Fan brake mechanism

Abstract

The utility model provides a fan brake mechanism which comprises a fan unit and a brake unit. The fan unit comprises a frame body and a fan blade, a shaft barrel is vertically arranged on the frame body, and the fan blade is provided with an axis with a pivoting part so as to be axially arranged in the shaft barrel. The brake unit comprises a brake base and a brake module, and the brake base is provided with a brake claw. The brake module comprises a body, at least one movable piece contained in the body and a limiting pin arranged corresponding to the movable piece. The body is provided with a through groove which is correspondingly jointed with the pivoting part so as to pivot the brake module on the axis. One end of the movable part is provided with a claw part, the other end of the movable part is provided with a wind resistance device, and a limiting groove opposite to the limiting pin is formed in the position, between the claw part and the wind resistance device, of the movable part. The movable part is movably located in the body. When the fan fails and cannot operate normally, the fan blades rotate reversely due to backflow of air flow, the fan brake mechanism is driven to generate a brake function, power supply driving is not needed, and a fan circuit board does not need to be additionally provided with a brake control function.

Description

Technical Field

[0001] The utility model relates to a fan brake mechanism, in particular to a fan brake mechanism with a wind resistance device and a hook portion. Background Art

[0002] With the rapid advancement of technology, the computing performance of electronic devices has increased significantly, and at the same time, a large amount of heat is generated. To ensure that electronic devices are not damaged by high temperatures, a heat dissipation device must be installed. For example, a fan is a common heat dissipation device. When one of the multiple fans in the heat dissipation device is damaged and stops working, the fluid pressure at that location will be lower than the fluid pressure inside the device. According to the principles of fluid mechanics, the fluid at the high pressure location will flow to the low pressure location, causing the airflow inside the device to flow out to the rupture of the damaged fan, thereby causing the stopped fan to rotate in the opposite direction and take away the internal airflow, resulting in a sharp drop in heat dissipation efficiency. To prevent the above situation from occurring, a brake system can be installed on the fan.

[0003] The existing fan brakes mainly have the following methods:

[0004] 1. When braking, the MOS is normally open when the power is turned on by software control. The magnetic field generated by the fan blades and the magnetic field of the tape resist each other and generate resistance.

[0005] 2. When the power is off, the fan blades run by inertia and generate an electromotive force to the hardware brake circuit to drive the MOS normally open. The magnetic field generated by the fan blades and the magnetic field of the tape resist each other and generate resistance.

[0006] 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.

[0007] However, regardless of the aforementioned fan brake structure, the fan brake structure 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 the braking effect. The design of the fan brake module requires a significant redesign and modification of the existing fan structure. In addition, the fan circuit board is already densely packed with various circuits. As a result, when a brake circuit or drive logic circuit is subsequently added, it cannot be directly arranged on the originally designed circuit board. The industry also needs to redesign the circuit board, causing trouble for the industry in manufacturing and use.

[0008] In view of this, how to solve the above problems and shortcomings is an urgent research direction. Utility Model Content

[0009] The purpose of the present utility model is to provide a fan brake mechanism. When the fan is operating normally, the blades rotate in the forward direction. The thrust generated by the wind resistance overcomes the centrifugal force, causing the movable part to retract inward and the fan brake function not to be activated. When the fan fails, the blades rotate in the reverse direction. Due to the action of centrifugal force, the claw of the movable part is thrown out, causing it to engage with the hook of the brake claw, thereby driving the fan brake mechanism to produce a braking function, so that the failed fan will not continue to rotate in the reverse direction and take away the airflow inside the device. When the fan resumes normal operation, the thrown claw will disengage from the hook and push back along the inclined surface of the brake claw, thereby canceling the braking function. Therefore, a repeatedly actuated braking function can be achieved without the need to power the fan brake mechanism and the fan circuit board does not need to be equipped with a brake control function. In addition, the fan brake mechanism adopts a modular design with good commonality, and the original fan assembly method does not need to be changed.

[0010] The utility model provides a fan brake mechanism, comprising a fan unit and a brake unit. The fan unit comprises a frame and a fan blade, a shaft cylinder is vertically arranged on the frame, an axis is vertically arranged on the fan blade, the fan blade is pivotally arranged at one end of the axis, and the other end of the axis is axially arranged in the shaft cylinder and has a pivot portion. The brake unit is arranged at the bottom of the frame. The brake unit comprises a brake base and a brake module. The brake base is provided with a brake claw. The brake module comprises a main body, at least one movable part accommodated in the main body, and a limit pin corresponding to the movable part. The main body is provided with a through groove, and the through groove is correspondingly engaged with the pivot portion to pivot the brake module to the axis. One end of the movable part has a claw portion, and the other end of the movable part is provided with a wind resistor, and the movable part is provided with a limit groove corresponding to the limit pin between the claw portion and the wind resistor, so that the movable part can be movably limited in the main body.

