Marine diesel engine

Abstract

The invention discloses a marine diesel engine, which belongs to the technical field of diesel engines and comprises a diesel engine body, a sea water pump is arranged at an auxiliary power port above a crankcase of the diesel engine body, and the sea water pump is communicated with an intercooler and a water radiator above the sea water pump through a cooling pipe. The intercooler and the water radiator are symmetrically arranged on the left side and the right side of the diesel engine body, and a waterway system in the diesel engine body flows through the water radiator. A flat oil pan is arranged at the bottom of the diesel engine body, air inlet systems are symmetrically arranged on the front side and the rear side of the side, provided with the intercooler, of the diesel engine body, and each air inlet system communicates with an air inlet pipe of the diesel engine body through the intercooler. The whole set of cooling system is redesigned according to the marine environment, so that the temperature of the cooling liquid in the waterway system in the diesel engine body is stabilized in a proper range, and reliable work of the diesel engine is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engines, and particularly relates to a marine diesel engine. Background Art

[0002] The new HC12V132CR land-based diesel engine developed by our company, such as Figure 1 and Figure 2 , meets the design requirements of modern diesel engines for lightweight and high power density, and can be widely used in market fields such as construction machinery, generator sets, and special vehicles. In order to expand the application fields of the company's products, expand the company's product line, and provide economic support for the company, a marine diesel engine is developed by expanding on the basis of the HC12V132CR land-based diesel engine. Summary of the Invention

[0003] In order to solve the problem that the existing land-based diesel engines cannot be applied to ships. The present invention provides a marine diesel engine that can be applied to ships after certain improvements to the existing land-based diesel engines.

[0004] The technical solution adopted by the marine diesel engine of the present invention is as follows:

[0005] A marine diesel engine includes a diesel engine body. A seawater pump is provided at the auxiliary power port above the crankcase of the diesel engine body. The seawater pump is connected to an intercooler and a water radiator located above the seawater pump through a cooling pipe. The intercooler and the water radiator are symmetrically arranged on the left and right sides of the diesel engine body, and the water circuit system inside the diesel engine body flows through the water radiator.

[0006] A flat oil sump is provided at the bottom of the diesel engine body, and intake systems are symmetrically arranged on the front and back sides of the side of the diesel engine body where the intercooler is provided. Each intake system is connected to the intake pipe of the diesel engine body through the intercooler.

[0007] A further improvement of the technical solution of the present invention is that there are two auxiliary power ports provided at the auxiliary power port of the diesel engine body. At the same time, two seawater pumps are provided corresponding to the two auxiliary power ports one by one, and each seawater pump is driven by a gear inside the auxiliary power port of the diesel engine body.

[0008] A further improvement of the above technical solution of the present invention is that one seawater pump is directly connected to the water inlet of the intercooler, and the other seawater pump is connected to the water inlet of the water radiator through a cooling pipe. The water outlet of the water radiator is connected to a water outlet pipe; at the same time, the water outlet of the intercooler is connected to the cooling pipe.

[0009] A further improvement of the technical solution of the present invention is that an expansion tank communicating with the water circuit system inside the diesel engine body is provided on one side of the water radiator.

[0010] A further improvement of the technical solution of the present invention lies in that: the height of the flat oil pan is 200 mm - 250 mm, and the oil filling amount in the flat oil pan is 75 L - 100 L.

[0011] A further improvement of the technical solution of the present invention lies in that: each intake system includes an air filter located on the front side or the rear side of the side of the diesel engine body where the intercooler is provided. The air filter is connected to the supercharger through an intake connection pipe. The outlet of the supercharger is connected to the inlet of the intercooler, and the outlet of the intercooler is connected to the intake pipe of the diesel engine body.

[0012] A further improvement of the technical solution of the present invention lies in that: the oil filter of the diesel engine body adopts an external structure, and the oil filter is installed vertically downward.

[0013] A further improvement of the technical solution of the present invention lies in that: the high-pressure oil pipeline of the diesel engine body is a double-layer fuel injection pipe, and the diesel engine body is provided with a fuel overflow leakage collection pipe.

