CN2521401Y - Diesel engine frequency shift noise silencer - Google Patents
Diesel engine frequency shift noise silencer Download PDFInfo
- Publication number
- CN2521401Y CN2521401Y CN 02219138 CN02219138U CN2521401Y CN 2521401 Y CN2521401 Y CN 2521401Y CN 02219138 CN02219138 CN 02219138 CN 02219138 U CN02219138 U CN 02219138U CN 2521401 Y CN2521401 Y CN 2521401Y
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- China
- Prior art keywords
- frequency
- silencer
- noise
- shift frequency
- housing
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Abstract
The utility model discloses a frequency-shift silencer of a self-ignition engine, comprising an outer casing, a frequency-shift silencer device, an inner-inserting pipe and a resonant barrel. The front end and the rear end of the outer casing are respectively arranged with an air-inlet and an air-outlet. A separating baffle is arranged in the outer casing, and through-holes are arranged on the separating baffle. The frequency-shift silencer device is arranged in a front cavity of the outer casing and is in relative connection to the air-inlet. The resonant barrel is arranged in the rear cavity of the outer casing, and a blind plate is arranged in the resonant barrel. One end of the inner-inserting pipe is fixed on the separating baffle and is communicated with the through-holes arranged on the separating baffle, and the other end is inserted into the resonant barrel. Inner walls of the outer casing are provided with a fire-resistant acoustic device which is composed of fire-resistant acoustic materials and a supporting frame. The frequency-shift silencer device is a tubular structure, the bottom portion of the device is a blind hole, and side walls are arrayed with through-holes. Compared with the existing technology, the utility model has the obvious advantages of high sound deadening capacity which can reach more than 40 d B (A).
Description
One, technical field
The utility model relates to a kind of silencer, particularly a kind of diesel engine shift frequency silencing apparatus.
Two, background technique
Diesel engine, diesel generator and the machinery relief opening noise that is used as power with diesel engine are very high, and the sound level at its 1 meter is about 115dB (A), and manufacturer often increases a reactive muffler on relief opening, make this noise drop to 105dB (A).But these equipment are installed on after the fixed location, and its running noises often seriously exceeds Standard of Environmental Noise and factory circle noise standard, and the main cause that exceeds standard is exactly that the relief opening noise is too big.Be the acoustic environment around the protection equipment, use producer before these strong noise equipment use, to take various noise control measure, as absorb sound, insulate against sound, noise elimination, vibration damping handle, comprise adding resistive or reactive muffler.After cost many human and material resources and financial resources, often find that the relief opening noise is still higher because add silencing apparatus sound deadening capacity can not reach the requirement of Standard of Environmental Noise.
Control the method that pneumatic noise mainly takes to add silencing apparatus at present both at home and abroad, the kind and the structural type of silencing apparatus are a lot, but mainly contain dissipative muffler and reactive muffler two big classes by its noise-cancelling theory.
Dissipative muffler be with porous material as sound absorbent, allow the strong noise air-flow pass through, thereby sponge the noise energy in the air-flow near the sound absorbent.This silencing apparatus is better to high-frequency air flow noise noise reduction, but relatively poor to the pneumatic noise effect of low frequency.The structure difference of silencing apparatus, its sound deadening capacity differs greatly, and general dissipative muffler can reduce pneumatic noise 10-25dB (A).
Reactive muffler is sudden change or methods such as design resonant cavity, arm of utilizing the airflow line cross section, make the acoustic impedance of sound bearing medium discontinuous, thereby the sound wave that causes some frequency in the air-flow produces reflection, interferes, resonates, and consumes noise energy in a large number, reaches the purpose that reduces pneumatic noise.This silencing apparatus can remedy the defective of dissipative muffler to the low-frequency noise weak effect, but what be primarily aimed at because of it is the noise of the several frequencies of low-frequency range, so total sound deadening capacity is less, and drag losses is relatively large.Though improved reactive muffler has been expanded the frequency bandwidth of eliminating the noise, its sound deadening capacity generally also has only about 10dB (A).
Three, summary of the invention
1, goal of the invention: a kind ofly effectively hang down the silencer of diesel exhaust gas mouth noise pollution by changing the pneumatic noise frequency thereby the purpose of this utility model provides with falling.
