Brushless motor with good heat dissipation effect

Abstract

The utility model relates to the technical field of brushless motors, in particular to a brushless motor with a good heat dissipation effect. According to the technical scheme, the fan comprises a main body, a rotor is installed in the main body, an output shaft is fixedly installed on the rotor, the fan further comprises a transmission shaft fixedly installed on the rotor, fan blades and an energy storage assembly are rotatably installed on the transmission shaft, and the energy storage assembly releases kinetic energy to drive the fan blades to rotate reversely when the transmission shaft stops rotating. The contraction assembly is connected with the energy storage assembly. According to the utility model, through the energy storage assembly and the contraction assembly, when the motor rotates, the scraping plate is not contacted with the dustproof net, dust scraped by the scraping plate is prevented from entering the motor along with airflow, and when the motor stops rotating, the dust is discharged to the outer side of the motor. Therefore, blockage caused by long-time use of dust can be prevented, the smoothness of air circulation in the motor is ensured, and the heat dissipation effect in the motor can be effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to a brushless motor with good heat dissipation effect. Background Art

[0002] A brushless motor, also known as a brushless DC motor, is a type of motor that uses electronic commutation technology. It abandons the brushes and commutators in traditional brushed motors, thus getting the name "brushless". A brushless motor mainly consists of two parts: a stator and a rotor. The stator is the stationary part of the motor, usually composed of winding coils; the rotor is the rotating part of the motor, usually composed of permanent magnets.

[0003] When the motor is running, certain energy losses will occur, and these energies will be manifested as heat. Therefore, it is necessary to dissipate heat from the motor when it is rotating. Generally, a fan blade is installed on the transmission shaft fixedly connected to the rotor. When the motor rotates, the fan blade is synchronously driven to rotate, thereby increasing the air flow rate and realizing heat dissipation of the motor. Generally, a dust-proof net is provided at the ventilation opening of the motor. When the dust-proof net is used for a long time, it may become blocked, which will increase the resistance during air flow and thus be unfavorable for heat dissipation, but the motor cannot work anymore. The dust-proof net needs to be self-cleaned. Content of the Utility Model

[0004] The purpose of the utility model is to propose a brushless motor with good heat dissipation effect for the problems existing in the background art.

[0005] The technical solution of the utility model: A brushless motor with good heat dissipation effect, including a main body, a rotor is installed inside the main body, an output shaft is fixedly installed on the rotor, and further includes:

[0006] A transmission shaft fixedly installed on the rotor, and a fan blade is rotatably installed on the transmission shaft;

[0007] An energy storage component, which stores a part of the kinetic energy of the transmission shaft and then drives the fan blade to rotate when the transmission shaft rotates, and releases the kinetic energy to drive the fan blade to rotate in the reverse direction when the transmission shaft stops rotating;

[0008] A scraper slidably installed on the transmission shaft, a dust-proof component is installed on the main body, and the scraper cleans the dust-proof component;

[0009] A contraction component, which is connected to the energy storage component. The contraction component drives the scraper to disengage from the dust-proof component when the transmission shaft rotates, and drives the scraper to contact the dust-proof component when the energy storage component drives the fan blade to rotate.

[0010] Optionally, the energy storage component includes a driving sleeve rotatably mounted on the transmission shaft. A torsion spring is fixedly mounted on the driving sleeve, and the other end of the torsion spring is fixedly connected to the transmission shaft. A connecting rod is fixedly mounted between the fan blade and the driving sleeve.

[0011] Optionally, the dust-proof component includes a protective cover fixedly mounted inside the main body. A plurality of air holes are formed in the protective cover, and a dust-proof net is fixedly mounted inside the protective cover.

[0012] Optionally, the contraction component includes a plurality of telescopic rods rotatably mounted on the driving sleeve. The other end of the telescopic rod is rotatably connected to the scraping plate. A counterweight is fixedly mounted on the telescopic rod, and an elastic member is mounted between the scraping plate and the transmission shaft.

[0013] Optionally, a sliding rod is fixedly mounted on the scraping plate, a sliding groove is provided on the transmission shaft, and the sliding rod is slidably connected to the sliding groove.

[0014] Optionally, a spring is rotatably mounted on the transmission shaft, and the other end of the spring is rotatably connected to the scraping plate.

[0015] Optionally, rollers are rotatably mounted at both ends of the scraping plate, and convex blocks are provided on the rollers.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] When the motor rotates, the scraping plate does not contact the dust-proof net through the energy storage component and the contraction component, preventing the dust scraped by the scraping plate from entering the motor interior along with the air flow. When the motor stops rotating, the fan blade is driven to rotate in the reverse direction. At this time, the flow direction of the gas inside the motor is changed for a short time, and at the same time, the scraping plate contacts the dust-proof net, so that the dust can be discharged to the outside of the motor under the action of the air flow. Therefore, the dust-proof net can be prevented from being blocked after long-term use, ensuring the smoothness of the gas flow inside the motor and effectively ensuring the heat dissipation effect inside the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structural schematic diagram of the brushless motor of the present invention is given Figure I ;

[0019] Figure 2 The structural schematic diagram of the brushless motor of the present invention is given Figure II ;

[0020] Figure 3 The structural schematic diagram of the brushless motor of the present invention is given Figure III ;

[0021] Figure 4 It is the structural schematic diagram of the energy storage component;

[0022] Figure 5 It is a structural schematic diagram of a contraction component.

[0023] Reference numerals: 1, main body; 101, output shaft; 2, protective cover; 201, air hole; 202, dust-proof net; 3, transmission shaft; 301, fan blade; 4, drive sleeve; 401, torsion spring; 402, connecting rod; 5, scraper; 501, telescopic rod; 502, counterweight; 503, sliding rod; 504, spring; 6, roller; 601, convex block. Detailed implementation manners

[0024] The technical solutions of the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Embodiment

[0026] As Figures 1 - 3 shown, a brushless motor with good heat dissipation proposed by the present utility model includes a main body 1, a rotor is installed inside the main body 1, and an output shaft 101 is fixedly installed on the rotor. When the motor is started, the rotor will drive the output shaft 101 to rotate inside the main body 1 (this is prior art and will not be elaborated here).

[0027] As Figure 1 and Figure 4 shown, this embodiment further includes a transmission shaft 3 fixedly installed on the rotor, and a fan blade 301 is rotatably installed on the transmission shaft 3. When the rotor rotates, it will drive the transmission shaft 3 to rotate at the same time. Here, the transmission shaft 3 and the fan blade 301 are rotatably connected, so the rotating transmission shaft 3 will not drive the fan blade 301 to rotate.

[0028] As Figures 4 - 5 shown, this embodiment further includes an energy storage component. When the transmission shaft 3 rotates, the energy storage component stores a part of the kinetic energy of the transmission shaft 3 and then drives the fan blade 301 to rotate. When the transmission shaft 3 stops rotating, the energy storage component releases the kinetic energy to drive the fan blade 301 to rotate in the reverse direction. The energy storage component includes a drive sleeve 4 rotatably installed on the transmission shaft 3, a torsion spring 401 is fixedly installed on the drive sleeve 4, the other end of the torsion spring 401 is fixedly connected to the transmission shaft 3, and a connecting rod 402 is fixedly installed between the fan blade 301 and the drive sleeve 4. When the transmission shaft 3 rotates, it will drive the torsion spring 401 fixedly connected thereto to rotate. At this time, the drive sleeve 4 and the fan blade 301 will maintain their original static state under the action of inertia, which causes the torsion spring 401 to twist. When the torsion spring 401 twists to the limit position, it will drive the drive sleeve 4 to rotate through the torsion spring 401, and drive the fan blade 301 to rotate through the transmission of the connecting rod 402, so that the air flow rate can be increased through the fan blade 301, and then the heat dissipation of the motor can be accelerated. There is a heat dissipation air duct inside the motor (this is prior art and will not be elaborated here).

[0029] When the motor stops rotating, that is, when the transmission shaft 3 does not rotate, at this time, the torsion spring 401 will reset under the action of its own elastic force. At this time, the torsion spring 401 can drive the driving sleeve 4 to rotate in the reverse direction, and drive the fan blade 301 to rotate in the reverse direction through the connecting rod 402. At this time, the flow direction of the gas in the motor will be changed for a short time.

[0030] Further, a scraper 5 is slidably mounted on the transmission shaft 3. A slide bar 503 is fixedly mounted on the scraper 5. A chute is provided on the transmission shaft 3, and the slide bar 503 is slidably connected to the chute. The connection between the slide bar 503 and the chute enables the scraper 5 to move within a certain range along the axis direction of the transmission shaft 3. A dust-proof assembly is mounted on the main body 1. The dust-proof assembly includes a protective cover 2 fixedly mounted inside the main body 1. A plurality of air holes 201 are formed on the protective cover 2. A dust-proof net 202 is fixedly mounted inside the protective cover 2. The gas will enter the interior of the motor through the air holes 201, and when passing through the dust-proof net 202, the dust inside the gas is blocked by the dust-proof net 202. The scraper 5 cleans the dust-proof assembly. By rotating the scraper 5 on the dust-proof net 202, the dust adhered to the dust-proof net 202 can be made to fall off.

[0031] As Figures 4 - 5 shown, this embodiment further includes a contraction assembly. The contraction assembly is connected to the energy storage assembly. The contraction assembly drives the scraper 5 to disengage from the dust-proof assembly when the transmission shaft 3 rotates, and drives the scraper 5 to contact the dust-proof assembly when the energy storage assembly drives the fan blade 301 to rotate. When the motor rotates, when the scraper 5 contacts the dust-proof net 202, the dust scraped off by the scraper 5 will enter the interior of the motor along with the airflow. Therefore, at this time, the scraper 5 should not be in contact with the dust-proof net 202. When the energy storage assembly drives the fan blade 301 to rotate in the reverse direction, the scraper 5 is made to contact the dust-proof net 202, and the dust can be discharged to the outside of the motor under the action of the airflow. The contraction assembly includes a plurality of telescopic rods 501 rotatably mounted on the driving sleeve 4. The other end of the telescopic rod 501 is rotatably connected to the scraper 5. A counterweight 502 is fixedly mounted on the telescopic rod 501. An elastic member is mounted between the scraper 5 and the transmission shaft 3. A spring 504 is rotatably mounted on the transmission shaft 3. The other end of the spring 504 is rotatably connected to the scraper 5. When the driving sleeve 4 rotates, it will drive the telescopic rod 501 to rotate. The rotating telescopic rod 501 will be affected by the centrifugal force and gradually rotate towards the direction approaching the vertical state, and the centrifugal force can be enhanced under the action of the counterweight 502, so as to drive the scraper 5 to disengage from the dust-proof net 202 and compress the spring 504. When the driving sleeve 4 rotates in the reverse direction, the rotation speed at this time is relatively small. At this time, the centrifugal force received by the telescopic rod 501 cannot overcome the elastic force of the spring 504. At this time, the spring 504 will drive the scraper 5 to abut against the dust-proof net 202, so that the dust-proof net 202 can be cleaned by the scraper 5.

[0032] Furthermore, rollers 6 are rotatably installed at both ends of the scraper 5, and bumps 601 are provided on the rollers 6. When the scraper 5 abuts against the dust-proof net 202 and rotates, it will drive the rollers 6 to roll on the protective cover 2. The bumps 601 provided can cause the scraper 5 to vibrate when the rollers 6 rotate, thereby enhancing the cleaning effect on the dust-proof net 202.

[0033] The working principle of this embodiment is as follows: When the transmission shaft 3 rotates, it will drive the torsion spring 401 fixedly connected thereto to rotate. At this time, the drive sleeve 4 and the fan blade 301 will remain in their original static state under the action of inertia, which causes the torsion spring 401 to twist. When the torsion spring 401 twists to the limit position, it will drive the drive sleeve 4 to rotate through the torsion spring 401, and drive the fan blade 301 to rotate through the transmission of the connecting rod 402. At this time, the telescopic rod 501 will be driven to rotate at the same time. The rotating telescopic rod 501 will be affected by the centrifugal force and gradually rotate in the direction approaching the vertical state, and the counterweight 502 can enhance this centrifugal force, thereby driving the scraper 5 to disengage from the dust-proof net 202.

[0034] When the motor stops rotating, that is, when the transmission shaft 3 does not rotate, at this time, the torsion spring 401 will reset under the action of its own elastic force. At this time, the torsion spring 401 can drive the drive sleeve 4 to rotate in the reverse direction, and drive the fan blade 301 to rotate in the reverse direction through the connecting rod 402. At this time, the flow direction of the gas in the motor will be changed for a short time. At this time, the centrifugal force received by the telescopic rod 501 cannot overcome the elastic force of the spring 504. At this time, the spring 504 will drive the scraper 5 to abut against the dust-proof net 202, thereby enabling the scraper 5 to clean the dust-proof net 202. And under the action of the air flow, the dust can be discharged to the outside of the motor.

[0035] The above specific embodiments are only several alternative embodiments of the present invention. Based on the technical solution of the present invention and the relevant revelations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A brushless motor with good heat dissipation effect, comprising a main body (1), a rotor is installed in the main body (1), and an output shaft (101) is fixedly installed on the rotor, characterized in that, It further includes: A transmission shaft (3) fixedly installed on the rotor, and a fan blade (301) is rotatably installed on the transmission shaft (3); An energy storage component, which stores a part of the kinetic energy of the transmission shaft (3) and drives the fan blade (301) to rotate when the transmission shaft (3) rotates, and releases kinetic energy to drive the fan blade (301) to rotate in the reverse direction when the transmission shaft (3) stops rotating; A scraper (5) slidably installed on the transmission shaft (3), a dust-proof component is installed on the main body (1), and the scraper (5) cleans the dust-proof component; A contraction component, which is connected to the energy storage component. The contraction component drives the scraper (5) to disengage from the dust-proof component when the transmission shaft (3) rotates, and drives the scraper (5) to contact the dust-proof component when the energy storage component drives the fan blade (301) to rotate; The energy storage component includes a driving sleeve (4) rotatably installed on the transmission shaft (3), a torsion spring (401) is fixedly installed on the driving sleeve (4), the other end of the torsion spring (401) is fixedly connected to the transmission shaft (3), and a connecting rod (402) is fixedly installed between the fan blade (301) and the driving sleeve (4); The dust-proof component includes a protective cover (2) fixedly installed in the main body (1), a plurality of air holes (201) are opened on the protective cover (2), and a dust-proof net (202) is fixedly installed in the protective cover (2); The contraction component includes a plurality of telescopic rods (501) rotatably installed on the driving sleeve (4), the other end of the telescopic rod (501) is rotatably connected to the scraper (5), a counterweight block (502) is fixedly installed on the telescopic rod (501), and an elastic member is installed between the scraper (5) and the transmission shaft (3).

2. The brushless motor with good heat dissipation effect according to claim 1, characterized in that, A slide rod (503) is fixedly installed on the scraper (5), a chute is provided on the transmission shaft (3), and the slide rod (503) is slidably connected to the chute.

3. The brushless motor with good heat dissipation effect according to claim 2, characterized in that, A spring (504) is rotatably installed on the transmission shaft (3), and the other end of the spring (504) is rotatably connected to the scraper (5).

4. A brushless motor with good heat dissipation effect according to claim 3, characterized in that, Rollers (6) are rotatably installed at both ends of the scraper (5), and bumps (601) are provided on the rollers (6).

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