made greater than that of other four members 74, 75, 77 and 78, particularly the second and fourth case members 75 and 77, and an annular recess portion 85 is formed in the inner periphery of the third case member 76. A reference numeral 86 designates a pressure type hollow ring made of rubber fitted into the annular recess portion 85j the hollow ring:' ~L3~234~
having a plurality (three shown in the figure) of annular crest portions 86acontinuously provided in the inner peripheral surface thereof, said crest portions 86a serving as a seal portion in contact with the shaft 72, and having the required number (two shown in the figure) of fine holes 86d bored to provide communication between a ~rough portion 86b, between the crest portions 86a, and a hollow portion 86c. A reference numeral 87 designates a pressure fluid feed line bored from the ship body side towards the hollow portion 86c of the pressure hollow ring 86 to feed pressure fluid into the hollow portion 86c from a fluid inlet device (not shown) disposed within the ship. A reference numeral 88 designates a leaked liquid recovery line formed separately from the pressure fluid feed line 87, which recovery line is open to a space between the pressureltype hollow ring 86 and the inner lip seal 83 to recover leaked liquid entered the space into the ship by means of a pump or the like not shown.
In the stern tube seal device 71 constructed as described above, when pressure fluid is fed into the hollow portion 86c of the pressure type hollow rlng 86 from the pressure fluid feed line 87, the pressure fluid is filled into the hollow portion~
!
~31 ~34~
86c, passes through the fine holes 86d and filled into a space of a ;~riangular section surrounded by inclined surfaces of ~he adjacent two crest portions 86a and the peripheral surface of the shaft 72 whereby pressure is balanced by the space and hollow portion 86c to bring the pressure type hollow ring 86 into contact with the shaft 72 under the condition of low load. When pressure fluid is further fed, the pressure fluid breaks a seal portion between the pressure type hollow ring 86 and the shaft 72 and flows into the spaces 89 and 90. Pressure fluid flown into the space 89 between the outer lip seal 81 and the pressure type hollow ring 86 is stored in the space 89 to act as back pressure with respect to the outer lip seal 81, thus lowering the sliding load between the lip seal 81 and the peripheral surface of the shaft 72 and prevent entry of sea water A.
In this case, it is considered that the pressure .
fluid might spread the lip seal 81 and flows outside -the ship depending on pressure, and therefore, it ;
is desireable to select and use pressure fluid which .
poses no problem in terms of contamination of the sea, for example, such as compressed air. On the other hand, pressure fluid flown into the space 90 between the internal lip seal 83 and the pressure ~ ; ' ~ - 18 -1~23~
type hollow ring 86 is recovered into the ship from the leaked liquid recovery line 88 together with lubricating oil B leaked out of the internal lip seal 83, if any. In this manner, the pressure type hollow ring 86 is possible to sufficiently perform a function as a secondary seal with respect to the lip seals 81 and 83 as far as pressure fluid is being fed. Even if feeding of pressure fluid is stopped for some reason, the hollow rlng functions as a secondary seal of a llmlted leaking type to malntain the sealing effect to some extent in cooperation with the function of the leaked llquld recovery line 88. Accordingly, in accordance with the seal device 71 constructed as described above, the external llp seal 81 is pressed at the rear surface by the pressure fluid to lower the sliding load between the lip seal 81 and the peripheral surface of the shaft 72 to enhance the durablity of the lip seal 81, which has been heretofore worn materially, to positively seal both sea water A and lubricating oil B and to recover the lubricating oil B into the ship through the leaked liquid recovery line 88, thus removing a fear of contamination of the sea. Next, Flg. 6 shows an essential;part of a slxth embodiment. That ls, the inner peripheral portion 86e of the pressure typè `
.
, ~' .
~312~
hollow ring 86 is formed of synthetic rubber or fluoro-re~in which is~excellent in wear resis~ance to enhance ~ R~p6~
the wear ~e~r~e.
~ - Next, a seventh embodiment of the present invention will be described with reference to Fig. 7.
In ~ig. 7, the stern tube seal device general-ly indicated at 101 is mounted in an opening of a hole of a ship body 103 so as to seal between a sleeve 102 fitted externally of a shaft (not shown) and a ship body lQ3 in which the shaft is inserted.
A reference numeral 10~ designates a part of a propeller ' mounted on the extreme end of the shaft. In the stern tube seal deivce 101, a reference numeral 105 designates a first casing fixed to the end of the ship body 103 through a gasket 106, and on the side of sea water A of the first casing 105, a second cas,ing (adapater ring) 107 and a third casing (aft cover) are airtightly fixed by suitable 0-rings 109 or the like. In the inner peripheral surface of the second caseing 107, an annular recess portion llO is formed by t~e second casing 107 and the first casi~g lOS at the side of the ship, the annular recess portion 110 having a segement seal 111 as a limited leaking type seal mounted therein. This segment seal 111, which are circumferentially divided into ~12~
plural portions, is fastened by a garter spring 112 fitted in the outer periphery thereof and ls slidably moved in close contact with the peripheral surface of the sleeve 102 and brought into close contac~ $
with a wall surface 107a of the second casing 107 ~ , -by a coiled spring 113 disposed at the side of`~ip.
The divided elements of the segement seal 111 are ~ `
stopped to be rotated against the casings 105 a~d 107 by means of pins not shown projected from the first or second casing 105, 107. A reference numeral 114 designates a lip seal held and secured between~
the second and third casings 107 and 108, the lip .
seal having a pressure receiving surface 114a fast~ened !; .
by a garter spring 115 directed towards sea water ~, and being slidably moved in close contact with the .
~ ~: outer periphery of the sleeve 102. A back-up ring : , portion 107b for controlling excessive deformation ~
of the~lip seaI 114 is provided on the back of the .
lip seal 114 of the second casing 107. A reference ~
numeral 116 designates a mechanical seal arranged .
~ :
. ~ at a position closer to lubricating oil B in the nner periphery of~a~hole of the first casing lOS,;
which seal is fitted in a shoulder of the first casing 105 and maintained.airtight by an 0-ring 118. The . ~ mechanical seal comprises a sliding ri~g 117 at t~he~ .
:
1312~
fixed side stopped for rotation against the casing 105 by means of a pin not shown, a cover ring 119 fixed to the sleeve 102 by means of a pin uot shown and a sliding ring 120 at the rotational side rotated as the shaft stopped for rotation by means of a pin not shown rotates. The sliding ring 120 at the rotational side is pressed by a coiled spring 121 to form a sealed slidtng surface 122 in the surface in contact with the sliding ring 117 at the fixedi'~
side. A reference numeral 113 designates a pressure fluid feed line for feeding pressure fluid from the side of the ship body 103 towards a space 124 of an annular hole formed between the segment seal 111 and the mechanical seal 116, wherein a p~pe line open to the spacethrough the first casing 105 from .
the ship body 103 is arranged, and a feed device not shown is provided within the ship body 103.
The stern tube seal device 101 constructed as described above is designed to prevent entry of sea water and~slurry contained ln sea water into the~mechanical seal 116 by the llp seal 114 arraneed externally of the mechanical seal 116 (on the s~ea water side), the segment seal 111 and the pressu~e fluid. It is noted;that durine sealing, as a rule, the feed device is actuated to feed pressure fluid.
: : ~
~ 22 -.
' :
~31234~
That is, Eirst, the lip seal 114 and segment seal l~ll serve to p~event entry of sea water A, and particularly, the segmen-t seal 111 is pressed against the peripheral surface oE the sleeve 102 and the wall surface 107a of the second casing 107 to enhance the sealing effect. When pressure of pressure fluid exceeds a certain level with respect to the segment seal 111 which is of a limited leaking type, the pressure fluid flows towards the lip seal 114 conversely but the pressure fluid is also balanced with sea water pressure to exhibit the sealing effect. When the space between the lip~seal 114 and segment seal 111 is filled with pressure fluid, back pressure is applied to the lip seal 114 by the pressure fluid . , .
to place the lip seal 114 in an idling state balanced with sea wa-er pressure thereby preventing early wear, de~formation or the like due to the sliding contact between the lip seal 114 and sleeve 102.
.
The lip seal 114 also acts as a dust seal which prevents entry of foreign matter into the ship, but when pre6sure`
:, :
of pressure fluid a-t the rear decreases for some reason, the~lip seal is pressed by sea water pressure into close contact with the sleeve 102 to automatically act as a first sea water resisting seal. It is noted ~ that the pre66Ure fluid mlght spread the llp seal ; - 23 -, ::
~ .
13~23~
114 depending on pressure and Elows outside the ship, and~therefore, air, nitrogen gas, clean water or the like which involves no problem such as public hazards even if the fluid leaks into sea water are desirable for use. On the other hand, lubricating oil B can be completely sealed by the mechanical seal 116 which has been increased in durable sealing properties by the above-described structure.
~ ext, Figs. 8 to 10 show modified embodiments of the present invention in which in place of a~segment seal of a limited leaking type seal described in the previous embodiment, an integral type (which is not divided peripherally) floating ring seal 125 (Fig. 8), anend type rubber seal 127 (Fig. 9) or a hollow type pressure ring 130 (Fig. 10) is used.
That is, a floating ~ing seal 125 shown in Fig. 8 is s-topped for rotation by means of a pin (not shown) mounted on the first or second casing 105, 107 and pressed by a coiled spring 126 in contact with the wall surface 107a of the second casing 107 and has a fine clearance relative to the peripheral surface of the sleeve 102 to seal pressure fluid in a!manner of limited leaking type. ~n end type rubber seal 127 shown in Fig. 9 is slipped over the sleeve 102 by a garter spring 128 to form a sealed sliding surface ~ - 24 -~3~23~ -relative to the wall surface 107a of the second casing 1'07`to seal fluid by said surface. A flushing line 129 is open to an annular groove 127a formed in said surface from the second casing 107. This flushing line is branched from the pressure fluid feed llne 123, and clean water is used as a feed fluid to thereby provide lubrication for the sliding surface. A hollow type pressure ring 130 shown in Fig. 10 is mounted in close contact with the first and second casings 105 and 107 as if filled in the annuar recess portion 110, and is branched from the pressure fluid feed line 123 relative to the hollow portion 130a or fed with pressure air fro~ a line 131 separately provided so that it is e~panded in a direction of inside diameter to come into close slidable contact with ~he peripheral surface of the sleeve 102. Use ~ `
of the pressure type hollow rlng 130 enables to vary~
the state oI close contact wit`h the peripheral surface of the sleeve 102 by controIllng a feed amount of the pressur~e alr to adjust a leaking amount of the pressure fluld. ~n~inner~peripheral surface portion ;;of the hollow ring~130, whlch is normally formed~
of synthetic rubber or the like, can be formed of a sliding material such as fluororesin to thereby~
enhance th~e~wear reslstance.;
:, : ~ . :
~ 25 -'~ ~ ' ' ''.' ~ 3~2~
In the stern tube seal device oE the present invention, ~enerally, a segment seal member, a lip seal member, a mechanical seal and the like constltute a multiple stage seal portion, and pressure of pressure fluid is utili~ed, as described above. Therefore, not only the excellent sealing performance with~respect to both sea water and lubricating oil is displayed but also the lip seal or the like arranged closer to sea water can be relieved in burden by the pressure of pressure fluid or to prevent damages given to a mechanical seal, thus enhancing the long-period durability of the whole device. ~oreover, according to the stern tube seal device of the present invention, contamination of the sea can be prevented to effectively cope with various problems ln contamination which has been recently raised as an international problem.
While the preferred embodiments of the ~ ;
present invention have been described, it will be apparent that the present invention can be variously;~
modified without departing the princlple thereof.
It is therefore desired that all the modifications, by~which the ef~ects of the present invention~are obtained substant~ially through the use of substantially identical or corresponding structures, are included ~
in the category of the present invention by the appended clalms. ~ ~ -: : , :
. ~' ' ~
, .
; The present invention relates to a stern tube seal device.
One of prior art seal devices of this kind heretofore known has been designed so that a plurality of lip seals in close contact with and slidable relative to.the shaft are arranged or mechanical seals are disposed so as to prevent both leakings, one being leaking of s,ea water into a machlne (into a ship? and the other being leaking of lubricating oil ~bearing oil) outside the ship.
~: ~ t 13~ 23~
However, in these prior arts, the seal relies upon the sliding portion Eormed between the lip seal and the peripheral surface of the shaft or the sliding portion of the mechanical seal. If operation is carried out for a long period of time, the sliding portion tends to be worn or deformed to deteriorate the performance of the seal, resulting in a danger in that lubricating oil flows outside the ship to contaminate the sea.
According to a first broad aspect of the present invention, there is provided a stern tube seal device characterized in that a plurality of annular case members are arranged in the outer periphery of a shaf~, an annular recess portion is provided in the inner peripheral surface of a hole of said case members, a segment seal member is arranged within said annular recess portion, a feeding mechanism is provided to feed pressure gas to said annular recess por-tion closed by said segment seal member, a lip seal member is arranged at the sea water slde of said segment seal member, and a mechanical seal, packings or other float seal member are arranged at the lubricating oil side thereof.
According to a second broad aspect of the present invention, there is provided a stern tube seal device for providing a seal about a rotatable shaft, comprising an annular casing means disposed about the outer periphery of a rotatable shaft, a pair of spaced lip seal means mounted in said casing means and engaging said shaft, said casing means having a recess intermediate said pair of spaced lip seal means, a resilient ring seal means disposed in said recess, and pressure fluid feed line ~3,''~
..
~L3123~
means feeding pressure fluid to said ring seal means, said ring seal means comprising a resilient ring member having a hollow interior, said pressure :Eluid feed line means feeding pressure fluid to said hollow interior, said ring member having generally V-shaped portions juxtaposed to said shaft and forming troughs therebetween, said ring member having passages for passing said pressure fluid from said hollow interior to said troughs.
According to a third broad aspect of the present invention, there is provided a stern tube seal device for providing a seal about a rotatable shaft, comprising an annular casing means disposed about the outer periphery of a rotatable shaft, a pair of spaced lip seal means mounted in said casing means and engaging said shaft, said casing means having a recess intermediate said pair oE spaced lip seal means, a resilient ring seal means disposed in said recess, and pressure fluid feed line means feeding pressure fluid to said ring seal means, said ring seal means comprising a resilient ring member having a hollow interior, said resilient ring member having an inner peripheral portion made of a wear-resistant material.
According to a fourth broad aspect of the present invention, there is provided a stern tube seal for providing a seal about a rotatable shaft which extends from the stern tube of a ship comprising an annular casing means disposed about the outer periphery of a rotatable shaft, said casing having a recess extending about said shaft, a resilient ring member disposed in said recess, said ring member having a hollow interior space, a Eirst conduit means in said casing means for receiving fluid under 2a ;`;~DI
~3123~
pressure from the interior of said ship, said :Eirst conduit means communicating with said hollow interior space, said ring member having at least one generally V-shaped portion juxtaposed to said shaft and forming a trough, said ring member having passage for passing said pressure fluid from said hollow interior to said trough, a first and second seal means mounted on said casing means on opposite sides of said recess, a second conduit means in said casing means for recovering and returning said fluid to said ship, said second conduit means having an inlet opening in said casing means between said recess and said Eirst seal means, said second seal means having an engaging portion engaging said shaft and a sloping portion extending from said engaging portion, said sloping portion sloping radially outwardly as said recess is approached such that fluid under pressure from said first conduit means communicates with said second seal means via said outer clearance space, said passage means and said inner clearance space acting on said sloping portion of said second seal means to reduce the pressure with which said engaging portion of said second seal means engages said shaft to thereby reduce the sliding load between said second seal means and said shaft.
