CN2168316Y - Noice-damping talk-listen type earcover - Google Patents
Noice-damping talk-listen type earcover Download PDFInfo
- Publication number
- CN2168316Y CN2168316Y CN 93208809 CN93208809U CN2168316Y CN 2168316 Y CN2168316 Y CN 2168316Y CN 93208809 CN93208809 CN 93208809 CN 93208809 U CN93208809 U CN 93208809U CN 2168316 Y CN2168316 Y CN 2168316Y
- Authority
- CN
- China
- Prior art keywords
- earmuff
- noise reduction
- sound
- noise
- conversation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model relates to a noise-damping personal labor protection device. Ear covers are composed of casings, reflecting layers in the interlayers of the casings, selectivity noise absorption layers, and an elastic holder for connecting the two ear covers. Reverberation preventing layers are stuck on the inner surfaces of the ear covers.
Description
The utility model is a kind of noise reduction sound individual labour protection utensil.
Existing noise reduction sound earmuff (plug), its shortcoming are not hear mutual dialogue sound after wearing, and ear inserting type is more worn discomfort, easily cause the earhole scratch to infect.Active mode denoise sound ear cover structure complexity can not reach the purpose of mutual dialogue.
The design's purpose is to improve existing noise reduction sound earmuff, design a kind ofly can reduce noise significantly, can not hear mutual dialogue again, the individual post simple in structure noise reduction sound utensil of working.It is by the design of the ultimate principle of acoustics.
A part is a high frequency noise in noise spectrum, for example more than 2000 hertz, common people's dialogue audio spectrum is in 20-400 hertz scope, if utilize the selectivity absorption function of all kinds of acoustic field mediums to the different frequency noise, and reasonably mate the raising signal to noise ratio, can reach the design's purpose.
In order to realize above-mentioned purpose of design, the earmuff of this design is by shell ［ 1 ］, and reflection horizon ［ 2 ］, selectivity absorbent treatment ［ 3 ］, anti-reverberation layer ［ 4 ］, resilient clamp device ［ 5 ］ is formed.Its making characteristics are reflection horizon ［ 2 ］, selectivity absorbent treatment ［ 3 ］, are contained in the interlayer of shell ［ 1 ］, and anti-reverberation layer ［ 4 ］ is affixed on shell ［ 1 ］ surface and earhole opposite position.A pair of earmuff is connected by resilient clamp device ［ 5 ］.
In order to improve the noise reduction sound effective value, except the earmuff shell has the effect of certain reflection-absorption noise, also be provided with reflection horizon ［ 2 ］, the effect of mainly undertaking reflecting background, reflection horizon ［ 2 ］ select the material of acoustic impedance.The acoustic impedance of different medium is different in sound field.The great disparity of two media acoustic impedance is big more, and the reflection coefficient of sound on this surface of discontinuity is also big more.For example the acoustic impedance of iron is 100,000 times of air, according to calculating, under the situation of unlimited free medium, sound reflection coefficient on air and the iron interface is 100%, but for air and limited iron plate, some transmitted acoustic pulse except reflective sound wave, and its transmission also has frequency selectivity.The iron plate of 1 millimeters thick for example is 17 decibels for the transmission loss of 125 hertz of sound waves, is 34 decibels for the transmission loss of 1000 hertz of sound waves.
Selectively absorbing layers ［ 3 ］ is a kind of poriness or fibrous material, and the selectivity of mainly undertaking noise medium-high frequency composition absorbs.In order to adapt to the difference of different industries noise spectrum, the material of selectivity absorbent treatment ［ 3 ］ can be selected according to the requirement of varying environment, makes the earmuff of different model, adapts to all kinds of personnel to greatest extent and wears use.
In order to make this noise reduction sound earmuff prevent reverberation in use, need paste the anti-reverberation layer ［ 4 ］ of one deck with respect to the earhole place at the earmuff inside surface, to reach the purpose that prevents reverberation.
The design's shell ［ 1 ］ can be done circular or ellipse, and selectivity absorbent treatment ［ 3 ］ can exchange with being provided with in proper order of reflection horizon ［ 2 ］.
The design's example is:
Shell ［ 1 ］ is that 84 millimeters round plastic is made by external diameter, and make with the iron material of 0.5-2 millimeter reflection horizon ［ 2 ］, and what selectivity absorbent treatment ［ 3 ］ was selected for use is the poriness rigid foam.Anti-reverberation layer ［ 4 ］ is a kind of soft blister compound substance, and this example can use for the textile industry personnel.Can make noise reduce to 76 decibels in Weaving Shop by 103 decibels.And can not hear mutual dialogue sound.
This noise reduction sound conversation earmuff is that a kind of passive-type earmuff has simple in structure; excellent noise reduction effect; be applicable to industries uses such as the serious weaving of noise hazard, ferrous metal smelting, mineral selecting and purchasing, machinery, to protect the staff who is in for a long time under the slight elevated noise environment.
The Figure of description explanation:
Demonstrated the cut-open view of this noise reduction sound conversation earmuff among the figure.［ 1 ］ be plastic casing, ［ 2 ］ are the reflection horizon, and ［ 3 ］ are the selectivity absorbent treatment, and ［ 4 ］ are anti-reverberation layer, and ［ 5 ］ are the resilient clamp device.
Claims (4)
1, a kind of noise reduction sound conversation earmuff is characterized in that, by shell [1], reflection horizon [2], and selectivity absorbent treatment [3], anti-reverberation layer [4], resilient clamp device [5] is formed.
2, the said noise reduction sound of claim 1 conversation earmuff is characterized in that selectivity absorbent treatment ［ 3 ］ is different with the acoustical absorption coefficient of dialogue sound to high frequency noise.
3, the said noise reduction sound of claim 1 conversation earmuff, the acoustic impedance of material that it is characterized in that reflection horizon ［ 2 ］ is far above the acoustic impedance of air.
4, the said noise reduction sound of claim 1 conversation earmuff is characterized in that anti-reverberation layer ［ 4 ］ is attached to the surface and the earhole opposite position of shell ［ 1 ］.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93208809 CN2168316Y (en) | 1993-04-08 | 1993-04-08 | Noice-damping talk-listen type earcover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93208809 CN2168316Y (en) | 1993-04-08 | 1993-04-08 | Noice-damping talk-listen type earcover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2168316Y true CN2168316Y (en) | 1994-06-08 |
Family
ID=33791172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93208809 Expired - Fee Related CN2168316Y (en) | 1993-04-08 | 1993-04-08 | Noice-damping talk-listen type earcover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2168316Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104602143A (en) * | 2015-02-05 | 2015-05-06 | 深圳市创世达实业有限公司 | Howlround-preventing device and microphone using same |
| CN106963551A (en) * | 2017-04-26 | 2017-07-21 | 苏州大学 | Sound-absorbing and sound-insulating earplug and manufacturing method thereof |
| CN109246510A (en) * | 2018-09-28 | 2019-01-18 | 出门问问信息科技有限公司 | Earphone |
| CN112887859A (en) * | 2019-11-30 | 2021-06-01 | 华为技术有限公司 | Ear pad, ear muff part and earphone |
-
1993
- 1993-04-08 CN CN 93208809 patent/CN2168316Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104602143A (en) * | 2015-02-05 | 2015-05-06 | 深圳市创世达实业有限公司 | Howlround-preventing device and microphone using same |
| CN106963551A (en) * | 2017-04-26 | 2017-07-21 | 苏州大学 | Sound-absorbing and sound-insulating earplug and manufacturing method thereof |
| CN109246510A (en) * | 2018-09-28 | 2019-01-18 | 出门问问信息科技有限公司 | Earphone |
| CN112887859A (en) * | 2019-11-30 | 2021-06-01 | 华为技术有限公司 | Ear pad, ear muff part and earphone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |