CN207317048U - A kind of frequency conversion noise reduction outlet housing of range hood - Google Patents
A kind of frequency conversion noise reduction outlet housing of range hood Download PDFInfo
- Publication number
- CN207317048U CN207317048U CN201721434107.2U CN201721434107U CN207317048U CN 207317048 U CN207317048 U CN 207317048U CN 201721434107 U CN201721434107 U CN 201721434107U CN 207317048 U CN207317048 U CN 207317048U
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- Prior art keywords
- noise reduction
- pedestal
- range hood
- reduction cavity
- outer cover
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Abstract
A kind of frequency conversion noise reduction outlet housing of range hood, including pedestal, inner cover and outer cover, the noise reduction hole being circumferentially sequentially distributed is provided with inner cover perisporium, it is equipped with and the one-to-one noise reduction cavity group in noise reduction hole on outer cover inner wall, each noise reduction cavity group, which includes at least, two unit noise reduction cavities, the circumferentially unidirectional change successively of the volume size of unit noise reduction cavity in same noise reduction cavity group, and the change direction of the volume size of the unit noise reduction cavity in adjacent noise reduction cavity group is consistent, it is provided with pedestal for driving driving mechanism that is built-in and covering on circumferential generation relative motion outside, it and can be engaged same noise reduction hole and the noise reduction cavity of the different volumes size in corresponding noise reduction cavity group under driving mechanism driving.When range hood works, inner cover different rotation angle is made noise reduction hole corresponds to the unit noise reduction cavity of different volumes, the wind frequency of making an uproar of the different stalls generation of the resonant frequency and range hood of noise reduction cavity can be made identical or match, so as to fulfill effective noise reduction.
Description
Technical field
A kind of outlet housing of range hood is the utility model is related to, is gone out more particularly, to a kind of frequency conversion noise reduction of range hood
Fan housing.
Background technology
The Chinese way of cooking can produce substantial amounts of oil smoke, for keep kitchen environment cleaning and human body health, range hood into
For one of essential equipment in Modern Family kitchen.Range hood sucks gas in its air inlet in the process of running, via
Fan outlet discharges gas.Existing range hood is generally fitted with outlet housing in fan outlet, and outlet housing has
The effect of gather qi together water conservancy diversion, connection range hood and discharge pipe.The air-flow that wind turbine produces finally is required for converging in outlet housing, this
The air-flow in outlet housing is just set excessively to concentrate, the air motion in cover body produces turbulent flow and makes a noise, and then influences people's
Culinary art experience and health.
Noise caused by outlet housing is flowed through in order to reduce air-flow, people improve the structure of outlet housing.As specially
Profit number is disclosed in the Chinese invention patent of 200810061936.X (Authorization Notice No. is CN 101294725B)《With having
The ventilator air outlet cover of source decrease of noise functions》, which includes cover body, cover body have an air outlet and with spiral case outlet air end
The air inlet of mouth connection, the perisporium of cover body is shiny surface, and perisporium has upwardly extended volute tongue by air inlet.Although the outlet housing leads to
Cross after cover body perisporium designs volute tongue, in addition the spiral case outlet air port that can make to be connected with outlet housing is without designing volute tongue, structure
Simplify, and the active noise reduction function of outlet housing is realized using volute tongue, still, which passes through volute tongue noise reduction, noise reduction
Effect is general.And for example the Chinese utility model of Patent No. 201620102678.5 (Authorization Notice No. CN205536022U) is special
Disclosed in profit《A kind of outlet housing for range hood》, which includes cover body bottom and cover body head, cover body bottom
For air intake, cover body head is outlet air end, multiple through holes are provided with the perisporium on cover body head and make cover body head local or
Overall is in mesh-structured.Although the outlet housing is by imitating the injection of surrounding air, blending to reach noise reduction during wind turbine air draft
Fruit, still, the noise reduction reached by injection, blending are poor.In addition, the gear change of range hood can make wind make an uproar frequency
Change, and existing noise reduction measure cannot accordingly be adjusted according to wind turbine gear change, noise reduction is not intelligent enough, user
Experience poor.In conclusion need to be further improved existing outlet air cover structure.