According to a fifth broad aspect of the present inventi.on, there is provided a stern tube seal device characterized in that an annular case member is arranged in the outer periphery of a shaft, a mechanical seal for sealing a portion between sàid case member and the peripheral surface of the : shaft is disposed at a position adjacent to the ship in the inner periphery of said case me~ber, an annular recess portion is formed 2b `Yle~^ ~.r~ i ~ 3~2~4~
externally o:E the ship and of said mechanical seal in the inner peripheral surface of said case member, a limited leaking type seal in sliding relation with the peripheral surface of the shaft is fitted into said annular recess portion, and a pressure fluid feed line, which is open to an annular space between said limited leaking type seal and said mechanical seal, and feeding pressure fluid to said annular space, is provided.
According to a sixth broad aspect of the present invention, there is provided a stern tube seal for providing a seal about a rotatable shaft which extends from the stern tube of a ship comprising an annular casing means disposed about the outer periphery of a rotatable shaft, said casing having a recess ex-tending about said shaft, said recess having an outer radial recess surface, a floating ring member disposed in said recess, said floating ring member having an outer radial ring surface and an inner radial ring surface, sai.d outer radial ring surface being spaced from said outer radial recess surface to form an outer clearance space therebetween, said inner radial ring surface being spaced from said shaft to form an inner clearance space therebetween, said ring member having passage means extending between said inner and outer clearance spaces, a first conduit means in said casing means for receiving fluid under pressure from the interior of said ship, said first conduit means communicating with said outer clearance space, a first and second seal mèans mounted on said casing means on opposite sides of said recess, a second conduit means in said casing means for recovering and returning said Eluid to said ship, said second conduit means 2c ~L3~2~
having an inlet opening in said casing means between said recess and said first seal means, said second seal means having an engaging portion engaging said shaft and a sloping portion extending from said engaging portion, said sloping portion sloping radially outwardly as said recess is approached such that fluid under pressure from said first conduit means communicating with said second seal means via said outer clearance space, said passage means, and said inner clearance space acts on said sloping portion of said second seal means to reduce the pressure with which said engaging portion of said second seal means engages said shaft to thereby reduce the sliding load between said second seal means and said shaft.
~ ccording to a seventh broad aspect of the present invention, there is provided a stern tube seal for providing a seal about a rotatable shaft which extends from the stern tube of a ship comprising an annular casing means disposed about the outer periphery of a rotatable shaf-t, said casing having a recess extending about said shaft, said recess having two recess end faces extending perpendicular to the axis of said shaft and an outer radial recess surface extending between said two recess end faces, a floating ring member disposed in said recess, said floating ring member having two ring end faces extending perpendicular to the axis of said shaft, each of said ring end faces being spaced from the respective recess end face to form lateral clearance spaces between said recess end faces and said ring end faces, said floating ring member having an outer radial ring surface and an inner radial ring surface, said outer radial 2d ~ "t ~1 -~3~23~
ring surface being spaced from said outer radia] recess surface to form an outer clearance space therebetween, said inner radial ring surface being spaced from said shaft to form an inner clearance space therebetween, said ring member having passage means extending between said inner and outer clearance spaces, a first conduit means in said casing means for receiving -Eluid under pressure from the interior of said ship, said first conduit means communicating with said outer clearance space, a first and second lip seal means mounted on said casing means on opposite sides of said recess, a second conduit means in said casing means for recovering and returning said fluid to said ship, said second conduit means having an inlet opening in said casing means between said recess and said first lip seal means, each of said first and second lip seal means having an engaging portion engaging said shaft and a sloping portion extending from said engaging portion, said sloping portion sloping radially outwardly as said recess is approached such that fluid under pressure from said first conduit means communicating with said second lip seal via said outer clearance space, said passage means, and said inner clearance space acts on said sloping portion of said second lip seal means to reduce the pressure with which said engaging portion of said second lip seal means engages said shaft to thereby reduce the sliding load between said second lip seal means and said shaft.
While the present invention has been briefly described, the present invention and other objects and novel features thereof will become completely apparent from reading of the following detailed description in connection with embodiments shown in the '' i ' '~,1 ~
- 13123~
6972~-6 accompanying drawings. However, the drawings show the embodiments merely for the purpose of understanding the presen~ invention and the scope of ~he present invention is not limited thereby. In the drawings:-Fig. 1 is a top half of a sectional view of a stern tubeseal devlce in accordance with a first embodiment;
Fig. 2 is a ~op half of a sectional view of a stern tube seal device in accordance with a second embodiment;
Fig. 3 is a top half of a sectional view of a stern tube seal devlce in accordance with a third embodiment;
Flg. 4 is a sectional view showing an essential part of a stern tuhe seal device in accordance with a fourth embodiment;
Fig. 5 is a sectional view cut in half of a ~31234~
stern tube seal device in accordance with a fifth embodiment;
, i ~ Fig. 6 is a sectional view showing an essential part of a stern tube seal device in accordance with a sixth embodiment;
Fig. 7 is a sectional view cut in half of a stern tube seal device in accordance with a seventh embodiment; and Figs. 8 through 10 are respectively sectional views showing an essential part of a stern tube seal device in accordance with other embodiments.
DESCRIPTION OF PREFERRED EMBODIMENTS
First, a stern tube seal device in accordance with a first embodiment of the present invention will now be described with reference to Fig. 1.
The stern tube seal device generally indicated at 1 seals between a shaft or a sleeve 2 fitted externally of the shaft and a ship body 3 in which the shaft is inserted. A reference numeral 4 designates a part of a propeller mounted on the extreme end of the shaft.
A reference numeral 5 designates a first .
case member (casing) fixed to the ship body 3 through , ; a gasket 9, and a second case member (an intermediate j ring 6), a third case member (an adapter ring 7) .
13~ 23~
and a fourth case member (an aft cover 8) are airtightly mou'n~ed~in said order from the first case member 5 towards sea water A by use of packings 10 or the like. In these case members 5, 6, 7 and 8 which are annular in shape, only the second case member 6 has a large diameter hole, said second case member 6 having an annular recess portion 11 formed in the inner periphery thereof, said annular recess portion 11 having a pair of segment seal members 12 and 12 disposed therein. The segment seal members 12 and 12 are brought into close contact with the outer periperal surface of the sleeve 2 by fastening forces of garter springs 13 and 13, the segment seal member 12 at the left side in the figure being brought into close contact with the end of the third case member 7 by the stretching force of a coiled spring 14 resiliently mounted on the opposed surface between both the members 12 and 12 whereas the segment seal member 12 at the right side being brought in~o close contact with the end of the first case member 5. -A pin 16 fixed to the first case member 5 is fitted into holes 15 and 15 coaxially bored in both the members 12 and 12 to stop rotation of the segment seal members 12 and 12 with respect to the case member 5.
~ 5 ~
: :
~3~2~
A reference numera]. 17 designates a lip sea~l mem`ber held and secured between the third and fourth case members 7 and 8, and an annular lip 18 having a garter spring 19 fastened thereto is brought into close contact with the outer peripheral surface of the sleeve 2 against sea water A. A reference numeral 20 designates a mechanical seal disposed at the side of lubricating oil B of the segment seal members 12 and 12, which machanical seal comprises a slidable ring 21 at the fixed side fitted in the inner periphery of a shoulder of the first case member 5 and a slidable ring 24 at the rotational side stopped by a pin 23 with respect to a cover ring 22 fixed to the sleeve 2 and driven as the shaft rotates to form a seal sliding surface 25 in a contact surface between both the slidable rlngs 21 and 24. The`slidable ring 24 at the rotational side is resiliently biased towards the slidable ring 21 at the fixed side by means of a coiled spring 26. A reference numeral 27 designates a preesure gas feeding mechanism in .
communication with the interior of the annular~recess portion 11 closed by the segment seal members 12 and 12 from the side of the ship body 3, wherein a pipe line is disposed which extends through the-first and second case members 5 and 6 from the ship ~12~
body 3, and pressure gas is fed into the annular rècess portion ll by a feeding device (not shown) disposed therein. A reference numeral 28 designates a leaked liquid recovery.mechanism formed separately from the pressure gas feeding mechanism 27, which is open to a space between the segment seal member 12 and the mechanical seal 20 to recover the leaked liquid entered the space into the ship.
