CN110030720A - A kind of cavity fills the medium-high frequency silencing means of spherosome in bulk - Google Patents
A kind of cavity fills the medium-high frequency silencing means of spherosome in bulk Download PDFInfo
- Publication number
- CN110030720A CN110030720A CN201910340386.3A CN201910340386A CN110030720A CN 110030720 A CN110030720 A CN 110030720A CN 201910340386 A CN201910340386 A CN 201910340386A CN 110030720 A CN110030720 A CN 110030720A
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- cavity
- air inlet
- high frequency
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- air
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Links
- 230000030279 gene silencing Effects 0.000 title claims abstract description 29
- 239000012798 spherical particle Substances 0.000 claims abstract description 36
- 230000008030 elimination Effects 0.000 claims description 17
- 238000003379 elimination reaction Methods 0.000 claims description 17
- 230000009467 reduction Effects 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 3
- 208000002925 dental caries Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 208000009205 Tinnitus Diseases 0.000 description 1
- 238000010420 art technique Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000886 tinnitus Toxicity 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/242—Sound-absorbing material
Landscapes
- 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 present invention provides the medium-high frequency silencing means that a kind of cavity fills spherosome in bulk, including shell, the cavity of inner hollow is formed in shell, multiple spherical particles are filled in the cavity, the housing sidewall forms the air inlet and air outlet being connected to cavity, blower set on hull outside is sucked air stream by air inlet, it is discharged after the spherical particle in cavity by air outlet, it is in contact to form the angle gap with radian between spherical particle in cavity, the sound wave of medium-high frequency can be suppressed after air-flow warp.The present invention in the cavity of shell by laying the multiple spherical particles being mutually close to, can the howling (medium, high frequency noise) to the air stream of entrance effectively remove, solve the problems, such as that unsolved medium-high frequency noise is difficult to eliminate existing fresh air system for a long time, simple process, cost of implementation are low compared with prior art, and eradicating efficacy is excellent.
Description
Technical field
The present invention relates to noise reduction technical field, specifically a kind of cavity fills the medium-high frequency silencing means of spherosome in bulk.
Background technique
Fresh air system is according in closed indoor side sending fresh air to interior with special equipment, then from the other side by dedicated
Equipment will form the principle of " fresh air field of flow " to outdoor discharge indoors, to meet the needs of indoor fresh air ventilating.Implement
Scheme is: centrifugal blower is driven using high-head, big flow small power DC high-speed brushless motor, by mechanical strength by side
To indoor air-supply, is forced from the other side with the new blower of the air draft specially designed to the mode of outdoor discharge and form fresh air in system
Field of flow.To the air entered the room into fresh air filtering, the poison that goes out, sterilization, oxygenation, preheating (winter) while air-supply.Air draft
It is exchanged by carrying out recuperation of heat with fresh air when host, recycles most of energy by fresh air and send interior back to.
Now many families can all install fresh air system, and air quality indoor in this way is available guarantee, still
After installing fresh air system, indoor noise is also more troublesome.The noise of fresh air system is made an uproar mainly from host noise and air port
Sound, wherein host noise a part is the noise of motor running, and a part is the noise that wind flow at high speed generates, by selecting matter
Motor really up to the mark is measured, the noise of host operating is essentially without worry；Air port noise i.e. wind are made an uproar, and need meeting air quantity foot
Precursor under guarantee that air port noise is sufficiently low, the erasure effect of centrifugal blower in existing fresh air system (using spiral vortex air machine)
Bad, noise is still very big, especially a kind of medium, high frequency noise (usually said uttering long and high-pitched sounds similar to tinnitus of blower generation
Sound) it is difficult to eliminate.
Summary of the invention
The present invention provides the medium-high frequency silencing means that a kind of cavity fills spherosome in bulk, can effectively generate to blower
Medium, high frequency noise is eliminated, and structure is simple, and cost of implementation is low, and effect is good.
A kind of cavity fills the medium-high frequency silencing means of spherosome in bulk, including shell, forms inner hollow in shell
Cavity, the cavity is interior to be filled with multiple spherical particles, and the housing sidewall forms the air inlet and air outlet being connected to cavity,
Blower set on hull outside is sucked air stream by air inlet, is discharged after the spherical particle in cavity by air outlet, empty
It is in contact to form the angle gap with radian between spherical particle in chamber, the sound wave of medium-high frequency can be pressed down after air-flow warp
System.
Further, the shell is a upper opening, the cavity structure that lower part is upper female curved plate, the shell
The inner cavity of body is divided into exhaust cavity and air inlet cavity by intermediate membrane, wherein the side wall of exhaust cavity is equipped with exhaust cavity outlet
Mouthful, the curved plate for being vented cavity bottom offers blower exhaust outlet, and the side wall of air inlet cavity is equipped with air inlet cavity air inlet, into
The bottom plate of air cavity bottom offers fan air inlet, is vented cavity and air inlet cavity is packed into spherical particle, blower and arcuate bottom
The recesses fit of plate is installed.
Further, the negative pressure that blower generates is sucked air stream by the air inlet cavity air inlet of air inlet cavity wall, gas
Flow the air inlet by entering blower after the spherical particle noise reduction in air inlet cavity from the fan air inlet of air inlet cavity bottom, gas
Stream enters after blower and enters exhaust cavity from the blower exhaust outlet of exhaust cavity bottom by the air outlet of blower, by being vented cavity
It is sent out after interior spherical particle noise reduction from the exhaust cavity gas outlet of side wall.
Further, the diameter of the spherical particle is 3-50mm.
Further, the diameter of the spherical particle is 7.5mm.
Further, the material of the spherical particle is glass or ceramics.
Further, it is vented cavity and the inner sidewall of air inlet cavity is equipped with mesh, the mesh diameter of mesh is less than
The diameter of spherical particle.
Further, the mesh is metal mesh or plastic wire.
Further, the intermediate membrane two sides of the shell are respectively equipped with the first noise elimination felt and hinged with the first noise elimination felt
The second noise elimination felt, the second noise elimination felt it is bent by air inlet cavity or be vented cavity upper opening cover.
Further, the upper opening of the shell uses cover plate for sealing.
The present invention, can be to the air stream of entrance by laying the multiple spherical particles being mutually close in the cavity of shell
Howling (medium, high frequency noise) is effectively removed, and solving existing fresh air system, unsolved medium-high frequency is made an uproar for a long time
Sound is difficult to the problem of eliminating, and actual product achieves satisfied testing result by profession detection, compared with prior art technique letter
List, cost of implementation are low, and eradicating efficacy is excellent, and the blower noise reduction especially for fresh air system provides new solution,
Have a vast market application prospect.
Detailed description of the invention
Fig. 1 is the three-dimensional knot for a part of structure of medium-high frequency silencing means embodiment that cavity of the present invention fills spherosome in bulk
Structure schematic diagram；
Fig. 2 is a part of structure other direction of medium-high frequency silencing means embodiment that cavity of the present invention fills spherosome in bulk
Schematic perspective view；
Fig. 3 is the decomposition texture signal for the medium-high frequency silencing means embodiment one that cavity of the present invention fills spherosome in bulk
Figure；
Fig. 4 be cavity of the present invention fill spherosome in bulk medium-high frequency silencing means embodiment one use when state illustrate
Figure；
Fig. 5 is the three-dimensional knot for two part-structure of medium-high frequency silencing means embodiment that cavity of the present invention fills spherosome in bulk
Structure schematic diagram；
Fig. 6 is that indoor sound frequency range distribution map is surveyed before silencing means of the present invention is not used；
Fig. 7 is using surveying indoor sound frequency range distribution map after silencing means of the present invention.
In figure: 1-shell, 2-exhaust cavitys, 3-air inlet cavitys, 4-bottom plates, 5-exhaust cavity gas outlets, 6-wind
Machine exhaust outlet, 7-air inlet cavity air inlets, 8-fan air inlets, 9-meshes, 10-spherical particles, 11-cover boards, 12-
Blower, the 13-the first noise elimination felt, the 14-the second noise elimination felt.
Specific embodiment
Below in conjunction with the attached drawing in the present invention, the technical solution in the present invention is clearly and completely described.
