stern shaft sealing device

Abstract

This invention discloses a stern shaft sealing device, comprising a stern shaft sealing sleeve and a stern shaft sealing seat sealed and installed on the stern shaft, four stern shaft sealing rings disposed between the stern shaft sealing sleeve and the stern shaft sealing seat, and a combined radial partition plate disposed in the intermediate annular cavity between the two middle stern shaft sealing rings. The combined radial partition plate is located in the axial middle of the intermediate annular cavity and includes a shaft partition plate fixedly connected to the stern shaft sealing sleeve by the sealing sleeve and a seat partition plate fixedly connected to the stern shaft sealing seat, with the shaft partition plate located between the two seat partition plates. Two drain holes are provided at the bottom of the stern shaft sealing seat in the intermediate annular cavity, located on the left and right sides of the combined radial partition plate, respectively. The two drain holes are connected to corresponding oil or water containers inside the ship's hull through corresponding connecting holes. The stern shaft sealing device of this invention can collect leaked oil and water separately for reuse.

Description

Technical Field

[0001] This invention relates to a marine fitting, and more particularly to a stern shaft sealing device for a ship. Background Technology

[0002] The stern shaft is the last section of a ship's shafting system, extending beyond the hull to mount the propeller. The stern shaft, extending beyond the hull, is sealed to the hull by a stern shaft sealing device. A common structure for this device is a four-ring seal. These four rings are spaced apart between the stern shaft sealing seat, fixed to the hull, and the stern shaft sealing sleeve, which is mounted on the stern shaft. A sealed chamber is formed between adjacent rings. The two rings adjacent to the propeller are water seals to prevent seawater ingress, while the other two are oil seals adjacent to the stern shaft tube to prevent lubricating oil leakage. Some sealing devices also circulate water within the sealed chamber between the two water seals, creating a water film between the water seals and the stern shaft sealing sleeve, lubricating and cooling the water seals and achieving a better seal. Similarly, lubricating oil is circulated within the sealed chamber between the two oil seals, also lubricating and cooling them and achieving a better seal. During operation, leakage is inevitable between the water seal ring and the oil seal ring. The leaked water or oil enters the sealing chamber between the two seal rings and flows into the stern shaft seal seat's drain hole, ultimately ending up in the hull's vent collection tank. When either the water or oil seal ring is damaged, the leaked oil or water also flows into the vent collection tank through the drain hole. Simultaneously, a detection device will detect the stern shaft seal failure based on the amount of water or oil leaking into the vent collection tank, triggering an alarm signal. A problem with this stern shaft seal device is that the liquid discharged through the drain hole is a mixture of oil and water. This mixture cannot be reused and must be treated as a contaminant, increasing operating costs. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a stern shaft sealing device that can collect leaked oil and water separately for reuse.

[0004] To solve the above-mentioned technical problems, the present invention provides a stern shaft sealing device, including a stern shaft sealing sleeve and a stern shaft sealing seat sealed and installed on the stern shaft, four stern shaft sealing rings disposed between the stern shaft sealing sleeve and the stern shaft sealing seat, and a combined radial partition plate disposed in the intermediate annular cavity between the two middle stern shaft sealing rings. The combined radial partition plate is located in the middle of the axial direction of the intermediate annular cavity. The combined radial partition plate includes a shaft partition plate fixedly connected to the stern shaft sealing sleeve by the sealing sleeve and a seat partition plate fixedly connected to the stern shaft sealing seat by the sealing sleeve. The shaft partition plate is located between the two seat partition plates. Two drain holes are provided at the bottom of the stern shaft sealing seat in the intermediate annular cavity. The two drain holes are respectively located on the left and right sides of the combined radial partition plate. The two drain holes are respectively connected to the corresponding oil discharge container or water discharge container in the hull through corresponding connecting holes.

[0005] In the above structure, a combined radial partition is provided in the intermediate annular cavity between the two stern shaft seals. This combined radial partition is located in the middle of the intermediate annular cavity along the axial direction. The combined radial partition includes a shaft partition that is sealed and fixed to the stern shaft seal sleeve and a seat partition that is sealed and fixed to the stern shaft seal seat. The shaft partition is located between the two seat partitions. The combined radial partition divides the intermediate annular cavity between the two stern shaft seals into two partition cavities along the axial direction. One partition cavity is adjacent to the water seal on the propeller side as a water partition cavity, and the other partition cavity is adjacent to the oil seal on the stern shaft tube side as an oil partition cavity. In this way, water leaking from the water seal will enter the adjacent water partition cavity and flow to the bottom of the inner hole of the stern shaft seal seat, and oil leaking from the oil seal will enter the adjacent oil partition cavity and flow to the bottom of the inner hole of the stern shaft seal seat. The two will not mix.

[0006] Furthermore, since two drain holes are provided at the bottom of the stern shaft seal seat in the intermediate annular cavity, and the two drain holes are located on the left and right sides of the combined radial partition, respectively, and the two drain holes are connected to the corresponding oil drain container or water drain container in the cabin through corresponding connecting holes, the water entering the water separation cavity will be drained from the drain hole at the bottom of the water separation cavity through the corresponding connecting hole into the water drain container in the cabin, and the oil entering the oil separation cavity will be drained from the drain hole at the bottom of the oil separation cavity through the corresponding connecting hole into the oil drain container in the cabin. In this way, the oil and water leaking from the stern shaft sealing device will not mix and will be collected separately. Therefore, the leaked water and oil can be reused after being collected separately, reducing the possibility of pollution or waste. Even if the water seal ring or oil seal ring is damaged, the leaked water or oil can be discharged. When the amount of water or oil discharged in a unit time reaches a certain level, the detection device will be triggered to alarm, and it can be identified which side of the seal is damaged and will be repaired in time. Therefore, the leaked water or oil will not cross the combined radial partition, ensuring that the leaked water and oil will not mix.

[0007] In a preferred embodiment of the present invention, the shaft partition is fixedly connected to the stern shaft sealing sleeve by a partition sleeve, and a sealing ring is provided between the partition sleeve and the stern shaft sealing sleeve. With this embodiment, water or oil leaking from the gap between the water sealing ring or oil sealing ring on one side and the stern shaft sealing sleeve will not flow from the gap between the partition sleeve and the stern shaft sealing sleeve to the other side of the shaft partition. The partition sleeve also facilitates the fixed connection between the shaft partition and the stern shaft sealing sleeve.

[0008] In another preferred embodiment of the present invention, end protrusions are provided at both ends of the partition sleeve. With this embodiment, the end protrusions prevent water or oil leaking from the gap between the adjacent stern shaft seal ring and the stern shaft seal sleeve from flowing through the outer diameter surface of the partition sleeve to the space between the shaft partition and the seat partition, and then into the other side of the shaft partition.

[0009] In another preferred embodiment of the present invention, two intermediate protruding edges are provided on the partition sleeve, and the two intermediate protruding edges are respectively located on the outer sides of the two partitions. With this embodiment, the intermediate protruding edges can prevent water or oil leaking from the corresponding side from continuing to flow along the outer diameter surface of the partition sleeve towards the side where the corresponding partition is located, further ensuring the reliability of the combined radial partition separation function.

[0010] In a further preferred embodiment of the present invention, the stern shaft sealing seat is composed of several seat segments connected in a sealing manner along the axial direction, and the stern shaft sealing rings are respectively installed in the corresponding seat segments. This embodiment facilitates the installation of the stern shaft sealing rings.

[0011] In another further preferred embodiment of the invention, the seat partition is sealed and installed between two adjacent seat segments. This embodiment facilitates the installation of the seat partition.

[0012] In another preferred embodiment of the present invention, the inner diameter of the seat partition is smaller than the outer diameter of the end protrusion and the middle protrusion. This embodiment fully utilizes the blocking effect of the end protrusion and the middle protrusion. Water or oil that may flow through or adhere to the end protrusion or the middle protrusion will flow to the lower part of the end protrusion or the middle protrusion, which is below the inner diameter of the seat partition, and then drip down or be thrown out by the rotation of the stern shaft to the seat partition wall outside the inner diameter of the seat partition or to the bottom of the inner hole of the stern shaft sealing seat, preventing it from flowing across the inner hole of the seat partition to the other side, thus achieving a better blocking effect.

[0013] In a further preferred embodiment of the present invention, the drain hole is arranged radially along the corresponding seat section. This embodiment facilitates the drainage of leaked water or oil and also simplifies the machining of the drain hole.

[0014] In another further preferred embodiment of the invention, the connecting hole is disposed in the side wall of the stern shaft seal. With this embodiment, the connecting hole, located in the side wall of the stern shaft seal, leads to the interior of the ship's hull, which is safer and more reliable than using an external pipe's internal bore as the connecting hole. Attached Figure Description

[0015] The stern shaft sealing device of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of a specific embodiment of the stern shaft sealing device of the present invention;

[0017] Figure 2 yes Figure 1 A magnified view of part I in the structure shown;

[0018] Figure 3 yes Figure 1 A partially enlarged view of part I of the structure shown, which uses another structural partition sleeve.

[0019] In the figure: 1-stern shaft sealing sleeve, 2-drain hole, 3-stern shaft sealing seat, 31-seat body section, 4-combined radial partition, 41-seat partition, 42-shaft partition, 5-partition sleeve, 51-end protrusion, 52-middle protrusion, 6-connecting hole, 7-stern shaft sealing ring, 8-sealing ring. Detailed Implementation

[0020] exist Figure 1 In the stern shaft sealing device shown, the stern shaft sealing sleeve 1 is fixedly installed on the stern shaft and rotates with the stern shaft. A stern shaft sealing seat 3 is fitted outside the stern shaft sealing sleeve 1. Four stern shaft sealing rings 7 are installed between the stern shaft sealing sleeve 1 and the inner hole of the stern shaft sealing seat 3. To facilitate the installation of the stern shaft sealing rings 7, the stern shaft sealing seat 3 is composed of several seat segments 31 that are connected axially by sealing gaskets or sealing rings. Each sealing segment 31 is fixed together by connecting bolts. The stern shaft sealing rings 7 are installed in the corresponding seat segments 31. Four stern shaft seal rings 7 are spaced apart, forming a sealing ring cavity between adjacent stern shaft seal rings 7. A combined radial partition 4 is provided in the intermediate ring cavity between the two middle stern shaft seal rings 7. The combined radial partition 4 is located in the middle of the intermediate ring cavity in the axial direction, dividing the intermediate ring cavity into two parts. One partition cavity is adjacent to the propeller side and is a water partition cavity, while the other partition cavity is adjacent to the stern shaft tube side and is an oil partition cavity. The combined radial partition 4 includes a shaft partition 42 that is sealed and fixed to the stern shaft seal sleeve 1 and a seat partition 41 that is sealed and fixed to the stern shaft seal seat 3. The shaft partition 42 is located between the two seat partitions 41. As a preferred embodiment, see [reference needed]. Figure 2The shaft partition 42 is fixedly connected to the stern shaft sealing sleeve 1 via the partition sleeve 5. A sealing ring 8 is provided between the partition sleeve 5 and the stern shaft sealing sleeve 1. The partition sleeve 5 can be easily fixed to the stern shaft by a set screw. For ease of installation, the partition sleeve 5 can be divided into left and right parts. The two parts of the partition sleeve 5 are respectively sealed and fixedly connected to the stern shaft sealing sleeve 1 and clamp the shaft partition 42 therein. End protrusions 51 are provided at both ends of the partition sleeve 5; see also Figure 3 Two intermediate protruding edges 52 may also be provided on the partition sleeve 5. The two intermediate protruding edges 52 are located on the outer side of the two seat partitions 41 respectively. The intermediate protruding edges 52 or the end protruding edges 51 may be provided separately or simultaneously on the partition sleeve 5. The inner diameter of the seat partition 41 is smaller than the outer diameter of the end protruding edges 51 and the intermediate protruding edges 52. The seat partition 41 is sealed between two adjacent seat sections 31 by a sealing gasket or sealing ring to facilitate installation.

[0021] Two drain holes 2 are provided at the bottom of the stern shaft sealing seat 3 in the intermediate annular cavity. The two drain holes 2 are located on the left and right sides of the combined radial partition 4 and are respectively connected to the water separation cavity and the oil separation cavity. The drain holes 2 are arranged radially along the corresponding seat section 31. The two drain holes 2 are respectively connected to the corresponding oil discharge container or water discharge container in the cabin through the corresponding connecting hole 6. The connecting hole 6 is set in the side wall of the stern shaft sealing seat 3. The connecting hole 6 can be processed after each seat section 31 and seat partition 41 are combined into one piece to ensure that the connecting hole 6 is in the same position on each seat section 31 and seat partition 41, so as to ensure smooth drainage.

[0022] The above are only some preferred embodiments of the present invention, but the present invention is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A stern shaft sealing device, comprising a stern shaft sealing sleeve (1) and a stern shaft sealing seat (3) sealed and installed on a stern shaft, and four stern shaft sealing rings (7) disposed between the stern shaft sealing sleeve (1) and the stern shaft sealing seat (3), characterized in that: A combined radial partition (4) is provided in the intermediate annular cavity between the two stern shaft seals (7). The combined radial partition (4) is located in the middle of the axial direction of the intermediate annular cavity. The combined radial partition (4) includes a shaft partition (42) that is sealed and fixed to the stern shaft seal sleeve (1) and a seat partition (41) that is sealed and fixed to the stern shaft seal seat (3). The shaft partition (42) is located between the two seat partitions (41). Two drain holes (2) are provided at the bottom of the stern shaft seal seat (3) in the intermediate annular cavity. The two drain holes (2) are located on the left and right sides of the combined radial partition (4) 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 (6).

2. The stern shaft sealing device according to claim 1, characterized in that: The shaft partition (42) is fixed to the stern shaft sealing sleeve (1) by the partition sleeve (5), and a sealing ring (8) is provided between the partition sleeve (5) and the stern shaft sealing sleeve (1).

3. The stern shaft sealing device according to claim 2, characterized in that: The partition sleeve (5) has end protrusions (51) at both ends.

4. The stern shaft sealing device according to claim 2, characterized in that: Two central protrusions (52) are provided on the partition sleeve (5), and the two central protrusions (52) are located on the outside of the two partitions (41).

5. The stern shaft sealing device 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 ring (7) is installed in the corresponding seat segment (31).

6. The stern shaft sealing device according to claim 5, characterized in that: The seat partition (41) is sealed between two adjacent seat sections (31).

7. The stern shaft sealing device according to claim 1 or 6, characterized in that: The inner diameter of the seat partition (41) is smaller than the outer diameter of the end protrusion (51) and the middle protrusion (52).

8. The stern shaft sealing device according to claim 5, characterized in that: The drain hole (2) is arranged radially along the corresponding seat section (31).

9. The stern shaft sealing device according to claim 1 or 5, characterized in that: The connecting hole (6) is located in the side wall of the stern shaft sealing seat (3).

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