Electrical equipment storage box

Abstract

To suppress sound emitted from a gap between a housing of an electrical equipment storage box and a light shielding plate.SOLUTION: An electrical equipment storage box 1 includes a housing 10 that houses electrical equipment, and a light shielding plate 20 provided on the side and / or ceiling surface of the housing 10, and a porous surface portion 52 having a plurality of ventilating holes 51 is provided in a space between the housing 10 and the light shielding plate 20, and an air layer AL is formed between the porous surface portion 52 and the surface facing the porous surface portion 52.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a box for storing electrical equipment. [Background technology]

[0002] In electrical equipment storage boxes installed outdoors, the inside of the box may become hot due to radiant heat from direct sunlight and temperature rises caused by heat generated by the stored electrical equipment, which may adversely affect the electrical equipment. Therefore, as disclosed in Patent Document 1, it has been considered to provide slits and ventilation devices for dissipating heat generated by the electrical equipment inside the box, cooling devices for cooling the inside of the box, etc. on the side of the box, and to provide a light shielding plate on the side of the box to cover the slits and these devices and block direct sunlight from reaching the box. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-91606 A

[0004] However, with conventional technology, there was a risk that sounds generated by the ventilation system or cooling system, or sounds generated by electrical equipment inside the box, would become noise and leak out to the outside of the box. Summary of the Invention [Problem to be solved by the invention]

[0005] The inventor of the present invention has studied this point diligently and attempted to solve the problem. The problem to be solved by the present invention is to be able to suppress the sound emitted from the gap between the housing of the electrical equipment storage box and the light blocking plate. [Means for solving the problem]

[0006] In order to solve the above problems, the electrical equipment storage box is provided with a housing for storing electrical equipment and a light-shielding plate on the side and / or ceiling surface of the housing, the space between the housing and the light-shielding plate is provided with a porous surface portion having a plurality of holes that allow ventilation, and the electrical equipment storage box is provided with an air layer between the porous surface portion and the surface opposite the porous surface portion.

[0007] It is also preferable to provide a ventilation means or cooling means on the side or ceiling surface of the housing, and to provide a soundproofing member with a porous surface portion in the space between the side or ceiling surface and a light-shielding plate provided on the side or ceiling surface.

[0008] It is also preferable that the sound suppression member is disposed so as to face the front of the ventilation means or cooling means, and that the porous surface of the sound suppression member is disposed so as to face the ventilation means or cooling means.

[0009] It is also preferable that the sound suppression member is disposed above, below, or to the side of the ventilation means or cooling means when viewed from the front.

[0010] It is also preferable that the porous surface portion is provided with a plurality of types of holes with different sizes.

[0011] It is also preferable that a plurality of porous surface portions are provided in a stacked manner.

[0012] It is also preferable to provide a configuration in which a change means for changing the frequency band to be reduced is provided in either the light blocking plate or the sound suppression member having the porous surface portion. Effect of the Invention

