JPH0716272Y2 - Low-voltage branch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a low-voltage branching device, and more particularly to a low-voltage branching device in which the operability of an opening / closing mechanism provided on the front surface of a switch is improved.

[Conventional technology]

An example of a switch provided with an opening / closing mechanism on the front surface is disclosed in Japanese Patent Laid-Open No. 63-274037. In this switch, a concave portion is formed on the front surface of the switch, and an operation handle is attached to the concave portion to operate the switch so that the three phases are collectively opened and closed. It eliminates the need for installation and lowers the switch.

However, according to the conventional switch, it is necessary to rotate the operation handle in a plane parallel to the front surface of the switch, which causes a disadvantage that the rotation operation is difficult to perform. In addition, since the configuration is adopted in which the movable electrode is moved up and down between the pair of fixed electrodes to open and close, the movable electrode may eccentrically move, and there is a risk that smooth fitting with the fixed electrode may not be possible at the time of insertion. is there.

Therefore, an object of the present invention is to provide a low-pressure branching device having excellent operability, which does not require a rotating operation of an operating handle.

Another object of the present invention is to provide a low-voltage branching device that can achieve a smooth fit between a movable electrode that makes a vertical motion and a fixed electrode that is input without a special guide mechanism.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention fits one of a plurality of tulip contacts to a plurality of power source side fixed electrodes connected to each phase of a main line via bus bars, and the tulip contacts on the outer circumference of the tulip contacts. And a plurality of load-side fixed electrodes are connected to each phase of the branch line so as to face the power-source-side fixed electrode while maintaining a predetermined distance from the power-source-side fixed electrode. , A low-voltage device that is provided with an opening / closing means for collectively opening / closing each phase in each circuit by moving a plurality of tulip contacts in the vertical direction at the same time, and operating the opening / closing means by the longitudinal movement of the operating tool. A branching device is provided.

That is, the low-pressure branch device of the present invention comprises the following means.

(1) Power Supply Side Fixed Electrodes A plurality of fixed electrodes connected to each phase of the main line via bus bars, and a plurality of fixed electrodes are provided according to the number of branch lines.

(2) Load-side fixed electrode With a plurality of fixed electrodes that are connected to each phase of the branch line so as to face the power-side fixed electrode while having a predetermined distance from the power-side fixed electrode described above. is there. As will be described in detail later, this electrode has a diameter larger than that of the power source side fixed electrode, for example.

(3) Tulip contacts A plurality of female contacts that are fitted to one of the plurality of power source side fixed electrodes described above and are slidably arranged in the axial direction on the outer periphery of the power source side fixed electrode. The load-side fixed electrode is fitted to electrically connect each phase of the main line and each phase of the branch line. This is because, for example, the inner diameter at which the load-side fixed electrode fits is larger than the inner diameter at which the power-side fixed electrode fits, and it slides on the outer circumference of the power-side fixed electrode by the opening / closing means described later. When one is fitted to the load-side fixed electrode, the frictional resistance is reduced by making the contact point with the power-side fixed electrode one point.

(4) Opening / Closing Means A plurality of tulip contacts described above are simultaneously moved in the vertical direction to collectively open / close each phase in each circuit. For example, a movable rod that slides in the horizontal direction before and after the storage box. And an "L" -shaped movement transmitting member that transmits the horizontal movement of the movable rod to the tulip contact provided on the outer periphery of the power supply side fixed electrode in place of the vertical movement.
The movable rod has a predetermined number of vertical grooves corresponding to the number of phases. One end of the movement transmitting member is slidably connected to the vertical groove, and a tulip contact is rotatably connected to the other end. Connected. The movement transmitting member has a fulcrum at a predetermined position, and when the movable rod is horizontally moved, the one end and the other end are circularly moved about the fulcrum.

