Inflatable gas film structure based on pneumatic power rotation

Abstract

According to the inflatable air film structure based on pneumatic power rotation, tangential reaction torque generated by air injection is used for directly driving the inflatable rotary air film part and the rotary part fixed to the inflatable rotary air film part to continuously rotate, so that an external motor, a power source and a transmission mechanism are thoroughly omitted, the overall structure is remarkably simplified, and the cost is reduced. The weight, the cost and the energy consumption are reduced, the electrical potential safety hazard is eliminated, and the application scene is widened; meanwhile, due to the design of the rotating assembly, the rotating motion is supported, more importantly, the main structure body and an inner cavity of the rotating inflatable type rotating air film piece are communicated in a fluid mode at a rotating interface, the overall air tightness of the system is maintained, and the stable inflation state of the structure and effective airflow power transmission are ensured; in addition, the arrangement of the specific deflection angle in the exhaust direction of the air holes of the air mold ensures that effective rotation driving torque can be generated, and the consistency of the directions of the multiple air holes ensures the stability of rotation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inflatable air film, in particular to an inflatable air film structure based on aerodynamic power rotation. BACKGROUND

[0002] Inflatable air film structures have been widely used in temporary buildings, advertising displays, landscape decorations, amusement facilities and other fields due to their light weight, quick inflation / deflation, convenient transportation and strong visual impact. With the increasing market demand, static inflatable models have been difficult to meet the growing demand for dynamic and interesting displays. In order to give the inflatable structure dynamic effects, the commonly used method in the prior art is to install independent electric rotating devices outside or inside the inflatable structure, such as motor-driven rotating platforms or transmission mechanisms. These electric devices drive the additional inflatable rotating air film components (which may be rigid or another set of inflatable bodies) to rotate around the inflatable main body in order to achieve a more eye-catching dynamic display purpose. This way of using external power source to achieve rotation is the mainstream technical solution in the industry to realize the dynamicity of inflatable structures.

[0003] However, the above-mentioned scheme relying on external electric devices to achieve rotation has many significant drawbacks. First of all, the motor and its supporting power supply and transmission mechanism significantly increase the complexity and manufacturing cost of the entire system, and introduce additional weight, which is not conducive to the lightweight and portability of the structure. Secondly, the motor needs power supply, which usually relies on external power lines or built-in batteries, which not only increases the difficulty of deployment (especially in outdoor environments without power supply), limits the flexibility of application scenarios, but also brings potential electrical safety hazards, such as the risk of electric shock in humid environments, and continuous power consumption also increases operating costs. Furthermore, in order to achieve the rotation function, a connection point needs to be set between the rotating component (such as the inflatable rotating air film component) and the main inflatable structure, and at this connection point, both the smoothness of the rotating motion and the air tightness of the inflatable structure need to be maintained to prevent air pressure loss, which puts high requirements on structure design and manufacturing process, and is difficult to achieve, high cost, and the air tightness is easy to fail after long-term use. Finally, the exposed motor, wires, transmission components, etc. not only affect the overall aesthetic simplicity and harmony of the inflatable structure, but also may have safety hazards (such as pinching risk) of mechanical movement, and increase the complexity of maintenance.

[0004] Therefore, the key problem to be solved in the field is: how to design a new type of inflatable air film structure that can abandon the complex, heavy and many drawbacks of external electric drive system, and instead use the airflow energy of the inflatable structure to efficiently and reliably drive the inflatable rotating air film component to achieve rotating motion, while ensuring the air tightness of the rotating connection part, and ultimately achieving the comprehensive goal of structure simplification, cost reduction, safety improvement, application scenario widening and visual effect improvement. SUMMARY

[0005] The present application aims to provide a pneumatic power based rotating inflatable air membrane structure to solve the problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0007] The present application provides a pneumatic power based rotating inflatable air membrane structure, which comprises:

[0008] An inflatable main structure, which is enclosed by a flexible and air-tight first fabric and has a first accommodating cavity formed inside, and an air inlet structure for communicating with an external air blower is arranged on the wall surface of the inflatable main structure;

[0009] An inflatable rotating air membrane part, which is enclosed by a flexible and air-tight second fabric and has a second accommodating cavity formed inside, and at least one air mold air hole serving as a source of exhaust thrust is arranged on the wall surface of the inflatable rotating air membrane part; the exhaust direction of the air mold air hole is arranged to have a deflection angle with the radial plane passing through the center rotating axis, so as to ensure that the airflow discharged from the air mold air hole can generate effective rotating driving torque; a plurality of air mold air holes are arranged on the inflatable rotating air membrane part, and the exhaust directions of all the air mold air holes are uniform;

