HIGH SPEED BLOWER EXHAUST BRUSHLESS MOTOR

A blower exhaust brushless motor includes: a casing including an outer shell and a fix cylinder, two ends of the outer shell are respectively provided with an air inlet and a ventilation outlet; a stator component including a stator rear bracket coaxial arranged with the fix cylinder, a stator coil provided in the stator rear bracket, and a stator rear bearing seat integrated with the stator rear bracket; a rotor component including a rotor shaft, a permanent magnet sleeved in a middle of the rotor shaft, a first bearing and a second bearing that are arranged at two ends of the rotor shaft; an impeller, an end of the rotor shaft passes through the first bearing and is fixedly connected to the impeller to drive the impeller to rotate; a circuit board electrically connected to the stator coil; and a protective sleeve.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 20231150637.7, filed on Aug. 18, 2023, which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of various hair dryer exhaust systems with a motor technologies, and in particular, to a high speed blower exhaust brushless motor.

BACKGROUND

Brushless motor is a type of motor without brushes and commutators (or collector rings), which operates by changing the frequency and waveform of alternating current waves passing through its armature winding coils. Brushless motors are widely used by major manufacturers due to advantages such as high efficiency, low energy consumption, low noise, ultra long lifespan, high reliability, servo control, stepless frequency conversion speed regulation, relatively low cost, and simplicity.

In related technologies, brushless motors mainly include a stator coil component, a rotor component, and an integrally formed motor shell. An interior of the motor shell is provided with a hollow inner cavity, the stator coil component is coaxial with the motor shell and runs through the hollow inner cavity. The rotor component is provided in the stator coil component, two ends of the motor shell are provided with an integrally formed bearing support bracket, two sides of the bearing support bracket at a rear end of the motor shell are provided with a heat dissipation window, and two ends of the rotor component are fixed to the bearing support bracket at two ends of the motor shell through a bearing.

Due to a use of a brushless motor in related technologies, a circuit board is needed to be installed on the bearing support bracket at a rear end of the motor shell to connect the pin so as to achieve an electrical connection between the stator coil component and the circuit board. Due to an obstruction of the circuit board, air discharged from an interior of the motor shell will blow towards the circuit board, thereby forming return air and noise, which affects an air output of the motor. At the same time, due to the bearing support bracket and the motor shell being integrally formed, an assembly process of the stator coil component, the rotor component, and the shell during motor assembly is relatively cumbersome, resulting in low assembly efficiency.

SUMMARY

A purpose of the present disclosure is to address a phenomenon that wind in a motor shell of a brushless motor in the prior art blows towards s circuit board during use, which forms return air and noise, affects an output air volume of the motor. In addition, a bearing support bracket and the motor shell are integrally formed, resulting in a cumbersome assembly process and low assembly efficiency between a stator coil component and a rotor component with the motor shell during motor assembly. The present disclosure provides a high speed blower exhaust brushless motor.

The technical solution adopted by the present disclosure is: a modular design of a high-speed brushless motor, which includes: a casing, the casing includes an outer shell and a fix cylinder that are coaxially arranged, two ends of the outer shell are respectively provided with an air inlet and a ventilation outlet, a ventilation chamber is formed between the outer shell and the fix cylinder; a stator component provided in the casing, the stator component includes a stator rear bracket coaxially arranged with the fix cylinder, a stator coil provided in the stator rear bracket, and a stator rear bearing seat integrated with the stator rear bracket; one end of the stator rear bracket is located in the fix cylinder, the other end of the stator rear bracket extends out of the fix cylinder, the stator rear bearing seat is located at one end of the stator rear bracket protruding from the fix cylinder, two sides of one end of the stator rear bracket close to the stator rear bearing seat are respectively provide with a heat dissipation port; a rotor component provided in the stator coil, the rotor component includes a rotor shaft, a permanent magnet provided in a middle of the rotor shaft, and a first bearing and a second bearing that are respectively provided at two ends of the rotor shaft, where the rotor shaft is coaxially arranged with the stator rear bracket, one end of the rotor shaft is fixedly connected to one end of the fix cylinder close to the air inlet through the first bearing, the other end of the rotor shaft is fixedly connected to the stator rear bearing seat through the second bearing; an impeller rotatably provided at one end of the fix cylinder facing the air inlet, one end of the rotor shaft passes through the first bearing and is fixedly connected to the impeller to drive the impeller to rotate; a circuit board provided on the stator rear bearing seat and electrically connected to the stator coil for supplying power to the stator coil and causing the stator coil to generate a magnetic field; and a protective sleeve provided on the stator rear bracket for sealing the heat dissipation port.

