CN1297752C

CN1297752C - Vortex fan

Info

Publication number: CN1297752C
Application number: CNB021286787A
Authority: CN
Inventors: 杉尾孝; 泉善树
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2001-08-20
Filing date: 2002-08-12
Publication date: 2007-01-31
Anticipated expiration: 2022-08-12
Also published as: JP2003056485A; CN100430608C; CN1955488A; JP3843781B2; KR20030016175A; CN100445567C; CN1955487A; CN1407244A

Abstract

The invention relates to a low noise, large air volume vortex flow fan which adopts the following scheme: the fan includes a columnar shell having an air inlet port and an air outlet port; a disciform impeller, arranged in the shell, provided with plural blades on both sides of peripheral; a wind shield section arranged in the gap of the shell between the inlet port and the outlet port and the impeller. When the outside diameter of the impeller is D1, the inside diameter of the shell is D2, the height of the blades is b1, then they have the relation as following: 0.70 < = b1 / ((D2 - D1) / 2+b1)) < = 0.85.

Description

Vortex flow fan

Technical field

The present invention relates to the microminiature vortex flow fan of impeller outer diameter below 100mm, particularly the vortex flow fan of low noise, big air quantity.

Background technique

Vortex flow fan can just change, the switching of counter-rotating, such as, the fan as ventilation usefulness is used to the air feed of outdoor air and the exhaust of indoor air etc.

As existing this vortex flow fan, for example in Japanese kokai publication sho 54-47114 document structure shown in Figure 7 is disclosed.

Fig. 7 A represents front section view, and Fig. 7 B represents along the sectional view of the A-A line among Fig. 7 A.In the figure, this fan comprises the shell 102 with the entry end 101 that makes air 100 inflows; Impeller 104, this impeller 104 has a plurality of blades 103, and it transmits leaked-in air 100 by the direction rotation along arrow a, and its pressure is risen; The outlet end 105 that the air 100 that pressure is risen is discharged from shell 102.The stream 106 in 101 the shell 102, be provided with windshied part 107 from outlet end 105 to entry end along the sense of rotation of impeller 104, it is with 106 sealings of the stream beyond the blade 103.In addition, impeller 104 is installed on the running shaft 109, and this running shaft 109 is connected with the motor 108 that is arranged at the outside.

In the vortex flow fan that forms like this, from the pressure of entry end 101 leaked-in airs 100 the stream 106 along shell 102 inside flow during, under the effect of impeller 104, rise at leisure with a plurality of blades 103, discharge from outlet end 105.In addition, the stream 106 between entry end 101 and outlet end 102 is sentenced windshied part 107 that predetermined angular θ is provided with as shown in Fig. 7 B, almost the stream beyond 104 rotary areas of impeller of the stream 106 in the shell 102 is sealed.Because such effect, this vortex flow fan obtains to be higher than the pressure of general centrifugal cutter far away.

In addition, at TOHKEMY 2000-146219 document, TOHKEMY 2000-193269 document, in the TOHKEMY 2000-249365 document, disclose following example, wherein, utilize vortex flow fan only to have by making the sense of rotation counter-rotating, make the characteristic that flows to the direction counter-rotating, with the ventilation fan of this fan as air conditioner.

This require the operating principle of vortex flow fan with as general vortex flow fan, regenerative pump, eddy current blower and known fluid machinery is identical with lower pressure, is realized bigger air quantity, and realizes turning round with low noise.

But, in above-mentioned existing example, the shape of unexposed suitable low-pressure, low noise, big air quantity, it is little that particularly small-sized vortex flow fan has an air quantity, but the problem of the big grade of noise.

Summary of the invention

The objective of the invention is to solve the problem of vortex flow fan in the past, provide high performance, the vortex flow fan of low noise.

In order to solve existing problem, vortex flow fan of the present invention adopts following proposal, and this fan comprises the entry end with air and the cylindrical shell of outlet end; Be arranged at the inside of above-mentioned shell, have the discoid impeller of a plurality of blades in the peripheral part both sides; Be arranged at the windshied part in the gap of shell between above-mentioned entry end and the outlet end and above-mentioned impeller, when the external diameter of above-mentioned discoid impeller is D1, the inside diameter D 2 of above-mentioned shell, during above-mentioned blades height b1, then has the relation of 0.70≤b1/ ((D2-D1)/2+b1))≤0.85 and D1≤100mm.

According to above-mentioned scheme, the height of stream (D2-D1)/2+b1 relatively, get enough big blade height, thus, blade promotes disorderly flowing, and obtain enough amount of boost, and inhibition is passed windshied part with blade, turn back to the distolateral air quantity of inlet, the air quantity of the number of revolution of relative eddy fan is increased.

Description of drawings

Figure 1A is the partial sectional view in front of the vortex flow fan of the 1st mode of execution of the present invention.

Figure 1B is the sectional view along the A-A line among Figure 1A.

Fig. 1 C is the amplification view along the B-B line among Figure 1B.

Fig. 2 is in the vortex flow fan of expression the 1st mode of execution of the present invention, relatively the performance plot of the air quantity performance of the ratio of stream height and blade height.

Fig. 3 is in the vortex flow fan of expression the 1st mode of execution of the present invention, relatively the performance plot of impeller outer diameter and the air quantity performance of the ratio of root of blade diameter.

Fig. 4 is in the vortex flow fan of expression the 1st mode of execution of the present invention, the performance plot of the flow path width of opposite shell and the air quantity performance of the ratio of the width of blade.

Fig. 5 A is the partial sectional view in front of the vortex flow fan of the 2nd mode of execution of the present invention.

Fig. 5 B is the sectional view along the A-A line among Fig. 5 A.

Fig. 6 A is the partial sectional view in front of the vortex flow fan of the 3rd mode of execution of the present invention.

Fig. 6 B is the sectional view along the A-A line of Fig. 6 A.

Fig. 7 A is the fragmentary sectional elevation view of the vortex flow fan of existing example.

Fig. 7 B is the sectional view along the A-A line among Fig. 7 A.

Embodiment

With reference to the accompanying drawings, embodiments of the present invention are described.

(the 1st mode of execution)

Figure 1A represents the partial sectional view in front of the vortex flow fan of the 1st mode of execution of the present invention, and Figure 1B represents that along the sectional view of the A-A line among Figure 1A, Fig. 1 C represents along the amplification view of the B-B line among Figure 1B.

In the accompanying drawings, impeller 1 is formed by portion 3 between a plurality of blades 2 and leaf.At impeller 1 with take between the shell 4 of this impeller, be provided with stream 5, in addition, on shell 4, the spacing with regulation is provided with entry end 6 and outlet end 7.Also have, be provided with windshied part 8,, make leakage of air reach irreducible minimum so that the stream 5 of entry end 6 and outlet end 7 is isolated.As shown in Figure 1B, the inner face 9 of this windshied part 7 keeps as far as possible little gap with the outside of impeller 1 10.In addition, the face against entry end 6 and outlet end 7 in this windshied part 8 forms the part of the wall of entry end 6 and outlet end 7 respectively.Also have, impeller 1 is connected with the running shaft 13 of motor 12 by bearing portion 11, and the rotation by motor 12 is along the arrow b direction of Figure 1A, or its opposite spin.

Generally, as following, describe in vortex flow fan, realizing the principle of boosting.That is, follow, in stream 5,, increase gradually, boost and transmission effect enhancing by the outer circumference end of impeller 1 and the poor disorder of flowing that produces of the moment of momentum in interior week because of the rotation of impeller 1 is advanced along the direction of arrow c from entry end 6 leaked-in airs 14.Meanwhile,, be discharged to stream 5 inside, produce once more and turn back to flowing of root of blade the air 14 of one 3 between the leaf of impeller 1 front end from blade 2.

Because such effect is side by side carried out by a plurality of blades 2,, further promote disorderly mobile so in stream 5, Air mixing and impact are fierce.Consequently, in the pressure that little by little improves air, send it to outlet end 7.Therefore, in order to increase amount of boost, promote disorderly flowing, it is believed that the area of contact that increases between impeller 1 and the air 14, the mode that strengthens blade 2 is effective.

Stream 5, advance according to maximum and impeller 1 identical speed from entry end 6 leaked-in airs 14, discharge from outlet end 7, but this moment, and the air of the cubical content between the leaf of impeller 1 in the one 3 is followed the rotation of impeller 1, pass from windshied part 8, turn back to entry end 6 one sides.Therefore, the volume of impeller 1 inside is more little, and the air quantity that turns back to entry end 6 one sides is few more, and the outlet air quantity of the rotation quantity of relative eddy fan increases.

Therefore, in vortex flow fan, flow in order to promote the disorder that should increase amount of boost, increase the area of contact between impeller 1 and the air, the mode that strengthens blade 2 is effectively, if make the internal diameter of the external diameter of impeller 1 greater than shell 4, then can increase the size of blade 2, increase amount of boost.

In addition, the volume of impeller 1 inside is more little, and the air quantity that turns back to entry end 6 one sides is few more, and consequently, the outlet air quantity of the number of revolution in the relative eddy fan increases.Therefore, if make the internal diameter of the external diameter of impeller 1 less than shell 4, then reduce the volume of the inside of impeller 2, the outlet air quantity of number of revolution increases relatively.

As shown in Figure 1B, D1 represents the external diameter of impeller 1, and D2 represents the internal diameter of shell 4, and b1 represents the height of blade 2, and b2 represents the width of impeller 1, and a1 represents from the outside of impeller 1 to the gap of the inner side surface of shell 4.

At this moment, b1/ ((D2-D1)/2+b1)), that is, the stream height provides at Fig. 2 with the air quantity performance of the ratio of blade height relatively.As shown in this figure,

0.70 in the scope of≤b1/ ((D2-D1)/2+b1))≤0.85, air quantity presents maximum basically.

In addition, 0.70＞((D2-D1)/2+b1)) time, the height of stream 5 relatively, the height of the blade 2 of impeller 1 is too small, can not expect to promote fully disorderly flowing.((D2-D1)/2+b1))＞0.85 o'clock, it is believed that the volume of the inside of impeller 1 is excessive, the air quantity that turns back to entry end 6 one sides becomes many, and consequently, the air quantity of the number of revolution of relative eddy fan reduces.

In addition, the result the when result of Fig. 2 is 68mm for impeller outer diameter D1 confirms that this result sets up in the scope of impeller outer diameter D1 below 100mm.

(D1-2 * b1)/D1, that is, impeller outer diameter provides at Fig. 3 with the air quantity performance of the ratio of root of blade diameter relatively.According to Fig. 3,

0.40 under the condition of≤(D1-2 * b1))/D1≤0.50, air quantity presents maximum basically.In addition, it is believed that, in (D1-2 * b1))/D1＞0.50 o'clock, compare with impeller outer diameter, profile ID is excessive, and blade diminishes, and can't expect to promote fully disorderly flowing, the stream height itself also diminishes, 0.40＞and during (D1-2 * b1))/D1, impeller inner and outer diameter difference is excessive, and the excessive loss that causes of impeller inner and outer diameter difference increases, consequently, the air quantity of the relative number of revolution in the vortex flow fan reduces.

B2/ (b2+2 * a1)), that is, the flow path width of opposite shell is shown in Figure 4 with the air quantity performance of the ratio of the width of blade.According to Fig. 4,

0.25 (in the scope of b2+2 * a1)≤0.50, air quantity presents maximum to≤b2/ basically.At 0.25＞b2/ (during b2+2 * a1), compare with the enclosure width, the impeller width is too small, can not expect to promote fully disorderly flowing, b2/ (b2+2 * a1)＞0.50 o'clock, the volume of impeller inside is excessive, the air quantity that turns back to inlet side becomes big, consequently, the air quantity of the relative number of revolution in the vortex flow fan reduces.

Below windshied part 8 is described.Windshied part 8 as shown in Figure 1, is tunnel-like in the present embodiment basically.With impeller 1 rotation, entrance part 15 places at windshied part 8 are divided into the air stream towards outlet end 7 from entry end 6 leaked-in airs 14, and with impeller 1, by the opening in the windshied part 8, and discharge, with the air stream that mixes from entry end 6 leaked-in airs stream from export department 16.

As shown in Fig. 1 C of the sectional view of the B-B line among Figure 1B, two sides in the bight 17 of the entrance part 15 of windshied part 7 are provided with chamfered section 18.When the blade 2 in impeller 1 enters into windshied part 8, ambient air is sharply compressed, the spacing of this compression and blade 2 synchronously changes, and thus, produces nZ sound or its high frequency waves that its frequency is shown by each numerical table of number of revolution * blade.According to present embodiment, because the effect of this chamfered section 18 is not sharply compressed ambient air, thus, the nZ sound can reduce.In addition, according to present embodiment, also, chamfered section 18 is set at export department 16 places of windshied part 8.Therefore, even under the situation that the blade 2 in impeller 1 withdraws from from windshied part 8, the pressure of ambient air and the spacing of blade synchronously change, and produce nZ sound or its high frequency waves that its frequency is represented by number of revolution * number of blade, but owing to the effect of above-mentioned chamfered section 18 weakens.

In the present embodiment, chamfered section is the R chamfering, in this case, and the resistance force diminishes of air stream, but obviously,, still have effect even be C shape chamfering.

In addition, in the present embodiment, as shown in Fig. 1 C, the mounting point of the blade 2 on the two sides of impeller 1 half pitch that staggers by the phase mutual interference of the nZ sound that produces on the two sides, is slowed down the nZ sound like this.

(the 2nd mode of execution)

Fig. 5 A, Fig. 5 B represent the 2nd mode of execution of the present invention, in the structure of present embodiment, and the explanation of the part that omission and the 1st mode of execution are common.That is, lip part 20 cylindraceous is stretched out towards the side face 19 of shell 4 from the interior perimembranous of impeller 1.Thus, the area of contact between impeller 1 and the air 14 increases, and so just promotes disorderly flowing, and amount of boost is increased.Because the volume of impeller 1 increases in fact hardly, so with impeller 1, pass windshied part 8, it is very little returning that performance that the air quantity increase of entry end 6 one sides causes reduces, and says the increase of acquisition air quantity on the whole.

In addition, owing to the rotor part 22 in the external-rotor motor of the rotation on every side that makes the stator 21 of rotor part 22 on being fixed in shell 4, and the lip part cylindraceous 20 that stretches out towards the side face 19 of shell 4 from the interior perimembranous of impeller 1 is integrally formed, so the hub portion 23 of such impeller that Fig. 1 is seen is unwanted with the dual structure of the inner circle wall 24 of the stream 5 of shell 4, can increase flow path area, thus, can increase the air quantity of unit number of revolution.

(the 3rd mode of execution)

Fig. 6 A, Fig. 6 B represent the 3rd mode of execution of the present invention.In the structure of present embodiment, the explanation of the part that omission and the 1st mode of execution are common.As shown in the figure, make flange 26 from middle periphery inner face 25 in the form of annular discs the stretching out of the peripheral part of impeller 1 towards shell 4.Thus, area of contact between impeller 1 and the air increases, promote disorderly flowing like this, amount of boost is increased, on the other hand, because the volume of impeller 1 increases in fact hardly, so with impeller 1, pass windshied part 8, return the performance that the air quantity increase of entry end 6 one sides causes and reduce very little, say that on the whole obtaining air quantity increases.In addition, the invention is not restricted to the structure of above-mentioned mode of execution, obviously, the present invention can suitably carry out design alteration in the scope that does not break away from essence of an invention.

As above-mentioned, in vortex flow fan of the present invention, owing to can obtain enough amount of boost, and pass windshied part with impeller, return the distolateral air quantity of inlet and be suppressed, the air quantity of the relative number of revolution in the vortex flow fan is increased, can reduce the nZ sound, so can provide low noise, the vortex flow fan of big air quantity.

Claims

1. vortex flow fan, this vortex flow fan comprises: the shell with column of the entry end of air and outlet end; Be arranged at the inside of above-mentioned shell, have the discoid impeller of a plurality of blades in the peripheral part both sides; Be arranged at the windshied part in the gap of described shell between above-mentioned entry end and the outlet end and above-mentioned impeller, it is characterized in that:

When the external diameter of above-mentioned discoid impeller is D1, the internal diameter of above-mentioned shell is D2, when above-mentioned blades height is b1, and then 0.70≤b1/ ((D2-D1)/2+b1))≤0.85, and D1≤100mm.

2. vortex flow fan according to claim 1 is characterized in that, 0.40≤(D1-2 * b1))/D1≤0.50.

3. vortex flow fan according to claim 2 is characterized in that, when the width of impeller is b2, and when the gap between impeller and the shell inner side surface is a1,0.25≤b2/ (b2+2 * a1)≤0.50 then.