As described above, the stern tube seal device 1 constructed as described above is to prevent leaking of sea water A into the ship and leaking of lubricating oil B outside the ship. In general, the pressure gas feeding mechanism 27 and leaked liquid recovery mechanism 28 are placed in operation .
during sealing. On the other hand, the lip seal member 17 and segment seal member 12 serve to prevent sea water A from leaking-in, and particularly, the segment seal member 12 is pushed by pressure gas ..
fed into the annular recess portion 11 at the rear thereof and strongly pressed against the sleeve 2 and case member 7 to enhance the seal effect of the seal portion. In addition, when pressure of the pressure gas is increased, the pressure gas passes ~hrough the seal portion and is conversely present in the space between the lip seal member 17 and segment .
. - 7 -~3 ~ 23~
seal member 12 or balanced with sea water pressure , in said space to display the seal eEfect. Furthermore, when the space is filled with pressure gas, back pressure is applied to the lip seal member 17 to place the lip seal member 17 in an idling state (the force in close contact with the sleeve 2 disappears) to prevent early wear, deformation or the like of .the member 17. In this case, the lip seal member -17 acts as a dust seal which prevents entry of foreign matter into the ship, but when pressure of pressure gas decreases, the lip seal member 17 is pressed by sea wat:er pressure into close contact with the sleeve 2 t~o automatically act as a first sea water resisting seal. Next, for the other lubricating oil B, the mechanical seal 20 acts as a first seal portion to;~prevent it from leaking-out, and even if the lubricating oil B should leak through the seal portion, leaking of the oil outside the ship could be c,ompletely cut off by the segment seal 12.
If the lubricating oil B enters the space between - the mechanical seal 20 and the segment seal portion 12, the oil passes through the seal portion of the segment seal member 12 and is recovered together with pressure gas invaded into the space into the ship by the leaked oil recovery mechanism 28, fo~
: - 8 -".~ .
, .. , ~ ' ' 13~2~4 reuse. The stern tube seal device constructed as descri`bed above can completely seal both sea water A and lubricating oil B in a manner as described above.
Next, a second embodiment of the present invention will be described with reference to Flg 2 In Fig. 2, the same reference numerals as those used in the above-described first embodiment (Fig. 1) designate the same members. That is, a reference numeral 2 designates a sleeve, 3 a ship body, 4 a propeller, 5, 6, 7 and 8 case members, 11 an annular recess portion, 12 and 12 segment seal members, 17 a lip seal member, 27 a pressure gas feeding mechanism, and 28 a leaked oil recovery mechanism.
A stern tube seal device 30 having these members is principally different from the device shown in the above-described first embodiment in the following. That is, a fifth case member 31 is fitted in the inner periphery of a shoulder of the ~
first case member 5, and a~second lip seal member , 32 is held and secured between both the members 5 and 31. A sixth case member 33 is further fitéed at the side of lubricating oil B of the fifth case member 31, and a third segment seal member 34 is mounted as a float seal member in a space between ~ 3~2~
both the members 31 and 33. The segment seal member .~ 34 is brought into close contact with the outer peripheral surface of the sleeve 2 by a garter spring 35 fitted in the outer periphery of the segment seal member and brought into close contact with the end ' of the fifth case member 31 by a coiled spring 36 '' to be stopped by a pin not shown with respect to the sixth case member 33. A pipe line of a second leaked liquid recovery mechanism 37, which is open to a space between the lip seal member 32 and segment seal member 34, is provided extending from the fifth . case member 31 to the first case member 5. The first and second leaked liquid recovery mechanisms 28 and 37 can provide the junction of pipe lines within the first case member 5 or ship body 3 to use in :
common of'an intake recovery device such as a pump.
The stern tube seal device 30 constructed as described above displays similar operation and effect in seal water A resisting seal to those of the above-described first embodiment. As for lubricat-ing oil B, the first seal portion is formed by the third segment.seal member 34 to assume the extremely .
reduced state even if lubricating oil leaking through the seal portion is present, and therefore, sufficient sealing can be achieved by the lip seal''me'mber 32!! ~
.
' "
~3~234~
without much difficulty to recover it into the ship ~by the leaked liquid recovery mechanism 37.
Next, a third embodiment will be described with reference to Fig. 3.
In this figure, a reference numeral 42 designates a shaft (including a sleeve slipped external-ly on the shaft) to left-hand of which is mounted a screw not shown. A case member 43 comprising first to fifth members 44, 45, 46, 47 and 48 is arranged in the outer periphery of the shaft 42 and fixed to a ship body 50 through a packing 49. A reference numeral 51 designates an outer lip seal which is located in the inner periphery of a hole of~the case member 43 and held between the first case member 44 and the second case member 45, the outer;lip seal having a pressure receiving surface 51a, which is fitted with a fastening ring 52, arranged opposite sea water A. A back-up ring portion 45a for controlling operation of the lip seal 51 is provided at the rear of the second case member 45 with respect to the ; lip seal 51. A reference numeral 53 designa;tes an inner lip seal held between the fourth case;member 47 and the fifth case member 48, the inner llp seal having a pressure receiving surface 53a, which is A ' fitted with a fastening ring 54, directed towards ~3~23'~
lubricating oil B which is opposite the outer lip sea~:Sl.:` A back-up ring portion 47a with respect to the lip seal 53 is provided in the inner periphery of the fourth case member 47. The inside diameter of the third case member 46 among the case member 43 is made greater than that of other four members 44, 45, 47 and 48, particularly the second and fourth case members 45 and 47, and an annular recess portion 55 is formed in the inner periphery of the third case member 46, the annular recess portion 55 being provided therein with a floating ring seal 56. This floating ring seal 56 is such that a knock-pin 57 projected on the fourth case member 47 engages a cut 56a formed in one end thereo-f to be stopped with respect to the case member 43 and both ends and an inner peripheral surface thereof are slightly distanced form the ends of the second and fourth case members 45 and 47 and the peripheral surface of the shaft 42 to form fine clearances 58, 59 and 60. The floating ring seal 56 is formed in its inner perlpheral.surface , with an annular groove 56b and provided with the required number of through-holes 56c which extend through the inner and outer peripheral surfaces.
A reference numeral 61 designates a feed line of pressure fluid in communication with the annular 13~23~
recess portion 55 partitioned by the floating ring seai `56`from the side of the ship body, which line extends through the third and fourth case members 46and 47to feed pressure fluid into the annular recess portion 55 from a fluid feed device (not shown) disposed within the ship. A reference numeral 62 designates a leaked liquid recovery line formed separately from the pressure fluid feed line 61, which recovery line is open to a space between the floating ring seal 56 and the internal lip seal 53 to recover leaked liquid entered the space into the ship by means of a pump or the like not shown.
In the stern tube seal device 41 constructed as described above, when pressure fluid is fed into the annular recess portion 55 from the pressure fluid feed line 61, the annular recess portion 55 and annular groove 56b of the floating ring seal 56 in communication with the recess portion 55 through the through-hole 56c are filled with pressure fluid, and the pressure fluid passes through the clearances 58, 59 and 60 and gradually flows into spaces 63 and 64. Among this pressure fluid, pressure fluid flowing into the space 63 between the external lip seal 51 and floating ring seal 56 is stored in the space 63 so as to act as back pressure with respect to the external ~3123~
lip seal 51 to lower a sliding load between the lip seal~ 51 and the peripheral surface of the shaft 42 and to prevent entry of sea water. In this case, it is considered that the pressure fluid might flow outside the ship~ depending on pressure, and therefore, it is desireable to select and use pressure fluid which poses no problem in terms of contamination of the sea, most preferably, air or the like. On the other hand, pressure fluid flown into the space between the internal lip seal 53 and the floating ring seal 56 is recovered into the ship from the leaked liquid recovery line 62 together with lubricating oil B leaked out of the internal lip seal 53, if any. In this manner, the floating ring seal 56 is possible to sufficiently perform a function as a secondary seal with respect to the lip seals 51 and ;
53 as far as pressure fluid is being fed. Even if feeding of pressure fluid is stopped for some reason, the floating ring seal 56 functions as a secondary seal of a limited leaking type to maintain the sealing effect to some extent in cooperation with the recovery mechanism by the leaked liquid recovery line 62.
Accordingly, in accordance with the seal device 41 constructed as described above, the external lip seal 51 is pressed at the rear surface by the pressure 13123ll~
fluid to lower the sliding load between the lip seal 51 and the peri.pheral surface of the shaft 42 to enhance the durality of the lip seal 51, which has been heretofore worn materially, to positively seal both sea water A and lubricating oil B and to recover the lubricating oil B into the ship through the leaked liquid recovery line 62, thus removing a fear of - contamination of the sea. Next, Fig. 4 shows an essential part of a fourth embodiment. That is, the floating ring seal 56 comprises a double type seal 65 whose rear surfaces are opposed. Both seal : members 66 and 67 are stopped for rotation by a common .knock-pin 68, and the required number of springs 6g are interposed between both the seal members 66 and 67. ~.
Next, a fifth embodiment of the present invention will be described with reference to Fig. 5.
In this figure, a reference numeral 72 designates a shaft (including a sleeve slipped external-ly on the shaft) to left-hand of which is mounted a screw not shown. A case member 73 comprising first to fifth members 74, 75, 76, 77 and 78 is arranged in the outer periphery of the shaft 72 and fixed to a ship body 80 through a packing 79. A reference numeral 81 designates an outer lip seal which is . - 15 -1~1 23~
located in the inner periphery of the hole of the case member 73 and held between the first case member 74 and the second case member 75, the outer lip seal having a pressure receiving surface 81a, which is fitted with a ~astening ring 82, arranged opposite sea water A. A back-up ring portion 75a for controlling operation of the lip seal 81 is provided at the rear of the second case member 75 with respect to the lip seal 81. A reference numeral 83 designates an inner lip seal held between the fourth case member 77 and the flfth case member 78, the inner lip seal having a pressure receiving surface 83a, which is fitted with a fastening ring 84, directed towards lubricating oil B which is opposite the outer lip seal 81. A back-up ring portion 77a with respect to the lip seal 83 is provided in the inner periphery of the fourth case member 77. The inside diameter of the third case member 76 among the case member 73 is made greater than that of other four members 74, 75, 77 and 78, particularly the second and fourth case members 75 and 77, and an annular recess portion 85 is formed in the inner periphery of the third case member 76. A reference numeral 86 designates a pressure type hollow ring made of rubber fitted into the annular recess portion 85j the hollow ring:' ~L3~234~
having a plurality (three shown in the figure) of annular crest portions 86acontinuously provided in the inner peripheral surface thereof, said crest portions 86a serving as a seal portion in contact with the shaft 72, and having the required number (two shown in the figure) of fine holes 86d bored to provide communication between a ~rough portion 86b, between the crest portions 86a, and a hollow portion 86c. A reference numeral 87 designates a pressure fluid feed line bored from the ship body side towards the hollow portion 86c of the pressure hollow ring 86 to feed pressure fluid into the hollow portion 86c from a fluid inlet device (not shown) disposed within the ship. A reference numeral 88 designates a leaked liquid recovery line formed separately from the pressure fluid feed line 87, which recovery line is open to a space between the pressureltype hollow ring 86 and the inner lip seal 83 to recover leaked liquid entered the space into the ship by means of a pump or the like not shown.
In the stern tube seal device 71 constructed as described above, when pressure fluid is fed into the hollow portion 86c of the pressure type hollow rlng 86 from the pressure fluid feed line 87, the pressure fluid is filled into the hollow portion~
!
~31 ~34~
86c, passes through the fine holes 86d and filled into a space of a ;~riangular section surrounded by inclined surfaces of ~he adjacent two crest portions 86a and the peripheral surface of the shaft 72 whereby pressure is balanced by the space and hollow portion 86c to bring the pressure type hollow ring 86 into contact with the shaft 72 under the condition of low load. When pressure fluid is further fed, the pressure fluid breaks a seal portion between the pressure type hollow ring 86 and the shaft 72 and flows into the spaces 89 and 90. Pressure fluid flown into the space 89 between the outer lip seal 81 and the pressure type hollow ring 86 is stored in the space 89 to act as back pressure with respect to the outer lip seal 81, thus lowering the sliding load between the lip seal 81 and the peripheral surface of the shaft 72 and prevent entry of sea water A.
In this case, it is considered that the pressure .
fluid might spread the lip seal 81 and flows outside -the ship depending on pressure, and therefore, it ;
is desireable to select and use pressure fluid which .
poses no problem in terms of contamination of the sea, for example, such as compressed air. On the other hand, pressure fluid flown into the space 90 between the internal lip seal 83 and the pressure ~ ; ' ~ - 18 -1~23~
type hollow ring 86 is recovered into the ship from the leaked liquid recovery line 88 together with lubricating oil B leaked out of the internal lip seal 83, if any. In this manner, the pressure type hollow ring 86 is possible to sufficiently perform a function as a secondary seal with respect to the lip seals 81 and 83 as far as pressure fluid is being fed. Even if feeding of pressure fluid is stopped for some reason, the hollow rlng functions as a secondary seal of a llmlted leaking type to malntain the sealing effect to some extent in cooperation with the function of the leaked llquld recovery line 88. Accordingly, in accordance with the seal device 71 constructed as described above, the external llp seal 81 is pressed at the rear surface by the pressure fluid to lower the sliding load between the lip seal 81 and the peripheral surface of the shaft 72 to enhance the durablity of the lip seal 81, which has been heretofore worn materially, to positively seal both sea water A and lubricating oil B and to recover the lubricating oil B into the ship through the leaked liquid recovery line 88, thus removing a fear of contamination of the sea. Next, Flg. 6 shows an essential;part of a slxth embodiment. That ls, the inner peripheral portion 86e of the pressure typè `
.
, ~' .
~312~
hollow ring 86 is formed of synthetic rubber or fluoro-re~in which is~excellent in wear resis~ance to enhance ~ R~p6~
the wear ~e~r~e.
~ - Next, a seventh embodiment of the present invention will be described with reference to Fig. 7.
In ~ig. 7, the stern tube seal device general-ly indicated at 101 is mounted in an opening of a hole of a ship body 103 so as to seal between a sleeve 102 fitted externally of a shaft (not shown) and a ship body lQ3 in which the shaft is inserted.
A reference numeral 10~ designates a part of a propeller ' mounted on the extreme end of the shaft. In the stern tube seal deivce 101, a reference numeral 105 designates a first casing fixed to the end of the ship body 103 through a gasket 106, and on the side of sea water A of the first casing 105, a second cas,ing (adapater ring) 107 and a third casing (aft cover) are airtightly fixed by suitable 0-rings 109 or the like. In the inner peripheral surface of the second caseing 107, an annular recess portion llO is formed by t~e second casing 107 and the first casi~g lOS at the side of the ship, the annular recess portion 110 having a segement seal 111 as a limited leaking type seal mounted therein. This segment seal 111, which are circumferentially divided into ~12~
plural portions, is fastened by a garter spring 112 fitted in the outer periphery thereof and ls slidably moved in close contact with the peripheral surface of the sleeve 102 and brought into close contac~ $
with a wall surface 107a of the second casing 107 ~ , -by a coiled spring 113 disposed at the side of`~ip.
The divided elements of the segement seal 111 are ~ `
stopped to be rotated against the casings 105 a~d 107 by means of pins not shown projected from the first or second casing 105, 107. A reference numeral 114 designates a lip seal held and secured between~
the second and third casings 107 and 108, the lip .
seal having a pressure receiving surface 114a fast~ened !; .
by a garter spring 115 directed towards sea water ~, and being slidably moved in close contact with the .
