CN113738664B - Noise reduction fan - Google Patents
Noise reduction fan Download PDFInfo
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- CN113738664B CN113738664B CN202111080610.3A CN202111080610A CN113738664B CN 113738664 B CN113738664 B CN 113738664B CN 202111080610 A CN202111080610 A CN 202111080610A CN 113738664 B CN113738664 B CN 113738664B
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- 230000009467 reduction Effects 0.000 title claims abstract description 49
- 238000010521 absorption reaction Methods 0.000 claims abstract description 27
- 230000007423 decrease Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 16
- 230000035515 penetration Effects 0.000 description 15
- 239000011295 pitch Substances 0.000 description 8
- 239000000779 smoke Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000391 smoking effect Effects 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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
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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
- 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
- F04D29/664—Sound attenuation by means of sound absorbing material
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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 noise reduction fan, and relates to a fan. At present, the sound-absorbing assembly adopts equidistant noise-reducing holes, so that only noise in a certain frequency band can be absorbed and reduced. The noise reduction fan comprises a volute, an impeller arranged in the volute and a motor for driving the impeller, wherein the volute comprises a front plate, a rear plate and a side plate arranged between the front plate and the rear plate; the inner side contour line of the side plate forms a volute molded line, the side plate is provided with a plurality of first through holes, and the periphery of the side plate is provided with a sound absorption layer opposite to the first through holes; the rear plate is provided with an air inlet; the space size of the adjacent first through holes is larger than or equal to two, so that multiple hole ratios of the side plates are formed. According to the technical scheme, different through hole rates are adopted in different places of the side plates, noise in multiple frequency bands can be absorbed and reduced, and effective reduction of low-frequency noise and high-frequency noise is achieved under the combined action of the sound absorption layers, so that the aim of overall noise reduction is fulfilled.
Description
Technical Field
The invention relates to a fan, in particular to a noise reduction fan.
Background
The fan is one of the main parts of the integrated kitchen, has the effect of sucking and exhausting kitchen oil smoke, drives the impeller to rotate through the power of the fan, so that the oil smoke passing through the smoke inlet is sucked into the inner wheel, and is exhausted outdoors through the air outlet of the fan and the smoke pipe, and cleaner kitchen indoor air is provided for users. At present, in order to improve the smoking effect, the integrated kitchen adopts the fan of big amount of wind to inhale the kitchen oil smoke to arrange generally, but along with the increase of amount of wind, the noise of fan also increases thereupon, brings relatively poor experience for the consumer to bring certain health risk. In order to solve the problem, as shown in fig. 1, some integrated stoves use a sound absorbing component coated on the side wall of a volute of a fan, and the sound absorbing component is fixed by a sheet metal part to realize noise reduction, and the sound absorbing component adopts equidistant noise reduction holes, so that noise in a certain frequency band can be absorbed and reduced in noise reduction, and the noise frequency band in the fan is wider, so that the whole sound absorbing effect is limited by arranging equidistant holes, thereby resulting in unsatisfactory noise reduction.
Disclosure of Invention
The invention aims to solve the technical problems and the technical task of improving and improving the prior art scheme and provides a noise reduction fan so as to achieve the purpose of reducing fan noise. For this purpose, the present invention adopts the following technical scheme.
The noise reduction fan comprises a volute, an impeller arranged in the volute and a motor for driving the impeller, wherein the volute comprises a front plate, a rear plate and a side plate arranged between the front plate and the rear plate; the inner side contour line of the side plate forms a volute molded line, the side plate is provided with a plurality of first through holes, and the periphery of the side plate is provided with a sound absorption layer opposite to the first through holes; the rear plate is provided with an air inlet; the method is characterized in that: the space size of the adjacent first through holes is larger than or equal to two, so that multiple hole ratios of the side plates are formed. According to the technical scheme, different through hole rates are adopted in different places of the side plates, noise in multiple frequency bands can be absorbed and reduced, and effective reduction of low-frequency noise and high-frequency noise is achieved under the combined action of the sound absorption layers, so that the aim of overall noise reduction is fulfilled.
