Microporous ventilated noise-cancelling earplug

Abstract

Disclosed is a microporous ventilated noise-cancelling earplug, comprising an earplug sleeve and an earplug main body. An accommodating cavity is provided in the earplug sleeve, the earplug main body is detachably mounted in the accommodating cavity, and the earplug main body comprises a support base and a microporous quartz plate mounted in the support base. The interior of the support base is hollow, ventilation holes are provided in an outer wall of the support base, a plurality of micron-scale micropores are densely distributed in the microporous quartz plate, and the interior of the ear canal of a wearer is in communication with an external airflow by means of the ventilation holes, the micropores, and the accommodating cavity. Thus, by means of combining the support base and the microporous plate to form the earplug main body and the earplug main body being detachably fitted to the earplug sleeve to form the earplug, a user can select, on the basis of needs, earplug main bodies having different numbers of microporous plates to be combined with the earplug sleeve, thereby meeting noise cancellation requirements in different environments. In addition, the microporous plate used in the earplug is made of a quartz material and has a large number of uniformly distributed micropores having a small pore size, such that the earplug enables quick ventilation to balance the pressure inside and outside the ear canal and achieves the effect of wideband noise cancellation.

Description

Microporous ventilated noise reduction earplugs Technical Field

[0001] The present invention relates to the field of sound attenuation and noise reduction technology, in particular to a microporous ventilation type noise reduction earplug. Background Art

[0002] In recent years, urban noise has become increasingly severe, disturbing people's work and life at all times. The negative impact of urban noise on people, in addition to affecting the efficiency of work and study, can also damage the ear canal and hearing health, and even endanger physical and mental health. For this reason, people often choose to use noise-canceling earplugs to avoid the harm of urban noise. However, existing noise-canceling earplugs are mostly made of solid silicone or low-pressure foam. After being inserted into the ear canal, they form a closed space in the ear canal to achieve the purpose of isolating noise. When worn, they seal the air in the ear canal, which will cause a certain pressure difference between the inside and outside of the eardrum, resulting in a sense of oppression and pain in the ears when worn for a long time. In severe cases, it can also cause dizziness and nausea in the human body. To solve this problem, noise-canceling earplugs using breathable microporous films and other microporous structures have appeared on the market, such as ZL202222533706.7. However, these earplugs have the following drawbacks: Earplugs that use breathable microporous films for noise reduction have very thin membranes, resulting in limited noise reduction. Earplugs that use ceramic microporous structures for noise reduction, because ceramic materials are porous sound-absorbing materials with both open and closed pores, require sound to pass through these interconnected microporous channels to be dissipated, similar to the noise reduction principle of traditional porous sound-absorbing materials such as sound-absorbing sponges. To achieve effective noise reduction, the ceramic microporous material must be made thicker to achieve good sound absorption and dissipation. Furthermore, because the micropores within the ceramic are not straight-through holes, the ventilation performance is lower than that of straight-through holes of the same pore diameter and thickness, which is detrimental to wearing comfort and ear canal health.

[0003] Therefore, there is an urgent need for a noise-reducing earplug that has a comfortable temperature in the ear canal when worn, no stuffiness, good clamping properties, good noise reduction effect, and a long service life to address the defects of existing earplugs.

[0004] Summary of the Invention

[0005] In view of this, the present invention addresses the deficiencies in the prior art, and its main purpose is to provide a microporous ventilated noise reduction earplug, which forms an earplug body by combining a support base with a microporous plate. The earplug body and the earplug sleeve are detachably matched to form the earplug. Users can choose to combine earplug bodies and earplug sleeves with different numbers of microporous plates according to their needs to meet the noise reduction needs in different environments.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A microporous ventilated noise-reducing earplug, comprising an earplug sleeve and an earplug body, wherein the earplug sleeve has a receiving cavity, the receiving cavity being connected front to back, and the earplug body being detachably mounted in the receiving cavity of the earplug sleeve; the earplug body comprising a support seat and a quartz microporous plate mounted in the support seat, the support seat being hollow inside and having vents provided on its outer wall, the quartz microporous plate being densely covered with a plurality of micron-sized micropores, so that the airflow inside the wearer's ear canal and the external airflow are interconnected through the vents, micropores and receiving cavity.

[0008] As a preferred solution: the pore size of the microporous plate is 1 μm-10 μm; the porosity is 1%-50%; and the thickness of the microporous plate is 1 mm-5 mm.

