CN113847119A - Frequency-adjustable silencer - Google Patents
Frequency-adjustable silencer Download PDFInfo
- Publication number
- CN113847119A CN113847119A CN202111195683.7A CN202111195683A CN113847119A CN 113847119 A CN113847119 A CN 113847119A CN 202111195683 A CN202111195683 A CN 202111195683A CN 113847119 A CN113847119 A CN 113847119A
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- expansion
- frequency
- pipe
- cavity
- expansion pipe
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- 230000003584 silencer Effects 0.000 title claims abstract description 22
- 230000008030 elimination Effects 0.000 claims description 10
- 238000003379 elimination reaction Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
- F01N1/166—Silencing apparatus characterised by method of silencing by using movable parts for changing gas flow path through the silencer or for adjusting the dimensions of a chamber or a pipe
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention relates to a frequency-adjustable silencer, which comprises a circular tube-shaped expansion cavity with two closed ends, wherein two ends of the expansion cavity are respectively inserted with an expansion pipe, one end of each expansion pipe is positioned in the expansion cavity, the other end of each expansion pipe is positioned outside the expansion cavity, the expansion pipes are communicated with the expansion cavity and the outside, and the depth of the expansion pipes inserted into the expansion cavities is adjusted according to design. The technology is that the expansion pipe is added on the basis of a single expansion cavity, and the frequency of the silencer is adjusted by adjusting the length of the expansion pipe. The utility model provides a silencer frequency can be adjusted according to the demand, and the design is simple, and occupation space is little, is fit for different platform truck types and borrows.
Description
Technical Field
The invention belongs to the technical field of noise elimination, and particularly relates to a frequency-adjustable silencer.
Background
Consumers are also increasingly demanding on automotive products, not only for power, fuel economy, and safety, but also for importance in the quality of sound in a vehicle. Especially, the existing supercharged vehicle models are more and more common, compared with low-frequency noise, high-frequency noise is more easily captured by customers, and driving feeling is influenced.
At present, for medium-high frequency noise appearing on a whole vehicle, two solutions are mainly provided, one is to design a sound absorption structure in an engine compartment and the interior of the vehicle, such as a method of thickening sound absorption cotton, and the like, the defects of the method are obvious, the reduction of the weight and the cost of the whole vehicle is not facilitated, and the other method is to add a Helmholtz silencer, an 1/4 wavelength tube silencer or a perforated tube silencer to a system.
The scheme of adding the acoustic bag to the whole vehicle is high in cost, the effect cannot be expected, the noise elimination frequency of the Helmholtz silencer is low, the frequency range is small, the noise elimination frequency range of the 1/4-wavelength-tube silencer scheme is slightly high, but the problem of low noise elimination range exists, the noise elimination frequency range of the perforated-tube silencer is limited, and the structures of the silencers are complex.
Disclosure of Invention
The invention aims to provide a frequency-adjustable silencer to solve the problem that the existing silencer for a perforated pipe is limited in sound frequency range.
In order to achieve the purpose, the method is realized by the following technical scheme:
the utility model provides a silencer of adjustable frequency, includes the tubular expansion chamber of both ends confined pipe, respectively inserts an expansion pipe at the both ends in expansion chamber, the one end of expansion pipe is located the expansion intracavity, and the other end of expansion pipe is located outside the expansion chamber, expansion pipe intercommunication expansion chamber and external, the degree of depth that the expansion pipe inserted the expansion chamber is adjusted according to the design.
Furthermore, the expansion device also comprises a power source, wherein a driving part of the power source is connected with the expansion pipe and used for driving one end of the expansion pipe, which is positioned in the expansion cavity, to be inserted into the expansion cavity.
Further, the power source is a motor or a cylinder.
Further, still include controller and noise detection device, noise detection device installs in the car, just noise detection device and controller electricity signal connection, controller and power supply electricity signal connection.
Further, the transmission loss calculation formula of the dilatation cavity is as follows:
when expanding the length of the tube
When D is the inner diameter of the expansion cavity, D is the inner diameter of the expansion pipe, and lambda is the wavelength of sound wave, the transmission loss reaches the maximum, and the corresponding frequency is called as the center frequency.
Further, the central frequency calculation formula is as follows:
The invention has the beneficial effects that:
the technology is that the expansion pipe is added on the basis of a single expansion cavity, and the frequency of the silencer is adjusted by adjusting the length of the expansion pipe. The utility model provides a silencer frequency can be adjusted according to the demand, and the design is simple, and occupation space is little, is fit for different platform truck types and borrows.
Drawings
FIG. 1 is a schematic view of a frequency tunable muffler according to the present invention.
Description of the reference numerals
1. An expansion cavity 2 and an expansion pipe.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.
The technology is that the expansion pipe is added on the basis of a single expansion cavity, and the frequency of the silencer is adjusted by adjusting the length of the expansion pipe.
As shown in figure 1, the application provides a frequency adjustable silencer, including the both ends confined pipe-shaped expansion chamber 1, respectively insert an expansion pipe 2 at the both ends in expansion chamber, the one end of expansion pipe is located the expansion intracavity, and the other end of expansion pipe is located outside the expansion chamber, expansion pipe intercommunication expansion chamber and external, the degree of depth that the expansion pipe inserted the expansion chamber is adjusted according to the design.
One expansion cavity can eliminate a narrow-band frequency noise peak value, and the length of the expansion pipe can be designed according to specific noise elimination requirements on the basis of the original noise elimination frequency of the expansion cavity through interpolation.
The transmission loss calculation formula of the dilatation cavity is as follows:
when expanding the length of the tube
When D is the inner diameter of the expansion cavity, D is the inner diameter of the expansion pipe, and lambda is the wavelength of sound wave, the transmission loss reaches the maximum, and the corresponding frequency is called as the center frequency.
The central frequency calculation formula is as follows:
In other embodiments of the present application, the vehicle-mounted noise monitor may further include a power source, a controller, and a squeak detection device, wherein the power source is a motor or a cylinder, and a driving portion of the power source is connected to the expansion tube for driving one end of the expansion tube located in the expansion cavity to be inserted into the expansion cavity, so as to perform corresponding adjustment according to an actual situation of noise in the vehicle.
And, can be according to actual detection, insert the expansion pipe in the different degree of depth can subdue the frequency of noise and gather in the controller, and save in the controller, or compile corresponding control mode according to gathering, noise detection device in the car is used for detecting instant noise to transmit the noise signal who detects for the controller, the controller is compared with the summary data of the expansion pipe length of inserting in the expansion intracavity that the controller was stored according to the data that detect, after looking for corresponding data, control motor or cylinder drive expansion pipe move, make the expansion pipe insert the settlement length in the expansion intracavity.
The frequency of the silencer can be adjusted from 800HZ to 2400HZ, the silencer is simple in structure and small in occupied space, and if the silencing frequency is not in the range, the frequency can be adjusted by adjusting the expansion cavity.
Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a silencer of adjustable frequency, includes the tubular expansion chamber of both ends confined pipe, respectively inserts an expansion pipe at the both ends in expansion chamber, the one end of expansion pipe is located the expansion intracavity, and the other end of expansion pipe is located outside the expansion chamber, the expansion pipe intercommunication expansion chamber and external, its characterized in that, the degree of depth that the expansion pipe inserted the expansion chamber is adjusted according to the design.
2. The muffler with adjustable frequency according to claim 1, further comprising a power source, wherein a driving portion of the power source is connected to the expanding tube for driving an end of the expanding tube located in the expanding cavity to be inserted into the expanding cavity.
3. The tunable frequency muffler of claim 2, wherein the power source is a motor or a cylinder.
4. The tunable muffler according to claim 2, further comprising a controller and a noise detection device, wherein the noise detection device is installed in the vehicle and electrically connected to the controller, and the controller is electrically connected to the power source.
5. The frequency tunable muffler of claim 1, wherein the propagation loss of the expansion chamber is calculated by the formula:
when expanding the length of the tube
When D is the inner diameter of the expansion cavity, D is the inner diameter of the expansion pipe, and lambda is the wavelength of sound wave, the transmission loss reaches the maximum, and the corresponding frequency is called as the center frequency.
6. The frequency tunable muffler of claim 5, wherein the center frequency calculation formula is:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111195683.7A CN113847119A (en) | 2021-10-14 | 2021-10-14 | Frequency-adjustable silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111195683.7A CN113847119A (en) | 2021-10-14 | 2021-10-14 | Frequency-adjustable silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113847119A true CN113847119A (en) | 2021-12-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111195683.7A Pending CN113847119A (en) | 2021-10-14 | 2021-10-14 | Frequency-adjustable silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113847119A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114811251A (en) * | 2022-02-25 | 2022-07-29 | 中国船舶重工集团公司第七一九研究所 | Silencer control method and device, electronic equipment and silencer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2449141A1 (en) * | 2002-12-06 | 2004-06-06 | Honda Motor Co., Ltd. | Exhaust silencer for internal combustion engine |
| US20120312629A1 (en) * | 2011-06-13 | 2012-12-13 | King Fahd University Of Petroleum And Minerals | Expandable chamber acoustic silencer |
| CN203549259U (en) * | 2013-09-30 | 2014-04-16 | 同济大学 | Frequency-adjustable micro-perforated pipe muffler with variable-volume expanding cavity |
| CN203604904U (en) * | 2013-12-05 | 2014-05-21 | 同济大学 | Micro perforated pipe silencer with adjustable frequency |
| CN204553014U (en) * | 2015-03-11 | 2015-08-12 | 奇瑞汽车股份有限公司 | A kind of intake silencer |
| CN110630352A (en) * | 2019-11-21 | 2019-12-31 | 潍柴动力股份有限公司 | Silencer and engine with same |
-
2021
- 2021-10-14 CN CN202111195683.7A patent/CN113847119A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2449141A1 (en) * | 2002-12-06 | 2004-06-06 | Honda Motor Co., Ltd. | Exhaust silencer for internal combustion engine |
| US20120312629A1 (en) * | 2011-06-13 | 2012-12-13 | King Fahd University Of Petroleum And Minerals | Expandable chamber acoustic silencer |
| CN203549259U (en) * | 2013-09-30 | 2014-04-16 | 同济大学 | Frequency-adjustable micro-perforated pipe muffler with variable-volume expanding cavity |
| CN203604904U (en) * | 2013-12-05 | 2014-05-21 | 同济大学 | Micro perforated pipe silencer with adjustable frequency |
| CN204553014U (en) * | 2015-03-11 | 2015-08-12 | 奇瑞汽车股份有限公司 | A kind of intake silencer |
| CN110630352A (en) * | 2019-11-21 | 2019-12-31 | 潍柴动力股份有限公司 | Silencer and engine with same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114811251A (en) * | 2022-02-25 | 2022-07-29 | 中国船舶重工集团公司第七一九研究所 | Silencer control method and device, electronic equipment and silencer |
| CN114811251B (en) * | 2022-02-25 | 2023-08-25 | 中国船舶重工集团公司第七一九研究所 | Muffler control method and device, electronic equipment and muffler |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211228 |