JP2004183649A - Fan motor, casing of electronic or electric appliance, and electronic or electric appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase air flow exhausted from an electronic or electric appliance, and to reduce noise of exhaust flow exhausted from a casing of the electronic or electric appliance. <P>SOLUTION: The casing 2 used for the electronic or electric appliance has an opening 2a for passing air into or out of the casing with a fan motor 10 disposed adjacently, and the opening 2a has a finger guard 5 for preventing intrusion of a finger, a foreign matter, or the like into the fan motor 10. The finger guard section 5 has a first rib group 51 extending linearly in the lateral direction and a second rib group 51 extending linearly in the vertical direction. Each of ribs 51 and 52 has a tilting surface 5c facing the inside or the outside of the opening 2a in the flowing direction of the air exhausted from the fan motor 10. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to an electronic or electric device having a cooling fan mounted in a housing of a personal computer, a computer game machine, a printer, or the like, a housing used for the same, and a fan used for these.

  2. Description of the Related Art Electronic or electric devices such as personal computers, computer game machines, and printers have various mechanical components housed in a housing. Since the inside of the casing becomes high temperature due to the heat generated from these mechanical components, a cooling fan is installed in the casing. This fan is usually installed near an opening (exhaust port) provided on the side wall surface of the housing. The inside of the housing is cooled by discharging the air inside the housing to the outside through the opening.

  Generally, a mesh guard called a finger guard is provided in the opening so that a finger or a foreign substance does not enter the housing to stop the fan or damage the human body. I have. This finger guard is, for example, a combination of an annular rib and a radial rib as shown in FIG. 13A (see FIG. 9 of Patent Document 1), or a plurality of ribs as shown in FIG. Some are arranged in a lattice (see FIG. 5 of Patent Document 2 and FIG. 1 of Patent Document 3).

  However, if a mesh-shaped finger guard is provided in this opening, which is the exhaust port of the cooling fan, the exhaust flow collides with the finger guard, and there is a problem that the exhaust is not smoothly exhausted. There is also a problem that the exhaust gas collides with the finger guard and generates a loud noise.

  On the other hand, known finger guards are known in which the air resistance is reduced by making the corners of the ribs forming the net into curved surfaces (see FIG. 2 of Patent Document 2 and Patent Document 3). (See FIG. 3). However, these have only a curved surface of the rib, and the curved surface does not sufficiently consider the direction of the airflow passing therethrough, and the above-mentioned problem has not been improved.

  In recent years, with higher performance and miniaturization of electronic or electric devices, further cooling performance and quietness are required. However, conventional finger guards have not been able to sufficiently satisfy such requirements.

JP-A-2000-257597 JP-A-5-27062 JP-A-11-354964

  SUMMARY OF THE INVENTION An object of the present invention is to provide a housing for an electronic or electric device with a fan motor that is sucked and discharged with high efficiency and low noise from an opening with a finger guard. Another object of the present invention is to provide a fan motor with a finger guard for sucking and discharging air with high efficiency and low noise.

  The present invention is characterized by a cross-sectional shape of a rib of a finger guard provided in a flow path of a cooling fan. One finger guard according to the present invention includes a plurality of first ribs extending linearly in the left-right direction and a plurality of second ribs extending linearly in the vertical direction. The first and second ribs have inclined surfaces substantially parallel to or along the flow direction of the air sucked and discharged while being spirally rotated from the fan motor. Further, other finger guards related to the present invention, the ribs formed in a lattice shape or a mesh shape are substantially parallel to or along the direction of the flow of air sucked and discharged while spirally rotating from the fan motor, It has at least one inclined surface.

  The present invention is applied to an electronic device housing provided with such a finger guard in an opening near a fan motor installation location. Further, the present invention is realized by providing such a finger guard on the outer frame of the fan motor itself. In this case, the finger guard may be formed integrally with the electronic device housing or the fan motor outer frame. Further, a support member may be provided on the finger guard, and the finger guard may be attached to an electronic device housing or a fan motor outer frame, or may be attached via an attachment member dedicated to a fan.

