A wide-condition high-power-to-weight ratio heat dissipation device

Abstract

The utility model discloses a wide working condition high power weight ratio heat abstractor. Including air hydraulic oil radiator (1), air hydraulic oil radiator (1) cold side export and air slide oil radiator (2) cold side import connection, air slide oil radiator (2) cold side export passes through the air passage (3) with volute (4) import connection, volute (4) export and air outlet (5) are connected, and volute (4) still is equipped with cooling fan (6) in. The utility model discloses reduced product weight, satisfies the demand of the heat dissipation of the hydraulic oil radiator of helicopter main speed reducer slide oil under two rotating speed conditions, and has promoted the power weight ratio.

Description

Technical Field

[0001] This utility model relates to the field of helicopter integrated thermal management technology, and in particular to a heat dissipation device with high power-to-weight ratio under wide operating conditions. Background Technology

[0002] Helicopters are evolving towards higher speeds and lighter weights to achieve superior performance during flight. However, increased flight speeds often come with increased cooling demands. Traditionally, this requires several additional cooling systems to dissipate lubricating and hydraulic fluid from different parts. This increases the number, size, and weight of cooling systems, reducing the helicopter's power-to-weight ratio, limiting further speed increases, and significantly diminishing overall performance. For a current helicopter cooling system structure, see [link to relevant documentation]. Figure 6 It mainly consists of an air-oil radiator (a), a mixed-flow fan (b), a transition duct (c), a pressure strip (d), screws (e), and clamps (f). The air-oil radiator (a) is connected to the mixed-flow fan (b) via the transition duct (c). One end of the transition duct (c) is connected to the air-oil radiator (a) via screws (e) passing through the pressure strip (d), and the other end is connected to the mixed-flow fan (b) via clamps (f). This cooling device can only cool the lubricating oil of the helicopter's main gearbox and cannot meet the needs of hydraulic cooling. Therefore, a separate device for cooling hydraulic oil is required, increasing the overall weight of the aircraft and hindering the improvement of flight speed. Furthermore, it only has one operating speed and lacks adaptability to wide operating conditions. Utility Model Content

[0003] The purpose of this invention is to provide a heat dissipation device with a high power-to-weight ratio under wide operating conditions. This invention reduces the product weight, meets the requirements for simultaneously cooling the lubricating oil and hydraulic oil of the helicopter main gearbox under two speed conditions, and improves the power-to-weight ratio.

[0004] The technical solution of this utility model is: a wide operating condition high power-to-weight ratio heat dissipation device, including an air-hydraulic oil radiator, the cold side outlet of the air-hydraulic oil radiator is connected to the cold side inlet of the air-hydraulic oil radiator, the cold side outlet of the air-hydraulic oil radiator is connected to the inlet of the volute through a transition air duct, the outlet of the volute is connected to the exhaust air duct, and a cooling fan is also provided inside the volute.

[0005] In the aforementioned wide-condition high power-to-weight ratio heat dissipation device, the air-hydraulic oil radiator and the air-lubricating oil radiator are connected by screws to form a modular heat dissipation module.

[0006] In the aforementioned wide-condition high power-to-weight ratio heat dissipation device, both the air-hydraulic oil radiator and the air-lubricating oil radiator have temperature- and pressure-sensitive bypass valves in their hot-side channels.

[0007] In the aforementioned wide-condition high power-to-weight ratio heat dissipation device, the side wall of the exhaust duct facing the wind forms an angle of 105° to 135° with the outlet wall of the volute connected to it.

[0008] In the aforementioned wide-condition high power-to-weight ratio heat dissipation device, the ratio of the tip chord length to the root chord length of the cooling fan impeller blades varies from 1 to 1.15.

[0009] In the aforementioned wide operating condition high power-to-weight ratio heat dissipation device, the leading edge of the cooling fan impeller blades is generally a forward-convex arc, which transitions to the outer edge of the impeller blades via a transition arc.

[0010] The advantages of this utility model are: This utility model modularly combines the air lubricating oil radiator and the air hydraulic oil radiator, adds a rounded transition at the leading edge of the impeller blades, widens the stable working range of the impeller, and effectively meets the requirements of a wide range of working conditions. This utility model's air-oil radiator and air-hydraulic oil radiator adopt a series structure, so that cold air first passes through the air-hydraulic oil radiator with a small heat dissipation capacity and then through the air-oil radiator with a large heat dissipation capacity; this not only maximizes the utilization of air heat dissipation but also reduces the cross-sectional size of the radiator. The air lubricating oil radiator and the air hydraulic oil radiator of this utility model are connected by bolts, and the radiator can be replaced separately when it fails, which improves the maintainability of the equipment. This utility model is equipped with temperature- and pressure-sensitive bypass valves on the air lubricating oil radiator and the air hydraulic oil radiator, so that the lubricating oil or hydraulic oil can bypass under low temperature or high pressure, thus protecting the equipment. This utility model has an exhaust duct at the outlet of the cooling fan. The left side of the exhaust duct forms an angle of 105° to 135° with the outlet wall of the cooling fan volute. This can reduce the rapid turning of the airflow when it is discharged from the volute, reduce impact loss and play a certain role in diffusion. The ratio of the tip chord length to the root chord length of the impeller blades in this invention is 1 to 1.15, which ensures that the airflow is trapped in the blade channel, making it less prone to eddies, reducing impeller resistance damage, and improving impeller efficiency. The impeller blades of this invention feature a "forward convex" design at the leading edge, which allows the blades to gradually cut the airflow and reduce the impact of the airflow on the impeller. This invention ensures that the airflow does not fluctuate drastically when the helicopter's main deceleration speed drops from 100% to 85%, and that the cooling fan remains within a stable operating range; the power-to-weight ratio is 4.26 at 100% speed and 3.7 at 85% speed, achieving the requirement of a high power-to-weight ratio under wide operating conditions. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram showing the connection between the air hydraulic oil cooler and the air lubricating oil cooler; Figure 3 This is a schematic diagram of the angle between the exhaust duct and the volute. Figure 4 This is a schematic diagram of the impeller chord length variation; Figure 5 This is a schematic diagram of the impeller leading edge; Figure 6 This is a schematic diagram of a traditional helicopter cooling system. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0013] Example 1. A heat dissipation device with high power-to-weight ratio under wide operating conditions, see [link to example]. Figures 1-5 It includes an air hydraulic oil radiator 1, the cold side outlet of the air hydraulic oil radiator 1 is connected to the cold side inlet of the air lubricating oil radiator 2, the cold side outlet of the air lubricating oil radiator 2 is connected to the inlet of the volute 4 via the transition air duct 3, the outlet of the volute 4 is connected to the exhaust air duct 5, and a cooling fan 6 is also provided inside the volute 4.

[0014] The aforementioned air hydraulic oil radiator 1 and air lubricating oil radiator 2 are connected by screws 7 to form a modular heat dissipation module.

[0015] The aforementioned air-hydraulic oil radiator 1 and air-lubricating oil radiator 2 are both equipped with temperature- and pressure-sensitive bypass valves 8 in their hot side channels.

[0016] The aforementioned exhaust duct 5 has an angle of 105° to 135° with the outlet wall of the volute 4 it is connected to.

[0017] The ratio of the tip chord length 61 to the root chord length 62 of the aforementioned cooling fan 6 impeller blades varies from 1 to 1.15.

[0018] The leading edge of the impeller blades of the aforementioned cooling fan 6 is generally a forward-convex arc 63, which transitions to the outer edge of the impeller blades via a transition arc 64.

[0019] Air is first drawn into the air-hydraulic oil radiator 1 by the cooling fan 6, then passes through the air-lubricating oil radiator 2, enters the cooling fan 6 through the transition air duct 3, and is discharged through the exhaust duct 5 under the action of the impeller.

[0020] By connecting the air hydraulic oil cooler 1 and the air lubricating oil cooler 2 together with screws, a modular design is achieved, which can improve the utilization rate of air and facilitate product maintenance. By installing temperature- and pressure-sensitive bypass valves 8 on the air lubricating oil radiator and the air hydraulic oil radiator respectively, the lubricating oil or hydraulic oil can be bypassed at low temperature or high pressure, thus protecting the equipment. By designing the left side of the exhaust duct to form an angle of 105° to 135° with the outlet wall of the cooling fan volute, the rapid turning of the airflow when it exits the volute can be reduced, the impact loss can be reduced, and a certain diffusion effect can be achieved. By designing the impeller blades so that the ratio of tip chord length to root chord length varies from 1 to 1.15, the airflow is ensured to be trapped in the blade channel, making it less prone to vortices, reducing impeller drag damage, and improving impeller efficiency. By adopting a "forward-convex" design at the leading edge of the impeller blades, the blades gradually cut the airflow, reducing the impact of the airflow on the impeller.

Claims

1. A heat dissipation device with high power-to-weight ratio under wide operating conditions, characterized in that, It includes an air hydraulic oil radiator (1), the cold side outlet of the air hydraulic oil radiator (1) is connected to the cold side inlet of the air lubricating oil radiator (2), the cold side outlet of the air lubricating oil radiator (2) is connected to the inlet of the volute (4) via the transition air duct (3), the outlet of the volute (4) is connected to the exhaust duct (5), and a cooling fan (6) is also provided inside the volute (4).

2. The wide-condition, high power-to-weight ratio heat dissipation device according to claim 1, characterized in that, The air hydraulic oil radiator (1) and the air lubricating oil radiator (2) are connected by screws (7) to form a modular heat dissipation module.

3. The wide-condition, high power-to-weight ratio heat dissipation device according to claim 1, characterized in that, Both the air hydraulic oil radiator (1) and the air lubricating oil radiator (2) are equipped with temperature and pressure sensing bypass valves (8) in their hot side channels.

4. The wide-condition, high power-to-weight ratio heat dissipation device according to claim 1, characterized in that, The exhaust duct (5) has an angle of 105° to 135° with the volute (4) outlet wall that is connected to its windward side wall.

5. The wide-condition, high power-to-weight ratio heat dissipation device according to claim 1, characterized in that, The ratio of the tip chord length (61) to the root chord length (62) of the impeller blades of the cooling fan (6) varies from 1 to 1.

15.

6. The wide-condition, high power-to-weight ratio heat dissipation device according to claim 1, characterized in that, The leading edge of the impeller blades of the cooling fan (6) is a forward convex arc (63), which transitions to the outer edge of the impeller blades via a transition arc (64).

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