Brushless electric motor cooling device

Abstract

The present invention relates to the technical field of brushless electric motor cooling, and specifically relates to a brushless electric motor cooling device, comprising an electric motor body, a transmission shaft, a liquid storage tank and a top cover, and further comprising a cooling assembly, wherein the transmission shaft is fixedly mounted in the electric motor body; the cooling assembly is fixedly mounted on the electric motor body; the liquid storage tank is fixedly mounted at one end of the cooling assembly; and the top cover is fixedly mounted at the other end of the cooling assembly. The present invention solves the problem of existing brushless electric motors being easily damaged during a high-load and high-speed rotation process caused by simple air cooling or water cooling being unable to provide a satisfactory cooling effect for excessive heat generated by the brushless electric motors when rotating at high speed for a long time. The present invention enables a brushless electric motor to be cooled rapidly, significantly improving the cooling effect for the brushless electric motor and prolonging the service life thereof.

Description

Brushless motor cooling device Technical Field

[0001] The present invention relates to the technical field of brushless motor cooling, and in particular to a brushless motor cooling device. Background Art

[0002] A brushless motor consists of a rotor, stator, and position sensor. The position sensor monitors the position of the rotor's magnetic poles relative to the stator windings based on changes in the rotor's position. After signal processing by a signal conversion circuit, the position sensor controls the power switching circuit, switching the winding current according to a specific logic relationship, thereby enabling high-speed motor rotation.

[0003] Brushless motors often have the advantages of low interference, low noise, smooth operation and long life. Therefore, brushless motors are used in various fields and have been widely used in industrial production, improving production efficiency.

[0004] When working, the existing brushless motor needs to rotate at high speed for a long time, which will cause the stator inside the brushless motor to generate a lot of heat due to the long-term flow of current. After a long period of rotation, the heat cannot be exchanged with the outside world well, which will cause damage to the brushless motor. The existing method is to install fan blades at the tail end of the brushless motor, and the rotation of the fan blades accelerates the air flow rate inside the brushless motor to dissipate heat for the brushless motor, or to dissipate heat and cool the brushless motor through simple water cooling. However, simple air cooling or water cooling cannot exchange the heat inside the brushless motor with the outside world. The cooling and heat dissipation effect of the brushless motor is poor, and a good cooling effect cannot be achieved after working for a long time. Under high load and high-speed rotation, the brushless motor is easily damaged.

[0005] In view of this, and in response to the above-mentioned shortcomings, the present invention has developed a brushless motor cooling device. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the existing brushless motor will generate a large amount of heat during long-term high-speed rotation. Simple air cooling or water cooling cannot achieve a good cooling effect. Under high load and high-speed rotation, the brushless motor is easily damaged.

[0007] The present invention provides the following technical solution: a brushless motor cooling device, comprising a motor body, a transmission shaft, a liquid storage tank and a top cover; further comprising a cooling assembly, wherein a transmission shaft is fixedly installed inside the motor body, and the cooling assembly is fixedly installed on the motor body. The cooling assembly drives the cooling assembly to rotate through the rotation of the motor body, and the centrifugal force generated by the rotation throws the coolant to the surroundings to form a water ring. The coolant flows out to cool the motor, and then the outside air is drawn in through the negative pressure in the water ring and discharged to dissipate heat for the cooling assembly; the liquid storage tank is fixedly installed at one end of the cooling assembly, and the top cover is fixedly installed at the other end of the cooling assembly, and can be connected by bolting or welding.

[0008] When the brushless motor is working, a large amount of heat is generated during the rotation process, so the brushless motor needs to be cooled to avoid damage to the brushless motor. The brushless motor needs to rotate and drive the cooling component to start, so that the coolant inside the liquid storage tank flows into the cooling component. The coolant quickly cools the brushless motor through the cooling component, and the outside air is drawn in through the cooling component, and then the air is discharged and the flow rate of the air is accelerated. Finally, the coolant quickly exchanges heat with the outside, thereby achieving the effect of circulating cooling of the brushless motor, greatly improving the service life of the brushless motor.

