Water supply system and water supply method for water-lubricated bearings of a ship

Abstract

The present application relates to the technical field of water supply for ship water-lubricated bearings, and discloses a water supply system and a water supply method for ship water-lubricated bearings, which comprises a main water path and an emergency standby water path interface, a seawater coarse filter, a cooling water pump and an automatic backwashing fine filter are sequentially arranged on the main water path, the emergency standby water path interface is connected to the main water path and used for connecting a ship fresh water system, a main pipeline is connected to the terminal end of the main water path, is divided into at least three water inlet branch pipes through a flow divider, and the outlet ends of the water inlet branch pipes are connected to different positions in the circumferential direction of the water-lubricated bearing, the cooling water flow rate of each water inlet branch pipe is 2.0 m / s-3.0 m / s, and the water supply method comprises the steps of water supply, flow division and water source switching. The present application can adapt to different water quality conditions through double water source switching, and can realize uniform cooling of the water-lubricated bearing through asymmetric pipe arrangement, so that the problems of lubrication failure and uneven cooling caused by deteriorated water quality are effectively solved, the service life of the bearing is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of water supply technology for marine water-lubricated bearings, specifically to a water supply system and method for marine water-lubricated bearings. Background Technology

[0002] Water-lubricated bearings are widely used in marine propulsion systems due to their advantages such as simple structure, convenient maintenance, and no oil pollution. Compared with traditional oil-lubricated bearings, water-lubricated bearings use water as the lubricating medium, avoiding the risk of pollution to the marine environment caused by lubricating oil leakage. However, water-lubricated bearings still face challenges from changes in water quality during actual operation. Under normal seawater conditions, simply filtered seawater can meet the lubrication and cooling requirements of water-lubricated bearings. However, when ships navigate in shallow waters, estuaries, or other waters with poor water quality, the concentration of sediment particles carried by the seawater increases significantly, and microbial growth intensifies. These impurities enter the lubrication interface of the water-lubricated bearing with the water supply, damaging the integrity of the lubricating water film and causing abnormal wear and corrosion of the water-lubricated bearing material. In severe cases, this can lead to lubrication failure, threatening the safety of ship navigation. Furthermore, the heat generated during the operation of water-lubricated bearings needs to be carried away by the flowing cooling water in a timely manner. If the water supply is insufficient or unevenly distributed, it will cause excessive local temperature rise in the water-lubricated bearing, accelerating material aging and wear.

[0003] In the existing technology, the water supply system of marine water-lubricated bearings usually only has a single seawater supply path, which directly introduces seawater from the outside of the ship, and supplies it to the water-lubricated bearing after simple filtration. This method has a single water source and cannot switch to a clean water source when the water quality deteriorates. In addition, the water inlet branch pipe adopts a symmetrical layout, and the cooling water enters symmetrically from both sides of the water-lubricated bearing, making it difficult to achieve uniform circumferential cooling of the water-lubricated bearing. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a water supply system and method for water-lubricated bearings in ships, which solves the problems mentioned in the background, such as lubrication failure, uneven cooling, and abnormal wear of water-lubricated bearings when ships are navigating in shallow water or waters with deteriorated water quality.

[0005] This invention provides the following technical solution: a water supply system and method for water-lubricated bearings in ships, comprising: The main waterway has an inlet end connected to the seawater main pipe. Along the water flow direction, the main waterway is equipped with a seawater coarse filter, a main cooling water pump, and an automatic backwash fine filter. An emergency backup waterway interface is provided, which is connected to the main waterway and used to connect to the ship's freshwater system. The main pipeline connects to the main waterway terminal at its inlet. A diverter, wherein the inlet end of the diverter is connected to the outlet end of the main pipeline; At least three water inlet branch pipes are provided, with the inlet end of each water inlet branch pipe connected to the outlet end of the distributor, and the outlet end of each water inlet branch pipe connected to different circumferential positions of the water-lubricated bearing. The total cross-sectional area of ​​each water inlet branch pipe is configured such that the cooling water flow velocity through each water inlet branch pipe is 2.0 m / s to 3.0 m / s.

[0006] Preferably, a parallel backup pipeline is provided on the main water line, and a backup cooling water pump is provided on the parallel backup pipeline.