[0013] The present invention can suppress noise emanating from the gap between the housing of the electrical equipment storage box and the light blocking plate. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view of an electrical device storage box according to the embodiment. [Diagram 2]2 is an exploded perspective view of the electrical device storage box of FIG. 1 with a light shielding plate and the like disassembled. FIG. [Diagram 3] 2 is an exploded perspective view of one side portion of the electrical device storage box of FIG. 1. FIG. [Figure 4] This is a diagram showing the internal structure so as to understand the relationship between the housing, the light shielding plate, and the sound suppression member when the components shown in Fig. 3 are combined, however, the light shielding plate is shown as being provided only on one side of the housing. [Diagram 5] 4 is an exploded perspective view showing a case where a noise countermeasure member having a different configuration from the example shown in FIG. 3 is used. FIG. [Figure 6] This is a diagram showing the internal structure so as to understand the relationship between the housing, the light-shielding plate, and the sound-proofing member when the components shown in Fig. 5 are combined, however, the light-shielding plate is shown as being provided only on one side of the housing. [Figure 7] FIG. 6 is an exploded perspective view showing a case where a noise countermeasure member having a different configuration from the examples shown in FIGS. 3 and 5 is used. [Figure 8] This is a diagram showing the internal structure so as to understand the relationship between the housing, the light-shielding plate, and the sound-proofing member when the components shown in Fig. 7 are combined, however, the light-shielding plate is shown as being provided only on one side of the housing. [Figure 9] FIG. 8 is an exploded perspective view showing a case where a noise countermeasure member having a different configuration from the examples shown in FIGS. [Figure 10] This is a diagram showing the internal structure so as to understand the relationship between the housing, the light-shielding plate, and the sound-proofing member when the components shown in Fig. 9 are combined, however, the light-shielding plate is shown as being provided only on one side of the housing. [Figure 11] 13 is a diagram showing an example in which a sound-proof member having a porous surface portion provided with a plurality of types of holes of different sizes is attached to a light-shielding plate. FIG. [Figure 12] 12 is a perspective view showing the lower half of the structure shown in FIG. 11 when cut approximately in half. [Figure 13] 13 is a diagram showing an example in which a sound-proof member having a single row of holes in a porous surface portion is attached to a light-shielding plate. FIG. [Figure 14]14 is a perspective view of a portion that remains on the lower side when the structure shown in FIG. 13 is cut at a portion above a hole. FIG. [Figure 15] 13A and 13B are diagrams showing an example in which two sound-proof members with different hole diameters are attached to a light-shielding plate. [Figure 16] 16 is a perspective view showing the lower half of the structure to which the components of the example shown in FIG. 15 are assembled, when the structure is cut so as to be divided into upper and lower halves. FIG. [Figure 17] FIG. 13 is a diagram showing an example in which a long hole is provided in a porous surface portion. [Figure 18] 13 is a diagram showing an example in which a cylindrical member is provided at a location where holes are present in a porous surface portion. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The following describes an embodiment of the invention. As can be understood from FIG. 1 to FIG. 4, the electrical device storage box 1 of this embodiment includes a housing 10 for storing electrical devices, and a light shielding plate 20 on the side and ceiling of the housing 10. The electrical device storage box 1 includes a porous surface portion 52 having a plurality of holes 51 that allow ventilation in the space between the housing 10 and the light shielding plate 20, and an air layer AL is provided between the "porous surface portion 52" and the "surface facing the porous surface portion 52 (here, the surface of the light shielding plate 20)". This makes it possible to suppress sound coming from the gap between the housing 10 and the light shielding plate 20 of the electrical device storage box 1. The light shielding plate 20 may be provided on at least one of the side and ceiling of the housing 10.

[0016] Here, the basic structure of the electrical device storage box 1 will be described. The electrical device storage box 1 of the embodiment includes a housing 10 that is placed on the ground. This housing 10 includes a housing main body 11 with an opening on the front side, and a door 12 that can close the opening provided in the housing main body 11. In the embodiment, the housing main body 11 includes left and right side surfaces, a ceiling surface, a bottom surface, and a back surface. In addition, a locking device 12a provided on the door 12 can prevent the door 12 from being opened relative to the housing main body 11.

[0017] In the embodiment, a light shielding plate 20 is attached to the housing 10 to prevent the inside of the housing 10 from becoming too hot due to sunlight or the like. The light shielding plate 20 is attached with a gap between it and the housing 10. In the example shown in Fig. 1, the light shielding plate 20 is attached to the left and right side surfaces and the ceiling surface, but the attachment locations of the light shielding plate 20 are not limited to these locations because the locations where light should be shielded depend on the installation mode of the electrical device storage box 1. For example, the light shielding plate 20 may be attached to the door 12.

[0018] 1 and the like, a stud 10a is provided on the housing 10, and a light shielding plate 20 is attached via the stud 10a. By attaching the light shielding plate 20 to the housing 10, even if the electrical device storage box 1 installed outdoors is exposed to sunlight, a rise in temperature inside the housing 10 can be suppressed, and therefore, the electrical device stored inside the housing 10 can be prevented from malfunctioning or breaking down.

[0019] The gap between the light shielding plate 20 and the housing 10 functions to suppress a rise in temperature inside the housing 10, but sound generated inside the housing 10 may leak to the outside through this gap. This sound may be recognized as noise in some cases. For this reason, in the embodiment, a porous surface portion 52 having a plurality of holes 51 that allow ventilation is provided in the space between the housing 10 and the light shielding plate 20. The porous surface portion 52 is disposed so as to provide an air layer AL between the porous surface portion 52 and the surface facing the porous surface portion 52, so as to suppress sound from escaping from the gap between the light shielding plate 20 and the housing 10 and becoming noise (see Figs. 2 to 4).

[0020] With this configuration, it is possible to reduce sounds in a specific frequency band. Sounds in a specific frequency band are reduced because the sounds that pass through the holes 51 in the porous surface portion 52 resonate within the structure that constitutes the air layer AL. In other words, the kinetic energy of the sounds is absorbed around the specific resonating frequency, and the sound of the specific frequency is reduced. Hereinafter, this specific frequency may be referred to as the resonant frequency.

[0021] The resonant frequency is affected by factors such as the diameter of the holes 51 in the porous surface portion 52, the cross-sectional area of ​​the holes 51 in the porous surface portion 52, the thickness of the porous surface portion 52 (the length of the holes 51 in the porous surface portion 52), and the volume of the air layer AL provided between the porous surface portion 52 and the opposing surface. Therefore, by changing the value of each factor, the resonant frequency can be changed, and the frequency band of sounds to be reduced can be changed.

[0022] The preferred location for providing the porous surface portion 52 is the space between the surface of the housing 10 on which the ventilation means is provided and the light blocking plate 20, but a certain degree of effect can be expected even in the space between the surface on which the ventilation means is not provided and the light blocking plate 20. Examples of the ventilation means include a ventilation fan or louvers 81 provided for the purpose of ventilating the air inside and outside the housing 10, as well as slits and ventilation holes.

[0023] In addition, cooling means may be provided on the side or ceiling surface to suppress a rise in temperature inside the housing 10. In this case, it is also preferable to provide a porous surface portion 52 in the space between the surface on which the cooling means is provided and the light blocking plate 20. Examples of the cooling means include a heat exchanger, electronic cooler, compressor cooler, etc., which are provided for the purpose of cooling the inside of the housing 10.

[0024] The reason why it is preferable to provide the porous surface portion 52 in the space between the surface on which the ventilation means or cooling means is provided and the light blocking plate 20 is that it is possible to suppress the device noise of the ventilation means or cooling means, the driving noise of the electric devices installed inside the housing 10, and the like from leaking out to the outside of the housing 10. In other words, this is because it is possible to reduce sounds in a specific frequency band while making it easier to suppress the temperature rise inside the housing 10.

[0025] In order to make this possible relatively easily, if the side or ceiling surface of the housing 10 is provided with ventilation or cooling means, it is preferable to provide a sound-proofing member 50 with a porous surface portion 52 in the space between the side or ceiling surface and the light-shielding plate 20 provided on the side or ceiling surface. EXAMPLES

[0026] Here, a more specific description will be given with reference to an example. In the example shown in Fig. 3 and Fig. 4, a soundproofing member 50 having a porous surface portion 52 is disposed in the space between the side surface of the housing 10 having a louver 81 as a ventilation means and the light-shielding plate 20. In this example, a closed space is formed by the flat soundproofing member 50 and the light-shielding plate 20. The louver 81 in the embodiment is attached to the housing 10 so as to cover the ventilation hole 13 provided in the housing 10.

[0027] In this example, a plate-shaped soundproofing member 50 is attached to a light-shielding plate 20 with bent top, bottom, left and right ends, forming a closed space inside the light-shielding plate 20, partitioned by the light-shielding plate 20 and the soundproofing member 50. This closed space forms an air layer AL and is used to reduce sound. Note that the closed space referred to here means a space that is approximately closed, but is not completely closed.

[0028] 3 has a plurality of holes 51 aligned on its surface, and sound generated from the housing 10 etc. can enter the closed space through the holes 51. The sound that enters the closed space is resonated, thereby reducing sounds in a specific frequency band.

