JP2006129645A - Mounting structure in distribution box of air molded switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure in a distribution box of an air molded switch that makes it possible to repair only a portion that needs to be repaired for deterioration actually found on site, by incorporating a method by state-monitoring preservation based on deterioration diagnosing technology, when replacing an electric power distribution facility. <P>SOLUTION: Bottom portion, side, and top portion sealing covers 1, 2, 3 are each provided inside the distribution box B. Partitions are provided in a standing position on the bottom portion sealing covers 1 and the air molded switch A is mounted between the partitions on the bottom portion sealing covers 1. The ends of rise cables 30 are configured to cover bushings 31 at the bottom portion switch cable side of a monopole mold. Spaces formed by a mechanism board 18 mounted in front of the back place 54 of the distribution box A, each of the sealing covers 1, 2, 3 and the air molded switch A are enclosed. When the air molded switch A mounted inside the distribution box B is repaired, the back plate 54 of the distribution box B is removed to make it possible to repair the single unit of each air molded switch A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a distribution box for a multi-circuit branch air mold switch (hereinafter referred to as “mold switch”) used for opening and closing a high-voltage underground distribution line disposed inside a distribution box installed on the road. It is related with the attachment structure.

Conventionally, a distribution box in which a plurality of switches are integrated in a plurality of circuits is used for multi-circuit branch switching of a high-voltage underground distribution line. Inside this distribution box, switches are installed side by side, and for each of the three-phase phases, a bus line is connected to one terminal of each of these switches, and the underground cable is raised from the ground to the other terminal. Is connected.

On the other hand, in the era of complete electricity liberalization, thorough rationalization is also required for the maintenance and operation of power distribution equipment. In other words, rationalization is required in the field of maintenance such as repair and replacement of switches as well as the development of switches that reduce costs. In the past, the power distribution equipment was replaced with a fixed renewal period, but this method automatically replaces even those that do not require replacement, and there are multiple conductive parts of the mold switch. A circuit-integrated type or a unit that is incorporated in an airtight state in an integrated inner box has to be replaced for each distribution box when a problem occurs even in one circuit or one phase. In this way, the conventional method is irrational, contrary to global environmental conservation, and uneconomical.

Therefore, the present invention incorporates a method of state monitoring and maintenance based on the deterioration diagnosis technology when replacing the power distribution equipment, and it is easy to repair or replace only those that need to be repaired or replaced due to actual deterioration on site. The present invention provides a mounting structure for a switch box that can be used to solve the above-mentioned problems and rationalize the maintenance operation of power distribution equipment.

The invention of claim 1 is provided with a bus connecting terminal at the upper part, a cable connecting terminal at the lower part, and three single-pole molds each provided with an open / close contact in parallel to form three phases, The mechanism board is provided in contact with the front face of each of the three-phase single-pole molds so as to close the front opening of the single-pole mold, and the mechanism section is arranged so that the switching contacts of each phase move integrally on the mechanism board. In a distribution box in which a plurality of air mold switches with a mechanism cover provided on the mechanism section are installed in parallel, a frame is extended vertically and horizontally on the channel base at the bottom of the distribution box to form a substantially box shape The frame is horizontally placed at a certain height on both sides of the frame, and a lower sealing cover is provided. Install each plate horizontally on the top of each side sealing cover An upper airtight cover is provided, and a metal partition wall is provided on the lower airtight cover so as to be positioned between each air mold switch installed and separated from the side surface of each air mold switch. Each of the upper sealing cover, the lower sealing cover, the side sealing covers, and the rear end surfaces of the partition walls are brought into contact with the rear plate of the distribution box, and the upper sealing cover, the lower sealing cover, and the side sealing cover. The buses of the respective phases for branching and connecting the respective air mold switches are arranged in the upper part of the space formed by the above.

The air mold switch is installed between the side sealing covers on the upper surface of the lower sealing cover and the partition walls, the air mold switches and the buses are connected, and the lower front of the monopolar mold A switch cable side bushing having a cable connection terminal is provided, a terminal of a rising cable is connected to each of these cable connection terminals, and the terminal of these rising cable covers each switch cable side bushing, Provided in front of each of the plurality of air mold switches installed is a mechanism board extending a certain length upward beyond the opening of each monopolar mold, and the shape and size of the mechanism board on each mechanism board. A mechanism cover corresponding to each is provided, and the inside of each aerial mold switch is sealed by each mechanism board and each mechanism cover. The bushing protrudes downward from the mechanism board, and is provided with a sealing member that closes the gap between the lower sealing cover and the side sealing cover or the partition wall around the switch cable side bushings, the rear plate of the distribution box, the upper sealing cover, When the inside of the space formed by the lower sealing cover, each side sealing cover, each mechanism board with each mechanism cover and the above sealing member is sealed, and when repairing or replacing the air mold switch installed in the distribution box, Remove the back panel of the distribution box, or remove the ceiling plate of the distribution box and remove the upper sealing cover, and release or repair the connection with the busbar with each air mold switch alone. It was set as the attachment structure in the distribution box of an air mold switch.

In the invention of claim 2, the left and right edges of each mechanism substrate of each air mold switch are bent at a substantially right angle to the front side to provide a bent edge, and the front side of each bent edge is provided. Provided as a lower end inclined part by cutting off the corner of the lower end part, and provided in the lower part of each front face of each partition wall and each side sealing cover by horizontally projecting a square bar-like temporary placement table to the front, A female screw is provided in the approximate center of the front, both sides of the upper surface of each temporary mounting table are protruded on both sides of the partition wall or side sealing cover, a tongue piece having a bolt through hole is separately provided at the front, and a convex portion with a tapered rear is provided. When installing the air mold switch between the side sealing cover and the partition wall, or between the partition walls, the right and left partition walls or the side sealing cover of the lower sealing cover are provided. The air mold switch machine on each temporary table A female screw in which the lower end inclined portions of the bent edges on both sides of the substrate are respectively mounted, the air mold switch is placed on the lower sealing cover, and the bolt through hole of the switch mounting bracket is provided in front of the temporary table. Abutting on the part, tightening the bolt through the bolt through hole of the switch mounting bracket and advancing the bolt into the female screw of the temporary mounting base, and an inclined convex portion of the switch mounting bracket with the progress of the bolt The lower end inclined portion of each bent edge of the mechanism substrate of the above-mentioned air mold switch is raised upward, and the air is moved to the position where the bus connection terminal and the bus-side terminal of the air mold switch are joined. The mounting of the air mold switch in the distribution box according to claim 1, wherein the mechanism board is fixed to the frame of the frame body with bolts and nuts in a state where the entire mold switch is lifted. It was the elephant.

According to a third aspect of the present invention, the sealing member for sealing the periphery of the bushing on the side of the switch cable is provided with a protruding edge having a constant width on the outer periphery of the substantially rectangular insulating rubber plate, and is arranged side by side at substantially equal intervals on the insulating rubber plate. Three round openings are provided on the outer periphery of the insulating rubber plate, and a deformed rectangular tube-shaped hood cover that can be integrated with the outer periphery of the insulating rubber plate is put on the outer periphery of the insulating rubber plate to the side of the protruding edge, and is integrated with the hood cover. The formed insulating rubber plate is projected to the switch cable side bushing, the switch cable side bushing is projected from each opening of the insulating rubber plate, and the outer periphery of the switch cable side bushing and each opening of the insulating rubber plate The upper part of the hood cover is fixed to a side L-shaped plate provided along the lower edge of the mechanism substrate, and the lower part of the hood cover is fixed to the lower sealing cover. Then, each opening of the insulating rubber plate is fitted into the opening of the T-type cable terminal by closing the outer periphery of each of the insulating cylinders without gaps, and the insulating cable is covered with a bushing on the switch cable side. Due to the protruding edge of the insulating rubber plate protruding by a certain width from the outer periphery of the hood cover, the gap between the back side of the hood cover and the partition wall or the side sealing cover, and between the bottom surface of the hood cover back and the lower sealing cover Each gap is closed, and the gap between the left and right ends of the upper surface of the hood cover and the partition wall or the side sealing cover is closed with packing provided along both edges of the upper surface of the hood cover, and the lower end of the mechanism board on the lower back surface of the mechanism board A gap between the side L-shaped plate provided along the edge and the lower surface of the front end of the mold switch, and a gap between the left and right ends of the side L-shaped plate and the partition wall or the side sealing cover, respectively. It was set as the attachment structure in the distribution box of the air mold switch in any one of the said Claim 1 or 2 made into the structure closed with the substantially L-shaped packing.

According to the inventions of claims 1 to 3, in the distribution box, a metal partition is provided separately from the side of each mold switch between the mold switch circuits, and each mold switch is isolated. Even if an internal short-circuit accident occurs in one circuit, the short-circuit current flows to the partition wall, and the influence of the short-circuit accident does not reach the adjacent circuit and does not shift to the adjacent circuit. I can do it. In addition to the on-site replacement of each mold switch, partial repair and replacement including replacement of sensors for IT and the like is extremely easy. As a result, only those that need repair or replacement can be handled, which greatly contributes to cost savings.

According to the invention of claim 2, in addition to the above-described effects, the left and right edges of each mechanism board of the mold switch are bent at a substantially right angle to the front side to form bent edges, and each of these bent edges The lower edge of the front side of the front wall is cut out and provided as a lower edge inclined part, a temporary mounting base is provided at the lower part of each front face of each partition wall, etc., and the mold switch is floated by a substantially wedge-shaped switch mounting bracket, Since it is installed in combination, it is very easy to attach or remove heavy mold switches on-site by hand even if there is no space between adjacent mold switch circuits. As mentioned above, even if the problem that cannot be achieved with the conventional distribution box, which can be exchanged by one person with a single circuit of the mold switch, it is possible to narrow between each circuit. The integrated distribution box has the same number of circuits and outer box dimensions, and is highly versatile.

According to the invention of claim 3, the sealing member for sealing the periphery of the bushing on the side of the switch cable is provided with a protruding edge having a constant width on the outer periphery of the substantially rectangular insulating rubber plate, and substantially equidistant on the insulating rubber plate. The side cover and three circular openings are provided, and a deformed rectangular tube-shaped hood cover that can be joined and integrated with the outer periphery of the insulating rubber plate is put on the outer periphery of the insulating rubber plate to the side of the protruding edge, The integrated insulating rubber plate is made into the switch cable side bushing, the switch cable side bushing is protruded from each opening of the insulating rubber plate, and the outer periphery of the switch cable side bushing and the insulating rubber plate An annular gap is provided between each of the openings and the upper portion of the hood cover is fixed to a side L-shaped plate provided along the lower edge of the mechanism substrate, and the lower portion of the hood cover is fixed to the lower sealing cover. Fix and fit each opening of the insulating rubber plate with the outer periphery of the insulating tube protruding to the switch side of the T-shaped cable terminal without any gap, and cover the bushing on the switch cable side with the insulating tube, Due to the protruding edge of the insulating rubber plate protruding from the outer periphery of the hood cover by a certain width, the gap between the back surface of the hood cover and the partition wall or the side sealing cover, and between the bottom surface of the hood cover back and the lower sealing cover And the gap between the left and right ends of the upper surface of the hood cover and the partition wall or the side sealing cover is closed with packing provided along both edges of the upper surface of the hood cover, and the mechanism board on the lower back surface of the mechanism board is closed. The gap between the side L-shaped plate provided along the lower edge and the front end lower surface of the mold switch, and the gap between the left and right ends of the side L-shaped plate and the partition wall or side sealing cover Each of them is configured to be sealed with a substantially L-shaped packing, so even in humid environments, the moisture absorption of the resin used in the bushing on the switch cable side can be suppressed, the life of the mold switch can be extended, and the equipment is reliable Is high.

A front-side opening for a single-pole mold that has three buses, with a bus-connecting terminal at the top, a cable-connecting terminal at the bottom, and three single-pole molds with open / close contacts inside. A mechanism board is provided in contact with the front surface of each of the three-phase single-pole molds so as to close the part, and a mechanism part is provided on the mechanism board so that the switching contacts of each phase move integrally. In a distribution box in which a plurality of aerial mold switches provided with a mechanism cover are installed in parallel, on the channel base at the bottom of the distribution box, a frame is formed that extends vertically and horizontally to form a substantially box shape. The plate body is horizontally passed to a certain height on both sides of the frame body to provide a lower sealing cover, the plate body is erected on both the left and right sides of the lower sealing cover, and side sealing covers are provided, respectively. Pass the plate horizontally to the top of the cover, On the lower sealing cover, metal partition walls are erected on the lower airtight cover so as to be positioned between the air mold switches to be installed and separated from the side surfaces of the air mold switches. The upper sealing cover, the lower sealing cover, the side sealing covers, and the rear end surfaces of the partition walls are brought into contact with the rear plate of the distribution box, respectively, and are formed by the upper sealing cover, the lower sealing cover, and the side sealing cover. The buses of the respective phases for branching and connecting the respective air mold switches are arranged in the upper part of the space.

