Outer rotor brushless motor with heat dissipation device

Abstract

The utility model relates to an outer rotor brushless motor with heat dissipation device belongs to outer rotor brushless motor technical field, the utility model discloses a motor shell, the inner wall of motor shell is fixedly connected with stator, the lateral wall of motor shell is fixedly connected with the protection cover, the inner wall of motor shell is equipped with six arc grooves, the inner wall of six arc grooves is all fixedly connected with arc concave and convex board, starts motor, makes rotor rotate, drives the blade rotation, will form the airflow in the motor shell, the heat of stator will be taken away by the airflow, then, the airflow will circulate in a plurality of arc grooves and flow, let the heat in the airflow will conduct motor shell, then, start the heat dissipation fan rotation produces the airflow, makes motor shell keep lower temperature to the sustained absorption circulating airflow's heat, realizes the quick cooling of stator, effectively prevents the stator's winding part not directly with motor shell contact, leads to the heat to be difficult to transmit, easily causes the stator temperature to be too high.

Description

Technical Field

[0001] This invention relates to the field of external rotor brushless motor technology, and particularly to an external rotor brushless motor with a heat dissipation device. Background Technology

[0002] Unlike the common internal rotor motor (where the rotor rotates inside and the outer casing is fixed), the external rotor brushless motor is a special structure motor with the rotor on the outside and the stator inside. The stator, located at the center of the motor, is fixed and has copper coils wound around it, which is the core that generates the magnetic field. The rotor is wrapped around the stator and rotates around the stator through bearings. Permanent magnets are attached to the inner wall of the rotor. The external rotor brushless motor has advantages such as high torque, low speed, large moment of inertia, smooth operation, high power density and efficiency.

[0003] In brushless motors, the stator is often in close contact with the casing, allowing the heat generated by the stator to be conducted to the casing. The cooling fan then generates airflow to wash away the heat from the casing. However, the heat of the motor is mainly generated in the internal stator core and copper wire windings. In external rotor motors, since the stator is inside the rotor, it affects the release of stator heat, which may result in a slower heat conduction speed between the stator and the casing. This could lead to excessively high stator temperatures, affecting the stable operation of the motor. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art above, and to provide an external rotor brushless motor with a heat dissipation device.

[0005] An external rotor brushless motor with a heat dissipation device includes a motor housing, a stator fixedly connected to the inner wall of the motor housing, and a protective cover fixedly connected to the side wall of the motor housing. It also includes: The main body has a drive assembly rotatably mounted on its inner wall and an air blowing assembly mounted on its side wall. The drive assembly is used to drive the object to rotate. A circulation mechanism is installed on the inner wall of the main body to allow airflow to circulate. The reciprocating mechanism, located on the inner wall of the main mechanism, is used to enhance the airflow speed. The inner wall of the motor housing has six arc-shaped grooves, and each of the six arc-shaped grooves is fixedly connected to an arc-shaped concave-convex plate. A gear ring is rotatably connected to the inner wall of the motor housing. The arc-shaped concave-convex plates are made of aluminum alloy. When the motor needs to be started, the power is turned on, and the motor drives the object to rotate. During the operation of the motor, the airflow inside the motor housing is circulated through the circulation mechanism, which carries away the heat of the stator. This effectively prevents the stator windings from not being in direct contact with the motor housing, which would make it difficult to transfer heat and easily cause the stator temperature to be too high. The air blowing component then carries away the heat of the circulating airflow. Finally, the reciprocating mechanism increases the airflow speed, which can carry away even more heat.

[0006] The main institutions include: A drive assembly is rotatably mounted on the outer wall of the drive assembly and the inner wall of the motor housing, used to drive the object to rotate; An air blowing assembly is fixedly installed on the side wall of the air blowing assembly and the side wall of the motor housing to form an airflow to wash the outer wall of the motor housing. When the motor is running, the drive component drives the object to rotate. Then, the air blowing component is activated to generate airflow, which washes over the motor casing and removes the heat from the motor casing.

[0007] The circulation mechanism includes: Airflow assembly, which is fixedly installed on the inner wall of the motor housing, is used to circulate airflow; Alignment assembly, which is fixedly installed on the inner wall of the motor housing, is used to allow high-speed airflow to scour the stator windings; During motor operation, airflow is generated inside the motor housing. The airflow component allows the airflow to circulate within the motor housing. During the airflow circulation, heat is absorbed by the motor housing. Then, the blowing component generates airflow to flush the motor housing, carrying away the heat and preventing heat accumulation inside the motor housing. During airflow circulation, the alignment component accelerates the airflow speed.

[0008] Reciprocating mechanisms include: The speed change assembly is rotatably mounted on the inner wall of the motor housing to reduce the speed. A blocking assembly is slidably disposed on the inner wall of the motor housing to concentrate airflow; When the air blowing component rotates, it drives the speed changing component to rotate, causing the speed changing component to squeeze and move the sealing component, blocking the flow of air and causing the airflow to concentrate into the alignment component, which greatly increases the airflow speed and fully removes the heat from the stator.

[0009] The drive assembly includes a rotor rotatably connected to the inner wall of the motor housing, and the inner wall of the rotor is rotatably connected to the outer wall of the stator. The air blowing assembly includes a cooling fan rotatably connected to the inner wall of the motor housing, with the outer wall of the cooling fan rotatably connected to the inner wall of the protective cover; The process involves turning on the motor power supply, causing the rotor to rotate and driving the object to rotate. Then, turning on the power supply to the cooling fan causes the cooling fan to rotate and generate airflow to wash the motor casing.

[0010] The airflow assembly includes several blades fixedly connected to the side wall of the rotor, and an annular groove is formed on the inner wall of the motor housing. The operator starts the motor by connecting the power supply, causing the rotor to rotate and the object to rotate. As the rotor rotates, it drives the blades to rotate, creating airflow inside the motor housing. This airflow comes into contact with the stator, carrying away its heat. The airflow then enters multiple arc-shaped slots and flows within them. At this point, the airflow comes into contact with arc-shaped concave and convex plates. When the airflow passes over the convex surface of the arc-shaped concave and convex plates, the flow velocity increases due to the temporary narrowing of the flow channel in the arc-shaped slots. When the airflow passes over the concave surface, it creates localized small turbulence, changing the airflow state and ensuring full contact between the airflow and the arc-shaped concave and convex plates. Since the arc-shaped concave and convex plates and the motor housing are made of aluminum alloy, which has good thermal conductivity, the heat in the airflow is fully conducted to the arc-shaped concave and convex plates. The heat is then conducted to the motor housing through the arc-shaped concave and convex plates. After the heat is absorbed, the airflow flows to the position of the annular slot, where it is attracted again by the suction force generated by the blades and comes into contact with the stator again, absorbing the heat from the stator and causing the airflow to circulate inside the motor housing. When the motor power is turned on, the cooling fan power is also turned on, causing the cooling fan to rotate and generate airflow that washes over the outer wall of the motor housing. Because the curved concave-convex plate is close to the outer wall of the motor housing, heat is quickly conducted to the outer wall of the motor housing. The airflow generated by the cooling fan then directly exhausts the heat from the motor housing to the outside, keeping the motor housing at a lower temperature. This allows the cooling fan to continuously absorb heat from the internal circulating airflow, reducing the temperature of the stator. The rotating blades carry away the heat from the stator, and the curved concave-convex plate further enhances the heat exchange efficiency of the airflow. Finally, the motor housing is cooled down, achieving rapid cooling of the stator and preventing heat accumulation inside the motor housing. This effectively prevents the stator windings from not being in direct contact with the motor housing, which could lead to poor heat transfer and excessively high stator temperatures, thus ensuring stable motor operation.

[0011] The alignment assembly includes a flow divider ring fixedly connected to the inner wall of the annular groove. The inner wall of the flow divider ring has nine throttling holes, and the outer wall of the flow divider ring has six flow grooves. When the airflow reaches the annular groove, some of the airflow flows through the groove and continues to contact the stator, carrying away its heat. The other part of the airflow enters the throttling orifice, where the airflow area gradually decreases and the airflow velocity increases significantly. Since the throttling orifice is aligned with the stator windings and close to the stator center, the high-speed airflow flowing through the orifice generates a stronger impact force, resulting in a stronger scouring effect on the windings at that location and carrying away the heat. This effectively prevents the airflow from accumulating heat and causing excessively high temperatures in certain areas of the stator when the two windings are close together at the stator center, as this would reduce the airflow path and hinder the entry of the airflow.

[0012] The transmission assembly includes a gear fixedly connected to the side wall of the cooling fan, the outer wall of the gear meshing with the outer wall of the gear ring, and a protrusion fixedly connected to the side wall of the gear ring. When the cooling fan rotates, it drives the gear to rotate. When the gear meshes with the gear ring, it drives the gear ring to rotate. Since the outer diameter of the gear ring is larger than the outer diameter of the gear, there is a transmission ratio between the two. Therefore, the rotation speed of the gear ring is slower than that of the gear.

[0013] The sealing assembly includes a sliding ring slidably connected to the inner wall of the annular groove, a sliding rod fixedly connected to the side wall of the sliding ring, a sliding connection between the outer wall of the sliding rod and the inner wall of the motor housing, and a rubber sealing ring fixedly connected to the outer wall of the sliding rod to enhance the sealing between the sliding rod and the inner wall of the motor housing and prevent gas from leaking from that position when the sliding rod slides.

[0014] The sealing assembly also includes six spring return rods fixedly connected to the side of the sliding ring away from the sliding rod, and the outer wall of each of the six spring return rods is slidably connected to the inner wall of the diversion ring; When the gear ring rotates, it drives the protrusion to rotate. As the protrusion continues to rotate, its arc surface contacts the sliding rod, thus squeezing the sliding rod and causing it to move. This causes the sliding ring to move, which in turn drives the spring return rod to move, squeezing it and accumulating rebound force. As the sliding ring continues to move, it moves closer to the diverting ring, narrowing the flow path of the airflow into the flow groove and reducing the amount of airflow entering the flow groove. This allows more airflow to concentrate in the throttling orifice. As the gear ring continues to rotate, the protrusion separates from the sliding ring. At this point, the rebound force of the spring return rod is released, allowing the sliding ring to return to its original position and allowing the airflow to pass through the flow groove normally until the protrusion squeezes the sliding rod again. This process repeats, intermittently increasing the airflow rate ejected from the throttling orifice, enhancing the heat dissipation effect, and effectively removing heat from the stator windings in close proximity.

[0015] The present invention has the following beneficial effects: (1) When using this invention, the operator turns on the power of the motor, starts the motor, and makes the rotor rotate, which drives the object to rotate. When the rotor rotates, it will drive the blades to rotate, which will form an airflow in the motor housing. The airflow will carry away the heat of the stator. Then, the airflow will flow in multiple arc-shaped slots. The airflow component allows the airflow to fully contact the arc-shaped concave and convex plates, so that the heat in the airflow will be conducted to the motor housing. Then, the cooling fan is started to rotate, generating airflow, which washes the outer wall of the motor housing, and the heat of the motor housing will be directly discharged to the outside, keeping the motor housing at a low temperature. This continuously absorbs the heat of the internal circulating airflow, reduces the temperature of the stator, achieves rapid cooling of the stator, avoids the accumulation of heat in the motor housing, and effectively prevents the stator winding part from not directly contacting the motor housing, which makes it difficult to transfer heat and easily causes the stator temperature to be too high, thereby ensuring the stable operation of the motor.

[0016] (2) When the airflow reaches the position of the annular groove, part of the airflow will flow through the flow groove and continue to contact the stator, taking away the heat of the stator. Another part of the airflow will enter the throttling hole, the flow area of ​​the airflow will gradually decrease, and the airflow speed will increase significantly. Since the throttling hole is aligned with the winding of the stator and close to the center of the stator, the high-speed airflow flowing from the throttling hole will generate a stronger impact force, and the scouring force of the winding at this position will be stronger, taking away the heat at this position. This effectively prevents the two windings at this position from being too close together when the winding is close to the center of the stator, the flow path of the airflow is small, which affects the entry of the airflow and easily causes heat accumulation at this position, resulting in excessively high temperature in some areas of the stator.

[0017] (3) When the cooling fan rotates, the gear will rotate. When the gear meshes with the gear ring, it will drive the gear ring to rotate, which will drive the protrusion to rotate. The arc surface of the protrusion will squeeze the sliding rod to move, causing the sliding ring to move. Through the sealing component, the sliding ring will occupy space, reducing the airflow entering the flow groove and allowing more airflow to concentrate in the throttling hole. As the gear ring continues to rotate, the protrusion will separate from the sliding ring. At this time, the spring return rod will release its elasticity, allowing the sliding ring to return to its original position, so that the airflow can flow normally through the flow groove until the protrusion squeezes the sliding rod to move again. This process is repeated, thereby intermittently increasing the airflow rate ejected from the throttling hole and fully carrying away the heat of the stator winding in the close proximity position.