[0009] The cooling assembly includes a spiral pipe, a cylinder, an impeller, a cover, a bottom cover, an air cover and a flow module; the outer surface of the motor body is provided with a spiral pipe for heat exchange with the heat inside the motor, the cylinder is fixedly mounted on the outer surface of the spiral pipe, the bottom of the cylinder is fixedly mounted with a cover, the impeller is fixedly mounted on the drive shaft and can be connected by bolts or welding, the bottom cover is fixedly mounted on the outside of the cover, the flow module is fixedly mounted on the outside of the cylinder, and the air cover is fixedly mounted on the bottom of the cover and can be connected by bolts or welding.

[0010] In order to achieve rapid cooling of the brushless motor and ensure its stable operation during operation, the brushless motor needs to be cooled through the spiral pipe on the cooling component. The coolant passes through the spiral pipe and takes away the heat generated by the brushless motor. Finally, the coolant flows back to the liquid storage tank through the flow module to achieve circulating cooling of the brushless motor, thereby improving the cooling effect of the brushless motor. When the drive shaft drives the impeller to rotate, the coolant inside the bottom cover can form a water ring through centrifugal force, and the coolant is thrown into the spiral pipe. A negative pressure will be formed inside the water ring, and the outside air will be drawn in and finally discharged to accelerate the heat exchange effect between the coolant and the outside world.

[0011] The flow module includes a guide block, an annular shell, a heat sink and a circular ring; the annular array of the guide blocks is fixedly mounted on the outer surface of the cylinder, and the annular shell is fixedly mounted on one end of the guide block. The guide block guides the coolant and exchanges the heat of the motor with the outside world, thereby accelerating the cooling speed of the cooling component. The guide block can be connected by bolting or welding. A circular hole is opened on the side of the annular shell, and the circular hole is interconnected with the spiral pipe. A heat sink is fixedly mounted on the top of the guide block, and a circular ring is fixedly mounted on the other end of the guide block. The guide block can be connected by bolting or welding.

[0012] The guide block is a rectangular structure, and a rectangular through hole is provided at one end of the rectangular structure. A plurality of rectangular grooves are provided in a ring array with the axis as the center on the inner side of the ring shell, and the rectangular grooves and the rectangular through holes cooperate with each other to accelerate the heat exchange between the coolant and the outside world, thereby causing the coolant to circulate inside the cooling component. A plurality of strip grooves are provided in an array with the axis as the center on the inner side of the circular ring, and the strip grooves are connected to the rectangular through holes. A long strip through hole is provided on the outer side of the circular ring, and the long strip through holes and the rectangular through holes are staggered with each other. The long strip through holes accelerate the heat dissipation speed of the coolant on the cooling component by increasing the contact area between the guide block and the air.

[0013] In order to ensure that the coolant can circulate and quickly cool the brushless motor, the coolant must be diverted to the outside of the cylinder through a guide block. The heat of the coolant will be transferred to the heat sink. Finally, the exhaust air will accelerate the flow rate of air between the heat sinks, thereby accelerating the heat exchange efficiency between the coolant and the outside world, so as to realize the circulation of the coolant, thereby accelerating the efficiency of heat exchange and improving the cooling effect of the brushless motor.

[0014] A plurality of reflux holes are provided on the arc surface around the circular ring, and the reflux holes are communicated with the strip grooves. A U-shaped tube is fixedly installed on the reflux hole, and the other end of the U-shaped tube is fixedly installed on the outer surface of the liquid storage tank. The U-shaped tube is used to transport the coolant back to the liquid storage tank and circulate cooling and heat dissipation to provide circulating coolant for the cooling component. It can be connected by bolt connection or welding. The cooled coolant finally flows back to the inside of the liquid storage tank through the U-shaped tube. At the same time, multiple U-shaped tubes can speed up the flow of the coolant, so that the coolant flows quickly into the liquid storage tank, and finally the brushless motor is cooled by the drive of the impeller.

[0015] The bottom cover is a circular structure, and a circular protrusion is provided inside the bottom cover. The circular protrusion isolates the water ring and the air chamber, and discharges the gas to dissipate heat to the coolant on the cooling component. A water inlet hole is provided at the bottom of the bottom cover, and the water inlet hole is used to guide the coolant to the interior and form a water ring to drive the coolant to flow in the cooling component. A water outlet hole is provided on the side of the circular protrusion on the bottom cover, and the water outlet hole is located on the opposite side of the water inlet hole. The diameter of the water outlet hole is equal to the diameter of the water inlet hole.

[0016] In order to ensure that the coolant can circulate during the rotation of the impeller, the coolant needs to flow from the liquid storage tank into the inside of the bottom cover through the water inlet hole at the bottom of the bottom cover. The impeller inside the bottom cover rotates, and the coolant is thrown into the spiral pipe by centrifugal force, and the brushless motor is quickly cooled down. The outside air is drawn into the inside of the bottom cover, and finally discharged into the outside of the circular protrusion inside the bottom cover and discharged through the air cap. The diameter of the water outlet hole is equal to the diameter of the water inlet hole, in order to ensure that the coolant inlet flow rate and the water outlet flow rate are the same, thereby improving the cooling effect of the coolant on the brushless motor.

[0017] The air cover is a circular structure, and an air inlet and an air outlet are respectively opened on both sides of the outside of the air cover at any diameter. The air cover isolates the coolant from the gas, draws the gas in through the negative pressure formed by the water ring, and collects the air to dissipate heat for the cooling component.

[0018] In order to ensure that the impeller can quickly extract the outside air during its rotation, it is necessary to use negative pressure to allow the air to enter the air inlet, flow into the bottom cover through the air inlet, and finally flow out through the exhaust hole, and accelerate the flow rate of air between the guide block and the heat sink, so that the coolant inside the guide block can quickly cool and circulate.

[0019] An air intake pipe is fixedly installed on the inner side of the air cover, and one end of the air intake pipe passes through the air cover and is fixedly installed on the air intake hole on the inner side of the air cover, and the other end of the air intake pipe radially passes through the side of the base and the side of the liquid storage tank respectively, and can be connected by bolt connection or welding. The air intake pipe draws and compresses the outside air through negative pressure, and accelerates the air flow rate, thereby accelerating the cooling speed of the cooling component. A plurality of openings are provided in a circular array on the outer surface of the liquid storage tank.

[0020] In order to ensure that the outside air can be drawn into the bottom cover, it is necessary to quickly draw the outside air into the bottom cover through the air intake pipe on the air cover.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The present invention fixes a cooling assembly on the brushless motor. Through the mutual cooperation between the cooling assembly and the brushless motor, the coolant at the bottom of the brushless motor forms a water ring inside the cooling assembly, and the coolant circulates through centrifugal force to cool the brushless motor. When the brushless motor rotates at high speed for a long time, the brushless motor can be cooled in real time, thereby greatly improving the cooling effect of the brushless motor and increasing the service life of the brushless motor.

[0023] 2. The present invention cooperates with the brushless motor and the cooling component so that when the cooling component starts to cool the brushless motor, the negative pressure generated by the water ring formed by internal rotation draws in the outside air, and then compresses and discharges the air, thereby accelerating the air flow rate outside the cooling component, thereby accelerating the efficiency of heat exchange, improving the cooling effect of the brushless motor, and allowing the coolant inside the cooling component to circulate and cool the brushless motor.