[0009] As a preferred solution: the noise reduction frequency range is 60Hz-8000Hz.

[0010] As a preferred solution: the support seat includes a receiving portion for accommodating the microporous plate and a connecting portion for cooperating and fixing with the earplug sleeve, the receiving portion has a cavity, the microporous plate is installed in the cavity, and a sealing cover is provided at the opening of the cavity in an interference fit manner; there are multiple vents, and the multiple vents are arranged on the outer wall of the cavity at intervals around the receiving portion, and are connected to the cavity, and are located above the microporous plate; the connecting portion is elastically clamped with the earplug sleeve, and the connecting portion has an airway connected to the cavity.

[0011] As a preferred solution: a plurality of recesses are arranged at intervals around the outer wall of the cavity, and the vent hole is provided at the bottom of each recess.

[0012] As a preferred solution: the connecting portion of the support seat has an annular embedding groove, and an annular embedding block is provided on the inner wall of the accommodating cavity of the earplug sleeve corresponding to the annular embedding groove, and the annular embedding block can be detachably clamped in the annular embedding groove.

[0013] As a preferred solution: an annular step is provided in the cavity, and the microporous plate is tightly fitted on the annular step; and a funnel-shaped transition channel is provided at the bottom of the cavity corresponding to the area where the micropores are distributed on the microporous plate.

[0014] As a preferred solution: one or multiple microporous plates are installed in the support seat.

[0015] As a preferred solution: the outer wall of the accommodating portion is conical, and the upper part of the accommodating cavity is also conical, which matches the outer wall of the accommodating portion; the lower end of the earplug sleeve has a trumpet-shaped air outlet connected to the accommodating cavity.

[0016] As a preferred solution: the earplug sleeve includes an outer sleeve and an inner sleeve integrally arranged in the outer sleeve, the accommodating cavity is located in the inner sleeve, an arc-shaped earplug handle is integrally extended outward from the upper edge of the inner sleeve, and a round head is provided at the outward end of the arc-shaped earplug handle.

[0017] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that the earplug body is formed by combining the support base with the microporous plate, and the earplug body and the earplug cover are detachably matched to form the earplug. Users can choose to combine earplug bodies and earplug covers with different numbers of microporous plates according to their needs to meet the noise reduction needs in different environments; in addition, the microporous plate used in the earplug is made of quartz material, with a large number of micropores, small micropore diameter, and uniform distribution, so that the earplug can quickly ventilate and balance the pressure inside and outside the ear canal, and has a broadband noise reduction effect, making the wearer feel more comfortable. At the same time, it can adapt to the noise reduction needs under different noise frequencies.

[0018] To more clearly illustrate the structural features and effects of the present invention, it is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of the three-dimensional structure of the earplug of the present invention;

[0020] FIG2 is a schematic diagram of the three-dimensional structure of the earplug of the present invention from another perspective;

[0021] FIG3 is a schematic cross-sectional view of the earplug of the present invention;

[0022] FIG4 is an exploded perspective view of the earplug of the present invention;

[0023] FIG5 is an exploded perspective view of the earplug of the present invention from another perspective;

[0024] FIG6 is a schematic diagram of the three-dimensional structure of the support base of the present invention;

[0025] FIG7 is a schematic cross-sectional view of the microplate of the present invention;

[0026] FIG8 is a schematic diagram showing the relative relationship between aperture and sound absorption performance of the present invention;

[0027] FIG9 is a schematic diagram showing the relative relationship between porosity and sound absorption performance of the present invention;

[0028] FIG10 is a schematic diagram showing the relative relationship between hole depth and sound absorption performance of the present invention;

[0029] FIG11 is a schematic diagram showing the relationship between porosity and the balance time of ventilation pressure inside and outside the earplug according to the present invention;

[0030] FIG12 is a schematic diagram showing the relationship between the hole depth and the time for balancing the ventilation pressure inside and outside the earplug according to the present invention;

[0031] FIG13 is a comparative diagram of sound pressure reduction according to the present invention;

[0032] FIG14 is a schematic diagram of the noise reduction curve of the present invention when the pore diameter is 4 μm, the pore depth is 1.5 μm, and the porosity is 0.3.

[0033] Explanation of the accompanying symbols: 10. Earplug sleeve; 11. Outer sleeve; 12. Inner sleeve; 13. Accommodation cavity; 14. Arc-shaped earplug handle; 15. Round head; 16. Air port; 17. Annular embedding block; 20. Earplug body; 21. Support seat; 211. Accommodation portion; 212. Connecting portion; 2121. Airway; 2122. Annular embedding groove; 213. Cavity; 214. Annular step; 215. Transition channel; 216. Cover; 2161. Cover body; 2162. Embedding portion; 2163. Longitudinal opening; 217. Vent; 218. Recess; 22. Microporous plate; 221. Micropore. DETAILED DESCRIPTION

[0034] As shown in FIG1 to FIG14 , the present invention provides a microporous ventilated noise reduction earplug, comprising an earplug sleeve 10 and an earplug body 20, wherein:

[0035] The earplug sleeve 10 is made of silicone and includes an outer sleeve 11 and an inner sleeve 12 integrally mounted within the outer sleeve 11. The inner sleeve 12 defines a receiving cavity 13. An arcuate handle 14 extends outward from the upper edge of the inner sleeve 12, with a rounded tip 15 at the end. This arcuate handle 14 facilitates removal of the earplug from the wearer's ear. The upper portion of the receiving cavity 13 is tapered to form a seal with the outer wall of the earplug body 20. The lower end of the earplug sleeve 10 features a trumpet-shaped air vent 16 that communicates with the receiving cavity 13, ensuring interconnectedness between the upper and lower ends of the cavity 13.

[0036] The earplug body 20 is detachably mounted in the accommodating cavity 13 of the earplug sleeve 10. The earplug body 20 includes a support seat 21 (made of plastic) and a quartz microporous plate 22 mounted in the support seat 21. The support seat 21 is hollow inside and includes a receiving portion 211 for receiving the microporous plate 22 and a connecting portion 212 for cooperating and fixing with the earplug sleeve 10. The outer wall of the receiving portion 211 is conical and matches the accommodating cavity 13. The receiving portion 211 has a cavity 213, and the microporous plate 22 is mounted in the cavity 213. The microporous plate 22 is densely covered with a plurality of micron-sized micropores. The microporous plate 22 is tightly connected to the inner wall of the cavity 213. Specifically, an annular step 214 is provided in the cavity 213, and the microporous plate 22 is tightly fitted on the annular step 214 to ensure a sealed fit between the microporous plate 22 and the annular step 214, without any gap, to prevent sound from entering the wearer's ear canal through the gap; and a funnel-shaped transition channel 215 is provided at the bottom of the cavity 213 corresponding to the area where the micropores are distributed on the microporous plate 22. The funnel-shaped structure is used to ensure that the noise passing through the micropores is in full contact with the inclined inner wall of the transition channel 215, thereby expanding the contact area with the wall when the noise enters and improving the noise conversion efficiency (the friction between the sound wave and the wall generates heat, which is converted into heat and dissipated, thereby achieving a noise reduction effect). In addition, to further enhance the noise reduction effect, the volume of the cavity 213 can be expanded longitudinally so that the cavity 213 can accommodate the stacking of multiple microporous plates 22. The stacking of multiple microporous plates 22 is equivalent to increasing the depth of the micropores, which can effectively enhance the noise reduction effect. The combination of multiple microporous plates 22 to form multiple filters can minimize noise. When multiple microporous plates 22 are stacked and installed, the microporous plates 22 can be distinguished by using different colors. In actual production, a support base 21 is designed to accommodate one or more microporous plates 22, forming multiple types of earplug bodies 20. The wearer can choose an earplug body 20 with a single microporous plate 22 or an earplug body 20 with multiple microporous plates 22 in combination with an earplug sleeve 10, depending on the noise level of the surrounding environment, thereby meeting different usage requirements.

