CN107654398A - A kind of noise elimination high-speed centrifugal fan - Google Patents
A kind of noise elimination high-speed centrifugal fan Download PDFInfo
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- CN107654398A CN107654398A CN201710989357.0A CN201710989357A CN107654398A CN 107654398 A CN107654398 A CN 107654398A CN 201710989357 A CN201710989357 A CN 201710989357A CN 107654398 A CN107654398 A CN 107654398A
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- impeller
- blade
- noise elimination
- centrifugal fan
- speed centrifugal
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- 230000008030 elimination Effects 0.000 title claims abstract description 75
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 75
- 238000004080 punching Methods 0.000 claims abstract description 9
- 238000007493 shaping process Methods 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 20
- 239000000945 filler Substances 0.000 claims description 13
- 229920000742 Cotton Polymers 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000011490 mineral wool Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 38
- 230000009467 reduction Effects 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 11
- 238000010276 construction Methods 0.000 description 13
- 238000013461 design Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
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- 230000003321 amplification Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 238000007514 turning Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000009423 ventilation 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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- 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
-
- 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
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
-
- 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
-
- 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
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention relates to a kind of noise elimination high-speed centrifugal fan, including casing, air inlet, blade, front shroud of impeller, back shroud of impeller and motor, front shroud of impeller to separate with blade；The inside edge of front shroud of impeller is connected with air inlet, and outer ledge is connected with the cylinder being fixed on air inlet, and it is smooth surface and the interior hollow cylinder gradually increased to both ends middle without leave that front shroud of impeller, air inlet and cylinder, which form an inwall,；It is cavity between the inwall and outer wall of hollow cylinder；Through hole is provided with the surface of hollow cylinder and air flow contacts, punching rate is 20~30%, aperture >=4mm of through hole, filling deadener in cavity.The present invention separates blade with front shroud of impeller, significantly reduces difficulty of processing, blade and back shroud of impeller are integrally machined shaping, improve blower pressure；Through hole is opened up on the surface of hollow cylinder and air flow contacts, forms dissipative muffler, gas-flow resistance is small, and the pressure loss is small, excellent noise reduction effect.
Description
Technical field
The invention belongs to universal machine field of ventilation equipment, is related to a kind of noise elimination high-speed centrifugal fan.
Background technology
Centrifugal blower is the pressure energy and kinetic energy that gas is converted to using the mechanical energy of draught fan impeller rotation, and gas is defeated
See off, gas is rotated through impeller and produces air energy along the streamlined air inlet air inlet through hollow shaft of blower fan, along screw type housing by gas
Body radially exports, then is sent out from shell air outlet.In centrifugal blower, gas is from axially into impeller, when gas flows through impeller
It is radially redirected, subsequently into diffuser.In diffuser, the gas and changing flow direction and increase of conduit section area makes
Flow slowing down, this decelerating effect convert kinetic energy into pressure energy.Pressure, which increases, to be occurred mainly in impeller, secondly occurs expanding
Press through journey.
Centrifugal blower essential structure is as shown in figure 1, including casing, air inlet, blade, front shroud of impeller, back shroud of impeller
And motor, in the manufacture of existing Small Centrifugal Fan, blade, front shroud of impeller and back shroud of impeller are often integrally machined, its
Complicated integral structure, difficulty of processing is big, and generally requiring five axles and above machining center could process, and processing cost is higher, and by
Material properties limit, and bulk strength is poor, is only capable of meeting the slow-speed of revolution and the requirement of low-pressure；And, collection high for matching requirements
Stream device and impeller assembling gap cross conference and cause pressure leakage, it is difficult to ensure fan outlet pressure.
Centrifugal blower work noise main source is the electromagnetic noise of the aerodynamic noise that blower fan rotational band is come and motor.
When centrifugal blower works, by motor moving blade, air is sucked vertically and radially excludes air, can be produced at work
Raw noise and vibration, particularly small-sized high speed centrifugal blower fan rotating speed are high, can typically reach 6000 turns, blower air kinetic noise
It is very big；And the electromagnetic noise of this high-speed electric expreess locomotive is equally very high, this noise can have a strong impact on the physical and mental health of staff.
Therefore, a kind of processing of exploitation is simple, cost is cheap, matching requirements are low, good integral strength can meet high-revolving want
Ask and the great realistic meaning of noise elimination high-speed centrifugal fan of excellent noise reduction effect.
The content of the invention
The purpose of the present invention is to overcome that prior art centrifugal blower difficulty of processing is big, processing cost is low, matching requirements are high, whole
The defects of body intensity difference and big noise, there is provided one kind processing is simple, cost is cheap, matching requirements are low, good integral strength, low noise and
Rotating speed and the higher noise elimination high-speed centrifugal fan of efficiency.
To achieve the above object, the present invention is solved by the following technical programs：
A kind of noise elimination high-speed centrifugal fan, including casing, air inlet, blade, front shroud of impeller, back shroud of impeller and electricity
Machine, the back shroud of impeller for it is circular and with the output axis connection of motor, the blade circle distribution is after the impeller on cover plate；
The front shroud of impeller separates with blade, simplifies the structure of prophyll piece integral piece, reduces difficulty of processing, reduces
Processing cost；And due to the reduction of difficulty of processing, available material is more, is added from the more excellent material of intensity
Work, bulk strength can be lifted；
The inside edge of the front shroud of impeller is connected with air inlet, and outer ledge and the cylinder being fixed on air inlet connect
Connect, the front shroud of impeller, air inlet and cylinder form an inwall and gradually increased to both ends for smooth surface and interior centre without leave
Hollow cylinder；
It is cavity between the inwall and outer wall of the hollow cylinder；
It is provided with through hole on the surface of the hollow cylinder and air flow contacts, punching rate >=20%, aperture >=4mm of through hole,
Filling deadener, forms a dissipative muffler, this noise elimination structure is compact, not extra to mounting condition in the cavity
Requirement.
As preferable technical scheme：
A kind of noise elimination high-speed centrifugal fan as described above, the material on the surface of the hollow cylinder and air flow contacts is thickness
Metallic plate of the degree less than 1mm；
The through hole is uniformly distributed on the surface of hollow cylinder and air flow contacts；
The punching rate is 20~30%；
The aperture of the through hole is 4~8mm；
The deadener is mineral wool；
The blade is circular arc type or airfoil type, and circular arc type vane efficiency is general, but processes relatively simple, wing blades
Efficiency is of a relatively high, but processes more complicated；
The distance between the front shroud of impeller two faces relative with blade≤1mm, front shroud of impeller are relative with blade
The distance between two faces be usually to be determined according to machining accuracy, it is the smaller the better in theory, easily cause leaf apart from excessive
Top leakage loss is larger, and experiment shows, distance often increases 1mm, and pressure about reduces by 5%.
A kind of noise elimination high-speed centrifugal fan as described above, the front shroud of impeller are provided around on the face relative with blade
The annular projection of blade, the annular projection can substantially reduce leaf top leakage loss, raised shape be not limited to ring-type or
Before the impeller on cover plate circumference uniform distribution multiple projections, as long as raised position, which can play, reduces the leakage loss effect of leaf top i.e.
Can；
The annular projection is 0mm along itself axial direction and the spacing of blade, before annular projection outer rim just wraps up blade
End, you can to reduce the leakage loss of leaf top, and do not stop that gas flows, the annular projection is along itself radially spacing with blade
For 1~2mm, the spacing set conference to cause certain atmospheric pressure lost, and setting is too small to cause process and assemble difficulty excessive, shadow
Ring yields；
The annular projection, front shroud of impeller, air inlet and cylinder integrally casting shaping are welded with iron plate.
A kind of noise elimination high-speed centrifugal fan as described above, it is fixed with the blade face relative with front shroud of impeller and adds
Qiang Huan, the outer ledge of the reinforcing ring intersect with the outer ledge of blade, wherein, outer ledge refers to apart from motor output shaft
Central axis apart from farthest edge.
A kind of noise elimination high-speed centrifugal fan as described above, the reinforcing ring are laminated structure, the width of the reinforcing ring
For 2~5mm, reinforcement ring width is excessive, can stop that gas flows, the too small then stiffening effect of width is bad；The reinforcing ring, blade
With back shroud of impeller entirety milling.
