CN111075551A - A cooling fan that is used for noise reduction to protect fan housing and adopts this to protect fan housing - Google Patents
A cooling fan that is used for noise reduction to protect fan housing and adopts this to protect fan housing Download PDFInfo
- Publication number
- CN111075551A CN111075551A CN201811230077.2A CN201811230077A CN111075551A CN 111075551 A CN111075551 A CN 111075551A CN 201811230077 A CN201811230077 A CN 201811230077A CN 111075551 A CN111075551 A CN 111075551A
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- Prior art keywords
- fan
- sound absorption
- ring body
- base
- holes
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
- F01P5/06—Guiding or ducting air to, or from, ducted fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/12—Filtering, cooling, or silencing cooling-air
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a fan guard for reducing noise and a cooling fan adopting the fan guard, wherein the fan guard comprises a base, a fan opening is formed in the base, and a ring body is arranged around the fan opening; the inner side of the ring body is provided with a resonance sound absorption structure, the resonance sound absorption structure comprises a hard plate with a plurality of holes and a sound absorption material, and the sound absorption material is fixed on the inner side of the ring body and arranged between the hard plate and the inner side of the ring body. According to the fan guard and the cooling fan, the hard plate with the holes and the sound absorption material can form a plurality of Helmholtz resonant cavities with different sound absorption frequencies, so that the sound absorption effect of the fan guard on noise with the frequency of hundreds to thousands of kilohertz is ensured, and the broadband noise is favorably reduced.
Description
Technical Field
The invention relates to a wind shield for reducing noise and a cooling fan adopting the wind shield.
Background
The cooling fan is installed close to the radiator for exchanging heat between the cooling air drawn by the fan and the coolant in the radiator. A fan cover (also called a fan shield) is arranged around the fan, and the cooling air is used for rectification, so that the heat dissipation efficiency is improved.
However, a strong vortex is generated in a gap between the front end of the fan and the fan guard cover as the fan is screwed, thereby causing noise.
In order to reduce the noise of the fan, a technician improves the structure of the fan protecting cover.
Fig. 1 and 2 show two solutions provided in JP4278252B 2. In the gap between the fan blades 10 and the wind guard 20, the sound absorbing material 40 is fixed to the wind guard, and the sound absorbing material 40 is fixed to the metal plate 22. The metal plate 22 may also be perforated 23 (fig. 1) or may be non-perforated (fig. 2).
Japanese patent document JP200247938 also discloses a solution, as shown in fig. 3, in which a waterproof and dustproof wrapping portion 83 is provided between the fan blade 10 and the sound-absorbing material 80 to prevent water and sand from damaging the sound-absorbing material 80.
The disadvantages of the above scheme are: the noise generated by the eddy current belongs to broadband noise, and the frequency is from hundreds to thousands of hertz; by adopting the scheme, the noise reduction effect on the broadband noise is limited, and the actual effect is not good.
Disclosure of Invention
The invention aims to provide a wind shield for reducing noise and a cooling fan adopting the wind shield, which are used for solving the problem of poor broadband noise reduction effect in the prior art.
In order to achieve the purpose, the invention provides a fan guard for reducing noise, which comprises a base, wherein a fan opening is formed in the base, and a ring body is arranged around the fan opening; the inner side of the ring body is provided with a resonance sound absorption structure, the resonance sound absorption structure comprises a hard plate with a plurality of holes and a sound absorption material, and the sound absorption material is fixed on the inner side of the ring body and arranged between the hard plate and the inner side of the ring body.
The invention also provides a cooling fan, which comprises a fan body and a fan protecting cover, wherein the fan protecting cover comprises a base, a fan opening for installing the fan body is formed in the base, and a ring body is arranged around the fan opening; the inner side of the ring body is provided with a resonance sound absorption structure, the resonance sound absorption structure comprises a hard plate with a plurality of holes and a sound absorption material, and the sound absorption material is fixed on the inner side of the ring body and arranged between the hard plate and the inner side of the ring body.
According to the fan guard and the cooling fan, the hard plate with the holes and the sound absorption material can form a plurality of Helmholtz resonant cavities with different sound absorption frequencies, so that the sound absorption effect of the fan guard on noise with the frequency of hundreds to thousands of kilohertz is ensured, and the broadband noise is favorably reduced.
As a further improvement of the wind shield and the cooling fan, the sound absorption material is bonded on the inner side of the ring body.
As a further improvement of the fan guard and the cooling fan, the holes are uniformly arranged on the hard plate.
As a further improvement of the wind shield and the cooling fan, the hard plate with the holes is a perforated plate.
As a further improvement of the fan protecting cover and the cooling fan, a sound insulation plate which is perpendicular to the bottom plane of the base is arranged on the base around the fan opening.
