CN106996382A - A kind of high-speed magnetic-suspension centrifugal Aeration fan and preparation method thereof - Google Patents
A kind of high-speed magnetic-suspension centrifugal Aeration fan and preparation method thereof Download PDFInfo
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- CN106996382A CN106996382A CN201710304356.8A CN201710304356A CN106996382A CN 106996382 A CN106996382 A CN 106996382A CN 201710304356 A CN201710304356 A CN 201710304356A CN 106996382 A CN106996382 A CN 106996382A
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Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- 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
-
- 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
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/058—Bearings magnetic; electromagnetic
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
A kind of high-speed magnetic-suspension centrifugal Aeration fan and preparation method thereof, including single-stage high-speed centrifugal fan, magnetic suspension bearing and the part main part composition of high-speed permanent magnetic synchronous motor three, it is separately positioned on left upper end and right side and the lower-left end of body, wherein, the single-stage high-speed centrifugal fan is provided with impeller, spiral case, type ring, rotating disk, vanelets, little gear, turn bright, bushing, air door housing, described magnetic suspension bearing center-side is provided with motor heart axle, orientation sensor rotor part, mirror image magnetic bearing rotor part longitudinal end, auxiliary bearing part, orientation sensor stator component, radial direction magnetic bearing stator lasmination longitudinal end, radial direction magnetic bearing stator screening cover, motor heart axle is joined directly together with impeller, using advanced frequency control, the technology such as magnetic suspension bearing and high-speed permanent magnetic synchronous motor, eliminate the gear up component and lubricating system of traditional single stage high-speed centrifugal blower, overcome conventional fan, efficiency is low, noise is big, energy consumption is big, volume and weight is big and the defect such as Flow Adjusting Performance difference, realize air quantity, blast, the intelligent control of rotating speed etc., adjust efficiency high, to ensure system optimized operation, reach energy-efficient purpose, complete machine uses skid structure, characteristics of compact layout, install convenient, with higher economic benefit, there to be wide market prospects.
Description
Technical field
Field, more particularly to a kind of high-speed magnetic-suspension centrifugal Aeration fan are manufactured the present invention relates to a kind of Aeration fan
And preparation method thereof.
Background technology
With the increasing of China's environmental pollution management, government increases the input in terms of environment year by year, at sewage
Reason industry has welcome the peak period of rare development, whole scale rapid growth.3 years China's municipal sewages before " 12 " period
Whole nation urban wastewater treatment and reproducible utilization are set during treatment plant's daily handling ability annual average rate of increase is 6.6%, " 12 "
Nearly 430,000,000,000 yuan of construction plan investment is applied, wherein, all kinds of Facilities Constructions invest 427,100,000,000 yuan, and environmentally friendly demand and relevant policies will
Ask, research and development for advanced sewage disposal device and application provide wide development space, at present, sewage treatment process with set
The class that makes preparations for sowing is various, wherein using most popularize, run quantity at most, most ripe technology be activated sludge process, when sewage disposal work
When skill uses Activated Sludge Process, aeration blower is also one of nucleus equipment of handling process.In municipal sewage treatment,
The air quantity and sewage load of air blower（Volume）Gas-water ratio be generally 3-10, China is usually 6.7-7, at trade effluent
In reason, because waste strength is big, gas-water ratio may be up to 35, during municipal sewage treatment, due to seasonal variations, daily sewage
Treating capacity and dissolved oxygen concentration also change.It is therefore desirable to needed for operating air blower is automatically adjusted under constant pressure condition
Air quantity, and require that flow adjustment range is wide, adjust efficiency high, to ensure system optimized operation, reach energy-efficient mesh
's.Sewage treatment plant's energy consumption cost accounts for the 40-80% of its operation maintenance cost, wherein being aerated the energy consumption of air blower during keeping
Total energy consumption large percentage is accounted for, the 50-60% of whole sewage treatment plant's energy consumption is reached.Tsing-Hua University to 559 town sewages of China at
The status of energy consumption of reason factory is analyzed, and analysis result shows, aeration blower energy consumption accounts for the 57% of sewage treatment plant's total energy consumption, because
Reduction operating cost is in this large size city sewage treatment plant, and the energy-conservation to aeration blower proposes strict demand.
At present, the aeration blower size and weight that most sewage treatment plants use are larger, not only increase ground
Processing and the construction investment of air blower, and installing engineering expense is added, noise is larger, and maintenance cost is higher.Therefore, select
Low noise, convenient for installation and maintenance and the minimum air blower of cost is sewage disposal from now in sewage treatment plant's Life cycle
The development trend of industry aeration blower.