The air mold switch is installed between the side sealing covers on the upper surface of the lower sealing cover and the partition walls, the air mold switches and the buses are connected, and the lower front of the monopolar mold A switch cable side bushing having a cable connection terminal is provided, a terminal of a rising cable is connected to each of these cable connection terminals, and the terminal of these rising cable covers each switch cable side bushing, Provided in front of each of the plurality of air mold switches installed is a mechanism board extending a certain length upward beyond the opening of each monopolar mold, and the shape and size of the mechanism board on each mechanism board. A mechanism cover corresponding to each is provided, and the inside of each aerial mold switch is sealed by each mechanism board and each mechanism cover. The bushing protrudes downward from the mechanism board, and is provided with a sealing member that closes the gap between the lower sealing cover and the side sealing cover or the partition wall around the switch cable side bushings, the rear plate of the distribution box, the upper sealing cover, When the inside of the space formed by the lower sealing cover, each side sealing cover, each mechanism board with each mechanism cover and the above sealing member is sealed, and when repairing or replacing the air mold switch installed in the distribution box, Remove the back panel of the distribution box, or remove the ceiling plate of the distribution box and remove the upper sealing cover, and release or repair the connection with the busbar with each air mold switch alone. .

In addition, the left and right edges of each mechanism board of each air mold switch are bent at a substantially right angle to the front side to provide a bent edge, and the corner of the lower end on the front side of each bent edge is provided. Notched and provided as a lower slope part, each bar and each side sealing cover are provided with a square bar-like temporary mounting table horizontally and projecting to the front at the lower part of each front surface, and a female screw at the approximate center of the front of each temporary mounting table The upper and lower sides of each temporary mounting table are protruded on both sides of the partition wall or side sealing cover, and a tongue piece having a bolt through hole is separately provided at the front, and a substantially wedge-shaped opening and closing having a tapered convex portion at the rear. When installing the air mold switch between the side sealing cover and the partition wall, or between each partition wall, the right and left partition walls on the lower sealing cover or each temporary sealing table of the side sealing cover Both sides of the mechanism board of the air mold switch Place the lower end inclined part of the curved edge on each of the air mold switch on the lower hermetic cover, contact the bolt through hole of the switch mounting bracket on the female screw part provided on the front of the temporary table, The bolt is passed through the bolt through hole of the switch mounting bracket, the bolt is tightened and the bolt is advanced into the internal thread of the temporary table, and the inclined convex portion of the switch mounting bracket is advanced as the bolt progresses. Lift up the lower end slope of each bent edge of the mechanism board of the air mold switch, and move the entire air mold switch to the position where the bus connection terminal and the bus terminal on the air mold switch join. In the lifted state, the mechanism substrate was fixed to the frame of the frame body with bolts and nuts.

Further, the sealing member for sealing the periphery of the switch cable side bushing is provided with a protruding edge having a constant width on the outer periphery of the substantially rectangular insulating rubber plate, and three circular openings side by side at substantially equal intervals on the insulating rubber plate. A hood cover with a deformed rectangular tube that can be joined and integrated on the outer periphery of the insulating rubber plate is covered on the outer periphery of the insulating rubber plate to the side of the protruding edge, and an insulating rubber plate integrated with the hood cover is provided. The switch cable side bushing is protruded from each opening of the insulating rubber plate and annularly formed between the outer periphery of the switch cable side bushing and each opening of the insulating rubber plate. The upper portion of the hood cover is fixed to a side L-shaped plate provided along the lower edge of the mechanism substrate, the lower portion of the hood cover is fixed to the lower hermetic cover, and the insulation is covered. The outer periphery of each insulation tube protruding to the switch side of the T-type cable end is fitted into each opening of the cable plate without gaps, and the switch cable side bushing is covered with the insulation tube, and the outer periphery of the hood cover The gap between the back side of the hood cover and the partition wall or the side sealing cover and the gap between the bottom side of the hood cover and the lower sealing cover are respectively closed by the protruding edge of the insulating rubber plate protruding by a certain width from The gap between the left and right ends of the upper surface of the hood cover and the partition wall or the side sealing cover is closed with packing provided along both end edges of the upper surface of the hood cover, and along the lower edge of the mechanism substrate on the lower back surface of the mechanism substrate. The gap between the provided side L-shaped plate and the lower surface of the front end of the mold switch, and the gap between the left and right ends of the side L-shaped plate and the partition wall or the side sealing cover are respectively substantially L-shaped. It plugged with gold.

Embodiments of the present invention will be described below with reference to the drawings.
FIG.1 and FIG.2 shows a mode that the mold switch A was installed in the distribution box B of the Example of this invention. As shown in FIG. 3, the distribution box B is provided with a metal frame 52 formed in a substantially box shape by extending a frame vertically and horizontally on a channel base 51 serving as a base. Opening and closing doors are provided on the front of the plate, and plates are provided on the back, left and right sides, and the top, respectively.

As shown in FIG. 3, the lower angle 5 is formed by passing two angles forward and backward to a certain height on both the left and right sides of the frame body 52 on the channel base 51 at the bottom of the distribution box B. Both ends of the lower angle 5 are fixed to the first horizontal frame 52b by welding. A lower sealing cover 1 is provided on these lower angles 5 by horizontally passing a metal plate. At both the left and right ends of the lower sealing cover 1, metal plate bodies are erected and the side sealing covers 2 are provided along vertical frames 52 a provided on the left and right sides of the frame body 52. The length and size of each of the side surface sealing covers 2 sufficiently cover the mold switch A and the connection part of the bus 53 above the mold switch A. Further, an upper sealing cover 3 is provided by horizontally passing a metal plate on the upper side of each side sealing cover 2.

The nut 4 shown in FIG. 4 is welded to the front and rear two locations on the outer surface of the lower end of each side sealing cover 2, and each side sealing cover 2 is attached to the left and right ends on the lower sealing cover 1. When erected, through holes into which the bolts 4a are inserted are provided at locations corresponding to these nuts 4 in the lower sealing cover 1, respectively. In attaching these side sealing covers 2, each side sealing cover 2 is erected on the lower sealing cover 1, and power distribution is performed on each through-hole of the lower sealing cover 1 and before and after the lower surface of the lower sealing cover 1. Align the positions of the through holes drilled in advance in the horizontal pieces of the two lower angles 5 that are horizontally passed in the box B, and insert the bolts 4a from the lower sides of the horizontal pieces of the lower angles 5 into these through holes. 4, each side sealing cover 2 is fixed to the lower sealing cover 1 and the lower angle 5.

As shown in FIG. 4, nuts 7 are fixed to the two outer side surfaces of the upper end portion of each side surface sealing cover 2 by welding the side surfaces thereof, and correspond to the positions of these nuts 7. Through holes are formed in front and rear of both ends of the upper sealing cover 3 in advance, bolts 6 are respectively inserted into the through holes from above and screwed to the two nuts 7, and the upper sealing cover 2 is sealed to the upper side. The cover 3 is fixed. Thus, the upper sealing cover 3 is fixed to the upper part of the side sealing covers 2 on both sides.

