A miniaturized brushless DC fan for automobiles

Abstract

The present invention provides a miniaturized brushless DC fan for automobiles, comprising a frame assembly and an impeller mechanism, wherein the frame assembly comprises a fan mesh cover, a main housing, and an end cover; wherein the end cover is mounted on one side of the main housing, the main housing is mounted on one side of an inner side wall of the fan mesh cover, a brushless drive mechanism is mounted on one side of the inner side wall of the main housing, and a PCBA board is mounted on one side of the inner side wall of the end cover via bolts; the present invention utilizes a quick-connect mechanism to quickly connect the brushless drive mechanism and the PCBA board, and the PCBA board and the end cover, so that when the PCBA and its circuits are damaged, the PCBA board and the end cover can be directly removed from the brushless drive mechanism as a whole by moving the end cover in conjunction with the quick-connect mechanism for inspection and maintenance, or the PCBA board can be separated from the end cover by moving the PCBA board in conjunction with the quick-connect mechanism, so that the PCBA board can be removed separately for inspection or replacement, thereby making the brushless DC fan more convenient for disassembly, assembly, and maintenance operations, and saving the cost of PCBA replacement.

Description

Technical Field

[0001] The present invention relates to a brushless DC fan, in particular to a miniaturized brushless DC fan for automobiles, belonging to the technical field of fans. Background Art

[0002] A DC fan is one that converts DC power into mechanical energy by rotating a DC motor through an input DC power source. Currently, automotive DC fans mostly use miniaturized brushless DC fans. These eliminate the need for excitation collector rings and brushes, significantly simplifying their structure. This not only improves the fan's manufacturability but also significantly enhances its mechanical reliability and lifespan.

[0003] The current announcement number CN116753181A discloses a plug-in waterproof fan, which includes a fan base frame, a motor and impeller assembly assembled on one side of the fan base frame, and a PCB assembly detachably assembled on the other side of the fan base frame; the PCB assembly includes a base, a PCBA encapsulated in the base by a glue layer, and a female socket protruding from the glue layer from the PCBA terminal; the motor includes a terminal and a wiring assembly connected to the terminal and penetrating the fan base frame, and the wiring assembly is pluggable and connected to the female socket.

[0004] However, although the fan has high waterproof performance and the PCB assembly can be easily disassembled and replaced from the fan, its PCBA is directly encapsulated inside the base through a glue layer. As a result, once the PCBA and its circuits are damaged, the base and the PCBA inside need to be replaced as a whole. Not only is maintenance impossible, but the replacement cost is also high. In addition, the blade structure design is not reasonable, resulting in excessive noise during fan operation. Therefore, a miniaturized brushless DC fan for automobiles is proposed. Summary of the Invention

[0005] In view of this, the present invention provides a miniaturized brushless DC fan for automobiles to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial choice.

[0006] The technical solution of the embodiment of the present invention is achieved as follows: A miniaturized brushless DC fan for automobiles includes a frame assembly and an impeller mechanism, wherein the frame assembly includes a fan mesh cover, a main housing and an end cover;

[0007] The end cover is mounted on one side of the main housing, the main housing is mounted on one side of the inner wall of the fan grille, a brushless drive mechanism is mounted on one side of the inner wall of the main housing, a PCBA board is mounted on one side of the inner wall of the end cover by bolts, the impeller mechanism is mounted on one side of the brushless drive mechanism, and a quick connection mechanism is installed between the brushless drive mechanism and the PCBA board, and between the PCBA board and the end cover;

[0008] The impeller mechanism improves the efficiency of the brushless DC fan and reduces noise by adding a frame.

[0009] The brushless drive mechanism is used to drive the impeller mechanism to rotate, and adopts a nine-slot six-pole design for concentrated winding;

[0010] The quick-connect mechanism is used to quickly assemble the brushless drive mechanism and the PCBA board, and the PCBA board and the end cover. The quick-connect mechanism includes a connecting plate frame, three first PIN inserts, three first socket ears, a plurality of second PIN inserts, and a plurality of second socket ears.

