CN107750021B - Muffler and noise reduction earplug comprising same - Google Patents
Muffler and noise reduction earplug comprising same Download PDFInfo
- Publication number
- CN107750021B CN107750021B CN201710937801.4A CN201710937801A CN107750021B CN 107750021 B CN107750021 B CN 107750021B CN 201710937801 A CN201710937801 A CN 201710937801A CN 107750021 B CN107750021 B CN 107750021B
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- 230000009467 reduction Effects 0.000 title abstract description 8
- 230000003584 silencer Effects 0.000 claims abstract description 15
- 230000001629 suppression Effects 0.000 claims abstract description 5
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 210000005069 ears Anatomy 0.000 abstract description 4
- 239000000428 dust Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 210000000613 ear canal Anatomy 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1058—Manufacture or assembly
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
- G10K11/04—Acoustic filters ; Acoustic resonators
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
- H04R2201/105—Manufacture of mono- or stereophonic headphone components
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Manufacturing & Machinery (AREA)
- Signal Processing (AREA)
- Headphones And Earphones (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a silencer and a noise reduction earplug comprising the same, wherein the silencer comprises a plug body, a plug rod, a tuning pad and a plug cover, a sound collecting cavity is arranged at the far ear end of the plug body, an outwards extending chamfer is arranged at the edge of the sound collecting cavity, a conducting cavity is arranged in the plug body, the conducting cavity is arranged at the rear side of the sound collecting cavity, the conducting cavity is a cylinder or a reverse cone, the plug rod is plugged in the conducting cavity, the plug rod is attached to the conducting cavity, the plug rod is a cylinder or a cone, the tuning pad is arranged at the near ear end of the plug body, the plug cover is arranged at the end part of the near ear end of the plug body, the tuning pad is fixed between the plug cover and the tuning cavity, a through groove is formed on the outer surface of the plug rod along the axial direction, a noise suppression cavity is formed between the groove on the outer surface of the plug rod and the inner surface of the conducting cavity, and a sound outlet hole is formed on the plug cover. The invention can keep the sound intensity of the part which is needed within the reasonable range which can be obtained by human ears while isolating harmful noise.
Description
Technical Field
The invention relates to the technical field of silencers for filtering noise, in particular to a silencer and a noise reduction earplug comprising the silencer.
Background
At present, various requirements for hearing protection in life and work are becoming more and more common, and various conventional sponges and plastic earplugs can reduce the decibel value of various sounds. In the market, the penetration of sound waves is reduced through tiny holes so as to reduce the intensity of middle and high frequency sound, but the reduction of partial frequency, particularly middle and low frequency noise, cannot be effectively controlled due to the diffraction characteristic of the sound waves.
Disclosure of Invention
Aiming at the problems and the shortcomings in the prior art, the invention provides a silencer and a noise reduction earplug comprising the same, which can isolate harmful noise and keep the required partial sound intensity within a reasonable range which can be acquired by human ears.
The invention solves the technical problems by the following technical proposal:
the invention provides a silencer which is characterized by comprising a plug body, a plug rod, a tuning pad and a plug cover, wherein a sound collecting cavity is arranged at the far ear end of the plug body, a chamfer extending outwards is arranged at the edge of the sound collecting cavity, a conducting cavity is formed in the plug body, the conducting cavity is arranged at the rear side of the sound collecting cavity, the conducting cavity is a cylinder or a reverse cone, the plug rod is plugged in the conducting cavity, the plug rod is attached to the conducting cavity, the plug rod is a cylinder or a cone, the tuning cavity is arranged at the near ear end of the plug body, the plug cover is arranged at the end part of the near ear end of the plug body, the tuning pad is fixed between the plug cover and the tuning pad, a through groove is formed in the outer surface of the plug rod along the axial direction, a noise suppression cavity is formed between the groove on the outer surface of the plug rod and the inner surface of the conducting cavity, and a sound outlet hole is formed in the plug cover.
Preferably, a dust cover is arranged at the joint of the sound collecting cavity and the conducting cavity, the dust cover is tightly attached to the plug body or stuck to the plug body, at least one sound inlet hole is formed in the dust cover, the sound inlet holes are distributed on the surface of the dust cover, and the sound collecting cavity is communicated with the conducting cavity.
Preferably, the dust cover is mushroom-shaped, the dust cover is provided with a relatively large cover cap and a relatively thin elastic plug handle, the elastic plug handle is fixed with the cover cap, the cover cap covers the outer side of the conducting cavity, the elastic plug handle stretches into and is clamped in the conducting cavity, the sound inlet hole extends from the cover cap to the elastic plug handle, and the sound collecting cavity is communicated with the conducting cavity.
Preferably, the inner cavity of the elastic plug handle is hollow, the sound inlet holes are distributed on the inner side of the cap in a groove shape, and the sound inlet holes penetrate through the joint part of the elastic plug handle and the cap and extend into the hollow inner cavity of the elastic plug handle.
Preferably, the elastic plug handle is in a non-complete round shape, the sound inlet holes are distributed on the inner side of the cap in a groove shape, and the sound inlet holes penetrate through the joint part of the elastic plug handle and the cap and extend into the elastic plug handle.
Preferably, the conducting cavity is an inverted cone, the stopper rod is a cone, and the cone slope of the stopper rod is equal to the cavity cone slope of the conducting cavity; alternatively, the conducting cavity is a cylinder, and the stopper rod is a cone; or the conducting cavity is a cone, and the stopper rod is a cylinder; alternatively, the conduction cavity and the stopper rod are both cylinders.
Preferably, the large end of the conducting cavity is the near-ear end, the small end of the conducting cavity is the far-ear end, the large end of the stopper rod is the near-ear end, the small end of the stopper rod is the far-ear end, the diameter of the large end of the conducting cavity is 0.5-4 mm, the diameter of the small end of the conducting cavity is 0.5-4 mm, and the length of the conducting cavity is 5-25 mm.
Preferably, the diameter of the large end of the conducting cavity is 2mm, the diameter of the small end of the conducting cavity is 1.8mm, and the length of the conducting cavity is 12mm.
Preferably, the diameter of the stopper rod is matched with the inner diameter of the conduction cavity, and the length of the stopper rod is 1mm-25mm.
Preferably, the depth of the groove is 0.01 to 0.8mm.
Preferably, the diameter of the tuning cavity is 3-10 mm, the thickness of the tuning pad is 0.01-1 mm, and the diameter of the tuning pad is smaller than or equal to the diameter of the tuning cavity.
Preferably, a vibrating diaphragm is fixed at the near-ear end of the tuning cavity, the tuning pad is fixed at the far-ear end of the tuning cavity, and the vibrating diaphragm is a vibrating slice.
The invention also provides a noise-reducing earplug which is characterized by comprising the silencer and an earplug body, wherein the earplug body is provided with one or more layers of fins, the near-ear end of the silencer is inserted into an insertion hole of the earplug body, and the inner diameter of the insertion hole is smaller than the outer diameter of the near-ear end of the silencer.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The invention has the positive progress effects that:
the invention can keep the sound intensity of the part which is needed within the reasonable range which can be obtained by human ears while isolating harmful noise.
Drawings
Fig. 1 is an exploded view of a muffler according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural view of a muffler according to a preferred embodiment of the present invention.
Fig. 3 is a partial structural view of a muffler according to a preferred embodiment of the present invention.
Fig. 4 is a schematic structural view of a dust cap according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a dust cap according to another embodiment of the present invention.
Fig. 6 and 7 are schematic structural views of a dust cap according to a further embodiment of the present invention.
Fig. 8 and 9 are schematic structural views of a dust cap according to another embodiment of the present invention.
Fig. 10 and 11 are schematic structural views of a noise reduction earplug according to a preferred embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 3, the present embodiment provides a muffler, which is composed of a plug body 1, a plug rod 2, a tuning pad 3 and a plug cover 4. The far ear end of the plug body 1 is provided with a sound collecting cavity 101, and the edge of the sound collecting cavity 101 is provided with an outwards extending chamfer angle, so that external sound waves S1 can conveniently enter the silencer; a conducting cavity 102 is arranged at the rear side of the sound collecting cavity 101, and the conducting cavity 102 is a cylinder or a reverse cone; the conducting cavity 102 is internally provided with the stopper rod 2, and the stopper rod 2 is a cylinder or a cone. For a better fit, the conducting cavity 102 is preferably an inverted cone and the stopper rod 2 is preferably a cone. The near-ear end of the plug body 1 is provided with a tuning cavity 103, the plug cover 4 is covered on the end part of the near-ear end of the plug body 1, and the tuning pad 3 is fixed between the plug cover 4 and the tuning cavity 103.
The shape selection of the conducting cavity 102 and the stopper rod 2 is mainly based on the fact that the stopper rod 2 can be tightly attached after being plugged into the conducting cavity 102; when this condition of close fitting is met, the conductive cavity 102 may be a cylinder and the stopper rod 2 a cone; or the conducting cavity 102 may be a cone and the stopper rod 2 a cylinder; even more, the conduction cavity 102 and the stopper rod 2 are both cylinders; it is ensured that after the stopper rod 2 is inserted into the conduction cavity 102, the two wall surfaces can be closely attached to each other in the axial direction due to the extrusion action.
The diameter of the large end of the conducting cavity 102 is 0.5-4 mm, preferably 2mm; the diameter of the small end of the conducting cavity 102 is 0.5-4 mm, preferably 1.8mm; the length of the conductive cavity 102 is 5-25 mm, preferably 12mm.
The stopper rod 2 is a cylinder or a cone, preferably a cone, and the diameter of the stopper rod 2 is the same as the inner diameter of the conduction cavity 102; the length of the stopper rod 2 is 1mm-25mm, preferably 3mm-8mm; the outer surface of the stopper rod 2 is provided with a through groove 201 (see figure 1) along the axial direction; the depth of the groove 201 is 0.01 to 0.8mm, preferably 0.1 to 0.3mm depending on the actual use.
The taper of the stopper rod 2 is equal to the chamber taper of the conducting chamber 102; the small end of the stopper rod 2 is plugged into the conducting cavity 102 through the large end of the conducting cavity 102; the outer surface of the stopper rod 2 is closely attached to the inner surface of the conducting cavity 102; the grooves 201 on the outer surface of the stopper rod 2 form a noise suppressing cavity 5 with the inner surface of the conducting cavity 102. The external sound wave S1 enters the conducting cavity 102 through the sound collecting cavity 101 to form a sound wave S2; the external sound wave S1 enters the conducting cavity 102 through the sound collecting cavity 101 to form a sound wave S2; the sound wave S2 further propagates into the ear canal through the noise suppression cavity 5, and the noise suppression cavity 5 is relatively long and narrow, so that noise in the sound wave S2, particularly middle-low frequency noise, can be effectively suppressed, and a relatively soft sound wave S3 is formed.
The sound wave S3 enters the tuning cavity 103 immediately, and a tuning pad 3, preferably a near-ear end, is arranged at the near-ear end or the far-ear end of the tuning cavity 103; the tuning pad 3 may be PP, nylon, glass fiber, carbon fiber non-woven fabric or mesh material, or even metal material, and has an outer diameter smaller than or equal to the inner diameter of the tuning cavity 103, and the tuning pad 3 is used for filtering part of high, middle and low frequency noise in the sound wave S3, and meanwhile, filters different frequencies in a targeted manner by selecting tuning pads with different materials, densities and thicknesses in the market; the outer side of the tuning pad 3 is covered with the plug cover 4, and the plug cover 4 is provided with a sound outlet 401; after passing through the tuning pad 3, the sound wave S3 passes through the sound outlet 401, and finally forms a sound wave S4 to be transmitted into the auditory canal.
The diameter of the tuning cavity 103 is 3-10 mm, preferably 5.5mm; the thickness of the tuning pad 3 is 0.01 to 1mm, preferably 0.5mm. The diameter of the tuning pad 3 is smaller than or equal to the diameter of the tuning cavity 103.
As shown in fig. 3, in order to further improve tuning quality, a diaphragm 9 may be further disposed in the tuning cavity 103 near the ear end in addition to the tuning pad 3; the vibrating diaphragm 9 is a vibrating slice and can be made of PP, nylon, glass fiber, carbon fiber non-woven fabrics or net-shaped materials, even metal materials; the sound wave S3 is filtered by the tuning pad 3 to form a sound wave S4, the sound wave propagates in the tuning cavity 103, and the sound wave S5 is further refined and filtered by the vibrating diaphragm 9 and is transmitted into the ear.
The large end of the cone-shaped conducting cavity 102 is a near-ear end, and the small end of the conducting cavity 102 is a far-ear end; the large end of the cone stopper rod 2 is a near-ear end, and the small end of the stopper rod 2 is a far-ear end; so positioned, the stopper rod 2 is not easily removed from the conduction cavity 102 by external forces.
Since the noise suppressing cavity 5 is formed by grooving the outer surface of the stopper rod 2, it can be made thinner and longer as needed, and can suppress high-frequency noise effectively, the production process is simpler, and the manufacturing cost is lower.
As shown in fig. 4, in order to prevent external impurities from entering the conducting cavity 102 of the plug body 1, affecting the filtering effect and solving the problem of difficult cleaning of the impurities, a dust cover 6 may be disposed at the connection between the sound collecting cavity 101 and the conducting cavity 102 of the plug body 1, where the dust cover 6 is tightly attached to the plug body 1 or adhered to the plug body 1; the dust cover 6 is provided with at least 1 sound inlet holes 601, and the at least 1 sound inlet holes 601 are distributed on the surface of the dust cover 6 and are used for communicating the sound collecting cavity 101 with the conducting cavity 102; the sound inlet hole 601 is mainly used for facilitating sound to enter the conducting cavity 102 and preventing sundries from entering the conducting cavity 102, so that the sound inlet hole 601 is required to be arranged in a region where the dust cover 6 is connected with the conducting cavity 102; the shape of the sound inlet 601 may be square, circular, or other regular or irregular shapes. Preferably, the sound inlet holes 601 are circular, and 1 in number are provided at the center of the dust cover 6.
As shown in fig. 5, another embodiment of the dust cap 6 is provided with a sound inlet 601, and the sound inlet 601 may be a special slot or other shapes, not limited to the square or round shape.
Preferably, as shown in fig. 6 and 7, the dust cap 6 may also take a mushroom-like form, with a larger cap 602, the cap 602 covering the outside of the conductive cavity 102; a thinner plug handle 603 which can extend into the conduction cavity 102 to realize looseness prevention; the plug handle 603 has certain elasticity and is clamped in the conducting cavity 102, so that the dust cover 6 can be conveniently detached and replaced; the sound inlet 601 extends from the cap 602 into the plug handle 603 to communicate the sound collecting cavity 101 with the conducting cavity 102; as shown in fig. 6 and 7, as a preferred embodiment, the inner cavity of the plug handle 603 is hollow, the sound inlet holes 601 are distributed on the inner side of the cap 602 in a groove shape, and the sound inlet holes 601 penetrate through the joint between the plug handle 603 and the cap 602 and extend into the hollow inner cavity of the plug handle 603.
Preferably, as shown in fig. 8 and 9, as another embodiment, the plug handle 603 is in a non-circular shape, and the sound inlet 601 is distributed on the inner side of the cap 602 in a groove shape; the sound inlet hole 601 penetrates through the joint part of the plug handle 603 and the cap 602 and extends to the non-round part of the plug handle 603; the conducting cavity 102 is communicated with the sound collecting cavity 101 and the outside through the sound inlet 601 and the non-circular plug handle 603.
In order to achieve a better sound collecting effect, the diameter below the inclined plane of the sound collecting cavity 101 is consistent with the diameter of the upper part of the conducting cavity 102, namely, the inclined plane of the sound collecting cavity 101 is directly connected with the conducting cavity 102.
Meanwhile, in order to ensure that the plug handle 603 of the dust cover 6 can be reliably plugged in the conducting cavity 102, the upper part of the conducting cavity 102, namely the part contacted with the plug handle 603, is designed into a surface matched with the plug handle 603, and can be cylindrical with consistent upper and lower diameters; or the plug handle 603 can be conical with small upper diameter and large lower diameter so as to facilitate plugging; the plug handle 603 can also be conical with a large upper diameter and a small lower diameter, and can be elastically expanded to prevent unexpected falling after being plugged in; even other concave-convex complex curved surfaces are mainly used for facilitating the plugging of the plug handle 603 and preventing the plug handle from falling off.
As shown in fig. 10 and 11, the present embodiment further provides a noise reduction earplug, which is formed by combining the silencer 7 and the earplug body 8; the near-ear end of the silencer 7 is inserted into a plug hole of the earplug body 8, and the inner diameter of the plug hole is smaller than the outer diameter of the near-ear end of the silencer 7; the earplugs 8 are provided with one or more layers of fins and are made of flexible plastic, so that the earplugs can effectively fit into the auditory canal, and external sound waves can only be transmitted into the ears after being filtered by the silencer.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (8)
1. The silencer is characterized by comprising a plug body, a plug rod, a tuning pad and a plug cover, wherein a sound collecting cavity is formed at the far ear end of the plug body, a chamfer extending outwards is formed at the edge of the sound collecting cavity, a conducting cavity is formed in the plug body, the conducting cavity is arranged at the rear side of the sound collecting cavity, the plug rod is plugged in the conducting cavity, the plug rod is attached to the conducting cavity, the tuning pad is arranged at the near ear end of the plug body, the plug cover is arranged at the end part of the near ear end of the plug body, the tuning pad is fixed between the plug cover and the tuning pad, a through groove is formed in the outer surface of the plug rod along the axial direction, a noise suppression cavity is formed between the groove on the outer surface of the plug rod and the inner surface of the conducting cavity, and a sound outlet hole is formed in the plug cover;
the dustproof cover is tightly attached to the plug body or stuck to the plug body, at least one sound inlet hole is formed in the dustproof cover, the sound inlet holes are distributed on the surface of the dustproof cover, and the sound collecting cavity is communicated with the conducting cavity;
the dustproof cover is mushroom-shaped, the dustproof cover is provided with a relatively large cover cap and a relatively thin elastic plug handle, the elastic plug handle and the cover cap are fixed, the cover cap covers the outer side of the conducting cavity, the elastic plug handle stretches into and is clamped in the conducting cavity, the sound inlet hole extends into the elastic plug handle from the cover cap, and the sound collecting cavity is communicated with the conducting cavity;
the inner cavity of the elastic plug handle is hollow, the sound inlet holes are distributed on the inner side of the cap in a groove shape, and the sound inlet holes penetrate through the joint part of the elastic plug handle and the cap and extend into the hollow inner cavity of the elastic plug handle;
or the elastic plug handle is in a non-complete round shape, the sound inlet holes are distributed on the inner side of the cap in a groove shape, and the sound inlet holes penetrate through the joint part of the elastic plug handle and the cap and extend into the elastic plug handle;
the conducting cavity is an inverted cone, the stopper rod is a cone, and the cone slope of the stopper rod is equal to the cavity cone slope of the conducting cavity.
2. The muffler of claim 1, wherein the large end of the conductive cavity is a proximal ear end and the small end is a distal ear end, the large end of the stopper rod is a proximal ear end and the small end is a distal ear end, the diameter of the large end of the conductive cavity is 0.5-4 mm, the diameter of the small end of the conductive cavity is 0.5-4 mm, and the length of the conductive cavity is 5-25 mm.
3. The muffler of claim 2, wherein the major end of the conductive cavity has a diameter of 2mm, the minor end of the conductive cavity has a diameter of 1.8mm, and the conductive cavity has a length of 12mm.
4. A muffler as claimed in claim 3, wherein the diameter of the stopper rod matches the inner diameter of the conductive cavity, and the stopper rod has a length of 1mm to 25mm.
5. The muffler of claim 1, wherein the depth of the groove is 0.01 to 0.8mm.
6. The muffler of claim 1, wherein the tuning cavity has a diameter of 3 to 10mm, the tuning pad has a thickness of 0.01 to 1mm, and the tuning pad has a diameter less than or equal to the diameter of the tuning cavity.
7. The muffler of claim 1, wherein a diaphragm is secured to a proximal end of the tuning chamber and the tuning pad is secured to a distal end of the tuning chamber, the diaphragm being a vibrating sheet.
8. A noise reducing earplug comprising the muffler of any one of claims 1-7 and an earplug body having one or more layers of fins, the proximal end of the muffler being inserted into an insertion hole of the earplug body, the insertion hole having an inner diameter smaller than the outer diameter of the proximal end of the muffler.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710937801.4A CN107750021B (en) | 2017-09-30 | 2017-09-30 | Muffler and noise reduction earplug comprising same |
| PCT/CN2017/108298 WO2019061637A1 (en) | 2017-09-30 | 2017-10-30 | Sound attenuation device and noise-cancelling earplug having same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710937801.4A CN107750021B (en) | 2017-09-30 | 2017-09-30 | Muffler and noise reduction earplug comprising same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107750021A CN107750021A (en) | 2018-03-02 |
| CN107750021B true CN107750021B (en) | 2024-04-02 |
Family
ID=61256040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710937801.4A Active CN107750021B (en) | 2017-09-30 | 2017-09-30 | Muffler and noise reduction earplug comprising same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107750021B (en) |
| WO (1) | WO2019061637A1 (en) |
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| FR2925291A3 (en) * | 2007-12-21 | 2009-06-26 | Earsonics | ACOUSTIC DEVICE FOR LINEAR SOUND ATTENUATION |
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| TW201438474A (en) * | 2013-03-18 | 2014-10-01 | Obo Pro 2 Inc | Headset |
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- 2017-09-30 CN CN201710937801.4A patent/CN107750021B/en active Active
- 2017-10-30 WO PCT/CN2017/108298 patent/WO2019061637A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019061637A1 (en) | 2019-04-04 |
| CN107750021A (en) | 2018-03-02 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Silencer and its noise cancelling earplugs Granted publication date: 20240402 Pledgee: Jiangyin branch of Bank of China Ltd. Pledgor: JIANGYIN SIAN PLASTIC PROTECH Co.,Ltd. Registration number: Y2024980035220 |
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