Unmanned hot-air balloon

Abstract

The utility model discloses an unmanned hot air balloon, which relates to the technical field of aircrafts, and comprises a balloon bag, a bracket and a burner, a hot air cavity is formed in the balloon bag, and the bottom of the balloon bag is respectively provided with an air inlet communicated with the hot air cavity. The unmanned hot air balloon further comprises a bracket and a burner, the bracket is connected with the balloon bag and arranged close to the air inlet, and the burner extends into the hot air cavity through the air inlet. The unmanned hot-air balloon further comprises a first transverse rod, a first propeller and a second propeller, the first transverse rod stretches across the bracket, the first propeller and the second propeller are rotationally connected to the two ends of the first transverse rod respectively, and the flying direction of the unmanned hot-air balloon can be adjusted when the first propeller and / or the second propeller rotate. And the combustor can heat the gas in the hot gas cavity during combustion so as to drive the balloon bag to fly. The first propeller and the second propeller can adjust the flight and direction of the balloon bag during working, so that the unmanned hot-air balloon achieves the basic functions of autonomous flight, self-return flight, spot hovering and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of aircrafts, and particularly relates to an unmanned hot air balloon. Background Art

[0002] A hot air balloon is a lighter-than-air aircraft with an upper part being a large spherical shape and a lower part being a gondola. The balloon heats the air inside it, so that it has a lower density relative to the cold air outside the hot air balloon, and serves as buoyancy to displace the entire hot air balloon. The bottom of the hot air balloon is equipped with a gondola, which is usually used to carry the heat source and other loads of the hot air balloon.

[0003] However, there are still defects in the prior art. For example, existing hot air balloons can only drift with the wind, basically have no maneuverability, cannot perform autonomous flight and hover in place, nor can they return by themselves. Therefore, it is necessary to develop an unmanned hot air balloon so that the unmanned hot air balloon can perform fixed-point patrol flight and return by itself. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above technical deficiencies, and provide an unmanned hot air balloon to solve the technical problems in the prior art that hot air balloons basically have no maneuverability, cannot perform autonomous flight and hover in place, nor can they return by themselves.

[0005] To achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides an unmanned hot air balloon, including:

[0007] A balloon envelope, which forms a hot air cavity, and an air inlet and an air outlet communicating with the hot air cavity are respectively arranged at the bottom and the top of the balloon envelope; and

[0008] The unmanned hot air balloon further includes a bracket and a burner. The bracket is connected to the balloon envelope and is arranged near the air inlet, and the burner extends into the hot air cavity through the air inlet;

[0009] The unmanned hot air balloon further includes a first cross bar, a first propulsion paddle and a second propulsion paddle. The first cross bar spans across the bracket, and the first propulsion paddle and the second propulsion paddle are respectively rotatably connected to both ends of the first cross bar. When the first propulsion paddle and / or the second propulsion paddle rotate, they can propel the unmanned hot air balloon to move and adjust the flight direction of the unmanned hot air balloon.

[0010] In some embodiments, an air outlet communicating with the hot air chamber is formed at the top of the balloon envelope. The unmanned hot air balloon further includes an air flow regulating assembly, which includes a regulating member and a control mechanism. The regulating member is movably connected to the balloon envelope and is disposed near the air outlet. The control mechanism is connected to the regulating member and is capable of driving the regulating member to open or close the air outlet.

[0011] In some embodiments, the regulating member includes a sealing plate and a torsion spring. The sealing plate is rotatably connected to the balloon envelope through the torsion spring. The control mechanism is connected to the sealing plate. When the control mechanism drives the sealing plate to rotate and open the air outlet, the sealing plate drives the torsion spring to accumulate elastic force. The torsion spring can release the elastic force to drive the sealing plate to close the air outlet when the control mechanism releases the sealing plate.

[0012] In some embodiments, the control mechanism includes a winch and a pull rope. The winch is disposed on the balloon envelope. One end of the pull rope is connected to the sealing plate, and the other end of the pull rope is connected to the winch. The winch can drive the pull rope to pull the sealing plate to rotate and open the air outlet when winding up the pull rope, and when the winch releases the pull rope, the torsion spring releases the elastic force to drive the sealing plate to close the air outlet.

[0013] In some embodiments, the bracket includes a connected bearing frame and a collar. The collar is connected to the balloon envelope around the circumference of the air inlet. The bearing frame is located outside the balloon envelope. A cross is disposed on the inner side of the collar, and the burner is disposed on the cross.

[0014] In some embodiments, the unmanned hot air balloon further includes a plurality of warp skeletons. The plurality of warp skeletons are evenly disposed around the circumference of the balloon envelope. One end of each warp skeleton extends to the air outlet, and the other end is connected to the collar.

[0015] In some embodiments, the unmanned hot air balloon further includes a second cross bar and two first optical devices. The second cross bar spans across the bracket. The two first optical devices are respectively disposed at both ends of the second cross bar. The first optical device can project onto the balloon envelope on the side facing the balloon envelope, and can emit light for illumination on the side facing away from the balloon envelope.

[0016] In some embodiments, a plurality of air guide holes are formed in the circumferential direction of the balloon envelope near the air inlet, and each air guide hole penetrates through the balloon envelope.

[0017] In some embodiments, the unmanned hot air balloon further includes a control component disposed on the bracket. The control component includes a controller, a power supply, a light sensor, and a sound sensor. The power supply is connected to the controller and is used to supply power to the controller. The light sensor and the sound sensor are both connected to the controller and are used to transmit the detected sound signals and image signals to the ground terminal through the controller.

[0018] In some embodiments, the balloon envelope is conical, and the end with a smaller area of the balloon envelope is connected to the bracket.

[0019] Compared with the prior art, the burner included in the unmanned hot air balloon provided by the present invention extends into the hot air chamber of the balloon envelope through the air inlet. When the burner burns, it can heat the gas in the hot air chamber to drive the balloon envelope to fly. The first crossbar spans across the bracket, and the first propulsion paddle and the second propulsion paddle are respectively located at both ends of the first crossbar. When the first propulsion paddle and the second propulsion paddle are working, they can push the balloon envelope to move and adjust the flight direction of the balloon envelope, so that the unmanned hot air balloon can realize basic functions such as autonomous flight, self-return, and fixed-point hovering. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the unmanned hot air balloon provided by an embodiment of the present invention;

[0021] Figure 2 is an internal schematic diagram of the unmanned hot air balloon provided by an embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of another embodiment of the air flow regulating component provided by an embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of the connection of the first crossbar, the second crossbar, and the collar provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] In order to solve the technical problems in the prior art that hot air balloons basically have no maneuverability, cannot perform fixed-point patrol flights, and cannot return by themselves, the present invention provides an unmanned hot air balloon that can realize the control of the hot air balloon, perform fixed-point patrol flights, and return by itself.

[0026] Please refer to Figure 1 , Figure 1FIG. 0 is a schematic structural diagram of an unmanned hot air balloon 100 in an embodiment of the present utility model. The unmanned hot air balloon 100 can fly without carrying people and detect a target area. The unmanned hot air balloon 100 includes a balloon envelope 1 and an air flow adjustment assembly 2. The balloon envelope 1 encloses a hot air chamber 11. An air outlet 12 and an air inlet 13 are respectively formed at the top and bottom of the balloon envelope 1. The air inlet 13 and the air outlet 12 are both communicated with the hot air chamber 11. When the hot air chamber 11 is supplied with fire, it can drive external air to enter the hot air chamber 11 from the air inlet 13 and then discharge from the hot air chamber 11 through the air outlet 12. The air flow adjustment assembly 2 includes an adjustment member 21 and a control mechanism 22. The adjustment member 21 is movably connected to the balloon envelope 1. The control mechanism 22 is connected to the adjustment member 21 and can drive the adjustment member 21 to open or close the air outlet 12. When the adjustment member 21 opens the air outlet 12, the hot air flow in the hot air chamber 11 can be discharged from the air outlet 12, quickly reducing the inventory of the hot air flow in the hot air chamber 11, and the unmanned hot air balloon 100 can quickly descend. When the adjustment member 21 closes the air outlet 12, as the hot air flow in the hot air chamber 11 gradually increases, the unmanned hot air balloon 100 can quickly rise. Therefore, the height of the unmanned hot air balloon 100 can be quickly controlled by manipulating the adjustment member 21 to open or close the air outlet 12, so as to realize the longitudinal rapid maneuverability of the unmanned hot air balloon. In this embodiment, the adjustment member 21 is movably connected to the balloon envelope 1, which can be understood as the adjustment member 21 is rotationally connected or slidably connected to the balloon envelope 1.

