CN112659843B - Automobile air conditioner shell with silencing cavity structure - Google Patents
Automobile air conditioner shell with silencing cavity structure Download PDFInfo
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- CN112659843B CN112659843B CN202011063198.XA CN202011063198A CN112659843B CN 112659843 B CN112659843 B CN 112659843B CN 202011063198 A CN202011063198 A CN 202011063198A CN 112659843 B CN112659843 B CN 112659843B
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- air conditioner
- silencing
- silencing cavity
- cover plate
- noise
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses
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- Air-Conditioning For Vehicles (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention relates to the field of automobile air conditioner shell silencing, and discloses an automobile air conditioner shell with a silencing cavity structure, which comprises an air conditioner shell main body, wherein a silencing cavity is inwards formed in the outer side of the shell position between an air outlet of a blower and an air inlet of an evaporator on the air conditioner shell main body, a cover plate for sealing the silencing cavity is covered on the silencing cavity, a plurality of openings are formed in the cover plate, and the openings are sealed through silencing felts. The automobile air conditioner shell with the silencing cavity structure has a good sound absorption effect, reduces sound absorption cotton, does not reduce the performance of an air conditioner, can improve specific noise frequency bands, and saves the trial and error cost.
Description
Technical Field
The invention relates to the field of automobile air conditioner shell silencing, in particular to an automobile air conditioner shell with a silencing cavity structure.
Background
With the increasingly widespread use of automobile air conditioners, the noise problem caused by the use of automobile air conditioners is increasingly prominent, the requirement of drivers and passengers on the comfort in the automobile is higher, and the problem of further improving the noise caused by the use of automobile air conditioners is urgent.
At present, the pneumatic noise is improved by utilizing a silencing cavity structure, and two modes of microperforated panel resonance sound absorption and panel-membrane resonance sound absorption are mainly adopted;
resonance sound absorption of a micro-perforated plate: according to the principle, the sound absorption frequency is inversely proportional to the volume of the sound attenuation cavity, so that the volume of the sound attenuation cavity required for improving the low-frequency noise of the air conditioner is large, the boundary size of the air conditioner is limited, and a large enough space position cannot be provided for improving the low-frequency noise, so that the resonance sound absorption method of the micro-perforated plate is not commonly used for improving the noise of the air conditioner of the automobile;
plate-membrane resonance sound absorption: the principle of the method is similar to the resonance sound absorption of a micro-perforated plate, only the orifice plate is changed into other materials (such as a paperboard, a plastic film, paper and the like), the method for improving the noise is limited by the selection of the membrane material and the influence of the wind speed on the membrane material, the general membrane material cannot be suitable for the environment because the inside of the air conditioner is the environment integrating high wind speed, high temperature and high humidity, and other extra noise is easily brought to the air conditioner due to the surface roughness of the membrane material.
In view of the above reasons, the current noise problem caused by improving the air conditioner of the automobile is mainly solved by the following two ways:
1. adding parts: sound absorption cotton is added at the periphery of the air conditioner to prevent the noise inside the air conditioner from being diffused to the passenger compartment;
2. performance sacrifice: the maximum air volume of the air conditioner is reduced, and the problem of wind noise caused by large air volume is weakened.
The two modes are helpful for improving the noise of the automobile air conditioner, but the performance and the cost of the air conditioner are sacrificed, and the targeted improvement can not be carried out according to the frequency band of the noise.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an automobile air conditioner shell with a silencing cavity structure, which has a good sound absorption effect, reduces sound absorption cotton, does not reduce the performance of an air conditioner, can improve specific noise frequency bands, and saves trial and error cost.
In order to achieve the purpose, the automobile air conditioner shell with the silencing cavity structure comprises an air conditioner shell body, wherein a silencing cavity is formed in the air conditioner shell body and is located between an air outlet of a blower and an air inlet of an evaporator, the outer side of the shell body is inwards arranged, the silencing cavity is covered with a cover plate for sealing the silencing cavity, a plurality of openings are formed in the cover plate, and the openings are sealed through silencing felts.
