CN2343395Y

CN2343395Y - Multi-wing type blade centrifugal fan

Info

Publication number: CN2343395Y
Application number: CN98201682.4U
Authority: CN
Inventors: 李明烈
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-09
Filing date: 1998-03-09
Publication date: 1999-10-13
Anticipated expiration: 2008-03-09

Abstract

The utility model relates to a subminiature centrifugal fan with a plurality of wing type blades, which comprises an aluminum bottom board, a fan blade body, a coil shaft, a circuit board and an upper cover, wherein the aluminum bottom board is provided with a helical fan air groove, an air outlet is formed on the aluminum bottom board and the fan blade body is positioned in the air groove. A thin ring of the fan blade body is provided with a plurality of wing type blades, the center of an impeller is provided with a shaft post and the coil shaft and the circuit board are orderly positioned. The upper cover is locked and connected to the bottom board and is provided with a plurality of air inlets. Multiple air inlet spaces can be formed on the upper cover. The utility model increases the heat dissipation of PC cooling fans, is provided with a plurality of blades, has good flow guiding effect in flow passages and can change wind pressure and flow quantity easily through adjusting the inlet and outlet angles of blades. The utility model can largely increase wind pressure when the fan has smaller size.

Description

Multiple-airfoil type blade centrifugal fan

The utility model relates to a kind of multiple-airfoil type blade microminiature centrifugal fan, particularly a kind of multiple air intake space, structure of increase computer (PC) cooling fan radiating effect of forming.

Be used for the design of computer cooling fan now, design of the axial flow fan of employing or centrifugal fan design are arranged.The characteristic that wherein axial flow fan tool air quantity is big, blast is little, but when its air quantity one is sent, air quantity promptly leaves, cause the air quantity can't efficiently radiates heat, and axial flow fan is subjected to the restriction and the distinguished and admirable restriction in stays of installation position, cause air quantity can't deliver within instrument or the computer, portable type computer especially, its requirement be light, thin, so to place the possibility of axial fan less.The blast of centrifugal fan is big, be not subjected to the restriction of installation position, distinguished and admirable can turning to, so air quantity can be delivered to the inner space of instrument or computer, solving the shortcoming of axial flow fan, and the centrifugal fan characteristic is the important selection in a kind of design for the very high environment of the intricate arrangement of electronics finding, impedance.

The size of general centrifugal fan is owing to be subjected to the restriction in computer (PC) space, and the influence of motor dimension factor, and the extra runner spatial requirement of fluid centrifugal flow, make the effective length of blade, fan inlet area all be subjected to suitable restriction, the effect that very difficult performance is boosted.

In addition, present centrifugal cutter is because of the consideration on the structure arrangement, and all radial axial--flow blading is adopted in design, and it contradicts with the design of centrifugal runner again.

After the axial blade rotation, though can be because of the centrifugal outflow of existence forced draft of base plate, efficient greatly reduces; Secondly, it is relatively poor that the blast of the blade of axial flow form own promotes characteristic, can't bring into play the effect of voltage rise under the situation of poor efficiency; Moreover, because of the existence of base plate, air-flow can not be flowed along aerofoil profile is smooth and easy, cause eddy current and turbulent flow, therefore noise will raise, and also be one of present centrifugal computer (PC) fan unfavorable factor; In addition, the design that has existed, because of air-flow axially flows into, through blade pressurization, pressure improves, and but the existence because of base plate more increases pressure, and it is more difficult to cause extraneous air-flow desire to flow among the fan.

The purpose of this utility model is, a kind of multiple-airfoil type blade microminiature centrifugal fan is provided, and improves the defective of existing centrifugal cutter, and performance is improved more.

The utility model provides a kind of multiple-airfoil type blade microminiature centrifugal fan, comprising: a base plate which is provided with the fan air groove of a helical, and forms an exhaust outlet; One flabellum body, be positioned above-mentioned fan air groove, which is provided with a slim ring, this thin type ring is provided with a plurality of wing formula blades, this slim ring can be linked to the one or both sides of blade, and this slim ring is linked to an impeller with many supporting members, and this impeller is provided with a slotted eye, and convex with a jack-post on this impeller, so that a coil axes and a circuit board are positioned in this slotted eye in regular turn; And a loam cake, interlocking which is provided with multiple intake grill on aluminum soleplate.

The utility model provides a kind of multiple-airfoil type blade microminiature centrifugal fan, it is provided with a slim ring on flabellum body, this thin type ring is provided with a plurality of wing formula blades, this lobe numbers is regardless of, its Inlet cone angle and exit angle can change with the design environment demand, this slim ring can be linked to the one or both sides of blade, and this slim ring is linked to a round impeller with many supporting members, each supporting member can be designed to the prolongation of blade, possesses the part aerofoil profile, makes the flow field still keep smooth-going, this impeller is provided with a slotted eye, and convex with a jack-post on the center portion of this impeller, so that a coil axes and a circuit board can be positioned in this slotted eye the particular design of this flabellum body of mat in regular turn, make blade many, runner water conservancy diversion effect is obvious, by adjusting fan blade turnover bicker, change blast and flow easily, to be applied in the different design environments; Air-flow easily is inhaled into, promotes throughput and be easier to; Under less fan dimension, reach bigger blast and promote.

Multiple-airfoil type blade microminiature centrifugal fan of the present utility model is with special construction design, optimum efficiency and path in the time of can reaching heat radiation.

Centrifugal fan volume of the present utility model is frivolous, noise is little, can reduce the installing space, to improve utilization rate.

For enabling to the purpose of this utility model, structure or device characteristic and effect thereof, make further understanding and understanding, be described in detail as follows for embodiment's conjunction with figs. now:

Fig. 1 is a stereoscopic schematic representation of the present utility model;

Fig. 2 is the utility model STRUCTURE DECOMPOSITION schematic representation;

Fig. 3 is the utility model assembled sectional view;

Fig. 4 is the schematic representation of the utility model sweepforward aerofoil profile blade;

Fig. 5 is the schematic representation of the utility model swept-back airfoil fan.

Figure number and name thereof are referred to as explanation:

1, aluminum soleplate 241 slotted eyes

11 fan air grooves, 242 jack-posts

12 air-out, 3 coil axess

13 double-screw bolts, 4 circuit boards

2, flabellum body 5 loam cakes

21 slim ring 51 intake grills

22 blades, 52 screws

23 supporting members, 53 screws

24 impellers

See also shown in 1 to 3, the utility model is a kind of " multiple-airfoil type blade microminiature centrifugal fan ", comprises an aluminum soleplate 1, a flabellum body 2, a coil axes 3, one circuit boards 4 and a loam cake 5; It ties up to the fan air groove 11 that aluminum soleplate 1 is provided with a helical, and forms an exhaust outlet 12, and a flabellum body 2 is located thereon in this fan air groove 11, and is provided with a plurality of double-screw bolts 13 in the outer rim of this fan air groove 11, to be integral with a loam cake 5 interlockings.

Flabellum body 2 is provided with a slim ring 21, this thin type ring 21 is provided with a plurality of wing formula blades 22, the number of this blade 22 is regardless of, its Inlet cone angle and exit angle can change with the design environment demand, and can be designed to sweepforward aerofoil profile (as Fig. 4) or swept-back aerofoil profile (as Fig. 5), this slim ring 21 can be linked to the one or both sides of blade 22, and this slim ring 21 (is advisable with three to five with many supporting members 23, also can adjust with situation) be linked to a round impeller 24, each supporting member 23 can be designed to the prolongation of blade 22, possess partly aerofoil profile, make the flow field still keep smooth-going, this impeller 24 is provided with a slotted eye 241, and convexes with a jack-post 242 on the center portion of this impeller 24, so that a coil axes 3 and a circuit board 4 can be positioned in this slotted eye 241 in regular turn, and connect to one with this flabellum body 2.

Loam cake 5 which is provided with multiple intake grill 51, and the periphery of this intake grill 51 is provided with a plurality of screws 52, is passed in the double-screw bolt 13 that screw 52 is locked on base plate 1 to make each screw 53, and this loam cake 5 can be integral with base plate 1 interlocking.

Above-mentioned particular design makes to the utlity model has following advantage:

1, can form multiple air intake space, increase computer (PC) cooling fan radiating effect.

2, multiple wing type design diminishes blade, assigns in the space that can be littler.

3, the pressure decreased of base plate easily is inhaled into air-flow, promotes throughput and is easier to.

4, multiple wing type design, the airload of distribution blade is among a plurality of blades.

5, can actually reach centrifugal fan blade shape and function.

6, the flow field is more smooth and easy, reduces strength of vortex and noise.

7, under fixing less fan dimension, reach bigger blast and promote.

8, blade is many, runner water conservancy diversion effect is clear and definite, by adjusting fan blade turnover bicker, changes blast and flow effect and reach easily, is applied in the different design environments.

Claims

1, a kind of multiple-airfoil type blade centrifugal fan is characterized in that:

One base plate (1) which is provided with the fan air groove (11) of a helical, and forms an exhaust outlet (12);

One flabellum body (2), be positioned above-mentioned fan air groove (11), which is provided with a slim ring (21), this slim ring (21) is provided with a plurality of wing formula blades (22), this slim ring (21) can be linked to the one or both sides of blade (22), and this slim ring is linked to an impeller (24) with many supporting members (23), this impeller is provided with a slotted eye (241), and convex with a jack-post (242) on this impeller (24), so that a coil axes (3) and a circuit board (4) are positioned in this slotted eye (241) in regular turn; And

One loam cake (5), interlocking which is provided with multiple intake grill (51) on base plate (1).

2, multiple-airfoil type blade centrifugal fan as claimed in claim 1, it is characterized in that: the pattern of blade is the swept-back aerofoil profile.

3, multiple-airfoil type blade centrifugal fan as claimed in claim 1, it is characterized in that: the pattern of blade is the sweepforward aerofoil profile.

4, multiple-airfoil type blade centrifugal fan as claimed in claim 1 is characterized in that: supporting member (23) is three to five.

5, multiple-airfoil type blade centrifugal fan as claimed in claim 1, it is characterized in that: each supporting member (23) is designed to the prolongation of blade.