Pump-free cooling system of water pump engine

Abstract

The invention discloses a pump-free cooling system of a water pump engine, which comprises an engine cylinder body, a crankcase fixed on the cylinder body, a cylinder cover arranged on the cylinder body, a spark plug penetrating through the cylinder cover, a cooling interlayer arranged in the cylinder wall of the cylinder body, and a plurality of cooling channels communicated with the cooling interlayer arranged on the cylinder cover. The crankcase is provided with a cooling liquid inlet communicated with the cooling interlayer, and the air cylinder cover is further provided with a cooling pipeline transversely penetrating through the air cylinder cover. The cooling interlayer is arranged on the engine cylinder, meanwhile, the cooling pipeline is arranged on the cylinder cover, part of pumped water is shunted during operation of the water pump, the shunted part penetrates through the cylinder cover, the cylinder can be cooled, cooling liquid can be cooled, and the effect of multiple cooling of the engine is achieved; the temperature of the water pump engine during working is maintained, the problem that the engine is damaged due to sudden contact with cooling water during operation is effectively avoided, and the working stability of the water pump engine is improved.

Description

Technical Field

[0001] The present invention relates to the field of engine cooling, and particularly to a pumpless cooling system for a water pump engine. Background Art

[0002] A water pump is a machine that transports liquids or pressurizes liquids. During the use of a water pump, the cooling effect on the engine cylinder is crucial. The engine cylinder has a specific temperature range during use. Overheating will cause cylinder pulling and damage to the engine body, while overcooling will cause the cylinder and piston to enter a semi-friction state, affecting the service life of the cylinder and piston. The hardness of the piston ring is much higher than that of the cylinder coating. Uneven cooling will also cause the inner hole of the cylinder to become out-of-round, uneven wear of the coating, and a decrease in service life. The Chinese invention patent with the publication number "CN217813665U" discloses a cooling structure for a water pump engine, including a water pump, an engine that drives the water pump, a cooling water circuit for the engine cylinder, an impeller arranged inside the pump, a high-pressure water outlet hole for cooling water, and a low-pressure water return hole for cooling water. The liquid circulates between the engine cylinder, the cylinder head, and the water pump based on the principle that the pressure of the liquid is different at different positions when the water pump works. By arranging the high-pressure water outlet hole of the water pump cooling water and the position of the cylinder water inlet hole, the engine cylinder can be quickly cooled.

[0003] However, the above cooling structure for a water pump engine still has the following defects: First, the cooling structure only uses the externally passing water when the water pump is working to cool the engine cylinder. Since it takes a certain amount of time for the water pump to pump water, heat will accumulate when the engine starts. When the cooling water enters the engine cylinder, an evaporation effect occurs between the cooling water and the engine cylinder, resulting in a significant decrease in cooling efficiency. At the same time, the local high temperature generated during the evaporation of the cooling water may cause uneven thermal expansion of the cylinder wall and the piston surface, thereby triggering thermal stress concentration. Under the long-term action of thermal stress, microcracks may appear on the engine cylinder wall, and even local deformation or rupture of the cylinder wall may occur.

[0004] Second, the water vapor formed after the evaporation of the cooling water may not be discharged in time, resulting in a further increase in the high-temperature environment in the combustion chamber. This will promote the formation of carbon deposits, affect the combustion efficiency, and even trigger abnormal combustion phenomena such as knocking or pre-ignition. In severe cases, it may cause damage to the piston top or valves. At the same time, the sudden temperature change caused by the evaporation effect of the cooling water will cause the engine components to repeatedly undergo thermal expansion and contraction, thereby accelerating the fatigue damage of the materials, leading to a decrease in the structural strength of the components, and ultimately triggering cracks or fractures.

[0005] Third, when cooling the cylinder with external water, since the external water will carry impurities and cleaning substances, it will corrode the engine. At the same time, a large amount of external water will remain after the engine stops working, which is easy to form scale in the engine and is not easy to clean, and the engine is prone to necrosis.

[0006] Therefore, it is necessary to improve the above-mentioned defects. Summary of the Invention

[0007] The object of the present invention is to provide a pump-free cooling system for a water pump engine that does not require an external circulation pump, has strong cooling capacity, a simple structure, and is convenient to maintain, so as to solve the above problems existing in the prior art.

[0008] To achieve the above object, the technical solution adopted by the present invention is: a pump-free cooling system for a water pump engine, including an engine cylinder block body, a crankcase is fixed to the cylinder block body, a cylinder head is provided on the top of the cylinder block body, a spark plug is provided through the middle of the cylinder head, a cooling interlayer surrounding the cylinder is provided in the cylinder wall of the cylinder block body, a plurality of cooling channels communicating with the cooling interlayer are provided on the cylinder head, an exhaust hole communicating with the cooling channels is provided on the end face of the cylinder head away from the cylinder, a coolant inlet communicating with the cooling interlayer is provided on the crankcase, and a cooling pipe horizontally penetrating the cylinder head is further provided on the cylinder head.

[0009] By adopting the above technical solution: when the engine starts, it can be cooled by the coolant in the cooling interlayer circumferentially arranged on the cylinder block body. Compared with the prior art, in which the external water pumped by the water pump circulates among the cylinder, the cylinder head and the water pump, by arranging a cooling interlayer in the engine cylinder, a coolant inlet for filling the interlayer is arranged on the crankcase, a plurality of cooling channels are arranged circumferentially on the cylinder head and an exhaust hole for discharging the coolant gas is arranged on the top, it is avoided that the coolant steam accumulates in the cooling interlayer. At the same time, a cooling pipe is arranged on the cylinder head. During the operation of the water pump, a part of the pumped water is diverted, and the diverted water passes through the cylinder head through the cooling pipe, which can not only cool the cylinder but also cool the coolant, achieving the effect of multiple cooling of the engine, maintaining the temperature of the water pump engine during operation, effectively avoiding the damage problem caused by the sudden contact with the cooling water when the engine runs, and improving the working stability of the water pump engine.

[0010] The above-mentioned pump-free cooling system for a water pump engine can be further set as: the cylinder head is divided into an upper cylinder head, a lower cylinder head and a flat cover, the exhaust hole is arranged on the end face of the flat cover, a cooling cavity for the cooling water to flow is arranged in the middle of the lower cylinder head, a water inlet for the cooling water to enter and a water outlet for the cooling water to flow out are arranged on the circumferential surface of the lower cylinder head, and the water inlet and the water outlet are communicated with the cooling cavity.

[0011] By adopting the above technical solution: the cylinder head is divided into three parts, the cooling channels are distributed on the upper cylinder head and the lower cylinder head, the coolant in the cooling interlayer passes through the cooling channel to the bottom of the flat cover, and the coolant transfers heat to the cylinder head when cooling the cylinder surface. The external water drawn by the water pump enters the cooling cavity through the water inlet when working. Since the cooling cavity is arranged in an annular shape around the spark plug and occupies a larger area of ​​the lower cylinder head, it can accommodate more external water, so the cooling capacity of the cylinder head is stronger. At the same time, since the cooling channel is arranged circumferentially between the cooling cavity and the cylinder head, the flowing water in the cooling cavity will cool the coolant, reduce the evaporation efficiency of the coolant, prevent the accumulation of too much coolant vapor in the cooling interlayer, and improve the stability of the cylinder. In addition, when cleaning and maintaining the cylinder head, by splitting it into multiple parts, the cooling channel, cooling pipe and cooling cavity can be quickly cleaned to prevent the cylinder head corrosion caused by the residual external water in the cylinder head.

[0012] The above-mentioned water pump engine pumpless cooling system can be further configured as follows: a cooling liquid chamber is opened on the end surface of the upper cylinder head away from the lower cylinder head, the cooling liquid chamber is connected with the cooling channel and the exhaust hole, 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 are opened with flow holes, the cylinder head is opened with a plurality of first fixing holes along the axial direction, and a plurality of second fixing holes linked to the first fixing holes are opened on the circumferential surface of the connection between the cylinder and the cylinder head.

[0013] By adopting the above technical scheme: the coolant cavity can accommodate both coolant and coolant vapor, so that the coolant vapor is discharged from the cooling pipe through the exhaust hole, so as to avoid the accumulation of coolant vapor in the cooling interlayer causing the pressure in the interlayer to increase, and the circulation capacity of the coolant is improved. The first gasket, the second gasket and the third gasket at the connection between the various parts of the cylinder head can improve the overall sealing of the cylinder head, prevent the coolant from flowing out from the gap and causing coolant leakage, and the flow hole can improve the fluidity of the coolant. At the same time, the first fixing hole is arranged along the axial direction of the cylinder head, and the first fixing hole passes through the flat cover, the upper cylinder head and the lower cylinder head. The second fixing hole of the linkage cylinder can realize the stable connection between the cylinder head and the cylinder, prevent the cylinder head and the cylinder from loosening, and improve the air tightness and stability of the engine cylinder.

[0014] The above-mentioned water pump engine pumpless cooling system can be further configured as: the cylinder is linked with a coolant reflux device, one end of the coolant reflux device is clamped with the exhaust hole, and the other end is clamped with the coolant inlet, the coolant reflux device includes a cooling pot, an overflow exhaust pipe connected to the exhaust hole and a liquid inlet hose connected to the coolant inlet, a coolant chamber is provided in the middle of the cooling pot, and the cooling pot is connected to the coolant chamber and is provided with a return liquid connecting pipe and a liquid outlet connecting pipe, the overflow exhaust pipe is sleeved on the return liquid connecting pipe, and the liquid inlet hose is sleeved on the liquid outlet connecting pipe.

[0015] By adopting the above technical solution: The coolant reflux device can achieve the circulating flow of the coolant in the engine. One end of the overflow exhaust pipe is connected to the exhaust hole, and the other end is sleeved with the liquid return connecting pipe of the cooling kettle. The coolant vapor is gradually condensed into coolant through the overflow exhaust pipe and flows back into the coolant cavity in the cooling kettle. The inlet rubber hose is connected to the coolant inlet through the outlet connecting pipe. The condensed coolant is replenished into the cooling sandwich through the inlet rubber hose, realizing the self-circulation of the coolant among the cooling sandwich, the cooling channel and the cooling kettle.

[0016] The above pump-less cooling system for a water pump engine can be further set as follows: The cooling kettle is provided with a liquid replenishing port on one side of the liquid return connecting pipe. A sealing cover is threadedly connected to the liquid replenishing port. Several mounting blocks for installing the cooling kettle are also provided on the outer periphery of the cooling kettle, and the mounting blocks are provided with mounting holes.

[0017] By adopting the above technical solution: When the coolant in the cylinder is insufficient, the sealing cover on the liquid replenishing port can be removed to fill the cooling kettle with liquid. Then the cooling kettle replenishes the cooling sandwich through the inlet rubber hose, simplifying the complexity of replenishing the coolant in the cylinder. At the same time, the sealing cover can prevent the coolant in the cooling kettle from leaking. At the same time, the several mounting blocks provided on the outer periphery of the cooling kettle can provide multiple support and fixing points for the cooling kettle, enabling it to be fixed at different positions and improving the installation convenience of the coolant reflux device.

[0018] The above pump-less cooling system for a water pump engine can be further set as follows: The crankcase is also provided with an inlet pipeline at the coolant inlet. The cylinder body is provided with an inlet port at the inlet pipeline. The coolant sandwich is connected to the inlet pipeline through the inlet port.

[0019] By adopting the above technical solution: The content of the coolant in the cooling sandwich on the engine cylinder can be increased in the inlet pipeline, improving the cooling capacity of the cooling sandwich for the engine. At the same time, the coolant sandwich is connected to the coolant inlet through the inlet port, facilitating the effective circulation and utilization of the coolant, and further improving the overall performance of the cooling system and the service life of the engine.

[0020] The above pump-less cooling system for a water pump engine can be further set as follows: The cylinder is provided with an obliquely arranged exhaust port. A number of spaced exhaust port mounting ears are circumferentially arranged around the exhaust port. A number of cylinder connection ears are provided at the connection between the cylinder and the crankcase. A first connection hole is opened in the middle of the cylinder connection ears. A number of second connection holes linked to the first connection hole are opened at the connection between the crankcase and the cylinder. A connecting bolt is passed through the first connection hole and the second connection hole.

[0021] By adopting the above technical solutions: The obliquely arranged exhaust port can more efficiently guide the combustion exhaust gas out, reduce the residue of the exhaust gas in the cylinder, thereby improving the combustion efficiency. The installation ear design around the exhaust port provides the possibility of multi-point fixation, enhancing the structural strength of the exhaust port and ensuring its stability in the high-temperature and high-pressure environment. In addition, the cylinder connection ear and connection bolt design at the connection between the cylinder and the crankcase ensure the tight connection between the cylinder and the crankcase through multi-point fixation, while improving the stability and sealing performance of the entire system, optimizing the exhaust path of the combustion exhaust gas, and further enhancing the operating efficiency of the engine.

