CN207049084U - A kind of noise-reduction fan - Google Patents
A kind of noise-reduction fan Download PDFInfo
- Publication number
- CN207049084U CN207049084U CN201721018508.XU CN201721018508U CN207049084U CN 207049084 U CN207049084 U CN 207049084U CN 201721018508 U CN201721018508 U CN 201721018508U CN 207049084 U CN207049084 U CN 207049084U
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- China
- Prior art keywords
- brush
- flabellum
- fan
- 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.)
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- 241000883990 Flabellum Species 0.000 claims abstract description 79
- 238000009434 installation Methods 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims description 8
- 241001465754 Metazoa Species 0.000 claims description 5
- 230000003068 static effect Effects 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000033001 locomotion Effects 0.000 description 19
- 238000001816 cooling Methods 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000003379 elimination reaction Methods 0.000 description 8
- 230000008030 elimination Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 238000013475 authorization Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 206010068150 Acoustic shock Diseases 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000005303 weighing Methods 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
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
- F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/55—Seals
- F05D2240/56—Brush seals
Abstract
A kind of noise-reduction fan, including rotating shaft installation portion, flabellum, brush, the flabellum include flabellum junction surface, flabellum body and flabellum leaf tip successively along fan radial direction, and the brush is arranged at flabellum leaf tip.Had the following advantages that compared with prior art according to a kind of noise-reduction fan provided by the utility model：It is simple in construction, production cost is low, static pressure is high, air quantity is big, noise is low, the volumetric efficiency of fan, mechanical efficiency and radiating efficiency are high.
Description
Technical field
It the utility model is related to a kind of fan, more particularly to a kind of noise-reduction fan.
Background technology
Active water-cooling type radiator is because its space occupancy rate is low, good heat dissipation effect, and automobile radiators field is generally adopted at present
Engine is radiated with active water-cooling type radiator.However, due to active water-cooling type radiator fan and wind shelling cover it
Between need to set movement clearance in order to avoid collide between each other.And according to《Agricultural research》What 06 phase in 2006 published
Content in " researchs of Volume Efficiency of Engine Cooling Fan computational methods ", under fan operating state, due to fan hub and
Fan circumference gas flow rate is different, inevitable that air return phenomenon is produced at movement clearance and easily forms vortex, so as to reduce
The radiating efficiency of fan, and due to fan blade and windage, produced in the presence of return air and vortex with air
Raw resonance, increases noise.As the important composite target for weighing automobile making level, noise, vibration and acoustic shock roughness
(NVH) index is equally closely coupled with vehicle failure problem, and how to reduce caused noise problem during fan running,
Becoming reduces one of NVH indexs, the important channel for improving users'comfort.
At present, fan has typically just done the improvement in structure to fan blade used by automobile radiators field, does not have
There are air return, vortex and the resonance problem for fundamentally overcoming the setting because of movement clearance to be triggered, such as：
On January 27th, 2016 Granted publication it is entitled：Car radiation noise-reduction fan assembly, Authorization Notice No. are：
CN204998333U utility model patent, disclose a kind of car radiation noise-reduction fan assembly, including fan-mounting support, wind
Motor assembly and fan blade assembly are fanned, wherein fan blade assembly is bonded and is inlaid at the top of fan electromotor, and fan electromotor is total
It is connected into by fastener on fan-mounting support, at the edge of each fan blade all provided with saw-tooth-type structures, and often
The rear tangent line of individual sawtooth is on same circumference.The radiator fan blade construction that the utility model patent provides, changes it
With the contact surface of air, reduce the resonance effects with air, reduce noise.However, this kind of fan balde structure is still not
It can overcome due to movement clearance be present and caused air return phenomenon between fan blade and wind shelling cover, fan cooling efficiency
It is low.Moreover, according to Bernoulli effect, this kind of fan balde structure can not overcome the whirlpool caused by draught head above and below fan blade
Flow phenomenon, static pressure is low, and air quantity is small, and fan cooling efficiency is low.
On April 2nd, 2003 Granted publication it is entitled：Flanging fan blade type is pressurized noise-reducing fan device, and Authorization Notice No. is：
CN2542861Y utility model patent, disclose a kind of flanging fan blade type supercharging noise-reducing fan device, including axle housing 1, connection
In the flabellum 2 of axle housing periphery；The flabellum includes windward side 21 and lee face 22 again, also has one to be folded to fan at the flabellum ora terminalis
The flanging of leaf lee face 22.The utility model can eliminate the vortex that axial flow fan blade is led in space is limited, and reduction is made an uproar
Sound, increase blast.Moved however, this kind of fan balde structure still can not overcome between fan blade and wind shelling cover due to existing
Gap and caused air return phenomenon, fan cooling efficiency are low.
It is entitled disclosed in 20 days March in 2013：A kind of computer radiating noise-reduction fan, application publication number are：
CN102979762A application for a patent for invention, a kind of computer radiating noise-reduction fan is disclosed, there is fan body 1, the wind
Rotating shaft 3 is fixedly connected with fan body 1, multiple flabellums 2, the edge tool of the flabellum 2 are connected with the rotating shaft 3
There is depressed part 21, there is through hole on the depressed part 21.Fan balde structure provided by the utility model is more due to being provided with
Individual through hole, radiating effect can be increased, but static pressure is low, and air quantity is small.
On May 26th, 2004 Granted publication it is entitled：Engine rear mounted bus cooling system with noise elimination structure, Authorization Notice No.
For：CN2617612Y utility model patent, a kind of engine rear mounted bus cooling system with noise elimination structure is disclosed, including it is front and rear
Connected charge air cooler and radiator, the air channel for being connected to charge air cooler front end, the water tank door installed in air inlet of air duct, be connected to it is scattered
The wind shelling cover and the fan in wind shelling cover of hot device rear end, in addition to the noise-elimination window on the inside of water tank door is arranged on, it is described
Air channel is noise elimination air channel, and described wind shelling cover is noise elimination wind shelling cover；Described noise-elimination window is shutter, the two sides of its blade
Respectively it is stained with one layer of deadener；Described noise elimination air channel is enclosed by roof, side wall and bottom plate to be formed, roof, side wall and bottom plate
Respectively it is combined by multilayer material, the multilayer material includes absorbent treatment, damping layer and the acoustic enclosure of order stacking from inside to outside
Layer；Described noise elimination wind shelling cover is combined by multilayer material, and the multilayer material includes the absorbent treatment of order stacking from inside to outside
With acoustic enclosure layer.Technical scheme provided by the utility model using eliminating the noise and sound insulating material barrier noise, does not provide mainly
The technical solution of fan caused noise in itself is reduced, the use of deadener also undoubtedly adds production cost.
On May 26th, 2004 Granted publication it is entitled：Rotary-brushing type radiating dust arrester is depressurized, Authorization Notice No. is：
CN203196924U utility model patent, a kind of decompression rotary-brushing type radiating dust arrester is disclosed, is included in affixed on water tank 6
Collecting cover 7, engine blower 8 is engaged with collecting cover 7, the inlet side of water tank 6 it is affixed there is air intake surface and air outlet
Flat case 1 is sealed, power transmission shaft is installed with by bearing block on the air intake surface of sealing flat case 1, in sealing flat case 1
Counter-rotating fan 4 is fixedly mounted with power transmission shaft 5, affixed decompression impeller on the power transmission shaft 5 on the right side of the bearing block in sealing flat case 1
3, affixed the rotating brushes 2 on the power transmission shaft 5 outside sealing flat case 1, the bristle of rotating brushes 2 is equal with sealing flat case 1
The air intake surface of cloth through hole is engaged.Technical scheme provided by the utility model, hairbrush mainly divulging information repeatedly by the absorption of rotation brush
Debris and grass cuttings on face, for reducing because air return phenomenon caused by fan rotation and vortex, reduction noise be not straight
Connect effect.
According to above-mentioned, in order to reduce because fan rotate caused by air return phenomenon and vortex, so as to reduce flabellum with
The resonance of air, reduces noise, and people are reached by the way of improvement this body structure of fan blade or using deadener mostly
To the purpose of noise reduction, but do not solve well because of the presence of movement clearance between fan and wind shelling cover and caused by air return
Flow problem.
Utility model content
The utility model is directed to above-mentioned the deficiencies in the prior art, there is provided one kind is simple in construction, production cost is low, static pressure is high,
The noise-reduction fan that air quantity is big, noise is low.
A kind of noise-reduction fan provided by the utility model, there is following technical scheme：
A kind of noise-reduction fan, including rotating shaft installation portion and flabellum, in addition to brush, the flabellum along fan radial direction according to
It is secondary to be arranged at flabellum leaf tip including flabellum junction surface, flabellum body and flabellum leaf tip, the brush.Set in flabellum leaf tip
Brush is equipped with, on the one hand can stop that air-flow flows to depression from high-pressure area, avoids flabellum leaf tip periphery from forming vortex
And then the formation of lift is influenceed, flabellum is kept high static pressure, reduce the resonance of flabellum so as to reduce noise；On the other hand, fanning
Leaf leaf tip sets brush to stop that air flows back at movement clearance, avoids the formation of sinuous flow, reduces the resonance of flabellum,
Reduce noise；Further, setting brush to play a part of flexible buffer in flabellum leaf tip, flabellum is avoided to exist with wind shelling cover
Occur to occur colliding with and cause serious mechanical damage during relative motion.
A kind of noise-reduction fan provided by the utility model, following attached technical scheme can also be included：
Wherein, the brush is along fan radial direction extension 5mm-50mm.Fan outer rim and shield in automobile radiators field
Movement clearance radial distance between fan housing inner edge is at least 10mm, to ensure flabellum and wind shelling cover when relative motion occurs not
Can mutually it collide with.However, the movement clearance reduced to improve the volumetric efficiency of fan to try one's best between fan and wind shelling cover.In order to
Stop the formation of flabellum leaf tip periphery vortex, reduce air return phenomenon, by repetition test, it is preferable that the brush edge
Fan radial direction extension 5mm-50mm.
Wherein, the brush thickness is 0.1mm-4mm.To stop air return and avoiding the formation of vortex, brush needs
With certain thickness to ensure brush with stop air return and eliminate the intensity being vortexed, reach reduction flabellum and be total to air
Shake and produce the purpose of noise.By special process method, the brush can be implanted, be embedded in or be pressed into the flabellum blade tip
Portion, the flabellum leaf tip is riveted on after can also being molded.
Wherein, the brush is at least one of banding, wavy, zigzag, stepped and hypotenuse shape.The brush
Shape can refer to along the opposite end of brush described in fan radial direction and flabellum abutting end in banding, wavy, zigzag, rank
At least one of scalariform and hypotenuse shape；It can also refer to along brush described in fan axial direction and the opposite end of flabellum abutting end and be in
At least one of banding, wavy, zigzag, stepped and hypotenuse shape.The brush can be arranged on flabellum leaf tip
On whole positions；It can also be arranged on the portion of flabellum leaf tip.Preferably, the brush is along fan radial direction institute
It is in banding to state brush and the opposite end of flabellum abutting end, and the brush is arranged on whole positions of flabellum leaf tip.
Wherein, the brush is formed by filament or fine, soft fur set.The brush can be integral；Can also be by filament
Or fine, soft fur set is formed, it is preferable that the brush is formed by filament set, and the string diameter of the filament is 0.05mm-2mm.
Wherein, the brush is at least one of plastic bruss band, rubber brush band, animal hair brush belt.When the brush is
One it is overall when, the brush can be plastic bruss band, at least one of rubber brush band；When the brush is by filament or fine, soft fur
When set forms, the brush can be at least one of plastic bruss band, rubber brush band, animal hair brush belt.
Brief description of the drawings
Fig. 1 is conventional each modular construction schematic diagram of active water-cooling type radiator and air return, vortex schematic diagram.
Fig. 2 is fan structure diagram provided by the utility model.
Fig. 3 is brush structural representation provided by the utility model.
Embodiment
The technical scheme provided with reference to embodiment the utility model is described further.
Referring to shown in Fig. 2 and Fig. 3, a kind of noise-reduction fan, including rotating shaft installation portion 1, flabellum 2, brush 3, flabellum 2 is along fan
Radial direction includes flabellum junction surface 21, flabellum body 22 and flabellum leaf tip 23 successively, and the brush 3 is arranged at flabellum blade tip
Portion 23.Because the fan of automobile active water-cooling type radiator belongs to moving component, it is typically mounted on engine crankshaft 4；And protect
Fan housing 6 belongs to static component, is typically mounted on radiator body 5, there must be movement clearance 7 between the two to avoid occurring
Collide with and influence fan normal operation, it is common that between the automobile radiators field fan outer rim and the inner edge of wind shelling cover 6
Stand-off distance, to ensure that fan can run well, avoids colliding with wind shelling cover 6, ensures the radiating effect of fan from least 10mm
Fruit.When the fan is operating, according to Bernoulli effect, due to asymmetry above and below the cross sectional shape of flabellum 2, the top of flabellum 2 is caused
It is different with the pressure of lower section, and then lift is formed, high static pressure is formed at flabellum 2, makes air flow radiator body 5.It is theoretical
For upper, if the endless of flabellum 2, the pressure difference above and below flabellum 2 can be because nowhere flow to low gas by high-pressure area
Nip and high static pressure is kept at flabellum 2 always, then the air quantity of fan is big, mechanical efficiency, volumetric efficiency and radiating efficiency are high.