As a preferable technical means: the volute molded line of the side plate, which is close to the volute tongue, is a radial high-pressure end; the volute molded line of the side plate, which is close to the air outlet, is a radial low-pressure end; the first through hole spacing of the side plates is gradually increased from the volute molded line along the radial high-pressure end to the radial low-pressure end, so that the corresponding through hole rate of the side plates is gradually reduced from the volute molded line along the radial high-pressure end to the radial low-pressure end. The side plates adopt high through hole rate at the radial high-pressure end, and relatively low through hole rate at the radial low-pressure end, and the corresponding through hole rate is set according to noise in different frequency bands, so that noise can be better absorbed and reduced, the effective reduction of low-frequency and high-frequency noise is realized, and the purpose of overall noise reduction is further achieved.
As a preferable technical means: the side plate is axially high-pressure end close to the front plate, and the side plate is axially low-pressure end close to the rear plate; the first through hole spacing of the side plates gradually decreases from the axial low pressure end to the axial high pressure end along the axial direction of the volute, so that the corresponding through hole ratio of the side plates gradually increases from the axial low pressure end to the axial high pressure end along the axial direction of the volute. According to the technical scheme, different hole ratios are also arranged in the axial direction, low hole ratios are adopted at the axial low-pressure end, low hole ratios are adopted at the axial high-pressure end, and the noise reduction effect is submitted according to the corresponding hole ratios of different pressures and the arrangement of noise frequency bands generated by the pressures in the axial direction; the high through hole rate can be adopted at the radial high-pressure end, and the relatively low through hole rate can be adopted at the radial low-pressure end; the frequency range of noise reduction is wider, so that the noise is further reduced, and the noise of the whole machine is lower.
As a preferable technical means: the circumferential distance between adjacent first through holes of the radial low-pressure end is A; wherein A is more than or equal to 10mm and less than or equal to 14mm; the circumferential distance between adjacent first through holes of the radial high-pressure end is B; wherein B is more than or equal to 6mm and less than or equal to 10mm. The penetration rate of noise is ensured, the frequency range of the noise can be reduced, and good absorption of sound waves by the sound absorbing layer is promoted.
As a preferable technical means: the axial distance between adjacent first through holes of the radial low-pressure end is A; wherein A is more than or equal to 10mm and less than or equal to 14mm; the axial distance between adjacent first through holes of the radial high-pressure end is B; wherein B is more than or equal to 6mm and less than or equal to 10mm. The penetration rate of noise is further guaranteed, the frequency range of noise reduction can be effectively covered, good absorption of sound waves by the sound absorption layer is promoted, and the overall noise reduction effect is improved.
As a preferable technical means: the aperture of the first through hole is D, wherein D is more than or equal to 1.8mm and less than or equal to 2.8mm. The penetration rate of noise is ensured.
As a preferable technical means: the aperture ratio of the side plate is p1; wherein, p1 is more than or equal to 1.8 percent and less than or equal to 9.6 percent. The aperture ratio has a proper span range, and can give consideration to the penetration rate and the noise reduction effect of multiple frequency bands, thereby improving the overall noise reduction effect.
As a preferable technical means: the sound absorption layer is propped against the outer side surface of the side plate through the fixing plate; the fixed plate is provided with a second through hole; the through hole rate of the fixing plate is larger than that of the side plate. The penetration rate of noise to the sound absorption layer is guaranteed, the sound absorption layer is promoted to absorb sound waves well, and the overall noise reduction effect is good. The fixing plate can be welded with the side plate, so that the fixing plate is connected with the side plate; of course, the fixing plate and the side plate can be detachably connected by adopting a connecting mode through a connecting piece, and the sound absorption layer can be conveniently replaced by adopting the connecting mode, so that the fan is beneficial to cleaning.
As a preferable technical means: the aperture ratio of the fixed plate is p2; wherein, p2 is more than or equal to 10 percent and less than or equal to 25 percent. The strength of the fixing plate can be considered, and the connection reliability and the penetration rate of noise to the sound absorption layer are ensured.
As a preferable technical means: the diameter of the second through hole is E, wherein E is more than or equal to 3mm and less than or equal to 5mm; the distance between adjacent second through holes is C, wherein C is more than or equal to 6mm and less than or equal to 8mm. The second through holes have proper diameter ranges and proper distances, so that the strength of the fixing plate is ensured, and the connection reliability of the fixing plate is improved; but also can improve the penetration rate of noise to the sound absorption layer and the overall noise reduction effect.
As a preferable technical means: the second through hole is a square hole with the width matched with the width of the fixed plate; the width of the square hole frame is W, wherein W is more than or equal to 10mm and less than or equal to 30mm. The second through hole is matched with the fixed plate in width, so that shielding of the sound-absorbing layer is reduced, and the penetration rate of noise to the sound-absorbing layer is improved; the fixed plate frame can be used for propping the sound absorption layer on the side plate, so that the sound absorption layer can be coated on the side plate, and the noise reduction effect and the connection reliability are ensured.
As a preferable technical means: the side plate is divided into a plurality of areas along the circumferential direction, each area is divided into a plurality of units, the distances between the first through holes in the same unit are the same, and the distances between the first through holes of adjacent units are different so as to form units with different through hole rates; the pitches of the first through holes of the corresponding units of different areas are the same. Because the size of the side plate in the circumferential direction is far greater than the radial size of the side plate, the side plate is divided into a plurality of areas in the circumferential direction, one area corresponds to one stamping of the stamping die, and the plurality of areas correspond to multiple stamping of the stamping die, so that the stamping work of the stamping die for machining the first through hole of the side plate can be realized through movement, the cost is reduced, and the volume of the stamping die is reduced.
As a preferable technical means: the circumferential spacing and/or the radial spacing of the first through holes of adjacent units in the same region are different.
As a preferable technical means: the circumferential pitches of the first through holes of adjacent units in the same region are different.
As a preferable technical means: the volute is vertically arranged, and an oil leakage hole is formed in the middle of the lowest position of the side plate; the aperture of the oil leakage hole is at least 3 times that of the first through hole.
The beneficial effects are that: according to the technical scheme, different through hole rates are adopted in different places of the side plates, noise in multiple frequency bands can be absorbed and reduced, and effective reduction of low-frequency noise and high-frequency noise is achieved under the combined action of the sound absorption layers, so that the aim of overall noise reduction is fulfilled.
Drawings
Fig. 1 is a schematic diagram of a prior art structure.
Fig. 2 is a schematic view of a volute structure according to a first embodiment of the invention.
Fig. 3 is a schematic view of a volute explosion structure according to a first embodiment of the present invention.
FIG. 4 is a schematic view of the radial pressure inside the fan of the present invention.
FIG. 5 is a schematic view of the internal axial pressure of the fan of the present invention.
Fig. 6 is a schematic view showing a side plate development structure according to the first embodiment of the present invention.
Fig. 7 is a schematic view showing an unfolding structure of a fixing plate according to a first embodiment of the present invention.
Fig. 8 is a schematic diagram of a volute explosion structure according to a second embodiment of the present invention.
Fig. 9 is a schematic view showing a side plate development structure of a third embodiment of the present invention.
Fig. 10 is a schematic perspective view of a side plate bent according to the third embodiment of the present invention.
In the figure: 1. a front plate; 2. a rear plate; 3. a side plate; 301. a first through hole; 4. a sound absorbing layer; 5. an air inlet; 6. a volute tongue; 7. a radial high pressure end; 8. a radial low pressure end; 9. an axial high pressure end; 10. an axial low pressure end; 11. a fixing plate; 1101. a second through hole; 12. an air outlet; 13. and an oil leakage hole.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the attached drawings.
In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present invention may be arranged in different directions, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to directions opposite or coincident with the direction of gravity.
Embodiment one:
as shown in fig. 4, in the radial direction of the circumference inside the fan, the flow field pressure at the rear end of the volute tongue 6 is higher, the noise frequency band is also higher, the flow field pressure is lower, and the noise frequency band is also lower at the air outlet 12.
As shown in fig. 5, in the fan, in the axial direction, the flow field pressure at the air inlet 5 is lower, the noise frequency band is lower, the closer to the rear plate 2 of the fan, the higher the flow field pressure is, the higher the noise frequency band is, the more complex the flow field is in the fan as shown in fig. 4 and 5, and the range of the noise frequency band is wider.