[Action]

In the above structure, when the movable rod is slid horizontally, the plurality of tulip contacts slidably arranged on the outer periphery of the plurality of power source side fixed electrodes connected to the respective phases of the main line by the movement transmitting member. Are simultaneously moved in the vertical direction, and tulip contacts are fitted to a plurality of load-side fixed electrodes connected to each phase of the branch line. By this, it is possible to open and close each phase interlocking in each circuit,
Further, since the fixed electrodes are air-insulated, the insulating property at the time of opening can be improved, and the safety can be improved.

〔Example〕

 Hereinafter, the low-pressure branch device of the present invention will be described in detail.

1 (a) and 1 (b) are distribution towers of the low voltage branching device of the present invention.
The outer box 1 in which the side surface portion, the rear surface portion, and the ceiling portion are assembled by a predetermined construction method is fixed on the base portion 6 fixed on the road (for example, the opening portion of the handhole) by a bolt or the like. The outer box 1 has a door 2 that opens and closes via a hinge (not shown). This door 2 has an auto-lock function that automatically locks the opening of the door 2 only by closing it, and a pillar lock 3 that can be opened and closed only with a special key and the opening of the door 2 at the time of explosion. Explosion-proof lock 4 is attached. On the back side of the door 2, a nameplate 2a on which the company name, manufacturing date, etc. are written, a circuit nameplate 2b on which the circuit configuration and connection status are written, and an operation caution nameplate 2c on which precautions for operation are written are attached. , A tool storage box 2d is provided at the bottom of it to store tools used for construction work,
Further, the operation tool 7 is hung on the upper part. Operating tool 7
As will be described later in detail, it is used when opening and closing the branch opening / closing section housed inside the power distribution tower 10. In addition, a hanging ear 5 is attached to the ceiling portion of the outer box 1, and when the outer box 1 is attached to the base portion 6 or is removed therefrom,
The hanging ear 5 can be used to pull it up. A paper-sticking prevention portion 8 having a plurality of protrusions 8a is formed on the door 2 and a portion surrounded by a chain double-dashed line on the side surface so as not to stick a paper-sticker such as a leaflet.

2 (a) and 2 (b) show the internal structure of the power distribution tower 10 described above with reference to FIGS. 1 (a) and 1 (b). A switch 22 that can open and close the circuit is supported for each circuit. Below the circuit numbers "1" to "10" attached to the switch 22, two main trunk lines introduced from a handhole and Main line terminal covers 23 ₅ , 23 ₆ and branch line terminal covers 23 ₁ , 23 ₂ , 2 to which three-phase four-wire cables (not shown) of eight branch lines are connected
3 ₃ , 23 ₄ , 23 ₇ , 23 ₈ , 23 ₉ , 23 ₁₀ are arranged, and main line terminal covers 23 ₅ , 23 ₆ and branch line terminal covers 23 ₁ , 23 ₂ , 2
3 ₃ , 23 ₄ , 23 ₇ , 23 ₈ , 23 ₉ , 23 ₁₀ are U, V, W and N phases 26 _{a in} the depth direction of the outer box 1 as shown in FIG.
Are arranged in this order. Inverted cup-shaped covers 24 ₁ , 24 ₂ , 24 ₃ , 24 ₄ , 24 ₅ , 24 ₆ , 24 ₇ , 24 ₈ , 24 ₉ , 24 ₁₀ are provided on the upper part of the switch 22 for the main and branch lines U and V. , W phases, which are covered, of which covers 24 ₁ , 24 that are attached to the branch circuit.
₂ , 24 ₃ , 24 ₄ , 24 ₇ , 24 ₈ , 24 ₉ , 24 ₁₀ have built-in power fuses to protect loads (customers) and branch lines from overcurrent due to ground faults. An operating portion 25 for collectively opening and closing each circuit in three phases projects in front of the switch 22, and the operating tool 7 is inserted into the operating portion 25 and pushed horizontally.
Alternatively, by pulling, each circuit can be opened and closed by interlocking with three poles. An N-phase bus bar 26 is provided at the rear of the mounting frame 21. At the bottom, U of the main line and the branch line introduced from a handhole,
Cable support fittings 27 for supporting the V, W and N phases respectively are provided. The circuit configuration of the three-phase four-wire low-voltage branching device configured as described above is shown in FIGS. 3 (a) and 3 (b).
As shown in the single-line connection diagram of (a) in the figure, U, V,
In the W phase, the main lines 30 ₁ and 30 ₂ on the power source side connected by the connection bus bars 29 ₁ and 29 ₂ and the power fuse 31 housed in the above-mentioned covers 24 _{1 to} 24 ₄ and 24 _{6 to} 24 ₁₀ Branch lines 32 ₁ , 32 ₂ , 32 ₃ , 32 ₄ , 32 ₇ , 32 ₈ , 32 ₉ , 32 ₁₀ connected via a switch 22 and a bus bar 33. . In the case of the N phase shown in FIG. 3B, the trunk lines 35 ₁ and 35 ₂ and the branch lines 36 _{1 to} 36 are connected via the N phase bus bar 26 connected to the grounded mounting stay 21 and the connecting portion 34. ₄ , 36 ₇ ~ 36
₁₀ are connected.