However, the impossible endless of flabellum 2, and because the problem of setting of movement clearance 7 is necessarily brought is：Because of the top of flabellum 2 and
The pressure difference of lower section so that air flows to depression in the periphery of flabellum leaf tip 23 by high-pressure area, produces vortex, influences to rise
The formation of power so that static pressure declines at flabellum 2, and the air quantity of fan reduces, and flabellum 2 resonates therewith, produces noise；And due to wind
Fan hub is different with fan circumference gas flow rate, is easily formed about a low regime in fan hub；In fan circumference region
An annular high velocity is formed, the presence of movement clearance 7 in addition, to flow to the air of radiator body 5 originally, some will
Flowed back at movement clearance 7, reduce the mechanical efficiency of fan, easily form sinuous flow, cause flabellum 2 to resonate, produce bigger make an uproar
Sound.Preferably, technical scheme provided by the utility model is provided with brush 3 in flabellum leaf tip 23, on the one hand can stop
Air-flow flows to depression from high-pressure area, avoids the periphery of flabellum leaf tip 23 from forming the formation for being vortexed and then influenceing lift, makes
Flabellum 2 keeps high static pressure, reduces the resonance of flabellum 2 so as to reducing noise；On the other hand, brush 3 is set in flabellum leaf tip 23
It can also stop that air flows back at movement clearance 7, avoid the formation of sinuous flow, reduce the resonance of flabellum 2, reduce noise；Again
Have, set brush 3 to play a part of flexible buffer in flabellum leaf tip 23, avoid flabellum 2 that phase is occurring with wind shelling cover 6
Cause serious mechanical damage to occurring colliding with during motion.
Referring to shown in Fig. 1 and Fig. 2, the brush 3 is along fan radial direction extension 5mm-50mm.In automobile radiators field
The radial distance of movement clearance 7 between fan outer rim and the inner edge of wind shelling cover 6 is at least 10mm, to ensure flabellum 2 and wind shelling cover 6
Will not mutually it be collided with when relative motion occurs.However, it is contemplated that the volumetric efficiency η of fanv=V2/V1, wherein V1To flow through wind
Fan the air capacity (m of active wheel3/s)；V2To remove effective air capacity (m after volumetric loss3/s).When designing cooling system,
The movement clearance 7 reduced to improve the volumetric efficiency of fan to try one's best between fan and wind shelling cover 6.Preferably, fanned to stop
The formation of the periphery of leaf leaf tip 23 vortex, air return phenomenon is reduced, by repetition test, the brush 3 is along fan radial direction side
To extension 5mm-50mm.
It is shown in Figure 2, to stop air return and avoiding the formation of vortex, brush 3 need to have certain thickness with
Ensure that brush 3 has the intensity for stopping air return and eliminating vortex, reach and reduce the mesh that flabellum 2 produces noise with air resonance
's.Preferably, the thickness of brush 3 is 0.1mm-4mm.By special process method, the brush 3 can be implanted, be embedded
Or the press-in flabellum leaf tip 23, the flabellum leaf tip 23 is riveted on after can also being molded.
Referring to shown in Fig. 2 and Fig. 3, the brush 3 in banding, wavy, zigzag, stepped and hypotenuse shape at least
It is a kind of.The shape of the brush 3 can refer to along the opposite end 31 of brush described in fan radial direction and flabellum abutting end in banding,
At least one of wavy, zigzag, stepped and hypotenuse shape；It can also refer to along brush and flabellum described in fan axial direction
The opposite end 31 of abutting end is at least one of banding, wavy, zigzag, stepped and hypotenuse shape.The brush 3 can be with
It is arranged on whole positions of flabellum leaf tip 23；It can also be arranged on the portion of flabellum leaf tip 23.Preferably,
Opposite end 31 of the brush 3 along brush described in fan radial direction and flabellum abutting end is in banding, and the brush 3 is arranged on fan
On whole positions of leaf leaf tip 23.
Referring to shown in Fig. 2 and Fig. 3, the brush 3 is formed by filament or fine, soft fur set.The brush 3 can be one whole
Body；It can also be formed by filament or fine, soft fur set, it is preferable that the brush 3 is formed by filament set, the string diameter of the filament
For 0.05mm-2mm.
Referring to shown in Fig. 2 and Fig. 3, the brush 3 can be in plastic bruss band, rubber brush band, animal hair brush belt at least
It is a kind of.When the brush 3 is integral, the brush 3 is at least one of plastic bruss band, rubber brush band；When the brush
When band 3 is formed by filament or fine, soft fur set, the brush 3 is at least one in plastic bruss band, rubber brush band, animal hair brush belt
Kind.Preferably, the brush 3 is rubber brush band.
Confirmed through overtesting, the brush is arranged at flabellum leaf tip so that the performance of radiator fans arrives
Very big raising, specifically see following table：
By Data acquisition and issuance, it can be deduced that static pressure-stream that following conventional Ian compares with the fan with brush
Curve and efficiency-flow curve are measured, following curves also confirm the technical scheme that the utility model is provided and remaining high at flabellum
Beneficial effect in terms of static pressure and raising fan cooling efficiency, preferably solves the car radiation of generally existing in the prior art
Mechanical efficiency, the volumetric efficiency of device fan are low and the problem of noise is big.Especially under the operating mode of big flow, the effect of brush
Fruit is more obvious.
Although finally it is pointed out that the utility model has elaborated above-mentioned specific embodiment, this area is directed to
Those of ordinary skill for, it can be understood as do not depart from principle of the present utility model and spirit in the case of, can be to described
Embodiment is changed, and the scope of the utility model is limited by appended claim extremely equivalent.
Claims (7)
1. a kind of noise-reduction fan, including rotating shaft installation portion and flabellum, the flabellum connect including flabellum successively along fan radial direction
Conjunction portion, flabellum body and flabellum leaf tip, it is characterised in that：Also include brush, the brush is arranged at flabellum leaf tip.
2. noise-reduction fan according to claim 1, it is characterised in that：The brush is along fan radial direction extension 5mm-
50mm。
3. noise-reduction fan according to claim 1, it is characterised in that：The brush thickness is 0.1mm-4mm.
4. noise-reduction fan according to claim 1, it is characterised in that：The brush is in banding, wavy, zigzag, rank
At least one of scalariform and hypotenuse shape.
5. noise-reduction fan according to claim 1, it is characterised in that：The brush is in plastic bruss band, rubber brush band
It is at least one.
6. noise-reduction fan according to claim 1, it is characterised in that：The brush is formed by filament or fine, soft fur set.
7. noise-reduction fan according to claim 6, it is characterised in that：The brush is plastic bruss band, rubber brush band, animal
At least one of hair brush belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721018508.XU CN207049084U (en) | 2017-08-15 | 2017-08-15 | A kind of noise-reduction fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721018508.XU CN207049084U (en) | 2017-08-15 | 2017-08-15 | A kind of noise-reduction fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207049084U true CN207049084U (en) | 2018-02-27 |
Family
ID=61502663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721018508.XU Active CN207049084U (en) | 2017-08-15 | 2017-08-15 | A kind of noise-reduction fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207049084U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637077A (en) * | 2020-06-10 | 2020-09-08 | 安徽庐风风机有限公司 | Numerical control fan convenient for cleaning internal dust |
| CN112814776A (en) * | 2021-01-04 | 2021-05-18 | 东风柳州汽车有限公司 | Heat radiator for automobile engine |
-
2017
- 2017-08-15 CN CN201721018508.XU patent/CN207049084U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637077A (en) * | 2020-06-10 | 2020-09-08 | 安徽庐风风机有限公司 | Numerical control fan convenient for cleaning internal dust |
| CN111637077B (en) * | 2020-06-10 | 2021-09-24 | 安徽庐风风机有限公司 | Numerical control fan convenient for cleaning internal dust |
| CN112814776A (en) * | 2021-01-04 | 2021-05-18 | 东风柳州汽车有限公司 | Heat radiator for automobile engine |
| CN112814776B (en) * | 2021-01-04 | 2022-03-11 | 东风柳州汽车有限公司 | Heat radiator for automobile engine |
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