A compact unmanned aerial vehicle external liquid-liquid heat exchanger and a manufacturing method thereof

Abstract

The application discloses a compact unmanned aerial vehicle external air-liquid heat exchanger and a manufacturing method thereof, and belongs to the technical field of air-liquid heat exchangers. The air-liquid heat exchanger comprises a wind cover and a heat exchanger inner core located in the wind cover; the heat exchanger inner core is composed of air-side cold plates and liquid-side cold plates which are alternately and stacked from top to bottom; the air-side cold plate comprises an air-side bottom plate and an air-side fin; the air-side fin is located on the upper surface of the air-side cold plate; the liquid-side cold plate comprises a liquid-side bottom plate; the upper surface of the liquid-side bottom plate is provided with a backflow area, an inflow area and an outflow area; the inflow area is provided with a shunt fin and a left fin, the backflow area is provided with a backflow fin, and the outflow area is provided with a confluence fin and a right fin; wherein, the left fin, the backflow fin and the right fin are all provided with flow channels which are parallel to each other, and the flow channels on the left fin, the backflow fin and the right fin are one-to-one corresponding and communicated. The application has the advantages of small volume, compact structure, high heat exchange efficiency, easy processing, low waste rate, good aerodynamic characteristics and the like.

Description

Technical Field

[0001] This invention belongs to the field of air-liquid heat exchanger technology, specifically relating to a compact external air-liquid heat exchanger for unmanned aerial vehicles and its manufacturing method. Background Technology

[0002] With the increasing integration and computing power of electronic devices within drones, the heat dissipation and heat flux density are constantly rising. Traditional air-cooling systems can no longer meet the system's thermal control requirements, leading to the widespread application of controlled-flow cooling systems using ram air. Air-liquid heat exchangers are key devices in controlled-flow cooling systems, facilitating heat exchange between air and coolant. Their function is to use coolant airflow to remove heat from the coolant, lowering its temperature, and then using the cooled coolant to dissipate heat from the electronic devices. The efficient use of ram air pressure, small size, compact structure, high heat exchange efficiency, high reliability, and simple manufacturing process represent new requirements for the design and manufacture of air-liquid heat exchangers.

[0003] Common air-liquid heat exchangers are usually placed inside the UAV, with airflow guided through air ducts and exhaust ducts. The disadvantages of this approach are that the air pressure head loss is relatively large, resulting in low efficiency of the air-liquid heat exchanger, difficulty in reducing size and weight, and the complex internal structure of the air-liquid heat exchanger leads to a low welding success rate during processing. The use of multiple welding processes can easily cause reliability issues, and weld cracking is more likely to occur under the more severe vibration environment of airborne systems.

[0004] External air-liquid radiators for drones lack air ducts, have poor streamlined and aerodynamic characteristics, and suffer from significant pressure head loss, resulting in poor actual performance during use.

[0005] Air-liquid heat exchangers are typically designed and verified under the most severe conditions (high temperature conditions). However, when UAVs fly under conditions more favorable for heat exchange (low temperature environments), the commonly used air-liquid heat exchangers, due to their fixed structure, result in relatively low supply liquid temperatures, which can easily lead to condensation and other problems. If it is necessary to adjust the supply liquid temperature, it is necessary to change the flow rate of the coolant entering the heat exchanger or adopt a compression refrigeration working mode, which greatly increases the complexity of the system. This is unacceptable for UAV platforms that require compact structure, small size, and light weight. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a compact UAV air-liquid heat exchanger that avoids the shortcomings of the above-mentioned background technology. It has the advantages of small size, compact structure, high heat exchange efficiency, easy processing, low scrap rate, high maximum heat exchange capacity, easy adjustment of heat exchange performance and coolant outlet temperature, and good aerodynamic characteristics.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A compact external air-liquid heat exchanger for unmanned aerial vehicles includes a shroud and a heat exchanger core located inside the shroud; the heat exchanger core is composed of alternating layers of air-side cooling plates and liquid-side cooling plates from top to bottom;

[0009] The wind-side cooling plate includes a wind-side base plate and wind-side fins; the wind-side fins are located on the upper surface of the wind-side cooling plate.

[0010] The liquid-side cooling plate includes a liquid-side bottom plate; the upper surface of the liquid-side bottom plate is provided with a reflux region, an inlet region, and an outlet region; the inlet region is provided with a flow-diverting fin and a left fin, the reflux region is provided with a reflux fin, and the outlet region is provided with a flow-combining fin and a right fin; wherein the left fin, the reflux fin, and the right fin are all provided with mutually parallel flow channels, and the flow channels on the left fin, the reflux fin, and the right fin correspond one-to-one and are connected.

[0011] The inlet end of the left fin and the outlet end of the right fin are respectively connected to the flow channels of the splitting fin and the converging fin; the liquid inlet is located at the other end of the flow channel of the splitting fin, and the liquid outlet is located at the other end of the flow channel of the converging fin.

[0012] Furthermore, the upper surface of the wind-side base plate is provided with three parallel wind-side regions, which are separated by a partition strip; the wind-side fins are fixed in the corresponding regions.

[0013] Furthermore, the return fin has an isosceles triangular structure, and the flow channel on the return fin is parallel to the base of the isosceles triangle.

[0014] Furthermore, the air-cooled base plate has through holes at two adjacent corners, which are used for liquid inlet and liquid outlet of the liquid-side cooling plate, respectively.

[0015] Furthermore, the air duct of the wind-side fin and the flow channels of the left and right fins are perpendicular to each other.

[0016] Furthermore, the hood is a through-cavity structure with openings at the front and back, including a base plate and a surrounding plate, with the surrounding plate fixed to the base plate; the base plate is also provided with two liquid inlets.

[0017] Furthermore, the enclosure includes an upper cover plate, a left side plate, and a right side plate; the left side plate and the right side plate are trapezoidal surfaces that are narrower at the top and wider at the bottom.

[0018] Furthermore, the liquid-side cooling plate includes an even number of liquid-side cooling plates and an odd number of liquid-side cooling plates; adjacent even-numbered liquid-side cooling plates and odd-numbered liquid-side cooling plates are separated by air-side cooling plates; the liquid flows in opposite directions within the even-numbered liquid-side cooling plates and odd-numbered liquid-side cooling plates.

[0019] Furthermore, the even-numbered liquid-side cooling plates and the odd-numbered liquid-side cooling plates are 180° rotationally symmetrical on the air-side cooling plate between them; the liquid inlets of the even-numbered liquid-side cooling plates and the odd-numbered liquid-side cooling plates are connected by an electric three-way valve, and the other port of the electric three-way valve is the main liquid inlet.

[0020] Furthermore, the liquid outlets of the even-numbered liquid-side cooling plates and the odd-numbered liquid-side cooling plates are connected to a second electric three-way valve, the other end of which is the main liquid outlet; a temperature sensor is installed at the main liquid outlet of the second electric three-way valve.

[0021] A method for manufacturing a compact external air-liquid heat exchanger for unmanned aerial vehicles (UAVs), for manufacturing a compact external air-liquid heat exchanger for UAVs as described above, includes the following steps:

[0022] Step 1: The left side plate, right side plate, and top cover plate of the wind hood are formed by integral bending of aluminum alloy sheet.

[0023] Step 2: Milling process is used to machine the bottom plate, wind-side bottom plate, and liquid-side bottom plate of the wind shroud;

[0024] Step 3: Stamp the thin metal sheet to form straight fins;

[0025] Step 4: Process the straight fins into wind-side fins, diversion fins, left fins, return fins, confluence fins, and right fins;

[0026] Step 5: Stack the air-side cooling plate and liquid-side cooling plate in sequence to form the heat exchanger core, place brazing filler metal on the mating surfaces of each component, fix it with stainless steel clamps, and place it in a vacuum brazing furnace for welding.

[0027] The beneficial effects of this invention are as follows:

[0028] 1) The present invention is an air-liquid heat exchanger placed outside the drone. By combining the shroud with the heat exchanger core, an air inlet duct and an exhaust duct are formed, which have good aerodynamic characteristics. Compared with the heat exchanger placed inside the drone, it can draw in a larger flow of air, thereby achieving higher heat exchange in the same volume.

[0029] 2) In this invention, the heat exchanger core and the fan shroud are processed separately and finally formed into a whole by screwing. The heat exchanger core is welded as a whole in one go, which simplifies the process and avoids the risk of welding failure caused by repeated welding and heating.

[0030] 3) The air-side fins of this invention adopt a single-flow path, which is short and straight, reducing wind resistance, increasing the ventilation volume of the heat exchanger, and further improving the heat exchange performance of the heat exchanger; the liquid-side fins form a double-flow channel structure through fin cutting and combination, which slows down the liquid flow speed, allowing it to fully exchange heat with the air side and reduce the liquid temperature. It can also be arranged as a 4-flow or other structural form as needed; each liquid-side cold plate is a parallel structure, which reduces the resistance of the coolant flow on the liquid side.

[0031] 4) The heat exchanger of the present invention is connected to an electric three-way valve at the coolant inlet to regulate and control the flow rate of coolant entering the odd-numbered liquid-side cold plates and the even-numbered liquid-side cold plates, thereby adjusting the heat exchange capacity and the coolant outlet temperature. When it is necessary to increase the heat exchange capacity and decrease the coolant temperature, the flow rate of coolant entering the odd-numbered liquid-side cold plates and the even-numbered liquid-side cold plates is equal. At this time, the liquid-side cold plates of the system are all in parallel, the system flow resistance is minimal, the flow rate is maximum, and all air-side cold plates and liquid-cooled cold plates participate in heat exchange. Moreover, since the odd-numbered liquid-side cold plates and the even-numbered liquid-side cold plates are symmetrically distributed on both sides of the air-side cold plates, and the coolant flow direction inside the odd-numbered liquid-side cold plates and the even-numbered liquid-side cold plates is opposite, the heat exchange capacity is further enhanced, and the heat exchange performance of the heat exchanger is improved. When electronic equipment requires high-temperature coolant for insulation, the electric three-way valve can close one inlet, directing all flow into either the odd-numbered or even-numbered liquid-side cooling plates. This maximizes system resistance, minimizes flow, and ensures that only a portion of the air-side cooling plates participate in heat exchange, resulting in minimal heat transfer and a relatively high coolant temperature.

[0032] 5) A three-way valve is connected to the outlet of the heat exchanger of the present invention. A temperature sensor is installed at the outlet of the three-way valve. The opening of the electric three-way valve is adjusted according to the deviation between the data of the temperature sensor on the three-way valve and the target temperature of the coolant, until the requirements of the coolant temperature control target are met, so as to realize the function of regulating and controlling the supply temperature.

[0033] 6) The wind-side cooling plate and liquid-side cooling plate of the present invention use the same fin structure, which is beneficial to reduce costs and improve standardization. The joint surface between the fin and the base plate is large and uniform. After welding, the overall strength and rigidity are good, which also reduces the welding difficulty and improves the welding success rate. Attached Figure Description

[0034] Figure 1 This is a structural schematic diagram of an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure from another perspective of an embodiment of the present invention;

[0036] Figure 3 yes Figure 1 A schematic diagram of the front structure;

[0037] Figure 4 yes Figure 1 A schematic diagram of the side structure;

[0038] Figure 5 yes Figure 1 Exploded view;

[0039] Figure 6 This is a schematic diagram of the heat exchanger core composition according to an embodiment of the present invention;

[0040] Figure 7 This is a connection diagram of the heat exchanger usage method according to an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of the wind-side cooling plate in an embodiment of the present invention;

[0042] Figure 9 yes Figure 8 A schematic diagram of the exploded structure;

[0043] Figure 10 This is a schematic diagram of the structure of the odd-numbered liquid-side cooling plate in an embodiment of the present invention;

[0044] Figure 11 This is a schematic diagram of the internal coolant flow direction of the odd-numbered liquid-side cooling plates in an embodiment of the present invention;

[0045] Figure 12 This is a schematic diagram of the structure of the even-numbered liquid-side cooling plate in an embodiment of the present invention;

[0046] Figure 13 This is a schematic diagram of the internal coolant flow direction of the even-numbered liquid-side cooling plates in an embodiment of the present invention;

[0047] Figure 14 yes Figure 12 A schematic diagram of the exploded structure;

[0048] Figure 15 This is a schematic diagram of the fin structure.

[0049] In the diagram: shroud 1, heat exchanger core 2, top cover 11, bottom plate 12, left side plate 13, right side plate 14, odd-numbered liquid-side cooling plate inlet 1211, odd-numbered liquid-side cooling plate outlet 1221, even-numbered liquid-side cooling plate inlet 1212, even-numbered liquid-side cooling plate outlet 1222.

[0050] Wind-side cooling plate 21, wind-side bottom plate 211, wind-side right fin 212, wind-side middle fin 213, wind-side left fin 214.

[0051] Liquid-side cooling plate 22, liquid-side bottom plate 221, liquid-side diversion fin 222, liquid-side left fin 223, return fin 224, liquid-side right fin 225, liquid-side confluence fin 226, liquid-side cooling plate inlet 2211, liquid-side cooling plate outlet 2221.

[0052] Fin 200. Detailed Implementation

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings and examples. However, the embodiments described herein are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] A compact external air-liquid heat exchanger for unmanned aerial vehicles includes a shroud and a heat exchanger core located inside the shroud; the heat exchanger core is composed of alternating layers of air-side cooling plates and liquid-side cooling plates from top to bottom;

[0055] The wind-side cooling plate includes a wind-side base plate and wind-side fins; the wind-side fins are located on the upper surface of the wind-side cooling plate.

[0056] The liquid-side cooling plate includes a liquid-side bottom plate; the upper surface of the liquid-side bottom plate is provided with a reflux region, an inlet region, and an outlet region; the inlet region is provided with a flow-diverting fin and a left fin, the reflux region is provided with a reflux fin, and the outlet region is provided with a flow-combining fin and a right fin; wherein the left fin, the reflux fin, and the right fin are all provided with mutually parallel flow channels, and the flow channels on the left fin, the reflux fin, and the right fin correspond one-to-one and are connected.

[0057] The inlet end of the left fin and the outlet end of the right fin are respectively connected to the flow channels of the splitting fin and the converging fin; the liquid inlet is located at the other end of the flow channel of the splitting fin, and the liquid outlet is located at the other end of the flow channel of the converging fin.

[0058] Furthermore, the upper surface of the wind-side base plate is provided with three parallel wind-side regions, which are separated by a partition strip; the wind-side fins are fixed in the corresponding regions.

[0059] Furthermore, the return fin has an isosceles triangular structure, and the flow channel on the return fin is parallel to the base of the isosceles triangle.

[0060] Furthermore, the air duct of the wind-side fin and the flow channels of the left and right fins are perpendicular to each other.

[0061] Furthermore, the hood is a through-cavity structure with openings at the front and back, including a base plate and a surrounding plate, with the surrounding plate fixed to the base plate; the base plate is also provided with two liquid inlets.

[0062] Furthermore, the enclosure includes an upper cover plate, a left side plate, and a right side plate; the left side plate and the right side plate are trapezoidal surfaces that are narrower at the top and wider at the bottom.

[0063] Furthermore, the liquid-side cooling plate includes an even number of liquid-side cooling plates and an odd number of liquid-side cooling plates; adjacent even-numbered liquid-side cooling plates and odd-numbered liquid-side cooling plates are separated by air-side cooling plates; the liquid flows in opposite directions within the even-numbered liquid-side cooling plates and odd-numbered liquid-side cooling plates.

[0064] Furthermore, the even-numbered liquid-side cooling plates and the odd-numbered liquid-side cooling plates are 180° rotationally symmetrical on the air-side cooling plate between them; the liquid inlets of the even-numbered liquid-side cooling plates and the odd-numbered liquid-side cooling plates are connected by an electric three-way valve, and the other port of the electric three-way valve is the main liquid inlet.

[0065] Furthermore, the liquid outlets of the even-numbered liquid-side cooling plates and the odd-numbered liquid-side cooling plates are connected to a second electric three-way valve, the other end of which is the main liquid outlet; a temperature sensor is installed at the main liquid outlet of the second electric three-way valve.

[0066] The air-cooled base plate has through holes at its four corners for liquid inlet and outlet of even-numbered and odd-numbered liquid-side cooling plates, respectively.

[0067] A method for manufacturing a compact external air-liquid heat exchanger for unmanned aerial vehicles (UAVs), for manufacturing a compact external air-liquid heat exchanger for UAVs as described above, includes the following steps:

[0068] Step 1: The left side plate, right side plate, and top cover plate of the wind hood are formed by integral bending of aluminum alloy sheet.

[0069] Step 2: Milling process is used to machine the bottom plate, wind-side bottom plate, and liquid-side bottom plate of the wind shroud;

[0070] Step 3: Stamp the thin metal sheet to form straight fins;

[0071] Step 4: Process the straight fins into wind-side fins, diversion fins, left fins, return fins, confluence fins, and right fins;

[0072] Step 5: Stack the air-side cooling plate and liquid-side cooling plate in sequence to form the heat exchanger core, place brazing filler metal on the mating surfaces of each component, fix it with stainless steel clamps, and place it in a vacuum brazing furnace for welding.

[0073] The following is a more specific example:

[0074] Reference Figures 1 to 5 , Figure 15In this embodiment, the air shroud and the heat exchanger core together form an air-liquid heat exchanger. The air shroud consists of a left side plate, a right side plate, a top cover plate, and a bottom plate. The left side plate, right side plate, and top cover plate are integrally formed by bending thin aluminum alloy sheets. They are fixed to the bottom plate by screws through mounting holes. Viewed from the side, it forms a trapezoidal structure that is wider at the bottom and narrower at the top. The heat exchanger core is fixed to the bottom plate of the air shroud by screws. The shape of the structure, wider at the bottom and narrower at the top, helps to reduce wind resistance during high-speed flight of the aircraft platform. At the same time, the front and rear cavities formed between the air shroud and the heat exchanger core serve as air inlet and exhaust ducts, which helps to increase the air pressure difference between the inlet and outlet of the heat exchanger, thereby allowing more air to flow through the heat exchanger core and enhancing heat exchange efficiency.

[0075] The heat exchanger core is composed of multiple layers of air-side and liquid-side cooling plates stacked from top to bottom. The air-side cooling plate consists of an air-side bottom plate, an air-side right fin, an air-side middle fin, and an air-side left fin. The liquid-side cooling plate consists of a liquid-side bottom plate, liquid-side diversion fins, a liquid-side left fin, a return fin, a liquid-side right fin, and a liquid-side confluence fin.

[0076] The wind-side right fin, wind-side middle fin, wind-side left fin, liquid-side diversion fin, liquid-side left fin, return fin, liquid-side right fin, and liquid-side confluence fin are processed from fin 200 into corresponding sizes and shapes as needed.

