A heat dissipation structure of a brushless direct current motor

Abstract

This utility model relates to the field of brushless DC motor technology and discloses a heat dissipation structure for a brushless DC motor. The heat dissipation structure includes a protective cover, with the brushless DC motor body fixedly installed at one end inside the protective cover. A heat dissipation component is provided on the brushless DC motor body. To improve heat dissipation, this structure utilizes a heat dissipation component. When a micro-pump on the outlet pipe is activated, the coolant in the storage tank is drawn into a longitudinal spiral tube. The longitudinal spiral tube, wound around the brushless DC motor body, allows the coolant to better carry away the heat generated during operation, causing the coolant to heat up. The coolant then sequentially passes through a bottom pipe, a bend, a transverse spiral tube, an inlet pipe, an outlet pipe, and back to the storage tank. The spiral shape of the transverse spiral tube further enhances the cooling effect, effectively dissipating heat from the brushless DC motor body.

Description

Technical Field

[0001] This utility model relates to the field of brushless DC motor technology, specifically to a heat dissipation structure for a brushless DC motor. Background Technology

[0002] In today's industrial field, brushless DC motors are widely used in many key equipment and systems, such as electric vehicles, two-wheeled electric motorcycles, and various household appliances, due to their advantages such as high efficiency, energy saving, long life and good control performance. Brushless DC motors consist of a motor body and a driver, and are a typical mechatronic product.

[0003] However, when it is necessary to protect the main body of the brushless DC motor, a cover structure is added to its exterior. However, when the brushless DC motor is running, the internal electromagnetic conversion, mechanical friction and other processes will continuously generate heat. If the heat cannot be dissipated in time as the running time increases, the motor temperature will continue to rise, which will affect the motor performance and service life.

[0004] Currently, in existing technologies, such as Chinese Patent No. CN216599237U, a high-efficiency heat dissipation device for the stator of a brushless DC motor is disclosed. This device uses a fan blade installed at one end of the rotor of the brushless DC motor. When the brushless DC motor is powered on, the rotor of the brushless DC motor drives the fan blade to rotate at high speed, thereby sending air to the stator inside the brushless DC motor housing to dissipate heat. The rotor of the brushless DC motor drives the mounting cap and brush to rotate, cleaning the dust filter and preventing dust from covering the dust filter, thereby improving the heat dissipation efficiency of the brushless DC motor stator.

[0005] However, this method has obvious shortcomings. Driving the fan and brush to rotate via the motor rotor consumes additional motor power, resulting in a decrease in the overall power of the motor, affecting the speed, and increasing energy consumption, thus reducing the practicality of the motor in actual applications. Cleaning the dust filter will stir up dust that would not normally fly, which will further reduce its practicality. It cannot effectively utilize the three heat dissipation methods of natural initial heat dissipation from the heat sink, water cooling circulation, and air cooling to work together and dissipate heat from multiple dimensions and through multiple channels to cool the brushless DC motor body. In view of this, we propose a heat dissipation structure for brushless DC motors. Utility Model Content

[0006] The purpose of this invention is to provide a heat dissipation structure for a brushless DC motor to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A heat dissipation structure for a brushless DC motor includes a protective cover. A brushless DC motor body is fixedly mounted inside one end of the protective cover, and a heat sink is snapped into the other end of the protective cover. A heat dissipation assembly is disposed on the brushless DC motor body, and the heat dissipation assembly includes:

[0009] The liquid storage tank is fixedly installed inside the end of the protective cover away from the heat sink. A liquid replacement valve is provided at one end of the liquid storage tank. The other end of the liquid storage tank is fixedly connected to one end of the liquid outlet pipe. The other end of the liquid outlet pipe is fixedly installed at the input end of the micro water pump. The micro water pump is fixedly installed on the top of the protective cover.

[0010] The longitudinal spiral tube is fixedly connected to one end of the output end of the micro water pump. The longitudinal spiral tube is spirally wound around the outside of the brushless DC motor body. The other end of the longitudinal spiral tube is fixedly connected to one end of the bottom tube. The other end of the bottom tube is fixedly connected to one end of the bend tube.

[0011] A horizontal spiral tube is provided on the outside of the brushless DC motor body. One end of the water inlet pipe is fixedly installed at the center of the horizontal spiral tube. The other end of the water inlet pipe is fixedly connected to the end of the bend away from the bottom pipe. One end of the horizontal spiral tube away from its center is fixedly connected to one end of the water outlet pipe. The other end of the water outlet pipe is fixedly connected to one end of the liquid inlet pipe. The other end of the liquid inlet pipe is fixedly installed on the liquid storage tank. A one-way valve is provided on the water outlet pipe.

[0012] In a further embodiment, the heat sink is provided with through-holes for heat dissipation, allowing hot air to escape through the holes for initial heat dissipation.

[0013] In a further embodiment, the storage tank is filled with coolant.

[0014] In a further embodiment, the liquid storage tank, the liquid outlet pipe, the micro water pump, the longitudinal spiral pipe, the bottom pipe, the bend pipe, the transverse spiral pipe, the water inlet pipe, the water outlet pipe, and the internal connection of the liquid inlet pipe are interconnected, so that the coolant can circulate better.

[0015] In a further embodiment, the protective cover is provided with an auxiliary component, which includes a rectangular frame. The rectangular frame is fixedly installed inside the side wall of the protective cover, and fins are fixedly installed on the rectangular frame. Multiple sets of fins are provided, and the multiple sets of fins are arranged in a linear array with equal spacing. A cavity is provided inside the fins, and the transverse spiral tube is snapped onto the multiple sets of fins for better heat dissipation.

[0016] In a further embodiment, the rectangular frame is provided with through rectangular slots, and multiple sets of rectangular slots are provided.

[0017] In a further embodiment, an axial flow fan is fixedly installed inside the side wall of the protective cover away from the rectangular frame. The brushless DC motor body, the rectangular frame, and the axial flow fan are at the same horizontal level for better heat dissipation.

[0018] Compared with the prior art, this utility model provides a heat dissipation structure for a brushless DC motor, which has the following beneficial effects:

[0019] 1. The heat dissipation structure of this brushless DC motor is designed to better dissipate heat from the main body of the brushless DC motor. A heat dissipation assembly is installed, initially working with the heat sink on the protective cover. When the micro water pump on the outlet pipe is activated, the coolant inside the reservoir is drawn into the longitudinal spiral tube. The longitudinal spiral tube, wound around the main body of the brushless DC motor, effectively removes the heat generated during operation, while simultaneously raising the coolant temperature. The coolant then flows sequentially through the bottom pipe, bend pipe, transverse spiral tube, inlet pipe, outlet pipe, and back to the reservoir. The spiral shape of the transverse spiral tube further enhances the cooling effect. A one-way valve ensures unidirectional flow of the coolant, and a coolant replacement valve facilitates coolant replacement. In summary, this design effectively dissipates heat from the main body of the brushless DC motor.

[0020] 2. The heat dissipation structure of this brushless DC motor is equipped with auxiliary components to improve heat dissipation. When the heat dissipation components are working, the axial flow fan is activated, and the resulting airflow is blown onto the brushless DC motor body for air cooling. Part of the airflow is discharged through the heat sink, and part is blown onto the rectangular frame and discharged through the rectangular slot. At the same time, the transverse spiral tube is installed inside the fins, so that the airflow can better remove the heat of the coolant inside the transverse spiral tube. After the coolant is cooled, it returns to the liquid storage tank. The combination of water cooling and air cooling further improves the heat dissipation effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a first-view sectional view of the protective cover of this utility model;

[0023] Figure 3 This is a second-view sectional view of the protective cover of this utility model;

[0024] Figure 4 This is a third-view sectional view of the protective cover of this utility model;

[0025] Figure 5 This is a schematic diagram of the connection of a portion of the heat dissipation component of this utility model;

[0026] Figure 6This is a schematic diagram of the rectangular frame and some structural connections of this utility model.

[0027] Explanation of icon numbers:

[0028] 1. Protective cover; 2. Brushless DC motor body; 3. Heat sink;

[0029] 4. Heat dissipation components; 41. Liquid storage tank; 42. Liquid replacement valve; 43. Liquid outlet pipe; 44. Miniature water pump; 45. Longitudinal spiral tube; 46. Bottom tube; 47. Bend; 48. Transverse spiral tube; 49. Water inlet pipe; 410. Water outlet pipe; 411. Liquid inlet pipe; 412. Check valve;

[0030] 5. Auxiliary components; 51. Rectangular frame; 52. Fins; 53. Rectangular groove; 54. Axial flow fan. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] In this application, the term "above" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is primarily used to better describe this application and its embodiments, and is not intended to limit the indicated device, element, or component to having a specific orientation, or to construct and operate in a specific orientation. Furthermore, the term "above" may also be used in certain circumstances to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0033] Please see Figures 1-6 This utility model provides a technical solution:

[0034] A heat dissipation structure for a brushless DC motor includes a protective cover 1. A brushless DC motor body 2 is fixedly installed at one end inside the protective cover 1, and a heat sink 3 is snapped into the other end of the protective cover 1. The heat sink 3 has through-holes for heat dissipation. When protection of the brushless DC motor body 2 is required, a cover structure is added to its exterior. However, during operation, the brushless DC motor body 2 continuously generates heat through internal electromagnetic conversion and mechanical friction processes. If this heat cannot be dissipated in time, the motor temperature will rise continuously, affecting motor performance and lifespan. At this point, the heat sink 3 on the protective cover 1, with its through-holes, provides initial heat dissipation, allowing hot air to escape from the protective cover 1 into the external environment, thus achieving initial heat dissipation.

[0035] In one embodiment of this utility model, a heat dissipation assembly 4 is provided on the brushless DC motor body 2. The heat dissipation assembly 4 includes a liquid storage tank 41, which is filled with coolant. The liquid storage tank 41 is fixedly installed inside the protective cover 1 at the end away from the heat sink 3. A liquid replacement valve 42 is provided at one end of the liquid storage tank 41. The other end of the liquid storage tank 41 is fixedly connected to one end of an outlet pipe 43. The other end of the outlet pipe 43 is fixedly installed at the input end of a micro water pump 44. The micro water pump 44 is fixedly installed on the top of the protective cover 1. The output end of the micro water pump 44 is fixedly connected to one end of a longitudinal spiral tube 45. The longitudinal spiral tube 45 is spirally wound around the outside of the brushless DC motor body 2. The other end of the longitudinal spiral tube 45 is fixedly connected to one end of a bottom tube 46. The other end of the bottom tube 46 is fixedly connected to a bend tube 4. At one end of 7, a horizontal spiral tube 48 is provided on the outside of the brushless DC motor body 2. One end of the water inlet pipe 49 is fixedly installed at the center of the horizontal spiral tube 48. The other end of the water inlet pipe 49 is fixedly connected to the end of the bend pipe 47 away from the bottom pipe 46. The end of the horizontal spiral tube 48 away from its center is fixedly connected to one end of the water outlet pipe 410. The other end of the water outlet pipe 410 is fixedly connected to one end of the liquid inlet pipe 411. The other end of the liquid inlet pipe 411 is fixedly installed on the liquid storage tank 41. A one-way valve 412 is provided on the water outlet pipe 410. In addition, the liquid storage tank 41, the liquid outlet pipe 43, the micro water pump 44, the longitudinal spiral tube 45, the bottom pipe 46, the bend pipe 47, the horizontal spiral tube 48, the water inlet pipe 49, the water outlet pipe 410, and the liquid inlet pipe 411 are internally connected, so that the coolant can circulate better.

