Sand prevention and corrosion resistance combined heat exchange structure of low-altitude aircraft

Abstract

The utility model discloses a sand prevention and corrosion resistance combined heat exchange structure of a low-altitude aircraft. Comprising an aluminum alloy heat dissipation core body (1), the windward end of the aluminum alloy heat dissipation core body (1) is connected with a titanium alloy heat dissipation core body (2), and a flow channel of a windward side fin A (3) of the aluminum alloy heat dissipation core body (1) is correspondingly communicated with a flow channel of a windward side fin B (4) of the titanium alloy heat dissipation core body (2). According to the heat exchange device, dust and particles can be prevented from entering the heat exchange device at a high speed in the flying process of an aviation aircraft, and the surfaces of fins, partition plates and the like of the heat exchange device are prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange supporting aircraft and engines, in particular to a sand-proof and corrosion-resistant combined heat exchange structure for low-altitude aircraft. Background Art

[0002] In the aviation field, aircraft must cope with various harsh environmental conditions when flying in the troposphere, including high concentrations of sand, dust and particulate matter. These powdery substances may hit key components of the aircraft at high speed, such as air heat exchangers. The traditional solution is to use aluminum alloy materials and improve their corrosion resistance through surface passivation, anodizing and painting. However, these protective measures may be damaged after being subjected to mechanical impact (such as the impact of sand, dust and particulate matter), causing the aluminum alloy substrate to be exposed to the corrosive environment, and then corrosion phenomena such as pitting corrosion occur.

[0003] While titanium alloys or stainless steel offer excellent corrosion resistance in place of aluminum alloys, their high density significantly increases the weight of the aircraft. This increased weight directly translates to increased fuel consumption and higher operating costs. Therefore, finding materials or technical solutions that can both resist corrosion in extreme environments and maintain a low weight is a key research direction in the aviation field. Utility Model Content

[0004] The purpose of this utility model is to provide a sand-proof and corrosion-resistant combined heat exchange structure for low-altitude aircraft. This utility model can prevent sand, dust, and particles from entering the heat exchange device at high speed during flight, causing damage to the fins, partitions, and other surfaces of the heat exchange device.

[0005] The technical solution of the utility model is: a sand-proof and corrosion-resistant combined heat exchange structure for low-altitude aircraft, comprising an aluminum alloy heat dissipation core, the windward end of the aluminum alloy heat dissipation core is connected to a titanium alloy heat dissipation core, and the flow channel of the windward side fin A of the aluminum alloy heat dissipation core is correspondingly connected to the flow channel of the windward side fin B of the titanium alloy heat dissipation core.

[0006] In the aforementioned low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure, the windward side fin A and the windward side fin B are connected via a copper diffusion welding layer, or the windward side fin A and the windward side fin B are formed into an integrated structure by 3D printing.

[0007] In the aforementioned low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure, the thickness of the copper diffusion welding layer is 0.7 to 1 mm.

[0008] In the aforementioned low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure, the surface of the windward side fin B is provided with a ceramic coating.

[0009] In the aforementioned low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure, the windward side fins B are in a corrugated structure along the air flow direction.

[0010] In the aforementioned low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure, the length of the windward side fin A in the air flow direction is 70 to 80 mm.

[0011] The advantages of the utility model are:

[0012] The present invention successfully achieves seamless connection between the two heat dissipation core structures by connecting the titanium alloy heat dissipation core to the windward end of the aluminum alloy heat dissipation core through a copper diffusion welding layer or 3D printing. This structure protects the aluminum alloy from the erosion of particles such as sand and gravel in the high-speed stamping wind, which may damage the passivation layer, anodized layer and paint layer on the surface of the aluminum alloy. By combining the excellent anti-corrosion performance of the titanium alloy heat dissipation core, the present invention significantly improves the anti-corrosion ability of the heat exchange device, extends the service life of the equipment, and improves the working stability in harsh environments. By adding a titanium alloy heat dissipation core in front of the aluminum alloy heat dissipation core, a protective barrier is formed to intercept particles in the high-speed airflow and prevent them from directly contacting the aluminum alloy surface, thereby protecting the aluminum alloy from wear and corrosion. By utilizing the natural anti-corrosion properties of the titanium alloy heat dissipation core and the thermal conductivity advantages of the aluminum alloy heat dissipation core, a high-performance composite heat exchange system is constructed. This not only ensures excellent anti-corrosion performance, but also ensures efficient heat transfer. The copper diffusion weld layer connects the two heat sink cores, achieving a microscopic metallurgical bond between the aluminum alloy and the titanium alloy. This provides a strong and reliable solution for heat exchange applications in extreme environments. Through ingenious design and advanced manufacturing processes, this utility model provides a high-performance, long-life heat exchange device with significant engineering application value and market prospects.