[0022] The above pump-less engine cooling system can be further configured as follows: The crankcase is divided into an upper crankcase and a lower crankcase. A plurality of first crankcase connection ears are provided on the circumferential surface of the upper crankcase, and a plurality of second crankcase connection ears linked to the first crankcase connection ears are provided on the lower crankcase. A first connection block and a second connection block are also provided at the connection between the upper crankcase and the lower crankcase. Crankcase fixing bolts are provided between the first crankcase connection ears and the second crankcase connection ears, and between the first connection block and the second connection block for fixing the upper crankcase and the lower crankcase.

[0023] By adopting the above technical solutions: The crankcase is divided into an upper crankcase and a lower crankcase, making the installation and maintenance of the crankcase more convenient. At the same time, through the cooperation of multi-point connection ears and connection blocks, the overall strength and sealing performance of the crankcase are further enhanced. The use of crankcase fixing bolts ensures the tight connection between the upper crankcase and the lower crankcase. The liquid inlet channel and the coolant inlet are both provided on the upper crankcase, which not only ensures the stability of the crankcase but also provides a reliable structural support for the coolant circulation, ensuring the efficient operation of the cooling system and providing a guarantee for the long-term stable operation of the engine.

[0024] The beneficial effects of the present invention are as follows: First, by arranging a cooling sandwich layer inside the cylinder wall and adding a sufficient amount of coolant in the cooling sandwich layer to initially cool the engine. At the same time, the cooling sandwich layer enters the cylinder head through the cooling channels on the cylinder head. The multiple cooling channels can accommodate a relatively large amount of coolant. During the pumping of the water pump, water can be filled into the cooling cavity through the water inlet and flow back to the water pump outlet pipe through the water outlet, which can not only cool the cylinder head but also cool the coolant pipe and the coolant in the cooling cavity, eliminating the circulation pump, radiator, and cooling fan in the traditional cooling system, achieving the effect of multi-stage cooling of the pump-less engine, significantly reducing the temperature during the operation of the pump-less engine, with a simple overall structure and strong heat dissipation capacity.

[0025] Second, the cooling system has exhaust holes at the top of the cylinder head, a coolant inlet communicating with the cooling sandwich layer is provided in the crankcase, and a coolant reflux device is linked at the exhaust holes and the coolant inlet. When the engine is running, the evaporated cold liquid-gas enters the coolant cavity of the cooling kettle through the overflow exhaust pipe, and then re-enters the liquid inlet channel at the coolant inlet through the liquid outlet rubber tube to realize the internal circulation of the coolant. In addition, the liquid filling port on the surface of the cooling kettle communicating with the coolant cavity can quickly supplement the coolant, that is, adding coolant to the cooling kettle can increase the coolant content in the cylinder, improving the service life and replenishment convenience of the coolant in the cooling sandwich layer.

