Integrated miniature fan and assembling method

Abstract

The invention discloses an integrated miniature fan and an assembling method. The assembling method comprises the following steps: firstly, processing a PCB (Printed Circuit Board) assembly by using SMT (Surface Mount Technology), and reserving a bonding pad; 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 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 shell is enlarged, the risk of the assembly technology is synchronously reduced, more internal space of the miniature fan is saved, and meanwhile the performance of the miniature fan can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation fans, and in particular to an integrated micro fan and an assembly method thereof. Background Art

[0002] The traditional micro fan design is to design and assemble the PCB board and the base plate separately, so that an assembly gap is required between the PCB board and the base plate, and a gap is also required between the PCB board and the fan rotor. When the fan is running, the airflow passing through the middle is blocked, which invisibly increases the fan noise and causes inconvenience in use. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an integrated micro fan and an assembly method, characterized in that: the micro fan comprises a PCB assembly, a shell, a middle tube, a transmission assembly, a fan blade group, a wire wrap and a pad, a positioning hole is provided at the edge of the PCB assembly, a positioning column is provided on the 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, a transmission assembly is provided on the middle tube, an output end of the transmission assembly is transmission-connected to the fan blade group, an upper end of the fan blade group is slightly lower than an upper end of the shell, and a lower end of the fan blade group does not contact the PCB assembly; the outer periphery of the transmission assembly is coated with a wire wrap, the wire wrap is fixedly connected to the pad, and the pad is provided on the PCB assembly; The assembly method of the micro fan comprises the following steps: S1. Use SMT patches to process PCB components and reserve pads; S2. Based on S1, insert the middle tube from the middle through hole of the PCB assembly, and glue and fix the PCB assembly and the middle tube by drawing circles on the inner circumference of the connection between the PCB assembly and the middle tube; S3, based on S2, the transmission component is adapted and installed on the middle tube, a coated wire is wrapped around the outer periphery of the transmission component, and then the coated wire is soldered to the pad; S4. Based on S3, the fan blade group is fixedly installed on the output end of the transmission assembly so that the fan blade group can rotate smoothly in the housing without touching the inner wall of the housing; S5. Based on S4, glue is injected along the glue groove at the bottom of the shell, and the positioning column is pressed into the positioning hole on the assembled PCB assembly to complete the assembly of the micro fan.

[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, a control chip is attached to the PCB circuit diagram, and the output end of the control chip is electrically connected to the resistor and the 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, a motor is interference-mounted on the first ring groove, a bearing is sleeved in the middle of the output end of the motor, 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 via 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 and the positioning posts can be fixedly engaged.

[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: (1) The present invention first uses SMT patches to process the PCB assembly and reserve a solder pad; inserts the middle tube from the middle through hole of the PCB assembly, and uses a circular glue to glue and fix the inner circumference of the connection between the PCB assembly and the middle tube; fits the transmission assembly on the middle tube and fixes it, wraps the coated wire around the outer circumference of the transmission assembly, and then solders the coated wire to the solder pad; fixes the fan blade group and 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 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, so that the internal space of the micro fan is more rounded, which can save more internal space of the micro fan while improving its performance, and the micro fan made by the present invention has lower noise; at the same time, 3D point gluing technology is used to make the PCB board fit more closely with the periphery of the outer frame, which meets 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

[0012] Figure 1 It is an exploded view of the micro fan of the present invention.

[0013] Figure 2 It is a cross-sectional view of the micro fan of the present invention.

[0014] Figure 3 It is a schematic diagram of the structure after the PCB assembly and the middle tube of the present invention are assembled.

[0015] Figure 4 For the present invention Figure 3 Top view of the .

[0016] Figure 5 It is a schematic structural diagram of the shell of the present invention.

[0017] Figure 6 It is a comparison chart of noise test results of the embodiment of the present invention and the comparative example. DETAILED DESCRIPTION

[0018] like Figures 1 to 5As 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.

[0019] 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.

[0020] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0022] The micro fan includes 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 pad 6. A positioning hole 7 is provided at the edge of the PCB assembly 1. 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 board 10 is provided with a PCB circuit diagram 14, and a 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 through the PCB circuit diagram 14; a pad 6 is provided in the middle of the PCB circuit diagram 14; and 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 columns 8. A circular through groove 19 is provided at the top of the housing 2, and the width of the through groove 19 is less than the width of the fan blade group 4. A second annular groove 20 is provided at the lower part of the middle tube 3, and 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.

[0023] 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; 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 arranged 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 is adaptably connected to the motor 16 through the pressure ring 18, and the top of the output end of the motor 16 is fixedly connected to the fan blade group 4.

[0024] The output end of the transmission component is connected to the fan blade group 4 in transmission. 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 component 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 component is covered with a wire wrap 5, and the wire wrap 5 is fixedly connected to the pad 6, and the pad 6 is arranged on the PCB component 1.

[0025] The assembly method of the micro fan comprises the following steps: S1. Use SMT patch to process PCB component 1 and reserve pad 6; S2. Based on S1, insert the middle tube 3 from the middle through hole of the PCB component 1, and glue and fix the inner circumference of the connection between the PCB component 1 and the middle tube 3 with a circular dot glue; S3, based on S2, the transmission component is adapted and installed on the middle tube 3, the wrapped wire 5 is wrapped around the outer periphery of the transmission component, and then the wrapped wire 5 is soldered to the pad 6; S4. Based on S3, the fan blade group 4 is fixedly installed with the output end of the transmission assembly so that the fan blade group 4 can rotate smoothly in the housing 2 without touching the inner wall of the housing 2; 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.

[0026] 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 and the edge of the shell 2 fit more closely, meeting the structural strength of the micro fan while ensuring that the normal application of the micro fan is not restricted.

[0027] The thickness of the assembled micro fan of the present invention is only 3 mm to 6 mm, which saves more space than the prior art.

[0028] It should be explained that the PCB board used in this embodiment has undergone preliminary three-proof treatment, so that 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-proof 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.

[0029] The comparative example is a micro fan commonly purchased on the market, and its thickness is about 15 mm.

[0030] 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 comparison example. Except for a few specific frequencies, the frequencies of the comparison example fans are generally significantly higher than the micro fans of the embodiment, indicating that the technical solution provided by the present invention has better low-frequency FFT performance when working and is quieter and smoother to use.

[0031] The micro fan assembled using the assembly method of the present invention omits the base plate that must be installed in the prior art, and combines the functions of the PCB component 1 and the base plate into one, thereby increasing the hollow space in the outer shell 2 so that the airflow is unobstructed when the fan blade group 4 rotates. Since the base plate is omitted, the overall volume is more compact, and the gap between the PCB component 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, so that the internal space of the micro fan is more rounded, which can improve its performance while saving more internal space of the micro fan, and the micro fan made using the present invention has lower noise.

[0032] The above-mentioned 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 and an assembly method, characterized in that: The micro fan comprises a PCB assembly (1), an outer shell (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 at the edge of the PCB assembly (1); a positioning column (8) is provided on the outer shell (2); the positioning hole (7) is fixedly connected to the positioning column (8); a through hole is provided 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); an upper end of the fan blade group (4) is slightly lower than an upper end of the outer shell (2); and a lower end of the fan blade group (4) does not contact the PCB assembly (1); a wire wrap (5) is provided on the outer periphery of the transmission assembly; the wire wrap (5) is fixedly connected to the soldering pad (6); and the soldering pad (6) is provided on the PCB assembly (1); The assembly method of the micro fan comprises the following steps: S1. Use SMT patch to process the PCB assembly (1) and reserve the solder pad (6); S2. Based on S1, the middle tube (3) is inserted into the middle through hole of the PCB component (1), and the PCB component (1) and the middle tube (3) are fixed by glue at the inner circumference of the connection between the PCB component (1) and the middle tube (3); S3, based on S2, the transmission component is mounted on the middle tube (3) and fixed, a sheathed wire (5) is wrapped around the outer periphery of the transmission component, and the sheathed wire (5) is then soldered to the soldering pad (6); S4. Based on S3, the fan blade group (4) is fixedly mounted on the output end of the transmission assembly, so that the fan blade group (4) can rotate smoothly in the housing (2) without touching the inner wall of the housing (2); 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 component (1), thereby completing the assembly of the micro fan.

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

4. The integrated micro fan and assembly method according to claim 3, characterized in that: The transmission assembly comprises a motor (16), a bearing (17) and a pressure ring (18); a first annular groove (15) is provided on the middle tube (3); the motor (16) is interference-fitted on the first annular groove (15); a bearing (17) is sleeved in the middle of the output end of the motor (16); 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) is adaptively connected to the motor (16) 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. An integrated micro fan and assembly method 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 and assembly method 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. An integrated micro fan and assembly method according to claim 2 or 3, characterized in that: A circular through slot (19) is provided on the top of the outer shell (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 and assembly method according to claim 6, characterized in that: A second annular groove (20) is provided at the lower part 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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