  The fan motor, the housing of the electronic or electric device, and the electronic or electric device of the present invention are provided with the finger guard so as not to obstruct the flow of the intake / exhaust flow impinging on the rib and to prevent turbulence. As a result, the cooling efficiency is improved and the generation of noise is suppressed.

-First embodiment-
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view schematically showing the internal structure of an electronic or electric device. FIG. 2 is a cross-sectional view of a main part showing a fan motor mounted on the device. FIG. 3 is a cross-sectional view of a main part when cut along line YY in FIG. FIG. 4 is a plan view of a main part when the opening of the electronic or electric device housing of FIG. 1 is viewed from the inside to the outside.

Electronic or Electric Equipment The electronic or electric equipment 1 according to the first embodiment shown in FIG. 1 is, for example, a main body of a desktop personal computer, and a fan motor 10 for cooling is installed in a housing 2. The fan motor 10 is installed near the inside of an opening 2 a provided on the side wall surface of the housing, and exhausts the internal air to the outside through the opening 2 a to cool the inside of the housing 2. A finger guard 5 (corresponding to a guard plate) shown in FIG. 2 is formed integrally with the opening 2a. The side wall surface forming the opening 2a is formed as a member separate from the housing 2 (hereinafter, referred to as a sub panel 4). The sub-panel 4 is made of a synthetic resin, and is integrally formed with a tubular portion 6 surrounding the fan motor 10 in addition to the finger guard 5 formed in the opening 2a. In the present embodiment, the sub panel 4 corresponds to a frame that forms an outer frame of the fan motor 10. The finger guard 5 is formed on the sub-panel 4. The sub-panel 4 constitutes a part of the housing 2, and thus the finger guard 5 is equivalent to being fixed to the housing 2.

Configuration of Finger Guard As shown in FIG. 4, the finger guard 5 has a mesh grid formed by ribs (first rib group 51 and second rib group 52) extending in two directions. The first rib group 51 is composed of six ribs 51a to 51f provided at positions connecting six points that appear when the right and left sides of the paper of FIG. The second rib group 52 is constituted by three ribs 52a to 52c provided at positions connecting three points that appear when the upper and lower sides of the paper surface of FIG. . Hereinafter, the direction in which the first rib group 51 extends is referred to as the left-right direction, and the direction in which the second rib group 52 extends is referred to as the up-down direction.

  The thickness of the rib groups 51 and 52 is substantially the same as that of the sub panel 4. The rib ends of both rib groups 51 and 52 are integrally connected to the periphery of the opening 2a. Intermediate portions of the rib groups 51 and 52 are orthogonally and integrally connected to each other.

  Each of the ribs 51a to 51f, 52a to 52c, and one rectangular opening 50 surrounded by these ribs and the periphery of the opening 2a are large enough to prevent a fingertip or the like from entering. An opening surrounded by the ribs 51b, 51e, 52a, and 52c is integrally formed with a disk portion 11 for closing the opening. This disk portion is a motor support portion 11 described later.

  Each of the ribs 51a to 51f and 52a to 52c extends linearly with the same width, and the orthogonal cross section is a right triangle. Details will be described using the ribs 52a to 52c as an example with reference to FIG. In the present embodiment, the bottom surface 5a corresponding to the base of the right triangle is all flush with the outer surface 2a of the housing 2. On the other hand, the side surface 5b corresponding to the height of the right triangle is parallel to the rotation axis 16 of the fan motor 10 and located upstream with respect to the airflow generated by the rotation of the fan motor 10. Further, the inclined surface 5c corresponding to the hypotenuse of the right triangle is a direction substantially parallel to or along the direction of the airflow discharged from the impeller 17 (arrow F2). With respect to the rib cross section of the finger guard, at least one surface is inclined substantially parallel to or along the direction of the air flow discharged from the fan motor 10, thereby preventing turbulence and providing high-efficiency cooling. It achieves performance and low noise.

