A marine fresh water heat exchange double circulation water-cooled single-cylinder marine generator set

Abstract

The utility model provides a kind of sea fresh water heat exchange's double circulation water cooling single cylinder marine generator set, it is related to marine generator set technical field, and this generator set includes engine, generator, pedestal, cooling liquid internal circulation cooling system and sea water external circulation cooling system;Sea water external circulation cooling system contains and is directly connected with the external circulation seawater pump of engine gear box, cooling liquid internal circulation cooling system includes three-way pipe parallel water path and high position exhaust structure, three-way pipe parallel water path includes three-way pipe, heat exchanger, cooling water tank and electric water pump, the water inlet of electric water pump is connected with heat exchanger and cooling water tank respectively by three-way pipe, and the water outlet of electric water pump is connected with engine water inlet;The utility model is improved by sea fresh water internal sea water external circulation cooling system and advanced water pump driving mode, improves the effect of generator set operating efficiency and reliability.

Description

Technical Field

[0001] This utility model relates to the technical field of marine generator sets, specifically to a dual-cycle water-cooled single-cylinder marine generator set with seawater and freshwater heat exchange. Background Technology

[0002] In existing marine generator set cooling systems, the generator set consists of several parts, including a diesel engine, generator, base, cooling system, and control system. The external circulation seawater pump typically uses a belt drive, which suffers from poor transmission smoothness, low efficiency, and high maintenance difficulty. Especially under high loads, this affects heat dissipation and can even lead to generator failure, severely reducing the reliability of the unit. Traditional cooling water circuits are usually enclosed spaces, making it difficult to completely expel air from the water passages during coolant addition, leading to air lock and causing engine overheating failures. Furthermore, the existing cooling systems use inefficient external circulation seawater pumps, and the lack of consideration for air removal from the engine's water passages increases the risk of system failure.

[0003] Therefore, there is an urgent need for an improved generator cooling system that can improve cooling efficiency, reduce maintenance difficulty, and enhance system reliability. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a dual-cycle water-cooled single-cylinder marine generator set with seawater and freshwater heat exchange. It aims to solve the shortcomings of the prior art by improving the seawater and freshwater internal and seawater external circulation cooling system and the advanced water pump drive method, so as to improve the operating efficiency and reliability of the generator set.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] Based on the above objectives, this utility model provides a dual-cycle water-cooled single-cylinder marine generator set with seawater and freshwater heat exchange, including an engine, a generator, a base, an internal coolant circulation cooling system, and an external seawater circulation cooling system. The external seawater circulation cooling system includes an external seawater pump directly connected to the engine gearbox. The internal coolant circulation cooling system includes a three-way parallel water circuit and a high-level exhaust structure. The three-way parallel water circuit includes a three-way pipe, a heat exchanger, a cooling water tank, and an electric water pump. The inlet of the electric water pump is connected to the heat exchanger and the cooling water tank via the three-way pipe, and the outlet of the electric water pump is connected to the engine inlet. The high-level exhaust structure includes an air exhaust pipe laid along the highest point of the entire unit, with both ends of the air exhaust pipe connected to the engine outlet pipe and the cooling water tank overflow pipe, respectively.

[0007] Furthermore, the internal coolant circulation cooling system and the external seawater circulation cooling system exchange heat through a heat exchanger. The internal coolant circulation cooling system is used for engine cooling, and the external seawater circulation cooling system is used for heat exchange with the internal coolant circulation cooling system.

[0008] Furthermore, the inlet of the electric water pump is connected to both the heat exchanger outlet and the bottom of the cooling water tank via a T-connector.

[0009] Furthermore, the heat exchanger is detachably mounted on a common base below the unit, the cooling water tank is detachably fixed above the unit frame, and the electric water pump is located between the heat exchanger and the cooling water tank.

[0010] Furthermore, the air exhaust pipe is laid at a height higher than the highest operating water level of the engine and heat exchanger.

[0011] Furthermore, the external seawater circulation cooling system includes an inlet pipe, an outlet pipe, and a heat exchanger. The external seawater pump is connected to the engine gearbox via a direct-drive structure with a rigid shaft, without a belt or gear reduction device. The speed of the external seawater pump can vary with the engine speed.

[0012] Furthermore, the inlet pipe and outlet pipe of the seawater external circulation cooling system, as well as the tee pipe of the coolant internal circulation cooling system, are all made of high-temperature resistant (150℃) silicone rubber or fluororubber material.

[0013] Furthermore, the seawater external circulation cooling system supports the circulation of a mixed cooling medium of seawater and freshwater to enhance the cooling effect.

[0014] Furthermore, the connection pipe between the three-way pipe and the inlet of the electric water pump has a Y-shaped diversion structure, which allows the coolant in the heat exchanger and the cooling water tank to be replenished in both directions.

[0015] Furthermore, the internal cooling system and the external seawater cooling system exchange heat through a heat exchanger. The internal cooling system is driven by an electric water pump to circulate the coolant, while the external seawater cooling system is driven by a gear-driven water pump to flow the cooling water.

[0016] Furthermore, the air exhaust pipe can automatically expel air from the water passage when the generator set starts, preventing air lock from forming and causing engine overheating failure. The driving methods of the electric water pump and the external circulation seawater pump can both ensure efficient and stable cooling effects and reduce the difficulty of system maintenance.

[0017] The cooling method adopted by this utility model of a dual-cycle water-cooled single-cylinder marine generator set with seawater and freshwater heat exchange is that the seawater pump is directly connected to the diesel engine and operates synchronously with the diesel engine. When the diesel engine is running, the high-temperature exhaust gas from the exhaust pipe mixes with the seawater through the water-vapor mixing bend, which reduces the exhaust temperature. At the same time, the exhaust pressure is used to discharge the seawater and exhaust gas together through the muffler and exhaust pipe to the outside of the ship. This avoids the risk of excessive seawater flooding the muffler and then backflowing into the generator cylinder when other types of water pumps are not synchronized with the exhaust.

[0018] In addition, the water pump of the coolant internal circulation system is an electric pump, which is driven by the generator set. The internal circulation system is not related to the exhaust system, so it does not need to be highly synchronized with the unit. It only needs to run for a long time after the unit is started, and there is no risk of backflow.

[0019] The above two water pump designs of this utility model avoid external moving parts such as belt drives, which greatly improves the reliability of generator operation.

[0020] Compared with existing technologies, the dual-cycle water-cooled single-cylinder marine generator set with seawater-freshwater heat exchange proposed in this utility model has the following advantages:

[0021] 1. This utility model employs a dual-water cooling design using both fresh and seawater, combined with an internal freshwater and external seawater circulation cooling system. Through a heat exchanger, it achieves highly efficient heat exchange, significantly improving the thermal efficiency of the cooling system. The internal coolant circulation system is driven by an electric water pump for efficient water flow, ensuring stable engine temperature control. The external seawater circulation cooling system, driven by a gear-driven water pump, efficiently handles the cooling needs of both seawater and freshwater, effectively preventing coolant overheating and thus extending the generator set's service life.

[0022] 2. The design of this utility model greatly improves the reliability of the generator set. The internal and external circulation systems exchange heat through independent cooling circuits, avoiding the system's over-reliance on a single cooling circuit and reducing the risk of single-point failure. Simultaneously, the internal coolant circulation system is equipped with an exhaust pipe, which can promptly expel air from the water channels, preventing air lock and thus ensuring stable system operation and preventing engine failures caused by overheating or air lock.

[0023] 3. This utility model uses an engine gear to drive an external circulating seawater pump, which has higher transmission efficiency and stability compared to the traditional belt drive method. The pump speed is automatically adjusted according to the engine speed, ensuring that the cooling water flow rate matches the engine load, reducing energy loss in the traditional belt drive method, and improving the overall efficiency of the system.

[0024] 4. The cooling system design of this utility model takes into account the need for convenient maintenance. The drive methods of the electric water pump and the external circulating seawater pump have a long service life, reducing the wear and tear problems of traditional belt-driven systems. By optimizing the design of the water pump and using high-temperature resistant materials for the connecting pipes, the entire cooling system is made more durable, reducing the frequency and difficulty of daily maintenance and greatly saving maintenance costs.

[0025] 5. The air exhaust pipe design of this invention ensures effective air removal from the system during startup, preventing water pump failure or cooling system malfunction due to air blockage, thereby improving the safety and stability of the generator set. The system can operate for extended periods under high load and high temperature conditions, ensuring the normal operation of the generator set. By optimizing the cooling system and water pump drive method, this invention reduces unnecessary energy consumption, improves the energy efficiency of the cooling system, and meets the requirements of energy conservation and environmental protection. Simultaneously, the adoption of a mixed seawater and freshwater cooling mode reduces the use of either seawater or freshwater alone, saving resources and achieving more efficient water resource utilization.

[0026] 6. This utility model adopts an innovative design of dual water cooling using both fresh and seawater, making the cooling method more diversified. It can flexibly adjust the use of cooling water source according to different environmental conditions, adapt to the needs of different working environments, thereby improving the adaptability and flexibility of the cooling system, and is widely applicable to various types of marine generator sets.

[0027] In summary, in this utility model of a dual-cycle water-cooled single-cylinder marine generator set with seawater-freshwater heat exchange, the external circulation seawater pump is driven by engine gears, resulting in efficient and reliable drive, smooth transmission, long maintenance cycle, and convenient repair, effectively improving system reliability. The air exhaust pipe automatically discharges air from the water passages after the machine starts, preventing air lock and related engine overheating failures.

[0028] These or other aspects of this application will become more apparent from the following description of embodiments. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the application. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the accompanying drawings used in the description of the exemplary embodiments or related technologies will be briefly introduced below. The drawings are used to provide a further understanding of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain this utility model and do not constitute a limitation on this utility model. In the drawings:

[0030] Figure 1This is a schematic diagram of the structure of a dual-cycle water-cooled single-cylinder marine generator set with seawater and freshwater heat exchange according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram illustrating the cooling principle of a dual-cycle water-cooled single-cylinder marine generator set with seawater and freshwater heat exchange, according to an embodiment of this utility model.

[0032] Wherein: 1-Cooling water tank; 2-T-pipe; 3-Heat exchanger; 4-Electric water pump; 5-External circulation seawater pump; 6-Engine; 7-Engine outlet pipe; 8-Air exhaust pipe. Detailed Implementation

[0033] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model are further described in detail below with reference to specific examples and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit this application.

[0035] It should be noted that all uses of the terms "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two different entities or different parameters with the same name. Therefore, "first" and "second" are merely for convenience of expression and should not be construed as limiting the embodiments of this utility model. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as other steps or units inherent in a process, method, system, product, or device that includes a series of steps or units.

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0038] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] See Figure 1 and Figure 2 As shown, an embodiment of this utility model provides a dual-circulation water-cooled single-cylinder marine generator set with seawater and freshwater heat exchange. The generator set includes an engine 6, a generator, a base, an internal cooling system for coolant circulation, and an external cooling system for seawater circulation. The external cooling system for seawater circulation includes an external seawater pump 5 directly connected to the gearbox of the engine 6. The internal cooling system for coolant circulation includes a three-way pipe 2 in parallel water circuit and a high-level exhaust structure. The three-way pipe 2 in parallel water circuit includes a three-way pipe 2, a heat exchanger 3, a cooling water tank 1, and an electric water pump 4. The inlet of the electric water pump 4 is connected to the heat exchanger 3 and the cooling water tank 1 respectively through the three-way pipe 2, and the outlet of the electric water pump 4 is connected to the inlet of the engine 6. The high-level exhaust structure includes an air exhaust pipe 8 laid along the highest point of the entire machine. The two ends of the air exhaust pipe 8 are connected to the engine water outlet pipe 7 and the overflow pipe of the cooling water tank 1 respectively.

[0040] This invention employs a dual-water cooling design, combining seawater and freshwater internal circulation with an external seawater circulation cooling system. Through heat exchanger 3, it achieves highly efficient heat exchange, significantly improving the thermal efficiency of the cooling system. The internal coolant circulation system is driven by an electric water pump 4 for efficient water flow, ensuring stable temperature control of the engine 6. The external seawater circulation cooling system, driven by a gear-driven water pump, efficiently handles the cooling needs of both seawater and freshwater, effectively preventing coolant overheating and thus extending the generator set's service life. The engine 6 can be a diesel engine.

[0041] In this embodiment, the air exhaust pipe 8 is laid at a height higher than the highest working water level of the engine 6 and the heat exchanger 3.

[0042] The design of the air exhaust pipe 8 in this invention ensures effective air removal from the system during startup, preventing water pump failure or cooling system malfunction due to air blockage, thereby improving the safety and stability of the generator set. The system can operate for extended periods under high load and high temperature conditions, guaranteeing the normal operation of the generator set. By optimizing the cooling system and water pump drive method, this invention reduces unnecessary energy consumption, improves the energy efficiency of the cooling system, and meets the requirements of energy conservation and environmental protection. Simultaneously, the adoption of a mixed seawater and freshwater cooling mode reduces the use of either seawater or freshwater alone, saving resources and achieving more efficient water resource utilization.

[0043] In this embodiment, the internal coolant circulation cooling system and the external seawater circulation cooling system exchange heat through a heat exchanger 3. The internal coolant circulation cooling system is used to cool the engine 6, and the external seawater circulation cooling system is used to exchange heat with the internal coolant circulation cooling system. The inlet of the electric water pump 4 is connected to both the outlet of the heat exchanger 3 and the bottom of the cooling water tank 1 via a three-way pipe 2.

[0044] In this embodiment, the heat exchanger 3 is detachably installed on a common base below the unit, the cooling water tank 1 is detachably fixed above the unit frame, and the electric water pump 4 is located between the heat exchanger 3 and the cooling water tank 1.

[0045] In this embodiment, the seawater external circulation cooling system includes an inlet pipe, an outlet pipe, and a heat exchanger 3. The external circulation seawater pump 5 is directly connected to the engine 6 gearbox using a rigid shaft structure, without a belt or gear reduction device. The speed of the external circulation seawater pump 5 can vary with the speed of the engine 6. The inlet pipe, outlet pipe of the seawater external circulation cooling system, and the T-connector 2 of the coolant internal circulation cooling system are all made of silicone rubber or fluororubber material resistant to temperatures up to 150°C.

[0046] The cooling system design of this invention takes into account the need for convenient maintenance. The drive mechanism of the electric water pump 4 and the external circulating seawater pump 5 has a long service life, reducing the wear and tear problems associated with traditional belt-driven systems. By optimizing the pump design and using high-temperature resistant materials for the connecting pipes, the entire cooling system is made more durable, reducing the frequency and difficulty of daily maintenance and significantly saving maintenance costs.

[0047] This invention employs an engine 6 gear-driven external circulation seawater pump 5, which offers higher transmission efficiency and stability compared to traditional belt drives. The pump's speed automatically adjusts with the engine 6's rotational speed, ensuring the cooling water flow matches the engine 6's load, reducing energy loss in traditional belt drives, and improving the overall system efficiency.

[0048] The seawater external circulation cooling system supports the circulation of a mixed cooling medium of seawater and freshwater to enhance the cooling effect. This invention employs an innovative dual-water cooling design, combining seawater and freshwater, making the cooling method more diversified. The use of the external cooling water source can be flexibly adjusted according to different environmental conditions to meet the needs of different working environments. The external cooling water source uses either seawater or freshwater (river water), thereby improving the adaptability and flexibility of the cooling system and making it widely applicable to various types of marine generator sets.

[0049] In this embodiment, the connecting pipe between the three-way pipe 2 and the inlet of the electric water pump 4 has a Y-shaped diversion structure, which allows the coolant in the heat exchanger 3 and the cooling water tank 1 to be replenished in both directions.

[0050] In this embodiment, the internal coolant circulation cooling system and the external seawater circulation cooling system exchange heat through a heat exchanger 3. The internal coolant circulation cooling system is driven by an electric water pump 4 to circulate the coolant, while the external seawater circulation cooling system uses a gear-driven water pump to flow the cooling water. The air exhaust pipe 8 automatically removes air from the water passages when the generator set starts, preventing air lock from causing high-temperature failure of the engine 6. The driving methods of both the electric water pump 4 and the external seawater circulation pump 5 ensure efficient and stable cooling effects and reduce the difficulty of system maintenance.

[0051] This invention significantly improves the reliability of the generator set. The internal and external circulation systems exchange heat through independent cooling circuits, avoiding over-reliance on a single cooling circuit and reducing the risk of single-point failures. Simultaneously, the internal coolant circulation system is equipped with an exhaust pipe to promptly expel air from the water channels, preventing air lock and ensuring stable system operation. This prevents engine failures caused by overheating or air lock.

[0052] In summary, in this invention's dual-cycle water-cooled single-cylinder marine generator set with seawater-freshwater heat exchange, the external circulation seawater pump 5 is driven by the engine 6 gears, resulting in efficient and reliable drive, smooth transmission, long maintenance cycles, and convenient repair, effectively improving system reliability. The air exhaust pipe 8 automatically discharges air from the waterway after the machine starts, preventing air lock and associated high-temperature failure of the engine 6.

[0053] The above are exemplary embodiments disclosed in this utility model. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this utility model as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this utility model may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0054] It should be understood that, as used herein, the singular form "a" is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations of one or more of the associatedly listed items. The embodiment numbers disclosed above are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0055] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the framework of the present invention, technical features of the above embodiments or different embodiments can also be combined, and many other variations of different aspects of the present invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A marine fresh water heat exchange double cycle water-cooled single-cylinder marine generator set, characterized by, Includes engine (6), generator, base, internal coolant circulation cooling system and external seawater circulation cooling system; The external seawater circulation cooling system includes an external seawater pump (5) directly connected to the gearbox of the engine (6). The internal coolant circulation cooling system includes a three-way pipe (2) parallel water circuit and a high-level exhaust structure. The three-way pipe (2) parallel water circuit includes a three-way pipe (2), a heat exchanger (3), a cooling water tank (1), and an electric water pump (4). The inlet of the electric water pump (4) is connected to the heat exchanger (3) and the cooling water tank (1) respectively through the three-way pipe (2). The outlet of the electric water pump (4) is connected to the inlet of the engine (6). The high-level exhaust structure includes an air exhaust pipe (8) laid along the highest point of the machine. The two ends of the air exhaust pipe (8) are connected to the engine water outlet pipe (7) and the overflow pipe of the cooling water tank (1) respectively.

2. The marine fresh water heat exchange dual cycle water-cooled single cylinder engine generator set according to claim 1, characterized in that, The internal cooling system and the external cooling system exchange heat through a heat exchanger (3). The internal cooling system is used to cool the engine (6), and the external cooling system is used to exchange heat with the internal cooling system.

3. The marine fresh water heat exchange double cycle water-cooled single cylinder engine generator set according to claim 2, characterized in that, The inlet of the electric water pump (4) is connected to both the outlet of the heat exchanger (3) and the bottom of the cooling water tank (1) through a three-way pipe (2).

4. The marine fresh water heat exchange double cycle water-cooled single cylinder engine generator set according to claim 3, characterized in that, The heat exchanger (3) is detachably mounted on a common base below the unit, the cooling water tank (1) is detachably fixed above the unit frame, and the electric water pump (4) is located between the heat exchanger (3) and the cooling water tank (1).

5. The marine fresh water heat exchange dual cycle water-cooled single cylinder engine generator set as claimed in claim 1, wherein, The air exhaust pipe (8) is laid at a height higher than the highest working water level of the engine (6) and heat exchanger (3).

6. The marine fresh water heat exchange dual cycle water-cooled single cylinder engine generator set of claim 1, wherein, The external seawater circulation cooling system includes an inlet pipe, an outlet pipe, and a heat exchanger (3). The external seawater pump (5) and the engine (6) gearbox are connected by a hard shaft direct connection structure.

7. The marine fresh water heat exchange dual cycle water-cooled single cylinder engine generator set of claim 6, wherein, The inlet pipe and outlet pipe of the seawater external circulation cooling system and the tee pipe (2) of the coolant internal circulation cooling system are all made of silicone rubber or fluororubber.

8. The marine fresh water heat exchange double cycle water-cooled single cylinder engine generator set according to claim 7, characterized in that, The seawater external circulation cooling system supports the circulation of a mixed cooling medium of seawater and freshwater.

9. The marine fresh water heat exchange dual cycle water-cooled single cylinder engine generator set of claim 8, wherein, The connection between the three-way pipe (2) and the inlet of the electric water pump (4) is a Y-shaped diversion structure, which allows the coolant in the heat exchanger (3) and the cooling water tank (1) to be replenished in both directions.

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