CN107339259A - A kind of multi-wing centrifugal fan - Google Patents
A kind of multi-wing centrifugal fan Download PDFInfo
- Publication number
- CN107339259A CN107339259A CN201710230900.9A CN201710230900A CN107339259A CN 107339259 A CN107339259 A CN 107339259A CN 201710230900 A CN201710230900 A CN 201710230900A CN 107339259 A CN107339259 A CN 107339259A
- Authority
- CN
- China
- Prior art keywords
- guide vane
- support
- impeller
- spiral case
- outer ring
- 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.)
- Granted
Links
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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
- F04D29/444—Bladed diffusers
-
- 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
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
Abstract
The present invention relates to a kind of multi-wing centrifugal fan, including spiral case and the impeller and motor that are arranged in the spiral case, the spiral case are provided with air inlet and air outlet；It is characterized in that the guide vane that at least the relatively described spiral case of two panels is static is also interval with the inner side of the impeller in the spiral case；It is preferred that each guide vane is arranged relative to the center convolution of the air inlet, and the rotation direction of each guide vane is identical with the rotation direction of the impeller.Compared with prior art, the present invention can effective energy loss, reduce noise, while improve flow in the circumferentially distributed uniformity of impeller, so as to reach the air quantity, blast, the total pressure efficiency that improve blower fan, reduce the effect of the noise of blower fan.
Description
Technical field
The present invention relates to centrifugal blower, refers specifically to a kind of multi-wing centrifugal fan.
Background technology
The blower fan that range hood uses is multiple wing type centrifugal blower fan mostly, the air velocity distribution at the impeller inlet of centrifugal blower
The disorderly gas field such as turbulent flow, eddy flow can be produced, the air quantity, blast, total pressure efficiency of blower fan can be made reduce.
CN201020287875.1 discloses one kind《Range hood air unit with rectified action》, it is in blower fan snail
The air inlet of shell fixes covering and is provided with screens.So, when air-flow passes through air inlet, by the rectified action of screens,
Flue gas is avoided to form turbulent flow when entering air inlet；But because there is a spacing at this patent screens position at vane inlet
From this improved effect or unobvious.
For another example CN201110432232.0 discloses one kind《Multiple wing type centrifugal blower fan with Multifunctional flow-guiding device》, its
Guide vane and air deflector are installed in impeller inner chamber, the performance such as blast, air quantity to range hood makes moderate progress, but because
Guide vane, the air deflector of the patent only cover the little space of impeller inner chamber, that the soot gas of impeller inner chamber are inwhole
Effectively water conservancy diversion.
The content of the invention
The technical problems to be solved by the invention are to provide one kind and can significantly improve impeller for the present situation of prior art
Kou Chu flow fields and the multi-wing centrifugal fan of excellent noise reduction effect.
Technical scheme is used by the present invention solves above-mentioned technical problem：The multi-wing centrifugal fan, including spiral case and set
Impeller and motor in the spiral case are put, the spiral case is provided with air inlet and air outlet；It is characterized in that in the spiral case
The guide vane that at least the relatively described spiral case of two panels is static, and each water conservancy diversion leaf are also interval with the inner side of the impeller
Piece is arranged relative to the center convolution of the air inlet.
Preferably, the rotation direction of each guide vane is identical with the rotation direction of the impeller.
Preferably, the external diameter of each guide vane is adapted with the size of the air inlet.
It is preferred that the inlet angle α of each guide vane is 80~100 °, the angle of outlet β of each guide vane for 140~
175°。
In above-mentioned each scheme, the structure of guide vane can have a variety of, such as tabular, preferably, each water conservancy diversion leaf
Piece is helicoid or globoidal structure.
It is preferred that the root width of the guide vane of helicoid structure is 10~20mm, the maximum of the guide vane is wide
Spend for 30~60mm.
Guide vane can have a variety of positioning and mounting means, and preferably, each blade can be connected on support, institute
Support is stated to be connected on the front end face of the spiral case.
The support can include the first support outer ring being arranged concentrically and the first support inner ring, the second support outer ring and the
Two support inner rings, and the first support outer ring is parallel to the second support outer ring；
The edge of each guide vane is spacing respectively to support outer ring, the first support inner ring, the second support described first
On outer ring and the second support inner ring.The structure is convenient for assembly, and inlet flow field is not impacted.
Preferably, the gap between the first support outer ring and the second support outer ring and the impeller is 3~10mm.
The diameter of the first support outer ring can be 3~8 times of the described first support inner ring diameter.
The diameter of the second support outer ring can be 3~8 times of the described second support inner ring diameter.
Compared with prior art, the guide vane that multi-wing centrifugal fan provided by the present invention passes through specific structure is set
Put, air inlet region is divided into each relatively independent region, a pre-selection component is produced to the fluid of entrance, leaf can be improved
Entrance flow field is taken turns, the actual relative fluid flow angle of fluid is intended to the relative fluid flow angle of blade, reduces multi-wing centrifugal fan leaf
Energy loss and larger noise caused by taking turns the high attack angle of import, while improve flow in the circumferentially distributed uniformity of impeller,
So as to reach the air quantity, blast, the total pressure efficiency that improve blower fan, the effect of the noise of blower fan is reduced, makes the oil suction equipped with the blower fan
Every condensation performance of cigarette machine gets a promotion；The soot gas of spiral case inlet inflow can be separated, condensed simultaneously, improve blower fan
Oil smoke separating effect, the grease separation rate of oil smoke are significantly improved, energy-saving and environmental protection positive effect；Guide vane simultaneously
The upstream of impeller is arranged on, the impeller of rotation is isolated by guide vane and spiral case at a high speed, prevents personnel from being touched because of maloperation
Impeller, good safety protection function is played to personnel and impeller.
Present invention is particularly suitable for the use of various range hoods.
Brief description of the drawings
Fig. 1 is the schematic perspective view of the assembling structure of the embodiment of the present invention 1；
Fig. 2 is the schematic perspective view of the decomposition texture of the embodiment of the present invention 1；
Fig. 3 is the longitudinal sectional view of the embodiment of the present invention 1；
Fig. 4 is the assembling structure floor map of guide vane and support in the embodiment of the present invention 1；
Fig. 5 is the floor map of the assembling structure of the embodiment of the present invention 1；
Fig. 6 is the midplane guide vane of the embodiment of the present invention 1 and the floor map of support assembling structure；
Fig. 7 is dump angle and flow velocity relativity figure in the embodiment of the present invention.
Fig. 8 and Fig. 9 is the different angle of the guide vane of helicoid and centring ring assembling structure in the embodiment of the present invention 2
Schematic perspective view；
Figure 10 is the floor map of guide vane and centring ring assembling structure in the embodiment of the present invention 2.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in Figures 1 to 7, the multi-wing centrifugal fan includes：
Spiral case 1 and the impeller 2 and motor 4 being arranged in spiral case 1, spiral case 1 are provided with air inlet 11 and air outlet 12.Its
Middle motor 4 is located at the middle part of impeller 2, and the output shaft of motor 4 passes through the drive connection impeller 2 of central plate 13.
Guide vane 3, there are more pieces, be disposed on by support 5 in spiral case 1, each guide vane 3 is relative to air inlet 11
Center arrange that the rotation direction of each screw arrangement of guide vane 3 is identical with the rotation direction of impeller 2 in the shape of a spiral.Each guide vane 3 is relative
It is located at the upstream of impeller 2 in airflow direction, and the gap between the outer ledge of each guide vane and impeller 2 is 7mm.This reality
It is spiral globoidal structure to apply each guide vane 3 in example, and the inlet angle α of guide vane 3 is 90 °, and angle of outlet β is 150 °.
Guide vane 3 can also be planar structure, as shown in Figure 6.
Support 5, for support and spacing each guide vane 3, it is the installation pedestal of each guide vane, including is arranged concentrically
First support outer ring 51 and first support inner ring 52, second support outer ring 53 and second support inner ring 54, first support outer ring
51 parallel to the second support outer ring 53；First support outer ring 51 and second support outer ring 53 a diameter of 240mm, first support in
A diameter of 60mm of the support inner ring 53 of circle 52 and second.Second support outer ring 53 is fixed on centring ring 56, and centring ring 56 is fixed
On the periphery of the air inlet 11 of spiral case 1.
The both sides of the edge of each guide vane 3 and outer ledge are spacing in the first support support inner ring of inner ring 52, second respectively
54 and second support on outer ring 53, and the inside edge of guide vane 3 externally protrudes out in the first support inner ring 52 and the first support outer ring 51；
Second support outer ring 53 is connected on centring ring 56, and centring ring 56 is connected by screw on the periphery of air inlet 11.This implementation
Example is also associated with connecting rod 55 between corresponding inner ring and outer ring, and the wall of each guide vane 3 is born against to be connected corresponding
On extension bar 55, further to consolidate the positioning of each guide vane 3.
As shown in fig. 7, the conventional centrifugal blower without guide vane, the actual absolute velocity of impeller inlet is V, blade
It is β 1 with respect to fluid flow angle, actual relative fluid flow angle is β 1 ', one angle of attack i=β 1- β 1 ' of difference between them.
After the present invention adds guide vane, actual absolute velocity V will flow out along the angle of outlet of guide vane, its axial plane
Speed is constant, so its speed is changed into V '.Now the relative fluid flow angle of flow of fluid is changed into β 1 from β 1 ' so that the import of impeller
The angle of attack is intended to 0, so as to greatly reduce capacity loss caused by gas shock and noise.
CFD emulation and test are carried out to the present invention, the present invention is relative to the centrifugal blower of routine, fluid rushing on impeller
Reduction is hit, so that runner whirlpool can effectively reduce, the flow velocity between leaf road similarly reduces, and makes Ye Daonei flow losses
It can accordingly reduce, while make the circumferential flow distribution of impeller also more uniform.
Embodiment 2
As shown in Fig. 8 to Figure 10, the guide vane 3 in the present embodiment is propeller arrangement, the root width of its helicoid
For 15mm, the Breadth Maximum of its end is 45mm.
Remaining content is same as Example 1.
The guide vane rotation of multiple helicoid structures can make the rotational domain that spiral case air inlet negative pressure forms 360 °, shape
Into tornado effect；During fume exhaust, bulky grain is aggregated into after oil smoke little particle rotary collision can be made, then by centrifugal blower leaf
Centrifugal force is thrown on the internal ring wall of spiral case caused by wheel, effectively improves oil smoke separating effect.Meanwhile oil smoke is passing through stator
When, it is necessary to entered around swirl vane in impeller blade, in this process, oil smoke can be contacted and filtered with swirl vane
Fall a part of grease, further improve oil smoke separating effect.
Relative to the guide vane in embodiment 1, the guide vane of helicoid reduces more to the actual angle of attack of air-flow,
The actual relative fluid flow angle of fluid is intended to the relative fluid flow angle of guide vane, further reduce the impact to impeller, improve
Flow circumference distributing homogeneity so that the performance such as the air quantity of blower fan, efficiency is improved.
Claims (10)
1. a kind of multi-wing centrifugal fan, including spiral case (1) and the impeller (2) and motor (4) that are arranged in the spiral case (1), institute
State spiral case (1) and be provided with air inlet (11) and air outlet (12)；It is characterized in that in the impeller (2) in the spiral case (1)
Inner side is also interval with the static guide vane (3) of the relatively described spiral case (1) of at least two panels, and each guide vane (3)
Arranged relative to the center convolution of the air inlet (11).
2. multi-wing centrifugal fan according to claim 1, it is characterised in that the rotation direction of each guide vane (3) with it is described
The rotation direction of impeller (2) is identical.
3. multi-wing centrifugal fan according to claim 2, it is characterised in that the external diameter of each guide vane (3) with it is described
The size of air inlet (11) is adapted.
4. multi-wing centrifugal fan according to claim 3, it is characterised in that the inlet angle α of each guide vane (3) is
80~100 °, the angle of outlet β of each guide vane (3) is 140~175 °.
5. multi-wing centrifugal fan according to claim 4, it is characterised in that each guide vane (3) is helicoid or arc
Face structure.
6. multi-wing centrifugal fan according to claim 5, it is characterised in that the guide vane (3) of helicoid structure
Root width is 10~20mm, and the Breadth Maximum of the guide vane (3) is 30~60mm.
7. according to multi-wing centrifugal fan described in claim 1 to 6 any claim, it is characterised in that each blade (3) is even
It is connected on support (5), the support is connected on the front end face of the spiral case (1).
8. the multi-wing centrifugal fan according to claim 7, it is characterised in that the support (5) includes what is be arranged concentrically
First support outer ring (51) and the first support inner ring (52), the second support outer ring (53) and the second support inner ring (54), and the
One support outer ring (51) is parallel to the second support outer ring (53)；Second support outer ring (53) is connected on centring ring (56),
The centring ring (56) is connected on the periphery of the air inlet (11)；
The edge of each guide vane (3) is spacing respectively to support outer ring (51), the first support inner ring (52), the described first
In two supports outer ring (53) and the second support inner ring (54).
9. multi-wing centrifugal fan according to claim 8, it is characterised in that first support outer ring (51) and second
The gap supportted between outer ring (53) and the impeller (2) is 3~10mm.
10. multi-wing centrifugal fan according to claim 9, it is characterised in that described first supports a diameter of of outer ring (51)
3~8 times of described first support inner ring (52) diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710230900.9A CN107339259B (en) | 2017-04-11 | 2017-04-11 | Multi-wing centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710230900.9A CN107339259B (en) | 2017-04-11 | 2017-04-11 | Multi-wing centrifugal fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107339259A true CN107339259A (en) | 2017-11-10 |
| CN107339259B CN107339259B (en) | 2023-09-15 |
Family
ID=60222628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710230900.9A Active CN107339259B (en) | 2017-04-11 | 2017-04-11 | Multi-wing centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107339259B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108223457A (en) * | 2017-12-16 | 2018-06-29 | 朱浩奇 | A kind of cooling denoising device of household fan motor |
| CN108592104A (en) * | 2018-03-26 | 2018-09-28 | 西安交通大学 | A kind of range hood containing built-in oil cleaner screen |
| CN110594197A (en) * | 2019-09-17 | 2019-12-20 | 佛山市顺德区美的洗涤电器制造有限公司 | Centrifugal fan and range hood |
| CN112503708A (en) * | 2020-12-03 | 2021-03-16 | 张传保 | Foul gas purifying equipment |
| CN116221147A (en) * | 2023-05-08 | 2023-06-06 | 远东双诚风机(江苏)有限公司 | Centrifugal fan capable of preventing gas backflow |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0976592A1 (en) * | 1998-07-31 | 2000-02-02 | Delphi Technologies, Inc. | Blower motor assembly with air inlet and an insert member therefor |
| JP2000064995A (en) * | 1998-08-19 | 2000-03-03 | Honda Motor Co Ltd | Centrifugal turbo blower |
| CN102562672A (en) * | 2011-12-15 | 2012-07-11 | 广东恒业电器有限公司 | Multi-wing centrifugal fan with multifunctional airflow diversion device |
| CN103573651A (en) * | 2013-11-08 | 2014-02-12 | 成都安迪生测量有限公司 | LNG immersed pump |
| CN103615411A (en) * | 2013-12-05 | 2014-03-05 | 江苏飞跃机泵集团有限公司 | Flow guiding generator of medium concentration pulp pump |
| CN104179728A (en) * | 2014-08-22 | 2014-12-03 | 广东海信家电有限公司 | Multi-wing centrifugal fan |
| US20150044026A1 (en) * | 2009-10-09 | 2015-02-12 | Ebara International Coporation | Inducer for Centrifugal Pump |
| CN204213050U (en) * | 2014-09-04 | 2015-03-18 | 广州水泵厂有限公司 | A kind of spatial guide blade of multistage sectional centrifugal pump |
| CN104454664A (en) * | 2014-11-26 | 2015-03-25 | 宁波方太厨具有限公司 | Multi-wing centrifugal fan |
| CN204267336U (en) * | 2014-12-01 | 2015-04-15 | 广东泛仕达机电有限公司 | A kind of multiple wing type centrifugal blower fan |
| KR20150120168A (en) * | 2014-04-17 | 2015-10-27 | 한국에너지기술연구원 | Centrifugal type mixed flow blower |
| US20160209893A1 (en) * | 2015-01-21 | 2016-07-21 | Lenovo (Beijing) Co., Ltd. | Centrifugal Fan and an Electronic Device Having the Same |
| JP2016142200A (en) * | 2015-02-03 | 2016-08-08 | 三菱重工業株式会社 | Centrifugal compressor |
| CN106368985A (en) * | 2016-11-23 | 2017-02-01 | 广东威灵电机制造有限公司 | Multi-stage flow guide device |
| CN206682046U (en) * | 2017-04-11 | 2017-11-28 | 宁波方太厨具有限公司 | A kind of multi-wing centrifugal fan |
-
2017
- 2017-04-11 CN CN201710230900.9A patent/CN107339259B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0976592A1 (en) * | 1998-07-31 | 2000-02-02 | Delphi Technologies, Inc. | Blower motor assembly with air inlet and an insert member therefor |
| JP2000064995A (en) * | 1998-08-19 | 2000-03-03 | Honda Motor Co Ltd | Centrifugal turbo blower |
| US20150044026A1 (en) * | 2009-10-09 | 2015-02-12 | Ebara International Coporation | Inducer for Centrifugal Pump |
| CN102562672A (en) * | 2011-12-15 | 2012-07-11 | 广东恒业电器有限公司 | Multi-wing centrifugal fan with multifunctional airflow diversion device |
| CN103573651A (en) * | 2013-11-08 | 2014-02-12 | 成都安迪生测量有限公司 | LNG immersed pump |
