CN207317044U - 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
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- CN207317044U CN207317044U CN201721430304.7U CN201721430304U CN207317044U CN 207317044 U CN207317044 U CN 207317044U CN 201721430304 U CN201721430304 U CN 201721430304U CN 207317044 U CN207317044 U CN 207317044U
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- noise reduction
- inner cover
- range hood
- cover
- frequency conversion
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Abstract
A kind of frequency conversion noise reduction outlet housing of range hood, including pedestal, inner cover and outer cover, noise reduction hole is provided with inner cover perisporium, noise reduction hole is arranged in columns along the axial direction of inner cover, noise reduction cavity is equipped with outer cover inner wall, noise reduction cavity is along the axial alignment of outer cover into noise reduction cavity group, each noise reduction cavity group structure is identical, each noise reduction cavity group includes at least two noise reduction cavities and the volume of each noise reduction cavity unidirectionally changes from top to bottom, one of them in outer cover and inner cover is covered to be fixed, another is movable guard, the elastic component for making movable guard maintain the trend of moving downward is installed on movable guard, movable guard can be relatively fixed cover under the action of range hood exit flow and move up.Frequency conversion noise reduction outlet housing movable guard under air outlet for kitchen ventilator airflow function can be relatively fixed cover and move up, and the cooperation for passing through elastic component, noise reduction hole is set to correspond to the noise reduction cavity of respective volume under the working status of range hood different stalls, so as to fulfill the self-adapting frequency conversion noise reduction of outlet housing.
Description
Technical field
A kind of outlet housing of range hood is the utility model is related to, the frequency conversion more particularly, to a kind of range hood is dropped
Make an uproar outlet 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, can not be different according to wind turbine gear
Automatic adjusument is carried out, noise reduction is not intelligent enough, and user experience is poor.In conclusion need to existing outlet housing knot
Structure is further improved.
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 carrys out the frequency conversion noise reduction outlet housing of the range hood of automatic adjusument 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
Noise reduction hole is provided with perisporium, the noise reduction hole is arranged in columns along the axial direction of inner cover, and noise reduction cavity is equipped with the inner wall of the outer cover,
The noise reduction cavity is along the axial alignment of outer cover into noise reduction cavity group, and each noise reduction cavity group structure is identical, and each noise reduction cavity group is wrapped
The volume for including at least two noise reduction cavities and each noise reduction cavity unidirectionally changes from top to bottom, one of them in the outer cover and inner cover
Covered to be fixed, another is movable guard, and the elastic component for making movable guard maintain the trend of moving downward, institute are provided with movable guard
State movable guard and can be relatively fixed cover under the action of range hood exit flow and move up, and moving up and down by movable guard
The noise reduction hole can be made to correspond to the noise reduction cavity of respective volume under the working status of range hood different stalls.
As a preferred embodiment, the inner cover is movable guard, and the outer cover covers to be fixed, in each noise reduction cavity group
The volume of noise reduction cavity become larger from top to bottom.
In order to coordinate the range hood with two gears of height, each noise reduction cavity group includes the first noise reduction cavity and is located at
The second noise reduction cavity below first noise reduction cavity, and the volume of the first noise reduction cavity is less than the volume of the second noise reduction cavity.At range hood
When high tap position, noise reduction hole corresponds to the first noise reduction cavity of small volume, and when range hood is in low-grade location, noise reduction hole corresponds to
The second larger noise reduction cavity of volume.
Elastic component can have a variety of mounting structures, it is preferable that the outlet housing has further included outlet air mouth circle, on the inner cover top
Connection bolt is installed, the elastic component is the spring being set on the connection bolt, and described between portion and outlet air mouth circle
Spring is supported and is located between outlet air mouth circle and inner cover.
Outer cover can have a variety of installation fixed structures, it is preferable that the bottom of the outer cover is fixed on the pedestal, outer cover
Top be fixed in the outlet air mouth circle.
In order to enable inner cover to float upwards under the airflow function that cooking-fume exhauster blower exports, the inner wall of the inner cover is equipped with
Air-flow kickboard is extended internally to inner cover.
Further preferably, the inner cover top port forms the closing in portion to contract.In this way, make in fan outlet air-flow
Behind closing in portion, inner cover can be made to float upwards.
Further preferably, the air-flow kickboard is uniformly distributed along inner cover inner wall interval, so that inner cover is made by air-flow
Firmly it is more uniformly distributed.
More steady in order to move up and down inner cover, formation and the matched guide groove of inner cover, described on the pedestal
The bottom of inner cover is plugged in the guide groove all the time.
In order to obtain more preferable noise reduction, the noise reduction hole for belonging to same row is uniformly distributed in the axially spaced-apart of inner cover, and
And each column noise reduction hole is uniformly distributed in the circumferentially-spaced of inner cover.
As the preferred of any of the above-described scheme, the inner cover and outer cover are cylindrical structure.
Compared with prior art, the utility model has the advantage of：Have in the inner cover and outer cover of the frequency conversion noise reduction outlet housing
One is that fixation is covered, another is movable guard, and it is upward to be relatively fixed cover for movable guard under air outlet for kitchen ventilator airflow function
It is mobile, and by the cooperation of the elastic component on movable guard, make noise reduction hole in the working status of range hood different stalls
The noise reduction cavity of lower corresponding respective volume, according to Helmholz resonance principle, can make the resonant frequency and range hood of noise reduction cavity
The wind that produces of different stalls frequency of making an uproar it is identical or match, so as to fulfill the self-adapting frequency conversion noise reduction of outlet housing.
Brief description of the drawings
Fig. 1 is the structure diagram of the utility model embodiment
Fig. 2 is the perspective exploded view of the utility model embodiment；
Fig. 3 is structure sectional view of the utility model embodiment when range hood low-grade location is run；
Fig. 4 is the enlarged diagram of part A in Fig. 3；
Fig. 5 is structure sectional view of the utility model embodiment when range hood high tap position is run；
Fig. 6 is the structure diagram of other adoptable inner covers of the utility model embodiment；
Fig. 7 is the structure diagram of other adoptable inner covers of the utility model embodiment；
Fig. 8 is the structure diagram of other adoptable inner covers of the utility model embodiment.
Embodiment
The utility model is described in further detail below in conjunction with attached drawing embodiment.
As shown in Figures 1 to 5, the frequency conversion noise reduction outlet housing of the range hood in the present embodiment includes pedestal 1, inner cover 2, outer
Cover 3 and the grade primary clustering of outlet air mouth circle 4.
Wherein, inner cover 2 is movable guard and be in cylindrical structure, is provided with noise reduction hole 21 on the perisporium of inner cover 2, noise reduction hole 21 along
The axial direction of inner cover 2 is arranged in columns, and the noise reduction hole 21 for belonging to same row is uniformly distributed in the axially spaced-apart of inner cover 2, also, each column noise reduction
Hole 21 is uniformly distributed in the circumferentially-spaced of inner cover 2.Formed on pedestal 1 and the matched guide groove 11 of inner cover 2, the bottom of inner cover 2
Portion is plugged in guide groove 11 all the time.Connection bolt 5 is installed between the top of inner cover 2 and outlet air mouth circle 4, in connection bolt 5
On be arranged with spring 6, and the elasticity of spring 6 is supported and is located between outlet air mouth circle 4 and inner cover 2.In the present embodiment, spring 6 can use
Conventional mechanical spring, can also use gas spring, hydraulic spring grease cup etc..
Outer cover 3 is fixed cover and is in cylindrical structure, and the bottom of outer cover 3 is fixed on pedestal 1 by screw 7, the top of outer cover 3
Portion is fixed by screw 7 in outlet air mouth circle 4.Noise reduction cavity 311, axis of the noise reduction cavity along outer cover 3 are equipped with the inner wall of outer cover 3
To the noise reduction cavity group 31 for being arranged in decile, noise reduction cavity group 31 is corresponded with noise reduction hole 21.Each noise reduction cavity 31 structures of group are identical,
In the present embodiment, two noise reduction cavities 311 of each noise reduction cavity group 31 are represented with the first noise reduction cavity a and the second noise reduction cavity b, wherein,
Second noise reduction cavity b is located at below the first noise reduction cavity a, and the volume of the second noise reduction cavity b is more than the volume of the first noise reduction cavity a.Noise reduction
Chamber group 31 is also disposed adjacent in the circumferential direction of outer cover 3, and the first noise reduction cavity a in circumferentially-adjacent noise reduction cavity group 31 is located at same water
On flat round ring, the second noise reduction cavity b in circumferentially-adjacent noise reduction cavity group 31 is located on same level annulus.
In the present embodiment, the closing in portion 22 to contract, the exit flow energy of range hood are formed in 2 top port of inner cover
Closing in portion 22 is acted on upwards, so as to drive inner cover 2 to be moved up with respect to outer cover 3.
The operation principle of the frequency conversion noise reduction outlet housing is as follows：
When range hood is in low-grade location, gas flow is smaller, and effect of the air-flow to inner cover 2 is smaller, and inner cover 2 is in air-flow
With lower position is under the action of spring 6, i.e. noise reduction hole 21 corresponds to the second noise reduction cavity b；When range hood is in high tap position
When, gas flow is larger, and air-flow is larger to the active force of inner cover 2, and inner cover 2 is in high bit under the action of air-flow and spring 6
Put, i.e., noise reduction hole 21 corresponds to the first noise reduction cavity a.Thus, noise reduction hole 21 can be made in range hood by moving up and down for inner cover 2
The noise reduction cavity 311 of respective volume is corresponded under the working status of different stalls.
