Air Pressure Change Rate Sensor Based on Origami Bistable Structure and Its Applications

Abstract

The present invention provides a pneumatic change rate sensor based on an origami bistable structure and its application. The sensor includes a sensor cavity structure, a reserve airbag, an origami bistable membrane, large-diameter and small-diameter vent holes, and a laser pair emission device. The sensor cavity structure consists of an upper plate, a middle shell, and a bottom plate to form a sealed detection cavity. The origami bistable membrane is formed by origami and has different rigidity regions, and is installed between the upper plate and the middle shell of the sensor. The large-diameter vent hole allows for rapid air intake, and the small-diameter vent hole is connected to the reserve airbag for slow air exhaust. The laser pair emission device interrupts the beam transmission signal when the membrane deforms. The present invention can monitor the pneumatic change rate in real time, can effectively judge the impact situation in protective products, has a simple structure, low cost, and strong anti-interference ability, is applicable to a variety of complex environments, and provides reliable safety monitoring for protective products.

Description

Technical Field

[0001] The present invention relates to the field of pressure sensors, and particularly to a pressure change rate sensor based on an origami bistable structure and its applications. Background Art

[0002] In many industrial fields and practical application scenarios, the accurate monitoring of gas pressure-related parameters is crucial. As a key device for measuring pressure, pressure sensors play an indispensable role in the modern technology system.

[0003] Currently, common pressure sensors mainly consist of a sensing element, a diaphragm, and a signal conditioning circuit. Their working principles are based on various physical effects, such as the piezoresistive effect (e.g., piezoresistive pressure sensors made of single-crystalline silicon materials, which determine pressure through resistance changes), the piezoelectric effect (quartz or ceramics generate charges under pressure to measure pressure), the capacitance effect (measuring based on the change in the capacitance value of a capacitor with pressure), and the strain effect (indirectly measuring pressure by measuring the strain of an elastic element, often using metal or semiconductor materials). After converting the pressure signal into an electrical signal, these sensors are processed by a signal processing unit for amplification, filtering, etc., and finally output an electrical signal related to the pressure.

[0004] However, the existing pressure sensor technologies have many limitations. When detecting gas changes in a reserve airbag, most traditional pressure sensors can only provide measurements of the initial pressure and the final pressure, and cannot monitor the instantaneous pressure change rate of the gas. For example, in airbag application scenarios, whether for safety protection, transportation buffering, or medical equipment, etc., understanding the change rate of the internal air pressure of the airbag at the moment of impact is crucial for evaluating airbag performance and ensuring safety, but existing sensors are difficult to meet this monitoring requirement. Similarly, when detecting the pressure change caused by the gas flow rate in a container, although there are devices such as gas flow meters or pneumatic proportional valves, they are each for detecting different parameters and are still insufficient in measuring the instantaneous change rate of gas pressure.

[0005] Specifically, traditional pressure sensors cannot capture and feedback the changes in instantaneous fluid flow rate in real time, and can only respond based on static or steady-state pressure values, which makes them have significant limitations in detecting the pressure change rate (i.e., the dynamic response of the fluid), and it is difficult to be used in scenarios that require immediate reflection of flow rate changes. Moreover, their reliance on electrical signal processing and output results in certain delays in signal transmission and processing, and they are not fast enough in reacting to rapid pressure fluctuations, and may not be able to respond in time to sudden fluid changes, limiting their reliability in dynamic detection. In addition, most existing pressure sensors are suitable for constant or slowly changing fluid environments, and it is difficult to provide accurate data feedback in non-steady-state flow or instantaneous change fluid environments, and they perform poorly in measuring rapidly changing fluid flow rates (such as air flow impacts).

[0006] In view of the deficiencies of the above-mentioned existing technologies, there is an urgent need for a new type of pressure sensor that can effectively monitor the instantaneous pressure change rate, adapt to complex environments, and does not rely on electricity, in order to meet the ever-developing industrial and practical application requirements. Summary of the Invention

[0007] The embodiments of the present invention provide a pneumatic change rate sensor based on an origami bistable structure and its application. Aiming at the defects of the current technology, such as the inability to measure the pressure change rate, response delay, and inability to cope with unsteady flow, it performs poorly in scenarios where the instantaneous pressure change rate needs to be monitored in real time, and it is difficult to meet the high-precision pressure monitoring requirements in complex environments.

