CN201177562Y - Frequency adjustable type air inlet silencing apparatus test device - Google Patents
Frequency adjustable type air inlet silencing apparatus test device Download PDFInfo
- Publication number
- CN201177562Y CN201177562Y CNU2008200979252U CN200820097925U CN201177562Y CN 201177562 Y CN201177562 Y CN 201177562Y CN U2008200979252 U CNU2008200979252 U CN U2008200979252U CN 200820097925 U CN200820097925 U CN 200820097925U CN 201177562 Y CN201177562 Y CN 201177562Y
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- setting nut
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- resonant cavity
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Abstract
The utility model requests to protect a frequency-adjustable single-cavity resonant intake silencer test device, which comprises a resonant cavity, and a short pipe arranged at one end of the resonant cavity and connected with an automotive intake system, wherein the resonant cavity is composed of a cylinder and a piston arranged in the cylinder, and a sealed region formed by the cylinder and the piston serves as the resonant cavity of the silencer; and the piston is connected with a piston axial position adjusting mechanism for conveniently and reliably adjusting the piston to a proper position, thereby adjusting the volume of the resonant cavity and achieving accurate adjustment of the silencing frequency. The intake silencer test device has the advantages of simple structure, easy manufacture, easily-ensured accuracy, convenient resonant frequency adjustment, and high operability for controlling automotive intake noise, and can greatly reduce the workload for the trial-manufacture of a test sample, thereby reducing the noise control period and the control cost, as well as improving the work efficiency.
Description
Technical field
The utility model relates to car engine air admittance noise control experimental technique field, particularly a kind of car engine air admittance noise control test unit.
Background technology
The car engine air admittance noise is one of automobile overriding noise source, and it is bigger with a certain single-frequency noise contribution, common noise-reduction method is to make one or more single-cavity resonance type sound suppressors at this single-frequency noise, reduces the induction noise of automobile by the noise that reduces main frequency.Resonance type muffler device basic structure as shown in Figure 1, be that a kind of linking by pipeline tapping and Helmholtz acoustic resonance device forms noise elimination structure, its noise-cancelling theory is to utilize Helmholtz acoustic resonance device sound vibrating system, when the resonant frequency of acoustic resonance device is required frequency of noise elimination, reaches the effect of preferably eliminating the noise.The resonant frequency of acoustic resonance device is
In the formula: f
0Be resonant frequency; L
0Be resonator short tube length, in practicality, generally get effective length and calculate that for the circular section short tube, desirable effective length is L
c+ π d
c/ 4; d
cBe diameter of section, A
cBe the short tube sectional area; V is the resonant cavity volume; L
cLength for neck.
From following formula as can be known, can determine resonant frequency by regulating resonant cavity volume, short tube length and short tube sectional area, the resonant frequency size is inversely proportional to resonator short tube length and resonant cavity volume, is directly proportional with the short tube sectional area.In induction noise control process of the test, usual way is by making resonance type muffler device exemplar certain single-frequency noise to be carried out major control, but make by hand or the exemplar of rapid shaping is difficult to the requirement of all promising policy frequency of noise elimination, need repetition test test and exemplar to make, increased cost of manufacture and noise control cycle like this.If can design the resonance type muffler device of frequency adjustable, and reuse and to reduce experimentation cost greatly, shorten test period.
Summary of the invention
The purpose of this utility model is in the induction noise control procedure, the resonance type muffler device of trial-production is difficult to the requirement of all promising policy frequency of noise elimination, a kind of frequency-adjustable intake silencer tester is provided, resonance frequency can be regulated, reach good noise reduction, reduce the trial-production of exemplar, both can reduce the noise control cycle, also reduce and control cost.
The technical solution adopted in the utility model is as follows:
A kind of frequency-adjustable intake silencer tester, it has a resonant cavity, resonant cavity one end has the short tube that links to each other with the automotive air intake system, and described resonant cavity is made of cylindrical shell and the piston that is arranged in the cylindrical shell, and the closed region that is formed by cylindrical shell and piston is as the resonant cavity of sound suppressor; Piston is connected to position adjusting mechanism with the axis of the piston, can easily and reliably piston be adjusted to suitable position, with the volume of adjustment resonant cavity, thus the accurate adjusting of realization frequency of noise elimination,
Described the axis of the piston comprises adjusting screw(rod), lining and setting nut assembly to position adjusting mechanism; The setting nut assembly is axially fixed on the cover plate of the resonant cavity other end, and the adjusting screw(rod) front end connects piston, and the setting nut assembly is passed in the adjusting screw(rod) rear end, and assembles with its threaded engagement.
