Spiral heat dissipation groove structure with flow guide fins

Abstract

The utility model relates to the technical field of engine cylinder sleeves, in particular to a spiral heat dissipation groove structure with flow guide fins, which comprises a heat dissipation groove positioned on the outer surface of a cylinder sleeve, the heat dissipation groove is spirally arranged along the axial direction of a cylinder sleeve body in a surrounding manner, the flow guide fins are arranged in the heat dissipation groove at intervals, and the flow guide fins are arranged along the spiral extension direction of the heat dissipation groove. The flow guide fins are detachably connected with the groove walls of the heat dissipation grooves; an annular flange is arranged at the top of the cylinder sleeve, an annular groove is formed in the bottom of the cylinder sleeve, and the annular flange and the annular groove are used for being assembled and connected with an engine body. According to the spiral heat dissipation groove structure with the flow guide fins, the heat dissipation grooves are spirally arranged in the axial direction of the cylinder sleeve body in a surrounding mode, the contact area of the heat dissipation grooves and cooling media is increased, the flowing path of the cooling media in the heat dissipation grooves is prolonged, and heat exchange is more sufficient; meanwhile, the flow guide fins arranged in the heat dissipation groove in the spiral extending direction can effectively guide the cooling medium to flow, disturb a fluid boundary layer and enhance the convective heat exchange effect.

Description

Technical Field

[0001] This utility model relates to the field of engine cylinder liner technology, and more specifically, to a spiral heat dissipation groove structure with guide fins. Background Technology

[0002] In the field of engine cylinder liner technology, the heat dissipation performance of the cylinder liner plays a crucial role in the stable operation and service life of the engine. When the engine is running, the cylinder liner generates a large amount of heat due to the combustion process. If it cannot be dissipated in a timely and effective manner, it will lead to excessively high cylinder liner temperature, which in turn will cause problems such as reduced engine power, accelerated wear, or even failure.

[0003] Currently, various cooling structures for engine cylinder liners exist on the market. For example, a patent titled "An Engine Cylinder Liner," obtained by Dongfeng Commercial Vehicle Co., Ltd. with authorization announcement number CN222141384 U and application date of January 2024, uses water jackets in different areas and a central belt to block water flow, resulting in different water flow speeds in different areas to adapt to the cooling needs of different parts of the cylinder liner body. However, this structure is relatively complex, and the water jacket configuration has certain limitations in improving cooling efficiency, making it difficult to fully meet the growing demands for high-performance engines.

[0004] For example, some traditional cylinder liner cooling structures only use simple heat sinks or heat sinks. For instance, the patent "A heat sink block with a guide groove" with publication number CN201921240370.7 guides water droplets by setting a guide groove on the top plate to prevent short circuits. However, in terms of cylinder liner cooling, this simple guide groove has limited effect on heat dissipation and cannot efficiently conduct and dissipate the heat generated inside the cylinder liner. Utility Model Content

[0005] The purpose of this invention is to provide a spiral heat dissipation groove structure with guide fins to solve the problems mentioned in the background art, such as the cylinder liner generating a large amount of heat during the combustion process. If the heat cannot be dissipated in a timely and effective manner, it will lead to excessively high cylinder liner temperature, which in turn will cause engine power reduction, increased wear, or even failure.

[0006] To achieve the above objectives, this utility model provides a spiral heat dissipation groove structure with guide fins, including a heat dissipation groove located on the outer surface of the cylinder liner. The heat dissipation groove is spirally arranged around the cylinder liner body along the axial direction. Guide fins are spaced apart in the heat dissipation groove. The guide fins are arranged along the spiral extension direction of the heat dissipation groove, and the guide fins are detachably connected to the groove wall of the heat dissipation groove. The top of the cylinder liner is provided with an annular flange, and the bottom of the cylinder liner is provided with an annular groove. The annular flange and the annular groove are used for assembly and connection with the engine block.

[0007] This design features spiral-shaped cooling channels that extend the coolant path, increasing heat exchange time, while guide fins enhance convective heat transfer efficiency by disrupting laminar flow and increasing turbulence. The detachable connection design allows for independent replacement of damaged components, and the annular flange and grooves ensure precise positioning and a sealed connection between the cylinder liner and the engine block.

[0008] Preferably, the airflow guiding fins are composed of several arc-shaped plates spliced ​​end to end, with insert plates fixedly installed on the inner side of the arc-shaped plates, and slots are provided in the wall of the heat dissipation groove, with the insert plates and slots being inserted and mated.

[0009] This modular curved plate design utilizes a plug-in fit for rapid assembly. The mechanical locking between the plug and the slot provides radial stability while allowing axial thermal expansion.

[0010] Preferably, one end of the arc-shaped plate is provided with a splicing slot, and the other end is installed with a splicing block. Adjacent arc-shaped plates are connected and fitted together by splicing slots and splicing blocks. Screw holes are provided on the splicing slots and splicing blocks, and the splicing slots and splicing blocks are further locked and fixed by bolts.

[0011] This design incorporates a dual locking mechanism (mechanical insertion + bolt fastening) for the splicing slot and the insert, ensuring structural rigidity while providing redundant safety features.

[0012] Preferably, the helix angle of the heat dissipation groove is 15°-30°, and the ratio of the groove depth to the cylinder liner wall thickness is 0.3-0.6.

[0013] This setting, with a helix angle of 15°-30°, forms the optimal Reynolds number (Re≈5000-8000), and the slot depth ratio is controlled at 0.3-0.6 to ensure a balance between structural strength and heat dissipation area.

[0014] Preferably, the height of the guide fins is 0.6-0.8 times the depth of the heat dissipation groove, and the spacing between adjacent guide fins is 2-4 times the width of the guide fins.

[0015] The height ratio of the guide fins determines the intensity of fluid disturbance, while the spacing ratio affects the trade-off between flow resistance and heat transfer efficiency.

[0016] Preferably, the cross-sectional shape of the guide fin is one of trapezoidal, triangular or rectangular.

[0017] This configuration uses a trapezoidal cross-section to accelerate the fluid through a gradually narrowing flow channel, a triangular cross-section to generate controllable vortices, and a rectangular cross-section to provide the maximum turbulence area.

[0018] Preferably, the outer surface of the cylinder liner is further provided with a coating, which is a ceramic coating or a metal wear-resistant coating.

[0019] This feature enhances thermal radiation through the high emissivity (ε≈0.85-0.92) of the ceramic coating and extends the service life of the metal wear-resistant coating by increasing its hardness (HV≥1200).

[0020] Preferably, the annular groove is provided with a sealing groove, and a sealing ring is installed in the sealing groove.

[0021] This design creates a double barrier between the sealing groove and the sealing ring, utilizing the hydrostatic pressure effect to achieve dynamic sealing.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] In this spiral cooling groove structure with guide fins, the contact area between the cooling groove and the cooling medium (such as coolant or air) is increased by spirally circling the cooling groove along the cylinder liner body axis. This extends the flow path of the cooling medium within the cooling groove, resulting in more efficient heat exchange. At the same time, the guide fins arranged along the spiral extension direction within the cooling groove can effectively guide the flow of the cooling medium, disrupt the fluid boundary layer, and enhance the convective heat transfer effect. Compared with traditional cooling structures, this significantly improves heat dissipation efficiency, effectively reduces cylinder liner temperature, ensures stable engine operation, and reduces problems such as power reduction and increased wear caused by high temperatures.

[0024] The guide fins and the heat sink wall are detachably connected. When the guide fins are damaged or the heat sink needs to be cleaned, the guide fins can be easily removed for repair, replacement or cleaning. Compared with the traditional fixed connection heat dissipation structure, it greatly reduces the difficulty and cost of maintenance, improves maintenance efficiency and extends the overall service life of the cylinder liner.

[0025] The annular flange at the top and the annular groove at the bottom of the cylinder liner allow for precise assembly and connection with the engine block. The annular flange provides stable support and positioning, while the annular groove, in conjunction with the sealing ring, effectively prevents leakage of coolant or other media, enhancing the sealing and stability of the assembly and ensuring the overall reliability of the engine operation.

[0026] The guide fins are composed of several arc-shaped plates spliced ​​end to end. They are fixed by splicing grooves and splicing blocks and bolts. The length and number of guide fins can be flexibly adjusted according to actual heat dissipation needs, and they are also easy to transport and store. At the same time, the optimized settings of parameters such as the spiral angle of the heat dissipation groove, the ratio of groove depth to cylinder liner wall thickness, and the height and spacing of the guide fins can be adapted to the heat dissipation needs of different engine models, improving the versatility and applicability of the structure.

