JP6215720B2 - Stern tube sealing device and ship equipped with the same - Google Patents

Description

  The present disclosure relates to a stern tube sealing device provided on an outer periphery of a propeller shaft of a ship and a ship including the stern tube sealing apparatus.

  Conventionally, a stern tube sealing device has been used in which a plurality of seal rings are attached to the outer periphery of a propeller shaft that extends from the stern tube to the outside of the boat and is connected to the propeller in the axial direction of the propeller shaft. reference). In this stern tube sealing device, a plurality of seal rings are disposed on an outer peripheral surface of a liner fitted on a propeller shaft, and are defined by a seal ring and another seal ring adjacent to the propeller shaft in the axial direction of the seal ring. The lubricating oil is stored in the annular space. Of the multiple seal rings, the stern side seal ring prevents outboard seawater from flowing into the stern tube, and the bow side seal ring prevents lubricant in the stern tube from flowing into the engine compartment. Yes.

Japanese Patent No. 4109374

  In this conventional stern tube sealing device, since the seal ring is in sliding contact with the liner during rotation of the propeller shaft, frictional heat is generated in the portion of the seal ring that is in sliding contact with the liner to raise the temperature of the seal ring. Therefore, the seal ring may deteriorate and the life of the seal ring may be shortened.

  On the other hand, the frictional heat that raises the temperature of the seal ring is absorbed by the lubricating oil stored in the annular space, but there is a limit in absorbing all the frictional heat with the lubricating oil. In particular, development of a new structure of a stern tube sealing device equipped with a seal ring that can be used for a long period of time is desired in order to keep the replacement cost of a seal ring that is a replacement part low. It is also desired to provide a ship equipped with a stern tube sealing device having this new structure.

  In view of the above circumstances, at least some embodiments of the present invention have an object to provide a stern tube sealing device including a seal ring that can be used for a long period of time and a ship including the stern tube sealing device.

A stern tube sealing device according to some embodiments of the present invention includes:
A plurality of seal rings that are in sliding contact with the outer peripheral surface of a liner that is externally fitted to a propeller shaft that is coupled to a propeller that is mounted on the stern of the ship;
Lubricating oil stored in an annular space defined by the seal ring and another seal ring adjacent in the axial direction of the propeller shaft of the seal ring;
A metal heat conduction member provided on at least one of the seal side surface of the seal ring on the annular space side or the surface facing the seal side surface of the backup ring that supports the seal ring from the annular space side. Yes.

  According to the stern tube sealing device, when the propeller shaft rotates, frictional heat is generated from the portion of the seal ring in sliding contact with the outer periphery of the liner. Part of this frictional heat is absorbed by the lubricating oil, and part of the remaining frictional heat raises the temperature of the seal ring, but part of the frictional heat transmitted to this seal ring is radiated through the heat conducting member. . For this reason, most of the heat that raises the temperature of the seal ring without being absorbed by the lubricating oil can be dissipated through the heat conducting member. For this reason, the seal ring can be effectively cooled, deterioration of the seal ring due to the temperature rise of the seal ring is suppressed, and the life of the seal ring can be extended. Therefore, it is possible to provide a stern tube sealing device including a seal ring that can be used for a long time.

In some embodiments,
The stern tube sealing device is
A metal housing that is fitted on the liner and holds the plurality of seal rings is provided.

  In this case, the heat capacity of the metal housing is relatively large. For this reason, when a part of frictional heat is transmitted to the metal housing through the heat conducting member while the seal ring is held in the metal housing, the metal housing absorbs a lot of frictional heat. Can do. For this reason, a seal ring can be cooled effectively. Therefore, it is possible to realize a stern tube sealing device including a seal ring that can withstand longer-term use.

In some embodiments,
When the seal ring is held by the metal housing, the metal heat conduction member directly contacts the housing.

  In this case, since a part of frictional heat can be directly transmitted from the heat conducting member to the metal housing, the frictional heat can be effectively radiated. Therefore, it is possible to realize a stern tube sealing device including a seal ring that can withstand longer-term use.

