Efficient heat dissipation cylinder body of diesel engine and machining method of efficient heat dissipation cylinder body

Abstract

The invention provides a diesel engine efficient heat dissipation cylinder body and a machining method thereof, and belongs to the technical field of diesel engine air cylinders. The diesel engine efficient heat dissipation cylinder body comprises a cylinder body, a combustion chamber is formed in the center of the cylinder body, and a plurality of heat dissipation channels and heat conduction channels are formed in the cylinder body; the heat dissipation channels and the heat conduction channels are regularly arranged on the periphery of the combustion chamber. 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 heat conduction channels; the heat dissipation channel is a square through hole and penetrates through the two opposite sides of the cylinder body. The rectangular array of the heat conduction channels is arranged in the remaining two opposite sides of the cylinder body, and the heat conduction channels are perpendicular to the heat dissipation channels.

Description

Technical Field

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

[0002] With the development of low-altitude economy, drones are increasingly used in firefighting, plant protection, logistics and other fields. Compared with electric drones, fuel drones have longer flight time and higher load capacity. Among them, drones equipped with diesel engines have a large market share due to their excellent performance. Compared with other means of transportation, the diesel engines used in drones have higher requirements. Not only must they be small in size and light in weight, but they must also have better heat dissipation effect.

[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 heat sinks on the outer walls of the cylinder and cylinder head, and then blow air over the surface of the heat sink 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 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 revealed the following problems: Problem 1: The cylinder of the drone adopts a single metal (usually aluminum alloy) structure, and the cylinder wall is made of solid metal. When the engine is working, the high temperature generated by combustion is conducted through the metal, and the heat is conducted from the inner wall of the combustion chamber to the heat sink outside the cylinder liner. Due to its large size, the single metal structure naturally has a large thermal resistance, resulting in poor overall thermal conductivity and inability to effectively dissipate heat from the cylinder.

[0007] Question 2: The cylinder of the drone adopts a composite structure, and the outer wall of the cylinder and the heat sink are connected by heat pipes. The high temperature generated by diesel combustion is first transmitted to the outer wall of the cylinder, and then transmitted to the heat sink through dozens or hundreds of heat pipes. The heat pipe composite structure has many pipes and a complex structure, which makes the overall installation process more difficult; at the same time, the existence of multiple pipes makes the overall structure low in strength and easy to damage. Summary of the invention

[0008] 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.

[0009] The present invention is implemented as follows: The present invention provides a diesel engine high-efficiency heat dissipation cylinder body, including a cylinder body, wherein a combustion chamber is opened at the center of the cylinder body, and a plurality of heat dissipation channels and heat conduction channels are opened on the cylinder body; 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; and the heat dissipation channel is located between the upper and lower layers of the heat conduction channels.

[0010] 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: 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.

[0011] The beneficial effect of adopting the above further scheme is: by setting opposite through holes, the drone can use natural wind to dissipate heat to 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.

[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 circumferential array of heat conduction channels is arranged outside the combustion chamber.

[0013] 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 outside of 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.

[0014] 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 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.

[0015] The beneficial effect of adopting the above further scheme is: by setting up 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.

[0016] Furthermore, the heat dissipation channel is a circular hole pipeline, 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 body; the rectangular array of heat conduction channels is arranged on two opposite sides of the cylinder body.

[0017] 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.

[0018] 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.

[0019] 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: S1 embedded heat pipe structure processing and manufacturing, processing and manufacturing the outer wall part of the heat conduction channel; S2 heat dissipation channel processing, opening a channel on the cylinder body to dissipate heat for the cylinder body; 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; S4 embedded heat pipe structure packaging and air tightness detection, the embedded heat pipe structure processed in step 1 is sealed to complete the processing of the heat conduction channel.

[0020] Furthermore, the specific processing and manufacturing method in step S1 includes the following steps: S11 uses mechanical equipment to open blind holes on the side wall of the cylinder; S12 cleans the cylinder body as a whole to remove burrs, metal chips and oil stains generated during the processing; S13 inserts a cylindrical steel core into the blind hole, fixes the steel core in the center of the blind hole using a fixing fixture, then fills the blind hole with aluminum powder and uses vibration to increase the overall mixed density; S14 welding seals the blind hole port to prevent aluminum powder from spilling; S15 places the cylinder in a continuous heating furnace for high temperature heating and introduces reducing gas to avoid oxidation; S16 Cooling, and taking out the central cylindrical steel core.

[0021] Further, the specific processing method in step S4 includes the following steps: 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; S42 transfers the cylinder to a sealed cabin of a heat pipe packaging device; S43 heats the cylinder and uses evaporated ultrapure water to expel the gas in the blind hole; S44 uses packaging equipment to evacuate the sealed cabin to maintain low pressure inside the blind hole; S45 uses friction welding to seal blind holes.

