Noise-reduction and sound-insulation earplug

Abstract

A noise-reduction and sound-insulation earplug for being placed in the ear canal to isolate external sound. The earplug comprises: a housing (10), provided with a ventilation chamber (11) therein and an interface (20) in communication with the ventilation chamber (11); an ear cap (30), disposed at the interface (20) and provided with a channel (31), wherein, when the noise-reduction and sound-insulation earplug is in a wearing state, the ventilation chamber (11) is in communication with the ear canal sequentially via the interface (20) and the channel (31); and a noise-reduction enhancement member, disposed in the ventilation chamber (11) and / or the interface (20) and comprising a zeolite material. The noise-reduction and sound-insulation earplug can solve the problem of existing sound-insulation earplugs not being able to provide simultaneously a noise reduction effect and wearing comfort.

Description

Noise reduction soundproof earplug

[0001] Related applications

[0002] The present application claims priority to Chinese Patent Application No. 202421547048.X, filed on July 2, 2024, and incorporates by reference the entire disclosure of the aforementioned patent application as part of the present application. TECHNICAL FIELD

[0003] The present application relates to the technical field of earplugs, in particular to a noise reduction soundproof earplug. BACKGROUND

[0004] In production, in order to reduce the impact of noise on the human body, in life, in order to achieve a quiet living, learning, working and sleeping environment, earplugs will be used to reduce noise and soundproof at the end of the human ear.

[0005] Most of the existing soundproof earplugs directly block air with materials to reduce noise and soundproof. Flexible materials are used. The wearer inserts them into the ear canal. The material rebounds to fill the ear canal, which can reduce the impact of external noise.

[0006] Inserting a soundproof earplug into the ear canal will cause the air in the ear canal to be squeezed by the soundproof earplug, which will cause pressure on the eardrum. Long-term wear will cause discomfort and tinnitus, and repeated use is not recommended.

[0007] Some new noise reduction soundproof earplugs consider comfort, but they have internal leakage holes that communicate with the outside, or are hollow inside, which does not achieve ideal noise reduction and soundproofing effects, and cannot balance noise reduction and comfort. SUMMARY

[0008] The purpose of the present application is to provide a noise reduction soundproof earplug that solves the problem of existing soundproof earplugs that cannot balance noise reduction and comfort.

[0009] The above technical purpose of the present application is mainly achieved by the following technical scheme:

[0010] The present application provides a noise reduction soundproof earplug for insertion into the ear canal to isolate external sounds, comprising: a shell having a ventilation chamber therein, the shell having an interface communicating with the ventilation chamber; an ear cap disposed at the interface, the ear cap having a passage disposed thereon, the noise reduction soundproof earplug in a worn state sequentially passing through the interface and the passage to communicate the ventilation chamber with the ear canal; a noise reduction enhancement member disposed in the ventilation chamber and / or the interface, the noise reduction enhancement member containing a zeolite material therein.

[0011] The noise reduction and sound insulation earplug of the present application can avoid generating a large ear pressure in the ear canal of the wearer when worn. The noise reduction and sound insulation earplug has a ventilation chamber capable of communicating with the ear canal. During wearing, the air in the ear canal can enter the ventilation chamber, thereby increasing the air flow space. That is, during wearing of the earplug, the air in the ear canal will not be blocked in the ear canal. Since the ear canal communicates with the ventilation chamber, the air in the ear canal can flow into the ventilation chamber when compressed, so that the pressure of the air in the ear canal does not change much, and the eardrum is not subjected to obvious compression. At the same time, the noise reduction and sound enhancement member arranged in the ventilation chamber has the effects of sound absorption and virtual expansion (zeolite material effect), which can absorb air to a certain extent to reduce the ear pressure in the ear canal and avoid generating a large ear pressure in the ear canal after wearing the earplug.

[0012] The noise reduction and sound insulation earplug of the present application can avoid the problem that the ear canal cannot be worn for a long time due to fluctuation of the ear pressure in the ear canal during wearing. The noise reduction and sound enhancement member arranged in the ventilation chamber also has a certain air pressure buffering function. When the position of the earplug changes or the air in the ear canal fluctuates due to movement of the wearer, the pressure of the air in the ear canal (ear pressure) will not fluctuate due to the buffering effect of the noise reduction and sound enhancement member, thereby improving the comfort during wearing of the earplug.

[0013] The noise reduction and sound insulation earplug of the present application can improve the sound insulation effect of the earplug. The virtual expansion effect of the noise reduction and sound enhancement member can virtually increase the actual physical cavity of the ventilation chamber (the effect caused by the micro-porous structure in the noise reduction and sound enhancement member). During use, the sound finally transmitted into the ear canal through sound insulation of the earplug will be guided into the shell due to the large cavity at the other end communicating with the ear canal, and will be consumed and absorbed by the noise reduction and sound enhancement member (zeolite material therein), thereby achieving a better noise reduction effect.

[0014] The noise reduction and sound insulation earplug of the present application has a wide range of applications. The ear cap and the shell are detachably connected, so that different sizes of ear caps can be replaced according to different wearers, thereby improving the application range of the earplug. Moreover, the ear cap with deteriorated sound insulation effect can be replaced after long-term use of the earplug, thereby prolonging the service life of the earplug.

[0015] In an optional embodiment of the present application, the shell comprises two half shells that are in abutment, and the ventilation chamber is formed between the two half shells.

[0016] In the present embodiment, the shell is formed by abutment of two half shells, which facilitates installation of the ventilation chamber and / or the noise reduction and sound enhancement member in the interface.

[0017] In an optional embodiment of the present application, the noise reduction enhancement is an acoustic absorption block made of zeolite, which is located in the ventilation chamber and / or the interface, and the outer contour of the acoustic absorption block is parallel to the side wall contour of the ventilation chamber and / or the interface.

[0018] In an optional embodiment of the present application, the noise reduction enhancement is an acoustic absorption sheet or block containing zeolite, which is arranged at the interface.

[0019] In an optional embodiment of the present application, the acoustic absorption sheet comprises a three-dimensional frame structure and the zeolite loaded on the three-dimensional frame structure.

[0020] In this embodiment, the acoustic absorption sheet is formed by zeolite adsorbed on the three-dimensional frame structure, which can improve the sound absorption and buffering effect of the acoustic absorption sheet.

[0021] In an optional embodiment of the present application, the noise reduction enhancement is an acoustic absorption particle containing zeolite, and a plurality of the acoustic absorption particles are filled in the ventilation chamber and / or the interface.

[0022] In an optional embodiment of the present application, the noise reduction and sound insulation earplug further comprises a dustproof member arranged at the interface to prevent impurities from entering the ventilation chamber.

[0023] In this embodiment, the dustproof member not only prevents impurities from the outside from entering the ventilation chamber, but also prevents the debris generated by the noise reduction enhancement in the ventilation chamber from entering the ear canal.

[0024] In an optional embodiment of the present application, the dustproof member is a dustproof mesh, and the mesh size of the dustproof mesh is less than 0.2 mm.

[0025] In an optional embodiment of the present application, the ear cap is an elastic ring column member made of flexible material, and the channel is a hollow position of the elastic ring column member.

[0026] In this embodiment, the ear cap is fitted to the side wall of the ear canal of the wearer, and has a certain elasticity to better fit the ear canal of the wearer, thereby enhancing the sound insulation effect of the earplug.

[0027] In an optional embodiment of the present application, a ring groove is arranged on the side wall of the channel, the interface has a convex ring, and the convex ring can be clamped in the ring groove to enable the ear cap to be sleeved on the interface; or, a convex ring is arranged on the side wall of the channel, the interface has a ring groove, and the convex ring can be clamped in the ring groove to enable the ear cap to be sleeved on the interface.

[0028] In this embodiment, the ear cap and the interface are directly clamped together, which facilitates the installation and removal of the ear cap. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings described herein are for illustrative purposes only and are not intended to limit the scope of this application in any way. In addition, the shapes and scales of the components in the drawings are only schematic and used to help understand this application, and are not intended to specifically limit the shapes and scales of the components in this application. Those skilled in the art, under the teachings of this application, can select various possible shapes and scales to implement this application according to specific circumstances. In the drawings:

[0030] Figure 1 is a structural schematic diagram of the first embodiment of the noise-canceling and sound-insulating earplug of this application;

[0031] Figure 2 is a structural schematic diagram of the second embodiment of the noise-canceling and sound-insulating earplug of this application;

[0032] Figure 3 is a structural schematic diagram of the third embodiment of the noise-canceling and sound-insulating earplug of this application;

[0033] Figure 4 is a structural schematic diagram of the fourth embodiment of the noise-canceling and sound-insulating earplug of this application;

[0034] Figure 5 is a structural schematic diagram of the fifth embodiment of the noise-canceling and sound-insulating earplug of this application.

[0035] Explanation of reference numerals in the attached drawings: 10, outer shell; 11, ventilation chamber; 20, interface; 30, ear cap; 31, channel; 40, sound-absorbing block; 41, sound-absorbing sheet; 42, sound-absorbing particles; 50, dustproof component. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0037] It is to be noted that when an element as a "set on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or a middle element can exist at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiment.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] As shown in FIGS. 1-5, the present application provides a noise reduction and sound insulation earplug for insertion into an ear canal to isolate external sound, which comprises: a shell 10 having a ventilation chamber 11 therein, the shell 10 having an interface 20 communicating with the ventilation chamber 11; an ear cap 30 detachably arranged at the interface 20, the ear cap 30 being provided with a passage 31, and in the worn state of the noise reduction and sound insulation earplug, the ventilation chamber 11 is communicated with the ear canal through the interface 20 and the passage 31 in sequence; a noise reduction and enhancement member, the noise reduction and enhancement member being arranged in the ventilation chamber 11 and / or the interface 20, and the noise reduction and enhancement member containing a zeolite material therein, which is used to adsorb at least part of the air in the ear canal to reduce the ear pressure in the ear canal.

[0040] The noise reduction and sound insulation earplug described in the present application can avoid generating a large ear pressure in the ear canal of the wearer when worn. When the earplug is worn, the earplug and the ear canal will eventually form a relatively closed space. The earplug has a ventilation chamber 11 capable of communicating with the ear canal, and during wearing, the air in the ear canal can enter the ventilation chamber 11, thereby increasing the air flow space. That is, during wearing of the earplug, the air in the ear canal will not be blocked in the ear canal, and since the ear canal is communicated with the ventilation chamber 11, the air in the ear canal can flow into the ventilation chamber 11 when compressed, so that the pressure of the air in the ear canal does not change much, and the eardrum is not subjected to obvious compression. At the same time, the noise reduction and enhancement member arranged in the ventilation chamber 11 has the effects of sound absorption and virtual expansion (the effect of the zeolite material), and as the pressure in the ear canal increases after wearing the earplug, the air adsorption effect of the noise reduction and enhancement member is enhanced, which can adsorb air to a certain extent to reduce the ear pressure in the ear canal, thereby avoiding a large ear pressure in the ear canal after wearing the earplug.

[0041] The noise reduction and sound insulation earplug described in the present application can avoid the problem that the fluctuation of ear pressure in the ear canal during wearing cannot be worn for a long time. The noise reduction enhancer arranged in the ventilation chamber 11 also has a certain air pressure buffering function. When the position of the earplug changes or the air in the ear canal fluctuates due to the movement of the wearer, the pressure of the air in the ear canal (ear pressure) will not fluctuate under the buffering effect of the noise reduction enhancer, thereby improving the comfort during wearing of the earplug.

[0042] The noise reduction and sound insulation earplug described in the present application can improve the sound insulation effect of the earplug. In use, the sound ultimately transmitted into the ear canal through sound insulation of the earplug will be drained into the ventilation chamber 11 due to the larger cavity at the other end connected with the ear canal, and will be consumed and absorbed by the noise reduction enhancer, thereby achieving better noise reduction effect.