[0018] (4) By forming an airflow inside the motor housing, the present invention allows the airflow to circulate and absorb heat inside the motor housing, thus making it difficult for dust from the external environment to penetrate the inside of the motor housing during motor operation. This keeps the stator surface clean, ensures stable heat conduction, and ensures that the heat of the stator is quickly dissipated to the position of the arc-shaped concave-convex plate. This effectively prevents the airflow inside the motor housing from communicating with the outside, which could easily cause external dust to adhere to the stator surface and affect heat conduction. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a cross-sectional view of the motor housing of the present invention; Figure 4 This is a schematic cross-sectional view of the rotor of the present invention; Figure 5 This is a schematic cross-sectional view of the stator of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram at point A in the middle; Figure 7 For the present invention Figure 5 Schematic diagram at point B in the middle; Figure 8 This is a schematic diagram of the left cross-section of the motor housing of the present invention; Figure 9 This is an exploded view of the main structure of the present invention.

[0020] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Main body; 11. Drive assembly; 12. Air blowing assembly; 111. Motor housing; 112. Rotor; 113. Stator; 121. Protective cover; 122. Cooling fan; 2. Circulation mechanism; 21. Airflow assembly; 22. Alignment assembly; 211. Blade; 212. Arc groove; 213. Arc concave-convex plate; 214. Annular groove; 221. Flow divider ring; 222. Throttling orifice; 223. Flow groove; 3. Reciprocating mechanism; 31. Speed ​​change assembly; 32. Sealing assembly; 311. Gear; 312. Gear ring; 313. Protrusion; 321. Sliding ring; 322. Sliding rod; 323. Spring return rod. Detailed Implementation

[0021] Please see Figures 1 to 4 This is an embodiment of the present invention.

[0022] An external rotor brushless motor with a heat dissipation device includes a motor housing 111, a stator 113 fixedly connected to the inner wall of the motor housing 111, and a protective cover 121 fixedly connected to the side wall of the motor housing 111. The motor housing 111 is made of aluminum alloy. The main body 1 has a drive assembly 11 rotatably mounted on its inner wall and an air blowing assembly 12 mounted on its side wall. The drive assembly 11 is used to drive the object to rotate. Circulation mechanism 2, installed on the inner wall of the main body 1, is used to circulate airflow; and Reciprocating mechanism 3, located on the inner wall of main mechanism 1, is used to enhance the airflow speed; The inner wall of the motor housing 111 has six arc-shaped grooves 212, and the inner wall of each of the six arc-shaped grooves 212 is fixedly connected with an arc-shaped concave-convex plate 213. The inner wall of the motor housing 111 is rotatably connected with a gear ring 312. The arc-shaped concave-convex plate 213 is made of aluminum alloy. When the motor needs to be started, the power is turned on to drive the object to rotate. During the operation of the motor, the airflow inside the motor housing 111 is circulated through the circulation mechanism 2, which carries away the heat of the stator 113. This effectively prevents the winding part of the stator 113 from not being in direct contact with the motor housing 111, which would make it difficult to transfer heat and easily cause the stator 113 to overheat. The air blowing component 12 then carries away the heat of the circulating airflow. Finally, the reciprocating mechanism 3 increases the airflow speed, which can carry away more heat.

[0023] Main body 1 includes: The drive assembly 11 is rotatably mounted on the outer wall of the drive assembly 11 and the inner wall of the motor housing 111, and is used to drive the object to rotate. The air blowing assembly 12 is fixedly installed on the side wall of the motor housing 111 to form an airflow to wash the outer wall of the motor housing 111. When the motor is running, the drive component 11 drives the object to rotate. Then, the air blowing component 12 is activated to generate airflow, which washes over the motor housing 111 and removes the heat from the motor housing 111.

[0024] The circulation mechanism 2 includes: Airflow assembly 21 is fixedly installed on the inner wall of motor housing 111 for circulating airflow; Alignment component 22 is fixedly disposed on the inner wall of motor housing 111 and is used to allow high-speed airflow to scour the windings of stator 113. During motor operation, airflow is generated inside the motor housing 111. The airflow is circulated inside the motor housing 111 by the airflow assembly 21. During the airflow circulation, heat is absorbed by the motor housing 111. Then, the airflow is generated by the blowing assembly 12 to flush the motor housing 111 and carry away the heat from the motor housing 111, preventing heat from accumulating inside the motor housing 111. During airflow circulation, the alignment assembly 22 accelerates the airflow speed.

[0025] Reciprocating mechanism 3 includes: The speed change assembly 31 is rotatably disposed on the inner wall of the motor housing 111 to reduce the speed; The blocking component 32 is slidably disposed on the inner wall of the motor housing 111 to concentrate the airflow; When the air blowing component 12 rotates, it drives the speed change component 31 to rotate, causing the speed change component 31 to squeeze and block the movement of the sealing component 32, blocking the flow of air and causing the airflow to concentrate into the alignment component 22, which greatly increases the airflow speed and fully removes the heat of the stator 113.

[0026] Please see Figures 1 to 9 This is Embodiment Two of the present invention.

[0027] A brushless motor with a heat dissipation device, based on Embodiment 1, includes a drive assembly 11 comprising a rotor 112 rotatably connected to the inner wall of the motor housing 111, and the inner wall of the rotor 112 being rotatably connected to the outer wall of the stator 113. The air blowing assembly 12 includes a cooling fan 122 rotatably connected to the inner wall of the motor housing 111. The outer wall of the cooling fan 122 is rotatably connected to the inner wall of the protective cover 121. The specific model of the cooling fan 122 is: V92E-A7. When the motor power is turned on, the rotor 112 will rotate, driving the object to rotate. Then, the power to the cooling fan 122 will be turned on, causing the cooling fan 122 to rotate and generate airflow to wash the motor housing 111.

[0028] The airflow assembly 21 includes several blades 211 fixedly connected to the side wall of the rotor 112, and an annular groove 214 is provided on the inner wall of the motor housing 111. The operator starts the motor by connecting the power supply, causing the rotor 112 to rotate, which in turn rotates the object. As the rotor 112 rotates, it drives the blades 211 to rotate, creating airflow within the motor housing 111. This airflow contacts the stator 113, carrying away its heat. The airflow then enters multiple arc-shaped grooves 212 and flows within them. At this point, the airflow contacts the arc-shaped concave-convex plates 213. When the airflow passes over the convex surface of the arc-shaped concave-convex plates 213, the flow velocity increases briefly due to the narrowing of the flow channels in the arc-shaped grooves 212. When the airflow passes over the concave surface, it will form local small turbulence, change the airflow state, and promote the airflow to fully contact the arc-shaped concave-convex plate 213. Since the arc-shaped concave-convex plate 213 and the motor housing 111 are made of aluminum alloy, which has good thermal conductivity, the heat in the airflow will be fully conducted to the arc-shaped concave-convex plate 213. The heat will then be conducted to the motor housing 111 through the arc-shaped concave-convex plate 213. After the heat is absorbed, the airflow will flow to the position of the annular groove 214, and will be attracted again by the suction force generated by the blade 211, and will contact the stator 113 again, absorbing the heat of the stator 113, so that the airflow circulates inside the motor housing 111. When the motor power is turned on, the cooling fan 122 is also powered on, causing the cooling fan 122 to rotate and generate airflow that washes over the outer wall of the motor housing 111. Since the arc-shaped concave-convex plate 213 is close to the outer wall of the motor housing 111, heat is quickly conducted to the outer wall of the motor housing 111. The airflow generated by the cooling fan 122 directly exhausts the heat of the motor housing 111 to the outside, keeping the motor housing 111 at a lower temperature. This allows the motor housing 111 to continuously absorb heat from the internal circulating airflow, reducing the temperature of the stator 113. The rotation of the blades 211 carries away the heat from the stator 113. Then, the arc-shaped concave-convex plate 213 enhances the heat exchange efficiency of the airflow. Finally, the motor housing 111 is cooled down, achieving rapid cooling of the stator 113. This prevents heat from accumulating inside the motor housing 111 and effectively prevents the stator 113 from overheating because the winding part of the stator 113 is not in direct contact with the motor housing 111. This ensures stable operation of the motor.

[0029] The alignment component 22 includes a diversion ring 221 fixedly connected to the inner wall of the annular groove 214. The inner wall of the diversion ring 221 has nine throttling holes 222 and the outer wall of the diversion ring 221 has six flow grooves 223. When the airflow reaches the annular groove 214, part of the airflow will flow through the flow groove 223 and continue to contact the stator 113, carrying away the heat of the stator 113. The other part of the airflow will enter the throttling orifice 222, where the flow area of ​​the airflow will gradually decrease and the airflow speed will significantly increase. Since the throttling orifice 222 is aligned with the winding of the stator 113 and is close to the center of the stator 113, the high-speed airflow flowing from the throttling orifice 222 will generate a stronger impact force, which will have a stronger scouring force on the winding at that position and carry away the heat at that position. This effectively prevents the two windings at the center of the stator 113 from being too close together, resulting in a smaller airflow path and affecting the entry of the airflow, which could easily cause heat accumulation at that position and cause the temperature of some areas of the stator 113 to be too high.

[0030] The transmission assembly 31 includes a gear 311 fixedly connected to the side wall of the cooling fan 122. The outer wall of the gear 311 meshes with the outer wall of the gear ring 312. A protrusion 313 is fixedly connected to the side wall of the gear ring 312. When the cooling fan 122 rotates, it drives the gear 311 to rotate. When the gear 311 meshes with the gear ring 312, it drives the gear ring 312 to rotate. Since the outer diameter of the gear ring 312 is larger than the outer diameter of the gear 311, there is a transmission ratio between the two. Therefore, the rotation speed of the gear ring 312 is slower than that of the gear 311.

[0031] The sealing assembly 32 includes a sliding ring 321 slidably connected to the inner wall of the annular groove 214. A sliding rod 322 is fixedly connected to the side wall of the sliding ring 321. The outer wall of the sliding rod 322 is slidably connected to the inner wall of the motor housing 111. A rubber sealing ring is fixedly connected to the outer wall of the sliding rod 322. Figure 6 The position of G in the middle is used to enhance the sealing between the sliding rod 322 and the inner wall of the motor housing 111, and to prevent gas from leaking from this position when the sliding rod 322 slides.

[0032] The sealing assembly 32 also includes six spring return rods 323 fixedly connected to the side of the sliding ring 321 away from the sliding rod 322. The outer walls of the six spring return rods 323 are slidably connected to the inner wall of the diversion ring 221. When the gear ring 312 rotates, it drives the protrusion 313 to rotate. As the protrusion 313 continues to rotate, its arc surface contacts the sliding rod 322, thereby squeezing the sliding rod 322 to move. This causes the sliding ring 321 to move, which in turn drives the spring return rod 323 to move, subjecting it to compression and accumulating rebound force. As the sliding ring 321 continues to move, it approaches the diverting ring 221, narrowing the flow path of the airflow into the flow groove 223 and reducing the amount of air entering the flow groove 223. The flow allows more airflow to concentrate into the throttling orifice 222. As the gear ring 312 continues to rotate, the protrusion 313 will separate from the sliding ring 321. At this time, the spring return rod 323 will release its restoring force, allowing the sliding ring 321 to return to its original position, so that the airflow can flow normally through the flow groove 223 until the protrusion 313 squeezes the sliding rod 322 to move again. This process is repeated, thereby intermittently increasing the airflow rate ejected from the throttling orifice 222, enhancing the heat dissipation effect, and fully removing the heat from the close proximity of the stator 113 windings.

[0033] The number of the above components is not limited. Those skilled in the art can set it freely according to actual needs, as long as the above components are installed at the corresponding component connection positions.

[0034] In the second embodiment, the operator starts the motor by connecting the power supply, causing the rotor 112 to rotate and drive the object to rotate. As the rotor 112 rotates, it drives the blades 211 to rotate. The rotation of the blades 211 creates airflow within the motor housing 111. This airflow contacts the stator 113, carrying away its heat. The airflow then enters multiple arc-shaped grooves 212 and flows within them. At this time, the airflow contacts the arc-shaped concave-convex plates 213. When the airflow passes over the convex surface of the arc-shaped concave-convex plates 213, the flow velocity increases due to the temporary narrowing of the flow channels in the arc-shaped grooves 212. When the airflow passes over the concave surface, it will form local small turbulence, change the airflow state, and promote the airflow to fully contact the arc-shaped concave-convex plate 213. Since the arc-shaped concave-convex plate 213 and the motor housing 111 are made of aluminum alloy, which has good thermal conductivity, the heat in the airflow will be fully conducted to the arc-shaped concave-convex plate 213. The heat will then be conducted to the motor housing 111 through the arc-shaped concave-convex plate 213. After the heat is absorbed, the airflow will flow to the position of the annular groove 214, and will be attracted again by the suction force generated by the blade 211, and will contact the stator 113 again, absorbing the heat of the stator 113, so that the airflow circulates inside the motor housing 111. When the motor power is turned on, the power to the cooling fan 122 is also turned on, causing the cooling fan 122 to rotate and generate airflow, which washes the outer wall of the motor housing 111. Since the arc-shaped concave-convex plate 213 is close to the outer wall of the motor housing 111, heat is quickly conducted to the outer wall of the motor housing 111. The airflow generated by the cooling fan 122 directly exhausts the heat of the motor housing 111 to the outside, keeping the motor housing 111 at a low temperature, thereby continuously absorbing the heat of the internal circulating airflow and reducing the temperature of the stator 113. The rotation of the blades 211 carries away the heat of the stator 113. Then, the arc-shaped concave-convex plate 213 enhances the heat exchange efficiency of the airflow. Finally, the motor housing 111 is cooled down, achieving rapid cooling of the stator 113 and preventing heat accumulation inside the motor housing 111. This effectively prevents the winding part of the stator 113 from not directly contacting the motor housing 111, which would make heat transfer difficult and easily cause the stator 113 to overheat, thus ensuring the stable operation of the motor. When the airflow reaches the position of the annular groove 214, part of the airflow will flow through the flow groove 223 and continue to contact the stator 113, carrying away the heat of the stator 113. The other part of the airflow will enter the throttling orifice 222. The flow area of ​​the airflow will gradually decrease and the airflow speed will increase significantly. Since the throttling orifice 222 is aligned with the winding of the stator 113 and is close to the center of the stator 113, the high-speed airflow flowing from the throttling orifice 222 will generate a stronger impact force and a stronger scouring force on the winding at this position, carrying away the heat at this position. This effectively prevents the two windings at this position from being too close together and the flow path of the airflow from being too small when the winding is close to the center of the stator 113, which would affect the entry of the airflow and easily cause heat accumulation at this position, resulting in excessively high temperature in some areas of the stator 113. When the cooling fan 122 rotates, it drives the gear 311 to rotate. When the gear 311 meshes with the gear ring 312, it drives the gear ring 312 to rotate. Since the outer diameter of the gear ring 312 is larger than that of the gear 311, there is a transmission ratio between them. Therefore, the rotation speed of the gear ring 312 is slower than that of the gear 311. When the gear ring 312 rotates, it drives the protrusion 313 to rotate. As the protrusion 313 continues to rotate, the arc surface of the protrusion 313 will contact the sliding rod 322, thereby squeezing the sliding rod 322 to move, causing the sliding ring 321 to move, which in turn drives the spring return rod 323 to move, so that it is squeezed and accumulates the rebound force. As the sliding ring 321 continues to move, it will approach the diverting ring 221, narrowing the flow path of the airflow into the flow groove 223 and reducing the amount of airflow entering the flow groove 223. This allows more airflow to concentrate in the throttling orifice 222. As the gear ring 312 continues to rotate, the protrusion 313 will separate from the sliding ring 321. At this time, the spring return rod 323 will release its restoring force, allowing the sliding ring 321 to return to its original position and allowing the airflow to flow normally through the flow groove 223 until the protrusion 313 squeezes the sliding rod 322 to move again. This process repeats, thereby intermittently increasing the airflow rate ejected from the throttling orifice 222, enhancing the heat dissipation effect, and fully removing the heat from the close proximity of the stator 113 windings. By creating airflow within the motor housing 111 and circulating the airflow inside the motor housing 111 to absorb and conduct heat, dust from the external environment is less likely to penetrate the interior of the motor housing 111 during motor operation. This keeps the surface of the stator 113 clean, ensures stable heat conduction, and ensures that the heat of the stator 113 is quickly dissipated to the position of the arc-shaped concave-convex plate 213. This effectively prevents the airflow inside the motor housing 111 from communicating with the outside, which would easily cause external dust to adhere to the surface of the stator 113 and affect heat conduction.

Claims

1. An external rotor brushless motor with a heat dissipation device, comprising a motor housing (111), wherein a stator (113) is fixedly connected to the inner wall of the motor housing (111), and a protective cover (121) is fixedly connected to the side wall of the motor housing (111), characterized in that, Also includes: The main body (1) has a drive assembly (11) rotatably mounted on its inner wall and an air blowing assembly (12) mounted on its side wall. The drive assembly (11) is used to drive the object to rotate. The circulation mechanism (2) is installed on the inner wall of the main body (1) to allow airflow to circulate; The reciprocating mechanism (3) is located on the inner wall of the main body mechanism (1) and is used to enhance the flow speed of the airflow. The inner wall of the motor housing (111) is provided with six arc-shaped grooves (212), and arc-shaped concave and convex plates (213) are fixedly connected to the inner wall of each of the six arc-shaped grooves (212). A gear ring (312) is rotatably connected to the inner wall of the motor housing (111). When the motor needs to be started, the power is turned on to drive the object to rotate. During the operation of the motor, the airflow inside the motor housing (111) is circulated through the circulation mechanism (2) to carry away the heat of the stator (113). Then, the heat of the circulating airflow is carried away through the air blowing assembly (12). Finally, the airflow speed is increased through the reciprocating mechanism (3). The circulation mechanism (2) includes: Airflow assembly (21), which is fixedly installed on the inner wall of the motor housing (111) for circulating airflow; Alignment component (22), which is fixedly disposed on the inner wall of the motor housing (111) for allowing high-speed airflow to scour the windings of the stator (113); During the operation of the motor, airflow is generated inside the motor housing (111). The airflow is circulated inside the motor housing (111) by the airflow assembly (21). During the airflow circulation, heat is absorbed by the motor housing (111). During the airflow circulation, the airflow speed is accelerated by the alignment assembly (22). The reciprocating mechanism (3) includes: The speed change assembly (31) is rotatably disposed on the inner wall of the motor housing (111) for reducing the speed; A blocking assembly (32) is slidably disposed on the inner wall of the motor housing (111) for concentrating airflow; When the blowing assembly (12) rotates, it will drive the speed change assembly (31) to rotate, causing the speed change assembly (31) to squeeze and block the sealing assembly (32) to move, blocking the flow of air and allowing the air to concentrate and enter the alignment assembly (22); The alignment component (22) includes a diversion ring (221) fixedly connected to the inner wall of the annular groove (214). The inner wall of the diversion ring (221) is provided with nine throttling holes (222), and the outer wall of the diversion ring (221) is provided with six flow grooves (223). When the airflow reaches the position of the annular groove (214), part of the airflow will enter the throttling hole (222), and be pressurized through the throttling hole (222) and sprayed out to the side of the two windings of the stator (113) that are close to each other, taking away the heat of the windings; The sealing assembly (32) includes a sliding ring (321) slidably connected to the inner wall of the annular groove (214), a sliding rod (322) fixedly connected to the side wall of the sliding ring (321), and the outer wall of the sliding rod (322) slidably connected to the inner wall of the motor housing (111).

2. The external rotor brushless motor with a heat dissipation device according to claim 1, characterized in that: The main structure (1) includes: The drive assembly (11) is rotatably mounted on the outer wall of the drive assembly (111) and the inner wall of the motor housing (111) to drive the object to rotate. The blowing assembly (12) is fixedly installed at the side wall of the blowing assembly (12) and the side wall of the motor housing (111) to form an airflow to wash the outer wall of the motor housing (111); When the motor is running, the object is driven to rotate by the drive component (11). Then, the air blowing component (12) is activated to generate airflow, which washes the motor housing (111) and removes the heat from the motor housing (111).

3. The external rotor brushless motor with a heat dissipation device according to claim 1, characterized in that: The drive assembly (11) includes a rotor (112) rotatably connected to the inner wall of the motor housing (111), and the inner wall of the rotor (112) is rotatably connected to the outer wall of the stator (113). The air blowing assembly (12) includes a cooling fan (122) rotatably connected to the inner wall of the motor housing (111), and the outer wall of the cooling fan (122) is rotatably connected to the inner wall of the protective cover (121). In this process, by turning on the power supply to the motor, the rotor (112) will rotate, driving the object to rotate. Then, the power supply to the cooling fan (122) will be turned on, causing the cooling fan (122) to rotate and generate airflow to scour the motor casing (111).

4. The external rotor brushless motor with a heat dissipation device according to claim 1, characterized in that: The airflow assembly (21) includes several blades (211) fixedly connected to the side wall of the rotor (112), and an annular groove (214) is provided on the inner wall of the motor housing (111). When the rotor (112) rotates, it will drive the blades (211) to rotate, generating airflow that flows inside the motor housing (111). The airflow will come into contact with the stator (113) and absorb the heat of the stator. Afterward, the airflow will circulate between the arc groove (212) and the annular groove (214). During the flow process, the heat in the airflow will be absorbed by the motor housing (111).

5. A brushless external rotor motor with a heat dissipation device according to claim 1, characterized in that: The speed change assembly (31) includes a gear (311) fixedly connected to the side wall of the cooling fan (122), the outer wall of the gear (311) meshing with the outer wall of the gear ring (312), and a protrusion (313) fixedly connected to the side wall of the gear ring (312). When the cooling fan (122) rotates, it will drive the gear (311) to rotate, thereby causing the gear ring (312) to rotate. Since the outer diameter of the gear (311) is smaller than the outer diameter of the gear ring (312), there is a large transmission ratio between the two, so that the speed of the gear ring (312) is lower than that of the gear (311).

6. The external rotor brushless motor with a heat dissipation device according to claim 1, characterized in that: The sealing assembly (32) further includes six spring return rods (323) fixedly connected to the side of the sliding ring (321) away from the sliding rod (322), and the outer wall of each of the six spring return rods (323) is slidably connected to the inner wall of the diversion ring (221); When the gear ring (312) rotates, it will drive the protrusion (313) to rotate, causing the protrusion (313) to squeeze the sliding rod (322), causing the sliding ring (321) to move, blocking the flow groove (223), and allowing the airflow to concentrate into the throttling hole (222).

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