In order to reduce noise, the invention adopts the following structure:
as shown in fig. 2, 3, 6, 7, the present invention includes a scroll casing including a front plate 1, a rear plate 2, and a side plate 3 disposed between the front plate 1 and the rear plate 2, an impeller disposed in the scroll casing, and a motor for driving the impeller; the inner side contour line of the side plate 3 forms a volute molded line, the side plate 3 is provided with a plurality of first through holes 301, and the periphery of the side plate 3 is provided with a sound absorption layer 4 opposite to the first through holes 301; the rear plate 2 is provided with an air inlet 5; the volute molded line of the side plate 3, which is close to the volute tongue 6, is provided with a radial high-pressure end 7; the volute molded line of the side plate 3 close to the air outlet 12 is provided with a radial low-pressure end 8; the porosity of the side plates 3 gradually decreases from the volute line along which the radial high-pressure end 7 follows to the radial low-pressure end 8. Different through hole rates are adopted in different places of the side plate 3 of the technical scheme, high through hole rates are adopted at the radial high-voltage end 7, relatively low through hole rates are adopted at the radial low-voltage end 8, noise in multiple frequency bands can be absorbed and reduced, and effective reduction of low-frequency and high-frequency noise is achieved under the combined action of the sound absorption layer 4, so that the aim of overall noise reduction is achieved. The sound absorbing layer 4 may be a flexible body with air holes such as sound absorbing cotton and sponge.
When the volute is vertically arranged, in order to prevent oil from accumulating on the side plate 3, an oil leakage hole 13 is formed in the middle of the lowest position of the side plate 3, and oil flows out of the oil leakage hole 13; the diameter of the oil leakage hole 13 is far larger than that of the first through hole 301, and the diameter of the oil leakage hole 13 is at least 3 times that of the first through hole 301.
To further expand the noise reduction band: the side plate 3 is provided with an axial high-pressure end 9 near the front plate 1, and the side plate 3 is provided with an axial low-pressure end 10 near the rear plate 2; the through-hole ratio of the side plate 3 increases gradually from the axial low pressure end 10 to the axial high pressure end 9 along the axial direction of the scroll casing. The technical scheme is that different hole ratios are also arranged in the axial direction, and a low hole ratio is adopted at the axial low-pressure end 10; a low through hole rate is adopted at the axial high-pressure end 9; a high through-hole rate is adopted in combination at the radial high-pressure end 7, and a relatively low through-hole rate is adopted at the radial low-pressure end 8; the frequency range of noise reduction is wider, so that the noise is further reduced, and the noise of the whole machine is lower.
In order to ensure the penetration rate of noise and also to reduce the frequency range of noise, in this embodiment: the circumferential distance between adjacent first through holes 301 of the radial low pressure end 8 is A; wherein A is 12mm; the circumferential distance between adjacent first through holes 301 of the radial high-pressure end 7 is B; wherein B is 8mm.
The axial distance between adjacent first through holes 301 of the radial low pressure end 8 is also A; a is 12mm; the axial distance between adjacent first through holes 301 of the radial high-pressure end 7 is also B; wherein B is 8mm.
The above may form the region where the via ratio is lowest: the axial and circumferential spacing of adjacent first through holes 301 is 12mm; the area with the highest through hole ratio: the axial and circumferential spacing of adjacent first through holes 301 is 8mm; the axial and circumferential spacing between adjacent first through holes 301 of the remaining regions is between 8-12mm, forming various combinations; the frequency band range for reducing noise is enlarged. The overall noise reduction effect is effectively improved.
The first through hole 301 has a diameter D, wherein D is 1.8 mm.ltoreq.D.ltoreq.2.8 mm. The first through hole 301 with the aperture can prevent excessive oil from penetrating into the silencing layer, so that the service life of the silencing layer is guaranteed, the size of the aperture D of the first through hole 301 is limited, excessive pressure difference change caused by excessive aperture is avoided, and then energy is lost too much, so that energy efficiency is affected. The size of the aperture can be different according to the power of the fan, and the corresponding aperture can be selected to ensure the penetration rate of noise.
