Housing for accommodating electrical equipment

Abstract

To provide a housing for accommodating electrical equipment having a structure in which exhaust by natural ventilation is performed smoothly.SOLUTION: A housing for accommodating electrical equipment comprises: an opening 41 provided in a top plate 4 for releasing air heated by heat generation of an accommodated transformer 8; and a frame body 11 having a fixed height and arranged along an edge portion around the opening 41. The edge portion of the opening is raised, and a covering body 7 for covering the opening 41 is arranged on the top plate 4. The covering body 7 includes: a flat shield plate 13 that covers an area above the opening 41; a skirt portion 7a that covers a periphery of the opening 41 and the shield plate 13; and a top frame portion 7b that is disposed so as to cover an area above the shield plate 13 from an upper part of the skirt portion 7a and forms a top surface. An exhaust port 71 for releasing upwardly the air, which has risen from the opening 41, is formed in a center of the top surface surrounded by the top frame portion 7b. The shield plate 13 is a flat plate body arranged substantially horizontally, and a vent hole 13b for allowing the air to pass upwardly is formed around the periphery of the shield plate 13.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a housing for storing electrical equipment that is installed outdoors and uses natural ventilation to cool electrical equipment stored therein. [Background technology]

[0002] Enclosures that house heat-generating electrical equipment such as transformers are equipped with ventilation functions to prevent the internal temperature from rising due to the heat generated. For such enclosures installed outdoors, it is desirable to install a fan or other device to force the air out, but this requires regular inspections and is troublesome to maintain, such as replacing components, so natural ventilation is often used. When using natural ventilation, an air intake is installed at the bottom and an exhaust at the top to use natural convection to dissipate heat. In this case, the exhaust at the top must be designed to prevent rainwater and dust from entering and to prevent fallen leaves and other debris from blocking the exhaust. For example, in Patent Document 1, an opening for exhaust is provided on the top surface of the housing, an upper plate formed wider than the opening is placed above the opening, and a first folded portion formed in a frame shape is provided around the opening to prevent rainwater and dust from entering through the exhaust port. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-38227 Summary of the Invention [Problem to be solved by the invention]

[0004] The exhaust structure of Patent Document 1 prevents the intrusion of rainwater and dust by using a first bent portion that rises around the opening and a second bent portion that is bent downward around the upper plate. However, the second bend creates a section where the exhaust air flows downward, creating the problem of a wall being formed in the air flow path, preventing smooth exhaust and making it prone to heat buildup.

[0005] SUMMARY OF THE INVENTION In view of the above problems, the present invention has an object to provide a housing for storing electrical equipment that has a structure that allows for smooth exhaust by natural ventilation. [Means for solving the problem]

[0006] In order to solve the above problems, the first configuration of the present invention is a housing for storing electrical equipment having an opening in the top plate to release air heated by the heat generated by the stored electrical equipment, a frame body of a certain height is arranged along the edge around the opening, raising the edge of the opening, while a covering body is arranged on the top plate to cover the opening, and the covering body has a shielding plate that covers the top of the opening, a skirt portion that covers the opening and the periphery of the shielding plate, and a top frame portion that is arranged from the top of the skirt portion to cover the top of the shielding plate and forms the top surface, an exhaust port is formed in the center of the top surface surrounded by the top frame portion to release the heated air that rises from the opening upward, and the shielding plate is a flat plate body arranged approximately horizontally, and ventilation holes are arranged around the skirt portion on the outside of the opening of the shielding plate to allow air to pass upward. With this configuration, the air flow path from the opening to the exhaust port only has a flat, approximately horizontal shielding plate. The air flow path is composed of spaces for lateral and upward movement, and there is no place along the way that forces the air to move downward. This means there is no obstruction to block the flow and no heat buildup occurs. Therefore, air heated by electrical equipment can be smoothly released to the outside through the exhaust port. Furthermore, even if rainwater gets into the exhaust port, the shielding plate prevents it from entering the opening, so it does not enter the housing.

[0007] Another aspect of the present invention is characterized in that, in the above configuration, the electrical equipment is a transformer, and the opening has dimensions equal to or larger than the width and depth of the transformer and is formed directly above the transformer. With this configuration, the size of the opening is equal to or larger than the size of the stored transformer, and it is located directly above the transformer, so the air heated by the transformer and rising is smoothly released to the outside through the opening, which prevents the formation of heat pools and effectively prevents the temperature inside the box from rising. [Effects of the Invention]

[0008] According to this invention, the air flow path from the opening to the exhaust port is only a flat shielding plate, and the air flows both horizontally and upward, with no obstruction to force the air downward. This prevents heat buildup and prevents the air from blocking the flow. Therefore, air heated by electrical equipment can be smoothly released to the outside through the exhaust port. Even if rainwater gets into the exhaust port, the shielding plate prevents it from entering the opening, preventing it from entering the housing. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing an example of a housing for storing electrical equipment according to the present invention; [Figure 2] FIG. 2 is an explanatory side view of the electrical device housing; [Figure 3] 1A and 1B are perspective views of the top plate, in which (a) shows the state in which the opening is exposed, and (b) shows the state in which the middle plate is placed over the opening. [Figure 4] The top plate and covering body are shown, (a) is a plan view, and (b) is a side view. [Figure 5] FIG. 5 is an end view taken along line AA in FIG. 4. [Figure 6] FIG. 10 is a perspective view of the top plate with a shielding plate disposed over the opening. [Figure 7] FIG. 6 is an enlarged cross-sectional explanatory view of part B in FIG. 5. [Figure 8] FIG. 2 is an explanatory plan view of the electrical equipment housing housing with the cover removed, showing the relationship between the internal electrical equipment and the opening. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figures 1 and 2 show an example of a housing for storing electrical equipment according to the present invention, with Figure 1 being a perspective view and Figure 2 being a right side view. In Figure 2, the housed electrical equipment is indicated by dashed lines. The electrical equipment housing (hereinafter simply referred to as "housing") 1 is a rectangular metal box having left and right side panels 2, a back panel 3, a top panel 4, and a bottom panel 5, with a door 6 on the open front, which is formed to close off the internal electrical equipment housing section. A cover 7 is disposed on the top panel 4 to exhaust heated air from inside. 8 denotes a transformer, and the configuration shows a transformer 8 housed as electrical equipment. The housing 1 is shown placed on a base 9.

[0011] The structures of the top plate 4 and the covering body 7 will be described below with reference to FIGS. Figure 3 is a perspective view of the top plate 4, with (a) showing the state where the opening is exposed and (b) showing the state where the middle plate is placed over the opening. Figure 4 shows the top plate with the covering attached, with (a) being a plan view and (b) being a side view. Figure 5 is an end view taken along line AA in Figure 4. Note that the plan view and other drawings are based on the top surface 4a of the top plate 4, but the top surface 4a of the top plate 4 has a gentle downward slope toward the rear as shown in Figure 2.

[0012] As shown in Fig. 3, the top plate 4 has an opening 41 for discharging the internal air heated by the transformer 8. A frame 11 having a certain width (height) is arranged along the edge of the end of the opening 41. As a result, the frame 11 reinforces the opening 41 and also raises the opening 41 by a certain height relative to the top plate 4. This raised height prevents rainwater falling on the top plate 4 from entering the opening 41.

[0013] The top plate 4 is formed with a gentle downward slope (a slope of 1 / 30 or more) toward the rear, so that rainwater does not accumulate but flows out to the rear. A mesh-like middle plate 12 is placed in the opening 41 to prevent foreign matter from entering.

[0014] As shown in Fig. 4, the covering body 7 has a skirt portion 7a that covers the periphery of the opening 41 and a top frame portion 7b that is positioned above the opening 41, and is formed to cover the opening 41. The top frame portion 7b has a large opening in the center, where an exhaust port 71 is formed, and inside the covering body 7, as shown in Fig. 5, a shielding plate 13 is arranged to prevent rainwater that has entered through the exhaust port 71 from entering the opening 41. In addition, gaps 72 are provided on each side of the lower part of the skirt portion 7a to drain rainwater that has fallen into the exhaust port 71. The bottom plate 5 is provided with an opening (not shown) for introducing outside air so that air can be smoothly exhausted from the exhaust port 71.

[0015] FIG. 6 is a perspective explanatory view of the shielding plate 13, with the skirt portion 7a and top frame portion 7b of the covering body 7 omitted to show the positional relationship with the opening 41 (frame body 11) of the top plate 4. 6, the shielding plate 13 is a flat plate disposed approximately horizontally and is arranged parallel to the opening 41. Connecting pieces 13a for connecting to the skirt portion 7a are provided at appropriate locations around the periphery, and notches (ventilation holes) 13b are formed between adjacent connecting pieces 13a to send the air coming out of the opening 41 to the exhaust port 71. The ventilation hole 13b is formed at the end of the shielding plate 13 near the skirt portion 7a so as not to overlap directly above the opening 41, and is formed so as to reliably close the upper part of the opening 41.

[0016] 5 indicates the central axis passing through the center of opening 41, and is shown as a straight line perpendicular to top surface 4a. This central axis M is also the center of shielding plate 13 and the center of exhaust port 71. In other words, opening 41, shielding plate 13, and exhaust port 71 are arranged so that their centers coincide. Also, ventilation hole 13b formed in shielding plate 13 does not have to be formed by cutting out an end, and ventilation hole 13b can be formed by drilling a hole in shielding plate 13.

[0017] 7 is an enlarged view of part B in FIG. 5, showing the flow of air being released to the outside of the housing 1 from the opening 41. The air heated by the heat of the transformer 8 rises and exits upward from the opening 41. The air that exits from the opening 41 moves laterally as indicated by arrow Q1, and then passes through the ventilation hole 13b formed at the end of the shielding plate 13 and continues to rise as indicated by arrow Q2. In this way, the air that has reached above the shielding plate 13 moves upward through the exhaust port 71 as shown by arrow Q3 and is released to the outside.

[0018] Here, we will explain the positional relationship between the opening 41, the ventilation hole 13b, and the exhaust port 71. The ventilation hole 13b is formed so as to be positioned at a certain angle outward from the end of the frame body 11. Specifically, the ventilation hole 13b is formed so as to be positioned at an angle θ1 of 45 degrees or more from the substantially vertical direction (the direction of the central axis M shown in FIG. 5) at the end of the frame body 11 shown in FIG. 7. The positional relationship between ventilation hole 13b and exhaust port 71 is also the same, with ventilation hole 13b being formed so as to be disposed outward at a certain angle from the end of exhaust port 71. Specifically, ventilation hole 13b is formed at a position where angle θ2 from a substantially vertically downward direction (the direction of central axis M shown in FIG. 5) to the end of exhaust port 71 shown in FIG. 7 is 45 degrees or more. By forming the ventilation hole 13b at this angle, rainwater or dust that has entered the exhaust port 71 is reliably prevented from entering the inside of the housing 1 through the opening 41. The distance R1 between the frame 11 and the shielding plate 13, the width R2 of the ventilation hole 13b, and the distance R3 between the shielding plate 13 and the top frame portion 7b are set to distances (for example, 50 mm) that do not obstruct the flow of air.

[0019] Figure 8 is an explanatory plan view of housing 1 with covering body 7 removed, showing the relationship between the housed transformer 8 and opening 41. As shown in Figure 8, opening 41 is formed directly above transformer 8 and is larger than the outer shape of transformer 8. Specifically, depth T1 of opening 41 is larger than depth T2 of transformer 8, and width T3 of opening 42 is larger than width T4 of transformer 8.

[0020] As described above, the air flow path from opening 41 to exhaust port 71 has only flat shielding plate 13 in a substantially horizontal direction, and the air flow path is made up of spaces in which the air moves sideways and upward, with no place along the way that forces the air to move downward. Therefore, there is no obstruction to block the flow and no heat buildup occurs. Therefore, air heated by transformer 8 can be smoothly discharged to the outside through exhaust port 71. Furthermore, even if rainwater gets into exhaust port 71, shielding plate 13 prevents the rainwater from entering opening 41, so the rainwater does not get into housing 1. Furthermore, because the size of opening 41 is equal to or larger than the size of the housed transformer 8, the air heated by transformer 8 and rising is smoothly discharged to the outside through opening 41. This prevents the formation of heat pools and effectively prevents the temperature inside housing 1 from rising.

[0021] In the above embodiment, the electrical device is the transformer 8, but it does not have to be the transformer 8. For example, it is suitable as a housing for accommodating electrical devices such as devices equipped with a heat-generating rectifier circuit. Furthermore, the opening 42 need only be formed approximately above the transformer 8, not directly above it, and its size does not necessarily have to be larger than the outer shape of the transformer 8; even if it is about the same size as or slightly smaller, it will still be effective in dissipating heat. [Explanation of symbols]

[0022] 1·· Enclosure for storing electrical equipment, 4·· Top plate, 7·· Covering body, 7a·· Skirt portion, 7b·· Top frame portion, 8·· Transformer (electrical equipment), 11·· Frame body, 12·· Middle plate, 13·· Shielding plate, 13b·· Ventilation hole, 41·· Opening, 71·· Exhaust port

Claims

1. An electrical equipment housing having an opening on the top panel for releasing air heated by heat generated by the housed electrical equipment, A frame having a certain height is arranged around the opening along the edge, and the edge of the opening is raised; a cover for covering the opening is disposed on the top plate; the covering body includes a shielding plate that covers the upper part of the opening, a skirt portion that covers the periphery of the opening and the shielding plate, and a top frame portion that is disposed from the upper part of the skirt portion to cover the upper part of the shielding plate and forms a top surface; An exhaust port is formed in the center of the top surface surrounded by the top frame portion to release the heated air that has risen from the opening portion upward, and The shielding plate is a flat plate arranged approximately horizontally, and ventilation holes are provided around the skirt portion, which is on the outside of the opening of the shielding plate, to allow air to pass upward.This is a housing for storing electrical equipment.

2. 2. The electrical equipment storage enclosure according to claim 1, wherein the electrical equipment is a transformer, the opening has dimensions equal to or larger than the width and depth of the transformer, and is formed directly above the transformer.

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