~ ~: outer periphery of the sleeve 102. A back-up ring : , portion 107b for controlling excessive deformation ~
of the~lip seaI 114 is provided on the back of the .
lip seal 114 of the second casing 107. A reference ~
numeral 116 designates a mechanical seal arranged .
~ :
. ~ at a position closer to lubricating oil B in the nner periphery of~a~hole of the first casing lOS,;
which seal is fitted in a shoulder of the first casing 105 and maintained.airtight by an 0-ring 118. The . ~ mechanical seal comprises a sliding ri~g 117 at t~he~ .
:
1312~
fixed side stopped for rotation against the casing 105 by means of a pin not shown, a cover ring 119 fixed to the sleeve 102 by means of a pin uot shown and a sliding ring 120 at the rotational side rotated as the shaft stopped for rotation by means of a pin not shown rotates. The sliding ring 120 at the rotational side is pressed by a coiled spring 121 to form a sealed slidtng surface 122 in the surface in contact with the sliding ring 117 at the fixedi'~
side. A reference numeral 113 designates a pressure fluid feed line for feeding pressure fluid from the side of the ship body 103 towards a space 124 of an annular hole formed between the segment seal 111 and the mechanical seal 116, wherein a p~pe line open to the spacethrough the first casing 105 from .
the ship body 103 is arranged, and a feed device not shown is provided within the ship body 103.
The stern tube seal device 101 constructed as described above is designed to prevent entry of sea water and~slurry contained ln sea water into the~mechanical seal 116 by the llp seal 114 arraneed externally of the mechanical seal 116 (on the s~ea water side), the segment seal 111 and the pressu~e fluid. It is noted;that durine sealing, as a rule, the feed device is actuated to feed pressure fluid.
: : ~
~ 22 -.
' :
~31234~
That is, Eirst, the lip seal 114 and segment seal l~ll serve to p~event entry of sea water A, and particularly, the segmen-t seal 111 is pressed against the peripheral surface oE the sleeve 102 and the wall surface 107a of the second casing 107 to enhance the sealing effect. When pressure of pressure fluid exceeds a certain level with respect to the segment seal 111 which is of a limited leaking type, the pressure fluid flows towards the lip seal 114 conversely but the pressure fluid is also balanced with sea water pressure to exhibit the sealing effect. When the space between the lip~seal 114 and segment seal 111 is filled with pressure fluid, back pressure is applied to the lip seal 114 by the pressure fluid . , .
to place the lip seal 114 in an idling state balanced with sea wa-er pressure thereby preventing early wear, de~formation or the like due to the sliding contact between the lip seal 114 and sleeve 102.
.
The lip seal 114 also acts as a dust seal which prevents entry of foreign matter into the ship, but when pre6sure`
:, :
of pressure fluid a-t the rear decreases for some reason, the~lip seal is pressed by sea water pressure into close contact with the sleeve 102 to automatically act as a first sea water resisting seal. It is noted ~ that the pre66Ure fluid mlght spread the llp seal ; - 23 -, ::
~ .
13~23~
114 depending on pressure and Elows outside the ship, and~therefore, air, nitrogen gas, clean water or the like which involves no problem such as public hazards even if the fluid leaks into sea water are desirable for use. On the other hand, lubricating oil B can be completely sealed by the mechanical seal 116 which has been increased in durable sealing properties by the above-described structure.
~ ext, Figs. 8 to 10 show modified embodiments of the present invention in which in place of a~segment seal of a limited leaking type seal described in the previous embodiment, an integral type (which is not divided peripherally) floating ring seal 125 (Fig. 8), anend type rubber seal 127 (Fig. 9) or a hollow type pressure ring 130 (Fig. 10) is used.
That is, a floating ~ing seal 125 shown in Fig. 8 is s-topped for rotation by means of a pin (not shown) mounted on the first or second casing 105, 107 and pressed by a coiled spring 126 in contact with the wall surface 107a of the second casing 107 and has a fine clearance relative to the peripheral surface of the sleeve 102 to seal pressure fluid in a!manner of limited leaking type. ~n end type rubber seal 127 shown in Fig. 9 is slipped over the sleeve 102 by a garter spring 128 to form a sealed sliding surface ~ - 24 -~3~23~ -relative to the wall surface 107a of the second casing 1'07`to seal fluid by said surface. A flushing line 129 is open to an annular groove 127a formed in said surface from the second casing 107. This flushing line is branched from the pressure fluid feed llne 123, and clean water is used as a feed fluid to thereby provide lubrication for the sliding surface. A hollow type pressure ring 130 shown in Fig. 10 is mounted in close contact with the first and second casings 105 and 107 as if filled in the annuar recess portion 110, and is branched from the pressure fluid feed line 123 relative to the hollow portion 130a or fed with pressure air fro~ a line 131 separately provided so that it is e~panded in a direction of inside diameter to come into close slidable contact with ~he peripheral surface of the sleeve 102. Use ~ `
of the pressure type hollow rlng 130 enables to vary~
the state oI close contact wit`h the peripheral surface of the sleeve 102 by controIllng a feed amount of the pressur~e alr to adjust a leaking amount of the pressure fluld. ~n~inner~peripheral surface portion ;;of the hollow ring~130, whlch is normally formed~
of synthetic rubber or the like, can be formed of a sliding material such as fluororesin to thereby~
enhance th~e~wear reslstance.;
:, : ~ . :
~ 25 -'~ ~ ' ' ''.' ~ 3~2~
In the stern tube seal device oE the present invention, ~enerally, a segment seal member, a lip seal member, a mechanical seal and the like constltute a multiple stage seal portion, and pressure of pressure fluid is utili~ed, as described above. Therefore, not only the excellent sealing performance with~respect to both sea water and lubricating oil is displayed but also the lip seal or the like arranged closer to sea water can be relieved in burden by the pressure of pressure fluid or to prevent damages given to a mechanical seal, thus enhancing the long-period durability of the whole device. ~oreover, according to the stern tube seal device of the present invention, contamination of the sea can be prevented to effectively cope with various problems ln contamination which has been recently raised as an international problem.
While the preferred embodiments of the ~ ;
present invention have been described, it will be apparent that the present invention can be variously;~
modified without departing the princlple thereof.
It is therefore desired that all the modifications, by~which the ef~ects of the present invention~are obtained substant~ially through the use of substantially identical or corresponding structures, are included ~
in the category of the present invention by the appended clalms. ~ ~ -: : , :
. ~' ' ~
, .
Claims (16)
1. A stern tube seal device characterized in that a plurality of annular case members are arranged in the outer periphery of a shaft, an annular recess portion is provided in the inner peripheral surface of a hole of said case members, a segment seal member is arranged within said annular recess portion, a feeding mechanism is provided to feed pressure gas to said annular recess portion closed by said segment seal member, a lip seal member is arranged at the sea water side of said segment seal member, and a mechanical seal, packings or other float seal member are arranged at the lubricating oil side thereof.
2. A stern tube seal device for providing a seal about a rotatable shaft, comprising an annular casing means disposed about the outer periphery of a rotatable shaft, a pair of spaced lip seal means mounted in said casing means and engaging said shaft, said casing means having a recess intermediate said pair of spaced lip seal means, a resilient ring seal means disposed in said recess, and pressure fluid feed line means feeding pressure fluid to said ring seal means, said ring seal means comprising a resilient ring member having a hollow interior, said pressure fluid feed line means feeding pressure fluid to said hollow interior, said ring member having generally V-shaped portions juxtaposed to said shaft and forming troughs therebetween, said ring member having passages for passing said pressure fluid from said hollow interior to said troughs.