[0027] In one embodiment, please refer to Figure 2 , the adjustment member 21 includes a sealing plate 211 and a first torsion spring ( Figure 2 not shown). The sealing plate 211 is rotationally connected to the balloon envelope 1 through the first torsion spring. The control mechanism 22 is connected to the sealing plate 211. When the control mechanism 22 drives the sealing plate 211 to rotate and open the air outlet 12, the sealing plate 211 drives the first torsion spring to accumulate elastic force. The first torsion spring can release the elastic force to drive the sealing plate 211 to close the air outlet 12 when the control mechanism 22 releases the sealing plate 211. In this embodiment, the sealing plate 211 can be funnel-shaped so that the sealing plate 211 can completely fit the balloon envelope 1 when closing the air outlet 12, improving the sealing performance of the air outlet 12. The control mechanism 22 can also control the ventilation area of the sealing plate 211 to open the air outlet 12, so as to accurately control the descending speed of the unmanned hot air balloon 100 or maintain it at the current height, which is convenient to operate. In other embodiments, the sealing plate 211 can also be connected to the balloon envelope 1 by a sliding connection method. For example, a vertical slide rail is provided at a position of the balloon envelope 1 close to the air outlet 12, a return spring is arranged on the slide rail, the sealing plate 211 is slidably connected to the slide rail, the control mechanism 22 can pull the sealing plate 211 down to open the air outlet 12, and the sealing plate 211 presses down the return spring to accumulate elastic force; when the control mechanism 22 is released, the return spring releases the elastic force to drive the sealing plate 211 to close the air outlet 12 again.

[0028] In one embodiment, please refer to Figure 2 , the control mechanism 22 includes a first wire winder 221 and a first pulling rope 222. The first wire winder 221 is arranged on the balloon 1. It can be understood that the first wire winder 221 is directly connected to the balloon 1 or indirectly connected to the balloon 1 through other components. One end of the first pulling rope 222 is connected to the sealing plate 211, and the other end of the first pulling rope 222 is connected to the first wire winder 221. When the first wire winder 221 winds up the first pulling rope 222, it can drive the first pulling rope 222 to pull the sealing plate 211 to rotate and open the air outlet 12. The rotation of the sealing plate 211 causes the first torsion spring to accumulate elastic force. When the first wire winder 221 releases the first pulling rope 222, the first torsion spring releases the elastic force to drive the sealing plate 211 to close the air outlet 12. In addition, the length of the first pulling rope 222 can be pulled by the first wire winder 221 to control the sealing plate 211 to be in a semi-open state, so that the unmanned hot air balloon 100 maintains the current height state.

[0029] In a more optimal embodiment, please refer to Figure 3 , the adjusting member 21 includes a sealing plate 211, a first torsion spring 212, a second torsion spring 213 and a ventilation plate 214. The control mechanism 22 includes a first wire winder 221, a second wire winder 223, a first pulling rope 222 and a second pulling rope 224. The sealing plate 211 is rotatably connected to the ventilation plate 214 through the first torsion spring 212. The ventilation plate 214 is rotatably connected to the balloon 1 through the second torsion spring 213. The two ends of the first pulling rope 222 are respectively connected to the sealing plate 211 and the first wire winder 221. The two ends of the second pulling rope 224 are respectively connected to the ventilation plate 214 and the second wire winder 223. When the first wire winder 221 tightens the first pulling rope 222, it can drive the sealing plate 211 to rotate away from the ventilation plate 214 through the first pulling rope 222. When the second wire winder 223 tightens the second pulling rope 224, it can drive the ventilation plate 214 to rotate through the second pulling rope 224. The ventilation plate 214 simultaneously drives the sealing plate 211 to rotate, which is equivalent to driving the ventilation plate 214 and the sealing plate 211 to rotate simultaneously. The ventilation plate 214 is provided with a plurality of ventilation holes 215 along its length direction, and each ventilation hole 215 communicates with the air outlet 12.

[0030] This embodiment has two ventilation modes. When the air outlet 12 needs to be semi-ventilated, only the first wire winder 221 needs to be controlled to tighten the first pulling rope 222 to drive the sealing plate 211 to rotate away from the ventilation plate 214. At this time, the hot air chamber 11 of the balloon 1 communicates with the air outlet 12 through the ventilation holes 215, which can drive the unmanned hot air balloon 100 to hover in the air.

