CN202732401U - Multilayer fan blade structure and centrifugal fan - Google Patents

Abstract

Provided are a multilayer fan blade structure and a centrifugal fan. The centrifugal fan comprises a casing and the multilayer fan blade structure. The multilayer fan blade structure is arranged in the casing and provided with a hub, a first fan blade group and a second fan blade group. The first fan blade group and the second fan blade group are respectively formed by extending outwards on the periphery of the hub, the first fan blade group is located on the second fan blade group, and the first fan blade group and the second fan blade group are respectively contained in a base casing portion arranged on the casing and a casing cover portion located on the base casing portion. Therefore, the effects of improving the integral fan performance and saving cost and working time can be achieved.

Description

Laminated fan-leaf structure and centrifugal fan

Technical field

The utility model relates to a kind of blade structure and centrifugal cutter, espespecially a kind of have to reach promote whole fan performance, and then effectively reach laminated fan-leaf structure and the centrifugal fan of saving cost and saving the effect in man-hour.

Background technique

Along with electronic product (such as notebook computer) towards high-performance, high frequency, high-speed and lightening developing rapidly, cause the heating temperature of electronic product more and more higher, thereby produce easily wild effect, affect production reliability, so existing electronic product often utilizes a centrifugal fan as sink, but the air output of single centrifugal fan is limited to forced heat radiation effect in this electronic product, so the dealer, just develops two centrifugal fans in order to address the above problem and be subjected to spatial constraints in the electronic product.

See also Figure 1A, Figure 1B, Fig. 1 C shows, known pair of centrifugal fan 1 comprises a big fan 10 and a small fan 12, this big fan 10 is provided with one first wind inlet 101, one first exhaust outlet 102 and one first impeller 103, this first wind inlet 101 is opened on the top of this big fan 10, and itself and the first exhaust outlet 102 define a containing space 105 jointly, this containing space 105 is in order to be installed with described the first impeller 103, and these big fan 10 bottom inside centre axles are provided with one first beam barrel 107, these the first beam barrel 107 outsides are arranged with one first silicon steel plate group 108, and this first impeller 103 is hubbed on the first relative beam barrel 107, and it covers relatively this first silicon steel plate group 108.

The outside of the aforementioned small fan 12 of person convexes with a plurality of protruding pinnas 121 in addition, provided a perforation 1211 on the described protruding pinna 121, a plurality of lockholes 109 that 1211 pairs of described perforations have on should the bottom outside of big fan 10, and by a plurality of spiral locks 14 (such as screw) sequentially lock as described in relatively perforation 1211 with as described in lockhole 109 interior secure bond, make this small fan 12 and its be positioned at this big fan 10 tops, and this small fan 12 is provided with one second wind inlet 122, one second exhaust outlet 123 and one second impeller 124, this second wind inlet 122 is opened on the top of this small fan 12, the air-out direction of opposite this first exhaust outlet 102 of the air-out direction of this second exhaust outlet 123, and itself and the second wind inlet 122 define a holding space 126 jointly, and this holding space 126 is in order to be installed with described the second impeller 124.

Moreover aforementioned small fan 12 bottom inside centre axles are provided with one second beam barrel 127, these the second beam barrel 127 outsides are arranged with one second silicon steel plate group 128, and this second impeller 124 is hubbed on the second relative beam barrel 127, and it covers relatively this second silicon steel plate group 128, so by large and small fan 10, first and second exhaust outlet 102 of 12, the 123 guiding fluids heater element forced heat radiation in the electronic product (such as notebook computer), so as to promoting the effect of whole air output.

Though known pair of centrifugal fan 1 can promote the effect of whole air output, but its successful is unclear, and then extend again another problem, because the first impeller 103 its upper blade directions of described big fan 10 are not identical with the second impeller 124 its upper blade directions of small fan 12, both segment fluid flows of being guided out of the first exhaust outlet 102 of the second exhaust outlet 123 that makes small fan 12 and big fan 10, can be in described large, small fan 10, disturb mutually (such as collision) arround in the of 12 and form eddy current, illustrate such as 1C, causing the flow field to have some setbacks, and then can't promote the performance of whole fan.

In addition, when assembly, must small fan 12 be locked on big fan 10 by a plurality of spiral locks 14, assemble man-hour so that cause easily to expend, and then because of described large, small fan 10,12 all is the centrifugal fan of independent part, so big fan 10 turns round with the impeller (i.e. the first impeller 103 and the second impeller 124) that small fan 12 is both distinctly controlled separately by the circuit board in it, therefore, so that cause easily big fan 10 and small fan 12 both the impeller rotating speed can't be consistent separately, and then because providing power supply to greatly, small fan 10,12, so cause comparatively power consumption and cost to increase.

The above, known technology has following shortcoming:

1. the flow field has some setbacks, and then can't promote the performance of whole fan;

2. expend assembling man-hour and expend power supply;

3. cost increases.

Therefore, how to solve above-mentioned public problem and disappearance, the creator who is this case desires most ardently the direction place that research improves with the relevant manufacturer that is engaged in the industry.

The model utility content

For this reason, for effectively solving the above problems, main purpose of the present utility model is providing a kind of laminated fan-leaf structure with the performance that promotes whole fan.

Another purpose of the present utility model is that a kind of laminated fan-leaf structure of saving cost, saving assembling man-hour and saving power supply that has is being provided.

Another purpose of the present utility model is that a kind of centrifugal fan with the performance that promotes whole fan is being provided.

Another purpose of the present utility model is that a kind of centrifugal fan of saving cost, saving assembling man-hour and saving power supply that has is being provided.

For reaching above-mentioned purpose, the invention provides a kind of laminated fan-leaf structure, comprise a wheel hub, one first flabellum group and one second flabellum group, this wheel hub has a top and a sidepiece, this sidepiece one end extends axially formation along this top periphery, and it is provided with at least one the first extension area and at least one the second extension area, this is first years old, two extension areas lay respectively on the end and the other end thereof of adjacent this sidepiece of this sidepiece outer circumferential side, and described first, two flabellum groups have respectively a plurality of second blades of a plurality of the first blades and adjacent described the first blade, and described first, two blades are respectively from the first relative extension area and the second extension area formation that stretches out; By the design of this structure of the utility model, get the performance that effectively reaches the whole centrifugal fan of lifting, and then more effective effect of saving cost, saving man-hour and saving power supply that reaches.

The utility model provides a kind of centrifugal fan in addition, comprise a housing and a laminated fan-leaf structure, this housing comprises a basic shell section, one cap section and at least one dividing plate, this base shell section has one first wind inlet, the perforate of one first exhaust outlet and relative this first wind inlet, this first wind inlet and the first exhaust vent define a containing space jointly, this perforate and dividing plate are located at respectively a side and the opposite side thereof of this relative this cap section of base shell section, and this dividing plate has the through hole of this perforate of connection, and described cap section is located on relative basic shell section one side, and it has one second wind inlet and one second exhaust outlet, this second wind inlet and the second exhaust outlet define a holding space jointly, this holding space is communicated with aforementioned containing space, and it has one first open sides, is communicated with relatively described perforate;

Aforementioned laminated fan-leaf structure is located in the described housing, and it comprises a wheel hub, one first flabellum group and one second flabellum group, this wheel hub has a top and a sidepiece, this sidepiece one end extends axially formation along this top periphery, and be provided with at least one the first extension area and at least one the second extension area, this is first years old, on the end and the other end thereof of two extension areas respectively at adjacent this sidepiece of this sidepiece outer circumferential side, and described first, two flabellum groups have respectively a plurality of the first blades and a plurality of the second blade, adjacent described the second blade of described the first blade, and itself and described the second blade are respectively from this first extension area formation that stretches out, and described first, two flabellum groups are installed with respectively in aforementioned holding space and containing space, and it each other by this baffle region separately; By the design of centrifugal fan of the present utility model, get and effectively allow the flow field smooth and easy, so as to promoting blast and the air quantity of centrifugal fan, and then effectively reach again the effect of saving cost, saving assembling man-hour and saving power supply.

Description of drawings

Figure 1A is known combination schematic perspective view;

Figure 1B is known exploded perspective schematic representation;

Fig. 1 C is known enforcement aspect schematic perspective view;

Fig. 2 is the combination schematic perspective view of the first preferred embodiment of the present utility model;

Fig. 3 A is the side perspective schematic representation of Fig. 2 of the present utility model;

Fig. 3 A is the top perspective schematic representation of Fig. 2 of the present utility model;

Fig. 4 is the combination schematic perspective view of the second preferred embodiment of the present utility model;

Fig. 5 is the exploded perspective schematic representation of the second preferred embodiment of the present utility model;

Fig. 6 is the generalized section of the second preferred embodiment of the present utility model;

Fig. 7 is the enforcement aspect schematic perspective view of the second preferred embodiment of the present utility model.

The primary component symbol description

Laminated fan-leaf structure ... 2

Wheel hub ... 21

Top ... 211

Sidepiece ... 212

The first extension area ... 2121

The second extension area ... 2122

The first flabellum group ... 214

The first blade ... 2141

The second flabellum group ... 215

The second blade ... 2151

Clearance space ... 216

Housing ... 3

Base shell section ... 31

The first wind inlet ... 311

The first exhaust outlet ... 312

Perforate ... 313

Containing space ... 314

The second open sides ... 3141

Groove ... 315

Perforation ... 3151

Convex body ... 316

Cover plate ... 32

Beam barrel ... 33

Cap section ... 35

The second wind inlet ... 351

The second exhaust outlet ... 352

Holding space ... 354

The first open sides ... 3541

Groove ... 355

Dividing plate ... 36

Through hole ... 361

The first dividing plate ... 363

Snap part ... 364

Extending end ... 3641

Collude end ... 3642

Second partition ... 365

Fixed hole ... 3651

Silicon steel plate group ... 37

Centrifugal fan ... 4

Fixed block ... 5

Embodiment

Characteristic on above-mentioned purpose of the present utility model and structure thereof and the function will be explained according to appended graphic preferred embodiment.

The utility model provides a kind of laminated fan-leaf structure and centrifugal fan, sees also Fig. 2, Fig. 3 A shows, is the schematic perspective view of the first preferred embodiment of the present utility model; This laminated fan-leaf structure 2 comprises a wheel hub 21, one first flabellum group 214 and one second flabellum group 215, this wheel hub 21 has a top 211 and a sidepiece 212, these sidepiece 212 1 ends extend axially formation along these top 211 peripheries, and it is provided with at least one the first extension area 2121 and at least one the second extension area 2122, and aforementioned first and second extension area 2121,2122 lays respectively on the end and the other end of adjacent this sidepiece 212 of these sidepiece 212 outer circumferential sides.

Aforementioned the first flabellum group 214 of person has a plurality of the first blades 2141 in addition, described the first blade 2141 is from the first extension area 2121 of this sidepiece 212 formation that stretches out, that is the outer circumferential side of this sidepiece 212 top forms a plurality of blades of first layer (being a plurality of the first blades 2141).This second flabellum group 215 has a plurality of the second blades 2151, described the second blade 2151 is from the second extension area 2122 of described sidepiece 212 formation that stretches out, and adjacent described the first blade 2141, that is the outer circumferential side of this sidepiece 212 below forms a plurality of blades of the second layer (being a plurality of the second blades 2151), and a plurality of blades of adjacent this first layer, and then make and form a plurality of blades of multilayer on the sidepiece 212 of this wheel hub 21.

And on sidepiece 212 outer circumferential sides of this preferred embodiment, explain to form 2 layers of a plurality of blade, but be not limited to this; When implementation, the user can in advance according to the demand of blast and air quantity, form on sidepiece 212 outer circumferential sides of the aforementioned wheel hub 21 of design modifying such as 3 layers of a plurality of blade, 4 layers of a plurality of blade ... the rest may be inferred, closes first Chen Ming.

Moreover consult Fig. 2, Fig. 3 A, Fig. 3 B shows, described first and second blade 2141,2151 adjacent one another are being crisscross arranged, and aforementioned a plurality of the first blade 2141 direction and a plurality of the second blades 2151 direction that stretches out that stretches out is identical; And explain with the length of described the first blade 2141 length less than this second blade 2151 in described first and second blade 2141 of this preferred embodiment, 2151 length, be not limited but do not regard it as, also can be the length of described the first blade 2141 more than or equal to the length of described the second blade 2151.And having a clearance space 216 between described the first flabellum group 214 and adjacent the second flabellum group 215, this clearance space 216 is in order to make described first and second blade 2141,2151 spaced apart.

So by the design of laminated fan-leaf structure 2 of the present utility model, get and effectively reach hoisting wind pressure and air quantity, the relative performance that has also promoted whole centrifugal fan.

In addition, owing to form a plurality of blades (being a plurality of first and second blades 2141,2151) of multilayer on the outer circumferential side of described wheel hub 21, and the design of described first and second blade 2141,2151 settings interlaced with each other, so that when manufacturing is shaped laminated fan-leaf structure 2, get the effect that effectively reaches the quick and convenient demoulding, and then more effective reaching saved man-hour and cost-effective effect person.

See also Fig. 2, Fig. 4, Fig. 5, Fig. 6 show, show the schematic perspective view of the second preferred embodiment of the present utility model; This better enforcement mainly is that the laminated fan-leaf structure 2 with aforementioned the first preferred embodiment is applied on the centrifugal fan 4, that is aforementioned centrifugal fan 4 comprises a housing 3 and a laminated fan-leaf structure 2, described laminated fan-leaf structure 2 is identical with aforementioned the first preferred embodiment in structure and its effect of connection relationship of this better enforcement, so again do not give unnecessary details at this.

In addition the aforementioned housing 3 of person comprises a basic shell section 31, one cap section 35 and at least one dividing plate 36, wherein should base shell section 31 have one first wind inlet 311, one first exhaust outlet 312, one groove 315, one perforate 313 and a cover plate 32, this first wind inlet 311 and the first exhaust outlet 312 define a containing space 314 jointly, this containing space 314 is in order to be installed with the second relative flabellum group 215, and it is provided with the second open sides 3141 of this perforate 313 of connection, aforementioned this cover plate 32 is towards moving relative to the second open sides 3141 directions that should base shell section 31, to cover on this second open sides 3141.One beam barrel 33 is convexly equipped with on cover plate 32 1 sides in this containing space 314, a sheathed silicon steel plate group 37 on its outer circumferential side, and this beam barrel 33 is pivoted mutually with relative aforementioned wheel hub 21, make this wheel hub 21 cover relative silicon steel plate group 37, and described the first wind inlet 311 is formed on the cover plate 32 of adjacent this beam barrel 33, and relatively this perforate 313.

Moreover aforementioned perforate 313 is located at respectively this base shell section 31 relative these cap section 35 1 sides and opposite sides thereof with dividing plate 36, and aforementioned grooves 315 is arranged with and is formed on these base shell section 31 relative these cap section 35 opposite sides, and adjacent these perforate 313 places, and use for being installed with relative dividing plate 35, in other words, be exactly that this perforate 313 provides described basic shell section 31 relative these cap section 35 1 sides, aforementioned separator plate 36 is installed with in the groove 315 on basic shell section 31 1 sides that have this perforate 313 in this containing space 314, hides the relatively perforates 313 of part to make this dividing plate 36.

Continuous consult Fig. 5, Fig. 6 shows, has a plurality of perforations 3151 in the aforementioned grooves 315, described perforation 3151 provides formation along the bottom side of this groove 315.Aforementioned separator plate 36 has a through hole 361, one first dividing plate 363 and a second partition 365, this through hole 361 is communicated with this perforate 313 and containing space 314, this first dividing plate 363 is located in described containing space 314 interior a part of grooves 315 away from this first exhaust outlet 312,365 of this second partitions are installed with in another part groove 315 of this containing space 314 interior adjacent these the first exhaust outlets 312, make a be sticked end of relatively described second partition 365 of an end of the first dividing plate 363 in this groove 315.

Aforementioned first and second dividing plate 363,365 of person is positioned at described clearance space 216 in addition, and the outer circumferential side of its perforate of jointly defining each other 313 adjacent these sidepieces 212, and will be located in the first flabellum groups 214 that the second flabellum group 215 in this containing space 314 and described cap section 35 have in the holding space 354 and distinguish, in brief, aforementioned exactly first and second flabellum group 214,215 is distinguished by aforementioned separator plate 36.

Aforementioned the first dividing plate 363 of person has a plurality of snap parts 364 again, described snap part 364 is arranged on place, relative two corners on the side of this first dividing plate 363, and it is provided with an extending end 3641 and and colludes end 3642, and this colludes end 3642 and outwards protrude out formation from the end of this extending end 3641 away from this first dividing plate 363.

Moreover described second partition 365 is provided with a plurality of fixed holes 3651, described fixed hole 3651 provides formation along adjacent these second partition 365 peripheries, and be communicated with corresponding described perforation 3151, and as described in sequentially wearing relatively by a plurality of fixed blocks 5 (such as screw piece, rivet) fixed hole 3651 with as described in perforation 3151 fix so that this this second partition 365 is fixed in the groove 315.

See also Fig. 4, Fig. 5 shows, and be aided with and consult shown in the 2nd, 3 figure, aforementioned cap section 35 be located at relatively should base shell section 31 1 sides on, that is this cap section 35 extends from a side direction that relatively should base shell section 31 have perforate 313 and consists of, in brief, it is one-body molded with basic shell section 31 to be exactly this cap section 35.And this cap section 35 has one second wind inlet 351 and one second exhaust outlet 352, and this second wind inlet 351 and the second exhaust outlet 352 define described holding space 354 jointly, and this holding space 354 is communicated with this containing space 314.

The first open sides 3541 that other the aforementioned containing space 314 of person has a relative aforementioned separator plate 36, and the relative perforate 313 of these first open sides, 3541 connections, it is used for this first flabellum group 214 and is installed with in this holding space 354.

Moreover described cap section 35 outsides are provided with a plurality of grooves 355, described groove 355 is arranged with and is formed on these cap section 35 contiguous these second exhaust outlets, 352 relative outsides, and be communicated with corresponding perforation 3151, the extending end 3641 that makes described snap part 364 is towards perforation 3151 that should containing space 314 inner groovies 315 is worn, and then protrude out in the relative groove 355, so that the hook part on the described extending end 3641 establishes with a convex body 316 that should be basic has on shell section 31 1 sides is blocked mutually, so as to fixing this first dividing plate 363.

In addition, opposite each other in aforementioned first and second exhaust outlet 312 of this better enforcement, 352 air-out direction, and the bore of this first exhaust outlet 312 explains less than the bore of this second exhaust outlet 352, but be not limited to this, also but design modifying is that this first and second exhaust outlet 312,352 air-out direction are mutually the same, and the bore of this first exhaust outlet 312 is more than or equal to the bore of this second exhaust outlet 352.

