CN2120884U - Exhaust muffler for internal-combustion engine - Google Patents
Exhaust muffler for internal-combustion engine Download PDFInfo
- Publication number
- CN2120884U CN2120884U CN 91203816 CN91203816U CN2120884U CN 2120884 U CN2120884 U CN 2120884U CN 91203816 CN91203816 CN 91203816 CN 91203816 U CN91203816 U CN 91203816U CN 2120884 U CN2120884 U CN 2120884U
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- CN
- China
- Prior art keywords
- internal
- combustion engine
- iii
- sound
- chamber
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 20
- 230000003584 silencer Effects 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000030279 gene silencing Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
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- Exhaust Silencers (AREA)
Abstract
The utility model discloses an exhaust muffler for internal-combustion engines, successively comprising expanding chambers I, II and III, a resonant chamber and sound-absorbing pipes 1, 2, 3 and 4 with different length. Both ends of the sound-absorbing pipe 1 are respectively communicated with an exhaust pipe of the internal-combustion engine and the expanding chamber I; both ends of the sound-absorbing pipe 2 are respectively communicated with the expanding chamber II and III; both ends of the sound-absorbing pipe 3 are respectively communicated with the expanding chamber II and III; both ends of the sound-absorbing pipe 4 are respectively communicated with the expanding chamber II and atmospheric air and pass through the expanding chamber III and the resonant chamber; the sound-absorbing pipe 4 is provided with small holes on the corresponding position of the resonant chamber and is communicated with the resonant chamber. The utility model has the advantages of simple process and easy production. Compared with an empty pipe used in the internal-combustion engine, the exhaust noise of the utility model can be decreased by 24 dB (A).
Description
The utility model relates to silencing apparatus and relates in particular to exhaust silencer for internal-combustion engine.
The exhaust sound of internal-combustion engine is a topmost noise source in all single sound sources of internal-combustion engine, and reducing the effective method of exhaust sound is to fix a silencer in gas exhaust piping.The most of sound deadening capacities of internal combustion engine exhaust silencer that China uses at present are low, can not satisfy the requirement of noise abatement act rule.
The purpose of this utility model provides the big and few exhaust silencer for internal-combustion engine of power loss of a kind of noise reduction.
Elaborate below in conjunction with accompanying drawing.
Fig. 1 is the schematic representation of end face air inlet exhaust silencer for internal-combustion engine.
Fig. 2 is the schematic representation of side air inlet exhaust silencer for internal-combustion engine.
Main points of the present utility model are: it has expansion cavity I, II, III successively, the resonant cavity IV, and be provided with the hush tube 1,2,3,4 of different length, hush tube 1 two ends communicate with internal combustion engine blast pipe and expansion cavity I respectively, hush tube 2 two ends communicate with expansion cavity I, III respectively, and pass the expansion cavity II, hush tube 3 two ends communicate with expansion cavity II, III respectively, hush tube 4 two ends communicate with expansion cavity II and atmosphere respectively, and passing expansion cavity III and resonant cavity IV, hush tube 4 has aperture and communicates with resonant cavity in the resonant cavity relevant position. Hush tube 1 is located at end face or the side of expansion cavity I.
Exhaust stream footpath route is, exhaust enters the expansion of I chamber from end face or side by hush tube 1, entering the III chamber through hush tube 2 then expands, being back to the II chamber through hush tube 3 again expands, flow at last hush tube 4, hush tube 4 has a few row's apertures in relevant position, IV chamber, and exhaust stream enters atmosphere after the resonant cavity IV.
Blast air enters expansion cavity for three times through silencing apparatus and expands, and the flow direction of air-flow in the chamber also all changes, and enters atmosphere again behind resonant cavity.By the combination of hush tube and expansion cavity, because pipeline section is expanded suddenly, the pipeline sound wave reflects, produces phase interference in abrupt change of cross-section place to sound source; And the frictional loss that the flow direction of air-flow changes and resonance makes air-flow greatly, greatly, therefore acoustic energy dissipate the noise elimination effect that can obtain.Because the air current flow of exhaust adopts the mode of axial flow, the air current flow resistance is little.Therefore the power loss increase little, fuel consume of internal-combustion engine is also little, and the processing technology of silencing apparatus is simple, easy to manufacture.
After internal-combustion engine used this exhaust silencer, exhaust sound descended obviously.Compare with blank pipe, noise reduction can reach 24dB(A), and power loss and fuel consumption rate increase all are not more than 1%.The exhausting silencer that it not only can be used for mobile internal-combustion also can be used for the exhausting silencer of fixed internal-combustion engine.
Claims (2)
1, a kind of exhaust silencer for internal-combustion engine, it is characterized in that it has expansion cavity (I) successively, (II), (III), resonant cavity (IV), and be provided with the hush tube (1) of different length, (2), (3), (4), hush tube (1) two ends communicate with internal-combustion engine vent-pipe and expansion cavity (I) (III) respectively, hush tube (2) two ends respectively with expansion cavity (I), (III) communicates, and pass expansion cavity (II), hush tube (3) two ends respectively with expansion cavity (II), (III) communicates, hush tube (4) two ends communicate with expansion cavity (II) and atmosphere respectively, and passing expansion cavity III and resonant cavity (IV), hush tube (4) has aperture and communicates with resonant cavity on resonant cavity (IV) relevant position.
2, a kind of exhaust silencer for internal-combustion engine according to claim 1 is characterized in that said hush tube (1) is located at the end face or the side of expansion cavity (I).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91203816 CN2120884U (en) | 1991-03-13 | 1991-03-13 | Exhaust muffler for internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91203816 CN2120884U (en) | 1991-03-13 | 1991-03-13 | Exhaust muffler for internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2120884U true CN2120884U (en) | 1992-11-04 |
Family
ID=4914038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91203816 Granted CN2120884U (en) | 1991-03-13 | 1991-03-13 | Exhaust muffler for internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2120884U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821603A (en) * | 2019-09-30 | 2020-02-21 | 西安交通大学 | Multistage turbine sound cascade formula automobile exhaust purifier |
-
1991
- 1991-03-13 CN CN 91203816 patent/CN2120884U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821603A (en) * | 2019-09-30 | 2020-02-21 | 西安交通大学 | Multistage turbine sound cascade formula automobile exhaust purifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |