A diesel engine high-efficiency heat dissipation cylinder block and processing method thereof

Abstract

The present invention provides a diesel engine high-efficiency heat dissipation cylinder block and a processing method thereof, belonging to the technical field of diesel engine cylinders, comprising a cylinder block, a combustion chamber is provided at the center of the cylinder block, and a plurality of heat dissipation channels and heat conduction channels are provided on the cylinder block; the heat dissipation channels and the heat conduction channels are regularly arranged around the combustion chamber; wherein the axis of the heat conduction channel is perpendicular to the generatrix of the combustion chamber; the heat dissipation channel is located between the upper and lower layers of heat conduction channels; the heat dissipation channel is a square through hole, and the heat dissipation channel runs through two opposite sides of the cylinder block; a rectangular array of heat conduction channels is arranged on the remaining two opposite sides of the cylinder block, and the heat conduction channel is perpendicular to the heat dissipation channel.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engine cylinders, and in particular relates to a diesel engine high-efficiency heat dissipation cylinder block and a processing method thereof. Background Art

[0002] With the development of the low-altitude economy, drones are increasingly being used in firefighting, plant protection, logistics, and other fields. Compared to electric drones, fuel-powered drones offer longer flight times and higher payloads. Diesel-powered drones, due to their superior performance, hold a significant market share. Compared to other transportation vehicles, diesel engines for drones have higher requirements, requiring them to be compact and lightweight, and, in particular, to provide superior heat dissipation.

[0003] There are two common cooling methods for diesel engines: air cooling and water cooling.

[0004] The working principle of engine air cooling is to use air as a cooling medium to conduct the heat generated by the engine through the radiator fins on the outer wall of the cylinder and cylinder head, and then blow the air over the surface of the radiator fins at high speed to take away the heat, thereby cooling the engine; water cooling uses water (or antifreeze) as a cooling medium to take away the heat of the engine's high-temperature parts to ensure the normal operating temperature of the engine.

[0005] Whether air-cooled or water-cooled, the high temperature generated by the engine combustion chamber is conducted out through the metal (usually aluminum alloy) on the outer wall of the cylinder. Therefore, the thermal conductivity of the cylinder body is the key to determining the heat dissipation effect.

[0006] An analysis of the existing UAV cylinder cooling technology reveals the following problems:

[0007] Problem 1: The UAV cylinder body utilizes a single metal structure (typically aluminum alloy), with solid metal walls. When the engine is operating, the high temperatures generated by combustion are conducted through the metal, transferring heat from the combustion chamber's inner wall to the heat sink on the cylinder liner's exterior. Due to its bulk, this single metal structure naturally has high thermal resistance, resulting in poor overall heat conduction and ineffective heat dissipation from the cylinder body.

[0008] Problem 2: The drone's cylinder body utilizes a composite structure, with heat pipes connecting the cylinder's outer wall to the heat sink. The high temperature generated by diesel combustion is first transferred to the cylinder's outer wall, and then to the heat sink via dozens or even hundreds of heat pipes. The complex structure of the heat pipe composite structure, with its numerous pipes, makes installation difficult. Furthermore, the presence of multiple pipes reduces the overall structural strength and makes it susceptible to damage. Summary of the Invention

[0009] In view of this, the present invention proposes a diesel engine high-efficiency heat dissipation cylinder block and a processing method thereof, which can solve the problems of low overall structural strength, complex installation and poor heat dissipation effect of the existing UAV diesel engine cylinder block.

[0010] The present invention is implemented as follows: The present invention provides a diesel engine high-efficiency heat dissipation cylinder block, comprising a cylinder block, wherein a combustion chamber is provided at the center of the cylinder block, and a plurality of heat dissipation channels and heat conduction channels are provided on the cylinder block; the heat dissipation channels and the heat conduction channels are regularly arranged outside the combustion chamber; wherein the axis of the heat conduction channel is perpendicular to the busbar of the combustion chamber; and the heat dissipation channel is located between the upper and lower layers of the heat conduction channels.

