Switch gear

Abstract

To provide a switch gear which enables improvement of workability during replacement of an air filter.SOLUTION: A switch gear includes a housing part, a roof part, an opening / closing plate part, and a filter. An electric device is disposed in the housing part. The roof part has an eaves part and an opening. The eaves part is provided at an upper part of the housing part and extends from a side surface of the housing part to the outer side of the housing part. The opening is provided on a side surface of the eaves part. The opening / closing plate part closes the opening in an openable / closable manner. The filter is disposed so as to match with a ventilation hole provided on a lower surface of the eaves part and provided so as to be insertable into or removable from the opening.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a switchgear. [Background technology]

[0002] Conventionally, switchgear (distribution boards) have been known in which electrical equipment is housed in a metal enclosure and has insulating properties to ensure safe long-term use. Outdoor switchgear is provided with an air filter at the air intake that has salt-resistant, dust-proof, insect-proof, and other functions according to the installation environment. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-183846 A Summary of the Invention [Problem to be solved by the invention]

[0004] When replacing the air filter, it is necessary to remove the roof ventilation opening and drip-proof plate that support the air filter from below the eaves, which necessitates the improvement of workability when replacing the air filter.

[0005] An object of the present invention is to provide a switchgear capable of improving the workability when replacing an air filter. [Means for solving the problem]

[0006] In order to achieve the above object, the switchgear of the present invention comprises a housing portion, a roof portion, an opening / closing plate portion, and a filter. Electrical equipment is arranged in the housing portion. The roof portion has an eaves portion and an opening. The eaves portion is provided on an upper portion of the housing portion and extends from a side surface of the housing portion toward the outside of the housing portion. The opening is provided on the side surface of the eaves portion. The opening / closing plate portion closes the opening in an openable and closable manner. The filter is disposed in accordance with a ventilation hole provided on the underside of the eaves portion, and is provided so as to be insertable and detachable from the opening. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram showing a part of the configuration of a switchgear according to the first embodiment. [Diagram 2] FIG. 2 is an enlarged schematic view of a portion A in FIG. 1 of the canopy portion of the switchgear of the first embodiment. [Diagram 3] FIG. 3 is a perspective view showing a part of a canopy portion of the switchgear of the first embodiment. [Figure 4] FIG. 4 is a bottom view showing a part of the canopy portion of the switchgear of the first embodiment. [Diagram 5] FIG. 5 is a front view showing a part of the canopy portion of the switchgear of the first embodiment. [Figure 6] FIG. 6 is a perspective view showing an opening / closing plate portion of the switchgear of the first embodiment. [Figure 7] FIG. 7 is a top view showing the opening / closing plate portion of the switchgear of the first embodiment. [Figure 8] FIG. 8 is a schematic diagram illustrating a filter removal process of the switchgear according to the first embodiment. [Figure 9] FIG. 9 is a schematic diagram illustrating a process of inserting a filter into the switchgear according to the first embodiment. [Figure 10] FIG. 10 is a schematic enlarged view showing a part of the canopy portion of the switchgear according to the second embodiment. [Figure 11] FIG. 11 is a front view showing a part of the canopy portion of the switchgear according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (First embodiment) The switchgear 1 of the first embodiment will be described in detail below with reference to the accompanying drawings. The configuration of the embodiment described below and the actions and results (effects) brought about by the configuration are merely examples and are not limited to the following description. Note that in this specification, ordinal numbers are used only to distinguish parts and members and do not indicate order or priority.

[0009] The structure of a switchgear 1 according to a first embodiment of the present invention will be described with reference to Figs. 1 to 7. Fig. 1 is a schematic diagram showing a part of the configuration of the switchgear 1 of the first embodiment. The switchgear 1 is, for example, outdoors, in a housing 10 that is closed with metal and grounded, and contains electrical devices. The switchgear 1 has insulation performance against the outside. Note that the structure of the switchgear 1 of the first embodiment is not limited to the example shown in Fig. 1.

[0010] In the following description, an X-axis, Y-axis, and Z-axis Cartesian coordinate system is defined. The +X direction is the front direction where the door 12 of the housing unit 10 is disposed, and the -X direction is the rear direction opposite to the front direction. The Y-axis direction is the left-right direction when viewed from the front direction, the +Y direction is the right direction, and the -Y direction is the left direction. The Z-axis direction is the height direction of the switchgear 1, the +Z direction is the upward direction, and the -Z direction is the downward direction. Note that the X-axis, Y-axis, and Z-axis Cartesian coordinate system is a coordinate system used for convenience, and the present invention can also be applied to switchgears to which this coordinate system cannot be applied.

