Fan brake structure

Abstract

The present invention provides a fan brake structure, comprising: a fan, a brake device; the fan has a frame, a fan wheel and a stator, the frame is vertically provided with a shaft cylinder, the fan wheel is vertically provided with an axis pivotally arranged in the aforementioned shaft cylinder, the stator is sleeved on the outside of the shaft cylinder and corresponds to the fan wheel, and one end of the axis has a first limiting portion; the brake device is arranged at the bottom of the shaft cylinder and has a driving part, a braking part and an elastic part, the elastic part supports one end of the braking part, and the other end of the braking part has a convex body, the driving part has a spiral track, when the driving part rotates, the convex body moves corresponding to the spiral track, so that the brake part can perform a linear reciprocating motion of rising to clamp the first limiting part of the shaft to lock the brake or descending to disengage from the first limiting part of the shaft to release the brake, thereby achieving the braking or releasing brake effect.

Description

Technical Field

[0001] The present invention relates to a fan brake structure, and in particular to a fan brake structure with better braking effect and power saving. Background Art

[0002] The use of fans as a cooling tool is a trend in many consumer products. When an electronic product's temperature is too high, a fan activates to cool the entire device. Once the temperature drops to a certain level, the fan stops. Traditionally, to prevent electronic products from burning out due to overheating, a cooling fan is often included as a protective device. To cope with the increasing speed of components, fan speed requirements are increasing. Consequently, when a fan is running at high speed and power is lost, it will continue to run for a period of time due to inertia before completely stopping.

[0003] Existing braking technologies for DC fans are primarily implemented on circuit boards, with three possible implementations. The first, power-on braking, can be implemented using software. When powered on, the fan's microprocessor (MCU) controls an H-bridge motor driver circuit, keeping two lower-arm MOS transistors permanently open. This causes the fan's blades to generate a magnetic field, which counteracts the magnetic field of the magnetic tape, creating resistance and thus braking. The second, power-off braking, is implemented in hardware. When the fan is powered off, the inertia of the fan blades generates an electromotive force that is fed into the fan's internal motor-driven braking circuit, causing two lower-arm MOS transistors to remain open. This allows the magnetic field generated by the fan's blades to counteract the magnetic field of the magnetic tape, creating resistance and thus braking. The third, a solenoid-controlled braking mechanism, uses power directly from the fan's power supply to the solenoid valve. The solenoid valve remains open during normal fan operation and is deactivated only when the fan is powered off, thus achieving braking. This approach requires a longer period of solenoid valve power.

[0004] Therefore, existing fan braking technology requires the addition of an additional braking circuit or the installation of a microprocessor with a braking mode function on the fan's original circuit board in order to achieve a braking effect. However, the aforementioned circuit braking method can only wait for the multiple fan blades that are still running to slowly stop rotating, and cannot accelerate the fan blades to stop rotating in a short time or immediately. In other words, it is impossible to shorten the time between the circuit braking structure losing power and completely stopping, and then restart the fan to operate and dissipate heat. This not only reduces work efficiency, but also easily causes shaking and self-rotation before it completely stops, thereby increasing the occurrence of work hazards. Secondly, the fan's original circuit board already has several components with existing functions and the connecting wiring between them, which will make it impossible to directly add the braking circuit to the original circuit board. The industry must use a new circuit board and modify the design of the original circuit board before adding the braking circuit. This not only increases the cost of use, but also makes the above-mentioned existing fan braking method less shared. Summary of the Invention

[0005] In order to effectively solve the above problems, the main purpose of the present invention is to provide a fan brake structure, through which the first and second brake modules in a brake device can be linked and pushed together when a fan is powered off, thereby locking the first brake module relative to the axis or separating to release the braking effect.

[0006] Another object of the present invention is to provide a fan brake structure that can improve work efficiency and reduce work hazards.

[0007] Another object of the present invention is to provide a fan brake structure that uses electricity only during the brake switching process, thereby reducing power consumption, lowering usage costs, and conforming to energy-saving development.

[0008] To achieve the above-mentioned object, the present invention provides a fan brake structure, characterized by comprising:

[0009] A fan having a frame, a fan wheel and a stator, wherein a shaft cylinder is vertically provided on the frame, the fan wheel is vertically provided with an axis and is pivotally mounted in the shaft cylinder, the stator is sleeved on the outside of the shaft cylinder and corresponds to the fan wheel, and one end of the axis cylinder has a first limiting portion; and

[0010] A brake device is provided at the bottom of the shaft tube and electrically connected to a circuit board. The brake device has a driving part, a brake part and an elastic part. The elastic part supports one end of the brake part, and the other end of the brake part has a convex body. The driving part has a spiral track. When the driving part rotates, the convex body moves corresponding to the spiral track, causing the brake part to rise and clamp the first limiting part of the shaft center to lock the brake or fall and release the brake through the push of the elastic part, performing a linear reciprocating motion.

[0011] The fan brake structure described, wherein: the brake device has a power part and a base, the base is arranged at the bottom end of the shaft cylinder, the power part is arranged at a bottom of the base and is axially connected to the driving part and electrically connected to the circuit board to drive the driving part to rotate, the brake part is arranged in the base and has a lower surface and an upper surface, the lower surface and the upper surface respectively have the convex body and a second limiting part, and the second limiting part is clamped or separated from the first limiting part, the elastic part is arranged in the base and has a first brake spring part and a second brake spring part, the first brake spring part is fixed at an upper end of the base, the second brake spring part is arranged on the upper surface of the brake part and expands and pushes toward the driving part under normal conditions, so that the convex body of the brake part contacts the driving part.

[0012] The fan brake structure described, wherein: the axis has a free end, the free end passes through the shaft tube, the first limiting portion is a groove concave inward from the end of the free end, and the second limiting portion is a clamping block extended outward from the upper surface of the brake member, so that the second limiting portion can be embedded in and clamped into the first limiting portion, and the brake member moves back and forth in a straight line relative to the base, so that the second limiting portion clamps the first limiting portion relative to or separates from the first limiting portion.

[0013] The fan brake structure described above, wherein: the power component of the brake device is an electric motor with a rotor, the driving component is axially arranged on the upper side of the power component, the spiral track is located on the other side surface of the driving component and is provided with a first top control area and a second top control area, the first top control area and the second top control area are at different heights from each other and are connected to form a spiral surface.

[0014] In the fan brake structure, the rotor of the power member drives the driving member to rotate toward a first position, the protrusion of the brake member moves to a position relative to the first pressing area via the spiral surface of the driving member and is pushed, and the brake member is restricted from moving upward relative to the base, so that the second limiting portion is engaged with the first limiting portion and compresses the elastic member.

[0015] The fan brake structure is described, wherein: the rotor of the power member drives the driving member to rotate toward a second position, the convex body of the brake member moves to a position relative to the second top control area via the spiral surface of the driving member, and the brake member is not pushed, so that the elastic member is relaxed and provides an elastic force to push the brake member downward toward the driving member, so that the second limiting portion is separated from the first limiting portion.

[0016] The fan brake structure described above, wherein: the circuit board has a storage component, when the fan is powered off, the storage component releases electrical energy to the power component of the brake device to drive the driving component to rotate toward a first position, so that the protrusion of the brake component moves along the spiral track to a first top control area, and drives the brake component to move toward the axis and engage with the first limiting portion to produce a locking brake effect, wherein the storage component is a capacitor.

[0017] The fan brake structure is described, wherein: when the fan is powered on and running, the power member of the brake device is driven by the driving member to rotate toward a second position, so that the protrusion moves along the spiral track to a second top control area, and drives the brake member to move away from the first limiting portion of the axis without braking effect.

[0018] The fan brake structure, wherein: a through hole portion is provided in the base frame, the brake component has an outer peripheral side matching the through hole portion, and the through hole portion and the outer peripheral side are mutually matching geometric shapes.

[0019] The fan brake structure, wherein: the elastic member is a conical helical spring.

[0020] With this structure, when the fan fails, the driver rotates, causing the protrusion to slide along the spiral track, causing the brake element to rise and engage the first limiting portion of the axis, generating a braking effect. Alternatively, the brake element, acting upon the elastic member's rebound force, descends and disengages the first limiting portion of the axis, releasing the braking resistance and resuming normal fan operation. This allows for repeated braking and releasing in real time, achieving optimal braking performance while requiring power only during the braking switching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a combined three-dimensional partial cross-section of the fan brake structure of the present invention;

[0022] Figure 2A The fan brake structure of the present invention Figure 1 A partial enlarged schematic diagram;

[0023] Figure 2B The fan brake structure of the present invention Figure 2A Exploded view of the middle brake assembly;

[0024] Figure 2C The fan brake structure of the present invention Figure 2A A three-dimensional diagram of the middle drive component;

[0025] Figure 3 This is a schematic diagram of the fan brake structure of the present invention (I);

[0026] Figure 4Schematic diagram of the fan brake structure of the present invention (II).

[0027] Explanation of the accompanying drawings: fan brake structure 100; fan 1; frame 11; shaft cylinder 12; first opening 121; second opening 122; impeller 13; axis 131; hub 132; blades 133; first limiting portion 134; bearing 14; stator 15; brake device 2; base 21; through hole portion 211; first brake module 22; brake member 221; lower surface 2211; upper surface 2212; protrusion 222; second limiting portion 223; elastic member 224; first brake spring portion 2241; second brake spring portion 2242; outer peripheral side 225; second brake module 23; power member 231; driving member 232; spiral track A; first top control area 2321; second top control area 2322; spiral surface a; first position L; second position R; circuit board 4; electrical connection part 41; storage component 42. DETAILED DESCRIPTION

[0028] The above-mentioned objects and structural and functional characteristics of the present invention will be described with reference to the embodiments of the accompanying drawings.

[0029] See also Figure 1 It is a schematic diagram of a combined three-dimensional partial cross-section of the fan brake structure of the present invention; Figure 2A The fan brake structure of the present invention Figure 1 A partial enlarged schematic diagram; Figure 2B The fan brake structure of the present invention Figure 2A Exploded view of the middle brake assembly; Figure 2C The fan brake structure of the present invention Figure 2A A three-dimensional diagram of the middle drive component;

[0030] Figure 3 1 is a schematic diagram of the operation of the fan brake structure of the present invention (I); Figure 4 This is a schematic diagram of the fan brake structure of the present invention (II). Figure 1 、 Figures 2A to 2C As shown, the present invention discloses a fan brake structure 100 including a fan 1 and a brake device 2 .

[0031] The fan 1 at least comprises a frame 11, a fan wheel 13 and a stator 15; wherein a hollow shaft cylinder 12 is vertically provided at the center of one side of the frame 11, and the shaft cylinder 12 has a first opening 121 and a second opening 122. The first opening 121 is opened at the upper end of the shaft cylinder 12 and is opposite to the fan wheel 13, and the first opening 121 is connected to the second opening 122. The second opening 122 is opened at the bottom end of the shaft cylinder 12 (as shown in FIG. Figure 3 ), and at least one bearing 14 is sleeved on the inner side of the shaft tube 12.

[0032] The impeller 13 is housed in the frame 11, and the impeller 13 has an axis 131, a hub 132, and a plurality of blades 133 formed on the outer peripheral side of the hub 132. One end of the axis 131 is connected and vertically arranged at the center of the inner side of the hub 132. The other end of the axis 131 (i.e., the free end of the axis 131) is passed through the bearing 14 and is pivoted with the bearing 14 and passes through the second opening 122 relative to the shaft tube 12. The free end of the axis 131 has a first limiting portion 134. In this embodiment, the first limiting portion 134 is a groove recessed inward from the end of the free end of the axis 131.

[0033] The stator 15 is sleeved on the outside of the shaft tube 12 and corresponds to the impeller 13 .

[0034] The brake device 2 is arranged at the bottom of the shaft tube 12 and is electrically connected to a circuit board 4. The brake device 2 includes a base frame 21, a first brake module 22 and a second brake module 23; wherein, the base frame 21 is arranged at the bottom end of the shaft tube 12 and docked at the second opening 122, and the first brake module 22 and the second brake module 23 are arranged in sequence from top to bottom in the base frame 21, so that one side (i.e., the upper side) of the first brake module 22 corresponds to the free end of the axis 131 in the shaft tube 12, and the other side (i.e., the lower side) of the first brake module 22 can contact the second brake module 23 relative to it.

[0035] The circuit board 4 is disposed below the second brake module 23 and has an electrical connection portion 41 and a power storage component 42. The electrical connection portion 41 may be, for example, a pin socket, a flat cable, a wire, or an electrical contact. The power storage component 42 is preferably a capacitor that stores and releases energy. Therefore, when power is normally supplied, the power storage component 42 stores a predetermined amount of power and releases the stored power to the brake device 2 when power is interrupted.

[0036] Specifically, see Figures 2A to 2C As shown, the aforementioned first brake module 22 is provided with a brake member 221 and an elastic member 224; the brake member 221 has a lower surface 2211 and an upper surface 2212, and the lower surface 2211 and the upper surface 2212 are respectively provided with a protrusion 222 and a second limiting portion 223. In this embodiment, the protrusion 222 of the brake member 221 is a longitudinal protrusion extending downward from the lower surface 2211 so as to be able to contact the second brake module 23 relative to the second brake module, and the second limiting portion 223 of the brake member 221 is a longitudinal clamping block extending upward from the upper surface 2212, which is used to be embedded (inserted) into or separated from the first limiting portion 134 (groove) on the free end relative to the axis 131.

[0037] The above-mentioned elastic member 224 is located in the base 21 and is mounted on the periphery of the second limiting portion 223 (clamping block) and is located on the upper surface 2212 of the brake member 221. In this embodiment, the elastic member 224 is a conical spiral spring and has a first brake spring portion 2241 and a second brake spring portion 2242. The first brake spring portion 2241 is fixed in contact with an upper end constriction of the base 21, and the second brake spring portion 2242 is in contact with and presses against the upper surface 2212 of the brake member 221 and expands toward the second brake module 23 under normal conditions to push the brake member 221, so that the protrusion 222 of the brake member 221 is in contact with the second brake module 23.

[0038] Furthermore, in order to restrict the brake member 221 of the first brake module 22 to only be able to move linearly in the upward and downward directions within the base frame 21, so that the brake member 221 can rise or fall within the base frame and the second limiting portion 223 (e.g., a clamping block) can engage with or separate from the first limiting portion 134 (e.g., a groove) at the free end of the shaft 131, in this embodiment, a through hole 211 is provided within the base frame 21 to accommodate the brake member 221, and the brake member 221 has an outer peripheral side 225 that cooperates with the through hole 211. Furthermore, the through hole 211 of the base frame 21 and the outer peripheral side 225 of the brake member 221 have mutually matching geometric shapes, such as a rectangle, a rectangle, a polygon, or other shapes, thereby restricting the brake member 221 from linearly reciprocating upward and downward movement within the through hole 212 relative to the base frame 21.

[0039] Furthermore, in order to achieve the aforementioned purpose of separating or engaging the first limiting portion 134 on the free end of the shaft 131 and the second limiting portion 223 on the brake member 221, the engaging structure of the first limiting portion 134 and the second limiting portion 223 may also adopt, for example, a structure in which a recess (tenon) is arranged with a tenon (recess), or a structure in which a recess (bump) is arranged with a bump (recess), or other structural designs, and the geometric shapes of the arrangements are not limited thereto, that is, including but not limited to these.

[0040] Specifically, see Figures 2A to 2C As shown, the aforementioned second brake module 23 is provided with a power component 231 and a driving component 232. The power component 231 is an electric motor with a rotor, or other electric power equipment is electrically connected to the circuit board 4 through the electrical connection portion 41. In this embodiment, the electric motor of the power component 231 is preferably a motor.

[0041] The aforementioned driving member 232 is a cam and is axially connected to the upper side of the rotor of the power member 231 (electric motor). When the power member 231 (electric motor) drives the rotor to rotate, the driving member 232 can be rotated synchronously. The top surface of the driving member 232 has a spiral track A. The spiral track A is provided with a first top control area 2321 and a second top control area 2322. The first top control area 2321 and the second top control area 2322 are connected to form a spiral surface a. Furthermore, in this embodiment, the first top control area 2321 and the second top control area 2322 are designed to be different heights from each other, for example, Figure 2C As shown, the first top control area 2321 is set as the upper area, and the second top control area 2322 is set as the lower area, so that the spiral surface a is designed as an inclined spiral surface; so when the rotor of the power member 231 drives the driving member 232 to reciprocate in a first position L (such as Figure 2C to the left) and a second position R (such as Figure 2C In more detail, when the brake device 2 is rotated toward the first position L by the driving member 232, the protrusion 222 moves to the first top control area (upper area) and is pushed upward, causing the brake member 221 to move upward relative to the base 21, so that the second limiting portion 223 is embedded (inserted) into the first limiting portion 134 and compresses the elastic member 224 (as shown in FIG. Figure 4 As shown). When the driving member 232 rotates toward the second position R, the protrusion 222 moves to the second top control area 2322 (lower area), so that the elastic member 224 is relaxed and provides an expansion elastic force to push the brake member 221 downward toward the driving member 232 of the second brake module 23, so that the second limiting portion 223 is separated from the first limiting portion 134 (as shown). Figure 3 shown) or produced in a separated state.

[0042] In specific implementation, by using the above structure, such as Figure 3As shown, in the normal operation state, the fan 1 is normally powered by the circuit board 4, and the driving member 232 of the second brake module 23 contacts the convex body 222 of the lower surface 2211 of the brake member 221 relative to the first brake module 22 at the second top control area 2322 (lower area). At this time, the elastic member 224 is in a relaxed state and provides an expansion elastic force. At the same time, the upper surface 2212 of the brake member 221 is pushed by the expansion elastic force of the elastic member 224, so that the brake member 221 moves downward relative to the through hole portion 242 of the base 21 toward the driving member 232, and the protrusion 222 of the lower surface 2211 of the brake member 221 abuts against the second top control area 2322 (lower area) of the driving member 232, thereby separating the second limiting portion 223 (clamping block) on the upper surface 2212 of the brake member 221 from the first limiting portion 134 (groove) at the free end of the shaft 131 without braking action. At this time, the fan 1 is operating normally.

[0043] Furthermore, see Figure 4 As shown, when the fan 1 detects no signal (such as a speed signal (FG: Frequency Generation) or a rotation detection signal (RD: Rotation Detection), the fan 1 is in a power-off state. At this time, the storage component 42 of the circuit board 4 releases power to the rotor of the power member 231, thereby driving the driving member 232 of the second brake module 23 toward the first position L (such as Figure 2C When the brake member 221 is rotated to the left (toward the left), the protrusion 222 of the lower surface 2211 of the brake member 221 moves from the second top control area 2322 (lower area) along the spiral surface a to the first top control area 2321 (upper area) and forms an upwardly pushed state, thereby restricting the brake member 221 from being restricted in the through hole portion 42 relative to the base frame 21 due to the sliding structure 24 and moving upward. At the same time, the upper surface 2212 of the brake member 221 presses the elastic member 224, so that the elastic member 224 is in a compressed state, and the second limiting portion 223 (clamping block) on the upper surface 2212 of the brake member 221 is engaged and clamped with the first limiting portion 134 (groove) on the free end relative to the axis 131, thereby achieving the effect of braking. At this time, the second limiting portion 223 (locking block) of the brake member 221 is engaged with the first limiting portion 134 (groove) relative to the axis 131 to form a locking brake, which can also prevent the aforementioned fan wheel 13 from blowing back the wind in reverse, thereby preventing the generation of reverse braking force.

[0044] Also, see Figure 3 As shown, when the fan 1 is powered on from off, the power member 231 is powered from the circuit board 4 and rotates to drive the driving member 232 toward the second position R (as shown in FIG. Figure 2CWhen the brake member 221 is rotated to the right (toward the right side), the protrusion 222 of the lower surface 2211 of the brake member 221 moves from the first top control area 2321 (upper area) along the spiral surface a to the second top control area 2322 (lower area) and forms a non-pushed state, and the elastic member 224 changes from compression to relaxation and expansion, and provides an expansion elastic force to push the upper surface 2212 of the brake member 221. At the same time, the brake member 221 is restricted by the sliding structure 24 relative to the through hole portion 42 of the base 21 and moves downward toward the driving member 232 of the second brake module 23, thereby separating the second limiting portion 223 on the upper surface 2212 of the brake member 221 from the first limiting portion 134 on the free end relative to the axis 131 to release the locked brake and resume the operation of the fan.

[0045] Therefore, by virtue of the design of the fan brake structure of the present invention, when the fan 1 fails to be powered on, when the driving member 232 of the aforementioned second brake module 23 of the present invention rotates toward the first position L, the driving member 232 pushes the protrusion 222 of the lower surface 2211 of the brake member 221 of the first brake module 22 upward with the first top control area 2321 (upper area) thereon, causing the brake member 221 to move upward within the base 21, and the second limiting portion 223 of the upper surface 2212 of the brake member 221 is locked with the first limiting portion 134 at the free end relative to the axis 131, thereby generating a braking resistance effect, thereby accelerating the stopping effect of the impeller 13, and the fan brake structure of the present invention is faster and more rapid than the braking of the conventional brake circuit. Furthermore, when the driving member 232 rotates toward the second position R, the second top control area 2322 (lower area) of the driving member 232 releases relative to the protrusion 222. The brake member 221 is subjected to the release tension of the elastic member 224, causing the second limiting portion 223 thereon to separate from the first limiting portion 134 relative to the free end of the shaft 131, thereby releasing the lock without braking resistance. At this time, the fan can operate normally again.

[0046] Therefore, in the present invention, when the driving member rotates, the protrusion of the brake member slides corresponding to the spiral track, causing the brake member to rise in the base so that the second limiting portion clamps the first limiting portion of the axis to lock the brake, or causing the brake member to descend in the base so that the second limiting portion disengages from the first limiting portion of the axis to release the lock to form a linear reciprocating motion, which can quickly obtain or release the brake function, and only consumes electricity during the brake switching process, thereby reducing power consumption and lowering the cost of use. In addition, since the fan brake structure of the present invention is an external device, it has good sharing and is suitable for fans of various series.

Claims

1. A fan brake structure, characterized in that: include: A fan having a frame, a fan wheel and a stator, wherein a shaft cylinder is vertically provided on the frame, the fan wheel is vertically provided with an axis and is pivotally mounted in the shaft cylinder, the stator is sleeved on the outside of the shaft cylinder and corresponds to the fan wheel, and one end of the axis cylinder has a first limiting portion; and A brake device is provided at the bottom of the shaft cylinder and electrically connected to a circuit board. The brake device comprises a driving member, a brake member, and an elastic member. The elastic member supports one end of the brake member, and the other end of the brake member has a protrusion. The driving member has a spiral track. When the driving member rotates, the protrusion moves corresponding to the spiral track, causing the brake member to rise to clamp the first limit portion of the shaft center to lock the brake or descend and release the brake through the push of the elastic member. The brake device has a base frame, which is arranged at the bottom end of the shaft cylinder. The brake member is arranged in the base frame and has a lower surface and an upper surface. The lower surface and the upper surface respectively have the convex body and a second limiting portion, and the second limiting portion is locked with or separated from the first limiting portion. The axis has a free end, which passes through the shaft tube. The first limiting portion is a groove formed inwardly from the end of the free end. The second limiting portion is a clamping block extended outwardly from the upper surface of the brake component, so that the second limiting portion can be embedded in the first limiting portion, and the brake component moves back and forth in a straight line relative to the base frame, so that the second limiting portion is relatively clamped to the first limiting portion or separated from the first limiting portion.

2. The fan brake structure according to claim 1, wherein: The brake device has a power member, which is arranged at a bottom of the base and is axially connected to the driving member and electrically connected to the circuit board to drive the driving member to rotate. The elastic member is arranged in the base and has a first brake spring and a second brake spring. The first brake spring is fixed to an upper end of the base, and the second brake spring is arranged on the upper surface of the brake member and expands and pushes toward the driving member under normal conditions, so that the protrusion of the brake member contacts the driving member.

3. The fan brake structure according to claim 2, wherein: The power member of the brake device is an electric motor with a rotor. The driving member is axially arranged on the upper side of the power member. The spiral track is located on the other side surface of the driving member and is provided with a first top control area and a second top control area. The first top control area and the second top control area are at different heights and are connected to form a spiral surface.

4. The fan brake structure according to claim 3, wherein: The rotor of the power member drives the driving member to rotate toward a first position, and the protrusion of the braking member moves to a position relative to the first pressing area via the spiral surface of the driving member and is pushed, and the braking member is restricted from moving upward relative to the base, so that the second limiting portion is engaged with the first limiting portion and compresses the elastic member.

5. The fan brake structure according to claim 3, wherein: The rotor of the power member drives the driving member to rotate toward a second position, and the convex body of the brake member moves to a position relative to the second pressing area via the spiral surface of the driving member, and the brake member is not pushed, so that the elastic member is relaxed and provides an elastic force to push the brake member downward toward the driving member, so that the second limiting portion is separated from the first limiting portion.

6. The fan brake structure according to claim 2, wherein: The circuit board has a power storage component. When the fan is powered off, the power storage component releases electrical energy to the power component of the brake device to drive the driving component to rotate toward a first position, so that the protrusion of the brake component moves along the spiral track to a first top control area, and drives the brake component to move toward the axis and engage with the first limiting portion to produce a locking brake effect, wherein the power storage component is a capacitor.

7. The fan brake structure according to claim 2 or 6, wherein: When the fan is powered on, the power member of the brake device is driven by the driving member to rotate toward a second position, so that the protrusion moves along the spiral track to a second top control area, and drives the brake member to move away from the first limiting portion of the axis without braking effect.

8. The fan brake structure according to claim 1, wherein: A through hole portion is provided in the base frame, and the brake component has an outer peripheral side matched with the through hole portion, and the through hole portion and the outer peripheral side are mutually matched geometric shapes.

9. The fan brake structure according to claim 1, wherein: The elastic member is a conical helical spring.

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