Drawings
FIG. 1 is a prior art noise reduction block diagram;
FIG. 2 is a prior art noise reduction block diagram;
FIG. 3 is a block diagram of yet another prior art noise reduction arrangement;
FIG. 4 is a structural diagram of an embodiment of a wind guard provided by the present invention;
FIG. 5 is a block diagram of a resonant sound absorbing structure provided by the present invention;
FIG. 6 is a model of a Helmholtz resonator;
in the figure: 10 is a fan blade, 20 is a wind shield, 22 is a metal plate, 23 is a hole, 40/80 is a sound absorbing material, and 83 is a wrapping part;
1 is a base, 2 is a ring body, 3 is a resonance sound absorption structure, 4 is a perforated plate, 5 is a sound absorption material, 6 is a base layer on the inner side of the ring body, and 7 is a perforation.
Detailed Description
Embodiments of wind protection cover
As shown in fig. 4, the wind guard cover includes a base 1, a ring body 2 and a resonant sound absorption structure 3. The whole wind shield is connected with the radiator through the bolt hole on the base 1 and is fixed on the whole vehicle frame (as other embodiments, the base 1 can also be fixedly connected with the radiator through other modes such as bonding, buckling and the like and modes commonly used in the prior art).
A fan opening used for embedding a fan is formed in the base 1, a ring body 2 is arranged around the fan opening (the ring body 2 can be fixedly installed on the base and also can be integrally formed with the base), and a resonance sound absorption structure 3 is arranged in a space between the inner side of the ring body 2 and the front end portion (namely the top end of the fan blade) of the fan.
As shown in fig. 5, the outermost side (side close to the fan) of the resonance sound absorption structure is a perforated plate 4 (made of aluminum) provided with a plurality of perforations 7; the sound absorption structure is internally provided with a layer of sound absorption material 5, and the sound absorption material 5 is made of glass silk floss in the embodiment. The sound absorbing material 5 is bonded to the inner base layer 6 of the loop body (or directly bonded to the inner side of the loop body 2). 15mm of space is left on the top end of the fan blade and the surface of the perforated plate 4 of the resonance sound absorption structure, so that the collision threshing condition caused by fan shaking in the whole vehicle running process is avoided.
The top layer of resonance sound absorption structure 3 is perforated plate 4, the nexine is the sound absorbing material 5 of a layer of glass silk floss, the sound absorbing material of every perforation nexine forms a subchamber, and the glass silk floss is a porous sound absorbing material and the pore distribution is irregular, this volume that just causes the sound absorbing material that different perforation corresponds to and forms the subchamber is different, these subchambers of top layer perforated plate 4 and nexine can be regarded as a lot of helmholtz resonant cavities, every helmholtz resonant cavity can all be regarded as a mass spring system, there is its fixed resonant frequency.
With reference to FIG. 6, each Helmholtz resonator has a resonant frequency f0；
c is the speed of sound, t is the actual depth of the throat (i.e. the thickness of the perforated plate 4), d is the throat diameter (i.e. the perforation diameter), a is the throat area (i.e. the perforation area) and V is the helmholtz resonator volume (i.e. the volume of the sub-chamber described above).
When the frequency of the vortex noise of the fan broadband is consistent with the resonance frequency of the fan broadband, the vibration of air is caused, and violent vibration and friction are generated, so that sound energy is converted into heat energy, and the noise reduction effect is achieved. That is, the sound absorption frequency of each of the helmholtz resonators is different, and thus the plurality of different helmholtz resonators are combined to achieve a sound absorption effect against noise having a frequency of several hundreds to several kilohertz.
The perforated plate 4 is fixed to the inside of the ring body 2 by a folded and bent portion that is folded inward (toward the inside of the ring body 2), and as another embodiment, the perforated plate 4 may be fixed to the inside of the ring body 2 by utilizing the shape of the inside of the ring body 2.
In this embodiment, the sound absorbing material 5 is fixed to the inner side of the wind shield ring by bonding, but as another embodiment, the sound absorbing material 5 may be fixed to the inner side of the wind shield by being restrained by a tape, a wire harness, or a net.
As another embodiment, the aluminum perforated plate 4 may be replaced with a hard plate (which may itself be perforated or may be perforated by machining) of another material having a plurality of holes (preferably uniformly perforated), such as thin steel plate, hard EVA rubber plate, or the like.
In other embodiments, the sound absorbing material 5 may be replaced by other materials, such as PP + PET sound absorbing cotton, felt material, or glass wool with other thicknesses.
In order to further enhance the sound insulation effect, a circle of sound insulation plate (made of sound insulation material) perpendicular to the bottom plane of the base can be arranged on the base around the fan opening, so that the fan noise is secondarily isolated, and the transmission of the cooling fan noise to the inside and the outside of the vehicle is further reduced.
Cooling Fan embodiments
The cooling fan comprises a fan body and a fan protection cover, wherein a fan opening is formed in the fan protection cover, the fan body is embedded into the fan opening to be installed, and the fan body and the base are fixed on the radiator (other installation modes can be adopted, and the fan body and the base are not required to be directly installed on the radiator). The structure of the wind guard in this embodiment is the same as that described in the above embodiments, and thus, the description thereof is omitted.
