CN114251308A - Large-scale ventilation blower convenient to clearance flabellum - Google Patents
Large-scale ventilation blower convenient to clearance flabellum Download PDFInfo
- Publication number
- CN114251308A CN114251308A CN202210190051.XA CN202210190051A CN114251308A CN 114251308 A CN114251308 A CN 114251308A CN 202210190051 A CN202210190051 A CN 202210190051A CN 114251308 A CN114251308 A CN 114251308A
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- fixed
- brush
- air inlet
- fan
- fan blade
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Classifications
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- 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
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a large-scale ventilator convenient for cleaning fan blades, which relates to the technical field of industrial ventilation equipment.A brush plate has the same width as a grid rod in an air inlet filtering baffle net, is movably arranged between the fan blades and the air inlet filtering baffle net, and is connected with a central disc of the air inlet filtering baffle net by utilizing a scissor type expansion bracket; one end of each steel brush is fixed on the brush plate, and the other end of each steel brush is movably contacted with the side wall of the fan blade; one end of the electric telescopic rod is fixed on the central disc of the air inlet filtering baffle net, and the other end of the electric telescopic rod is connected and fixed with the brush plate by utilizing the floating joint; the time controller is fixed on the side wall of the gear motor box and is electrically connected with the gear motor and the electric telescopic rod respectively. The time controller is adopted, the fan blades are cleaned intelligently, complete shutdown is not needed, automatic cleaning of the fan blades can be achieved, efficiency is high, and applicability is wide.
Description
Technical Field
The invention relates to the technical field of industrial ventilation equipment, in particular to a large-scale ventilator convenient for cleaning fan blades.
Background
The ventilator is a machine which increases the pressure of gas and discharges the gas by means of input mechanical energy, and is a driven fluid machine. In industrial production, it is generally necessary to increase the air flow circulation inside a production plant by using a ventilator to ensure a good production environment.
Because the fan adopts gear motor to drive the flabellum rotatory to drive the air current circulation. After long-term use, dust can be collected on the fan blades, so that the appearance is not affected, and the fan blades can be corroded after long-term use. To this problem, generally adopt the manual work to dismantle the clearance of carrying out the flabellum at present, it need shut down completely just can clear up, not only influences the ventilation effect, still extravagant manpower.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a large ventilator convenient for cleaning fan blades.
In order to achieve the purpose, the invention adopts the following technical scheme: the wind power generation device comprises supporting legs, a ventilation case, a wind inlet filtering baffle net, fan blades, a speed reduction motor case, a speed reduction motor, a transmission pair and a bearing seat; the bottom of the ventilation case is fixed with a plurality of support legs, the top of the ventilation case is fixed with a speed reduction motor case, the speed reduction motor is arranged in the speed reduction motor case, the speed reduction motor is connected with a central shaft of a fan blade by a transmission pair, the central shaft of the fan blade is screwed on a bearing seat by a bearing, the bearing seat is fixed in the ventilation case, and the transmission pair is arranged in the top wall of the ventilation case in a penetrating manner; the air inlet filtering baffle net is fixed in one port of the ventilation case and is arranged adjacent to the fan blades; it also includes:
the width of the brush plate is the same as that of the grating rod in the air inlet filtering baffle net, the brush plate is movably arranged between the fan blades and the air inlet filtering baffle net and is connected with a central disc of the air inlet filtering baffle net by utilizing a scissor type telescopic frame;
the number of the steel brushes is a plurality, one ends of the steel brushes are fixed on the brush plate, and the other ends of the steel brushes are movably contacted with the side wall of the fan blade;
one end of the electric telescopic rod is fixed on the central disc of the air inlet filtering baffle net, and the other end of the electric telescopic rod is connected and fixed with the brush plate by utilizing the floating joint;
and the time controller is fixed on the side wall of the gear motor box and is electrically connected with the gear motor and the electric telescopic rod respectively.
Preferably, the support legs at two ends of the scissor type telescopic frame are both connected with guide shafts, the two guide shafts arranged on the support legs at one end of the central disc of the air inlet filtering baffle net are movably arranged in a first sliding groove, the first sliding groove is arranged at one side of a first abdicating groove and is communicated with the first abdicating groove, and the first sliding groove and the first abdicating groove are both arranged in the central disc; two guide shafts arranged on the support leg at one end of the brush plate are movably arranged in the second sliding groove, the second sliding groove is arranged on one side of the second yielding groove and is communicated with the second yielding groove, and the two guide shafts are arranged in the brush plate.
Preferably, a plurality of groove bodies are arranged in one side wall, adjacent to the fan blades, of the brush plate, a steel brush fixing plate is movably embedded in each groove body, a silica gel strip is filled in a space between the steel brush fixing plate and the inner side wall of each groove body, and the steel brushes are fixed on the steel brush fixing plate.
Preferably, an air outlet filtering baffle net is fixed in one end of the ventilation machine case adjacent to the bearing seat.
Preferably, the bottom wall of the ventilation case is provided with a collecting box in a through connection at a position below the fan blades, the collecting box is of an arc-shaped structure, a discharging cover is screwed in an opening at the bottom of the collecting box through a rotating shaft, and the other end of the discharging cover is detachably fixed with the collecting box through a hasp.
Preferably, the bottom end of the supporting leg is fixed with a universal wheel with a lock.
The working principle of the invention is as follows: before use, the ventilation working time and the cleaning working time of the speed reducing motor are set in the time controller, then the time controller is put into use, after the set ventilation working time is reached, the rotating speed of the speed reducing motor is controlled to be reduced, meanwhile, the electric telescopic rod is controlled to extend out, when the electric telescopic rod extends out to the maximum stroke, the steel brush is contacted with the fan blade, at the moment, the electric telescopic rod stops, the fan blade rotates at a low speed under the low-speed operation of the speed reducing motor, in the rotating process, a certain amount of ventilation effect is achieved, dust adhered to the fan blade is brushed away by the steel brush, when the set cleaning working time is reached, the electric telescopic rod is started again to retract, so that the brush plate is driven to move towards the direction far away from the fan blade, finally, the brush plate and the steel brush are brought to the inner side of the air inlet filter blocking net and are attached to the grid rod in the vertical direction, meanwhile, the rotating speed of the speed reducing motor is increased again, and (5) the rotation speed is recovered to the rotation speed in the ventilation operation to continue the operation.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a large ventilator convenient for cleaning fan blades, which adopts a time controller to realize the intelligent cleaning of the fan blades, can realize the automatic cleaning of the fan blades without complete shutdown, and has high efficiency and wide applicability.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a sectional view taken along line a-a in fig. 1.
FIG. 3 is a schematic view of the inner side structure of the central disk of the air inlet filtering baffle net of the present invention.
FIG. 4 is a schematic view of the structure of the side wall of the brush plate according to the present invention.
FIG. 5 is a schematic view of the connection structure of the brush plate, the steel brush fixing plate and the steel brush according to the present invention.
Fig. 6 is a sectional view taken along line D-D in fig. 5.
Fig. 7 is an enlarged view of a portion B in fig. 2.
Fig. 8 is an enlarged view of the portion C in fig. 2.
Description of reference numerals:
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and the preferred embodiments in the description are only examples, and all other embodiments obtained by those skilled in the art without any inventive work belong to the protection scope of the present invention.
As shown in fig. 1 to 8, the following technical solutions are adopted in the present embodiment: the air inlet filter screen comprises supporting legs 1, a ventilation case 2, an air inlet filter screen 3, fan blades 4, a speed reduction motor case 5, a speed reduction motor 6, a transmission pair 7 and a bearing seat 9; the ventilating machine case 2 is of a horizontal cylindrical structure, four support legs 1 are fixedly welded at the bottom of the ventilating machine case 2, a speed reducing motor case 5 is integrally formed at the top of the ventilating machine case 2, the speed reducing motor 6 is arranged inside the speed reducing motor case 5, the speed reducing motor 6 is connected with a central shaft of a fan blade 4 through a transmission pair 7, the transmission pair 7 is of a belt wheel type structure (a transmission belt is matched with a belt wheel), a central shaft of the fan blade 4 is screwed on a bearing seat 9 through a bearing, the bearing seat 9 is fixedly welded inside the ventilating machine case 2, and the transmission pair 7 penetrates through the top wall of the ventilating machine case 2; the air inlet filtering baffle net 3 is fixedly connected into one port of the ventilation case 2 by screws and is arranged adjacent to the fan blades 4; it also includes:
the width of the brush plate 10 is the same as that of a grid rod in the air inlet filtering baffle net 3, so that the influence of the excessively wide brush plate 10 on the ventilation effect is avoided, the brush plate 10 is movably arranged between the fan blades 4 and the air inlet filtering baffle net 3, and the brush plate is connected with a central disc of the air inlet filtering baffle net 3 by utilizing a scissor type telescopic frame 13;
the steel brushes 11 are arranged, the number of the steel brushes 11 is a plurality of, three groove bodies are sequentially arranged in a side wall, adjacent to the fan blade 4, of the brush plate 10 from top to bottom, a steel brush fixing plate 16 is movably embedded in each groove body, inner end angles of the steel brush fixing plates 16 are arc-shaped chamfer structures, the phenomenon that the brush plate is stuck during displacement is avoided, a space between the steel brush fixing plate 16 and the inner side wall of each groove body is filled with a silica gel strip 17, one end of each steel brush 11 is fixedly welded on the steel brush fixing plate 16, and the other end of each steel brush 11 is movably contacted with the side wall of the fan blade 4;
one end of the electric telescopic rod 12 is fixed on a central disc of the air inlet filtering baffle net 3, and the other end of the electric telescopic rod 12 is fixedly connected with the brush plate 10 by a floating joint;
the time controller 18 is fixed on the side wall of the gear motor box 5, and the time controller 18 is electrically connected with the gear motor 6 and the electric telescopic rod 12 respectively;
the types of the speed reducing motor 6, the electric telescopic rod 12 and the time controller 18 can be purchased in the market according to actual use requirements, and an external power supply is adopted for supplying power (or an internal power supply can be selected and configured according to requirements).
As a preferred scheme, furthermore, the support legs at the two ends of the scissor-type telescopic frame 13 are both connected with guide shafts 13-1, the two guide shafts 13-1 arranged on the support legs at one end of the central disc of the air inlet filtering baffle net 3 are movably arranged in a first slide groove 3-2, the first slide groove 3-2 is arranged at one side of the first abdicating groove 3-1 and is mutually communicated with the first abdicating groove 3-1, and both the guide shafts are arranged in the central disc; two guide shafts 13-1 arranged on the support legs at one end of the brush plate 10 are movably arranged in a second sliding groove 10-2, the second sliding groove 10-2 is arranged on one side of the second abdicating groove 10-1 and is communicated with the second abdicating groove 10-1, the two guide shafts and the second abdicating groove are arranged in the brush plate 10, and the scissor type telescopic frame 13 is accommodated in the first abdicating groove 3-1 in the ventilation working process.
Preferably, an outlet filtering baffle net 8 is fixed in one end of the ventilator case 2 adjacent to the bearing seat 9 by screw connection.
Preferably, a collection box 14 is connected to the bottom wall of the ventilator case 2 at a position below the fan blades 4, the collection box 14 is an arc-shaped structure (the coverage area of the arc-shaped structure is slightly smaller than the arc of the lower wall of the ventilator case 2), a material discharge cover 15 is screwed into an opening at the bottom of the collection box 14 through a rotating shaft, and the other end of the material discharge cover 15 is detachably fixed to the collection box 14 through a buckle.
Preferably, a universal wheel 19 with a lock is fixed at the bottom end of the supporting leg 1 for moving the whole and locking the position.
The working principle of the specific embodiment is as follows: before use, the ventilation working time and the cleaning working time of the speed reducing motor 6 are set in the time controller 18, then the time controller is put into use, when the set ventilation working time is reached, the rotating speed of the speed reducing motor 6 is controlled to be reduced (the low speed ensures that the fan blade 4 can not cause excessive shearing force to the steel brush while rotating, and the specific rotating speed value can be determined according to the actual working requirement), meanwhile, the electric telescopic rod 12 is controlled to extend out, the output end of the electric telescopic rod 12 pushes the brush plate 10 to move towards the fan blade 4, when the electric telescopic rod 12 extends out to the maximum stroke, the steel brush 11 is contacted with the fan blade 4, because the surface of the fan blade 4 is not a flat structure, at the moment, the steel brush fixing plate 16 for fixing the steel brush generates adaptive displacement under the action of the silica gel strip 17 (the silica gel strip 17 has a certain deformation), so that the other end of the steel brush 11 is attached to the side wall of the fan blade 4, the fan blade 4 rotates at a low speed under the low-speed operation of the speed reducing motor 6, in the rotating process, a certain amount of ventilation effect is achieved, meanwhile, dust adhered to the fan blade 4 is brushed away by the steel brush 11, after the set cleaning working time is reached, the electric telescopic rod 12 is started again to retract, so that the brush plate 10 is driven to move towards the direction far away from the fan blade 4, finally, the brush plate 10 and the steel brush 11 are brought to the inner side of the air inlet filter baffle net 3 and are attached to the grid rods in the vertical direction, meanwhile, the speed reducing motor 6 increases the rotating speed again, and the rotating speed is restored to the rotating speed during the ventilation work to continue working;
after the steel brush 11 brushes off the dust, part of dust can drop in collecting box 14, and after a certain time, through opening discharge cover 15 and clear up the sedimentary dust, another part of dust can be driven by the air current and filtered and intercepted to air outlet filtration baffle net 8 department.
After adopting above-mentioned structure, this embodiment's beneficial effect is as follows:
1. the speed reduction motor is matched with the steel brush and the electric telescopic rod, so that dust adhered to the fan blades can be removed without stopping the machine, the ventilation efficiency is improved, and the service life of the fan blades is prolonged;
2. the air outlet filtering baffle net and the air inlet filtering baffle net are arranged for double filtering, so that the circulation of dust is effectively reduced, and the working environment is improved;
3. the arrangement of the collecting box effectively performs centralized cleaning on the deposited dust;
4. adopt mobilizable steel brush fixed plate of silica gel strip cooperation for the steel brush can be better the subsides clothes on the flabellum lateral wall, the flabellum of different styles of adaptation also provides certain supplementary margin for the wearing and tearing that the steel brush use took place simultaneously (namely, when the steel brush tip took place a small amount of wearing and tearing, it still contacted with the flabellum under the elastic action of silica gel strip), extension steel brush live time.
It will be appreciated by those skilled in the art that modifications and equivalents may be made to the embodiments described above, and that various modifications, equivalents, improvements and the like may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A large ventilator convenient for cleaning fan blades comprises supporting legs (1), a ventilator case (2), an air inlet filtering baffle net (3), fan blades (4), a reducing motor case (5), a reducing motor (6), a transmission pair (7) and a bearing seat (9); the bottom of the ventilation case (2) is fixed with a plurality of supporting legs (1), the top of the ventilation case (2) is fixed with a speed reduction motor case (5), a speed reduction motor (6) is arranged in the speed reduction motor case (5), the speed reduction motor (6) is connected with a central shaft of the fan blade (4) through a transmission pair (7), the central shaft of the fan blade (4) is screwed on a bearing seat (9) through a bearing, the bearing seat (9) is fixed in the ventilation case (2), and the transmission pair (7) penetrates through the top wall of the ventilation case (2); the air inlet filtering blocking net (3) is fixed in one port of the ventilation case (2) and is arranged adjacent to the fan blades (4);
it is characterized in that it also comprises:
the width of the brush plate (10) is the same as that of a grid rod in the air inlet filtering blocking net (3), the brush plate (10) is movably arranged between the fan blades (4) and the air inlet filtering blocking net (3), and the brush plate is connected with a central disc of the air inlet filtering blocking net (3) by a scissor type telescopic frame (13);
the number of the steel brushes (11) is a plurality, one ends of the steel brushes (11) are fixed on the brush plate (10), and the other ends of the steel brushes are movably contacted with the side wall of the fan blade (4);
one end of the electric telescopic rod (12) is fixed on a central disc of the air inlet filtering baffle net (3), and the other end of the electric telescopic rod (12) is fixedly connected with the brush plate (10) by a floating joint;
and the time controller (18) is fixed on the side wall of the gear motor box (5), and the time controller (18) is electrically connected with the gear motor (6) and the electric telescopic rod (12) respectively.
2. A large fan facilitating fan blade cleaning according to claim 1, wherein: the guide shafts (13-1) are connected to support legs at two ends of the scissor type telescopic frame (13), the two guide shafts (13-1) arranged on the support legs at one end of the central disc of the air inlet filtering blocking net (3) are movably arranged in the first sliding groove (3-2), the first sliding groove (3-2) is arranged on one side of the first abdicating groove (3-1) and is communicated with the first abdicating groove (3-1), and the first guiding shaft and the first abdicating groove are both arranged in the central disc; two guide shafts (13-1) arranged on the support legs at one end of the brush plate (10) are movably arranged in a second sliding groove (10-2), the second sliding groove (10-2) is arranged on one side of the second abdicating groove (10-1) and is communicated with the second abdicating groove (10-1), and the two guide shafts are arranged in the brush plate (10).
3. A large fan facilitating fan blade cleaning according to claim 1, wherein: a plurality of groove bodies are arranged in one side wall, adjacent to the fan blades (4), of the brush plate (10), a steel brush fixing plate (16) is movably embedded in each groove body, a space between the steel brush fixing plate (16) and the inner side wall of each groove body is filled with silica gel strips (17), and the steel brushes (11) are fixed on the steel brush fixing plate (16).
4. A large fan facilitating fan blade cleaning according to claim 1, wherein: and an air outlet filtering baffle net (8) is fixed in one end of the ventilation case (2) adjacent to the bearing seat (9).
5. A large fan facilitating fan blade cleaning according to claim 1, wherein: the fan is characterized in that a collecting box (14) is connected to the position below the fan blades (4) on the bottom wall of the ventilating case (2) in a penetrating mode, the collecting box (14) is of an arc-shaped structure, a discharging cover (15) is screwed into an opening in the bottom of the collecting box (14) through a rotating shaft, and the other end of the discharging cover (15) is detachably fixed with the collecting box (14) through a hasp.
6. A large fan facilitating fan blade cleaning according to claim 1, wherein: the bottom end of the supporting leg (1) is fixed with a universal wheel (19) with a lock.
7. The operating principle of a large ventilator convenient for cleaning fan blades as claimed in claim 1, wherein: before use, the ventilation working time and the cleaning working time of the speed reducing motor (6) are set in the time controller (18), then the time controller is put into use, after the set ventilation working time is reached, the rotating speed of the speed reducing motor (6) is controlled to be reduced, meanwhile, the electric telescopic rod (12) is controlled to be extended, the output end of the electric telescopic rod (12) pushes the brush plate (10) to move towards the fan blade (4), when the electric telescopic rod (12) is extended to the maximum stroke, the steel brush (11) is contacted with the fan blade (4), at the moment, the fan blade (4) realizes low-speed rotation under the low-speed operation of the speed reducing motor (6), in the rotating process, a certain ventilation effect is achieved, meanwhile, dust adhered to the fan blade (4) is brushed away by the steel brush (11), and after the set cleaning working time is reached, the electric telescopic rod (12) is started to retract again, thereby drive brush board (10) to the direction removal of keeping away from flabellum (4), finally take brush board (10) and steel brush (11) to the inboard of going into wind gap filtration fender net (3) and with the laminating of the grid pole on the vertical direction, meanwhile, gear motor (6) improve the rotational speed again, resume to the rotational speed when ventilating work and continue work, can.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190051.XA CN114251308A (en) | 2022-03-01 | 2022-03-01 | Large-scale ventilation blower convenient to clearance flabellum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190051.XA CN114251308A (en) | 2022-03-01 | 2022-03-01 | Large-scale ventilation blower convenient to clearance flabellum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114251308A true CN114251308A (en) | 2022-03-29 |
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ID=80800141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210190051.XA Pending CN114251308A (en) | 2022-03-01 | 2022-03-01 | Large-scale ventilation blower convenient to clearance flabellum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114251308A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013365A (en) * | 2022-07-29 | 2022-09-06 | 中煤科工集团重庆研究院有限公司 | Noise-reduction explosion-proof local ventilator for coal mine area |
| CN117345672A (en) * | 2023-11-17 | 2024-01-05 | 湖南新安特风机有限公司 | Intelligent temperature control fan |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207647864U (en) * | 2017-12-23 | 2018-07-24 | 福建京华电气设备有限公司 | A kind of heat emission fan dust-extraction unit of Intelligent comprehensive power distribution cabinet |
| CN108644137A (en) * | 2018-04-12 | 2018-10-12 | 李火章 | A kind of household fan of included cleaning function |
| CN211343513U (en) * | 2019-10-22 | 2020-08-25 | 嘉隆科技（深圳）有限公司 | Electric fan with cleaning structure |
| CN213270394U (en) * | 2020-10-10 | 2021-05-25 | 江阴市友邦家居用品有限公司 | Air purification axial fan subassembly and airing machine |
| CN215058354U (en) * | 2021-06-08 | 2021-12-07 | 青岛顺威精密塑料有限公司 | Axial fan with protective net cleaning mechanism |
-
2022
- 2022-03-01 CN CN202210190051.XA patent/CN114251308A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207647864U (en) * | 2017-12-23 | 2018-07-24 | 福建京华电气设备有限公司 | A kind of heat emission fan dust-extraction unit of Intelligent comprehensive power distribution cabinet |
| CN108644137A (en) * | 2018-04-12 | 2018-10-12 | 李火章 | A kind of household fan of included cleaning function |
| CN211343513U (en) * | 2019-10-22 | 2020-08-25 | 嘉隆科技（深圳）有限公司 | Electric fan with cleaning structure |
| CN213270394U (en) * | 2020-10-10 | 2021-05-25 | 江阴市友邦家居用品有限公司 | Air purification axial fan subassembly and airing machine |
| CN215058354U (en) * | 2021-06-08 | 2021-12-07 | 青岛顺威精密塑料有限公司 | Axial fan with protective net cleaning mechanism |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013365A (en) * | 2022-07-29 | 2022-09-06 | 中煤科工集团重庆研究院有限公司 | Noise-reduction explosion-proof local ventilator for coal mine area |
| CN117345672A (en) * | 2023-11-17 | 2024-01-05 | 湖南新安特风机有限公司 | Intelligent temperature control fan |
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Application publication date: 20220329 |
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| RJ01 | Rejection of invention patent application after publication |