In an embodiment of the present disclosure, an inner of the outer shell is evenly provided with multiple connection plates, the multiple connection plates are arranged along a length direction of the casing, and the multiple connection plates are evenly distributed along a circumferential direction of the outer shell; two sides of each connection plate are respectively fixedly connected to an inner wall of the casing and an outer side of the fix cylinder so as to achieve a connection and fixation between the fix cylinder and the casing, the ventilation chamber is divided into multiple ventilation grooves under an action of the multiple connection plates.

In an embodiment of the present disclosure, an outer side wall of the stator rear bracket is tightly connected to an inner wall of the fix cylinder so that heat generated by the stator coil can be quickly transferred to the fix cylinder and then dispersed by wind in the ventilation groove.

In an embodiment of the present disclosure, one end of the fix cylinder facing the air inlet is evenly provided with several air intakes, the serval air intakes are evenly provided along a circumferential direction of the fix cylinder, the several air intakes are all connected to an interior of the fix cylinder, the several air intakes are all located at an edge of the fix cylinder allowing wind generated by an rotation of the impeller to blow into the interior of the fix cylinder.

In an embodiment of the present disclosure, one side of the stator coil facing the circuit board is provided with multiple pins, the multiple pins are arranged along a length direction of the stator coil; the circuit board is provided with several through holes, the serval through holes correspond one-to-one with the pins, the pins are welded and fixed to the circuit board after passing through the through holes so as to achieve an electrical connection between the stator coil and the circuit board.

In an embodiment of the present disclosure, the circuit board is provided with multiple heat dissipation slots, the multiple heat dissipation slots all run through the circuit board, the multiple heat dissipation slots are located at an edge of the circuit board, and the multiple heat dissipation slots are evenly distributed along a circumferential direction of the circuit board.

In an embodiment of the present disclosure, the rotor component further includes a limit ring provided on the rotor shaft and a spring provided between the limit ring and the second bearing; the limit ring is fixedly sleeved at one end of the rotor shaft close to the second bearing, the spring is wound outside the rotor shaft, two ends of the spring are respectively fixedly connected to one side between the limit ring and the second bearing that are faced to each other.

In an embodiment of the present disclosure, the fix cylinder and the stator rear bearing seat are respectively provided with a first bearing groove and a second bearing groove, the first bearing groove and the second bearing groove are oppositely arranged, and the first bearing groove and the second bearing groove are configured to install and fix the first bearing and the second bearing, respectively.

After adopting the above technical solution, the beneficial effects of the present disclosure are:1. When in use, the present application provides power to the stator coil through the circuit board, which generates a magnetic field after the stator coil is energized, which causes the rotor component to rotate at high speed in the stator coil, the impeller is driven to rotate, and air is blown towards the fix cylinder in the casing, that is, air is sucked from an inlet of the casing and air is outputted from an outlet of the casing, thereby achieving an output of air volume, and also dissipating heat in the casing. The heat dissipation port is enclosed by a protective sleeve, so that the air blown out of the air outlet is discharged along an outer wall of the protective sleeve, avoiding a formation of return air due to the wind blown out by the impeller passing through the heat dissipation port on the circuit board, reducing a generation of noise and ensuring the air output. At the same time, the present application modularizes a production of the stator component, the rotor component, and the casing. During assembly, the stator component, the rotor component, and the casing are assembled separately, and then the stator component, the rotor component, and the casing are integrated assembled, which optimizes a production process, improves assembly efficiency, and facilitates the production and promotion of motors.2. The present application allows the wind generated by the impeller to be blown into the stator rear bracket the through an arrangement of an inlet hole and a heat dissipation groove, thereby blowing the heat generated by the stator coil into the heat dissipation groove for discharge. At the same time, through a tight connection between the stator rear bracket and the fix cylinder, the heat generated by the stator coil can be quickly transferred to an installation cylinder and dissipated by the wind blown into the ventilation chamber by the impeller so as to achieve a stable heat dissipation of the stator coil, with better heat dissipation effect.

DESCRIPTION OF EMBODIMENTS

Further detailed explanation of the present disclosure will be provided below in combination withFIGS.1-7.