Preferably, the cover plate and the noise reduction felt are integrally injection-molded.
Preferably, the cover plate is fixed to the air-conditioning case main body by at least three screws.
Preferably, the noise reduction felt has the surface density of 300kg/m 3 ～800kg/m 3 The PET felt material can effectively eliminate the noise of the medium frequency 1000 Hz-3000 Hz.
Preferably, the noise reduction felt has the area density of 400kg/m 3 The PET felt material has the best noise reduction effect on medium-frequency 1000 Hz-3000 Hz noise.
Preferably, the thickness of the noise reduction felt is adjusted to reduce noise in different frequency bands.
Compared with the prior art, the invention has the following advantages:
1. the silencing cavity is integrated on the main body of the air conditioner shell, and a resonance body formed by the silencing felt and the silencing cavity at the back of the silencing felt absorbs sound wave energy and converts the sound energy into vibration energy to be consumed, so that the silencing effect is good;
2. the air conditioner noise can be improved by adjusting the position of the silencing cavity and the thickness of the silencing felt, and the noise of each frequency band can be improved by adjusting the thickness of the silencing felt;
3. compared with other methods for improving the noise of the automobile air conditioner, the method reduces the sound absorption cotton, does not reduce the performance of the air conditioner, can improve specific noise frequency bands, and saves the trial and error cost.
Drawings
FIG. 1 is a schematic structural view of an automotive air conditioning housing with a muffling chamber structure according to the present invention;
FIG. 2 is a schematic structural view of the cover plate of FIG. 1;
FIG. 3 is a schematic view of the cover plate mounted on the air conditioner case body;
FIG. 4 is a schematic view of the addition of sound absorbing cotton on the outer surface of the air conditioner;
FIG. 5 is a schematic diagram of a resonance sound absorption method using a micro-perforated plate;
FIG. 6 is a comparison graph of test data of adding sound absorbing cotton on the outer surface of the air conditioner;
FIG. 7 is a comparison graph of data from a test using a micro-perforated sound-damping chamber configuration in an air conditioner;
FIG. 8 is a graph comparing experimental data for a structure of a felt plate membrane of a muffling chamber used in an air conditioner according to the present invention.
The components in the figures are numbered as follows:
air conditioner casing main part 1, amortization chamber 2, apron 3, opening 4, amortization felt 5, screw 6.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, 2 and 3, the automobile air-conditioning casing with the silencing cavity structure comprises an air-conditioning casing main body, wherein the outer side of the casing position between an air outlet of a blower and an air inlet of an evaporator on the air-conditioning casing main body is inwards provided with the silencing cavity, the silencing cavity is covered with a cover plate for sealing the silencing cavity, the cover plate is fixed on the air-conditioning casing main body through three screws, the cover plate is provided with a plurality of openings, the openings are sealed through silencing felts, and the cover plate and the silencing felts are integrally molded through injection molding.
For the embodiment, through simulation calculation, the middle-high frequency band is the main noise source position, and the noise source is mainly concentrated between the air outlet of the blower and the air inlet of the evaporator, so that the position is provided with the silencing cavity and the cover plate is covered. When the air conditioner is used, sound waves act on the silencing felt to push the silencing felt to vibrate back and forth, and a resonance body formed by the silencing felt and a silencing cavity behind the silencing felt absorbs sound wave energy and converts the sound energy into vibration energy to be consumed, so that the effect of weakening noise is achieved.
In this embodiment, the noise-reducing felt may have an areal density of 300kg/m 3 ～800kg/m 3 The PET felt material further solves the noise of the medium frequency 1000 Hz-3000 Hz, and the noise reduction felt has the surface density of 400kg/m 3 The PET felt material of (a) is most effective.
In addition, the thickness of the noise reduction felt can be adjusted to reduce noise of different frequency bands.