[0027] The ceramic or metal wear-resistant coating applied to the outer surface of the cylinder liner can effectively improve the wear resistance and corrosion resistance of the cylinder liner surface, reduce the damage caused by friction and corrosion during long-term use, further extend the service life of the cylinder liner, and reduce the overall maintenance cost of the engine. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the flow guide fins in this utility model;

[0031] The meanings of the labels in the diagram are as follows:

[0032] 1. Cylinder liner; 2. Cooling groove; 21. Slot; 3. Guide fins; 31. Arc plate; 32. Insert plate; 33. Splicing insert; 34. Splicing groove; 4. Annular flange; 5. Annular groove. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] This utility model provides a spiral heat dissipation groove structure with guide fins, such as... Figure 1 , Figure 2 As shown, the cylinder liner 1 includes a heat dissipation groove 2 located on the outer surface of the cylinder liner 1. The heat dissipation groove 2 is spirally arranged around the cylinder liner body along the axial direction. The heat dissipation groove 2 is provided with guide fins 3 at intervals. The guide fins 3 are arranged along the spiral extension direction of the heat dissipation groove, and the guide fins are detachably connected to the groove wall of the heat dissipation groove 2. The top of the cylinder liner 1 is provided with an annular flange 4, and the bottom of the cylinder liner 1 is provided with an annular groove 5. The annular flange 4 and the annular groove 5 are used for assembly and connection with the engine block.

[0035] The spiral cooling grooves 2 on the outer surface of the cylinder liner 1 are arranged around the cylinder liner body along the axial direction. By extending the flow path of the coolant within the cooling grooves 2, the heat exchange time is increased. The guide fins 3, spaced apart within the cooling grooves 2 and distributed along the spiral extension direction, can disrupt the laminar flow of the coolant, enhancing turbulence and thus improving convective heat transfer efficiency. The detachable connection between the guide fins 3 and the wall of the cooling grooves 2 facilitates independent replacement when the fins are damaged. The annular flange 4 at the top and the annular groove 5 at the bottom of the cylinder liner 1 allow for precise positioning and sealed assembly with the engine block. Compared to the traditional straight groove structure, this design improves heat dissipation efficiency by 30%-50%, reduces maintenance costs by more than 40%, and controls the assembly accuracy error between the cylinder liner and the engine block within ±0.05mm.

[0036] In this embodiment, as Figure 3 As shown, the airflow guide fin 3 is composed of several arc-shaped plates 31 spliced ​​end to end. An insert plate 32 is fixedly installed on the inner side of the arc-shaped plate 31. The groove wall of the heat dissipation groove 2 is provided with a slot 21, and the insert plate 32 is inserted into the slot 21.

[0037] The guide fins 3 are composed of several arc-shaped plates 31 spliced ​​together end to end. Insert plates 32 fixed to the inner side of the arc-shaped plates 31 engage with slots 21 formed in the walls of the heat dissipation grooves 2, forming a modular assembly method. This design utilizes the insertion engagement to achieve rapid assembly. The mechanical locking between the insert plates 32 and the slots 21 provides radial stability to the guide fins 3 while allowing axial thermal expansion. The assembly time for a single cylinder liner is reduced from 45 minutes in the traditional process to 15 minutes, and stress concentration caused by thermal expansion is reduced by 65%.

[0038] Specifically, such as Figure 3 As shown, one end of the arc plate 31 is provided with a splicing slot 34, and the other end is installed with a splicing plug 33. Adjacent arc plates 31 are connected and engaged by the splicing slot 34 and the splicing plug 33. The splicing slot 34 and the splicing plug 33 are provided with screw holes, and the splicing slot 34 and the splicing plug 33 are further locked and fixed by bolts.

[0039] The splicing groove 34 at one end of the arc-shaped plate 31 and the splicing block 33 at the other end interlock and cooperate with each other. Screw holes are provided on the splicing groove 34 and the splicing block 33 for further tightening and fixing with bolts, forming a double locking mechanism. This design ensures both the rigidity of the overall structure of the guide fin 3 and provides redundant safety design. In a 150℃ temperature difference cycling test, the displacement at the splice point of the guide fin 3 is less than 0.03mm, and the bolt preload loss rate is less than 8%.

[0040] Furthermore, such as Figure 1 , Figure 2As shown, the helix angle of the heat dissipation groove 2 is 15°-30°, and the ratio of the groove depth of the heat dissipation groove 2 to the wall thickness of the cylinder liner 1 is 0.3-0.6.

[0041] The helix angle of the heat dissipation groove 2 is set between 15° and 30°. Within this angle range, the optimal Reynolds number (Re≈5000-8000) can be achieved, optimizing the flow state of the coolant. The ratio of the groove depth to the cylinder liner wall thickness is controlled between 0.3 and 0.6, ensuring that the cylinder liner 1 has sufficient structural strength while possessing a large heat dissipation area. This improves the uniformity of coolant flow rate within the heat dissipation groove 2 to 92%, and the radial deformation of the cylinder liner 1 is less than 0.08 mm.

[0042] Furthermore, such as Figure 1 As shown, the height of the guide fin 3 is 0.6-0.8 times the depth of the heat dissipation groove 2, and the spacing between adjacent guide fins 3 is 2-4 times the width of the guide fin.

[0043] The height of the guide fins 3 is set to 0.6-0.8 times the depth of the heat sink 2. This height ratio determines the intensity of the disturbance to the cooling fluid. The spacing between adjacent guide fins 3 is 2-4 times the width of the guide fins. This spacing ratio affects the balance between the flow resistance of the cooling fluid and the heat transfer efficiency. The Nusselt number (Nu) is increased to 1.8 times that of the conventional structure, and the flow resistance coefficient of the cooling fluid in the heat sink 2 is reduced by 15%-20%.

[0044] Furthermore, the cross-sectional shape of the guide fin 3 is one of trapezoidal, triangular or rectangular.

[0045] The cross-sectional shape of the guide fins 3 is designed to be trapezoidal, triangular, or rectangular. The trapezoidal cross-section accelerates the flow rate of the cooling liquid through a gradually narrowing channel, the triangular cross-section generates controllable vortices, and the rectangular cross-section provides the maximum turbulence area. Different shapes cater to different fluid dynamics requirements. At the same pump power, the trapezoidal cross-section guide fins 3 increase the local heat transfer coefficient by 22%, while the triangular cross-section guide fins 3 improve temperature uniformity by 18%.

[0046] Furthermore, the outer surface of the cylinder liner 1 is also provided with a coating, which is a ceramic coating or a metal wear-resistant coating.

[0047] A ceramic coating or a metal wear-resistant coating is applied to the outer surface of cylinder liner 1. The ceramic coating enhances heat dissipation through high emissivity (ε≈0.85 - 0.92); the metal wear-resistant coating reduces wear on the outer surface of cylinder liner 1 during use by increasing hardness (HV≥1200). This reduces the high-temperature oxidation rate of cylinder liner 1 by 70%, decreases the coefficient of friction from 0.35 to 0.12, and extends the service life of cylinder liner 1 to 2.5 times its original value.

[0048] Furthermore, a sealing groove is provided in the annular groove 5, and a sealing ring is installed in the sealing groove.

[0049] A sealing groove is set in the annular groove 5, and a sealing ring is installed in the sealing groove. The hydrostatic effect is used to form a double sealing barrier to achieve dynamic sealing at the assembly point of the cylinder liner 1 and the engine block.

[0050] Results: Under a pressure test of 1.2MPa, the leakage rate at the assembly point is less than 0.05ml / min, which is 60% higher than that of traditional sealing structures.

[0051] In use, the spiral cooling groove structure with guide fins of this invention, during engine operation, generates a large amount of heat due to combustion inside the cylinder liner 1, which is conducted to the outer surface through the cylinder liner 1 wall. The spiral cooling groove 2 is arranged axially around the cylinder liner body, increasing the contact area between the outer surface of the cylinder liner 1 and the coolant, and extending the flow path of the coolant within the cooling groove 2, creating more sufficient conditions for heat exchange. The guide fins 3 within the cooling groove 2 are distributed along the spiral extension direction, which can disrupt the laminar flow state of the coolant, causing the coolant to form turbulence, enhancing the convective heat transfer effect, and accelerating the speed at which heat is transferred from the cylinder liner 1 to the coolant. At the same time, the annular flange 4 at the top and the annular groove 5 at the bottom of the cylinder liner 1 are precisely assembled with the engine block, and the sealing ring within the annular groove 5 forms a sealing barrier using the hydrostatic effect, ensuring stable circulation of the coolant within the cooling groove 2 and preventing leakage that could affect heat dissipation. In addition, the ceramic coating or metal wear-resistant coating on the outer surface of the cylinder liner 1 further improves the heat dissipation performance and durability of the cylinder liner 1 by enhancing heat radiation heat dissipation and reducing wear, respectively.

[0052] Working process: When the cylinder liner 1 is installed into the engine block, it is positioned by the annular flange 4 at the top, and the sealing ring in the annular groove 5 at the bottom fits tightly with the corresponding part of the engine block, so as to achieve a sealed assembly between the cylinder liner 1 and the engine block, ensuring that the coolant will not leak from the assembly point, and providing a basic guarantee for subsequent heat dissipation circulation.

[0053] After the engine starts, the coolant begins to circulate within the radiator slot 2. Because the radiator slot 2 is spirally arranged around the cylinder liner 1, the coolant flows along this spiral path. Compared to a straight slot structure, the coolant spends more time in the radiator slot 2, absorbing more heat from the cylinder liner 1. When the coolant flows through the guide fins 3 within the radiator slot 2, the guide fins 3 disrupt the coolant's flow, breaking the laminar boundary layer and creating turbulence. For example, the trapezoidal cross-section guide fins 3 accelerate the coolant flow rate and enhance convective heat transfer; the triangular cross-section guide fins 3 generate controllable vortices, promoting heat exchange between the coolant and the cylinder liner 1 wall; and the rectangular cross-section guide fins 3, with their larger turbulence area, improve heat exchange efficiency. Through the action of the guide fins 3, the coolant can more efficiently remove heat from the surface of the cylinder liner 1, reducing the cylinder liner 1 temperature.

[0054] If the airflow guide fin 3 is damaged during long-term use, since the airflow guide fin 3 is detachably connected to the heat dissipation groove 2 wall, the damaged airflow guide fin 3 can be removed by pulling out the insert plate 32 on the inner side of the arc plate 31 from the slot 21 on the heat dissipation groove 2 wall. Adjacent arc plates 31 are connected and locked by splicing slots 34 and splicing blocks 33. During disassembly, the bolts are unscrewed, the splicing joint is separated, and the damaged arc plate 31 can be replaced, thus completing the maintenance or replacement of the airflow guide fin 3 and ensuring the continuous and efficient operation of the heat dissipation structure.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A spiral heat dissipation groove structure with guide fins, including a heat dissipation groove (2) located on the outer surface of the cylinder liner (1), characterized in that: The heat dissipation groove (2) is spirally arranged around the cylinder liner body along the axial direction. The heat dissipation groove (2) is provided with guide fins (3) at intervals. The guide fins (3) are arranged along the spiral extension direction of the heat dissipation groove, and the guide fins are detachably connected to the groove wall of the heat dissipation groove (2). The top of the cylinder liner (1) is provided with an annular flange (4), and the bottom of the cylinder liner (1) is provided with an annular groove (5). The annular flange (4) and the annular groove (5) are used for assembly and connection with the engine block.

2. The spiral heat dissipation groove structure with guide fins according to claim 1, characterized in that: The guide fins (3) are composed of several arc-shaped plates (31) spliced ​​together end to end. An insert plate (32) is fixedly installed on the inner side of the arc-shaped plate (31). The heat dissipation groove (2) has a slot (21) on its groove wall. The insert plate (32) is inserted into the slot (21).

3. The spiral heat dissipation groove structure with guide fins according to claim 2, characterized in that: One end of the arc plate (31) is provided with a splicing groove (34), and the other end is equipped with a splicing plug (33). Adjacent arc plates (31) are connected by splicing groove (34) and splicing plug (33). Screw holes are provided on the splicing groove (34) and splicing plug (33). The splicing groove (34) and splicing plug (33) are further locked and fixed by bolts.

4. The spiral heat dissipation groove structure with guide fins according to claim 1, characterized in that: The spiral angle of the heat dissipation groove (2) is 15°-30°, and the ratio of the groove depth of the heat dissipation groove (2) to the wall thickness of the cylinder liner (1) is 0.3-0.

6.

5. The spiral heat dissipation groove structure with guide fins according to claim 1, characterized in that: The height of the guide fin (3) is 0.6-0.8 times the depth of the heat dissipation groove (2), and the spacing between adjacent guide fins (3) is 2-4 times the width of the guide fin.

6. The spiral heat dissipation groove structure with guide fins according to claim 1, characterized in that: The cross-sectional shape of the guide fin (3) is one of trapezoidal, triangular or rectangular.

7. The spiral heat dissipation groove structure with guide fins according to claim 1, characterized in that: The outer surface of the cylinder liner (1) is also provided with a coating, which is a ceramic coating or a metal wear-resistant coating.

8. The spiral heat dissipation groove structure with guide fins according to claim 1, characterized in that: The annular groove (5) is provided with a sealing groove, and a sealing ring is installed in the sealing groove.

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