CN105020986B - Heat-pump-type tail recuperation of heat penetrates adverse current fluidized dryer - Google Patents
Heat-pump-type tail recuperation of heat penetrates adverse current fluidized dryer Download PDFInfo
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- CN105020986B CN105020986B CN201510496272.XA CN201510496272A CN105020986B CN 105020986 B CN105020986 B CN 105020986B CN 201510496272 A CN201510496272 A CN 201510496272A CN 105020986 B CN105020986 B CN 105020986B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a kind of heat-pump-type tail recuperation of heat to penetrate adverse current fluidized dryer, and drying tower top is provided with material envelope feed screw, and bottom is provided with wind stopping device discharging machine；Drying tower top connects air-introduced machine, and air-introduced machine empties after the evaporator of cyclone dust collectors connection heat pump；The evaporator of heat pump connects main frame through refrigerant pipe, and main frame connects condenser through refrigerant pipe；The condensed device connection drying tower bottom in outlet side of air blower；The draught fan impeller has the structure that blade is hollow anti-water-drop-shaped；Air-introduced machine appearance profile line is involute.The present invention is by setting sieve aperture cone lid, sieve aperture to bore disk, material blanking tube, stretching vibration power transmission shaft and conical plug, it is ingenious, ideally realize to the penetrating of material, adverse current, boiling and fluidized drying, surmount the boiling counter-current drying pattern of classics completely, it is more energy efficient, dry mass is higher, blower fan power consumption is lower；Heat-pump-type tail recuperation of heat is particularly suitable for the relatively low heat recovery of exhaust temperature.
Description
Technical field
The present invention relates to a kind of dryer, refer specifically to air-introduced machine will not the heat-pump-type tail recuperation of heat of laying dust penetrate adverse current and fluidize
Drying machine.
Background technology
Drying of the drying temperature less than 60 degrees Celsius is typically turned into low temperature drying by people, and low temperature drying is widely used in making
The drying of the heat sensitive materials such as species, Chinese medicine, biological products.Hot air type drier due to technology maturation, it is adaptable,
Operating cost is low, highly reliable, is still one of preferred unit of low temperature drying.Low temperature drying due to exhaust emissions temperature compared with
It is low, thus it is more difficult enter end of line recuperation of heat.If it can be realized during hot air type low temperature drying inverse to the penetration of material
Stream fluidisation drying, and tail heat is effectively reclaimed, then it is especially heavy for improving drying efficiency and realizing that energy-saving and emission-reduction all have
The meaning wanted.
Air-introduced machine is the key equipment of heated air drier, and air-introduced machine is generally centrifugal blower, air-introduced machine it is continuous, steady
Calmly, reliably working is very crucial to the hydrofuge of drying machine, because the occasion that drying machine uses all contains certain dust mostly, draws
During blower fan work, air-flow during the draught fan impeller of high speed rotation by that can depart from air-flow phase due to centrifugation, dust granule
And deposit and be attached on draught fan impeller.
Because draught fan impeller rotating speed is general all higher, as long as with the presence of micro dust in air-flow, after working long hours all
More dust can be accumulated, so as to change the balance of draught fan impeller rotation, if draught fan impeller does not have self purification to dust
Also do not clear up in time, will static state cumulative and that draught fan impeller is altered in steps and dynamic equilibrium, so as to produce vibration.
Come off once the dust that running into has part hardened is vibrated, the dynamic rotary away from air-introduced machine will balance, then produce immediately
Judder, this may trigger serious personnel and equipment safety accident.
Therefore, if a kind of centrifugal type draught fan impeller can be designed, automatic cleaning can be carried out and just caused without worry
Dust accumulates, and all has especially important meaning for keeping the reliable and stable work of air-introduced machine and preventing security incident.
The content of the invention
The technical problem to be solved in the present invention is exactly overcome the deficiencies in the prior art, there is provided a kind of simple and practical, energy
The heat-pump-type tail recuperation of heat of dust penetrates adverse current fluidized dryer on automatic cleaning draught fan impeller.
