Adjusting method for achieving automatic balance of lubricating oil quantity in oil pan of marine diesel engine

Abstract

An adjusting method for achieving automatic balance of lubricating oil in an oil pan of a marine diesel engine comprises the steps that firstly, an oil suction pipe and an oil supplementing pipe are installed in the oil pan, a pipe opening of the oil suction pipe is vertically upward and away from the bottom of the oil pan by a preset height, and a pipe opening of the oil supplementing pipe is close to the bottom of the oil pan; (2) installing a balance oil tank and connecting the balance oil tank with an oil pan through an oil suction pump and an oil recharging pump with the displacement smaller than that of the oil suction pump, (3) injecting lubricating oil into the balance oil tank and the oil pan, and (4) starting the oil suction pump and the oil recharging pump to work continuously at the same time when the diesel engine runs, and conveying the lubricating oil in the balance oil tank into the oil pan through the oil recharging pump; when the liquid level of the lubricating oil in the oil pan exceeds the height of the orifice of the oil suction pipe, the oil suction pump pumps the lubricating oil higher than the orifice of the oil suction pipe back to the balance oil tank from the oil pan, so that the liquid level of the lubricating oil is always kept at the height of the orifice of the oil suction pipe, and stable and automatic balance of the amount of the lubricating oil in the oil pan is achieved. The liquid level of the oil pan is kept dynamic and constant during working, the requirement of the diesel engine for lubricating oil is guaranteed, and the device has the advantages of being simple in structure, convenient to operate, capable of running automatically, safe and reliable.

Description

Technical Field

[0001] This invention relates to the lubrication system of marine diesel engines, and particularly to an adjustment method for automatically balancing the amount of lubricating oil in the oil pan of a marine diesel engine, belonging to the technical field of marine diesel engine technology. Background Technology

[0002] Marine diesel engines are equipped with an oil pan at the bottom to store the lubricating oil required for engine operation. Please refer to [link / reference]. Figure 1 When the diesel engine is running, the oil pump draws lubricating oil from the oil pan 1 through the oil extraction pipe 2 and enters the various lubrication systems of the diesel engine. After lubricating and cooling the moving parts of the relevant marine diesel engine, the lubricating oil flows back into the oil pan 1. Marine diesel engines are usually equipped with an oil filler port for adding lubricating oil. In order to monitor the amount of lubricating oil in the oil pan 1, a manually readable oil level gauge is installed on the door cover of the oil pan 1 to indicate the oil level. The oil level gauge is also marked with lines to warn of high and low fluid levels. In addition, a low fluid level sensor 3 is also installed in the oil pan 1. Once the fluid level falls below a certain height, an alarm signal will be issued to prompt the oil pan to be filled with oil.

[0003] To ensure the diesel engine maintains a suitable lubricating oil level—that is, the lubricating oil level in the oil pan 1 must be within a reasonable range—the lubricating oil level must be manually checked frequently using a dipstick. If the level is too low, the low-level sensor 3 will issue a low-level alarm signal through the level monitoring system. This method of lubricating oil level monitoring has significant drawbacks: firstly, manual monitoring is inconvenient, especially during ship navigation; secondly, if the low-level sensor 3 malfunctions, the alarm system will fail, and an excessively low lubricating oil level will prevent the diesel engine from operating normally, posing a risk of damage to the marine diesel engine. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for automatically balancing the amount of lubricating oil in the oil pan of a marine diesel engine. This method ensures that the oil level in the oil pan is in an automatic dynamic balance state, maintaining a stable amount of lubricating oil in the oil pan. This guarantees the lubricating oil requirement of the marine diesel engine during operation, ensures the normal operation of the marine diesel engine, and achieves the effects of simple structure, convenient operation, safety and reliability, and risk avoidance.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A method for automatically balancing the lubricating oil level in the oil pan of a marine diesel engine includes the following specific steps: 1) The oil suction pipe and the oil replenishment pipe are fixedly installed at the bottom inside the oil pan. One end of the oil suction pipe is connected to the oil suction pipe interface on the oil pan, and the other end of the pipe is open and vertically upward. The opening of the oil suction pipe is at a predetermined height from the bottom of the oil pan. One end of the oil replenishment pipe is connected to the oil replenishment pipe interface on the oil pan, and the other end of the pipe is open and close to the bottom inside the oil pan. 2) Install a balance oil tank on the outside of the marine diesel engine to store the lubricating oil required to balance the oil level in the oil pan. Connect the balance oil tank to the oil pan suction pipe interface through an oil suction pump and connect the oil pan replenishment pipe interface through a replenishment pump. The displacement of the replenishment pump is smaller than that of the oil suction pump. 3) Inject lubricating oil into the balance oil tank and oil pan; 4) When the marine diesel engine is running, the suction pump and the replenishing pump are started and operate continuously. The replenishing pump delivers lubricating oil from the balance tank to the oil pan through the replenishing pipe. When the lubricating oil level in the oil pan exceeds the height of the suction pipe opening, the suction pump draws the lubricating oil above the suction pipe opening back from the oil pan to the balance tank through the suction pipe. Since the displacement of the replenishing pump is less than that of the suction pump, the lubricating oil level in the oil pan is always maintained at the height of the suction pipe opening and cannot exceed the height of the suction pipe opening, thereby achieving a stable and automatic balance of the lubricating oil in the oil pan to ensure the lubricating oil requirements for the normal operation of the marine diesel engine.

[0006] Furthermore, the predetermined height of the oil suction pipe opening from the bottom of the oil pan is determined according to the amount of lubricating oil required for normal operation of the marine diesel engine.

[0007] Furthermore, the distance between the oil suction pipe opening and the upper surface of the oil pan is 30%-50% of the height of the oil suction pipe opening from the bottom of the oil pan.

[0008] Furthermore, the displacement of the suction pump is 10%-20% larger than that of the replenishment pump.

[0009] Furthermore, the balance tank is equipped with a liquid level sensing sensor for high and low liquid level alarms.

[0010] Furthermore, the balance tank is equipped with a transparent level indicator so that the level of the lubricating oil in the balance tank can be visually observed.

[0011] Compared with the prior art, the present invention achieves the following beneficial effects: This invention solves the problem of inconvenient manual monitoring of lubricating oil levels in marine diesel engines, which requires frequent checks. It employs a method that sets the suction pipe inlet at a predetermined height from the bottom of the oil pan and continuously operates a small-displacement make-up pump and a large-displacement suction pump. This ensures that the lubricating oil level in the oil pan neither overflows from a high level nor triggers a low-level alarm during operation. Regardless of whether the marine diesel engine is tilted or swaying with the ship, the lubricating oil level remains at a constant height, preventing the lubricating oil in the oil pan from being emptied. This achieves a dynamically constant lubricating oil level in the oil pan, ensuring a stable and automatic balance of lubricating oil and guaranteeing the normal operation of the marine diesel engine. Furthermore, this invention eliminates reliance on electronic components such as level sensors, reducing the risk of system failure.

[0012] In summary, the present invention has the advantages of simple structure, convenient operation, automatic operation, and safety and reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the oil pan of a marine diesel engine.

[0014] Figure 2 This is a schematic diagram of the structure of the present invention.

[0015] Figure 3 This is a flowchart of the method of the present invention.

[0016] Figure 4 This is a schematic diagram of the installation of the oil extraction pipe and the oil replenishment pipe in the oil pan.

[0017] In the diagram, 1—oil pan, 2—oil suction pipe, 3—low level sensor, 4—oil suction pipe, 5—oil replenishment pipe, 6—oil suction pipe interface, 7—oil suction pipe inlet, 8—oil replenishment pipe interface, 9—balance tank, 10—oil suction pump, 11—oil replenishment pump, 12—liquid level sensing sensor, 13—liquid level indicator. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following embodiments are not intended to limit the scope of the present invention. All equivalent substitutions and modifications made based on the content of this specification should fall within the scope of protection claimed by the present invention.

[0019] This invention is used for balancing and adjusting the amount of lubricating oil in the oil pan of marine diesel engines.

[0020] Please refer to the following: Figure 2 and Figure 3 The method for automatically balancing the lubricating oil level in the oil pan of a marine diesel engine includes the following specific steps: 1) The oil suction pipe 4 and the oil replenishment pipe 5 are fixedly installed at the bottom inside the oil pan 1, see Figure 4 The fuel filler pipe 5 and the fuel suction pipe 4 can be arranged at the free end of the diesel engine; one end of the fuel suction pipe 4 is connected to the fuel suction pipe interface 6 on the oil pan 1, and the other end, the pipe opening 7, is open and vertically upward. The fuel suction pipe opening 7 is at a predetermined height H from the bottom of the oil pan 1, see... Figure 2 The predetermined height H is determined based on the amount of lubricating oil required for normal operation of the marine diesel engine and the structure of the oil pan 1. The greater the amount of lubricating oil required by the marine diesel engine, the higher the predetermined height H is, and the more lubricating oil can be stored. In order to ensure that the lubricating oil does not overflow the oil pan 1, sufficient space needs to be left above the oil suction pipe opening 7. Usually, the distance h between the oil suction pipe opening 7 and the upper surface of the oil pan 1 is 30%-50% of the height H of the oil suction pipe opening 7 from the bottom of the oil pan 1. One end of the oil replenishment pipe 5 is connected to the oil replenishment pipe interface 8 on the oil pan 1, and the other end of the pipe is open and close to the bottom of the oil pan 1. To ensure that the oil suction pipe 4 and the oil supply pipe 5 can withstand both low and high temperature environments of lubricating oil, and to ensure reliable connection during use, the connection between the pipes adopts a sleeve structure. Please refer to [link / reference needed]. Figure 4 Furthermore, the fittings are securely fixed to the inside of the oil pan 1 using specialized pipe clamps.

[0021] 2) A balance oil tank 9 is installed outside the marine diesel engine to store lubricating oil to balance the oil level in the oil pan 1. The balance oil tank 9 is connected to the oil suction pipe interface 6 of the oil pan 1 through the oil suction pump 10, and simultaneously connected to the oil replenishment pipe interface 8 of the oil pan 1 through the oil replenishment pump 11. The displacement of the oil replenishment pump 11 must be less than that of the oil suction pump 10, and generally the displacement of the oil suction pump 10 is 10%-20% larger than that of the oil replenishment pump 11. The balance oil tank 9 is equipped with a liquid level sensing sensor 12. When the liquid level in the balance oil tank 9 is high or low, the liquid level sensing sensor 12 can give an alarm for high or low liquid level. The balance oil tank 9 is also equipped with a transparent liquid level indicator 13 so that the liquid level of the lubricating oil in the balance oil tank 9 can be seen visually at any time.

[0022] 3) Inject lubricating oil into the balance oil tank 9 and the oil pan 1.

[0023] 4) When the marine diesel engine is running, the suction pump 10 and the replenishment pump 11 are started simultaneously and kept running continuously. The replenishment pump 11 delivers lubricating oil from the balance tank 9 to the oil pan 1 through the replenishment pipe 5. When the level of lubricating oil in the oil pan 1 exceeds the height of the inlet 7 of the suction pipe 4, the suction pump 10 draws the lubricating oil above the inlet 7 from the oil pan 1 back to the balance tank 9 through the suction pipe 4. Since the displacement of the replenishment pump 11 is less than that of the suction pump 10, the level of lubricating oil in the oil pan 1 is always maintained at the height of the inlet 7 of the suction pipe, regardless of whether the diesel engine is in a rocking or stable state. This ensures that the level of lubricating oil in the oil pan 1 is kept at the same level as the inlet 7 of the suction pipe and cannot exceed the height of the inlet 7 of the suction pipe. This achieves a stable and automatic balance of lubricating oil in the oil pan 1, ensuring the normal operation of the marine diesel engine and meeting its lubricating oil requirements.

[0024] Experimental verification shows that the method described in this invention solves the problem of the need to frequently check the oil level in marine diesel engines, which is inconvenient to operate. It ensures that the oil level in the oil pan can be automatically kept in a balanced state when the diesel engine is sailing in wind and waves, and avoids the phenomenon of air suction when the engine-mounted lubricating oil pump draws oil from the oil pan, which would affect the lubricating oil requirements of the diesel engine during operation.

[0025] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. All equivalent changes and modifications made in accordance with the content of the present invention should be within the technical scope of the present invention.

Claims

1. A method for automatically balancing the amount of lubricating oil in the oil pan of a marine diesel engine, characterized in that: The adjustment method includes the following specific steps: 1) The oil suction pipe and the oil replenishment pipe are fixedly installed at the bottom inside the oil pan. One end of the oil suction pipe is connected to the oil suction pipe interface on the oil pan, and the other end of the pipe is open and vertically upward. The opening of the oil suction pipe is at a predetermined height from the bottom of the oil pan. One end of the oil replenishment pipe is connected to the oil replenishment pipe interface on the oil pan, and the other end of the pipe is open and close to the bottom inside the oil pan. 2) Install a balance oil tank on the outside of the marine diesel engine to store the lubricating oil required to balance the oil level in the oil pan. Connect the balance oil tank to the oil pan suction pipe interface through an oil suction pump and connect the oil pan replenishment pipe interface through a replenishment pump. The displacement of the replenishment pump is smaller than that of the oil suction pump. 3) Inject lubricating oil into the balance tank and oil pan; 4) When the marine diesel engine is running, the suction pump and the replenishing pump are started and operate continuously. The replenishing pump delivers lubricating oil from the balance tank to the oil pan through the replenishing pipe. When the lubricating oil level in the oil pan exceeds the height of the suction pipe opening, the suction pump draws the lubricating oil above the suction pipe opening back from the oil pan to the balance tank through the suction pipe. Since the displacement of the replenishing pump is less than that of the suction pump, the lubricating oil level in the oil pan is always maintained at the height of the suction pipe opening and cannot exceed the height of the suction pipe opening, thereby achieving a stable and automatic balance of the lubricating oil in the oil pan to ensure the lubricating oil requirements for normal operation of the marine diesel engine.

2. The method for automatically balancing the amount of lubricating oil in the oil pan of a marine diesel engine according to claim 1, characterized in that: The predetermined height of the oil suction pipe inlet from the bottom of the oil pan is determined according to the amount of lubricating oil required for normal operation of the marine diesel engine.

3. The method for automatically balancing the amount of lubricating oil in the oil pan of a marine diesel engine according to claim 2, characterized in that: The distance between the oil suction pipe opening and the upper surface of the oil pan is 30%-50% of the height of the oil suction pipe opening from the bottom of the oil pan.

4. The method for automatically balancing the amount of lubricating oil in the oil pan of a marine diesel engine according to claim 1, characterized in that: The displacement of the suction pump is 10%-20% larger than that of the replenishment pump.

5. The method for automatically balancing the amount of lubricating oil in the oil pan of a marine diesel engine according to claim 1, characterized in that: The balance tank is equipped with a liquid level sensing sensor for high and low liquid level alarms.

6. The method for automatically balancing the amount of lubricating oil in the oil pan of a marine diesel engine according to claim 1, characterized in that: The balance tank is equipped with a transparent level indicator so that the level of the lubricating oil in the tank can be visually observed.

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