CN101749288B - Airflow generating method and device - Google Patents

Abstract

The invention discloses an airflow generating method which comprises the following steps: an airflow generating unit and a nozzle are provided, wherein the nozzle is provided with an inner passage and a vent port, and the inner passage is communicated with the interior of the airflow generating unit; the airflow provided by the airflow generating unit is introduced into the inner passage, and the gage pressure of the airflow in the inner passage is 50-5000 Pa; the airflow in the inner passage is discharged from the vent port, and the discharged air does not produce the Coanda effect on the nozzle and entrains the air around the vent port, thereby amplifying the airflow. The invention also discloses an airflow generating device by using the method. The invention has the advantages of easy cleaning, high safety, high efficiency, small size, no effect on light rays, low noise and the like, and can be widely used in various fan units.

Description

A kind of airflow generating method and device

Technical field

The present invention relates to gas flow, particularly a kind of method and device of air-flow generation.

Background technique

Fan has obtained using widely owing to have advantages such as energy-conservation, that cost is low.At present, existing polytype fan is selective on the market, as ceiling fan, stand fan, rotary blade fan, air conditioning fan etc., has also occurred possessing the fan of deodorization and sterilization, anion fine-purification function in recent years.

The building block of existing electric fan is: have the drive unit of rotatingshaft, as exchanging or direct current generator, various difform blades or the wing are installed on the described rotatingshaft, adjust the arrangements for speed regulation that drive unit rotates mean velocity.And in fans such as the stand fan except ceiling fan, rotary blade fan, safety cover has been installed also all, prevent that people, animal or object from touching rotating blades or the wing and meet accident.In order to satisfy user's requirement, can change the power of drive unit, the length of blade and the setting angle on rotatingshaft, thereby obtain to meet wind speed, the air quantity of usage requirement.

Said fans also comes with some shortcomings, as:

1, inconvenience is cleaned.

For the ceiling fan that is hung in the roof, the dust of being infected with on the blade need be climbed and could be cleaned, and is very inconvenient.For stand fan, rotary blade fan, desk fan, especially blade on be infected with dust clean protective housing need be pulled down very inconvenient.

2, poor stability.

Although protective housing is arranged, child still can be inserted into finger in the fan blade, and is injured easily.

3, volume is big, has reduced user's working space.

The diameter of ceiling fan blade is much in 1m.The length of desk fan base all surpasses 30cm, has taken more desktop, has influenced putting of other article, as computer, file etc.

4, state in the use in the fan process, the blade of rotation or the wing have stopped passing of natural light or illumination, and long-term the use can constitute influence to user's eyesight.

5, the rotation of blade or wing promotion air flows towards the user, thereby makes the user feel nice and cool.The generation of air-flow mainly is that the air of fan neighboring area also can involve in this air-flow by the rotation of blade or the wing, but this effect is very little, can ignore.

6, noise is big.Blade or the wing are in rotary course and air friction and send bigger noise, and rotating speed is more high, and noise is more big, has disturbed user's work and life.

Summary of the invention

In order to overcome deficiency of the prior art, the invention provides does not a kind ofly have influence, safe, high working efficiency, airflow generating method that noise is little to light, also provide a kind of easy to clean, safe, take volume little, light is not had influence, high working efficiency, air flow-producing device that operating noise is little.

For achieving the above object, the present invention is by the following technical solutions:

A kind of airflow generating method, characteristics are:

Air-flow generation unit, nozzle are provided, and described nozzle has inner passage, relief opening, the internal communication of described inner passage and described air-flow generation unit;

The air-flow that the air-flow generation unit provides feeds described inner passage, and the gauge pressure of air-flow is in [50Pa, 5000Pa] in the inner passage;

Air-flow in the inner passage is discharged from relief opening, and the gas of discharge does not produce Coanda effect on nozzle, and the gas of discharging from relief opening has entrainmented the gas of relief opening periphery, and the flow that entrainments gas is that relief opening is discharged more than 2 times of gas flow.

As preferably, the distance that is used to form the apparent surface of relief opening is 0.2-10mm.

As preferably, the distance that is used to form the apparent surface of relief opening is 0.8-3mm.

As preferably, the gauge pressure of air-flow is 200-700Pa in the inner passage.

As preferably, the gauge pressure of air-flow is 200-500Pa in the inner passage.

As preferably, described nozzle is annular.

As preferably, at least one end of described nozzle seals.

As preferably, described air-flow provides the unit to comprise motor, on the rotatingshaft of motor impeller is installed; Motor and impeller are installed in the housing, and housing is provided with suction port.

In order to realize said method, the invention allows for a kind of like this air flow-producing device, characteristics are: described air flow-producing device comprises,

The air-flow generation unit;

Nozzle, described nozzle has inner passage, relief opening, the internal communication of described inner passage and described air-flow generation unit; The relation of the air quantity Q that the area A of relief opening and described device produce is:

$\frac{Q}{2700}<A<\frac{Q}{27};$

The air-flow that the air-flow generation unit provides feeds described inner passage, discharges from relief opening afterwards; The gas of discharging from relief opening does not produce Coanda effect on nozzle.

As preferably, the relation of the air quantity Q that the area A of relief opening and described device produce is:

$\frac{Q}{1015}<A<\frac{Q}{54}.$

As preferably, the relation of the air quantity Q that the area A of relief opening and described device produce is:

$\frac{Q}{858}<A<\frac{Q}{54}$。

As preferably, the distance that is used to form the apparent surface of relief opening is 0.2-10mm.

As preferably, the distance that is used to form the apparent surface of relief opening is 0.8-3mm.

As preferably, described nozzle is annular.

As preferably, described relief opening is arranged on a side of nozzle.

As preferably, at least one end of described nozzle seals.

As preferably, described air-flow provides the unit to comprise motor, on the rotatingshaft of motor impeller is installed; Motor and impeller are installed in the housing, and housing is provided with suction port.

Compared with prior art, the present invention has following beneficial effect:

1, the present invention no longer externally arranges blade, only need washer jet to get final product, and the cleaning of nozzle is very convenient.

2, Security is good.

The relief opening size of nozzle is smaller, even finger is inserted in the relief opening also can not meet accident.

3, volume is little, has reduced the occupation area of fan on desk.

4, light is not stopped.The blade of rotation no longer is set on nozzle, and light can pass freely through nozzle.

5, noise is low.Blade no longer is set, has avoided rotation blade and gas friction and noise takes place.

6, the amplification of air-flow.The gas of discharging from relief opening is direct discharge nozzle, and the air-flow of discharging gas formation has entrainmented the gas of relief opening and even nozzle periphery, thereby has realized the amplification of air-flow, and magnification factor surpasses 3.

Have, the gas of discharging from relief opening is direct discharge nozzle again, and the gas of namely discharging can not produce Coanda effect on nozzle yet.

Description of drawings

Fig. 1 is the front view of fan assembly of the present invention;

Fig. 2 is the partial schematic diagram of fan assembly among Fig. 1;

Fig. 3 be among Fig. 1 fan assembly along the partial schematic diagram of A-A line direction;

Fig. 4 is the detailed local enlarged diagram of fan assembly among Fig. 1;

Trace schematic representation when Fig. 5 is 500Pa for stream pressure in the inner passage of emulation;

Fig. 6 is the flow velocity schematic representation when stream pressure is 500Pa in the inner passage of emulation;

Fig. 7 is the front view of the another fan assembly of the present invention;

Fig. 8 be among Fig. 7 fan assembly along the partial schematic diagram of A-A line direction.

Embodiment

Following examples have been done further instruction to situations such as structure of the present invention, function and applications, are several reasonable application forms of the present invention, but scope of the present invention is not confined to following embodiment.

Embodiment 1:

As shown in Figure 1, a kind of device that produces air-flow is applied in the fan, and described device comprises air-flow generation unit 2,nozzle 1.

Shown in Fig. 1,3, described air-flow generation unit 2 comprises outer cover, motor and impeller, diffuser, andsuction port 21 is set on the described outer cover.Described motor adopts direct current generator, and impeller is installed on the rotatingshaft of motor.Diffuser is positioned at the downstream of impeller, and diffuser comprises the fixedly static disc with helical blade.

The import of leading to impeller communicates with described suction port 21.Hollow channel or pipeline in the outlet of diffuser and the relief opening of impeller and the outer cover communicate, to produce the air-flow of the inner passage from the impeller to the nozzle.Motor is controlled by controller, and the cooperation of controller and a plurality of selection buttons makes the user control fan.

Shown in Fig. 1-4, describednozzle 1 is installed on the air-flow generation unit, is annular, and this ring nozzle limits central opening.Described nozzle comprisesinner passage 15,relief opening 10, andrelief opening 10 is arranged on a side ofnozzle 1, makes the gas of discharging fromrelief opening 10 can not produce Coanda effect on nozzle 1.Describedinner passage 15 is communicated with air-flow generation unit 2.

The relation of the air quantity Q that the area A of describedrelief opening 10 and described device produce is:$\frac{Q}{2700}<A<\frac{Q}{27},$Described air quantity Q is for being three times in the flow at orifice size place apart from nozzle.

Nozzle 1 is made of at least one wall that limitsinner passage 15 and relief opening 10.In the present embodiment, nozzle comprises wall, and wall is arranged to ring-type.One end of this wall definesrelief opening 10, is used to form theapparent surface 11 ofrelief opening 10,12 spacing is 0.2-10mm.

A kind of method that produces air-flow, characteristics are:

Provide the device of above-mentioned generation air-flow, shown in Fig. 1-4;

The user selects button according to actual needs, by this button to the motor mail message.By selecting, make motor under a state, work, extraneous gas is drawn in the generation unit by suction port, arrive the import of impeller, the air-flow that leaves from diffuser outlet and the exhaust of impeller are divided into two strands of air-flows, these two strands of air-flows pass the inner passage in the opposite direction, and the gauge pressure of gas is 50-5000Pa in the inner passage.Air-flow is directly discharged by relief opening, and the air-flow of discharging by relief opening is as main air flow, and main air flow can not form Coanda effect at nozzle.

The output of main air flow and be injected insuction port 21 places and produce the area of low pressure has the effect with additional gas suction generation device.Air-flow passes nozzle and flows outrelief opening 10, near the peripheral region ofrelief opening 10 and the outward edge of nozzle gas is entrainmented in the main air flow, the flow of the gas that is entrainmented is to discharge more than 2 times of gas flow fromrelief opening 10, thereby has realized the purpose that air-flow amplifies.

Embodiment 2:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 1:

1, described is circular on nozzle-integrated, and the diameter of annulus is 300mm;

2, the relation of the air quantity Q of the area A of described relief opening and described device generation is:$\frac{Q}{1015}<A<\frac{Q}{54},$The air quantity Q of described matching requirements is [0.3m³/ s, 1.1m³/ s], area A is selected 0.002m², the distance that is used to form between the apparent surface of relief opening is 2mm.

Said apparatus in use by regulating the gauge pressure size of air-flow in the inner passage, as from 200Pa to 1500Pa, makes the requirement that can satisfy air quantity Q.

A kind of method that is applied in the generation air-flow in the fan, as different from Example 1:

1, described is circular on nozzle-integrated, and the diameter of annulus is 300mm.

2, the distance that is used to form between the apparent surface of relief opening is 2mm, and the gauge pressure regulation range of air-flow is 50-5000Pa in the inner passage, and the air quantity Q of acquisition is 0.15-1.94m³/ s can satisfy user's requirement.The concrete parameter that records sees alsoform 1.

As shown in Figure 5, the air-flow that the black representative is directly discharged from relief opening, the air-flow that the grey representative is entrainmented.In the position of three times of orifice sizes of distance nozzle, air quantity Q is 0.56m³/ s is 10.56 times from the relief opening discharge flow rate.

As shown in Figure 6, the length of arrow represents the size of flow velocity, and the velocity ratio that air-flow is located in the position of three times of orifice sizes of distance nozzle (second figure is played on the right among Fig. 7) is more even, and mean velocity is 2.58m/s.The user feels it is comfortable under the effect of this mean velocity air-flow.

Form 1:

Pressure (Pa)	Air quantity Q (m3/s)	The magnification factor of air-flow	Be three times in the mean velocity (m/s) at orifice size place apart from nozzle
				50	0.15	9.20	0.95
200	0.35	10.35	1.71
				400	0.50	10.53	2.33
500	0.56	10.56	2.58
				700	0.67	10.58	3.02
900	0.76	10.58	3.43
				1500	0.98	10.56	4.27
3000	1.47	11.19	5.77
				5000	1.94	11.40	7.25

Byform 1 as seen, under the situation that relief opening on the nozzle remains unchanged, along with the increase of gas pressure in the inner passage, air quantity Q, flow velocity all become greatly, and the magnification factor of air-flow is also increasing lentamente.

Embodiment 3:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 2:

The relation of the air quantity Q that the area A of described relief opening and described device produce is:$\frac{Q}{857}<A<\frac{Q}{54},$The air quantity Q of described matching requirements isArea A is selected 0.0004m², the distance that is used to form between the apparent surface of relief opening is 0.4mm.

Said apparatus in use by regulating the gauge pressure size of air-flow in the inner passage, as from 300Pa to 2000Pa, makes the requirement that can satisfy air quantity Q.

A kind of method that is applied in the generation air-flow in the fan, as different from Example 2:

Keep the gauge pressure of gas in the inner passage constant, as be 300Pa, the distance that is used to form between the apparent surface of relief opening is adjusted to 2mm from 0.2mm, and the data that obtain see also form 2.

Form 2:

The size of relief opening (mm)	Air quantity Q (m3/s)	The magnification factor of air-flow	Be three times in the mean velocity (m/s) at orifice size place apart from nozzle
				0.2	0.09	22.35	0.68
0.4	0.16	19.75	0.95
				2	0.43	10.47	2.04

Byform 2 as seen, under the situation that gas pressure is constant in the inner passage, along with the change big (being exhaust port area) of relief opening on nozzle, air quantity Q, mean velocity all become greatly, and the magnification factor of air-flow is diminishing on the contrary.

Inform 2, stream pressure is 300Pa in the inner passage, and the air quantity that produces when relief opening is of a size of 0.2mm can not be satisfied the demand, but can pass through to strengthen the pressure of air-flow in the inner passage or increase exhaust port area A, thereby meets the demands.When arriving 1500Pa as pressure, air quantity Q is 0.28m³/ s.Concrete principle sees also the rule of summing up among theembodiment 2.

Embodiment 4:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

The requirement of air quantity Q is for being not less than 0.20m³/ s, the distance that is used to form between the apparent surface of relief opening is 0.8mm.

Said apparatus in use by regulating the gauge pressure size of air-flow in the inner passage, as from 200Pa to 2000Pa, makes the requirement that can satisfy air quantity Q.

A kind of method that is applied in the generation air-flow in the fan, as different from Example 2:

1, the requirement of air quantity Q is for being not less than 0.20m³/ s, the distance that is used to form between the apparent surface of relief opening is 0.8mm;

2, keep relief opening constant, increase the pressure of air-flow in the inner passage gradually, as increasing to 2000Pa from 200Pa, the partial data that records sees also form 3.

Form 3:

Pressure (Pa)	Air quantity Q (m3/s)	The magnification factor of air-flow	Be three times in the mean velocity (m/s) at orifice size place apart from nozzle
				200	0.20	15.31	1.10
500	0.34	16.31	1.67
				700	0.41	16.41	1.91

Embodiment 5:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

The requirement of air quantity Q is for being not less than 0.22m³/ s, the distance that is used to form between the apparent surface of relief opening is 1.0mm.

Said apparatus in use by regulating the gauge pressure size of air-flow in the inner passage, as from 200Pa to 2000Pa, makes the requirement that can satisfy air quantity Q.

A kind of method that is applied in the generation air-flow in the fan, as different from Example 2:

1, the requirement of air quantity Q is for being not less than 0.22m³/ s, the distance that is used to form between the apparent surface of relief opening is 1.0mm;

2, keep relief opening constant, increase the pressure of air-flow in the inner passage gradually, as increasing to 2000Pa from 200Pa, the partial data that records sees also form 4.

Form 4:

Pressure (Pa)	Air quantity Q (m3/s)	The magnification factor of air-flow	Be three times in the mean velocity (m/s) at orifice size place apart from nozzle
				200	0.23	14.09	1.24
250	0.27	14.32	1.36
				300	0.29	14.49	1.49
500	0.39	14.86	1.85

Embodiment 6:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

The diameter of nozzle is 200mm, and the requirement of air quantity Q is for being not less than 0.15m³/ s, the distance that is used to form between the apparent surface of relief opening is 1.33mm.

Said apparatus in use by regulating the gauge pressure size of air-flow in the inner passage, as from 200Pa to 1500Pa, makes the requirement that can satisfy air quantity Q.

A kind of method that is applied in the generation air-flow in the fan, as different from Example 2:

1, the requirement of air quantity Q is for being not less than 0.15m³/ s, the distance that is used to form between the apparent surface of relief opening is 1.33mm, the diameter of nozzle is 200mm;

2, keep relief opening constant, increase the pressure of air-flow in the inner passage gradually, as increasing to 1500Pa from 200Pa, the partial data that records sees also form 5.

Form 5:

Pressure (Pa)	Air quantity Q (m3/s)	The magnification factor of air-flow	Be three times in the mean velocity (m/s) at orifice size place apart from nozzle
				200	0.17	11.78	1.53
300	0.21	11.82	1.87
				500	0.28	11.87	2.39

Embodiment 7:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

The requirement of air quantity Q is for being not less than 0.30m³/ s, the distance that is used to form between the apparent surface of relief opening is 1.5mm.

Said apparatus in use by regulating the gauge pressure size of air-flow in the inner passage, as from 200Pa to 1000Pa, makes the requirement that can satisfy air quantity Q.

A kind of method that is applied in the generation air-flow in the fan, as different from Example 2:

1, the requirement of air quantity Q is for being not less than 0.30m³/ s, the distance that is used to form between the apparent surface of relief opening is 1.5mm;

2, keep relief opening constant, increase the pressure of air-flow in the inner passage gradually, as increasing to 1000Pa from 200Pa, the concrete data that record see also form 6.

Form 6:

Pressure (Pa)	Air quantity Q (m3/s)	The magnification factor of air-flow	Be three times in the mean velocity (m/s) at orifice size place apart from nozzle
				200	0.30	11.79	1.53
300	0.37	11.99	1.83
				500	0.48	12.10	2.31

Embodiment 8:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

The requirement of air quantity Q is for being not less than 0.35m³/ s, the distance that is used to form between the apparent surface of relief opening is 2.5mm.

Said apparatus in use by regulating the gauge pressure size of air-flow in the inner passage, as from 200Pa to 1500Pa, makes the requirement that can satisfy air quantity Q.

A kind of method that is applied in the generation air-flow in the fan, as different from Example 2:

1, the requirement of air quantity Q is for being not less than 0.35m³/ s, the distance that is used to form between the apparent surface of relief opening is 2.5mm;

2, keep relief opening constant, increase the pressure of air-flow in the inner passage gradually, as increasing to 1500Pa from 200Pa, the partial data that records sees also form 7.

Form 7:

Pressure (Pa)	Air quantity Q (m3/s)	The magnification factor of air-flow	Be three times in the mean velocity (m/s) at orifice size place apart from nozzle
				200	0.38	9.49	1.86
300	0.47	9.53	2.26
				500	0.62	9.57	2.86

Embodiment 9:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

The requirement of air quantity Q is for being not less than 0.40m³/ s, the distance that is used to form between the apparent surface of relief opening is 3mm.

Said apparatus in use by regulating the gauge pressure size of air-flow in the inner passage, as from 200Pa to 1000Pa, makes the requirement that can satisfy air quantity Q.

A kind of method that is applied in the generation air-flow in the fan, as different from Example 2:

1, the requirement of air quantity Q is for being not less than 0.40m³/ s, the distance that is used to form between the apparent surface of relief opening is 3mm;

2, keep relief opening constant, increase the pressure of air-flow in the inner passage gradually, as increasing to 1000Pa from 200Pa, the concrete data that record see also form 8.

Form 8:

Pressure (Pa)	Air quantity Q (m3/s)	The magnification factor of air-flow	Be three times in the mean velocity (m/s) at orifice size place apart from nozzle
				200	0.42	8.61	2.06
300	0.52	8.66	2.50
				500	0.68	8.67	3.16

Embodiment 10:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

The requirement of air quantity Q is for being not less than 2.20m³/ s, the diameter of nozzle is 750mm, the distance that is used to form between the apparent surface of relief opening is 5mm.

Said apparatus in use by regulating the gauge pressure size of air-flow in the inner passage, as from 200Pa to 500Pa, makes the requirement that can satisfy air quantity Q.

A kind of method that is applied in the generation air-flow in the fan, as different from Example 3:

1, the requirement of air quantity Q is for being not less than 2.20m³/ s, the distance that is used to form between the apparent surface of relief opening is 5mm, the diameter of nozzle is 750mm;

2, keep relief opening constant, increase the pressure of air-flow in the inner passage gradually, as increasing to 500Pa from 200Pa, the concrete data that record see also form 9.

Form 9:

Pressure (Pa)	Air quantity Q (m3/s)	The magnification factor of air-flow	Be three times in the mean velocity (m/s) at orifice size place apart from nozzle
				200	2.20	10.26	1.85
300	2.74	10.44	2.20

Embodiment 11:

Shown in Fig. 7,8, a kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

1, also be provided withsecond nozzle 16, describednozzle 16 comprisesinner passage 19,relief opening 18, andrelief opening 18 is arranged on a side ofnozzle 16, makes the gas of discharging fromrelief opening 18 can not produce Coanda effect on nozzle 16.Describedinner passage 19 is communicated withinner passage 15.

Second nozzle 16 is annular, and diameter is less thannozzle 1.

Embodiment 12:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

Described nozzle one end sealing, the other end is communicated with air-flow provides the unit.

Embodiment 13:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

The two ends of described nozzle are all sealed, and the intermediate portion of nozzle is communicated with air-flow provides the unit, thereby the air-flow that makes air-flow provide the unit to provide flows to the inner passage of nozzle the other way around.

Embodiment 14:

A kind of device that is applied in the generation air-flow in the fan, as different from Example 3:

Described nozzle is not ring, and the two ends of nozzle all seal, and the intermediate portion of nozzle is communicated with air-flow provides the unit, thereby the air-flow that makes air-flow provide the unit to provide flows to the inner passage of nozzle the other way around.

The area of the relief opening on the nozzle is converted to round area, and this diameter of a circle is the equivalent diameter of nozzle, and the pressure of air-flow is selected then can draw according to this equivalence diameter, air quantity Q in the inner passage of nozzle.

It is gas injection device that said flow provides unit further, and any unit for generation of gas stream in this way is as blower or vacuum source.

Nozzle can also be other shape, as ellipse, single line, heart, shape such as petal.Owing to do not have blade, therefore can in the opening that nozzle limits, lighting installation, adornment be set.

Claims (17)

1. airflow generating method that is applied in the fan is characterized in that:

Air-flow generation unit, nozzle are provided, and described nozzle has inner passage, relief opening, the internal communication of described inner passage and described air-flow generation unit;

The air-flow that the air-flow generation unit provides feeds described inner passage, and the gauge pressure of air-flow is in [50Pa, 5000Pa] in the inner passage;

Air-flow in the inner passage is discharged from relief opening, and the gas of discharge does not produce Coanda effect on nozzle, and the gas of discharging from relief opening has entrainmented the gas of relief opening periphery, and the flow that entrainments gas is that relief opening is discharged more than 2 times of gas flow.

2. airflow generating method according to claim 1, it is characterized in that: the distance that is used to form the apparent surface of relief opening is 0.2-10mm.

3. airflow generating method according to claim 1, it is characterized in that: the distance that is used to form the apparent surface of relief opening is 0.8-3mm.

4. airflow generating method according to claim 1, it is characterized in that: the gauge pressure of air-flow is 200-700Pa in the inner passage.

5. airflow generating method according to claim 1, it is characterized in that: the gauge pressure of air-flow is 200-500Pa in the inner passage.

6. airflow generating method according to claim 1 is characterized in that: described nozzle is annular.

7. airflow generating method according to claim 1, it is characterized in that: at least one end of described nozzle seals.

8. airflow generating method according to claim 1, it is characterized in that: described air-flow generation unit comprises motor, on the rotatingshaft of motor impeller is installed; Motor and impeller are installed in the housing, and housing is provided with suction port.

9. air flow-producing device that is applied in the fan is characterized in that: described air flow-producing device comprises,

The air-flow generation unit;

Nozzle, described nozzle has inner passage, relief opening, the internal communication of described inner passage and described air-flow generation unit; The relation of the air quantity Q that the area A of relief opening and described device produce is:

$\frac{Q}{2700}<A<\frac{Q}{27};$

The air-flow that the air-flow generation unit provides feeds described inner passage, discharges from relief opening afterwards;

The gas of discharging from relief opening does not produce Coanda effect on nozzle.

10. air flow-producing device according to claim 9 is characterized in that: the relation of the air quantity Q that the area A of relief opening and described device produce is:

11. air flow-producing device according to claim 10 is characterized in that: the relation of the air quantity Q that the area A of relief opening and described device produce is:

12. air flow-producing device according to claim 10 is characterized in that: the distance that is used to form the apparent surface of relief opening is 0.2-10mm.

13. air flow-producing device according to claim 10 is characterized in that: the distance that is used to form the apparent surface of relief opening is 0.8-3mm.

14. air flow-producing device according to claim 10 is characterized in that: described nozzle is annular.

15. air flow-producing device according to claim 10 is characterized in that: at least one end of described nozzle seals.

16. air flow-producing device according to claim 10 is characterized in that: described relief opening is arranged on a side of nozzle.

17. air flow-producing device according to claim 10 is characterized in that: described air-flow generation unit comprises motor, on the rotatingshaft of motor impeller is installed; Motor and impeller are installed in the housing, and housing is provided with suction port.

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