[0022] 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: (1) High heat dissipation efficiency: 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.

[0023] (2) High mechanical strength: The outer shell of the embedded heat pipe structure of the present invention is integrally formed and has high mechanical strength and is resistant to impact and deformation.

[0024] (3) Long service life and maintenance-free: The embedded heat pipe structure of the present invention adopts an integrated structure and can work normally without maintenance throughout the entire life cycle of the engine.

[0025] (4) Small size and light weight: The embedded heat pipe structure of the present invention has the characteristics of small size and light weight under the same heat dissipation effect due to its high heat dissipation efficiency, and is more suitable for diesel drones. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the first embodiment; Figure 2 It is a vertical overall cross-sectional view of the first embodiment; Figure 3 is a cross-sectional view of the heat conduction channel of the first embodiment; Figure 4 It is a cross-sectional view of the heat dissipation channel of the first embodiment; Figure 5 It is a schematic diagram of the overall structure of the second embodiment; Figure 6 is a cross-sectional view of the heat conduction channel of the second embodiment; Figure 7 It is a schematic diagram of the overall structure of the third embodiment; Figure 8 is a cross-sectional view of the heat dissipation channel of the third embodiment; Fig. 9 It is a schematic diagram of the overall structure of the fourth embodiment; Fig.10 It is a vertical overall cross-sectional view of the fourth embodiment; Fig.11 is a cross-sectional view of a heat dissipation channel of a fourth embodiment; Fig.12 This is a schematic diagram of the overall structure of the fifth embodiment; Fig.13 is a cross-sectional view of the heat dissipation channel of the fifth embodiment; In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Cylinder body; 11. Combustion chamber; 2. Heat dissipation channel; 3. Heat conduction channel; 4. Auxiliary heat dissipation channel. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] like Figure 1-4 As shown, the first embodiment of the high-efficiency heat dissipation cylinder block of a diesel engine provided by the present invention includes a cylinder block 1. The cylinder block 1 is integrally formed, and a combustion chamber 11 for releasing energy by diesel combustion is provided at its center. The cylinder block 1 is also provided with a plurality of heat dissipation channels 2 and heat conduction channels 3 for heat transfer; wherein the heat conduction channel 3 is used to conduct the high temperature generated by the combustion chamber to the outer layer of the cylinder block 1, and the heat dissipation channel 2 is 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 the heat conduction channels 3 are regularly arranged on the periphery of the combustion chamber 11; wherein the axis of the heat conduction channel 3 is perpendicular to the busbar of the combustion chamber 11; and the heat dissipation channel 2 is located between the upper and lower layers of the heat conduction channels 3.

[0030] 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.

[0031] like Figure 5 , 6 As shown, a second embodiment of a diesel engine high-efficiency heat dissipation cylinder block provided by the present invention is shown, which is different from the first embodiment in that a circumferential array of heat conduction channels 3 is arranged at the periphery of the combustion chamber 11.

[0032] 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 of the cylinder block 1; the auxiliary heat dissipation channel 4 is located between the 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 block 1.

[0033] 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 block the through hole on the other side wall so that the passage is only inside the cylinder body 1.

[0034] like Figure 9-11 As shown, the fourth embodiment of the diesel engine high-efficiency heat dissipation cylinder block 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.

[0035] like Fig.12 , 13 As shown, it is a fifth embodiment of a diesel engine high-efficiency heat dissipation cylinder block provided by the present invention. The difference from the fourth embodiment is that a heat conduction channel 3 is arranged in a circular array on the periphery of a combustion chamber 11, and compared with the fourth embodiment, due to the distribution problem of the heat conduction channel 3 in this embodiment, the distance between the inlet and the outlet of the heat dissipation channel 2 is farther; the difference from the second embodiment is 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.

[0036] Optionally, in the above technical solution, when opening the heat dissipation channel 2, it is preferred to drill through holes around the cylinder body 1. At this time, because the through holes intersect, the heat dissipation channel 2 is connected inside the cylinder body 1, and the opening used as the inlet is reserved, and the openings on the other side walls of the cylinder body are sealed. When sealing, it should be noted that the internal pipeline is partitioned at the same time. Finally, a new blind hole is drilled on the inlet side to serve as an outlet. The partition is located between the inlet and the outlet, and the new blind hole is connected to the internal pipeline.

[0037] The present invention also provides a method for processing a diesel engine high-efficiency heat dissipation cylinder body, and the specific processing method includes: S1: Processing and manufacturing of the embedded heat pipe structure, processing and manufacturing the outer wall portion of the heat conduction channel 3; S2 heat dissipation channel processing, opening a channel on the cylinder body 1 to dissipate 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.

[0038] Optionally, in the above technical solution, the specific processing and manufacturing method in step S1 includes the following steps: S11: using mechanical equipment to open a blind hole on the side wall of the cylinder body 1; S12 cleans the cylinder body 1 as a whole to remove burrs, metal chips and oil stains generated during the processing; S13 inserts a cylindrical steel core into the blind hole, fixes the steel core at the center of the blind hole with a fixing fixture, then fills aluminum powder into the blind hole, and uses vibration to increase the overall mixed density; after filling aluminum powder, knocks the cylinder 1 to make the aluminum powder vibrate and fall, compacts the aluminum powder with a corresponding mold, and fills aluminum powder again, and repeats the above operation three times; S14 welding seals the blind hole port to prevent aluminum powder from spilling; S15 places the cylinder in a continuous heating furnace for high temperature heating and introduces reducing gas to avoid oxidation; S16 Cooling, and taking out the central cylindrical steel core.

[0039] Optionally, in the above technical solution, the specific processing method in step S4 includes the following steps: S41 Place the cylinder body 1 horizontally, with the blind hole opening facing upward, and use a water injection device to inject ultrapure water into the blind hole; S42 transfers the cylinder to a sealed cabin of a heat pipe packaging device; S43 heats the cylinder and uses evaporated ultrapure water to expel the gas in the blind hole; S44 uses packaging equipment to evacuate the sealed cabin to maintain low pressure inside the blind hole; S45 uses friction welding to seal blind holes.

[0040] Specifically, the heat dissipation principle of the present invention is as follows: The absorption and release of heat by an object are relative. Whenever there is a temperature difference, heat will inevitably be transferred from the high temperature to the low temperature. The heat pipe structure uses evaporative cooling to make the temperature difference between the two ends of the heat pipe very large, so that the heat can be transferred quickly.

[0041] The outer wall of the combustion chamber 11 of the cylinder and the outer wall of the embedded heat pipe structure are an integrated structure. The heat generated by the combustion of diesel is conducted to the heat conduction channel 3 through the outer wall of the combustion chamber 11 for heating. The inside of the heat conduction channel 3 is in a negative pressure state, and the ultrapure water injected inside will vaporize and evaporate at about 30 degrees Celsius. The temperature of the heating section rises, the ultrapure water evaporates, and the steam pressure is higher than that of the condensation section, forming a pressure difference at both ends. The pressure difference drives the steam from the heating section to the condensation section, and the steam releases heat in the condensation section and condenses into liquid again.

[0042] The inner wall of the heat conduction channel 3 is attached with a capillary porous material formed by sintering aluminum powder. Due to evaporation, a meniscus is formed in the capillary pores entering the tube core in the heating section, where a capillary pumping force is formed. The liquid then flows back to the heating section along the porous material under the action of the capillary pumping force. This cycle continues, and heat is transferred from the end of the heat conduction channel 3 close to the combustion chamber 11 to the end away from the combustion chamber 11.

[0043] This cycle is rapid and heat can be conducted away continuously.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A diesel engine high-efficiency heat dissipation cylinder block, comprising a cylinder block (1), characterized in that: A combustion chamber (11) is provided at the center of the cylinder body (1), and a plurality of heat dissipation channels (2) and heat conduction channels (3) are provided on the cylinder body (1); the heat dissipation channels (2) and the heat conduction channels (3) are 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); and the heat dissipation channel (2) is located between the upper and lower layers of the heat conduction channels (3).

2. 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. 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 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. 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. 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. A method for processing a diesel engine high-efficiency heat dissipation cylinder body, characterized in that: This method is used to manufacture a diesel engine high-efficiency heat dissipation cylinder block according to any one of claims 1 to 6; wherein the specific processing method includes: S1: Processing the embedded heat pipe structure to manufacture the outer wall of the heat conduction channel (3); 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).

8. The method for processing a diesel engine high-efficiency heat dissipation cylinder block according to claim 7, characterized in that: The specific processing and manufacturing method in step S1 includes the following steps: S11: using mechanical equipment to open a blind hole on the side wall of the cylinder body (1); S12: Clean the cylinder body (1) as a whole to remove burrs, metal chips and oil stains generated during the processing; S13: inserting a cylindrical steel core into the blind hole, fixing the steel core at the center of the blind hole using a fixing fixture, then filling the blind hole with aluminum powder, and using vibration to increase the overall mixed density; S14: Weld and seal the blind hole port to prevent aluminum powder from spilling; S15: placing the cylinder in a continuous heating furnace for high temperature heating, and introducing reducing gas to avoid oxidation; S16: Cool and remove the central cylindrical steel core.

9. The method for processing a diesel engine high-efficiency heat dissipation cylinder block according to claim 7, 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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