CN116292340B - Multi-wing centrifugal fan - Google Patents
Multi-wing centrifugal fan Download PDFInfo
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- CN116292340B CN116292340B CN202310524413.9A CN202310524413A CN116292340B CN 116292340 B CN116292340 B CN 116292340B CN 202310524413 A CN202310524413 A CN 202310524413A CN 116292340 B CN116292340 B CN 116292340B
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- 239000002184 metal Substances 0.000 claims abstract description 4
- 230000007704 transition Effects 0.000 claims description 22
- 238000009434 installation Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims 3
- 238000013461 design Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 6
- 230000000670 limiting effect Effects 0.000 description 3
- 239000011664 nicotinic acid Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification 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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—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
- F04D29/422—Discharge tongues
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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
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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
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to the field of centrifugal fans, and particularly discloses a multi-wing centrifugal fan which comprises a volute and an impeller arranged in the volute, wherein the impeller is provided with a positioning disk, a plurality of blades are arranged on the positioning disk in a surrounding array, the blades are of a forward single-arc structure extending along the axial direction of the positioning disk, an air inlet angle of 90-110 degrees when the blades are installed, an air outlet angle of 2 is 160-180 degrees when the blades are installed, a central angle of arc line of the cross section of the blades is 60-90 degrees, the blades are sheet metal blades, the blades comprise a front edge and a tail edge, the tail edge is of a zigzag structure, the sawteeth are standard symmetrical triangular sawteeth, the front edge is of a waveform structure with a sine-shaped curve, and inclined parts inclining towards the front of the blades along the back of the blades are arranged at the protrusions of the waveform structure. The multi-wing centrifugal fan can improve gap flow and blade root stacking flow of the front edge, reduce flow loss, improve effective flow range and efficiency and reduce noise.
Description
Technical Field
The invention relates to the field of centrifugal fans, in particular to a multi-wing centrifugal fan.
Background
In order to improve the performance of the multi-wing centrifugal fan and ensure the stability of the designed multi-wing centrifugal fan, a great deal of tests are usually required to be carried out, and researches show that: the CFD analysis is carried out in the product design process, a designer can not only obtain the internal flow condition of the product, but also predict the overall performance of the product, and timely adjust the design scheme, and a research and development team at home and abroad sequentially provides designs of forward bending blade center angles delta more than or equal to 90 degrees, 90 degrees or less, flow channel acceleration, constant speed and the like under the assistance of numerical simulation (Computational Fluid Dynamics, CFD), experiments and the like, so that the improvement of various novel ideas such as the outlet angle of the volute, the width of the volute and the like is changed, and the performance of the multi-wing centrifugal fan is greatly improved. However, in theoretical design and analysis, the improvement modes such as bionic design of blades, relative installation modes among impeller parts and the like are ignored under the condition, so that the problems of low flow and high noise of the existing multi-wing centrifugal fan still exist, and the performance needs to be further optimized.
Disclosure of Invention
The invention aims to provide a multi-wing centrifugal fan, which aims to solve the problems of low flow and large noise in the prior art.
In order to achieve the aim, the invention provides a multi-wing centrifugal fan, which comprises a volute and an impeller arranged in the volute, wherein the impeller is provided with a positioning disk, a plurality of blades are arranged on the positioning disk in a surrounding array, the blades are of a forward single-arc structure extending along the axial direction parallel to the positioning disk, an air inlet angle of 90-110 DEG when the blades are installed, an air outlet angle of 160-180 DEG when the blades are installed, a central angle of arc line of the cross section of the blades is 60-90 DEG, the blades are sheet metal blades, the blades comprise a front edge and a tail edge, the tail edge are of a zigzag structure, the sawteeth are standard symmetrical triangular sawteeth, the blade length is L1, the tooth width is L2, L1:L2 is (105-115): 1, the blade width is L3, the tooth height is L4, L3:L4 is (10-15): 1, the blade thickness is h, and L1:3:h is (5-7): 1 (0.02-0.05); the front edge is set to be a waveform structure with a sine curve, the waveform structure comprises a plurality of sections of waveform arcs, the maximum disturbance angle of the waveform structure is plus or minus (20-30) °, the central angle of the arc on the front edge is 40-50 degrees, the wavelength is lambda, lambda is L1 (5-10), the amplitude is A, A is L3 (1) (10-15), the convex part of the waveform structure is provided with an inclined part which is inclined towards the front surface of the blade along the back surface of the blade, and the inclined angle is 30-60 degrees.
Preferably, the air inlet angle 1 during blade installation is 100 degrees, the air outlet angle 2 during blade installation is 170 degrees, the central angle 3 of an arc of the cross section of the blade is 74 degrees, L1:L2 is 108:1, L3:L4 is 12.5:1, L1:3:h is 6:1:0.037, the maximum disturbance angle 4 of the wave structure is +/-22 degrees, the maximum disturbance angle of the circular arc on the front edge when the circular arc on the front edge is concave towards the direction of the tail edge is positive, the maximum disturbance angle of the circular arc on the front edge when the circular arc on the front edge is convex away from the direction of the tail edge is negative, the central angle 5 of the circular arc on the front edge is 45 degrees, lambda:L 1 is 1:8, A:L3 is 1:13.7, and the inclination angle of the inclined part is 60 degrees.
Preferably, be provided with the wind channel that widens gradually along impeller direction of rotation in the spiral case, be provided with air intake, air outlet on the spiral case, air intake department is provided with the mass collector, mass collector and impeller clearance fit, and the mass collector sets up to circular arc transition formula structure, the impeller still includes solid fixed ring, blade butt is between positioning disk, gu fixed ring, the mass collector includes the changeover portion, the changeover portion cross-section is circular arc formula structure, the changeover portion extends along being on a parallel with the axial direction of mass collector from the minimum diameter department of changeover portion, the diameter of changeover portion is less than the circular shape diameter that comprises the air inlet end of a plurality of blades, be provided with the clearance between the terminal surface of the one end face of changeover portion orientation impeller and the terminal surface of solid fixed ring orientation mass collector one end in the horizontal direction, make mass collector and impeller along vertical direction, all there is the clearance in the horizontal direction.
Preferably, the diameter of the transition section gradually expands along the direction away from the impeller, the central angle 6 of the transition section is 80-100 degrees, the maximum chord length of the transition section is X1, the length of the extension section is X2, and the X1:X2 is 1 (0.1-0.4).
Preferably, the central angle 6 of the transition section is 90 degrees, and X1 and X2 are 1:0.28.
Preferably, a diffuser section is arranged at the position of the volute towards the air outlet, the air outlet is positioned at one side of the top of the volute, a volute tongue of the volute is positioned at the end face of the bottom of the inner wall of the diffuser section and protrudes upwards, the height of the volute is H1, the height of the air outlet is H2, the height of the volute tongue is H3, and the ratio of H1 to H2 to H3 is (2-3): 1 (0.1-0.3).
Preferably, H1, H2 and H3 are 2.5:1:0.2.
Preferably, the tail end of the volute tongue is of an arc-shaped structure bent towards the air outlet, the central angle 7 of the volute tongue is 110-130 degrees, the radius of the volute tongue is set as R, and the R: H3 is 1 (2-5).
Preferably, the central angle 7 of the volute tongue is 120 degrees, and R: H3 is 1:3.7.
Preferably, positioning disk, blade, solid fixed ring on the impeller are respectively including two sets of, the impeller is provided with the biax motor, this two sets of positioning disk all are connected with biax motor linkage, the air intake runs through both sides around the spiral case, the impeller is all along its radial axis symmetric distribution, the axis of these three of biax motor, the air intake, the air current collector is mutual coincidence, the air intake department that lies in both sides around on the spiral case all is provided with the mounting bracket, biax motor supports the top and installs between these two sets of mounting brackets, and the axis of biax motor and mounting bracket axis coincide each other, the mounting bracket includes central mounting, with central mounting fixed part fixed connection's support, the support includes the wind-guiding section, the bending section, the installation section is connected fixedly along the radial direction of spiral case with central mounting, the installation section is connected fixedly with the current collector.
According to the multi-wing centrifugal fan provided by the invention, through bionic design of the shape of the blade, optimization design of the installation inclination angle of the blade and the like, the front edge clearance flow and the blade root stacking flow can be effectively improved, the flow loss is reduced, the effective flow range and the efficiency of the multi-wing centrifugal fan can be further effectively improved, the vortex condition of the inner airflow of the multi-wing centrifugal fan can be improved, the disturbance of vortex separation on the airflow is restrained, the noise is reduced, the performance of the multi-wing centrifugal fan is better, and the practicability is stronger.
Drawings
FIG. 1 is a schematic perspective view of a multi-wing centrifugal fan according to the present invention;
FIG. 2 is a schematic diagram of an explosive structure according to the present invention;
FIG. 3 is a schematic view of the cross-sectional profile and partial enlarged structure of the impeller of the present invention
FIG. 4 is a schematic perspective view of a blade according to the present invention;
FIG. 5 is a schematic top view of a blade according to the present invention;
FIG. 6 is a schematic cross-sectional view of a blade of the present invention;
fig. 7 is a schematic side view of a current collector of the present invention;
FIG. 8 is a schematic view of a partial cross-sectional structure of the present invention;
FIG. 9 is a graph of performance plotted under test data from comparative examples;
FIG. 10 is a graph of performance plotted under test data from the present invention.
Reference numerals illustrate: 1. an impeller; 11. a positioning plate; 12. a blade; 121. a leading edge; 1211. an inclined portion; 122. a trailing edge; 13. a fixing ring; 14. a biaxial motor; 15. a mounting frame; 151. a center fixing member; 152. a bracket; 1521. an air guide section; 1522. a curved section; 1523. a mounting section; 2. a volute; 21. an air duct; 22. an air inlet; 23. an air outlet; 231. a diffuser section; 232. a volute tongue; 24. a current collector; 241. a transition section; 242. an extension.
Detailed Description
The present invention will be described in detail with reference to specific examples.
In the present invention, unless explicitly stated and limited otherwise, when terminology such as "disposed," "connected," or "connected" is intended to be interpreted broadly, such as, for example, a fixed connection, a removable connection, or an integral connection; may be directly connected or connected through one or more intermediaries. The specific meaning of the terms described above in the present invention can be understood by those skilled in the art according to the specific circumstances. The direction words appearing in the invention are used for better explaining the characteristics of the features and the relation among the features, and it is understood that when the arrangement direction of the invention is changed, the characteristics of the features and the directions of the relation among the features are correspondingly changed, so that the direction words do not form absolute limiting effect on the characteristics of the features and the relation among the features in space, and only play a role in relative limiting.
Referring to fig. 1-10, the present invention provides a multi-wing centrifugal fan technical scheme: the impeller comprises a volute 2 and an impeller 1 arranged in the volute 2, wherein the impeller 1 is provided with a positioning disk 11, a plurality of blades 12 are arranged on the positioning disk 11 in a surrounding array, each blade 12 is of a forward single-arc structure extending along the axial direction parallel to the positioning disk 11, an air inlet angle 1 of the blades 12 during installation is 90-110 degrees, an air outlet angle 2 of the blades 12 during installation is 160-180 degrees, a central angle 3 of an arc of the cross section of each blade 12 is 60-90 degrees, and each blade 12 is a sheet metal blade. Blade 12 includes leading edge 121, trailing edge 122 is configured as a zigzag structure, the zigzag is a standard symmetrical triangular zigzag, blade 12 length is L1, tooth width is L2, L1:L2 is (105-115): 1, blade 12 width is L3, tooth height is L4, L3:L4 is (10-15): 1, blade 12 thickness is h, L1:L3:h is (5-7): 1 (0.02-0.05).
The front edge 121 is provided with a waveform structure with a sine curve, and comprises a plurality of sections of waveform arcs, the maximum disturbance angle of the waveform structure is +.4 (20-30) °, the central angle of the arc on the front edge 121 is 40-50 °, the wavelength is lambda, lambda: L1 is 1 (5-10), the amplitude is A, A: L3 is 1 (10-15), the convex part of the waveform structure is provided with an inclined part 1211 which is inclined along the back surface of the blade 12 towards the front surface of the blade 12, and the inclined angle is 30-60 °.
Preferably, the inlet air angle +.1 when the blade 12 is installed is 100 °, the outlet air angle +.2 when the blade 12 is installed is 170 °, the central angle +.3 of the arc of the cross section of the blade 12 is 74 °, L1:L2 is 108:1, L3:L4 is 12.5:1, L1:3:h is 6:1:0.037, the maximum disturbance angle +.4 of the wave structure is + -22 °, the maximum disturbance angle of the arc on the leading edge 121 when the arc is concave towards the trailing edge 122 is positive, the maximum disturbance angle of the arc on the leading edge 121 when the arc is convex away from the trailing edge 122 is negative, the central angle +.5 of the arc on the leading edge 121 is 45 °, lambda:L 1 is 1:8, A:L3 is 1:13.7, and the inclination angle of the inclined part 1211 is 60 °. The structural arrangement under the above parameters was tested to achieve the best performance.
Through above-mentioned technical scheme, through carrying out bionic design to the blade shape to carry out optimal design to blade installation inclination etc. can effectively improve leading edge 121 clearance flow and blade root and pile up the flow, reduce flow loss, and then can effectively improve the effective flow scope and the efficiency of this multi-wing centrifugal fan, and can improve the vortex situation of this multi-wing centrifugal fan internal air current, restrained vortex break away from the disturbance to the air current, thereby reduce noise, make this multi-wing centrifugal fan's performance better, the practicality is stronger.
In this embodiment, an air duct 21 gradually widening along the rotation direction of the impeller 1 is disposed in the volute 2, an air inlet 22 and an air outlet 23 are disposed on the volute 2, a current collector 24 is disposed at the air inlet 22, the current collector 24 is in clearance fit with the impeller 1, the current collector 24 is in a circular arc transition structure, the impeller 1 further includes a fixing ring 13, the blades 12 are abutted between the positioning plate 11 and the fixing ring 13, the current collector 24 includes a transition section 241 and an extension section 242, the cross section of the transition section 241 is in a circular arc structure, the extension section 242 extends from the minimum diameter of the transition section 241 along an axial direction parallel to the current collector 24 toward the impeller 1, the diameter of the extension section 242 is smaller than the diameter of a circle formed by the air inlet ends of the blades, and a gap is disposed between an end face of the extension section 242 facing the impeller 1 and an end face of the fixing ring 13 facing the current collector 24 in the horizontal direction, so that the current collector 24 and the impeller 1 have gaps along the vertical direction and the horizontal direction.
In this embodiment, the diameter of the transition section 241 gradually expands along the direction away from the impeller 1, the central angle 6 of the transition section 241 is 80-100 °, the maximum chord length of the transition section 241 is X1, the length of the extension section 242 is X2, and X1: X2 is 1 (0.1-0.4). Preferably, the central angle 6 of the transition section 241 is 90 degrees, and X1 and X2 are 1:0.28.
In this embodiment, by optimizing the shape of the collector 24 and the gap between the collector 24 and the impeller 1, the loss caused by the mutual impact of the air flows in the multi-wing centrifugal fan can be effectively reduced, so that the energy efficiency of the multi-wing centrifugal fan is improved, and by enabling the collector 24 to be more matched with the impeller 1, the flow of the multi-wing centrifugal fan is increased, the power consumption is reduced, and the noise is reduced.
In this embodiment, a diffuser 231 is disposed at the position of the volute 2 facing the air outlet 23, the air outlet 23 is located at one side of the top of the volute 2, a volute tongue 232 of the volute 2 is located at the bottom end face of the inner wall of the diffuser 231 and protrudes upward, the height of the volute 2 is H1, the height of the air outlet 23 is H2, the height of the volute tongue 232 is H3, the ratio of H1 to H2 to H3 is (2-3): 1 (0.1-0.3), the tail end of the volute tongue 232 is provided with an arc-shaped structure bent towards the air outlet 23, the central angle ∈7 is 110-130 °, the radius of the volute tongue is R, and the radius of the volute tongue is R: H3 is 1 (2-5). Preferably, H1, H2 and H3 are 2.5:1:0.2, the central angle 7 of the volute tongue 232 is 120 degrees, and R3 is 1:3.7. In this embodiment, by reasonably adjusting the height of the air outlet 23 and the height of the volute tongue 232, the air speed of the air outlet 23 can be effectively reduced, so that the full-pressure static pressure efficiency of the multi-wing centrifugal fan is higher, and the shape and structure of the volute tongue 232 are optimally designed in this embodiment, so that the noise generated at the air outlet 23 can be reduced.
For verification of this example, a conventional air conditioning fan of model DKT-3.0A was used as a comparative example, which was identical to the impeller diameter and fan model in this example. Meanwhile, based on the preferable structural parameters provided by the embodiment, the multi-wing centrifugal fan is manufactured. The comparative example and the present example were subjected to performance test, the test results were converted into test conditions at an atmospheric pressure of 101325Pa, an atmospheric temperature of 20℃and a medium density of 1.2 kg/m.mu.m, the comparative example gave a performance curve drawn under test data as shown in FIG. 9, the present example gave a performance curve drawn under test data as shown in FIG. 10, the performance curve taking a volume flow as an abscissa, qvsglu as a volume flow, LAGu as an A sound level, ηr as a fan efficiency, prGu as an impeller power, pFGu as a full pressure, psFGu as a static pressure.
From the performance curve, the overall performance trend is that under the condition of increasing the impeller power, the volume flow is increased, the total pressure and the static pressure are slightly increased and then reduced, the sound level A is increased, and the fan efficiency is firstly increased and then reduced; in the process of increasing the impeller power from about 0.7kW to about 3.5kW, the volume flow rate is increased from about 2150 m/h to about 10000 m/h, the total pressure is reduced to about 380Pa after the total pressure is slightly increased from about 560Pa, the static pressure is reduced to about 0Pa after the total pressure is slightly increased from about 540Pa, the A sound level is increased to about 90dB from about 77dB, and the fan efficiency is reduced from about 46% to up to 66% and then to about 31%. For the embodiment, the overall performance trend is that under the condition that the impeller power is improved, the volume flow is improved, the total pressure and the static pressure are slightly increased and then reduced, the sound level A is increased, and the fan efficiency is firstly improved and then reduced; in the process of increasing the impeller power from about 0.6kW to about 3.3kW, the volume flow rate is increased from about 2130 m/h to about 8750 m/h, the total pressure is reduced to about 480Pa after the trace increase from about 640Pa, the static pressure is reduced to about 0Pa after the trace increase from about 620Pa, the A sound level is increased from about 73dB to about 87dB, and the fan efficiency is reduced from about 46% to up to 76% and then to about 31%. In terms of performance parameter comparison, the highest fan efficiency of the comparative example was 66%, whereas the highest fan efficiency of the present example was 76%; meanwhile, the maximum A sound level of the comparative example was 90dB, and the maximum A sound level of the present example was 87dB. In summary, compared with the comparative example, the fan efficiency of the embodiment is improved by 8-10%, and the fan noise is reduced by 3-4 dB.
In this embodiment, the positioning disc 11, the blades 12 and the fixing ring 13 on the impeller 1 respectively comprise two groups, the impeller 1 is provided with the double-shaft motor 14, the two groups of positioning discs 11 are connected with the double-shaft motor 14 in a linkage manner, the air inlet 22 penetrates through the front side and the rear side of the volute 2, the volute 2 and the impeller 1 are symmetrically distributed along the radial central axis of the volute, so that the working efficiency of the multi-wing centrifugal fan is higher, and it is required to be explained that the axes of the double-shaft motor 14, the air inlet 22 and the current collector 24 are mutually overlapped, so that the air flow is uniform when the air is introduced into the left side and the right side of the multi-wing centrifugal fan, and the air flowing effect in the multi-wing centrifugal fan is better.
In this embodiment, the air intake 22 department that is located both sides all is provided with mounting bracket 15 around on the spiral case 2, biax motor 14 supports the top and installs between these two sets of mounting brackets 15, and biax motor 14's axis and mounting bracket 15 axis coincide each other, mounting bracket 15 includes central mounting bracket 151, with central mounting bracket 151 fixed connection's support 152, support bracket 152 includes three sets of, biax motor 14 runs through central mounting bracket 151, support bracket 152 includes wind-guiding section 1521, curved section 1522, installing section 1523, wind-guiding section 1521 is connected fixedly with central mounting bracket 151 along the radial direction of spiral case 2, installing section 1523 is connected fixedly with current collector 24, guarantee biax motor 14 and install stability on this multiaspect centrifugal fan, and the influence that the air flow caused of mounting bracket 15 to air intake 22 department can effectively be reduced to support bracket 152 of this structure.
The above-described embodiments and features of the embodiments may be combined with each other without conflict.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a many wings centrifugal fan, includes spiral case and sets up the impeller in the spiral case, and the impeller is provided with the positioning disk, encircles the array on the positioning disk and has a plurality of blades, its characterized in that: the blade is of a forward single arc structure extending along the axial direction parallel to the positioning disk, the air inlet angle 1 of the blade is 90-110 degrees, the air outlet angle 2 of the blade is 160-180 degrees, the central angle 3 of the arc of the cross section of the blade is 60-90 degrees, the blade is a sheet metal blade, the blade comprises a front edge and a tail edge, the tail edge is of a zigzag structure, the sawteeth are standard symmetrical triangular sawteeth, the length of the blade is L1, the tooth width is L2, L1:L2 is (105-115): 1, the width of the blade is L3, the tooth height is L4, L3:L4 is (10-15): 1, the thickness of the blade is h, and L1:L3:h is (5-7): 1.02-0.05);
the front edge is set to be a sine wave-shaped structure, the wave-shaped structure comprises a plurality of sections of wave-shaped arcs, the maximum disturbance degree included angle 4 of the wave-shaped structure is + -20-30 DEG, the central angle 5 of the arc on the front edge is 40-50 DEG, the wavelength is lambda, lambda is L1 (5-10), the amplitude is A, A is L3 and is 1 (10-15), the convex part of the wave-shaped structure is provided with an inclined part which is inclined towards the front surface of the blade along the back surface of the blade, and the inclined angle is 30-60 deg;
the volute is provided with a diffusion section towards the air outlet, the air outlet is positioned at one side of the top of the volute, the top and the bottom of the inner wall of the diffusion section are parallel to each other, a volute tongue of the volute is positioned at the end face of the bottom of the inner wall of the diffusion section and protrudes upwards, the height of the volute is H1, the height of the air outlet is H2, the height of the volute tongue is H3, and the H1:H2: H2: 1:1 (0.1-0.3); the tail end of the volute tongue is of an arc-shaped structure which is bent towards the air outlet, the central angle < 7 > of the volute tongue is 110-130 degrees, the radius of the volute tongue is set as R, and the R: H3 is 1 (2-5).
2. A multi-wing centrifugal fan according to claim 1, wherein: the air inlet angle 1 during blade installation is 100 degrees, the air outlet angle 2 during blade installation is 170 degrees, the central angle 3 of an arc of a blade cross section is 74 degrees, L1:L2 is 108:1, L3:L4 is 12.5:1, L1:L3:h is 6:1:0.037, the maximum disturbance angle 4 of the wave structure is +/-22 degrees, the maximum disturbance angle of the circular arc on the front edge when the circular arc on the front edge is concave towards the direction of the tail edge is positive, the maximum disturbance angle of the circular arc on the front edge when the circular arc on the front edge is convex away from the direction of the tail edge is negative, the central angle 5 of the circular arc on the front edge is 45 degrees, lambda:L1 is 1:8, A:L3 is 1:13.7, and the inclination angle of the inclination part is 60 degrees.
3. A multi-wing centrifugal fan according to claim 2, wherein: the spiral case is internally provided with an air channel which is gradually widened along the rotation direction of the impeller, the spiral case is provided with an air inlet and an air outlet, the air inlet is provided with a current collector, the current collector is in clearance fit with the impeller, the current collector is arranged into an arc transition structure, the impeller further comprises a fixing ring, blades are abutted between the positioning disk and the fixing ring, the current collector comprises a transition section and an extension section, the section of the transition section is of an arc structure, the extension section extends towards the impeller along the axial direction parallel to the current collector from the minimum diameter of the transition section, the diameter of the extension section is smaller than the diameter of a circle formed by the air inlet ends of a plurality of blades, and a gap is arranged between the end face of the extension section towards the impeller and the end face of the fixing ring towards one end of the current collector in the horizontal direction, so that the current collector and the impeller have gaps along the vertical direction and the horizontal direction.
4. A multi-wing centrifugal fan according to claim 3, wherein: the diameter of the transition section is gradually enlarged along the direction away from the impeller, the central angle 6 of the transition section is 80-100 degrees, the maximum chord length of the transition section is X1, the length of the extension section is X2, and the X1:X2 is 1 (0.1-0.4).
5. The multi-wing centrifugal fan according to claim 4, wherein: the central angle 6 of the transition section is 90 degrees, and X1 and X2 are 1:0.28.
6. A multi-wing centrifugal fan according to claim 1, wherein: H1:H2:H23 is 2.5:1:0.2.
7. A multi-wing centrifugal fan according to claim 1, wherein: the central angle 7 of the volute tongue is 120 degrees, and R: H3 is 1:3.7.
8. A multi-wing centrifugal fan according to any of claims 3 to 7, wherein: the impeller is provided with two groups of positioning disks, blades and fixing rings respectively, the impeller is provided with a double-shaft motor, the two groups of positioning disks are connected with the double-shaft motor in a linkage way, the air inlet penetrates through the front side and the rear side of the volute, the volute and the impeller are symmetrically distributed along the radial central axis of the volute, the axes of the double-shaft motor, the air inlet and the current collector are mutually overlapped, the air inlet positions on the front side and the rear side of the volute are respectively provided with a mounting frame, the double-shaft motor is installed between the two groups of mounting frames in a propping mode, the axes of the double-shaft motor are mutually overlapped with the axes of the mounting frames, the mounting frames comprise a central fixing piece and a support fixedly connected with the central fixing piece, the double-shaft motor penetrates through the central fixing piece, and the support comprises an air guide section, a bending section and a mounting section.
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