[0036] In this embodiment, when the initial heat dissipation is insufficient to meet the heat dissipation requirements of the brushless DC motor body 2, the heat dissipation component 4 intervenes, activating the micro water pump 44 on the outlet pipe 43. After the micro water pump 44 is powered on, its internal impeller rotates at high speed, generating suction. Under this suction, the coolant pre-filled in the storage tank 41 is drawn through the outlet pipe 43 into the longitudinal spiral tube 45. Since the longitudinal spiral tube 45 is tightly wound around the outside of the brushless DC motor body 2 in a spiral shape, it is in full contact with the surface of the brushless DC motor body 2, resulting in a large contact area. According to the principle of heat transfer, the higher-temperature brushless DC motor body 2 will transfer heat to the relatively lower-temperature coolant, causing the coolant temperature to rise continuously while effectively reducing the temperature of the brushless DC motor body 2. The heated coolant continues to flow, passing sequentially through the bottom pipe 46, the bend pipe 47, and the inlet pipe 49, finally entering the transverse spiral tube. The unique spiral shape of the spiral tube 48 greatly increases the contact area and contact time between the coolant and the external environment. During the flow of the coolant in the spiral tube, heat is exchanged with the outside air through the tube wall. The cold outside air absorbs the heat of the coolant, causing the coolant to gradually cool down. Subsequently, the coolant returns to the storage tank 41 through the outlet pipe 410 and the inlet pipe 411. During this cycle, the one-way valve 412 on the outlet pipe 410 only allows the coolant to flow in the direction from the outlet pipe 410 to the inlet pipe 411, preventing backflow and ensuring that the entire cooling cycle system operates stably in the predetermined direction. The coolant exchange valve 42 allows the operator to drain the old coolant from the storage tank 41 and inject new coolant after the coolant has been used for a period of time and its cooling performance has declined. This maintains the efficient operation of the cooling system and enables better heat dissipation.

[0037] In one embodiment of this utility model, an auxiliary component 5 is provided on the protective cover 1. The auxiliary component 5 includes a rectangular frame 51. The rectangular frame 51 is fixedly installed inside the side wall of the protective cover 1. Fins 52 are fixedly installed on the rectangular frame 51. Multiple sets of fins 52 are provided, and the multiple sets of fins 52 are linearly arrayed with equal spacing. A cavity is provided inside the fins 52. A transverse spiral tube 48 is snapped onto the multiple sets of fins 52 for better heat dissipation. In addition, a through rectangular groove 53 is opened on the rectangular frame 51. Multiple sets of rectangular grooves 53 are provided. In addition, an axial flow fan 54 is fixedly installed inside the side wall of the protective cover 1 away from the rectangular frame 51. The brushless DC motor body 2, the rectangular frame 51 and the axial flow fan 54 are at the same horizontal height for better heat dissipation.

[0038] In this embodiment, to further enhance the heat dissipation effect, the auxiliary component 5 works in conjunction. When the heat dissipation component 4 starts working, the axial flow fan 54 is also activated. After the axial flow fan 54 is powered on, its internal blades rotate at high speed, pushing air to flow along the axial direction, generating airflow. This airflow directly blows onto the brushless DC motor body 2, accelerating the airflow speed on its surface. According to the principle of convection heat transfer, increased airflow significantly improves the convection heat transfer coefficient, thereby accelerating the dissipation of heat from the surface of the brushless DC motor body 2, achieving air cooling. Part of the airflow is discharged outside the protective cover 1 through the heat dissipation holes on the heat sink 3, while the other part blows onto the rectangular frame 51. Multiple sets of through rectangular slots 53 on the rectangular frame 51 provide an exhaust channel for the airflow, allowing it to smoothly exit from inside the protective cover 1. Simultaneously, the transverse spiral tube 48 is snapped onto multiple sets of fins 52, which are provided with multiple sets of equally spaced lines. The axial flow fan 54 surrounds the transverse spiral tube 48. When the airflow generated by the axial flow fan 54 passes through the fins 52, it can fully contact the surface of the transverse spiral tube 48, carrying away the heat of the heated coolant inside the tube, further accelerating the cooling process of the coolant. The cooled coolant returns to the storage tank 41 and participates in the cooling cycle again. Through the natural initial heat dissipation of the heat dissipation plate 3 of the protective cover 1, the water cooling circulation heat dissipation of the heat dissipation component 4, and the air cooling heat dissipation of the auxiliary component 5, the three heat dissipation methods cooperate and work together to dissipate heat from multiple dimensions and paths to the brushless DC motor body 2, effectively reducing the operating temperature of the brushless DC motor body 2 and ensuring its stable, efficient and long-term operation. At the same time, the heat generated by the micro water pump 44 and the axial flow fan 54 when they work will not enter the interior of the protective cover 1, and the brushless DC motor body 2 does not need to be used for power supply, so the brushless DC motor body 2 does not need to increase its output power.