In one embodiment,
The seal ring is
A key portion mounted on the housing;
An arm portion extending from the key portion toward the propeller shaft and extending along the axial direction of the propeller shaft;
A lip portion formed at a tip portion of the arm portion and having a sliding contact portion that is in sliding contact with the outer peripheral surface of the liner,
The metal heat conduction member is configured to be formed in at least a part of the seal side surface of the seal ring on the annular space side excluding the sliding contact portion.

  In this case, since the metal heat conducting member is formed in at least a part of the area of the seal side surface excluding the sliding contact portion, the properties (sealability and wear resistance) that the seal ring should originally have are impaired. In addition, the temperature rise of the seal ring due to frictional heat can be suppressed. For this reason, the contact of the lip portion with the propeller shaft is maintained in an appropriate state in which leakage and early abnormal wear do not occur, and the seal ring can be cooled. Therefore, it is possible to realize a stern tube sealing device including a seal ring that can withstand longer use while maintaining sealing performance.

In one embodiment,
The backup ring is formed integrally with the heat conducting member,
The backup ring and the heat conducting member are made of a pure metal or alloy containing any of silver, copper, gold, aluminum, and tungsten.

  In this case, since the backup ring and the heat conducting member are made of pure metal or alloy containing any of silver, copper, gold, aluminum, and tungsten, the frictional heat generated in the seal ring is effectively used as the backup ring and heat. Heat can be transmitted to the conductive member. Therefore, a stern tube sealing device having a seal ring that can withstand long-term use can be realized.

In one embodiment,
The heat conducting member is provided on the surface of the backup ring,
A plurality of concave and convex portions are provided on the inner peripheral surface of the backup ring that faces the outer peripheral surface of the liner.

  In this case, the frictional heat is transmitted to the backup ring via the lubricating oil, but since the plurality of uneven portions are provided on the inner peripheral surface of the backup ring, the heat transfer area of the backup ring is expanded by the uneven portions. can do. For this reason, the amount of frictional heat absorbed by the backup ring can be increased. Therefore, the effect of cooling the seal ring via the lubricating oil is further improved. Therefore, a stern tube sealing device having a seal ring that can withstand long-term use can be realized.

Ships according to some embodiments of the present invention are:
A propeller mounted on the stern;
A propeller shaft coupled to the propeller;
A stern tube sealing device for preventing inflow of seawater existing on the radially outer side of the propeller shaft and outflow of lubricating oil in the ship, and
The stern tube sealing device is
A plurality of seal rings that are in sliding contact with the outer peripheral surface of the liner that is externally fitted to the propeller shaft;
The lubricating oil stored in an annular space defined by the seal ring and another seal ring adjacent in the axial direction of the propeller shaft of the seal ring;
A metal heat conduction member provided on at least one of a seal side surface of the seal ring on the annular space side or a surface of the backup ring that supports the seal ring from the annular space side that faces the seal side surface. Configured.

  According to the marine vessel, when the propeller shaft rotates, frictional heat is generated from a portion that is in sliding contact with the outer periphery of the liner of the seal ring. Part of this frictional heat is absorbed by the lubricating oil, and part of the remaining frictional heat raises the temperature of the seal ring, but part of the frictional heat transmitted to this seal ring is radiated through the heat conducting member. . For this reason, most of the heat that raises the temperature of the seal ring without being absorbed by the lubricating oil can be dissipated through the heat conducting member. For this reason, the seal ring can be effectively cooled, deterioration of the seal ring due to the temperature rise of the seal ring is suppressed, and the life of the seal ring can be extended. Therefore, a ship provided with the stern tube sealing device having a seal ring that can be used for a long time can be provided.

  According to at least some embodiments of the present invention, it is possible to provide a stern tube sealing device including a seal ring that can be used for a long period of time and a ship including the stern tube sealing device.

It is an internal structure figure which shows the structural example of a stern tube sealing apparatus and a ship provided with the same. It is sectional drawing of the annular part of the seal ring concerning one Embodiment. It is a partial internal structure figure of a stern tube sealing apparatus provided with the backup ring provided close to the seal ring concerning one Embodiment. It is a partial internal structure figure of the stern tube sealing apparatus with which the heat conductive member concerning one Embodiment was provided over the perimeter of the seal ring. It is a partial internal structure figure of the stern tube sealing apparatus in which the uneven | corrugated | grooved part was provided in the internal peripheral surface of the backup ring concerning one Embodiment. It is a fragmentary sectional view equivalent to IV-IV arrow of the backup ring shown in Drawing 4 concerning one embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a stern tube sealing device of the present invention and a ship provided with the same will be described with reference to the accompanying drawings. However, the materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples. First, before describing the ship of the present invention, a stern tube sealing device provided in the ship will be described.

  As shown in FIG. 1 (internal structure diagram), the stern tube sealing device 1 is attached to the propeller shaft 5 with the propeller 3 connected to the end, and the stern S outside the stern S, and is installed in the stern S. A housing 9 through which the propeller shaft 5 extending from the stern tube 7 to the outside of the boat is inserted, a plurality of seal rings 11 for sealing between the inner peripheral side of the housing 9 and the outer peripheral side of the propeller shaft 5, and a seal ring 11 and lubricating oil 15 stored in an annular space 13 defined by another seal ring 11 adjacent in the axial direction of the propeller shaft 5 of the seal ring 11.

  The stern tube 7 has its stern side end fixed to the stern S by fastening means such as a bolt 17, and the stern tube 7 has a bow side end extending to the bow side in the stern S and fixedly supported. The propeller shaft 5 is supported in a state of being inserted into the stern tube 7 and extending out of the ship. A propeller 3 is provided at the end of the propeller shaft 5 that extends to the outside of the ship. The propeller 3 is fixed to a liner 19 that is fitted on the outer periphery of the propeller shaft 5. For this reason, the propeller 3 rotates integrally with the propeller shaft 5. The propeller shaft 5 rotates upon receiving power from an engine (not shown) provided in the ship.

  The liner 19 has a cylindrical body portion 19a fitted on the outer periphery of the propeller shaft 5, and an annular flange portion 19b provided at the propeller side end portion of the body portion 19a and projecting radially outward. Become. The propeller 3 is fixed to the flange portion 19b through bolts 20. The liner 19 is made of a metal material (for example, high chromium stainless steel).

  Three seal rings 11 are provided on the outer periphery of the trunk portion 19 a of the liner 19 from the stern S side toward the inboard B side with a predetermined interval in the axial direction of the propeller shaft 5. The seal ring 11 on the stern S side is referred to as a first seal ring 11a, the seal ring 11 adjacent to the inboard B side from the first seal ring 11a is referred to as a second seal ring 11b, and is more than the second seal ring 11b. The seal ring 11 adjacent to the inboard B side is referred to as a third seal ring 11c. These seal rings 11 are provided in contact with the outer periphery of the body portion 19 a of the liner 19. Details of the seal ring 11 will be described later. A fishing net prevention ring 23 is attached to the outer periphery of the trunk portion 19a of the liner 19 on the most stern S side of the stern tube sealing device 1 to prevent intrusion of foreign matter in seawater such as a fishing net.

  In some embodiments, the housing 9 is divided into five divided housings 10 (hereinafter, a first divided housing 10a, a second divided housing 10b, and a third divided housing from the stern S side toward the inboard B side). 10c, a fourth divided housing 10d, and a fifth divided housing 10e.) Are overlapped in a laminated state and are integrally fixed to the hull on the stern S side by bolts 25. The divided housing 10 is provided with an annular groove 10 f for holding the seal ring 11 on one side surface or both side surfaces of the divided housing 10 in the width direction. That is, the second divided housing 10b is provided with an annular groove 10f on the side surface on the inboard B side, and the third divided housing 10c and the fourth divided housing 10d are provided with annular grooves 10f on both side surfaces on the stern S side and the inboard B side. The fifth divided housing 10e is provided with an annular groove 10f on the side surface on the stern S side. When the divided housings 10 adjacent to each other in the axial direction of the propeller shaft 5 are integrally fixed, the annular grooves 10f provided in the adjacent divided housings 10 are opposed to each other and cooperate with each other. The seal ring 11 is clamped.

  In some embodiments, the first seal ring 11a is sandwiched and held by the second divided housing 10b and the third divided housing 10c, and the second seal ring 11b is formed by the third divided housing 10c and the fourth divided housing 10d. The third seal ring 11c is sandwiched and held by the fourth divided housing 10d and the fifth divided housing 10e.

  The first seal ring 11a arranged closest to the stern S side and the second seal ring 11b adjacent to the inboard B side approach the propeller shaft 5 side (inward in the radial direction), and thus extend radially toward the stern S side. To prevent the seawater from flowing into the inboard B side. The third seal ring 11c arranged at a position closest to the inboard B side is inclined with respect to the radial direction so as to approach the propeller shaft 5 side (inner side in the radial direction) and thus extend to the inboard side B, and It works to prevent the lubricant from leaking out of the ship.

  In some embodiments, a first annular space 13a (13) is formed in a region defined by the first seal ring 11a, the second seal ring 11b, and the third divided housing 10c, and the second seal ring is formed. A second annular space 13b (13) is formed in a region defined by 11b, the third seal ring 11c, and the fourth divided housing 10d, and is defined by the third seal ring 11c and the fifth divided housing 10e. A third annular space 13c (13) is formed in the region. Each of the first annular space 13a, the second annular space 13b, and the third annular space 13c communicates with an oil reservoir tank (not shown) and stores lubricating oil.

  The seal ring 11 is made of an elastic member made of an elastomer such as rubber, and the rubber material is made of fluorine rubber (for example, Viton made by DuPont) or nitrile rubber (NBR) which is excellent in water resistance and oil resistance. .

  The seal ring 11 is formed in an annular shape, and a hole portion having an inner diameter large enough to allow the liner 19 to be inserted is formed inside thereof. Since the first seal ring 11a, the second seal ring 11b, and the third seal ring 11c have the same shape, the first seal ring 11a will be described, and the second seal ring 11b and the third seal ring 11c will be described. Is omitted. The third seal ring 11c has the same shape as the first seal ring 11a, except that the insertion direction of the first seal ring 11a with respect to the propeller shaft 5 is reversed. The cross-sectional shape of the annular portion of the first seal ring 11a has a constant cross-sectional shape, and FIG. 2 shows a cross-sectional view when viewed from a direction orthogonal to the plane including the central axis X of the propeller shaft 5.

  In some embodiments, the first seal ring 11a is formed on the side surfaces of the second divided housing 10b and the third divided housing 10c, as shown in FIG. 2 (sectional view) and FIG. 3 (partial internal structure diagram). A key portion 11a1 fitted into the annular grooves 10f and 10f, a heel portion 11a2 extending from the key portion 11a1 toward the propeller shaft 5 in a direction substantially perpendicular to the central axis X of the propeller shaft 5, and a heel portion 11a2. An arm portion 11a3 extending obliquely toward the stern S side (propeller 3 side) (see FIG. 1) as it proceeds from the tip of the arm toward the propeller shaft 5, and a lip formed at the tip of the arm portion 11a3 and in close contact with the outer periphery of the liner 19 And a hole 11a7 is formed inside the lip 11a4.

  The first seal ring 11a configured as described above is elastically deformed in a direction in which the arm portion 11a3 is separated from the propeller shaft 5 in a state where the propeller shaft 5 is inserted into the inner hole portion 11a7 (see FIG. 2). An end portion of the lip portion 11a4 (hereinafter referred to as “sliding contact portion 11a6” (see FIG. 2)) that is in sliding contact with the outer periphery of the liner 19 that is externally fitted to the propeller shaft 5 has a contact width W and is elastically deformed. . Accordingly, since the first seal ring 11a has a predetermined contact pressure through the sliding contact portion 11a6 and has a contact width W (see FIG. 3) and contacts the propeller shaft 5, seawater flows into the inboard B side. Can be prevented. The third seal ring 11c having the same structure as the first seal ring 11a can prevent the lubricating oil inside the ship from leaking out of the ship.

  A seal side surface 11a5 is formed at a portion of the first seal ring 11a facing the first annular space 13a. That is, the seal side surface 11a5 is formed at a portion of the first seal ring 11a that faces the first annular space 13a side of the lip portion 11a4, the arm portion 11a3, the heel portion 11a2, and the key portion 11a1. The seal side surface 11a5 of these portions is formed in a planar shape when the seal side surface 11a5 of each portion is viewed from the first annular space 13a side. A metal heat conduction member 27 is continuously provided on each of the seal side surfaces 11a5 of the arm portion 11a3, the heel portion 11a2, and the key portion 11a1 excluding the lip portion 11a4. For this reason, the contact of the lip portion 11a4 of the first seal ring 11a with the propeller shaft 5 may cause leakage, early abnormal wear, etc. without impairing the properties (sealability and wear resistance) that the first seal ring 11a should originally have. Is maintained in an appropriate state where no occurrence occurs.

  In some embodiments, the heat conducting member 27 is formed in a thin film by attaching a material having a relatively high heat conductivity such as copper to the seal side surface 11a5 by vapor deposition or the like. The material of the heat conducting member 27 is not limited to copper, but may be a pure metal or alloy containing any of silver, gold, aluminum, and tungsten. Further, the heat conducting member 27 may be attached to the seal side surface 11a5 by using a plate-like metal in addition to being formed by evaporation.

  When the temperature of the seal ring 11 rises due to the frictional heat generated from the sliding contact portion where the seal ring 11 slides on the outer periphery of the liner 19 when the propeller shaft 5 rotates, a part of this heat conduction member 27 is absorbed. It serves to cool the seal ring 11 by dissipating heat. Details of the operation of the heat conducting member 27 will be described later.

  On the first annular space 13a side of the first seal ring 11a, the arm portion 11a3 is supported by extending to the lip portion 11a4 side of the first seal ring 11a along the heel portion 11a2 and arm portion 11a3 of the first seal ring 11a. A backup ring 10g is disposed. The backup ring 10g is formed in the third divided housing 10c and the fourth divided housing 10d (see FIG. 1). The backup ring 10g extends to the vicinity of the distal end side of the arm portion 11a3, and the inner peripheral surface 10g1 extends along the propeller shaft 5 (see FIG. 3). In addition, this inner peripheral surface 10g1 may extend so as to incline in a direction away from the propeller shaft 5 as it goes to the inboard B side (see FIG. 1).

  The backup ring 10g has a gap 29 between the seal side surface 11a5 of the first seal ring 11a and the surface 10g2 facing the seal side surface 11a5 of the backup ring 10g in a state where the propeller shaft 5 is inserted into the first seal ring 11a. Is provided. In the exemplary embodiment shown in FIG. 3, the gap 29 has a width that is larger than the thickness of the heat conducting member 27.

  As described above, according to the stern tube sealing device 1 according to some embodiments, the sliding contact portion 11a6 of the lip portion 11a4 of the first seal ring 11a slides on the outer periphery of the liner 19 when the propeller shaft 5 rotates. Upon contact, frictional heat is generated at the sliding contact portion 11a6 as shown in FIG. Part of this frictional heat is absorbed by the lubricating oil 15, and part of the remaining frictional heat raises the temperature of the first seal ring 11a. A part of the frictional heat transmitted to the first seal ring 11a is transmitted to the heat conducting member 27 to be radiated, and the heat conducting member 27 is directly passed to the third divided housing 10c (backup ring 10g) through the annular groove 10f. , The heat is radiated to the third divided housing 10c.

  For this reason, most of the frictional heat that raises the temperature of the first seal ring 11 a without being absorbed by the lubricating oil 15 can be radiated through the heat conducting member 27. For this reason, the 1st seal ring 11a can be cooled effectively, deterioration of the 1st seal ring 11a resulting from the temperature rise of the 1st seal ring 11a is controlled, and the life of the 1st seal ring 11a is prolonged. Can do. The frictional heat absorbed by the lubricating oil 15 raises the temperature of the lubricating oil 15 by this frictional heat, but the heat conduction member 27 also absorbs the frictional heat escaping to the lubricating oil 15, and the third divided housing 10c. The heat can be released to escape.

  Next, the individual contents of the exemplary embodiments shown in FIGS. 4, 5 and 6 will be described. In the exemplary embodiment shown in FIG. 4, the heat conducting member 27 is provided over substantially the entire circumference of the first seal ring 11a. That is, as shown in FIG. 4, the heat conducting member 27 includes an arm portion 11 a 3 excluding the lip portion 11 a 4 of the seal side surface 11 a 5, the heel portion 11 a 2, the seal side surfaces 11 a 5 of the key portion 11 a 1, and the first seal ring 11 a. Of the surface 11a8 on the opposite side to the first annular space 13a side, it is provided in a portion excluding the vicinity of the sliding contact portion 11a6 of the lip portion 11a4. The first annular space 13a side of the heat conducting member 27 provided in the key portion 11a1 is directly connected to the third divided housing 10c in a state where the key portion 11a1 is sandwiched between the annular grooves 10f, The heat conducting member 27 on the opposite side to the one annular space 13a side is directly connected to the second divided housing 10b.

  Thus, the heat transfer area of the heat conductive member 27 can be expanded by providing the heat conductive member 27 over substantially the entire circumference of the first seal ring 11a. For this reason, the amount of frictional heat absorbed by the heat conducting member 27 can be increased. Further, since the heat conducting member 27 provided in the key portion 11a1 is in direct contact with the second divided housing 10b and the third divided housing 10c via the annular groove 10f, a part of the frictional heat is transferred to the heat conducting member 27. Can be transmitted directly to the second divided housing 10b and the third divided housing 10c made of metal, and the frictional heat can be effectively radiated. Therefore, the stern tube sealing device 1 including one seal ring 11 that can withstand longer use can be realized. Further, the frictional heat absorbed by the lubricating oil 15 is absorbed by the heat conducting member 27 more, and the absorbed frictional heat can be released from the second divided housing 10b and the third divided housing 10c. .

  In the exemplary embodiment shown in FIGS. 5 and 6, the heat conducting member 27 is provided on the surface 10g2 of the backup ring 10g opposite to the seal side surface 11a5 of the first seal ring 11a. In addition, the inner circumferential surface 10g1 of the backup ring 10g is provided with a plurality of concave and convex portions 10g3 extending along the axial direction of the propeller shaft 5 and having a predetermined interval in the circumferential direction of the inner circumferential surface 10g1.

  Thus, by providing the heat conducting member 27 on the surface 10g2 of the backup ring 10g facing the seal side surface 11a5 of the first seal ring 11a, the sliding contact of the lip portion 11a4 of the first seal ring 11a when the propeller shaft 5 rotates. When the portion 11a6 is in sliding contact with the outer periphery of the liner 19 (see FIG. 1) fitted on the propeller shaft 5, frictional heat is generated from the sliding contact portion 11a6 as shown in FIG. Is absorbed by the lubricating oil 15, and part of the remaining frictional heat raises the temperature of the first seal ring 11a. However, a part of the frictional heat transmitted to the first seal ring 11a is transmitted to the heat conductive member 27 provided in the backup ring 10g via the lubricating oil 15 in the gap 29 and is radiated from the heat conductive member 27. Heat is radiated through the third divided housing 10c.

  For this reason, most of the frictional heat that raises the temperature of the first seal ring 11 a without being absorbed by the lubricating oil 15 can be radiated through the heat conducting member 27. For this reason, the 1st seal ring 11a can be cooled effectively, deterioration of the 1st seal ring 11a resulting from the temperature rise of the 1st seal ring 11a is controlled, and the life of the 1st seal ring 11a is prolonged. be able to.

  Moreover, since the several uneven | corrugated | grooved part 10g3 extended in the direction of the propeller shaft 5 is provided in the internal peripheral surface 10g1 of the backup ring 10g, the heat-transfer area of the backup ring 10g can be expanded by these uneven | corrugated | grooved parts 10g3. For this reason, the frictional heat absorbed by the lubricating oil 15 can be effectively absorbed from the inner peripheral surface 10g1. Therefore, the first seal ring 11a can be more effectively cooled by absorbing the frictional heat by the heat conducting member 27 and by absorbing the frictional heat from the inner peripheral surface 10g1 of the backup ring 10g. Therefore, the stern tube sealing device 1 including the seal ring 11 that can withstand long-term use can be realized. The extending direction of the concavo-convex portion 10g3 is not limited to the propeller axis direction, and may be the circumferential direction of the inner peripheral surface 10g1.

  When the heat conducting member 27 is provided on the surface 10g2 of the backup ring 10g, the material of the backup ring 10g is the same material as the heat conducting member 27 (pure metal or alloy including any of silver, copper, gold, aluminum, and tungsten). ). In this case, the backup ring 10g and the heat conducting member 27 are integrally formed. Thus, by forming the backup ring 10g and the heat conduction member 27 with the same material having high thermal conductivity, the frictional heat that raises the temperature of the first seal ring 11a can be absorbed more effectively. The first seal ring 11a can be further cooled. Therefore, the stern tube sealing device 1 including the seal ring 11 that can withstand long-term use can be realized.

  Further, when the heat conduction member 27 is provided on the surface 10g2 of the backup ring 10g, if the temperature increase of the first seal ring 11a can be suppressed by the heat conduction member 27, the uneven portion on the inner peripheral surface 10g1 of the backup ring 10g. 10g3 may not be provided.

  Next, an exemplary embodiment of a ship including the above-described stern tube sealing device 1 will be described with reference to FIG. As shown in FIG. 1, the ship 50 is attached to the stern S with the stern tube 7 extending in the front-rear direction of the hull 51. A propeller shaft 5 is inserted into the stern tube 7, and a stern side end portion of the propeller shaft 5 extends from the stern tube 7 to the outside of the stern tube. The stern tube sealing device 1 is disposed so as to surround the propeller shaft 5 extending from the stern tube 7 to the outside of the boat.

  The propeller shaft 5 is disposed so as to penetrate the stern tube sealing device 1, and a plurality of propellers 3 are provided at the tip of the propeller shaft 5 extending from the stern tube sealing device 1.

  Thus, by providing the stern tube sealing device 1 at the stern S of the hull 51, as described above, seawater can be prevented from flowing into the inboard B side, and the lubricating oil on the inboard B side can be Can be prevented from leaking. Moreover, the ship 50 provided with the stern tube sealing apparatus 1 which has the seal ring 11 which can be used for a long term can be provided.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the object of the present invention. For example, the various embodiments described above may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Stern tube sealing apparatus 3 Propeller 5 Propeller shaft 7 Stern tube 9 Housing 10 Divided housing 10a First divided housing 10b Second divided housing 10c Third divided housing 10d Fourth divided housing 10e Fifth divided housing 10f Annular groove 10g Backup ring 10g1 Inner peripheral surface 10g2 Surface 10g3 Concavity and convexity 11 Seal ring 11a First seal ring 11b Second seal ring 11c Third seal ring 11a1 Key portion 11a2 Heel portion 11a3 Arm portion 11a4 Lip portion 11a5 Seal side surface 11a6 Sliding contact portion 11a7 Hole portion 13 Space 13a First annular space 13b Second annular space 13c Third annular space 15 Lubricating oil 17 Bolt 19 Liner 19a Body portion 19b Flange portion 20, 25 Bolt 23 Fishing net prevention ring 2 7 Thermal Conductive Member 29 Clearance 50 Ship 51 Ship Hull B Inboard S Stern X Center Axis W W Tangent Width

Claims (7)

A plurality of seal rings that are in sliding contact with the outer peripheral surface of a liner that is externally fitted to a propeller shaft that is coupled to a propeller that is mounted on the stern of the ship;
Lubricating oil stored in an annular space defined by the seal ring and another seal ring adjacent in the axial direction of the propeller shaft of the seal ring;
A metal heat conduction member provided on a seal side surface of the seal ring on the annular space side;
A metal housing having an annular groove into which the key portion of the seal ring that is the end opposite to the sliding contact portion of the seal ring is fitted;
With
The heat conducting member is
A first portion that contacts the annular space so as to be exposed to the lubricating oil;
A second portion extending continuously from the first portion to the annular groove on the side surface of the seal and sandwiched between the wall surface of the housing and the key portion forming the annular groove;
A stern tube sealing device comprising: The stern tube sealing device according to claim 1, wherein the housing is fitted on the liner and holds the plurality of seal rings. The seal ring is
The key part;
An arm portion extending from the key portion toward the propeller shaft and extending along the axial direction of the propeller shaft;
A lip portion formed at a tip portion of the arm portion and having a sliding contact portion that is in sliding contact with the outer peripheral surface of the liner,
The metal heat conduction member is formed in at least a part of a region excluding the sliding contact portion of the seal side surface on the annular space side of the seal ring. The stern tube sealing device as described. A plurality of seal rings that are in sliding contact with the outer peripheral surface of a liner that is externally fitted to a propeller shaft that is coupled to a propeller that is mounted on the stern of the ship;
Lubricating oil stored in an annular space defined by the seal ring and another seal ring adjacent in the axial direction of the propeller shaft of the seal ring;
A metal housing having an annular groove into which a key portion of the seal ring that is an end opposite to the sliding contact portion of the seal ring is fitted ;
The metal housing is provided along a heel portion and an arm portion located between the sliding portion of the seal ring and the key portion of the housing, and supports the seal ring from the annular space side. Including a backup ring section
The backup ring portion is provided in contact with the lubricating oil ,
A plurality of concave and convex portions are provided on the inner peripheral surface of the backup ring portion facing the outer peripheral surface of the liner so as to be in contact with the lubricating oil,
The lubricating oil is stored in a circumferentially continuous space formed as a part of the annular space between the inner peripheral surface of the backup ring portion provided with the uneven portion and the outer peripheral surface of the liner. ,
The stern tube sealing device , wherein a minimum dimension in the radial direction of the space is larger than a dimension in the radial direction of the uneven portion . The stern tube sealing device according to claim 4, wherein the backup ring portion is made of a pure metal or an alloy containing any of silver, copper, gold, aluminum, and tungsten. A plurality of seal rings that are in sliding contact with the outer peripheral surface of a liner that is externally fitted to a propeller shaft that is coupled to a propeller that is mounted on the stern of the ship;
Lubricating oil stored in an annular space defined by the seal ring and another seal ring adjacent in the axial direction of the propeller shaft of the seal ring;
A backup ring that supports the seal ring from the annular space side;
Of the surface of the backup ring that supports the seal ring from the annular space side so as to be in contact with the lubricating oil, the metal is provided so as to cover the surface of the seal ring that faces the seal side surface on the annular space side. A stern tube sealing device. A propeller mounted on the stern;
A propeller shaft coupled to the propeller;
The stern tube sealing device according to any one of claims 1 to 6 , which prevents inflow of seawater existing radially outside the propeller shaft and outflow of lubricating oil in the ship. To ship.

Images