JPH09271108A - Single-phase three wire system of distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the switching of connection merely with loosening and fastening one screw by arranging a first L-phase switch screw hole face, an N-phase switch screw hole face, and a second L-phase switch screw hole face on roughly the same plane, and paralleling the longitudinal directions of the slots of the connection bars of voltage switches with each other. SOLUTION: To switch the connection of the voltage of a breaker, a switch screw 7 is to be loosened to such an extent that the tip of a screw part 702 comes off a switch screw hole face 202. At that time, the screw 7 is pressed to the U-shaped connection of a conductor by an elastic retainer, so it never easily comes off a switch piece. Moreover, for the switch piece, too, the engaging groove 8022 of the retaining piece 802 engages with a slot face part 600, so it never slips out of the connection bar 6. In that condition, the screw 7 and the switch piece can shift in a sliding manner within the slot 602, so the voltage is switched by picking up the head 701 of the screw 7 between fingers, and shifting it to side of the second L-phase switch screw hole face part 303, the switch piece and all, and fastening the screw 7 over again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-phase three-wire type distribution board having a voltage switching device for a branch breaker.

[0002]

2. Description of the Related Art Conventionally, voltage switching devices for a distribution board of this type have been disclosed in, for example, JP-B-48-14582 (hereinafter referred to as A system) and JP-A-60-34708 (hereinafter referred to as B system).
, Kaikaihei 5-84108 (hereinafter referred to as C method),
There is one such as that shown in Japanese Utility Model Laid-Open No. 56-96813 (hereinafter referred to as D system), and in each case, a bar and screw for exclusive use of voltage switching are separately attached, and the bar is already attached at the time of connection change work. It is designed so that you can use the same bars and screws that are already installed and change only the position and replace them without having to replace them with screws or screws.

[0003]

However, such an apparatus has the following inconveniences.

First, in the methods A and B, it takes time to completely remove the switching screw from the connection changing device and replace it with another screw hole, and at the same time, the removed screw is dropped and lost during work. There was a thing. In that respect, the method of C can work without removing the screws, but in any method, if the terminal screw of the breaker is also included, it is necessary to loosen the two screws and retighten, and the switching work took time. .

Further, in the method D, only one screw is required to be loosened, and it seems that the workability is good. However, during the switching work, the tubular metal fitting and the screw are disjointed, which rather deteriorates the workability. There were inconveniences such as the bar shape and arrangement becoming complicated.

[0006]

SUMMARY OF THE INVENTION Therefore, according to the invention of the present invention, firstly, the operation of loosening or tightening the screw required for connection replacement requires only one screw, secondly, the shape and arrangement of the bar are simple, and thirdly, Single phase with a branch breaker voltage switching device that does not loosen the fittings and screws during connection change and has good workability, and can be performed without completely removing the screws from the device, so that the screws are not lost The purpose is to provide a three-wire distribution board.

[0007]

[Means and Actions for Achieving the Object] In order to achieve the above-mentioned object, in the invention of the present application, first, a single-phase three-wire type electric line consisting of a first L-phase, an N-phase and a second L-phase is provided. A two-pole breaker is provided, and a plurality of voltage switching devices for changing the supply voltage to the breaker are provided by selectively connecting the N-phase or the other L-phase to the terminal of the pole on one side of the breaker. In the distribution board in which the branch breakers are individually connected to the voltage switching device, the configuration of the portion in which the N phase or the other L phase is selectively connected to the terminal of the other pole of the breaker is the other L phase. Is the second L phase, the N phase switching screw hole surface portion including the screw hole provided in the bus bar of the N phase and the second L phase switching including the screw hole provided in the second L phase The screw hole surface part, the foot part connected to the breaker terminal, and the long hole surface part having the long hole The connection bar, the oblong hole surface portion of the connection bar, the switching piece interposed between the N-phase switching screw hole surface portion or the second L-phase switching screw hole surface portion, and slidingly moving in the oblong hole of the connection bar, the head Section and the N-phase switching screw hole portion or the second L-phase switching screw hole surface portion, and a switching screw for stacking and screwing the elongated hole surface portion of the connection bar and the switching piece, and the head side of the switching screw. Is the operation handle side of the breaker, and when the other L phase is the first L phase, the first switching screw hole surface portion is the first switching screw hole surface portion instead of the second L phase switching screw hole surface portion. The first L-phase switching screw hole surface portion, the N-phase switching screw hole surface portion, and the second L-phase switching screw hole surface portion are arranged in substantially the same plane. The direction of the long axis of the long hole of the connection bar of each voltage switching device is arranged in parallel. The number of screws to be loosened or tightened in the operation of switching the voltage is only one, and the first L-phase switching screw hole surface portion, the N-phase switching screw hole surface portion and the second L-phase switching screw hole surface portion are substantially the same. Since they are arranged in the plane and the long holes of the connection bars of each voltage switching device are arranged parallel to each other in the long axis direction, the shape and arrangement of the bars are simple.

Next, the switching piece is provided with a bent or tubular conductor piece and an engagement claw that surrounds and holds the conductor piece and is slidably engaged in the long axis direction of the elongated hole of the connection bar. In addition, the threaded portion of the switching screw penetrates substantially the center of the conductor piece, so that the switching piece does not come apart from the connection bar during the switching operation, which improves workability.

Further, the holding piece is provided with an elastic holding portion of the thread portion of the switching screw. This prevents the screw from coming off the switching device during the switching work, and prevents the screw from being lost.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

In FIG. 1, 1 is a first L-phase copper bus bar, 2 is an N-pole copper bus bar, and 3 is a second L-phase copper bus bar, each of which is supplied with power from a single-phase three-wire type electric circuit. ing. Reference numeral 4 is a branch breaker that receives power supply from a copper bus bar, 401 is a terminal of a breaker that is fixedly connected to the first L phase, and 402 is a terminal that is selectively connected to the N phase or the second L phase. Is. Reference numeral 5 is a branch breaker similarly supplied with power from a copper bus bar, 501 is a terminal fixedly connected to the second L phase, and 502 is a terminal selectively connected to the N phase or the first L phase. is there.

Reference numeral 6 is a connection bar, 7 is a switching screw, and 8 is a switching piece, and a plurality of switching bars are provided corresponding to the number of branch breakers.

FIG. 2 is an exploded perspective view of parts of the voltage switching device connected to the branch breaker 4 in FIG. In FIG. 2, reference numeral 202 denotes an N-phase switching screw hole surface portion including the screw hole 201, and a plurality of N-phase bus bars 2 are provided at necessary positions. 30
Reference numeral 3 denotes a second switching screw hole surface portion including the screw hole 302, which is formed from the second L-phase bus bar 3 through the rising portion 304. A foot portion 301 is fixedly connected to the terminal 501 of the branch breaker 5 and extends from the second L-phase switching screw hole surface portion 303 in this example, but may stand up from the bus bar 3.

Reference numeral 101 denotes a foot portion extending from the first L-phase switching screw hole surface portion 103, similarly to 301, which is fixedly connected to the terminal 401 of the branch breaker 4. Of course, it does not matter if you stand up above Busbar 1.

Reference numeral 601 denotes a foot portion which is connected to the terminal 402 of the branch breaker 4, and constitutes the connection bar 6 integrally with the long hole surface portion 603 having the long hole 602. Reference numeral 801 denotes a U-shaped conductor piece, which includes a holding portion 8021 for incorporating and surrounding the conductor piece 801 and the elongated hole surface portion 6 of the connection bar 6.
A switching piece is constituted by 03 and a holding piece 802 having engaging claws 8022 that are slidably engaged from both sides in the long axis direction of the long hole 602.

Reference numeral 7 is a switching screw composed of a head 701 and a screw portion 702. The switching screw 7 is a handle 40 of the branch breaker 4.
After passing through the long hole 602 from the operation side of No. 3, the conductor piece 801 is inserted into the holding piece 802, that is, the switching piece, and the inside of the long hole 602 is moved to move to the screw hole 201 of the N-phase bus bar 2.
Alternatively, it is selectively screwed into any of the screw holes 302 of the second L-phase bus bar 3. That is, switching screw 7
Is slidably moved in the elongated hole 602 of the connection bar 6, and is inserted between the head 701 and the N-phase screw hole surface portion 202 or the second L-phase screw hole surface portion 303 to form the elongated hole surface portion of the connection bar 6. A switching piece composed of 603, a conductor piece 801, and a holding piece 802 is stacked and screwed.

In FIG. 3, the switching screw 7 is an N-phase switching screw hole 20.
The cross-sectional state when screwed to 1 is described. X in Figure 3
In the −X cross section, the engaging claws 8022 of the holding piece 802 are engaged by holding the long hole surface portions from both sides, and the conductor piece 801 is held in the holding portion 8021 and the long hole surface portion 602 and the N-phase switching screw hole surface portion 20.
The state is held between two. The holding piece 80
No. 2 has a dimensional relationship such that when the switching screw 7 is tightened, the conductor piece 801 contacts the oblong hole surface portion 602 of the connection bar 6 and the N-phase switching screw hole surface portion 202.

