Noise reduction earplug

Abstract

The invention relates to a noise reduction earplug. The noise reduction earplug comprises an upper shell, a lower shell and an outer shell, the lower shell is arranged in the outer shell, the upper shell and the lower shell are fixedly connected, and the outer wall of the upper shell abuts against the inner wall of the outer shell. The upper shell and the lower shell are closed to form a first silencing cavity, a first sound guide channel and a second sound guide channel, and the bottom of the lower shell and the outer shell are closed to form a second silencing cavity. The first sound guide channel and the second sound guide channel each comprise at least two channel sections, and every two adjacent channel sections are connected to form a corner. The upper shell is provided with an air inlet, the first sound guide channel is communicated with the air inlet and the first silencing cavity, and the second sound guide channel is communicated with the first silencing cavity and the second silencing cavity. An air outlet is formed in the position, below the second noise reduction cavity, of the outer shell, the second noise reduction cavity communicates with the air outlet, and noise reduction damping parts are arranged in the first noise reduction cavity and the second noise reduction cavity correspondingly. According to the invention, external noise can be effectively isolated, and a quieter environment is provided for a wearer.

Description

Technical Field

[0001] The invention relates to a noise reduction earplug. Background Art

[0002] Noise-reducing earplugs are widely used in various occasions where noise interference needs to be reduced, such as factory workshops, construction sites, airports, train stations and other noisy environments. In addition, noise-reducing earplugs can also provide effective help when sleeping, studying or needing to concentrate. Noise-reducing earplugs fit tightly into the external auditory canal to form a relatively closed space, thereby blocking external noise from entering the ear. Summary of the invention

[0003] In order to improve the noise reduction effect and enhance the user experience, the present invention proposes a noise reduction earplug. The technical solution proposed by the present invention is as follows:

[0004] The present invention provides a noise reduction earplug, comprising: an upper shell, a lower shell and an outer shell;

[0005] The lower shell is arranged in the outer shell, the upper shell and the lower shell are fixedly connected, and the outer wall of the upper shell abuts against the inner wall of the outer shell;

[0006] The upper shell and the lower shell are sealed to form a first sound-absorbing cavity, a first sound-guiding channel and a second sound-guiding channel, and the bottom of the lower shell is sealed to the outer shell to form a second sound-absorbing cavity;

[0007] The first sound guide channel and the second sound guide channel each include at least two channel sections, and two adjacent channel sections are connected to form a corner;

[0008] The upper shell is provided with an air inlet at a position corresponding to the first sound guide channel;

[0009] The first sound guide channel is communicated with the air inlet and the first muffler cavity respectively;

[0010] The second sound guide channel is communicated with the first silencing cavity and the second silencing cavity respectively;

[0011] The outer shell is provided with an air outlet at a position below the second silencing cavity, and the second silencing cavity is communicated with the air outlet;

[0012] The first silencing cavity and the second silencing cavity are both provided with silencing damping components.

[0013] In one or some embodiments, the first sound guiding channel and the second sound guiding channel both include a first channel section and a second channel section, and the first channel section and the second channel section are connected to form a corner;

[0014] The first channel section extends along the circumferential direction of the upper shell and the lower shell;

[0015] The second channel section of the first sound guiding channel and the second channel section of the second sound guiding channel are staggered relative to the first sound-absorbing cavity, and the width of the first sound guiding channel is the same as the width of the second sound guiding channel.

[0016] In one or some embodiments, the first sound guiding channel and the second sound guiding channel each include a plurality of third channel segments and a plurality of fourth channel segments, and the third channel segments and the fourth channel segments are alternately connected and form a corner;

[0017] The third channel section extends along the circumferential direction of the upper shell and the lower shell, and the fourth channel section of the first sound guiding channel and the fourth channel section of the second sound guiding channel are staggered relative to the first silencer cavity.

[0018] In one or some embodiments, the earplug further includes a tuning mesh, and the tuning mesh is disposed on the top of the second sound-absorbing cavity.

