CN218439903U - Air supply device assembly - Google Patents

Abstract

The utility model discloses an air supply arrangement assembly, including the wind channel subassembly to and be used for producing the air-out subassembly of air current, the wind channel subassembly is including preceding frame, center and the after-frame that is used for constituting the wind channel, the after-frame forms the air intake in center one side, preceding frame forms the air outlet at the center opposite side, the center seals in wind channel week side, just the center corresponds the air intake and is formed with the wind-guiding position that is the horn mouth form, a plurality of wind-guiding grooves have been seted up about circumference on the wind-guiding position, the wind-guiding groove sets up about the air current route, the air current route in the wind channel is injectd and the air outlet department air current is restrainted in wind-guiding position and wind-guiding groove, increases the air-out effect.

Description

Air supply arrangement assembly

Technical Field

The utility model relates to a fan equipment technical field, concretely relates to air supply arrangement assembly.

Background

At present, the appearance of the traditional household fan changes little in recent decades, and the traditional structures such as the structures of a front mesh enclosure, a rear mesh enclosure and fan blades are typically adopted, the fan blades in the combination rotate to generate air flow, and the front mesh enclosure and the rear mesh enclosure only play a role in protection. With the improvement of living standard of people, people put forward new requirements on individuation and functionality of products, and hope that bright products come out in front of the products in appearance; the fan which has large air volume and long air supply distance and can increase indoor air circulation is urgent for people at present.

As shown in fig. 1, the blade assembly component of the conventional fan includes: the fan blade fixing device comprises a motor, fan blades, a front net cover, a rear net cover, a fixing ring, a fan blade fixing knob, a motor support, a machine head front cover, a machine head rear cover and the like. The rear mesh enclosure is sleeved on the front cover of the machine head and fixed by a fixing ring, the fan blades are installed on the motor shaft, the front end of the fan blades is fixed by a fan blade fixing knob, and the front mesh enclosure is installed in place through a slide fastener and the rear mesh enclosure and fixed with the rear mesh enclosure through a lower side screw. In the working process, air flow enters from the rear mesh enclosure and is exhausted from the front mesh enclosure after being accelerated by the fan blades to form an air supply process.

The prior art fan has the following technical defects:

1. the blown wind is easy to dissipate after being discharged out of the front mesh enclosure, and the air supply distance is influenced. When the fan blades rotate, resonance is easily caused, the fan blades shake, the wind direction is unstable, and the air supply performance of the fan blades is reduced. The specific reasons include: the existing household fan has the advantages of small quantity of fan blades, small air cut quantity, low airflow velocity and easy diffusion;

2. the curved surface design of the blade is simpler, the leading edge curve, the trailing edge curve, the blade root curve and the blade tip curve are basically curves with single radian, and the thickness of the blade is consistent, so that the fan blade with the structure has low output wind speed and large wind noise in work;

3. the side surface of the mesh enclosure of the existing fan blade is provided with a hole, air flow enters from the holes on the back surface and the side surface together when air enters, and the fan blade can vibrate greatly due to air enters at different positions; air quantity waste can be caused by air outlet, and airflow escapes from the side hole;

4. the gap between the side surface of the mesh enclosure and the fan blades in the prior art is large, and the air supply distance is short due to diffusion after the air is supplied out of the front mesh enclosure.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide an air supply arrangement assembly increases the air-out effect.

The above technical object of the present invention can be achieved by the following technical solutions: an air supply device assembly comprises an air duct assembly and an air outlet assembly used for generating air flow, wherein the air duct assembly comprises a front frame, a middle frame and a rear frame which are used for forming an air duct, the rear frame forms an air inlet on one side of the middle frame, the front frame forms an air outlet on the other side of the middle frame, the middle frame is sealed on the peripheral side of the air duct, a bell-mouth-shaped air guide part is formed on the middle frame corresponding to the air inlet, a plurality of air guide grooves are formed in the air guide part in the circumferential direction and are arranged in the air flow path, the air guide part and the air guide grooves limit the air flow path in the air duct and restrain the air flow at the air outlet.

Further, the wind-guiding position includes inlet air section and pressure boost section, the inlet air section is the flaring setting towards the air intake, the pressure boost section links up the receipts mouth department of inlet air section and sets up towards the air outlet, and through above improvement, the inlet air section of flaring form venturi effect to increase the wind speed.

Furthermore, the air guide groove comprises a first boundary and a second boundary which are arranged in relation to the air outlet direction, the first boundary and the pressurization section are in a roughly parallel trend and are connected with the air inlet section, the second boundary is arranged towards the air inlet in a flaring mode, and the closing opening of the second boundary is connected with the pressurization section.

Further, the air guide grooves are arranged between the air inlet section and the pressurization section at intervals, or the air guide grooves are arranged on the pressurization section, or the air guide grooves are arranged on the air inlet section.

Further, the air guide groove is at least arranged on the radial outer side of the pressurizing section and forms a first surface air guide surface, and the air inlet section and the surface of the pressurizing section form a second surface air guide surface.

Further, the air outlet assembly comprises a hub part and a fan blade, a gap is preset between the outer side surface of the fan blade and any surface of the middle frame, the gap is 2-10 mm, and through the improvement, the shaking and noise of the fan blade during rotation are controlled by adjusting the gap between the fan blade and the middle frame.

Further, the projection angle of the tangential angle of the blade root curve on the plane where the hub part axis is located is A, and the included angle A ranges from 35 degrees to 52 degrees;

the projection angle of the tangential angle of the blade tip curve on the plane of the hub part axis is B, and the included angle B ranges from 11 degrees to 24 degrees.

Furthermore, the fan blade comprises an air inlet edge and an air outlet edge which are opposite to the airflow direction;

the air inlet edge is provided with a first air inlet curve and a second air inlet curve which are sequentially arranged towards the hub part, the second air inlet curve is arranged to protrude out of the first air inlet curve, and the first air inlet curve and the second air inlet curve are in curvature transition;

the air outlet edge is provided with a first air outlet curve and a second air outlet curve which are sequentially arranged towards the wheel hub part, the first air outlet curve protrudes out of the second air outlet curve, and the curvature of the first air outlet curve and the curvature of the second air outlet curve are in transition.

Furthermore, the first air outlet curve extends out of the hub part relative to the air flow direction, and the air inlet edge is located at the rear part of the air outlet edge relative to the air flow direction.

Further, the thickness of the fan blade increases towards the middle.

Furthermore, the cross-sectional area of the air guide groove is reduced relative to the air outlet direction, and any cross section of the air guide groove is arranged in an isosceles trapezoid shape.

Compared with the prior art, the utility model has the advantages of it is following and beneficial effect: 1. the middle frame is arranged between the front frame and the rear frame and is sealed on the peripheral side of the air channel, so that a complete annular cavity channel is formed, the loss of air volume is reduced, the diffusion of an air flow path is controlled, a Venturi effect is formed through a bell-mouthed air guide part on the middle frame, the air flow speed is accelerated, the air flow is further pressurized, guided and rectified through an air guide groove of the air guide part, the output directivity of the air flow is given, the air flow enters the air channel orderly along the surface of the middle frame, the air noise generated by the air flow at the part is reduced, the resonance is reduced, and the air supply distance of the air flow is increased;

2. in the air outlet process, the fan blades directly rotate to form main airflow, the main airflow moves to generate negative pressure at the air inlet and then is sucked, secondary airflow is formed on the surface layer of the middle frame, the secondary airflow is output along the airflow path, and the secondary airflow is mixed with the main airflow in a gap between the fan blades and the supercharging mesh enclosure, is used for supercharging, accelerating and guiding the mixed airflow under the guidance of the surface of the middle frame, and is ejected from an air outlet of the front mesh enclosure;

3. the shape of the air flow at the air outlet can be adjusted by adjusting the shape of the opening of the pressurizing section, so that the shapes of a diffusion type, a non-diffusion type, a focusing type and the like can be obtained.

