CN101392762B

CN101392762B - Centrifugal fan

Info

Publication number: CN101392762B
Application number: CN2007100773368A
Authority: CN
Inventors: 黄清白; 赵志辉; 张�杰
Original assignee: Hong Jun Precision Industry Co ltd; Fuzhun Precision Industry Shenzhen Co Ltd
Current assignee: Hong Jun Precision Industry Co ltd; Fuzhun Precision Industry Shenzhen Co Ltd
Priority date: 2007-09-21
Filing date: 2007-09-21
Publication date: 2012-08-22
Anticipated expiration: 2027-09-21
Also published as: US20090081038A1; CN101392762A

Abstract

The invention discloses a centrifugal fan, which comprises a base plate and a sidewall formed by extending the circumference of the base plate. The sidewall is provided with an air outlet. The sidewall close to the air out protrudes inwards to form a tongue part. The middle of the base plate is provided with at least one opening hole, and a support part is arranged in the opening hole. The support part facing the tongue part extends outwards to form a rib connected with the support part and the base plate. The rib widens gradually from the support part to the tongue part. The widening of the rib reduces the air amount of the tongue part and disturbance of redundant input air in the tongue part, thereby reducing the noise.

Description

Centrifugal cutter

Technical field

The present invention relates to a kind of centrifugal cutter, be meant a kind of centrifugal cutter that has than low noise especially.

Background technique

Current, along with developing rapidly of computer industry, the heat that heat-generating electronic elements such as little process chip produce is more and more many.For the heat that these are unnecessary effectively distributes; Existing method is the radiator that is sticked on the surface of heat-generating electronic elements; One fan is set on this radiator then; The cooling blast that utilizes this fan to produce carries out forced heat radiation to this radiator, thereby the heat that heat-generating electronic elements is produced leaves.Because the size of air-flow that fan produces depends on the rotating speed of fan,, must increase the speed of rotation of fan for the radiating efficiency that makes fan is further improved.But the noise that rotation speed of the fan will cause fan to produce when improving increases considerably, and near the user who is positioned at this fan is not felt well, and can't stand even.

As shown in Figure 3; One centrifugal cutter comprises a fan frame 10 and is contained in the impeller 20 in this fan frame 10 that this fan frame 10 is provided with first wind inlet 12 and second wind inlet 14 respectively in end face and bottom surface, closes on the inwardly outstanding tongue 16 that forms in exhaust outlet place in sidewall; Impeller 20 is provided with some flabellums 26 in wheel hub 22 peripheries; Also be connected with a disk 24 on this impeller 20, this disk 24 is sticked at the terminal of flabellum 26 and is positioned at the upside of flabellum 26, because flabellum 26 is nearest with tongue 16; When wind can produce unnecessary air quantity at tongue 16 when

intake grill

12 and 14 gets into, unnecessary air quantity is squeezed disturbance and causes noise at tongue 16 places.

Summary of the invention

In view of this, be necessary to provide a kind of centrifugal cutter that has than low noise.

A kind of centrifugal cutter; Comprise a base plate and, offer an exhaust outlet on this sidewall that this sidewall closes on the inwardly outstanding tongue that forms in this exhaust outlet place by the sidewall that this base plate periphery extends to form; At least one perforate is set in the middle of this base plate; In perforate set inside one supporting portion, stretching out over against this tongue from this supporting portion forms the rib of a connection supporting portion and base plate, and this rib is widened to tongue from the supporting portion gradually.

A kind of centrifugal cutter comprises a base plate and by the sidewall that this base plate periphery extends to form, offers an exhaust outlet on this sidewall; This sidewall closes on the inwardly outstanding tongue that forms in this exhaust outlet place; In the middle of this base plate a perforate is set, in perforate set inside one supporting portion, stretching out over against this tongue from this supporting portion forms the rib of a connection supporting portion and base plate; Close on this tongue on the said base plate at least one through hole is set, this through hole is located between rib and the tongue.

Compared with prior art, above-mentioned centrifugal cutter increases the rib width at tongue place, can reduce the air output at tongue place; Reduce unnecessary air quantity in the tongue disturbance, in addition, near the centrifugal cutter tongue, establish through hole; Can in time get rid of the unnecessary wind that extruding is herein piled up, thereby reduce noise.

Description of drawings

Fig. 1 is the three-dimensional combination figure of centrifugal cutter one preferred embodiment of the present invention.

Fig. 2 is the three-dimensional exploded view of centrifugal cutter among Fig. 1.

Fig. 3 is the three-dimensional exploded view of a centrifugal centrifugal cutter in the existing technology.

Embodiment

See also Fig. 1 and Fig. 2; Be respectively the solid combination and the exploded view of the centrifugal cutter of the present invention's one preferred embodiment; This centrifugal cutter can be used for heat-generating electronic elements is dispelled the heat with a sink (figure does not show) combination; Like central processing unit (CPU), this centrifugal cutter comprises that a fan frame 100 and is contained in the impeller 200 in the fan frame 100.

The cover plate 120 that this fan frame 100 comprises a base plate 140, extended upward the sidewall 160 that forms and be fixed in these sidewall 160 tops by these base plate 140 peripheries.Offer the perforate 142 of two arcs in the middle of this base plate 140.One circular support portion 144 is located between two perforates 142; This supporting portion 144 by two perforates 142 around and link to each other with base plate 140 through two

rib

146a, 146b; These

ribs

146a, 146b are that 144 outer rim stretches out and forms from the supporting portion, and a body 150 extends upward in the middle of this supporting portion 144 and forms.