[0019] In one or some embodiments, a positioning hole is provided on the lower shell, and a positioning column is provided on a side of the upper shell facing the lower shell, and the positioning column can be accommodated in the positioning hole.

[0020] In one or some embodiments, the earplug further includes an ear cap, which is disposed at the rear end of the outer shell and is detachably connected to the outer shell.

[0021] In one or some embodiments, the upper shell and the lower shell are ultrasonically welded to form a closed cavity.

[0022] In one or some embodiments, the second silencer cavity is disposed near the rear end of the outer shell and below the exit end of the second sound guide channel.

[0023] In one or some embodiments, the sound-absorbing and damping component is made of EVA material.

[0024] In one or some embodiments, the outer shell is made of silicone, and the upper shell and the lower shell are made of hard rubber.

[0025] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows:

[0026] The noise reduction earplug provided by the present invention increases the complexity of the sound propagation path through the at least two channel sections included in the first sound guide channel and the second sound guide channel and the corners between adjacent channel sections, so that the noise undergoes multiple reflections and energy dissipation when passing through the channel, thereby improving the noise reduction effect. This kind of sound guide channel, combined with the built-in first silencer cavity and silencer damping element, has a damping and high-frequency silencing effect on the incoming sound waves. At the same time, a second silencer cavity is externally arranged at the air outlet position, and a silencer damping element is filled in the second silencer cavity, which can further eliminate low-frequency waves in the sound waves, improve the noise reduction effect, and thus improve the user experience.

[0027] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 is a schematic structural diagram of a noise reduction earplug provided by an embodiment of the present invention;

[0031] Figure 2a is a top view of a double-muffler noise reduction earplug provided by an embodiment of the present invention;

[0032] Figure 2b yes Figure 2a AA section view;

[0033] Figure 3a is a schematic structural diagram of an upper housing provided by an embodiment of the present invention;

[0034] Figure 3b is a schematic structural diagram of a lower housing provided by an embodiment of the present invention;

[0035] Figure 4a is a schematic structural diagram of a lower housing having a first sound guide channel provided by an embodiment of the present invention;

[0036] Figure 4b yes Figure 4aAA section view;

[0037] Figure 5a is a schematic structural diagram of a lower housing with a second sound guide channel provided by an embodiment of the present invention;

[0038] Figure 5b yes Figure 5a AA section view;

[0039] Figure 6a is a schematic structural diagram of a lower housing having a third sound guide channel provided by an embodiment of the present invention;

[0040] Figure 6b yes Figure 6a AA section view;

[0041] Figure 7a is a top view of a single-muffler cavity noise reduction earplug provided by an embodiment of the present invention;

[0042] Figure 7b yes Figure 7a AA section view;

[0043] Figure 8 It is a schematic diagram of PNC data of the earplug provided by an embodiment of the present invention in three silencing path cavities of LO / WO / SO;

[0044] Fig. 9 Schematic diagram of PNC data of the SO cavity structure earplug provided by an embodiment of the present invention at different mesh counts;

[0045] Fig.10 It is a schematic diagram of PNC data of an earplug with a single / double silencing cavity structure provided by an embodiment of the present invention;

[0046] Fig.11 is a schematic diagram of PNC data of the earplug provided by an embodiment of the present invention under different specifications of noise reduction damping parts;

[0047] Fig.12 is a schematic diagram of PNC data of earplugs in different structural combinations provided by an embodiment of the present invention;

[0048] Fig.13 It is a schematic diagram of the noise reduction recording effect of the earplugs provided by an embodiment of the present invention under different structural combinations.