[0031] When the air outlet 12 needs to be fully ventilated, only the second wire winder 223 needs to be manipulated to tighten the second pulling rope 224 to drive the ventilation plate 214 to rotate. At this time, the ventilation plate 214 drives the sealing plate 211 to rotate simultaneously, completely opening the air outlet 12. The hot air cavity 11 is completely communicated with the air outlet 12, and the hot air flow can flow out through the air outlet 12 faster. The unmanned hot air balloon 100 is in a descending state.

[0032] In one embodiment, please refer to Figure 2 , the unmanned hot air balloon 100 further includes a bracket 3, a gas cylinder 4 and a burner 5. The bracket 3 is connected to the balloon envelope 1 and is disposed near the air inlet 13. The gas cylinder 4 is disposed on the bracket 3. The burner 5 extends into the hot air cavity 11 through the air inlet 13. The burner 5 is built into the hot air cavity 11, which can reduce the heat loss generated during the combustion of the burner 5, improve the thermal efficiency, and at the same time can also avoid the influence of the environmental side wind on the combustion flame, enhancing the stability and safety of the hot air balloon flight. The gas cylinder 4 is connected to the burner 5 and is used to drive the burner 5 to burn. The gas cylinder 4 stores a certain amount of fuel, which is used to provide energy for the combustion of the burner 5. In this embodiment, the bracket 3 mainly serves to carry the gas cylinder 4 and the burner 5. The gas cylinder 4 stores fuel, and the gas cylinder 4 can ignite the burner 5 to drive the burner 5 to burn in the hot air cavity 11, providing a power source for the flight of the unmanned hot air balloon 100.

[0033] In one embodiment, please refer to Figure 2 , the bracket 3 includes a connected bearing frame 31 and a collar 32. The collar 32 is connected to the balloon envelope 1 around the circumference of the air inlet 13. The collar 32 is made of a metal rigid material. The rigid collar 32 can prevent the flexible air inlet 13 from being deformed by force, so that the air inlet 13 of the balloon envelope 1 can always remain open. The bearing frame 31 is located outside the balloon envelope 1. The gas cylinder 4 is disposed on the bearing frame 31. A cross 33 is provided inside the collar 32, and the burner 5 is disposed on the cross 33, so that the burner 5 can spray fire toward the hot air cavity 11 during combustion.

[0034] In one embodiment, please refer to Figure 2 , the unmanned hot air balloon 100 further includes a plurality of warp skeletons 6. The plurality of warp skeletons 6 are uniformly disposed around the circumference of the balloon envelope 1. One end of each warp skeleton 6 extends to the air outlet 12, and the other end is connected to the collar 32. In this embodiment, the warp skeletons 6 are used to evenly support the balloon envelope 1 so that the balloon envelope 1 can maintain a conical lantern shape. The warp skeletons 6 can also enhance the toughness of the unmanned hot air balloon 100.

[0035] In one embodiment, please refer to Figure 2, the unmanned hot air balloon 100 further includes a first crossbar 71, a first propulsion paddle 72 and a second propulsion paddle 73. The first crossbar 71 spans across the bracket 3. The first propulsion paddle 72 and the second propulsion paddle 73 are respectively rotatably connected to both ends of the first crossbar 71. When the first propulsion paddle 72 and / or the second propulsion paddle 73 rotate, they can adjust the flight direction of the unmanned hot air balloon 100. In this embodiment, the unmanned hot air balloon 100 further includes a first motor 74 and a second motor 75 provided at both ends of the first crossbar 71. The first motor 74 is connected to the first propulsion paddle 72 and is used to drive the first propulsion paddle 72 to rotate; the second motor 75 is connected to the second propulsion paddle 73 and is used to drive the second propulsion paddle 73 to rotate. When the first propulsion paddle 72 or the second propulsion paddle 73 rotates, it can apply a certain force to the first crossbar 71 through the airflow. Thus, the first crossbar 71 drives the entire unmanned hot air balloon 100 to turn and adjust the direction of the unmanned hot air balloon 100. Therefore, the flight and direction of the unmanned hot air balloon 100 can be controlled by controlling the first motor 74 and / or the second motor 75, so that the unmanned hot air balloon can hover at a fixed point, fly autonomously and return by itself. Figure 1 In the illustrated embodiment, the first propulsion paddle 72 and the second propulsion paddle 73 are located on the same side of the first crossbar 71. In other embodiments, the first propulsion paddle 72 and the second propulsion paddle 73 can also be provided on both sides of the first crossbar 71.

[0036] Furthermore, second optical devices 76 are provided at both ends of the first crossbar 71. The second optical devices 76 are cylindrical. The end facing the balloon envelope 1 can project a projection 77 onto the balloon envelope 1, which can be understood as the function of a projector. For example, when the unmanned hot air balloon 100 loses contact, it can project SOS or other distress messages towards the balloon envelope 1 to attract attention. The other end of the second optical device 76 is a lighting lamp, which can emit light to provide illumination. For example, a camera can be installed on the bracket 3. The camera is connected to a ground terminal and transmits the captured images to the ground terminal. The lighting lamp can provide illumination for the camera to make the captured images clearer, and can also provide illumination and direction guidance for the rescue site. A communication device can also be installed on the bracket 3. The communication device can serve as an air temporary base station or a relay station to ensure smooth rescue communication and mobile phone signals.

[0037] In one of the embodiments, please refer to Figure 4The unmanned hot air balloon 100 further includes a second crossbar 81 and two first optical devices 82. The second crossbar 81 spans the bracket 3. The two first optical devices 82 are respectively arranged at the two ends of the second crossbar 81. The first optical device 82 can project the balloon capsule 1 on the side facing the balloon capsule 1, and the first optical device 82 can emit light on the side facing away from the balloon capsule 1. In this embodiment, the first optical device 82 and the second optical device 76 described above have the same structure and function, and no further description is given here. The second crossbar 81 is arranged vertically and crosswise with the first crossbar 71. The addition of two first optical devices 82 is to expand the projection range and the illumination range, so that the projection and illumination have no dead angles and can be displayed and illuminated in all directions. The balloon capsule 1 is conical, the end of the balloon capsule 1 with a smaller area is connected to the bracket 3, and the end of the balloon capsule 1 with a larger area faces upward. The balloon capsule 1 is like an inverted flask or a garlic head. The longitudinal curvature of the downward conical surface of the balloon capsule 1 is small, and the projection distortion of the balloon capsule 1 by the first optical device 82 and the second optical device 76 is small.

[0038] In one embodiment, see Figure 2 The balloon bag 1 is provided with a plurality of air guide holes 14 along its circumference near the air inlet 13. The upper part of the balloon bag 1 with a large diameter is mainly used to contain the hot air to generate floating lift, and the lower part with a small diameter neck part plays a role in guiding the intake airflow required for combustion and preventing the side wind from interfering with the normal combustion of the flame of the lift burner 5. The air guide holes 14 play a role in secondary air supply for combustion, as well as pressure balance and drainage of the balloon bag 1, to prevent the dangers of high-pressure recoil flashback caused by deflagration.

[0039] In one embodiment, see Figure 1 The unmanned hot air balloon 100 further includes a control assembly 9 disposed on the bracket 3, the control assembly 9 includes a controller 91, a power supply 92, an image detector 93 and a sound detector 94, the power supply 92 is connected to the controller 91 and used to power the controller 91. The controller 91 is wirelessly connected to the ground terminal, the image detector 93 and the sound detector 94 are both connected to the controller 91, and are used to transmit the detected sound signals and image signals to the ground terminal through the controller 91, so that the ground staff can obtain the current flight status of the unmanned hot air balloon 100 through the ground terminal, so as to remotely control the flight of the unmanned hot air balloon 100.

[0040] Furthermore, the controller 91 is also wirelessly connected to other working components in the present utility model, such as the gas cylinder 4, the first motor 74, the second motor 75, the first optical device 82, and the second optical device 76. These working components are all wirelessly connected to the ground terminal through the controller 91. The staff can control the operation or non-operation of these working components by operating the ground terminal, so as to control the flight direction, flight altitude, projection, lighting, etc. of the unmanned hot air balloon 100, so that the unmanned hot air balloon 100 can successfully complete the flight mission.

[0041] For a better understanding of the present utility model, the following will be combined with Figures 1 to 3 the technical solutions of the present utility model will be described in detail:

[0042] The first wire winder 221 provided by the present utility model can control the opening or closing of the sealing plate 211 when winding or unwinding the first pulling rope 222, so as to change the internal hot air storage amount and pressure of the balloon bladder 1, and drive the unmanned hot air balloon 100 to quickly lift and lower. By controlling the operation of the first motor 74 and the second motor 75, flight power is provided for the unmanned hot air balloon 100, and the flight direction of the unmanned hot air balloon 100 is adjusted through the propulsion difference between the two. Then, the combustion part 5 is ignited by the gas cylinder 4 to heat the gas inside the balloon bladder 1, providing a lift source for the unmanned hot air balloon 100 to hover in flight, so that the unmanned hot air balloon 100 can achieve hovering flight, fixed-point suspension, and self-return. The current image and sound information are obtained through the image detector 93 and the sound detector 94 to know the flight status of the unmanned hot air balloon 100. It can be seen that the flight function of the unmanned hot air balloon 100 of the present utility model is perfect, and its quick lift and lower and turning can be conveniently controlled, which is beneficial to successfully completing the flight and multimedia playback tasks.

[0043] The above specific implementation manners of the present utility model do not constitute a limitation on the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. An unmanned hot air balloon, characterized in that: include: A balloon bag, wherein the balloon bag is formed with a hot air cavity, and the bottom and top of the balloon bag are respectively provided with an air inlet and an air outlet connected to the hot air cavity; and The unmanned hot air balloon further comprises a bracket and a burner, wherein the bracket is connected to the balloon bag and is arranged close to the air inlet, and the burner extends into the hot air cavity through the air inlet; The unmanned hot air balloon also includes a first cross bar, a first propulsion propeller and a second propulsion propeller. The first cross bar spans the bracket, and the first propulsion propeller and the second propulsion propeller are respectively rotatably connected to the two ends of the first cross bar. The first propulsion propeller and / or the second propulsion propeller can propel the unmanned hot air balloon and adjust the flight direction of the unmanned hot air balloon when rotating.

2. The unmanned hot air balloon according to claim 1, characterized in that: The unmanned hot air balloon also includes an airflow regulating component, which includes an adjusting part and a control mechanism. The adjusting part is movably connected to the balloon bag and is arranged close to the air outlet. The control mechanism is connected to the adjusting part and can drive the adjusting part to open or close the air outlet.

3. The unmanned hot air balloon according to claim 2, characterized in that: The adjusting member includes a sealing plate and a torsion spring, the sealing plate is rotatably connected to the balloon bag via the torsion spring, the control mechanism is connected to the sealing plate, when the control mechanism drives the sealing plate to rotate to open the air outlet, the sealing plate drives the torsion spring to accumulate elastic force, and when the control mechanism releases the sealing plate, the torsion spring can release the elastic force to drive the sealing plate to close the air outlet.

4. The unmanned hot air balloon according to claim 3, characterized in that: The control mechanism includes a wire reel and a pull rope, the wire reel is arranged on the balloon bag, one end of the pull rope is connected to the sealing plate, and the other end of the pull rope is connected to the wire reel. The wire reel can drive the pull rope to pull the sealing plate to rotate and open the air outlet when the pull rope is reeled, and can release the elastic force of the torsion spring to drive the sealing plate to close the air outlet when the pull rope is released.

5. The unmanned hot air balloon according to claim 4, characterized in that: The bracket includes a connected support frame and a collar, the collar is connected to the balloon bag around the circumference of the air inlet, the support frame is located outside the balloon bag, a cross is arranged on the inner side of the collar, and the burner is arranged on the cross.

6. The unmanned hot air balloon according to claim 5, characterized in that: The unmanned hot air balloon also includes a plurality of warp skeletons, which are evenly arranged around the circumference of the balloon bag, and one end of each of the warp skeletons extends to the air outlet, and the other end is connected to the collar.

7. The unmanned hot air balloon according to claim 1, characterized in that: The unmanned hot air balloon also includes a second cross bar and two first optical devices. The second cross bar spans the bracket. The two first optical devices are respectively arranged at both ends of the second cross bar. The first optical device can project light onto the balloon capsule on the side facing the balloon capsule, and can emit light on the side facing away from the balloon capsule.

8. The unmanned hot air balloon according to claim 1, characterized in that: The balloon bag is provided with a plurality of air guide holes along its circumference at a position close to the air inlet, and each of the air guide holes penetrates the balloon bag.

9. The unmanned hot air balloon according to claim 1, characterized in that: The unmanned hot air balloon also includes a control component arranged on the bracket, and the control component includes a controller, a power supply, a light sensor and an acoustic sensor. The power supply is connected to the controller and is used to power the controller. The light sensor and the acoustic sensor are both connected to the controller and are used to transmit the detected sound signals and image signals to the ground terminal through the controller.

10. The unmanned hot air balloon according to claim 1, characterized in that: The balloon bag is conical, and the end of the balloon bag with a smaller area is connected to the bracket.

Images