[0010] A rotating assembly, which is mechanically connected between the inflatable main structure and the inflatable rotating air membrane part, and fluidly communicates the first accommodating cavity and the second accommodating cavity, and is used for supporting the inflatable rotating air membrane part to rotate relative to the inflatable main structure; the rotating assembly comprises:

[0011] A fixed component, which is fixedly installed on the wall surface of the inflatable main structure and constitutes a first airflow channel for leading the airflow from the first accommodating cavity;

[0012] A rotating component, which is fixedly installed on the wall surface of the inflatable rotating air membrane part and constitutes a second airflow channel for leading the airflow into the second accommodating cavity;

[0013] A rotating connection mechanism, which is used for enabling the rotating component to rotate relative to the fixed component around a preset center rotating axis;

[0014] The pressurized air flow supplied by the air blower enters the first accommodating cavity through the air inlet structure, and then part of the pressurized air flow sequentially flows through the first air flow channel and the second air flow channel to enter the second accommodating cavity, so as to inflate the inflatable rotary air film member, and finally the part of the air flow is sprayed out of the air film hole at high speed, and the tangential reaction torque generated by the air flow when sprayed out is used to drive the inflatable rotary air film member and the rotary component fixed thereto to rotate together around the central rotation axis.

[0015] Preferably, the fixed component is a hollow first inner shell, and the rotary component is a hollow first outer shell; the first inner shell and the first outer shell are coaxially nested with each other, and the central axes of the two are the central rotation axis.

[0016] Preferably, the rotary connection mechanism is a first shaft, which is arranged along the central rotation axis, one end of which is connected to the central part of the first inner shell, and the other end of which is connected to the central part of the first outer shell, so as to coaxially constrain the first inner shell and the first outer shell together and allow the first outer shell to freely rotate around the first inner shell.

[0017] Preferably, the first shaft is detachably axially fixedly connected to the first inner shell and the first outer shell by screws.

[0018] Preferably, a first mounting hole is formed in the wall of the inflatable main structure body corresponding to the position of the first inner shell; an annular first mounting structure is arranged on the outer peripheral wall of the first inner shell, and the edge area of the first mounting hole is tightly fixed to the first mounting structure, so as to form an air-tight connection between the first inner shell and the inflatable main structure body.

[0019] Preferably, the first mounting structure is an annular first fastening groove; the edge area of the first mounting hole of the inflatable main structure body is sleeved in the first fastening groove and is fixed in the first fastening groove by being surrounded by a tightening member and applying radial pressure.

[0020] Preferably, a second mounting hole is formed in the wall of the inflatable rotary air film member corresponding to the position of the first outer shell; an annular second mounting structure is arranged on the outer peripheral wall of the first outer shell, and the edge area of the second mounting hole is tightly fixed to the second mounting structure, so as to form an air-tight connection between the first outer shell and the inflatable rotary air film member.

[0021] Preferably, the second mounting structure is an annular second fastening groove; the edge area of the second mounting hole of the inflatable rotary air film member is sleeved in the second fastening groove and is fixed in the second fastening groove by being surrounded by a tightening member and applying radial pressure.

[0022] Preferably, the fixed component is a hollow structure of a second inner shell, the rotating component is a hollow structure of a second outer shell, the second inner shell and the second outer shell are coaxially nested with each other, the axis of the two is the center rotating axis, the rotating connection mechanism is a second axis, the second axis is arranged along the center rotating axis, one end of the second axis is connected with the center part of the second inner shell, the other end of the second axis is connected with the center part of the second outer shell, so as to coaxially constrain the second inner shell and the second outer shell together, and allow the second outer shell to freely rotate around the second inner shell.

[0023] Preferably, the fixed component is a hollow structure of a third inner shell, the rotating component is a hollow structure of a third outer shell, the outer side of the third outer shell is provided with a protective shell, the third inner shell, the third outer shell and the protective shell are coaxially nested with each other, the axis of the three is the center rotating axis, the rotating connection mechanism is a third axis, the third axis is arranged along the center rotating axis, one end of the third axis is connected with the center part of the third inner shell, the other end of the third axis is connected with the center part of the third outer shell, so as to coaxially constrain the third inner shell and the third outer shell together, and allow the third outer shell to freely rotate around the third inner shell.

[0024] The present application has the following beneficial technical effects relative to the prior art:

[0025] The present application provides a kind of based on aerodynamic power rotation's inflatable air film structure, utilize the tangential reaction torque generated by jet to directly drive inflatable rotary air film piece and the rotating component fixed with it continuously rotate, to completely save external motor, power supply and transmission mechanism, significantly simplify overall structure, reduce weight, cost and energy consumption, eliminate electrical safety hazard, widen application scenario;At the same time, the design of rotating assembly not only supports rotating motion, more critically, fluidly connects the internal chamber of main structure body and inflatable rotary air film piece at rotating interface and maintains the overall air tightness of system, ensures the stable inflation state of structure and effective airflow power transmission;In addition, the specific deflection angle setting of gas mold air hole exhaust direction ensures that effective rotating driving torque can be generated, and the consistency of multiple air hole directions guarantees the stability of rotation. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0027] Figure 1The schematic diagram of the inflatable air film structure based on the pneumatic power rotation provided by the present application;

[0028] Figure 2 The cross-sectional view of the inflatable rotating air film part of the embodiment 1 in the present application;

[0029] Figure 3 The installation schematic diagram of the rotating assembly of the embodiment 1 in the present application;

[0030] Figure 4 The installation schematic diagram of the rotating assembly of the embodiment 2 in the present application;

[0031] Figure 5 The installation schematic diagram of the rotating assembly of the embodiment 3 in the present application;

[0032] In the figure: 1: inflatable main structure, 2: air mold air hole, 3: inflatable rotating air film part, 4: first outer shell, 5: first shaft, 6: first inner shell, 7: external air blower, 8: screw, 9: second outer shell, 10: second inner shell, 11: second shaft, 12: tightening part, 13: first bolt, 14: protective shell, 15: second bolt, 16: third bolt, 17: third outer shell, 18: third shaft, 19: third inner shell, 20: nut. DETAILED DESCRIPTION

[0033] The serial numbers of the components in the present application, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. Unless otherwise specified, the "connection" and "coupling" in the present application include direct and indirect connection (coupling). In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] The present application aims to provide an inflatable air-supported structure based on aerodynamic power rotation to solve the problems in the prior art.

[0037] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0038] Embodiment 1:

[0039] The present embodiment provides an inflatable air-supported structure based on aerodynamic power rotation, referring to Figure 1 The inflatable main structure 1 is formed by high-frequency welding or sewing of a first flexible airtight fabric (420D, 840D oxford cloth attached to PVC in this embodiment) to form a closed first accommodating cavity. The fabric has high tear strength and excellent airtightness, and can withstand a continuous working internal pressure of 1.5 kPa without obvious creep. A circular air inlet structure is provided at the top of the inflatable main structure 1, and is connected to an external air blower 7 through a soft tube with an inner diameter of 16 cm. The air blower 7 continuously supplies pressurized air into the first accommodating cavity to maintain the internal positive pressure.

[0040] In the center of the top of the inflatable main structure 1, an inflatable rotating air film piece 3 is installed through a rotating assembly. The inflatable rotating air film piece 3 is in the form of a four-leaf fan in this embodiment, and is surrounded by a second flexible airtight fabric (oxford cloth attached to PVC) to form a second accommodating cavity. The ends of the four fan blades each have a gas mold air hole 2 with a diameter of 8 mm, and the exhaust directions of all the air holes are deviated by 30° from the radial plane passing through the center rotating axis in the same direction, so as to generate a consistent and stable tangential reaction torque. When the air blower 7 is working, a part of the pressurized airflow enters the second accommodating cavity through the airflow channel inside the rotating assembly in turn, so that the inflatable rotating air film piece 3 is quickly formed; then the airflow is sprayed out at high speed from the four gas mold air holes 2, and pushes the entire inflatable rotating air film piece 3 to rotate continuously and stably around the center rotating axis. Since all the power is derived from the airflow itself, any motor, battery or gear mechanism is not needed, so the weight of the system is significantly reduced, and the electrical safety hazard is completely eliminated.

[0041] Figure 2 and Figure 3The first implementation of the rotating assembly is shown in detail. The fixed component adopts a hollow cylindrical first inner shell 6 made of high-strength engineering plastic (PC / ABS alloy), and the top and bottom are provided with an annular first fastening groove. The first inner shell 6 is high-frequency welded to the edge of the first mounting hole on the inflatable main structure 1 through the annular first fastening groove to form an airtight connection; specifically, the fabric of the first mounting hole edge is sleeved into the groove, and then surrounded and subjected to radial compression force by a plastic binder 12 (width 6 mm, thickness 1 mm), so as to ensure that the reliable airtightness is maintained during long-term repeated inflation and deflation.

[0042] The rotating component adopts a hollow cylindrical first outer shell 4 coaxially nested outside the first inner shell 6, and the two are rotationally connected through a first shaft 5. The first shaft 5 is an ABS plastic hollow pipe, which is locked with the center bosses of the first inner shell 6 and the first outer shell 4 through M5 screws 8; the hollow structure not only reduces the weight, but also reserves a channel for wearing a safety rope or a cable. The mating gap between the first inner shell 6 and the first outer shell 4 is controlled to be within 0.2 mm, and food-grade silicone grease is used for lubrication, which can reduce the rotating friction resistance to below 0.3 N·m, so that the inflatable rotary air film component 3 can start to rotate under a pressure difference of 0.5 kPa.

[0043] The first inner shell 6 forms a first airflow channel inside, and the first outer shell 4 forms a second airflow channel inside; the two channels are connected at the shaft center to realize fluid communication between the first containing cavity and the second containing cavity. Since the first inner shell 6 and the first outer shell 4 are radially sealed by multiple O-rings (NBR 70° Shore hardness), the rotating interface can still maintain overall airtightness, ensuring that the internal pressures of the inflatable main structure 1 and the inflatable rotary air film component 3 do not interfere with each other and are independently stable.

[0044] Example 2:

[0045] Figure 4 The second implementation of the rotating assembly is shown, which is suitable for larger diameter or higher load application scenarios. The second inner shell 10 and the second outer shell 9 also adopt a coaxial sleeve structure, but the rotating connection mechanism is changed to a second shaft 11, which presses the second outer shell 9 in the second inner shell 10 to realize the end face locking of the second inner shell 10 and the second outer shell 9, and the carrying capacity is increased by about 40% compared with example 1. The remaining assembly mode and sealing principle are similar to example 1, and will not be repeated here.

[0046] Example 3:

[0047] Figure 5The third implementation of the rotating assembly is shown, the fixed part is a third inner shell 19 with a hollow structure, the rotating part is a third outer shell 17 with a hollow structure, the outer side of the third outer shell 19 is provided with a protective shell 14; the third inner shell 19, the third outer shell 17 and the protective shell 14 are coaxially nested with each other, the three coaxial axes are the central rotation axis, and are connected through the first bolt 13, the second bolt 15, the third bolt 16, the nut 20 and other connecting parts, the rotating connection mechanism is a third shaft 18, the third shaft 18 is arranged along the central rotation axis, one end of the third shaft 18 is connected with the central part of the third inner shell 19, and the other end of the third shaft 18 is connected with the central part of the third outer shell 17, so that the third inner shell 19 and the third outer shell 17 are coaxially constrained together, and the third outer shell 17 is allowed to freely rotate around the third inner shell 19. The remaining assembly mode and sealing principle are similar to those of the first embodiment, and will not be described again.

[0048] It should be noted that in addition to the above-mentioned "screw + tightening member" combination, the connection between the rotating assembly and the fabric can also use high-frequency welding, hot melt welding, PVC solvent adhesive bonding, TPU tape cold pasting, buckle insertion, magnetic attraction, riveting, knob locking, screwing, bolt positioning or a combination of multiple methods. For example, for a lightweight small air mold with TPU Oxford fabric, the fabric and the annular flange of the rotating shell can be directly welded by high-frequency hot pressing, eliminating the need for metal tightening members and further reducing weight.

[0049] Although the above embodiments all use circular rotating assemblies, the rotating assembly and the inflatable rotating air film part can also be in any irregular shape such as triangle, diamond, pentagon, hexagon, snowflake, star, cartoon animal outline, etc.; as long as a closed containing cavity is formed inside and the exhaust direction can generate a tangential torque, the pneumatic drive rotation can be achieved.

[0050] In addition to the four-hole scheme, the air mold air hole can also be arranged as a single hole, double holes, three holes or up to dozens of micro-hole arrays; the air hole cross section can be circular, elliptical, slit-shaped or irregular, and by adjusting the combination of hole diameter and deflection angle, different speed and torque requirements can be achieved.

[0051] The current example arranges the rotating assembly at the top of the inflatable castle, but it can also be arranged on the side wings of the inflatable slide, the inflatable advertising arch column, the floating platform guardrail of the inflatable water park or any visible part of the inflatable exhibit.

[0052] In addition to the Oxford fabric adhered to the PVC, the inflatable main structure and the inflatable rotating air film part can be replaced with any one or more composite layers such as Oxford fabric adhered to TPU, Oxford fabric adhered to PU, pure TPU, PU, PVC mesh fabric, PEVA, EVA film fabric, etc.; the shell and the shaft of the rotating assembly can also be made of aluminum alloy, stainless steel, carbon fiber composite material, nylon glass fiber composite material, silica gel, rubber, etc. to meet different strength, weight and weather resistance requirements.

[0053] The material of the rotating assembly can be zinc alloy die casting, aluminum alloy CNC machining, stainless steel precision casting, carbon fiber pipe + aluminum alloy flange composite structure, or even full silicone rubber coated parts, in order to balance the cost, strength and touch.

[0054] To improve the night display effect, LED light strips can be arranged inside the inflatable rotating air film, and waterproof cables can be passed through the hollow holes of the first shaft 5 or the second shaft 11. The LED power supply can use built-in button cell batteries, wireless charging coils or small hydro / wind power generation modules to further reduce external wiring.

[0055] Taking Example 1 as an example, the on-site assembly steps are as follows:

[0056] (1) Align the first inner shell 6 with the first mounting hole of the inflatable main structure 1, and embed the edge of the fabric into the first fastening groove;

[0057] (2) Use a hand packing tool to tighten the plastic binding member 12 to ensure that there is no visible gap between the first inner shell 6 and the fabric;

[0058] (3) Pre-install the first outer shell 4 to the second mounting hole of the inflatable rotating air film 3, and also fix it with the binding member;

[0059] (4) Apply silicone evenly on the surface of the first shaft 5, insert one end into the center hole of the first inner shell 6, and the other end into the center hole of the first outer shell 4, and lock it with M5 screw 8;

[0060] (5) Connect the air blower 7 and power on, and observe whether the inflatable rotating air film 3 rises smoothly and starts to rotate; if it shakes, you can adjust the deflection angle of the air film air hole 2 or increase or decrease the air volume of the air blower 7 to correct it;

[0061] (6) Daily maintenance only needs to supplement silicone lubrication and check the tightness of the binding member once every quarter, without electrical maintenance, which greatly reduces the operating cost.

[0062] The technical features of the above examples can be combined in any way. To make the description concise, not all possible combinations of technical features in the above examples are described, but as long as the combination of technical features does not exist contradictory, it should be considered as the scope of the present disclosure.

[0063] It should be noted that the components mentioned in the above examples are all general standard components or components known to those skilled in the art, and their structure and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods.

[0064] The principles and implementation manners of the present application are described by using specific examples, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. An inflatable film structure based on aerodynamic rotation, characterized in that, It includes: The inflatable main structure (1) is formed by a flexible and airtight first fabric, and a first accommodating cavity is formed inside it. An air intake structure for communicating with an external blower (7) is provided on the wall of the inflatable main structure (1). An inflatable rotating air film component (3) is formed by a flexible and airtight second fabric, which forms a second accommodating cavity inside. At least one air hole (2) is opened on the wall of the inflatable rotating air film component (3) as a source of exhaust thrust. The exhaust direction of the air hole (2) is set to have a deflection angle with the radial plane passing through the central rotation axis to ensure that the airflow discharged from the air hole (2) can generate an effective rotational driving torque. The inflatable rotating air film component (3) is provided with multiple air holes (2), and the exhaust direction of all air holes (2) is the same. A rotating assembly, mechanically connected between the inflatable main structure (1) and the inflatable rotating air film member (3), and fluidly communicating between the first accommodating cavity and the second accommodating cavity, the rotating assembly being used to support the inflatable rotating air film member (3) to rotate relative to the inflatable main structure (1); the rotating assembly includes: A fixing component is fixedly installed on the wall of the inflatable main structure (1) and forms a first airflow channel for drawing airflow from the first accommodating cavity; A rotating component is fixedly mounted on the wall of the inflatable rotating air film component (3) and forms a second airflow channel for introducing airflow into the second accommodating cavity; A rotating connection mechanism is provided to enable the rotating component to rotate relative to the fixed component about a preset central rotation axis. The pressurized airflow supplied by the blower (7) enters the first accommodating cavity through the air intake structure. Subsequently, part of the pressurized airflow flows sequentially through the first airflow channel and the second airflow channel and enters the second accommodating cavity to inflate and form the inflatable rotating air film component (3). Finally, this part of the airflow is ejected at high speed from the air hole (2) of the air mold. The tangential reaction torque generated when the airflow is ejected drives the inflatable rotating air film component (3) and the rotating component fixed thereto to rotate continuously around the central rotation axis.

2. The inflatable film structure based on pneumatic rotation according to claim 1, characterized in that, The fixed component is a hollow first inner shell (6), and the rotating component is a hollow first outer shell (4); the first inner shell (6) and the first outer shell (4) are coaxially nested together, and their axes are the central rotation axis.

3. The inflatable film structure based on pneumatic rotation according to claim 2, characterized in that, The rotating connection mechanism is a first shaft (5), which is arranged along the central rotation axis. One end of the shaft (5) is connected to the center of the first inner shell (6), and the other end is connected to the center of the first outer shell (4), thereby coaxially binding the first inner shell (6) and the first outer shell (4) together and allowing the first outer shell (4) to rotate freely around the first inner shell (6).

4. The pneumatically-driven rotating inflatable film structure according to claim 3, characterized in that, The first shaft (5) is detachably axially fixed to the first inner shell (6) and the first outer shell (4) by screws (8).

5. The inflatable film structure based on pneumatic rotation according to claim 2, characterized in that, A first mounting hole is provided on the wall surface of the inflatable main structure (1) at the position corresponding to the first inner shell (6); an annular first mounting structure is provided on the outer peripheral wall of the first inner shell (6), and the edge area of ​​the first mounting hole is tightly fixed to the first mounting structure, thereby forming an airtight connection between the first inner shell (6) and the inflatable main structure (1).

6. The inflatable film structure based on pneumatic rotation according to claim 5, characterized in that, The first mounting structure is an annular first fastening groove; the inflatable main structure (1) is fitted into the first fastening groove in the edge area of ​​the first mounting hole, and is fixed in the first fastening groove by the fastening member (12) surrounding it and applying radial pressure.

7. The inflatable film structure based on pneumatic rotation according to claim 2, characterized in that, A second mounting hole is provided on the wall surface of the inflatable rotating air film component (3) at the position corresponding to the first outer shell (4); an annular second mounting structure is provided on the outer peripheral wall of the first outer shell (4), and the edge area of ​​the second mounting hole is tightly fixed to the second mounting structure, thereby forming an airtight connection between the first outer shell (4) and the inflatable rotating air film component (3).

8. The inflatable film structure based on pneumatic rotation according to claim 7, characterized in that, The second mounting structure is an annular second fastening groove; the inflatable rotating air film component (3) is fitted into the second fastening groove in the edge area of ​​the second mounting hole, and is fixed in the second fastening groove by the fastening component (12) surrounding it and applying radial pressure.

9. The inflatable film structure based on pneumatic rotation according to claim 1, characterized in that, The fixed component is a hollow second inner shell (10), and the rotating component is a hollow second outer shell (9). The second inner shell (10) and the second outer shell (9) are coaxially nested together, with their axes being the central rotation axis. The rotating connection mechanism is a second axis (11), which is set along the central rotation axis. One end of the second axis (11) is connected to the center of the second inner shell (10), and the other end is connected to the center of the second outer shell (9), thereby coaxially constraining the second inner shell (10) and the second outer shell (9) together and allowing the second outer shell (9) to rotate freely around the second inner shell (10).

10. The inflatable film structure based on pneumatic rotation according to any one of claims 1-9, characterized in that, The fixed component is a hollow third inner shell (19), and the rotating component is a hollow third outer shell (17). A protective shell (14) is provided on the outside of the third outer shell (19). The third inner shell (19), the third outer shell (17), and the protective shell (14) are coaxially nested together, with their axes being the central rotation axis. The rotating connection mechanism is a third axis (18), which is set along the central rotation axis. One end of the third axis (18) is connected to the center of the third inner shell (19), and the other end is connected to the center of the third outer shell (17), thereby coaxially constraining the third inner shell (19) and the third outer shell (17) together and allowing the third outer shell (17) to rotate freely around the third inner shell (19).

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