Controllable heat dissipation valve mechanism for engine nacelle of low-speed unmanned aerial vehicle

Abstract

The invention discloses a low-speed unmanned aerial vehicle engine nacelle controllable heat dissipation valve mechanism in the technical field of aircraft structure design, which comprises a front valve and a rear valve, the front valve is provided with a front door connecting seat, one end of the front door connecting seat is hinged with a front door connecting plate, and the other end of the front door connecting seat is hinged with a front door pull rod; a front door rocker arm is hinged to the front door pull rod, a rear door connecting seat is fixedly connected to the rear valve, a rear door connecting plate is fixedly connected to the rear valve, and a rear door pull rod is hinged to the rear door connecting seat. The radiator air inlet and the intercooler air outlet of the engine nacelle are designed into the controllable hinge valves, and the air volume of the cold air duct and the radiator air duct in the engine nacelle can be effectively controlled through the combination of the rotary steering engine and the connecting rod mechanism, so that the overheating and supercooling phenomena of the engine are reduced; meanwhile, the working efficiency of the engine is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft structural design, and particularly relates to a valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle. Background Art

[0002] After a twin-engine fixed-wing UAV has flown at low altitude for a long time, its engine will generate a large amount of heat. At this time, if the heat dissipation system in the nacelle cannot dissipate heat from the engine in time, the engine will overheat. Over a long time, problems such as damage to the pistons and cylinders in the engine and gear adhesion will occur, directly damaging the engine. At the same time, when the aircraft is flying at high altitude, due to the too low temperature at high altitude, the mixture (or air) at sub-zero temperature enters the cylinder, and the engine will also experience overcooling, resulting in an intercooler failure, causing the engine power to decrease and the fuel consumption to increase. In severe cases, the engine will even directly flame out, causing irreversible losses; In addition, under this environment, the water vapor and acidic gases generated by the engine combustion are also extremely easy to condense into acidic liquids, which are more likely to corrode the airframe and reduce the service life of the aircraft. Therefore, the problems of engine overheating and overcooling occurring during flight will directly affect the overall flight state and service life of the aircraft. Therefore, we propose a valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle. Summary of the Invention

[0003] Aiming at the deficiencies in the prior art, the present invention provides a valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle. By designing the air inlet of the engine nacelle radiator and the air outlet of the intercooler as controllable hinge valves, the combination of a rotary servo and a link mechanism can effectively control the air volume in the cold air duct and the radiator duct of the engine nacelle, reduce the occurrence of engine overheating and overcooling phenomena, and improve the working efficiency of the engine at the same time.

[0004] The purpose of the present invention is achieved as follows: A valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle, including a front valve and a rear valve. A front door connection seat is provided on the front valve. One end of the front door connection seat is hinged to a front door connecting plate, and the other end of the front door connection seat is hinged to a front door pull rod. A front door rocker arm is hinged on the front door pull rod. A rear door connection seat is fixedly connected to the rear valve. A rear door connecting plate is fixedly connected to the rear valve. A rear door pull rod is hinged on the rear door connection seat, and a rear door rocker arm is hinged on the rear door pull rod.

[0005] Optionally, connection heads are threadedly connected to both ends of the front door pull rod, and double nuts are provided at the connection parts of the connection heads and the front door pull rod.

[0006] Optionally, the front door rocker arm is tapered, the two ends of the front door rocker arm are rounded, a weight-reducing hole is provided on the front door rocker arm, reinforcing ribs are provided on the front door rocker arm, and the front door rocker arm is hinged to the connector.

[0007] Optionally, the front door connecting seat includes a first support plate, a front door mounting groove is provided on the first support plate, the front door mounting groove is fixedly connected to the front flap, a first connecting portion is provided on the first support plate, and the first connecting portion is hinged to the connector.

[0008] Optionally, a front door support seat is provided on the front flap, the front door support seat is correspondingly arranged with the front door connecting seat, and the front door support seat and the front door connecting seat are symmetrically distributed.

[0009] Optionally, a front door skin is provided on the front flap, and bending portions are provided on both sides of the front door skin.

