CN106321474B - A kind of ultra-low noise quo of local Fan for Mine - Google Patents
A kind of ultra-low noise quo of local Fan for Mine Download PDFInfo
- Publication number
- CN106321474B CN106321474B CN201610918954.XA CN201610918954A CN106321474B CN 106321474 B CN106321474 B CN 106321474B CN 201610918954 A CN201610918954 A CN 201610918954A CN 106321474 B CN106321474 B CN 106321474B
- Authority
- CN
- China
- Prior art keywords
- inner casing
- noise
- air inlet
- flange
- noise reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000463 material Substances 0.000 claims abstract description 29
- 230000001603 reducing Effects 0.000 claims abstract description 29
- 238000006722 reduction reaction Methods 0.000 claims abstract description 29
- 230000003584 silencer Effects 0.000 claims abstract description 28
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 6
- 238000005187 foaming Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 239000011491 glass wool Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000428 dust Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000009423 ventilation Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000001743 silencing Effects 0.000 description 2
- 201000000162 ITM2B-related cerebral amyloid angiopathy 1 Diseases 0.000 description 1
- 230000000903 blocking Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000000505 pernicious Effects 0.000 description 1
- 230000000644 propagated Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002588 toxic Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/664—Sound attenuation by means of sound absorbing material
Abstract
A kind of ultra-low noise quo of local Fan for Mine, including exit silencer, main body, suction muffler, main body include motor, impeller, inner casing, shell；Suction muffler includes current collector, noise reduction wall, silencer cylinder, side air admission mouth and air inlet velar plate, advantageous effect：It is connected and fixed by elastic material between inner casing and shell, considerably reduces the radiated noise of host housing；Suction muffler is changed by area of section, is expanded or is shunk suddenly by means of pipeline section, achievees the purpose that once to eliminate the noise；When sound wave enters noise elimination wall, a part of acoustic energy rubs in the gap of porous material and is converted to thermal energy consumption and dissipates, to reach secondary noise elimination purpose；Noise reduction wall can very easily extract cleaning or replacement out after being blocked by dust, keep erasure effect, repair time short；Acoustic wave segment at sound source is entered the wind orifice plate rear portion to side and is absorbed by deadener, to reach purpose of eliminating the noise three times.
Description
Technical field
The present invention relates to a kind of mine ventilation equipments, and in particular to a kind of ultra-low noise quo of local Fan for Mine.
Background technology
Mine ventilation system is an important component of pit mining, is the basic guarantee of mine safety production, mine
With to revolving booster（Hereinafter referred to as local fan）Effect be in Mine Production, continually by fresh air
It is transported to working face in the pit, staff breathes and dilute and exclude the various toxic, pernicious gases in underground and mine dust, creates good
Working environment, ensure the health and safety of underground operators.
The local fan that domestic production at present uses mainly has the series such as FBD, FB, FBDC, FBY, the motor of these wind turbines
It is all made of two level explosion separation motor, motor speed is high, and aerodynamic noise is big；Most types are equipped with inlet and outlet silencer, but effect of eliminating the noise
Fruit is general, cannot meet user's requirement.
Invention content
The purpose of the present invention is exactly to provide a kind of ultra-low noise mining partial ventilation to further decrease the noise of wind turbine
Machine.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of ultra-low noise quo of local Fan for Mine, including exit silencer, main body, suction muffler, feature exist
In：Main body includes motor, impeller, inner casing, shell, and the inner casing includes preceding inner casing, rear inner casing, and the shell includes upper
Shell, lower housing have impeller in preceding inner casing, have motor in rear inner casing, there is flange, preceding inner casing and rear inner casing on motor
It is connect respectively with motor by flange, there is anti-rotation sheet on inner casing, be fixed on by several rubber bars between inner casing and shell
Together；There are two rubber slab on lower housing, rubber slab is contacted with anti-rotation sheet prevents inner casing from rotating；In upper shell, lower housing
There are rubber pad, rubber pad to limit inner casing and be axially moved on the flange inner face at both ends；Upper shell, lower housing are bolted, knot
Close the sealing of face paste gasket.
According to above-described ultra-low noise quo of local Fan for Mine, it is characterised in that：The suction muffler includes
Current collector, noise reduction wall, silencer cylinder, side air admission mouth and air inlet velar plate, the current collector is by first flange, fair water cone branch
Support, fair water cone and current collector cylinder are welded；The silencer cylinder by second flange, connecting plate and third flange welding and
At；Current collector and silencer cylinder are to connect by welding, and equipped with the noise reduction wall that can be extracted out in silencer cylinder, noise reduction is within the walls
It is that glass wool cloth wraps up glass silk flosssilk wadding to have quieter material, the quieter material eliminated the noise within the walls, and noise elimination wall is fixed by perforated plate
Welding fabrication；The side air admission mouth is supported into air duct, side air inlet orifice plate, guide shell and side air inlet by the 4th flange, side
It is welded；The side air inlet orifice plate is punch forming part, and middle part is plane, and periphery is spherical surface, is had on the air inlet orifice plate of side
Several apertures；Side, which is entered the wind orifice plate and entered the wind in the cavity between velar plate, is filled with quieter material, and deadener is glass fiber
Cloth wraps up glass fiber cotton；The side air admission mouth is connected on silencer cylinder by second flange；The noise elimination wall
Be by third flanged joint on silencer cylinder, remove noise reduction wall it is i.e. capable of washing or replace quieter material.
According to above-described ultra-low noise quo of local Fan for Mine, it is characterised in that：The noise reduction of the noise reduction within the walls
Material is that foaming deadener is fixed by steel plate lead frame；In cavity between the side air inlet orifice plate and air inlet velar plate
The deadener of filling is foaming deadener.In addition, above-described quieter material can also be other noise reductions such as silencing cotton
Material.
According to above-described ultra-low noise quo of local Fan for Mine, it is characterised in that：The air inlet velar plate is to use
Screw is fixed on the 4th flange, and the quieter material filled in cavity can be cleaned or replace by removing air inlet velar plate.
Compared with the prior art, the invention has the advantages that：Outside noise main source and host when existing blower fan work
The radiated noise and import noise of shell, are connected and fixed by elastic material between inner casing and shell of the present invention, are considerably reduced
The radiated noise of host housing；Suction muffler is changed by area of section, is expanded or is shunk suddenly by means of pipeline section, makes
Sound wave along certain frequencies of pipe transmmision reflects back at mutation to Sounnd source direction, to achieve the purpose that once to eliminate the noise；
There is the noise reduction wall that can be extracted out in import silencer, when sound wave enters noise elimination wall, a part of acoustic energy is in the gap of porous material
It rubs and is converted to thermal energy consumption and dissipates, to reach secondary noise elimination purpose；Noise reduction wall can very easily be taken out after being blocked by dust
Go out cleaning or replacement, keeps erasure effect, repair time short；Acoustic wave segment at sound source reaches the side air inlet on side air admission mouth
After orifice plate, a part is reflected back toward Sounnd source direction, and another part is absorbed by deadener, to reach purpose of eliminating the noise three times.
Description of the drawings
Fig. 1 is equipped with the schematic diagram of the ultra-low noise quo of local Fan for Mine of two-stage main body machine 2；
Fig. 2 is the structural schematic diagram of ultra-low noise quo of local Fan for Mine main body of embodiment of the present invention machine 2；
Fig. 3 is the structural schematic diagram of Fig. 2 motors 13, impeller 11, inner casing 5；
Fig. 4 is the structural schematic diagram of suction muffler of the embodiment of the present invention 3；
Fig. 5 is the structural schematic diagram that each components of Fig. 4 link together；
Icon explanation：1. exit silencer；2. main body；3. suction muffler；4. shell；5. inner casing；On 6.
Shell；7. lower housing；8. rubber slab；9. rubber bar；10. rubber pad；11. impeller；Inner casing before 12.；13. motor；
Inner casing after 14.；15. anti-rotation sheet.31. current collector；32. noise reduction wall；33. silencer；34. side air admission mouth；35.
Enter the wind velar plate；36. first flange；37. fair water cone supports；38. fair water cone；39. current collector cylinder；40. connecting plate；41.
Third flange；43. second flange；44. the 4th flange；45. side is into air duct；46. cavity；47. orifice plate is entered the wind in side；48.
