CN105041715B - A kind of mechanical device for automatically adjusting axial-flow fan blade pitch - Google Patents
A kind of mechanical device for automatically adjusting axial-flow fan blade pitch Download PDFInfo
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- CN105041715B CN105041715B CN201510474258.XA CN201510474258A CN105041715B CN 105041715 B CN105041715 B CN 105041715B CN 201510474258 A CN201510474258 A CN 201510474258A CN 105041715 B CN105041715 B CN 105041715B
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- connecting shaft
- wheel hub
- gear
- mechanical device
- automatically adjusting
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Abstract
Type of the present invention is related to a kind of mechanical device for automatically adjusting axial-flow fan blade pitch.The device that purpose is to provide should be able to make axial flow blower noise reduction to greatest extent under different operating modes.Technical scheme is：A kind of mechanical device for automatically adjusting axial-flow fan blade pitch, including wheel hub coaxially arranged with casing in fan casing, it is distributed in some blades on wheel hub outer circumference surface and the PLC equipped with wireless launcher；It is characterized in that several described blades are fixed on corresponding circular arc slide plate one by one respectively, all circular arc slide plates are slideably sequentially mounted on wheel hub outer circumference surface and in the chute of circumferential directions, the another governor motion one-to-one corresponding for having respective amount respectively drives and controls circular arc slide plate to be slided in chute, so as to adjust the pitch of blade.
Description
Technical field
The invention belongs to axial flow blower noise reduction field, more particularly to a kind of machinery for automatically adjusting axial-flow fan blade pitch
Device.
Background technology
The purposes of axial flow blower is very wide, the air pressure of the either radiator fan of personal computer, or jumble jet
Contracting machine, is all application of the axial flow blower in different field.These blower fans can also cause disturbing for air while air flow is made
Move and produce aerodynamic noise.In axial flow blower high-speed rotation, because rotating vane periodically hits air particle, cause sky
The crest frequency noise of the series of discrete that gas periodic pressure is pulsed and produced is more continuous than what vortex and vortex breakdown were excited
Wideband noise is more dominant and bigger to the harm of human body.Therefore, it is axial flow blower drop to reduce discrete crest frequency noise
The emphasis made an uproar.
Research shows that irregular pitch Leaf positional distribution passes through frequency and its harmonic wave due to reducing periodic excitation to blower fan
With modulating action.By making the angle between two adjacent blades unequal, the airborne noise peak value produced during rotation
Other frequencies can be distributed to, it is to avoid the peak value of some wavelength coverages, so as to reducing total level of noise.In addition, no
The relative change rate of equal pitch and equal pitch can't produce big influence interior in a big way to aerodynamic performance, therefore,
The optimal distribution mode of vanepiston can neatly be selected.
Root it was found that have been obtained for calculate vanepiston optimal distribution method, the distribution mode that the method is tried to achieve, no
Only can to greatest extent reduce discrete peaks frequency noise, moreover it is possible to the barycenter for making impeller overall be still located at the center of rotary shaft and
There is no the rotary vibration of bias.
However, with the change of rotation speed of fan, the vanepiston optimal distribution mode that the above method is obtained can also change.
In real work, the rotating speed of axial flow blower needs to change as requested, but the pitch of axial-flow fan blade has been consolidated in processing
Fixed, this just makes the vanepiston tried to achieve under rated speed optimal distribution mode possible and non-optimal solution under other operating modes.Therefore,
The axial flow blower that vanepiston is fixed cannot meet under various operating modes can noise reduction to greatest extent requirement.
The content of the invention
The purpose of the present invention is to overcome the shortcomings of above-mentioned background technology, there is provided one kind automatically adjusts axial-flow fan blade pitch
Mechanical device.The device should be able to make axial flow blower noise reduction to greatest extent under different operating modes.
The present invention provide technical scheme be：A kind of mechanical device for automatically adjusting axial-flow fan blade pitch, including peace
The wheel hub coaxially arranged with casing, some blades being distributed on wheel hub outer circumference surface and equipped with wireless in fan casing
The PLC of emitter；It is characterized in that several described blades are fixed on corresponding circular arc slide plate one by one respectively, Suo Youyuan
Arc slide plate is slideably sequentially mounted on wheel hub outer circumference surface and in the chute of circumferential directions, another difference
The governor motion for having respective amount corresponds and drives and control circular arc slide plate to be slided in chute, so as to adjust the section of blade
Away from；
The governor motion includes being fixed on internal gear section, the end gear of driving internal gear section below circular arc slide plate
The regulation motor of group, the train of reduction gears for driving end gear train and driving train of reduction gears；The regulation motor is according to nothing
The PLC instruction works that line emitter sends.
The retarding stage that the train of reduction gears is connected in series including several；Each retarding stage is coaxial by connecting shaft, difference
It is connected to path external gear and big footpath the internal gear composition at connecting shaft two ends；Big footpath internal gear wherein in chopped-off head retarding stage is by adjusting
Little gear on section motor output shaft is driven, and the path external gear in remaining retarding stage is used in the adjacent next retarding stage of driving
Big footpath internal gear.
The end gear train is made up of connecting shaft and coaxially connected external gear and internal gear at connecting shaft two ends.
The connecting shaft in connecting shaft and end gear train in described each retarding stage can by several connecting shaft supports
It is distributed on rotatably about the axis on wheel hub inner peripheral surface；The axis of connecting shafts at different levels is respectively positioned on the same circle coaxial with hub axis
On side face；Ensure every grade of barycenter of several connecting shaft supports in hub axis, prevent the revolution that overall bias causes and shake
Dynamic problem.
Circumferentially direction is uniformly arranged on the dividing plate in wheel hub described several regulation motors；The respective amount subtracts
Circumferentially direction is evenly distributed on the connecting shaft support in wheel hub fast gear train.
Operation principle of the invention is as follows：
Switch on power, rotor electric machine drives hub rotation；According to the change of operating mode, calculated respectively by the program in PLC
The optimal distribution method of individual blade, and the rotating speed of regulation motor and the gearratio of transmission mechanism are combined, by direction of rotation and rotation
The signal of time is wirelessly transmitted to corresponding regulation motor, so as to start the pinion rotation that regulation motor makes on its output shaft；
The multi-stage speed-reducing of train of reduction gears and end gear train is then passed through, imparts power to be fixed on circular arc slide plate by linkage section
The internal gear section of lower section, orders about circular arc slide plate and is slided in the chute on wheel hub outer circumference surface, i.e., to being fixed on circular arc slide plate
The pitch of blade adjusted.When the position that blade movement to program is required, corresponding regulation motor stops operating.From
And realization automatically adjusts axial-flow fan blade pitch, the purpose of noise reduction to greatest extent.
The beneficial effects of the invention are as follows：Due to vanepiston can be automatically adjusted according to different operating modes, so as to reduce
Prevailing discrete peaks frequency noise in aerodynamic noise, makes the means of noise reduction more flexible；Additionally, whole regulation process is received
Pre-set programs are controlled, and completely without manual operation, not only adjust laborsaving convenience, moreover it is possible to ensure degree of regulation, are met vast
The need for user.
Brief description of the drawings
Fig. 1 is the schematic perspective view (fan casing office sectional view) of mounting structure of the present invention.
Fig. 2 is that the gear-driven schematic diagram of hub interior of the present invention (cut the circular hole on connecting shaft support open and remove by ladder
One transmission mechanism of blade).
Fig. 3 is the schematic diagram (ladder cuts the circular hole on connecting shaft support open) of wheel hub structure of the present invention.
Fig. 4 is the structural representation of blade-section of the present invention.
Fig. 5 is the structural representation of end gear train of the present invention.
Fig. 6 is the structural representation of any retarding stage in train of reduction gears of the present invention.
Fig. 7 is the schematic flow sheet of present invention regulation control.
Specific embodiment
The embodiment is further illustrated below in conjunction with the accompanying drawings.
As Figure 1-Figure 2, a kind of mechanical device for automatically adjusting axial-flow fan blade pitch is (with 5 blade axial-flow blower fans
As example), including fan casing 1, rotor electric machine 2, electric machine support 3, wheel hub 4, blade 5, circular arc slide plate 6, dividing plate 7, regulation electricity
Machine 8, little gear 9, train of reduction gears 10, bearing 11, connecting shaft support 12, end gear train 13, linkage section 14, internal gear section 15.
As shown in figure 1, rotor electric machine 2 is fixed on the inner chamber of fan casing 1 by electric machine support 3；One end of wheel hub 4 is fixed
(ensure that wheel hub 4 is coaxial with blower fan runner) on the output shaft of rotor electric machine 2, and driven by rotor electric machine；5 points of several blades
On the outer circumference surface of wheel hub 4, rotor electric machine controls the rotation of wheel hub 4 to cloth.Above is the structure of conventional axial flow blower.
Improvement of the invention is：Described several blades 5 are separately fixed on corresponding circular arc slide plate 6, and circular arc slide plate 6 can
(chute 4-2 is arranged around outer circumference surface) is removably mounted within the chute 4-2 on the outer circumference surface of wheel hub 4, separately there is a regulation
Mechanism drives and controls circular arc slide plate 6 that (circumferencial direction slip) is slided in chute 4-2, so as to adjust the pitch of blade 5.
As shown in Fig. 4, Fig. 2：Internal gear section 15 is fixed on the lower section of circular arc slide plate 6 by linkage section 14；End gear train 13
Engage and drive internal gear section, train of reduction gears 10 then to drive end gear train, regulation motor 8 is further through fixed on its output shaft
Little gear 9 drive train of reduction gears.
As shown in Figure 3, Figure 4：Uniform the circumferentially opening 4-1 in direction on the outer circumference surface of wheel hub 4；Linkage section 14 is located at
The underface upstream position of circular arc slide plate 6, through after the opening 4-1 on the surface of wheel hub 4, upper and lower ends respectively connected circular arc slide plate 6
With internal gear section 15.
As shown in Figure 5：The two ends gear of end gear train 13 is connected with connecting shaft 13-3, and one end is external gear 13-1, with
Internal gear section 15 is engaged, and the other end is internal gear 13-2, is engaged with the path external gear 10-1 in final reduction level.
As shown in Figure 6：The structure all same of each retarding stage of train of reduction gears 10, is use and is connected by connecting shaft 10-3
Connect the structure of two ends gear (path external gear 10-1 and big footpath internal gear 10-2)；Wherein, one end of final reduction level is small
Footpath external gear 10-1 is engaged with the internal gear 13-2 of end gear train 13, and big footpath internal gear 10-2 and the upper level of the other end slow down
The path external gear 10-1 engagements of level；In chopped-off head retarding stage, the big footpath internal gear of path external gear 10-1 and next stage retarding stage
10-2 is engaged, and big footpath internal gear 10-2 is engaged with little gear 9 fixed on the output shaft of regulation motor 8.So as in limited space
Inside increase gearratio to greatest extent, improve the degree of regulation of regulation motor 8.The series of deceleration determines as needed, of the invention
Embodiment is using 4 grades of decelerations.
As shown in Fig. 5-Fig. 6：Two kinds of connecting shaft 10-3 and connecting shaft 13-3 of gear are fixed in two ends respectively, respectively by bearing
11 be arranged on connecting shaft support 12 on circular hole in (outer ring of bearing 11 is fixed in the circular hole on connecting shaft support 12, the inner ring of bearing 11
Middle part with connecting shaft 10-3 or connecting shaft 13-3 is fixed).
As shown in Fig. 2-Fig. 3, several connecting shaft supports 12 in each train of reduction gears are arranged in the inner peripheral surface of wheel hub 4
On, the axis (the axis hole axis on connecting shaft supports 12 i.e. at different levels) of connecting shafts at different levels is respectively positioned on the same circle coaxial with hub axis
It is on side face and overall around the same equal angles that rotate in a circumferential direction, it is ensured that the barycenter of several connecting shaft supports 12 in hub axis,
Prevent the rotary vibration problem that overall bias causes；Dividing plate 7 is located at the lumen downstream of wheel hub 4 (right side of Fig. 1), for fixing
Regulation motor 8, the output shaft of regulation motor 8 is passed through on dividing plate behind the hole of circumference uniform distribution, and little gear 9 is fixed on the output shaft again
And engaged with the big footpath internal gear 10-2 in chopped-off head retarding stage.
In a word, 5 blades in the present embodiment are driven one by one respectively by 5 governor motions, and these governor motions are distributed on
Hub inner lumen simultaneously keeps the barycenter after synthesis to be located in hub axis, to keep moving equilibrium.
The anglec of rotation of regulation motor 8 is programmed.The program goes out current working lower blade according to rotation speed of fan tentative calculation
(barycenter that the result being calculated can make impeller overall is still located at the center of rotary shaft without occurring to the optimal distribution method of pitch
Eccentric rotary vibration), send rotation letter to each regulation motor 8 with reference to the gearratio and the rotating speed of regulation motor 8 for slowing down
Number, by the regulation of the motion transmission control pitch of blade 5 of the governor motion.
As shown in fig. 7, described automatic control program is programmed in PLC, specific steps include
1) the number B of blade 5 and the rotating speed n of rotor electric machine 2 of input axial flow blower；
2) coordinate system is set up by the origin of coordinates of the central point of axial flow blower wheel hub 4, presets B-2 blade 5 in coordinate system
The angle, θ of middle present positioni, wherein, the θiIt is the angle of axial flow blower i-th blade present position in a coordinate system, presets
θiIn [θi,min,θi,min+Δθ,θi,min+2Δθ,....,θi,max] in value, wherein, the θi,minAnd θi,maxIt is respectively axle
The modulated mechanism's adjustable range of flow fan i-th blade limits the minimum angles and maximum angle of present position in a coordinate system,
Δ θ is the tentative calculation step-length of blade angle of present position in the coordinate system, by combining B-2 blade 5 in a coordinate system
The angle, θ of present positioni, obtain one group of location mode [θ of B-2 blade 51,θ2,....,θB-2]；
3) basisWithCalculate remaining two
The angle, θ of individual blade present position in the coordinate systemB-1And θB, such Leaf positional distribution makes irregular pitch blade blower fan leaf
Take turns overall barycenter to be still located in hub axis, be not in eccentric vibrating during rotation；
4) θ is judgedB-1And θBWhether θ is met respectivelyB-1,min≤θB-1≤θB-1,maxAnd θB,min≤θB≤θB,max, if so, then after
Continuous next step, if it is not, repeat step 2)；
5) using the angle, θ of each present position of blade 5 of axial flow bloweri, calculate k subharmonic sound when axial flow blower rotates
Press the amplitude A of signalk, wherein, the k is related to the rotating speed n of axial flow blower,
6) the difference DELTA SPL of irregular pitch axial flow blower and the rotational noise sound pressure level of equal pitch axial flow blower is calculated, its
In,
7) angle [θ of storage Δ SPL and each present position of blade 5 of corresponding axial flow blower1,θ2,....,θB]；
8) judge step 2) in B-2 blade present position in a coordinate system angle, θiAll combination [θ1,
θ2,....,θB-2] whether tentative calculation is finished, if so, then continue next step, if it is not, repeat step 2)；
9) the relatively Δ SPL of all storages and export Δ SPL it is maximum when each blade present position in a coordinate system angle
Degree [θ1,θ2,....,θB]；
10) the rotating speed n* of the regulation motor 8 and gearratio I of transmission mechanism is combined, rotation is sent to each regulation motor 8 respectively
Turn the wireless signal of direction and rotational time.
The above is a case study on implementation of the invention, not limits the scope of the claims of the invention.Therefore, every foundation
Technical spirit of the invention, simple modification and various similar changes are made to the present invention, are included in patent protection model of the invention
Within enclosing.
Claims (5)
1. a kind of mechanical device for automatically adjusting axial-flow fan blade pitch, including in fan casing (1) it is same with casing
The wheel hub (4) of axle arrangement, some blades (5) being distributed on wheel hub outer circumference surface and the PLC equipped with wireless launcher；Its
It is characterised by that several described blades are fixed on corresponding circular arc slide plate (6) one by one respectively, all circular arc slide plates can be slided
Sequentially it is mounted on wheel hub outer circumference surface and in the chute (4-2) of circumferential directions, separately there is correspondence respectively dynamicly
The governor motion of quantity corresponds and drives and control circular arc slide plate to be slided in chute, so as to adjust the pitch of blade；
The governor motion includes being fixed on internal gear section (15), the end gear train of driving internal gear section below circular arc slide plate
(13) train of reduction gears (10) for, driving end gear train and the regulation motor (8) for driving train of reduction gears；The regulation electricity
The PLC instruction works that machine sends according to wireless launcher.
2. the mechanical device for automatically adjusting axial-flow fan blade pitch according to claim 1, it is characterised in that：It is described to subtract
The retarding stage that fast gear train is connected in series including several；Each retarding stage by connecting shaft (10-3), be connected to connecting shaft one end
Path external gear (10-1) and be connected to the connecting shaft other end big footpath internal gear (10-2) composition；Wherein in chopped-off head retarding stage
Big footpath internal gear is driven by the little gear on regulation motor output shaft, and the path external gear in remaining retarding stage is used to drive phase
Big footpath internal gear in adjacent next retarding stage.
3. the mechanical device for automatically adjusting axial-flow fan blade pitch according to claim 2, it is characterised in that：The end
Gear train is by connecting shaft (13-3) and is connected to the external gear (13-1) of connecting shaft one end and is connected to the connecting shaft other end at end
Internal gear (13-2) composition.
4. the mechanical device for automatically adjusting axial-flow fan blade pitch according to claim 3, it is characterised in that：It is described every
The connecting shaft in connecting shaft and end gear train in individual retarding stage can be equal rotatably about the axis by several connecting shaft supports
Cloth is on wheel hub inner peripheral surface；The axis of connecting shafts at different levels is respectively positioned on the same periphery coaxial with hub axis.
5. the mechanical device for automatically adjusting axial-flow fan blade pitch according to claim 4, it is characterised in that：If described
Dry regulation motor is circumferentially uniformly arranged on the dividing plate (7) in wheel hub in direction；The train of reduction gears of the respective amount around
Circumferencial direction is evenly distributed on the connecting shaft support (12) in wheel hub.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510474258.XA CN105041715B (en) | 2015-08-05 | 2015-08-05 | A kind of mechanical device for automatically adjusting axial-flow fan blade pitch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510474258.XA CN105041715B (en) | 2015-08-05 | 2015-08-05 | A kind of mechanical device for automatically adjusting axial-flow fan blade pitch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105041715A CN105041715A (en) | 2015-11-11 |
| CN105041715B true CN105041715B (en) | 2017-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510474258.XA Expired - Fee Related CN105041715B (en) | 2015-08-05 | 2015-08-05 | A kind of mechanical device for automatically adjusting axial-flow fan blade pitch |
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| CN (1) | CN105041715B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107676284B (en) * | 2017-08-23 | 2020-04-14 | 太原理工大学 | Fan blade adjusting device, counter-rotating fan and fan blade adjusting method |
| CN111828385A (en) * | 2020-08-04 | 2020-10-27 | 徐州徐工挖掘机械有限公司 | Radiator fan blade adjustable device |
| CN114837993A (en) * | 2022-05-23 | 2022-08-02 | 安徽朗迪叶轮机械有限公司 | Double-layer axial flow fan blade |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3217808A (en) * | 1963-10-01 | 1965-11-16 | Dowty Hydraulic Units Ltd | Cooling fans |
| FR2473463A1 (en) * | 1979-10-25 | 1981-07-17 | Milloux Maurice | Variable pitch propeller for ship - runs in cowl with four blades rotating on radial pins actuated by lever |
| US5851131A (en) * | 1997-06-16 | 1998-12-22 | Land And Sea, Inc. | Self-adjusting variable pitch propeller |
| CN102203411A (en) * | 2008-09-25 | 2011-09-28 | 松基奥有限公司 | Device for adjusting the blade pitch of a wind generator |
| CN204942078U (en) * | 2015-08-05 | 2016-01-06 | 浙江理工大学 | A kind of mechanical device of automatic adjusting axle axial flow fan blade pitch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1888400A1 (en) * | 2005-06-09 | 2008-02-20 | Aimbridge Pty. Ltd. | Propeller for a marine propulsion system |
-
2015
- 2015-08-05 CN CN201510474258.XA patent/CN105041715B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3217808A (en) * | 1963-10-01 | 1965-11-16 | Dowty Hydraulic Units Ltd | Cooling fans |
| FR2473463A1 (en) * | 1979-10-25 | 1981-07-17 | Milloux Maurice | Variable pitch propeller for ship - runs in cowl with four blades rotating on radial pins actuated by lever |
| US5851131A (en) * | 1997-06-16 | 1998-12-22 | Land And Sea, Inc. | Self-adjusting variable pitch propeller |
| CN102203411A (en) * | 2008-09-25 | 2011-09-28 | 松基奥有限公司 | Device for adjusting the blade pitch of a wind generator |
| CN204942078U (en) * | 2015-08-05 | 2016-01-06 | 浙江理工大学 | A kind of mechanical device of automatic adjusting axle axial flow fan blade pitch |
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| Publication number | Publication date |
|---|---|
| CN105041715A (en) | 2015-11-11 |
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Granted publication date: 20170613 Termination date: 20180805 |