Water lubricated propulsion system for a skegless vessel

Abstract

The application relates to a stern-tube-removed ship water-lubricated propulsion system, which comprises a ship shell, a lubricating cabin, a tail shaft, a sealing element and a water-lubricated bearing unit, the lubricating cabin is arranged in the ship shell, the lubricating cabin is loaded with lubricating water, the tail shaft passes through the lubricating cabin and the ship shell in sequence to extend to the outside of the ship shell, the tail shaft is connected with the lubricating cabin and the ship shell through the sealing element, a plurality of water-lubricated bearing units are arranged in the lubricating cabin, and the tail shaft is connected with the ship shell and / or the lubricating cabin through the water-lubricated bearing units. Compared with the prior art, the stern-tube-removed ship water-lubricated propulsion system provided by the application adopts a closed water-lubricated form, completely avoids the lubricating oil leakage problem and the use limitation problem of the open water-lubricated form, and removes the stern-tube structure, instead, the water-lubricated bearing unit is completely soaked in the lubricating water in the lubricating cabin, the heat dissipation effect of the water-lubricated bearing unit and the lubricating water supply are ensured, and the lubricating failure is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship technology, and in particular to a stern tube-free ship water-lubricated propulsion system. BACKGROUND

[0002] The ship propulsion system is the core working system of the ship, and its working state directly determines the working stability and reliability of the ship. The power main engine of the ship propulsion system is connected with the propeller through the tail shaft, and the tail shaft is generally arranged horizontally. Under the action of the gravity of the earth, the tail shaft will bend downward. In order to reduce the influence of the gravity of the earth, a plurality of bearings need to be arranged to support the tail shaft.

[0003] The ship tail bearing is mainly divided into oil-lubricated and water-lubricated forms. On the inland and coastal waterways, except for a few small ships in closed areas, most of the ship tail bearings still use oil-lubricated systems. When the ship is older, the tail shaft seal often fails due to aging, damage, and other reasons, causing lubricating oil leakage and endangering environmental safety.

[0004] Although the water-lubricated bearing can solve the problem of lubricating oil leakage and pollution, it has high requirements for the heat dissipation performance and working environment of the system. Domestic and foreign ships using water-lubricated bearings are generally small ships sailing in lake areas and closed water areas with clear water quality on inland rivers. There are also some ships sailing in the ocean and other vessels without silt particles, and most of the ships use open water-lubricated bearing systems, without considering the problems of silt particle wear and lubrication and heat dissipation. However, the Yangtze River and its tributaries contain a large amount of silt, and the open water-lubricated tail shaft propulsion system is more likely to cause wear and failure of the key friction pair in the silt environment, resulting in irregular bearing wear, shaft neck eccentricity, and abnormal vibration, and even causing system failure and ship accidents, causing serious consequences. Therefore, the open water-lubricated tail shaft propulsion system has certain limitations in replacing the traditional oil-lubricated propulsion system.

[0005] The gap between the tail shaft tube and the main shaft of the existing closed water-lubricated tail shaft system is small, and there is a problem of insufficient lubricating water supply and delayed heat dissipation. The accumulated heat will quickly raise the temperature of the lubricating water, causing lubrication failure. SUMMARY

[0006] Therefore, it is necessary to provide a stern tube-free ship water-lubricated propulsion system to solve the technical problems of the existing technology, such as the risk of oil leakage, the use restrictions of open water-lubricated systems, and the unreliable lubrication effect of closed water-lubricated systems.

[0007] The application provides a stern-tubeless ship water-lubricated propulsion system, which comprises a ship hull, a lubricating cabin, a tail shaft, a sealing element and a water-lubricated bearing unit, the lubricating cabin is arranged in the ship hull, the lubricating cabin is loaded with lubricating water, the tail shaft extends out of the ship hull by sequentially penetrating the lubricating cabin and the ship hull, the tail shaft is connected with the lubricating cabin and the ship hull by the sealing element, and the water-lubricated bearing unit is arranged in the lubricating cabin and the tail shaft is connected with the ship hull and / or the lubricating cabin through the water-lubricated bearing unit.

[0008] Further, the lubricating cabin and the ship hull jointly form a lubricating cavity for loading the lubricating water.

[0009] Further, the sealing element comprises a front sealing element connected with the lubricating cabin and a rear sealing element connected with the ship hull.

[0010] Further, the water-lubricated bearing unit comprises a water-lubricated bearing and a bearing shell, the water-lubricated bearing is detachably sleeved on the tail shaft, and the water-lubricated bearing is detachably connected with the ship hull and / or the lubricating cabin through the bearing shell.

[0011] Further, the water-lubricated bearing comprises a plurality of split bearings, the split bearings are detachably connected with each other and are clamped on the tail shaft.

[0012] Further, the bearing shell comprises a plurality of split shells, the split shells are detachably connected with each other and are detachably connected with the split bearings.

[0013] Further, a filter screen is arranged on the outer side of the rear sealing element.

[0014] Further, a temperature monitor and a liquid level monitor are arranged in the lubricating cabin.

[0015] Further, an auxiliary heat dissipation device is arranged, the auxiliary heat dissipation device comprises a circulating pipeline, a circulating pump and a radiator, the circulating pipeline is connected with the lubricating cabin at two ends, and the circulating pump and the radiator are arranged on the circulating pipeline.

[0016] Further, the lubricating cabin is provided with a closable water inlet, a water outlet and an inspection opening.

[0017] Compared with the prior art, the stern-tubeless ship water-lubricated propulsion system provided by the application adopts a closed water-lubricated form, completely avoids the lubricating oil leakage problem and the use limitation problem of the open water-lubricated form, and removes the stern tube structure, and instead, the water-lubricated bearing unit is completely immersed in the lubricating water in the lubricating cabin, so that the heat dissipation effect of the water-lubricated bearing unit and the supply of the lubricating water are ensured, and the lubrication failure is avoided.

[0018] The above description is only a summary of the technical scheme of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, the preferred embodiments of the present application are described in detail below with reference to the accompanying drawings. The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the present application and together with the description serve to explain the present application. In the drawings:

[0020] Fig. 1 is a structural schematic diagram of a preferred embodiment of the water-lubricated propelling system of the stern-tubeless ship provided by the present application;

[0021] Figure 2 Fig. 2 is a structural schematic diagram of another preferred embodiment of the water-lubricated propelling system of the stern-tubeless ship provided by the present application. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present application are described below in detail with reference to the accompanying drawings, which constitute a part of this application and are used to explain the principles of the present application together with the embodiments of the present application, but are not used to limit the scope of the present application.

[0023] Please refer to Figure 1 The present application provides a water-lubricated propelling system of the stern-tubeless ship. The water-lubricated propelling system of the stern-tubeless ship comprises a ship hull 1, a lubricating cabin 2, a tail shaft 3, a sealing member 4 and a water-lubricated bearing unit 5. The lubricating cabin 2 is built in the ship hull 1, and the lubricating cabin 2 is loaded with lubricating water. The tail shaft 3 passes through the lubricating cabin 2 and the ship hull 1 in sequence to extend to outside of the ship hull 1, and one end of the tail shaft 3 is connected to a ship main engine through a shaft coupling 6, and the other end of the tail shaft 3 is connected to a propeller 7. The tail shaft 3 is connected to the lubricating cabin 2 and the ship hull 1 through the sealing member 4, and the existing mature sealing equipment and sealing mode can be used. A plurality of water-lubricated bearing units 5 are built in the lubricating cabin 2 and are immersed in the lubricating water. The tail shaft 3 is connected to the ship hull 1 and / or the lubricating cabin 2 through the water-lubricated bearing unit 5, the water-lubricated bearing unit 5 plays a role of supporting the tail shaft 3 and improving the straightness of the tail shaft 3.