Guide shell；49. side air inlet support.
Specific implementation mode
Fig. 1 is equipped with the schematic diagram of the ultra-low noise quo of local Fan for Mine of two-stage main body machine 2；Fig. 2 is implementation of the present invention
The structural schematic diagram of example ultra-low noise quo of local Fan for Mine main body machine 2；Fig. 3 is the structure of Fig. 2 motors 13, impeller 11, inner casing 5
Schematic diagram；Ultra-low noise quo of local Fan for Mine of the present invention, including exit silencer 1, main body 2, suction muffler 3, it is special
Sign is：Main body 2 includes motor 13, impeller 11, inner casing 5, shell 4, and the inner casing 5 includes preceding inner casing 12, rear inner casing
14, the shell 4 includes upper shell 6, lower housing 7, has impeller 11 in preceding inner casing 12, there is motor 13 in rear inner casing 14, electricity
There is flange, preceding inner casing 12 and rear inner casing 14 to be connect respectively with motor 13 by flange on machine 13, preceding inner casing 12 with it is rear in
Flanged joint is used between casing 14；There is anti-rotation sheet 15 on inner casing 14, it is solid by several rubber bars 9 between inner casing 5 and shell 4
It is scheduled on together；There are two rubber slab 8 on lower housing 7, rubber slab 8 is contacted with anti-rotation sheet 15 prevents inner casing 14 from rotating；Upper
Shell 6,7 both ends of lower housing flange inner face on have a rubber pad 10, rubber pad 10 limits inner casing 5 and is axially moved；Upper shell 6, under
Shell 7 is bolted, and is sealed in conjunction with face paste PE gaskets；Fig. 4 is the structural representation of suction muffler of the embodiment of the present invention 3
Figure；Fig. 5 is the structural schematic diagram that each components of Fig. 4 link together；The suction muffler 3 includes current collector 31, noise reduction wall
32, silencer cylinder 33, side air admission mouth 34 and air inlet velar plate 35, the current collector 31 is by first flange 36, fair water cone branch
Support 37, fair water cone 38 and current collector cylinder 39 are welded；The silencer cylinder 33 is by second flange 43, connecting plate 40 and third
Flange 41 is welded；Current collector 31 and silencer cylinder 33 are to connect by welding, and being equipped in silencer cylinder 33 can take out
The noise reduction wall 32 gone out has quieter material in noise reduction wall 32, and the quieter material in the noise elimination wall 32 is that glass wool cloth wraps up glass
Glass silk flosssilk wadding, noise elimination wall 32 fix welding fabrication by perforated plate；The side air admission mouth 34 is by the 4th flange 44, side into air duct
45, side air inlet orifice plate 47, guide shell 48 and side air inlet support 49 are welded；The side air inlet orifice plate 47 is punch forming
Part, middle part are plane, and periphery is spherical surface, has several apertures on the air inlet orifice plate 47 of side；Enter the wind orifice plate 47 and air inlet lid in side
Quieter material is filled in cavity 46 between plate 35, deadener is that glass wool cloth wraps up glass silk flosssilk wadding；It is described it is lateral into
Air port 34 is connected on silencer cylinder 33 by second flange 43；The noise elimination wall 32 is connected by third flange 41
On silencer cylinder 33, remove noise reduction wall 32 it is i.e. capable of washing or replace quieter material.
According to above-described ultra-low noise quo of local Fan for Mine, it is characterised in that：Disappearing in the noise reduction wall 32
Sound material is that foaming deadener is fixed by steel plate lead frame；Between the side air inlet orifice plate 47 and air inlet velar plate 35
The deadener filled in cavity 46 is foaming deadener.In addition, above-described quieter material can also be silencing cotton etc.
Other quieter materials.
According to above-described ultra-low noise quo of local Fan for Mine, it is characterised in that：The air inlet velar plate 35 is
It is screwed on the 4th flange 44, removing air inlet velar plate 35 can noise reduction capable of washing or replacing filling in cavity 46
Material.
When blower fan work, the noise major part that impeller generates is propagated, partial noise because of the blocking of inner casing 5 along air duct
Acoustic bridge effect will not be formed since inside and outside casing is not rigidly connected to external radiation by inner casing 5, the noise radiated
Consumption is further reflected by outer cage, therefore, appearing the noise of outer cage can significantly reduce, and considerably reduce fan noise.
Present invention pipeline section area at fair water cone 38, current collector cylinder 39, guide shell 48 becomes smaller, other position pipelines are cut
Face area is big, expands or shrinks suddenly by means of pipeline section, make the sound waves of certain frequencies along pipe transmmision at mutation to
Sounnd source direction reflects back, to achieve the purpose that once to eliminate the noise；There is the noise reduction wall 32 that can be extracted out in import silencer 3, works as sound
When wave enters noise elimination wall, a part of acoustic energy rubs in the gap of porous material and is converted to thermal energy consumption and dissipates, to reach two
Secondary noise elimination purpose；Noise reduction wall 32 can very easily extract cleaning or replacement out after being blocked by dust, keep erasure effect, when maintenance
Between it is short；After acoustic wave segment at sound source reaches the side air inlet orifice plate 47 on side air admission mouth 34, a part is reflected back toward sound source side
To another part is absorbed by deadener, to reach purpose of eliminating the noise three times.
The present embodiment illustrates two-stage main body 2, and ultra-low noise quo of local Fan for Mine of the present invention can also be equipped with single
The wind turbine of grade main body or the above quantity main body of two-stage.
Claims (4)
1. a kind of ultra-low noise quo of local Fan for Mine, including exit silencer, main body, suction muffler, it is characterised in that：
Main body includes motor, impeller, inner casing, shell, and the inner casing includes preceding inner casing, rear inner casing, and the shell includes upper casing
Body, lower housing have impeller in preceding inner casing, there is motor in rear inner casing, there is flange, preceding inner casing and rear inner casing point on motor
It is not connect with motor by flange, there is anti-rotation sheet on inner casing, one is fixed on by several rubber bars between inner casing and shell
It rises；There are two rubber slab on lower housing, rubber slab is contacted with anti-rotation sheet prevents inner casing from rotating；In upper shell, lower housing two
There are rubber pad, rubber pad to limit inner casing and be axially moved on the flange inner face at end；Upper shell, lower housing are bolted, in conjunction with
Face paste gasket seals.
2. ultra-low noise quo of local Fan for Mine according to claim 1, it is characterised in that：The suction muffler packet
Current collector, noise reduction wall, silencer cylinder, side air admission mouth and air inlet velar plate are included, the current collector is by first flange, fair water cone
Support, fair water cone and current collector cylinder are welded；The silencer cylinder by second flange, connecting plate and third flange welding and
At；Current collector and silencer cylinder are to connect by welding, and equipped with the noise reduction wall that can be extracted out in silencer cylinder, noise reduction is within the walls
It is that glass wool cloth wraps up glass silk flosssilk wadding to have quieter material, the quieter material of the noise reduction within the walls, and noise reduction wall is fixed by perforated plate
Welding fabrication；The side air admission mouth is supported into air duct, side air inlet orifice plate, guide shell and side air inlet by the 4th flange, side
It is welded；The side air inlet orifice plate is punch forming part, and middle part is plane, and periphery is spherical surface, is had on the air inlet orifice plate of side
Several apertures；Side, which is entered the wind orifice plate and entered the wind in the cavity between velar plate, is filled with quieter material, and quieter material is glass fiber
Cloth wraps up glass fiber cotton；The side air admission mouth is connected on silencer cylinder by second flange；The noise reduction wall
Be by third flanged joint on silencer cylinder, remove noise reduction wall it is i.e. capable of washing or replace quieter material.
3. ultra-low noise quo of local Fan for Mine according to claim 2, it is characterised in that：The noise reduction disappearing within the walls
Sound material is that foaming quieter material is fixed by steel plate lead frame；Cavity between the side air inlet orifice plate and air inlet velar plate
The quieter material of interior filling is foaming quieter material.