Moreover, by the first blade 2141 directions of aforementioned the first flabellum group 214 relation identical with the second blade 2151 directions of the second flabellum group 215, making arround this base shell section 31 and cap section 35 can't phase mutual interference (as shown in Figure 7) by described first and second exhaust outlet 312,352 a little fluids of deriving, smooth and easy with the whole flow field of effective lifting, and obviously improve the problem of known generation eddy current, and then just can reach the performance that promotes whole centrifugal fan 4.

So when this centrifugal fan 4 running, the first wind inlet 311 of this base shell section 31 is understood in the containing space 314 and holding space 354 that simultaneously fluid is directed into separately with the second wind inlet 351 of cap section 35, and by described the first flabellum group 214 and the second flabellum group 215 respectively for the fluid pressurized in holding space 354 and the containing space 314, derived by the second relative separately exhaust outlet 352 and the first exhaust outlet 312 again, so that this first, two exhaust outlets 312,352 fluids of deriving just the heater element in the relative electronic product (such as notebook computer) (such as central processing unit, north and south bridge wafer or display card wafer) forced heat radiation, provide pair effect of air outputs heat radiation so as to reaching, and then also promoted the effect of whole blast and air quantity.

Therefore, design by centrifugal fan 4 of the present utility model, just can guide out the effect of two air outputs so that only need to drive its upper first and second flabellum group 214,215 by single wheel hub 21, and the performance of the whole centrifugal fan 4 of more effective lifting and saving power supply.In addition, when assembly, because described wheel hub 21 being formed the design of two layers of a plurality of blade (being first and second flabellum group 214,215) on it, get and effectively reach the saving production hour, and the cost of saving centrifugal fan 4 interior part materials, as compared to known technology, the utility model has been saved a circuit board, a silicon steel plate group, the cost of material such as wheel hub.

The above, the utlity model has following advantage:

1. promote the performance of whole centrifugal fan;

2. saving cost;

3. save man-hour and save power supply.

Only the above only is better feasible embodiment of the present utility model, and all variations that utilizes the above-mentioned method of the utility model, shape, structure, device to do all should be contained in the interest field of this case.

Claims (19)

1. a laminated fan-leaf structure is characterized in that, comprising:

One wheel hub, have a top and a sidepiece, this sidepiece one end extends axially formation along this top periphery, and it is provided with at least one the first extension area and at least one the second extension area, and this first and second extension area lays respectively on the end and the other end thereof of adjacent this sidepiece of this sidepiece outer circumferential side;

One first flabellum group has a plurality of the first blades, and described the first blade is from this first extension area formation that stretches out; And

One second flabellum group has a plurality of the second blades, and described the second blade is from this second extension area stretch out formation and adjacent described the first blade.

2. laminated fan-leaf structure as claimed in claim 1 is characterized in that, adjacent one another are being crisscross arranged of described first and second blade, and the direction of described first and second blade is mutually the same.

3. laminated fan-leaf structure as claimed in claim 2 is characterized in that, have a clearance space between described the first flabellum group and adjacent this second flabellum group, and the length of described the first blade is less than the length of described the second blade.

4. laminated fan-leaf structure as claimed in claim 1 is characterized in that, the length of described the first blade is more than or equal to the length of described the second blade.

5. a centrifugal fan is characterized in that, comprising:

One housing, comprise a basic shell section, one cap section and at least one dividing plate, this base shell section has one first wind inlet, the perforate of one first exhaust outlet and relative this first wind inlet, this first wind inlet and the first exhaust outlet define a containing space jointly, this perforate and dividing plate are located at respectively a side and the opposite side thereof of this relative this cap section of base shell section, and this dividing plate has the through hole of this perforate of connection, and this cap section be located at relatively should base shell section one side on, and it has one second wind inlet and one second exhaust outlet, this second wind inlet and the second exhaust outlet define a holding space that is communicated with this containing space jointly, and this holding space has one first open sides, relatively this perforate of connection; And

One laminated fan-leaf structure, be located in this housing, and comprise:

One wheel hub, it has a top and a sidepiece, this sidepiece one end extends axially formation along this top periphery, and it is provided with at least one the first extension area and at least one the second extension area, and this first and second extension area lays respectively on the end and the other end thereof of adjacent this sidepiece of this sidepiece outer circumferential side;

One first flabellum group, it has a plurality of the first blades, and described the first blade is from this first extension area formation that stretches out; And

One second flabellum group, it has a plurality of the second blades, and described the second blade is from this second extension area stretch out formation and adjacent described the first blade, and this first and second flabellum group is installed with respectively in this holding space and containing space, and it to each other by this baffle region separately.

6. centrifugal fan as claimed in claim 5 is characterized in that, described basic shell section has a groove, and this groove is arranged with and is formed on the relatively opposite side of this cap section of this base shell section, and adjacent this tapping, and it is used for being installed with relative dividing plate.

7. centrifugal fan as claimed in claim 6 is characterized in that, has a plurality of perforations in the described groove, and described perforation provides formation along the bottom side of this groove.

8. centrifugal fan as claimed in claim 7 is characterized in that, the described cap section outside is provided with a plurality of grooves, and described groove is arranged with and is formed on contiguous this second exhaust outlet of this cap section relatively on the outside, and is communicated with corresponding perforation.

9. centrifugal fan as claimed in claim 8, it is characterized in that, described dividing plate is provided with one first dividing plate and a second partition, one end of this first dividing plate relatively end of this second partition that is sticked, and this first dividing plate has a plurality of snap parts, described snap part is arranged on place, relative two corners on the side of this first dividing plate, and it is provided with the end that colludes that an extending end and outwards protrudes out from this extending end, this extending end wears corresponding perforation and protrudes out in the relative groove, makes the colluding end on it establish with a convex body that should be basic has on shell section one side is blocked mutually.

10. centrifugal fan as claimed in claim 9, it is characterized in that, described second partition is provided with a plurality of fixed holes, described fixed hole provides formation along adjacent this second partition periphery, and be communicated with corresponding described perforation, and sequentially wear corresponding described fixed hole and described perforation fixes by a plurality of fixed blocks.

11. centrifugal fan as claimed in claim 5, it is characterized in that, described containing space is provided with the second open sides of this perforate of connection, this base shell section also has a cover plate, one beam barrel is convexly equipped with on cover plate one side in this containing space, and be pivoted mutually with relative wheel hub, and this first wind inlet is formed on the cover plate of adjacent this beam barrel, and this cover plate covers on the second open sides.

12. centrifugal fan as claimed in claim 5 is characterized in that, the air-out direction of described first and second exhaust outlet is opposite each other or identical.

13. centrifugal fan as claimed in claim 5 is characterized in that, the bore of described the first exhaust outlet is less than the bore of this second exhaust outlet.

14. centrifugal fan as claimed in claim 5 is characterized in that, the bore of described the first exhaust outlet is more than or equal to the bore of this second exhaust outlet.

15. centrifugal fan as claimed in claim 5 is characterized in that, adjacent one another are being crisscross arranged of described first and second blade, and the direction of described first and second blade is mutually the same.

16. centrifugal fan as claimed in claim 5, it is characterized in that, have a clearance space between described the first flabellum group and adjacent this second flabellum group, and this first and second dividing plate is positioned at this grid space, and the outer circumferential side of its adjacent this sidepiece of perforate that jointly defines each other.

17. centrifugal fan as claimed in claim 5 is characterized in that, the length of described the first blade is less than the length of described the second blade.

18. centrifugal fan as claimed in claim 5 is characterized in that, the length of described the first blade is more than or equal to the length of described the second blade.

19. centrifugal fan as claimed in claim 5 is characterized in that, aforementioned basic shell section and cap section are one-body molded.

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