[0014] A further improvement of the technical solution of the present invention lies in that: the surface of the exhaust pipe of the diesel engine body is coated with a soft layer of heat insulation, and an exhaust pipe shield is provided outside the soft layer of heat insulation.

[0015] Due to the adoption of the above technical solutions, the technical progress achieved by the present invention includes:

[0016] The present invention uses the diesel engine auxiliary power output port to integrally install a seawater pump, which is driven to rotate by an internal gear, and there is no need to separately set a power source for driving the seawater pump, simplifying the structure. The seawater pumped by the seawater pump enters the intercooler and the water radiator respectively. The seawater entering the intercooler can cool the air entering the intake system, and the seawater entering the water radiator can cool the coolant in the water circuit system inside the diesel engine body, so that the temperature of the coolant in the water circuit system inside the diesel engine body is stabilized within a suitable range, ensuring the reliable operation of the diesel engine of the present invention.

[0017] The present invention adopts a flat oil pan, which can effectively reduce the center of gravity height of the whole machine, thus saving the space occupied during installation. At the same time, since the oil filling amount in the flat oil pan is 75 L - 100 L, the oil maintenance filling cycle of the whole diesel engine can be extended to 50 h.

[0018] When the intake system of the present invention intakes air, after the supercharger pressurizes the fresh air, both the temperature and pressure will rise significantly. After the air temperature rises, it will affect the oxygen content in the intake air. The intercooler can cool the air with the increased temperature, thereby increasing the amount of air entering the combustion chamber, increasing the combustion air density and the intake air flow rate.

[0019] The expansion tank in the present invention is responsible for filling the coolant into the water system inside the whole diesel engine, timely supplementing and discharging part of the coolant according to the operation of the internal cooling circulation system of the diesel engine, and ensuring that the water inlet of the diesel engine cooling water pump maintains a positive pressure state and an internal pure liquid state.

[0020] In the present invention, since the oil filter adopts an external structure, which meets the requirements of the maintenance surface and cleaning environment in the cabin, the oil filter is installed downward, facilitating the operation of replacing the oil filter from the upper part of the diesel engine and avoiding the oil dripping and polluting the cabin environment during maintenance.

[0021] In the present invention, through the arranged fuel overflow leakage collection pipe, the leaked diesel can be collected when the diesel pipeline leaks, thus avoiding the oil splashing on the high-temperature components and causing ignition, and ensuring the safety of the personnel and property in the cabin.

[0022] In the present invention, through the arranged soft layer heat insulation and exhaust pipe shield, the exhaust pipe can be protected in all directions, enabling the outer surface temperature of the whole diesel engine of the present invention to meet the requirement of the marine engine specification ≤ 220 °C, and at the same time preventing the overall outer surface temperature of the diesel engine from being too high and scalding the operators in the closed space of the cabin. Brief Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of a land-based diesel engine in the background technology of a marine diesel engine of the present invention;

[0024] Figure 2 is a schematic structural diagram of a land-based diesel engine from another angle in the background technology of a marine diesel engine of the present invention;

[0025] Figure 3 is a schematic structural diagram of a marine diesel engine of the present invention;

[0026] Figure 4 is a schematic structural diagram of a marine diesel engine from another angle of the present invention;

[0027] Figure 5 is a schematic structural diagram of a flat-type flat oil sump of a marine diesel engine of the present invention;

[0028] Figure 6 is a schematic structural diagram of a high-pressure fuel injection pipe of a marine diesel engine of the present invention.

[0029] In the drawings: 1. Diesel engine body; 2. Seawater pump; 3. Intercooler; 4. Water radiator; 5. Cooling pipe; 6. Flat-type flat oil sump;

[0030] 7. Intake system; 71. Air filter; 72. Intake connection pipe; 73. Turbocharger;

[0031] 8. Expansion tank; 9. Oil filter; 10. Exhaust pipe shield; 11. High-pressure fuel injection pipe; 12. Fuel overflow leakage collection pipe. Detailed implementation manner

[0032] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the specific implementation manners and with reference to the accompanying drawings. In the following description, the description of well-known structures and technologies is omitted to avoid unnecessarily confusing the concepts of the present invention.

