Blowing equipment

Abstract

The utility model discloses a blowing equipment relates to blowing equipment technical field, wherein the blowing equipment includes fan blade structure and fan body, fan blade structure includes first blade, second blade and coaxial outer hub and inner hub, outer hub is sleeved outside the outer hub of inner hub, first blade is connected to the outer hub of outer hub, second blade is connected to the outer hub of outer hub of outer hub, and fan body is connected to the outer hub of outer hub of outer hub of outer hub of outer hub of outer hub of outer hub of outer hub. The second blades are connected with the outer hub and the inner hub, the side, back on to the inner hub, of the outer wall of the outer hub is parallel to the air outlet direction, and the side, facing the inner hub, of the inner wall of the outer hub is inclined; the fan body is connected with the inner hub and used for driving the inner hub to rotate. Wherein the number of the first blades is different from that of the second blades. The inner wall of the outer hub is obliquely arranged, and the outer wall of the outer hub is parallel to the air outlet direction, so that a better air blowing effect is achieved. And meanwhile, the first blades and the second blades are inconsistent in number, so that resonance is reduced, and the stability and durability of the air blowing equipment are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a blowing equipment technical field, especially a blowing equipment. BACKGROUND

[0002] The blowing equipment is a kind of equipment for generating and controlling airflow, usually including fan and fan blade, fan blade is rotated using fan drive, and fan blade disturbance air in air outlet cavity forms air outlet airflow, realizes the stable blowing of blowing equipment.

[0003] The fan blade outer hub of the blowing equipment in prior art is mostly straight cylinder, when internal airflow is disturbed, it is easy to stick to the inner wall of outer hub, which affects air outlet wind power and air outlet effect. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a blowing equipment, to improve the structural design of blowing equipment, improve the air outlet effect of blowing equipment.

[0005] To achieve the above object, the utility model provides a blowing equipment, the blowing equipment includes:

[0006] Fan blade structure, the fan blade structure includes first blade, second blade and coaxially arranged outer hub and inner hub, the outer hub is sleeved on the outer periphery of the inner hub, the first blade is connected to the outer periphery of the outer hub, the second blade is connected to the outer hub and the inner hub, the outer wall of the outer hub is arranged in parallel with the side of the inner hub to the air outlet direction, and the inner wall of the outer hub is arranged in the side of the inner hub.

[0007] Fan body, the fan body is connected with the inner hub, and is used to drive the inner hub to rotate;

[0008] Wherein, the number of the first blade and the second blade is different.

[0009] In an embodiment, the number of the first blade is greater than the number of the second blade.

[0010] In an embodiment, the distance between the inner wall of the outer hub and the outer periphery of the inner hub gradually increases along the air outlet direction;

[0011] And / or, the second blade is inclined to the rotation center axis of the fan blade structure.

[0012] In an embodiment, the outer hub includes first guide wall and second guide wall connected, first blade is connected to the first guide wall, and second blade is connected to the second guide wall and inner hub;

[0013] The second guide wall is arranged obliquely, and an included angle is arranged between a side of the second guide wall facing the first guide wall and a side of the first guide wall facing the second guide wall.

[0014] In an embodiment, the second vane includes a first connecting section and a second connecting section, the first connecting section is connected with the second guide wall, and the second connecting section connects the first guide wall and the second guide wall.

[0015] In an embodiment, the first guide wall is arranged in an arc shape.

[0016] In an embodiment, the first guide wall and the second guide wall are an integral structure.

[0017] In an embodiment, the inner hub includes a first ring body and a second ring body connected with each other, the first ring body is connected with the second vane, the second ring body is arranged in an arc shape at a connection position of the first ring body, and abuts against the fan body.

[0018] In an embodiment, the second ring body is provided with a first through groove, the first through groove penetrates the second ring body, an end surface of the fan body abuts against the second ring body and is limited in the first through groove.

[0019] Alternatively, the second ring body is provided with a second through groove, the second through groove is provided with a mounting structure, and the mounting structure is connected with the fan body in a matched mode.