[0010] Optionally, a first connecting plate is fixedly connected to the front door connecting plate, a first connecting plate is provided on the front door connecting plate, the number of the first connecting plates is two, the two first connecting plates are symmetrically distributed, and the two first connecting plates are respectively hinged to the front door connecting seat and the front door support seat.

[0011] Optionally, the rear door connecting seat includes a second support plate, a rear door mounting groove is provided on the second support plate, the rear door mounting groove is fixedly connected to the rear flap, a second connecting portion is provided on the second support plate, and the second connecting portion is hinged to the rear door pull rod.

[0012] Optionally, rear door support seats are provided on both sides of the rear flap, the rear door support seats are correspondingly arranged with the rear door connecting seat, a hinge connecting member is bolted to the rear door support seat, and the hinge connecting member is hinged to the rear door connecting plate.

[0013] Optionally, a rear door skin is provided on the rear flap, and the rear door skin is fixedly connected to the rear door connecting seat and the rear door support seat respectively.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By providing the front flap and rear flap structures, when the UAV flies at low altitude for a long time and the engine generates a large amount of heat, the operator can issue an instruction through the computer to control the rotary servo to drive the short nacelle front door rocker arm and the rear door rocker arm to rotate, drive the pull rod to make the front flap of the engine short nacelle rotate downward and the rear flap of the engine short nacelle rotate upward. At this time, the cross-sectional areas of the air inlet of the radiator air duct and the air outlet of the intercooler air duct both increase, improving the working efficiency of the intercooler and the radiator in dissipating heat from the engine and reducing the risk of engine damage; Secondly, when the drone climbs to a high altitude and encounters low-temperature mixed gas (or air), it is extremely prone to malfunction due to the intolerance of the intercooler to cold. At this time, the operator can control the rotary servo of the rear valve to rotate in the opposite direction, driving the linkage mechanism to turn the rear valve of the engine nacelle downward, reducing the cross-sectional area of the outlet of the intermediate cold air duct, thereby reducing the possibility of the engine experiencing supercooling problems. Brief Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0016] Figure 1 It is a schematic diagram of the closed state of the front valve structure of the engine nacelle radiator air duct provided by the present invention.

[0017] Figure 2 It is a schematic diagram of the open state of the front valve structure of the engine nacelle radiator air duct provided by the present invention.

[0018] Figure 3 It is a schematic diagram of the overall structure of the front valve provided by the present invention.

[0019] Figure 4 It is an exploded view of the front valve structure provided by the present invention.

[0020] Figure 5 It is a schematic diagram of the structure of the front door connecting seat provided by the present invention.

[0021] Figure 6 It is a schematic diagram of the initial state of the rear valve at the outlet of the intermediate cold air duct of the engine nacelle provided by the present invention.

[0022] Figure 7 It is a schematic diagram of the open state of the rear valve provided by the present invention.

[0023] Figure 8 It is a schematic diagram of the first perspective of the rear valve provided by the present invention.

[0024] Figure 9 It is an exploded view of the rear valve structure provided by the present invention.

[0025] Figure 10 It is a schematic diagram of the second perspective of the rear valve provided by the present invention.

[0026] Figure 11 It is a schematic diagram of the structure of the rear door connecting seat provided by the present invention.

[0027] In the figure: 1. Front door rocker arm; 101. Weight reduction hole; 102. Reinforcing rib; 2. Front door connecting plate; 201. First connecting plate; 3. Front valve; 301. Front door skin; 302. Bending part; 4. Front door pull rod; 401. Connector; 5. Front door connecting seat; 501. First support plate; 502. Front door installation groove; 503. First connecting part; 6. Front door support seat; 7. Rear door connecting plate; 8. Rear door support seat; 801. Hinge connecting piece; 9. Rear door connecting seat; 901. Second support plate; 902. Rear door installation groove; 903. Second connecting part; 10. Rear valve; 1001. Rear door skin; 11. Rear door rocker arm; 12. Rear door pull rod. Detailed implementation manner

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] As Figures 1 to 11 A valve mechanism for controllable heat dissipation of a short nacelle of a low-speed UAV engine shown in the figure includes a front valve 3 and a rear valve 10. A front door connecting seat 5 is provided on the front valve 3. One end of the front door connecting seat 5 is hinged to a front door connecting plate 2, and the other end of the front door connecting seat 5 is hinged to a front door pull rod 4. A front door rocker arm 1 is hinged to the front door pull rod 4.