[0011] On the basis of the above technical solution, the diesel engine high-efficiency heat dissipation cylinder block of the present invention can also be improved as follows:

[0012] Furthermore, the heat dissipation channel is a square through hole, and the heat dissipation channel runs through two opposite sides of the cylinder body; the rectangular array of heat conduction channels is arranged on the remaining two opposite sides of the cylinder body, and the heat conduction channels are perpendicular to the heat dissipation channels.

[0013] The beneficial effect of adopting the above further scheme is: by setting opposite through holes, the drone can use natural wind to dissipate heat from the cylinder during flight. During the flight of the drone, natural wind passes through the heat dissipation channel and takes away the heat transferred by the heat conduction channel.

[0014] Furthermore, the heat dissipation channel is a square through hole, and the heat dissipation channel passes through two opposite sides of the cylinder body; the circumferential array of the heat conduction channels is arranged outside the combustion chamber.

[0015] The beneficial effect of adopting the above further scheme is: by arranging the heat conduction channels circumferentially around the combustion chamber, the heat can be better brought to the four side walls of the cylinder body. Compared with only arranging the heat conduction channels on two opposite side walls, the surrounding arrangement can more effectively achieve heat dissipation.

[0016] Furthermore, auxiliary heat dissipation channels are provided on both sides of the cylinder body where the heat dissipation channel is provided; the auxiliary heat dissipation channel is located between the two heat dissipation channels on the same layer; and the heat dissipation channel and the auxiliary heat dissipation channel are connected inside the cylinder body.

[0017] The beneficial effects of adopting the above further solution are: by providing an auxiliary heat dissipation channel, the air intake volume is increased, thereby increasing the wind speed of natural wind in the cylinder body, and utilizing the high wind speed to achieve improved heat dissipation efficiency.

[0018] Furthermore, the heat dissipation channel is a circular hole pipe, which is arranged around the outer periphery of the combustion chamber, and the inlet and outlet of the heat dissipation channel are located on the same side wall of the cylinder; the rectangular array of heat conduction channels is arranged on two opposite sides of the cylinder.

[0019] The beneficial effect of adopting the above further solution is: by setting up a surrounding heat dissipation channel, using circulating equipment and cooling medium, no longer relying on natural wind, the applicability of the device is improved.

[0020] Furthermore, the heat dissipation channel is a circular hole pipeline, and the heat dissipation channel is arranged around the outer periphery of the combustion chamber; and the inlet and outlet of the heat dissipation channel are located on the same side wall of the cylinder body; the circumferential array of the heat conduction channels is arranged around the outer periphery of the combustion chamber.

[0021] The present invention also provides a method for processing a diesel engine high-efficiency heat dissipation cylinder block, wherein the method is used to process and manufacture the above-mentioned diesel engine high-efficiency heat dissipation cylinder block; the specific processing method includes:

[0022] S1 embedded heat pipe structure processing and manufacturing, processing and manufacturing the outer wall part of the heat conduction channel;

[0023] S2 heat dissipation channel processing, opening a channel on the cylinder body to dissipate heat from the cylinder body;

[0024] S3 air tightness test, which tests the air tightness of the combustion chamber and the embedded heat pipe structure to ensure that there is no leakage in the combustion chamber and the heat conduction channel during use;

[0025] S4 embedded heat pipe structure packaging and airtightness testing, the embedded heat pipe structure processed in step 1 is sealed to complete the processing of the heat conduction channel.

[0026] Furthermore, the specific processing and manufacturing method in step S1 includes the following steps:

[0027] S11 uses mechanical equipment to open blind holes on the side wall of the cylinder;

[0028] S12 cleans the cylinder body as a whole to remove burrs, metal chips and oil stains generated during the processing;

[0029] S13 inserts a cylindrical steel core into the blind hole, fixes the steel core in the center of the blind hole using a fixture, then fills the blind hole with aluminum powder and uses vibration to increase the overall mixing density;

[0030] S14 welding seals the blind hole port to prevent aluminum powder from spilling;

[0031] S15 places the cylinder in a continuous heating furnace and heats it at high temperature, and introduces reducing gas to prevent oxidation;

[0032] S16 Cooling, and taking out the central cylindrical steel core.

[0033] Furthermore, the specific processing method in step S4 includes the following steps:

[0034] S41 Place the cylinder body horizontally, with the blind hole opening facing upwards, and use the water injection equipment to fill the blind hole with ultrapure water;

[0035] S42 transfers the cylinder to the sealed cabin of the heat pipe packaging equipment;

[0036] S43 heats the cylinder and uses evaporated ultrapure water to expel the gas in the blind hole;

[0037] S44 uses packaging equipment to evacuate the sealed cabin to maintain low pressure inside the blind hole;

[0038] S45 uses friction welding to seal blind holes.

[0039] Compared with the prior art, the diesel engine high-efficiency heat dissipation cylinder block and processing equipment provided by the present invention have the following beneficial effects:

[0040] (1) High heat dissipation efficiency:

[0041] The embedded heat pipe structure of the present invention can greatly improve the overall heat dissipation efficiency, and the heat generated by engine combustion can be conducted away within a few seconds.

[0042] (2) High mechanical strength:

[0043] The outer shell of the embedded heat pipe structure of the present invention is integrally formed and has high mechanical strength and is impact-resistant and deformation-resistant.

[0044] (3) Long service life and maintenance-free:

[0045] The embedded heat pipe structure of the present invention adopts an integrated structure and can work normally throughout the entire life cycle of the engine without requiring maintenance.

[0046] (4) Small size and light weight:

[0047] The embedded heat pipe structure of the present invention has high heat dissipation efficiency and is therefore small in size and light in weight under the same heat dissipation effect, making it more suitable for diesel drones. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 This is a schematic diagram of the overall structure of the first embodiment;

[0050] Figure 2 It is a vertical overall cross-sectional view of the first embodiment;

[0051] Figure 3 is a cross-sectional view of the heat conduction channel of the first embodiment;

[0052] Figure 4 This is a cross-sectional view of the heat dissipation channel of the first embodiment;

[0053] Figure 5 This is a schematic diagram of the overall structure of the second embodiment;

[0054] Figure 6 is a cross-sectional view of the heat conduction channel of the second embodiment;

[0055] Figure 7 This is a schematic diagram of the overall structure of the third embodiment;

[0056] Figure 8 This is a cross-sectional view of the heat dissipation channel of the third embodiment;

[0057] Figure 9 This is a schematic diagram of the overall structure of the fourth embodiment;

[0058] Figure 10 It is a vertical overall cross-sectional view of the fourth embodiment;

[0059] Figure 11 This is a cross-sectional view of the heat dissipation channel of the fourth embodiment;

[0060] Figure 12 This is a schematic diagram of the overall structure of the fifth embodiment;

[0061] Figure 13 This is a cross-sectional view of the heat dissipation channel of the fifth embodiment;

[0062] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0063] 1. Cylinder body; 11. Combustion chamber; 2. Heat dissipation channel; 3. Heat conduction channel; 4. Auxiliary heat dissipation channel. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0065] like Figure 1-4The figure shows a first embodiment of a high-efficiency heat dissipation cylinder block for a diesel engine according to the present invention, comprising a cylinder block 1. The cylinder block 1 is integrally formed, and a combustion chamber 11 is centrally located therein, providing energy released by diesel combustion. The cylinder block 1 is also provided with a plurality of heat dissipation channels 2 and heat conduction channels 3 for heat transfer. The heat conduction channels 3 are used to conduct the high temperature generated in the combustion chamber to the outer layer of the cylinder block 1, while the heat dissipation channels 2 are used to quickly transfer the temperature of the outer layer of the cylinder block 1 to the outside of the system. The heat dissipation channels 2 and heat conduction channels 3 are regularly arranged around the periphery of the combustion chamber 11. The axis of the heat conduction channel 3 is perpendicular to the busbar of the combustion chamber 11. The heat dissipation channels 2 are located between the upper and lower layers of the heat conduction channels 3.

