CN108240647B - 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
- CN108240647B CN108240647B CN201711045726.7A CN201711045726A CN108240647B CN 108240647 B CN108240647 B CN 108240647B CN 201711045726 A CN201711045726 A CN 201711045726A CN 108240647 B CN108240647 B CN 108240647B
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- cover
- inner cover
- noise reduction
- baffle
- air outlet
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- 230000009467 reduction Effects 0.000 claims abstract description 60
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000005192 partition Methods 0.000 claims description 40
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 6
- 238000010411 cooking Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 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
Abstract
The utility model provides a fan housing of making an uproar falls in frequency conversion, includes base and cover body, and the cover body includes inner cover and dustcoat, opens on the inner cover perisporium has the hole of making an uproar falls, is equipped with the first baffle of interval distribution in proper order on the outer wall of inner cover, is equipped with the second baffle of interval distribution in proper order on the inner wall of dustcoat, the mutual interval distribution of second baffle and first baffle, and adjacent first baffle, second baffle and the inner cover outer wall between this adjacent first baffle, the second baffle, dustcoat inner wall enclose jointly and make an uproar falls the chamber, and the hole of making an uproar falls and falls the chamber and correspond, installs on the base and can drive inner cover and dustcoat and carry out relative motion in order to adjust the actuating mechanism who falls the chamber size of making an uproar. The utility model has the advantages that: after the inner cover and the outer cover are driven by the driving mechanism to perform relative motion, the volume of the noise reduction cavity corresponding to the noise reduction hole can be subjected to stepless change, and the resonance frequency of the noise reduction cavity is identical to or matched with the wind noise frequency generated by different gears of the range hood, so that effective noise reduction 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 is disclosed, where the air outlet cover 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 local or integral mesh structure. 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, stepless adjustment of the noise reduction frequency cannot be carried out, 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-reducing air outlet cover of the range hood, which can steplessly adjust the resonance frequency of the noise-reducing 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, first partition plates which are sequentially distributed at intervals are arranged on the outer wall of the inner cover, second partition plates which are sequentially distributed at intervals are arranged on the inner wall of the outer cover, the second partition plates and the first partition plates are mutually distributed at intervals, the outer wall of the inner cover and the inner wall of the outer cover between the adjacent first partition plates and the adjacent second partition plates are jointly enclosed to form a noise reduction cavity, the noise reduction holes correspond to the noise reduction cavity, and a driving mechanism capable of driving the inner cover and the outer cover to perform relative motion so as to adjust the size of the noise reduction cavity is arranged on the base.
Preferably, the bottom of the inner cover is fixed on the base, and the outer cover moves circumferentially relative to the inner cover under the drive of the driving mechanism.
Further preferably, the noise reduction holes are arranged in a row along an axial direction of the inner cover, and the noise reduction holes in each row are distributed at intervals along a circumferential direction of the inner cover, correspondingly, a length direction of the first partition plates is consistent with the axial direction of the inner cover, all the first partition plates are distributed at intervals along the circumferential direction of the inner cover, a length direction of the second partition plates is consistent with the axial direction of the outer cover, and all the second partition plates are distributed at intervals along the circumferential direction of the outer cover.
Further preferably, the first separator and the second separator are both flat plates and parallel to each other.
In order to obtain better noise reduction effect, noise reduction holes in each row are uniformly distributed at circumferential intervals of the inner cover, correspondingly, the first partition plates are uniformly distributed at circumferential intervals of the inner cover, and the second partition plates are uniformly distributed at circumferential intervals of the outer cover.
In order to obtain better noise reduction effect, noise reduction holes belonging to the same row are uniformly distributed along the axial interval of the inner cover.
Further preferably, the air outlet cover further comprises an air outlet ring, the top of the inner cover is fixed on the air outlet ring, an upper chute for embedding the top of the outer cover is formed at the bottom of the air outlet ring, and a lower chute for embedding the bottom of the outer cover is formed on the base. After adopting above-mentioned structure, can make the mounting structure of inner cover more firm, the dustcoat rotates more steadily after going up spout and lower spout.
The driving mechanism can have various structures, preferably, the driving mechanism comprises an electric push rod arranged on the base, the lower part of the outer wall of the outer cover is provided with an outwardly extending rocker, and the rocker is connected to the electric push rod. Therefore, the electric push rod can drive the rocker to rotate when working, so that the outer cover is driven to rotate relative to the inner cover.
As another preferable mode, the inner cover is fixed on the base, and the outer cover moves axially relative to the inner cover under the drive of the driving mechanism.