[0029] As described above, the sound in the frequency band to be reduced can be set according to the diameter, cross-sectional area, and length of the holes 51 formed in the porous surface portion 52, and the volume of the closed space. Also, the sound in the frequency band to be reduced can be changed by changing the intervals between the multiple holes 51 formed in the porous surface portion 52. EXAMPLES

[0030] Next, the second embodiment will be described. In the example shown in Fig. 5 and Fig. 6, this embodiment is similar to the previous embodiment in that a sound-proofing member 50 that partitions a closed space by combining with a light-shielding plate 20 is provided on the side of a housing 10 equipped with a ventilation means (louver 81). However, it is different in that the size of the sound-proofing member 50 is reduced so that it is positioned only around the front side of the ventilation means, and the end of the sound-proofing member 50 has a folded shape.

[0031] Since the sound emitted from the housing 10 is often sound generated from the ventilation means or sound leaking out of the housing 10 via the ventilation means, the effect of reducing the sound can be effectively obtained by providing the porous surface portion 52 so as to face the front of the ventilation means. Also, by making the size of the sound countermeasure member 50 smaller than the size of the light blocking plate 20 as in this embodiment, it is possible to reduce the manufacturing cost of the sound countermeasure member 50 and to make the sound countermeasure member 50 lighter. EXAMPLES

[0032] The next embodiment is similar to the first and second embodiments in that it is an example in which a sound-proofing member 50 is provided on the side of the housing 10 equipped with a ventilation means (louver 81) by combining it with a light-shielding plate 20 to form a closed space, but the orientation of the porous surface portion 52 in the sound-proofing member 50 is significantly different. In this embodiment, a sound-proofing member 50 is used, which is formed by bending a plate-like member having holes 51. The sound-proofing member 50 has an open surface facing the light-shielding plate 20, and in the example shown in Figs. 7 and 8, it is disposed at a lateral position (in front of and behind the ventilation means) when the ventilation means is viewed from the front. These sound-proofing members 50 are disposed so that the porous surface portions 52 face each other. Although not essential, it is also preferable to install the porous surface portion 52 of the sound-proofing member 50 so that it faces the direction of the ventilation means.

[0033] In the first and second embodiments, the porous surface portion 52 is disposed so as to be substantially parallel to the surface on which the ventilation means is attached, and when the distance between the porous surface portion 52 and the surface of the light-shielding plate 20 facing it is to be increased, the distance between the light-shielding plate 20 and the housing 10 is increased. On the other hand, when the porous surface portion 52 is provided so as to be substantially perpendicular to the surface on which the ventilation means is attached as in this embodiment, even when the distance between the porous surface portion 52 and the surface of the sound-shielding member 50 facing it is increased, it is not necessary to increase the distance between the light-shielding plate 20 and the housing 10. Therefore, the size of the sound-shielding member 50 can be changed without increasing the size of the light-shielding plate 20 or the electrical device storage box 1. In other words, the specific frequency band that is the target for reducing sound can be easily changed.

[0034] Since this is possible, it is preferable to place the sound suppression member 50 above, below, or to the side of the ventilation means or cooling means when viewed from the front.

[0035] In the third embodiment, the sound countermeasure member 50 is installed at two locations, one in front of the ventilation means and one behind the ventilation means, but it may be installed at two locations above and below the ventilation means, or at four locations above, below, front, rear, or just one of the locations. The sound countermeasure member 50 is not limited to being formed in a rod shape, but may be formed in a substantially L-shape or a substantially U-shape to cover the periphery of the ventilation means. EXAMPLES

[0036] Example 4 is an example in which a sound countermeasure member 50 with a closed space inside is provided in the space between the side surface of the housing 10 with the ventilation means (louver 81) and the light blocking plate 20. It differs from Example 3 in that the closed space is defined only by the sound countermeasure member 50 and the penetration direction of the holes 51 of the porous surface portion 52. This is because the sound countermeasure member 50 is disposed above and below the ventilation means in the penetration direction of the holes 51 (see Figs. 9 and 10), and the sound countermeasure member 50 is a box-shaped member with walls in all directions, front to back, up to down, left to right, and so on.