Please referring to Fig. 1-3, the present invention provides the medium-high frequency silencing means that a kind of cavity fills spherosome in bulk, one of them
Embodiment includes shell 1, and the cavity of inner hollow is formed in shell 1, and multiple spherical particles 10 are filled in the cavity, described
1 side wall of shell forms the air inlet and air outlet being connected to cavity, and the blower outside shell 1 is inhaled air stream by air inlet
Enter, be discharged after the spherical particle 10 in cavity by air outlet, is in contact to be formed with arc between spherical particle 10 in cavity
The angle gap of degree, the sound wave of medium-high frequency can be suppressed after air-flow warp, to realize preferable erasure effect.
Specifically, the shell 1 is a upper opening in one of the embodiments, lower part is upper female arcuate bottom
The inner cavity of the cavity structure of plate 4, the shell 1 is divided into exhaust cavity 2 and air inlet cavity 3 by intermediate membrane, wherein discharge chamber
The side wall of body 2 is equipped with exhaust cavity gas outlet 5, and the bottom plate 4 of exhaust 2 bottom of cavity offers blower exhaust outlet 6, corresponding, into
The side wall of air cavity 3 is equipped with air inlet cavity air inlet 7, and the bottom plate 4 of 3 bottom of air inlet cavity offers fan air inlet 8.
As shown in figure 3, be each filled with spherical particle 10 in exhaust cavity 2 and air inlet cavity 3, the spherical particle 10 it is straight
Diameter is 3-50mm, and the present embodiment takes 7.5mm, and material is glass or ceramics, and the present embodiment uses bead, and quantity is about
3000, it is vented cavity 2 and air inlet cavity 3 each 1500 or so.To avoid spherical particle 10 from exhaust cavity 2 and air inlet cavity
Leaking out or rolling in 3 influences erasure effect, can be laid with mesh 9, such as gold in the inner sidewall of exhaust cavity 2 and air inlet cavity 3
Belong to net, plastic wire etc., mesh diameter is less than the diameter of spherical particle 10, so that spherical particle 10 is not leaked out from mesh 9
It is advisable.
In use, incorporated by reference to reference Fig. 3 and Fig. 4, after spherical particle 10 is packed into exhaust cavity 2 and air inlet cavity 3, shell 1
Upper opening form the medium-high frequency silencing means that the cavity fills spherosome in bulk using the sealing of cover board 11, afterwards turning over makes
Blower 12 upward, is installed on shell 1, blower 12 and the recess portion of curved plate 4 are coupled just, wind by the bottom plate 4 for obtaining shell 1
The connection corresponding with air inlet cavity 3 of machine air inlet 8, the connection corresponding with exhaust cavity 2 of blower exhaust outlet 6.When work, blower 12 is generated
Negative pressure air stream is sucked by the air inlet cavity air inlet 7 of 3 side wall of air inlet cavity, air-flow passes through spherical in air inlet cavity 3
Enter the air inlet of blower 12 after 10 noise reduction of particle from the fan air inlet 8 of 3 bottom of air inlet cavity, air-flow enter after blower 12 by
The air outlet of blower 12 enters exhaust cavity 2 from the blower exhaust outlet 6 of exhaust 2 bottom of cavity, by spherical in exhaust cavity 2
It is sent out after 10 noise reductions of grain from the exhaust cavity gas outlet 5 of side wall.
Referring to Fig. 5, in another embodiment, the intermediate membrane two sides of the shell 1 are respectively equipped with the first noise elimination felt 13
And hinged the second noise elimination felt 14 with the first noise elimination felt 13, the second noise elimination felt 14 are bent by air inlet cavity 3 or exhaust cavity 2
Upper opening capping, as shown in figure 5, exhaust cavity 2 upper opening to be sealed by the second noise elimination felt 14.First noise elimination felt 13
And second the setting of noise elimination felt 14 preferably the intracorporal spherical particle of chamber 10 can be limited, prevent spherical particle 10 in chamber
It is shaken in body, it is often more important that enhance erasure effect.
Compared with prior art, the beneficial effects of the present invention are: cavity provided by the invention is filled in spherosome in bulk
High frequency silencing means using partial size for 3-5mm spherical particle 10 as sound-absorbing component, the spherical particle of the partial size is to noise sound wave
There is preferable scattering process, be in contact the angle gap to be formed with radian between spherical particle 10, the sound wave after air-flow warp
It is constantly reflected in angle gap, the sound wave of high frequency can be suppressed, to realize preferable erasure effect.
