CN110821545A - Self-silencing axial flow fan ventilation system for tunnel - Google Patents
Self-silencing axial flow fan ventilation system for tunnel Download PDFInfo
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- CN110821545A CN110821545A CN201911222547.5A CN201911222547A CN110821545A CN 110821545 A CN110821545 A CN 110821545A CN 201911222547 A CN201911222547 A CN 201911222547A CN 110821545 A CN110821545 A CN 110821545A
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- Prior art keywords
- silencing
- axial flow
- flow fan
- diffuser
- shaped shell
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- 238000009423 ventilation Methods 0.000 title claims abstract description 63
- 230000030279 gene silencing Effects 0.000 claims abstract description 107
- 230000008030 elimination Effects 0.000 claims description 17
- 238000003379 elimination reaction Methods 0.000 claims description 17
- 239000011491 glass wool Substances 0.000 claims description 7
- 239000011358 absorbing material Substances 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 230000001464 adherent effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 10
- 230000003584 silencer Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000013016 damping Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
-
- 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
- F04D29/002—Details, component parts, or accessories 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ventilation (AREA)
Abstract
The invention discloses a self-silencing axial flow fan ventilation system for a tunnel, and belongs to the technical field of tunnel ventilation equipment. The tunnel type air conditioner comprises a fan room, an air outlet channel and ventilation equipment, wherein an air inlet communicated with the tunnel is formed in one side of the fan room, and the air outlet channel vertically communicated with the ground is formed in the other side of the fan room; the ventilation equipment comprises an air valve, a silencing current collector, an axial flow fan and a silencing diffuser; the structure of the silencing current collector and the silencing diffuser are the same, and the silencing current collector and the silencing diffuser are composed of a horn-shaped shell, an adherence silencing layer, a left vertical silencing sheet, a right vertical silencing sheet, a left horizontal silencing sheet and a right horizontal silencing sheet. The silencer, the current collector and the diffuser which are required to be combined before are replaced by adopting the silencing current collector and the silencing diffuser, so that the integral installation length of the ventilation system of the axial flow fan is shortened, the installation space of the ventilation system of the axial flow fan is reduced, the civil engineering workload of a fan room is reduced, and the integral manufacturing cost of the ventilation system is reduced.
Description
Technical Field
The invention relates to a self-silencing axial flow fan ventilation system for a tunnel, and belongs to the technical field of tunnel ventilation equipment.
Background
At present, the main ventilation mode of the long and large tunnel adopts an axial flow fan for ventilation. The ventilation system of the axial flow fan is arranged from the air inlet direction to the air outlet direction and sequentially comprises an air valve, a silencer, a current collector, the axial flow fan, a diffuser, a silencer and the like, and inlet air enters the silencer for silencing from the air valve, enters the axial flow fan through the current collector, is diffused through the diffuser and is exhausted through the second silencer for silencing. The collector and the diffuser are identical in structure and are of horn-shaped structures, the installation directions of the collector and the diffuser are opposite, the large opening end of the collector is used for air inlet, the small opening end of the collector is used for air outlet, the small opening end of the diffuser is used for air inlet, and the large opening end of the diffuser is used for air outlet. The configuration occupies large installation space, the system ventilation pipeline is long, the system ventilation resistance is large, the installed power of the axial flow fan is high, the equipment configuration is complex, the purchase cost is high, and the civil engineering quantity is large.
In order to reduce the volume of the whole equipment and reduce the civil engineering quantity, a self-silencing type axial flow fan ventilation system for the tunnel is designed, a silencer and a diffuser, the silencer and a current collector are structurally fused, and the volume occupied by the silencer is reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a tunnel is with self-noise reduction type axial fan ventilation system, it has solved the axial fan ventilation system in present tunnel and has occupied the volume too big, and the civil engineering work volume is big, the problem that construction cost is high.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a self-muffling axial flow fan ventilation system for a tunnel comprises a fan room, an air outlet channel and ventilation equipment, wherein an air inlet communicated with the tunnel is formed in one side of the fan room, and the air outlet channel vertically communicated with the ground is formed in the other side of the fan room;
the ventilation equipment comprises an air valve, a silencing current collector, an axial flow fan and a silencing diffuser;
the air inlet end of the air valve is connected with the air inlet of the fan room, and the air outlet end of the air valve is connected with the air inlet end of the silencing current collector;
the air outlet end of the silencing current collector is connected with the air inlet end of the axial flow fan through flexible connection;
the air outlet end of the axial flow fan is connected with the air inlet end of the noise elimination diffuser through flexible connection;
the air outlet end of the silencing diffuser is connected with the bottom opening of the air outlet channel;
the structure of the silencing current collector and the silencing diffuser are the same, and the silencing current collector and the silencing diffuser are composed of a horn-shaped shell, an adherence silencing layer, a left vertical silencing sheet, a right vertical silencing sheet, a left horizontal silencing sheet and a right horizontal silencing sheet;
a first connecting flange is arranged at the small opening end of the horn-shaped shell, a second connecting flange is arranged at the large opening end of the horn-shaped shell, and an adherence silencing layer is fixed on the inner wall of the horn-shaped shell;
a left vertical type silencing piece and a right vertical type silencing piece are vertically fixed in the horn-shaped shell, a left horizontal silencing piece is fixed between the middle part of the left vertical type silencing piece and the horn-shaped shell, a right horizontal silencing piece is fixed between the middle part of the right vertical type silencing piece and the horn-shaped shell, and the inner cavity of the horn-shaped shell is divided into five silencing channels by the left vertical type silencing piece, the right vertical type silencing piece, the left horizontal silencing piece and the right horizontal silencing piece;
the large-opening end of the silencing current collector is an air inlet end, and the small-opening end of the silencing diffuser is an air inlet end;
the axial flow fan is fixed on the ground of the fan room through the mounting bracket, and the small-opening ends of the noise elimination collector and the noise elimination diffuser are respectively fixed on the ground at the two ends of the axial flow fan through the independent reinforcing brackets.
As a preferred example, the adherent noise-damping layer is made of a galvanized perforated plate sound-absorbing material.
As a preferable example, the left vertical type silencing piece, the right vertical type silencing piece, the left horizontal silencing piece and the right horizontal silencing piece are all made of ultra-fine glass wool sound absorption materials.
As a preferable example, the first connecting flange at the small opening end of the trumpet-shaped shell adopts a circular flange, the second connecting flange at the large opening end of the trumpet-shaped shell adopts a rectangular flange, and the trumpet-shaped shell smoothly transits from the circular flange to the rectangular flange.
As a preferred example, the trumpet-shaped shell is formed by splicing a left half shell and a right half shell through a splicing flange in the middle.
As a preferable example, the top of the air outlet channel is provided with a ventilation chamber, the side surface of the ventilation chamber is provided with a ventilation shutter, and the inner side of the ventilation shutter is provided with a filter screen.
The invention has the beneficial effects that:
(1) the muffler, the current collector and the diffuser which are required to be combined before are replaced by the silencing current collector and the silencing diffuser, so that the integral installation length of the ventilation system of the axial flow fan is shortened, the installation space of the ventilation system of the axial flow fan is reduced, the civil engineering workload of a fan room is reduced, and the integral manufacturing cost of the ventilation system is reduced;
(2) the shortened installation length of the ventilation system also means the shortened air circulation path, the air flow resistance of the ventilation system is reduced, the distribution power of the axial flow fan can be correspondingly reduced, and the overall cost and the operation energy consumption of the ventilation system are reduced, so that the benefits can be obtained in the aspects of the manufacturing cost of the ventilation system of the axial flow fan, the civil engineering quantity and the operation cost of the ventilation system.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the construction of the ventilating device;
FIG. 3 is a schematic view of the appearance of the noise damping current collector;
FIG. 4 is a schematic structural view of the appearance of the noise-damping diffuser;
FIG. 5 is a schematic structural view of a small-mouth end of a horn-shaped housing;
fig. 6 is a schematic structural diagram of the large-mouth end of the trumpet-shaped shell.
In the figure: the air conditioner comprises a fan room 1, an air outlet channel 2, an air valve 3, a noise elimination collector 4, an axial flow fan 5, a noise elimination diffuser 6, a flexible connection 7, a horn-shaped shell 8, a first connecting flange 81, a second connecting flange 82, an adherence noise elimination layer 9, a left vertical noise elimination sheet 10, a right vertical noise elimination sheet 11, a left horizontal noise elimination sheet 12, a right horizontal noise elimination sheet 13, a mounting bracket 14, a reinforcing bracket 15, a splicing flange 16, a ventilation chamber 17, a ventilation shutter 18 and an air inlet 19.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easy to understand, the invention is further described with reference to the specific drawings.
The expressions "left" and "right" in the following description mean the left and right in the small end view of the horn housing 8.
As shown in fig. 1-6, a self-muffling axial flow fan ventilation system for a tunnel comprises a fan room 1, an air outlet channel 2 and ventilation equipment, wherein one side of the fan room 1 is provided with an air inlet 19 communicated with the tunnel, and the other side of the fan room 1 is provided with the air outlet channel 2 vertically communicated with the ground;
the ventilation equipment comprises an air valve 3, a silencing current collector 4, an axial flow fan 5 and a silencing diffuser 6;
the air inlet end of the air valve 3 is connected with the air inlet 19 of the fan room 1, and the air outlet end of the air valve 2 is connected with the air inlet end of the silencing current collector 4;
the air outlet end of the silencing current collector 4 is connected with the air inlet end of the axial flow fan 5 through a flexible connection 7;
the air outlet end of the axial flow fan 5 is connected with the air inlet end of the silencing diffuser 6 through a flexible connection 7;
the air outlet end of the noise elimination diffuser 6 is connected with the bottom opening of the air outlet channel 2;
the silencing current collector 4 and the silencing diffuser 6 have the same structure and are composed of a horn-shaped shell 8, an adherence silencing layer 9, a left vertical silencing sheet 10, a right vertical silencing sheet 11, a left horizontal silencing sheet 12 and a right horizontal silencing sheet 13;
a first connecting flange 81 is arranged at the small opening end of the horn-shaped shell 8, a second connecting flange 82 is arranged at the large opening end of the horn-shaped shell 8, and an adherence silencing layer 9 is fixed on the inner wall of the horn-shaped shell 8;
a left vertical type silencing piece 10 and a right vertical type silencing piece 11 are vertically fixed in the horn-shaped shell 8, a left horizontal silencing piece 12 is fixed between the middle part of the left vertical type silencing piece 10 and the horn-shaped shell 8, a right horizontal silencing piece 13 is fixed between the middle part of the right vertical type silencing piece 11 and the horn-shaped shell 8, and the inner cavity of the horn-shaped shell 8 is divided into five silencing channels by the left vertical type silencing piece 10, the right vertical type silencing piece 11, the left horizontal silencing piece 12 and the right horizontal silencing piece 13;
the big opening end of the silencing current collector 4 is an air inlet end, and the small opening end is an air outlet end; the small opening end of the silencing diffuser 6 is an air inlet end, and the large opening end is an air outlet end;
the axial flow fan 5 is fixed on the ground of the fan room 1 through a mounting bracket 14, and the small-opening ends of the noise elimination collector 4 and the noise elimination diffuser 6 are respectively fixed on the ground at the two ends of the axial flow fan 5 through independent reinforcing brackets 15.
The adherence noise elimination layer 9 is made of galvanized perforated plate sound absorption material. The galvanized perforated plate is used as a perforated plate resonance sound absorption structure, and has larger absorption near the structural resonance frequency.
The left vertical silencing sheet 10, the right vertical silencing sheet 11, the left horizontal silencing sheet 12 and the right horizontal silencing sheet 13 are all made of superfine glass wool sound absorption materials. The superfine glass wool (also called superfine glass felt) is used as a sound-absorbing material, has the advantages of light weight and good sound-absorbing effect, sound is transmitted into the sound-eliminating channel, sound waves enter the porous superfine glass wool, and the sound waves are subjected to viscous resistance in the superfine glass wool and simultaneously convert a part of sound wave energy into heat energy to be absorbed under the vibration friction action of the porous hole walls of the superfine glass wool, so that a better sound-eliminating effect is achieved.
The first connecting flange 81 at the small opening end of the horn-shaped shell 8 is a circular flange, the second connecting flange 82 at the large opening end of the horn-shaped shell is a rectangular flange, and the horn-shaped shell 8 is smoothly transited to the rectangular flange from the circular flange.
The trumpet-shaped shell 8 is formed by splicing a left half shell and a right half shell through a splicing flange 16 in the middle. The horn-shaped shell 8 is formed by splicing a left half shell and a right half shell, the volume of the assembled shell is small, and the horn-shaped shell can be more conveniently moved and assembled in the narrow tunnel fan room 1.
The top of the air outlet channel 2 is provided with a ventilation chamber 17, the side surface of the ventilation chamber 17 is provided with a ventilation shutter 18, and the inner side of the ventilation shutter 18 is provided with a filter screen (not shown in the figure).
The working principle is as follows:
the muffler, the current collector and the diffuser which are required to be used in combination before are replaced by the muffling current collector 4 and the muffling diffuser 6, so that the overall installation length of a ventilation system of the axial flow fan 5 is shortened, the installation space of the ventilation system of the axial flow fan 5 is reduced, the civil engineering workload of the fan room 1 is reduced, and the overall cost of the ventilation system is reduced;
the shortened installation length of the ventilation system also means the shortened air circulation path, the air flow resistance of the ventilation system is reduced, the distribution power of the axial flow fan 5 can be correspondingly reduced, and the overall cost and the operation energy consumption of the ventilation system are reduced, so that the benefits can be obtained in the aspects of the manufacturing cost of the ventilation system of the axial flow fan 5, the civil engineering quantity and the operation cost of the ventilation system.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides a tunnel is with self-silencing type axial fan ventilation system, it includes fan room, air-out passageway, ventilation equipment, fan room one side is equipped with the air intake with the tunnel intercommunication, and fan room opposite side is equipped with the air-out passageway of vertical and ground intercommunication, its characterized in that:
the ventilation equipment comprises an air valve, a silencing current collector, an axial flow fan and a silencing diffuser;
the air inlet end of the air valve is connected with the air inlet of the fan room, and the air outlet end of the air valve is connected with the air inlet end of the silencing current collector;
the air outlet end of the silencing current collector is connected with the air inlet end of the axial flow fan through flexible connection;
the air outlet end of the axial flow fan is connected with the air inlet end of the noise elimination diffuser through flexible connection;
the air outlet end of the silencing diffuser is connected with the bottom opening of the air outlet channel;
the structure of the silencing current collector and the silencing diffuser are the same, and the silencing current collector and the silencing diffuser are composed of a horn-shaped shell, an adherence silencing layer, a left vertical silencing sheet, a right vertical silencing sheet, a left horizontal silencing sheet and a right horizontal silencing sheet;
a first connecting flange is arranged at the small opening end of the horn-shaped shell, a second connecting flange is arranged at the large opening end of the horn-shaped shell, and an adherence silencing layer is fixed on the inner wall of the horn-shaped shell;
a left vertical type silencing piece and a right vertical type silencing piece are vertically fixed in the horn-shaped shell, a left horizontal silencing piece is fixed between the middle part of the left vertical type silencing piece and the horn-shaped shell, a right horizontal silencing piece is fixed between the middle part of the right vertical type silencing piece and the horn-shaped shell, and the inner cavity of the horn-shaped shell is divided into five silencing channels by the left vertical type silencing piece, the right vertical type silencing piece, the left horizontal silencing piece and the right horizontal silencing piece;
the large-opening end of the silencing current collector is an air inlet end, and the small-opening end of the silencing diffuser is an air inlet end;
the axial flow fan is fixed on the ground of the fan room through the mounting bracket, and the small-opening ends of the noise elimination collector and the noise elimination diffuser are respectively fixed on the ground at the two ends of the axial flow fan through the independent reinforcing brackets.
2. The self-muffling axial flow fan ventilation system for tunnels according to claim 1, wherein the adherent muffling layer is made of a galvanized perforated plate sound-absorbing material.
3. The self-muffling axial flow fan ventilation system for the tunnel according to claim 1, wherein the left vertical muffling sheet, the right vertical muffling sheet, the left horizontal muffling sheet and the right horizontal muffling sheet are all made of an ultra-fine glass wool sound-absorbing material.
4. The self-muffling axial flow fan ventilation system for the tunnel according to claim 1, wherein a circular flange is adopted as a first connecting flange at the small opening end of the trumpet-shaped shell, a rectangular flange is adopted as a second connecting flange at the large opening end of the trumpet-shaped shell, and the trumpet-shaped shell is smoothly transited from the circular flange to the rectangular flange.
5. The self-muffling axial flow fan ventilation system for the tunnel according to claim 1, wherein the trumpet-shaped shell is formed by splicing a left half shell and a right half shell through a splicing flange in the middle.
6. The self-muffling axial flow fan ventilation system for the tunnel according to claim 1, wherein a ventilation chamber is arranged at the top of the air outlet channel, a ventilation shutter is arranged on the side surface of the ventilation chamber, and a filter screen is arranged on the inner side of the ventilation shutter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222547.5A CN110821545A (en) | 2019-12-03 | 2019-12-03 | Self-silencing axial flow fan ventilation system for tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222547.5A CN110821545A (en) | 2019-12-03 | 2019-12-03 | Self-silencing axial flow fan ventilation system for tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110821545A true CN110821545A (en) | 2020-02-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911222547.5A Pending CN110821545A (en) | 2019-12-03 | 2019-12-03 | Self-silencing axial flow fan ventilation system for tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110821545A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065752A (en) * | 2020-09-14 | 2020-12-11 | 湖州南浔精优机械制造有限公司 | Diagonal flow type noise elimination fan device for advanced civil buildings |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4362223A (en) * | 1979-05-18 | 1982-12-07 | Irmhild Meier | Sound absorbing device |
| CN105041727A (en) * | 2015-08-25 | 2015-11-11 | 无锡华琳制冷机械有限公司 | Draught fan silencer |
| CN106640772A (en) * | 2016-11-23 | 2017-05-10 | 山西巨龙风机有限公司 | Draught fan for special grade low-noise tunnel construction |
| CN207064271U (en) * | 2017-05-12 | 2018-03-02 | 上海进贤机电科技有限公司 | A kind of axial flow blower ventilating system |
| CN211342993U (en) * | 2019-12-03 | 2020-08-25 | 上海进贤机电科技有限公司 | Self-silencing axial flow fan ventilation system for tunnel |
-
2019
- 2019-12-03 CN CN201911222547.5A patent/CN110821545A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4362223A (en) * | 1979-05-18 | 1982-12-07 | Irmhild Meier | Sound absorbing device |
| CN105041727A (en) * | 2015-08-25 | 2015-11-11 | 无锡华琳制冷机械有限公司 | Draught fan silencer |
| CN106640772A (en) * | 2016-11-23 | 2017-05-10 | 山西巨龙风机有限公司 | Draught fan for special grade low-noise tunnel construction |
| CN207064271U (en) * | 2017-05-12 | 2018-03-02 | 上海进贤机电科技有限公司 | A kind of axial flow blower ventilating system |
| CN211342993U (en) * | 2019-12-03 | 2020-08-25 | 上海进贤机电科技有限公司 | Self-silencing axial flow fan ventilation system for tunnel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065752A (en) * | 2020-09-14 | 2020-12-11 | 湖州南浔精优机械制造有限公司 | Diagonal flow type noise elimination fan device for advanced civil buildings |
| CN112065752B (en) * | 2020-09-14 | 2022-05-13 | 佛山市珠江风机有限公司 | Diagonal flow type noise elimination fan device for advanced civil buildings |
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