A two-way vent valve for UAV fuel tank

Abstract

The present invention relates to the technical field of vent valves, and specifically to a two-way vent valve for a fuel tank of an unmanned aerial vehicle, comprising a mounting plate, a through hole being provided in the middle of the mounting plate, the mounting plate being mounted on the outer wall of a fuel tank body, the through hole in the middle of the mounting plate corresponding to the fuel tank port on the fuel tank body, the outer wall of the mounting plate being fixedly connected with a valve body, and further comprising a bellows, a connecting rod and a vent groove. In the present invention, when the attitude of the unmanned aerial vehicle changes, under the traction of the counterweight, the connecting rod will rotate and maintain a vertical state, thereby pushing the bellows, so that the upper end of the bellows always maintains a vertical upward state, that is, the pressure relief valve is at the highest point, to avoid oil staining at the pressure relief valve, and also to avoid the oil from spraying out of the pressure relief valve due to the change in the flight attitude of the unmanned aerial vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of vent valves, and in particular to a two-way vent valve for a fuel tank of an unmanned aerial vehicle. Background Art

[0002] More and more UAVs choose to use hard fixed fuel tanks because of their advantages such as light weight, large fuel capacity, and good reliability. However, compared with traditional soft fuel tanks, hard fixed fuel tanks cannot be deformed, so there is a problem of fuel consumption and air pressure balance. In short, in a closed fuel tank environment, when the fuel of the UAV is consumed in large quantities or the external air pressure increases significantly (the flight altitude is greatly reduced, etc.), there is a negative pressure between the UAV fuel tank and the external atmosphere. At this time, the engine will have difficulty absorbing fuel and the UAV fuel tank will be under contraction pressure; when the fuel of the UAV evaporates in large quantities or the external air pressure decreases significantly (the flight altitude is greatly increased, etc.), there is a positive pressure between the UAV fuel tank and the external atmosphere. At this time, the engine is easy or too easy to absorb fuel and the UAV fuel tank will be under expansion pressure.

[0003] The prior art discloses a two-way vent valve for a UAV fuel tank with publication number CN109854792A, which can adapt to more working conditions and better meet the use requirements of the UAV; and can trigger the function of forced pressure balance to maintain short-term continuous high-flow ventilation of the fuel tank, thereby preventing the ventilation holes from being continuously open during the flight of the UAV and mixing in rainwater or debris.

[0004] However, when a drone is flying, its posture is constantly changing and it will be tilted. The vibration during flight will also cause the oil inside the tank to move, causing residual oil on the valve, which will be discharged along with the air during pressure relief, causing more oil to flow out of the tank, which can easily cause some safety accidents. Summary of the invention

[0005] In order to solve the problems in the background technology, the present invention proposes a two-way vent valve for a fuel tank of an unmanned aerial vehicle.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A two-way vent valve for a fuel tank of an unmanned aerial vehicle comprises a mounting plate, a through hole is provided in the middle of the mounting plate, the mounting plate is mounted on the outer wall of a fuel tank body, the through hole in the middle of the mounting plate corresponds to the fuel tank port on the fuel tank body, the outer wall of the mounting plate is fixedly connected with a valve body, and further comprises: a bellows for quickly balancing the pressure difference between the inside and outside of the fuel tank body, the bellows is arranged on the inner side of the valve body, one end of the bellows is closed, the other end of the bellows is fixedly connected with an inner retaining ring, the outer wall of the inner retaining ring is fixedly connected with the inner wall of the valve body, a plurality of constant pressure intake valves are fixedly connected to the inner retaining ring, and a pressure relief valve is fixedly installed on the upper end of the bellows; a connecting rod is used to push the upper end of the bellows to maintain a vertical state, the middle part of the connecting rod is movably connected with the inner retaining ring through a fixed frame, and the lower end of the connecting rod is fixedly connected with a counterweight; and a venting groove, the venting groove is arranged on the outer wall of the valve body, and the outer wall of the valve body is fixedly connected with a rain cover.

[0008] Preferably, a connecting ball is fixedly connected to the middle portion of the connecting rod, a mounting sleeve is movably connected to the outer wall of the connecting ball, and the outer wall of the mounting sleeve is fixedly connected to the inner retaining ring.

[0009] Preferably, the upper end of the connecting rod is fixedly connected with a shield, the inner wall of the shield is fixedly connected with a first spring, the upper end of the first spring is fixedly connected to the top of the bellows, and the outer wall of the shield is provided with a plurality of evenly distributed dividing grooves.

[0010] Preferably, the pressure relief valve is provided with an air vent running through it from top to bottom, a filter is fixedly connected to the top of the air vent, an exhaust baffle is fixedly connected to the inner wall of the bottom of the air vent, the top of the exhaust baffle is hinged to a valve plate via a hinged frame, the top of the valve plate is fixedly connected to a second spring, the top of the second spring is fixedly connected to a mounting frame, and the mounting frame is fixedly connected to the inner wall of the air vent.

[0011] Preferably, a movable ring is fixedly connected to the inner wall of the exhaust baffle, the cross-section of the movable ring is an "inverted L-shaped" structure, a sealing ring is fixedly connected to the inner side of the movable ring, a protrusion is fixedly connected to the bottom of the valve plate, and the outer wall of the protrusion is in contact with the inner side of the sealing ring.

[0012] Preferably, a vertical slide groove is provided on the inner side of the exhaust baffle, and a first rack is slidably connected to the inner wall of the vertical slide groove. The outer wall of the first rack is fixedly connected to the outer wall of the movable ring through a sliding block, and the movable ring can be slidably connected to the inner side of the vertical slide groove.

[0013] Preferably, a mounting groove is provided inside the exhaust baffle, and the mounting groove is communicated with the inside of the vertical slide groove. A large gear is rotatably connected inside the mounting groove, and the outer wall of the large gear is meshed with the first rack. A small gear is fixedly connected to the shaft of the large gear, and a second vertically arranged rack is slidably connected inside the mounting groove, and the second rack is meshed with the small gear. The upper end of the second rack is movably connected to the bottom of the valve plate.

[0014] Preferably, a horizontally arranged limiting groove is opened at the bottom of the valve plate, a sliding column is fixedly connected to the top of the second rack, and the second rack is slidably connected to the inner wall of the limiting groove through the sliding column.

[0015] Compared with the existing technology, the present invention has the following beneficial effects:

[0016] 1. When the attitude of the drone changes, the connecting rod will rotate under the traction of the counterweight and remain in a vertical state, thereby pushing the bellows so that the upper end of the bellows always remains in a vertical upward state, that is, the pressure relief valve is at the highest point, avoiding oil from sticking to the pressure relief valve and preventing oil from spraying out of the pressure relief valve due to the change of the drone's flight attitude;

[0017] 2. Oil tank port: When the valve plate rotates along the hinged frame, the second rack will be lifted upward, thereby driving the small gear to rotate. The small gear will rotate with the large gear, and the large gear will drive the first rack to slide downward. The setting of the small gear and the large gear can drive the first rack to move downward a longer distance when the second rack is lifted upward a short distance, and the first rack drives the movable ring to move downward through the slider, that is, when the valve plate is lifted upward to release pressure, it will drive the movable ring to move downward to prevent the oil adhered to the movable ring from entering the interior of the pressure relief valve under the influence of airflow and leaking out through the pressure relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the installation schematic diagram of the present invention;

[0019] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0020] Figure 3 It is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the bellows of the present invention;

[0022] Figure 5 It is a schematic diagram of the internal structure of the bellows of the present invention;

[0023] Figure 6 The present invention Figure 2A schematic diagram of the structure enlargement at the center A;

[0024] Figure 7 The present invention Figure 6 A schematic diagram of the structure enlarged at B in the middle;

[0025] Figure 8 The present invention Figure 6 Enlarged schematic diagram of the structure at C in the middle.

[0026] In the figure: 1. fuel tank body; 2. fuel tank port; 3. mounting plate; 4. valve body; 5. inner retaining ring; 6. bellows; 7. pressure relief valve; 8. mounting sleeve; 9. fixing frame; 10. connecting rod; 11. connecting ball; 12. counterweight; 13. retaining cover; 14. first spring; 15. constant pressure intake valve; 16. partition groove; 17. breathable groove; 18. rain cover; 19. mounting frame; 20. second spring; 21. valve plate; 22. exhaust partition; 23. movable ring; 24. sealing ring; 25. hinged frame; 26. vertical slide groove; 27. slider; 28. first rack; 29. ​​mounting groove; 30. large gear; 31. small gear; 32. second rack; 33. limit groove; 34. bump; 35. filter screen. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] Reference Figure 1 - Figure 8A two-way vent valve for a fuel tank of an unmanned aerial vehicle comprises a mounting plate 3, a through hole is provided in the middle of the mounting plate 3, the mounting plate 3 is mounted on the outer wall of a fuel tank body 1, the through hole in the middle of the mounting plate 3 corresponds to the fuel tank port 2 on the fuel tank body 1, a valve body 4 is fixedly connected to the outer wall of the mounting plate 3, and further comprises: a bellows 6 for quickly balancing the pressure difference between the inside and outside of the fuel tank body 1, the bellows 6 is arranged on the inner side of the valve body 4, one end of the bellows 6 is closed, and the other end of the bellows 6 is fixedly connected to an inner retaining ring 5, the inner retaining ring The outer wall of the ring 5 is fixedly connected to the inner wall of the valve body 4, a plurality of constant pressure intake valves 15 are fixedly connected to the inner retaining ring 5, and a pressure relief valve 7 is fixedly installed on the upper end of the bellows 6; a connecting rod 10 is used to push the upper end of the bellows 6 to maintain a vertical state, the middle part of the connecting rod 10 is movably connected to the inner retaining ring 5 through a set fixing frame 9, and a counterweight block 12 is fixedly connected to the lower end of the connecting rod 10; and a ventilation groove 17, the ventilation groove 17 is opened on the outer wall of the valve body 4, and a rain cover 18 is fixedly connected to the outer wall of the valve body 4.

[0030] When in use, when the air pressure inside the fuel tank body 1 is greater than the atmospheric pressure, the bellows 6 will be compressed and stretched, thereby quickly relieving the air pressure. When the air pressure continues to increase, the gas will leak out from the pressure relief valve 7, and when the air pressure inside the fuel tank body 1 is lower than the atmospheric pressure, the bellows 6 will contract, thereby quickly relieving the air pressure. The gas will pass through the constant pressure inlet valve 15 into the interior of the fuel tank body 1 to ensure the stability of the air pressure inside the fuel tank body 1. Moreover, when the attitude of the drone changes, under the traction of the counterweight 12, the connecting rod 10 will rotate and maintain a vertical state, thereby pushing the bellows 6 so that the upper end of the bellows 6 always remains in a vertical upward state, that is, the pressure relief valve 7 is at the highest point, to avoid oil stains on the pressure relief valve 7, and to avoid the oil spraying from the pressure relief valve 7 due to the change of the flight attitude of the drone.

[0031] Specifically, a connecting ball 11 is fixedly connected to the middle part of the connecting rod 10, and the outer wall of the connecting ball 11 is movably connected to the mounting sleeve 8, and the outer wall of the mounting sleeve 8 is fixedly connected to the inner retaining ring 5. The upper end of the connecting rod 10 is fixedly connected to a baffle 13, and the inner wall of the baffle 13 is fixedly connected to a first spring 14, and the upper end of the first spring 14 is fixedly connected to the top of the bellows 6. The outer wall of the baffle 13 is provided with a plurality of evenly distributed partition grooves 16.

[0032] In this embodiment, the first spring 14 is provided to support the bellows 6 to prevent the bellows 6 from shrinking or expanding too much, and a shield 13 is provided to support the bellows 6 when the connecting rod 10 is skewed. The first spring 14 plays a role in assisting in pulling the top of the bellows 6.

[0033] Specifically, the interior of the pressure relief valve 7 is provided with an air vent which runs through from top to bottom, a filter screen 35 is fixedly connected to the top of the air vent, an exhaust baffle 22 is fixedly connected to the inner wall of the bottom of the air vent, the top of the exhaust baffle 22 is hinged to a valve plate 21 via a hinged frame 25, the top of the valve plate 21 is fixedly connected to a second spring 20, the top of the second spring 20 is fixedly connected to a mounting frame 19, and the mounting frame 19 is fixedly connected to the inner wall of the air vent.