[0043] The noise reduction and sound insulation earplug described in the present application has a wide range of applications. The ear cap 30 and the shell 10 are detachably connected, different sizes of ear caps 30 can be replaced according to different wearers, thereby improving the application range of the earplug; and the ear cap 30 with deteriorated sound insulation effect can be replaced after long-term use of the earplug, thereby prolonging the service life of the earplug.

[0044] The specific structure of each part of the noise reduction and sound insulation earplug described in the present application, and the position and connection relationship between the structures will be described in detail below.

[0045] As shown in FIGS. 1 and 2, the noise reduction and sound insulation earplug described in the present application has a shell 10, which is a thin-walled shell, and the shell 10 is the main structure of the entire earplug; a ventilation chamber 11 is formed in the shell 10, which can be connected with the ear canal of the wearer after the wearer wears the above-mentioned earplug.

[0046] The shape of the shell 10 can be designed according to actual needs, which is not specifically limited here; as shown in FIG. 1, in the present embodiment, the shell 10 is designed in a shape similar to a boomerang, a bending part is formed in the middle, one end is provided with a connector 20 for connecting with the ear cap 30, and the other end is closed and facilitates the wearer to take the earplug.

[0047] The connector 20 is a connecting circular hole penetrating through the above-mentioned shell 10, the ventilation chamber 11 in the shell 10 can be connected with the outside through the connector 20, and the ear cap 30 is detachably connected to the connector 20; during wearing of the above-mentioned earplug, the ear cap 30 enters the ear canal of the wearer and is attached to the side wall of the ear canal. And the ear cap 30 can connect the ear canal with the ventilation chamber 11, and the air in the ear canal can flow into the ventilation chamber 11.

[0048] As shown in FIG. 1 to FIG. 3, the noise reduction earplug described in the present application also has a noise reduction enhancement element arranged in the ventilation chamber 11 and / or the interface 20. The noise reduction enhancement element contains sound-absorbing material zeolite, which has a microporous structure inside, so the porous channel structure unique to the noise reduction enhancement element can play a buffering role, and the larger cavity formed by the virtual expansion effect can reduce the air pressure (ear pressure) and compression feeling in the ear canal of the wearer. At the same time, the noise reduction enhancement element also has sound-absorbing effect, and part of the sound finally transmitted into the ear canal through the earplug sound insulation will be guided to flow into the ventilation chamber 11, and then be consumed and absorbed by the noise reduction enhancement element in the ventilation chamber 11, thereby improving the noise reduction effect of the earplug.

[0049] Further, as shown in FIG. 1, the noise reduction enhancement element can be arranged in the ventilation chamber 11; as shown in FIG. 2, the noise reduction enhancement element can also be arranged in the interface 20; as shown in FIG. 3, the noise reduction enhancement element can also be arranged in the ventilation chamber 11 and the interface 20 at the same time.

[0050] The structure and technical effects of the optional embodiments of the noise reduction earplug described in the present application will be further described below.

[0051] According to one embodiment of the present application, the shell 10 includes two half shells that are oppositely connected, and the ventilation chamber 11 is formed between the two half shells. The shell 10 is formed by butting the two half shells, which can facilitate the installation of the noise reduction enhancement element in the ventilation chamber 11 and / or the interface 20.

[0052] Of course, in other embodiments of the present application, the shell 10 can also be a one-piece structure, but it needs to be considered whether the noise reduction enhancement element can be installed from the interface 20 into the ventilation chamber 11 or the interface 20. If the shape of the noise reduction enhancement element causes it to be unable to be installed from the interface 20, the shell 10 cannot adopt a one-piece structure.

[0053] According to one embodiment of the present application, as shown in FIG. 1 to FIG. 3, the noise reduction enhancement element is a sound-absorbing block 40 made of zeolite, which is located in the ventilation chamber 11 and / or the interface 20, and the outer contour of the sound-absorbing block 40 matches the contour of the side wall of the ventilation chamber 11 and / or the interface 20.

[0054] Specifically, as shown in FIG. 1, the zeolite block (sound-absorbing block 40) made of zeolite is arranged in the ventilation chamber 11 and partially fills the space in the ventilation chamber 11. The filling range of the zeolite block in the ventilation chamber 11 can be determined according to actual needs, that is, the zeolite block can also fill the entire ventilation chamber 11. The outer contour of the zeolite block is parallel to the contour of the inner side wall of the ventilation chamber 11, that is, the zeolite block can be directly clamped and positioned and fixed by the inner side wall of the ventilation chamber 11.

[0055] As shown in FIG. 2, the difference between the embodiment shown in FIG. 2 and the embodiment shown in FIG. 1 is that the zeolite block (sound-absorbing block 40) is arranged in the interface 20, and the outer contour of the zeolite block is parallel to the inner side wall contour of the interface 20; as shown in FIG. 3, the difference between the embodiment shown in FIG. 3 and the embodiment shown in FIG. 1 is that the zeolite block (sound-absorbing block 40) is arranged in both the venting chamber 11 and the interface 20.

[0056] According to an embodiment of the present application, as shown in FIG. 4, the noise reduction enhancement is a sound-absorbing sheet 41 containing zeolite, and the sound-absorbing sheet 41 is arranged at the interface 20.

[0057] Specifically, as shown in FIG. 4, the sound-absorbing sheet 41 directly made of zeolite is arranged at the position where the interface 20 communicates with the venting chamber 11, thereby forming a sound-absorbing layer between the interface 20 and the venting chamber 11; the sound-absorbing sheet 41 is a circular sheet structure, which can be fixed at one end of the interface 20 by means of bonding or clamping.

[0058] Optionally, the sound-absorbing sheet 41 comprises a three-dimensional frame structure and zeolite loaded on the three-dimensional frame structure. The sound-absorbing sheet 41 made of zeolite and the three-dimensional frame structure (carbon skeleton, organic skeleton, etc.) can improve the sound-absorbing and buffering effects of the sound-absorbing sheet 41, thereby improving the use experience of the noise reduction and sound insulation earplug.

[0059] According to an embodiment of the present application, as shown in FIG. 5, the noise reduction enhancement is sound-absorbing particles 42 containing zeolite, and a plurality of sound-absorbing particles 42 are filled in the venting chamber 11 and / or the interface 20.

[0060] Specifically, as shown in FIG. 5, the noise reduction enhancement can also adopt sound-absorbing particles 42 made of zeolite, a plurality of sound-absorbing particles 42 are filled in the venting chamber 11 and fixed by a fixing net or adhesive bonding, thereby avoiding the sound-absorbing particles 42 from shaking; according to actual needs, the sound-absorbing particles 42 can be partially filled in the venting chamber 11, or the sound-absorbing particles 42 can be filled in the venting chamber 11 and the interface 20, which is not limited herein.

[0061] The sound-absorbing block 40, the sound-absorbing sheet 41 or the sound-absorbing particles 42 are all structural forms of the noise reduction enhancement, and all can achieve the technical effects of the noise reduction enhancement as described above, and the principle and technical effects of the noise reduction enhancement with the above three structural forms will not be described herein.

[0062] According to one embodiment of the present application, as shown in FIG. 1 and FIG. 5, the noise reduction and sound insulation earplug further comprises a dustproof member 50 arranged at the interface 20 to prevent impurities from entering the ventilation chamber 11; the dustproof member 50 is arranged at the end of the interface 20 facing the ear cap 30 and can be fixed by adhesion or clamping. The dustproof member 50 not only prevents impurities from the outside from entering the ventilation chamber 11, but also prevents the debris generated by the noise reduction and sound enhancement member in the ventilation chamber 11 from entering the ear canal.

[0063] Optionally, the dustproof member 50 is a dustproof mesh, and the mesh size of the dustproof mesh is less than 0.2 mm; that is, if the mesh hole is a circular hole, the diameter of the circular hole is less than 0.2 mm, and if the mesh hole is a square hole, the side length of the square hole is less than 0.2 mm.

[0064] According to one embodiment of the present application, the ear cap 30 is an elastic ring column member made of a flexible material, and the hollow part in the elastic ring column member forms the above-mentioned channel 31, and the ventilation chamber 11 is connected with the ear canal through the channel 31. The ear cap 30 is in contact with the side wall of the ear canal of the wearer, and has a certain elasticity to better fit the ear canal, thereby enhancing the sound insulation effect of the earplug.

[0065] Optionally, the ear cap 30 can be made of rubber with good flexibility.

[0066] According to one embodiment of the present application, as shown in FIG. 1, a ring groove is arranged on the side wall of the channel 31, and the interface 20 has a convex ring which can be clamped in the ring groove to enable the ear cap 30 to be sleeved on the interface 20; the ring groove is arranged at the end of the channel 31 close to the shell 10, and the convex ring is formed on the outer side wall of the interface 20, so that the ear cap 30 and the interface 20 are directly clamped together, facilitating the installation and removal of the ear cap 30.

[0067] In other embodiments of the present application, the positions of the ring groove and the convex ring can be interchanged; that is, a convex ring is arranged on the side wall of the channel 31, and the outer side wall of the interface 20 has a ring groove, and the convex ring on the ear cap 30 can be clamped into the ring groove on the interface 20 to realize the installation of the ear cap 30.

[0068] As shown in Table 1 below, the noise reduction effect and ear pressure of different types of earplugs, it can be known that the technical scheme (noise reduction and sound insulation earplug) provided by the present application can greatly reduce the ear pressure and bring excellent noise reduction effect.

[0069] Table 1 Comparison of noise reduction effect and ear pressure of different types of earplugs

[0070] The above-described specific embodiments have further detailed the purposes, technical solutions and beneficial effects of the present application, and it should be understood that the above-described is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A noise reducing, sound insulating earplug for insertion into an ear canal to insulate against ambient sound, wherein, The application relates to a noise reduction earplug, comprising: a shell having a ventilation chamber inside, the shell having an interface communicating with the ventilation chamber; an ear cap arranged at the interface, the ear cap being provided with a channel, the noise reduction earplug being used to communicate the ventilation chamber with the ear canal through the interface and the channel in sequence in a wearing state; a noise reduction enhancer arranged in the ventilation chamber and / or the interface, the noise reduction enhancer containing a zeolite material.

2. The noise reducing, sound isolating earplug of claim 1, wherein, The shell comprises two half shells arranged oppositely, and the ventilation chamber is formed between the two half shells.

3. The noise reducing, sound isolating earplug of claim 1, wherein, The noise reduction enhancer is an acoustic absorption block made of zeolite, the acoustic absorption block being arranged in the ventilation chamber and / or the interface, and the outer contour of the acoustic absorption block being parallel to the side wall contour of the ventilation chamber and / or the interface.

4. The noise reducing, sound isolating earplug of claim 1, wherein, The noise reduction enhancer is an acoustic absorption sheet or block containing zeolite, and the acoustic absorption sheet is arranged at the interface.

5. The noise-reducing, sound-isolating earplug of claim 4, wherein, The acoustic absorption sheet comprises a three-dimensional frame structure and the zeolite loaded on the three-dimensional frame structure.

6. The noise-reducing, sound-isolating earplug of claim 1, wherein, The noise reduction enhancer is an acoustic absorption particle containing zeolite, and a plurality of acoustic absorption particles are filled in the ventilation chamber and / or the interface.

7. The noise-reducing, sound-isolating earplug of any one of claims 1 to 6, wherein, The noise reduction earplug further comprises: a dustproof member arranged at the interface to prevent impurities from entering the ventilation chamber.

8. The noise-reducing, sound-isolating earplug of claim 7, wherein, The dustproof member is a dustproof net, and the mesh size of the dustproof net is less than 0.2 mm.

9. The noise-reducing, sound-isolating earplug of any one of claims 1 to 6, wherein, The ear cap is an elastic ring column member made of flexible material, and the channel is a hollow position of the elastic ring column member.

10. The noise-reducing, sound-isolating earplug of claim 9, wherein, A ring groove is arranged on the side wall of the channel, the interface has a convex ring, and the convex ring can be clamped in the ring groove to enable the ear cap to be sleeved on the interface; or a convex ring is arranged on the side wall of the channel, the interface has a ring groove, and the convex ring can be clamped in the ring groove to enable the ear cap to be sleeved on the interface.

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