Turning plate type stop valve, unmanned aerial vehicle and oil mixing rate control method of unmanned aerial vehicle

Abstract

The invention discloses a turning plate type cut-off valve, an unmanned aerial vehicle and an oil mixing rate control method of the unmanned aerial vehicle, and belongs to the field of unmanned aerial vehicles. The turning plate type cut-off valve comprises a base, a cover plate, a valve rod, a rotating part, a traction rope and a first spring; the base is arranged on the surface of the side, facing the main oil tank, in the partition plate, a penetrating hole is formed in the base and communicates with the through hole, the cover plate is rotationally connected with the base, and the first spring is used for providing elastic acting force for the cover plate so that the cover plate can be pressed on the base and seal the penetrating hole; the valve rod is installed on the side wall of the main oil tank and rotationally connected with the main oil tank, the rotating part is fixedly connected with the valve rod, one end of the pulling rope is connected with the rotating part, the other end of the pulling rope is connected with the cover plate, the valve rod drives the rotating part to rotate when rotating, and the rotating part drives the cover plate to rotate away from the base through the pulling rope when rotating so that the main oil tank can be communicated with the auxiliary oil tank. Therefore, the sealing performance of the turning plate type stop valve can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of unmanned aerial vehicles, and in particular relates to a flap-type cut-off valve, an unmanned aerial vehicle and an oil flow rate control method thereof. Background Art

[0002] With the development of drone technology, drones have gradually come into people's view and play an important role in surveying and mapping, aerial photography, agriculture, rescue and other fields.

[0003] Usually, the fuel system of a UAV includes a main fuel tank, an auxiliary fuel tank and a cut-off valve. A partition is provided between the main fuel tank and the auxiliary fuel tank. A through hole is provided on the partition for connecting the main fuel tank and the auxiliary fuel tank. The cut-off valve is provided on the partition and is used to seal the through hole. When the UAV performs a long-range mission and requires oil to flow between the main fuel tank and the auxiliary fuel tank, the cut-off valve can be in an open state so that oil can flow between the main fuel tank and the auxiliary fuel tank through the through hole. When the UAV performs a short-range mission, there is no need to flow oil between the main fuel tank and the auxiliary fuel tank. At this time, the cut-off valve can be in a closed state so that oil cannot flow between the main fuel tank and the auxiliary fuel tank through the through hole.

[0004] A common shut-off valve includes a valve body and a valve stem. The valve body is mounted on the side wall of the main oil tank, and a seal is provided on the valve stem. With this structure, the valve stem can drive the seal to move toward the partition so that the seal is tightly attached to the periphery of the through hole on the partition to achieve sealing, or the valve stem can drive the seal to move away from the partition so that oil can flow through the through hole between the main oil tank and the auxiliary oil tank. However, when the partition is tilted relative to the side wall of the main oil tank, during the process of the valve stem driving the seal to move toward the partition for sealing, due to the angle between the partition and the seal, the sealing effect between the partition and the seal is poor, which in turn leads to poor sealing performance of the shut-off valve. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a flap-type cut-off valve, a drone and an oil flow rate control method thereof. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] In the first aspect, the present invention provides a flap-type shut-off valve, which is used for on-off control between a main fuel tank and an auxiliary fuel tank in a fuel system of an unmanned aerial vehicle. A partition is provided between the main fuel tank and the auxiliary fuel tank, and a through hole is provided on the partition for connecting the main fuel tank and the auxiliary fuel tank. The flap-type shut-off valve comprises a base, a cover plate, a valve stem, a rotating part, a traction rope and a first spring; the base is arranged on the surface of the partition facing the main fuel tank side, and a through hole is provided on the base, and the through hole is connected to the through hole, and the cover plate is rotatably connected to the base, and the first spring is used to provide an elastic force for the cover plate so that the cover plate is pressed tightly against the base and seals the through hole; the valve stem is installed on the side wall of the main fuel tank and is rotatably connected to the main fuel tank, the rotating part and the valve stem are fixedly connected, one end of the traction rope is connected to the rotating part, and the other end is connected to the cover plate, when the valve stem rotates, it drives the rotating part to rotate, and when the rotating part rotates, it drives the cover plate to rotate away from the base through the traction rope, so that the main fuel tank and the auxiliary fuel tank are connected.

[0007] In one embodiment of the present invention, it also includes a mounting seat and a handle, the mounting seat is fixedly connected to the side wall of the main oil tank, the side wall of the main oil tank is provided with a mounting hole, the mounting seat is provided with a positioning hole, the positioning hole and the mounting hole are coaxially arranged, the first end of the valve stem is connected to the rotating member, the second end of the valve stem passes through the positioning hole and extends to the outside of the main oil tank, and the handle is installed on the second end of the valve stem.

[0008] In one embodiment of the present invention, a second spring is further included. The second spring is arranged between the handle and the mounting seat. When the handle rotates along the first direction, pressure is applied to the second spring to cause elastic deformation of the second spring.

[0009] In one embodiment of the present invention, it also includes an annular positioning member, which is fixedly connected to the mounting seat, and the annular positioning member and the positioning hole are coaxially arranged; a slot is provided on the annular positioning member, and a claw is provided on the handle. When the handle rotates, the claw and the slot are engaged to limit the rotation of the handle along the second direction, and the first direction and the second direction are opposite.

[0010] In one embodiment of the present invention, the claw is rotatably connected to the handle, and a third spring is provided between the claw and the handle. The third spring is used to apply an elastic force to the claw so that the claw is pressed tightly into the slot.

[0011] In one embodiment of the present invention, a plurality of protrusions are provided on the claw, and the groove is a sawtooth groove, which includes a plurality of tooth grooves distributed in sequence along the circumference of the annular positioning member, the number of the tooth grooves is greater than the number of the protrusions, and the protrusions and the tooth grooves are snap-fitted together; a limit block is provided on the annular positioning member, and the limit block is limited along the circumference of the annular positioning member and cooperates with the claw to limit excessive rotation of the handle, and a guide inclined surface is provided on the tooth groove to facilitate the rotation of the claw in the first direction, and the guide inclined surface faces the side away from the limit block.

[0012] In one embodiment of the present invention, the rotating member is a cam, the axis of the cam is provided with an axial hole, one end of the valve stem is inserted into and fixed in the axial hole, and the protruding portion of the cam is connected to the traction rope.

[0013] In one embodiment of the present invention, the cover plate is arranged along the height direction of the partition plate, and the end of the cover plate connected to the base is higher than the end connected to the traction rope, and the protrusion of the cam faces the through hole.

[0014] In one embodiment of the present invention, a sealing ring is provided between the base and the cover plate, the sealing ring is nested in the outer periphery of the perforation, and the first spring applies an elastic force to the cover plate so that the cover plate presses the sealing ring against the base to achieve sealing.

[0015] In a second aspect, the present invention provides an unmanned aerial vehicle, comprising a fuel system and a flap-type shut-off valve as provided in the above scheme, wherein the fuel system comprises a main fuel tank and an auxiliary fuel tank, a partition is provided between the main fuel tank and the auxiliary fuel tank, a through hole for connecting the main fuel tank and the auxiliary fuel tank is provided on the partition, and the flap-type shut-off valve is arranged on the partition and used to seal the through hole; the fuel system of the unmanned aerial vehicle also comprises a center of gravity detection device and a processor, the center of gravity detection device is used to detect the center of gravity position data of the unmanned aerial vehicle, the center of gravity detection device and the processor are electrically connected, and the processor is used to judge the degree of center of gravity deviation of the unmanned aerial vehicle based on the center of gravity position data.

[0016] In a third aspect, the present invention provides a method for controlling the oil flow rate of a drone, including the drone provided in the above scheme, the drone including a fuel system and a flap-type cut-off valve, the fuel system including a main fuel tank and a secondary fuel tank, the flap-type cut-off valve including a handle, a valve stem, a traction rope, a cover plate and a base, the method comprising:

[0017] The valve stem is controlled to rotate in a first direction by a handle, and when the valve stem rotates, the cover plate is driven to move toward a side away from the base by a traction rope, so that the main oil tank and the auxiliary oil tank are connected through the through hole on the base;

[0018] Detecting the first center of gravity position data of the drone at the first time by using the center of gravity detection device;

[0019] Detecting the second center of gravity position data of the drone at a second time by the center of gravity detection device;

[0020] Calculating, by a processor, a difference between the first center of gravity position data and the second center of gravity position data;

[0021] The processor compares the difference with a set threshold value, and when the difference is greater than the set threshold value, the control handle rotates in a second direction, and the first direction is opposite to the second direction.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the above scheme of the present application, the flap cut-off valve includes a base, a cover plate, a valve stem, a rotating member, a traction rope and a first spring; the base is arranged on the surface of the partition plate facing the main oil tank side, the base is provided with a perforation, the perforation is connected with the through hole, the cover plate and the base are rotatably connected, and the first spring is used to provide an elastic force for the cover plate, so that the cover plate is pressed against the base and the perforation is sealed; the valve stem is installed on the side wall of the main oil tank and is rotatably connected with the main oil tank, the rotating member and the valve stem are fixedly connected, one end of the traction rope is connected with the rotating member, and the other end is connected with the cover plate. With this structure, when the valve stem rotates, the valve stem can drive the rotating member to rotate, and when the rotating member rotates, the cover plate can be driven to rotate away from the base through the traction rope, so that the main oil tank and the auxiliary oil tank are connected, so that the main oil tank and the auxiliary oil tank can be connected, so that oil can be mixed between the main oil tank and the auxiliary oil tank through the perforation; when the valve stem is loosened, the first spring can provide an elastic force for the cover plate, so that the cover plate is pressed against the base and the perforation is sealed, so that oil can be mixed between the main oil tank and the auxiliary oil tank through the perforation. Furthermore, since the base is arranged on the partition and the valve stem is arranged on the side wall of the main oil tank, the cover plate on the base and the rotating part on the valve stem are connected by a flexible traction rope. Therefore, when the partition is tilted relative to the side wall of the main oil tank, the cover plate and the rotating part can adapt to the inclination of the partition through the offset of the traction rope, thereby improving the sealing effect between the cover plate and the base, and thereby improving the sealing performance of the flap type cut-off valve.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a flap type cut-off valve provided in an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of a flap-type cut-off valve provided in an embodiment of the present invention being arranged on a partition;

[0027] Figure 3 is a schematic diagram of a handle, a mounting seat and an annular positioning member in an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of a fuel leakage rate control method for a UAV provided by an embodiment of the present invention.

[0029] Figure numerals: 1-base, 2-cover plate, 3-valve stem, 4-rotating member, 5-traction rope, 6-first spring, 7-mounting seat, 8-handle, 9-annular positioning member, 10-slot, 11-claw, 12-partition. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0031] Embodiment 1:

[0032] See also Figure 1 and Figure 2 The embodiment of the present invention provides a flap-type cut-off valve, which is used for on-off control between the main fuel tank and the auxiliary fuel tank in the fuel system of an unmanned aerial vehicle. A partition 12 is provided between the main fuel tank and the auxiliary fuel tank, and a through hole for connecting the main fuel tank and the auxiliary fuel tank is provided on the partition 12. The flap-type cut-off valve includes a base 1, a cover plate 2, a valve stem 3, a rotating member 4, a traction rope 5 and a first spring 6; the base 1 is arranged on the surface of the partition plate 12 facing the main fuel tank side, and a through hole is provided on the base 1, and the through hole is connected to the through hole, and the cover The plate 2 is rotatably connected to the base 1, and the first spring 6 is used to provide an elastic force for the cover plate 2 so that the cover plate 2 is pressed against the base 1 and seals the perforation; the valve stem 3 is installed on the side wall of the main oil tank and is rotatably connected to the main oil tank, the rotating part 4 and the valve stem 3 are fixedly connected, one end of the traction rope 5 is connected to the rotating part 4, and the other end is connected to the cover plate 2, when the valve stem 3 rotates, it drives the rotating part 4 to rotate, and when the rotating part 4 rotates, it drives the cover plate 2 to rotate away from the base 1 through the traction rope 5, so that the main oil tank and the auxiliary oil tank are connected.

[0033] In some embodiments of the present application, a structural fuel tank is provided in the fuel system of the drone, and the structural fuel tank has a containing cavity for containing oil. A partition 12 is provided in the structural fuel tank, and the partition 12 separates the containing cavity into a main fuel tank and an auxiliary fuel tank.

[0034] In some embodiments of the present application, the base 1 and the partition 12 are fastened by bolts. The base 1 is a disc-shaped structure, and four connecting protrusions are fixed on the base 1. The four connecting protrusions are evenly distributed along the circumference of the disc-shaped structure, and the four connecting protrusions are provided with threaded fastening holes. In this way, the four threaded fasteners can pass through the threaded fastening holes on the four connecting protrusions respectively to lock the base 1 on the partition 12.

[0035] In some embodiments of the present application, a sealing ring is provided between the base 1 and the partition 12, a through hole is provided at the axis of the base 1, the sealing ring is nested in the outer periphery of the through hole, and an annular groove for fixing the sealing ring is provided on the base 1.

[0036] In some embodiments of the present application, one end of the cover plate 2 is provided with two relatively arranged protruding ears, and the two protruding ears are each provided with a first axial hole. The base 1 is provided with two positioning ears, and the two protruding ears are located between the two positioning ears. The two positioning ears are each provided with a second axial hole. A rotating shaft is provided between the cover plate 2 and the base 1, and the rotating shaft is inserted into the first axial hole and the second axial hole at the same time, so that a rotational connection is achieved between the cover plate 2 and the base 1.

[0037] In some embodiments of the present application, the first spring 6 is a torsion spring, which is sleeved on the outer circumference of the rotating shaft, and the extended section at one end of the torsion spring presses against the cover plate 2 , and the extended section at the other end presses against the base 1 .

[0038] In some embodiments of the present application, a connecting block is provided at one end of the cover plate 2 close to the traction rope 5, the connecting block is rotatably connected to the cover plate 2, and one end of the traction rope 5 is connected to the connecting block.

[0039] In some embodiments of the present application, the traction rope 5 includes a rope body and a locking buckle. Rope holes are provided on the rotating member 4 and the connecting block. The end of the rope body extends out through the rope hole and is locked to the rope body by the locking buckle, making the traction rope 5 more convenient to install and improving the stability of the connection between the traction rope 5 and the cover plate 2 and the rotating member 4.

[0040] In some embodiments of the present application, an elastic gasket is installed on the valve stem 3 , and the elastic gasket is located on the side of the rotating member 4 away from the handle 8 to prevent the rotating member 4 from separating from the valve stem 3 .

[0041] In some embodiments of the present application, the oil in the main oil tank can exert pressure on the cover plate 2 , thereby improving the sealing effect of the cover plate 2 on the perforations on the base 1 .

[0042] In the above scheme of the present application, the flap-type shut-off valve includes a base 1, a cover plate 2, a valve stem 3, a rotating member 4, a traction rope 5 and a first spring 6; the base 1 is arranged on the surface of the partition 12 facing the main oil tank side, and a perforation is provided on the base 1, and the perforation is connected to the through hole, the cover plate 2 and the base 1 are rotatably connected, and the first spring 6 is used to provide an elastic force for the cover plate 2 so that the cover plate 2 is pressed against the base 1 and seals the perforation; the valve stem 3 is installed on the side wall of the main oil tank and is rotatably connected to the main oil tank, the rotating member 4 and the valve stem 3 are fixedly connected, one end of the traction rope 5 is connected to the rotating member 4, and the other end is connected to the cover plate 2. With this structure, when the valve stem 3 rotates, the valve stem 3 can drive the rotating member 4 to rotate, and when the rotating member 4 rotates, the cover plate 2 can be driven to rotate away from the base 1 through the traction rope 5, so that the main oil tank and the auxiliary oil tank are connected, so that the main oil tank and the auxiliary oil tank can be connected through the perforation to achieve oil flow between them; when the valve stem 3 is loosened, the first spring 6 can provide an elastic force for the cover plate 2, so that the cover plate 2 is pressed against the base 1 and seals the perforation, so that the main oil tank and the auxiliary oil tank can be connected through the perforation. In addition, since the base 1 is arranged on the partition 12, the valve stem 3 is arranged on the side wall of the main oil tank, and the cover plate 2 on the base 1 and the rotating member 4 on the valve stem 3 are connected by a flexible traction rope 5, when the partition 12 is inclined relative to the side wall of the main oil tank, the cover plate 2 and the rotating member 4 can adapt to the inclination of the partition 12 through the offset of the traction rope 5, thereby improving the sealing effect between the cover plate 2 and the base 1, thereby improving the sealing performance of the flap-type cut-off valve.

[0043] In some embodiments of the present application, the flap-type shut-off valve further includes a mounting seat 7 and a handle 8, the mounting seat 7 is fixedly connected to the side wall of the main oil tank, a mounting hole is provided on the side wall of the main oil tank, a positioning hole is provided on the mounting seat 7, the positioning hole and the mounting hole are coaxially arranged, the first end of the valve stem 3 is connected to the rotating member 4, the second end of the valve stem 3 extends to the outside of the main oil tank through the positioning hole, and the handle 8 is installed on the second end of the valve stem 3. With this structure, the staff can control the rotation of the valve stem 3 by manually twisting the handle 8 outside the oil tank, and then control the rotation of the cover plate 2 to realize the opening or closing of the flap-type shut-off valve, making the control of the flap-type shut-off valve more convenient and simple. The valve stem 3 is rotatably connected to the side wall of the main oil tank through the mounting seat 7, which can improve the stability of the valve stem 3.

[0044] In some embodiments of the present application, a bearing is provided between the valve stem 3 and the positioning hole of the mounting seat 7, the inner ring of the bearing is sleeved on the valve stem 3, and the outer ring is sleeved in the positioning hole. In this way, the valve stem 3 can be rotatably connected to the mounting seat 7 through the bearing.

[0045] In some embodiments of the present application, a sealing ring is provided in the positioning hole of the mounting seat 7 to prevent impurities outside the main oil tank from entering the main oil tank through the positioning hole of the mounting seat 7 and causing oil contamination.

[0046] In some embodiments of the present application, two fastening holes are provided on both sides of the mounting seat 7, and two threaded fasteners pass through the two fastening holes and are threadedly connected to the main oil tank respectively.

[0047] In some embodiments of the present application, the handle 8 includes a rotating plate and a sleeve, the sleeve is sleeved outside the valve stem 3, the rotating plate includes a circular plate portion and an extension portion, the circular plate portion and the end of the sleeve are fixedly connected, one end of the extension portion is connected to the circular plate portion, and the other end extends radially along the circular plate portion, and the extension portion is provided with two and relatively arranged on both sides of the circular plate portion. The rotating plate is fastened to the end face of the valve stem 3 by bolts. In this way, the valve stem 3 can be controlled to rotate by manually screwing the extension portion.

[0048] In some embodiments of the present application, the flap-type shut-off valve further includes a second spring, which is disposed between the handle 8 and the mounting seat 7. When the handle 8 rotates in the first direction, pressure is applied to the second spring to cause elastic deformation of the second spring. With this structure, when the staff releases the handle 8, the handle 8 can be reversed to the initial position under the elastic force of the second spring, which is convenient for the secondary use of the handle 8. At the same time, after the staff releases the handle 8, the elastic force applied by the first spring 6 to the cover plate 2 can drive the cover plate 2 to rotate and press the base 1. Through the cooperation of the first spring 6 and the second spring, the cover plate 2 can be sealed faster and with better sealing effect, thereby making the flap-type shut-off valve faster and with better sealing effect when closed.

[0049] In some embodiments of the present application, the second spring is a torsion spring, one end of which is fixedly connected to the handle 8, and the other end of which is fixedly connected to the mounting seat 7. The torsion spring can be nested inside the sleeve.

[0050] In some embodiments of the present application, Figure 3 As shown, the flap-type cut-off valve also includes an annular positioning member 9, which is fixedly connected to the mounting seat 7, and the annular positioning member 9 and the positioning hole are coaxially arranged; a slot 10 is provided on the annular positioning member 9, and a claw 11 is provided on the handle 8. When the handle 8 rotates, the claw 11 and the slot 10 are engaged and matched to limit the rotation of the handle 8 along the second direction, and the first direction and the second direction are opposite. With this structure, the handle 8 can be fixed at a certain rotation angle by engaging and positioning the claw 11 and the slot 10, so that when the handle 8 rotates to the specified position, the staff can release the handle 8 without having to hold the handle 8 tightly to provide external force, which makes it more convenient for the staff to operate. At the same time, the rotation angle of the handle 8 is positioned by the claw 11 and the slot 10, so that the handle 8 can be rotated to the specified position, so that the opening angle and the size of the opening between the cover plate 2 and the base 1 can be controlled by controlling the rotation angle of the handle 8 and the valve stem 3, and then the oil flow rate between the main tank and the auxiliary tank can be controlled to avoid the center of gravity of the drone being shifted when the oil flow rate between the main tank and the auxiliary tank is too large, or to avoid the oil flow rate between the main tank and the auxiliary tank being too small to affect the oil supply of the auxiliary tank to the engine.

[0051] In some embodiments of the present application, the annular positioning member 9 is sleeved in the positioning hole of the mounting seat 7 , and the slot 10 is arranged on a side surface of the annular positioning member 9 close to the handle 8 , and the opening of the slot 10 faces the handle 8 .

[0052] In some embodiments of the present application, an arc block is fixed to the outer periphery of the sleeve in the handle 8, the claw 11 is an arc claw, the arc claw matches the outer periphery of the sleeve, and the arc claw corresponds to the annular positioning member 9. Along the axial direction of the sleeve, the projection of the arc claw coincides with the projection of the annular positioning member 9, or the projection of the arc claw is located within the projection of the annular positioning member 9, and one end of the arc claw is rotatably connected to the arc block.

[0053] In some embodiments of the present application, Figure 3 As shown, the claw 11 is rotatably connected to the handle 8, and a third spring is provided between the claw 11 and the handle 8, and the third spring is used to apply an elastic force to the claw 11 so that the claw 11 is pressed tightly into the slot 10. With this structure, the claw 11 is pressed tightly into the slot 10 by applying an elastic force to the claw 11 through the third spring, so as to prevent the handle 8 from rotating abnormally after the claw 11 is separated from the slot 10.

[0054] In some embodiments of the present application, the third spring may be a torsion spring.

[0055] In some embodiments of the present application, Figure 3 As shown, the claw 11 is provided with a plurality of protrusions, and the slot 10 is a sawtooth-shaped slot, which includes a plurality of tooth grooves distributed in sequence along the circumference of the annular positioning member 9, the number of tooth grooves is greater than the number of protrusions, and the protrusions and the tooth grooves are engaged with each other; the annular positioning member 9 is provided with a limit block, and the limit block is engaged with the claw 11 along the circumference of the annular positioning member 9 to limit excessive rotation of the handle 8, and the tooth groove is provided with a guiding inclined surface for facilitating the rotation of the claw 11 along the first direction, and the guiding inclined surface faces the side away from the limit block. With this structure, the stability of the engagement between the claw 11 and the slot 10 can be improved by engaging the plurality of protrusions with the plurality of tooth grooves respectively; the limit block is used to limit the claw 11, so as to avoid excessive rotation of the handle 8; the guide inclined surface is used to guide the movement of the claw 11, so that the claw 11 is more convenient to rotate along the first direction.

[0056] In some embodiments of the present application, the tooth groove is a right-angled triangular groove, the protrusion is a triangular protrusion, and the triangular protrusion matches the right-angled triangular groove.

[0057] In some embodiments of the present application, Figure 1 As shown, the rotating member 4 is a cam, the axis of the cam is provided with an axial hole, one end of the valve stem 3 is inserted and fixed in the axial hole, and the protruding part of the cam is connected to the traction rope 5. With this structure, when the valve stem 3 rotates, the cam can be driven to rotate, and when the cam rotates, the traction rope 5 can be driven to move and pull the cover plate 2 to open, so that the flap-type cut-off valve can be opened.

[0058] In some embodiments of the present application, Figure 2 As shown, the cover plate 2 is arranged along the height direction of the partition 12, and the end of the cover plate 2 connected to the base 1 is higher than the end connected to the traction rope 5, and the protrusion of the cam faces the through hole. With this structure, firstly, when the cover plate 2 is rotated to close, the self-weight of the cover plate 2 can apply a downward force to the cover plate 2, so that the cover plate 2 rotates and closes faster. Secondly, since the cover plate 2 is located on the upper side of the main oil tank, when the oil in the main oil tank is not full, the oil pressure on the cover plate 2 is small, which can ensure that the cover plate 2 can be sealed and avoid the opening of the cover plate 2 being affected by excessive oil pressure. In addition, when the protrusion of the cam faces the through hole, the cam can be rotated upward to open the cover plate 2, making it more convenient for the traction rope 5 to drive the cover plate 2 to move and open.

[0059] In some embodiments of the present application, a sealing ring is provided between the base 1 and the cover plate 2, the sealing ring is nested in the outer periphery of the perforation, and the first spring 6 applies an elastic force to the cover plate 2 so that the cover plate 2 presses the sealing ring against the base 1 to achieve sealing. With this structure, the sealing performance between the cover plate 2 and the base 1 can be improved, and oil leakage from the gap between the cover plate 2 and the base 1 can be prevented.

[0060] Embodiment 2:

[0061] An embodiment of the present invention provides an unmanned aerial vehicle, comprising a fuel system and a flap-type shut-off valve as in the above-mentioned embodiment 1, wherein the fuel system comprises a main fuel tank and an auxiliary fuel tank, a partition is provided between the main fuel tank and the auxiliary fuel tank, the partition is provided with a through hole for connecting the main fuel tank and the auxiliary fuel tank, and the flap-type shut-off valve is arranged on the partition and is used to seal the through hole; the fuel system of the unmanned aerial vehicle also comprises a center of gravity detection device and a processor, the center of gravity detection device is used to detect the center of gravity position data of the unmanned aerial vehicle, the center of gravity detection device and the processor are electrically connected, and the processor is used to judge the degree of center of gravity deviation of the unmanned aerial vehicle based on the center of gravity position data.

[0062] The beneficial effects of the second embodiment of the present invention and its various implementations can refer to the beneficial effects analysis in the first embodiment and its various implementations. In addition, in the second embodiment of the present invention, the center of gravity position data of the drone is detected by the center of gravity detection device, and the angle that the handle needs to be rotated is calculated by the processor based on the center of gravity position data, so that the rotation angle of the handle can be accurately obtained, and then the oil flow rate between the main fuel tank and the auxiliary fuel tank can be accurately controlled to avoid the center of gravity of the drone being shifted when the oil flow rate between the main fuel tank and the auxiliary fuel tank is too large, or to avoid the oil flow rate between the main fuel tank and the auxiliary fuel tank being too small to affect the oil supply of the auxiliary fuel tank to the engine, resulting in the drone being unable to fly normally.

[0063] In some embodiments of the present application, the center of gravity detection device is an existing detection device capable of detecting the center of gravity position of a drone, such as a Chinese invention patent with publication number CN112722253A, entitled A drone center of gravity detection device. Specifically, the center of gravity detection device in the embodiments of the present application may be a balancing instrument.

[0064] In some embodiments of the present application, the processor may be a microchip, such as a CPU. The processor is used to calculate the difference between the first center of gravity position data and the second center of gravity position data, and compare the difference with the set threshold value. Specifically, when the difference is less than the set threshold value, the center of gravity of the UAV is slightly offset, and there is no need to adjust the angle between the cover and the base. When the difference is greater than the set threshold value, the center of gravity of the UAV is more offset. At this time, it is necessary to adjust the angle between the cover and the base by screwing the handle to reduce the oil flow rate between the main tank and the auxiliary tank. Among them, the first center of gravity position data and the second center of gravity position data are both coordinate data, such as three-dimensional coordinate values. The set thresholds are all set values, which can be adjusted according to factors such as the model of the UAV and the use environment.

[0065] Embodiment three:

[0066] See also Figure 4The embodiment of the present invention provides a method for controlling the oil flow rate of an unmanned aerial vehicle, including the unmanned aerial vehicle provided in the above-mentioned embodiment 2, the unmanned aerial vehicle includes a fuel system and a flap-type cut-off valve, the fuel system includes a main fuel tank and an auxiliary fuel tank, the flap-type cut-off valve includes a handle, a valve stem, a traction rope, a cover plate and a base, and the method includes:

[0067] The valve stem is controlled to rotate in a first direction by a handle, and when the valve stem rotates, the cover plate is driven to move toward a side away from the base by a traction rope, so that the main oil tank and the auxiliary oil tank are connected through the through hole on the base;

[0068] Detecting the first center of gravity position data of the drone at the first time by using the center of gravity detection device;

[0069] Detecting the second center of gravity position data of the drone at a second time by the center of gravity detection device;

[0070] Calculating, by a processor, a difference between the first center of gravity position data and the second center of gravity position data;

[0071] The processor compares the difference with a set threshold value, and when the difference is greater than the set threshold value, the control handle rotates in a second direction, and the first direction is opposite to the second direction.

[0072] The beneficial effects of the third embodiment of the present invention and its various implementations can be analyzed with reference to the beneficial effects of the second embodiment and its various implementations, and will not be elaborated here.

[0073] In some embodiments of the present application, the first time and the second time are set times, which can be adaptively adjusted according to the start time of oil spill between the main fuel tank and the auxiliary fuel tank. The time difference between the first time and the second time can be 1s, 2s, 3s, etc.

[0074] In some embodiments of the present application, a liquid level sensor may be further provided in the auxiliary oil tank, and the liquid level position of the oil in the auxiliary oil tank may be detected by the liquid level sensor, wherein the above method further includes:

[0075] The first liquid level position data of the oil in the auxiliary oil tank is detected at the first time by the liquid level sensor;

[0076] The second liquid level position data of the oil in the auxiliary oil tank is detected by the liquid level sensor at a second time;

[0077] Calculating, by a processor, a difference between the first liquid level position data and the second liquid level position data;

[0078] The processor compares the difference with a set threshold value, and when the difference is less than the set threshold value, the control handle rotates in the first direction. In this way, when the auxiliary fuel tank is used to supply fuel to the engine of the drone, the normal operation of the engine can be avoided due to the slow oil flow rate between the main fuel tank and the auxiliary fuel tank.

[0079] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “rear”, “left”, “right”, “inner”, “outer”, “circumferential”, and “axial” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0080] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A flap-type cut-off valve, used for on-off control between a main tank and an auxiliary tank in a fuel system of an unmanned aerial vehicle, wherein a partition is provided between the main tank and the auxiliary tank, and a through hole is provided on the partition for connecting the main tank and the auxiliary tank, characterized in that: The flap-type cut-off valve comprises a base, a cover plate, a valve stem, a rotating member, a traction rope and a first spring; The base is arranged on the surface of the partition plate facing the main oil tank, the base is provided with a through hole, the through hole is communicated with the through hole, the cover plate is rotatably connected with the base, and the first spring is used to provide an elastic force for the cover plate so that the cover plate is pressed against the base and seals the through hole; The valve stem is installed on the side wall of the main oil tank and is rotatably connected to the main oil tank. The rotating part and the valve stem are fixedly connected. One end of the traction rope is connected to the rotating part, and the other end is connected to the cover plate. When the valve stem rotates, it drives the rotating part to rotate. When the rotating part rotates, the cover plate is driven to rotate away from the base through the traction rope, so that the main oil tank and the auxiliary oil tank are connected.

2. The flap type cut-off valve according to claim 1, characterized in that: It also includes a mounting seat and a handle, wherein the mounting seat is fixedly connected to the side wall of the main oil tank, the side wall of the main oil tank is provided with a mounting hole, the mounting seat is provided with a positioning hole, the positioning hole and the mounting hole are coaxially arranged, the first end of the valve stem is connected to the rotating member, the second end of the valve stem passes through the positioning hole and extends to the outside of the main oil tank, and the handle is installed on the second end of the valve stem.

3. The flap type cut-off valve according to claim 2, characterized in that: It also includes a second spring, which is arranged between the handle and the mounting seat. When the handle rotates along the first direction, pressure is applied to the second spring to cause the second spring to undergo elastic deformation.

4. The flap type cut-off valve according to claim 3, characterized in that: It also includes an annular positioning member, the annular positioning member is fixedly connected to the mounting seat, and the annular positioning member and the positioning hole are coaxially arranged; The annular positioning member is provided with a slot, and the handle is provided with a claw. When the handle rotates, the claw and the slot are engaged with each other to limit the rotation of the handle in a second direction. The first direction and the second direction are opposite.

5. The flap type cut-off valve according to claim 4, characterized in that: The clamping claw is rotatably connected to the handle, and a third spring is arranged between the clamping claw and the handle. The third spring is used to apply an elastic force to the clamping claw so that the clamping claw is pressed tightly into the clamping slot.

6. The flap type cut-off valve according to claim 4, characterized in that: The claw is provided with a plurality of protrusions, the clamping groove is a sawtooth groove, the sawtooth groove includes a plurality of tooth grooves sequentially distributed along the circumference of the annular positioning member, the number of the tooth grooves is greater than the number of the protrusions, and the protrusions and the tooth grooves are engaged with each other; A limit block is provided on the annular positioning member, and the limit block cooperates with the claw along the circumference of the annular positioning member to limit excessive rotation of the handle. A guiding inclined surface is provided on the tooth groove to facilitate the rotation of the claw along the first direction, and the guiding inclined surface faces the side away from the limit block.

7. The flap type cut-off valve according to claim 1, characterized in that: The rotating member is a cam, the axis of the cam is provided with an axial hole, one end of the valve stem is inserted into and fixed in the axial hole, and the protruding portion of the cam is connected to the traction rope; The cover plate is arranged along the height direction of the partition plate, and the end of the cover plate connected to the base is higher than the end connected to the traction rope, and the protrusion of the cam faces the through hole.

8. The flap type cut-off valve according to claim 1, characterized in that: A sealing ring is provided between the base and the cover plate, and the sealing ring is nested in the outer periphery of the perforation. The first spring applies an elastic force to the cover plate so that the cover plate presses the sealing ring against the base to achieve sealing.

9. A drone, characterized in that: A fuel system and a flap-type cut-off valve according to any one of claims 1 to 8, wherein the fuel system comprises a main fuel tank and a subsidiary fuel tank, a partition is provided between the main fuel tank and the subsidiary fuel tank, a through hole is provided on the partition for connecting the main fuel tank and the subsidiary fuel tank, and the flap-type cut-off valve is provided on the partition and used to seal the through hole; The fuel system of the UAV also includes a center of gravity detection device and a processor. The center of gravity detection device is used to detect the center of gravity position data of the UAV. The center of gravity detection device is electrically connected to the processor. The processor is used to determine the degree of center of gravity deviation of the UAV based on the center of gravity position data.

10. A method for controlling the oil flow rate of an unmanned aerial vehicle, characterized in that: The method comprises the drone as claimed in claim 9, wherein the drone comprises a fuel system and a flap-type shut-off valve, the fuel system comprises a main fuel tank and a secondary fuel tank, the flap-type shut-off valve comprises a handle, a valve stem, a traction rope, a cover plate and a base, and the method comprises: The valve stem is controlled to rotate in a first direction by the handle, and when the valve stem rotates, the cover plate is driven by the traction rope to move toward a side away from the base, so that the main oil tank and the auxiliary oil tank are connected through the through hole on the base; Detecting first center of gravity position data of the drone at the first time by a center of gravity detection device; Detecting second center of gravity position data of the drone at a second time by a center of gravity detection device; Calculating, by the processor, a difference between the first center-of-gravity position data and the second center-of-gravity position data; The processor compares the difference with a set threshold value, and when the difference is greater than the set threshold value, controls the handle to rotate in a second direction, wherein the first direction is opposite to the second direction.

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