Fan blade structure and air outlet device applying same

Abstract

This utility model discloses a fan blade structure and an air outlet device with a fan blade structure. The fan blade structure includes a rotating shaft, a first fan blade, and a second fan blade. Both the first and second fan blades are fixed obliquely on the rotating shaft. The first fan blade has a first blade surface and a second blade surface, and the second fan blade has a third blade surface and a fourth blade surface. When external airflow blows towards the first and second fan blades at an axial direction perpendicular to the rotating shaft, the airflow simultaneously flows through the first and third blade surfaces, or simultaneously flows through the second and fourth blade surfaces. The airflow flowing through the first and third blade surfaces moves in a relatively close direction, while the airflow flowing through the second and fourth blade surfaces moves in a relatively far direction. By rotating the rotating shaft to a specific position and maintaining it in the current position, the airflow can be selectively guided through the first and third blade surfaces, or through the second and fourth blade surfaces, thereby achieving the effect of wind gathering or wind amplification. The overall structure is simple and easy to adjust.

Description

Technical Field

[0001] This utility model relates to the field of air outlet equipment technology, and in particular to a fan blade structure and an air outlet device using the same. Background Technology

[0002] Existing air-discharge products such as air conditioners, bathroom heaters, and blower dryers generally have both vertical and horizontal swing functions. When swinging horizontally, the direction of airflow is changed by the movement of the fan blades. However, during the blowing process, the range of airflow remains fixed, failing to achieve the effect of concentrating or expanding airflow. Utility Model Content

[0003] The present invention aims to at least partially solve one of the aforementioned technical problems in the related art. To this end, the present invention proposes a wind turbine blade structure.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] This utility model also proposes an air outlet device having the above-mentioned fan blade structure.

[0006] According to a first aspect embodiment of the present invention, a fan blade structure includes a rotating shaft, a first fan blade, and a second fan blade. Both the first fan blade and the second fan blade are obliquely fixed on the rotating shaft. The first fan blade has a first blade surface and a second blade surface, and the second fan blade has a third blade surface and a fourth blade surface. When an external airflow blows toward the first fan blade and the second fan blade in an axial direction perpendicular to the rotating shaft, the airflow simultaneously flows through the first blade surface and the third blade surface, or simultaneously flows through the second blade surface and the fourth blade surface. The airflow flowing through the first blade surface and the third blade surface flows in a relatively close direction, and the airflow flowing through the second blade surface and the fourth blade surface flows in a relatively far direction.

[0007] The wind turbine structure according to the embodiment of this utility model has at least the following beneficial effects: by rotating the shaft to a specific position and keeping it in the current position, the wind can be selectively guided through the first and third blades, or through the second and fourth blades, thereby achieving the effect of wind gathering or wind expansion. The overall structure is simple and easy to adjust.

[0008] According to some embodiments of the present invention, the first blade and the third blade are oriented opposite to each other in the axial direction of the rotating shaft, while the second blade and the fourth blade are oriented opposite to each other in the axial direction of the rotating shaft.

[0009] According to some embodiments of the present invention, at least two first fan blades and at least two second fan blades are provided on the rotating shaft. Each first fan blade is distributed sequentially along the axial direction of the rotating shaft with the same orientation, and each second fan blade is distributed sequentially along the axial direction of the rotating shaft with the same orientation. The first fan blades and the second fan blades are paired and mirror-symmetrical with a spatial plane perpendicular to the rotating shaft as a plane of symmetry.

[0010] According to some embodiments of the present invention, both the first and second wind blades are helical blade structures. The first and second wind blades are coaxially arranged on the rotating shaft with opposite rotation directions, and the coiling angle of the first and second wind blades around the central axis of the rotating shaft is not greater than 180°.

[0011] According to some embodiments of the present invention, the first starting edge and the first ending edge of the first fan blade are both perpendicular to the axial direction of the rotating shaft, and the second starting edge and the second ending edge of the second fan blade are both perpendicular to the axial direction of the rotating shaft.

[0012] According to some embodiments of the present invention, the first fan blade and the second fan blade are coiled around the central axis of the rotating shaft at an angle of 180°. When at least two first fan blades and at least two second fan blades are installed on the rotating shaft, the first terminating edge of one first fan blade and the first starting edge of the adjacent first fan blade are on the same straight line along the radial direction of the rotating shaft, and the second terminating edge of one second fan blade and the second starting edge of the adjacent second fan blade are on the same straight line along the radial direction of the rotating shaft.

[0013] According to some embodiments of the present invention, it further includes a first driving mechanism, which is connected to the rotating shaft and can drive the rotating shaft to rotate and be positioned at a preset position.

[0014] According to some embodiments of the present invention, the rotating shaft includes at least two shaft segments connected sequentially along the axial direction, and each shaft segment is provided with one of the first fan blade and the second fan blade.

[0015] According to a second aspect of the present invention, an air outlet device includes a housing, a fan, and a fan blade structure, wherein the fan is mounted on the housing, and the fan blade structure is mounted at the air outlet of the housing.

[0016] The air outlet device according to the embodiment of this utility model has at least the following beneficial effects: realizing the function of concentrating or expanding the air outlet.

[0017] According to some embodiments of this utility model, it further includes a second driving mechanism and an air guide plate. The second driving mechanism is connected to the air guide plate. The air guide plate is oscillatingly installed at the air outlet. The air guide plate oscillates longitudinally relative to the air outlet. The axial direction of the rotating shaft is lateral relative to the air outlet.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a structural diagram of the wind turbine blades;

[0021] Figure 2 This is a schematic diagram of the wind turbine blade structure in the wind-gathering position;

[0022] Figure 3 This is a schematic diagram of the fan blade structure in the air-expanding position;

[0023] Figure 4 yes Figure 1 Partial structural diagram;

[0024] Figure 5 yes Figure 1 Partial structural diagram;

[0025] Figure 6 yes Figure 4 The right view;

[0026] Figure 7 yes Figure 5 The left view;

[0027] Figure 8 This is a schematic diagram of the internal structure of the air outlet device.

[0028] Reference numerals: Shaft 100; Shaft segment 110; First fan blade 200; First starting edge 201; First ending edge 202; First blade surface 210; Second blade surface 220; Second fan blade 300; Second starting edge 301; Second ending edge 302; Third blade surface 310; Fourth blade surface 320; First drive mechanism 400; Housing 500; Air outlet 510; Fan 600; Second drive mechanism 700; Air guide vane 800. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] This utility model relates to a wind turbine structure, including a rotating shaft 100, a first wind turbine blade 200, and a second wind turbine blade 300.

[0031] like Figure 1 , Figure 2 and Figure 3As shown, the rotating shaft 100 can be a solid rod-like structure, or a hollow rod-like structure, frame-like structure, etc. The first fan blade 200 and the second fan blade 300 are obliquely mounted on the rotating shaft 100. The first fan blade 200 and the second fan blade 300 can be integrally injection molded onto the rotating shaft 100, or they can be installed as independent components onto the rotating shaft 100 through methods such as insertion, snap-fit, screw locking, gluing, or welding. The first fan blade 200 and the second fan blade 300 are fixed relative to the rotating shaft 100. When the rotating shaft 100 rotates, it can drive the first fan blade 200 and the second fan blade 300 to rotate synchronously. The two side blades of the first fan blade 200 are the first blade surface 210 and the second blade surface 220, respectively. The two side blades of the second fan blade 300 are the third blade surface 310 and the fourth blade surface 320, respectively. The first blade surface 210, the second blade surface 220, the third blade surface 310, and the fourth blade surface 320 all have an oblique angle relative to the axial direction of the rotating shaft 100. When external airflow blows towards the rotating shaft 100 along its axial direction perpendicular to the shaft, it flows through the first blade 200 and the second blade 300. When the airflow impacts the first blade surface 210, the first blade surface 210 generates a first thrust F1 on the airflow. This first thrust F1 is parallel to the axial direction of the rotating shaft 100, causing the airflow to deflect from its original perpendicular direction after passing through the first blade surface 210. When the airflow impacts the second blade surface 220, the second blade surface 220 generates a second thrust F2 on the airflow. This second thrust F2 is parallel to the axial direction of the rotating shaft 100, causing the airflow to deflect from its original perpendicular direction after passing through the second blade surface 220. When the airflow impacts the third blade surface 310, the third blade surface 310 generates a third thrust F3 on the airflow. This third thrust F3 is parallel to the axial direction of the rotating shaft 100, causing the airflow to deflect from its original perpendicular direction after passing through the third blade surface 310. When the airflow impacts the fourth blade 320, the fourth blade 320 generates a fourth thrust F4 on the airflow. The fourth thrust F4 is parallel to the axial direction of the rotating shaft 100, and the airflow deflects from its original direction perpendicular to the rotating shaft 100 after passing through the fourth blade 320. The first thrust F1 and the second thrust F2 are in opposite directions, the third thrust F3 and the fourth thrust F4 are in opposite directions, the first thrust F1 and the fourth thrust F4 are in the same direction, and the second thrust F2 and the third thrust F3 are in the same direction. Specifically, based on the positions of the first fan blade 200 and the second fan blade 300 on the rotating shaft 100, and the rotation of the rotating shaft 100 to its current position, when the external airflow blows towards the first fan blade 200 and the second fan blade 300 along an axial direction perpendicular to the rotating shaft 100, the airflow will simultaneously flow towards the first blade surface 210 and the third blade surface 310. At this time, the second blade surface 220 and the fourth blade surface 320 will have little or no airflow passing through them. In the illustrated direction, the direction of airflow perpendicular to the rotating shaft 100 is defined as the forward flow direction. The first blade surface 210 generates a first rightward thrust F1 on the flowing airflow, causing the originally forward-flowing airflow to deflect to the right.The third blade 310 generates a third thrust force F3 to the left on the airflow, causing the originally forward-flowing airflow to deflect to the left. That is, under the action of the first blade 210 and the third blade 310, the airflow flows forward through the fan structure and then converges, reducing the range of airflow and creating a converging effect. Rotating the shaft 100 causes the second blade 220 and the fourth blade 320 to face the airflow perpendicular to the shaft 100. At this time, the first blade 210 and the third blade 310 have little or no airflow passing through them. In the direction shown in the diagram, the direction of airflow perpendicular to the shaft 100 is defined as the forward flow direction. The second blade 220 generates a second thrust force F2 to the left on the airflow, causing the originally forward-flowing airflow to deflect to the left. The third blade 310 generates a fourth thrust force F4 to the right on the airflow, causing the originally forward-flowing airflow to deflect to the right. That is, under the action of the second blade 220 and the fourth blade 320, the airflow flows forward through the fan blade structure and then disperses relatively far apart, expanding the range of the airflow and creating a wind-expanding effect. By rotating the shaft 100 to a specific position and holding it in the current position, the airflow can be selectively guided through the first blade 210 and the third blade 310, or through the second blade 220 and the fourth blade 320, thereby achieving the effect of wind gathering or wind expansion. The overall structure is simple and easy to adjust.

[0032] In one embodiment, such as Figure 2 As shown, the first blade 210 and the third blade 310 are inclined relative to the axial direction of the rotating shaft 100, and their orientations are opposite in the axial direction of the rotating shaft 100. This causes the airflow direction passing through the first blade 210 and the third blade 310 to be deflected, creating a wind-gathering effect. Figure 3 As shown, the second blade 220 and the fourth blade 320 are inclined relative to the axial direction of the rotating shaft 100, and the second blade 220 and the fourth blade 320 face away from each other in the axial direction of the rotating shaft 100. This causes the airflow direction to be deflected when passing through the second blade 220 and the fourth blade 320, thus creating a wind-expanding effect.

[0033] The rotating shaft 100 may be equipped with one, two, or more first fan blades 200 and second fan blades 300. When the rotating shaft 100 is equipped with at least two first fan blades 200 and at least two second fan blades 300, the first fan blades 200 are distributed sequentially along the axial direction of the rotating shaft 100 with the same orientation. The second fan blades 300 are also distributed sequentially along the axial direction of the rotating shaft 100 with the same orientation. Taking the spatial plane A at the center perpendicular to the axial direction of the rotating shaft 100 as the plane of symmetry, the first fan blades 200 are sequentially arranged on the rotating shaft 100 to the left of the spatial plane A, and the second fan blades 300 are sequentially arranged on the rotating shaft 100 to the right of the spatial plane A. With the spatial plane A as the plane of symmetry, the first fan blades 200 and the second fan blades 300 are paired and mirror-symmetrical.

[0034] Based on the above embodiments, such as Figure 1 , Figure 4 and Figure 5 As shown, both the first blade 200 and the second blade 300 are helical blade structures. The first blade 200 and the second blade 300 are coaxially mounted on the rotating shaft 100 with opposite directions of rotation. The first blade surface 210, the second blade surface 220, the third blade surface 310, and the fourth blade surface 320 are all helical. The coiling angle of the first blade 200 and the second blade 300 around the central axis of the rotating shaft 100 is no greater than 180°. Figure 6 As shown, viewed from the right side of the rotating shaft 100, the first fan blade 200 surrounds the central axis of the rotating shaft 100, and the angle B formed between the starting position and the ending position of the first fan blade 200 is no greater than 180°. Figure 7 As shown, viewed from the left side of the rotating shaft 100, the second blade 300 surrounds the central axis of the rotating shaft 100, and the angle C formed between the starting and ending positions of the second blade 300 is no greater than 180°. Initially, the first blade 210 and the third blade 310 face the airflow perpendicular to the rotating shaft 100, while the second blade 220 and the fourth blade 320 are completely opposite to the airflow, and there is no airflow on the second blade 220 and the fourth blade 320. Rotating the rotating shaft 100 by 180° causes the second blade 220 and the fourth blade 320 to face the airflow, while the first blade 210 and the third blade 310 are completely opposite to the airflow, and there is no airflow on the first blade 210 and the third blade 310.

[0035] In this design, the side of the first blade 200 at its starting position is defined as the first starting edge 201, and the side of its ending position is defined as the first ending edge 202. Both the first starting edge 201 and the first ending edge 202 are perpendicular to the axial direction of the rotating shaft 100. When the first blade surface 210 faces the airflow, the airflow flows from the first starting edge 201 along the first blade surface 210 towards the first ending edge 202. When the second blade surface 220 faces the airflow, the airflow flows from the first ending edge 202 along the second blade surface 220 towards the first starting edge 201. The arrangement of the first starting edge 201 and the first ending edge 202 allows the airflow to effectively impact the first blade surface 210 or the second blade surface 220 and flow in a swirling direction to change the flow direction. The side of the second blade 300 at its starting position is defined as the second starting edge 301, and the side of its ending position is defined as the second ending edge 302. Both the second starting edge 301 and the second ending edge 302 are perpendicular to the axial direction of the rotating shaft 100. When the third blade 310 faces the airflow, the airflow flows from the second starting edge 301 along the third blade 310 towards the second ending edge 302. When the fourth blade 320 faces the airflow, the airflow flows from the second ending edge 302 along the fourth blade 320 towards the second starting edge 301. The arrangement of the second starting edge 301 and the second ending edge 302 allows the airflow to effectively impact the third blade 310 or the fourth blade 320, flowing in a swirling direction to change the flow direction.

[0036] Based on the above embodiment, the first fan blade 200 and the second fan blade 300 are wound around the central axis of the rotating shaft 100 at an angle of 180°. For example... Figure 6 and Figure 7As shown, the first starting edge 201 and the first ending edge 202 on the same first blade 200 are aligned along the radial direction of the shaft 100. When at least two first blades 200 and at least two second blades 300 are installed on the shaft 100, the first blades 200 are sequentially distributed along the axial direction of the shaft 100. Between two adjacent first blades 200, the first ending edge 202 of the previous first blade 200 and the first starting edge 201 of the next first blade 200 are aligned along the radial direction of the shaft 100, that is, the first blades 200 are sequentially and closely distributed along the axial direction of the shaft 100. When the airflow blows towards each first blade surface 210 or second blade surface 220, the airflow will inevitably impact each first blade surface 210 or second blade surface 220, causing the airflow to change direction and ensuring that the airflow forms a wind-gathering or wind-expanding effect. The second blades 300 are sequentially distributed along the axial direction of the shaft 100. Between two adjacent second blades 300, the second termination edge 302 of the previous second blade 300 and the second starting edge 301 of the next second blade 300 are on the same straight line along the radial direction of the rotation axis 100, that is, the second blades 300 are sequentially and closely distributed along the axial direction of the rotation axis 100. When the airflow blows towards each third blade surface 310 or fourth blade surface 320, the airflow will inevitably impact each third blade surface 310 or fourth blade surface 320, causing the airflow to change direction and ensuring that the airflow forms a wind-gathering or wind-expanding effect.

[0037] In one embodiment, such as Figure 1 As shown, the fan blade structure also includes a first drive mechanism 400, which can be a servo motor or similar device. The first drive mechanism 400 is connected to the rotating shaft 100. The first drive mechanism 400 can drive the rotating shaft 100 to rotate a certain angle to a preset position and then stop rotating, thus positioning the rotating shaft 100 at the preset position. This changes the position of the first fan blade 200 and the second fan blade 300, causing the first blade surface 210 and the third blade surface 310 to face the airflow, or causing the second blade surface 220 and the fourth blade surface 320 to face the airflow, thereby switching between the wind gathering function and the wind amplification function and maintaining the current functional state.

[0038] In one embodiment, the rotating shaft 100 can be integrally formed. Alternatively, as... Figure 1 , Figure 4 and Figure 5 As shown, the rotating shaft 100 includes at least two shaft segments 110 connected sequentially along the axial direction. Each shaft segment 110 is provided with one of a first fan blade 200 and a second fan blade 300. The shaft segments 110 can be connected by couplings or by end-fitting connections, so that the shaft segments 110 are relatively fixed and rotate synchronously. Depending on the product model requirements, the shaft segments 110 provided with the first fan blade 200 or the second fan blade 300 can be selectively and quickly combined.

[0039] This utility model also relates to an air outlet device, which can be a bathroom heater, air conditioner, blower, etc. Figure 8 As shown, the air outlet device includes a housing 500, a fan 600, and a fan blade structure. An air outlet 510 is provided on the housing 500. The fan 600 is mounted on the housing 500, and an air duct can be provided within the housing 500 to connect the fan 600 and the air outlet 510. The fan blade structure is installed at the air outlet 510. When the fan 600 operates, it generates airflow that blows towards the air outlet 510. The airflow is perpendicular or approximately perpendicular to the axial direction of the rotating shaft 100 and blows towards the fan blade structure. Then, through the positions of the first fan blade 200 and the second fan blade 300 of the fan blade structure, it forms a converging or expanding airflow effect and is blown out of the air outlet 510.

[0040] In one embodiment, the air outlet device further includes a second drive mechanism 700 and a guide vane 800. The second drive mechanism 700 is a reversible motor. The second drive mechanism 700 is connected to the guide vane 800. The second drive mechanism 700 drives the guide vane 800 to swing. The guide vane 800 is oscillatingly mounted at the air outlet 510. In the direction shown in the figure, the guide vane 800 swings vertically relative to the air outlet 510, while the axis of the rotating shaft 100 is laterally positioned relative to the air outlet 510. In conjunction with the wind-gathering or wind-expanding function of the fan blade structure, the vertical swing of the guide vane 800 achieves vertical sweeping of the airflow.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this specification, references to terms such as "some specific embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wind turbine blade structure, characterized in that: The device includes a rotating shaft (100), a first fan blade (200), and a second fan blade (300). Both the first fan blade (200) and the second fan blade (300) are fixed obliquely on the rotating shaft (100). The first fan blade (200) has a first blade surface (210) and a second blade surface (220), and the second fan blade (300) has a third blade surface (310) and a fourth blade surface (320). When an external airflow blows toward the first fan blade (200) and the second fan blade (300) in an axial direction perpendicular to the rotating shaft (100), the airflow flows through the first blade surface (210) and the third blade surface (310) at the same time, or the airflow flows through the second blade surface (220) and the fourth blade surface (320) at the same time. The airflow flowing through the first blade surface (210) and the third blade surface (310) flows in a relatively close direction, and the airflow flowing through the second blade surface (220) and the fourth blade surface (320) flows in a relatively far direction.

2. The wind turbine blade structure according to claim 1, characterized in that: The first blade (210) and the third blade (310) are oriented opposite each other in the axial direction of the rotating shaft (100), while the second blade (220) and the fourth blade (320) are oriented opposite each other in the axial direction of the rotating shaft (100).

3. The wind turbine blade structure according to claim 1, characterized in that: The rotating shaft (100) is provided with at least two first fan blades (200) and at least two second fan blades (300). Each first fan blade (200) is arranged in the same orientation along the axial direction of the rotating shaft (100), and each second fan blade (300) is arranged in the same orientation along the axial direction of the rotating shaft (100). The first fan blades (200) and the second fan blades (300) are paired and mirror-symmetrical with a spatial plane perpendicular to the rotating shaft (100) as the plane of symmetry.

4. The wind turbine blade structure according to any one of claims 1 to 3, characterized in that: Both the first fan blade (200) and the second fan blade (300) are spiral blade structures. The first fan blade (200) and the second fan blade (300) are coaxially arranged on the rotating shaft (100) with opposite directions of rotation, and the coiling angle of the first fan blade (200) and the second fan blade (300) around the central axis of the rotating shaft (100) is no greater than 180°.

5. The wind turbine blade structure according to claim 4, characterized in that: The first starting edge (201) and the first ending edge (202) of the first fan blade (200) are both perpendicular to the axial direction of the rotating shaft (100), and the second starting edge (301) and the second ending edge (302) of the second fan blade (300) are both perpendicular to the axial direction of the rotating shaft (100).

6. The wind turbine blade structure according to claim 5, characterized in that: The first fan blade (200) and the second fan blade (300) are coiled around the central axis of the rotating shaft (100) at an angle of 180°. When at least two first fan blades (200) and at least two second fan blades (300) are installed on the rotating shaft (100), the first termination edge (202) of one first fan blade (200) and the first starting edge (201) of the adjacent first fan blade (200) are on the same straight line along the radial direction of the rotating shaft (100), and the second termination edge (302) of one second fan blade (300) and the second starting edge (301) of the adjacent second fan blade (300) are on the same straight line along the radial direction of the rotating shaft (100).

7. The wind turbine blade structure according to claim 1, characterized in that: It also includes a first drive mechanism (400), which is connected to the rotating shaft (100). The first drive mechanism (400) can drive the rotating shaft (100) to rotate and position it at a preset position.

8. The wind turbine blade structure according to any one of claims 1 to 3, characterized in that: The rotating shaft (100) includes at least two shaft segments (110) connected sequentially along the axial direction, and each shaft segment (110) is provided with one of the first fan blade (200) and the second fan blade (300).

9. An air outlet device, characterized in that, The device includes a housing (500), a fan (600), and a fan blade structure as described in any one of claims 1 to 8, wherein the fan (600) is mounted on the housing (500), and the fan blade structure is mounted at the air outlet (510) of the housing (500).

10. The air outlet device according to claim 9, characterized in that: It also includes a second drive mechanism (700) and a guide vane (800), the second drive mechanism (700) being connected to the guide vane (800), the guide vane (800) being oscillatingly mounted at the air outlet (510), the guide vane (800) oscillating longitudinally relative to the air outlet (510), and the axis of the rotating shaft (100) being transversely arranged relative to the air outlet (510).

Images