CN100339570C - Exhaust muffler for internal combustion engine - Google Patents
Exhaust muffler for internal combustion engine Download PDFInfo
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- CN100339570C CN100339570C CNB2004100258734A CN200410025873A CN100339570C CN 100339570 C CN100339570 C CN 100339570C CN B2004100258734 A CNB2004100258734 A CN B2004100258734A CN 200410025873 A CN200410025873 A CN 200410025873A CN 100339570 C CN100339570 C CN 100339570C
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Abstract
The present invention discloses an internal combustion engine, particularly a silencer used for motorcycles or automobiles. The present invention has the structure that an airtight cavity is provided with two pipes communicated with the outside, wherein one pipe is a gas inlet pipe connected with a tail gas pipe of an internal combustion engine, the other pipe is a gas exhaust pipe which communicates the airtight cavity with the outside, the wall of the gas inlet pipe connected with the tail gas pipe of the internal combustion engine is axially provided with a plurality of gas exhaust holes at equal intervals, and the number of the gas exhaust holes is increased as the distances among a gas inlet and the gas exhaust holes are increased.
Description
Technical field
The present invention relates to the exhaust silencer that a kind of internal-combustion engine uses, especially for the exhaust silencer of motorcycle or automobile use.
Background technique
Existing internal combustion engine exhaust silencer mainly is that the sound arrester in the utilized device stops or with the principle that noise energy absorbs, realizes eliminating the purpose of noise.The existing general structure of silencing apparatus is comparatively complicated, simultaneously because of its noise elimination mechanism, exhaust resistance is strengthened, and this can influence the proper functioning of internal-combustion engine on the contrary.
For example a kind of internal combustion engine silencing apparatus of unsteady flow and the design of gas injection noise elimination technique has been adopted in Chinese invention patent application 85109438 disclosed " air-resistance internal combustion engine muffler ".It is made up of muffler shell, diversion chamber, expansion chamber, gas injection chamber and porous circular cylinder resonant chamber.This muffler design uniqueness, anechoic frequency bandwidth, the noise elimination effect may be better, but its structure is wanted complexity relatively.
And for example Chinese utility model patent 02277729.6 disclosed " the efficient silencing apparatus of making an uproar that removes ", adopt materials such as plastics, metal to be arranged to polygon cone, polygon cone is provided with outer cover, be provided with the awl core in the cone outer cover, it is horn-like that shape is, be provided with some micropores on cone outer cover and awl core, the cone outer cover is installed in the porous sound absorption plate, and awl core tail end is arranged in the air chamber.From this silencing apparatus of disclosed structure complex structure not only, and may make the engine exhaust resistance that bigger increase is arranged.
Summary of the invention
The objective of the invention is to overcome the prior art deficiency, provide a kind of structure comparatively simple, better noise elimination effect is arranged, exhaust is more unobstructed, the model muffler of exhaust resistance minimum.
The present invention is the phase-shifter tube that is used to postpone the circulation airflow sound wave by, an airtight chamber and an end are positioned at airtight chamber and the other end and the extraneous outlet pipe that is connected are formed, wherein the suction port of phase-shifter tube is communicated with exhaust opening of engine, the relief opening of phase-shifter tube is communicated with airtight chamber, and the tube wall of phase-shifter tube is provided with at least one tap hole, each tap hole is communicated with airtight chamber, equal 0.10～0.99 times of exhaust port area with the aperture area sum of respectively shunting on the nearest cross section of phase-shifter tube relief opening, the aperture sum of respectively shunting on second cross section adjacent with this cross section equals this cross section and respectively shunts 0.10～0.99 times of aperture sum, and the aperture sum of respectively shunting on N+1 cross section equals respectively to shunt on the N cross section 0.10～0.99 times of aperture sum.
If among the present invention phase-shifter tube is placed within the airtight chamber, can make its structure more simple.
Phase-shifter tube can be garden type layout in the present invention in addition, also can S-typely arrange, can also be the multi-circle spiral flow shape and arrange, even phase-shifter tube is made the ring-like layout of square frame, perhaps is made as the square frame helical and arranges.
To more special application, the present invention is in series aforesaid at least two silencing apparatuss, and wherein the outlet pipe of first silencing apparatus is the suction tude of second silencing apparatus.
The present invention can also change aforesaid phase-shifter tube into the exhaust phase-shifter tube, with aforesaid outlet pipe as suction tude, formation is by a phase shift outlet pipe that is used to postpone the circulation airflow sound wave, an airtight chamber and an end are positioned at airtight chamber and outlet pipe that the internal-combustion engine of the composition of the suction tude that the other end is connected with engine exhaust pipe is used, the suction port of exhaust phase-shifter tube wherein is communicated with airtight chamber, the relief opening of exhaust phase-shifter tube is in communication with the outside, the tube wall of exhaust phase-shifter tube is provided with at least one tap hole, each tap hole is communicated with airtight chamber, equal 0.10～0.99 times of suction port area with the aperture area sum of respectively shunting on the nearest cross section of exhaust phase-shifter tube suction port, the aperture sum of respectively shunting on second cross section adjacent with this cross section equals this cross section and respectively shunts 0.10～0.99 times of aperture sum, and the aperture sum of respectively shunting on N+1 cross section equals respectively to shunt on the N cross section 0.10～0.99 times of aperture sum.According to the baffler of relevant test it and aforementioned structure much at one effect is arranged.
Can be positioned within the airtight chamber at exhaust phase-shifter tube under this basic structure.Exhaust phase-shifter tube of the present invention on the other hand can be that the garden type is arranged, also can be that the S type is arranged, can also be to be the multi-circle spiral flow shape to arrange, frame type is arranged, can also be the square frame helical and arrange.And can be in series with two such silencing apparatuss, wherein the relief opening of first silencing apparatus is the suction port of second silencing apparatus.
Need to prove that especially the tap hole of being opened on the phase-shifter tube of the present invention can be a rule setting, for example equidistant segmentation setting also can irregular continuous arrangement.
The present invention is owing to there is a phase-shifter tube that can make the discharging of air-flow differential, with the airtight chamber that is used for through the gas of differential discharging, particularly be in the structure of seal container inside at phase-shifter tube, enter portion gas in the phase-shifter tube by the direct of travel of air-flow, carry out bleed off by tap hole, so just make the air-flow pulse of flowing through from phase-shifter tube by aperture the time, to the seal container space drainage a bit, and residual impulse air-flow and sound wave flow out by the tap hole of back and the port of giving vent to anger of phase shift pipeline.Offer in addition in seal container with the identical exhaust outlet of air inlet pipeline Throughput, the inlet end of relief opening is positioned within the seal container, and the outlet side of relief opening is positioned at outside the seal container, introduces the appropriate location discharging after directly being communicated with atmosphere or installing pipeline additional.
Principle of the present invention is: the dependent narrow pulse acoustic wave significantly that produces when internal-combustion engine is broken out, utilize its stroke to postpone phase shift at a circulation pipeline that flows through, and shunt in succession by many tap holes of being offered on the channel wall, and the entrained sound wave of air-flow carried out phase shift, with one significantly, the burst pulse of high loudness resolves into the string of burst pulse by a small margin behind a plurality of phase place phase retardations, carry out processing such as similar integration, combination, filtering by the large space effect in the airtight chamber again, be treated as the broad pulse of low loudness by a small margin.And in this course, the unobstructed substantially effect of paired pulses sound air-flow, perhaps stop very little, simultaneously with air-flow and entrained a part of phase shift of timesharing in succession and the shunting bleed off of a sound wave part, in airtight chamber, again the small-pulse effect of back one bleed off is connected the small-pulse effect afterbody of previous bleed off, make single significantly prominent detonans ripple air-flow, change the pulsation sound wave air-flow string that a plurality of little fluctuatings connect together into, under the large space effect of this air-flow string in airtight chamber, produce similar combination, filter action, form broad pulse by a small margin.
Working procedure of the present invention is as follows: when the blast that produces in the engine operation flows into the phase shift pipeline, because the air pressure in the phase shift pipeline is higher than the outer air pressure of pipeline, the pulsed sound air-flow can constantly be discharged in the outer closed cavity of pipeline by tap hole set on the phase-shifter tube successively in the pipe.In this working procedure, it is inevitable early than the time that arrives back one tap hole that air-flow runs into last tap hole, and the sound wave air-flow pulse that back one tap hole flows out postpones to appear at after the last pulse naturally.Because the sound wave pulse that flows out through tap hole decomposes from the overall pulse air-flow, peak intensity is less than the peak intensity of overall pulse sound wave; Postpone in succession to occur making follow-up crest to produce phase shift, move after each small echo summit successively of phase shift successively and arrange the row bunchiness that begins to rehearse, in the cavity outside the phase shift pipeline again the group and, become a broad pulse that several little fluctuating pulse series connection are arranged, this broad pulse connects behind the retardation successively of small-pulse effect because be, the crest phase place staggers mutually, obtained continuity so connect the width of afterpulse, and the height of pulse remains the peak value of small-pulse effect, and the result is: utilize the width that increases pulse to reduce the intensity of pulse.
The phase shift function inventor that the air-flow bleed off of realizing by the tap hole on the tube wall reaches sound wave is referred to as to call the differential function.Since the aperture of each or each section tap hole be number/one of the total bore of phase shift pipeline to tens of/one, from the pulsing airflow sound amplitude that each tap hole occurs, number/one who also is total air flow sound is to tens of/one; Phase shift function is the extremely distance decision of back one tap hole (annotate: the front and back of tap hole are meant along the axial position of phase-shifter tube herein) of last tap hole on the pipeline, last aperture to the distance of back～aperture divided by the air-flow velocity of sound, back one aperture lag time of pulse occurs than last aperture exactly, the time chien shih Pulse wave peak Phase delay of hysteresis.The pulsing airflow by a small margin that a plurality of phase places that produce through differential are moved after in succession also must flow to outlet successively by the sequencing that shunting is come out, and could form the exhaust airstream of a little fluctuating of low amplitude.Because the intensity of sound is fluctuating range, reduced the air-flow output of fluctuating range, also just reduced the noise volume and the loudness of exhaust airstream.
The effect of differential in the present invention be with one significantly burst pulse be decomposed into a plurality of burst pulses by a small margin, the effect of phase shift is, postpones phase shift with decomposing a plurality of burst pulses by a small margin of coming out.Two kinds of effects of differential phase shift are to possess simultaneously, indispensable, if only decompose not phase shift, crest is to crest when reconfiguring, although be a plurality of burst pulses by a small margin, but the crest energy coincides together during the homophase superposition, still be combined into a burst pulse significantly, intensity of sound can not change, if phase shift differential not only, a crest is moved past after several crests, the amplitude of crest can not reduce yet, and intensity of sound can not change yet, so must be through the differential range of decrease, postpone the phase shift combination, just can reach the purpose that reduces noise.
Concrete enforcement structure of the present invention is as follows:
During according to internal combustion engine, the explosion sound wave impulse produced in the moment of exhauxt valve opens, the wide increase with internal-combustion engine rotational speed of Pulse wave is shortened, pulse strength improves with the increase of rotating speed, and pulse energy is very big, therefore outer casing must not deform housing with certain rigid material and the geometric shape with camber line structure when the powerful gas shock of inside, does not make sound transmit out by housing.
Press the air-flow direct of travel on the tube wall of phase shift pipeline by little extremely big, or by few at the most or segmentation or offer the airflow diversion hole continuously, its last or one group tap hole, be 0.10～0.99 times of exhaust port area promptly, equal respectively to shunt 0.10～0.99 times of aperture sum apart on N cross section at a distance of the aperture sum of respectively shunting on N+1 the cross section with the phase-shifter tube exhaust port with the phase-shifter tube exhaust port with the aperture gross area of an exhaust port of phase shift outlet pipe nearest or a component discharge orifice.According to test, the quantitative value of in different structure, successively decreasing, previous is to select to be optimum value between back one 1/2-4/5 times.In the one-level air exhaust muffler device, the empty minimum number of shunting is 1 or 1 group, and quantity is not limit at most.Experience shows that the aperture of tap hole is more little, and quantity is The more the better, and it can make the sound wave air-flow increase friction by hole wall the time, further improves the noise elimination effect.
Experience shows, when the length of phase shift pipeline generally is not lower than the internal-combustion engine maximum speed, and 1/2 of short burst projection wavelength.For example: the pulse projection wavelength of four cylinder four-stroke internal combustion engines when 6000 change is 0.66 meter, and 0.66 to multiply by 1/2 be 0.33 meter, and the length of phase shift pipeline should be more than 0.33 meter.The longer the better for the length of phase shift pipeline, but when reaching 10 times of the length of the shortest phase shift pipeline, exhaust sound is very faint, and the length necessity that continues to increase the phase shift pipeline is little.