[0037] In the case of this embodiment, since the ventilation means is provided below the side of the housing 10, the sound control member 50 provided above the ventilation means can be made considerably larger in size in the upward direction, allowing for flexible setting of the frequency range of sounds to be reduced. EXAMPLES

[0038] There are various possible examples of the sound countermeasure member 50. For example, in the example shown in Fig. 11 and Fig. 12, a plurality of holes 51 with different diameters are aligned on a porous surface portion 52 of the sound countermeasure member 50. In this case, a partition may be provided between the sound countermeasure member 50 and the light blocking plate 20 for each hole 51 with a different diameter. By doing so, it becomes possible to reduce sounds in specific frequency bands corresponding to each of the different holes 51.

[0039] In the first to fourth embodiments, it is possible to reduce sounds in a specific frequency band, but there is a possibility that no effect can be obtained in other frequency bands. On the other hand, by arranging holes 51 with different diameters as in the present embodiment, it is expected that sounds in both a certain frequency band and another frequency band can be reduced. As can be seen from this example, it is preferable to provide a configuration in which multiple types of holes 51 with different sizes are provided in the porous surface portion 52.

[0040] In this embodiment, an example in which two types of holes 51 with different diameters are aligned is shown, but three or more types may be arranged. Also, in this embodiment, the different holes 51 are arranged in the center and at both the left and right ends, but they may be arranged in the upper and lower parts, or the different holes 51 may be arranged alternately. Note that, although embodiment 5 shown in Figs. 11 and 12 is a modified example of embodiment 1, it can also be applied like the modified examples of embodiments 2 to 4. EXAMPLES

[0041] In this embodiment, a plurality of partitions are provided between the sound countermeasure member 50 and the light shielding plate 20, and holes 51 are provided in the sound countermeasure member 50 so that one hole 51 corresponds to each partitioned closed space (see Figs. 13 and 14). In this case, two resonance tubes are generated in the partitioned closed space, one from the hole 51 provided in the porous surface portion 52 to the upper end, and the other from the hole 51 to the lower end. Since the resonating frequency differs depending on the size of the resonance tube (the distance from the hole 51 to the end), the two resonance tubes can reduce sounds in a plurality of frequency bands.

[0042] In this embodiment, since the holes 51 are provided at the same height for each partitioned closed space, the resonating frequency of the resonance tubes of each closed space is the same. Therefore, it is expected that the sound of a specific frequency band will be greatly reduced. The height of the holes 51 corresponding to each partitioned closed space does not have to be in this manner. If the heights of the holes 51 are different, it is expected that the sound of a plurality of frequency bands will be reduced. Note that although the embodiment 6 shown in Figs. 13 and 14 is a modified example of the embodiment 1, it can also be applied like the modified examples of the embodiments 2 to 4. EXAMPLES

[0043] In this embodiment, a sound countermeasure member 50 (second porous surface portion 522) is further disposed in the closed space formed by the light blocking plate 20 and the sound countermeasure member 50 (first porous surface portion 521). In the example shown in Fig. 15 and Fig. 16, the holes 51 provided in the first porous surface portion 521 have the same center-to-center interval as the holes 51, but a second porous surface portion 522 having smaller holes 51 is disposed in the closed space.

[0044] With such a structure, it is expected to reduce both the sound of the frequency band reduced by the first porous surface portion 521 and the sound of the frequency band reduced by the second porous surface portion 522, to reduce the sound within a range that spans the frequency band reduced by the first porous surface portion 521 and the frequency band reduced by the second porous surface portion 522, or to more greatly reduce the sound of the frequency band reduced by the first porous surface portion 521. As can be seen from these examples, it is also preferable to have a configuration in which multiple porous surface portions 52 are provided in a stacked manner.

[0045] Of course, it is not necessary to adopt the configuration shown in Figure 15, and the size of the holes 51 in the first porous surface portion 521 may be smaller than the size of the holes 51 in the second porous surface portion 522, or the sizes of the holes 51 in the first porous surface portion 521 and the second porous surface portion 522 may be the same.

[0046] The intervals between the holes 51 of the first porous surface portion 521 and the second porous surface portion 522 may be different. Furthermore, the first porous surface portion 521 may be formed as in Example 1, while the second porous surface portion 522 may be applied to the examples of Examples 2 to 4. Furthermore, the form shown in FIG. 15 may be applied to the examples of Examples 2 to 4.

[0047] Although not shown, the sound countermeasure member 50 reduces sounds in a specific frequency band, so a sound countermeasure member 50 may be provided for each frequency band. However, this increases the cost accordingly, so it is preferable to provide the light blocking plate 20 or the sound countermeasure member 50 with a change means for changing the frequency band to be reduced.

[0048] Specifically, the means for changing the mounting position of the sound countermeasure member 50 relative to the light blocking plate 20 can be exemplified by providing a mechanism that allows the sound countermeasure member 50 to slide inside the light blocking plate 20, or by providing a plurality of mechanisms for mounting the sound countermeasure member 50 to the light blocking plate 20. Further, the means can be exemplified by providing a mechanism for blocking the holes 51 in order to reduce the number of holes 51 provided in the porous surface portion 52 of the sound countermeasure member 50, or a mechanism for changing the size or length of the holes 51.

[0049] Furthermore, the shape of the holes 51 is not limited to a circle, but may be any shape, such as an ellipse as shown in FIG. 17, or a polygonal shape such as a triangle or a rectangle.

[0050] Furthermore, a tubular member 53 may be attached to the hole 51. By doing so, the length of the hole 51 can be increased without increasing the thickness of the porous surface portion 52, and the specific frequency band that is the target for sound reduction can be easily changed. In this case, the length of the hole 51 can be further increased by providing the tubular member 53 so as to protrude not only from one surface of the porous surface portion 52 but also from the other surface. Also, by changing the length of the tubular member 53 for each hole 51, it is expected that sounds in multiple frequency bands can be reduced.

[0051] Although the present invention has been described above by taking the embodiment as an example, the present invention is not limited to the above embodiment and can be in various forms. For example, the sound-proof member may have a surface with a plurality of holes and may be in a plate shape or a bent shape, and the light-shielding plate may have any shape as long as it is a plate material that is effective in blocking direct sunlight from the housing.

[0052] Furthermore, the method of attaching the soundproofing member to the light blocking plate and the method of attaching the light blocking plate provided with the soundproofing member to the housing are not limited to the method using studs, and any method may be used. [Explanation of symbols]

[0053] 1 Electrical equipment storage box 10. Chassis 20 Shading plate 50 Noise reduction materials 51 holes 52 Porous surface part AL Air Layer

Claims

1. An electrical equipment storage box including a housing for storing electrical equipment and a light shielding plate on a side surface and / or a ceiling surface of the housing, a porous surface portion having a plurality of holes for allowing ventilation is provided in a space between the housing and the light blocking plate, the porous surface portion being spaced apart from the housing; An air layer is provided between the porous surface portion and a surface facing the porous surface portion, This electrical device storage box is capable of resonating sound that has leaked out of the housing, passed through holes in a porous surface portion spaced from the housing, and entered an air layer.

2. A ventilation means or a cooling means is provided on the side or the ceiling of the housing, 2. The electrical equipment storage box according to claim 1, wherein a soundproofing member having a porous surface portion is provided in the space between the side or ceiling surface and a light-shielding plate provided on the side or ceiling surface.

3. 3. An electrical equipment storage box as claimed in claim 2, characterized in that the soundproofing member is arranged so as to face the front of the ventilation means or cooling means, and the porous surface portion of the soundproofing member is installed so as to face the ventilation means or cooling means.

4. 3. The electrical equipment storage box according to claim 2, wherein the sound suppression member is disposed above, below or to the side of the ventilation means or the cooling means when viewed from the front.

5. 5. The electrical equipment storage box according to claim 1, wherein the porous surface portion is provided with a plurality of types of holes having different sizes.

6. 5. The electrical equipment storage box according to claim 1, wherein a plurality of porous surface portions are provided one on top of the other.

7. 5. The electrical equipment storage box according to claim 1, further comprising a change means for changing the frequency band to be reduced in either the light blocking plate or the sound suppression member having the porous surface portion.

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