[0077] Reference Figures 6 to 14 The heat exchanger is connected to an electric three-way valve at the coolant inlet to regulate and control the coolant flow rate into the odd-numbered and even-numbered liquid-side cold plates, thereby adjusting the heat exchanger's heat exchange capacity and coolant outlet temperature. When it is necessary to increase the heat exchange capacity and decrease the coolant temperature, the coolant flow rate into the odd-numbered and even-numbered liquid-side cold plates is equal. At this time, all liquid-side cold plates in the system are in parallel, the system flow resistance is minimal, the flow rate is maximum, and all air-side cold plates and liquid-cooled cold plates participate in heat exchange. Moreover, since the odd-numbered and even-numbered liquid-side cold plates are symmetrically distributed on both sides of the air-side cold plates, and the coolant flow direction inside the odd-numbered and even-numbered liquid-side cold plates is opposite, the heat exchange capacity is further enhanced, and the heat exchanger's heat exchange performance is improved. When electronic equipment requires high-temperature coolant for insulation, the electric three-way valve can close one inlet, directing all flow into either the odd-numbered or even-numbered liquid-side cooling plates. This maximizes system resistance, minimizes flow, and ensures that only a portion of the air-side cooling plates participate in heat exchange, resulting in minimal heat transfer and a relatively high coolant temperature.

[0078] A second electric three-way valve is connected to the outlet of the heat exchanger. A temperature sensor is installed at the outlet of the second electric three-way valve. The opening of the electric three-way valve is adjusted according to the deviation between the data of the temperature sensor on the three-way valve and the target temperature of the coolant, until the target temperature of the coolant is met, so as to realize the function of regulating and controlling the supply temperature.

[0079] in Figure 14It can also be used as Figure 10 Exploded view.

[0080] The air-liquid heat exchanger is made of LF21 aluminum alloy, and the processing method is as follows:

[0081] 1. The left side panel, right side panel, and top cover of the wind hood are processed by integral bending of aluminum alloy sheet;

[0082] 2. The bottom plate of the windshield is machined using a milling process;

[0083] The 3-fin 200 is a straight fin made of thin metal sheet by stamping. Its heat transfer and fluid dynamics characteristics are similar to those of pipe flow. Compared with other fin structures, its characteristic is that the flow resistance coefficient is relatively small.

[0084] 4. Process the fins into wind-side right fin, wind-side middle fin, wind-side left fin, liquid-side diversion fin, liquid-side left fin, reflux fin, liquid-side right fin, and liquid-side confluence fin;

[0085] 5. Stack the air-side cooling plate and liquid-side cooling plate in sequence to form the heat exchanger core, place the brazing filler metal on the mating surfaces of each component, fix it with stainless steel clamps, and place it in a vacuum brazing furnace for welding.

Claims

1. A compact external air-liquid heat exchanger for unmanned aerial vehicles (UAVs), comprising a shroud and a heat exchanger core located within the shroud; characterized in that, The heat exchanger core is composed of alternating layers of air-side cooling plates and liquid-side cooling plates from top to bottom; The wind-side cooling plate includes a wind-side base plate and wind-side fins; the wind-side fins are located on the upper surface of the wind-side cooling plate. The liquid-side cooling plate includes a liquid-side bottom plate; the upper surface of the liquid-side bottom plate is provided with a reflux area, an inlet area, and an outlet area; the inlet area is provided with a diversion fin and a left fin, the reflux area is provided with a reflux fin, and the outlet area is provided with a converging fin and a right fin; wherein the left fin, the reflux fin, and the right fin are all provided with flow channels, and the flow channels on the left fin, the reflux fin, and the right fin correspond one-to-one and are connected. The inlet end of the left fin and the outlet end of the right fin are respectively connected to the flow channels of the splitting fin and the converging fin; the liquid inlet is located at the other end of the flow channel of the splitting fin, and the liquid outlet is located at the other end of the flow channel of the converging fin. The liquid-side cooling plate includes an even number of liquid-side cooling plates and an odd number of liquid-side cooling plates; adjacent even-numbered liquid-side cooling plates and odd-numbered liquid-side cooling plates are separated by air-side cooling plates; the liquid flows in opposite directions in the even-numbered liquid-side cooling plates and odd-numbered liquid-side cooling plates. The even-numbered liquid-side cooling plates and the odd-numbered liquid-side cooling plates are rotated symmetrically on the air-side cooling plate between them, with the projections of the even-numbered liquid-side cooling plates and the odd-numbered liquid-side cooling plates being connected by an electric three-way valve, the other port of which is the main liquid inlet. The liquid outlets of the even-numbered liquid-side cooling plates and the odd-numbered liquid-side cooling plates are connected to the second electric three-way valve, the other end of which is the main liquid outlet; a temperature sensor is installed at the main liquid outlet of the second electric three-way valve. Among them, the electric three-way valve is used to regulate and control the flow rate of coolant entering the odd-numbered liquid-side cold plates and the even-numbered liquid-side cold plates, thereby adjusting the heat exchanger's heat exchange capacity and coolant outlet temperature. When it is necessary to increase the heat exchange capacity and decrease the coolant temperature, the flow rate of coolant entering the odd-numbered liquid-side cold plates and the even-numbered liquid-side cold plates is equal. At this time, the liquid-side cold plates of the system are all in parallel, the system flow resistance is the minimum, the flow rate is the maximum, and all air-side cold plates and liquid-cooled cold plates participate in heat exchange. When electronic equipment requires high-temperature coolant for insulation, the electric three-way valve closes one inlet, directing all flow into either the odd-numbered or even-numbered liquid-side cooling plates. This results in maximum system resistance, minimum flow, and only a portion of the air-side cooling plates participating in heat exchange, thus minimizing heat exchange.

2. The compact external air-liquid heat exchanger for unmanned aerial vehicles according to claim 1, characterized in that, The upper surface of the wind-side base plate is provided with three parallel wind-side regions, which are separated by a partition strip; the wind-side fins are fixed in the corresponding regions.

3. A compact external air-liquid heat exchanger for unmanned aerial vehicles according to claim 1, characterized in that, The return fin has an isosceles triangular structure, and the flow channel on the return fin is parallel to the base of the isosceles triangle.

4. A compact external air-liquid heat exchanger for unmanned aerial vehicles according to claim 1, characterized in that, The wind-side bottom plate has through holes at two adjacent corners, which are used for liquid inlet and liquid outlet of the liquid-side cooling plate, respectively.

5. A compact external air-liquid heat exchanger for unmanned aerial vehicles according to claim 1, characterized in that, The air duct of the wind-side fin and the flow channels of the left and right fins are perpendicular to each other.

6. A compact external air-liquid heat exchanger for unmanned aerial vehicles according to claim 1, characterized in that, The hood is a through-cavity structure with openings at the front and back, including a base plate and a surrounding plate, with the surrounding plate fixed to the base plate; the base plate is also provided with two liquid inlets; the surrounding plate includes an upper cover plate, a left side plate and a right side plate; the left side plate and the right side plate are trapezoidal surfaces that are narrower at the top and wider at the bottom.

7. A method for manufacturing a compact external air-liquid heat exchanger for unmanned aerial vehicles (UAVs), used to manufacture a compact external air-liquid heat exchanger for UAVs as described in any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: The left side plate, right side plate, and top cover plate of the wind hood are formed by integral bending of aluminum alloy sheet. Step 2: Milling process is used to machine the bottom plate, wind-side bottom plate, and liquid-side bottom plate of the wind shroud; Step 3: Stamp the thin metal sheet to form straight fins; Step 4: Process the straight fins into wind-side fins, diversion fins, left fins, return fins, confluence fins, and right fins; Step 5: Stack the air-side cooling plate and liquid-side cooling plate in sequence to form the heat exchanger core, place the brazing filler metal on the mating surfaces of each component, fix it with stainless steel clamps, and place it in a vacuum brazing furnace for welding.

Images