[0049] 1. Upper shell; 2. Lower shell; 3. First sound-absorbing and damping component; 4. Sound-tuning mesh; 5. Outer shell; 6. Ear cap; 7. Air inlet; 8. Sound-guiding channel; 801. First sound-guiding channel; 802. Second sound-guiding channel; 9. Positioning hole; 10. First sound-absorbing cavity; 11. Second sound-absorbing cavity; 12. Air outlet; 13. Second sound-absorbing and damping component; 14. Positioning column. DETAILED DESCRIPTION

[0050] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0051] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0052] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] The inventor found in his work that although the noise reduction earplugs in the prior art can reduce noise to a certain extent, the noise reduction effect is limited and cannot meet the inventor's expectations. The inventor made the present invention after further research and development.

[0055] Embodiment 1

[0056] The embodiment of the present invention provides a noise reduction earplug, referring to Figure 1 , Figure 2a and Figure 2bAs shown, it comprises: an upper shell 1, a lower shell 2 and an outer shell 5. The lower shell 2 is disposed in the outer shell 5, the upper shell 1 and the lower shell 2 are fixedly connected, and the outer wall of the upper shell 1 abuts against the inner wall of the outer shell 5.

[0057] Reference Figure 3a and Figure 3b As shown, the upper shell and the lower shell 2 are sealed to form a first sound-absorbing cavity 10 and a sound-conducting channel 8, and the bottom of the lower shell 2 is sealed with the outer shell 5 to form a second sound-absorbing cavity 11, and the sound-conducting channel includes a first sound-conducting channel 801 and a second sound-conducting channel 802 respectively connected to the two sides of the first sound-absorbing cavity 10. The closed design of the upper shell 1 and the lower shell 2 helps the earplug to better fit the shape of the ear canal and reduce the gap between the earplug and the ear canal. This tight fit not only improves the noise reduction effect, but also reduces the discomfort caused by long-term wearing. Moreover, the closed structure reduces the possibility of sound waves leaking from the edge of the earplug, ensuring the stability and durability of the noise reduction effect.

[0058] The upper shell 1 is provided with an air inlet 7, the first sound guide channel 801 is communicated with the air inlet 7 and the first silencing cavity 10 respectively, and the second sound guide channel 802 is communicated with the first silencing cavity 10 and the second silencing cavity 11 respectively. The outer shell 5 is provided with an air outlet 12 at a position below the second silencing cavity 11, and the second silencing cavity 11 is communicated with the air outlet 12.

[0059] The first silencing cavity 10 and the second silencing cavity 11 are both provided with silencing damping elements. Figure 2b As shown, a first sound-absorbing damping member 3 is disposed in the first sound-absorbing cavity 10, and a second sound-absorbing damping member 13 is disposed in the second sound-absorbing cavity 11. The sound-absorbing damping member in the present invention can be made of materials with sound-absorbing function in the prior art, such as sound-absorbing cotton.

[0060] The first sound guide channel 801 and the second sound guide channel 802 each include at least two channel sections, and two adjacent channel sections are connected to form a corner. When a sound wave enters the sound guide channel, since the channel includes multiple channel sections and a corner is formed between adjacent channel sections, the sound wave will continuously encounter reflections from the wall during propagation. This reflection will cause the propagation direction of the sound wave to change continuously, increase the number of reflections and scatterings of the sound wave, and thus extend the propagation path of the sound wave. This complicated sound wave path helps to dissipate the sound wave energy more effectively and reduce the sound wave intensity.

[0061] The working process of the noise reduction earplug provided by the present invention is as follows: when the sound wave enters the first sound guide channel 801 from the air inlet 7 and propagates, it will encounter multiple channel sections and corners. These structures cause the sound wave to be reflected and scattered multiple times, and in this process, the energy of the sound wave will gradually dissipate. When the sound wave enters the first muffler cavity 10 after passing through the first sound guide channel 801, the sound wave will further reflect and scatter in the first muffler cavity 10, and interact with the first muffler damping member 3 in the cavity. The first muffler damping member 3 can absorb the energy of the sound wave, reduce the reflection and resonance of the sound wave in the cavity, and thus further reduce the intensity of the sound wave. After being processed by the first muffler cavity 10, the energy of the sound wave has been significantly reduced. The processed sound wave then enters the second sound guide channel 802, and the sound wave continues to be reflected, scattered and energy dissipated. After passing through the second sound guide channel 802, the sound wave enters the second muffler cavity 11. In this cavity, the sound wave interacts with the second muffler damping member 13 again to further absorb the energy of the sound wave. After being processed by the two silencing cavities and the two sound-conducting channels, the intensity of the sound waves has been greatly reduced. Finally, the remaining sound waves are discharged from the outside of the earplug through the air outlet 12 on the outer shell 5. The entire silencing process effectively reduces the intensity and energy of external noise through multiple reflections, scattering, energy dissipation, and interaction with the silencing damping parts. This design combination of multiple cavities, complex channels, and silencing damping parts enables the noise-reducing earplugs to achieve an efficient silencing effect, providing a quieter and more comfortable listening environment for the wearer.

[0062] The earplug provided by the embodiment of the present invention effectively absorbs the noise entering the earplug by setting a first silencing cavity 10 and a second silencing cavity 11, and respectively configuring a first silencing damping member 3 and a second silencing damping member 13 in these two cavities. These silencing damping members can reduce the reflection and resonance of sound waves in the cavity, thereby significantly reducing the impact of external noise on the wearer. The at least two channel sections included in the first sound guide channel 801 and the second sound guide channel 802 and the corners between adjacent channel sections further increase the complexity of the sound propagation path, so that the noise undergoes multiple reflections and energy dissipation when passing through the channel, further improving the noise reduction effect, so that the noise reduction earplug can more effectively isolate external noise and provide a quieter environment for the wearer. By setting an air inlet 7, external air is allowed to enter the first sound guide channel 801 and then enter the first silencing cavity 10, which helps to balance the air pressure inside and outside the earplug and reduce the discomfort caused by the air pressure difference. By providing the air outlet 12, the air in the second silencing cavity 11 can be discharged smoothly, thereby avoiding the pressure accumulation caused by sound propagation, and ensuring that the earplug has good air permeability and pressure discharge capabilities while reducing noise.

[0063] In addition, the first sound-absorbing cavity 10, the first sound-conducting channel 801 and the second sound-conducting channel 802 of the earplug provided by the present invention are formed by the upper shell 1 and the lower shell 2 being sealed. The closed sound-conducting channel design requires the sound waves to pass through multiple channel sections and corners during propagation, which increases the number of reflections and scatterings of the sound waves, thereby extending the propagation path of the sound waves. This complicated sound wave path helps to dissipate the sound wave energy more effectively and reduce the sound wave intensity. The first sound-absorbing cavity 10 is the main processing area for sound waves, and its closed structure can reduce the irregular reflection and resonance of sound waves in the cavity, thereby improving the sound-absorbing effect. At the same time, the first sound-absorbing damping member 3 in the first sound-absorbing cavity 10 can further absorb the sound wave energy and enhance the noise reduction effect. Moreover, the tight sealing of the upper shell 1 and the lower shell 2 makes the overall structure of the earplug more stable and not easy to loosen or fall off due to head movement. This stability ensures the continuity and reliability of the noise reduction effect.

[0064] For the first sound guide channel 801 and the second sound guide channel 802, the present invention provides three structures. Figure 4a and 4b As shown, the first sound guide channel (S) includes a first channel section and a second channel section, and the first channel section and the second channel section are connected to form a corner.

[0065] The first channel section extends along the circumferential direction of the upper shell 1 and the lower shell 2, and the second channel section of the first sound guiding channel 801 and the second channel section of the second sound guiding channel 802 are staggered relative to the first muffler cavity 10. The width of the first sound guiding channel 801 is the same as the width of the second sound guiding channel 802.

[0066] When the sound wave enters the first channel section of the first sound guide channel 801 through the air inlet 7, since the first channel section extends along the circumferential direction of the upper shell 1 and the lower shell 2, the sound wave will be initially guided and attenuated along this direction during the propagation process. When the sound wave reaches the corner formed by the first channel section and the second channel section, significant reflection and scattering will occur. After the sound wave enters the first silencer cavity 10, it will interact with the first silencer damping member 3 in the cavity to further absorb the sound wave energy. The sound wave processed by the first silencer cavity 10 continues to enter the second silencer cavity 11 through the second sound guide channel 802, and will interact with the second silencer damping member 13 in the cavity to further reduce the sound wave energy. The present invention significantly increases the propagation path length and complexity of the sound wave through the combined use of corner design, staggered second channel sections, and multi-stage silencer cavities, effectively reduces the sound wave energy, and improves the noise reduction effect.

[0067] Reference Figure 5a and 5bAs shown, the second sound guide channel (L) includes a plurality of third channel segments and a plurality of fourth channel segments, and the third channel segments and the fourth channel segments are alternately connected and form a corner. The third channel segment extends along the circumferential direction of the upper shell 1 and the lower shell 2, and the fourth channel segment of the first sound guide channel 801 and the fourth channel segment of the second sound guide channel 802 are staggered relative to the first muffler cavity 10.

[0068] When the sound wave enters the first sound guide channel 801 through the air inlet 7 on the upper shell 1, the sound wave propagates alternately along multiple third channel sections and fourth channel sections in the first sound guide channel 801, and reflection and scattering occur at each corner. The sound wave enters the first sound-absorbing cavity 10 through the first sound-absorbing cavity 801, interacts with the first sound-absorbing damping member 3 in the cavity, and further absorbs the sound wave energy. The sound wave processed by the first sound-absorbing cavity 10 continues to enter the second sound-absorbing cavity 802. After multiple reflections and scattering in the second sound-absorbing cavity 802, the sound wave continues to enter the second sound-absorbing cavity 11, and interacts with the second sound-absorbing damping member 13 therein again, further reducing the sound wave energy. The remaining sound waves are discharged from the outside of the earplug through the air outlet 12 on the outer shell 5.

[0069] Reference Figure 6a and 6b As shown, the third sound guide channel structure (W) is basically the same as the first sound guide channel structure, except that the width of this sound guide channel is greater than the width of the first sound guide channel structure.

[0070] In an alternative embodiment, referring to Figure 2a and Figure 2b As shown, the earplug further includes a tuning mesh 4, which is disposed on the top of the second silencing cavity 11. The tuning mesh 4 can absorb or scatter part of the sound wave energy, reduce the intensity of the sound wave when it is transmitted through the air outlet 12, and thus further improve the noise reduction performance of the earplug.

[0071] After the sound wave enters the earplug from the air inlet 7, it reaches the second sound-absorbing cavity through the first sound-guiding channel 801, the first sound-absorbing cavity 10, and the second sound-guiding channel 802. The present invention arranges the tuning mesh 4 at the top of the second sound-absorbing cavity 11, so that the sound wave after multi-stage sound-absorbing treatment can interact with the pores and fibers on the surface of the tuning mesh 4 before being discharged through the air outlet 12, thereby more effectively reducing noise.

[0072] In an optional embodiment, the first sound-absorbing damping member 3 and the second sound-absorbing damping member 13 are made of EVA material. EVA material has good sound absorption performance, can effectively absorb sound wave energy, reduce the reflection and resonance of sound waves in the sound-absorbing cavity, thereby improving the noise reduction effect of the earplug. Moreover, EVA material is relatively light. By setting the material of the first sound-absorbing damping member 3 and the second sound-absorbing damping member 13 to EVA material, the overall weight of the earplug can be reduced and the wearing comfort can be improved.

[0073] In an alternative embodiment, referring to Figure 3a and Figure 3b As shown, the lower shell 2 is provided with a positioning hole 9, and the upper shell 1 is provided with a positioning column 14 on the side facing the lower shell 2, and the positioning column 14 can be accommodated in the positioning hole 9. The close fit between the positioning column 14 and the positioning hole 9 can reduce the assembly gap between the upper shell 1 and the lower shell 2, and reduce the possibility of sound waves leaking through the shell gap. This helps to maintain the sealing of the first silencing cavity 10, reduce the penetration of external noise, and thus improve the noise reduction effect.

[0074] In an alternative embodiment, referring to Figure 2a and Figure 2b As shown, the earplug also includes an ear cap 6, which is arranged at the rear end of the outer shell 5 and is detachably connected to the outer shell 5. Since the ear cap is detachable, the user can choose a suitable size according to the shape and size of his or her ear to ensure that the earplug can fit the user's ear tightly, thereby improving the wearing comfort and experience. Moreover, the ear cap 6 serves as the last barrier between the earplug and the external environment, and its sealing directly affects the sound insulation effect. By selecting a suitable ear cap and ensuring that it fits the ear tightly, the penetration of external noise can be further reduced and the sound insulation performance of the earplug can be improved. In addition, when the ear cap is worn or damaged, the user can replace the ear cap separately, which helps to extend the service life of the earplug.

[0075] In an optional embodiment, the upper shell 1 and the lower shell 2 are ultrasonically welded to form a closed cavity. Figure 2b As shown, ultrasonic welding technology can be used to melt the contact surfaces of the upper shell 1 and the lower shell 2 and tightly combine to form a high-strength, seamless sealed connection, thereby effectively preventing external noise from penetrating into the earplug through the gap between the shells, thereby improving the noise reduction effect of the earplug. At the same time, the sealing effect of ultrasonic welding is long-lasting and stable, and is not easily affected by environmental factors such as temperature and humidity changes. This means that the earplug can maintain its sealing performance during long-term use and continue to effectively isolate external noise. Moreover, the connection formed by ultrasonic welding has high strength and can withstand certain external forces and impacts. This helps to extend the service life of the earplug and reduce performance degradation and replacement costs caused by shell damage.

[0076] In an alternative embodiment, referring to Figure 2b As shown, the second silencer cavity 11 is arranged near the rear end of the outer shell 5 and below the outlet end of the second sound guide channel 802. By placing the second silencer cavity 11 below the outlet end of the second sound guide channel 802, rather than being directly flush with the second sound guide channel 802, so that the second sound guide channel 802 is not directly aligned with the entrance of the second silencer cavity 11, the sound wave will be deflected or dispersed during the propagation from the second sound guide channel 802 to the second silencer cavity 11, thereby reducing the energy of the sound wave. By arranging the second silencer cavity 11 near the rear end of the outer shell 5, the space inside the outer shell 5 can be fully utilized to form the second silencer cavity 11, and the second silencer damping member 13 filled in the cavity can absorb and dissipate the energy of the sound wave, thereby reducing the noise level.

[0077] In an optional embodiment, the outer shell 5 is made of silicone, and the upper shell 1 and the lower shell 2 are made of hard rubber. The outer shell 5 is made of silicone to ensure a seamless connection between the outer shell 5 and the internal components, effectively preventing the penetration of external gas, thereby protecting the internal components from damage. The silicone material is soft to the touch and has good skin-friendliness. The outer shell 5 is made of silicone to reduce pressure and irritation on the skin, providing a more comfortable wearing experience. The hard rubber material has high structural strength and stability, and can withstand large external forces and impacts. The upper shell 1 and the lower shell 2 are made of hard rubber to ensure that the overall structure of the earplug is stable and not easily deformed or damaged.

[0078] The silicone outer shell of the present invention ensures the sealing performance and tactile comfort of the earplug, while the hard rubber upper shell and the hard rubber lower shell ensure the structural strength and processing accuracy of the earplug. The combination of the silicone outer shell and the hard rubber upper shell and the hard rubber lower shell makes the earplug have both good performance and high durability and reliability. Moreover, by using the combined design of the silicone outer shell and the hard rubber upper shell and lower shell, the overall experience of the user during use can be improved. The soft touch of the silicone can reduce the irritation and pressure on the user's skin, while the stability and durability of the hard rubber can ensure that the earplug can work normally in various environments.