If tortuous arrival of phase shift pipeline exports, previous differential mouth is to the distance of exhaust outlet, more farther than a back differential mouth to the distance of exhaust outlet, previous differential mouth is to the distance of exhaust outlet, is the cophasing distance with a back differential mouth to the difference of the distance of exhaust outlet, this segment distance does not have the phase shift effect, just can reach the corresponding phase shift time should prolong this segment length when design phase shift pipeline after.
The cross-sectional area of phase shift pipeline gets final product just as original outlet pipe is supporting outside reaching.
If in the structure of this device suction port is exchanged use with relief opening, its noise elimination effect is with preceding identical.
The present invention has following advantage:
1. processing cost simple in structure is low
2. little to gas-flow resistance, little to the internal combustion engine influence
3. erasure effect can be provided with arbitrarily, but single-stage is used also plural serial stage application
4. can be processed into multiple profile to be applicable to various environment
5. can adopt the energy satisfied temperature requirement, mechanical strength, the various materials that are easy to process
Description of drawings
Fig. 1 is a best embodiment of the present invention
Fig. 2 is second kind of best embodiment of the present invention
Fig. 3 is the third best embodiment of the present invention
Fig. 4 is provided with embodiment for the S-type complications of phase shift pipeline
Fig. 5 is provided with embodiment for two-stage tandem
In above-mentioned figure:
A is a closed cavity.
B1 is a phase-shifter tube, and on it: K1 is a suction port, and K2 is the air outlet; F1, F2 ..., F6 ..., F12 is respectively tap hole.
B2 is an outlet pipe, and K3 suction port on it, K4 are relief opening.
B2` is the phase-shifter tube of second group of silencing apparatus among Fig. 4, and K1` is the suction port of pipe B2`, and K2` is the air outlet of pipe B2`, and A1 is the closed cavity of first order silencing apparatus, and A2 is the closed cavity of second level silencing apparatus.
Embodiment
Below in conjunction with accompanying drawing and embodiments of the invention detailed explanation.
The structure of device shown in Figure 1 is: A is the closed cavity of system and device, is provided with phase-shifter tube B1 and outlet pipe B2 within it.On the tube wall of pipe B1, have 6 component discharge orifice F1 to F6 of equidistant arrangement.Its working principle is: the air-flow of intake channel B1 at first flows out from the position of F1, and passes through tap hole F2-F6 thereafter in proper order, so that relief opening K2 flows out, enters in the A chamber.Pulsed sound air-flow through F1-F6, K2 differential flow out enters the passage of managing B2 from K3 again and flows out through the K4 mouth after mix through integration in the space of cavity A.
As can be seen from the figure, blast sound wave air-flow is when entering phase-shifter tube B arrival tap hole F1, having the part air-flow flows out from F1, residue sound air-flow continues to move ahead, some flows out from F2 again when arriving F2, remainder arrives F3, F4 respectively again, F5, F6 continue shunting and flow out, and last residual gas stream all flows out through K2.Sound wave and air-flow that sound wave that F2 flows out and air-flow flow out with F1, a period of time that can lag behind is T1, and the time of F3 hysteresis F2 is T2, and the time of F5 hysteresis F4 is T3, and the time of F6 hysteresis F5 is T4, the time of K2 hysteresis F6 is T5.Because the K3 mouth is nearest with the F1 split-flow opening, F1 enters the K3 mouth very soon and flows out after pulsing airflow occurring, the pulsing airflow of F2 flows out the back when arriving the K3 passway, approximately also will be through the amount of time of a T1, therefore approximately the stagnate amount of time of latter two T1 of the pulsing airflow that distributes of F2, the pulsing airflow that distributes than F1.F3, F4, F5, F6 and K2 mouth are when real work, the pulsing airflow that the shunting in back occurs, it all is the time that arrives the K3 mouth than the pulse that previous shunting occurs, the phase shift amount of time that the hysteresis phase-shifter tube is double, thereby the phase shift angle of pulsing airflow is doubled, also just be equivalent to phase shift pipeline length and double.This kind organization plan can effectively reduce the volume and the cost of phase shift pipeline and system and device.
Because the F1 split-flow opening is in the forefront of phase shift pipeline, the pressure maximum of pulsing airflow, after the F1 mouth is discharged a part, pressure was corresponding when remainder arrived the F2 mouth reduces, thereafter F3, F4, F5, the pressure of F6 mouth is more little after more, pressure is with this balance of chamber inner pressure strong basis when arriving the K2 mouth, therefore, the working condition of all split-flow openings is different, under different working conditions, if reach F1-F6, the pulsing airflow flow basically identical that each outlet of K2 occurs, the F1 aperture must be little, along with the continuous shunting of arriving differential hole, back before having, the pressure of pulsing airflow constantly reduces, and the aperture of F2-F6 should be strengthened successively.Hole number with the nearest component discharge orifice (being F6) of the relief opening K2 of phase-shifter tube B is 32 in the present embodiment, and the hole number in its last group of hole (being F5) is 16, reduce successively, and the F1 group only is 1 hole.
The practical application example of structure shown in Figure 1:
Internal-combustion engine model 491QE; The fuel gas and oil; Structure 4 cylinders 4 strokes; Discharge capacity 2.23L; Maximum (top) speed 6000 changes
The practical structures numerical value of this device knot is:
A: internal diameter 100mm, length 660mm;
B1: internal diameter 36mm is positioned at the indoor length 620mm of A;
B2: internal diameter 36mm is positioned at A interior length 620mm;
K1=K2=K3=K4 sectional area 1017mm
2
Total aperture area of tap hole F1-F6 is: F1=16mm
2, F2=32mm
2, F3=64mm
2, F4=128mm
2, F5=256mm
2, F6=512mm
2
The present embodiment measured result is as follows: when engine speed was 750 commentaries on classics, device portal place volume was 105db, and the device outlet port is 75db; When engine speed was 2000 commentaries on classics, the device portal place was 108db, and the device outlet port is 86db.
In Fig. 2 device outlet pipe B2 is made short tube, and be placed on parallel position, and the suction port of its relief opening and B1 pipe is in same end with phase-shifter tube B1.The relative structure of this structure is the simplest, but working principle is identical, and the noise elimination effect is also just the same with Fig. 1.
Fig. 3 is the structure of ring-like setting for phase-shifter tube, equally as can be seen, claims mutually pipe to be set to square or shape such as rectangular ring-type also is fine.On the other hand, also phase-shifter tube can be made round spiral or square helix structure, like this phase shift pipeline be extended coiling continuously, the phase shift pipeline length that can extend is greatly further strengthened the noise elimination effect.
Fig. 4 is the S-shaped tortuous constructional device that is provided with of phase-shifter tube.
Fig. 5 is the constructional device with 2 grades of aforesaid silencing apparatus series connection of the present invention.
Tap hole in the embodiments of the invention on the phase-shifter tube is regular segmentation setting, but also can the irregular continuous setting of not segmentation, but as long as tap hole by little to big or be listed on the whole piece phase shift pipeline by dredging to solid matter, promptly can reach good noise elimination effect equally.
If turn aforesaid structure around use, be about to phase-shifter tube as suction tude, and original outlet pipe is used as suction tude, same noise elimination effect also can be arranged.
Claims (14)
1, a kind of exhaust silencer of internal-combustion engine, it is characterized in that exhaust silencer is the phase-shifter tube that is used to postpone the circulation airflow sound wave by, an airtight chamber and an end are positioned at airtight chamber and the other end and the extraneous outlet pipe that is connected are formed, phase-shifter tube is positioned within the airtight chamber, wherein the suction port of phase-shifter tube is communicated with exhaust opening of engine, the relief opening of phase-shifter tube is communicated with airtight chamber, and the tube wall of phase-shifter tube is provided with at least one component discharge orifice, the tap hole chamber that phase-shifter tube is inner and airtight is communicated with, equal 0.5 times of exhaust port area with each aperture area sum of the nearest component discharge orifice of phase-shifter tube relief opening, each aperture sum of the second component discharge orifice adjacent with this component discharge orifice equals 0.5 times of each aperture sum of the first component discharge orifice, and each aperture sum of the tap hole of N+1 group equals 0.5 times of each aperture sum of the tap hole of N group.
2, the exhaust silencer of a kind of internal-combustion engine according to claim 1 is characterized in that phase-shifter tube is round layout.
3, the exhaust silencer of a kind of internal-combustion engine according to claim 1 is characterized in that the S-type layout of phase-shifter tube.
4, the exhaust silencer of a kind of internal-combustion engine according to claim 1 is characterized in that phase-shifter tube is the multi-circle spiral flow shape and arranges.
5, the exhaust silencer of a kind of internal-combustion engine according to claim 1 is characterized in that phase-shifter tube is the ring-like layout of square frame.
6, the exhaust silencer of a kind of internal-combustion engine according to claim 1 is characterized in that phase-shifter tube is the square frame helical and arranges.
7, according to the exhaust silencer of described any internal-combustion engine of claim 1 to 6, it is characterized in that being in series with two aforesaid silencing apparatuss at least, wherein the outlet pipe of first silencing apparatus is the suction tude of second silencing apparatus.
8, a kind of exhaust silencer of internal-combustion engine, it is characterized in that exhaust silencer is the phase shift outlet pipe that is used to postpone the circulation airflow sound wave by, an airtight chamber and an end are positioned at airtight chamber and the composition of the suction tude that the other end is connected with engine exhaust pipe, the exhaust phase-shifter tube is positioned within the airtight chamber, wherein the suction port of exhaust phase-shifter tube is communicated with airtight chamber, the relief opening of exhaust phase-shifter tube is in communication with the outside, and the tube wall of phase-shifter tube is provided with at least one component discharge orifice, the tap hole chamber that phase-shifter tube is inner and airtight is communicated with, equal 0.5 times of exhaust port area with each aperture area sum of the nearest component discharge orifice of phase-shifter tube relief opening, each aperture sum of the second component discharge orifice adjacent with this component discharge orifice equals 0.5 times of each aperture sum of the first component discharge orifice, and each aperture sum of the tap hole of N+1 group equals 0.5 times of each aperture sum of the tap hole of N group.
9, the exhaust silencer of a kind of internal-combustion engine according to claim 8 is characterized in that the exhaust phase-shifter tube is round layout.
10, the exhaust silencer of a kind of internal-combustion engine according to claim 8 is characterized in that the S-type layout of exhaust phase-shifter tube.
11, the exhaust silencer of a kind of internal-combustion engine according to claim 8 is characterized in that the exhaust phase-shifter tube is the multi-circle spiral flow shape and arranges.
12, the exhaust silencer of a kind of internal-combustion engine according to claim 8 is characterized in that the exhaust phase-shifter tube is frame type and arranges.
13, the exhaust silencer of a kind of internal-combustion engine according to claim 8 is characterized in that the exhaust phase-shifter tube is the square frame helical and arranges.
14, according to Claim 8 to the exhaust silencer of 13 described any internal-combustion engines, it is characterized in that being in series with two aforesaid silencing apparatuss at least, wherein the relief opening of first silencing apparatus is the suction port of second silencing apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100258734A CN100339570C (en) | 2004-02-10 | 2004-02-10 | Exhaust muffler for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100258734A CN100339570C (en) | 2004-02-10 | 2004-02-10 | Exhaust muffler for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1654791A CN1654791A (en) | 2005-08-17 |
| CN100339570C true CN100339570C (en) | 2007-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100258734A Expired - Fee Related CN100339570C (en) | 2004-02-10 | 2004-02-10 | Exhaust muffler for internal combustion engine |
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| CN (1) | CN100339570C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111473565B (en) * | 2019-01-23 | 2022-11-18 | 青岛海尔电冰箱有限公司 | Refrigerating and freezing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2143262Y (en) * | 1992-06-29 | 1993-10-06 | 江苏工学院 | Exhaust hush pipe of single cylinder diesel engine |
| US5620506A (en) * | 1990-11-26 | 1997-04-15 | The Social Welfare Foundation Hokkaido Rehabily | Activated carbon, production thereof and adsorption using activated carbon |
| CN2292904Y (en) * | 1996-10-09 | 1998-09-30 | 韦守先 | Double diffraction absorption energy-saving silencer |
| CN2296404Y (en) * | 1996-11-26 | 1998-11-04 | 曾尚初 | Low resistance high efficiency silencer |
-
2004
- 2004-02-10 CN CNB2004100258734A patent/CN100339570C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5620506A (en) * | 1990-11-26 | 1997-04-15 | The Social Welfare Foundation Hokkaido Rehabily | Activated carbon, production thereof and adsorption using activated carbon |
| CN2143262Y (en) * | 1992-06-29 | 1993-10-06 | 江苏工学院 | Exhaust hush pipe of single cylinder diesel engine |
| CN2292904Y (en) * | 1996-10-09 | 1998-09-30 | 韦守先 | Double diffraction absorption energy-saving silencer |
| CN2296404Y (en) * | 1996-11-26 | 1998-11-04 | 曾尚初 | Low resistance high efficiency silencer |
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| CN1654791A (en) | 2005-08-17 |
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Granted publication date: 20070926 Termination date: 20100210 |