[0066] Optionally, in the above technical solution, the heat dissipation channel 2 is a square through hole, and the heat dissipation channel 2 passes through two opposite sides of the cylinder body 1; the heat conduction channel 3 is arranged in a rectangular array on the remaining two opposite sides of the cylinder body 1, and the heat conduction channel 3 is perpendicular to the heat dissipation channel 2.

[0067] like Figure 5 、 6 1 is a second embodiment of a high-efficiency heat dissipation cylinder block for a diesel engine provided by the present invention. The difference from the first embodiment is that a circumferential array of heat conduction channels 3 is arranged on the periphery of the combustion chamber 11 .

[0068] like Figure 7 、 8 As shown, the third embodiment of the diesel engine high-efficiency heat dissipation cylinder block provided by the present invention is different from the first embodiment in that auxiliary heat dissipation channels 4 are provided on both sides of the heat dissipation channel 2 provided in the cylinder block 1; the auxiliary heat dissipation channel 4 is located between the two heat dissipation channels 2 on the same layer; and the heat dissipation channel 2 and the auxiliary heat dissipation channel 4 are connected inside the cylinder block 1.

[0069] Optionally, in the above technical solution, when opening the auxiliary heat dissipation channel 4 and connecting it with the heat dissipation channel 2, it is preferred to open a blind hole auxiliary heat dissipation channel 4, and then open a through hole from the other side wall to connect the auxiliary heat dissipation channel 4 with the heat dissipation channel 2, and finally seal the through hole on the other side wall so that the passage is only inside the cylinder body 1.

[0070] like Figure 9-11 As shown, the fourth embodiment of the high-efficiency heat dissipation cylinder block of a diesel engine provided by the present invention is different from the first embodiment in that the heat dissipation channel 2 is a circular hole pipeline, the heat dissipation channel 2 is arranged around the periphery of the combustion chamber 11, and the inlet and outlet of the heat dissipation channel 2 are located on the same side wall of the cylinder block 1.

[0071] like Figure 12 、 13As shown, the fifth embodiment of the present invention provides a high-efficiency heat dissipation cylinder block for a diesel engine. The difference from the fourth embodiment is that the heat conduction channels 3 are arranged in a circular array around the periphery of the combustion chamber 11. Compared with the fourth embodiment, the heat conduction channels 3 are distributed in this embodiment, resulting in a greater distance between the inlet and outlet of the heat dissipation channel 2. The difference from the second embodiment is that the heat dissipation channel 2 is a circular hole pipe, the heat dissipation channel 2 is arranged around the periphery of the combustion chamber 11, and the inlet and outlet of the heat dissipation channel 2 are located on the same side wall of the cylinder block 1.

[0072] Alternatively, in the above technical solution, when creating heat dissipation channel 2, it is preferred to drill through holes around the cylinder body 1. In this case, because the through holes intersect, heat dissipation channel 2 is connected within the cylinder body 1. An opening is reserved as the inlet, and the openings on the other cylinder side walls are sealed. When sealing, it is important to simultaneously block the internal piping. Finally, a new blind hole is drilled on the inlet side to serve as the outlet. The blockage is located between the inlet and outlet, and the new blind hole is connected to the internal piping.

[0073] The present invention also provides a method for processing a diesel engine high-efficiency heat dissipation cylinder block, the specific processing method comprising:

[0074] S1: Processing and manufacturing of the embedded heat pipe structure, processing and manufacturing the outer wall of the heat conduction channel 3;

[0075] S2 heat dissipation channel processing, opening a channel on the cylinder body 1 to dissipate heat from the cylinder body;

[0076] S3 air tightness test, respectively testing the air tightness of the combustion chamber 11 and the embedded heat pipe structure to ensure that the combustion chamber 11 and the heat conduction channel 3 will not leak during use;

[0077] S4: Embedded heat pipe structure packaging and airtightness testing, the embedded heat pipe structure processed in step S1 is sealed, and the processing of the heat conduction channel 3 is completed.

