Centrifugal fan brake structure

Abstract

The utility model provides a centrifugal fan brake structure which comprises a fan unit and a brake unit, the fan unit is provided with a frame body and fan blades, the brake unit is provided with a brake base and a brake module, the brake base is arranged at the bottom of a shaft barrel of the frame body, a brake claw is arranged on the brake base, and the brake module is pivoted on the axis of the fan blades. The movable hook claw and the elastic assembly are contained in the brake module. The movable hook claw is movably exposed out of or accommodated in the brake module, a hook part corresponding to the brake claw is arranged on the movable hook claw, and the elastic component is propped against the movable hook claw to limit the movable hook claw from being exposed out of or accommodated in the brake module; when the fan fails, the brake structure is driven by centrifugal force generated by reverse rotation of the fan blades due to backflow of air flow to generate a brake function, and when the fan normally operates, the brake function is cancelled, so that the brake function can be repeatedly actuated, the brake structure does not need to be powered and driven, and a fan circuit board does not need to be additionally provided with a brake control function; and the shareability with the existing design is good.

Description

Technical Field

[0001] The utility model relates to a centrifugal fan, in particular to a centrifugal fan brake structure which has high compatibility and can be installed in the existing design. Background Art

[0002] As technology advances, electronic products are becoming thinner and more miniaturized. When used, they generate heat. If the heat is not discharged or guided out immediately, it will cause the electronic product to malfunction, reduce efficiency, or even be damaged. Therefore, it is essential to install a heat dissipation device in the product. Generally, a fan is installed as a heat dissipation device. The existing fan brakes mainly have the following methods:

[0003] 1. When braking, the MOS is normally open when the software controls the power on, and the magnetic field generated by the fan blades and the magnetic field of the tape resist each other and generate resistance.

[0004] 2. When the power is off, the fan blades run by inertia and generate electromotive force to the hardware brake circuit to drive the MOS to be normally open. The magnetic field generated by the fan blades and the magnetic field of the tape resist each other and generate resistance.

[0005] 3. Use a solenoid valve to control the brake mechanism. The fan power supply directly supplies power to the solenoid valve. During normal operation, the solenoid valve is normally open to separate the connection between the shaft and the brake mechanism. When the fan is powered off, the solenoid valve loses its function and the spring drives the brake mechanism to engage with the shaft to generate resistance.

[0006] However, no matter which of the above-mentioned fan brake structures is used, the brake structure of the fan must be designed to add an additional brake circuit or install a microprocessor with a brake mode function on the existing circuit board to achieve a braking effect. The fan brake module as a whole needs to be significantly designed and modified, and has low commonality with the existing fan brake modules.

[0007] In view of the above problems, the author of the present invention has worked hard and devoted himself to research and finally completed the centrifugal fan brake structure of the present invention, overcoming the deficiencies of the conventional technology. Utility Model Content

[0008] The main purpose of the utility model is to provide a centrifugal fan brake structure. When the fan fails, the brake structure is driven to produce a braking function by the centrifugal force generated by the reverse rotation of the fan blades due to the air flow backflow. When the fan is running normally, the brake function will be cancelled, so the brake function can be repeatedly actuated, and there is no need to power the brake structure, and the fan circuit board does not need to be equipped with a brake control function.

[0009] Another object of the utility model is to provide a centrifugal fan brake structure, which adopts a modular design and can be installed at the last moment, so that it has good sharing and the original fan assembly method remains unchanged.

[0010] To achieve the above-mentioned purpose, the utility model provides a centrifugal fan brake structure, including: a fan unit and a brake unit, the fan unit has a frame and a fan blade, the frame is vertically provided with a shaft cylinder, the fan blade is vertically provided with an axis, the axis is axially arranged in the shaft cylinder, one end is pivoted to the fan blade, and the other end extends to form an axis pivot portion, the axis pivot portion can be, for example: flat key type or flat type, but not limited to this; the brake unit has a brake base and a brake module, the brake base is arranged at the bottom of the shaft cylinder, at least one brake claw is arranged on the brake base, the brake module has a through groove correspondingly engaged with the axis pivot portion to pivot the brake module on the axis; the brake module also has at least one movable hook claw and at least one elastic component accommodated therein, the movable hook claw can be movably exposed or accommodated in the brake module, and the movable hook claw is provided with a hook portion corresponding to the brake claw; the elastic component abuts against the movable hook claw to limit the movable hook claw from being exposed or accommodated in the brake module.