[0030] Specifically, a first connecting plate 201 is fixedly connected to the front door connecting plate 2. There is a first connecting plate 201 on the front door connecting plate 2. The number of the first connecting plates 201 is two. The two first connecting plates 201 are symmetrically distributed. The two first connecting plates 201 are respectively hinged to the front door connecting seat 5 and the front door support seat 6.

[0031] It should be noted that both the front valve 3 and the rear valve 10 are manufactured by using the carbon fiber honeycomb sandwich method, so that the front valve 3 and the rear valve 10 have the characteristics of light weight, high strength and small deformation, and have sufficient strength to bear the load when the front valve 3 and the rear valve 10 are opened; Furthermore, the front door connecting plate 2 is assembled onto the skeleton connected to the front flap 3 of the engine nacelle by riveting. Then, the front door connection seat 5 and the front door support seat 6 are fixed to the surface of the front flap 3 by a combination of adhesive and riveting. It should be noted that the honeycomb core area of the front flap 3 cannot be riveted and needs to be fixed by adhesive bonding. Then, the front door connection seat 5 and the front door support seat 6 are respectively hinged to the front door connecting plate 2. Next, the front door rocker arm 1 is fixedly connected to the rotary actuator inside the nacelle. One end of the front door pull rod 4 is connected to the front door rocker arm 1 through a fastening standard part, and the other end of the front door pull rod 4 is connected to the front door connection seat 5, thus forming a complete structure of the front flap 3 of the air inlet of the engine nacelle radiator duct; Furthermore, the computer issues an instruction to control the front door rocker arm 1 to rotate counterclockwise. The front door pull rod 4 is used to push the front flap 3 of the engine nacelle to rotate downward, that is, the front flap 3 of the engine nacelle gradually opens until the flap rotates to the maximum angle. At this time, the cross-sectional area of the air inlet of the radiator duct is the largest, greatly improving the working efficiency of the radiator for cooling the engine and effectively reducing the occurrence of engine overheating.

[0032] Specifically, connection heads 401 are threadedly connected to both ends of the front door pull rod 4, and double nuts are provided at the connection part between the connection heads 401 and the front door pull rod 4.

[0033] Furthermore, both ends of the front door pull rod 4 are fastened by threaded connection. Assembly or disassembly can be completed without complex tools, which is convenient for daily maintenance and replacement. At the same time, the thread pair has a self-locking characteristic and can maintain stability in a vibration environment, avoiding loosening; In addition, threaded connection allows fine adjustment of the pull rod length, which can compensate for manufacturing tolerances or installation errors, ensuring precise fit with the front door mechanism. At the same time, threaded connection can withstand a large axial tension and is suitable for transmitting the reciprocating load when the front flap 3 is switched; Furthermore, the use of a double-nut locking structure can further improve the anti-loosening performance of the connection. After the main nut applies the initial pre-tightening force, the sub-nut generates an additional locking torque by reverse tightening, forming a double anti-loosening mechanism. This design can effectively resist high-frequency vibration and avoid the risk of thread slipping or loosening of a single nut due to alternating loads; Secondly, the mutual restriction between the double nuts can also disperse the thread stress and reduce the stress concentration phenomenon. Even if one nut loosens slightly, the other nut can still maintain the basic fastening force, significantly improving the safety redundancy.

[0034] Specifically, the front door rocker arm 1 is tapered, the two ends of the front door rocker arm 1 are rounded, a weight-reducing hole 101 is provided on the front door rocker arm 1, a reinforcing rib 102 is provided on the front door rocker arm 1, and the front door rocker arm 1 is hinged to the connection head 401.