[0020] In an embodiment, the hair-drying device further includes a housing, the housing is provided with an air outlet channel, an air inlet and an air outlet which are communicated with each other, and the vane structure and the fan body are arranged in the air outlet channel.

[0021] The hair-drying device further includes an air inlet grille and an air outlet grille, the air inlet grille is connected with the housing and covers the air inlet, and the air outlet grille is connected with the housing and covers the air outlet.

[0022] In an embodiment, the housing further includes a guide table, the guide table is arranged at the air outlet and opposite to the second vane, and a wall surface of the guide table facing the vane structure is arranged obliquely.

[0023] The technical scheme of the utility model discloses the inner wall surface of outer wheel hub is inclined to the side of inner wheel hub, relative to the straight cylinder of outer wheel hub inner wall in traditional technology, the outer wheel hub inner wall of inclined setting can play good flow guiding effect, avoid the air flow under the action of second blade tightly close outer wheel hub inner wall, guarantee that second blade can better disturb airflow and blow, to realize better air outlet effect, meanwhile, the outer wall of outer wheel hub is parallel to the side of inner wheel hub and the air outlet direction, can reduce the complexity of fan in the processing process, reduce manufacturing cost and improve production efficiency, meanwhile, the number of first blade and the number of second blade are not consistent, reach reduce resonance, improve the stability and durability of blowing equipment. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description is only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, other drawings can also be obtained according to the structure shown in these drawings.

[0025] Figure 1 The structure schematic view of the blowing equipment one embodiment provided by the utility model is shown in the figure.

[0026] Figure 2 The sectional structure schematic view of the blowing equipment one embodiment provided by the utility model is shown in the figure.

[0027] Figure 3 The sectional structure schematic view of the blowing equipment one embodiment provided by the utility model is shown in the figure.

[0028] Figure 4 The structure schematic view of the fan blade structure one embodiment provided by the utility model is shown in the figure.

[0029] Figure 5 The structure schematic view of the fan blade structure one embodiment provided by the utility model is shown in the figure.

[0030] Figure 6 The structure schematic view of the fan blade structure one embodiment provided by the utility model is shown in the figure.

[0031] Explanation of the drawing reference numeral:

[0032] 1000, blowing equipment, 1, fan blade structure, 11, first blade, 12, second blade, 13, outer wheel hub, 131, first flow guide wall, 132, second flow guide wall, 14, inner wheel hub, 141, first ring body, 142, second ring body, 14a, first through slot, 14b, second through slot, 2, fan body, 3, shell, 31, air inlet grille, 32, air outlet grille, 33, flow guide table.

[0033] The purposes, functional features and advantages of the utility model will be further described in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the utility model.

[0035] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0036] In addition, if the embodiments of the utility model involve the description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one feature. In addition, if "and / or" or "and / or" appears in the whole text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0037] The utility model provides a kind of blowing equipment 1000.

[0038] Please refer to Figures 1 to 6In an embodiment of the utility model, this blowing equipment includes fan blade structure 1 and fan body 2, fan blade structure 1 includes first blade 11, second blade 12 and coaxial setting outer hub 13 and inner hub 14, outer hub 13 is set on the outer periphery of inner hub 14, first blade 11 is connected to the outer periphery of outer hub 13, second blade 12 connects outer hub 13 and inner hub 14, the outer wall of outer hub 13 is set up in parallel with the air outlet direction on the side of inner hub 14, and the inner wall of outer hub 13 is set up obliquely on the side of inner hub 14;Fan body 2 is connected with inner hub 14, and is used to drive inner hub 14 to rotate;Wherein, the number of first blade 11 and second blade 12 is different.

[0039] In the present embodiment, the blowing device can be applied to a fan, a hair dryer, and the like. It can be understood that the first blades 11 form an air inlet channel between the coaxially arranged outer hub 13 and inner hub 14, and a plurality of first blades 11 are arranged around the outer periphery of the outer hub 13, and a plurality of second blades 12 are arranged around the inner wall of the outer hub 13 and the outer wall of the inner hub 14 to connect the outer hub 13 and the inner hub 14, so that the first blades 11 adopt the fan blade structure 1 in the form of combined air outlet to better disturb the airflow. Accordingly, the first blades 11 can adopt axial flow blades, and the second blades 12 can adopt centrifugal blades, so as to increase the combined air outlet effect of the fan blade structure. The first blades 11, the second blades 12, the outer hub 13, and the inner hub 14 are connected in the form of injection molding. The outer wall of the outer hub 13 arranged on the side away from the inner hub 14 is parallel to the air outlet direction, so that the airflow can flow directly along the rotation direction of the fan blade, reducing the turbulence and energy loss of the airflow; at the same time, the vertically arranged outer wall can reduce the complexity of processing and reduce the production cost. The inner wall of the outer hub 13 arranged on the side facing the inner hub 14 is inclined, and the second blades 12 are connected to the inner hub 14. Since the second blades 12 adopt centrifugal blades to disturb the airflow, the airflow is subjected to a certain centrifugal force, so that the airflow can flow smoothly along the inclined surface, which is conducive to guiding the airflow to be discharged, so that the airflow can be discharged more easily, avoiding the airflow adhering to the inner wall of the outer hub to affect the air outlet volume of the fan blade structure, improving the airflow disturbance effect of the fan blade structure on the air outlet airflow. In addition, the inclined arrangement of the inner wall of the outer hub 13 allows the airflow to blow out of the air inlet channel obliquely, so that the airflow disturbed by the second blades 12 can more quickly meet the airflow disturbed by the first blades 11, realizing the rapid mixing of the two airflows, and further improving the flow rate of the mixed airflow generated by the first blades 11, and further improving the high-speed blowing effect of the blowing device. Further, the number of first blades 11 is different from the number of second blades 12, i.e., the number of first blades 11 can be greater than the number of second blades 12, or the number of first blades 11 can be less than the number of second blades 12. Due to the asymmetric blade layout, resonance is reduced, and the stability and durability of the blowing device are improved. The embodiment in which the number of first blades 11 is greater than the number of second blades 12 is described in the following embodiments.

[0040] Therefore, the inner wall of the outer wheel hub 13 is inclined and the outer wall is parallel to the air outlet direction, so as to achieve better blowing effect. The inner wall of the outer wheel hub 13 is inclined to the side of the inner wheel hub 14, compared with the straight cylinder of the inner wall of the outer wheel hub 13 in the conventional technology, the inclined inner wall of the outer wheel hub 13 can play a better flow guiding effect, so as to avoid the air flow adhering to the inner wall of the outer wheel hub under the action of the second blade 12, and to ensure that the second blade 12 can better disturb the air flow to achieve better air outlet effect. Meanwhile, the outer wall of the outer wheel hub 13 is parallel to the air outlet direction on the side away from the inner wheel hub, which can reduce the complexity of the fan in the processing process, reduce the manufacturing cost and improve the production efficiency. Meanwhile, the number of the first blade 11 is different from the number of the second blade 12, so as to reduce resonance, improve stability and durability of the blowing equipment.

[0041] In combination Figure 4 In an embodiment of the utility model, the number of the first blade 11 is greater than the number of the second blade 12.

[0042] In this embodiment, it can be understood that the number of the first blade 11 is greater than the number of the second blade 12, so that the outer end of the blade has stronger function, so that the outer ring wind speed of the fan blade is greater, which helps to improve the overall air volume and air pressure of the fan blade structure. By making the first blade 11 adopt axial flow blade and the second blade 12 adopt centrifugal blade, the air flow is more uniform, the air flow disorder and energy loss are reduced, and the efficiency and performance of the blowing equipment are improved.

[0043] In combination Figure 2 And Figure 3 In an embodiment of the utility model, the distance between the inner wall of the outer wheel hub 13 and the outer periphery of the inner wheel hub 14 gradually increases along the air outlet direction; and / or, the second blade 12 is inclined to the rotation center axis of the fan blade structure 1.

[0044] In the embodiment, it can be understood that the inner wall of the outer hub 13 is arranged in a gradually expanding horn structure along the air inlet direction by gradually increasing the spacing between the inner wall of the outer hub 13 and the outer periphery of the inner hub 14 along the air outlet direction, and the airflow is disturbed by the centrifugal blades of the second blades 12, so that the airflow is subjected to a certain centrifugal force, the airflow can flow smoothly along the inclined surface, the fan structure has a better guiding and exhausting effect on the airflow, the airflow can be easily exhausted, and the flow effect of the fan structure on the airflow is better improved. The second blades 12 are inclined to the rotation center axis of the fan structure 1, and correspondingly, the second blades 12 are centrifugal blades, the airflow generated by the centrifugal blades flows along the radial direction of the fan structure 1, the inclined arrangement of the second blades 12 can reduce the impact of the second blades 12 on the outer hub 13, and the outer hub 13 can guide the airflow generated by the second blades 12 obliquely, so that the airflow is more easily exhausted from between the inner hub 14 and the outer hub 13, and turbulence or noise is avoided between the outer hub 13 and the inner hub 14; further, the airflow generated by the second blades 12 is obliquely exhausted, the airflow generated by the first blades 11 flows axially, the airflow generated by the two can be quickly mixed, and the flow rate of the mixed airflow can be increased under the pushing of the airflow generated by the second blades 12.

[0045] In combination Figure 2 and Figure 3 In an embodiment of the utility model, the outer hub 13 includes the first flow guide wall 131 and the second flow guide wall 132 connected, the first blades 11 are connected to the first flow guide wall 131, the second blades 12 are connected to the second flow guide wall 132 and the inner hub 14, the second flow guide wall 132 is arranged obliquely, and the side of the first flow guide wall 131 facing the second flow guide wall 132 and the side of the second flow guide wall 132 facing the first flow guide wall 131 are arranged at an angle.

[0046] In the embodiment, the first guide wall 131 and the second guide wall 132 are used to achieve the guiding effect. It can be understood that after the air enters the air inlet flow channel in the fan blade structure 1, the air is disturbed by the second hub 14 and the second blade 12, and under the action of the disturbance of the second blade 12, the second guide wall 132 is inclined, so that the air flow is subjected to a centrifugal force between the second guide wall 132 and the inner hub 14, so that the air flow flows along the inclined surface of the second guide wall 132. The air flow generated by the second blade 12 is obliquely blown out along the inclined surface of the second guide wall 132 to achieve the guiding and exhausting effect of the air flow, and to reduce the turbulence or noise generated by the air flow. At the same time, the air flow can be obliquely blown out of the air inlet flow channel in the fan blade structure 1 under the action of the inclined arrangement of the second guide wall 132, so that the air flow disturbed by the second blade 12 can better intersect with the air flow disturbed by the first blade 11, to improve the high-speed blowing effect of the blowing effect. Further, the outer hub 13 adopts the arrangement mode of the first guide wall 131 and the second guide wall 132, which can reduce the complexity of the fan in the processing process, thereby reducing the production material of the outer hub 13.

[0047] In combination Figure 2 and Figure 3 In an embodiment of the utility model, the second blade 12 includes a first connecting section and a second connecting section, the first connecting section is connected with the second guide wall 132, and the second connecting section connects the first guide wall 131 and the second guide wall 132.

[0048] In the embodiment, it can be understood that the outer hub 13 includes the first guide wall 131 and the second guide wall 132, and the second blade 12 can connect and reinforce the first guide wall 131 and the second guide wall 132 to enhance the stability and strength of the entire fan blade structure 1. At the same time, by connecting the second guide wall 132 through the first connecting section and connecting the first guide wall 131 and the second guide wall 132 through the second connecting section, the direction and speed of the air flow can be better controlled, thereby improving the aerodynamic efficiency of the blowing equipment.

[0049] In an embodiment of the utility model, the first guide wall 131 is arranged in an arc shape; and / or, the first guide wall 131 and the second guide wall 132 are an integral structure.

[0050] In the embodiment, the first guide wall 131 arranged in an arc shape can optimize the air flow distribution and improve the ventilation efficiency, thereby achieving better guiding of the air flow. Further, the arc shape of the first guide wall is convex towards the inner hub to achieve the guiding of the air flow and reduce the generation of vortex.

[0051] In order to enhance the stability of the overall structure, the first flow guide wall 131 and the second flow guide wall 132 are connected by integrally injection molding, which reduces the problem of stress concentration at the connection and simplifies the manufacturing process; meanwhile, the first flow guide wall 131 and the second flow guide wall 132 can also be connected by 3D printing, and the production scheme of the integral structure is not limited.

[0052] In an embodiment of the utility model, the inner hub 14 includes a first ring body 141 and a second ring body 142 connected, the first ring body 141 is connected with the second blade 12, the connecting place of the second ring body 142 and the first ring body 141 is arc-shaped and abuts against the fan body 2.

[0053] In the embodiment, the first ring body 141 and the second ring body 142 are connected by injection molding, and the boundary line of the two is used as the demolding line of the mold production. It can be understood that the connecting place of the second ring body 142 and the first ring body 141 is arc-shaped, which is beneficial to reduce the resistance of air to the hub and improve the aerodynamic performance of the hub. At the same time, it is helpful to better disperse the stress and improve the strength and rigidity of the whole structure.

[0054] In combination Figure 5 And Figure 6 In an embodiment of the utility model, the second ring body 142 is provided with a first through slot 14a, the first through slot 14a penetrates the second ring body 142, the end surface of the fan body 2 abuts against the second ring body 142 and is limited in the first through slot 14a; or, the second ring body 142 is provided with a second through slot 14b, the second through slot 14b is provided with a mounting structure, and the mounting structure is connected with the fan body 2 in cooperation.

[0055] In the embodiment, in order to cooperate with the setting of the fan body 2, the fan blade structure can adopt different structural designs. When the fan body 2 adopts an outer rotor fan, the second ring body 142 is provided with a first through slot 14a, the outer rotor fan includes a stator, an outer rotor and a bearing, the stator includes a stator shaft and a stator core, the outer rotor is sleeved on the outer periphery of the stator shaft and is arranged around the stator core, and the bearing is arranged between the hollow shaft and the outer rotor to enable the outer rotor to rotate relative to the hollow shaft. At this time, the second ring body 142 is sleeved on the outer side of the outer rotor fan, the end surface of the outer rotor of the outer rotor fan abuts against the second ring body 142 and is limited in the first through slot 14a, so as to realize the stable connection and assembly of the fan blade structure and the outer rotor, guarantee the synchronous rotation of the fan blade structure and the outer rotor, and further improve the structural stability and reliability of the hair dryer.

[0056] When the fan body 2 adopts an inner rotor fan, the second ring body 142 is provided with a second through groove 14b, and the second through groove 14b is provided with a mounting structure, the mounting structure is in a bowl shape, a through hole for clamping a driving shaft of the inner rotor fan is formed in the middle of the mounting structure, and a connecting rib is further formed between the mounting structure and the second ring body 142, so as to enhance the connection strength of the overall structure and further improve the structural stability and reliability of the hair dryer.

[0057] In an embodiment of the present application, the hair dryer further comprises a shell 3, the shell 3 is provided with an air outlet channel, an air inlet and an air outlet communicating with the air outlet channel, and the fan blade structure 1 and the fan body 2 are arranged in the air outlet channel; the hair dryer further comprises an air inlet grille 31 and an air outlet grille 32, the air inlet grille 31 is connected to the shell 3 and covers the air inlet, and the air outlet grille 32 is connected to the shell 3 and covers the air outlet.

[0058] In the embodiment, by arranging the air inlet grille 31 and the air outlet grille 32, the air inlet grille 31 covers the air inlet, and the air outlet grille 32 covers the air outlet, which can prevent the user from accidentally touching the fan blade structure 1 and the fan body 2 during the operation of the hair dryer, and can also prevent some sundries in the environment from entering the air outlet channel and interfering with and colliding with the fan blade structure 1 and the fan body 2, thereby realizing the protection of the fan blade structure 1 and the fan body 2 by the hair dryer and further improving the structural stability and reliability of the hair dryer.

[0059] Further, the air inlet grille 31 can be detachably connected to the shell 3 through thread cooperation, clamping cooperation and the like, so as to realize the assembly convenience and reliability of the air inlet grille 31 and the shell 3, and facilitate subsequent cleaning and maintenance. The air outlet grille 32 can be detachably connected to the shell 3 through thread cooperation, clamping cooperation and the like, so as to realize the assembly convenience and reliability of the air outlet grille 32 and the shell 3, and facilitate subsequent cleaning and maintenance.

[0060] In an embodiment of the present application, the shell 3 further comprises a flow guide table 33, the flow guide table 33 is arranged at the air outlet and opposite to the second blade 12, and the wall surface of the flow guide table 33 facing the fan blade structure 1 is arranged in an inclined manner.

[0061] In the embodiment, the flow guide table 33 is used to achieve a certain flow guiding effect. It can be understood that the flow guide table 33 is inclined to the wall surface of the fan blade structure 1 and is arranged in an arc shape, can guide the air flow under the disturbance of the second blade 12, so that the air flow disturbed by the second blade 12 and the air flow disturbed by the first blade 11 better converge at the air outlet, so as to realize the rapid mixing of the two air flows, and further better improve the flow rate of the mixed air flow generated by the first blade 11, and further improve the air outlet effect of the blowing device.

[0062] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A blow-off apparatus, characterized by, The air blowing device comprises: a fan blade structure comprising a first blade, a second blade, and coaxially arranged outer and inner hubs, the outer hub being sleeved on the outer periphery of the inner hub, the first blade being connected to the outer periphery of the outer hub, and the second blade being connected to the outer hub and the inner hub, the outer wall of the outer hub being arranged in parallel to the air outlet direction on the side facing away from the inner hub, and the inner wall of the outer hub being arranged in an inclined manner on the side facing the inner hub; a fan body connected to the inner hub and used for driving the inner hub to rotate; wherein the number of the first blades is different from that of the second blades.

2. The blowoff apparatus according to claim 1, wherein The number of the first blades is greater than that of the second blades.

3. The blowoff apparatus according to claim 1, wherein The distance between the inner wall of the outer hub and the outer periphery of the inner hub gradually increases along the air outlet direction. And / or, the second blade is arranged in an inclined manner to the rotation center axis of the fan blade structure.

4. The blowoff apparatus according to claim 1, wherein The outer hub comprises a first guide wall and a second guide wall connected to each other, the first blade is connected to the first guide wall, and the second blade is connected to the second guide wall and the inner hub. The second guide wall is arranged in an inclined manner, and the side of the first guide wall facing the second guide wall is arranged at an angle with the side of the second guide wall facing the first guide wall.

5. The blowoff apparatus according to claim 4, wherein The second blade comprises a first connecting section and a second connecting section, the first connecting section is connected to the second guide wall, and the second connecting section is connected to the first guide wall and the second guide wall.

6. The blowoff apparatus according to claim 5, wherein The first guide wall is arranged in an arc shape. And / or, the first guide wall and the second guide wall are an integral structure.

7. The blowoff apparatus as claimed in claim 1, wherein The inner hub comprises a first ring body and a second ring body connected to each other, the first ring body is connected to the second blade, and the second ring body is arranged in an arc shape at the connection position of the first ring body and the second ring body and abuts against the fan body.

8. The blowoff apparatus according to claim 7, wherein The second ring body is provided with a first through groove, the first through groove penetrates through the second ring body, the end surface of the fan body abuts against the second ring body and is limited in the first through groove. Or, the second ring body is provided with a second through groove, the second through groove is provided with a mounting structure, and the mounting structure is connected to the fan body in a matched manner.

9. The blowoff apparatus as claimed in claim 1, wherein The air blowing device further comprises a shell, the shell is provided with an air outlet channel, an air inlet and an air outlet communicating with the air outlet channel, the fan blade structure and the fan body are arranged in the air outlet channel; The air blowing device further comprises an air inlet grille and an air outlet grille, the air inlet grille is connected to the shell and covers the air inlet, and the air outlet grille is connected to the shell and covers the air outlet.

10. The blowoff apparatus according to claim 9, wherein The shell further comprises a flow guide table, the flow guide table is arranged at the air outlet and opposite to the second blade, and the wall surface of the flow guide table facing the fan blade structure is arranged in an inclined manner.

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