FIG. 4 (a) is a low-pressure branching device of FIG. 2 (a),
For example, an enlarged view of the branch circuit of the circuit number “10” is shown, and the inside of the switch 22 and the cover 24 ₁₀ are shown in detail.
That is, the branch line connecting terminal 28 covered by the branch line terminal cover 23 ₁₀ is screwed onto the upper portion of the branch line connecting terminal 28 via the conductor 28a arranged in the switch 22 via the waterproof O-ring 44. Covered
24 in ₁₀ is connected to a connection conductor 41, connection conductor 41 bolt 4 Fuse 31 between the connecting conductors 41b of the substantially L-shaped
Connected via 2. The connection conductor 41b is connected to the load-side fixed electrode 43 arranged inside the switch 22. Switch 22
Is provided with a bus bar 33 connected to the U, V, and W phases of the main line. Above the bus bar 33, a fixed electrode 46 on the power source side is fixed to a fixed electrode 43 on the power source side via a washer 45. It is provided so as to face the load-side fixed electrode 43 with a space of. An opening / closing member 48 having a tulip contact 47 inside is provided slidably in the axial direction on the outer periphery of the power supply side fixed electrode 46, and a movement having a fulcrum 50b at a predetermined position of the opening / closing member 48. The end 50c of the transmission member 50 is rotatably engaged. A movable rod 49 that slides horizontally in the switch 22 is connected to an operating portion 25 that projects to the outside (front) of the switch 22, and a movement transmission member 50 is inserted into a vertical groove 49a formed in the movable rod 49. The other end 50a is slidably supported in the groove. For this reason,
When the movable rod 49 is slid by the operation tool 7, each movement transmission member 50 supported by the movement rod 7 receives the movement force, whereby each movement transmission member 50 rotates clockwise or counterclockwise about the fulcrum 50b. The opening / closing members 49 rotatably engaged with the end portions 50c of the movement transmitting members 50 are vertically moved in the axial direction of the power supply side fixed electrode 46. That is, each opening / closing member 48 is a movable rod.
By sliding movement of 49, each power source side fixed electrode 46 and each load side fixed electrode 43 are opened and closed collectively. FIG. 4B shows the diameter D ₁ of the fixed electrode 46 on the power source side and the inner diameter d of the tip 47a of the tulip contact 47 with which the fixed electrode 46 is fitted.
Shows slightly smaller than the diameter D ₂ of the load side fixed electrode 43,
In addition, it is preferable to determine the inner diameter d of the tulip contact 47 so that d> D ₁ . By doing this, the tulip contact 47 becomes the fixed electrode on the power supply side.
When sliding on the outer circumference of 46, the connection point can be set to one point 47b, so that frictional resistance can be reduced.

The operation of the present invention will be described below.

The electric power supplied from the main line is supplied to each branch circuit via each bus bar 33 connected to each phase of the main line and given to a predetermined load (consumer). At this time, when the load side needs to be cut off due to construction or the like, first, the operation tool 7 hung on the back side of the door 2 is opened by the switch 22.
A predetermined operation is performed by fitting the operation section 25 protruding from the operation section 25. That is, when the operating tool 7 fitted to the operating portion 25 of the predetermined circuit (branch circuit connected to the line for which a power failure occurs) is pulled toward you, the movable rod 49 in the switch 22 faces the front of the power distribution tower 10. It slides, and in conjunction with this, the vertical groove of the movable rod 49
Each movement transmission member 50 whose end 50a is supported by 49a is a fulcrum 50b.
The opening / closing members 48, which rotate counterclockwise around the center and have their ends 50c rotatably engaged, simultaneously descend axially on the outer circumference of each power supply side fixed electrode 46. Therefore, one of the tulip contacts 47 of each opening / closing member 48 is pulled out from each load-side fixed electrode 43, and the electrical connection between each load-side fixed electrode 43 and each power-source-side fixed electrode 46 is opened in a three-pole interlocking manner ( Fig. 5 (a)). Further, when the line that had been out of power due to the completion of construction work etc. is to be connected to the main line, the movable rod 49 slides backward by pushing the operation tool 7 fitted in the operation unit 25 backward. Then, in conjunction with this, each movement transmitting member 50 whose end 50a is supported by the vertical groove 49a of the movable rod 49.
The opening / closing member 48, which is rotated clockwise about the fulcrum 50b and whose end 50c is rotatably engaged, axially rises on the outer periphery of each power supply side fixed electrode 46. Therefore, the upper end portion 47a of each tulip contact 47 is fitted to the load-side fixed electrode 43, and each load-side fixed electrode 43 and each power-source-side fixed electrode 46 are electrically connected (Fig. 5 (b ),
(C)). In this input operation, the distance between the electrodes 43 and 46 is set so that the tip 47a of the tulip contact 47 is located on the outer circumference of the tip of the electrode 46 even when the upper end of the opening / closing member 48 is separated from the lower end of the electrode 43. , No special guide is needed because the guide effect of vertical movement is created.
In this manner, by fitting the operation tool 7 into the operation portion 25 and pushing or pulling the operation tool 7, it is possible to collectively open and close each phase in each circuit. Further, in the above-described embodiments, the three-pole interlocking opening / closing in the branch circuit is shown, but it can be similarly performed in the main line circuit.

[Effect of device]

As described above, according to the low voltage branching device of the present invention, one of the plurality of tulip contacts is fitted to the plurality of power source side fixed electrodes connected to each phase of the main line through the bus bar, and the tulip contacts are connected to the power source side. Along the outer periphery of the fixed electrode, it is slidably arranged in the axial direction, and a plurality of lines are provided in each phase of the branch line so as to face the fixed electrode on the power source side with a predetermined distance from the fixed electrode on the power source side. Since the fixed electrodes on the load side are connected and a plurality of tulip contacts are collectively moved in the vertical direction by the horizontal movement of the operating tool, it is possible to open / close each phase in each circuit. In addition, the inner diameter of the tulip contact on the closing direction side is made larger than the inner diameter on the other side, which makes the closing operation smoother. Furthermore, air insulation between the fixed electrodes improves the insulation when opening and ensures safety. It is possible to improve the property.

[Brief description of drawings]

1 (a) and 1 (b) are explanatory views showing a power distribution tower of a low-voltage branching device of the present invention, FIGS. 2 (a) and 2 (b) are explanatory views showing an internal structure of the power distribution tower, and FIG. 3 ( (a) and (b) are explanatory views showing a single wire connection diagram of the present invention, Fig. 4 (a) is a partially cutaway view showing a side surface of a branch circuit, and Fig. 4 (b) shows a relationship between electrodes and tulip contacts. Explanatory drawing which shows, FIG. 5 (a), (b),
FIG. 6C is an explanatory view showing an operating state of the opening / closing member. Explanation of symbols 1 ... Outer box, 2 ... Door 3 ... Pillar lock, 4 ... Explosion-proof lock 5 ... Suspending ears, 6 ... Foundation part 7 ... Operating tool, 8 ... Paper sticking prevention part 10 ... Power distribution tower, 21 ...... Mounting stay 22 ...... Switch 23 ₁ , 23 ₂ , 23 ₃ , 23 ₄ , 23 ₇ , 23 ₈ , 23 ₉ , 23 ₁₀ ...... Branch line terminal cover 23 ₅ , 23 ₆ ...... Main line terminal cover 24 ₁ , 24 ₂ , 24 ₃ , 24 ₄ , 24 ₅ , 24 ₆ , 24 ₇ , 24 ₈ , 24 ₉ , 24 ₁₀ …… Cover 25 …… Operating part, 26 …… Bus bar 27 …… Cable Supporting fitting 28 ...... Connection terminal, 28a ...... Conductor 29 ₁ , 29 ₂ ...... Connection bus bar 30 ₁ , 30 ₂ ...... Main line 31 ...... Power fuse 32 ₁ , 32 ₂ , 32 ₃ , 32 ₄ , 32 ₇ , 32 ₈ , 32 ₉ , 32 ₁₀ ...... Branch line 33 ...... Bus bar, 34 ...... Connection part 35 ₁ , 35 ₂ ...... Main line (N phase) 36 ₁ , 36 ₂ , 36 ₃ , 36 ₄ , 36 ₇ , 36 ₈ , 36 ₉ , 36 ₁₀ ...... Branch line (N phase) 41 ...... Connection conductor, 41b ...... Connection conductor 42 ...... Bolt 43 ...... Load Side fixed electrode, 44 …… O ring 45 …… Washer, 46 …… Power supply side fixed electrode, 47 …… Opening / closing member 48 …… Tulip contact 49 …… Movable rod, 49a …… Vertical groove 50 …… Movement transmission member, 50a ... end 50b ... fulcrum, 50c ... end

Claims (2)

[Scope of utility model registration request] 1. A low-voltage branching device in which a plurality of branch lines are connected to a trunk line and housed in a storage box, wherein a plurality of power source side fixed electrodes connected to the trunk line via bus bars, and a plurality of power source side fixed electrodes A plurality of load side fixed electrodes connected to the plurality of branch lines so as to face the power source side fixed electrode while having a predetermined space between them, and one is fitted to the plurality of power source side fixed electrodes. With a plurality of tulip contacts that are slidably arranged on the outer periphery in the axial direction, and the other is fitted to the plurality of load side fixed electrodes to electrically connect the trunk line and the plurality of branch lines, The opening / closing means is provided for each of the plurality of branch lines and simultaneously moves the tulip contacts of the respective phases of the respective branch lines in the vertical direction at the same time to open and close the respective phases collectively. Horizontal in front and back A plurality of vertical rods provided at predetermined positions of the movable rod, the movable rod being movable, and a movement transmitting member that transmits the horizontal movement of the movable rod to the tulip contact in place of the vertical movement. One end of the movement transmission member is slidably connected to the groove in the groove, and the other end of the movement transmission member is rotatably connected to the tulip contact. The movement transmission member is rotatably connected based on the horizontal movement of the movable rod. A low-pressure branching device, characterized in that the one end and the other end perform a rotational movement around a fulcrum provided at a predetermined position of the movement transmitting member. 2. The tulip contact has an inner diameter on the loading direction side larger than the inner diameter on the other side, and the load side fixed electrode is larger than the outer diameter of the power source side fixed electrode according to the inner diameter of the tulip contact. The low pressure branching device according to claim 1, having a large outer diameter.