[0035] Furthermore, the front door rocker arm 1 is designed in a conical shape to optimize the force distribution, enabling the front door rocker arm 1 to achieve a gradual stress transfer when bearing the front door opening and closing loads, avoiding local stress concentration, and improving the structural strength and fatigue resistance. The two ends are rounded to eliminate sharp edges and corners, reduce stress concentration, and at the same time reduce the interference risk during assembly, enhancing safety. The setting of the weight reduction holes 101 can effectively reduce the overall weight on the premise of ensuring sufficient stiffness, reduce the moment of inertia, and make the front door operate more lightly and flexibly. The reinforcing ribs 102 are used to further enhance the bending and torsional resistance of the rocker arm, prevent deformation, and ensure the reliability of long-term use.

[0036] Specifically, the front door connecting seat 5 includes a first support plate 501. A front door installation groove 502 is formed on the first support plate 501. The front door installation groove 502 is fixedly connected to the front flap 3. A first connecting portion 503 is provided on the first support plate 501, and the first connecting portion 503 is hinged to the connecting head 401.

[0037] Furthermore, the front door installation groove 502 is a gradually narrowing groove-shaped structure formed by the depression of the first support plate 501 for fitting the front flap 3. At the same time, two rib plates are provided below the first support plate 501 to strengthen the strength of the first support plate 501. One end of the first support plate 501 is provided with a hinged structure for connecting the front door connecting plate 2, and the other end has a protruding hinged structure for connecting the front door pull rod 4.

[0038] Specifically, a front door support seat 6 is provided on the front flap 3. The front door support seat 6 is arranged corresponding to the front door connecting seat 5, and the front door support seat 6 and the front door connecting seat 5 are symmetrically distributed.

[0039] Furthermore, the structure of the front door support seat 6 is similar to that of the front door connecting seat 5, and they are respectively fixed on both sides of the front flap 3, which can make the front flap 3 more balanced in force during the opening and closing process, avoid structural deformation or wear caused by excessive unilateral force. At the same time, it can effectively disperse the dynamic load during the movement of the door body, improving the stability and durability of the overall structure.

[0040] In addition, the symmetrical arrangement helps to keep the movement track of the front flap 3 stable, reduce eccentric load and vibration, thereby reducing the operating noise and improving the operation smoothness. It can also enhance the rigidity of the front door system, enabling it to maintain reliable performance even during frequent opening and closing or under external impact, and extending the service life.

[0041] Specifically, a front door skin 301 is provided on the front flap 3, and bending portions 302 are provided on both sides of the front door skin 301.

[0042] Furthermore, the bending parts 302 are arranged on both sides of the front door skin 301, which can significantly enhance the structural stiffness and anti-deformation ability of the skin, enabling it to remain stable when withstanding wind pressure, vibration or external impact, avoiding dents or deformations. The bending design can also optimize the edge strength of the skin, reduce the risk of fatigue cracking caused by stress concentration, and extend the service life. In addition, the bending parts 302 can form a natural flow guiding structure, reducing air resistance during high-speed operation, while reducing wind noise and enhancing ride comfort. The bending parts 302 can also serve as an installation and positioning reference, facilitating precise assembly with other components such as butt joint skins or front door frames, ensuring sealing performance and fitting accuracy.

[0043] When the cross-sectional area of the radiator air duct inlet is the largest, the gap between the flanges of the bending parts 302 on both sides of the front door skin 301 of the engine nacelle and the butt joint skin is close to zero, thereby ensuring that the incoming air flow only enters through the air inlet and does not enter from other larger gaps to affect the normal flight of the aircraft.

[0044] Specifically, a rear door connection seat 9 is fixedly connected to the rear door 10, a rear door connection plate 7 is fixedly connected to the rear door 10, a rear door pull rod 12 is hinged to the rear door connection seat 9, and a rear door rocker arm 11 is hinged to the rear door pull rod 12. Furthermore, the rear door connection plate 7 is assembled on the skin connected to the rear door 10 of the engine nacelle by riveting, that is, one end of the fixed hinge is fixed. Then, the two rear door support seats 8 and the rear door connection seat 9 are fixed on the surface of the rear door 10 of the engine nacelle by a combination of glue and riveting. Then, the combined two ends of the hinge are connected through fastening standard parts and hinge connectors 801 to form a complete hinge structure. Finally, the rear door rocker arm 11 is fixed to the positioned rotary actuator, and the rear door pull rod 12 and the hinge structures on the rear door rocker arm 11 and the rear door connection seat 9 are respectively connected through fastening standard parts to form a complete structure of the front door 3 of the radiator air duct inlet of the engine nacelle. Similarly, the honeycomb core area cannot be riveted and needs to be bonded. Furthermore, the computer issues an instruction to control the rear door rocker arm 11 to rotate clockwise, pushing the rear door 10 of the engine nacelle to rotate downward through the rear door pull rod 12, that is, the rear door 10 of the engine nacelle gradually closes until the rear door 10 rotates to the maximum angle. At this time, the cross-sectional area of the middle cold air duct inlet is the smallest, reducing the air output of the middle cold air duct, so that when the aircraft flies in an environment with too low temperature at high altitude, the possibility of the engine having an overcooling problem is reduced. Controlling the rear door rocker arm 11 of the nacelle to rotate counterclockwise will increase the cross-sectional area of the middle cold air duct inlet, improve the working efficiency of the middle cold, and reduce the occurrence of engine overheating. When the cross-sectional area of the inlet of the middle cold air duct is the largest, the gaps between the flanges on both sides of the rear door skin 1001 and the butt joint skin are close to zero, thus ensuring that the air flows out only through the air outlet and does not flow out from other large gaps to affect the normal flight of the aircraft. At the same time, the flanges on both sides can also increase the stiffness of the valve.

[0045] Specifically, the rear door connection seat 9 includes a second support plate 901. A rear door installation groove 902 is formed on the second support plate 901. The rear door installation groove 902 is fixedly connected to the rear valve 10. A second connection portion 903 is provided on the second support plate 901. The second connection portion 903 is hinged to the rear door pull rod 12.

[0046] Furthermore, the second support plate 901 of the rear door connection seat 9 is used to provide a stable installation reference. The rear door installation groove 902 thereon ensures the precise positioning and reliable fixation of the rear valve 10, avoiding movement interference caused by assembly errors. The hinged structure of the second connection portion 903 and the rear door pull rod 12 is used to achieve effective force transmission, making the valve opening and closing actions smoother. This modular design is not only convenient for assembly but also for later maintenance and replacement; At the same time, the rigid structure of the second support plate 901 can withstand the reciprocating load transmitted by the rear door pull rod 12, reduce stress concentration, and improve the overall durability. The optimized layout of the installation groove and the second connection portion 903 makes the structure compact, realizes efficient force transmission in a limited space, and ensures the stable operation of the adjustment system of the rear valve 10 of the engine nacelle.

[0047] Specifically, rear door support seats 8 are arranged on both sides of the rear valve 10. The rear door support seats 8 are arranged corresponding to the rear door connection seat 9. A hinge connecting member 801 is bolted to the rear door support seat 8. The hinge connecting member 801 is hinged to the rear door connecting plate 7.

[0048] Furthermore, the symmetrical arrangement of the rear door support seats 8 and the rear door connection seat 9, combined with the bolt fixing method of the hinge connecting member 801, can effectively disperse the dynamic load during the movement of the valve, improving the structural stability and anti-fatigue performance.

[0049] Specifically, a rear door skin 1001 is provided on the rear valve 10. The rear door skin 1001 is fixedly connected to the rear door connection seat 9 and the rear door support seat 8 respectively.

[0050] Furthermore, the rear door skin 1001 is fixedly connected to the rear door connection seat 9 and the rear door support seat 8 to form a stable support structure, enhancing the overall stiffness and anti-deformation ability of the rear valve 10, being able to evenly transmit the dynamic load during the movement of the valve, avoiding local stress concentration, and improving the structural durability; Meanwhile, the tight fit between the rear door skin 1001 and the support components ensures the flatness of the aerodynamic profile, reduces vibration and noise under high-speed airflow, and the sealing treatment at the fixed connection can also prevent air leakage, ensuring effective control of the airflow inside the engine nacelle.