[0033] First, referring to Figure 3 and Figure 4 it can be seen that the present invention includes a diesel engine body 1, and the cylinder block, cylinder head, crankcase and internal structure of the diesel engine body 1 adopt those of the HC12V132CR marine diesel engine. There are two auxiliary power ports on the diesel engine body 1, namely port A and port B. A seawater pump 2 is provided at each port. Preferably, in the present invention, the seawater pump 2 can adopt a positive displacement pump commonly used in the prior art. At the same time, each seawater pump 2 is driven to rotate by a transmission gear inside the diesel engine body 1. Specifically, a transmission gear is installed in the auxiliary power port of the original HC12V132CR marine diesel engine. The pump shaft of the seawater pump 2 extends into the auxiliary power port and meshes with the transmission gear. When the whole diesel engine of the present invention operates, it will drive the transmission gear to rotate, and the rotating transmission gear can drive the pump shaft of the seawater pump 2 to rotate, so that the seawater pump 2 works. This arrangement makes the seawater pump 2 in the present invention do not require an additional drive source, which can reduce costs and simplify the structure while; on the left and right sides of the top of the diesel engine body 1, a water radiator 4 and an intercooler 3 are symmetrically arranged. Preferably, the water radiator 4 can be a plate-type radiator made of titanium plate material commonly used in the prior art. To facilitate the installation of the water radiator 4, a bracket can be fixedly installed (such as by bolts or welding, etc.) on the crankcase of the diesel engine body 1, and the water radiator 4 is fixed on one side of the diesel engine body 1 through the bracket. The intercooler 3 can be a tube-fin water-air intercooler 3 commonly used in the prior art; the intercooler 3 and the seawater pump 2 are located on the same side of the diesel engine body 1, and the intercooler 3 is located above the seawater pump 2. Specifically, the water outlet of one of the seawater pumps 2 is fixedly communicated with a cooling pipe 5. The cooling pipe 5 is arranged along the length direction of the diesel engine body 1 on one side of the top of the diesel engine body 1 and is communicated with the water inlet of the water radiator 4. The water outlet of the water radiator 4 is fixedly communicated with an outlet pipe; the water outlet of the other seawater pump 2 is directly communicated with the water inlet of the intercooler 3, and the water outlet of the intercooler 3 is communicated with the cooling pipe 5. For example, the seawater pump 2 located at port A is communicated with the water radiator 4 through the cooling pipe 5, and the seawater pump 2 located at port B is communicated with the intercooler 3. When the seawater pump 2 works, the seawater pump 2 located at port B pumps seawater directly into the intercooler 3, and the seawater flowing out of the intercooler 3 enters the cooling pipe 5 and converges with the seawater pumped by the seawater pump 2 located at port A and then enters the water radiator 4, and the seawater is discharged from the outlet pipe.

[0034] Inside the diesel engine body 1 of the present invention, a waterway system is also provided. This waterway system follows the internal cooling system of the original land-based diesel engine, and the waterway system inside the diesel engine body 1 flows through the water radiator 4. When the diesel engine of the present invention operates, the coolant in the waterway system inside the diesel engine body 1 cools down the diesel engine. At this time, the temperature of the coolant rises. When the coolant flows through the water radiator 4, it cools down through heat exchange, so that the temperature of the coolant is stabilized within a suitable range, ensuring the reliable operation of the diesel engine. In the present invention, an expansion tank 8 connected to the waterway system inside the diesel engine body 1 is also provided on one side of the water radiator 4. This expansion tank 8 is responsible for filling the coolant into the waterway system inside the diesel engine body 1, and timely replenishing and discharging part of the coolant according to the operation of the internal cooling circulation system of the diesel engine, ensuring that the inlet of the diesel engine cooling water pump maintains a positive pressure state and an internal pure liquid state.

[0035] The lubrication system inside the diesel engine of the present invention adopts an internal oil passage structure. There are three main lubrication methods, namely splash, pressure and compound lubrication. At the same time, in the present invention, the oil pan adopts a wet oil pan lubrication structure. To reduce the center of gravity height of the whole machine of the present invention, the oil pan adopts a flat oil pan 6. Specifically, the height of this flat oil pan 6 is between 200 mm and 250 mm, and the oil filling amount is 75 L - 100 L, so as to extend the oil maintenance filling cycle of the diesel engine of the present invention to 50 h.

[0036] The oil filter 9 of the diesel engine of the present invention adopts an external structure. In order to meet the requirements of the maintenance surface and cleaning environment in the cabin, the oil filter 9 is installed vertically downward, so as to facilitate the operation of replacing the oil filter 9 from the upper part of the diesel engine and avoid the oil dripping and polluting the cabin environment during maintenance.

[0037] The high-pressure oil pipeline 11 of the diesel engine of the present invention adopts a double-layer injection pipe, and at the same time, a fuel overflow leakage collection pipe 12 is designed and installed. When the diesel pipeline leaks, the fuel overflow leakage collection pipe 12 can collect the leaked diesel, avoiding the oil splashing on high-temperature components and causing ignition, thus ensuring the safety of personnel and property in the cabin. At the same time, a fuel leakage alarm can also be connected to the end of the fuel overflow leakage collection pipe, so that when the leaked fuel enters the fuel overflow leakage collection pipe, the fuel leakage alarm triggers the alarm function.

[0038] On both the front and rear sides of one side of the diesel engine of the present invention where the intercooler 3 is provided, intake systems 7 are symmetrically arranged. Each intake system 7 includes an air filter 71 located on the front or rear side of the diesel engine body 1. The air filter 71 is a metal mesh structure, thus meeting the requirements for the intake air flow rate and intake air cleanliness during the normal operation of the diesel engine. The air filter 71 is connected to a supercharger 73 through an intake connection pipe 72. The outlet of the supercharger 73 is connected to the intake port of the intercooler 3, and the outlet of the intercooler 3 is connected to the intake pipe of the diesel engine body 1. When the diesel engine of the present invention operates, external fresh air enters the diesel engine body 1 through the intake system 7. After the supercharger 73 pressurizes the fresh air, both the temperature and pressure of the air will rise significantly. The increase in temperature will affect the oxygen content in the intake air. After the heated air enters the intercooler 3, it is cooled through heat exchange, thereby increasing the amount of air entering the combustion chamber of the diesel engine body 1 and enhancing the combustion air density and intake air flow rate.

[0039] In the present invention, the seawater pump 2, the intercooler 3, the water radiator 4, and the waterway system inside the diesel engine body 1 together constitute the entire cooling system of the diesel engine of the present invention.

[0040] At the same time, the surface of the exhaust pipe of the diesel engine body 1 in the present invention is coated with a soft layer of heat insulation, and an exhaust pipe shield 10 is provided outside the soft layer of heat insulation. Through the provided soft layer of heat insulation and the exhaust pipe shield 10, the exhaust pipe can be protected in all directions, enabling the outer surface temperature of the entire diesel engine of the present invention to meet the requirement of the marine engine specification ≤ 220 °C. At the same time, it can prevent the overall outer surface temperature of the diesel engine from being too high and scalding the operators in the enclosed space of the cabin.

[0041] The working principle of the marine diesel engine in this embodiment is as follows: When the diesel engine of the present invention is in use, double-layer fuel injection pipes inject diesel into the combustion chamber. The intake system 7 pumps external air into the intercooler 3. After the air is cooled in the intercooler 3, it also enters the combustion chamber, thereby supplying oxygen for diesel combustion and starting the diesel engine of the present invention.

[0042] After the diesel engine of the present invention starts, it drives the seawater pump 2 to start. The seawater pump 2 pumps external seawater into the intercooler 3 and the water radiator 4. The seawater in the intercooler 3 can cool the air pumped by the intake system 7, and the seawater in the water radiator 4 can cool the coolant in the waterway system inside the diesel engine body 1, thereby ensuring the reliable operation of the diesel engine.

[0043] In the above embodiments, the present invention provides a marine diesel engine. The present invention uses the auxiliary power output port of the diesel engine to integrally install a seawater pump and drives the rotation with an internal gear, eliminating the need to separately set a power source for driving the seawater pump and simplifying the structure. The seawater pumped by the seawater pump enters the intercooler and the water radiator respectively. The seawater entering the intercooler can cool the air entering the intake system, and the seawater entering the water radiator can cool the coolant in the water circuit system inside the diesel engine body, so as to keep the temperature of the coolant in the water circuit system inside the diesel engine body stable within a suitable range and ensure the reliable operation of the diesel engine of the present invention.

[0044] The above-described embodiments are only used to describe the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A marine diesel engine, comprising a diesel engine body (1), characterized in that: An auxiliary power port above the crankcase of the diesel engine body (1) is provided with a seawater pump (2). The seawater pump (2) is connected to an intercooler (3) and a water radiator (4) located above the seawater pump (2) through a cooling pipe (5). The intercooler (3) and the water radiator (4) are symmetrically arranged on the left and right sides of the diesel engine body (1), and the water circuit system inside the diesel engine body (1) flows through the water radiator (4). The bottom of the diesel engine body (1) is provided with a flat-type flat oil pan (6), and intake systems (7) are symmetrically arranged on the front and rear sides of the side of the diesel engine body (1) where the intercooler (3) is provided. Each intake system (7) is connected to the intake pipe of the diesel engine body (1) through the intercooler (3).

2. The marine diesel engine according to claim 1, characterized in that: There are two auxiliary power ports provided on the diesel engine body (1). At the same time, two seawater pumps (2) are provided corresponding to the two auxiliary power ports one by one, and each seawater pump (2) is driven by a gear inside the auxiliary power port of the diesel engine body (1).

3. A marine diesel engine according to claim 2, characterized in that: One seawater pump (2) is directly connected to the water inlet of the intercooler (3), and the other seawater pump (2) is connected to the water inlet of the water radiator (4) through a cooling pipe (5). The water outlet of the water radiator (4) is connected to an outlet pipe. At the same time, the water outlet of the intercooler (3) is connected to the cooling pipe (5).

4. A marine diesel engine according to claim 1, characterized in that: An expansion tank (8) connected to the water circuit system inside the diesel engine body (1) is provided on one side of the water radiator (4).

5. A marine diesel engine according to claim 1, characterized in that: The height of the flat-type flat oil pan (6) is 200 mm - 250 mm, and the oil filling amount in the flat-type flat oil pan (6) is 75 L - 100 L.

6. A marine diesel engine according to claim 1, characterized in that: Each intake system (7) includes an air filter (71) located on the front or rear side of the side of the diesel engine body (1) where the intercooler (3) is provided. The air filter (71) is connected to a supercharger (73) through an intake connection pipe (72). The air outlet of the supercharger (73) is connected to the air inlet of the intercooler (3), and the air outlet of the intercooler (3) is connected to the intake pipe of the diesel engine body (1).

7. A marine diesel engine according to any one of claims 1-6, characterized in that: The oil filter (9) of the diesel engine body (1) adopts an external structure and is installed vertically downward.

8. A marine diesel engine according to any one of claims 1-6, characterized in that: The high-pressure oil pipeline of the diesel engine body (1) is a double-layer injection pipe (11), and the diesel engine body (1) is provided with a fuel overflow leakage collection pipe (12).

9. A marine diesel engine according to any one of claims 1-6, characterized in that: The surface of the exhaust pipe of the diesel engine body (1) is coated with a soft layer of heat insulation, and an exhaust pipe shield (10) is provided outside the soft layer of heat insulation.

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