CN214247802U - Wind-guiding structure and fan - Google Patents

Abstract

The utility model relates to a wind-guiding structure, including lining up barrel (1) that is used for the wind-guiding, lining up in barrel (1) along radially being divided into inside and outside two runners that separate each other, be first runner (2) and second runner (3) respectively, first runner (2) are in the inboard, second runner (3) are in the outside, and first runner (2) entry is equipped with a plurality of first guide plates (4) along circumference, and second runner (3) export is equipped with a plurality of second guide plates (5) along circumference, and the advantage is: noise can be reduced; still provide a fan, adopt aforementioned wind-guiding structure, be favorable to reducing the noise of fan.

Description

Wind-guiding structure and fan

Technical Field

The utility model relates to a fan technical field especially relates to a wind-guiding structure.

Background

In a vacuum cleaner, a fan bears a core function of forming negative pressure to form suction force, so that the suction efficiency is improved, the noise is reduced, and the improvement of the performance of the vacuum cleaner and the improvement of the use experience are greatly facilitated, while the structure of the fan is relatively complex, so that the improvement direction is uncertain, that is, no improvement point is main, so to say, each point related to the composition structure of the fan may have a great influence on the performance of the fan, but there is a point that the applicant considers that attention must be paid and improvement is a difficult point of improvement, that is, the problem of noise is noise, the noise is actually energy consumption, the consumption of the energy is waste, and if the noise can be reduced, that is, the energy is transferred to other places, so that the foundation and the assistance are provided for the improvement of the suction efficiency. In addition, because a large number of hand-held cleaners and portable cleaners are widely popularized and applied, the noise control of the cleaners is becoming more important.

SUMMERY OF THE UTILITY MODEL

Problem (A)

The utility model discloses the technical problem that will solve is: the defects of the prior art are overcome, and the air guide structure is provided, so that the noise can be reduced; the utility model provides a fan, adopts aforementioned wind-guiding structure, is favorable to reducing the noise of fan.

(II) technical scheme

In order to solve the technical problem, the utility model provides a wind-guiding structure, concrete technical scheme is as follows:

the utility model provides a wind-guiding structure, including the barrel that link up that is used for the wind-guiding, link up in the barrel along radially being divided into inside and outside two runners that separate each other, be first runner and second runner respectively, first runner is in the inboard, and the second runner is in the outside, and first runner entry is equipped with a plurality of first guide plates along circumference, and the second runner export is equipped with a plurality of second guide plates along circumference.

Preferably, each first guide plate is transversely deflected relative to the radial line, and the air inlet end of the first guide plate faces the air flow, so that the better guide effect is achieved, and noise reduction is facilitated.

Preferably, the air inlet end of first guide plate is equipped with the breach portion that is located radial outside, and the breach portion narrows down with the linking department of the radial inboard part of air inlet end and links up, like this, can break up the air current, avoids forming the vortex to more be favorable to making an uproar.

Preferably, the left and right sides face of the first guide plate is connected with the two sides of the notch part through the first flow guide curved surface, so that the better flow guide effect is achieved, and noise reduction is facilitated.

Preferably, the end face of the part of the radial inner side of the air inlet end is a second flow guide curved surface which is arranged in a linear shape, and the two sides of the second flow guide curved surface are connected with the left side face and the right side face of the first flow guide plate, so that the air flow can be better guided into the second flow channel, a better flow guide effect is achieved, and noise reduction is facilitated.

Preferably, breach portion adopts arc breach portion, like this, has better water conservancy diversion effect, is favorable to making an uproar.

Preferably, the air-out end of first guide plate is the concave yield structure, and the concave yield structure is equipped with third water conservancy diversion curved surface, and the both sides of this third water conservancy diversion curved surface link up with the left and right sides face of first guide plate, like this, have the water conservancy diversion effect better, and simultaneously, the design of concave yield structure makes the air current when breaking away from first guide plate, and difficult noise that produces is consequently synthesized, more is favorable to making an uproar.

Preferably, the concave structure is an arc concave structure, so that noise reduction is facilitated.

Preferably, along the air current direction of flow, first guide plate is located the front side of second guide plate, like this, has better water conservancy diversion effect, is favorable to making an uproar to fall.

Preferably, the first flow channel and the second flow channel are separated by the isolating ring, the first guide plate is arranged at the front end of the isolating ring, and the second guide plate is arranged between the isolating ring and the through cylinder body.

Preferably, the front end of the first flow channel is provided with a bearing seat for installing a rotating shaft of the motor, and a first guide plate is arranged between the bearing seat and the isolation ring, so that the structure is compact, the first guide plate can be better fixed, the rotating shaft of the motor is favorably rotated and supported, the concentricity of the first flow channel and the motor is favorably ensured, the flow guiding is favorably realized, and the noise reduction is favorably realized.

Preferably, the front end of the isolating ring is divided into a plurality of areas by the first guide plate along the circumferential direction, and each area is provided with a fourth flow guide curved surface, so that the isolating ring has a better flow guide effect and is beneficial to noise reduction.

Preferably, an air chamber is arranged on the air inlet side penetrating through the cylinder body, a wind wheel is arranged in the air chamber, an air inlet is arranged at the front end of the air chamber, an air outlet is arranged at the rear end of the air chamber, and the air outlet is communicated with the first flow channel and the second flow channel, so that the conversion efficiency is improved, the energy can be converted better, and stronger air flow is formed.

Preferably, the rear end of the air chamber adopts a first air guide wheel which is used for guiding the air flow to the first flow channel and the second flow channel, so that the air guide device has a better air guide effect, is beneficial to noise reduction and is more efficient.

Preferably, the second guide plate extends to the entry of second runner, the part of extension is used for the export with the air current direction second guide plate, or, the second runner still is equipped with the second inducer, this second inducer is used for leading the air current to the runner entry between every adjacent second runner, again through the export outflow of second guide plate, thus, have better water conservancy diversion effect, be favorable to making an uproar, and set up the second inducer alone, can greatly reduce the manufacturing degree of difficulty, in addition, also conveniently to the adjustment of second inducer, when this adjustment is favorable to the experiment, conveniently produce multiple combination with the second guide plate, can test more high-efficiently.

(III) technical effects

Adopt the utility model discloses in a disclosed wind-guiding structure, can effectively solve the not enough of prior art.

The inner part of the through cylinder body is divided into an inner flow passage and an outer flow passage which are separated from each other along the radial direction, the inlet of the first flow passage is provided with a plurality of first guide plates along the circumferential direction, the outlet of the second flow passage is provided with a plurality of second guide plates along the circumferential direction, the design can better guide the air flow, besides the air flow inlet and the air flow outlet, the air flows in the two flow passages can not interact with each other, in addition, the through cylinder has the first flow passage, the second flow passage, the first guide plates and the second guide plates, and provides a foundation for screening out a structure with lower noise, for example, according to the requirements of the diameter, the flow speed, the flow quantity and the like of the air guide structure, the flow guide condition can be changed by adjusting the size, the angle, the size of the flow section of the first flow passage, the size of the flow section of the second flow passage and the like, thereby screening out and determining the combination with lower noise, therefore, the comprehensive above structure can be favorable for reducing the noise, in addition, the efficiency is also improved.

(IV) technical scheme

In order to solve the technical problem, the utility model provides a fan, concrete technical scheme is as follows:

the fan comprises a wind guide structure, a motor and a wind wheel, wherein the wind guide structure is connected with the motor, part or all of the motor is inserted into a first flow channel, a first guide plate is positioned between the wind wheel and the motor, a rotating shaft of the motor is connected with the wind wheel, and the motor is used for driving the wind wheel to rotate to generate airflow.

Preferably, the motor includes a rear bracket, and the rear bracket is connected with the through cylinder and coaxially arranged, so that the structure is more compact while the motor is supported.

Preferably, the rear support includes that wind-guiding circle and a plurality of connecting seats along circumference setting, and wind-guiding circle, connecting seat all are equipped with the water conservancy diversion curved surface, like this, have better water conservancy diversion effect, are favorable to making an uproar to fall.

(V) technical effects

Adopt the utility model discloses in a disclosed fan, can effectively solve the not enough of prior art.

Combine motor and aforementioned wind-guiding structure, be favorable to reducing the noise of fan, in addition, be favorable to compact structure, the high-speed air current in the first runner is also favorable to the heat dissipation of motor.

Drawings

Fig. 1 is one of the three-dimensional schematic views of the air guide structure shown from the air inlet side view angle of the present invention.

Fig. 2 is a second perspective view of the air guiding structure shown from the air inlet side view angle of the present invention.

Fig. 3 is one of the three-dimensional schematic views of the air guiding structure shown from the air outlet side viewing angle of the present invention.

Fig. 4 is a second perspective view of the air guiding structure shown from the air outlet side view angle according to the present invention.

Fig. 5 is a front view of fig. 1 from the air inlet side perspective.

Fig. 6 is an exploded view of the axis of the motor (electrical connection terminals not shown).

Fig. 7 is a perspective view of the motor (without electrical connection terminals).

Fig. 8 is a perspective view of the motor inserted and mounted in the cage.

Fig. 9 is a perspective view of the motor inserted into the cage and without the stator back bracket.

Fig. 10 is a perspective view of the fan from the air inlet side.

Fig. 11 is a perspective view of fig. 10 with the hood removed.

Figure 12 is a perspective view of figure 11 with the rotor removed.

Fig. 13 is a perspective view of fig. 12 with the first inducer exploded along the axial direction.

Fig. 14 is a perspective view of a flow guiding structure provided with a second wind guiding wheel.

Fig. 15 is a perspective view of the second wind guide wheel and the through cylinder being separated and shifted from each other.

Fig. 16 is a perspective view illustrating the first wind-guiding wheel exploded in the axial direction when the second wind-guiding wheel is installed.

Fig. 17 is a perspective view of the first wind wheel from the air outlet side.

Fig. 18 is a second perspective view of the first wind wheel from the wind outlet side.

Fig. 19 is a third perspective view of the first wind wheel from the wind outlet side.

Fig. 20 is a perspective view of the connection of the rear bracket to the through barrel.

Fig. 21 is a perspective view of the stator and rotor of the motor with the rear bracket connected to the through barrel.

Fig. 22 is a perspective view of the rear bracket.

Fig. 23 is one of perspective views illustrating an outlet of the air outlet of the first air guiding wheel for flowing to the first air guiding plate and a relative position between the outlet and the first air guiding plate.

Fig. 24 is a second perspective view for illustrating the outlet of the first air guiding wheel for flowing to the first air guiding plate and the relative position between the outlet and the first air guiding plate.

[ description of reference ]

1. The cylinder body is penetrated; 2. a first flow passage; 3. a second flow passage; 4. a first baffle; 5. a second baffle; 6. a radial line; 7. a notch portion; 8. a joint; 9. a side surface; 10. a first flow guiding curved surface; 11. a second flow guiding curved surface; 12. a third flow guiding curved surface; 13. an isolation ring; 14. a bearing seat; 15. a fourth flow guiding curved surface; 16. a fan housing; 17. a wind wheel; 18. an air inlet; 19. a first inducer; 20. a second inducer; 21. a stator; 22. a stator front bracket; 23. a stator rear bracket; 24. a terminal block; 25. an electrical connection terminal; 26. a rear bracket; 27. a wind guide ring; 28. a connecting seat; 29. a flow guiding curved surface; 30. a first mounting surface; 31. a second mounting surface; 32. a threaded hole; 33. connecting holes; 34. a third baffle; 35. a rotating shaft; 36. a bearing; 37. a rotor; 38. a stator through-hole; 39. a stator fixing plate; 40. a fourth baffle; 41. a fifth baffle; 42. and (4) a tail section.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

The first embodiment is as follows:

as shown in fig. 1, 2, 3, and 4, the air guiding structure includes a through cylinder 1 for guiding air, the through cylinder 1 is divided into two inner and outer flow passages along a radial direction, the inner flow passage is a first flow passage 2 and a second flow passage 3, the first flow passage 2 is on the inner side, the second flow passage 3 is on the outer side, a plurality of first flow deflectors 4 are disposed at an inlet of the first flow passage 2 along a circumferential direction, and a plurality of second flow deflectors 5 are disposed at an outlet of the second flow passage 3 along the circumferential direction. In this example, the penetrating cylinder 1 is substantially cylindrical. The first guide plate 4 and the second guide plate 5 are uniformly distributed along the circumferential direction.

The first flow channel 2 and the second flow channel 3 are separated by an isolation ring 13, a first guide plate 4 is arranged at the front end of the isolation ring 13, and a second guide plate 5 is arranged between the isolation ring 13 and the through cylinder 1. The cage 13 is substantially cylindrical. The cage 13 is shorter than the through cylinder 1 and is arranged at the following relative positions: the front end of the isolation ring 13 is lower than the front end of the through cylinder 1, and the rear end of the isolation ring 13 is lower than the rear end of the through cylinder 1. The baffle ring 13 is supported by the first baffle 4 and the second baffle 5.

Along the airflow flowing direction, the first guide plate 4 is located at the front side of the second guide plate 5, in this example, the front part of the first flow channel 2 is a circular flow channel, the second guide plate 5 is evenly distributed at the rear part of the first flow channel 2 in the circumferential direction, the second guide plate 5 guides the flow to form a flow channel, and finally the flow channel flows out through the second guide plate 5, as shown in fig. 4, it can be seen that the rear end of the second guide plate 5 is arranged to protrude backwards compared with the rear end of the isolation ring 13.

As shown in fig. 5, each first baffle 4 is arranged laterally offset with respect to the radial line 6, and the plane of the radial line 6 is the axial cross section, therefore, this technical feature can also be said to be arranged laterally offset with respect to the axial cross section. As can be seen from fig. 5, the first baffle 4, in which the radial line 6 indicated by a dotted line is located, has been deflected laterally to the left with respect to the radial line 6. The first air deflector 4 is not only transversely deflected relative to the radial line 6, but also the air inlet end of the first air deflector faces the air flow, as shown in fig. 23 and 24, in the figure, the air inlet end of the first air deflector 4 faces the flow channel between two adjacent fifth air deflectors 41, the air flow guided from the fifth air deflector 41 is guided by the first air deflector 4 and then enters the first flow channel 2, that is, the air inlet end of the first air deflector 4 is located between two adjacent fifth air deflectors 41.

The air inlet end of first guide plate 4 is equipped with the breach portion 7 that is located radial outside, 8 narrowing of linking department of the part of the radial inboard of breach portion 7 and air inlet end link up, aforementioned structure not only can break up the air current, avoid forming the vortex, thereby more be favorable to making an uproar, and owing to set up to breach portion 7, so first guide plate 4 matches the back with fifth guide plate 41, do not have the part that stretches out to the runner between the two adjacent fifth guide plates 41, avoided the runner between the two adjacent fifth guide plates 41 to a certain extent, be favorable to the air current to follow the runner outflow between the two adjacent fifth guide plates 41, also be favorable to the water conservancy diversion of follow-up first guide plate 4 to the air current, be favorable to the lifting efficiency on the one hand, on the other hand is favorable to making an uproar. In addition, because the setting of breach portion 7, the air inlet end that is favorable to first guide plate 4 can be close to the runner between the two adjacent fifth guide plates 41 more, so be favorable to shortening the water conservancy diversion route, the water conservancy diversion links up smoothly, is favorable to the raising efficiency on the one hand, and on the other hand is favorable to making an uproar to fall.

For better water conservancy diversion, fall make an uproar, the left and right sides face 9 of first guide plate 4 links up through first water conservancy diversion curved surface 10 with the both sides of breach portion 7, the terminal surface of the radial inboard part of air inlet end for being the second water conservancy diversion curved surface 11 that the straight line was arranged, the both sides of this second water conservancy diversion curved surface 11 link up with the left and right sides face 9 of first guide plate 4, breach portion 7 adopts arc breach portion 7, the air-out end of first guide plate 4 is concave yield structure, concave yield structure is equipped with third water conservancy diversion curved surface 12, the both sides of this third water conservancy diversion curved surface 12 link up with the left and right sides face 9 of first guide plate 4, concave yield structure adopts arc concave yield structure.

In order to effectively utilize the space and facilitate the compact structure, the front end of the first flow channel 2 is provided with a bearing seat 14 for mounting a rotating shaft 35 of the motor, and a first flow guide plate 4 is arranged between the bearing seat 14 and the isolating ring 13, in this example, the radial inner end of the first flow guide plate 4 is connected with the outer peripheral wall of the bearing seat 14, and the radial outer end of the first flow guide plate 4 is connected with the front end of the isolating ring 13, so that the front end of the isolating ring 13 is divided into a plurality of areas by the first flow guide plate 4 along the circumferential direction, and each area is provided with a fourth flow guide curved surface 15 for better flow guide and noise reduction.

Example two:

the second embodiment is different from the first embodiment in that an air chamber is arranged on the air inlet side penetrating through the cylinder body 1, a wind wheel 17 is arranged in the air chamber, an air inlet 18 is arranged at the front end of the air chamber, an air outlet is arranged at the rear end of the air chamber, and the air outlet is communicated with the first flow channel 2 and the second flow channel 3, and the specific structure is shown in fig. 11, 12, 13 and 14.

The wind chamber is enclosed by a wind cover 16 and a first wind guide wheel 19, the front end of the wind cover 16 is provided with an air inlet 18 as the air inlet 18 at the front end of the wind chamber, the first wind guide wheel 19 is provided with an air outlet, the air outlet is circumferentially arranged in the example, and air flow is guided out of the wind chamber through a fourth guide plate 40, so that the rotary air flow generated by the rotation of the wind wheel 17 can be better matched. The first air guiding wheel 19 is used for guiding the air flow to the first flow channel 2 and the second flow channel 3, specifically, a splitter plate, i.e., a fifth flow guiding plate 41, is arranged at the rear end of the fourth flow guiding plate 40, as shown in fig. 17, 18, 19, 23, and 24, after the air flow is guided by the fourth flow guiding plate 40, the air flow is guided and split by the flow channel between two adjacent fifth flow guiding plates 41, and as shown in the figure, the fifth flow guiding plate 41 is an arc-shaped plate as a whole. For better flow guidance, the axial height of the end section 42 of the fifth baffle 41 is set to a reduced level.

The middle part of first inducer 19 is equipped with the mating holes, and this mating holes cup joints the cooperation with bearing frame 14 and is connected, therefore compact structure, in addition, cup joints the cooperation with bearing frame 14 and is connected, regards bearing frame 14 as the installation benchmark, is favorable to ensureing the installation accuracy for first inducer 19 can be comparatively accurate with the air current direction to first runner 2 and second runner 3, like this, be favorable to raising the efficiency, noise reduction.

Example three:

embodiment three phases compare with embodiment one, the difference is that the second flow channel 3 is further provided with a second wind-guiding wheel 20, and the second wind-guiding wheel 20 is used for guiding the airflow to the flow channel inlet between each adjacent second flow channel 3 and then flowing out through the outlet of the second flow guiding plate 5, and the specific structure is shown in fig. 14, 15 and 16.

The improvement is that the second air guide wheel 20 is arranged in the circular flow channel of the first embodiment, so that the air flow guided from the first air guide wheel 19 is guided by the second air guide wheel 20 and then flows into the second guide plate 5, and the flow guiding effect is better.

The second wind guide wheel 20 is composed of an inner ring and an outer ring and a plurality of third guide plates 34 positioned between the inner ring and the outer ring, as shown in fig. 15, a complete third guide plate 34 is positioned in a rectangular frame drawn by dotted lines, as shown in fig. 14, the third guide plate 34 is positioned between two adjacent second guide plates 5, and the third guide plate 34 can be a circular arc-shaped guide plate.

The third embodiment can also combine the design of the wind chamber.

The third embodiment is also possible with other solutions, such as the second baffle 5 extending towards the inlet of the second flow channel 3, the extended part serving to direct the airflow towards the outlet of the second baffle 5, and the extended part may function similarly to the third baffle 34 as described.

Example four:

the fourth embodiment is a fan, and the specific structure is shown in fig. 6, 7, 8 and 9.

The fan comprises a motor and a wind wheel 17, the wind guiding structure is connected with the motor, part or all of the motor is inserted into the first flow passage 2, in this case, a stator 21 of the motor is already basically inserted into the first flow passage 2. The first guide plate 4 is positioned between the wind wheel 17 and the motor, a rotating shaft 35 of the motor is connected with the wind wheel 17, and the motor is used for driving the wind wheel 17 to rotate to generate airflow.

In this embodiment, as shown in fig. 6, 7 and 8, the motor includes a stator 21 and a rotor 37, and further includes a rotating shaft 35, a bearing 36, a front stator frame 22, a rear stator frame 23, a terminal block 24, and an electrical connection terminal 25, the rear stator frame 23 is provided with the terminal block 24, the terminal block 24 is used for inserting and installing the electrical connection terminal 25, the stator 21 is provided with a stator through hole 38, the front stator frame 22 and the rear stator frame 23 are both provided with a stator fixing plate 39 engaging with the stator through hole 38, the stator fixing plate 39 of the front stator frame 22 and the stator fixing plate 39 of the rear stator frame 23 engage with the stator through hole 38 to form a module as shown in fig. 7, and then the module is inserted into the first flow channel 2, the isolating ring 13 is inserted, so that the air guide structure is connected with the motor, and the air flow guided from the first guide plate 4 is mainly guided out through the stator through hole 38. The number of the stator through holes 38 is three, and the stator through holes are uniformly distributed along the circumferential direction, and correspondingly, the stator front support 22 and the stator rear support 23 are respectively provided with three stator fixing plates 39.

Example five:

fifth embodiment compares with fourth embodiment, and the difference lies in, the motor includes rear bracket 26, and this rear bracket 26 is connected with penetrating barrel 1 and coaxial setting, has solved the support problem of motor rear end, and the specific structure is shown in fig. 20, 21, 22.

The rear bracket 26 includes an air guiding ring 27 and a plurality of connecting seats 28 arranged along the circumferential direction, the air guiding ring 27 and the connecting seats 28 are both provided with a flow guiding curved surface 29, in this example, three connecting seats 28 are provided, and a flow passage corresponding to the stator through hole 38 is provided between adjacent connecting seats 28 for guiding out the air flow of the first flow passage 2.

In this example, the rear bracket 26 is connected to the spacer 13 and is coaxially disposed.

For better fixing of the motor and convenient installation, and the structure needs to be compact, three first mounting surfaces 30 are circumferentially arranged at the inner bottom of the isolation ring 13, the first mounting surfaces 30 are provided with threaded holes 32, and the connecting seats 28 are provided with corresponding second mounting surfaces 31 and connecting holes 33, so that the structure shown in fig. 20 is formed after the rear support 26 is connected with the isolation ring 13, the space between the first mounting surfaces 30 and the second mounting surfaces 31 is used for fixing the stator 21, and the structure shown in fig. 21 is formed after the stator 21 is fixed. The mounting sequence may be such that the module shown in fig. 7 is inserted into the spacer 13, the rear bracket 26 is then connected to the spacer 13, and the screws are screwed to complete the fixing connection.

For better flow guiding and noise reduction, the air guiding ring 27 and the connecting seat 28 are both provided with flow guiding curved surfaces 29, and the flow guiding curved surfaces 29 are arranged on the inner side surface and the outer side surface of the air guiding ring 27 and the connecting seat 28, as shown in fig. 22.

In the drawings, when one guide surface is composed of a plurality of surfaces, the transition line between the adjacent surfaces is a schematic effect, and actually, the adjacent surfaces are in smooth transition without obvious boundary lines.

For the sake of simplicity of illustration, reference numerals are given to parts already numbered in fig. 1 to 5, and not to all of the other figures, and when referring to the relevant structures of fig. 1 to 5, can be understood with reference to the reference numerals of fig. 1 to 5.

The utility model relates to a water conservancy diversion structure or fan not only are applicable to the dust catcher, also are applicable to other electrical apparatus that need water conservancy diversion structure or fan etc..

The above is only the illustration of the present invention, so all the equivalent changes or modifications made by the structure, features and principle according to the claims of the present invention are included in the claims of the present invention.

Claims (18)

1. The utility model provides an air guide structure, is including being used for the through cylinder (1) of wind-guiding, its characterized in that, through cylinder (1) in radially being divided into inside and outside two runners that separate each other, be first runner (2) and second runner (3) respectively, first runner (2) are inboard, second runner (3) are in the outside, first runner (2) entry is equipped with a plurality of first guide plates (4) along circumference, second runner (3) export is equipped with a plurality of second guide plates (5) along circumference.

2. The air guide structure as recited in claim 1, characterized in that each first air deflector (4) is transversely disposed in a deflecting manner with respect to the radial line (6), and the air inlet end of the first air deflector (4) faces the air flow.

3. The air guide structure according to claim 1, wherein the air inlet end of the first air deflector (4) is provided with a notch portion (7) located on the radial outer side, and the notch portion (7) is narrowed and connected with a connecting portion (8) of the portion on the radial inner side of the air inlet end.

4. The air guide structure according to claim 3, wherein the left and right side surfaces (9) of the first air guide plate (4) are connected to the two sides of the notch portion (7) via a first air guide curved surface (10).

5. The air guide structure according to claim 3, wherein the end surface of the radially inner portion of the air inlet end is a second flow guiding curved surface (11) arranged in a straight line shape, and both sides of the second flow guiding curved surface (11) are connected with both left and right side surfaces (9) of the first flow guiding plate (4).

6. The air guide structure according to claim 3, wherein the cutout portion (7) is an arc-shaped cutout portion (7).

7. The air guide structure according to claim 1 or 4, wherein the air outlet end of the first air guide plate (4) is a concave structure, the concave structure is provided with a third air guide curved surface (12), and two sides of the third air guide curved surface (12) are connected with the left side surface and the right side surface (9) of the first air guide plate (4).

8. The air guide structure of claim 7, wherein the concave structure is an arc concave structure.

9. The air guide structure according to claim 1, characterized in that the first air guide plate (4) is located on the front side of the second air guide plate (5) in the airflow flowing direction.

10. The air guide structure according to claim 1 or 9, wherein the first flow channel (2) and the second flow channel (3) are separated by a spacer ring (13), the first air deflector (4) is arranged at the front end of the spacer ring (13), and the second air deflector (5) is arranged between the spacer ring (13) and the through cylinder (1).

11. The air guide structure according to claim 10, wherein a bearing seat (14) for mounting a rotating shaft of the motor is arranged at the front end of the first flow channel (2), and the first flow guide plate (4) is arranged between the bearing seat (14) and the isolation ring (13).

12. The air guide structure as recited in claim 10, characterized in that the front end of the spacer ring (13) is divided into a plurality of areas by the first air deflector (4) along the circumferential direction, and each area is provided with a fourth curved air guide surface (15).

13. The air guide structure according to claim 1, wherein an air chamber is arranged through the air inlet side of the barrel body (1), an air wheel (17) is arranged in the air chamber, an air inlet (18) is arranged at the front end of the air chamber, an air outlet is arranged at the rear end of the air chamber, and the air outlet is communicated with the first flow channel (2) and the second flow channel (3).

14. The air guide structure according to claim 13, characterized in that a first air guide wheel (19) is adopted at the rear end of the air chamber, and the first air guide wheel (19) is used for guiding the air flow to the first flow passage (2) and the second flow passage (3).

15. The air guiding structure as recited in claim 1, characterized in that the second air guiding plate (5) extends towards the inlet of the second flow channel (3) and the extended portion is used for guiding the air flow to the outlet of the second air guiding plate (5), or the second flow channel (3) is further provided with a second air guiding wheel (20), and the second air guiding wheel (20) is used for guiding the air flow to the inlet of the flow channel between each adjacent second flow channel (3) and then flows out through the outlet of the second air guiding plate (5).

16. A fan, which adopts the wind guiding structure of any one of claims 1 to 15, and comprises a motor and a wind wheel (17), wherein the wind guiding structure is connected with the motor, part or all of the motor is inserted into the first flow channel (2), the first flow guiding plate (4) is positioned between the wind wheel (17) and the motor, the rotating shaft of the motor is connected with the wind wheel (17), and the motor is used for driving the wind wheel (17) to rotate to generate airflow.

17. The fan according to claim 16, characterised in that the motor comprises a rear bracket (26), the rear bracket (26) being connected to the through cylinder (1) and being arranged coaxially.

18. The fan according to claim 17, wherein the rear bracket (26) comprises an air guide ring (27) and a plurality of connecting seats (28) arranged along the circumferential direction, and the air guide ring (27) and the connecting seats (28) are provided with flow guide curved surfaces (29).

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