[0079] In order to determine the best noise reduction structural solution, the present invention conducts a comparative study on the passive noise cancellation (PNC) data of earplugs under different noise reduction structural elements.

[0080] It should be noted that the present invention sets the internal tuning mesh 4, i.e., the tuning mesh 4, at the top of the second silencing cavity 11, and the cavity in which the silencing cotton is set in the second silencing cavity 11 is called a double silencing cavity (I). In contrast, the cavity in which the external tuning mesh 4, i.e., the tuning mesh 4, is set at the bottom of the second silencing cavity 11, and the cavity in which the silencing cotton is not set in the second silencing cavity 11 is called a single silencing cavity (O). The structural schematic diagram of the single silencing cavity structure earplug can be referred to in FIG. Figure 7a , 7b The meanings of the symbols in the diagram of the present invention are as follows:

[0081] SO: The first sound guide channel + single silencer cavity;

[0082] LO: The second sound guide channel + single silencer cavity;

[0083] WO: The third sound guide channel + single silencer cavity;

[0084] SI: The first sound guide channel + double silencer cavity;

[0085] LI: The second sound guide channel + double silencer cavity;

[0086] WI: The third sound guide channel + double silencer cavity.

[0087] 1. Test the PNC data of the earplugs in the three silencing path cavities of SO, LO and WO. The test results refer to Figure 8 As shown. Through data comparison, it can be seen that compared with LO / WO cavities, the noise reduction effect of earplugs in SO cavity is better. From the area marked in the noise reduction curve, the built-in noise-reducing cotton + loop sound guide channel eliminates the high-frequency part, and the external noise-reducing cotton and tuning mesh eliminate the low-frequency part.

[0088] 2. For the earplugs with SO cavity structure, set the tuning mesh 4 to different specifications (500 / 400 / 300 mesh respectively) and test the corresponding PNC data. The test results refer to Fig. 9 As shown. Through data comparison, it can be seen that when the specification of tuning mesh 4 is 500 mesh, the noise reduction effect of the earplug is better.

[0089] 3. Test the PNC data of the earplugs in two cavity specifications: SO / SI. The test results refer to Fig.10 As shown. By comparison, it can be seen that the earplug has a better noise reduction effect in the SI cavity, and, referring to Fig.10 In the middle marked area, the second silencer cavity 11 and the silencer cotton have a much lower low frequency than that without the silencer cotton, which indicates that the SI cavity can eliminate low-frequency noise.

[0090] 4. Test the PNC data of the second silencing cavity 11 when using silencing cotton of different specifications. The test results refer to Fig.11As shown in the figure, the noise reduction effect of using EVA_25A is better than that of using EVA_35A.

[0091] 5. Test the PNC data of earplugs with different noise reduction structure combinations. The noise reduction structure combinations include: single silencer cavity WO, single silencer cavity S0 + silencer cotton EVA25, double silencer cavity SI + silencer cotton EVA25. The test results refer to Fig.12 and Fig.13 As shown. By comparison, we can see that:

[0092] Single silencing chamber WO (mild noise reduction): noise reduction frequency is 300Hz~20kHz, and the average noise reduction is -14.5dB);

[0093] Single silencer chamber S0 + silencer cotton EVA25 (moderate noise reduction): the noise reduction frequency is 80Hz~20kHz, and the average noise reduction is -19.1dB;

[0094] Double silencer SI + silencer cotton EVA25 (heavy noise reduction): the noise reduction frequency is 20Hz~20kHz, and the average noise reduction is -29.8dB.

[0095] In summary, it can be concluded that the noise reduction data of the earplugs under the noise reduction structure of double silencer SI + silencer cotton EVA25 is the best. Noise reduction earplugs can give priority to this noise reduction structure to maximize the noise reduction effect.

[0096] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. The present invention is not limited to any single aspect, any single embodiment, or any combination and / or permutation of these aspects and / or embodiments. Each aspect and / or embodiment of the present invention can be used alone, or in combination with one or more other aspects and / or other embodiments.

[0097] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A noise reduction earplug, characterized in that: include: An upper shell (1), a lower shell (2) and an outer shell (5); The lower shell (2) is arranged in the outer shell (5), the upper shell (1) and the lower shell (2) are fixedly connected, and the outer wall of the upper shell (1) abuts against the inner wall of the outer shell (5); The upper shell and the lower shell (2) are sealed to form a first silencing cavity (10), a first sound guide channel (801) and a second sound guide channel (802); the bottom of the lower shell (2) and the outer shell (5) are sealed to form a second silencing cavity (11); The first sound guide channel (801) and the second sound guide channel (802) each include at least two channel sections, and two adjacent channel sections are connected to form a corner; The upper shell (1) is provided with an air inlet (7), and the first sound guide channel (801) is respectively connected to the air inlet (7) and the first muffler cavity (10); The second sound guide channel (802) is communicated with the first sound-absorbing cavity (10) and the second sound-absorbing cavity (11) respectively; The outer shell (5) is provided with an air outlet (12) at a position below the second silencing cavity (11), and the second silencing cavity (11) is in communication with the air outlet (12); The first silencing cavity (10) and the second silencing cavity (11) are both provided with silencing damping components.

2. The noise reduction earplug according to claim 1, characterized in that: The first sound guide channel (801) and the second sound guide channel (802) both include a first channel section and a second channel section, and the first channel section and the second channel section are connected to form a corner; The first channel section extends along the circumferential direction of the upper shell (1) and the lower shell (2); The second channel section of the first sound guiding channel (801) and the second channel section of the second sound guiding channel (802) are staggered relative to the first sound-absorbing cavity (10), and the width of the first sound guiding channel (801) is the same as the width of the second sound guiding channel (802).

3. The noise reduction earplug according to claim 1, characterized in that: The first sound guide channel (801) and the second sound guide channel (802) both include a plurality of third channel segments and a plurality of fourth channel segments, and the third channel segments and the fourth channel segments are alternately connected to form a corner; The third channel section extends along the circumferential direction of the upper shell (1) and the lower shell (2), and the fourth channel section of the first sound guiding channel (801) and the fourth channel section of the second sound guiding channel (802) are offset relative to the first silencer cavity (10).

4. The noise reduction earplug according to claim 2, characterized in that: It also comprises a sound-tuning mesh cloth (4), wherein the sound-tuning mesh cloth (4) is arranged on the top of the second silencing cavity (11).

5. The noise reduction earplug according to claim 1, characterized in that: The lower shell (2) is provided with a positioning hole, and the upper shell (1) is provided with a positioning column (14) on the side facing the lower shell (2), and the positioning column can be accommodated in the positioning hole (9).

6. The noise reduction earplug according to claim 1, characterized in that: It also comprises an ear cap (6), which is arranged at the rear end of the outer shell (5) and is detachably connected to the outer shell (5).

7. The noise reduction earplug according to claim 1, characterized in that: The upper shell (1) and the lower shell (2) are welded together by ultrasonic welding to form a closed cavity.

8. The noise reduction earplug according to claim 1, characterized in that: The second silencer cavity (11) is arranged near the rear end of the outer shell (5) and is located below the outlet end of the second sound guide channel (802).

9. The noise reduction earplug according to claim 1, characterized in that: The sound-absorbing and damping component is made of EVA material.

10. The noise reduction earplug according to claim 1, characterized in that: The outer shell (5) is made of silica gel, and the upper shell (1) and the lower shell (2) are made of hard rubber.

Images