A single cylinder diesel engine cycle heat sink

Abstract

The application discloses a circulating heat dissipation device for single-cylinder diesel engine and relates to the technical field of diesel engines. The device comprises a rack, a diesel engine flywheel and a diesel engine water tank, and a circulating water pump and an electronic fan radiator assembly are additionally arranged; the water tank, the circulating water pump and the electronic fan radiator assembly are connected through pipelines to form a closed-loop cooling circuit. The circulating water pump is fixed to the rack through a mechanical pump frame and is directly driven by the diesel engine flywheel through a belt, and no additional power source is needed. A special pipe joint is arranged at the water outlet of the water tank to connect the pipeline, and the electronic fan radiator assembly relies on the self-provided electronic fan to realize forced air cooling. The application changes the traditional natural heat dissipation mode, realizes forced circulation heat exchange of cooling water, significantly improves the heat dissipation efficiency, can effectively avoid the phenomenon of boiling of the diesel engine during high-load operation, has a simple overall structure, is suitable for modification and use of existing single-cylinder diesel engines, and has low modification cost, stable operation and excellent heat dissipation effect.

Description

Technical Field

[0001] This invention relates to the field of diesel engine technology, and more specifically to a circulating cooling device for a single-cylinder diesel engine. Background Technology

[0002] Single-cylinder diesel engines are widely used in agricultural machinery, small power generation equipment, and construction machinery due to their simple structure, low manufacturing cost, and convenient maintenance. During operation, fuel combustion in the cylinder generates a large amount of heat energy, part of which is converted into mechanical energy output, while the rest is conducted and radiated outwards through components such as the engine block and cylinder head. If this heat cannot be dissipated in time, the engine temperature will continue to rise, affecting not only the engine's power output but also accelerating the wear of parts. In severe cases, it can even cause the engine to overheat, rendering it unable to function properly.

[0003] Traditional single-cylinder diesel engines primarily rely on a water tank mounted on the engine for natural cooling. The tank stores a certain amount of coolant; heat generated during engine operation is conducted through the engine block to the coolant, which then dissipates the heat through natural convection and evaporation. While this cooling method is simple, its cooling capacity is significantly insufficient under prolonged high-load conditions (such as agricultural harrowing). As operating time increases, the water temperature in the tank rises continuously, eventually causing the coolant to boil over, forcing the engine to be shut down for cooling, severely impacting operational efficiency. Furthermore, in traditional cooling methods, the coolant in the tank flows slowly under natural circulation, resulting in low heat exchange efficiency, making it difficult to meet the cooling requirements of diesel engines under heavy loads.

[0004] Several improved solutions for the heat dissipation problem of single-cylinder diesel engines exist in the prior art. For example, Chinese utility model patent CN221277854U discloses a heat dissipation device for a single-cylinder diesel engine, which dissipates heat by setting heat dissipation fins and a cooling fan on one side of a metal plate, combined with a heat-spreading copper plate and copper pipe structure. This solution mainly adopts air cooling, accelerating heat dissipation through heat dissipation fins and a fan. However, this device relies primarily on air cooling, resulting in a limited heat exchange area between the cooling medium and the diesel engine block, leaving room for improvement in heat dissipation efficiency. Furthermore, its structure is relatively complex, making installation and maintenance inconvenient.

[0005] Furthermore, while some existing improvement solutions introduce components such as circulating water pumps or cooling fans, most require additional electrical power (e.g., relying on generators or batteries), increasing system complexity and energy consumption. In some solutions, the drive mechanism of the circulating water pump and the transmission connection between it and the diesel engine flywheel are not reliable enough, affecting the stability and durability of the cooling system.

[0006] Therefore, there is an urgent need in this field for a circulating cooling device that is simple in structure, requires no additional electric drive, has high heat dissipation efficiency, and can maintain a suitable operating temperature for a single-cylinder diesel engine under long-term high-load operation conditions. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned problems and provide a circulating cooling device for a single-cylinder diesel engine. To achieve the above objective, this invention adopts the following technical solution: A single-cylinder diesel engine circulating cooling device includes a frame on which a diesel engine flywheel and a diesel engine water tank are mounted. The device is characterized in that it further includes a circulating water pump and an electric fan radiator assembly. The diesel engine water tank, the circulating water pump, and the electric fan radiator assembly are connected in sequence through pipelines to form a closed-loop cooling circuit; The diesel engine flywheel is connected to the circulating water pump via a belt drive. The circulating water pump is fixedly installed on the frame via a mechanical pump bracket.

[0008] As an improvement, the diesel engine water tank is provided with a water tank outlet and a water tank return outlet, the circulating water pump is provided with a water pump inlet and a water pump outlet, the electric fan radiator assembly is provided with a radiator assembly inlet and a radiator assembly outlet, the water tank outlet is connected to the water pump inlet, the water pump outlet is connected to the radiator assembly inlet, and the radiator assembly outlet is connected to the water tank return outlet.

[0009] As an improvement, the diesel engine flywheel is provided with a pulley, and the circulating water pump is provided with a water pump pulley, and the belt is respectively connected to the pulley and the water pump pulley for transmission.

[0010] As an improvement, the mechanical pump frame is welded and fixed to the frame.

[0011] As an improvement, the electronic fan heat sink assembly includes a heat sink body and an electronic fan disposed on the side of the heat sink body.

[0012] As an improvement, a pipe connector is provided at the outlet of the water tank, which is used to connect the pipeline between the diesel engine water tank and the circulating water pump.

[0013] As an improvement, the pipe connector is a 90-degree air pipe connector, one end of which is connected to the water outlet of the water tank, and the other end is welded with an iron pipe.

[0014] As an improvement, the pipes of the closed-loop cooling circuit are water pipes.

[0015] The advantages of this invention are: 1. This invention boasts high heat dissipation efficiency, effectively preventing overheating. It employs a forced-circulation water cooling system, using a circulating water pump to force cooling water to flow between the diesel engine block and the radiator. This rapid water flow ensures thorough heat exchange; simultaneously, an electric fan provides forced air cooling to the radiator, significantly improving heat dissipation efficiency. Even under prolonged high-load operation (such as agricultural harrowing), the diesel engine can maintain a suitable operating temperature range, effectively preventing the cooling water from boiling over.

[0016] 2. This invention requires no additional power source, making it energy-efficient and highly effective. The circulating water pump of this invention is directly driven by the diesel engine flywheel via a belt, utilizing the rotational energy of the diesel engine itself to drive the water pump. It eliminates the need for an independent drive motor or reliance on an external power source, resulting in a simple structure, low energy consumption, and high reliability.

[0017] 3. This invention is easy to install and has low modification costs. It can be directly retrofitted to existing single-cylinder diesel engines. Simply remove the original drain valve and replace it with a specially designed pipe connector to introduce hot water from the engine block into the circulating water pump. The mechanical pump frame is welded and fixed to the engine frame, ensuring secure installation, convenient operation, and low modification costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a circulating cooling device for a single-cylinder diesel engine.

[0019] Figure 2 This is a structural diagram of a circulating cooling device for a single-cylinder diesel engine.

[0020] Figure 3 This is a bottom view of a circulating water pump.

[0021] Figure 4 This is a structural diagram of a mechanical pump frame.

[0022] The diagram is labeled as follows: 1. Rack; 2. Diesel engine flywheel; 21. Pulley; 3. Diesel engine water tank; 31. Water tank outlet; 32. Water tank return outlet; 4. Circulating water pump; 41. Pump pulley; 42. Pump inlet; 43. Pump outlet; 5. Electric fan radiator assembly; 51. Radiator body; 52. Electric fan; 53. Radiator assembly inlet; 54. Radiator assembly outlet; 6. Belt; 7. Mechanical pump frame; 8. Piping; 9. Battery. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] In the description of the embodiments of the present invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, "multiple" means at least two.

[0027] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0028] The present invention will now be described in detail and specifically through specific embodiments to enable a better understanding of the present invention. However, the following embodiments do not limit the scope of protection of the present invention. Technical solution

[0029] like Figures 1 to 4 As shown, a single-cylinder diesel engine circulating cooling device includes a frame 1, on which a diesel engine flywheel 2 and a diesel engine water tank 3 are mounted, and also includes a circulating water pump 4 and an electric fan radiator assembly 5.

[0030] like Figure 1 , Figure 2 As shown, the diesel engine water tank 3, the circulating water pump 4, and the electric fan radiator assembly 5 are connected sequentially through pipes 8 to form a closed-loop cooling circuit. Specifically, the diesel engine water tank 3 is provided with a water tank outlet 31 and a water tank return outlet 32, the circulating water pump 4 is provided with a water pump inlet 42 and a water pump outlet 43, and the electric fan radiator assembly 5 is provided with a radiator assembly inlet 53 and a radiator assembly outlet 54. The water tank outlet 31 is connected to the water pump inlet 42, the water pump outlet 43 is connected to the radiator assembly inlet 53, and the radiator assembly outlet 54 is connected to the water tank return outlet 32.

[0031] like Figure 2 , Figure 3 As shown, the diesel engine flywheel 2 and the circulating water pump 4 are connected by a belt 6. Specifically, the diesel engine flywheel 2 is equipped with a pulley 21, and the circulating water pump 4 is equipped with a water pump pulley 41. The belt 6 is engaged with both the pulley 21 and the water pump pulley 41 for transmission. When the diesel engine starts running, the flywheel 2 rotates, which drives the water pump pulley 41 of the circulating water pump 4 to rotate via the belt 6, thereby driving the circulating water pump 4 to work.

[0032] like Figure 4 As shown, the circulating water pump 4 is fixedly installed on the frame 1 via a mechanical pump bracket 7. The mechanical pump bracket 7 and the frame 1 can be fixedly connected by welding to ensure the stability and reliability of the circulating water pump 4 during operation.

[0033] The electric fan heat sink assembly 5 includes a heat sink body 51 and an electric fan 52 disposed on the side of the heat sink body 51. The heat sink body 51 is used to realize heat exchange between cooling water and air, and the electric fan 52 is used to force convection to accelerate the heat dissipation of the heat sink body 51 and improve heat dissipation efficiency. A battery 9 is also provided on the rack 1, which is electrically connected to the electric fan 52 to provide operating power for the electric fan 52. The electric fan 52 can be a DC electric fan, directly powered by the battery 9 on the rack 1.

[0034] Pipe 8 in the closed-loop cooling circuit is a water pipe, which can be made of rubber, metal or composite materials.

[0035] A pipe connector is provided at the outlet of the diesel engine water tank 3. The pipe connector is used to connect the pipeline 8 between the diesel engine water tank 3 and the circulating water pump 4. More preferably, the pipe connector is a 90-degree air pipe connector. One end of the 90-degree air pipe connector is connected to the outlet of the diesel engine water tank 3 (this outlet is the original location of the diesel engine drain switch; the original drain switch is removed during installation and replaced by this pipe connector). The other end is welded with an iron pipe, through which hot water from the diesel engine body is introduced into the circulating water pump 4. The outer diameter and thread pitch of the 90-degree air pipe connector are consistent with the original drain switch of the diesel engine for direct replacement installation.

[0036] The working principle of the single-cylinder diesel engine circulating cooling device of the present invention is as follows: like Figure 1 , Figure 2 As shown, after the diesel engine starts, the flywheel 2 begins to rotate, driving the circulating water pump 4 via the belt 6. The impeller of the circulating water pump 4 rotates at high speed inside the pump housing, generating suction force to draw hot water from the diesel engine's water tank 3 outlet (the original drain valve position) and send it into the circulating water pump 4 via the pipeline 8. The circulating water pump 4 pressurizes the hot water and delivers it to the electric fan radiator assembly 5. The hot water flows inside the radiator body 51, exchanging heat with the radiator body 51. The heat is conducted to the surface of the radiator body 51, and the electric fan 52 forces airflow across the surface of the radiator body 51, carrying away the heat and cooling the hot water into cold water. The cooled water flows out through the outlet of the radiator body 51 and returns to the diesel engine's water tank 3 via the return water pipeline 8, then re-enters the diesel engine to participate in the next cycle. This cycle repeats continuously, with cooling water flowing in a closed loop – cold water enters the diesel engine block, absorbs heat, and becomes hot water. The hot water is then sent to the radiator by the circulating water pump 4 for air cooling, becomes cold water again, and returns to the engine block – achieving continuous cooling of the diesel engine during operation and keeping it within a suitable operating temperature range. Example

[0037] This embodiment discloses a circulating cooling device for a single-cylinder diesel engine.

[0038] like Figures 1 to 4 As shown, this embodiment includes a frame 1, which is equipped with a diesel engine flywheel 2 and a diesel engine water tank 3. The diesel engine water tank 3 is arranged above the diesel engine body and is used to store cooling water and is connected to the water chamber inside the diesel engine body.

[0039] This device is equipped with a circulating water pump 4 and an electric fan radiator assembly 5. The circulating water pump 4 is used to drive the cooling water to circulate in a closed-loop pipeline, and the electric fan radiator assembly 5 is used to implement air cooling for the circulating cooling water.

[0040] The diesel engine water tank 3, circulating water pump 4, and electric fan radiator assembly 5 are sequentially connected via pipe 8 to form a closed-loop cooling circuit. The diesel engine water tank 3 has a water tank outlet 31 and a water tank return outlet 32. The circulating water pump 4 has a water pump inlet 42 and a water pump outlet 43. The electric fan radiator assembly 5 has a radiator assembly inlet 53 and a radiator assembly outlet 54. The water tank outlet 31 is connected to the water pump inlet 42, the water pump outlet 43 is connected to the radiator assembly inlet 53, and the radiator assembly outlet 54 is connected to the water tank return outlet 32. Cooling water circulates along the path: water tank 3 → circulating water pump 4 → electric fan radiator assembly 5 → water tank 3.

[0041] The diesel engine flywheel 2 and the circulating water pump 4 are driven by a belt 6. The diesel engine flywheel 2 is equipped with a pulley 21, and the circulating water pump 4 is equipped with a water pump pulley 41. The belt 6 is fitted with two pulleys to achieve power transmission. After the diesel engine starts, the flywheel 2 rotates synchronously, driving the water pump pulley 41 to rotate via the belt 6, which in turn drives the impeller inside the circulating water pump 4 to rotate. The circulating water pump 4 is a centrifugal water pump. The impeller rotates at high speed in the pump casing to generate centrifugal suction, drawing in cooling water from the inlet and pressurizing it to be delivered from the outlet.

[0042] like Figure 3 , Figure 4 As shown, the circulating water pump 4 is fixedly mounted on the frame 1 by the mechanical pump frame 7. The mechanical pump frame 7 is welded and fixed to the frame 1 to ensure stable operation of the water pump and avoid problems such as water pump displacement and transmission failure caused by vibration.

[0043] The electric fan radiator assembly 5 includes a radiator body 51 and an electric fan 52 located on the side of the radiator body 51. The radiator body 51 has internal cooling water flow channels, allowing the cooling water to exchange heat with the radiator body 51 as it flows. Heat dissipation fins are arranged on the outside of the radiator body 51 to increase the heat exchange area. The electric fan 52, located on one side of the radiator body 51, forces airflow to wash away heat from the radiator surface during operation, improving heat dissipation efficiency. A battery 9 is mounted on the frame 1, and the battery 9 is electrically connected to the electric fan 52 to power it. The electric fan 52 is a 12V or 24V DC fan, directly powered by the vehicle battery 9, requiring no additional power supply equipment.

[0044] The closed-loop cooling circuit uses rubber water pipes 8, which are suitable for bending wiring and have heat and pressure resistance. All joints of pipes 8 are sealed with pipe clamps and clips to prevent leakage.

[0045] A pipe fitting is installed at the outlet of the diesel engine water tank 3. The pipe fitting is used to connect the pipeline 8 between the water tank 3 and the circulating water pump 4. In this embodiment, the pipe fitting is a 90-degree air pipe fitting. One end of the fitting is connected to the water tank outlet 31, which is the original drain switch installation position of the diesel engine. The other end of the fitting is welded with a water guide iron pipe. During assembly, the original drain switch of the diesel engine is removed and the 90-degree air pipe fitting is directly replaced and installed. The outer diameter and thread pitch of the fitting are completely matched with the original drain switch. There is no need to make additional holes or cut the water tank. The high-temperature water inside the diesel engine body is discharged and transported to the circulating water pump 4 through the welded iron pipe.

[0046] The electric fan radiator assembly 5 uses commercially available standardized products, and the corresponding heat dissipation power is matched according to the rated power and total heat generation of the single-cylinder diesel engine; the flow rate and head of the circulating water pump 4 are adapted and selected according to the total volume of the diesel engine cooling water and the fluid resistance of the pipeline to ensure that the cooling water circulation flow rate and overall heat dissipation performance meet the standards.