A kind of noise elimination high-speed centrifugal fan as described above, the edge of the back shroud of impeller and the outer ledge phase of blade
Hand over, the outer ledge of the blade refers to the central axis apart from motor output shaft apart from farthest edge；
Annular diffuser is fixed with the back side panel of the casing, the two surrounds circular groove；
The back shroud of impeller is sunk in the circular groove, and diffuser is fixed on casing back side panel, impeller protecgulum
Plate forms impeller outlet diffuser together with diffuser, and this structure can reduce impeller weight, reduces the rotation of diffuser again
Turn friction loss, reduce impeller due to centrifugal force caused by high speed rotation, strengthen impeller intensity.
A kind of noise elimination high-speed centrifugal fan as described above, the one side of the back shroud of impeller are located in the groove of circular groove
Space, another side flush with the opening surface of circular groove, if do not flush either back shroud of impeller part sink to or impeller after
Cover plate is excessively sunk in circular groove, and vortex, increase loss are easily produced when gas stream is out-of-date；The back shroud of impeller and circle
The distance between the center overlapping of axles of groove, the edge and circular groove inwall of the back shroud of impeller is 1~2mm, the distance
Mainly it is configured according to machining accuracy and assembly precision, distance set conference to cause certain atmospheric pressure lost, and distance was set
It is small that larger challenge can be brought to process and assemble.
A kind of noise elimination high-speed centrifugal fan as described above, the back side panel of the casing are bolted to connection in motor
Installing plate on；
The back side panel one side of the casing is covered with muffler plate I, and another side is covered with muffler plate II；
The muffler plate I between back shroud of impeller and the back side panel of casing, around circular groove and with impeller bonnet
Gap between plate be present, muffler plate I mainly absorbs aerodynamic noise in casing；
The muffler plate II is connected with arc muffler plate III, and arc muffler plate III is enclosed on outside motor, muffler plate II and arc
Muffler plate III mainly absorbs noise of motor.
A kind of noise elimination high-speed centrifugal fan as described above, the muffler plate I, muffler plate II and arc muffler plate III it is interior
Portion filling glass cotton, the thickness of filler is identical or different, and the thickness of filler is 10~20mm, and filler thickness can be according to gas
The actual size of moving noise and noise of motor is configured, when noise is larger, it is possible to increase the thickness of filler, the thicker meeting of filler
Cost is influenceed to a certain extent；
The size in the gap is 4~6mm, and the too small of gap setting then requires higher, meeting to the installation accuracy of muffler plate
Production efficiency is influenceed, gap setting is excessive, and equivalent to the covert volume for increasing blower fan, it is convenient to have impact on to a certain extent
Property；
The arc muffler plate III is semi-cylindrical shaped, and semicircular cylinder here can be that the plane of cylinder center axis will circle
Cylinder be divided into the semicircular cylinder that is formed after two halves or only cylinder center axis by cylinder it is non-be divided into formed after two halves half
Cylinder, the rectangular aperture face of the semicircular cylinder and the central shaft of motor are in the same plane, the rectangular aperture of the semicircular cylinder
The central shaft of face and semicircular cylinder is in the same plane, and the relative position of semicircular cylinder and motor is arranged such and not only improves installation
It is also beneficial to eliminate noise；
The muffler plate II is attached with arc muffler plate III by way of welding.
A kind of noise elimination high-speed centrifugal fan as described above, rotating speed >=6500rpm of noise elimination high-speed centrifugal fan, eliminate the noise high
Efficiency >=70% of fast centrifugal blower.