For overcome the deficiencies in the prior art, the present invention takes following technical scheme：
A kind of heat-pump-type tail recuperation of heat penetrates adverse current fluidized dryer, including drying tower and air-introduced machine, it is characterised in that：It is dry
Dry tower top is provided with material envelope feed screw, and bottom is provided with wind stopping device discharging machine；Drying tower top connects air-introduced machine, air-introduced machine warp
Emptied after the evaporator of cyclone dust collectors connection heat pump；The evaporator of heat pump connects main frame, main frame warp through refrigerant pipe
Refrigerant pipe connects condenser；The condensed device connection drying tower bottom in outlet side of air blower；The air-introduced machine includes draught fan impeller
And casing, draught fan impeller include impeller backboard, impeller panel and blade, blade arrangement into impeller Axial and radial, it is centrosymmetric in
Empty anti-water-drop-shaped；Hollow anti-water-drop-shaped blade connection impeller panel is simultaneously welded to form impeller bodies with impeller backboard；Impeller panel
Provided with air inlet, impeller backboard is fixed by rivet and connection shaft seat, axle bed are connected by axis hole and fan shaft；Machine
Shell is provided with air inlet and air outlet, and cabinet form contour line is involute, the round heart of involute and blower fan axis coinciding, involute
Since on the inside of shell air outlet, line radius is gradually increased with involute circle, is terminated to shell air outlet outside, casing air-out
Mouth width is equal to involute circumference；Shell air inlet is provided with cover plate, also has air inlet to be easy to connecting pipe, and axle center on cover plate
With impeller axis coinciding.
Hydraulically extensible device connection power transmission shaft is provided with the top of the drying tower, power transmission shaft runs through tower body and can be by hydraulically extensible device
Driving up and down, power transmission shaft vibrate provided with vibration source transmission；It is made up of in drying tower body provided with multiple sieve aperture cone lid, sieve aperture cone disk
Stratiform repetitive structure, and bore and have certain interval between disk, cone lid and be all fixed on by elastic connection in tower wall；Bore disk and cone covers
Material blanking tube and axle sleeve are connected respectively, there are multiple conical plugs on power transmission shaft, conical plug can close material blanking tube upwards, down against axle sleeve
Material blanking tube can be opened.
The hollow anti-water-drop-shaped blade is combined into by the welding of two panels Curved surface metal, and has symmetrical streamline profile.
The casing is fixed on support.Casing plays sealing process, and air inlet air inlet is rotated by impeller obtains kinetic energy,
And energy conversion is carried out in casing, a part of kinetic energy is converted to the static energy of gas, so makes output gas flow that there is speed to move
Pressure head also has hydrostatic head, and both sums are exactly blower press.
Shell air inlet can connect airduct according to need, and air intake velar plate is detachable, be bolted to connection casing, machine
The scroll casing shape of shell gradually opens profile and meets closed Fan casing, conveying gas while the needs for realizing energy efficient conversion, makes output gas
Stream can reach required flow and total head.
The shell air inlet cover plate is bolted to connection casing, and can dismantle.
When equipment works, material to be dried is entered in the cone disk on drying tower top by material envelope feed screw, now liquid
Pressure expansion bend drives power transmission shaft conical plug is compressed closing material blanking tube upwards.Behind Vibration on Start-up source, boring material in disk can be because of vibration
Concentrated to the material blanking tube of centre, now cone lid is unaffected.
When hydraulically extensible device drives power transmission shaft downward, conical plug can be downwardly against on axle sleeve and open material blanking tube, at this moment
Material can be fallen by material blanking tube to be covered in lower floor's cone.Restart vibration source, boring the material covered can be because vibrating to the scattered fortune in edge
Dynamic, the gap by boring lid and cone disk enters lower floor and bores disk, and it is unaffected now to bore disk.
Upper and lower flexible and vibration source the start and stop of hydraulically extensible device, material can be made on sieve aperture cone lid and sieve aperture cone disk
Concentrate, spread, fall repeatedly, make progressively moving downward for fluidization of material, realize that hot air type is worn with hot-air from bottom to top
Saturating countercurrent fluidized drying, makes that drying efficiency is high, energy consumption is extremely low, and dried material is defeated by bottom of towe wind stopping device discharging machine
Go out.
Air-introduced machine will introduce evaporator fin and complete tail recuperation of heat after damp and hot tail gas cyclone dust removal, by heat pump main frame work
Make, convey refrigerant by refrigerant pipe discharges heat in fin condenser, and the air that air blower blasts changes on fin condenser
After heat heating, into drying tower bottom, realize that hot air type penetrates countercurrent fluidized drying with the material that fluidization is progressively fallen.
The draught fan impeller of the present invention is in use, because blade design is into hollow anti-water-drop-shaped, and sharf radial center
Symmetrically, thus at a high speed rotate when, blade surface under the action of the centrifugal force have centrifugation self purification, make dust by centrifugation masterpiece
With and can not adhere to, do not interfere with dynamic, the static balancing of impeller thus, will not more accumulate dust；This blade construction
Technical scheme, it is particularly suitable for the big wide impeller air-introduced machine of delivery air amount and uses.
Compared with prior art, beneficial effects of the present invention also reside in：
It is ingenious, ideally real by setting sieve aperture cone lid, sieve aperture to bore disk, material blanking tube, stretching vibration power transmission shaft and conical plug
Show to the penetrating of material, adverse current, boiling and fluidized drying, surmounted the boiling counter-current drying pattern of classics completely, more saved
Energy, dry mass is higher, blower fan power consumption is lower；The recuperation of heat of heat-pump-type tail is adapted to the relatively low heat recovery of exhaust temperature, especially high
It is convenient to imitate.
Blade design is into hollow anti-water-drop-shaped, and sharf radial center is symmetrical, makes its blower fan backboard connected and face
The anti-relative torsion of plate, extruding rigidity are extremely strong, the fracture of fan blade connection backboard root caused by can preventing long-time use.
Blade design is into hollow anti-water-drop-shaped, and sharf radial center is symmetrical, even with relatively thin board making wind
Machine impeller can also obtain higher intensity, ensure stable, reliable use, can save material, be easy to make, be also beneficial to equipment
Light and handyization.
Hollow anti-water-drop-shaped blade has streamline profile, and steadily skimming over property is fabulous for blade air, so fan operation noise
It is especially small, improve working environment.
The present invention by Vanes on Induced Draft Fan ingehious design into hollow anti-water-drop-shaped, and the symmetrical shape of sharf radial center,
The real-time cleaning of dust on blade is realized, the service life of equipment is extended and can effectively prevent the safety that dust accumulation triggers
Accident, have a extensive future.
Brief description of the drawings
Fig. 1 is the planar structure schematic diagram of the present invention
Fig. 2 is the planar structure schematic diagram of draught fan impeller.
Fig. 3 is the cross-sectional view of draught fan impeller.
Fig. 4 is the planar structure schematic diagram of air-introduced machine.
Each label represents in figure：
A, air-introduced machine；1st, drying tower；2nd, power transmission shaft；3rd, hydraulically extensible device；4th, material envelope feed screw；5th, vibration source；6、
Material blanking tube；7th, conical plug；8th, sieve aperture cone disk；9th, axle sleeve；10th, sieve aperture cone lid；11st, wind stopping device discharging machine；21st, cyclone dust collectors；
22nd, evaporator；23rd, blast pipe；24th, refrigerant pipe；25th, heat pump main frame；26th, condenser；27th, air blower；31st, anti-water-drop-shaped leaf
Piece；32nd, impeller is cylindrical；33rd, impeller air inlet；34th, axle bed；35th, rivet；36th, axis hole；37th, impeller backboard；38th, impeller panel；
41st, impeller；42nd, shell air inlet；43rd, involute is justified；44th, support；45th, casing；46th, shell air inlet cover plate；47th, casing goes out
Air port；B, shell air outlet width.
Embodiment
In conjunction with accompanying drawing, the present invention is further elaborated with.
The recuperation of heat of heat-pump-type tail penetrates adverse current fluidized dryer, including the He of drying tower 1 as shown in Figure 1, Figure 2, Figure 3 and Figure 4
Air-introduced machine A, drying tower top are provided with material envelope feed screw 4, and bottom is provided with wind stopping device discharging machine 11；The connection of drying tower top is drawn
Emptied after the evaporator 22 that blower fan A, air-introduced machine A connect heat pump through cyclone dust collectors 21；The evaporator 22 of heat pump passes through
Refrigerant pipe 24 connects main frame 25, and main frame 25 connects condenser 26 through refrigerant pipe 24；The condensed device 26 in outlet side of air blower 27 connects
Connect drying tower bottom；The air-introduced machine A includes draught fan impeller 41 and casing 45, and draught fan impeller 41 includes impeller backboard 37, impeller
Panel 38 and blade 31, blade 31 are arranged to impeller Axial and radial, centrosymmetric hollow anti-water-drop-shaped；Hollow anti-water-drop-shaped blade
31 connection impeller panels 38 are simultaneously welded to form impeller bodies with impeller backboard 37；Impeller panel 38 is provided with air inlet 33, impeller is carried on the back
Plate 37 is fixed by rivet 35 and connection shaft seat 34, axle bed 34 are connected by axis hole 36 with fan shaft；Casing 45 is set
There are an air inlet 42 and air outlet 47, cabinet form contour line is involute, the round heart of involute and blower fan axis coinciding, involute
Since the inner side of shell air outlet 47, line radius is gradually increased with involute circle, is terminated to the outside of shell air outlet 47, casing
Air outlet width B is equal to involute and justifies 43 girths；Shell air inlet 42 is provided with cover plate 46, also has air inlet to be easy to connect on cover plate
Pipeline, and axle center and impeller axis coinciding.
The top of drying tower 1 is provided with hydraulically extensible device 3 and connects power transmission shaft 2, and power transmission shaft 2 is through tower body and can be stretched by hydraulic pressure
Contracting device drives about 3, and power transmission shaft 2 is provided with vibration source 5 and transmits vibration；Dry in tower body 1 and lid 10, sieve are bored by sieve aperture provided with multiple
The stratiform repetitive structure that hole cone disk 8 forms, and have certain interval between cone disk 8, cone lid 10 and tower is all fixed on by elastic connection
On wall；Cone disk 8 and cone lid 10 connect material blanking tube 6 and axle sleeve 9 respectively, there is multiple conical plugs 7,7 upward energy of conical plug on power transmission shaft 2
Material blanking tube 6 is closed, material blanking tube 6 can be opened down against axle sleeve 9.
The hollow anti-water-drop-shaped blade 31 is combined into by the welding of two panels Curved surface metal, and has symmetrical streamline profile.
The casing 45 is fixed on support 44.Casing 45 plays sealing process, and the air inlet of air inlet 42 is revolved by impeller 41
Turn to obtain kinetic energy, and energy conversion is carried out in casing 45, a part of kinetic energy is converted to the static energy of gas, so makes output gas
There is stream speed dynamic head to also have hydrostatic head, and both sums are exactly blower press.
Shell air inlet 42 can connect airduct according to need, and air intake velar plate 46 is detachable, is bolted to connection machine
Shell 45, the scroll casing shape of casing 45 gradually open profile and meet closed Fan casing, conveying gas while the needs for realizing energy efficient conversion,
Output gas flow is set to reach required flow and total head.
The shell air inlet cover plate 46 is bolted to connection casing 45, and can dismantle.
When equipment works, material to be dried is entered in the cone disk 8 on the top of drying tower 1 by material envelope feed screw 4, now
Hydraulically extensible device 3 drives power transmission shaft 2 conical plug 7 is compressed upwards and closes material blanking tube 6.Behind Vibration on Start-up source 5, material in disk 8 is bored
It can be concentrated because of the material blanking tube 6 vibrated to centre, it is unaffected now to bore lid 10.
When hydraulically extensible device 3 drives power transmission shaft 2 downward, conical plug 7 can be downwardly against on axle sleeve 9 and open material blanking tube 6,
At this moment material can be fallen by material blanking tube 6 on lower floor's cone lid 10.Restart vibration source 5, bore material on lid 10 can because vibration to
The scattered motion in edge, the gap by boring lid and cone disk enter lower floor and bore disk 8, and it is unaffected now to bore disk 8.
Upper and lower flexible and vibration source 5 the start and stop of hydraulically extensible device 3, can make material bore lid 10 and sieve aperture cone in sieve aperture
Concentrate, spread, fall repeatedly on disk 8, make progressively moving downward for fluidization of material, hot blast is realized with hot-air from bottom to top
Formula penetrates countercurrent fluidized drying, makes that drying efficiency is high, energy consumption is extremely low, and dried material passes through bottom of towe wind stopping device discharging machine
11 outputs.
Air-introduced machine A will introduce evaporator fin 22 and complete tail recuperation of heat after damp and hot tail gas cyclone dust removal, by heat pump main frame
25 work, refrigerant release heat in fin condenser 26 is conveyed by refrigerant pipe 24, the air that air blower 27 blasts is in fin
On condenser 26 after heat exchange heating, into the bottom of drying tower 1, realize that hot air type penetrates adverse current with the material that fluidization is progressively fallen
Fluidized drying.
The draught fan impeller of the present invention is in use, because blade design is into hollow anti-water-drop-shaped, and sharf radial center
Symmetrically, thus at a high speed rotate when, blade surface under the action of the centrifugal force have centrifugation self purification, make dust by centrifugation masterpiece
With and can not adhere to, do not interfere with dynamic, the static balancing of impeller thus, will not more accumulate dust；This blade construction
Technical scheme, it is particularly suitable for the big wide impeller air-introduced machine of delivery air amount and uses.
Above-mentioned simply presently preferred embodiments of the present invention, not makees any formal limitation to the present invention.It is any to be familiar with sheet
The technical staff in field, in the case where not departing from technical solution of the present invention scope, all using the technology contents of the disclosure above
Many possible changes and modifications are made to technical solution of the present invention, or are revised as the equivalent embodiment of equivalent variations.Therefore, it is all
It is the content without departing from technical solution of the present invention, any is simply repaiied to made for any of the above embodiments according to the technology of the present invention essence
Change, equivalent variations and modification, all should fall in the range of technical solution of the present invention protection.
Claims (4)
1. a kind of heat-pump-type tail recuperation of heat penetrates adverse current fluidized dryer, including drying tower and air-introduced machine, it is characterised in that：Dry
Tower top is provided with material envelope feed screw, and bottom is provided with wind stopping device discharging machine；Drying tower top connects air-introduced machine, and air-introduced machine is through rotation
Emptied after the evaporator of wind deduster connection heat pump；The evaporator of heat pump connects main frame through refrigerant pipe, and main frame is through cold
Matchmaker's pipe connects condenser；The condensed device connection drying tower bottom in outlet side of air blower；The air-introduced machine include draught fan impeller and
Casing, draught fan impeller include impeller backboard, impeller panel and blade, and blade arrangement is into impeller Axial and radial, centrosymmetric hollow
Anti- water-drop-shaped；Hollow anti-water-drop-shaped blade connection impeller panel is simultaneously welded to form impeller bodies with impeller backboard；Impeller panel is set
There is air inlet, impeller backboard is fixed by rivet and connection shaft seat, axle bed are connected by axis hole and fan shaft；Casing
Provided with air inlet and air outlet, cabinet form contour line is involute, the round heart of involute and blower fan axis coinciding, involute from
Start on the inside of shell air outlet, line radius is gradually increased with involute circle, is terminated to shell air outlet outside, shell air outlet
Width is equal to involute circumference；Shell air inlet is provided with cover plate, also has air inlet to be easy to connecting pipe on cover plate, and axle center and
Impeller axis coinciding；Hydraulically extensible device connection power transmission shaft is provided with the top of the drying tower, power transmission shaft runs through tower body and can be by hydraulic pressure
Expansion bend drives up and down, and power transmission shaft vibrates provided with vibration source transmission；It is provided with drying tower body multiple by sieve aperture cone lid, sieve aperture cone
The stratiform repetitive structure of disk composition, and have certain interval between cone disk, cone lid and be all fixed on by elastic connection in tower wall；Bore disk
Material blanking tube and axle sleeve are connected respectively with cone lid, there are multiple conical plugs on power transmission shaft, conical plug can close material blanking tube upwards, downwardly against
Mandrel set can open material blanking tube.
2. the recuperation of heat of heat-pump-type tail penetrates adverse current fluidized dryer according to claim 1, it is characterised in that：It is described hollow anti-
Water-drop-shaped blade is combined into by the welding of two panels Curved surface metal, and has symmetrical streamline profile.
3. heat-pump-type tail recuperation of heat according to claim 1 or claim 2 penetrates adverse current fluidized dryer, it is characterised in that：The machine
Shell is fixed on support.
4. heat-pump-type tail recuperation of heat according to claim 1 or claim 2 penetrates adverse current fluidized dryer, it is characterised in that：The machine
Shell air intake velar plate is bolted to connection casing, and can dismantle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510496272.XA CN105020986B (en) | 2015-08-14 | 2015-08-14 | Heat-pump-type tail recuperation of heat penetrates adverse current fluidized dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510496272.XA CN105020986B (en) | 2015-08-14 | 2015-08-14 | Heat-pump-type tail recuperation of heat penetrates adverse current fluidized dryer |
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| Publication Number | Publication Date |
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| CN105020986A CN105020986A (en) | 2015-11-04 |
| CN105020986B true CN105020986B (en) | 2018-03-13 |
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| US3976018A (en) * | 1975-02-14 | 1976-08-24 | William Paul Boulet | Dryer system |
| CN101886874A (en) * | 2009-05-12 | 2010-11-17 | 甘肃锦世化工有限责任公司 | Automatic constant temperature drying and automatic regulation material flow control device of light energy vertical dryer |
| CN201653102U (en) * | 2010-05-12 | 2010-11-24 | 郑州市飞航真空干燥技术有限公司 | Heat pump tower type continuous drying device |
| CN201810564U (en) * | 2010-09-07 | 2011-04-27 | 刘忠宜 | Centrifugal fan capable of axial air inlet and outlet |
| CN201844671U (en) * | 2010-10-11 | 2011-05-25 | 盐城市科宝达科技实业有限公司 | Dedicated vertical type dryer for industrial residues |
| CN202008279U (en) * | 2010-11-05 | 2011-10-12 | 王彬 | Material drying tower, material drying system and coking coal humidifying system |
| CN203067343U (en) * | 2012-12-16 | 2013-07-17 | 登封市嵩基水泥有限公司 | Dust-proof centrifugal fan vane wheel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61142399A (en) * | 1984-12-14 | 1986-06-30 | Hitachi Ltd | Method of preventing adhesion of dust to static blade |
| US9689264B2 (en) * | 2013-03-15 | 2017-06-27 | Regal Beloit America, Inc. | Centrifugal fan impeller with variable shape fan blades and method of assembly |
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- 2015-08-14 CN CN201510496272.XA patent/CN105020986B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976018A (en) * | 1975-02-14 | 1976-08-24 | William Paul Boulet | Dryer system |
| CN101886874A (en) * | 2009-05-12 | 2010-11-17 | 甘肃锦世化工有限责任公司 | Automatic constant temperature drying and automatic regulation material flow control device of light energy vertical dryer |
| CN201653102U (en) * | 2010-05-12 | 2010-11-24 | 郑州市飞航真空干燥技术有限公司 | Heat pump tower type continuous drying device |
| CN201810564U (en) * | 2010-09-07 | 2011-04-27 | 刘忠宜 | Centrifugal fan capable of axial air inlet and outlet |
| CN201844671U (en) * | 2010-10-11 | 2011-05-25 | 盐城市科宝达科技实业有限公司 | Dedicated vertical type dryer for industrial residues |
| CN202008279U (en) * | 2010-11-05 | 2011-10-12 | 王彬 | Material drying tower, material drying system and coking coal humidifying system |
| CN203067343U (en) * | 2012-12-16 | 2013-07-17 | 登封市嵩基水泥有限公司 | Dust-proof centrifugal fan vane wheel |
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| CN105020986A (en) | 2015-11-04 |
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