Double-section blade type fan imitating dragonfly wings

Abstract

The utility model provides an imitated dragonfly wing double-section blade type fan which comprises a cover body and an impeller, the cover body is provided with an air inlet and an air outlet which are oppositely arranged, the cover body is provided with a containing cavity in the direction from the air inlet to the air outlet, the impeller is arranged in the containing cavity, imitated dragonfly wing blades are evenly distributed on the outer surface of the impeller in the circumferential direction, and the imitated dragonfly wing blades are arranged in the containing cavity. The imitated dragonfly wing blades are in an arc strip shape and are bent in the first direction relative to the outer surface of the impeller, the first direction is clockwise or anticlockwise, the imitated dragonfly wing blades are provided with a plurality of sunken parts, and the sunken parts are sequentially arranged in the extending direction of the imitated dragonfly wing blades in an up-down staggered mode. The impeller is driven by the driving part to rotate, and the rotating direction of the impeller is opposite to the bending direction of the dragonfly-imitating wing blades. According to the utility model, the dragonfly wings are combined with the existing fan blades to simulate the state of the dragonfly wings in the take-off process, so that the wind area is enlarged, the noise is reduced, the stability is improved, the flow guide effect is enhanced, and the air blowing is more efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, and particularly relates to a double-section blade type fan imitating dragonfly wings. Background Art

[0002] Traditional fans mostly adopt blades with conventional shapes or simple geometric configurations. Although these designs have certain effects in improving the air volume or air pressure, there is still great room for improvement in the wind receiving area, noise control, and flow guiding. In nature, dragonflies are famous for their efficient flight ability. Their wings can generate strong lift and propulsion forces when vibrating, while maintaining extremely low noise. However, there is currently no fan that combines the dragonfly wing structure with the blades. Content of the Utility Model

[0003] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a double-section blade type fan imitating dragonfly wings, which combines the dragonfly wings with the existing fan blades. The blades are simplified from different cross-sections of the dragonfly wing wings to simulate the state of the dragonfly wing wings during the take-off process, which can increase the wind receiving area of the fan blades, reduce noise, and enhance the flow guiding effect, making the air blowing more efficient.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0005] A double-section blade type fan imitating dragonfly wings, comprising:

[0006] A housing, the housing having an air inlet and an air outlet arranged oppositely; along the direction from the air inlet to the air outlet, the housing has a receiving cavity;

[0007] An impeller, the impeller being arranged in the receiving cavity, the outer surface of the impeller being circumferentially and uniformly distributed with dragonfly-wing-like blades. The dragonfly-wing-like blades are in an arc-shaped strip shape and bend towards a first direction relative to the outer surface of the impeller. The first direction is the clockwise direction or the counterclockwise direction. The dragonfly-wing-like blades have a plurality of recessed parts, and the plurality of recessed parts are arranged in sequence along the extending direction of the dragonfly-wing-like blades and are arranged in a staggered manner up and down. The impeller is driven to rotate by a driving member, and the rotation direction of the impeller is opposite to the bending direction of the dragonfly-wing-like blades.

[0008] Furthermore, the receiving cavity is a cylindrical cavity structure and is coaxially arranged with the impeller, and the housing is a cylindrical shell structure and is coaxially arranged with the impeller.

[0009] Further, the impeller includes a rotating shaft and a rotating cylinder fixed to the rotating shaft. The rotating cylinder includes a first rotating plate, a second rotating plate, and a cylindrical barrel. The cylindrical barrel has a trumpet-shaped cylindrical structure. The first rotating plate is fixed to one end of the cylindrical barrel, and the second rotating plate is fixed to the other end of the cylindrical barrel, so that the first rotating plate, the second rotating plate, and the cylindrical barrel enclose a hollow cavity. The diameter of the first rotating plate is larger than that of the second rotating plate. The first rotating plate is away from the driving member, and the second rotating plate is close to the driving member. The rotating shaft is driven to rotate by the driving member, and the rotating shaft is fixed to the first rotating plate and / or the second rotating plate.

[0010] Further, a first hole is formed in the middle of the first rotating plate, and a second hole is formed in the middle of the second rotating plate. The rotating shaft sequentially passes through the second hole and the first hole, and the rotating shaft is fixedly connected to the second rotating plate by a key.

[0011] Further, the first rotating plate has at least one mounting opening, and the mounting opening communicates with the hollow cavity along the direction pointing from the mounting opening to the second rotating plate.

[0012] Further, a net cover is also included. The net cover is arranged at the air outlet, and the cover body is fixedly connected to the net cover.

[0013] Further, a through hole is formed in the middle of the net cover, and a bearing is arranged in the through hole. The rotating shaft passes through the bearing so that the rotating shaft is rotatably connected to the net cover. An end cover is fixed to the side of the net cover away from the impeller. The end cover has a blind hole, and the end of the rotating shaft is arranged in the blind hole and the end of the rotating shaft has a clearance fit with the blind hole.

[0014] Further, a bracket is also included. The bracket is fixed to the accommodating cavity, and the driving member is fixed to the bracket.

[0015] Further, the dragonfly-wing-like blade includes a front wing and a rear wing. Both the front wing and the rear wing are arc-shaped. There is a phase difference of 10° to 20° between the front wing and the rear wing so that the rotation of the rear wing lags behind that of the front wing. The front wing includes a first wing rib and a second wing rib connected to the first wing rib. A plurality of recessed portions are provided on the first wing rib, and the surface of the second wing rib is smooth. The first wing rib is close to the driving member, and the second wing rib is away from the driving member relative to the first wing rib. The rear wing includes a third wing rib connected to the second wing rib and a fourth wing rib connected to the third wing rib. The third wing rib is close to the driving member, and the fourth wing rib is away from the driving member relative to the third wing rib. A plurality of recessed portions are provided on the third wing rib, and the surface of the fourth wing rib is smooth. The third wing rib is close to the driving member, and the fourth wing rib is away from the driving member relative to the third wing rib. The front wing is close to the air inlet, and the rear wing is close to the air outlet.

[0016] Further, an exhaust hood is provided at the air outlet. The exhaust hood includes a first end portion and a second end portion. The inner diameter of the second end portion is larger than that of the first end portion, and the first end portion is fixed to the hood body;

[0017] An air guiding hood is provided at the air inlet. The air guiding hood includes a third end portion and a fourth end portion. The inner diameter of the third end portion is larger than that of the fourth end portion, and the fourth end portion is fixed to the hood body.

[0018] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0019] A dragonfly-wing-like double-section blade type fan provided by the present utility model has an impeller driven by a driving member to rotate in the accommodation cavity of the hood body, and the rotation direction of the impeller is opposite to the bending direction of the dragonfly-wing-like blade, so that air enters from the air inlet and converges and discharges from the air outlet. The fan utilizes bionics to enhance the stability while ensuring the air flow intensity when the blade rotates with the impeller.

[0020] In addition, in the present utility model, the dragonfly-wing-like blade has a plurality of recessed portions. The plurality of recessed portions are arranged in sequence along the extending direction of the dragonfly-wing-like blade and are staggered up and down to form a blade with a folded structure, which can more effectively disperse stress, reduce the risk of damage that may be caused by stress concentration, and improve the durability of the blade; the folded structure also enables the blade to have a stronger ability to resist radial bending deformation, so as to maintain a stable shape and performance; and the folded structure can enable the blade to have a stronger flow guiding ability, reduce the generation of turbulent flow, and reduce the air flow resistance.

[0021] The present utility model has significant advantages in aspects such as improving energy efficiency, reducing noise, enhancing stability, and optimizing the flow guiding ability, and has a broad market application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are provided to further understand the present utility model and form a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0023] Figure 1 is a schematic diagram of the overall structure of the first angle of the present utility model;

[0024] Figure 2 is a schematic diagram of the overall structure of the second angle of the present utility model;

[0025] Figure 3 is a schematic diagram of the overall structure of the driving member and the impeller of the first angle of the present utility model;

[0026] Figure 4 is a schematic diagram of the overall structure of the driving member and the impeller of the second angle of the present utility model;

[0027] Figure 5 is a right view of the driving member and the impeller of the present utility model;

[0028] Figure 6 is a schematic diagram of the overall structure of the first angle of the impeller of the present utility model;

[0029] Figure 7 is a schematic diagram of the overall structure of the second angle of the impeller of the present utility model;

[0030] Figure 8 is a front view of the wire mesh cover of the present utility model;

[0031] Figure 9 is a schematic diagram of the structure of the cover plate of the present utility model;

[0032] Figure 10 is a schematic diagram of the structure of the end cover of the present utility model;

[0033] Figure 11 is a schematic diagram of the structure of the dragonfly-wing-like blade of the present utility model.

[0034] Among them, 1. housing; 11. air inlet; 12. air outlet; 13. accommodating cavity; 2. impeller; 21. rotating shaft; 22. rotating cylinder; 221. first rotating plate; 2211. mounting opening; 2212. first hole; 222. second rotating plate; 2221. second hole; 223. cylinder; 23. hollow cavity; 3. dragonfly-wing-like blade; 31. front wing; 311. recessed part; 312. first wing rib; 313. second wing rib; 32. rear wing; 321. third wing rib; 322. fourth wing rib; 4. base; 5. wire mesh cover; 51. through hole; 6. end cover; 61. blind hole; 7. air guiding cover; 71. third end; 72. fourth end; 8. exhaust hood; 81. first end; 82. second end; 9. driving member; 10. support plate; 110. cover plate; 111. third hole; 112. key. Detailed implementation manner

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] This embodiment provides a dragonfly-wing-like double-section blade type fan, as Figures 1-3 shown in the figure, including a housing 1 and an impeller 2.

[0038] The housing 1 has an air inlet 11 and an air outlet 12 arranged opposite to each other; along the direction from the air inlet 11 to the air outlet 12, the housing 1 has an accommodating cavity 13;

[0039] The impeller 2 is arranged in the accommodation cavity 13. The outer surface of the impeller 2 is circumferentially and evenly distributed with dragonfly-wing-like blades 3. The dragonfly-wing-like blades 3 are arc-shaped strips and are bent relative to the outer surface of the impeller 2 in a first direction. The first direction is the clockwise direction or the counterclockwise direction. The dragonfly-wing-like blades 3 have a plurality of recessed portions 311. The recessed portions 311 are grooves. The plurality of recessed portions 311 are arranged in sequence along the extending direction of the dragonfly-wing-like blades 3 and are arranged in a staggered manner up and down. The impeller 2 is driven to rotate by a driving member 9, and the rotation direction of the impeller 2 is opposite to the bending direction of the dragonfly-wing-like blades 3.

[0040] In a dragonfly-wing-like double-section blade type fan provided in this embodiment, the impeller 2 is driven by a driving member 9 to rotate in the accommodation cavity 13 of the housing 1, and the rotation direction of the impeller 2 is opposite to the bending direction of the dragonfly-wing-like blades 3, so that the air enters from the air inlet 11 and converges and discharges from the air outlet 12. This fan borrows from bionics and generates stronger airflows when the blades rotate with the impeller 2 by imitating the state of the dragonfly's wings when taking off.

[0041] In addition, in this embodiment, the dragonfly-wing-like blades 3 have a plurality of recessed portions 311. The plurality of recessed portions 311 are arranged in sequence along the extending direction of the dragonfly-wing-like blades 3 and are arranged in a staggered manner up and down, forming a blade with a wrinkled structure. This can more effectively disperse stress, reduce the risk of damage that may be caused by stress concentration, and improve the durability of the blades; the wrinkled structure also enables the blades to have a stronger ability to resist radial bending deformation, so as to maintain a stable shape and performance; and the wrinkled structure can enable the blades to have a stronger flow guiding ability, reduce the generation of turbulent flow, and reduce the air flow resistance.

[0042] This embodiment has significant advantages in aspects such as improving energy efficiency, reducing noise, enhancing stability, and optimizing the flow guiding ability, and has broad market application prospects.

[0043] In this embodiment, when the plurality of dragonfly-wing-like blades 3 are bent relative to the outer surface of the impeller 2 in the clockwise direction, the impeller 2 is driven by the driving member 9 to rotate counterclockwise; when the plurality of dragonfly-wing-like blades 3 are bent relative to the outer surface of the impeller 2 in the counterclockwise direction, the impeller 2 is driven by the driving member 9 to rotate clockwise.

[0044] In this embodiment, as Figure 1 and Figure 2 shown, in order to facilitate the placement of the housing 1, a base 4 is provided at the bottom of the housing 1. The base 4 is detachably connected, fixedly connected or integrally formed with the housing 1. This embodiment does not make a limitation on this.

[0045] In this embodiment, in order to ensure that the air can enter and exit directly and can be discharged with the maximum intensity, the accommodation cavity 13 is a cylindrical cavity structure and is coaxially arranged with the impeller 2.

[0046] In this embodiment, the cover 1 is a cylindrical shell structure and is coaxially arranged with the impeller 2.

[0047] In this embodiment, as Figures 3-7 shown, in order to achieve a better wind gathering effect, the impeller 2 includes a rotating shaft 21 and a rotating cylinder 22 fixed to the rotating shaft 21. The rotating cylinder 22 includes a first rotating plate 221, a second rotating plate 222, and a cylindrical tube 223. The cylindrical tube 223 has a trumpet-shaped tubular structure. The first rotating plate 221 is fixed to one end of the cylindrical tube 223, and the second rotating plate 222 is fixed to the second end of the cylindrical tube 223, so that the first rotating plate 221, the second rotating plate 222, and the cylindrical tube 223 enclose a hollow cavity 23. The diameter of the first rotating plate 221 is larger than that of the second rotating plate 222. The first rotating plate 221 is away from the driving member 9, and the second rotating plate 222 is close to the driving member 9. The rotating shaft 21 is driven to rotate by the driving member 9, and the rotating shaft 21 is fixed to the first rotating plate 221 and / or the second rotating plate 222.

[0048] Specifically, as Figure 6 and Figure 7 shown, the first rotating plate 221 is provided with a first hole 2212, and the second rotating plate 222 is provided with a second hole 2221. The rotating shaft 21 sequentially passes through the second hole 2221 and the first hole 2212, and the rotating shaft 21 is fixedly connected to the second rotating plate 222 through a key 112.

[0049] When the rotating shaft 21 is also fixed to the first rotating plate 221, the rotating shaft 21 is threadedly connected to the first rotating plate 221. The rotating shaft 21 is provided with a first external thread, and the inner wall of the first hole 2212 is provided with a first internal thread that mates with the first external thread.

[0050] In addition, as Figure 3 and Figure 9 shown, when the rotating shaft 21 is not fixedly connected to the first rotating plate 221, in order to prevent the impeller 2 from gradually moving away from the driving member 9 during rotation, it further includes a cover plate 110. The cover plate 110 is provided with a third hole 111 that penetrates through the cover plate 110. The cover plate 110 is arranged on the side of the first rotating plate 221 away from the second rotating plate 222. The rotating shaft 21 passes through the third hole 111, that is, the rotating shaft 21 sequentially passes through the second hole 2221, the first hole 2212, and the third hole 111 in the direction away from the driving member 9. The rotating shaft 21 is provided with a second external thread, and the inner wall of the third hole 111 is provided with a second internal thread that mates with the second external thread.

[0051] In this embodiment, as Figure 3 shown, in order to reduce the weight of the impeller 2 and facilitate the installation of the impeller 2 on the driving member 9, the first rotating plate 221 has at least one mounting opening 2211, and the mounting opening 2211 communicates with the hollow cavity 23 along the direction pointing from the mounting opening 2211 to the second rotating plate 222.

[0052] In this embodiment, as Figure 4 shown, the second rotating plate 222 is thickened to reduce vibration. The blower device has better flow guiding effect and lower vibration noise.

[0053] Specifically, in this embodiment, as Figure 3 shown, the installation opening 2211 is fan-shaped, and the installation opening 2211 communicates with the hollow cavity 23, so that the impeller 2 is in a hollow design. A plurality of installation openings 2211 are symmetrically distributed relative to the axis center of the impeller 2 on the second rotating plate 222. Both the first rotating plate 221 and the second rotating plate 222 are plate-like structures, so that the impeller 2 is in a hollow frustum structure.

[0054] In this embodiment, as Figure 1 shown, for the convenience of heat dissipation and air exhaust, a net cover 5 is further included. The net cover 5 is arranged at the air outlet 12. The net cover 5 is detachably connected, fixedly connected or integrally formed with the cover body 1, and this embodiment does not limit this. In the specific implementation manner of this embodiment, the net cover 5 is fixedly connected to the cover body 1 by bolts.

[0055] Specifically, as Figure 1 shown, the impeller 2 is rotatably connected to the net cover 5. One end of the rotating shaft 21 is fixedly connected to the output shaft of the driving member 9, and the other end is rotatably connected to the net cover 5.

[0056] In the embodiment of the present utility model, as Figure 1 , Figure 3 and Figure 10 shown, an end cover 6 is fixed on the net cover 5. The middle part of the end cover 6 has a blind hole 61. The blind hole 61 is rotatably connected to the rotating shaft 21. The end part of the rotating shaft 21 is arranged in the blind hole 61 and the end part of the rotating shaft 21 has a clearance fit with the end cover 6. In order to make the rotating shaft 21 rotate smoothly in the end cover 6, the net cover 5 has a through hole 51. A bearing 120 is arranged in the through hole 51. The outer ring of the bearing 120 is fixed to the inner wall of the through hole 51 by bolts. The bearing 120 is sleeved on the rotating shaft 21. The end cover 6 is fixed to the net cover 5 by bolts.

[0057] In this embodiment, the rotating shaft 21 includes a first shaft and a second shaft integrally formed. The diameter of the first shaft is larger than that of the second shaft. One end of the first shaft is fixed to the output shaft of the driving member 9, and the other end of the first shaft is connected to one end of the second shaft. The other end of the second shaft is arranged in the blind hole 61.

[0058] The first rotating plate 221 is fixedly connected to the first shaft by a key 112, and the second rotating plate 222 or the cover plate 110 is threadedly connected to the second shaft.

[0059] In this embodiment, as Figure 10As shown, it further includes a bracket which is fixed to the accommodation cavity 13, and the driving member 9 is fixed to the bracket.

[0060] In this embodiment, the bracket can be of any structure, as long as it can ensure that the driving member 9 is fixed and the driving member 9 is arranged on the axis of the accommodation cavity 13. This embodiment does not make any limitation in this regard.

[0061] In the specific implementation manner of this embodiment, as Figure 10 shown, the bracket includes a plurality of support plates 10. The plurality of support plates 10 are all arranged radially along the accommodation cavity 13 and adjacent support plates 10 are spaced apart by a certain distance. One end of the support plate 10 is fixed to the outer wall of the accommodation cavity 13, and the other end of the support plate 10 is fixed to the driving member 9.

[0062] In this embodiment, as Figures 3-7 shown, the dragonfly wing-like blade 3 includes a front wing 31 and a rear wing 32. Both the front wing 31 and the rear wing 32 are arc-shaped, and there is a phase difference of 10° to 20° between the front wing 31 and the rear wing 32 so that the rotation of the rear wing 32 lags behind that of the front wing 31. The front wing 31 is close to the air inlet 11, and the rear wing 32 is close to the air outlet 12, so that the air is discharged smoothly through the surface of the rear wing 32 after being processed by the corrugated structure.

[0063] Specifically, as Figures 3-7 and Figure 10 shown, the front wing 31 includes a first wing strip 312 and a second wing strip 313 connected to the first wing strip 312. A plurality of recessed portions 311 are provided on the first wing strip 312, the surface of the second wing strip 313 is smooth, the first wing strip 312 is close to the driving member 9, and the second wing strip 313 is farther from the driving member 9 than the first wing strip 312. The rear wing 32 includes a third wing strip 321 connected to the second wing strip 313 and a fourth wing strip 322 connected to the third wing strip 321. The third wing strip 321 is close to the driving member 9, the fourth wing strip 322 is farther from the driving member 9 than the third wing strip 321. A plurality of recessed portions 311 are provided on the third wing strip 321, the surface of the fourth wing strip 322 is smooth, the third wing strip 321 is close to the driving member 9, and the fourth wing strip 322 is farther from the driving member 9 than the third wing strip 321.

[0064] In this embodiment, the dragonfly wing-like blade 3 is detachably connected, fixedly connected or integrally formed with the impeller 2.

[0065] In this embodiment, as Figure 1 and Figure 2 shown, an air guide hood 7 is provided at the air inlet 11, and an exhaust hood 8 is provided at the air outlet. By providing the air guide hood 7 and the exhaust hood 8, the air can be introduced and discharged better. The air guide hood 7 is detachably connected, fixedly connected or integrally formed with the housing 1, and the exhaust hood 8 is detachably connected, fixedly connected or integrally formed with the housing 1. This embodiment does not make any limitation in this regard.

[0066] Specifically, as Figure 1 and Figure 2 shown, in the specific embodiment of the present utility model, the exhaust hood 8 and the hood body 1 are integrally formed, and the air guiding hood 7 and the hood body 1 are integrally formed. Both the exhaust hood 8 and the air guiding hood 7 are frustum-shaped cavity structures. The exhaust hood 8 includes a first end 81 and a second end 82, the inner diameter of the second end 82 is greater than that of the first end 81, and the first end 81 is fixed to the hood body 1. The air guiding hood 7 includes a third end 71 and a fourth end 72, the inner diameter of the third end 71 is greater than that of the fourth end 72, and the fourth end 72 is fixed to the hood body 1.

[0067] In this embodiment, the driving member 9 is a motor, the rear part of the motor is connected with a wire, and the wire is connected with the control circuit.

[0068] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these changes and modifications.

Claims

1. A double-section blade fan imitating dragonfly wings, characterized in that: include: A cover body, wherein the cover body has an air inlet and an air outlet arranged opposite to each other; and the cover body has a receiving cavity along the direction from the air inlet to the air outlet; An impeller, wherein the impeller is arranged in the accommodating cavity, and the outer surface of the impeller is evenly distributed with dragonfly-like wing blades in the circumferential direction, and the dragonfly-like wing blades are in the shape of arc strips and are bent in a first direction relative to the outer surface of the impeller, and the first direction is clockwise or counterclockwise, and the dragonfly-like wing blades have a plurality of recessed portions, and the plurality of recessed portions are arranged in sequence along the extension direction of the dragonfly-like wing blades and are arranged alternately up and down, and the impeller is driven to rotate by a driving member and the rotation direction of the impeller is opposite to the bending direction of the dragonfly-like wing blades.

2. The dragonfly-like double-section blade fan according to claim 1 is characterized by: The accommodating cavity is a cylindrical cavity structure and is coaxially arranged with the impeller, and the cover body is a cylindrical shell structure and is coaxially arranged with the impeller.

3. The dragonfly-like double-section blade fan according to claim 1 is characterized by: The impeller includes a rotating shaft and a rotating cylinder fixed to the rotating shaft, the rotating cylinder includes a first rotating plate, a second rotating plate and a cylinder, the cylinder is a trumpet-shaped cylindrical structure, the first rotating plate is fixed to one end of the cylinder, and the second rotating plate is fixed to the other end of the cylinder, so that the first rotating plate, the second rotating plate and the cylinder enclose a hollow cavity, the diameter of the first rotating plate is greater than the diameter of the second rotating plate, the first rotating plate is far away from the driving member, the second rotating plate is close to the driving member, the rotating shaft is driven to rotate by the driving member, and the rotating shaft is fixed to the first rotating plate and / or the second rotating plate.

4. The dragonfly-like double-section blade fan according to claim 3 is characterized by: A first hole is opened in the middle of the first rotating plate, a second hole is opened in the middle of the second rotating plate, the rotating shaft passes through the second hole and the first hole in sequence, and the rotating shaft is fixedly connected to the second rotating plate by a key.

5. The dragonfly-like double-section blade fan according to claim 3 is characterized by: The first rotating plate has at least one mounting opening, the mounting opening points in the direction of the second rotating plate, and the mounting opening is communicated with the hollow cavity.

6. The dragonfly-wing-like double-section blade fan according to claim 3 is characterized by: It also includes a mesh cover, which is arranged at the air outlet, and the cover body is fixedly connected to the mesh cover.

7. The dragonfly-like double-section blade fan according to claim 6, characterized in that: The mesh cover has a through hole in the middle, a bearing is arranged in the through hole, the rotating shaft passes through the bearing so that the rotating shaft and the mesh cover are rotatably connected, an end cover is fixed on the side of the mesh cover away from the impeller, the end cover has a blind hole, the end of the rotating shaft is arranged in the blind hole and the end of the rotating shaft is gap-matched with the blind hole.

8. The dragonfly-like double-section blade fan according to claim 1, characterized in that: It also includes a bracket, which is fixed to the accommodating cavity, and the driving member is fixed to the bracket.

9. The dragonfly-like double-section blade fan according to claim 1, characterized in that: The dragonfly-like wing blade includes a front wing and a rear wing, both of which are arc-shaped, and there is a phase difference of 10° to 20° between the front wing and the rear wing so that the rotation of the rear wing lags behind the front wing. The front wing includes a first wing bar and a second wing bar connected to the first wing bar, a plurality of recessed portions are arranged on the first wing bar, a surface of the second wing bar is smooth, the first wing bar is close to the driving member, and the second wing bar is far away from the driving member relative to the first wing bar, the rear wing includes a third wing bar connected to the second wing bar and a fourth wing bar connected to the third wing bar, a plurality of recessed portions are arranged on the third wing bar, a surface of the fourth wing bar is smooth, the third wing bar is close to the driving member, and the fourth wing bar is far away from the driving member relative to the third wing bar, the front wing is close to the air inlet, and the rear wing is close to the air outlet.

10. The dragonfly-like double-section blade fan according to claim 1, characterized in that: The air outlet is provided with an exhaust hood, the exhaust hood includes a first end and a second end, the inner diameter of the second end is larger than the inner diameter of the first end, and the first end is fixed to the hood body; The air inlet is provided with an air induced hood, and the air induced hood includes a third end and a fourth end, the inner diameter of the third end is greater than the inner diameter of the fourth end, and the fourth end is fixed to the hood body.

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