Computer fan with built-in magnet

Abstract

The utility model discloses a computer fan with built-in magnetic attraction, which comprises a shell, a rotating shaft, an impeller and a driving device, a support is arranged at the bottom of the shell, a shaft seat extending upwards is arranged in the middle of the support, the shaft seat is provided with a shaft hole, a clamping groove is arranged at the lower section of the shaft hole, the clamping groove is provided with a metal lining, and the metal lining is arranged on the rotating shaft. The metal lining is a pipe body with an opening in the upper end, a permanent magnet is arranged in the pipe body, a wear-resisting piece is arranged on the upper wall of the permanent magnet, the rotating shaft is installed in the shaft hole in a pivoted mode, a bearing is arranged between the outer wall of the rotating shaft and the inner wall of the shaft hole, and the rotating shaft is made of magnetic metal. The lower end of the rotating shaft extends into the pipe body and is attached to the upper wall of the wear-resisting piece, the permanent magnet is used for applying magnetic attraction force close to the rotating shaft to the rotating shaft, a positioning hole is formed in the lower wall of the middle of the impeller, the top end of the rotating shaft is arranged in the positioning hole, and the driving device is arranged between the inner circumferential wall of the impeller and the support. And the driving device is used for driving the impeller to rotate.

Description

Technical Field

[0001] This utility model relates to the field of computer fans, and in particular to a magnetically built-in computer fan. Background Technology

[0002] With the development of computers, the requirements for cooling fans are also increasing. Existing computer fans generally use a single bracket structure to position the impeller. However, the impeller generates upward pressure at the initial start-up. If the bearing limit is faulty, the impeller may detach from the bracket. Therefore, to achieve stable impeller rotation, for example, Chinese patent CN202420495063.8 uses a double bracket structure, which ensures stable impeller rotation. However, in actual use, the double bracket also generates a certain amount of wind resistance, which reduces the airflow speed and increases noise.

[0003] Of course, there are also structures that use magnetic components on the lower wall of the support. However, the support between the magnetic component and the shaft has a certain wall thickness, so the magnetic attraction between the magnetic component and the shaft is limited, and the constraint force on the upward movement of the impeller is poor. Utility Model Content

[0004] The main purpose of this invention is to propose a magnetically attached computer fan, which aims to improve the structure of the computer fan, make it easier to install the magnetic component inside the bearing seat, increase the magnetic attraction between the shaft and the magnetic component, and thus improve the rotational stability of the shaft.

[0005] To achieve the above objectives, this utility model proposes a magnetically attached built-in computer fan, comprising:

[0006] The housing has a support at its bottom, an upwardly extending bearing in the middle of the support, a shaft hole in the bearing, a slot in the lower section of the shaft hole, a metal bushing in the slot, and a tube with an opening at its upper end. A permanent magnet is installed inside the tube, and a wear-resistant plate is installed on the upper wall of the permanent magnet.

[0007] A rotating shaft is pivotally mounted within a shaft hole. A bearing is provided between the outer wall of the rotating shaft and the inner wall of the shaft hole. The rotating shaft is made of a magnetic metal, and its lower end extends into the tube body and is in contact with the upper wall of the wear-resistant plate.

[0008] The permanent magnet is used to apply a magnetic attraction force to the rotating shaft near it;

[0009] An impeller, wherein a positioning hole is provided on the lower wall of the middle part of the impeller, and the top end of the rotating shaft is located in the positioning hole;

[0010] A drive device is disposed between the inner peripheral wall of the impeller and the support, and the drive device is used to drive the impeller to rotate.

[0011] In the actual design, the permanent magnet, metal bushing, and wear-resistant plate are treated as independent modules. During installation, the modules are assembled together, and then the metal bushing is installed in the shaft hole. This avoids the problem of the existing shaft hole being too long and the wear-resistant plate being too thin, which makes installation or fixing more difficult (because the metal bushing is too short). Through the cooperation between the rotating shaft made of magnetic metal and the permanent magnet, the gap between the permanent magnet and the lower end of the rotating shaft is reduced, thereby improving the magnetic attraction force, reducing the upward floating caused by the initial rotation of the rotating shaft, and improving the rotational stability. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the present invention;

[0013] Figure 2 This is a half-sectional schematic diagram of the present invention;

[0014] Figure 3 This is a half-sectional view of the present invention in its exploded state;

[0015] Figure 4 This is a partially enlarged schematic diagram of the present invention.

[0016] In the picture,

[0017] 1 is the housing, 10 is the bracket, 11 is the bearing seat, 12 is the shaft hole, and 12a is the slot.

[0018] 2 is a metal bushing, 21 is a permanent magnet, 22 is a wear-resistant plate, 2a is a stop, and 2b is a stepped section.

[0019] 3 is the pivot point.

[0020] 4 represents the impeller, and 41 represents the positioning hole.

[0021] 5 is a limiting protrusion.

[0022] 6 represents the drive unit, 61 represents the stator, and 62 represents the rotor.

[0023] 7 represents the retaining ring, and 70 represents the bearing.

[0024] 81 is the PCB board, and 82 is the LED light. Detailed Implementation

[0025] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0026] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0028] like Figures 1 to 4 As shown, a magnetically attached built-in computer fan includes:

[0029] The housing 1 has a support 10 at its bottom, a shaft seat 11 extending upward in the middle of the support 10, a shaft hole 12 in the shaft seat 11, a slot 12a in the lower section of the shaft hole 12, a metal bushing 2 in the slot 12a, and a tube with an opening at the upper end. A permanent magnet 21 is provided inside the tube, and a wear-resistant plate 22 is provided on the upper wall of the permanent magnet 21.

[0030] A rotating shaft 3 is pivotally mounted within a shaft hole 12. A bearing 70 is provided between the outer wall of the rotating shaft 3 and the inner wall of the shaft hole 12. The rotating shaft 3 is made of magnetic metal, and its lower end extends into the tube body and is in contact with the upper wall of the wear-resistant plate 22.

[0031] The permanent magnet 21 is used to apply a magnetic attraction force to the rotating shaft 3 near it;

[0032] Impeller 4, the lower wall of the middle part of the impeller 4 is provided with a positioning hole 41, and the top end of the rotating shaft 3 is located in the positioning hole 41;

[0033] The driving device 6 is located between the inner peripheral wall of the impeller 4 and the support 10, and is used to drive the impeller 4 to rotate.

[0034] In the actual design, the permanent magnet 21, the metal bushing 2, and the wear-resistant plate 22 are treated as independent modules. During installation, the modules are assembled together, and then the metal bushing 2 is installed in the shaft hole 12. This avoids the problem that the existing shaft hole 12 is too long and the wear-resistant plate 22 is too thin, which makes installation or fixing more troublesome (the metal bushing 2 is too short). Through the cooperation between the rotating shaft 3 made of magnetic metal and the permanent magnet 21, the gap between the permanent magnet 21 and the lower end of the rotating shaft 3 is reduced, thereby improving the magnetic attraction force, reducing the upward floating caused by the initial rotation of the rotating shaft 3, and improving the rotational stability.

[0035] Specifically, the permanent magnet 21 is a Teflon sheet or a ceramic sheet. Using non-metallic materials can reduce the metal shavings generated by the friction between the rotating shaft 3 and the other side, while avoiding excessive rotational resistance caused by magnetic attraction and reducing the rotational resistance at the initial stage of rotation.

[0036] In this embodiment of the utility model, the slot 12a is provided with a limiting protrusion 5 extending axially. The limiting protrusion 5 is arranged at intervals along the circumference. The metal bushing 2 is interference-fitted with the limiting protrusion 5. In actual installation, a predetermined pressure is applied to the metal bushing 2 to deform it, thereby locking the metal bushing 2 and realizing the installation.

[0037] Specifically, the drive device 6 includes a stator 61 located around the shaft seat 11 and a rotor 62 located around the impeller 4. The stator 61 is a magnetic induction coil and the rotor 62 is a permanent magnet 21, thereby realizing the rotation of the impeller 4, which is the structure of a brushless motor.

[0038] In this embodiment of the utility model, the upper end of the metal bushing 2 is provided with an outwardly extending stop 2a, and the upper end of the slot 12a is provided with a stepped part 2b. The lower wall of the stop 2a abuts against the upper wall of the stepped part 2b, thereby realizing the limiting and installation of the metal bushing 2.

[0039] Specifically, the inner diameter of the slot 12a is smaller than the inner diameter of the shaft hole 12, forming a stepped structure during the one-piece molding of plastic.

[0040] In this embodiment of the present invention, the lower end of the bearing 70 is provided with a retaining ring 7, which fits against the upper wall of the stop 2a. The bearing 70 is tightly fitted and pressed against the retaining ring 7 to perform a fastening function, while ensuring the stability of the bearing 70's axis. The rotating shaft 3 passes through the middle of the retaining ring 7 and extends into the slot 12a.

[0041] Specifically, the metal bushing 2 is made of copper, which can reduce the magnetic force dispersion of the permanent magnet 21 while ensuring magnetic stability.

[0042] In this embodiment of the invention, the lower end of the rotating shaft 3 is arc-shaped, wherein the arc-shaped part can reduce the contact area and at the same time ensure the stability of the rotation of the rotating shaft 3.

[0043] Specifically, the upper wall of the bracket 10 away from the shaft seat 11 is provided with a PCB board 81, the magnetic coil is connected to the PCB board 81, and the PCB board 81 is provided with LED lights 82 distributed along its circumference, which realizes the lighting effect of the fan. At the same time, the structure is simple and convenient for connecting the magnetic coil.

[0044] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A magnetically built-in computer fan, characterized in that, include: The housing has a support at its bottom, an upwardly extending bearing in the middle of the support, a shaft hole in the bearing, a slot in the lower section of the shaft hole, a metal bushing in the slot, and a tube with an opening at its upper end. A permanent magnet is installed inside the tube, and a wear-resistant plate is installed on the upper wall of the permanent magnet. A rotating shaft is pivotally mounted within a shaft hole. A bearing is provided between the outer wall of the rotating shaft and the inner wall of the shaft hole. The rotating shaft is made of a magnetic metal, and its lower end extends into the tube body and is in contact with the upper wall of the wear-resistant plate. The permanent magnet is used to apply a magnetic attraction force to the rotating shaft near it; An impeller, wherein a positioning hole is provided on the lower wall of the middle part of the impeller, and the top end of the rotating shaft is located in the positioning hole; A drive device is disposed between the inner peripheral wall of the impeller and the support, and the drive device is used to drive the impeller to rotate.

2. The magnetically attached built-in computer fan as described in claim 1, characterized in that: The permanent magnet is a Teflon sheet or a ceramic sheet.

3. The magnetically attached built-in computer fan as described in claim 1, characterized in that: The slot is provided with a limiting protrusion extending axially, the limiting protrusions are spaced apart circumferentially, and the metal bushing is interference-fitted with the limiting protrusion.

4. The magnetically attached built-in computer fan as described in claim 1, characterized in that: The drive device includes a stator located around the shaft seat and a rotor located around the impeller. The stator is a magnetic induction coil and the rotor is a permanent magnet.

5. The magnetically attached built-in computer fan as described in claim 1, characterized in that: The upper end of the metal bushing is provided with an outwardly extending stop, and the upper end of the slot is provided with a stepped portion, with the lower wall of the stop abutting against the upper wall of the stepped portion.

6. The magnetically attached built-in computer fan as described in claim 1, characterized in that: The inner diameter of the slot is smaller than the inner diameter of the shaft hole.

7. The magnetically attached built-in computer fan as described in claim 1, characterized in that: The lower end of the bearing is provided with a retaining ring, which fits against the upper wall of the stop.

8. The magnetically attached built-in computer fan as described in claim 1, characterized in that: The metal bushing is made of copper.

9. The magnetically attached built-in computer fan as described in claim 1, characterized in that: The lower end of the shaft is arc-shaped.

10. The magnetically attached built-in computer fan as described in claim 4, characterized in that: The bracket has a PCB board on its upper wall away from the shaft seat. The magnetic coil is connected to the PCB board, and the PCB board has LED lights distributed along its circumference.

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