CN114483644A - Centrifugal impeller, centrifugal fan and range hood - Google Patents
Centrifugal impeller, centrifugal fan and range hood Download PDFInfo
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- CN114483644A CN114483644A CN202011266772.1A CN202011266772A CN114483644A CN 114483644 A CN114483644 A CN 114483644A CN 202011266772 A CN202011266772 A CN 202011266772A CN 114483644 A CN114483644 A CN 114483644A
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- centrifugal
- noise reduction
- micropores
- blade
- micropore
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- 230000009467 reduction Effects 0.000 claims abstract description 127
- 239000011148 porous material Substances 0.000 claims description 13
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000003517 fume Substances 0.000 abstract description 22
- 239000000243 solution Substances 0.000 description 9
- 239000000779 smoke Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010411 cooking Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
- F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- 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 invention discloses a centrifugal impeller, a centrifugal fan and oil fume suction equipment, wherein the centrifugal impeller comprises: a plurality of centrifugal blades are arranged in an annular shape, at least one centrifugal blade is provided with a noise reduction structure, the noise reduction structure comprises a noise reduction cavity arranged in the corresponding centrifugal blade and a plurality of micropore areas arranged on the corresponding centrifugal blade, each micropore area is provided with a plurality of noise reduction micropores communicated with the noise reduction cavity, and the perforation rates of at least two micropore areas are different. The technical scheme of the invention can reduce the operation noise of the oil fume suction equipment.
Description
Technical Field
The invention relates to the technical field of kitchen appliances, in particular to a centrifugal impeller, a centrifugal fan and oil fume suction equipment.
Background
For the oil fume suction device, the oil fume suction device is generally provided with an oil fume suction duct, a fume exhaust fan is arranged in the oil fume suction duct, a fume inlet of the oil fume suction duct is communicated with an indoor space, and a fume outlet is communicated with an outdoor space so as to exhaust oil fume generated by cooking in a kitchen outdoors. Generally, a centrifugal fan is adopted as the smoke exhaust fan, however, the gas flow in the centrifugal fan is complex, pneumatic noise is easily generated, and the frequency band of the noise is wide.
Disclosure of Invention
The invention mainly aims to provide a centrifugal impeller, aiming at reducing the operation noise of a range hood device.
In order to achieve the above object, the present invention provides a centrifugal impeller comprising:
a plurality of centrifugal blades are arranged in an annular shape, at least one centrifugal blade is provided with a noise reduction structure, the noise reduction structure comprises a noise reduction cavity arranged in the corresponding centrifugal blade and a plurality of micropore areas arranged on the corresponding centrifugal blade, each micropore area is provided with a plurality of noise reduction micropores communicated with the noise reduction cavity, and the perforation rates of at least two micropore areas are different.
In the technical scheme of the invention, the micropore areas with different perforation rates are combined with the part of the noise reduction cavity corresponding to each micropore area to reduce noise corresponding to different frequency bands, namely, the noise reduction frequency bands of at least two micropore areas are different, so that after the centrifugal fan with the centrifugal impeller is installed in the oil fume suction air duct of the oil fume suction equipment, in the operation process of the oil fume suction equipment, pneumatic noise generated in the centrifugal volute is reduced through the noise reduction structure, and noise of different frequency bands in pneumatic noise can be reduced through the micropore areas with different noise reduction frequency bands, thereby realizing wide-frequency-band noise reduction and further reducing the operation noise of the oil fume suction equipment.
Optionally, each centrifugal blade is provided with the noise reduction structure, so that each centrifugal blade has a noise reduction function, and the noise reduction performance of the centrifugal impeller is improved.
Optionally, on the same centrifugal impeller, the perforation rates of the multiple micropore areas are different, so that noise reduction of multiple frequency bands as much as possible is realized, and the noise reduction frequency band width of the centrifugal impeller is improved.
Optionally, the micro-porous regions are provided on the leeward side of the corresponding centrifugal blade to avoid the problem of additional noise caused by the high speed of the airflow passing through the noise-reducing micro-pores.
Optionally, on the same centrifugal blade, the noise reduction cavities corresponding to any two adjacent micropore areas are communicated, so that the processing is easy, and the batch preparation of products is facilitated.
Optionally, on the corresponding centrifugal blade, a plurality of micro-porous areas are fully distributed on the leeward surface, so as to make full use of the leeward surface 126 to absorb and reduce noise at more positions, thereby more effectively reducing the operation noise of the range hood.