[0013] The windward side fin B of the present invention adopts a unique corrugated fin design. The corrugated fins can effectively convert high-speed turbulent air into a stable airflow with a lower speed, which is crucial for protecting the aluminum alloy fins. At the same time, the corrugated shape helps to change the direction of the airflow, thereby reducing the airflow speed and reducing the impact of the airflow on the heat exchange device. Especially in the case of high-speed ram wind, this design can effectively reduce the carrying and deposition of particulate matter. Particle interception: When an airflow containing particles such as sand and gravel passes through the corrugated fins, the particles will adhere to the titanium alloy fins (windward side fins B) due to collision, instead of continuing to move forward to the aluminum alloy part behind, which greatly reduces the wear and corrosion of the aluminum alloy fins. Easy to clean: Since the particulate matter is mainly concentrated on the titanium alloy fins, this makes cleaning and maintenance more centralized and simple, thereby improving the maintenance efficiency of the entire heat exchange device.

[0014] In the present invention, the windward fin B made of titanium alloy has a higher temperature resistance and can withstand temperatures up to 450°C, while the temperature resistance of the windward fin A made of aluminum alloy is generally below 250°C. In addition, the density of titanium alloy is 4.5g / cm 3 , while the density of aluminum alloy is lower, which is 2.7g / cm 3 . Based on these physical properties, the utility model constitutes a model of graded heat exchange, that is, the high-temperature air is first treated with a titanium alloy heat dissipation core, and then introduced into the aluminum alloy heat dissipation core for subsequent cooling. Temperature management: By first using a titanium alloy heat dissipation core to treat the high-temperature air, the air temperature can be effectively reduced to a range that the aluminum alloy can withstand. This not only protects the aluminum alloy core from damage due to excessive temperature, but also improves the safety and efficiency of the overall heat exchange system. Weight optimization: Due to the different densities of titanium alloy and aluminum alloy, the utility model can significantly reduce the total weight of the product while ensuring temperature resistance by adjusting the length of the titanium alloy core. This is particularly important for applications in mobile or aviation fields because it can reduce energy consumption and improve maneuverability. Therefore, the utility model realizes an efficient and weight-optimized heat exchange solution. This design not only takes into account the temperature resistance of the material, but also takes into account the practicality and portability of the product, further improving the performance of the product in a variety of application scenarios.

[0015] The present invention adds a ceramic coating to the surface of the titanium alloy fins. This improvement greatly enhances the impact resistance and corrosion resistance of the fins. The ceramic coating has high hardness and impact resistance, so the coating can effectively resist the impact of sand and gravel carried by high-speed airflow on the fins, reduce fin damage, and extend its service life. The ceramic coating is inactive and not easy to react chemically with other substances, which can further enhance the corrosion resistance of titanium alloys, especially in harsh industrial or natural environments. This feature is particularly important. The ceramic coating has good wear resistance, which means that even after long-term use, it is not easy to wear, thereby reducing maintenance frequency and cost. Therefore, the present invention not only improves the physical properties of the titanium alloy fins, but also further broadens the application field of the heat exchange device, especially in situations where extreme environmental challenges need to be addressed, such as chemical industry, aerospace and other fields. This improvement is expected to become a key technological breakthrough.

[0016] The present invention can optimize the design of the corrugated fins based on the air flow rate, so that the sand and gravel that enter with the air are retained at the entrance of the windward side fin B and no longer enter the interior of the core, preventing them from further invading the core component of the heat device, namely the core. Since the particulate matter is mainly concentrated at the entrance, this makes cleaning and maintenance work more centralized and simple. During product maintenance, only the end face needs to be cleaned, and there is no need to go deep into the interior of the heat exchange device for cleaning. By reducing the wear and clogging of the core by particulate matter, the overall service life of the heat exchange device is indirectly extended. Therefore, the present invention not only improves the cleaning efficiency of the heat exchange device through a simple and effective design improvement, but also greatly extends the service life of the equipment. This is of great value for ensuring the long-term operating efficiency of the equipment and reducing operating costs, and is particularly suitable for environments that require frequent cleaning and maintenance.

[0017] Traditionally, the connection between aluminum alloys and titanium alloys requires the addition of a transition section, which often increases the product's volume and weight. The present invention achieves a direct connection between the two through a copper diffusion welded layer or a 3D-printed integrated structure, eliminating unnecessary transition sections and effectively reducing the volume and weight of the entire heat exchange device. This is particularly important for portable devices or applications with strict weight requirements. Reducing material usage also reduces heat loss in this material, improving overall heat exchange efficiency.

[0018] In summary, the present invention provides a low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure suitable for a variety of industrial and civilian fields. At the same time, by optimizing the structure, the utilization rate of materials is improved and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] Example 1. A low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure, see Figure 1 , including an aluminum alloy heat dissipation core 1, the windward end of the aluminum alloy heat dissipation core 1 is connected to a titanium alloy heat dissipation core 2, and the flow channel of the windward side fin A3 of the aluminum alloy heat dissipation core 1 is correspondingly connected to the flow channel of the windward side fin B4 of the titanium alloy heat dissipation core 2.

[0022] The aforementioned windward side fin A3 and the windward side fin B4 are connected via the copper diffusion solder layer 5, or the windward side fin A3 and the windward side fin B4 are formed into an integrated structure by 3D printing.

[0023] The thickness of the aforementioned copper diffusion solder layer 5 is 0.7 to 1 mm.

[0024] The surface of the windward side fin B4 is provided with a ceramic coating.

[0025] The aforementioned windward side fins B4 have a corrugated structure along the air flow direction.

[0026] The length of the windward fin A3 in the air flow direction is 70 to 80 mm.

[0027] refer to Figure 1 A low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure comprises: an aluminum alloy heat dissipation core 1, a titanium alloy heat dissipation core 2, and a copper diffusion welding layer 5. The aluminum alloy heat dissipation core 1 includes windward side fins A3, and the titanium alloy heat dissipation core 2 includes windward side fins B4.

[0028] The titanium alloy heat sink core 2 is constructed from a high-performance titanium alloy, characterized by its strength, toughness, and corrosion resistance. Fins B4 on the windward side of the core optimize aerodynamic performance and improve heat dissipation efficiency. The fin angle is precisely calculated based on wind speed. By adjusting wind speed and fin angle, the ingress of contaminants such as sand and dust into subsequent components is reduced, protecting the surface treatment layer from damage and extending the life of the entire device.

[0029] The windward fins B4 are coated with a ceramic coating to increase the fin surface hardness, improving their impact and wear resistance. The ceramic coating reduces damage to the fin structure caused by dynamic loads caused by high-speed airflow, ensuring the stability and reliability of the radiator during long-term operation.

[0030] In some cases, titanium alloys are replaced with high-temperature alloys or stainless steel to enhance the product's high-temperature resistance. These materials offer enhanced thermal stability and oxidation resistance, exhibiting superior mechanical properties and corrosion resistance in high-temperature environments. This material shift allows the product to withstand higher temperatures, ensuring structural integrity and functionality in extreme thermal environments.

[0031] Furthermore, given that components in different locations may face varying temperature conditions, materials such as aluminum alloy in the rear section are positioned to operate in a cooler environment. This not only fully utilizes the excellent thermal conductivity and light weight of materials like aluminum alloy, but also avoids the risk of performance degradation due to excessive temperatures, thereby improving the overall system's efficiency and reliability. By intelligently selecting and allocating materials with varying performance characteristics, this utility model effectively enhances the product's high-temperature resistance and ensures that each component performs optimally in its respective operating environment.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present invention, and these modifications or replacements should all be included in the protection scope of the present invention.

Claims

1. A low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure, characterized in that: The invention comprises an aluminum alloy heat dissipation core (1), the windward end of the aluminum alloy heat dissipation core (1) is connected to a titanium alloy heat dissipation core (2), and the flow passage of the windward side fin A (3) of the aluminum alloy heat dissipation core (1) is correspondingly connected to the flow passage of the windward side fin B (4) of the titanium alloy heat dissipation core (2).

2. The low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure according to claim 1 is characterized in that: The windward side fin A (3) and the windward side fin B (4) are connected via a copper diffusion solder layer (5), or the windward side fin A (3) and the windward side fin B (4) are formed into an integrated structure by 3D printing.

3. The low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure according to claim 2, characterized in that: The thickness of the copper diffusion solder layer (5) is 0.7-1 mm.

4. The low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure according to claim 1, characterized in that: The surface of the windward side fin B (4) is provided with a ceramic coating.

5. The low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure according to claim 1, characterized in that: The windward side fins B (4) are in a corrugated structure along the air flow direction.

6. The low-altitude aircraft sand-proof and corrosion-resistant combined heat exchange structure according to claim 1, characterized in that: The length of the windward side fin A (3) in the air flow direction is 70 to 80 mm.

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