CN103821742A - Low-noise head-on fan for indoor vehicle test - Google Patents
Low-noise head-on fan for indoor vehicle test Download PDFInfo
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- CN103821742A CN103821742A CN201410100221.6A CN201410100221A CN103821742A CN 103821742 A CN103821742 A CN 103821742A CN 201410100221 A CN201410100221 A CN 201410100221A CN 103821742 A CN103821742 A CN 103821742A
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Abstract
The invention provides a low-noise head-on fan for an indoor vehicle test. The low-noise head-on fan comprises a machine shell, a motor, an impeller, a sound absorption device and a protection net, the machine shell comprises an air inlet and an air outlet, a flow collecting area, a movable blade area, a sound absorption area and an air outlet area are sequentially arranged between the air inlet and the air outlet, the section areas of the areas are decreased progressively, and the tail end of the air outlet area right faces the front portion of a tested vehicle. The motor is fixedly connected in the machine shell, the impeller comprises a hub and blades, the hub is fixedly connected to an output shaft of the motor, the blades are circumferentially and evenly distributed and are fixedly connected to the hub, the protection net comprises a flow collecting protection net and an air outlet protection net, the flow collecting protection net is fixedly connected to the position of the air inlet, and the air outlet protection net is fixedly connected to the position of the air outlet. The low-noise head-on fan effectively reduces head-on fan noise, the working environment of indoor work staff is improved, it is ensured that the indoor environment is within the reasonable decibel range, working quality is ensured, body health of the indoor work staff is ensured, and correspondingly, the working efficiency and the safety production are ensured.
Description
Technical field
The present invention relates to a kind of head-on blower fan, relate in particular to a kind of indoor vehicle test low noise blower fan that heads on, belong to vehicle testing technical field.
Background technique
In the test of detection vehicle performance, change in order to reduce internal and external environment the impact bringing to test, can this vehicle performance test be changed into indoor from outdoor test place, for example: indoor road simulation dynamometer, road simulation dynamometer is as a kind of indoor detection facility of diagnosis automobile dynamic quality, and it can simulate various road traveling resistances.
But, for example, in the time of laboratory test vehicle performance (: while simulating road driving on chassis dynamometer), although drive wheel to roll on cylinder, automobile is not moved, thereby lack head-on wind field environment, cause the rate of cooling relative deficiency of engine-cooling system.In order to reproduce automobile residing head-on wind field environment on road, make test room's intrinsic motivation working environment more approach real road driving cycle, guarantee that engine operation is reliable, durable and obtain good power character and economic index, arrange that the follow-up-type blower fan that heads on makes engine-cooling system keep optimum Working very necessary.
And existing head-on blower fan can produce high-decibel noise in normal using process, seriously polluted to indoor noise environment, craftmanship can not get guarantee, and strong influence of noise is to staff's working efficiency; In the time that office work personnel long term exposure is among the severe noise circumstance of this high-decibel, can give staff's physiology and cause psychologically bad impact, even there is great threat to healthy, and can not guarantee relevant work personnel's safety in production.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of indoor vehicle test low noise blower fan that heads on.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of indoor vehicle test low noise blower fan that heads on is provided, comprises casing, motor, impeller, sound absorber and protective net; Described casing comprises intake grill and exhaust outlet, is followed successively by afflux district, movable vane district, acoustic attenuation zone and wind outlet area from intake grill to exhaust outlet, and the section area in each interval successively decreases, the supercharging step by step of blower fan interior flow field, the just front portion to test vehicle of described wind outlet area end; Described motor is fixed in casing inside, and motor output shaft, afflux district, movable vane district and acoustic attenuation zone coaxial line; Described impeller comprises wheel hub and blade, and described wheel hub is fixed on motor output shaft, and described blade is circumferentially evenly arranged and is fixed on wheel hub; Described sound absorber is positioned at acoustic attenuation zone; Described protective net comprises afflux protective net and air-out protective net, described afflux protective net is fixed in the intake grill position in afflux district, avoid large scale foreign matter to be inhaled into blower fan, described air-out protective net is fixed in air outlet position place, wind outlet area, prevents from that fan blade from coming off to be blown exhaust outlet.
Head on when the realizing motor road test lab simulation of wind field environment, arranges that in the dead ahead of test vehicle head-on blower fan can the residing head-on wind field environment of simulated automotive actual travel.In order to guarantee that head-on wind function carries out effectively coolingly to dynamic test vehicle, blower fan air output changes along with the variation of test vehicle travelling speed.When exhaust outlet area one timing of blower fan, in order to meet vehicle under the different speeds of operation demand to blower fan air output, can increase the head-on air output of blower fan by improving blower fan wind speed.
In the time that blower fan is normally worked, can produce strong noise, will worsen test indoor noise environment, further can affect office work personnel's physical and mental health.Adopt sound absorption mode to reduce head-on fan noise, when entering air in casing behind acoustic attenuation zone, realize the object of blower fan noise reduction.
Further, described casing is corrosion resistant plate welding body, and each interval is affixed by flange.
Further, the cross section of described afflux district, movable vane district and acoustic attenuation zone is circular, and the cross section of described wind outlet area is uniform section rectangle; Between described acoustic attenuation zone and wind outlet area, be provided with a translation field, enclosure interior cross section, described translation field is variable cross section, variable cross section is in order to realize docking of acoustic attenuation zone and difformity cross section, wind outlet area, be connected with circular section, acoustic attenuation zone on the one hand, in order to be connected with rectangular cross-section, wind outlet area on the other hand, be connected in cross section altogether with cross section, acoustic attenuation zone therefore its one end is circular cross-section, the other end is that rectangular cross-section is connected in cross section altogether with wind outlet area.
Further, described afflux district is horn-like structure, and air dielectric is inhaled into casing inside by afflux district, and reduces along air approach axis sectional area; Described movable vane district inner section is uniform section, and with altogether cross section of afflux district end, with guarantee air dielectric clear and coherent enter casing, and accelerated.
Further, the sound absorber in described acoustic attenuation zone is provided with interior perforation back-up ring, the tender outer back-up ring of porous sound absorption, and described acoustic attenuation zone inner section is uniform section, and district is consistent with movable vane.Acoustic attenuation zone can make air-flow in pressurization, air-flow sees through interior perforation back-up ring and enters the continuous medium of porous sound absorption, when air-flow is propagated in sound-absorbing porous material, because being converted into heat energy by friction, acoustic energy dissipates, effectively absorb the main component in the noise having produced, can reduce thus fan noise, improve office work personnel's working environment.
Further, described motor is direct current variable frequency motor, and along with the rising of test wheel rotating speed, motor speed increases; Described motor is fixed on a support, and described support welding is in casing inside.
Further, described blade, along its sense of rotation to antecurvature, adopts circular arc streamline blade, and thickness from its root to end reduces gradually, has reduced as far as possible the noise producing due to blade and air effect, improves office work personnel's working environment; Described blade is preferably aluminum alloy casting body.
Further, described casing is fixed on fixing frame, and described fixing frame is preferably weld holder, and described fixing frame bottom is provided with spike or castor.
Or described casing is fixed on fixing frame, described fixing frame is preferably weld holder, and described fixing frame bottom is provided with spike and castor.The adjustable spike of each castor adjacent locations setting height(from bottom), is moving to after specified position blower fan, by adjusting spike height and then completing the support of blower fan and firm.
Because the physical dimension of blower fan is head-on large, quality weight, bring inconvenience to mobile and use, in order to facilitate movement and the use of this blower fan that heads on, the structure that castor and spike the are integrated movement of blower fan and firm that heads on, castor provides convenience for blower fan moves, not only firm, be also convenient to mobile; In the time that blower fan moves to destination, utilize spike the blower fan that heads on can be stabilized on test stand, spike height is adjustable simultaneously, meets the requirement for height of dissimilar test vehicle heat dissipation grid.
Advantage and good effect that the present invention has are: this blower fan that heads on not only can provide a kind of head-on wind field environment for indoor vehicle test, make laboratory test vehicle operation operating mode more approach road vehicle driving cycle, also realized the object to test vehicle engine cooling; And, this blower fan that heads on has reduced head-on fan noise effectively, improve office work personnel's working environment, guarantee that indoor noise environment is in rational decibel scope, craftmanship is guaranteed, the healthy of office work personnel is guaranteed, correspondingly guaranteed working efficiency and safety in production; This blower fan that heads on also has support firmly and mobile advantage easily.
Accompanying drawing explanation
Fig. 1 is the site layout project schematic diagram of low noise head-on wind machine specific embodiment of the present invention;
Fig. 2 is the structural representation of blower fan head-on in Fig. 1;
Fig. 3 is the side view of blower fan head-on in Fig. 1;
Fig. 4 is impeller front view in Fig. 1;
Fig. 5 be in Fig. 5 impeller B to view;
Fig. 6 is the A-A sectional view of blower fan head-on in Fig. 2;
Fig. 7 is the C part zoomed-in view in Fig. 6;
Fig. 8 is the partial view of interior perforation back-up ring in Fig. 7.
In figure:
1. test vehicle, 2. motor, blower fan, 4. intake grill 3. head on, 5. casing, 6. impeller, 7. motor, 8. sound absorption structure, 9. castor, 10. spike, 11. afflux protective nets, 12. air-out protective nets, 13. exhaust outlets, 14. wheel hubs, 15. blades, 16. leaf leading edges, 17. leaf trailing edges, 18. blade roots, 19. blade tip, 20. interior perforation back-up rings, 21. porous sound absorption silk flosses, 22. outer back-up rings;
I-afflux district, II-movable vane district, III-acoustic attenuation zone, IV-translation field, V-wind outlet area;
A-A represents head-on blower fan cross sectional view;
C represents sound absorption structure partial enlarged view;
L represents the length of blower fan rectangle exhaust outlet;
W represents the width of blower fan rectangle exhaust outlet;
H represents that blower fan rectangle exhaust outlet lower end surface is apart from face height;
D represents impeller outer diameter;
D represents impeller hub diameter.
Embodiment
For to the more deep understanding of the present invention, enumerate a specific embodiment below, and by reference to the accompanying drawings, the present invention is described in further detail.
The present embodiment is a kind of indoor vehicle test low noise blower fan that heads on, its site layout project figure as shown in Figure 1, for the head-on wind field environment of test vehicle in simulating chamber in real road travels, arrange that in test vehicle 1 dead ahead head-on blower fan 3 is realized this target.
As shown in Figures 2 and 3, the head on agent structure of blower fan of low noise comprises casing 5, impeller 6, motor 7, sound absorption structure 8, castor 9, spike 10, afflux protective net 11, air-out protective net 12.From intake grill 4 to exhaust outlet 13, casing 5 is mainly made up of afflux district I, movable vane district II, acoustic attenuation zone III, translation field IV and wind outlet area V, each district housing is made up of corrosion resistant plate welding, and thickness of shell is 0.005～0.008m, is interconnected to as a whole between housing by flange.Afflux district I is the annulus that section area successively decreases, and annulus length is 0.20m, and in order to facilitate entering of air dielectric, the internal diameter of section area maximum is 0.70m, and the internal diameter of section area minimum is 0.62m, and afflux protective net 11 is arranged on intake grill 4 positions; Movable vane district II is that internal diameter is the circular ring with constant cross section of 0.62m, annulus length is 0.7m, impeller 6 and motor 7 major parts are arranged in movable vane district II by being welded on the support of II inside, movable vane district, impeller 6 and motor 7 are coaxial with movable vane district II annulus housing, movable vane district II intra vane 15 1 sides are connected with afflux district I by flange, and movable vane district II inner wheel hub 14 1 sides are connected with acoustic attenuation zone III by flange; Acoustic attenuation zone III is made up of interior perforation back-up ring 20, porous sound absorption continuous 21 and outer back-up ring 22 from the inside to surface successively, acoustic attenuation zone III axial length is 1.3m, interior perforation back-up ring 20 internal diameters are 0.62m, mesosphere acoustic absorbing medium material is asbestos material, outer back-up ring 22 external diameters are 0.7m, III one end, acoustic attenuation zone is connected with movable vane district II by flange, and the other end is connected with translation field IV by flange; Translation field IV is variable section structure, translation field IV cross-directional length is 0.5m, interior cross section annulus side internal diameter is 0.62m, interior cross section rectangular side rectangle is long is 1.1m, wide is 0.84m, sectional shape is that annulus one side is connected with acoustic attenuation zone III by flange, and sectional shape is that rectangle one side is connected with wind outlet area V by flange; Wind outlet area V rectangular area depends on the heat dissipation grid size of test vehicle, in order to meet the different heat dissipation grid sizes of different tests vehicle and apart from face height requirement, size and the relative position of analytic statistics different tests vehicle heat dissipation grid, in the present embodiment, the length of rectangle wind outlet area V is 1.10m, width is 0.84m, it is the metal outer rim that 0.005m, width are 0.06m that 13 4 side welds of rectangle exhaust outlet connect a thickness, and blower fan rectangle exhaust outlet 13 lower end surfaces are 0.64m～0.75m apart from face height scope H.After exhaust outlet area definition, be directly proportional to Vehicle Speed according to blower fan wind speed, blower fan air output can change along with the variation of the speed of a motor vehicle, changes the head-on variation of wind field wind speed, heat dissipating capacity bringing with the speed of a motor vehicle in simulating vehicle actual travel process.
Head-on blower fan, its protective net comprises afflux protective net 11 and air-out protective net 12, and afflux protective net 11 is arranged on I edge of afflux district, and structure is general chain link fence, avoids large scale foreign matter to be inhaled into blower fan; Air-out protective net 12 is arranged on wind outlet area V edge, and structure is welded on wind outlet area V right-hand member by each 2 one metal wires anyhow equally spacedly by rectangle length and width, divides 6 little rectangles by rectangle exhaust outlet 13 grades, prevents that leaf abscission from blowing out blower fan.
As shown in Figure 4 and Figure 5, impeller 6 is made up of with 7 identical circular arc vanes 15 of shape wheel hub 14,7 blades 15 are around wheel hub 14 circumferential arrangement, and blade 15 is antecurvature along its sense of rotation, and blade tip 19 is circular-arc, leaf leading edge 16 is identical with leaf trailing edge 17 length, blade root 18 length are slightly larger than blade tip 19, and each section thickness reduces to blade tip 19 continuously from blade root 18, the D outer diameter=0.61m of impeller 6, diameter d=the 0.21m of wheel hub 14, the established angle β of blade 15 is 30 °.
As Figure 6-Figure 8, acoustic attenuation zone III is to be made up of with outer back-up ring 22 interior perforation back-up ring 20, mesosphere porous sound absorption continuous 21.As shown in Figure 6, acoustic attenuation zone III length is got 1.1m, and its cross section is circular sound absorption coil structures, and sound absorption circle thickness is 0.1m, and sound absorption circle internal diameter is 0.6m.Fig. 7 is the C partial view of annular sound absorption circle, the inner packing material of sound absorption circle is the porous sound absorption silk floss of asbestos material, outside is surrounded and is formed by interior perforation back-up ring 20 and outer back-up ring 22, wherein, perforation back-up ring 20 structures are circular cellular iron plate, punching rate is 50%, aperture is 0.005m, and thickness of slab is 0.002mm, as shown in Figure 8.
Head-on blower fan noise-reducing design principle: when air quantity enters through intake grill 4 after afflux district I, wind speed reduces, and pressure increases; Enter the air quantity of housing after movable vane district II entrance, air quantity is accelerated, and pressure increases, and after continual air-flow is accelerated, enters in movable vane district II, and high velocity air is assembled and turbulent motion occurs in movable vane district II internal cause, produces high-frequency noises.When sound wave enters after the III of acoustic attenuation zone, sound wave sees through interior perforation back-up ring 20, while propagation in porous sound absorption silk floss 21, dissipate because acoustic energy is converted into heat energy by friction, effectively absorb the main component in the noise having produced, acoustic energy is decayed, thereby reduction fan noise, reaches the object of noise elimination.
In order to facilitate low noise head on movement and firm use of blower fan, adopt castor mechanism and Height Adjustable spike mechanism.In the present embodiment, it moves with fixing device by 4 groups of castor-spike unit, and wherein 4 castor mechanisms are bolted on casing outside weldings frame, highly unadjustable; 4 spike mechanisms can regulate height by bolt mechanism.When blower fan is packed up 4 spikes by bolt when mobile, now Mobile fan freely; When blower fan moves to after specified position, by spike height adjustment mechanism, use spike to support blower fan, castor is built on stilts now.4 groups of castor-spike unit, wherein 2 groups of castor-spike cellular installations are on the welding support of the outside lower end of movable vane district II casing, and spike (comparing with castor) is near afflux district I; Other 2 groups of castor-spike cellular installations are on the welding support of the outside lower end of acoustic attenuation zone III casing, and spike (comparing with castor) is near translation field IV.
In blower fan moving process, castor can rotate, and blower fan is moved along different directions.Move to after specified position, adjust spike height, make blower fan rectangle exhaust outlet lower end surface apart from face height H=0.70m, to guarantee that castor departs from working surface.
In sum, chassis dynamometer is as a kind of automobile actual travel road simulation system, the test vehicle head-on wind field environment being subject to when blower fan can be used to simulated automotive road driving that heads on, for engine compartment provides refrigerating function, makes test vehicle operating conditions more realistic.Meanwhile, head-on blower fan is axial fan, in its running, can produce strong noise, can worsen indoor noise environment, brings harmful effect to staff.Adopt the dissipative muffler principle blower fan noise reduction that heads on, when seeing through interior perforation back-up ring 20, sound wave enters in porous sound absorption silk floss 21, when sound wave is propagated in sound-absorbing material, utilize tribology principle acoustic energy is converted into heat energy and dissipates, thereby realize the head-on noise reduction object of blower fan.For convenient head-on movement and the use of blower fan, adopt castor mechanism can facilitate the movement of blower fan, use spike mechanism can guarantee that blower fan realizes the steadiness of blower fan in the time of the state of use.
Above embodiments of the invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variation and improvement etc. of doing according to the scope of the invention, within all should still belonging to this patent covering scope.
Claims (10)
1. the low noise blower fan that heads on for indoor vehicle test, is characterized in that: comprise casing, motor, impeller, sound absorber and protective net; Described casing comprises intake grill and exhaust outlet, is followed successively by afflux district, movable vane district, acoustic attenuation zone and wind outlet area from intake grill to exhaust outlet, and the section area in each interval successively decreases, the just front portion to test vehicle of described wind outlet area end; Described motor is fixed in casing inside, and motor output shaft, afflux district, movable vane district and acoustic attenuation zone coaxial line; Described impeller comprises wheel hub and blade, and described wheel hub is fixed on motor output shaft, and described blade is circumferentially evenly arranged and is fixed on wheel hub; Described sound absorber is positioned at acoustic attenuation zone; Described protective net comprises afflux protective net and air-out protective net, and described afflux protective net is fixed in the intake grill position in afflux district, and described air-out protective net is fixed in air outlet position place, wind outlet area.
2. the low noise according to claim 1 blower fan that heads on, is characterized in that: described casing is corrosion resistant plate welding body, and each interval is affixed by flange.
3. the low noise according to claim 1 blower fan that heads on, is characterized in that: the cross section of described afflux district, movable vane district and acoustic attenuation zone is for circular, and the cross section of described wind outlet area is uniform section rectangle; Between described acoustic attenuation zone and wind outlet area, be provided with a translation field, enclosure interior cross section, described translation field is variable cross section, and described translation field one end section is connected in cross section altogether with cross section, acoustic attenuation zone, and the other end cross section is connected in cross section altogether with cross section, wind outlet area.
4. the low noise according to claim 3 blower fan that heads on, is characterized in that: described afflux district is horn-like structure, and reduces along air approach axis sectional area; Described movable vane district inner section is uniform section, and is total to cross section with afflux district end.
5. according to the blower fan that heads on of the low noise described in claim 1 or 3, it is characterized in that: the sound absorber in described acoustic attenuation zone is provided with interior perforation back-up ring, the tender outer back-up ring of porous sound absorption, and described acoustic attenuation zone inner section is uniform section.
6. the low noise according to claim 1 blower fan that heads on, is characterized in that: described motor is direct current variable frequency motor.
7. according to the blower fan that heads on of the low noise described in claim 1 or 6, it is characterized in that: described motor is fixed on a support, and described support welding is in casing inside.
8. the low noise according to claim 1 blower fan that heads on, is characterized in that: described blade is along its sense of rotation to antecurvature, and thickness from its root to end reduces gradually.
9. the low noise according to claim 1 blower fan that heads on, is characterized in that: described casing is fixed on fixing frame, and described fixing frame bottom is provided with spike or castor.
10. the low noise according to claim 1 blower fan that heads on, is characterized in that: described casing is fixed on fixing frame, and described fixing frame bottom is provided with spike and castor.
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| CN201410100221.6A CN103821742B (en) | 2014-03-18 | 2014-03-18 | Low-noise head-on fan for indoor vehicle test |
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| CN103821742B CN103821742B (en) | 2016-05-11 |
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Cited By (3)
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| CN110259731A (en) * | 2019-07-23 | 2019-09-20 | 山西省侯马市鑫丰康风机有限公司 | A method of reducing constructing tunnel propeller fan noise |
| CN110346146A (en) * | 2019-07-31 | 2019-10-18 | 中国航发沈阳发动机研究所 | A kind of experimental cabin for main chamber low-temperature test |
| CN111105663A (en) * | 2020-01-19 | 2020-05-05 | 海润新风（重庆）智能技术有限公司 | Silencing non-induction-port product test prototype |
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