This sidewall 160 is semi-enclosed structures; This sidewall 160 comprises that an arcuation face 162 and faces 164 directly; On this sidewall 160, offer an exhaust outlet 180, approach this exhaust outlet 180 and be in a tongue 190 is set on this arcuation face 162, these tongue 190 ecto-entads are outstanding.Its center rib 146b is stretched out by supporting portion 144 with respect to this tongue 190 to form; And this rib 146b is broadened to tongue 190 by supporting portion 144 gradually; This rib 146b can broaden from a side and also can broaden simultaneously both sides, also can be upper and lower surfaces and broadens simultaneously.Another rib 146a is stretched out by supporting portion 144 with respect to rib 146b and forms; Two rib 146a, firm supporting portion 144 is fixed on the base plate 140 of 146b; Certainly, the number of said rib 146a and position do not receive the restriction of present embodiment, can be two, three or more.The shape of this cover plate 120 is similar with the shape of base plate 140, offers a circular wind inlet 122 in the middle of the said cover plate 120.

This impeller 200 comprises that a wheel hub 220 reaches the some blades 240 that outwards are radial extension by these wheel hub 220 peripheries.The top of impeller 200 is corresponding with base plate 140 with the cover plate 120 of fan frame 100 respectively with the bottom, and said blade 240 is clockwise direction, and blade 240 ends are counterclockwise crooked.This wheel hub 220 comprises a mandrel (figure is mark not).One bearing (figure is mark not) is contained in the said body 150, fans in the frame 100 thereby this impeller 200 is assemblied in to be rotatably mounted in the bearing through mandrel.

During assembling; Mandrel through in the wheel hub 220 is assemblied in the bearing in the body 150; Thereby impeller 200 is assembled on the base plate 140, with cover plate 120 corresponding be covered on sidewall 160 tops, can be fixed through structures such as screw buckles; Thereby form a semiclosed space 300, impeller 200 is accommodated in semi-enclosed space 300.

During work, air-flow rotated together around impeller 200 drove, and extraneous air-flow gets in the fan frame 100 from wind inlet 122 and the perforate on the base plate 140 142 on the cover plate 120, and along with the rotation of blade 240, the air-flow in the fan frame 100 is discharged from exhaust outlet 180.Because the rib 146b at tongue 190 places is broadened, make from the air-flow of this entering and reduce, reduce the air-flow of piling up at tongue 190 places, thereby reduce noise.

For further reducing the noise of centrifugal cutter, two through holes 148 can be set on base plate 140.As shown in Figure 2, these through hole 148 ovalizes, between tongue 190 and rib 146b, and this through hole 148 near tongue 190 and along the arc of arcuation face 162 to configuration arranged side by side.The quantity of this through hole 148 and shape can change according to specific embodiments, but the position will be located on the base plate 140, and close on tongue 190.Unnecessary air-flow between blade 240 and the tongue 190 can in time be discharged through this through hole 148, thereby prevents air-flow accumulation disturbance at tongue 190 places, reduces noise.

Explain under same number of revolutions with concrete laboratory data below, be the 1.5mm axle center, 13 prismatic blades, centrifugal cutter of the present invention is lower than traditional centrifugal fan noise.

Table 1 measured load with centrifugal cutter of two ribs of the present invention

Voltage	Revolution electric current	Corresponding revolution	Noise
				5.1	0.285	4000	39.9
4.1	0.22	3500	35.1
				3.3	0.17	3000	30.5
2.7	0.12	2500	25.8
				2.4	0.09	2000	22.6

The centrifugal cutter measured load that table 2 is traditional with two ribs

Voltage	Revolution electric current	Corresponding revolution	Noise
				5.2	0.29	4000	40.3
4.1	0.225	3500	36.2
				3.3	0.175	3000	30.7
2.8	0.14	2500	27.4
				2.4	0.09	2000	23.5

Visible by table 1 and table 2, close at voltage, revolution electric current is close, and under the identical situation of corresponding revolution, centrifugal cutter of the present invention is all low than the centrifugal cutter noise that has the identical rib number of blade in the existing technology.

In addition, the present invention is owing to be provided with through hole 148 near tongue 190, and the unnecessary air quantity of piling up at tongue 190 places can in time be discharged through this through hole 148, avoids being disturbed, thereby reduces noise.

Among the present invention, can be separately the width of rib 146 through expansion tongue 190 places reduce noise, also can be separately through through hole 148 is set comes noise-decreasing closing on tongue 190 places, can also the two be combined better reach the purpose that reduces noise.

Claims

1. centrifugal cutter; Comprise a base plate and, offer an exhaust outlet on this sidewall that this sidewall closes on the inwardly outstanding tongue that forms in this exhaust outlet place by the sidewall that this base plate periphery extends to form; At least one perforate is set in the middle of this base plate; In perforate set inside one supporting portion, it is characterized in that: stretching out over against this tongue from this supporting portion forms the rib of a connection supporting portion and base plate, and this rib is widened to tongue from the supporting portion gradually.

2. centrifugal cutter as claimed in claim 1 is characterized in that: said rib only wherein a side widen gradually to tongue from the supporting portion.

3. centrifugal cutter as claimed in claim 1 is characterized in that: the both sides of said rib are widened to tongue from the supporting portion gradually.

4. centrifugal cutter as claimed in claim 1 is characterized in that: at least one through hole is set on the said base plate, and this through hole is located between rib and the tongue, and closes on this tongue.

5. centrifugal cutter as claimed in claim 1 is characterized in that: said supporting portion stretches out and forms the rib of some connections supporting portion and base plate.

6. centrifugal cutter as claimed in claim 1 is characterized in that: said centrifugal cutter also comprises an impeller, and this impeller comprises a wheel hub and outwards is the radial some blades that extend to form by this wheel hub.

7. centrifugal cutter as claimed in claim 1 is characterized in that: said centrifugal cutter also comprises a cover plate, and a wind inlet is set on this cover plate.