[0011] According to an embodiment of the present invention, the brake base includes a base and a flange, the brake claw is disposed on the inner surface of the flange, and the brake module is disposed in the brake base.

[0012] According to an embodiment of the present invention, the wind resistance device includes a wind resistance piece. The wind resistance piece is provided with a plug-in portion. The wind resistance piece is connected to the movable member via the plug-in portion.

[0013] According to an embodiment of the present invention, the braking claws are arranged in pairs.

[0014] According to an embodiment of the present invention, the brake base further includes an engaging portion, which is arranged on the outer side of the base and is used to engage with the bottom of the shaft tube.

[0015] According to one embodiment of the present invention, the wind baffle includes a first plane facing one side of the claw portion. When the fan blade rotates forward, the axis drives the brake module to rotate forward, and the first plane is thrust by an airflow to cause the claw portion to retract inward until the side of the limit groove close to the claw portion abuts against the limit pin without contacting the brake claw.

[0016] According to one embodiment of the present invention, the wind baffle includes a second plane facing away from the claw portion. When the fan blade rotates in the opposite direction, the axis drives the brake module to rotate in the opposite direction. The second plane is subjected to an airflow thrust, and due to the action of centrifugal force, the claw portion is pushed outward until the side of the limit groove away from the claw portion abuts against the limit pin and engages with the brake claw.

[0017] According to one embodiment of the present invention, each braking claw includes a slope and a hook portion, and the slope is inclined toward the axis in the forward direction. When the fan blade rotates in the reverse direction and then in the forward direction, the claw will disengage from the hook portion and be pushed back by the slope.

[0018] According to an embodiment of the present invention, a bent section is further provided between the claw portion and the wind resistor, and the bent section forms an L-shaped structure with the end having the claw portion and the end having the wind resistor.

[0019] According to an embodiment of the present invention, the fan unit further includes an upper bearing and a lower bearing. The upper bearing and the lower bearing are disposed in the shaft tube for supporting the axis.

[0020] According to the fan brake mechanism disclosed in the above embodiment, when the fan is operating normally, the blades rotate forward, and the axis drives the brake module to rotate forward. This causes the first flat surface of the wind baffle facing the claw to be pushed by airflow, causing the claw to retract inward until the side of the retaining groove closest to the claw abuts against the retaining pin and no longer contacts the brake claw. When the fan fails and cannot operate normally, air backflow from the other fans causes the fan blades to rotate in the opposite direction. The axis drives the brake module to rotate in the opposite direction, causing the second flat surface of the wind baffle facing away from the claw to be pushed by airflow. Due to centrifugal force, the claw is pushed outward until the side of the retaining groove away from the claw abuts against the retaining pin and engages with the hook, thereby activating the brake function. Therefore, the failed fan will not continue to rotate in the opposite direction and remove airflow from the device, thereby preventing a sudden drop in heat dissipation efficiency. Furthermore, when the fan resumes normal operation, the blades return from reverse rotation to forward rotation, and the claw disengages from the hook and is pushed back by the inclined surface of the brake claw on the brake base.

[0021] The present invention utilizes the aforementioned technical solution to achieve a repetitive braking function without requiring power to the fan brake mechanism or the addition of a brake control function to the fan circuit board. Furthermore, the present invention's fan brake mechanism utilizes a modular design, allowing it to be added to the fan as a last resort, ensuring compatibility and interoperability without requiring changes to the existing fan assembly method.

[0022] The above description of the content of the present invention and the following description of the embodiments are intended to demonstrate and explain the principles of the present invention and to provide further explanation of the scope of the patent application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1A FIG2 is a cross-sectional schematic diagram of a fan brake mechanism according to an embodiment of the present invention.

[0024] Figure 1B for Figure 1A Exploded diagram of the fan brake mechanism.

[0025] Figure 2 for Figure 1A A three-dimensional schematic diagram of the brake base and brake module.

[0026] Figure 3 The figure is a bottom view of a brake base installed on a fan frame according to an embodiment of the present invention.

[0027] Figure 4 FIG. 1 is a schematic diagram illustrating the operation of a claw of a movable member in a brake module according to an embodiment of the present invention.

[0028] Figure 5A To observe from the bottom of the fan frame Figure 4 Schematic diagram of the retracted claws of the brake module.

[0029] Figure 5B To observe from the bottom of the fan frame Figure 4 Schematic diagram of the brake module's claws being thrown out.

[0030] Figure 6A This is a schematic diagram of the first moment when the pawl portion is disengaged from the brake pawl of the brake base according to an embodiment of the present invention.

[0031] Figure 6B FIG. 1 is a schematic diagram of a second time when a pawl portion disengages from a brake pawl of a brake base according to an embodiment of the present invention.

[0032] Explanation of the reference numerals: 1. Fan brake mechanism; 10. Fan unit; 100. Frame; 110. Shaft cylinder; 101. Fan blade; 102. Axis; 1021. Pivot joint; 103. Upper bearing; 104. Lower bearing; 105. Retaining ring; 106. Stator assembly; 20. Brake unit; 210. Brake base; 211. Base; 212. Flange; 213. Braking claw; 214. Engaging portion; 2131. Inclined surface; 2132. Hook; 220. Brake module; 221. Body; 222. Movable part; 223. Limiting pin; 2210. Through slot; 2220. Claw; 2221. Wind resistance device; 2221a. Connecting portion; 2221b. Wind resistance sheet; 22211. First plane; 22212. Second plane; 2223. Limiting slot; 2224. Bending section. DETAILED DESCRIPTION

[0033] See also Figure 1A and Figure 1B shown. Figure 1AFIG2 is a cross-sectional diagram of a fan brake mechanism according to an embodiment of the present invention. Figure 1B for Figure 1A Exploded diagram of the fan brake mechanism. Figure 1A As shown, the present invention provides a fan brake mechanism 1, comprising a fan unit 10 and a brake unit 20. The fan unit 10 comprises a frame 100 and a fan blade 101, wherein the frame 100 can be made of metal or plastic. A shaft cylinder 110 is vertically mounted on the bottom base of the frame 100. The shaft cylinder 110 has an upper bearing 103 and a lower bearing 104 therein for supporting the shaft 102.

[0034] The fan blade 101 is vertically mounted on the axis 102. One end of the axis 102 is pivotally mounted on the fan blade 101. The other end of the axis 102 is axially mounted in the shaft tube 110 and has a pivot portion 1021. The pivot portion 1021 can be a flat key-type pivot portion or a flat pivot portion extending from the lower bearing 104, but the present invention is not limited thereto.

[0035] Please refer to Figure 1B As shown, in addition to the aforementioned frame 100, fan blades 101, shaft 102, upper bearing 103, lower bearing 104, and shaft barrel 110, the fan unit 10 also includes a rotor (not shown) and a stator assembly 106. Furthermore, a retaining ring 105 may be provided between the brake module 220 and the shaft 102 for positioning purposes.

[0036] See also Figure 2 shown. Figure 2 for Figure 1A The brake unit 20 includes a brake base 210 and a brake module 220. Figure 2 Below, the brake base 210 of this embodiment includes a base 211. The base 211 can be, for example, an annular base. The outer side of the base 211 is provided with a fitting portion 214, which can, for example, include a plurality of outwardly protruding components. The inner edge of the base 211 extends axially to form a hollow cylindrical flange 212. A pair of braking claws 213 are provided on the inner surface of the flange 212 (the braking claw on the other side is not shown in the figure). Each braking claw 213 can include a slope 2131 and a hook portion 2132. Please refer to Figure 2 Above, the brake module 220 of this embodiment includes a body 221, a pair of movable parts 222, and a pair of limit pins 223 arranged opposite to the pair of movable parts 222. The body 221 can be made of metal. A through slot 2210 is provided at the center of the body 221. The through slot 2210 can be a polygonal slot structure. The through slot 2210 is used to Figure 1AThe pivotal portion 1021 in the main body 221 is correspondingly engaged to pivotally mount the brake module 220 on the axis 102. Since the pivotal portion 1021 is correspondingly engaged with the through slot 2210 of the main body 221, the torque generated by the rotation of the fan blades 101 can drive the brake module 220 to rotate. The stop pin 223 is provided on the outer periphery of the main body 221.

[0037] The movable member 222 can be accommodated in a through-hole on the side of the main body 221, for example. One end of the movable member 222 has a claw portion 2220, and the other end is provided with a wind resistor 2221. The wind resistor 2221 includes a plug-in portion 2221a and a wind resistance sheet 2221b, and the wind resistance sheet 2221b is connected to the movable member 222 via the plug-in portion 2221a. A curved section 2224 is further provided between the claw portion 2220 and the wind resistance 2221. The curved section 2224 forms an L-shaped structure between the end of the movable member 222 provided with the wind resistance 2221 and the end provided with the claw portion 2220. A limiting groove 2223 is further provided between the claw portion 2220 and the curved section 2224. The limiting groove 2223 and the limiting pin 223 are arranged opposite to each other. By means of the limiting groove 2223 of the movable member 222 and the limiting pin 223 passing through the main body 221 , the movable member 222 can be movably limited in the main body 221 .

