COOLING FAN

Abstract

A cooling fan includes: a fan housing mounted on a mounting bracket; a rotary shaft rotatably supported by the fan housing; a rotor fixed to the rotary shaft; a stator fixed to the fan housing and disposed at a predetermined gap from the rotor; an impeller connected to the rotor so as to rotate therewith; and a separation prevention member formed in the mounting bracket so as to prevent the impeller from being separated from the fan housing. the separation prevention bar comprises: a pair of vertical bars formed at opposite edges of the air passage portion in a vertical direction to the mounting bracket and a horizontal bar connecting upper portions of the vertical bars, thereby providing a gap between the impeller and the horizontal bar so that the separation prevention bar does not interfere with rotation of the impeller.

Claims

1. A cooling fan comprising: a mounting bracket having an air passage portion; a fan housing mounted on the mounting bracket, the fan housing having a front surface and an air discharge portion formed in the front surface, wherein the mounting bracket is attached to the front surface of the fan housing for the air passage portion and the air discharge port to correspond to each other; a rotary shaft rotatably supported by a support portion formed in a rear surface of the fan housing, the rear surface being opposite to the front surface; a rotor fixed to the rotary shaft; a stator fixed to the fan housing and disposed at a predetermined gap from the rotor; an impeller connected to the rotor so as to rotate therewith; and a separation prevention bar is formed in the mounting bracket so as to prevent the impeller from being separated from the fan housing, wherein the separation prevention bar comprises: a pair of vertical bars formed at opposite edges of the air passage portion in a vertical direction to the mounting bracket and a horizontal bar connecting upper portions of the vertical bars, thereby providing a gap between the impeller and the horizontal bar so that the separation prevention bar does not interfere with rotation of the impeller.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is an exploded perspective view of a cooling fan according to an embodiment of the present invention.

[0019] FIG. 2 is a perspective view of a cooling fan according to an embodiment of the present invention.

[0020] FIG. 3 is a cross-sectional view of a cooling fan according to an embodiment of the present invention.

[0021] FIG. 4 is a front view of a cooling fan according to an embodiment of the present invention.

[0022] FIG. 5 is a rear-side perspective view of a cooling fan according to an embodiment of the present invention.

[0023] FIG. 6 is a perspective view of a cooling fan according to another embodiment of the present invention.

[0024] FIG. 7 is a cross-sectional view of a cooling fan according to another embodiment of the present invention.

BEST MODE

[0025] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user, the operator, and the like. Definitions of these terms should be based on the content of this specification.

[0026] Referring to FIGS. 1 to 4, a cooling fan according to an aspect of the present invention includes: a fan housing 10 having an air discharge port 12 through which air is discharged therefrom and which is formed on the front surface thereof, and an air inlet 14 through which air flows thereinto and which is formed on the rear surface thereof; a rotary shaft 20 rotatably supported by the fan housing 10; a rotor 30 fixed to the rotary shaft 20; a stator 40 fixed to the fan housing 10 and disposed at a predetermined gap from the rotor 30; and an impeller 50 connected to the rotor 30 so as to rotate therewith.

[0027] The fan housing 10 has a front surface and a rear surface open to allow air to pass through, and a support portion 60 to which the stator 40 is fixed and which is formed in the center thereof while the rotary shaft 20 is rotatably supported in the center thereof.

[0028] The stator 40 includes a stator core 42 fixed to the outer circumferential surface of the support portion 60, a bobbin 44 mounted on the outer surface of the stator core 42, and a coil 46 wound around the bobbin 44 and through which electric power is applied.

[0029] A printed circuit board (PCB) 70 is mounted on the lower side of the stator 40, and the PCB 70 is equipped with various circuit components required for cooling fan control and a Hall sensor for measuring the number of revolutions of the rotor 30. The coil 46 of the stator 40 is electrically connected to a cable for external power connection.

[0030] The rotor 30 is disposed with a certain gap on the outer circumferential surface of the stator 40 and includes a magnet 32 formed in a cylindrical shape, a back yoke 34 disposed on the outer circumferential surface of the magnet 32, and a rotor support 36 to which the magnet 32 and the back yoke 34 are fixed and the impeller 50 is connected.

[0031] The rotor support 36 includes a disk portion 72 having a rotary shaft 20 connected to the center thereof and formed in a disk shape, and a cylindrical portion 74 vertically extending from the edge of the disk portion 72, and on the inner surface of which the magnet 32 and the back yoke 34 are fixed, and on the outer surface of which the impeller 50 is formed.

[0032] The impeller 50 is integrally formed with the rotor support 36 on the outer circumferential surface of the rotor support 36. That is, the impeller 50 and the rotor support 36 are formed by performing insert injection while the magnet 32, the back yoke 34, and the rotary shaft 20 are disposed in a mold, and the rotary shaft 20, the magnet 32 and the back yoke 34 are fixed on the rotor support 36.

[0033] Fastening holes 64 for fixing a mounting bracket on which a cooling fan is mounted are formed at the corners of the fan housing 10. The fastening holes 64 are formed to penetrate through the corners of the fan housing 10 and can be used to fix the cooling fan to the mounting bracket by bolt fastening, bonding, or fitting.

[0034] The support portion 60 is formed in a cylindrical shape in the center of the fan housing 10, and on the inner surface of which the rotary shaft 20 is rotatably inserted, and on the outer surface of which the stator 40 is fixed.

[0035] The fan housing 10 is integrally molded by a mold and made of a resin material. That is, as shown in FIG. 5, a connecting rib 62 and the supporting portion 60 are integrally formed with the fan housing 10 on the rear surface of the fan housing 10, and the lower surface of the supporting portion 60 is formed in a blocked state.

[0036] The rotary shaft 20 is rotatably supported by a sleeve bearing 66 on the inner surface of the support portion 60, and a bushing 68 is mounted on the bottom surface of the support portion 60 in which the lower end of the rotary shaft 20 is rotatably contacted on the bottom surface of the support portion 60.

[0037] In the cooling fan described above, the impeller 50 may be separated from the fan housing 10 when the impeller 50 is rotated because the rotary shaft 20 is vertically movably inserted into the support portion 60 and the sleeve bearing 66 is used.

[0038] In the present invention, a separation prevention unit is installed on any one of the fan housing and the mounting bracket to prevent separation of the impeller 50.

[0039] The separation prevention unit according to an embodiment is equipped with a separation prevention member 80 on the front edge where an air discharge port 12 of the fan housing 10 is formed to prevent separation of the impeller 50.

[0040] The separation preventing member 80 includes a fixing portion 82 fixed to a front edge at which the air discharge ort 12 of the fan housing 10 is formed, and a locking portion 84 protruding inwardly of the air discharge port 12 from the fixing portion 82 to block the rising of the impeller 50.

[0041] The fixing portion 82 includes the same through holes 86 as the fastening holes 64 formed at the corners of the fan housing 10, and is fixed to the fan housing 10 by bolts or rivets. Then, the locking portion 84 protrudes a predetermined length toward the inside of the air discharge port 12 of the fan housing 10 to prevent the impeller 50 from being separated from the fan housing 10.

[0042] The protruding length of the locking portion 84 prevents separation of the impeller 50 while minimizing the area blocking the air discharge port 12, thereby preventing separation of the impeller 50 without affecting the air discharge.

[0043] The separation prevention member 80 may be formed of a metal material having strong strength, and may be installed in a plurality of pieces at regular intervals in the circumferential direction of the fan housing 10. As an example, the separation prevention member 80 may be mounted in two pieces on the edge of the fan housing 10 at intervals of 180 degrees, and four pieces at intervals of 90 degrees.

[0044] As described above, the separation prevention member 80 is fixed to the edge of the fan housing 10 and is formed to protrude only a predetermined length in the inner direction of the air discharge port 12, thereby minimizing the area blocking the air discharge port 12 and preventing separation of the impeller 50.

[0045] As shown in FIGS. 6 and 7, the separation prevention unit according to another embodiment includes a separation prevention bar 100 formed in a mounting bracket 90 on which a cooling fan is mounted. Accordingly, when the cooling fan is mounted on the mounting bracket 90, the impeller 50 can be prevented from being separated, so that a separation prevention structure for preventing the impeller from being separated from the cooling fan is unnecessary, thereby simplifying the structure and simplifying the assembly process.

[0046] The mounting bracket 90 communicates with the air discharge port 12 of the fan housing 10 to form an air passage portion 94 through which air passes, and a fastening protrusion 92 that is fastened to a fastening hole portion 64 formed in the fan housing 10 is formed at the edge of the mounting bracket 90.

[0047] The separation prevention bar 100 is formed to extend inwardly from the edge of the air passage portion 94 to prevent the impeller 50 from being separated from the fan housing 10.

[0048] The separation prevention bar 100 includes a pair of vertical bars 98 formed vertically at both edges of the air passage portion 94, and a horizontal bar 96 formed to connect between the pair of vertical bars 98 to prevent separation of the impeller 50.

[0049] When the cooling fan is mounted on the mounting bracket 90, the vertical bars 98 play a role of maintaining a certain gap between the impeller 50 and the horizontal bar 96 so that the horizontal bar 96 does not interfere with the rotation of the impeller 50.

[0050] As described above, the separation prevention unit according to another embodiment integrally forms the separation prevention bar 100 when forming the mounting bracket 90, and the cooling fan does not need a separate part for preventing separation of the impeller, so the number of parts can be reduced and the assembly process can be simplified.

[0051] While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, by way of illustration and example only, it is clearly understood that the present invention is not to be construed as limiting the present invention, and various changes and modifications may be made by those skilled in the art within the protective scope of the invention without departing off the spirit of the present invention.

INDUSTRIAL APPLICABILITY

[0052] The present invention can be usefully applied to cooling fans for preventing overheating of electronic devices, automobiles, LED lightings or the like.