3. A stern tube seal device according to claim 2 wherein said resilient ring member is made of rubber.
4. A stern tube seal device for providing a seal about a rotatable shaft, comprising an annular casing means disposed about the outer periphery of a rotatable shaft, a pair of spaced lip seal means mounted in said casing means and engaging said shaft, said casing means having a recess intermediate said pair of spaced lip seal means, a resilient ring seal means disposed in said recess, and pressure fluid feed line means feeding pressure fluid to said ring seal means, said ring seal means comprising a resilient ring member having a hollow interior, said resilient ring member having an inner peripheral portion made of a wear-resistant material.
5. A stern tube seal device according to claim 4 wherein said wear-resistant material is fluoro-resin.
6. A stern tube seal for providing a seal about a rotatable shaft which extends from the stern tube of a ship comprising and annular casing means disposed about the outer periphery of a rotatable shaft, said casing having a recess extending about said shaft, a resilient ring member disposed in said recess, said ring member having a hollow interior space, a first conduit means in said casing means for receiving fluid under pressure from the interior of said ship, said first conduit means communicating with said hollow interior space, said ring member having at least one generally V-shaped portion juxtaposed to said shaft and forming a trough, said ring member having passage for passing said pressure fluid from said hollow interior to said trough, a first and second seal means mounted on said casing means on opposite sides of said recess, a second conduit means in said casing means for recovering and returning said fluid to said ship, said second conduit means having an inlet opening in said casing means between said recess and said first seal means, said second seal means having an engaging portion engaging said shaft and a sloping portion extending from said engaging portion, said sloping portion sloping radially outwardly as said recess is approached such that fluid under pressure from said first conduit means communicates with said second seal means via said outer clearance space, said passage means and said inner clearance space acting on said sloping portion of said second seal means to reduce the pressure with which said engaging portion of said second seal means engages said shaft to thereby reduce the sliding load between said second seal means and said shaft.
7. A stern tube seal according to claim 6 further comprising a fastening ring fastening said second seal means about said shaft.
:
:
8. A stern tube seal according to claim 6, wherein said sloping portion of said second seal means comprises a frusto-conical surface, one end of said frusto-conical surface being defined by a first circular end and the other end being defined by a second circular end, said first circular end being of a larger diameter than said second circular end, said first circular end being disposed closer to said recess than said second circular end, said second circular end having a diameter substantially equal to the diameter of said shaft.
9. A stern tube seal according to claim 8, wherein said frusto-conical surface is a pressure surface exposed to the pressure of said fluid, whereby the pressure of the fluid acting on said pressure surface has a radially outwardly directed force component which reduces the load between said second seal means and said shaft.
10. A stern tube seal device characterized in that an annular case member is arranged in the outer periphery of a shaft, a mechanical seal for sealing a portion between said case member and the peripheral surface of the shaft is disposed at a position adjacent to the ship in the inner periphery of said case member, an annular recess portion is formed externally of the ship and of said mechanical seal in the inner peripheral surface of said case member, a limited leaking type seal in sliding relation with the peripheral surface of the shaft is fitted into said annular recess portion, and a pressure fluid feed line, which is open to an annular space between said limited leaking type seal and said mechanical seal, and feeding pressure fluid to said annular space, is provided.
11. A stern tube seal for providing a seal about a rotatable shaft which extends from the stern tube of a ship comprising an annular casing means disposed about the outer periphery of a rotatable shaft, said casing having a recess extending about said shaft, said recess having an outer radial recess surface, a floating ring member disposed in said recess, said floating ring member having an outer radial ring surface and an inner radial ring surface, said outer radial ring surface being spaced from said outer radial recess surface to form an outer clearance space therebetween, said inner radial ring surface being spaced from said shaft to form an inner clearance space therebetween, said ring member having passage means extending between said inner and outer clearance spaces, a first conduit means in said casing means for receiving fluid under pressure from the interior of said ship, said first conduit means communicating with said outer clearance space, a first and second seal means mounted on said casing means on opposite sides of said recess, a second conduit means in said casing means for recovering and returning said fluid to said ship, said second conduit means having an inlet opening in said casing means between said recess and said first seal means, said second seal means having an engaging portion engaging said shaft and a sloping portion extending from said engaging portion, said sloping portion sloping radially outwardly as said recess is approached such that fluid under pressure from said first conduit means communicating with said second seal means via said outer clearance space, said passage means, and said inner clearance space acts on said sloping portion of said second seal means to reduce the pressure with which said engaging portion of said second seal means engages said shaft to thereby reduce the sliding load between said second seal means and said shaft.
12. A stern tube seal according to claim 11 further comprising a groove formed in said inner radial ring surface of said ring member.
13. A stern tube seal according to claim 11 further comprising a fastening ring fastening said second seal means about said shaft.
14. A stern tube seal according to claim 11 wherein said sloping portion of said second seal means comprises a frusto-conical surface, one end of said frusto-conical surface being defined by a first circular end and the other end being defined by a second circular end, said first circular end being of a larger diameter than said second circular end, said first circular end being disposed closer to said recess than said second circular end, said second circular end having a diameter substantially equal to the diameter of said shaft.
15. A stern tube seal according to claim 14, wherein said frusto-conical surface is a pressure surface exposed to the pressure of said fluid, whereby the pressure of the fluid acting on said pressure surface has a radially outwardly directed force component which reduces the load between said second seal means and said shaft.
16. A stern tube seal for providing a seal about a rotatable shaft which extends from the stern tube of a ship comprising an annular casing means disposed about the outer periphery of a rotatable shaft, said casing having a recess extending about said shaft, said recess having two recess end faces extending perpendicular to the axis of said shaft and an outer radial recess surface extending between said two recess end faces, a floating ring member disposed in said recess, said floating ring member having two ring end faces extending perpendicular to the axis of said shaft, each of said ring end faces being spaced from the respective recess end face to form lateral clearance spaces between said recess end faces and said ring end faces, said floating ring member having an outer radial ring surface and an inner radial ring surface, said outer radial ring surface being spaced from said outer radial recess surface to form an outer clearance space therebetween, said inner radial ring surface being spaced from said shaft to form an inner clearance space therebetween, said ring member having passage means extending between said inner and outer clearance spaces, a first conduit means in said casing means for receiving fluid under pressure from the interior of said ship, said first conduit means communicating with said outer clearance space, a first and second lip seal means mounted on said casing means on opposite sides of said recess, a second conduit means in said casing means for recovering and returning said fluid to said ship, said second conduit means having an inlet opening in said casing means between said recess and said first lip seal means, each of said first and second lip seal means having an engaging portion engaging said shaft and a sloping portion extending from said engaging portion, said sloping portion sloping radially outwardly as said recess is approached such that fluid under pressure from said first conduit means communicating with said second lip seal via said outer clearance space, said passage means, and said inner clearance space acts on said sloping portion of said second lip seal means to reduce the pressure with which said engaging portion of said second lip seal means engages said shaft to thereby reduce the sliding load between said second lip seal means and said shaft.
