CN108240650B - Variable-frequency noise-reduction air outlet cover of range hood - Google Patents
Variable-frequency noise-reduction air outlet cover of range hood Download PDFInfo
- Publication number
- CN108240650B CN108240650B CN201711047888.4A CN201711047888A CN108240650B CN 108240650 B CN108240650 B CN 108240650B CN 201711047888 A CN201711047888 A CN 201711047888A CN 108240650 B CN108240650 B CN 108240650B
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- cover
- noise reduction
- air outlet
- range hood
- uproar
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- 230000009467 reduction Effects 0.000 claims abstract description 106
- 230000000694 effects Effects 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract 2
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000010411 cooking Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ventilation (AREA)
Abstract
The utility model provides a fan housing of making an uproar falls in frequency conversion, which comprises a base, inner cover and dustcoat, it has the hole of making an uproar to open on the inner cover perisporium, it is listed as to fall the hole of making an uproar along the axial of inner cover, be equipped with the chamber of making an uproar along the axial of dustcoat on the dustcoat inner wall, it makes an uproar to fall the chamber along the axial of dustcoat and arrange into the chamber group of making an uproar, every chamber group of making an uproar is the same in the chamber group of making an uproar, every chamber group of making an uproar that makes an uproar falls includes at least two and each chamber of making an uproar's volume top-down unidirectional variation that makes an uproar, one of dustcoat and inner cover is the fixed cover, another is the movable cover, install the elastic component that makes the movable cover keep the downward movement trend on the movable cover, the movable cover can be relative fixed cover upward movement under the effect of range hood export air current. The variable-frequency noise-reduction air outlet cover can move upwards relative to the fixed cover under the action of air flow at the air outlet of the range hood, and the noise reduction holes correspond to the noise reduction cavities with corresponding volumes under the working states of different gears of the range hood through the cooperation of the elastic parts, so that the self-adaptive variable-frequency noise reduction of the air outlet cover is realized.
Description
Technical Field
The utility model relates to an air outlet cover of a range hood, in particular to a variable-frequency noise-reduction air outlet cover of the range hood.
Background
Chinese cooking can generate a large amount of oil smoke, and in order to keep the kitchen environment clean and the health of human bodies, the range hood has become one of the indispensable devices of modern family kitchens. The fume exhaust fan sucks gas in an air inlet of the fume exhaust fan in the operation process, and the gas is exhausted through an air outlet of the blower. The existing range hood is generally provided with an air outlet cover at the air outlet of the fan, and the air outlet cover has the functions of collecting air, guiding flow and connecting the range hood with an air outlet pipe. The air flow generated by the fan is finally converged into the air outlet cover, so that the air flow in the air outlet cover is too concentrated, and turbulence is generated by the movement of the air flow in the cover body to generate noise, thereby affecting the cooking experience and the health of people.
In order to reduce noise generated when air flows through the air outlet cover, the structure of the air outlet cover is improved. The air outlet cover comprises a cover body, wherein the cover body is provided with an air outlet and an air inlet connected with an air outlet port of a volute, the peripheral wall of the cover body is a smooth surface, and a volute tongue extends upwards from the air inlet. The volute tongue is designed on the peripheral wall of the cover body, so that the volute air outlet port connected with the air outlet cover is free from additionally designing the volute tongue, the structure is simplified, the active noise reduction function of the air outlet cover is realized by utilizing the volute tongue, and the air outlet cover is noise-reduced through the volute tongue, so that the noise reduction effect is general. As another example, in the disclosure of chinese patent No. 201620102678.5 (issued to the public No. CN 205536022U), an air outlet cover for a range hood includes a cover bottom and a cover head, the cover bottom is an air inlet end, the cover head is an air outlet end, and a plurality of through holes are formed in a peripheral wall of the cover head so that the cover head is in a mesh structure locally or wholly. Although the air outlet cover achieves the noise reduction effect by injecting and mixing surrounding air when the fan discharges air, the noise reduction effect achieved by injecting and mixing is poor. In addition, the gear change of the range hood can change the wind noise frequency, the existing noise reduction measures cannot be correspondingly adjusted according to the gear change of the fan, the self-adaptive adjustment cannot be carried out according to the different gear of the fan, the noise reduction effect is not intelligent enough, and the user experience is poor. In view of the above, there is a need for further improvement of the existing air outlet cover structure.
Disclosure of Invention
The utility model aims to solve the technical problem of providing the variable-frequency noise-reduction air outlet cover of the range hood, which can adaptively adjust the resonance frequency of the noise-reduction cavity according to the gear of a fan.
The technical scheme adopted for solving the technical problems is as follows: the variable-frequency noise-reduction air outlet cover of the range hood comprises a base and a cover body arranged on the base, and is characterized in that: the cover body comprises an inner cover and an outer cover, noise reduction holes are formed in the peripheral wall of the inner cover, the noise reduction holes are arranged in a row along the axial direction of the inner cover, noise reduction cavities are arranged on the inner wall of the outer cover and form noise reduction cavity groups along the axial direction of the outer cover, each noise reduction cavity group has the same structure, each noise reduction cavity group comprises at least two noise reduction cavities, the volumes of the noise reduction cavities change unidirectionally from top to bottom, one of the outer cover and the inner cover is a fixed cover, the other one is a movable cover, an elastic piece which enables the movable cover to keep a downward movement trend is arranged on the movable cover, the movable cover can move upwards relative to the fixed cover under the action of outlet airflow of the range hood, and the noise reduction cavities can correspond to noise reduction cavities with corresponding volumes under the working states of different gears of the range hood through up-down movement of the movable cover.
As a preferable scheme, the inner cover is a movable cover, the outer cover is a fixed cover, and the volume of the noise reduction cavity in each noise reduction cavity group gradually increases from top to bottom.
In order to match the range hood with high and low gears, each noise reduction cavity group comprises a first noise reduction cavity and a second noise reduction cavity positioned below the first noise reduction cavity, and the volume of the first noise reduction cavity is smaller than that of the second noise reduction cavity. When the range hood is in a high gear, the noise reduction hole corresponds to a first noise reduction cavity with smaller volume, and when the range hood is in a low gear, the noise reduction hole corresponds to a second noise reduction cavity with larger volume.
The elastic piece can have various mounting structures, and preferably, the air outlet cover further comprises an air outlet ring, a connecting bolt is mounted between the top of the inner cover and the air outlet ring, the elastic piece is a spring sleeved on the connecting bolt, and the spring is elastically propped between the air outlet ring and the inner cover.
The outer cover can have various mounting and fixing structures, preferably, the bottom of the outer cover is fixed on the base, and the top of the outer cover is fixed on the air outlet ring.
In order to enable the inner cover to float upwards under the action of air flow at the outlet of the fan of the range hood, the inner wall of the inner cover is provided with an air flow floating plate extending towards the inner part of the inner cover.
Further preferably, the inner housing top port forms an inwardly converging spout. Thus, after the air flow from the outlet of the fan acts on the receiving part, the inner cover can be floated upwards.
Further preferably, the air flow floating plates are uniformly distributed along the inner wall of the inner cover at intervals, so that the acting force of the inner cover on the air flow is more uniform.
In order to enable the inner cover to move up and down more stably, a guide groove matched with the inner cover is formed on the base, and the bottom of the inner cover is always inserted into the guide groove.
In order to obtain better noise reduction effect, noise reduction holes belonging to the same row are uniformly distributed at axial intervals of the inner cover, and noise reduction holes in each row are uniformly distributed at circumferential intervals of the inner cover.
Preferably, in any of the above aspects, the inner cover and the outer cover are both cylindrical structures.
Compared with the prior art, the utility model has the advantages that: one of the inner cover and the outer cover of the variable-frequency noise-reduction air outlet cover is a fixed cover, the other is a movable cover, the movable cover can move upwards relative to the fixed cover under the action of air flow at the air outlet of the range hood, and the noise reduction holes correspond to noise reduction cavities with corresponding volumes under the working states of different gears of the range hood through the cooperation of elastic pieces arranged on the movable cover, so that the resonance frequency of the noise reduction cavities is identical to or matched with the wind noise frequency generated by different gears of the range hood according to the Helmholtz resonance principle, and the self-adaptive variable-frequency noise reduction of the range hood is realized.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present utility model
FIG. 2 is an exploded perspective view of an embodiment of the present utility model;
fig. 3 is a sectional view illustrating a structure of the embodiment of the present utility model when the range hood is operated in a low gear position;
FIG. 4 is an enlarged schematic view of portion A of FIG. 3;
fig. 5 is a sectional view illustrating a structure of the embodiment of the present utility model when the range hood is operated in a high gear position;
FIG. 6 is a schematic view of another inner cover that may be used in an embodiment of the present utility model;
FIG. 7 is a schematic view of another inner cover that may be used in an embodiment of the present utility model;
fig. 8 is a schematic structural view of another inner cover that may be used in the embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1 to 5, the variable frequency noise reduction air outlet cover of the range hood in the present embodiment includes main components such as a base 1, an inner cover 2, an outer cover 3, an air outlet ring 4, and the like.
The inner cover 2 is a movable cover and is in a cylindrical structure, noise reduction holes 21 are formed in the peripheral wall of the inner cover 2, the noise reduction holes 21 are arranged in rows along the axial direction of the inner cover 2, the noise reduction holes 21 belonging to the same row are uniformly distributed at the axial interval of the inner cover 2, and the noise reduction holes 21 in each row are uniformly distributed at the circumferential interval of the inner cover 2. A guide groove 11 is formed in the base 1 to be fitted with the inner cover 2, and the bottom of the inner cover 2 is always inserted into the guide groove 11. A connecting bolt 5 is arranged between the top of the inner cover 2 and the air outlet ring 4, a spring 6 is sleeved on the connecting bolt 5, and the spring 6 is elastically propped between the air outlet ring 4 and the inner cover 2. In this embodiment, the spring 6 may be a conventional mechanical spring, a gas spring, a hydraulic spring, or the like.
The outer cover 3 is a fixed cover and is of a cylindrical structure, the bottom of the outer cover 3 is fixed on the base 1 through a screw 7, and the top of the outer cover 3 is fixed on the air outlet ring 4 through the screw 7. Noise reduction cavities 311 are arranged on the inner wall of the outer cover 3, the noise reduction cavities are arranged into noise reduction cavity groups 31 which are equally divided along the axial direction of the outer cover 3, and the noise reduction cavity groups 31 are in one-to-one correspondence with the noise reduction holes 21. In this embodiment, two noise reduction cavities 311 of each noise reduction cavity group 31 are represented by a first noise reduction cavity a and a second noise reduction cavity b, where the second noise reduction cavity b is located below the first noise reduction cavity a, and the volume of the second noise reduction cavity b is greater than that of the first noise reduction cavity a. The noise reduction cavity groups 31 are also adjacently arranged in the circumferential direction of the outer cover 3, and the first noise reduction cavities a in the circumferentially adjacent noise reduction cavity groups 31 are positioned on the same horizontal ring, and the second noise reduction cavities b in the circumferentially adjacent noise reduction cavity groups 31 are positioned on the same horizontal ring.
In this embodiment, an inwardly contracted closing portion 22 is formed at the top end of the inner cover 2, and the outlet air flow of the range hood can act upward on the closing portion 22, so as to drive the inner cover 2 to move upward relative to the outer cover 3.
The working principle of the variable-frequency noise-reduction air outlet cover is as follows:
when the range hood is in a low gear, the gas flow is smaller, the effect of the gas flow on the inner cover 2 is smaller, and the inner cover 2 is in a lower position under the effect of the gas flow and the spring 6, namely the noise reduction hole 21 corresponds to the second noise reduction cavity b; when the range hood is in a high gear, the air flow is large, the acting force of the air flow on the inner cover 2 is large, and the inner cover 2 is in a high position under the action of the air flow and the spring 6, namely, the noise reduction hole 21 corresponds to the first noise reduction cavity a. Therefore, the noise reduction holes 21 can correspond to the noise reduction cavities 311 with corresponding volumes in the working states of different gears of the range hood through the up-and-down movement of the inner cover 2.
According to the Helmholtz resonance principle, each independent noise reduction cavity 311 has a resonance frequency ofc is sound velocity, S is the area of the corresponding noise reduction hole 21, V is the volume of the noise reduction cavity, and L is the effective neck length of the noise reduction hole 21. It can be seen that the volume of the noise reduction cavity 311 is increased and the resonance frequency f is decreased while the other parameters are unchanged, whereas the volume of the noise reduction cavity 311 is decreased and the resonance frequency f is increased. By utilizing the Helmholtz resonance silencing principle, an elastic resonance system is formed by the air column in the noise reduction hole 21 and the air in the noise reduction cavity 311, when the partial noise frequency of the range hood is the same as the natural frequency of the resonance system, the air column in the noise reduction hole 21 resonates and rubs with the hole wall severely, and the acoustic energy is converted into heat energy by friction, so that the purpose of silencing is achieved.
As shown in fig. 6, the inner cover 2 is provided with first air floating plates 231 extending inwards and circumferentially spaced apart at the upper edge;
as shown in fig. 7, the inner cover 2 is provided with a second air flow floating plate 232 extending toward the inside of the inner cover at the middle of the inner wall;
as shown in fig. 8, the inner cover 2 is provided with a third air floating plate 233 extending toward the inside of the inner cover at the bottom of the inner wall.
The foregoing is merely illustrative of the preferred embodiments of this utility model, and it will be appreciated by those skilled in the art that variations and modifications of this utility model can be made without departing from the principles of the utility model, and these are considered to be within the scope of the utility model.
Claims (10)
1. The utility model provides a range hood's frequency conversion air-out cover of making an uproar that falls, includes base (1) and locates the cover body on base (1), its characterized in that: the cover body comprises an inner cover (2) and an outer cover (3), noise reduction holes (21) are formed in the peripheral wall of the inner cover (2), the noise reduction holes (21) are arranged in a row along the axial direction of the inner cover (2), noise reduction cavities (311) are formed in the inner wall of the outer cover (3), the noise reduction cavities are arranged into noise reduction cavity groups (31) along the axial direction of the outer cover (3), each noise reduction cavity group (31) has the same structure, each noise reduction cavity group (31) comprises at least two noise reduction cavities (311) and the volume of each noise reduction cavity (311) is unidirectionally changed from top to bottom, one of the outer cover (3) and the inner cover (2) is a fixed cover, the other is a movable cover, an elastic piece which enables the movable cover to keep a downward movement trend is arranged on the movable cover, the movable cover can move upwards relative to the fixed cover under the effect of outlet airflow of the range hood, and the noise reduction cavities (311) which correspond to the corresponding volumes of the noise reduction cavities (21) under the working states of different gear positions of the range hood are arranged through the movable cover.
2. The variable frequency noise reduction air outlet cover of the range hood according to claim 1, wherein: the inner cover (2) is a movable cover, the outer cover (3) is a fixed cover, and the volume of the noise reduction cavity (311) in each noise reduction cavity group (31) is gradually increased from top to bottom.
3. The variable frequency noise reduction air outlet cover of the range hood according to claim 2, wherein: each noise reduction cavity group (31) comprises a first noise reduction cavity and a second noise reduction cavity positioned below the first noise reduction cavity, and the volume of the first noise reduction cavity is smaller than that of the second noise reduction cavity.
4. The variable frequency noise reduction air outlet cover of the range hood according to claim 2, wherein: the air outlet ring (4) is arranged between the top of the inner cover (2) and the air outlet ring (4), the elastic piece is a spring (6) sleeved on the connecting bolt (5), and the spring (6) is elastically propped between the air outlet ring (4) and the inner cover (2).
5. The variable frequency noise reduction air outlet cover of the range hood according to claim 4, wherein: the bottom of the outer cover (3) is fixed on the base (1), and the top of the outer cover (3) is fixed on the air outlet ring (4).
6. The variable frequency noise reduction air outlet cover of the range hood according to claim 2, wherein: the top port of the inner cover (2) forms an inwardly contracted closing-in part (22).
7. The variable frequency noise reduction air outlet cover of the range hood according to claim 2, wherein: the inner wall of the inner cover (2) is provided with an air flow floating plate extending towards the inner part of the inner cover.
8. The variable frequency noise reduction air outlet cover of the range hood according to claim 2, wherein: a guide groove (11) matched with the inner cover (2) is formed on the base (1), and the bottom of the inner cover (2) is always inserted into the guide groove (11).
9. The variable frequency noise reduction air outlet cover of the range hood according to claim 1, wherein: the noise reduction holes (21) belonging to the same column are uniformly distributed at axial intervals of the inner cover (2), and the noise reduction holes (21) of each column are uniformly distributed at circumferential intervals of the inner cover (2).
10. The variable frequency noise reduction exhaust hood of a range hood according to any one of claims 1 to 9, wherein: the inner cover (2) and the outer cover (3) are both cylindrical structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711047888.4A CN108240650B (en) | 2017-10-31 | 2017-10-31 | Variable-frequency noise-reduction air outlet cover of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711047888.4A CN108240650B (en) | 2017-10-31 | 2017-10-31 | Variable-frequency noise-reduction air outlet cover of range hood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108240650A CN108240650A (en) | 2018-07-03 |
| CN108240650B true CN108240650B (en) | 2024-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711047888.4A Active CN108240650B (en) | 2017-10-31 | 2017-10-31 | Variable-frequency noise-reduction air outlet cover of range hood |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206761A (en) * | 2018-10-19 | 2019-09-06 | 华帝股份有限公司 | Composite broadband silencer for range hood and range hood |
| CN114076336B (en) * | 2020-08-20 | 2023-07-04 | 佛山市顺德区美的洗涤电器制造有限公司 | Air outlet cover and fume absorbing equipment |
| CN114076335B (en) * | 2020-08-20 | 2023-06-30 | 佛山市顺德区美的洗涤电器制造有限公司 | Fume exhaust device |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201463047U (en) * | 2009-05-18 | 2010-05-12 | 浙江德意厨具有限公司 | Air duct of range hood |
| KR20110052935A (en) * | 2009-11-13 | 2011-05-19 | 주식회사 하츠 | Noise reduction range hood |
| JP2012184916A (en) * | 2012-04-16 | 2012-09-27 | Fuji Industrial Co Ltd | Range hood |
| CN105509119A (en) * | 2016-02-18 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Noise reduction device and extractor hood |
| CN205191681U (en) * | 2015-11-02 | 2016-04-27 | 广东万和电气有限公司 | Range hood |
| CN105546608A (en) * | 2016-02-01 | 2016-05-04 | 宁波方太厨具有限公司 | Outlet housing for range hood |
| CN205402834U (en) * | 2016-02-18 | 2016-07-27 | 广东美的厨房电器制造有限公司 | Make an uproar device and range hood fall |
| CN205536022U (en) * | 2016-02-01 | 2016-08-31 | 宁波方太厨具有限公司 | Air -out cover for cooker hood |
| CN106050751A (en) * | 2016-07-22 | 2016-10-26 | 宁波方太厨具有限公司 | Silencer of range hood |
| CN106568109A (en) * | 2016-11-11 | 2017-04-19 | 宁波方太厨具有限公司 | Noise reducing impeller and range hood applying impeller |
| CN206176503U (en) * | 2016-11-11 | 2017-05-17 | 宁波方太厨具有限公司 | Range hood that makes an uproar falls |
| CN206207518U (en) * | 2016-11-11 | 2017-05-31 | 宁波方太厨具有限公司 | A kind of noise reduction impeller and application have the range hood of the impeller |
| CN206592345U (en) * | 2017-03-15 | 2017-10-27 | 宁波方太厨具有限公司 | A kind of auxiliary denoising device of cooking-fume exhauster blower system |
| CN207317044U (en) * | 2017-10-31 | 2018-05-04 | 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 CN201711047888.4A patent/CN108240650B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201463047U (en) * | 2009-05-18 | 2010-05-12 | 浙江德意厨具有限公司 | Air duct of range hood |
| KR20110052935A (en) * | 2009-11-13 | 2011-05-19 | 주식회사 하츠 | Noise reduction range hood |
| JP2012184916A (en) * | 2012-04-16 | 2012-09-27 | Fuji Industrial Co Ltd | Range hood |
| CN205191681U (en) * | 2015-11-02 | 2016-04-27 | 广东万和电气有限公司 | Range hood |
| CN205536022U (en) * | 2016-02-01 | 2016-08-31 | 宁波方太厨具有限公司 | Air -out cover for cooker hood |
| CN105546608A (en) * | 2016-02-01 | 2016-05-04 | 宁波方太厨具有限公司 | Outlet housing for range hood |
| CN205402834U (en) * | 2016-02-18 | 2016-07-27 | 广东美的厨房电器制造有限公司 | Make an uproar device and range hood fall |
| CN105509119A (en) * | 2016-02-18 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Noise reduction device and extractor hood |
| CN106050751A (en) * | 2016-07-22 | 2016-10-26 | 宁波方太厨具有限公司 | Silencer of range hood |
| CN106568109A (en) * | 2016-11-11 | 2017-04-19 | 宁波方太厨具有限公司 | Noise reducing impeller and range hood applying impeller |
| CN206176503U (en) * | 2016-11-11 | 2017-05-17 | 宁波方太厨具有限公司 | Range hood that makes an uproar falls |
| CN206207518U (en) * | 2016-11-11 | 2017-05-31 | 宁波方太厨具有限公司 | A kind of noise reduction impeller and application have the range hood of the impeller |
| CN206592345U (en) * | 2017-03-15 | 2017-10-27 | 宁波方太厨具有限公司 | A kind of auxiliary denoising device of cooking-fume exhauster blower system |
| CN207317044U (en) * | 2017-10-31 | 2018-05-04 | 宁波方太厨具有限公司 | A kind of frequency conversion noise reduction outlet housing of range hood |
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| Publication number | Publication date |
|---|---|
| CN108240650A (en) | 2018-07-03 |
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