4. ultra-low noise quo of local Fan for Mine according to claim 2 or 3, it is characterised in that：The air inlet lid
Plate is screwed on the 4th flange, and the noise reduction material filled in cavity can be cleaned or replace by removing air inlet velar plate
Material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610918954.XA CN106321474B (en) | 2016-10-21 | 2016-10-21 | A kind of ultra-low noise quo of local Fan for Mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610918954.XA CN106321474B (en) | 2016-10-21 | 2016-10-21 | A kind of ultra-low noise quo of local Fan for Mine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106321474A CN106321474A (en) | 2017-01-11 |
| CN106321474B true CN106321474B (en) | 2018-10-09 |
Family
ID=57817999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610918954.XA Active CN106321474B (en) | 2016-10-21 | 2016-10-21 | A kind of ultra-low noise quo of local Fan for Mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106321474B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976393A (en) * | 1975-08-27 | 1976-08-24 | Candaian Hurricane Equipment Ltd | Portable fan housing |
| US4508486A (en) * | 1982-05-28 | 1985-04-02 | Peabody Abc Corporation | Ventilation fan with noise-attenuating housing |
| KR100340025B1 (en) * | 1999-08-16 | 2002-06-10 | 삼남테크 주식회사 | A both direction ventilated system |
| DE102004041696B4 (en) * | 2004-08-28 | 2006-11-30 | Wolter Gmbh & Co. Kg | Jetventilator |
| CN101749285A (en) * | 2010-01-15 | 2010-06-23 | 汪祥 | Fan with silencer |
| CN202732502U (en) * | 2012-08-29 | 2013-02-13 | 湖南腾邦重工设备有限公司 | Mining pneumatic draw-out type local fan |
| DE202013105734U1 (en) * | 2013-12-17 | 2014-02-04 | Korfmann Lufttechnik GmbH | Soundproofing for a fan |
| CN105782090A (en) * | 2016-04-26 | 2016-07-20 | 浙江理工大学 | Noise-lowering and vortex-reducing axial flow fan |
| CN106015052A (en) * | 2016-07-19 | 2016-10-12 | 山西巨龙风机有限公司 | Mining counter-rotating short-shaft main ventilator |
| CN206111630U (en) * | 2016-10-21 | 2017-04-19 | 山西巨龙风机有限公司 | Mining auxiliary ventilating fan of ultra -low noise |
-
2016
- 2016-10-21 CN CN201610918954.XA patent/CN106321474B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106321474A (en) | 2017-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106321474B (en) | A kind of ultra-low noise quo of local Fan for Mine | |
| CN209638114U (en) | A kind of coal mine axis stream booster honeycomb silencer | |
| CN206111630U (en) | Mining auxiliary ventilating fan of ultra -low noise | |
| CN210956141U (en) | Sound-insulation noise-reduction layer structure and high-pressure air blower air duct with same | |
| CN115467843A (en) | Novel mining axial-flow fan of detachable low noise structure | |
| CN105317755A (en) | Efficient and multistage micropunch fan silencer | |
| CN108895036A (en) | Muffler | |
| CN212985634U (en) | Silencer of centrifugal fan | |
| CN205299555U (en) | Magnetic rotating formula sound wave ash remover | |
| CN213811116U (en) | Ventilation and noise reduction device for blower room | |
| CN204243498U (en) | A kind of silence switch station | |
| CN207328750U (en) | A kind of conformal formula acoustic hood of ship | |
| CN207920921U (en) | A kind of axis stream booster elbow intake silencer | |
| CN206152602U (en) | Kitchen garbage exhaust treatment device | |
| CN106593597A (en) | Heat dissipation, silencing and smoke removal device of diesel generating set | |
| CN205370686U (en) | Water -cooled noise eliminator | |
| CN210978006U (en) | Silencer for centrifugal ventilator | |
| CN104653518A (en) | Vertical fan silencer | |
| CN213270384U (en) | Energy-conserving silence hypsokinesis type fan | |
| CN217502068U (en) | Nitrogen fan sealed by carbon ring and used for achieving near zero leakage | |
| CN108194395A (en) | A kind of axis stream booster elbow intake silencer | |
| CN211264950U (en) | High-efficient steam noise silencing device | |
| CN212106385U (en) | High-strength noise-reduction centrifugal fan | |
| CN213419477U (en) | High-stability plastic fan shell with noise elimination coating | |
| CN209587418U (en) | A kind of building HVAC airflow muffler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |