CN108240648B - 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
- CN108240648B CN108240648B CN201711045974.1A CN201711045974A CN108240648B CN 108240648 B CN108240648 B CN 108240648B CN 201711045974 A CN201711045974 A CN 201711045974A CN 108240648 B CN108240648 B CN 108240648B
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- noise reduction
- air outlet
- range hood
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- 230000009467 reduction Effects 0.000 claims abstract description 62
- 238000000926 separation method Methods 0.000 claims abstract description 29
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract 2
- 230000007246 mechanism Effects 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000010411 cooking Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 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
- 230000000149 penetrating effect Effects 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)
- Air-Flow Control Members (AREA)
- Ventilation (AREA)
Abstract
The utility model provides a range hood's frequency conversion noise reduction goes out fan housing, which comprises a base, inner cover and dustcoat, it has the hole of making an uproar to open on the inner cover perisporium, be equipped with along circumference setting and upper and lower interval distribution's first baffle that separates on the inner cover outer wall, be equipped with upper and lower interval distribution's second baffle on the dustcoat inner wall, second baffle and first baffle interval distribution each other, form the cavity of making an uproar that falls that corresponds with the hole of making an uproar between adjacent first baffle and the second baffle, one of dustcoat and inner cover is fixed cover, another is the movable cover, install the elastic component that makes the movable cover keep having the downward motion trend on the movable cover, the movable cover can reciprocate in order to adjust the interval between first baffle and the second baffle under range hood export air current and elastic component's effect. The noise-reduction air outlet cover can move up and down in cooperation with the air flow of the air outlet and the elastic piece to adjust the distance between the first separation gear and the second separation gear, so that the self-adaptive stepless variable frequency noise reduction of the air 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 stepless adjustment cannot be further carried out according to the gear difference 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-reducing air outlet cover of the range hood, which can adaptively and steplessly adjust the resonance frequency of a 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 separation baffles which are arranged along the circumferential direction and distributed vertically at intervals are arranged on the outer wall of the inner cover, second separation baffles which are arranged along the circumferential direction and distributed vertically at intervals are arranged on the inner wall of the outer cover, the second separation baffles and the first separation baffles are distributed vertically at intervals, the adjacent first separation baffles, the second separation baffles, the inner cover outer wall between the adjacent first separation baffles and the adjacent second separation baffles and the outer cover inner wall enclose a noise reduction cavity together, the noise reduction holes correspond to the noise reduction cavity, one of the outer cover and the inner cover is a fixed cover, the other is a movable cover, an elastic piece which enables the movable cover to keep downward movement trend is arranged on the movable cover, and the movable cover can move upwards relative to the fixed cover under the action of outlet airflow of the range hood and can move vertically under the action of the outlet airflow and the elastic piece so as to adjust the distance between the first separation baffles and the second separation baffles.
As a preferable scheme, the inner cover is a fixed cover, and the outer cover is a movable cover. Of course, the inner cover may be a movable cover, and the outer cover may be a fixed cover.
Preferably, the air outlet cover further comprises an air outlet ring, the bottom of the inner cover is fixed on the base, the top of the inner cover is fixed on the air outlet ring, a guide seat is arranged on the outer side wall of the outer cover, a guide rod which is vertically arranged is movably arranged on the guide seat in a penetrating mode, the guide rod is supported between the air outlet ring and the base, the elastic piece is a spring sleeved on the guide rod, and the spring is elastically propped against and arranged between the air outlet ring and the upper end face of the guide seat.
In order to facilitate installation, the outer cover comprises a first cover shell and a second cover shell which are spliced and butted, and the guide seats are arranged on the outer side walls of the first cover shell and the second cover shell. And moreover, the guide seats are arranged on the first housing and the second housing, so that the up-and-down movement of the housing is smoother.
In order to enable the outer cover to move upwards under the action of the outlet air flow of the range hood, a floating mechanism is arranged at the top of the outer cover, and the outlet air flow of the range hood drives the outer cover to move upwards through the floating mechanism.
The floating mechanism can have various structures, and preferably comprises a connecting rod and an air floating plate, wherein the connecting rod spans the top of the inner cover, two ends of the connecting rod are fixed on the outer cover, and the air floating plate is arranged in the middle of the connecting rod.
In order to make the outlet air flow act on the air floating plate more uniformly, the air floating plate is horizontally arranged, and the vertical projection of the air floating plate falls into the central area of the inner cover.
In order to obtain better noise reduction effect, the first baffle and the second baffle are both arranged horizontally.
In order to obtain better noise reduction effect, the noise reduction holes are arranged in a row along the axial direction of the inner cover, noise reduction holes belonging to the same row are uniformly distributed at the axial interval of the inner cover, noise reduction holes in each row are uniformly distributed at the circumferential interval of the inner cover, and correspondingly, the first baffle and the second baffle are uniformly distributed at intervals.
Preferably, in any of the above aspects, the inner cover and the outer cover have a uniform cylindrical structure.
Compared with the prior art, the utility model has the advantages that: one of the inner cover and the outer cover of the self-adaptive variable-frequency noise-reducing 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 of an air outlet of the range hood, and the space between a first separation gear and a second separation gear can be adjusted by means of the cooperation of an elastic piece arranged on the movable cover, so that noise reduction holes correspond to noise reduction cavities of corresponding volumes in working states of different gears of the range hood, the volumes of the noise reduction cavities can be subjected to stepless adjustment, and according to the Helmholtz resonance principle, 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, thereby realizing self-adaptive stepless variable-frequency noise reduction of the air cover.
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 side view of an embodiment of the present utility model;
fig. 4 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. 5 is an enlarged schematic view of portion A of FIG. 4;
fig. 6 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. 7 is an enlarged schematic view of the portion B in fig. 6.
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 3, 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, and an air outlet ring 4.
Wherein, the inner cover 2 is a fixed cover, 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. The inner cover 2 is of 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 a row along the axial direction of the inner cover 2, the noise reduction holes 21 belonging to the same row are uniformly distributed at axial intervals of the inner cover 2, and the noise reduction holes 21 in each row are uniformly distributed at circumferential intervals of the inner cover 2. The outer wall of the inner cover 2 is provided with first baffles 22 which are arranged along the circumferential direction and are evenly distributed at intervals up and down, and the first baffles 22 are horizontally arranged.
The outer cover 3 is of a cylindrical structure, and second separation baffles 31 are arranged on the inner wall of the outer cover 3 along the circumferential direction, and the second separation baffles 31 are horizontally distributed and uniformly distributed at intervals up and down. The second baffle 31 and the first baffle 22 are vertically spaced from each other, and the adjacent first baffle 22 and second baffle 31 and the outer wall of the inner cover 2 and the inner wall of the outer cover 3 between the adjacent first baffle and second baffle are jointly enclosed to form the noise reduction cavity 5. The noise reduction holes 31 on the inner cover 2 correspond to the noise reduction cavities 5, and the noise reduction holes 21 of the same row correspond to the same noise reduction cavity 5.
The outer cover 3 is a movable cover, and the outer cover 3 can move up and down relative to the inner cover 2. The guide seat 6 is arranged on the outer side wall of the outer cover 3, the guide seat 6 is movably penetrated with the guide rod 7 which is vertically arranged, the guide rod 7 is supported between the air outlet ring 4 and the base 1, the guide rod 7 is sleeved with the spring 8, and the spring 8 is elastically propped between the air outlet ring 4 and the upper end face of the guide seat 6, so that the outer cover 3 keeps a downward movement trend. The spring 8 may be a conventional mechanical spring, or may be other springs such as a gas spring and a micro-pressure spring. In this embodiment, for easy installation, the housing 3 includes a first casing 3a and a second casing 3b that are joined together, and guide holders 6 are mounted on the outer side walls of the first casing 3a and the second casing 3 b.
In addition, a floating mechanism 9 is arranged at the top of the outer cover 3, and the outlet airflow of the range hood drives the outer cover 3 to move upwards through the floating mechanism 3. In this embodiment, the floating mechanism 9 includes a link 91 and an air floating plate 92, the link 91 straddles the top of the inner cover 2, both ends of the link 91 are fixed to the outer cover 3, and the air floating plate 92 is mounted in the middle of the link 91. In order to make the force of the air bearing plate 92 more uniform, the air bearing plate 92 is horizontally arranged, and the vertical projection of the air bearing plate 92 falls into the central region of the inner cover.
The working principle of the adaptive stepless variable-frequency noise-reduction air outlet cover is as follows:
the acting force of the spring 8 to the outer cover 3 is downward, the acting force of the outlet airflow to the outer cover 3 is upward, the outer cover 3 can move up and down under the action of the outlet airflow and the spring 8 to adjust the distance between the first baffle 22 and the second baffle 31, and then the size of the noise reduction cavity 5 is changed, so that the noise reduction hole 21 corresponds to the noise reduction cavity 5 with corresponding size under the working state of different gears of the range hood.
As shown in fig. 4 and 5, when the range hood is in the low gear, the gas flow is smaller, the acting force of the outlet airflow on the outer cover 3 is smaller, the outer cover 3 is in the lower position under the action of the outlet airflow and the spring 8, at this time, the distance between the first baffle 22 and the second baffle 31 is larger, and the volume of the noise reduction cavity 5 corresponding to the noise reduction hole 21 is larger.
As shown in fig. 6 and 7, when the range hood is in the high gear, the gas flow is larger, the acting force of the outlet airflow on the outer cover 3 is larger, the outer cover 3 is in a higher position under the action of the outlet airflow and the spring 8, at this time, the distance between the first baffle 22 and the second baffle 31 is larger, and the volume of the noise reduction cavity 5 corresponding to the noise reduction hole 21 is larger.
According to the helmholtz resonance principle,the resonance frequency of each independent noise reduction cavity 5 isc 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 chamber 5 is increased and the resonance frequency f is decreased while the other parameters are unchanged, whereas the volume of the noise reduction chamber 5 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 5, 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 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 (8)
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), first separation baffles (22) which are arranged along the circumferential direction and distributed at intervals up and down are arranged on the outer wall of the inner cover (2), second separation baffles (31) which are arranged along the circumferential direction and distributed at intervals up and down are arranged on the inner wall of the outer cover (3), the second separation baffles (31) and the first separation baffles (22) are distributed at intervals up and down, adjacent first separation baffles (22), second separation baffles (31) and the inner cover (2) outer wall between the adjacent first separation baffles and the adjacent second separation baffles, the inner wall of the outer cover (3) are jointly surrounded to form a noise reduction cavity (5), the noise reduction holes (21) correspond to the noise reduction cavity (5), one of the outer cover (3) and the inner cover (2) is a fixed cover, the other is a movable cover, an elastic part which enables the movable cover to keep downward movement, the movable cover can move under the action of an air flow outlet of the movable cover and the movable cover (2), the movable cover can move relatively to the first separation baffles (22) and the second separation baffles (31), and the movable cover can be adjusted to move relatively under the fixed separation baffles (31).
2. The variable frequency noise reduction air outlet cover of the range hood according to claim 1, wherein: still including air outlet ring (4), the bottom of inner cover (2) is fixed on base (1), and the top of inner cover (2) is fixed on air outlet ring (4) be equipped with guide holder (6) on the lateral wall of dustcoat (3) guide bar (7) of vertical setting are worn to be equipped with to the activity on guide holder (6), guide bar (7) support between air outlet ring (4) and base (1), the elastic component for the cover establish spring (8) on the guide bar, spring (8) elasticity support is established between the up end of air outlet ring (4) and guide holder (6).
3. The variable frequency noise reduction air outlet cover of the range hood according to claim 2, wherein: the outer cover (3) comprises a first cover shell (3 a) and a second cover shell (3 b) which are spliced and butted, and the guide seats (6) are respectively arranged on the outer side walls of the first cover shell (3 a) and the second cover shell (3 b).
4. The variable frequency noise reduction air outlet cover of the range hood according to claim 1, wherein: a floating mechanism (9) is arranged at the top of the outer cover (3), and the outlet airflow of the range hood drives the outer cover (3) to move upwards through the floating mechanism (9).
5. The variable frequency noise reduction air outlet cover of the range hood according to claim 4, wherein: the floating mechanism (9) comprises a connecting rod (91) and an air floating plate (92), the connecting rod (91) spans the top of the inner cover (2), two ends of the connecting rod (91) are fixed on the outer cover (3), and the air floating plate (92) is arranged in the middle of the connecting rod (91).
6. The variable frequency noise reduction air outlet cover of the range hood according to claim 5, wherein: the air floating plate (92) is horizontally arranged, and the vertical projection of the air floating plate (92) falls into the central area of the inner cover (2).
7. The variable frequency noise reduction air outlet cover of the range hood according to claim 1, wherein: the noise reduction holes (21) are arranged in a row along the axial direction of the inner cover (2), the noise reduction holes (21) belonging to the same row are uniformly distributed at axial intervals of the inner cover (2), the noise reduction holes (21) in each row are uniformly distributed at circumferential intervals of the inner cover (2), and correspondingly, the first separation baffles (22) and the second separation baffles (31) are uniformly distributed at intervals.
8. The variable frequency noise reduction exhaust hood of a range hood according to any one of claims 1 to 7, wherein: the inner cover (2) and the outer cover (3) have uniform cylinder structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711045974.1A CN108240648B (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 |
|---|---|---|---|
| CN201711045974.1A CN108240648B (en) | 2017-10-31 | 2017-10-31 | Variable-frequency noise-reduction air outlet cover of range hood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108240648A CN108240648A (en) | 2018-07-03 |
| CN108240648B true CN108240648B (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711045974.1A Active CN108240648B (en) | 2017-10-31 | 2017-10-31 | Variable-frequency noise-reduction air outlet cover of range hood |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7699051B2 (en) * | 2005-06-08 | 2010-04-20 | Westen Industries, Inc. | Range hood |
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2017
- 2017-10-31 CN CN201711045974.1A patent/CN108240648B/en active Active
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| CN102042628A (en) * | 2011-01-10 | 2011-05-04 | 宁波方太厨具有限公司 | Range hood with flow-stabilizing and noise-reducing structure |
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| CN206330187U (en) * | 2016-12-29 | 2017-07-14 | 宁波方太厨具有限公司 | A kind of single air-inlet range hood |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108240648A (en) | 2018-07-03 |
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