Utility model content
Technical problem to be solved in the utility model is to be directed to above-mentioned state of the art, there is provided one kind can be according to wind turbine
Gear size adjusts the frequency conversion noise reduction outlet housing of the range hood of noise reduction cavity resonant frequency.
Technical solution is used by the utility model solves above-mentioned technical problem：The frequency conversion noise reduction outlet air of the range hood
Cover, including pedestal and the cover body on pedestal, it is characterised in that：The cover body includes inner cover and outer cover, in the inner cover
The noise reduction hole being circumferentially sequentially distributed is provided with perisporium, on the inner wall of the outer cover be equipped with circumferentially be sequentially distributed and with
The one-to-one noise reduction cavity group in noise reduction hole, each noise reduction cavity group, which includes at least, two unit noise reduction cavities, in same noise reduction cavity group
Unit noise reduction cavity the circumferentially unidirectional change successively, and the volume of the unit noise reduction cavity in adjacent noise reduction cavity group of volume size
The change direction of size is consistent, is provided with the pedestal for driving built-in and covering on circumferential produce relative motion outside
Driving mechanism, and can make same noise reduction hole and the noise reduction of the different volumes size in corresponding noise reduction cavity group under driving mechanism driving
Chamber is engaged.
In order to obtain more preferable noise reduction, the noise reduction hole equal decile on the circumferential and axial direction of the inner cover,
Correspondingly, the noise reduction cavity group equal decile on the circumferential and axial direction of outer cover.
Opposite it can be circumferentially rotated for the ease of outer cover and inner cover, the inner cover and outer cover are cylindrical structure.
As a preferred embodiment, the radial width of the adjacent cells noise reduction cavity in each noise reduction cavity group unidirectionally becomes successively
Change, and cavity depth remains unchanged.
As another preferred solution, the radial width of the adjacent cells noise reduction cavity in each noise reduction cavity group remains unchanged,
And cavity depth unidirectionally changes successively.
Driving mechanism can have various structures, it is preferable that and the driving mechanism includes motor, driving tooth and driven gear ring,
The motor is installed on pedestal, and the driving gear is provided with the output shaft of the motor, and the driven gear ring is installed on
On the inner cover lower edge, driven gear ring is meshed with the driving gear.
There can be a variety of mounting structures between inner cover and pedestal, it is preferable that the pedestal includes the first pedestal and second
Pedestal, is equipped with semicircular the first sliding groove on the first pedestal, is equipped with semicircular second sliding slot on the second pedestal, and described
One sliding slot and the second sliding slot form lower circular sliding slot with respect to split, and the lower concentric stroking channel opening is inside, the bottom of the inner cover
Portion's periphery wall convex, which is equipped with, is used for the spacing glidepath in lower circular sliding slot, and the driven gear ring is arranged on the glidepath
Lower section, accordingly, the driving gear and driven gear ring are all provided with the lower section of the pedestal.In this way, under driving mechanism driving,
Inner cover energy opposite base rotates.
There can be a variety of mounting structures between outer cover and pedestal, it is preferable that semi-circular shape is equipped with first pedestal
The first locating slot, be equipped with semicircular second locating slot on second pedestal, first locating slot and the second positioning
Groove forms lower circular locating slot with respect to split, and the lower circular locating slot opening upwards are simultaneously arranged on the outer of the lower circular sliding slot
Side, the bottom of the outer cover is spacing in the lower circular locating slot, also, the outer cover is fixed on the pedestal.
Preferably, which has further included outlet air mouth circle, and the inner cover is movably arranged in the outlet air mouth circle, described
Outer cover is fixed in the outlet air mouth circle.
Further preferably, the outlet air mouth circle includes the first outlet air mouth circle and the second outlet air mouth circle of the opposite split of energy,
The upper circular locating slot that outlet air mouth circle after split has the inside upper circular sliding slot of opening and Open Side Down, it is described circular fixed
Position groove is arranged on the outside of the upper circular sliding slot, the inner cover top peripheral wall convex be equipped be used for it is spacing circular described
Upper slide in sliding slot, the upper limit of the outer cover in the upper circular locating slot, also, outer cover be fixed on it is described go out
On the circle of air port.
Compared with prior art, the utility model has the advantage of：The frequency conversion noise reduction outlet housing of the range hood by
The noise reduction hole being circumferentially sequentially distributed is provided with the perisporium of inner cover, is equipped with and is circumferentially sequentially distributed simultaneously on the inner wall of outer cover
Noise reduction cavity group is corresponded with noise reduction hole, driving mechanism driving inner cover and outer cover make circumferentially opposed movement, noise reduction hole is corresponded to
The unit noise reduction cavity of different volumes, according to Helmholz resonance principle, when range hood works, by inner cover different rotation angle
Noise reduction hole is corresponded to the unit noise reduction cavity of different volumes, can produce the resonant frequency of noise reduction cavity and the different stalls of range hood
Raw wind frequency of making an uproar is identical or match, so as to fulfill effective noise reduction.
Brief description of the drawings
Fig. 1 is the structure diagram of the utility model embodiment one
Fig. 2 is the perspective exploded view of the utility model embodiment one；
Fig. 3 is the enlarged diagram of part A in Fig. 2；
Fig. 4 is the partial structural diagram of the utility model embodiment one；
Fig. 5 is the structure sectional view of the utility model embodiment one；
Fig. 6 is B-B phase sectional views in Fig. 5；
Fig. 7 is the enlarged diagram of C portion in Fig. 5；
Fig. 8 is the enlarged diagram of D parts in Fig. 6；
Fig. 9 is structure diagram of the utility model embodiment one when range hood high tap position is run；
Figure 10 is structure diagram of the utility model embodiment one when range hood low-grade location is run；
Figure 11 is the structure diagram of the utility model embodiment two；
Figure 12 is structure diagram of the utility model embodiment two when range hood high tap position is run；
Figure 13 is structure diagram of the utility model embodiment two when range hood low-grade location is run；
Figure 14 is the structure diagram of the outer cover of the utility model embodiment three.
Embodiment
The utility model is described in further detail below in conjunction with attached drawing embodiment.
Embodiment one：
As shown in Figures 1 to 8, the frequency conversion noise reduction outlet housing of the range hood in the present embodiment includes pedestal 1, inner cover 2, outer
Primary clustering, the upper and lower ends of inner cover 2 such as cover 3, outlet air mouth circle 4 and driving mechanism 5 are movably arranged on outlet air mouth circle 4 and base respectively
On seat 1, the upper and lower ends of outer cover 3 are separately fixed in outlet air mouth circle 4 and pedestal 1, and driving mechanism 5 is installed on pedestal 1, driving
Mechanism 5 drives inner cover 2 to be circumferentially rotated with respect to outer cover 3.
Inner cover 2 is cylindrical structure, and the noise reduction hole 21 being circumferentially sequentially distributed, this implementation are provided with the perisporium of inner cover 2
In example, noise reduction hole 21 is circular hole, and noise reduction hole 21 is in the circumferentially and axially equal decile on direction of inner cover.
Outer cover 3 is cylindrical structure, is equipped with and is circumferentially sequentially distributed and a pair of with noise reduction hole 21 1 on the inner wall of outer cover 3
Answer noise reduction cavity group 31.In the present embodiment, noise reduction cavity group 31 is in the circumferentially and axially equal decile on direction of outer cover 3, each drop
The structure for chamber group 31 of making an uproar is identical and in circumferential tandem array successively, each noise reduction cavity group 31 include three it is mutually isolated,
Non-interfering unit noise reduction cavity 311, and the circumferentially unidirectional change successively of the volume size of these three unit noise reduction cavities 311,
And the change direction of the volume size of the unit noise reduction cavity 311 in adjacent noise reduction cavity group 31 is consistent.In the present embodiment, each drop
The radial width of adjacent cells noise reduction cavity 311 in chamber group 31 of making an uproar unidirectionally changes successively, and cavity depth remains unchanged.
As shown in Figure 3 and Figure 5, in a noise reduction cavity group 31, the noise reduction cavity of volume minimum is represented with a, the drop of volume maximum
Chamber of making an uproar represents that volume noise reduction cavity placed in the middle is represented with b with c.
Driving mechanism 5 includes motor 51, driving gear 52 and driven gear ring 53, and motor 51 is installed on pedestal 1, driving tooth
Wheel 52 is provided with the output shaft of motor 51, and driven gear ring 53 is installed on 2 lower edge of inner cover, driven gear ring 53 and driving gear
52 are meshed, in this way, motor 51 can drive inner cover 2 to rotate when rotating.
Inner cover 2 and the connection structure of pedestal 1 are as follows：Pedestal 1 is put together relatively by the first pedestal 11 and the second pedestal 12.
Semicircular the first sliding groove 111 is equipped with the first pedestal 11, semicircular second sliding slot 121 is equipped with the second pedestal 12,
111 and second sliding slot 121 of the first sliding groove forms lower circular sliding slot with respect to split, and lower concentric stroking channel opening is inside.The bottom of inner cover 2
Portion's periphery wall convex, which is equipped with, is used for the spacing glidepath 22 in lower circular sliding slot, and driven gear ring 53 is arranged under glidepath 22
Side, accordingly, driving gear 52 and driven gear ring 53 are arranged on the lower section of pedestal 1.
Outer cover 3 and the connection structure of pedestal 1 are as follows：The first locating slot 112 of semi-circular shape is equipped with the first pedestal 11,
Semicircular second locating slot 122, the 122 opposite split of the first locating slot 112 and the second locating slot are equipped with the second pedestal 12
And lower circular locating slot is formed, lower circular locating slot opening upwards are simultaneously spacing arranged on the outside of lower circular sliding slot, the bottom of outer cover 3
In lower circular locating slot, also, outer cover 3 is fixed on pedestal 1 by screw 6.
Inner cover 2, outer cover 3 and the connection structure of outlet air mouth circle 4 are as follows：Outlet air mouth circle 4 is by the first outlet air mouth circle 41 and second
Outlet air mouth circle 42 is opposite to be put together, and the outlet air mouth circle 4 after split has an inside upper circular sliding slot of opening and Open Side Down
Upper circular locating slot, upper circular locating slot are arranged on the outside of upper circular sliding slot, and 2 top peripheral wall convex of inner cover, which is equipped with, to be used for limiting
Upper slide 23 of the position in upper circular sliding slot, the upper limit of outer cover 3 is in upper circular locating slot, also, outer cover 3 passes through screw
6 are fixed in outlet air mouth circle 4.
According to Helmholz resonance principle, the resonant frequency of each independent noise reduction cavity isC is the velocity of sound, and S is
Corresponding 21 area of noise reduction hole, V is noise reduction cavity volume, and L is 21 effective neck length of noise reduction hole.It is it follows that constant in other parameters
In the case of, 311 volume of unit noise reduction cavity becomes larger, and resonant frequency f reduces, conversely, 311 volume of unit noise reduction cavity diminishes, resonance frequency
Rate f becomes larger.Using Helmholz resonance noise reduction principle, the air column in noise reduction hole 21 and the air structure in unit noise reduction cavity 311
Into elastic resonator system, when the partial noise frequency of range hood is identical with the intrinsic frequency of this resonator system, in noise reduction
Air column in hole 21 occurs resonance and severe friction occurs with hole wall, and friction makes acoustic energy be converted into thermal energy, so as to reach noise elimination
Purpose.
In the present embodiment, noise reduction cavity group 31 corresponds to three unit noise reduction cavities 311, correspond to respectively range hood height,
In, low three gears.
As shown in Figure 9 and Figure 10, when range hood is in high tap position operation, air quantity is maximum, and wind speed is most fast, and wind is made an uproar frequency
Maximum, at this time, rotates the noise reduction cavity a for the volume minimum that inner cover 2 makes each noise reduction hole 21 correspond to outer cover 3, according to Helmholtz
Resonance principle, volume is smaller, and resonant frequency is bigger, and the resonant frequency and high tap position wind of corresponding minimum volume are made an uproar, and frequency is identical or phase
Matching；When range hood is in low-grade location work, air quantity is minimum, and wind speed is minimum, and wind is made an uproar, and frequency is minimum, and at this time, rotating inner cover 2 makes
Each noise reduction hole 21 corresponds to the noise reduction cavity c of the volume maximum of outer cover 3, and according to Helmholz resonance principle, volume is bigger, resonance frequency
Rate is smaller, and the resonant frequency and low-grade location wind of corresponding maximum volume frequency of making an uproar are identical or match；Range hood is in middle gear
During the work of position, rotating inner cover makes each noise reduction hole correspond to volume size noise reduction cavity placed in the middle, its principle is no longer repeated.
Further, since everyone sensitivity to noise is different, can also when range hood is in same gear
By frequency conversion, to reduce the noise of different bandwidths.
Embodiment two：
As shown in Figure 11 to Figure 13, each noise reduction cavity group 31 of the outlet housing in the present embodiment includes two unit noise reductions
Chamber 311, the radial width of two unit noise reduction cavities 311 is identical, and cavity depth is different, thus makes unit noise reduction cavity 311
Volume changes, and for the ease of distinguishing, the deeper unit noise reduction cavity 311 of depth is represented with d, the shallower unit noise reduction of depth
Chamber 311 is represented with e.
As shown in figure 12, when range hood is in high tap position operation, noise reduction hole 21 corresponds to unit noise reduction cavity e；
As shown in figure 13, when range hood is in low-grade location operation, noise reduction hole 21 corresponds to unit noise reduction cavity d；
Its specific principle of noise reduction is identical with embodiment one, herein not reinflated description.
In addition, the driving mechanism 5 in the present embodiment replaces the driving gear 52 in embodiment one, remaining structure with screw rod 54
It is identical with embodiment one.
Embodiment three：
As shown in figure 14, the unit noise reduction cavity 311 in the outer cover 3 of the outlet housing in the present embodiment is axially through adjacent
Two unit noise reduction cavities 311 form noise reduction cavity group 31, and the cavity depth of two unit noise reduction cavities 311 in noise reduction cavity group 31
It is different.Its operation principle is identical with embodiment one, herein not reinflated description.
Above description is merely a prefered embodiment of the utility model, it is noted that for those of ordinary skill in the art
For, under the premise of the principle of the utility model is not departed from, a variety of remodeling or improvement can be carried out to the utility model, such as,
Noise reduction hole is except that using in addition to circular hole, can also use the hole of other shapes, and for example, according to range hood gear number, one group
Noise reduction cavity group can set the unit noise reduction cavity of corresponding number, these are regarded as within the scope of protection of the utility model.
Claims (9)
1. a kind of frequency conversion noise reduction outlet housing of range hood, including pedestal (1) and the cover body on pedestal, it is characterised in that：
The cover body includes inner cover (2) and outer cover (3), and the noise reduction being circumferentially sequentially distributed is provided with the perisporium of the inner cover (2)
Hole (21), on the inner wall of the outer cover (3) be equipped with circumferentially be sequentially distributed and with noise reduction hole (21) one-to-one noise reduction
Chamber group (31), each noise reduction cavity group (31), which includes at least, two unit noise reduction cavities (311), the list in same noise reduction cavity group (31)
The circumferentially unidirectional change successively, and the unit noise reduction cavity in adjacent noise reduction cavity group (31) of the volume size of first noise reduction cavity (311)
(311) change direction of volume size is consistent, is provided with the pedestal (1) for driving inner cover (2) and outer cover (3)
The driving mechanism (5) of relative motion is circumferentially being produced, and can make same noise reduction hole (21) and phase under the driving mechanism (5) driving
The noise reduction cavity (311) of the different volumes size in noise reduction cavity group (31) is answered to be engaged.
2. the frequency conversion noise reduction outlet housing of range hood according to claim 1, it is characterised in that：The noise reduction hole (21) exists
Equal decile on the circumferential and axial direction of the inner cover (2), correspondingly, the noise reduction cavity group (31) outer cover (3) circumferential direction and
Equal decile on axial direction.
3. the frequency conversion noise reduction outlet housing of range hood according to claim 1, it is characterised in that：Each noise reduction cavity group (31)
In the radial width of adjacent cells noise reduction cavity (311) unidirectionally change successively, and cavity depth remains unchanged.
4. the frequency conversion noise reduction outlet housing of range hood according to claim 1, it is characterised in that：Each noise reduction cavity group (31)
In the radial width of adjacent cells noise reduction cavity (311) remain unchanged, and cavity depth unidirectionally changes successively.
5. the frequency conversion noise reduction outlet housing of the range hood according to any claim in Claims 1-4, its feature exist
In：The driving mechanism (5) includes motor (51), driving gear (52) and driven gear ring (53), and the motor (51) is installed on
On pedestal (1), the driving gear (52) is provided with the output shaft of the motor (51), and the driven gear ring (53) is installed on
On inner cover (2) lower edge, driven gear ring (53) is meshed with the driving gear (52).
6. the frequency conversion noise reduction outlet housing of range hood according to claim 5, it is characterised in that：Pedestal (1) bag
The first pedestal (11) and the second pedestal (12) are included, semicircular the first sliding groove (111) is equipped with the first pedestal (11), second
Pedestal (12) is equipped with semicircular second sliding slot (121), the first sliding groove (111) and the second sliding slot (121) with respect to split
And lower circular sliding slot is formed, the lower concentric stroking channel opening is inside, and the bottom periphery wall convex of the inner cover (2), which is equipped with, to be used for
The spacing glidepath (22) in lower circular sliding slot, the driven gear ring (53) is arranged on the lower section of the glidepath (22), corresponding
Ground, the driving gear (52) and driven gear ring (53) are arranged on the lower section of the pedestal (1).
7. the frequency conversion noise reduction outlet housing of range hood according to claim 6, it is characterised in that：In first pedestal
(11) the first locating slot (112) of semi-circular shape is equipped with, the semicircular second positioning is equipped with second pedestal (12)
Groove (122), first locating slot (112) and the second locating slot (122) form lower circular locating slot with respect to split, under described
Circular locating slot opening upwards are simultaneously spacing under described arranged on the outside of the lower circular sliding slot, the bottom of the outer cover (3)
In circular locating slot, also, the outer cover (3) is fixed on the pedestal (1).
8. the frequency conversion noise reduction outlet housing of range hood according to claim 6, it is characterised in that：Outlet air mouth circle is further included
(4), the inner cover (2) is movably arranged on the outlet air mouth circle (4), and the outer cover (3) is fixed on the outlet air mouth circle (4)
On.
9. the frequency conversion noise reduction outlet housing of range hood according to claim 8, it is characterised in that：The outlet air mouth circle
(4) the first outlet air mouth circle (41) and the second outlet air mouth circle (42) of the opposite split of energy are included, the outlet air mouth circle (4) after split has
The inside upper circular sliding slot of opening and the upper circular locating slot that Open Side Down, the upper circular locating slot are arranged on the upper concentric stroking
The outside of groove, inner cover (2) the top peripheral wall convex are equipped with the upper slide being used in spacing sliding slot circular described
(23), the upper limit of the outer cover (3) is in the upper circular locating slot, also, outer cover (3) is fixed on the air outlet
Enclose on (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721434107.2U CN207317048U (en) | 2017-10-31 | 2017-10-31 | A kind of frequency conversion noise reduction outlet housing of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721434107.2U CN207317048U (en) | 2017-10-31 | 2017-10-31 | A kind of frequency conversion noise reduction outlet housing of range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207317048U true CN207317048U (en) | 2018-05-04 |
Family
ID=62379491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721434107.2U Withdrawn - After Issue CN207317048U (en) | 2017-10-31 | 2017-10-31 | A kind of frequency conversion noise reduction outlet housing of range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207317048U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240649A (en) * | 2017-10-31 | 2018-07-03 | 宁波方太厨具有限公司 | A kind of frequency conversion noise reduction outlet housing of range hood |
| CN110542128A (en) * | 2018-05-28 | 2019-12-06 | 青岛海尔智能技术研发有限公司 | range hood |
-
2017
- 2017-10-31 CN CN201721434107.2U patent/CN207317048U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240649A (en) * | 2017-10-31 | 2018-07-03 | 宁波方太厨具有限公司 | A kind of frequency conversion noise reduction outlet housing of range hood |
| CN108240649B (en) * | 2017-10-31 | 2024-01-16 | 宁波方太厨具有限公司 | Variable-frequency noise-reduction air outlet cover of range hood |
| CN110542128A (en) * | 2018-05-28 | 2019-12-06 | 青岛海尔智能技术研发有限公司 | range hood |
| CN110542128B (en) * | 2018-05-28 | 2021-03-05 | 青岛海尔智能技术研发有限公司 | Fume exhaust fan |
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