[0047] Device operation process like Figure 1 , Figure 2 As shown, after the diesel engine starts, the flywheel 2 rotates, which drives the circulating water pump 4 through the belt 6. The water pump impeller rotates at high speed to form a suction and pressurization effect.

[0048] The circulating water pump 4 generates a negative pressure suction effect, and the high-temperature cooling water after absorbing heat in the diesel engine body is transported to the circulating water pump inlet 42 through the water tank outlet 31, pipe joint, and pipeline 8. After being pressurized by the circulating water pump 4, the high-temperature cooling water is transported from the water pump outlet 43 to the electric fan radiator assembly inlet 53 through the pipeline 8.

[0049] High-temperature cooling water flows into the internal channel of the radiator body 51, and the heat in the water is conducted to the radiator shell and the outer heat dissipation fins; the electric fan 52 runs continuously, and the forced airflow blows the radiator surface and fins, quickly removing the heat, and the high-temperature cooling water is cooled to form low-temperature cooling water.

[0050] After cooling, the cooling water flows out from the outlet of the radiator body 51, flows back to the return water port 32 of the diesel engine water tank through the pipeline 8, and flows back into the diesel engine body to absorb the heat generated during operation. After the water temperature rises, it is drawn back by the circulating water pump 4 to start a new round of cooling cycle.

[0051] Cooling water continuously circulates in a closed-loop pipeline, forming a continuous cooling cycle: low-temperature water enters the engine block to absorb heat, high-temperature water flows out of the engine block for air cooling, and cold water flows back into the engine block. The heat generated by the diesel engine is continuously transferred to the outside for dissipation, stabilizing the engine block temperature within the standard operating range and eliminating coolant overheating problems caused by heat buildup.

[0052] The specific embodiments of the present invention have been described in detail above, but they are merely examples, and the present invention is not equivalent to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A circulating cooling device for a single-cylinder diesel engine, comprising a frame (1), wherein a diesel engine flywheel (2) and a diesel engine water tank (3) are mounted on the frame (1), characterized in that, It also includes a circulating water pump (4) and an electric fan radiator assembly (5); The diesel engine water tank (3), the circulating water pump (4), and the electric fan radiator assembly (5) are connected in sequence through pipelines (8) to form a closed-loop cooling circuit; The diesel engine flywheel (2) and the circulating water pump (4) are connected by a belt (6); The circulating water pump (4) is fixedly installed on the frame (1) by a mechanical pump frame (7).

2. The circulating cooling device for a single-cylinder diesel engine according to claim 1, characterized in that, The diesel engine water tank (3) is provided with a water tank outlet (31) and a water tank return outlet (32). The circulating water pump (4) is provided with a water pump inlet (42) and a water pump outlet (43). The electronic fan radiator assembly (5) is provided with a radiator assembly inlet (53) and a radiator assembly outlet (54). The water tank outlet (31) is connected to the water pump inlet (42). The water pump outlet (43) is connected to the radiator assembly inlet (53). The radiator assembly outlet (54) is connected to the water tank return outlet (32).

3. The single-cylinder diesel engine circulating cooling device according to claim 1, characterized in that, The diesel engine flywheel (2) is provided with a pulley (21), and the circulating water pump (4) is provided with a water pump pulley (41). The belt (6) is in transmission cooperation with the pulley (21) and the water pump pulley (41) respectively.

4. The single-cylinder diesel engine circulating cooling device according to claim 1, characterized in that, The mechanical pump frame (7) is welded and fixed to the frame (1).

5. A single-cylinder diesel engine circulating cooling device according to claim 1, characterized in that, The electronic fan heat sink assembly (5) includes a heat sink body (51) and an electronic fan (52) disposed on the side of the heat sink body (51).

6. A single-cylinder diesel engine circulating cooling device according to claim 2, characterized in that, A pipe connector is provided at the water outlet (31) of the water tank, and the pipe connector is used to connect the pipeline (8) between the diesel engine water tank (3) and the circulating water pump (4).

7. A single-cylinder diesel engine circulating cooling device according to claim 1, characterized in that, The pipe connector is a 90-degree air pipe connector. One end of the 90-degree air pipe connector is connected to the water outlet (31) of the water tank, and the other end is welded with an iron pipe.

8. A single-cylinder diesel engine circulating cooling device according to claim 1, characterized in that, The pipe (8) of the closed-loop cooling circuit is a water pipe.

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