CN110274271A - A kind of noise reducing type range hood - Google Patents
A kind of noise reducing type range hood Download PDFInfo
- Publication number
- CN110274271A CN110274271A CN201810205739.4A CN201810205739A CN110274271A CN 110274271 A CN110274271 A CN 110274271A CN 201810205739 A CN201810205739 A CN 201810205739A CN 110274271 A CN110274271 A CN 110274271A
- Authority
- CN
- China
- Prior art keywords
- noise reduction
- orifice plate
- range hood
- parting bead
- front shroud
- 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
- 230000009467 reduction Effects 0.000 claims abstract description 94
- 239000011324 bead Substances 0.000 claims abstract description 36
- 239000003517 fume Substances 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 2
- 230000003044 adaptive effect Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000010411 cooking Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000779 smoke Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 239000007787 solid 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
- 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
- F04D29/663—Sound attenuation
-
- 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)
- Air-Flow Control Members (AREA)
- Ventilation (AREA)
Abstract
A kind of noise reducing type range hood, denoising device is installed on blower cover board, denoising device includes noise reduction orifice plate, the gentle kickboard of front shroud, noise reduction orifice plate leading flank is equipped with the first parting bead being spaced apart up and down, front shroud trailing flank is equipped with the second parting bead being spaced apart up and down, first parting bead and the second parting bead are spaced apart from each other distribution, noise reduction cavity is formed between adjacent the first parting bead and the second parting bead, each noise reduction cavity is corresponding at least one noise reduction hole, and air bearing plate drives noise reduction orifice plate and front shroud relative motion to reduce noise reduction cavity volume under air intake passage gas shock.In this way, the relative motion up and down that may be implemented between noise reduction orifice plate and front shroud is moved upwards after by airflow function by air bearing plate, and the volume of noise reduction cavity is made to become smaller, and, wind speed is bigger, noise reduction cavity volume becomes smaller, the frequency Auto-matching so that the wind for generating the resonant frequency of noise reduction cavity and the different stalls of range hood is made an uproar, it is possible thereby to realize the adaptive stepless frequency conversion noise reduction of range hood.
Description
Technical field
The present invention relates to a kind of range hoods, more particularly, to a kind of noise reducing type range hood.
Background technique
The Chinese way of cooking can generate a large amount of oil smoke, and for the health for keeping kitchen environment cleaning and human body, range hood is had become
For one of essential equipment in Modern Family kitchen.In the process of running, air motion generates turbulent flow and issues range hood
Noise influences the culinary art experience and health of people.In order to reduce the noise of range hood, people have invented various with drop
The range hood for structure of making an uproar, such as the middle promulgated by the State Council of Patent No. 201310627547.X (Authorization Notice No. is CN 103697512B)
Sound-absorbing is arranged in the advance tuyere position of face spiral case in " a kind of silence exhauster for removing cooking fumes " disclosed in bright patent, the range hood
Micropore is arranged on sound-absorbing pod, and the rear panel in sound-absorbing pod face advance air port is obliquely installed for pod, makes it
Preceding oil smoke passway diameter between the advance air port of spiral case gradually becomes smaller from bottom to top, so that air-flow is accelerated, and be directed into
Enter the advance air port of spiral case.Although the micropore in the silence exhauster for removing cooking fumes plays the role of absorbing sound and lowering noise, rear panel inclination
Setting plays acceleration air-flow, so that it is rapidly entered the effect of air inlet, since the frequency noise of common range hood is main
It is distributed in 100HZ~2000HZ or so, belongs to low frequency noise, in above-mentioned patent although microwell plate sound absorption structure has good drop
The effect of making an uproar, but it is very strong to the selectivity of sound absorption frequency, only there are good absorption, sound absorption frequency to the noise near resonant frequency
With relatively narrow.
In addition, the Chinese way of cooking is complex changeable, such as frying boiling etc., so common range hood is usually provided with
Multiple gears, such as quick-fried shelves, top gear, low or first gear, mute file etc. are made with being supplied to when user cooks different dish
With.Obviously, when user uses different gears, the air quantity suction generated is different, and the noise generated is also different, and
The noise reduction measure of existing range hood cannot accordingly be adjusted according to blower gear change, can not be different according to blower gear
Carry out adaptive step-less adjustment, noise reduction effect not smart enoughization, user experience is poor.In conclusion needing to existing fume-exhausting
The denoising structure of machine is further improved.
Summary of the invention
The technical problem to be solved by the present invention is to be directed to above-mentioned state of the art, providing one kind can be according to blower not
Same gear carrys out the noise reducing type range hood of adaptive step-less adjustment noise reduction cavity resonant frequency.
The technical scheme of the invention to solve the technical problem is: the noise reducing type range hood, including blower rack
With the blower being set in blower rack, blower rack front side is equipped with blower cover board, is equipped with denoising device on the blower cover board,
Be characterized in that: the denoising device includes noise reduction orifice plate, the gentle kickboard of front shroud, is provided with noise reduction hole on the noise reduction orifice plate, drop
It makes an uproar and is formed with air intake passage between orifice plate and air inlet, the leading flank of noise reduction orifice plate is equipped be spaced apart up and down first
Parting bead, the front shroud are set to the front side of noise reduction orifice plate, and the trailing flank of front shroud is equipped with the second parting bead being spaced apart up and down,
First parting bead and the second parting bead are spaced apart from each other distribution, form noise reduction cavity, each drop between adjacent the first parting bead and the second parting bead
Chamber of making an uproar is corresponding with the noise reduction hole described at least one, and the air bearing plate is set in the air intake passage, and air bearing plate is in gas shock
It is lower one of plate another block of plate relatively in the noise reduction orifice plate and front shroud to be driven to move upwards to reduce the noise reduction
The volume of chamber.
Preferably, first parting bead and the second parting bead are horizontally disposed, and each noise reduction cavity is corresponding with row's noise reduction hole, and
Row's noise reduction hole is uniformly distributed along horizontal direction interval.
Further preferably, the volume of each noise reduction cavity is equal in magnitude.Also, the volume of noise reduction cavity, which can synchronize, to be become larger or becomes
It is small.
Further preferably, installation window compatible with the noise reduction orifice plate size, noise reduction are provided on the blower cover board
The trailing flank of orifice plate and the trailing flank of the blower cover board are in the same plane.In this way, noise reduction orifice plate will not enter the wind blower
Generate blocking.
As a preferred embodiment, the noise reduction orifice plate is movable plate, and the front shroud is fixed plate, the air bearing
Plate is set on the noise reduction orifice plate.In this way, air bearing plate can drive noise reduction orifice plate same upwards when airflow function is after on air bearing plate
Step movement.
Further preferably, the left and right sides of the noise reduction orifice plate is equipped with the connecting pin extended forward, in the front shroud
The bar shaped sliding slot for connecting pin insertion is provided on corresponding position, the bar shaped sliding slot is vertically distributed, in the bar shaped sliding slot
Top be equipped with fixed block, between the fixed block and connecting pin elasticity support be equipped with so that connecting pin is maintained the trend of moving downward
Elastic component.With such a structure, when air bearing plate is by airflow acting force, noise reduction orifice plate can be driven to sync up movement,
When airflow acting force disappears, under the elastic force effect of elastic component, noise reduction orifice plate can reset downwards.
Further preferably, the bottom of the fixed block is provided with blind hole, the front end of the connecting pin be equipped with it is right above and below blind hole
Neat through-hole, connecting shaft passes through the through-hole and top is mutually pushed up with blind hole, and the elastic component is to be set in the connecting shaft
Spring.In this way, spring installation is more reliable, elastic force is more stable.
Air bearing plate can be there are many mounting means, it is preferable that the air bearing plate is in a strip shape and along the noise reduction orifice plate
Lower edge distribution.
As another preferred embodiment, the noise reduction orifice plate is fixed plate, and the front shroud is movable plate, the gas
Kickboard is set on the front shroud.
Further preferably, which further includes having exhaust fume collecting hood, and the exhaust fume collecting hood is mounted under blower rack
Side, exhaust fume collecting hood have the air inlet being connected with air inlet.
Compared with the prior art, the advantages of the present invention are as follows: the noise reduction orifice plate in the noise reducing type range hood denoising device
The noise reduction cavity being sequentially distributed up and down is formed between front shroud, is provided with noise reduction corresponding with noise reduction cavity hole on noise reduction orifice plate, is led to
It crosses air bearing plate and moves upwards the relative motion up and down that may be implemented between noise reduction orifice plate and front shroud after by airflow function, and make to drop
The volume of chamber of making an uproar becomes smaller, moreover, wind speed is bigger, noise reduction cavity volume becomes smaller, to make resonant frequency and the oil suction of noise reduction cavity
The wind that the different stalls of smoke machine generate is made an uproar frequency Auto-matching, it is possible thereby to realize the adaptive stepless frequency conversion drop of range hood
It makes an uproar.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the structure sectional view of the embodiment of the present invention；
Fig. 3 is the schematic diagram of internal structure of the embodiment of the present invention；
Fig. 4 is the decomposition diagram of the denoising device of the embodiment of the present invention；
Fig. 5 is the noise reduction orifice plate of the embodiment of the present invention and the attachment structure schematic diagram of front shroud；
Fig. 6 is the enlarged diagram of part B in Fig. 5；
Fig. 7 is the decomposition diagram of connection structure shown in Fig. 5.
Fig. 8 is the enlarged diagram of C portion in Fig. 7；
Fig. 9 is structural schematic diagram of the embodiment of the present invention before air bearing plate does not rise；
Figure 10 is structural schematic diagram of the embodiment of the present invention after the rising of air bearing plate.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
It as shown in Figures 1 to 8, is preceding to noise reducing type range hood in the present embodiment with direction shown in arrow A in Fig. 2
Including blower rack 1, blower 2 is installed inside blower rack 1, the front side of blower 2 has air inlet 21, the front side of blower rack 1
Blower cover board 3 is installed, denoising device 4 is installed on blower cover board 3.Exhaust fume collecting hood 7 is installed, exhaust fume collecting hood 7 has below blower rack 1
There is the air inlet being connected with air inlet 21.
In the present embodiment, denoising device 4 includes the primary clusterings such as noise reduction orifice plate 41, the gentle kickboard 43 of front shroud 42.
Wherein, installation window 31 compatible with 41 size of noise reduction orifice plate is provided on blower cover board 3, noise reduction orifice plate 41 is to set
Movable plate on blower cover board 3, the trailing flank of noise reduction orifice plate 41 and the trailing flank of blower cover board 3 are in the same plane, drop
It makes an uproar and is formed with air intake passage 6 between orifice plate 41 and air inlet 21.The leading flank of noise reduction orifice plate 41 be equipped between the upper and lower every point
First parting bead 412 of cloth, horizontally disposed and adjacent 412 spacing of the first parting bead of the first parting bead 412 is equal, and adjacent two first
Noise reduction hole 411 is provided in bar-shaped zone between parting bead 412, and noise reduction hole 411 is uniformly distributed along horizontal direction interval.
Front shroud 42 is the fixed plate set on 41 front side of noise reduction orifice plate, and front shroud 42 is fixed on blower cover board 3.Front shroud
42 trailing flank is equipped with the second parting bead 421 being spaced apart up and down, and the second parting bead 421 is horizontally disposed with and the second adjacent parting bead
421 spacing are equal.Also, the second parting bead 421 and the first parting bead 412 are spaced apart from each other distribution, the first adjacent parting bead 412 and second
Noise reduction cavity 5 is formed between parting bead 421, in this way, the volume of each noise reduction cavity 5 is equal in magnitude, also, each noise reduction cavity 5 is corresponding with
The equally distributed noise reduction hole 411 in one row of horizontal interval.
Air bearing plate 43 is in a strip shape and is distributed along the lower edge of noise reduction orifice plate 41, and air bearing plate 43 is integrally located at air intake passage
In 6, air bearing plate 43 can drive noise reduction orifice plate 41 to sync up movement under the airflow function in air intake passage 6, to reduce drop
It makes an uproar the volume of chamber 5.
In the present embodiment, the specific connection structure between noise reduction orifice plate 41 and front shroud 42 is as follows:
The left and right sides of noise reduction orifice plate 41 is equipped with the connecting pin 413 extended forward, opens on the corresponding position of front shroud 42
There is the bar shaped sliding slot 422 being inserted into for connecting pin 413, bar shaped sliding slot 422 is vertically distributed, and is equipped in the top of bar shaped sliding slot 422 solid
Determine block 423, elasticity supports the bullet for being equipped with and connecting pin 413 being made to maintain the trend of moving downward between fixed block 423 and connecting pin 413
Spring 44.Also, the bottom of fixed block 423 is provided with blind hole 424, and the front end of connecting pin 413 is equipped with logical with 424 consistency from top to bottom of blind hole
Hole 414, connecting shaft 45 passes through the top of through-hole 414 and connecting shaft 45 and 424 phase top of blind hole, spring 44 are set in connecting shaft 45
On.
The working principle of the denoising device 4 of the range hood is as follows:
As shown in figure 9, air bearing plate 43 is in not by the original state of airflow acting force, at this point, the first parting bead 412 with it is corresponding
The second parting bead 421 between spacing it is maximum, correspondingly, the volume of noise reduction cavity 5 is maximum.
As shown in Figure 10, when range hood works, air bearing plate 43 moves up under the airflow function in air intake passage 6,
Noise reduction orifice plate 41 syncs up movement with air bearing plate 43, and the spacing between the first parting bead 412 and corresponding second parting bead 421 becomes
It is small, so that the volume of noise reduction cavity 5 be made to become smaller.With the rising of air bearing plate 43, spring 45 is compressed, and spring 45 is to connecting pin 413
Under the action of generating downwards, and then make the gentle kickboard 43 of noise reduction orifice plate 41 that there is the trend moved downward.
Wind speed is bigger, and the upward active force that air bearing plate 43 is subject to is bigger, and 43 climb of air bearing plate is bigger, to make noise reduction
The volume of chamber 5 is smaller.By Helmholz resonance principle it is found that in the case where other parameters are constant, noise reduction cavity volume becomes larger, altogether
Vibration frequency f reduces, conversely, noise reduction cavity volume becomes smaller, resonant frequency f becomes larger.As it can be seen that the noise reduction cavity of the range hood denoising device
The wind that resonant frequency can be generated with the different stalls of range hood be made an uproar frequency Auto-matching, to realize the adaptive of range hood
Stepless frequency conversion noise reduction.
The foregoing is merely the preferred embodiment of the present invention, it is noted that for those of ordinary skills,
Under the premise of not departing from the principle of the present invention, a variety of remodeling or improvement can be carried out to the present invention, for example, can be by noise reduction orifice plate
It is designed to fixed plate, front shroud is designed to that movable plate, air bearing plate are then set on front shroud, these are regarded as guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of noise reducing type range hood, the blower (2) including blower rack (1) and in blower rack, blower rack (1) front side are set
There are blower cover board (3), denoising device (4) are installed on the blower cover board (3), it is characterised in that: the denoising device (4)
It including noise reduction orifice plate (41), front shroud (42) gentle kickboard (43), is provided with noise reduction hole (411), drops on the noise reduction orifice plate (41)
It makes an uproar and is formed with air intake passage (6) between orifice plate (41) and air inlet (21), the leading flank of noise reduction orifice plate (41) is equipped with upper
Under the first parting bead (412) for being spaced apart, the front shroud (42) is set to the front side of noise reduction orifice plate (41), after front shroud (42)
Side is equipped with the second parting bead (421) for being spaced apart up and down, and the first parting bead (412) and the second parting bead (421) are spaced apart from each other point
Cloth, between adjacent the first parting bead (412) and the second parting bead (421) formed noise reduction cavity (5), each noise reduction cavity (5) be corresponding with to
Noise reduction hole (411) described in one few, the air bearing plate (43) are set in the air intake passage (6), and air bearing plate (43) is in air-flow
Impact is lower one of plate another block of plate relatively in the noise reduction orifice plate (41) and front shroud (42) can be driven to move upwards with
Reduce the volume of the noise reduction cavity (5).
2. noise reducing type range hood according to claim 1, it is characterised in that: first parting bead (412) and second every
Item (421) is horizontally disposed, and each noise reduction cavity (5) is corresponding with row's noise reduction hole (411), and row's noise reduction hole (411) is along dampening
It square is uniformly distributed to interval.
3. noise reducing type range hood according to claim 1, it is characterised in that: the volume size phase of each noise reduction cavity (5)
Deng.
4. noise reducing type range hood according to claim 1, it is characterised in that: be provided on the blower cover board (3) with
The compatible installation window (31) of noise reduction orifice plate (41) size, the trailing flank of noise reduction orifice plate (41) and the blower cover board (3)
Trailing flank it is in the same plane.
5. according to claim 1 to noise reducing type range hood described in any claim in 4, it is characterised in that: the drop
Orifice plate (41) are made an uproar as movable plate, the front shroud (42) is fixed plate, and the air bearing plate (43) is set on the noise reduction orifice plate.
6. noise reducing type range hood according to claim 5, it is characterised in that: the left and right sides of the noise reduction orifice plate (41)
Equipped with the connecting pin (413) extended forward, it is provided on the corresponding position of the front shroud (42) and is inserted for the connecting pin (413)
The bar shaped sliding slot (422) entered, the bar shaped sliding slot (422) are vertically distributed, and are equipped with and fix in the top of the bar shaped sliding slot (422)
Block (423), elasticity supports to be equipped with and maintains connecting pin to move downward between the fixed block (423) and connecting pin (413)
The elastic component of gesture.
7. noise reducing type range hood according to claim 6, it is characterised in that: the bottom of the fixed block (423) is provided with
Blind hole (424), the front end of the connecting pin (413) are equipped with the through-hole (414) with blind hole (424) consistency from top to bottom, connecting shaft (45)
Across the through-hole (414) and top is mutually pushed up with blind hole (424), and the elastic component is the bullet being set on the connecting shaft (45)
Spring (44).
8. noise reducing type range hood according to claim 5, it is characterised in that: the air bearing plate (43) it is in a strip shape and along
The lower edge of the noise reduction orifice plate (41) is distributed.
9. according to claim 1 to noise reducing type range hood described in any claim in 4, it is characterised in that: the drop
Orifice plate (41) are made an uproar as fixed plate, the front shroud (42) is movable plate, and the air bearing plate (43) is set to the front shroud (42)
On.
10. noise reducing type range hood according to claim 1, it is characterised in that: further include having exhaust fume collecting hood (7), the collection
Petticoat pipe (7) is mounted on the lower section of blower rack (1), and exhaust fume collecting hood (7) has the air inlet being connected with air inlet (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810205739.4A CN110274271B (en) | 2018-03-13 | 2018-03-13 | Noise-reducing type range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810205739.4A CN110274271B (en) | 2018-03-13 | 2018-03-13 | Noise-reducing type range hood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110274271A true CN110274271A (en) | 2019-09-24 |
| CN110274271B CN110274271B (en) | 2024-02-20 |
Family
ID=67958187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810205739.4A Active CN110274271B (en) | 2018-03-13 | 2018-03-13 | Noise-reducing type range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110274271B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020010183A (en) * | 2000-07-27 | 2002-02-04 | 이종훈 | Noise control apparatus for the air inlet or outlet |
| KR20130010335A (en) * | 2011-07-18 | 2013-01-28 | 한국철도기술연구원 | Diffraction noise reduction device for noise barrier upper edge using helmholtz resonance absorber |
| CN106321524A (en) * | 2016-11-18 | 2017-01-11 | 湖南核三力技术工程有限公司 | Damping, muffling and air compensation device for orifice plate |
| CN206330187U (en) * | 2016-12-29 | 2017-07-14 | 宁波方太厨具有限公司 | A kind of single air-inlet range hood |
| CN208090758U (en) * | 2018-03-13 | 2018-11-13 | 宁波方太厨具有限公司 | A kind of noise reducing type range hood |
-
2018
- 2018-03-13 CN CN201810205739.4A patent/CN110274271B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020010183A (en) * | 2000-07-27 | 2002-02-04 | 이종훈 | Noise control apparatus for the air inlet or outlet |
| KR20130010335A (en) * | 2011-07-18 | 2013-01-28 | 한국철도기술연구원 | Diffraction noise reduction device for noise barrier upper edge using helmholtz resonance absorber |
| CN106321524A (en) * | 2016-11-18 | 2017-01-11 | 湖南核三力技术工程有限公司 | Damping, muffling and air compensation device for orifice plate |
| CN206330187U (en) * | 2016-12-29 | 2017-07-14 | 宁波方太厨具有限公司 | A kind of single air-inlet range hood |
| CN208090758U (en) * | 2018-03-13 | 2018-11-13 | 宁波方太厨具有限公司 | A kind of noise reducing type range hood |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110274271B (en) | 2024-02-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210861270U (en) | Fume exhaust fan | |
| CN110160102A (en) | It is integrated with the downdraft kitchen ventilator of electromagnetic oven | |
| CN110274270A (en) | A kind of noise reducing type range hood | |
| CN208090758U (en) | A kind of noise reducing type range hood | |
| CN208090761U (en) | A kind of noise reducing type range hood | |
| CN110094775A (en) | A kind of noise reducing type range hood | |
| CN208170472U (en) | A kind of noise reducing type range hood | |
| CN208312474U (en) | A kind of noise reducing type range hood | |
| CN108240650B (en) | Variable-frequency noise-reduction air outlet cover of range hood | |
| CN110274273A (en) | A kind of noise reducing type range hood | |
| CN208090759U (en) | A kind of noise reducing type range hood | |
| CN110094774A (en) | A kind of noise reducing type range hood | |
| CN110274271A (en) | A kind of noise reducing type range hood | |
| CN109595648A (en) | A kind of range hood | |
| CN208090760U (en) | A kind of noise reducing type range hood | |
| CN207815423U (en) | A kind of range hood | |
| CN110274272B (en) | Noise-reducing type range hood | |
| CN208312473U (en) | A kind of noise reducing type range hood | |
| CN207907315U (en) | A kind of noise reducing type range hood | |
| CN207422307U (en) | A kind of range hood | |
| CN207317047U (en) | A kind of frequency conversion noise reduction outlet housing of range hood | |
| CN109405002B (en) | Range hood and control method thereof | |
| CN210511834U (en) | Lifting type machine head and integrated stove comprising same | |
| CN110274276A (en) | A kind of noise reducing type range hood | |
| CN207907314U (en) | A kind of noise reducing type range hood |
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 |