[0008] The core technology of the present invention mainly takes the origami bistable membrane as the core component, utilizes its special structure and physical properties, combines with the sensor cavity, large and small diameter ventilation holes, and laser pair device, and realizes the precise monitoring and mechanical response of the instantaneous pressure change rate in the reserve airbag in a power-free environment through physical intelligent design.

[0009] In a first aspect, the present invention provides a pneumatic change rate sensor based on an origami bistable structure, comprising:

[0010] A sensor cavity structure, including a sealed detection cavity composed of a sensor upper plate, a middle shell, and a bottom plate. An origami bistable membrane is provided between the sensor upper plate and the middle shell;

[0011] A reserve airbag, connected to the sensor cavity structure;

[0012] An origami bistable membrane, formed by origami, is sealed and installed on the sensor upper plate, and the origami bistable membrane has different rigidity regions, which are realized by forming uneven-thickness interfaces on the membrane. The thin part serves as the crease of the origami, and the thick part serves as the panel;

[0013] Large and small diameter ventilation holes, both installed on the middle shell. The large diameter ventilation hole is used to quickly introduce gas, and when there is an instantaneous violent change in the gas in the reserve airbag, it can quickly fill the sealed detection cavity. The small diameter ventilation hole is connected to the reserve airbag, and the gas is slowly discharged through a trachea;

[0014] A laser pair device, installed on the sensor upper plate, blocks the laser signal of the laser pair device through the deformation of the origami bistable membrane. Thus, when there is a violent pressure change, the laser pair device interrupts the light beam and transmits a signal to the host computer to indicate that the reserve airbag has been impacted.

[0015] Further, an installation part is provided at the bottom of the origami bistable membrane, and the origami bistable membrane is connected to the sensor upper plate through the installation holes and connecting parts opened on the installation part.

[0016] Further, the installation part and the sensor upper plate are sealed by a sealing member.

[0017] Furthermore, the origami bistable membrane has at least three surfaces in addition to the bottom surface.

[0018] Furthermore, the origami bistable membrane has four surfaces in addition to the bottom surface.

[0019] Furthermore, the material of the origami bistable membrane is silicone rubber or TPU or paper.

[0020] Furthermore, both the large-diameter vent hole and the small-diameter vent hole are provided with pagoda joints.

[0021] Furthermore, the origami bistable membrane is an integrated structure.

[0022] In a second aspect, the present invention provides an application of an air pressure change rate sensor based on an origami bistable structure in protective products.

[0023] Furthermore, the protection products include transport cushioning devices and airbag products, which can be applied to mechanical arm protection with airbags, or protective airbags at the end of the motion stroke to detect severe collisions.

[0024] The main contributions and innovations of the present invention are as follows:

[0025] 1. Real-time monitoring of instantaneous pressure change rate

[0026] The origami bistable membrane structure of the present invention is unique and can deform instantly when the air pressure exceeds a certain threshold value. It can quickly respond to the instantaneous and drastic changes in the gas in the airbag through the large-diameter vents, and promptly trigger the laser shooting device to send a signal. It overcomes the defect that traditional pressure sensors can only respond based on static or steady-state pressure values and cannot capture instantaneous fluid flow rate changes in real time. It realizes real-time monitoring of the instantaneous pressure change rate caused by external impact in a closed airbag, and provides accurate pressure change feedback for protective products at the moment of impact.

[0027] 2. Based on physical intelligent design, no need to rely on electricity

[0028] The sensor uses the principle of physical intelligence, air viscosity and fluid mechanics combined with the mechanical deformation of the origami bistable structure to feedback pressure changes, and can work normally without power support. This makes it suitable for scenes such as extreme temperature, humidity or outdoor areas where it is inconvenient to wire or use electricity, greatly improving the application range and reliability of the sensor. Compared with traditional sensors that rely on electrical signal processing, it has obvious advantages in special environments.

[0029] 3. Strong dynamic feedback and integrated application capabilities of structural shapes

[0030] When the pressure change rate reaches the threshold, the morphological change of the origami bistable membrane can not only be directly observed, but also trigger the response of the host computer by blocking the laser signal of the laser pair device. This structural change can be conveniently connected to other trigger or feedback devices, enhancing the integrated application ability of the sensor and providing the possibility for the multi-functional design of protective products. Traditional pressure sensors are relatively limited in this regard.

[0031] 4. Strong anti-interference ability

[0032] Since it does not rely on electronic signal processing and completely generates structural changes based on the dynamic characteristics of air pressure flow rate, it avoids the sensitivity of traditional sensors to environmental interferences such as temperature, vibration, and noise, ensuring stability and reliability in complex environments. In the application of protective products, it can accurately monitor air pressure changes under harsh conditions, providing stable protection for safety. Existing sensors are vulnerable to interference and affect the measurement accuracy in complex environments.

[0033] 5. Good economy and durability

[0034] The structure is relatively simple, and the materials used such as silicone rubber, TPU, or paper have low costs and are not easily damaged by high-pressure impacts. It has a long service life and low maintenance costs. This makes it more economically advantageous in the large-scale application of protective products, while reducing the inconvenience caused by frequent sensor replacement, in sharp contrast to the high cost and vulnerability of traditional pressure sensors.

[0035] 6. Accurately distinguish pressure changes and improve the performance of protective products

[0036] Through the ingenious design of large-diameter and small-diameter vent holes, it can accurately distinguish instantaneous drastic changes and gentle pressure fluctuations, effectively judge the degree of impact on protective products (such as transportation buffer devices and airbag products), enabling protective products to make accurate responses in a timely manner according to the actual situation, improving the protection effect, and making up for the deficiency of inaccurate measurement of existing sensors in non-steady flow environments.

[0037] Details of one or more embodiments of the present invention are set forth in the following drawings and description, so that other features, objects, and advantages of the present invention become more concise and understandable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present invention and form a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0039] Figure 1 is a structural diagram of a air pressure change rate sensor based on an origami bistable structure according to an embodiment of the present invention;

[0040] Figure 2Stereogram of a barometric rate of change sensor based on an origami bistable structure according to an embodiment of the present invention;

[0041] Figure 3 is a structural diagram of an origami bistable membrane of a barometric rate of change sensor based on an origami bistable structure according to an embodiment of the present invention;

[0042] Figure 4 is a stereogram of an origami bistable membrane of a barometric rate of change sensor based on an origami bistable structure according to an embodiment of the present invention.

[0043] In the figure, 1, sensor cavity structure; 2, reserve airbag; 3, origami bistable membrane; 4, laser pair emission device; 5, large-diameter ventilation hole; 6, small-diameter ventilation hole; 7, seal; 8, mounting seat; 9, air pipe; 11, sensor upper plate; 12, middle shell; 13, bottom plate; 14, seal detection cavity; 31, thin part; 32, thick part; 33, mounting part. Detailed implementation manners

[0044] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with one or more embodiments of this specification. On the contrary, they are merely examples of devices and methods consistent with some aspects of one or more embodiments of this specification as detailed in the appended claims.

[0045] It should be noted that: In other embodiments, the steps of the corresponding methods are not necessarily executed in the order shown and described in this specification. In some other embodiments, the steps included in the method may be more or less than those described in this specification. In addition, a single step described in this specification may be decomposed into multiple steps for description in other embodiments; and multiple steps described in this specification may also be combined into a single step for description in other embodiments.

[0046] Currently, the following defects exist in traditional pressure sensors:

[0047] 1. Unable to measure the rate of pressure change: Traditional pressure sensors can only respond based on static or steady-state pressure values and cannot capture and feedback the changes in instantaneous fluid flow velocity in real time. This makes them have significant limitations in detecting the rate of pressure change (i.e., the dynamic response of the fluid) and is difficult to be used in scenarios where the change in flow velocity needs to be reflected immediately.

[0048] 2. Response delay: Traditional pressure sensors usually rely on electrical signal processing and output, resulting in certain delays in signal transmission and processing. Especially when measuring rapid pressure fluctuations, they are not responsive enough. This response delay may not be able to respond in time when facing sudden fluid changes, thus limiting their reliability in dynamic detection.

[0049] 3. Inability to handle unsteady flow: Most existing pressure sensors are suitable for constant or slowly changing fluid environments and are difficult to provide accurate data feedback in unsteady flow or instantaneously changing fluid environments. Therefore, they perform poorly when measuring rapidly changing fluid flow rates (such as air flow impacts).

[0050] Based on this, the present invention is based on an origami structure to solve the problems existing in the prior art.

[0051] Embodiment 1

[0052] The present invention aims to propose a pneumatic change rate sensor based on an origami bistable structure, which can solve the problem that traditional pressure sensors cannot directly monitor the instantaneous pressure change rate. It is designed to detect the instantaneous pressure change rate in a sealed airbag in a non-electric environment. Specifically, referring to Figure 1 and Figure 2 , the sensor includes:

[0053] A sensor cavity structure, including a sealed detection cavity composed of a sensor upper plate, a middle shell, and a bottom plate. There is an origami bistable membrane between the sensor upper plate and the middle shell;

[0054] In this embodiment, the tight assembly between the origami membrane, the upper and lower sealing rings between the sensor upper plate and the middle shell, and the bottom plate (sensor installation bottom plate) ensures airtightness, which is achieved by screws and sealing parts (such as sealing rings). The gas flow path is realized through large-diameter and small-diameter pagoda joints and corresponding ventilation holes.

[0055] A reserve airbag, connected to the sensor cavity structure;

[0056] In this embodiment, the reserve airbag is installed in the mounting seat below the sensor cavity structure and is connected to the small-diameter pagoda interface installed on the small-diameter ventilation hole by a trachea.

[0057] An origami bistable membrane, formed by origami (origami is not limited to using paper), is hermetically installed on the sensor upper plate, and the origami bistable membrane has different rigidity regions, which are realized by forming unevenly thick and thin interfaces on the membrane. The thin part serves as the crease of the origami, and the thick part serves as the panel;

[0058] In this embodiment, as Figure 3 and Figure 4As shown in the figure, the deformation threshold of the origami bistable membrane is determined by the thickness, hardness and α angle of the material. Flexible materials such as silicone rubber and TPU are selected so that the membrane can change its shape instantly at a specific pressure threshold, ensuring rapid feedback of pressure changes. The design of the membrane ensures that the structure is stable when the deformation threshold is not reached, but it bounces up quickly when the threshold is exceeded, providing a reliable physical response for air pressure monitoring.

[0059] like Figure 3 In the figure, we can see that the angle between the front and rear faces is angle α. Figure 3 The shape in the middle is the preferred shape of the present invention, and the raised part is the panel. The panel is the thick part, and forms a different rigidity area from the thin part. Moreover, this structure is different from other origami structures. Other origami structures can be folded from a piece of paper. This structure must be formed by cutting off a part of a piece of paper (still an integrated structure). Moreover, the key to this structure is that the fold part and the panel part must have a relatively obvious rigidity gradient, so the materials used include but are not limited to paper.

[0060] The key point is that the smaller the α angle is, the greater the angle change and the up and down displacement when the deformation occurs, and the more energy is required. There is no need to conduct experiments to prove it. The thickness at the crease and the thickness of the panel affect the rigidity gradient between the two. This thickness also directly affects the threshold of the bistable structure when it is deformed. The greater the thickness, the stronger the rigidity, the more energy is required, and the higher the deformation threshold is. This point does not need to be proved by experiments. The parameters of angle and thickness are obtained by conducting multiple airbag impact tests with bistable membranes of different thicknesses and angles. When the airbag with an air pressure of 10-20kpa is impacted, the internal pressure reaches 29kpa, the hardness is 50A, the α angle is 90°, and the bistable membrane with a thickness difference of 4mm between the crease and the panel will be triggered.

[0061] The large-diameter and small-diameter vent holes are both installed on the middle shell. The large-diameter vent hole is used to quickly introduce gas. When the gas in the reserve airbag undergoes an instantaneous and drastic change, it can quickly fill the closed detection cavity. The small-diameter vent hole is connected to the reserve airbag to achieve slow discharge of gas through the trachea.

[0062] In this embodiment, the difference between the diameters of the large-diameter and small-diameter vent holes utilizes the principles of air viscosity and fluid mechanics, so that the air pressure in the detection cavity can reflect an obvious air pressure change rate when the fluid velocity changes.

[0063] The laser beam device is installed on the upper plate of the sensor by means of screws and other connectors. The deformation of the origami bistable membrane blocks the laser signal of the laser beam device. Thus, when a drastic pressure change occurs, the laser beam device interrupts the light beam and transmits a signal to the upper computer to indicate that the reserve airbag is impacted.

[0064] In this embodiment, the laser beam interrupter device can be powered by a power source such as a battery, and a single-chip microcomputer or the like is used to process the signals of the laser beam interrupter device, without the need to perform electrical signal processing on the origami bistable film itself.

[0065] Among them, the change in the laser signal of the laser beam interrupter device in the present invention is only used as a triggering and indicating means, rather than relying on electronic signal processing like traditional sensors to achieve the pressure measurement function. The power consumption of the laser beam interrupter device is relatively small, and its main function is to transmit signals when a physical event of deformation of the origami bistable film occurs, rather than for the acquisition and processing of pressure signals. In a power-free environment, although the laser beam interrupter device itself requires power support, the overall sensor has a very low dependence on environmental power. In actual application scenarios, the laser beam interrupter device can be powered by a small battery or an energy harvesting device (such as a solar panel, etc., under light conditions) (the same applies to the upper computer power supply), which does not affect the deployment and use of the sensor in a power-free environment or an environment where wiring is inconvenient, and does not change the essence of the sensor working based on the principle of physical intelligence. It is essentially different from traditional pressure sensors that rely on electricity for signal processing and transmission throughout the process. Therefore, the presence of the laser beam interrupter device does not weaken the applicability of the sensor in a power-free environment. Instead, to a certain extent, it provides an intuitive and reliable signal output method, which is convenient for integration with other devices or systems, and is in line with the concept and goal of working in a power-free environment as a whole. In actual applications, whether to use the laser beam interrupter device or adopt other mechanical triggering methods to achieve signal transmission can be flexibly selected according to specific situations, further reflecting the flexibility and adaptability of the invention.

[0066] In this embodiment, the working principle of the present invention is as follows:

[0067] When the sealed airbag (reserve airbag) is impacted or squeezed by an external force, the internal gas quickly enters the sealed detection chamber through the vent hole of the large-diameter pagoda joint. If the gas change rate in the airbag is relatively high, the air pressure in the detection chamber will rapidly increase due to air viscosity and hydrodynamic effects. When it reaches the deformation threshold of the origami film, the film undergoes elastic deformation to block the beam of the laser beam interrupter device, thereby emitting an impact signal.

[0068] For the case of slow gas entry, due to the restriction of the small-diameter vent hole, the gas flow rate in the detection chamber is relatively low and will not reach the deformation threshold of the film, so the laser device is not triggered. This cooperative design of the large-diameter and small-diameter vent holes enables the sensor to accurately distinguish instantaneous drastic changes from gentle pressure fluctuations, providing a direct feedback on the air pressure change rate of the sealed airbag. It can be applied to the protection of robotic arms with airbags or the protection airbags at the end of the motion stroke to detect severe collisions.

[0069] Embodiment 2

[0070] Based on the same concept, the present invention also proposes an application of a pneumatic change rate sensor device based on an origami bistable structure in a protective product.

[0071] The feedback on the pressure change rate is achieved through the origami bistable structure, and it can work normally without any power support. This operating ability in a power-free environment makes it suitable for scenarios where wiring or power usage is inconvenient (such as extreme temperature, humidity, or field environments), improving the applicable range and reliability of the sensor.

[0072] When the pressure change rate reaches a specific threshold, the origami bistable structure can undergo a morphological change, thereby triggering an observation signal. This structural change not only allows users to directly observe through physical morphological changes but also can be used to connect other triggering or feedback devices, enhancing the integrated application ability of the sensor. Since the present invention is based on a physically intelligent structural design, the monitoring of the pressure change rate can be completed without relying on electronic components. This characteristic makes it have good applicability in harsh or power-free environments (such as outdoor equipment, extreme temperature environments). Moreover, it can distinguish between slow pressure changes and violent pressure fluctuations, accurately judging whether the airbag has been subjected to a sharp impact or extrusion. This ability can be widely applied to scenarios requiring impact detection, such as safety protection devices, transportation buffer systems, medical airbags, etc.

[0073] Embodiment III

[0074] Based on the same concept, this embodiment provides a pressure threshold test for the origami bistable membrane. As shown in Table 1 below:

[0075] Table 1

[0076]

[0077] Among them, the material composition and characteristics are as follows

[0078] Silicone rubber: A rubber material formed by cross-linking siloxane chains, having excellent high and low temperature resistance, good elasticity, weather resistance, and insulation.

[0079] o Characteristics: Soft, good elasticity, high temperature resistance (-60°C to +250°C), chemical corrosion resistance, ultraviolet resistance.

[0080] o Common applications: Sealing gaskets, insulating materials, medical devices, etc.

[0081] Single-sided coated hull paper: Processed from a hull paper substrate through single-sided coating, mainly composed of natural plant fibers, with a thin film material (such as polyethylene, polypropylene, etc.) coated on the surface to enhance its strength, water resistance, etc.

[0082] oFeatures: Environmentally friendly, biodegradable, surface coating provides certain waterproof performance, but the mechanical strength is relatively low.

[0083] oCommon applications: packaging materials, environmentally friendly products, etc.

[0084] PDMS silicone (polydimethylsiloxane): a polymer silicone material with good thermal stability, transparency and softness, commonly used in precision molds and medical fields.

[0085] oFeatures: transparent, flexible, high temperature resistant, low toxicity, good biocompatibility.

[0086] oCommon applications: medical devices, electronic packaging, molds, skin patches, etc.

[0087] TPU (thermoplastic polyurethane): A thermoplastic elastomer with good mechanical strength, wear resistance, oil resistance and elasticity, suitable for a variety of physical environments.

[0088] oFeatures: higher hardness and strength, wear resistance, oil resistance, good elasticity and aging resistance.

[0089] oCommon Applications: Sports equipment, automotive parts, shoes, hoses, etc.

[0090] The physical properties are as follows:

[0091] Hardness: Silicone rubber and PDMS silicone are generally softer, while TPU is relatively hard. The hardness of single-sided coated highland barley paper is affected by the coating and paper materials and is usually lower.

[0092] Elasticity: Silicone rubber, PDMS silicone and TPU all have good elasticity, especially silicone rubber and PDMS silicone. The elasticity of single-sided coated barley paper is poor.

[0093] Temperature resistance: Silicone rubber and PDMS silicone have good high and low temperature resistance, TPU also has a certain temperature resistance, but it is worse than silicone rubber. The temperature resistance of single-sided coated highland barley paper is relatively poor.

[0094] The chemical properties are as follows:

[0095] Chemical resistance: Silicone rubber, PDMS silicone and TPU have good chemical resistance and can withstand a variety of acids, alkalis and solvents, but silicone rubber and PDMS silicone are not resistant to strong acids and alkalis. Single-sided coated highland barley paper has weak chemical resistance and is easily affected by moisture and rot.

[0096] Waterproofness: There is a film layer on the surface of single-sided coated highland barley paper, but the overall waterproofness is poor. TPU has good waterproof performance, and silicone rubber and PDMS silicone are also very waterproof.

[0097] Environmental protection is as follows:

[0098] The single-sided coated hull paper is a natural plant material, with good environmental protection and degradability; although silicone rubber, PDMS silicone, and TPU are recyclable, their degradation performance is poor. In particular, silicone rubber takes a long time to naturally degrade.

[0099] The application scenarios are as follows:

[0100] Silicone rubber film: Widely used in high-temperature and chemical-resistant environments such as electronic product sealing, medical devices, and food contact materials.

[0101] Single-sided coated hull paper film: Mainly used for food packaging, eco-friendly bags, etc., emphasizing degradability and portability.

[0102] PDMS silicone film: Suitable for medical, electronic, and optical fields, especially in applications with high requirements for transparency, biocompatibility, and flexibility.

[0103] TPU film: Suitable for occasions such as automobiles, sports equipment, footwear, and packaging that require high mechanical strength, elasticity, and wear resistance.

[0104] In summary, the summary is as shown in Table 2 below:

[0105] Table 2

[0106]

[0107] It can be seen that the main differences between these materials lie in aspects such as mechanical properties, temperature tolerance, chemical stability, and environmental protection. The specific choice of material for the origami bistable film of the present invention depends on the usage scenario and requirements.

[0108] Those skilled in the art should understand that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as within the scope described in this specification.

[0109] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A barometric rate-of-change sensor based on an origami bistable structure, characterized in that, Comprising: A sensor cavity structure, including a sealed detection cavity composed of a sensor upper plate, a middle shell, and a bottom plate, with a folded paper bistable membrane provided between the upper plate and the middle shell; A reserve airbag, connected to the sensor cavity structure; A folded paper bistable membrane, formed by folding paper, hermetically installed on the sensor upper plate, and having different rigidity regions on the folded paper bistable membrane, which are realized by forming unevenly thick and thin interfaces on the membrane, with the thin part serving as the crease of the folded paper and the thick part serving as the panel; Large-diameter and small-diameter vent holes, both installed on the middle shell. The large-diameter vent hole is used to quickly introduce gas, and when there is an instantaneous and drastic change in the gas in the reserve airbag, it can quickly fill the sealed detection cavity. The small-diameter vent hole is connected to the reserve airbag, and the gas is slowly discharged through a trachea; A laser pair emission device, installed on the sensor upper plate, and the laser signal of the laser pair emission device is blocked by the deformation of the folded paper bistable membrane. Thus, when the pressure changes, the laser pair emission device interrupts the light beam and transmits a signal to the host computer to indicate that the reserve airbag has been impacted.

2. The air pressure change rate sensor based on the origami bistable structure according to claim 1, wherein An installation part is provided at the bottom of the folded paper bistable membrane, and the folded paper bistable membrane is connected to the sensor upper plate through the installation holes and connectors provided on the installation part.

3. The air pressure change rate sensor based on the origami bistable structure according to claim 2, characterized in that, A seal is provided between the installation part and the sensor upper plate for sealing.

4. The air pressure change rate sensor based on the origami bistable structure according to claim 1, wherein The folded paper bistable membrane has at least three surfaces other than the bottom surface.

5. The air pressure change rate sensor based on the origami bistable structure according to claim 4, characterized in that The folded paper bistable membrane has four surfaces other than the bottom surface.

6. A barometric change rate sensor based on an origami bistable structure according to any one of claims 1-5, characterized in that, The material of the folded paper bistable membrane is silicone rubber or TPU or paper.

7. A pneumatic change rate sensor based on an origami bistable structure according to any one of claims 1-5, characterized in that Pyramid connectors are provided on both the large-diameter vent hole and the small-diameter vent hole.

8. A pneumatic change rate sensor based on an origami bistable structure according to any one of claims 1-5, characterized in that, The folded paper bistable membrane is of an integral structure.

9. Application of a pneumatic change rate sensor based on a folded paper bistable structure according to any one of claims 1-8 in a protective product.

10. The application according to claim 9, characterized in that, The protective product includes a transportation buffer device and an airbag product.

Images