CN207961054U - Fan and micro-wave oven - Google Patents
Fan and micro-wave oven Download PDFInfo
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- CN207961054U CN207961054U CN201721929381.7U CN201721929381U CN207961054U CN 207961054 U CN207961054 U CN 207961054U CN 201721929381 U CN201721929381 U CN 201721929381U CN 207961054 U CN207961054 U CN 207961054U
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- fan
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- blade group
- wheel hub
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Abstract
The utility model discloses a kind of fan and micro-wave ovens, the fan (20) includes wheel hub (21) and the identical multiple blades (22) of shape, and the circumferential direction of outer ring (211) of multiple blades (22) along the wheel hub (21) is equidistantly spaced from and is formed along the axial direction of the wheel hub (21) and misplaced.In the fan of the utility model, by reasonably controlling dislocation distance of the blade along the axial direction of wheel hub, the fundamental frequency (i=1) of original fan can be distributed in different frequencies.Fortune is in this way to destroy fixed obstacle (such as holder of blade and upstream and downstream, transformer or frequency converter, magnetron etc.) generated air-flow covibration when interfering with each other, the distribution of energy is disperseed simultaneously, preferable control action is played to the discrete noise of the fan, furthermore it is also possible to so that the aeroperformance of fan is improved to a certain extent, the reduction of the final redistribution and total acoustic power grade for obtaining noise energy.
Description
Technical field
The utility model is related to household appliance technical fields, and in particular, to a kind of fan and micro-wave oven.
Background technology
Micro-wave oven is a kind of modernization cooking kitchen range with microwave heating of food.Microwave is a kind of electromagnetic wave.Micro-wave oven by
Power supply, magnetron, the part such as control circuit and cooking cavity form.Microwave oven internal mainly utilizes axial fan assembly to transformation
The components such as device or frequency converter and magnetron radiate.Axial fan assembly includes mainly flabellum, collecting cover, blower tray and electricity
Machine.It is positive correlation in aerofoil fan operational process, between flow and noise.When rotation speed of the fan increases, flow increases, and makes an uproar
Sound level can also be promoted accordingly, and the high rotating speed of motor exacerbates the loss of motor, increases cost, also results in simultaneously
Reliability, safety issue.With the significantly promotion of people's living standard, the noise problem of fan is increasingly closed
Note, high air quantity, low noise are the development trends of fan product.
Currently, common aerofoil fan is turned using circumferential equally distributed blades arrangement mode with the periodicity of fan
It is dynamic, it will produce the discrete noise with fundamental frequency peak value.Its frequency depends on the rotation of the number of blade, the arrangement mode of blade and fan
Rotary speed, and fundamental frequency peak value then plays conclusive effect to discrete noise overall sound pressure level size.
In general, the blade passing frequency for the fan that blade is evenly arranged is：
F=nzi/60
N in formula:Fan rotating speed per minute, rpm；
z:The number of blade of fan；
i:1,2,3 ... ..., harmonic wave serial number.
When blade is evenly arranged, fan forms self-noise since itself is rotated；In addition, fan and surrounding afflux cover wall
The acoustic pressure pulsation that the tail air-flow periodic shock downstream object of the interaction of generating period and blade is formed between face
It adds up on blade passing frequency and its harmonic frequency so that discrete noise has higher sound pressure level.
Utility model content
The purpose of this utility model is to provide a kind of fan, which has the advantages that air quantity is big, noise is small.
To achieve the goals above, the utility model provides a kind of fan, including wheel hub and the identical multiple blades of shape,
Circumferential direction of multiple blades along the outer ring of the wheel hub is equidistantly spaced from and is formed along the axial direction of the wheel hub and misplaced.
Preferably, the whole circle of the circumferential direction of the fan includes the multigroup blade group being alternately arranged, and the blade group includes circumferential
It is equidistantly spaced from and several identical described blades of axial position, it is mutually wrong along the axial direction between the blade group
Position.
Preferably, the axial chord length on the leaf top of each blade is d, the maximum axial dislocation between the blade group
Spacing C is not more than 30%*d.
Preferably, C=(15%~25%) * d.
Preferably, the fan includes the first blade group and the second blade group, the second blade in second blade group
Axile displacement spacing between the first blade in first blade group is (15%~25%) * d.
Preferably, the fan includes the first blade group, the second blade group and third blade group, in second blade group
The second blade and first blade group in the first blade between axile displacement spacing be c1, in the third blade group
Third blade and first blade group in the first blade between axile displacement spacing be c2, meet c1<c2≤C.
Preferably, c1=(10%~15%) * d, c2=(15%~25%) * d.
Preferably, the fan includes blade group described in 2~4 groups, and/or, the fan includes 4~12 leaves
Piece.
Preferably, the blade is that center of gravity accumulates repeatedly line along the circumferentially prone antecurvature leaf in direction of rotation of the fan
Piece；
Alternatively, the blade is in face of direction of flow along the sweepforward blade of the axial bending of the wheel hub,
Repeatedly line includes straightway radially outward and the radial outer end from the straightway to the center of gravity product of the blade
The arc section extended along the axial bending.
Preferably, the fan is aerofoil fan.
In addition, the utility model additionally provides a kind of micro-wave oven, which includes fan described above.
In the fan of the utility model, by reasonably controlling dislocation distance of the blade along the axial direction of wheel hub, with
Pass through frequency by what the axile displacement of blade re-modulated blade.Fortune can destroy consolidating for blade and upstream and downstream in this way
Determine generated air-flow covibration when barrier (such as holder, transformer or frequency converter, magnetron etc.) interferes with each other, meanwhile,
The fundamental frequency of original fan can also be distributed in different frequencies, disperse the distribution of energy, to the discrete noise of the fan
Preferable control action is played, in addition, on this basis, the aeroperformance of the fan is also carried to a certain extent
It rises.
Other features and advantages of the utility model will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is to be used to provide a further understanding of the present invention, an and part for constitution instruction, and following
Specific implementation mode be used to explain the utility model together, but do not constitute limitations of the present invention.In the accompanying drawings：
Fig. 1 is the stereogram according to the fan of specific embodiment of the present utility model；
Fig. 2 is according to a kind of front view of the fan of specific implementation mode of the utility model, which includes 2 groups of blades
Group；
Fig. 3 is according to the front view of the fan of another specific implementation mode of the utility model, which includes 3 groups of leaves
Piece group；
Fig. 4 is, according to the vertical view of the fan of specific embodiment of the present utility model, the center of gravity product for illustrating blade changes
Line, the blade are forward curved vane；
Fig. 5 is, according to the stereogram of the fan of specific embodiment of the present utility model, the center of gravity product for illustrating blade changes
Line, the blade are sweepforward blade；
Fig. 6 is the internal structure schematic diagram according to the micro-wave oven of specific embodiment of the present utility model；
Fig. 7 is the explosive view of fan component.
Reference sign
1 cavity, 2 fan component
3 bottom plate, 4 transformer
5 power cord bifurcated, 6 back plate
7 magnetrons
20 fan, 21 wheel hub
22 blade, 24 collecting cover
25 holder, 26 motor
211 outer ring, 221 center of gravity accumulates the line that changes
Specific implementation mode
Specific embodiment of the present utility model is described in detail below in conjunction with attached drawing.It should be understood that herein
Described specific implementation mode is only used for describing and explaining the present invention, and is not intended to limit the utility model.
In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower, top, bottom " is usually
Be for direction shown in the drawings either for it is vertical, vertically or on gravity direction for each component mutual alignment
Relationship description word.
The utility model provides a kind of novel fan, as shown in Figure 1, the fan 20 includes that wheel hub 21 is identical with shape
Multiple blades 22, circumferential direction of the multiple blades 22 along the outer ring of wheel hub 21 211 be equidistantly spaced from and along the axial direction of wheel hub 21
Form dislocation.Therefore, in the fan of the utility model 20, by reasonably controlling axial direction of the blade 22 along wheel hub 21
The fundamental frequency (i=1) of original fan can be distributed in different frequencies, disperse the distribution of energy, to the wind by dislocation distance
The discrete noise of fan 20 plays preferable control action, while can also be to a certain extent so that the aeroperformance of fan 20
It gets a promotion.
In the fan 20 of the utility model, multiple blades 22 of fan 20 are grouped first, i.e. the week of fan 20
Include multigroup blade group for being alternately arranged to whole circle, blade group include it is circumferential be equidistantly spaced from and axial position it is identical several
Blade 22, in axial direction mutual dislocation between blade group.Wherein, the quantity of each blade group can be for 1,2 or more
It is a.Form by carrying out blade group to the fan 20 carries out axile displacement, by the fundamental frequency (i=1) of existing original fan
It is distributed in the frequency of correspondence different leaves group of the fan 20 of the utility model, carrys out the distribution of energy dispersive, while will be multigroup
The whole circle arrangement of circumferential direction of the blade group alternately along outer ring 211, can also meet the dynamic balancing effect of the fan 20.
Wherein, as shown in Figures 2 and 3, the axial chord length on the leaf top of each blade 22 is d, the maximum between blade group
Axile displacement spacing C is not more than 30%*d.Axile displacement spacing C i.e. between blade group should not be too large.
Further, it is preferable to be C=(15%~25%) * d.At this point, the noise reduction of fan 20 is best, heat dissipation performance
It is more outstanding.
In the fan 20 such as a kind of specific implementation mode of Fig. 2 of the utility model, i.e., the fan 20 is divided for 2 leaves
Piece group.Wherein, fan 20 includes the first blade group and the second blade group, the second blade in the second blade group and the first blade group
In the first blade between axile displacement spacing be preferably (15%~25%) * d.
In the fan 20 such as another specific implementation mode of Fig. 3 of the utility model, which divides for 3 blades
Group.Fan 20 includes the first blade group, the second blade group and third blade group, the second blade and the first leaf in the second blade group
The axile displacement spacing between the first blade in piece group is c1, in the third blade and the first blade group in third blade group
Axile displacement spacing between first blade is c2, meets c1<c2≤C.
Preferably, c1=(10%~15%) * d, c2=(15%~25%) * d.
In the fan 20 of the utility model, it is preferable that the fan 20 includes 2~4 groups of blade groups, and/or, fan includes
4~12 blades 22.
Experiment one, respectively to the fan 20 for using above-mentioned the utility model for being divided into 2 groups of blade groups and existing original wind
Fan carries out noise effects test and carries out temperature liter experiment, and the axile displacement spacing C (phases of the fan 20 for the utility model
For the ratio of d) it is modulated appropriately, wherein d is the axial chord length on the leaf top of blade, measures its noise effects such as 1 institute of table
Show, measuring its heat dissipation effect to each component in micro-wave oven (referring to Fig. 6), the results are shown in Table 2, wherein fan blade 22
Total quantity be 6 leaves.
The noise data of the fan of 1 two groups of blade group axile displacements of table
Test result of the 2 two groups of blade group axile displacements of table to micro-wave oven main heat sink component Wen Sheng
Experiment two, respectively to the fan 20 for using above-mentioned the utility model for being divided into 3 groups of blade groups and existing original wind
Fan carries out noise effects test and carries out temperature liter experiment, and the axile displacement spacing C (packets of the fan 20 for the utility model
C1, c2 are included, the ratio relative to d) it is modulated appropriately, wherein d is the axial chord length on the leaf top of blade, measures its noise effect
Fruit is as shown in table 3, and measuring its heat dissipation effect to each component in micro-wave oven (referring to Fig. 6), the results are shown in Table 4, apoplexy
Fan leaf 22 is all made of for 6 blade fans.
The noise data of the fan of 3 three groups of blade group axile displacements of table
Test result of the 4 three groups of blade group axile displacements of table to micro-wave oven main heat sink component Wen Sheng
By above-mentioned two groups of experiments, analysis obtains：C=(15%~25%) * d or c1=(10%~15%) * d, c2=
(15%~25%) * d, at this point, the noise reduction of fan 20 is best, heat dissipation performance is also more outstanding.As it can be seen that new with this practicality
The method that blade 22 is grouped to simultaneously one determining deviation of axile displacement of type can destroy blade 22 with upstream and downstream (for wind
For flow direction) fixed obstacle (such as holder 25, transformer 4 or frequency converter, magnetron 7 etc.) generated gas when interfering with each other
Flow covibration so that the noise reduction of fan 20 and heat dissipation are more preferable.In addition, each blade group axile displacement is arranged so that blade 22
It is modulated again by frequency so that blade 22 is dispersed to one by the energy of the notable noise peak corresponding to frequency
On the sideband of Series Blade group, to obtain noise energy redistribution and total acoustic power grade reduce effect.
In general, in cooling fan, the curve that the center of gravity of the blade profile of different leaf relative superiority or inferiority connects is known as blade
Center of gravity product change line.Particularly, in the fan of the utility model 20, as shown in figure 4, blade 22 is center of gravity product repeatedly 221 edge of line
The circumferentially prone forward curved vane in direction of rotation of fan 20.Alternatively, in fan 20 as shown in Figure 5, blade 22 is to meet
Sweepforward blade of the direction of flow along the axial bending of wheel hub 21.Wherein, the center of gravity product of blade 22 changes line 221 including radially
The straightway of extension and the arc section for being bent extension in an axial direction from the radial outer end of straightway.
When using fan 20 as shown in Figure 4 antecurvature formula blade 22 when, due to change different leaf eminence incomings with
The 22 up-front attack time of blade, therefore air-flow covibration can be improved.On the other hand, forward curved vane can also effectively inhibit
Tail covibration, achievees the purpose that noise reduction.In addition, forward curved vane helps to improve the Radial Flow at leaf top, reduce blade
The aerodynamic loss of 22 top angular region, to improve the working efficiency of fan 20.
Alternatively, when using fan 20 as shown in Figure 5, improve 22 surface of blade by using the blade 22 of forward swept
Pressure distribution, so as to effectively inhibit top tip vortex and the up-front horse shoe vortex of blade root, reduce channel in vortex range,
Improve the mechanical efficiency of the fan 20.On the other hand, the Radial pressure distribution of sweepforward blade leads to the side in the high region of most of leaf
Thickness of boundary layer reduces, and has efficiently controlled the radial miscibility of flowing, has advantageously reduced the noise of fan 20.
By the design of above antecurvature formula or forward swept blade, and can further regulation blade antecurvature angle or preceding
Sweep angle degree is adjusted, and can further improve the noise and heat dissipation effect of fan 20.
At the same time, the fan 20 of the utility model is a kind of common aerofoil fan 20.
In addition, the utility model additionally provides a kind of micro-wave oven, as shown in fig. 6, micro-wave oven is equipped with fan described above
20.Therefore the micro-wave oven also contains all advantages of the fan 20 of the utility model, no longer repeats one by one.
The micro-wave oven includes bottom plate 3, back plate 6, magnetron 7, transformer 4 or frequency converter, microwave oven heating cavity body 1, power supply
Line bifurcated 5, high-voltage diode and fan component 2.As shown in fig. 7, fan component 2 includes fan 20, collecting cover 24,25 and of holder
Motor 26.Usual transformer 4 or frequency converter for giving magnetron 7 to power, magnetron 7 generate microwave to the food in cavity 1 into
Row heating, fan component 2 radiate to magnetron 7 and transformer 4 or frequency converter.Wherein, cavity 1 and transformer 4 or frequency conversion
Device is fixed on bottom plate 3, and magnetron 7 is fixed on cavity 1, and holder 25 is fixed by screws in back plate 6, and motor 26 is fixed on
On the holder 25, the shaft of motor 26 passes through the shaft mounting portion of fan 20.
Preferred embodiments of the present invention, still, the utility model and unlimited are described in detail above in association with attached drawing
Detail in the above embodiment can be to the skill of the utility model in the range of the technology design of the utility model
Art scheme carries out a variety of simple variants, these simple variants belong to the scope of protection of the utility model.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the utility model is to each
The possible combination of kind no longer separately illustrates.
In addition, arbitrary combination can also be carried out between a variety of different embodiments of the utility model, as long as it is not disobeyed
The thought for carrying on the back the utility model, equally should be considered as content disclosed in the utility model.
Claims (11)
1. a kind of fan, including wheel hub (21) and the identical multiple blades (22) of shape, which is characterized in that multiple blades
(22) circumferential direction along the outer ring (211) of the wheel hub (21) is equidistantly spaced from and forms mistake along the axial direction of the wheel hub (21)
Position.
2. fan according to claim 1, which is characterized in that the whole circle of circumferential direction of the fan (20) includes being alternately arranged
Multigroup blade group, the blade group is equidistantly spaced from including circumferential direction and several identical described blades (22) of axial position, institute
It states between blade group along the axial direction mutual dislocation.
3. fan according to claim 2, which is characterized in that the axial chord length on the leaf top of each blade (22) is
D, the maximum axial dislocation spacing C between the blade group are not more than 30%*d.
4. fan according to claim 3, which is characterized in that C=(15%~25%) * d.
5. fan according to claim 3, which is characterized in that the fan (20) includes the first blade group and the second blade
Group, the axile displacement spacing between the first blade in the second blade and first blade group in second blade group are
(15%~25%) * d.
6. fan according to claim 3, which is characterized in that the fan (20) includes the first blade group, the second blade
Group and third blade group, the axis between the first blade in the second blade and first blade group in second blade group
It is c1 to dislocation spacing, the axis between the first blade in third blade and first blade group in the third blade group
It is c2 to dislocation spacing, meets c1<c2≤C.
7. fan according to claim 6, which is characterized in that c1=(10%~15%) * d, c2=(15%~25%) *
d。
8. fan according to claim 2, which is characterized in that the fan (20) includes blade group described in 2~4 groups, and/
Or, the fan (20) includes 4~12 blades (22).
9. the fan according to any one of claim 1~8, which is characterized in that the blade (22) is that center of gravity product changes
Line (221) along the fan (20) the circumferentially prone forward curved vane in direction of rotation；
Alternatively, the blade (22) is the sweepforward blade of the axial bending in face of direction of flow along the wheel hub (21),
Repeatedly line (221) includes straightway radially outward and the radial direction from the straightway to the center of gravity product of the blade (22)
The arc section that outer end extends along the axial bending.
10. fan according to claim 1, which is characterized in that the fan (20) is aerofoil fan.
11. a kind of micro-wave oven, which is characterized in that the micro-wave oven includes the wind according to any one of claim 1~10
It fans (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721929381.7U CN207961054U (en) | 2017-12-30 | 2017-12-30 | Fan and micro-wave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721929381.7U CN207961054U (en) | 2017-12-30 | 2017-12-30 | Fan and micro-wave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207961054U true CN207961054U (en) | 2018-10-12 |
Family
ID=63731745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721929381.7U Active CN207961054U (en) | 2017-12-30 | 2017-12-30 | Fan and micro-wave oven |
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| Country | Link |
|---|---|
| CN (1) | CN207961054U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061059A (en) * | 2017-12-30 | 2018-05-22 | 广东美的厨房电器制造有限公司 | Fan and micro-wave oven |
-
2017
- 2017-12-30 CN CN201721929381.7U patent/CN207961054U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061059A (en) * | 2017-12-30 | 2018-05-22 | 广东美的厨房电器制造有限公司 | Fan and micro-wave oven |
| CN108061059B (en) * | 2017-12-30 | 2024-04-30 | 广东美的厨房电器制造有限公司 | Fan and microwave oven |
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