| CN103615411A (en) * | 2013-12-05 | 2014-03-05 | 江苏飞跃机泵集团有限公司 | Flow guiding generator of medium concentration pulp pump |
| KR20150120168A (en) * | 2014-04-17 | 2015-10-27 | 한국에너지기술연구원 | Centrifugal type mixed flow blower |
| CN104179728A (en) * | 2014-08-22 | 2014-12-03 | 广东海信家电有限公司 | Multi-wing centrifugal fan |
| CN204213050U (en) * | 2014-09-04 | 2015-03-18 | 广州水泵厂有限公司 | A kind of spatial guide blade of multistage sectional centrifugal pump |
| CN104454664A (en) * | 2014-11-26 | 2015-03-25 | 宁波方太厨具有限公司 | Multi-wing centrifugal fan |
| CN204267336U (en) * | 2014-12-01 | 2015-04-15 | 广东泛仕达机电有限公司 | A kind of multiple wing type centrifugal blower fan |
| US20160209893A1 (en) * | 2015-01-21 | 2016-07-21 | Lenovo (Beijing) Co., Ltd. | Centrifugal Fan and an Electronic Device Having the Same |
| JP2016142200A (en) * | 2015-02-03 | 2016-08-08 | 三菱重工業株式会社 | Centrifugal compressor |
| CN106368985A (en) * | 2016-11-23 | 2017-02-01 | 广东威灵电机制造有限公司 | Multi-stage flow guide device |
| CN206682046U (en) * | 2017-04-11 | 2017-11-28 | 宁波方太厨具有限公司 | A kind of multi-wing centrifugal fan |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108223457A (en) * | 2017-12-16 | 2018-06-29 | 朱浩奇 | A kind of cooling denoising device of household fan motor |
| CN108592104A (en) * | 2018-03-26 | 2018-09-28 | 西安交通大学 | A kind of range hood containing built-in oil cleaner screen |
| CN110594197A (en) * | 2019-09-17 | 2019-12-20 | 佛山市顺德区美的洗涤电器制造有限公司 | Centrifugal fan and range hood |
| CN110594197B (en) * | 2019-09-17 | 2021-08-31 | 佛山市顺德区美的洗涤电器制造有限公司 | Centrifugal fan and range hood |
| CN112503708A (en) * | 2020-12-03 | 2021-03-16 | 张传保 | Foul gas purifying equipment |
| CN112503708B (en) * | 2020-12-03 | 2022-07-08 | 粤卫协(广东)环境科技有限公司 | Foul gas purifying equipment |
| CN116221147A (en) * | 2023-05-08 | 2023-06-06 | 远东双诚风机(江苏)有限公司 | Centrifugal fan capable of preventing gas backflow |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107339259B (en) | 2023-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107339259A (en) | A kind of multi-wing centrifugal fan | |
| CN102032211B (en) | Biconical impeller for range hood | |
| CN209569199U (en) | Impeller, blower and kitchen ventilator | |
| CN107606662A (en) | Novel fan waste gas recycles turbocharging lampblack absorber | |
| CN103321929A (en) | Relay flow fan and extractor hood with same | |
| CN107339241A (en) | Multi-wing centrifugal fan | |
| CN106524263B (en) | A kind of range hood | |
| CN206682046U (en) | A kind of multi-wing centrifugal fan | |
| CN206682006U (en) | multi-wing centrifugal fan | |
| CN206682045U (en) | A kind of strong suction multi-wing centrifugal fan | |
| CN105090122A (en) | Centrifugal fan and vaneless diffuser thereof | |
| CN105107299A (en) | Wall-hanging air purifier | |
| CN105317755A (en) | Efficient and multistage micropunch fan silencer | |
| CN109209932A (en) | A kind of smoke exhaust ventilator equipped with diagonal flow fan | |
| CN208886870U (en) | A kind of range hood | |
| CN206338839U (en) | A kind of range hood | |
| CN107339261A (en) | A kind of strong suction multi-wing centrifugal fan | |
| CN110552899A (en) | multi-wing centrifugal fan for ventilator with built-in guide vanes | |
| CN107339260A (en) | Boosting stream centrifugal blower | |
| CN109185941A (en) | Axial pump drainage and the separation integrated range hood of oil smoke | |
| CN108869392A (en) | Composite impeller, centrifugal blower and range hood | |
| CN206957994U (en) | Boosting stream centrifugal blower | |
| CN205019853U (en) | Wall -mounted type air purifier | |
| CN208886871U (en) | A kind of range hood with collector | |
| CN103629156B (en) | A kind of central air conditioner outdoor unit but axial-flow blower of low-noise high-efficiency |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |