Direct-current brushless cooling fan

Abstract

The utility model belongs to the technical field of centrifugal radiators, and discloses a direct-current brushless cooling fan. The fan comprises a fan frame and a driving motor, the fan frame comprises a bottom plate and a surrounding baffle, the surrounding baffle extends on the periphery of the bottom plate, an inner cavity is defined by the surrounding baffle, and a mounting position is arranged on the surrounding baffle; the driving motor comprises a stator assembly and a driving control board, the stator assembly is arranged in the inner cavity, and the driving control board is electrically connected to the stator assembly and arranged on the installation position. Through the above arrangement, the drive control panel and the stator assembly are not assembled any more, the stator assembly has a larger available space to improve the heat dissipation efficiency, heat generated by working heating of the stator assembly cannot be directly transmitted to the drive control panel, the temperature of the drive control panel is reduced, and the service life of the drive control panel is prolonged. And the phenomenon that heat is accumulated at the bottom of the stator assembly is avoided, so that the cooling fan does not need to be used in a derating manner, the cooling performance of the cooling fan is ensured, the service life is effectively prolonged, and the safety and the stability are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal radiator technology, and in particular to a DC brushless cooling fan. Background Technology

[0002] The DC brushless cooling fan connects directly to the power supply, has no internal brushes, runs more smoothly, has a longer lifespan, and produces less noise and vibration, thus having greater practical value.

[0003] In traditional DC brushless cooling fans, silicon steel sheets are coated with insulation and assembled with a winding frame. Enamelled wire is then wound around the assembled silicon steel sheets, which are then thermally fixed to the motor control board using the winding frame posts. However, the motor control board occupies a significant amount of space, limiting the design space for the motor. Furthermore, the electronic components on the motor control board are very close to the enamelled wire. When the motor is operating, the enamelled wire generates a large amount of heat, which is transferred to the electronic components, causing them to overheat. This necessitates reducing the fan speed, resulting in a low fan speed that cannot meet the user's cooling needs. Maintaining a high frequency, on the other hand, can easily lead to overheating and damage to the electronic components, compromising the longevity of the cooling fan.

[0004] Therefore, it is necessary to design a DC brushless cooling fan to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this invention is to provide a DC brushless cooling fan that can effectively improve heat dissipation performance while ensuring its service life.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A DC brushless cooling fan includes: a fan frame, comprising a base plate and a baffle plate, the baffle plate extending from the outer periphery of the base plate and forming an inner cavity, and a mounting position provided on the baffle plate; a drive motor, comprising a stator assembly and a drive control board, the stator assembly being disposed within the inner cavity, and the drive control board being electrically connected to the stator assembly and disposed on the mounting position.

[0008] Preferably, the enclosure plate is provided with a receiving groove, the top of the receiving groove has an open end, the space inside the receiving groove forms the mounting position, and the drive control board can be inserted into the receiving groove through the open end.

[0009] Preferably, each of the two opposite side walls of the receiving groove is provided with a positioning support, the two positioning supports of the two side walls are spaced apart, and an assembly gap is defined between the two positioning supports, and the drive control plate is inserted into the receiving groove through the assembly gap; or, the receiving groove is provided with two fasteners with their open ends facing each other, and the two ends of the drive control plate are respectively inserted into the corresponding fasteners.

[0010] Preferably, the top edge of the positioning post is higher than the top edge of the drive control plate, and the portion of the positioning post that is higher than the drive control plate can be formed by hot melting to form an arc-shaped fixing part that bends toward the opposite positioning post, so that the two arc-shaped fixing parts can be fixedly connected and the drive control plate is limited and positioned in the receiving groove.

[0011] Preferably, the receiving groove is further filled with a structural adhesive curing protective layer, which is wrapped around the outer peripheral surface of the drive control board.

[0012] Preferably, the stator assembly includes multiple silicon steel sheet groups and multiple enameled wires. The multiple silicon steel sheet groups are arranged circumferentially and fixedly disposed in the inner cavity. The enameled wires are correspondingly wound around the silicon steel sheet groups one by one. The same-phase portions of the multiple enameled wires can be connected in parallel to form multiple same-phase leads.

[0013] The base plate is provided with a first wire passing hole, the bottom of the receiving groove is provided with a second wire passing hole, and a plurality of the same phase lead-out ends pass through the first wire passing hole and the second wire passing hole and are connected to the drive control board.

[0014] Preferably, the fan frame further includes an insulating adhesive layer, which is disposed at the bottom of the base plate and extends horizontally between the first wire hole and the second wire hole. The upper and lower surfaces of the insulating adhesive layer are respectively bonded to the base plate and the plurality of in-phase leads.

[0015] Preferably, the sector frame further includes an adhesive layer, which is disposed opposite to the insulating adhesive layer and is attached to and covers the plurality of in-phase leads.

[0016] Preferably, the base plate is a metal plate, and insulating Mylar is sandwiched between the silicon steel sheet assembly and the base plate.

[0017] Preferably, the drive control board is provided with a chip packaging structure, which is a wafer-level double-sided leadless flat package.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] The DC brushless cooling fan provided in this embodiment abandons the existing practice of placing the drive control board at the bottom of the stator assembly. Instead, it separates the drive control board from the bottom of the stator assembly and places it independently in the inner cavity. This eliminates the need for assembly and configuration of the drive control board with the stator assembly, thereby increasing the design space of the stator assembly. This allows the stator assembly to have more usable space to improve heat dissipation efficiency. At the same time, the heat generated by the stator assembly during the operation of the cooling fan is not directly transferred to the drive control board, reducing the temperature of the drive control board and avoiding the accumulation of heat at the bottom of the stator assembly. This eliminates the need to derate the cooling fan, ensuring its heat dissipation performance and effectively improving its service life and safety stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the DC brushless cooling fan provided in this embodiment of the utility model;

[0021] Figure 2 This is an exploded view of the DC brushless cooling fan provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the hidden part of the DC brushless cooling fan provided in this embodiment of the utility model;

[0023] Figure 4 This is a cross-sectional view of the DC brushless cooling fan provided in this embodiment of the utility model;

[0024] Figure 5 This is an assembly drawing of the positioning support and drive control board before hot-melting, provided in this embodiment of the utility model.

[0025] Figure 6 This is an assembly diagram of the positioning support and drive control board after hot melting, provided in this embodiment of the utility model.

[0026] Figure 7 This is a schematic diagram showing the connection between the buckle and the drive control board provided in other embodiments of this utility model;

[0027] Figure 8 This is a schematic diagram of the drive motor provided in another embodiment of the present invention.

[0028] In the picture:

[0029] 100. Hot melt equipment;

[0030] 1. Sash frame; 101. Inner cavity; 102. Exhaust passage; 11. Base plate; 111. First wire hole; 12. Enclosure plate; 121. Mounting position; 122. Arc-shaped baffle; 123. Support block; 124. Partition plate; 125. Positioning support column; 1251. Assembly gap; 1252. Arc-shaped fixing part; 126. Fastener; 13. Top cover; 131. Air intake passage; 14. Insulating Mylar; 15. Metal central tube; 16. Rotary bearing;

[0031] 2. Drive motor; 21. Stator assembly; 211. Silicon steel sheet assembly; 212. Enamelled wire; 2121. In-phase lead; 22. Drive control board; 23. Motor housing; 24. Metal shaft core; 25. Lead wire; 26. Magnet; 3. Fan blade. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] The technical solution provided by this utility model will be described below with reference to the accompanying drawings and specific embodiments.

[0037] Currently, DC brushless cooling fans on the market, especially thin DC brushless centrifugal cooling fans, face technical problems such as low fan motor efficiency, high input power consumption, and severe motor heat generation. Due to space limitations in traditional fan structures, adjusting motor parameters is also difficult to provide users with greater cooling effects. This is a common phenomenon in thin DC brushless centrifugal cooling fans on the market.

[0038] To address the aforementioned technical problems, this embodiment provides a DC brushless cooling fan, which can be applied to thin DC brushless centrifugal cooling fans. By appropriately optimizing the internal flow channel of the cooling fan, a more efficient motor can be designed, improving the fan's heat dissipation conditions and thus significantly increasing the cooling efficiency of this type of cooling fan. The following uses a traditional DC brushless cooling fan structure as an example to specifically explain the improvement measures for this type of cooling fan.

[0039] Combination Figures 1 to 3 As shown, the DC brushless cooling fan provided in this embodiment includes a fan frame 1 and a drive motor 2. The fan frame 1 includes a base plate 11 and a baffle plate 12. The baffle plate 12 extends outward from the base plate 11 and forms an inner cavity 101. A mounting position 121 is provided on the baffle plate 12. The drive motor 2 includes a stator assembly 21 and a drive control board 22. The stator assembly 21 is disposed in the inner cavity 101. The drive control board 22 is electrically connected to the stator assembly 21 and is disposed on the mounting position 121.

[0040] The DC brushless cooling fan provided in this embodiment abandons the existing practice of placing the drive control board 22 at the bottom of the stator assembly 21. Instead, it separates the drive control board 22 from the bottom of the stator assembly 21 and independently places it in the inner cavity 101. This eliminates the need for the drive control board 22 to be assembled with the stator assembly 21, thereby increasing the design space of the stator assembly 21. This allows the stator assembly 21 to have more usable space to improve heat dissipation efficiency. At the same time, the heat generated by the stator assembly 21 during operation will not be directly transferred to the drive control board 22, reducing the temperature of the drive control board 22 and avoiding the accumulation of heat at the bottom of the stator assembly 21. This eliminates the need to derate the cooling fan, ensuring its heat dissipation performance and effectively improving its service life and safety stability.

[0041] Specifically, the enclosure 12 includes an arc-shaped baffle 122 and a support block 123, and the fan frame 1 also includes an upper cover 13. The arc-shaped baffle 122 extends around a portion of the edge of the base plate 11, the support block 123 is disposed on the remaining portion of the base plate 11, and the upper cover 13 is disposed opposite to the base plate 11, so that the arc-shaped baffle 122 and the support block 123 can jointly support the upper cover 13 above the base plate 11, and the upper cover 13 is provided with an air intake channel 131 communicating with the inner cavity 101. Along the circumferential direction of the base plate 11, both ends of the arc-shaped baffle 122 are spaced apart from the support block 123 to form two exhaust channels 102 for heat dissipation of the cooling fan at the edge of the fan frame 1. The exhaust channels 102 are connected to the inner cavity 101. With the above arrangement, after the high-temperature airflow enters the inner cavity 101 from the air inlet channel 131, it can be discharged outward from the two exhaust channels 102 respectively, thereby realizing the effective diversion of the high-temperature airflow, avoiding heat concentration, and further improving the heat dissipation efficiency.

[0042] One implementation of this embodiment is as follows, referring to... Figure 3 As shown, the enclosure 12 also includes a partition 124. In this embodiment, the partition 124 has a flat plate structure, and both ends of the partition 124 are fixedly connected to the arc-shaped baffle 122, so as to form a receiving groove with a certain installation space between the arc-shaped baffle 122 and the partition 124. The receiving groove defines the mounting position 121. The top of the receiving groove has an open end, so that the drive control board 22 can be installed on the fan frame 1 by inserting it into the receiving groove through the open end, thereby simplifying the assembly method of the drive control board 22 and improving the assembly efficiency. The mounting position 121 formed by adding the partition 124 ensures that the drive control board 22 is simple and reliable to install, and has minimal impact on the airflow and air pressure of the cooling fan when the fan speed remains unchanged, thereby effectively maintaining the overall performance of the cooling fan.

[0043] Preferably, the partition 124 is fixedly connected to the arc-shaped baffle 122 by integral injection molding to ensure the structural stability of the enclosure 12.

[0044] In this embodiment, combined with Figures 1 to 4 As shown, the drive motor 2 also includes a motor housing 23 and a metal shaft core 24, and the cooling fan also includes a fan blade 3. The motor housing 23 is located on the periphery of the stator assembly 21, and the metal shaft core 24 passes through the stator assembly 21 and is connected to the fan blade 3. The fan blade 3 faces the air intake channel 131 located on the upper cover 13. The metal shaft core 24 rotates under the magnetic force of the stator assembly 21, thereby driving the fan blade 3 to rotate in the inner cavity 101, forming a directional airflow, so that high-temperature gas can be drawn into the inner cavity 101 by the fan blade 3 through the air intake channel 131, and then discharged from the inner cavity 101 to the outside of the exhaust channel 102, thereby achieving efficient heat dissipation.

[0045] The following is based on Figure 5 , Figure 6 For example, this section illustrates how to improve the stability of the drive control board 22 at mounting position 121. (Reference) Figure 5 and Figure 6 As shown, a positioning support 125 is provided on each of the opposite side walls of the receiving groove. That is, a positioning support 125 is provided on the inner side wall of the partition 124 and the inner side wall of the arc-shaped baffle 122, and the two positioning supports 125 are spaced apart to form an assembly gap 1251 between the two positioning supports 125. The drive control board 22 can be inserted into the receiving groove through the assembly gap 1251, thereby ensuring that the drive control board 22 cannot swing left or right, improving the installation stability of the drive control board 22 and facilitating subsequent operations.

[0046] Furthermore, the top edge of the positioning support 125 is higher than the top edge of the drive control board 22. In this embodiment, the top edge of the positioning support 125 is about 1.2 mm higher than the top edge of the drive control board 22. The part of the positioning support 125 that is higher than the drive control board 22 can be formed by heat fusion using the heat fusion equipment 100, so that the two arc-shaped fixing parts 1252 can be fixedly connected to form a rounded columnar structure. Through this structure, the drive control board 22 can be firmly fixed in the mounting position 121, avoiding loosening and displacement of the drive control board 22 during operation, and further improving the installation stability of the drive control board 22.

[0047] It should be noted that, in other parallel embodiments, reference is made to... Figure 7As shown, the drive control board 22 can also be fixedly mounted using two snap-fit ​​pieces 126 disposed in the receiving groove. The open ends of the two snap-fit ​​pieces 126 are positioned opposite each other to hold the drive control board 22 within the receiving groove. In specific operation, one snap-fit ​​piece 126 can be fixedly mounted at the bottom of the receiving groove first. After the bottom end of the drive control board 22 is inserted into the snap-fit ​​piece 126, the other snap-fit ​​piece 126 is then inserted into the top end of the drive control board 22. Finally, the other snap-fit ​​piece 126 is fixed within the receiving groove to complete the assembly. This method does not require a heat-fusion process and is simple to install, but it requires high dimensional accuracy of the snap-fit ​​pieces 126. Therefore, those skilled in the art can select the most suitable method for fixing the drive control board 22 according to actual working conditions, and this utility model does not limit this method.

[0048] Optionally, the receiving groove is also filled with a structural adhesive curing protective layer, which is wrapped around the outer peripheral surface of the drive control board 22, effectively isolating the drive control board 22 from the influence of the external environment. In specific operation, it is only necessary to inject waterproof adhesive into the receiving groove, and after the waterproof adhesive solidifies, it can achieve the functions of waterproof, dustproof and salt spray protection. In addition, the traditional protection treatment of the drive control board 22 for cooling fans requires placing the drive control board 22 into a special mold for injection of adhesive, waiting for the waterproof adhesive to solidify, demolding and then assembling it in the fan. However, this embodiment does not require a mold or demolding, which greatly saves time and cost, simplifies the production process, and has a very obvious advantage.

[0049] Specifically, in this embodiment, combined with Figure 2 , Figure 4 , Figure 8 As shown, the stator assembly 21 includes multiple silicon steel sheet groups 211 and multiple enameled wires 212. The multiple silicon steel sheet groups 211 are arranged circumferentially and fixedly disposed in the inner cavity 101. The enameled wires 212 are correspondingly wound around the silicon steel sheet groups 211. The in-phase portions of the multiple enameled wires 212 can be connected in parallel to form multiple in-phase lead-out ends 2121. A first wire-passing hole 111 is provided on the base plate 11, and a second wire-passing hole (not shown in the figure) is provided at the bottom of the receiving groove. The multiple in-phase lead-out ends 2121 pass through the first wire-passing hole 111 and the second wire-passing hole and are soldered to the corresponding pads on the drive control board 22. When the cooling fan is powered on, the stator assembly 21 can generate a magnetic field to drive the metal shaft core 24 to rotate. The metal shaft core 24 controls the fan blades 3 to rotate, thereby achieving the function of forming a directional airflow.

[0050] In the above configuration, the enameled wire 212 extends to the bottom of the base plate 11 through the first wire hole 111 in a downward inclined state to prevent the fan blade 3 from hitting the enameled wire 212 when rotating.

[0051] In this embodiment, as shown in reference 4, the drive motor 2 also includes a plurality of magnets 26. The magnets 26 are disposed on the outer side of the silicon steel sheet assembly 211 and sandwiched between the silicon steel sheet assembly 211 and the motor housing 23. The magnets 26 can enhance the magnetic effect of the stator assembly 21, ensure uniform magnetic field distribution, and thus improve drive efficiency.

[0052] Furthermore, the sector frame 1 provided in this embodiment also includes an insulating adhesive layer (not shown in the figure). The insulating adhesive layer is disposed at the bottom of the base plate 11 and extends horizontally between the first wire through hole 111 and the second wire through hole. The upper and lower surfaces of the insulating adhesive layer are respectively bonded to the base plate 11 and the plurality of in-phase leads 2121, effectively preventing the risk of short circuit between the in-phase leads 2121 and the base plate 11, and ensuring the safety and stability of the circuit. Preferably, in this embodiment, the insulating adhesive layer is made of insulating adhesive paper. Insulating adhesive paper has excellent insulation performance and high temperature resistance, can work stably for a long time, and is not easy to age, thus having a long service life and high safety and stability in use.

[0053] Furthermore, the sector frame 1 provided in this embodiment also includes an adhesive layer (not shown in the figure). The adhesive layer is disposed opposite to the insulating adhesive layer and is adhered to and covers the multiple unidirectional leads, thereby ensuring that the enameled wire 212 is not exposed, avoiding scratches on the enameled wire 212, and further enhancing the safety of the enameled wire 212 in use. Preferably, in this embodiment, the adhesive layer is made of acetate tape, which has good adhesion and flexibility, and can be tightly adhered to the enameled wire 212, providing reliable protection for the enameled wire 212.

[0054] Optionally, in this embodiment, an insulating Mylar 14 is sandwiched between the silicon steel sheet assembly 211 and the base plate 11. The insulating Mylar 14 effectively isolates the silicon steel sheet assembly 211 from the base plate 11, prevents current leakage, improves the overall insulation performance, and thus ensures the safe and reliable operation of the cooling fan.

[0055] Optionally, in this embodiment, the drive control board 22 is provided with a chip package structure. The chip package structure adopts a wafer-level double-sided leadless flat package. The chip package structure has an outer shape of only 3*3mm to match the miniaturization design requirements of the thin DC brushless cooling fan.

[0056] For example, the following is combined with Figures 1 to 8 Taking a DC brushless cooling fan with dimensions of 94.6*77mm, a thickness of 7.8mm, a rated DC voltage of 12V, and a six-slot, four-pole drive motor as an example, the assembly process and working principle of this DC brushless cooling fan will be further explained:

[0057] A metal central tube 15 is fixed to the inner side of the base plate 11 by injection molding. A rotating bearing 16 is installed inside the metal central tube 15. The arc-shaped baffle 122, the partition 124 and the support block 123 are all made of plastic. The receiving groove formed between the partition 124 and the arc-shaped baffle 122 is equipped with a drive control plate 22. When the drive control plate 22 is fully inserted into place, the parts of the two positioning pillars 125 that extend beyond the top edge of the drive control plate 22 will bend towards each other under the action of the hot melt equipment 100 to form an arc-shaped fixing part 1252. The two arc-shaped fixing parts 1252 are fused and fixedly connected to form a rounded columnar structure, thereby fixing the drive control plate 22 in the mounting position 121.

[0058] In addition, in this embodiment, the magnet 26 has a height of 4.85mm and is bonded together with the motor housing 23 inside the hub of the fan blade 3. Each silicon steel sheet assembly 211 includes 11 silicon steel sheets stacked together with a thickness of 0.35mm. After the silicon steel sheets are coated with insulation, enameled wire 212 is directly wound on the silicon steel sheets. The wound silicon steel sheet assembly 211 is directly sleeved on the outer surface of the metal tube 15, and the connection between the metal tube 15 and the silicon steel sheet assembly 211 is fixed with glue to ensure the stability of the silicon steel sheet assembly 211.

[0059] Furthermore, in this embodiment, the enameled wire 212 is connected to the drive control board 22 in a three-phase Y-type configuration, forming three in-phase leads 2121 (U, V, and W) on the enameled wire 212. All three in-phase leads 2121 pass through the first wire-passing hole 111 on the base plate 11, and then extend into the receiving groove through the second wire-passing hole, ensuring that all three in-phase leads 2121 can be effectively soldered to the corresponding pads on the drive control board 22. The drive control board 22 also has soldering points for soldering with the leads 25, enabling the drive control board 22 to achieve a stable connection with the power supply equipment via the leads 25. Finally, the top cover 13 is sealed to the top opening of the inner cavity 101 using a detachable and fixed connection such as a threaded connection or snap-fit, to protect the drive motor 2 inside the inner cavity 101. After the above-mentioned brushless DC cooling fan is assembled, the DC power supply is turned on, and the speed is measured to be 6523 RPM and the current is 0.502A at the rated voltage of 12V.

[0060] In summary, if the traditional implementation method is adopted, i.e., if the drive control board 22 is mounted at the bottom of the stator assembly 21, the fan blade 3 speed can only reach 4636 RPM and the operating current is 0.502A due to derating. This speed is too low to meet the user's cooling requirements. However, with the DC brushless cooling fan provided in this embodiment, since the drive control board 22 is no longer installed at the bottom of the stator assembly 21, the design space at the bottom of the stator assembly 21 is increased. The vertical length of the magnet 26 can be increased from 3.8mm to 4.85mm, the number of silicon steel sheets in each silicon steel sheet group 211 can be increased from 8 to 11, and the number of winding layers of enameled wire 212 on each silicon steel sheet group 211 is also increased, thereby increasing the speed of the fan blade 3 and effectively improving the heat dissipation performance of the cooling fan.

[0061] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A DC brushless cooling fan, characterized in that, include: The fan frame (1) includes a base plate (11) and a baffle plate (12). The baffle plate (12) extends outward from the outer periphery of the base plate (11) and forms an inner cavity (101). The baffle plate (12) is provided with a mounting position (121). The drive motor (2) includes a stator assembly (21) and a drive control board (22). The stator assembly (21) is disposed in the inner cavity (101), and the drive control board (22) is electrically connected to the stator assembly (21) and disposed on the mounting position (121).

2. The DC brushless cooling fan according to claim 1, characterized in that, The enclosure plate (12) is provided with a receiving groove, the top of the receiving groove has an open end, the space inside the receiving groove forms the mounting position (121), and the drive control plate (22) can be inserted into the receiving groove through the open end.

3. The DC brushless cooling fan according to claim 2, characterized in that, In the opposite side walls of the receiving groove, each side wall is provided with a positioning support (125), and the two positioning supports (125) of the two side walls are spaced apart, defining an assembly gap (1251) between the two positioning supports (125). The drive control board (22) is inserted into the receiving groove through the assembly gap (1251); or, The receiving groove is provided with two buckle members (126) with their open ends facing each other, and the two ends of the drive control board (22) are respectively inserted into the corresponding buckle members (126).

4. The DC brushless cooling fan according to claim 3, characterized in that, The top edge of the positioning post (125) is higher than the top edge of the drive control plate (22), and the part of the positioning post (125) higher than the drive control plate (22) can be formed by hot melting to form an arc-shaped fixing part (1252) that bends toward the opposite positioning post (125), so that the two arc-shaped fixing parts (1252) can be fixedly connected and the drive control plate (22) is limited and set in the receiving groove.

5. The DC brushless cooling fan according to claim 2, characterized in that, The receiving groove is also filled with a structural adhesive curing protective layer, which is wrapped around the outer periphery of the drive control board (22).

6. The DC brushless cooling fan according to claim 2, characterized in that, The stator assembly (21) includes multiple silicon steel sheet groups (211) and multiple enameled wires (212). The multiple silicon steel sheet groups (211) are arranged in a circumferential direction and fixedly disposed in the inner cavity (101). The enameled wires (212) are corresponding one to one and wound around the silicon steel sheet groups (211). The same phase portions of the multiple enameled wires (212) can be connected in parallel to form multiple same phase lead-out terminals (2121). The base plate (11) is provided with a first wire hole (111), the bottom of the receiving groove is provided with a second wire hole, and a plurality of the same phase lead-out ends (2121) pass through the first wire hole (111) and the second wire hole and are connected to the drive control board (22).

7. The DC brushless cooling fan according to claim 6, characterized in that, The fan frame (1) also includes an insulating adhesive layer, which is disposed at the bottom of the base plate (11) and extends horizontally between the first wire hole (111) and the second wire hole. The upper and lower surfaces of the insulating adhesive layer are respectively bonded to the base plate (11) and the plurality of in-phase lead-out terminals (2121).

8. The DC brushless cooling fan according to claim 7, characterized in that, The sector frame (1) further includes an adhesive layer, which is disposed opposite to the insulating adhesive layer and is attached to and covers the plurality of in-phase leads (2121).

9. The DC brushless cooling fan according to claim 6, characterized in that, The base plate (11) is a metal plate, and an insulating Mylar (14) is sandwiched between the silicon steel sheet group (211) and the base plate (11).

10. The DC brushless cooling fan according to any one of claims 1-9, characterized in that, The drive control board (22) is provided with a chip packaging structure, which is a wafer-level double-sided leadless flat package.

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