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Anechoic unit with adjustable visible internal structure used for tests

A sound-absorbing unit, a technology for testing, applied in the direction of pipe components, pipes/pipe joints/fittings, mechanical equipment, etc., can solve the problems of troublesome replacement, inability to establish change relations, low efficiency, etc., and achieve simple installation and save test costs Effect

Inactive Publication Date: 2012-06-27
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In terms of research on existing muffler test objects, the representative one is the simple expansion muffler unit designed by Desantes et al [J.M Desantes ,A.J. Torregrosa, A. Broatch, Experiments on flow noise generation in simple exhaust geometries[C]. ACUSTICA united with Acta Acoustica, 2001,87(1):46-55], this test pattern includes inlet pipe, outlet pipe, expansion chamber, one end of the expansion chamber is connected with the inlet pipe, and the other end is connected with the outlet pipe, by changing the wall thickness of the expansion chamber , and the length of different experimental studies, the current improved structure also includes perforated expansion test pattern and inserted tube expansion test sample, the perforated expansion test pattern is provided with a perforated tube or perforated plate in the expansion cavity, inserted The test samples of tubular expansion are provided with insertion tubes in the expansion cavity. These test samples can be used for overall research on the impact of structural parameter changes on airflow regeneration noise and pressure loss, but these test samples cannot establish the characteristics of flow field distribution and air flow. The change relationship between regenerative noise and pressure loss, and these structures are all one-piece structures. Every time a test with different parameters is carried out, the test sample needs to be replaced, which is cumbersome to replace, and the test cost is high and the efficiency is low.

Method used

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  • Anechoic unit with adjustable visible internal structure used for tests
  • Anechoic unit with adjustable visible internal structure used for tests
  • Anechoic unit with adjustable visible internal structure used for tests

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] When using Example 1, the length of the expansion chamber can be changed by moving the front and rear end caps, the expansion ratio can be changed by changing the inlet tube and the outlet tube, and other forms of test patterns can also be realized by changing the structure in the expansion cavity.

[0022] The embodiment 2 of the noise reduction unit used in the test, such as Figure 2-3 As shown, the difference between Embodiment 2 and Embodiment 1 is that, on the basis of the structure of Embodiment 1, Embodiment 2 is provided with a reaming plate 9 perpendicular to the length direction of the expansion chamber 5 in the expansion chamber 5 .

Embodiment 2

[0023] When the embodiment 2 is used, the position of the perforated plate 9 in the expansion chamber 5 can be changed, and the perforated plate can also be replaced to change the perforation rate. Other usage methods are the same as those of the embodiment 1.

[0024] The embodiment 3 of the noise reduction unit used in the test, such as Figure 4 As shown, the difference between embodiment 3 and embodiment 1 is that, on the basis of the structure of embodiment 1, embodiment 3 is provided with a perforated tube 10 perpendicular to the front and rear end caps in the expansion cavity 5. The port is in sealing communication with the inlet pipe, and the rear port connected with the perforated pipe is in sealing communication with the outlet pipe.

Embodiment 3

[0025] Embodiment 3 When in use, the perforated tube can be replaced to change the diameter, perforated shape, perforated arrangement, etc. of the holes on the perforated tube. Other methods of use are the same as in Example 1.

[0026] The front and rear end caps in the above-mentioned embodiments 1, 2, and 3 are all piston-type end caps. In other embodiments, the front end cap can also be a piston-type end cap, and the rear end cap can be a fixed end cap. The end cover is a piston type end cover, and the front end cover is a fixed end cover.

[0027] In the above-mentioned embodiments 1, 2, and 3, the centerlines of the inlet pipe and the outlet pipe are coincident. In other embodiments, the inlet pipe and the outlet pipe can also be offset.

[0028] In other embodiments, an insertion tube may also be arranged in the expansion cavity to form an insertion tube sample.

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Abstract

The invention discloses an anechoic unit used for tests, which comprises an inlet pipe, an outlet pipe and an expansion cavity. The expansion cavity is of a tubular structure; a front end cap is arranged at the front end of the expansion cavity to seal an opening at the front end of the expansion cavity and a rear end cap is arranged at the rear end of the expansion cavity to seal an opening at the rear end of the expansion cavity; the inlet pipe is communicated with the expansion cavity by threading into a communication hole arranged on the front end cap, and the outlet pipe is communicated with the expansion cavity by threading into a communication hole arranged on the rear end cap; at least one of the front end cap and the rear end cap is a piston type end cap; and the wall of the communication hole of the piston type end cap is in slip fit with the wall of the corresponding inlet pipe or outlet pipe. The length of the expansion cavity of the anechoic unit can be adjusted by moving the piston type end cap; after the piston type end cap is dismounted, the integral structure of the anechoic unit does not change; the anechoic unit can form another test sample piece if the internal structure of the expansion cavity is changed; so, when the anechoic unit is used to test different parameters, new sample pieces are unnecessary to replace; thereby the testing cost can be greatly saved.

Description

technical field [0001] The invention belongs to the technical field of mufflers, and mainly relates to a muffler unit for testing. Background technique [0002] In terms of research on existing muffler test objects, the representative one is the simple expansion muffler unit designed by Desantes et al [J.M Desantes ,A.J. Torregrosa, A. Broatch, Experiments on flow noise generation in simple exhaust geometries[C]. ACUSTICA united with Acta Acoustica, 2001,87(1):46-55], this test pattern includes inlet pipe, outlet pipe, expansion chamber, one end of the expansion chamber is connected with the inlet pipe, and the other end is connected with the outlet pipe, by changing the wall thickness of the expansion chamber , and the length of different experimental studies, the current improved structure also includes perforated expansion test pattern and inserted tube expansion test sample, the perforated expansion test pattern is provided with a perforated tube or perforated plate in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/033
Inventor 赵海军常家东王海霞田丽萍李琦
Owner LUOYANG INST OF SCI & TECH