Air pressure change rate sensor based on origami bistable structure and application thereof

Abstract

The invention provides an air pressure change rate sensor based on a paper folding bistable structure and application of the air pressure change rate sensor. The sensor comprises a sensor cavity structure, a storage air bag, a paper folding bistable film, a large-diameter vent hole, a small-diameter vent hole and a laser correlation device. A sensor cavity structure is a closed detection cavity formed by an upper plate, a middle shell and a bottom plate, a paper folding bistable membrane is formed by paper folding, has different rigid areas and is mounted between the upper plate and the middle shell of the sensor, a large-diameter vent hole is used for quickly feeding air, a small-diameter vent hole is connected with a storage air bag for slowly exhausting air, and a laser correlation device is used for interrupting light beam transmission signals when the membrane is deformed. The device can monitor the air pressure change rate in real time, can effectively judge the impact condition in a protection product, is simple in structure, low in cost, high in anti-interference performance and suitable for various complex environments, and provides reliable safety monitoring for the protection product.

Description

Technical Field

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

[0002] In many industrial fields and practical application scenarios, 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] At present, common pressure sensors are mainly composed of sensing elements, diaphragms and signal conditioning circuits. Their working principles are based on a variety of physical effects, such as piezoresistive effect (such as piezoresistive pressure sensors made of single-crystal silicon materials, which determine pressure by resistance changes), piezoelectric effect (quartz or ceramics generate charges under pressure to measure pressure), capacitance effect (measured based on the change in capacitor capacitance with pressure) and strain effect (measuring elastic element strain to indirectly measure pressure, often using metal or semiconductor materials). After these sensors convert pressure signals into electrical signals, they are amplified and filtered by the signal processing unit, and finally output electrical signals related to pressure.

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

[0005] Specifically, traditional pressure sensors cannot capture and feedback instantaneous changes in fluid flow rate in real time, and can only respond based on static or steady-state pressure values. This makes them significantly limited in detecting pressure change rate (i.e., fluid dynamic response), and difficult to use in scenarios that require instant reflection of flow rate changes. In addition, they rely on electrical signal processing and output, resulting in certain delays in signal transmission and processing. They do not respond quickly enough when measuring rapid pressure fluctuations, and may not be able to respond in time when faced with sudden fluid changes, limiting their reliability in dynamic detection. In addition, most existing pressure sensors are suitable for constant or slowly changing fluid environments. It is difficult to provide accurate data feedback in non-steady-state flow or instantaneous changing fluid environments, and they perform poorly when measuring rapidly changing fluid flow rates (such as airflow shock).

[0006] In view of the above-mentioned deficiencies of the 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 require electricity dependence, so as to meet the ever-evolving industrial and practical application needs. Summary of the invention

[0007] The embodiments of the present invention provide an air pressure change rate sensor based on an origami bistable structure and its application, which addresses the defects of current technology such as the inability to measure the pressure change rate, response delay, and inability to cope with non-steady-state flow, poor performance in scenarios requiring real-time monitoring of the instantaneous pressure change rate, and difficulty in meeting the needs of high-precision pressure monitoring in complex environments.

[0008] The core technology of the present invention is mainly to use the origami bistable membrane as the core component, utilize its special structure and physical properties, combine with the sensor cavity, large and small diameter vents and laser emitting device, through physical intelligent design, to realize the precise monitoring and mechanical response of the instantaneous pressure change rate in the reserve airbag in an electric-free environment.

[0009] In a first aspect, the present invention provides an air pressure change rate sensor based on an origami bistable structure, comprising: The sensor cavity structure includes a closed detection cavity composed of a sensor upper plate, a middle shell and a bottom plate, and an origami bistable membrane is arranged between the sensor upper plate and the middle shell; A reserve air bag connected to the sensor cavity structure; An origami bistable membrane is formed by origami and sealed and mounted on the upper plate of the sensor. The origami bistable membrane has different rigidity regions. The different rigidity regions are realized by forming an interface with uneven thickness on the membrane. The thin part serves as the crease of the origami and the thick part serves as the panel. 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. The laser beam device is installed on the upper plate of the sensor. The deformation of the origami bistable membrane blocks the laser signal of the laser beam device. 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.