In order to give consideration to the penetration rate and the noise reduction effect of multiple frequency bands: the aperture ratio of the side plate 3 is p1; wherein, p1 is more than or equal to 1.8 percent and less than or equal to 9.6 percent; the through hole rate has a proper span range, realizes the noise elimination of multi-band noise to improve whole noise reduction effect, also can avoid too much fluid infiltration to go into the amortization layer, guarantee amortization layer operational reliability, promote the life of amortization layer.
In order to improve the connection reliability of the sound-absorbing layer 4, the sound-absorbing layer 4 is pressed against the outer side surface of the side plate 3 through the fixing plate 11; the fixed plate 11 is provided with a second through hole 1101; the fixing plate 11 has a larger hole ratio than the side plate 3. The penetration rate of noise to the sound absorption layer 4 is guaranteed, the sound absorption layer 4 can absorb sound waves well, and the overall noise reduction effect is good. The fixing plate 11 can be welded with the side plate 3 to realize the connection of the fixing plate 11 and the side plate 3; of course, the fixing plate 11 and the side plate 3 can be connected by a connecting piece, so that the fixing plate 11 and the side plate 3 can be detachably connected, and the sound absorption layer 4 can be conveniently replaced by the connecting piece, thereby being beneficial to cleaning of a fan. The connecting piece can be a screw, a buckle and the like.
To achieve the strength and noise reduction effect of the fixing plate 11: the through hole ratio of the fixing plate 11 is p2; wherein, p2 is more than or equal to 10 percent and less than or equal to 25 percent. The strength of the fixing plate 11 can be considered, and the connection reliability and the penetration rate of noise to the sound absorption layer 4 can be ensured.
To ensure the strength of the fixing plate 11 and the penetrability of noise: the diameter of the second through hole 1101 is E, wherein E is more than or equal to 3mm and less than or equal to 5mm; the spacing between adjacent second through holes 1101 is C, wherein C is 6 mm.ltoreq.C.ltoreq.8 mm. The second through holes 1101 have a proper diameter range and an adjacent hole spacing, so that the strength of the fixing plate 11 is ensured, and the connection reliability is improved; but also can improve the penetration rate of noise to the sound absorption layer 4 and the overall noise reduction effect.
Example two
As shown in fig. 8, the same points as those of the first embodiment are not described again, and the difference is that:
the second through hole 1101 is a square hole with a width matched with the width of the fixing plate 11; the width of the square hole frame is W, wherein W is more than or equal to 10mm and less than or equal to 30mm. The second through holes 1101 are matched with the fixing plate 11 in width, so that shielding of the sound absorption layer 4 is reduced, and the penetration rate of noise to the sound absorption layer 4 is improved; the sound absorbing layer 4 can be propped against the side plate 3 by the frame of the fixing plate 11, so that the sound absorbing layer 4 can be coated on the side plate 3, and the noise reduction effect and the connection reliability are ensured.
Embodiment III:
as shown in fig. 9 and 10, for convenience of manufacture, the side plate 3 is divided into a plurality of regions along the circumferential direction, each region is divided into a plurality of units, the first through holes 301 in the same unit have the same pitch, and the first through holes 301 in adjacent units have different pitches to form units with different through hole ratios; the pitches of the first through holes 301 of the corresponding cells of the different regions are the same. Because the size of the side plate in the circumferential direction is far greater than the radial size of the side plate, the side plate is divided into a plurality of areas in the circumferential direction, one area corresponds to one stamping of the stamping die, and the plurality of areas correspond to multiple stamping of the stamping die, so that the stamping work of the stamping die for machining the first through hole of the side plate can be realized through movement, the cost is reduced, and the volume of the stamping die is reduced.
The circumferential and/or radial pitches of the first through holes 301 of adjacent cells of the same region are different. In this embodiment, the circumferential pitches of the first through holes 301 of the same area adjacent units are different, and the radial pitches of the first through holes 301 of the same area adjacent units are the same, so that the processing is more convenient.
The noise reduction fan shown in fig. 2-10 is a specific embodiment of the present invention, has already demonstrated the substantial characteristics and improvements of the present invention, and can be modified in terms of shape, structure, etc. according to practical use requirements, and in the light of the present invention, all are within the scope of protection of the present invention.
Claims (9)
1. The noise reduction fan comprises a volute, an impeller arranged in the volute and a motor for driving the impeller, wherein the volute comprises a front plate (1), a rear plate (2) and a side plate (3) arranged between the front plate (1) and the rear plate (2); the inner side contour line of the side plate (3) forms a volute molded line, the side plate (3) is provided with a plurality of first through holes (301), and the periphery of the side plate (3) is provided with a sound absorption layer (4) opposite to the first through holes (301); the rear plate (2) is provided with an air inlet (5); the method is characterized in that: the space size of the adjacent first through holes (301) is larger than or equal to two, so that various hole ratios of the side plates (3) are formed;
the volute molded line of the side plate (3) close to the volute tongue (6) is a radial high-pressure end (7); the volute molded line of the side plate (3) close to the air outlet (12) is a radial low-pressure end (8); the distance between the first through holes (301) of the side plates (3) is gradually increased from the volute molded line along which the radial high-pressure end (7) is arranged to the radial low-pressure end (8), so that the corresponding through hole rate of the side plates (3) is gradually reduced from the volute molded line along which the radial high-pressure end (7) is arranged to the radial low-pressure end (8);
an axial high-pressure end (9) is arranged at a position, close to the front plate (1), of the side plate (3), and an axial low-pressure end (10) is arranged at a position, close to the rear plate (2), of the side plate (3); the first through hole (301) spacing of the side plates (3) gradually decreases from the axial low pressure end (10) to the axial high pressure end (9) along the axial direction of the volute, so that the corresponding through hole ratio of the side plates (3) gradually increases from the axial low pressure end (10) to the axial high pressure end (9) along the axial direction of the volute.
2. A noise reduction fan as defined in claim 1, wherein: the circumferential distance between adjacent first through holes (301) of the radial low-pressure end (8) is A; wherein A is more than or equal to 10mm and less than or equal to 14mm; the circumferential distance between adjacent first through holes (301) of the radial high-pressure end (7) is B; wherein B is more than or equal to 6mm and less than or equal to 10mm.
3. A noise reduction fan as defined in claim 1, wherein: the aperture of the first through hole (301) is D, wherein D is more than or equal to 1.8mm and less than or equal to 2.8mm.
4. A noise reduction fan as defined in claim 2, wherein: the aperture ratio of the side plate (3) is p1; wherein, p1 is more than or equal to 1.8 percent and less than or equal to 9.6 percent.
5. A noise reduction fan as defined in claim 1, wherein: the sound absorption layer (4) is propped against the outer side surface of the side plate (3) through the fixing plate (11); the fixed plate (11) is provided with a second through hole (1101); the through hole rate of the fixing plate (11) is larger than that of the side plate (3).
6. The noise reduction fan as defined in claim 5, wherein: the through hole ratio of the fixed plate (11) is p2; wherein, p2 is more than or equal to 10 percent and less than or equal to 25 percent.
7. The noise reduction fan as defined in claim 6, wherein: the diameter of the second through hole (1101) is E, wherein E is more than or equal to 3mm and less than or equal to 5mm; the distance between adjacent second through holes (1101) is C, wherein C is more than or equal to 6mm and less than or equal to 8mm.
8. The noise reduction fan as defined in claim 6, wherein: the second through hole (1101) is a square hole with the width matched with the width of the fixed plate (11); the width of the square hole frame is W, wherein W is more than or equal to 10mm and less than or equal to 30mm.
9. A noise reduction fan as defined in claim 1, wherein: the volute is vertically arranged, and an oil leakage hole (13) is formed in the middle of the lowest position of the side plate (3); the aperture of the oil leakage hole (13) is at least 3 times that of the first through hole (301).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111080610.3A CN113738664B (en) | 2021-09-15 | 2021-09-15 | Noise reduction fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111080610.3A CN113738664B (en) | 2021-09-15 | 2021-09-15 | Noise reduction fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113738664A CN113738664A (en) | 2021-12-03 |
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