CN2032256U - Diesel engine intake silencer - Google Patents
Diesel engine intake silencer Download PDFInfo
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- CN2032256U CN2032256U CN 88203144 CN88203144U CN2032256U CN 2032256 U CN2032256 U CN 2032256U CN 88203144 CN88203144 CN 88203144 CN 88203144 U CN88203144 U CN 88203144U CN 2032256 U CN2032256 U CN 2032256U
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Abstract
The utility model relates to a diesel engine intake silencer. The design and the installation of the silencer of an air intake pipe in the air supply system are improved, and the combustion noise of the diesel engine propagated by the air intake pipe is reduced according to the noise spectrum characteristic of the air intake pipe of the high-speed diesel engine. The diesel engine intake silencer makes the working noise of the diesel engine be reduced effectively as well as keeps the working performance of the diesel engine be invariant. The air intake pipe of the silencer passes through an expanding cavity limited by a casing body. The intake end of the air intake pipe is mutually connected with the exit end. Besides, the middle section of the air intake pipe in the expanding cavity is provided with a plurality of small holes, which forms the discontinuous structure in the sound propagation. The silencer can be connected in series in the air intake duct or coupled in an air cleaner. The utility model has the advantages of convenient installation and small size.
Description
The present invention relates to the silencer of internal-combustion engine, relate more specifically to the suction tude silencer of high speed four-journey diesel engine.
Diesel engine is a kind of dynamic power machine of very noisy.To the improvement design that exhaust silencer is usually all paid attention in measure of subduing of diesel engine work noise, but the often improvement of exhaust silencer does not but have tangible noise elimination effect even invalid completely to diesel engine work noise.This mainly is a cause of having ignored the admission line noise.For the admission line noise, usually all think a secondary cause in the diesel engine work noise.Thereby in the design of diesel engine air supply system, comprise the design of air-strainer, fail to consider well the requirement of its acoustic attenuation performance aspect.In fact, in diesel engine was always worked noise, the noise that admission line is propagated was another main noise source that is only second to exhaust sound.After exhaust sound obtained effective attenuation, the suction tude noise just rose to the size that leading position is being dominated diesel engine work noise.Therefore in this case, only on exhaust silencer, do to improve design, just obviously reach the purpose that diesel engine work noise is effectively reduced, no matter because the acoustic attenuation performance of exhaust silencer have how good, always of no avail to suction tude noise " beyond one's ability to help ".
The origin cause of formation and the exhaust sound of suction tude noise are similar, are mainly caused by the noise in following two processes.
One. the noise that produces in the breathing process comprises:
1. the pneumatic noise that produces when high velocity air flows into cylinder;
2. during IO Intake Valve Opens, pressure waste gas produces the moment reverse flow and forms pressure pulse, evokes the noise that the air in the intake duct is produced by the vibration of the gas column natural frequency of vibration in the cylinder;
3. the same pressure pulse that produces during IC Intake Valve Closes forms the vibration noise of gas column;
4. during IC Intake Valve Closes, valve of outwards propagating through admission line and the knock between the valve seat.
Two. IC Intake Valve Closes comprises to the noise of open period generation next time:
1. in the power stroke, the cylinder combustion decrepitate is sent out noise, and it passes to air in the intake duct through the cylinder head radiation, causes in the pipe gas column judder and this burning outburst noise is outwards propagated;
2. in the exhaust stroke, the exhaust sound that strong cylinder pressure pulse produces, the intake duct air is passed in its thin-walled radiation through between the inlet and outlet road, causes in the pipe gas column vibration noise equally and outwards propagates;
3. behind the IC Intake Valve Closes, suction tude becomes the resonant cavity that the end sealing the other end is opened.The resonance of small amplitude wave all will take place in the frequency that all pipe ranges equal 1/4 wavelength odd-multiple, produce the bigger resonance sound of intensity.
The noise that above-mentioned two processes produce especially is Main Ingredients and Appearance with the latter.Therefore the frequency characteristic of suction tude noise is similar with the frequency characteristic of exhaust sound, is to be that the harmonic series that burning breaks out frequency is formed by fundamental frequency, has the higher characteristics of Low Medium Frequency sound pressure level.This is to make the suction tude noise become the substantial factor of the main noise source that is only second to exhaust sound.
The objective of the invention is to,, improve the design and installation of silencing apparatus, in the design of diesel engine air supply system, be coupled into the suction tude silencing apparatus according to the spectral characteristic of high-speed diesel engine suction tude noise.Guaranteeing under the constant prerequisite of diesel engine work performance, reducing the Combustion Noise of Diesel Engine that admission line is propagated, thereby diesel engine work noise is effectively reduced.
The objective of the invention is to realize by following structural design, it is: a kind of diesel engine intake muffler pipe that includes the expansion cavity housing of suction tude and restriceted envelope volume, it is characterized in that, a. suction tude is passed the expansion cavity space that is limited by above-mentioned housing, and the entrance point A of this suction tude and outlet end B are that one is communicated with; B. above-mentioned suction tude is positioned at one section many aperture that are installed with UNICOM's suction tude air flue and expansion cavity in centre of the part of described expansion cavity.
The design of above-mentioned suction tude silencing apparatus, be according to the suction tude noise spectrum feature under the engine power rating state, and on the basis of the requirement aspect the requirement of satisfying the engine operation aspect of performance and the noise elimination of suction tude noise, determine the acoustic wave filter structure parameter.These parameters comprise: divergence ratio and the internal diameter of expansion chamber, the length of silencing apparatus expansion chamber and all parameters of described perforated portion of the suction tude sectional area that is complementary with the diesel engine intake road, maximum sound deadening capacity, silencing apparatus.
The present invention has adopted the suction tude silencing apparatus that improves design according to the frequency characteristic of high-speed diesel engine suction tude noise, has received good noise elimination effect, makes the operational noise of diesel engine obtain effectively reducing.
Need be pointed out that device of the present invention needs to be used with good exhaust silencer, that is no longer be under the situation of diesel engine main noise source, use this device just can embody good noise elimination effect at the exhaust sound after the exhaust silencer decay.
In addition, this device can also be complementary with the structural type and the limited installing space of air supply system, and it is constant but also be coupled on the diesel engine preferably not only to have kept diesel engine work performance.
Therefore the present invention is a high-speed diesel engine, for example agricultural equipment Diesel engine, tractor, engineering machinery, engineering vehicle and inland navigation craft provide a kind of and can make the effective reduction of diesel engine noise can keep the constant and less suction tude silencer easy for installation of structural volume of diesel engine work performance again with diesel engine etc.
Below in conjunction with drawings and Examples, the present invention is described in detail.
Fig. 1 is the structural representation of silencer of the present invention;
Fig. 2 is a kind of frequency characteristic figure of agricultural equipment Diesel engine suction tude noise;
Fig. 3 is the acoustic characteristics figure of Fig. 2 diesel engine installation diagram 1 intake silencer;
Fig. 4 is the structural representation that Fig. 1 silencer and dry-type air cleaner are integrated;
Fig. 5 is the another kind of structural representation that Fig. 1 silencer and dry-type air cleaner are integrated;
Fig. 6 is the structural representation that Fig. 1 silencer and wet-type cleaner are integrated;
Fig. 7 is the structural representation that Fig. 1 silencer is connected in series with dry-type air cleaner;
Fig. 8 is the another kind of structural representation that Fig. 1 silencer is connected in series with dry-type air cleaner;
Fig. 9 is the structural representation that Fig. 1 silencer is connected in series with wet-type cleaner;
Figure 10 is the another kind of structural representation that Fig. 1 silencer is connected in series with wet-type cleaner.
