Ship tail shaft sealing device capable of achieving emergency sealing

Abstract

The utility model discloses a ship tail shaft sealing device capable of achieving emergency sealing, which comprises a tail shaft sealing sleeve, a tail shaft sealing seat and four tail shaft sealing rings arranged between the tail shaft sealing sleeve and the tail shaft sealing seat, and a sealing moving ring fixedly connected to the tail shaft sealing sleeve in a sealing mode is arranged in a middle ring cavity between the two tail shaft sealing rings in the middle. The end face of one end of the fixed sealing ring can be attached to the corresponding end face of the movable sealing ring, a piston part is arranged at the other end of the fixed sealing ring and movably supported in a piston cavity of the driving cylinder sleeve, the driving cylinder sleeve is installed on the stern shaft sealing seat, and driving oil holes communicated with a hydraulic station are formed in the two ends of the piston cavity respectively. Two liquid discharge holes are formed in the two ends of the bottom of the middle annular cavity and connected to corresponding oil discharge containers or water discharge containers in a cabin through corresponding communicating holes respectively. According to the ship stern shaft sealing device capable of achieving emergency sealing, emergency sealing can be started under the condition that a conventionally-arranged stern shaft sealing ring fails, and the stern shaft sealing function is maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to a marine accessory, especially a sealing device of a ship stern shaft. BACKGROUND

[0002] The ship stern shaft sealing device is a device for sealing between the ship stern shaft outside the ship body and the ship body to prevent water from entering the ship body, and a commonly used and effective stern shaft sealing device is a sealing device with four sealing rings. The four sealing rings are arranged at intervals between the stern shaft sealing seat fixed on the ship body and the stern shaft sealing sleeve sealingly mounted on the stern shaft. The two adjacent sealing rings form a sealing chamber. The two sealing rings adjacent to the propeller are water sealing rings to prevent seawater from entering. The other two sealing rings adjacent to the stern shaft pipe are oil sealing rings to prevent the lubricating oil in the stern shaft pipe from leaking. When water or oil leaks during the operation of the stern shaft, the leaked water or oil enters the middle annular cavity between the two middle sealing rings and flows into the discharge collection tank in the ship body through the discharge hole at the bottom of the stern shaft sealing seat for centralized treatment, thereby avoiding pollution caused by the leaked liquid. A small amount of leakage does not affect the sealing and operation of the stern shaft. However, once the stern shaft sealing fails and a large amount of water or oil leaks, the ship has to be stopped for repair, and the repair process is complex, difficult and time-consuming, which seriously affects the sailing plan of the ship. SUMMARY

[0003] In view of the above problems in the prior art, the technical problem to be solved by the utility model is to provide a ship stern shaft sealing device capable of emergency sealing, which can use emergency sealing to maintain the sealing function of the stern shaft when the conventional stern shaft sealing ring fails.

[0004] To solve the above technical problem, the utility model provides a ship stern shaft sealing device capable of emergency sealing, which comprises a stern shaft sealing sleeve sealingly mounted on a stern shaft, a stern shaft sealing seat, four stern shaft sealing rings arranged between the stern shaft sealing sleeve and the stern shaft sealing seat, a sealing movable ring arranged in a middle annular cavity between the two middle stern shaft sealing rings, the sealing movable ring being sealingly fixed on the stern shaft sealing sleeve, a sealing fixed ring arranged in the middle annular cavity, one end face of the sealing fixed ring being capable of abutting against the corresponding end face of the sealing movable ring, the other end of the sealing fixed ring being provided with a piston part, the end of the sealing fixed ring provided with the piston part being axially movably supported in the piston cavity of a driving cylinder sleeve, the driving cylinder sleeve being mounted on the stern shaft sealing seat, the two ends of the piston cavity of the driving cylinder sleeve being respectively provided with driving oil holes, the two driving oil holes being connected to a hydraulic station through the stern shaft sealing seat, and the piston part being located between the two driving oil holes; two discharge holes being arranged at the bottom of the middle annular cavity of the stern shaft sealing seat, the two discharge holes being respectively located on the left and right sides of the abutting end faces of the sealing movable ring and the sealing fixed ring, and the two discharge holes being respectively connected to corresponding oil discharge containers or water discharge containers in the ship cabin through corresponding communication holes.

[0005] The sealing dynamic ring is arranged on the stern shaft sealing sleeve and rotates with the stern shaft of the ship, the sealing static ring can move left and right under the action of the hydraulic oil injected through the drive oil hole at both ends of the drive cylinder sleeve piston cavity, in the case that the sealing function of each stern shaft sealing ring is normal, the sealing static ring is pushed to the side away from the sealing dynamic ring by the hydraulic oil, the opposite end surfaces of the sealing dynamic ring and the sealing static ring are not in close contact, the sealing of the stern shaft is realized by the four conventional stern shaft sealing rings, the sealing function under normal conditions is maintained, if there is a small amount of leakage, the leaked water or oil will be discharged through the discharge hole arranged at the bottom of the intermediate ring cavity, and the amount of discharge will be used as an index for judging the working condition of the stern shaft sealing, when the stern shaft sealing ring suddenly fails, the water or oil discharged through the discharge hole will be abnormally increased, when it is confirmed that the stern shaft sealing fails and needs to be treated urgently, the sealing static ring is pushed to the sealing dynamic ring by injecting the hydraulic oil through the drive oil hole, the opposite end surfaces of the sealing dynamic ring and the sealing static ring are in close contact, thereby forming a mechanical seal, preventing the water or oil leaked from the failed water-tight sealing ring or oil-tight sealing ring from entering the opposite area, and thereby maintaining the sealing function of the stern shaft, the water or oil entering the intermediate cavity due to the sealing failure can play a good heat dissipation effect on the friction surface of the opposite end surfaces of the sealing dynamic ring and the sealing static ring, and the operation of the formed end surface mechanical seal can be ensured. In this way, when the conventional stern shaft sealing ring fails unexpectedly, the mechanical seal device arranged can play an emergency sealing function, and the ship can continue to sail without stopping for emergency repair.

[0006] In an embodiment of the utility model, the sealing dynamic ring is sleeved on the stern shaft sealing sleeve, and a sealing ring is arranged between the stern shaft sealing sleeve and the sealing dynamic ring. In this embodiment, the sealing dynamic ring is convenient to install, and the sealing ring arranged can prevent leakage between the inner hole of the sealing dynamic ring and the stern shaft sealing sleeve, thereby preventing the leaked water or oil from penetrating along the surface of the stern shaft sealing sleeve to the other end.

[0007] In another embodiment of the utility model, the drive cylinder sleeve comprises a ring-shaped cylinder body and a ring-shaped end cover, a ring-shaped groove is arranged on one end surface of the ring-shaped cylinder body, one end of the piston part of the sealing static ring is inserted into the piston cavity formed by the ring-shaped groove and the ring-shaped end cover, and a sealing ring is arranged between the inner hole surface of the sealing static ring, the outer peripheral surface of the piston part and the step outer circular surface adjacent to the outer peripheral surface of the piston part and the corresponding surfaces of the ring-shaped cylinder body or the ring-shaped end cover. In this embodiment, the drive cylinder sleeve has a simple structure and can support and drive the sealing static ring.

[0008] In another embodiment of the utility model, the stern shaft sealing seat is composed of a plurality of seat body segments connected in the axial direction, and the stern shaft sealing rings are respectively arranged in the corresponding seat body segments. In this embodiment, the installation of the stern shaft sealing rings and the drive cylinder sleeve is facilitated.

[0009] The utility model further preferably provides an embodiment, the drive cylinder jacket is installed between two adjacent seat body sections. Adopt this embodiment, the drive cylinder jacket is convenient to install.

[0010] The utility model further preferably provides another embodiment, the drain hole is arranged along the radial direction of the corresponding seat body section. Adopt this embodiment, the water or oil that seeps out can be conveniently discharged, and the processing of the drain hole is also facilitated.

[0011] The utility model further preferably provides still another embodiment, the communication hole is arranged in the side wall of the stern shaft sealing seat. Adopt this embodiment, the communication hole leads to the inside of the cabin in the side wall of the stern shaft sealing seat, which is safer and more reliable than using the inner hole of the external pipeline as the communication hole.

[0012] The utility model further preferably provides still another embodiment, the communication hole is arranged in the side wall of the stern shaft sealing seat. Adopt this embodiment, the communication hole leads to the inside of the cabin in the side wall of the stern shaft sealing seat, which is safer and more reliable than using the inner hole of the external pipeline as the communication hole.

[0013] The utility model further preferably provides still another embodiment, the communication hole is arranged in the side wall of the stern shaft sealing seat. Adopt this embodiment, the communication hole leads to the inside of the cabin in the side wall of the stern shaft sealing seat, which is safer and more reliable than using the inner hole of the external pipeline as the communication hole. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model further preferably provides still another embodiment, the communication hole is arranged in the side wall of the stern shaft sealing seat. Adopt this embodiment, the communication hole leads to the inside of the cabin in the side wall of the stern shaft sealing seat, which is safer and more reliable than using the inner hole of the external pipeline as the communication hole.

[0015] Figure 1 It is a structure schematic view of a specific embodiment of the utility model emergency sealable ship stern shaft sealing device;

[0016] Figure 2 It is Figure 1 It is a local enlarged view of I part in the structure shown in figure 2;

[0017] Figure 3 It is Figure 1 It is a local enlarged view of II part in the structure shown in figure 2.

[0018] In the drawing: 1-stern shaft sealing sleeve, 2-drain hole, 3-stern shaft sealing seat, 31-seat body section, 4-leakage blocking ring, 5-drive cylinder jacket, 51-ring cylinder, 52-ring end cover, 6-sealing fixed ring, 61-piston part, 7-drive oil hole, 8-sealing movable ring, 9-communication hole, 10-stern shaft sealing ring, 11-sealing ring. DETAILED DESCRIPTION

[0019] In Figure 1The shown emergency sealable ship stern shaft sealing device, the stern shaft sealing sleeve 1 is sealingly fixed on the stern shaft and rotates with the stern shaft, a stern shaft sealing seat 3 is sleeved on the stern shaft sealing sleeve 1, four stern shaft sealing rings 10 are installed between the stern shaft sealing sleeve 1 and the inner hole of the stern shaft sealing seat 3, in order to facilitate the installation of the stern shaft sealing ring 10, the stern shaft sealing seat 3 is composed of a plurality of seat body segments 31 connected by a sealing gasket or a sealing ring in the axial direction, each sealing segment 31 is integrally connected by a connecting bolt, and each stern shaft sealing ring 10 is installed in the corresponding seat body segment 31. Figure 2The sealing dynamic ring 8 is in the form of a disc and is sleeved on the stern shaft sealing sleeve 1 and is fixed by a set screw or a pin. An O-shaped sealing ring 11 is arranged between the stern shaft sealing sleeve 1 and the sealing dynamic ring 8, so that the sealing dynamic ring 8 is fixedly sealed on the stern shaft sealing sleeve 1. A sealing static ring 6 is further arranged in the middle annular cavity. One end face of the sealing static ring 6 is in abutment with a corresponding end face of the sealing dynamic ring 8 to form an end face sealing pair. The sealing dynamic ring 8 and the sealing static ring 6 of the end face sealing pair can be made of a material with high wear resistance (such as silicon carbide or hard alloy), or only a wear-resistant piece made of a material with high wear resistance is embedded and fixed on the abutted corresponding end faces to meet the use requirements of the end face sealing pair. The other end of the sealing static ring 6 is provided with a protruding piston portion 61. The end of the sealing static ring 6 provided with the piston portion 61 is axially movably supported in a piston cavity of a driving cylinder sleeve 5. The driving cylinder sleeve 5 is installed on the stern shaft sealing seat 3. The driving cylinder sleeve 5 includes a ring-shaped cylinder body 51 and a ring-shaped end cover 52. In order to facilitate the installation of the driving cylinder sleeve 5, the outer diameter of the ring-shaped cylinder body 51 is the same as the outer diameter of the seat body section 31. The driving cylinder sleeve 5 formed by the ring-shaped cylinder body 51 and the ring-shaped end cover 52 is installed between two adjacent seat body sections 31 as a part of the stern shaft sealing seat 3 through a sealing gasket or a sealing ring. A ring-shaped groove is arranged on one end face of the ring-shaped cylinder body 51. The diameters of the inner and outer circular surfaces of the ring-shaped groove correspond to the inner and outer diameters of the piston portion 61. The ring-shaped end cover 52 is fixed on the ring-shaped groove of the ring-shaped cylinder body 51 by a screw. The inner hole diameter of the ring-shaped end cover 52 corresponds to the diameter of the outer peripheral surface of the sealing static ring 6 adjacent to the piston portion 61. The piston cavity is formed between the inner side surface of the ring-shaped end cover 52 and the ring-shaped groove. One end of the sealing static ring 6 provided with the piston portion 61 is inserted into the piston cavity formed by the ring-shaped groove and the ring-shaped end cover 52. Sealing rings 11 are arranged between the inner hole surface of the sealing static ring 6, the outer peripheral surface of the piston portion 61, the stepped outer circular surface adjacent to the outer peripheral surface of the piston portion 61, and the corresponding surfaces of the ring-shaped cylinder body 51 or the ring-shaped end cover 52. The sealing rings 11 are O-shaped sealing rings. Driving oil holes 7 are arranged at both ends of the piston cavity of the driving cylinder sleeve 5. The two driving oil holes 7 are in communication with a hydraulic station in the cabin through the side wall of the stern shaft sealing seat 3 in the axial direction. The piston portion 61 is located between the outlets of the two driving oil holes 7.

[0020] Referring to Figure 3Two rows of liquid holes 2 are arranged at the bottom of the middle ring cavity of the stern shaft sealing seat 3, and are respectively arranged at the left and right sides of the abutting end face of the sealing stationary ring 6 and the sealing movable ring 8 and along the radial direction of the corresponding seat body section 31, and the two rows of liquid holes 2 are respectively connected to the corresponding oil discharge container or water discharge container in the cabin through corresponding communication holes 9 arranged in the side wall of the stern shaft sealing seat 3. The liquid leakage blocking ring 4 is also sealingly connected to the stern shaft sealing sleeve 1, and the position of the liquid leakage blocking ring 4 corresponds to the liquid leakage hole 9 on the side where the driving cylinder sleeve 5 is arranged. In the normal working state in which the sealing stationary ring 6 and the sealing movable ring 8 do not abut to form an end face mechanical seal, the water leaked from the two sealing rings (water sealing rings) adjacent to the propeller will be blocked by the liquid leakage blocking ring 4 and fall down, and then be discharged through the lower liquid discharge hole 9, and the oil leaked from the two sealing rings (oil sealing rings) adjacent to the stern shaft tube will be blocked by the sealing movable ring 8 and fall down, and then be discharged through the lower liquid discharge hole 9, so that the leaked water and oil will not be mixed in the middle ring cavity and need to be treated as sewage.

[0021] When the stern shaft sealing ring 10 suddenly fails and the sealing function fails, the amount of water or oil discharged through the liquid discharge hole 9 will abnormally increase. Through detection and judgment of the amount of discharged liquid, after confirming that the sealing function of the stern shaft sealing ring 10 fails, the control system can automatically inject hydraulic oil into the corresponding piston cavity through the driving oil hole 7 from the hydraulic station, so that the sealing stationary ring 6 is pressed towards the sealing movable ring 8, the opposite end faces of the sealing movable ring 8 and the sealing stationary ring 6 are tightly abutted, and thus a mechanical seal is formed, so as to prevent the water or oil leaked from the failed water sealing ring or oil sealing ring from entering the opposite area, thereby maintaining the function of the stern shaft sealing. At this time, the leakage of water or oil caused by the sealing failure is blocked by the end face mechanical seal pair composed of the sealing movable ring 8 and the sealing stationary ring 6, so that the leakage does not need to be discharged, and the passage between the liquid discharge hole 9 on the side where the sealing failure occurs and the corresponding oil discharge container or water discharge container can be closed. In this way, the ship does not need to stop for emergency repair, and can continue to sail until it arrives at the port for treatment.

[0022] The above only lists some preferred embodiments of the present application, but the present application is not limited thereto, and many improvements and changes can be made. Any improvement and change made on the basis of the basic principles of the present application shall be considered to fall within the protection scope of the present application.

Claims

1. An emergency sealing device for a ship's stern shaft, comprising a stern shaft sealing sleeve (1) and a stern shaft sealing seat (3) sealed and installed on the stern shaft, and four stern shaft sealing rings (10) disposed between the stern shaft sealing sleeve (1) and the stern shaft sealing seat (3), characterized in that: A sealing moving ring (8) is provided in the intermediate annular cavity between the two intermediate stern shaft seal rings (10). The sealing moving ring (8) is sealed and fixed to the stern shaft seal sleeve (1). A sealing stationary ring (6) is also provided in the intermediate annular cavity. One end face of the sealing stationary ring (6) can fit with the corresponding end face of the sealing moving ring (8). The other end of the sealing stationary ring (6) is provided with a piston part (61). The end of the sealing stationary ring (6) with the piston part (61) can be axially movably supported in the piston cavity of the drive cylinder sleeve (5). The drive cylinder sleeve (5) is installed on the stern shaft seal. On the seat (3), driving oil holes (7) are provided at both ends of the piston chamber of the driving cylinder liner (5). The two driving oil holes (7) pass through the stern shaft sealing seat (3) and are connected to the hydraulic station. The piston part (61) is located between the two driving oil holes (7). Two drain holes (2) are provided at the bottom of the middle annular cavity of the stern shaft sealing seat (3). The two drain holes (2) are located on the left and right sides of the mating end face of the sealing moving ring (8) and the sealing fixed ring (6), respectively. The two drain holes (2) are connected to the corresponding oil discharge container or water discharge container in the cabin through the corresponding connecting hole (9).

2. The emergency-sealing ship stern shaft sealing device according to claim 1, characterized in that: The sealing ring (8) is sleeved on the stern shaft sealing sleeve (1), and a sealing ring (11) is provided between the stern shaft sealing sleeve (1) and the sealing ring (8).

3. The emergency-sealing ship stern shaft sealing device according to claim 1, characterized in that: The drive cylinder liner (5) includes an annular cylinder body (51) and an annular end cap (52). An annular groove is provided on one end face of the annular cylinder body (51). One end of the piston part (61) on the sealing ring (6) is inserted into the piston cavity formed by the annular groove and the annular end cap (52). A sealing ring (11) is provided between the inner hole surface of the sealing ring (6), the outer peripheral surface of the piston part (61), and the outer circular surface of the step adjacent to the outer peripheral surface of the piston part (61) and the corresponding surface of the annular cylinder body (51) or the annular end cap (52).

4. The emergency sealing device for a ship's stern shaft according to claim 1, characterized in that: The stern shaft sealing seat (3) is composed of several seat segments (31) connected in an axial seal, and the stern shaft sealing rings (10) are respectively installed in the corresponding seat segments (31).

5. The emergency sealing device for a ship's stern shaft according to claim 4, characterized in that: The drive cylinder liner (5) is installed between two adjacent body sections (31).

6. The emergency-sealing ship stern shaft sealing device according to claim 1, characterized in that: The drain hole (2) is arranged radially along the corresponding seat section (31).

7. The emergency sealing device for ship stern shafts according to claim 1, characterized in that: The connecting hole (9) is located in the side wall of the stern shaft sealing seat (3).

8. The emergency-sealing ship stern shaft sealing device according to claim 1, characterized in that: A leakage retaining ring (4) is also sealed and fixed to the stern shaft sealing sleeve (1).

9. The emergency-sealing ship stern shaft sealing device according to claim 8, characterized in that: The position of the leakage retaining ring (4) corresponds to the drain hole (2) on the side where the drive cylinder liner (5) is located.

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