TW201823592A - Braking structure for fan - Google Patents

Abstract

A braking structure for fan includes a fan and a braking device connected to the fan. The braking device includes a first braking mechanism, a second braking mechanism and a support seat. The first braking mechanism is connected to a free end of a shaft of the fan, the second braking mechanism is fitted in the support seat, and the support seat is engaged with a bottom of a frame of the fan. When the fan is turned off, the braking device is no longer energized, bring the first and the second braking mechanism to engage with each other and accordingly produce a braking effect, so that the fan can more quickly stop rotating.

Description

Fan brake structure

The present invention relates to a fan brake structure, and more particularly to a fan brake structure with better braking effect and high commonality.

In many consumer products, fans are the main cooling tool. When the system temperature is too high, the fan will start to reduce the overall system temperature and achieve heat dissipation. When the system temperature drops to a specific value, the fan will stop. Traditionally, in order to prevent the overall system from being burned due to excessive temperature, a cooling fan is usually installed in the system to protect it. However, in order to cope with the faster and faster heat dissipation of the components, the fan speed requirements will become higher and higher. Therefore, after the fan is powered off, the fan will continue to run for a period of time before it completely stops. Therefore, it is known that the current braking technology of DC fans is mainly realized by circuit boards. There are two forms: the first is that the power-on brake is implemented by a software program. When the power is turned on, the microprocessor's microprocessor (MCU) controls a motor drive circuit. The two lower arm MOS transistors of the H-Bridge are always on, so that the fan's multiple blades generate a magnetic field during operation, and the magnetic field generates resistance to achieve the braking effect. The second type is to turn off. The electric brake is implemented by hardware. For example, the H-Bridge provided by the capacitor energy storage device to the motor drive circuit in the fan when the power is off, so that the two MOS transistors in the lower arm are always open, so that H The two ends of a motor coil connected to the fan in a bridge type form a short circuit, so that the magnetic pole of the motor cannot be changed to achieve the braking effect. Therefore, the conventional fan braking technology must be designed to add additional braking circuits on the original circuit board of the fan or install a microprocessor with a braking mode function to have the braking effect. However, braking through the aforementioned circuit braking method can only be performed slowly. The number of fan blades stalled, but the fan blades could not be stopped faster. In addition, in addition to the existing functions on the original circuit boards of any series of fans, if an additional brake circuit is required to achieve the braking effect, the original circuit boards of any series of fans already have printed electronic components on each other. It is difficult to add the brake circuit directly to the original circuit board, so that the industry must use a new circuit board to change the design of the original circuit board before adding the brake circuit. The above method of fan braking is less common.

Therefore, in order to effectively solve the above-mentioned problems, an object of the present invention is to provide a fan brake structure in which a first braking mechanism and a second braking mechanism in a braking device are engaged with each other to generate a braking effect when a fan is powered off. Another object of the present invention is to provide a fan brake structure with high commonality. To achieve the above object, the present invention provides a fan brake structure including a fan and a brake device. The fan has a frame body and a fan wheel, the frame body has a shaft seat, the shaft seat has a first opening and a The second opening communicates with the first opening, the fan wheel is accommodated in the frame, and the fan wheel has an axis center pivoted with the shaft seat, and the free end of the axis center passes through the first opening. And located between the first and second openings, the brake device has a first brake mechanism, a second brake mechanism, and a bracket; the first brake mechanism is connected to the free end of the shaft center in the shaft seat; Two brake mechanisms are arranged in the bracket, and the bracket is opposite to the second opening opposite to the shaft seat. When the fan is powered off, the brake device is not excited and the first and second brake mechanisms are engaged. Braking effect, through the design of the fan braking structure of the present invention, it is possible to effectively achieve better braking effect and high commonality. In one implementation, the first braking mechanism is provided with a first braking portion, the first braking portion has a plurality of first wedge-shaped teeth, and the first teeth are formed on a side surface of the first braking portion. The other side surface of a braking portion is connected to the free end of the shaft center in the shaft seat. In one implementation, the second brake mechanism is provided with a second brake portion and a magnetic valve portion. The second brake portion has a plurality of wedge-shaped second teeth, and the second teeth are formed on one side of the second brake portion. On the surface, and the second teeth are engaged or separated from the first teeth opposite to each other, the magnetic valve portion is disposed in the bracket, and one end of the magnetic valve portion in the bracket is connected to the second teeth. The other side surface of the braking portion. In one implementation, the first tooth flanks have a first meshing surface that is unidirectional in the direction of rotation or counter-rotation, and the second tooth flanks have a second meshing surface that is unidirectional in the direction of rotation or counter-rotation. The first engaging surface is engaged or separated from the second engaging surfaces. In one implementation, the magnetic valve part is provided with an elastic member, a magnetic valve shaft center, and a magnetic valve body. The magnetic valve body has a hole formed at the center of the magnetic valve body, and the magnetic valve An electromagnetic coil surrounds the outside of the body. One end of the magnetic valve shaft center is connected to the other side surface opposite to the second braking portion, and the other end thereof protrudes into the hole. The elastic member is accommodated in the hole and located at Between the magnetic valve shaft center and the magnetic valve body, the magnetic valve body is magnetized to attract the magnetic valve shaft center toward the inner bottom of the hole and compress the elastic member. In one implementation, when the elastic member is compressed and the magnetic valve body is not excited, the elastic member provides an elastic force to push the axis of the magnetic valve toward the first braking portion. In one implementation, the bracket is provided with a convex ring portion and a clamping portion. The convex ring portion is ring-shaped on the outer peripheral side of the bracket. The clamping portion is formed by one end of the bracket protruding upward, and is opposite to the shaft seat. The second opening is engaged with each other, and one side surface of the convex ring portion is closely abutted on the outer side of the bottom of the shaft seat. In one implementation, the elastic member is a coil spring. In one implementation, the magnetic valve body is provided with at least one restricting groove, the restricting groove is formed by recessing the inside of the hole, and communicates with the hole. At least one restricting convex body is provided on the outer peripheral side of the magnetic valve shaft center. The restriction protrusion extends into the restriction groove to restrict the restriction protrusion from moving upward and downward in the restriction groove.

The above object of the present invention and its structural and functional characteristics will be described based on the embodiments of the drawings. The present invention provides a fan brake structure. Please refer to Figs. 1A, 1B, and 2 for an exploded and assembled perspective view of an embodiment of the present invention, and supplemented with reference to Fig. 3. The fan braking structure includes a fan 1 and a braking device 2. The fan 1 has a frame 11 and a fan wheel 12. The frame 11 has a shaft seat 111. The shaft seat 111 is disposed at the center of the frame 11. The shaft base 111 is provided with a first opening 113 and a second opening 114. The first opening 113 is located at one end of the shaft base 111 and is opposite to the fan wheel 12. The second opening 114 communicates with the first opening 114. An opening 113 is formed on the bottom of the frame 11, and a stator group 14 wound with a plurality of coils is sleeved on the outside of the shaft seat 111. The fan wheel 12 is accommodated in the frame 11, and the fan wheel 12 has an axis 121, a hub 122 and a plurality of blades 123 formed on the outer peripheral side of the hub 122. One end of the axis 121 (that is, The free end of the shaft center 121) is pivoted relative to the shaft seat 111, and the other end thereof is connected to the center of the hub 122, and the free end of the shaft center 121 penetrates the first opening 113 and is located at the first and second sides. Between the openings 113 and 114, a magnetic member 13 (such as a magnet) is provided in the hub 122, and the magnetic member 13 is inductively excited with the stator group 14 opposite to the stator member 14. In addition, the aforementioned braking device 2 has a first braking mechanism 21, a second braking mechanism 22 opposite to the first braking mechanism 21, and a bracket 23, and the first braking mechanism 21 is freely connected to the shaft center 121 in the shaft seat 111. At the end, the second brake mechanism 22 is disposed in the bracket 23, and the bracket 23 is in contact with the second opening 114 opposite to the shaft base 111. The first braking mechanism 21 is provided with a first braking portion 211. The first braking portion 211 has a plurality of first teeth 2111 having a wedge shape. The first teeth 2111 are formed on one side surface of the first braking portion 211. The other side surface of the first braking portion 211 is connected to the free end of the shaft center 121 in the shaft base 111. The second braking mechanism 22 is provided with a second braking portion 221 and a magnetic valve portion 222. The second braking portion 221 has a plurality of wedge-shaped second teeth 2211, and the second teeth 2211 are formed on the second braking portion 221. On one side of the surface, and the second teeth 2211 are engaged (such as one-way meshed) or separated from the first teeth 2111. Therefore, when the fan 1 is powered on, the braking device 2 is excited, so that the first and second braking mechanisms 21 and 22 are separated from the first and second teeth 2111 and 2211 without braking (as shown in FIG. 2A). When the fan 1 is powered off, the braking device 2 is not excited, and the first and second braking mechanisms 21 and 22 are engaged with a plurality of first and second teeth 2111 and 2211 to generate a braking effect (as shown in FIG. 2C). In specific real-time application, the aforementioned plurality of first and second teeth 2111 and 2211 are not limited to being wedge-shaped, and the first and second braking portions 211 and 221 are formed with mating or meshing on the opposite surfaces of each other to achieve the braking effect. The structure can be the structure of the first and second teeth 2111 and 2211 according to the present invention. For example, the plurality of first teeth 2111 is designed as a convex body (or a cavity) formed on one side surface of the first braking portion 211. The plurality of second teeth 2211 are designed as a recess (or a convex body) fitted with the first teeth 2111 opposite to the first teeth 2111 to achieve a braking effect, or phase separation without generating a braking effect. And when the fan 1 is powered off, the first teeth 2111 are used as convex bodies (or recesses) to fit with the second teeth 2211 as concave (or convex bodies), which can prevent the fan wheel 12 times. The wind is reversed to prevent the effect of back-EMF. The magnetic valve portion 222 is disposed in the bracket 23, and one end of the magnetic valve portion 222 in the bracket 23 is connected to the other surface of the second opposite to the second braking portion 221, and the magnetic valve portion 222 An elastic member 2221, a magnetic valve shaft center 2222, and a magnetic valve body 2224 are provided. The magnetic valve body 2224 is housed in the bracket 23, and the magnetic valve body 2224 has a hole 2225 formed in the hole 2225. At the center of the magnetic valve body 2224, one end of the magnetic valve shaft center 2222 is connected to the other surface opposite to the second braking portion 221, and the other end thereof protrudes into the hole 2225. The aforementioned elastic member 2221 is accommodated in The hole 2225 is located between the magnetic valve axis 2222 and the magnetic valve body 2224. The elastic member 2221 is shown as a helical spring in this embodiment. One end of the elastic member 2221 is connected and contacted in the hole 2225. Opposite to the other end of the magnetic valve shaft center 2222, the other end of the elastic member 2221 is connected to contact the inner bottom of the hole 2225. An electromagnetic coil 2227 surrounds the outside of the magnetic valve body 2224. The two ends of the electromagnetic coil 2227 are electrically connected to the positive and negative terminals of a power source corresponding to the fan 1. Therefore, when the fan 1 is powered on, the electromagnetic coil 2227 is made to operate. It will also receive the power source and convert the electrical energy into magnetic energy, so that the magnetic valve body 2224 is excited (or excited), so that the magnetic valve body 2224 generates magnetic force and adsorbs the magnetic valve axis 2222, and the attracted magnetic valve axis 2222 moves downward toward the bottom of the hole 2225, at the same time, the other end of the magnetic valve shaft center 2222 abuts against the elastic member 2221, so that the elastic member 2221 is in a compressed state (as shown in FIG. 3), at this time The plurality of second teeth 2211 of the second braking portion 221 are separated from the plurality of first teeth 2111 of the first braking portion 211 without generating a braking effect (as shown in FIGS. 2 and 2A). When the aforementioned fan 1 is powered off, the electromagnetic coil 2227 also stops receiving power, so that the magnetic valve body 2224 is not excited and loses the magnetic force supply, so that the force of the magnetic valve shaft center 2222 against the elastic member 2221 disappears, so that The elastic member 2221 recovers from the compressed state to provide an elastic force. The magnetic valve shaft center 2222 is pushed by the elastic force of the elastic member 2221 to return to the unexcited position of the magnetic valve body 2224. At the same time, the second braking portion 221 will also move upward with respect to the first braking portion 211 as the magnetic valve shaft center 2222 is pushed by the elastic force of the elastic member 2221, so that the plurality of second teeth 2211 of the second braking portion 221 and the opposite The plurality of first teeth 2111 of the first braking portion 211 should be engaged (as shown in Figs. 2B and 2C), so as to achieve the effect of braking. In addition, the aforementioned magnetic valve body 2224 is provided with at least one restricting groove 2226. The restricting groove 2226 is formed by recessing the inside of the hole 2225 and communicates with the hole 2225. The magnetic valve shaft center 2222 is provided on the outer peripheral side. A restricting protrusion 2223 extends into the restricting groove 2226 to restrict the restricting protrusion 2223 from moving upward and downward in the restricting groove 2226. The bracket 23 is provided with a convex ring portion 231 and a clamping portion 232. The convex ring portion 231 is ring-shaped on the outer peripheral side of the bracket 23, and one side surface of the convex ring portion 231 is closely abutted on the shaft seat. On the outer side of the bottom of 111, the latching portion 232 is formed by one end of the bracket 23 protruding upward, and the latching portion 232 is engaged with the second opening 114 opposite to the shaft base 111, so that the bracket 23 is fixed to the bracket 23. This frame body 11 is on. Therefore, through the design of the fan braking structure of the present invention, a better braking effect can be effectively achieved. In addition, when the power is turned off, the first teeth 2111 of the first braking portion 211 of the first braking mechanism 21 and the second teeth 2211 of the second braking portion 221 corresponding to the second braking mechanism 22 of the present invention are used. The meshing makes it possible to accelerate the stall of the fan wheel 12, and the fan brake structure of the present invention is faster than the braking of the conventional brake circuit. In addition, since the fan brake structure of the present invention is a peripheral device, it has good commonality and can be applied to various series of fans without having to change the original circuit board again.

1‧‧‧fan

11‧‧‧Frame

111‧‧‧Shaft

113‧‧‧First opening

114‧‧‧ second opening

12‧‧‧ Fan Wheel

121‧‧‧Axis

122‧‧‧ Wheel

123‧‧‧ Blade

13‧‧‧ magnetic parts

14‧‧‧ stator set

2‧‧‧brake device

21‧‧‧The first brake mechanism

211‧‧‧First brake unit

2111‧‧‧first tooth

22‧‧‧Second brake mechanism

221‧‧‧Second brake unit

2211‧‧‧Second tooth

222‧‧‧Magnetic valve section

2221‧‧‧Elastic piece

2222‧‧‧Magnetic valve shaft

2223‧‧‧ Restricted Convex

2224‧‧‧Magnetic valve body

2225‧‧‧hole

2226‧‧‧ Restricted groove

2227‧‧‧Electromagnetic coil

23‧‧‧ bracket

231‧‧‧ convex ring

232‧‧‧Card

FIG. 1A is an exploded perspective view of an embodiment of the present invention. FIG. 1B is another exploded perspective view of an embodiment of the present invention. FIG. 2 is a schematic partial sectional view of a combination of one embodiment of the present invention. Fig. 2A is a partially enlarged schematic diagram of Fig. 2 of the present invention. FIG. 2B is another schematic partial partial cross-sectional view of an embodiment of the present invention. Figure 2C is a partially enlarged schematic diagram of Figure 2B of the present invention. FIG. 3 is a schematic sectional view of an embodiment of the present invention.

Claims (9)

A fan brake structure includes: a fan having a frame body and a fan wheel, the frame body having a shaft seat, the shaft seat being provided with a first opening and a second opening connected to the first opening, the fan The wheel is accommodated in the frame body, and the fan wheel has an axis center pivotally connected to the shaft seat, and the free end of the axis center penetrates the first opening and is located between the first and second openings; a brake The device has a first brake mechanism, a second brake mechanism and a bracket. The first brake mechanism is connected to the free end of the shaft center in the shaft seat. The second brake mechanism is arranged in the bracket and the bracket It is opposite to the second opening opposite to the shaft seat; and when the fan is powered off, the braking device is not excited and the first and second braking mechanisms are engaged to generate a braking effect. The fan brake structure according to item 1 of the scope of patent application, wherein the first brake mechanism is provided with a first brake portion, the first brake portion has a plurality of first wedge-shaped teeth, and the first teeth are formed in the first On one side surface of a braking portion, the other side surface of the first braking portion is connected to the free end of the shaft center in the shaft seat. The fan brake structure according to item 2 of the scope of patent application, wherein the second brake mechanism is provided with a second brake portion and a magnetic valve portion, the second brake portion has a plurality of wedge-shaped second teeth, and the second Teeth are formed on one side surface of the second braking portion, and the second tooth system is engaged or separated from the first teeth. The magnetic valve portion is disposed in the bracket, and One end of the magnetic valve portion is connected to the other side surface opposite to the second braking portion. The fan brake structure according to item 3 of the patent application scope, wherein the magnetic valve portion is provided with an elastic member, a magnetic valve shaft center, and a magnetic valve body, and the magnetic valve body has a hole formed in the At the center of the magnetic valve body, and an electromagnetic coil surrounds the outside of the magnetic valve body, one end of the magnetic valve shaft center is connected to the other side surface opposite to the second braking portion, and the other end thereof protrudes into the hole. An elastic member is accommodated in the hole and located between the magnetic valve shaft center and the magnetic valve body, and the magnetic valve body is magnetized to attract the magnetic valve shaft center toward the bottom of the hole and compress the elastic member. . The fan brake structure according to item 4 of the scope of patent application, wherein when the elastic member is compressed and the magnetic valve body is not excited, an elastic force is provided through the elastic member to push the magnetic valve shaft toward the first braking portion. Move in the direction. The fan brake structure according to item 1 of the scope of patent application, wherein when the fan is powered on, the braking device is excited to make the first and second braking mechanisms phase-separate and have no braking effect. The fan brake structure according to item 4 of the scope of patent application, wherein the bracket is provided with a convex ring portion and a clip portion, the convex ring portion is ring-shaped on the outer peripheral side of the bracket, and one side of the convex ring portion The surface closely fits on the outer side of the bottom of the shaft seat, the clamping portion is formed by one end of the bracket protruding upward, and is engaged with the second opening opposite to the shaft seat. The fan brake structure according to item 4 of the patent application scope, wherein the elastic member is a coil spring. The fan brake structure according to item 4 of the scope of patent application, wherein the magnetic valve body is provided with at least one restriction groove, the restriction groove is formed by recessing the inside of the hole, and the magnetic valve is communicated with the hole. At least one restricting protrusion is provided on the outer peripheral side of the shaft center, and the restricting protrusion extends into the restricting groove to restrict the restricting protrusion from moving upward and downward in the restricting groove.