[0034] In this embodiment, when the air pressure inside the fuel tank body 1 is too high, the air pressure will push the valve plate 21, causing the valve plate 21 to lift upward along the hinge and squeeze the second spring 20, resulting in a gap between the valve plate 21 and the exhaust baffle 22, and the gas is discharged through the gap and discharged from the filter 35.

[0035] Specifically, the inner wall of the exhaust baffle 22 is fixedly connected with a movable ring 23, the cross section of the movable ring 23 is an "inverted L-shaped" structure, the inner side of the movable ring 23 is fixedly connected with a sealing ring 24, the bottom of the valve plate 21 is fixedly connected with a protrusion 34, the outer wall of the protrusion 34 contacts the inner side of the sealing ring 24, the inner side of the exhaust baffle 22 is provided with a vertical slide groove 26, the inner wall of the vertical slide groove 26 is slidably connected with a first rack 28, the outer wall of the first rack 28 is fixedly connected to the outer wall of the movable ring 23 through a slider 27, the movable ring 23 can be slidably connected to the inner side of the vertical slide groove 26, and the exhaust baffle 22 is provided with a mounting plate 26. Slot 29, the mounting slot 29 is connected to the inside of the vertical slide slot 26, the inside of the mounting slot 29 is rotatably connected with a large gear 30, the outer wall of the large gear 30 is meshed with the first rack 28, a small gear 31 is fixedly connected to the shaft of the large gear 30, the inside of the mounting slot 29 is slidably connected with a vertically arranged second rack 32, the second rack 32 is meshed with the small gear 31, the upper end of the second rack 32 is movably connected to the bottom of the valve plate 21, a horizontally arranged limit slot 33 is opened at the bottom of the valve plate 21, the top of the second rack 32 is fixedly connected with a sliding column, and the second rack 32 is slidably connected to the inner wall of the limit slot 33 through the arranged sliding column.

[0036] In the present embodiment, when the valve plate 21 rotates along the hinged frame 25, the second rack 32 will be lifted upward, thereby driving the pinion 31 to rotate, and the pinion 31 will rotate together with the large gear 30, and the large gear 30 drives the first rack 28 to slide downward. The arrangement of the pinion 31 and the large gear 30 can drive the first rack 28 to move downward a greater distance when the second rack 32 is lifted upward a short distance, and the first rack 28 drives the movable ring 23 to move downward through the slider 27, that is, when the valve plate 21 is lifted upward to release pressure, it will drive the movable ring 23 to move downward, preventing the oil adhered to the movable ring 23 from entering the interior of the pressure relief valve 7 under the influence of the airflow and leaking out through the pressure relief valve 7.

[0037] Working principle: When the air pressure inside the fuel tank body 1 is greater than the atmospheric pressure, the bellows 6 will be compressed and stretched, thereby quickly relieving the air pressure. When the air pressure continues to increase, the gas will leak out from the pressure relief valve 7. When the air pressure inside the fuel tank body 1 is lower than the atmospheric pressure, the bellows 6 will contract, thereby quickly relieving the air pressure. The gas will pass through the constant pressure inlet valve 15 into the interior of the fuel tank body 1 to ensure the stability of the air pressure inside the fuel tank body 1. Moreover, when the attitude of the drone changes, under the traction of the counterweight 12, the connecting rod 10 will rotate and maintain a vertical state, thereby pushing the bellows 6 so that the upper end of the bellows 6 always remains in a vertical upward state, that is, the pressure relief valve 7 is at the highest point, to avoid oil stains on the pressure relief valve 7, and to avoid the oil from spraying out of the pressure relief valve 7 due to changes in the flight attitude of the drone.

[0038] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A two-way vent valve for a fuel tank of an unmanned aerial vehicle, comprising a mounting plate (3), a through hole being formed in the middle of the mounting plate (3), the mounting plate (3) being mounted on the outer wall of a fuel tank body (1), the through hole in the middle of the mounting plate (3) corresponding to a fuel tank port (2) on the fuel tank body (1), the outer wall of the mounting plate (3) being fixedly connected to a valve body (4), characterized in that: Also includes: A bellows (6) is used to quickly balance the pressure difference between the inside and outside of the oil tank body (1); the bellows (6) is arranged on the inner side of the valve body (4); one end of the bellows (6) is closed; the other end of the bellows (6) is fixedly connected to an inner retaining ring (5); the outer wall of the inner retaining ring (5) is fixedly connected to the inner wall of the valve body (4); a plurality of constant pressure intake valves (15) are fixedly connected to the inner retaining ring (5); and a pressure relief valve (7) is fixedly installed on the upper end of the bellows (6); A connecting rod (10) is used to push the upper end of the bellows (6) to maintain a vertical state, the middle portion of the connecting rod (10) is movably connected to the inner retaining ring (5) via a fixed frame (9), and the lower end of the connecting rod (10) is fixedly connected to a counterweight (12); and a vent groove (17), wherein the vent groove (17) is formed on the outer wall of the valve body (4), and a rain cover (18) is fixedly connected to the outer wall of the valve body (4); The pressure relief valve (7) has an air vent extending vertically therethrough, the top of the air vent is fixedly connected to a filter screen (35), the inner wall of the bottom of the air vent is fixedly connected to an exhaust baffle (22), the top of the exhaust baffle (22) is hingedly connected to a valve plate (21) via a hinged frame (25), the top of the valve plate (21) is fixedly connected to a second spring (20), the top of the second spring (20) is fixedly connected to a mounting frame (19), and the mounting frame (19) is fixedly connected to the inner wall of the air vent; A movable ring (23) is fixedly connected to the inner wall of the exhaust baffle (22), the cross section of the movable ring (23) being an "inverted L-shaped" structure, a sealing ring (24) is fixedly connected to the inner side of the movable ring (23), a protrusion (34) is fixedly connected to the bottom of the valve plate (21), and the outer wall of the protrusion (34) is in contact with the inner side of the sealing ring (24); A vertical slide groove (26) is provided on the inner side of the exhaust baffle (22); a first rack (28) is slidably connected to the inner wall of the vertical slide groove (26); an outer wall of the first rack (28) is fixedly connected to the outer wall of the movable ring (23) via a sliding block (27); and the movable ring (23) can be slidably connected to the inner side of the vertical slide groove (26).

2. The two-way vent valve for a UAV fuel tank according to claim 1, characterized in that: A connecting ball (11) is fixedly connected to the middle of the connecting rod (10), a mounting sleeve (8) is movably connected to the outer wall of the connecting ball (11), and the outer wall of the mounting sleeve (8) is fixedly connected to the inner retaining ring (5).

3. The two-way vent valve for a UAV fuel tank according to claim 1 is characterized in that: The upper end of the connecting rod (10) is fixedly connected to a baffle (13), the inner wall of the baffle (13) is fixedly connected to a first spring (14), the upper end of the first spring (14) is fixedly connected to the top of the bellows (6), and the outer wall of the baffle (13) is provided with a plurality of evenly distributed separation grooves (16).

4. The two-way vent valve for a UAV fuel tank according to claim 1, characterized in that: The exhaust baffle (22) is provided with a mounting groove (29) inside, the mounting groove (29) is communicated with the inside of the vertical slide groove (26), a large gear (30) is rotatably connected inside the mounting groove (29), the outer wall of the large gear (30) is meshed with the first rack (28), a small gear (31) is fixedly connected to the shaft of the large gear (30), a second vertically arranged rack (32) is slidably connected inside the mounting groove (29), the second rack (32) is meshed with the small gear (31), and the upper end of the second rack (32) is movably connected to the bottom of the valve plate (21).

5. The two-way vent valve for an unmanned aerial vehicle fuel tank according to claim 4, characterized in that: A horizontally arranged limiting groove (33) is provided at the bottom of the valve plate (21), a sliding column is fixedly connected to the top of the second rack (32), and the second rack (32) is slidably connected to the inner wall of the limiting groove (33) via the provided sliding column.

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