In the YY cross section of FIG. 3, a cross section in a direction orthogonal to the previous XX cross section and the switching screw hole surface portions 103, 20.
2, 303 shows the positional relationship. In the YY cross section of FIG. 3, the long hole surface portion 603 of the connection bar 6 and the switching screw hole surface portions 103, 202, 303 have a substantially equal positional relationship with each other.
3, 202 and 303 are arranged substantially in the same plane, and if the switching screw 7 is loosened and the tip is removed from the screw hole 201, the screw 7 remains penetrating the elongated hole 602 and the screw portion 7
02 is inserted in the conductor piece 801, and the screw 7 and
The switching piece including the conductor piece 801 and the holding piece 802 is slidably moved in the elongated hole 602 from the N-phase switching screw hole surface portion 202 side to the second L-phase switching screw hole surface portion 303 side. , The screw portion 702 of the screw 7 can be tightened in the screw hole 302.

In the above description, as shown in FIG.
The conductor piece 801 is provided with a step portion 8011 and a contact portion 8012, and the holding piece 802 is provided with a step portion 8023 corresponding to the step portion 8011. The screw 7 is screwed to the switching screw surface portions 202 and 303. The conductor piece 801 is configured so as not to fall off from the holding piece 802 even if it is not provided, and the holding piece 802 has an elastic holding piece at a portion located in the opening 8013 of the U-shaped conductor piece 801. 8024 is provided. The elastic holding piece 8024 functions to press the threaded portion 702 against the U-shaped connecting portion 8014 of the conductor piece 801 in a state where the threaded portion 702 is surrounded by the conductor piece 801, and thereby the tip of the threaded portion 702. The screw 7 does not easily fall out of the switching piece even if it is removed from the switching screw holes 201 and 302.

In FIG. 1, the voltage switching device on the side of the branch breaker 5 includes a second L-phase foot portion 301 fixedly connected to the terminal 501, a connection bar 6'connected to the terminal 502, and a switching screw 7 '. , The switching piece 8 ′, the switching screw hole surface portion 202 ′, the first switching screw hole surface portion 103 ′, and the like have the same basic configuration as the voltage switching device on the side of the branch breaker 4, and the voltage switching of the branch breakers 4 and 5 is performed. The individual parts of the device are arranged symmetrically with respect to the N-phase busbars, respectively, and
2'is arranged so that the long axis directions of the holes are parallel to each other.

A voltage switching operation method of the voltage switching device shown in FIG. 1 will be described below.

In the branch breaker 4 of FIG. 1, the terminal 401 is fixedly connected to the first L phase of the single-phase three-wire type electric circuit in the state shown in the figure, and the terminal 402 is connected via the connection bar 6 and the switching piece 8. N
Since it is connected to the busbar 2 of the phase, it is connected to 100V.

The voltage of the breaker 4 is 100V to 200V
To change the connection to, first change the switching screw 7 to the screw portion 702.
Loosen the tip of the so that it comes off the switching screw hole surface portion 202. At this time, the screw 7 is pressed against the U-shaped connecting portion 8014 of the conductor piece by the elastic holding portion 8024 in FIG. 4, so that the screw 7 does not easily come off from the switching piece 8. Switching piece 8
Also, since the engaging claws 8022 of the holding piece 802 are engaged with the long hole surface portion 603, even if the screw 7 completely comes off from the switching piece 8, it does not come off from the connection bar 6.
In this state, the screw 7 and the switching piece 8 can be slidably moved in the elongated hole 602. Therefore, the head 701 of the screw 7 is pinched with a finger to move the switching piece 8 to the second L-phase switching screw hole surface portion 303 side. If the terminal 401 is connected to the first L phase and the terminal 402 is connected to the second L phase by moving and screwing the screw 7 again, the breaker 4 becomes 200V. FIG. 5 is a diagram at the end of work when the breaker 4 is switched to 200V.

In the above work, only one screw needs to be refastened to change the connection, so the workability is that of the conventional method A,
Needless to say, it is better than B and C. Further, in the conventional methods A, B, and C, for example, when a voltage switching device for the breaker 4 is desired, the second L-phase switching screw hole portion extends over the N-phase bus bar and extends to the first L-phase bus bar side. However, in the voltage switching device according to the present invention, the connecting bar 6 in FIG. 1 extends from the terminal 402 of the breaker 4 to the bus bar 2 of N phase. The structure extends to the second L-phase bus bar 3 on the breaker 5 side, and the shape of the L-phase bus bar is simplified, and the yield of the material is improved. Further, compared to the method C, the connecting bars having elongated holes do not have to be arranged in a vertically converging manner, and since the connecting bars are aligned parallel to the long axis direction of the elongated holes, it is very neat and simple to handle a plurality of voltages. The switching devices can be aligned and arranged.

Further, the switching piece 8 slides while being engaged with the oblong hole surface portion of the connection bar 6 by the engaging claws 8022 of the holding piece 802, and the screw 7 is elastically held in the switching piece by the elastic holding piece 8024. Since it is held by, the switching piece and the switching screw do not fall off during the switching work and are not lost, so the workability is further improved.

FIG. 6 shows a configuration in which the present invention is applied to all branch breakers of a distribution board. FIG. 7 shows an embodiment in which the voltage switching device according to the present invention is applied to a single-phase three-wire type distribution board in which branch breakers are arranged in a line.

[0028]

As described above, according to the present invention, according to claim 1, the structure of the bus bar including the voltage switching device is simple, and the voltage switching work can be performed by loosening or tightening one screw. We can provide a simple single-phase three-wire distribution board.
Further, according to claim 2, the switching metal fittings do not come apart from the device during switching work, and according to claim 3, work can be performed without completely removing the switching screw from the device, and workability without losing parts such as screws. It is possible to provide a single-phase three-wire type distribution board having a good voltage switching device.

[Brief description of drawings]

FIG. 1 is a diagram of an embodiment of claim 1 of a single-phase three-wire type distribution board of the present invention.

2 is an exploded perspective view of the component structure of the embodiment of FIG.

FIG. 3 is a sectional view of the embodiment of FIG.

FIG. 4 is a detailed shape explanatory view of a conductor piece and a holding piece of the embodiment shown in FIG.

FIG. 5 shows a voltage switching device of the embodiment shown in FIG.
Figure when switching to

FIG. 6 is an overall view of a distribution board when the voltage switching device shown in FIG. 1 is used for all branch breakers.

FIG. 7 is a diagram of a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st L-phase bus bar 102 ... screw hole 103 ... 1st L-phase switching screw hole surface part 2 ... N-phase bus bar 202 ... screw hole 203 ... N Phase switching screw hole surface portion 3 ... Second L-phase bus bar 302 ... Screw hole 303 ... Second switching screw hole surface portion 4 ... Branch breaker 5 ... Branch breaker 6 ... Connection bar 601 ... Foot portion 602 ... Oval hole 603 ... Oval hole surface portion 7 ... Switching screw 701 ... Head 702 ... Screw portion 8 ... Switching piece 801 ... Conductor Piece 802 ... Holding piece 8022 ... Engaging claw portion 8021 ... Holding portion 8024 ... Elastic holding portion

Claims (3)

[Claims] 1. A single-phase three-wire type electric circuit consisting of a first L-phase, an N-phase, and a second L-phase, and a two-pole branch breaker, and one terminal of a pole on one side of the breaker The L phase is fixedly connected, and the N pole or the other L phase is selectively connected to the terminal of the other pole to have a plurality of voltage switching devices for changing the supply voltage to the breaker. In the distribution board in which the branch breakers are individually connected to the switching device, the configuration of the portion that selectively connects the N phase or the other L phase to the other pole terminal of the breaker is the other L phase. Is the second L phase, the N phase switching screw hole surface portion including the screw hole provided in the N phase bus bar, and the second L phase switching including the screw hole provided in the second L phase A connection bar consisting of a screw hole surface portion, a foot portion connected to the breaker terminal, and an elongated hole surface portion having an elongated hole. The long hole surface portion of the connection bar, the switching piece interposed between the N-phase screw hole surface portion or the second L-phase switching screw hole surface portion, and slidingly moving in the long hole of the connection bar, the head and the N-phase screw Between the hole surface portion or the second L-phase switching screw hole surface portion, there is a switching screw for stacking and screwing the oblong hole surface portion of the connection bar and the switching piece, and the head side of the switching screw is the operation handle of the breaker. When the other L phase is the first L phase, the first screw hole surface portion is the first L phase instead of the second L phase screw hole surface portion.
The first L-phase switching screw hole surface portion, the N-phase switching screw hole surface portion, and the second L-phase switching screw hole surface portion are arranged in substantially the same plane, and a plurality of them are provided. A single-phase three-wire type distribution board, in which the long axis direction of the long holes of the connection bar of each voltage switching device is arranged parallel to each other. 2. The switching piece is provided with a bent or tubular conductor piece, and an engagement claw surrounding and holding the conductor piece and slidably engaged in the long axis direction of the elongated hole of the connection bar. The single-phase three-wire type distribution board according to claim 1, wherein the single-phase three-wire type distribution panel comprises a holding piece, and the threaded portion of the switching screw penetrates substantially the center of the conductor piece. 3. The single-phase three-wire type distribution board according to claim 2, wherein the holding piece is provided with an elastic holding portion for holding the screw portion of the switching screw.