Optionally, the plurality of microporous regions are sequentially arranged in the length direction of the corresponding centrifugal blade, so as to facilitate separation to realize different microporous regions.
Optionally, the plurality of noise reduction micropores in each micropore area are arranged in an array, so that the plurality of cooling micropores in the micropore area are regularly arranged, and a large-batch and consistent product is produced.
Optionally, in the length direction of the corresponding centrifugal blade, each micropore area comprises a plurality of rows of noise reduction micropores, and the intervals between the noise reduction micropores in adjacent rows in different micropore areas are the same, so that the complexity of the noise reduction micropore group on the centrifugal blade is reduced, and the processing convenience of the centrifugal blade is improved.
Optionally, the perforation rates of different micropore areas are gradually reduced from the middle position of the centrifugal blade to the two ends of the centrifugal blade corresponding to the centrifugal blade; therefore, the noise reduction frequency band corresponding to the micropore areas at the two ends of the centrifugal blade is lower, and the centrifugal blade can be better suitable for reducing noise at a lower frequency at the air inlet of the centrifugal impeller, so that the noise reduction performance of the centrifugal impeller is improved.
Optionally, the centrifugal impeller further comprises a mounting plate, and the mounting plate is used for being connected with a rotating part of the motor;
the edge part of the mounting disc is connected with the centrifugal blades, and the noise reduction micropores are avoided corresponding to the connection part of the centrifugal blades and the mounting disc, so that the noise reduction micropores are complete in structure, and the corresponding noise reduction function of the noise reduction micropores is not damaged.
Optionally, the joint between the corresponding centrifugal blade and the mounting plate is located between two adjacent micropore areas, so that the two adjacent micropore areas can both ensure the integrity of respective areas, and the noise reduction frequency bands corresponding to the two micropore areas are prevented from being affected.
Optionally, the depth of the noise reduction cavity is 3mm, and the aperture of the noise reduction micropore is 0.6 mm;
the micropore areas are arranged on the leeward side of the corresponding centrifugal blade, and the micropore areas comprise a first micropore area, a second micropore area, a third micropore area and a fourth micropore area which are sequentially arranged in the length direction of the corresponding centrifugal blade;
in the length direction of the corresponding centrifugal blade, each micropore area comprises a plurality of rows of noise reduction micropores, and the distance between every two adjacent rows of noise reduction micropores on each micropore area is 4.85 mm;
in the width direction of the corresponding centrifugal blade, the distance between the adjacent noise reduction micropores in the first micropore area is 8mm, the distance between the adjacent noise reduction micropores in the second micropore area is 3mm, the distance between the adjacent noise reduction micropores in the third micropore area is 2.2mm, and the distance between the adjacent noise reduction micropores in the fourth micropore area is 4.8 mm.
Therefore, the pneumatic noise with the main frequency (700Hz-1250Hz) generated by the range hood device can be effectively absorbed, and the effectiveness of the noise reduction effect is improved.
The invention also provides a centrifugal fan, which comprises
A centrifugal volute; and
the centrifugal impeller is arranged in the centrifugal volute.
The invention also provides a range hood device which comprises the centrifugal fan.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural view of an embodiment of the range hood device of the present invention;
figure 2 is a schematic cross-sectional view of the range hood device of figure 1;
fig. 3 is a schematic structural view of a centrifugal fan of the range hood device of fig. 1;
FIG. 4 is a schematic structural view of a centrifugal impeller of the centrifugal fan of FIG. 3;
FIG. 5 is a schematic partial cross-sectional structural view of a centrifugal impeller blade of the centrifugal impeller of FIG. 4;
FIG. 6 is a schematic structural view of the centrifugal blade of FIG. 5;
fig. 7 is a graph of sound absorption coefficient for a centrifugal impeller of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
11 | |
| 12 | |
121 | |
| 122 | |
123 | |
| 124 | Micro-poresRegion(s) | 125 | |
| 126 | Leeward |
127 | |
| 124a | A first |
124b | Second |
| 124c | Third |
124d | A fourth |
| 2 | Cigarette machine |
21 | Exhaust |
| 22 | Fan cover |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" and/or "appears throughout, the meaning includes three parallel schemes, for example," A and/or B "includes scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention proposes a centrifugal impeller, which is generally applied to centrifugal fans. The centrifugal fan is generally applied to a range hood. The fume suction device can be a range hood only with the fume suction function, and also can be an integrated cooker with the fume suction function and other functions, and the other functions can be the functions of disinfecting the kitchen ware (integrated with a disinfection cabinet), cooking (integrated with a cooker, a microwave oven and the like), cleaning the kitchen ware (integrated with a dishwasher) and the like.
Referring to fig. 1 and 6, in one embodiment of the present invention, the centrifugal impeller 12 includes:
the centrifugal blades 121 are arranged in a ring shape, at least one centrifugal blade 121 is provided with a noise reduction structure 122, the noise reduction structure 122 comprises a noise reduction cavity 123 arranged in the corresponding centrifugal blade 121 and a plurality of micropore areas 124 arranged on the corresponding centrifugal blade 121, each micropore area 124 is provided with a plurality of noise reduction micropores 125 communicated with the noise reduction cavity 123, and the perforation rates of at least two micropore areas 124 are different.
It can be understood that the micro-porous areas 124 with different perforation rates can reduce noise corresponding to different frequency bands by combining with the corresponding partial noise reduction cavities, that is, at least two noise reduction frequency bands of the micro-porous areas 124 are different, so that, after the centrifugal fan 1 with the centrifugal impeller 12 is installed in the range hood duct of the range hood device, in the operation process of the range hood device, the pneumatic noise generated in the centrifugal volute 11 can be reduced by the noise reduction structure 122, and the noise of different frequency bands in the pneumatic noise can be reduced by the micro-porous areas 124 with different noise reduction frequency bands, thereby realizing the noise reduction in the wide frequency band, and further reducing the operation noise of the range hood device.
Further, referring to fig. 4, each centrifugal blade 121 is provided with the noise reduction structure 122, so that each centrifugal blade 121 has a noise reduction function, the number of the noise reduction structures 122 is increased, and the noise reduction performance of the centrifugal impeller 12 is improved. However, the design is not limited thereto, and in other embodiments, some centrifugal blades may not be provided with the noise reduction structure 122, and only some centrifugal blades 121 are provided with the noise reduction structure 122, so that the centrifugal impeller 12 may also have a function of reducing noise in a wide frequency band. Of course, in order to ensure the rotational stability of the centrifugal impeller 12, for the technical solution that the noise reduction structures 122 are only disposed on part of the centrifugal blades 121, the part of the centrifugal blades 121 on which the noise reduction structures 122 are disposed may be uniformly distributed in the part of the centrifugal blades on which the noise reduction structures 122 are not disposed, for example, the centrifugal blades 121 on which the noise reduction structures 122 are disposed and the centrifugal blades on which the noise reduction structures 122 are not disposed are arranged at intervals one by one.
Further, referring to fig. 6, on the same centrifugal blade 121, the perforation rates of the plurality of micro-hole regions 124 are different, so that on the same centrifugal blade 121, the noise reduction frequency bands corresponding to the micro-hole regions 124 are different, thereby reducing noise in multiple frequency bands as much as possible, and further increasing the noise reduction frequency band width of the centrifugal impeller 12. Of course, in other embodiments, the perforation rates of some of the microporous regions 124 may be the same on the same centrifugal blade 121, so that the noise reduction frequency band of some of the microporous regions 124 is the same for the same centrifugal blade 121, for example, when the noise amount of noise in a certain frequency band is much larger than that of noise in other frequency bands, the perforation rates of two or more of the microporous regions 124 may be set to be the same.
Further, the micro-porous area 124 is disposed on the leeward side 126 of the corresponding centrifugal blade 121. It will be appreciated that the centrifugal blades 121 are generally cambered with a leeward side 126 being a convex cambered surface and a windward side being a concave cambered surface; during the rotation of the centrifugal impeller 12, in the rotation direction, the windward side is located at the front side of the leeward side 126, and the windward side receives a larger wind pressure; if the micropore area is arranged on the windward side, the windward pressure on the windward side is large under the high-speed rotation of the centrifugal impeller 12, and the airflow may pass through the noise reduction micropores 125 at a high speed, which may cause additional noise problems. In this embodiment, the micro-porous area 124 is disposed on the leeward side 126, which not only can effectively absorb and reduce the noise of the eddy current noise on the leeward side 126, but also can avoid the problem of extra noise generated by the airflow passing through the noise reduction micro-pores 125 at high speed.
Optionally, on the same centrifugal blade 121, the noise reduction cavities of the portions corresponding to any two adjacent micro-pore regions 124 are communicated with each other, so that, for the same centrifugal blade 121, only one integral noise reduction cavity needs to be formed, and compared with the technical scheme that the noise reduction cavities of the portions corresponding to different micro-pore regions 124 need to be separated, the centrifugal blade 121 in the technical scheme is easier to process and is beneficial to batch preparation of products. However, the design is not limited thereto, and in other embodiments, a partition plate may be disposed in the noise reduction cavity 123 to separate the noise reduction cavities corresponding to the adjacent micro-hole regions 124.
Optionally, referring to fig. 6, on the corresponding centrifugal blade 121, a plurality of micro-porous areas 124 are fully distributed on the leeward side 126, so as to fully utilize the leeward side 126 to absorb and reduce noise at more positions, thereby more effectively reducing the operation noise of the range hood.
Optionally, the cavity wall of the noise reduction cavity 123 is of a thin-wall structure, so that the noise reduction cavity 123 is as large as possible, and the noise reduction performance of the product is improved. Further optionally, the centrifugal blades 121 are made of sheet metal sheets by stamping, bending and enclosing to form the noise reduction cavity 123 inside; accordingly, the noise reduction holes 125 are punched holes; the metal plate stamping process is a mature processing process, and is beneficial to batch manufacturing of products; however, the design is not limited thereto, and in other embodiments, the noise reduction cavity 123 may be formed by, but not limited to, an injection core-pulling process.
Alternatively, referring to fig. 6, the plurality of micro-porous regions 124 are sequentially arranged in a length direction of the corresponding centrifugal blade 121. Without loss of generality, the centrifugal blades 121 are generally arranged in a strip shape, i.e., their length is generally much greater than their width; in this embodiment, the plurality of micro-pore regions 124 are arranged along the length direction of the corresponding centrifugal blade 121, which is beneficial to separating different micro-pore regions 124. However, the design is not limited thereto, and in other embodiments, when the width of the centrifugal blade 121 is also large, especially when the difference between the width and the length of the centrifugal blade 121 is not large, the plurality of micro-hole regions 124 may also be sequentially arranged in the width direction of the centrifugal blade 121.
In this embodiment, optionally, the plurality of noise reduction micropores 125 in each micropore area 124 are arranged in an array, so that the plurality of cooling micropores 125 in each micropore area 124 are regularly arranged, thereby facilitating production of uniform products in batches. Alternatively, the noise reduction micro holes 125 may be, but not limited to, circular holes, polygonal holes, or irregular holes.
In this embodiment, optionally, in the length direction of the corresponding centrifugal blade 121, each micro-hole region 124 includes a plurality of rows of noise reduction micro-holes 125, and the intervals between adjacent rows of noise reduction micro-holes 125 on different micro-hole regions 124 are the same, that is, the intervals between any two adjacent rows of noise reduction micro-holes 125 on the whole centrifugal blade 121 are the same, so for the micro-hole regions 124 with different perforation rates, only the interval between two adjacent noise reduction micro-holes 125 on the same row of noise reduction micro-holes 125 on the same region needs to be changed, and the design of the micro-hole regions 124 with different perforation rates can be simplified; in addition, the adjacent rows of noise reduction micro holes 125 in different micro hole areas 124 have the same interval, and the complexity of the whole noise reduction micro hole group on the centrifugal blade 121 can be reduced, so that the processing convenience of the centrifugal blade 121 is improved.
Further, in correspondence to the centrifugal blade 121, the perforation rates of the different micro-porous areas 124 are gradually decreased from the central position of the centrifugal blade 121 toward both ends thereof. It can be understood that the smaller puncturing rate is the lower noise reduction frequency band corresponding to the empty region 124; for the centrifugal impeller 12, air is axially supplied and radially discharged, that is, the air inlets of the centrifugal impeller 12 are located at two opposite axial ends of the centrifugal impeller 12, and the air inlets of the centrifugal impeller 12 generally generate low-frequency noise, so that the perforation rate of the micro-hole regions 124 on the centrifugal impeller 121 near the two ends is set to be smaller, which is better suitable for reducing noise of low-frequency noise at the air inlets of the centrifugal impeller 12, thereby improving the noise reduction performance of the centrifugal impeller 12.
Referring to fig. 4, further, the centrifugal impeller 12 further includes a mounting plate 127, the mounting plate 127 is used to connect with a rotating portion of the motor;
the edge part of the mounting disc 127 is connected with the centrifugal blades 121, and the noise reduction micropores 125 are avoided corresponding to the connection part of the centrifugal blades 121 and the mounting disc 127.