The defect existed for prior art is become using advanced there is provided a kind of high-speed magnetic-suspension centrifugal Aeration fan
The technologies such as frequency modulation speed, magnetic suspension bearing and high-speed permanent magnetic synchronous motor, eliminate the tooth of traditional single stage high-speed centrifugal blower
Take turns speedup component and lubricating system, overcome conventional fan, efficiency is low, noise is big, energy consumption is big, volume and weight greatly and Flow-rate adjustment
The defects such as poor-performing, can be achieved local and remote control, and fan efficiency reaches 83%；Fan noise is in below 80dB；Realize wind
The intelligent control of amount, blast, rotating speed etc., and require that flow adjustment range is wide, efficiency high is adjusted, to ensure that system optimization is transported
OK, energy-efficient purpose is reached, complete machine uses skid structure, and characteristics of compact layout, install convenient, production line is advanced rationally, has
Higher economic benefit, will have wide market prospects.
The purpose of the present invention is achieved by the following scheme：
A kind of high-speed magnetic-suspension centrifugal Aeration fan, including single-stage high-speed centrifugal fan, magnetic suspension bearing and high-speed permanent magnetic
The part main part composition of synchronous motor three, described single-stage high-speed centrifugal fan, magnetic suspension bearing and high-speed permanent magnetic synchronous motor
Left upper end and right side and the lower-left end of body are separately positioned on, wherein, the single-stage high-speed centrifugal fan is provided with impeller, snail
Shell, type ring, rotating disk, vanelets, little gear, turning handle, bushing, air door housing, rotating disk upper end is fastened provided with adjustment pin and by nut,
Turn is provided between little gear and turning handle, described magnetic suspension bearing center-side is provided with motor heart axle, orientation sensor rotor
Part, mirror image magnetic bearing rotor part-longitudinal end, auxiliary bearing part, orientation sensor stator component, radial direction magnetic bearing stator
Lamination-longitudinal end, radial direction magnetic bearing stator screening cover, motor heart axle is joined directly together with impeller, radial direction magnetic bearing stator screening cover
Upper end is fixed by screw, and the lower-left end of described magnetic suspension bearing is respectively equipped with auxiliary bearing a rotor's check ring, thrust disc, axial axis
Rim piece, footpath axial direction sensing rotor part, radial direction magnetic bearing rotor part-axial end, circlip, described magnetic suspension bearing
Left upper end be respectively equipped with radial direction magnetic bearing stator lasmination-axial end, axial end housing, footpath axial direction sensor stator part, axle
To parts of bearings, auxiliary bearing pad, auxiliary bearing part-axial end；Described high-speed permanent magnetic synchronous motor is fixed on motor
Seat upper end, motor cabinet upper end sets back-up ring and fixed by interior angle screw.
The shape selection circular section of the spiral case.
Described motor heart axle and the one end at the impeller place of being joined directly together set radome fairing, and set gas ket, are bolted.
The vanelets lower end is provided with turn, bushing.
The described left side outer end of magnetic suspension bearing 2 is provided with radome.
A kind of preparation method of described high-speed magnetic-suspension centrifugal Aeration fan, the specific implementation step of its preparation method
For：
Single-stage high-speed centrifugal blower：Using design software carry out three-dimensional flow impeller Preliminary design, by CFD software carry out analysis with
Optimization, finally shapes；The design for carrying out another critical component spiral case again is calculated, it is considered to which gas has when being come out from impeller and diffuser
Have it is very big curl up, the flow of gas will be different at exhaust chamber different cross section, and the spiral case passage section of design is along air-flow
Curl up direction gradually to increase, make flow losses of the gas in spiral case minimum by optimization design, the performance evaluation of spiral case needs
Calculate to complete by the entire series value simulation of flow passage component.Critical component three-dimensional flow impeller uses high intensity aviation aluminium, palintrope
Formula is designed, the shaping of five-axle linkage high-speed milling, is tested by CAE analysis, 100%X radiographic inspections and 115% overspeed.
Step 1：Design parameter is arranged
The design parameter that 1.1 users provide
Flow：4800m3/H
Local atmospheric pressure：1.013bar
Boosting：0.7bar, highest boosting：1.1bar
Mean air entry temperature：30℃
Medial humidity：70%
Pumped (conveying) medium：Air
The arrangement and calculating of 1.2 design parameters
Fan inlet increases muffler and filter, and the pressure loss is respectively 200Pa and 1500Pa, so mean air entry pressure：
99600Pa
Intake air temperature：30℃
Ambient humidity：70%
The density of air-suction state gas（）：1.13kg/m3
（According to formulaCalculate）
Charge flow rate：81.5m3/min
Step 2：Pneumatic Calculation
According to design parameter, by rotational speed optimization, rated speed is defined as 24000r/m, and impeller uses semi-open type, in semi-open type
In Impeller Design, when high rotating speed is run, Airflow obstruction is easily formed at impeller inlet, thus usually shortens one at import
The blade axial dimension of half vane number, forms length leaf blade wheel structure, that is, the impeller form with splitterr vanes, reduces leaf
Obstruction of the piece in import to flowing, now the position of short blade should optimize determination.
The performance Analysis and Calculation of impeller is carried out using Numeca softwares, is calculated using one channel model.Result of calculation
Show that fan performance meets design requirement, the maximum speed for calculating blower fan is 27000r/m, and maximum shaft power is
138.5kW。
Step 3：The design of casing
The design and calculating of 3.1 inlet plenums
Using axial admission form, in single-stage cantilever formula air blower or booster.
The design of 3.2 import adjustable guide vane mechanisms
Variable inlet guide vane is mounted in one group of blade before impeller inlet, can be rotated around the rotary shaft of itself, often rotate one
Individual angle is exactly a stator established angle, and air-flow velocity attitude before impeller is entered changes, and stator blade profile is by number
Extracted according to storehouse and carry out optimization design.The relation curve of the stator anglec of rotation and flow, efficiency is measured by experiment；
Import adjustable guide vane regulative mode：By controlling power driver to control to transport before and after the connecting rod of entry guide vane governor motion
It is dynamic, drive the ring-shaped piece outside stator to be moved in a circle around fan inlet center line by moving forward and backward for connecting rod, Jin Ertong
Crossing connector drives stator to reach control stator switch around the rotation of respective central shaft.
The design of 3.3 exhaust volutes
Current air blower Volute Design method, is essentially all to be designed using the theory of momentum moment preserving, i.e.,：
, then
The shape selection circular section spiral case of spiral case；
It is isodiametric circular section spiral case to spiral case inlet radius r4, the section radius of circle is calculated by following equation：
In formula：,
（m/sec）
（m3/sec）
According to differenceThe radius of circle at place, you can make spiral case inlet pressure.Further according to theoretical calculation incorporation engineering Practical adjustment spiral case
Inlet Position carry out spiral case optimization design, reduce secondary flow loss, spiral case cross sectional shape is asymmetric circle；
Well rear complete machine carries out numerical simulation calculation to housing design, and the efficiency of blower fan is 84.5%.
Step 4：Import adjustable guide vane
4.1, the true stress value of blade is calculated using ANSYS programs, the stress value safety coefficient that the program is drawn takes 1.0,
The maximum stress value calculated should be not more than the allowable stress from material；
7A09 aluminium bar tensile strength of mechanical property σ b (MPa)：>=530, elongation stress σ p0.2 (MPa)：≥400；
There is deviation in the calculating at blade root, calculation and check is carried out to the stress at blade root using hot spot stress method：
A class formation focus calculation method for stress
For the refined net no more than 0.4t, its structural stress should be calculated as follows：
In formulaFor structural stress point, t is vane thickness,WithFor interpolation point stress value：
B class formation focus calculation method for stress
For the refined net no more than 4mm, its structural stress should be calculated according to the following formula：
WhereinFor the structural stress of focus；
It is focus to take stress point position maximum at blade root, carries out focus Stress calculation,=350.2MPa, material 7A09 aluminium bars
Meet and require.
Step 5：Critical Rotating Speed Calculation
The critical speed of rotor is calculated using the model analysis module of ANSYS softwares；
The first critical speed that rotor can be calculated is 48060r/min, and the maximum (top) speed 27000r/min of blower fan is avoided
The critical speed of rotor.The mode formation of rotor is calculated simultaneously.
Step 6：With the connection of motor
Motor and impeller direct connection, gearless speeder, without any Mechanical Contact, without lubricating oil system, do not wear and tear and energy
Amount loss, maintenance cost is relatively low；
According to formula
P：Shaft power（kW）
n：Rotating speed（r/min）
Declared working condition shaft power 105kW, during rotating speed 24000r/min, moment of torsion is 41.8Nm；
Shaft power 138kW, during rotating speed 26800r/min, moment of torsion is 49.2Nm；
Safety coefficient takes 2, and rubbing surface needs the moment of torsion transmitted to be 98.4Nm；
Frictional force F1=98.4/0.012=8200N needed for calculating；
The bolt pretightening needed：F2=8200/0.17=48235N；
M24 bolt pretightenings are calculated：；
From 8.8 grade bolts：P0=77660N；
From 9.8 grade bolts：P0=138500N；
In order to which safe class is some higher, it should select 9.8 grade bolts, material selection 25Cr2MoV, the yield limit of the material
≥785MPa。
Produce 138500N pretightning force, the lengthening variable of bolt：
138500/353=392Mpa；
Strain=
Elongation=mm；
In the range of elastic deformation amount, 0.1mm, pretightning force increase 37400N are often extended.
The long 197mm of M24 bolt（Material is 25Cr2MoV）The maximal tensility amount for producing plastic deformation is calculated：
Stress/strain=modulus of elasticity；
Strain=stress/modulus of elasticity；
25Cr2MoV yield limits >=785MPa, modulus of elasticity：N/m2；
Maximum strain=
Maximal tensility=mm
Beneficial effects of the present invention：
A kind of high-speed magnetic-suspension centrifugal Aeration fan and preparation method thereof, use advanced frequency control, magnetic suspension bearing with
And the technology such as high-speed permanent magnetic synchronous motor, eliminate the gear up component and lube system of traditional single stage high-speed centrifugal blower
System, overcomes conventional fan, and efficiency is low, noise is big, energy consumption is big, volume and the defect, realization such as weight is big and Flow Adjusting Performance is poor
The intelligent control of air quantity, blast, rotating speed etc., adjusts efficiency high, to ensure system optimized operation, reaches energy-efficient purpose,
Complete machine uses skid structure, and characteristics of compact layout, install convenient, production line is advanced rationally, with higher economic benefit, will have wide
Market prospects.
Fig. 1 is the structural representation of the present invention.
Wherein 1- single-stage high-speed centrifugal fans, 2- magnetic suspension bearings, 3- high-speed permanent magnetic synchronous motors, 4- impellers, 5- snails
Shell, 6- little gears, 7- radome fairings, 8- vanelets, 9- rotating disks, 10- adjustment pins, 11- nuts, 12- bolts, 13- air door housings,
14- turns of bright, 15- orientation sensor stator components, 16- orientation sensor rotor parts, 17- heart axles, 18- thrust discs, 19 screws,
6 jiaos of screws, 22- turns, 23- bushings, 24- back-up rings, 25- motor cabinets, 26- packing rings, 27- in 20- auxiliary bearing parts, 21-
Type ring, 28- radial direction magnetic bearings stator lasmination-longitudinal end, 29- radial direction magnetic bearing stator screening covers, 30- radial direction magnetic bearing stator stacks
Piece-axial end, 31- axial directions end housing, 32- footpaths axial direction sensor stator part, 33- axial bearing components, 34- asessory shaft rims
End shield under piece, 35- auxiliary bearings part-axial end, 36-, 37- auxiliary bearing a rotor's check rings, 38- cod pads,
39- footpaths axial direction sensing rotor part, 40- radial direction magnetic bearings rotor part-axial end, 41- circlips, 42- mirror image magnetic bearings
Rotor part-longitudinal end.
Embodiment
The present invention is further illustrated for ECDC specific embodiment below：
Embodiment 1
A kind of high-speed magnetic-suspension centrifugal Aeration fan, including single-stage high-speed centrifugal fan 1, magnetic suspension bearing 2 and high speed are forever
The part main part composition of magnetic-synchro motor 3 three, described single-stage high-speed centrifugal fan 1, magnetic suspension bearing 2 and high-speed permanent magnetic are synchronous
Motor 3 is separately positioned on left upper end and right side and the lower-left end of body, wherein, the single-stage high-speed centrifugal fan 1 is provided with
Impeller 4, spiral case 5, type ring 27, rotating disk 9, vanelets 8, little gear 6, turning handle 14, bushing 23, air door housing 13, the upper end of rotating disk 9 is set
There is adjustment pin 10 and fastened by nut 11, is provided between little gear 6 and turning handle 14 in turn 22, described magnetic suspension bearing 2
Heart end is provided with motor heart axle 17, orientation sensor rotor part 16, mirror image magnetic bearing rotor part-longitudinal end 42, auxiliary bearing
Part 20, orientation sensor stator component 15, radial direction magnetic bearing stator lasmination-longitudinal end 28, radial direction magnetic bearing stator screening cover
29, motor heart axle 17 is joined directly together with impeller 4, and the upper end of radial direction magnetic bearing stator screening cover 29 is fixed by screw 19, described magnetic
The lower-left end of suspension bearing 2 is respectively equipped with auxiliary bearing a rotor's check ring 37, and thrust disc 18, cod pad 38, footpath is axially passed
Feel rotor part 39, radial direction magnetic bearing rotor part-axial end 40, circlip 41, the left upper end of described magnetic suspension bearing 2
It is respectively equipped with radial direction magnetic bearing stator lasmination-axial end 30, axial end housing 31, footpath axial direction sensor stator part 32, axial direction
Parts of bearings 33, auxiliary bearing pad 34, auxiliary bearing part-axial end 35；Described high-speed permanent magnetic synchronous motor 3 is fixed on
The upper end of motor cabinet 25, the upper end of motor cabinet 25 sets back-up ring 24 and fixed by interior angle screw 21.
Embodiment 2
A kind of high-speed magnetic-suspension centrifugal Aeration fan, the shape selection circular section of the spiral case 5.
Embodiment 3
A kind of high-speed magnetic-suspension centrifugal Aeration fan, motor heart axle 17 and the one end at the place of being joined directly together of impeller 4 set radome fairing 7,
And gas ket 26 is set, fixed by bolt 12.
Embodiment 4
A kind of high-speed magnetic-suspension centrifugal Aeration fan, the lower end of vanelets 8 is provided with turn 22, bushing 23.
Embodiment 5
A kind of high-speed magnetic-suspension centrifugal Aeration fan, the described left side outer end of magnetic suspension bearing 2 is provided with radome 36.
Embodiment 6
Described a kind of high-speed magnetic-suspension centrifugal Aeration fan and preparation method thereof, the specific implementation step of its preparation method is：
Single-stage high-speed centrifugal blower：Using design software carry out three-dimensional flow impeller Preliminary design, by CFD software carry out analysis with
Optimization, finally shapes；The design for carrying out another critical component spiral case again is calculated, it is considered to which gas has when being come out from impeller and diffuser
Have it is very big curl up, the flow of gas will be different at exhaust chamber different cross section, and the spiral case passage section of design is along air-flow
Curl up direction gradually to increase, make flow losses of the gas in spiral case minimum by optimization design, the performance evaluation of spiral case needs
Calculate to complete by the entire series value simulation of flow passage component.Critical component three-dimensional flow impeller uses high intensity aviation aluminium, palintrope
Formula is designed, the shaping of five-axle linkage high-speed milling, is tested by CAE analysis, 100%X radiographic inspections and 115% overspeed.
Step 1：Design parameter is arranged
The design parameter that 1.1 users provide
Flow：4800m3/H
Local atmospheric pressure：1.013bar
Boosting：0.7bar, highest boosting：1.1bar
Mean air entry temperature：30℃
Medial humidity：70%
Pumped (conveying) medium：Air
The arrangement and calculating of 1.2 design parameters
Fan inlet increases muffler and filter, and the pressure loss is respectively 200Pa and 1500Pa, so mean air entry pressure：
99600Pa
Intake air temperature：30℃
Ambient humidity：70%
The density of air-suction state gas（）：1.13kg/m3
（According to formulaCalculate）
Charge flow rate：81.5m3/min
Step 2：Pneumatic Calculation
According to design parameter, by rotational speed optimization, rated speed is defined as 24000r/m, and impeller uses semi-open type, in semi-open type
In Impeller Design, when high rotating speed is run, Airflow obstruction is easily formed at impeller inlet, thus usually shortens one at import
The blade axial dimension of half vane number, forms length leaf blade wheel structure, that is, the impeller form with splitterr vanes, reduces leaf
Obstruction of the piece in import to flowing, now the position of short blade should optimize determination.
The performance Analysis and Calculation of impeller is carried out using Numeca softwares, in order to save the calculating time, using one channel model
Calculated.Result of calculation shows that fan performance meets design requirement, and the maximum speed for calculating blower fan is 27000r/m, most
Big shaft power is 138.5kW.
Step 3：The design of casing
The design and calculating of 3.1 inlet plenums
Using axial admission form, in single-stage cantilever formula air blower or booster.
The design of 3.2 import adjustable guide vane mechanisms
Variable inlet guide vane is mounted in one group of blade before impeller inlet, can be rotated around the rotary shaft of itself, often rotate one
Individual angle is exactly a stator established angle, and air-flow velocity attitude before impeller is entered changes, and stator blade profile is by number
Extracted according to storehouse and carry out optimization design.The relation curve of the stator anglec of rotation and flow, efficiency is measured by experiment；
Import adjustable guide vane regulative mode：By controlling power driver to control to transport before and after the connecting rod of entry guide vane governor motion
It is dynamic, drive the ring-shaped piece outside stator to be moved in a circle around fan inlet center line by moving forward and backward for connecting rod, Jin Ertong
Crossing connector drives stator to reach control stator switch around the rotation of respective central shaft.
The design of 3.3 exhaust volutes
Current air blower Volute Design method, is essentially all to be designed using the theory of momentum moment preserving, i.e.,：
, then
The shape selection circular section spiral case of spiral case；
It is isodiametric circular section spiral case to spiral case inlet radius r4, the section radius of circle is calculated by following equation：
In formula：,
（m/sec）
（m3/sec）
According to differenceThe radius of circle at place, you can make spiral case inlet pressure.Further according to theoretical calculation incorporation engineering Practical adjustment snail
The Inlet Position of shell carries out the optimization design of spiral case, reduces secondary flow loss, spiral case cross sectional shape is asymmetric circle；
Well rear complete machine carries out numerical simulation calculation to housing design, and the efficiency of blower fan is 84.5%.
Step 4：Fan inlet adjustable guide vane
4.1, the true stress value of blade is calculated using ANSYS programs, the stress value safety coefficient that the program is drawn takes 1.0,
The maximum stress value calculated should be not more than the allowable stress from material；
7A09 aluminium bar tensile strength of mechanical property σ b (MPa)：>=530, elongation stress σ p0.2 (MPa)：≥400；
There is deviation in the calculating at blade root, calculation and check is carried out to the stress at blade root using hot spot stress method：
A class formation focus calculation method for stress
For the refined net no more than 0.4t, its structural stress should be calculated as follows：
In formulaFor structural stress point, t is vane thickness,WithFor interpolation point stress value：
B class formation focus calculation method for stress
For the refined net no more than 4mm, its structural stress should be calculated according to the following formula：
WhereinFor the structural stress of focus；
It is focus to take stress point position maximum at blade root, carries out focus Stress calculation,=350.2MPa, material 7A09 aluminium bars
Meet and require.
Step 5：Critical Rotating Speed Calculation
The critical speed of rotor is calculated using the model analysis module of ANSYS softwares；
The first critical speed that rotor can be calculated is 48060r/min, and the maximum (top) speed 27000r/min of blower fan is avoided
The critical speed of rotor.The mode formation of rotor is calculated simultaneously.
Step 6：With the connection of motor
Motor and impeller direct connection, gearless speeder, without any Mechanical Contact, without lubricating oil system, do not wear and tear and energy
Amount loss, maintenance cost is relatively low；
According to formula
P：Shaft power（kW）
n：Rotating speed（r/min）
Declared working condition shaft power 105kW, during rotating speed 24000r/min, moment of torsion is 41.8Nm；
Shaft power 138kW, during rotating speed 26800r/min, moment of torsion is 49.2Nm；
Safety coefficient takes 2, and rubbing surface needs the moment of torsion transmitted to be 98.4Nm；
Frictional force F1=98.4/0.012=8200N needed for calculating；
The bolt pretightening needed：F2=8200/0.17=48235N；
M24 bolt pretightenings are calculated：；
From 8.8 grade bolts：P0=77660N；
From 9.8 grade bolts：P0=138500N；
In order to which safe class is some higher, it should select 9.8 grade bolts, material selection 25Cr2MoV, the yield limit of the material
≥785MPa。
Produce 138500N pretightning force, the lengthening variable of bolt：
138500/353=392Mpa；
Strain=
Elongation=mm；
In the range of elastic deformation amount, 0.1mm, pretightning force increase 37400N are often extended.
The long 197mm of M24 bolt（Material is 25Cr2MoV）The maximal tensility amount for producing plastic deformation is calculated：
Stress/strain=modulus of elasticity；
Strain=stress/modulus of elasticity；
25Cr2MoV yield limits >=785MPa, modulus of elasticity：N/m2；
Maximum strain=
Maximal tensility=mm。
Claims (9)
1. a kind of high-speed magnetic-suspension centrifugal Aeration fan, it is characterised in that：Including single-stage high-speed centrifugal fan, magnetic suspension shaft
Hold and the part main part composition of high-speed permanent magnetic synchronous motor three, described single-stage high-speed centrifugal fan, magnetic suspension bearing and high speed
Permagnetic synchronous motor is separately positioned on left upper end and right side and the lower-left end of body, wherein；The single-stage high-speed centrifugal fan
Impeller is provided with, spiral case, type ring, rotating disk, vanelets, little gear, turning handle, bushing, air door housing, rotating disk upper end is provided with adjustment pin
And fastened by nut, turn is provided between little gear and turning handle；Described magnetic suspension bearing center-side is provided with motor heart axle, fixed
To rotor sensor part, mirror image magnetic bearing rotor part-longitudinal end, auxiliary bearing part, orientation sensor stator component, footpath
To magnetic bearing stator lasmination-longitudinal end, radial direction magnetic bearing stator screening cover, motor heart axle is joined directly together with impeller, radial direction magnetic axis
Hold stator shielding cover end fixed by nut；The lower-left end of described magnetic suspension bearing is respectively equipped with auxiliary bearing a rotor's check ring,
Thrust disc, cod pad, footpath axial direction sensing rotor part, radial direction magnetic bearing rotor part-axial end, circlip；Institute
The left upper end for the magnetic suspension bearing stated is respectively equipped with radial direction magnetic bearing stator lasmination-axial end, and axial end housing, footpath is axially sensed
Device stator component, axial bearing components, auxiliary bearing pad, auxiliary bearing part-axial end；The synchronous electricity of described high-speed permanent magnetic
Machine is fixed on motor cabinet upper end, and motor cabinet upper end sets back-up ring and fixed by interior angle screw；The shape selection circle of described spiral case is cut
Face；Described motor heart axle and the one end at the impeller place of being joined directly together set radome fairing, and set gas ket, are bolted；The leaflet
Piece lower end is provided with turn, bushing；Outer end is provided with radome on the left of described magnetic suspension bearing.
2. a kind of high-speed magnetic-suspension centrifugal Aeration fan according to claim 1 and base preparation method, it is characterised in that：
The specific implementation step of its preparation method is：
Step 1：Design parameter is arranged
The design parameter that user provides
Flow：4800m3/H
Local atmospheric pressure：1.013bar
Boosting：0.7bar, highest boosting：1.1bar
Mean air entry temperature：30℃
Medial humidity：70%
Pumped (conveying) medium：Air
The arrangement and calculating of design parameter
Fan inlet increases muffler and filter, and the pressure loss is respectively 200Pa and 1500Pa, so mean air entry pressure：
99600Pa
Intake air temperature：30℃
Ambient humidity：70%
The density of air-suction state gas（）：1.13kg/m3
（According to formulaCalculate）
Charge flow rate：81.5m3/min
Pneumatic Calculation
According to design parameter, by rotational speed optimization, rated speed is defined as 24000r/m, and impeller uses semi-open type, in semi-open type
In Impeller Design, when high rotating speed is run, Airflow obstruction is easily formed at impeller inlet, thus usually shortens one at import
The blade axial dimension of half vane number, forms length leaf blade wheel structure, that is, the impeller form with splitterr vanes, reduces leaf
Obstruction of the piece in import to flowing, now the position of short blade should optimize determination.
3. step 2：The design of import adjustable guide vane mechanism
Variable inlet guide vane is mounted in one group of blade before impeller inlet, can be rotated around the rotary shaft of itself, often rotate one
Individual angle is exactly a stator established angle, and air-flow velocity attitude before impeller is entered changes, and stator blade profile is by number
Extracted according to storehouse and carry out optimization design.
4. the relation curve of the stator anglec of rotation and flow, efficiency is measured by experiment；Import adjustable guide vane regulative mode：Pass through
The connecting rod of control power driver control entry guide vane governor motion is moved forward and backward, and passes through the drive stator that moves forward and backward of connecting rod
Outer ring-shaped piece moves in a circle around fan inlet center line, and then drives stator around respective central shaft by connector
Rotation has reached control stator switch.
5. step 3：The design of exhaust volute
Current air blower Volute Design method, is essentially all to be designed using the theory of momentum moment preserving, i.e.,：
, then
The shape selection circular section spiral case of spiral case；
It is isodiametric circular section spiral case to spiral case inlet radius r4, the section radius of circle is calculated by following equation：
In formula：,
（m/sec）
（m3/sec）
According to differenceThe radius of circle at place, you can make spiral case inlet pressure.
6. step 4：Import adjustable guide vane
The true stress value of blade is calculated using ANSYS programs, the stress value safety coefficient that the program is drawn takes 1.0, calculating
The maximum stress value gone out should be not more than the allowable stress from material；
7A09 aluminium bar tensile strength of mechanical property σ b (MPa)：>=530, elongation stress σ p0.2 (MPa)：≥400；
There is deviation in the calculating at blade root, calculation and check is carried out to the stress at blade root using hot spot stress method：
A class formation focus calculation method for stress
For the refined net no more than 0.4t, its structural stress should be calculated as follows：
In formulaFor structural stress point, t is vane thickness,WithFor interpolation point stress value：
B class formation focus calculation method for stress
For the refined net no more than 4mm, its structural stress should be calculated according to the following formula：
WhereinFor the structural stress of focus；
It is focus to take stress point position maximum at blade root, carries out focus Stress calculation,=350.2MPa, material 7A09 aluminium
Rod, which is met, to be required.
7. step 5：With the connection of motor
Motor and impeller direct connection, gearless speeder, without any Mechanical Contact, without lubricating oil system, do not wear and tear and energy
Amount loss, maintenance cost is relatively low；
According to formula
P：Shaft power（kW）
n：Rotating speed（r/min）
Declared working condition shaft power 105kW, during rotating speed 24000r/min, moment of torsion is 41.8Nm；
Shaft power 138kW, during rotating speed 26800r/min, moment of torsion is 49.2Nm；
Safety coefficient takes 2, and rubbing surface needs the moment of torsion transmitted to be 98.4Nm；
Frictional force F1=98.4/0.012=8200N needed for calculating；
The bolt pretightening needed：F2=8200/0.17=48235N；
M24 bolt pretightenings are calculated：；
From 8.8 grade bolts：P0=77660N；
From 9.8 grade bolts：P0=138500N；
In order to which safe class is some higher, it should select 9.8 grade bolts, material selection 25Cr2MoV, the yield limit of the material
≥785MPa。
8. step 6：Produce 138500N pretightning force, the lengthening variable of bolt：
138500/353=392Mpa；
Strain=
Elongation=mm；
In the range of elastic deformation amount, 0.1mm, pretightning force increase 37400N are often extended.
9. step 7：The long 197mm of M24 bolt（Material is 25Cr2MoV）The maximal tensility amount for producing plastic deformation is calculated：
Stress/strain=modulus of elasticity；
Strain=stress/modulus of elasticity；
25Cr2MoV yield limits >=785MPa, modulus of elasticity：N/m2；
Maximum strain=
Maximal tensility=mm。
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Cited By (6)
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| CN107725113A (en) * | 2017-10-31 | 2018-02-23 | 陈贤 | Two-stage cantilevered axle stream expanding machine |
| CN109896645A (en) * | 2019-04-01 | 2019-06-18 | 江苏道明化学有限公司 | A kind of lamination rotary cutting aerator and its installation method |
| CN112759071A (en) * | 2020-12-30 | 2021-05-07 | 武汉飞博乐环保工程有限公司 | Aeration device for sewage rapid biochemical treatment system |
| CN112879317A (en) * | 2021-01-30 | 2021-06-01 | 海拓宾未来工业集团有限公司 | High-speed high-pressure magnetic suspension centrifugal two-stage air compressor and control method thereof |
| CN113190991A (en) * | 2021-04-26 | 2021-07-30 | 联合汽车电子有限公司 | Bearing temperature detection method and system of electric drive axle |
| CN114048690A (en) * | 2021-10-25 | 2022-02-15 | 鑫磊压缩机股份有限公司 | Design method of magnetic suspension motor direct-drive centrifugal blower |
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| CN112879317B (en) * | 2021-01-30 | 2022-08-16 | 江苏海拓宾未来工业科技集团有限公司 | High-speed high-pressure magnetic suspension centrifugal two-stage air compressor and control method thereof |
| CN113190991A (en) * | 2021-04-26 | 2021-07-30 | 联合汽车电子有限公司 | Bearing temperature detection method and system of electric drive axle |
| CN113190991B (en) * | 2021-04-26 | 2024-04-16 | 联合汽车电子有限公司 | Bearing temperature detection method and system for electric drive axle |
| CN114048690A (en) * | 2021-10-25 | 2022-02-15 | 鑫磊压缩机股份有限公司 | Design method of magnetic suspension motor direct-drive centrifugal blower |
| CN114048690B (en) * | 2021-10-25 | 2024-04-02 | 鑫磊压缩机股份有限公司 | Design method of magnetic suspension motor direct-drive centrifugal blower |
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