CN214944649U - Broadband noise reduction air filter - Google Patents
Broadband noise reduction air filter Download PDFInfo
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- CN214944649U CN214944649U CN202120387740.0U CN202120387740U CN214944649U CN 214944649 U CN214944649 U CN 214944649U CN 202120387740 U CN202120387740 U CN 202120387740U CN 214944649 U CN214944649 U CN 214944649U
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- silencing
- silencing pipe
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- pipe section
- pipe
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- Exhaust Silencers (AREA)
Abstract
The utility model relates to an empty filter of making an uproar falls in wide band, including last casing, the lower casing of being connected with last casing, establish the empty filter core between last casing and lower casing upward be equipped with the gas outlet on the casing be equipped with air inlet, characterized by down on the casing: the embedded silencing pipe is formed by connecting a first silencing pipe section and a second silencing pipe section, and the air inlet end of the first silencing pipe section is communicated with the air inlet in the lower shell. The utility model can effectively reduce the noise of the air inlet part and has wide noise elimination frequency band; the structure is compact, extra cabin space is not occupied, and the installation cost can be reduced.
Description
Technical Field
The utility model relates to an engine air intake system especially relates to an empty filter of making an uproar falls in wide band.
Background
The noise of the automobile has become one of the important indexes of the customer on the overall impression and evaluation of the automobile at present, and how to reduce the noise of the automobile and improve the sound quality is an important subject of the technical development of the automobile at present, and the noise of the automobile is widely regarded by various automobile manufacturing enterprises.
The noise of the air intake system mainly refers to the noise at the air inlet of the engine, and the noise of the air intake system is the main noise source of the noise in the automobile and is also the main noise source of the passing noise of the automobile. The reduction of the intake noise of the engine is generally controlled by an air filter and an intake bypass muffler element.
At present, most of intake side branch silencing elements on automobiles are arranged on a pipeline connected with an air filter, and for example, helmholtz resonance type silencers, 1/2 wave tubes and the like are used for silencing and reducing noise. The arrangement of the sound-damping elements commonly used in automobiles still has some problems, such as: the installation cost is increased by installing the silencing element on the air inlet pipeline, the silencing frequency band of the existing silencing element structure is limited, the arrangement space of the silencing element is insufficient, the arrangement of the silencing element influences the attractiveness, and the like.
Therefore, how to provide an air filter structure, which can greatly improve the noise reduction of the broadband frequency domain of the air intake system, and can also solve the problem that the arrangement space of the related noise elimination element of the air intake system is insufficient and not attractive, is a technical problem to be solved by those skilled in the art.
CN201250731Y discloses a multi-cavity noise reduction air filter, which comprises an air filter body and a resonance cavity, wherein the air filter body consists of an upper shell, a lower shell and a filter element arranged between the upper shell and the lower shell, an air outlet is formed in the upper shell, and an air inlet is formed in the lower shell; the lower part of the lower shell is divided into a resonance chamber by a partition plate, the resonance chamber is communicated with the upper space of the lower shell through a through hole or a conduit, and the air inlet is formed in the upper space of the lower shell. The resonant cavity is arranged in the air filter body, so that the noise of an air inlet of an engine is effectively reduced, the resonance control quantity of the air filter is reduced, the NVH performance of the whole vehicle is improved by a smooth noise curve, and the air filter has the advantages of convenience in assembly, attractive appearance and arrangement space saving. The technical solution disclosed in this patent document is, of course, a useful attempt in the technical field.
Disclosure of Invention
The utility model aims at providing a broadband noise reduction air filter structure which can effectively reduce the noise of an air inlet part and has wide noise elimination frequency band; the structure is compact, extra cabin space is not occupied, and the installation cost can be reduced.
A wide band falls empty filter of making an uproar, including last casing, the lower casing of being connected with last casing, establish the empty filter core between last casing and lower casing upward be equipped with the gas outlet on the casing be equipped with air inlet, characterized by down on the casing: the embedded silencing pipe is formed by connecting a first silencing pipe section and a second silencing pipe section, and the air inlet end of the first silencing pipe section is communicated with the air inlet in the lower shell.
Furthermore, the first silencing pipe section of the embedded silencing pipe is of a double-layer pipe wall structure, and a spiral plate is arranged between the inner layer pipe wall and the outer layer pipe wall of the embedded silencing pipe to form an 1/2 wavelength pipe section.
Furthermore, a second silencing pipe section of the embedded silencing pipe is also of a double-layer pipe wall structure, and a plurality of silencing small holes are formed in the inner-layer pipe wall of the embedded silencing pipe to form a high-frequency resonant cavity section.
Further, the cross section of the second sound attenuation pipe section is larger than the cross section of the first sound attenuation pipe section.
Further, the cross sections of the first sound attenuation pipe section and the second sound attenuation pipe section are circular or elliptical.
Compared with the prior art, the utility model has the following advantage:
because the embedded silencing pipe is adopted, the structure is compact, and extra cabin space is not required to be occupied;
because embedded muffler pipe is bilayer structure, comprises two sections series connection, wherein: a spiral plate is arranged between a section of double-layer pipe and the pipe to form an 1/2 wave pipe, so that medium-high frequency noise generated by an engine and medium-high frequency radiation noise (500-1500 Hz) caused by high-speed airflow can be eliminated, and compared with the traditional structure, the structure has wider noise elimination frequency band; the double-layer pipe of the other section of the silencing pipe and a plurality of small holes on the inner pipe wall form a high-frequency resonant cavity, so that medium-high frequency noise generated by an engine and high-frequency radiation noise (1500-; the advantages of the 1/2 wave pipe and the high-frequency resonance cavity are fully combined, so that the noise of the air inlet system can be effectively inhibited, and the quality of air inlet sound is improved; in addition, the reasonable application of the structure can replace 1/2 wavelength tubes and resonant cavities in the prior art, and the cost is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the internal structure of the lower casing of the present invention;
fig. 3 is a schematic structural view of the muffling tube of the present invention.
In the figure:
1-upper shell, 11-air outlet;
2-lower housing, 21-air inlet;
3-air filter element;
4-embedded silencing pipe, 41-first silencing pipe section, 42-second silencing pipe section, 43-helical plate, 44-silencing small hole.
Detailed Description
The present invention will be described in detail with reference to the following drawings and examples:
referring to fig. 1, 2 and 3, the broadband noise reduction air filter includes an upper casing 1, a lower casing 2 connected to the upper casing, and an air filter element 3 disposed between the upper casing and the lower casing, wherein an air outlet 11 is disposed on the upper casing 1, and an air inlet 21 is disposed on the lower casing 2, and is characterized in that: an embedded silencing pipe 4 is arranged in the lower shell 2, the embedded silencing pipe 4 is formed by connecting a first silencing pipe section 41 and a second silencing pipe section 42, and the air inlet end of the first silencing pipe section 41 is communicated with the air inlet 21 on the lower shell 2. The embedded silencing pipe is arranged in the lower shell, so that extra cabin space is not occupied, and the structure is more compact.
The first silencing pipe section 41 of the embedded silencing pipe 4 is of a double-layer pipe wall structure, and a spiral plate 43 is arranged between the inner layer pipe wall and the outer layer pipe wall of the embedded silencing pipe to form an 1/2 wavelength pipe section; so as to eliminate the medium-high frequency noise generated by the engine and the medium-high frequency radiation noise with the frequency in the range of 500-1500Hz caused by high-speed airflow.
The second silencing pipe section 42 of the embedded silencing pipe 4 is also of a double-layer pipe wall structure, and a plurality of silencing small holes 44 are formed in the inner pipe wall of the embedded silencing pipe to form a high-frequency resonant cavity section; so as to eliminate the medium-high frequency noise caused by the engine and the medium-high frequency radiation noise with the frequency in the range of 1500-4000Hz caused by the high-speed airflow.
The cross-section of the second sound attenuation tube section 42 is larger than the cross-section of the first sound attenuation tube section 41.
The first sound attenuation pipe section 41 and the second sound attenuation pipe section 42 have a circular or elliptical cross section.
The length of the embedded silencing pipe is designed according to the size of the shell of the air filter and the frequency band of noise to be eliminated; the distance between the inner wall and the outer wall of the first silencing pipe section of the embedded silencing pipe, the length of the spiral section and the screw pitch of the spiral plate can be designed according to the frequency band for eliminating noise; the distance between the inner wall and the outer wall of the second silencing pipe section (resonant cavity section) of the embedded silencing pipe and the number, positions and diameters of the holes of the silencing small holes in the inner wall can be designed according to the frequency band of the noise to be eliminated.
The utility model fully combines the advantages of 1/2 wavelength tubes and resonant cavities, can greatly improve the noise reduction of the broadband frequency domain of the air inlet system, and improve the quality of air inlet sound; and simultaneously, the utility model provides an embedded muffler structure, compact structure need not occupy extra cabin space. In addition, the application of the structure can reduce the cost.
Claims (5)
1. The utility model provides an empty filter of making an uproar falls in wide band, includes last casing (1), lower casing (2) of being connected with last casing, establishes empty filter core (3) between last casing and lower casing be equipped with gas outlet (11) on last casing (1) be equipped with air inlet (21), characterized by on casing (2) down: an embedded silencing pipe (4) is arranged in the lower shell (2), the embedded silencing pipe (4) is formed by connecting a first silencing pipe section (41) and a second silencing pipe section (42), and the air inlet end of the first silencing pipe section (41) is communicated with an air inlet (21) in the lower shell (2).
2. The broadband noise reducing air filter according to claim 1, wherein: the first silencing pipe section (41) of the embedded silencing pipe (4) is of a double-layer pipe wall structure, and a spiral plate (43) is arranged between the inner layer pipe wall and the outer layer pipe wall of the embedded silencing pipe to form an 1/2 wavelength pipe section.
3. The broadband noise reduction air filter according to claim 1 or 2, wherein: the second silencing pipe section (42) of the embedded silencing pipe (4) is also of a double-layer pipe wall structure, and a plurality of silencing small holes (44) are formed in the inner-layer pipe wall of the embedded silencing pipe to form a high-frequency resonant cavity section.
4. The broadband noise reduction air filter according to claim 1 or 2, wherein: the cross section of the second sound-damping pipe section (42) is larger than the cross section of the first sound-damping pipe section (41).
5. The broadband noise reduction air filter according to claim 1 or 2, wherein: the cross sections of the first silencing pipe section (41) and the second silencing pipe section (42) are circular or elliptical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120387740.0U CN214944649U (en) | 2021-02-22 | 2021-02-22 | Broadband noise reduction air filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120387740.0U CN214944649U (en) | 2021-02-22 | 2021-02-22 | Broadband noise reduction air filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214944649U true CN214944649U (en) | 2021-11-30 |
Family
ID=79098299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120387740.0U Active CN214944649U (en) | 2021-02-22 | 2021-02-22 | Broadband noise reduction air filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214944649U (en) |
-
2021
- 2021-02-22 CN CN202120387740.0U patent/CN214944649U/en active Active
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