[0010] Furthermore, a mounting portion is provided at the bottom of the origami bistable membrane, and is connected to the upper plate of the sensor via a mounting hole and a connector provided on the mounting portion.

[0011] Furthermore, the mounting portion and the upper plate of the sensor are sealed by a sealing member.

[0012] Furthermore, the origami bistable membrane has at least three surfaces in addition to the bottom surface.

[0013] Furthermore, the origami bistable membrane has four surfaces in addition to the bottom surface.

[0014] Furthermore, the material of the origami bistable membrane is silicone rubber or TPU or paper.

[0015] Furthermore, both the large-diameter vent hole and the small-diameter vent hole are provided with pagoda joints.

[0016] Furthermore, the origami bistable membrane is an integrated structure.

[0017] 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.

[0018] 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.

[0019] The main contributions and innovations of the present invention are as follows: 1. Real-time monitoring of instantaneous pressure change rate 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.

[0020] 2. Based on physical intelligent design, no need to rely on electricity 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.

[0021] 3. Strong dynamic feedback and integrated application capabilities of structural shapes When the pressure change rate reaches a threshold, the morphological change of the origami bistable membrane can not only be observed directly, but also trigger the host computer response by blocking the laser signal of the laser shooting device. This structural change can easily connect other trigger or feedback devices, enhancing the integrated application capability of the sensor and providing the possibility for the multifunctional design of protective products. Traditional pressure sensors are relatively limited in this regard.

[0022] 4. Strong anti-interference ability Since it does not rely on electronic signal processing, it produces structural changes based entirely on the dynamic characteristics of air pressure and flow rate, avoiding the sensitivity of traditional sensors to environmental interference 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 protection, while existing sensors are susceptible to interference in complex environments, affecting measurement accuracy.

[0023] 5. Good economy and durability The structure is relatively simple, and the materials used, such as silicone rubber, TPU or paper, are low-cost, and are not easily damaged by high-pressure shocks, with a long service life and low maintenance costs. This makes it more economically advantageous in large-scale applications of protective products, while reducing the inconvenience of frequent sensor replacement, in stark contrast to the high cost and fragility of traditional pressure sensors.

[0024] 6. Accurately distinguish pressure changes and improve the performance of protective products Through the ingenious design of large-diameter and small-diameter vents, it is possible to accurately distinguish between instantaneous drastic changes and gentle pressure fluctuations, and effectively judge the degree of impact on protective products (such as transport cushioning devices and airbag products). This allows the protective products to make timely and accurate responses based on actual conditions, thereby improving the protective effect and making up for the inaccurate measurement of existing sensors in non-steady-state flow environments.

[0025] The details of one or more embodiments of the invention are set forth in the following drawings and description so that other features, objects, and advantages of the invention are more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary 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: Figure 1 is a structural diagram of an air pressure change rate sensor based on an origami bistable structure according to an embodiment of the present invention; Figure 2 A three-dimensional diagram of an air pressure change rate sensor based on an origami bistable structure according to an embodiment of the present invention; Figure 3 is a structural diagram of an origami bistable membrane of an air pressure change rate sensor based on an origami bistable structure according to an embodiment of the present invention; Figure 4 is a stereoscopic diagram of an origami bistable membrane of an air pressure change rate sensor based on an origami bistable structure according to an embodiment of the present invention.

[0027] In the figure, 1. sensor cavity structure; 2. reserve air bag; 3. origami bistable membrane; 4. laser irradiation device; 5. large diameter air vent; 6. small diameter air vent; 7. seal; 8. mounting seat; 9. air pipe; 11. sensor upper plate; 12. middle shell; 13. bottom plate; 14. sealed detection cavity; 31. thin part; 32. thick part; 33. mounting part. DETAILED DESCRIPTION

[0028] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with one or more embodiments of this specification. Instead, 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.

[0029] It should be noted that: in other embodiments, the steps of the corresponding method are not necessarily performed 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 be combined into a single step for description in other embodiments.

[0030] At present, the transmission pressure sensor has the following defects: 1. Unable to measure the pressure change rate: Traditional pressure sensors can only respond based on static or steady-state pressure values, and cannot capture and feedback instantaneous fluid flow rate changes in real time. This makes them significantly limited in detecting the pressure change rate (i.e., fluid dynamic response), and difficult to use in scenarios that require instant reflection of flow rate changes.

[0031] 2. Response delay: Traditional pressure sensors usually rely on electrical signal processing and output, which leads to certain delays in signal transmission and processing, especially when measuring rapid pressure fluctuations. This response delay may not be able to respond in time when facing sudden fluid changes, thus limiting its reliability in dynamic detection.

[0032] 3. Unable to cope with non-steady-state flow: Most existing pressure sensors are suitable for constant or slowly changing fluid environments, but have difficulty providing accurate data feedback in non-steady-state flow or instantaneous changing fluid environments. Therefore, they perform poorly when measuring rapidly changing fluid flow rates (such as airflow shock).

[0033] Based on this, the present invention solves the problems existing in the prior art based on an origami structure.

[0034] Embodiment 1 The present invention aims to propose a pressure 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. The sensor is designed to detect the instantaneous pressure change rate in a closed airbag in a non-electric environment. Specifically, reference is made to Figure 1 and Figure 2 , the sensor comprises: The sensor cavity structure includes a closed detection cavity composed of a sensor upper plate, a middle shell and a bottom plate, and an origami bistable membrane is arranged between the sensor upper plate and the middle shell; In this embodiment, the tight assembly between the origami membrane between the sensor upper plate and the middle shell, the upper and lower sealing rings, and the bottom plate (sensor mounting bottom plate) ensures airtightness, which is achieved by screws and seals (such as sealing rings). The gas flow path is achieved by large-diameter and small-diameter pagoda joints and corresponding vent holes.

[0035] A reserve air bag connected to the sensor cavity structure; In this embodiment, the reserve air bag is installed in a mounting seat below the sensor cavity structure, and is connected to a small-diameter pagoda interface installed on the small-diameter vent hole by an air pipe.

[0036] An origami bistable membrane is formed by origami (origami is not limited to paper), sealed and mounted on the upper plate of the sensor, and the origami bistable membrane has different rigidity regions, which are realized by forming an uneven thickness interface on the membrane, with the thin part acting as the crease of the origami and the thick part acting as the panel; In this embodiment, if Figure 3 and Figure 4 As 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.

[0037] 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.

[0038] 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.

[0039] 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. 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.

[0040] 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.

[0041] In this embodiment, the laser irradiation device can be powered by a power source such as a battery, and the signal of the laser irradiation device is processed by a single chip microcomputer, etc., and there is no need to perform electrical signal processing on the origami bistable membrane itself.

[0042] Among them, the laser signal change of the laser shooting device in the present invention is only used as a trigger and indication means, and does not rely on electronic signal processing to achieve the pressure measurement function like traditional sensors. The laser shooting device consumes relatively little electricity, and its main function is to transmit signals when the physical event of the origami bistable membrane deformation occurs, rather than for the acquisition and processing of pressure signals. In an environment without electricity, although the laser shooting device itself requires power support, the overall dependence of the sensor on environmental power is extremely low. In actual application scenarios, the laser shooting device can be powered by a small battery or energy collection device (such as a solar panel, etc., under light conditions) (the same applies to the power supply of the host computer), which does not affect the deployment and use of the sensor in an environment without electricity or inconvenient wiring, and does not change the nature of the sensor's work 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 existence of the laser beam device does not weaken the applicability of the sensor in a non-electrical environment. On the contrary, it provides an intuitive and reliable signal output method to a certain extent, which is convenient for integration with other devices or systems. It is consistent with the overall concept and goal of working in a non-electrical environment. In actual applications, it is possible to flexibly choose whether to use a laser beam device or other mechanical triggering methods to achieve signal transmission according to specific circumstances, which further reflects the flexibility and adaptability of the invention.

[0043] In this embodiment, the working principle of the present invention is as follows: When the sealed airbag (reserve airbag) is impacted or squeezed by external force, the internal gas quickly enters the sealed detection cavity through the vent hole of the large-diameter pagoda joint. If the gas change rate in the airbag is high, the air pressure in the detection cavity will increase rapidly due to the air viscosity and fluid mechanics effect. When the deformation threshold of the origami membrane is reached, the membrane undergoes elastic deformation to block the beam of the laser irradiation device, thereby sending out an impact signal.

[0044] In the case of slow gas entry, due to the limitation of the small-diameter vent, the gas flow rate in the detection chamber is low and will not reach the deformation threshold of the membrane, so the laser device will not be triggered. This design of large-diameter and small-diameter vents enables the sensor to accurately distinguish between instantaneous drastic changes and gentle pressure fluctuations, providing direct feedback on the rate of change of air pressure in the closed airbag. It can be applied to the protection of a robotic arm with an airbag, or to the protective airbag at the end of the motion stroke, to detect severe collisions.

[0045] Embodiment 2 Based on the same concept, the present invention also proposes an application of an air pressure change rate sensor device based on an origami bistable structure in protective products.

[0046] The origami bistable structure provides feedback on the rate of pressure change and allows the sensor to operate normally without any power supply. This ability to operate without electricity makes it suitable for use in scenarios where wiring or electricity is inconvenient (such as extreme temperature, humidity or outdoor environments), increasing the sensor's applicability and reliability.

[0047] When the rate of change of pressure reaches a certain threshold, the origami bistable structure can undergo a morphological change, thereby triggering an observation signal. This structural change not only allows the user to directly observe through physical morphological changes, but can also be used to connect other trigger or feedback devices, enhancing the integrated application capabilities of the sensor. Due to the structural design of the present invention based on physical intelligence, the monitoring of the rate of change of pressure can be completed without relying on electronic components. This feature makes it suitable for use in harsh or powerless environments (such as outdoor equipment and extreme temperature environments). It can also distinguish between slow pressure changes and violent pressure fluctuations, and accurately determine whether the airbag is subjected to sudden impact or extrusion. This capability can be widely used in scenarios requiring impact detection, such as safety protection devices, transportation buffer systems, medical airbags, etc.

[0048] Embodiment 3 Based on the same concept, this embodiment provides a pressure threshold test of an origami bistable membrane. As shown in Table 1 below: Table 1

[0049] Among them, the material composition and characteristics are as follows Silicone rubber: A rubber material formed by cross-linking siloxane chains, which has excellent high and low temperature resistance, good elasticity, weather resistance and insulation.

[0050] oFeatures: soft, good elasticity, high temperature resistance (-60°C to +250°C), chemical corrosion resistance, and UV resistance.

[0051] oCommon Applications: Sealing gaskets, insulation materials, medical devices, etc.

[0052] Single-sided coated highland barley paper: It is made of highland barley paper substrate through single-sided coating. It is mainly composed of natural plant fibers and is covered with a layer of film material (such as polyethylene, polypropylene, etc.) on the surface to enhance its strength and water resistance.

[0053] oFeatures: Environmentally friendly, biodegradable, surface coating provides certain waterproof performance, but the mechanical strength is relatively low.

[0054] oCommon applications: packaging materials, environmentally friendly products, etc.

[0055] PDMS silicone (polydimethylsiloxane): a polymer silicone material with good thermal stability, transparency and softness, commonly used in precision molds and medical fields.

[0056] oFeatures: transparent, flexible, high temperature resistant, low toxicity, good biocompatibility.

[0057] oCommon applications: medical devices, electronic packaging, molds, skin patches, etc.

[0058] TPU (thermoplastic polyurethane): A thermoplastic elastomer with good mechanical strength, wear resistance, oil resistance and elasticity, suitable for a variety of physical environments.

[0059] oFeatures: higher hardness and strength, wear resistance, oil resistance, good elasticity and aging resistance.

[0060] oCommon Applications: Sports equipment, automotive parts, shoes, hoses, etc.

[0061] The physical properties are as follows: 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.

[0062] 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.

[0063] 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.

[0064] The chemical properties are as follows: 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.

[0065] 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.

[0066] Environmental protection is as follows: Single-sided coated highland barley paper is a natural plant material with good environmental protection and biodegradability; although silicone rubber, PDMS silicone and TPU are recyclable, their degradation performance is poor, especially silicone rubber, which takes a long time to degrade naturally.

[0067] The application scenarios are as follows: Silicone rubber film: widely used in high temperature and chemical resistant environments such as electronic product sealing, medical devices, and food contact materials.

[0068] Single-sided coated highland barley paper film: mainly used for food packaging, environmentally friendly bags, etc., focusing on biodegradability and lightness.

[0069] PDMS silicone film: suitable for medical, electronic, and optical fields, especially in applications with high requirements for transparency, biocompatibility, and flexibility.

[0070] TPU film: suitable for automobiles, sports equipment, shoes, packaging and other occasions that require high mechanical strength, elasticity and wear resistance.

[0071] In summary, the following table 2 summarizes: Table 2

[0072] It can be seen that the main differences between these materials lie in mechanical properties, temperature tolerance, chemical stability and environmental protection. The specific material selected for the origami bistable membrane of the present invention depends on the usage scenario and requirements.

[0073] Those skilled in the art should understand that the technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An air pressure change rate sensor based on an origami bistable structure, characterized in that: include: The sensor cavity structure comprises a closed detection cavity composed of a sensor upper plate, a middle shell and a bottom plate, wherein an origami bistable membrane is provided between the upper plate and the middle shell; A reserve air bag connected to the sensor cavity structure; An origami bistable membrane is formed by origami and sealed and mounted on the upper plate of the sensor. The origami bistable membrane has different rigidity regions. The different rigidity regions are realized by forming an interface with uneven thickness on the membrane. The thin part serves as the crease of the origami and the thick part serves as the panel. 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. A laser beam device is installed on the upper plate of the sensor. The deformation of the origami bistable membrane shields the laser signal of the laser beam device. When the pressure changes, the laser beam device interrupts the light beam and transmits a signal to the upper computer to indicate that the reserve airbag is impacted.

2. The air pressure change rate sensor based on the origami bistable structure as claimed in claim 1, characterized in that: A mounting portion is provided at the bottom of the origami bistable membrane, and is connected to the upper plate of the sensor via a mounting hole and a connecting piece provided on the mounting portion.

3. The air pressure change rate sensor based on origami bistable structure as claimed in claim 2, characterized in that: The mounting portion and the sensor upper plate are sealed by a sealing member.

4. The air pressure change rate sensor based on the origami bistable structure as claimed in claim 1, characterized in that: The origami bistable membrane has at least three surfaces besides the bottom surface.

5. The air pressure change rate sensor based on the origami bistable structure as claimed in claim 4, characterized in that: The origami bistable membrane has four surfaces besides the bottom surface.

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

7. The air pressure change rate sensor based on an origami bistable structure according to any one of claims 1 to 5, characterized in that: Both the large-diameter vent hole and the small-diameter vent hole are provided with pagoda joints.

8. The air pressure change rate sensor based on an origami bistable structure according to any one of claims 1 to 5, characterized in that: The origami bistable membrane is an integrated structure.

9. Application of an air pressure change rate sensor based on an origami bistable structure as described in any one of claims 1 to 8 in protective products.

10. The use according to claim 9, characterized in that The protective products include transport cushioning devices and airbag products.

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