WO2019061639A1

WO2019061639A1 - Sound attenuation device and noise-cancelling earplug having same

Info

Publication number: WO2019061639A1
Application number: PCT/CN2017/108302
Authority: WO
Inventors: 顾少荣
Original assignee: 江阴思安塑胶防护科技有限公司
Priority date: 2017-09-30
Filing date: 2017-10-30
Publication date: 2019-04-04
Also published as: CN107517422B; CN107517422A; DE212017000344U1

Abstract

A sound attenuation device and a noise-cancelling earplug having the same. A sound attenuation device comprises a plug body (1) and a plug rod (2). An outer-side end of the plug body (1) has a sound-gathering cavity (101). An edge of the sound-gathering cavity (101) has a chamfer extending outwardly. A conduction cavity (102) is formed inside the plug body (1). The conduction cavity (102) is arranged behind the sound-gathering cavity (101). The conduction cavity (102) has a cylindrical or an inverted conical shape. The plug rod (2) is inserted into and bonded to the conduction cavity (102). The plug rod (2) has a cylindrical or a conical shape. A hole (201) is formed on and extends through an outer surface of the plug rod (2) in an axial direction. The hole (201) on the outer surface of the plug rod (2) and an inner surface of the conduction cavity (102) together form a noise-suppressing cavity (3). The earplug can cut out hazardous noise while maintaining the intensity of the required portion of sound to be within a reasonable range audible to a user.

Description

Silencer and noise reduction earplug including the same

Technical field

The present invention relates to the field of silencers for filtering noise, and more particularly to a silencer and a noise reduction earplug including the same.

Background technique

At present, various requirements for hearing protection in life and work are becoming more and more common. Conventional sponges and plastic earplugs can reduce the decibel value of various sounds. At present, the market has developed a small hole to reduce the penetration of sound waves, thereby reducing the intensity of the mid-high frequency sound, but due to the diffraction characteristics of the sound wave, the reduction of some frequencies, especially the low-mid frequency noise, is not effectively controlled.

Summary of the invention

The present invention is directed to the problems and deficiencies of the prior art, and provides a muffler and a noise reduction earplug including the same, which can prevent the harmful sound of the part while maintaining the required partial sound intensity in a reasonable range of the human ear. Inside.

The present invention solves the above technical problems by the following technical solutions:

The present invention provides a muffler, which is characterized in that it comprises a plug body and a plug rod, the distal end of the plug body is provided with a sound chamber, and the edge of the sound chamber has an outwardly extending chamfer a conductive cavity is defined in the plug body, the conductive cavity is disposed on a rear side of the sound chamber, the conductive cavity is a cylinder or an inverted cone, and the conductive cavity is internally provided with a stopper rod. The plug rod is in contact with the conductive cavity, the plug rod is a cylinder or a cone, and the outer surface of the plug rod has a through groove extending in the axial direction, and a groove on the outer surface of the plug rod A noise suppression cavity is formed with the inner surface of the conduction cavity.

Preferably, a dust cover is disposed at a junction of the sound chamber and the conductive cavity, and the dust cover is tight Attached to the plug body or adhered to the plug body, the dust cover is provided with at least one sound hole, and the sound hole is distributed on the surface of the dust cover, and The sound chamber is in communication with the conductive chamber.

Preferably, the dust cover has a mushroom shape, and the dust cover has a relatively large cap and a relatively thin elastic plug, and the elastic plug is fixed to the cap, and the cap is An outer side of the conductive cavity, the elastic stalk extends into and is clamped in the conductive cavity, the sound hole extends from the cap into the elastic stalk, and the sound chamber is The conductive cavities are in communication.

Preferably, the inner cavity of the elastic plug is hollow, the sound hole is distributed in a groove shape on the inner side of the cap, and the sound hole passes through the elastic plug and the cap. The bonding portion extends into the hollow interior of the elastic plug.

Preferably, the elastic shank is non-circular, and the sound hole is distributed in a groove shape on the inner side of the cap, and the sound hole passes through the elastic plug and the cap. The portion extends into the elastic plug.

Preferably, the conducting cavity is an inverted cone, the plug is a cone, and the cone slope of the plug is equal to the chamber cone of the conducting cavity; or the conducting cavity is a cylinder, the stopper rod is a cone; or the conduction chamber is a cone, the stopper rod is a cylinder; and the conduction chamber and the stopper rod are both cylinders.

Preferably, the large end of the conduction cavity is a near-ear end, and the small end is a distal end, the large end of the stopper is a proximal end, and the small end is a distal end, and the large end diameter of the conduction cavity The diameter of the small end of the conduction chamber is 0.5 to 4 mm, and the length of the conduction chamber is 5 to 25 mm.

Preferably, the conduction chamber has a large end diameter of 2 mm, the conduction chamber has a small end diameter of 1.8 mm, and the conduction chamber has a length of 12 mm.

Preferably, the diameter of the stopper rod matches the inner diameter of the conduction chamber, and the length of the stopper rod is 1 mm to 25 mm.

Preferably, the groove has a depth of 0.01 to 0.5 mm.

Preferably, the outer surface of the plug body has a three-stage type, which is an irregular polyhedral end portion, an intermediate connecting body and a plug-in end, the plug-in end is generally tapered, and the plug-in end has a large cone. The end diameter is larger than the diameter of the intermediate connector.

The present invention also provides a noise reduction earplug, characterized in that it comprises the above-mentioned muffler and earplug body, the earplug body has one or more layers of fins, and the proximal end of the muffler is inserted in the The earplug body is inserted into the hole, and the inner diameter of the stuffing hole is smaller than the outer diameter of the proximal end of the muffler.

Based on the common knowledge in the art, the above various preferred conditions can be arbitrarily combined to obtain preferred embodiments of the present invention.

The positive effects of the present invention are:

The invention can keep harmful sounds while keeping the required partial sound intensity within a reasonable range of human ear acquisition.

DRAWINGS

1 is a schematic structural view of a muffler according to a preferred embodiment of the present invention.

2 is an exploded perspective view of a muffler of a preferred embodiment of the present invention.

Figure 3 is a cross-sectional view of a muffler in accordance with a preferred embodiment of the present invention.

4 is a schematic structural view of a dust cover according to an embodiment of the present invention.

FIG. 5 is a schematic structural view of a dust cover according to another embodiment of the present invention.

6 and 7 are schematic structural views of a dust cover according to still another embodiment of the present invention.

8 and 9 are schematic structural views of a dust cover according to another embodiment of the present invention.

10 and 11 are schematic views showing the structure of a plug body according to another embodiment of the present invention.

12 and 13 are schematic structural views of a noise reduction earplug according to a preferred embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 1-3, the present embodiment provides a muffler composed of a plug body 1 and a stopper rod 2. The distal end of the plug body 1 is provided with a sound chamber 101, and the edge of the sound chamber 101 has an outwardly extending chamfer, so that the external sound wave S1 enters the silencer; the rear side of the sound chamber 101 is provided The conductive cavity 102 is a cylinder or an inverted cone; the conductive cavity 102 is provided with a stopper rod 2, and the stopper rod 2 is a cylinder or a cone. For better fit, the conductive cavity 102 is preferably an inverted cone, and the stopper 2 is preferably a cone.

The shape of the conductive cavity 102 and the stopper rod 2 is mainly selected based on the plug rod 2 being inserted into the conductive cavity 102, and can be closely adhered; when the condition of close fitting is satisfied, the conductive cavity 102 can be a cylinder. The stopper rod 2 is a cone; or the conduction chamber 102 may be a cone, and the stopper rod 2 is a cylinder; even, the conduction chamber 102 and the stopper rod 2 are both cylindrical; ensuring that the stopper rod 2 is inserted After the conduction of the cavity 102, the wall surfaces of the two walls can be closely adhered to each other in the axial direction due to the pressing action.

The diameter of the large end of the conducting cavity 102 is 0.5-4 mm, preferably 2 mm; the diameter of the small end of the conducting cavity 102 is 0.5-4 mm, preferably 1.8 mm; the length of the conducting cavity 102 is 5-25 mm, preferably 12 mm.

The stopper rod 2 is a cylinder or a cone, preferably a cone, the diameter of the stopper rod 2 is the same as the inner diameter of the 102 conduction chamber; the length of the stopper rod 2 is 1 mm to 25 mm, preferably 3 mm to 8 mm; The outer surface of the second surface has a through groove 201 (see FIG. 2) in the axial direction; the groove 201 has a depth of 0.01 to 0.5 mm, and is preferably 0.1 mm to 0.3 mm, depending on the actual use.

The cone slope of the stopper rod 2 is equal to the chamber cone slope of the conduction chamber 102; the small end of the stopper rod 2 is inserted into the conduction chamber 102 through the large end of the conduction chamber 102; The outer surface of the stopper rod 2 is in close contact with the inner surface of the conduction cavity 102; the groove 201 on the outer surface of the stopper rod 2 and the inner surface of the conduction cavity 102 form a noise suppression cavity 3; The sound wave S1 enters the conduction cavity 102 through the sound chamber 101 to form an acoustic wave S2; the sound wave S2 further propagates into the ear canal through the noise suppression cavity 3, and the cavity 3 is relatively narrow due to the noise suppression, so that the sound wave can be effectively The noise in S2, especially the mid-low frequency noise, is suppressed, thereby forming a relatively soft sound wave S3, which is transmitted to the ear.

The large end of the cone conduction cavity 102 is a proximal end, the small end of the conduction cavity 102 is a distal end; the large end of the cone stopper 2 is a proximal end, and the stopper 2 is small The end is the far ear end; after this setting, the stopper rod 2 is not easily taken out from the conduction chamber 102 by an external force.

Since the noise suppression chamber 3 is formed by the slot 2 being slotted on the outer surface thereof, it can be made thinner and longer according to needs, and can effectively suppress various types of noise, and the production process is relatively simple. And the manufacturing cost is also low.

As shown in FIG. 4, in order to prevent foreign matter from entering the conductive cavity 102 of the plug body 1, the filtering effect is affected, and the problem of debris cleaning is difficult, and the sound chamber 101 and the conductive cavity 102 of the plug body 1 can be A dust cover 6 is disposed at the connection, and the dust cover 6 is closely attached to the plug body 1 or adhered to the plug body 1; the dust cover 6 is provided with a sound hole 601, the sound hole At least one of 601 is distributed on the surface of the dust cover 6, and connects the sound chamber 101 to the conduction cavity 102; the sound hole 601 mainly serves to facilitate sound entering the conduction cavity 102, and prevents debris Entering the conductive cavity 102, the sound hole 601 is required to be disposed in a region where the dustproof cover 6 is connected to the conductive cavity 102; the shape of the sound hole 601 may be square, circular, or other rules. ,irregular shape. Preferably, the sound hole 601 is circular and has a number of one, and is disposed at a center position of the dust cover 6.

As shown in FIG. 5 , it is another embodiment of the dustproof cover 6 , and the sound hole 601 is disposed thereon. The sound hole 601 may be a profiled groove or other shape, and is not limited to the above-mentioned square or circular shape.

Preferably, as shown in FIGS. 6 and 7, the dust cover 6 may also have a mushroom-like form with a larger cap 602, the cap 602 covering the outside of the conductive cavity 102; a thin plug 603, The plug handle can extend into the conductive cavity 102 to achieve anti-looseness; the plug handle 603 has a certain elasticity, is clamped in the conductive cavity 102, and is convenient for disassembling and replacing the dust cover 6; the sound hole 601 extends from the cap 602 to the plug handle 603, the sound chamber 101 is connected to the conductive cavity 102; as shown in FIG. 6 and 7, as a preferred embodiment, the inner cavity of the plug 603 is hollow, and the sound hole 601 is a groove. The shape is distributed on the inner side of the cap 602, and the sound hole 601 passes through the joint portion of the plug 603 and the cap 602, and extends into the hollow inner cavity of the plug 603.

Preferably, as shown in FIG. 8 and FIG. 9 , as another embodiment, the plug 603 is non-circular, and the sound hole 601 is groove-shaped on the inner side of the cap 602; The hole 601 extends through the joint portion of the plug 603 and the cap 602, and extends to a non-rounded portion of the plug handle 603; the conductive cavity 102 is separated by the sound hole 601 and the non-circular plug 603 The sound chamber 101 is connected to the outside world.

In order to achieve a better sound-sounding effect, the diameter below the slope of the sound chamber 101 coincides with the diameter of the upper portion of the conductive chamber 102, that is, the slope of the sound chamber 101 is directly connected to the conductive chamber 102.

Meanwhile, in order to ensure that the stopper 603 of the dustproof cover 6 can be reliably inserted into the conduction cavity 102, an upper portion of the conduction cavity 102, that is, a portion in contact with the stopper 603, is designed to be in contact with the stopper The matching surface of the 603 may be a cylindrical shape having a uniform upper and lower diameter; or a taper having a small upper diameter and a large lower diameter to facilitate the insertion of the stopper 603; or the upper diameter is large and the lower diameter is small. Conical, when the stopper 603 is inserted, the elasticity is increased to prevent accidental falling off; even the complicated curved surface of other concavities and convexities is mainly to facilitate the insertion of the stopper 603 and prevent it from falling off.

As shown in FIGS. 10 and 11, as another embodiment of the plug body 1, the plug body 1 also has a sound chamber 101 and a conductive cavity 102; the outer surface of the plug body 1 is divided into three sections, which are respectively irregular polyhedron ends 103, and the polyhedron is designed to conveniently hold the muffler body; the thinner connecting body 104 is And the insertion end 105; the insertion end 105 is generally tapered to facilitate insertion into the matching earplug body, and the diameter of the large end of the cone end of the insertion end 105 is larger than the diameter of the connecting body 104, so that the muffler is passed through After the insertion end 105 is inserted into the body of the matching earplug, since the diameter of the connecting body 104 is smaller than the diameter of the large end of the cone of the insertion end 105, it is convenient for the body cavity of the earplug to catch the silencer here, which contributes to the reliability of the installation of the silencer.

As shown in FIG. 12 and FIG. 13 , the present embodiment further provides a noise reduction earplug having the above-mentioned silencer 4 and the earplug body 5; the proximal end of the silencer 4 is inserted into the earplug body 5 Inserted into the hole, the inner diameter of the insertion hole is smaller than the outer diameter of the proximal end of the muffler 4; the earplug body 5 has one or more layers of fins, made of flexible plastic, which can effectively fit the ear canal, so that The external sound waves can only be transmitted to the ear after being filtered by the silencer.

While the invention has been described with respect to the preferred embodiments of the present invention, it is understood that the scope of the invention is defined by the appended claims. A person skilled in the art can make various changes or modifications to the embodiments without departing from the spirit and scope of the invention, and such changes and modifications fall within the scope of the invention.

Claims

A muffler, comprising: a plug body and a plug rod, wherein the distal end of the plug body is provided with a sound chamber, and the edge of the sound chamber has an outwardly extending chamfer, a conductive cavity is defined in the plug body, the conductive cavity is disposed on a rear side of the sound chamber, the conductive cavity is a cylinder or an inverted cone, and the conductive cavity is internally provided with a stopper rod, and the stopper rod Cooperating with the conductive cavity, the stopper rod is a cylinder or a cone, and an outer surface of the stopper rod has a through groove extending in the axial direction, a groove on the outer surface of the stopper rod and the groove The inner surface of the conductive cavity forms a noise suppression cavity.
The muffler according to claim 1, wherein a dust cover is disposed at a junction of the sound chamber and the conductive cavity, and the dust cover is closely attached to the plug body or adhered thereto. The dust cover is provided with at least one sound hole, and the sound hole is distributed on the surface of the dust cover, and the sound chamber is connected to the conductive cavity.
A muffler according to claim 2, wherein said dust cover has a mushroom shape, said dust cover has a relatively large cap and a relatively thin elastic stopper, said elastic stopper and said The cap is fixed, the cap is on the outer side of the conducting cavity, the elastic plug extends into and is clamped in the conducting cavity, and the sound hole extends from the cap to the elastic plug And communicating the sound chamber with the conductive cavity.
The muffler according to claim 3, wherein the inner cavity of the elastic plug is hollow, and the sound hole is groove-shaped on the inner side of the cap, and the sound hole passes through The elastic plug has a joint with the cap and extends into the hollow inner cavity of the elastic plug.
A muffler according to claim 3, wherein said elastic plug is non-circular, said sound hole is groove-shaped on the inner side of said cap, and said sound hole passes through said The joint of the elastic plug and the cap extends into the elastic plug.
A muffler according to claim 1, wherein said conducting chamber is an inverted cone, said plug rod is a cone, and said plug rod has a cone slope equal to a chamber cone of said conducting chamber a slope; or, the conductive cavity is a cylinder, the plug is a cone; or the conductive cavity is a cone The plug is a cylinder; the conducting chamber and the plug are both cylindrical.
The muffler according to claim 1, wherein the large end of the conductive cavity is a proximal end and the small end is a distal end, and the large end of the stopper is a proximal end and a small end is a distal ear. 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.
The muffler according to claim 7, wherein said conductive cavity has a large end diameter of 2 mm, said conductive cavity has a small end diameter of 1.8 mm, and said conductive cavity has a length of 12 mm.
A muffler according to claim 8, wherein the diameter of the stopper rod matches the inner diameter of the conduction chamber, and the length of the stopper rod is from 1 mm to 25 mm.
The muffler according to claim 1, wherein said groove has a depth of 0.01 to 0.5 mm.
The muffler according to claim 1, wherein the outer surface of the plug body has a three-stage type, which is an irregular polyhedron end, an intermediate connecting body and a plugging end, and the plugging end is a whole cone. The diameter of the large end of the cone at the insertion end is larger than the diameter of the intermediate connector.
A noise reduction earplug, comprising: the muffler and the earplug body according to any one of claims 1 to 11, the earplug body having one or more layers of fins, the muffler being near The ear end is inserted into the insertion hole of the earplug body, and the inner diameter of the insertion hole is smaller than the outer diameter of the proximal end of the muffler.