Further, as shown in FIG. 3, a square-shaped opening 8 is provided on the rear side of the intermediate portion of each side sealing cover 2, and the intermediate angle 9 is horizontally passed through these openings 8 so that the intermediate angle 9 and the frame The left and right second horizontal frames 52c of the body 52 are brought into contact with each other, and these are fastened and fixed with a countersunk screw (not shown), and a contact plate 10 is applied to the remaining opening 8 of each side sealing cover 2. It is blocking. In addition, a metal switch upper fixing square 11 is provided on the front end of the upper hermetic cover 3 along the edge, and the switch upper fixing square 11 is provided on the left and right vertical frames. It is fixed by welding to 52a.

On the lower hermetic cover 1, metal partition walls 12 are equidistantly spaced in parallel with the side hermetic cover 2 as shown in FIG. 4 are standing upright. These partition walls 12 have a rectangular shape, and are provided on the lower end surface of each partition wall 12 by welding bolts 13 shown in FIG. 5 and FIG. When standing up, the lower sealing cover 1 is provided with through holes into which the bolts 13 are fitted at respective locations corresponding to the bolts 13. Moreover, as shown in FIG. 6, the recessed part is each provided in the upper surface of the rear side of the upper end part of each partition 12, and the nut 14 is welded and provided in these recessed parts.

When installing each of these partition walls 12, two lower angles are set up on the lower sealing cover 1, and are horizontally passed over the through holes of the lower sealing cover 1 and before and after the lower surface of the lower sealing cover 1. 5, the positions of the through holes respectively drilled in the horizontal pieces 5 are aligned, bolts 13 are fitted into these through holes and protruded downward, and nuts 13 a are screwed onto the bolts 13 from the lower angles 5 side, The partition wall 12 is fixed to the lower sealing cover 1 and the front and rear lower angles 5. Further, the positions of the through holes previously drilled in the horizontal piece of the intermediate angle 9 and the nuts 14 at the upper ends of the partition walls 12 are aligned, and bolts 15 are screwed onto the nuts 14 from the intermediate angles 9 through the through holes. Each partition 12 is fixed to the intermediate angle 9. In this way, the partition wall 12 is fixed at one upper position and two lower positions.

Further, as shown in FIG. 3, the front side of such a partition wall 12 is provided in a substantially trapezoidal shape with its upper end protruding upward by a certain length, and a mold switch A is interposed between two adjacent partition walls 12. When installing, it is easy to insert into guide fittings 63 (see FIG. 27 and FIG. 28) that are bolted to the left and right ends of the back of the mechanism board, which will be described later, and the corner of the lower end on the front side of the partition 12 When the switch cable side bushing 23 and the T-type cable terminal 31 of the rising cable 30 are connected, the T-type cable terminal 31 is not damaged. A rectangular cutout of a certain size is provided at the upper part of the portion where the corner of the lower end portion on the front side of each partition wall 12 is cut out. A rectangular bar-like temporary table 16 is fitted horizontally into each notch and welded, and a part of the temporary table 16 is provided on the front side so as to protrude from the front center of the temporary table 16. An internal thread is provided on the inside. Further, both upper surface sides of each temporary placement table 16 protrude on both sides of the partition wall 12. The temporary table 16 is also provided in the lower part of the left and right side surface sealing covers 2 in the same manner.
Separately, as shown in FIGS. 24 to 26, a wedge-shaped convex portion 17a having an inclined upper surface, a tongue piece 17c having an annular bolt through hole 17b at the front end of the lower surface, and a tapered rear portion are provided. A mounting bracket 17 is prepared.

The rear end surfaces of the upper sealing cover 3, the lower sealing cover 1 and the side sealing cover 2 are brought into contact with the back plate 54 of the distribution box B, respectively. At this time, the packing 55 is provided inside the back plate 54 of the distribution box B with which the rear end surfaces of the upper sealing cover 3, the lower sealing cover 1, and the left and right side sealing covers 2 are in contact. The rear end surfaces of the lower sealing cover 1 and the left and right side sealing covers 2 are in contact with these packings 55 (FIG. 6 shows the positional relationship among the lower sealing cover 1, the back plate 54, and the packing 55). Further, a packing 29 is provided at each connection location of the upper sealing cover 3, the lower sealing cover 1, each side sealing cover 2, and the switch upper fixing square member 11 (in FIG. 4, the upper sealing cover 3, the lower sealing cover). The arrangement relationship between the cover 1 and the side sealing cover 2 and the packing 29 is shown), and the inside of the space formed by the upper sealing cover 3, the lower sealing cover 1, each side sealing cover 2, the back plate 54 and the like is thereby sealed. (See FIG. 29).

The mold switch A in the Example of this invention is demonstrated.
7 and 8 show a mold switch A according to an embodiment of the present invention. The monopolar mold C shown in FIG. 9 that constitutes the mold switch A of the present invention has a flat box body that is formed by integral resin molding with an insulating material without applying an electric field relaxation treatment, and the two flat Surfaces are provided as left and right side surfaces, and a vertically long rectangular front surface of the erected box body is defined as an opening 56, and two embedded nuts 57 are provided side by side on the upper and lower edges of the opening 56. As shown in FIG. 8, a bushing is provided on each of the upper and lower surfaces of the standing box body, and electrodes to be described later are provided therein.

The upper electrode bus bushing 58c is provided with a fixed electrode 58 inserted therein. As shown in FIG. 8, the upper portion of the fixed electrode 58 serves as a bus bar connection terminal 58a and the lower portion of the fixed blade electrode 58b. It is a fixed contact. A current transformer 59 is provided on the outer periphery of the bus-side bushing 58c projecting from the upper portion of the box, and further projects beyond the current transformer 59 to form the bus bar connection terminal 58a. It is configured to be connected to a bus-side terminal 53a disposed above C (FIG. 8 shows a state in which the bus-connecting terminal 58a and the bus-side terminal 53a are connected).

A movable electrode 60 is inserted into a through-hole in the lower part of the box, and as shown in FIG. 8, this movable electrode 60 is the side of the upper substantially L-shaped movable blade electrode 60a that is not a movable contact. A movable electrode rod 60b provided on the upper part of the movable electrode 60 is pivotally supported in the vicinity of the end of the movable electrode 60, and one end of the insulating rod 60c is pivoted to the end of the movable blade electrode 60a that is not a movable contact. The other end of the insulating rod 60c is pivotally supported at the other end of the drive lever 60d, one end of which is fixed to the interlocking shaft 61. The lower end portion of the movable electrode 60 protrudes into a housing 20 (described later) provided at the lower portion of the monopolar mold C through a through-hole at the lower portion of the box and is connected to a cable connection terminal 23a provided on the switch cable side bushing 23. Connected.

The housing 20 provided at the lower part of the monopolar mold C is provided with the switch cable side bushing 23 on the front surface, and the back surface is an opening, but is usually a rubber sealing cap 20a. And is sealed (see FIG. 15). In the housing 20, one end of the cable connection terminal 23a of the switch cable side bushing 23 is connected to the lower end portion of the protruding movable electrode 60 by a bolt 23b. Further, a voltage detection lead wire 24 extends from one end of the cable connection terminal 23a (see FIG. 15), and the other end of the lead wire 24 penetrates the sealing cap 20a, and between each single-pole mold C phase. Through the metal tube 24a which is fixed with a space between the lower back surface of the mechanism substrate 18 and the front surface side, the mechanism substrate 19 is led out (see FIG. 22).

As shown in FIG. 7, such single-pole molds C are arranged in three phases at intervals, and a grounded mechanism substrate 18 is provided in front of these single-pole molds C. The mechanism substrate 18 has a vertically long rectangular shape, and is provided with an opening 18e in which the drive lever 60d of each single-pole mold C protrudes and can be operated at the lower front portion of the mechanism board 18 so that the three front poles of each single-pole mold C can be operated. A single-phase packing 56a (see FIGS. 8 and 10) made of an insulating material is applied to the peripheral edge of the opening 56 to overlap the mechanism substrate 18 so as to close the opening 56. Then, the bolts 57a are inserted into the through holes provided in accordance with the positions of the embedded nuts 57 provided in the single-pole molds C and fastened to fix the single-pole molds C to the mechanism substrate 18.

The right and left end edges of the mechanism substrate 18 are bent at a substantially right angle to the front side at a predetermined length to provide bent edges 18a, and the lower end inclined parts are formed by notching the lower end corners on the front side of the left and right bent edges 18a. 18b is provided. As shown in FIG. 10, on the back side of each adjacent bent edge 18a, the front end edge of the partition wall 12 erected between the mold switches A comes into contact with each other via the packing 12a, and each mold switch A The gap between the bent edges 18a of the mechanism substrate 18 is closed. Further, protrusions 56b are provided between the packings 56a of the adjacent single-pole molds C to prevent play of the packing 56a of the mechanism substrate 18 and contact of the packings 56a between different phases. Along the lower edge of each mechanism substrate 18, the vertical piece 25b of the side L-shaped plate 25 faces downward and a part of the horizontal piece 25a is fixed by welding (see FIG. 8). The mechanism substrate 18 extends long upward, and has three through holes formed in the upper part thereof (see FIG. 7). The central through hole 18c is a long hole, and is formed of the mold switch A. At the time of attachment and removal, it serves as a guide for preventing overturning and serving as a guide. Finally, the mold switch A is fixed to the switch upper fixing square 11 with bolts and nuts using the left and right through holes 18d.

Further, as shown in FIG. 7, mountain-shaped bearings 62 are provided at the side edges of the three openings 18e of the mechanism substrate 18, and through holes are respectively formed in these bearings 62. The interlocking shaft 61 is rotatably supported on the shaft. A mechanism portion comprising such an interlocking shaft 61 and a mechanism for rotating the interlocking shaft 61 is provided on the mechanism substrate 18 (not shown), and these mechanism portions are provided on the mechanism substrate 18 via a packing 19a. 8 is covered with a box-shaped mechanism cover 19 shown in FIG. On the surface of the mechanism cover 19, indications "ON" and "OFF" for opening and closing are provided, and indicators indicating "ON" and "OFF" are provided in conjunction with the opening and closing of the mold switch A. (See FIG. 2).

The mechanism substrate 18 seals each mold switch A together with the mechanism cover 19, and further, in the space formed by the lower sealing cover 1, the side sealing cover 2, the upper sealing cover 3 and the back plate 54, the mechanism Each mold switch A is isolated by the substrate 18, the mechanism cover 19, the back plate 54, and each partition 12.

Next, a procedure for installing the mold switch A in the distribution box B will be described.
First, the open / close door in front of the distribution box B is opened, the back plate 54 is removed, and the installation of the mold switch A between the partition walls 12 shown in FIG. The lower ends of the lower end inclined portions 18b of the bent edges 18a of the mechanism substrate 18 of the mold switch A are placed on the temporary placement tables 16 of the two partition walls 12, respectively. In this state, the mold switch A is placed on the lower hermetic cover 1. At this time, the bolt 11a is passed through the through hole 18c in the upper center of the mechanism substrate 18 and temporarily fixed to the switch upper fixing square 11 (see FIG. 2). After that, two switch mounting brackets 17 are prepared. As shown in FIG. 15, the bolt through holes of the two switch mounting brackets 17 are brought into contact with the female screw portions provided in front of the left and right temporary mounting tables 16, respectively. The bolts 28 are respectively aligned with the bolt through holes of the switch mounting brackets 17 and screwed into the female screws of the temporary table 16, and the bolts 28 are tightened to advance the bolts 28 into the temporary table 16. .

As shown in FIG. 15, as the bolts 28 are advanced, the inclined convex portions 17a of the switch mounting bracket 17 are advanced, and the lower end inclined portions 18b of the bent edges 18a of the mechanism board 18 of the mold switch A are moved upward. As shown in FIG. 8, the entire mold switch A is lifted to a position where the screw hole on the upper surface of the bus connection terminal 58a of the mold switch A and the mounting hole on the lower surface of the bus terminal 53a are joined. Further, after aligning the positions of the through holes 18d in the upper part of the mechanism board 18 of each mold switch A and the through holes formed in the square member 11 for the upper part of the switch, bolts 11b are fitted into these through holes 18d and tightened with nuts. (See FIG. 2). After that, from the back of the distribution box B, the upper screw holes of the bus connection terminals 58a of the installed mold switch A and the mounting holes on the lower surface of the bus bar side terminal 53a are fastened and fixed with screws 53b. In this way, the mold switch A is installed in the distribution box B.

Thereafter, as shown in FIG. 15, the circular opening shown in FIGS. 12 to 14 is attached around the three-phase switch cable side bushing 23 provided in front of the housing 20 below the monopolar mold C. A horizontally long rectangular insulating rubber plate 21 is provided in which three portions 21a are provided side by side at equal intervals. A constant-length partition wall edge 21b is provided between the outer periphery of the insulating rubber plate 21 and the openings 21a. Furthermore, the insulating rubber plate 21 has a constant outer periphery on the upper surface, the lower surface, and the left and right side surfaces. A protruding edge 21c having a width is provided. Further, as shown in FIG. 15, a hood cover 22 is provided that can be joined and integrated with the outer periphery of the insulating rubber plate 21. The hood cover 22 has a metal deformed rectangular tube shape, and as shown in FIGS. 16 to 18, is a horizontally long rectangular shape with a protruding edge 22a having a constant width bent at a right angle along the front end of the upper surface 22d. Similarly, along the front end of the lower surface 22e, a fixed-width protruding edge 22b bent at a right angle is provided, and left and right side surfaces 22c of the upper surface 22d and the lower surface 22e are provided with substantially triangular side plates 22c, respectively, Is an open surface.

When the insulating rubber plate 21 and the hood cover 22 are attached around the bushing 23 on the switch cable side, the hood cover 22 is previously joined to the outer periphery of the insulating rubber plate 21 and shown in FIGS. Similarly, the inner peripheral edge of the opening surface of the hood cover 22 is locked to the protruding edge 21c of the insulating rubber plate 21, and the protruding edge 21c of the insulating rubber plate 21 is protruded outward from the outer peripheral edge of the rear end of the hood cover 22. Further, packings 22f are provided by being attached along both left and right edges of the upper surface 22d of the hood cover 22, respectively. The insulating rubber plate 21 thus configured and the hood cover 22 are sandwiched between the bulkhead 12 or the side sealing cover 2 and the outer ends of the three-phase switch cable side bushings 23 are respectively connected to the tips of the switch cable side bushings 23. Each insulating rubber plate 21 is covered with an annular gap so as to protrude from each opening 21a and between the outer periphery of each switch cable side bushing 23 and the inner periphery of each opening 21a.

Then, the protruding edge 22a of the hood cover 22 is brought into contact with the vertical piece 25b of the side L-shaped plate 25 provided at the lower end of the mechanism substrate 18, and two portions of the protruding edge 22a and the vertical piece 25b of the side L-shaped plate 25 are provided. The positions of the through-holes previously drilled are aligned, and screws 26 (see FIG. 23) are respectively screwed and fixed thereto, and the projecting edge 22b is brought into contact with the edge of the lower sealing cover 1 on the front side, The positions of the through-holes drilled in advance at the two positions of the projecting edge 22b and the edge of the lower sealing cover 1 are aligned, and screws 27 (see FIG. 23) are respectively screwed and fixed thereto.

At this time, as shown in FIG. 15 and FIG. 22 (the side L-shaped plate 25 and the packing 25c are displayed, the mechanism substrate 18 is removed for easy understanding), as shown in FIG. 18 A laterally long gap is provided between the horizontal piece 25a of the side L-shaped plate 25 on the lower back surface and the front end lower surface of the mold switch A, and the left and right ends of the side L-shaped plate 25 are the left and right partition walls 12 or side surfaces, respectively. A gap is provided so as not to interfere with the hermetic cover 2, and this gap continues to the inner part reaching the housing 20 below the monopolar mold C. In front of these gaps, laterally long side face L-shaped packings 25c provided along the bent portions of the side face L-shaped plate 25 are provided and closed, and both left and right ends of the upper surface 22d of the hood cover 22 and the partition 12 Alternatively, as shown in FIG. 15, the rear part of the gap between the side sealing covers 2 is closed by packing 22 f provided along the left and right end edges of the upper surface 22 d of the hood cover 22.

At this time, the horizontally long side L-shaped packing 25c protrudes from the left and right ends of the side L-shaped plate 25 by a predetermined length (see FIG. 22), and the lower ends of the side L-shaped packing 25c are bent and drooped. The corners on the back side of the hood cover 22 are cut to be inclined portions, and the corner portions on the front upper side of the packing 22f provided along both end edges of the upper surface 22d of the hood cover 22 are cut to form inclined portions, which are shown in FIG. As shown, it is provided in contact with the top and bottom.

Further, the gap between the left and right side surfaces 22c of the hood cover 22 and the partition walls 12 or the side surface sealing covers 2 is a protruding edge 21c on both sides of the insulating rubber plate 21 slightly protruding from the left and right side surfaces 22 of the hood cover 22. The gap between the lower surface 22e of the hood cover 22 and the lower sealing cover 1 is similarly closed by the lower protruding edge 21c of the insulating rubber plate 21.

In this way, the horizontally long gap between the horizontal piece 25a of the side face L-shaped plate 25 and the lower surface of the front end of the mold switch A is closed by providing the horizontally long side face L-shaped packing 25c. At both ends, the gap from the front side to the back side of the partition wall 12 or each side sealing cover 2 is closed by the packing 22f, the front end of the packing 22f is in contact with the packing 25c, and the rear end is the upper part of the insulating rubber plate 21 The both sides in the vertical direction are brought into contact with the projecting edge 21c, and the gap is closed by the projecting edges 21c on both sides of the insulating rubber plate 21, and the lower surface of the hood cover 22 is separated by the projecting edge 21c on the lower side of the insulating rubber plate 21. In the distribution box B, the outer periphery of the opening around the switch cable side bushing 23 at the lower part of the mold switch A is sealed.

Thereafter, when the T-type cable terminal 31 is inserted and attached to the switch-cable-side bushing 23, the insulating cylinders 31a protruding toward the switch-side at the tip of the T-type cable terminal 31 completely cover the switch-cable-side bushing 23. In addition, the outer periphery of each insulating cylinder 31a is fitted into the opening 21a of the insulating rubber plate 21, so that each switch cable side bushing 23 portion and its periphery are completely sealed and not exposed.

When repairing or replacing a plurality of mold switches A installed in the distribution box B, if there is a space on the back of the distribution box B, it is necessary to remove the back plate 54 of the distribution box B and repair or replace it. Repair or exchange is performed by releasing the connection with the bus 53 of a single mold switch A alone. Also, if there is no space on the back of the distribution box B, remove the ceiling plate of the distribution box B, remove the upper sealing cover 3, and release the connection to the bus bar 53 from above the distribution box B with the mold switch A alone. Repair or replace. In addition, regardless of whether there is space on the back of the distribution box B, a separate device is provided above the connection portion of the bus bar 53 in the space surrounded by the respective sealing covers 1, 2, 3 so that the mold can be opened and closed. If repair or the like cannot be performed from above the device A, the back plate 54 of the distribution box B is removed and repair or replacement is performed for each mold switch A.

With these configurations, the following effects can be obtained.
Since the conventional conductive portion is incorporated in a mold switch integrated with a plurality of circuits or an inner box integrated with a plurality of circuits in an airtight state, if a failure occurs even in one circuit or one phase, it is replaced for each distribution box. However, in this embodiment, it is possible to replace each circuit on-site only by making the bus 53 non-charged, and partial repair and replacement including replacement of sensors for IT and the like are facilitated. At the beginning of the installation of this mold switch and the distribution box equipped with the mold switch mounting structure, do not attach the mold switch to unnecessary circuits, close the partition wall with a protective plate to ensure airtightness, and The initial cost can be reduced by covering the protective cover. In addition, in the distribution box, a through circuit, a manual switch, a switch with an SOG function, an automatic switch, and the like can be installed in combination. When the protection method changes after the mold switch is installed, and a frequent switch, high-speed switch, breaker, etc. are required for a circuit, renewal for each circuit can be done by matching the mounting dimensions such as mounting holes and bus bar connection positions. Is possible. Since each mold switch is hermetically sealed with a hermetic cover, it is possible to prevent dust, drip proofing, and entry of small animals (such as cockroaches and pupae) into the gaps between the phases. Since there is no cumulative fouling along the insulation resin mold insulation surface, it can be installed in heavy fouling areas.