Invention mechanism：
The present invention realizes front shroud of impeller by the way that air inlet, impeller cover and cylinder integration are processed into hollow cylinder
Separated with blade, while the through hole that size is larger and punching rate is higher is opened up on the surface of hollow cylinder and air flow contacts, and
Filling deadener, which achieves, in the cavity of through hole connection preferably reduces noise, improves the effect of fan efficiency and blower pressure
Fruit.First, size is larger and punching rate is higher through hole is opened up on the surface of hollow cylinder and air flow contacts (perforated plate) simultaneously
Filling deadener forms a dissipative muffler in the cavity of through hole connection, and noise is absorbed during airflow passes hollow cylinder
Weaken, can effectively reduce noise, perforated plate and below cavity form an acoustic resonator, and it has an intrinsic frequency, when frequency of sound wave and
When the resonant frequency is consistent, resonate, the acoustic vibration in system produces strong amplification, and cavity is interior if there is appropriate noise elimination material
Material, then sound energy consumption that can be strong reach good soundproof effect, noise is a kind of sound wave, and sound wave is propagated in deadener
When, dissipated because acoustic energy is converted into heat energy by friction, play the purpose of noise elimination；Secondly, front shroud of impeller and blade are passed through
Separation, reduces air inlet component, can play a part of anti-vortex ring again, after gas outflow impeller enters spiral case, along spiral case
Diffusion, which slows down, to be flowed, and is improved flow field dynamics, is reduced vortex, reduces large scale whirlpool in casing, improves blower fan effect
Rate, overcomes existing for prior art that area of space is larger between front shroud of impeller and case front, meeting after gas outflow impeller
Vortex is produced in this space, causes energy loss, the problem of reducing fan efficiency；Finally, front shroud of impeller and blade are passed through
Separation so that stress greatly reduces suffered by blower fan, and rotation speed of fan can bring up to more than 6500rpm, can effectively improve blower fan
Pressure.In addition, the present invention is also by the way that diffuser is fixed on casing back side panel so that front shroud of impeller group together with diffuser
The circlewise impeller outlet diffuser of flow passage structure, increases runner circulation area, plays a part of deceleration diffusion, and the structure is
Impeller weight can be reduced, further through stationary diffuser, the spin friction loss of diffuser is reduced, reduces impeller because high speed is revolved
Centrifugal force caused by turning, strengthen impeller intensity.The front shroud of impeller upper end of the present invention is provided with an annular projection, it is possible to reduce leaf top
Leakage loss.The present invention can reduce pneumatically making an uproar in volute of blower by installing deadener before and after the back side panel of casing
Sound simultaneously absorbs noise of motor, and more preferable soundproof effect is obtained with dissipative muffler mutual cooperation.
Beneficial effect：
(1) a kind of noise elimination high-speed centrifugal fan of the invention, blade is separated with front shroud of impeller, significantly reduces processing
Difficulty and processing cost, blade and back shroud of impeller are integrally machined shaping, and stress suffered by blower fan, which greatly reduces, can meet blower fan height
The requirement of rotating speed, improves blower pressure；
(2) a kind of noise elimination high-speed centrifugal fan of the invention, through hole is provided with the surface of hollow cylinder and air flow contacts,
And deadener is filled in hollow cylinder cavity, a dissipative muffler is formed, can effectively reduce noise；
(3) a kind of noise elimination high-speed centrifugal fan of the invention, diffuser is fixed on casing back side panel, its with before impeller
Cover plate form impeller outlet diffuser, you can to reduce impeller weight, again reduce diffuser spin friction loss and impeller by
In centrifugal force caused by high speed rotation, impeller intensity is significantly enhanced；
(4) a kind of noise elimination high-speed centrifugal fan of the invention, front shroud of impeller, air inlet and cylinder are integrally machined shaping,
Both air inlet component had been reduced, and it can play a part of anti-vortex ring again, reduce large scale whirlpool in casing, improve blower fan effect
Rate, reduce fan noise；
(5) a kind of noise elimination high-speed centrifugal fan of the invention, by installing muffler plate additional inside and outside casing, both reduces casing
Interior aerodynamic noise, the electromagnetic noise of motor is reduced again, overall noise reduction is obvious, and the design and installation of arc muffler plate
It is convenient；
(6) a kind of noise elimination high-speed centrifugal fan of the invention, have simple processing, low processing cost, matching requirements it is low,
Excellent noise reduction effect and good integral strength can meet high-revolving the characteristics of requiring.
Brief description of the drawings
Fig. 1 is the structural representation of the centrifugal blower of prior art；
Fig. 2 is a kind of structural representation of noise elimination high-speed centrifugal fan of the present invention；
Fig. 3 is the partial enlarged drawing of A in Fig. 2；
Fig. 4 is the schematic diagram of the hollow cylinder of front shroud of impeller, air inlet and the cylinder composition of the present invention；
Fig. 5 is a kind of possible structural representation of noise elimination high-speed centrifugal fan of the present invention；
Fig. 6 is the partial enlarged drawing of A in Fig. 5；
Fig. 7 is the partial enlarged drawing of B in Fig. 5；
Wherein, 1- casings, 2- air inlets, 3- blades, 4- motors, 5- front shroud of impeller, 6- back shroud of impeller, 7- through holes,
8- reinforcing rings, 9- diffusers, 10- muffler plates I, 11- muffler plate II, 12- arc muffler plate III, 13- deadener, 14- circles
Cylinder, 15- annular projections.
