Integrated miniature fan

Abstract

The utility model discloses an integrated miniature fan which is characterized in that a PCB (Printed Circuit Board) assembly is processed by using SMT (Surface Mount Technology), and a bonding pad is reserved; a middle tube is inserted from a through hole in the middle of the PCB assembly, and the circumference of the inner side of the joint of the PCB assembly and the middle tube is bonded and fixed through circle drawing dispensing glue; the transmission assembly is adaptively installed on the middle pipe to be fixed, the periphery of the transmission assembly is wound and wrapped with the covered wire, and then the covered wire is welded to the bonding pad through tin soldering; the fan blade group and the output end of the transmission assembly are fixedly mounted, so that the fan blade group can smoothly rotate in the shell without touching the inner wall of the shell; and glue is injected along a glue groove in the bottom of the shell, the positioning columns are pressed into the positioning holes in the assembled PCB assembly, and assembling of the miniature fan is completed. According to the miniature fan, the hollow space in the outer shell is enlarged, airflow is not blocked when the fan blade set rotates, due to the fact that a bottom plate is omitted, the gap between the PCB assembly and the outer shell is enlarged, the risk of the assembling technology is synchronously reduced, more inner space of the miniature fan is saved, and meanwhile the performance of the miniature fan can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation fans, in particular to an integrated micro fan. Background Art

[0002] Traditional micro fans are designed and assembled separately from the PCB and baseplate. This requires an assembly gap between the PCB and baseplate, and also between the PCB and the fan rotor. This blocks the airflow while the fan is running, increasing fan noise and making it inconvenient to use. Utility Model Content

[0003] In order to solve the above technical problems, the present utility model provides an integrated micro fan, which is characterized in that: the micro fan includes a PCB assembly, an outer shell, a middle tube, a transmission assembly, a fan blade group, a wire wrap and a soldering pad, a positioning hole is provided on the edge of the PCB assembly, a positioning column is provided on the outer shell, and the positioning hole is fixedly connected to the positioning column; a through hole is opened in the middle of the PCB assembly, a middle tube is passed through the through hole, and a transmission assembly is provided on the middle tube, the output end of the transmission assembly is transmission-connected to the fan blade group, the upper end of the fan blade group is slightly lower than the upper end of the outer shell, and the lower end of the fan blade group does not contact the PCB assembly; the outer periphery of the transmission assembly is covered with a wire wrap, the wire wrap is fixedly connected to the soldering pad, and the soldering pad is provided on the PCB assembly.

[0004] Preferably, the PCB assembly includes a PCB board, a control chip, a resistor, a capacitor and a PCB circuit diagram. The PCB board is provided with a PCB circuit diagram, the control chip is attached to the PCB circuit diagram, and the output end of the control chip is electrically connected to the resistor and capacitor respectively through the PCB circuit diagram; a solder pad is provided in the middle of the PCB circuit diagram.

[0005] Preferably, the thickness of the micro fan is 3 mm to 6 mm.

[0006] Preferably, the transmission assembly includes a motor, a bearing and a pressure ring. A first ring groove is provided on the middle tube, and a motor is interference-mounted on the first ring groove. A bearing is provided in the middle of the output end of the motor, and the outer wall of the bearing fits with the inner wall of the middle tube. The upper end of the bearing is adapted to be connected to the motor through a pressure ring, and the top of the output end of the motor is fixedly connected to the fan blade group.

[0007] Preferably, the bottom of the shell is provided with an irregular glue groove along the edge, and a positioning column is provided in the glue groove.

[0008] Preferably, positioning holes are provided at three vertices of the PCB board, and the positioning holes can be fixedly engaged with the positioning posts.

[0009] Preferably, a circular through groove is provided on the top of the shell, and the width of the through groove is smaller than the width of the fan blade assembly.

[0010] Preferably, a second annular groove is provided at the lower portion of the middle tube, the lower end of the second annular groove is flush with the upper end of the PCB board, and glue is filled between the second annular groove and the PCB board.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) The utility model processes the PCB assembly by using SMT patches first, and reserves the soldering pad; inserts the middle tube from the middle through hole of the PCB assembly, and glues the inner circumference of the connection between the PCB assembly and the middle tube with glue; fits the transmission assembly on the middle tube, wraps the wrapped wire around the outer circumference of the transmission assembly, and then solders the wrapped wire to the soldering pad; fixes the fan blade group to the output end of the transmission assembly so that the fan blade group can rotate smoothly in the shell without touching the inner wall of the shell; injects glue along the glue groove at the bottom of the shell, presses the positioning column into the positioning hole on the assembled PCB assembly, and completes the assembly of the micro fan, wherein the upper end of the fan blade group is slightly lower than the upper end of the shell, and the lower end of the fan blade group does not contact the PCB assembly. The present invention omits the base plate that must be installed in the prior art, and combines the functions of the PCB assembly and the base plate into one, thereby increasing the hollow space in the outer shell so that the airflow is unobstructed when the fan blade group rotates. Since the base plate is omitted, the overall volume is more compact, and the gap between the PCB assembly and the outer shell is increased, which also reduces the risk of the assembly process. At the same time, more space is freed up by utilizing the limited position, making the internal space of the micro fan more rounded, saving more internal space of the micro fan while also improving its performance. The micro fan made by using the present invention has lower noise. At the same time, 3D point gluing technology is used to make the PCB board fit more closely to the periphery of the outer frame, meeting the structural strength of the micro fan while ensuring that the normal application of the micro fan is not restricted and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an exploded view of the micro fan of the present invention.

[0014] Figure 2 It is a cross-sectional view of the micro fan of the present invention.

[0015] Figure 3 This is a schematic diagram of the structure of the PCB assembly and the middle tube after assembly of the utility model.

[0016] Figure 4 For this utility model Figure 3 Top view of .

[0017] Figure 5 It is a structural schematic diagram of the shell of the utility model.

[0018] Figure 6 The figure is a comparison chart of the noise test results of the embodiment of the present utility model and the comparative example. DETAILED DESCRIPTION

[0019] like Figures 1 to 5 As shown, an integrated micro fan includes a PCB assembly 1, a shell 2, a middle tube 3, a fan blade group 4, a wire wrap 5, a solder pad 6, a positioning hole 7, a positioning column 8, a glue groove 9, a PCB board 10, a control chip 11, a resistor 12, a capacitor 13, a PCB circuit diagram 14, a first ring groove 15, a motor 16, a bearing 17, a pressure ring 18, a through groove 19, and a second ring groove 20.

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances. Example

[0023] The micro fan includes a PCB assembly 1, a housing 2, a central tube 3, a transmission assembly, a fan blade assembly 4, a wire wrap 5, and a solder pad 6. The edge of the PCB assembly 1 is provided with a positioning hole 7. Specifically, the PCB assembly 1 includes a PCB board 10, a control chip 11, a resistor 12, a capacitor 13, and a PCB circuit diagram 14. The PCB circuit diagram 14 is arranged on the PCB board 10, and the control chip 11 is attached to the PCB circuit diagram 14. The output end of the control chip 11 is electrically connected to the resistor 12 and the capacitor 13 respectively through the PCB circuit diagram 14. A solder pad 6 is provided in the center of the PCB circuit diagram 14. Positioning holes 7 are provided at the three vertices of the PCB board 10, and the positioning holes 7 can be fixedly engaged with the positioning posts 8. A circular through-groove 19 is provided at the top of the housing 2. The width of the through-groove 19 is smaller than the width of the fan blade assembly 4. A second annular groove 20 is provided at the bottom of the central tube 3. The lower end of the second annular groove 20 is flush with the upper end of the PCB board 10. Glue is filled in the second annular groove 20 and between the PCB board 10.

[0024] The housing 2 is provided with a positioning post 8, the positioning hole 7 is fixedly connected to the positioning post 8, the bottom of the housing 2 is provided with an irregular glue groove 9 along the edge, and the positioning post 8 is provided in the glue groove 9;

[0025] A through hole is opened in the middle of the PCB component 1, and a middle tube 3 is passed through the through hole. A transmission assembly is provided on the middle tube 3. Specifically, the transmission assembly includes a motor 16, a bearing 17 and a pressure ring 18. A first ring groove 15 is provided on the middle tube 3, and the motor 16 is interference-mounted on the first ring groove 15. A bearing 17 is sleeved in the middle of the output end of the motor 16, and the outer wall of the bearing 17 fits with the inner wall of the middle tube 3. The upper end of the bearing 17 and the motor 16 are adaptively connected through the pressure ring 18. The top of the output end of the motor 16 is fixedly connected to the fan blade group 4.

[0026] The output end of the transmission assembly is connected to the fan blade group 4 in a transmission manner. The upper end of the fan blade group 4 is slightly lower than the upper end of the shell 2, and the lower end of the fan blade group 4 does not contact the PCB assembly 1, so that the airflow of the fan blade group 4 is unobstructed when the fan blade group 4 rotates, and the use is smoother; the outer periphery of the transmission assembly is covered with a wire wrap 5, and the wire wrap 5 is fixedly connected to the soldering pad 6, and the soldering pad 6 is provided on the PCB assembly 1.

[0027] The assembly method of the micro fan includes the following steps:

[0028] S1. Use SMT patch to process PCB component 1 and reserve pad 6;

[0029] S2. Based on S1, insert the middle tube 3 through the middle through-hole of the PCB assembly 1, and glue the inner circumference of the connection between the PCB assembly 1 and the middle tube 3 with glue;

[0030] S3. Based on S2, the transmission assembly is mounted on the middle tube 3 and fixed, the wrapped wire 5 is wrapped around the outer periphery of the transmission assembly, and the wrapped wire 5 is soldered to the pad 6;

[0031] S4. Based on S3, the fan blade assembly 4 is fixedly mounted to the output end of the transmission assembly so that the fan blade assembly 4 can rotate smoothly in the housing 2 without touching the inner wall of the housing 2;

[0032] S5. Based on S4, glue is injected along the glue groove 9 at the bottom of the housing 2, and the positioning column 8 is pressed into the positioning hole 7 on the assembled PCB assembly 1 to complete the assembly of the micro fan. The thickness of the assembled micro fan is 3 mm to 6 mm.

[0033] In step S2, 3D glue dispensing technology is used to draw a circle on the inner side of the connection between the PCB assembly 1 and the middle tube 3, so that the PCB board 10 fits more closely with the edge of the shell 2, meeting the structural strength of the micro fan while ensuring that the normal application of the micro fan is not restricted.

[0034] The thickness of the assembled micro fan of the utility model is only 3mm to 6mm, which saves more space than the prior art.

[0035] It should be explained that the PCB board used in this embodiment has undergone pre-treatment for three protections. In this way, after the micro fan is assembled, the bottom of the PCB board can also achieve the functions of waterproof, dustproof and shockproof. The process of performing three protection treatment on the PCB board is a conventional process in the prior art. The present invention does not make any improvements to this process, so it is not described in detail in this embodiment.

[0036] The comparative example is a micro fan commonly purchased on the market, which has a thickness of about 15 mm.

[0037] like Figure 6 As shown, a vibration tester was used in the laboratory to conduct noise tests on the two groups of micro fans of the embodiment and the comparative example during operation. Except for a few specific frequencies, the frequencies of the comparative example fans were generally significantly higher than those of the micro fans of the embodiment, indicating that the technical solution provided by the present invention has better low-frequency FFT performance during operation and is quieter and smoother to use.

[0038] The micro fan assembled using the assembly method of the present invention omits the base plate that must be installed in the prior art, while combining the functions of the PCB assembly 1 and the base plate into one, increasing the hollow space in the outer shell 2 and making the overall volume more compact, so that the airflow is unobstructed when the fan blade group 4 rotates. Since the base plate is omitted, the gap between the PCB assembly 1 and the outer shell 2 becomes larger, which also reduces the risk of the assembly process. At the same time, more space is freed up by utilizing the limited position, making the internal space of the micro fan more rounded, saving more internal space of the micro fan while also improving its performance, and the micro fan made using the utility model has lower noise.

[0039] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of rights of the present invention. Therefore, modifications, equivalent changes, improvements, etc. made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. An integrated micro fan, characterized by: The micro fan comprises a PCB assembly (1), a housing (2), a middle tube (3), a transmission assembly, a fan blade group (4), a wire wrap (5) and a soldering pad (6); a positioning hole (7) is provided on the edge of the PCB assembly (1); a positioning column (8) is provided on the housing (2); the positioning hole (7) is fixedly connected to the positioning column (8); a through hole is opened in the middle of the PCB assembly (1); a middle tube (3) is passed through the through hole; a transmission assembly is provided on the middle tube (3); an output end of the transmission assembly is transmission-connected to the fan blade group (4); the upper end of the fan blade group (4) is slightly lower than the upper end of the housing (2); the lower end of the fan blade group (4) does not contact the PCB assembly (1); the outer periphery of the transmission assembly is covered with a wire wrap (5); the wire wrap (5) is fixedly connected to the soldering pad (6); the soldering pad (6) is provided on the PCB assembly (1).

2. The integrated micro fan according to claim 1, characterized in that: The PCB assembly (1) comprises a PCB board (10), a control chip (11), a resistor (12), a capacitor (13) and a PCB circuit diagram (14); the PCB board (10) is provided with a PCB circuit diagram (14); the control chip (11) is attached to the PCB circuit diagram (14); the output end of the control chip (11) is electrically connected to the resistor (12) and the capacitor (13) respectively through the PCB circuit diagram (14); and a soldering pad (6) is provided in the middle of the PCB circuit diagram (14).

3. The integrated micro fan according to claim 2, characterized in that: The thickness of the micro fan is 3mm-6mm.

4. The integrated micro fan according to claim 3, characterized in that: The transmission assembly includes a motor (16), a bearing (17) and a pressure ring (18), the middle tube (3) is provided with a first annular groove (15), the motor (16) is interference-mounted on the first annular groove (15), the middle part of the output end of the motor (16) is sleeved with a bearing (17), the outer wall of the bearing (17) is in contact with the inner wall of the middle tube (3), the upper end of the bearing (17) and the motor (16) are adaptively connected via the pressure ring (18), and the top of the output end of the motor (16) is fixedly connected to the fan blade group (4).

5. The integrated micro fan according to claim 3 or 4, characterized in that: The bottom of the housing (2) is provided with an irregular glue groove (9) along the edge, and a positioning column (8) is provided in the glue groove (9).

6. The integrated micro fan according to claim 5, characterized in that: Positioning holes (7) are provided at three vertices of the PCB board (10), and the positioning holes (7) and the positioning columns (8) can be fixedly engaged.

7. The integrated micro fan according to claim 2 or 3, characterized in that: A circular through slot (19) is provided on the top of the housing (2), and the width of the through slot (19) is smaller than the width of the fan blade assembly (4).

8. The integrated micro fan according to claim 6, characterized in that: A second annular groove (20) is provided at the lower portion of the middle tube (3), the lower end of the second annular groove (20) is flush with the upper end of the PCB board (10), and glue is filled between the second annular groove (20) and the PCB board (10).

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