[0026] The present invention will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the pump-free cooling system of the present invention; Figure 2 is a schematic sectional view of the pump-free cooling system of the present invention; Figure 3 is a schematic exploded view of the pump-free cooling system of the present invention; Figure 4 is a schematic structural diagram of the cylinder body of the present invention; Figure 5 is a schematic overall structural diagram of the cylinder head of the present invention; Figure 6 is a schematic exploded view of the cylinder head of the present invention; Figure 7 is a schematic structural diagram of the coolant reflux device of the present invention; Figure 8 is a schematic exploded view of the coolant reflux device of the present invention; Figure 9 is a schematic exploded view of the axle box of the present invention; Label annotations: cylinder body 1, cooling interlayer 11, second fixing hole 12, liquid inlet 13, exhaust port 14, mounting ear 15, cylinder connection ear 16, first connection hole 161, connection bolt 162, cylinder head 2, cooling channel 21, exhaust hole 22, cooling pipe 23, upper cylinder head 24, coolant cavity 241, second gasket 242, lower cylinder head 25, cooling cavity 251, water inlet 252, water outlet 253, third gasket 254, flat cover 26, first gasket 261, flow hole 27, first fixing hole 28, crankcase 3, coolant inlet 31, liquid inlet pipe 32, second connection hole 33, upper shaft case 34, first shaft case connection ear 341, first connection block 342, lower shaft case 35, second shaft case connection ear 351, second connection block 352, fixing bolt 36, spark plug 4, coolant return device 5, cooling kettle 51, coolant cavity 511, return liquid connecting pipe 512, liquid outlet connecting pipe 513, liquid filling port 514, sealing cover 515, mounting block 516, mounting hole 517, overflow exhaust pipe 52, liquid inlet rubber hose 53. Detailed implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1: As Figures 1 to 9A pump-less cooling system for a water pump engine as shown includes an engine cylinder block body 1. A crankcase 3 is fixed to the cylinder block body 1. A cylinder head 2 is provided at the top of the cylinder block body 1. A spark plug 4 passes through the middle of the cylinder head 2. A cooling interlayer 11 surrounding the cylinder is provided inside the cylinder wall of the cylinder block body 1. The cylinder head 2 is provided with a number of cooling channels 21 communicating with the cooling interlayer 11. An exhaust hole 22 communicating with the cooling channels 21 is provided on the end face of the cylinder head 2 away from the cylinder. The crankcase 3 is provided with a coolant inlet 31 communicating with the cooling interlayer 11. The cylinder head 2 is also provided with a cooling pipe 23 horizontally penetrating the cylinder head 2. When the engine starts, it can be cooled by the coolant in the cooling interlayer 11 circumferentially arranged on the cylinder block body 1. Compared with the prior art where external water pumped by a water pump circulates among the cylinder, the cylinder head 2 and the water pump, by providing a cooling interlayer 11 in the engine cylinder, a coolant inlet 31 for filling the interlayer with liquid in the crankcase 3, a number of cooling channels 21 circumferentially arranged on the cylinder head 2 and an exhaust hole 22 for discharging coolant gas at the top, and at the same time providing a cooling pipe 23 on the cylinder head 2, during the operation of the water pump, after the pumped water is shunted, the shunted part passes through the cooling pipe 23 and penetrates the cylinder head 2, which can not only cool the cylinder but also cool the coolant, achieving the effect of multi-stage cooling of the engine, maintaining the temperature of the water pump engine during operation, and effectively avoiding damage problems caused by overheating of the engine.

[0030] As Figure 6 The cylinder head 2 as shown is divided into three parts. The cooling channels 21 are distributed on the upper cylinder head 24 and the lower cylinder head 25. The coolant in the cooling interlayer 11 passes through the cooling channels 21 to the lower side of the flat head 26. When the coolant cools the cylinder surface, it will transfer heat to the cylinder head 2. The external water pumped by the water pump during operation enters the cooling cavity 251 through the water inlet 252, and then flows back to the water pump through the water outlet 253. Since the cooling cavity 251 is annularly arranged on the periphery of the spark plug 4 and occupies a relatively large area of the lower cylinder head 25, it can hold more external water, so the cooling capacity for the cylinder head 2 is stronger. At the same time, since the cooling channels 21 are circumferentially arranged between the cooling cavity 251 and the cylinder head 2, the flowing water in the cooling cavity 251 will cool the coolant, reducing the evaporation efficiency of the coolant, preventing excessive coolant vapor from accumulating in the cooling interlayer 11, and improving the stability of the cylinder.

[0031] A coolant chamber 241 is provided on the end face of the upper cylinder head 24 away from the lower cylinder head 25. The coolant chamber 241 is communicated with the cooling channel 21 and the exhaust hole 22. 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 254 is provided at the connection between the lower cylinder head 25 and the cylinder. Flow holes 27 are provided in the first gasket 261, the second gasket 242 and the third gasket 254. A plurality of first fixing holes 28 are provided in the cylinder head 2 along the axial direction. A plurality of second fixing holes 12 linked with the first fixing holes 28 are provided on the circumferential surface at the connection between the cylinder block 1 and the cylinder head 2. The coolant chamber 241 can accommodate both coolant and coolant vapor, so as to discharge the coolant vapor through the exhaust hole 22, avoid the accumulation of coolant vapor in the cylinder, and improve the circulation ability of the coolant. The first gasket 261, the second gasket 242 and the third gasket 254 at the connections of various parts of the cylinder head 2 can improve the overall sealing performance of the cylinder head 2, prevent the coolant from flowing out of the gap and causing coolant leakage. The flow holes 27 can improve the fluidity of the coolant. At the same time, the first fixing holes 28 provided in the cylinder head 2 along the axial direction penetrate through the flat cover 26, the upper cylinder head 24 and the lower cylinder head 25, and the second fixing holes 12 linked with the cylinder 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.