Embodiment
The invention will be further elucidated with reference to specific embodiments.It should be understood that these embodiments are merely to illustrate this hair
Bright rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, art technology
Personnel can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Fixed scope.
Embodiment 1
A kind of noise elimination high-speed centrifugal fan, as shown in Fig. 2 including casing 1, air inlet 2, blade 3, front shroud of impeller 5, leaf
Take turns back shroud 6 and motor 7.
Casing 1 is the cored screw shape unsymmetric structure of a bottom surface opening, and the back side panel of casing 1 is that not opening face passes through spiral shell
Bolt is fixedly connected on the installing plate of motor 4, and aperture position correspondingly bores arc air inlet 2, air inlet 2 and annular impeller front shroud
5 connections, front shroud of impeller 5 are completely covered the impeller that blade 3 is formed, impeller diameter 250mm, and blade 3 is circular arc, impeller
Front shroud 5 and blade 3 are that the distance between isolating construction, two faces relative with blade 3 of front shroud of impeller 5 is 1mm, before impeller
The annular projection 15 of blade is provided around on the cover plate face relative with blade, annular projection 15 is vertically with the spacing of blade
0mm, annular projection 15 are radially 1mm with the spacing of blade, and the inside edge of front shroud of impeller 5 is connected with air inlet 2, outside
Edge is connected with the cylinder 14 being fixed on air inlet 2, and it is smooth that front shroud of impeller 5, air inlet 2 and cylinder 14, which form an inwall,
Curved surface and it is interior without leave among the hollow cylinder that gradually increases to both ends as shown in figure 4, being between the inwall and outer wall of hollow cylinder
Cavity, it is filled with mineral wool, as shown in figure 3, being evenly distributed with through hole on the surface of hollow cylinder and air flow contacts, perforate
Rate is 20%, and the aperture of through hole is 4mm, and the material on the surface of hollow cylinder and air flow contacts is the metallic plate that thickness is 0.9mm；
The opposite side of blade 3 is disposed with back shroud of impeller 6, and the center of back shroud of impeller 6 is provided with the output axis connection of through hole and motor 4.
The 6 overall milling of blade 3 and back shroud of impeller, annular projection 15, front shroud of impeller 5, air inlet 2 and the one of cylinder 14
Casting, the back side panel of casing 1 are bolted to connection on the installing plate of motor 4.
The rotating speed of the noise elimination high-speed centrifugal fan is 8200rpm, efficiency 75.2%.Empirical tests, noise elimination of the invention are high
Fast centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, assembling
It is it is required that low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 2
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 1, difference be its before the impeller cover plate with
The annular projection of blade is not surround on the relative face of blade, front shroud of impeller, air inlet and cylinder are welded with iron plate, before impeller
The distance between cover plate two faces relative with blade are 0.9mm, and blade is airfoil type, plate thickness 0.95mm, is perforated
Rate is 30%, and the aperture of through hole is 6mm.
The rotating speed of the noise elimination high-speed centrifugal fan is 7000rpm, efficiency 75%.Empirical tests, noise elimination of the invention is at a high speed
Centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, and assembling will
Ask low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 3
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 2, and difference is it before blade and impeller
Sheet reinforcing ring is fixed with the relative face of cover plate, the outer ledge of reinforcing ring intersects with the outer ledge of blade, wherein outside
Edge refers to central axis apart from motor output shaft apart from farthest edge, and the width of reinforcing ring is 5mm, reinforcing ring, blade
With back shroud of impeller entirety milling, the distance between front shroud of impeller two faces relative with blade are 0.8mm, plate thickness
For 0.85mm, punching rate 25%, the aperture of through hole is 7mm.
The rotating speed of the noise elimination high-speed centrifugal fan is 7500rpm, efficiency 72.5%.Empirical tests, noise elimination of the invention are high
Fast centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, assembling
It is it is required that low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 4
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 1, and difference is it before blade and impeller
Sheet reinforcing ring is fixed with the relative face of cover plate, the outer ledge of reinforcing ring intersects with the outer ledge of blade, wherein outside
Edge refers to central axis apart from motor output shaft apart from farthest edge, and the width of reinforcing ring is 2mm, reinforcing ring, blade
With back shroud of impeller entirety milling, annular projection is radially 2mm with the spacing of blade, and the punching rate of metallic plate is 24%, is led to
The aperture in hole is 8mm.
The rotating speed of the noise elimination high-speed centrifugal fan is 7600rpm, efficiency 73.2%.Empirical tests, noise elimination of the invention are high
Fast centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, assembling
It is it is required that low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 5
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 3, and difference is that the width of reinforcing ring is
3.5mm；Intersect with the outer ledge of blade at the edge of back shroud of impeller；It is fixed with annular diffuser on the back side panel of casing, two
Person surrounds circular groove, and the one side of back shroud of impeller is located at the opening in space in the groove of circular groove, another side and circular groove
Face flushes, the center overlapping of axles of back shroud of impeller and circular groove, between the edge and circular groove inwall of back shroud of impeller
Distance is 1mm.
The rotating speed of the noise elimination high-speed centrifugal fan is 7800rpm, efficiency 73%.Empirical tests, noise elimination of the invention is at a high speed
Centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, and assembling will
Ask low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 6
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 5, and difference is that the width of reinforcing ring is
4mm；The distance between edge and circular groove inwall of back shroud of impeller are 2mm；Cover plate is relative with blade before the impeller for it
Be provided around the annular projection of blade on face, annular projection is 0mm with the spacing of blade vertically, annular projection radially with leaf
The spacing of piece is 1.5mm, annular projection, front shroud of impeller, air inlet and cylinder integrally casting shaping.
The rotating speed of the noise elimination high-speed centrifugal fan is 6800rpm, efficiency 72.8%.Empirical tests, noise elimination of the invention are high
Fast centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, assembling
It is it is required that low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 7
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 5, and difference is the edge of back shroud of impeller
The distance between circular groove inwall is 1.5mm；The two-sided back side panel of casing covered with muffler plate is muffler plate I and muffler plate
II, wherein muffler plate I are between back shroud of impeller and the back side panel of casing, in annular shape, internal filling glass cotton, and filler
Thickness be 20mm, its gap between back shroud of impeller is 4mm, and back side panel of casing is completely covered for it；Muffler plate II
On the outside of casing, in annular shape, internal filling glass cotton, the thickness of filler is 10mm, and its part covers the rear side of casing
Plate, the opposite side of muffler plate II are welded with arc muffler plate III, and arc muffler plate III is the semi-cylindrical shaped of rectangular surfaces opening, positioned at electricity
The surface of machine, internal filling glass cotton, the thickness of filler are 20mm, its rectangular aperture face and semicircular cylinder central shaft, electricity
The central shaft of machine is respectively positioned in same level.
The rotating speed of the noise elimination high-speed centrifugal fan is 6500rpm, efficiency 70%.Empirical tests, noise elimination of the invention is at a high speed
Centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, and assembling will
Ask low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 8
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 7 as shown in Fig. 5,6 and 7, and difference is
The distance between edge and circular groove inwall of back shroud of impeller are 1.8mm；Its cover plate face relative with blade before the impeller
On be provided around the annular projection of blade, annular projection is 0mm with the spacing of blade vertically, annular projection radially with blade
Spacing be 1.2mm, annular projection, front shroud of impeller, air inlet and cylinder integrally casting shaping；Muffler plate I and impeller bonnet
Gap between plate is 6mm, and the thickness of muffler plate I inner stuffings is 10mm, and the thickness of muffler plate II inner stuffings is 20mm, is disappeared
The thickness of sound plate III inner stuffings is 10mm.
The rotating speed of the noise elimination high-speed centrifugal fan is 6800rpm, efficiency 70%.Empirical tests, noise elimination of the invention is at a high speed
Centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, and assembling will
Ask low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 9
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 2, and difference is that the back side panel of casing is two-sided
Be muffler plate I and muffler plate II covered with muffler plate, wherein muffler plate I between back shroud of impeller and the back side panel of casing,
In annular shape, internal filling glass cotton, the thickness of filler is 16mm, and its gap between back shroud of impeller is 5mm, and it will
The back side panel of casing is completely covered；Muffler plate II is located on the outside of casing, in annular shape, internal filling glass cotton, and the thickness of filler
Spend and cover the back side panel of casing for 15mm, its part, the opposite side of muffler plate II is welded with arc muffler plate III, arc muffler plate III
For the semi-cylindrical shaped of rectangular surfaces opening, positioned at the surface of motor, internal filling glass cotton, the thickness of filler is 15mm, its
The central shaft of rectangular aperture face and semicircular cylinder, the central shaft of motor are respectively positioned in same level.
The rotating speed of the noise elimination high-speed centrifugal fan is 7200rpm, efficiency 70.5%.Empirical tests, noise elimination of the invention are high
Fast centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, assembling
It is it is required that low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 10
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 2, and difference is on the back side panel of casing solid
Surely there is annular diffuser, the two surrounds circular groove, and the one side of back shroud of impeller is located at space in the groove of circular groove, another side
Flushed with the opening surface of circular groove, the center overlapping of axles of back shroud of impeller and circular groove, the edge and circle of back shroud of impeller
The distance between connected in star inwall is 1.4mm.
The rotating speed of the noise elimination high-speed centrifugal fan is 6500rpm, efficiency 76%.Empirical tests, noise elimination of the invention is at a high speed
Centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, and assembling will
Ask low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 11
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 9, and difference is on the back side panel of casing solid
Surely there is annular diffuser, the two surrounds circular groove, and the one side of back shroud of impeller is located at space in the groove of circular groove, another side
Flushed with the opening surface of circular groove, the center overlapping of axles of back shroud of impeller and circular groove, the edge and circle of back shroud of impeller
The distance between connected in star inwall is 1.8mm；Gap between muffler plate I and back shroud of impeller is 4.5mm, is filled out in muffler plate I
The thickness for filling thing is 15mm, and the thickness of muffler plate II inner stuffings is 18mm, and the thickness of muffler plate III inner stuffings is 14mm.
The rotating speed of the noise elimination high-speed centrifugal fan is 6900rpm, efficiency 71%.Empirical tests, noise elimination of the invention is at a high speed
Centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, and assembling will
Ask low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Embodiment 12
A kind of noise elimination high-speed centrifugal fan, its structure is substantially the same manner as Example 11, and difference is its cover plate before the impeller
The annular projection of blade is provided around on the face relative with blade, annular projection is vertically 0mm with the spacing of blade, and ring-type is convex
It is radially 1.7mm with the spacing of blade to rise, annular projection, front shroud of impeller, air inlet and cylinder integrally casting shaping.
The rotating speed of the noise elimination high-speed centrifugal fan is 7000rpm, efficiency 71.5%.Empirical tests, noise elimination of the invention are high
Fast centrifugal blower difficulty of processing is low, low processing cost, and bulk strength high energy meets high-revolving requirement, reasonable in design, assembling
It is it is required that low；It is obvious and simple in construction compared to conventional centrifugal blower fan noise reduction, it is easy to assembly.
Claims (10)
1. a kind of noise elimination high-speed centrifugal fan, including casing, air inlet, blade, front shroud of impeller, back shroud of impeller and motor,
The back shroud of impeller for it is circular and with the output axis connection of motor, for the blade circle distribution after the impeller on cover plate, it is special
Sign is：
The front shroud of impeller separates with blade；
The inside edge of the front shroud of impeller is connected with air inlet, and outer ledge is connected with the cylinder being fixed on air inlet,
It is smooth surface and the interior sky gradually increased to both ends middle without leave that the front shroud of impeller, air inlet and cylinder, which form an inwall,
Heart cylinder；
It is cavity between the inwall and outer wall of the hollow cylinder；
It is provided with through hole on the surface of the hollow cylinder and air flow contacts, punching rate >=20%, aperture >=4mm of through hole is described
Filling deadener in cavity.
2. a kind of noise elimination high-speed centrifugal fan according to claim 1, it is characterised in that the hollow cylinder connects with air-flow
The material on tactile surface is the metallic plate that thickness is less than 1mm；
The through hole is uniformly distributed on the surface of hollow cylinder and air flow contacts；
The punching rate is 20~30%；
The aperture of the through hole is 4~8mm；
The deadener is mineral wool；
The blade is circular arc type or airfoil type；
The distance between the front shroud of impeller two faces relative with blade≤1mm.
3. a kind of noise elimination high-speed centrifugal fan according to claim 2, it is characterised in that the front shroud of impeller and blade
The annular projection of blade is provided around on relative face；
The annular projection is 0mm with the spacing of blade vertically, the annular projection radially with the spacing of blade for 1~
2mm；
The annular projection, front shroud of impeller, air inlet and cylinder integrally casting shaping are welded with iron plate.
4. a kind of noise elimination high-speed centrifugal fan according to claim 2, it is characterised in that the blade and front shroud of impeller
Reinforcing ring is fixed with relative face, the outer ledge of the reinforcing ring intersects with the outer ledge of blade, wherein, outer ledge
Refer to the central axis apart from motor output shaft apart from farthest edge.
5. a kind of noise elimination high-speed centrifugal fan according to claim 4, it is characterised in that the reinforcing ring is sheet knot
Structure, the width of the reinforcing ring is 2~5mm；The reinforcing ring, blade and back shroud of impeller entirety milling.
A kind of 6. noise elimination high-speed centrifugal fan according to claim 1, it is characterised in that the edge of the back shroud of impeller
Intersect with the outer ledge of blade, the outer ledge of the blade refers to that central axis distance apart from motor output shaft is farthest
Edge；
Annular diffuser is fixed with the back side panel of the casing, the two surrounds circular groove；
The back shroud of impeller is sunk in the circular groove.
A kind of 7. noise elimination high-speed centrifugal fan according to claim 6, it is characterised in that the one side of the back shroud of impeller
The space in the groove of circular groove, another side flush with the opening surface of circular groove；The back shroud of impeller and circular groove
The distance between center overlapping of axles, the edge and circular groove inwall of the back shroud of impeller be 1~2mm.
8. a kind of noise elimination high-speed centrifugal fan according to claim 1, it is characterised in that the back side panel of the casing passes through
Bolt is fixedly connected on the installing plate of motor；
The back side panel one side of the casing is covered with muffler plate I, and another side is covered with muffler plate II；
The muffler plate I between back shroud of impeller and the back side panel of casing, around circular groove and with back shroud of impeller it
Between gap be present；
The muffler plate II is connected with arc muffler plate III, and arc muffler plate III is enclosed on outside motor.
9. a kind of noise elimination high-speed centrifugal fan according to claim 8, it is characterised in that the muffler plate I, muffler plate II
With the inside filling glass cotton of arc muffler plate III, the thickness of filler is identical or different, and the thickness of filler is 10~20mm；
The size in the gap is 4~6mm；
The arc muffler plate III is semi-cylindrical shaped, the rectangular aperture face of the semicircular cylinder and the central shaft of motor positioned at same
In plane, the rectangular aperture face of the semicircular cylinder and the central shaft of semicircular cylinder are in the same plane；
The muffler plate II is attached with arc muffler plate III by way of welding.
A kind of 10. noise elimination high-speed centrifugal fan according to any one of claim 1~9, it is characterised in that eliminate the noise at a high speed from
Rotating speed >=6500rpm of heart blower fan, efficiency >=70% of noise elimination high-speed centrifugal fan.
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| CN110864005A (en) * | 2019-12-27 | 2020-03-06 | 温州盛淼工业设计有限公司 | Centrifugal fan impeller |
| CN111379724A (en) * | 2018-12-29 | 2020-07-07 | 华为技术有限公司 | Fan assembly and communication equipment |
| CN113357191A (en) * | 2021-06-30 | 2021-09-07 | 南京风机厂有限公司 | Manufacturing process of centrifugal fan with noise reduction structure at air outlet |
| CN114738317A (en) * | 2022-05-10 | 2022-07-12 | 浙江尚扬通风设备有限公司 | Low-loss impeller assembly for centrifugal fan and fan with same |
| CN114962323A (en) * | 2022-06-10 | 2022-08-30 | 合肥通用机械研究院有限公司 | Low-vibration low-noise centrifugal fan adopting gas bearing |
| CN115853829A (en) * | 2022-12-27 | 2023-03-28 | 西安交通大学 | Fan collector and centrifugal fan |
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