CN114483644B - Centrifugal impeller, centrifugal fan and fume absorbing equipment - Google Patents
Centrifugal impeller, centrifugal fan and fume absorbing equipment Download PDFInfo
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- CN114483644B CN114483644B CN202011266772.1A CN202011266772A CN114483644B CN 114483644 B CN114483644 B CN 114483644B CN 202011266772 A CN202011266772 A CN 202011266772A CN 114483644 B CN114483644 B CN 114483644B
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- centrifugal
- noise reduction
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- 239000003517 fume Substances 0.000 title abstract description 33
- 230000035515 penetration Effects 0.000 claims abstract description 3
- 238000009434 installation Methods 0.000 claims description 5
- 239000000243 solution Substances 0.000 description 10
- 239000000779 smoke Substances 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000010411 cooking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 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
- 238000000605 extraction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a centrifugal impeller, a centrifugal fan and fume absorbing equipment, wherein the centrifugal impeller comprises: the centrifugal blades are arranged in a ring 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 at least two micropore areas are different in penetration rate. The technical scheme of the invention can reduce the operation noise of the fume exhaust equipment.
Description
Technical Field
The invention relates to the technical field of kitchen appliances, in particular to a centrifugal impeller, a centrifugal fan and fume absorbing equipment.
Background
For the oil fume sucking device, the oil fume sucking device is generally provided with an oil fume sucking air duct, a fume exhausting fan is arranged in the oil fume sucking air duct, a fume inlet of the oil fume sucking air duct is communicated with an indoor space, and a fume exhausting port is communicated with an outdoor space so as to exhaust fume generated by cooking in a kitchen to the outside. Usually, a centrifugal fan is adopted as the smoke exhaust fan, however, the gas flow in the centrifugal fan is complex, the pneumatic noise is easy to generate, and the frequency band of the noise is wider.
Disclosure of Invention
The invention mainly aims to provide a centrifugal impeller which aims at reducing the operation noise of fume sucking equipment.
In order to achieve the above object, the present invention provides a centrifugal impeller comprising:
the centrifugal blades are arranged in a ring 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 at least two micropore areas are different in penetration rate.
According to the technical scheme, noise in different frequency ranges can be reduced by combining the micropore areas with different perforation rates and the corresponding partial noise reduction cavities, namely, noise reduction frequency ranges of at least two micropore areas are different, so that when the centrifugal fan with the centrifugal impeller is installed in the fume suction duct of the fume suction equipment, in the running process of the fume suction equipment, pneumatic noise generated in the centrifugal volute can be reduced through the noise reduction structure, noise in different frequency ranges in the pneumatic noise can be reduced through the micropore areas with different noise reduction frequency ranges, and the wide-frequency-range noise reduction is realized, so that the running noise of the fume suction equipment is reduced.
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 blade, the perforation rates of the microporous regions are different from each other, so that noise in multiple frequency bands is reduced, and the noise reduction frequency band width of the centrifugal impeller is improved.
Optionally, the micropore area is arranged on the lee surface of the corresponding centrifugal blade, so that the problem of extra noise generated when the airflow passes through the noise reduction micropores at high speed is avoided.
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, the leeward surface is fully distributed on the corresponding centrifugal blade in a plurality of micropore areas so as to fully utilize the leeward surface 126 to absorb and reduce noise at more positions, thereby reducing the operation noise of the fume exhaust device more effectively.
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 arranged regularly, and the batch and consistent products can be produced.
Optionally, each micropore area includes a plurality of rows of noise reduction micropores in a length direction of the corresponding centrifugal blade, and intervals between adjacent rows of noise reduction micropores on different micropore areas are the same, so that overall complexity of noise reduction micropore groups on the centrifugal blade is reduced, and processing convenience of the centrifugal blade is improved.
Optionally, the perforation rate of different micropore areas is gradually reduced in the direction from the middle position of the centrifugal blade towards the two ends of the corresponding 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 noise reduction device is better suitable for reducing the noise of 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 disc, wherein the mounting disc is used for being connected with a rotating part of the motor;
the edge part of the mounting plate is connected with the centrifugal blades, and the connecting part of the corresponding centrifugal blades and the mounting plate avoids the noise reduction micropores, 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 connection part of the corresponding centrifugal blade and the mounting plate is located between two adjacent micropore areas, so that the two adjacent micropore areas can ensure the integrity of the respective areas, and the influence of the noise reduction frequency bands corresponding to the two adjacent micropore areas is avoided.
Optionally, the depth of the noise reduction cavity is 3mm, and the aperture of the noise reduction micropore is 0.6mm;
the micropore areas are arranged on the lee surface 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;
each micropore area comprises a plurality of rows of noise reduction micropores in the length direction of the corresponding centrifugal blade, and the distance between every two adjacent rows of noise reduction micropores on each micropore area is 4.85mm;
on the width direction of the corresponding centrifugal blade, the distance between adjacent noise reduction micropores in the first micropore area is 8mm, the distance between adjacent noise reduction micropores in the second micropore area is 3mm, the distance between adjacent noise reduction micropores in the third micropore area is 2.2mm, and the distance between adjacent noise reduction micropores in the fourth micropore area is 4.8mm.
Therefore, the pneumatic noise with the main frequency (700 Hz-1250 Hz) generated by the fume exhaust equipment can be effectively absorbed, and the effectiveness of the noise reduction effect is improved.
The invention also provides a centrifugal fan, which comprises
Centrifugal volute; and
in the centrifugal impeller, the centrifugal impeller is arranged in the centrifugal volute.
The invention also provides a fume exhaust 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 that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an embodiment of a smoke exhaust apparatus of the present invention;
fig. 2 is a schematic cross-sectional structure of the cooking fume exhausting apparatus of fig. 1;
fig. 3 is a schematic structural view of a centrifugal fan of the range hood apparatus of fig. 1;
FIG. 4 is a schematic view of the centrifugal impeller of the centrifugal fan of FIG. 3;
FIG. 5 is a schematic view of a partial cross-sectional configuration of the centrifugal blades of the centrifugal impeller of FIG. 4;
FIG. 6 is a schematic view of the centrifugal blade of FIG. 5;
fig. 7 is a graph of the sound absorption coefficient of a centrifugal impeller of the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 1 | Centrifugal fan | 11 | Centrifugal volute |
| 12 | Centrifugal impeller | 121 | Centrifugal blade |
| 122 | Noise reduction structure | 123 | Noise reduction cavity |
| 124 | Microporous region | 125 | Noise reduction micropore |
| 126 | Leeward surface | 127 | Mounting plate |
| 124a | First microporous region | 124b | Second microporous region |
| 124c | Third microporous region | 124d | Fourth microporous region |
| 2 | Main body of cigarette machine | 21 | Fume collecting hood |
| 22 | Fan cover |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is involved in the embodiment of the present invention, the directional indication is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments 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 a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The present invention proposes a centrifugal impeller which is generally applied to centrifugal fans. The centrifugal fan is commonly applied to fume extraction equipment. The fume exhaust equipment can be a fume exhaust fan with fume exhaust function, and can also be an integrated kitchen range with fume exhaust function and other functions, wherein the other functions can be a function of sterilizing kitchen ware (integrated with a sterilizing cabinet), a function of cooking (integrated with a kitchen range, a microwave oven and the like), a function of cleaning kitchen ware (integrated with a dish washer) 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 will be appreciated that the micro-porous areas 124 with different perforation rates and the noise reduction cavities combined with the corresponding portions can reduce noise in different frequency bands, that is, noise reduction frequency bands of at least two micro-porous areas 124 are different, so that when the centrifugal fan 1 with the centrifugal impeller 12 is installed in an oil and smoke exhaust duct of the oil and smoke exhaust equipment, in the operation process of the oil and smoke exhaust equipment, pneumatic noise generated in the centrifugal volute 11 can reduce noise in different frequency bands through the noise reduction structure 122, and noise in different frequency bands in the pneumatic noise can be reduced through the micro-porous areas 124 with different noise reduction frequency bands, thereby realizing wide-frequency band noise reduction and further reducing operation noise of the oil and smoke exhaust equipment.
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 present design is not limited thereto, and in other embodiments, a part of the centrifugal blades may not be provided with the noise reduction structure 122, but only a part of the centrifugal blades 121 may be provided with the noise reduction structure 122, so that the centrifugal impeller 12 may have a wide-frequency noise reduction function. Of course, in order to ensure the rotation stability of the centrifugal impeller 12, for the technical solution of only providing the noise reduction structure 122 on a part of the centrifugal blades 121, the part of the centrifugal blades 121 provided with the noise reduction structure 122 may be uniformly distributed in a part of the centrifugal blades not provided with the noise reduction structure 122, for example, the centrifugal blades 121 provided with the noise reduction structure 122 and the centrifugal blades not provided with the noise reduction structure 122 may be 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 areas 124 are different, so that on the same centrifugal blade 121, the noise reduction frequency bands corresponding to the micro-hole areas 124 are different, thereby realizing noise reduction of the noise with multiple frequency bands as much as possible, and further improving the noise reduction frequency band width of the centrifugal impeller 12. Of course, in other embodiments, the perforation rates of the partial micro-hole areas 124 may be the same on the same centrifugal blade 121, so that the noise reduction frequency band of the partial micro-hole areas 124 is the same for the same centrifugal blade 121, for example, when the noise amount of noise in one frequency band is much larger than that of noise in other frequency bands, the perforation rates of two or more micro-hole areas 124 may be set to be the same.
Further, the micro-porous region 124 is provided on a leeward side 126 of the corresponding centrifugal blade 121. It will be appreciated that centrifugal blades 121 generally have a curvature with leeward side 126 disposed in a convex camber and windward side disposed in a concave camber; during rotation of the centrifugal impeller 12, the windward side is located at the front side of the leeward side 126 in the rotation direction, and the windward side receives a large wind pressure; if the micropore area is disposed on the windward side, the centrifugal impeller 12 rotates at a high speed, the wind pressure on the windward side is large, 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 micropore area 124 is disposed on the leeward side 126, so that not only can the vortex noise on the leeward side 126 be effectively absorbed and reduced, but also the problem of extra noise generated when the airflow passes through the noise reduction micropores 125 at high speed can be avoided.
Optionally, on the same centrifugal blade 121, the noise reduction cavities corresponding to any two adjacent micro-hole areas 124 are communicated, 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 corresponding to different micro-hole areas 124 are separated, the centrifugal blade 121 in the technical scheme is easier to process and is beneficial to batch preparation of products. However, the present design is not limited thereto, and in other embodiments, a partition may be disposed in the noise reduction cavity 123 to isolate the noise reduction cavity corresponding to the adjacent micro-hole area 124.
Optionally, referring to fig. 6, the leeward surface 126 is fully distributed on the corresponding centrifugal blade 121 by the plurality of micro-porous areas 124, so that the leeward surface 126 is fully utilized to absorb and reduce noise at more positions, thereby reducing the operation noise of the fume exhaust device more effectively.
Optionally, the 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, thereby improving the noise reduction performance of the product. Further alternatively, the centrifugal blade 121 is made of a sheet metal sheet by punching, bending and enclosing to form the noise reduction cavity 123 inside; accordingly, the noise reduction holes 125 are punched holes; the sheet metal stamping process is a mature processing process, which is beneficial to batch production 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, injection molding and core pulling.
Alternatively, referring to fig. 6, the plurality of micro-porous regions 124 are sequentially arranged in the length direction of the corresponding centrifugal blade 121. Without loss of generality, the centrifugal blades 121 are generally arranged in an elongated shape, i.e. their length is generally much greater than their width; in this embodiment, the plurality of micro-hole areas 124 are arranged along the length direction of the corresponding centrifugal blade 121, which is beneficial to separate and realize different micro-hole areas 124. However, the present design is not limited thereto, and in other embodiments, when the width of the centrifugal blade 121 is also large, particularly when the width and the length of the centrifugal blade 121 are not greatly different, the plurality of micro-hole areas 124 may be sequentially arranged in the width direction of the corresponding 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 the micropore area 124 can be arranged regularly, which is beneficial to producing a batch and consistent product. Alternatively, the noise reduction micro holes 125 may be provided as, but not limited to, circular holes or polygonal holes or shaped holes, etc.
In this embodiment, optionally, each micropore area 124 includes a plurality of rows of noise reduction micropores 125 in the length direction of the corresponding centrifugal blade 121, and the intervals between adjacent rows of noise reduction micropores 125 in different micropore areas 124 are the same, that is, the intervals between any two adjacent rows of noise reduction micropores 125 are the same in the whole centrifugal blade 121, so that, for the micropore areas 124 with different threading rates, only the intervals between two adjacent noise reduction micropores 125 in the same row of noise reduction micropores 125 in the same area need to be changed, and the design of the micropore areas 124 with different threading rates can be simplified; in addition, the adjacent rows of noise reduction micropores 125 on different micropore areas 124 have the same interval, so that the complexity of the whole noise reduction micropore group on the centrifugal blade 121 can be reduced, and the processing convenience of the centrifugal blade 121 can be improved.
Further, the perforation rates of the different microporous regions 124 gradually decrease in the direction from the middle position toward both ends of the centrifugal blade 121 in correspondence with the centrifugal blade 121. It can be appreciated that the noise reduction frequency band corresponding to the empty region 124 with smaller perforation rate is lower; for the centrifugal impeller 12, the axial air inlet and the radial air outlet are adopted, that is, the air inlet of the centrifugal impeller 12 is positioned at two opposite axial ends of the centrifugal impeller, and the air inlet of the centrifugal impeller 12 generally forms lower-frequency noise, so that the perforation rate of the micropore areas 124 near the two ends of the centrifugal blades 121 is set smaller, and the noise reduction of the lower-frequency noise at the air inlet of the centrifugal impeller 12 can be better adapted, 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 being adapted to be connected to a rotating portion of the motor;
the edge portion of the mounting plate 127 is connected with the centrifugal blade 121, and the connection portion of the corresponding centrifugal blade 121 and the mounting plate 127 avoids the noise reduction micropores 125.
It will be appreciated that the motor rotates the mounting plate 127, which in turn rotates the centrifugal blades 121, ultimately reducing aerodynamic noise through the noise reduction structure 122. In this embodiment, the installation plate 127 can provide installation attachment for the centrifugal blade 121, so as to reduce the falling probability of the centrifugal blade 121; at the same time, the provision of the mounting plate 127 also helps to ensure stability of the centrifugal impeller 12 during rotation. Furthermore, in this embodiment, the connection between the centrifugal blade 121 and the mounting plate 127 avoids the noise reduction micro-holes 125, so that the noise reduction micro-holes 125 have a complete structure, and the noise reduction function corresponding to the noise reduction micro-holes 125 is not damaged.
In this embodiment, optionally, the connection between the centrifugal blade 121 and the mounting plate 127 is located between two adjacent micro-hole areas 124, so that the two adjacent micro-hole areas 124 can ensure the integrity of the respective areas, so as to avoid the influence of the noise reduction frequency bands corresponding to the two adjacent micro-hole areas.
In this embodiment, specifically, the depth of the noise reduction cavity 123 is 3mm, and the aperture of the noise reduction micro-hole 125 is 0.6mm;
the micropore areas 124 are arranged on the leeward side 126 of the corresponding centrifugal blade 121, and the micropore areas 124 comprise a first micropore area 124a, a second micropore area 124b, a third micropore area 124c and a fourth micropore area 124d which are sequentially arranged in the length direction of the corresponding centrifugal blade 121;
each micropore area 124 comprises a plurality of rows of noise reduction micropores 125 along the length direction of the corresponding centrifugal blade 121, and the distance between adjacent rows of noise reduction micropores 125 on each micropore area 124 is 4.85mm;
in the width direction of the corresponding centrifugal blade 121, the distance between the adjacent noise reduction micro holes 125 on the first micro hole area 124a is 8mm, the distance between the adjacent noise reduction micro holes 125 on the second micro hole area 124b is 3mm, the distance between the adjacent noise reduction micro holes 125 on the third micro hole area 124c is 2.2mm, and the distance between the adjacent noise reduction micro holes 125 on the fourth micro hole area 124d is 4.8mm.
In this way, the noise reduction frequency bands corresponding to the four micro-porous regions 124 (first to fourth micro-porous regions) may be 700Hz to 800Hz, 950Hz to 1150Hz, 1150Hz to 1250Hz, and 800Hz to 950Hz in this order. According to the acoustic analog line, the four micro-hole areas 124 belong to a parallel structure, and the sound absorption effect is superposition of four sections of sound absorption effects, so that the centrifugal impeller 12 provided by the embodiment can absorb pneumatic noise in the frequency range of 700Hz-1350Hz, and the frequency range of 700Hz-1250Hz is the main frequency of the pneumatic noise generated by the oil fume absorbing device, so that the adoption of the centrifugal fan 1 with the centrifugal impeller 12 can effectively reduce the pneumatic noise of the oil fume absorbing device.
Specifically, referring to fig. 7, it can be seen that the sound absorption coefficient of the centrifugal impeller 12 provided in this embodiment may reach 0.4 or more at 700Hz-1250Hz, and the centrifugal impeller 12 may effectively reduce the overall noise reduction level of the fume exhaust device.
It should be noted that the specific parameters described above with respect to the centrifugal impeller 12 are not limited to the above, and for example, when the aperture of the noise reduction micro-holes 125 is not 0.6mm, if the micro-hole areas 122 are to be made capable of reducing noise in the same frequency band, the perforation rate of the micro-hole areas 124 (the distance between the noise reduction micro-holes 125 in the length direction and/or the width direction of the centrifugal blade 121 on the micro-hole areas 124) 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 foregoing embodiments, and since the centrifugal fan 1 adopts all the technical solutions of all the foregoing embodiments, at least all the beneficial effects brought by the technical solutions of the foregoing embodiments are not described herein again.
Referring to fig. 1 and fig. 2, the present invention further provides a range hood device, where the range hood device includes a centrifugal fan 1, and the specific structure of the centrifugal fan 1 refers to the above embodiment, and since the range hood device adopts all the technical solutions of all the embodiments, at least the range hood device has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein. Referring to fig. 1, the range hood device is specifically a range hood, and further comprises a range hood main body 2, wherein a range hood air duct is arranged in the range hood main body 2, a smoke inlet of the range hood air duct is communicated with an indoor space, a smoke outlet is used for being communicated with an outdoor space, and a centrifugal fan 1 is arranged in the range hood air duct and is usually arranged close to the smoke outlet. The main body 2 of the extractor hood 2 generally includes an extractor hood 21 and a blower housing 22 disposed above the extractor hood 21, and the centrifugal blower 1 is generally disposed within the blower housing 22.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (8)
1. A centrifugal impeller, comprising:
the centrifugal blades are arranged in a ring 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 at least two micropore areas have different penetration rates;
for the corresponding centrifugal blade, the perforation rates of different micropore areas gradually decrease in the direction from the middle position of the centrifugal blade towards the two ends, so that the noise reduction frequency bands corresponding to the different micropore areas gradually decrease in the direction from the middle position of the centrifugal blade towards the two ends; the micro-hole areas are arranged on the lee surfaces of the corresponding centrifugal blades, the lee surfaces are fully distributed on the corresponding centrifugal blades, the noise reduction micro-holes in each micro-hole area are arranged in an array, each micro-hole area comprises a plurality of noise reduction micro-holes in columns in the length direction of the corresponding centrifugal blades, the intervals between the noise reduction micro-holes in adjacent columns on different micro-hole areas are the same, and the intervals between the noise reduction micro-holes in the same column on each micro-hole area are different;
the centrifugal impeller further comprises a mounting disc, wherein the mounting disc is used for being connected with a rotating part of the motor; the edge part of the installation disc is connected with the centrifugal blades, the connecting parts of the corresponding centrifugal blades and the installation disc avoid the noise reduction micropores, and the connecting parts of the corresponding centrifugal blades and the installation disc are positioned between two adjacent micropore areas.
2. A 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 perforation rates of the plurality of microporous regions are different from one another on the same centrifugal blade.
4. The centrifugal impeller of claim 1, wherein the noise reduction cavities corresponding to any two adjacent micropore areas are communicated with each other on the same centrifugal blade.
5. The centrifugal impeller of claim 1, wherein the plurality of microporous regions are arranged in sequence in a length direction of the corresponding centrifugal blades.
6. The centrifugal impeller of claim 1, wherein the depth of the noise reduction cavity is 3mm, and the aperture of the noise reduction micro-hole is 0.6mm;
the micropore areas are arranged on the lee surface 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;
each micropore area comprises a plurality of rows of noise reduction micropores in the length direction of the corresponding centrifugal blade, and the distance between every two adjacent rows of noise reduction micropores on each micropore area is 4.85mm;
on the width direction of the corresponding centrifugal blade, the distance between adjacent noise reduction micropores in the first micropore area is 8mm, the distance between adjacent noise reduction micropores in the second micropore area is 3mm, the distance between adjacent noise reduction micropores in the third micropore area is 2.2mm, and the distance between adjacent noise reduction micropores in the fourth micropore area is 4.8mm.
7. A centrifugal fan, comprising:
centrifugal volute; and
a centrifugal impeller according to any one of claims 1 to 6, provided within the centrifugal volute.
8. A range hood apparatus comprising the centrifugal fan of claim 7.
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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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| CN114483644A (en) | 2022-05-13 |
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