Described setting nut group is made up of embossing regulating block, embossing regulating block clamp nut, setting nut, setting nut is assemblied in the cover central hole by lining, the inner of setting nut is pressed in the inner face of cover central hole by the cylindrical boss, the embossing regulating block is nested in the setting nut outer end, the inner face of embossing regulating block is pressed in the outer face of cover central hole, embossing regulating block clamp nut is assemblied on the setting nut, the embossing regulating block is pressed on the outer face of setting nut.Adjusting screw(rod) passes setting nut, with its threaded engagement assembling.
This resonance frequency adjustable single-cavity resonance type intake silencer tester has the adjustable effect of resonance frequency, simple in structure, manufacturing handling ease, and precision is easy to guarantee that resonance frequency is easy to adjust.This sound suppressor is used for automotive air intake Noise Control strong operability, has greatly reduced the development work of exemplar, so both can reduce the noise control cycle, also can reduce and control cost, and increases work efficiency.
Description of drawings
Fig. 1: resonance type muffler device noise-cancelling theory synoptic diagram
Fig. 2: the structural representation of this intake silencer tester
The A of Fig. 3: Fig. 2 is to view.
Wherein, 1-cylindrical shell, 2-set nut, the 3-trip bolt, 4-left clapboard, 5-sealing gasket, the 6-right clapboard, 7-adjusting screw(rod), 8-cover plate, 9-cover plate fastening bolt, 10-lining, 11-embossing regulating block, 12-embossing regulating block clamp nut, 13-setting nut, 14-pad, the 15-connecting pipe, 16-air equalizer opening, 17-scale.
Embodiment
Referring to Fig. 2 and Fig. 3, the resonant cavity of this intake silencer tester is by cylindrical shell 1 and is arranged at piston in the cylindrical shell and forms the closed region and constitute that piston is connected to position adjusting mechanism with the axis of the piston, with the position of adjustment piston in cylindrical shell.Wherein:
One end of cylindrical shell 1 has the connecting pipe 15 that links to each other with the automotive air intake system, and other end edge is provided with the boss of six band screws, and by cover plate fastening bolt 9 securing cover plates 8, cover plate 8 is used to install the axis of the piston to position adjusting mechanism.
Piston by about two dividing plates 4,6 and therebetween pad 5 sealing together constitute, fastening by trip bolt 3, piston and cylindrical shell 1 inwall form wringing fit, its axial location is regulated to position adjusting mechanism by the axis of the piston.
The setting nut assembly that the axis of the piston is made up of adjusting screw(rod) 7, lining 10 and embossing regulating block 11, embossing regulating block clamp nut 12, setting nut 13 to position adjusting mechanism constitutes.Adjusting screw(rod) 13 front ends are connected with piston with pad 14 by set nut 2.Assembling setting nut 13 on the adjusting screw(rod) 7, setting nut 13 is assemblied in the cover central hole of cylindrical shell 1 other end by lining 10, the inner of setting nut 13 is pressed in the inner face of cover central hole by the cylindrical boss, embossing regulating block 11 is nested in setting nut 13 outer ends, the inner face of embossing regulating block 11 is pressed in the outer face of cover central hole, embossing regulating block clamp nut 12 is assemblied on the setting nut 13, embossing regulating block 11 is pressed on the outer face of setting nut 13, make embossing regulating block 11 thus, embossing regulating block clamp nut 12, the setting nut assembly that setting nut 13 is formed is with respect to cover plate 8 axial restraints, can only rotate and to move axially, because adjusting part is with respect to the cover plate axial restraint, during the rotation adjusting part, just can regulate the axial location of adjusting screw(rod), thus the axial location of regulating piston.Adjusting screw(rod) 7 is marked with scale 17, in order to indicate the frequency of sound suppressor.Lining 10 is a copper sheathing, is a tight fit on the cover plate 8, is used for lubricated and abrasionproof.Whole governor motion is fixed on the cylindrical shell 1 by cover plate 8, has the air equalizer opening 16 that is used for air pressure balance on the cover plate 8.
Claims (7)
1, a kind of frequency-adjustable intake silencer tester, it has a resonant cavity, and resonant cavity one end has the short tube that links to each other with the automotive air intake system; It is characterized in that: described resonant cavity is made of cylindrical shell and the piston that is arranged in the cylindrical shell, and piston is connected to position adjusting mechanism with the axis of the piston.
2, frequency-adjustable intake silencer tester according to claim 1 is characterized in that: described the axis of the piston comprises adjusting screw(rod), lining and setting nut assembly to position adjusting mechanism; The setting nut assembly is axially fixed on the cover plate of the resonant cavity other end, and the adjusting screw(rod) front end connects piston, and the setting nut assembly is passed in the rear end, and assembles with its threaded engagement.
3, frequency-adjustable intake silencer tester according to claim 1, it is characterized in that: described setting nut group is by the embossing regulating block, embossing regulating block clamp nut, setting nut is formed, setting nut is assemblied in the cover central hole by lining, the inner of setting nut is pressed in the inner face of cover central hole by the cylindrical boss, the embossing regulating block is nested in the setting nut outer end, the inner face of embossing regulating block is pressed in the outer face of cover central hole, embossing regulating block clamp nut is assemblied on the setting nut, the embossing regulating block is pressed on the outer face of setting nut, adjusting screw(rod) passes setting nut, with its threaded engagement assembling.
4, according to claim 1,2 or 3 described frequency-adjustable intake silencer testers, it is characterized in that: described piston by about two dividing plates and the pad sealing together that is clipped in the middle constitute, they connect as one by trip bolt.
5, according to claim 1,2 or 3 described frequency-adjustable intake silencer testers, it is characterized in that: described adjusting screw(rod) is connected and fixed in piston by set nut.
6, according to claim 1,2 or 3 described frequency-adjustable intake silencer testers, it is characterized in that: described adjusting screw(rod) is marked with scale.
7, according to claim 1,2 or 3 described frequency-adjustable intake silencer testers, it is characterized in that: described lid version is provided with air equalizer opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200979252U CN201177562Y (en) | 2008-03-31 | 2008-03-31 | Frequency adjustable type air inlet silencing apparatus test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200979252U CN201177562Y (en) | 2008-03-31 | 2008-03-31 | Frequency adjustable type air inlet silencing apparatus test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201177562Y true CN201177562Y (en) | 2009-01-07 |
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ID=40217583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200979252U Expired - Fee Related CN201177562Y (en) | 2008-03-31 | 2008-03-31 | Frequency adjustable type air inlet silencing apparatus test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201177562Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832328A (en) * | 2014-12-19 | 2015-08-12 | 北汽福田汽车股份有限公司 | Adjustable resonator and application method therefor |
| CN106092592A (en) * | 2016-08-03 | 2016-11-09 | 安阳全丰航空植保科技股份有限公司 | Agricultural plant protection helicopter engine gas extraction system optimization Test device |
| CN108323188A (en) * | 2017-07-07 | 2018-07-24 | 京瓷办公信息***株式会社 | Developer container and the image forming apparatus for having the developer container |
| CN111749754A (en) * | 2019-03-27 | 2020-10-09 | 广州汽车集团股份有限公司 | Sound quality adjusting device and method for exhaust system |
-
2008
- 2008-03-31 CN CNU2008200979252U patent/CN201177562Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832328A (en) * | 2014-12-19 | 2015-08-12 | 北汽福田汽车股份有限公司 | Adjustable resonator and application method therefor |
| CN106092592A (en) * | 2016-08-03 | 2016-11-09 | 安阳全丰航空植保科技股份有限公司 | Agricultural plant protection helicopter engine gas extraction system optimization Test device |
| CN108323188A (en) * | 2017-07-07 | 2018-07-24 | 京瓷办公信息***株式会社 | Developer container and the image forming apparatus for having the developer container |
| CN108323188B (en) * | 2017-07-07 | 2021-04-09 | 京瓷办公信息***株式会社 | Developer container and image forming apparatus including the same |
| CN111749754A (en) * | 2019-03-27 | 2020-10-09 | 广州汽车集团股份有限公司 | Sound quality adjusting device and method for exhaust system |
| CN111749754B (en) * | 2019-03-27 | 2023-08-15 | 广州汽车集团股份有限公司 | Exhaust system sound quality adjusting device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090107 Termination date: 20120331 |