With reference to Fig. 1, this silencer is an expansion chamber resistant silencing apparatus.Its suction tude 1 sectional area S
1Be complementary with the diesel engine intake road.Its housing sidewall 2 and two end cap 3,4 define an airtight expansion chamber space.The sectional area of expansion chamber inner chamber 5 is S
2Above-mentioned suction tude 1 is inserted through expansion cavity 5 from end cap 3,4 central authorities.The centre that suction tude 1 is positioned at part within the expansion cavity 5 is installed with many apertures 6 for one section.Suction tude 1 overlaps substantially with the center line of expansion cavity 5.
The logical atmosphere of entrance point A end of suction tude 1, another outlet end B end can be connected with the air-strainer suction port.Like this, when engine operation, on the one hand, air enters air-strainer, enters cylinder through air-strainer again through suction tude A end; On the other hand, after burning outburst noise in the cylinder reaches intake duct, enter this silencer through ducted air borne by the outlet end B of suction tude 1 end, 6 places enter expansion cavity 5 at above-mentioned aperture, form the discontinuous construction in the propagation of sound, cause that sound reflection reaches the purpose of noise elimination thereby the acoustic impedance of pipeline is changed.
See figures.1.and.2, the parameter of structure design of silencer shown in Figure 1 takes following method to determine.
Since diesel engine maximum combustion noise generally all occur in one of the rated power state among a small circle in, thereby the design of suction tude silencing apparatus must be characterized as foundation with the suction tude noise spectrum of rated power state.Its specific practice is:
1. the mensuration of suction tude noise frequency characteristic
Obtained effective attenuation at exhaust sound, the suction tude noise is under the prerequisite of diesel engine main noise source, make diesel engine runs steadily under full load rated power rotating speed, measure the linear sound pressure level and the A weighted sound pressure level third-octave frequency spectrum of suction tude noise separately.The frequency characteristic of 495A type agricultural equipment Diesel engine suction tude noise as shown in Figure 2.Among Fig. 2: curve 1 is an A weighted curve, and overall sound pressure level is 105.8dB(A); Curve 2 is linearity curves, and overall sound pressure level is 113.2dB(L) (measuring point is apart from 250 millimeters places, mouth of pipe center in the air strainer suction port plane).
2. the required sound deadening capacity frequency characteristic of suction tude noise determines
Because the suction tude noise is made up of burning outburst fundamental frequency and harmonic series thereof, so in linear sound pressure level third-octave frequency spectrum, the CF center frequency place of diesel combustion outburst fundamental frequency and harmonic wave place frequency band thereof will produce than the high sound pressure level spike.According to noise-cancelling theory, total hope makes the fundamental frequency noise obtain bigger decay, and each harmonic noise is also decayed accordingly.But the frequency of noise elimination characteristic of expansion chamber silencing apparatus is low more, and the length of silencing apparatus is just long more.In general, the burning of domestic high-speed diesel engine outburst fundamental frequency is desired to make this fundamental frequency noise to obtain effective attenuation and certainly will be made the silencing apparatus size very long and can not be coupled on the diesel engine, do not reach designing requirement all below 100HZ.Therefore determine rightly that the required sound deadening capacity frequency characteristic of suction tude is to guarantee that the suction tude silencing apparatus has an important ring of minimum volume and superperformance.
Because the attenuation characteristic of A weighting network is: bigger to the decay of arbitrarily downgrading of the little responsive all-bottom sound of people's ear, intermediate frequency sound pressure level attenuation reduces gradually, and the more sensitive high frequency sound pressure level of people's ear is then composed with the negative attenuation amount.So, usually all with the evaluation index of A weighted sound pressure level as diesel engine noise.In A weighted sound pressure level third-octave frequency spectrum, the sound pressure level spike of the CF center frequency of diesel combustion fundamental frequency and low-order harmonic frequency place frequency band thereof is after the decay of A weighted attenuation network, total A sound level is not constituted main influence, and presented a higher crest of intermediate frequency sound pressure level.Be the required sound deadening capacity frequency characteristic that available A weighted sound pressure level third-octave frequency spectrum is determined the suction tude noise like this.Take so practical and effective method, can make required sound deadening capacity frequency concentrate on the intermediate frequency section, both avoided the suction tude silencing apparatus long, make the A sound level of suction tude noise obtain effective attenuation again.
3. maximum sound deadening capacity and silencing apparatus divergence ratio m determine
After getting rid of exhaust sound, measure total A sound level of the diesel engine noise when containing the suction tude noise and not containing the suction tude noise respectively, both differences are the lower limit of maximum sound deadening capacity.The sound deadening capacity of Que Dinging can make the divergence ratio of silencing apparatus less and obtain best noise elimination effect like this.
Because the divergence ratio of silencing apparatus is directly proportional with sound deadening capacity, that sound deadening capacity will be tried to achieve is big more, divergence ratio also will be tried to achieve greatly more, makes expansion cavity cross-section area S
2Also big more.Should be noted that, when silencing apparatus has than the bigger sound deadening capacity of the noise elimination value of determining thus, its noise elimination effect determines that the noise elimination effect of the silencing apparatus of sound deadening capacity is consistent because of can not get effectively performance with having with said method, but the volume of silencing apparatus has increased.This is because after the suction tude noise reduction arrives to a certain degree, the size that other noises of diesel engine become to take as the leading factor sound source and arranging diesel engine work noise then, so the sound deadening capacity of suction tude silencing apparatus designs to such an extent that also can not obtain bigger noise elimination effect to diesel engine work noise greatly again.Certainly also can suitably relax sound deadening capacity,, prevent that the suction tude noise from becoming main noise source heavily again in order to after other noises are controlled.
Determine after the maximum sound deadening capacity, can determine the divergence ratio m value of silencing apparatus and the inside diameter D of definite expansion cavity 5 thus with reference to table one.
The relation of maximum sound deadening capacity of table one and divergence ratio m
| m | Decibel | m | Decibel | m | Decibel | m | Decibel |
| 1 2 3 4 5 | 0 1.9 4.4 6.5 8.5 | 6 7 8 9 10 | 9.8 11.1 12.2 13.2 14.1 | 12 14 16 18 20 | 45.6 16.9 18.1 19.1 20.0 | 22 24 26 28 30 | 20.8 21.6 22.3 22.9 23.5 |
4. silencing apparatus expansion cavity 5 length L determines
The sound deadening capacity of expansion chamber silencing apparatus is determined by following formula
△L
f＝10Qg［1＋1／4·（m－1／m）
2Sin
2KL］（1）
In the formula (1): △ L
fA pair of frequency is the sound deadening capacity (dB) of the sound of f;
M-silencing apparatus divergence ratio, m=S
2/ S
1
S
2-expansion cavity cross-section area (square metre);
S
1-suction tude cross-sectional area (square metre);
The K-wave number, K=2 π f/c;
L-expansion cavity length (rice);
F-frequency of noise elimination (HZ);
The C-velocity of sound, the C=331.5+0.61t(meter per second);
Air dielectric temperature in the t-silencing apparatus (℃).
Being known by formula (1), is that (during the odd-multiple of λ=c/f), promptly during the KL=pi/2, sound deadening capacity is greatly to quarter wavelength λ, △ L at the long L of expansion chamber
f=△ L
MaxTherefore, according to the required sound deadening capacity frequency characteristic of determining by A weighted sound pressure level third-octave frequency spectrum, can determine to have the respective center frequency f of maximum sound deadening capacity
△ lmax, make the KL=pi/2, promptly have:
L＝C／4f
△lmax（2）
5. suction tude 1 perforated portion parameter determines
In order to eliminate silencing apparatus by near the noise elimination low ebb the frequency, L
1The length that stretches in the expansion cavity 5 is generally L/4, to eliminate even-multiple by the frequency low ebb; L
3The length that stretches in the expansion cavity 5 is generally L/2, to eliminate odd-multiple by the frequency low ebb.For improving the aerodynamic force and the anufacturability of silencing apparatus, sectional processing is L with length
2Perforated pipe whole suction tude is connected as a whole.Can reduce drag losses like this and make manufacturing more convenient.The punching rate of above-mentioned perforated pipe is promptly bored a hole the ratio of 6 area summation and perforation pipeline section circumferential area should 〉=25%.
In general, all less according to the silencing apparatus length L that the definite sound deadening capacity frequency characteristic of preceding method is designed, the acoustic attenuation performance of silencing apparatus does not have the frequency of passing through in intermediate frequency range.Therefore in this case, the gross area sum that should keep boring a hole approximates suction tude 1 cross-section area S
11.2～1.5 times, and determine L thus
2Length.Determine L thus
2After the length, can suitably shorten L
1, L
3Length or suitably increase punching rate.
According to the suction tude silencing apparatus of above-mentioned steps design, have best frequency of noise elimination characteristic and best noise elimination effect; And minimum structural volume and structure weight are arranged, be easy to manufacturing and installation and diesel engine work performance is remained unchanged.Similarly, said method also is applicable to the design of exhaust silencer.In addition, then can receive better noise elimination effect, not be described in detail here in conjunction with adopting resonator muffler for the decay of diesel combustion outburst fundamental frequency noise.
With reference to Fig. 3, the 495A diesel engine is installed into the third-octave contrast frequency spectrum of gas-pipe muffler front and back suction tude noise when rotating speed 2000rpm, and wherein curve 1 and curve 3 represent to be unkitted the A weighted curve and the linearity curve of suction tude silencing apparatus respectively; Curve 2,4 is represented A weighted curve and the linearity curve behind the threading muffler pipe respectively.
From Fig. 3 curve contrast as can be seen, the suction tude noise is from 105.8dB(A) reduce to 98.8dB(A).Intermediate frequency sound pressure level crest has obtained bigger reduction.
With reference to Fig. 4～Figure 10, the suction tude silencing apparatus that designs by the present invention can be installed on the existing diesel easily.According to the installation dimension that diesel engine air inlet system limited, can it be serially connected in the diesel engine intake road neatly; Also the suction tude silencing apparatus according to the present invention's design can be coupling in the structural design of air-strainer.Obviously, the air-strainer of this structure can not only satisfy the requirement of engine operation aspect of performance, and has satisfied the requirement to the noise elimination aspect of suction tude noise, and the performance of diesel engine is further improved.
Suction tude silencer of the present invention is coupling in the structure of dry-type air cleaner 10,20, and their housing can be connected as a single entity.The housing 11,21 of filter cleaner 10,20 is connected with the housing sidewall 2 and the end cap 4 of silencing apparatus, as Fig. 4, shown in Figure 5.Like this, have the suction tude 1 of perforation 6 and the filter core air flue UNICOM of air-strainer 10,20, its A end is positioned at the inside of air-strainer 10,20, and its B end is the outlet of air-strainer 10,20.
Suction tude silencer of the present invention is coupling in the structure of wet-type cleaner 30, and its housing can be connected as a single entity.The housing 31 of filter cleaner 30 is connected with the housing sidewall 2 of silencing apparatus and end cap 3, as shown in Figure 6.The suction tude 1 that has perforation 6 is communicated with for one with the suction tude 32 of air-strainer 30.The B end of silencing apparatus is positioned at the inside of air-strainer 30, and its A end is connected with the strainer 33 of air-strainer 30.
When suction tude silencer of the present invention was connected in series with dry-type air cleaner 40, the A of its suction tude 1 end was connected in series with the strainer 42 of air-strainer 40, and its B end is connected in series with the suction port 41 of air-strainer 40, as shown in Figure 7.In addition, the A of suction tude 1 end also can be connected in series with the air outlet 43 of air-strainer 40, as shown in Figure 8.
When suction tude silencer of the present invention was connected in series with wet-type cleaner 50, the A of its suction tude 1 end was connected in series with the strainer 52 of air-strainer 50, and its B end is connected in series with the suction port 51 of air-strainer 50, as shown in Figure 9.In addition, the A of suction tude 1 end also can be connected in series with the air outlet 53 of air-strainer 50, as shown in figure 10.
Table two is after Shanghai-50 tractor is installed suction tude silencing apparatus of the present invention, the contrast table of noise quality situation and original situation and domestic and international Tractor's Noise quality condition of the same type.
Table two. improve back Tractor's Noise and original situation and domestic and international Tractor's Noise contrast table
Shanghai-50 tractor is a power with aforementioned 495A diesel engine.The noise objective value of this machine does not reach the NBS requirement always for a long time.Employing the present invention design, in 495A diesel engine gas handling system, be connected in series a suction tude silencing apparatus as shown in Figure 9 after, cause this difficult problem of Shanghai Tractor Factory to obtain solution.In of three detections of tractor product quality supervision inspection center of Luoyang tractor research institute to Shanghai-50 Tractor's Noise quality, the other noise figure of operator on the tractor's ear by original＞96dB(A) stably reached the top grade product level of JB/NQ37.2-86 defined, on average reduced by 3～4dB.Static environment noise and dynamic environment noise all reduce about 4dB, and simultaneously, the power character of motor and tractor and Economy are still kept original level and do not become.(all seeing Table two).
In the wheeled tractor qulity appraisal that tractor research institute in Luoyang holds, Shanghai-50 tractor is also won the noise quality prize for separate items because of silencing apparatus of the present invention has been installed, and has obtained relevant expert's approval.
Claims (8)
1, a kind of diesel engine intake muffler pipe that includes the expansion cavity housing of suction tude, restriceted envelope volume is characterized in that,
A. suction tude 1 is passed the expansion cavity space that is limited by above-mentioned housing 2,3,4, and the entrance point A of this suction tude 1 and outlet end B are that one is communicated with;
B. above-mentioned suction tude 1 is positioned at one section many aperture 6 that are installed with UNICOM's suction tude 1 air flue and expansion cavity 5 in centre of part within the described expansion cavity 5.
2, suction tude silencing apparatus as claimed in claim 1 is characterized in that, described suction tude 1 overlaps substantially with the center line of expansion cavity 5, its sectional area S
1Be complementary with the diesel engine intake road.
3, suction tude silencing apparatus as claimed in claim 2 is characterized in that, the punching rate of described aperture 6 〉=25%, and the summation of perforation field is suction tude 1 cross-section area S
11.2～1.5 times.
4, suction tude silencing apparatus as claimed in claim 3 is characterized in that, described silencing apparatus and diesel engine air-strainer are planned as a whole design and be coupled as one.
5, as the described suction tude silencing apparatus of claim 1～4, it is characterized in that, the housing sidewall 2 of described silencing apparatus and end cap 4 are connected as a single entity with the housing 11,21 of dry-type air cleaner 10,20, and the filter core air flue of the entrance point A of described silencing apparatus suction tude 1 and air-strainer 10,20 is connected.
6, as the described suction tude silencing apparatus of claim 1～4, it is characterized in that, the housing sidewall 2 of described silencing apparatus and end cap 3 are connected as a single entity with the housing 31 of wet-type cleaner 30, and described silencing apparatus suction tude 1 is communicated with for one with the suction tude 32 of air-strainer 30.
As the described suction tude silencing apparatus of claim 1～3, it is characterized in that 7, the suction tude 1 of described silencing apparatus is serially connected between the suction port 41,51 of strainer 42,52 and air-strainer 40,50.
As the described suction tude silencing apparatus of claim 1～3, it is characterized in that 8, the entrance point A of described suction tude 1 is connected with the outlet 43,53 of air-strainer 40,50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88203144 CN2032256U (en) | 1988-02-05 | 1988-02-05 | Diesel engine intake silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88203144 CN2032256U (en) | 1988-02-05 | 1988-02-05 | Diesel engine intake silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2032256U true CN2032256U (en) | 1989-02-08 |
Family
ID=4838024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88203144 Withdrawn CN2032256U (en) | 1988-02-05 | 1988-02-05 | Diesel engine intake silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2032256U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387823C (en) * | 2006-06-02 | 2008-05-14 | 河南天瑞环保新材料有限公司 | Silencing filter suitable for supercharging internal combustion engine air inlet system |
| CN100392233C (en) * | 2006-07-23 | 2008-06-04 | 重庆长安汽车股份有限公司 | Engine air filter inlet pipe structure |
| CN101255833B (en) * | 2007-03-02 | 2011-11-23 | 通用汽车环球科技运作公司 | Air induction housing having a perforated sound attenuation wall |
| CN101270712B (en) * | 2007-03-22 | 2012-05-23 | 东洋沪机制造株式会社 | Muffle duct |
| CN102654089A (en) * | 2011-03-04 | 2012-09-05 | 通用汽车环球科技运作有限责任公司 | Air duct assembly for engine |
| CN104005889A (en) * | 2014-06-13 | 2014-08-27 | 成都万友滤机有限公司 | Combined resonator |
| CN104196593A (en) * | 2014-08-28 | 2014-12-10 | 长城汽车股份有限公司 | Silencer and vehicle with silencer |
| CN104847929A (en) * | 2015-05-28 | 2015-08-19 | 珠海格力电器股份有限公司 | Composite one-way valve |
| CN113482756A (en) * | 2021-08-20 | 2021-10-08 | 泰豪电源技术有限公司 | Exhaust muffler modular design method |
| CN113639135A (en) * | 2021-07-09 | 2021-11-12 | 广西科技大学 | Helmholtz silencer structure capable of actively adjusting perforation rate |
-
1988
- 1988-02-05 CN CN 88203144 patent/CN2032256U/en not_active Withdrawn
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387823C (en) * | 2006-06-02 | 2008-05-14 | 河南天瑞环保新材料有限公司 | Silencing filter suitable for supercharging internal combustion engine air inlet system |
| CN100392233C (en) * | 2006-07-23 | 2008-06-04 | 重庆长安汽车股份有限公司 | Engine air filter inlet pipe structure |
| CN101255833B (en) * | 2007-03-02 | 2011-11-23 | 通用汽车环球科技运作公司 | Air induction housing having a perforated sound attenuation wall |
| CN101270712B (en) * | 2007-03-22 | 2012-05-23 | 东洋沪机制造株式会社 | Muffle duct |
| CN102654089A (en) * | 2011-03-04 | 2012-09-05 | 通用汽车环球科技运作有限责任公司 | Air duct assembly for engine |
| CN102654089B (en) * | 2011-03-04 | 2015-06-03 | 通用汽车环球科技运作有限责任公司 | Air duct assembly for engine |
| CN104005889A (en) * | 2014-06-13 | 2014-08-27 | 成都万友滤机有限公司 | Combined resonator |
| CN104196593A (en) * | 2014-08-28 | 2014-12-10 | 长城汽车股份有限公司 | Silencer and vehicle with silencer |
| CN104196593B (en) * | 2014-08-28 | 2017-05-17 | 长城汽车股份有限公司 | Silencer and vehicle with silencer |
| CN104847929A (en) * | 2015-05-28 | 2015-08-19 | 珠海格力电器股份有限公司 | Composite one-way valve |
| CN113639135A (en) * | 2021-07-09 | 2021-11-12 | 广西科技大学 | Helmholtz silencer structure capable of actively adjusting perforation rate |
| CN113482756A (en) * | 2021-08-20 | 2021-10-08 | 泰豪电源技术有限公司 | Exhaust muffler modular design method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |