CN207647806U - High-speed electric expreess locomotive and electric tool - Google Patents
High-speed electric expreess locomotive and electric tool Download PDFInfo
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- CN207647806U CN207647806U CN201721444013.3U CN201721444013U CN207647806U CN 207647806 U CN207647806 U CN 207647806U CN 201721444013 U CN201721444013 U CN 201721444013U CN 207647806 U CN207647806 U CN 207647806U
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Abstract
The utility model is related to a kind of high-speed electric expreess locomotive and electric tool, including shell and armature, the armature is disposed in the housing；Further include fan, shaft drives the fan rotation in the armature；The fan includes wheel hub and several flabellums；The flabellum quantity n is integer, and meets 12≤n≤50 piece；The flabellum quantity n and flabellum rotating speed R and human ear perceived frequency U minimum to ultrasonic waveminIt is associated, and meet the following conditions：R/60 × n ＞ Umin.In above-mentioned high-speed electric expreess locomotive, the flabellum quantity of fan is controlled by meeting the minimum sensing range of motor speed and ultrasonic wave, other than the range for surmounting auditory perceptual to reach aerodynamic noise by using the technology of encryption flabellum matching motor speed, high-speed electric expreess locomotive noise is reduced by generating supersonic band air-flow, substantially reduces the sharp aerodynamic noise of high frequency.
Description
Technical field
The utility model is related to power tools technology fields, more particularly to a kind of high speed with ultrasonic wave fan structure
Motor and electric tool with the high-speed electric expreess locomotive.
Background technology
Electric tool be it is a kind of power is used as by motor or electromagnet, pass through transmission mechanism and drive work head progress operation
Hand-held or removable dynamic formula mechanized tool.Electric tool is due to its light structure, easy to carry, extensive use
In all trades and professions.
Electric tool during the work time, can bring a large amount of noise.According to statistics, the noise meeting that common grass trimmer generates
It travels within the scope of about 150 meters, and the noise that gasoline grass trimmer generates can travel within the scope of about 400 meters, miscellaneous noise is not
The environment for only influencing user itself, also affects the quiet time of having a rest of periphery neighbours.
The noise that electric tool generates during the work time can substantially be divided into body structure surface vibrating noise and aerodynamic noise.It is logical
Often, people lay particular emphasis on research vibrating noise, less for the research report of aerodynamic noise.When motor runs at high speed, pneumatically make an uproar
Sound seems especially prominent, becomes the major part of noise source and the difficult elimination of comparison.Aerodynamic noise is substantially aerodynamic noise,
The main reason for generation be because there is elasticity and inertia in air, the rotation of flabellum can cause the pulsation of atmospheric pressure or density and
It is caused.So the aerodynamic noise master in electric tool is derived from motor.However high-speed electric expreess locomotive can be in the high frequency model that human ear can perceive
It encloses and generates very sharp aerodynamic noise, largely effect on the health of operating personnel or surrounding people.
Utility model content
Based on this, it is necessary to which the high-frequency range that can be perceived in human ear for existing high-speed electric expreess locomotive generates very sharp gas
The problem of dynamic noise, provide a kind of ultrasonic wave fan structure, high-speed electric expreess locomotive and the electric tool of high-speed electric expreess locomotive.
A kind of high-speed electric expreess locomotive, including：
Shell and armature, the armature are disposed in the housing；
Further include fan, shaft drives the fan rotation in the armature；The fan includes wheel hub and is set to described
Several flabellums of wheel hub periphery；The flabellum quantity n is integer, and meets 12≤n≤50 piece；The flabellum quantity n and fan
Leaf rotating speed R and human ear perceived frequency U minimum to ultrasonic waveminIt is associated, and meet the following conditions：
R/60 × n ＞ Umin
Wherein, the unit of flabellum rotating speed R is rpm.
In above-mentioned high-speed electric expreess locomotive, the flabellum quantity of fan by meet the minimum sensing range of motor speed and ultrasonic wave come
It controls, other than the range for surmounting auditory perceptual to reach aerodynamic noise by using the technology of encryption flabellum matching motor speed,
High-speed electric expreess locomotive noise is reduced by generating supersonic band air-flow, substantially reduces the sharp aerodynamic noise of high frequency.
Human body perceived frequency U minimum to ultrasonic wave in one of the embodiments,minNot less than 20000Hz.
Ranging from 24000rpm~100000rpm of the flabellum rotating speed R in one of the embodiments,.Further,
The flabellum rotating speed R is 38 × 103Rpm~100 × 103rpm。
The high-speed electric expreess locomotive is applied to electric tool in one of the embodiments,.
The high-speed electric expreess locomotive is alternating current generator or inner-rotor brushless direct current generator in one of the embodiments,.
Further include in one of the embodiments,：
Wheel disc, the wheel disc are in contact from wheel hub periphery elongation moulding and with the flabellum.
The arrangement mode of several flabellums is along the radially-arranged single layer row of the wheel hub in one of the embodiments,
Row mode or multilayer arrangement mode.
The arrangement mode of several flabellums is radial along the wheel hub in one of the embodiments, and is distributed with one heart
Multilayer arrangement mode, and every layer of flabellum quantity nxAnd flabellum rotating speed R and human ear perceived frequency U minimum to ultrasonic waveminIt is associated,
It is satisfied by the following conditions：R/60×nx＞ Umin。
The flabellum quantity is non-prime in one of the embodiments,.
The flabellum edge is without tooth or gap structure in one of the embodiments,.
Several flabellums, which use, in one of the embodiments, is equally spaced.
The connection type of the fan and rotor in the armature is interference fit in one of the embodiments,.
A kind of electric tool, including above-described high-speed electric expreess locomotive.
The electric tool includes garden instrument and floor care tool in one of the embodiments,.
Description of the drawings
Fig. 1 is the partial structural diagram of the high-speed electric expreess locomotive of an embodiment of the utility model；
Fig. 2 is the schematic diagram of the fan structure of another embodiment of the utility model；
Fig. 3 is the partial structural diagram of the high-speed electric expreess locomotive of the another embodiment of the utility model；
Fig. 4 is the noise spectrum comparison diagram of three kinds of fan structures.
In figure：
1, fan, 2, the first rotor, 3, first rotating shaft, 4, commutator, 101, wheel hub, 102, flabellum.
Specific implementation mode
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The preferred embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiment described herein.Make to the utility model on the contrary, purpose of providing these embodiments is
The understanding of disclosure is more thorough and comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement are for illustrative purposes only.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with the technology for belonging to the utility model
The normally understood meaning of technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein includes
Any and all combinations of one or more relevant Listed Items.
As shown in Figs. 1-3, a kind of high-speed electric expreess locomotive, including shell (not shown) and armature, the armature are set to the shell
It is interior.
In the present embodiment, the high-speed electric expreess locomotive can be brushless motor.The armature may include that the first stator (is not schemed
Show), the first rotor 2, first rotating shaft 3 and commutator 4, the first rotor 2 can be sheathed in the first rotating shaft 3, described
One stator can be sheathed in the shell, and can be set between the shell and the first rotor 2, and the commutator 4 is set to
It is electrically connected in the first rotating shaft 3 and with first stator.The structure size of first stator and the first rotor 2 can be normal
Rule design.
In another embodiment, the high-speed electric expreess locomotive can be alternating current generator.The armature may include the second stator, second
Rotor and the second shaft, second rotor can be sheathed in second shaft, and second stator can be sheathed on the shell
In vivo, it and can be set between the shell and second rotor.Second stator may include stator core and be wound in determine
Stator winding on sub- iron core.The rotor windings that second rotor may include rotor core and be wound on rotor core.Institute
It can be conventional design to state the second stator and bitrochanteric structure size.In other embodiments, the high-speed electric expreess locomotive may be used also
For brush direct current motor or other kinds of motor.
In addition, above-mentioned high-speed electric expreess locomotive further includes bearing, the bearing fixes the armature on the housing.Above-mentioned height
Speed motor further includes the protection cap, and the protection cap is sheathed on the armature and for the in fixed armature the bitrochanteric twoth
End.
Above-mentioned high-speed electric expreess locomotive, further includes fan 1, and shaft drives the fan 1 to rotate in the armature.Specifically, described
Fan 1 is sheathed on shaft in the armature.As illustrated in fig. 1 and 2, the fan 1 may include wheel hub 101 and outside the wheel hub
Several flabellums 102 enclosed.Wherein, the flabellum quantity of the fan 1 in Fig. 1 is 41, and the flabellum quantity of the fan 1 in Fig. 2 is
39.
The fan 1 and the bitrochanteric connection type of the first rotor 2 or the in the armature in one of the embodiments,
It can be interference fit.
In said fans structure, may also include wheel disc, the wheel disc from the peripheral elongation moulding of the wheel hub 101 and with it is described
Flabellum 102 is in contact.
The arrangement mode of several flabellums 102 is radially-arranged along the wheel hub 101 in one of the embodiments,
Monolayer arrangement.The arrangement mode of several flabellums 102 is radial along the wheel hub 101 in one of the embodiments,
And the multilayer arrangement mode being distributed with one heart, and every layer of flabellum quantity nxAnd flabellum rotating speed R and human ear perception frequency minimum to ultrasonic wave
Rate UminIt is associated, it is satisfied by the following conditions：R/60×nx＞ Umin.It so can ensure that every layer of flabellum can completely eliminate frequency multiplication
Noise, to realize that the elimination of the frequency multiplication noise of entire fan, noise reduction are good.
Fan is the important component of high-speed electric expreess locomotive, plays the role of cooling motor.Fan is together with the shaft in armature
, and constantly there is falling off, generate and rupturing for whirlpool in high speed rotation, blade surface pressure cycle pulsation, formed sharp pneumatic
Noise.
The size of aerodynamic noise is in fact related to the structure of the rotating speed of motor, internal air channel structure and fan etc..Pneumatically
Noise can be divided into Rotation Noise and Kuanping Terrane, and Rotation Noise is the major part of aerodynamic noise.Rotation Noise generates main
The reason is that can cause caused by the pulsation of atmospheric pressure or density since air has elasticity and inertia, the rotation of flabellum.Cause
This, fan structure design especially blade structure design is most important for reducing Rotation Noise.
About fan structure design, researcher mainly fan type, fan blades shape design, flabellum not equidistantly distributed,
Trepanning or notch in the setting of every flabellum different angle, flabellum, the thickness for reducing flabellum etc. etc. are largely studied, from
It fundamentally wants to reduce or eliminate noise.But it and is not based on ultrasonic frequency range, rotating speed and lobe numbers and comes from root
It is further conducted a research on this.
In this regard, we are based on ultrasonic frequency range, and the relationship of audio frequency, rotating speed and lobe numbers is combined, to adjust gas
The frequency of dynamic noise, other than the range for making aerodynamic noise be more than auditory perceptual by adjusting flabellum quantity.In general, current human ear energy
The audio frequency range enough perceived is that 20~20KHz generates ultrasonic wave, human ear at this time when audio frequency range is more than 20KHz
It can not perceive.
The flabellum quantity of fan is set as n, wherein n is integer.The flabellum rotating speed of fan is set as R, unit be rpm (turn/
Point), the frequency noise of each flabellum is R/60 (Hz), sets human ear to the minimum perceived frequency of ultrasonic wave as Umin；
When flabellum quantity n meets condition：
R/60 × n ＞ Umin (1)
Currently, usual UminFor 20KHz, i.e., the harmonic frequency of the flabellum of fan is more than 20KHz, fan at this time it is pneumatic
Noise is more than to think other than appreciable range.If but the variation with human ear to ultrasonic wave sensing capability, UminIt may not
It is limited to 20KHz, may is more than 20KHz, the condition that n at this time is met also does corresponding adjustment.
Fan leaf n meets condition concretely at this time：
R/60 × n ＞ 20 × 103 (2)
In high-speed electric expreess locomotive, fan high speed rotation together with the shaft in armature.In one embodiment, the rotating speed of motor
Typically up to 24 × 103Rpm~100 × 103Rpm, in order to meet above formula (2), then flabellum quantity n is 12~50 at this time
Piece.
So 12≤n≤50 piece of flabellum quantity n satisfactions in fan structure, the flabellum quantity n and high-speed electric expreess locomotive
Flabellum rotating speed R is associated, and meets the following conditions simultaneously：R/60 × n ＞ Umin(20×103Hz), you can reduce the sharp gas of high frequency
Dynamic noise.
In the present embodiment, the blade structure for meeting conditions above can be universal fan leaf or blade.Example
If blade structure can be radial blade, antecurvature formula centrifuge blade, swept-back centrifuge blade or mixed flow, axial blade.
In the present embodiment, prime number is not required for for flabellum quantity, quantity can be prime number or non-prime.
The above research based on this case, in the fan for meeting conditions above, when flabellum quantity is to certain amount, the vibration distribution of blade
Mode belongs to high-order, so the fan of non-prime quantity can also reach good noise reduction.
In the present embodiment, can be conventional blade structure to the blade structure for meeting conditions above, it may be unnecessary to fan
Impeller structure carries out complicated structure design.Specifically, the flabellum edge can be without tooth or gap structure.In addition, several fans
Blade, which can be, to be equidistantly uniformly distributed.Calculating and the design procedure to blade structure can so be simplified, application range is wider.Certainly,
In order to obtain further noise reduction, the blade structure can be also unconventional blade structure, may be designed as band tooth or with scarce
The structures such as mouth or Unequal distance non-uniform Distribution.
In the present embodiment, the maximum outside diameter of the fan is 55~65mm；The maximum outside diameter of the fan/axial direction is long
Degree ratio can be 4~6:1.Preferably, the maximum outside diameter of the fan is 62mm；Maximum outside diameter/axial length of the fan
Ratio can be 6:1.
In the present embodiment, the thickness of flabellum can be 0.5mm~2mm.Preferably, the thickness of flabellum be 1.2mm~
1.8mm.In addition, the mounted angle of flabellum can be 0~90 degree, it is preferred that the mounted angle of flabellum is 90 degree.In addition, the fan
Impeller structure can also do some other designs based on the prior art, and details are not described herein.
Conditions above is verified below by noise test：
Spectrum measurement environment is noise reduction room environmental, and test condition is noise test, tests rotating speed 36 × 103rpm.Using three
A flabellum model, flabellum A are 31, and flabellum B is 39 (Fig. 2), and flabellum C is 41 (Fig. 1), to three flabellum sample carry out sound
Pressure and octave test, and draw its noise spectrum (as shown in Figure 4).
Referring to the noise pattern of Fig. 4 and its close-up schematic view it is found that flabellum B and flabellum C do not have wave crest, frequency multiplication
Noise peak is eliminated, and flabellum A there are still wave crest, frequency multiplication noise peak is not eliminated.
In addition, from overall diagram, the noise amplitude of high band is substantially reduced, and the size that noise reduces amplitude is flabellum
C ＞ flabellum B ＞ flabellum A, illustrate that flabellum B and flabellum C can also reduce high frequency overall noise to a certain extent.
It is 36 × 10 in rotating speed for the above noise test as a result, we are verified by formula (2)3When rpm,
Only flabellum B (39) and flabellum C (41) meets condition, and flabellum A (31) and the condition for being unsatisfactory for above-mentioned formula (2), because
This flabellum A can not theoretically reduce aerodynamic noise.This is consistent with the result of the above noise test.
In another embodiment, ranging from the 38 × 10 of the flabellum rotating speed R3Rpm~100 × 103Rpm, in order to meet
Above formula (2), then flabellum quantity n is 12~31 at this time.At this point, the flabellum quantity n in fan structure meets 12≤n
≤ 31, and meet the following conditions simultaneously：R/60 × n ＞ Umin(20×103Hz), you can reduce the sharp aerodynamic noise of high frequency.
Above-mentioned ultrasonic wave fan structure, flabellum quantity n is by meeting the minimum perception of motor speed and human ear to ultrasonic wave
Range controls, and matches the technology of motor speed by using encryption flabellum to reach the range that aerodynamic noise surmounts auditory perceptual
In addition, high-speed electric expreess locomotive noise is reduced by generating supersonic band air-flow, substantially reduces the sharp aerodynamic noise of high frequency.
It is discussed by above theoretical and experiment, find encryption flabellum and coordinates the minimum perception model of motor speed and ultrasonic wave
Enclose the purpose that can be realized and reduce sharp aerodynamic noise.However in order to further increase and improve the overall noise of flabellum, also
It can be on the basis of the technical program, further by optimizing design to blade structure.
In a particular application, the above fan or ultrasonic wave fan structure are applied to electric tool.The electric tool can wrap
The above ultrasonic wave fan structure or high-speed electric expreess locomotive are included, such as structure as shown in Figure 1 can be applied to angle grinder tool, and such as Fig. 3
Shown in structure can be applied to electric hammer tool.Electric tool therein is not limited to industrial circle electric tool (such as angle grinder
Deng), apply also for other non-industrial circles, such as garden instrument (such as grass trimmer) and floor care tool (such as dust catcher
Deng).
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of high-speed electric expreess locomotive, including：
Shell and armature, the armature are disposed in the housing；
It is characterized in that,
Further include fan, shaft drives the fan rotation in the armature；The fan include wheel hub and be set to the wheel hub
Several flabellums of periphery；The flabellum quantity n is integer, and meets 12≤n≤50 piece；The flabellum quantity n and fan blade rotating
Fast R and human ear perceived frequency U minimum to ultrasonic waveminIt is associated, and meet the following conditions：
R/60 × n ＞ Umin
Wherein, the unit of flabellum rotating speed R is rpm.
2. high-speed electric expreess locomotive according to claim 1, which is characterized in that ranging from the 24 × 10 of the flabellum rotating speed R3Rpm~
100×103rpm。
3. high-speed electric expreess locomotive according to claim 1, which is characterized in that the high-speed electric expreess locomotive is applied to electric tool.
4. high-speed electric expreess locomotive according to claim 1, which is characterized in that the high-speed electric expreess locomotive be alternating current generator or internal rotor without
Brushless motor.
5. high-speed electric expreess locomotive according to claim 1, which is characterized in that further include：
Wheel disc, the wheel disc are in contact from wheel hub periphery elongation moulding and with the flabellum.
6. according to any high-speed electric expreess locomotives of claim 1-5, which is characterized in that the arrangement mode of several flabellums is edge
The radially-arranged monolayer arrangement of the wheel hub or multilayer arrangement mode.
7. according to any high-speed electric expreess locomotives of claim 1-5, which is characterized in that the arrangement mode of several flabellums is along institute
State the multilayer arrangement mode that wheel hub is radial and is distributed with one heart, and every layer of flabellum quantity nxAnd flabellum rotating speed R and human ear are to ultrasonic wave
Minimum perceived frequency UminIt is associated, it is satisfied by the following conditions：R/60×nx＞ Umin。
8. high-speed electric expreess locomotive according to claim 7, which is characterized in that the connection side of the fan and rotor in the armature
Formula is interference fit.
9. a kind of electric tool, which is characterized in that including：
Any high-speed electric expreess locomotives of claim 1-8.
10. electric tool according to claim 9, which is characterized in that the electric tool includes garden instrument and ground
Plate care implement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721444013.3U CN207647806U (en) | 2017-11-02 | 2017-11-02 | High-speed electric expreess locomotive and electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721444013.3U CN207647806U (en) | 2017-11-02 | 2017-11-02 | High-speed electric expreess locomotive and electric tool |
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| Publication Number | Publication Date |
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| CN207647806U true CN207647806U (en) | 2018-07-24 |
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ID=62885183
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| CN201721444013.3U Active CN207647806U (en) | 2017-11-02 | 2017-11-02 | High-speed electric expreess locomotive and electric tool |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751256A (en) * | 2017-11-02 | 2019-05-14 | 苏州宝时得电动工具有限公司 | High-speed motor and electric tool |
| WO2020192753A1 (en) * | 2019-03-27 | 2020-10-01 | 苏州宝时得电动工具有限公司 | Garden blower |
-
2017
- 2017-11-02 CN CN201721444013.3U patent/CN207647806U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751256A (en) * | 2017-11-02 | 2019-05-14 | 苏州宝时得电动工具有限公司 | High-speed motor and electric tool |
| WO2020192753A1 (en) * | 2019-03-27 | 2020-10-01 | 苏州宝时得电动工具有限公司 | Garden blower |
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