[0011] In which, the connecting plate frame is installed on one side of the brushless drive mechanism, the three first PIN plugs are fixedly connected to the inner side wall of the connecting plate frame, the three first socket ears are fixedly connected to one side of the PCBA board, the outer side wall of the first PIN plug is slidably connected to the inner side wall of the first socket ear, several second PIN plugs are installed on one side of the PCBA board, several second socket ears are arranged on one side of the end cover, and the outer side wall of the second PIN plug is slidably connected to the inner side wall of the second socket ear.

[0012] Further preferably, the impeller mechanism includes a fan blade frame, a plurality of blades, an inner cylinder and a plurality of V-shaped guide grooves;

[0013] Among them, the inner cylinder is arranged inside the fan blade frame, several of the blades are fixedly connected between the fan blade frame and the inner cylinder, several of the V-shaped guide grooves are opened on one side of the inner cylinder, and the fan blade frame, blades, inner cylinder and V-shaped guide groove are an integrated structure.

[0014] Further preferably, the brushless drive mechanism includes a stator core, a first insulating frame, a second insulating frame, nine enameled coils, a rotor core, six magnetic steel sheets, a main shaft and a wind wheel;

[0015] In which, the stator core is installed on one side of the inner wall of the main housing, the first insulating frame is slidably connected to one side of the inner wall of the stator core, and the second insulating frame is slidably connected to the other side of the inner wall of the stator core. The nine enameled coils are all wound around the inner walls of the first insulating frame and the second insulating frame. The connecting plate frame is fixedly connected to one side of the first insulating frame by screws, and one end of the nine enameled coils is electrically connected to one end of the three first PIN plugs through wires.

[0016] Further preferably, the rotor core is arranged in the middle of the inner wall of the stator core, the six magnetic steel sheets are all inserted into the inner wall of the rotor core, the wind wheel is fixedly connected to one side of the rotor core, the outer wall of the main shaft is fixedly connected to the inner wall of the wind wheel, and the middle of the inner wall of the inner cylinder is fixedly connected to one end of the wind wheel.

[0017] Further preferably, the quick-connect mechanism further includes a card block and a plurality of card slots;

[0018] The card block is fixedly connected to a side of the PCBA board away from the first socket ear, and a plurality of card slots are opened on one side of the connecting plate frame, and the outer side wall of the card block is plugged into the inner side wall of the card slot.

[0019] Further preferably, a wiring harness assembly is provided on one side of the fan grille, one end of the wiring harness assembly is connected to a junction plate, several of the second socket ears are fixedly connected to one side of the junction plate, and the junction plate is fixedly connected to one side of the end cover.

[0020] Further preferably, a cable tie groove is provided on one side of the fan grille, and a cable outlet cover is installed on one side of the branching plate.

[0021] Further preferably, a wire outlet pad is fixedly connected to one side of the inner side wall of the end cover, the outer side wall of the second PIN plug is slidably connected to the inner side wall of the wire outlet pad, and an O-ring is slidably connected to one side of the inner side wall of the main housing.

[0022] Further preferably, a waterproof bearing is installed in the middle of the inner wall of the main housing, and the outer wall of the main shaft is rotatably connected to the inner wall of the main housing through the waterproof bearing. A tail end bearing is installed in the middle of the inner wall of the end cover, and one end of the main shaft is rotatably connected to the inner wall of the end cover through the tail end bearing.

[0023] Further preferably, a gasket is provided on the outer wall of the main shaft, and the gasket is located between the waterproof bearing and the rotor core.

[0024] The embodiment of the present invention adopts the above technical solution, which has the following advantages:

[0025] The present invention utilizes a quick-connect mechanism to quickly connect the brushless drive mechanism and the PCBA, and the PCBA and the end cover. When the PCBA and its circuits are damaged, the PCBA and the end cover can be directly removed from the brushless drive mechanism by moving the end cover in conjunction with the quick-connect mechanism for maintenance. Alternatively, the PCBA can be separated from the end cover by moving the PCBA in conjunction with the quick-connect mechanism, so that the PCBA can be removed and repaired separately. This makes the brushless DC fan easier to disassemble and repair, and saves the cost of replacing the PCBA.

[0026] The present invention uses an impeller mechanism to add a frame to the traditional blades to reduce the gap between the blades and the main casing, and reduce the cutting effect of the blades on the air. It can effectively reduce the noise generated during the operation of the brushless DC fan, reduce aerodynamic resistance, improve work efficiency, reduce the wear of the blades, and extend the service life of the brushless DC fan.

[0027] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 It is a structural diagram of the present invention;

[0030] Figure 2 It is a schematic cross-sectional view of the present invention;

[0031] Figure 3 It is an explosion diagram of the present invention;

[0032] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of area A;

[0033] Figure 5 Schematic diagram of the internal structure of the main housing of the present invention;

[0034] Figure 6 This is an axonometric view of the wind wheel of the present invention;

[0035] Figure 7 is an isometric view of the first insulating frame of the present invention;

[0036] Figure 8 is an isometric view of the stator core of the present invention;

[0037] Figure 9 It is a side structural schematic diagram of the present invention.

[0038] Reference numerals: 1, frame assembly; 2, impeller mechanism; 3, brushless drive mechanism; 4, PCBA board; 5, quick-connect mechanism; 101, fan mesh cover; 102, main housing; 103, end cover; 201, fan blade frame; 202, blade; 203, inner cylinder; 204, V-shaped guide groove; 301, stator core; 302, first insulating frame; 303, second insulating frame; 304, enameled coil; 305, rotor core; 306, rotor core; 307, rotor core; 308, rotor core; 309, rotor core; 310, rotor core; 311, rotor core; 312, rotor core; 313, rotor core; 314, rotor core; 315, rotor core; 316, rotor core; 317, rotor core; 318, rotor core; 319, rotor core; 320, rotor core; 321, rotor core; 322, rotor core; 323, rotor core; 324, rotor core; 325, rotor core; 326, rotor core; 327, rotor core; 328, rotor core; 329, rotor core; 330, rotor core; 331, rotor core; 332, rotor core; 333, rotor core; 334, rotor core; 335, rotor core; 336, rotor core; 337, rotor core; 338, rotor core; 339, rotor core; 340, rotor core; 341, rotor core; 342, rotor core; 343, rotor core; 344, rotor core; 345, rotor core; 346, rotor core; 347, rotor core; 348, rotor core; 349, rotor core 6. Magnetic steel sheet; 307. Main shaft; 308. Wind wheel; 501. Connecting plate frame; 502. First PIN insert; 503. Card block; 504. Card slot; 505. First socket ear; 506. Second PIN insert; 507. Second socket ear; 61. Wiring assembly; 62. Wiring trough; 63. Wire outlet cover; 64. Wire outlet pad; 65. O-ring; 66. Waterproof bearing; 67. Tail end bearing; 68. Gasket; 69. Distribution board. DETAILED DESCRIPTION

[0039] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0040] It should be noted that the terms "first," "second," "symmetrical," and "array" are used solely for descriptive and positional purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, limitations on features such as "first" and "symmetrical" may explicitly or implicitly include one or more of these features. Similarly, when features are not limited in quantity using words such as "two" or "three," it should be noted that these features also explicitly or implicitly include one or more of these features.

[0041] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] like Figures 1-9 As shown, an embodiment of the present invention provides a miniaturized brushless DC fan for automobiles, comprising a frame assembly 1 and an impeller mechanism 2. The frame assembly 1 comprises a fan grille 101, a main housing 102 and an end cover 103.

[0043] The end cover 103 is mounted on one side of the main housing 102, the main housing 102 is mounted on one side of the inner wall of the fan mesh cover 101, a brushless drive mechanism 3 is mounted on one side of the inner wall of the main housing 102, a PCBA board 4 is mounted on one side of the inner wall of the end cover 103 by bolts, the impeller mechanism 2 is mounted on one side of the brushless drive mechanism 3, and a quick connection mechanism 5 is installed between the brushless drive mechanism 3 and the PCBA board 4, and between the PCBA board 4 and the end cover 103;

[0044] Among them, the impeller mechanism 2 uses the method of increasing the frame to improve the efficiency of the brushless DC fan and reduce the noise;

[0045] Among them, the brushless drive mechanism 3 is used to drive the impeller mechanism 2 to rotate, and adopts a nine-slot six-pole design for concentrated winding;

[0046] The quick-connect mechanism 5 is used to quickly assemble the brushless drive mechanism 3 and the PCBA board 4, and the PCBA board 4 and the end cover 103. The quick-connect mechanism 5 includes a connecting plate frame 501, three first PIN inserts 502, three first socket ears 505, a plurality of second PIN inserts 506, and a plurality of second socket ears 507.

[0047] Among them, the connecting plate frame 501 is installed on one side of the brushless drive mechanism 3, the three first PIN plugs 502 are fixedly connected to the inner wall of the connecting plate frame 501, the three first socket ears 505 are fixedly connected to one side of the PCBA board 4, the outer wall of the first PIN plug 502 is slidably connected to the inner wall of the first socket ear 505, several second PIN plugs 506 are installed on one side of the PCBA board 4, and several second socket ears 507 are arranged on one side of the end cover 103, and the outer wall of the second PIN plug 506 is slidably connected to the inner wall of the second socket ear 507.

[0048] In one embodiment, the impeller mechanism 2 includes a blade frame 201, a plurality of blades 202, an inner cylinder 203 and a plurality of V-shaped guide grooves 204;

[0049] Among them, the inner cylinder 203 is arranged inside the fan blade frame 201, and several blades 202 are fixedly connected between the fan blade frame 201 and the inner cylinder 203. Several V-shaped guide grooves 204 are opened on one side of the inner cylinder 203. The fan blade frame 201, blades 202, inner cylinder 203 and V-shaped guide grooves 204 are an integrated structure.

[0050] The fan blade frame 201 is set to reduce the gap between the blade 202 and the main housing 102, and can reduce the cutting effect of the blade 202 on the air, effectively reducing the noise generated during the operation of the brushless DC fan, reducing aerodynamic resistance, improving work efficiency, and reducing the wear and tear of the blade 202 during operation, thereby extending the service life of the blade 202.

[0051] In one embodiment, the brushless drive mechanism 3 includes a stator core 301, a first insulating frame 302, a second insulating frame 303, nine enameled coils 304, a rotor core 305, six magnetic steel sheets 306, a main shaft 307 and a wind wheel 308;

[0052] Among them, the stator core 301 is installed on one side of the inner wall of the main housing 102, the first insulating frame 302 is slidably connected to one side of the inner wall of the stator core 301, and the second insulating frame 303 is slidably connected to the other side of the inner wall of the stator core 301. The nine enameled coils 304 are all wound around the inner walls of the first insulating frame 302 and the second insulating frame 303. The connecting plate frame 501 is fixedly connected to one side of the first insulating frame 302 by screws. One end of the nine enameled coils 304 is electrically connected to one end of the three first PIN plugs 502 through wires. The rotor core 305 is arranged in the middle of the inner wall of the stator core 301, and the six magnetic steel sheets 306 are all plugged into the rotor core. The inner wall of the core 305, the wind wheel 308 is fixedly connected to one side of the rotor core 305, the outer wall of the main shaft 307 is fixedly connected to the inner wall of the wind wheel 308, the middle part of the inner wall of the inner cylinder 203 is fixedly connected to one end of the wind wheel 308, a waterproof bearing 66 is installed in the middle part of the inner wall of the main casing 102, the outer wall of the main shaft 307 is rotatably connected to the inner wall of the main casing 102 through the waterproof bearing 66, a tail end bearing 67 is installed in the middle part of the inner wall of the end cover 103, one end of the main shaft 307 is rotatably connected to the inner wall of the end cover 103 through the tail end bearing 67, the outer wall of the main shaft 307 is sleeved with a gasket 68, and the gasket 68 is located between the waterproof bearing 66 and the rotor core 305.

[0053] The PCBA board 4 uses the first socket ear 505 and the first PIN insert 502 to control the activation of the enameled coil 304 wound on the stator core 301, the first insulating frame 302, and the second insulating frame 303, so that a magnetic field is generated between the stator core 301 and the rotor core 305. The magnetic field then interacts with the magnetic steel sheet 306 to generate a torque, driving the rotor core 305 to rotate the wind wheel 308 and the main shaft 307. The rotating main shaft 307 uses the inner cylinder 203 to drive the fan blade frame 201 and the blades 202 to rotate. The waterproof bearing 66 is used to provide good sealing between the main shaft 307 and the main housing 102, preventing moisture from entering the interior of the main housing 102 and interfering with the operation of the brushless drive mechanism 3 and the PCBA board 4.

[0054] In one embodiment, the quick-connect mechanism 5 further includes a clamping block 503 and a plurality of clamping slots 504;

[0055] Among them, the card block 503 is fixedly connected to the side of the PCBA board 4 away from the first socket ear 505, and several card slots 504 are all opened on one side of the connecting plate frame 501. The outer wall of the card block 503 is inserted into the inner wall of the card slot 504. One side of the inner wall of the end cover 103 is fixedly connected to the outlet pad 64, the outer wall of the second PIN plug 506 is slidably connected to the inner wall of the outlet pad 64, and one side of the inner wall of the main housing 102 is slidably connected to the O-ring 65.

[0056] The card block 503 and the card slot 504 are used to position and limit the PCBA board 4 and the connecting plate frame 501; the wire outlet pad 64 is used to improve the sealing between the end cover 103 and the second PIN plug 506, and the O-ring 65 is used to improve the sealing of the connection between the main housing 102 and the end cover 103.

[0057] In one embodiment, a wiring harness assembly 61 is provided on one side of the fan mesh cover 101, one end of the wiring harness assembly 61 is connected to a junction plate 69, a plurality of second socket ears 507 are fixedly connected to one side of the junction plate 69, the junction plate 69 is fixedly connected to one side of the end cover 103, a wiring groove 62 is opened on one side of the fan mesh cover 101, and a wire outlet cover 63 is installed on one side of the junction plate 69.

[0058] The outlet cover 63 is used to seal the space between the distribution board 69 and the end cover 103 to prevent moisture from entering and corroding the second socket ear 507 and the second PIN plug 506 . The harness groove 62 is used to limit the wiring harness on the end cover 103 .

[0059] In one embodiment, the characteristic parameters of the brushless DC fan of the present invention are as follows:

[0060] Working voltage: DC 16-32V;

[0061] Maximum speed: 4000 ±100 rpm;

[0062] Maximum noise: ≤75 decibels;

[0063] Working temperature: -40-120℃;

[0064] Lifespan: ≥40,000 hours;

[0065] Maximum current: ≤7A;

[0066] Protection grade: IP68;

[0067] CFM control mode: PWM (Pulse Width Modulation);

[0068] Electromagnetic compatibility level: ISO 16750-22012;

[0069] Working frequency: 50-1000 HZ (Hertz);

[0070] Power: 200W;

[0071] The performance parameter test is shown in Table 1 below (the experimental voltage is 26V):

[0072] .

[0073] In one embodiment, the brushless DC fan of the present invention can be used not only for heat dissipation of automobile engines, but also for rail transportation thermal management, refrigeration, etc.

[0074] When the present invention is working: first, the brushless DC fan is installed to the specified position, and the wiring operation is completed through the set wiring harness assembly 61, so that the second socket ear 507 and the second PIN plug 506 are used through the wiring harness assembly 61 to communicate and power the PCBA board 4.

[0075] When the brushless DC fan needs to be started, the PCBA board 4 controls the activation of the stator core 301, the first insulating frame 302 and the enameled coil 304 wound on the second insulating frame 303 using the first socket ear 505 and the first PIN insert 502 according to the received instruction, so that a magnetic field is generated between the stator core 301 and the rotor core 305. Then, the magnetic field interacts with the magnetic steel sheet 306 to generate a torque, driving the rotor core 305 to drive the wind wheel 308 and the main shaft 307 to rotate. The rotating main shaft 307 uses the inner cylinder 203 to drive the fan blade frame 201 and the blades 202 to rotate, so as to drive the brushless DC fan to work. The brushless drive mechanism 3 adopts a nine-slot six-pole design for concentrated winding, which optimizes the magnetic circuit and current path, can effectively improve the operating efficiency of the brushless DC fan, and the six-pole design helps to provide a smooth torque characteristic for the rotor core 305 and reduce the vibration generated during the operation of the brushless DC fan.

[0076] The fan blade frame 201 is provided to reduce the gap between the blades 202 and the main housing 102, and can reduce the cutting effect of the blades 202 on the air, effectively reducing the noise generated during the operation of the brushless DC fan, reducing aerodynamic resistance, improving work efficiency, and reducing the wear and tear on the blades 202 during operation, thereby extending the service life of the blades 202. The V-shaped guide groove 204 is provided to cooperate with the inner cylinder 203 for drainage, preventing liquid from staying in the inner cylinder 203 for a long time; the waterproof bearing 66 is provided to provide good sealing between the main shaft 307 and the main housing 102, preventing water vapor from entering the interior of the main housing 102 and interfering with the operation of the brushless drive mechanism 3 and the PCBA board 4; the outlet pad 64 is provided to improve the sealing between the end cover 103 and the second PIN plug 506.

[0077] When the brushless DC fan fails or is damaged and the PCBA board 4 needs to be repaired or replaced, the fan mesh cover 101 is first removed from the main housing 102, and then the end cover 103 is moved to drive the PCBA board 4 to move. The moving PCBA board 4 drives the card block 503 and the first socket ear 505 to move. The moving card block 503 slides out of the card slot 504, and the moving first socket ear 505 is separated from the first PIN insert 502, so that the PCBA board 4 can be removed from the brushless drive mechanism 3 for inspection. The card block 503 and the card slot 504 are provided to position and limit the PCBA board 4 and the connecting plate frame 501. When the PCBA board 4 needs to be removed from the end cover 103 for further inspection or replacement, the bolts between the end cover 103 and the PCBA board 4 are removed, and then the PCBA board 4 is moved to drive the second PIN insert 506 to slide out from the second socket ear 507, thereby completing the removal operation of the PCBA board 4. This makes the brushless DC fan easier to disassemble and repair, and the PCBA board 4 can be replaced separately, saving replacement costs.

[0078] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A miniaturized brushless DC fan for automobiles, comprising a frame assembly (1) and an impeller mechanism (2), characterized in that: The frame assembly (1) includes a fan screen (101), a main housing (102) and an end cover (103); The end cover (103) is mounted on one side of the main housing (102), the main housing (102) is mounted on one side of the inner wall of the fan grille (101), a brushless drive mechanism (3) is mounted on one side of the inner wall of the main housing (102), a PCBA board (4) is mounted on one side of the inner wall of the end cover (103) via bolts, the impeller mechanism (2) is mounted on one side of the brushless drive mechanism (3), and a quick-connect mechanism (5) is mounted between the brushless drive mechanism (3) and the PCBA board (4), and between the PCBA board (4) and the end cover (103); The impeller mechanism (2) improves the efficiency of the brushless DC fan and reduces noise by increasing the frame; The brushless drive mechanism (3) is used to drive the impeller mechanism (2) to rotate, and adopts a nine-slot six-pole design for concentrated winding; The quick-connect mechanism (5) is used for quickly assembling the brushless drive mechanism (3) and the PCBA board (4), and the PCBA board (4) and the end cover (103). The quick-connect mechanism (5) comprises a connecting plate frame (501), three first PIN inserts (502), three first socket ears (505), a plurality of second PIN inserts (506), and a plurality of second socket ears (507). The connecting plate frame (501) is installed on one side of the brushless drive mechanism (3), the three first PIN inserts (502) are fixedly connected to the inner side wall of the connecting plate frame (501), the three first socket ears (505) are fixedly connected to one side of the PCBA board (4), the outer side wall of the first PIN insert (502) is slidably connected to the inner side wall of the first socket ear (505), a plurality of second PIN inserts (506) are installed on one side of the PCBA board (4), a plurality of second socket ears (507) are provided on one side of the end cover (103), and the outer side wall of the second PIN insert (506) is slidably connected to the inner side wall of the second socket ear (507); The impeller mechanism (2) comprises a fan blade frame (201), a plurality of blades (202), an inner cylinder (203) and a plurality of V-shaped guide grooves (204); The inner cylinder (203) is arranged inside the fan blade frame (201), the plurality of blades (202) are fixedly connected between the fan blade frame (201) and the inner cylinder (203), the plurality of V-shaped guide grooves (204) are opened on one side of the inner cylinder (203), and the fan blade frame (201), the blades (202), the inner cylinder (203) and the V-shaped guide grooves (204) are an integrated structure.

2. The miniaturized brushless DC fan for automobiles according to claim 1, characterized in that: The brushless drive mechanism (3) comprises a stator core (301), a first insulating frame (302), a second insulating frame (303), nine enameled coils (304), a rotor core (305), six magnetic steel sheets (306), a main shaft (307) and a wind wheel (308); The stator core (301) is mounted on one side of the inner wall of the main housing (102), the first insulating frame (302) is slidably connected to one side of the inner wall of the stator core (301), the second insulating frame (303) is slidably connected to the other side of the inner wall of the stator core (301), the nine enameled coils (304) are all wound around the inner walls of the first insulating frame (302) and the second insulating frame (303), the connecting plate frame (501) is fixedly connected to one side of the first insulating frame (302) by screws, and one end of the nine enameled coils (304) is electrically connected to one end of the three first PIN plugs (502) by wires.

3. The miniaturized brushless DC fan for automobiles according to claim 2, characterized in that: The rotor core (305) is arranged at the middle of the inner side wall of the stator core (301), the six magnetic steel sheets (306) are all plugged into the inner side wall of the rotor core (305), the wind wheel (308) is fixedly connected to one side of the rotor core (305), the outer side wall of the main shaft (307) is fixedly connected to the inner side wall of the wind wheel (308), and the middle of the inner side wall of the inner cylinder (203) is fixedly connected to one end of the wind wheel (308).

4. The miniaturized brushless DC blower for automobiles according to claim 1, characterized in that: The quick-connect mechanism (5) further includes a clamping block (503) and a plurality of clamping slots (504); The card block (503) is fixedly connected to a side of the PCBA board (4) away from the first socket ear (505), a plurality of the card slots (504) are opened on one side of the connecting plate frame (501), and the outer side wall of the card block (503) is plugged into the inner side wall of the card slot (504).

5. The miniaturized brushless DC blower for automobiles according to claim 1, characterized in that: A wiring harness assembly (61) is provided on one side of the fan mesh cover (101), one end of the wiring harness assembly (61) is connected to a branching plate (69), a plurality of the second socket ears (507) are fixedly connected to one side of the branching plate (69), and the branching plate (69) is fixedly connected to one side of the end cover (103).

6. The miniaturized brushless DC blower for automobiles according to claim 5, characterized in that: A cable duct (62) is provided on one side of the fan mesh cover (101), and a cable outlet cover (63) is installed on one side of the branching plate (69).

7. The miniaturized brushless DC blower for automobiles according to claim 1, characterized in that: An outlet pad (64) is fixedly connected to one side of the inner side wall of the end cover (103), an outer side wall of the second PIN insert (506) is slidably connected to the inner side wall of the outlet pad (64), and an O-ring (65) is slidably connected to one side of the inner side wall of the main housing (102).

8. The miniaturized brushless DC fan for automobiles according to claim 2, characterized in that: A waterproof bearing (66) is installed in the middle of the inner wall of the main housing (102), and the outer wall of the main shaft (307) is rotatably connected to the inner wall of the main housing (102) through the waterproof bearing (66). A tail end bearing (67) is installed in the middle of the inner wall of the end cover (103), and one end of the main shaft (307) is rotatably connected to the inner wall of the end cover (103) through the tail end bearing (67).

9. The miniaturized brushless DC fan for automobiles according to claim 8, characterized in that: A gasket (68) is sleeved on the outer wall of the main shaft (307), and the gasket (68) is located between the waterproof bearing (66) and the rotor core (305).

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