[0078] Optionally, in the above technical solution, the specific processing and manufacturing method in step S1 includes the following steps:

[0079] S11: using mechanical equipment to open a blind hole on the side wall of the cylinder body 1;

[0080] S12 cleans the cylinder body 1 as a whole to remove burrs, metal chips and oil stains generated during the processing;

[0081] S13: inserting a cylindrical steel core into the blind hole, fixing the steel core in the center of the blind hole with a fixing fixture, then adding aluminum powder into the blind hole and using vibration to increase the overall mixed density; after adding aluminum powder, knocking the cylinder 1 to make the aluminum powder vibrate and fall, compacting the aluminum powder with a corresponding mold, and adding aluminum powder again, repeating the above operation three times;

[0082] S14 welding seals the blind hole port to prevent aluminum powder from spilling;

[0083] S15 places the cylinder in a continuous heating furnace and heats it at high temperature, and introduces reducing gas to prevent oxidation;

[0084] S16 Cooling, and taking out the central cylindrical steel core.

[0085] Optionally, in the above technical solution, the specific processing method in step S4 includes the following steps:

[0086] S41 Place the cylinder body 1 horizontally, with the blind hole opening facing upward, and use a water injection device to fill ultrapure water into the blind hole;

[0087] S42 transfers the cylinder to the sealed cabin of the heat pipe packaging equipment;

[0088] S43 heats the cylinder and uses evaporated ultrapure water to expel the gas in the blind hole;

[0089] S44 uses packaging equipment to evacuate the sealed cabin to maintain low pressure inside the blind hole;

[0090] S45 uses friction welding to seal blind holes.

[0091] Specifically, the heat dissipation principle of the present invention is as follows:

[0092] The absorption and release of heat by an object are relative. Whenever there is a temperature difference, heat will inevitably transfer from the higher temperature to the lower temperature. The heat pipe structure uses evaporative cooling to create a large temperature difference between the two ends of the heat pipe, allowing for rapid heat transfer.

[0093] The outer wall of the cylinder's combustion chamber 11 and the outer wall of the embedded heat pipe structure form an integrated structure. The heat generated by the diesel combustion is transferred through the outer wall of the combustion chamber 11 to the heat transfer channel 3 for heating. The interior of the heat transfer channel 3 is in a negative pressure state, and the ultrapure water injected inside will vaporize at around 30 degrees Celsius. As the temperature of the heating section rises, the ultrapure water evaporates, and the vapor pressure is higher than that of the condensing section, forming a pressure differential between the two ends. This pressure differential drives the steam from the heating section to the condensing section, where the steam releases heat and condenses back into liquid.

[0094] The inner wall of heat conduction channel 3 is coated with a capillary porous material formed by sintering aluminum powder. Due to evaporation, a meniscus forms in the capillary pores where the liquid enters the core of the tube in the heating section. This creates a capillary pumping force, and the liquid then flows back to the heating section along the porous material due to the capillary pumping force. This cycle continues, transferring heat from the end of heat conduction channel 3 closest to combustion chamber 11 to the end farther away from combustion chamber 11.

[0095] This cycle is rapid and heat can be conducted out continuously.

[0096] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for processing a diesel engine high-efficiency heat dissipation cylinder block, the high-efficiency heat dissipation cylinder block specifically comprising a cylinder block (1), a combustion chamber (11) being provided at the center of the cylinder block (1), and a plurality of heat dissipation channels (2) and heat conduction channels (3) being provided on the cylinder block (1); the heat dissipation channels (2) and the heat conduction channels (3) being regularly arranged at the periphery of the combustion chamber (11); wherein: The axis of the heat conduction channel (3) is perpendicular to the generatrix of the combustion chamber (11); the heat dissipation channel (2) is located between the upper and lower layers of the heat conduction channel (3); It is characterized in that the specific steps of the processing method are as follows: S1: Processing the embedded heat pipe structure, processing and manufacturing the outer wall portion of the heat conduction channel (3), the specific operation includes using mechanical equipment to open a blind hole on the side wall of the cylinder body (1); Clean the cylinder body (1) as a whole to remove burrs, metal chips and oil stains generated during the processing; Insert a cylindrical steel core into the blind hole, fix the steel core in the center of the blind hole using a fixing fixture, then fill the blind hole with aluminum powder, and use vibration to increase the overall mixed density; Weld and seal the blind hole ports to prevent aluminum powder from spilling; The cylinder is placed in a continuous heating furnace and heated at high temperature, and a reducing gas is introduced to avoid oxidation; Cool and remove the central cylindrical steel core; S2: heat dissipation channel processing, opening a channel on the cylinder body (1) for dissipating heat from the cylinder body; S3: air tightness test, respectively testing the air tightness of the combustion chamber (11) and the embedded heat pipe structure to ensure that the combustion chamber (11) and the heat conduction channel (3) will not leak during use; S4: Packaging and airtightness testing of the embedded heat pipe structure, sealing the embedded heat pipe structure processed in step S1, and completing the processing of the heat conduction channel (3).

2. The method for processing a diesel engine high-efficiency heat dissipation cylinder block according to claim 1, characterized in that: The heat dissipation channel (2) is a square through hole, and the heat dissipation channel (2) passes through two opposite sides of the cylinder body (1); the heat conduction channels (3) are arranged in a rectangular array on the remaining two opposite sides of the cylinder body (1), and the heat conduction channels (3) are perpendicular to the heat dissipation channels (2).

3. The method for processing a diesel engine high-efficiency heat dissipation cylinder block according to claim 1, characterized in that: The heat dissipation channel (2) is a square through hole, and the heat dissipation channel (2) passes through two opposite sides of the cylinder body (1); the heat conduction channels (3) are arranged in a circumferential array on the periphery of the combustion chamber (11).

4. A method for processing a diesel engine high-efficiency heat dissipation cylinder block according to any one of claims 2-3, characterized in that: The cylinder body (1) is provided with auxiliary heat dissipation channels (4) on both sides of the heat dissipation channel (2); the auxiliary heat dissipation channel (4) is located between two heat dissipation channels (2) on the same layer; the heat dissipation channel (2) and the auxiliary heat dissipation channel (4) are connected inside the cylinder body (1).

5. The method for processing a diesel engine high-efficiency heat dissipation cylinder block according to claim 1, characterized in that: The heat dissipation channel (2) is a circular hole pipeline, the heat dissipation channel (2) is arranged around the periphery of the combustion chamber (11), and the inlet and outlet of the heat dissipation channel (2) are located on the same side wall of the cylinder body (1); the heat conduction channels (3) are arranged in a rectangular array on two opposite sides of the cylinder body (1).

6. The method for processing a diesel engine high-efficiency heat dissipation cylinder block according to claim 1, characterized in that: The heat dissipation channel (2) is a circular hole pipeline, and the heat dissipation channel (2) is arranged around the periphery of the combustion chamber (11); the inlet and outlet of the heat dissipation channel (2) are located on the same side wall of the cylinder body (1); and the heat conduction channels (3) are arranged in a circular array around the periphery of the combustion chamber (11).

7. The method for processing a diesel engine high-efficiency heat dissipation cylinder block according to claim 1, characterized in that: The specific processing method in step S4 comprises the following steps: S41: placing the cylinder body (1) horizontally, with the blind hole opening facing upward, and using a water injection device to inject ultrapure water into the blind hole; S42: transferring the cylinder to a sealed cabin of a heat pipe packaging device; S43: Heating the cylinder and using evaporated ultrapure water to discharge the gas in the blind hole; S44: Using packaging equipment to evacuate the sealed cabin to a vacuum, so that the inside of the blind hole maintains a low pressure; S45: Sealing blind holes by friction welding.

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