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983058717U JPS59165300U (en) | 1983-04-21 | 1983-04-21 | Stern tube shaft sealing device |
| JP83/58717 | 1983-04-21 | ||
| JP1983148207U JPS6055600U (en) | 1983-09-27 | 1983-09-27 | Stern tube shaft sealing device |
| JP1983148206U JPS6055599U (en) | 1983-09-27 | 1983-09-27 | Stern tube shaft sealing device |
| JP83/148207 | 1983-09-27 | ||
| JP83/148206 | 1983-09-27 | ||
| JP83/165490 | 1983-10-28 | ||
| JP16594083U JPS6073972U (en) | 1983-10-28 | 1983-10-28 | Stern tube shaft sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1312344C true CA1312344C (en) | 1993-01-05 |
Family
ID=27463676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000452497A Expired - Fee Related CA1312344C (en) | 1983-04-21 | 1984-04-19 | Stern tube seal device |
Country Status (8)
| Country | Link |
|---|---|
| KR (1) | KR860001696B1 (en) |
| CA (1) | CA1312344C (en) |
| DE (1) | DE3413527A1 (en) |
| FR (1) | FR2544828B1 (en) |
| GB (1) | GB2140880B (en) |
| IT (1) | IT1179918B (en) |
| NO (1) | NO841210L (en) |
| SE (1) | SE457012B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3502395A1 (en) * | 1985-01-25 | 1986-07-31 | Howaldtswerke - Deutsche Werft AG Hamburg und Kiel, 2300 Kiel | SEALING ARRANGEMENT FOR A PROPELLER SHAFT |
| DE3815655C2 (en) * | 1988-05-07 | 1994-04-14 | Blohm Voss Ag | Sealing for rotating shafts, especially stern tube sealing |
| GB2333331A (en) * | 1997-12-31 | 1999-07-21 | Lewis Patrick | A marine propeller shaft seal |
| JP2002340199A (en) * | 2001-05-11 | 2002-11-27 | Eagle Ind Co Ltd | Stern pipe shaft seal device |
| US20050206088A1 (en) * | 2004-03-16 | 2005-09-22 | Anderson James H | Bearing seal with backup device |
| DE102010027757B4 (en) * | 2009-12-18 | 2015-12-10 | Von Ardenne Gmbh | Feedthrough for a machine element |
| SG188496A1 (en) * | 2010-09-29 | 2013-05-31 | Waertsilae Finland Oy | An arrangement, a sealing assembly, a casing flange and a spacer for sealing the propeller shaft of a marine vessel |
| DE102011119181A1 (en) * | 2011-11-23 | 2013-05-23 | Robert Bosch Gmbh | Cylinders, in particular hydraulic cylinders for the deep sea |
| DE102012004443A1 (en) | 2012-02-29 | 2013-08-29 | Blohm + Voss Industries Gmbh | Ship with a bulkhead seal in the area of shaft passages |
| DE102015209428B4 (en) | 2015-05-22 | 2023-01-05 | Aktiebolaget Skf | Sealing arrangement for sealing a space between a housing and a component against a liquid medium and turbine hub |
| GB2554688B (en) * | 2016-10-04 | 2020-01-29 | Skf Ab | Seal assembly for sealing a space between a housing and a component against entry of a liquid medium |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB811270A (en) * | 1958-01-28 | 1959-04-02 | Allis Chalmers Mfg Co | Improved fluid sealing device |
| GB1025384A (en) * | 1962-04-25 | 1966-04-06 | Nat Res Dev | Improvements in or relating to seals |
| CH453015A (en) * | 1966-06-17 | 1968-05-31 | Bbc Brown Boveri & Cie | Floating ring seal |
| CH470612A (en) * | 1968-01-25 | 1969-03-31 | Bbc Brown Boveri & Cie | Floating ring seal |
| US3815926A (en) * | 1971-04-27 | 1974-06-11 | Improved Machinery Inc | Low friction sealing means |
| US3834715A (en) * | 1972-04-26 | 1974-09-10 | Dart Ind Inc | Pressure seal assembly |
| FR2239158A5 (en) * | 1973-07-25 | 1975-02-21 | Cefilac | Shaft seal for vacuum or press. housing - has inflatable ring bearing on fixed and rotating contact surfaces |
| GB1571342A (en) * | 1976-02-17 | 1980-07-16 | Forsheda Gummifabrik Ab | Shaft sealing arrangement |
| DE2625153C2 (en) * | 1976-06-04 | 1983-07-14 | Leybold-Heraeus GmbH, 5000 Köln | Shaft seal |
| US4085941A (en) * | 1976-06-11 | 1978-04-25 | Crane Packing Limited | Stern seals for ships |
| US4094512A (en) * | 1976-07-14 | 1978-06-13 | Crane Packing Limited | Shaft seals |
| US4078809A (en) * | 1977-01-17 | 1978-03-14 | Carrier Corporation | Shaft seal assembly for a rotary machine |
| DE2746592A1 (en) * | 1977-10-15 | 1979-04-19 | Howaldtswerke Deutsche Werft | Seal for ship's propeller shaft - has two axially spaced lips controlled by lubricant at pressure greater than water pressure |
| DE2925244C2 (en) * | 1979-06-22 | 1982-09-30 | Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel | Sealing arrangement for stern tube systems |
| US4305592A (en) * | 1979-10-23 | 1981-12-15 | Transamerica Delaval, Inc. | Gas seal bushing |
| DE3045855A1 (en) * | 1980-12-05 | 1982-07-08 | Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel | SEALING ARRANGEMENT FOR ROTATING SHAFTS |
| DE3122407A1 (en) * | 1981-06-05 | 1982-12-23 | Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel | Lubricating system, in particular for a rear stern tube seal |
| DE3143866A1 (en) * | 1981-11-05 | 1983-05-11 | Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel | SEALING ARRANGEMENT WITH A RADIAL SLIDING RING |
-
1984
- 1984-03-27 NO NO841210A patent/NO841210L/en unknown
- 1984-04-05 GB GB08408850A patent/GB2140880B/en not_active Expired
- 1984-04-05 FR FR848405350A patent/FR2544828B1/en not_active Expired
- 1984-04-10 DE DE3413527A patent/DE3413527A1/en active Granted
- 1984-04-18 KR KR1019840002032A patent/KR860001696B1/en not_active IP Right Cessation
- 1984-04-18 SE SE8402189A patent/SE457012B/en not_active IP Right Cessation
- 1984-04-18 IT IT67395/84A patent/IT1179918B/en active
- 1984-04-19 CA CA000452497A patent/CA1312344C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2140880B (en) | 1986-12-10 |
| SE8402189L (en) | 1984-10-22 |
| FR2544828A1 (en) | 1984-10-26 |
| IT8467395A0 (en) | 1984-04-18 |
| DE3413527C2 (en) | 1989-12-21 |
| KR840008483A (en) | 1984-12-15 |
| FR2544828B1 (en) | 1989-03-17 |
| KR860001696B1 (en) | 1986-10-17 |
| NO841210L (en) | 1984-10-22 |
| IT8467395A1 (en) | 1985-10-18 |
| SE8402189D0 (en) | 1984-04-18 |
| IT1179918B (en) | 1987-09-16 |
| GB2140880A (en) | 1984-12-05 |
| GB8408850D0 (en) | 1984-05-16 |
| SE457012B (en) | 1988-11-21 |
| DE3413527A1 (en) | 1984-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4534569A (en) | Stern tube seal device providing a seal about a rotatable shaft | |
| AU637462B2 (en) | Improvements in barrier seal systems | |
| CA1312344C (en) | Stern tube seal device | |
| US4602806A (en) | Seal construction for fluid swivel joints incorporating a free-floating anti-extrusion device with oil injection system | |
| US6039320A (en) | Adjustable seal for propeller drive shaft | |
| US8505924B2 (en) | Rotary shaft sealing assembly | |
| US4448425A (en) | Shaft seal assembly with inflatable annular member | |
| US6109617A (en) | Gas seal assembly and method of sealing | |
| US5813674A (en) | Reverse pressure tolerant seal means | |
| US3934952A (en) | Leakproof seal for bearings | |
| JPH04231774A (en) | Sealing device to rotatory shaft | |
| US5071318A (en) | Reactor coolant pump having improved dynamic secondary seal assembly | |
| US5409240A (en) | Seal with self-lubricating contact surface | |
| EP0232178A2 (en) | A fitting for use in a pressurised fluid line | |
| US4482159A (en) | Stern tube seal device | |
| US4461487A (en) | Stern tube seal | |
| US4482158A (en) | Stern tube seal device | |
| EP1256518A2 (en) | Stern tube shaft sealing apparatus | |
| JP2909948B2 (en) | Stern tube shaft sealing device | |
| EP0411804A1 (en) | Seals | |
| JPS61236970A (en) | Shaft sealing device and automatic circulating lubricating system thereof | |
| JPH0710084A (en) | Stern tube shaft sealing device | |
| JPS6317897Y2 (en) | ||
| GB2155120A (en) | Mechanical face seal | |
| JP2000018144A (en) | Shaft water seal system of hydraulic machine and assembling method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |