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KR-102963973-B1 - Sealing Device for a Steerable Propulsion Unit of a Ship

KR102963973B1KR 102963973 B1KR102963973 B1KR 102963973B1KR-102963973-B1

Abstract

A sealing device for a swivel propeller of a ship according to an embodiment of the present invention is a sealing device for a swivel propeller of a ship for sealing a gap between a swivel shaft penetrating downwardly through a hull in a ship to which a swivel propeller is applied, comprising: a shaft sealing housing disposed to surround the circumference of the swivel shaft and forming a space between the swivel shaft and the swivel shaft; a seal made of a rubber material disposed in the space and having a ring structure that is in close contact with the outer surface of the swivel shaft and the inner surface of the shaft sealing housing, respectively, to seal the space, and having a bent cross-sectional structure to form a seal space that is open downwardly inside; and a separable support ring made of a metal material disposed in the seal space of the seal and supporting the seal from the inside so that the seal maintains a circular ring shape; wherein the separable support ring forms a closed loop, and is configured such that one side of the circumference can be selectively separated into both sides, thereby allowing the closed loop to be opened.

Inventors

  • 윤배광
  • 권순일
  • 한호정
  • 한민규

Assignees

  • 주식회사 케이티이

Dates

Publication Date
20260512
Application Date
20251230

Claims (5)

  1. In a sealing device for a slewing propeller of a ship for sealing the gap between a slewing shaft penetrating downwardly through the hull and the hull in a ship equipped with a slewing propeller, A shaft housing (100) positioned to surround the circumference of a pivot shaft (6) and forming a space (110) between it and the pivot shaft (6); A rubber seal (200) having a ring structure disposed in the above space (110) and adhering to the outer surface of the pivot shaft (6) and the inner surface of the shaft seal housing (100), respectively, to seal the above space (110), and having a bent cross-sectional structure such that a seal space (201) open downwardly is formed inside; It includes a separable support ring (300) made of a metal material that is disposed in the seal space (201) of the seal (200) and supports the seal (200) from the inside so that the seal (200) maintains a circular ring shape; The above-described separable support ring (300) forms a closed loop, wherein one side of the circumference is configured to be selectively separable to both sides, thereby allowing the closed loop to be opened. Sealing device for a ship's slewing propeller.
  2. In Article 1, The above seal (200) is, A plate contact portion (210) having a predetermined height and in close contact with the inner circumference of the shaft housing (100); An extension portion (220) extending inwardly from the plate contact portion (210) toward the pivot axis (6); It includes a lip portion (230) that is further extended inwardly from the inner end of the extension portion (220) toward the pivot axis (6), with the inner end in close contact with the pivot axis (6), and is formed by bending at an angle to face the plate contact portion (210). The seal space (201) is formed by being surrounded by the plate contact portion (210), extension portion (220), and lip portion (230), and The above-described separable support ring (300) is spaced apart from the lip portion (230) and is provided to support the inner surface of the plate contact portion (210), characterized in that Sealing device for a ship's slewing propeller.
  3. In Article 2, The above separable support ring (300) is, A ring body (310) formed in a band shape having an outer circumference corresponding to the inner circumference of the plate contact portion (210), supporting the plate contact portion (210) from the inside, and having a separated end formed on one side; It includes a body coupling part (320) provided at the separation end of the ring body (310) to selectively connect the separation end of the ring body (310), and The above body coupling part (320) is, A first protrusion (321) protruding inward from one end of the separated end of the ring body (310); A second protrusion (322) protruding inward from the other end of the separated end of the ring body (310); and It includes a protrusion fastening member (323) that selectively fixes the first protrusion (321) and the second protrusion (322), and The first protrusion (321) and the second protrusion (322) are formed with an inner and outer width smaller than the inner and outer width of the extension (220), and are characterized by being spaced apart from the lip (230). Sealing device for a ship's slewing propeller.
  4. In Paragraph 3, On the inner surface of the plate contact portion (210), a support ring mounting portion (211) is formed that is recessed in a shape corresponding to the separable support ring (300). In the support ring mounting portion (211), a restraining portion (211a) is formed to surround and restrain the upper or lower end of the ring body (310) by forming a groove into which the upper or lower end of the ring body (310) is inserted for fixing the detachable support ring (300). The first protrusion (321) and the second protrusion (322) are characterized in that their height is smaller than the height of the ring body (310) and they are positioned at the height center of the ring body (310) so as to be spaced apart from the top and bottom of the ring body (310), thereby preventing interference with the restraining part (211a). Sealing device for a ship's slewing propeller.
  5. In claim 1, The above shaft housing (100) includes a plurality of plates stacked vertically along the longitudinal direction of the pivot shaft (6). The above plurality of plates are, A shielding plate (150) positioned at the bottom and configured to be selectively separated into both sides in a split structure to enable selective opening of the closed loop; A first housing plate (160) is laminated and coupled to the upper part of the shielding plate (150), and has a first space (111) formed therein in which the seal (200) is disposed, wherein the first space (111) is opened downward so that the seal (200) disposed therein can be removed downward; A second housing plate (170) is laminated and coupled to the upper part of the first housing plate (160) and coupled to the hull, and has a second space (112) formed therein in which the seal (200) is disposed, wherein the second space (112) is opened downward so that the seal (200) disposed therein can be removed downward; The lower opening of the first space portion (111) is shielded by the shielding plate (150), and the lower opening of the second space portion (112) is shielded by the second housing plate (170). The shielding plate (150) is separated to allow access for replacement maintenance to the seal (200) and detachable support ring (300) disposed in the first space (111), and the first housing plate (160) is released from the second housing plate (170) to allow access for replacement maintenance to the seal (200) and detachable support ring (300) disposed in the second space (112). Sealing device for a ship's slewing propeller.

Description

Sealing Device for a Steerable Propulsion Unit of a Ship The present invention relates to a sealing device for a slewing propeller of a ship. During navigation, a ship is steered by the rudder. In conventional ships, the propeller and the rudder are separate, each performing a distinct role. Compared to this conventional steering method, modern ships frequently utilize slewing propellers as the primary propeller. Slewing thrusters combine propulsion and steering functions without a separate steering device, and representative examples include pod-type thrusters and rim-type thrusters. Such a slewing thruster comprises a slewing shaft extending outward from the hull and a thruster coupled to the slewing shaft. The thruster is equipped with a power unit and a propeller driven by it, and provides thrust to the vessel by driving the propeller. The slewing shaft is rotatably supported by a slewing bearing at the stern and is provided with its lower portion penetrating the hull. The slewing shaft rotates in forward and reverse directions by the power of a rotational power source provided in the hull, and this rotation causes the propeller to rotate. Meanwhile, a gap is created between the lower part of the slewing shaft and the hull, and the gap is sealed against the hull of the ship by a sealing device. The sealing device is provided to seal the gap from the inside or outside of the gap to prevent lubricating oil from the slewing bearing from leaking into the sea and to prevent seawater from entering the ship. In this regard, the prior art Korean Registered Patent Publication KR 10-1881466 B1 discloses a slewing seal structure for a propulsion unit that is provided in the gap between the hull and the slewing shaft to form a seal between the hull and the slewing shaft. In addition, the prior art Korean Published Patent Application KR 10-2025-0100427 A discloses a sealing structure that is coupled to the hull and provided along the circumference of a pivot shaft (steering rotation axis) to form a seal between the hull and the pivot shaft. Here, the sealing structure is disclosed to include a steering-side shaft seal housing formed to allow the pivot shaft to pass through and to form a steering-side space between the pivot shaft and the steering-side shaft, and a seal provided in the space to seal the space. Figure 1 is a cross-sectional view of a sealing device for a conventional slewing propeller of a ship. FIG. 2 is a cross-sectional view of a seal applied to a sealing device for a conventional slewing propeller of a ship. As in the prior art, the sealing device (5) for a conventional swivel propeller of a ship is configured and applied to include a shaft seal housing (51) formed to allow a swivel shaft (6) to pass through and to form a space between the swivel shaft (6) and the shaft seal housing (51), and a seal (52) provided in the space to seal the space between the swivel shaft (6) and the shaft seal housing (51). In addition, the seal (52) is applied in a structure in which a metal support ring (54) is embedded inside to maintain a stable shape. Referring to FIGS. 1 and 2, the shaft housing (51) is generally composed of one or more plates having a ring structure, and the seal (52) is composed of a seal body (53) of a rubber structure and a support ring (54) embedded inside the seal body (53) to support the shape of the seal body (53). The seal body (53) is configured to have a lip portion (53a) that contacts the pivot shaft (6) at an angle in the direction of the applied pressure, so that it can be more stably adhered to the pivot shaft (6) by pressure applied from the inside or outside. The support ring (54) is formed of a metal material having elasticity and is formed in a closed-loop structure in the shape of a circular ring. This support ring (54) is embedded inside the seal body (53) to maintain the stable shape of the seal body (53). In addition, the sealing device (5) for a conventional ship's slewing propeller further comprises a spring (55) that elastically supports the lip portion (53a) of the seal body (53) in contact with the slewing shaft (6) in the direction of the slewing shaft (6). The spring (55) is applied as a ring-shaped tension spring placed along the outer circumference of the lip portion (53a) to elastically support the lip portion (53a) with respect to the pivot axis (6). Meanwhile, the seal body (53) of the rubber structure is likely to be worn out by friction with the pivot shaft (6) and damaged by impact and pressure, which requires periodic replacement and maintenance of the seal (52). However, in the case of a conventional sealing device (5) for a swivel propeller of a ship, a support ring (54) is embedded inside the seal (52), so in order to replace the seal (52), it is required to detach the propeller (7) located at the bottom of the swivel shaft (6) and then install a new seal (52) through the bottom of the swivel shaft (6). Therefore, there is a problem that the replacement