CN210805213U - Sound insulation device with adjustable acoustic characteristics - Google Patents
Sound insulation device with adjustable acoustic characteristics Download PDFInfo
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- CN210805213U CN210805213U CN201921371018.7U CN201921371018U CN210805213U CN 210805213 U CN210805213 U CN 210805213U CN 201921371018 U CN201921371018 U CN 201921371018U CN 210805213 U CN210805213 U CN 210805213U
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Abstract
The utility model relates to a sound insulation technical field provides a sound arrester of adjustable acoustics characteristic. The device comprises a shell with a hollow interior, wherein a first end of the shell is open, a vibrating diaphragm covers the open, and the vibrating diaphragm is provided with a first magnetic part; the second end of the shell is provided with a second magnetic part which is mutually attracted or repelled with the first magnetic part, and the distance between the second magnetic part and the first magnetic part is adjustable so as to realize the broadband adjustment of the sound insulation characteristic of the sound insulation device. The utility model discloses can change the size of appeal or repulsion force that first magnetic part received through adjusting the distance between second magnetic part and the first magnetic part during the use, and then just can change the local resonance mechanical properties of vibrating diaphragm, realize the broadband of the device sound insulation characteristic and adjust. It can be seen that, the utility model discloses a film sound arrester of low frequency broadband sound insulation, not only green economy is easily implemented, light compactness, simple operation, and the characteristic is nimble adjustable moreover, can adjust the sound insulation characteristic at any time according to the environmental requirement, can extensively adapt to the environmental requirement.
Description
Technical Field
The utility model relates to a sound insulation technical field especially relates to a sound arrester of adjustable acoustics characteristic.
Background
In the field of noise control, a film material is one of the commonly used sound absorbing materials. The film acoustic device becomes an acoustic metamaterial through special design, can realize the attenuation of sub-wavelength sound waves, has the characteristics of light weight and compact space, and gradually becomes a hot spot of the research of acoustic experts at home and abroad.
However, since the frequency of the conventional thin film acoustic device is fixed after the manufacturing process is completed, the position of the high dissipation band of the acoustic wave cannot be adjusted again. Therefore, the existing thin film acoustic device cannot adapt to the tonal component of the frequency spectrum of the noise source in the operation process of the noise source. For example, when the noise source is a propeller engine, if the rotation speed of the propeller engine changes, the position of the high dissipation band of the sound wave cannot be adjusted by the conventional thin film acoustic device according to the change of the frequency spectrum of the noise source. In addition, the film prestress changes due to temperature change, aging and the like, so that the original sound wave loss frequency band of the existing film acoustic device shifts, and the prevention and control requirements of the noise of the set frequency band can not be met.
SUMMERY OF THE UTILITY MODEL
The present invention aims at least solving one of the technical problems existing in the prior art or the related art.
The utility model aims at providing a compact, the adjustable sound arrester of sound insulation characteristic of light.
In order to achieve the above object, the present invention provides a sound insulation device with adjustable acoustic characteristics, which comprises a hollow casing, wherein a first end of the casing is open, the open is covered with a vibrating diaphragm, and the vibrating diaphragm is provided with a first magnetic member; and a second magnetic part which is mutually attracted or repelled with the first magnetic part is arranged at the second end of the shell, and the distance between the second magnetic part and the first magnetic part is adjustable so as to realize the broadband adjustment of the sound insulation characteristic of the sound insulation device.
Wherein, the first magnetic part is a light iron sheet or a magnetic sheet.
The second magnetic part is inserted into the second end of the shell, the second end of the shell is provided with an opening, and the mounting sleeve is suspended in the opening through a plurality of spokes.
The inner wall of the mounting sleeve is provided with an internal thread, and the outer wall of the second magnetic part is provided with an external thread matched with the internal thread.
And scale marks are arranged on the second magnetic piece along the length direction of the second magnetic piece.
Wherein, it is a plurality of the spoke is followed the circumference of installing the cover sets gradually.
