Heat dissipation structure of external rotor motor drive, motor and centrifugal fan

Abstract

The present invention provides a heat dissipation structure of an external rotor motor driver, comprising: a driver control box, which is installed on a stator fixed end cover, a first heat dissipation structure is provided on the top of an outer shell, and a wing-shaped second heat dissipation structure surrounding the first heat dissipation structure is provided on the side wall of the outer shell; a drainage cover, which is provided on the outer shell of the driver control box and has a drainage port corresponding to the first heat dissipation structure on the top; and a centrifugal wind wheel, which is connected to the motor rotor part and comprises an annular main body, the annular main body has an air inlet opening toward the driver control box, and an air outlet opening toward the outside; wherein, a plurality of drainage holes corresponding in position are provided on the bottom of the outer shell of the driver control box and the stator fixed end cover, the drainage holes are located between the fins of the wing-shaped second heat dissipation structure, and correspond to the position of the air inlet of the centrifugal wind wheel.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a heat dissipation structure of an outer rotor motor driver, a motor and a centrifugal fan. Background Art

[0002] The DC brushless outer rotor fan has the advantages of small size and high energy efficiency. The corresponding DC brushless controller will generate a lot of heat during operation (the higher the power, the higher the temperature rise), and a corresponding heat dissipation design is required. The existing DC brushless motor, the controller heat dissipation is generally achieved through the heat dissipation mechanism on the shell, the heat dissipation efficiency often cannot meet the high power requirements, the controller efficiency is low; or the heat dissipation structure is made larger, which increases the size of the DC brushless motor and increases the cost, affecting its use. Summary of the invention

[0003] The object of the present invention is to provide a heat dissipation structure of an outer rotor motor driver designed based on a unique cooling design concept, and a motor and a centrifugal fan having good heat dissipation performance with the heat dissipation structure.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A first aspect of the present invention provides a heat dissipation structure of an outer rotor motor driver, comprising:

[0006] A driver control box is mounted on the stator fixed end cover, a first heat dissipation structure is provided on the top of the outer shell, and a wing-shaped second heat dissipation structure surrounding the first heat dissipation structure is provided on the side wall of the outer shell;

[0007] A drainage cover, which is arranged on the outer shell of the driver control box and has a drainage port corresponding to the first heat dissipation structure on the top;

[0008] and a centrifugal wind wheel connected to the motor rotor part, comprising an annular body, wherein the annular body has an air inlet opening toward the driver control box and an air outlet opening outward;

[0009] Among them, a number of drainage holes with corresponding positions are provided on the bottom of the outer shell of the driver control box and the stator fixed end cover. The drainage holes are located between the fins of the wing-shaped second heat dissipation structure and correspond to the position of the centrifugal wind wheel air inlet.

[0010] Furthermore, the first heat dissipation structure includes a plurality of columnar protrusions arranged on the top of the outer shell.

[0011] Preferably, the cross-section of the columnar protrusion is a cross-shaped plum blossom.

[0012] Furthermore, the annular body of the centrifugal wind wheel includes an annular bottom wall, an inner ring body close to the inner edge of the annular bottom wall, a first group of fan blades arranged on the annular bottom wall and the roots of which are connected to the outer wall of the inner ring body, and an outer ring body connected to the ends of the first group of fan blades; the outer ring body is coaxially arranged with the inner ring body, the air inlet is formed between the first end of the outer ring body and the free end of the inner ring body, and the air outlet is formed between the second end of the outer ring body and the annular bottom wall.

[0013] Furthermore, an annular step recessed from the annular bottom wall is provided at the connection between the annular bottom wall and the inner ring body, and a second group of fan blades is provided on the inner wall of the annular step.

[0014] Furthermore, the stator fixed end cover is provided with at least one annular flange on a side facing the centrifugal wind wheel, and the annular flange is matched with the annular body of the centrifugal wind wheel to form a gap-type joint structure.

[0015] Furthermore, the inner ring body is provided with a coupling groove inside the free end; the annular flange is provided in two, wherein the first annular flange is adapted to the inner side of the outer wall of the air inlet of the centrifugal wind wheel annular body, and the second annular flange is adapted to the coupling groove at the free end of the inner ring body.

[0016] The second aspect of the present invention provides an outer rotor motor, comprising a stator part, a rotor part and a driving part connected to the stator part, wherein the outer rotor is electronically configured with a heat dissipation structure as described in the first aspect of the present invention, wherein the rotor part is provided with a connecting flange at one end close to the driving part, and the centrifugal impeller is connected to the rotor part through the connecting flange.