[0038] See also Figure 3 shown. Figure 3 This is a bottom view of a brake base mounted on a fan frame according to an embodiment of the present invention. Figure 3 As shown, the engaging portion 214 of the brake base 210 of this embodiment comprises a plurality of members protruding outward from the base 211. The brake base 210 is secured to the bottom of the frame 100 by the engaging portion 214 engaging with the bottom of the frame 100. The structure and number of the engaging portions 214 can vary depending on the shape of the opening at the bottom of the frame, and the present invention is not limited thereto.

[0039] See also Figure 4 、 Figure 5A and Figure 5B shown. Figure 4 FIG. 1 is a schematic diagram illustrating the operation of a claw of a movable member in a brake module according to an embodiment of the present invention. Figure 5A To observe from the bottom of the fan frame Figure 4 Schematic diagram of the retracted claws of the brake module. Figure 5B To observe from the bottom of the fan frame Figure 4 Schematic diagram of the brake module's claws being thrown out.

[0040] Please see first Figure 4 and Figure 5AAs shown, when the fan is operating normally, the fan blades 101 rotate forward. Since the brake module 220 is pivotally mounted on the axis 102, the axis 102 also drives the brake module 220 to rotate forward, causing the first flat surface 22211 of the wind baffle 2221b facing the claw portion 2220 to be subjected to an airflow thrust. This airflow thrust is greater than the centrifugal force that throws the movable member 222 out during the rotation of the brake module 220, thereby causing the claw portion 2220 of the movable member 222 to retract inward toward the stop pin 223. As can be clearly seen in FIG. 5A , due to the retraction of the claw portion 2220, it will not engage with the hook portion 2132 of the brake claw 213 on the brake base 210. This mechanism ensures that the brake function will not be triggered when the fan is operating normally.

[0041] Please continue reading Figure 4 and Figure 5B As shown, in another embodiment, the fan fails. Since the fluid pressure at the failed fan location is lower than the fluid pressure inside the device (other fans are operating normally, not shown in the figure), according to the principles of fluid mechanics, the fluid at the high pressure location will flow to the low pressure location, causing the airflow at the failed fan to flow out in the opposite direction (not shown in the figure), causing the fan blades 101 to rotate in the opposite direction, so the axis 102 will drive the brake module 220 to rotate in the opposite direction. At this time, because the second plane 22212 of the wind resistance sheet 2221b facing away from the claw 2220 is subjected to an airflow thrust, and under the action of centrifugal force, the claw 2220 of the brake module 220 is thrown out toward the outside of the body 221 ( Figure 4 The dotted line portion of the claw portion) until the side of the limiting groove 2223 away from the claw portion 2220 abuts against the limiting pin 223 (see Figure 2 Braking module 220 above). Figure 5B It can be clearly seen that because the claw portion 2220 of the movable member 222 of the brake module 220 is thrown outward, it engages with the hook portion 2132 of the brake claw 213 on the brake base 210, thereby exerting the braking effect. It should be noted that in the embodiment of the present invention, forward rotation (or forward rotation direction) refers to clockwise rotation for an observer observing the brake unit 20 from the bottom of the frame 100. Conversely, reverse rotation refers to counterclockwise rotation for the observer. Of course, the so-called forward rotation and reverse rotation directions can be changed depending on the actual design and requirements of the fan unit 10, and the present invention is not limited to this.

[0042] See also Figure 6A and Figure 6B shown. Figure 6A This is a schematic diagram of the first moment when the pawl portion is disengaged from the brake pawl of the brake base according to an embodiment of the present invention. Figure 6B This is a schematic diagram of the second time when the claw part is separated from the brake claw of the brake base according to an embodiment of the present invention. Figure 5B 、 Figure 6A and Figure 6B In this embodiment, after the fan fails and is repaired and resumes normal operation, the fan blades 101 will return to the forward rotation state from the reverse rotation state, and drive the brake module 220 to rotate forward again. Since the brake claw 213 on the brake base 210 of the utility model is designed with the inclined surface 2131 tilted in the forward rotation direction (clockwise) toward the axis, the claw portion 2220 of the movable member 222 will be moved from the reverse rotation state to the forward rotation state. Figure 5B The state of engagement with the hook portion 2132 is transformed into Figure 6A The claw portion 2220 is shown as being out of the hook portion 2132 at the first time and is pushed back by the inclined surface 2131. Then, the wind resistance 2221 is used to transform the claw portion 2220 into the hook portion 2132. Figure 6B The claw portion 2220 of the second time is shown to be in the retracted state and will not contact the hook portion 2132 of the braking claw 213. Thereby, when the fan resumes normal operation, the braking function will be cancelled.