[0024] 3. The present invention arranges multiple heat sinks on the cooling assembly, exchanges heat in the coolant through the heat sinks, and then accelerates the air flow rate between the heat sinks to quickly exchange heat inside the coolant with the outside world, so that the coolant can be quickly cooled and flows back to the brushless motor to cool the brushless motor, thereby greatly improving the cooling effect and efficiency of the brushless motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] FIG1 is a schematic diagram of the three-dimensional structure of the present invention;

[0027] FIG2 is an overall exploded view of the present invention;

[0028] FIG3 is a schematic diagram of the three-dimensional structure of the internal structure of the present invention;

[0029] FIG4 is a schematic diagram of the three-dimensional structure of the flow module of the present invention;

[0030] FIG5 is a schematic diagram of the three-dimensional structure of the flow module of the present invention from another perspective;

[0031] FIG6 is a schematic diagram of the three-dimensional structure of the heat sink of the flow module of the present invention;

[0032] FIG7 is a schematic diagram of the three-dimensional structure of the internal structure of the flow module of the present invention;

[0033] FIG8 is a schematic diagram of the three-dimensional structure of the ring shell of the present invention;

[0034] FIG9 is a cross-sectional view of the guide block and heat sink of the present invention;

[0035] FIG10 is a schematic diagram of the three-dimensional structure of the bottom cover of the present invention;

[0036] FIG11 is a schematic diagram of the three-dimensional structure of the air cover of the present invention;

[0037] FIG12 is a schematic diagram of the three-dimensional structure of the liquid storage tank of the present invention.

[0038] In the figure: 1. Motor body; 2. Drive shaft; 3. Liquid storage tank; 31. Opening; 4. Top cover; 5. Cooling assembly; 51. Spiral pipe; 52. Cylinder; 53. Impeller; 54. Cover; 55. Bottom cover; 551. Circular protrusion; 552. Water inlet hole; 553. Water outlet hole; 56. Air cover; 561. Air inlet hole; 562. Air outlet hole; 563. Air inlet pipe; 57. Flow module; 571. Guide block; 572. Ring shell; 573. Heat sink; 574. Ring; 575. Rectangular through hole; 576. Rectangular groove; 577. Circular hole; 578. Strip groove; 579. Long strip through hole; 58. Return hole; 59. U-shaped tube. DETAILED DESCRIPTION

[0039] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0040] As shown in Figures 1 and 2, the present invention provides the following technical solutions: a brushless motor cooling device, comprising a motor body 1, a transmission shaft 2, a liquid storage tank 3 and a top cover 4; further comprising a cooling assembly 5, wherein the transmission shaft 2 is fixedly installed inside the motor body 1, and the cooling assembly 5 is fixedly installed on the motor body 1. The cooling assembly 5 is driven to rotate by the rotation of the motor body 1, and the coolant is thrown to the surroundings to form a water ring through the centrifugal force generated by the rotation. The coolant flows out to cool the motor, and then the outside air is extracted through the negative pressure in the water ring and discharged to dissipate heat for the cooling assembly 5; the liquid storage tank 3 is fixedly installed at one end of the cooling assembly 5, and the top cover 4 is fixedly installed at the other end of the cooling assembly 5, and is connected by bolts.

[0041] When the brushless motor is working at high speed for a long time, the stator current flowing through the brushless motor will cause a large amount of heat to be generated inside the brushless motor. Since the stator is a coil and is installed on the inner wall of the brushless motor housing, the heat will be transferred from the stator to the housing of the brushless motor, and then the rotation of the brushless motor will drive the cooling component 5 to start. The cooling component 5 will absorb the heat generated by the brushless motor to complete the heat exchange, and the coolant will be transported to the inside of the cooling component 5 through the liquid storage tank 3 to cool the brushless motor. Then the cooling component 5 draws outside air to dissipate the heat of the heated coolant and return it to the liquid storage tank 3, thereby completing the heat dissipation and cooling of the brushless motor and improving the service life of the brushless motor.

[0042] As shown in Figures 2, 3, 4, 5 and 11, the cooling assembly 5 includes a spiral pipe 51, a cylinder 52, an impeller 53, a cover 54, a bottom cover 55, an air cover 56 and a flow module 57; the outer surface of the motor body 1 is provided with a spiral pipe 51 for heat exchange with the internal heat of the motor, the cylinder 52 is fixedly mounted on the outer surface of the spiral pipe 51, and the bottom of the cylinder 52 is fixedly mounted with a cover 54, the impeller 53 is fixedly mounted on the drive shaft 2, the impeller 53 generates centrifugal force through rotation, and forms a water ring inside the coolant, and draws air in and out through negative pressure, and is connected by welding, the bottom cover 55 is fixedly mounted on the outside of the cover 54, the flow module 57 is fixedly mounted on the outside of the cylinder 52, and the air cover 56 is fixedly mounted on the bottom of the cover 54, and is connected by welding.