The present invention is that inventor's one kind that research is found out through great efforts in actual production hair R&D process is effective
Technical solution, solve the problems, such as that unsolved medium-high frequency noise is difficult to eliminate existing fresh air system for a long time, it is practical
Product achieves satisfied testing result by profession detection: when silencing means of the present invention is not used, blower is transported with maximum power
It is the 95.1 decibels of (specified values of country to resident's indoor environment noise: on daytime no more than 50 points that room noise is detected when row
Shellfish, night is no more than 45 decibels), and the use of room noise is detected after silencing means of the invention is only 29.8 decibels, noise reduction
Effect clearly, by software test, the main reason is that human ear is most sensitive to the sound of 2k~5kHz, and through the invention
Design the high-frequency sound near 2k is obviously eliminated into (as shown in Figure 7), that is, greatly reduce room noise.Moreover, installation is originally
To air stream, there is no apparent drag effects after the silencing means of invention, i.e., without the wind velocity out for influencing blower, by reality
Border detection, the wind pressure of air outlet can achieve
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. the medium-high frequency silencing means that a kind of cavity fills spherosome in bulk, it is characterised in that: including shell (1), shell (1) is interior
The cavity of inner hollow is formed, is filled with multiple spherical particles (10) in the cavity, shell (1) side wall is formed and cavity
The air inlet and air outlet of connection are set to shell (1) external blower and suck air stream by air inlet, by the ball in cavity
Shape particle is discharged after (10) by air outlet, and be in contact between spherical particle (10) the angle gap to be formed with radian in cavity,
The sound wave of medium-high frequency can be suppressed after air-flow warp.
2. the medium-high frequency silencing means that cavity as described in claim 1 fills spherosome in bulk, it is characterised in that: the shell
(1) be a upper opening, the cavity structure that lower part is upper female curved plate (4), the inner cavity of the shell (1) by middle part every
Plate is divided into exhaust cavity (2) and air inlet cavity (3), wherein the side wall of exhaust cavity (2) is equipped with exhaust cavity gas outlet (5),
The curved plate (4) of exhaust cavity (2) bottom offers blower exhaust outlet (6), and the side wall of air inlet cavity (3) is equipped with air inlet cavity
The bottom plate (4) of air inlet (7), air inlet cavity (3) bottom offers fan air inlet (8), is vented cavity (2) and air inlet cavity
(3) spherical particle (10) are packed into, the recesses fit of blower (12) and curved plate (4) is installed.
3. the medium-high frequency silencing means that cavity as claimed in claim 2 fills spherosome in bulk, it is characterised in that: blower (12)
The negative pressure of generation is sucked air stream by the air inlet cavity air inlet (7) of air inlet cavity (3) side wall, and air-flow passes through air inlet cavity
(3) enter the air inlet of blower (12) after spherical particle (10) noise reduction in from the fan air inlet (8) of air inlet cavity (3) bottom
Mouthful, air-flow enters after blower (12) and enters row from the blower exhaust outlet (6) of exhaust cavity (2) bottom by the air outlet of blower (12)
Air cavity (2) is sent out after being vented cavity (2) interior spherical particle (10) noise reduction from the exhaust cavity gas outlet (5) of side wall.
4. the medium-high frequency silencing means that cavity as described in claim 1 fills spherosome in bulk, it is characterised in that: described spherical
The diameter of particle (10) is 3-50mm.
5. the medium-high frequency silencing means that cavity as claimed in claim 4 fills spherosome in bulk, it is characterised in that: described spherical
The diameter of particle (10) is 7.5mm.
6. the medium-high frequency silencing means that cavity as described in claim 1 fills spherosome in bulk, it is characterised in that: described spherical
The material of particle (10) is glass or ceramics.
7. the medium-high frequency silencing means that cavity as claimed in claim 2 fills spherosome in bulk, it is characterised in that: exhaust cavity
(2) it is equipped with mesh (9) with the inner sidewall of air inlet cavity (3), the mesh diameter of mesh (9) is less than spherical particle (10)
Diameter.
8. the medium-high frequency silencing means that cavity as claimed in claim 7 fills spherosome in bulk, it is characterised in that: described netted
Object (9) is metal mesh or plastic wire.
