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CN-121971233-A - Sound-insulation breathable earplug based on acoustic labyrinth

CN121971233ACN 121971233 ACN121971233 ACN 121971233ACN-121971233-A

Abstract

The invention discloses a sound-insulation ventilation earplug based on an acoustic labyrinth, which relates to the technical field of earplugs and comprises a framework, wherein a through air guide groove is formed in one end of the framework, an acoustic labyrinth is arranged in the other end of the framework, an acoustic labyrinth outlet is formed in one side of the acoustic labyrinth, which faces the air guide groove, and is communicated with the air guide groove, an acoustic labyrinth inlet is formed in one side of the acoustic labyrinth, which faces away from the air guide groove, and labyrinth channels nested layer by layer are formed in the acoustic labyrinth, and the acoustic labyrinth inlet is communicated with the acoustic labyrinth outlet through the labyrinth channels. The invention communicates two sides of the earplug by the labyrinth cavity, has good air permeability, so that the earplug is more comfortable to wear, and simultaneously realizes ultra-wideband sound insulation through the synergistic effect of three mechanisms of thermal viscous sound loss, sound wave reflection and resonance sound absorption, improves the sound transmission loss and enhances the sound insulation effect.

Inventors

  • LI CHENG
  • LIU YANG
  • ZHOU JIANKUN

Assignees

  • 北京航空航天大学

Dates

Publication Date
20260505
Application Date
20260204

Claims (8)

  1. 1. The sound-insulation ventilation earplug based on the acoustic labyrinth is characterized by comprising a framework (1), wherein a through air guide groove (7) is arranged in one end of the framework (1); An acoustic labyrinth (2) is arranged in the other end of the framework (1), an acoustic labyrinth outlet (5) is arranged on one side, facing the air guide groove (7), of the acoustic labyrinth (2), the acoustic labyrinth outlet (5) is communicated with the air guide groove (7), and an acoustic labyrinth inlet (4) is arranged on one side, facing away from the air guide groove (7), of the acoustic labyrinth (2); The acoustic labyrinth is characterized in that a labyrinth cavity (6) nested layer by layer is arranged in the acoustic labyrinth (2), and the acoustic labyrinth inlet (4) is communicated with the acoustic labyrinth outlet (5) through the labyrinth cavity (6).
  2. 2. The acoustic labyrinth-based sound-and air-permeable earplug according to claim 1, characterized in that the acoustic labyrinth (2) comprises a labyrinth body (2-1) and an end cap (2-2); A first groove (2-2-1) is formed in the lower surface of the end cover (2-2), the acoustic labyrinth inlet (4) is formed in the center of the upper surface of the end cover (2-2), the acoustic labyrinth inlet (4) is communicated with the first groove (2-2-1), and the labyrinth main body (2-1) is embedded in the first groove (2-2-1); The labyrinth cavity (6) and the acoustic labyrinth outlet (5) are both arranged on the labyrinth main body (2-1).
  3. 3. The acoustic labyrinth-based sound-insulating and breathable earplug according to claim 2, characterized in that the upper surface of the labyrinth body (2-1) is provided with annular grooves (2-1-1) nested layer by layer, the side walls of the annular grooves (2-1-1) are provided with side holes (2-1-2), and the side holes (2-1-2) are communicated with adjacent annular grooves (2-1-1); the acoustic labyrinth outlet (5) is arranged in the annular groove (2-1-1) of the outermost layer; the annular groove (2-1-1), the side hole (2-1-2) and the inner surface of the end cover (2-2) are enclosed to form the labyrinth cavity (6).
  4. 4. An acoustic labyrinth based sound and air permeable earplug according to claim 3, characterized in that the upper surface center of the labyrinth body (2-1) is provided with a labyrinth inlet (2-1-3), the labyrinth inlet (2-1-3) is located at the innermost ring of the annular groove (2-1-1), the acoustic labyrinth inlet (4) is aligned with the labyrinth inlet (2-1-3); the labyrinth inlet (2-1-3) communicates with the adjacent annular groove (2-1-1) via the side hole (2-1-2).
  5. 5. An acoustic labyrinth based sound and air permeable earplug as set forth in claim 3 wherein said side holes (2-1-2) in the side walls of two adjacent said annular grooves (2-1-1) are angularly offset from each other.
  6. 6. The acoustic labyrinth-based sound-insulating breathable earplug of claim 1, wherein the skeleton (1) comprises an outer ear end (1-1) and an inner ear end (1-2), the acoustic labyrinth (2) is disposed within the outer ear end (1-1), and the air guide groove (7) is disposed within the inner ear end (1-2).
  7. 7. The acoustic labyrinth-based sound-and-air-permeable earplug as set forth in claim 6, wherein the outside of the ear-in end (1-2) is covered with a cushion pad (3).
  8. 8. The acoustic labyrinth-based sound-insulating and breathable earplug according to claim 6, characterized in that a second groove (1-1-1) and a third groove (1-1-2) are provided in the outer ear end (1-1) in communication with each other, the third groove (1-1-2) being located below the second groove (1-1-1), the acoustic labyrinth (2) being embedded in the second groove (1-1-1); The acoustic labyrinth outlet (5) is communicated with the air guide groove (7) through the third groove (1-1-2).

Description

Sound-insulation breathable earplug based on acoustic labyrinth Technical Field The invention relates to the technical field of earplugs, in particular to a sound-insulation breathable earplug based on an acoustic labyrinth. Background In the modern society, noise pollution can negatively affect the physiology and psychology of human body. World health organizations estimated that more than 15 hundred million people worldwide are at risk of hearing loss due to noise exposure, and wearing sound-insulating earplugs is one of the important preventive measures. The problem of noise pollution requires that the sound-insulating earplug has excellent air permeability, high sound transmission loss, wideband sound insulation and other comprehensive properties. The prior patent with the publication number of CN221431353U discloses an electrodeless regulation sound insulation earplug, the technology comprises a plug body, one end of the plug body is connected with a noise reduction knob in a threaded mode and extends to the inside of the plug body, a plug head is clamped on the outer wall of the other end of the plug body, a sound guide groove penetrating through the plug body is formed in the middle of the plug body, a sound filtering film is arranged at the end portion, close to the plug head, of the sound guide groove, threads matched with the noise reduction knob are arranged on the inner wall, close to the noise reduction knob, of the sound guide groove, the transmission of blocking or reflecting sound waves can be controlled through the noise reduction knob, the transmission of partial frequency, particularly middle-low frequency noise is effectively controlled, the sound insulation bandwidth is increased, however, the sound insulation earplug is of a fully-closed structure, the ventilation property is poor, in addition, air in an ear canal can be compressed in the process of a user plugging the sound insulation earplug into the ear canal, the eardrum is easy to squeeze the eardrum, and wearing comfort of the user is reduced. Accordingly, the prior art soundproof earplug has limitations in terms of both breathability and soundproof frequency bands. Disclosure of Invention The invention aims to provide a sound-insulating and breathable earplug based on an acoustic labyrinth, which solves the problems mentioned in the background art. The invention adopts the following technical scheme: The invention relates to a sound-insulation breathable earplug based on an acoustic labyrinth, which comprises a framework, wherein a through air guide groove is arranged in one end of the framework; An acoustic labyrinth is arranged in the other end of the framework, an acoustic labyrinth outlet is arranged on one side, facing the air guide groove, of the acoustic labyrinth, the acoustic labyrinth outlet is communicated with the air guide groove, and an acoustic labyrinth inlet is arranged on one side, facing away from the air guide groove, of the acoustic labyrinth; the acoustic labyrinth is characterized in that a labyrinth cavity which is nested layer by layer is arranged in the acoustic labyrinth, and the inlet of the acoustic labyrinth is communicated with the outlet of the acoustic labyrinth through the labyrinth cavity. Preferably, the acoustic labyrinth comprises a labyrinth body and an end cap; A first groove is formed in the lower surface of the end cover, the acoustic labyrinth inlet is formed in the center of the upper surface of the end cover, the acoustic labyrinth inlet is communicated with the first groove, and the labyrinth main body is embedded in the first groove; The labyrinth channel and the acoustic labyrinth outlet are both arranged on the labyrinth main body. Preferably, the upper surface of the labyrinth main body is provided with annular grooves nested layer by layer, the side wall of the annular groove is provided with a side hole, and the side hole is used for communicating the adjacent annular grooves; the acoustic labyrinth outlet is arranged in the annular groove of the outermost layer; the annular groove, the side holes and the inner surface of the end cover are enclosed to form the labyrinth cavity. Preferably, a labyrinth inlet is arranged at the center of the upper surface of the labyrinth main body, the labyrinth inlet is positioned at the innermost ring of the annular groove, and the acoustic labyrinth inlet is aligned with the labyrinth inlet; The labyrinth inlet communicates with the adjacent annular groove via the side hole. Preferably, the side holes on the side walls of two adjacent annular grooves are staggered at a certain angle. Preferably, the skeleton comprises an outer ear end and an inner ear end, the acoustic labyrinth is arranged in the outer ear end, and the air guide groove is arranged in the inner ear end. Preferably, a buffer pad is sleeved outside the ear-in end. Preferably, a second groove and a third groove which are communicated with each other are arranged in the outer end