[0037] A cover 216 is detachably provided at the opening of the cavity 213 (the cover 216 can also be fixedly connected or hot-melt-connected to the opening of the cavity 213) to block the opening of the cavity 213 and prevent noise from directly entering the ear canal through the opening of the cavity 213. Specifically, the cover 216 and the opening of the cavity 213 are fitted with an interference fit to achieve the effect of completely sealing the opening of the cavity 213. The cover 216 includes a cover body 2161 and an embedded portion 2162 integrally provided at the lower end of the cover body 2161. The embedded portion 2162 is detachably inserted into the inner side of the opening of the cavity 213, and the cover body 2161 covers the opening of the cavity 213. A longitudinal opening 2163 is longitudinally cut on the embedded portion 2162 for elastically fitting the embedded portion 2162 with the inner wall of the opening of the cavity 213 so that the cover 216 can be removed from the opening of the cavity 213. Multiple recesses 218 are arranged at intervals around the outer wall of cavity 213 (the inner walls of recesses 218 are curved, which not only slows down the flow of air but also increases the contact area between the noisy airflow and the outer wall of vent 217, allowing more noise to be converted into heat and dissipated). A vent 217 is provided at the bottom of each recess 218. Vent 217 communicates with cavity 213 and is located above quartz microporous plate 22 to ensure that any noise entering through vent 217 passes through quartz microporous plate 22. The airflow inside the wearer's ear canal communicates with the outside airflow through the side vents 217, micropores 221, and accommodating chamber 13. This allows the air pressure inside and outside the wearer's ear canal to be quickly equalized, preventing a pressure difference between the inside and outside of the ear canal and making wearing the earplug more comfortable. The sound is turned from the side vent 217 and enters the ear canal after being reduced in noise through the micropores 221, which can prevent the noise from directly entering the ear canal, weaken the impact of the noise on the ear canal, and reduce the noise decibel.

[0038] The connecting portion 212 is elastically engaged with the earplug sleeve 10, and an air passage 2121 is formed in the connecting portion 212. The upper end of the air passage 2121 is connected to the transition channel 215 of the cavity 213, and the lower end is connected to the trumpet-shaped air outlet 16 of the earplug sleeve 10. An annular embedding groove 2122 is provided on the connecting portion 212, and an annular embedding block 17 is provided on the inner wall of the accommodating cavity 13 of the earplug sleeve 10 corresponding to the annular embedding groove 2122. The annular embedding block 17 is detachably elastically engaged with the annular embedding groove 2122, so that the support seat 21 and the earplug sleeve 10 form a mating connection.

[0039] The microporous plate 22 is made of quartz material, and the pore size, number, and distribution are all quantifiable, which has a positive effect on reducing noise, expanding the noise reduction frequency range, and achieving broadband noise reduction. The shape of the microporous plate 22 can be designed to be cylindrical, cubic, or other shapes according to actual conditions. The specific parameters of the microporous plate 22 are as follows:

[0040] 1. The pore size of the micropore is 1 μm-10 μm. In this embodiment, the pore size of the micropore 221 is 4 μm.

[0041] 2. The number of micropores 221 is 100,000 (the specific number can be set according to actual conditions), and the distribution of the micropores 221 adopts a honeycomb pattern or other distribution patterns;

[0042] 3. The porosity of the micropores (the ratio of the distribution area of ​​the micropores 221 to the cross-sectional area of ​​the microporous plate 22) is 1%-50%. In this embodiment, the porosity is 30%;

[0043] 4. The thickness of the microporous plate 22 is 1 mm to 5 mm. In this embodiment, the thickness of the microporous plate 22 is 1 mm to 1.5 mm. Reducing the thickness of the microporous plate 22 can effectively reduce the production cost of the earplug. When a thicker microporous plate 22 is required, multiple microporous plates 22 can be stacked to increase the overall thickness.

[0044] 5. The microporous plate 22 can reduce noise in the frequency range of 60Hz-8000Hz, achieving simultaneous noise reduction of low-frequency and high-frequency noise.

[0045] It should be noted that during actual operation, the above parameters can be adjusted so that the earplugs only reduce noise in a certain frequency band, while allowing other sounds to enter the ears normally.

[0046] The microplate has the following effects:

[0047] First, the small aperture and large number of micropores can reduce noise in the low-frequency and high-frequency bands, and have a broadband noise reduction effect.

[0048] Second, the large number of micropores and high porosity can improve the breathability of the earplugs, so that after the wearer puts on the earplugs, the internal and external pressures of the ear canal can quickly reach equilibrium. After testing, the microporous plate can achieve internal and external pressure balance within 1.6 seconds, thereby quickly reducing the internal pressure of the ear canal caused by the earplug entering the ear canal, avoiding dizziness, headaches and other discomfort symptoms caused by wearing traditional earplugs (the porosity of traditional earplugs is 1%) for a long time, and improving the comfort of wearing the earplugs.

[0049] Third, the earplug has a high sound absorption rate and can achieve a linear noise reduction effect.

[0050] The test data of earplug noise reduction is as follows:

[0051] 1. Earplug noise reduction test parameter settings

[0052] The pore size d of the microplate, in mm

[0053] The hole depth h of the microplate, in mm

[0054] Porosity t, unitless

[0055] The diameter of the ear canal D is 6.5 mm.

[0056] The depth H of the cavity between the microporous plate and the tympanic membrane is 26 mm.

[0057] 2. Purpose of the Test

[0058] The effects of multiple parameters such as the pore size, pore depth, and porosity of the microporous plate on the performance of the noise-canceling earplugs were determined, and the specific parameters of the microporous plate in the specific implementation method were verified to be the optimal design parameters of the noise-canceling earplugs.

[0059] Traditional earplugs generally have weaker blocking effects on low-frequency sounds. Therefore, in the test, the main judgment basis is the blocking effect of low-frequency sounds, that is, attenuation of not less than 25dB at a frequency of 60Hz. It is believed that the parameters of the microporous plate meet the requirements of earplug noise reduction, so that within the sound frequency band of 60Hz-8000Hz, there is attenuation of not less than 25dB at low frequencies and not less than 35dB at high frequencies.

[0060] 3. The influence of aperture on sound absorption performance

[0061] Aperture scanning range: 0.001mm-0.01mm

[0062] Scanning conditions: Hole depth: 2mm Ear canal diameter: 6.5mm Cavity: 26mm Porosity: 0.5

[0063] Conclusion: As the aperture decreases, the sound absorption performance is significantly improved. When the aperture is no more than 5 μm, the noise reduction performance of the earplug meets the requirements. Considering the manufacturing difficulty and safety factor, the aperture is set to 4 μm, as shown in Figure 8.

[0064] 4. The influence of porosity on sound absorption performance

[0065] Porosity scanning range: 0.1-0.9

[0066] Scanning conditions: Aperture: 0.004mm Aperture depth: 2mm Ear canal diameter: 6.5mm Cavity: 26mm

[0067] Conclusion: The lower the porosity, the better the noise reduction effect of the earplug. Among them, when the porosity is 0.3, the noise reduction effect of the earplug meets the requirements, as shown in Figure 9.

[0068] 5. The influence of hole depth on sound absorption performance

[0069] 1. Hole depth scanning range: 0.5mm-1.5mm

[0070] Scanning conditions: Aperture: 0.004mm Ear canal diameter: 6.5mm Cavity: 26mm Porosity: 0.3

[0071] Conclusion: The deeper the hole depth, the better the sound absorption effect. When the hole depth is 1.5mm, it meets the noise reduction requirements of earplugs, as shown in Figure 10.

[0072] VI. Relationship between Porosity, Hole Depth, and Ventilation Pressure Equilibrium Time

[0073] 1. Relationship of porosity

[0074] Scanning conditions:

[0075] Aperture: 0.004mm Aperture depth: 2mm Ear canal diameter: 6.5mm Cavity: 26mm

[0076] Conclusion: When the internal and external air pressures are balanced to 99%, the required balancing time gradually becomes longer as the porosity decreases. When the porosity is 0.3, the hole depth is 2mm, and the hole diameter is 4um, it takes 0.4s, as shown in Figure 11.

[0077] 2. Relationship between hole depth and ventilation pressure balance time inside and outside the earplug

[0078] Porosity scanning range: 0.1-0.4

[0079] Scanning conditions: Aperture: 0.004mm Aperture depth: 1mm Ear canal diameter: 6.5mm Cavity: 26mm

[0080] Conclusion: Comparing the ventilation capacity of earplugs with a porosity of 0.3 and a hole depth of 1mm and 2mm, the deeper the hole, the longer the balance time between the inside and outside of the earplug. However, at a hole depth of 2mm, the recovery time of the pressure inside and outside the earplug is much less than 3s. This way, the ears will not be pressurized and uncomfortable. Rapid ventilation inside and outside also allows the ear canal and the outside to breathe, keeping them dry. Long-term wear is not easy to breed bacteria, thus maintaining the health of the ear canal, as shown in Figure 12.

[0081] 7. Sound pressure reduction comparison chart

[0082] It can be seen that most of the sound energy (red part) is consumed on the microporous plate, as shown in Figure 13.

