Ducted air-lubricating oil heat exchanger

Abstract

The duct air-lubricating oil heat exchanger comprises a group of heat exchange units which are arranged in a circumferential mode, and each heat exchange unit comprises an outer duct upper cover plate, an outer duct lower cover plate, a duct supporting plate and a heat exchange core body which are composed of duct inner walls; an annular oil conveying pipe is arranged outside the heat exchange unit, and a lubricating oil inlet pipe and a lubricating oil outlet pipe are arranged on the oil conveying pipe; the heat exchange core body is fixedly arranged in a space formed by the outer culvert upper cover plate, the outer culvert lower cover plate and the duct supporting plate; the heat exchange core body comprises fixed fins, a heat transfer pipe, a bent pipe and a fin plate, the heat transfer pipe is connected with the bent pipe, the end part of the heat transfer pipe is connected with the oil conveying pipe through a lubricating oil connecting pipe, the fixed fins are arranged at the end part of the heat transfer pipe, and the fin plate is sleeved on the heat transfer pipe. The fins are arranged in a staggered mode, the heat transfer efficiency is improved, the detachable and cleaning functions are achieved, remarkable progress is made in the aspects of improving the lubricating oil cooling effect, reducing the air flowing resistance and enhancing the structural strength, and the heat exchanger is suitable for modern high-performance aircrafts.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft heat exchangers, and in particular to a ducted air-lubricating oil heat exchanger installed in an aircraft duct. Background Art

[0002] When an aircraft is flying at high altitude, the operating efficiency and reliability of the engine are crucial, and the normal operation of the engine is highly dependent on its internal lubricating oil system. The lubricating oil system not only plays a lubricating role, but also undertakes the key function of cooling the various high-temperature components of the engine. Especially in modern high-performance aircraft, the engine often operates under extreme conditions, and the temperature regulation of the lubricating oil becomes more important. Traditional lubricating oil heat exchangers mainly cool the lubricating oil through the air outside the aircraft. However, with the continuous development of aircraft design and the improvement of performance, heat exchanger design faces a series of challenges and limitations.

[0003] Traditional heat exchanger structures mostly use simple fin or tube bundle designs. Although they can achieve a certain degree of heat exchange, they often fail to fully utilize the high-speed airflow in the duct. This simple design has low heat exchange efficiency in high-altitude, low-density air environments and cannot meet the needs of the new generation of aircraft for efficient heat exchange.

[0004] At the same time, although the traditional fin heat exchanger increases the heat exchange area, it is often accompanied by a large pressure drop due to design limitations, which has an adverse effect on the efficiency of aircraft engines. How to improve the efficiency of the heat exchanger without increasing the pressure drop is one of the urgent problems to be solved in the current heat exchanger design.

[0005] To address these issues, it is necessary to develop a heat exchanger with an innovative structural design to improve the overall performance and reliability of modern aircraft. Summary of the invention

[0006] The purpose of the present invention is to provide a ducted air-oil heat exchanger which, through optimized design, improves heat exchange efficiency, reduces pressure drop, and enhances the strength and reliability of the overall structure to meet the needs of modern aircraft and is suitable for use in aircraft ducts.

[0007] To achieve the above purpose, the technical solution of the present invention is as follows:

[0008] A ducted air-lubricating oil heat exchanger, characterized in that it comprises a group of heat exchange units arranged in a circle, the heat exchange units comprising an outer duct upper cover plate, an outer duct lower cover plate, a duct support plate and a heat exchange core formed by the inner wall of the duct; an annular oil pipeline is provided outside the heat exchange unit, and a lubricating oil inlet pipe and a lubricating oil outlet pipe are provided on the oil pipeline; the heat exchange core is fixedly arranged in a space formed by the outer duct upper cover plate, the outer duct lower cover plate and the duct support plate; the heat exchange core comprises fixed fins, heat transfer tubes, elbows and fin plates, the heat transfer tubes and the elbows are connected, the ends of the heat transfer tubes are connected to the oil pipeline through lubricating oil connecting pipes, the fixed fins are arranged at the ends of the heat transfer tubes, and the fin plates are sleeved on the heat transfer tubes.

[0009] Preferably, the lubricating oil inlet pipe and the lubricating oil outlet pipe are connected to the aircraft lubricating oil system. The lubricating oil inlet pipe is in the opposite direction to the air side.

[0010] Preferably, the heat exchange units are provided with lubricating oil inlets and outlets which are connected to the oil pipeline via nuts.

[0011] Preferably, the heat exchange unit is formed by the heat exchange core and the duct upper cover plate being matched through nuts to achieve a detachable function.

[0012] Preferably, a fixing slot is provided at the lower portion of the heat exchange unit, which cooperates with the fixing fins of the heat exchange core to fix the position of the heat exchange core.

[0013] Preferably, a heat transfer tube is arranged inside the heat exchange core, and a plurality of groups of staggeredly arranged fins are arranged on the heat transfer tube.

[0014] Preferably, a plurality of heat transfer tubes and bent tubes are arranged inside the heat exchange core and connected by welding. Lubricating oil flows through the heat transfer tubes and exchanges heat with the external air.

[0015] Preferably, micrometer columns are provided on the fin plates to destroy the boundary layer of air on the fin surface and enhance the heat transfer effect.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention arranges multiple heat exchange units in an array form, and the lubricating oil flows evenly through each heat exchange unit, which significantly improves the heat exchange efficiency.

[0018] 2. The present invention makes the cooperation between the heat exchange core and the heat exchange unit flexible through the cooperation between the slot and the nut, and facilitates the disassembly and cleaning of the core.

[0019] 3. The present invention sets staggered fin plates on the outside of the heat exchange tube, which is different from the traditional uniform fin design. The staggered arrangement can increase the flow disturbance of air on the surface of the heat exchange tube, break the laminar state of the airflow, and thus enhance the heat transfer effect. At the same time, this design also effectively reduces the resistance of the airflow when it flows through the heat exchanger, improving the overall efficiency of the system.

[0020] 4. The present invention adds a micron column structure on the surface of the fin plate. The micron column promotes full contact between air and fins by destroying the boundary layer formed on the fin surface, thereby improving the heat transfer efficiency. The micron column structure can also enhance the turbulence of the airflow, making the heat exchange process more efficient. In addition, the structure is simple in design and easy to manufacture, which can effectively improve the overall performance of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the heat exchange unit of the ducted air-lubricating oil heat exchanger of the present invention;

[0023] Figure 3 Schematic diagram of the core structure of the ducted air-lubricating oil heat exchanger of the present invention;

[0024] Figure 4 is a schematic diagram of the fin structure of the present invention;

[0025] Figure markings, 1-lubricating oil outlet pipe; 2-lubricating oil inlet pipe; 3-oil delivery pipe; 4-heat exchange unit; 5-duct support plate; 6-lubricating oil connecting pipe; 7-connecting nut; 8-fixing slot; 9-heat exchange core; 10-outer culvert upper cover plate; 11-outer culvert lower cover plate; 12-fixed fin; 13-heat transfer tube; 14-bend pipe; 15-fin plate; 16-micrometer column. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention is further described in detail below in combination with the drawings and specific embodiments.

[0027] The ducted air-lubricating oil heat exchanger provided by the present invention can achieve the purpose of efficient heat exchange and reduce air flow resistance.

[0028] See also Figures 1 to 4A ducted air-lubricating oil heat exchanger is suitable for use in an aircraft duct, comprising a group of heat exchange units 4 arranged in a circle, the heat exchange units comprising an outer duct upper cover plate 10, an outer duct lower cover plate 11, a duct support plate 5 and a heat exchange core 9 formed by the inner wall of the duct; an annular oil pipeline 3 is provided outside the heat exchange unit 4, and an oil inlet pipe 2 and an oil outlet pipe 1 are provided on the oil pipeline 3; the heat exchange core 9 is fixedly arranged in a space formed by the outer duct upper cover plate 10, the outer duct lower cover plate 11 and the duct support plate 5; the heat exchange core 9 comprises a fixed fin 12, a heat transfer pipe 13, a bend pipe 14 and a fin plate 15, the heat transfer pipe and the bend pipe are connected, the end of the heat transfer pipe is connected to the oil pipeline 3 through a lubricating oil connecting pipe 6, the fixed fin 12 is arranged at the end of the heat transfer pipe 13, and the fin plate 15 is sleeved on the heat transfer pipe 13.

[0029] The oil enters the heat exchanger through the oil inlet pipe 2 and flows out through the oil outlet pipe 1. The oil inlet pipe and the air side are in opposite directions. The oil inlet pipe and the oil outlet pipe are connected to the aircraft oil system to ensure that the oil circulates inside the heat exchanger. At the same time, the oil delivery pipe and the oil connecting pipe are used to evenly distribute the oil from the inlet to each heat exchange unit 4. The oil delivery pipeline is designed to be able to withstand high pressure and high temperature to ensure that the oil will not leak or lose pressure during the flow process.

[0030] The heat exchange unit shell is composed of the duct upper cover plate 10, the duct lower cover plate 11 and the duct support plate 5. The design of the duct support plate not only ensures that the heat exchanger can be installed stably, but also guides the airflow through the heat exchanger for effective cooling. The upper and lower covers of the outer culvert are used to seal and protect the external structure of the heat exchanger, and can also be built based on the structure of the aircraft outer culvert itself.

[0031] The heat exchange core is connected to the heat exchange unit shell through nuts and fixed slots. The fixed slots are used to fix the position of the heat exchange core to prevent the core from loosening or shifting due to vibration or airflow impact during flight. The design of the slots takes into account the thermal expansion and contraction characteristics of the material to ensure that the fins remain stable in various flight environments.

[0032] The heat exchange unit 4 has a lubricating oil inlet and outlet connected to the oil pipeline through nuts. The heat exchange unit 4 is formed by the heat exchange core 9 and the duct upper cover plate 10 through the connection nuts 7 to achieve a detachable function.

[0033] Preferably, a heat transfer tube is arranged inside the heat exchange core, and a plurality of groups of staggeredly arranged fins are arranged on the heat transfer tube.

[0034] Preferably, a plurality of heat transfer tubes and bent tubes are arranged inside the heat exchange core and connected by welding. Lubricating oil flows through the heat transfer tubes and exchanges heat with the external air.

[0035] Each heat exchange core 9 is provided with a heat transfer tube 13 and a bend 14, through which the lubricating oil flows. A fin plate 15 is welded to the outside of the heat transfer tube. A group of fin plates are arranged in a staggered manner and mounted on the heat transfer tube. Air flows from the outside through the surface of the fin plate and exchanges heat with the lubricating oil in the heat transfer tube. The fin plates on the surface of the heat exchange tube are designed in a staggered arrangement, so that the airflow produces complex disturbances on the fin surface, thereby enhancing the heat transfer effect. Micron columns 16 are provided on the surface of the fin plate. These micron columns can destroy the boundary layer formed by the airflow on the fin surface, further improving the heat transfer efficiency.

[0036] The heat exchange core is provided with fixed fins 12 at both ends, one end is located at the heat transfer tube 13, and the other end is located at the elbow 14. The fixed fins 12 cooperate with the fixed slots 8 of the heat exchange unit to fix the position of the heat exchange core 9.

[0037] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0038] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A ducted air-lubricating oil heat exchanger, characterized in that: The invention comprises a group of heat exchange units (4) arranged in a circumferential manner, wherein the heat exchange units (4) comprise an outer culvert upper cover plate (10) formed by the inner wall of the culvert, an outer culvert lower cover plate (11), a culvert support plate (5) and a heat exchange core (9); an annular oil delivery pipe (3) is arranged outside the heat exchange unit (4), and a lubricating oil inlet pipe (2) and a lubricating oil outlet pipe (1) are arranged on the oil delivery pipe (3); the heat exchange core (9) is fixedly arranged on the outer culvert upper cover plate (10), the outer culvert lower cover plate (11), the culvert support plate (5) and a heat exchange core (9) The heat exchange core (9) comprises fixed fins (12), heat transfer tubes (13), elbows (14) and fin plates (15); the heat transfer tubes (13) and elbows (14) are connected; the ends of the heat transfer tubes (13) are connected to the oil delivery pipe (3) through lubricating oil connecting pipes (6); the fixed fins (12) are arranged at both ends of the heat exchange core (9); and the fin plates (15) are sleeved on the heat transfer tubes (13).

2. The ducted air-oil heat exchanger according to claim 1, characterized in that: The lubricating oil inlet pipe (2) and the lubricating oil outlet pipe (1) are connected to the aircraft lubricating oil system.

3. The ducted air-oil heat exchanger according to claim 1, characterized in that: A fixed slot (8) is provided in the heat exchange unit (4), and the heat exchange core (9) is fixedly arranged in the fixed slot (8).

4. The ducted air-oil heat exchanger according to claim 3, characterized in that: The heat exchange unit (4) and the heat exchange core (9) are connected by means of a connecting nut (7) and a fixing slot (8).

5. The ducted air-oil heat exchanger according to claim 1, characterized in that: Micron columns (16) are provided on the surface of the fin plate (15).

6. The ducted air-oil heat exchanger according to claim 1, characterized in that: A group of fin plates (15) are arranged in a staggered manner and are sleeved on the heat transfer tube (13).

7. The ducted air-oil heat exchanger according to claim 1, characterized in that: The heat transfer tube (13) is connected to the elbow (14) by welding.

8. The ducted air-oil heat exchanger according to claim 1, characterized in that: The heat exchange unit (4) is a detachable structure that facilitates the cleaning and maintenance of the heat exchange core (9).

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