CN210178492U - Resistant empty filter of eliminating noise - Google Patents
Resistant empty filter of eliminating noise Download PDFInfo
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- CN210178492U CN210178492U CN201920782405.3U CN201920782405U CN210178492U CN 210178492 U CN210178492 U CN 210178492U CN 201920782405 U CN201920782405 U CN 201920782405U CN 210178492 U CN210178492 U CN 210178492U
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- pipe
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- 230000008030 elimination Effects 0.000 claims abstract description 26
- 238000003379 elimination reaction Methods 0.000 claims abstract description 26
- 229920000742 Cotton Polymers 0.000 claims abstract description 23
- 238000010521 absorption reaction Methods 0.000 claims abstract description 16
- 230000030279 gene silencing Effects 0.000 claims description 45
- 238000005192 partition Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000006978 adaptation Effects 0.000 abstract description 4
- 230000003584 silencer Effects 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 description 8
- 238000001228 spectrum Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000001743 silencing effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The utility model provides an empty filter of resistance noise elimination, this empty filter of resistance noise elimination includes anechoic chamber, resonant cavity, filter chamber, muffler pipe and filter core, the anechoic chamber is equipped with the air inlet, the muffler pipe passes the anechoic chamber and stretches into in the resonant cavity by the air inlet; the resonant cavity is separated from the filter cavity by the filter element, and the filter cavity is provided with an air outlet; the sound absorption cotton is placed in the sound absorption cavity, and a plurality of air dissipation through holes are formed in the part, located in the sound absorption cavity, of the sound absorption pipe. The utility model discloses inside integrated to empty filter with numerous and diverse noise elimination component, simplified air intake system, whole car air intake system need not additionally to arrange silencer spare part, saves great layout space for engine compartment, has compact structure, noise elimination effect is good, the noise elimination frequency band is wide, the timing space is big, advantage such as with low costs to the timing and the adaptation that carry out noise elimination effect such as the scattered gas through-hole aperture of accessible adjustment noise elimination cotton density, muffler pipe agree with different engines and whole car.
Description
Technical Field
The utility model relates to an automobile parts technical field, concretely relates to design configuration optimization of empty filter of diesel locomotive.
Background
The air filter is widely applied to the field of air inlet systems of internal combustion engines and automobiles at present, and the structure of the air filter generally comprises an upper plastic shell, a lower plastic shell and a filter element body, so that the function of filtering gas impurities can be realized. The air filter has a certain silencing function, but the silencing frequency band is narrow, the adjusting space is small, and the purpose of inhibiting the air inlet noise of the engine can be achieved only by adding an additional silencer in an air inlet system. At present, the air filter in the automobile industry has the disadvantages of unadjustable structure, difficulty in noise adjustment, longer period, higher cost and low generalization degree, and different mufflers need to be additionally adapted when being matched with different engines and finished automobiles.
Disclosure of Invention
The utility model aims at providing an empty filter of hindering nature noise elimination that compact structure, noise elimination are effectual, the noise elimination frequency band is wide, the timing space is big, with low costs.
The utility model discloses an empty filter of hindering nature noise elimination includes anechoic chamber, resonant cavity, filter chamber, muffler pipe and filter core, the anechoic chamber is equipped with the air inlet, the muffler pipe passes the anechoic chamber and stretches into in the resonant cavity by the air inlet; the resonant cavity is separated from the filter cavity by the filter element, and the filter cavity is provided with an air outlet; the sound absorption cotton is placed in the sound absorption cavity, and a plurality of air dissipation through holes are formed in the part, located in the sound absorption cavity, of the sound absorption pipe.
The working principle of the resistive silencing air filter is as follows:
external fresh air enters the silencing pipe from the air inlet and flows along the silencing pipe, part of air enters the silencing cavity from the air dispersing through hole of the silencing pipe, when the part of air flow is in contact with the silencing cotton, the silencing cotton generates vibration and generates heat energy due to friction and viscosity, noise is absorbed and converted in the process, the structure mainly absorbs medium-high frequency sound waves, and the main silencing frequency band is about 300-1000 Hz. The noise elimination principle is based on the frequency spectrum of jet noise, if the total area of the air dispersion through holes is kept unchanged and a plurality of small air dispersion through holes are used for replacing the air dispersion through holes, when air flow passes through the small air dispersion through holes, the frequency spectrum of the jet noise is shifted to high frequency or ultrahigh frequency, so that the audible sound component in the frequency spectrum is obviously reduced. Meanwhile, part of low-frequency pulse order noise can be converted into medium-frequency sound waves after being diffused through the small air-diffusing through holes, and the medium-frequency sound waves enter the sound-absorbing cavity and are absorbed by the sound-absorbing cotton. In the later adaptation and adjustment process, engineers can adjust the aperture and the number of the air-diffusing through holes to change the noise elimination frequency band and the noise insulation amount, so that the aim of meeting the NVH adjustment and adjustment requirements of different engines and the whole vehicle is fulfilled.
The other part of the airflow directly enters the resonant cavity from the muffling pipe, and because the cross section area of the airflow is suddenly changed, an expansion effect is generated, noise is reflected and overlapped in the resonant cavity, and the purpose of muffling is achieved, wherein the larger the expansion ratio (the cross section area of the cavity/the cross section area of the muffling pipe) is, the better the muffling effect is, meanwhile, the larger the capacity is, the airflow can be stabilized, and the pulse noise is reduced.
Then the airflow passes through the filter element and enters the filter cavity to achieve the purpose of filtering impurities; and finally, the airflow flows out of the air outlet of the filter cavity and then enters the engine.
In order to improve the silencing effect, the sound-absorbing cotton is in close contact with the silencing pipe, and the air-dispersing through holes are uniformly distributed at the pipe body of the silencing pipe.
Specifically, the resistive silencing air filter comprises a shell consisting of an upper shell and a lower shell, wherein a silencing cavity and a resonant filter cavity are formed in the shell through vertical partition plates; the filter element is clamped between the upper shell and the lower shell so as to separate the resonant filter cavity into the resonant cavity and the filter cavity.
For convenient installation, the muffler pipe comprises a pipe body and a flange plate arranged on the outer wall of the pipe body, and the muffler pipe is fixedly connected with the lower shell by using bolts penetrating through the flange plate and the lower shell.
Further, the outer wall of casing is equipped with the mounting bracket, the mounting bracket is equipped with fixed orifices and rubber damping pad to keep apart the vibration between empty filter and the automobile body, the empty filter of protection.
The utility model provides an inside air filter is integrated to air filter with numerous and diverse noise elimination component to the air filter to hindering nature noise elimination, air intake system has been simplified, whole car air intake system need not additionally to arrange silencer spare part, save great arrangement space for the engine compartment, have compact structure, noise elimination effect is good, the noise elimination frequency band is wide, the timing space is big, advantages such as with low costs, and the cotton density of accessible adjustment noise elimination, the scattered gas through-hole aperture of muffler pipe etc. carry out noise elimination's timing and adaptation, agree with different engines and whole car.
Drawings
Fig. 1 is an isometric view of a resistive muffler of the present invention.
Fig. 2 is the assembly structure schematic diagram of the resistive muffler of the present invention.
Fig. 3 is an isometric view of the muffler pipe of the present invention.
Fig. 4 is an isometric view of the sound-absorbing cotton of the present invention.
Fig. 5 is an isometric view of a lower housing of the present invention.
The figures are numbered: 1. an upper housing; 2. a lower housing; 21. a mounting frame; 22. a vibration damping pad; 3. a seal ring; 4. a partition plate; 5. an anechoic chamber; 6. a filter element; 7. a resonant cavity; 8. an air outlet; 9. a muffler pipe; 91. an air-diffusing through hole; 92. a flange plate; 10. sound-absorbing cotton; 101. a groove; 11. buckling; 12. an air inlet; 13. and a through hole.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings, for example, the shapes and structures of the respective members, the mutual positions and connection relationships between the respective portions, the functions and operation principles of the respective portions, and the like.