In the case of a conventional multi-circuit integrated inner box structure switch, when an internal short circuit accident occurs in one circuit, it shifts to a butt charging electrode of a different system that is adjacent and open, increasing the short circuit capacity, The outbreak of power outages was expanding. In addition, in order to make it possible to replace the cable side by side in front of multiple mold switches, a certain gap is required between the circuits to fix the lower part of the mold switch. For this reason, a larger width than that of the same number of circuits integrated in a single circuit is necessary, so it cannot be realized in an area where there are dimensional restrictions. However, in this embodiment, even if the structure of the mold switch can be replaced by a single circuit, each circuit can be made the same as the conventional one with five circuits. Can be the same.

Furthermore, compared to the conventional mechanism board and mechanism cover, the mechanism board is greatly extended upward so as to cover the connection part of the bus, and the left and right edges of the mechanism board are bent to the front side to provide a bent edge. Can suppress the influence on other adjacent mold switches, and the bent edges on the left and right of the mechanism board that extend greatly upward can act as cooling fins and suppress the temperature rise in the mold switch. .

In the conventional mold switch, even if the contact is sealed, a part of the switch cable side bushing is exposed in the distribution box, so in a humid atmosphere, the moisture absorption in the switch cable side bushing For this reason, there was a risk of deterioration of insulation and shortening the original life. In addition, the cable ground wire is removed and the bushing has an insulation creepage surface for disconnecting it from the ground when diagnosing deterioration of the water bird lump line. However, if insulation failure occurs due to contamination, there is no space between the phases and the circuit. Had to dismantle the cable terminal. However, in this embodiment, the switch cable side bushing is sealed in the distribution box so that even a part of the bush is not exposed, so that moisture absorption of the resin can be suppressed even in a humid atmosphere. Prolongs life. Even in heavily polluted areas, it is possible to ensure long-term insulation characteristics along the ground insulation surface at the time of water bird lump line diagnosis. Since a continuous fixed-length partition wall edge is provided between the outer periphery of the insulating rubber plate and each opening, it is possible to extend the insulation creepage distance between the different phases and the ground in this insulating rubber, and further increase the anti-fouling strength. I can do it.

In addition, in the said Example, although specifically described as the monopolar mold A, the structure of the monopolar mold A is not limited to this. Further, as a method of attaching the side sealing cover 2 and the partition wall 12 to the lower sealing cover 1 and the upper sealing cover 3, bolts 13 and nuts 4, 7, 14 are provided on the bottom and top surfaces of the side sealing cover 2 and the partition 12 by welding, The lower sealing cover 1 and the like are attached to these by screwing bolts and nuts, but the method of attaching the side sealing cover 2 and the partition wall 12 to the lower sealing cover 1 and the upper sealing cover 3 is limited to these methods. is not. Further, five mold switches A are installed in the distribution box B, but the scale of the distribution box B and the number of mold switches A are not limited to these. Further, the hood cover 22 is not limited to metal, and the upper and lower projecting edges 22a and 22b are screwed to the vertical piece 25b of the side L-shaped plate and the lower sealing cover 1 for mounting. The method of attaching the hood cover 22 is not limited to this.

Further, as a packing to be attached to the outer periphery of the hood cover 22, a packing 25 c is provided in a gap between the horizontal piece 25 a of the side L-shaped plate 25 and the lower surface of the mold switch A, and on both edges of the upper surface 22 d of the hood cover 22. Although the packing 22f provided along is provided, the packing provided on the outer periphery of the hood cover 22 in the distribution box B to seal the periphery of the switch cable side bushing 23 is not limited to these. Absent.

It is a partial cross section side view of the state which attached the mold switch in the distribution box of the Example of this invention. It is a front view of the state which attached the mold switch in the distribution box of the Example of this invention, and removed the door. It is the perspective view which fractured | ruptured the part which each shows the frame in the distribution box of the Example of this invention, an upper sealing cover, a side sealing cover, a lower sealing cover, and a partition. It is front explanatory drawing of the state which fixed the side sealing cover in the distribution box of the Example of this invention to the upper sealing cover and the lower sealing cover, respectively. It is front explanatory drawing of the state which fixed the partition in the distribution box of the Example of this invention to the lower sealing cover. It is side explanatory drawing which shows the arrangement | positioning relationship between the lower sealing cover, the backplate, and packing in the distribution box of the Example of this invention. It is a perspective view of the state which attached the mechanism board | substrate to the mold switch of the Example of this invention. It is a partial cross section side view of the state which attached the mechanism board | substrate and the mechanism cover to the monopolar mold of the Example of this invention. It is a perspective view of the monopolar mold of the Example of this invention. It is a partial top view of the state which installed the mold switch of the Example of this invention between two partition walls and the side sealing cover. It is a partial front view of the state which attached the mechanism cover and T type | mold cable terminal which cover the front of the mold switch of the Example of this invention. It is a front view of the insulating rubber plate of the Example of this invention. It is a side view of the insulating rubber plate of the Example of this invention. It is a top view of the insulating rubber plate of the Example of this invention. It is a partial cross section side view which shows the part of the housing of the monopolar mold lower part in the state which installed the mold switch of the Example of this invention between two partition walls. It is a front view of the metal food cover of the Example of this invention. It is a side view of the metal hood cover of the Example of this invention. It is a top view of the metal hood cover of the Example of this invention. It is a front view of the state which attached the insulating rubber plate and packing to the hood cover of the Example of this invention. It is a side view of the state which attached the insulating rubber plate and packing to the hood cover of the Example of this invention. It is a top view of the state which attached the insulating rubber plate and packing to the hood cover of the Example of this invention. FIG. 3 is a partial front view of the embodiment of the present invention in which a mold switch is installed between the left and right partition walls on the lower sealing cover, and the mechanism substrate, the insulating rubber plate, and the hood cover are not attached. In the embodiment of the present invention, a mold switch is installed between the left and right partition walls on the lower hermetic cover, the mechanism board, the insulating rubber plate and the hood cover are attached, and a part of the front surface without the T-type cable terminal attached FIG. It is a front view of the switch attachment bracket of the Example of this invention. It is a top view of the switch mounting bracket of the Example of this invention. It is a side view of the switch attachment bracket of the Example of this invention. It is a side view of the state which inserted the upper end part provided in the substantially trapezoid shape of the partition of the Example of this invention in the guide metal fitting. It is a top view of the state which inserted the upper end part provided in the substantially trapezoid shape of the partition of the Example of this invention in the guide metal fitting. It is sectional drawing which shows the state which has sealed the inside of the space formed of the upper sealing cover, the lower sealing cover, the side sealing cover, and the backplate in the distribution box of the Example of this invention.

Explanation of symbols

A Mold switch B Distribution box C Monopolar mold 1 Lower sealing cover 2 Side sealing cover 3 Upper sealing cover 12 Bulkhead 16 Temporary table 17 Switch mounting bracket 18 Mechanism substrate 18a Bent edge 18b Lower end inclined part 19 Mechanism cover 20 Housing 21 Insulating rubber plate 22 Hood cover 22f Packing provided on both edges of the upper surface of the hood cover 23 Switch cable side bushing 25 Side L-shaped plate 25c Packing of approximately L shape 31 T-type cable terminal
31a Insulation tube on the switch side of a T-type cable terminal

Claims (3)

A front-side opening for a single-pole mold that has three buses, with a bus-connecting terminal at the top, a cable-connecting terminal at the bottom, and three single-pole molds with open / close contacts inside. A mechanism board is provided in contact with the front surface of each of the three-phase single-pole molds so as to close the part, and a mechanism part is provided on the mechanism board so that the switching contacts of each phase move integrally. In a distribution box where multiple air mold switches with mechanism covers are installed in parallel,
On the channel base at the bottom of the distribution box, provide a frame that is formed in a box shape by extending the frame vertically and horizontally, and passes the plate horizontally to a certain height on both sides of the frame to cover the lower sealing cover. The plate body is erected at both the left and right ends on the lower sealing cover to provide side sealing covers, and the upper sealing cover is provided by horizontally passing the plate body on top of each side sealing cover. On the top, metal partition walls are erected so as to be located between the respective air mold switches installed and separated from the side surfaces of the air mold switches. The rear end face of each cover, each side sealing cover, and each partition wall is brought into contact with the rear plate of the distribution box, and each air mold is placed above the space formed by the upper sealing cover, the lower sealing cover, and the side sealing cover. Branch switch The phases of the bus to be sintered is arranged,
The air mold switch is installed between the side sealing covers on the upper surface of the lower sealing cover and the partition walls, the air mold switches and the buses are connected, and the lower front of the monopolar mold A switch cable side bushing having a cable connection terminal is provided, a terminal of a rising cable is connected to each of these cable connection terminals, and the terminal of these rising cable covers each switch cable side bushing,
Provided in front of each of the plurality of air mold switches installed is a mechanism board extending a certain length upward beyond the opening of each monopolar mold, and the shape and size of the mechanism board on each mechanism board. A mechanism cover corresponding to each of the above is provided, the inside of each air mold switch is sealed by each mechanism board and each mechanism cover, and the switch side cable bushing of each of the three phases is protruded downward from the mechanism board. , Providing a sealing member that closes the gap between the lower sealing cover and the side sealing cover or partition wall around the bushing on the side of the switch cable, the back plate of the distribution box, the upper sealing cover, the lower sealing cover, each side sealing cover, Sealing the space formed by each mechanism board with a mechanism cover and the sealing member,
When repairing or replacing the air mold switch installed in the distribution box, remove the back plate of the distribution box, or remove the ceiling plate of the distribution box, remove the upper sealing cover, and remove each air mold. A structure for mounting an airborne mold switch in a distribution box, wherein the switch can be repaired or replaced by releasing the connection to the bus with a single switch. The left and right edges of each mechanism board of each air mold switch are bent at a substantially right angle to the front side to provide a bent edge, and the lower end corner on the front side of each bent edge is cut out. Provided as a lower end inclined part,
In each lower part of each partition wall and each side sealing cover, a square bar-like temporary table is horizontally provided so as to protrude from the front, and a female screw is provided at the approximate center of the front surface of each temporary table. Both sides of the upper surface protrude to both sides of the partition wall or side sealing cover,
Separately, a tongue piece having a bolt through hole is provided at the front part, and a substantially wedge-shaped switch mounting bracket having a tapered convex part at the rear part is provided,
When the air mold switch is installed between the side sealing cover and the partition wall, or between each partition wall, the air mold switch is placed on each of the left and right partition walls or the side sealing cover on the lower sealing cover. The air mold switch was placed on the lower hermetic cover by placing the lower slopes of the bent edges on both sides of the mechanism board, and the bolt through hole of the switch mounting bracket was provided in front of the temporary table. Abutting on the female thread part, tightening the bolt through the bolt through hole of the switch mounting bracket and advancing the bolt into the female screw of the temporary mounting base, and with the progress of the bolt, the inclined projection of the switch mounting bracket And the lower end inclined part of each bent edge of the mechanism board of the above-mentioned air mold switch is raised upward, and the bus connection terminal and the bus-side terminal of the air mold switch are joined. 2. The distribution of the air mold switch according to claim 1, wherein the mechanism substrate is fixed to the frame of the frame body with bolts and nuts in a state where the air mold switch is entirely lifted up to a position. Mounting structure in the box. The sealing member for sealing the periphery of the bushing on the side of the switch cable is provided with a protruding edge having a constant width on the outer periphery of a substantially rectangular insulating rubber plate, and has three circular openings side by side at substantially equal intervals on the insulating rubber plate. Provide a deformed square tube-shaped hood cover that can be joined and integrated to the outer periphery of the insulating rubber plate, covering the outer periphery of the insulating rubber plate to the side of the protruding edge,
The insulating rubber plate integrated with the hood cover is projected on the switch cable side bushing, the switch cable side bushing is projected from each opening of the insulating rubber plate, and the outer periphery of the switch cable side bushing and the insulation An annular gap is provided between each opening of the rubber plate, and the upper portion of the hood cover is fixed to a side L-shaped plate provided along the lower edge of the mechanism substrate. Is fixed to the lower hermetic cover, and the outer periphery of each insulation tube protruding to the switch side of the T-type cable end is plugged into each opening of the insulating rubber plate without any gaps. With bushings,
Due to the protruding edge of the insulating rubber plate protruding from the outer periphery of the hood cover by a certain width, the gap between the back surface of the hood cover and the partition wall or the side sealing cover, and between the bottom surface of the hood cover back and the lower sealing cover Each of the gaps,
The gap between the left and right ends of the upper surface of the hood cover and the partition wall or the side sealing cover is closed by packing provided along both edges of the upper surface of the hood cover,
The gap between the side L-shaped plate provided along the lower edge of the mechanism substrate on the lower back surface of the mechanism substrate and the front end lower surface of the mold switch, and between the left and right ends of the side L-shaped plate and the partition wall or the side sealing cover The mounting structure for a distribution box of an air mold switch according to any one of claims 1 and 2, wherein the gaps are each closed by a substantially L-shaped packing.

Images