Ship

Abstract

The present invention provides a ship comprising: a main engine; the first oil way is communicated with the main machine; the second oil way is communicated with the first oil way; the gravity oil tank is communicated with the main machine through a second oil way, the gravity oil tank is located above the main machine, and lubricating oil is stored in the gravity oil tank; the first check valve is arranged on the second oil way and located between the gravity oil tank and the main machine. The first switch valve is arranged on the second oil way and located between the gravity oil tank and the first check valve, and the third oil way is communicated with the gravity oil tank; the standby oil tank is communicated with the gravity oil tank through a third oil way, located below the gravity oil tank and used for conveying lubricating oil to the gravity oil tank, when the main machine is in the first working state, the gravity oil tank is in the oil supply state, and when the main machine is in the second working state, the gravity oil tank is in the oil storage state. By arranging the gravity oil tank, abnormal accidents after the lubricating oil system loses effectiveness can be effectively dealt with, and meanwhile occupation of ship resources is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of ships, and in particular relates to a ship. Background Art

[0002] The lubricating oil pump is used to lubricate the main mechanical equipment of the ship, such as the main engine. When the lubricating oil pump is working normally, the power comes from the main generator. When an emergency such as a power outage occurs, the lubricating oil pump loses power and cannot operate, and the main engine needs to be shut down urgently to ensure the safety of the unit. The unit shutdown process can last for 30 minutes. At this time, it is necessary to continuously maintain the supply of external oil source to ensure the heat dissipation during the shutdown process and prevent accidents such as bearing burning.

[0003] Therefore, the lubricating oil system needs to be equipped with an emergency oil source to provide emergency lubricating oil for the main engine and other equipment. The emergency oil supply must not only ensure the timely supply of lubricating oil under emergency conditions, but also must ensure a certain oil supply time for lubricating oil under emergency conditions. If the oil is cut off, it will cause accidents such as bearing burning, affecting the normal navigation of the ship. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] The present invention provides a ship comprising: a main engine; a first oil circuit connected to the main engine; a second oil circuit connected to the first oil circuit; a gravity oil tank connected to the main engine through the second oil circuit, and the gravity oil tank is located above the main engine; a first check valve is arranged on the second oil circuit and is located between the gravity oil tank and the main engine; a first switch valve is arranged on the second oil circuit and is located between the gravity oil tank and the first check valve, and a third oil circuit is connected to the gravity oil tank; a spare oil tank is connected to the gravity oil tank through the third oil circuit and is located below the gravity oil tank, and the spare oil tank is used to transport lubricating oil to the gravity oil tank; wherein, when the main engine is in the first working state, the gravity oil tank is in the oil supply state, and when the main engine is in the second working state, the gravity oil tank is in the oil storage state.

[0006] The ship provided by the present invention comprises a first oil circuit of a main engine, a second oil circuit, a gravity oil tank, a first check valve and a first switch valve. The main engine is the main mechanical equipment of the ship, and usually needs to be provided with lubricating oil for lubrication, cooling and cleaning. The first oil circuit is connected to the main engine to provide an oil pipeline for the main engine. One end of the second oil circuit is connected to the first oil circuit, and the other end is connected to the gravity oil tank. When the first oil circuit cannot provide lubricating oil to the main engine, the gravity oil tank supplies oil to the main engine via the second oil circuit and the first oil circuit. Spare lubricating oil is stored in the gravity oil tank. The gravity oil tank is located above the main engine, that is, the position of the gravity oil tank is higher than that of the main engine, so that the lubricating oil in the gravity oil tank is driven by gravity into the main engine for lubrication during emergency shutdown.

[0007] The first check valve and the first switch valve are arranged in sequence on the second oil circuit between the main engine and the gravity oil tank. The first switch valve is opened when the gravity oil tank needs to supply oil, and is closed when the gravity oil tank does not need to supply oil, so as to prevent the loss of lubricating oil in the gravity oil tank. The first check valve is arranged on the first oil circuit close to the main engine, and the first check valve is used to prevent the lubricating oil in the gravity oil tank from flowing to the main engine.

