Electrical device

Abstract

To provide an electric device having a louver capable of preventing vibration of a blade itself due to a wind flow.SOLUTION: An electrical device including a substrate on which a plurality of devices including passive and active elements are mounted, comprises: a cooling fan that is attached to the electrical device near an air inlet provided in the electrical device so as to be able to draw in air or near an air outlet provided in the electrical device so as to be able to exhaust air; a frame that is attached to the cooling fan and has an opening through which air passes; and a blade that has a rotating shaft supported by a bearing portion of the frame within the opening. The blade has a ferromagnetic portion that extends radially from the rotating shaft and rotates together with the blade. The frame has an electromagnet fixed to a portion around the rotating shaft of the bearing portion so as to face the ferromagnetic portion. The electrical device includes energizing means that energizes the cooling fan and the electromagnet in synchronization with each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electric device, and more particularly to a structure for preventing blades from falling off of a fan having louvers for preventing backflow to the intake side of the electric device. [Background technology]

[0002] Generally, conventional louvered fans have multiple blades 2 installed on the intake side of the fan 1, as shown in Figure 13. Note that blade 2 refers to a single blade attached to the blade mounting plate 3 of the louver. When the fan 1 is stopped, the blades 2 hang down at an angle parallel to the direction of gravity, so that the blades 2 function as a lid to prevent backflow to the intake side, and when the fan 1 starts, as shown in Figure 14, the blades 2 rotate under pressure from the wind generated by the negative pressure of the fan 1, opening the louvers.

[0003] Furthermore, a louvered fan is disclosed in Patent Document 1, which is an electrical device having a circuit board on which multiple devices including passive and active elements are mounted, and has a structure in which a motor is provided as a rotation mechanism to automatically open and close the louver blades. Patent Document 1 describes an electrical device that can efficiently cool devices that become hot among multiple devices arranged on a circuit board. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-019236 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the device with the above configuration, there is no mechanism for maintaining the rotation angle of the blade 2, and therefore, as shown in Figure 15, when the fan 1 takes in air, turbulence occurs around the blade 2, making the air flow unstable, causing the blade 2 itself to vibrate.As a result, as shown in Figure 16, the rotation shaft 4 of the blade 2 and the bearing part 5 of the blade mounting plate 3 wear out, causing the blade 2 to fall off, and the blade 2 gets caught in the fan 1, damaging it.

[0006] Furthermore, the structure for adjusting the rotation angle of the blades as disclosed in Patent Document 1 requires components such as wires to be attached to each blade, springs to hold them, a motor for adjusting the rotation angle, and a control circuit, which creates a problem in that the mechanism becomes complicated, which could increase the size of the device and significantly increase costs.

[0007] The present invention has been made in consideration of the above points, and an example of an object thereof is to provide an electrical device having louvers that can prevent vibration of the blades themselves due to the flow of intake air. [Means for solving the problem]

[0008] The electrical device of the present invention is an electrical device including a substrate on which a plurality of devices including passive elements and active elements are mounted, a cooling fan attached to the electrical device so as to be able to take in air near an air inlet provided in the electrical device or to be able to exhaust air near an air outlet provided in the electrical device, and a frame attached to the cooling fan and having an opening through which air passes; a blade having a rotation shaft supported by a bearing portion of the frame body within the opening, the blade has a ferromagnetic portion extending radially from the rotation shaft and rotating together with the blade, the frame body has an electromagnet fixed to a part around the rotation axis of the bearing part so as to face the ferromagnetic part, The electrical device is characterized by having a current-carrying means for energizing the cooling fan and the electromagnet in synchronization. [Effects of the Invention]

[0009] According to the present invention, as soon as the fan starts operating, the electromagnet attracts the metal part, stopping the rotation of the rotating shaft and maintaining the blade at a predetermined angle, thereby preventing the blade itself from vibrating due to the wind flow and preventing the blade from falling off. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic perspective view showing an example of the configuration of a louvered fan for electrical equipment according to a first embodiment of the present invention. [Figure 2] 2 is an enlarged partial perspective view showing the area within the dashed double-dashed line frame AA shown in FIG. 1. FIG. [Figure 3] FIG. 2 is a front view showing a state in which the louvered fan of the electrical device of the first embodiment is stopped. [Figure 4] 4 is a partially enlarged cross-sectional view showing one set of bearing parts and a rotating shaft taken along line AA in FIG. 3. FIG. [Figure 5] 1 is a front view showing a state immediately after start-up of the louvered fan of the electrical device of the first embodiment. FIG. [Figure 6] 6 is a partially enlarged cross-sectional view showing one set of bearing parts and a rotating shaft taken along line BB shown in FIG. 5. FIG. [Figure 7] 1 is a front view showing a state in which the louvered fan of the electrical device of the first embodiment is in operation. FIG. [Figure 8] 8 is a partially enlarged cross-sectional view showing one set of bearing parts and a rotating shaft taken along line CC shown in FIG. 7. FIG. [Figure 9] FIG. 10 is an enlarged partial cross-sectional view taken along the blade mounting plate, showing a pair of bearings and a rotation shaft of a louvered fan for electrical equipment according to a second embodiment of the present invention, in operation. [Figure 10] FIG. 10 is a partially enlarged cross-sectional view taken along the blade mounting plate, showing a pair of bearings and a rotating shaft of the louvered fan of the electrical equipment according to the modified example of the first embodiment of the present invention, during operation. [Figure 11]FIG. 10 is a partially enlarged cross-sectional view taken along the blade mounting plate, showing a pair of bearings and a rotating shaft of the louvered fan of the electrical equipment according to the modified example of the first embodiment of the present invention, during operation. [Figure 12] FIG. 10 is a partially enlarged cross-sectional view taken along the blade mounting plate, showing a pair of bearings and a rotating shaft of the louvered fan of the electrical equipment according to the modified example of the first embodiment of the present invention, during operation. [Figure 13] FIG. 10 is a cross-sectional view showing the schematic configuration of a conventional louvered fan when stopped. [Figure 14] FIG. 10 is a cross-sectional view showing the schematic configuration of a conventional louvered fan during operation. [Figure 15] FIG. 1 is a schematic cross-sectional view showing a cross section of one blade of a conventional louvered fan during operation. [Figure 16] 1 is a schematic cross-sectional view showing wear of the bearings of the blade rotation shaft and the blade mounting plate of a conventional louvered fan. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, electric devices according to embodiments of the present invention will be described with reference to the drawings. In the embodiments, components having substantially the same functions and configurations are designated by the same reference numerals, and redundant description will be omitted.

[0012] (First Example) (Configuration explanation) FIG. 1 showing the first embodiment is an overall view of a louvered fan YF, and FIG. 2 shows the detailed structure of the main part of this embodiment.

[0013] The cooling fan 11 (cooling fan) side of the louvered fan YF shown in FIG. 1 is attached near an air intake port provided in an electrical device (not shown) that includes a board on which multiple devices, including passive and active elements, are mounted so as to be able to draw in air. The cooling fan 11 side then blows air toward the board (not shown). Alternatively, the frame 13 side attached to the air intake side of the fan 11 and through which air passes is attached near an air exhaust port provided in an electrical device (not shown) that includes a board on which multiple devices, including passive and active elements, are mounted so as to be able to exhaust air. The cooling fan 11 side then blows air toward the outside of the electrical device (not shown). Alternatively, one louvered fan YF may be attached near an air intake port provided in the electrical device (not shown) so as to be able to draw in air, and the other louvered fan YF may be attached near an air exhaust port so as to be able to exhaust air.

[0014] As shown in Figure 1, four identical blades 12 are rotatably attached in parallel to the blade mounting plate 13 to bearing portions 15 inside the opening of a frame 13 (hereinafter referred to as the blade mounting plate 13) that is attached to the intake side of the fan 11 and through which air passes. The blades 12 and blade mounting plate 13 are molded from a non-magnetic material such as a resin material.

[0015] 2 is an enlarged view of the bearing portion 15 around the rotation shaft 14 of the blade 12 within the two-dot chain frame AA shown in Fig. 1. However, Fig. 2 is an enlarged partial perspective view showing the state in which the bearing portion 15 and the rotation shaft 14 are separated from each other before the rotation shaft 14 of the blade 12 is attached to the bearing portion 15 of the blade mounting plate 13.

[0016] The blade 12 is attached to be rotatable around a rotation shaft 14 supported by a bearing portion 15 of the blade mounting plate 13 within the opening. A magnetic metal portion 16 (a plate-shaped ferromagnetic portion extending from the rotation shaft 14 to the blade 12) made of iron, cobalt, nickel, or a ferromagnetic material containing these is fixed to the rotation shaft 14. The metal portion 16 extends radially from the rotation shaft 14 and rotates together with the blade 12. The metal portion 16 extends from the rotation shaft 14 along the blade 12, for example, in parallel.

[0017] An electromagnet 17 is built into the blade mounting plate 13 near the bearing portion 15. The electromagnet 17 is fixed to a part of the circumference of the rotation shaft 14 of the bearing portion 15 so as to face the metal portion 16. A fan-shaped recess that accommodates the rotating electromagnet 17 is provided in the blade mounting plate 13 around the rotation shaft 14 of the bearing portion 15. The electromagnet 17 is fixed so that the metal portion 16 is attracted to the horizontal wall surface of the fan-shaped recess (see FIG. 8).

[0018] Electric power is supplied to this electromagnet 17 in synchronization with the fan 11 through wiring 18 shown by a dashed line built into the blade mounting plate 13. The wiring 18 passes through a wiring outlet 19 located at the top of the blade mounting plate 13 in Fig. 1 and is connected to the same power supply (not shown) as the fan 11 via, for example, a connector SC. The current-carrying means including the wiring 18 and the power supply are designed so that the electromagnet 17 is synchronized with the ON / OFF of the fan 11.

[0019] (Explanation of operation) First, Figures 3 and 4 show the state when fan 11 is stopped, with Figure 3 being a front view of the device and Figure 4 being an enlarged view of the blades in Figure 3. In Figure 4, blade 12 is at a rotation angle parallel to the direction of gravity, blocking the intake side of fan 11 (the left side of blade 12).

[0020] Next, Figures 5 and 6 are diagrams showing the state immediately after fan 11 is started, with Figure 5 being a front view of the device and Figure 6 being an enlarged view of the blade in Figure 5. In Figure 6, when fan 11 starts, negative pressure generated by fan 11 causes air (indicated by the dashed arrow) to flow from the intake side of blade 12, and the air hits the front surface of blade 12, increasing the rotation angle. At this time, power is supplied to electromagnet 17 built into blade mounting plate 13, and magnetic force is generated in electromagnet 17 at the same time as blade 12 starts to rotate.

[0021] Figures 7 and 8 are diagrams showing the state of the fan while it is operating, with Figure 7 being a front view of the device and Figure 8 being an enlarged view of the blade in Figure 7. In Figure 8, when the rotation angle of blade 12 approaches 90° with respect to the direction of gravity, electromagnet 17 and metal part 16 fixed to rotation shaft 14 of blade 12 attract each other by magnetic force, and the rotation angle of blade 12 is maintained horizontal. After that, when fan 11 stops again, blade 12 rotates at an angle parallel to the direction of gravity as shown in Figure 4, blocking the intake side of fan 11.

[0022] (Explanation of effect) As described above, according to the first embodiment, even if the airflow around the blade 12 becomes unstable, the metal part 16 and the electromagnet 17 attract each other by magnetic force while the fan 11 is operating, thereby maintaining the rotation angle of the blade 12. This suppresses wear on the rotation shaft 14 and the bearing part 15, thereby preventing the blade 12 from falling off.

[0023] (Second Example) FIG. 9 is a partially enlarged cross-sectional view taken along the blade mounting plate, showing a pair of bearings and a rotating shaft of the louvered fan of the electric equipment according to the second embodiment of the present invention, during operation.

[0024] In the first embodiment, there are multiple blades 12, an electromagnet 17 is provided for each metal part 16, and multiple wirings 18 are used to connect multiple (four) electromagnets 17 and energize them in synchronization, but in the second embodiment, a louvered fan is provided in which the electromagnets 17 have fewer sets of metal parts 16.

[0025] As shown in Figure 9, there are multiple blades 12, but it is possible to modify the structure to reduce the number of electromagnets 17 by providing only the top blade 12 with a set of electromagnet 17 on the blade mounting plate 13 side and metal part 16 on the blade 12 side, and connecting the blades 12 with wires WR and connecting parts CB, etc., to link their operations.

[0026] Thus, in the second embodiment, at least some of the blades 12 are provided at their ends closer to the pivot axis 14 with a link mechanism wire WR and connecting part CB that links to the remaining parts of the blades 12, and when at least some of the blades 12 are rotated, the electromagnet 17 and metal part 16 simultaneously rotate the remaining parts of the blades 12.

[0027] According to the second embodiment, it is possible to provide a louvered fan in which the number of pairs of electromagnets 17 on the blade mounting plate 13 and metal parts 16 on the blades 12 in the louvers 10 is reduced.

[0028] (Description of Modifications) 10, 11 and 12 are partially enlarged cross-sectional views taken along the blade mounting plate, showing a pair of bearings and a rotating shaft of a louvered fan for electrical equipment according to a modified example of the first embodiment of the present invention, during operation.

[0029] In the first embodiment, the metal part 16 of the blade 12 extends from the pivot shaft 14 along the blade 12, for example, parallel to it. However, in the present invention, the configuration of the set of the electromagnet 17 of the blade mounting plate 13 and the metal part 16 of the blade 12 can also be applied in which they are arranged rotationally symmetrically around the center of the pivot shaft 14.

[0030] For example, in this modified example, the electromagnet 17 and the metal part 16 may be arranged rotationally symmetrically by rotating 90 degrees around the rotation axis 14 from the positions of the electromagnet 17 and the metal part 16 in the first embodiment, as shown in FIG.

[0031] For example, in this modified example, the electromagnet 17 and the metal part 16 may be arranged rotationally symmetrically by rotating 180 degrees around the rotation axis 14 from the positions of the electromagnet 17 and the metal part 16 in the first embodiment, as shown in FIG.

[0032] For example, in this modified example, the electromagnet 17 and the metal part 16 may be arranged rotationally symmetrically by rotating 270 degrees around the rotation axis 14 from the positions of the electromagnet 17 and the metal part 16 in the first embodiment, as shown in FIG. 12.

[0033] As shown in FIGS. 10 and 12, the metal portion 16 of the blade 12 may extend from the pivot shaft 14 to stand upright relative to the blade 12, for example, perpendicularly.

[0034] According to this modification, the electromagnet 17 on the blade mounting plate 13 side and the metal part 16 on the blade 12 side are arranged rotationally symmetrically around the center of the rotation shaft 14, thereby increasing the degree of freedom in their arrangement.

[0035] In addition to being attached to the intake side of the fan 11 so that the airflow drawn into the fan 11 passes through, the vane mounting plate 13 can also be attached to the exhaust side of the fan 11 so that the airflow blown by the fan 11 passes through.

[0036] In the above embodiment, an example was described in which the device is applied to an apparatus in which the louver 10 and the fan 11 are integrated, but even if the fan 11 and the louver 10 are separate parts, the device can be applied by synchronizing the ON / OFF of the fan 11 with the electromagnet 17 built into the louver 10.

[0037] Thus, according to the above-described embodiment and modified example, in the louvered fan, the rotating shaft of the blade has a metal part, and electromagnet 17 is built in around the bearing on the blade mounting plate side. When the rotation angle of louver 10 reaches a predetermined angle after the fan starts, the metal part of the rotating shaft and electromagnet 17 attract each other, and the rotation angle is maintained by magnetic force, thereby providing a blade falling-off prevention structure. [Explanation of symbols]

[0038] 10 louvers 11 Fan 12 wainscot 13. Blade mounting plate (frame) 14 Rotating shaft 15 Bearing section 16 Metal part (ferromagnetic part) 17 Electromagnet 18 Wiring

Claims

1. An electrical device including a substrate on which a plurality of devices including passive elements and active elements are mounted, a cooling fan attached to the electrical device so as to be able to take in air near an air inlet provided in the electrical device or to be able to exhaust air near an air outlet provided in the electrical device, and a frame attached to the cooling fan and having an opening through which air passes; a blade having a rotation shaft supported by a bearing portion of the frame body within the opening, the blade has a ferromagnetic portion extending radially from the rotation shaft and rotating together with the blade, the frame body has an electromagnet fixed to a part around the rotation axis of the bearing part so as to face the ferromagnetic part, The electric device is characterized in that it has a current-carrying means for energizing the cooling fan and the electromagnet in synchronization with each other.

2. 2. The electric device according to claim 1, wherein the blades are plural, the electromagnets are provided for the respective ferromagnetic portions, and the current-carrying means connects the electromagnets by a plurality of wires.

3. The electrical device described in claim 1, characterized in that there are multiple blades, and at least some of the blades are provided with a link mechanism at an end closer to the pivot axis that links to the remaining blades, and when at least some of the blades are rotated, the electromagnet and the ferromagnetic part simultaneously rotate the remaining blades.

4. The ferromagnetic portion extends from the rotation shaft along the blade.

2. The electrical device according to claim 1.

5. The ferromagnetic portion extends from the rotation shaft so as to rise up relative to the blade.

2. The electrical device according to claim 1.

6. The electrical device according to claim 1, wherein the frame is attached to an intake side of the cooling fan so that the airflow drawn into the cooling fan passes through the frame.

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