A micro-slit continuously adjustable high-efficiency sound absorption device

Abstract

A kind of micro-gap type continuously adjustable sound absorption device, including shell, shell is the column structure of one end opening, other end closed and hollow inside, the cross section of shell inner cavity gradually decreases from its opening end to closed end;It also includes push-pull plate in the inner cavity of shell, push-pull plate is matched with the structure of closed end of shell inner cavity, push-pull plate is coaxial with shell, and push-pull plate moves along shell axis, the space between push-pull plate and closed end of shell is back cavity.By rational setting of component structure, when noise frequency band changes, by the movement of push-pull plate along the axis of shell, the gap with width change between push-pull plate and shell inner wall is generated, and the height of back cavity is also changed, i.e.the structure of acoustic resistance and acoustic reactance regulation can be completed simultaneously, new sound absorption parameters are given to the device, and the overall structure of the device and operation are simple, the range of continuously adjustable sound absorption is wide, and it has great application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of noise control, and in particular relates to a micro-slit type continuously adjustable sound absorbing device. Background Art

[0002] Sound-absorbing structures can effectively reduce equipment or environmental noise. Application scenarios include noise sources such as engine noise and acoustic resonance in-situ mixed noise, meeting people's needs for equipment and the environment. Although conventional sound-absorbing materials (porous sound-absorbing materials, etc.) can achieve good sound absorption effects at certain frequencies, once the noise environment changes, the original sound-absorbing materials or structures will be difficult to continue to apply; at the same time, for scenarios where the noise frequency of rotating machinery such as engines changes with the speed, it will be difficult to meet the sound absorption needs by using traditional sound-absorbing materials alone. Adjustable sound-absorbing structures can adjust the sound-absorbing structure in real time according to the frequency band of the noise to achieve better sound absorption effects, overcoming the problem that the sound absorption effect of traditional sound-absorbing materials or structures cannot be changed after the design is completed.

[0003] Existing adjustable sound absorption structures primarily utilize thin films made of piezoelectric materials or magnetorheological elastomers, achieving adjustable sound absorption through electrical / magnetic control of the film tension. However, in practice, these thin films are difficult to create and complex to control. Mechanically adjustable sound absorption typically utilizes separate structures to adjust the structural acoustic impedance and reactance. While achieving good sound absorption, this approach is relatively complex to control. Therefore, to overcome these shortcomings, it is necessary to develop a new continuously adjustable sound absorption structure. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to provide a micro-slit type continuously adjustable sound absorption device. Through the reasonable setting of the component structure, when the noise frequency band changes, the push-pull plate moves along the axis of the shell, and a gap of varying width is generated between the push-pull plate and the inner wall of the shell. At the same time, the height of the back cavity also changes, thereby simultaneously completing the regulation of structural acoustic resistance and acoustic reactance, giving the device new sound absorption parameters. At the same time, the overall structure and operation of the device are simple, the range of continuously adjustable sound absorption is wide, and it has great application prospects.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the present invention include:

[0006] A continuously adjustable sound-absorbing device comprises a shell, which is a cylindrical structure with an open end and a closed end and a hollow interior, and the cross-section of the shell cavity gradually decreases from the open end to the closed end; and further comprises a push-pull plate located in the shell cavity, the push-pull plate matching the structure of the closed end of the shell cavity, the push-pull plate being coaxial with the shell and moving along the axis of the shell, and the space between the push-pull plate and the closed end of the shell being a back cavity.

[0007] Furthermore, it also includes a push-pull rod located in the back cavity of the shell, a through hole is provided at the closed end of the shell, one end of the push-pull rod is connected to the push-pull plate, and the other end of the push-pull rod passes through the shell from the through hole, and the push-pull rod matches the through hole structure.

[0008] Preferably, the push-pull rod includes a connecting section and an extending section that are coaxially arranged, and the connecting section is connected to the push-pull plate.

[0009] Preferably, a slot is provided on one side of the push-pull plate close to the closed end of the shell, the connecting section is located in the slot, and the connecting section is connected to the push-pull plate through the slot.

[0010] Preferably, the push-pull rod is threadedly connected to the inner wall of the through hole, and the connecting section is in mechanical contact with the slot.

[0011] Preferably, the push-pull rod is coaxial with the housing.

[0012] Preferably, the cross section of the inner cavity of the shell is rectangular.

[0013] Preferably, one opposite surface of the inner cavity of the shell gradually approaches each other from the open end to the closed end of the shell, and the other opposite surface of the shell is parallel to the axis of the shell.

[0014] Preferably, the angle θ between one of the opposite surfaces of the housing and the perpendicular plane to the axis of the housing is 90.5°-95°.

[0015] Preferably, the open end of the shell is covered with a porous sound-absorbing plate.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) The micro-slit type continuously adjustable sound absorption device of the present invention, through the reasonable arrangement of the component structure, when the noise frequency band changes, the push-pull plate moves along the axis of the shell, and a gap of varying width is generated between the push-pull plate and the inner wall of the shell. At the same time, the height of the back cavity also changes, thereby completing the regulation of structural acoustic resistance and acoustic reactance at the same time, giving the device new sound absorption parameters. At the same time, the overall structure and operation of the device are simple, the range of continuously adjustable sound absorption is wide, and it has great application prospects.

[0018] (2) The micro-slit type continuously adjustable sound absorbing device of the present invention has a threaded connection between the push-pull rod and the inner wall of the through hole through a reasonable arrangement of the component structure. When the push-pull rod is rotated clockwise / counterclockwise, the push-pull rod moves up and down along the axis of the shell. While driving the push-pull plate to move linearly, the push-pull plate will not rotate with the rotation of the push-pull rod, which is convenient for operation.

[0019] (3) The micro-slit continuously adjustable sound absorption device of the present invention can achieve nearly perfect adjustable sound absorption effects at frequencies of 168 Hz, 291 Hz, 350 Hz, 464 Hz, and 583 Hz by rationally setting the component structure when the back cavity heights are 90 mm, 30 mm, 20 mm, 10 mm, and 5 mm, respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic structural diagram of the micro-slit continuously adjustable sound absorbing device of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the push-pull rod;

[0023] Figure 3 Schematic diagram of the adjustable sound absorption effect of the embodiment device.

[0024] The numbers in the figure represent:

[0025] 1. Shell; 2. Push-pull plate; 3. Card slot; 4. Push-pull rod; 4a. Connecting section; 4b. Extending section; 5. Porous sound-absorbing plate. DETAILED DESCRIPTION

[0026] The invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0027] It should be noted that the directional terms mentioned in this article, such as "inner cavity" and "inner wall", are consistent with the specific directions on the paper in the drawings of the specification or the corresponding directions of the space shown in the drawings; all components and equipment in the present invention, unless otherwise specified, are all components and equipment known in the prior art.

[0028] Example

[0029] like Figure 1 and Figure 2 As shown, this embodiment discloses a continuously adjustable sound absorption device, including a shell 1, which is a cylindrical structure with an open end and a closed end and a hollow interior. The cross-section of the inner cavity of the shell 1 gradually decreases from the open end to the closed end; and further includes a push-pull plate 2 located in the inner cavity of the shell 1. The push-pull plate 2 matches the structure of the closed end of the inner cavity of the shell 1. The push-pull plate 2 is coaxial with the shell 1 and moves along the axis of the shell 1. The space between the push-pull plate 2 and the closed end of the shell 1 is the back cavity 1-0.

[0030] Its function is as follows: the shell 1 is used to carry the sound-absorbing device of the present application, and the cross-section of the inner cavity of the shell 1 is gradually reduced from its open end to the closed end, so that when the push-pull plate 2 moves along the axis of the shell 1, a gap of varying width is generated between the push-pull plate 2 and the inner wall of the shell 1, and at the same time the height of the back cavity 1-0 is also changing, thereby adjusting the size of the structural acoustic resistance and structural acoustic reactance at the same time; when in use, the opening of the shell 1 is facing the noise source. When the noise frequency band changes, the structural acoustic resistance and acoustic reactance are regulated at the same time by moving the push-pull plate 2 along the axis of the shell 1, giving the device new sound absorption parameters. At the same time, the overall structure and operation of the device are simple, the range of continuously adjustable sound absorption is wide, and it has great application prospects.

[0031] The overall dimensions of the shell 1 of this embodiment are 100mm*100mm*100mm, the cross-section of the inner cavity of the shell 1 is rectangular, the opposite surfaces of the inner cavity of the shell 1 gradually approach each other from the open end to the closed end of the shell 1, and the distance between the opposite surfaces of the inner cavity of the shell 1 is a maximum of 99mm and a minimum of 98mm. The other opposite surfaces of the shell 1 are parallel to the axis of the shell 1, and the distance between the other opposite surfaces of the shell 1 is 98mm.

[0032] The size of the push-pull plate 2 in this embodiment is 98 mm*98 mm, and the thickness of the push-pull plate 2 is 1-10 mm, preferably 2 mm in this embodiment.

[0033] In this embodiment, the included angle θ between an opposite surface of the housing 1 and a plane perpendicular to the axis of the housing 1 is 90.5°.

[0034] Specifically, the open end of the shell 1 is covered with a porous sound absorbing plate 5;

[0035] Its function is as follows: the porous sound absorbing plate 5 is made of existing materials, which can not only achieve medium and high frequency sound absorption, but also prevent micro-slits from being blocked; the thickness of the porous sound absorbing plate 5 in this embodiment is preferably 10 mm.

[0036] Specifically, it also includes a push-pull rod 4 located in the back cavity 1-0 of the shell 1. A through hole is provided at the closed end of the shell 1. One end of the push-pull rod 4 is connected to the push-pull plate 2, and the other end of the push-pull rod 4 passes through the shell 1 from the through hole, and the push-pull rod 4 matches the through hole structure.

[0037] Its function is to push and pull the push-pull rod 4 to link the push-pull plate 2 of the present application to move up and down along the axis of the shell 1.

