CN201228661Y

CN201228661Y - Blower fan

Info

Publication number: CN201228661Y
Application number: CNU2008200227706U
Authority: CN
Inventors: 郭志东
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-23
Filing date: 2008-05-23
Publication date: 2009-04-29
Anticipated expiration: 2018-05-23

Abstract

The utility model provides a fan comprising a spiral casing and an impeller assembly, wherein the spiral casing is equipped with an air inlet and an air outlet, and the impeller assembly comprises a rotary shaft penetrating through the spiral casing and a plurality of vanes rotating along with the rotary shaft. The fan is characterized in that the cross sections of the vanes perpendicular to the rotary shaft present circular arc shapes, the vanes surrounds the rotary shaft, two ends of the rotary shaft are fixedly connected in cylindrical form via circular girdles, the distance between the outer edge of the circular girdles and the inner wall of the spiral casing ranges from 1mm to 10 mm, a supporting disc uniformly distributed with holes is fixedly sleeved on the rotary shaft via a conical flange and is fixedly jointed with the middle portions of each vane, corresponding to each vane, the tangent line of the supporting disc at each vane and the junction joint of the outer edge of the supporting disc and the tangent line of the vane at the junction point of the outer edge of the supporting disc together form an included angle ranging from 136 degrees to 165 degrees, the tangent line of the supporting disc at the vane and the junction point of the inner edge of the supporting disc and the tangent line of the vane at the junction point of the inner edge of the supporting disc together form an included angle ranging from 60 degrees to 80 degrees with. Due to the special structure of the impeller assembly, the fan has the advantages of high and uniform air speed at the air outlet, large flow, small noise and the like.

Description

Blower fan

Technical field

The utility model provides a kind of blower fan, is used for cleaner-grader tool technical field.

Background technique

Existing blower fan is mainly by the spiral case and the impeller assembly of intake grill, exhaust outlet, wherein the impeller assembly is by forming with flange plate, rotating shaft and a plurality of straight blade of side plate binding, a plurality of straight blades are fixedly connected on fan shaft by certain spacing, and the effect of flange plate is fixedly to be that impeller assembly and spiral case are linked.Its working procedure, blower fan is under motor driving, the drives impeller assembly rotates in spiral case, gas is sucked by the two ends of impeller assembly, force the gas rotation by blade, gas is done work, its energy is increased, gas throws away around rotating shaft under action of centrifugal force, can convert speed to the pressure energy by spiral case, after the gas in the impeller assembly is discharged, its pressure is lower than the intake grill internal pressure, and new gas is the intake impeller assembly under action of pressure, and gas is just constantly discharged in blower fan continuously.The subject matter that exists is: the wind speed of exhaust outlet is little and inhomogeneous, and when axial dimension greatly the time (axial dimension greater than 1m time), the wind speed uniformity is poor more especially, when rotating speed increased, the wind speed of outlet can not increase yet, and flow is little, noise is big, and efficient is low, and its service behaviour needs further improvement.

The model utility content

The purpose of this utility model provide a kind of wind speed that can overcome above-mentioned defective, exhaust outlet big and evenly, flow is big, noise is little, the blower fan of excellent working performance.Its technological scheme is:

Described blower fan, comprise and be provided with intake grill, the spiral case of exhaust outlet and impeller assembly, wherein the impeller assembly comprises that bearing runs through rotating shaft that is installed on the spiral case and a plurality of blades that together rotate with rotating shaft, it is characterized in that: blade is circular-arc perpendicular to the cross section of rotating shaft, a plurality of blade rings around the shaft, its two ends are fixedly connected by circular endless belt and are tubular, 1～the 10mm apart of the outer rim of circular endless belt and spiral case inwall, uniform porose supporting disk is fixed in the rotating shaft through the cone-shaped flange suit, and be fixedly connected with the middle part of each blade, corresponding to each blade, the angle that tangent line and this blade the tangent line at above-mentioned interface place of supporting disk at the interface place of this blade and supporting disk outer rim is 135～165 degree, the angle that tangent line and this blade the tangent line at above-mentioned interface place of supporting disk at the interface place of this blade and supporting disk inner edge is 60～80 degree.

Described blower fan, the arc length scope 65mm～100mm of each blade, chord length scope 50mm～95mm.

Described blower fan, the hole on the supporting disk are distributed on two different circumference of diameter around the shaft.

Its working principle is: motor rotates through rotating shaft impeller assembly, gas enters impeller assembly inside from the impeller assembly two ends of tubular, because the angle of a plurality of blades is arranged, impeller assembly when rotation air-flow portion within it forms eccentric vortex, make the inside and outside generation pressure difference of spiral case, air-flow is discharged from exhaust outlet.

The utility model compared with prior art has following advantage:

1, owing to the special construction of impeller assembly, a plurality of angled arc shaped blade twisted rotary shafts, its two ends are fixedly connected by circular endless belt and are tubular, and have increased the sectional area of air inlet, and the air inlet flow is added;

2, because the gap of the outer rim of circular endless belt and spiral case inwall is little, reduced eddy current loss, the fan efficiency height;

3, because the special angle of blade, and the neutral position of blade is by uniform porose supporting disk support fixation, make that impeller assembly rotating speed is steady, and the impeller assembly is under same rotating speed, the wind speed and the flow of exhaust outlet all increase, and so just guarantee that the utility model just can reach higher wind speed and flow down at lower rotating speed (as being lower than 800r/min), and then have reduced noise, be lower than 800r/min as rotating speed, noise is no more than 70 decibels;

4, since the neutral position of blade by uniform porose supporting disk support fixation, air-flow is distribution uniform vertically, and then guarantees that the wind speed of fan outlet is even.

Description of drawings

Fig. 1 is the utility model embodiment's a structural representation;

Fig. 2 is an A-A sectional view embodiment illustrated in fig. 1.

Among the figure: 1, spiral case 2, blade 3, supporting disk 4, hole 5, cone-shaped flange 6, rotating shaft 7, circular endless belt 8, intake grill 9, key 10, exhaust outlet

Embodiment

In the embodiment shown in Fig. 1-2: comprise being provided with intake grill 8, the spiral case 1 of exhaust outlet 10 and impeller assembly, wherein the impeller assembly comprises that bearing runs through rotating shaft 6 that is installed on the spiral case 1 and a plurality of blades 2 that together rotate with rotating shaft 6, the arc length 65mm of each blade 2, chord length 75mm, its cross section perpendicular to rotating shaft 6 is circular-arc, a plurality of blade 2 twisted rotary shafts 6, its two ends are fixedly connected by circular endless belt 7 and are tubular, the outer rim of circular endless belt 7 and spiral case 1 inwall are at a distance of 2mm, supporting disk 3 is fixed in the rotating shaft 6 through cone-shaped flange 5 suits, and be fixedly connected with the medium position of each blade 2, blade 2 is played the effect of support fixation, supporting disk 3 is provided with a plurality of holes 4, a plurality of holes 4 are distributed on the different circumference of two diameters of twisted rotary shaft 2, at each blade 2, the angles that tangent line and this blade 2 the tangent line at above-mentioned interface place of supporting disk 3 at the interface place of this blade 2 and supporting disk 3 outer rims is 155 degree, the angles that tangent line and this blade 2 the tangent line at above-mentioned interface place of supporting disk 3 at the interface place of this blade 2 and supporting disk 3 inner edges is 75 degree.

Claims

1, a kind of blower fan, comprise and be provided with intake grill (8), the spiral case (1) and the impeller assembly of exhaust outlet (10), wherein the impeller assembly comprises that bearing runs through rotating shaft (6) that is installed on the spiral case (1) and a plurality of blades (2) that together rotate with rotating shaft (6), it is characterized in that: blade (2) is circular-arc perpendicular to the cross section of rotating shaft (6), a plurality of blades (2) twisted rotary shafts (6), its two ends are fixedly connected by circular endless belt (7) and are tubular, 1～the 10mm apart of the outer rim of circular endless belt (7) and spiral case (1) inwall, the supporting disk of uniform porose (4) (3) is fixed in the rotating shaft (6) through cone-shaped flange (5) suit, and be fixedly connected with the middle part of each blade (2), corresponding to each blade (2), the angles that tangent line and this blade (2) the tangent line at above-mentioned interface place of supporting disk (3) at the interface place of this blade (2) and supporting disk (3) outer rim is 135～165 degree, the angles that tangent line and this blade (2) the tangent line at above-mentioned interface place of supporting disk (3) at the interface place of this blade (2) and supporting disk (3) inner edge is 60～80 degree.

2, blower fan as claimed in claim 1 is characterized in that: the arc length scope 65mm～100mm of each blade (2), chord length scope 50mm～95mm.

3, blower fan as claimed in claim 1 is characterized in that: the hole (4) on the supporting disk (3) is distributed on around the shaft on two different circumference of (6) diameter.