Hydrogen fuel cell powered ship stern tube lubrication pipe system and control method thereof

Abstract

The present invention provides a hydrogen fuel cell powered stern tube lubrication pipe system and its control method. The engine is connected to a lubricating oil pump, and the lubricating oil pump outlet pipe is connected to the interior of the stern piston support seat through a control valve. The control valve includes a pressure regulating valve and a temperature regulating valve. The valve of the pressure regulating valve and the valve ring of the temperature regulating valve are connected through a valve stem, and the upper end of the pressure regulating valve is connected to a pressure regulating valve. A cooling lubricating oil tank is also provided, which is connected to the temperature regulating valve of the control valve through the lubricating oil pump. The pressure regulating valve controls the pressure to open the pressure regulating valve to release pressure and discharge oil, and the temperature regulating valve opens the valve ring to discharge oil based on the temperature. The oil pipeline is connected to the oil inlet of the control valve, and oil is discharged from the third oil outlet of the temperature regulating valve of the control valve. When high temperature or high pressure occurs, the pressure regulating valve and the temperature regulating valve open simultaneously to deliver lubricating oil. This does not require electric control and adopts a mechanical structure, which has a long service life and good lubricating oil delivery effect.

Description

Technical Field

[0001] The present invention relates to the field of ship stern tube lubrication, and in particular to a hydrogen fuel cell powered ship stern tube lubrication pipe system and a control method thereof. Background Art

[0002] The working conditions of a ship's stern shaft are extremely harsh. In addition to being subjected to severe wear, friction and high temperatures, it also has to withstand the pressure difference between the outboard water pressure and the static pressure of the lubricating oil. Driven by the engine, the ship's stern shaft increases in speed, and the propeller speed accelerates. The lubricating oil inside the propeller drive shaft and the stern piston support seat will be centrifuged as the drive shaft rotates, and the lubricating fluid will swirl against the inner wall of the stern piston support seat. The lubricating oil inside the stern piston support seat needs to be pressurized to replenish the oil. As the engine speed increases, the pressure of the lubricating oil pump increases, and the pressure of the lubricating oil in the delivery pipe increases. The high-pressure lubricating oil will directly enter the stern piston support seat. Prolonged delivery causes excessive pressure in the stern piston support seat, leading to malfunction of the stern piston support seat sealing device. Once the stern shaft seal fails, not only will a large amount of seawater intrude into the stern tube, but it will also accelerate damage to the stern tube and stern bearing.

[0003] When the stern piston support seat is severely worn and friction is high, long-term lubrication with high-temperature lubricating oil will also cause operational failure of the sealing device. Once the stern shaft seal fails, not only will a large amount of seawater invade the stern tube, but it will also accelerate the damage of the stern tube and stern bearing.

[0004] The current solution is to use temperature sensors and pressure sensors to monitor the internal pressure of the stern piston support seat, and then control the opening or closing of the electric valve to pressurize the inside of the stern piston support seat, and also to supply cooled lubricating oil to the inside of the stern piston support seat. However, the temperature sensor and pressure sensor have a high failure rate in coordination with the electric valve. Once damaged, the inside of the stern piston support seat is easily damaged. Summary of the Invention

[0005] The main purpose of the present invention is to provide a hydrogen fuel cell powered ship stern tube lubrication pipe system and its control method, so as to solve the problem that the temperature sensor and pressure sensor have a high probability of failure in coordination with the electric valve, and when damaged, the internal part of the stern piston support seat is easily damaged.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a hydrogen fuel cell powered ship stern tube lubrication pipe system, the engine is connected to the lubricating oil pump, the lubricating oil pump outlet pipe is connected to the inside of the stern piston support seat through a control valve, the control valve includes a pressure regulating valve and a temperature regulating valve, the valve of the pressure regulating valve is connected to the valve ring of the temperature regulating valve through a valve stem, and the upper end of the pressure regulating valve is connected to the pressure stabilizing valve;

[0007] A cooling lubricating oil tank is also provided, which is connected to the temperature regulating valve of the control valve through a lubricating oil pump;

[0008] The pressure regulating valve controls the pressure to open the pressure regulating valve to release the pressure and discharge the oil, and the temperature regulating valve opens the valve ring to discharge the oil according to the temperature;

[0009] The oil delivery pipeline is communicated with the oil inlet of the control valve, and oil is discharged from the third oil outlet of the temperature regulating valve of the control valve.

[0010] In the preferred embodiment, the first valve seat of the pressure-stabilizing valve is connected to the second valve cover, a first diaphragm is provided between the first valve seat and the first valve cover, a piston is provided inside the first valve seat, the first diaphragm is connected to the piston, the first diaphragm and the piston divide the internal cavity of the first valve seat into two upper and lower sealed cavities, the lower sealed cavity is connected to the second valve cover, the valve stem passes through the second valve cover and is coaxially arranged with the piston, a distance is left between the second valve cover and the piston, and the valve stem and the second valve cover are sealed and slidably connected.

[0011] In the preferred embodiment, the upper sealed cavity of the first valve seat is connected to the first oil inlet, the first oil inlet is connected to the second oil inlet of the pressure regulating valve through a one-way valve, and the lower sealed cavity of the first valve seat is connected to the second oil outlet through the first oil outlet.

[0012] In a preferred embodiment, the adjusting screw is threadedly connected to the top of the first valve cover, and a spring is provided between the lower end of the adjusting screw and the piston.

[0013] In the preferred embodiment, the second valve cover is connected to the first oil inlet of the pressure-stabilizing valve, a second diaphragm is provided between the second valve cover and the second valve seat, the second diaphragm is connected to the valve, the valve is connected to the valve stem, and the valve cooperates with the second valve seat to connect and disconnect the second oil inlet.

[0014] In a preferred embodiment, a pressure gauge is further provided between the second oil inlet and the first oil inlet.

[0015] In the preferred embodiment, the valve stem passes through the second valve seat and is connected to the lifting cylinder inside the temperature regulating valve, the lifting cylinder is sealed with the sealing plug at the end of the fixed rod, the fixed rod body passes through the tail end of the lifting cylinder and is connected to the fixed frame, and the fixed frame is connected to the flow seat.

[0016] In the preferred embodiment, the circulation seat includes a third oil inlet, a third oil outlet and a fourth oil outlet. A protruding valve ring is provided on the outer ring of the lower end of the lifting cylinder body. The valve ring rests on the fourth oil outlet, so that the third oil inlet and the fourth oil outlet are connected and disconnected, and the third oil inlet and the third oil outlet are in a normally connected state.

[0017] In a preferred embodiment, an expansion agent is provided between the lifting cylinder and the sealing plug at the end of the fixed rod.

[0018] The method includes:

[0019] S1: When the engine speed is low, the lubricating oil pump inputs the lubricating oil to the third oil inlet of the control valve, and outputs the lubricating oil to the inside of the stern piston support seat through the third oil outlet, completing low-pressure lubricating oil pumping;

[0020] S2. When the engine speed is high, the propeller speed increases, and the lubricating oil inside the stern piston support seat needs to be pressurized. The lubricating oil pump increases the pressure as the engine speed increases, and the pressure of the lubricating oil in the delivery pipe increases. High-pressure lubricating oil enters the first oil inlet of the control valve. High-pressure lubrication creates high pressure inside the first valve seat, pushing the first diaphragm. The first diaphragm expands, causing the piston to open, and a passage is formed between the first oil inlet and the first oil outlet.

[0021] The high-pressure lubricating oil pushes the valve inside the second oil inlet, and the lubricating oil inside the second valve cover enters the first oil inlet, forming a connection and disconnection between the second oil outlet and the second oil inlet. The high-pressure lubricating oil enters the interior of the stern piston support seat from the second oil inlet through the large-diameter second oil outlet, completing the high-pressure lubricating oil pumping;

[0022] S3. When the engine speed decreases from high to low, the pressure inside the lubricating oil pipeline decreases, and the pressure on both sides of the second oil outlet and the second oil inlet decreases. The spring pushes the piston to close the first valve seat, and the interior of the second valve cover is filled with lubricating oil. The valve presses down against the valve seat, and the second oil outlet is disconnected from the second oil inlet. Lubricating oil is input from the third oil inlet and output from the third oil outlet to the interior of the stern piston support seat, completing low-pressure lubricating oil pumping.

[0023] S4. The engine runs at high or low speed for a long time, causing the lubricating oil temperature inside the stern piston support seat to increase.

[0024] Then, low-temperature lubricating oil is extracted from the cooled lubricating oil tank and transported from the third large-diameter oil inlet to the fourth oil outlet. The high-temperature lubricating oil circulates inside the circulation seat. When the high-temperature lubricating oil is heated, the expansion agent inside the lifting cylinder body expands, and the lifting cylinder body drives the valve ring to rise. The third oil inlet and the fourth oil outlet form a passage, and the high-temperature lubricating oil is transported from the third large-diameter oil inlet to the fourth oil outlet. The fourth oil outlet is transported to the inside of the stern piston support seat, thereby accelerating the circulation of the lubricating oil, reducing the temperature of the lubricating oil inside the stern piston support seat, and completing the high-temperature lubricating oil pumping;

[0025] When the temperature of the lubricating oil decreases, the expansion agent contracts, the lifting cylinder descends, the valve ring abuts against the fourth oil outlet, and the third oil inlet and the fourth oil outlet are closed;

[0026] S5. When high-temperature lubricating oil or high-pressure lubricating oil is delivered from the control valve, the valve and the valve ring are installed on the valve stem, and the valve and the valve ring are synchronized. When high-temperature lubricating oil or high-pressure lubricating oil is delivered, the valve and the valve ring will open synchronously to deliver the lubricating oil.

[0027] The present invention provides a stern pipe lubrication pipe system of a hydrogen fuel cell powered ship and a control method thereof, wherein a control valve is utilized instead of a temperature sensor and a pressure sensor, and the pressure regulating valve regulates the pressure in the lubricating oil pipeline, opens to deliver high-pressure lubricating oil when high pressure occurs, and closes when the lubricating oil pressure decreases, and no longer delivers lubricating oil, and the lubricating oil is delivered normally, thereby ensuring that the stern piston support seat does not deliver large-flow lubricating oil for a long time, and ensuring the lubricating oil pressure inside the stern piston support seat. When the temperature of the lubricating oil inside the stern piston support seat is high, the temperature regulating valve opens to deliver the lubricating oil inside the cooling lubricating oil tank into the interior of the stern piston support seat, so as to cool the interior of the stern piston support seat. The pressure regulating valve and the temperature regulating valve are connected by the same valve stem, and when high temperature or high pressure occurs, the pressure regulating valve and the temperature regulating valve are opened at the same time to deliver lubricating oil, without the need for electric control, and adopts a mechanical structure, with a long service life and a good effect of delivering lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0029] Figure 1 This is a main structural diagram of the cleaning process of the present invention;

[0030] Figure 2 This is a diagram of the overall appearance of the present invention;

[0031] Figure 3 This is a structural diagram of the ejection protection shell of the ejection device of the present invention;

[0032] Figure 4 This is a structural diagram of the cover plate disassembly of the overall protective shell of the present invention.

[0033] In the figure: engine 1; lubricating oil pump 2; control valve 3; pressure regulating valve 301; adjusting screw 3011; first valve cover 3012; spring 3013; first diaphragm 3014; piston 3015; first valve seat 3016; first oil inlet 3017; first oil outlet 3018; pressure regulating valve 302; second valve cover 3021; second diaphragm 3022; valve 2023; second valve seat 2024; first Second oil outlet 3025; second oil inlet 3026; temperature regulating valve 303; third oil inlet 3031; third oil outlet 3032; fourth oil outlet 3033; fixing bracket 3034; valve ring 3035; fixing rod 3036; expansion agent 3037; lifting cylinder 3038; circulation seat 3039; valve stem 304; pressure gauge 305; one-way valve 306; stern piston support seat 4; propeller 5. DETAILED DESCRIPTION

[0034] Example 1

[0035] like Figures 1 to 4As shown, a stern tube lubrication pipe system for a hydrogen fuel cell powered ship is shown. The engine 1 is connected to a lubricating oil pump 2. The oil outlet pipe of the lubricating oil pump 2 is connected to the interior of the stern piston support seat 4 through a control valve 3. The control valve 3 includes a pressure regulating valve 302 and a temperature regulating valve 303. The valve 2023 of the pressure regulating valve 302 is connected to the valve ring 3035 of the temperature regulating valve 303 through a valve stem 304. The upper end of the pressure regulating valve 302 is connected to the pressure regulating valve 301. A cooling lubricating oil tank is also provided, which is connected to the temperature regulating valve 303 of the control valve 3 through the lubricating oil pump 2. The pressure regulating valve 301 controls the pressure to open the pressure regulating valve 302 to relieve pressure and discharge oil. The temperature regulating valve 303 opens the valve ring 3035 through the temperature to discharge oil. The oil pipeline is connected to the oil inlet of the control valve 3, and oil is discharged from the third oil outlet 3032 of the temperature regulating valve 303 of the control valve 3. The control valve 3 is used to replace the temperature sensor and the pressure sensor, and the pressure regulating valve 302 regulates the pressure in the lubricating oil pipeline. When high pressure occurs, it is opened to deliver high-pressure lubricating oil. When the lubricating oil pressure decreases, the pressure regulating valve 302 is closed and no longer delivers lubricating oil. The lubricating oil is delivered normally to ensure that the stern piston support seat 4 does not deliver large-flow lubricating oil for a long time, and the lubricating oil pressure inside the stern piston support seat 4 is guaranteed. When the temperature of the lubricating oil inside the stern piston support seat 4 is high, the temperature regulating valve 303 is opened to deliver the lubricating oil inside the cooling lubricating oil tank into the inside of the stern piston support seat 4 to cool the inside of the stern piston support seat 4. The pressure regulating valve 302 and the temperature regulating valve 303 are connected by the same valve stem 304. When high temperature or high pressure occurs, the pressure regulating valve 302 and the temperature regulating valve 303 are opened at the same time to deliver lubricating oil.

[0036] In the preferred embodiment, the first valve seat 3016 of the pressure-stabilizing valve 301 is connected to the second valve cover 3021, a first diaphragm 3014 is provided between the first valve seat 3016 and the first valve cover 3012, a piston 3015 is provided inside the first valve seat 3016, the first diaphragm 3014 is connected to the piston 3015, the first diaphragm 3014 and the piston 3015 divide the internal cavity of the first valve seat 3016 into two upper and lower sealed cavities, the lower sealed cavity is connected to the second valve cover 3021, the valve stem 304 passes through the second valve cover 3021 and is coaxially arranged with the piston 3015, a distance is left between the second valve cover 3021 and the piston 3015, and the valve stem 304 is sealed and slidably connected to the second valve cover 3021. The sealed cavity above the first valve seat 3016 communicates with the first oil inlet 3017, which in turn communicates with the second oil inlet 3026 of the pressure regulating valve 302 via the one-way valve 306. The sealed cavity below the first valve seat 3016 communicates with the second oil outlet 3025 via the first oil outlet 3018. The pressure-stabilizing valve 301 and the pressure regulating valve 302 cooperate, allowing high-pressure lubricating oil to enter the first oil inlet 3017 of the control valve 3. This high-pressure lubrication creates a high pressure inside the first valve seat 3016, pushing against the first diaphragm 3014. The expansion of the first diaphragm 3014 causes the piston 3015 to open, forming a passage between the first oil inlet 3017 and the first oil outlet 3018.

[0037] The high-pressure lubricating oil pushes the valve 2023 inside the second oil inlet 3026, and the lubricating oil inside the second valve cover 3021 enters the first oil inlet 3017, so that the second oil outlet 3025 and the second oil inlet 3026 are connected and disconnected. The high-pressure lubricating oil enters the stern piston support seat 4 from the second oil inlet 3026 through the large-diameter second oil outlet 3025, completing the high-pressure lubricating oil pumping.

[0038] In the preferred embodiment, the adjusting screw 3011 is threadedly connected to the top of the first valve cover 3012, and a spring 3013 is provided between the lower end of the adjusting screw 3011 and the piston 3015. The adjusting screw 3011 adjusts the lifting pressure of the piston 3015 and adjusts the pressure when the pressure regulating valve 302 is opened or closed.

[0039] In the preferred embodiment, the second valve housing 3021 is connected to the first oil inlet 3017 of the pressure-stabilizing valve 301. A second diaphragm 3022 is disposed between the second valve housing 3021 and the second valve seat 2024. The second diaphragm 3022 is connected to the valve 2023, which is connected to the valve stem 304. The valve 2023 cooperates with the second valve seat 2024 to establish a connection and a disconnection between the second oil inlet 3026 and the second oil inlet 3026. High-pressure lubricating oil pushes against the valve 2023 within the second oil inlet 3026. The lubricating oil within the second valve housing 3021 enters the first oil inlet 3017, establishing a connection and a disconnection between the second oil outlet 3025 and the second oil inlet 3026. The high-pressure lubricating oil then flows through the large-diameter second oil outlet 3025 and the second oil inlet 3026 into the interior of the stern piston support seat 4, completing the high-pressure lubricating oil pumping.

[0040] In a preferred embodiment, a pressure gauge 305 is further provided between the second oil inlet 3026 and the first oil inlet 3017 . The pressure gauge 305 monitors the pressure inside the second oil inlet 3026 .

[0041] In the preferred embodiment, the valve stem 304 passes through the second valve seat 2024 and is connected to the lift cylinder 3038 inside the temperature control valve 303. The interior of the lift cylinder 3038 is sealed with a sealing plug at the end of the fixed rod 3036. The body of the fixed rod 3036 passes through the rear end of the lift cylinder 3038 and is connected to the fixed bracket 3034. The fixed bracket 3034 is connected to the circulation seat 3039. The circulation seat 3039 includes a third oil inlet 3031, a third oil outlet 3032, and a fourth oil outlet 3033. A protruding valve ring 3035 is provided on the outer ring of the lower end of the lift cylinder 3038. The valve ring 3035 abuts against the fourth oil outlet 3033, connecting and disconnecting the third oil inlet 3031 and the fourth oil outlet 3033. The third oil inlet 3031 and the third oil outlet 3032 are normally connected. An expansion agent 3037 is provided between the lifting cylinder 3038 and the sealing plug at the end of the fixing rod 3036. When the engine 1 rotates at a high speed or a low speed for a long time, the temperature of the lubricating oil inside the stern piston support seat 4 increases.

[0042] Then, low-temperature lubricating oil is extracted from the cooled lubricating oil tank and transported from the third large-diameter oil inlet 3031 to the fourth oil outlet 3033. The high-temperature lubricating oil circulates inside the circulation seat 3039. When the high-temperature lubricating oil is heated, the expansion agent 3037 inside the lifting cylinder 3038 expands, and the lifting cylinder 3038 drives the valve ring 3035 to rise. The third oil inlet 3031 and the fourth oil outlet 3033 form a passage, and the high-temperature lubricating oil is transported from the third large-diameter oil inlet 3031 to the fourth oil outlet 3033. The fourth oil outlet 3033 is transported to the inside of the stern piston support seat 4, thereby accelerating the circulation of the lubricating oil, reducing the temperature of the lubricating oil inside the stern piston support seat 4, and completing the pumping of the high-temperature lubricating oil.

[0043] After the temperature of the lubricating oil decreases, the expansion agent 3037 contracts, the lifting cylinder 3038 descends, the valve ring 3035 abuts against the fourth oil outlet 3033 , and the third oil inlet 3031 and the fourth oil outlet 3033 are closed.

[0044] Example 2

[0045] Further illustrate with reference to Example 1, Figure 1-4 The structure shown in FIG. 1 includes the following steps: when the engine 1 rotates at a low speed, the lubricating oil pump 2 inputs the lubricating oil into the third oil inlet 3031 of the control valve 3, and outputs the lubricating oil through the third oil outlet 3032 to the interior of the stern piston support seat 4, thereby completing low-pressure lubricating oil pumping.

[0046] When the engine 1 rotates at a high speed, the propeller 5 rotates faster, and the lubricating oil inside the stern piston support seat 4 needs to be pressurized. The lubricating oil pump 2 increases the pressure as the engine 1 rotates, and the pressure of the lubricating oil in the delivery pipe increases. High-pressure lubricating oil enters from the first oil inlet 3017 of the control valve 3. High-pressure lubrication forms high pressure inside the first valve seat 3016 to push the first diaphragm 3014. The first diaphragm 3014 expands to open the piston 3015, and the first oil inlet 3017 and the first oil outlet 3018 form a passage.

[0047] The high-pressure lubricating oil pushes the valve 2023 inside the second oil inlet 3026, and the lubricating oil inside the second valve cover 3021 enters the first oil inlet 3017, so that the second oil outlet 3025 and the second oil inlet 3026 are connected and disconnected. The high-pressure lubricating oil enters the stern piston support seat 4 from the second oil inlet 3026 through the large-diameter second oil outlet 3025, completing the high-pressure lubricating oil pumping.

[0048] When the speed of the engine 1 decreases from a high speed to a low speed, the pressure inside the lubricating oil pipeline decreases, and the pressure on both sides of the second oil outlet 3025 and the second oil inlet 3026 decreases. The spring 3013 pushes the piston 3015 to close the first valve seat 3016. The interior of the second valve cover 3021 is filled with lubricating oil, the valve 2023 presses downward against the valve seat 2024, the second oil outlet 3025 is disconnected from the second oil inlet 3026, and the lubricating oil is input from the third oil inlet 3031, and output from the third oil outlet 3032 to the inside of the stern piston support seat 4, completing the low-pressure lubricating oil pumping.

[0049] The engine 1 rotates at a high speed or a low speed for a long time, and the temperature of the lubricating oil inside the stern piston support seat 4 increases.

[0050] Then, low-temperature lubricating oil is extracted from the cooled lubricating oil tank and transported from the third large-diameter oil inlet 3031 to the fourth oil outlet 3033. The high-temperature lubricating oil circulates inside the circulation seat 3039. When the high-temperature lubricating oil is heated, the expansion agent 3037 inside the lifting cylinder 3038 expands, and the lifting cylinder 3038 drives the valve ring 3035 to rise. The third oil inlet 3031 and the fourth oil outlet 3033 form a passage, and the high-temperature lubricating oil is transported from the third large-diameter oil inlet 3031 to the fourth oil outlet 3033. The fourth oil outlet 3033 is transported to the inside of the stern piston support seat 4, thereby accelerating the circulation of the lubricating oil, reducing the temperature of the lubricating oil inside the stern piston support seat 4, and completing the pumping of the high-temperature lubricating oil.

[0051] After the temperature of the lubricating oil decreases, the expansion agent 3037 contracts, the lifting cylinder 3038 descends, the valve ring 3035 abuts against the fourth oil outlet 3033 , and the third oil inlet 3031 and the fourth oil outlet 3033 are closed.

[0052] When high-temperature lubricating oil or high-pressure lubricating oil is delivered from the control valve 3, the valve 2023 and the valve ring 3035 are both installed on the valve stem 304, and the valve 2023 and the valve ring 3035 are synchronized. When high-temperature lubricating oil or high-pressure lubricating oil is delivered, the valve 2023 and the valve ring 3035 will open synchronously to deliver the lubricating oil.

[0053] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A stern tube lubrication pipe system for a hydrogen fuel cell powered ship, characterized by: The engine (1) is connected to the lubricating oil pump (2), the oil outlet pipe of the lubricating oil pump (2) is connected to the interior of the stern piston support seat (4) through the control valve (3), the control valve (3) includes a pressure regulating valve (302) and a temperature regulating valve (303), the valve (2023) of the pressure regulating valve (302) and the valve ring (3035) of the temperature regulating valve (303) are connected through the valve stem (304), and the upper end of the pressure regulating valve (302) is connected to the pressure stabilizing valve (301); A cooling lubricating oil tank is also provided, and the cooling lubricating oil tank is connected to the temperature regulating valve (303) of the control valve (3) through the lubricating oil pump (2); The pressure regulating valve (301) controls the pressure to open the pressure regulating valve (302) to release the pressure and discharge the oil, and the temperature regulating valve (303) opens the valve ring (3035) according to the temperature to discharge the oil; The oil delivery pipeline is connected to the oil inlet of the control valve (3), and oil is discharged from the third oil outlet (3032) of the temperature regulating valve (303) of the control valve (3); The first valve seat (3016) of the pressure-stabilizing valve (301) is connected to the second valve cover (3021), a first diaphragm (3014) is provided between the first valve seat (3016) and the first valve cover (3012), a piston (3015) is provided inside the first valve seat (3016), the first diaphragm (3014) is connected to the piston (3015), the first diaphragm (3014) and the piston (3015) divide the internal cavity of the first valve seat (3016) into two upper and lower sealed cavities, the lower sealed cavity is connected to the second valve cover (3021), the valve stem (304) passes through the second valve cover (3021) and is coaxially arranged with the piston (3015), a distance is left between the second valve cover (3021) and the piston (3015), and the valve stem (304) and the second valve cover (3021) are sealed and slidably connected; The second valve cover (3021) is in communication with the first oil inlet (3017) of the pressure-stabilizing valve (301); a second diaphragm (3022) is provided between the second valve cover (3021) and the second valve seat (2024); the second diaphragm (3022) is connected to the valve (2023); the valve (2023) is connected to the valve stem (304); the valve (2023) cooperates with the second valve seat (2024) to connect and disconnect the second oil inlet (3026); The valve stem (304) passes through the second valve seat (2024) and is connected to the lifting cylinder (3038) inside the temperature regulating valve (303). The interior of the lifting cylinder (3038) is sealed with a sealing plug at the end of the fixed rod (3036). The rod body of the fixed rod (3036) passes through the tail end of the lifting cylinder (3038) and is connected to the fixing frame (3034). The fixing frame (3034) is connected to the circulation seat (3039).

2. The hydrogen fuel cell powered ship stern tube lubrication pipe system according to claim 1, characterized in that: The upper sealing cavity of the first valve seat (3016) is communicated with the first oil inlet (3017), the first oil inlet (3017) is communicated with the second oil inlet (3026) of the pressure regulating valve (302) through the one-way valve (306), and the lower sealing cavity of the first valve seat (3016) is communicated with the second oil outlet (3025) through the first oil outlet (3018).

3. The hydrogen fuel cell powered ship stern tube lubrication pipe system according to claim 2, characterized in that: The adjusting screw (3011) is threadedly connected to the top of the first valve cover (3012), and a spring (3013) is provided between the lower end of the adjusting screw (3011) and the piston (3015).

4. The hydrogen fuel cell powered ship stern tube lubrication pipe system according to claim 3, characterized in that: A pressure gauge (305) is further provided between the second oil inlet (3026) and the first oil inlet (3017).

5. The hydrogen fuel cell powered ship stern tube lubrication pipe system according to claim 4, characterized in that: The circulation seat (3039) includes a third oil inlet (3031), a third oil outlet (3032) and a fourth oil outlet (3033). The outer ring of the lower end of the lifting cylinder (3038) is provided with a protruding valve ring (3035). The valve ring (3035) abuts against the fourth oil outlet (3033), so that the third oil inlet (3031) and the fourth oil outlet (3033) are connected and disconnected, and the third oil inlet (3031) and the third oil outlet (3032) are in a normally connected state.

6. The hydrogen fuel cell powered ship stern tube lubrication pipe system according to claim 5, characterized in that: An expansion agent (3037) is provided between the lifting cylinder (3038) and the sealing plug at the end of the fixing rod (3036).

7. The control method for a stern tube lubrication pipe system of a hydrogen fuel cell powered ship according to claim 6, characterized in that: The method includes: S1. When the engine (1) rotates at a low speed, the lubricating oil pump (2) inputs the lubricating oil into the third oil inlet (3031) of the control valve (3), and the third oil outlet (3032) outputs the lubricating oil to the interior of the stern piston support seat (4), thereby completing low-pressure lubricating oil pumping; S2. When the engine (1) rotates at a high speed, the propeller (5) rotates at a faster speed, and the lubricating oil inside the stern piston support seat (4) needs to be pressurized. The lubricating oil pump (2) increases the pressure as the engine (1) rotates at a higher speed, and the pressure of the lubricating oil in the delivery pipe increases. High-pressure lubricating oil enters from the first oil inlet (3017) of the control valve (3). High-pressure lubrication forms a high-pressure push on the first diaphragm (3014) inside the first valve seat (3016). The first diaphragm (3014) expands to open the piston (3015), and a passage is formed between the first oil inlet (3017) and the first oil outlet (3018); The high-pressure lubricating oil pushes the valve (2023) inside the second oil inlet (3026), and the lubricating oil inside the second valve cover (3021) enters the first oil inlet (3017), so that the second oil outlet (3025) and the second oil inlet (3026) are connected and disconnected. The high-pressure lubricating oil enters the interior of the stern piston support seat (4) from the second oil inlet (3026) through the large-diameter second oil outlet (3025), completing the high-pressure lubricating oil pumping; S3. When the engine (1) speed decreases from high speed to low speed, the pressure inside the lubricating oil pipeline decreases, the pressure on both sides of the second oil outlet (3025) and the second oil inlet (3026) decreases, the spring (3013) pushes the piston (3015) to close the first valve seat (3016), the interior of the second valve cover (3021) is filled with lubricating oil, the valve (2023) presses downward against the valve seat (2024), the second oil outlet (3025) is disconnected from the second oil inlet (3026), the lubricating oil is input from the third oil inlet (3031), and the third oil outlet (3032) is output to the interior of the stern piston support seat (4), completing the low-pressure lubricating oil pumping; S4. The engine (1) rotates at a high speed or a low speed for a long time, and the temperature of the lubricating oil inside the stern piston support seat (4) increases; High-temperature lubricating oil enters from the third oil inlet (3031), circulates inside the circulation seat (3039), and the expansion agent (3037) inside the lifting cylinder (3038) expands due to the heat of the high-temperature lubricating oil. The lifting cylinder (3038) drives the valve ring (3035) to rise, and the third oil inlet (3031) and the fourth oil outlet (3033) form a passage. Then, low-temperature lubricating oil is extracted from the cooled lubricating oil tank and transported from the third oil inlet (3031) with a large diameter to the fourth oil outlet (3033). The fourth oil outlet (3033) is then transported to the interior of the stern piston support seat (4), thereby accelerating the circulation of the lubricating oil, reducing the temperature of the lubricating oil inside the stern piston support seat (4), and completing the high-temperature lubricating oil pumping. After the temperature of the lubricating oil decreases, the expansion agent (3037) contracts, the lifting cylinder (3038) descends, the valve ring (3035) abuts against the fourth oil outlet (3033), and the third oil inlet (3031) and the fourth oil outlet (3033) are closed; S5. When high-temperature lubricating oil or high-pressure lubricating oil is delivered from the control valve (3), the valve (2023) and the valve ring (3035) are both installed on the valve stem (304). The valve (2023) and the valve ring (3035) are synchronized. When high-temperature lubricating oil or high-pressure lubricating oil is delivered, the valve (2023) and the valve ring (3035) are opened synchronously to deliver the lubricating oil.

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