CN103256250A - Centrifugal fan and blade thereof - Google Patents
Centrifugal fan and blade thereof Download PDFInfo
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- CN103256250A CN103256250A CN2013102205641A CN201310220564A CN103256250A CN 103256250 A CN103256250 A CN 103256250A CN 2013102205641 A CN2013102205641 A CN 2013102205641A CN 201310220564 A CN201310220564 A CN 201310220564A CN 103256250 A CN103256250 A CN 103256250A
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- impeller
- centrifugal blower
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Abstract
The invention provides a centrifugal fan and a blade thereof. The centrifugal fan is lower in noise during operation, and can reduce the fluctuation amplitude of the output air volume. The centrifugal fan comprises an air box provided with an outlet, wherein an impeller is mounted in the air box in a sleeving manner; a plurality of blades are arranged on the impeller; an oblique part arranged at a preset angle to a port line of a screw-out end of the outlet is arranged on a cross section of each blade; and the preset angles are set according to the air volume in the air box. Each oblique part is arranged on the cross section of each blade of the centrifugal fan, and forms the preset angle with the port line of the screw-out end of the outlet; when the impeller is screwed out of the outlet of the air box, the blades are separated from the outlet of the air box gradually; therefore, airflow rotating with the blades is decreased gradually; the impact of the airflow on the air box is smaller; the noise generated by the impact of the airflow on the air box is reduced; and the low-noise operation of the centrifugal fan is realized.
Description
Technical field
The present invention relates to the centrifugal blower technical field, particularly relate to a kind of blade of centrifugal blower.The invention still further relates to a kind of centrifugal blower that adopts above-mentioned blade.
Background technique
Blower fan is when work, air-flow axially enters bellows by blower fan, under the driving of impeller, rotate with impeller then, when the rotating speed of impeller acquires a certain degree, the suffered centripetal force of air-flow is not enough to keep it along the axial rotation of impeller, air-flow will produce the trend of moving away from the impeller rotating center along the radial direction of impeller, and the suffered power of air-flow this moment is centrifugal force, and the blower fan that this dependence centrifugal force does work is called centrifugal fan or centrifugal blower.
Centrifugal blower is converted to the principle of potential energy according to kinetic energy, utilizes the impeller of rotation at a high speed that air-flow is accelerated, and slows down, changes the flow direction of air-flow then, makes kinetic energy be converted into potential energy.
In the process that above-mentioned energy transforms, when impeller drove air-flow that gas rotates generation at a high speed and goes out the outlet of blower fan, gas turned in the outlet port along with blade and produces pulsing airflow; In the existing centrifugal blower, the blade of impeller adopts the cross section of yi word pattern to arrange, and then when the outlet of blower fan was left in certain blade rotation, the pulsing airflow that the gas that drives because of this blade forms was also just ended by moment thereupon.
But along with blade rotates into bellows again, this strand pulsing airflow can produce bigger impact force to bellows to most of pulsing airflow when the constraint that is subjected to bellows under the effect of inertial force, and then produces big noise; Because the effect of inertial force, pulsing airflow also can produce noise in whole airflow line.
Therefore, how to design a kind of centrifugal blower and blade thereof, the pulsing airflow to reduce to produce when impeller leaves the outlet of bellows reduces noise, is the present technical issues that need to address of those skilled in the art.
Summary of the invention
The blade that the purpose of this invention is to provide a kind of centrifugal blower, the pulsed quantity that air-flow produces in the time of can reducing impeller and leave the outlet of bellows, and then reduce noise.
Another object of the present invention provides a kind of centrifugal blower with above-mentioned blade, and the noise in its running is less, can reduce the fluctuating range of discharge quantity of fan.
For solving the problems of the technologies described above, the invention provides a kind of blade of centrifugal blower, described centrifugal blower comprises the bellows with outlet, be set with impeller in the described bellows, described impeller is provided with several described blades, the port lines that the cross section of described blade has with the back-out end of described outlet is the rake that predetermined angle arranges, and described predetermined angle arranges according to the air quantity in the described bellows.
The cross section of blade of the present invention is provided with rake, the port lines of the back-out end of described rake and bellows outlet is predetermined angle, when impeller screws out the outlet of bellows, blade can break away from the outlet of bellows gradually, then the air-flow with this blade rotation can reduce gradually, air-flow is less to the impact that bellows produce, thereby reduces the noise that produces because of the gas shock bellows, realizes the low noise running of centrifugal blower.
Preferably, the cross section of described blade is the V-shape setting.
When impeller screwed out the outlet of bellows, the blade two ends of V-shape broke away from outlet gradually and enter bellows inside, and then the air-flow at blade two ends shrinks gradually, and throughput and current rate reduce gradually, finally subdue in the bottom of V-shape; That is to say that the cross section of this V-shape is arranged so that the air-flow on the blade is comparatively even in the axial distribution of bellows outlets, can pop-off at the back-out end of outlet, air-flow is less relatively to the impact of bellows, can effectively reduce the bellows noise.
Preferably, the curved setting of the cross section of described blade.
The cross section of arc is arranged so that the transition of blade is comparatively mild, and when impeller screwed out the outlet of bellows, the radian at blade two ends was bigger, for subduing of air-flow provides certain space, then the air-flow that carries on the blade reduces gradually, and is also less to the impact that bellows cause, and then reduces noise.
Preferably, the cross section of described blade is the inclined-plane, and the predetermined angle that the port lines of described inclined-plane and described back-out end constitutes is between 30～60 degree.
Adopt the structure setting on inclined-plane, blade only leaves the outlet of bellows obliquely with one end thereof, air-flow can continue to flow in not changing the bevel range of bellows over to, to reduce the pulsed quantity of air-flow velocity, buffer gas flow, and then effectively reducing air-flow to the impact force of bellows, its noise reduction is preferable.
The present invention also provides a kind of centrifugal blower, comprises bellows and the impeller that is built in the described bellows, and described impeller is provided with blade, and described blade is above-mentioned each described blade.
Because centrifugal blower of the present invention has above-mentioned each described blade, so the technique effect that above-mentioned each described blade produces all is applicable to centrifugal blower of the present invention, repeats no more herein.
Preferably, described centrifugal blower also is provided with the fixed base for fixing described bellows, so that the installation of bellows and fixing.
Preferably, the outlet of described bellows is provided with flange, and described back-out end is arranged on an end of described flange.
Description of drawings
Fig. 1 is the Facad structure schematic representation of centrifugal blower provided by the present invention in a kind of embodiment;
Fig. 2 is the plan view of centrifugal blower shown in Figure 1;
Fig. 3 is the longitudinal sectional view of centrifugal blower shown in Figure 1;
Fig. 4 is the discharge quantity of fan vector diagram of centrifugal blower in a kind of embodiment in the prior art;
Fig. 5 is the discharge quantity of fan vector diagram of centrifugal blower of the present invention in a kind of embodiment;
Fig. 6 is stereochemical structure first schematic representation after centrifugal blower shown in Figure 1 is removed shell;
Fig. 7 is stereochemical structure second schematic representation after centrifugal blower shown in Figure 1 is removed shell;
Fig. 8 is the Facad structure schematic representation of a kind of set-up mode of blade provided by the present invention;
Fig. 9 is the side structure schematic representation of blade shown in Figure 8.
Embodiment
Core of the present invention provides a kind of blade of centrifugal blower, the pulsed quantity that air-flow produces in the time of can reducing impeller and leave the outlet of bellows, and then reduce noise.
Another core of the present invention provides a kind of centrifugal blower with above-mentioned blade, and the noise in its running is less, reduces the fluctuating range of discharge quantity of fan.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 1-Fig. 3, Fig. 1 is the Facad structure schematic representation of centrifugal blower provided by the present invention in a kind of embodiment; Fig. 2 is the plan view of centrifugal blower shown in Figure 1; Fig. 3 is the longitudinal sectional view of centrifugal blower shown in Figure 1.
In a kind of embodiment, centrifugal blower of the present invention comprises bellows 4, is set with impeller 2 in the bellows 4, and impeller 2 is provided with several blades 3; Bellows 4 have outlet 7, and impeller 2 leaves from the one end then from exporting the zone that 7 the other end changes outlet 7 correspondences over to, and the end that impeller 2 leaves outlet 7 constitutes the back-out end 71 of outlet 7; As shown in fig. 1, suppose impeller 2 along clockwise rotating, then screw out the top that end 71 is in Fig. 1 middle outlet 7; The cross section of blade 3 has rake 31, and rake 31 is the predetermined angle incline setting with the port lines that screws out end 71; Described predetermined angle can arrange according to the air quantity in the bellows 4.
Described predetermined angle refers to rake 31 and screws out angle between the port lines of end 71, do not consider the influence of the true dip direction of rake 31; Theoretically, described predetermined angle can be the unspecified angle in 0～90 degree scope, obviously, should get rid of zero degree.
Predetermined angle will specifically arrange according to the air quantity size in the bellows 4, when the air quantity in the bellows 4 is big, higher value in 0～90 degree scope of can getting of predetermined angle, increase the magnitude of inclination of rake 31, in order to subdue room and time fully for the air-flow of carrying on the blade 3 provides, and then reduce this part air-flow to the impact of bellows 4, reduce noise; In like manner, the air quantity in bellows 4 hour, predetermined angle can be got the smaller value in the above-mentioned scope, namely rake 31 adopts and slightly is obliquely installed, and to accelerate the flow velocity of air-flow, takes into account operational efficiency and the noise reduction of blower fan.
It will be understood by those skilled in the art that predetermined angle does not adopt 90 degree to arrange usually, the structure of blade 3 is difficult to satisfy the work requirements of centrifugal blower at this moment.
Can expect, rake 31 can also be horizontally disposed with, the benchmark of its inclination is for screwing out the port lines of end 71, and when the port lines that screws out end 71 was obliquely installed or is set to comprise the structure of line of dip, the application's blade 3 also can adopt the structure of yi word pattern iso-cross-section to arrange.
It will also be appreciated that centrifugal blower of the present invention can arrange motor 1, motor 1 can link to each other with the impeller 2 in the bellows 4, in order to provide power for the rotation of impeller 2; Certainly, centrifugal blower can also adopt other energy as the power source of impeller 2.
Centrifugal blower of the present invention can also arrange fixed base 5, then bellows 4 is installed on the fixed base 5, in order to bellows 4 are fixed, as depicted in figs. 1 and 2.
Particularly, outlet 7 places of bellows 4 can arrange flange, screw out the end that end 71 is arranged on flange, and as shown in figures 1 and 3, the rake 31 of blade 3 is the predetermined angle incline setting with the port lines of flange one end.
Please refer to Fig. 4 and Fig. 5, Fig. 4 is the discharge quantity of fan vector diagram of centrifugal blower in a kind of embodiment in the prior art; Fig. 5 is the discharge quantity of fan vector diagram of centrifugal blower of the present invention in a kind of embodiment.
As shown in Figure 4, abscissa represents the time, and y coordinate represents air quantity, and the curve of top represents the air quantity situation over time after the stack of a plurality of blades among Fig. 4, and the curve of below represents air quantity that individual blade exports situation over time; Centrifugal blower of the prior art, the cross section of blade is the yi word pattern setting, and then when blade leaves flange port, this blade drives air-flow moment stops, and the airflow fluctuation amplitude of individual blade correspondence is bigger.
As shown in Figure 5, abscissa represents the time, and y coordinate represents air quantity, and the curve of top represents the air quantity situation over time after the stack of a plurality of blades among Fig. 5, and the curve of below represents air quantity that individual blade exports situation over time; Centrifugal blower of the present invention, blade 3 is provided with rake 31, and individual blade leaves outlet 7 o'clock, the air quantity that this blade carries dwindles gradually, the situation that pop-off can not occur, then when the air quantity of a plurality of blades superposeed, the discharge quantity of fan of whole bellows 4 was comparatively stable.
Please refer to Fig. 6-9, Fig. 6 is stereochemical structure first schematic representation after centrifugal blower shown in Figure 1 is removed shell; Fig. 7 is stereochemical structure second schematic representation after centrifugal blower shown in Figure 1 is removed shell; Fig. 8 is the Facad structure schematic representation of a kind of set-up mode of blade provided by the present invention; Fig. 9 is the side structure schematic representation of blade shown in Figure 8.
In a kind of concrete set-up mode, the cross section of blade 3 can be set to V-shape, and shown in Fig. 6-9, the inclined-plane, both sides of V-shape constitutes rake 31; When blade 3 leaves outlet 7 the time, blade 3 at first enters in the bellows 4 with the end on its inclined-plane, both sides, and then the air-flow that drives of blade 3 is by shrinking gradually in the middle of two side direction, and throughput reduces gradually, and then withers away in the bottom of V-shape.
The cross section of described blade 3 refers to along perpendicular to the direction of blade 3 longitudinal axis it being cut the cross section that obtains; As shown in Figure 6 and Figure 7, a plurality of blades 3 are along the circumferential distribution of impeller 2, and individual blade 3 is at the circumferentially extending of impeller 2, and the direction that blade 3 extends is that it is vertical, and the vertical center line of blade 3 is its longitudinal axis; Cross section with V-shape is example, at the vertical axial direction perpendicular to blade 3 it is cut, and obtains the cross section of V-shape, and as shown in Figure 9, the cross section of other shapes also can be with reference to definition herein.
Hold the 71 relative the other ends can be called screw terminal 72 with outlet 7 back-out, point to the direction that screws out end 71 by screw terminal 72 and be chosen to be the axial of outlet 7, then the cross section of above-mentioned V-shape arranges has increased the axial distribution area of blade 3 in outlet 7, has correspondingly improved blade 3 corresponding air-flows and has exported 7 axial distribution consistency degrees.
Need to prove that when blade 3 was set to the cross section of V-shape, the both sides of V-shape can be symmetrical arranged about its summit, also can adopt asymmetrical structure, namely the both sides chamfer length of V-shape, shape etc. can be inconsistent; When blade 3 adopted asymmetrical cross section to arrange, its cross section was similar to the shape of check mark or near the L type.
In second kind of set-up mode, the cross section of blade 3 can be set to arc, the curved portion of whole blade 3 all is obliquely installed with the port lines that screws out end 71, so curved portion all can be considered as rake 31, but Ci Shi predetermined angle is not certain or certain several specific values, but an angular range.Arc makes that the cross section transition of blade 3 is comparatively mild, and the structure of its principle and above-mentioned V-shape is similar; But the radian at its two ends is bigger, and under the certain situation of girth, the cross section of arc is set to the space that air-flow is subdued provides more, can further reduce current rate, weakens noise.
Obviously, described arc can be circular arc, can also be the structure of similar circular arcs such as elliptic arc, and the radian of arc can be adjusted according to the air quantity in the bellows 4.
In the third set-up mode, the cross section of blade 3 can be set to the inclined-plane, and this inclined-plane is 30～60 predetermined angles of spending with the port lines that screws out end 71.Compare with the structure setting of above-mentioned V-shape, blade 3 only leaves the outlet 7 of bellows 4 obliquely with the one side end, and the opposite side inclined-plane that blade 3 does not change in the bellows 4 all can provide the space for the buffering of air-flow, and the effect of its noise reduction is better.
More than centrifugal blower provided by the present invention and blade thereof are described in detail.Used specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation just is used for helping to understand core concept of the present invention.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (7)
1. the blade of a centrifugal blower, described centrifugal blower comprises the bellows with outlet, be set with impeller in the described bellows, described impeller is provided with several described blades, it is characterized in that, the port lines that the cross section of described blade has with the back-out end of described outlet is the rake that predetermined angle arranges, and described predetermined angle arranges according to the air quantity in the described bellows.
2. blade as claimed in claim 1 is characterized in that, the cross section of described blade is the V-shape setting.
3. blade as claimed in claim 1 is characterized in that, the curved setting of the cross section of described blade.
4. blade as claimed in claim 1 is characterized in that, the cross section of described blade is the inclined-plane, and the predetermined angle that the port lines of described inclined-plane and described back-out end constitutes is between 30～60 degree.
5. a centrifugal blower comprises bellows and the impeller that is built in the described bellows, and described impeller is provided with blade, it is characterized in that, described blade is each described blade of above-mentioned 1-4.
6. centrifugal blower as claimed in claim 5 is characterized in that, described centrifugal blower also is provided with the fixed base for fixing described bellows.
7. centrifugal blower as claimed in claim 5 is characterized in that, the outlet of described bellows is provided with flange, and described back-out end is arranged on an end of described flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102205641A CN103256250A (en) | 2013-06-05 | 2013-06-05 | Centrifugal fan and blade thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102205641A CN103256250A (en) | 2013-06-05 | 2013-06-05 | Centrifugal fan and blade thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103256250A true CN103256250A (en) | 2013-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102205641A Pending CN103256250A (en) | 2013-06-05 | 2013-06-05 | Centrifugal fan and blade thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB620746A (en) * | 1943-03-23 | 1949-03-30 | Karl Baumann | Improvements in and relating to the manufacture of bladed impellers for centrifugal compressors and the like |
| US5207809A (en) * | 1991-06-18 | 1993-05-04 | Kuraco Limited | Grease extractor |
| TW512891U (en) * | 2001-12-26 | 2002-12-01 | Sheng-An Yang | Structure for vane blade of heat dissipation fan |
| CN1982727A (en) * | 2005-12-12 | 2007-06-20 | 国际商业机器公司 | Fan with improved heat dissipation |
-
2013
- 2013-06-05 CN CN2013102205641A patent/CN103256250A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB620746A (en) * | 1943-03-23 | 1949-03-30 | Karl Baumann | Improvements in and relating to the manufacture of bladed impellers for centrifugal compressors and the like |
| US5207809A (en) * | 1991-06-18 | 1993-05-04 | Kuraco Limited | Grease extractor |
| TW512891U (en) * | 2001-12-26 | 2002-12-01 | Sheng-An Yang | Structure for vane blade of heat dissipation fan |
| CN1982727A (en) * | 2005-12-12 | 2007-06-20 | 国际商业机器公司 | Fan with improved heat dissipation |
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Application publication date: 20130821 |