Compared with the prior art, for example: as shown in FIG. 4, the sound-absorbing cotton is added on the outer surface of the air conditioner by using the traditional noise reduction scheme, and the test result is shown in FIG. 6, and the noise reduction effect of the sound-absorbing cotton is weak.
As shown in figure 5, the resonance sound absorption method of the micro-perforated plate is used, the silencing structure of the micro-perforated plate is added in the air conditioner, the test result is shown in figure 7, it can be seen that the resonance method of the micro-perforated plate has great benefit on improving the noise of the air conditioner, but the noise requirement of a customer is still not met, and the scheme needs to add 4 additional parts, and the cost increase is high.
And after the test, the result is as shown in fig. 8, the improvement benefit of the structure of the silencing cavity matched with the silencing felt to the noise of the air conditioner is huge, and additional parts are not needed.
According to the automobile air conditioner shell with the silencing cavity structure, the silencing cavity is integrated on the main body of the air conditioner shell, and the resonance body formed by the silencing felt and the silencing cavity at the back of the silencing felt absorbs sound wave energy and converts the sound energy into vibration energy to be consumed, so that the silencing effect is good; the noise of the air conditioner can be improved by adjusting the position of the silencing cavity and the thickness of the silencing felt, and the noise of each frequency band can be improved by adjusting the thickness of the silencing felt; compared with other methods for improving the noise of the automobile air conditioner, the method reduces the sound absorption cotton, does not reduce the performance of the air conditioner, can improve specific noise frequency bands, and saves the trial and error cost.
Claims (4)
1. The utility model provides a take vehicle air conditioner casing of amortization cavity structure, includes air conditioner casing main part (1), its characterized in that: the air conditioner shell is characterized in that a silencing cavity (2) is formed in the air conditioner shell body (1) and is located between an air outlet of a blower and an air inlet of an evaporator, the outer side of the shell is inwards opened, the silencing cavity (2) is covered with a cover plate (3) for sealing the silencing cavity, a plurality of openings (4) are formed in the cover plate (3), the openings (4) are sealed through silencing felts (5), the cover plate (3) and the silencing felts (5) are integrally formed in an injection molding mode, and the silencing felts (5) are 300kg/m in surface density 3 ～800kg/m 3 The PET felt material of (1).
2. The air conditioner casing with a sound attenuation chamber structure for an automobile according to claim 1, wherein: the cover plate (3) is fixed on the air conditioner shell body (1) through at least three screws (6).
3. The air conditioner casing with a sound attenuation chamber structure as claimed in claim 1, wherein: the surface density of the silencing felt (5) is 400kg/m 3 The PET felt material of (1).
4. The air conditioner casing with a sound attenuation chamber structure as claimed in claim 1, wherein: and the thickness of the silencing felt (5) is adjusted to silence noises in different frequency bands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011063198.XA CN112659843B (en) | 2020-09-30 | 2020-09-30 | Automobile air conditioner shell with silencing cavity structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011063198.XA CN112659843B (en) | 2020-09-30 | 2020-09-30 | Automobile air conditioner shell with silencing cavity structure |
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| Publication Number | Publication Date |
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| CN112659843A CN112659843A (en) | 2021-04-16 |
| CN112659843B true CN112659843B (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011063198.XA Active CN112659843B (en) | 2020-09-30 | 2020-09-30 | Automobile air conditioner shell with silencing cavity structure |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008261338A (en) * | 2008-04-23 | 2008-10-30 | Komatsu Ltd | Muffler device for air intake port of vehicle |
| CN202709332U (en) * | 2012-04-23 | 2013-01-30 | 海尔集团公司 | Noise reduction structure part and air conditioner |
| CN104061631B (en) * | 2014-06-12 | 2018-03-06 | 珠海格力电器股份有限公司 | Structure of making an uproar and having this air conditioner of making an uproar structure falls in outer machine of air conditioner |
| CN209483457U (en) * | 2019-01-11 | 2019-10-11 | 中弗汽车工业(宁波)有限公司 | A kind of noise reduction resonator components for automobile engine |
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| CN112659843A (en) | 2021-04-16 |
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