Tool for testing sound absorption performance of silencing sheet

Abstract

The utility model relates to the technical field of silencing sheets, and discloses a tool for testing the sound absorption performance of a silencing sheet, which comprises a silencer and a fan device arranged on one side of the silencer, one side of the fan device is communicated with a connecting pipe, one end of the connecting pipe is communicated with a sound source protection box, an artificial sound source is arranged in the sound source protection box, and the artificial sound source is connected with the fan device. One side, far away from the connecting pipe, of the sound source protection box is communicated with a ventilation pipeline, one end of the ventilation pipeline is communicated with a test channel, and two symmetrical silencing sheet bodies are arranged at the corner of the test channel. Boundary conditions and dynamic working conditions of actual working conditions are simulated, experimental testing of the silencing piece under the actual working conditions is achieved, and the real silencing amount testing result of the silencing piece is guaranteed; acoustic testing of the silencing sheet under various working conditions such as dynamic working conditions, non-dynamic working conditions and dynamic working conditions with different parameters can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sound-absorbing sheet, specifically to a tool for testing sound-absorbing performance of sound-absorbing sheet. BACKGROUND

[0002] The sound-absorbing sheet is a device used in a channel to absorb noise in the channel and prevent the noise from spreading to the outside, while ensuring a certain flow area in the channel. In view of the current testing situation of the sound-absorbing sheet, the testing is generally carried out on the sound-absorbing sheet in a proportionally reduced manner due to the testing conditions and equipment, and is affected by the testing channel and the simulation of the actual working condition, so the testing result may have a large deviation from the sound-absorbing volume of the sound-absorbing sheet with the real size. The design and testing of the sound-absorbing sheet will have a great adverse effect. Meanwhile, for the sound-absorbing sheet with corner requirements, a certain arc surface is usually designed to realize the cooperation of the structure of the corner with the channel structure, and the testing of the sound-absorbing volume of the real size has a great influence. SUMMARY

[0003] The utility model aims at providing a tool for testing sound-absorbing performance of sound-absorbing sheet to solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a tool for testing sound-absorbing performance of sound-absorbing sheet, comprising a sound absorber, further comprising:

[0005] A fan device is arranged on one side of the sound absorber, one side of the fan device is communicated with a connecting pipe, one end of the connecting pipe is communicated with a sound source protection box, an artificial sound source is arranged in the sound source protection box, one side of the sound source protection box away from the connecting pipe is communicated with a ventilation duct, one end of the ventilation duct is communicated with a testing channel, and two symmetrical sound-absorbing sheet bodies are arranged at the corner of the testing channel.

[0006] Preferably, one side of the sound source protection box is fixedly provided with a sealing plate, one side of the sealing plate is fixedly provided with a positioning plate, the positioning plate is fixed to the inner wall of the sound source protection box, and one side of the positioning plate is fixedly provided with a clamping seat.

[0007] Preferably, one side of the sound source protection box is rotatably connected with a box door through a hinge, and one side of the box door is fixedly provided with a handle.

[0008] Preferably, the inner wall of the box door is provided with a lock cylinder, one end of the lock cylinder is rotatably connected with a clamping pin, and the clamping pin is clamped to the inner wall of the clamping seat.

[0009] Preferably, the bottom of the sound absorber is fixedly provided with a support, and the bottom of the fan device is fixedly provided with a supporting leg.

[0010] Preferably, the sound-absorbing piece body is composed of a force bearing frame, an internal sound-absorbing material and an external cover layer, and the test channel is composed of a channel body, a channel top cover plate, a sound source and an array type noise test device.

[0011] Preferably, the external cover panel material of the sound-absorbing piece body is a perforated plate structure, and the internal sound-absorbing material is ultra-fine centrifugal glass wool.

[0012] Compared with the prior art, the utility model has the beneficial effects as follows: the utility model through to the sound-absorbing piece with corner design actual matching size test channel's building, and simulating actual working condition's boundary condition, dynamic working condition, realize the experimental test of sound-absorbing piece under actual working condition, guarantee the real sound-absorbing volume test result of sound-absorbing piece;Can realize the acoustic test of sound-absorbing piece under dynamic working condition, non-dynamic working condition, different parameters dynamic working condition and multiple working conditions;When testing, according to actual test demand, by the regulation and control of dynamic equipment and fan equipment, can realize the stepless speed regulation of fan equipment from zero to maximum, can test the acoustic test of sound-absorbing piece under multiple working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The structure schematic view of a preferred embodiment of the test sound-absorbing performance tool provided by the utility model is shown in the figure;

[0014] Figure 2 The structure schematic view of the test channel provided by the utility model is shown in the figure;

[0015] Figure 3 The structure schematic view of the inside of the sound source protection box provided by the utility model is shown in the figure;

[0016] Figure 4 The structure schematic view of the connection of the pin and the socket provided by the utility model is shown in the figure;

[0017] Figure 5 The principle diagram of the sound-absorbing piece body test provided by the utility model is shown in the figure.

[0018] In the figure: 1, sound absorber;2, fan equipment;3, connecting pipe;4, sound source protection box;5, artificial sound source;6, ventilation duct;7, test channel;8, sound-absorbing piece body;9, sealing plate;10, positioning plate;11, socket;12, box door;13, handle;14, lock cylinder;15, pin;16, support;17, supporting leg. DETAILED DESCRIPTION

[0019] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] Please refer to Figures 1-5 As shown in FIG. 1, a kind of tool for testing sound-absorbing performance of sound-absorbing sheet, including muffler 1, muffler 1 is cylindrical resistive muffler, tail end is connected with fan equipment 2, to avoid the influence of environmental noise on test result;It further includes fan equipment 2 being set at one side of muffler 1, fan equipment 2 includes fan and supporting control equipment, can realize the start-stop and stepless speed control of fan;One side of fan equipment 2 is communicated with connecting pipe 3, connecting pipe 3 is used for connecting fan equipment 2 and sound source protection box 4 by being set;One end of connecting pipe 3 is communicated with sound source protection box 4, sound source protection box 4 is mainly set to avoid the influence of environmental noise on sound source, to ensure the stability of sound source noise value;Artificial sound source 5 is arranged in sound source protection box 4, artificial sound source 5 is installed in sound source protection box 4, and sound source is used to provide for testing noise;The side of sound source protection box 4 away from connecting pipe 3 is communicated with ventilation duct 6, and ventilation duct 6 is mainly used for the transmission of noise and ventilation;One end of ventilation duct 6 is communicated with test channel 7, test channel 7 is arranged between two sound-absorbing sheet bodies 8, and forms sealed space, and its front end is connected with ventilation duct 6, and tail end is connected with factory boundary environment;Two symmetrical sound-absorbing sheet bodies 8 are arranged at the corner of test channel 7, and the sound-absorbing sheet body 8 is mainly composed of force frame, internal sound-absorbing material and external facing layer, the material quality of the outer facing panel of sound-absorbing sheet body 8 is perforated plate structure, the internal sound-absorbing material is 24K ultrafine centrifugal glass wool, and the compression amount of 1:1.1 is ensured.

[0021] Please refer to Figures 1-5As shown, one side of the sound source protection box 4 is fixed with a sealing plate 9, one side of the sealing plate 9 is fixed with a positioning plate 10, the positioning plate 10 is fixed to the inner wall of the sound source protection box 4, one side of the positioning plate 10 is fixed with a clamping seat 11; One side of the sound source protection box 4 is rotatably connected with a box door 12 through a hinge, one side of the box door 12 is fixed with a handle 13; The inner wall of the box door 12 is provided with a lock core 14, one end of the lock core 14 is rotatably connected with a clamping pin 15, the clamping pin 15 is clamped in the inner wall of the clamping seat 11; The bottom of the muffler 1 is fixed with a support 16, and the bottom of the fan equipment 2 is fixed with a supporting leg 17; The sound absorbing piece body 8 is composed of a force bearing frame, an internal sound absorbing material and an external protective layer; The test channel 7 is composed of a channel body, a channel top cover plate, a sound source and an array type noise test equipment; The outer protective layer of the sound absorbing piece body 8 is a perforated plate structure, and the internal sound absorbing material is ultra-fine centrifugal glass wool; The array type microphone is mainly used for measuring noise value, and is respectively located at the rear end of the artificial sound source 5 in the sound source protection box 4 and the end of the test channel 7.

[0022] Working principle: when installing, first install each component to the designated position, ensure that there is no gap connected with the external environment at each connection surface, and all gaps are effectively plugged; Install the artificial sound source 5 (array speaker) at the front end of the sound absorbing piece body 8 in the sound source protection box 4 to realize uniform propagation of the sound source; Install the multi-channel microphone at the front end of the sound absorbing piece body 8, the rear end of the artificial sound source 5 and the end of the test channel 7 in the sound source protection box 4 to realize the collection of multiple points of noise; When testing, according to the test requirements, open the artificial sound source 5 at the front end of the sound absorbing piece body 8, adjust the parameters of the fan equipment 2, play white noise and other noise sources, and after the sound source is stable, start the multi-channel microphone to realize the noise value test of the front and rear ends of the sound absorbing piece body 8. The real sound reduction volume of the sound absorbing piece body 8 can be calculated.

[0023] It is to be noted that, in the present text, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more limitations, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements, and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A tool for testing the sound absorption performance of a sound-absorbing sheet, comprising a sound absorber (1), characterized in that, Also include: Fan equipment (2) is arranged in one side of the muffler (1), one side of the fan equipment (2) is communicated with connecting pipe (3), one end of the connecting pipe (3) is communicated with sound source protection box (4), the inside of the sound source protection box (4) is provided with artificial sound source (5), one side of the sound source protection box (4) away from the connecting pipe (3) is communicated with ventilation duct (6), one end of the ventilation duct (6) is communicated with test channel (7), the corner of the test channel (7) is provided with two symmetrical sound attenuation piece bodies (8).

2. The tool for testing sound absorption performance of a sound-absorbing sheet according to claim 1, characterized in that: One side of the sound source protection box (4) is fixed with the sealing plate (9), one side of the sealing plate (9) is fixed with the positioning plate (10), the positioning plate (10) is fixed to the inner wall of the sound source protection box (4), one side of the positioning plate (10) is fixed with the clamping seat (11).

3. The tool for testing sound absorption performance of a sound-absorbing sheet according to claim 1, wherein: One side of the sound source protection box (4) is rotatably connected with the box door (12) through the hinge, one side of the box door (12) is fixed with the handle (13).

4. The tool for testing sound absorption performance of a sound-absorbing sheet according to claim 3, characterized in that: The inner wall of the box door (12) is provided with the lock core (14), one end of the lock core (14) is rotatably connected with the bayonet (15), the bayonet (15) is clamped in the inner wall of the clamping seat (11).

5. The tool for testing sound absorption performance of a sound-absorbing sheet according to claim 1, wherein: The bottom of the muffler (1) is fixed with the support (16), the bottom of the fan equipment (2) is fixed with the supporting leg (17).

6. The tool for testing sound absorption performance of a sound-absorbing sheet according to claim 1, wherein: The sound attenuation piece body (8) is composed of a force frame, an internal sound absorption material and an external protective layer, the test channel (7) is composed of a channel body, a channel top cover plate, a sound source and an array type noise test equipment.

7. The tool for testing sound absorption performance of a sound-absorbing sheet according to claim 1, wherein: The outer protective panel material of the sound attenuation piece body (8) is a perforated plate structure, and the internal sound absorption material is ultrafine centrifugal glass wool.

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