Dust-proof structure

Abstract

The dustproof structure of the embodiment includes a housing and a magnetic component. The housing accommodates an electrical device. The magnetic component is magnetized. The magnetic component is arranged in a flow path of gas flowing through a vent formed in the housing.

Description

Technical Field

[0001] An embodiment of the present invention relates to a dustproof structure. Background Art

[0002] Conventionally, there is a control cabinet including a housing having an air intake port and an air exhaust port through which cooling air flows. The control cabinet cools the heat source inside the housing using the cooling air introduced from outside the housing.

[0003] However, if conductive fine particles enter the interior of the housing along with the cooling air, there is a possibility that electrical equipment inside the control cabinet may suffer from abnormalities such as short circuits.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2016-111194 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] An object of the present invention is to provide a dustproof structure capable of suppressing the intrusion of conductive foreign matter into the interior of a housing.

[0009] Means for solving problems

[0010] The dustproof structure of the embodiment includes a housing and a magnetic component. The housing accommodates an electrical device. The magnetic component is magnetized. The magnetic component is arranged in a flow path of gas flowing through a vent formed in the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view of the dustproof structure according to the embodiment.

[0012] Figure 2 This is an exploded perspective view of the dustproof structure according to the embodiment.

[0013] Figure 3 This is a cross-sectional view showing the front portion of the dustproof structure according to the embodiment, taken along a cross section parallel to the XZ plane.

[0014] Figure 4 This is an exploded perspective view of the front portion of the dustproof structure in a modified example of the embodiment. DETAILED DESCRIPTION

[0015] Hereinafter, a dustproof structure according to an embodiment will be described with reference to the drawings.

[0016] Figure 1 It is a perspective view of the dustproof structure 10 according to the embodiment. Figure 2It is an exploded perspective view of the dustproof structure 10 according to the embodiment. Figure 3 This is a cross-sectional view showing the front portion of the dustproof structure 10 according to the embodiment, cut along a cross section parallel to the XZ plane.

[0017] Hereinafter, the directions of the mutually orthogonal X-axis, Y-axis, and Z-axis in three-dimensional space are directions parallel to the respective axes. For example, the front-to-back direction of the dustproof structure 10 is parallel to the X-axis direction. The positive direction of the X-axis direction is the direction from the rear to the front of the dustproof structure 10. The left-to-right direction of the dustproof structure 10 is parallel to the Y-axis direction. The positive direction of the Y-axis direction is the direction from the right to the left of the dustproof structure 10. The up-down direction and vertical direction of the dustproof structure 10 are parallel to the Z-axis direction. The positive direction of the Z-axis direction is the direction from the bottom to the top of the dustproof structure 10.

[0018] like Figure 1 As shown, the dustproof structure 10 of the embodiment is installed in various cabinets 1 included in electrical equipment. Cabinets 1 include, for example, distribution cabinets, distribution cabinets, and control cabinets that constitute power conversion devices, power supply devices, and motor drive devices. Cabinets 1 include various electrical equipment 2, such as transformers, switches, disconnectors, measuring instruments, and control devices.

[0019] like Figure 1 、 Figure 2 and Figure 3 As shown, the dust-proof structure 10 includes a shell 11, a cover part 12, a plurality of permanent magnets 13, a magnetic material filter 14 (an example of a magnetic part, a first magnetic part in the claims), an air filter (an example of a filter part in the claims) 15 and a magnetic material shield 16 (an example of a second magnetic part in the claims).

[0020] The housing 11 houses various electrical devices 2. The housing 11 includes a fan 22 fixed to an upper portion 21. The fan 22 is arranged to close an exhaust port 23 that passes through the upper portion 21 of the housing 11. The exhaust port 23 is, for example, a rectangular opening.

[0021] An air intake port 25 is formed in the front portion 24 of the housing 11. The air intake port 25 is disposed so as to face the electrical device 2 in the X-axis direction, for example. The air intake port 25 is, for example, a rectangular opening.

[0022] The fan 22 draws air from outside the housing 11 into the interior through an air intake 25 in a front portion 24 of the housing 11 and exhausts the air from inside the housing 11 to the outside through an air exhaust 23 in an upper portion 21 of the housing 11. The fan 22 uses the air flowing inside the housing 11 to cool the electrical device 2.

[0023] The outer shape of the cover member 12 is, for example, a rectangular box shape. The cover member 12 is formed of a non-magnetic material such as synthetic resin that is not magnetized by a magnetic field.

[0024] The cover member 12 is fixed to the surface 24A of the front portion 24 of the housing 11. The cover member 12 covers the air inlet 25 from the outside of the housing 11.

[0025] A vent 32 is formed in most of the front portion 31 of the cover member 12. The vent 32 faces the air intake port 25 in the X-axis direction, for example. The vent 32 is, for example, a rectangular opening.

[0026] The cover member 12 includes a plurality of fixing members 33 for fixing the plurality of permanent magnets 13 to the housing 11 in a non-contact manner. The outer shape of each of the plurality of fixing members 33 is, for example, a rib-shaped protrusion.

[0027] The plurality of fixing members 33 are, for example, two pairs of fixing members 33. For example, each pair of the two pairs of fixing members 33 is spaced apart from one of the left and right ends (the ends in the Y-axis direction) of the back surface 31A of the front portion 31 of the cover member 12 by a predetermined distance in the X-axis direction. Each pair of the two pairs of fixing members 33 is a pair of fixing members 33 that protrudes inward in the Z-axis direction from the back surfaces 34A and 35A of the upper portion 34 and lower portion 35 of the cover member 12, respectively.

[0028] Each of the plurality of permanent magnets 13 has a rectangular prism-shaped rod shape, for example. The plurality of permanent magnets 13 is, for example, a pair of permanent magnets 13. For example, the pair of permanent magnets 13 is fixed to the left and right ends (the ends in the Y-axis direction) of the back surface 31A of the front portion 31 of the cover member 12 by two pairs of fixing members 33. Each permanent magnet 13 is fixed to or released from the pair of fixing members 33 by, for example, sliding in the Y-axis direction.

[0029] The pair of permanent magnets 13 magnetizes the magnetic filter 14 by a magnetic field. The pair of permanent magnets 13 fixes the magnetic filter 14 to the cover member 12 by a magnetic force.

[0030] The pair of permanent magnets 13 can be easily removed from the cover member 12 by releasing the fixation thereof to the cover member 12 during maintenance work or the like.

[0031] For example, even if there is conductive foreign matter attached to the cover member 12 by the magnetic field of the pair of permanent magnets 13 , the conductive foreign matter can be easily recovered by removing the pair of permanent magnets 13 from the cover member 12 .

[0032] The outer shape of the magnetic filter 14 is, for example, a rectangular lattice or mesh shape in which a plurality of through-holes 14a are formed. The magnetic filter 14 is formed of a ferromagnetic material such as iron.

[0033] Magnetic filter 14 is fixed to surface 31B of front portion 31 of cover member 12 by the magnetic force of a pair of permanent magnets 13. Magnetic filter 14 covers vent 32 of cover member 12. Magnetic filter 14 is released from its fixation to cover member 12 by an external force opposing the magnetic force of the pair of permanent magnets 13.

[0034] Magnetic filter 14 is magnetized by the magnetic field of the pair of permanent magnets 13. Magnetic filter 14 separates and captures conductive dust and other foreign matter from air passing through multiple through-holes 14a toward vent 32 of cover member 12 and air inlet 25 of housing 11.

[0035] Magnetic filter 14 is arranged outside housing 11 to prevent conductive foreign matter from entering housing 11 through air inlet 25 .

[0036] The magnetic filter 14 is demagnetized by the pair of permanent magnets 13 by releasing it from the cover member 12 during maintenance work, for example. Conductive foreign matter captured by the magnetized magnetic filter 14 is easily separated from the demagnetized magnetic filter 14 and can therefore be easily recovered.

[0037] The magnetization of the magnetic filter 14 is gradually eliminated as the magnetic filter 14 separates from the pair of permanent magnets 13 . This prevents the conductive foreign matter captured by the magnetic filter 14 from being scattered into the air.

[0038] The air filter 15 has a rectangular mesh shape with a plurality of through holes, for example, and is made of a non-magnetic material such as synthetic resin that is not magnetized by a magnetic field.

[0039] The air filter 15 is sandwiched and fixed from both sides in the X-axis direction by, for example, the front portion 24 of the housing 11 and the magnetic shield 16. The air filter 15 covers the air inlet 25 from the inside of the housing 11.

[0040] The air filter 15 separates and captures foreign matter from the air flowing into the housing 11 from the air inlet 25 and passing through the plurality of through holes. The air filter 15 separates and captures foreign matter that cannot be removed by the magnetic filter 14, such as non-conductive dust.

[0041] The outer shape of the magnetic material shield 16 is, for example, a rectangular lattice or mesh shape with a plurality of through holes 16a formed therein. The magnetic material shield 16 is formed of a ferromagnetic material such as iron.

[0042] Magnetic shield 16 is fixed to rear surface (inner surface) 24B of front portion 24 of housing 11. Magnetic shield 16 is fixed to housing 11 using fixings such as screws. Magnetic shield 16 and air filter 15 cover air inlet 25 from inside housing 11.

[0043] The magnetic shield 16 allows air flowing from the air filter 15 into the plurality of through-holes 16a to pass into the interior of the housing 11. The magnetic shield 16 magnetically blocks magnetic contact between the magnetic filter 14 and the pair of permanent magnets 13 and the electrical equipment 2 inside the housing 11. The magnetic shield 16 shields the electrical equipment 2 inside the housing 11 from the magnetic contact of the magnetic filter 14 and the pair of permanent magnets 13.

[0044] According to the embodiment described above, the dust-proof structure 10 has a magnetic material filter 14, which covers the flow path of air flowing through the air intake 25 formed in the shell 11, namely the vent 32 of the cover part 12, thereby suppressing the intrusion of conductive dust and other foreign matter into the interior of the shell 11.

[0045] Dust-proof structure 10 includes a pair of permanent magnets 13. These magnets magnetize magnetic filter 14 and secure it to cover member 12 through magnetic force. This allows magnetic filter 14 to be demagnetized when the magnetization is released. Conductive foreign matter captured by magnetized magnetic filter 14 is easily separated from demagnetized magnetic filter 14, allowing for easy recovery. The magnetization of magnetic filter 14 gradually disappears as it separates from the pair of permanent magnets 13, preventing conductive foreign matter captured by magnetic filter 14 from being dispersed into the air.

[0046] The dustproof structure 10 includes two pairs of fixing members 33 for fixing the pair of permanent magnets 13 to the cover member 12, thereby enabling the pair of permanent magnets 13 to be easily removed from the cover member 12. For example, even if there is conductive foreign matter attached to the cover member 12 due to the magnetic field of the pair of permanent magnets 13, the conductive foreign matter can be easily recovered by removing the pair of permanent magnets 13 from the cover member 12.

[0047] The dustproof structure 10 includes an air filter 15 inside the housing 11 , thereby separating and capturing foreign matter that cannot be removed by the magnetic filter 14 , such as non-conductive dust, from the air flowing into the housing 11 from the air intake 25 .

[0048] The dustproof structure 10 includes a magnetic shield 16 inside the housing 11, thereby isolating the magnetic field between the magnetic filter 14 and the pair of permanent magnets 13 and the electrical device 2 inside the housing 11. The magnetic shield 16 is able to shield the electrical device 2 inside the housing 11 from the magnetic field of the magnetic filter 14 and the pair of permanent magnets 13.

[0049] Modifications will be described below.

[0050] In the above embodiment, the magnetic filter 14 covers the vent 32 of the front portion 31 of the cover member 12 , but the present invention is not limited thereto. The magnetic filter 14 may cover vents formed in other locations other than the front portion 31 of the cover member 12 .

[0051] Figure 4 It is an exploded perspective view of the front portion of a dustproof structure 10A in a modified example of the embodiment.

[0052] like Figure 4 As shown, a modified dustproof structure 10A includes a modified cover member 12A, a plurality of permanent magnets 13A, and a plurality of magnetic filters 14A, which are different from the cover member 12, the plurality of permanent magnets 13, and the magnetic filter 14 of the above-described embodiment.

[0053] The outer shape of the cover member 12A of the modified example is formed into a rectangular box shape, for example. The cover member 12A of the modified example is formed of a non-magnetic material such as synthetic resin that is not magnetized by a magnetic field. The cover member 12A includes, for example, a shielding portion 41 and a support portion 42.

[0054] The shielding portion 41 has an outer shape of, for example, a rectangular plate. The shielding portion 41 covers the air inlet 25 in the X-axis direction. The shielding portion 41 is separated from the surface 24A of the front portion 24 of the housing 11 by a predetermined distance in the X-axis direction. At least a portion of the shielding portion 41 overlaps the entire area of ​​the air inlet 25 when viewed in the X-axis direction.

[0055] The outer shape of the support portion 42 is, for example, a rectangular tube. The support portion 42 is integrated with the shielding portion 41. The support portion 42 is fixed to the peripheral edge of the air inlet 25 on the surface 24A of the front portion 24 of the housing 11.

[0056] The support portion 42 is formed with a plurality of vents 43 penetrating in the Y-axis direction and the Z-axis direction. The plurality of vents 43 are, for example, four vents 43 in total, two vents in each axial direction.

[0057] The multiple permanent magnets 13A of the modified example each have a rectangular prism-shaped rod shape, for example. The multiple permanent magnets 13A are, for example, four permanent magnets 13A. For example, the four permanent magnets 13A are secured to the four corners of the back surface of the support portion 42 of the cover member 12A via multiple securing members. The four corners are the left and right ends of the upper end and the left and right ends of the lower end of the back surface of the support portion 42. The multiple securing members are, for example, rib-shaped protrusions protruding from the back surface of the support portion 42.

[0058] The four permanent magnets 13A magnetize the four magnetic filters 14A by a magnetic field, and the four permanent magnets 13A fix the four magnetic filters 14A to the support portion 42 of the cover member 12A by a magnetic force.

[0059] The outer shape of each of the plurality of magnetic filters 14A of the modified example is, for example, a rectangular lattice or mesh shape in which a plurality of through-holes 14a are formed. Each magnetic filter 14A is formed of a ferromagnetic material such as iron.

[0060] The plurality of magnetic filters 14A are, for example, four magnetic filters 14A covering the four vents 43 of the support portion 42 of the cover member 12A. Each of the four magnetic filters 14A is fixed to the surface of the support portion 42 of the cover member 12A by the magnetic force of a suitable adjacent pair of permanent magnets 13A among the four permanent magnets 13A. Each magnetic filter 14A is released from its position relative to the cover member 12A by an external force opposing the magnetic force of the suitable pair of permanent magnets 13A.

[0061] Each of the four magnetic filters 14A is magnetized by the magnetic field of a suitable pair of permanent magnets 13A. Each magnetic filter 14A separates and captures conductive dust and other foreign matter from air passing through the plurality of through-holes 14a toward the vents 43 of the support portion 42 of the cover member 12A and the air inlet 25 of the housing 11.

[0062] In the above embodiment, the magnetic filter 14 is arranged outside the housing 11 , but the present invention is not limited thereto. The magnetic filter 14 only needs to be arranged in the flow path of the air flowing through the air inlet 25 formed in the housing 11 .

[0063] For example, the magnetic filter 14 may be disposed inside the housing 11. For example, the cover member 12 to which the pair of permanent magnets 13 are fixed may be fixed to the back surface 24B of the front portion 24 of the housing 11. The cover member 12 covers the air inlet 25 from inside the housing 11. The magnetic filter 14 is fixed to the cover member 12 inside the housing 11 by the magnetic force of the pair of permanent magnets 13, covering the air vent 32 of the cover member 12.

[0064] In the above-described embodiment, the cover member 12 fixes the plurality of permanent magnets 13 using the plurality of fixing members 33 which are rib-shaped protrusions, but the present invention is not limited thereto.

[0065] Each fixing member 33 may be, for example, a fixing member such as a screw or an adhesive tape.

[0066] In the above-described embodiment, the magnetic filter 14 and the plurality of permanent magnets 13 are fixed directly to the cover member 12 without contact, but the present invention is not limited thereto.

[0067] For example, the magnetic filter 14 and the plurality of permanent magnets 13 may be fixed to the cover member 12 in direct contact with each other by magnetic force.

[0068] For example, at least one of the magnetic filter 14 and the plurality of permanent magnets 13 may not be released from being fixed to the cover member 12 .

[0069] For example, the cover member 12 may be omitted, and the magnetic filter 14 and the plurality of permanent magnets 13 may be fixed to the housing 11 in direct contact with each other by magnetic force.

[0070] In the above-described embodiment, the air filter 15 is disposed between the front portion 24 of the housing 11 and the magnetic shield 16 , but the present invention is not limited thereto.

[0071] For example, the air filter 15 may be arranged between the magnetic shield 16 and the electrical device 2 or outside the housing 11 .

[0072] For example, at least one of the air filter 15 and the magnetic material shield 16 may be omitted.

[0073] In the above embodiment, only the magnetic filters 14 and 14A are magnetized, but the present invention is not limited thereto. The magnetic shield 16 may be magnetized to function as the magnetic filter 14. In this case, the magnetic filter 14 may not be provided.

[0074] According to at least one embodiment described above, the dust-proof structure 10 (or the dust-proof structure 10A) has a magnetized magnetic material filter 14 (or the magnetic material filter 14A) arranged in the flow path of the air flowing through the air intake 25 of the shell 11, thereby preventing conductive foreign matter from intruding into the interior of the shell 11.

[0075] While some embodiments of the present invention have been described, these embodiments are provided as examples and are not intended to limit the scope of the invention. These embodiments may be implemented in various other ways and may be omitted, replaced, or modified without departing from the gist of the invention. These embodiments and their variations are intended to be within the scope and gist of the invention and are also intended to be within the scope of the invention as set forth in the claims and their equivalents.

[0076] Description of Reference Numerals

[0077] 1…cabinet, 2…electrical equipment, 10…dustproof structure, 11…housing, 12…cover component, 13…permanent magnet, 14…magnetic material filter (magnetic component, first magnetic component), 15…air filter (filter component), 16…magnetic material shield (second magnetic component), 25…air inlet, 32…ventilation port, 33…fixing component.

Claims

1. A dustproof structure, characterized in that: have: a housing housing the electrical device and having a first vent formed therein; a non-magnetic cover member covering the first vent and having a second vent different from the first vent; a magnetic member detachably fixed to a surface of the cover member so as to cover the second vent and having a hole formed therein for allowing gas flowing through the first vent to pass therethrough, the magnetic member being magnetized by being fixed to the cover member; as well as A magnet is fixed to the back surface of the cover member so as not to contact the housing, magnetizes the magnetic member, and fixes the magnetic member to the cover member by magnetic force.

2. The dustproof structure according to claim 1, characterized in that: The dustproof structure includes a fixing member that fixes the magnet to the cover member.

3. The dustproof structure according to claim 1 or 2, characterized in that: The dustproof structure includes a filter member disposed in a flow path of gas flowing through the first vent formed in the housing.

4. The dustproof structure according to claim 1 or 2, characterized in that: The dustproof structure includes a second magnetic member disposed inside the housing between a first magnetic member serving as the magnetic member and the electrical device.

5. The dustproof structure according to claim 3, characterized in that: The dustproof structure includes a second magnetic member disposed inside the housing between a first magnetic member serving as the magnetic member and the electrical device.

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