Hearing protection device

Abstract

The utility model provides a kind of hearing protection device, it includes headband and two earmuffs respectively connected in the both ends of the headband, the earmuff includes shell and sound-absorbing layer arranged in the shell;The sound-absorbing layer is formed by three-dimensional porous support and air adsorption material filled in the three-dimensional porous support, the pore volume of the sound-absorbing layer is 0.1cm 3 / g-0.6cm 3 / g.The utility model can solve the problem that the current hearing protection device has poor absorption effect on low-frequency sound waves and high noise, enhance the sound insulation effect of the hearing protection device, and improve the wearing comfort of the hearing protection device.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction technology, and in particular to a hearing protection device. Background Technology

[0002] Currently, hearing protection devices using passive noise reduction technology still face some challenges in the field of sound insulation and noise reduction. Specifically:

[0003] Hearing protection devices are filled with traditional porous sound-absorbing materials, such as common sponges or sound-absorbing cotton. Although they have many pores, their sound absorption effect is mainly concentrated in the mid-to-high frequency range. They have low absorption efficiency for low-frequency sound waves because low-frequency sound waves are not easy to cause strong vibrations of air molecules in the pores and convert them into heat energy. As a result, a lot of low-frequency noise can still penetrate the device and enter the ear.

[0004] In the structural design of hearing protection devices, in pursuit of wearing comfort and portability, the internal cavity of the device is often not designed to be large enough, and it is also difficult to use thick sound-absorbing materials. This limits the further improvement of sound insulation capabilities, and in high-noise environments, the sound insulation capabilities cannot reach the ideal standard. Utility Model Content

[0005] The purpose of this invention is to provide a hearing protection device that solves the problem of poor absorption of low-frequency sound waves and high noise in current hearing protection devices, enhances the sound insulation effect of hearing protection devices, and thus improves the wearing comfort of hearing protection devices.

[0006] The above-mentioned technical objectives of this utility model are mainly achieved through the following technical solutions.

[0007] This utility model provides a hearing protection device, which includes a headband and two earmuffs respectively connected to both ends of the headband. Each earmuff includes a housing and a sound-absorbing layer disposed within the housing. The sound-absorbing layer is formed by a three-dimensional porous support and an air-absorbing material filled within the three-dimensional porous support, and the pore volume of the sound-absorbing layer is 0.1 cm³. 3 / g-0.6cm 3 / g.

[0008] In a preferred embodiment of this invention, the density of the sound-absorbing layer is less than 0.3 g / cm³. 3 The preferred value is 0.2 g / cm³. 3 .

[0009] In a preferred embodiment of this utility model, the thickness of the sound-absorbing layer is greater than 5 mm.

[0010] In a preferred embodiment of this utility model, the micropores in the air adsorption material have a diameter of 0.3nm-0.7nm, the mesopores have a diameter of 10nm-30nm, and the macropores have a diameter of 0.5μm-100μm.

[0011] In a preferred embodiment of the present invention, the housing has a soundproof chamber with an opening on one side, and the sound-absorbing layer is located inside the soundproof chamber and is bonded or snapped to the inner wall surface of the housing.

[0012] In a preferred embodiment of the present invention, the outer wall of the housing is rotatably connected to the end of the headband via a connecting pin.

[0013] In a preferred embodiment of the present invention, a sealing gasket is provided on the edge of the opening of the housing.

[0014] In a preferred embodiment of the present invention, the sealing gasket includes a damping gasket and a soft gasket, the damping gasket being formed on the edge of the opening of the housing, and the soft gasket being wrapped around the outer periphery of the damping gasket.

[0015] In a preferred embodiment of the present invention, the soft gasket includes an inner layer and an outer layer stacked on top of each other. The inner layer is made of at least one of memory foam, foam, silicone, sound-absorbing cotton, and sound-insulating cotton, and the outer layer is made of at least one of synthetic leather, cotton cloth, velvet, and protein leather.

[0016] In a preferred embodiment of the present invention, the headband includes an arc-shaped headband body and two elastic connecting supports respectively connected to both ends of the headband body, the elastic connecting supports being connected to the earmuffs.

[0017] In a preferred embodiment of the present invention, the sound-absorbing layer is attached to the inner surface of the housing, and at least one side of the sound-absorbing layer is consistent with the shape of the inner surface of the housing.

[0018] In a preferred embodiment of the present invention, the three-dimensional porous support includes at least one of open-cell foam, electrospun fiber material, melamine foam and polyurethane foam.

[0019] In a preferred embodiment of the present invention, the air adsorption material includes at least one of silicon-based zeolite material and powdered activated carbon.

[0020] Compared with the prior art, the technical solution of this utility model has the following features and advantages:

[0021] The hearing protection device described in this invention features a sound-absorbing layer with a combined structure of a three-dimensional porous support and air-absorbing material. Its sound insulation effect is evident across the entire frequency range, showing some effectiveness even at low frequencies. Particularly in the 2000Hz-4000Hz frequency range, the sound insulation is significantly increased, and the peak sound level is greatly reduced. Since 2000Hz-4000Hz falls within the most sensitive frequency range for the human ear, a substantial increase in sound insulation within this range yields a multiplier effect. Furthermore, the sound-absorbing layer in this invention exhibits superior sound insulation performance in the mid-to-high frequency range compared to traditional porous materials (such as sound-absorbing cotton). Simultaneously, the sound-absorbing layer itself possesses excellent expansion capabilities (due to the microporous structure within the air-absorbing material), which can alleviate discomfort caused by excessive ear pressure, providing better wearing comfort for users who wear it for extended periods. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0023] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0024] Figure 1 This is a schematic diagram of the hearing protection device described in this utility model;

[0025] Figure 2 This is a schematic diagram of the sound-absorbing layer of this utility model;

[0026] Figure 3 This is a schematic diagram showing the test results of the hearing protection device of this utility model compared to the prior art;

[0027] Figure 4 This is a schematic diagram showing the test results of sound-absorbing layers with different densities.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Headband; 11. Headband body; 12. Elastic connecting support;

[0030] 20. Earcups; 21. Shell; 211. Connecting pin; 22. Sound-absorbing layer; 23. Damping washer; 24. Soft washer. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0032] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0033] 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 invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] This utility model provides a hearing protection device, such as Figure 1 and Figure 2 As shown, it includes a headband 10 and two earmuffs 20 respectively connected to both ends of the headband 10. Each earmuff 20 includes a housing 21 and a sound-absorbing layer 22 disposed within the housing 21. The sound-absorbing layer 22 is formed by a three-dimensional porous support and an air-absorbing material filled within the three-dimensional porous support. The pore volume of the sound-absorbing layer 22 is 0.1 cm³. 3 / g-0.6cm 3 / g.

[0035] The hearing protection device described in this utility model features a sound-absorbing layer 22 with a combined structure of a three-dimensional porous support and air-absorbing material. Its sound insulation effect is evident across the entire frequency range, showing some effectiveness even at low frequencies. Particularly in the 2000Hz-4000Hz frequency range, the sound insulation is significantly increased, and the peak value is greatly reduced. Since 2000Hz-4000Hz falls within the range of frequencies most sensitive to the human ear, a substantial increase in sound insulation within this frequency range yields twice the result with half the effort. The sound-absorbing layer 22 in this utility model exhibits superior sound insulation performance in the mid-to-high frequency range compared to traditional porous materials (such as sponge). Compared to traditional porous materials, using the sound-absorbing layer 22 in this utility model can reduce the thickness by 10%-30% while achieving the same sound insulation effect. This allows the overall thickness of the sound insulation portion of the hearing protection device to be reduced by 10%-30%. Meanwhile, the sound-absorbing layer 22 in this invention has a good expansion effect (microporous structure inside the air adsorption material), which can alleviate the discomfort caused by excessive ear pressure and provide better wearing comfort for users who wear it for a long time.

[0036] The following will provide a detailed description of the specific structure of each part of the hearing protection device described in this utility model, as well as the position and connection relationship between each part.

[0037] The hearing protection device described in this utility model has a headband 10, such as Figure 1 As shown, the headband 10 is an arc-shaped component that conforms to the shape of the head. When worn, the headband 10 can rest against the head to help fix the hearing protection device, while allowing the two earmuffs 20 to fit tightly against the ears.

[0038] Better, such as Figure 1 As shown, the headband 10 includes an arc-shaped headband body 11 and two elastic connecting supports 12 respectively connected to both ends of the headband body 11. The elastic connecting supports 12 are connected to the earmuffs 20. By setting the elastic connecting supports 12, the headband 10 can undergo elastic deformation under the action of external force, which facilitates the wearing of the hearing protection device and also makes it suitable for different head sizes, thereby improving the practicality of the hearing protection device.

[0039] The hearing protection device described in this utility model also has two earmuffs 20, such as Figure 1 and Figure 2As shown, two earmuffs 20 are respectively connected to both ends of the headband 10; each earmuff 20 includes a shell 21 and a sound-absorbing layer 22 disposed within the shell 21; the shell 21 is used to block external noise from entering the ear, and the sound-absorbing layer 22 further provides full-frequency sound insulation. The shell 21 forms a sound-insulating chamber with an opening on one side, and the sound-absorbing layer 22 is located inside the sound-insulating chamber and is bonded or snapped to the inner wall surface of the shell 21; the sound-absorbing layer 22 is attached to the inner surface of the shell 21, and at least one side of the sound-absorbing layer 22 has the same shape as the inner surface of the shell 21. In this embodiment, the shell 21 and the sound-absorbing layer 22 are hemispherical structures with the same shape; the shape of the shell 21 and the sound-absorbing layer 22 can also be other shapes with an opening at one end, as long as a relatively sealed space can be formed around the ear.

[0040] The sound-absorbing layer 22 comprises a three-dimensional porous support and an air-absorbing material, which can be granular and filled within the three-dimensional porous support. The three-dimensional porous support includes at least one of open-cell foam, electrospun fiber material, melamine foam, and polyurethane foam; the air-absorbing material includes at least one of silica-based zeolite material and powdered activated carbon. Specifically, the structure of the sound-absorbing layer 22 can be selected from the three-dimensional air-absorbing structure disclosed in Chinese invention patent CN105189630B, entitled "Three-Dimensional Air-Adsorption Structure". The sound-absorbing layer 22 can also be a CF01 product purchased from Best.

[0041] The structure and technical effects of the preferred embodiment of the hearing protection device of this utility model will be further described below.

[0042] According to one embodiment of the present invention, the density of the sound-absorbing layer 22 is less than 0.3 g / cm³. 3 The preferred value is 0.2 g / cm³. 3 .

[0043] According to one embodiment of the present invention, the thickness of the sound-absorbing layer 22 is greater than 5 mm.

[0044] According to one embodiment of the present invention, the micropore diameter in the air adsorption material is 0.3nm-0.7nm, the mesopore diameter in the air adsorption material is 10nm-30nm, and the macropore diameter in the air adsorption material is 0.5μm-100μm.

[0045] According to one embodiment of the present invention, such as Figure 1 As shown, the outer wall of the housing 21 is rotatably connected to the end of the headband 10 via a connecting pin 211; the left and right earcups 20 are rotatably connected to the headband 10, and the wearer can adjust the angle of the earcups 20 according to the shape of their head, thereby improving wearing comfort.

[0046] According to one embodiment of the present invention, a sealing gasket is provided on the edge of the opening of the housing 21; the sealing gasket fits tightly against the ear to prevent noise from entering the ear through the gap.

[0047] Specifically, such as Figure 1 As shown, the sealing gasket includes a damping washer 23 and a soft washer 24. The damping washer 23 is formed on the edge of the opening of the housing 21. The damping washer 23 can be integrally formed with the housing 21, or it can be ultrasonically welded to the housing 21. The soft washer 24 consists of an outer layer and an inner layer. The outer layer material can directly contact the skin and needs to provide a certain degree of comfort. Common materials include synthetic leather, cotton, fleece, protein leather, etc. The inner layer material can enhance the sealing performance and needs to consider the comfort of long-term wear. Common materials include memory foam, foam, silicone, sound-absorbing cotton, sound-insulating cotton, etc. The outer layer material covers the surface of the inner layer material. The soft washer 24 is tightly wrapped around the outside of the damping washer 23 through structural components.

[0048] To further verify the sound insulation effect of the hearing protection device described in this utility model, a specific sound insulation effect test was conducted.

[0049] Two sets of comparative examples were set up for comparison testing with the technical solution of this utility model. The two sets of comparative examples used the same headband 10 and earmuffs 20 as this utility model. The difference is that one set of earmuffs 20 does not have a corresponding sound-absorbing layer 22 (empty), while the other set of earmuffs 20 has a sound-absorbing layer formed by traditional porous sound-absorbing material (sponge), and the thickness of the traditional porous sound-absorbing material sound-absorbing layer is the same as the thickness of the sound-absorbing layer 22 described in this utility model.

[0050] The hearing protection devices corresponding to the three sets of tests were fixed to the artificial ears connected to wireless receivers (APs). A noise source was placed at a fixed position in front of the artificial ear to play noise. The AP received the sound signal, and the audio processing software analyzed the sound signal to obtain the corresponding frequency response curve. The specific test results are as follows: Figure 3 As shown.

[0051] from Figure 3 It can be seen that the sound-absorbing layer 22 in this invention also shows a certain effect in the low frequency range, especially in the 2000Hz-4000Hz frequency range, where the sound insulation is significantly increased and the peak value is greatly reduced. Moreover, the sound-absorbing layer 22 in this invention has a better sound insulation effect in the mid-to-high frequency range than traditional porous materials. Therefore, it can be seen that the hearing protection device described in this invention can play a good sound insulation role in the entire frequency range, and the user experience is significantly better than that of traditional porous materials.

[0052] To further verify the sound absorption effect of the hearing protection device of this utility model using sound-absorbing layers 22 of different densities, a cavity of a hearing protection device without sound-absorbing layers 22 was used as a comparative example. Two sets of embodiments and one set of comparative examples were also provided for comparison and analysis with the cavity. The parameters of the sound-absorbing layers 22 in the three sets are as follows:

[0053] First example: pore volume 0.6cm 3 / g, micropore diameter 0.3nm-0.7nm, mesopore diameter 10nm-30nm, macropore diameter 0.5μm-100μm, density 0.15g / cm³ 3 .

[0054] Second example: pore volume 0.1cm 3 / g, micropore diameter 0.3nm-0.7nm, mesopore diameter 10nm-30nm, macropore diameter 0.5μm-100μm, density 0.3g / cm³ 3 .

[0055] Comparative example group: pore volume 0.05 cm³ 3 / g, micropore diameter 0.3nm-0.7nm, mesopore diameter 10nm-30nm, macropore diameter 0.5μm-100μm, density 0.4g / cm³ 3 .

[0056] The cavity, the two sets of embodiment-specific hearing protection devices, and the set of comparative-specific devices were respectively fixed to the artificial ear connected to the wireless receiver box (AP). A noise source was placed at a fixed position in front of the artificial ear to play noise. The AP received the sound signal, and the audio processing software analyzed the sound signal to obtain the corresponding frequency response curve. The test results are as follows. Figure 4 As shown.

[0057] from Figure 4 It can be seen that the filling has a density of 0.15 g / cm³. 3 The sound-absorbing layer 22 corresponds to the hearing protection device with the best sound absorption effect; it is filled with a density of 0.3 g / cm³. 3 The sound absorption effect of the hearing protection device corresponding to the sound-absorbing layer 22 is secondary; it is filled with a density of 0.4 g / cm³. 3 The sound absorption effect of the hearing protection device corresponding to the sound-absorbing layer 22 is worse than that of the cavity.

[0058] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A hearing protection device, characterized in that, The device includes a headband (10) and two earmuffs (20) connected to both ends of the headband (10). Each earmuff (20) includes a housing (21) and a sound-absorbing layer (22) disposed within the housing (21). The sound-absorbing layer (22) is formed by a three-dimensional porous support and an air-absorbing material filled within the three-dimensional porous support. The pore volume of the sound-absorbing layer (22) is 0.1 cm. 3 / g-0.6cm 3 / g.

2. The hearing protection device according to claim 1, characterized in that, The density of the sound-absorbing layer (22) is less than 0.3 g / cm³. 3 .

3. The hearing protection device according to claim 2, characterized in that, The density of the sound-absorbing layer (22) is less than 0.2 g / cm³. 3 .

4. The hearing protection device according to claim 1, characterized in that, The thickness of the sound-absorbing layer (22) is greater than 5 mm.

5. The hearing protection device according to claim 1, characterized in that, The air adsorption material has micropores with a diameter of 0.3 nm to 0.7 nm, mesopores with a diameter of 10 nm to 30 nm, and macropores with a diameter of 0.5 μm to 100 μm.

6. The hearing protection device according to claim 1, characterized in that, The housing (21) forms a soundproof chamber with an opening on one side, and the sound-absorbing layer (22) is located inside the soundproof chamber and is bonded or snapped to the inner wall surface of the housing (21).

7. The hearing protection device according to claim 1 or 6, characterized in that, The outer wall of the housing (21) is rotatably connected to the end of the headband (10) by a connecting pin (211).

8. The hearing protection device according to claim 6, characterized in that, A sealing gasket is provided on the edge of the opening of the housing (21).

9. The hearing protection device according to claim 8, characterized in that, The sealing gasket includes a damping washer (23) and a soft washer (24). The damping washer (23) is formed on the edge of the opening of the housing (21), and the soft washer (24) is wrapped around the outer periphery of the damping washer (23).

10. The hearing protection device according to claim 9, characterized in that, The soft pad (24) includes an inner layer and an outer layer stacked on top of each other. The inner layer is made of at least one of memory foam, foam, silicone, sound-absorbing cotton and sound-insulating cotton, and the outer layer is made of at least one of synthetic leather, cotton cloth, velvet and protein leather.

11. The hearing protection device according to claim 1, characterized in that, The headband (10) includes an arc-shaped headband body (11) and two elastic connecting supports (12) respectively connected to both ends of the headband body (11), and the elastic connecting supports (12) are connected to the earmuffs (20).

12. The hearing protection device according to claim 1, characterized in that, The sound-absorbing layer (22) is attached to the inner surface of the housing (21), and at least one side of the sound-absorbing layer (22) is consistent with the shape of the inner surface of the housing (21).

13. The hearing protection device according to claim 1, characterized in that, The three-dimensional porous scaffold includes at least one of open-cell foam, electrospun fiber material, melamine foam, and polyurethane foam.

14. The hearing protection device according to claim 1, characterized in that, The air adsorption material includes at least one of silicon-based zeolite material and powdered activated carbon.

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