Energy-saving fan with double-layer sandwich cavity type noise reduction shell structure

Abstract

The invention relates to the technical field of centrifugal fans, in particular to an energy-saving fan with a double-layer sandwich cavity type noise reduction shell structure, which comprises a double-layer shell, fan blades arranged in the double-layer shell, a driving motor arranged on the outer side of the double-layer shell and connected with the fan blades, and a shaft I rotationally connected to the double-layer shell and fixed with the fan blades, an output shaft of the driving motor is connected with the first shaft, a power storage assembly connected with the output shaft of the driving motor is arranged on the double-layer shell, and when the draught fan works normally, the driving motor drives the fan blades to rotate at the set rotating speed and meanwhile is connected with the power storage assembly to complete energy storage; after the force storage assembly reaches a preset energy storage state, the driving motor accelerates and is separated from the force storage assembly, so that the force storage assembly keeps energy storage standby, and the device can synchronously complete energy storage during normal ventilation, automatically starts emergency ventilation after power failure or failure, guarantees ventilation continuity, is high in overall structure adaptability, and has the dual advantages of noise reduction and emergency guarantee.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan technology, specifically to an energy-saving fan with a double-layer sandwich cavity noise-reducing shell structure. Background Technology

[0002] In the prior art, centrifugal fans typically adopt a double-layer sandwich cavity noise reduction shell structure to reduce the noise generated by internal components during operation. This structure mainly includes an impeller, a motor, and a volute. A rectangular outer shell is set on the outside of the volute, so that a double-layer sandwich cavity is formed between the volute and the outer shell. Sound-absorbing materials can be arranged in the cavity, achieving noise reduction and energy saving while ensuring the aerodynamic efficiency of the fan.

[0003] However, existing centrifugal fans are mostly used in ventilation scenarios, and their blades are entirely driven by a motor. In actual operation, if the motor fails or there is an unexpected power outage, the motor's output torque will immediately disappear, the blades will stop rotating within a short time, and the fan will completely lose its ventilation capacity. For places requiring continuous ventilation, such as enclosed equipment compartments, underground spaces, and kitchen exhaust systems, sudden interruptions in ventilation can easily lead to heat accumulation and the inability to expel harmful gases, posing safety hazards and resulting in low overall safety and reliability. Therefore, we propose an energy-saving fan with a double-layer sandwich cavity-type noise-reducing shell structure. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides an energy-saving fan with a double-layer sandwich cavity noise-reducing shell structure. The fan includes a double-layer shell and fan blades housed within the double-layer shell. A drive motor connected to the fan blades is located on the outer side of the double-layer shell. It also includes a shaft rotatably connected to the double-layer shell and fixedly connected to the fan blades. The output shaft of the drive motor is connected to the shaft. A power storage assembly connected to the output shaft of the drive motor is located on the double-layer shell. During normal operation, the drive motor rotates the fan blades at a certain speed while simultaneously engaging with the power storage assembly to store energy. When the power storage assembly reaches a preset energy storage state, the drive motor accelerates and disengages from the power storage assembly, maintaining its energy storage and standby status. When the drive motor malfunctions or experiences an unexpected power outage, the power storage assembly automatically engages with the fan blades, releasing the stored mechanical energy and continuing to drive the fan blades to rotate for a period of time, providing emergency ventilation and allowing time for maintenance and safety procedures.

[0005] In some embodiments, the energy storage component includes a hollow tube fixedly connected to a double-layered shell, one end of the hollow tube being rotatably connected to an annulus, a hollow column being rotatably connected to a shaft, and a coil spring being provided between the hollow column and the annulus, with both ends of the coil spring being fixedly connected to the hollow column and the annulus, respectively.

[0006] A hollow shaft two is rotatably connected to the output shaft of the drive motor. A one-way drive component is provided between the hollow shaft two and the ring body. The one-way drive component is used to drive the ring body to rotate when the hollow shaft two rotates.

[0007] A connecting piece is provided between the hollow shaft 2 and the output shaft of the drive motor. The connecting piece is used to engage the output shaft with the hollow shaft 2 for transmission when the drive motor rotates at medium speed, and to disconnect the transmission connection between the output shaft and the hollow shaft 2 when the drive motor rotates at high speed.

[0008] A ratchet assembly is provided between the hollow column and the shaft, which is used to drive the shaft to rotate when the hollow column rotates. A ratchet assembly is also provided between the output shaft of the drive motor and the shaft, which is used to drive the shaft to rotate when the drive motor rotates.

[0009] The hollow tube is equipped with a locking component that cooperates with the hollow column and the shaft. The locking component is used to lock the hollow column and the double-layer shell when the drive motor drives the shaft to rotate at a medium speed, and to release the lock on the hollow column when the shaft speed is lower than the medium speed.

[0010] In some embodiments, the unidirectional drive includes an external gear ring fixedly connected to one end of the annular body, a shaft three rotatably connected to the hollow tube, and a gear that meshes with the external gear ring fixedly connected to the shaft three, so that rotating the shaft three drives the annular body to rotate.

[0011] An L-shaped plate is fixedly connected to the double-layered shell. One end of the third shaft is rotatably connected to the L-shaped plate, and a worm gear is fixedly connected to the third shaft. A fourth shaft is rotatably connected to the L-shaped plate. One end of the fourth shaft is fixedly connected to a worm gear that meshes with the worm gear. One end of the hollow second shaft is fixedly connected to a helical gear disk, and the other end of the fourth shaft is fixedly connected to a helical gear disk that meshes with the helical gear disk. Rotating the hollow second shaft drives the third shaft to rotate.

[0012] In some embodiments, the docking member includes an annular protrusion fixedly connected to the hollow shaft II, the annular protrusion having a slot, a cylinder fixedly connected to the output shaft of the drive motor, one end of the cylinder being hollow, the annular protrusion being located inside the cylinder and slidably connected to its inner wall, and a locking pin being slidably connected to the cylinder, one end of the locking pin being located inside the slot, for connecting the cylinder and the hollow shaft II;

[0013] A rectangular magnet is fixedly connected to one end of the locking pin, and a U-shaped frame is fixedly connected to the cylinder. A rectangular magnet is also fixedly connected inside the U-shaped frame. The two rectangular magnets face each other with a gap. The two rectangular magnets have the same magnetism when they face each other. This is used to ensure that the locking pin is located in the slot when the drive motor rotates at medium speed.

[0014] In some embodiments, the locking member includes a sliding tube sleeved on a shaft, a hollow cylinder rotatably connected to the sliding tube, and a plurality of protrusions 1 uniformly fixedly connected to one end of the hollow cylinder, and a plurality of protrusions 2 uniformly fixedly connected to one end of the hollow cylinder, and the hollow cylinder is moved so that the plurality of protrusions 1 are correspondingly embedded in the gaps of the plurality of protrusions 2 to lock the hollow cylinder.

[0015] Furthermore, a connecting plate is fixedly connected to one side of the hollow cylinder, and a sliding rod with one end sliding through the connecting plate is fixedly connected to the double-layer shell.

[0016] In some embodiments, a deflection plate is rotatably connected to the shaft via a rotating shaft. A counterweight is fixedly connected to one end of the deflection plate, and a connecting rod is rotatably connected between the deflection plate and the sliding tube. A spring is sleeved on the shaft, and both ends of the spring are fixed to the sliding tube and the shaft, respectively. When the drive motor drives the shaft to rotate at a medium speed, the centrifugal force is used to drive the deflection plate to deflect, thereby driving the sliding tube to move, so as to drive the hollow cylinder to move relative to the hollow column.

[0017] The present invention has at least the following beneficial effects:

[0018] When the drive motor is running normally, this device can store energy in the energy storage component while driving the fan blades for ventilation. After the energy storage is completed, the motor speeds up and disengages from the energy storage component, keeping the energy storage component in a standby state. Once the drive motor malfunctions or there is an unexpected power outage, the energy storage component can automatically engage with the fan blades and release mechanical energy to continue driving the fan blades to rotate for a certain period of time, achieving uninterrupted emergency ventilation. This avoids safety hazards such as heat accumulation and inability to expel harmful gases caused by sudden interruption of ventilation, significantly improving the safety and reliability of the fan. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 Schematic diagram of partial cross-section;

[0021] Figure 3 For the present invention Figure 2 Schematic diagram of partial cross-section;

[0022] Figure 4 For the present invention Figure 3 Schematic diagram of partial cross-section;

[0023] Figure 5 For the present invention Figure 4 Schematic diagram of partial cross-section;

[0024] Figure 6 For the present invention Figure 5 Another structural diagram;

[0025] Figure 7 For the present invention Figure 5 Schematic diagram of partial cross-section;

[0026] Figure 8 For the present invention Figure 7 Schematic diagram of partial cross-section;

[0027] Figure 9 For the present invention Figure 8 Schematic diagram of the structure of area A in the middle;

[0028] Figure 10 For the present invention Figure 8 Schematic diagram of the exploded structure.

[0029] In the diagram: 1-Double-layer shell; 11-Fan blade; 12-Drive motor; 2-Shaft 1; 3-Power storage assembly; 31-Hollow tube; 32-Ring; 33-Hollow column; 34-Disc spring; 35-Hollow shaft 2; 36-One-way drive component; 37-Connecting component; 38-Ratchet and ratchet assembly; 39-Locking component; 41-External gear ring; 42-Shaft 3; 43-Gear; 44-L-shaped plate; 45-Worm gear; 46-Shaft 4; 47-Worm; 48-Helical Gear 1; 49-Helical Gear 2; 51-Annular Protrusion; 52-Slot; 53-Cylinder; 54-Pin; 55-Rectangular Magnet; 56-U-shaped Frame; 57-Sliding Tube; 58-Hollow Cylinder; 59-Protrusion 1; 61-Protrusion 2; 62-Connecting Plate; 63-Slide Rod; 64-Deflection Plate; 65-Counterweight; 66-Connecting Rod; 67-Spring. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1-10This invention provides a technical solution: an energy-saving fan with a double-layer sandwich cavity noise-reducing shell structure, comprising a double-layer shell 1 and fan blades 11 disposed within the double-layer shell 1. A drive motor 12 connected to the fan blades 11 is disposed on the outer side of the double-layer shell 1. A mounting base is fixedly connected to the double-layer shell 1, and the drive motor 12 is fixedly connected to the mounting base. It also includes a shaft 2 rotatably connected to the double-layer shell 1 and fixedly connected to the fan blades 11. The output shaft of the drive motor 12 is connected to the shaft 2. The double-layer shell 1 is provided with a connection to the output shaft of the drive motor 12. When the fan is working normally, the drive motor 12 drives the fan blades 11 to rotate at a certain speed and engages with the energy storage component 3 to store energy. When the energy storage component 3 reaches the preset energy storage state, the drive motor 12 speeds up and disengages from the energy storage component 3 to keep it in standby mode. When the drive motor 12 fails or is unexpectedly powered off, the energy storage component 3 automatically engages with the fan blades 11 to release the stored mechanical energy and continue to drive the fan blades 11 to rotate for a period of time to achieve emergency ventilation and reserve time for maintenance and safety handling.

[0032] Specifically, when the device is in the stopped state, the drive motor 12 does not rotate, the spring 67 on shaft 2 is in a relaxed state, the protrusion 59 on the hollow cylinder 58 and the protrusion 61 on the hollow column 33 are offset from each other, and the hollow column 33 can rotate freely relative to the hollow cylinder 58; at the same time, the locking pin 54 on the cylinder 53 is locked into the slot 52 of the annular protrusion 51 under the repulsive force of the two rectangular magnets 55, so that the output shaft of the drive motor 12 is connected to the hollow shaft 35.

[0033] When the drive motor 12 is started and rotated at medium speed, the centrifugal force on the locking pin 54 and the rectangular magnet 55 cannot completely overcome the magnetic repulsion. The locking pin 54 is still partially locked in the slot 52. The drive motor 12 drives the hollow shaft 35 to rotate through the cylinder 53. The hollow shaft 35 drives the shaft 46 to rotate through the cooperation of the helical gear disk 48 and the helical gear disk 49. This drives the worm 47, the worm wheel 45 and the gear 43 fixed to the shaft 42 to rotate in sequence, thereby driving the ring 32 fixed to the external gear ring 41 to rotate.

[0034] At the same time, the output shaft of the drive motor 12 drives the shaft 2 to rotate at medium speed through the ratchet assembly 38. The shaft 2 drives the deflection plate 64 to deflect and unfold. The connecting rod 66 pulls the sliding tube 57 to move and compresses the spring 67, so that the hollow cylinder 58 moves relative to the hollow column 33. The first protrusion 59 is engaged between the second protrusion 61 to lock the hollow column 33. During the rotation of the ring body 32, the disc spring 34 is driven to complete the energy storage.

[0035] After the coil spring 34 stores energy to a set level, the drive motor 12 switches to high-speed rotation. The centrifugal force on the locking pin 54 and the rectangular magnet 55 completely overcomes the magnetic repulsion force, and the locking pin 54 disengages from the slot 52. The transmission between the output shaft of the drive motor 12 and the hollow shaft 35 is disconnected. With the help of the self-locking characteristics of the worm gear 45 and worm 47, the coil spring 34 is prevented from rotating on its own, so that the coil spring 34 remains in an energy-storing standby state.

[0036] When the drive motor 12 stops and the speed of shaft 2 is lower than the medium speed, the spring 67 resets and pushes the sliding tube 57 to move. The protrusion 59 on the hollow cylinder 58 is misaligned with the protrusion 61 on the hollow column 33, and the locking of the hollow column 33 is released. The disc spring 34 releases its stored energy and drives the hollow column 33 to rotate. The hollow column 33 then drives shaft 2 to continue rotating through the ratchet and tooth assembly 38, thus achieving emergency ventilation.

[0037] In summary, when the drive motor 12 is running normally, the device can store energy in the energy storage component 3 while driving the fan blades 11 for ventilation. After the energy storage is completed, the motor speeds up and disengages from the energy storage component 3, keeping the energy storage component 3 in a standby state. Once the drive motor 12 malfunctions or experiences an unexpected power outage, the energy storage component 3 can automatically engage with the fan blades 11 and release mechanical energy to continue driving the fan blades 11 to rotate for a certain period of time, achieving uninterrupted emergency ventilation. This avoids safety hazards such as heat accumulation and inability to expel harmful gases caused by sudden interruption of ventilation, significantly improving the safety and reliability of the fan.

[0038] The power storage component 3 includes a hollow tube 31 fixedly connected to the double-layer shell 1. One end of the hollow tube 31 is rotatably connected to an annular body 32. A hollow column 33 is rotatably connected to the shaft 2. A coil spring 34 is provided between the hollow column 33 and the annular body 32. Specifically, the two ends of the coil spring 34 are fixedly connected to the hollow column 33 and the annular body 32, respectively.

[0039] A hollow shaft 35 is rotatably connected to the output shaft of the drive motor 12. A one-way drive component 36 is provided between the hollow shaft 35 and the ring body 32. The one-way drive component 36 is used to drive the ring body 32 to rotate when the hollow shaft 35 rotates.

[0040] A connecting piece 37 is provided between the hollow shaft 35 and the output shaft of the drive motor 12. The connecting piece 37 is used to engage the output shaft with the hollow shaft 35 for transmission when the drive motor 12 rotates at medium speed, and to disconnect the transmission connection between the output shaft and the hollow shaft 35 when the drive motor 12 rotates at high speed.

[0041] A ratchet assembly 38 is provided between the hollow column 33 and the shaft 2, which is used to drive the shaft 2 to rotate when the hollow column 33 rotates. A ratchet assembly 38 is also provided between the output shaft of the drive motor 12 and the shaft 2, which is used to drive the shaft 2 to rotate when the drive motor 12 rotates.

[0042] The hollow tube 31 is provided with a locking member 39 that cooperates with the hollow column 33 and the shaft 2. The locking member 39 is used to lock the hollow column 33 and the double-layer housing 1 when the drive motor 12 drives the shaft 2 to rotate at medium speed, and to release the lock on the hollow column 33 when the speed of the shaft 2 is lower than the medium speed.

[0043] The one-way drive component 36 includes an external gear ring 41 fixedly connected to one end of the ring body 32, a shaft 42 rotatably connected to the hollow tube 31, and a gear 43 fixedly connected to the shaft 42 that meshes with the external gear ring 41. When the shaft 42 is rotated, the external gear ring 41 is driven to rotate through the gear 43, which in turn drives the ring body 32 to rotate.

[0044] An L-shaped plate 44 is fixedly connected to the double-layered shell 1. One end of the shaft 3 42 is rotatably connected to the L-shaped plate 44, and a worm gear 45 is fixedly connected to the shaft 3 42. A shaft 46 is rotatably connected to the L-shaped plate 44. One end of the shaft 46 is fixedly connected to a worm 47 that meshes with the worm gear 45. One end of the hollow shaft 2 35 is fixedly connected to a helical gear disk 48, and the other end of the shaft 46 is fixedly connected to a helical gear disk 49 that meshes with the helical gear disk 48. When the hollow shaft 2 35 is rotated, it drives the helical gear disk 48 to rotate, which in turn drives the helical gear disk 49 to rotate, which in turn drives the shaft 46 to rotate, which in turn drives the worm gear 45 that meshes with the worm 47 to rotate, thereby driving the shaft 3 42 to rotate.

[0045] The docking component 37 includes an annular protrusion 51 fixedly connected to the hollow shaft 35. The annular protrusion 51 has a slot 52. A cylinder 53 is fixedly connected to the output shaft of the drive motor 12. One end of the cylinder 53 is hollow. The annular protrusion 51 is located inside the cylinder 53 and is slidably connected to its inner wall. A locking pin 54 is slidably connected to the cylinder 53. When one end of the locking pin 54 is located in the slot 52, it is used to connect the cylinder 53 and the hollow shaft 35.

[0046] A rectangular magnet 55 is fixedly connected to one end of the locking pin 54. A U-shaped frame 56 is fixedly connected to the cylinder 53. A rectangular magnet 55 is also fixedly connected inside the U-shaped frame 56. The two rectangular magnets 55 face each other with a gap. The two rectangular magnets 55 have the same magnetism when they face each other. This is used to ensure that the locking pin 54 is located in the slot 52 when the drive motor 12 rotates at medium speed. Conversely, when the drive motor 12 rotates at high speed, the centrifugal force drives the locking pin 54 to move and pull it out of the slot 52.

[0047] The locking component 39 includes a sliding tube 57 sleeved on the shaft 2. A hollow cylinder 58 is rotatably connected to the sliding tube 57, and a plurality of protrusions 59 are uniformly fixedly connected to one end of the hollow cylinder 58. One end of the hollow column 33 is located inside the hollow cylinder 58 and is uniformly fixedly connected to a plurality of protrusions 61. A connecting plate 62 is fixedly connected to one side of the hollow cylinder 58. A sliding rod 63 with one end sliding through the connecting plate 62 is fixedly connected to the double-layer shell 1. The hollow cylinder 58 is moved relative to the sliding rod 63 so that the plurality of protrusions 59 are correspondingly embedded in the gaps of the plurality of protrusions 61, thereby locking the hollow column 33 and the double-layer shell 1.

[0048] A deflection plate 64 is rotatably connected to shaft 2 via a rotating shaft. A counterweight 65 is fixedly connected to one end of the deflection plate 64. A connecting rod 66 is rotatably connected between the deflection plate 64 and the sliding tube 57 via a rotating shaft. A spring 67 is sleeved on shaft 2. The two ends of the spring 67 are fixedly connected to the sliding tube 57 and shaft 2 respectively. When the drive motor 12 drives shaft 2 to rotate at a medium speed, the deflection plate 64 is deflected by centrifugal force, which in turn drives the sliding tube 57 to move, thereby driving the hollow cylinder 58 to move relative to the hollow cylinder 33. At the same time, the spring 67 is compressed to provide self-recovering force.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. An energy-saving fan with a double-layer sandwich cavity noise-reducing shell structure, comprising a double-layer shell (1) and fan blades (11) disposed within the double-layer shell (1), wherein a drive motor (12) connected to the fan blades (11) is provided on the outer side of the double-layer shell (1), characterized in that, It also includes: Shaft 1 (2) is rotatably connected to the double-layer housing (1) and fixed to the fan blade (11). The output shaft of the drive motor (12) is connected to shaft 1 (2). The power storage component (3) is mounted on the double-layer housing (1) and connected to the output shaft of the drive motor (12); When the fan is working normally, the drive motor (12) drives the fan blade (11) to rotate at a certain speed and engages with the energy storage component (3) to store energy in the energy storage component (3). When the energy storage component (3) reaches the preset energy storage state, the drive motor (12) speeds up and disengages from the energy storage component (3) to keep it in standby mode. When the drive motor (12) fails or is unexpectedly powered off, the energy storage component (3) automatically engages with the fan blade (11) to release the stored mechanical energy and continue to drive the fan blade (11) to rotate for a period of time to achieve emergency ventilation and reserve time for maintenance and safety handling.

2. The energy-saving fan with a double-layer sandwich cavity noise-reducing shell structure according to claim 1, characterized in that: The energy storage component (3) includes a hollow tube (31) fixedly connected to the double-layer shell (1), one end of the hollow tube (31) is rotatably connected to an annular body (32), a hollow column (33) is rotatably connected to the shaft (2), and a coil spring (34) is provided between the hollow column (33) and the annular body (32), with both ends of the coil spring (34) fixedly connected to the hollow column (33) and the annular body (32) respectively; A hollow shaft 2 (35) is rotatably connected to the output shaft of the drive motor (12). A one-way drive member (36) is provided between the hollow shaft 2 (35) and the ring body (32). The one-way drive member (36) is used to drive the ring body (32) to rotate when the hollow shaft 2 (35) rotates. A coupling part (37) is provided between the hollow shaft 2 (35) and the output shaft of the drive motor (12). The coupling part (37) is used to engage the output shaft with the hollow shaft 2 (35) for transmission when the drive motor (12) rotates at medium speed, and to disconnect the transmission connection between the output shaft and the hollow shaft 2 (35) when the drive motor (12) rotates at high speed. A ratchet assembly (38) is provided between the hollow column (33) and the shaft (2) to drive the shaft (2) to rotate when the hollow column (33) rotates. A ratchet assembly (38) is also provided between the output shaft of the drive motor (12) and the shaft (2) to drive the shaft (2) to rotate when the drive motor (12) rotates. The hollow tube (31) is provided with a locking member (39) that cooperates with the hollow column (33) and the shaft (2). The locking member (39) is used to lock the hollow column (33) and the double-layer shell (1) when the drive motor (12) drives the shaft (2) to rotate at medium speed, and to release the lock on the hollow column (33) when the speed of the shaft (2) is lower than the medium speed.

3. The energy-saving fan with a double-layer sandwich cavity noise-reducing shell structure according to claim 2, characterized in that: The one-way drive component (36) includes an external gear ring (41) fixedly connected to one end of the ring body (32), a shaft three (42) rotatably connected to the hollow tube (31), and a gear (43) meshing with the external gear ring (41) fixedly connected to the shaft three (42). When the shaft three (42) is rotated, it drives the ring body (32) to rotate. An L-shaped plate (44) is fixedly connected to the double-layer shell (1). One end of the shaft three (42) is rotatably connected to the L-shaped plate (44), and a worm gear (45) is fixedly connected to the shaft three (42). A shaft four (46) is rotatably connected to the L-shaped plate (44). A worm (47) that meshes with the worm gear (45) is fixedly connected to one end of the shaft four (46). A helical gear disk one (48) is fixedly connected to one end of the hollow shaft two (35), and a helical gear disk two (49) that meshes with the helical gear disk one (48) is fixedly connected to the other end of the shaft four (46). When the hollow shaft two (35) is rotated, the shaft three (42) is driven to rotate.

4. The energy-saving fan with a double-layer sandwich cavity noise-reducing shell structure according to claim 3, characterized in that: The docking component (37) includes an annular protrusion (51) fixedly connected to the hollow shaft (35), and a slot (52) is provided on the annular protrusion (51). A cylinder (53) is fixedly connected to the output shaft of the drive motor (12). One end of the cylinder (53) is hollow. The annular protrusion (51) is located inside the cylinder (53) and is slidably connected to its inner wall. A locking pin (54) is slidably connected to the cylinder (53). One end of the locking pin (54) is located inside the slot (52) and is used to connect the cylinder (53) and the hollow shaft (35). A rectangular magnet (55) is fixedly connected to one end of the latch (54), and a U-shaped frame (56) is fixedly connected to the cylinder (53). A rectangular magnet (55) is also fixedly connected inside the U-shaped frame (56). The two rectangular magnets (55) face each other and have a gap. The two rectangular magnets (55) have the same magnetism when they face each other. This is used to ensure that the latch (54) is located in the slot (52) when the drive motor (12) rotates at medium speed.

5. The energy-saving fan with a double-layer sandwich cavity noise-reducing shell structure according to claim 4, characterized in that: The locking component (39) includes a sliding tube (57) sleeved on the shaft (2), a hollow cylinder (58) is rotatably connected to the sliding tube (57), and a plurality of protrusions (59) are uniformly fixedly connected to one end of the hollow cylinder (58). One end of the hollow column (33) is located inside the hollow cylinder (58) and a plurality of protrusions (61) are uniformly fixedly connected to it. The hollow cylinder (58) is moved so that the plurality of protrusions (59) are correspondingly embedded in the gaps of the plurality of protrusions (61) to lock the hollow column (33). Furthermore, a connecting plate (62) is fixedly connected to one side of the hollow cylinder (58), and a sliding rod (63) with one end sliding through the connecting plate (62) is fixedly connected to the double-layer shell (1).

6. The energy-saving fan with a double-layer sandwich cavity noise-reducing shell structure according to claim 5, characterized in that: A deflector plate (64) is rotatably connected to the shaft (2) via a rotating shaft. A counterweight (65) is fixedly connected to one end of the deflector plate (64), and a connecting rod (66) is rotatably connected between the deflector plate (64) and the sliding tube (57). A spring (67) is sleeved on the shaft (2). The two ends of the spring (67) are fixed to the sliding tube (57) and the shaft (2) respectively. When the drive motor (12) drives the shaft (2) to rotate at a medium speed, the centrifugal force drives the deflector plate (64) to deflect, thereby driving the sliding tube (57) to move, so as to drive the hollow cylinder (58) to move relative to the hollow cylinder (33).

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