[0024] The water-lubricated propelling system of the stern-tubeless ship provided by the present application ensures the heat dissipation effect of the water-lubricated bearing unit 5 and the supply of the lubricating water by completely immersing the water-lubricated bearing unit 5 in the lubricating water, and avoids the failure of lubrication. At the same time, the use of the closed water-lubrication also avoids the problem of oil lubrication leakage and the problem of use limitation of the open water-lubrication.

[0025] In some embodiments, the lubrication cabin 2 and the hull shell 1 jointly form a lubrication cavity for loading lubricating water. That is, a part of the hull shell 1 also participates in the composition of the lubrication cabin 2 for loading lubricating water. During the running of the ship, the heat generated by the friction between the propeller shaft 3 and the water-lubricated bearing unit 5 is absorbed by the lubricating water, causing the temperature of the lubricating water to rise. Through the hull shell 1, the lubricating water can exchange heat with the external water body, greatly slowing down or even avoiding the temperature of the lubricating water from rising to a dangerous level.

[0026] In the preferred embodiment, the lubrication cabin 2 is designed as a double-layer pressure-resistant cabin, and its size is adaptively designed according to the structure of the ship stern. The lubrication cabin 2 has a closable water inlet, a water outlet, and a maintenance opening. The water inlet and the water outlet can be used to supplement and replace the lubricating water, and the maintenance opening is used for workers to enter for maintenance.

[0027] In some embodiments, the lubrication cabin 2 is also provided with a temperature monitor and a liquid level monitor. The temperature monitor is used to monitor the temperature of the lubricating water, and the liquid level detector is used to monitor the liquid level of the lubricating water, and the lubricating water is supplemented in time when the lubricating water is insufficient. A water quality monitor can also be provided to detect the water quality of the lubricating water. When the sealing element 4 is aged and damaged, causing sealing failure, external environmental water may enter the lubrication cabin 2 and contaminate the lubricating water. By detecting the water quality, the sealing element 4 and the lubricating water can be replaced in time.

[0028] In the preferred embodiment, the water-lubricated propulsion system of the sternless propeller tube ship also has an auxiliary heat dissipation device, which includes a circulating pipeline, a circulating pump, and a radiator. The two ends of the circulating pipeline are connected to the lubrication cabin, and the circulating pump and the radiator are arranged on the circulating pipeline. When the temperature detector detects that the temperature of the lubricating water is too high and there is a risk of lubrication failure, the auxiliary heat dissipation device is started. The circulating pump drives the lubricating water to flow through the radiator to quickly dissipate heat and cool the lubricating water, so as to ensure that the temperature of the lubricating water remains below a safe value.

[0029] In some embodiments, the sealing element 4 includes a front sealing element 41 connected to the lubrication cabin 2 and a rear sealing element 42 connected to the hull shell 1. The sealing element 4 can prevent the external water body from contaminating the lubricating water, so that the water-lubricated bearing unit 5 is in a stable and good working environment.

[0030] In the preferred embodiment, the outer side of the rear sealing element 42, that is, the side outside the ship, is also provided with a filter screen 8 to block the invasion of silt in the external water body. The material of the filter screen 8 is 316L stainless steel, and the side length of the mesh hole is less than 10 microns, which can block the contact of fine silt and prevent the silt from invading the inside of the lubrication cabin 2 to cause serious wear of the propeller shaft 3 and the water-lubricated bearing unit 5.

[0031] In this embodiment, two water-lubricated bearing units 5 are provided, and in other embodiments, the number and position of the water-lubricated bearing units 5 can be flexibly selected according to the length of the propeller shaft 3.

[0032] Please refer to Figure 2 In some embodiments, the water-lubricated bearing unit 5 comprises a water-lubricated bearing 51 and a bearing housing 52, the water-lubricated bearing 51 is detachably sleeved on the propeller shaft 3, and the water-lubricated bearing 51 is detachably connected with the hull shell 1 and / or the lubricating cabin 2 through the bearing housing 52.

[0033] In the preferred embodiments, the water-lubricated bearing 51 comprises a plurality of split bearings 511, which are detachably connected with each other and are clamped on the propeller shaft 3. In this embodiment, two split bearings 511 are used, which are detachably connected by bolts relative to the propeller shaft 3.

[0034] The bearing housing 52 comprises a plurality of split housings 521, which are detachably connected with each other and are detachably connected with the split bearings 511. At least one split housing 521 is connected with the hull shell 1 and / or the lubricating cabin 2. In this embodiment, two split housings 521 are also used, so that only the bearing housing 52 needs to be disassembled when the water-lubricated bearing 51 needs to be disassembled and maintained, without the need to disassemble the propeller shaft 3.

[0035] Compared with the prior art, the water-lubricated propulsion system of the ship without stern tube provided by the present application adopts a closed water-lubricated form, completely avoids the problem of lubricating oil leakage and the use restriction problem of open water-lubricated, and removes the structure of the stern tube, but completely immerses the water-lubricated bearing unit in the lubricating water in the lubricating cabin, ensures the heat dissipation effect of the water-lubricated bearing unit and the supply of lubricating water, and avoids the failure of lubrication.

[0036] The above is only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered within the protection scope of the present application.

Claims

1. A stern tube-less marine water lubricated propulsion system, characterized in that, It comprises: a hull, a lubricating cabin, a tail shaft, a seal and a water-lubricated bearing unit, the lubricating cabin is built in the hull, the lubricating cabin is loaded with lubricating water, the tail shaft passes through the lubricating cabin and the hull in turn to extend to outside of the hull, the tail shaft is connected with the lubricating cabin and the hull through the seal respectively, the seal is used to avoid the outside water polluting the lubricating water, a plurality of the water-lubricated bearing units are built in the lubricating cabin, the tail shaft is connected with the hull and / or the lubricating cabin through the water-lubricated bearing unit.

2. The stern-tube-less marine water lubricated propulsion system according to claim 1, characterized in that, The hull and the lubricating cabin enclose a lubricating cavity for loading lubricating water.

3. The stern-tube-less marine water lubricated propulsion system according to claim 2, characterized in that, The seal comprises a front seal connected with the lubricating cabin and a rear seal connected with the hull.

4. The stern-tube-less marine water lubricated propulsion system according to claim 1, characterized in that, The water-lubricated bearing unit comprises a water-lubricated bearing and a bearing shell, the water-lubricated bearing is detachably sleeved on the tail shaft, and the water-lubricated bearing is detachably connected with the hull and / or the lubricating cabin through the bearing shell.

5. The stern-tube-less marine water lubricated propulsion system according to claim 4, characterized in that, The water-lubricated bearing comprises a plurality of split bearings, the split bearings are detachably connected with each other and are clamped on the tail shaft.

6. The stern-tube-less marine water lubricated propulsion system according to claim 5, characterized in that, The bearing shell comprises a plurality of split shells, the split shells are detachably connected with each other and are detachably connected with the split bearings.

7. The stern-tube-less marine water lubricated propulsion system according to claim 3, characterized in that, It further comprises a filter screen arranged on the outer side of the rear seal.

8. The stern-tube-less marine water lubricated propulsion system according to claim 1, characterized in that, It further comprises a temperature monitor and a liquid level monitor arranged in the lubricating cabin.

9. The stern-tube-less marine water lubricated propulsion system according to claim 1, characterized in that, It further comprises an auxiliary heat dissipation device, the auxiliary heat dissipation device comprises a circulating pipeline, a circulating pump and a radiator, the circulating pipeline is connected with the lubricating cabin at both ends, and the circulating pump and the radiator are arranged on the circulating pipeline.

10. The stern-tube-less marine water lubricated propulsion system according to claim 1, characterized in that, The lubricating cabin has a closable water inlet, a water outlet and an inspection opening.

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