  Next, other portions of the ribs 52a to 52c and the ribs 51a to 51f will be described. In the first rib group 51, when the ribs 51a to 51f are bisected by a straight line (rib 52b) passing vertically through the center of the opening 2a, the inclined surface 5c of the first rib group 51 located on the left side of the rib 52b becomes Turning to the lower side of FIG. Similarly, the inclined surface 5c of the first rib group 51 located on the right side of the rib 52b faces upward in FIG. The turbulence is prevented by arranging the inclined surfaces of the ribs substantially in parallel with or in the direction of the air flow discharged while spirally rotating from the fan motor. Thereby, the flow of the air passing through the finger guard 5 is made smooth, the loss due to the airflow hitting the ribs is minimized, and the noise is reduced.

  Similarly, in the second rib group 52, when the ribs 52a to 52c are bisected by a straight line L passing through the center of the opening 2a in the left-right direction, the inclined surface 5c of the second rib group 52 located above the straight line L Turn left. Similarly, the inclined surface 5c of the second rib group 52 located below the straight line L faces rightward. The rib sides between the ribs 51c and 51d on the rib 52a on the straight line L and the rib sides between the ribs 51c and 51d on the rib 52c have their respective inclined surfaces spiraled from the fan motor. The inclined surface is set in a direction substantially parallel to or along the direction of the air flow discharged while rotating in the shape.

Configuration of Fan Motor As shown in FIG. 2, the fan motor 10 includes an impeller 17 in the motor. The fan motor 10 is provided with the bearing means 12, the armature 14, and the circuit board 15 in the motor support 11 described above. The bearing means 12 rotatably supports the rotating shaft 16 connected to the impeller 17. The impeller 17 has a plurality of blades formed on an outer peripheral surface of a cup-shaped main body, and is provided with a magnet 19 via a yoke 18 on an inner peripheral surface of the main body. When a current flows through the armature 14, a rotational force is generated in the magnet 19 by a magnetic action between the armature 14 and the magnet 19, and the impeller 17 rotates. Thereby, the plurality of blades rotate to generate an airflow in the direction of arrow F1.

Next, features of the electronic or electric device 1 will be described.

  As a first feature, a finger or foreign matter (for example, a coin) or the like enters the fan motor 10 attached to the inside of the opening 2a from the outside of the opening 2a due to the finger guard 5, so that a malfunction with respect to the fan motor 10 is prevented. Can be prevented.

  As a second feature, since the first and second rib groups 51 and 52 are formed with the inclined surface 5c as described above, the air discharged from the fan motor 10 passes through the finger guard 5 smoothly. Therefore, in the electronic or electric device 1, the inside of the housing 2 is efficiently cooled by the fan motor 10.

  The reason will be described more specifically with reference to FIG. The air discharged from the impeller 17 flows macroscopically along the axial direction of the motor. However, the direction of the airflow discharged from one blade is a direction inclined from the axial direction, that is, a direction spiraling with respect to the axial line, which is the sum of the rotational direction component and the axial direction component of the impeller 17. (Arrow F2 in FIG. 3).

  At this time, taking the ribs 52a to 52c shown in FIG. 3 as an example, the direction of the air exhausted from the blade (arrow F2) and the surface direction of the inclined surface 5c are substantially parallel to each other. The discharged air passes through the opening 50 along the inclined surface 5c. In this case, the exhaust flow passes through the gap surface s1 of the opening 50 orthogonal to the arrow F2.

  On the other hand, in the case of the conventional rib 55 having a rectangular cross section in which the portions shown by the imaginary lines in FIG. 3 are added to the ribs 52a to 52c, the air discharged from the blade has the oblique opening gap surface indicated by reference numeral s2. Pass through s2. Since the gap surface s2 is narrow, most of the exhaust flow collides with the rib 55, and a turbulent flow is generated.

  Comparing the ribs 52a to 52c with the conventional rib 55 having no inclined surface, the opening area of each of the openings 50 when viewed from the front is the same as indicated by reference numeral s3. However, the opening areas when viewed from a specific direction such as the arrow F2 are different as shown by reference numerals s1 and s2 (s1> s2). The air passing through the opening 50 has a smaller air resistance when the opening area of the surface facing the flow direction is larger. Therefore, the amount of air colliding with the ribs is small in the openings 50 formed by the ribs 52a to 52c, and the air flows smoothly. Also, turbulence generated when air collides with the ribs is reduced, and noise is reduced.

  The third feature is that the finger guard 5 has high rigidity because the two rib groups 51 and 52 intersect in a grid pattern.

  Further, a fourth feature is that the finger guards 5 have a lattice shape, so that the size of each opening 50 can be easily adjusted. That is, since the size of each opening 50 changes depending on the distance between the ribs, the protection effect of the finger guard 5 can be easily set.

  The fifth feature is that the sub-panel 4 constituting the finger guard 5 has both a function as a support member of the fan motor 10 and a function as a constituent member of the housing 2. The components of the housing 2 and the fan motor 10 are shared and the assembly is simplified.

  One of the modifications of the finger guard 5 of the present embodiment is that, as shown in FIG. 5A, the inclined surface 5c of the rib faces the outside of the opening 2a, and the side surface 5b is an airflow generated by the rotation of the fan motor 10. Has a configuration located on the downstream side. As another modified example, as shown in FIG. 5B, the rib cross section is rectangular, and the surface corresponding to the long side thereof is substantially parallel to the airflow discharged while being spirally rotated from the fan motor. Or, it is configured to be inclined in a direction along this, and to have two inclined surfaces 5c in one rib.

The above configuration has been described by taking as an example the case where the fan motor generates an exhaust flow from the inside of the housing to the outside. However, when the fan motor generates an intake air flow, that is, an air flow from the outside toward the inside of the housing, the inclined surface of the rib changes. Also in this case, the point that the fan motor is inclined in a direction substantially parallel to the air flow discharged while being spirally generated by the fan motor is the same.

-Second embodiment-
In the first embodiment, the cylindrical portion 6 surrounding the fan motor 10 is formed integrally with the sub-panel 4. However, in the second embodiment, as shown in FIG. Hereinafter, it is formed by a cylindrical member 61). As shown in FIG. 6, the tubular member 61 is similar to the tubular portion 6, but has an inclined surface 41a such that the inner peripheral end on the opening 2a side expands in diameter toward the opening 2a. The cylindrical member 61 is screwed to the sub panel 4. By providing such an inclined surface 41a, the air flowing from the fan motor 10 toward the opening 2a flows smoothly, so that the air blowing characteristics are further enhanced.

The inclined surface 41a can be formed more easily as compared with the first embodiment by configuring the cylindrical member 61 as a separate member from the sub-panel 4 as in the present embodiment -Third Embodiment-
In both the first and second embodiments, the fan motor 10 is configured to be supported by the motor support portion 11 of the finger guard 5, but in the third embodiment, the configuration in which the fan motor 10 is supported is different. That is, the fan motor 10 of the third embodiment is supported by a known housing 70 (corresponding to a frame) as shown in FIG. The housing 70 forms a motor support 72 by ribs 83 extending radially inside the cylindrical portion. As shown in FIG. 8, the side wall of the housing 2 has an opening 2a provided with the same finger guard 75 as in the first and second embodiments. That is, the outer surface of the fan motor 10 is covered by the finger guard 75. The configuration of the ribs of the finger guard 75 in FIG. 8 excluding the motor support portion is the same as in the first and second embodiments (the center circle in FIG. 8 is a portion for only attaching a nameplate).

―Comparative experiments―
The effects of the first to third embodiments have been described above, and the results of experiments performed by the inventor corresponding thereto will be described below.

  In the experiment, the electronic or electric device of the first to third embodiments and a normal electronic or electric device (comparative example) were prepared, and the air volume and noise discharged from the housing were measured. A normal electronic or electric device is an electronic or electric device having the same configuration except that the cross section of the rib of the finger guard 75 of the third embodiment is rectangular. The experimental conditions such as the number of rotations of the fan motor, the size of the housing and the opening 2a were the same.

  FIG. 9 shows measurement data of air volume and noise corresponding to the above four modes. From FIG. 9, it is clear that all of the first to third embodiments have better air volume and noise than the comparative example. Thereby, the inventor was convinced of the effects of the finger guards 5 and 75. In the first to third embodiments, the air discharged from the fan motor 10 passes only through the finger guard 5 in the first and second embodiments, but passes through the finger guard 75 and the rib 83 in the third embodiment. Therefore, the inventor has stated that the third embodiment is inferior to the first and second embodiments because, in the third embodiment, the air resistance is increased by the rib 83 and the gap between the rib 83 and the finger guard 75 is increased. Thought that it was related to that air was caught in the air. Further, the inventor has considered that the reason why the second embodiment is better than the first embodiment is related to the effect of the inclined surface 61a in the cylindrical member 61 of the second embodiment.

-Fourth embodiment-
In the fourth embodiment, as shown in FIG. 10, the fan motor 10 is supported by a dedicated housing 80 (corresponding to a frame). The housing 80 has a finger guard 82 and has substantially the same configuration as the sub-panel 4 of the first embodiment, except that the outer flange portion of the cylindrical portion 6 joined to the housing 2 is omitted. The fan motor 10 is supported by a motor support 11 at the center of the fan motor 82. The fan motor 10 can be attached to various electronic or electric devices that require a finger guard for the fan itself. Moreover, since the fan finger guard 82 is the same as that of the first embodiment, it has good airflow and noise characteristics.

-Fifth embodiment-
In the fifth embodiment, as shown in FIG. 11, the finger guard 91 includes a group of ribs that are substantially concentric with the rotation axis of the fan motor, and a group of ribs that extend radially around the rotation axis that is orthogonal to these. Thus, a mesh grid is formed. Here, a form in which a fan motor is supported separately from the finger guard of the housing as in the third embodiment will be exemplified. FIG. 11 shows a part of the housing, and is a front view of the housing viewed from the inside to the outside.

  That is, as shown in FIG. 11, the housing of the present embodiment has an opening 9a in a panel 9 constituting a part thereof, and a finger guard 91 is integrally provided here. The finger guard 91 includes a first rib group 92 composed of four ribs 92a to 92d which are annular and provided at equal intervals in a position concentric with the center of the opening 9a. A second rib group 93 composed of six ribs 93a to 93f provided at equal intervals in the circumferential direction at a position connecting the peripheral edges with a straight line, and a second rib group 93 connecting the peripheral edges of the rib 92b and the opening 9a with a straight line. A third rib group 94 composed of six ribs 94a to 94f provided at regular intervals in the circumferential direction at a position connecting each intermediate point between the ribs, and a second line connecting the rib 92d and the periphery of the opening 9a with a straight line. The fourth rib group 95 includes twelve ribs 95a to 95l provided at regular intervals in the circumferential direction at positions connecting intermediate points between the rib group 93 and the third rib group 94. The first to fourth rib groups 92, 93, 94, and 95 are integrally crossed and connected at the periphery of the opening 9a or at the ribs.

  Each of the first to fourth rib groups 92, 93, 94, and 95 has a right-angled triangular cross section, similarly to the ribs of the above embodiment. In particular, the first rib group 92 includes a surface whose diameter increases from the inside to the outside of the opening 9a (corresponding to the inclined surface 5c), a height surface on the inner diameter side, and a bottom surface outside the opening 9a. Have.

  In the second to fourth rib groups 93, 94, 95, the inclined surface is formed around the center of the opening 9a in the counterclockwise direction in FIG. 11, and the height surface is formed on the opposite side of the inclined surface. The bottom surface is formed outside the opening 9a.

  Also in this embodiment, in addition to the original protection function of the finger guard, the rib cross section of the finger guard 91 has at least one surface substantially parallel to or along the direction of the airflow discharged from the fan motor. The sloping surface prevents turbulence and achieves highly efficient cooling performance and low noise.

  Further, since the finger guard 91 has a rotationally symmetric shape with the center of the opening 9a as a base point, the rigidity of the finger guard 91 itself is high, and the flowability of the passing air is further improved.

  Further, there are six openings between the ribs 92 and between the ribs 92a and the ribs 92c, and between the ribs 92b and the ribs 92c and between the ribs 92c and the ribs 92d. 12 are formed, and 24 are formed between the rib 92d and the periphery of the opening 9a. That is, each opening has the same radial width and the number of openings on the inner diameter side is smaller than the number of openings on the outer side. Thus, the opening area of the entire finger guard 91 becomes substantially equal, and an optimal arrangement having both air circulation and a protection function is realized.

  In the fifth embodiment, the second to fourth rib groups 93, 94, 95 are linear, but may be curved as shown in FIG. 12, and the air resistance can be further reduced. Further, the fifth embodiment and this modified example are not limited to the third embodiment shown in FIG. 7, and the finger guard 91 is provided with a motor supporting portion and a cylindrical portion around the finger guard 91 as in the first embodiment shown in FIG. The present invention can be applied to a configuration integrally provided, a configuration in which a cylindrical portion is provided as a separate member as in the second embodiment shown in FIG. 6, and a configuration as in the fourth embodiment shown in FIG.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and various changes can be made without departing from the spirit of the present invention. For example, in the above embodiment, the finger guards 5, 75, and 82 have a configuration corresponding to the case where air flows in the direction of the arrow F2, and when the arrow F2 changes, the angle of the inclined surface 5c changes accordingly. Good to do. Further, the finger guards 5, 75, 82 are provided integrally with the sub-panel or the housing forming the opening, but the finger guards 5, 75, 82 may be configured as separate components from those components. Good. Further, the impeller shape of the fan motor may be another shape. Further, the electronic or electric device can be applied to various uses in which a fan motor is arranged together with a finger guard inside a casing of a computer game machine, a printer or the like in addition to the above.

FIG. 1 is a plan view illustrating an electronic or electric device according to a first embodiment of the present invention. It is principal part sectional drawing of FIG. FIG. 3 is a sectional view of a main part of FIG. 2. FIG. 3 is a plan view of a main part of FIG. 2. (A) is a principal part sectional view showing a modification of the first embodiment, and (B) is a principal part sectional view showing another modification of the first embodiment. It is principal part sectional drawing which shows the electronic or electric equipment of 2nd Embodiment of this invention. It is principal part sectional drawing which shows the electronic or electric equipment of 3rd Embodiment of this invention. It is a principal part top view of FIG. It is a graph which shows the measurement data which shows the experimental result of 1st-3rd embodiment. It is sectional drawing which shows the fan motor of 4th Embodiment of this invention. It is a principal part sectional view showing electronic or electric equipment of a 5th embodiment of the present invention. It is a principal part top view which shows the modification of 5th Embodiment. (A) and (B) are plan views showing a known finger guard.

Explanation of reference numerals

2 Housing 4 Sub-panel 5, 75, 82, 91 Finger guard 5a Bottom surface 5b Side surface 5c Inclined surface 10 Fan motor 14 Armature 17 Impeller 19 Rotor magnet 51, 92 First rib group 52, 93 Second rib group 94 Third Rib group 95 Fifth rib group 51a to 51f, 52a to 52c, 92a to 92d, 93a to 93f, 94a to 94f, 95a to 95l Rib

Claims (13)

A rotor having a magnet, an impeller blade fixed to the rotor, a stator fixed to a position facing the rotor magnet, and a frame for fixing and holding the stator and forming an outer frame of the fan motor. In the cooling fan motor,
Having a guard plate covering the outer surface of the frame and fixed to the frame,
A mesh grid is formed on the guard plate by ribs extending in at least two directions, intersections of the ribs are fixed to each other, and the ribs have at least one inclination with respect to a cross-sectional shape perpendicular to the direction in which the ribs extend. A fan having a side, and the inclined side having a guard plate inclined substantially parallel to or along a direction of an air flow generated at a position of the rib by rotation of an impeller blade of a fan motor. motor. The guard plate for a fan motor according to claim 1,
A fan motor, wherein the mesh grid formed by the ribs extending in at least two directions is at least sized so that a human finger cannot enter. A guard plate for a fan motor according to claim 1,
The fan motor, wherein the guard plate is formed by a group of ribs extending in two directions substantially orthogonal to each other. The guard plate for a fan motor according to any one of claims 1 to 3,
The guard plate is formed by a plurality of rib groups that are substantially concentric with respect to the rotation axis of the fan motor and a plurality of ribs that extend radially around the rotation axis that is substantially orthogonal thereto. Fan motor. The guard plate for a fan motor according to any one of claims 1 to 4,
A fan motor, wherein the cross-section of the rib is a right-angled triangle, and the hypotenuse of the rib is substantially parallel to or parallel to the direction of airflow generated by rotation of the fan motor. The guard plate for a fan motor according to any one of claims 1 to 5,
A fan, wherein the rib has a rectangular cross section, and two long sides of the rectangle are both substantially parallel to a direction of an airflow generated by rotation of a fan motor or inclined in a direction along the direction. motor. A rotor having a magnet, an impeller blade fixed to the rotor, a stator fixed to a position facing the rotor magnet, and a frame for fixing and holding the stator and forming an outer frame of the fan motor. In the housing of an electronic or electrical device that incorporates a cooling fan motor,
A guard plate covering an outer surface of the cooling fan motor and fixed to the housing,
A mesh grid is formed on the guard plate by ribs extending in at least two directions, intersections of the ribs are fixed to each other, and the ribs have at least one inclination with respect to a cross-sectional shape perpendicular to the direction in which the ribs extend. A housing having a side, wherein the inclined side has a guard plate which is substantially parallel to or inclining in a direction of an air flow generated at a position of the rib by rotation of an impeller blade of a fan motor. body. The guard plate for a fan motor provided in the housing according to claim 7,
The housing according to claim 1, wherein the mesh grid formed by the ribs extending in at least two directions has a guard plate that is at least sized so that a human finger cannot enter. The guard plate for a fan motor provided in the housing according to claim 7 or 8,
The housing according to claim 1, wherein the guard plate includes a guard plate formed by a group of ribs extending in two directions substantially orthogonal to each other. The guard plate for a fan motor provided in the housing according to any one of claims 7 to 9,
The guard plate includes a plurality of rib groups that are substantially concentric with respect to the rotation axis of the fan motor, and a plurality of ribs that extend radially about the rotation axis that is substantially orthogonal thereto. A housing characterized by the above. The guard plate for a fan motor provided in the housing according to any one of claims 7 to 10,
A housing characterized in that the rib has a cross-sectional shape of a right triangle, and a guard plate whose hypotenuse is inclined substantially parallel to or along the direction of the airflow generated by the rotation of the fan motor. . The guard plate for a fan motor provided in the housing according to any one of claims 7 to 11,
The cross-sectional shape of the rib is a rectangle, and the two long sides of the rectangle each have a guard plate that is inclined substantially in parallel to or along the direction of the airflow generated by the rotation of the fan motor. Characteristic housing.   An electronic or electric device, wherein a cooling fan motor is installed at a predetermined position in the housing according to any one of claims 7 to 12.

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