[0038] Specifically, the push-pull rod 4 includes a connecting section 4 a and an extending section 4 b that are coaxially arranged, and the connecting section 4 a is connected to the push-pull plate 2 .

[0039] Specifically, a slot 3 is provided on one side of the push-pull plate 2 close to the closed end of the housing 1, and a connecting section 4a is located in the slot 3, and the connecting section 4a is connected to the push-pull plate 2 through the slot 3; the push-pull rod 4 is threadedly connected to the inner wall of the through hole, and the connecting section 4a is in mechanical contact with the slot 3, and the push-pull rod 4 is coaxial with the housing 1;

[0040] Its function is as follows: the push-pull rod 4 is threadedly connected to the inner wall of the through hole, so that when the push-pull rod 4 is rotated clockwise / counterclockwise, the push-pull rod 4 moves up and down along the axis of the shell 1, and at the same time drives the push-pull plate 2 to move; the connecting section 4a is located in the slot 3, and the connecting section 4a is in mechanical contact with the slot 3, so that when the push-pull rod 4 rotates, the connecting section 4a of the push-pull rod 4 also rotates in the slot 3 (that is, mechanical contact), so that when the push-pull plate 2 moves along the axis of the shell 1, the push-pull plate 2 will not rotate with the rotation of the push-pull rod 4.

[0041] The push-pull rod 4 of this embodiment is 100 mm long and is provided with a scale, which allows the height of the back cavity 1 - 0 to be directly read.

[0042] The sound absorption effect of the continuously adjustable sound absorption device of this embodiment is calculated using conventional finite element simulation software. Figure 3 As shown in the figure, when the height of the back cavity 1-0 is 90mm, 30mm, 20mm, 10mm and 5mm respectively, the device can obtain a nearly perfect adjustable sound absorption effect at frequencies of 168Hz, 291Hz, 350Hz, 464Hz and 583Hz; that is, when the noise frequency band changes, the push-pull plate 2 moves along the axis of the shell 1, and the structural acoustic resistance and acoustic reactance are regulated at the same time, giving the device new sound absorption parameters. At the same time, the overall structure and operation of the device are simple, the range of continuously adjustable sound absorption is wide, and it has great application prospects.

[0043] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0044] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0045] In addition, the various different implementation methods disclosed in this solution can also be arbitrarily combined, as long as they do not violate the ideas of this disclosure, they should also be regarded as the contents of the invention of this disclosure.

Claims

1. A continuously adjustable sound absorbing device, characterized in that: The shell (1) comprises a cylindrical structure with one end open and the other end closed and hollow inside, and the cross section of the inner cavity of the shell (1) gradually decreases from the open end to the closed end; It also includes a push-pull plate (2) located in the inner cavity of the shell (1), the push-pull plate (2) matches the closed end structure of the inner cavity of the shell (1), the push-pull plate (2) is coaxial with the shell (1), and the push-pull plate (2) moves along the axis of the shell (1), and the space between the push-pull plate (2) and the closed end of the shell (1) is the back cavity (1-0); One opposite surface of the inner cavity of the shell (1) gradually approaches each other from the open end to the closed end of the shell (1), and the other opposite surface of the shell (1) is parallel to the axis of the shell (1).

2. The continuously adjustable sound absorbing device according to claim 1, characterized in that: It also includes a push-pull rod (4) located in the back cavity (1-0) of the shell (1), a through hole is provided at the closed end of the shell (1), one end of the push-pull rod (4) is connected to the push-pull plate (2), and the other end of the push-pull rod (4) passes through the shell (1) from the through hole, and the push-pull rod (4) matches the through hole structure.

3. The continuously adjustable sound absorbing device according to claim 2, characterized in that: The push-pull rod (4) comprises a coaxially arranged connecting section (4a) and an extending section (4b), and the connecting section (4a) is connected to the push-pull plate (2).

4. The continuously adjustable sound absorbing device according to claim 3, characterized in that: The push-pull plate (2) is provided with a slot (3) on one side of the closed end close to the shell (1); the connecting section (4a) is located in the slot (3), and the connecting section (4a) is connected to the push-pull plate (2) via the slot (3).

5. The continuously adjustable sound absorbing device according to claim 4, characterized in that: The push-pull rod (4) is threadedly connected to the inner wall of the through hole, and the connecting section (4a) is in mechanical contact with the slot (3).

6. The continuously adjustable sound absorbing device according to claim 5, characterized in that: The push-pull rod (4) is coaxial with the housing (1).

7. The continuously adjustable sound absorbing device according to any one of claims 1 to 6, characterized in that: The cross section of the inner cavity of the shell (1) is rectangular.

8. The continuously adjustable sound absorbing device according to claim 7, characterized in that: An included angle θ between an opposite surface of the shell (1) and a plane perpendicular to the axis of the shell (1) is 90.5°-95°.

9. The continuously adjustable sound absorbing device according to claim 1, wherein: The open end of the shell (1) is covered with a porous sound-absorbing plate (5).

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