[0032] Embodiment 2: The difference from Embodiment 1 is that, as Figures 1 to 3 , Figure 7 , Figure 8 shown, the cylinder is linked with a coolant reflux device 5. One end of the coolant reflux device 5 is clamped with the exhaust hole 22, and the other end is clamped with the coolant inlet 31. The coolant reflux device 5 connects one end of the overflow exhaust pipe 52 to the exhaust hole 22 and the other end is sleeved with the liquid return connecting pipe 512 of the cooling pot 51, which can not only reflux the excess coolant into the cooling pot 51, but also gradually condense the coolant vapor generated by the engine operation into coolant through the overflow exhaust pipe 52 and reflux it into the coolant cavity 511 in the cooling pot 51. The liquid inlet rubber pipe 53 is communicated with the coolant inlet 31 through the liquid outlet connecting pipe 513. The condensed coolant is replenished into the cooling sandwich 11 again through the liquid inlet rubber pipe 53, realizing the circulating flow of the coolant among the cooling sandwich 11, the cooling channel 21 and the cooling pot 51.

[0033] When the coolant in the cylinder is insufficient, remove the sealing cover 515 on the liquid filling port 514 to fill the cooling kettle 51. Then, the cooling kettle 51 replenishes the cooling sandwich layer 11 through the liquid inlet rubber hose 53, simplifying the complexity of replenishing the cylinder coolant. At the same time, the sealing cover 515 can prevent the coolant in the cooling kettle 51 from leaking. Meanwhile, several mounting blocks 516 provided on the outer periphery of the cooling kettle 51 can provide multiple support and fixing points for the cooling kettle 51, and it can be fixed at different positions through the mounting holes 517, improving the installation convenience of the coolant return device 5.

[0034] Embodiment 3: The difference from Embodiment 2 is that, as Figure 1 , Figure 2 , Figure 9 shown, the crankcase 3 is also provided with a liquid inlet pipe 32 at the coolant inlet 31. The cylinder block 1 is provided with a liquid inlet 13 at the liquid inlet pipe 32. The coolant sandwich layer is connected to the liquid inlet pipe 32 through the liquid inlet 13. The liquid in the liquid inlet pipe 32 can increase the coolant content in the cooling sandwich layer 11 on the engine cylinder, improving the cooling capacity of the cooling sandwich layer 11 for the engine. At the same time, the cooling sandwich layer 11 realizes the connection between the coolant inlet 31 and the cooling sandwich layer 11 through the liquid inlet 13, facilitating the effective circulation and utilization of the coolant, further enhancing the overall performance of the cooling system and the service life of the engine.

[0035] At the same time, the cylinder is provided with an obliquely arranged exhaust port 14. A number of exhaust port mounting ears 15 are arranged at intervals in the circumferential direction of the exhaust port 14. A number of cylinder connection ears 16 are provided at the connection between the cylinder and the crankcase 3. A first connection hole 161 is opened in the middle of the cylinder connection ear 16. A number of second connection holes 33 linked to the first connection hole 161 are opened at the connection between the crankcase 3 and the cylinder. A connecting bolt is passed through the first connection hole 161 and the second connection hole 33. The obliquely arranged exhaust port 14 can more efficiently guide the combustion exhaust gas out, reducing the residue of the exhaust gas in the cylinder, thereby improving the combustion efficiency. The design of the mounting ears 15 in the circumferential direction of the exhaust port 14 provides the possibility of multi-point fixation, enhancing the structural strength of the exhaust port 14 and ensuring its stability in a high-temperature and high-pressure environment. In addition, the design of the cylinder connection ears 16 and the connecting bolts at the connection between the cylinder and the crankcase 3 ensures the tight connection between the cylinder and the crankcase 3 through multi-point fixation, while improving the stability and sealing performance of the entire system, optimizing the exhaust path of the combustion exhaust gas, and further enhancing the operating efficiency of the engine.

[0036] Moreover, the crankcase 3 is divided into an upper crankcase 34 and a lower crankcase 35, making the installation and maintenance of the crankcase 3 more convenient. At the same time, through the mutual cooperation of the first crankcase connecting ear 341 and the second crankcase connecting ear 351, as well as the first connecting block 342 and the second connecting block 343, the overall strength and sealing performance of the crankcase 3 are further enhanced. The use of the crankcase fixing bolt 36 ensures the tight connection between the upper crankcase 34 and the lower crankcase 35. The liquid inlet channel and the coolant inlet 31 are both arranged on the upper crankcase 34, which not only ensures the stability of the crankcase 3, but also provides a reliable structural support for the coolant circulation, ensuring the efficient operation of the cooling system and providing guarantee for the long-term stable operation of the engine.

