CN203604275U - Silent type draught fan - Google Patents
Silent type draught fan Download PDFInfo
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- CN203604275U CN203604275U CN201320716887.5U CN201320716887U CN203604275U CN 203604275 U CN203604275 U CN 203604275U CN 201320716887 U CN201320716887 U CN 201320716887U CN 203604275 U CN203604275 U CN 203604275U
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- air channel
- peripheral air
- tubular
- motor
- acoustic board
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Abstract
The utility model discloses a silent type draught fan which comprises a motor and a fan impeller connected with the motor. A barrel-shaped peripheral air channel is arranged around the motor, a cover plate is arranged at the upper end of the barrel-shaped peripheral air channel, the barrel-shaped peripheral air channel and the cover plate are closely connected to form a relatively-sealed cavity, an air inlet is formed in the cover plate, an air guide ring is arranged between the air inlet and the fan impeller, a sound absorption plate is arranged at the lower end of the barrel-shaped peripheral air channel, a gap between the sound absorption plate and the lower end of the barrel-shaped peripheral air channel is used as an air outlet, and the motor is arranged on the sound absorption plate. According to the draught fan, through the reasonable structure improvement, the flow characteristics of air in the draught fan are especially combined, through the cooperation of the barrel-shaped peripheral air channel capable of adsorbing sounds and the sound absorption plate at the air outlet, air flow is guided, meanwhile, the silent effect is achieved, the impeller of the draught fan does not need to be modified, the requirements for fan blades and the impeller are lowered, and in addition, the draught fan is more convenient to mount and maintain due to the fact that the motor can be directly arranged on the sound absorption plate.
Description
Technical field
The utility model relates to a kind of blower fan, particularly a kind of silencing type blower fan.
Background technique
Blower fan is the indispensable critical component of industry equipment and household electric appliance, and in the time of work, air-flow enters blade space by air inlet, then, under the driving of blade, forms wind and out does work.At present the main noise of blower fan is that source has: 1. the mechanical noise of ventilator, comprise that (1) damage in impeller is inhomogeneous or because blast causes the distortion of part, and make whole rotor unbalance and the noise that produces; (2) bearing after operation due to wearing and tearing, the noise mutually producing with axle; (3) due to being installed, bad or each part connects the loosening noise producing; (4) impeller High Rotation Speed produces vibration, causes a certain partial resonance of body and the noise that produces; 2. noise of motor, wherein in whole ventilation system, motor is important component part, but the motor adopting due to actual blower fan manufacturer is mainly provided by motor manufacturer, blower fan manufacturer does not generally do too many noise-reducing processing, comprise that the axial motion sound of rotor unbalance or the generation of electromagnetic force axial component, aerodynamic noise that motor cooling fan produces etc. all can make motor and even blower fan produce very large noise, unless and the noise of motor uses the quiet motor of high price, otherwise be substantially difficult to avoid.In addition, snail tongue noise, the discharge air-flow of impeller and snail tongue interact and produce the noise due to trembleing, and are also common noise sources in a blower fan.
The main method that reduces at present fan noise is reasonably to adjust the structure of snail tongue and impeller mostly.But order first two method all has some limitations, the low noise performance that can increase energy consumption simultaneously or reduce blower fan is being fallen.
Summary of the invention
In order to overcome the deficiencies in the prior art, the utility model provides a kind of operation more quiet blower fan.
The utility model solves the technological scheme that its technical problem adopts:
A kind of silencing type blower fan, comprise motor and the fan blade being connected with motor, the surrounding of described motor is provided with the peripheral air channel of tubular, the upper end in the peripheral air channel of wherein said tubular is provided with cover plate, between the peripheral air channel of described tubular and cover plate, be closely connected to form the cavity of relative sealing, in described cover plate, have intake grill, between this intake grill and fan blade, be provided with air-ducting ring, the inner side in the peripheral air channel of described tubular is provided with acoustical cotton, the lower end in the peripheral air channel of described tubular is provided with acoustic board, the space of lower end, the peripheral air channel of described acoustic board and tubular is as exhaust outlet, described motor is arranged on acoustic board.
In order further to improve muting function, make air-flow more smooth and easy, the peripheral air channel of described tubular is up-small and down-big cone-shaped.
In order to reduce the jitter phenomenon between the peripheral air channel of acoustic board and tubular, described acoustic board is connected by support with the peripheral air channel of tubular.
Enough in order to guarantee air quantity, the inside radius in described peripheral air channel is defined as R, and the radius of described acoustic board is defined as R ', and the nominal air delivery of described fan blade is defined as Q, and the wind speed of described exhaust outlet is defined as V, has (R
2-R '
2) * 3.14*V=Q/ 3600.
In order to guarantee the sound-absorbing effect of acoustic board, the radius of described fan blade is defined as r, and the radius of described acoustic board is defined as R ', wherein R '=r.
The beneficial effects of the utility model are: this blower fan is by rational structure improvement, particularly in conjunction with the flow characteristic of gas in blower fan, match with the acoustic board at exhaust outlet place by the peripheral air channel of tubular that can sound-absorbing, in guiding gas flow, play muting function, do not need to change the impeller of blower fan, reduce the requirement to fan blade, wind wheel, motor can be directly installed on acoustic board in addition, makes the installation and maintenance of blower fan convenient.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is plan view of the present utility model;
Fig. 2 is stereogram of the present utility model;
Fig. 3 is use schematic diagram of the present utility model.
Embodiment
With reference to Fig. 1, Fig. 2, a kind of silencing type blower fan, comprises motor 1 and the fan blade 2 being connected with motor 1, and wherein the type of fan blade 2 does not have special restriction, and motor 1 also can adopt suitable model as required.The surrounding of described motor 1 is provided with the peripheral air channel 3 of tubular, the upper end in the peripheral air channel 3 of wherein said tubular is provided with cover plate 4, in described cover plate 4, have intake grill 41, between this intake grill 41 and fan blade 2, be provided with air-ducting ring 5, air-ducting ring 5 is for guiding the gas sucking in to fan blade 2 centers.Between the peripheral air channel 3 of described tubular and cover plate 4, be closely connected to form the cavity of relative sealing, only have intake grill 41 supplied gas circulations.Between the peripheral air channel 3 of tubular and the peripheral air channel 3 of tubular, leave enough space supplied gas circulations simultaneously.The inner side in the peripheral air channel 3 of described tubular is provided with acoustical cotton, the lower end in the peripheral air channel 3 of described tubular is provided with acoustic board 6, on acoustic board 6, also there is soundproof material, itself both can sound insulation also gas can be directed to the outer of acoustic board 6, i.e. the fan blade place of corresponding fan blade 2.Described acoustic board 6 is connected by the peripheral air channel 3 of support 61 and tubular, the space of described acoustic board 6, support 61 and 3 lower ends, the peripheral air channel of tubular is as exhaust outlet 62, described motor 1 is arranged on acoustic board 6, wherein also can be one-body molded between the peripheral air channel 3 of tubular, acoustic board 6 and support 61, can further reduce the shake producing because of alignment error between peripheral air channel 3, acoustic board 6 and support 61, the shape of support 61 does not need to design very complicatedly under the prerequisite that does not affect air-out.
In order to improve muting function, the peripheral air channel 3 of described tubular be up-small and down-big cone-shaped, less near the circumference at intake grill 41 places, and the circumference at close exhaust outlet 62 places is larger.Through evidence, adopt the peripheral air channel 3 of this pyramidal tubular, muting function is better.Should be noted that the shape that the peripheral air channel 3 of tubular adopts itself does not directly affect the size and dimension of acoustic board 6, motor 1 and fan blade 2.
The inside radius in described peripheral air channel 3 is defined as R, and the radius of described acoustic board 6 is defined as R ', and the nominal air delivery of described fan blade 2 is defined as Q, and the design wind speed of described exhaust outlet 62 is defined as V, has (R
2-R '
2) * 3.14*V=Q/ 3600, to guarantee maximum air output, utilize to greatest extent the output power of motor 1.Generally, the nominal air delivery Q of fan blade 2 and the radius R ' of acoustic board 6 are all determined by the fan blade motor of selecting, are known quantity.The design wind speed V of exhaust outlet 62 is determined by blower fan Environmental Conditions and designing requirement.V is less, and R is larger, and noise is less.General domestic environment, V is less than 3m/s can reach the requirement of household electric appliance to noise; And evening silent mode, it is better that V is less than 1m/s.
The radius of described fan blade 2 is defined as r, and the radius of described acoustic board 6 is defined as R ', wherein R '=r, and the radius of acoustic board 6 is identical with the radius of fan blade 2, and both effectively sound insulations can not affect again export volume.Although increase the peripheral air channel of tubular 3 radiuses, and guarantee, in situation that exhaust outlet 62 areas are constant, also can reduce noise, can make blower fan volume become large, affect its Applicable scope.
According to above-mentioned principle, the utility model can also carry out suitable change and modification to above-mentioned mode of execution, and the peripheral air channel 3 of for example tubular can adopt cylindric or polygon tubular, and intake grill 41 and exhaust outlet 62 places can install grid etc. additional.Therefore, the utility model is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present utility model modifications and changes more of the present utility model.
The effect of this blower fan can be by following experimental verification:
Blower fan is tested in sound proof chamber, and wherein said motor 1 adopts the BI EC brshless DC motor of power 7W, and impeller of blower peripheral diameter 300mm attracts board diameter 220mm.
1. when blower fan does not arrange acoustic board 6 and soundproof measures is not made in the peripheral air channel 3 of tubular yet, when other condition is constant, air quantity is 157m
3/ h, the noise of blower fan reaches 45 decibels, and the electromagnetic noise of its medium-high frequency and the airflow noise of low frequency mix, and especially the electromagnetic noise of high frequency is ear-piercing especially;
2. when blower fan only arranges the peripheral air channel 3 of tubular with acoustical cotton and acoustic board 6 sound insulations are not set, when other condition is constant, air quantity is 152m
3/ h, the noise of blower fan is 38 decibels, and the electromagnetic noise of high frequency and the airflow noise of low frequency mix, and the electromagnetic noise of high frequency is wherein more ear-piercing;
3. when blower fan only has acoustic board sound insulation, soundproof measures is not made in the peripheral air channel 3 of tubular, and when other condition is constant, air quantity is 157m
3/ h, fan noise is 40 decibels, and the electromagnetic noise of high frequency and the airflow noise of low frequency mix, and the electromagnetic noise of its medium-high frequency is ear-piercing especially;
4. this blower fan, in the situation that other condition is constant, has adopted behind the air channel of the peripheral air channel 3 of tubular and the relative sealing of acoustic board 6 mix proportions, and air quantity is 155m
3/ h, noise obviously drops to 32 decibels, and almost can't hear ear-piercing high-frequency electromagnetic noise, only hears soft faint airflow noise.In addition install additional after acoustic board 6, can prevent that air-flow from forming eddy current at exhaust outlet 62 places, make air-flow more smooth and easy, make air quantity on the contrary than there is no the larger of acoustic board 6, and airflow smooth itself also can reduce noise.
Above-mentioned laboratory data has illustrated that design that the peripheral air channel 3 of tubular and acoustic board 6 match has taken into full account feature distinguished and admirable in blower fan, has good especially, significant muting function.
With reference to Fig. 3, the utility model is particularly useful in the middle of household electrical appliances, for example dehumidifier, air cleaner etc.Through facts have proved, this blower fan is in conjunction with the flow characteristic of gas in blower fan, matches with the acoustic board 6 at exhaust outlet 62 places by the peripheral air channel 3 of tubular that can sound-absorbing, can bring following beneficial effect:
1, minimum because of distance between traditional centrifugal blower snail tongue and wind wheel, can produce larger noise herein, and this blower fan does not need snail tongue structure, does not have this situation.
2, the noise that traditional centrifugal blower motor produces, can directly spread out of from exhaust outlet, and the noise that this fan motor produces does not directly spread out of from exhaust outlet, must be through the air channel inwall reflection in the peripheral air channel 3 of tubular.And wind path wall posts acoustical cotton, can reach more than 90% the absorptivity of high frequency noise, effectively reduce high frequency noise.
3, traditional centrifugal blower is air inlet through hollow shaft, radially air-out.And this blower fan is realized air inlet through hollow shaft, axially air-out, concrete wind wheel radial air flow, after tubular peripheral air channel 3 guiding, changes into radially again.
4, this blower fan is by changing the diameter in peripheral air channel, the wind speed can conveniently control the peripheral air channel 3 of air-flow arrival tubular time, the peripheral air channel of tubular 3 diameters are larger, and wind speed is less, guide air-flow to turn to produced noise less, also can conveniently control the size of exhaust outlet 62 simultaneously.The peripheral air channel of tubular 3 diameters are larger, and acoustic board 6 is less, and exhaust outlet 62 is larger, and wind speed is less, and the wind that air-flow produces is made an uproar less.
In guiding gas flow, play muting function, do not need to change the impeller of blower fan, reduce the requirement to fan blade 2, motor 1 can be directly installed on acoustic board in addition, makes the installation and maintenance of blower fan convenient.
Claims (5)
1. a silencing type blower fan, comprise motor (1) and the fan blade (2) being connected with motor (1), it is characterized in that: the surrounding of described motor (1) is provided with the peripheral air channel of tubular (3), the upper end in the peripheral air channel of wherein said tubular (3) is provided with cover plate (4), between the peripheral air channel of described tubular (3) and cover plate (4), be closely connected to form the cavity of relative sealing, in described cover plate (4), have intake grill (41), between this intake grill (41) and fan blade (2), be provided with air-ducting ring (5), the inner side in the peripheral air channel of described tubular (3) is provided with acoustical cotton, the lower end in the peripheral air channel of described tubular (3) is provided with acoustic board (6), the space of lower end, the peripheral air channel (3) of described acoustic board (6) and tubular is as exhaust outlet (62), described motor (1) is arranged on acoustic board (6).
2. a kind of silencing type blower fan according to claim 1, is characterized in that: the peripheral air channel of described tubular (3) is for up-small and down-big cone-shaped.
3. a kind of silencing type blower fan according to claim 1, is characterized in that: described acoustic board (6) is connected by support (61) with the peripheral air channel of tubular (3).
4. a kind of silencing type blower fan according to claim 1, it is characterized in that: the inside radius in described peripheral air channel (3) is defined as R, the radius of described acoustic board (6) is defined as R ', the nominal air delivery of described fan blade (2) is defined as Q, the wind speed of described exhaust outlet (62) is defined as V, has (R
2-R '
2) * 3.14*V=Q/ 3600.
5. a kind of silencing type blower fan according to claim 1, is characterized in that: the radius of described fan blade (2) is defined as r, the radius of described acoustic board (6) is defined as R ', wherein R '=r.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320716887.5U CN203604275U (en) | 2013-11-14 | 2013-11-14 | Silent type draught fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320716887.5U CN203604275U (en) | 2013-11-14 | 2013-11-14 | Silent type draught fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203604275U true CN203604275U (en) | 2014-05-21 |
Family
ID=50716952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320716887.5U Withdrawn - After Issue CN203604275U (en) | 2013-11-14 | 2013-11-14 | Silent type draught fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203604275U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629128A (en) * | 2013-11-14 | 2014-03-12 | 梁国巨 | Silent fan |
-
2013
- 2013-11-14 CN CN201320716887.5U patent/CN203604275U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629128A (en) * | 2013-11-14 | 2014-03-12 | 梁国巨 | Silent fan |
| CN103629128B (en) * | 2013-11-14 | 2015-10-07 | 梁国巨 | A kind of Silent fan |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140521 Effective date of abandoning: 20151007 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |