CN87207078U - Bag with coated binder - Google Patents
Bag with coated binder Download PDFInfo
- Publication number
- CN87207078U CN87207078U CN198787207078U CN87207078U CN87207078U CN 87207078 U CN87207078 U CN 87207078U CN 198787207078 U CN198787207078 U CN 198787207078U CN 87207078 U CN87207078 U CN 87207078U CN 87207078 U CN87207078 U CN 87207078U
- Authority
- CN
- China
- Prior art keywords
- expanding duct
- chamber
- expanding
- housing
- air
- 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.)
- Withdrawn
Links
Images
Landscapes
- Exhaust Silencers (AREA)
Abstract
The utility model discloses a silencer for an internal combustion engine exhaust system, which is especially suitable for a miniature diesel and a gasoline engine, strong air power performance, and silencing the noise, with a noise elimination value over 24 decibels. The utility model is composed of major parts, such as an air inlet pipe (1), a chamber (2), a diverging tube (3), a partition board (4), an air inflow pore (5), an air buffering hole (6), a body case (7), and an exhaust tube (8). The composite structure of a plurality of diverging tubes (3) and a plurality of air inflow pores (5) strengthens the denoising function. The first chamber (2) is utilized as a buffering chamber to reduce the instantaneous high value back pressure caused by surging flow and achieve the goal of denoising.
Description
The utility model relates to internal combustion engine exhaust system muffler, is specially adapted to small diesel engine, petrol engine aerodynamic force silencing apparatus.
Known small diesel engine, petrol engine silencing apparatus adopt aperture acoustic reactance structure more, and the air power noise that is accompanied by pulsing airflow causes the decay of noise during by the silencing apparatus inner aperture, reaches the noise reduction purpose.Owing to consider the diesel engine back pressure problems, the silencing apparatus fluid resistance has certain limit, so above-mentioned silencing apparatus, the noise elimination small aperture is bigger, and acoustic reactance is less, the pulse noise that produces in the time of can not eliminating diesel engine, gasoline exhaust effectively.The sieve type sound proof housing volume of above-mentioned silencing apparatus inlet end is little, and percent opening has certain limit again, and diesel engine work clock pulse qi of chong channel ascending adversely circulation causes instantaneous high value back pressure when sieving the type sound proof housing, influences the engine fuel economy energy.
The purpose of this utility model provides a kind of silencing apparatus that is suitable for small diesel engine, petrol engine, and its volume is little, and is in light weight, and gas-flow resistance is little, and decrease of noise functions is good, particularly is fit to be accompanied by the noise reduction work of the aerodynamic force very noisy of pulsing airflow and noise.
The utility model constitutes the cylindrical tube be a hollow, comprises the turnover air pipe, and the plurality of partitions in the housing, dividing plate and housing is prolonged shell space the expanding duct that is provided with on the chamber that axially is separated into and each dividing plate.
The utility model feature is by the shell internal partition housing to be prolonged axially to be divided into the chamber that volume differs in size, along first chamber volume maximum of airflow direction.On the dividing plate between chamber expanding duct is set, the suction port end face of expanding duct seals, on one section tube wall of contiguous expanding duct suction port end, have the air inlet aperture several, expanding duct exit end face and its axially are 60 ° angle.The Normal direction of this end face is pointed to the inner walls surface, and the expanding duct on the adjacent separator is staggeredly arranged each other, and intersects mutually.Muffler outlet piper is made up of one group of expanding duct that be arranged in parallel, and the steam outlet pipe suction port seals, and it only has the little hole count of air inlet on that section tube wall of enclosure interior, have several gas buffer holes in the center portion of dividing plate.
Pulsing airflow obtains cushioning when entering first chamber when reducing gas by air inlet aperture hole because the transient drag that pulse was produced of gas is fallen.
Because the expanding duct import that is provided with on the dividing plate seal, air-flow is that the air inlet aperture from the expanding duct tube wall enters in the expanding duct, through expanding duct outlet discharge.Because the expanding duct on the adjacent separator is arranged in a crossed manner, so air-flow wants 180 ° of turnovers to enter next group expanding duct, acoustic attenuation is arranged twice during whenever by one group of expanding duct, once perforated decay, once expansion decay.When therefore air-flow and noise were respectively organized expanding duct by silencing apparatus inside, acoustic wave energy was decayed gradually, reaches more than 24 decibels.The utility model is suitable for following the aerodynamic force very noisy noise reduction work of pulsing airflow.
Be specific embodiment of the utility model below.Accompanying drawing is represented a compact internal combustion engine silencing apparatus sketch drawing.Legend 1 suction tude, 2 chambers, 3 expanding ducts, 4 dividing plates, 5 air inlet apertures, 6 gas buffer holes, 7 housings, 8 outlet pipes.
As shown in the figure, this silencing apparatus is that a hollow housing 7 constitutes, the centre is that two dividing plates 4 are divided into three chamber 2 vertically, three expanding ducts 3 are set on every dividing plate 4, and each expanding duct 3 suction port end face seals, on the tube wall of contiguous this end, have air inlet aperture 5 several, expanding duct 3 exit end faces and its axis are 60 ° of angles, and the Normal direction of this end face is pointed to the inwall of housing 7 parts, and the expanding duct 3 on the adjacent separator 4 is staggeredly arranged each other and intersects mutually.Have gas buffer hole 6 in the center of each dividing plate 4, the outlet pipe 8 of silencing apparatus is made up of one group of expanding duct.Outlet pipe 8 suction ports seal, and one section tube wall in housing 7 has the air inlet aperture.When pulsing airflow and noise, when suction tude 1 pours muffler chamber 2 fast, because the unexpected expansion of the passage of sound wave decays sound wave first, gas is accompanied by noise and enters in the expanding duct 3 from the air inlet aperture 5 of first group of expanding duct 3, discharge from its outlet, noise is because twice expansion of channel cross-section and contraction produce twice decay.Twice decay that also produces sound wave when in like manner air-flow and noise are by next group expanding duct 3.Because outlet pipe 8 is one group of expanding duct, gas also noisy secondary extinction process during through outlet pipe, so gas and noise discharge from outlet pipe 8 by silencing apparatus inside from suction tude 1, noise has passed through seven decay.
Because silencing apparatus is along first chamber volume maximum of airflow direction, it is the buffer of pulsing airflow, have the gas buffer hole in the center portion of every dividing plate 4, therefore reduced pulsing airflow flow through air inlet aperture 5 several the time resistance drop, prevented the instantaneous high-order back pressure that the diesel engine pulsing airflow produces in the noise elimination process.The utility model can be applied in the noise work of all aerodynamic forces.
Claims (2)
1, a kind of combustion air power character silencing apparatus that comprises suction tude 1, housing 7.It is characterized in that the dividing plate 4 in the housing 7 is separated into several chambers 2 vertically with housing 7, dispose several expanding ducts 3 on each dividing plate 4, expanding duct 3 suction ports be sealing and on expanding duct 3 suction port tube walls, have several air inlet apertures 5, the every enterprising gas aperture 5 of expanding duct 3 suction port tube walls is positioned at the same side of these expanding duct 3 place dividing plates, and the exit end face of expanding duct 3 and its axis are 60 ° of angles, expanding duct 3 on the adjacent separator 4 is to be staggeredly arranged each other and to intersect mutually, steam outlet pipe 8 is made up of one group of expanding duct, steam outlet pipe 8 suction ports seal, steam outlet pipe 8 stretch have on one section tube wall in housing 7 air inlet aperture 5 several.
2,, it is characterized in that first chamber is of volume maximum in each chamber by the silencing apparatus of claim 1 regulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198787207078U CN87207078U (en) | 1987-05-20 | 1987-05-20 | Bag with coated binder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198787207078U CN87207078U (en) | 1987-05-20 | 1987-05-20 | Bag with coated binder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87207078U true CN87207078U (en) | 1988-03-09 |
Family
ID=4822560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN198787207078U Withdrawn CN87207078U (en) | 1987-05-20 | 1987-05-20 | Bag with coated binder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87207078U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606268A (en) * | 2012-04-12 | 2012-07-25 | 山东大学 | Reactive muffler for engineering machine |
-
1987
- 1987-05-20 CN CN198787207078U patent/CN87207078U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606268A (en) * | 2012-04-12 | 2012-07-25 | 山东大学 | Reactive muffler for engineering machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2921306Y (en) | Impedance composite noise silencer | |
| CN2809234Y (en) | Exhaust muffler for diesel engine of railway passenger car with air conditioner | |
| CN212716821U (en) | Silencer for exhaust system of gasoline engine | |
| CN87207078U (en) | Bag with coated binder | |
| CN112343689B (en) | Composite muffler with self-adaptive resonance structure | |
| CN2274257Y (en) | Silencer | |
| CN212389932U (en) | Silencer for diffusing pipe | |
| CN211082408U (en) | Microperforated panel combined type silencer | |
| CN209083365U (en) | A kind of Multistage muffler | |
| CN2498518Y (en) | Silenced separated cooker hood | |
| CN2240613Y (en) | Silencer for internal combustion engine | |
| CN208966390U (en) | The composite muffler of large perforation rate | |
| CN2816371Y (en) | IC engine exhausting silencer for automobile | |
| CN217926026U (en) | Silencer of small gasoline mute variable frequency generator set | |
| CN2818804Y (en) | Exhaust silencer of diesel engine of heavy truck | |
| CN218542361U (en) | Single-inlet single-outlet silencer | |
| CN214705422U (en) | Composite silencer of fuel cell engine | |
| CN212680545U (en) | Environmental noise silencer device | |
| CN221032807U (en) | Double-tube exhaust silencing tube of motorcycle | |
| CN216077269U (en) | Folding repeated silencer structure | |
| CN2682211Y (en) | Silencer for perforated pipe | |
| CN217421325U (en) | Large-displacement silencer | |
| CN2296404Y (en) | Low resistance high efficiency silencer | |
| CN2588059Y (en) | Silencer for enginer | |
| CN217152311U (en) | Silencer and compressor assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| 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 |