It will be appreciated that when the motor rotates, the mounting plate 127 is driven to rotate, so as to drive the centrifugal blades 121 to rotate, and finally the aerodynamic noise is reduced by the noise reduction structure 122. In this embodiment, the installation disk 127 can provide installation attachment for the centrifugal blades 121, so as to reduce the falling probability of the centrifugal blades 121; at the same time, the arrangement of the mounting plate 127 is also beneficial to ensure the stability of the centrifugal impeller 12 during rotation. Furthermore, in this embodiment, the connecting portion between the centrifugal blade 121 and the mounting plate 127 avoids the noise reduction micro-hole 125, so that the noise reduction micro-hole 125 has a complete structure, and the corresponding noise reduction function of the noise reduction micro-hole 125 is not damaged.
In this embodiment, optionally, the joint of the corresponding centrifugal blade 121 and the mounting disk 127 is located between two adjacent micro-hole regions 124, so that the two adjacent micro-hole regions 124 can both ensure the respective regions to be complete, so as to avoid the respective noise reduction frequency band from being affected.
In the present embodiment, specifically, the depth of the noise reduction cavity 123 is 3mm, and the aperture of the noise reduction micropore 125 is 0.6 mm;
the micro-pore area 124 is arranged on the leeward surface 126 of the corresponding centrifugal blade 121, and the plurality of micro-pore areas 124 comprise a first micro-pore area 124a, a second micro-pore area 124b, a third micro-pore area 124c and a fourth micro-pore area 124d which are sequentially arranged in the length direction of the corresponding centrifugal blade 121;
in the length direction of the corresponding centrifugal blade 121, each micropore area 124 comprises a plurality of rows of noise reduction micropores 125, and the distance between every two adjacent rows of noise reduction micropores 125 on each micropore area 124 is 4.85 mm;
in the width direction of the corresponding centrifugal blade 121, the distance between the adjacent noise reduction micro holes 125 in the first micro hole region 124a is 8mm, the distance between the adjacent noise reduction micro holes 125 in the second micro hole region 124b is 3mm, the distance between the adjacent noise reduction micro holes 125 in the third micro hole region 124c is 2.2mm, and the distance between the adjacent noise reduction micro holes 125 in the fourth micro hole region 124d is 4.8 mm.
Thus, the noise reduction frequency bands corresponding to the four micropore areas 124 (the first to fourth micropore areas) can be 700Hz-800Hz, 950Hz-1150Hz, 1150Hz-1250Hz, and 800Hz-950Hz in sequence. According to the acoustic analogy circuit, the four micro-hole regions 124 belong to a parallel structure, and the sound absorption effect is the superposition of four sections of sound absorption effects, so that the centrifugal impeller 12 provided by the embodiment can absorb the pneumatic noise in the frequency range of 700Hz to 1350Hz, and the frequency band of 700Hz to 1250Hz is the main frequency of the pneumatic noise generated by the oil fume suction device, so that the centrifugal fan 1 with the centrifugal impeller 12 can effectively reduce the pneumatic noise of the oil fume suction device.
Specifically, referring to fig. 7, it can be seen that the sound absorption coefficient of the centrifugal impeller 12 provided in this embodiment can reach above 0.4 within a range of 700Hz to 1250Hz, and the centrifugal impeller 12 can effectively reduce the overall noise reduction level of the range hood device.
It should be noted that the specific parameters related to the centrifugal impeller 12 are not exclusive, for example, when the aperture of the noise reduction micropores 125 is not 0.6mm, if the micropore areas 122 are to reduce noise in the same frequency band, the perforation rate of the micropore area 124 (the distance between the noise reduction micropores 125 in the micropore area 124 in the length direction and/or the width direction of the centrifugal blade 121) and the cavity depth of the noise reduction cavity 123 may be changed.
Referring to fig. 3, the present invention further provides a centrifugal fan 1, where the centrifugal fan 1 includes a centrifugal volute 11 and a centrifugal impeller 12 disposed in the centrifugal volute 11, and the specific structure of the centrifugal impeller 12 refers to the above embodiments, and since the centrifugal fan 1 adopts all technical solutions of all the above embodiments, the centrifugal fan at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated here.
Referring to fig. 1 and fig. 2, the present invention further provides a range hood device, which includes a centrifugal fan 1, and the specific structure of the centrifugal fan 1 refers to the above embodiments, and since the range hood device adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not described in detail herein. Referring to fig. 1, the range hood apparatus is specifically a range hood, and further includes a range hood main body 2, a range hood air duct is provided in the range hood main body 2, a smoke inlet of the range hood air duct communicates with an indoor space, a smoke outlet is used for communicating with an outdoor space, and a centrifugal fan 1 is provided in the range hood air duct and is generally disposed near the smoke outlet. The smoke exhaust machine main body 2 generally comprises a smoke collecting hood 21 and a fan cover 22 arranged above the smoke collecting hood 21, and the centrifugal fan 1 is generally arranged in the fan cover 22.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (15)
1. A centrifugal impeller, comprising:
a plurality of centrifugal blades are arranged in an annular shape, at least one centrifugal blade is provided with a noise reduction structure, the noise reduction structure comprises a noise reduction cavity arranged in the corresponding centrifugal blade and a plurality of micropore areas arranged on the corresponding centrifugal blade, each micropore area is provided with a plurality of noise reduction micropores communicated with the noise reduction cavity, and the perforation rates of at least two micropore areas are different.
2. The centrifugal impeller according to claim 1, wherein each centrifugal blade is provided with said noise reducing structure.
3. The centrifugal impeller of claim 1, wherein the plurality of microporous regions vary in perforation rate over the same centrifugal impeller.
4. The centrifugal impeller of claim 1, wherein the micro-porous regions are disposed on a leeward side of the corresponding centrifugal blade.
5. The centrifugal impeller according to claim 4, wherein on the same centrifugal impeller, the noise reduction cavities corresponding to any two adjacent micro-hole regions are communicated with each other.
6. The centrifugal impeller of claim 4, wherein a plurality of micro-porous regions fill the leeward surface on the respective centrifugal impeller.
7. The centrifugal impeller of claim 1, wherein the plurality of micro-porous regions are arranged in sequence in a direction corresponding to a length of the centrifugal blade.
8. The centrifugal impeller of claim 1, wherein the plurality of noise-reducing micropores within each micropore area are arranged in an array.
9. The centrifugal impeller of claim 8 wherein each region of micropores includes a plurality of rows of noise reducing micropores in the lengthwise direction of the corresponding centrifugal blade, the spacing between adjacent rows of noise reducing micropores being the same in different regions of micropores.
10. The centrifugal impeller according to claim 1, wherein the perforation rates of the different micro-porous areas are gradually decreased in the direction from the central position of the centrifugal blade toward both ends thereof with respect to the centrifugal blade.
11. The centrifugal impeller of claim 1 further comprising a mounting plate for connection to a rotating portion of a motor;
the edge part of the mounting disc is connected with the centrifugal blades, and the noise reduction micropores are avoided corresponding to the connection part of the centrifugal blades and the mounting disc.
12. The centrifugal impeller of claim 11, wherein the junction of a corresponding centrifugal vane with the mounting disk is located between two adjacent micro-perforated regions.
13. The centrifugal impeller according to claim 1, wherein the noise reduction cavity has a depth of 3mm, and the noise reduction micropores have a pore size of 0.6 mm;
the micropore areas are arranged on the leeward side of the corresponding centrifugal blade, and the micropore areas comprise a first micropore area, a second micropore area, a third micropore area and a fourth micropore area which are sequentially arranged in the length direction of the corresponding centrifugal blade;
in the length direction of the corresponding centrifugal blade, each micropore area comprises a plurality of rows of noise reduction micropores, and the distance between every two adjacent rows of noise reduction micropores on each micropore area is 4.85 mm;
in the width direction of the corresponding centrifugal blade, the distance between the adjacent noise reduction micropores in the first micropore area is 8mm, the distance between the adjacent noise reduction micropores in the second micropore area is 3mm, the distance between the adjacent noise reduction micropores in the third micropore area is 2.2mm, and the distance between the adjacent noise reduction micropores in the fourth micropore area is 4.8 mm.
14. A centrifugal fan, comprising:
a centrifugal volute; and
a centrifugal impeller according to any one of claims 1 to 13, disposed within the centrifugal volute.
15. A range hood device comprising a centrifugal fan according to claim 14.
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| CN202011266772.1A CN114483644B (en) | 2020-11-12 | 2020-11-12 | Centrifugal impeller, centrifugal fan and fume absorbing equipment |
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