According to Helmholz resonance principle, the resonant frequency of each independent noise reduction cavity 311 isC is the velocity of sound,
S is corresponding 21 area of noise reduction hole, and 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 noise reduction cavity becomes larger, and resonant frequency f reduces, conversely, 311 volume of noise reduction cavity diminishes, resonant frequency f becomes
Greatly.Using Helmholz resonance noise reduction principle, the air column in noise reduction hole 21 constitutes elasticity altogether with the air in noise reduction cavity 311
Vibrating system, when the partial noise frequency of range hood is identical with the intrinsic frequency of this resonator system, the sky in noise reduction hole 21
Air column occurs resonance and severe friction occurs with hole wall, and friction makes acoustic energy be converted into thermal energy, so as to achieve the purpose that noise elimination.
Extend internally and the first air-flow kickboard 231 of circumferentially-spaced distribution as shown in fig. 6, the inner cover 2 is set in upper edge；
As shown in fig. 7, the inner cover 2, which is set in the middle part of inner wall to inner cover, extends internally the second air-flow kickboard 232；
As shown in figure 8, the inner cover 2 is set in inner wall bottom to the 3rd air-flow kickboard 233 of inner cover internal stretch.
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, these are equal
It is considered 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 (1), its feature exist
In：The cover body includes inner cover (2) and outer cover (3), and noise reduction hole (21), the noise reduction are provided with the perisporium of the inner cover (2)
Hole (21) is arranged in columns along the axial direction of inner cover (2), and noise reduction cavity (311), the noise reduction cavity are equipped with the inner wall of the outer cover (3)
Along the axial alignment of outer cover (3) into noise reduction cavity group (31), each noise reduction cavity group (31) structure is identical, each noise reduction cavity group (31)
Include at least two noise reduction cavities (311) and the volume of each noise reduction cavity (311) unidirectionally changes from top to bottom, the outer cover (3)
Covered with one of them in inner cover (2) to be fixed, another is movable guard, and being provided with movable guard makes movable guard keep oriented
The elastic component of lower movement tendency, the movable guard can be relatively fixed cover under the action of range hood exit flow and move up,
And by moving up and down for movable guard the noise reduction hole (21) can be made to correspond to phase under the working status of range hood different stalls
Answer the noise reduction cavity (311) of volume.
2. the frequency conversion noise reduction outlet housing of range hood according to claim 1, it is characterised in that：The inner cover (2) is
Movable guard, the outer cover (3) cover to be fixed, the volume of the noise reduction cavity (311) in each noise reduction cavity group (31) from top to bottom by
Gradual change is big.
3. the frequency conversion noise reduction outlet housing of range hood according to claim 2, it is characterised in that：Each noise reduction cavity group (31)
Include the first noise reduction cavity and the second noise reduction cavity below the first noise reduction cavity, and the volume of the first noise reduction cavity is less than the second drop
Make an uproar the volume of chamber.
4. the frequency conversion noise reduction outlet housing of range hood according to claim 2, it is characterised in that：Outlet air mouth circle is further included
(4), bolt (5) is connected with being provided between outlet air mouth circle (4) at the top of the inner cover (2), the elastic component is is set in
The spring (6) on connection bolt (5) is stated, and the spring (6) elasticity is supported and is located between outlet air mouth circle (4) and inner cover (2).
5. the frequency conversion noise reduction outlet housing of range hood according to claim 4, it is characterised in that：The bottom of the outer cover (3)
Portion is fixed on the pedestal (1), is fixed at the top of outer cover (3) on the outlet air mouth circle (4).
6. the frequency conversion noise reduction outlet housing of range hood according to claim 2, it is characterised in that：At the top of the inner cover (2)
Port forms the closing in portion (22) to contract.
7. the frequency conversion noise reduction outlet housing of range hood according to claim 2, it is characterised in that：The inner cover (2) it is interior
Wall is equipped with to inner cover and extends internally air-flow kickboard.
8. the frequency conversion noise reduction outlet housing of range hood according to claim 2, it is characterised in that：On the pedestal (1)
Formed and be plugged in the guide groove (11) all the time with inner cover (2) matched guide groove (11), the bottom of the inner cover (2)
It is interior.
9. the frequency conversion noise reduction outlet housing of range hood according to claim 1, it is characterised in that：Belong to the noise reduction of same row
Hole (21) is uniformly distributed in the axially spaced-apart of inner cover (2), also, each column noise reduction hole (21) is in the circumferentially-spaced uniform of inner cover (2)
Distribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721430304.7U CN207317044U (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 |
|---|---|---|---|
| CN201721430304.7U CN207317044U (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 |
|---|---|
| CN207317044U true CN207317044U (en) | 2018-05-04 |
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ID=62379303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721430304.7U Withdrawn - After Issue CN207317044U (en) | 2017-10-31 | 2017-10-31 | A kind of frequency conversion noise reduction outlet housing of range hood |
Country Status (1)
| Country | Link |
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| CN (1) | CN207317044U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240650A (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 |
-
2017
- 2017-10-31 CN CN201721430304.7U patent/CN207317044U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240650A (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 |
| CN108240650B (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 |
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Granted publication date: 20180504 Effective date of abandoning: 20240116 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180504 Effective date of abandoning: 20240116 |
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| AV01 | Patent right actively abandoned |