Arc-shaped radiator for cooling engine bearing cavity thermal insulation gas

Abstract

The invention discloses an arc-shaped radiator for cooling heat insulation gas of a bearing cavity of an engine. The radiator is mainly composed of an upper skin, a lower skin, a mounting base, an air inlet end cover, an air outlet end cover, an air connector, an oil inlet end cover, an oil return end cover, a fuel nozzle, a side skin assembly and a radiator core assembly. Reinforcing ribs are designed on the upper skin, the lower skin and the side skin assembly and used for improving the pressure bearing capacity of the air side of the radiator. The core part of the radiator is of a U-shaped pipe structure, only one end of the core part is fixed to the core end plate, high pressure of the fuel oil cavity is borne, and meanwhile thermal stress deformation of the radiating pipe in the high-temperature environment is effectively released. And the air pipeline inlet and outlet adopts a conical design to reduce the flow resistance loss of the air side. Ribs consistent with the radian of the upper skin and the radian of the lower skin are additionally arranged in the supporting plate to prevent inward-sinking deformation of the welding seam positions of the supporting plate and the skins. The arc-shaped structure is installed on an engine case, bleed air from an engine exchanges heat with fuel oil and then provides low-temperature heat insulation air for an engine bearing cavity, and the service life of a bearing is prolonged.

Description

Technical Field

[0001] This invention relates to an arc-shaped radiator for cooling the insulating gas in the bearing cavity of an engine, belonging to the technical field of engine thermal management systems. Background Technology

[0002] The lubricating oil in the bearing cavity of aero engines has always faced the risk of high-temperature coking and fire. When current engines operate under supersonic conditions, the intake air temperature is at a high level. After being pressurized and heated by the fan and compressor, the insulating gas used to surround the bearing cavity is insufficient to meet the requirements for heat insulation and cooling of the bearing cavity. This leads to overheating of the bearing cavity wall, causing coking and carbon deposits in the lubricating oil, thereby affecting the service life of the bearing. Summary of the Invention

[0003] To address the thermal protection issues of traditional bearing cavities, this invention aims to provide an arc-shaped radiator for cooling the insulating gas in engine bearing cavities. This radiator provides the required insulating gas to the engine bearing cavities, improving the service life of the engine bearings. Furthermore, the radiator is low in manufacturing cost, resistant to high pressure and high temperature, and safe and reliable.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An arc-shaped radiator for cooling insulating gas in an engine bearing cavity, mounted on an arc-shaped engine casing, and comprising: The upper skin and the lower skin are both arc-shaped surface structures, and the upper skin and the lower skin are arranged at intervals in space according to an upper and lower relationship; A side skin assembly, located behind the upper skin and the lower skin, with its upper end connected to the upper skin and its lower end connected to the lower skin. The oil inlet cap and the oil return cap are located in front of the upper skin and the lower skin, and are arranged in an upper and lower relationship. Each of the oil inlet cap and the oil return cap is equipped with a fuel nozzle. Mounting brackets, at least two of which are mounted on the side skin assembly, and the other is mounted on the oil inlet end cap or the oil return end cap; An air inlet end cap and an air outlet end cap are provided. The air inlet end cap is installed on the left side of the upper skin and the lower skin, and the air outlet end cap is installed on the right side of the upper skin and the lower skin. An air inlet is provided on the air inlet end cap, and an air outlet is provided on the air outlet end cap. A radiator core assembly is assembled within the space surrounded by an upper skin, a lower skin, side skin assemblies, an air inlet end cap, and an air outlet end cap. The radiator core assembly includes a core end plate, heat dissipation pipes, a support plate, ribs, spacer tubes, and reinforcing rods. The core end plate is located on the end face of the radiator core assembly away from the side skin assembly, and multiple reinforcing rods are also installed on the core end plate; Multiple support plates are arranged at intervals from one side of the core end plate until they approach the side skin assembly, and a reinforcing rod runs through all the support plates. The upper and lower ends of the support plates are connected to the upper skin and the lower skin, respectively, and ribs are installed at the connection points. The ribs are not connected to the upper skin and the lower skin. A spacer tube is provided between adjacent support plates, and the spacer tube is sleeved on the reinforcing rod. The heat dissipation pipe is a U-shaped pipe that passes through multiple support plates. The U-shaped open end of the heat dissipation pipe is connected to the core end plate, and the U-shaped closed end is close to the side skin assembly and is in a suspended and free state.

[0005] As one option, the upper skin, lower skin, and side skin assembly are uniformly provided with reinforcing ribs, which are in the shape of arcs.

[0006] As one option, the surface of the mounting base that connects with the side skin assembly, the oil inlet end cap, and the oil return end cap is a rounded transition surface. The mounting base has a pre-reserved vent hole, and the surface of the mounting base is provided with through holes for mounting bolts.

[0007] As one option, the air inlet end cap and the air outlet end cap are also provided with mounting bases, and both the air inlet and the air outlet adopt a conical structure.

[0008] As one option, both the air inlet of the air inlet end cover and the air outlet of the air outlet end cover are equipped with air connectors, and the air connectors are fitted with the engine using a convex-concave joint, with a sealing ring in the middle, and the connectors are fixed together by clamps.

[0009] As one solution: The oil inlet end cap is provided with a reinforcing rib in the middle; The oil outlet cap is provided with a reinforcing rib in the middle.

[0010] As one option, the side skin assembly has multiple spaced-apart baffles on the surface of the side corresponding to the radiator core assembly.

[0011] As one embodiment, the radiator core assembly, upper skin, lower skin, mounting base, air inlet end cap, air outlet end cap, air connector, oil inlet end cap, oil return end cap, fuel nozzle, and side skin assembly are argon arc welded.

[0012] This invention provides an arc-shaped radiator for cooling the gas inside the heat insulation layer of an engine bearing cavity. It utilizes the high-temperature and high-pressure gas after the engine starts working, pre-cools the gas through the arc-shaped radiator, and uses the cooled gas as cooling and heat insulation gas in the bearing cavity to protect the lubrication system in the bearing cavity. This prevents the lubricating oil from coking and failing due to high temperature, and also provides a sealing function to prevent lubricating oil leakage and the intrusion of high-temperature combustion gases.

[0013] Compared with the prior art, the present invention makes full use of the airborne heat sink and uses fuel as the cooling medium to improve the cooling quality of the bearing cavity insulation gas, so as to achieve the purpose of heat insulation protection of the bearing cavity. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the arc-shaped heat sink of the present invention; Figure 2 for Figure 1 The main view; Figure 3 for Figure 1 Attached view; Figure 4 for Figure 1 The right view; Figure 5 for Figure 1 The left view; Figure 6 This is a schematic diagram of the upper and lower skin layers; Figure 7 This is a schematic diagram of the side skin assembly; Figure 8 Schematic diagram of air inlet end cap and air outlet end cap; Figure 9 This is a schematic diagram of an air connector; Figure 10 This is a schematic diagram of a fuel nozzle; Figure 11 This is a schematic diagram of the oil inlet end cap; Figure 12 This is a schematic diagram of the oil outlet cap; Figure 13 This is a schematic diagram of the heat sink core assembly; Figure 14 This is a partial sectional view of the support plate and the upper skin. In the diagram: 1. Upper skin, 2. Lower skin, 3. Mounting base, 4. Air inlet end cap, 5. Air outlet end cap, 6. Air connector, 7. Oil inlet end cap, 8. Oil return end cap, 9. Fuel nozzle, 10. Side skin assembly, 11. Radiator core assembly, 12. Core end plate, 13. Radiator pipe, 14. Support plate, 15. Rib, 16. Spacer tube, 17. Reinforcing rod, 18. Wind deflector. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0016] The engine is used in high-speed aircraft. At high Mach speeds, the temperature of the incoming air exceeds 300°C, and the temperature of the air after being compressed by the engine compressor reaches 600°C. This causes the outer periphery of the engine bearing cavity to be surrounded by hot air. The arc-shaped radiator of this invention aims to cool the hot air surrounding the bearing cavity, thereby providing heat insulation and protection for the bearing cavity and improving the service life of the bearing.

[0017] like Figures 1 to 14 The present invention provides an arc-shaped radiator for cooling the heat insulation gas in the bearing cavity of an engine, comprising an upper skin 1, a lower skin 2, a mounting base 3, an air inlet end cap 4, an air outlet end cap 5, an air connector 6, an oil inlet end cap 7, an oil return end cap 8, a fuel nozzle 9, a side skin assembly 10, and a radiator core assembly 11.

[0018] The upper skin 1 and lower skin 2 adopt an arc surface structure to match the arc-shaped engine casing. At the same time, to ensure strength, reinforcing ribs are evenly arranged on the skin. The reinforcing ribs are semi-circular arcs and their main function is to fix the radiator core assembly 11 and support the cavity part of the entire air flow area. They are the main pressure-bearing components on the air side.

[0019] The upper skin 1 adopts the same curvature design as the engine casing. The skin thickness is designed to be 1.2mm. Reinforcing ribs are added to the skin to ensure its strength. Its main function is to collect and rectify air. Together with the lower skin 2, it is fixed together with the radiator core assembly to form the whole product.

[0020] The lower skin 2 has an arc-shaped casing mounting surface on its lower side. Its structural design principle is the same as that of the upper skin 1. The thickness is 1.2mm and it is equipped with reinforcing ribs.

[0021] The surfaces of the mounting base 3 that connect with the side skin assembly 10 and the oil inlet cap 7 are rounded (the rounded transition mainly facilitates welding). The mounting base 3 has pre-drilled vent holes (the mounting base 3 is connected to the side skin assembly 10 and the oil inlet cap 7 via argon arc welding; the vent holes are designed to remove residual air and moisture from the mounting base 3's cavity during argon arc welding. Without vent holes, the high temperature during welding will cause these gases to expand, and the unexpelled gases will form pores in the weld, affecting weld quality). The surface of the mounting base 3 has through holes for mounting bolts, and it is installed using a welding method. The mounting base 3 has pre-drilled vent holes, and the two mounting bases 3 are connected to the side skin assembly 10 and the oil inlet cap 7 respectively via argon arc welding. Their surfaces have Φ6.5mm through holes, and the radiator is fixed to the engine casing with bolts. The mounting base 3 serves to secure the entire product. The mounting base 3 is a separate part. Figure 2 In the middle, the lower side of the corresponding mounting base 3 is a machined flat surface, which is used for fixed installation with the upper surface of the aircraft.

[0022] The air inlet end cap 4 and the air outlet end cap 5 are machined as a whole with the mounting base and end cap as an integrated unit. They are transition parts between the radiator core assembly 11 and the air pipeline. They mainly serve to collect and transport high-temperature and high-pressure air. At the same time, in order to reduce the flow resistance loss inside the air side, both the air inlet and the air outlet adopt a conical structure with a minimum inner diameter of φ72mm.

[0023] The air inlet end cap 4 is the air-side inlet, whose main function is to connect with the system pipeline and transport high-temperature and high-pressure air. The whole is machined and has added air-side installation positions (3 mounting bases). In order to reduce the internal flow resistance loss of the air side, the air inlet adopts a conical structure.

[0024] The air outlet end cap 5 is the air-side outlet, whose main function is to connect with the system pipeline and transport high-temperature and high-pressure air. The whole is machined and has added air-side installation positions (3 mounting bases). In order to reduce the internal flow resistance loss of the air side, the air outlet adopts a conical structure.

[0025] Air connector 6 is designed according to HB 6879-93 "High-Temperature Conduit Connection with Sealing Ring - Quick-Release Clamp Parts", and is connected to the air inlet end cap 4 and the air outlet end cap 5 by argon arc welding. Air inlet and outlet connectors of the radiator (such as...) Figure 9 Two types of air connectors 6) are used, with a male and female connector mating with the engine, and a flexible graphite PS-1 sealing ring in the middle. The connectors are fixed together with clamps. The air inlet uses a male connector 6, and the air outlet uses a female connector 6 to prevent errors. The nominal diameter of the air inlet and outlet connectors is φ72mm.

[0026] The fuel inlet cap 7 serves as the fuel inlet channel and connects the radiator core assembly 11 to the fuel nozzle 9. Its main function is to transport and collect fuel, isolating hot and cold fuel to form two chambers, allowing fuel to flow into the radiator core assembly 11. To improve the pressure resistance and strength of the fuel inlet cap 7, reinforcing ribs are provided in the middle of the cap. The fuel inlet cap 7 is connected to the radiator core assembly 11 by argon arc welding.

[0027] The fuel outlet cap 8 serves as the fuel outlet channel and connects the radiator core assembly 11 and the fuel nozzle 9. Its main function is to transport and collect fuel, isolating hot and cold fuel to form two chambers, allowing fuel to flow back to the fuel outlet. The fuel return cap 8 is connected to the radiator core assembly 11 by argon arc welding and also serves as a pressure-bearing structure within the radiator cavity. To ensure welding quality, the fuel return cap 8 is welded separately from the fuel inlet cap 7. After the fuel inlet cap 7 is welded to the radiator core assembly 11, it is then welded to the fuel return cap 8.

[0028] Fuel nozzle 9 is a fuel inlet / outlet nozzle, which is connected to the main engine pipeline by a thread. Fuel enters the radiator core assembly 11 through the opening of the U-shaped cooling pipe 13 via the fuel inlet nozzle 9, and then changes direction through the U-shaped bend before reaching the return end cap 8 and returning to the fuel outlet nozzle 9. The diameter of the fuel inlet / outlet nozzle 9 is φ22mm.

[0029] The side skin assembly 10 is mainly composed of a side skin and a wind baffle 18, which are argon arc welded together. The wind baffle 18 is mainly used for air-side gas turbulence to improve the heat exchange efficiency of the radiator. To improve strength, the side skin assembly 10 is uniformly equipped with reinforcing ribs, which are semi-circular in shape.

[0030] The radiator core assembly 11 consists of a core end plate 12, a heat dissipation pipe 13, a support plate 14, ribs 15, a spacer tube 16, and reinforcing rods 17. The heat dissipation pipe 13 is vacuum brazed to the core end plate 12. The support plate 14 is circumferentially welded to the upper skin 1 and the lower skin 2 by argon arc welding, and ribs 15 are spot-welded to prevent inward deformation after welding. The support plate 14 is fixed axially by the spacer tube 16. One end of the reinforcing rod 17 is fixed to the core end plate 12 by threads, and the other end passes through all the support plates 14. In this embodiment, three reinforcing rods 17 are used. The spacer tubes 16 between adjacent support plates 14 are sleeved on the reinforcing rods 17. The length of the reinforcing rod 17 is the overall length connecting all the support plates 14. It has two functions: first, to install the spacer tubes 16, that is, the spacer tubes 16 are sleeved on the reinforcing rods 17 to ensure the assembly spacing between the support plates 14; second, to fix and support all the support plates 14. The radiator tube 13 is made of high-temperature resistant stainless steel and bent into a U-shape using special tooling. After the radiator core assembly 11 is assembled, it is clamped using a special fixture and then brazed in a vacuum brazing furnace. Under high temperature, the inlet and outlet ends of the U-shaped tube are connected to the core end plate 12. The welding quality is checked after brazing. The radiator tube 13 adopts a U-shaped design with one end fixed and the other end free, which effectively releases the thermal stress deformation of the radiator tube 13 caused by the high temperature environment.

[0031] The main processing method for the arc-shaped radiator used to cool the engine bearing cavity insulation air is as follows: The arc-shaped radiator is mainly composed of radiator core assembly 11, upper skin 1, lower skin 2, mounting base 3, air inlet end cap 4, air outlet end cap 5, air connector 6, oil inlet end cap 7, oil return end cap 8, fuel nozzle 9, and side skin assembly 10, all welded together by argon arc welding. The air connector 6 at the air inlet and outlet is connected to the engine piping using clamps; the fuel nozzle 9 at the fuel inlet and outlet is connected to the engine piping using threads; the radiator is installed by bolts to the engine casing via mounting base 3. The main processes involved in the radiator include machining, sheet metal forming, argon arc welding, and post-weld machining. The radiator is mainly made of non-flammable, non-explosive, corrosion-resistant, and mildew-resistant high-temperature alloys and stainless steel.

[0032] like Figure 6 As shown, the upper skin 1 and lower skin 2 adopt an arc-shaped structure, with reinforcing ribs evenly distributed on the skin. These ribs are arc-shaped, with the curvature consistent with that of the upper skin 1, lower skin 2, and support plate 14. Figure 13 As shown, the upper skin 1 and lower skin 2 are welded together with the support plate 14 to fix the entire radiator core assembly 11 and withstand the high-temperature and high-pressure gas from the air side. Figure 13 As shown, a rib 15 is added at the same time as the support plate 14 is welded to the upper skin 1. The rib 15 is spot welded to the support plate 14. The rib 15 does not directly contact the upper skin 1, in order to prevent the upper skin 1 and the lower skin 2 from sinking and deforming after welding.

[0033] like Figure 7 As shown, the side skin assembly 10 is mainly connected to the upper skin 1, lower skin 2, air inlet end cap 4, and air outlet end cap 5 by argon arc welding. It is a side protection part of the air cavity. Its surface is provided with a wind baffle 18 and reinforcing ribs. Its main function is to withstand high temperature and high pressure air, as well as turbulence.

[0034] like Figure 8 As shown, the air inlet end cap 4 and the air outlet end cap 5 are welded together with the radiator core assembly 11 by argon arc welding. They mainly serve to collect and transport high-temperature and high-pressure air. At the same time, in order to reduce the flow resistance loss inside the air side, both the air inlet and the air outlet adopt a conical structure.

[0035] like Figure 9 As shown, air connector 6 comes in two forms as air inlet / outlet connectors: a concave connector on the left and a convex connector on the right. These are installed at the air outlet and air inlet, respectively. The radiator's air inlet / outlet connectors mate with the engine piping using a convex / concave connector, with a flexible graphite PS-1 sealing ring in the middle. The connectors are secured together with clamps. The air inlet uses a convex connector, and the air outlet uses a concave connector to prevent errors. The nominal diameter of the air inlet / outlet connector is φ72mm.

[0036] like Figure 10 As shown, fuel nozzle 9 is the fuel inlet / outlet nozzle, which is connected to the main engine pipeline by a thread. Fuel is supplied through the fuel inlet nozzle, which has a diameter of φ22mm.

[0037] like Figure 11 and Figure 12 As shown, the oil inlet cap 7 and the oil return cap 8 are connected to the radiator core assembly 11 by argon arc welding. The oil inlet cap 7 and the oil return cap 8 have mounting holes for fuel nozzles 9 and a reinforcing rib in the middle.

[0038] like Figure 13 As shown, the radiator core assembly 11 mainly consists of a core end plate 12, heat dissipation pipes 13, a support plate 14, ribs 15, spacer tubes 16, and reinforcing rods 17. The heat dissipation pipes 13 are vacuum brazed to the core end plate 12. The heat dissipation pipes 13 are U-shaped. Figure 13 The process is not fully shown in the figure. It mainly avoids thermal stress deformation of the heat sink tube 13 caused by the high temperature environment of the air cavity by brazing one end to the heat sink core end plate 12 and leaving the other end free.

[0039] This invention is mounted on an arc-shaped engine casing and secured with bolts, making assembly and disassembly simple. The mounting base 3 is arranged on the radiator via argon arc welding. To match the fixing method of the engine casing, the upper skin 1 and lower skin 2 of the radiator adopt an arc-shaped structure. Furthermore, to improve the overall strength of the radiator air cavity, reinforcing ribs are evenly distributed on the surfaces of the upper skin 1 and lower skin 2. To address the issue of the radiator tube 13 operating at high temperatures, a U-shaped tube is used. The inlet and outlet of the radiator tube 13 are welded and fixed at the core end plate 12, while the U-shaped bend is completely free, preventing damage and leakage of the radiator tube 13 due to temperature-induced deformation. Since the radiator on the engine faces extremely severe vibration loads, this invention uses seven layers of support plates 14 to support and reinforce the U-shaped radiator tube 13. Additionally, ribs 15 are provided at the contact points between the support plates 14 and the upper and lower skins 1 and 2 to prevent the upper and lower skins 1 and 2 from inward deformation after argon arc welding.

[0040] The radiator of this invention improves the machinability of the parts and reduces manufacturing costs. The arc-shaped radiator has advantages such as high pressure resistance, high temperature resistance, safety, and reliability, and is used to solve the problem of excessively high air temperature in the heat insulation jacket of the engine bearing cavity.

[0041] The working principle of the arc-shaped radiator in this invention is as follows: it adopts a cross-flow layout, and the heat dissipation pipe 13 adopts a U-shaped tube form. It uses the low-temperature and high-pressure fuel on the engine to cool the high-temperature and high-pressure air after the engine has been working and has been introduced into the heat insulation jacket of the bearing cavity to achieve the purpose of protecting the lubrication system in the bearing cavity.

[0042] Those skilled in the art can make various adjustments to this application based on the actual circumstances. The general principles defined in this application can be implemented in other embodiments without departing from their connotations. Therefore, this application is not limited to the structure shown in the specific embodiments, but is to be accorded the widest scope consistent with the principles and features set forth in the claims of this application.

Claims

1. An arc-shaped radiator for cooling insulating gas in an engine bearing cavity, characterized in that, It is mounted on the arc-shaped casing of the engine and includes: Upper skin (1) and lower skin (2), both of which are arc-shaped surface structures, and the upper skin (1) and lower skin (2) are arranged in space according to an upper and lower relationship; Side skin assembly (10), the side skin assembly (10) is located behind the upper skin (1) and the lower skin (2), the upper end of the side skin assembly (10) is connected to the upper skin (1), and the lower end of the side skin assembly (10) is connected to the lower skin (2). Oil inlet cap (7) and oil return cap (8) are located in front of the upper skin (1) and the lower skin (2) and are arranged in an upper and lower relationship. Each of the oil inlet cap (7) and the oil return cap (8) is equipped with a fuel nozzle (9). Mounting seat (3), there are at least two mounting seats (3), one of which is mounted on the side skin assembly (10) and the other is mounted on the oil inlet end cap (7) or the oil return end cap (8); An air inlet end cap (4) and an air outlet end cap (5) are provided. The air inlet end cap (4) is installed on the left side of the upper skin (1) and the lower skin (2), and the air outlet end cap (5) is installed on the right side of the upper skin (1) and the lower skin (2). An air inlet is provided on the air inlet end cap (4), and an air outlet is provided on the air outlet end cap (5). A radiator core assembly (11) is assembled within the space surrounded by an upper skin (1), a lower skin (2), a side skin assembly (10), an air inlet end cap (4), and an air outlet end cap (5). The radiator core assembly (11) includes a core end plate (12), a heat dissipation pipe (13), a support plate (14), a rib (15), a spacer tube (16), and a reinforcing rod (17), wherein: The core end plate (12) is located on the end face of the radiator core assembly (11) away from the side skin assembly (10), and multiple reinforcing rods (17) are also installed on the core end plate (12). Multiple support plates (14) are arranged at intervals from one side of the core end plate (12) until they approach the side skin assembly (10), and a reinforcing rod (17) runs through all the support plates (14). The upper and lower ends of the support plates (14) are connected to the upper skin (1) and the lower skin (2) respectively, and a rib (15) is installed at the connection. The rib (15) is not connected to the upper skin (1) and the lower skin (2). A spacer tube (16) is provided between adjacent support plates (14), and the spacer tube (16) is sleeved on the reinforcing rod (17). The heat dissipation pipe (13) is a U-shaped pipe that passes through multiple support plates (14). The U-shaped open end of the heat dissipation pipe (13) is connected to the core end plate (12), and the U-shaped closed end is close to the side skin assembly (10) and is in a suspended and free state.

2. An arc-shaped radiator for cooling the insulating gas in an engine bearing cavity according to claim 1, characterized in that: The upper skin (1), lower skin (2) and side skin assembly (10) are uniformly provided with reinforcing ribs, which are in the shape of arcs.

3. An arc-shaped radiator for cooling insulating gas in an engine bearing cavity according to claim 1, characterized in that: The surface of the mounting base (3) that connects with the side skin assembly (10), the oil inlet end cap (7) and the oil return end cap (8) is a rounded transition surface. The mounting base (3) has a reserved vent hole and a through hole for mounting bolts is provided on the surface of the mounting base (3).

4. An arc-shaped radiator for cooling the insulating gas in an engine bearing cavity according to claim 1, characterized in that: The air inlet end cap (4) and air outlet end cap (5) are also provided with mounting bases, and both the air inlet and air outlet adopt a conical structure.

5. An arc-shaped radiator for cooling insulating gas in an engine bearing cavity according to claim 4, characterized in that: Air connectors (6) are installed on the air inlet of the air inlet end cover (4) and the air outlet of the air outlet end cover (5). The air connectors (6) are fitted with the engine using a convex-concave joint, with a sealing ring in the middle and clamps used to fix the connectors together.

6. An arc-shaped radiator for cooling insulating gas in an engine bearing cavity according to claim 1, characterized in that: The oil inlet end cap (7) is provided with a reinforcing rib in the middle; The oil outlet cap (8) is provided with a reinforcing rib in the middle.

7. An arc-shaped radiator for cooling insulating gas in an engine bearing cavity according to claim 1, characterized in that: The side skin assembly (10) has multiple spaced baffles (18) on the surface of the side corresponding to the radiator core assembly (11).

8. An arc-shaped radiator for cooling insulating gas in an engine bearing cavity according to claim 1, characterized in that: The radiator core assembly (11), upper skin (1), lower skin (2), mounting base (3), air inlet end cap (4), air outlet end cap (5), air connector (6), oil inlet end cap (7), oil return end cap (8), fuel nozzle (9), and side skin assembly (10) are argon arc welded.

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