Automatic positioning aircraft convenient to beat and play

Abstract

The invention relates to the field of machinery, in particular to an aircraft. An automatic positioning aircraft convenient to beat and play is characterized by comprising a shell, a control circuit is arranged in the shell, the control circuit comprises a signal input end and a signal output end, and the signal input end is connected with a distance sensor; the signal output end is connected with a motor which is linked with the propeller; the air bag is used for containing light gas; the shell is arranged below the air bag, the motor is fixed to the shell, the propeller is arranged below the shell and used for providing lift force, and the propeller is called a lifting propeller.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and in particular to aircraft. Background Art

[0002] Most of the existing remote control aircraft have the following problems:

[0003] 1. Remote control is generally difficult. For example, children under 10 years old are basically incapable of remote control operation of toy remote control airplanes. The outer packaging of toy remote control airplanes usually states that they are not suitable for children under 10 years old. In fact, it is difficult for adults without special training to smoothly control toy remote control airplanes. Although there are relatively simple-to-operate intelligent drones, they are difficult for children to use, and adults still have difficulty operating them, and the cost is relatively high.

[0004] 2. There is a certain degree of danger. Since the blades (propellers) of remote-controlled aircraft rotate at high speeds and have great power, they are also very damaging. In addition to the remote-controlled aircraft itself being damaged, there are also cases where the blades injure children, damage furniture and other items.

[0005] 3. Existing small aircraft still have the problem of short flight time. Generally, the flight time of a toy remote-controlled aircraft is less than 10 minutes. The flight time of a civilian drone is also generally less than 30 minutes.

[0006] 4. Existing aircrafts have relatively loud flying noise, which has a great impact on people inside, especially when used indoors.

[0007] 5. Existing aircraft with automatic hovering function are relatively expensive. Summary of the invention

[0008] The purpose of the present invention is to provide an automatic positioning aircraft that is convenient for playing with and playing with, so as to solve at least one of the above-mentioned technical problems.

[0009] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0010] An automatic positioning aircraft that is convenient for playing and playing, characterized in that it comprises a shell, in which a control circuit is arranged, the control circuit comprises a signal input end and a signal output end, and the signal input end is connected to a distance sensor;

[0011] The signal output end is connected to a motor, which is linked to the propeller;

[0012] Also included is a gas bag for containing a lightweight gas;

[0013] The shell is arranged below the airbag, the electric motor is fixed on the shell, and the propeller is arranged below the shell and is a propeller that provides lift, and is called a lifting propeller.

[0014] The airbag is filled with light gas, such as hydrogen or helium, so that the sum of the gravity of the inflatable airbag and the automatic positioning aircraft that is easy to play with is slightly greater than the buoyancy. When the lifting propeller rotates at a low speed or stops, the airbag descends or stops on the ground. When the relative speed of the lifting propeller is high, it provides upward thrust to allow the airbag to hover or ascend.

[0015] The airbag is adjusted so that after being filled with light gas, the overall gravity of the automatic positioning aircraft, which is convenient for flapping and playing, is slightly greater than the overall buoyancy. It is preferably adjusted to a state close to suspension.

[0016] A preferred solution of the control circuit is an active infrared proximity sensor circuit, and the distance sensor adopts an active infrared proximity sensor.

[0017] It has the advantages of simple structure, low energy consumption and low cost.

[0018] Another preferred solution of the control circuit is a microprocessor system composed of a microprocessor and peripheral circuits. The microprocessor is preferably a single-chip microcomputer.

[0019] It has the advantages of relatively simple structure, relatively low energy consumption, relatively low cost, etc. It also has the advantages of strong anti-interference ability and allows a longer sensing distance to be set.

[0020] The upper and lower positions mentioned in this patent refer to the upper and lower positions of the posture of the automatic positioning aircraft in flight, which is convenient for flapping and playing.

[0021] The lifting propeller adopts a propeller in which at least one edge of the fin is made of a flexible material structure, which is called a flexible propeller.

[0022] The flexible propeller may have at least one edge of the fin made of flexible material, or the entire fin may be made of flexible material. This can reduce noise, prevent injuries to fingers, and prevent injuries to objects. The flexible material can be relatively hard relative to the hardness of common propellers of flying toy airplanes.

[0023] The flexible propeller must first meet the functional requirements of the propeller and be able to obtain thrust by moving the air. In addition, the flexibility mentioned here means that it will deform when it touches the fingers during rotation to avoid causing damage to the fingers. When the fingers leave, it will restore its shape and function.

[0024] In traditional aircraft, propellers are made of hard materials in order to generate stronger thrust. However, the present invention creatively adopts a technical solution that goes against common knowledge and achieves unexpected technical effects.

[0025] First, the present invention uses the buoyancy of the airbag as the main source of power to overcome gravity, and the lift force provided by the propeller is not large. Therefore, the flexible propeller can provide enough lift force to meet the flight requirements, while the traditional aircraft cannot. In addition, the flexible propeller has a reduced thrust, so the maneuverability should be reduced in theory. For example, in theory, the lifting speed, left and right turning speed, and forward and backward speed will all be reduced. In fact, experiments show that due to the presence of the airbag. Maneuverability is mainly affected by air resistance, rather than the inertia of traditional aircraft. Experiments show that the influence of this air resistance is nonlinear. During the movement, the force is stronger in the initial change stage. And the greater the thrust, the stronger the resistance. In other words, the difference in thrust between the flexible propeller and the hard propeller does not cause much difference in maneuverability, and does not constitute a substantial impact on the present invention. The flexible propeller does not hurt the fingers, so it allows the user to interact with the aircraft. For example, the user can chase and grab the aircraft, move the aircraft by hand, and pat the aircraft. These are all difficult to accomplish with traditional aircraft. So it has unexpected user experience and technical effects.

[0026] Experiments show that flexible propellers also have the beneficial effect of reducing noise.

[0027] In other words, the present invention overcomes technical prejudice and adopts a flexible propeller, which allows users to safely interact with the aircraft while ensuring flight performance. It also reduces noise, so that users are not affected by noise when they approach or touch the aircraft at close range. It enables the aircraft in operation to have good conditions for close interaction with users, and provides a good user experience that other traditional aircraft do not have. It has achieved unexpected technical effects. The technical effects are more prominent when flying indoors.

[0028] At least one propeller includes a shaft support and a flexible plastic fin, and is a flexible propeller; the shaft support is located in the middle of the propeller and is provided with a motor shaft plug-in interface; the flexible plastic fin is connected to the shaft support; the hardness of the shaft support is greater than that of the flexible plastic fin, and is fixed to the motor shaft through the shaft plug-in interface.

[0029] The shaft support with higher hardness is used as an intermediate body for the transmission connection between the motor shaft and the flexible plastic fin, which avoids the risk of slipping off the motor shaft due to the flexible plastic being too soft, and provides support for the stability of the overall shape of the propeller to ensure performance.

[0030] At least one propeller is a flexible propeller; the flexible propeller includes an integrated propeller made of flexible plastic and a hard shaft bushing; the integrated propeller includes flexible plastic fins and a shaft hole located in the middle; the hard shaft bushing is embedded in the shaft hole and fixed; the shaft bushing is provided with a transmission shaft socket, which is directly or indirectly connected to the motor shaft through the transmission shaft socket.

[0031] It can meet most of the technical performances of the shaft support, but has a simpler structure and lower cost.

[0032] Flexible plastic is softer than traditional aircraft propellers. It will not hurt your fingers during operation.

[0033] The maximum width of the fin of the lifting propeller is smaller than the length of the fin and larger than one quarter of the length of the fin, and at least three fins are provided.

[0034] In order to ensure sufficient thrust, traditional aircraft usually reduce the fin width and increase the propeller speed. However, the present invention significantly increases the fin width. By increasing the thrust at low speed and reducing the speed, the required propulsion effect is achieved. The pain of hand touch is reduced and the noise is reduced. It overcomes technical prejudice and has unexpected technical effects.

[0035] When the lifting propeller is rotating, at least one-third of the working surface of the fin has an angle greater than 20 degrees and less than 45 degrees with the rotating surface. The working surface refers to the surface that provides effective thrust in the working state.

[0036] The propeller fins of traditional aircraft (such as rotorcraft) that use propellers to provide lift generally have an angle between the fin and the rotating surface within 15 degrees, preferably within 10 degrees, to reduce resistance. This allows the propeller to achieve a higher speed, which is beneficial to the power output of the motor and produces a larger and more stable thrust.

[0037] The present invention overcomes technical prejudice and adopts fins with an angle greater than 20 degrees. Since the present invention uses air bags to provide buoyancy, the stability of the flight is already basically guaranteed by the air bags. For the application of the present invention, it does not, and is not suitable for, flights with short-term rapid turns or sudden changes in speed, and does not require rapid thrust output and large thrust output. Therefore, for the application of the present invention, the use of fins with an angle greater than 20 degrees and less than 45 degrees has basically no effect on the flight performance. In addition, the present invention is a special structure with a shield above the propeller, and the use of the above-mentioned angle is conducive to smooth air intake above.

[0038] When the fins with an angle greater than 20 degrees are selected, the resistance increases when the propeller rotates at a low speed, so the propeller is in a relatively low speed state during normal operation, and the output thrust is relatively large at this time. Due to the low speed, the noise is small during normal operation, and the pain is less when the fingers touch it, or even no pain, which has unexpected technical effects. It is also conducive to the return of airflow above the lifting propeller.

[0039] Experiments show that when the angle is greater than 45 degrees, the air resistance is too large, which will keep the propeller in a low speed and high torque state for a long time, resulting in high energy consumption, and the motor is prone to overload and overheating, and the power output will be significantly reduced. Therefore, it is selected to be less than 45 degrees.

[0040] The rotation surface can be determined in the following way. Determine a point on the fin, and the fin rotates around the axis once. The surface where the circle drawn by the point lies is the rotation surface. This is one way to determine the rotation surface. Of course, there are other ways.

[0041] If the working surface of the fin is flat, the angle between the plane where the fin is located and the rotating plane is greater than 20 degrees and less than 45 degrees.

[0042] If the working surface of the fin is a curved surface, the angle between the plane where at least one-third of the working surface of the fin is located and the rotation plane is greater than 20 degrees and less than 45 degrees.

[0043] The area of ​​the plane in which at least one third of the portion lies can be obtained by integration.

[0044] Because the flexible structure is adopted, the fin angle may not meet the limit when not working or working at a low speed. As long as the fin angle meets the limit during normal operation, it meets the limit requirements of the present invention.

[0045] In the stationary state and at least one working state of the flexible propeller, the angle between at least one of the four areas of the working surface of the fin and the rotating surface varies by more than 3 degrees. The working surface refers to the surface of the propeller that generates thrust to the air when it is in the working state, or in other words, the surface that plays a role in generating propulsion when it is in the working state.

[0046] The above technical requirements define the degree of flexibility, which can be an increase of more than three degrees or a decrease of more than three degrees. A propeller that meets this requirement has the advantages of low noise, low touch pain, or even no pain. Moreover, due to its flexibility, it can adjust the angle automatically due to different air resistance, so it can adjust the speed automatically and automatically cooperate with the power output of the motor.

[0047] A fixing portion for non-detachably fixing and connecting with the bottom of the airbag is arranged on the top of the shell.

[0048] The fixing part and the lower part of the airbag are fixed by gluing, or by at least one of ultrasonic welding and thermal welding.

[0049] Non-detachable fixed connections will cause damage to the structure if forcibly removed.

[0050] The airbag is a device that is easily damaged, while the housing and the electronic system inside it are not easily damaged. In traditional designs, two devices with significantly different service lives are often designed into a detachable structure for easy reuse.

[0051] However, this patent adopts a non-detachable mechanism to give up the feature of reuse in exchange for a strong structure and reduced weight.

[0052] Above the fixed part, an outer contour structure without sharp corners is adopted, and the surface above the fixed part is allowed to have an outer contour structure with a circular outer contour or an outer contour structure with a polygonal outer contour with rounded corners.

[0053] This prevents the sharp corners from piercing the airbag when the user hits it. In addition, because the edge of the shell is adhered to the airbag, this design also avoids excessive tearing stress, protecting the airbag from multiple aspects.

[0054] The fixed part is located on the upper surface of the shell.

[0055] The fixed part is located on the surface above the shell, and the contact area between the surface and the airbag is not less than two square centimeters.

[0056] It is convenient to provide a sufficiently large fixing area.

[0057] More preferably, the fixing portion is a frame located above the shell and having a hollow middle portion.

[0058] The frame structure reduces the fixing area but also reduces the weight, which is especially important for flight equipment using lightweight gas.

[0059] The coverage area drawn by the frame is not less than two square centimeters.

[0060] For example, the fixed part is a frame with a hollow center. The surface area of ​​the frame may be small, but the coverage area drawn by the frame can be large, preferably greater than two square centimeters, to ensure balanced force, optimize mechanical distribution, and ensure overall firmness.

[0061] When setting the steering function, because the airbag is flexible, a relatively large contact area is set at the fixed part, or a relatively large area is framed, so that when performing steering flight, the torque at the connection is small, thereby avoiding obvious deformation, steering delay, and unstable and inaccurate steering. It also avoids the problem that after the steering thrust disappears, deformation rebounds, causing the steering angle to change again, causing steering shaking and increasing steering accuracy errors.

[0062] The control circuit includes a signal input terminal and a signal output terminal, and the signal input terminal is connected to a distance sensor;

[0063] When the distance sensor senses that the height is lower than the set sensing height, the control circuit controls the motor to drive the lifting propeller to provide lift;

[0064] When the distance sensor senses that the height is higher than the set sensing height, the power supply to the motor is stopped.

[0065] Set the sensing height to less than two meters.

[0066] The set sensing height mentioned here is not limited to an actual height, but the data information reflected by the distance sensor. Due to different external environments, there will be differences between the reflected height and the actual height.

[0067] The present invention realizes automatic positioning of the flight altitude through altitude feedback, reduces the difficulty of use for users, and users do not need to worry about altitude control. When the altitude is higher than the set sensing altitude, the technical solution adopted is not to reverse the lifting propeller a3 to accelerate the altitude adjustment, nor to reduce the propeller speed to make the flight altitude return smoothly, but to directly stop the power supply to the motor and stop the lifting propeller.

[0068] When the altitude is too high, the motor stops rotating, which is a technology not suitable for traditional aircraft design. It will cause the aircraft to fall rapidly and lose balance.

[0069] This patent overcomes the prejudice of the prior art and adopts a solution of stopping the motor based on the aerodynamic characteristics of the airbag.

[0070] This design is based on the special structure and special application of the aircraft of the present invention. It is not necessary to use the traditional solution of low propeller speed to make the flight altitude return steadily, and directly shutting down the motor can also make the aircraft return to altitude steadily.

[0071] The aircraft of the present invention has an airbag structure, and the free fall speed is much slower than that of a traditional aircraft. Moreover, due to the air resistance of the airbag 2, the reverse rotation of the lifting propeller a3 cannot bring about a very obvious altitude acceleration adjustment.

[0072] The motor stopping solution also reduces the structural requirements for the flexible propeller compared to reducing the propeller speed and reversing.

[0073] The present invention directly adopts the solution of stopping the lifting propeller, which ensures the stability of the aircraft's descent height, avoids excessive energy consumption and cost increase, and does not affect the user experience. In particular, the present invention is applied to toy aircraft, which will not affect the experience. Therefore, it has an unexpected technical effect.

[0074] The sensing height is set below 2 meters, which is suitable for indoor flight and easy to interact with users, including physical interaction.

[0075] More preferably, the sensing height is set between 0.2 meters and 1.5 meters.

[0076] It is suitable for indoor flight and is easy to carry out interactive activities including physical interaction with children under ten years old.

[0077] The distance sensor includes an infrared light emitting diode and an infrared receiving sensor; the light emitting direction of the infrared light emitting diode is downward, and the light receiving side of the infrared receiving sensor is downward.

[0078] The aforementioned downward direction is not limited to vertically downward direction, and may be slightly inclined.

[0079] There is another solution. The distance sensor includes an ultrasonic generator and an ultrasonic receiving sensor; the sound emitting direction of the ultrasonic generator is downward; and the sound receiving direction of the ultrasonic receiver is downward.

[0080] Ultrasonic waves can facilitate greater height positioning feedback, and because ultrasonic height positioning is not affected by the color of the ground and is basically unaffected by the ground material, the aerial positioning height will not be affected by the different colors and materials of the user's floor.

[0081] The volume of the airbag is set to be greater than 3000 cubic centimeters and less than 35000 cubic centimeters.

[0082] Furthermore, the height of the airbag after inflation is preferably greater than 10 cm and less than 30 cm, and the length is preferably greater than 20 cm and less than 50 cm.

[0083] A block of liquid-absorbing material serving as a counterweight is arranged above the airbag.

[0084] The weight is adjusted by the amount of liquid (water, oil, alcohol, etc.) absorbed by the absorbent material block.

[0085] The method of use is: when the counterweight needs to be increased, liquid is injected into the liquid-absorbing material block; when the counterweight needs to be reduced, liquid is squeezed out from the liquid-absorbing material block.

[0086] Advantages of the above design:

[0087] First, the counterweight is placed above the airbag instead of on the shell, which reduces the complexity of the shell. In addition, the liquid used as the counterweight is remotely isolated from the circuit in the shell to protect the circuit.

[0088] Second, liquid is used as the counterweight instead of the traditional solid counterweight with a specific shape. The counterweight is easy to obtain, low cost, can be "infinitely" accurately adjusted, and the reduced weight can be discarded without storage.

[0089] Third, a liquid-absorbing material block is used instead of a simpler liquid container. The capillary phenomenon of the liquid-absorbing material block is utilized to evenly disperse the liquid used as a counterweight, keeping the center centered and stable, avoiding the problem of liquid shaking in the liquid container, and thus allowing the aircraft to fly smoothly after being hit.

[0090] It is further designed that a block of liquid absorbing material is bonded above the air bag.

[0091] Adopt simple structure to reduce weight and improve stability.

[0092] The thickness of the liquid-absorbing material block is less than 5 mm, and the coverage area is greater than 1 square centimeter and less than 9 square centimeters.

[0093] The utility model not only has the advantages of small volume, low center of gravity and difficulty in liquid spilling after being hit, but also the adjustable counterweight weight can meet the requirements of indoor balloons (air bags).

[0094] A further design is that a liquid-absorbing material block is fixed above the airbag, the liquid-absorbing material block is covered with a plastic film sleeve, and the plastic film sleeve is provided with an opening.

[0095] The setting of the plastic film sleeve has a very low weight increase, and can limit the evaporation of the liquid, and further prevent the liquid from scattering when tapping. The liquid can be injected or discharged through the opening, which is convenient to use. When reducing the weight operation, the hands can be kept clean during the liquid squeezing process.

[0096] Furthermore, the opening of the plastic film sleeve is an upwardly open opening.

[0097] The upward opening further prevents the liquid from being scattered when tapping, and facilitates the liquid to be injected from top to bottom. The opening is set to be open, which simplifies the structure and operation.

[0098] The liquid-absorbing material block is at least one of a sponge-structured material block, a cloth material block, a cotton material block, and a paper material block.

[0099] During storage and transportation after packaging:

[0100] It also includes a packaging box, in which the airbag is filled with helium but not full and is placed inside the packaging box, and the airbag is provided with an inflation port; it also includes an inflatable air bag filled with helium, and the inflatable air bag is provided with an external inflation port.

[0101] In traditional helium balloons, which need to be stored and transported, a flattened air ball (air bag) is used in the form of an air tank.

[0102] This patent overcomes the prejudice of the prior art and adopts the form of filling the airbag with helium but not fully filling it, and uses an inflatable air bag to carry out the sale that needs to be stored and transported. Under the premise of ensuring the demand for helium, the cost is greatly reduced.

[0103] The airbag is in a partially inflated state, with the inflation volume being greater than 50% of the saturated inflation volume and less than 85% of the saturated inflation volume.

[0104] For example, if the volume of the airbag is filled with gas and is 3000 cubic centimeters, only 1500 cubic centimeters to 2550 cubic centimeters of helium are injected.

[0105] In actual use, users will use airbags that are fully filled or nearly filled. However, the inventors noticed that the airbags that need to be stored and transported are prone to rupture when they are fully filled and lose helium due to gas diffusion. By assembling an airbag that is not fully inflated in the packaging box to reduce the internal air pressure, the flexibility of the airbag can be used to withstand strong impacts without rupture. Even if the packaging box is squeezed and deformed, the airbag can adapt to the deformation and avoid rupture.

[0106] By lowering the internal air pressure, the diffusion of helium is reduced, thus extending the shelf life.

[0107] The amount of helium in the inflated air bag is not less than the amount of helium required to fill the air bag.

[0108] For example, in the packaging box, the inflation volume of the airbag is 70%, and the amount of gas in the inflated airbag is greater than 30% of the inflation volume of the airbag.

[0109] The inflatable air bag is in a partially inflated state, and the inflation amount is greater than 50% of the saturated inflation amount and less than 85% of the saturated inflation amount.

[0110] For example, when an inflatable air bag is filled with gas, the volume is 3000 cubic centimeters, so only 1500 cubic centimeters to 2550 cubic centimeters of helium are introduced.

[0111] The inventors noticed that the inflatable air bag is easy to rupture when it is fully inflated and loses helium due to gas diffusion. By installing an inflatable air bag that is not fully inflated in the packaging box to reduce the internal air pressure, the flexibility of the inflatable air bag can be used to withstand strong impact without rupture. Even if the packaging box is squeezed and deformed, the inflatable air bag can adapt to the deformation and avoid rupture.

[0112] By lowering the internal air pressure, the diffusion of helium is reduced, thus extending the shelf life.

[0113] The packaging box can be a corrugated box, a plastic box, or other boxes that are easy to transport.

[0114] A foam stand is provided in the packaging box to protect the airbag.

[0115] Further systematization settings are:

[0116] The packaging box comprises at least one layer of corrugated paper, and an air bag is installed in the packaging box.

[0117] A housing is arranged below the airbag, wherein a control circuit is arranged in the housing, and the control circuit comprises a signal input terminal and a signal output terminal, wherein the signal input terminal is connected to a distance sensor; and the signal output terminal is connected to a motor, and the motor is linked to a propeller;

[0118] The motor is fixed on the housing, and the propeller is arranged below the housing and is a propeller that provides lift, and is called a lifting propeller;

[0119] A block of liquid-absorbing material serving as a counterweight is disposed above the airbag;

[0120] The airbag is filled with helium but not fully filled and placed in a packaging box. The airbag is provided with an inflation port;

[0121] It also includes an inflatable air bag filled with helium, and the inflatable air bag is provided with an external inflation port;

[0122] The amount of helium in the inflated air bag is not less than the amount of helium required to fill the air bag.

[0123] The above design is not only easy to transport and store, but also easy to fly, and the overall cost is greatly reduced compared to the traditional method of selling helium in gas tanks.

[0124] The shape of the airbag after inflation, such as a flying saucer, Superman, or a cloud.

[0125] It should be noted that the present invention is applicable to an aircraft. For an aircraft, a design that reduces weight while ensuring performance is progressive and has a positive effect; a design that finds an optimal balance point in terms of performance, weight, cost, equipment firmness, volume, ease of operation, and interactivity is also a progressive and positive design. The design points in the present invention almost all focus on these points. The progressiveness in this aspect is no longer emphasized one by one in the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0126] Figure 1 This is a schematic diagram of the overall structure of the automatic positioning aircraft of the present invention which is convenient for flapping and playing.

[0127] Figure 2 A schematic diagram of a shell structure.

[0128] Figure 3 It is a schematic diagram of the overall structure of another shell.

[0129] Figure 4 This is a schematic diagram of the overall disassembled structure of another shell.

[0130] Figure 5 A control circuit diagram. DETAILED DESCRIPTION

[0131] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0132] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0133] Reference Figure 1 , 2 , 3, 4, 5, an automatic positioning aircraft which is convenient for flapping and playing, comprises a shell 1, in which a control circuit 3 is arranged, the control circuit 3 comprises a signal input terminal and a signal output terminal, the signal input terminal is connected to a distance sensor; the signal output terminal is connected to an electric motor, the electric motor is linked to a propeller a; further comprising an air bag 2 for containing light gas; the shell 1 is arranged below the air bag 2, the electric motor is fixed on the shell 1, the propeller a is arranged below the shell 1, and is a propeller a for providing lift, and the propeller a is called a lifting propeller.

[0134] The airbag 2 is filled with light gas, such as hydrogen or helium, so that the sum of the gravity of the inflated airbag and the automatic positioning aircraft that is easy to play with is slightly greater than the buoyancy. When the lifting propeller rotates at a low speed or stops, the airbag 2 descends or stops on the ground. When the relative speed of the lifting propeller is high, an upward thrust is provided to allow the airbag 2 to hover or ascend.

[0135] The airbag 2 is adjusted to have a slightly greater overall gravity than the overall buoyancy of the automatic positioning aircraft after being filled with light gas, which is convenient for playing with.

[0136] The overall gravity is slightly greater than the overall buoyancy and is designed so that the difference between the overall gravity and the overall buoyancy is within one tenth of the overall gravity.

[0137] A preferred solution of the control circuit 3 is an active infrared proximity sensor circuit, and the distance sensor adopts an active infrared proximity sensor.

[0138] It has the advantages of simple structure, low energy consumption and low cost.

[0139] Another preferred solution of the control circuit 3 is a microprocessor system composed of a microprocessor and peripheral circuits. The microprocessor is preferably a single chip microcomputer.

[0140] It has the advantages of relatively simple structure, relatively low energy consumption, relatively low cost, etc. It also has the advantages of strong anti-interference ability and allows a longer sensing distance to be set.

[0141] The upper and lower positions mentioned in this patent refer to the upper and lower positions of the posture of the automatic positioning aircraft in flight, which is convenient for flapping and playing.

[0142] The lifting propeller adopts a propeller a in which at least one edge of the fin is made of a flexible material structure, which is called a flexible propeller a.

[0143] The flexible propeller a may have at least one edge of the fin made of a flexible material, or the entire fin may be made of a flexible material. This can reduce noise, prevent injuries to fingers, and prevent injuries to objects. The flexible material may be relatively hard relative to the hardness of a common flying toy airplane propeller a.

[0144] The flexible propeller a must first meet the functional conditions of the propeller a and be able to obtain thrust by moving the air. In addition, the flexibility mentioned here means that it will deform when it touches the finger during the rotation process to avoid causing damage to the finger. When the finger leaves, it will restore its shape and function.

[0145] In traditional aircraft, propeller a is made of hard material in order to generate stronger thrust. However, the present invention creatively adopts a technical solution contrary to common knowledge and achieves unexpected technical effects.

[0146] First, the present invention uses the buoyancy of the airbag 2 as the main source of force to overcome gravity, and the lift provided by the propeller a is not large. Therefore, the flexible propeller a can provide enough lift to meet the flight requirements, while the traditional aircraft cannot. In addition, the flexible propeller a has a reduced thrust, so the maneuverability should be reduced in theory. For example, in theory, the lifting speed, left and right turning speed, and forward and backward speed will all be reduced. In fact, experiments show that due to the presence of the airbag 2. Maneuverability is mainly affected by air resistance, rather than the inertia of traditional aircraft. Experiments show that the influence of this air resistance is nonlinear. During the movement, the force is stronger in the initial change stage. And the greater the thrust, the stronger the resistance. In other words, the difference in thrust between the flexible propeller a and the hard propeller a does not cause much difference in maneuverability, and does not constitute a substantial impact on the present invention. The flexible propeller a does not hurt the fingers, so it allows the user to interact with the aircraft. For example, the user can chase and grab the aircraft, can move the aircraft by hand, and can pat the aircraft. These are all difficult to accomplish with traditional aircraft. So it has unexpected user experience and technical effects.

[0147] Experiments show that flexible propeller a also has the beneficial effect of reducing noise.

[0148] That is to say, the present invention overcomes technical prejudice and adopts a flexible propeller a, which allows users to safely interact with the aircraft while ensuring flight performance. It also reduces noise, so that users are not affected by noise when they approach or contact the aircraft at close range. It enables the aircraft in operation to have good conditions for close interaction with users, and provides a good user experience that other traditional aircraft do not have. It has achieved unexpected technical effects. The technical effects are more prominent when flying indoors.

[0149] At least one propeller a includes a shaft support and a flexible plastic fin, and is a flexible propeller a; the shaft support is located in the middle of the propeller a, and is provided with a motor shaft plug-in interface; the flexible plastic fin is connected to the shaft support; the hardness of the shaft support is greater than the hardness of the flexible plastic fin, and is fixed to the motor shaft through the shaft plug-in interface.

[0150] The shaft support with higher hardness is used as an intermediate for the transmission connection between the motor shaft and the flexible plastic fin, which avoids the risk of slipping off the motor shaft due to the flexible plastic being too soft, and provides support for the stability of the overall shape of the propeller A to ensure performance.

[0151] At least one propeller a is a flexible propeller a; the flexible propeller a includes an integrated propeller a made of flexible plastic, and a hard shaft bushing; the integrated propeller a includes flexible plastic fins and a shaft hole located in the middle; the hard shaft bushing is embedded in the shaft hole and fixed; the shaft bushing is provided with a transmission shaft socket, which is directly or indirectly connected to the motor shaft through the transmission shaft socket.

[0152] It can meet most of the technical performances of the shaft support, but has a simpler structure and lower cost.

[0153] Flexible plastic is softer than the material of traditional aircraft propellers. It will not hurt your fingers during work.

[0154] The maximum width of the fin of the lifting propeller is smaller than the length of the fin and larger than one quarter of the length of the fin, and at least three fins are provided.

[0155] In order to ensure sufficient thrust, traditional aircraft usually reduce the fin width and increase the propeller speed. However, the present invention significantly increases the fin width. By increasing the thrust at low speed and reducing the speed, the required propulsion effect is achieved. The pain of hand touch is reduced and the noise is reduced. The technical prejudice is overcome and unexpected technical effects are achieved.

[0156] When the lifting propeller is rotating, at least one-third of the working surface of the fin has an angle greater than 20 degrees and less than 45 degrees with the rotating surface. The working surface refers to the surface that provides effective thrust in the working state.

[0157] The propeller fins of conventional aircraft (such as rotorcraft) that use propellers to provide lift generally have an angle between the fins and the rotating surface within 15 degrees, preferably within 10 degrees, to reduce resistance. This allows propellers to achieve a higher speed, which is beneficial to the power output of the motor and produces a larger and more stable thrust.

[0158] The present invention overcomes technical prejudice and adopts fins with an angle greater than 20 degrees. Since the present invention uses the airbag 2 to provide buoyancy, the stability of the flight has been provided with a basic guarantee by the airbag 2. For the application of the present invention, it does not, and is not suitable for, flights with short-term rapid turns or sudden changes in speed, and does not require rapid output of thrust and large thrust output. Therefore, for the application of the present invention, the use of fins with an angle greater than 20 degrees and less than 45 degrees has basically no effect on the flight performance. In addition, the present invention is a special structure with a shield above the propeller a, and the use of the above-mentioned angle is conducive to smooth air intake above.