[0037] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A pumpless cooling system for a water pump engine, comprising an engine cylinder body, a crankcase fixed to the cylinder body, a cylinder head disposed on the top of the cylinder body, a spark plug penetrated in the middle of the cylinder head, characterized in that: The cylinder body is provided with a cooling interlayer arranged around the cylinder body in the cylinder wall, the cylinder head is provided with a plurality of cooling channels connected to the cooling interlayer, an exhaust hole connected to the cooling channel is provided on the end surface of the cylinder head away from the cylinder, the crankcase is provided with a coolant inlet connected to the cooling interlayer, and the cylinder head is also provided with a cooling pipe that passes through the cylinder head horizontally.

2. The pumpless cooling system for a water pump engine according to claim 1, characterized in that: 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 surface of the flat head. A cooling cavity for cooling water to flow is opened in the middle of the lower cylinder head. A water inlet for cooling water to enter and a water outlet for cooling water to flow out are arranged on the circumferential surface of the lower cylinder head. The water inlet and the water outlet are connected to the cooling cavity.

3. The pumpless cooling system for a water pump engine according to claim 2, characterized in that: A cooling liquid cavity is provided on the end surface of the upper cylinder head away from the lower cylinder head, and the cooling liquid cavity is communicated with the cooling channel and the exhaust hole. 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, and 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 are provided with flow holes. The cylinder head is provided with a plurality of first fixing holes along the axial direction, and a plurality of second fixing holes linked to the first fixing holes are provided on the circumferential surface of the connection between the cylinder and the cylinder head.

4. The pumpless cooling system for a water pump engine according to any one of claims 1 to 3, characterized in that: The cylinder is linked to a coolant reflux device, one end of which is clamped with the exhaust hole and the other end is clamped with the coolant inlet. The coolant reflux device includes a cooling pot, an overflow exhaust pipe connected to the exhaust hole and a liquid inlet hose connected to the coolant inlet. A coolant storage cavity is provided in the middle of the cooling pot. A return liquid connecting pipe and a liquid outlet connecting pipe are provided in the cooling pot connected to the coolant storage cavity. The overflow exhaust pipe is sleeved on the return liquid connecting pipe, and the liquid inlet hose is sleeved on the liquid outlet connecting pipe.

5. The pumpless cooling system for a water pump engine according to claim 4, characterized in that: The cooling pot is provided with a liquid replenishing port on one side of the liquid return connecting pipe, and a sealing cover is threadedly connected to the liquid replenishing port. The outer periphery of the cooling pot is also provided with a plurality of mounting blocks for installing the cooling pot, and the mounting blocks are provided with mounting holes.

6. The pumpless cooling system for a water pump engine according to claim 5, characterized in that: The crankcase is also provided with a liquid inlet pipeline at the coolant inlet, the cylinder body is provided with a liquid inlet port at the liquid inlet pipeline, and the coolant interlayer is communicated with the liquid inlet pipeline through the liquid inlet port.

7. The pumpless cooling system for a water pump engine according to claim 1, characterized in that: The cylinder is provided with an obliquely arranged exhaust port, and the exhaust port is circumferentially provided with a plurality of exhaust port mounting ears arranged at intervals. The connection between the cylinder and the crankcase is provided with a plurality of cylinder connecting ears, and a first connecting hole is provided in the middle of the cylinder connecting ear. The connection between the crankcase and the cylinder is provided with a plurality of second connecting holes linked to the first connecting hole, and connecting bolts are passed through the first connecting hole and the second connecting hole.

8. The pumpless cooling system for a water pump engine according to claim 7, characterized in that: The crankcase is divided into an upper crankcase and a lower crankcase, a plurality of first crankcase connecting ears are arranged on the circumference of the upper crankcase, a plurality of second crankcase connecting ears are arranged on the lower crankcase, a first connecting block and a second connecting block are also arranged at the connection between the upper crankcase and the lower crankcase, and crankcase fixing bolts for fixing the upper crankcase and the lower crankcase are arranged between the first crankcase connecting ear and the second crankcase connecting ear and between the first connecting block and the second connecting block.

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