[0039] All electrical components appearing in this application are electrically connected to the controller and power supply on the equipment to be installed. The controller is a conventional and known device that can control the brushless DC motor body 2, the micro water pump 44, and the axial flow fan 54. All standard parts used in this application can be purchased from the market. The specific connection methods of each part are all conventional methods such as riveting and welding that are mature in the prior art. The machinery, parts, and equipment are all conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0040] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A heat dissipation structure for a brushless DC motor, comprising a protective cover (1), wherein a brushless DC motor body (2) is fixedly installed at one end inside the protective cover (1), and a heat dissipation plate (3) is snapped into the other end of the protective cover (1), characterized in that: The brushless DC motor body (2) is provided with a heat dissipation assembly (4), which includes: The liquid storage tank (41) is fixedly installed inside the end of the protective cover (1) away from the heat sink (3). A liquid replacement valve (42) is provided at one end of the liquid storage tank (41). The other end of the liquid storage tank (41) is fixedly connected to one end of the liquid outlet pipe (43). The other end of the liquid outlet pipe (43) is fixedly installed at the input end of the micro water pump (44). The micro water pump (44) is fixedly installed on the top of the protective cover (1). A longitudinal spiral tube (45) is fixedly connected to one end of the output end of the micro water pump (44). The longitudinal spiral tube (45) is spirally wound around the outside of the brushless DC motor body (2). The other end of the longitudinal spiral tube (45) is fixedly connected to one end of the bottom tube (46). The other end of the bottom tube (46) is fixedly connected to one end of the bend tube (47). A horizontal spiral tube (48) is provided on the outside of the brushless DC motor body (2). One end of the water inlet pipe (49) is fixedly installed at the center of the horizontal spiral tube (48). The other end of the water inlet pipe (49) is fixedly connected to the end of the bend pipe (47) away from the bottom pipe (46). The end of the horizontal spiral tube (48) away from its center is fixedly connected to one end of the water outlet pipe (410). The other end of the water outlet pipe (410) is fixedly connected to one end of the liquid inlet pipe (411). The other end of the liquid inlet pipe (411) is fixedly installed on the liquid storage tank (41). A one-way valve (412) is provided on the water outlet pipe (410).

2. The heat dissipation structure of a brushless DC motor according to claim 1, characterized in that: The heat sink (3) has through-holes for heat dissipation.

3. The heat dissipation structure of a brushless DC motor according to claim 1, characterized in that: The storage tank (41) is filled with coolant.

4. The heat dissipation structure of a brushless DC motor according to claim 3, characterized in that: The liquid storage tank (41), liquid outlet pipe (43), micro water pump (44), longitudinal spiral pipe (45), bottom pipe (46), bend pipe (47), transverse spiral pipe (48), water inlet pipe (49), water outlet pipe (410), and liquid inlet pipe (411) are internally connected.

5. The heat dissipation structure of a brushless DC motor according to claim 1, characterized in that: An auxiliary component (5) is provided on the protective cover (1). The auxiliary component (5) includes a rectangular frame (51). The rectangular frame (51) is fixedly installed inside the side wall of the protective cover (1). A fin (52) is fixedly installed on the rectangular frame (51). There are multiple sets of fins (52), and the multiple sets of fins (52) are arranged in a linear array with equal spacing. A cavity is provided inside the fins (52). The transverse spiral tube (48) is snapped onto the multiple sets of fins (52).

6. The heat dissipation structure of a brushless DC motor according to claim 5, characterized in that: The rectangular frame (51) has through rectangular slots (53), and multiple sets of rectangular slots (53) are provided.

7. The heat dissipation structure of a brushless DC motor according to claim 6, characterized in that: An axial flow fan (54) is fixedly installed inside the side wall of the protective cover (1) away from the rectangular frame (51). The brushless DC motor body (2), the rectangular frame (51) and the axial flow fan (54) are at the same horizontal level.

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