CN216954836U

CN216954836U - Noise reduction box and acoustic testing equipment

Info

Publication number: CN216954836U
Application number: CN202220259331.7U
Authority: CN
Inventors: 靳鑫鑫; 朱创
Original assignee: Suzhou HYC Technology Co Ltd
Current assignee: Suzhou HYC Technology Co Ltd
Priority date: 2022-02-08
Filing date: 2022-02-08
Publication date: 2022-07-12
Anticipated expiration: 2032-02-08

Abstract

The utility model relates to a noise reduction box and acoustic testing equipment, wherein the noise reduction box comprises: the box body comprises an inner box body and an outer box body, the outer box body covers the outer side of the inner box body and is arranged at intervals, the outer box body comprises an upper outer box and a lower outer box, and the inner box body comprises an upper inner box and a lower inner box; the upper outer box and the upper inner box are flexibly connected into an upper box body through at least one gel seat, and the lower outer box and the lower inner box are flexibly connected into a lower box body through at least one gel seat; the upper box body covers the lower box body, and a sealing gasket is arranged between the upper box body and the lower box body; the damping sound insulation felt is arranged on the opposite side walls of the inner box body and the outer box body; the sound absorption cotton is arranged on the side wall of the inner box body, the gel seat can buffer external vibration, the sealing gasket can buffer the external vibration, and the buffering and shock insulation effect is good; the material centering low frequency sound of damping sound insulation felt has good wall effect, can effectively prevent sound entering interior box, simultaneously, inhales the sound cotton and can absorb sound to make noise reduction better.

Description

Noise reduction box and acoustic testing equipment

Technical Field

The utility model relates to the technical field of acoustic test equipment, in particular to a noise reduction box and acoustic test equipment.

Background

In the electroacoustic industry, background noise refers to all signals which are irrelevant to an information source and appear in communication, and the signals come from a channel and have an interference effect on the signals, so that information is deformed and distorted in a transmission process, and the transmission efficiency is influenced, so that an electroacoustic product needs to adopt acoustic testing equipment for electroacoustic measurement before leaving a factory to ensure the product quality.

At present, in order to realize the test of the background noise of an electroacoustic product in the production test process, a noise reduction box needs to be arranged in an acoustic test device, and the electroacoustic product is arranged in the noise reduction box, so that the test of the electroacoustic product is in a relatively quiet environment to eliminate adverse factors, and a better test effect is achieved. But the noise insulation effect of the noise reduction box is poor due to the noise of the production workshop of the electroacoustic products, and the accuracy of the test data of the electroacoustic products is influenced. And the noise interference generated by the mechanical vibration of the acoustic testing equipment is large, and the accuracy of the testing data of the electroacoustic product is also influenced.

Therefore, it is important to provide a noise reduction box and an acoustic testing apparatus capable of ensuring the accuracy of the test data of the electroacoustic product.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a noise reduction box and an acoustic testing apparatus, which can ensure the accuracy of the test data of the electroacoustic product.

The present invention provides a noise reduction box, comprising:

the box body comprises an inner box body and an outer box body, the outer box body covers the outer side of the inner box body and is arranged at intervals, the outer box body comprises an upper outer box and a lower outer box, and the inner box body comprises an upper inner box and a lower inner box;

the upper outer box and the upper inner box are flexibly connected into an upper box body through at least one gel seat, and the lower outer box and the lower inner box are flexibly connected into a lower box body through at least one gel seat;

the upper box body covers the lower box body, and the sealing gasket is arranged between the upper box body and the lower box body;

the damping sound insulation felt is arranged on the opposite side walls of the inner box body and the outer box body;

inhale the sound cotton, set up on the lateral wall of interior box.

In the noise reduction box, the upper outer box and the upper inner box are flexibly connected through the gel seat, the lower outer box and the lower inner box are also flexibly connected through the gel seat, the gel seat can buffer external vibration, so that the buffering and shock insulation effects of the box body are better, meanwhile, the sealing gasket between the upper box body and the lower box body enables the upper box body and the lower box body to be flexibly connected, the sealing gasket can buffer the external vibration on the sealing basis, so that the buffering and shock insulation effects of the box body are better, and the noise which can enter the box body is smaller; the material self of damping sound insulation felt has good wall effect to low frequency sound, can effectively prevent sound entering interior box, simultaneously, inhales the sound cotton and can absorb the sound that enters into outer box and/or interior box to make noise reduction better.

In one embodiment, the gel holder includes a gel bushing and a plurality of first fasteners, the gel bushing includes a first sleeve body and a second sleeve body, wherein:

the outer side of the first sleeve is provided with a first slot along the circumferential direction of the first sleeve, and a first through hole is formed along the axial direction of the first slot;

the first fastener penetrates through the first through hole and fixes the first sleeve body on the inner side of the upper outer box;

one end of the second sleeve body is inserted into the first slot, and the other end of the second sleeve body is fixed to the outer side of the upper inner box through the first fastening piece.

In one embodiment, the gel holder comprises a gel and two sets of coupling assemblies, the coupling assemblies comprising a support plate, a stud and a nut, wherein:

the two supporting plates are respectively fixedly connected with two end parts of the gel along the axis of the gel;

the screw studs are fixed on one side, away from the gel, of the supporting plate, one screw stud is fixedly connected with the lower inner box through one nut, and the other screw stud is fixedly connected with the lower outer box through the other nut.

In one embodiment, the sealing pad comprises a first pad body and a second pad body, opposite end portions of the upper outer box and the lower outer box are in concave-convex fit, opposite end portions of the upper inner box and the lower inner box are in stepped fit, the first pad body is sleeved on the protruding portion of the upper outer box and covers the end face of the upper inner box, and the second pad body is sleeved on the protruding portion of the lower outer box and covers the end face of the lower inner box.

In one embodiment, the damping sound-insulating felt comprises a first damping sound-insulating felt, a latticed first groove is formed in the side wall, facing the inner box, of the outer box, and the first damping sound-insulating felt is attached to the inside of the first groove; and/or;

the damping sound-insulation felt comprises a second damping sound-insulation felt, the inner box body faces the side wall of the outer box body, a latticed second groove is formed in the side wall of the outer box body, and the second damping sound-insulation felt is attached to the inside of the second groove.

In one embodiment, the sound absorption cotton comprises first sound absorption cotton, and the first sound absorption cotton is fixed on the side wall of the inner box body facing the outer box body; and/or;

inhale the sound cotton including the second and inhale the sound cotton, the second is inhaled the sound cotton and is fixed in the inner wall of interior box.

In one embodiment, the damping and sound-insulating felt is arranged on the inner wall of the outer box body, and is sequentially stacked with the sound-absorbing cotton on the outer wall of the inner box body, and the damping and sound-insulating felt on the inner wall of the outer box body and the sound-absorbing cotton are arranged at intervals.

In addition, the utility model also provides acoustic testing equipment which comprises a testing main body and the noise reduction box in any technical scheme, wherein the noise reduction box is fixed on the workbench in the testing main body.

In the acoustic testing equipment, the upper outer box and the upper inner box in the noise reduction box are flexibly connected through the gel seat, the lower outer box and the lower inner box are also flexibly connected through the gel seat, the gel seat can buffer external vibration, so that the box body has a good buffering and shock insulation effect, meanwhile, the sealing gasket between the upper box body and the lower box body enables the upper box body and the lower box body to be flexibly connected, the sealing gasket can buffer the external vibration on the sealing basis, so that the box body has a good buffering and shock insulation effect, and therefore noise generated by vibration of the testing main body is only small and can enter the box body and is not influenced by the external vibration; the material self of damping sound insulation felt has good wall effect to low frequency sound, can effectively prevent sound entering interior box, simultaneously, inhales the sound cotton and can absorb the sound that enters into outer box and/or interior box to make noise reduction better. Therefore, the acoustic testing equipment with the noise reduction box has a good noise reduction effect, and the accuracy of test data of electroacoustic products can be ensured.

