CN107503958A - A kind of centrifugal blower fan system for range hood - Google Patents
A kind of centrifugal blower fan system for range hood Download PDFInfo
- Publication number
- CN107503958A CN107503958A CN201710863603.8A CN201710863603A CN107503958A CN 107503958 A CN107503958 A CN 107503958A CN 201710863603 A CN201710863603 A CN 201710863603A CN 107503958 A CN107503958 A CN 107503958A
- Authority
- CN
- China
- Prior art keywords
- spiral case
- air
- impeller
- blower fan
- range hood
- 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.)
- Pending
Links
- 238000010943 off-gassing Methods 0.000 claims abstract description 21
- 238000009792 diffusion process Methods 0.000 claims abstract description 19
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 claims abstract description 4
- 230000000739 chaotic effect Effects 0.000 description 5
- 239000004519 grease Substances 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006233 lamp black Substances 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 239000000779 smoke Substances 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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- 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
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
-
- 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
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of centrifugal blower fan system for range hood, including spiral case, impeller, direct current variable frequency motor and air-ducting ring, the outer margin contour line of spiral case is by AB, BC, CD, the helix that arc section connected tetra- sections of DE is formed, the outer margin contour line forms the spiral case inlet pressure of spiral case, the inner chamber radial width of spiral case is incremented by from inside to outside along spiral case inlet pressure, the inner chamber forms spiral helicine gas flow, the outgassing direction of gas channel is set towards along the opening direction of spiral case inlet pressure, the air outlet seat fixed with spiral case is provided with the outside of the gas outlet of gas flow, air-guiding aisle is provided with air outlet seat, the wind-guiding direction of air-guiding aisle and the outgassing direction of gas flow are set along same track and direction, air-guiding aisle is collectively forming the diffusion passage of one direction diffusion with gas flow.The design of the invention is scientific and reasonable, and air-out is smooth, and air quantity is big, and blast is big, and noise is low, can lift overall performance and user experience.
Description
Technical field
The present invention relates to kitchen appliance technical field, more particularly, to a kind of centrifugal blower fan system for range hood.
Background technology
As people's life life improves, the requirement to quality of the life also accordingly improves, and range hood is as kitchen appliance
Important component, people's daily life is influenceed very big, the combination property for lifting range hood is also each range hood
Producer all compels the thing highly necessary done, and now with range hood generally existing, air quantity is less than normal, and smoke evacuation in actual use has some setbacks
Freely, phenomena such as blast is inadequate, and noise is larger always, and very big puzzlement is caused to user；And centrifugal blower fan system is as suction
The core component of lampblack absorber directly decides the quality of range hood performance.
In existing range hood centrifugal fan system, the outgassing direction of spiral case straight up, i.e. the air-out side of air outlet seat
To vertical with spiral case face, and spiral case angle of flare does not play diffusion action, causes to arrange centrifugal blower fan system outlet air-out and has some setbacks
Freely, airflow direction is chaotic, forms vortex, and noise is larger.
For example, application publication number CN106322467A, data of publication of application 2017.01.11 Chinese patent discloses one kind
Range hood, range hood include blower fan assembly and motor assembly, and the blower fan assembly includes impeller and for containing the leaf
The spiral case of wheel, the motor include motor body and axostylus axostyle, and the motor assembly also includes motor cover, the motor cover at least portion
Cover the motor body with dividing so that the motor body is determined under the running status of the range hood with the spiral case
The space of justice is isolated.The outgassing direction of spiral case straight up, causes entirely to centrifuge wind in the range hood centrifugal fan system
Machine system outlet air-out has some setbacks, and airflow direction is chaotic, forms vortex, and noise is larger.
The content of the invention
The present invention is to solve the above-mentioned technical problem present in the range hood centrifugal fan system of prior art, carry
Supply that a kind of design science is reasonable, and air-out is smooth, air quantity is big, and blast is big, the low centrifugal blower system for range hood of noise
System.
To achieve these goals, the present invention uses following technical scheme：
A kind of centrifugal blower fan system for range hood of the present invention, including spiral case, the impeller in spiral case, be located at
In spiral case and the direct current variable frequency motor being connected with impeller and the air-ducting ring located at spiral case both sides, the outer margin contour line of the spiral case
For the helix being made up of tetra- sections of connected arc sections of AB, BC, CD, DE, the outer margin contour line forms the spiral case inlet pressure of spiral case, institute
The inner chamber radial width for stating spiral case is incremented by from inside to outside along spiral case inlet pressure, and the inner chamber forms spiral helicine gas flow, the gas
The outgassing direction of circulation road is set towards along the opening direction of spiral case inlet pressure, is provided with the outside of the gas outlet of gas flow and is fixed with spiral case
Air outlet seat, is provided with air-guiding aisle, the wind-guiding direction of the air-guiding aisle and the outgassing direction of gas flow in the air outlet seat
Set along same track and direction, air-guiding aisle is collectively forming the diffusion passage of one direction diffusion with gas flow.In the present invention
Design is optimized to the structure of spiral case and air outlet seat, the outer margin contour line of spiral case is connected by tetra- sections of AB, BC, CD, DE
The helix that arc section is formed, the helix is designed based on Archimedes spiral equation, therefore the four arcses
Approx approach spiral of Archimedes；The outgassing direction of gas channel is set towards along the opening direction of spiral case inlet pressure, is effectively kept away
Exempted from the outgassing direction (i.e. the outgassing direction of spiral case) of gas channel straight up and caused by whole centrifugal blower fan system outlet
The problem of air-out has some setbacks, and airflow direction is chaotic, forms vortex, and noise is larger；Meanwhile the inner chamber radial width of spiral case is along spiral case
Molded line is incremented by from inside to outside, and the wind-guiding direction of air-guiding aisle and the outgassing direction of gas flow are set along same track and direction,
Air-guiding aisle is collectively forming the diffusion passage of one direction diffusion with gas flow, and this design enables the air-flow of impeller outlet to exist
Diffusion is carried out in circumference, spiral case internal gas flow velocity can be reduced, impeller outlet gas-flow resistance loss is reduced, reduces to greatest extent
Outlet turbulent flow phenomenon, air-flow refluence is prevented, phenomena such as airflow direction conflict produces whirlpool, has made air-out smooth, increase wind
Amount and blast, reduce noise.
Preferably, the vertical range in the outlet face of the air-guiding aisle to the outlet face of gas flow is more than 150mm.Lead
The vertical range L in the outlet face of wind passage to the outlet face of gas flow is more than 150mm, and the design advantageously reduces outlet turbulent flow
Phenomenon, the performance of whole system are good.
Preferably, the angle of flare α of the volute outlet is 20~40 °.The angle of flare of volute outlet is snail tongue on spiral case
Angle between the tangent line and impeller longitudinal centre line of upper fillet.
Preferably, the air-guiding aisle exit width is at least 1.2 times of gas flow exit width.Air-guiding aisle goes out
Mouth width D 1 is at least 1.2 times of gas flow exit width D2, and air-out is smooth.
Preferably, the impeller blade number is 65~75.Existing impeller blade number is 60~65, and in the present invention
Impeller blade number scope be 65~75, the increase of the number of blade can increase leaf road outlet pressure, lift blower fan system performance,
And the impeller blade number of the quantitative range and the matching of the present invention are optimal.
Preferably, the ratio between the internal diameter of the impeller blade and external diameter are 0.84~0.87.The internal diameter of impeller blade with it is outer
The ratio between footpath (also referred to as impeller impeller diameter ratio) is 0.84~0.87, the good combination property such as the air quantity of system, blast, noise.
Preferably, the air-ducting ring includes ventilating duct and loop connecting side, ventilating duct is fixed on the loop connecting side
On edge outer circumference surface away from impeller one end, impeller internal is stretched into and less than the end face outside of impeller in the free end of ventilating duct.
Loop connecting side is bonded with spiral case to be screwed, and impeller internal is stretched into and less than the outboard end of impeller in the free end of ventilating duct
Face, reduce the pressure loss of the impeller in air inlet, lift centrifugal blower pressure, and can effectively prevent impeller when high speed rotates
Impeller upper surface has grease and throws away phenomenon.
Preferably, the ventilating duct and loop connecting side are homogeneity integrative-structure.
Therefore, the present invention has the advantages that：
(1) outgassing direction of gas channel is set towards along the opening direction of spiral case inlet pressure, effectively prevent gas channel
Outgassing direction (i.e. the outgassing direction of spiral case) whole centrifugal blower fan system outlet air-out caused by straight up has some setbacks, air-flow
The problem of direction is chaotic, forms vortex, and noise is larger；
(2) the outer margin contour line of spiral case is the helix that is made up of tetra- sections of connected arc sections of AB, BC, CD, DE, the outer rim
Contour line forms the spiral case inlet pressure of spiral case, and the inner chamber radial width of spiral case is incremented by from inside to outside along spiral case inlet pressure, air-guiding aisle
The outgassing direction of wind-guiding direction and gas flow is set along same track and direction, and air-guiding aisle is collectively forming list with gas flow
The diffusion passage of direction diffusion, this design enable the air-flow of impeller outlet to carry out diffusion in the circumferential, can reduce spiral case
Internal gas flow velocity, impeller outlet gas-flow resistance loss is reduced, reduces outlet turbulent flow phenomenon to greatest extent, has prevented air-flow and fallen
Stream, phenomena such as airflow direction conflict produces whirlpool, make air-out smooth, increase air quantity and blast, reduce noise；
(3) to the outlet face of air-guiding aisle to the vertical range in outlet face of gas flow, the angle of flare of volute outlet, wind
Design is optimized in channel outlet width, impeller blade number so that the good combination property such as the air quantity of system, blast, noise；
(4) free end of ventilating duct stretches into impeller internal and less than the end face outside of impeller, reduces impeller in air inlet
The pressure loss, lift centrifugal blower pressure, and can effectively prevent impeller and have grease when high speed rotates and get rid of in impeller upper surface
Occur as.
Brief description of the drawings
Fig. 1 is a kind of exploded view of the present invention.
Fig. 2 is a kind of assembling schematic diagram of spiral case and impeller in the present invention.
Fig. 3 is a kind of sectional arrangement drawing of the present invention.
In figure：Spiral case 1, impeller 2, direct current variable frequency motor 3, gas flow 4, air outlet seat 5, air-guiding aisle 6, ventilating duct 7, ring
Shape connects side 8.
Embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
A kind of centrifugal blower fan system for range hood as shown in Figure 1 and Figure 2, including spiral case 1, in spiral case
Impeller 2, the direct current variable frequency motor 3 being connected in spiral case and with impeller and the air-ducting ring located at spiral case both sides, impeller blade
Number is 65~75, and the ratio between internal diameter and external diameter of impeller blade are 0.84~0.87, the outer margin contour line of spiral case for by AB, BC,
The helix that arc section connected tetra- sections of CD, DE is formed, the outer margin contour line form the spiral case inlet pressure of spiral case, volute outlet diffusion
Angle α is 20~40 °, and the inner chamber radial width of spiral case is incremented by from inside to outside along spiral case inlet pressure, and the inner chamber forms spiral helicine gas
Runner 4, the outgassing direction of gas channel are set towards along the opening direction of spiral case inlet pressure, be provided with the outside of the gas outlet of gas flow with
The air outlet seat 5 that spiral case is fixed, air outlet seat is interior to be provided with air-guiding aisle 6, the wind-guiding direction of air-guiding aisle and the outlet side of gas flow
The diffusion passage of one direction diffusion is collectively forming with gas flow to along same track and direction setting, air-guiding aisle, wind-guiding leads to
The vertical range L in the outlet face in road to the outlet face of gas flow is more than 150mm, and air-guiding aisle exit width D1 is at least gas
1.2 times of runner exit width D 2, air-ducting ring include ventilating duct 7 and loop connecting side 8, and the outer ledge of ventilating duct stretches out
Shape connection side is formed, loop connecting side is fixed on edge outer circumference surface of the ventilating duct away from impeller one end, the freedom of ventilating duct
End stretches into impeller internal and less than the end face outside of impeller (see Fig. 3).
The gas flow that gas enters in spiral case through air-ducting ring, impeller, the outgassing direction of gas channel is towards along spiral case inlet pressure
Opening direction set, effectively prevent the outgassing direction (i.e. the outgassing direction of spiral case) of gas channel straight up and caused by
The problem of whole centrifugal blower fan system outlet air-out has some setbacks, and airflow direction is chaotic, forms vortex, and noise is larger；Meanwhile spiral case
Inner chamber radial width along spiral case inlet pressure from inside to outside be incremented by, the wind-guiding direction of air-guiding aisle and the outgassing direction edge of gas flow
Same track and direction are set, and air-guiding aisle is collectively forming the diffusion passage of one direction diffusion with gas flow, and this design makes
Diffusion can be carried out in the circumferential by obtaining the air-flow of impeller outlet, can reduce spiral case internal gas flow velocity, reduce impeller outlet air-flow
Drag losses, reduce outlet turbulent flow phenomenon to greatest extent, prevent air-flow refluence, it is existing that airflow direction conflict produces whirlpool etc.
As making air-out smooth, increasing air quantity and blast, reduce noise.
The centrifugal blower fan system for range hood of the present invention, design science is reasonable, and air-out is smooth, and air quantity is big, blast
Greatly, noise is low, is adapted to popularization and application.
Embodiment described above is a kind of preferable scheme of the present invention, not the present invention is made any formal
Limitation, there are other variants and remodeling on the premise of without departing from the technical scheme described in claim.
Claims (8)
1. a kind of centrifugal blower fan system for range hood, including spiral case (1), the impeller (2) in spiral case, located at spiral case
Interior and the direct current variable frequency motor (3) being connected with impeller and the air-ducting ring located at spiral case both sides, it is characterised in that the spiral case
Outer margin contour line is the helix being made up of tetra- sections of connected arc sections of AB, BC, CD, DE, and the outer margin contour line forms spiral case
Spiral case inlet pressure, the inner chamber radial width of the spiral case are incremented by from inside to outside along spiral case inlet pressure, and the inner chamber forms spiral helicine gas
Runner (4), the outgassing direction of the gas channel is set towards along the opening direction of spiral case inlet pressure, on the outside of the gas outlet of gas flow
Provided with the air outlet seat (5) fixed with spiral case, air-guiding aisle (6), the wind-guiding direction of the air-guiding aisle are provided with the air outlet seat
Set with the outgassing direction of gas flow along same track and direction, air-guiding aisle is collectively forming one direction diffusion with gas flow
Diffusion passage.
2. a kind of centrifugal blower fan system for range hood according to claim 1, it is characterised in that the wind-guiding leads to
The vertical range L in the outlet face in road to the outlet face of gas flow is more than 150mm.
3. a kind of centrifugal blower fan system for range hood according to claim 1, it is characterised in that the spiral case goes out
Mouth angle of flare α is 20~40 °.
4. a kind of centrifugal blower fan system for range hood according to claim 1, it is characterised in that the wind-guiding leads to
Outlet width D 1 in road is at least 1.2 times of gas flow exit width D2.
A kind of 5. centrifugal blower fan system for range hood according to claim 1, it is characterised in that the impeller leaf
Piece number is 65~75.
A kind of 6. centrifugal blower fan system for range hood according to claim 5, it is characterised in that the impeller leaf
The ratio between internal diameter and external diameter of piece are 0.84~0.87.
A kind of 7. centrifugal blower fan system for range hood according to claim 6, it is characterised in that the air-ducting ring
Including ventilating duct (7) and loop connecting side (8), it is cylindrical that edge of the ventilating duct away from impeller one end is fixed on the loop connecting side
On side face, impeller internal is stretched into and less than the end face outside of impeller in the free end of ventilating duct.
A kind of 8. centrifugal blower fan system for range hood according to claim 7, it is characterised in that the ventilating duct
And loop connecting side is homogeneity integrative-structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710863603.8A CN107503958A (en) | 2017-09-22 | 2017-09-22 | A kind of centrifugal blower fan system for range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710863603.8A CN107503958A (en) | 2017-09-22 | 2017-09-22 | A kind of centrifugal blower fan system for range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107503958A true CN107503958A (en) | 2017-12-22 |
Family
ID=60698573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710863603.8A Pending CN107503958A (en) | 2017-09-22 | 2017-09-22 | A kind of centrifugal blower fan system for range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107503958A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107906575A (en) * | 2017-12-28 | 2018-04-13 | 杭州老板电器股份有限公司 | Air intake device and kitchen ventilator |
| CN107940533A (en) * | 2018-01-10 | 2018-04-20 | 王伟森 | A kind of embedded integration stove |
| CN108412809A (en) * | 2018-03-23 | 2018-08-17 | 珠海格力电器股份有限公司 | Flow guide ring, centrifugal fan and air conditioner |
| CN108661918A (en) * | 2018-07-16 | 2018-10-16 | 上海瑞晨环保科技有限公司 | Closed type self priming centrifugal pump |
| CN109990328A (en) * | 2017-12-29 | 2019-07-09 | 青岛海尔智能技术研发有限公司 | A kind of range hood and its fan assembly |
| CN110857790A (en) * | 2018-08-23 | 2020-03-03 | 宁波方太厨具有限公司 | Range hood with current collector |
| CN112109524A (en) * | 2019-06-20 | 2020-12-22 | 郑州宇通客车股份有限公司 | Automobile-used top window and vehicle |
| CN113426793A (en) * | 2021-05-18 | 2021-09-24 | 武汉理工大学 | Welding smoke and dust device that induced drafts based on air multiplication technique |
| CN113915146A (en) * | 2020-07-07 | 2022-01-11 | 华为技术有限公司 | Centrifugal fan and electronic equipment |
| WO2022062043A1 (en) * | 2020-09-25 | 2022-03-31 | 佛山市顺德区美的洗涤电器制造有限公司 | Centrifugal fan and range hood |
| US20230135382A1 (en) * | 2021-11-04 | 2023-05-04 | Lg Electronics Inc. | Ventilation device |
| WO2024193065A1 (en) * | 2023-03-17 | 2024-09-26 | 芜湖美的智能厨电制造有限公司 | Oil fume purification device and oil fume suction system having same |
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| CN207513872U (en) * | 2017-09-22 | 2018-06-19 | 杭州德意电器股份有限公司 | A kind of centrifugal blower fan system |
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| CN104179728A (en) * | 2014-08-22 | 2014-12-03 | 广东海信家电有限公司 | Multi-wing centrifugal fan |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107906575A (en) * | 2017-12-28 | 2018-04-13 | 杭州老板电器股份有限公司 | Air intake device and kitchen ventilator |
| CN109990328B (en) * | 2017-12-29 | 2023-12-26 | 青岛海尔智能技术研发有限公司 | Range hood and fan assembly thereof |
| CN109990328A (en) * | 2017-12-29 | 2019-07-09 | 青岛海尔智能技术研发有限公司 | A kind of range hood and its fan assembly |
| CN107940533A (en) * | 2018-01-10 | 2018-04-20 | 王伟森 | A kind of embedded integration stove |
| CN108412809A (en) * | 2018-03-23 | 2018-08-17 | 珠海格力电器股份有限公司 | Flow guide ring, centrifugal fan and air conditioner |
| CN108412809B (en) * | 2018-03-23 | 2024-04-12 | 珠海格力电器股份有限公司 | Flow guide ring, centrifugal fan and air conditioner |
| CN108661918A (en) * | 2018-07-16 | 2018-10-16 | 上海瑞晨环保科技有限公司 | Closed type self priming centrifugal pump |
| CN108661918B (en) * | 2018-07-16 | 2024-03-22 | 上海瑞晨环保科技股份有限公司 | Sealed self-priming centrifugal pump |
| CN110857790A (en) * | 2018-08-23 | 2020-03-03 | 宁波方太厨具有限公司 | Range hood with current collector |
| CN112109524A (en) * | 2019-06-20 | 2020-12-22 | 郑州宇通客车股份有限公司 | Automobile-used top window and vehicle |
| CN113915146A (en) * | 2020-07-07 | 2022-01-11 | 华为技术有限公司 | Centrifugal fan and electronic equipment |
| WO2022062043A1 (en) * | 2020-09-25 | 2022-03-31 | 佛山市顺德区美的洗涤电器制造有限公司 | Centrifugal fan and range hood |
| CN113426793A (en) * | 2021-05-18 | 2021-09-24 | 武汉理工大学 | Welding smoke and dust device that induced drafts based on air multiplication technique |
| US20230135382A1 (en) * | 2021-11-04 | 2023-05-04 | Lg Electronics Inc. | Ventilation device |
| WO2024193065A1 (en) * | 2023-03-17 | 2024-09-26 | 芜湖美的智能厨电制造有限公司 | Oil fume purification device and oil fume suction system having same |
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Address after: 311121 98 Hongxing Road, Qiao Nan block, Xiaoshan economic and Technological Development Zone, Hangzhou, Zhejiang Applicant after: HANGZHOU DE&E ELECTRICAL Co.,Ltd. Address before: 311121 98 Hongxing Road, Qiao Nan block, Xiaoshan economic and Technological Development Zone, Hangzhou, Zhejiang Applicant before: HANGZHOU DE&E ELECTRICAL Co.,Ltd. |
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Application publication date: 20171222 |
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