[0011] In one embodiment, when the fan blades rotate forward, the brake module is driven to rotate forward, and a positioning bead of the elastic component is embedded in a slot on the movable hook by the thrust of the elastic component (for example, a compression spring), so that the movable hook is accommodated in the brake module.

[0012] In one embodiment, when the fan blade reverses, it drives the brake module to reverse, and the positioning bead of the elastic component disengages from the slot on the movable hook, so that the movable hook is exposed outside the brake module and the hook portion of the movable hook engages with the brake claw.

[0013] In one embodiment, when the fan blade rotates reversely and then forwardly, the movable hook will be pushed back by an inclined surface of the brake claw of the brake base.

[0014] In one embodiment, the through slot of the brake module is a rectangular (e.g., square, long) slot structure. In one embodiment, the axis pivot portion is a flat key type or a flat type. In one embodiment, the frame is a metal or plastic shell. In one embodiment, the shaft tube is provided with upper and lower bearings for positioning. In one embodiment, the movable hook is provided in a pair.

[0015] The utility model uses the above technical solution to trigger the brake using the two different direction logics and kinetic energy of forward rotation and reverse rotation generated by gas reflux when the fan is running normally and when it fails. When the fan fails, the brake structure is driven by the centrifugal force generated by the reverse rotation of the fan blades due to the airflow reflux to produce the braking function. When the fan is running normally, the braking function will be cancelled, and the centrifugal force generated by the forward rotation of the fan blades will not drive the brake structure, so the braking function can be repeatedly actuated. The brake structure does not need to be powered during the process, and the fan circuit board does not need to be equipped with a brake control function. The utility model adopts a modular design for the brake structure, so it can be installed last, with good compatibility and sharing, and the original fan assembly method does not need to be changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A It is a three-dimensional schematic diagram of the combined state of the utility model.

[0017] Figure 1B It is a three-dimensional schematic diagram of the exploded state of the utility model.

[0018] Figure 2A It is a perspective schematic diagram of the brake module of the present utility model.

[0019] Figure 2B It is a schematic diagram of a brake mold of the present utility model.

[0020] Figure 3A This is a schematic diagram of the brake base of the utility model being installed on a fan frame.

[0021] Figure 3B It is a three-dimensional schematic diagram of the brake base of the utility model.

[0022] Figure 4 This is a schematic diagram of the movable hook of the utility model being accommodated in the brake module.

[0023] Figure 5 It is a schematic diagram of the movable hook of the utility model in the brake module.

[0024] Figure 6 This is a schematic diagram of the movable hook of the utility model not contacting the brake claw of the brake base.

[0025] Figure 7 It is a schematic diagram of the engagement between the movable hook claw and the brake claw of the brake base of the utility model.

[0026] Figure 8 It is a schematic diagram of the movable hook of the utility model being separated from the brake claw of the brake base.

[0027] Explanation of the reference numerals in the accompanying drawings: 1 centrifugal fan brake structure; 10 fan unit; 12 frame; 122 shaft cylinder; 14 fan blade; 142 axis; 144 axis pivot joint; 15, 16 upper and lower bearings; 17 buckle; 20 brake unit; 22 brake base; 222 brake claw; 2222 inclined surface; 24 brake module; 241 through groove; 242 positioning pin; 30 movable hook claw; 302 limiting groove; 304 hook; 306 slot; 40 elastic component; 402 positioning bead. DETAILED DESCRIPTION

[0028] The above-mentioned purpose and the structural and functional characteristics of the present invention will be described based on the preferred embodiments of the accompanying drawings.

[0029] Figure 1AThis is a three-dimensional schematic diagram of the combined state of the utility model. Please also refer to Figure 1B , Figure 1B The utility model is a three-dimensional schematic diagram of an exploded state. As shown in the figure, the utility model provides a centrifugal fan brake structure 1, including: a fan unit 10 and a brake unit 20. The fan unit 10 has a frame 12 and a fan blade 14. The frame 12 can be, for example, a metal or plastic shell, but is not limited thereto. The frame 12 is vertically provided with a shaft cylinder 122, and the fan blade 14 is vertically provided with an axis 142. The axis 142 is axially arranged in the shaft cylinder 122. One end of the axis 142 is pivotally arranged on the fan blade 14, and the other end extends The brake unit 20 has a brake base 22 and a brake module 24. The brake base 22 is disposed at the bottom of the shaft tube 122 and is engaged with the bottom of the frame 12. The brake base 22 is provided with at least one brake claw 222 for braking. The shaft tube 122 is provided with upper and lower bearings 15 and 16 for positioning. The brake module 24 is provided with a buckle 17 between the shaft center 142 for positioning.

[0030] Figure 2A This is a perspective schematic diagram of the brake module of the utility model. Figure 2B This is a schematic diagram of the brake mold of the utility model. Please also refer to Figure 2A and Figure 2B The brake module 24 has a through slot 241 corresponding to the axis pivot portion 144 to pivot the brake module 24 on the axis 142. The through slot 241 can be, for example, a rectangular (square, long) slot structure, but not limited thereto. The brake module 24 is provided with a movable positioning pin 242; the brake module 24 also has at least one movable hook 30 and at least one elastic component 40 accommodated therein; the movable hook 30 can be movably exposed or accommodated in the brake module 24. The movable hook 30 can be, for example, a pair of arrangements, but not limited thereto; the movable hook 30 has a limiting slot 302 corresponding to the positioning pin 242, please also refer to Figure 1B The movable hook 30 is provided with a hook portion 304 corresponding to the brake claw 222 of the brake base 22 for mutual engagement and braking; please return to Figure 2A The elastic component 40 can be, for example, a compression spring in this example, but is not limited to this; the elastic component 40 abuts against the movable hook 30, and through the positioning bead 402 arranged in front of the elastic component 40 and in contact with the movable hook 30, the thrust of the elastic component 40 (i.e., the compression spring) limits the movable hook 30 from being exposed or accommodated in the brake module 24. Since the center of the brake module 24 body is a square groove and the axial pivot portion 144 at the end of the axis 142 is designed as a flat key type, the torque of the fan blade 14 can be connected to drive the brake module 24 through this key groove, and the torque of the fan blade 14 can be transmitted to the movable hook 30 through the positioning pin 242.

[0031] Figure 3A This is a schematic diagram of the brake base of the utility model being installed on a fan frame. Figure 3B The brake base of the utility model is a three-dimensional schematic diagram. As shown in the figure, the brake base 22 is installed on the frame 12 of the fan unit 10. The inner periphery of the brake base 22 is provided with a brake claw 222 for braking. The brake claw 222 has an inclined surface 2222. When the fan blade 14 is reversed and then rotated forward, the movable hook 30 will be pushed back by the inclined surface 2222 of the brake claw 222 of the brake base 22. The brake claw 222 structure allows the movable hook 30 in the brake module 24 to be engaged with it when it is thrown out by centrifugal force, and the external structure of the brake base 22 is designed as a claw shape and is engaged with the groove of the frame 12 (not shown in the figure), so that the torque of the fan blade 14 can be finally transmitted to the frame 12 of the fan to achieve the braking function. The various embodiments of the utility model are described in detail below.

[0032] In one embodiment, when the fan blade 14 operates normally, Figure 4 As shown, Figure 4 This is a schematic diagram of the movable hook of the utility model being accommodated in the brake module. Please also refer to Figure 1A and Figure 1B As shown in the figure, when the fan blade 14 rotates forward, it drives the brake module 24 to rotate forward, and the positioning bead 402 of the elastic component 40 (i.e., the compression spring) is embedded in the slot 306 on the movable hook 30 by the thrust of the compression spring, and the movable hook 30 is accommodated in the brake module 24. The positioning bead 402 is embedded in the slot 306 on the movable hook 30 by the thrust of the compression spring to prevent the movable hook 30 from being thrown out and triggering the brake function.

[0033] In one embodiment, when the fan blade 14 fails to operate normally, or the gas backflow blown by other normally operating fans is reversed, such as Figure 5 As shown, the schematic diagram of the movable hook of the utility model in the brake module, please also refer to Figure 1A and Figure 1BAs shown in the figure, when the fan fails and cannot operate normally, the fan blades 14 will reverse due to the reflux of gas blown by other normally operating fans. When the fan blades 14 reverse, the brake module 24 will be driven to reverse together. At this time, the track design direction of the brake module 24 will make the inertia force on the positioning bead 402 opposite to the compression spring thrust of the elastic component 40. When the fan blades 14 reverse to a certain speed so that the inertia force is greater than the compression spring thrust of the elastic component 40, the positioning bead 402 will be separated from the slot 306 on the movable hook 30. At this time, the movable hook 30 can be thrown out by centrifugal force to engage with the brake claw 222 on the brake base 22. Since the external structure of the brake base 22 is designed as a claw shape and is embedded in the groove of the fan frame 12, the torque of the fan blades 14 can be finally transmitted to the frame 12 to achieve the braking function. That is, when the fan blade 14 reverses, it will drive the brake module 24 to reverse, and the positioning bead 402 of the elastic component 40 will disengage from the slot 306 on the movable hook 30, so that the movable hook 30 is exposed outside the brake module 24, and the hook portion 304 of the movable hook 30 engages with the brake claw 222 on the brake base 22, thereby achieving the braking effect.

[0034] Figure 6 This is a schematic diagram of the movable hook of the utility model not in contact with the brake claw of the brake base. This figure is used to illustrate the actuation of the movable hook and the brake base. This figure is illustrated from the bottom perspective of the frame. Please also refer to Figure 1A , Figure 4 and Figure 5 As shown in the figure, when the fan blade 14 rotates forward (clockwise), the movable hook 30 housed in the brake module 24 does not contact the brake claw 222 on the brake base 22. The positioning ball 402 is embedded in the slot 306 on the movable hook 30 by the thrust of the compression spring of the elastic component 40 to prevent the movable hook 30 from being thrown out and triggering the brake function. Since the brake is not triggered, the fan continues to rotate forward.

[0035] Figure 7 This is a schematic diagram of the engagement between the movable hook and the brake base of the utility model. This figure is used to illustrate the actuation of the movable hook and the brake base. This figure is illustrated from the bottom perspective of the frame. Please also refer to Figure 1A , Figure 4 and Figure 5As shown in the figure, when the fan blade 14 fails and cannot operate normally, or stops operating and is reversed (counterclockwise) due to gas reflux, when the fan blade 14 reverses, it will drive the brake module 24 to reverse together. At this time, the inertial force on the positioning bead 402 is opposite to the compression spring thrust of the elastic component 40. When the fan blade 14 reverses to a certain speed so that the inertial force is greater than the compression spring thrust of the elastic component 40, the positioning bead 402 will be disengaged from the slot 306 on the movable hook 30. At this time, the movable hook 30 can be thrown out by centrifugal force to engage with the brake claw 222 on the brake base 22. Since the external structure of the brake base 22 is designed as a claw shape and is embedded in the groove of the fan frame 12, the fan blade torque can eventually be transmitted to the fan frame to achieve the braking function. That is, when the fan blades 14 reverse, the brake module 24 will be driven to reverse, and the positioning beads 402 of the elastic component 40 will disengage from the slots 306 on the movable hook 30, so that the movable hook 30 is exposed outside the brake module 24, and the hook portion 304 of the movable hook 30 engages with the brake claw 222 on the brake base 22. Since the external structure of the brake base 22 is designed to be claw-shaped and is engaged with the groove of the fan frame 12, the torque of the fan blades 14 can be transmitted to the frame 12 to achieve the braking function.

[0036] Figure 8 This is a schematic diagram of the movable hook of the utility model being separated from the brake claw of the brake base. This figure is used to illustrate the actuation of the movable hook and the brake base. Please also refer to Figure 1A , Figure 3B , Figure 4 and Figure 5 As shown in the figure, this figure is illustrated from the perspective of the bottom of the frame. When the fan blade 14 is in normal operation again from the reverse state, the movable hook 30 is pushed back by an inclined surface 2222 of the brake claw 222 on the brake base 22, and the fan blade 14 operates normally. That is, when the fan blade 14 is reversed and then rotated forward, the movable hook 30 will be disengaged by the inclined surface 2222 of the brake claw 222 of the brake base 22, so that the hook portion 304 of the movable hook 30 is disengaged from the brake claw 222.

[0037] In one embodiment, the movable hook 30 in the brake module 24 of the brake unit 20 of the utility model is arranged in a pair, and the pair arrangement is a preferred implementation mode, but is not limited to this. In conjunction with the movable hook 30, the corresponding braking claw 222 and the elastic component 40 can be arranged accordingly according to the use requirements, that is, the preferred embodiment of the utility model is a pair arrangement, but is not limited to this.

[0038] The utility model uses the above technical solution to trigger the brake using the two different direction logics and kinetic energy of forward rotation and reverse rotation generated by gas reflux when the fan is running normally and when it fails. When the fan fails, the brake structure is driven by the centrifugal force generated by the reverse rotation of the fan blades due to the airflow reflux to produce the braking function. When the fan is running normally, the braking function will be cancelled, and the centrifugal force generated by the forward rotation of the fan blades will not drive the brake structure, so the braking function can be repeatedly actuated. The brake structure does not need to be powered during the process, and the fan circuit board does not need to be equipped with a brake control function. The utility model adopts a modular design for the brake structure, so it can be installed last, with good compatibility and sharing, and the original fan assembly method does not need to be changed.

[0039] The above description has been a detailed description of the utility model, and the above description is only a preferred embodiment of the utility model, which should not limit the scope of the implementation of the utility model. That is, all equivalent changes and modifications made based on the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A centrifugal fan brake structure, characterized in that: include: A fan unit comprises a frame and a fan blade, wherein the frame is provided with a shaft cylinder in a vertical direction, and the fan blade is provided with an axis in a vertical direction. The axis cylinder is arranged in the shaft cylinder, one end of the axis cylinder is pivotally arranged on the fan blade, and the other end of the axis cylinder extends to form an axis pivoting portion; A brake unit, comprising a brake base and a brake module, wherein the brake base is disposed at the bottom of the shaft tube, the brake base is provided with at least one brake claw, and the brake module has a through groove, the through groove is correspondingly engaged with the axis pivoting portion, so as to pivotally mount the brake module on the axis; The brake module also has at least one movable hook and at least one elastic component housed therein; the movable hook can be movably exposed or accommodated in the brake module, and a hook portion corresponding to the brake claw is provided on the movable hook; the elastic component abuts against the movable hook to limit the movable hook from being exposed or accommodated in the brake module.

2. The centrifugal fan brake structure according to claim 1, characterized in that: The forward rotation of the fan blade can drive the brake module to rotate forward, and a positioning bead of the elastic component is embedded in a slot on the movable hook by the thrust of the elastic component, so that the movable hook is accommodated in the brake module.

3. The centrifugal fan brake structure according to claim 2, characterized in that: The fan blade reversal can drive the brake module to reverse, and the positioning bead of the elastic component is separated from the slot on the movable hook, so that the movable hook is exposed outside the brake module and the hook portion of the movable hook is engaged with the brake claw.

4. The centrifugal fan brake structure according to claim 3, characterized in that: When the fan blade rotates reversely and then forwardly, the movable hook can be pushed back by an inclined surface of the brake claw of the brake base.

5. The centrifugal fan brake structure according to claim 1, characterized in that: The through slot of the brake module is a rectangular slot structure.

6. The centrifugal fan brake structure according to claim 1, wherein: The axial pivoting portion is a flat key type or a flat type.

7. The centrifugal fan brake structure according to claim 1, characterized in that: The frame is a metal or plastic shell.

8. The centrifugal fan brake structure according to claim 1, wherein: The shaft cylinder is provided with upper and lower bearings for positioning.

9. The centrifugal fan brake structure according to claim 1, wherein: The movable hook is arranged as a pair.

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