[0159] When the fins with an angle greater than 20 degrees are selected, the resistance increases when rotating at a low speed, so when propeller A is operating normally, it is in a relatively low speed state, and the output thrust is relatively large at this time. Due to the low speed, the noise is small during normal operation, and the pain is less when the fingers touch it, or even no pain, which has unexpected technical effects. It is also conducive to the return of airflow above the lifting propeller.

[0160] Experiments show that when the angle is greater than 45 degrees, the air resistance is too large, which will keep propeller A in a low speed and high torque state for a long time, resulting in high energy consumption, and the motor is prone to overload and overheat, and the power output will be significantly reduced. Therefore, it is selected to be less than 45 degrees.

[0161] The rotation surface can be determined in the following way. Determine a point on the fin, and the fin rotates around the axis once. The surface where the circle drawn by the point lies is the rotation surface. This is one way to determine the rotation surface. Of course, there are other ways.

[0162] If the working surface of the fin is flat, the angle between the plane where the fin is located and the rotating plane is greater than 20 degrees and less than 45 degrees.

[0163] If the working surface of the fin is a curved surface, the angle between the plane where at least one-third of the working surface of the fin is located and the rotation plane is greater than 20 degrees and less than 45 degrees.

[0164] The area of ​​the plane in which at least one third of the portion lies can be obtained by integration.

[0165] Because the flexible structure is adopted, the fin angle may not meet the limit when not working or working at a low speed. As long as the fin angle meets the limit during normal operation, it meets the limit requirements of the present invention.

[0166] The flexible propeller A has an angle between at least one of the four areas of the working surface of the fin and the rotating surface that varies by more than 3 degrees in a stationary state and at least one working state. The working surface refers to the surface that generates thrust on the air when the propeller A is in the working state, or in other words, the surface that generates propulsion in the working state.

[0167] The above technical requirements define the degree of flexibility, which can be an increase of more than three degrees or a decrease of more than three degrees. The propeller a that meets this definition of flexibility has the advantages of low noise, low touch pain, or even no pain, and because of its flexibility, it can automatically adjust the angle due to different air resistance, so it can automatically adjust the speed and automatically cooperate with the power output of the motor.

[0168] A fixing portion is arranged on the upper side of the housing 1 for non-detachably fixing and connecting with the lower side of the airbag 2 .

[0169] The fixing part and the lower part of the airbag 2 are fixed by gluing, or by at least one of ultrasonic welding and thermal welding.

[0170] Non-detachable fixed connections will cause damage to the structure if forcibly removed.

[0171] The airbag 2 is a device that is easily damaged, while the housing 1 and the electronic system therein are devices that are not easily damaged. In traditional designs, two devices with significantly different service lives are often designed into a detachable structure for easy reuse.

[0172] However, this patent adopts a non-detachable mechanism to give up the feature of reuse in exchange for a strong structure and reduced weight.

[0173] Above the fixed part, an outer contour structure without sharp corners is adopted, and the surface above the fixed part is allowed to have an outer contour structure with a circular outer contour or an outer contour structure with a polygonal outer contour with rounded corners.

[0174] This prevents the sharp corners from piercing the airbag 2 when the user hits the airbag 2. In addition, because the edge of the shell 1 is adhered to the airbag 2, this design also avoids excessive tearing stress, thus protecting the airbag 2 from multiple aspects.

[0175] The fixing part adopts the surface located above the shell 1.

[0176] The fixing part adopts a surface located above the shell 1, and the contact area between the surface and the airbag 2 is not less than two square centimeters.

[0177] It is convenient to provide a sufficiently large fixing area.

[0178] More preferably, the fixing portion is a frame located above the housing 1 with a hollow center.

[0179] The frame structure reduces the fixing area but also reduces the weight, which is especially important for flight equipment using lightweight gas.

[0180] The coverage area drawn by the frame is not less than two square centimeters.

[0181] For example, the fixed part is a frame with a hollow center. The surface area of ​​the frame may be small, but the coverage area drawn by the frame can be large, preferably greater than two square centimeters, to ensure balanced force, optimize mechanical distribution, and ensure overall firmness.

[0182] When setting the steering function, because the airbag 2 is flexible, a relatively large contact area is set at the fixed part, or a relatively large area is framed, so when performing steering flight, the torque at the connection is guaranteed to be small, thereby avoiding problems such as obvious deformation, steering delay, and unstable and inaccurate steering. It also avoids the problem that after the steering thrust disappears, deformation rebound will occur, causing the steering angle to change again, causing steering shaking and increasing steering accuracy errors.

[0183] The control circuit 3 includes a signal input terminal and a signal output terminal, and the signal input terminal is connected to a distance sensor;

[0184] When the distance sensor senses that the height is lower than the set sensing height, the control circuit 3 controls the motor to drive the lifting propeller to provide lift;

[0185] When the distance sensor senses that the height is higher than the set sensing height, the power supply to the motor is stopped.

[0186] Set the sensing height to less than two meters.

[0187] The set sensing height mentioned here is not limited to an actual height, but the data information reflected by the distance sensor. Due to different external environments, there will be differences between the reflected height and the actual height.

[0188] The present invention realizes automatic positioning of the flight altitude through altitude feedback, reduces the difficulty of use for users, and users do not need to worry about altitude control. When the altitude is higher than the set sensing altitude, the technical solution adopted is not to reverse the lifting propeller a3 to accelerate the adjustment of the altitude, nor to reduce the speed of the propeller a to make the flight altitude return smoothly, but to directly stop the power supply to the motor and stop the lifting propeller.

[0189] When the altitude is too high, the motor stops rotating, which is a technology not suitable for traditional aircraft design. It will cause the aircraft to fall rapidly and lose balance.

[0190] This patent overcomes the prejudice of the prior art and adopts a solution of stopping the motor based on the aerodynamic characteristics of the airbag 2.

[0191] This design is based on the special structure and special application of the aircraft of the present invention. It is not necessary to use the traditional scheme of low propeller a speed to make the flight altitude return steadily, and directly shutting down the motor can also make the aircraft return to altitude steadily.

[0192] The aircraft of the present invention has an airbag 2 structure, and the free fall speed is much slower than that of a traditional aircraft. Moreover, due to the air resistance of the airbag 22, the reverse rotation of the lifting propeller a3 cannot bring about a very obvious altitude acceleration adjustment.

[0193] The solution of stopping the motor also reduces the structural requirements for the flexible propeller a compared to reducing the speed of the propeller a and reversing.

[0194] The present invention directly adopts the solution of stopping the lifting propeller, which ensures the stability of the aircraft's descent height, avoids excessive energy consumption and cost increase, and does not affect the user experience. In particular, the present invention is applied to toy aircraft, which will not affect the experience. Therefore, it has an unexpected technical effect.

[0195] The sensing height is set below 2 meters, which is suitable for indoor flight and easy to interact with users, including physical interaction.

[0196] More preferably, the sensing height is set between 0.2 meters and 1.5 meters.

[0197] It is suitable for indoor flight and is easy to carry out interactive activities including physical interaction with children under ten years old.

[0198] The distance sensor includes an infrared light emitting diode and an infrared receiving sensor; the light emitting direction of the infrared light emitting diode is downward, and the light receiving side of the infrared receiving sensor is downward.

[0199] The aforementioned downward direction is not limited to vertically downward direction, and may be slightly inclined.

[0200] There is another solution. The distance sensor includes an ultrasonic generator and an ultrasonic receiving sensor; the sound emitting direction of the ultrasonic generator is downward; and the sound receiving direction of the ultrasonic receiver is downward.

[0201] Ultrasonic waves can facilitate greater height positioning feedback, and because ultrasonic height positioning is not affected by the color of the ground and is basically unaffected by the ground material, the aerial positioning height will not be affected by the different colors and materials of the user's floor.

[0202] The volume of the airbag 2 is set to be greater than 3000 cubic centimeters and less than 35000 cubic centimeters.

[0203] Furthermore, the height of the airbag 2 after inflation is preferably greater than 10 cm and less than 30 cm, and the length is preferably greater than 20 cm and less than 50 cm.

[0204] Above the air bag 2, there is a block of liquid-absorbing material as a counterweight.

[0205] The weight is adjusted by the amount of liquid (water, oil, alcohol, etc.) absorbed by the absorbent material block.

[0206] The method of use is: when the counterweight needs to be increased, liquid is injected into the liquid-absorbing material block; when the counterweight needs to be reduced, liquid is squeezed out from the liquid-absorbing material block.

[0207] Advantages of the above design:

[0208] First, the counterweight is arranged above the airbag 2 instead of being arranged on the shell 1, which reduces the complexity of the shell 1. In addition, the liquid used as the counterweight is remotely isolated from the circuit in the shell 1, thereby protecting the circuit.

[0209] Second, liquid is used as the counterweight instead of the traditional solid counterweight with a specific shape. The counterweight is easy to obtain, low cost, can be "infinitely" accurately adjusted, and the reduced weight can be discarded without storage.

[0210] Third, a liquid-absorbing material block 4 is used instead of a simpler liquid container. The capillary phenomenon of the liquid-absorbing material block 4 is utilized to evenly disperse the liquid used as a counterweight, keep the center centered and stable, and avoid the problem of liquid shaking in the liquid container, so that the aircraft can fly smoothly after being hit.

[0211] It is further designed that a liquid absorbing material block 4 is bonded on the air bag 2.

[0212] Adopt simple structure to reduce weight and improve stability.

[0213] The thickness of the liquid-absorbing material block 4 is less than 5 mm, and the coverage area is greater than 1 square centimeter and less than 9 square centimeters.

[0214] The utility model not only has the advantages of small volume, low center of gravity and difficulty in liquid spilling after being hit, but also has adjustable counterweight weight, which can meet the requirements of indoor balloons (airbags 2).

[0215] In a further design, a liquid-absorbing material block 4 is fixed above the airbag 2, the liquid-absorbing material block 4 is covered with a plastic film sleeve, and the plastic film sleeve is provided with an opening.

[0216] The setting of the plastic film sleeve has a very low weight increase, and can limit the evaporation of the liquid, and further prevent the liquid from scattering when tapping. The liquid can be injected or discharged through the opening, which is convenient to use. When reducing the weight operation, the hands can be kept clean during the liquid squeezing process.

[0217] Furthermore, the opening of the plastic film sleeve is an upwardly open opening.

[0218] The upward opening further prevents the liquid from being scattered when tapping, and facilitates the liquid to be injected from top to bottom. The opening is set to be open, which simplifies the structure and operation.

[0219] The liquid-absorbing material block 4 is at least one of a sponge-structured material block, a cloth material block, a cotton material block, and a paper material block.

[0220] During storage and transportation after packaging:

[0221] It also includes a packaging box, in which the airbag 2 is filled with helium but not full and is placed inside the packaging box, and the airbag 2 is provided with an inflation port; it also includes an inflatable air bag filled with helium, and the inflatable air bag is provided with an external inflation port.

[0222] In the traditional helium balloons, which need to be stored and transported, a flattened air ball (air bag 2) is used, plus an air tank.

[0223] This patent overcomes the prejudice of the prior art, adopts the form of filling the airbag 2 with helium but not fully filling it, and matches it with an inflatable air bag to carry out the sale that needs to be stored and transported. Under the premise of ensuring the demand for helium, the cost is greatly reduced.

[0224] The airbag 2 is in a partially inflated state, and the inflation amount is greater than 50% of the saturated inflation amount and less than 85% of the saturated inflation amount.

[0225] For example, when the airbag 2 is filled with gas and the inflation volume is 3000 cubic centimeters, only 1500 cubic centimeters to 2550 cubic centimeters of helium are introduced.

[0226] In actual use, users will use the airbag 2 that is fully filled or nearly filled. However, the inventors have noticed that the airbag 2 that needs to be stored and transported is easy to rupture when it is fully filled and easy to lose helium due to gas diffusion. By assembling the airbag 2 that is not fully inflated in the packaging box to reduce the internal air pressure, the flexibility of the airbag 2 can be used to withstand strong impact without rupture. Even if the packaging box is squeezed and deformed, the airbag 2 can adapt to the deformation and avoid rupture.

[0227] By lowering the internal air pressure, the diffusion of helium is reduced, thus extending the shelf life.

[0228] The amount of helium in the inflatable air bag is not less than the amount of helium in the supplementary air bag 2 until it is full.

[0229] For example, in the packaging box, the inflation volume of the airbag 2 is 70%, and the amount of gas in the inflated airbag is greater than 30% of the inflation volume of the airbag 2.

[0230] The inflatable air bag is in a partially inflated state, and the inflation amount is greater than 50% of the saturated inflation amount and less than 85% of the saturated inflation amount.

[0231] For example, when an inflatable air bag is filled with gas, the volume is 3000 cubic centimeters, so only 1500 cubic centimeters to 2550 cubic centimeters of helium are introduced.

[0232] The inventors noticed that the inflatable air bag is easy to rupture when it is fully inflated and loses helium due to gas diffusion. By installing an inflatable air bag that is not fully inflated in the packaging box to reduce the internal air pressure, the flexibility of the inflatable air bag can be used to withstand strong impact without rupture. Even if the packaging box is squeezed and deformed, the inflatable air bag can adapt to the deformation and avoid rupture.

[0233] By lowering the internal air pressure, the diffusion of helium is reduced, thus extending the shelf life.

[0234] The packaging box can be a corrugated box, a plastic box, or other boxes that are easy to transport.

[0235] A foam support is provided in the packaging box. Protective airbag 2.

[0236] Further systematization settings are:

[0237] The packaging box comprises at least one layer of corrugated paper, and an air bag 2 is installed in the packaging box.

[0238] A housing 1 is arranged below the airbag 2. A control circuit 3 is arranged in the housing 1. The control circuit 3 includes a signal input terminal and a signal output terminal. The signal input terminal is connected to a distance sensor. The signal output terminal is connected to a motor. The motor is linked to a propeller a.

[0239] The motor is fixed on the housing 1, and the propeller a is arranged below the housing 1. The propeller a is a propeller a that provides lift, and the propeller a is called a lifting propeller;

[0240] Above the airbag 2, there is a block of liquid-absorbing material as a counterweight;

[0241] The airbag 2 is filled with helium but not fully filled and placed in a packaging box. The airbag 2 is provided with an inflation port;

[0242] It also includes an inflatable air bag filled with helium, and the inflatable air bag is provided with an external inflation port;

[0243] The amount of helium in the inflatable air bag is not less than the amount of helium in the supplementary air bag 2 until it is full.

[0244] The above design is not only easy to transport and store, but also easy to fly, and the overall cost is greatly reduced compared to the traditional method of selling helium in gas tanks.

[0245] The shape of the airbag 2 after being inflated, such as a flying saucer, Superman, or a cloud.

[0246] It should be noted that the present invention is applicable to an aircraft. For an aircraft, a design that reduces weight while ensuring performance is progressive and has a positive effect; a design that finds an optimal balance point in terms of performance, weight, cost, equipment firmness, volume, ease of operation, and interactivity is also a progressive and positive design. The design points in the present invention almost all focus on these points. The progressiveness in this aspect is no longer emphasized one by one in the design.

[0247] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic positioning aircraft that is easy to play with, characterized by: It comprises a housing, in which a control circuit is arranged, the control circuit comprises a signal input terminal and a signal output terminal, and the signal input terminal is connected to a distance sensor; The signal output end is connected to a motor, which is linked to the propeller; Also included is a gas bag for containing a lightweight gas; The shell is arranged below the airbag, the electric motor is fixed on the shell, and the propeller is arranged below the shell and is a propeller that provides lift, and is called a lifting propeller.

2. The automatic positioning aircraft that is easy to play with according to claim 1, characterized in that: The airbag is filled with light gas, so that the sum of the gravity of the inflatable airbag and the automatic positioning aircraft that is easy to play with is slightly greater than the buoyancy. When the lifting propeller rotates at a low speed or stops, the airbag descends or stops on the ground. When the relative speed of the lifting propeller is high, it provides upward thrust to allow the airbag to hover or ascend. The adjustment is that the overall gravity of the airbag and the automatic positioning aircraft, which is easy to flap and play after being filled with light gas, is greater than the overall buoyancy, and the difference between the two is less than one tenth of the overall gravity; the control circuit adopts an active infrared proximity sensor circuit, and the distance sensor adopts an active infrared proximity sensor.

3. The automatic positioning aircraft that is easy to play with according to claim 1, characterized in that: The lifting propeller uses a propeller with at least one edge of the fin being made of a flexible material structure, which is called a flexible propeller. The flexible material means that when it touches the fingers during rotation, it will deform to avoid damage to the fingers; when the fingers leave, the shape and function will be restored.

4. The automatic positioning aircraft that is easy to play with according to claim 1, characterized in that: The propeller adopts a flexible propeller; the flexible propeller includes an integrated propeller made of flexible plastic and a hard shaft bushing; the integrated propeller includes a flexible plastic fin and a shaft hole located in the middle; the hard shaft bushing is embedded in the shaft hole and fixed; the shaft bushing is provided with a transmission shaft socket, which is directly or indirectly connected to the motor shaft through the transmission shaft socket.

5. The automatic positioning aircraft that is easy to play with according to claim 1, characterized in that: The maximum width of the fin of the lifting propeller is less than the length of the fin and greater than one quarter of the length of the fin, and at least three fins are provided; When the lifting propeller is rotating, at least one-third of the working surface of the fin has an angle greater than 20 degrees and less than 45 degrees with the rotating surface. The working surface refers to the surface that provides effective thrust in the working state.

6. The automatic positioning aircraft that is easy to play with according to claim 1, characterized in that: The propeller is a flexible propeller. In a static state and at least one working state, the angle between at least one of the four areas of the working surface of the fin and the rotating surface varies by more than 3 degrees.

7. The automatic positioning aircraft that is easy to play with according to claim 1, characterized in that: A fixing portion for non-detachably fixing and connecting with the bottom of the airbag is arranged on the upper side of the shell body, and the fixing method is at least one of gluing, ultrasonic welding and thermal welding.

8. The automatic positioning aircraft that is easy to play with according to claim 1, characterized in that: Above the fixed part, an outer contour structure without sharp corners is adopted, and the surface above the fixed part is allowed to have an outer contour structure with a circular outer contour or an outer contour structure with a polygonal outer contour with rounded corners.

9. The automatic positioning aircraft that is easy to play with according to claim 1, characterized in that: The fixed part is located on the surface above the shell, and the contact area between the surface and the airbag is not less than two square centimeters.

10. The automatic positioning aircraft that is easy to play with according to claim 1, characterized in that: The fixed part is a frame which is located above the shell and has a hollow middle portion; the coverage area drawn by the frame is not less than two square centimeters.

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