CN201599083U - Muffler for vertical shaft petrol engine - Google Patents
Muffler for vertical shaft petrol engine Download PDFInfo
- Publication number
- CN201599083U CN201599083U CN2009202939235U CN200920293923U CN201599083U CN 201599083 U CN201599083 U CN 201599083U CN 2009202939235 U CN2009202939235 U CN 2009202939235U CN 200920293923 U CN200920293923 U CN 200920293923U CN 201599083 U CN201599083 U CN 201599083U
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Abstract
The utility model relates to a muffler for a vertical shaft petrol engine; a first chamber is formed between a left clapboard and a left shell, a second chamber is formed between a right clapboard and a right shell, and the second chamber is communicated with the first chamber by a first ostiole; a third chamber is formed at the upper part of the part where the left clapboard is not overlapped with the right clapboard, and is communicated with the second chamber by a second ostiole; an exhaust pipe is formed at the lower part of the part where the left clapboard is not overlapped with the right clapboard, and has the length of 50-70mm. The volume ratio between the first chamber and the second chamber as well as the volume ratio between the second chamber and the third chamber are 1.9-2.1; and the sizes of the first ostiole and the second ostiole are equal to each other, and the apertures thereof are 3.2-3.5mm. Under the condition that the performance of the petrol engine is not reduced, the muffler for the vertical shaft petrol engine can effectively reduce the noise to 1.5-2dB, thus not only achieving the aim of reducing the noise, but also thoroughly solving the problem of poor applicability of the muffler for the vertical shaft petrol engine and prolonging the service life of the muffler.
Description
Technical field
The utility model belongs to the technology of gasoline engine field, specifically, relates to a kind of vertical axis petrol engine silencing apparatus.
Background technique
Silencing apparatus is the tapping equipment of vertical shaft general gasoline engines, and main effect is to discharge petrolic waste gas.At present, vertical axis petrol engine silencing apparatus commonly used on the market is the expanssion type structure, generally by left shell, right shell body, left clapboard and right clapboard constitute, wherein left, right shell body is fixed into an integral body by make-up, on a left side, the inside of right shell body is provided with a left side, right clapboard, an and left side, overlapping of right clapboard, enclosure interior forms three chambers like this, be to form first chamber between left shell and the left clapboard, form second chamber between right shell body and the right clapboard, the 3rd chamber is formed at the top of left clapboard and the underlapped part of right clapboard, and outlet pipe is formed at the bottom of left clapboard and the underlapped part of right clapboard, and outlet pipe directly is communicated with the 3rd chamber.Petrolic waste gas at first enters first chamber by the suction port on the left shell, and first aperture of offering through left and right dividing plate lap enters second chamber again, enters the 3rd chamber by second aperture on the right clapboard then, is discharged by outlet pipe at last.Existing vertical axis petrol engine is simple in structure with the advantage of silencing apparatus, and volume is little, and is sturdy and durable, but also has following deficiency:
1, silencing apparatus diffusion volume is little.Vertical axis petrol engine discharge capacity conventional on the present market is between 120ml-180ml, and corresponding silencing apparatus diffusion volume has only about 500ml.General conventional silencing apparatus volume and petrol engine discharge capacity ratio should be between 3-10, volume ratio has only 2.77 for the petrol engine of 180ml discharge capacity, be significantly less than bottom line noise elimination requirement, can cause reducing the weak effect of high-speed pulse current rate like this, exhaust back pressure is big, and power loss is big.Simultaneously, muffler vibration is big, the surface temperature height.
2, the versatility of general conventional silencing apparatus is stronger, and a kind of silencing apparatus of specification goes for the vertical axis petrol engine of different displacements, also is applicable to the vertical axis petrol engine of the different rated engine speeds of same displacement.Present conventional silencing apparatus first chamber: second chamber: the volume ratio of the 3rd chamber is 4: 2.8: 1, and three chamber volume ratios can't adapt to motor real work requirement, can't satisfy to reduce the whole noise requirements of basic, normal, high audio-frequency noise.