[0017] A third aspect of the present invention provides a centrifugal fan, comprising a wind wheel and a motor for driving the wind wheel, wherein the motor is an outer rotor motor as described in the second aspect of the present invention, and the wind wheel is connected to the rotor part of the outer rotor motor.

[0018] Beneficial effects of the present invention:

[0019] The heat dissipation structure of the outer rotor motor driver of the present invention is based on a unique cooling design concept. A centrifugal fan wheel for cooling is added to the existing motor, and the motor rotor part is used to drive the centrifugal fan wheel to rotate. The outer shell of the driver control box and the drainage cover structure are specially designed, and the drainage holes are added to form an air circulation channel, which can force the cooling gas to be introduced, effectively cool the DC brushless controller module installed in the center of the driver control box, and evenly cool the surrounding area to achieve a good cooling effect. The entire heat dissipation structure is compactly designed, does not increase the motor volume, and has good practicality.

[0020] On the other hand, the heat dissipation structure of the present invention cleverly arranges a gap-type joint structure between the centrifugal wind wheel and the stator fixed end cover. The centrifugal wind wheel can also serve as a stopper for the dynamic and static joint surface of the motor, so that the protection level of the motor can reach IP54 and above.

[0021] The motor and centrifugal fan of the present invention using the above heat dissipation structure work at a suitable temperature, so the life and efficiency of the driver are greatly improved, thereby having good stability and reliability and enhancing market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the outer shell of the driver control box in an embodiment of the present invention.

[0023] Figure 2 for Figure 1 Bottom view of the mid-drive control box housing.

[0024] Figure 3 Schematic diagram of the structure of the stator fixed end cover in an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of the structure of the drainage cover in an embodiment of the present invention.

[0026] Figure 5 Schematic diagram of the structure of the centrifugal wind wheel in an embodiment of the present invention.

[0027] Figure 6 for Figure 3 A view from the other side of the centrifugal impeller.

[0028] Figure 7 Schematic diagram of the structure of an outer rotor motor in an embodiment of the present invention.

[0029] Figure 8 for Figure 7 Schematic cross-section of an outer rotor motor.

[0030] Fig. 9 Schematic diagram of the structure of a centrifugal fan in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0032] Example 1

[0033] The first embodiment of the present invention provides a heat dissipation structure of an outer rotor motor driver, which includes a driver control box outer shell, a stator fixed end cover, a drainage cover and a centrifugal fan wheel that are adapted to each other.

[0034] like Figure 1 and 2 As shown, in this embodiment, the outer shell 10 of the driver control box is a cylindrical cap-shaped structure as a whole, with a first heat dissipation structure 11 provided on the top, a wing-shaped second heat dissipation structure 12 surrounding the first heat dissipation structure 11 provided on the side wall, and a wiring portion 15 provided on the front of the side wall. At the same time, at the bottom edge of the outer shell 10, between the fins of the wing-shaped second heat dissipation structure 12, a plurality of drainage holes 14 are provided. Inside the outer shell 10, a mounting portion 17 for mounting a DC brushless controller module is provided, and its position corresponds to the first heat dissipation structure 11. When the DC brushless controller module is working, a large amount of heat is generated, and the generated heat is diffused to the first heat dissipation structure 11 through the top of the outer shell 10, and evenly diffused to the wing-shaped second heat dissipation structure 12 around.

[0035] As a preferred implementation, in this embodiment, the first heat dissipation structure 11 is a plurality of columnar protrusions 110 disposed on the top of the outer shell 10 .

[0036] More preferably, the cross section of the columnar protrusion 110 is in the shape of a cross plum blossom to achieve the best heat dissipation effect.

[0037] In this embodiment, the driver control box is connected to the motor stator fixed end cover through the connection hole 16 on the bottom edge of the outer shell 10. Figure 3 As shown, the side of the motor stator fixed end cover 2 away from the stator is disc-shaped, and its edge is provided with a connection hole 22 corresponding to the connection hole 16 on the outer shell 10, so that the outer shell 10 of the driver control box can be connected to the motor stator fixed end cover 2 by bolts. At the same time, the edge of the motor stator fixed end cover 2 is also provided with a plurality of drainage holes 21 corresponding to the drainage holes 14 on the outer shell 10 of the driver control box, so that air can flow through the drainage holes.

[0038] like Figure 4 As shown, in this embodiment, the drainage cover 3 is a cylindrical cap-shaped structure matching the outer shell 10 of the driver control box, and is provided with a drainage port 30 corresponding to the first heat dissipation structure 11 at the top, and a wiring part 2 31 corresponding to the wiring part 1 15 at the front. In addition, a connection hole 32 for installing the drainage cover is also provided at the bottom edge of the drainage cover 3.

[0039] In this embodiment, the centrifugal fan wheel comprises an annular body having an air inlet opening toward the driver control box and an air outlet opening outward, so that when the centrifugal fan wheel rotates, air can enter from the air inlet and be discharged from the air outlet.

[0040] like Figure 5 and 6As shown, as a preferred embodiment, the annular body of the centrifugal wind wheel includes an annular bottom wall 40, an inner ring body 41 close to the inner edge of the annular bottom wall 40, a first group of blades 42 arranged on the annular bottom wall 40 and connected to the outer wall of the inner ring body at the root, and an outer ring body 43 connected to the end of the first group of blades 42. Among them, the outer ring body 43 is coaxially arranged with the inner ring body 41, and an air inlet 44 is formed between the first end of the outer ring body 43 and the free end of the inner ring body 41, and an air outlet 45 is formed between the second end of the outer ring body 43 and the annular bottom wall 40. At the same time, a connecting hole 49 is also provided on the annular bottom wall 40 for connecting the centrifugal wind wheel to the rotor part of the motor.

[0041] In this embodiment, after the centrifugal wind wheel is installed, the position of its air inlet 44 corresponds to the position of the drainage holes 21 on the aforementioned motor stator fixed end cover 2.

[0042] The heat dissipation structure composed of the above-mentioned components in this embodiment, wherein the air inlet 30 - the first heat dissipation structure 11 - the inter-wing channel of the wing-shaped second heat dissipation structure 12 - the drainage holes 14, 21 - the centrifugal wind wheel air inlet 44 - the air outlet 45 constitute a complete air circulation channel, so that when the centrifugal wind wheel is driven to rotate by the motor rotor part, the cooling air is forced to be introduced from the air inlet 30 of the air inlet cover 3, and enters the centrifugal wind wheel through the first heat dissipation structure 11, the wing-shaped second heat dissipation structure 12 and the drainage holes 14, 21 and then discharged, forming a good cooling effect. Compared with the existing method of heat dissipation that simply relies on the heat dissipation structure of the outer shell of the driver control box, the heat dissipation efficiency is greatly improved, and the DC brushless controller module installed in the center of the driver control box can be effectively cooled. At the same time, the entire heat dissipation structure is compactly designed without increasing the volume of the motor.

[0043] The heat dissipation structure is further described below in conjunction with an embodiment of an outer rotor motor equipped with the heat dissipation structure according to the present invention.

[0044] Example 2

[0045] like Figure 7 and Figure 8 As shown, the second embodiment of the present invention provides an outer rotor motor, which is equipped with the heat dissipation structure of the first embodiment.

[0046] Specifically, the outer rotor motor includes a stator part 1001, which includes a motor stator fixed end cover 2 and a stator assembly mounted on the motor stator fixed end cover 2; a rotor part 1002, wherein the central axis is connected to the stator part through a bearing, and the housing of the outer rotor part is provided with a first flange 51 for connecting to a centrifugal wind wheel 4 and a second flange 52 for connecting to the wind wheel. In this embodiment, the outer rotor motor is further provided with a mounting plate 6. Since the basic structure of the outer rotor motor is well known to those skilled in the art, it will not be further described in detail here.

[0047] The outer rotor motor in this embodiment is equipped with the heat dissipation structure as described in the first embodiment. When the rotor part rotates, it can drive the centrifugal fan wheel to rotate, thereby forcibly introducing cooling air through the aforementioned air circulation channel, effectively cooling the DC brushless controller module 13 installed in the outer shell 10 of the driver control box 1, thereby greatly improving the life and efficiency of the driver, thereby improving the stability and reliability of the motor.

[0048] As a further preferred embodiment, in the first and second embodiments of the present invention, Figure 6 As shown, the connection between the annular bottom wall 40 and the inner ring body 41 of the centrifugal wind wheel 4 is provided with an annular step 46 which is concave from the annular bottom wall, and a second set of blades 47 is provided on the inner wall of the annular step. Figure 8 As shown, the second set of fan blades 47 corresponds to the internal space between the stator part and the rotor part of the outer rotor motor. Therefore, when the centrifugal fan wheel 4 is driven to rotate, the internal space of the motor can be cooled at the same time, further improving the overall heat dissipation efficiency of the motor and making it have better stability and reliability.

[0049] As a further preferred embodiment, in the first and second embodiments of the present invention, at least one annular flange is provided on the side of the stator fixed end cover 2 facing the centrifugal wind wheel, and the annular flange is matched with the annular body of the centrifugal wind wheel 4 to form a gap-type joint structure.

