Pump-free cooling system of water pump engine

Abstract

The utility model discloses a pump-free cooling system of a water pump engine, which belongs to the field of engine cooling and comprises an engine cylinder, the engine cylinder is fixedly linked with a crankcase, a cylinder cover is arranged at the top of the cylinder, and the engine can be cooled through cooling liquid in a cooling liquid interlayer when started. A cooling liquid interlayer is arranged on an engine cylinder, a crankcase is provided with a cooling liquid inlet used for filling liquid into the interlayer, a plurality of cooling liquid channels are formed in the circumferential direction of a cylinder cover, exhaust holes used for exhausting cooling liquid gas are formed in the top of the cylinder cover, and circulation of cooling liquid in the cooling liquid interlayer is achieved in combination with a cooling liquid backflow device. And meanwhile, a cooling water pipeline is arranged on the cylinder cover, pumped water penetrates through the cylinder cover during the operation of the water pump, the cylinder can be cooled, cooling liquid can be cooled, the multiple cooling effect is achieved, the temperature of the water pump engine during working is maintained, and overheating of the engine is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of engine cooling, specifically to a pumpless cooling system for a water pump engine. Background Technology

[0002] A water pump is a machine that transports or pressurizes liquids. During its operation, the water pump plays a crucial role in cooling the engine cylinders. Engine cylinders have specific temperature ranges during use; overheating can cause cylinder scoring and damage to the engine block, while undercooling can cause the cylinder and piston to enter a semi-friction state, affecting their lifespan. Piston rings are much harder than the cylinder coating, and uneven cooling can also lead to cylinder bore loss of roundness, uneven coating wear, and reduced lifespan.

[0003] Chinese utility model patent publication number "CN217813665U" discloses a water pump engine cooling structure, including a water pump, an engine that drives the water pump, an engine cylinder cooling water passage, an impeller installed inside the pump, a high-pressure cooling water outlet, and a low-pressure cooling water return. The structure utilizes the principle of different liquid pressures at different locations during pump operation to allow the liquid to circulate between the engine cylinder, cylinder head, and water pump. By arranging the high-pressure cooling water outlet of the water pump and the cylinder inlet, rapid cooling of the engine cylinder is achieved.

[0004] However, the aforementioned water pump engine cooling structure still has the following drawbacks:

[0005] First, the cooling structure only uses external water passing through the pump to cool the engine cylinders. Since the pump takes a certain amount of time to pump water, the engine will accumulate heat when it starts. When the coolant enters the engine cylinder, the coolant and the engine cylinder will produce an evaporation effect, which will significantly reduce the cooling efficiency. At the same time, the local high temperature generated when the coolant evaporates may cause uneven thermal expansion of the cylinder wall and piston surface, which will lead to thermal stress concentration. Under long-term thermal stress, the engine cylinder wall may develop microcracks, or even cause local deformation or rupture of the cylinder wall.

[0006] Secondly, the water vapor formed after the cooling water evaporates may not be able to escape in time, further aggravating the high-temperature environment in the combustion chamber. This promotes carbon deposit formation, affects combustion efficiency, and may even cause abnormal combustion phenomena such as knocking or pre-ignition. In severe cases, it may damage the piston top or valves. At the same time, the sudden temperature changes caused by the cooling water evaporation effect will cause engine parts to repeatedly undergo thermal expansion and contraction, thereby accelerating material fatigue damage, reducing the structural strength of the parts, and ultimately causing cracks or fractures.

[0007] Third, cooling the cylinders with external water can cause corrosion to the engine because the external water carries impurities and other substances. In addition, a large amount of external water will remain after the engine stops working, which can easily cause scale buildup inside the engine, making it difficult to clean and potentially leading to engine failure.

[0008] Therefore, it is necessary to improve upon the aforementioned shortcomings. Utility Model Content

[0009] The purpose of this invention is to provide a pumpless cooling system for water pump engines that does not require an external circulation pump, has strong cooling capacity, simple structure, and convenient maintenance, in order to solve the above-mentioned problems existing in the prior art.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a pumpless cooling system for a water pump engine, including an engine cylinder, a crankcase fixedly linked to the engine cylinder, a cylinder head on the top of the cylinder, a spark plug passing through the middle of the cylinder head, a coolant-liquid jacket surrounding the cylinder on the inner wall of the cylinder, several coolant channels connecting the coolant jacket on the cylinder head, an exhaust port on the end of the cylinder head away from the cylinder, a coolant inlet connecting the coolant jacket on the crankcase, a coolant return device linked to the cylinder, one end of the coolant return device being engaged with the exhaust port and the other end being engaged with the coolant inlet, and a cooling water pipe for cooling the cylinder head and the coolant on the cylinder head.

[0011] By adopting the above technical solution, the engine can be cooled by the coolant in the coolant jacket when it starts. Compared with the existing technology that uses external water pumped by a water pump to circulate between the cylinder, cylinder head and water pump, this solution uses a coolant jacket in the engine cylinder, a coolant inlet in the crankcase for filling the jacket, multiple coolant channels in the circumference of the cylinder head and an exhaust port at the top for coolant gas discharge. Combined with a coolant return device, the coolant in the coolant jacket circulates. At the same time, a cooling water pipe is installed in the cylinder head. During the operation of the water pump, the pumped water passes through the cylinder head, which cools both the cylinder and the coolant, achieving a multiple cooling effect. This maintains the temperature of the water pump engine during operation and effectively prevents the engine from overheating.

[0012] The pumpless cooling system of the above-mentioned water pump engine can be further configured as follows: the cylinder head is divided into an upper cylinder head, a lower cylinder head and a flat cover, the exhaust port is located on the end face of the flat cover, a cooling chamber for cooling water flow is opened in the middle of the lower cylinder head, and an inlet for cooling water to enter and an outlet for cooling water to flow out are provided on the circumferential surface of the lower cylinder head, and the inlet and outlet are connected to the cooling chamber.

[0013] By adopting the above technical solution: the cylinder head is divided into three parts. Coolant channels are distributed on the upper and lower cylinder heads. The coolant in the coolant jacket flows through the coolant channels to the bottom of the flat cover. When the coolant cools the cylinder surface, it transfers heat to the cylinder head. External water drawn in by the water pump enters the cooling chamber through the inlet. Because the cooling chamber is annularly located around the spark plug and occupies a large area of ​​the lower cylinder head, it can hold more external water, thus providing stronger cooling for the cylinder head. Simultaneously, since the coolant channels are circumferentially located between the cooling chamber and the cylinder head, the flowing water in the cooling chamber cools the coolant, reducing its evaporation efficiency and preventing excessive coolant vapor accumulation in the coolant jacket, thereby improving cylinder stability. Furthermore, when cleaning and maintaining the cylinder head, by disassembling it into multiple parts, the cooling channels, cooling pipes, and cooling chamber can be cleaned quickly, preventing corrosion caused by residual external water inside the cylinder head.

[0014] The aforementioned pumpless cooling system for the water pump engine can be further configured as follows: a coolant chamber is provided at the end of the upper cylinder head away from the lower cylinder head, the coolant chamber is connected to the exhaust port and the coolant passage, a first gasket is provided at the connection between the flat cover and the upper cylinder head, a second gasket is provided at the connection between the upper cylinder head and the lower cylinder head, a third gasket is provided at the connection between the lower cylinder head and the cylinder, the first gasket, the second gasket and the third gasket have flow holes, the cylinder head has several first fixing holes along the axial direction, and the cylinder head has several second fixing holes on the circumferential surface at the connection between the cylinder and the cylinder head that are linked to the first fixing holes.

[0015] By adopting the above technical solution: the coolant chamber can contain both coolant and coolant vapor, thereby allowing coolant vapor to enter the coolant return device through the exhaust port, improving the coolant circulation capacity. The first, second, and third gaskets at the joints of various parts of the cylinder head can improve the overall sealing of the cylinder head, preventing coolant from flowing out from gaps and causing coolant leakage. The flow holes can improve the fluidity of the coolant. At the same time, the first fixing hole set along the axial direction of the cylinder head, which penetrates the flat cover, upper cylinder head, and lower cylinder head, and the second fixing hole of the linkage cylinder can realize the stable connection between the cylinder head and the cylinder, preventing the cylinder head and cylinder from loosening, and improving the airtightness and stability of the engine cylinder.

[0016] The aforementioned pumpless cooling system for the water pump engine can be further configured as follows: the coolant return device includes a coolant tank, an overflow vent pipe connected to the vent hole, and an inlet hose connected to the coolant inlet. The coolant tank has a coolant cavity in the middle, and the coolant tank is connected to the coolant cavity by a return connection pipe and an outlet connection pipe. The overflow vent pipe is sleeved on the return connection pipe, and the inlet hose is sleeved on the outlet connection pipe.

[0017] By adopting the above technical solution: one end of the overflow vent pipe is connected to the vent hole, and the other end is connected to the return connection pipe of the coolant tank. The coolant vapor gradually condenses into coolant through the overflow vent pipe and flows back into the coolant cavity in the coolant tank. The inlet hose is connected to the coolant inlet through the outlet connection pipe. The condensed coolant is replenished into the coolant jacket through the inlet hose, realizing the self-circulation of coolant between the coolant jacket, coolant channel and coolant tank.

[0018] The above-mentioned pumpless cooling system for water pump engine can be further configured as follows: the cooling tank has a liquid inlet on one side of the return liquid connection pipe, the liquid inlet is threaded with a sealing cap, and the outer periphery of the cooling tank is also provided with several mounting blocks for installing the cooling tank, and the mounting blocks are provided with mounting holes.

[0019] By adopting the above technical solution, when the coolant in the cylinder is insufficient, the sealing cap on the filler port can be removed to fill the coolant tank. Then, the coolant tank is replenished through the inlet hose to replenish the coolant jacket, simplifying the complexity of replenishing the cylinder coolant. At the same time, the sealing cap can prevent the coolant in the coolant tank from sealing itself, and the several mounting blocks on the outer periphery of the coolant tank can provide multiple support and fixing points for the coolant tank, which can be fixed in different positions, improving the ease of installation of the coolant return device.

[0020] The aforementioned pumpless cooling system for the water pump engine can be further configured as follows: the cylinder is provided with an obliquely arranged exhaust port, and the exhaust port is provided with several spaced exhaust port mounting ears around its circumference; the connection between the cylinder and the crankcase is provided with several cylinder connecting ears; a first connecting hole is opened in the middle of the cylinder connecting ears; several second connecting holes are opened at the connection between the crankcase and the cylinder, which are linked to the first connecting hole; and connecting bolts are inserted into the first and second connecting holes.

[0021] By adopting the above technical solutions: the obliquely set exhaust port can guide the combustion exhaust gas out more efficiently, reduce the residual exhaust gas in the cylinder, thereby improving combustion efficiency. The circumferential mounting lug design of the exhaust port provides the possibility of multi-point fixation, enhances the structural strength of the exhaust port, and ensures its stability under high temperature and high pressure environment. In addition, the cylinder connecting lug and connecting bolt design at the connection between the cylinder and the crankcase ensures a tight connection between the cylinder and the crankcase through multi-point fixation, while improving the stability and sealing of the entire system, optimizing the exhaust gas discharge path, and further improving the engine operating efficiency.

[0022] The aforementioned pumpless cooling system for the water pump engine can be further configured as follows: the crankcase is divided into an upper crankcase and a lower crankcase, the upper crankcase is provided with a number of first crankcase connecting ears on its circumference, the lower crankcase is provided with a number of second crankcase connecting ears that are linked to the first crankcase connecting ears, the connection between the upper crankcase and the lower crankcase is also provided with a first connecting block and a second connecting block, and a crankcase fixing bolt for fixing the upper crankcase and the lower crankcase is provided between the first crankcase connecting ears, the second crankcase connecting ears, the first connecting block and the second connecting block.

[0023] By adopting the above technical solution, the crankcase is divided into an upper crankcase and a lower crankcase, making its installation and maintenance more convenient. Furthermore, the use of multiple connecting lugs and connecting blocks further enhances the overall strength and sealing of the crankcase. The use of crankcase retaining bolts ensures a tight connection between the upper and lower crankcases. The coolant inlet is located on the upper crankcase, and the inner wall of the upper crankcase has an inlet channel that accommodates coolant and communicates with the coolant jacket. This not only ensures the stability of the crankcase but also provides reliable structural support for coolant circulation, ensuring the efficient operation of the cooling system and guaranteeing the long-term stable operation of the engine.

[0024] The beneficial effects of this utility model are as follows:

[0025] First, by setting a coolant jacket between the inner and outer walls of the cylinder and adding sufficient coolant to the coolant jacket, the engine can be cooled efficiently. At the same time, the coolant jacket enters the cylinder head through the coolant passages on the cylinder head. Multiple coolant passages can hold a large amount of coolant. During water pumping, water can be filled into the cooling chamber through the inlet pipe and flow back to the water pump outlet through the outlet pipe. This can cool the cylinder head, as well as the coolant in the coolant passages and the cooling chamber, achieving a multi-stage cooling effect for the engine. This significantly reduces the temperature of the engine during water pump operation and effectively prevents the engine from overheating.

[0026] Secondly, the cooling system has an exhaust port on the top of the cylinder head and a coolant inlet in the crankcase that connects to the coolant jacket. A coolant return device is linked to the exhaust port and the coolant inlet. When the engine is running, the evaporated coolant enters the coolant chamber of the coolant tank through the overflow exhaust pipe, and then re-enters the coolant inlet channel at the coolant inlet through the outlet hose to achieve internal circulation of the coolant. In addition, the replenishment port on the surface of the coolant tank that connects to the coolant chamber can quickly replenish the coolant. That is, adding coolant to the coolant tank can increase the coolant content in the cylinder, thereby improving the cooling life of the coolant and the convenience of replenishment.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0028] Figure 1This is a schematic diagram of the pumpless cooling system of this utility model;

[0029] Figure 2 This is a cross-sectional schematic diagram of the pumpless cooling system of this utility model;

[0030] Figure 3 This is a schematic diagram showing the disassembled pumpless cooling system of this utility model;

[0031] Figure 4 This is a schematic diagram of the cylinder body structure of this utility model;

[0032] Figure 5 This is a schematic diagram of the overall structure of the cylinder head of this utility model;

[0033] Figure 6 This is a schematic diagram showing the disassembled cylinder head of this utility model;

[0034] Figure 7 This is a schematic diagram of the coolant reflux device of this utility model;

[0035] Figure 8 This is a schematic diagram showing the disassembled coolant reflux device of this utility model;

[0036] Figure 9 This is a schematic diagram of the disassembled axle box of this utility model;

[0037] Labeling notes: Cylinder body 1, Coolant jacket 11, Second fixing hole 12, Exhaust port 13, Mounting lug 131, Cylinder connecting lug 14, First connecting hole 141, Connecting bolt 142, Cylinder head 2, Coolant passage 21, Exhaust port 22, Coolant pipe 23, Inlet 231, Outlet 232, Upper cylinder head 24, Coolant chamber 241, Second gasket 242, Lower cylinder head 25, Cooling chamber 251, Third gasket 252, Flat cover 26, First gasket 261, First fixing hole 27. Crankcase 3, coolant inlet 31, second connecting hole 32, upper shaft box 33, first shaft box connecting lug 331, first connecting block 332, lower shaft box 34, second shaft box connecting lug 341, second connecting block 342, fixing bolt 35, spark plug 4, coolant return device 5, coolant reservoir 51, coolant chamber 511, return connection pipe 512, outlet connection pipe 513, replenishment port 514, sealing cap 515, mounting block 516, mounting hole 517, overflow vent pipe 52, inlet hose 53. Detailed Implementation

[0038] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] like Figures 1 to 9 The illustrated pumpless cooling system for a water pump engine includes an engine cylinder body 1, a crankcase 3 fixedly linked to the engine cylinder body 1, a cylinder head 2 on the top of the cylinder body 1, a spark plug 4 passing through the middle of the cylinder head 2, a coolant-liquid jacket surrounding the cylinder in the cylinder wall of the cylinder body 1, several coolant channels 21 communicating with the coolant jacket 11 in the cylinder head 2, an exhaust port 22 at the end of the cylinder head 2 away from the cylinder, a coolant inlet 31 communicating with the coolant jacket 11 in the crankcase 3, a coolant return device 5 linked to the cylinder, one end of the coolant return device 5 being engaged with the exhaust port 22 and the other end being engaged with the coolant inlet 31, and a cooling water pipe 23 for cooling the cylinder head 2 and the coolant. When the engine starts, it can be cooled by the coolant in the coolant jacket 11. Compared with the existing technology that uses external water pumped by a water pump to circulate between the cylinder body 1, cylinder head 2 and water pump, the coolant jacket 11 is set in the engine cylinder, the crankcase 3 is provided with a coolant inlet 31 for filling the jacket, multiple coolant channels 21 are set around the cylinder head 2 and an exhaust port 22 for coolant gas discharge is set at the top, and the coolant circulates in the coolant jacket 11 in combination with the coolant return device 5. At the same time, a cooling water pipe 23 is set in the cylinder head 2. During the operation of the water pump, the pumped water passes through the cylinder head 2, which can cool both the cylinder body 1 and the coolant, achieving a multiple cooling effect. This maintains the temperature of the water pump engine when it is working and effectively avoids engine overheating.

[0040] The cylinder head 2 is divided into an upper cylinder head 24, a lower cylinder head 25, and a flat cover 26. The exhaust port 22 is located on the end face of the flat cover 26. The lower cylinder head 25 has a cooling chamber 251 for cooling water flow in the middle. The lower cylinder head 25 has an inlet 231 for cooling water to enter and an outlet 232 for cooling water to flow out on its circumference. The inlet 231 and the outlet 232 are connected to the cooling chamber 251. The cylinder head 2 is divided into three parts. The coolant passage 21 is distributed on the upper cylinder head 24 and the lower cylinder head 25. The coolant in the coolant jacket 11 passes through the coolant passage 21 to the bottom of the flat cover 26. When the coolant cools the cylinder surface, it will transfer heat to the cylinder head 2. When the water pump is working, the external water drawn in enters the cooling chamber 251 through the water inlet 231. Since the cooling chamber 251 is arranged in a ring around the spark plug 4 and occupies a large area of ​​the lower cylinder head 25, it can hold more external water, so the cooling capacity of the cylinder head 2 is stronger. At the same time, since the coolant passage 21 is arranged circumferentially between the cooling chamber 251 and the cylinder head 2, the flowing water in the cooling chamber 251 will cool the coolant, reduce the evaporation efficiency of the coolant, prevent excessive coolant vapor from accumulating in the coolant jacket 11, and improve the stability of the cylinder.

[0041] A coolant chamber 241 is provided at the end of the upper cylinder head 24 away from the lower cylinder head 25. The coolant chamber 241 is connected to the exhaust port 13 and the coolant passage 21. A first gasket 261 is provided at the connection between the flat cover 26 and the upper cylinder head 24. A second gasket 242 is provided at the connection between the upper cylinder head 24 and the lower cylinder head 25. A third gasket 252 is provided at the connection between the lower cylinder head 25 and the cylinder. The first gasket 261, the second gasket 242 and the third gasket 252 are provided with flow holes. A number of first fixing holes 27 are provided along the axial direction of the cylinder head 2. A number of second fixing holes 12 that are linked with the first fixing holes 27 are provided on the circumferential surface of the connection between the cylinder body 1 and the cylinder head 2. The coolant chamber 241 can hold both coolant and coolant vapor, allowing coolant vapor to enter the coolant return device 5 through the exhaust port 22, thus improving the coolant circulation capacity. The first gasket 261, the second gasket 242, and the third gasket 252 at the joints of the cylinder head 2 improve the overall sealing of the cylinder head 2, preventing coolant from flowing out of the gaps and causing coolant leakage. The flow hole improves the fluidity of the coolant. At the same time, the first fixing hole 27, which is provided along the axial direction of the cylinder head 2, penetrates the flat cover 26, the upper cylinder head 24, and the lower cylinder head 25, and the second fixing hole 12 of the cylinder body 1, can realize the stable connection between the cylinder head 2 and the cylinder, prevent the cylinder head 2 and the cylinder from loosening, and improve the airtightness and stability of the engine cylinder.

[0042] The coolant return device 5 includes a coolant tank 51, an overflow vent pipe 52 connected to the vent 22, and an inlet hose 53 connected to the coolant inlet 31. The coolant tank 51 has a coolant cavity 511 in the middle. The coolant tank 51 is connected to the coolant cavity 511 by a return connection pipe 512 and an outlet connection pipe 513. The overflow vent pipe 52 is sleeved on the return connection pipe 512, and the inlet hose 53 is sleeved on the outlet connection pipe 513. One end of the overflow vent pipe 52 is connected to the vent hole 22, and the other end is connected to the return connection pipe 512 of the coolant tank 51. The coolant vapor gradually condenses into coolant through the overflow vent pipe 52 and flows back into the coolant cavity 511 in the coolant tank 51. The inlet hose 53 is connected to the coolant inlet 31 through the outlet connection pipe 513. The condensed coolant is replenished into the coolant jacket 11 through the inlet hose 53, realizing the self-circulation of coolant between the coolant jacket 11, the coolant channel 21 and the coolant tank 51.

[0043] The coolant reservoir 51 has a replenishment port 514 on one side of the return connection pipe 512. A sealing cap 515 is threaded onto the replenishment port 514. Several mounting blocks 516 for installing the coolant reservoir 51 are also provided on the outer periphery of the coolant reservoir 51. The mounting blocks 516 have mounting holes 517. When the coolant in the cylinder body 1 is insufficient, the sealing cap 515 on the replenishment port 514 can be removed to fill the coolant reservoir 51. Then, the coolant reservoir 51 replenishes the coolant jacket 11 through the inlet hose 53, simplifying the complexity of replenishing the coolant in the entire cylinder. At the same time, the sealing cap 515 can prevent the coolant in the coolant reservoir 51 from sealing. In addition, the several mounting blocks 516 on the outer periphery of the coolant reservoir 51 can provide multiple support mounting points for the coolant reservoir 51, which can be fixed in different positions, improving the ease of installation of the coolant return device 5.

[0044] The cylinder body 1 is provided with an obliquely arranged exhaust port 13. The exhaust port 13 is provided with a number of spaced exhaust port 13 mounting ears 131. The connection between the cylinder and the crankcase 3 is provided with a number of cylinder connecting ears 14. A first connecting hole 141 is opened in the middle of the cylinder connecting ears 14. The connection between the crankcase 3 and the cylinder is provided with a number of second connecting holes 32 that are linked with the first connecting holes 141. Connecting bolts 142 are inserted into the first connecting holes 141 and the second connecting holes 32. The obliquely positioned exhaust port 13 can guide the combustion exhaust gas out more efficiently, reduce the residue of exhaust gas in the cylinder, and thus improve combustion efficiency. The circumferential mounting lug 131 design of the exhaust port 13 provides the possibility of multi-point fixation, enhances the structural strength of the exhaust port 13, and ensures its stability under high temperature and high pressure environment. In addition, the cylinder connecting lug 14 and connecting bolt 142 design at the connection between the cylinder body 1 and the crankcase 3 ensure a tight connection between the cylinder body 1 and the crankcase 3 through multi-point fixation, while improving the stability and sealing of the entire system, optimizing the exhaust gas discharge path, and further improving the engine operating efficiency.

[0045] The crankcase 3 is divided into an upper crankcase 33 and a lower crankcase 34. The upper crankcase 33 has several first crankcase connecting ears on its circumference, and the lower crankcase 34 has several second crankcase connecting ears 341 that are linked to the first crankcase connecting ears. A first connecting block 332 and a second connecting block 342 are also provided at the connection between the upper crankcase 33 and the lower crankcase 34. Crankcase fixing bolts 35 are provided between the first crankcase connecting ears 331 and the second crankcase connecting ears 341, as well as between the first connecting blocks 332 and the second connecting blocks 342, for fixing the upper crankcase 33 and the lower crankcase 34. The division of the crankcase 3 into an upper crankcase 33 and a lower crankcase 34 makes the installation and maintenance of the crankcase 3 more convenient. At the same time, the cooperation of multiple connecting ears and connecting blocks further enhances the overall strength and sealing performance of the crankcase 3. The use of crankcase fixing bolts 35 ensures a tight connection between the upper crankcase 33 and the lower crankcase 34. The coolant inlet 31 is located on the upper crankcase 33. The inner wall of the upper crankcase 33 has an inlet channel that accommodates coolant and communicates with the coolant jacket 11. This not only ensures the stability of the crankcase 3, but also provides reliable structural support for coolant circulation, ensuring the efficient operation of the cooling system and providing a guarantee for the long-term stable operation of the engine.

[0046] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A water pump engine pumpless cooling system comprising an engine cylinder fixedly linked with a crankcase, a cylinder head is arranged on the top of the cylinder, a spark plug is arranged in the middle of the cylinder head, characterized in that: The cylinder is provided with a cold liquid layer around the cylinder, the cylinder head is provided with a plurality of cooling liquid channels connected with the cooling liquid layer, the end of the cylinder head away from the cylinder is provided with an exhaust hole, the crankcase is provided with a cooling liquid inlet connected with the cooling liquid layer, the cylinder is connected with a cooling liquid return device, one end of the cooling liquid return device is connected with the exhaust hole and the other end is connected with the cooling liquid inlet, and the cylinder head is further provided with a cooling water pipeline for cooling the cylinder head and the cooling liquid.

2. The water pump engine pumpless cooling system of claim 1, wherein: The cylinder head is divided into an upper cylinder head, a lower cylinder head and a flat head, the exhaust hole is arranged on the end face of the flat head, the middle part of the lower cylinder head is provided with a cooling cavity for cooling water flow, and the circumferential surface of the lower cylinder head is provided with a water inlet for cooling water entering and a water outlet for cooling water flowing out, which are communicated with the cooling cavity.

3. The pump-coolant system of claim 2, wherein: The end of the upper cylinder head away from the lower cylinder head is provided with a cooling liquid cavity, the cooling liquid cavity is communicated with the exhaust hole and the cooling liquid channel, the first gasket is arranged at the connection between the flat head and the upper cylinder head, the second gasket is arranged at the connection between the upper cylinder head and the lower cylinder head, the third gasket is arranged at the connection between the lower cylinder head and the cylinder, the first gasket, the second gasket and the third gasket are provided with flow holes, a plurality of first fixing holes are arranged on the cylinder head along the axial direction, and a plurality of second fixing holes are arranged on the circumferential surface of the connection between the cylinder and the cylinder head and are connected with the first fixing holes.

4. The pump-coolant system of a water pump engine according to any one of claims 1 to 3, characterized in that: The cooling liquid return device comprises a cooling kettle, an overflow exhaust pipe connected with the exhaust hole and a liquid inlet rubber pipe connected with the cooling liquid inlet, the middle part of the cooling kettle is provided with a cooling liquid cavity, the cooling kettle is provided with a liquid return connecting pipe and a liquid outlet connecting pipe connected with the cooling liquid cavity, the overflow exhaust pipe is sleeved on the liquid return connecting pipe, and the liquid inlet rubber pipe is sleeved on the liquid outlet connecting pipe.

5. The pump-coolant system of claim 4, wherein: The cooling kettle is provided with a liquid supplementing port on one side of the liquid return connecting pipe, a sealing cover is threadedly connected to the liquid supplementing port, and a plurality of mounting blocks for mounting the cooling kettle are further arranged on the outer circumferential surface of the cooling kettle.

6. The water pump engine pumpless cooling system of claim 1, wherein: The cylinder is provided with an exhaust port arranged obliquely, a plurality of exhaust port mounting ears are arranged on the circumferential surface of the exhaust port at intervals, a plurality of cylinder connecting ears are arranged at the connection between the cylinder and the crankcase, a first connecting hole is arranged in the middle part of the cylinder connecting ear, a plurality of second connecting holes are arranged at the connection between the crankcase and the cylinder and are connected with the first connecting hole, and a connecting bolt is arranged in the first connecting hole and the second connecting hole.

7. The water pump engine pumpless cooling system of claim 6, wherein: The crankcase is divided into an upper crankcase and a lower crankcase, a plurality of first crankcase connecting ears are arranged on the circumferential surface of the upper crankcase, a plurality of second crankcase connecting ears are arranged on the lower crankcase and are connected with the first crankcase connecting ears, and a first connecting block and a second connecting block are further arranged at the connection between the upper crankcase and the lower crankcase, and a crankcase fixing bolt for fixing the upper crankcase and the lower crankcase is arranged between the first crankcase connecting ear, the second crankcase connecting ear, the first connecting block and the second connecting block.

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