Example 1:
the embodiment provides a resistive silencing air filter which is compact in structure, good in silencing effect, wide in silencing frequency band, large in adjusting space and low in cost.
As shown in fig. 1, 2 and 5, the resistive noise elimination air filter of the present embodiment includes a housing formed by connecting an upper housing 1 and a lower housing 2 through a buckle 11, wherein the upper housing 1 and the lower housing 2 are sealed by a rubber sealing ring 3; a silencing cavity 5 and a resonant filter cavity are formed in the shell through a vertical partition plate 4; a horizontal filter element 6 is clamped between the upper shell 1 and the lower shell 2, so that the resonance filter cavity is divided into a filter cavity (positioned in the upper shell 1 and not shown in the figure) and a resonance cavity 7 which are vertically spaced, wherein the resonance cavity 7 is positioned in the lower shell 2 and is adjacent to the silencing cavity 5; the shell wall of the upper shell 1 is provided with an air outlet 8 communicated with the filter cavity; the lower shell 2 is provided with an air inlet 12 communicated with the silencing cavity 5 at the position corresponding to the silencing cavity 5, and the partition plate 4 is provided with a through hole 13 at the position corresponding to the air inlet 12; the muffler pipe 9 of the straight pipe structure penetrates through the muffling cavity 5 from the air inlet 12 and extends into the resonant cavity 7 along the through hole 13 of the partition plate 4; the sound absorption cotton 10 is placed in the silencing cavity 5, and the silencing pipe 9 is provided with a plurality of air dissipation through holes 91 at the part of the silencing cavity 5.
As shown in fig. 3, the muffler pipe 9 is composed of a pipe body and a flange plate 92 provided on an outer wall of the pipe body, and the muffler pipe 9 is fixedly connected to the lower housing 2 by bolts passing through the flange plate 92 and the lower housing 2. In the embodiment, the muffler pipe 9 is integrally formed by injection molding of a PP material, the pipe diameter is 60-80 mm, and the wall thickness is 2-3 mm; the pipe wall is equipped with 4 groups of gas through-holes 91 that dispel, and 8 gas through-holes 91 that disperse in every group, the aperture of gas through-hole 91 that looses is 8~15 mm.
As shown in fig. 4, in the present embodiment, the sound-absorbing cotton 10 is made of porous sound-absorbing sponge material with good air permeability (sound-absorbing glass fiber can also be selected), and the sound-absorbing coefficient is required to be greater than 0.5; the whole shape is matched with the lower shell 2, so that the sound absorption cotton 10 is filled in the silencing cavity 5 of the lower shell 2 part, a groove 101 is arranged in the middle of the sound absorption cotton 10 and is used for being embedded into the silencing pipe 9, and the sound absorption cotton 10 is in close contact with the silencing pipe 9.
The outer wall of the lower shell 2 is provided with a mounting frame 21, the mounting frame 21 is provided with a fixing hole, the air filter body is connected with the whole vehicle through a bolt, a rubber vibration damping pad 22 is designed at the bolt connecting part, the structural vibration caused by the operation of the whole vehicle and an engine can be effectively attenuated, so that the air filter shell is protected,
the working principle of the resistive silencing air filter is as follows:
external fresh air enters the silencing pipe 9 from the air inlet 12 and flows along the silencing pipe 9, part of air enters the silencing cavity 5 from the air dispersing through hole 91 of the silencing pipe 9, when the part of air flow contacts the silencing cotton, the silencing cotton generates vibration and generates heat energy due to friction and viscosity, noise is absorbed and converted in the process, and the structure mainly absorbs medium-high frequency sound waves, and the main silencing frequency band is about 300-1000 Hz. Since the silencing cotton only fills half of the silencing cavity 5, the middle and low frequency noises dissipated from the silencing cotton are reflected and consumed in the space without the silencing cotton in the silencing cavity 5, and the phases are overlapped.
The noise elimination principle of the noise elimination cavity 5 is based on the frequency spectrum of the jet noise, and if the total area of the air dispersion through holes 91 is kept unchanged and a plurality of small air dispersion through holes 91 are used for replacing the air dispersion through holes, when the air flow passes through the small air dispersion through holes 91, the frequency spectrum of the jet noise is shifted to high frequency or ultrahigh frequency, so that the audible sound component in the frequency spectrum is obviously reduced. Meanwhile, part of low-frequency pulse order noise can be converted into medium-frequency sound waves after being diffused through the small air-diffusing through holes 91, and the medium-frequency sound waves enter the sound-absorbing cavity 5 and are absorbed by the sound-absorbing cotton 10. In the later adaptation and adjustment process, engineers can adjust the aperture and the number of the air-diffusing through holes 91 to change the noise elimination frequency band and the noise insulation amount, so that the purpose of meeting the NVH adjustment requirements of different engines and the whole vehicle is achieved.
The other part of the airflow directly enters the resonant cavity 7 from the muffling pipe 9, and because the cross section area of the airflow passing through is changed suddenly, an expansion effect is generated, noise is reflected and overlapped in the resonant cavity 7, and the purpose of muffling is achieved, wherein the larger the expansion ratio (the cross section area of the cavity/the cross section area of the muffling pipe 9) is, the better the muffling effect is, and meanwhile, the larger the capacity is, the airflow can be stabilized, and the pulse noise is reduced.
Then the air flow passes through the filter element 6 and enters the filter cavity to achieve the purpose of filtering impurities; finally, the air flow flows out of the air outlet 8 of the filter cavity and enters the engine.
The appearance of the air filter body of the embodiment is not greatly different from that of products in the general industry, and the required arrangement space and the installation mode are not more required.
The present invention has been described in detail with reference to the accompanying drawings, and it is apparent that the present invention is not limited by the above embodiments, and various insubstantial improvements can be made without modification to the present invention.
Claims (5)
1. A resistive silencing air filter is characterized by comprising a silencing cavity, a resonant cavity, a filter cavity, a silencing pipe and a filter element, wherein the silencing cavity is provided with an air inlet, and the silencing pipe penetrates through the silencing cavity from the air inlet and extends into the resonant cavity; the resonant cavity is separated from the filter cavity by the filter element, and the filter cavity is provided with an air outlet; the sound absorption cotton is placed in the sound absorption cavity, and a plurality of air dissipation through holes are formed in the part, located in the sound absorption cavity, of the sound absorption pipe.
2. The air filter of claim 1, characterized in that the sound-absorbing cotton is in close contact with the muffler pipe, and the air-diffusing through holes are uniformly distributed at the pipe body of the muffler pipe.
3. The air filter for resistive noise elimination according to claim 1 or 2, characterized in that it comprises a housing consisting of an upper housing and a lower housing, in which a noise elimination chamber and a resonant filter chamber are formed by vertical partitions; the filter element is clamped between the upper shell and the lower shell so as to separate the resonant filter cavity into the resonant cavity and the filter cavity.
4. The air filter of claim 3, wherein the muffler pipe is composed of a pipe body and a flange plate arranged on the outer wall of the pipe body, and the muffler pipe is fixedly connected with the lower casing through bolts penetrating through the flange plate and the lower casing.
5. The air resistive noise elimination filter according to claim 3, wherein the outer wall of the casing is provided with a mounting frame, and the mounting frame is provided with a fixing hole and a rubber damping pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920782405.3U CN210178492U (en) | 2019-05-28 | 2019-05-28 | Resistant empty filter of eliminating noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920782405.3U CN210178492U (en) | 2019-05-28 | 2019-05-28 | Resistant empty filter of eliminating noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210178492U true CN210178492U (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920782405.3U Active CN210178492U (en) | 2019-05-28 | 2019-05-28 | Resistant empty filter of eliminating noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210178492U (en) |
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2019
- 2019-05-28 CN CN201920782405.3U patent/CN210178492U/en active Active
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