[0008] The third oil circuit is connected with the gravity oil tank, and the spare oil tank is connected with the gravity oil tank through the third oil circuit and is located below the gravity oil tank. The third oil circuit is connected with the gravity oil tank and the spare oil tank, and the gravity oil tank is replenished with the lubricating oil stored in the spare oil tank. The spare oil tank is located below the gravity oil tank, which is relatively easier to replenish the lubricating oil. At the same time, it is equivalent to increasing the capacity of the gravity oil tank, which can achieve a better oil supply effect.

[0009] Among them, when the main engine is in the first working state, the gravity oil tank is in the oil supply state, and when the main engine is in the second working state, the gravity oil tank is in the oil storage state. The first working state is the state when the main engine is in an emergency shutdown situation. At this time, the lubricating oil is transported to the main engine through the gravity oil tank to provide the main engine with reliable emergency lubricating oil to prevent accidents from affecting the navigation of the ship. The second working state is the operating state of the main engine under normal circumstances. The gravity oil tank is in the oil storage state. As a spare oil tank, the volume of the spare oil tank can be reduced, thereby reducing the occupation of ship resources, occupying less space, and lowering the investment cost.

[0010] The solution provided by the present invention provides a gravity oil tank to achieve non-passive emergency oil supply. The gravity oil tank only requires a second oil circuit, a first switch valve and a first check valve, and can perform the oil supply function without external input. It is a non-passive oil supply. When the main engine inlet pressure is low, the lubricating oil in the gravity oil tank is driven by gravity to lubricate the main engine and other important equipment.

[0011] In addition, the gravity oil tank is a spare oil tank, which stores spare lubricating oil under normal conditions, reducing the volume of the spare oil tank. Therefore, the total volume and total weight of the oil tanks of the entire ship remain unchanged, and the space requirement is not increased. Furthermore, the gravity oil tank is a structure on the hull, which stores spare lubricating oil under normal conditions, reducing the volume of the spare oil tank. Therefore, there is no need to purchase additional equipment, and the investment cost is low.

[0012] The above-mentioned ship provided by the present invention may also have the following additional technical features:

[0013] In the above technical solution, further, the second switch valve is arranged in the third oil circuit and is located between the gravity oil tank and the spare oil tank.

[0014] In this technical solution, the second switch valve is arranged in the third oil circuit, specifically between the gravity oil tank and the spare oil tank. It is used to prevent the lubricating oil in the gravity oil tank from leaking downward into the spare oil tank due to gravity. When the gravity oil tank needs to be drained, the second switch valve can be opened, thereby realizing the leakage and replacement of the lubricating oil in the gravity oil tank. By maintaining a certain amount of lubricating oil in the gravity oil tank, it can effectively deal with abnormal accidents when the main engine is shut down.

[0015] In the above technical solution, further, a second check valve is provided on the third oil circuit and is located between the gravity oil tank and the spare oil tank.

[0016] In this technical solution, the second check valve is arranged on the third oil circuit, specifically between the gravity oil tank and the spare oil tank, to limit the oil in the gravity oil tank from leaking to the spare oil tank below due to gravity. When oil needs to be supplied upward, it can also be opened automatically to replenish the oil in the spare oil tank to the gravity oil tank. Maintaining a certain amount of oil in the gravity oil tank can effectively deal with abnormal accidents when the main engine is shut down.

[0017] In the above technical solution, further, the hull and the main engine are arranged inside the hull; in the height direction of the ship, the distance between the gravity oil tank and the bottom of the hull is a first height value, and the distance between the lubricating oil inlet of the main engine and the bottom of the hull is a second height value, and the first height value is greater than the second height value.

[0018] In this technical solution, the ship also includes a hull, and the main engine is arranged in the hull. In the height direction of the ship, the first height value represents the distance between the gravity oil tank and the bottom of the hull. Specifically, the first height value represents the distance between the bottom of the gravity oil tank and the bottom of the hull, and the second height value represents the distance between the lubricating oil inlet of the main engine and the bottom of the hull, wherein the first height value is greater than the second height value. By reasonably setting the position of the gravity oil tank to be higher than the position of the lubricating oil inlet of the main engine, the lubricating oil in the gravity oil tank can enter the main engine after being driven by gravity, and is used for lubrication under emergency shutdown. At the same time, the structure of the ship can also be made more reasonable.

[0019] In the above technical solution, further, the circulating oil tank is connected to the first oil circuit and the main engine.

[0020] In this technical solution, the circulating oil tank is connected to the first oil circuit and the main engine. Under normal circumstances, when oil is supplied to the main engine, the lubricating oil flowing out of the main engine flows into the circulating oil tank through the first oil circuit, thereby realizing the storage and recycling of the lubricating oil and effectively improving the utilization rate of the lubricating oil.

[0021] In the above technical solution, further, a first lubricating oil pump is connected to the first oil circuit and is used to pump external lubricating oil to the main engine.

[0022] In this technical solution, the first lubricating oil pump can supply external lubricating oil to the main engine by being connected to the first oil circuit, thereby realizing a continuous supply of lubricating oil to the main engine under normal circumstances and meeting the lubrication needs of the main engine.

[0023] In the above technical solution, further, the gravity oil tank transports lubricating oil to the spare oil tank through the third oil circuit.

[0024] In this technical solution, the gravity oil tank can drain oil into the spare oil tank under the action of gravity. It is not only simple to operate but also independent of power equipment, thus reducing equipment costs.

[0025] In the above technical solution, further, the second lubricating oil pump is connected to the third oil circuit and is located between the second check valve and the spare oil tank.

[0026] In this technical solution, the second lubricating oil pump is connected to the third oil circuit, specifically located between the second check valve and the spare oil tank, and is used to supply the lubricating oil stored in the spare oil tank to the gravity oil tank above, that is, to replenish the lubricating oil in the spare oil tank to the gravity oil tank. Maintaining a certain amount of lubricating oil in the gravity oil tank can effectively deal with abnormal accidents when the main engine is shut down.

[0027] In the above technical solution, further, a gravity oil tank is arranged on the hull.

[0028] In this technical solution, the gravity oil tank is arranged on the hull, that is, as a structure on the hull, it stores spare lubricating oil under normal conditions, reducing the volume of the spare oil tank. Therefore, there is no need to purchase additional equipment and the investment cost is low.

[0029] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention.

[0030] The beneficial effects brought by the present invention are as follows:

[0031] It can be seen from the above scheme that the ship provided by the present invention can effectively ensure the cooling and lubrication of the main engine in the case of emergency shutdown by providing a reliable emergency oil source with a gravity oil tank, and prevent the occurrence of bearing burning accidents that affect the navigation of the ship. The gravity oil tank can also be used as a spare oil tank to store spare lubricating oil under normal conditions, reducing the volume of the spare oil tank, reducing the volume of the spare oil tank, and no need to purchase additional equipment, with a low investment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 One of the structural schematic diagrams of a ship provided by an embodiment of the present invention is shown.

[0033] Figure 2 The second schematic diagram shows the structure of a ship provided by an embodiment of the present invention.

[0034] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and component names in the figure is:

[0035] 100 ship, 110 main engine, 120 first oil circuit, 130 second oil circuit, 140 gravity oil tank, 150 first check valve, 160 first switch valve, 170 circulating oil tank, 180 first lubricating oil pump, 190 third oil circuit, 1010 spare oil tank, 1020 second switch valve, 1030 second check valve, 1040 second lubricating oil pump, 1050 hull. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Refer to the following Figure 1 and Figure 2 A vessel according to some embodiments of the invention is described.

[0038] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a ship 100 including: a main engine 110; a first oil circuit 120, which is connected to the main engine 110; a second oil circuit 130, which is connected to the first oil circuit 120; a gravity oil tank 140, which is connected to the main engine 110 through the second oil circuit 130, and the gravity oil tank 140 is located above the main engine 110; a first check valve 150, which is arranged on the second oil circuit 130 and is located between the gravity oil tank 140 and the main engine 110; a first switch valve 160, which is arranged on the second oil circuit 130 and is located between the gravity oil tank 140 and the first check valve 150, and a third oil circuit is connected to the gravity oil tank; a spare oil tank, which is connected to the gravity oil tank through the third oil circuit and is located below the gravity oil tank, and the spare oil tank is used to transport lubricating oil to the gravity oil tank; wherein, when the main engine is in the first working state, the gravity oil tank is in the oil supply state, and when the main engine is in the second working state, the gravity oil tank is in the oil storage state.

[0039] The ship 100 provided by the present invention comprises a first oil circuit 120 of a main engine 110, a second oil circuit 130, a gravity oil tank 140, a first check valve 150 and a first switch valve 160. The main engine 110 is a main mechanical equipment of the ship, and usually needs to be provided with lubricating oil for lubrication, cooling and cleaning. The first oil circuit 120 is connected with the main engine 110 to provide an oil pipeline for the main engine 110. One end of the second oil circuit 130 is connected with the first oil circuit 120, and the other end is connected with the gravity oil tank 140. When the first oil circuit 120 cannot provide lubricating oil for the main engine 110, the gravity oil tank 140 supplies oil to the main engine 110 via the second oil circuit 130 and the first oil circuit 120. Spare lubricating oil is stored in the gravity oil tank 140, which is located above the main engine 110, that is, the position of the gravity oil tank 140 is higher than the position of the main engine 110, so that the lubricating oil in the gravity oil tank 140 is driven by gravity into the main engine 110 for lubrication during emergency shutdown.

[0040] The first check valve 150 and the first switch valve 160 are sequentially arranged on the second oil circuit 130 between the main engine 110 and the gravity oil tank 140. The first switch valve 160 is opened when the gravity oil tank 140 is required to supply oil, and is closed when the gravity oil tank 140 is not required to supply oil, so as to prevent the loss of lubricating oil in the gravity oil tank 140. The first check valve 150 is arranged on the first oil circuit 120 close to the main engine 110, and the first check valve 150 is used to prevent the lubricating oil in the gravity oil tank 140 from flowing to the main engine 110.

[0041] The third oil circuit 190 is connected with the gravity oil tank 140, and the spare oil tank 1010 is connected with the gravity oil tank through the third oil circuit and is located below the gravity oil tank. The third oil circuit is connected with the gravity oil tank and the spare oil tank, and the gravity oil tank is replenished with the lubricating oil stored in the spare oil tank. The spare oil tank is located below the gravity oil tank, which is relatively easier to replenish the lubricating oil. At the same time, it is equivalent to increasing the capacity of the gravity oil tank, which can achieve a better oil supply effect.

[0042] Among them, when the main engine is in the first working state, the gravity oil tank is in the oil supply state, and when the main engine is in the second working state, the gravity oil tank is in the oil storage state. The first working state is the state when the main engine is in an emergency shutdown situation. At this time, the lubricating oil is transported to the main engine through the gravity oil tank to provide the main engine with reliable emergency lubricating oil to prevent accidents from affecting the navigation of the ship. The second working state is the operating state of the main engine under normal circumstances. The gravity oil tank is in the oil storage state. As a spare oil tank, the volume of the spare oil tank can be reduced, thereby reducing the occupation of ship resources, occupying less space, and lowering the investment cost.

[0043] In the related technology, the lubricating oil system provides lubricating oil for the main mechanical equipment of the ship, such as the main engine, to lubricate, cool and clean it. The lubricating oil system is generally equipped with multiple lubricating oil pumps to improve the reliability of the lubricating oil system. When the lubricating oil pump works normally, the power comes from the main generator. In an emergency such as a power outage of the entire ship, the lubricating oil pump loses power and cannot operate, and the main engine needs to be shut down urgently to ensure the safety of the unit. The unit shutdown process can last for 30 minutes. At this time, it is necessary to continuously maintain the supply of external oil source to ensure the heat dissipation during the shutdown process and prevent accidents such as bearing burning.

[0044] The solution provided by the present invention is used for emergency lubricating oil supply for large equipment such as main engines in emergency situations such as power outages on large ships. Therefore, a gravity oil tank 140 is provided to realize passive emergency oil supply. The gravity oil tank 140 only needs the second oil circuit 130, the first switch valve 160 and the first check valve 150, and can perform the oil supply function without external input. When the inlet pressure of the main engine 110 is low, the lubricating oil in the gravity oil tank 140 is driven by gravity to lubricate important equipment such as the main engine 110. At the same time, the gravity oil tank 140 is a spare oil tank, which stores spare lubricating oil under normal conditions, reducing the volume of the spare oil tank 1010. Therefore, the total volume and total weight of the oil tanks of the entire ship remain unchanged, and the space requirement is not increased. Therefore, there is no need to purchase additional equipment, and the investment cost is low.

[0045] In the above embodiment, further, Figure 1 As shown, the second switch valve 1020 is disposed in the third oil circuit 190 and is located between the gravity oil tank 140 and the spare oil tank 1010 .

[0046] In this embodiment, the second switch valve 1020 is disposed in the third oil circuit 190, specifically between the gravity oil tank 140 and the spare oil tank 1010. It is used to prevent the lubricating oil in the gravity oil tank 140 from leaking downward into the spare oil tank 1010 due to gravity. When the gravity oil tank 140 needs to be drained, the second switch valve 1020 can be opened, thereby realizing the leakage and replacement of the lubricating oil in the gravity oil tank 140. By maintaining a certain amount of lubricating oil in the gravity oil tank 140, it is possible to effectively deal with abnormal accidents when the main engine 110 is shut down.

[0047] In the above embodiment, further, Figure 1 As shown, the second check valve 1030 is disposed on the third oil circuit 190 and is located between the gravity oil tank 140 and the spare oil tank 1010 .

[0048] In this embodiment, the second check valve 1030 is provided on the third oil passage 190, specifically between the gravity oil tank 140 and the spare oil tank 1010, and is used to limit the lubricating oil in the gravity oil tank 140 from leaking to the spare oil tank 1010 below due to gravity. When oil needs to be supplied upward, the second check valve 1030 can also be automatically opened to replenish the lubricating oil in the spare oil tank 1010 to the gravity oil tank 140. By maintaining a certain amount of lubricating oil in the gravity oil tank 140, abnormal accidents when the main engine 110 is shut down can be effectively dealt with.

[0049] In the above embodiment, further, Figure 2 As shown, the hull 1050, the main engine is arranged inside the hull; in the height direction of the ship, the distance between the gravity oil tank and the bottom of the hull is a first height value, the distance between the lubricating oil inlet of the main engine and the bottom of the hull is a second height value, and the first height value is greater than the second height value.

[0050] In this embodiment, the ship further includes a hull 1050, and the main engine is arranged in the hull. In the height direction of the ship, the first height value represents the distance between the gravity oil tank 140 and the bottom of the hull. Specifically, the first height value represents the distance between the bottom of the gravity oil tank 140 and the bottom of the hull, and the second height value represents the distance between the lubricating oil inlet of the main engine 110 and the bottom of the hull, wherein the first height value is greater than the second height value. By reasonably setting the position of the gravity oil tank 140 to be higher than the position of the lubricating oil inlet of the main engine, the lubricating oil in the gravity oil tank 140 can enter the main engine 110 after being driven by gravity, and is used for lubrication under emergency shutdown. At the same time, the structure of the ship can also be made more reasonable.

[0051] like Figure 2 As shown, H1 represents the height of the bottom of the gravity oil tank 140 from the bottom of the hull, that is, the first height value. H2 represents the height of the bottom of the gravity oil tank 140 from the lubricating oil inlet of the main engine 110, that is, the second height value.

[0052] In the above embodiment, if Figure 2 As shown, further, the circulating oil tank 170 is connected to the first oil circuit 120 and the main engine 110.

[0053] In this embodiment, the circulating oil tank 170 is connected to the first oil circuit 120 and the main engine 110. Under normal circumstances, when oil is supplied to the main engine 110, the lubricating oil flowing out of the main engine 110 flows into the circulating oil tank 170 through the first oil circuit 120, thereby realizing the storage and recycling of the lubricating oil and effectively improving the utilization rate of the lubricating oil.

[0054] In the above embodiment, further, Figure 2 As shown, the first lubricating oil pump 180 is connected to the first oil circuit 120 and is used to pump external lubricating oil to the main engine 110 .

[0055] In this embodiment, the first lubricating oil pump 180 can supply external lubricating oil to the main engine 110 by communicating with the first oil circuit 120 , thereby realizing a continuous supply of lubricating oil to the main engine 110 under normal circumstances and meeting the lubrication demand of the main engine 110 .

[0056] In the above embodiment, further, Figure 1 As shown, the gravity oil tank 140 delivers lubricating oil to the reserve oil tank 1010 through the third oil passage 190 .

[0057] In this embodiment, the gravity oil tank can drain oil into the spare oil tank under the action of gravity, which is not only simple to operate but also independent of power equipment, thus reducing equipment costs.

[0058] In the above embodiment, further, Figure 1 As shown, the second lubricating oil pump 1040 is connected to the third oil circuit 190 and is located between the second check valve 1030 and the reserve oil tank 1010 .

[0059] In this embodiment, the second lubricating oil pump 1040 is connected to the third oil passage 190, specifically located between the second check valve 1030 and the spare oil tank 1010, and is used to supply the lubricating oil stored in the spare oil tank 1010 to the gravity oil tank 140 above, that is, to replenish the lubricating oil in the spare oil tank 1010 to the gravity oil tank 140. By maintaining a certain amount of lubricating oil in the gravity oil tank 140, abnormal accidents when the main engine 110 is shut down can be effectively dealt with.

[0060] In the above embodiment, further, the gravity oil tank 140 is arranged on the hull.

[0061] In this embodiment, the gravity oil tank 140 is arranged on the hull, that is, as a structure on the hull, it stores spare lubricating oil under normal conditions, reducing the volume of the spare oil tank 1010. Therefore, there is no need to purchase additional equipment and the investment cost is low. Specific embodiment:

[0063] The gravity oil tank is set at a high position, and the height difference compared to the main engine lubricating oil inlet is h. The calculation formula for the gravity pressure head of the lubricating oil in the gravity oil tank is:

[0064] P1 = ρgh-P2-P3;

[0065] in:

[0066] P1: gravity pressure head in the gravity tank;

[0067] ρ: Lubricating oil density;

[0068] h: height difference between the bottom of the gravity oil tank and the lubricating oil inlet;

[0069] P2: the resistance along the pipeline from the gravity oil tank to the main engine inlet;

[0070] P3: The local resistance of the pipeline from the gravity oil tank to the main engine inlet is mainly composed of the resistance brought by the switch valve and the check valve.

[0071] The operation of the lubricating oil system in the ship (consisting of the main engine, the first oil circuit, the second oil circuit, the gravity oil tank, the first check valve, the first switch valve, the circulating oil tank, the first lubricating oil pump, the third oil circuit, the spare oil tank, the second switch valve, the second check valve, and the second lubricating oil pump) is as follows:

[0072] 1) Start-up situation

[0073] After the lubricating oil system is fully opened, the first switch valve on the second oil circuit of the gravity oil tank to the first oil circuit is opened, and the gravity oil tank is put into use.

[0074] 2) Downtime

[0075] Before the first lubricating oil pump of the lubricating oil system is shut down, the first switch valve on the second oil line to the first oil line of the gravity oil tank should be closed to prevent the loss of lubricating oil in the gravity oil tank. The gravity oil tank stores spare lubricating oil, which is connected to the spare oil tank through the third oil line and the second switch valve. The spare oil tank can replenish oil to the gravity oil tank through the second lubricating oil pump, and the gravity oil tank can also drain oil to the spare oil tank.

[0076] 3) Normal operation

[0077] Under normal circumstances, the first lubricating oil pump in the lubricating oil system supplies oil to the main engine. The lubricating oil supply pressure at the main engine inlet is P, and the gravity pressure head in the gravity oil tank is P1. At this time, P>P1, the lubricating oil supply pressure at the main engine inlet is greater than the gravity pressure head of the gravity oil tank, and the lubricating oil is blocked by the first check valve and will not enter the gravity oil tank.

[0078] 4) Abnormal situations

[0079] When the first lubricating oil pump in the lubricating oil system loses its effectiveness due to power failure or other reasons, the lubricating oil pressure P at the main engine inlet gradually decreases. When P<P1, the gravity pressure head of the gravity oil tank is large, the first check valve opens automatically, and the lubricating oil in the gravity oil tank is driven by gravity into the main engine for lubrication during emergency shutdown.

[0080] Height h from the bottom of the gravity oil tank to the main engine oil inlet m The calculation formula is as follows:

[0081] P z = ρgh m -P2-P3;

[0082] Among them, h m is the height of the bottom of the gravity tank from the main engine oil inlet, P2 is the resistance along the pipeline from the gravity tank to the main engine inlet, P3 is the local resistance of the pipeline from the gravity tank to the main engine inlet, Pz is the emergency lubricating oil pressure requirement during the main engine shutdown process, F z is the lubricating oil flow.

[0083] By using the above formula, h can be calculated m , which is the minimum height difference between the bottom of the gravity oil tank and the main engine lubricating oil inlet. The minimum height of the gravity oil tank can be determined according to the main engine layout.

[0084] Gravity fuel tank capacity G m The calculation formula is as follows:

[0085] G m =F z ×T;

[0086] Among them, G m is the volume of the gravity oil tank, T is the minimum time for emergency lubrication of the main engine, F z is the lubricating oil flow.

[0087] The specific algorithm is as follows: During the emergency shutdown of a ship's main engine, the lubricating oil flow rate requirement is 5m 3 / min (cubic meters / minute), the pressure requirement is 0.10MPa (megapascal, pressure unit), the lubricating oil inlet is 2 meters from the bottom of the hull, and the density of the lubricating oil is 0.87g / cm 3 .

[0088] The design is as follows:

[0089] A gravity oil tank is set up to lubricate the main engine. According to the pipeline layout, the resistance along the pipeline from the gravity oil tank to the main engine inlet is P2 = 0.001MPa, and the local resistance from the gravity oil tank to the main engine inlet is P3 = 0.005MPa.

[0090] The height h from the bottom of the gravity tank to the main engine oil inlet can be calculated. m = 11 meters. Therefore, the bottom of the gravity tank should be 13 meters from the bottom of the hull.

[0091] According to the lubrication requirements of the main engine, it should be no less than 5 minutes, and T can be 5 minutes.

[0092] Gravity fuel tank capacity G m =25m 3 Considering the air space inside the tank, the tank volume can be 30m 3 At the same time, the gravity tank is a spare tank, and the spare tank capacity can be reduced by 25m 3 .

[0093] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention.

[0094] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A ship (100), characterized in that: include: Host (110); A first oil circuit (120) connected to the main engine (110); A second oil circuit (130) connected to the first oil circuit (120); a gravity oil tank (140), which is in communication with the main engine (110) via the second oil passage (130); the gravity oil tank (140) is located above the main engine (110); and lubricating oil is stored in the gravity oil tank (140); A first check valve (150) is provided on the second oil circuit (130) and is located between the gravity oil tank (140) and the main engine (110); A first switch valve (160) is provided on the second oil circuit (130) and is located between the gravity oil tank (140) and the first check valve (150); A third oil circuit (190) connected to the gravity oil tank (140); a standby oil tank (1010), which is connected to the gravity oil tank (140) through the third oil passage (190) and is located below the gravity oil tank (140); the standby oil tank (1010) is used to transport the lubricating oil to the gravity oil tank (140); When the main engine (110) is in the first working state, the gravity oil tank (140) is in the oil supply state, and when the main engine (110) is in the second working state, the gravity oil tank (140) is in the oil storage state.

2. The ship (100) according to claim 1, characterized in that: Also includes: The second switch valve (1020) is arranged in the third oil circuit and is located between the gravity oil tank (140) and the standby oil tank (1010).

3. The vessel (100) according to claim 1, characterized in that: Also includes: The second check valve (1030) is provided on the third oil circuit and is located between the gravity oil tank (140) and the standby oil tank (1010).

4. The vessel (100) according to claim 1, characterized in that: Also includes: A hull (1050), wherein the main engine (110) is arranged in the hull (1050); 5. The ship (100) according to claim 4, characterized in that: Also includes: In the height direction of the ship, the distance between the gravity oil tank (140) and the bottom of the hull is a first height value, the distance between the lubricating oil inlet of the main engine (110) and the bottom of the hull (1050) is a second height value, and the first height value is greater than the second height value.

6. The vessel (100) according to claim 1, characterized in that: Also includes: A circulating oil tank (170) is connected to the first oil circuit (120) and the main engine (110).

7. The vessel (100) according to claim 1, characterized in that: Also includes: A first lubricating oil pump (180) is connected to the first oil passage (120) and is used to pump external lubricating oil to the main engine (110).

8. The vessel (100) according to claim 1, characterized in that: Also includes: The gravity oil tank (140) delivers lubricating oil to the reserve oil tank (1010) through the third oil passage (190).

9. The vessel (100) according to claim 3, characterized in that: Also includes: The second lubricating oil pump (1040) is connected to the third oil circuit and is located between the second check valve and the reserve oil tank (1010).

10. The ship (100) according to claim 4 or 5, characterized in that: Also includes: The gravity oil tank (140) is arranged on the hull (1050).

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