CN102518604B - Centrifugal fan - Google Patents

Abstract

The invention discloses a centrifugal fan, which comprises a base plate and a side wall extending from the periphery of the base plate, wherein the side wall is provided with an air outlet; the side wall close to the air outlet is recessed to form a tongue part; the middle of the base plate is provided with a hole; a support part is arranged in the hole; a rib connecting the support part and the base plate extends from the support part opposite to the tongue part outwards; the base plate close to the tongue part is provided with at least one through hole; and the through hole is arranged between the rib and the tongue part and can timely eliminate surplus air accumulated at the through hole so as to reduce noise.

Description

Centrifugal cutter

Technical field

The present invention relates to a kind of centrifugal cutter, refer to especially a kind of centrifugal cutter having compared with low noise.

Background technique

Current, along with developing rapidly of computer industry, the heat that the heat-generating electronic elements such as micro-chip processor produce is more and more many.For these unnecessary heats are effectively distributed, existing method is the radiator that is sticked on the surface of heat-generating electronic elements, then one fan is set on this radiator, 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, for the radiating efficiency of fan is further improved, must increase the speed of rotation of fan.But the noise that rotation speed of the fan will cause fan to produce when improving increases considerably, and make to be positioned near the user of this fan, do not feel well, cannot 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, this fan frame 10 arranges respectively the first wind inlet 12 and the second wind inlet 14 in end face and bottom surface, in sidewall, close on the inwardly outstanding tongue 16 that forms of exhaust outlet place, impeller 20 arranges some flabellums 26 in wheel hub 22 peripheries, on this impeller 20, be also connected with a disk 24, this disk 24 is sticked at the end of flabellum 26 and is positioned at the upside of flabellum 26, because flabellum 26 and tongue 16 are nearest, when entering from intake grill 12 and 14, wind can produce unnecessary air quantity at tongue 16, 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 having compared with low noise.

A kind of centrifugal cutter, comprise a base plate and the sidewall being extended to form by this base plate periphery, on this sidewall, offer an exhaust outlet, this sidewall closes on the inwardly outstanding tongue that forms of this exhaust outlet place, in the middle of this base plate, a perforate is set, in perforate inside, one supporting portion is set, from this supporting portion over against this tongue, stretch out and form the rib of a connection supporting portion and base plate, on described base plate, close on this tongue at least one through hole is set, this through hole is located between rib and tongue.

Compared with prior art, near above-mentioned centrifugal cutter tongue, establish through hole, can get rid of in time the unnecessary wind that extruding is piled up herein, thereby reduce noise.

Accompanying drawing explanation

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 in Fig. 1.

Fig. 3 is the three-dimensional exploded view of a centrifugal centrifugal cutter in prior art.

Primary component symbol description

Fan frame	100
		Impeller	200
Base plate	140
		Sidewall	160
Cover plate	120
		Wind inlet	122
Perforate	142
		Supporting portion	144
Rib	146a、146b
		Through hole	148
Body	150
		Arcuation face	162
Face directly	164
		Exhaust outlet	180
Tongue	190
		Wheel hub	220
Blade	240
		Space	300

Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.

Embodiment

Refer to Fig. 1 and Fig. 2, be respectively solid combination and the exploded view of the centrifugal cutter of a preferred embodiment of the present invention, this centrifugal cutter can be with a sink (not shown) combination for dispelling the heat to heat-generating electronic elements, as central processing unit (CPU), this centrifugal cutter comprises that a fan frame 100 and is contained in the impeller 200 in fan frame 100.

This fan frame 100 comprises a base plate 140, the cover plate 120 that is extended upward the sidewall 160 forming and be fixed on these sidewall 160 tops by these base plate 140 peripheries.In the middle of this base plate 140, offer the perforate 142 of two arcs.One circular support portion 144 is located between two perforates 142, this supporting portion 144 is connected with base plate 140 around also passing through two rib 146a, 146b by two perforates 142, these ribs 146a, 146b are that 144 outer rim stretches out and forms from supporting portion, and a body 150 extends upward and forms in the middle of this supporting portion 144.

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, close to this exhaust outlet 180, be on this arcuation face 162 tongue 190 is set, these tongue 190 ecto-entads are outstanding.Its center rib 146b is stretched out and is formed by supporting portion 144 with respect to this tongue 190, and this rib 146b is broadened to tongue 190 gradually by supporting portion 144, this rib 146b can broaden and also can broaden both sides simultaneously from a side, also can be upper and lower surface and broadens simultaneously.On this base plate 140, between tongue 190 and rib 146b, be also provided with two through hole 148, described through hole 148 ovalizes, and 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 position will be located on base plate 140, and close on tongue 190.Unnecessary air-flow between blade 240 and tongue 190 can be discharged in time by this through hole 148, thereby prevents that air-flow from, in tongue 190 places accumulation disturbance, reducing noise.Another rib 146a is stretched out and is formed by supporting portion 144 with respect to rib 146b, what two rib 146a, 146b were firm is fixed on supporting portion 144 on base plate 140, certainly, the number of described rib 146a and position are not subject to the restriction of the present embodiment, can be two, three or more.The shape of this cover plate 120 is similar to the shape of base plate 140, in the middle of described cover plate 120, offers a circular wind inlet 122.

This impeller 200 comprises a wheel hub 220 and by these wheel hub 220 peripheries, is outwards some blades 240 of radiated entends.The top of impeller 200 and bottom are corresponding with cover plate 120 and the base plate 140 of fan frame 100 respectively, and described 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 described body 150, thereby this impeller 200 is assemblied in bearing and is rotatably mounted in fan frame 100 by mandrel.

During assembling, by the mandrel in wheel hub 220, be assemblied in the bearing in body 150, thereby impeller 200 is assembled on base plate 140, cover plate 120 correspondences are covered on to sidewall 160 tops, can be fixed by structures such as screw buckles, thereby form a semi-enclosed space 300, impeller 200 is accommodated in semi-enclosed space 300.

During work, impeller 200 drives air-flow around to rotate together, wind inlet 122 and the perforate 142 base plate 140 on of extraneous air-flow from cover plate 120 enters in fan frame 100, rotation along with blade 240, air-flow in fan frame 100 is discharged from exhaust outlet 180, and the unnecessary air-flow between blade 240 and tongue 190 can be discharged in time by this through hole 148, thereby prevent that air-flow from, in tongue 190 places accumulation disturbance, reducing noise.In addition, because the rib 146b at tongue 190 places is broadened, the air-flow entering from this is reduced, reduce the air-flow of piling up at tongue 190 places, thereby further reduce noise.

Below with specific experiment data declaration under same number of revolutions, be 1.5mm axle center, 13 prismatic blades, centrifugal cutter of the present invention is lower than traditional centrifugal cutter noise.

Table 1 measured load with the 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 with two ribs that table 2 is traditional

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

From table 1 and table 2, close at voltage, revolution electric current is close, and in the identical situation of corresponding revolution, centrifugal cutter of the present invention is all low than the centrifugal cutter noise in prior art with the identical rib number of blade.

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

In the present invention, can be separately the width of rib 146 by expansion tongue 190 places reduce noise, also can be separately by through hole 148 be set carry out noise-decreasing closing on tongue 190 places, can also be by the two in conjunction with better reaching the object that reduces noise.

Be understandable that, for the person of ordinary skill of the art, can make other various corresponding changes and distortion by technical conceive according to the present invention, and all these change and distortion all should belong to the protection domain of the claims in the present invention.

Claims (6)

1. a centrifugal cutter, comprise a base plate and the sidewall being extended to form by this base plate periphery, on this sidewall, offer an exhaust outlet, this sidewall closes on the inwardly outstanding tongue that forms of this exhaust outlet place, one perforate is set in the middle of this base plate, in perforate inside, one supporting portion is set, from this supporting portion over against this tongue, stretch out and form the rib of a connection supporting portion and base plate, it is characterized in that: on described base plate, close on this tongue at least one through hole is set, this through hole is located between rib and tongue, and between described through hole and perforate, isolation arranges.

2. centrifugal cutter as claimed in claim 1, is characterized in that: described sidewall comprises that an arcuation face and faces directly, and what described tongue was located at this arcuation face closes on exhaust outlet place, and described through hole is near tongue and along the arc of arcuation face to configuration arranged side by side.

3. centrifugal cutter as claimed in claim 1, is characterized in that: described rib is widened to tongue gradually from supporting portion.

4. centrifugal cutter as claimed in claim 3, is characterized in that: described rib only wherein a side from supporting portion, to tongue, widen gradually.

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

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

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