[0043] Through the above-mentioned technical solution, when the fan is operating normally, the wind resistor converts the thrust of the fan's forward rotation into reverse resistance against the centrifugal force of the claw, preventing the claw from being thrown out of the body and triggering the brake function. When the fan fails, the fan blades rotate in the reverse direction, causing the axis to drive the brake module in the reverse direction. At this time, the wind resistor loses its reverse resistance against the centrifugal force of the claw and converts the thrust of the fan's reverse rotation into a force that pushes the claw out. Due to the centrifugal force, the claw is thrown out until it engages with the brake claw on the brake base, thereby exerting the braking effect. When the fan is repaired and normal operation resumes, the fan blades return to forward rotation, and the brake module's claw disengages from the hook and is pushed back by the inclined surface of the brake claw on the brake base, canceling the braking function. Therefore, the brake function can be repeatedly actuated without requiring power to the fan brake mechanism or the addition of a brake control function to the fan circuit board. Furthermore, the fan brake mechanism is modularized and can be added at the end of the fan assembly process, improving compatibility and interoperability, without changing the original fan assembly method.

[0044] The above description has provided a detailed description of the present invention. However, the above description is merely a preferred embodiment of the present invention and should not limit the scope of the present invention. In other words, all equivalent variations and modifications based on the present invention should still fall within the scope of the patent of the present invention.

Claims

1. A fan brake mechanism, characterized in that: include: A fan unit includes a frame and a fan blade, wherein a shaft is vertically mounted on the frame, and an axis is vertically mounted on the fan blade. The fan blade is pivotally mounted on one end of the axis, and the other end of the axis is mounted in the shaft and has a pivot portion; and a brake unit disposed at the bottom of the frame, the brake unit comprising a brake base and a brake module, the brake base being provided with a brake pawl, the brake module comprising a body, at least one movable member received in the body, and a stop pin corresponding to the movable member, the body being provided with a through slot correspondingly engaged with the pivoting portion to pivotally mount the brake module on the axis; One end of the movable part has a claw, the other end of the movable part is provided with a wind resistor, and a limiting groove opposite to the limiting pin is provided between the claw and the wind resistor, and the movable part is movably located in the main body.

2. The fan brake mechanism according to claim 1, wherein: The brake base includes a base and a flange. The brake claw is arranged on the inner surface of the flange, and the brake module is arranged in the brake base.

3. The fan brake mechanism according to claim 1, wherein: The wind resistance device comprises a plug-in portion and a wind resistance piece, and the wind resistance piece is connected with the movable part via the plug-in portion.

4. The fan brake mechanism according to claim 3, wherein: The brake claws are arranged in pairs.

5. The fan brake mechanism according to claim 2, wherein: The brake base further comprises an engaging portion, which is arranged on the outer side of the base and is used for engaging with the bottom of the shaft cylinder.

6. The fan brake mechanism according to claim 3, wherein: The wind baffle includes a first plane facing one side of the claw. When the fan blade rotates forward, the axis drives the brake module to rotate forward. The first plane is pushed by an airflow to cause the claw to retract inward until the limiting groove is close to the side of the claw and abuts against the limiting pin without contacting the brake claw.

7. The fan brake mechanism according to claim 4, wherein: The wind baffle includes a second plane facing away from the claw. When the fan blade rotates in the opposite direction, the axis drives the brake module to rotate in the opposite direction. The second plane is subjected to airflow thrust, and due to the action of centrifugal force, the claw is pushed outward until the side of the limit groove away from the claw abuts against the limit pin and engages with the brake claw.

8. The fan brake mechanism according to claim 4, wherein: Each braking claw includes an inclined surface and a hook portion, the inclined surface is inclined toward the axis direction in the forward direction, when the fan blade rotates in the reverse direction and then rotates in the forward direction, the claw portion is separated from the hook portion and is pushed back by the inclined surface.

9. The fan brake mechanism according to claim 1, wherein: A curved section is further provided between the claw portion and the wind resistor, and the end provided with the wind resistor and the end provided with the claw portion form an L-shaped structure through the curved section.

10. The fan brake mechanism according to claim 1, wherein: The fan unit further comprises an upper bearing and a lower bearing, wherein the upper bearing and the lower bearing are arranged in the shaft cylinder and are used for supporting the axis.

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