Earplug

Abstract

The embodiment of the utility model provides an earplug, the earplug comprises an elastic sound tube, a noise reduction structure and an ear cap, a channel in the elastic sound tube comprises a first sound channel and a second sound channel which are communicated with each other, the first sound channel is communicated with the second sound channel and an external environment, and the noise reduction structure movably penetrates through the first sound channel along a first direction. In the first direction, the cross sectional area of the noise reduction structure is increased or decreased, so that the first sound channel is expanded or contracted, and the amount of sound entering the first sound channel is adjusted to achieve noise reduction. According to the earplug provided by the embodiment of the invention, the cross sectional area of the first sound channel is changed through the movement of the noise reduction structure in the first direction, so that the matching tightness of the noise reduction structure and the first sound channel is adjusted, the amount of external sound entering the ear cap is controlled, and different levels of noise reduction effects are realized. A user can switch to a proper noise reduction mode according to the noise levels of different environments, and the use experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of audio electronic devices, and in particular to an earplug. BACKGROUND

[0002] In the related art, an earplug relies on soft material to directly isolate the ear canal from the external environment to achieve a noise reduction effect. However, in different environments, the degree of noise reduction required by a user is different. The existing earplug only has a fixed noise reduction mode, and the user cannot arbitrarily adjust the noise reduction depth according to different use environments, which affects the user experience. SUMMARY

[0003] Therefore, an embodiment of the present application provides an earplug, which can switch the noise reduction mode by making the noise reduction structure move in the first sound channel to make the first sound channel contract or expand, thereby adjusting the amount of sound entering the first sound channel, and improving the user experience.

[0004] An embodiment of the present application provides an earplug, which comprises:

[0005] An elastic sound tube, a channel in the elastic sound tube comprises a first sound channel and a second sound channel that are in communication with each other, the first sound channel communicates the second sound channel and an external environment, the elastic sound tube has a sound outlet, the sound outlet is in communication with one end of the second sound channel away from the first sound channel;

[0006] A noise reduction structure movably arranged in the first sound channel along a first direction;

[0007] An ear cap, which is sleeved on one end of the elastic sound tube away from the noise reduction structure and in communication with the sound outlet;

[0008] Wherein, along the first direction, the cross-sectional area of the noise reduction structure increases or decreases to make the first sound channel expand or contract to adjust the amount of sound entering the first sound channel to achieve noise reduction, and the first direction is parallel to the extension direction of the first sound channel.

[0009] In some embodiments, the elastic sound tube is provided with a first sound inlet and a second sound inlet, the first sound inlet and the second sound inlet are arranged on opposite sides of the first sound channel along the first direction, for communicating the first sound channel and the external environment, and along the first direction, the cross-sectional area of the noise reduction structure gradually increases towards the first sound inlet.

[0010] In some embodiments, along the projection in the plane parallel to the first direction, the sound outlet is located between the first sound inlet and the second sound inlet.

[0011] In some embodiments, the noise reduction structure is capable of moving through the first sound passage in a first direction relative to the elastic sound tube.

[0012] In some embodiments, the noise reduction structure is capable of rotating through the first sound passage in a first direction relative to the elastic sound tube.

[0013] In some embodiments, the noise reduction structure is in an arc shape.

[0014] In some embodiments, along the first direction, an outer surface of the noise reduction structure is provided with a plurality of adjustment scales.

[0015] In some embodiments, a cross-sectional area of the second sound passage is constant; or, along a direction close to the sound outlet, the cross-sectional area of the second sound passage gradually increases.

[0016] In some embodiments, the earplug comprises an acoustic mesh, and the acoustic mesh is arranged at the sound outlet.

[0017] In some embodiments, along a direction close to the first sound passage, the elastic sound tube comprises a first tube segment, a second tube segment and a third tube segment, spaces in the first tube segment, the second tube segment and the third tube segment define at least part of the second sound passage, an outer diameter of the second tube segment is smaller than an outer diameter of the first tube segment and an outer diameter of the third tube segment; the ear cap is provided with a first mounting hole and a second mounting hole in communication, a hole diameter of the first mounting hole is smaller than a hole diameter of the second mounting hole.

[0018] The outer diameter of the first tube segment is greater than the hole diameter of the first mounting hole, the first tube segment is arranged in the second mounting hole through the first mounting hole, and the second tube segment is arranged in the first mounting hole.

[0019] In some embodiments, the elastic sound tube is transparent.

[0020] The earplug provided by the embodiments of the present application can change the cross-sectional area of the first sound passage through the movement of the noise reduction structure in the first direction, thereby adjusting the tightness of the cooperation between the noise reduction structure and the first sound passage, and then controlling the amount of external sound entering the ear cap, so as to achieve different levels of noise reduction effect. Users can switch to the appropriate noise reduction mode according to the noise level of different environments, thereby improving the user experience. The arrangement of the elastic sound tube can facilitate the adaptation to the shape of the ear canal of different users, and can also stably cooperate with the noise reduction structure, thereby increasing the structural stability of the earplug. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a structural schematic diagram of an earplug according to an embodiment of the present application;

[0022] Figure 2 Fig. 1 is an exploded schematic view of an earplug according to the present application; Figure 1

[0023] Figure 3 Fig. 2 is another exploded schematic view of the earplug shown in Fig. 1 ; Figure 1

[0024] Figure 4 Fig. 3 is a cross-sectional schematic view of the earplug shown in Fig. 1. Figure 1

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1 - earplug;

[0027] 11 - elastic sound tube; 11a - first sound passage; 11b - second sound passage; 11c - sound outlet; 11d - first sound inlet; 11e - second sound inlet; 111 - first tube segment; 112 - second tube segment; 113 - third tube segment;

[0028] 12 - noise reduction structure; 121 - adjustment scale;

[0029] 13 - ear cap; 13a - first mounting hole; 13b - second mounting hole;

[0030] 14 - acoustic mesh. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0032] In the specific embodiments, each specific technical feature described can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the present application are not described again.

[0033] In the following description, the terms "first\second\..." are only used to distinguish different objects and do not mean that each object has the same or related aspects. It should be understood that the positional description "above", "below", "outer", "inner" are the positions in the normal use state, and the "left" and "right" directions represent the left and right directions shown in the specific corresponding schematic diagram, which can be the left and right directions in the normal use state or not.

[0034] ​​​It is to be understood that the terms "including", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. "A plurality" means two or more.

[0035] An earplug 1 is provided in embodiments of the present application.

[0036] It can be understood that the earplug 1 can be an audio product, i.e. an earphone front-end earplug structure, which is a small receiver commonly used in radios and hearing aids. The earplug 1 can also refer to a life product that is inserted into the ear for noise reduction and ear protection. In embodiments of the present application, the earplug 1 is described as an example for noise reduction.

[0037] Referring to Figures 1 to 4 , the earplug 1 comprises an elastic sound tube 11, a noise reduction structure 12, and an ear cap 13.

[0038] The channel in the elastic sound tube 11 comprises a first sound channel 11a and a second sound channel 11b that are in communication with each other, the first sound channel 11a communicates the second sound channel 11b with the external environment, and the elastic sound tube 11 has a sound outlet 11c that communicates with one end of the second sound channel 11b away from the first sound channel 11a.

[0039] Specifically, the elastic sound tube 11 refers to a structure that has the ability to elastically deform by itself. For example, the elastic sound tube 11 can be made of soft material, such as silicone or rubber, so that the elastic sound tube 11 has good flexibility and elasticity, and can better cooperate with the noise reduction structure 12 and the ear cap 13, thereby improving the comfort and stability of wearing.

[0040] The first sound channel 11a and the second sound channel 11b can transmit sound from the external environment or an audio source to the user's ear canal. Specifically, the first sound channel 11a is the main interface between the earplug 1 and the external environment, which can receive sound signals from the external environment or an audio source and transmit them to the second sound channel 11b, and the second sound channel 11b transmits the sound to the user's ear canal through the sound outlet 11c.

[0041] The noise reduction structure 12 refers to a structure that produces a noise reduction effect for the user.

[0042] The noise reduction structure 12 is movably arranged in the first sound channel 11a along a first direction. The ear cap 13 is arranged on the end of the elastic sound tube 11 away from the noise reduction structure 12 and communicates with the sound outlet 11c.

[0043] Here, the noise reduction structure 12 is movably arranged in the first sound passage 11a along the first direction, which means that the noise reduction structure 12 can move in the first sound passage 11a relative to the elastic sound tube 11. It should be noted that the movement here can be movement or rotation, which is not limited here.

[0044] The ear cap 13 is used to cooperate with the ear canal of the user, and the ear cap 13 is sleeved on the end of the elastic sound tube 11 away from the noise reduction structure 12. The structure of the elastic sound tube 11 can adapt to the shape of the ear canal of different users, reduce the feeling of oppression on the ear canal, and improve the comfort and stability of wearing. At the same time, the cooperation of the ear cap 13 and the elastic sound tube 11 also facilitates the close fit of the ear canal, so that the earplug 1 is not easy to fall off during movement or activity, and the use stability is improved. The sound transmitted from the second sound passage 11b can be transmitted to the user's ear canal through the sound outlet 11c through the ear cap 13.

[0045] The ear cap 13 and the elastic sound tube 11 can be detachably connected, so as to clean and replace the ear cap 13.

[0046] Here, along the first direction, the cross-sectional area of the noise reduction structure 12 increases or decreases, so that the first sound passage 11a expands or shrinks, so as to adjust the amount of sound entering the first sound passage 11a to achieve noise reduction. The first direction is parallel to the extension direction of the first sound passage 11a.

[0047] It should be noted that the increase or decrease here can be step change or continuous change, which can be linear change, exponential change or logarithmic change, which is not limited here.

[0048] Specifically, the movement of the noise reduction structure 12 in the first direction will change the cross-sectional area of the first sound passage 11a.

[0049] When the cross-sectional area of the noise reduction structure 12 decreases, the cross-sectional area of the first sound passage 11a will increase. Due to the elastic material of the elastic sound tube 11, the tightness of the cooperation between the noise reduction structure 12 and the first sound passage 11a becomes loose, the cross-sectional area of the first sound passage 11a will decrease, and the passage will become narrow. At this time, the cooperation gap between the first sound passage 11a and the noise reduction structure 12 is large, and the amount of sound entering the first sound passage 11a can be more.

[0050] When the cross-sectional area of the noise reduction structure 12 increases, due to the elastic material of the elastic sound tube 11, the tightness of the cooperation between the noise reduction structure 12 and the first sound passage 11a is improved, the cross-sectional area of the first sound passage 11a will increase, and the passage will become wide. At this time, due to the close cooperation between the first sound passage 11a and the noise reduction structure 12, the cooperation gap between them is small, and the amount of sound entering the first sound passage 11a is reduced.

[0051] By the movement of the noise reduction structure 12, the cross-sectional area of the first sound channel 11a can be adjusted, the tightness of the cooperation between the noise reduction structure 12 and the first sound channel 11a can be changed, and thus the amount of sound entering the first sound channel 11a can be adjusted, and different degrees of noise reduction can be achieved. For example, in a scene where more environmental sound is needed, such as a workplace, sports or outdoor activities, the noise reduction structure 12 can be made to cooperate with the first sound channel 11a more loosely to allow more environmental sound to enter, and in a sleep scene, the noise reduction structure 12 can be made to cooperate with the first sound channel 11a more tightly to achieve a high-isolation noise reduction effect.

[0052] It should be noted that the noise reduction structure 12 can be movably arranged in the first sound channel 11a in the first direction, that is, the noise reduction structure 12 will not fall off from the first sound channel 11a even in the case where the tightness of the cooperation between the noise reduction structure 12 and the first sound channel 11a is the loosest, that is, the noise reduction structure 12 can have a relatively tight cooperation with the elastic sound tube 11.

[0053] For example, the cross-sectional area of the noise reduction structure 12 is not less than the cross-sectional area of the first sound channel 11a at any place. In this way, the tightness of the cooperation between the noise reduction structure 12 and the elastic sound tube 11 can be increased.

[0054] The first direction is parallel to the extension direction of the first sound channel 11a, which facilitates increasing the movement reliability of the noise reduction structure 12 and better adapting the noise reduction structure 12 to the first sound channel 11a. The first direction herein can be a straight direction or a circumferential direction.

[0055] In the related art, the earplug relies on a soft material to directly isolate the ear canal from the external environment to achieve a noise reduction effect. However, in different environments, the user has different needs for the degree of noise reduction. The existing earplug only has a fixed noise reduction mode, and the user cannot arbitrarily adjust the depth of noise reduction according to different use environments, which affects the user experience.

[0056] The earplug 1 provided by the embodiments of the present application can change the cross-sectional area of the first sound channel 11a by the movement of the noise reduction structure 12 in the first direction, thereby adjusting the tightness of the cooperation between the noise reduction structure 12 and the first sound channel 11a, and then controlling the amount of external sound entering the ear cap 13 to achieve different levels of noise reduction effect. The user can switch to a suitable noise reduction mode according to the noise level of different environments, thereby improving the user experience. The elastic sound tube 11 is arranged to facilitate adapting to the shape of the ear canal of different users, and can stably cooperate with the noise reduction structure 12 to increase the structural stability of the earplug 1.

[0057] In some embodiments, please refer to Figure 2 and Figure 3The elastic sound tube 11 is provided with a first sound inlet 11d and a second sound inlet 11e, which are arranged on opposite sides of the first sound channel 11a along the first direction, and are used to connect the first sound channel 11a and the external environment. Along the first direction towards the first sound inlet 11d, the cross-sectional area of the noise reduction structure 12 gradually increases.

[0058] That is, the sound of the external environment can enter the first sound channel 11a through the first sound inlet 11d or the second sound inlet 11e.

[0059] Along the first direction towards the first sound inlet 11d, the cross-sectional area of the noise reduction structure 12 gradually increases, that is, the cross-sectional area of the noise reduction structure 12 continuously changes. That is, along the first direction towards the second sound inlet 11e, the cross-sectional area of the noise reduction structure 12 gradually decreases. When the noise reduction structure 12 is arranged in the first sound channel 11a, due to the elastic properties of the elastic sound tube 11, the size of the first sound inlet 11d is smaller than that of the second sound inlet 11e.

[0060] In this embodiment, the first sound inlet 11d and the second sound inlet 11e can collect sound in multiple directions, improve the stereoscopic and spatial sense of sound, and facilitate adaptation to different environmental scenes. Moreover, the cross-sectional area of the noise reduction structure 12 continuously changes, which can facilitate more stable noise reduction adjustment, gradually increase or decrease the noise reduction depth, achieve multi-stage noise reduction effect, and make the adjustment more convenient and reliable.

[0061] In some embodiments, the sound outlet 11c is located between the first sound inlet 11d and the second sound inlet 11e in a planar projection parallel to the first direction.

[0062] In this embodiment, the sound outlet 11c is located at the middle position between the first sound inlet 11d and the second sound inlet 11e, rather than being biased to one side. In this way, the sound entering from the first sound inlet 11d and the second sound inlet 11e can have similar propagation paths and distances before reaching the sound outlet 11c, thereby achieving balanced and uniform distribution of sound. At the same time, when the noise reduction structure 12 adjusts the cross-sectional area of the first sound channel 11a, the amount of sound entering from the first sound inlet 11d and the second sound inlet 11e can be more accurately controlled, thereby achieving more effective noise reduction effect.

[0063] In some embodiments, the noise reduction structure 12 can move through the first sound channel 11a along the first direction relative to the elastic sound tube 11.

[0064] That is, in this embodiment, the movement mode of the noise reduction structure 12 is moving, and at this time, the first direction is a straight line direction. The user can adjust the position of the noise reduction structure 12 through a simple moving operation, and the operation mode is intuitive and easy to understand, and the operation convenience is high. At the same time, the structure of the noise reduction structure 12 can also be more simple, and the manufacturing difficulty of the noise reduction structure 12 is reduced.

[0065] Exemplarily, the noise reduction structure 12 can be roughly conical.

[0066] In some embodiments, referring to Figures 1 to 4 , the noise reduction structure 12 can pass through the first sound passage 11a along the first direction around the axis in a rotating manner relative to the elastic sound tube 11.

[0067] That is, in this embodiment, the movement mode of the noise reduction structure 12 is rotating. At this time, the first direction is a circumferential direction. Rotational adjustment can increase the stability of the cooperation between the noise reduction structure 12 and the first sound passage 11a, so that the noise reduction structure 12 is not easy to come out, and the operation of the rotational adjustment is also more convenient, and the tightness adjustment is facilitated. At the same time, it can also make the structure of the earplug 1 more compact.

[0068] In some embodiments, referring to Figures 1 to 4 , the noise reduction structure 12 is in an arc-shaped curved shape.

[0069] In this embodiment, the arc-shaped curved noise reduction structure 12 can facilitate the rotation of the noise reduction structure 12 to achieve noise reduction adjustment, and the arc-shaped structure can also reduce the rotation resistance, increase the rotation reliability, and reduce the overall structure size of the earplug 1, facilitating the miniaturization design of the earplug 1.

[0070] In some embodiments, referring to Figures 1 to 4 , along the first direction, the outer surface of the noise reduction structure 12 is provided with a plurality of adjustment scales 121.

[0071] In this embodiment, the adjustment scale 121 is provided to facilitate the user to provide an indication. When adjusting the noise reduction structure 12, the user can know the current noise reduction degree according to the adjustment scale 121, and adjust to the required noise reduction position according to the adjustment scale 121, so as to realize the accuracy of noise reduction adjustment and increase the user experience.

[0072] It can be understood that the second sound passage 11b can transmit the sound of the first sound passage 11a to the sound outlet 11c, and the second sound passage 11b can optimize the transmission path of the sound, reduce unnecessary sound reflection and resonance, and keep the process of transmitting the sound or audio source from the external environment to the user's ear canal high quality.

[0073] The second sound passage 11b can be an equal-diameter passage or a non-equal-diameter passage, which is not limited here.

[0074] Exemplarily, in some embodiments, the cross-sectional area of the second sound passage 11b is constant along a direction close to the sound outlet 11c.

[0075] In this embodiment, the second sound passage 11b is an equal-diameter passage, which can make the transmission of sound more uniform and increase the stability of transmission.

[0076] In other embodiments, please refer to Figure 4 , the cross-sectional area of the second sound passage 11b gradually increases along a direction close to the sound outlet 11c.

[0077] That is, the cross-sectional area of the second sound passage 11b close to the sound outlet 11c is larger than that far from the sound outlet 11c. In this way, the closer to the user's ear canal, the larger the cross-sectional area of the second sound passage 11b, which on the one hand can better form a physical barrier to reduce the entry of external noise and improve the passive noise reduction effect, and the gradually increasing cross-sectional area can gradually absorb more sound wave energy and reduce the transmission of noise; on the other hand, the gradually increasing cross-sectional area is helpful for the propagation of low-frequency sound, optimizes the balance of low-frequency, medium-frequency and high-frequency sound, and reduces unnecessary sound wave reflection and resonance.

[0078] In some embodiments, please refer to Figures 2 to 4 , the earplug 1 comprises an acoustic mesh 14, and the acoustic mesh 14 covers the sound outlet 11c.

[0079] In this embodiment, the acoustic mesh 14 can reduce the reflection of sound waves at the sound outlet 11c, make the propagation of sound in the ear canal more uniform, and improve the sound quality. Moreover, the acoustic mesh 14 can serve as an additional physical barrier to further reduce the entry of external noise and improve the passive noise reduction effect, and at the same time, the acoustic mesh 14 can also filter high-frequency noise and improve the purity of sound.

[0080] In some embodiments, please refer to Figures 2 to 4 , along a direction close to the first sound passage 11a, the elastic sound tube 11 comprises a first tube segment 111, a second tube segment 112 and a third tube segment 113, the space in the first tube segment 111, the second tube segment 112 and the third tube segment 113 defines at least part of the second sound passage 11b, the outer diameter of the second tube segment 112 is smaller than the outer diameter of the first tube segment 111 and the outer diameter of the third tube segment 113; the ear cap 13 is provided with a first mounting hole 13a and a second mounting hole 13b in communication, and the hole diameter of the first mounting hole 13a is smaller than the hole diameter of the second mounting hole 13b.

[0081] The outer diameter of the first tube segment 111 is larger than the hole diameter of the first mounting hole 13a, the first tube segment 111 is arranged in the second mounting hole 13b through the first mounting hole 13a, and the second tube segment 112 is arranged in the first mounting hole 13a.

[0082] In this embodiment, the first tube segment 111 is arranged in the second mounting hole 13b, and the second tube segment 112 is arranged in the first mounting hole 13a by cooperation of the first tube segment 111, the second tube segment 112, the third tube segment 113, the first mounting hole 13a and the second mounting hole 13b. The first tube segment 111 can pass through the first mounting hole 13a into the second mounting hole 13b due to its elastic property, and the first mounting hole 13a can limit the first tube segment 111 to reduce the probability of the first tube segment 111 coming out of the ear cap 13. The second tube segment 112 is arranged in the first mounting hole 13a, and the third tube segment 113 can also limit the elastic sound tube 11 to increase the stability of the connection between the elastic sound tube 11 and the ear cap 13.

[0083] In some embodiments, the elastic sound tube 11 is a transparent member.

[0084] The transparent member is a structure that can allow light to pass through and provide a clear view. That is, the transparent design of the elastic sound tube 11 can allow the user to observe the noise reduction structure 12, which facilitates the determination of the noise reduction position of the noise reduction structure 12. In the embodiment in which the outer surface of the noise reduction structure 12 is provided with the adjustment scale 121, the transparent elastic sound tube 11 can facilitate the accurate positioning of the noise reduction position of the noise reduction structure 12, thereby achieving precise adjustment. At the same time, the transparent elastic sound tube 11 can also facilitate the confirmation of the cooperation between the ear cap 13 and the elastic sound tube 11, which is convenient for maintenance and replacement.

[0085] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present application and the features of different embodiments or examples can be combined by those skilled in the art without contradiction.

[0086] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An earplug, characterized in that The earplug comprises: an elastic sound tube, a channel in the elastic sound tube comprising a first sound channel and a second sound channel in communication with each other, the first sound channel being in communication with the second sound channel and an external environment, the elastic sound tube having a sound outlet in communication with an end of the second sound channel away from the first sound channel; a noise reduction structure movably arranged in the first sound channel along a first direction; an ear cap arranged on an end of the elastic sound tube away from the noise reduction structure and in communication with the sound outlet; wherein along the first direction, a cross-sectional area of the noise reduction structure increases or decreases, so that the first sound channel expands or shrinks, to adjust an amount of sound entering the first sound channel and achieve noise reduction, the first direction being parallel to an extension direction of the first sound channel.

2. The earplug according to claim 1, wherein The elastic sound tube is provided with a first sound inlet and a second sound inlet arranged on opposite sides of the first sound channel along the first direction, for communication between the first sound channel and the external environment, along the first direction, the cross-sectional area of the noise reduction structure gradually increases towards the first sound inlet.

3. The earplug of claim 2, wherein, In an orthographic projection along a plane parallel to the first direction, the sound outlet is located between the first sound inlet and the second sound inlet.

4. The earplug of claim 1, wherein The noise reduction structure is movably arranged in the first sound channel along the first direction relative to the elastic sound tube.

5. The earplug of claim 1, wherein, The noise reduction structure is rotatably arranged in the first sound channel along the first direction relative to the elastic sound tube.

6. The earplug of claim 5, wherein, The noise reduction structure is in an arc shape.

7. The earplug of claim 4 or 5, wherein, Along the first direction, a plurality of adjustment scales are arranged at intervals on an outer surface of the noise reduction structure.

8. The earplug of claim 1, wherein, The cross-sectional area of the second sound channel is constant; or, along a direction towards the sound outlet, the cross-sectional area of the second sound channel gradually increases.

9. The earplug of claim 1, wherein, The earplug comprises an acoustic mesh arranged on the sound outlet.

10. The earplug of claim 1, wherein, Along a direction towards the first sound channel, the elastic sound tube comprises a first tube segment, a second tube segment and a third tube segment, spaces in the first tube segment, the second tube segment and the third tube segment defining at least a part of the second sound channel, an outer diameter of the second tube segment being smaller than an outer diameter of the first tube segment and an outer diameter of the third tube segment; the ear cap is provided with a first mounting hole and a second mounting hole in communication, a hole diameter of the first mounting hole being smaller than a hole diameter of the second mounting hole; The outer diameter of the first tube segment is greater than the hole diameter of the first mounting hole, the first tube segment is arranged in the second mounting hole through the first mounting hole, and the second tube segment is arranged in the first mounting hole.

11. The earplug of claim 1, wherein, The elastic sound tube is a transparent piece.

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