This specific embodiment is only an explanation of the present disclosure and is not a limitation of the present disclosure. After reading this specification, those skilled in the art may make modifications to this embodiment as needed without making any creative work, but as long as they fall within the scope of the claims of the present disclosure.

This embodiment relates to a high speed blower exhaust brushless motor, referring toFIGS.1and3, and combined withFIG.2, which includes a casing1, a stator component2, a rotor component3, a circuit board4, and an impeller5. The stator component2is provided in the casing1, the rotor component3is provided in the stator component2, the circuit board4is electrically connected to the stator component2, the impeller5is rotatably provided in the casing1, one end of the rotor component3passes through the stator component2and is fixedly connected to the impeller5. The main working process is to supply power to the stator component2through the circuit board4, the stator component2is caused to generate a magnetic field, thereby causing the rotor component3to rotate at high speed in the stator component2, while the impeller5is driven to rotate, allowing the impeller5to blow air into an interior of the casing1.

Referring toFIGS.3and4, the casing1includes an outer shell11and a fix cylinder12that are coaxially arranged, where the outer shell11is arranged in a cylindrical shape with an opening at two ends, one end of the outer shell11is an air inlet13, and the other end of the outer shell11is a ventilation outlet14. The fix cylinder12is arranged in a cylindrical shape with one end closed, and a closed end of the fix cylinder12is facing the air inlet13, an open end of the fix cylinder12is facing the ventilation outlet14, and the closed end of the fix cylinder12is located in the outer shell11. The open end of the fix cylinder12is flush with the ventilation outlet14of the outer shell11, and a ventilation chamber is formed between the outer shell11and the fix cylinder12.

An inner wall of outer shell11is evenly provided with multiple connection plates15, the multiple connection plates15are all arranged along a length direction of the outer shell11. The multiple connection plates15are evenly distributed along a circumferential direction of the outer shell11, an upper side and a lower side of the multiple connection plates15are fixedly connected to the inner wall of the outer shell11and an outer side of the fix cylinder12to achieve a connection and fixation between the fix cylinder12and outer shell11. The ventilation chamber is divided into multiple ventilation grooves16under an action of the multiple connection plates15. It should be noted that in an actual production process, the outer shell11, the fix cylinder12, and the connection plate15can be integrated by injection molding.

Referring toFIGS.3and5, the stator component2is provided in the fix cylinder12, the stator component2includes a stator rear bracket21coaxially arranged with the fix cylinder12, a stator coil22arranged in the stator rear bracket21, and a stator rear bearing seat23integrated with the stator rear bracket21. Where, one end of the stator rear bracket21is located in the fix cylinder12, the other end of the stator rear bracket21extends outside the fix cylinder12, and the stator rear bearing seat23is located at one end of the stator rear bracket21that extends outside the fix cylinder12. In order to facilitate internal heat dissipation of the stator rear bracket21, heat dissipation ports24are provided on both sides of one end of the stator rear bracket21close to the stator rear bearing seat23.

In an implementation mode, an outer side wall of the stator rear bracket21is tightly connected to an inner wall of the fix cylinder12, allowing heat generated by the stator coil22to be quickly transferred to the fix cylinder12and then blown away by wind of the impeller5blowing towards the ventilation chamber, thereby improving a heat dissipation effect of the motor.

In an implementation mode, one end of the fix cylinder12facing the ventilation outlet14(i.e. the closed end of the fix cylinder12) is provided with several inlet intakes121, the several inlet intakes121are evenly distributed along a circumferential direction of the fix cylinder12. The several inlet intakes121are all connected to an interior of the fix cylinder12, and the serval inlet intakes121are located at an edge of the fix cylinder12, the wind generated by a rotation of the impeller5can be blown into the interior of the fix cylinder12. By providing with the inlet intakes121, the wind generated by the rotation of the impeller5can be blown into the interior of the fix cylinder12, so that the heat generated by the stator coil22can be blown to the heat dissipation port24in the fix cylinder12, thereby improving the heat dissipation effect of the stator coil22.

Referring toFIGS.3and6, the rotor component3is provided in the stator coil22, the rotor component3includes a rotor shaft31, a permanent magnet32provided in a middle of an outer of the rotor shaft31, and a first bearing33and a second bearing34that are provided at both ends of the rotor shaft31. The rotor shaft31is coaxial with the stator installation shaft, one end of the rotor shaft31is fixedly connected to the fix cylinder12close to the air inlet13through the first bearing33, the other end of the rotor shaft31is fixedly connected to the stator rear bearing seat23the through the second bearing34.

The rotor component3further includes a limit ring35provided on the rotor shaft31and a spring36provided between the limit ring35and the second bearing34. The limit ring35is fixedly sleeved at one end of the rotor shaft31close to the second bearing34, the spring36is wound outside the rotor shaft31. Two ends of the spring36are respectively fixedly connected to one end between the limit ring35and the second bearing34that are faced to each other.

In an implementation mode, referring toFIGS.4and5, in order to achieve a stable assembly of the rotor component3and enable the rotor shaft31to rotate stably in the stator coil22, a first bearing groove122and a second bearing groove231are respectively provided on the fix cylinder12and the stator rear bearing seat23. The first bearing groove122and the second bearing groove231are oppositely arranged, and the first bearing groove122and the second bearing groove231are respectively configured to install and fix the first bearing33and the second bearing34.

Referring toFIGS.5and7, the circuit board4is fixedly installed on one side of the stator rear bearing seat23away from the stator rear bracket12. Multiple pins221are provided at one side of the stator coil22facing the circuit board4. The multiple pins221are provided along a length direction of the stator coil22. Several through holes41are provided on the circuit board4, the several through holes41correspond one-to-one with pins221. After passing through the through holes41, pins221are welded and fixed on the circuit board4, thereby achieving an electrical connection between the stator coil22and the circuit board4.

The impeller5is located at the air inlet13of the outer shell11. The impeller5is rotatably provided at the closed end of the fix cylinder12. One end of the rotor shaft31passes through the first bearing33and extends out of the closed end of the fix cylinder12, and is fixedly connected to the impeller5.

Based onFIG.1, in addition, to prevent the air generated by the rotation of the impeller5from blowing from the heat dissipation port24to the circuit board4to form a return air, a protective sleeve6is provided on the stator rear bracket21to close the heat dissipation port24. The protective sleeve6is sleeved on the stator rear bracket21, an outer surface of the protective sleeve6is flush with the fix cylinder12and abuts against the fix cylinder12. An inner wall of one end of the protective sleeve6far away the fix cylinder12is abutted against an outer edge of the circuit board4.

Referring toFIGS.3and7, further, multiple heat dissipation slots42are provided on the circuit board4, the multiple heat dissipation slots42all run through the circuit board4. The multiple heat dissipation slots42are located at an edge of the circuit board4, and are evenly distributed along a circumferential direction of the circuit board4. By providing with the heat dissipation slot42, the wind blown into the fix cylinder12by the impeller5blows the heat generated by the stator coil22to the heat dissipation slot42for discharge, thereby avoiding a situation where the heat generated by the stator coil22accumulates in the fix cylinder12due to a sealing of the heat dissipation port24by the protective sleeve6, and improving the heat dissipation effect.

The working principle of the present disclosure is roughly as follows: during assembly, the stator component2and the rotor component3are first assembled separately to form modular production, and then the stator component2and the rotor component3are sequentially installed into the casing1to achieve modular assembly of the motor and improve the assembly efficiency of the motor. When in use, power is supplied to the stator coil22through the circuit board4, the stator coil22is caused to generate a magnetic field, and the rotor shaft31is driven to rotate stably and at high speed in the stator coil22, while the impeller5is also driven to rotate, that is, the impeller5stably exports air to the outside. A portion of air generated by the impeller5is blown into the fix cylinder12through the air inlet hole. The air entering the fix cylinder12blows the heat generated by the stator coil22to the heat dissipation slot42for discharge, achieving heat dissipation of the stator coil22. Another portion of air generated by the impeller5is blown into a ventilation chamber. At this time, the heat generated by the stator coil22is transferred to the outer wall of the fix cylinder12and is blown by the air in the ventilation chamber to the ventilation outlet14for discharge, further heat dissipation of the stator coil22is achieved, ensuring the heat dissipation effect of the motor. At the same time, the heat dissipation port24is closed by the protective sleeve so that the air generated by the impeller5cannot be blown from the heat dissipation port24to the circuit board4to generate return air, achieving an effect of noise reduction and ensuring the output air volume of the motor.

The above is only used to illustrate the technical solution of the present disclosure and not to limit it. Any other modifications or equivalent substitutions made by ordinary technicians in the art to the technical solution of the present disclosure, as long as they do not deviate from the spirit and scope of the technical solution of the present disclosure, should be included in the scope of the claims of the present disclosure.