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: the variable-frequency noise-reducing air outlet cover of the range hood forms a noise-reducing cavity between the first partition plate of the inner cover and the second partition plate of the outer cover, noise-reducing holes in the inner cover are in one-to-one correspondence with the noise-reducing cavities, the inner cover and the outer cover are driven to perform relative motion through the driving mechanism, the size of the noise-reducing cavity corresponding to the noise-reducing holes can be subjected to stepless change, and the resonance frequency of the noise-reducing cavity is identical to or matched with the wind noise frequency generated by different gears of the range hood, so that effective noise reduction 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 cross-sectional view of an embodiment of the present utility model;
fig. 4 is a schematic structural view of the embodiment of the present utility model when the range hood is operated in a low gear position;
FIG. 5 is an enlarged schematic view of portion A of FIG. 4;
fig. 6 is a schematic view of a gear operation in a range hood according to an embodiment of the present utility model;
FIG. 7 is an enlarged schematic view of portion B of FIG. 6;
fig. 8 is a schematic structural view of the embodiment of the present utility model when the range hood is operated in a high gear position;
fig. 9 is an enlarged schematic view of a portion C in fig. 8.
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 9, 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, a driving mechanism 5, and the like. Wherein, the inner cover 2 and the outer cover 3 are both in cylindrical structures, the inner cover 2 is a fixing piece, the bottom of the inner cover 2 is fixed on the base 1, and the top of the inner cover 2 is fixed on the air outlet ring 4 through a screw 7; the outer cover 3 is a movable piece, a lower chute is formed on the base 1, an upper chute is formed at the bottom of the air outlet ring 4, the bottom of the outer cover 3 is embedded in the lower chute, and the top of the outer cover 3 is embedded in the upper chute. In this embodiment, the driving mechanism 5 includes an electric push rod 51 mounted on the base 1, and the lower portion of the outer wall of the housing 3 has an outwardly extending rocker 32, and the rocker 32 is connected to the electric push rod 51. The electric push rod 51 can drive the rocker 32 to rotate, so as to drive the outer cover 3 to move circumferentially relative to the inner cover 2.
In this embodiment, 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, and the noise reduction holes 21 belonging to the same row are uniformly distributed along the axial direction of the inner cover 2 at intervals. And the noise reduction holes of each row are uniformly distributed along the circumferential direction of the inner cover 2 at intervals. The outer wall of the inner cover 2 is provided with first partition plates 22, the length direction of each first partition plate 22 is consistent with the axial direction of the inner cover 2, all the first partition plates 22 are uniformly distributed along the circumferential direction of the inner cover 2 at intervals, and each first partition plate 22 is provided with a row of noise reduction holes 21.
The inner wall of the outer cover 3 is provided with second partition plates 31 which are sequentially distributed at intervals, the length direction of the second partition plates 31 is consistent with the axial direction of the outer cover 3, and all the second partition plates 31 are uniformly distributed along the circumferential direction of the outer cover 3 at intervals. The second partition plate 31 and the first partition plate 22 are flat plates parallel to each other and are spaced apart, and the noise reduction chamber 6 is defined by the adjacent first partition plate 22 and second partition plate 31, and the outer wall of the inner cover 2 and the inner wall of the outer cover 3 between the adjacent first partition plate and second partition plate. Each row of noise reduction holes 21 corresponds to one noise reduction cavity 6.
According to Helmholtz resonancePrinciple, the resonance frequency of each independent noise reduction cavity 6 isc is sound velocity, S is total area of each row of noise reduction holes 21, V is noise reduction cavity volume, and L is effective neck length of the noise reduction holes 21. It follows that the volume of the noise reduction chamber 6 becomes larger and the resonance frequency f becomes smaller, whereas the volume of the noise reduction chamber 6 becomes smaller and the resonance frequency f becomes larger, with other parameters unchanged. 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 6, and 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.
The working principle of the noise reduction air outlet cover is as follows:
in operation, the outer cover 3 is driven to rotate relative to the inner cover 2 by the electric push rod 51, so that the distance between the first partition plate 22 and the second partition plate 31 is changed, the volume of the noise reduction cavity 6 is changed, and the resonance frequency is changed.
As shown in fig. 4 and 5, the volume of the noise reduction chamber 6 is the largest, and at this time, the state corresponds to the low gear operation state of the range hood; as shown in fig. 6 and 7, after the outer cover 3 rotates clockwise, the volume of the noise reduction cavity 6 becomes smaller, and at this time, the state corresponds to the middle gear operation state of the range hood; as shown in fig. 8 and 9, the housing 3 is further rotated clockwise, and the volume of the noise reduction chamber 6 is further reduced, at this time, corresponding to a state of high-range operation of the range hood. In addition, in the clockwise rotation process of the outer cover 3, the volume of the noise reduction cavity 6 is changed steplessly, so that the stepless frequency conversion noise reduction of the air outlet cover can be realized by rotating the outer cover 3.
While the utility model has been described with respect to the preferred embodiments, it should be noted that various modifications and improvements may be made to the present utility model by those skilled in the art without departing from the principles of the utility model, for example, the inner cover may be fixed to the base, the partition plate on the inner cover and the partition plate on the outer cover may be radial partition plates, the outer cover may be driven by the driving mechanism to move axially with respect to the inner cover, and stepless frequency conversion and noise reduction of the air outlet cover may be achieved, which are considered to be within the scope of the present utility model.
Claims (6)
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 the base, 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), first partition plates (22) which are sequentially distributed at intervals are arranged on the outer wall of the inner cover (2), second partition plates (31) which are sequentially distributed at intervals are arranged on the inner wall of the outer cover (3), the second partition plates (31) and the first partition plates (22) are mutually distributed at intervals, the adjacent first partition plates (22), the second partition plates (31) and the inner cover (2) between the adjacent first partition plates and the second partition plates, the outer wall of the inner cover (2) and the inner wall of the outer cover (3) jointly encircle a noise reduction cavity (6), the noise reduction holes (21) correspond to the noise reduction cavity (6), a driving mechanism (5) which can drive the inner cover (2) and the outer cover (3) to move relatively so as to adjust the size of the noise reduction cavity (6) is arranged on the base (1), the outer cover (3) moves along the axial direction of the inner cover (2) along the corresponding axial direction of the inner cover (2) along the axial direction of the inner cover (21), all first baffle (22) are along the circumference interval distribution of inner cover (2), and the length direction of second baffle (31) is unanimous with the axial of dustcoat (3), and all second baffle (31) are along the circumference interval distribution of dustcoat (3), first baffle (22) are dull and stereotyped and each other parallel with second baffle (31), and every hole of making an uproar (21) falls in the circumference interval evenly distributed of inner cover (2), correspondingly, the circumference interval evenly distributed of inner cover (2) is put in first baffle (22), the circumference interval evenly distributed of dustcoat (3) is put in second baffle (31).
2. The variable frequency noise reduction air outlet cover of the range hood according to claim 1, wherein: noise reduction holes (21) belonging to the same column are uniformly distributed along the axial direction of the inner cover (2).
3. The variable frequency noise reduction air outlet cover of the range hood according to claim 1, wherein: the novel air conditioner is characterized by further comprising an air outlet ring (4), wherein the top of the inner cover (2) is fixed on the air outlet ring (4), an upper chute for embedding the top of the outer cover (3) is formed at the bottom of the air outlet ring (4), and a lower chute for embedding the bottom of the outer cover (3) is formed on the base (1).
4. The variable frequency noise reduction air outlet cover of the range hood according to claim 3, wherein: the driving mechanism (5) comprises an electric push rod (51) arranged on the base (1), a rocker (32) extending outwards is arranged at the lower part of the outer wall of the outer cover (3), and the rocker (32) is connected to the electric push rod (51).
5. The variable frequency noise reduction air outlet cover of the range hood according to claim 1, wherein: the inner cover (2) is fixed on the base (1), and the outer cover (3) moves axially relative to the inner cover (2) under the drive of the driving mechanism (5).
6. The variable frequency noise reduction exhaust hood of a range hood according to any one of claims 1 to 5, wherein: the inner cover (2) and the outer cover (3) are both cylindrical structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711045726.7A CN108240647B (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 |
|---|---|---|---|
| CN201711045726.7A CN108240647B (en) | 2017-10-31 | 2017-10-31 | Variable-frequency noise-reduction air outlet cover of range hood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108240647A CN108240647A (en) | 2018-07-03 |
| CN108240647B true CN108240647B (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711045726.7A Active CN108240647B (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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111336558B (en) * | 2020-03-05 | 2022-03-18 | 宁波方太厨具有限公司 | Air outlet hood, range hood applying air outlet hood and control method of range hood |
| 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 |
| 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 |
| CN112944419B (en) * | 2021-03-18 | 2022-05-17 | 宁波方太厨具有限公司 | Range hood and vibration reduction control method thereof |
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| SU877093A2 (en) * | 1980-02-15 | 1981-10-30 | Предприятие П/Я М-5703 | Noise silenser |
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Also Published As
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| CN108240647A (en) | 2018-07-03 |
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