The number of the first magnetic pieces is single, and the second end of the shell is provided with the second magnetic pieces corresponding to the first magnetic pieces.
The first magnetic pieces are multiple in number, and the second magnetic pieces in one-to-one correspondence with the first magnetic pieces are arranged at the second end of the shell.
Compared with the prior art, the utility model has the advantages of it is following:
the utility model provides a sound insulation device with adjustable acoustic characteristics, which comprises a vibrating diaphragm and a hollow shell, wherein the first end of the shell is open, the vibrating diaphragm covers the opening, and the vibrating diaphragm is provided with a first magnetic part; the second end of the shell is provided with a second magnetic part which is mutually attracted or repelled with the first magnetic part, and the distance between the second magnetic part and the first magnetic part is adjustable. When the low-frequency sound insulation device is used, the first magnetic part is coupled with the vibrating diaphragm under the action of sound waves, and low-frequency sound insulation is achieved by utilizing a local resonance mechanism. The size of attractive force or repulsive force borne by the first magnetic part can be changed by adjusting the distance between the second magnetic part and the first magnetic part, so that the local resonance mechanical property of the vibrating diaphragm can be changed, and the broadband adjustment of the sound insulation property of the device is realized. It is thus clear that the utility model discloses not only green economy is easily implemented, light compactness, simple operation, and the characteristic is nimble adjustable moreover can adjust the sound insulation characteristic at any time, can extensively adapt to the environmental requirement according to the environmental requirement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sound-insulating device with adjustable acoustic characteristics according to embodiment 1 of the present invention;
fig. 2 is an experimental graph showing a relationship between a distance between the first magnetic member and the second magnetic member and a sound insulation frequency and a transmission loss of a sound insulation device having an adjustable acoustic characteristic according to embodiment 1 of the present invention.
Reference numerals:
1. a housing; 2. vibrating diaphragm; 3. a first magnetic member; 4. a second magnetic member; 5. spokes;
6. and (7) installing a sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the utility model.
In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
It is to be understood that, unless otherwise expressly stated or limited, the term "coupled" is used in a generic sense as defined herein, e.g., fixedly attached or removably attached or integrally attached; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the utility model can be understood in specific cases to those of ordinary skill in the art.
Example 1
As shown in fig. 1, the present embodiment provides a sound insulation device with adjustable acoustic characteristics, the device includes a hollow housing 1, a first end of the housing 1 is open, the open is covered with a diaphragm 2, and the diaphragm 2 is provided with a first magnetic member 3; the second end of the shell 1 is provided with a second magnetic part 4 which is mutually attracted or repelled with the first magnetic part 3, and the distance between the second magnetic part 4 and the first magnetic part 3 is adjustable so as to realize the broadband adjustment of the sound insulation characteristic of the sound insulation device. It should be noted that the first magnetic member 3 and the second magnetic member 4 described herein are members that can react to a magnetic field, that is, members that can be attracted or repelled by a magnetic field. For example, the first magnetic member 3 is a light iron sheet, and the second magnetic member 4 is a magnetic sheet; alternatively, both the first magnetic member 3 and the second magnetic member 4 are magnetic sheets.
The following describes a method for using the sound insulation device with adjustable acoustic characteristics according to this embodiment, taking the first magnetic member 3 and the second magnetic member 4 as an example, where:
the first magnetic part 3 is coupled with the vibrating diaphragm 2 under the action of sound waves, and low-frequency sound insulation is realized by utilizing a local resonance mechanism. When the sound-insulating frequency of the device needs to be increased, the second magnetic part 4 is moved towards the first magnetic part 3. As the second magnetic member 4 approaches the first magnetic member 3, that is, as the distance between the second magnetic member 4 and the first magnetic member 3 decreases, the attractive force applied to the first magnetic member 3 increases. In the process, the vibrating diaphragm 2 is driven by the first magnetic part 3 to recess towards the second magnetic part 4, the tension of the vibrating diaphragm 2 is increased accordingly, and the sound insulation frequency of the device is increased. When the sound insulation frequency of the device needs to be reduced, the second magnetic part 4 is moved in a direction away from the first magnetic part 3. As the second magnetic member 4 is continuously away from the first magnetic member 3, that is, as the distance between the second magnetic member 4 and the first magnetic member 3 is continuously increased, the attractive force applied to the first magnetic member 3 is reduced. In the process, the degree of the depression of the diaphragm 2 towards the second magnetic part 4 is gradually reduced, the tension of the diaphragm 2 is reduced, and the sound insulation frequency of the device is reduced.
It should be noted that the method of using the apparatus when the first magnetic member 3 and the second magnetic member 4 repel each other is the same as the above process, and is not described herein again. The difference lies in that: when the second magnetic member 4 moves toward the first magnetic member 3, the repulsive force applied to the first magnetic member 3 increases, the diaphragm 2 is driven by the first magnetic member 3 to bulge in a direction away from the second magnetic member 4, and the tension of the diaphragm 2 increases accordingly. On the contrary, when the second magnetic member 4 is moved in the direction away from the first magnetic member 3, the repulsive force applied to the first magnetic member 3 is reduced, the swelling degree of the diaphragm 2 away from the second magnetic member 4 is gradually reduced, and the tension of the diaphragm 2 is reduced accordingly.
In addition, the size and the mass of the first magnetic part 3 are designed according to the sound wave control requirement, so that the first magnetic part 3 and the vibrating diaphragm 2 can be coupled under the action of sound waves, and the low-frequency sound insulation is realized by utilizing a local resonance mechanism. As shown in fig. 2, the worker can change the sound insulation amount of the sound insulation device at the corresponding sound insulation frequency by adjusting the distance between the second magnetic member 4 and the first magnetic member 3. The whole adjusting process is gradually reduced from far to near, namely the distance l between the second magnetic part 4 and the first magnetic part 3 is gradually reduced, for example, when l is 2.0mm, the sound insulation device reaches the maximum sound insulation amount of 17dB at 500 HZ. When l is 1.0mm, the sound insulation device reaches a sound insulation peak value at 800HZ, and the maximum sound insulation amount is 23 dB.
Therefore, when the device is used, the first magnetic part 3 and the vibrating diaphragm 2 are coupled to generate local resonance under the action of sound waves, the size of attractive force or repulsive force borne by the first magnetic part 3 can be changed by adjusting the distance between the second magnetic part 4 and the first magnetic part 3, the mechanical property of the local resonance of the vibrating diaphragm 2 can be further changed, and the broadband adjustment of the sound insulation property of the device is realized. Therefore, the device is compact in structure, convenient to operate, green and economical, wide in application range and capable of adjusting sound insulation characteristics at any time according to environmental requirements.
Preferably, as shown in fig. 1, the device further comprises a mounting sleeve 6 for inserting the second magnetic member 4, the second end of the housing 1 has an opening, the mounting sleeve 6 is suspended in the opening by a plurality of spokes 5, that is, one end of the spoke 5 is connected with the edge of the opening, and the other end extends into the opening and is connected with the mounting sleeve 6. More preferably, a plurality of spokes 5 are arranged in sequence along the circumference of the mounting sleeve 6. For example, the number of the spokes 5 is three, and the included angle between two adjacent spokes 5 is 120 °. Wherein the housing 1, the mounting sleeve 6 and the spokes 5 may be integrally formed.
It should be noted that, in order to adjust the distance between the second magnetic member 4 and the first magnetic member 3, various ways can be adopted, such as: the inner wall of the mounting sleeve 6 is provided with internal threads, and the outer wall of the second magnetic part 4 is provided with external threads matched with the internal threads. Therefore, when the distance between the second magnetic member 4 and the first magnetic member 3 needs to be reduced, the second magnetic member 4 may be directly screwed out from the mounting sleeve 6 toward one end of the first magnetic member 3. On the contrary, when the distance between the second magnetic member 4 and the first magnetic member 3 needs to be increased, the second magnetic member 4 is directly screwed into the mounting sleeve 6.
Of course, in order to omit the step of forming the thread on the second magnetic member 4 and simplify the process flow, when the inner wall of the mounting sleeve 6 is provided with the internal thread, the second magnetic member 4 may be driven by a bolt, specifically, the second magnetic member 4 is slidably inserted into one end of the mounting sleeve 6 facing the first magnetic member 3, and one end of the mounting sleeve 6 facing away from the first magnetic member 3 is screwed with the bolt. Therefore, when the distance between the second magnetic member 4 and the first magnetic member 3 needs to be reduced, the bolt is gradually screwed into the mounting sleeve 6. At this time, as the length of the bolt extending into the mounting sleeve 6 increases, the second magnetic member 4 is gradually pushed out of the mounting sleeve 6 by the bolt, that is, at this time, the second magnetic member 4 approaches the first magnetic member 3. On the contrary, when the distance between the second magnetic member 4 and the first magnetic member 3 needs to be increased, the bolt is gradually screwed out of the mounting sleeve 6. At this time, as the length of the bolt extending into the mounting sleeve 6 is continuously reduced, the second magnetic member 4 is gradually inserted into the mounting sleeve 6, that is, at this time, the second magnetic member 4 is continuously away from the first magnetic member 3.
Preferably, in order to accurately control the moving distance of the second magnetic member 4, the second magnetic member 4 is provided with scale marks along the length direction thereof.
Preferably, the material of the housing 1 is aluminum, and the material of the diaphragm 2 is PET, i.e., polyethylene terephthalate. The cross-sectional shape of the housing 1 may be, but is not limited to, circular, elliptical, or polygonal; the cross-sectional shape of the first magnetic element 3 and/or the second magnetic element 4 is circular, elliptical, polygonal or irregular.
Preferably, the number of the first magnetic members 3 is single, and the second end of the housing 1 is provided with the second magnetic members 4 corresponding to the first magnetic members 3, that is, the number of the second magnetic members 4 is also single and is disposed opposite to the first magnetic members 3. Of course, the number of the first magnetic members 3 may also be set to be a plurality of, the plurality of first magnetic members 3 are uniformly distributed on the diaphragm 2, and at this time, the second end of the casing 1 is provided with the second magnetic members 4 corresponding to the first magnetic members 3 one to one. It should be noted that the positions and the numbers of the first magnetic members 3 and the second magnetic members 4 are not limited by the drawings.
Example 2
The structure and principle of the sound insulation device with adjustable acoustic characteristics in this embodiment are the same as those in embodiment 1, and details are not repeated in this embodiment.
The difference is that the second magnetic member 4 is driven by a gear, specifically, a receiving hole is formed in a side wall of the mounting sleeve 6, the gear is rotatably disposed in the receiving hole, and a tooth groove cooperatively connected with the gear is disposed on the second magnetic member 4. Therefore, when the distance between the second magnetic member 4 and the first magnetic member 3 needs to be reduced, the gear is rotated clockwise, and as the tooth groove of the second magnetic member 4 is continuously engaged with the gear, the second magnetic member 4 gradually extends out of the mounting sleeve 6, that is, the second magnetic member 4 is continuously close to the first magnetic member 3. On the contrary, when the distance between the second magnetic member 4 and the first magnetic member 3 needs to be increased, the gear is rotated counterclockwise, and as the tooth groove of the second magnetic member 4 is continuously engaged with the gear, the second magnetic member 4 is gradually inserted into the mounting sleeve 6, that is, at this time, the second magnetic member 4 is continuously away from the first magnetic member 3.
Example 3
The structure and principle of the sound insulation device with adjustable acoustic characteristics in this embodiment are the same as those in embodiment 1, and details are not repeated in this embodiment.
The difference is that the second magnetic member 4 is driven by a piston rod in this embodiment, specifically, the second magnetic member 4 is slidably inserted into one end of the mounting sleeve 6 facing the first magnetic member 3, and a piston rod is fitted into one end of the mounting sleeve 6 facing away from the first magnetic member 3, and is used for pushing the second magnetic member 4 to move towards the first magnetic member 3. Therefore, when the distance between the second magnetic part 4 and the first magnetic part 3 needs to be reduced, only the piston push rod needs to be pushed. At this time, as the length of the piston rod extending into the mounting sleeve 6 increases, the second magnetic member 4 will gradually approach the first magnetic member 3 under the pushing of the piston rod. On the contrary, when the distance between the second magnetic part 4 and the first magnetic part 3 needs to be increased, the piston push rod only needs to be pulled out. At this time, as the length of the piston rod extending into the mounting sleeve 6 is reduced, the second magnetic member 4 is gradually inserted into the mounting sleeve 6, i.e. away from the first magnetic member 3.
It should be noted that, in order to realize that the distance between the second magnetic member 4 and the first magnetic member 3 is adjustable, the manner of using the threaded connection, the screw driving, the gear driving or the piston-push rod driving does not limit the scope of protection of the present application, and other manners may be used to realize that the second magnetic member 4 approaches or moves away from the first magnetic member 3.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A sound insulation device with adjustable acoustic characteristics is characterized by comprising a shell with a hollow interior, wherein a first end of the shell is open, a vibrating diaphragm covers the open, and the vibrating diaphragm is provided with a first magnetic part; and a second magnetic part which is mutually attracted or repelled with the first magnetic part is arranged at the second end of the shell, and the distance between the second magnetic part and the first magnetic part is adjustable so as to realize the broadband adjustment of the sound insulation characteristic of the sound insulation device.
2. The acoustic adjustable property sound insulator of claim 1 wherein said first magnetic member comprises a lightweight sheet of iron or magnetic sheet.
3. The acoustic adjustable characteristic sound insulator of claim 1 further comprising a mounting sleeve for inserting said second magnetic member, said housing second end having an opening, said mounting sleeve being suspended within said opening by a plurality of spokes.
4. The acoustic property-adjustable sound insulation device according to claim 3, wherein the inner wall of the mounting sleeve is provided with an internal thread, and the outer wall of the second magnetic member is provided with an external thread which is matched with the internal thread.
5. The acoustical property-adjustable sound insulator of claim 3 wherein the second magnetic member has graduations along its length.
6. The acoustic adjustable property sound insulator of claim 3 wherein a plurality of said spokes are arranged in series in a circumferential direction of said mounting sleeve.
7. The sound insulation device with adjustable acoustic characteristics according to any one of claims 1 to 6, wherein the number of the first magnetic members is single, and the second end of the housing is provided with the second magnetic member corresponding to the first magnetic member.
8. The sound insulator of adjustable acoustic characteristics of any one of claims 1 to 6, wherein the number of the first magnetic members is plural, and the second end of the housing is provided with the second magnetic members in one-to-one correspondence with the first magnetic members.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921371018.7U CN210805213U (en) | 2019-08-22 | 2019-08-22 | Sound insulation device with adjustable acoustic characteristics |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921371018.7U CN210805213U (en) | 2019-08-22 | 2019-08-22 | Sound insulation device with adjustable acoustic characteristics |
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| CN210805213U true CN210805213U (en) | 2020-06-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110415675A (en) * | 2019-08-22 | 2019-11-05 | 北京市劳动保护科学研究所 | The sound arrester of adjustable acoustic characteristic |
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- 2019-08-22 CN CN201921371018.7U patent/CN210805213U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110415675A (en) * | 2019-08-22 | 2019-11-05 | 北京市劳动保护科学研究所 | The sound arrester of adjustable acoustic characteristic |
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