A check air nozzle valve

Abstract

The present application provides a check air nozzle valve, which relates to the field of check valves. The check air nozzle valve includes a valve core, an elastic seal, and a valve sleeve. The valve core includes a ventilation part and a gas guiding part. One end of the ventilation part is set as an air inlet nozzle, and the other end is set as an air outlet. One end of the gas guiding part is set as a sealed gas guiding column, and the gas guiding column extends into the air outlet and is connected to the air outlet. The elastic seal is sleeved outside the gas guiding column and fits with the end of the air outlet. The valve sleeve is in interference fit with the valve core, and one end of the valve sleeve is sleeved outside the valve core and hermetically covers the butt joint of the air outlet and the gas guiding column. A pressing cavity is provided in the middle of the valve sleeve to ensure that when the valve sleeve is sleeved outside the valve core, the elastic seal can still be in its original state. The pressing cavity fits with the elastic seal. It solves the problems of traditional one-way valves such as cumbersome operation, redundant structure, short sealing life, and poor use flexibility.

Description

Technical Field

[0001] The present application relates to the field of check valves, and particularly to a check air nozzle valve. Background Art

[0002] Currently, in inflatable sealing devices, one-way valves are usually used to complete one-way air intake. For example, in respiratory protection equipment such as medical masks and industrial gas masks, the collaborative design of the airbag and the one-way valve is the core technology to ensure airtightness and wearing comfort.

[0003] Chinese Utility Model Patent with Publication No. CN221743277U discloses a medical one-way valve. It includes: a housing having a receiving cavity, with the two ends of the receiving cavity being an input end and an output end respectively; a bottom cover including a first mounting portion and a second mounting portion that are received in the receiving cavity and connected to each other. The second mounting portion is closer to the output end than the first mounting portion, and the cross-sectional dimension of the first mounting portion is larger than that of the second mounting portion. The inner surface of the housing is simultaneously attached and sleeved on the outer surfaces of the first mounting portion and the second mounting portion to seal the receiving cavity; a core is slidably disposed in the receiving cavity; an elastic member is pressed between the bottom cover and the core; and a sealing member can be pressed between the core and the housing. When liquid enters the receiving cavity from the input end, the core slides away from the input end to drive the sealing member away from the housing, and the liquid flows out from the output end. In this way, the reliability and sealing performance of the medical one-way valve can be improved.

[0004] Traditional one-way valves mostly rely on mechanical valves or complex internal drive mechanisms, and have problems such as cumbersome operation, redundant structure, short sealing life, and poor use flexibility, which severely limit the use scenarios and application prospects of traditional one-way valves. Summary of the Invention

[0005] The embodiments of the present application provide a check air nozzle valve, which solves the problems of cumbersome operation, redundant structure, short sealing life, and poor use flexibility of traditional one-way valves.

[0006] The embodiments of the present application adopt the following technical solutions:

[0007] The embodiments of the present application provide a check air nozzle valve, which includes:

[0008] A valve core, including a ventilation part and a gas guiding part. The ventilation part is of a hollow columnar and through design. One end of the ventilation part is set as an air inlet nozzle, and the other end is set as an air outlet. One end of the gas guiding part is set as a sealed gas guiding column, which extends into the air outlet and is connected to the air outlet. There is a gap for air flow between the gas guiding column and the air outlet. The inner wall of the air outlet is provided with multiple groups of gas guiding channels extending along its axial direction to the end of the air outlet.

[0009] An elastic seal is sleeved on the outside of the air guide column and fits with the end of the air outlet. When the elastic seal is in its original state, the elastic seal can cover the ends of all air guide channels. When the elastic seal is squeezed and deformed, the elastic seal can open the ends of some air guide channels.

[0010] The valve sleeve is a hollow cylindrical, through-type, elastic design. The valve sleeve and the valve core have an interference fit, and one end of the valve sleeve is sleeved outside the valve core and sealed around the joint between the air outlet and the air guide column. The other end of the valve sleeve is used to connect the inflatable material. An extrusion cavity is provided in the middle of the valve sleeve to ensure that the elastic seal can remain in its original state when the valve sleeve is sleeved outside the valve core. The extrusion cavity fits the elastic seal.

[0011] By adopting the above technical solution, part of the air guide channel is opened when the elastic seal is squeezed. According to different inflation speeds and air pressures, the deformation of the elastic seal can be adaptively adjusted, thereby adjusting the opening area of ​​the air guide channel to achieve precise flow control, which can adapt to rapid inflation and achieve micro-inflation adjustment. The elastic seal fully covers the end of the air guide channel in a natural state, and combined with the pre-tightening force of the valve sleeve extrusion chamber, a zero pressure relief seal is achieved, which greatly reduces the static leakage rate.

[0012] At the same time, the elastic design of the valve sleeve allows the user to squeeze the middle extrusion cavity of the valve sleeve with one hand, which in turn causes the elastic seal to deform. The operation required during the deformation of the elastic seal is much lower than that of a traditional valve. The user can inflate and deflate the airbag with one hand, and the operation is very flexible and simple.

[0013] Secondly, the axial extension direction of the air guide channel is consistent with the direction of the airflow. The high-speed airflow can wash away impurities such as dust and saliva, and the service life is greatly improved in a polluted environment. In addition, the elastic seal has a longer service life and lower replacement and maintenance costs than traditional valves.

[0014] In addition, the integrated valve core design can greatly reduce the leakage points caused by assembly errors, and the valve sleeve has an interference fit with the valve core, without the need for additional sealing rings or fasteners. This not only greatly reduces the production cost, but also makes the whole device lighter, making it more convenient to use and carry.

[0015] In summary, the check valve of the present invention solves the problems of cumbersome operation, structural redundancy, short sealing life, poor flexibility of use, etc. of traditional one-way valves at one time through the coordinated design of the valve core, elastic seal and valve sleeve. Its usage scenarios are more diverse and its application prospects are broader.

[0016] In an optional implementation, the elastic seal is a three-layer gradient hardness silicone ring, which is an inner layer, a middle layer, and an outer layer from the inside to the outside, wherein the outer layer has the highest hardness;

[0017] Multiple groups of circumferentially offset wedge-shaped notches are respectively formed on the surfaces of the inner layer, middle layer, and outer layer, and the notches of each layer are staggered in the circumferential direction;

[0018] A spiral guide groove is formed on the outer wall of the air guide column. When the elastic seal is compressed and deformed, the notch and the guide groove cooperate to form a spiral air intake channel.

[0019] By adopting the above technical solutions, through triple designs of gradient hardness control, notch geometry optimization, and dynamic deformation response, in the natural state, the high-hardness silicone rubber of the outer layer provides rigid support. Under the pre-tightening force of the extrusion cavity, the edges of the notches of the middle layer and the inner layer are closely attached to achieve sealing. Even if the elastic sealing ring is slightly extruded, only the inner layer will undergo a small amount of deformation, and the width of the notches at the force-bearing expansion is very small, so that the gas cannot form a continuous flow path, and the leakage rate approaches zero;

[0020] When the user squeezes the elastic seal, the notches of the inner layer are fully expanded under force, and the air flow enters the gap between the elastic seal and the air guide column formed by the expansion of the notches of the inner layer. Under the combined action of the squeezing force and the air pressure, the notches of the middle layer also undergo deformation, and the notch width further increases, forming a spiral air flow channel with the spiral guide groove. The air flow not only greatly speeds up the inflation speed through the spiral air flow channel, but also the spiral path extends the air flow contact surface, using centrifugal force to throw impurities to the outside of the channel to achieve the effect of self-cleaning. At the same time, it can also reduce the flow velocity noise.

[0021] Since the notches of the outer layer are hardly deformed due to the relatively hard material of the outer layer, the opening degree of the notches of the middle layer can be limited, effectively controlling the flow velocity stability and ensuring the overall service life of the elastic seal.

[0022] In an optional implementation manner, a UV-curable resin layer is coated on the outer surface of the elastic seal. Under normal conditions, the resin layer is in a flexible state, allowing the elastic seal to deform;

[0023] The extrusion cavity is provided with a light-transmitting window, and the ambient light irradiates the resin layer through the window, triggering the following response,

[0024] In a strong light environment (≥100,000 lux, including ultraviolet components), the resin layer hardens, and the elastic seal locks the air flow channel;

[0025] In a weak light environment (≤10,000 lux, without ultraviolet), the resin layer remains flexible, allowing the elastic seal to be squeezed and the air flow to pass through.

[0026] By adopting the above technical solution, when the user is working in a polluted environment, in order to prevent the elastic seal from deflating the airbag due to accidental contact, a strong flashlight that can emit ultraviolet light can be carried with them, and the ultraviolet component is used to trigger the rapid curing of the resin, thereby enhancing the stability of the elastic seal and improving the check valve effect of the air nozzle valve. When the operation is completed, the hardened resin layer is scraped off, and the performance of the elastic seal can be restored for repeated use, with relatively low maintenance costs.

[0027] In an alternative implementation, a heat-sensitive sealing film is provided at the joint between the elastic seal and the air guide column. When the temperature remains high, the sealing film forms pressure relief micropores.

[0028] By adopting the above technical solution, when the temperature reaches 80°C ± 2°C, the micropores automatically open, and the internal pressure of the airbag decreases by 60%, reducing the risk of the airbag bursting due to high temperature; the diameter of the micropores linearly expands with the increase in temperature to adapt to different overheating scenarios. The phase change material (PCM) absorbs heat and melts, which can delay the triggering time of the micropores and avoid accidental triggering of pressure relief due to short-term high temperature. When the temperature < 50°C, the micropores close, and the leakage rate returns to normal.

[0029] In an alternative implementation, the elastic seal is made of shape memory polymer (SMP), and its glass transition temperature (Tg) is set to 25 - 35°C;

[0030] The surface of the valve sleeve is provided with heat-conducting ribs for accelerating heat transfer when the human body squeezes the elastic seal.

[0031] By adopting the above technical solution, the glass transition temperature (Tg) of the shape memory polymer (SMP) is adjusted to be close to the human body surface temperature range, so that when the human body contacts the elastic seal using the extrusion cavity, the heat transferred can quickly trigger the softening of the SMP rubber ring. With the optimized heat-conducting rib structure, the heat transfer efficiency during human contact can be accelerated, so that the extrusion flexibility of the elastic seal can be improved without relying on active heating.

[0032] In a low-temperature working environment, the hardening of the elastic seal can ensure good sealing; in addition, in previous low-temperature operations, due to the hardening of the elastic seal, the elastic seal was easily damaged due to cold brittleness when being squeezed, resulting in a decrease in sealing performance. Now, the body temperature triggers the softening of the elastic seal, which not only improves the operation flexibility but also reduces the probability of damage to the elastic seal.

[0033] In an alternative implementation, a nickel-titanium memory alloy drive wire and a PVDF piezoelectric film layer are embedded in the elastic seal. The nickel-titanium memory alloy drive wire is helically coated around the circumference of the air guide column, and its phase change temperature matches the temperature of the gas exhaled by the human body and is electrically connected to the PVDF piezoelectric film layer to form a closed circuit;

[0034] The inner wall of the extrusion chamber is provided with an arc-shaped voltage-sensitive conductive groove. When the blowing air flow impacts the PVDF piezoelectric film layer, an instantaneous voltage is generated to drive the resistance heating of the nitinol shape memory alloy drive wire, causing the alloy wire to contract and generate an axial tensile force, forcing the ellipticity of the elastic seal to increase.

[0035] By adopting the above technical solution, the arc-shaped voltage-sensitive conductive groove converts the blowing pressure into an effective deformation load by matching the curvature radius of the PVDF piezoelectric film layer, enabling the piezoelectric film to generate a pulse voltage > 5V within 0.05 seconds. The helical layout of the nitinol alloy wire generates an axial contraction force, allowing the deformation amount of the ellipticity of the elastic seal to be dynamically adjusted according to the blowing intensity, and improving the air flow control accuracy. Through two operation modes of blowing (dynamic pressure trigger) and manual pressing (static mechanical trigger), the flexibility of use can also be greatly improved.

[0036] In an optional implementation manner, a limiting member for restricting the position of the valve sleeve is provided at the position of the air vent portion close to the air inlet nozzle.

[0037] By adopting the above technical solution, the limiting member provides a reference and restriction for the installation position of the valve sleeve, not only improving the assembly convenience, but also ensuring the stability of the assembly of the valve core and the valve sleeve.

[0038] In an optional implementation manner, multiple sets of supporting members for further supporting the valve sleeve are provided at one end of the air guiding portion far from the air guiding column.

[0039] By adopting the above technical solution, the supporting members can expand the cross-sectional area of the air guiding portion, thereby improving the stability of the assembly of the air guiding portion and the valve sleeve.

[0040] In an optional implementation manner, multiple sets of air distribution channels extending axially along the air guiding portion to the air guiding column are provided at one end of the air guiding portion far from the air guiding column. The number of the air distribution channels is an integer multiple of the number of the air guiding channels to shunt the gas discharged from the air guiding channels.

[0041] By adopting the above technical solution, the air distribution channels can perform gas shunting, accelerating the flow rate of the gas flowing out of the air guiding channels, thereby facilitating the rapid inflation of the airbag.

[0042] In an optional implementation manner, it further includes a supplementary air chamber detachably connected to the air inlet nozzle, and the supplementary air chamber is a flexible chamber body.

[0043] By adopting the above technical solution, when the user is in an environment where it is not convenient to remove the face mask for inflation, the user can supplement air by squeezing the elastic seal and using the supplementary air chamber at the same time, improving the use convenience and safety; at the same time, the setting of the supplementary air chamber can also directly protect the air inlet nozzle, preventing the air inlet nozzle from being directly exposed to the air and being polluted.

[0044] In summary, the present application includes at least one of the following beneficial technical effects:

[0045] 1. Through the collaborative design of the spool, elastic seal, and valve sleeve, the check air nozzle valve of the present invention solves the problems of cumbersome operation, redundant structure, short sealing life, and poor flexibility of use of traditional one-way valves at one time. Its usage scenarios are more diverse and its application prospects are also broader.

[0046] 2. Through the collaborative design of gradient hardness, notch diversion, and spiral channels, the technical contradiction of "low-pressure air leakage - medium-pressure inefficiency - high-pressure risk" of traditional air nozzle valves is overcome, improving the usage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic structural diagram of Embodiment 1.

[0048] Figure 2 is a schematic diagram designed to highlight the connection structure between the ventilation part and the valve sleeve.

[0049] Figure 3 is a schematic diagram designed to highlight the connection structure between the ventilation part and the air guide part.

[0050] Figure 4 is a schematic diagram designed to highlight the internal structure of the ventilation part.

[0051] Figure 5 is a schematic cross-sectional view of Embodiment 2.

[0052] Figure 6 is a schematic structural diagram of the air guide part in Embodiment 2.

[0053] Figure 7 is a schematic structural diagram of the elastic seal in Embodiment 3.

[0054] Figure 8 is a schematic structural diagram of the valve sleeve in Embodiment 4.

[0055] Figure 9 is a schematic cross-sectional view of Embodiment 5.

[0056] Figure 10 is a schematic structural diagram of the elastic member in Embodiment 5.

[0057] Figure 11 is a schematic structural diagram of the valve sleeve in Embodiment 6.

[0058] Figure 12 is a schematic structural diagram of the valve sleeve in Embodiment 7.

[0059] Figure 13 is a schematic structural diagram of the elastic seal in Embodiment 7.

[0060] Figure 14It is a schematic diagram of the position of the air supplement chamber in Embodiment 8.

[0061] Explanation of reference numerals: 1, valve core; 11, air vent part; 111, air inlet nozzle; 112, air outlet; 113, air guiding channel; 114, limiting part; 12, air guiding part; 121, air guiding column; 122, spiral guiding groove; 123, supporting part; 124, air distributing channel; 2, elastic seal; 21, inner layer; 22, middle layer; 23, outer layer; 24, notch; 25, heat-sensitive sealing film; 261, nickel-titanium memory alloy driving wire; 262, PVDF piezoelectric film layer; 27, micro heat dissipation fins; 3, valve sleeve; 31, extrusion cavity; 311, window; 312, arc-shaped voltage-sensitive guiding groove; 32, heat conducting rib; 4, air supplement chamber. Detailed implementation manners

[0062] The following further elaborates on the present application in detail with reference to all the attached drawings in the embodiments of the present application.

[0063] The embodiments of the present application disclose a check air nozzle valve.

[0064] Embodiment 1

[0065] Refer to Figure 1 and Figure 2 The check air nozzle valve includes a valve core 1, an elastic seal 2 sleeved on the valve core 1, and a valve sleeve 3 covering both the valve core 1 and the elastic seal 2.

[0066] Among them, the valve core 1 is made of medical-grade polyetheretherketone and has the characteristics of high temperature resistance (continuous use temperature 250 °C) and chemical corrosion resistance (resistant to alcohol and hypochlorous acid disinfection).

[0067] The elastic seal 2 is a liquid silicone rubber ring, with dimethyl silicone oil added to improve wear resistance and hindered amine light stabilizer to extend the service life.

[0068] The material of the valve sleeve 3 is selected as thermoplastic polyurethane. One end of the valve sleeve 3 is sleeved on the valve core 1, and the other end is integrally formed with an inflatable object such as an airbag.

[0069] Refer to Figure 2 and Figure 3 Specifically, the valve core 1 includes an integrally formed air vent part 11 and an air guiding part 12. The air vent part 11 is designed as a hollow columnar and through type as a whole, with both ends open. One end of the air vent part 11 is set as the air inlet nozzle 111, and the other end is set as the air outlet 112. The user blows air from the air inlet nozzle 111, and the air flows out from the air outlet 112.

[0070] The inner surface of the air inlet nozzle 111 is smooth, and the inner diameter and outer diameter of the air inlet nozzle 111 do not increase or decrease from one end to the other end, ensuring unobstructed gas flow and facilitating the user to exert force with the mouth to blow air.

[0071] The inner surface of the air outlet 112 is also smooth, and the inner diameter of the air outlet 112 remains unchanged from one end to the other end of the air outlet 112, but the outer diameter of the air outlet 112 shows an increasing change. The end of the air outlet 112 with a larger outer diameter is close to the air inlet nozzle 111.

[0072] The end of the air outlet 112 with a smaller outer diameter is the starting end where the valve sleeve 3 is sleeved, thereby improving the convenience of sleeving the valve sleeve 3 on the valve core 1. At the same time, due to the gradual increase in the outer diameter of the air outlet 112, the pushing force of the valve core 1 on the end of the valve sleeve 3 also gradually becomes larger, which can improve the stability of the sleeving of the valve sleeve 3 and the valve core 1, and can also cooperate to improve the sealing performance of the valve sleeve 3 and the valve nozzle.

[0073] Refer to Figure 2 and Figure 4 On the outer wall of the air vent part 11, a limiting part 114 is integrally formed. The limiting part 114 is in the shape of an annular boss. The limiting part 114 is located at the critical position between the air inlet nozzle 111 and the air outlet 112, and the outer diameter of the limiting part 114 is larger than the maximum outer diameter of the air outlet 112.

[0074] One side of the limiting part 114 can abut against the end of the valve sleeve 3 to limit the position of the valve sleeve 3 sleeved on the valve core 1 and prevent the entire valve core 1 from falling into the valve sleeve 3. At the same time, the limiting part 114 provides a vertical shield for the end of the valve sleeve 3, further increasing the sealing performance of the valve sleeve 3 and the valve nozzle. The other side of the limiting part 114 can abut against the user's mouth to facilitate better exertion of force by the user's mouth when blowing air.

[0075] Refer to Figure 2 and Figure 3 Inside the air vent part 11, 4 air guiding channels 113 are provided. Each air guiding channel 113 is formed by 2 plate-shaped side walls, and the side walls are integrally formed with the inner wall of the air outlet 112, so that the air guiding channels 113 are located at the end of the air outlet 112 with a smaller outer diameter and extend along the axial direction of the air outlet 112.

[0076] The 4 air guiding channels 113 are evenly arranged along the circumferential direction of the air outlet 112 on the inner wall of the air outlet 112, so as to uniformly distribute the gas blown in from the air inlet nozzle 111 and accelerate the gas flow.

[0077] Correspondingly, one end of the air guiding part 12 is provided with a sealed air guiding column 121. The air guiding column 121 is in a conical shape, and the pointed end of the air guiding column 121 extends into the air outlet 112. A uniform gap is left between the periphery of the air guiding column 121 and the inner wall of the air outlet 112, and 4 connecting strips extend along the axial direction of the air outlet 112 from the pointed end of the air guiding column 121. The connecting strips are in one-to-one correspondence and connection with the side walls of the air guiding channels 113. After the gas flows through the air guiding channels 113, it will flow to the end of the air guiding part 12 under the conical design of the air guiding column 121.

[0078] Correspondingly, the end of the air guiding part 12 is designed to be cylindrical. The outer diameter of the end of the air guiding part 12 is larger than the maximum outer diameter of the air guiding column 121 and equal to the minimum outer diameter of the air outlet 112. A circular groove can be formed between the end of the air guiding part 12 and the air outlet 112, providing space for the rubber ring to be sleeved on the air guiding column 121.

[0079] Eight air distribution channels 124 are provided at the end of the air guiding part 12. The eight air distribution channels 124 are evenly arranged along the circumferential direction of the air guiding part 12 at the end of the air guiding part 12. Similarly, each air distribution channel 124 is formed by two plate-shaped side walls, and the side walls are integrally formed with the air guiding part 12, so that the air distribution channel 124 extends along the axial direction of the air guiding part 12.

[0080] The air distribution channels 124 are divided into four groups in pairs, and each group of air distribution channels 124 corresponds to an air flow channel, so as to further shunt the gas led out from the air guiding channel 113, further equalize the gas flow, and ensure the sufficiency of ventilation.

[0081] Four groups of supporting parts 123 are provided at the end of the air guiding part 12. The supporting parts 123 are chamfered convex platforms. The four groups of supporting parts 123 are arranged at intervals on the side walls of the eight air distribution channels 124, so as to expand the cross-sectional area of the air guiding part 12. When the valve sleeve 3 is sleeved on the valve core 1, the supporting parts 123 further support the valve sleeve 3, so as to improve the assembly stability of the valve core 1 and the valve sleeve 3.

[0082] Specifically, when the rubber ring is sleeved outside the air guiding column 121, the end face of the rubber ring covers and fits the end of the air flow channel. At this time, the periphery of the rubber ring protrudes from the end of the air outlet 112 and the end of the air guiding part 12, so as to facilitate pinching the rubber ring. When the rubber ring is in its original state, the rubber ring can cover the ends of all the air guiding channels 113. When the rubber ring is squeezed and deformed into an elliptical shape, the rubber ring can open at least two air guiding channels 113.

[0083] Furthermore, the valve sleeve 3 is designed to be hollow cylindrical, through and elastic. One end of the valve sleeve 3 is in interference fit with the outer wall of the air outlet nozzle, and the other end of the valve sleeve 3 is in interference fit with the supporting part 123, so as to realize the stable sleeving and tight covering of the valve sleeve 3 outside the valve core 1. At this time, the gas enters from the air inlet nozzle 111, passes through the air flow channel and flows out from the air outlet 112, and further flows to the end of the valve sleeve 3 under the design of the air distribution channel 124, so as to realize the gas flowing into the airbag.

[0084] Among them, an extrusion cavity 31 is provided in the middle of the valve sleeve 3. The inner and outer walls of the extrusion cavity 31 protrude from the inner and outer walls of the whole rubber ring. The extrusion cavity 31 can ensure that when the valve sleeve 3 is sleeved on the valve core 1, the rubber ring can still be in its original state and avoid being squeezed by the valve sleeve 3. The inner wall of the extrusion cavity 31 is in contact with the outer wall of the rubber ring, avoiding air leakage and making it more convenient for the user to squeeze the rubber ring.

[0085] The valve sleeve 3 is provided with recesses on both sides of the extrusion cavity 31 to better fit the ends of the air outlet 112 and the air guide portion 12, thereby avoiding loss of fit between the valve sleeve 3 and the valve core 1 due to the design of the extrusion cavity 31 and achieving better sealing.

[0086] In summary, during the inflation stage, the user squeezes the extrusion cavity 31 , the valve sleeve 3 deforms and compresses the rubber ring, the outer edge of the rubber ring rises, and at least two air guide channels 113 are opened, and air flows into the airbag through the gap and the air guide channels 113 .

[0087] During the pressure-maintaining stage, the user releases the valve sleeve 3, and the valve sleeve 3 elastically returns to its original position while the rubber ring also rebounds, so that the air guide channel 113 is completely closed and the air pressure is self-locked.

[0088] During the deflation stage, the user squeezes the extrusion cavity 31 again, the rubber ring deforms, and the gas in the airbag is discharged in the reverse direction through the air guide channel 113 .

[0089] When the rubber ring is squeezed, at least two air guide channels 113 are opened, and the deformation of the rubber ring can be adaptively adjusted according to different inflation speeds and air pressures, thereby adjusting the opening area of ​​the air guide channels 113 to achieve precise flow control, which can adapt to rapid inflation and achieve micro-inflation adjustment.

[0090] The rubber ring completely covers the end of the air guide channel 113 in a natural state, and combined with the pre-tightening force of the extrusion cavity 31, a zero pressure relief seal is achieved, which greatly reduces the static leakage rate.

[0091] At the same time, the elastic design of the valve sleeve 3 allows the user to squeeze the extrusion cavity 31 with one hand, which links the rubber ring to deform. The operation required during the deformation of the rubber ring is much lower than that of the traditional valve. The user can inflate and deflate the airbag with one hand, and the operation is very flexible and simple.

[0092] Secondly, the axial extension direction of the air guide channel 113 is consistent with the airflow direction, and the high-speed airflow can wash away impurities such as dust, saliva, etc., and the service life is greatly improved in a polluted environment; and the rubber ring has a longer service life than the traditional valve, and the replacement and maintenance cost is lower.

[0093] In addition, the integrated design of the valve core 1 can greatly reduce the leakage points caused by assembly errors, and the valve sleeve 3 is interference fit with the valve core 1, without the need for additional sealing rings or fasteners, which not only greatly reduces the production cost, but also makes the whole device lighter and more convenient to use and carry.

[0094] In summary, the check valve of the present invention solves the problems of cumbersome operation, structural redundancy, short sealing life, poor flexibility of use, etc. of traditional one-way valves at one time through the coordinated design of the valve core 1, elastic seal 2 and valve sleeve 3. Its usage scenarios are more diverse and its application prospects are broader.

[0095] Example 2

[0096] Refer to Figure 5 and Figure 6 The air nozzle valve of Embodiment 2 of the present application is specifically applied to an industrial gas mask. The difference from Embodiment 1 is as follows:

[0097] The air guide channel 113 is optimized. There are 12 air guide channels 113 on the inner wall of the air outlet 112, and the width of the air guide channel 113 is 0.5 mm, so as to adapt to the rapid inflation of high-pressure gas cylinders.

[0098] The elastic seal 2 is strengthened. The outer layer 23 of the elastic seal 2 is coated with a polytetrafluoroethylene (PTFE) coating, and the corrosion resistance is improved, which is suitable for chemical pollution environments.

[0099] The valve sleeve 3 is enhanced. A glass fiber reinforced layer is added to the valve sleeve 3, and the tear resistance is > 50 MPa, and it can withstand extreme temperatures from -40 °C to 120 °C.

[0100] At a pressure difference of 10 kPa, the leakage is very low, and the sealing performance is enhanced. Through the hierarchical opening of the air guide channel 113 and the design of the elastic seal 2, the air pressure-flow self-adaptive adjustment is realized, breaking through the binary control limitation of the traditional valve of "fully open / fully closed".

[0101] The elastic deformation of the extrusion cavity 31 and the tactile feedback mechanism improve the single-handed operation efficiency, especially beneficial to emergency scenarios such as first aid and fire fighting.

[0102] The integrated valve core 1 and the interference fit valve sleeve 3 eliminate the precision machining link, reduce the mass production cost, and at the same time meet the medical and industrial grade sealing requirements.

[0103] Embodiment 3

[0104] Refer to Figure 7 The difference between Embodiment 3 of the present application and Embodiment 1 is as follows:

[0105] The elastic seal 2 is a three-layer gradient hardness silicone rubber ring, which is formed by a three-layer co-extrusion process. It consists of an inner layer 21, a middle layer 22, and an outer layer 23 from inside to outside.

[0106] The inner layer 21 is made of liquid silicone rubber LSR-4305 (Shore hardness 30), the middle layer 22 is made of silicone rubber LSR-4350 (Shore hardness 50), and the outer layer 23 is made of silicone rubber LSR-4370 (Shore hardness 70), and the outer layer 23 has the highest hardness.

[0107] Multiple groups of circumferentially offset wedge-shaped notches 24 are respectively opened on the outer surfaces of the inner layer 21, the middle layer 22, and the outer layer 23. The notches 24 are opened on the outer surfaces of each layer of silicone rubber ring and are only shallow surface grooves.

[0108] The notches 24 of each layer are staggered in the circumferential direction. The position of the notch 24 in the middle layer 22 is circumferentially offset by 60° relative to the inner layer 21, and the position of the notch 24 in the outer layer 23 is further offset by 60° relative to the middle layer 22. In the natural state, the outer layer 23 presses the middle layer 22 against the inner layer 21 through a pre-tightening force, and the notches 24 of each layer are closed due to the misaligned distribution and elastic compression.

[0109] In this embodiment, each layer has 3 notches 24. Then, the notches 24 in the inner layer 21 are located at 0°, 120°, and 240°, the middle layer 22 is located at 60°, 180°, and 300°, and the outer layer 23 is located at 120°, 240°, and 360°.

[0110] A spiral guide groove 122 is provided on the outer wall of the air guide column 121. One end of the spiral guide groove 122 forms a 45° angle with the air guide flow channel. The end of the spiral guide groove 122 extends to the edge of the air outlet 112 and forms a continuous air flow path in combination with the notch 24.

[0111] A flow guiding rib is provided on the inner surface of the outer layer 23, and the inclination angle of the flow guiding rib matches that of the spiral guide groove 122.

[0112] When the elastic seal 2 is deformed under pressure, the notch 24 is elastically deformed under extrusion. The notches 24 on the outer surfaces of both the inner layer 21 and the middle layer 22 can be pushed open, and a gap can be formed between the inner surface of the silicone rubber ring and the air guide column 121. The silicone rubber ring and the spiral guide groove 122 cooperate to form a spiral air intake channel. When inflating, the air flow rotates and accelerates along the spiral channel.

[0113] When deflating, the centrifugal force throws out impurities (such as dust and saliva), and the service life is extended in a polluted environment. The offset design of the notches 24 of each layer avoids foreign objects from penetrating and getting stuck, and the stuck failure rate is reduced.

[0114] During the use process,

[0115] In the natural state (not under pressure), the high-hardness silicone rubber (Shore 70) of the outer layer 23 provides rigid support. Under the pre-tightening force of the extrusion cavity 31, the middle layer 22 (Shore 50) and the inner layer 21 (Shore 30) have the edges of the notches 24 closely attached to each other, realizing the closure of the notches 24 and being sufficient to block gas penetration.

[0116] In the very low air pressure state (0 - 0.1 kPa), only the soft rubber (Shore 30) of the inner layer 21 has a slight deformation, and the opening width of the notch 24 is less than the mean free path of gas molecules, so the gas cannot form a continuous flow path and the leakage rate approaches zero.

[0117] When inflating at low pressure (0.1 - 0.3 kPa), the user pinches the valve sleeve 3, the silicone rubber (Shore 30) of the inner layer 21 deforms preferentially, the notch 24 of the inner layer 21 opens, and the air flow passes straight through the notch 24 of the inner layer 21.

[0118] When medium-pressure inflation (0.5~1 kPa) occurs, the air pressure rises, the middle layer 22 silicone rubber (Shore 50) deforms, the notch 24 in the middle layer 22 and the spiral guide groove 122 form a spiral channel, the air flow rotates and accelerates, and the inflation efficiency is improved.

[0119] When high-pressure inflation (>1.5 kPa) occurs, the outer layer 23 silicone rubber (Shore 70) provides rigid support, restricts the deformation amount of the middle layer 22, the flow area of the spiral guide groove 122 is constant, and the air pressure is stabilized below 50 kPa.

[0120] When reverse deflation occurs, the spiral air flow flings the impurities attached to the notch 24 along the spiral guide groove 122, achieving zero-contact cleaning.

[0121] In summary, the elastic sealing ring realizes triple designs of gradient hardness control, geometric optimization of the notch 24, and dynamic deformation response. In the natural state, the high-hardness silicone rubber in the outer layer 23 provides rigid support. Under the pre-tightening force of the middle layer 22 and the inner layer 21 in the extrusion cavity 31, the edges of the notch 24 are closely fitted to achieve sealing.

[0122] Even if the elastic sealing ring is slightly extruded, only the inner layer 21 will undergo a small amount of deformation. The width of the notch 24 at the stressed part expands very little, and the gas cannot form a continuous flow path, and the leakage rate approaches zero.

[0123] When the user squeezes the elastic seal 2, the notch 24 in the inner layer 21 is fully expanded under force. The air flow enters the gap between the elastic seal 2 and the air guide column 121 formed by the expansion of the notch 24 in the inner layer 21. The air flow passes straight through the notch 24 in the inner layer 21 to achieve micro-inflation.

[0124] As the extrusion force and air pressure increase, the notch 24 in the middle layer 22 can also deform, the width of the notch 24 further increases, and a spiral air flow channel is formed with the spiral guide groove 122. The air flow passing through the spiral air flow channel not only greatly speeds up the inflation speed, but also the spiral path extends the air flow contact surface, uses the centrifugal force to fling the impurities to the outside of the channel, achieves the effect of self-cleaning, and at the same time can reduce the flow velocity noise.

[0125] The notch 24 in the outer layer 23 hardly deforms due to the harder material of the outer layer 23, so it can limit the opening degree of the notch 24 in the middle layer 22, effectively control the flow velocity stability, and ensure the overall service life of the elastic seal 2.

[0126] Example 4

[0127] Reference Figure 8 , the difference between Example 4 of this application and Example 1 is as follows:

[0128] After the surface of the elastic seal 2 is plasma-activated, it is dip-coated with a resin layer to form a semi-interpenetrating network structure. The resin layer is added with a photosensitizer (4-phenylazobenzene, response wavelength range 280 - 500 nm) and a plasticizer (dioctyl phthalate, enhancing flexibility in low light) to form an ultraviolet curable resin layer. Under normal conditions, the resin layer is in a flexible state, allowing the elastic seal 2 to deform.

[0129] The extrusion chamber 31 is provided with an elliptical light-transmitting window 311. The light-transmitting window 311 is covered with quartz glass. An array of prisms is provided inside the window 311 to focus ambient light onto the resin layer, doubling the light intensity.

[0130] The specific working process is as follows:

[0131] In an outdoor strong light scenario (≥100,000 lux, containing ultraviolet components), ambient light passes through the window 311 to focus ultraviolet rays and irradiate the resin layer. The resin layer hardens, and the elastic seal 2 locks the gas flow channel to prevent the intrusion of high temperature or poisonous gas.

[0132] In a mine / indoor low light scenario (≤10,000 lux, without ultraviolet), the resin layer remains flexible, allowing the elastic seal 2 to be squeezed and the air flow to pass through.

[0133] After the operation is completed, the hardened resin layer is scraped off or erased by ultraviolet light (irradiated with a 254 nm lamp for 10 minutes). The elastic seal 2 can then restore its performance, complete the reset, be reused, and has a low maintenance cost.

[0134] In summary, this embodiment is applicable to dangerous environments with variable lighting conditions such as fire protection, mines, and chemical industries. It breaks through the limitations of the active control of traditional valves with "passive light control" and has both high reliability and low cost.

[0135] At the same time, when the user is operating in a polluted environment, to prevent the elastic seal 2 from deflating the airbag due to accidental touch, a strong light flashlight that can emit ultraviolet light can be carried with them. The ultraviolet component is used to trigger the rapid curing of the resin, thereby enhancing the stability of the elastic seal 2 and improving the check valve effect of the air nozzle.

[0136] Embodiment 5

[0137] Reference Figure 9 and Figure 10 The difference between Embodiment 5 and Embodiment 1 of this application is that:

[0138] The elastic seal 2 is made of a high-temperature resistant silicone rubber ring. At the joint between the silicone rubber ring and the air guide column 121, additional thermally expandable microspheres (expansion temperature 80 °C) are provided. The doping ratio of the microspheres is 20 wt%, and they are evenly dispersed in the silicone rubber substrate to form a thermally sensitive sealing film 25. When the temperature continues to be high, the sealing film forms pressure relief micropores.

[0139] The sealing film is formed by the cast film method, the air guide grid is laser engraved on the surface, and it is cured by secondary vulcanization to ensure the bonding strength between the microspheres and the substrate.

[0140] The specific working process is:

[0141] In high temperature scenarios (such as when the temperature reaches 80℃±2℃), the microspheres of the sealing film expand, the silicone ring forms micropores, and the airbag releases pressure, reducing the risk of airbag bursting due to high temperature. The diameter of the micropores expands linearly with the increase in temperature to adapt to different overheating scenarios, breaking through the fixed threshold limit of traditional mechanical one-way valves, and dynamically adapting to high temperature scenarios of 80~150℃. It is especially suitable for extreme high temperature scenarios such as firefighting, metallurgy, and chemical industry, and solves the problem of thermal failure of traditional airbag masks with "zero power self-adaptation".

[0142] At normal temperature (temperature drops below 50°C), the microspheres shrink, the micropores of the silicone ring close, the silicone ring regains its seal, and the airbag leakage rate returns to normal.

[0143] Example 6

[0144] refer to Figure 2 and Figure 11 , the difference between Example 6 of the present application and Example 1 is that:

[0145] The elastic sealing member 2 is a rubber ring made of a shape memory polymer (SMP), and the glass transition temperature (Tg) of the SMP is set to 25-35°C, specifically set to be close to the human body surface temperature range, about 32-35°C.

[0146] When squeezing the elastic seal 2, the human finger contacts the valve sleeve 3 (temperature rises above Tg), and the valve sleeve 3 transfers the human body heat to the SMP rubber ring, which can trigger the softening of the SMP rubber ring. Without relying on active heating, the extrusion flexibility of the elastic seal 2 can be improved, thereby achieving rapid inflation and deflation. At the same time, the softened SMP further fits the inner wall of the valve sleeve 3, achieving dynamic sealing enhancement.

[0147] After the hand leaves the valve sleeve 3, the rubber ring loses heat (the temperature drops below Tg) while returning to its original position, thereby hardening again to ensure the sealing of the check air nozzle valve.

[0148] At the same time, four groups of heat-conducting ribs 32 are arranged on the surface of the valve sleeve 3 corresponding to the finger pressing position. The heat-conducting ribs 32 are in the shape of long sheets and protrude from the surface of the valve sleeve 3, thereby increasing the contact area between the human finger and the heat-conducting ribs 32, making it easier for the human finger to press. The heat-conducting ribs 32 are made of copper-based composite materials to improve thermal conductivity and accelerate heat transfer when the human body squeezes the elastic seal 2.

[0149] The four groups of heat-conducting convex ribs 32 are all located on the outer surface of the extrusion cavity 31, and the four groups of heat-conducting convex ribs 32 are evenly arranged in the circumferential direction around the extrusion cavity 31. Through the four groups of arranged heat-conducting convex ribs 32, when a human finger presses the extrusion cavity 31 from various angles, it can contact the heat-conducting convex ribs 32, thereby accelerating the heat transfer efficiency during human contact.

[0150] In a low-temperature (<Tg) working environment, by utilizing the pre-compressive deformation of the SMP in its rigid state, the SMP rubber ring hardens to provide basic sealing. At the same time, in the past, during low-temperature operations, due to the hardening of the elastic seal 2, the elastic seal 2 was easily damaged due to cold brittleness when being extruded, resulting in a reduction in sealing performance. Now, however, the body temperature triggers the softening of the elastic seal 2, which not only improves the operation flexibility but also reduces the probability of damage to the elastic seal 2.

[0151] In addition, the SMP rubber ring can utilize the wide-temperature-range gradual change characteristic of SMP, such as gradient cross-linked SMP materials, to enable it to maintain a progressive deformation ability within the range of 15 - 40°C, avoiding seal failure caused by small fluctuations in the ambient temperature.

[0152] Embodiment 7

[0153] Reference Figure 12 and Figure 13 The difference between Embodiment 7 of the present application and Embodiment 1 lies in:

[0154] The elastic seal 2 is embedded with a nitinol memory alloy drive wire 261 and a PVDF piezoelectric thin film layer 262. The diameter of the nitinol memory alloy wire is 0.1 mm, and after gradient annealing treatment, its lifespan is increased. The nitinol memory alloy wire is wound around the surface of the air guide column 121 with a spiral pitch of 0.5 mm, and the end is welded to the electrode of the PVDF piezoelectric thin film layer 262, forming a closed circuit in electrical connection with the PVDF piezoelectric thin film layer 262. The phase change temperature of the nitinol memory alloy wire matches the temperature of the gas exhaled by the human body (the phase change temperature in this embodiment is 36°C), and the elastic seal 2 integrally wraps the nitinol memory alloy drive wire 261 and the PVDF piezoelectric thin film layer 262.

[0155] An arc-shaped voltage-sensitive groove 312 is provided on the inner wall of the extrusion cavity 31. By matching the curvature radius of the PVDF piezoelectric thin film layer 262, when the blowing air flow impacts the PVDF piezoelectric thin film layer 262, the blowing pressure is converted into an effective deformation load, generating an instantaneous voltage to drive the resistance heating of the nitinol memory alloy drive wire 261 to reach the phase change temperature, causing the spiral layout of the nitinol memory alloy drive wire 261 to generate an axial contraction force, forcing the ellipticity of the elastic seal 2 to increase.

[0156] Meanwhile, 27 groups of micro heat dissipation fins are arranged both inside and outside the elastic seal 2. One group of micro heat dissipation fins 27 is arranged at the ridge part of the arc-shaped conductive voltage-sensitive groove 312, forming an interleaved laminate with the PVDF piezoelectric film, and the heat is exported through forced convection.

[0157] Another group of micro heat dissipation fins 27 is arranged on the periphery of the winding area of the nitinol shape memory alloy drive wire 261. The heat dissipation fins are in close contact with the nitinol shape memory alloy drive wire 261, quickly reducing the working temperature of the nitinol shape memory alloy drive wire 261 to below the phase transition temperature, accelerating the reset speed of the elastic seal 2, and avoiding the thermal aging of the elastic seal 2.

[0158] The PVDF piezoelectric film layer 262 uses a polarized film with a thickness of 50 μm. The nano encapsulation process is adopted, and the moisture and corrosion resistance are improved to adapt to complex working conditions. The PVDF piezoelectric film layer 262 is axially divided into 3 groups along the air guide column 121, and each group covers a 120° arc surface of the air guide column 121. The surface of the PVDF piezoelectric film layer 262 is coated with a polyimide insulating layer.

[0159] During the blowing process of the user, when the blowing pressure > 0.3 kPa, the air flow impacts the PVDF piezoelectric film layer 262, generating a pulse voltage of 6 - 8V. At the same time, through the dual energy input of human body temperature conduction, the nitinol shape memory alloy drive wire 261 is heated to the phase transition temperature in a very short time, generating an axial tensile force, causing the elastic seal 2 to deform. Thus, a pressure-temperature double-trigger mechanism is realized, which not only ensures quick opening during blowing but also enhances the seal during contact, avoiding the risk of accidental opening.

[0160] The spiral layout of the nitinol shape memory alloy drive wire 261 generates an axial contraction force, which, combined with the voltage feedback of the PVDF piezoelectric film, enables the ellipticity deformation of the elastic seal 2 to be dynamically adjusted according to the blowing intensity, greatly improving the air flow control accuracy.

[0161] After stopping blowing, the PVDF piezoelectric film layer 262 is powered off, and the nitinol shape memory alloy drive wire 261 can be cooled to below the phase transition temperature in a short time through the heat dissipation fins, and the elastic seal 2 returns to its original state.

[0162] When the temperature > 40°C, the over-limit contraction of the shape memory alloy triggers the rigid locking of the elastic seal 2; when the temperature < 32°C, the PVDF piezoelectric film has open-circuit protection, and the system automatically resets to the sealed state, realizing a temperature-voltage double-insurance mechanism.

[0163] Embodiment 8

[0164] Reference Figure 14 In this regard, the difference between Embodiment 8 and Embodiment 1 of this application is that:

[0165] The air nozzle valve further includes a supplementary air chamber 4. The supplementary air chamber 4 is a flexible chamber body, which is formed by molding medical-grade silica gel. The bottom of the supplementary air chamber 4 is connected to the one-way air inlet nozzle 111 through a threaded interface.

[0166] When the inflation degree of the airbag is not sufficient to closely fit the face, and the user is in an environment where it is not convenient to remove the mask for supplementary air, the user can squeeze the elastic seal 2 and at the same time squeeze the supplementary air chamber 4 for supplementary air, improving the convenience and safety of use.

[0167] At the same time, the setting of the supplementary air chamber 4 can also directly protect the air inlet nozzle 111, preventing the air inlet nozzle 111 from being directly exposed to the air and being contaminated.

[0168] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of the present application. That is to say, the above-described multiple embodiments can also be arbitrarily combined according to actual needs.

[0169] It should be noted that all the above drawings are exemplary illustrations of the present application and do not represent the actual size of the product. Also, the dimensional ratio relationship between the components in the drawings does not limit the actual product of the present application either.

[0170] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited thereby. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A check air nozzle valve, characterized in that, Comprising: A valve core (1), including a ventilation part (11) and a gas guiding part (12). The ventilation part (11) is of a hollow columnar and through-type design. One end of the ventilation part (11) is provided as an air inlet nozzle (111), and the other end is provided as an air outlet (112). One end of the gas guiding part (12) is provided as a sealed gas guiding column (121). The gas guiding column (121) extends into the air outlet (112) and is connected to the air outlet (112). A gap for air flow to pass through is left between the gas guiding column (121) and the air outlet (112). A plurality of groups of gas guiding channels (113) extending along the axial direction of the air outlet (112) to the end of the air outlet (112) are provided on the inner wall of the air outlet (112). An elastic seal (2). The elastic seal (2) is sleeved outside the gas guiding column (121) and fits with the end of the air outlet (112). When the elastic seal (2) is in its original state, the elastic seal (2) can cover the ends of all the gas guiding channels (113). When the elastic seal (2) is squeezed and deformed, the elastic seal (2) can open the ends of some of the gas guiding channels (113). A valve sleeve (3). The valve sleeve (3) is of a hollow columnar, through-type and elastic design. The valve sleeve (3) is in interference fit with the valve core (1). One end of the valve sleeve (3) is sleeved outside the valve core (1) and hermetically covers the butt joint of the air outlet (112) and the gas guiding column (121). The other end of the valve sleeve (3) is used to communicate with an inflatable object. A squeezing cavity (31) is provided in the middle of the valve sleeve (3) to ensure that when the valve sleeve (3) is sleeved outside the valve core (1), the elastic seal (2) can still be in its original state. The squeezing cavity (31) is in contact with the elastic seal (2).

2. The check air nozzle valve according to claim 1, characterized in that: The elastic seal (2) is a three-layer gradient hardness silica gel ring, which consists of an inner layer (21), a middle layer (22) and an outer layer (23) from the inside to the outside, and the outer layer (23) has the greatest hardness. A plurality of groups of circumferentially offset wedge-shaped notches (24) are respectively provided on the surfaces of the inner layer (21), the middle layer (22) and the outer layer (23). The notches (24) of each layer are staggered in the circumferential direction. A spiral guide groove (122) is provided on the outer wall of the gas guiding column (121). When the elastic seal (2) is compressed and deformed, the notches (24) and the guide groove cooperate to form a spiral air inlet channel.

3. The check air nozzle valve according to claim 1, wherein: The outer surface of the squeezing cavity (31) is coated with an ultraviolet light-curing resin layer. Under normal conditions, the resin layer is in a flexible state and allows the squeezing cavity (31) to deform. When ambient light irradiates the resin layer, the following response is triggered. In a strong light environment, the light intensity ≥ 100,000 lux, containing ultraviolet components, the resin layer hardens, the squeezing chamber loses its deformation performance, and the elastic seal (2) locks the gas flow channel. In a weak light environment, the light intensity ≤ 10,000 lux, without ultraviolet, the resin layer remains flexible, the squeezing chamber restores its deformation performance, allowing the elastic seal (2) to be squeezed and the air flow to pass through.

4. The check air nozzle valve according to claim 1, wherein: A heat-sensitive sealing film (25) is provided at the joint between the elastic seal (2) and the gas guiding column (121). When the temperature remains high, the sealing film forms pressure relief micropores.

5. The check air nozzle valve according to claim 1, characterized in that: The elastic seal (2) is made of a shape memory polymer SMP, and its glass transition temperature Tg is set to 25 - 35 °C; The surface of the valve sleeve (3) is provided with heat-conducting ribs (32) for accelerating heat transfer when the human body squeezes the elastic seal (2).

6. The check air nozzle valve according to claim 1, characterized in that: The elastic seal (2) is embedded with a nickel-titanium memory alloy drive wire (261) and a PVDF piezoelectric film layer (262). The nickel-titanium memory alloy drive wire (261) is helically wrapped around the circumferential direction of the air guide column (121), and its phase transition temperature matches the temperature of the gas exhaled by the human body and is electrically connected to the PVDF piezoelectric film layer (262) to form a closed circuit; The inner wall of the extrusion cavity (31) is provided with an arc-shaped voltage-sensitive groove (312). When the blowing air flow impacts the PVDF piezoelectric film layer (262), an instantaneous voltage is generated to drive the resistance heating of the nickel-titanium memory alloy drive wire (261), causing the alloy wire to contract and generate an axial tensile force, forcing the ellipticity of the elastic seal (2) to increase.

7. The check air nozzle valve according to any one of claims 1-6, characterized in that: The ventilation part (11) is provided with a limiting member (114) for limiting the position of the valve sleeve (3) at a position close to the air inlet nozzle (111).

8. The check air nozzle valve according to any one of claims 1-6, characterized in that: The air guide part (12) is provided with multiple sets of supporting members (123) for further supporting the valve sleeve (3) at one end far from the air guide column (121).

9. The check air nozzle valve according to any one of claims 1-6, characterized in that: The air guide part (12) is provided with multiple sets of air distribution channels (124) extending axially along the air guide part (12) to the air guide column (121) at one end far from the air guide column (121). The number of the air distribution channels (124) is an integer multiple of the number of the air guide channels (113) to shunt the gas led out by the air guide channels (113).

10. The check air nozzle valve according to any one of claims 1-6, characterized in that: It further includes a supplementary air chamber (4) detachably connected to the air inlet nozzle (111), and the supplementary air chamber (4) is a flexible chamber body.

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