2, technological scheme: for achieving the above object, diesel engine shift frequency silencing apparatus described in the utility model, it is characterized in that it comprises housing, the shift frequency silencer, interpolation pipe and resonance cylindrical shell, be respectively equipped with suction port and relief opening in the front end and back end of housing, in housing, be provided with demarcation strip, on demarcation strip, be provided with through hole, the shift frequency silencer places in the interior preceding cavity of housing, and be fixed on the suction port place, the resonance cylindrical shell is installed in the interior rear chamber of housing, be provided with a blind plate in resonance in the cylindrical shell, interpolation pipe one end is fixed on the demarcation strip and communicates with through hole on the demarcation strip, and the other end inserts in the resonance cylindrical shell.
The inwall of described housing is provided with the high-temperature resistant sound absorption device.
Described sound absorber is made of high-temperature resistant sound absorption material and support frame.
Described shift frequency silencer is a tubular structure, and its bottom is a blind hole, and sidewall is distributed with through hole.
The utility model mainly is made up of two-part, and first portion is the device that improves the pneumatic noise frequency, and second portion is a silencer.Its noise-cancelling theory and working procedure and traditional resistive and reactive muffler differ greatly, it is not directly to receive the noise that relief opening comes out passively to be eliminated, but at first change the pneumatic noise frequency, original medium and low frequency noise is changed into high frequency, ultra-high frequency noise, and then further take the noise elimination treatment measures of resistive or resistance.
The strong noise air-flow enters silencing apparatus and at first by the shift frequency silencer original noise frequency is improved greatly later.This treatment process can play the noise elimination effect of two aspects, first owing to improved the noise frequency in the air-flow, make the noise of a part of frequency enter into the insensitive zone of people's ear, the noise of another part higher frequency has exceeded the audible sound scope, people's basal part of the ear originally be can't hear, thereby has reduced A-weighted sound level; Second because noise frequency has improved, for the noise reduction of back device has been created advantage.The shift frequency silencer needs the certain gas delivery pressure of loss, greatly about 10-15mmH
2Between the O.
The silencer of second portion is further eliminated the high-frequency noise in the air-flow, reason according to the high more easy more elimination of frequency of sound wave, the silencer noise reduction of second portion is improved, even changes airflow direction, also can eliminate several decibels of noises.Consider the grit after there is burning in the diesel exhaust gas mouth, this silencing apparatus has been taked the impedance complex sound reduction method, based on reactive muffling.
Working procedure of the present utility model is that the gas of combustion that diesel engine produces enters the shift frequency silencer by the silencing apparatus suction port, and the shift frequency silencer has also reduced the acoustic energy of audible sound when noise frequency is improved.Enter expansion chamber from moving the air-flow that becomes after silencer comes out, make the speed of air-flow obtain reduction, noise energy is also absorbed by sound absorbent in a large number in this chamber, and air-flow enters resonant cavity by interpolation pipe then, and the noise energy in the air-flow by a large amount of reflections later.Air-flow enters the annular pass between resonance cylindrical shell and the sound absorbent through 360 ° of turnings then, and noise is absorbed by sound absorbent again in this passage.After air-flow enters last resonant cavity resonant silencing, discharged by the silencing apparatus relief opening, the pneumatic noise of this moment has reduced more than the 40dB (A).If needing pipeline to connect away, the back is connected with outlet(discharge) flange, otherwise directly emptying.
3, beneficial effect: the utility model compared with prior art.Its remarkable advantage is the sound deadening capacity height, this shift frequency silencing apparatus sound deadening capacity can reach more than the 40dB (A), the shift frequency silencing apparatus theoretical calculation sound deadening capacity that produces CF186 diesel generator relief opening parameter designing according to Italy is that (wherein frequency displacement noise reduction is 11dB (A) to 50dB (A), the first expansion sound deadening capacity is 12.8dB (A), the second expansion chamber sound deadening capacity is 7.2dB (A), resistance noise reduction amount 19dB (A)), can't hear aerodynamic noise at relief opening during actual tests.
Silencing apparatus will consume some power when carrying out frequency translation, so its drag losses is bigger than general silencing apparatus, but can be controlled at 15-25mmH
2Between the O, this is complete acceptable for the back pressure of diesel engine and compressor air-discharging system.
According to the watt level of diesel engine and institute's waste discharge tolerance what, supporting shift frequency silencing apparatus diameter is different with length, producing the CF186 diesel generator with Italy is example, supporting shift frequency silencing apparatus is of a size of Φ 1000 * 2360.Acoustic wave filter structure is than the conventional muffler complexity, but still processing easily, cost is not high yet.If consider that silencing apparatus is antirust, adopt stainless steel materials to make, then difficulty of processing is big, and cost is also higher.
Four, description of drawings
Accompanying drawing is the utility model structural representation.
Wherein: the 1-housing; 2-shift frequency silencer; The 3-interpolation pipe; The 4-cylindrical shell that resonates; The 5-suction port; The 6-relief opening; The 7-demarcation strip; The 8-blind plate; The 9-sound absorber.
Five, preferred forms
The diesel engine shift frequency silencing apparatus that the utility model is made comprises housing 1, shift frequency silencer 2, interpolation pipe 3, resonance cylindrical shell 4, suction port 5, relief opening 6, demarcation strip 7, blind plate 8 and sound absorber 9.Housing 1 is a cylindrical structure, its length is 2200mm, diameter is 1000mm, suction port 5 is arranged on the front end of housing 1, relief opening 6 is arranged on the rear end of housing 1, in the centre of housing 1 demarcation strip 7 is set, and makes the cavity in the housing 1 be separated into preceding cavity and rear chamber, be provided with the through hole that a diameter is 250mm at the center of demarcation strip 7, the front and back cavity in the housing 1 is communicated.Shift frequency silencer 2 is a cylindrical structure, and its bottom is a blind hole, and diameter is 250mm, and length is 800mm, is distributed with many little vents on its sidewall, and the mouth end of shift frequency silencer 2 is docked at the oral area of suction port 5, and the bottom extend in the preceding cavity of housing 1.Resonance cylindrical shell 4 is fixed in the rear chamber of housing 1, and its diameter is 680mm, and length is 800mm, is provided with a blind plate 8 in resonance cylindrical shell 4, makes resonance cylindrical shell 4 form former and later two resonant cavities.Interpolation pipe 3 one ends are docked on the through hole of demarcation strip 7, and the other end extend in the preceding resonant cavity of resonance cylindrical shell 4.On the cavity inner wall of the front and back of housing 1, be provided with sound absorber 9, this sound absorber 9 by the high-temperature resistant sound absorption material and fixedly the support frame of sound-absorbing material constitute.
Claims (4)
1, a kind of diesel engine shift frequency silencing apparatus, it is characterized in that it comprises housing (1), shift frequency silencer (2), interpolation pipe (3) and resonance cylindrical shell (4), be respectively equipped with suction port (5) and relief opening (6) in the front end and back end of housing (1), in housing (1), be provided with demarcation strip (7), on demarcation strip (7), be provided with through hole, shift frequency silencer (2) places in the interior preceding cavity of housing (1), and be docked at suction port (5) and locate, resonance cylindrical shell (4) is installed in the interior rear chamber of housing (1), in resonance cylindrical shell (4), be provided with a blind plate (8), interpolation pipe (3) one ends are fixed on that demarcation strip (7) is gone up and communicate with through hole on the demarcation strip, and the other end inserts in the resonance cylindrical shell (4).
2, diesel engine shift frequency silencing apparatus according to claim 1 is characterized in that being provided with high-temperature resistant sound absorption device (9) on the inwall of described housing (1).
3, diesel engine shift frequency silencing apparatus according to claim 2 is characterized in that described sound absorber (9) is made of high-temperature resistant sound absorption material and support frame.
4, diesel engine shift frequency silencing apparatus according to claim 1 and 2 is characterized in that described shift frequency silencer (2) is a tubular structure, and its bottom is a blind hole, and sidewall is distributed with through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02219138 CN2521401Y (en) | 2002-03-05 | 2002-03-05 | Diesel engine frequency shift noise silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02219138 CN2521401Y (en) | 2002-03-05 | 2002-03-05 | Diesel engine frequency shift noise silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2521401Y true CN2521401Y (en) | 2002-11-20 |
Family
ID=33697667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02219138 Expired - Fee Related CN2521401Y (en) | 2002-03-05 | 2002-03-05 | Diesel engine frequency shift noise silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2521401Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252768A (en) * | 2018-03-19 | 2018-07-06 | 浙江师范大学 | A kind of magnetic rheology elastic body active moves sound-absorbing muffler |
-
2002
- 2002-03-05 CN CN 02219138 patent/CN2521401Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252768A (en) * | 2018-03-19 | 2018-07-06 | 浙江师范大学 | A kind of magnetic rheology elastic body active moves sound-absorbing muffler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |