CN203717275U - Noise elimination element - Google Patents
Noise elimination element Download PDFInfo
- Publication number
- CN203717275U CN203717275U CN201320732552.2U CN201320732552U CN203717275U CN 203717275 U CN203717275 U CN 203717275U CN 201320732552 U CN201320732552 U CN 201320732552U CN 203717275 U CN203717275 U CN 203717275U
- Authority
- CN
- China
- Prior art keywords
- quarter
- wave long
- long tube
- expansion cavity
- wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000008030 elimination Effects 0.000 title abstract description 13
- 238000003379 elimination reaction Methods 0.000 title abstract description 13
- 230000003584 silencer Effects 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 abstract description 10
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 230000005284 excitation Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 230000030279 gene silencing Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model discloses a noise elimination element which comprises an expansion cavity provided with an air inlet pipe and an air outlet pipe. The noise elimination element is characterized in that the expansion cavity is cylindrical, an upper end cover and a lower end cover for closing the end parts of the expansion cavity are respectively arranged at the two ends of the expansion cavity, the upper end cover is provided with the air inlet pipe, the lower end cover is provided with the air outlet pipe, and the expansion cavity is provided with a quarter-wave pipe communicated with the expansion cavity. The expansion cavity and the quarter-wave pipe act together, so that the inlet pulse of an air compressor is stabilized, the excitation of the air inlet pulse of the air compressor on an air intake system of a whole car is effectively weakened, the functions of broadband silencing and voltage stabilizing of the expansion cavities are effectively given a play, and the coupling resonance of a system cavity is inhibited. Besides, the defects of poor frequency selection capability, and demand of large volume for high noise elimination amplitude and the like are avoided.
Description
Technical field
The utility model relates to a kind of silencer element, particularly relates to a kind of intake noise reduction element used for air compressor.
Background technique
Passenger vehicle and truck adopt air compressor as car load air-pressure brake source of the gas conventionally at present, consider the reliability of air compressor and the convenience of layout, conventionally air compressor air intake system and diesel engine are shared to a set of gas handling system, also buried though saved space the hidden danger that produces regenerated noise.Air compressor is as the main source of the gas of car load air-pressure brake, it is one of car load vitals, when compressor operation, the bouncing of intake and exhaust valve block, gear engagement all can produce noise, especially attach most importance to suction pulsation noise, even more serious when particularly air compressor air intake pulse and diesel engine air inlet system produce and be coupled.Both having there is narrow audio-frequency noise in this noise, also has broadband noise composition, particularly particularly serious in the time of idling, can make car load gas handling system produce serious " too " abnormal sound.Again it is longer to mate the car load gas handling system cycle, tends to because many reasons cannot be implemented, and installs resonance voltage stabilizing silencer element simple possible additional in air compressor import, by most producers are adopted, as benz, MAN, Scania etc.
Due to air compressor performance characteristic and the restriction of car load package space, require air compressor air intake resonant element compact structure and easily install, acoustical behavior is high, have band selective, back pressure loss is little and have voltage stabilizing function etc., as expansion cavity (thering is the resonant cavity of a constant volume), quarter-wave long tube (be length be frequency of noise elimination corresponding wavelength length 1/4th, the rigid conduit of endcapped), the resonant element such as last of the twelve Earthly Branches nurse hertz resonant cavity is the most conventional.
Expansion cavity is mainly made up of inlet/outlet pipe and intermediate expansion chamber, and sound wave enters expansion chamber by import, and the difference of sectional area causes that acoustic impedance changes, and a part of incoming wave will be reflected back toward original sound source, suppresses the outside propagation of sound wave, and plays noise elimination effect; Simultaneously large volume reduces air-flow velocity, weakens gas, thereby plays pressure stabilization function.The volume of expansion cavity directly affects its voltage regulation performance, acoustic attenuation performance, frequency of noise elimination etc.Expansion cavity simplicity of design, anechoic frequency bandwidth, voltage stabilizing function are strong, but band selective is poor, volume is large, back pressure loss is high.
Quarter-wave long tube is the rigid conduit of an end opening the other end sealing, sound wave emits from pipe head, propagate into tail end, because making its acoustic impedance, endcapped is tending towards infinite, sound wave is all rebounded, propagate to entry end, some frequency range sound wave forms standing wave node at entry end, and to make entry position acoustic pressure be 0 again, reaches the noise elimination function of this frequency range with this.The features such as quarter wavelength pipe has simplicity of design, little, the easy layout of volume, back pressure loss is little, frequency band selection ability is strong, but also there is the shortcomings such as voltage stabilizing function is weak, frequency band acoustical absorptivity is poor.
Last of the twelve Earthly Branches nurse hertz resonant cavity and quarter-wave long tube are quite more similar to dynamic shock absorber.Be made up of cavity and the acoustic waveguide tube with a constant volume, acoustic waveguide air in tube is similar to piston, has certain acoustical mass; Closed cavity is similar to pneumatic spring, have certain acoustic compliance, the two forms a resonator system, in the time that frequency of sound wave is consistent with this system frequency, under the effect of sound wave, acoustic waveguide air in tube produces vibration, and frictional damping makes a part of acoustic energy be converted to thermal dissipation.Its frequency of noise elimination, noise elimination amplitude etc. and last of the twelve Earthly Branches nurse hertz resonant cavity volume, acoustic waveguide tube sectional area, acoustic waveguide tube length are directly related, though there is simplicity of design, back pressure loss is little, band selective is strong, also have the shortcomings such as volume is large, voltage stabilizing function is weak, frequency band acoustical absorptivity is poor.
The single resonance structure of many employings, often attends to one thing and lose sight of another at present, cannot well take the acoustical behavior, voltage stabilizing function and the low back pressure loss that in installing space situation, have ensured into account.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind ofly can effectively bring into play that expansion cavity wideband is eliminated the noise, the advantage of voltage stabilizing ability, the silencer element of the shortcoming such as simultaneously evade that the large volume of noise elimination amplitude needs that expansion cavity frequency selective power is poor, high is realized.
For solving the problems of the technologies described above, the utility model comprises the expansion cavity with suction tude and steam outlet pipe, it is characterized in that described expansion cavity is cylindric, the two ends of expansion cavity are respectively equipped with the upper end cap of its end-enclosed and lower end cap, described upper end cap is provided with suction tude, and described lower end cap is provided with steam outlet pipe; Described expansion cavity is provided with the quarter-wave long tube being communicated with it.
Described quarter-wave long tube installs around the outer surface at expansion cavity in the shape of a spiral.
The opening end of described quarter-wave long tube is connected in suction tude.
In described suction tude, be communicated with the first quarter-wave long tube, on steam outlet pipe, be communicated with the second quarter-wave long tube, the closed end connection of two quarter-wave long tubes is connected as a single entity two quarter-wave long tubes, and length and the wavelength length of described the first quarter-wave long tube and the second quarter-wave long tube adapt.
The sidepiece of described expansion cavity is provided with perforate, in perforate, be connected with tee union, other two joints of tee union are connected with respectively the first quarter-wave long tube and the second quarter-wave long tube, and length and the wavelength length of described the first quarter-wave long tube and the second quarter-wave long tube adapt.
Described upper end cap is or/and lower end cap is provided with the clip for fixing quarter-wave long tube.
Adopt after said structure, be provided with the structure of tee union as example describes taking expansion cavity, when air compressor brings into operation, gas and sound wave enter expansion cavity simultaneously, and enter the first quarter-wave long tube and the second quarter-wave long tube through tee union; Sound wave is reflected back into expansion cavity tapping by the first quarter-wave long tube, the second quarter wavelength duct occlusion end, because single spin-echo is cancelled out each other with the sound wave of same frequency in expansion cavity, eliminates corresponding narrow audio-frequency noise, and expansion cavity is eliminated all the other frequency range noises.Expansion cavity and the first quarter-wave long tube, the second quarter-wave long tube acting in conjunction, stablize air compressor air intake pulsation, effectively weaken air compressor air intake pulsation to the excitation of car load gas handling system, effectively bring into play the noise elimination of expansion cavity wideband, voltage stabilizing ability, suppress the coupling resonance of system cavity.Evade the large volume of noise elimination amplitude needs that expansion cavity frequency selective power is poor, high simultaneously and the shortcoming such as realize.
Brief description of the drawings
Below in conjunction with the drawings and the specific embodiments, the utility model is described in further detail:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is cross-sectional schematic of the present utility model;
Fig. 3 is assembling schematic diagram of the present utility model;
Fig. 4 is the stereogram of assembling schematic diagram of the present utility model;
Fig. 5 is the structural representation of expansion cavity;
Fig. 6 is the schematic diagram that quarter-wave long tube is connected with end cap.
Embodiment
As shown in Figures 1 to 6, the embodiment that the utility model is provided with tee union with expansion cavity describes, silencer element comprises the expansion cavity 4 with suction tude 1 and steam outlet pipe 5, when use, suction tude 1 is connected with air-strainer, steam outlet pipe 5 is connected with air compressor air intake mouth, expansion cavity 4 is cylindric, the two ends of expansion cavity 4 are respectively equipped with the upper end cap of its end-enclosed 6 and lower end cap 7, upper end cap 6 is provided with the suction tude 1 being communicated with expansion cavity 4, and lower end cap 7 is provided with the steam outlet pipe 5 being communicated with expansion cavity 4.The sidepiece of expansion cavity 4 is provided with perforate 9, in perforate 9, be connected with tee union 8, other two joints of tee union 8 are connected with respectively the first quarter-wave long tube 2 and the second quarter-wave long tube 3, adopt tee union 8 that expansion cavity 4 is connected with ripple 1/4th long tubes, be convenient to the replacing of quarter-wave long tube.Length and the wavelength length of the first quarter-wave long tube 2 and the second quarter-wave long tube 3 adapt, the length of the first quarter-wave long tube 2 and the second quarter-wave long tube 3 is selected according to the frequency band of expansion cavity 4 interior sound waves respectively, and on expansion cavity 4, setting is adjusted according to the length of two quarter-wave long tubes in the position of perforate 9.The first quarter-wave long tube 2 and the second quarter-wave long tube 3 all install around the outer surface at expansion cavity 4 in the shape of a spiral, the external diameter of the spiral internal diameter of quarter-wave long tube and expansion cavity 4 adapts, make wavelength pipe can well be sleeved on the outer surface of expansion cavity 4, and this kind of structure is easy for installation, compact structure, saving space.Corresponding the first quarter-wave long tube 2 of upper end cap 6 is provided with clip 11, corresponding the second quarter-wave long tube 3 of lower end cap 7 is also provided with clip 11, the Flat belt that clip 11 in the present embodiment is rigidity, Flat belt wraps the end of quarter-wave long tube, then two free ends of Flat belt are separately fixed on upper and lower end cap (6,7) by bolt 10.Clip 11 also can use other pipe fixing devices such as the clip adapting with quarter-wave long tube external diameter.
The silencer element of this kind of structure has the following advantages: quarter-wave long tube can be used for eliminating assigned frequency noise, makes up expansion cavity 4 frequency selectivities; Narrow frequency silencer element quarter-wave long tube and the effective combination of wideband silencer element expansion cavity 4, ensure acoustical behavior; Quarter-wave long tube and expansion cavity 4 combinations, ensure that acoustical behavior has reduced expansion cavity 4 volumes simultaneously greatly; Quarter-wave long tube and columned expansion cavity 4 combining structure compactnesses that helical arranges; Two quarter-wave long tubes have improved resonant element frequency selectivity energy; Quarter-wave long tube and expansion cavity 4 be in conjunction with ensureing the required volume of air inlet element voltage stabilizing, and the acoustical behavior holding such as greatly improve.
The utility model can also only arrange a quarter-wave long tube and install around in the shape of a spiral the outer surface at expansion cavity 4, and the opening end of quarter-wave long tube is connected in suction tude 1, and the length of quarter-wave long tube also arranges according to the wavelength of sound wave.The clip that is provided for fixing quarter-wave long tube on upper end cap 6, prevents that quarter wavelength tube vibration from affecting its end part seal and acoustic attenuation performance.
Structure of the present utility model also can be: in suction tude 1, be communicated with the first quarter-wave long tube, on steam outlet pipe 5, be communicated with the second quarter-wave long tube, the closed end connection of two wavelength pipes is connected as a single entity two wavelength pipes, two quarter-wave long tubes of this kind of structure can be divided into two-part and be made by plugging plate is set at a whole wavelength pipe middle part, and length and the wavelength length of the first quarter-wave long tube and the second quarter-wave long tube adapt.Two quarter-wave long tubes install around the outer surface at expansion cavity 4 in the shape of a spiral, are respectively equipped with the clip for fixing quarter-wave long tube on upper end cap 6 and lower end cap 7.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model.Previous embodiment has been described in detail the utility model, and for a person skilled in the art, its technological scheme that still can record aforementioned each embodiment is modified, or part technical characteristics is wherein equal to replacement.In every case within inventive concept scope of the present utility model, any amendment of making, be equal to replacement, improvement etc., within being all included in protection domain of the present utility model.
Claims (2)
1. a silencer element, comprise the expansion cavity (4) of there is suction tude (1) and steam outlet pipe (5), described expansion cavity (4) is provided with the quarter-wave long tube being communicated with it, it is characterized in that described expansion cavity (4) is cylindric, the two ends of expansion cavity (4) are respectively equipped with the upper end cap of its end-enclosed (6) and lower end cap (7), described upper end cap (6) is provided with suction tude (1), described lower end cap (7) is provided with steam outlet pipe (5), and described quarter-wave long tube installs around the outer surface in expansion cavity (4) in the shape of a spiral; In the time that described quarter-wave long tube is one, the opening end of described quarter-wave long tube is connected in suction tude; In the time that described quarter-wave long tube is two, length and the wavelength length of the first quarter-wave long tube and the second quarter-wave long tube adapt, the first quarter-wave long tube is communicated with suction tude, the second quarter-wave long tube is communicated with steam outlet pipe, and the closed end connection of two quarter-wave long tubes is connected as a single entity two quarter-wave long tubes; Or described quarter-wave long tube is while being two, length and the wavelength length of the first quarter-wave long tube and the second quarter-wave long tube adapt, sidepiece at expansion cavity is provided with perforate, in described perforate, be connected with tee union, other two joints of tee union are connected with the first quarter-wave long tube and the second quarter-wave long tube respectively.
2. silencer element according to claim 1, is characterized in that described upper end cap (6) or/and lower end cap (7) is provided with the clip (11) for fixing quarter-wave long tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320732552.2U CN203717275U (en) | 2013-11-20 | 2013-11-20 | Noise elimination element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320732552.2U CN203717275U (en) | 2013-11-20 | 2013-11-20 | Noise elimination element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203717275U true CN203717275U (en) | 2014-07-16 |
Family
ID=51156435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320732552.2U Expired - Lifetime CN203717275U (en) | 2013-11-20 | 2013-11-20 | Noise elimination element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203717275U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104176135A (en) * | 2014-08-22 | 2014-12-03 | 三一矿机有限公司 | Damping and noise reduction structure of cab and mining dump truck |
| CN106382432A (en) * | 2016-11-22 | 2017-02-08 | 苏州大学 | Helmholtz resonant silencing unit based on maze structure and resonant silencer |
-
2013
- 2013-11-20 CN CN201320732552.2U patent/CN203717275U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104176135A (en) * | 2014-08-22 | 2014-12-03 | 三一矿机有限公司 | Damping and noise reduction structure of cab and mining dump truck |
| CN106382432A (en) * | 2016-11-22 | 2017-02-08 | 苏州大学 | Helmholtz resonant silencing unit based on maze structure and resonant silencer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101211301B1 (en) | Resonator | |
| US11255238B2 (en) | Muffler comprising a Helmholtz resonator and a vehicle comprising such a muffler | |
| ATE458141T1 (en) | Sound attenuation device for the intake line of an internal combustion engine and intake line including same | |
| CN104234890A (en) | High-frequency muffler used on automobile intercooler intake pipe | |
| CN204163804U (en) | Automobile exhaust pipe baffler | |
| CN106121881A (en) | High frequency acoustic filter in vehicle intercooler air inlet pipe | |
| CN107923349A (en) | Vehicle resonator | |
| CN203717275U (en) | Noise elimination element | |
| CN201865727U (en) | Silencing device for reducing noise of internal combustion engine | |
| CN105927594A (en) | Muffler of turbocharger | |
| KR200457936Y1 (en) | Muffler for Vehicle | |
| CN204783176U (en) | Light truck muffler | |
| CN203516001U (en) | Air suction pressure-stabilizing sound-reducing element for air compressor | |
| CN209195512U (en) | A kind of automobile exhaust system rosonator | |
| CN205841329U (en) | The acoustic filter of turbocharger | |
| CN205841330U (en) | Turbocharger silencer | |
| CN210033671U (en) | Air filter for automobile | |
| CN204163808U (en) | Backpressure muffler falls in multi-cavity combined type | |
| CN202082018U (en) | Air inlet muffling device for automobile | |
| CN203035309U (en) | Gasoline engine muffler | |
| KR20110136391A (en) | Muffler for vehicle | |
| CN201778859U (en) | Muffler for light vehicle | |
| CN209704679U (en) | A kind of same end face disengaging gas internal combustion engine exhaust silencer | |
| CN105927315B (en) | A kind of impedance composite muffler | |
| CN104594993A (en) | Silencer for internal combustion engine of light truck |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140716 |
|
| CX01 | Expiry of patent term |