[0051] In summary, by controllably setting the air intake and outlet volumes of the engine nacelle, that is, setting the valve mechanism with controllable heat dissipation, the impacts on the aircraft caused by overheating and overcooling of the engine are reduced. When the engine temperature is too high, the control servo drives the front and rear valves 10 to increase the air intake and outlet areas, enabling the intercooler and radiator to cool the engine efficiently; conversely, when the air temperature is too low at high altitudes, the control servo drives the rear valve 10 to close and reduce the outlet area, reducing the impact of cold air on the intercooler and lowering the possibility of the engine experiencing overcooling problems. Therefore, the design of the valve mechanism with controllable heat dissipation for the engine nacelle of a certain low-speed unmanned aircraft has great advantages. Compared with traditional engine nacelles without valves, it can not only reduce the occurrence of engine overheating and overcooling phenomena, but also greatly improve the working efficiency of the engine.

[0052] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle, comprising a front valve (3) and a rear valve (10), characterized in that: A front door connecting seat (5) is provided on the front valve (3). One end of the front door connecting seat (5) is hinged with a front door connecting plate (2), and the other end of the front door connecting seat (5) is hinged with a front door pull rod (4). A front door rocker arm (1) is hinged on the front door pull rod (4). A rear door connecting seat (9) is fixedly connected to the rear valve (10), and a rear door connecting plate (7) is fixedly connected to the rear valve (10). A rear door pull rod (12) is hinged on the rear door connecting seat (9), and a rear door rocker arm (11) is hinged on the rear door pull rod (12).

2. The valve mechanism for controllable heat dissipation of the nacelle of a low-speed UAV engine according to claim 1, characterized in that: Connectors (401) are threadedly connected to both ends of the front door pull rod (4), and double nuts are provided at the connection part between the connector (401) and the front door pull rod (4).

3. The valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle according to claim 1, characterized in that: The front door rocker arm (1) is tapered, the two ends of the front door rocker arm (1) are rounded, a weight reduction hole (101) is formed in the front door rocker arm (1), reinforcing ribs (102) are provided on the front door rocker arm (1), and the front door rocker arm (1) is hinged with the connector (401).

4. A valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle according to claim 1, characterized in that: The front door connecting seat (5) includes a first support plate (501). A front door installation groove (502) is formed in the first support plate (501), and the front door installation groove (502) is fixedly connected to the front valve (3). A first connection part (503) is provided on the first support plate (501), and the first connection part (503) is hinged with the connector (401).

5. The valve mechanism for controllable heat dissipation of the nacelle of a low-speed UAV engine according to claim 1, characterized in that: A front door support seat (6) is provided on the front valve (3). The front door support seat (6) corresponds to the front door connecting seat (5), and the front door support seat (6) and the front door connecting seat (5) are symmetrically distributed.

6. The valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle according to claim 1, characterized in that: A front door skin (301) is provided on the front valve (3), and bending parts (302) are provided on both sides of the front door skin (301).

7. A valve mechanism for controllable heat dissipation of a nacelle of a low-speed UAV engine according to claim 1, characterized in that: A first connection plate (201) is fixedly connected to the front door connecting plate (2). The first connection plate (201) is provided on the front door connecting plate (2). The number of the first connection plates (201) is two. The two first connection plates (201) are symmetrically distributed, and the two first connection plates (201) are respectively hinged with the front door connecting seat (5) and the front door support seat (6).

8. The valve mechanism for controllable heat dissipation of the engine nacelle of a low-speed unmanned aerial vehicle according to claim 1, characterized in that: The rear door connecting seat (9) includes a second support plate (901). A rear door installation groove (902) is formed in the second support plate (901), and the rear door installation groove (902) is fixedly connected to the rear valve (10). A second connection part (903) is provided on the second support plate (901), and the second connection part (903) is hinged with the rear door pull rod (12).

9. The valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle according to claim 1, characterized in that: Rear door support seats (8) are provided on both sides of the rear valve (10). The rear door support seats (8) correspond to the rear door connecting seat (9). A hinge connecting piece (801) is bolted to the rear door support seat (8), and the hinge connecting piece (801) is hinged with the rear door connecting plate (7).

10. The valve mechanism for controllable heat dissipation of a low-speed UAV engine nacelle according to claim 1, characterized in that: A rear door skin (1001) is provided on the rear valve (10), and the rear door skin (1001) is fixedly connected to the rear door connecting seat (9) and the rear door support seat (8) respectively.

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