[0050] Preferably, Figure 5 As shown, the inner ring of the centrifugal impeller 4 is provided with an engagement groove 48 at the inner part of the free end. Figure 8 As shown, there are two annular flanges on the stator fixed end cover 2, wherein the first annular flange 22 is matched with the inner side of the outer wall of the air inlet of the centrifugal wind wheel annular body, and the second annular flange 23 is matched with the engaging groove 48 at the free end of the inner ring body.

[0051] With the above structure, the centrifugal wind wheel can also serve as a stopper for the dynamic and static joint surface of the motor, so that the protection level of the motor can reach IP54 or above.

[0052] Example 3

[0053] like Fig. 9 As shown, the third embodiment of the present invention provides a centrifugal fan, including a wind wheel 1005 and a motor for driving the wind wheel, the motor is the outer rotor motor described in the second embodiment, and the wind wheel 1004 is connected to the rotor part of the outer rotor motor through the aforementioned second flange 52.

[0054] Since the outer rotor motor of the present invention has the good heat dissipation performance and protective structure as described above, the centrifugal fan in this embodiment has better stability and reliability than the existing centrifugal fans, and thus has stronger market competitiveness.

[0055] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A heat dissipation structure of an outer rotor motor driver, characterized in that: include: A driver control box (1) is mounted on a stator fixed end cover (2), a first heat dissipation structure (11) is provided on the top of an outer shell (10), and a wing-shaped second heat dissipation structure (12) surrounding the first heat dissipation structure (11) is provided on the side wall of the outer shell; the first heat dissipation structure (11) includes a plurality of columnar protrusions (110) provided on the top of the outer shell; and a mounting portion (17) for mounting a brushless DC controller module is provided inside the outer shell (10), the position of which corresponds to the first heat dissipation structure (11); A drainage cover (3), which is arranged on the outer shell (10) of the driver control box and has a drainage port (30) corresponding to the first heat dissipation structure (11) at the top; and a centrifugal wind wheel (4), which is connected to the motor rotor part and comprises an annular body, wherein the annular body has an air inlet (44) opening toward the driver control box (1) and an air outlet (45) opening outwards; A plurality of drainage holes (14, 21) with corresponding positions are respectively provided on the bottom of the outer shell (10) of the driver control box (1) and the stator fixed end cover, the drainage holes are located between the fins of the wing-shaped second heat dissipation structure (12) and correspond to the position of the centrifugal wind wheel air inlet (44); The annular body of the centrifugal wind wheel comprises an annular bottom wall (40), an inner ring body (41) close to the inner edge of the annular bottom wall (40), a first group of blades (42) arranged on the annular bottom wall (40) and connected at their roots to the outer wall of the inner ring body, and an outer ring body (43) connected to the ends of the first group of blades (42); the outer ring body (43) and the inner ring body (41) are coaxially arranged, the air inlet (44) is formed between the first end of the outer ring body (43) and the free end of the inner ring body (41), and the air outlet (45) is formed between the second end of the outer ring body (43) and the annular bottom wall (40); an annular step (46) concave from the annular bottom wall is provided at the connection between the annular bottom wall (40) and the inner ring body (41), and a second group of blades (47) is provided on the inner wall of the annular step.

2. The heat dissipation structure of the motor driver according to claim 1, characterized in that: The cross section of the columnar protrusion (110) is in the shape of a cross plum blossom.

3. The heat dissipation structure of the motor driver according to any one of claims 1 to 2, characterized in that: The stator fixed end cover (2) is provided with at least one annular flange on the side facing the centrifugal wind wheel, and the annular flange is matched with the annular body of the centrifugal wind wheel (4) to form a gap-type joint structure.

4. The heat dissipation structure of the motor driver according to claim 3, characterized in that: The inner ring body is provided with a coupling groove (48) at the inner part of the free end; the annular flange is provided in two, wherein the first annular flange (22) is adapted to the inner side of the outer wall of the air inlet of the centrifugal wind wheel annular body, and the second annular flange (23) is adapted to the coupling groove (48) at the free end of the inner ring body.

5. An outer rotor motor, comprising a stator part (1001), a rotor part (1002) and a driving part (1003) connected to the stator part, characterized in that: The outer rotor motor is equipped with a heat dissipation structure as described in any one of claims 1 to 4, wherein the rotor part (1001) is provided with a connecting flange (51) at one end close to the driving part (1003), and the centrifugal wind wheel (4) is connected to the rotor part via the connecting flange.

6. A centrifugal fan, comprising a wind wheel and a motor for driving the wind wheel, characterized in that: The motor is the outer rotor motor as claimed in claim 5, and the wind wheel (1004) is connected to the rotor part (1002) of the outer rotor motor.

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