[0043] As the brushless motor works, the brushless motor will drive the impeller 53 to rotate while rotating. The rotation of the impeller 53 will drive the coolant inside the bottom cover 55 to flow. As the impeller 53 rotates at a high speed, centrifugal force will be generated, causing the coolant to form a complete water ring around the bottom cover 55, and the coolant inside the liquid storage tank 3 will flow into the bottom cover 55 through the rotation of the impeller 53. As the centrifugal force generated by the rotation of the impeller 53, the coolant will also be thrown into the spiral pipe 51 through the sealing cover 54 by centrifugal force, and the brushless motor will be cooled by the spiral pipe 51. As the impeller 53 rotates, a negative pressure will be formed inside the formed water ring, and the outside air will be drawn into the bottom cover 55. As the impeller 53 rotates, the extracted air will be compressed and then discharged. The discharged air dissipates heat for the coolant after heat exchange. By accelerating the air flow rate, the coolant is cooled, the brushless motor is circulated and cooled, and the cooling effect of the brushless motor is improved.

[0044] As shown in Figures 2 to 9, the flow module 57 includes a guide block 571, an annular shell 572, a heat sink 573 and a ring 574; the guide block 571 is fixedly installed in an annular array on the outer surface of the cylinder 52, and the guide block 571 guides the coolant and exchanges the heat of the motor with the outside world, thereby accelerating the cooling speed of the cooling component 5. It is connected by welding, and a circular hole 577 is opened on the side of the annular shell 572. The circular hole 577 is interconnected with the spiral pipe 51. The heat sink 573 is fixedly installed on the top of the guide block 571, and the other end of the guide block 571 is fixedly installed with a ring 574, which is connected by welding.

[0045] The guide block 571 is a rectangular structure, and a rectangular through hole 575 is provided at one end of the rectangular structure. A ring shell 572 is fixedly installed at one end of the guide block 571. A plurality of rectangular grooves 576 are provided on the inner side of the ring shell 572 in a circular array with the axis as the center, and the rectangular grooves 576 cooperate with the rectangular through hole 575 to accelerate the heat exchange between the coolant and the outside world, thereby causing the coolant inside the cooling component 5 to circulate. A plurality of strip grooves 578 are provided on the inner side of the circular ring 574 in an array with the axis as the center, and the strip grooves 578 are interconnected with the rectangular through hole 575. A long strip through hole 579 is provided on the outer side of the circular ring 574, and the long strip through hole 579 and the rectangular through hole 575 are staggered and spaced apart. The long strip through hole 579 accelerates the heat dissipation speed of the coolant on the cooling component 5 by increasing the contact area between the guide block 571 and the air.

[0046] When the brushless motor is working, the rotation of the impeller 53 will form a water ring inside the bottom cover 55, and the coolant will be thrown into the spiral pipe 51 by centrifugal force. After the coolant enters the spiral pipe 51, it will cool the brushless motor. After cooling, the coolant will be integrated into the ring shell 572 and flow into the rectangular through hole 575 on the guide block 571 through the rectangular groove 576 inside the ring shell 572. The heat of the coolant will be transferred from the guide block 571 to the heat sink 573, and as the impeller 53 rotates, the coolant will be cooled. The movement will form a negative pressure inside the water ring, and the outside air will be extracted, and then flow out through the long strip through-holes 579 on the bottom of the ring 574, and the air flow rate between the adjacent guide blocks 571 and the heat sink 573 will be accelerated, thereby dissipating the heat of the guide blocks 571 and the heat sink 573, causing the temperature inside the guide blocks 571 to drop rapidly, and then flow back into the liquid storage tank 3, and circulate cooling for the brushless motor, ensuring that the brushless motor will not be damaged during high-speed rotation, thereby improving the heat dissipation effect of the brushless motor.

[0047] As shown in Figures 2 to 5, a plurality of reflux holes 58 are provided on the arc-shaped surface around the circular ring 574. The reflux holes 58 are communicated with the strip-shaped grooves 578. A U-shaped tube 59 is fixedly installed on the reflux hole 58. The other end of the U-shaped tube 59 is fixedly installed on the outer surface of the liquid storage tank 3. The U-shaped tube 59 is used to transport the coolant back to the liquid storage tank 3 and perform circulating cooling and heat dissipation to provide circulating coolant for the cooling component 5. It is connected by bolts.

[0048] When the cooling assembly 5 cools the brushless motor, the coolant after cooling is completed will flow out from the spiral pipe 51 and flow into the guide block 571 through the annular shell 572, and quickly dissipate heat through the heat sink 573 on the guide block 571. Then the coolant flows out from the rectangular through hole 575 on the guide block 571 and flows into the strip groove 578 on the circular ring 574. Finally, it flows into the U-shaped tube 59 through the reflux hole 58 on the circular ring 574, and flows into the liquid storage tank 3 through the U-shaped tube 59, thereby realizing circulating cooling of the brushless motor.

[0049] As shown in Figures 2 and 10, the bottom cover 55 is a circular structure. A circular protrusion 551 is provided inside the bottom cover 55. The circular protrusion 551 isolates the water ring from the air chamber and discharges the gas to dissipate the heat of the coolant on the cooling component 5. A water inlet hole 552 is provided at the bottom of the bottom cover 55. The water inlet hole 552 is used to guide the coolant to the inside and form a water ring to drive the coolant to flow in the cooling component 5. A water outlet hole 553 is provided on the side of the circular protrusion 551 on the bottom cover 55.

[0050] When the brushless motor rotates, the coolant will flow from the liquid tank 3 into the bottom cover 55 through the water inlet hole 552, and then the impeller 53 rotates to form a water ring of the coolant entering the bottom cover 55, and then flow out through the water outlet hole 553 on the side of the circular protrusion 551 on the bottom cover 55, so that the impeller 53 drives the coolant to flow in the bottom cover 55.

[0051] As shown in Figures 2 and 11, the air cover 56 is a circular structure. An air inlet 561 and an air outlet 562 are respectively opened on both sides of the outer side of the air cover 56 at any diameter. The air cover 56 isolates the coolant from the gas, draws the gas in through the negative pressure formed by the water ring, and collects the air to dissipate heat from the cooling component 5.

[0052] When the impeller 53 rotates, driving the coolant to flow, the centrifugal force causes the coolant to form a water ring around the impeller 53. Then, as the impeller 53 rotates, a negative pressure will be formed inside the water ring, and the outside air will be drawn in through the air inlet 561 on the air cover 56. The drawn-in air will be compressed and finally discharged from the air cover 56 through the exhaust hole. The discharged gas will enter the long strip through hole 579 of the circular ring 574 and be blown out from between two adjacent guide blocks 571, thereby accelerating the flow rate of the air between the guide blocks 571, realizing heat exchange of the coolant inside the guide blocks 571, and accelerating the heat dissipation effect of the heat sink 573.

[0053] As shown in Figures 2 and 11, an air intake pipe 563 is fixedly installed on the inner side of the air cover 56, and one end of the air intake pipe 563 passes through the air cover 56 and is fixedly installed on the air intake hole 561 on the inner side of the air cover 56, and the other end of the air intake pipe 563 radially passes through the side of the base and the side of the liquid storage tank 3 respectively. The air intake pipe 563 draws and compresses the outside air through negative pressure, and accelerates the air flow rate, thereby accelerating the cooling speed of the cooling component 5. Bolt connection is adopted, and a plurality of openings 31 are opened in a circular array on the outer surface of the liquid storage tank 3.

[0054] When the brushless motor rotates, the rotation of the impeller 53 inside the bottom cover 55 of the cooling assembly 5 will cause the coolant to form a water ring, and air will be drawn from the outside through the air inlet pipe 563 on the air cover 56. The air will enter between the bottom cover 55 and the air cover 56, and finally the air will be discharged to cool the coolant, thereby cooling the brushless motor and improving the service life of the brushless motor.

[0055] During the overall working process, when the brushless motor is working at high speed for a long time, the stator current flowing through the brushless motor will generate a lot of heat inside the brushless motor. Since the stator is a coil and is installed on the inner wall of the brushless motor housing, the heat will be transferred from the stator to the housing of the brushless motor. As the brushless motor works, the brushless motor will drive the impeller 53 to rotate while rotating. The rotation of the impeller 53 will drive the coolant inside the bottom cover 55 to flow. As the impeller 53 rotates at high speed, centrifugal force will be generated, causing the coolant to form a complete water ring around the bottom cover 55, and the coolant inside the reservoir 3 will flow into the bottom cover 55 through the water inlet hole 552. As the impeller 53 rotates, the coolant will flow into the bottom cover 55. The centrifugal force generated by the rotation of the wheel 53 throws the coolant into the spiral pipe 51 through the cover 54 through the centrifugal force, and the brushless motor is cooled through the spiral pipe 51. The cooled coolant will be integrated into the interior of the annular shell 572 and flow into the rectangular through-hole 575 on the guide block 571 through the rectangular groove 576 inside the annular shell 572. The coolant is quickly dissipated through the heat sink 573 on the guide block 571. Then, the coolant flows out from the rectangular through-hole 575 on the guide block 571 and flows into the strip groove 578 on the ring 574. Finally, it flows into the U-shaped tube 59 through the reflux hole 58 on the ring 574, and flows into the liquid storage tank 3 through the U-shaped tube 59.

[0056] As the impeller 53 rotates, a water ring will be formed inside the bottom cover 55, and negative pressure will be formed. Air will be drawn from the outside through the air inlet pipe 563 on the air cover 56, and the air will enter between the bottom cover 55 and the air cover 56, and the drawn air will be compressed, and finally discharged from the air cover 56 through the exhaust hole. The discharged gas will enter the long strip through hole 579 of the circular ring 574, and be blown out from between two adjacent guide blocks 571, thereby accelerating the flow rate of the air between the guide blocks 571. The discharged air dissipates heat to the coolant after heat exchange, and by accelerating the air flow rate, the coolant is cooled, and the cyclic cooling of the brushless motor is achieved, thereby improving the cooling effect and service life of the brushless motor.

[0057] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A brushless motor cooling device, comprising a motor body (1), a transmission shaft (2), a liquid storage tank (3) and a top cover (4); characterized in that: The motor body (1) further comprises a cooling assembly (5), wherein a transmission shaft (2) is fixedly mounted inside the motor body (1), and the cooling assembly (5) is fixedly mounted on the motor body (1). The cooling assembly (5) is driven to rotate by the rotation of the motor body (1), and the centrifugal force generated by the rotation is used to throw the coolant to the surroundings to form a water ring. The coolant flows out to cool the motor, and then the negative pressure in the water ring draws in the outside air and discharges it to dissipate heat for the cooling assembly (5); the liquid storage tank (3) is fixedly mounted on one end of the cooling assembly (5), and the top cover (4) is fixedly mounted on the other end of the cooling assembly (5).

2. A brushless motor cooling device according to claim 1, characterized in that: The cooling assembly (5) comprises a spiral pipe (51), a cylinder (52), an impeller (53), a cover (54), a bottom cover (55), an air cover (56) and a flow module (57); the outer surface of the motor body (1) is provided with a spiral pipe (51) for heat exchange with the internal heat of the motor; the cylinder (52) is fixedly mounted on the outer surface of the spiral pipe (51); the bottom of the cylinder (52) is fixedly mounted with a cover (54); the impeller (53) is fixedly mounted on the transmission shaft (2); the impeller (53) generates centrifugal force by rotation and forms a water ring inside the coolant, and air is drawn in and discharged by negative pressure; the bottom cover (55) is fixedly mounted on the outer side of the cover (54); the flow module (57) is fixedly mounted around the outer side of the cylinder (52); and the air cover (56) is fixedly mounted on the bottom of the cover (54).

3. A brushless motor cooling device according to claim 2, characterized in that: The flow module (57) comprises a guide block (571), an annular shell (572), a heat sink (573) and a circular ring (574); the guide block (571) is fixedly mounted in an annular array on the outer surface of the cylinder (52); one end of the guide block (571) is fixedly mounted with the annular shell (572); the guide block (571) guides the coolant and exchanges the heat of the motor with the outside world, thereby accelerating the cooling speed of the cooling component (5); a circular hole (577) is opened on the side of the annular shell (572); the circular hole (577) is interconnected with the spiral pipe (51); a heat sink (573) is fixedly mounted on the top of the guide block (571); and a circular ring (574) is fixedly mounted on the other end of the guide block (571).

4. A brushless motor cooling device according to claim 3, characterized in that: The guide block (571) is a rectangular structure, and a rectangular through hole (575) is provided at one end of the rectangular structure. A plurality of rectangular grooves (576) are provided in a circular array with the axis as the center on the inner side of the ring shell (572), and the rectangular grooves (576) cooperate with the rectangular through hole (575) to accelerate the heat exchange between the coolant and the outside, thereby allowing the coolant in the cooling component (5) to circulate. A plurality of strip grooves (578) are provided in an array with the axis as the center on the inner side of the circular ring (574), and the strip grooves (578) are interconnected with the rectangular through hole (575). A long strip through hole (579) is provided on the outer side of the circular ring (574), and the long strip through hole (579) and the rectangular through hole (575) are staggered and spaced apart from each other. The long strip through hole (579) increases the contact area between the guide block (571) and the air, thereby accelerating the heat dissipation speed of the coolant on the cooling component (5).

5. The brushless motor cooling device according to claim 3, characterized in that: A plurality of reflux holes (58) are provided on the arc-shaped surface around the circular ring (574), and the reflux holes (58) are interconnected with the strip-shaped grooves (578). A U-shaped tube (59) is fixedly installed on the reflux hole (58), and the other end of the U-shaped tube (59) is fixedly installed on the outer surface of the liquid storage tank (3). The U-shaped tube (59) is used to transport the coolant back to the liquid storage tank (3) and perform circulating cooling and heat dissipation to provide circulating coolant for the cooling component (5).

6. A brushless motor cooling device according to claim 2, characterized in that: The bottom cover (55) is a circular structure. A circular protrusion (551) is arranged inside the bottom cover (55). The circular protrusion (551) isolates the water ring from the air chamber and discharges the gas to dissipate the heat of the coolant on the cooling component (5). A water inlet hole (552) is opened at the bottom of the bottom cover (55). The water inlet hole (552) is used to guide the coolant to the inside and form a water ring to drive the coolant to flow in the cooling component (5). A water outlet hole (553) is opened on the side of the circular protrusion (551) on the bottom cover (55).

7. A brushless motor cooling device according to claim 2, characterized in that: The air cover (56) is a circular structure, and an air inlet (561) and an air outlet (562) are respectively provided on both sides of an arbitrary diameter on the outside of the air cover (56). The air cover (56) isolates the coolant from the gas, draws the gas in through the negative pressure formed by the water ring, and collects the air to dissipate heat from the cooling component (5).

8. A brushless motor cooling device according to claim 2, characterized in that: An air intake pipe (563) is fixedly installed on the inner side surface of the air cover (56), and one end of the air intake pipe (563) passes through the air cover (56) and is fixedly installed on the air intake hole (561) on the inner side surface of the air cover (56), and the other end of the air intake pipe (563) radially passes through the side surface of the base and the side surface of the liquid storage tank (3) respectively. The air intake pipe (563) draws and compresses the outside air through negative pressure and accelerates the air flow rate, thereby accelerating the cooling speed of the cooling component (5). A plurality of openings (31) are arranged in a circular array on the outer surface of the liquid storage tank (3).

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