A fan capable of storing fan blades

Abstract

A fan capable of storing fan blades relates to the technical field of fan, including a boom, a motor connected at the bottom end of the boom, a fan blade disc driven by the rotating shaft of the motor, two or more fan blades symmetrically connected on the fan blade disc, characterized by: setting a swing element, the swing element is provided with the same number of connecting points as the number of fan blades, when the center of gravity of the swing element is located on the rotating shaft axis of the motor, the vertical distance between each connecting point and the rotating shaft axis is the same, the fan blade is provided with a spring connecting point, the spring connecting point on each fan blade is connected with the spring connecting point on the matching fan blade, the vertical distance between the spring connecting point on each fan blade and the rotating axis of the fan blade is the same, and the fan blade is provided with a rear mounting structure. Compared with the prior art, the utility model has the advantages of simple structure, smooth unfolding and storing of fan blades, guaranteed fan blowing efficiency, and low logistics cost.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a fan that can store fan blades. Background Technology

[0002] Existing fans capable of retracting fan blades include a motor-driven turntable, several fan blades rotating on the turntable, a synchronization structure between the turntable and the fan blades, and a light panel below the turntable. When the fan stops working, the fan blades unfold synchronously under the combined action of centrifugal force and the synchronization structure to ensure dynamic balance and normal operation. After the fan stops working, the fan blades move towards the turntable under the rotational force of the retraction structure, and the positioning mechanism of the retraction structure ensures that the inner edges of the fan blades rest against the outer edge of the turntable. The fan blades are connected end-to-end to form a circle and are retracted behind the light panel. The existing synchronization structure uses gear / rack technology. A gear is connected to the rotating head of the fan blades, and a circular rack rotates along the motor shaft. When the fan blades rotate, they drive the gear to rotate, which in turn drives the circular rack. Since each fan blade unfolds or retracts synchronously through the meshing of the gear and the circular rack, all fan blades do so. This type of fan with retractable fan blades has a gear and rack meshing mechanism, but both gears and racks are in an open state. Over time, dust easily accumulates, leading to poor transmission. Moreover, the structure is complex and the cost is high. In addition, since the weight of each fan blade is not the same, dynamic balancing is required, which significantly affects the manufacturing efficiency of the fan. Furthermore, as disclosed in patent 202422675312.4, the fan blade limiting mechanism of the fan with retractable fan blades includes a turntable, fan blades rotatably mounted on the turntable, a shim between the rotating part of the fan blade and the turntable, a guide groove on the rotating part of the fan blade, and a guide post on the shim corresponding to the guide groove. Since the assembly of this patented technology requires professional skills, it needs to be assembled in the factory. The assembled fan blade part includes fan blades, a turntable, a spring, and a ring-shaped object, resulting in a large and complex component that requires large packaging, leading to high storage and logistics costs. Summary of the Invention

[0003] The purpose of this invention is to provide a fan that can retract its fan blades without shaking when the fan blades are unfolded or retracted, has a simple structure, requires no dynamic balancing adjustment, has high production efficiency, and low storage and logistics costs.

[0004] This utility model is implemented as follows: The device includes a boom, a motor connected to the bottom of the boom, a fan blade disk driven by the motor's shaft, and two or more fan blades symmetrically rotated and connected to the fan blade disk. Its special feature is that it includes a swing element with the same number of connection points as the number of fan blades. When the center of gravity of the swing element is located on the axis of the motor's shaft, the vertical distance between each connection point and the axis of the shaft is the same. Each fan blade has a spring connection point, and a spring connects each connection point on the swing element to the spring connection point on the matching fan blade. The vertical distance between the spring connection point on each fan blade and the axis of rotation of that fan blade is the same. The fan blade includes a fan blade body and a rotating component mounted on the fan blade disk. The rotating component includes a slip ring component fixed on the mounting hole of the fan blade disk and a rotating part. The rotating part is positioned on the slip ring component and rotates relative to the slip ring component. A spring connects the rotating part and the oscillating part. A non-circular hole is provided on the rotation axis of the rotating part. A matching non-circular post is provided on the fan blade body. The non-circular post is embedded in the non-circular hole and fixed with screws, so that the fan blade body is subsequently fixed on the rotating part.

[0005] Preferably, the slip ring component includes an upper slip ring and a lower slip ring respectively positioned at both ends of the fan blade disk mounting hole. The rotating component includes an upper rotating part rotatably mounted on the upper slip ring and a lower rotating part rotatably mounted on the lower slip ring. At least one of the middle portions of the upper rotating part and the lower rotating part is provided with a short shaft, which rotatably passes through the holes of the upper slip ring and the lower slip ring. The upper rotating part and the lower rotating part are connected together, so that the upper rotating part and the lower rotating part are respectively positioned on the outside of the upper slip ring and the lower slip ring. The short shaft allows the upper rotating part and the lower rotating part to be rotatably mounted on the upper slip ring and the lower slip ring. A non-circular hole is provided in the middle portion of the upper rotating part. A non-circular post matching the non-circular hole is provided at the connecting end of the fan blade body. The non-circular post passes through the middle portion of the lower rotating part and is inserted into the non-circular hole provided in the middle portion of the upper rotating part and connected in the non-circular hole. A spring connects the upper rotating part and the oscillating part.

[0006] The oscillating component is a rod-shaped object, and the fan blades are two pieces, with the connection points located at both ends of the rod-shaped object; Alternatively, the oscillating component may be an equilateral polygonal ring, a circular ring, an equilateral polygonal disk, or a disc. The number of sides of the equilateral polygonal ring or the equilateral polygonal disk may match the number of fan blades. The connection point may be located at the corner of the equilateral polygonal ring, or at the corner of the equilateral polygonal disk, or the connection point may be symmetrically arranged on the circular ring.

[0007] When the oscillating component is a rod-shaped object; When a fan with retractable fan blades is not in operation, the fan blades are in a retracted state under the action of the spring and the limiting structure set at the rotating end of the fan blades. At this time, the rotation axis of the two fan blades, the spring connection point and the connection point are on a straight line, the distance between the spring connection point and the connection point is the smallest, and the elastic force is the smallest, so as to facilitate the rapid unfolding of the fan blades. When a fan that can retract its blades is working, under the action of centrifugal force, the fan blades unfold. The fan blades rotate and unfold along the rotation axis of the fan blades, and the rod-shaped object rotates around its center. This keeps the connection points of the two springs on the fan blades and the connection points of the two springs on the rod-shaped object in a straight line. Since the distances from the rotation axis of the two fan blades to the connection points of the springs on the fan blades are the same, and the distances from the connection points of the two springs on the fan blades to the connection points of the springs on the rod-shaped object are basically the same, the rotation angles of the two fan blades are the same, thus ensuring that the two fan blades unfold synchronously. The distance from the connection points of the springs on the fan blades to the connection points of the springs on the swing rod gradually increases. Under the action of the spring force at both ends, the rod-shaped object rotates around its center. The unfolding of fan blades affects the overall center and dynamic balance of the fan. When the weights of the two fan blades are slightly different (due to manufacturing technology, the weight of each fan blade will vary slightly, but the difference is small), the unfolding amplitude of the two fan blades will be slightly different to ensure dynamic balance. The difference in unfolding amplitude will inevitably lead to differences in spring tension and wind resistance. At this time, the torque is adjusted by the adaptive swinging and moving of the rod to balance the difference in spring tension and wind resistance. Even if the wind resistance and spring tension are different due to the different unfolding amplitude of the two fan blades, they can be compensated for by the swinging and moving of the rod, thereby ensuring the unfolding of the two fan blades and their dynamic balance after unfolding, and avoiding fan wobbling.

[0008] When the oscillating component is an equilateral polygonal ring, circular ring, equilateral polygonal disk, or disk; When a fan with retractable fan blades is not working, under normal circumstances, the fan blades are in the retracted state. Under the action of the spring and the limiting structure set at the rotating end of the matching fan blade, the fan blades are in the retracted state. The line connecting the spring connection point on the matching fan blade, the rotation axis of the matching fan blade, and the connection point on the swing member is a straight line. The extension of this straight line intersects the axis of the motor. The distance from the spring connection point on the fan blade to the matching connection point on the swing member is the smallest. When a fan with retractable blades operates, the blades unfold under centrifugal force. The blades rotate and unfold along their axis of rotation. The distance between the spring connection point on each blade and its connection point on the equilateral polygonal ring, circular ring, or disk gradually increases. Under the spring force, the equilateral polygonal ring, circular ring, or disk rotates around its center, ensuring that the spring connection points on each blade, the connection points on the equilateral polygonal ring, circular ring, or disk, and the motor axis remain aligned. Since the distance from the rotation axis of each fan blade to its spring connection point is the same, and the distance from each spring connection point on the corresponding blade to its connection point on the equilateral polygonal ring, circular ring, or disk is essentially the same, the rotation angles of each fan blade are essentially the same, thus ensuring that the fan blades unfold synchronously. The distance from the spring connection point on the fan blade to the connection point on the equilateral polygonal ring, circular ring, or equilateral polygonal disk gradually increases. When the weight of each fan blade is slightly different, the unfolding amplitude of each fan blade is slightly different to ensure dynamic balance. The lighter fan blades have a larger unfolding amplitude, and the heavier fan blades have a smaller unfolding amplitude. The difference in unfolding amplitude inevitably leads to differences in spring tension and wind resistance. At this time, the torque is adjusted by the adaptive oscillation of the equilateral polygonal ring, circular ring, or equilateral polygonal disk to balance the differences in spring tension and wind resistance. Even if the wind resistance and spring tension are different due to the different unfolding amplitudes of each fan blade, they can be compensated for by the oscillation of the equilateral polygonal ring, circular ring, or equilateral polygonal disk, thus ensuring the unfolding of each fan blade and the dynamic balance after unfolding, and avoiding fan wobbling.

[0009] By employing rotating component technology, the rotating parts requiring high-skill assembly, along with the fan blade disk, can be pre-assembled in the factory. Since the volume and shape of the fan blade disk with the assembled rotating components are not significantly different from a standalone fan blade disk, and there are no obvious protrusions, the space of standard packaging can be fully utilized when packaging the fan's support rod, motor, fan blade disk, and fan blades, effectively reducing the overall packaging volume. Simultaneously, the assembly of the high-skill rotating components and fan blade disk is completed in the factory. Fan blade installation only requires inserting the non-circular post at the connecting end of the fan blade body through the middle of the lower rotating component and into the non-circular hole in the middle of the upper rotating component, then tightening the screws. This requires low skill, while the installation of the fan blades, which requires only low skill, is left to the user. Therefore, packaging the fan's support rod, motor, fan blade disk, and fan blades separately fully utilizes the space of standard packaging, effectively reducing the overall packaging volume. The smaller packaging space facilitates transportation and warehousing, thus effectively saving logistics costs.

[0010] Existing technologies require dynamic balancing to prevent fan wobbling during operation because the positions of each component are fixed, which significantly impacts production efficiency. However, the technology in this patent application automatically balances the centrifugal force and spring tension when the fan blades unfold. Even if weight differences exist among the fan blades, causing dynamic balancing issues during unfolding and fan rotation, the automatic adjustment via spring tension and the movement of rods, equilateral polygonal rings, or circular discs eliminates the need for dynamic balancing adjustments during production, effectively improving efficiency. Furthermore, the absence of a synchronization structure results in a simpler structure and lower manufacturing costs. The use of rotating component technology reduces the space occupied by the packaging, making transportation and warehousing convenient, and thus effectively saving logistics costs.

[0011] Compared with existing technologies, this invention has the advantages of ensuring that the fan blades will not shake when unfolded or retracted, simple structure, no need for dynamic balancing, high production efficiency, and low storage and logistics costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of embodiment 1 of the present invention, which is capable of retracting fan blades (when the fan blades are retracted); Figure 2 This is a schematic diagram of the fan blades when the fan blades of Embodiment 1 of the present invention, which can store fan blades, are unfolded. Figure 3This is a schematic diagram of the principle of the fan blades being stored in Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the fan blades when unfolded in Embodiment 2 of the present invention, which is a fan capable of storing fan blades. Figure 5 This is a schematic diagram of the principle of the fan blades being stored in Embodiment 3 of the present invention. Figure 6 This is a schematic diagram of the fan blades when the fan blades of Embodiment 3 of the present invention, which can store fan blades, are unfolded. Figure 7 This is a schematic diagram of the fan blades when the fan blades of Embodiment 4 of the present invention, which can store fan blades, are unfolded. Figure 8 This is a schematic diagram of the rotating component; Figure 9 An exploded view of the rotating component from another perspective.

[0013] Explanation of reference numerals in the attached diagram: A - Connection point; B - Spring connection point; C - Rotation axis; O - Center of gravity; 1 - Suspension rod; 2 - Motor; 3 - Fan blade disk; 301 - Hat-shaped center; 302 - Hat brim; 4-Fan blade; 5-Fan blade limiting mechanism; 501-Arc groove; 502-Protrusion; 6-Spring; 7-Rod-like object; 8-Fan blade body; 801-Non-circular column; 9-Rotating component; 901-Upper sliding ring; 902-Lower sliding ring; 903-Upper rotating component; 904-Lower rotating component; 905-Short shaft; 906-Inlay block; 907-Inlay opening; 908-Inlay notch; 909-Pin; 910-Pin hole; 911-Screw hole; 912-Non-circular hole; 913-Threaded hole; 10-Mounting hole; 11-Spring hook post; 12-Spring hook hole; 13-Equilateral triangular ring; 14-Circular ring; 15-Lamp holder; 16-Quadrilateral ring. Detailed Implementation

[0014] The present invention, a fan capable of housing fan blades, will now be described in further detail with reference to the accompanying drawings and embodiments: Example 1: As Figure 1 , 2As shown in Figures 8 and 9, the fan capable of retracting fan blades of the present invention includes a suspension rod 1, a motor 2 connected to the bottom end of the suspension rod 1, a fan blade disk 3 driven by the motor 2, and two or more fan blades 4 symmetrically rotatably connected to the fan blade disk 3. A fan blade limiting mechanism 5 is provided between the fan blades 4 and the fan blade disk 3 to limit the amplitude of the fan blades 4 from retraction to unfolding. Its special feature is that: a swinging component is provided, and the swinging component is provided with the same number of connection points A as the number of fan blades 4. When the center of gravity O of the swinging component is located on the axis of rotation of the motor 2, the vertical distance between each connection point A and the axis of rotation of the motor 2 is the same. A spring connection point B is provided on the fan blades 4. A spring 6 is connected between each connection point A on the swinging component and the spring connection point B on the matching fan blade 4. The vertical distance between the spring connection point B on each fan blade 4 and the rotation axis C of the fan blade 4 is the same. like Figure 8 , 9 As shown, the fan blade 4 includes a fan blade body 8 and a rotating component 9 disposed on the fan blade disk 3. The rotating component 9 includes a slip ring component fixed on the fan blade disk mounting hole 10 and a rotating part. The rotating part is positioned on the slip ring component and rotates relative to the slip ring component. A spring 6 is connected between the rotating part and the oscillating part. A non-circular hole 912 is provided on the rotation axis of the rotating part. A matching non-circular post 801 is provided on the fan blade body 8. The non-circular post 901 is embedded in the non-circular hole 912 and fixed by screws, so that the fan blade body 8 is subsequently fixed on the rotating part.

[0015] The slip ring component includes an upper slip ring 901 and a lower slip ring 902, which are respectively positioned at both ends of the mounting holes 10 of the fan blade disk 3. The rotating component includes an upper rotating member 903 rotatably mounted on the upper slip ring 901 and a lower rotating member 904 rotatably mounted on the lower slip ring 902. The inner side of the upper rotating member 903 rests against the outer side of the upper slip ring 901, and the inner side of the lower rotating member 904 rests against the outer side of the lower slip ring 902. At least one of the inner middle parts of the upper rotating member 903 and the lower rotating member 904 is provided with a short shaft 905 (in the embodiment, both the inner middle parts of the upper rotating member 903 and the inner middle parts of the lower rotating member 904 are provided with short shafts 905). The short shaft 905 rotatably passes through the hole in the upper slip ring 901 and the lower slip ring 902. On the holes, the upper slip ring 901 and the lower slip ring 902 have symmetrically positioned insert blocks 906 and insert openings 907 on their opposite sides. Two insert recesses 908 are provided inside the fan blade disk 3 mounting holes 9 corresponding to the insert blocks 906 of the upper slip ring 901 and the lower slip ring 902. The insert block 906 of the upper slip ring 901 passes through one insert recess 908 and is inserted into the insert opening 907 of the lower slip ring 902. The insert block 906 of the lower slip ring 902 passes through the other insert recess 908 and is inserted into the insert opening 907 of the upper slip ring 901. Due to the stopping action of the insert recesses 908, the connected upper slip ring 901 and lower slip ring 902 cannot rotate within the fan blade disk 3 mounting holes 9. After the upper rotating part 903 and the lower rotating part 904 are positioned and connected by pin 909 and pin hole 910, they are then fixed together by screws (not shown in the figure) passing through screw hole 911, so that the upper rotating part 903 and the lower rotating part 904 are respectively positioned on the outside of upper slip ring 901 and lower slip ring 902. Through short shaft 905, the upper rotating part 903 and the lower rotating part 904 are rotatably mounted on upper slip ring 901 and lower slip ring 902. A non-circular hole 912 is provided in the middle of the inner side of the upper rotating part 903. A non-circular post 801 is provided at the connecting end of the fan blade body 8 corresponding to the non-circular hole 912. The non-circular post 801 passes through the middle of the lower rotating part 904 and is inserted into the non-circular hole 912 in the middle of the inner side of the upper rotating part 903. The fan blade limiting mechanism 5 is fixedly connected to the non-circular hole 912 by a screw (not shown in the figure) that passes through the non-circular post 801 and is screwed into the threaded hole 913 at the bottom of the non-circular hole 912 (which may be a nut embedded in the bottom of the non-circular hole 912). The spring 6 is connected between the spring hook post 11 of the upper rotating member 903 and the spring hook hole 12 of the swing member (rod 7). The fan blade limiting mechanism 5 includes an arc-shaped groove 501 provided on the wall of the hole 902 of the upper sliding ring 901 and the lower sliding ring, and a protrusion 502 provided on the outer wall of the short shaft 905. The arc-shaped groove 501 limits the sliding distance of the protrusion 502, thereby limiting the rotation angle of the upper rotating member 903 and the lower rotating member 904, thereby limiting the unfolding or retracting position of the fan blade body 8. Since the fan blades 4 rotate along the axis of rotation C when they unfold, one end of the spring 6 will also rotate along the spring connection point B. Moreover, the radius of rotation is large. A spring hook post 11 is used so that one of the ring-shaped ends of the spring 6 is sleeved on the spring hook post 11, so that the spring hook post 11 and one of the ring-shaped ends of the spring 6 can rotate smoothly relative to each other, ensuring that the fan blades 4 unfold smoothly. The other end of the spring 6 swings with a small amplitude relative to the connection point A on the swinging component. A spring hook hole 12 is used so that the other end of the spring 6 can be hooked on the spring hook hole 12. Similarly, this can ensure that the other end of the spring 6 swings smoothly relative to the connection point A on the swinging component. When the fan that can retract the fan blades 4 is not working, under the action of the spring 6 and the fan blade limiting mechanism 5 set at the rotating end of the fan blades 4, the fan blades 4 are in the retracted state. The rotation axis C of the two fan blades 4, the spring connection point B of the two springs 6 on the fan blades 4 and the connection point A of the two springs 6 on the rod 7 are on a straight line. The distance from the spring connection point B of the spring 6 on the fan blades 4 to the connection point A of the spring 6 on the rod 7 is the smallest. At this time, the protrusion 502 stops at one end of the arc-shaped groove 501.

[0016] Preferably, the oscillating element is a rod-shaped object 7, and there are two fan blades 4. The connection point A is located at both ends of the rod-shaped object 7. There are two fan blades 4, and the motor shaft 7 of the motor 2 passes through the rod-shaped object 7. When the two fan blades 4 are in the retracted state, the two fan blades 4 stop at the retracted stop position of the fan blade limiting mechanism 5. At this time, the rotation axis C of the two fan blades 4, the spring connection point B of the two springs 6 on the fan blades 4, and the connection point A of the two springs 6 on the rod-shaped object 7 are on a straight line.

[0017] When a fan with retractable blades is in operation, under the action of centrifugal force, the fan blades 4 unfold, driving the upper rotating component 903 and the lower rotating component 904 to rotate against the tension of the spring 6. This causes the protrusion 502 to move from one end of the arc-shaped groove 501 to the other end. At this time, the forces acting on the fan blades 4 include centrifugal force, the tension of the spring 6, and wind resistance. Due to the manufacturing technology of the fan blades 4, the weight of each fan blade 4 will vary. These differences will lead to dynamic imbalance. During the unfolding process of the fan blades 4, the dynamic balance will be automatically adjusted by the extent of the unfolding. When one fan blade 4 is heavier than another fan blade 4, the extent of unfolding of one fan blade 4 will be greater than that of the other fan blade 4. The small unfolding amplitude balances the centrifugal force on the two fan blades 4. At the same time, since the two fan blades 4 unfold through the linkage of the two springs 6 and the rod 7, the unfolding amplitude of the two fan blades 4 is basically the same, achieving the effect of synchronous unfolding. The larger the unfolding amplitude of the fan blades 4, the greater the tension of the matching spring 6, and vice versa. At this time, by rotating and moving the rod 7, the angle between the line connecting the rotation axis C of the fan blades 4 to the spring connection point B on the fan blades 4 and the spring 6 is adjusted, so that the torque of the two springs 6 on the two fan blades 4 is the same, achieving dynamic balance. At the same time, the two fan blades 4 with different unfolding amplitudes also maintain stable unfolding, thus ensuring the stability of dynamic balance. Since the fan blades 4 are made of lightweight plastic, they are lightweight and have low centrifugal force. The two fan blades 4 will not extend to the limit position at the same time (i.e., the protrusion 502 moves and moves against the other end of the arc groove 501). Even if the weights of the two fan blades 4 are different, dynamic balance can be achieved by the different extension ranges of the two fan blades 4, that is, adaptive dynamic balance can be achieved.

[0018] Example 2: Figure 5 , 6 As shown, this embodiment is based on embodiment 1. There are three fan blades 4 that are symmetrically rotated and connected to the fan blade disk 3. The swinging component is an equilateral triangle ring 13. When the fan blades 4 are in the retracted state, the line connecting the rotation axis C of each fan blade 4, the spring connection point B of the spring 6 on the fan blade 4, and the connection point A of the spring 6 at the corner of the equilateral triangle ring 13 is a straight line. The extension of this straight line intersects the axis of the motor 2.

[0019] When the fan that can retract the fan blades is not working, under the action of the spring 6 and the fan blade limiting mechanism 5 set at the rotating end of the fan blade 4, the fan blade 4 is in the retracted state. The line connecting the rotation axis C of each fan blade 4, the spring connection point B of the spring 6 on the fan blade 4 and the connection point A of the spring 6 at the corner of the equilateral triangle ring 13 is a straight line. The extension of this straight line intersects the axis of the motor 2. The distance from the spring connection point B of the spring 6 on the fan blade 4 to the connection point A of the spring 6 at the corner of the equilateral triangle ring 13 is the smallest. When the fan with retractable fan blades is working, under the action of centrifugal force, the fan blades 4 unfold. The fan blades 4 rotate and unfold along the rotation axis A of the fan blades 4. The distance between the spring connection point B on the fan blades 4 and the connection point A of the spring 6 at the corner of the equilateral triangle ring 13 gradually increases. Under the action of the elastic force of the spring 6, the equilateral triangle ring 13 rotates along its center of gravity O, so that the spring connection points B on the fan blades 4, the connection points A at the corner of the equilateral triangle ring 13, and the axis of the motor 2 are always aligned. The rotation axis C of blade 4 is the same distance from the spring 6 to the spring connection point B on each fan blade 4. The distance from the spring connection point B on each fan blade 4 to the connection point A on the corner of the equilateral triangle ring 13 is also basically the same. Moreover, they are all linked by the transmission of spring 6 and equilateral triangle ring 13. Therefore, the rotation angle of each fan blade 4 is the same, thus ensuring that each fan blade 4 unfolds synchronously. Due to the adaptive dynamic balance, even without the dynamic balance adjustment process of the fan blade 4, the unfolded fan runs smoothly.

[0020] Example 3: As Figure 7 , 8 As shown, this embodiment is based on embodiment 1. There are four fan blades 4 symmetrically rotated and connected to the fan blade disk 3 (in a cross shape). The swinging component is a ring 14 (of course, an equilateral quadrilateral ring can also be used). When the fan blades 4 are in the retracted state, the line connecting the rotation axis C of each fan blade 4, the spring connection point B of the spring 6 on the fan blade 4, and the connection point A of the spring 6 on the ring 14 is a straight line. The extension of this straight line intersects the axis of the motor 2.

[0021] When the fan that can retract the fan blades is not working, under the action of the spring 6 and the fan blade limiting mechanism 5 set at the rotating end of the fan blade 4, the fan blade 4 is in the retracted state. The rotation axis C of each fan blade 4, the line connecting the spring 6 on the fan blade 4 at the spring connection point B and the spring 6 on the ring 14 at the connection point A are in a straight line. The extension of this straight line intersects the axis of the motor 2. The distance from the spring 6 on the fan blade 4 at the spring connection point B to the spring 6 on the ring 14 at the minimum is the smallest. When the fan that can retract its blades is working, under the action of centrifugal force, the fan blades 4 unfold. The fan blades 4 rotate and unfold along the rotation axis C of the fan blades 4. The distance between the spring connection point B on the fan blades 4 and the connection point A on the ring 14 of the spring 6 gradually increases. Under the action of the elastic force of the spring 6, the ring 14 rotates around its center (center of gravity O), so that the spring connection points B on the fan blades 4, the connection points A on the ring 14 of the spring 6, and the axis of the motor 2 are always in a straight line. Under the linkage of the springs and the ring 14, the rotation angle of each fan blade 4 is basically the same, thus ensuring that each fan blade 4 unfolds synchronously.

[0022] Example 4: Figure 7 As shown, this embodiment is based on the above embodiment, and includes a lamp holder 15 (disc-shaped object) for mounting an electric light source. The lamp holder 15 is located below the fan blade disk 3 and is connected to the motor shaft 7. A spring 6 connects the rotating component 9 and the oscillating component, which is located between the fan blade disk 3 and the lamp holder 15. The lamp holder 15 serves two purposes: firstly, it provides illumination, enriching the fan's functionality; secondly, the cooperation between the fan blades 4 and the lamp holder 15 enhances the aesthetics of the lower part of the fan.

[0023] Preferably, the oscillating component is an equal quadrilateral ring 16, and the fan blade disk 3 is cap-shaped. The central part 301 of the cap is a dome-shaped structure for accommodating the motor 2. The brim 302 of the cap-shaped fan blade disk 3 is approximately square in shape, and the mounting holes 10 of the fan blade disk 3 are located at the four corners of the brim 302 of the approximately square fan blade disk 3. By using a cap-shaped fan blade disk 3, the various components are effectively protected, preventing them from being exposed and damaged. Furthermore, the components are also effectively decorated, enhancing the overall aesthetics of the fan.

Claims

1. A fan capable of housing fan blades, comprising a suspension rod, a motor connected to the bottom end of the suspension rod, a fan blade disk driven by the motor shaft, and two or more fan blades symmetrically rotatably connected to the fan blade disk, characterized in that: The device is equipped with a swinging component, which has the same number of connection points as the number of fan blades. When the center of gravity of the swinging component is located on the axis of rotation of the motor, the vertical distance between each connection point and the axis of rotation is the same. The fan blades are equipped with spring connection points, and each connection point on the swinging component is connected to the spring connection point on the matching fan blade. The vertical distance between the spring connection point on each fan blade and the axis of rotation of that fan blade is the same. The fan blade includes a fan blade body and a rotating component mounted on the fan blade disk. The rotating component includes a slip ring component fixed on the mounting hole of the fan blade disk and a rotating part. The rotating part is positioned on the slip ring component and rotates relative to the slip ring component. A spring connects the rotating part and the oscillating part. A non-circular hole is provided on the rotation axis of the rotating part. A matching non-circular post is provided on the fan blade body. The non-circular post is embedded in the non-circular hole and fixed with screws, so that the fan blade body is subsequently fixed on the rotating part.

2. The fan capable of retracting fan blades according to claim 1, characterized in that: The slip ring component includes an upper slip ring and a lower slip ring, which are respectively positioned at both ends of the mounting hole of the fan blade disk. The rotating component includes an upper rotating part rotatably mounted on the upper slip ring and a lower rotating part rotatably mounted on the lower slip ring. At least one of the middle parts of the upper rotating part and the lower rotating part is provided with a short shaft. The short shaft is rotatably connected to the hole of the upper slip ring and the lower slip ring. The upper rotating part and the lower rotating part are connected together, so that the upper rotating part and the lower rotating part are respectively positioned on the outside of the upper slip ring and the lower slip ring. The short shaft allows the upper rotating part and the lower rotating part to be rotatably mounted on the upper slip ring and the lower slip ring. A non-circular hole is provided in the middle of the upper rotating part. A non-circular post matching the non-circular hole is provided at the connecting end of the fan blade body. The non-circular post passes through the middle of the lower rotating part and is inserted into the non-circular hole provided in the middle of the upper rotating part and connected in the non-circular hole. A spring is connected between the upper rotating part and the oscillating part.

3. The fan capable of retracting fan blades according to claim 2, characterized in that: A fan blade limiting mechanism is provided, which includes an arc-shaped groove on the hole wall of the upper and lower sliding rings and a protrusion on the outer wall of the short shaft. The arc-shaped groove limits the sliding distance of the protrusion, thereby limiting the rotation angle of the upper and lower rotating parts, and thus limiting the position of the fan blade body when unfolded or retracted.

4. The fan capable of retracting fan blades according to claim 1, 2, or 3, characterized in that: The oscillating component is a rod-shaped object, and the fan blades are two pieces, with the connection point located at both ends of the rod-shaped object.

5. The fan capable of retracting fan blades according to claim 1, 2, or 3, characterized in that: The oscillating component is an equilateral polygonal ring, a circular ring, an equilateral polygonal disk, or a disc. The number of sides of the equilateral polygonal ring or the equilateral polygonal disk matches the number of fan blades. The connection point is located at the corner of the equilateral polygonal ring, or at the corner of the equilateral polygonal disk, or the connection point is symmetrically arranged on the circular ring.

6. The fan capable of retracting fan blades according to claim 5, characterized in that: A lamp holder for mounting an electric light source is provided. The lamp holder is located below the fan blade disk and is connected to the motor shaft. A spring is connected between the rotating component and the oscillating component. The oscillating component is located between the fan blade disk and the lamp holder.

7. The fan capable of retracting fan blades according to claim 6, characterized in that: The oscillating component is an equal quadrilateral ring, and the fan blade disk is cap-shaped. The center of the cap is a dome-shaped structure for accommodating the motor. The brim of the cap-shaped fan blade disk is approximately square in shape, and the mounting holes of the fan blade disk are located at the four corners of the brim of the approximately square fan blade disk.

8. The fan capable of retracting fan blades according to claim 2, 3, 6, or 7, characterized in that: In the production area, the rotating components are fixedly connected to the fan blade disk, and in the usage area, the suspension rod, motor, fan blade disk, and fan blades are fixedly connected together.

Images