Drawings

FIG. 1 is a schematic view of a prior art air duct assembly;

FIG. 2 is a schematic structural view of the air supply device assembly of the present invention;

fig. 3 is a schematic structural view of another angle of the air supply device assembly of the present invention;

fig. 4 is a cross-sectional view of the present invention;

FIG. 5 is an enlarged view taken at A in FIG. 4;

fig. 6 is a top view of the fan blade of the present invention;

fig. 7 is a structural diagram of the fan blade of the present invention;

fig. 8 is a schematic structural view of the middle frame of the present invention;

fig. 9 is an exploded view of the present invention;

fig. 10 is a schematic cross-sectional view of an air guide groove of the present invention;

fig. 11 is a front view schematically illustrating the present invention;

fig. 12 is a schematic view of a fan blade and a local hub of the present invention;

FIG. 13 isbase:Sub>A cross-sectional view taken at A-A of FIG. 12;

FIG. 14 is a cross-sectional view taken at B-B of FIG. 12;

FIG. 15 is a cross-sectional view taken at C-C of FIG. 12;

FIG. 16 is a cross-sectional view taken at D-D of FIG. 12;

FIG. 17 is a schematic view of a tangential wind angle B at the tip of the blade;

FIG. 18 is a schematic view of the wind cutting angle A at the root of the blade;

in the figure: 1. a front frame; 2. a middle frame; 3. a rear frame; 4. an air inlet; 5. an air outlet;

6. a wind guiding part; 6.1, an air inlet section; 6.2, a pressurization section; 6.3, third boundary;

7. a wind guide groove; 7.1, a first boundary; 7.2, a second boundary;

8. a hub portion;

9. a fan blade; 9.1, air inlet edge; 9.11, a first air inlet curve; 9.12, a second air inlet curve;

9.2, air outlet edge; 9.21, a first air outlet curve; 9.22, a second air outlet curve;

9.3, root curve; 9.4, leaf tip curve;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that, although the terms upper, middle, lower, top, end, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another for ease of understanding, and are not used to define any direction or order of limitation.

As shown in fig. 1-11, an air supply device assembly includes an air duct assembly and an air outlet assembly for generating air flow, the air duct assembly includes a front frame 1, a middle frame 2 and a rear frame 3 for constituting an air duct, the rear frame 3 forms an air inlet 4 at one side of the middle frame 2, the front frame 1 forms an air outlet 5 at the other side of the middle frame 2, the middle frame 2 is sealed at the peripheral side of the air duct to form a complete annular air cavity, the air outlet assembly includes a hub part 8 located at the middle part and fan blades 9 formed on the hub part 8, in the working process, the air is cut by the rotation of the fan blades 9 to form air flow, an air flow path is formed by the annular air cavity, and when the air flow passes through the middle frame 2, the air flow is pressurized, accelerated and guided, and finally emitted from the air outlet 5 of the front frame 1.

Alternatively, the middle frame 2 may be integrally formed on the peripheral side boundary of the rear frame 3.

As a further embodiment of the middle frame 2, a bell mouth-shaped air guide portion 6 is formed on the middle frame 2 corresponding to the air inlet 4, the bell mouth-shaped air guide portion 6 forms a venturi effect at the air inlet 4, so that the air flow is accelerated and pressurized after passing through the middle frame 2, in addition, a plurality of air guide grooves 7 are formed on the air guide portion 6 in the circumferential direction, the air guide grooves 7 are arranged in relation to an air flow path, and the air guide grooves 7 have a certain length in relation to the air flow direction, so that the air flow is combed and guided by the air guide grooves 7, the surface layer air flow on the inner wall of the middle frame 2 is given with the output direction towards the air outlet 5, the guiding direction is consistent, the diffusion of the air flow is reduced, and the wind noise and the vibration of the fan during operation are reduced by the regular air flow.

As shown in fig. 5, specifically, the air guiding portion 6 includes an air inlet section 6.1 and a pressure increasing section 6.2, the air inlet section 6.1 is disposed in a flaring manner toward the air inlet 4, the pressure increasing section 6.2 is connected to a closing opening of the air inlet section 6.1 and disposed toward the air outlet 5, the flaring air inlet section 6.1 forms a venturi effect, so as to increase the air speed, and the air flow passes through the air inlet section 6.1 and then is pressurized in the pressure increasing section 6.2, so that the air guiding portion 6 and the air guiding groove 7 define an air flow path in the air duct and constrict the air flow at the air outlet 5.

Optionally, the pressurizing section 6.2 also has a closing tendency towards the air outlet 5, so as to further improve the air flow converging and pressurizing effect.

As a further embodiment of the air guiding groove 7, the air guiding groove 7 includes a first boundary 7.1 and a second boundary 7.2 arranged in relation to the air outlet direction, and a third boundary 6.3 coinciding with the air inlet section 6.1 is further provided between the air guiding grooves 7, wherein the first boundary 7.1 and the second boundary 7.2 have a tendency to flare in relation to the third boundary 6.3, the first boundary 7.1 and the pressurizing section 6.2 have a substantially parallel tendency and are connected to the air inlet section 6.1, the second boundary 7.2 is arranged in a flaring manner towards the air inlet 4, and the mouth of the second boundary 7.2 is connected to the pressurizing section 6.2, by the above improvement, the laminar air flow is further pressurized by the second boundary 7.2, the primary air flow and the laminar air flow are combingly guided by the first boundary 7.1 and the third boundary 6.3, and the second boundary 7.2 and the air inlet section 6.1 both have a tendency to converge towards the air outlet 5, thereby converging the air flow and preventing the inner air flow from diffusing.

In the embodiment, the air guide groove 7 is connected to the supercharging section 6.2 from the air inlet section 6.1, and the airflow vortex is interrupted by the air guide groove 7, so that the noise of the airflow at the part is reduced.

Preferably, the first boundary 7.1 is approximately parallel to the air inlet section 6.1 and has a tendency to close towards the air outlet 5.

In other embodiments, as an arrangement manner of the air guide grooves 7, the air guide grooves 7 are arranged between the air inlet section 6.1 and the supercharging section 6.2 at intervals, or the air guide grooves 7 are arranged on the supercharging section 6.2, or the air guide grooves 7 are arranged on the air inlet section 6.1.

Specifically, the air guide groove 7 is at least arranged on the radial outer side of the pressurizing section 6.2 and forms a first surface air guide surface, and the surfaces of the air inlet section 6.1 and the pressurizing section 6.2 form a second surface air guide surface.

Specifically, the cross-sectional area of the air guide groove 7 is reduced in relation to the air outlet direction, any cross section of the air guide groove 7 is in an isosceles trapezoid shape, and through the improvement, the guiding effect of the air guide groove is further improved, so that the air guide groove is in a bundling shape towards the air outlet center, and air flow can be gathered better.

On the basis of the above embodiment, the embodiment of the air outlet assembly is further explained, the air outlet assembly includes a hub portion 8 and a fan blade 9, a gap is preset between the outer side surface of the fan blade 9 and any surface of the middle frame 2, the gap is 2-10 mm, and through the above improvement, the gap between the fan blade 9 and the middle frame 2 is adjusted, so as to control the shaking and noise of the fan blade 9 during rotation.

As shown in fig. 16 and 17, specifically, a projection angle of the tangential wind angle of the root curve 9.3 on the plane where the axis of the hub portion 8 is located is a, and the included angle a ranges from 35 ° to 52 °;

the projection angle of the tangential wind angle of the blade tip curve 9.4 on the plane where the axis of the hub part 8 is located is B, and the range of the included angle B is 11-24 degrees.

The angle setting is selected, so that the fan blade is gentle towards the blade tip and axial towards the blade root, the air flow at the blade tip is favorably guided by the fan blade, and the fan blade is guided by the curved surface close to the blade root to output axially.

As shown in fig. 6 to 8, as a further explanation of the fan blade 9, the surface of the fan blade 9 is designed as a curved surface, the fan blade 9 includes an air inlet edge 9.1 and an air outlet edge 9.2 opposite to the airflow direction, and the air inlet edge 9.1 is located at the rear of the air outlet edge 9.2 with respect to the airflow direction;

the air inlet edge 9.1 is provided with a first air inlet curve 9.11 and a second air inlet curve 9.12 which are sequentially arranged towards the hub part 8, the second air inlet curve 9.12 is arranged to be protruded out of the first air inlet curve 9.11, and the first air inlet curve 9.11 and the second air inlet curve 9.12 are in curvature transition;

air-out edge 9.2 has first air-out curve 9.21 and the second air-out curve 9.22 that arranges in proper order towards hub portion 8, first air-out curve 9.21 protrusion sets up in second air-out curve 9.22, just the camber is passed through between first air-out curve 9.21 and the second air-out curve 9.22.

Through the fan blade 9, the second air inlet curve 9.12 of the front edge curve is convexly arranged, so that the inner side of the fan blade 9 firstly cuts air, thereby reducing the difference of the air speeds of the inner side and the outer side of the fan blade 9, and the first air outlet curve 9.21 of the rear edge curve is convexly arranged, so that air flow flows out of the outer side of the fan blade 9 after cutting the air, the stability of the fan blade 9 is improved, the difference of the air speeds of the outer side air flow is reduced, the air flow output is more stable, the air speed is more consistent in the whole air outlet area range due to the shape of the fan blade 9, and better air volume control and air noise control can be achieved through the gap control between the fan blade and the middle frame 2; better air volume control and wind noise control can be achieved through distance control between the wind power generation device and the front mesh enclosure.

Specifically, the first outlet curve 9.21 extends out of the hub portion 8 with respect to the airflow direction, and further guides the outlet airflow to gather and restrict the airflow within a desired outlet area.

In other embodiments, as shown in fig. 12 to 16, the blade obtains a section a through a plane parallel to the rotation axis, and the section a and the blade root curve have an intersection point, when the section a is located at the blade tip, the intersection point is located on the blade root curve and close to or coincident with one end of the wind outlet direction, the section a is shifted along the blade tip towards the blade root, and the intersection point gradually moves downwards along the blade root towards the leeward side.

Optionally, the blade root curve includes a first section and a second section along the air outlet direction, the first section and the second section approximately equally divide the blade root curve, the intersection point advances on the second section along the direction of the blade tip approaching the blade root along the plane, and the section a and the blade root curve form an included angle, the included angle remains unchanged, the intersection point advances on the first section along the direction of the blade tip approaching the blade root along the plane, the included angle is gradually decreased along the blade root approaching the blade root, and the included angle of the section a with respect to the rotation axis becomes smaller.

Through the fan blade arrangement with the profile, the cross section of the fan blade is folded from the tip of the fan blade to the root of the fan blade along the direction close to the root of the fan blade, the gathering effect of the output wind flow is further increased, and the wind flow is prevented from diffusing.

Specifically, the thickness of the fan blade 9 is set to increase gradually towards the middle, and the thickness of the fan blade 9 decreases gradually towards the air inlet edge 9.1 and the air outlet edge 9.2, and through the design of gradually changing the thickness of the fan blade 9, the strength of the fan blade 9 is increased, the deformation of the fan blade 9 is reduced, and therefore the stability and the continuity of the airflow output are increased.

In the above embodiment, the number of the fan blades 9 is 11, so that the air volume is increased, the rotating speed of the fan blades 9 is reduced under the condition of the same air volume, so that the noise is reduced, the diameter of the fan blades 9 is smaller than that of the existing fan blades 9 by increasing the number of the fan blades 9, the angle between the fan blades is reduced by increasing the number of the fan blades 9, the wind cutting efficiency is high during rotation, and the blown air flow is more continuous and natural.

As shown in fig. 4 and 9, in the above embodiment, as a way of assembling the air duct assembly, the air inlet 4 of the rear frame 3 and the middle frame 2 are positioned and installed by the fastening position of the pressurizing middle frame 2 and the rear mesh enclosure. The middle frame 2 is positioned along the raised guide edge of the shaft and the front frame 1, the front frame 1 is positioned with the rear frame 3 and the middle frame 2 through the guide structure and then fixed by screws, the rear frame 3, the middle frame 2 and the front frame 1 are installed to form a complete middle-through air channel, a closed interlayer space is formed among the three parts, air is fed from the air inlet 4 of the rear frame 3, and the air is blown out from the air outlet 5 of the front frame 1.

Specifically, the rear frame 3 is provided with a positioning concave seat facing the front frame 1, a positioning convex block is arranged on the circumferential surface of the middle frame 2, the positioning concave seat is provided with a first inclined surface at the axial outer side, the positioning convex block is provided with a second inclined surface facing the positioning concave seat, and the positioning convex block is arranged in the positioning groove to realize the positioning of the middle frame 2 and the rear frame 3.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims (10)

1. The air supply device assembly is characterized by comprising an air duct assembly and an air outlet assembly used for generating air flow, wherein the air duct assembly comprises a front frame (1), a middle frame (2) and a rear frame (3) which are used for forming an air duct, the rear frame (3) forms an air inlet (4) at one side of the middle frame (2), the front frame (1) forms an air outlet (5) at the other side of the middle frame (2), the middle frame (2) is sealed at the peripheral side of the air duct, a horn-mouth-shaped air guide part (6) is formed on the middle frame (2) corresponding to the air inlet (4), a plurality of air guide grooves (7) are formed in the air guide part (6) in the peripheral direction, the air guide grooves (7) are arranged in relation to air flow paths, and the air guide part (6) and the air guide grooves (7) limit the air flow paths in the air duct and restrain the air flow at the air outlet (5).

2. An air supply arrangement assembly as recited in claim 1, further comprising: wind-guiding position (6) are including inlet air section (6.1) and pressure boost section (6.2), inlet air section (6.1) is the flaring setting towards air intake (4), pressure boost section (6.2) link up the receipts mouth department of inlet air section (6.1) and set up towards air outlet (5).

3. An air supply arrangement assembly as recited in claim 2, further comprising: the air guide groove (7) comprises a first boundary (7.1) and a second boundary (7.2) which are arranged in relation to the air outlet direction, the first boundary (7.1) and the pressurization section (6.2) are in a roughly parallel trend and are connected with the air inlet section (6.1), the second boundary (7.2) faces the air inlet (4) and is in flaring arrangement, and the closing opening of the second boundary (7.2) is connected with the pressurization section (6.2).

4. An air supply arrangement assembly as recited in claim 2, further comprising: the air guide grooves (7) are arranged between the air inlet section (6.1) and the pressurization section (6.2) at intervals, or the air guide grooves (7) are arranged on the pressurization section (6.2), or the air guide grooves (7) are arranged on the air inlet section (6.1).

5. An air supply arrangement assembly as recited in claim 2, further comprising: the air guide groove (7) is at least arranged on the radial outer side of the pressurizing section (6.2) and forms a first surface air guide surface, and the surfaces of the air inlet section (6.1) and the pressurizing section (6.2) form a second surface air guide surface.

6. An air supply arrangement assembly as recited in claim 1, further comprising: the air outlet assembly comprises a hub part (8) and a fan blade (9), a blade root curve (9.3) is formed between the fan blade (9) and the hub part (8), a blade tip curve (9.4) is formed on the outer side surface of the fan blade (9), a gap is preset between the outer side surface of the fan blade (9) and any surface of the middle frame (2), and the gap is 2-10 mm.

7. An air supply arrangement assembly as recited in claim 6, further comprising: the projection angle of the tangential wind angle of the blade root curve (9.3) on the plane where the axis of the hub part (8) is located is A, and the included angle A ranges from 35 degrees to 52 degrees;

the projection angle of the tangential wind angle of the blade tip curve (9.4) on the plane of the axis of the hub part (8) is B, and the included angle B ranges from 11 degrees to 24 degrees.

8. An air supply arrangement assembly as recited in claim 6, further comprising: the fan blade (9) comprises an air inlet edge (9.1) and an air outlet edge (9.2) which are opposite to the airflow direction;

the air inlet edge (9.1) is provided with a first air inlet curve (9.11) and a second air inlet curve (9.12) which are sequentially arranged towards the hub part (8), the second air inlet curve (9.12) is arranged by protruding out of the first air inlet curve (9.11), and the first air inlet curve (9.11) and the second air inlet curve (9.12) are in curvature transition;

air-out edge (9.2) have towards wheel hub portion (8) first air-out curve (9.21) and second air-out curve (9.22) that arrange in proper order, first air-out curve (9.21) protrusion sets up in second air-out curve (9.22), just camber transition between first air-out curve (9.21) and second air-out curve (9.22).

9. An air supply arrangement assembly as recited in claim 8, further comprising: the first air outlet curve (9.21) extends out of the hub part (8) relative to the air flow direction, and the air inlet edge (9.1) is positioned at the rear part of the air outlet edge (9.2) relative to the air flow direction.

10. An air supply arrangement assembly as recited in claim 8, further comprising: the thickness of the fan blade (9) is gradually decreased towards the air inlet edge (9.1) and the air outlet edge (9.2) relative to the tangential direction, and the thickness of the fan blade is gradually decreased towards the blade tip curve (9.4) relative to the rotating plane.

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