[0011] As shown in FIG. 1, the switchgear 1 includes a housing 10, a roof 11, and a door 12. The roof 11 has an eave portion 13. The housing 10 is made of metal, for example, and configured in a rectangular box shape. The housing 10 houses a circuit breaker, a disconnecting switch, and the like. Note that FIG. 1 illustrates a portion of the housing 10 cut away to explain the inside of the housing 10. The door 12 is disposed on the front side of the housing 10.

[0012] Fig. 2 is a schematic diagram showing an enlarged view of part A in Fig. 1 of the overhanging portion 13 of the switchgear 1 of the first embodiment. Fig. 3 is a perspective view showing a part of the overhanging portion 13 of the switchgear 1 of the first embodiment. Fig. 4 is a bottom view showing a part of the overhanging portion 13 of the switchgear 1 of the first embodiment.

[0013] As shown in Figures 2 and 3, the eaves portion 13 is disposed on the upper portion 10a of the housing portion 10. The eaves portion 13 extends from the side surface 10b of the housing portion 10 toward the outside of the housing portion 10 (+X direction). The eaves portion 13 covers the housing portion 10 from above (+Z direction). The eaves portion 13 protects the housing portion 10 from bad weather such as wind and rain. The eaves portion 13 has an opening 131, two mounting holes 132, an opening / closing plate portion 14, a roof ventilation opening portion 15, a filter 16, a filter guide 17, and a drip-proof plate 18.

[0014] As shown in Figures 2 to 4, opening 131 is a hole provided on the front surface of eaves portion 13. Opening 131 extends in the Y-axis direction and the Z-axis direction. Opening 131 communicates between the inside and outside of eaves portion 13. Opening 131 is provided in a substantially rectangular shape. Two mounting holes 132 are holes provided on the front surface of eaves portion 13. Two mounting holes 132 communicate between the inside and outside of eaves portion 13.

[0015] The opening / closing plate 14 is fixed to the front surface of the eaves portion 13. The opening / closing plate 14 is a plate formed in a substantially rectangular shape. The opening / closing plate 14 extends in the Y-axis direction and the Z-axis direction. The opening / closing plate 14 covers the opening 131 from the front surface (+X direction) of the eaves portion 13. The size of the opening / closing plate 14 is larger than the size of the opening 131.

[0016] The roof ventilation opening portion 15 is a plate formed in a substantially rectangular shape. The roof ventilation opening portion 15 extends in the X-axis direction and the Y-axis direction. The end portion of the roof ventilation opening portion 15 in the +X direction is bent toward the -Z direction into a substantially L-shape. The roof ventilation opening portion 15 is fixed to the eaves portion 13 at the end portion bent into a substantially L-shape. The roof ventilation opening portion 15 is slightly inclined with respect to the housing portion 10 in a downward direction toward the opening portion 131.

[0017] The roof ventilation opening section 15 has an upper surface 151, a lower surface 152, and multiple ventilation openings 153. The upper surface 151 faces approximately in the +Z direction. The lower surface 152 faces approximately in the -Z direction. The upper surface 151 faces approximately in the +X direction at an end portion bent into an approximately L shape. The lower surface 152 faces approximately in the -X direction at an end portion bent into an approximately L shape.

[0018] The multiple ventilation openings 153 are holes for dissipating heat in order to suppress an increase in temperature inside the panel due to heat generated inside the housing unit 10 of the switchgear 1. Each of the multiple ventilation openings 153 is formed in a slit shape extending in the Y-axis direction. The multiple ventilation openings 153 are provided in the roof ventilation opening unit 15. The multiple ventilation openings 153 penetrate the upper surface 151 and the lower surface 152. The number of ventilation openings 153 provided is, for example, six. The position, shape and number of the multiple ventilation openings 153 are not limited to this.

[0019] The multiple ventilation openings 153 communicate between the inside and outside of the eaves portion 13. That is, gas can move between the inside and outside of the eaves portion 13 via the multiple ventilation openings 153, and heat generated in the housing portion 10 is released to the outside of the eaves portion 13 via the ventilation openings 153.

[0020] The filter 16 is a member that prevents dust, insects, and the like from entering the inside of the housing 10. The filter 16 is formed in a substantially rectangular parallelepiped shape. The filter 16 extends in the X-axis direction and the Y-axis direction. The filter 16 is provided in contact with the upper surface 151.

[0021] The filter guide 17 straightens the airflow flowing from the ventilation opening 153 into the inside of the eaves portion 13, and fixes the filter 16 in the height direction (Z-axis direction). The filter guide 17 forms a substantially rectangular parallelepiped shape. The filter guide 17 extends in the X-axis direction and the Y-axis direction. The length of the filter guide 17 in the X-axis direction is substantially the same as the length of the filter 16 in the X-axis direction, but is not limited to this. The filter guide 17 abuts against the upper surface of the filter 16. The filter guide 17 is an example of a guide portion.

[0022] The drip-proof plate 18 is a plate that prevents wind, rain, and the like from entering the filter 16 and the filter guide 17. The drip-proof plate 18 has a first portion 18a, a second portion 18b, and a third portion 18c. The first portion 18a extends in the Z-axis direction. The second portion 18b extends in the +X direction from an upper end of the first portion 18a. The third portion 18c extends in the -X direction from a lower end of the first portion 18a. In other words, the drip-proof plate 18 is formed in a swastika shape on the XZ plane.

[0023] The first portion 18a of the drip-proof plate 18 is disposed in the rear direction (-X direction) of the filter guide 17. The second portion 18b of the drip-proof plate 18 is disposed above the filter guide 17 (+Z direction). The drip-proof plate 18 covers the filter 16 and the filter guide 17 from above (+Z direction) and from the rear direction (-X direction). The third portion 18c of the drip-proof plate 18 is fixed to the upper surface 151 of the roof ventilation opening portion 15. The first portion 18a of the drip-proof plate 18 abuts against the end face of the filter 16 in the -X axis direction. The drip-proof plate 18 is an example of a partition plate.

[0024] Fig. 5 is a front view showing a part of the eaves portion 13 of the switchgear 1 of the first embodiment. As shown in Fig. 5, an opening 131 is provided in a side surface 19 of the eaves portion 13. The side surface 19 is an end surface of the eaves portion 13 in the +X direction and is the front surface of the eaves portion 13. Two mounting holes 132 are provided in the side surface 19. The opening 131 is provided between the two mounting holes 132 in the Y-axis direction.

[0025] Fig. 6 is a perspective view showing the opening / closing plate portion 14 of the switchgear 1 of the first embodiment. Fig. 7 is a top view showing the opening / closing plate portion 14 of the switchgear 1 of the first embodiment. As shown in Figs. 6 and 7, the opening / closing plate portion 14 has an opening / closing plate 141, a handle 142, and a pressing plate 144. The opening / closing plate 141 is formed in a substantially rectangular flat plate shape. The opening / closing plate 141 is made of a metal such as aluminum. The pressing plate 144 is an example of a fixing member.

[0026] The eaves portion 13 further has two nuts 13a. The two nuts 13a are members that fix the eaves portion 13 and the opening / closing plate portion 14 to each other. The two nuts 13a are fixed to the back surface of the side surface 19 by, for example, welding. The two nuts 13a are provided on an end of the opening / closing plate 141 in the +Y direction and an end of the opening / closing plate 141 in the -Y direction, respectively.

[0027] The opening / closing plate 141 has two bolts 13b, two bolts 141a, and a gasket 1413. The two bolts 13b are members that fix the eaves portion 13 and the opening / closing plate portion 14 to each other on the side surface 19 of the eaves portion 13. The two bolts 13b are inserted into the two mounting holes 132, respectively. The two bolts 13b are fixed to the front surface of the opening / closing plate 141, for example, by welding. The two bolts 13b are provided at an end of the opening / closing plate 141 in the +Y direction and an end of the opening / closing plate 141 in the -Y direction, respectively. The bolts 13b are fastened by nuts 13a to fix the eaves portion 13 and the opening / closing plate portion 14 to each other. Note that the positions at which the two mounting holes 132 and the two bolts 13b are provided are not limited to those described above.

[0028] The two bolts 141a are members that secure the opening / closing plate 141 and the pressing plate 144 to each other. The two bolts 141a are fixed to the front surface of the opening / closing plate 141 by, for example, welding. The two bolts 141a are provided between one bolt 13b and the handle 142 and between the other bolt 13b and the handle 142 in the Y-axis direction, respectively.

[0029] The gasket 1413 is fixed to the periphery of the rear surface of the opening / closing plate 141. The gasket 1413 is pressed against the side surface 19 to bring the opening / closing plate 141 and the eaves portion 13 into close contact with each other, thereby providing a waterproof effect. The gasket 1413 is an example of a sealing member.

[0030] The handle 142 is a member that an operator grasps when pulling out or storing the opening / closing plate portion 14 relative to the eaves portion 13. The handle 142 extends in the Y-axis direction. The handle 142 is formed in a convex shape that is convex toward the front (+X direction). The handle 142 is provided near the center of the front surface of the opening / closing plate 141. The handle 142 is fixed to the opening / closing plate 141 at an end portion in the +Y direction and an end portion in the -Y direction by, for example, bolts and nuts (not shown). The shape and fixing position of the handle 142 are not limited to this.

[0031] The pressing plate 144 is formed in a substantially flat plate shape. An end of the pressing plate 144 in the +Y direction and an end of the pressing plate 144 in the -Y direction are bent into a substantially L shape. An end of the pressing plate 144 in the +Y direction and an end of the pressing plate 144 in the -Y direction are fixed to the opening / closing plate 141. The pressing plate 144 is provided near the center on the back surface of the opening / closing plate 141. The pressing plate 144 is inserted into the opening 131 from the +X direction and engages with the opening 131. The pressing plate 144 has a buffer material 1441 and a nut 141b. The buffer material 1441 is an example of a buffer member.

[0032] The cushioning material 1441 is fixed to the end face of the presser plate 144 in the -X direction, for example, by an adhesive. The cushioning material 1441 is formed in approximately the same shape as the end face of the presser plate 144 in the -X direction, but is slightly smaller than the end face of the presser plate 144 in the -X direction. The shape of the cushioning material 1441 is not limited to the above, and for example, two cushioning materials 1441 of the same shape may be fixed to the end face of the presser plate 144 in the -X direction so as not to overlap each other. The cushioning material 1441 abuts against the end of the filter 16 in the +X direction, and fixes the filter 16 in the X-axis direction.

[0033] The cushioning material 1441 is made of, for example, an elastomer such as rubber. As a result, the cushioning material 1441 elastically deforms when pressed against the filter 16 during the process of inserting the filter 16, thereby allowing for positional deviations due to dimensional errors of the filter 16 and the pressing plate 144 relative to the standards, and thus making it possible to suppress the occurrence of gaps between the filter 16 and the pressing plate 144.

[0034] The two nuts 141b are members that fix the opening / closing plate 141 and the pressing plate 144 to each other. The two nuts 141b are fixed to the back surface of the pressing plate 144 by, for example, welding. The two nuts 141b are provided between one bolt 13b and the handle 142 and between the other bolt 13b and the handle 142 in the Y-axis direction, respectively. The nuts 141b fasten the bolt 141a to fix the opening / closing plate 141 and the pressing plate 144 to each other.

[0035] (Filter replacement procedure) Next, the flow of the replacement work of the filter 16 will be described with reference to Fig. 8 and Fig. 9. In the replacement work of the filter 16, the worker performs the work from the front direction (+X direction) of the eaves part 13. Although not described in this embodiment, if the opening 131 is on the back side (-X direction) of the eaves part 13, the worker performs the work from the back side (-X direction).

[0036] Fig. 8 is a schematic diagram showing a process for removing the filter 16 from the switchgear 1 of the first embodiment. Fig. 9 is a schematic diagram showing a process for inserting the filter 16 from the switchgear 1 of the first embodiment. As shown in Fig. 8, when an operator removes the filter 16 from the eaves portion 13, first, the fastening of the nuts 13a and the bolts 13b is released, and the fixation between the eaves portion 13 and the opening / closing plate portion 14 is released. Then, the opening / closing plate portion 14 is pulled out from the eaves portion 13 in the +X direction.

[0037] This leaves filter 16 exposed in the front direction (+X direction) from eaves portion 13. The worker manually pulls filter 16 out toward the front (+X direction) from opening 131. Roof ventilation opening portion 15 is slightly inclined downward toward opening 131 with respect to housing portion 10. This allows the worker to easily pull filter 16 out toward the front direction (+X direction).

[0038] 9, the worker pulls out the filter 16 from the opening 131, and then inserts the filter 16A to be replaced from the opening 131 toward the rear (-X direction). Then, while arranging the filter 16A between the upper surface 151 of the roof ventilation opening portion 15 and the filter guide 17, the worker butts it against the first portion 18a of the drip-proof plate 18, and then aligns the opening / closing plate portion 14 so that the mounting hole 132 of the eaves portion 13 overlaps with the bolt 13b. Next, the gasket 1413 of the opening / closing plate 141 is brought into contact with the side surface 19 of the eaves portion 13, and the two bolts 13b are tightened with the two nuts 13a.

[0039] At this time, the cushioning material 1441 of the pressing plate 144, which is indirectly fixed to the eaves portion 13, comes into contact with the end face of the filter 16 in the +X direction. This prevents the filter 16 from moving in the front direction (+X direction). Furthermore, the first portion 18a of the drip-proof plate 18 comes into contact with the end face of the filter 16 in the -X direction. This prevents the filter 16 from moving in the rear direction (-X direction), and the filter 16 is positioned in the X-axis direction. Furthermore, the filter guide 17 comes into contact with the upper surface of the filter 16. This prevents the filter 16 from moving in the height direction (Z-axis direction), and the filter 16 is positioned in the height direction (Z-axis direction).

[0040] The pressing plate 144 and the filter 16 may be fixed to each other with bolts and nuts, etc., and may be inserted and removed as a unit through the opening 131. With this, the replacement work of the filter 16 is completed.

[0041] (Airflow straightening by filter guide) Next, the straightening of the airflow by the filter guide 17 will be described with reference to Fig. 2. As shown by the arrow in Fig. 2, the airflow heading upward (+Z direction) from the ventilation opening 153 flows into the inside of the eaves part 13. The airflow that has flowed into the inside of the eaves part 13 is straightened by the filter guide 17 and heads toward the front (+X direction). Furthermore, the airflow detours around the second part 18b of the drip-proof plate 18 from above (+Z direction) and heads toward the back (-X direction).

[0042] In this way, filter guide 17 has the effect of rectifying the airflow flowing into the inside of eaves portion 13 from ventilation opening 153. The airflow that has flowed into the inside of eaves portion 13 in this manner circulates inside switchgear 1.

[0043] As described above, in this embodiment, for example, the housing 10, the roof 11, the opening / closing plate 14, and the filter 16 are provided. Electrical equipment is disposed in the housing 10. The roof 11 has the eaves 13 and the opening 131. The eaves 13 is provided on the upper part of the housing 10 and extends from the side surface 10b of the housing 10 toward the outside of the housing 10. The opening 131 is provided on the side surface 10b of the eaves 13. The opening / closing plate 14 closes the opening 131 in an openable / closable manner. The filter 16 is provided in accordance with the ventilation opening 153 provided on the underside of the eaves 13, and is provided so as to be insertable and detachable from the opening 131.

[0044] In conventional switchgear, when replacing an air filter, it is necessary to remove the roof ventilation opening that supports the air filter from below, the drip-proof plate that touches the air filter, etc. This requires the worker to remove the fastening members while supporting multiple parts with one hand, or the work to be done by multiple people, reducing work efficiency.

[0045] Meanwhile, in the switchgear 1 of the present embodiment, the filter 16 can be replaced by being inserted and removed in the X-axis direction through the opening 131 of the eaves portion 13 that is disposed at a position different from the roof ventilation opening portion 15. In the switchgear 1 of the present embodiment, when replacing the filter 16, it is not necessary to remove the roof ventilation opening portion 15, the drip-proof plate 18, and the like together with the filter 16. That is, according to the switchgear 1 of the present embodiment, it is possible to improve the workability when replacing the filter 16.

[0046] Moreover, the switchgear 1 of the present embodiment further includes a drip-proof plate 18 that is disposed on the lower surface of the eave portion 13 and fixes the filter 16 in a direction toward the inside of the housing portion 10.

[0047] In the switchgear 1 of this embodiment, when an operator replaces the filter 16, the filter 16 is slid in the X-axis direction and the filter 16 is inserted and removed from an opening 131 provided in the X-axis direction of the eaves portion 13, thereby enabling replacement. The position at which the filter 16 is disposed is a lower portion of the filter guide 17 spaced in the X-axis direction from the opening 131 through which the filter 16 is inserted and removed, and after replacement of the filter 16, the filter 16A needs to be fixed in the above-mentioned position. The end of the filter 16 in the +X direction is fixed and positioned by the pressing plate 144 so as not to move in the +X direction, and it is desirable that the end of the filter 16 in the -X direction is also fixed and positioned so as not to move in the -X direction at the same time.

[0048] In the switchgear 1 of the present embodiment, after the filter 16 is inserted, the filter 16 is prevented from moving in the -X direction by the drip-proof plate 18. That is, after the filter 16 is replaced, the filter 16 is fixed and positioned by the pressing plate 144 and the drip-proof plate 18 so as not to move in the X-axis direction. That is, the switchgear 1 of the present embodiment can improve the positioning accuracy of the filter 16 when the filter 16 is replaced.

[0049] Moreover, in the switchgear 1 of this embodiment, the opening / closing plate portion 14 further includes a gasket 1413 that comes into contact with the side surface 19 of the eave portion 13 to seal the opening portion 131 .

[0050] In conventional switchgears, there is no opening on the side surface of the eaves portion, and therefore there is no risk of rainwater entering from the side surface of the eaves portion. However, in the switchgear 1 of this embodiment, an opening 131 is provided on the side surface 19 of the eaves portion 13, and therefore the opening 131 needs to be closed by the opening / closing plate portion 14 to prevent rainwater from entering the inside of the eaves portion 13 from the opening 131.

[0051] In the switchgear 1 of this embodiment, when the opening / closing plate 14 is fixed to the eaves portion 13, the gasket 1413 closes the gap between the eaves portion 13 and the opening / closing plate 14, thereby improving the airtightness of the eaves portion 13. As a result, the switchgear 1 of this embodiment can improve the waterproof performance of the eaves portion 13.

[0052] In the switchgear 1 of the present embodiment, the opening / closing plate portion 14 further includes a pressing plate 144 extending in a direction toward the inside of the housing portion 10. The pressing plate 144 includes a cushioning material 1441 for fixing the filter 16 in the direction toward the inside of the housing portion 10.

[0053] When the filter 16 is replaced in the switchgear 1 of this embodiment, the replaced filter 16A is inserted in the -X direction from the opening 131, and then the end of the filter 16A in the -X direction is pressed against the first portion 18a of the drip-proof plate 18, thereby positioning the filter 16A in the -X direction. Next, the end of the filter 16A in the +X direction is pressed against the pressing plate 144 (the cushioning material 1441), thereby positioning the filter 16A in the +X direction.

[0054] At this time, filter 16A is pressed by the operator against drip-proof plate 18, which is arranged in the -X direction together with pressing plate 144, and when the force acting in the -X direction by the operator is released, the end of filter 16A in the +X direction is positioned in the +X direction by pressing plate 144 of opening / closing plate portion 14, which is fixed by nut 13a and bolt 13b.

[0055] In this state, if there is variation in the dimensional accuracy of the filter 16A and the pressing plate 144 in the X-axis direction relative to the standard, a gap may occur between the filter 16A and the pressing plate 144 (the cushioning material 1441). If such a gap occurs, the filter 16A may be disposed away from the designed position of the switchgear 1, and there is a risk that the salt resistance, dustproofing, insectproofing, and other functions of the filter 16A may not be fully exhibited.

[0056] In the switch gear 1 of this embodiment, when the end of the filter 16 (filter 16A) in the +X direction is positioned in the +X direction by the pressure plate 144 of the opening / closing plate portion 14 fixed to the eaves portion 13 by nuts 13a and bolts 13b, the cushioning material 1441 can expand and contract depending on the magnitude of the force that the filter 16 (filter 16A) receives from the pressure plate 144 to which the filter 16 (filter 16A) is indirectly fixed to the eaves portion 13.

[0057] In other words, the cushioning material 1441 is disposed under the filter guide 17 after the filter 16 is replaced with the filter 16A, and when the cushioning material 1441 is positioned in the X-axis direction by the first portion 18a of the drip-proof plate 18 and the presser plate 144, it can absorb the dimensional error of the filter 16A and the presser plate 144 with respect to the standard in the X-axis direction. That is, the switchgear 1 of the present embodiment can prevent the filter 16 (filter 16A) from being disposed in a position different from the design position of the switchgear 1, and can thus prevent the occurrence of a defect in which the functions of the filter 16 (filter 16A), such as salt resistance, dust resistance, and insect resistance, are not fully exhibited.

[0058] In the switch gear 1 of this embodiment, the pressing plate 144 and the filter 16 can be inserted into and removed from the opening 131 as a unit.

[0059] If the pressing plate 144 and the filter 16 can be inserted and removed integrally through the opening 131, when the filter 16 is replaced in the switchgear 1 of this embodiment, the filter 16 is simultaneously pulled out when the opening / closing plate 14 is pulled out from the eaves 13 in the +X direction in the process of removing the filter 16 of the switchgear 1 of the first embodiment shown in Fig. 8. Furthermore, when the filter 16A to be replaced is inserted from the opening 131 toward the rear (-X direction) in the process of inserting the filter 16A of the switchgear 1 of the first embodiment shown in Fig. 9, the worker can easily align the opening / closing plate 14 so that the mounting hole 132 of the eaves 13 and the bolt 13b overlap. That is, the worker can work more efficiently in the process of removing and inserting the filter 16 of the switchgear 1.

[0060] In the switchgear 1 of this embodiment, the opening / closing plate portion 14 can be fixed to the side surface 19 of the eave portion 13.

[0061] When the opening / closing plate portion 14 is fixed to the side surface 19 of the eaves portion 13, the worker performs the work of loosening and tightening the nuts 13a and bolts 13b from the front direction (+X direction) of the eaves portion 13 during the work of replacing the filter 16. That is, the worker can perform the work of loosening and tightening the nuts 13a and bolts 13b and the work of inserting and removing the filter 16 from the same direction, which in turn makes it possible to perform the work of replacing the filter 16 more efficiently.

[0062] Moreover, the switchgear 1 of the present embodiment further includes a filter guide 17 that rectifies the airflow flowing from the ventilation opening 153 into the inside of the eaves portion 13. The filter guide 17 fixes the filter 16 in the height direction (Z-axis direction).

[0063] In the process of inserting the filter 16A of the switchgear 1 of the first embodiment shown in Fig. 9, the filter 16A is abutted against the first portion 18a of the drip-proof plate 18 while being disposed between the upper surface 151 of the roof ventilation opening portion 15 and the filter guide 17. At this time, the filter guide 17 abuts against the upper surface of the filter 16. This prevents the filter 16 from moving in the height direction (Z-axis direction), and positions the filter 16 in the height direction (Z-axis direction). That is, the switchgear 1 of the present embodiment can prevent the filter 16 (filter 16A) from being disposed outside the designed position of the switchgear 1, and can thus prevent the occurrence of a defect in which the functions of the filter 16 (filter 16A), such as salt resistance, dustproofing, and insectproofing, are not fully exhibited.

[0064] Second embodiment A switchgear 1A of the second embodiment will be described below with reference to Fig. 10. The switchgear 1A in the second embodiment is obtained by partially modifying the configuration of the overhanging portion 13 of the first embodiment described with reference to Fig. 2, and the same configuration as the overhanging portion 13 of the first embodiment will be described with the same reference numerals as those of the overhanging portion 13.

[0065] Fig. 10 is a schematic enlarged view of a part of the overhanging portion 13 of the switchgear 1A of the second embodiment, and Fig. 11 is a front view of a part of the overhanging portion 13 of the switchgear 1A of the second embodiment.

[0066] As shown in Fig. 10, roof ventilation opening section 15A (the lower surface of eaves section 13) is inclined at angle θ with respect to the housing section 10 in a downward direction toward the opening 131. Moreover, roof ventilation opening section 15A of the second embodiment is fixed to the housing section 10 with a part of the front side (+X direction side) bent downward (-Z direction) at angle θ. For this reason, between the end of roof ventilation opening section 15A in the +X direction and eaves section 13, there is a gap G that connects the inside and outside of eaves section 13. Note that angle θ is an acute angle, and its magnitude is determined according to the design of the switchgear 1A.

[0067] The filter 16 is also disposed on the upper surface 151 in a state inclined at an angle θ in a downward direction toward the opening 131, similar to the roof ventilation opening portion 15A. As shown in FIG. 10, the opening / closing plate portion 14 is provided lower (in the -Z direction) than the opening / closing plate portion 14 in the first embodiment. As shown in FIG. 11, the opening 131A is provided lower (in the -Z direction) than the opening 131 in the first embodiment. The cushioning material 1441 of the pressing plate 144, which is indirectly fixed to the eaves portion 13, abuts against the filter 16, which is provided at an angle relative to the housing portion 10, in the X-axis direction. This prevents the filter 16 from moving in the +X direction.

[0068] As described above, in this embodiment, for example, roof ventilation opening portion 15A (the lower surface of eaves portion 13) is inclined in a downward direction toward opening portion 131A with respect to housing portion 10. A gap G is provided between roof ventilation opening portion 15A (the lower surface of eaves portion 13) and side surface 19 of eaves portion 13.

[0069] In conventional switchgears, the filter is generally disposed on the approximately horizontal surface of the roof ventilation opening. The end of the roof ventilation opening and the eaves are in contact with each other, resulting in no gaps. In this structure, some of the rainwater that enters through the roof ventilation opening is not discharged to the outside of the eaves, which can cause corrosion inside the roof ventilation opening. For this reason, it is necessary to protect the eaves with a protective sheet or the like, and improvements in workability are desired.

[0070] On the other hand, in the switchgear 1 of this embodiment, rainwater that enters through the roof ventilation opening portion 15A flows along the upper surface 151 of the roof ventilation opening portion 15A in a direction downwardly (in the +X direction) along the slope of the roof ventilation opening portion 15A, and is discharged to the outside of the eave portion 13 through the gap G between the end of the roof ventilation opening portion 15A in the +X direction and the eave portion 13.

[0071] That is, the switchgear 1 of this embodiment can discharge rainwater that has entered through the roof ventilation opening portion 15A to the outside of the eaves portion 13 through the gap G by the action of gravity. Therefore, when replacing the filter 16, the worker does not need to protect the eaves portion 13 with a protective sheet or the like to prevent rainwater from entering the inside of the eaves portion 13, and thus the workability when replacing the filter 16 can be improved.

[0072] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0073] 1, 1A switchgear 10. Housing 10a Upper 10b side 11 Roof 13 Eaves 14 Opening and closing plate 16, 16A Filter 17 Filter Guide 18 Drip-proof plate 19 Side 131, 131A opening 144 Retaining plate 152 Bottom surface 153 Ventilation vent 1413 Gasket 1441 Cushioning material G Gap θ Inclination angle of roof vent with respect to the housing

Claims

1. a housing in which the electrical device is disposed; a roof portion provided on an upper portion of the housing portion, the roof portion having an eave portion extending from a side surface of the housing portion toward an outside of the housing portion and an opening portion provided on the side surface of the eave portion; an opening / closing plate portion that closes the opening portion in an openable and closable manner; a filter disposed in alignment with a ventilation opening provided on the underside of the eaves portion and removably provided through the opening; The switchgear comprises:

2. the lower surface is inclined downwardly toward the opening with respect to the housing portion, A gap is provided between the lower surface and the side surface of the eave portion. The switchgear according to claim 1.

3. The filter further includes a partition plate disposed on a lower surface of the eave portion and configured to fix the filter in a direction toward the inside of the housing portion. The switchgear according to claim 1 or 2.

4. The opening / closing plate portion further includes a seal member that contacts a side surface of the eave portion to seal the opening. The switchgear according to claim 1 or 2.

5. The opening and closing plate portion further includes a fixing member extending in a direction toward the inside of the housing portion, The fixing member has a buffer member that fixes the filter in a direction toward the inside of the housing portion. The switchgear according to claim 1 or 2.

6. The fixing member and the filter are integrally insertable and detachable from the opening. The switchgear according to claim 5.

7. The opening and closing plate portion can be fixed to the side surface of the eave portion. The switchgear according to claim 1 or 2.

8. A guide portion for rectifying the airflow flowing into the inside of the eaves portion from the ventilation opening is further provided, The guide portion fixes the filter in a height direction. The switchgear according to claim 1 or 2.

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