JPH03806Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a low-pressure draw-in box that has been improved in order to make the mounting column more compact and improve its aesthetic appearance.

Conventional low-voltage branch boxes have been designed in various ways to improve the appearance of the poles and to make them more compact. When arranging in-phase, the wiring when branching becomes complicated, etc.
The current situation is that we cannot get what we want.

This idea was made in consideration of these points, and the fuse holders and branch terminals in the lead-in box were arranged for each circuit, and each circuit was placed back to back to make the entire box as small as possible, and each circuit was The object of the present invention is to provide a low-pressure lead-in box that has a fuse holder and branch terminals facing openings with opening and closing doors on both sides of the box to improve workability during repairs.

An embodiment of this invention will be described below with reference to the drawings. 1 is a draw-in box main body, 2 is an opening/closing door that covers the openings bored on both sides of the draw-in box main body 1, and 3,
4, 5, and 6 are U-phase, V-phase, and W-phase, respectively, which stand vertically in parallel with each other at intervals in the draw box main body 1.
The upper ends of these vertical bus bars 3, 4, 5, and 6 form horizontally bent terminal blocks 3a, 4a, 5a, and 6a, respectively. Further, compression connectors 7, 8, 9, and 10 are connected to the lower ends of each of these vertical bus bars 3, 4, 5, and 6, respectively, for compressively connecting the incoming cable and the outgoing cable. Reference numerals 11, 12, 13, and 14 indicate U-phase, V-phase, W-phase, and N-phase horizontal busbars that are arranged horizontally from top to bottom at regular intervals on the inside of the front plate 1a of the main body 1 of the pull-in box. There are two sets, top and bottom. In addition, each of these horizontal busbars 11, 12,
13 and 14 are bent parts 1 each having both ends bent into a key shape.
1a, 12a, 13a, and 14a. 1
5, 16, 17, 18 are vertical busbars 3 of the same phase, respectively.
and the horizontal busbar 11, the vertical busbar 4 and the horizontal busbar 14, the vertical busbar 5 and the horizontal busbar 12, and the vertical busbar 6 and the horizontal busbar 13.
6, 17, and 18 are provided in two sets, upper and lower. 19
20 is each fuse holder connected to the bent portions 11a, 12a, 13a at both ends of each horizontal bus bar 11, 12, 13, and 20 is each connected to the bent portion 14a end at both ends of each horizontal bus bar 14. Short circuit bus bar, 21 is each of these fuse holders 19
Or each branch terminal electrically connected to one end of the short circuit busbar 20, and the horizontal busbar 1 of each phase
1, 12, 13, 14 and each fuse holder 19
Alternatively, the shorting bus bar 20 and the branch terminal 21 form a U-shape, and each fuse holder 19 or the shorting bus bar 20 and each branch terminal 21 face the openings on both sides of the lead-in box body 1. 22 is the adjacent fuse holder 19 or short circuit busbar 20 of each phase.
and a branch terminal barrier that shields the branch terminal 21;
23 is each cable insertion hole provided in the bottom plate 1b of the drop-in box body 1 below each of the compression connectors 7, 8, 9, and 10, and 24 is a large number of branch line bushings provided on the outer surface of the rear side plate 1c of the drop-in box body 1. Each of these branch line bushings 24 is provided at each hole bored in the rear side plate 1c in correspondence with each of the branch terminals 21. Reference numeral 25 denotes a large number of support holders for holding each branch line end introduced into the lead-in box main body 1 from the branch line bushing 24, and each of these support holders 25
The core wire at each branch wire end supported by the above branch terminal 2
1. Reference numerals 26 and 27 are upper and lower mounting brackets provided on the upper and lower sides of the rear side plate 1c of the draw-in box body 1, respectively. 28 is each terminal block 3 above.
Bypass terminals 29 for connecting bypass wires provided on the bypass terminals a, 4a, 5a, and 6a are provided at the periphery of an opening 30 formed in the top plate 1d of the lead-in box body 1 located above each of these bypass terminals 28. , are cylindrical bodies that protrude from the upper surface of the top plate 1d, and the upper ends of the bypass terminals 28 protrude into each of these cylindrical bodies 29. Reference numeral 31 denotes a fixing base provided approximately at the center of the upper surface of the top plate 1d, and this fixing base 31 is higher than each of the cylinders 29. 32 is a bottomless box-shaped lid body, and this lid body 3
2 is placed on the top plate 1d of the draw-in box main body 1 and covers each of the cylinders 29 mentioned above. 33 is a notch for ventilation provided at the center lower edge of each side of this lid 32, and 34 is a fixing screw that passes through the approximate center of this lid 32 to attach the lid 32 to the top plate 1d of the drawer box body 1. When mounted, it can be screwed into the screw hole provided in the fixing base 31.

In this low pressure lead-in box, horizontal busbars 11, 12, 13, 14 of each phase are arranged in order from top to bottom,
Each of these horizontal busbars 11, 12, 13, 14
The fuse holder 19 or the shorting bus bar 20 and the branch terminal 21 are provided on the extension line, and these are formed into a U-shape. 3, 4, 5,
6 is installed upright, space can be used effectively and the box body 1 can be made extremely small. Furthermore, if the fuse holder 19 and the like are configured as described above, they can be arranged together for each circuit, and in the above embodiment, the box body 1
The upper and lower two stages on both sides constitute four circuits. Since the branch lines of each circuit are led out from the rear plate 1c of the box body 1, each circuit can be wired together in the branch direction. Therefore, the wiring of the branch line is not complicated and is aesthetically pleasing, and furthermore, during connection work, incorrect connections are eliminated and workability is good. Furthermore, since each fuse holder 19, branch terminal 21, etc. are located facing the openings on both sides of the box body 1, when performing maintenance, inspection, or repair, an operator can immediately inspect by opening the opening/closing door 2. It is easy to do.

As described above, this invention allows a large number of circuits to be branched into individual circuits in a low-voltage lead-in box, and moreover, these circuit devices can be housed extremely compactly. Moreover, since each fuse holder faces an opening with an opening/closing door, it has the advantage of being easy to maintain and inspect.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of this invention, Fig. 2 is a partially sectional rear view of the same, Fig. 3 is a partially sectional plan view of the same,
FIG. 4 is a plan view of the same, and FIG. 5 is an explanatory diagram of the structure of the bus bar in the main body of the draw-in box of this invention. In the figure, 1 is the main body of the draw-in box, 2 is the opening/closing door, 3,
4, 5, 6 are vertical bus bars, 11, 12, 13, 1
4 is a horizontal bus bar, 15, 16, 17, and 18 are connection bus bars, 19 is a fuse holder, 20 is a short circuit bus bar, 21 is a branch terminal, 23 is a cable insertion hole, 24 is a branch wire bushing, and 32 is a lid body.

Claims (1)

[Scope of utility model registration request] The cables of each phase drawn into the box body and the vertical busbars of each phase connected to each other are set up at intervals, and the cables of each phase connected to the cables drawn into the box body are set up at intervals, and each cable is connected to each other from top to bottom at intervals along the inside of the front panel of the box body. One or more sets of horizontal busbars of the same phase are provided, the vertical busbars and horizontal busbars of the same phase are connected by connecting busbars, and both ends of each horizontal busbar are bent into a key shape, at each bent end. A fuse holder or a short-circuit busbar and a branch terminal following this are connected to the openings on both sides of the box body, and the branch wires connected to each branch terminal are led out from the rear side plate of the box body, and the openings are A low-pressure draw-in box characterized by having an opening/closing door.