Engine duct-shaped radiator with bypass function

Abstract

The present application belongs to the technical field of aero-engine lubricating oil system, and particularly relates to an engine duct special-shaped radiator with a bypass function. The special-shaped radiator device is installed on the engine outer duct, the radiator core body is integrally installed with the engine casing, the functions of the radiator and the outer duct casing are combined, the radiator device serves as a part of the engine duct and also serves the purpose of cooling lubricating oil, the air side fins are integrated with the radiator core body, the thermal resistance is reduced, and the thermal conductivity of the air side fins and the core body is improved, the side plate of the radiator is made of a sheet metal stamping part, the liquid collecting cavity and the differential pressure bypass valve flow channel are integrally stamped and formed, the number of parts and the number of argon arc welding seams are reduced, and the reliability of the product is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of aero-engine lubricating oil systems, and particularly relates to an engine duct shaped radiator with bypass function. Background Technology

[0002] Traditional air-to-oil coolers are typically mounted on the engine accessory housing and are mostly rectangular or other regular shapes. They have air ducts on the air side and use ejectors or fans to draw in ambient air to achieve forced convection heat transfer, thus cooling the hot fluid on the engine side. Traditional air-to-oil coolers generally have high air-side flow resistance and occupy a large space on the engine, failing to meet the engine's requirements for conformal structure and low compensatory losses. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings and defects in the current technology of aero-engines, which require high-altitude operation, long flight time, high efficiency, low flow resistance, and conformal structure, by providing an engine duct shaped radiator with bypass function. This radiator integrates the heat dissipation core and the outer bypass casing into a single arc-shaped structure, mounted on the engine's outer bypass duct. This significantly reduces the space required for engine accessories while fully utilizing the heat sink in the outer bypass duct, thus minimizing engine compensation losses. The air-side fins of this radiator are formed by profile extrusion, resulting in high processing and heat exchange efficiency. The oil-side fins use rectangular serrated fins, increasing the heat transfer area on the oil side. The upper side plate is made of sheet metal stamping, and the oil-side liquid collection chamber is integrally stamped and brazed to the core, reducing the number of argon arc welding welds in traditional structures and improving product reliability. The differential pressure bypass valve is integrated into the radiator core, reducing the complexity of system piping design. When the differential pressure between the oil inlet and outlet reaches a certain value, some oil bypasses the radiator core and flows directly from the inlet to the outlet, protecting the radiator core.

[0004] The technical solution of the present invention:

[0005] To achieve the above-mentioned objective, according to a first aspect of the present invention, an engine duct shaped radiator with bypass function is proposed, comprising an outer bypass casing 10 and a radiator 20; the outer bypass casing 10 is disposed within the engine duct, and the radiator 20 has a configuration with the same curvature as the outer bypass casing 10 and is embedded in the outer bypass casing 10.

[0006] In one possible embodiment, the radiator 20 includes an air-side cooling unit and a liquid-side cooling unit; the air-side cooling unit is disposed below the liquid-side cooling unit and is in contact with the cold airflow in the engine duct; the liquid-side cooling unit is used for heat dissipation through the flow of high-temperature lubricating oil.

[0007] In one possible embodiment, the liquid-side heat dissipation unit includes a partition 28, liquid-side fins 29, a top cover plate, a liquid-side base 23, a liquid-side nozzle 24, and nozzle screws 30. The top cover plate is disposed above the partition 28, and its circumferential edge is sealed to the partition 28. The liquid-side fins 29 are disposed in grooves on the upper surface of the partition 28. The top cover plate 22 has a raised U-shaped liquid-side collection channel 22, and two liquid-side bases are disposed symmetrically with respect to the collection channel 22. The liquid-side base 23 is fixedly connected to the liquid-side nozzle 24 by nozzle screw 30. One liquid-side nozzle 24 is a high-temperature lubricating oil inlet, and the other liquid-side nozzle 24 is a lubricating oil outlet cooled by the radiator. The air-side heat dissipation unit is fixedly connected to the lower surface of the partition 28. After the high-temperature lubricating oil flows in from the high-temperature lubricating oil inlet, it flows into the liquid-side fins 29 below for heat dissipation and cooling. At the same time, the air-side heat dissipation unit dissipates heat to the partition 28 through cold air. After cooling, it flows out from the lubricating oil outlet.

[0008] In one possible embodiment, the liquid-side fins 29 are rectangular serrated or straight fins, formed by stamping with a metal foil mold.

[0009] In one possible embodiment, the liquid-side heat dissipation unit further includes a bypass valve assembly. The bypass valve assembly is disposed on the liquid-side collection channel 22, located between the high-temperature lubricating oil inlet and the lubricating oil outlet. Under normal operating conditions, the bypass valve assembly is in the closed state. The high-temperature lubricating oil enters through the high-temperature lubricating oil inlet, dissipates heat through the radiator cavity, and then flows out through the lubricating oil outlet. When the pressure difference between the lubricating oil inlet and the lubricating oil outlet reaches a certain value, the bypass valve assembly opens, and a portion of the lubricating oil no longer enters the radiator cavity for heat dissipation, but flows out through the liquid-side collection channel 22 from the lubricating oil outlet.

[0010] In one possible embodiment, the bypass valve assembly includes a valve housing 25, a bypass valve 26, a plug sealing ring 32, a valve sealing ring 33, and a clamp 34; the valve housing 25 has an installation groove that mates with the bypass valve 26, and the valve housing 25 also has installation grooves that mate with the valve sealing ring 33 and the clamp 34; the valve sealing ring 33 is used to isolate and seal both sides of the bypass valve 26, and the clamp 34 is used to fix and limit the bypass valve 26.

[0011] In one possible embodiment, the air duct cooling unit includes air fins 21.

[0012] In one possible embodiment, the air fin 21 is a fin structure that can be formed by machining or profile extrusion.

[0013] According to a second invention of the present invention, an aircraft engine is proposed, comprising the above-described engine duct radiator with bypass function.

[0014] The beneficial effects of this invention are as follows: The irregularly shaped radiator device of this invention is installed on the engine's outer bypass duct, and the radiator core is integrally installed with the engine casing, integrating the functions of heat dissipation and the outer bypass casing. The radiator device serves both as part of the engine bypass duct and as a means of cooling the lubricating oil; the air-side fins are integrated with the radiator core, reducing thermal resistance and improving the thermal conductivity of the air-side fins and the core; the side plates of the radiator are made of sheet metal stamping, and the liquid collection chamber and differential pressure bypass valve flow channel are integrally stamped, reducing the number of parts and argon arc welding seams, and improving product reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a structural diagram of the heat sink in this invention;

[0017] Figure 3 This is a right view of the heat sink in this invention;

[0018] Figure 4 This is a cross-sectional view of the radiator AA in this invention;

[0019] Figure 5 This is a partially enlarged schematic diagram of the internal fins of the radiator in this invention;

[0020] Figure 6 This is a detailed diagram of the bypass valve in this invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, 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.

[0022] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0023] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, an engine duct radiator with bypass function includes an outer bypass casing 10 and a radiator 20. The outer bypass casing 10 is disposed inside the engine duct, and the radiator 20 has a configuration with the same curvature as the outer bypass casing 10 and is embedded in the outer bypass casing 10.

[0025] In the aforementioned engine duct radiator device with bypass function, the outer bypass casing 10 and the radiator are connected by fusion welding.

[0026] In one possible embodiment, the radiator 20 includes an air-side cooling unit and a liquid-side cooling unit; the air-side cooling unit is disposed below the liquid-side cooling unit and is in contact with the cold airflow in the engine duct; the liquid-side cooling unit is used for heat dissipation through the flow of high-temperature lubricating oil.

[0027] In one possible embodiment, such as Figure 2 , Figure 3 As shown, the liquid-side heat dissipation unit includes a partition plate 28, liquid-side fins 29, an upper cover plate, liquid-side bases 23, liquid-side nozzles 24, and nozzle screws 30. The upper cover plate covers the partition plate 28, and its circumferential edge is sealed to the partition plate 28. The liquid-side fins 29 are disposed in the grooves on the upper surface of the partition plate 28. The upper cover plate 22 has a raised U-shaped liquid-side collection channel 22. Two liquid-side bases 23 are symmetrically arranged relative to the collection channel 22. The liquid-side nozzles 24 are fixedly connected to the liquid-side bases by nozzle screws 30. One liquid-side nozzle 24 is a high-temperature lubricating oil inlet, and the other liquid-side nozzle 24 is a lubricating oil outlet cooled by the radiator. Figure 5As shown, the air-side heat dissipation unit is fixedly connected to the lower surface of the partition 28; after the high-temperature lubricating oil flows in from the high-temperature lubricating oil inlet, it flows into the liquid-side fins 29 below for heat dissipation and cooling. At the same time, the air-side heat dissipation unit dissipates heat to the partition 28 through cold air. After cooling, it flows out from the lubricating oil outlet.

[0028] The upper cover plate is an arc-shaped cover plate, which can be formed by machining or sheet metal forming.

[0029] The valve housing 25 and the liquid-side base 23 are respectively welded to the outer arc surface of the liquid-side collecting cavity 22, effectively increasing the structural strength of the liquid-side base 23. The positions of the valve housing 25 and the liquid-side base 23 can be changed according to specific requirements, such as... Figure 1 and Figure 2 As shown.

[0030] The mounting surface of the liquid-side base 23 is provided with a screw connection flange. The liquid-side nozzle 24 is connected to the liquid-side base 23 by nozzle screws 30. The liquid-side nozzle is designed as a detachable structure, which increases the maintainability of the product. In some embodiments, there may be multiple nozzle screws 30.

[0031] In the aforementioned radiator, the air fins 21, liquid-side fins 29, liquid-side collecting chamber 22, and baffle 28 are formed and fixedly connected by brazing. During brazing, the air fins 21 are placed at the bottom, and from bottom to top, they are the liquid-side fins 29, baffle 28, and liquid-side collecting chamber 22. Figure 4 and Figure 5 As shown.

[0032] In one possible embodiment, the liquid-side fins 29 are rectangular serrated or straight fins, formed by stamping with a metal foil mold.

[0033] The liquid-side fins 29 are placed between the air fins 21 and the partition 28, and are brazed to form the radiator core, as shown below. Figure 3 As shown. In some embodiments, for ease of fin welding and installation, there may be two or more liquid-side fins.

[0034] In one possible embodiment, the liquid-side heat dissipation unit further includes a bypass valve assembly. The bypass valve assembly is disposed on the liquid-side collection channel 22, located between the high-temperature lubricating oil inlet and the lubricating oil outlet. Under normal operating conditions, the bypass valve assembly is in the closed state. The high-temperature lubricating oil enters through the high-temperature lubricating oil inlet, dissipates heat through the radiator cavity, and then flows out through the lubricating oil outlet. When the pressure difference between the lubricating oil inlet and the lubricating oil outlet reaches a certain value, the bypass valve assembly opens, and a portion of the lubricating oil no longer enters the radiator cavity for heat dissipation, but flows out through the liquid-side collection channel 22 from the lubricating oil outlet.

[0035] In one possible embodiment, such as Figure 4As shown, the bypass valve assembly includes a valve housing 25, a bypass valve 26, a plug sealing ring 32, a valve sealing ring 33, and a clamp 34. The valve housing 25 has an installation groove that mates with the bypass valve 26, and the valve housing 25 also has installation grooves that mate with the valve sealing ring 33 and the clamp 34. The valve sealing ring 33 is used to isolate and seal both sides of the bypass valve 26, and the clamp 34 is used to fix and limit the bypass valve 26.

[0036] In this embodiment, the valve housing 25 and the plug 27 are connected by assembly and sealed with a valve sealing ring 33 and fixed with plug screws 31.

[0037] In some embodiments, the valve housing 25 and the plug 27 may be connected by threads.

[0038] In one possible embodiment, the air duct cooling unit includes air fins 21.

[0039] In one possible embodiment, the air fin 21 is a fin structure that can be formed by machining or profile extrusion.

[0040] In this embodiment, as Figure 6 As shown, the spring seat 101 of the bypass valve 26 is fixedly connected to the housing 102 by threads. The opening pressure of the bypass valve is specifically controlled by adjusting the number of springs 113 and adjusting shims 115. The valve plate 114 is assembled in the guide hole provided on the valve seat. The opening and closing direction of the valve is controlled by the compression and return of the spring.

[0041] According to the product structure of an engine bypass radiator with bypass function, the manufacturing process of the device includes, but is not limited to:

[0042] 1) Air fin and liquid side fin forming, basic part forming → 2) Radiator core brazing → 3) Weld valve housing → 4) Weld liquid side base → 5) Weld radiator and outer casing around → 6) Machining assembly casing shape → 7) Install and assemble bypass valve, valve seal ring, clamp, valve plug and plug screw → 8) Install and assemble liquid side nozzle and nozzle screw.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ducted radiator with bypass function for engines, characterized in that, Includes an outer bypass casing (10) and a radiator (20); the outer bypass casing (10) is disposed inside the engine duct, and the radiator (20) has a configuration with the same curvature as the outer bypass casing (10) and is embedded in the outer bypass casing (10); The radiator (20) includes an air-side cooling unit and a liquid-side cooling unit; the air-side cooling unit is disposed below the liquid-side cooling unit and is in contact with the cold air flow in the engine duct; the liquid-side cooling unit is used for heat dissipation by the flow of high-temperature lubricating oil. The liquid-side heat dissipation unit includes a partition (28), liquid-side fins (29), an upper cover plate, a liquid-side base (23), a liquid-side nozzle (24), and nozzle screws (30); the upper cover plate is placed on top of the partition (28), and its circumferential edge is sealed to the partition (28); the liquid-side fins (29) are disposed in the groove on the upper surface of the partition (28); the upper cover plate has a raised U-shaped liquid-side collection channel (22); and two liquid-side bases are disposed symmetrically with respect to the liquid-side collection channel (22). 23) The liquid-side nozzle (24) is fixedly connected to the liquid-side base by nozzle screw (30). One of the liquid-side nozzles (24) is a high-temperature lubricating oil inlet, and the other liquid-side nozzle (24) is a lubricating oil outlet cooled by the radiator. The air-side heat dissipation unit is fixedly connected to the lower surface of the partition plate (28). After the high-temperature lubricating oil flows in from the high-temperature lubricating oil inlet, it flows into the liquid-side fins (29) below for heat dissipation and cooling. At the same time, the air-side heat dissipation unit dissipates heat to the partition plate (28) through cold air. After cooling, it flows out from the lubricating oil outlet.

2. The engine duct radiator with bypass function according to claim 1, characterized in that, The liquid-side fins (29) are rectangular serrated or straight fins, formed by stamping with a metal foil mold.

3. The engine duct radiator with bypass function according to claim 1, characterized in that, The liquid-side heat dissipation unit also includes a bypass valve assembly. The bypass valve assembly is located on the liquid-side collection channel (22) between the high-temperature lubricating oil inlet and the lubricating oil outlet. Under normal working conditions, the bypass valve assembly is in the closed state. The high-temperature lubricating oil enters through the high-temperature lubricating oil inlet, dissipates heat through the radiator cavity, and then flows out through the lubricating oil outlet. When the pressure difference between the lubricating oil inlet and the lubricating oil outlet reaches a certain value, the bypass valve assembly opens, and a portion of the lubricating oil no longer enters the radiator cavity for heat dissipation. Instead, it flows out through the liquid-side collection channel (22) from the lubricating oil outlet.

4. A bypass duct radiator with a bypass function according to claim 3, characterized in that, The bypass valve assembly includes a valve housing (25), a bypass valve (26), a plug sealing ring (32), a valve sealing ring (33), and a clamp (34). The valve housing (25) has an installation groove that mates with the bypass valve (26), and the valve housing (25) also has installation grooves that mate with the valve sealing ring (33) and the clamp (34). The valve sealing ring (33) is used to isolate and seal both sides of the bypass valve (26), and the clamp (34) is used to fix and limit the bypass valve (26).

5. A bypass duct radiator with a bypass function according to claim 1, characterized in that, The air-side heat dissipation unit includes air fins (21).

6. A bypass duct radiator with a bypass function according to claim 5, characterized in that, The air fins (21) are fin structures and can be formed by machining or profile extrusion.

7. An aircraft engine, characterized in that, The invention comprises an engine duct radiator with bypass function as described in any one of claims 1-6.

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