3, in the general conventional acoustic wave filter structure, the aperture of first aperture is 5mm, and the spacing of two adjacent first apertures is 7～8mm, and the gross area of first aperture is 390～400mm
2The aperture of second aperture is 3mm, and the spacing of two adjacent second apertures is 7～8mm, and the gross area of second aperture is 190～200mm
2Silencing apparatus aperture big or small unreasonable, the first little hole number is few, and noise and aperture neck wall contact friction face are few, and the efficient that noise energy converts heat energy to is little, and noise can consuming little energy, and noise attentuation is little, reduces a little less than the effect of high frequency.The aperture of second aperture is smaller, and the gross area is less, and when air communication was crossed second aperture, airspeed was bigger, and the air-flow regenerated noise is big.Simultaneously, the hole pitch design is less, occurs the jet phenomenon easily.
4, the length of muffler tail pipe is shorter.According to the Huo Muzi resonance ideas, under different rotating speeds, exist a master who has nothing to do with spark rate and higher harmonics to shake frequently all the time, this main shaking frequently and petrol engine volume, the outlet pipe radius, outlet pipe length is relevant with the velocity of sound, and is inversely proportional to outlet pipe length.The length of former muffler tail pipe is shorter, has only 36mm, and this also is to cause one of bigger reason of silencing apparatus noise.In addition, outlet pipe length is shorter, reduces in the noise, a little less than the noisiness ability of low frequency part.
The model utility content
Technical problem to be solved in the utility model is to provide a kind of vertical axis petrol engine silencing apparatus that can effectively reduce noise.
The technical solution of the utility model is as follows: a kind of vertical axis petrol engine silencing apparatus, comprise left shell, right shell body, left clapboard and right clapboard, wherein left, the right shell body make-up is fixed into an integral body, on a left side, the inside of right shell body is provided with a left side, right clapboard, an and left side, overlapping of right clapboard, form first chamber between left clapboard and the left shell, form second chamber between right clapboard and the right shell body, second chamber is by a left side, first aperture that the right clapboard lap is offered communicates with first chamber, the 3rd chamber is formed at the top of described left clapboard and the underlapped part of right clapboard, the 3rd chamber communicates with second chamber by second aperture on the right clapboard, outlet pipe is formed at the bottom of left clapboard and the underlapped part of right clapboard, outlet pipe directly is communicated with the 3rd chamber, and its key is:
The volume of A, described silencing apparatus is 850～950ml;
The volume that the ratio of the volume between B, described first chamber and second chamber and the ratio of the volume between second chamber and the 3rd chamber are 1.9～2.1, first chamber be engine displacement 2-3 doubly;
The equal and opposite in direction of C, described first aperture and second aperture, the aperture is 3.2～3.5mm, and the gross area of first aperture is 380～390mm
2, the gross area of second aperture is 285～295mm
2
The length of D, described outlet pipe is 50～70mm.
The utility model spreads silencing apparatus to volume and increases to about 900ml, makes silencing apparatus volume and engine displacement ratio be 5-10.Do not influence assembling and attractive in appearance after increasing volume, cost is reasonable.By increasing volume, reduced the intensity of high-speed pulse air-flow, increased sound deadening capacity, and drag losses is little, has reduced back pressure, can further reduce the rubescent and reduction vibration noise of silencing apparatus.
Volume ratio between first chamber and second chamber, second chamber and the 3rd chamber is arranged to about 2 times, and the volume that makes first chamber is 2-3 times of engine displacement, the impact noise that is produced when engine combustion process and inlet and outlet door open and close in the time of so both can eliminating low speed, can reduce again motor when high speed exhaust in, low-frequency noise.This has just formed the full range silencing apparatus that can eliminate high, medium and low noise, and the applicability of silencing apparatus is strengthened greatly, and the cost of motor is reduced.
The equal and opposite in direction of first aperture and second aperture, quantity increases, and noise and aperture neck wall contact friction face increase, and the efficient that noise energy converts heat energy to improves, and noise can energy consumption increase, and noise attentuation increases, and the effect that reduces high frequency strengthens.By increasing the second little hole area, reduced the exhaust airstream flow velocity, make steady air current, reduced the impact noise of pulse pneumatic.In addition, the gross area of aperture makes motor when increasing sound deadening capacity greater than 1.5 times of the petrol engine exhaust port area like this, and engine power loss does not influence the normal use of motor than little.
According to the Huo Muzi resonance ideas, the length of outlet pipe is extended to 50～70mm, can reduce master oscillator frequenc 30-40Hz, can avoid simultaneously when engine low rotation speed, occurring noise low frequency half-wavelength resonance phenomenon in the outlet pipe, play the effect of noise reduction.
Cause low-frequency noise once more in order to prevent the jet phenomenon, the spacing of above-mentioned two adjacent first apertures is 10～12mm, and the spacing of two adjacent second apertures is 10～12mm.
Be provided with crisscross groove at above-mentioned left shell towards the inwall of left clapboard, right shell body also is provided with crisscross groove towards the inwall of right clapboard.Because noise is a kind of vibration, it makes air dielectric be the ripple transmission of density interphase, and physical phenomenons such as reflection, refraction, diffraction and interference can appear in the density sound wave of formation, forms resonance easily.Increase groove, the one, form interference surface, avoid occurring resonance and produce noise, increase the exhaust airstream friction energy loss, reduce the air-flow regenerated noise simultaneously; The 2nd, play the stiffening rib effect, improve silencing apparatus working life.
Test report of the present utility model is as follows:
In the above-mentioned test report, model machine #1 adopts the conventional muffler structure, volume is 500ml, first chamber in the silencing apparatus: second chamber: the volume ratio of the 3rd chamber is 4: 2.8: 1, and the aperture of first aperture is 5mm, and the spacing of two adjacent first apertures is 8mm, the gross area of first aperture is 400mm2, the aperture of second aperture is 3mm, and the spacing of two adjacent second apertures is 7mm, and the gross area of second aperture is 190mm
2, the length of outlet pipe is 36mm.
From test report, as can be seen, adopt silencing apparatus described in the utility model to compare, effectively noise reduction 1.5-2dB with conventional construction.
Beneficial effect: the utility model is under the situation that does not reduce the petrol engine performance, both reached the purpose of noise reduction, it is big thoroughly to have solved the petrol engine muffler vibration again, the problem that surface temperature is high, greatly improve the working life of silencing apparatus, had characteristics such as simple in structure, applied widely, that making is easy, cost of production is low.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the right elevation of Fig. 1.
Fig. 3 is the left view of Fig. 1.
Fig. 4 is the structural representation of left clapboard in the utility model.
Fig. 5 is the structural representation of right clapboard in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
As Fig. 1, Fig. 2, Fig. 3, Fig. 4 and shown in Figure 5, the utility model is made of left shell 1, right shell body 2, left clapboard 3 and right clapboard 4, the open-mouth end phase make-up of wherein left and right housing 1,2, by welding the fixing housing that forms silencing apparatus, the volume of silencing apparatus is 850～950ml, is preferably 900ml.In the inside of left and right housing 1,2 left and right dividing plate 3,4 is set, the edge of left and right dividing plate 3,4 is compressed by left and right housing 1,2.The plate of described left and right dividing plate 3,4 is facing opposite direction punching press, form convex closure, left and right like this dividing plate 3,4 is overlapping of punching press not, inside at suppressor case forms three chambers, form the first chamber I between left clapboard 3 and the left shell 1, the actual volume of the first chamber I is 2-3 times of engine displacement, and offers suction port on the left shell 1; Form the second chamber II between right clapboard 4 and the right shell body 2, several first apertures 6 that the second chamber II offers by left and right dividing plate 3,4 bottom laps communicate with the first chamber I.The aperture of first aperture 6 is 3.2～3.5mm, and the gross area of first aperture 6 is 380～390mm
2, the spacing of two adjacent first apertures 6 is 10～12mm, the aperture and the number of first aperture 6 are decided according to the actual requirements.Be formed with crisscross groove towards the inwall of left clapboard 3 by punching press at left shell 1, left shell 1 outer wall and the corresponding position of groove form projection 8.Also be formed with crisscross groove towards the inwall of right clapboard 4 by punching press at right shell body 2, right shell body 2 outer walls and the corresponding position of groove form projection 9.
From Fig. 1, Fig. 4 and Fig. 5 as can be known, left clapboard 3 forms the 3rd chamber III with the top of right clapboard 4 underlapped parts (being the convex closure part), the 3rd chamber III communicates with the second chamber II by several second apertures 7 of offering on the right clapboard 4, the aperture of second aperture 7 equates with the aperture of first aperture 6, be 3.2～3.5mm, the gross area of second aperture 7 is 285～295mm
2, the spacing of two adjacent second apertures 7 is 10～12mm, the aperture of second aperture 7 and number are determined according to actual needs.The ratio of the volume between the ratio of the volume between the described first chamber I and the second chamber II and the second chamber II and the 3rd chamber III is 1.9～2.1, is preferably 2 in the present embodiment.Left clapboard 3 forms outlet pipe 5 with the bottom of right clapboard 4 underlapped parts, and the upper end of outlet pipe 5 directly is communicated with the 3rd chamber III, and the bottom surface of suppressor case is stretched out in the lower end of outlet pipe 5, and the length of outlet pipe 5 is 50～70mm.
Claims (3)
1. vertical axis petrol engine silencing apparatus, comprise left shell (1), right shell body (2), left clapboard (3) and right clapboard (4), wherein left, right shell body (1,2) make-up is fixed into an integral body, on a left side, right shell body (1,2) inside is provided with a left side, right clapboard (3,4), an and left side, right clapboard (3, overlapping 4), form first chamber (I) between left clapboard (3) and the left shell (1), form second chamber (II) between right clapboard (4) and the right shell body (2), second chamber (II) is by a left side, right clapboard (3,4) first aperture (6) offered of lap communicates with first chamber (I), described left clapboard (3) forms the 3rd chamber (III) with the top of the underlapped part of right clapboard (4), the 3rd chamber (III) communicates with second chamber (II) by second aperture (7) on the right clapboard (4), left clapboard (3) forms outlet pipe (5) with the bottom of the underlapped part of right clapboard (4), outlet pipe (5) directly is communicated with the 3rd chamber (III), it is characterized in that:
The volume of A, described silencing apparatus is 850～950ml;
The volume that the ratio of the volume between the ratio of the volume between B, described first chamber (I) and second chamber (II) and second chamber (II) and the 3rd chamber (III) is 1.9～2.1, first chamber (I) be engine displacement 2-3 doubly;
The equal and opposite in direction of C, described first aperture (6) and second aperture (7), the aperture is 3.2～3.5mm, and the gross area of first aperture (6) is 380～390mm
2, the gross area of second aperture (7) is 285～295mm
2
The length of D, described outlet pipe (5) is 50～70mm.
2. vertical axis petrol engine silencing apparatus according to claim 1 is characterized in that: the spacing of described two adjacent first apertures (6) is 10～12mm, and the spacing of two adjacent second apertures (7) also is 10～12mm.
3. vertical axis petrol engine silencing apparatus according to claim 1, it is characterized in that: be provided with crisscross groove at described right shell body (2) towards the inwall of right clapboard (4), left shell (1) also is provided with crisscross groove towards the inwall of left clapboard (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202939235U CN201599083U (en) | 2009-12-29 | 2009-12-29 | Muffler for vertical shaft petrol engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202939235U CN201599083U (en) | 2009-12-29 | 2009-12-29 | Muffler for vertical shaft petrol engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201599083U true CN201599083U (en) | 2010-10-06 |
Family
ID=42810136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202939235U Expired - Lifetime CN201599083U (en) | 2009-12-29 | 2009-12-29 | Muffler for vertical shaft petrol engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201599083U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929370B (en) * | 2009-12-29 | 2012-01-11 | 力帆实业(集团)股份有限公司 | Silencer structure |
| CN104061055A (en) * | 2013-03-21 | 2014-09-24 | 本田技研工业株式会社 | Engine Muffler |
-
2009
- 2009-12-29 CN CN2009202939235U patent/CN201599083U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929370B (en) * | 2009-12-29 | 2012-01-11 | 力帆实业(集团)股份有限公司 | Silencer structure |
| CN104061055A (en) * | 2013-03-21 | 2014-09-24 | 本田技研工业株式会社 | Engine Muffler |
| CN104061055B (en) * | 2013-03-21 | 2016-08-17 | 本田技研工业株式会社 | Engine silencing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101006 Effective date of abandoning: 20091229 |