[0007] Preferably, the flow rates of both the main cooling water pump and the standby cooling water pump are configured to satisfy Q = 1.2DL / min, where D is the shaft diameter supported by the water-lubricated bearing, in mm.

[0008] Preferably, there are three water inlet branch pipes, and the outlet ends of the three water inlet branch pipes are respectively connected to the upper position, the four o'clock position and the eight o'clock position of the water lubricated bearing.

[0009] Preferably, the filtration accuracy of the automatic backwashing fine filter is 300 μm; A drain pipe is connected to the seawater coarse filter, and a drain valve is installed on the drain pipe.

[0010] Preferably, pressure alarms are installed on both the main waterway and the main pipeline.

[0011] Preferably, a main valve is provided on the main water line. By closing the main water line valve and opening the emergency backup water line interface, the emergency backup water line interface is connected to the main water line.

[0012] Preferably, it also includes a sealing device disposed at the port axial end of the water-lubricated bearing and fitted onto the shaft supported by the water-lubricated bearing, for sealing the end gap of the water-lubricated bearing, and the pressure bearing capacity of the sealing device is configured to be not less than the pressure corresponding to the ship's draft plus 30m water column.

[0013] The water supply method for water-lubricated bearings in ships includes the following steps: Water supply steps: The water is supplied from the main seawater pipe through the main waterway, and then sequentially through seawater coarse filtration, pressurization by the main cooling water pump, and automatic backwash fine filtration before being delivered to the main pipeline; Diversion step: The cooling water in the main pipeline is divided into at least three streams by a diverter, and each stream is delivered to different circumferential positions of the water-lubricated bearing through at least three inlet branch pipes. The total cross-sectional area of ​​the three inlet branch pipes is configured such that the cooling water flow velocity through each inlet branch pipe is 2.0 m / s to 3.0 m / s. Water source switching procedure: When the vessel is sailing in the preset water area, close the main valve and open the emergency backup water circuit interface to switch the water supply source from the main water circuit to the emergency backup water circuit interface. The emergency backup water circuit interface is connected to the vessel's freshwater system.

[0014] Preferably, the method further includes a sealing step: sealing the end gap of the water-lubricated bearing by means of a sealing device disposed at the port axial end of the water-lubricated bearing and fitted on the shaft, wherein the pressure bearing capacity of the sealing device is not less than the pressure corresponding to the ship's draft plus 30m water column.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, by setting an emergency backup waterway interface connected to the main waterway and with the connection point located downstream of the automatic backwashing fine filter, allows the ship to switch to the ship's freshwater system when navigating in shallow water or areas with poor water quality. This avoids premature damage to the water-lubricated bearings caused by silt wear and seawater corrosion when the ship is navigating in shallow water or areas with poor water quality.

[0016] 2. This invention, by adopting an asymmetrical pipeline design, with three water inlet branches arranged above the water-lubricated bearing, at the four o'clock and eight o'clock positions respectively, breaks the flow dead zone of the traditional symmetrical layout, achieves uniform circumferential cooling of the water-lubricated bearing, and eliminates local overheating and local wear phenomena. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the water supply system for the ship's water-lubricated bearing of the present invention.

[0018] In the diagram: 1. Main seawater pipe; 2. Main waterway; 3. Seawater coarse filter; 4. Main cooling water pump; 5. Automatic backwash fine filter; 6. Emergency backup waterway interface; 7. Main pipeline; 8. Diverter; 9. Inlet branch pipe; 10. Parallel backup pipeline; 11. Backup cooling water pump; 12. Drain pipe; 13. Drain valve; 14. Pressure alarm; 15. Main valve. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 The water supply system for a ship's water-lubricated bearing includes: a main waterway 2, a main pipe 7, a distributor 8, and an inlet branch pipe 9. The inlet of the main waterway 2 is connected to the seawater main pipe 1, which introduces cooling water from seawater outside the hull. Along the water flow direction, the main waterway 2 is equipped with a seawater coarse filter 3, a main cooling water pump 4, and an automatic backwash fine filter 5. The automatic backwash fine filter 5 has a filtration accuracy of 300μm. The seawater coarse filter 3 is located at the upstream end of the main waterway 2 and is used for preliminary filtration of the seawater, intercepting larger suspended solids, seaweed, shell fragments, and other impurities to prevent clogging of subsequent equipment. The main cooling water pump 4 is located downstream of the seawater coarse filter 3 and provides power for the flow of cooling water in the main waterway 2. The flow rate of pump 4 needs to be configured according to the shaft diameter of the water-lubricated bearing. The automatic backwashing fine filter 5 is located downstream of the cooling water pump and is used to finely filter the seawater after coarse filtration. The automatic backwashing fine filter 5 has an automatic backwashing function. When the pressure difference on both sides of the filter element reaches the set value, the backwashing program is automatically started to discharge the intercepted impurities without manual disassembly and cleaning. The filtration accuracy of the automatic backwashing fine filter 5 is 300μm, which means it can intercept mud and sand particles, microbial clumps and other suspended impurities with a particle size greater than 300μm, ensuring that the cooling water entering the water-lubricated bearing meets the lubrication and cooling requirements. In one specific embodiment, a parallel backup pipeline 10 is provided on the main water line 2, and a backup cooling water pump 11 is provided on the parallel backup pipeline 10. For ease of distinction, the aforementioned cooling water pump provided on the main water line 2 is defined as the main cooling water pump 4. The flow rates of both the main cooling water pump 4 and the backup cooling water pump 11 are configured to satisfy Q = 1.2DL / min, where D is the shaft diameter supported by the water-lubricated bearing, in mm. When the main cooling water pump 4 fails or needs maintenance, the backup cooling water pump 11 can be started to ensure the continuous operation of the water supply system. Pressure alarms 14 are provided on both the main water line 2 and the main pipeline 7. The pressure alarms 14 are used to monitor the water pressure in the pipeline. When the pressure in the pipeline abnormally rises or falls to a set threshold, an alarm signal is issued to remind operators to promptly check for abnormal conditions such as pipeline blockage, leakage, or pump failure, ensuring the safe operation of the water supply system.

[0021] In one specific embodiment, a drain pipe 12 is connected to the seawater coarse filter 3, and a drain valve 13 is provided on the drain pipe 12. When it is necessary to clean or drain the seawater coarse filter 3, the drain valve 13 is opened to discharge the impurities and accumulated water trapped inside the filter through the drain pipe 12. The drain pipe 12 and the drain valve 13 facilitate the daily maintenance and sewage discharge operation of the seawater coarse filter 3, avoiding the inconvenience caused by disassembly and cleaning.

[0022] Emergency backup water line interface 6 is connected to the main water line 2, and the connection point is located downstream of the automatic backwash fine filter 5. Emergency backup water line interface 6 is used to connect to the ship's freshwater system, which is either an existing freshwater tank or a freshwater circulation system on the ship. An emergency water line valve is installed at emergency backup water line interface 6 to control the flow of freshwater. When the ship is navigating in areas with normal water quality, the emergency water line valve remains closed; when the ship is navigating in shallow water areas or areas with poor water quality, the emergency water line valve is opened to introduce freshwater as a lubricating and cooling medium for the water-lubricated bearings, thereby completely eliminating the corrosion and softening problems of the water-lubricated bearing materials caused by poor water quality. The inlet of the main waterway 7 is connected to the terminal of the main waterway 2. The main waterway 2 is equipped with a main valve 15. By closing the valve of the main waterway 2 and opening the emergency backup waterway interface 6, the emergency backup waterway interface 6 is connected to the main waterway 7. The inlet end of the distributor 8 is connected to the outlet end of the main pipeline 7. There are at least three water inlet branch pipes 9. The inlet end of each water inlet branch pipe 9 is connected to the outlet end of the distributor 8 respectively. The outlet end of each water inlet branch pipe 9 is connected to different circumferential positions of the water-lubricated bearing. The total cross-sectional area of ​​each water inlet branch pipe 9 is configured such that the cooling water flow velocity through each water inlet branch pipe 9 is 2.0m / s to 3.0m / s. In one specific embodiment, the distributor 8 has one inlet end and three outlet ends for evenly dividing the cooling water in the main pipeline 7 into three paths. There are three water inlet branch pipes 9, and the outlet ends of the three water inlet branch pipes 9 are respectively connected to the upper position, the four o'clock position and the eight o'clock position of the water-lubricated bearing. The four o'clock and eight o'clock positions are determined clockwise with the observer facing the end face of the water-lubricated bearing, with the center of the water-lubricated bearing as the center and the twelve o'clock position as the reference. The three inlet branch pipes 9 have the same diameter; in this embodiment, they are all DN40 pipes, and the flow cross-sectional area of ​​a single DN40 branch pipe is approximately 1320 mm². 2 The total cross-sectional area of ​​the three branch pipes is 3960 mm². 2 The total cross-sectional area is matched with the flow rate of the cooling water pump so that the flow velocity of the cooling water flowing through each inlet branch pipe 9 is 2.0m / s to 3.0m / s. Within this flow velocity range, the cooling water has sufficient turbulence intensity to ensure heat exchange efficiency, and will not generate excessive flow resistance due to excessive flow velocity. The number and diameter of the water inlet branch pipes 9 are not limited to the specific values ​​in this embodiment. When the diameter of the water-lubricated bearing shaft changes, the required flow rate can be recalculated according to the flow rate formula, and the number and diameter combination of the branch pipes can be adjusted accordingly, as long as the cooling water flow velocity through each water inlet branch pipe 9 is within the range of 2.0m / s to 3.0m / s.

[0023] In one specific embodiment, the water supply system of the ship's water-lubricated bearing further includes a sealing device, which is disposed at the port axial end of the water-lubricated bearing and fitted onto the shaft supported by the water-lubricated bearing. This device is used to seal the end gap of the water-lubricated bearing and prevent cooling water from leaking into the cabin along the shaft axially. The pressure-bearing capacity of the sealing device is configured to be no less than the pressure corresponding to the ship's draft plus 30m of water column.

[0024] The water supply method for water-lubricated bearings in ships includes the following steps: Water supply steps: The water is supplied from the seawater main pipe 1 through the main water line 2, and then through the seawater coarse filter, pressurized by the main cooling water pump 4, and automatically backwashed fine filter before being delivered to the main pipeline 7. Diversion step: The cooling water in the main pipeline 7 is divided into at least three streams by the diverter 8, and each stream is delivered to different circumferential positions of the water-lubricated bearing through at least three inlet branch pipes 9. The total cross-sectional area of ​​the three inlet branch pipes 9 is configured such that the cooling water flow velocity through each inlet branch pipe 9 is 2.0 m / s to 3.0 m / s. Water source switching procedure: When the ship is sailing in the preset water area, close the main valve 15 and open the emergency backup water circuit interface 6 to switch the water supply source from the main water circuit 2 to the emergency backup water circuit interface 6. The emergency backup water circuit interface 6 is connected to the ship's freshwater system.

[0025] Water supply method for a water supply system of a marine water-lubricated bearing: The implementation of a water supply system for a marine water-lubricated bearing includes the following steps.

[0026] Water supply steps: Under normal water quality conditions, open the main valve 15, close the emergency backup water line interface 6, start the main cooling water pump 4, and draw water from the seawater source through the main water line 2. The seawater is first coarsely filtered by the seawater coarse filter 3 to intercept large suspended solids; then it is pressurized by the main cooling water pump 4 to obtain sufficient flow kinetic energy; subsequently, it is finely filtered by the automatic backwash fine filter 5, which has a filtration accuracy of 300μm, intercepting silt particles and microbial clumps with a particle size greater than 300μm. The finely filtered cooling water is then transported to the distributor 8 through the main pipeline 7. Traffic splitting steps: After the cooling water enters the distributor 8, the distributor 8 evenly divides the cooling water in the main pipeline 7 into three paths, which are then delivered to different circumferential positions of the water-lubricated bearing through three inlet branch pipes 9. The outlet ends of the three inlet branch pipes 9 correspond to the upper position, the four o'clock position, and the eight o'clock position of the water-lubricated bearing, respectively. The total cross-sectional area of ​​the three inlet branch pipes 9 is configured such that the flow velocity of the cooling water flowing through each inlet branch pipe 9 is 2.0 m / s to 3.0 m / s. At this flow velocity, the cooling water can enter the lubrication gap of the water-lubricated bearing at a moderate speed, which not only ensures sufficient cooling and heat exchange effect, but also avoids the deposition of silt under low flow velocity conditions. After entering the water-lubricated bearing from three different positions, the cooling water flows circumferentially inside the water-lubricated bearing to lubricate and cool it. Finally, it is discharged from both ends of the water-lubricated bearing. Since the three inlet branch pipes 9 are arranged asymmetrically, the flow path of the cooling water in the circumferential direction of the water-lubricated bearing is more comprehensive, avoiding the flow dead zone that may occur under symmetrical arrangement, thereby achieving uniform circumferential cooling of the water-lubricated bearing. Water source switching steps: When the vessel is navigating in shallow waters, river mouths, or other areas with poor water quality, the water supply source is switched from the main waterway 2 to the emergency backup waterway interface 6. The main valve 15 is closed, and the emergency backup waterway interface 6 is opened. At this time, the main cooling water pump 4 continues to operate, but the water intake source is switched from seawater to freshwater provided by the vessel's freshwater system. The freshwater flows sequentially through the emergency backup waterway interface 6, the main waterway 7, the distributor 8, and the three inlet branch pipes 9, and finally enters the water-lubricated bearing. Through this switching, the lubrication and cooling medium of the water-lubricated bearing is changed from seawater to freshwater, which completely eliminates the adverse effects of silt and microorganisms in seawater on the water-lubricated bearing material, ensuring the lubrication reliability and cooling effect of the water-lubricated bearing when the vessel is navigating in waters with deteriorating water quality.

[0027] When the vessel leaves the area with poor water quality and returns to the regular seawater area, the above switching operation is performed in reverse: the emergency backup waterway interface 6 is closed, the main valve 15 is opened, and the water supply source is switched from freshwater back to seawater.

[0028] Cooling flow rate calculation: This embodiment provides a specific method for configuring the flow rate of the cooling water pump. Q = 1.2 × D (L / min) Where: Q is the water supply flow rate of the main cooling water pump 4, in L / min; D is the shaft diameter supported by the water-lubricated bearing, in mm.

[0029] Taking a ship with a stern shaft diameter of 400mm and a draft of 5m as an example: Q = 1.2 × 400 = 480 L / min = 28.8 m 3 / h The rated flow rate of the cooling water pump should be configured to be no less than 480 L / min to ensure that the water-lubricated bearings receive sufficient cooling water during operation.

[0030] Based on the aforementioned flow rate and the total cross-sectional area of ​​the three inlet branch pipes, the total cross-sectional area of ​​the three DN40 branch pipes in this embodiment is 3960 mm². 2 The cooling water flow rate within the branch pipe can be checked. Actual flow velocity = Flow rate / Total cross-sectional area = 0.008 m² 3 / s / 0.00396 m 2 ≈ 2.02 m / s The flow velocity falls within the design range of 2.0 m / s to 3.0 m / s, which meets the design requirements. The pressure-bearing capacity of the sealing device is determined based on the ship's draft, and the calculation formula is as follows: P = H + 30 (m water column); Where: P is the equivalent pressure column height of the sealing device, and H is the ship's draft.

[0031] Taking a ship with a draft of 5m as an example: P = 5 + 30 = 35m water column Converted to pressure units: 35m water column ≈ 0.35MPa That is, the design pressure bearing capacity of the sealing device should not be less than 0.35MPa; This invention connects to the main waterway 2 via an emergency backup waterway interface 6, with the connection point located downstream of the automatic backwashing fine filter 5. When the ship is navigating in shallow water or areas with poor water quality, it can switch to the ship's freshwater system supply, fundamentally eliminating the damage to the lubrication interface of the water-lubricated bearing caused by silt particles and microorganisms in seawater. This avoids abnormal wear, corrosion, and softening of the water-lubricated bearing material, ensuring the lubrication reliability of the water-lubricated bearing when the ship is navigating in complex waters. Furthermore, based on the flow calculation formula Q = 1.2D (L / min) of the shaft diameter D, the flow rate of the cooling water pump is precisely configured to ensure that the water-lubricated bearing receives sufficient cooling water flow under all operating conditions, avoiding insufficient water supply caused by experience-based design. An asymmetrical pipeline design is adopted, with three water inlet branch pipes 9 arranged above the water-lubricated bearing, at the four o'clock and eight o'clock positions, respectively, achieving uniform circumferential cooling of the water-lubricated bearing and eliminating local overheating and local wear phenomena.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water supply system for a marine water-lubricated bearing, characterized in that, include: The main waterway (2) is connected to the seawater main pipe (1) at its inlet end. A seawater coarse filter (3), a main cooling water pump (4) and an automatic backwash fine filter (5) are respectively installed on the main waterway (2) along the water flow direction. Emergency backup waterway interface (6), which is connected to the main waterway (2) and used to connect to the ship's freshwater system; The main waterway (7) is connected to the terminal of the main waterway (2) at its inlet end; Diverter (8), the inlet end of which is connected to the outlet end of the main pipeline (7); At least three water inlet branches (9) are provided, with the inlet end of each water inlet branch (9) connected to the outlet end of the distributor (8), and the outlet end of each water inlet branch (9) connected to different circumferential positions of the water-lubricated bearing. The total cross-sectional area of ​​each water inlet branch (9) is configured such that the cooling water flow velocity through each water inlet branch (9) is 2.0 m / s to 3.0 m / s.

2. The water supply system for a marine water-lubricated bearing according to claim 1, characterized in that, The main waterway (2) is equipped with a parallel backup pipeline (10), and the parallel backup pipeline (10) is equipped with a backup cooling water pump (11).

3. The water supply system for a marine water-lubricated bearing according to claim 2, characterized in that, The flow rates of the main cooling water pump (4) and the standby cooling water pump (11) are both configured to satisfy Q = 1.2DL / min, where D is the shaft diameter supported by the water-lubricated bearing in mm.

4. The water supply system for a marine water-lubricated bearing according to claim 1, characterized in that, The number of water inlet branch pipes (9) is three, and the outlet ends of the three water inlet branch pipes (9) are respectively connected to the upper position, the four o'clock position and the eight o'clock position of the water lubricated bearing.

5. The water supply system for a marine water-lubricated bearing according to claim 1, characterized in that, The automatic backwashing fine filter (5) has a filtration accuracy of 300 μm; A drain pipe (12) is connected to the seawater coarse filter (3), and a drain valve (13) is provided on the drain pipe (12).

6. The water supply system for a marine water-lubricated bearing according to claim 1, characterized in that, Pressure alarms (14) are installed on both the main waterway (2) and the main pipeline (7).

7. The water supply system for a marine water-lubricated bearing according to claim 1, characterized in that, The main waterway (2) is equipped with a main valve (15). By closing the main waterway (2) valve and opening the emergency backup waterway interface (6), the emergency backup waterway interface (6) is connected to the main waterway (7).

8. The water supply system for a marine water-lubricated bearing according to claim 1, characterized in that, It also includes a sealing device, which is disposed at the port axial end of the water-lubricated bearing and fitted onto the shaft supported by the water-lubricated bearing, for sealing the end gap of the water-lubricated bearing. The pressure bearing capacity of the sealing device is configured to be no less than the pressure corresponding to the ship's draft plus 30m water column.

9. A water supply method based on the water supply system of a ship water-lubricated bearing according to any one of claims 1-8, characterized in that, Includes the following steps: Water supply steps: The water is supplied from the main seawater pipe (1) through the main waterway (2), and then through the seawater coarse filter, pressurized by the main cooling water pump (4), and automatically backwashed for fine filtration before being delivered to the main pipeline (7). Diversion step: The cooling water in the main pipeline (7) is divided into at least three streams by the diverter (8), and each stream is delivered to different circumferential positions of the water-lubricated bearing through at least three inlet branch pipes (9); The total cross-sectional area of ​​the three inlet branch pipes (9) is configured such that the flow velocity of the cooling water flowing through each inlet branch pipe (9) is 2.0 m / s to 3.0 m / s; Water source switching steps: When the ship is sailing in the preset water area, close the main valve (15) and open the emergency backup water channel interface (6) to switch the water supply source from the main water channel (2) to the emergency backup water channel interface (6). The emergency backup water channel interface (6) is connected to the ship's freshwater system.

10. The water supply method of the water supply system for a marine water-lubricated bearing according to claim 9, characterized in that, It also includes a sealing step: the end gap of the water-lubricated bearing is sealed by a sealing device located at the port axial end of the water-lubricated bearing and fitted onto the shaft, wherein the pressure bearing capacity of the sealing device is not less than the pressure corresponding to the ship's draft plus 30m water column.

Images