9. the medium-high frequency silencing means that cavity as claimed in claim 2 fills spherosome in bulk, it is characterised in that: the shell
(1) intermediate membrane two sides are respectively equipped with the first noise elimination felt (13) and second noise elimination felt hinged with the first noise elimination felt (13)
(14), the second noise elimination felt (14) is bent covers air inlet cavity (3) or the upper opening of exhaust cavity (2).
10. the medium-high frequency silencing means that cavity as described in claim 1 fills spherosome in bulk, it is characterised in that: the shell
The upper opening of body (1) is sealed using cover board (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910340386.3A CN110030720B (en) | 2019-04-25 | 2019-04-25 | Medium-high frequency silencer with cavity filled with bulk spheres |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910340386.3A CN110030720B (en) | 2019-04-25 | 2019-04-25 | Medium-high frequency silencer with cavity filled with bulk spheres |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110030720A true CN110030720A (en) | 2019-07-19 |
| CN110030720B CN110030720B (en) | 2024-02-06 |
Family
ID=67240267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910340386.3A Active CN110030720B (en) | 2019-04-25 | 2019-04-25 | Medium-high frequency silencer with cavity filled with bulk spheres |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110030720B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775572A (en) * | 2021-08-25 | 2021-12-10 | 湖南泛航智能装备有限公司 | Noise reduction structure and noise reduction method of high-speed high-pressure centrifugal blower |
| CN114001420A (en) * | 2021-10-27 | 2022-02-01 | 马祥程 | Low-noise total-heat net-effect fresh air fan |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10299115A (en) * | 1997-04-28 | 1998-11-10 | Heisei Sangyo:Kk | Sound absorbing material, sound absorbing device and sound absorbing material installing construction method |
| US6089348A (en) * | 1999-09-22 | 2000-07-18 | Bokor Manufacturing Inc. | Blower noise silencer |
| US20090229913A1 (en) * | 2008-02-08 | 2009-09-17 | Waldron's Antique Exhaust | Dual Mode Exhaust Muffler |
| US8684131B1 (en) * | 2012-12-12 | 2014-04-01 | Kia Motors Corporation | Dual muffler |
| CN105485793A (en) * | 2015-12-25 | 2016-04-13 | 广东美的制冷设备有限公司 | Compressor assembly, outdoor unit and air conditioner |
| CN206656482U (en) * | 2017-04-24 | 2017-11-21 | 浙江方宏空调设备有限公司 | A kind of trumpet type silencer of air conditioning for automobiles |
| CN209877323U (en) * | 2019-04-25 | 2019-12-31 | 沈志伟 | Medium-high frequency silencer with cavity filled with bulk spheres |
-
2019
- 2019-04-25 CN CN201910340386.3A patent/CN110030720B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10299115A (en) * | 1997-04-28 | 1998-11-10 | Heisei Sangyo:Kk | Sound absorbing material, sound absorbing device and sound absorbing material installing construction method |
| US6089348A (en) * | 1999-09-22 | 2000-07-18 | Bokor Manufacturing Inc. | Blower noise silencer |
| US20090229913A1 (en) * | 2008-02-08 | 2009-09-17 | Waldron's Antique Exhaust | Dual Mode Exhaust Muffler |
| US8684131B1 (en) * | 2012-12-12 | 2014-04-01 | Kia Motors Corporation | Dual muffler |
| CN105485793A (en) * | 2015-12-25 | 2016-04-13 | 广东美的制冷设备有限公司 | Compressor assembly, outdoor unit and air conditioner |
| CN206656482U (en) * | 2017-04-24 | 2017-11-21 | 浙江方宏空调设备有限公司 | A kind of trumpet type silencer of air conditioning for automobiles |
| CN209877323U (en) * | 2019-04-25 | 2019-12-31 | 沈志伟 | Medium-high frequency silencer with cavity filled with bulk spheres |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775572A (en) * | 2021-08-25 | 2021-12-10 | 湖南泛航智能装备有限公司 | Noise reduction structure and noise reduction method of high-speed high-pressure centrifugal blower |
| CN113775572B (en) * | 2021-08-25 | 2023-09-26 | 湖南泛航智能装备有限公司 | Noise reduction structure and noise reduction method for high-speed high-pressure centrifugal blower |
| CN114001420A (en) * | 2021-10-27 | 2022-02-01 | 马祥程 | Low-noise total-heat net-effect fresh air fan |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110030720B (en) | 2024-02-06 |
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