In one embodiment, the acoustic testing apparatus further comprises a self-disengaging device spaced apart on the table, the self-disengaging device comprising a linear die set, a connecting plate, a guide shaft, and a guide block, wherein:

the guide block is fixed on the outer side of the upper box body, and a guide hole matched with the guide shaft is formed in one side, facing the lower box body, of the guide block;

the linear module is arranged on the workbench, is connected with the connecting plate and is used for driving the connecting plate to reciprocate along the vertical direction;

two the connecting plate sets up relatively, and deviates from one side of workstation is provided with the guiding axle.

In one embodiment, the acoustic test equipment further comprises a limiting and fixing device, the limiting and fixing device comprises a plurality of limiting blocks, the limiting blocks are arranged along the periphery of the lower box body and fixed on the workbench, a polyurethane layer is arranged at the end part, close to the lower box body, of each limiting block, and a polyurethane pad is arranged on the workbench in a region surrounded by the limiting blocks.

Drawings

FIG. 1 is a top view of a noise reduction box according to the present invention;

FIG. 2 is a cross-sectional view of the noise attenuation box of FIG. 1 at location A-A;

FIG. 3 is an enlarged schematic view of the area B of the noise reduction box of FIG. 2;

FIG. 4 is an enlarged schematic view of region C of the noise reduction box of FIG. 2;

FIG. 5 is a schematic structural diagram of an acoustic testing apparatus according to the present invention;

FIG. 6 is a schematic structural diagram of the acoustic testing apparatus provided by the present invention, with the test body removed, and the module covered in the case;

FIG. 7 is a schematic structural diagram of the acoustic testing apparatus according to the present invention, with the test body removed, and the module opened in the case;

FIG. 8 is an enlarged schematic view of region D of the module of FIG. 6 with the acoustic testing apparatus removed from the test body.

Reference numerals:

01. acoustic test equipment;

10. a noise reduction box;

100. a box body; 110. an inner box body; 111. an upper inner box; 112. a lower inner box; 120. an outer case; 121. an upper outer box; 122. a lower outer box; 130. an upper box body; 140. a lower box body;

200. a gel seat; 210. a gel liner; 211. a first sleeve body; 2111. a first slot; 2112. a first through hole; 212. a second sleeve body; 220. a first fastener; 230. a gel; 240. a coupling assembly; 241. a support plate; 242. a stud; 243. a nut;

300. a gasket; 310. a first pad body; 320. a second pad body;

400. damping sound insulation felt; 410. a first damping sound insulation felt; 420. a second damping sound insulation felt;

500. sound-absorbing cotton; 510. a first sound absorbing cotton; 520. the second sound-absorbing cotton;

600. a support table;

20. testing the subject; 21. a work table;

30. a self-disengaging device; 31. a linear module; 32. a connecting plate; 33. a guide shaft; 34. a guide block; 35. a guide hole;

40. a limiting and fixing device; 41. a limiting block; 42. a polyurethane layer; 43. a polyurethane pad.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

The technical scheme provided by the embodiment of the utility model is described in the following with reference to the accompanying drawings.

As shown in fig. 1, 2, 3 and 4, the present invention provides a noise reduction box 10, the noise reduction box 10 is used for ensuring that an electroacoustic product is in a relatively quiet environment during a production test, the noise reduction box 10 includes a box body 100, a plurality of gel bases 200, a sealing pad 300, a damping and sound-insulating felt 400 and sound-absorbing cotton 500, the number of the gel bases 200 may be two, three, four or more, the electroacoustic product may be directly placed inside the box body 100, of course, the noise reduction box 10 may further include a support table 600, the support table 600 is fixed inside the box body 100 by screws, and the electroacoustic product is disposed on the support table 600.

The box body 100 may be made of a metal material, so that the box body 100 can also play a role of electromagnetic shielding while ensuring sound insulation, and of course, the material of the box body 100 is not limited thereto, and may be other materials capable of meeting the requirements. This box 100 includes interior box 110 and outer box 120, and outer box 120 covers establishes in the interior box 110 outside to interval setting between outer box 120 and the interior box 110, outer box 120 includes outer container 121 and outer container 122 down, and interior box 110 includes inner box 111 and lower inner box 112, goes up outer container 121 and corresponds the lid and closes under on outer container 122, goes up inner box 111 and corresponds the lid and close under on inner box 112.

The upper outer box 121 and the upper inner box 111 are flexibly connected into a whole through at least one gel holder 200, the upper outer box 121 and the upper inner box 111 form an upper box body 130, the lower outer box 122 and the lower inner box 112 are flexibly connected into a whole through at least one gel holder 200, and the lower outer box 122 and the lower inner box 112 form a lower box body 140; in a specific arrangement, the number of the gel bases 200 in the upper case 130 may be one, two, three, or more than three, the number of the gel bases 200 in the lower case 140 may be one, two, three, or more than three, and the number of the gel bases 200 in the upper case 130 and the number of the gel bases 200 in the lower case 140 may be the same or different.

The upper case 130 covers the lower case 140, and a gasket 300 is disposed between the upper case 130 and the lower case 140. In specific arrangement, the material of the sealing gasket 300 may be rubber or asbestos, or other materials capable of meeting the requirements, so that the sealing and buffering effects can be achieved; the gasket 300 may be provided only on the upper case 130, or the gasket 300 may be provided only on the lower case 140, or the gaskets 300 may be provided on both the upper case 130 and the lower case 140.

The damping and sound insulation felt 400 is arranged on the opposite side walls of the inner box body 110 and the outer box body 120; when specifically setting up, damping sound-proof felt 400 uses the meticulous iron powder of high purity to prepare and form as the raw materials, has the effect that the shock attenuation is syllable-dividing, can only set up damping sound-proof felt 400 on the outer wall of inner box 110, perhaps, can only set up damping sound-proof felt 400 on the inner wall of outer box 120, perhaps, can set up damping sound-proof felt 400 on the outer wall of inner box 110 and the inner wall of outer box 120 simultaneously, and multilayer damping sound-proof felt 400 can make the noise reduction effect better.

Inhale on the lateral wall of sound cotton 500 setting at inner box 110, when specifically setting up, inhale sound cotton 500 as an artificial inorganic fiber, the sound absorption rate is high, and sound insulation performance is good, can only set up on inner box 110's the outer wall and inhale sound cotton 500, perhaps, can only set up on inner box 110's the inner wall and inhale sound cotton 500, perhaps, can set up on inner box 110's the outer wall and inner box 110's the inner wall at inner box 110 simultaneously and inhale sound cotton 500, and the cotton 500 of multilayer inhaling can make noise reduction better.

In the noise reduction box 10, the upper outer box 121 and the upper inner box 111 are flexibly connected through the gel base 200, the lower outer box 122 and the lower inner box 112 are also flexibly connected through the gel base 200, the gel base 200 can buffer external vibration, so that the buffering and shock insulation effects of the box body 100 are good, meanwhile, the sealing gasket 300 between the upper box body 130 and the lower box body 140 enables the upper box body 130 and the lower box body 140 to be flexibly connected, the sealing gasket 300 can buffer external vibration on the basis of sealing, so that the buffering and shock insulation effects of the box body 100 are good, and therefore noise which can enter the box body 100 is small; the damping sound insulation felt 400 has excellent partition effect on the middle and low frequency sound, and can effectively prevent the sound from entering the inner box 110, and meanwhile, the sound absorption cotton 500 can absorb the sound entering the outer box 120 and/or the inner box 110, so that the noise reduction effect is good.

The gel holder 200 has a plurality of structural forms, and in a preferred embodiment, as shown in fig. 3, the gel holder 200 includes a gel lining 210 and a plurality of first fastening members 220, the number of the first fastening members 220 may be two, three, four or more, the gel lining 210 includes a first sleeve body 211 and a second sleeve body 212, wherein:

a first slot 2111 is formed in the outer side of the first sleeve 211 along the circumferential direction of the first sleeve, and a first through hole 2112 is formed in the first sleeve 211 along the axial direction of the first sleeve; when specifically setting up, the first cover body 211 is the ellipsoid structure, and first slot 2111 is seted up in the lateral surface of first cover body 211, and sets up around the axis of first cover body 211 to first slot 2111 extends certain distance towards the inside of first cover body 211, and first through-hole 2112 opens in the outer terminal surface of first cover body 211, and runs through first cover body 211 along the axial of first cover body 211.

The first fastening member 220 penetrates the first through hole 2112, and the first fastening member 220 fixes the first housing 211 to the inside of the upper outer case 121; when the outer box 121 is specifically arranged, the inner wall of the upper outer box 121 is provided with a threaded hole, the first fastening member 220 may be a screw only, and the first fastening member 220 may also be a screw and a gasket, and of course, the structural form of the first fastening member 220 is not limited thereto, and may also be other forms capable of meeting the requirements.

One end of the second housing 212 is inserted into the first slot 2111, and the other end of the second housing 212 is fixed to the outside of the upper inner box 111 by the first fastening member 220. When the structure is specifically arranged, a threaded hole is formed in the outer wall of the upper inner box 111, the first fastening member 220 may be a screw only, and the first fastening member 220 may also be a screw and a gasket, and of course, the structural form of the first fastening member 220 is not limited thereto, and may also be other forms capable of meeting the requirements.

In the noise reduction box 10, the first sleeve 211 is fixed to the inner side of the upper outer box 121 through the first fastening member 220, one end of the second sleeve 212 is inserted into the first insertion slot 2111, and the other end of the second sleeve 212 is fixed to the outer side of the upper inner box 111 through the first fastening member 220, so that the flexible connection between the upper outer box 121 and the upper inner box 111 can be conveniently realized.

The structure of the gel holder 200 has various forms, and in a preferred embodiment, as shown in fig. 4, the gel holder 200 comprises a gel 230 and two sets of coupling assemblies 240, each set of coupling assemblies 240 comprises a supporting plate 241, a stud 242 and a nut 243, wherein:

the two supporting plates 241 are respectively fixedly connected with the two end parts of the gel 230 along the axial line thereof; in a specific arrangement, the supporting plate 241 may be adhered to the end of the gel 230, or may be fixed to the end of the gel by other means.

The studs 242 are fixed on one side of the support plate 241, which faces away from the gel 230, one stud 242 is fixedly connected with the lower inner box 112 through a nut 243, and the other stud 242 is fixedly connected with the lower outer box 122 through another nut 243; in particular arrangements, the centre line of the two threads may coincide with the centre line of the gel 230.

In the noise reduction box 10, the lower inner box 112 and the lower outer box 122 are respectively provided with a threaded hole, the gel holder 200 and the lower outer box 122 are fixed integrally by the studs 242 and the nuts 243, and similarly, the gel holder 200 and the lower inner box 112 are fixed integrally by another set of studs 242 and nuts 243, so that the flexible connection between the lower outer box 122 and the lower inner box 112 can be realized more conveniently.

It should be noted that the gel holders 200 of the lower outer box 122 and the lower inner box 112, the upper outer box 121 and the upper inner box 111 have the same structure, and any one of the two gel holders 200 can be adopted, for example, the gel holders 200 of the lower outer box 122 and the lower inner box 112, the upper outer box 121 and the upper inner box 111 can be gel 230 and two sets of coupling assemblies 240; the lower outer box 122 and the lower inner box 112, and the upper outer box 121 and the upper inner box 111 may also adopt different structures of the two gel holders 200, for example, the gel holders 200 of the upper outer box 121 and the upper inner box 111 may be a gel 230 and two sets of coupling assemblies 240, and the gel holders 200 of the lower outer box 122 and the lower inner box 112 may be a gel bushing 210 and a plurality of first fasteners 220.

The structure of the gasket 300 has various forms, as shown in fig. 2, in a preferred embodiment, the gasket 300 includes a first gasket 310 and a second gasket 320, opposite ends of the upper outer box 121 and the lower outer box 122 are engaged in a concave-convex manner, opposite ends of the upper inner box 111 and the lower inner box 112 are engaged in a stepped manner, the first gasket 310 is fitted over the protrusion of the upper outer box 121, the first gasket 310 covers the end surface of the upper inner box 111, the second gasket 320 is fitted over the protrusion of the lower outer box 122, and the second gasket 320 covers the end surface of the lower inner box 112.

In the noise reduction box 10, the opposite ends of the upper outer box 121 and the lower outer box 122 are in concave-convex fit, and the opposite ends of the upper inner box 111 and the lower inner box 112 are in stepped fit, so that the upper box body and the lower box body 140 can be well limited, the upper outer box 121 and the lower outer box 122 can be conveniently covered, and the first pad body 310 and the second pad body 320 are matched, so that the sealing effect of the sealing element can be improved. Of course, the gasket 300 is not limited to this configuration, and may be configured in other forms that can meet the requirements, for example, the opposite end portions of the upper outer box 121 and the lower outer box 122 are fitted in a stepped manner, and the opposite end portions of the upper inner box 111 and the lower inner box 112 are fitted in a concave-convex manner.

As shown in fig. 2, in a preferred embodiment, the damping sound-proof felt 400 includes a first damping sound-proof felt 410, a latticed first groove is formed in a side wall of the outer box 120 facing the inner box 110, and the first damping sound-proof felt 410 is attached in the first groove; when the damping sound-insulation felt is specifically arranged, the first groove is opened on the surface, facing the inner box 110, of the outer box 120, and extends for a certain distance towards the outer box 120, the shape of the first groove is not limited to be in a grid shape, and other modes capable of meeting requirements can also be adopted, and the first damping sound-insulation felt 410 can be fixed in the first groove by attaching, and can also be fixed in the first groove by other modes such as clamping; and/or;

the damping and sound-insulating felt 400 includes a second damping and sound-insulating felt 420, a latticed second groove is formed in the side wall of the inner box 110 facing the outer box 120, and the second damping and sound-insulating felt 420 is attached in the second groove. When the damping sound-insulation felt is specifically arranged, the opening of the second groove is formed in the surface, facing the outer box body 120, of the inner box body 110, and extends for a certain distance towards the inner box body 110, the shape of the second groove is not limited to be latticed, and other modes capable of meeting requirements can be adopted, and the second damping sound-insulation felt 420 can be fixed in the second groove through attachment, and can also be fixed in the second groove through other modes such as clamping.

In the noise reduction box 10, the first damping sound-insulating felt 410 may be only arranged on the side wall of the outer box body 120 facing the inner box body 110, or the second damping sound-insulating felt 420 may be only arranged on the side wall of the inner box body 110 facing the outer box body 120, between the outer box body 120 and the inner box body 110. The first damping sound-insulating felt 410 on the side wall of the outer box body 120 facing the inner box body 110 and the second damping sound-insulating felt 420 on the side wall of the inner box body 110 facing the outer box body 120 can be simultaneously arranged between the outer box body 120 and the inner box body 110, so that the sound-insulating effect is better.

The sound absorption wool 500 has various structural forms, and in a preferred embodiment, as shown in fig. 2, the sound absorption wool 500 includes a first sound absorption wool 510, and the first sound absorption wool 510 is fixed to a side wall of the inner box 110 facing the outer box 120; when the sound absorption structure is specifically arranged, the fixing mode between the first sound absorption cotton 510 and the side wall of the inner box body 110 can be bonding, clamping and the like, and can also be other modes capable of meeting the requirements; and/or;

the sound-absorbing cotton 500 comprises a second sound-absorbing cotton 520, and the second sound-absorbing cotton 520 is fixed on the inner wall of the inner box 110; when specifically setting up, the fixed mode between the cotton 520 of inhaling sound and the lateral wall of interior box 110 can be for bonding, joint etc. still can be for other modes that can satisfy the requirement.

In the noise reduction box 10, the first sound absorbing cotton 510 may be disposed only on the side wall of the inner box 110 facing the outer box 120, and the second sound absorbing cotton 520 may be disposed only on the inner wall of the inner box 110, both of which facilitate the installation of the sound absorbing cotton 500. The first sound-absorbing cotton 510 and the second sound-absorbing cotton 520 can be arranged on the inner wall of the inner box 110 facing the side wall of the outer box 120 of the inner box 110, so that the sound-absorbing effect is better.

In order to further improve the noise reduction effect, in a preferred embodiment, as shown in fig. 2, a damping and sound insulation felt 400 is disposed on the inner wall of the outer box 120, and the damping and sound insulation felt 400 and the sound absorption cotton 500 are sequentially stacked on the outer wall of the inner box 110, and the damping and sound insulation felt 400 on the inner wall of the outer box 120 and the sound absorption cotton 500 are spaced apart from each other, so that a cavity is formed between the damping and sound insulation felt 400 and the sound absorption cotton 500, and thus noise reduction can be effectively performed.

In addition, as shown in fig. 5, the present invention further provides an acoustic testing device 01 for testing the background noise of the electroacoustic product during the production test, the acoustic testing device 01 includes a testing main body 20, and further includes a noise reduction box 10 according to any one of the above technical solutions, and the noise reduction box 10 is fixed on a workbench 21 inside the testing main body 20.

In the acoustic testing device 01, because the upper outer box 121 and the upper inner box 111 of the noise reduction box 10 are flexibly connected through the gel base 200, the lower outer box 122 and the lower inner box 112 are also flexibly connected through the gel base 200, the gel base 200 can buffer external vibration, so that the buffering and shock insulation effects of the box 100 are good, meanwhile, the sealing gasket 300 between the upper box 130 and the lower box 140 enables the upper box 130 and the lower box 140 to be flexibly connected, and the sealing gasket 300 can buffer external vibration on the basis of sealing, so that the buffering and shock insulation effects of the box 100 are good, so that only small noise generated by vibration of the testing main body 20 can enter the box 100 and is not influenced by external vibration; the damping sound insulation felt 400 has excellent partition effect on the middle and low frequency sound, and can effectively prevent the sound from entering the inner box 110, and meanwhile, the sound absorption cotton 500 can absorb the sound entering the outer box 120 and/or the inner box 110, so that the noise reduction effect is good. Therefore, the acoustic testing equipment 01 with the noise reduction box 10 has good noise reduction effect, and can ensure the accuracy of test data of electroacoustic products.

In order to realize the automatic opening and closing of the upper case 130 and the lower case 140, as shown in fig. 6, 7 and 8, in a preferred embodiment, the acoustic testing apparatus 01 further includes a self-disengaging device 30, and when the arrangement is specific, the number of the self-disengaging devices 30 may be one, and the number of the self-disengaging devices 30 may also be plural. The self-disengaging device 30 is arranged on the workbench 21 at intervals, the self-disengaging device 30 comprises a linear module 31, a connecting plate 32, a guide shaft 33 and a guide block 34, wherein:

the guide block 34 is fixed on the outer side of the upper box body 130 through clamping, threaded connection and the like, a guide hole 35 is formed in one side, facing the lower box body 140, of the guide block 34, the guide hole 35 is opened on the surface, facing the lower box body 140, of the guide block 34 and extends for a certain distance towards the interior of the guide block 34, and the guide hole 35 is matched with the guide shaft 33;

the linear module 31 is arranged on the workbench 21 in a clamping manner, a threaded connection manner and the like, the linear module 31 is connected with the connecting plate 32 in a clamping manner, a threaded connection manner and the like, and the linear module 31 is used for driving the connecting plate 32 to reciprocate along the vertical direction;

two connecting plates 32 set up relatively to two connecting plates 32 are crossed modes such as joint, threaded connection and are provided with guiding axle 33 in deviating from one side of workstation 21, or, connecting plate 32 and guiding axle 33 integrated into one piece.

In the acoustic testing apparatus 01, the linear module 31 moves to drive the connecting plate 32 to move upwards along the vertical direction, the connecting plate 32 drives the guide shaft 33 to move upwards, the guide shaft 33 is inserted into the guide hole 35 and continues to move upwards to lift the upper case 130 to a certain height, after a product to be tested is placed, the linear module 31 moves reversely to drive the connecting plate 32 to move downwards along the vertical direction, the connecting plate 32 drives the guide shaft 33 to move downwards, the upper case 130 moves downwards along with the guide shaft, so that the upper case 130 covers the lower case 140, the linear module 31 continues to move reversely, so that the connecting plate 32 drives the guide shaft 33 to move downwards continuously, so that the guide shaft 33 and the guide hole 35 are separated, and then the test is started, therefore, the automatic opening and closing of the upper case 130 and the lower case 140 can be conveniently realized through the self-disengaging device 30 without manual operation, the operation is efficient, safe and convenient, and no rigid connection exists between the noise reduction box 10 and the test main body 20, so that a good shock insulation effect can be achieved.

In order to facilitate the noise reduction box 10 to be fixed on the workbench 21 inside the test main body 20, as shown in fig. 6 and 7, in a preferred embodiment, the acoustic test apparatus 01 further includes a limiting fixing device 40, the limiting fixing device 40 includes a plurality of limiting blocks 41, the number of the limiting blocks 41 may be two, three, four or more, the plurality of limiting blocks 41 are arranged along the periphery of the lower box 140, and the plurality of limiting blocks 41 are fixed on the workbench 21, and when specifically set, the limiting blocks 41 are fixed on the workbench 21, and the limiting blocks 41 are movable relative to the workbench 21; a polyurethane layer 42 is arranged at the end part of the limiting blocks 41 close to the lower box body 140, and a polyurethane cushion 43 is arranged on the workbench 21 in the area enclosed by the limiting blocks 41; through above-mentioned polyurethane layer 42 and polyurethane pad 43 can effectively completely cut off the vibrations that come from external world and acoustics test equipment 01 self for acoustics test equipment 01 noise reduction effect is better, can ensure the accuracy of electroacoustic product test data.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A noise attenuation tank, comprising:

inhale the sound cotton, set up on the lateral wall of interior box.

2. The noise reduction box of claim 1, wherein the gel mount comprises a gel bushing and a plurality of first fasteners, the gel bushing comprising a first sleeve body and a second sleeve body, wherein:

3. The noise reduction box of claim 1, wherein the gel mount comprises a gel and two sets of coupling assemblies comprising a support plate, a stud and a nut, wherein:

4. The noise reduction box according to claim 1, wherein the gasket comprises a first gasket and a second gasket, opposite ends of the upper outer box and the lower outer box are in concave-convex fit, opposite ends of the upper inner box and the lower inner box are in stepped fit, the first gasket is sleeved on the protruding portion of the upper outer box and covers the end surface of the upper inner box, and the second gasket is sleeved on the protruding portion of the lower outer box and covers the end surface of the lower inner box.

5. The noise reduction box according to claim 1, wherein the damping and sound insulation felt comprises a first damping and sound insulation felt, a latticed first groove is formed in the side wall, facing the inner box body, of the outer box body, and the first damping and sound insulation felt is attached to the inside of the first groove; and/or;

the damping sound-insulating felt comprises a second damping sound-insulating felt, the inner box body faces the side wall of the outer box body, a latticed second groove is formed in the side wall of the outer box body, and the second damping sound-insulating felt is attached to the inside of the second groove.

6. The noise reduction box according to claim 1, wherein the sound absorption cotton comprises first sound absorption cotton fixed on a side wall of the inner box body facing the outer box body; and/or;

7. The noise reduction box according to claim 1, wherein the damping and sound insulation felt is disposed on the inner wall of the outer box body, and is sequentially stacked with the sound absorption cotton on the outer wall of the inner box body, and the damping and sound insulation felt disposed on the inner wall of the outer box body and the sound absorption cotton are spaced apart from each other.

8. An acoustic testing apparatus comprising a test body, further comprising a noise reduction box according to any of claims 1 to 7, the noise reduction box being secured to a table inside the test body.

9. The acoustic testing apparatus of claim 8, further comprising self-disengaging means spaced apart on the table, the self-disengaging means comprising a linear die set, a connecting plate, a guide shaft, and a guide block, wherein:

10. The acoustic testing device according to claim 8, further comprising a limiting and fixing device, wherein the limiting and fixing device comprises a plurality of limiting blocks, the limiting blocks are arranged along the periphery of the lower box body and fixed on the workbench, a polyurethane layer is arranged at the end part of each limiting block close to the lower box body, and a polyurethane cushion is arranged on the workbench in an area surrounded by the limiting blocks.