[0083] 8. Summary

[0084] Taking into account the pore size, pore depth, porosity, manufacturing process, and cost, the noise reduction effect when the pore size is 4 μm, the pore depth is 1.5 mm, and the porosity is 0.3 meets the requirements of noise reduction and ventilation of earplugs, as shown in Figure 14.

[0085] The design focus of the present invention is that the support base and the microporous plate are combined to form the earplug body, and the earplug body and the earplug sleeve are detachable and matched to form the earplug. Users can choose to combine earplug bodies and earplug sleeves with different numbers of microporous plates according to their needs to meet the noise reduction needs in different environments; in addition, the microporous plate used in the earplug is made of quartz material, which has a large number of micropores, small diameter, and uniform distribution, so that the earplug can quickly ventilate and balance the pressure inside and outside the ear canal, and has a broadband noise reduction effect, making the wearer feel more comfortable. At the same time, it can adapt to the noise reduction needs under different noise frequencies.

[0086] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A microporous ventilation noise reduction earplug, characterized in that: The invention comprises an earplug sleeve and an earplug body, wherein the earplug sleeve is provided with a receiving cavity, the receiving cavity is connected from front to back, and the earplug body can be detachably installed in the receiving cavity of the earplug sleeve; the earplug body comprises a supporting seat and a quartz microporous plate installed in the supporting seat, the supporting seat is hollow inside and has ventilation holes on its outer wall, the quartz microporous plate is densely covered with a plurality of micron-sized micropores, and the airflow inside the wearer's ear canal and the external airflow are interconnected through the ventilation holes, the micropores and the receiving cavity.

2. The microporous ventilated noise reduction earplug according to claim 1, characterized in that: The pore size of the microporous plate is 1 μm-10 μm; the porosity is 1%-50%; and the thickness of the microporous plate is 1 mm-5 mm.

3. The microporous ventilated noise reduction earplug according to claim 1, characterized in that: The noise reduction frequency range is 60Hz-8000Hz.

4. The microporous ventilated noise reduction earplug according to claim 1, characterized in that: The support seat includes a receiving portion for receiving the microporous plate and a connecting portion for being fixedly matched with the earplug sleeve, the receiving portion has a cavity, the microporous plate is installed in the cavity, and a sealing cover is provided at the opening of the cavity in an interference fit manner; there are multiple vents, and the multiple vents are arranged on the outer wall of the cavity at intervals around the receiving portion, are connected with the cavity, and are located above the microporous plate; the connecting portion is elastically clamped with the earplug sleeve, and the connecting portion has an airway connected with the cavity.

5. The microporous ventilated noise reduction earplug according to claim 4, characterized in that: A plurality of recesses are arranged at intervals on the outer wall of the cavity, and the ventilation hole is arranged at the bottom of each recess.

6. The microporous ventilated noise reduction earplug according to claim 4, characterized in that: The connecting portion of the support seat has an annular embedding groove, and an annular embedding block is arranged on the inner wall of the accommodating cavity of the earplug sleeve corresponding to the annular embedding groove, and the annular embedding block can be detachably clamped in the annular embedding groove.

7. The microporous ventilated noise reduction earplug according to claim 4, characterized in that: An annular step is arranged in the cavity, and the microporous plate is tightly fitted on the annular step; and a funnel-shaped transition channel is arranged at the bottom of the cavity corresponding to the area where the micropores on the microporous plate are distributed.

8. The microporous ventilated noise reduction earplug according to claim 1, characterized in that: The support seat is equipped with one or multiple microporous plates in a stacked manner.

9. The microporous ventilated noise reduction earplug according to claim 4, characterized in that: The outer wall of the accommodating portion is conical, and the upper portion of the accommodating cavity is also conical, which matches the outer wall of the accommodating portion; the lower end of the earplug sleeve has a trumpet-shaped air outlet connected to the accommodating cavity.

10. The microporous ventilated noise reduction earplug according to claim 1, characterized in that: The earplug sleeve comprises an outer sleeve and an inner sleeve integrally arranged in the outer sleeve, the accommodating cavity is located in the inner sleeve, an arc-shaped earplug handle is integrally extended outwardly from the upper edge of the inner sleeve, and a round head is arranged at the outward end of the arc-shaped earplug handle.

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