Claims (10)
1. A fan guard for reducing noise comprises a base, wherein a fan opening is formed in the base, and a ring body is arranged around the fan opening; the ring is characterized in that a resonance sound absorption structure is arranged on the inner side of the ring body, the resonance sound absorption structure comprises a hard plate with a plurality of holes and a sound absorption material, and the sound absorption material is fixed on the inner side of the ring body and arranged between the hard plate and the inner side of the ring body.
2. The windshield according to claim 1, wherein the sound absorbing material is bonded to the inside of the ring body.
3. The windshield according to claim 1, wherein the apertures are uniformly disposed in the rigid sheet.
4. The windshield according to claim 1, wherein the rigid plate having the plurality of holes is a perforated plate.
5. A wind protection cover according to claim 1 or 2 or 3 or 4, wherein around said fan opening, a sound insulation plate is arranged on the base, perpendicular to the base bottom plane.
6. A cooling fan comprises a fan body and a fan protection cover, wherein the fan protection cover comprises a base, a fan opening for installing the fan body is formed in the base, and a ring body is arranged around the fan opening; the ring is characterized in that a resonance sound absorption structure is arranged on the inner side of the ring body, the resonance sound absorption structure comprises a hard plate with a plurality of holes and a sound absorption material, and the sound absorption material is fixed on the inner side of the ring body and arranged between the hard plate and the inner side of the ring body.
7. A cooling fan according to claim 6, wherein said sound absorbing material is bonded inside said ring body.
8. The cooling fan of claim 6 wherein the holes are uniformly arranged in the rigid plate.
9. The cooling fan in accordance with claim 6, wherein the hard plate having the plurality of holes is a perforated plate.
10. A cooling fan according to claim 6 or 7 or 8 or 9, wherein around the fan opening, a sound-insulating panel is arranged on the base, perpendicular to the base bottom plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811230077.2A CN111075551A (en) | 2018-10-22 | 2018-10-22 | A cooling fan that is used for noise reduction to protect fan housing and adopts this to protect fan housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811230077.2A CN111075551A (en) | 2018-10-22 | 2018-10-22 | A cooling fan that is used for noise reduction to protect fan housing and adopts this to protect fan housing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111075551A true CN111075551A (en) | 2020-04-28 |
Family
ID=70309874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811230077.2A Withdrawn CN111075551A (en) | 2018-10-22 | 2018-10-22 | A cooling fan that is used for noise reduction to protect fan housing and adopts this to protect fan housing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111075551A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1336482A (en) * | 2000-07-31 | 2002-02-20 | 株式会社小松制作所 | Noise reducing mechanism for fan, and porous sound absorbing material formation method |
| CN2527764Y (en) * | 2001-12-30 | 2002-12-25 | 中国科学院声学研究所 | Centrifugal fan with pipe bundle perforated plate resonance sound absorption structure |
| CN102287404A (en) * | 2011-09-22 | 2011-12-21 | 无锡杰尔压缩机有限公司 | Sound absorption structure of soundproof shield |
| WO2017146310A1 (en) * | 2016-02-26 | 2017-08-31 | 주식회사 씨앤월드 | Silencer including sound absorbing perforated plate and sound absorbing module |
| CN108035791A (en) * | 2017-11-27 | 2018-05-15 | 三汽车制造有限公司 | A kind of wind scooper, engine and power-equipment |
| CN209324485U (en) * | 2018-10-22 | 2019-08-30 | 郑州宇通客车股份有限公司 | Wind shelling cover for reducing noise and the cooling fan using the wind shelling cover |
-
2018
- 2018-10-22 CN CN201811230077.2A patent/CN111075551A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1336482A (en) * | 2000-07-31 | 2002-02-20 | 株式会社小松制作所 | Noise reducing mechanism for fan, and porous sound absorbing material formation method |
| CN2527764Y (en) * | 2001-12-30 | 2002-12-25 | 中国科学院声学研究所 | Centrifugal fan with pipe bundle perforated plate resonance sound absorption structure |
| CN102287404A (en) * | 2011-09-22 | 2011-12-21 | 无锡杰尔压缩机有限公司 | Sound absorption structure of soundproof shield |
| WO2017146310A1 (en) * | 2016-02-26 | 2017-08-31 | 주식회사 씨앤월드 | Silencer including sound absorbing perforated plate and sound absorbing module |
| CN108035791A (en) * | 2017-11-27 | 2018-05-15 | 三汽车制造有限公司 | A kind of wind scooper, engine and power-equipment |
| CN209324485U (en) * | 2018-10-22 | 2019-08-30 | 郑州宇通客车股份有限公司 | Wind shelling cover for reducing noise and the cooling fan using the wind shelling cover |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: No. 6, Yutong Road, Guancheng Hui District, Zhengzhou, Henan 450061 Applicant after: Yutong Bus Co.,Ltd. Address before: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Applicant before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200428 |
|
| WW01 | Invention patent application withdrawn after publication |